7290 lines
192 KiB
C
7290 lines
192 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* A prototype Bourne shell grammar parser.
|
|
* Intended to follow the original Thompson and Ritchie
|
|
* "small and simple is beautiful" philosophy, which
|
|
* incidentally is a good match to today's BusyBox.
|
|
*
|
|
* Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
|
|
* Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
|
|
*
|
|
* Credits:
|
|
* The parser routines proper are all original material, first
|
|
* written Dec 2000 and Jan 2001 by Larry Doolittle. The
|
|
* execution engine, the builtins, and much of the underlying
|
|
* support has been adapted from busybox-0.49pre's lash, which is
|
|
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
|
|
* written by Erik Andersen <andersen@codepoet.org>. That, in turn,
|
|
* is based in part on ladsh.c, by Michael K. Johnson and Erik W.
|
|
* Troan, which they placed in the public domain. I don't know
|
|
* how much of the Johnson/Troan code has survived the repeated
|
|
* rewrites.
|
|
*
|
|
* Other credits:
|
|
* o_addchr derived from similar w_addchar function in glibc-2.2.
|
|
* parse_redirect, redirect_opt_num, and big chunks of main
|
|
* and many builtins derived from contributions by Erik Andersen.
|
|
* Miscellaneous bugfixes from Matt Kraai.
|
|
*
|
|
* There are two big (and related) architecture differences between
|
|
* this parser and the lash parser. One is that this version is
|
|
* actually designed from the ground up to understand nearly all
|
|
* of the Bourne grammar. The second, consequential change is that
|
|
* the parser and input reader have been turned inside out. Now,
|
|
* the parser is in control, and asks for input as needed. The old
|
|
* way had the input reader in control, and it asked for parsing to
|
|
* take place as needed. The new way makes it much easier to properly
|
|
* handle the recursion implicit in the various substitutions, especially
|
|
* across continuation lines.
|
|
*
|
|
* POSIX syntax not implemented:
|
|
* aliases
|
|
* <(list) and >(list) Process Substitution
|
|
* Tilde Expansion
|
|
*
|
|
* Bash stuff (maybe optionally enable?):
|
|
* &> and >& redirection of stdout+stderr
|
|
* Brace expansion
|
|
* reserved words: [[ ]] function select
|
|
* substrings ${var:1:5}
|
|
*
|
|
* TODOs:
|
|
* grep for "TODO" and fix (some of them are easy)
|
|
* builtins: ulimit
|
|
* follow IFS rules more precisely, including update semantics
|
|
*
|
|
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
|
*/
|
|
#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
|
|
#include <glob.h>
|
|
/* #include <dmalloc.h> */
|
|
#if ENABLE_HUSH_CASE
|
|
# include <fnmatch.h>
|
|
#endif
|
|
#include "math.h"
|
|
#include "match.h"
|
|
#ifndef PIPE_BUF
|
|
# define PIPE_BUF 4096 /* amount of buffering in a pipe */
|
|
#endif
|
|
|
|
|
|
/* Build knobs */
|
|
#define LEAK_HUNTING 0
|
|
#define BUILD_AS_NOMMU 0
|
|
/* Enable/disable sanity checks. Ok to enable in production,
|
|
* only adds a bit of bloat. Set to >1 to get non-production level verbosity.
|
|
* Keeping 1 for now even in released versions.
|
|
*/
|
|
#define HUSH_DEBUG 1
|
|
/* Slightly bigger (+200 bytes), but faster hush.
|
|
* So far it only enables a trick with counting SIGCHLDs and forks,
|
|
* which allows us to do fewer waitpid's.
|
|
* (we can detect a case where neither forks were done nor SIGCHLDs happened
|
|
* and therefore waitpid will return the same result as last time)
|
|
*/
|
|
#define ENABLE_HUSH_FAST 0
|
|
|
|
|
|
#if BUILD_AS_NOMMU
|
|
# undef BB_MMU
|
|
# undef USE_FOR_NOMMU
|
|
# undef USE_FOR_MMU
|
|
# define BB_MMU 0
|
|
# define USE_FOR_NOMMU(...) __VA_ARGS__
|
|
# define USE_FOR_MMU(...)
|
|
#endif
|
|
|
|
#if defined SINGLE_APPLET_MAIN
|
|
/* STANDALONE does not make sense, and won't compile */
|
|
# undef CONFIG_FEATURE_SH_STANDALONE
|
|
# undef ENABLE_FEATURE_SH_STANDALONE
|
|
# undef IF_FEATURE_SH_STANDALONE
|
|
# define IF_FEATURE_SH_STANDALONE(...)
|
|
# define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__
|
|
# define ENABLE_FEATURE_SH_STANDALONE 0
|
|
#endif
|
|
|
|
#if !ENABLE_HUSH_INTERACTIVE
|
|
# undef ENABLE_FEATURE_EDITING
|
|
# define ENABLE_FEATURE_EDITING 0
|
|
# undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
|
# define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
|
|
#endif
|
|
|
|
/* Do we support ANY keywords? */
|
|
#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
# define HAS_KEYWORDS 1
|
|
# define IF_HAS_KEYWORDS(...) __VA_ARGS__
|
|
# define IF_HAS_NO_KEYWORDS(...)
|
|
#else
|
|
# define HAS_KEYWORDS 0
|
|
# define IF_HAS_KEYWORDS(...)
|
|
# define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
|
|
#endif
|
|
|
|
/* If you comment out one of these below, it will be #defined later
|
|
* to perform debug printfs to stderr: */
|
|
#define debug_printf(...) do {} while (0)
|
|
/* Finer-grained debug switches */
|
|
#define debug_printf_parse(...) do {} while (0)
|
|
#define debug_print_tree(a, b) do {} while (0)
|
|
#define debug_printf_exec(...) do {} while (0)
|
|
#define debug_printf_env(...) do {} while (0)
|
|
#define debug_printf_jobs(...) do {} while (0)
|
|
#define debug_printf_expand(...) do {} while (0)
|
|
#define debug_printf_glob(...) do {} while (0)
|
|
#define debug_printf_list(...) do {} while (0)
|
|
#define debug_printf_subst(...) do {} while (0)
|
|
#define debug_printf_clean(...) do {} while (0)
|
|
|
|
#define ERR_PTR ((void*)(long)1)
|
|
|
|
#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
|
|
|
|
#define SPECIAL_VAR_SYMBOL 3
|
|
|
|
struct variable;
|
|
|
|
static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
|
|
|
|
/* This supports saving pointers malloced in vfork child,
|
|
* to be freed in the parent.
|
|
*/
|
|
#if !BB_MMU
|
|
typedef struct nommu_save_t {
|
|
char **new_env;
|
|
struct variable *old_vars;
|
|
char **argv;
|
|
char **argv_from_re_execing;
|
|
} nommu_save_t;
|
|
#endif
|
|
|
|
/* The descrip member of this structure is only used to make
|
|
* debugging output pretty */
|
|
static const struct {
|
|
int mode;
|
|
signed char default_fd;
|
|
char descrip[3];
|
|
} redir_table[] = {
|
|
{ 0, 0, "??" },
|
|
{ O_RDONLY, 0, "<" },
|
|
{ O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
|
|
{ O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
|
|
{ O_RDONLY, 0, "<<" },
|
|
{ O_CREAT|O_RDWR, 1, "<>" },
|
|
/* Should not be needed. Bogus default_fd helps in debugging */
|
|
/* { O_RDONLY, 77, "<<" }, */
|
|
};
|
|
|
|
typedef enum reserved_style {
|
|
RES_NONE = 0,
|
|
#if ENABLE_HUSH_IF
|
|
RES_IF ,
|
|
RES_THEN ,
|
|
RES_ELIF ,
|
|
RES_ELSE ,
|
|
RES_FI ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
RES_FOR ,
|
|
RES_WHILE ,
|
|
RES_UNTIL ,
|
|
RES_DO ,
|
|
RES_DONE ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
RES_IN ,
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
RES_CASE ,
|
|
/* three pseudo-keywords support contrived "case" syntax: */
|
|
RES_CASE_IN, /* "case ... IN", turns into RES_MATCH when IN is observed */
|
|
RES_MATCH , /* "word)" */
|
|
RES_CASE_BODY, /* "this command is inside CASE" */
|
|
RES_ESAC ,
|
|
#endif
|
|
RES_XXXX ,
|
|
RES_SNTX
|
|
} reserved_style;
|
|
|
|
typedef struct o_string {
|
|
char *data;
|
|
int length; /* position where data is appended */
|
|
int maxlen;
|
|
/* Protect newly added chars against globbing
|
|
* (by prepending \ to *, ?, [, \) */
|
|
smallint o_escape;
|
|
smallint o_glob;
|
|
/* At least some part of the string was inside '' or "",
|
|
* possibly empty one: word"", wo''rd etc. */
|
|
smallint o_quoted;
|
|
smallint has_empty_slot;
|
|
smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
|
|
} o_string;
|
|
enum {
|
|
MAYBE_ASSIGNMENT = 0,
|
|
DEFINITELY_ASSIGNMENT = 1,
|
|
NOT_ASSIGNMENT = 2,
|
|
WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */
|
|
};
|
|
/* Used for initialization: o_string foo = NULL_O_STRING; */
|
|
#define NULL_O_STRING { NULL }
|
|
|
|
/* I can almost use ordinary FILE*. Is open_memstream() universally
|
|
* available? Where is it documented? */
|
|
typedef struct in_str {
|
|
const char *p;
|
|
/* eof_flag=1: last char in ->p is really an EOF */
|
|
char eof_flag; /* meaningless if ->p == NULL */
|
|
char peek_buf[2];
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
smallint promptme;
|
|
smallint promptmode; /* 0: PS1, 1: PS2 */
|
|
#endif
|
|
FILE *file;
|
|
int (*get) (struct in_str *);
|
|
int (*peek) (struct in_str *);
|
|
} in_str;
|
|
#define i_getch(input) ((input)->get(input))
|
|
#define i_peek(input) ((input)->peek(input))
|
|
|
|
struct redir_struct {
|
|
struct redir_struct *next;
|
|
char *rd_filename; /* filename */
|
|
int rd_fd; /* fd to redirect */
|
|
/* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
|
|
int rd_dup;
|
|
smallint rd_type; /* (enum redir_type) */
|
|
/* note: for heredocs, rd_filename contains heredoc delimiter,
|
|
* and subsequently heredoc itself; and rd_dup is a bitmask:
|
|
* 1: do we need to trim leading tabs?
|
|
* 2: is heredoc quoted (<<'delim' syntax) ?
|
|
*/
|
|
};
|
|
typedef enum redir_type {
|
|
REDIRECT_INVALID = 0,
|
|
REDIRECT_INPUT = 1,
|
|
REDIRECT_OVERWRITE = 2,
|
|
REDIRECT_APPEND = 3,
|
|
REDIRECT_HEREDOC = 4,
|
|
REDIRECT_IO = 5,
|
|
REDIRECT_HEREDOC2 = 6, /* REDIRECT_HEREDOC after heredoc is loaded */
|
|
|
|
REDIRFD_CLOSE = -3,
|
|
REDIRFD_SYNTAX_ERR = -2,
|
|
REDIRFD_TO_FILE = -1,
|
|
/* otherwise, rd_fd is redirected to rd_dup */
|
|
|
|
HEREDOC_SKIPTABS = 1,
|
|
HEREDOC_QUOTED = 2,
|
|
} redir_type;
|
|
|
|
|
|
struct command {
|
|
pid_t pid; /* 0 if exited */
|
|
int assignment_cnt; /* how many argv[i] are assignments? */
|
|
smallint is_stopped; /* is the command currently running? */
|
|
smallint grp_type; /* GRP_xxx */
|
|
#define GRP_NORMAL 0
|
|
#define GRP_SUBSHELL 1
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
# define GRP_FUNCTION 2
|
|
#endif
|
|
/* if non-NULL, this "command" is { list }, ( list ), or a compound statement */
|
|
struct pipe *group;
|
|
#if !BB_MMU
|
|
char *group_as_string;
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function *child_func;
|
|
/* This field is used to prevent a bug here:
|
|
* while...do f1() {a;}; f1; f1 {b;}; f1; done
|
|
* When we execute "f1() {a;}" cmd, we create new function and clear
|
|
* cmd->group, cmd->group_as_string, cmd->argv[0].
|
|
* when we execute "f1 {b;}", we notice that f1 exists,
|
|
* and that it's "parent cmd" struct is still "alive",
|
|
* we put those fields back into cmd->xxx
|
|
* (struct function has ->parent_cmd ptr to facilitate that).
|
|
* When we loop back, we can execute "f1() {a;}" again and set f1 correctly.
|
|
* Without this trick, loop would execute a;b;b;b;...
|
|
* instead of correct sequence a;b;a;b;...
|
|
* When command is freed, it severs the link
|
|
* (sets ->child_func->parent_cmd to NULL).
|
|
*/
|
|
#endif
|
|
char **argv; /* command name and arguments */
|
|
/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
|
|
* and on execution these are substituted with their values.
|
|
* Substitution can make _several_ words out of one argv[n]!
|
|
* Example: argv[0]=='.^C*^C.' here: echo .$*.
|
|
* References of the form ^C`cmd arg^C are `cmd arg` substitutions.
|
|
*/
|
|
struct redir_struct *redirects; /* I/O redirections */
|
|
};
|
|
/* Is there anything in this command at all? */
|
|
#define IS_NULL_CMD(cmd) \
|
|
(!(cmd)->group && !(cmd)->argv && !(cmd)->redirects)
|
|
|
|
|
|
struct pipe {
|
|
struct pipe *next;
|
|
int num_cmds; /* total number of commands in pipe */
|
|
int alive_cmds; /* number of commands running (not exited) */
|
|
int stopped_cmds; /* number of commands alive, but stopped */
|
|
#if ENABLE_HUSH_JOB
|
|
int jobid; /* job number */
|
|
pid_t pgrp; /* process group ID for the job */
|
|
char *cmdtext; /* name of job */
|
|
#endif
|
|
struct command *cmds; /* array of commands in pipe */
|
|
smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
|
|
IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
|
|
IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
|
|
};
|
|
typedef enum pipe_style {
|
|
PIPE_SEQ = 1,
|
|
PIPE_AND = 2,
|
|
PIPE_OR = 3,
|
|
PIPE_BG = 4,
|
|
} pipe_style;
|
|
/* Is there anything in this pipe at all? */
|
|
#define IS_NULL_PIPE(pi) \
|
|
((pi)->num_cmds == 0 IF_HAS_KEYWORDS( && (pi)->res_word == RES_NONE))
|
|
|
|
/* This holds pointers to the various results of parsing */
|
|
struct parse_context {
|
|
/* linked list of pipes */
|
|
struct pipe *list_head;
|
|
/* last pipe (being constructed right now) */
|
|
struct pipe *pipe;
|
|
/* last command in pipe (being constructed right now) */
|
|
struct command *command;
|
|
/* last redirect in command->redirects list */
|
|
struct redir_struct *pending_redirect;
|
|
#if !BB_MMU
|
|
o_string as_string;
|
|
#endif
|
|
#if HAS_KEYWORDS
|
|
smallint ctx_res_w;
|
|
smallint ctx_inverted; /* "! cmd | cmd" */
|
|
#if ENABLE_HUSH_CASE
|
|
smallint ctx_dsemicolon; /* ";;" seen */
|
|
#endif
|
|
/* bitmask of FLAG_xxx, for figuring out valid reserved words */
|
|
int old_flag;
|
|
/* group we are enclosed in:
|
|
* example: "if pipe1; pipe2; then pipe3; fi"
|
|
* when we see "if" or "then", we malloc and copy current context,
|
|
* and make ->stack point to it. then we parse pipeN.
|
|
* when closing "then" / fi" / whatever is found,
|
|
* we move list_head into ->stack->command->group,
|
|
* copy ->stack into current context, and delete ->stack.
|
|
* (parsing of { list } and ( list ) doesn't use this method)
|
|
*/
|
|
struct parse_context *stack;
|
|
#endif
|
|
};
|
|
|
|
/* On program start, environ points to initial environment.
|
|
* putenv adds new pointers into it, unsetenv removes them.
|
|
* Neither of these (de)allocates the strings.
|
|
* setenv allocates new strings in malloc space and does putenv,
|
|
* and thus setenv is unusable (leaky) for shell's purposes */
|
|
#define setenv(...) setenv_is_leaky_dont_use()
|
|
struct variable {
|
|
struct variable *next;
|
|
char *varstr; /* points to "name=" portion */
|
|
int max_len; /* if > 0, name is part of initial env; else name is malloced */
|
|
smallint flg_export; /* putenv should be done on this var */
|
|
smallint flg_read_only;
|
|
};
|
|
|
|
enum {
|
|
BC_BREAK = 1,
|
|
BC_CONTINUE = 2,
|
|
};
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function {
|
|
struct function *next;
|
|
char *name;
|
|
struct command *parent_cmd;
|
|
struct pipe *body;
|
|
#if !BB_MMU
|
|
char *body_as_string;
|
|
#endif
|
|
};
|
|
#endif
|
|
|
|
|
|
/* "Globals" within this file */
|
|
/* Sorted roughly by size (smaller offsets == smaller code) */
|
|
struct globals {
|
|
/* interactive_fd != 0 means we are an interactive shell.
|
|
* If we are, then saved_tty_pgrp can also be != 0, meaning
|
|
* that controlling tty is available. With saved_tty_pgrp == 0,
|
|
* job control still works, but terminal signals
|
|
* (^C, ^Z, ^Y, ^\) won't work at all, and background
|
|
* process groups can only be created with "cmd &".
|
|
* With saved_tty_pgrp != 0, hush will use tcsetpgrp()
|
|
* to give tty to the foreground process group,
|
|
* and will take it back when the group is stopped (^Z)
|
|
* or killed (^C).
|
|
*/
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
/* 'interactive_fd' is a fd# open to ctty, if we have one
|
|
* _AND_ if we decided to act interactively */
|
|
int interactive_fd;
|
|
const char *PS1;
|
|
const char *PS2;
|
|
# define G_interactive_fd (G.interactive_fd)
|
|
#else
|
|
# define G_interactive_fd 0
|
|
#endif
|
|
#if ENABLE_FEATURE_EDITING
|
|
line_input_t *line_input_state;
|
|
#endif
|
|
pid_t root_pid;
|
|
pid_t last_bg_pid;
|
|
#if ENABLE_HUSH_JOB
|
|
int run_list_level;
|
|
int last_jobid;
|
|
pid_t saved_tty_pgrp;
|
|
struct pipe *job_list;
|
|
# define G_saved_tty_pgrp (G.saved_tty_pgrp)
|
|
#else
|
|
# define G_saved_tty_pgrp 0
|
|
#endif
|
|
smallint flag_SIGINT;
|
|
#if ENABLE_HUSH_LOOPS
|
|
smallint flag_break_continue;
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
/* 0: outside of a function (or sourced file)
|
|
* -1: inside of a function, ok to use return builtin
|
|
* 1: return is invoked, skip all till end of func
|
|
*/
|
|
smallint flag_return_in_progress;
|
|
#endif
|
|
smallint fake_mode;
|
|
smallint exiting; /* used to prevent EXIT trap recursion */
|
|
/* These four support $?, $#, and $1 */
|
|
smalluint last_exitcode;
|
|
/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
|
|
smalluint global_args_malloced;
|
|
/* how many non-NULL argv's we have. NB: $# + 1 */
|
|
int global_argc;
|
|
char **global_argv;
|
|
#if !BB_MMU
|
|
char *argv0_for_re_execing;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
unsigned depth_break_continue;
|
|
unsigned depth_of_loop;
|
|
#endif
|
|
const char *ifs;
|
|
const char *cwd;
|
|
struct variable *top_var; /* = &G.shell_ver (set in main()) */
|
|
struct variable shell_ver;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function *top_func;
|
|
#endif
|
|
/* Signal and trap handling */
|
|
#if ENABLE_HUSH_FAST
|
|
unsigned count_SIGCHLD;
|
|
unsigned handled_SIGCHLD;
|
|
smallint we_have_children;
|
|
#endif
|
|
/* which signals have non-DFL handler (even with no traps set)? */
|
|
unsigned non_DFL_mask;
|
|
char **traps; /* char *traps[NSIG] */
|
|
sigset_t blocked_set;
|
|
sigset_t inherited_set;
|
|
#if HUSH_DEBUG
|
|
unsigned long memleak_value;
|
|
int debug_indent;
|
|
#endif
|
|
char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
|
|
};
|
|
#define G (*ptr_to_globals)
|
|
/* Not #defining name to G.name - this quickly gets unwieldy
|
|
* (too many defines). Also, I actually prefer to see when a variable
|
|
* is global, thus "G." prefix is a useful hint */
|
|
#define INIT_G() do { \
|
|
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
|
|
} while (0)
|
|
|
|
|
|
/* Function prototypes for builtins */
|
|
static int builtin_cd(char **argv);
|
|
static int builtin_echo(char **argv);
|
|
static int builtin_eval(char **argv);
|
|
static int builtin_exec(char **argv);
|
|
static int builtin_exit(char **argv);
|
|
static int builtin_export(char **argv);
|
|
#if ENABLE_HUSH_JOB
|
|
static int builtin_fg_bg(char **argv);
|
|
static int builtin_jobs(char **argv);
|
|
#endif
|
|
#if ENABLE_HUSH_HELP
|
|
static int builtin_help(char **argv);
|
|
#endif
|
|
#if HUSH_DEBUG
|
|
static int builtin_memleak(char **argv);
|
|
#endif
|
|
static int builtin_pwd(char **argv);
|
|
static int builtin_read(char **argv);
|
|
static int builtin_set(char **argv);
|
|
static int builtin_shift(char **argv);
|
|
static int builtin_source(char **argv);
|
|
static int builtin_test(char **argv);
|
|
static int builtin_trap(char **argv);
|
|
static int builtin_type(char **argv);
|
|
static int builtin_true(char **argv);
|
|
static int builtin_umask(char **argv);
|
|
static int builtin_unset(char **argv);
|
|
static int builtin_wait(char **argv);
|
|
#if ENABLE_HUSH_LOOPS
|
|
static int builtin_break(char **argv);
|
|
static int builtin_continue(char **argv);
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static int builtin_return(char **argv);
|
|
#endif
|
|
|
|
/* Table of built-in functions. They can be forked or not, depending on
|
|
* context: within pipes, they fork. As simple commands, they do not.
|
|
* When used in non-forking context, they can change global variables
|
|
* in the parent shell process. If forked, of course they cannot.
|
|
* For example, 'unset foo | whatever' will parse and run, but foo will
|
|
* still be set at the end. */
|
|
struct built_in_command {
|
|
const char *cmd;
|
|
int (*function)(char **argv);
|
|
#if ENABLE_HUSH_HELP
|
|
const char *descr;
|
|
# define BLTIN(cmd, func, help) { cmd, func, help }
|
|
#else
|
|
# define BLTIN(cmd, func, help) { cmd, func }
|
|
#endif
|
|
};
|
|
|
|
/* For now, echo and test are unconditionally enabled.
|
|
* Maybe make it configurable? */
|
|
static const struct built_in_command bltins[] = {
|
|
BLTIN("." , builtin_source , "Run commands in a file"),
|
|
BLTIN(":" , builtin_true , "No-op"),
|
|
BLTIN("[" , builtin_test , "Test condition"),
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
BLTIN("break" , builtin_break , "Exit from a loop"),
|
|
#endif
|
|
BLTIN("cd" , builtin_cd , "Change directory"),
|
|
#if ENABLE_HUSH_LOOPS
|
|
BLTIN("continue", builtin_continue, "Start new loop iteration"),
|
|
#endif
|
|
BLTIN("echo" , builtin_echo , "Write to stdout"),
|
|
BLTIN("eval" , builtin_eval , "Construct and run shell command"),
|
|
BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
|
|
BLTIN("exit" , builtin_exit , "Exit"),
|
|
BLTIN("export" , builtin_export , "Set environment variable"),
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
|
|
#endif
|
|
#if ENABLE_HUSH_HELP
|
|
BLTIN("help" , builtin_help , "List shell built-in commands"),
|
|
#endif
|
|
#if ENABLE_HUSH_JOB
|
|
BLTIN("jobs" , builtin_jobs , "List active jobs"),
|
|
#endif
|
|
#if HUSH_DEBUG
|
|
BLTIN("memleak" , builtin_memleak , "Debug tool"),
|
|
#endif
|
|
BLTIN("pwd" , builtin_pwd , "Print current directory"),
|
|
BLTIN("read" , builtin_read , "Input environment variable"),
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
BLTIN("return" , builtin_return , "Return from a function"),
|
|
#endif
|
|
BLTIN("set" , builtin_set , "Set/unset shell local variables"),
|
|
BLTIN("shift" , builtin_shift , "Shift positional parameters"),
|
|
BLTIN("test" , builtin_test , "Test condition"),
|
|
BLTIN("trap" , builtin_trap , "Trap signals"),
|
|
BLTIN("type" , builtin_type , "Write a description of command type"),
|
|
// BLTIN("ulimit" , builtin_ulimit , "Control resource limits"),
|
|
BLTIN("umask" , builtin_umask , "Set file creation mask"),
|
|
BLTIN("unset" , builtin_unset , "Unset environment variable"),
|
|
BLTIN("wait" , builtin_wait , "Wait for process"),
|
|
};
|
|
|
|
|
|
/* Debug printouts.
|
|
*/
|
|
#if HUSH_DEBUG
|
|
/* prevent disasters with G.debug_indent < 0 */
|
|
# define indent() fprintf(stderr, "%*s", (G.debug_indent * 2) & 0xff, "")
|
|
# define debug_enter() (G.debug_indent++)
|
|
# define debug_leave() (G.debug_indent--)
|
|
#else
|
|
# define indent() ((void)0)
|
|
# define debug_enter() ((void)0)
|
|
# define debug_leave() ((void)0)
|
|
#endif
|
|
|
|
#ifndef debug_printf
|
|
# define debug_printf(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_parse
|
|
# define debug_printf_parse(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_exec
|
|
#define debug_printf_exec(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_env
|
|
# define debug_printf_env(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_jobs
|
|
# define debug_printf_jobs(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
# define DEBUG_JOBS 1
|
|
#else
|
|
# define DEBUG_JOBS 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_expand
|
|
# define debug_printf_expand(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
# define DEBUG_EXPAND 1
|
|
#else
|
|
# define DEBUG_EXPAND 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_glob
|
|
# define debug_printf_glob(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
# define DEBUG_GLOB 1
|
|
#else
|
|
# define DEBUG_GLOB 0
|
|
#endif
|
|
|
|
#ifndef debug_printf_list
|
|
# define debug_printf_list(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_subst
|
|
# define debug_printf_subst(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
#endif
|
|
|
|
#ifndef debug_printf_clean
|
|
# define debug_printf_clean(...) (indent(), fprintf(stderr, __VA_ARGS__))
|
|
# define DEBUG_CLEAN 1
|
|
#else
|
|
# define DEBUG_CLEAN 0
|
|
#endif
|
|
|
|
#if DEBUG_EXPAND
|
|
static void debug_print_strings(const char *prefix, char **vv)
|
|
{
|
|
indent();
|
|
fprintf(stderr, "%s:\n", prefix);
|
|
while (*vv)
|
|
fprintf(stderr, " '%s'\n", *vv++);
|
|
}
|
|
#else
|
|
# define debug_print_strings(prefix, vv) ((void)0)
|
|
#endif
|
|
|
|
|
|
/* Leak hunting. Use hush_leaktool.sh for post-processing.
|
|
*/
|
|
#if LEAK_HUNTING
|
|
static void *xxmalloc(int lineno, size_t size)
|
|
{
|
|
void *ptr = xmalloc((size + 0xff) & ~0xff);
|
|
fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static void *xxrealloc(int lineno, void *ptr, size_t size)
|
|
{
|
|
ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
|
|
fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static char *xxstrdup(int lineno, const char *str)
|
|
{
|
|
char *ptr = xstrdup(str);
|
|
fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
static void xxfree(void *ptr)
|
|
{
|
|
fdprintf(2, "free %p\n", ptr);
|
|
free(ptr);
|
|
}
|
|
#define xmalloc(s) xxmalloc(__LINE__, s)
|
|
#define xrealloc(p, s) xxrealloc(__LINE__, p, s)
|
|
#define xstrdup(s) xxstrdup(__LINE__, s)
|
|
#define free(p) xxfree(p)
|
|
#endif
|
|
|
|
|
|
/* Syntax and runtime errors. They always abort scripts.
|
|
* In interactive use they usually discard unparsed and/or unexecuted commands
|
|
* and return to the prompt.
|
|
* HUSH_DEBUG >= 2 prints line number in this file where it was detected.
|
|
*/
|
|
#if HUSH_DEBUG < 2
|
|
# define die_if_script(lineno, fmt...) die_if_script(fmt)
|
|
# define syntax_error(lineno, msg) syntax_error(msg)
|
|
# define syntax_error_at(lineno, msg) syntax_error_at(msg)
|
|
# define syntax_error_unterm_ch(lineno, ch) syntax_error_unterm_ch(ch)
|
|
# define syntax_error_unterm_str(lineno, s) syntax_error_unterm_str(s)
|
|
# define syntax_error_unexpected_ch(lineno, ch) syntax_error_unexpected_ch(ch)
|
|
#endif
|
|
|
|
static void die_if_script(unsigned lineno, const char *fmt, ...)
|
|
{
|
|
va_list p;
|
|
|
|
#if HUSH_DEBUG >= 2
|
|
bb_error_msg("hush.c:%u", lineno);
|
|
#endif
|
|
va_start(p, fmt);
|
|
bb_verror_msg(fmt, p, NULL);
|
|
va_end(p);
|
|
if (!G_interactive_fd)
|
|
xfunc_die();
|
|
}
|
|
|
|
static void syntax_error(unsigned lineno, const char *msg)
|
|
{
|
|
if (msg)
|
|
die_if_script(lineno, "syntax error: %s", msg);
|
|
else
|
|
die_if_script(lineno, "syntax error", NULL);
|
|
}
|
|
|
|
static void syntax_error_at(unsigned lineno, const char *msg)
|
|
{
|
|
die_if_script(lineno, "syntax error at '%s'", msg);
|
|
}
|
|
|
|
/* It so happens that all such cases are totally fatal
|
|
* even if shell is interactive: EOF while looking for closing
|
|
* delimiter. There is nowhere to read stuff from after that,
|
|
* it's EOF! The only choice is to terminate.
|
|
*/
|
|
static void syntax_error_unterm_ch(unsigned lineno, char ch) NORETURN;
|
|
static void syntax_error_unterm_ch(unsigned lineno, char ch)
|
|
{
|
|
char msg[2];
|
|
msg[0] = ch;
|
|
msg[1] = '\0';
|
|
die_if_script(lineno, "syntax error: unterminated %s", msg);
|
|
xfunc_die();
|
|
}
|
|
|
|
static void syntax_error_unterm_str(unsigned lineno, const char *s)
|
|
{
|
|
die_if_script(lineno, "syntax error: unterminated %s", s);
|
|
}
|
|
|
|
static void syntax_error_unexpected_ch(unsigned lineno, int ch)
|
|
{
|
|
char msg[2];
|
|
msg[0] = ch;
|
|
msg[1] = '\0';
|
|
die_if_script(lineno, "syntax error: unexpected %s", ch == EOF ? "EOF" : msg);
|
|
}
|
|
|
|
#if HUSH_DEBUG < 2
|
|
# undef die_if_script
|
|
# undef syntax_error
|
|
# undef syntax_error_at
|
|
# undef syntax_error_unterm_ch
|
|
# undef syntax_error_unterm_str
|
|
# undef syntax_error_unexpected_ch
|
|
#else
|
|
# define die_if_script(fmt...) die_if_script(__LINE__, fmt)
|
|
# define syntax_error(msg) syntax_error(__LINE__, msg)
|
|
# define syntax_error_at(msg) syntax_error_at(__LINE__, msg)
|
|
# define syntax_error_unterm_ch(ch) syntax_error_unterm_ch(__LINE__, ch)
|
|
# define syntax_error_unterm_str(s) syntax_error_unterm_str(__LINE__, s)
|
|
# define syntax_error_unexpected_ch(ch) syntax_error_unexpected_ch(__LINE__, ch)
|
|
#endif
|
|
|
|
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
static void cmdedit_update_prompt(void);
|
|
#else
|
|
# define cmdedit_update_prompt() ((void)0)
|
|
#endif
|
|
|
|
|
|
/* Utility functions
|
|
*/
|
|
static int glob_needed(const char *s)
|
|
{
|
|
while (*s) {
|
|
if (*s == '\\')
|
|
s++;
|
|
if (*s == '*' || *s == '[' || *s == '?')
|
|
return 1;
|
|
s++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int is_well_formed_var_name(const char *s, char terminator)
|
|
{
|
|
if (!s || !(isalpha(*s) || *s == '_'))
|
|
return 0;
|
|
s++;
|
|
while (isalnum(*s) || *s == '_')
|
|
s++;
|
|
return *s == terminator;
|
|
}
|
|
|
|
/* Replace each \x with x in place, return ptr past NUL. */
|
|
static char *unbackslash(char *src)
|
|
{
|
|
char *dst = src;
|
|
while (1) {
|
|
if (*src == '\\')
|
|
src++;
|
|
if ((*dst++ = *src++) == '\0')
|
|
break;
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
|
|
{
|
|
int i;
|
|
unsigned count1;
|
|
unsigned count2;
|
|
char **v;
|
|
|
|
v = strings;
|
|
count1 = 0;
|
|
if (v) {
|
|
while (*v) {
|
|
count1++;
|
|
v++;
|
|
}
|
|
}
|
|
count2 = 0;
|
|
v = add;
|
|
while (*v) {
|
|
count2++;
|
|
v++;
|
|
}
|
|
v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
|
|
v[count1 + count2] = NULL;
|
|
i = count2;
|
|
while (--i >= 0)
|
|
v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
|
|
return v;
|
|
}
|
|
#if LEAK_HUNTING
|
|
static char **xx_add_strings_to_strings(int lineno, char **strings, char **add, int need_to_dup)
|
|
{
|
|
char **ptr = add_strings_to_strings(strings, add, need_to_dup);
|
|
fdprintf(2, "line %d: add_strings_to_strings %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
#define add_strings_to_strings(strings, add, need_to_dup) \
|
|
xx_add_strings_to_strings(__LINE__, strings, add, need_to_dup)
|
|
#endif
|
|
|
|
/* Note: takes ownership of "add" ptr (it is not strdup'ed) */
|
|
static char **add_string_to_strings(char **strings, char *add)
|
|
{
|
|
char *v[2];
|
|
v[0] = add;
|
|
v[1] = NULL;
|
|
return add_strings_to_strings(strings, v, /*dup:*/ 0);
|
|
}
|
|
#if LEAK_HUNTING
|
|
static char **xx_add_string_to_strings(int lineno, char **strings, char *add)
|
|
{
|
|
char **ptr = add_string_to_strings(strings, add);
|
|
fdprintf(2, "line %d: add_string_to_strings %p\n", lineno, ptr);
|
|
return ptr;
|
|
}
|
|
#define add_string_to_strings(strings, add) \
|
|
xx_add_string_to_strings(__LINE__, strings, add)
|
|
#endif
|
|
|
|
static void free_strings(char **strings)
|
|
{
|
|
char **v;
|
|
|
|
if (!strings)
|
|
return;
|
|
v = strings;
|
|
while (*v) {
|
|
free(*v);
|
|
v++;
|
|
}
|
|
free(strings);
|
|
}
|
|
|
|
|
|
/* Helpers for setting new $n and restoring them back
|
|
*/
|
|
typedef struct save_arg_t {
|
|
char *sv_argv0;
|
|
char **sv_g_argv;
|
|
int sv_g_argc;
|
|
smallint sv_g_malloced;
|
|
} save_arg_t;
|
|
|
|
static void save_and_replace_G_args(save_arg_t *sv, char **argv)
|
|
{
|
|
int n;
|
|
|
|
sv->sv_argv0 = argv[0];
|
|
sv->sv_g_argv = G.global_argv;
|
|
sv->sv_g_argc = G.global_argc;
|
|
sv->sv_g_malloced = G.global_args_malloced;
|
|
|
|
argv[0] = G.global_argv[0]; /* retain $0 */
|
|
G.global_argv = argv;
|
|
G.global_args_malloced = 0;
|
|
|
|
n = 1;
|
|
while (*++argv)
|
|
n++;
|
|
G.global_argc = n;
|
|
}
|
|
|
|
static void restore_G_args(save_arg_t *sv, char **argv)
|
|
{
|
|
char **pp;
|
|
|
|
if (G.global_args_malloced) {
|
|
/* someone ran "set -- arg1 arg2 ...", undo */
|
|
pp = G.global_argv;
|
|
while (*++pp) /* note: does not free $0 */
|
|
free(*pp);
|
|
free(G.global_argv);
|
|
}
|
|
argv[0] = sv->sv_argv0;
|
|
G.global_argv = sv->sv_g_argv;
|
|
G.global_argc = sv->sv_g_argc;
|
|
G.global_args_malloced = sv->sv_g_malloced;
|
|
}
|
|
|
|
|
|
/* Basic theory of signal handling in shell
|
|
* ========================================
|
|
* This does not describe what hush does, rather, it is current understanding
|
|
* what it _should_ do. If it doesn't, it's a bug.
|
|
* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
|
|
*
|
|
* Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
|
|
* is finished or backgrounded. It is the same in interactive and
|
|
* non-interactive shells, and is the same regardless of whether
|
|
* a user trap handler is installed or a shell special one is in effect.
|
|
* ^C or ^Z from keyboard seem to execute "at once" because it usually
|
|
* backgrounds (i.e. stops) or kills all members of currently running
|
|
* pipe.
|
|
*
|
|
* Wait builtin in interruptible by signals for which user trap is set
|
|
* or by SIGINT in interactive shell.
|
|
*
|
|
* Trap handlers will execute even within trap handlers. (right?)
|
|
*
|
|
* User trap handlers are forgotten when subshell ("(cmd)") is entered.
|
|
*
|
|
* If job control is off, backgrounded commands ("cmd &")
|
|
* have SIGINT, SIGQUIT set to SIG_IGN.
|
|
*
|
|
* Commands which are run in command substitution ("`cmd`")
|
|
* have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
|
|
*
|
|
* Ordinary commands have signals set to SIG_IGN/DFL as inherited
|
|
* by the shell from its parent.
|
|
*
|
|
* Signals which differ from SIG_DFL action
|
|
* (note: child (i.e., [v]forked) shell is not an interactive shell):
|
|
*
|
|
* SIGQUIT: ignore
|
|
* SIGTERM (interactive): ignore
|
|
* SIGHUP (interactive):
|
|
* send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
|
|
* SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
|
|
* Note that ^Z is handled not by trapping SIGTSTP, but by seeing
|
|
* that all pipe members are stopped. Try this in bash:
|
|
* while :; do :; done - ^Z does not background it
|
|
* (while :; do :; done) - ^Z backgrounds it
|
|
* SIGINT (interactive): wait for last pipe, ignore the rest
|
|
* of the command line, show prompt. NB: ^C does not send SIGINT
|
|
* to interactive shell while shell is waiting for a pipe,
|
|
* since shell is bg'ed (is not in foreground process group).
|
|
* Example 1: this waits 5 sec, but does not execute ls:
|
|
* "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
|
|
* Example 2: this does not wait and does not execute ls:
|
|
* "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
|
|
* Example 3: this does not wait 5 sec, but executes ls:
|
|
* "sleep 5; ls -l" + press ^C
|
|
*
|
|
* (What happens to signals which are IGN on shell start?)
|
|
* (What happens with signal mask on shell start?)
|
|
*
|
|
* Implementation in hush
|
|
* ======================
|
|
* We use in-kernel pending signal mask to determine which signals were sent.
|
|
* We block all signals which we don't want to take action immediately,
|
|
* i.e. we block all signals which need to have special handling as described
|
|
* above, and all signals which have traps set.
|
|
* After each pipe execution, we extract any pending signals via sigtimedwait()
|
|
* and act on them.
|
|
*
|
|
* unsigned non_DFL_mask: a mask of such "special" signals
|
|
* sigset_t blocked_set: current blocked signal set
|
|
*
|
|
* "trap - SIGxxx":
|
|
* clear bit in blocked_set unless it is also in non_DFL_mask
|
|
* "trap 'cmd' SIGxxx":
|
|
* set bit in blocked_set (even if 'cmd' is '')
|
|
* after [v]fork, if we plan to be a shell:
|
|
* unblock signals with special interactive handling
|
|
* (child shell is not interactive),
|
|
* unset all traps (note: regardless of child shell's type - {}, (), etc)
|
|
* after [v]fork, if we plan to exec:
|
|
* POSIX says pending signal mask is cleared in child - no need to clear it.
|
|
* Restore blocked signal set to one inherited by shell just prior to exec.
|
|
*
|
|
* Note: as a result, we do not use signal handlers much. The only uses
|
|
* are to count SIGCHLDs
|
|
* and to restore tty pgrp on signal-induced exit.
|
|
*/
|
|
enum {
|
|
SPECIAL_INTERACTIVE_SIGS = 0
|
|
| (1 << SIGTERM)
|
|
| (1 << SIGINT)
|
|
| (1 << SIGHUP)
|
|
,
|
|
SPECIAL_JOB_SIGS = 0
|
|
#if ENABLE_HUSH_JOB
|
|
| (1 << SIGTTIN)
|
|
| (1 << SIGTTOU)
|
|
| (1 << SIGTSTP)
|
|
#endif
|
|
};
|
|
|
|
#if ENABLE_HUSH_FAST
|
|
static void SIGCHLD_handler(int sig UNUSED_PARAM)
|
|
{
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] SIGCHLD_handler: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
|
|
/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
|
|
#define disable_restore_tty_pgrp_on_exit() (die_sleep = 0)
|
|
/* After [v]fork, in parent: restore tty pgrp on xfunc death */
|
|
#define enable_restore_tty_pgrp_on_exit() (die_sleep = -1)
|
|
|
|
/* Restores tty foreground process group, and exits.
|
|
* May be called as signal handler for fatal signal
|
|
* (will resend signal to itself, producing correct exit state)
|
|
* or called directly with -EXITCODE.
|
|
* We also call it if xfunc is exiting. */
|
|
static void sigexit(int sig) NORETURN;
|
|
static void sigexit(int sig)
|
|
{
|
|
/* Disable all signals: job control, SIGPIPE, etc. */
|
|
sigprocmask_allsigs(SIG_BLOCK);
|
|
|
|
/* Careful: we can end up here after [v]fork. Do not restore
|
|
* tty pgrp then, only top-level shell process does that */
|
|
if (G_saved_tty_pgrp && getpid() == G.root_pid)
|
|
tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp);
|
|
|
|
/* Not a signal, just exit */
|
|
if (sig <= 0)
|
|
_exit(- sig);
|
|
|
|
kill_myself_with_sig(sig); /* does not return */
|
|
}
|
|
#else
|
|
|
|
#define disable_restore_tty_pgrp_on_exit() ((void)0)
|
|
#define enable_restore_tty_pgrp_on_exit() ((void)0)
|
|
|
|
#endif
|
|
|
|
/* Restores tty foreground process group, and exits. */
|
|
static void hush_exit(int exitcode) NORETURN;
|
|
static void hush_exit(int exitcode)
|
|
{
|
|
if (G.exiting <= 0 && G.traps && G.traps[0] && G.traps[0][0]) {
|
|
/* Prevent recursion:
|
|
* trap "echo Hi; exit" EXIT; exit
|
|
*/
|
|
char *argv[] = { NULL, G.traps[0], NULL };
|
|
G.traps[0] = NULL;
|
|
G.exiting = 1;
|
|
builtin_eval(argv);
|
|
free(argv[1]);
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
fflush(NULL); /* flush all streams */
|
|
sigexit(- (exitcode & 0xff));
|
|
#else
|
|
exit(exitcode);
|
|
#endif
|
|
}
|
|
|
|
static int check_and_run_traps(int sig)
|
|
{
|
|
static const struct timespec zero_timespec = { 0, 0 };
|
|
smalluint save_rcode;
|
|
int last_sig = 0;
|
|
|
|
if (sig)
|
|
goto jump_in;
|
|
while (1) {
|
|
sig = sigtimedwait(&G.blocked_set, NULL, &zero_timespec);
|
|
if (sig <= 0)
|
|
break;
|
|
jump_in:
|
|
last_sig = sig;
|
|
if (G.traps && G.traps[sig]) {
|
|
if (G.traps[sig][0]) {
|
|
/* We have user-defined handler */
|
|
char *argv[] = { NULL, xstrdup(G.traps[sig]), NULL };
|
|
save_rcode = G.last_exitcode;
|
|
builtin_eval(argv);
|
|
free(argv[1]);
|
|
G.last_exitcode = save_rcode;
|
|
} /* else: "" trap, ignoring signal */
|
|
continue;
|
|
}
|
|
/* not a trap: special action */
|
|
switch (sig) {
|
|
#if ENABLE_HUSH_FAST
|
|
case SIGCHLD:
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
break;
|
|
#endif
|
|
case SIGINT:
|
|
/* Builtin was ^C'ed, make it look prettier: */
|
|
bb_putchar('\n');
|
|
G.flag_SIGINT = 1;
|
|
break;
|
|
#if ENABLE_HUSH_JOB
|
|
case SIGHUP: {
|
|
struct pipe *job;
|
|
/* bash is observed to signal whole process groups,
|
|
* not individual processes */
|
|
for (job = G.job_list; job; job = job->next) {
|
|
if (job->pgrp <= 0)
|
|
continue;
|
|
debug_printf_exec("HUPing pgrp %d\n", job->pgrp);
|
|
if (kill(- job->pgrp, SIGHUP) == 0)
|
|
kill(- job->pgrp, SIGCONT);
|
|
}
|
|
sigexit(SIGHUP);
|
|
}
|
|
#endif
|
|
default: /* ignored: */
|
|
/* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
|
|
break;
|
|
}
|
|
}
|
|
return last_sig;
|
|
}
|
|
|
|
|
|
static const char *set_cwd(void)
|
|
{
|
|
/* xrealloc_getcwd_or_warn(arg) calls free(arg),
|
|
* we must not try to free(bb_msg_unknown) */
|
|
if (G.cwd == bb_msg_unknown)
|
|
G.cwd = NULL;
|
|
G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
|
|
if (!G.cwd)
|
|
G.cwd = bb_msg_unknown;
|
|
return G.cwd;
|
|
}
|
|
|
|
|
|
/*
|
|
* Shell and environment variable support
|
|
*/
|
|
static struct variable **get_ptr_to_local_var(const char *name)
|
|
{
|
|
struct variable **pp;
|
|
struct variable *cur;
|
|
int len;
|
|
|
|
len = strlen(name);
|
|
pp = &G.top_var;
|
|
while ((cur = *pp) != NULL) {
|
|
if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
|
|
return pp;
|
|
pp = &cur->next;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct variable *get_local_var(const char *name)
|
|
{
|
|
struct variable **pp = get_ptr_to_local_var(name);
|
|
if (pp)
|
|
return *pp;
|
|
return NULL;
|
|
}
|
|
|
|
static const char *get_local_var_value(const char *name)
|
|
{
|
|
struct variable **pp = get_ptr_to_local_var(name);
|
|
if (pp)
|
|
return strchr((*pp)->varstr, '=') + 1;
|
|
return NULL;
|
|
}
|
|
|
|
/* str holds "NAME=VAL" and is expected to be malloced.
|
|
* We take ownership of it.
|
|
* flg_export:
|
|
* 0: do not change export flag
|
|
* (if creating new variable, flag will be 0)
|
|
* 1: set export flag and putenv the variable
|
|
* -1: clear export flag and unsetenv the variable
|
|
* flg_read_only is set only when we handle -R var=val
|
|
*/
|
|
#if BB_MMU
|
|
#define set_local_var(str, flg_export, flg_read_only) \
|
|
set_local_var(str, flg_export)
|
|
#endif
|
|
static int set_local_var(char *str, int flg_export, int flg_read_only)
|
|
{
|
|
struct variable *cur;
|
|
char *eq_sign;
|
|
int name_len;
|
|
|
|
eq_sign = strchr(str, '=');
|
|
if (!eq_sign) { /* not expected to ever happen? */
|
|
free(str);
|
|
return -1;
|
|
}
|
|
|
|
name_len = eq_sign - str + 1; /* including '=' */
|
|
cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
|
|
while (1) {
|
|
if (strncmp(cur->varstr, str, name_len) != 0) {
|
|
if (!cur->next) {
|
|
/* Bail out. Note that now cur points
|
|
* to the last var in the linked list */
|
|
break;
|
|
}
|
|
cur = cur->next;
|
|
continue;
|
|
}
|
|
/* We found an existing var with this name */
|
|
if (cur->flg_read_only) {
|
|
#if !BB_MMU
|
|
if (!flg_read_only)
|
|
#endif
|
|
bb_error_msg("%s: readonly variable", str);
|
|
free(str);
|
|
return -1;
|
|
}
|
|
if (flg_export == -1) {
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
|
|
*eq_sign = '\0';
|
|
unsetenv(str);
|
|
*eq_sign = '=';
|
|
}
|
|
if (strcmp(cur->varstr + name_len, eq_sign + 1) == 0) {
|
|
free_and_exp:
|
|
free(str);
|
|
goto exp;
|
|
}
|
|
if (cur->max_len >= strlen(str)) {
|
|
/* This one is from startup env, reuse space */
|
|
strcpy(cur->varstr, str);
|
|
goto free_and_exp;
|
|
}
|
|
/* max_len == 0 signifies "malloced" var, which we can
|
|
* (and has to) free */
|
|
if (!cur->max_len)
|
|
free(cur->varstr);
|
|
cur->max_len = 0;
|
|
goto set_str_and_exp;
|
|
}
|
|
|
|
/* Not found - create next variable struct */
|
|
cur->next = xzalloc(sizeof(*cur));
|
|
cur = cur->next;
|
|
|
|
set_str_and_exp:
|
|
cur->varstr = str;
|
|
#if !BB_MMU
|
|
cur->flg_read_only = flg_read_only;
|
|
#endif
|
|
exp:
|
|
if (flg_export == 1)
|
|
cur->flg_export = 1;
|
|
if (name_len == 4 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
|
cmdedit_update_prompt();
|
|
if (cur->flg_export) {
|
|
if (flg_export == -1) {
|
|
cur->flg_export = 0;
|
|
/* unsetenv was already done */
|
|
} else {
|
|
debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
|
|
return putenv(cur->varstr);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int unset_local_var_len(const char *name, int name_len)
|
|
{
|
|
struct variable *cur;
|
|
struct variable **var_pp;
|
|
|
|
if (!name)
|
|
return EXIT_SUCCESS;
|
|
var_pp = &G.top_var;
|
|
while ((cur = *var_pp) != NULL) {
|
|
if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
|
|
if (cur->flg_read_only) {
|
|
bb_error_msg("%s: readonly variable", name);
|
|
return EXIT_FAILURE;
|
|
}
|
|
*var_pp = cur->next;
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
|
|
bb_unsetenv(cur->varstr);
|
|
if (name_len == 3 && cur->varstr[0] == 'P' && cur->varstr[1] == 'S')
|
|
cmdedit_update_prompt();
|
|
if (!cur->max_len)
|
|
free(cur->varstr);
|
|
free(cur);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
var_pp = &cur->next;
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int unset_local_var(const char *name)
|
|
{
|
|
return unset_local_var_len(name, strlen(name));
|
|
}
|
|
|
|
static void unset_vars(char **strings)
|
|
{
|
|
char **v;
|
|
|
|
if (!strings)
|
|
return;
|
|
v = strings;
|
|
while (*v) {
|
|
const char *eq = strchrnul(*v, '=');
|
|
unset_local_var_len(*v, (int)(eq - *v));
|
|
v++;
|
|
}
|
|
free(strings);
|
|
}
|
|
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
|
|
#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
|
|
static char *endofname(const char *name)
|
|
{
|
|
char *p;
|
|
|
|
p = (char *) name;
|
|
if (!is_name(*p))
|
|
return p;
|
|
while (*++p) {
|
|
if (!is_in_name(*p))
|
|
break;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
static void arith_set_local_var(const char *name, const char *val, int flags)
|
|
{
|
|
/* arith code doesnt malloc space, so do it for it */
|
|
char *var = xasprintf("%s=%s", name, val);
|
|
set_local_var(var, flags, 0);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Helpers for "var1=val1 var2=val2 cmd" feature
|
|
*/
|
|
static void add_vars(struct variable *var)
|
|
{
|
|
struct variable *next;
|
|
|
|
while (var) {
|
|
next = var->next;
|
|
var->next = G.top_var;
|
|
G.top_var = var;
|
|
if (var->flg_export) {
|
|
debug_printf_env("%s: restoring exported '%s'\n", __func__, var->varstr);
|
|
putenv(var->varstr);
|
|
} else {
|
|
debug_printf_env("%s: restoring local '%s'\n", __func__, var->varstr);
|
|
}
|
|
var = next;
|
|
}
|
|
}
|
|
|
|
static struct variable *set_vars_and_save_old(char **strings)
|
|
{
|
|
char **s;
|
|
struct variable *old = NULL;
|
|
|
|
if (!strings)
|
|
return old;
|
|
s = strings;
|
|
while (*s) {
|
|
struct variable *var_p;
|
|
struct variable **var_pp;
|
|
char *eq;
|
|
|
|
eq = strchr(*s, '=');
|
|
if (eq) {
|
|
*eq = '\0';
|
|
var_pp = get_ptr_to_local_var(*s);
|
|
*eq = '=';
|
|
if (var_pp) {
|
|
/* Remove variable from global linked list */
|
|
var_p = *var_pp;
|
|
debug_printf_env("%s: removing '%s'\n", __func__, var_p->varstr);
|
|
*var_pp = var_p->next;
|
|
/* Add it to returned list */
|
|
var_p->next = old;
|
|
old = var_p;
|
|
}
|
|
set_local_var(*s, 1, 0);
|
|
}
|
|
s++;
|
|
}
|
|
return old;
|
|
}
|
|
|
|
|
|
/*
|
|
* in_str support
|
|
*/
|
|
static int static_get(struct in_str *i)
|
|
{
|
|
int ch = *i->p++;
|
|
if (ch != '\0')
|
|
return ch;
|
|
i->p--;
|
|
return EOF;
|
|
}
|
|
|
|
static int static_peek(struct in_str *i)
|
|
{
|
|
return *i->p;
|
|
}
|
|
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
|
|
static void cmdedit_update_prompt(void)
|
|
{
|
|
if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
|
G.PS1 = get_local_var_value("PS1");
|
|
if (G.PS1 == NULL)
|
|
G.PS1 = "\\w \\$ ";
|
|
G.PS2 = get_local_var_value("PS2");
|
|
} else {
|
|
G.PS1 = NULL;
|
|
}
|
|
if (G.PS2 == NULL)
|
|
G.PS2 = "> ";
|
|
}
|
|
|
|
static const char* setup_prompt_string(int promptmode)
|
|
{
|
|
const char *prompt_str;
|
|
debug_printf("setup_prompt_string %d ", promptmode);
|
|
if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
|
|
/* Set up the prompt */
|
|
if (promptmode == 0) { /* PS1 */
|
|
free((char*)G.PS1);
|
|
G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
|
|
prompt_str = G.PS1;
|
|
} else
|
|
prompt_str = G.PS2;
|
|
} else
|
|
prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
|
|
debug_printf("result '%s'\n", prompt_str);
|
|
return prompt_str;
|
|
}
|
|
|
|
static void get_user_input(struct in_str *i)
|
|
{
|
|
int r;
|
|
const char *prompt_str;
|
|
|
|
prompt_str = setup_prompt_string(i->promptmode);
|
|
#if ENABLE_FEATURE_EDITING
|
|
/* Enable command line editing only while a command line
|
|
* is actually being read */
|
|
do {
|
|
G.flag_SIGINT = 0;
|
|
/* buglet: SIGINT will not make new prompt to appear _at once_,
|
|
* only after <Enter>. (^C will work) */
|
|
r = read_line_input(prompt_str, G.user_input_buf, BUFSIZ-1, G.line_input_state);
|
|
/* catch *SIGINT* etc (^C is handled by read_line_input) */
|
|
check_and_run_traps(0);
|
|
} while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
|
|
i->eof_flag = (r < 0);
|
|
if (i->eof_flag) { /* EOF/error detected */
|
|
G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
|
|
G.user_input_buf[1] = '\0';
|
|
}
|
|
#else
|
|
do {
|
|
G.flag_SIGINT = 0;
|
|
fputs(prompt_str, stdout);
|
|
fflush(stdout);
|
|
G.user_input_buf[0] = r = fgetc(i->file);
|
|
/*G.user_input_buf[1] = '\0'; - already is and never changed */
|
|
//do we need check_and_run_traps(0)? (maybe only if stdin)
|
|
} while (G.flag_SIGINT);
|
|
i->eof_flag = (r == EOF);
|
|
#endif
|
|
i->p = G.user_input_buf;
|
|
}
|
|
|
|
#endif /* INTERACTIVE */
|
|
|
|
/* This is the magic location that prints prompts
|
|
* and gets data back from the user */
|
|
static int file_get(struct in_str *i)
|
|
{
|
|
int ch;
|
|
|
|
/* If there is data waiting, eat it up */
|
|
if (i->p && *i->p) {
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
take_cached:
|
|
#endif
|
|
ch = *i->p++;
|
|
if (i->eof_flag && !*i->p)
|
|
ch = EOF;
|
|
/* note: ch is never NUL */
|
|
} else {
|
|
/* need to double check i->file because we might be doing something
|
|
* more complicated by now, like sourcing or substituting. */
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
if (G_interactive_fd && i->promptme && i->file == stdin) {
|
|
do {
|
|
get_user_input(i);
|
|
} while (!*i->p); /* need non-empty line */
|
|
i->promptmode = 1; /* PS2 */
|
|
i->promptme = 0;
|
|
goto take_cached;
|
|
}
|
|
#endif
|
|
do ch = fgetc(i->file); while (ch == '\0');
|
|
}
|
|
debug_printf("file_get: got '%c' %d\n", ch, ch);
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
if (ch == '\n')
|
|
i->promptme = 1;
|
|
#endif
|
|
return ch;
|
|
}
|
|
|
|
/* All callers guarantee this routine will never
|
|
* be used right after a newline, so prompting is not needed.
|
|
*/
|
|
static int file_peek(struct in_str *i)
|
|
{
|
|
int ch;
|
|
if (i->p && *i->p) {
|
|
if (i->eof_flag && !i->p[1])
|
|
return EOF;
|
|
return *i->p;
|
|
/* note: ch is never NUL */
|
|
}
|
|
do ch = fgetc(i->file); while (ch == '\0');
|
|
i->eof_flag = (ch == EOF);
|
|
i->peek_buf[0] = ch;
|
|
i->peek_buf[1] = '\0';
|
|
i->p = i->peek_buf;
|
|
debug_printf("file_peek: got '%c' %d\n", ch, ch);
|
|
return ch;
|
|
}
|
|
|
|
static void setup_file_in_str(struct in_str *i, FILE *f)
|
|
{
|
|
i->peek = file_peek;
|
|
i->get = file_get;
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
i->promptme = 1;
|
|
i->promptmode = 0; /* PS1 */
|
|
#endif
|
|
i->file = f;
|
|
i->p = NULL;
|
|
}
|
|
|
|
static void setup_string_in_str(struct in_str *i, const char *s)
|
|
{
|
|
i->peek = static_peek;
|
|
i->get = static_get;
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
i->promptme = 1;
|
|
i->promptmode = 0; /* PS1 */
|
|
#endif
|
|
i->p = s;
|
|
i->eof_flag = 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* o_string support
|
|
*/
|
|
#define B_CHUNK (32 * sizeof(char*))
|
|
|
|
static void o_reset_to_empty_unquoted(o_string *o)
|
|
{
|
|
o->length = 0;
|
|
o->o_quoted = 0;
|
|
if (o->data)
|
|
o->data[0] = '\0';
|
|
}
|
|
|
|
static void o_free(o_string *o)
|
|
{
|
|
free(o->data);
|
|
memset(o, 0, sizeof(*o));
|
|
}
|
|
|
|
static ALWAYS_INLINE void o_free_unsafe(o_string *o)
|
|
{
|
|
free(o->data);
|
|
}
|
|
|
|
static void o_grow_by(o_string *o, int len)
|
|
{
|
|
if (o->length + len > o->maxlen) {
|
|
o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
|
|
o->data = xrealloc(o->data, 1 + o->maxlen);
|
|
}
|
|
}
|
|
|
|
static void o_addchr(o_string *o, int ch)
|
|
{
|
|
debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
|
|
o_grow_by(o, 1);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addblock(o_string *o, const char *str, int len)
|
|
{
|
|
o_grow_by(o, len);
|
|
memcpy(&o->data[o->length], str, len);
|
|
o->length += len;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
#if !BB_MMU
|
|
static void o_addstr(o_string *o, const char *str)
|
|
{
|
|
o_addblock(o, str, strlen(str));
|
|
}
|
|
static void nommu_addchr(o_string *o, int ch)
|
|
{
|
|
if (o)
|
|
o_addchr(o, ch);
|
|
}
|
|
#else
|
|
# define nommu_addchr(o, str) ((void)0)
|
|
#endif
|
|
|
|
static void o_addstr_with_NUL(o_string *o, const char *str)
|
|
{
|
|
o_addblock(o, str, strlen(str) + 1);
|
|
}
|
|
|
|
static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
|
|
{
|
|
while (len) {
|
|
o_addchr(o, *str);
|
|
if (*str++ == '\\'
|
|
&& (*str != '*' && *str != '?' && *str != '[')
|
|
) {
|
|
o_addchr(o, '\\');
|
|
}
|
|
len--;
|
|
}
|
|
}
|
|
|
|
/* My analysis of quoting semantics tells me that state information
|
|
* is associated with a destination, not a source.
|
|
*/
|
|
static void o_addqchr(o_string *o, int ch)
|
|
{
|
|
int sz = 1;
|
|
char *found = strchr("*?[\\", ch);
|
|
if (found)
|
|
sz++;
|
|
o_grow_by(o, sz);
|
|
if (found) {
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addQchr(o_string *o, int ch)
|
|
{
|
|
int sz = 1;
|
|
if (o->o_escape && strchr("*?[\\", ch)) {
|
|
sz++;
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o_grow_by(o, sz);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
|
|
static void o_addQstr(o_string *o, const char *str, int len)
|
|
{
|
|
if (!o->o_escape) {
|
|
o_addblock(o, str, len);
|
|
return;
|
|
}
|
|
while (len) {
|
|
char ch;
|
|
int sz;
|
|
int ordinary_cnt = strcspn(str, "*?[\\");
|
|
if (ordinary_cnt > len) /* paranoia */
|
|
ordinary_cnt = len;
|
|
o_addblock(o, str, ordinary_cnt);
|
|
if (ordinary_cnt == len)
|
|
return;
|
|
str += ordinary_cnt;
|
|
len -= ordinary_cnt + 1; /* we are processing + 1 char below */
|
|
|
|
ch = *str++;
|
|
sz = 1;
|
|
if (ch) { /* it is necessarily one of "*?[\\" */
|
|
sz++;
|
|
o->data[o->length] = '\\';
|
|
o->length++;
|
|
}
|
|
o_grow_by(o, sz);
|
|
o->data[o->length] = ch;
|
|
o->length++;
|
|
o->data[o->length] = '\0';
|
|
}
|
|
}
|
|
|
|
/* A special kind of o_string for $VAR and `cmd` expansion.
|
|
* It contains char* list[] at the beginning, which is grown in 16 element
|
|
* increments. Actual string data starts at the next multiple of 16 * (char*).
|
|
* list[i] contains an INDEX (int!) into this string data.
|
|
* It means that if list[] needs to grow, data needs to be moved higher up
|
|
* but list[i]'s need not be modified.
|
|
* NB: remembering how many list[i]'s you have there is crucial.
|
|
* o_finalize_list() operation post-processes this structure - calculates
|
|
* and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
|
|
*/
|
|
#if DEBUG_EXPAND || DEBUG_GLOB
|
|
static void debug_print_list(const char *prefix, o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
int i = 0;
|
|
|
|
indent();
|
|
fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n",
|
|
prefix, list, n, string_start, o->length, o->maxlen);
|
|
while (i < n) {
|
|
indent();
|
|
fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i],
|
|
o->data + (int)list[i] + string_start,
|
|
o->data + (int)list[i] + string_start);
|
|
i++;
|
|
}
|
|
if (n) {
|
|
const char *p = o->data + (int)list[n - 1] + string_start;
|
|
indent();
|
|
fprintf(stderr, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
|
|
}
|
|
}
|
|
#else
|
|
# define debug_print_list(prefix, o, n) ((void)0)
|
|
#endif
|
|
|
|
/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
|
|
* in list[n] so that it points past last stored byte so far.
|
|
* It returns n+1. */
|
|
static int o_save_ptr_helper(o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start;
|
|
int string_len;
|
|
|
|
if (!o->has_empty_slot) {
|
|
string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
string_len = o->length - string_start;
|
|
if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
|
|
debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
|
|
/* list[n] points to string_start, make space for 16 more pointers */
|
|
o->maxlen += 0x10 * sizeof(list[0]);
|
|
o->data = xrealloc(o->data, o->maxlen + 1);
|
|
list = (char**)o->data;
|
|
memmove(list + n + 0x10, list + n, string_len);
|
|
o->length += 0x10 * sizeof(list[0]);
|
|
} else {
|
|
debug_printf_list("list[%d]=%d string_start=%d\n",
|
|
n, string_len, string_start);
|
|
}
|
|
} else {
|
|
/* We have empty slot at list[n], reuse without growth */
|
|
string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
|
|
string_len = o->length - string_start;
|
|
debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
|
|
n, string_len, string_start);
|
|
o->has_empty_slot = 0;
|
|
}
|
|
list[n] = (char*)(ptrdiff_t)string_len;
|
|
return n + 1;
|
|
}
|
|
|
|
/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
|
|
static int o_get_last_ptr(o_string *o, int n)
|
|
{
|
|
char **list = (char**)o->data;
|
|
int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
|
|
return ((int)(ptrdiff_t)list[n-1]) + string_start;
|
|
}
|
|
|
|
/* o_glob performs globbing on last list[], saving each result
|
|
* as a new list[]. */
|
|
static int o_glob(o_string *o, int n)
|
|
{
|
|
glob_t globdata;
|
|
int gr;
|
|
char *pattern;
|
|
|
|
debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data);
|
|
if (!o->data)
|
|
return o_save_ptr_helper(o, n);
|
|
pattern = o->data + o_get_last_ptr(o, n);
|
|
debug_printf_glob("glob pattern '%s'\n", pattern);
|
|
if (!glob_needed(pattern)) {
|
|
literal:
|
|
o->length = unbackslash(pattern) - o->data;
|
|
debug_printf_glob("glob pattern '%s' is literal\n", pattern);
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
|
|
memset(&globdata, 0, sizeof(globdata));
|
|
gr = glob(pattern, 0, NULL, &globdata);
|
|
debug_printf_glob("glob('%s'):%d\n", pattern, gr);
|
|
if (gr == GLOB_NOSPACE)
|
|
bb_error_msg_and_die("out of memory during glob");
|
|
if (gr == GLOB_NOMATCH) {
|
|
globfree(&globdata);
|
|
goto literal;
|
|
}
|
|
if (gr != 0) { /* GLOB_ABORTED ? */
|
|
/* TODO: testcase for bad glob pattern behavior */
|
|
bb_error_msg("glob(3) error %d on '%s'", gr, pattern);
|
|
}
|
|
if (globdata.gl_pathv && globdata.gl_pathv[0]) {
|
|
char **argv = globdata.gl_pathv;
|
|
o->length = pattern - o->data; /* "forget" pattern */
|
|
while (1) {
|
|
o_addstr_with_NUL(o, *argv);
|
|
n = o_save_ptr_helper(o, n);
|
|
argv++;
|
|
if (!*argv)
|
|
break;
|
|
}
|
|
}
|
|
globfree(&globdata);
|
|
if (DEBUG_GLOB)
|
|
debug_print_list("o_glob returning", o, n);
|
|
return n;
|
|
}
|
|
|
|
/* If o->o_glob == 1, glob the string so far remembered.
|
|
* Otherwise, just finish current list[] and start new */
|
|
static int o_save_ptr(o_string *o, int n)
|
|
{
|
|
if (o->o_glob) { /* if globbing is requested */
|
|
/* If o->has_empty_slot, list[n] was already globbed
|
|
* (if it was requested back then when it was filled)
|
|
* so don't do that again! */
|
|
if (!o->has_empty_slot)
|
|
return o_glob(o, n); /* o_save_ptr_helper is inside */
|
|
}
|
|
return o_save_ptr_helper(o, n);
|
|
}
|
|
|
|
/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
|
|
static char **o_finalize_list(o_string *o, int n)
|
|
{
|
|
char **list;
|
|
int string_start;
|
|
|
|
n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
|
|
if (DEBUG_EXPAND)
|
|
debug_print_list("finalized", o, n);
|
|
debug_printf_expand("finalized n:%d\n", n);
|
|
list = (char**)o->data;
|
|
string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
|
|
list[--n] = NULL;
|
|
while (n) {
|
|
n--;
|
|
list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start;
|
|
}
|
|
return list;
|
|
}
|
|
|
|
|
|
/* Expansion can recurse */
|
|
#if ENABLE_HUSH_TICK
|
|
static int process_command_subs(o_string *dest, const char *s);
|
|
#endif
|
|
static char *expand_string_to_string(const char *str);
|
|
#if BB_MMU
|
|
#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
|
|
parse_stream_dquoted(dest, input, dquote_end)
|
|
#endif
|
|
static int parse_stream_dquoted(o_string *as_string,
|
|
o_string *dest,
|
|
struct in_str *input,
|
|
int dquote_end);
|
|
|
|
/* expand_strvec_to_strvec() takes a list of strings, expands
|
|
* all variable references within and returns a pointer to
|
|
* a list of expanded strings, possibly with larger number
|
|
* of strings. (Think VAR="a b"; echo $VAR).
|
|
* This new list is allocated as a single malloc block.
|
|
* NULL-terminated list of char* pointers is at the beginning of it,
|
|
* followed by strings themself.
|
|
* Caller can deallocate entire list by single free(list). */
|
|
|
|
/* Store given string, finalizing the word and starting new one whenever
|
|
* we encounter IFS char(s). This is used for expanding variable values.
|
|
* End-of-string does NOT finalize word: think about 'echo -$VAR-' */
|
|
static int expand_on_ifs(o_string *output, int n, const char *str)
|
|
{
|
|
while (1) {
|
|
int word_len = strcspn(str, G.ifs);
|
|
if (word_len) {
|
|
if (output->o_escape || !output->o_glob)
|
|
o_addQstr(output, str, word_len);
|
|
else /* protect backslashes against globbing up :) */
|
|
o_addblock_duplicate_backslash(output, str, word_len);
|
|
str += word_len;
|
|
}
|
|
if (!*str) /* EOL - do not finalize word */
|
|
break;
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_on_ifs", output, n);
|
|
n = o_save_ptr(output, n);
|
|
str += strspn(str, G.ifs); /* skip ifs chars */
|
|
}
|
|
debug_print_list("expand_on_ifs[1]", output, n);
|
|
return n;
|
|
}
|
|
|
|
/* Helper to expand $((...)) and heredoc body. These act as if
|
|
* they are in double quotes, with the exception that they are not :).
|
|
* Just the rules are similar: "expand only $var and `cmd`"
|
|
*
|
|
* Returns malloced string.
|
|
* As an optimization, we return NULL if expansion is not needed.
|
|
*/
|
|
static char *expand_pseudo_dquoted(const char *str)
|
|
{
|
|
char *exp_str;
|
|
struct in_str input;
|
|
o_string dest = NULL_O_STRING;
|
|
|
|
if (strchr(str, '$') == NULL
|
|
#if ENABLE_HUSH_TICK
|
|
&& strchr(str, '`') == NULL
|
|
#endif
|
|
) {
|
|
return NULL;
|
|
}
|
|
|
|
/* We need to expand. Example:
|
|
* echo $(($a + `echo 1`)) $((1 + $((2)) ))
|
|
*/
|
|
setup_string_in_str(&input, str);
|
|
parse_stream_dquoted(NULL, &dest, &input, EOF);
|
|
//bb_error_msg("'%s' -> '%s'", str, dest.data);
|
|
exp_str = expand_string_to_string(dest.data);
|
|
//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
|
|
o_free_unsafe(&dest);
|
|
return exp_str;
|
|
}
|
|
|
|
/* Expand all variable references in given string, adding words to list[]
|
|
* at n, n+1,... positions. Return updated n (so that list[n] is next one
|
|
* to be filled). This routine is extremely tricky: has to deal with
|
|
* variables/parameters with whitespace, $* and $@, and constructs like
|
|
* 'echo -$*-'. If you play here, you must run testsuite afterwards! */
|
|
static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
|
|
{
|
|
/* or_mask is either 0 (normal case) or 0x80 -
|
|
* expansion of right-hand side of assignment == 1-element expand.
|
|
* It will also do no globbing, and thus we must not backslash-quote!
|
|
*/
|
|
char ored_ch;
|
|
char *p;
|
|
|
|
ored_ch = 0;
|
|
|
|
debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
|
|
debug_print_list("expand_vars_to_list", output, n);
|
|
n = o_save_ptr(output, n);
|
|
debug_print_list("expand_vars_to_list[0]", output, n);
|
|
|
|
while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
|
|
char first_ch;
|
|
int i;
|
|
char *dyn_val = NULL;
|
|
const char *val = NULL;
|
|
#if ENABLE_HUSH_TICK
|
|
o_string subst_result = NULL_O_STRING;
|
|
#endif
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
char arith_buf[sizeof(arith_t)*3 + 2];
|
|
#endif
|
|
o_addblock(output, arg, p - arg);
|
|
debug_print_list("expand_vars_to_list[1]", output, n);
|
|
arg = ++p;
|
|
p = strchr(p, SPECIAL_VAR_SYMBOL);
|
|
|
|
first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
|
|
/* "$@" is special. Even if quoted, it can still
|
|
* expand to nothing (not even an empty string) */
|
|
if ((first_ch & 0x7f) != '@')
|
|
ored_ch |= first_ch;
|
|
|
|
switch (first_ch & 0x7f) {
|
|
/* Highest bit in first_ch indicates that var is double-quoted */
|
|
case '$': /* pid */
|
|
val = utoa(G.root_pid);
|
|
break;
|
|
case '!': /* bg pid */
|
|
val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
|
|
break;
|
|
case '?': /* exitcode */
|
|
val = utoa(G.last_exitcode);
|
|
break;
|
|
case '#': /* argc */
|
|
if (arg[1] != SPECIAL_VAR_SYMBOL)
|
|
/* actually, it's a ${#var} */
|
|
goto case_default;
|
|
val = utoa(G.global_argc ? G.global_argc-1 : 0);
|
|
break;
|
|
case '*':
|
|
case '@':
|
|
i = 1;
|
|
if (!G.global_argv[i])
|
|
break;
|
|
ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
|
|
if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
|
|
smallint sv = output->o_escape;
|
|
/* unquoted var's contents should be globbed, so don't escape */
|
|
output->o_escape = 0;
|
|
while (G.global_argv[i]) {
|
|
n = expand_on_ifs(output, n, G.global_argv[i]);
|
|
debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
|
|
if (G.global_argv[i++][0] && G.global_argv[i]) {
|
|
/* this argv[] is not empty and not last:
|
|
* put terminating NUL, start new word */
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_vars_to_list[2]", output, n);
|
|
n = o_save_ptr(output, n);
|
|
debug_print_list("expand_vars_to_list[3]", output, n);
|
|
}
|
|
}
|
|
output->o_escape = sv;
|
|
} else
|
|
/* If or_mask is nonzero, we handle assignment 'a=....$@.....'
|
|
* and in this case should treat it like '$*' - see 'else...' below */
|
|
if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
|
|
while (1) {
|
|
o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
|
|
if (++i >= G.global_argc)
|
|
break;
|
|
o_addchr(output, '\0');
|
|
debug_print_list("expand_vars_to_list[4]", output, n);
|
|
n = o_save_ptr(output, n);
|
|
}
|
|
} else { /* quoted $*: add as one word */
|
|
while (1) {
|
|
o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
|
|
if (!G.global_argv[++i])
|
|
break;
|
|
if (G.ifs[0])
|
|
o_addchr(output, G.ifs[0]);
|
|
}
|
|
}
|
|
break;
|
|
case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
|
|
/* "Empty variable", used to make "" etc to not disappear */
|
|
arg++;
|
|
ored_ch = 0x80;
|
|
break;
|
|
#if ENABLE_HUSH_TICK
|
|
case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
|
|
*p = '\0';
|
|
arg++;
|
|
/* Can't just stuff it into output o_string,
|
|
* expanded result may need to be globbed
|
|
* and $IFS-splitted */
|
|
debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
|
|
process_command_subs(&subst_result, arg);
|
|
debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
|
|
val = subst_result.data;
|
|
goto store_val;
|
|
#endif
|
|
#if ENABLE_SH_MATH_SUPPORT
|
|
case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
|
|
arith_eval_hooks_t hooks;
|
|
arith_t res;
|
|
int errcode;
|
|
char *exp_str;
|
|
|
|
arg++; /* skip '+' */
|
|
*p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
|
|
debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
|
|
|
|
exp_str = expand_pseudo_dquoted(arg);
|
|
hooks.lookupvar = get_local_var_value;
|
|
hooks.setvar = arith_set_local_var;
|
|
hooks.endofname = endofname;
|
|
res = arith(exp_str ? exp_str : arg, &errcode, &hooks);
|
|
free(exp_str);
|
|
|
|
if (errcode < 0) {
|
|
const char *msg = "error in arithmetic";
|
|
switch (errcode) {
|
|
case -3:
|
|
msg = "exponent less than 0";
|
|
break;
|
|
case -2:
|
|
msg = "divide by 0";
|
|
break;
|
|
case -5:
|
|
msg = "expression recursion loop detected";
|
|
break;
|
|
}
|
|
die_if_script(msg);
|
|
}
|
|
debug_printf_subst("ARITH RES '"arith_t_fmt"'\n", res);
|
|
sprintf(arith_buf, arith_t_fmt, res);
|
|
val = arith_buf;
|
|
break;
|
|
}
|
|
#endif
|
|
default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
|
|
case_default: {
|
|
bool exp_len = false;
|
|
bool exp_null = false;
|
|
char *var = arg;
|
|
char exp_save = exp_save; /* for compiler */
|
|
char exp_op = exp_op; /* for compiler */
|
|
char *exp_word = exp_word; /* for compiler */
|
|
size_t exp_off = 0;
|
|
|
|
*p = '\0';
|
|
arg[0] = first_ch & 0x7f;
|
|
|
|
/* prepare for expansions */
|
|
if (var[0] == '#') {
|
|
/* handle length expansion ${#var} */
|
|
exp_len = true;
|
|
++var;
|
|
} else {
|
|
/* maybe handle parameter expansion */
|
|
exp_off = strcspn(var, ":-=+?%#");
|
|
if (!var[exp_off])
|
|
exp_off = 0;
|
|
if (exp_off) {
|
|
exp_save = var[exp_off];
|
|
exp_null = exp_save == ':';
|
|
exp_word = var + exp_off;
|
|
if (exp_null)
|
|
++exp_word;
|
|
exp_op = *exp_word++;
|
|
var[exp_off] = '\0';
|
|
}
|
|
}
|
|
|
|
/* lookup the variable in question */
|
|
if (isdigit(var[0])) {
|
|
/* handle_dollar() should have vetted var for us */
|
|
i = xatoi_u(var);
|
|
if (i < G.global_argc)
|
|
val = G.global_argv[i];
|
|
/* else val remains NULL: $N with too big N */
|
|
} else
|
|
val = get_local_var_value(var);
|
|
|
|
/* handle any expansions */
|
|
if (exp_len) {
|
|
debug_printf_expand("expand: length of '%s' = ", val);
|
|
val = utoa(val ? strlen(val) : 0);
|
|
debug_printf_expand("%s\n", val);
|
|
} else if (exp_off) {
|
|
if (exp_op == '%' || exp_op == '#') {
|
|
if (val) {
|
|
/* we need to do a pattern match */
|
|
bool match_at_left;
|
|
char *loc;
|
|
scan_t scan = pick_scan(exp_op, *exp_word, &match_at_left);
|
|
if (exp_op == *exp_word) /* ## or %% */
|
|
++exp_word;
|
|
val = dyn_val = xstrdup(val);
|
|
loc = scan(dyn_val, exp_word, match_at_left);
|
|
if (match_at_left) /* # or ## */
|
|
val = loc;
|
|
else if (loc) /* % or %% and match was found */
|
|
*loc = '\0';
|
|
}
|
|
} else {
|
|
/* we need to do an expansion */
|
|
int exp_test = (!val || (exp_null && !val[0]));
|
|
if (exp_op == '+')
|
|
exp_test = !exp_test;
|
|
debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
|
|
exp_null ? "true" : "false", exp_test);
|
|
if (exp_test) {
|
|
if (exp_op == '?') {
|
|
//TODO: how interactive bash aborts expansion mid-command?
|
|
/* ${var?[error_msg_if_unset]} */
|
|
/* ${var:?[error_msg_if_unset_or_null]} */
|
|
/* mimic bash message */
|
|
die_if_script("%s: %s",
|
|
var,
|
|
exp_word[0] ? exp_word : "parameter null or not set"
|
|
);
|
|
} else {
|
|
val = exp_word;
|
|
}
|
|
|
|
if (exp_op == '=') {
|
|
/* ${var=[word]} or ${var:=[word]} */
|
|
if (isdigit(var[0]) || var[0] == '#') {
|
|
/* mimic bash message */
|
|
die_if_script("$%s: cannot assign in this way", var);
|
|
val = NULL;
|
|
} else {
|
|
char *new_var = xasprintf("%s=%s", var, val);
|
|
set_local_var(new_var, 0, 0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
var[exp_off] = exp_save;
|
|
}
|
|
|
|
arg[0] = first_ch;
|
|
#if ENABLE_HUSH_TICK
|
|
store_val:
|
|
#endif
|
|
if (!(first_ch & 0x80)) { /* unquoted $VAR */
|
|
debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val, output->o_escape);
|
|
if (val) {
|
|
/* unquoted var's contents should be globbed, so don't escape */
|
|
smallint sv = output->o_escape;
|
|
output->o_escape = 0;
|
|
n = expand_on_ifs(output, n, val);
|
|
val = NULL;
|
|
output->o_escape = sv;
|
|
}
|
|
} else { /* quoted $VAR, val will be appended below */
|
|
debug_printf_expand("quoted '%s', output->o_escape:%d\n", val, output->o_escape);
|
|
}
|
|
} /* default: */
|
|
} /* switch (char after <SPECIAL_VAR_SYMBOL>) */
|
|
|
|
if (val) {
|
|
o_addQstr(output, val, strlen(val));
|
|
}
|
|
free(dyn_val);
|
|
/* Do the check to avoid writing to a const string */
|
|
if (*p != SPECIAL_VAR_SYMBOL)
|
|
*p = SPECIAL_VAR_SYMBOL;
|
|
|
|
#if ENABLE_HUSH_TICK
|
|
o_free(&subst_result);
|
|
#endif
|
|
arg = ++p;
|
|
} /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
|
|
|
|
if (arg[0]) {
|
|
debug_print_list("expand_vars_to_list[a]", output, n);
|
|
/* this part is literal, and it was already pre-quoted
|
|
* if needed (much earlier), do not use o_addQstr here! */
|
|
o_addstr_with_NUL(output, arg);
|
|
debug_print_list("expand_vars_to_list[b]", output, n);
|
|
} else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
|
|
&& !(ored_ch & 0x80) /* and all vars were not quoted. */
|
|
) {
|
|
n--;
|
|
/* allow to reuse list[n] later without re-growth */
|
|
output->has_empty_slot = 1;
|
|
} else {
|
|
o_addchr(output, '\0');
|
|
}
|
|
return n;
|
|
}
|
|
|
|
static char **expand_variables(char **argv, int or_mask)
|
|
{
|
|
int n;
|
|
char **list;
|
|
char **v;
|
|
o_string output = NULL_O_STRING;
|
|
|
|
if (or_mask & 0x100) {
|
|
output.o_escape = 1; /* protect against globbing for "$var" */
|
|
/* (unquoted $var will temporarily switch it off) */
|
|
output.o_glob = 1;
|
|
}
|
|
|
|
n = 0;
|
|
v = argv;
|
|
while (*v) {
|
|
n = expand_vars_to_list(&output, n, *v, (char)or_mask);
|
|
v++;
|
|
}
|
|
debug_print_list("expand_variables", &output, n);
|
|
|
|
/* output.data (malloced in one block) gets returned in "list" */
|
|
list = o_finalize_list(&output, n);
|
|
debug_print_strings("expand_variables[1]", list);
|
|
return list;
|
|
}
|
|
|
|
static char **expand_strvec_to_strvec(char **argv)
|
|
{
|
|
return expand_variables(argv, 0x100);
|
|
}
|
|
|
|
/* Used for expansion of right hand of assignments */
|
|
/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
|
|
* "v=/bin/c*" */
|
|
static char *expand_string_to_string(const char *str)
|
|
{
|
|
char *argv[2], **list;
|
|
|
|
argv[0] = (char*)str;
|
|
argv[1] = NULL;
|
|
list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
|
|
if (HUSH_DEBUG)
|
|
if (!list[0] || list[1])
|
|
bb_error_msg_and_die("BUG in varexp2");
|
|
/* actually, just move string 2*sizeof(char*) bytes back */
|
|
overlapping_strcpy((char*)list, list[0]);
|
|
unbackslash((char*)list);
|
|
debug_printf_expand("string_to_string='%s'\n", (char*)list);
|
|
return (char*)list;
|
|
}
|
|
|
|
/* Used for "eval" builtin */
|
|
static char* expand_strvec_to_string(char **argv)
|
|
{
|
|
char **list;
|
|
|
|
list = expand_variables(argv, 0x80);
|
|
/* Convert all NULs to spaces */
|
|
if (list[0]) {
|
|
int n = 1;
|
|
while (list[n]) {
|
|
if (HUSH_DEBUG)
|
|
if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
|
|
bb_error_msg_and_die("BUG in varexp3");
|
|
/* bash uses ' ' regardless of $IFS contents */
|
|
list[n][-1] = ' ';
|
|
n++;
|
|
}
|
|
}
|
|
overlapping_strcpy((char*)list, list[0]);
|
|
debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
|
|
return (char*)list;
|
|
}
|
|
|
|
static char **expand_assignments(char **argv, int count)
|
|
{
|
|
int i;
|
|
char **p = NULL;
|
|
/* Expand assignments into one string each */
|
|
for (i = 0; i < count; i++) {
|
|
p = add_string_to_strings(p, expand_string_to_string(argv[i]));
|
|
}
|
|
return p;
|
|
}
|
|
|
|
|
|
#if BB_MMU
|
|
/* never called */
|
|
void re_execute_shell(char ***to_free, const char *s, char *argv0, char **argv);
|
|
|
|
static void reset_traps_to_defaults(void)
|
|
{
|
|
/* This function is always called in a child shell
|
|
* after fork (not vfork, NOMMU doesn't use this function).
|
|
* Child shells are not interactive.
|
|
* SIGTTIN/SIGTTOU/SIGTSTP should not have special handling.
|
|
* Testcase: (while :; do :; done) + ^Z should background.
|
|
* Same goes for SIGTERM, SIGHUP, SIGINT.
|
|
*/
|
|
unsigned sig;
|
|
unsigned mask;
|
|
|
|
if (!G.traps && !(G.non_DFL_mask & SPECIAL_INTERACTIVE_SIGS))
|
|
return;
|
|
|
|
/* Stupid. It can be done with *single* &= op, but we can't use
|
|
* the fact that G.blocked_set is implemented as a bitmask... */
|
|
mask = (SPECIAL_INTERACTIVE_SIGS >> 1);
|
|
sig = 1;
|
|
while (1) {
|
|
if (mask & 1)
|
|
sigdelset(&G.blocked_set, sig);
|
|
mask >>= 1;
|
|
if (!mask)
|
|
break;
|
|
sig++;
|
|
}
|
|
|
|
G.non_DFL_mask &= ~SPECIAL_INTERACTIVE_SIGS;
|
|
mask = G.non_DFL_mask;
|
|
if (G.traps) for (sig = 0; sig < NSIG; sig++, mask >>= 1) {
|
|
if (!G.traps[sig])
|
|
continue;
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = NULL;
|
|
/* There is no signal for 0 (EXIT) */
|
|
if (sig == 0)
|
|
continue;
|
|
/* There was a trap handler, we are removing it.
|
|
* But if sig still has non-DFL handling,
|
|
* we should not unblock it. */
|
|
if (mask & 1)
|
|
continue;
|
|
sigdelset(&G.blocked_set, sig);
|
|
}
|
|
sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
|
|
}
|
|
|
|
#else /* !BB_MMU */
|
|
|
|
static void re_execute_shell(char ***to_free, const char *s, char *g_argv0, char **g_argv) NORETURN;
|
|
static void re_execute_shell(char ***to_free, const char *s, char *g_argv0, char **g_argv)
|
|
{
|
|
char param_buf[sizeof("-$%x:%x:%x:%x") + sizeof(unsigned) * 4];
|
|
char *heredoc_argv[4];
|
|
struct variable *cur;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
struct function *funcp;
|
|
#endif
|
|
char **argv, **pp;
|
|
unsigned cnt;
|
|
|
|
if (!g_argv0) { /* heredoc */
|
|
argv = heredoc_argv;
|
|
argv[0] = (char *) G.argv0_for_re_execing;
|
|
argv[1] = (char *) "-<";
|
|
argv[2] = (char *) s;
|
|
argv[3] = NULL;
|
|
pp = &argv[3]; /* used as pointer to empty environment */
|
|
goto do_exec;
|
|
}
|
|
|
|
sprintf(param_buf, "-$%x:%x:%x" IF_HUSH_LOOPS(":%x")
|
|
, (unsigned) G.root_pid
|
|
, (unsigned) G.last_bg_pid
|
|
, (unsigned) G.last_exitcode
|
|
IF_HUSH_LOOPS(, G.depth_of_loop)
|
|
);
|
|
/* 1:hush 2:-$<pid>:<pid>:<exitcode>:<depth> <vars...> <funcs...>
|
|
* 3:-c 4:<cmd> 5:<arg0> <argN...> 6:NULL
|
|
*/
|
|
cnt = 6;
|
|
for (cur = G.top_var; cur; cur = cur->next) {
|
|
if (!cur->flg_export || cur->flg_read_only)
|
|
cnt += 2;
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
for (funcp = G.top_func; funcp; funcp = funcp->next)
|
|
cnt += 3;
|
|
#endif
|
|
pp = g_argv;
|
|
while (*pp++)
|
|
cnt++;
|
|
*to_free = argv = pp = xzalloc(sizeof(argv[0]) * cnt);
|
|
*pp++ = (char *) G.argv0_for_re_execing;
|
|
*pp++ = param_buf;
|
|
for (cur = G.top_var; cur; cur = cur->next) {
|
|
if (cur->varstr == hush_version_str)
|
|
continue;
|
|
if (cur->flg_read_only) {
|
|
*pp++ = (char *) "-R";
|
|
*pp++ = cur->varstr;
|
|
} else if (!cur->flg_export) {
|
|
*pp++ = (char *) "-V";
|
|
*pp++ = cur->varstr;
|
|
}
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
for (funcp = G.top_func; funcp; funcp = funcp->next) {
|
|
*pp++ = (char *) "-F";
|
|
*pp++ = funcp->name;
|
|
*pp++ = funcp->body_as_string;
|
|
}
|
|
#endif
|
|
/* We can pass activated traps here. Say, -Tnn:trap_string
|
|
*
|
|
* However, POSIX says that subshells reset signals with traps
|
|
* to SIG_DFL.
|
|
* I tested bash-3.2 and it not only does that with true subshells
|
|
* of the form ( list ), but with any forked children shells.
|
|
* I set trap "echo W" WINCH; and then tried:
|
|
*
|
|
* { echo 1; sleep 20; echo 2; } &
|
|
* while true; do echo 1; sleep 20; echo 2; break; done &
|
|
* true | { echo 1; sleep 20; echo 2; } | cat
|
|
*
|
|
* In all these cases sending SIGWINCH to the child shell
|
|
* did not run the trap. If I add trap "echo V" WINCH;
|
|
* _inside_ group (just before echo 1), it works.
|
|
*
|
|
* I conclude it means we don't need to pass active traps here.
|
|
* exec syscall below resets them to SIG_DFL for us.
|
|
*/
|
|
*pp++ = (char *) "-c";
|
|
*pp++ = (char *) s;
|
|
*pp++ = g_argv0;
|
|
while (*g_argv)
|
|
*pp++ = *g_argv++;
|
|
/* *pp = NULL; - is already there */
|
|
pp = environ;
|
|
|
|
do_exec:
|
|
debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
|
|
sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
|
|
execve(bb_busybox_exec_path, argv, pp);
|
|
/* Fallback. Useful for init=/bin/hush usage etc */
|
|
if (argv[0][0] == '/')
|
|
execve(argv[0], argv, pp);
|
|
xfunc_error_retval = 127;
|
|
bb_error_msg_and_die("can't re-execute the shell");
|
|
}
|
|
#endif /* !BB_MMU */
|
|
|
|
|
|
static void setup_heredoc(struct redir_struct *redir)
|
|
{
|
|
struct fd_pair pair;
|
|
pid_t pid;
|
|
int len, written;
|
|
/* the _body_ of heredoc (misleading field name) */
|
|
const char *heredoc = redir->rd_filename;
|
|
char *expanded;
|
|
#if !BB_MMU
|
|
char **to_free;
|
|
#endif
|
|
|
|
expanded = NULL;
|
|
if (!(redir->rd_dup & HEREDOC_QUOTED)) {
|
|
expanded = expand_pseudo_dquoted(heredoc);
|
|
if (expanded)
|
|
heredoc = expanded;
|
|
}
|
|
len = strlen(heredoc);
|
|
|
|
close(redir->rd_fd); /* often saves dup2+close in xmove_fd */
|
|
xpiped_pair(pair);
|
|
xmove_fd(pair.rd, redir->rd_fd);
|
|
|
|
/* Try writing without forking. Newer kernels have
|
|
* dynamically growing pipes. Must use non-blocking write! */
|
|
ndelay_on(pair.wr);
|
|
while (1) {
|
|
written = write(pair.wr, heredoc, len);
|
|
if (written <= 0)
|
|
break;
|
|
len -= written;
|
|
if (len == 0) {
|
|
close(pair.wr);
|
|
free(expanded);
|
|
return;
|
|
}
|
|
heredoc += written;
|
|
}
|
|
ndelay_off(pair.wr);
|
|
|
|
/* Okay, pipe buffer was not big enough */
|
|
/* Note: we must not create a stray child (bastard? :)
|
|
* for the unsuspecting parent process. Child creates a grandchild
|
|
* and exits before parent execs the process which consumes heredoc
|
|
* (that exec happens after we return from this function) */
|
|
#if !BB_MMU
|
|
to_free = NULL;
|
|
#endif
|
|
pid = vfork();
|
|
if (pid < 0)
|
|
bb_perror_msg_and_die("vfork");
|
|
if (pid == 0) {
|
|
/* child */
|
|
disable_restore_tty_pgrp_on_exit();
|
|
pid = BB_MMU ? fork() : vfork();
|
|
if (pid < 0)
|
|
bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
|
|
if (pid != 0)
|
|
_exit(0);
|
|
/* grandchild */
|
|
close(redir->rd_fd); /* read side of the pipe */
|
|
#if BB_MMU
|
|
full_write(pair.wr, heredoc, len); /* may loop or block */
|
|
_exit(0);
|
|
#else
|
|
/* Delegate blocking writes to another process */
|
|
xmove_fd(pair.wr, STDOUT_FILENO);
|
|
re_execute_shell(&to_free, heredoc, NULL, NULL);
|
|
#endif
|
|
}
|
|
/* parent */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in setup_heredoc: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
#endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
#if !BB_MMU
|
|
free(to_free);
|
|
#endif
|
|
close(pair.wr);
|
|
free(expanded);
|
|
wait(NULL); /* wait till child has died */
|
|
}
|
|
|
|
/* squirrel != NULL means we squirrel away copies of stdin, stdout,
|
|
* and stderr if they are redirected. */
|
|
static int setup_redirects(struct command *prog, int squirrel[])
|
|
{
|
|
int openfd, mode;
|
|
struct redir_struct *redir;
|
|
|
|
for (redir = prog->redirects; redir; redir = redir->next) {
|
|
if (redir->rd_type == REDIRECT_HEREDOC2) {
|
|
/* rd_fd<<HERE case */
|
|
if (squirrel && redir->rd_fd < 3
|
|
&& squirrel[redir->rd_fd] < 0
|
|
) {
|
|
squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
|
}
|
|
/* for REDIRECT_HEREDOC2, rd_filename holds _contents_
|
|
* of the heredoc */
|
|
debug_printf_parse("set heredoc '%s'\n",
|
|
redir->rd_filename);
|
|
setup_heredoc(redir);
|
|
continue;
|
|
}
|
|
|
|
if (redir->rd_dup == REDIRFD_TO_FILE) {
|
|
/* rd_fd<*>file case (<*> is <,>,>>,<>) */
|
|
char *p;
|
|
if (redir->rd_filename == NULL) {
|
|
/* Something went wrong in the parse.
|
|
* Pretend it didn't happen */
|
|
bb_error_msg("bug in redirect parse");
|
|
continue;
|
|
}
|
|
mode = redir_table[redir->rd_type].mode;
|
|
p = expand_string_to_string(redir->rd_filename);
|
|
openfd = open_or_warn(p, mode);
|
|
free(p);
|
|
if (openfd < 0) {
|
|
/* this could get lost if stderr has been redirected, but
|
|
* bash and ash both lose it as well (though zsh doesn't!) */
|
|
//what the above comment tries to say?
|
|
return 1;
|
|
}
|
|
} else {
|
|
/* rd_fd<*>rd_dup or rd_fd<*>- cases */
|
|
openfd = redir->rd_dup;
|
|
}
|
|
|
|
if (openfd != redir->rd_fd) {
|
|
if (squirrel && redir->rd_fd < 3
|
|
&& squirrel[redir->rd_fd] < 0
|
|
) {
|
|
squirrel[redir->rd_fd] = dup(redir->rd_fd);
|
|
}
|
|
if (openfd == REDIRFD_CLOSE) {
|
|
/* "n>-" means "close me" */
|
|
close(redir->rd_fd);
|
|
} else {
|
|
xdup2(openfd, redir->rd_fd);
|
|
if (redir->rd_dup == REDIRFD_TO_FILE)
|
|
close(openfd);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void restore_redirects(int squirrel[])
|
|
{
|
|
int i, fd;
|
|
for (i = 0; i < 3; i++) {
|
|
fd = squirrel[i];
|
|
if (fd != -1) {
|
|
/* We simply die on error */
|
|
xmove_fd(fd, i);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static void free_pipe_list(struct pipe *head);
|
|
|
|
/* Return code is the exit status of the pipe */
|
|
static void free_pipe(struct pipe *pi)
|
|
{
|
|
char **p;
|
|
struct command *command;
|
|
struct redir_struct *r, *rnext;
|
|
int a, i;
|
|
|
|
if (pi->stopped_cmds > 0) /* why? */
|
|
return;
|
|
debug_printf_clean("run pipe: (pid %d)\n", getpid());
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
command = &pi->cmds[i];
|
|
debug_printf_clean(" command %d:\n", i);
|
|
if (command->argv) {
|
|
for (a = 0, p = command->argv; *p; a++, p++) {
|
|
debug_printf_clean(" argv[%d] = %s\n", a, *p);
|
|
}
|
|
free_strings(command->argv);
|
|
command->argv = NULL;
|
|
}
|
|
/* not "else if": on syntax error, we may have both! */
|
|
if (command->group) {
|
|
debug_printf_clean(" begin group (grp_type:%d)\n",
|
|
command->grp_type);
|
|
free_pipe_list(command->group);
|
|
debug_printf_clean(" end group\n");
|
|
command->group = NULL;
|
|
}
|
|
/* else is crucial here.
|
|
* If group != NULL, child_func is meaningless */
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else if (command->child_func) {
|
|
debug_printf_exec("cmd %p releases child func at %p\n", command, command->child_func);
|
|
command->child_func->parent_cmd = NULL;
|
|
}
|
|
#endif
|
|
#if !BB_MMU
|
|
free(command->group_as_string);
|
|
command->group_as_string = NULL;
|
|
#endif
|
|
for (r = command->redirects; r; r = rnext) {
|
|
debug_printf_clean(" redirect %d%s",
|
|
r->rd_fd, redir_table[r->rd_type].descrip);
|
|
/* guard against the case >$FOO, where foo is unset or blank */
|
|
if (r->rd_filename) {
|
|
debug_printf_clean(" fname:'%s'\n", r->rd_filename);
|
|
free(r->rd_filename);
|
|
r->rd_filename = NULL;
|
|
}
|
|
debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
|
|
rnext = r->next;
|
|
free(r);
|
|
}
|
|
command->redirects = NULL;
|
|
}
|
|
free(pi->cmds); /* children are an array, they get freed all at once */
|
|
pi->cmds = NULL;
|
|
#if ENABLE_HUSH_JOB
|
|
free(pi->cmdtext);
|
|
pi->cmdtext = NULL;
|
|
#endif
|
|
}
|
|
|
|
static void free_pipe_list(struct pipe *head)
|
|
{
|
|
struct pipe *pi, *next;
|
|
|
|
for (pi = head; pi; pi = next) {
|
|
#if HAS_KEYWORDS
|
|
debug_printf_clean(" pipe reserved word %d\n", pi->res_word);
|
|
#endif
|
|
free_pipe(pi);
|
|
debug_printf_clean("pipe followup code %d\n", pi->followup);
|
|
next = pi->next;
|
|
/*pi->next = NULL;*/
|
|
free(pi);
|
|
}
|
|
}
|
|
|
|
|
|
static int run_list(struct pipe *pi);
|
|
#if BB_MMU
|
|
#define parse_stream(pstring, input, end_trigger) \
|
|
parse_stream(input, end_trigger)
|
|
#endif
|
|
static struct pipe *parse_stream(char **pstring,
|
|
struct in_str *input,
|
|
int end_trigger);
|
|
static void parse_and_run_string(const char *s);
|
|
|
|
|
|
static char *find_in_path(const char *arg)
|
|
{
|
|
char *ret = NULL;
|
|
const char *PATH = get_local_var_value("PATH");
|
|
|
|
if (!PATH)
|
|
return NULL;
|
|
|
|
while (1) {
|
|
const char *end = strchrnul(PATH, ':');
|
|
int sz = end - PATH; /* must be int! */
|
|
|
|
free(ret);
|
|
if (sz != 0) {
|
|
ret = xasprintf("%.*s/%s", sz, PATH, arg);
|
|
} else {
|
|
/* We have xxx::yyyy in $PATH,
|
|
* it means "use current dir" */
|
|
ret = xstrdup(arg);
|
|
}
|
|
if (access(ret, F_OK) == 0)
|
|
break;
|
|
|
|
if (*end == '\0') {
|
|
free(ret);
|
|
return NULL;
|
|
}
|
|
PATH = end + 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct built_in_command* find_builtin(const char *name)
|
|
{
|
|
const struct built_in_command *x;
|
|
for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
|
|
if (strcmp(name, x->cmd) != 0)
|
|
continue;
|
|
debug_printf_exec("found builtin '%s'\n", name);
|
|
return x;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static const struct function *find_function(const char *name)
|
|
{
|
|
const struct function *funcp = G.top_func;
|
|
while (funcp) {
|
|
if (strcmp(name, funcp->name) == 0) {
|
|
break;
|
|
}
|
|
funcp = funcp->next;
|
|
}
|
|
if (funcp)
|
|
debug_printf_exec("found function '%s'\n", name);
|
|
return funcp;
|
|
}
|
|
|
|
/* Note: takes ownership on name ptr */
|
|
static struct function *new_function(char *name)
|
|
{
|
|
struct function *funcp;
|
|
struct function **funcpp = &G.top_func;
|
|
|
|
while ((funcp = *funcpp) != NULL) {
|
|
struct command *cmd;
|
|
|
|
if (strcmp(funcp->name, name) != 0) {
|
|
funcpp = &funcp->next;
|
|
continue;
|
|
}
|
|
|
|
cmd = funcp->parent_cmd;
|
|
debug_printf_exec("func %p parent_cmd %p\n", funcp, cmd);
|
|
if (!cmd) {
|
|
debug_printf_exec("freeing & replacing function '%s'\n", funcp->name);
|
|
free(funcp->name);
|
|
/* Note: if !funcp->body, do not free body_as_string!
|
|
* This is a special case of "-F name body" function:
|
|
* body_as_string was not malloced! */
|
|
if (funcp->body) {
|
|
free_pipe_list(funcp->body);
|
|
# if !BB_MMU
|
|
free(funcp->body_as_string);
|
|
# endif
|
|
}
|
|
} else {
|
|
debug_printf_exec("reinserting in tree & replacing function '%s'\n", funcp->name);
|
|
cmd->argv[0] = funcp->name;
|
|
cmd->group = funcp->body;
|
|
# if !BB_MMU
|
|
cmd->group_as_string = funcp->body_as_string;
|
|
# endif
|
|
}
|
|
goto skip;
|
|
}
|
|
debug_printf_exec("remembering new function '%s'\n", name);
|
|
funcp = *funcpp = xzalloc(sizeof(*funcp));
|
|
/*funcp->next = NULL;*/
|
|
skip:
|
|
funcp->name = name;
|
|
return funcp;
|
|
}
|
|
|
|
static void unset_func(const char *name)
|
|
{
|
|
struct function *funcp;
|
|
struct function **funcpp = &G.top_func;
|
|
|
|
while ((funcp = *funcpp) != NULL) {
|
|
if (strcmp(funcp->name, name) == 0) {
|
|
*funcpp = funcp->next;
|
|
/* funcp is unlinked now, deleting it.
|
|
* Note: if !funcp->body, the function was created by
|
|
* "-F name body", do not free ->body_as_string
|
|
* and ->name as they were not malloced. */
|
|
if (funcp->body) {
|
|
free_pipe_list(funcp->body);
|
|
free(funcp->name);
|
|
# if !BB_MMU
|
|
free(funcp->body_as_string);
|
|
# endif
|
|
}
|
|
free(funcp);
|
|
break;
|
|
}
|
|
funcpp = &funcp->next;
|
|
}
|
|
}
|
|
|
|
# if BB_MMU
|
|
#define exec_function(nommu_save, funcp, argv) \
|
|
exec_function(funcp, argv)
|
|
# endif
|
|
static void exec_function(nommu_save_t *nommu_save,
|
|
const struct function *funcp,
|
|
char **argv) NORETURN;
|
|
static void exec_function(nommu_save_t *nommu_save,
|
|
const struct function *funcp,
|
|
char **argv)
|
|
{
|
|
# if BB_MMU
|
|
int n = 1;
|
|
|
|
argv[0] = G.global_argv[0];
|
|
G.global_argv = argv;
|
|
while (*++argv)
|
|
n++;
|
|
G.global_argc = n;
|
|
/* On MMU, funcp->body is always non-NULL */
|
|
n = run_list(funcp->body);
|
|
fflush(NULL);
|
|
_exit(n);
|
|
# else
|
|
re_execute_shell(&nommu_save->argv_from_re_execing,
|
|
funcp->body_as_string,
|
|
G.global_argv[0],
|
|
argv + 1);
|
|
# endif
|
|
}
|
|
|
|
static int run_function(const struct function *funcp, char **argv)
|
|
{
|
|
int rc;
|
|
save_arg_t sv;
|
|
smallint sv_flg;
|
|
|
|
save_and_replace_G_args(&sv, argv);
|
|
/* "we are in function, ok to use return" */
|
|
sv_flg = G.flag_return_in_progress;
|
|
G.flag_return_in_progress = -1;
|
|
|
|
/* On MMU, funcp->body is always non-NULL */
|
|
# if !BB_MMU
|
|
if (!funcp->body) {
|
|
/* Function defined by -F */
|
|
parse_and_run_string(funcp->body_as_string);
|
|
rc = G.last_exitcode;
|
|
} else
|
|
# endif
|
|
{
|
|
rc = run_list(funcp->body);
|
|
}
|
|
|
|
G.flag_return_in_progress = sv_flg;
|
|
restore_G_args(&sv, argv);
|
|
|
|
return rc;
|
|
}
|
|
#endif /* ENABLE_HUSH_FUNCTIONS */
|
|
|
|
|
|
#if BB_MMU
|
|
#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
|
|
pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
|
|
#define pseudo_exec(nommu_save, command, argv_expanded) \
|
|
pseudo_exec(command, argv_expanded)
|
|
#endif
|
|
|
|
/* Called after [v]fork() in run_pipe, or from builtin_exec.
|
|
* Never returns.
|
|
* Don't exit() here. If you don't exec, use _exit instead.
|
|
* The at_exit handlers apparently confuse the calling process,
|
|
* in particular stdin handling. Not sure why? -- because of vfork! (vda) */
|
|
static void pseudo_exec_argv(nommu_save_t *nommu_save,
|
|
char **argv, int assignment_cnt,
|
|
char **argv_expanded) NORETURN;
|
|
static void pseudo_exec_argv(nommu_save_t *nommu_save,
|
|
char **argv, int assignment_cnt,
|
|
char **argv_expanded)
|
|
{
|
|
char **new_env;
|
|
|
|
/* Case when we are here: ... | var=val | ... */
|
|
if (!argv[assignment_cnt])
|
|
_exit(EXIT_SUCCESS);
|
|
|
|
new_env = expand_assignments(argv, assignment_cnt);
|
|
#if BB_MMU
|
|
set_vars_and_save_old(new_env);
|
|
free(new_env); /* optional */
|
|
/* we can also destroy set_vars_and_save_old's return value,
|
|
* to save memory */
|
|
#else
|
|
nommu_save->new_env = new_env;
|
|
nommu_save->old_vars = set_vars_and_save_old(new_env);
|
|
#endif
|
|
if (argv_expanded) {
|
|
argv = argv_expanded;
|
|
} else {
|
|
argv = expand_strvec_to_strvec(argv + assignment_cnt);
|
|
#if !BB_MMU
|
|
nommu_save->argv = argv;
|
|
#endif
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
|
if (strchr(argv[0], '/') != NULL)
|
|
goto skip;
|
|
#endif
|
|
|
|
/* On NOMMU, we must never block!
|
|
* Example: { sleep 99999 | read line } & echo Ok
|
|
* read builtin will block on read syscall, leaving parent blocked
|
|
* in vfork. Therefore we can't do this:
|
|
*/
|
|
#if BB_MMU
|
|
/* Check if the command matches any of the builtins.
|
|
* Depending on context, this might be redundant. But it's
|
|
* easier to waste a few CPU cycles than it is to figure out
|
|
* if this is one of those cases.
|
|
*/
|
|
{
|
|
int rcode;
|
|
const struct built_in_command *x = find_builtin(argv[0]);
|
|
if (x) {
|
|
rcode = x->function(argv);
|
|
fflush(NULL);
|
|
_exit(rcode);
|
|
}
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
/* Check if the command matches any functions */
|
|
{
|
|
const struct function *funcp = find_function(argv[0]);
|
|
if (funcp) {
|
|
exec_function(nommu_save, funcp, argv);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
/* Check if the command matches any busybox applets */
|
|
{
|
|
int a = find_applet_by_name(argv[0]);
|
|
if (a >= 0) {
|
|
# if BB_MMU /* see above why on NOMMU it is not allowed */
|
|
if (APPLET_IS_NOEXEC(a)) {
|
|
debug_printf_exec("running applet '%s'\n", argv[0]);
|
|
run_applet_no_and_exit(a, argv);
|
|
}
|
|
# endif
|
|
/* Re-exec ourselves */
|
|
debug_printf_exec("re-execing applet '%s'\n", argv[0]);
|
|
sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
|
|
execv(bb_busybox_exec_path, argv);
|
|
/* If they called chroot or otherwise made the binary no longer
|
|
* executable, fall through */
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE || BB_MMU
|
|
skip:
|
|
#endif
|
|
debug_printf_exec("execing '%s'\n", argv[0]);
|
|
sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
|
|
execvp(argv[0], argv);
|
|
bb_perror_msg("can't execute '%s'", argv[0]);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Called after [v]fork() in run_pipe
|
|
*/
|
|
static void pseudo_exec(nommu_save_t *nommu_save,
|
|
struct command *command,
|
|
char **argv_expanded) NORETURN;
|
|
static void pseudo_exec(nommu_save_t *nommu_save,
|
|
struct command *command,
|
|
char **argv_expanded)
|
|
{
|
|
if (command->argv) {
|
|
pseudo_exec_argv(nommu_save, command->argv,
|
|
command->assignment_cnt, argv_expanded);
|
|
}
|
|
|
|
if (command->group) {
|
|
/* Cases when we are here:
|
|
* ( list )
|
|
* { list } &
|
|
* ... | ( list ) | ...
|
|
* ... | { list } | ...
|
|
*/
|
|
#if BB_MMU
|
|
int rcode;
|
|
debug_printf_exec("pseudo_exec: run_list\n");
|
|
reset_traps_to_defaults();
|
|
rcode = run_list(command->group);
|
|
/* OK to leak memory by not calling free_pipe_list,
|
|
* since this process is about to exit */
|
|
_exit(rcode);
|
|
#else
|
|
re_execute_shell(&nommu_save->argv_from_re_execing,
|
|
command->group_as_string,
|
|
G.global_argv[0],
|
|
G.global_argv + 1);
|
|
#endif
|
|
}
|
|
|
|
/* Case when we are here: ... | >file */
|
|
debug_printf_exec("pseudo_exec'ed null command\n");
|
|
_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static const char *get_cmdtext(struct pipe *pi)
|
|
{
|
|
char **argv;
|
|
char *p;
|
|
int len;
|
|
|
|
/* This is subtle. ->cmdtext is created only on first backgrounding.
|
|
* (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
|
|
* On subsequent bg argv is trashed, but we won't use it */
|
|
if (pi->cmdtext)
|
|
return pi->cmdtext;
|
|
argv = pi->cmds[0].argv;
|
|
if (!argv || !argv[0]) {
|
|
pi->cmdtext = xzalloc(1);
|
|
return pi->cmdtext;
|
|
}
|
|
|
|
len = 0;
|
|
do {
|
|
len += strlen(*argv) + 1;
|
|
} while (*++argv);
|
|
p = xmalloc(len);
|
|
pi->cmdtext = p;
|
|
argv = pi->cmds[0].argv;
|
|
do {
|
|
len = strlen(*argv);
|
|
memcpy(p, *argv, len);
|
|
p += len;
|
|
*p++ = ' ';
|
|
} while (*++argv);
|
|
p[-1] = '\0';
|
|
return pi->cmdtext;
|
|
}
|
|
|
|
static void insert_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *job, **jobp;
|
|
int i;
|
|
|
|
/* Linear search for the ID of the job to use */
|
|
pi->jobid = 1;
|
|
for (job = G.job_list; job; job = job->next)
|
|
if (job->jobid >= pi->jobid)
|
|
pi->jobid = job->jobid + 1;
|
|
|
|
/* Add job to the list of running jobs */
|
|
jobp = &G.job_list;
|
|
while ((job = *jobp) != NULL)
|
|
jobp = &job->next;
|
|
job = *jobp = xmalloc(sizeof(*job));
|
|
|
|
*job = *pi; /* physical copy */
|
|
job->next = NULL;
|
|
job->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
|
|
/* Cannot copy entire pi->cmds[] vector! This causes double frees */
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
job->cmds[i].pid = pi->cmds[i].pid;
|
|
/* all other fields are not used and stay zero */
|
|
}
|
|
job->cmdtext = xstrdup(get_cmdtext(pi));
|
|
|
|
if (G_interactive_fd)
|
|
printf("[%d] %d %s\n", job->jobid, job->cmds[0].pid, job->cmdtext);
|
|
/* Last command's pid goes to $! */
|
|
G.last_bg_pid = job->cmds[job->num_cmds - 1].pid;
|
|
G.last_jobid = job->jobid;
|
|
}
|
|
|
|
static void remove_bg_job(struct pipe *pi)
|
|
{
|
|
struct pipe *prev_pipe;
|
|
|
|
if (pi == G.job_list) {
|
|
G.job_list = pi->next;
|
|
} else {
|
|
prev_pipe = G.job_list;
|
|
while (prev_pipe->next != pi)
|
|
prev_pipe = prev_pipe->next;
|
|
prev_pipe->next = pi->next;
|
|
}
|
|
if (G.job_list)
|
|
G.last_jobid = G.job_list->jobid;
|
|
else
|
|
G.last_jobid = 0;
|
|
}
|
|
|
|
/* Remove a backgrounded job */
|
|
static void delete_finished_bg_job(struct pipe *pi)
|
|
{
|
|
remove_bg_job(pi);
|
|
pi->stopped_cmds = 0;
|
|
free_pipe(pi);
|
|
free(pi);
|
|
}
|
|
#endif /* JOB */
|
|
|
|
/* Check to see if any processes have exited -- if they
|
|
* have, figure out why and see if a job has completed */
|
|
static int checkjobs(struct pipe* fg_pipe)
|
|
{
|
|
int attributes;
|
|
int status;
|
|
#if ENABLE_HUSH_JOB
|
|
struct pipe *pi;
|
|
#endif
|
|
pid_t childpid;
|
|
int rcode = 0;
|
|
|
|
debug_printf_jobs("checkjobs %p\n", fg_pipe);
|
|
|
|
attributes = WUNTRACED;
|
|
if (fg_pipe == NULL)
|
|
attributes |= WNOHANG;
|
|
|
|
errno = 0;
|
|
#if ENABLE_HUSH_FAST
|
|
if (G.handled_SIGCHLD == G.count_SIGCHLD) {
|
|
//bb_error_msg("[%d] checkjobs: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d children?:%d fg_pipe:%p",
|
|
//getpid(), G.count_SIGCHLD, G.handled_SIGCHLD, G.we_have_children, fg_pipe);
|
|
/* There was neither fork nor SIGCHLD since last waitpid */
|
|
/* Avoid doing waitpid syscall if possible */
|
|
if (!G.we_have_children) {
|
|
errno = ECHILD;
|
|
return -1;
|
|
}
|
|
if (fg_pipe == NULL) { /* is WNOHANG set? */
|
|
/* We have children, but they did not exit
|
|
* or stop yet (we saw no SIGCHLD) */
|
|
return 0;
|
|
}
|
|
/* else: !WNOHANG, waitpid will block, can't short-circuit */
|
|
}
|
|
#endif
|
|
|
|
/* Do we do this right?
|
|
* bash-3.00# sleep 20 | false
|
|
* <ctrl-Z pressed>
|
|
* [3]+ Stopped sleep 20 | false
|
|
* bash-3.00# echo $?
|
|
* 1 <========== bg pipe is not fully done, but exitcode is already known!
|
|
* [hush 1.14.0: yes we do it right]
|
|
*/
|
|
wait_more:
|
|
while (1) {
|
|
int i;
|
|
int dead;
|
|
|
|
#if ENABLE_HUSH_FAST
|
|
i = G.count_SIGCHLD;
|
|
#endif
|
|
childpid = waitpid(-1, &status, attributes);
|
|
if (childpid <= 0) {
|
|
if (childpid && errno != ECHILD)
|
|
bb_perror_msg("waitpid");
|
|
#if ENABLE_HUSH_FAST
|
|
else { /* Until next SIGCHLD, waitpid's are useless */
|
|
G.we_have_children = (childpid == 0);
|
|
G.handled_SIGCHLD = i;
|
|
//bb_error_msg("[%d] checkjobs: waitpid returned <= 0, G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
}
|
|
#endif
|
|
break;
|
|
}
|
|
dead = WIFEXITED(status) || WIFSIGNALED(status);
|
|
|
|
#if DEBUG_JOBS
|
|
if (WIFSTOPPED(status))
|
|
debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
|
|
childpid, WSTOPSIG(status), WEXITSTATUS(status));
|
|
if (WIFSIGNALED(status))
|
|
debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
|
|
childpid, WTERMSIG(status), WEXITSTATUS(status));
|
|
if (WIFEXITED(status))
|
|
debug_printf_jobs("pid %d exited, exitcode %d\n",
|
|
childpid, WEXITSTATUS(status));
|
|
#endif
|
|
/* Were we asked to wait for fg pipe? */
|
|
if (fg_pipe) {
|
|
for (i = 0; i < fg_pipe->num_cmds; i++) {
|
|
debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
|
|
if (fg_pipe->cmds[i].pid != childpid)
|
|
continue;
|
|
if (dead) {
|
|
fg_pipe->cmds[i].pid = 0;
|
|
fg_pipe->alive_cmds--;
|
|
if (i == fg_pipe->num_cmds - 1) {
|
|
/* last process gives overall exitstatus */
|
|
/* Note: is WIFSIGNALED, WEXITSTATUS = sig + 128 */
|
|
rcode = WEXITSTATUS(status);
|
|
IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
|
|
/* bash prints killing signal's name for *last*
|
|
* process in pipe (prints just newline for SIGINT).
|
|
* Mimic this. Example: "sleep 5" + ^\
|
|
*/
|
|
if (WIFSIGNALED(status)) {
|
|
int sig = WTERMSIG(status);
|
|
printf("%s\n", sig == SIGINT ? "" : get_signame(sig));
|
|
}
|
|
}
|
|
} else {
|
|
fg_pipe->cmds[i].is_stopped = 1;
|
|
fg_pipe->stopped_cmds++;
|
|
}
|
|
debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
|
|
fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
|
|
if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) {
|
|
/* All processes in fg pipe have exited or stopped */
|
|
/* Note: *non-interactive* bash does not continue if all processes in fg pipe
|
|
* are stopped. Testcase: "cat | cat" in a script (not on command line!)
|
|
* and "killall -STOP cat" */
|
|
if (G_interactive_fd) {
|
|
#if ENABLE_HUSH_JOB
|
|
if (fg_pipe->alive_cmds)
|
|
insert_bg_job(fg_pipe);
|
|
#endif
|
|
return rcode;
|
|
}
|
|
}
|
|
/* There are still running processes in the fg pipe */
|
|
goto wait_more; /* do waitpid again */
|
|
}
|
|
/* it wasnt fg_pipe, look for process in bg pipes */
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* We asked to wait for bg or orphaned children */
|
|
/* No need to remember exitcode in this case */
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
if (pi->cmds[i].pid == childpid)
|
|
goto found_pi_and_prognum;
|
|
}
|
|
}
|
|
/* Happens when shell is used as init process (init=/bin/sh) */
|
|
debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
|
|
continue; /* do waitpid again */
|
|
|
|
found_pi_and_prognum:
|
|
if (dead) {
|
|
/* child exited */
|
|
pi->cmds[i].pid = 0;
|
|
pi->alive_cmds--;
|
|
if (!pi->alive_cmds) {
|
|
if (G_interactive_fd)
|
|
printf(JOB_STATUS_FORMAT, pi->jobid,
|
|
"Done", pi->cmdtext);
|
|
delete_finished_bg_job(pi);
|
|
}
|
|
} else {
|
|
/* child stopped */
|
|
pi->cmds[i].is_stopped = 1;
|
|
pi->stopped_cmds++;
|
|
}
|
|
#endif
|
|
} /* while (waitpid succeeds)... */
|
|
|
|
return rcode;
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
|
|
{
|
|
pid_t p;
|
|
int rcode = checkjobs(fg_pipe);
|
|
if (G_saved_tty_pgrp) {
|
|
/* Job finished, move the shell to the foreground */
|
|
p = getpgrp(); /* our process group id */
|
|
debug_printf_jobs("fg'ing ourself: getpgrp()=%d\n", (int)p);
|
|
tcsetpgrp(G_interactive_fd, p);
|
|
}
|
|
return rcode;
|
|
}
|
|
#endif
|
|
|
|
/* Start all the jobs, but don't wait for anything to finish.
|
|
* See checkjobs().
|
|
*
|
|
* Return code is normally -1, when the caller has to wait for children
|
|
* to finish to determine the exit status of the pipe. If the pipe
|
|
* is a simple builtin command, however, the action is done by the
|
|
* time run_pipe returns, and the exit code is provided as the
|
|
* return value.
|
|
*
|
|
* Returns -1 only if started some children. IOW: we have to
|
|
* mask out retvals of builtins etc with 0xff!
|
|
*
|
|
* The only case when we do not need to [v]fork is when the pipe
|
|
* is single, non-backgrounded, non-subshell command. Examples:
|
|
* cmd ; ... { list } ; ...
|
|
* cmd && ... { list } && ...
|
|
* cmd || ... { list } || ...
|
|
* If it is, then we can run cmd as a builtin, NOFORK [do we do this?],
|
|
* or (if SH_STANDALONE) an applet, and we can run the { list }
|
|
* with run_list. If it isn't one of these, we fork and exec cmd.
|
|
*
|
|
* Cases when we must fork:
|
|
* non-single: cmd | cmd
|
|
* backgrounded: cmd & { list } &
|
|
* subshell: ( list ) [&]
|
|
*/
|
|
static int run_pipe(struct pipe *pi)
|
|
{
|
|
static const char *const null_ptr = NULL;
|
|
int i;
|
|
int nextin;
|
|
struct command *command;
|
|
char **argv_expanded;
|
|
char **argv;
|
|
char *p;
|
|
/* it is not always needed, but we aim to smaller code */
|
|
int squirrel[] = { -1, -1, -1 };
|
|
int rcode;
|
|
|
|
debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
|
|
debug_enter();
|
|
|
|
IF_HUSH_JOB(pi->pgrp = -1;)
|
|
pi->stopped_cmds = 0;
|
|
command = &(pi->cmds[0]);
|
|
argv_expanded = NULL;
|
|
|
|
if (pi->num_cmds != 1
|
|
|| pi->followup == PIPE_BG
|
|
|| command->grp_type == GRP_SUBSHELL
|
|
) {
|
|
goto must_fork;
|
|
}
|
|
|
|
pi->alive_cmds = 1;
|
|
|
|
debug_printf_exec(": group:%p argv:'%s'\n",
|
|
command->group, command->argv ? command->argv[0] : "NONE");
|
|
|
|
if (command->group) {
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (command->grp_type == GRP_FUNCTION) {
|
|
/* "executing" func () { list } */
|
|
struct function *funcp;
|
|
|
|
funcp = new_function(command->argv[0]);
|
|
/* funcp->name is already set to argv[0] */
|
|
funcp->body = command->group;
|
|
# if !BB_MMU
|
|
funcp->body_as_string = command->group_as_string;
|
|
command->group_as_string = NULL;
|
|
# endif
|
|
command->group = NULL;
|
|
command->argv[0] = NULL;
|
|
debug_printf_exec("cmd %p has child func at %p\n", command, funcp);
|
|
funcp->parent_cmd = command;
|
|
command->child_func = funcp;
|
|
|
|
debug_printf_exec("run_pipe: return EXIT_SUCCESS\n");
|
|
debug_leave();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
/* { list } */
|
|
debug_printf("non-subshell group\n");
|
|
rcode = 1; /* exitcode if redir failed */
|
|
if (setup_redirects(command, squirrel) == 0) {
|
|
debug_printf_exec(": run_list\n");
|
|
rcode = run_list(command->group) & 0xff;
|
|
}
|
|
restore_redirects(squirrel);
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe: return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
argv = command->argv ? command->argv : (char **) &null_ptr;
|
|
{
|
|
const struct built_in_command *x;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
const struct function *funcp;
|
|
#else
|
|
enum { funcp = 0 };
|
|
#endif
|
|
char **new_env = NULL;
|
|
struct variable *old_vars = NULL;
|
|
|
|
if (argv[command->assignment_cnt] == NULL) {
|
|
/* Assignments, but no command */
|
|
/* Ensure redirects take effect. Try "a=t >file" */
|
|
rcode = setup_redirects(command, squirrel);
|
|
restore_redirects(squirrel);
|
|
/* Set shell variables */
|
|
while (*argv) {
|
|
p = expand_string_to_string(*argv);
|
|
debug_printf_exec("set shell var:'%s'->'%s'\n",
|
|
*argv, p);
|
|
set_local_var(p, 0, 0);
|
|
argv++;
|
|
}
|
|
/* Do we need to flag set_local_var() errors?
|
|
* "assignment to readonly var" and "putenv error"
|
|
*/
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe: return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
/* Expand the rest into (possibly) many strings each */
|
|
argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
|
|
|
|
x = find_builtin(argv_expanded[0]);
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
funcp = NULL;
|
|
if (!x)
|
|
funcp = find_function(argv_expanded[0]);
|
|
#endif
|
|
if (x || funcp) {
|
|
if (!funcp) {
|
|
if (x->function == builtin_exec && argv_expanded[1] == NULL) {
|
|
debug_printf("exec with redirects only\n");
|
|
rcode = setup_redirects(command, NULL);
|
|
goto clean_up_and_ret1;
|
|
}
|
|
}
|
|
/* setup_redirects acts on file descriptors, not FILEs.
|
|
* This is perfect for work that comes after exec().
|
|
* Is it really safe for inline use? Experimentally,
|
|
* things seem to work. */
|
|
rcode = setup_redirects(command, squirrel);
|
|
if (rcode == 0) {
|
|
new_env = expand_assignments(argv, command->assignment_cnt);
|
|
old_vars = set_vars_and_save_old(new_env);
|
|
if (!funcp) {
|
|
debug_printf_exec(": builtin '%s' '%s'...\n",
|
|
x->cmd, argv_expanded[1]);
|
|
rcode = x->function(argv_expanded) & 0xff;
|
|
fflush(NULL);
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else {
|
|
debug_printf_exec(": function '%s' '%s'...\n",
|
|
funcp->name, argv_expanded[1]);
|
|
rcode = run_function(funcp, argv_expanded) & 0xff;
|
|
}
|
|
#endif
|
|
}
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
clean_up_and_ret:
|
|
#endif
|
|
restore_redirects(squirrel);
|
|
unset_vars(new_env);
|
|
add_vars(old_vars);
|
|
clean_up_and_ret1:
|
|
free(argv_expanded);
|
|
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_SH_STANDALONE
|
|
i = find_applet_by_name(argv_expanded[0]);
|
|
if (i >= 0 && APPLET_IS_NOFORK(i)) {
|
|
rcode = setup_redirects(command, squirrel);
|
|
if (rcode == 0) {
|
|
new_env = expand_assignments(argv, command->assignment_cnt);
|
|
old_vars = set_vars_and_save_old(new_env);
|
|
debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
|
|
argv_expanded[0], argv_expanded[1]);
|
|
rcode = run_nofork_applet(i, argv_expanded);
|
|
}
|
|
goto clean_up_and_ret;
|
|
}
|
|
#endif
|
|
/* It is neither builtin nor applet. We must fork. */
|
|
}
|
|
|
|
must_fork:
|
|
/* NB: argv_expanded may already be created, and that
|
|
* might include `cmd` runs! Do not rerun it! We *must*
|
|
* use argv_expanded if it's non-NULL */
|
|
|
|
/* Going to fork a child per each pipe member */
|
|
pi->alive_cmds = 0;
|
|
nextin = 0;
|
|
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
struct fd_pair pipefds;
|
|
#if !BB_MMU
|
|
volatile nommu_save_t nommu_save;
|
|
nommu_save.new_env = NULL;
|
|
nommu_save.old_vars = NULL;
|
|
nommu_save.argv = NULL;
|
|
nommu_save.argv_from_re_execing = NULL;
|
|
#endif
|
|
command = &(pi->cmds[i]);
|
|
if (command->argv) {
|
|
debug_printf_exec(": pipe member '%s' '%s'...\n",
|
|
command->argv[0], command->argv[1]);
|
|
} else {
|
|
debug_printf_exec(": pipe member with no argv\n");
|
|
}
|
|
|
|
/* pipes are inserted between pairs of commands */
|
|
pipefds.rd = 0;
|
|
pipefds.wr = 1;
|
|
if ((i + 1) < pi->num_cmds)
|
|
xpiped_pair(pipefds);
|
|
|
|
command->pid = BB_MMU ? fork() : vfork();
|
|
if (!command->pid) { /* child */
|
|
#if ENABLE_HUSH_JOB
|
|
disable_restore_tty_pgrp_on_exit();
|
|
|
|
/* Every child adds itself to new process group
|
|
* with pgid == pid_of_first_child_in_pipe */
|
|
if (G.run_list_level == 1 && G_interactive_fd) {
|
|
pid_t pgrp;
|
|
pgrp = pi->pgrp;
|
|
if (pgrp < 0) /* true for 1st process only */
|
|
pgrp = getpid();
|
|
if (setpgid(0, pgrp) == 0
|
|
&& pi->followup != PIPE_BG
|
|
&& G_saved_tty_pgrp /* we have ctty */
|
|
) {
|
|
/* We do it in *every* child, not just first,
|
|
* to avoid races */
|
|
tcsetpgrp(G_interactive_fd, pgrp);
|
|
}
|
|
}
|
|
#endif
|
|
if (pi->alive_cmds == 0 && pi->followup == PIPE_BG) {
|
|
/* 1st cmd in backgrounded pipe
|
|
* should have its stdin /dev/null'ed */
|
|
close(0);
|
|
if (open(bb_dev_null, O_RDONLY))
|
|
xopen("/", O_RDONLY);
|
|
} else {
|
|
xmove_fd(nextin, 0);
|
|
}
|
|
xmove_fd(pipefds.wr, 1);
|
|
if (pipefds.rd > 1)
|
|
close(pipefds.rd);
|
|
/* Like bash, explicit redirects override pipes,
|
|
* and the pipe fd is available for dup'ing. */
|
|
if (setup_redirects(command, NULL))
|
|
_exit(1);
|
|
|
|
/* Restore default handlers just prior to exec */
|
|
/*signal(SIGCHLD, SIG_DFL); - so far we don't have any handlers */
|
|
|
|
/* Stores to nommu_save list of env vars putenv'ed
|
|
* (NOMMU, on MMU we don't need that) */
|
|
/* cast away volatility... */
|
|
pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
|
|
/* pseudo_exec() does not return */
|
|
}
|
|
|
|
/* parent or error */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in run_pipe: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
#endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
#if !BB_MMU
|
|
/* Clean up after vforked child */
|
|
free(nommu_save.argv);
|
|
free(nommu_save.argv_from_re_execing);
|
|
unset_vars(nommu_save.new_env);
|
|
add_vars(nommu_save.old_vars);
|
|
#endif
|
|
free(argv_expanded);
|
|
argv_expanded = NULL;
|
|
if (command->pid < 0) { /* [v]fork failed */
|
|
/* Clearly indicate, was it fork or vfork */
|
|
bb_perror_msg(BB_MMU ? "fork" : "vfork");
|
|
} else {
|
|
pi->alive_cmds++;
|
|
#if ENABLE_HUSH_JOB
|
|
/* Second and next children need to know pid of first one */
|
|
if (pi->pgrp < 0)
|
|
pi->pgrp = command->pid;
|
|
#endif
|
|
}
|
|
|
|
if (i)
|
|
close(nextin);
|
|
if ((i + 1) < pi->num_cmds)
|
|
close(pipefds.wr);
|
|
/* Pass read (output) pipe end to next iteration */
|
|
nextin = pipefds.rd;
|
|
}
|
|
|
|
if (!pi->alive_cmds) {
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
|
|
return 1;
|
|
}
|
|
|
|
debug_leave();
|
|
debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
|
|
return -1;
|
|
}
|
|
|
|
#ifndef debug_print_tree
|
|
static void debug_print_tree(struct pipe *pi, int lvl)
|
|
{
|
|
static const char *const PIPE[] = {
|
|
[PIPE_SEQ] = "SEQ",
|
|
[PIPE_AND] = "AND",
|
|
[PIPE_OR ] = "OR" ,
|
|
[PIPE_BG ] = "BG" ,
|
|
};
|
|
static const char *RES[] = {
|
|
[RES_NONE ] = "NONE" ,
|
|
#if ENABLE_HUSH_IF
|
|
[RES_IF ] = "IF" ,
|
|
[RES_THEN ] = "THEN" ,
|
|
[RES_ELIF ] = "ELIF" ,
|
|
[RES_ELSE ] = "ELSE" ,
|
|
[RES_FI ] = "FI" ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
[RES_FOR ] = "FOR" ,
|
|
[RES_WHILE] = "WHILE",
|
|
[RES_UNTIL] = "UNTIL",
|
|
[RES_DO ] = "DO" ,
|
|
[RES_DONE ] = "DONE" ,
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
|
|
[RES_IN ] = "IN" ,
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
[RES_CASE ] = "CASE" ,
|
|
[RES_CASE_IN ] = "CASE_IN" ,
|
|
[RES_MATCH] = "MATCH",
|
|
[RES_CASE_BODY] = "CASE_BODY",
|
|
[RES_ESAC ] = "ESAC" ,
|
|
#endif
|
|
[RES_XXXX ] = "XXXX" ,
|
|
[RES_SNTX ] = "SNTX" ,
|
|
};
|
|
static const char *const GRPTYPE[] = {
|
|
"{}",
|
|
"()",
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
"func()",
|
|
#endif
|
|
};
|
|
|
|
int pin, prn;
|
|
|
|
pin = 0;
|
|
while (pi) {
|
|
fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
|
|
pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
|
|
prn = 0;
|
|
while (prn < pi->num_cmds) {
|
|
struct command *command = &pi->cmds[prn];
|
|
char **argv = command->argv;
|
|
|
|
fprintf(stderr, "%*s cmd %d assignment_cnt:%d",
|
|
lvl*2, "", prn,
|
|
command->assignment_cnt);
|
|
if (command->group) {
|
|
fprintf(stderr, " group %s: (argv=%p)\n",
|
|
GRPTYPE[command->grp_type],
|
|
argv);
|
|
debug_print_tree(command->group, lvl+1);
|
|
prn++;
|
|
continue;
|
|
}
|
|
if (argv) while (*argv) {
|
|
fprintf(stderr, " '%s'", *argv);
|
|
argv++;
|
|
}
|
|
fprintf(stderr, "\n");
|
|
prn++;
|
|
}
|
|
pi = pi->next;
|
|
pin++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* NB: called by pseudo_exec, and therefore must not modify any
|
|
* global data until exec/_exit (we can be a child after vfork!) */
|
|
static int run_list(struct pipe *pi)
|
|
{
|
|
#if ENABLE_HUSH_CASE
|
|
char *case_word = NULL;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
struct pipe *loop_top = NULL;
|
|
char **for_lcur = NULL;
|
|
char **for_list = NULL;
|
|
#endif
|
|
smallint last_followup;
|
|
smalluint rcode;
|
|
#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
|
|
smalluint cond_code = 0;
|
|
#else
|
|
enum { cond_code = 0 };
|
|
#endif
|
|
#if HAS_KEYWORDS
|
|
smallint rword; /* enum reserved_style */
|
|
smallint last_rword; /* ditto */
|
|
#endif
|
|
|
|
debug_printf_exec("run_list start lvl %d\n", G.run_list_level);
|
|
debug_enter();
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Check syntax for "for" */
|
|
for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) {
|
|
if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
|
|
continue;
|
|
/* current word is FOR or IN (BOLD in comments below) */
|
|
if (cpipe->next == NULL) {
|
|
syntax_error("malformed for");
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
|
return 1;
|
|
}
|
|
/* "FOR v; do ..." and "for v IN a b; do..." are ok */
|
|
if (cpipe->next->res_word == RES_DO)
|
|
continue;
|
|
/* next word is not "do". It must be "in" then ("FOR v in ...") */
|
|
if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
|
|
|| cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
|
|
) {
|
|
syntax_error("malformed for");
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
|
|
return 1;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Past this point, all code paths should jump to ret: label
|
|
* in order to return, no direct "return" statements please.
|
|
* This helps to ensure that no memory is leaked. */
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
G.run_list_level++;
|
|
#endif
|
|
|
|
#if HAS_KEYWORDS
|
|
rword = RES_NONE;
|
|
last_rword = RES_XXXX;
|
|
#endif
|
|
last_followup = PIPE_SEQ;
|
|
rcode = G.last_exitcode;
|
|
|
|
/* Go through list of pipes, (maybe) executing them. */
|
|
for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
|
|
if (G.flag_SIGINT)
|
|
break;
|
|
|
|
IF_HAS_KEYWORDS(rword = pi->res_word;)
|
|
debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
|
|
rword, cond_code, last_rword);
|
|
#if ENABLE_HUSH_LOOPS
|
|
if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
|
|
&& loop_top == NULL /* avoid bumping G.depth_of_loop twice */
|
|
) {
|
|
/* start of a loop: remember where loop starts */
|
|
loop_top = pi;
|
|
G.depth_of_loop++;
|
|
}
|
|
#endif
|
|
/* Still in the same "if...", "then..." or "do..." branch? */
|
|
if (IF_HAS_KEYWORDS(rword == last_rword &&) 1) {
|
|
if ((rcode == 0 && last_followup == PIPE_OR)
|
|
|| (rcode != 0 && last_followup == PIPE_AND)
|
|
) {
|
|
/* It is "<true> || CMD" or "<false> && CMD"
|
|
* and we should not execute CMD */
|
|
debug_printf_exec("skipped cmd because of || or &&\n");
|
|
last_followup = pi->followup;
|
|
continue;
|
|
}
|
|
}
|
|
last_followup = pi->followup;
|
|
IF_HAS_KEYWORDS(last_rword = rword;)
|
|
#if ENABLE_HUSH_IF
|
|
if (cond_code) {
|
|
if (rword == RES_THEN) {
|
|
/* if false; then ... fi has exitcode 0! */
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
/* "if <false> THEN cmd": skip cmd */
|
|
continue;
|
|
}
|
|
} else {
|
|
if (rword == RES_ELSE || rword == RES_ELIF) {
|
|
/* "if <true> then ... ELSE/ELIF cmd":
|
|
* skip cmd and all following ones */
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
|
|
if (!for_lcur) {
|
|
/* first loop through for */
|
|
|
|
static const char encoded_dollar_at[] ALIGN1 = {
|
|
SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
|
|
}; /* encoded representation of "$@" */
|
|
static const char *const encoded_dollar_at_argv[] = {
|
|
encoded_dollar_at, NULL
|
|
}; /* argv list with one element: "$@" */
|
|
char **vals;
|
|
|
|
vals = (char**)encoded_dollar_at_argv;
|
|
if (pi->next->res_word == RES_IN) {
|
|
/* if no variable values after "in" we skip "for" */
|
|
if (!pi->next->cmds[0].argv) {
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
|
|
break;
|
|
}
|
|
vals = pi->next->cmds[0].argv;
|
|
} /* else: "for var; do..." -> assume "$@" list */
|
|
/* create list of variable values */
|
|
debug_print_strings("for_list made from", vals);
|
|
for_list = expand_strvec_to_strvec(vals);
|
|
for_lcur = for_list;
|
|
debug_print_strings("for_list", for_list);
|
|
}
|
|
if (!*for_lcur) {
|
|
/* "for" loop is over, clean up */
|
|
free(for_list);
|
|
for_list = NULL;
|
|
for_lcur = NULL;
|
|
break;
|
|
}
|
|
/* Insert next value from for_lcur */
|
|
/* note: *for_lcur already has quotes removed, $var expanded, etc */
|
|
set_local_var(xasprintf("%s=%s", pi->cmds[0].argv[0], *for_lcur++), 0, 0);
|
|
continue;
|
|
}
|
|
if (rword == RES_IN) {
|
|
continue; /* "for v IN list;..." - "in" has no cmds anyway */
|
|
}
|
|
if (rword == RES_DONE) {
|
|
continue; /* "done" has no cmds too */
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
if (rword == RES_CASE) {
|
|
case_word = expand_strvec_to_string(pi->cmds->argv);
|
|
continue;
|
|
}
|
|
if (rword == RES_MATCH) {
|
|
char **argv;
|
|
|
|
if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
|
|
break;
|
|
/* all prev words didn't match, does this one match? */
|
|
argv = pi->cmds->argv;
|
|
while (*argv) {
|
|
char *pattern = expand_string_to_string(*argv);
|
|
/* TODO: which FNM_xxx flags to use? */
|
|
cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
|
|
free(pattern);
|
|
if (cond_code == 0) { /* match! we will execute this branch */
|
|
free(case_word); /* make future "word)" stop */
|
|
case_word = NULL;
|
|
break;
|
|
}
|
|
argv++;
|
|
}
|
|
continue;
|
|
}
|
|
if (rword == RES_CASE_BODY) { /* inside of a case branch */
|
|
if (cond_code != 0)
|
|
continue; /* not matched yet, skip this pipe */
|
|
}
|
|
#endif
|
|
/* Just pressing <enter> in shell should check for jobs.
|
|
* OTOH, in non-interactive shell this is useless
|
|
* and only leads to extra job checks */
|
|
if (pi->num_cmds == 0) {
|
|
if (G_interactive_fd)
|
|
goto check_jobs_and_continue;
|
|
continue;
|
|
}
|
|
|
|
/* After analyzing all keywords and conditions, we decided
|
|
* to execute this pipe. NB: have to do checkjobs(NULL)
|
|
* after run_pipe to collect any background children,
|
|
* even if list execution is to be stopped. */
|
|
debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
|
|
{
|
|
int r;
|
|
#if ENABLE_HUSH_LOOPS
|
|
G.flag_break_continue = 0;
|
|
#endif
|
|
rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
|
|
if (r != -1) {
|
|
/* We ran a builtin, function, or group.
|
|
* rcode is already known
|
|
* and we don't need to wait for anything. */
|
|
G.last_exitcode = rcode;
|
|
debug_printf_exec(": builtin/func exitcode %d\n", rcode);
|
|
check_and_run_traps(0);
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Was it "break" or "continue"? */
|
|
if (G.flag_break_continue) {
|
|
smallint fbc = G.flag_break_continue;
|
|
/* We might fall into outer *loop*,
|
|
* don't want to break it too */
|
|
if (loop_top) {
|
|
G.depth_break_continue--;
|
|
if (G.depth_break_continue == 0)
|
|
G.flag_break_continue = 0;
|
|
/* else: e.g. "continue 2" should *break* once, *then* continue */
|
|
} /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
|
|
if (G.depth_break_continue != 0 || fbc == BC_BREAK)
|
|
goto check_jobs_and_break;
|
|
/* "continue": simulate end of loop */
|
|
rword = RES_DONE;
|
|
continue;
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (G.flag_return_in_progress == 1) {
|
|
/* same as "goto check_jobs_and_break" */
|
|
checkjobs(NULL);
|
|
break;
|
|
}
|
|
#endif
|
|
} else if (pi->followup == PIPE_BG) {
|
|
/* What does bash do with attempts to background builtins? */
|
|
/* even bash 3.2 doesn't do that well with nested bg:
|
|
* try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
|
|
* I'm NOT treating inner &'s as jobs */
|
|
check_and_run_traps(0);
|
|
#if ENABLE_HUSH_JOB
|
|
if (G.run_list_level == 1)
|
|
insert_bg_job(pi);
|
|
#endif
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
|
|
} else {
|
|
#if ENABLE_HUSH_JOB
|
|
if (G.run_list_level == 1 && G_interactive_fd) {
|
|
/* Waits for completion, then fg's main shell */
|
|
rcode = checkjobs_and_fg_shell(pi);
|
|
debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
|
|
check_and_run_traps(0);
|
|
} else
|
|
#endif
|
|
{ /* This one just waits for completion */
|
|
rcode = checkjobs(pi);
|
|
debug_printf_exec(": checkjobs exitcode %d\n", rcode);
|
|
check_and_run_traps(0);
|
|
}
|
|
G.last_exitcode = rcode;
|
|
}
|
|
}
|
|
|
|
/* Analyze how result affects subsequent commands */
|
|
#if ENABLE_HUSH_IF
|
|
if (rword == RES_IF || rword == RES_ELIF)
|
|
cond_code = rcode;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
/* Beware of "while false; true; do ..."! */
|
|
if (pi->next && pi->next->res_word == RES_DO) {
|
|
if (rword == RES_WHILE) {
|
|
if (rcode) {
|
|
/* "while false; do...done" - exitcode 0 */
|
|
G.last_exitcode = rcode = EXIT_SUCCESS;
|
|
debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
|
|
goto check_jobs_and_break;
|
|
}
|
|
}
|
|
if (rword == RES_UNTIL) {
|
|
if (!rcode) {
|
|
debug_printf_exec(": until expr is true: breaking\n");
|
|
check_jobs_and_break:
|
|
checkjobs(NULL);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
check_jobs_and_continue:
|
|
checkjobs(NULL);
|
|
} /* for (pi) */
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
G.run_list_level--;
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (loop_top)
|
|
G.depth_of_loop--;
|
|
free(for_list);
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
free(case_word);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
|
|
return rcode;
|
|
}
|
|
|
|
/* Select which version we will use */
|
|
static int run_and_free_list(struct pipe *pi)
|
|
{
|
|
int rcode = 0;
|
|
debug_printf_exec("run_and_free_list entered\n");
|
|
if (!G.fake_mode) {
|
|
debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
|
|
rcode = run_list(pi);
|
|
}
|
|
/* free_pipe_list has the side effect of clearing memory.
|
|
* In the long run that function can be merged with run_list,
|
|
* but doing that now would hobble the debugging effort. */
|
|
free_pipe_list(pi);
|
|
debug_printf_exec("run_and_free_list return %d\n", rcode);
|
|
return rcode;
|
|
}
|
|
|
|
|
|
static struct pipe *new_pipe(void)
|
|
{
|
|
struct pipe *pi;
|
|
pi = xzalloc(sizeof(struct pipe));
|
|
/*pi->followup = 0; - deliberately invalid value */
|
|
/*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
|
|
return pi;
|
|
}
|
|
|
|
/* Command (member of a pipe) is complete, or we start a new pipe
|
|
* if ctx->command is NULL.
|
|
* No errors possible here.
|
|
*/
|
|
static int done_command(struct parse_context *ctx)
|
|
{
|
|
/* The command is really already in the pipe structure, so
|
|
* advance the pipe counter and make a new, null command. */
|
|
struct pipe *pi = ctx->pipe;
|
|
struct command *command = ctx->command;
|
|
|
|
if (command) {
|
|
if (IS_NULL_CMD(command)) {
|
|
debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
|
|
goto clear_and_ret;
|
|
}
|
|
pi->num_cmds++;
|
|
debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
|
|
//debug_print_tree(ctx->list_head, 20);
|
|
} else {
|
|
debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
|
|
}
|
|
|
|
/* Only real trickiness here is that the uncommitted
|
|
* command structure is not counted in pi->num_cmds. */
|
|
pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
|
|
ctx->command = command = &pi->cmds[pi->num_cmds];
|
|
clear_and_ret:
|
|
memset(command, 0, sizeof(*command));
|
|
return pi->num_cmds; /* used only for 0/nonzero check */
|
|
}
|
|
|
|
static void done_pipe(struct parse_context *ctx, pipe_style type)
|
|
{
|
|
int not_null;
|
|
|
|
debug_printf_parse("done_pipe entered, followup %d\n", type);
|
|
/* Close previous command */
|
|
not_null = done_command(ctx);
|
|
ctx->pipe->followup = type;
|
|
#if HAS_KEYWORDS
|
|
ctx->pipe->pi_inverted = ctx->ctx_inverted;
|
|
ctx->ctx_inverted = 0;
|
|
ctx->pipe->res_word = ctx->ctx_res_w;
|
|
#endif
|
|
|
|
/* Without this check, even just <enter> on command line generates
|
|
* tree of three NOPs (!). Which is harmless but annoying.
|
|
* IOW: it is safe to do it unconditionally. */
|
|
if (not_null
|
|
#if ENABLE_HUSH_IF
|
|
|| ctx->ctx_res_w == RES_FI
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
|| ctx->ctx_res_w == RES_DONE
|
|
|| ctx->ctx_res_w == RES_FOR
|
|
|| ctx->ctx_res_w == RES_IN
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
|| ctx->ctx_res_w == RES_ESAC
|
|
#endif
|
|
) {
|
|
struct pipe *new_p;
|
|
debug_printf_parse("done_pipe: adding new pipe: "
|
|
"not_null:%d ctx->ctx_res_w:%d\n",
|
|
not_null, ctx->ctx_res_w);
|
|
new_p = new_pipe();
|
|
ctx->pipe->next = new_p;
|
|
ctx->pipe = new_p;
|
|
/* RES_THEN, RES_DO etc are "sticky" -
|
|
* they remain set for pipes inside if/while.
|
|
* This is used to control execution.
|
|
* RES_FOR and RES_IN are NOT sticky (needed to support
|
|
* cases where variable or value happens to match a keyword):
|
|
*/
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (ctx->ctx_res_w == RES_FOR
|
|
|| ctx->ctx_res_w == RES_IN)
|
|
ctx->ctx_res_w = RES_NONE;
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx->ctx_res_w == RES_MATCH)
|
|
ctx->ctx_res_w = RES_CASE_BODY;
|
|
if (ctx->ctx_res_w == RES_CASE)
|
|
ctx->ctx_res_w = RES_CASE_IN;
|
|
#endif
|
|
ctx->command = NULL; /* trick done_command below */
|
|
/* Create the memory for command, roughly:
|
|
* ctx->pipe->cmds = new struct command;
|
|
* ctx->command = &ctx->pipe->cmds[0];
|
|
*/
|
|
done_command(ctx);
|
|
//debug_print_tree(ctx->list_head, 10);
|
|
}
|
|
debug_printf_parse("done_pipe return\n");
|
|
}
|
|
|
|
static void initialize_context(struct parse_context *ctx)
|
|
{
|
|
memset(ctx, 0, sizeof(*ctx));
|
|
ctx->pipe = ctx->list_head = new_pipe();
|
|
/* Create the memory for command, roughly:
|
|
* ctx->pipe->cmds = new struct command;
|
|
* ctx->command = &ctx->pipe->cmds[0];
|
|
*/
|
|
done_command(ctx);
|
|
}
|
|
|
|
/* If a reserved word is found and processed, parse context is modified
|
|
* and 1 is returned.
|
|
*/
|
|
#if HAS_KEYWORDS
|
|
struct reserved_combo {
|
|
char literal[6];
|
|
unsigned char res;
|
|
unsigned char assignment_flag;
|
|
int flag;
|
|
};
|
|
enum {
|
|
FLAG_END = (1 << RES_NONE ),
|
|
#if ENABLE_HUSH_IF
|
|
FLAG_IF = (1 << RES_IF ),
|
|
FLAG_THEN = (1 << RES_THEN ),
|
|
FLAG_ELIF = (1 << RES_ELIF ),
|
|
FLAG_ELSE = (1 << RES_ELSE ),
|
|
FLAG_FI = (1 << RES_FI ),
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
FLAG_FOR = (1 << RES_FOR ),
|
|
FLAG_WHILE = (1 << RES_WHILE),
|
|
FLAG_UNTIL = (1 << RES_UNTIL),
|
|
FLAG_DO = (1 << RES_DO ),
|
|
FLAG_DONE = (1 << RES_DONE ),
|
|
FLAG_IN = (1 << RES_IN ),
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
FLAG_MATCH = (1 << RES_MATCH),
|
|
FLAG_ESAC = (1 << RES_ESAC ),
|
|
#endif
|
|
FLAG_START = (1 << RES_XXXX ),
|
|
};
|
|
|
|
static const struct reserved_combo* match_reserved_word(o_string *word)
|
|
{
|
|
/* Mostly a list of accepted follow-up reserved words.
|
|
* FLAG_END means we are done with the sequence, and are ready
|
|
* to turn the compound list into a command.
|
|
* FLAG_START means the word must start a new compound list.
|
|
*/
|
|
static const struct reserved_combo reserved_list[] = {
|
|
#if ENABLE_HUSH_IF
|
|
{ "!", RES_NONE, NOT_ASSIGNMENT , 0 },
|
|
{ "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START },
|
|
{ "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
|
|
{ "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN },
|
|
{ "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI },
|
|
{ "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
|
|
#endif
|
|
#if ENABLE_HUSH_LOOPS
|
|
{ "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
|
|
{ "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
|
|
{ "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
|
|
{ "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
|
|
{ "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE },
|
|
{ "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
{ "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
|
|
{ "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
|
|
#endif
|
|
};
|
|
const struct reserved_combo *r;
|
|
|
|
for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
|
|
if (strcmp(word->data, r->literal) == 0)
|
|
return r;
|
|
}
|
|
return NULL;
|
|
}
|
|
/* Return 0: not a keyword, 1: keyword
|
|
*/
|
|
static int reserved_word(o_string *word, struct parse_context *ctx)
|
|
{
|
|
#if ENABLE_HUSH_CASE
|
|
static const struct reserved_combo reserved_match = {
|
|
"", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
|
|
};
|
|
#endif
|
|
const struct reserved_combo *r;
|
|
|
|
if (word->o_quoted)
|
|
return 0;
|
|
r = match_reserved_word(word);
|
|
if (!r)
|
|
return 0;
|
|
|
|
debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
|
|
#if ENABLE_HUSH_CASE
|
|
if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE_IN) {
|
|
/* "case word IN ..." - IN part starts first MATCH part */
|
|
r = &reserved_match;
|
|
} else
|
|
#endif
|
|
if (r->flag == 0) { /* '!' */
|
|
if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
|
|
syntax_error("! ! command");
|
|
ctx->ctx_res_w = RES_SNTX;
|
|
}
|
|
ctx->ctx_inverted = 1;
|
|
return 1;
|
|
}
|
|
if (r->flag & FLAG_START) {
|
|
struct parse_context *old;
|
|
|
|
old = xmalloc(sizeof(*old));
|
|
debug_printf_parse("push stack %p\n", old);
|
|
*old = *ctx; /* physical copy */
|
|
initialize_context(ctx);
|
|
ctx->stack = old;
|
|
} else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
|
|
syntax_error_at(word->data);
|
|
ctx->ctx_res_w = RES_SNTX;
|
|
return 1;
|
|
} else {
|
|
/* "{...} fi" is ok. "{...} if" is not
|
|
* Example:
|
|
* if { echo foo; } then { echo bar; } fi */
|
|
if (ctx->command->group)
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
|
|
ctx->ctx_res_w = r->res;
|
|
ctx->old_flag = r->flag;
|
|
word->o_assignment = r->assignment_flag;
|
|
|
|
if (ctx->old_flag & FLAG_END) {
|
|
struct parse_context *old;
|
|
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
debug_printf_parse("pop stack %p\n", ctx->stack);
|
|
old = ctx->stack;
|
|
old->command->group = ctx->list_head;
|
|
old->command->grp_type = GRP_NORMAL;
|
|
#if !BB_MMU
|
|
o_addstr(&old->as_string, ctx->as_string.data);
|
|
o_free_unsafe(&ctx->as_string);
|
|
old->command->group_as_string = xstrdup(old->as_string.data);
|
|
debug_printf_parse("pop, remembering as:'%s'\n",
|
|
old->command->group_as_string);
|
|
#endif
|
|
*ctx = *old; /* physical copy */
|
|
free(old);
|
|
}
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
/* Word is complete, look at it and update parsing context.
|
|
* Normal return is 0. Syntax errors return 1.
|
|
* Note: on return, word is reset, but not o_free'd!
|
|
*/
|
|
static int done_word(o_string *word, struct parse_context *ctx)
|
|
{
|
|
struct command *command = ctx->command;
|
|
|
|
debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
|
|
if (word->length == 0 && word->o_quoted == 0) {
|
|
debug_printf_parse("done_word return 0: true null, ignored\n");
|
|
return 0;
|
|
}
|
|
|
|
if (ctx->pending_redirect) {
|
|
/* We do not glob in e.g. >*.tmp case. bash seems to glob here
|
|
* only if run as "bash", not "sh" */
|
|
/* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
|
* "2.7 Redirection
|
|
* ...the word that follows the redirection operator
|
|
* shall be subjected to tilde expansion, parameter expansion,
|
|
* command substitution, arithmetic expansion, and quote
|
|
* removal. Pathname expansion shall not be performed
|
|
* on the word by a non-interactive shell; an interactive
|
|
* shell may perform it, but shall do so only when
|
|
* the expansion would result in one word."
|
|
*/
|
|
ctx->pending_redirect->rd_filename = xstrdup(word->data);
|
|
/* Cater for >\file case:
|
|
* >\a creates file a; >\\a, >"\a", >"\\a" create file \a
|
|
* Same with heredocs:
|
|
* for <<\H delim is H; <<\\H, <<"\H", <<"\\H" - \H
|
|
*/
|
|
if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC) {
|
|
unbackslash(ctx->pending_redirect->rd_filename);
|
|
/* Is it <<"HEREDOC"? */
|
|
if (word->o_quoted) {
|
|
ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
|
|
}
|
|
}
|
|
debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
|
|
ctx->pending_redirect = NULL;
|
|
} else {
|
|
/* If this word wasn't an assignment, next ones definitely
|
|
* can't be assignments. Even if they look like ones. */
|
|
if (word->o_assignment != DEFINITELY_ASSIGNMENT
|
|
&& word->o_assignment != WORD_IS_KEYWORD
|
|
) {
|
|
word->o_assignment = NOT_ASSIGNMENT;
|
|
} else {
|
|
if (word->o_assignment == DEFINITELY_ASSIGNMENT)
|
|
command->assignment_cnt++;
|
|
word->o_assignment = MAYBE_ASSIGNMENT;
|
|
}
|
|
|
|
#if HAS_KEYWORDS
|
|
# if ENABLE_HUSH_CASE
|
|
if (ctx->ctx_dsemicolon
|
|
&& strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
|
|
) {
|
|
/* already done when ctx_dsemicolon was set to 1: */
|
|
/* ctx->ctx_res_w = RES_MATCH; */
|
|
ctx->ctx_dsemicolon = 0;
|
|
} else
|
|
# endif
|
|
if (!command->argv /* if it's the first word... */
|
|
# if ENABLE_HUSH_LOOPS
|
|
&& ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
|
|
&& ctx->ctx_res_w != RES_IN
|
|
# endif
|
|
# if ENABLE_HUSH_CASE
|
|
&& ctx->ctx_res_w != RES_CASE
|
|
# endif
|
|
) {
|
|
debug_printf_parse("checking '%s' for reserved-ness\n", word->data);
|
|
if (reserved_word(word, ctx)) {
|
|
o_reset_to_empty_unquoted(word);
|
|
debug_printf_parse("done_word return %d\n",
|
|
(ctx->ctx_res_w == RES_SNTX));
|
|
return (ctx->ctx_res_w == RES_SNTX);
|
|
}
|
|
}
|
|
#endif
|
|
if (command->group) {
|
|
/* "{ echo foo; } echo bar" - bad */
|
|
syntax_error_at(word->data);
|
|
debug_printf_parse("done_word return 1: syntax error, "
|
|
"groups and arglists don't mix\n");
|
|
return 1;
|
|
}
|
|
if (word->o_quoted /* word had "xx" or 'xx' at least as part of it. */
|
|
/* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
|
|
&& (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
|
|
/* (otherwise it's known to be not empty and is already safe) */
|
|
) {
|
|
/* exclude "$@" - it can expand to no word despite "" */
|
|
char *p = word->data;
|
|
while (p[0] == SPECIAL_VAR_SYMBOL
|
|
&& (p[1] & 0x7f) == '@'
|
|
&& p[2] == SPECIAL_VAR_SYMBOL
|
|
) {
|
|
p += 3;
|
|
}
|
|
if (p == word->data || p[0] != '\0') {
|
|
/* saw no "$@", or not only "$@" but some
|
|
* real text is there too */
|
|
/* insert "empty variable" reference, this makes
|
|
* e.g. "", $empty"" etc to not disappear */
|
|
o_addchr(word, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(word, SPECIAL_VAR_SYMBOL);
|
|
}
|
|
}
|
|
command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
|
|
debug_print_strings("word appended to argv", command->argv);
|
|
}
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
if (ctx->ctx_res_w == RES_FOR) {
|
|
if (word->o_quoted
|
|
|| !is_well_formed_var_name(command->argv[0], '\0')
|
|
) {
|
|
/* bash says just "not a valid identifier" */
|
|
syntax_error("not a valid identifier in for");
|
|
return 1;
|
|
}
|
|
/* Force FOR to have just one word (variable name) */
|
|
/* NB: basically, this makes hush see "for v in ..."
|
|
* syntax as if it is "for v; in ...". FOR and IN become
|
|
* two pipe structs in parse tree. */
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
#endif
|
|
#if ENABLE_HUSH_CASE
|
|
/* Force CASE to have just one word */
|
|
if (ctx->ctx_res_w == RES_CASE) {
|
|
done_pipe(ctx, PIPE_SEQ);
|
|
}
|
|
#endif
|
|
|
|
o_reset_to_empty_unquoted(word);
|
|
|
|
debug_printf_parse("done_word return 0\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Peek ahead in the input to find out if we have a "&n" construct,
|
|
* as in "2>&1", that represents duplicating a file descriptor.
|
|
* Return:
|
|
* REDIRFD_CLOSE if >&- "close fd" construct is seen,
|
|
* REDIRFD_SYNTAX_ERR if syntax error,
|
|
* REDIRFD_TO_FILE if no & was seen,
|
|
* or the number found.
|
|
*/
|
|
#if BB_MMU
|
|
#define parse_redir_right_fd(as_string, input) \
|
|
parse_redir_right_fd(input)
|
|
#endif
|
|
static int parse_redir_right_fd(o_string *as_string, struct in_str *input)
|
|
{
|
|
int ch, d, ok;
|
|
|
|
ch = i_peek(input);
|
|
if (ch != '&')
|
|
return REDIRFD_TO_FILE;
|
|
|
|
ch = i_getch(input); /* get the & */
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
if (ch == '-') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
return REDIRFD_CLOSE;
|
|
}
|
|
d = 0;
|
|
ok = 0;
|
|
while (ch != EOF && isdigit(ch)) {
|
|
d = d*10 + (ch-'0');
|
|
ok = 1;
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
}
|
|
if (ok) return d;
|
|
|
|
//TODO: this is the place to catch ">&file" bashism (redirect both fd 1 and 2)
|
|
|
|
bb_error_msg("ambiguous redirect");
|
|
return REDIRFD_SYNTAX_ERR;
|
|
}
|
|
|
|
/* Return code is 0 normal, 1 if a syntax error is detected
|
|
*/
|
|
static int parse_redirect(struct parse_context *ctx,
|
|
int fd,
|
|
redir_type style,
|
|
struct in_str *input)
|
|
{
|
|
struct command *command = ctx->command;
|
|
struct redir_struct *redir;
|
|
struct redir_struct **redirp;
|
|
int dup_num;
|
|
|
|
dup_num = REDIRFD_TO_FILE;
|
|
if (style != REDIRECT_HEREDOC) {
|
|
/* Check for a '>&1' type redirect */
|
|
dup_num = parse_redir_right_fd(&ctx->as_string, input);
|
|
if (dup_num == REDIRFD_SYNTAX_ERR)
|
|
return 1;
|
|
} else {
|
|
int ch = i_peek(input);
|
|
dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
|
|
if (dup_num) { /* <<-... */
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
ch = i_peek(input);
|
|
}
|
|
}
|
|
|
|
if (style == REDIRECT_OVERWRITE && dup_num == REDIRFD_TO_FILE) {
|
|
int ch = i_peek(input);
|
|
if (ch == '|') {
|
|
/* >|FILE redirect ("clobbering" >).
|
|
* Since we do not support "set -o noclobber" yet,
|
|
* >| and > are the same for now. Just eat |.
|
|
*/
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
}
|
|
}
|
|
|
|
/* Create a new redir_struct and append it to the linked list */
|
|
redirp = &command->redirects;
|
|
while ((redir = *redirp) != NULL) {
|
|
redirp = &(redir->next);
|
|
}
|
|
*redirp = redir = xzalloc(sizeof(*redir));
|
|
/* redir->next = NULL; */
|
|
/* redir->rd_filename = NULL; */
|
|
redir->rd_type = style;
|
|
redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
|
|
|
|
debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
|
|
redir_table[style].descrip);
|
|
|
|
redir->rd_dup = dup_num;
|
|
if (style != REDIRECT_HEREDOC && dup_num != REDIRFD_TO_FILE) {
|
|
/* Erik had a check here that the file descriptor in question
|
|
* is legit; I postpone that to "run time"
|
|
* A "-" representation of "close me" shows up as a -3 here */
|
|
debug_printf_parse("duplicating redirect '%d>&%d'\n",
|
|
redir->rd_fd, redir->rd_dup);
|
|
} else {
|
|
/* Set ctx->pending_redirect, so we know what to do at the
|
|
* end of the next parsed word. */
|
|
ctx->pending_redirect = redir;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* If a redirect is immediately preceded by a number, that number is
|
|
* supposed to tell which file descriptor to redirect. This routine
|
|
* looks for such preceding numbers. In an ideal world this routine
|
|
* needs to handle all the following classes of redirects...
|
|
* echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
|
|
* echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
|
|
* echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
|
|
* echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
|
|
*
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html
|
|
* "2.7 Redirection
|
|
* ... If n is quoted, the number shall not be recognized as part of
|
|
* the redirection expression. For example:
|
|
* echo \2>a
|
|
* writes the character 2 into file a"
|
|
* We are getting it right by setting ->o_quoted on any \<char>
|
|
*
|
|
* A -1 return means no valid number was found,
|
|
* the caller should use the appropriate default for this redirection.
|
|
*/
|
|
static int redirect_opt_num(o_string *o)
|
|
{
|
|
int num;
|
|
|
|
if (o->data == NULL)
|
|
return -1;
|
|
num = bb_strtou(o->data, NULL, 10);
|
|
if (errno || num < 0)
|
|
return -1;
|
|
o_reset_to_empty_unquoted(o);
|
|
return num;
|
|
}
|
|
|
|
#if BB_MMU
|
|
#define fetch_till_str(as_string, input, word, skip_tabs) \
|
|
fetch_till_str(input, word, skip_tabs)
|
|
#endif
|
|
static char *fetch_till_str(o_string *as_string,
|
|
struct in_str *input,
|
|
const char *word,
|
|
int skip_tabs)
|
|
{
|
|
o_string heredoc = NULL_O_STRING;
|
|
int past_EOL = 0;
|
|
int ch;
|
|
|
|
goto jump_in;
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
if (ch == '\n') {
|
|
if (strcmp(heredoc.data + past_EOL, word) == 0) {
|
|
heredoc.data[past_EOL] = '\0';
|
|
debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
|
|
return heredoc.data;
|
|
}
|
|
do {
|
|
o_addchr(&heredoc, ch);
|
|
past_EOL = heredoc.length;
|
|
jump_in:
|
|
do {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
} while (skip_tabs && ch == '\t');
|
|
} while (ch == '\n');
|
|
}
|
|
if (ch == EOF) {
|
|
o_free_unsafe(&heredoc);
|
|
return NULL;
|
|
}
|
|
o_addchr(&heredoc, ch);
|
|
nommu_addchr(as_string, ch);
|
|
}
|
|
}
|
|
|
|
/* Look at entire parse tree for not-yet-loaded REDIRECT_HEREDOCs
|
|
* and load them all. There should be exactly heredoc_cnt of them.
|
|
*/
|
|
static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_str *input)
|
|
{
|
|
struct pipe *pi = ctx->list_head;
|
|
|
|
while (pi && heredoc_cnt) {
|
|
int i;
|
|
struct command *cmd = pi->cmds;
|
|
|
|
debug_printf_parse("fetch_heredocs: num_cmds:%d cmd argv0:'%s'\n",
|
|
pi->num_cmds,
|
|
cmd->argv ? cmd->argv[0] : "NONE");
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
struct redir_struct *redir = cmd->redirects;
|
|
|
|
debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
|
|
i, cmd->argv ? cmd->argv[0] : "NONE");
|
|
while (redir) {
|
|
if (redir->rd_type == REDIRECT_HEREDOC) {
|
|
char *p;
|
|
|
|
redir->rd_type = REDIRECT_HEREDOC2;
|
|
/* redir->dup is (ab)used to indicate <<- */
|
|
p = fetch_till_str(&ctx->as_string, input,
|
|
redir->rd_filename, redir->rd_dup & HEREDOC_SKIPTABS);
|
|
if (!p) {
|
|
syntax_error("unexpected EOF in here document");
|
|
return 1;
|
|
}
|
|
free(redir->rd_filename);
|
|
redir->rd_filename = p;
|
|
heredoc_cnt--;
|
|
}
|
|
redir = redir->next;
|
|
}
|
|
cmd++;
|
|
}
|
|
pi = pi->next;
|
|
}
|
|
#if 0
|
|
/* Should be 0. If it isn't, it's a parse error */
|
|
if (heredoc_cnt)
|
|
bb_error_msg_and_die("heredoc BUG 2");
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
#if ENABLE_HUSH_TICK
|
|
static FILE *generate_stream_from_string(const char *s)
|
|
{
|
|
FILE *pf;
|
|
int pid, channel[2];
|
|
#if !BB_MMU
|
|
char **to_free;
|
|
#endif
|
|
|
|
xpipe(channel);
|
|
pid = BB_MMU ? fork() : vfork();
|
|
if (pid < 0)
|
|
bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
|
|
|
|
if (pid == 0) { /* child */
|
|
disable_restore_tty_pgrp_on_exit();
|
|
/* Process substitution is not considered to be usual
|
|
* 'command execution'.
|
|
* SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
|
|
*/
|
|
bb_signals(0
|
|
+ (1 << SIGTSTP)
|
|
+ (1 << SIGTTIN)
|
|
+ (1 << SIGTTOU)
|
|
, SIG_IGN);
|
|
close(channel[0]); /* NB: close _first_, then move fd! */
|
|
xmove_fd(channel[1], 1);
|
|
/* Prevent it from trying to handle ctrl-z etc */
|
|
IF_HUSH_JOB(G.run_list_level = 1;)
|
|
#if BB_MMU
|
|
reset_traps_to_defaults();
|
|
parse_and_run_string(s);
|
|
_exit(G.last_exitcode);
|
|
#else
|
|
/* We re-execute after vfork on NOMMU. This makes this script safe:
|
|
* yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
|
|
* huge=`cat BIG` # was blocking here forever
|
|
* echo OK
|
|
*/
|
|
re_execute_shell(&to_free,
|
|
s,
|
|
G.global_argv[0],
|
|
G.global_argv + 1);
|
|
#endif
|
|
}
|
|
|
|
/* parent */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++;
|
|
//bb_error_msg("[%d] fork in generate_stream_from_string: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
|
|
#endif
|
|
enable_restore_tty_pgrp_on_exit();
|
|
#if !BB_MMU
|
|
free(to_free);
|
|
#endif
|
|
close(channel[1]);
|
|
pf = fdopen(channel[0], "r");
|
|
return pf;
|
|
}
|
|
|
|
/* Return code is exit status of the process that is run. */
|
|
static int process_command_subs(o_string *dest, const char *s)
|
|
{
|
|
FILE *pf;
|
|
struct in_str pipe_str;
|
|
int ch, eol_cnt;
|
|
|
|
pf = generate_stream_from_string(s);
|
|
if (pf == NULL)
|
|
return 1;
|
|
close_on_exec_on(fileno(pf));
|
|
|
|
/* Now send results of command back into original context */
|
|
setup_file_in_str(&pipe_str, pf);
|
|
eol_cnt = 0;
|
|
while ((ch = i_getch(&pipe_str)) != EOF) {
|
|
if (ch == '\n') {
|
|
eol_cnt++;
|
|
continue;
|
|
}
|
|
while (eol_cnt) {
|
|
o_addchr(dest, '\n');
|
|
eol_cnt--;
|
|
}
|
|
o_addQchr(dest, ch);
|
|
}
|
|
|
|
debug_printf("done reading from pipe, pclose()ing\n");
|
|
/* Note: we got EOF, and we just close the read end of the pipe.
|
|
* We do not wait for the `cmd` child to terminate. bash and ash do.
|
|
* Try these:
|
|
* echo `echo Hi; exec 1>&-; sleep 2` - bash waits 2 sec
|
|
* `false`; echo $? - bash outputs "1"
|
|
*/
|
|
fclose(pf);
|
|
debug_printf("closed FILE from child. return 0\n");
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int parse_group(o_string *dest, struct parse_context *ctx,
|
|
struct in_str *input, int ch)
|
|
{
|
|
/* dest contains characters seen prior to ( or {.
|
|
* Typically it's empty, but for function defs,
|
|
* it contains function name (without '()'). */
|
|
struct pipe *pipe_list;
|
|
int endch;
|
|
struct command *command = ctx->command;
|
|
|
|
debug_printf_parse("parse_group entered\n");
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
if (ch == '(' && !dest->o_quoted) {
|
|
if (dest->length)
|
|
if (done_word(dest, ctx))
|
|
return 1;
|
|
if (!command->argv)
|
|
goto skip; /* (... */
|
|
if (command->argv[1]) { /* word word ... (... */
|
|
syntax_error_unexpected_ch('(');
|
|
return 1;
|
|
}
|
|
/* it is "word(..." or "word (..." */
|
|
do
|
|
ch = i_getch(input);
|
|
while (ch == ' ' || ch == '\t');
|
|
if (ch != ')') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
do
|
|
ch = i_getch(input);
|
|
while (ch == ' ' || ch == '\t' || ch == '\n');
|
|
if (ch != '{') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
command->grp_type = GRP_FUNCTION;
|
|
goto skip;
|
|
}
|
|
#endif
|
|
if (command->argv /* word [word]{... */
|
|
|| dest->length /* word{... */
|
|
|| dest->o_quoted /* ""{... */
|
|
) {
|
|
syntax_error(NULL);
|
|
debug_printf_parse("parse_group return 1: "
|
|
"syntax error, groups and arglists don't mix\n");
|
|
return 1;
|
|
}
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
skip:
|
|
#endif
|
|
endch = '}';
|
|
if (ch == '(') {
|
|
endch = ')';
|
|
command->grp_type = GRP_SUBSHELL;
|
|
} else {
|
|
/* bash does not allow "{echo...", requires whitespace */
|
|
ch = i_getch(input);
|
|
if (ch != ' ' && ch != '\t' && ch != '\n') {
|
|
syntax_error_unexpected_ch(ch);
|
|
return 1;
|
|
}
|
|
nommu_addchr(&ctx->as_string, ch);
|
|
}
|
|
|
|
{
|
|
#if !BB_MMU
|
|
char *as_string = NULL;
|
|
#endif
|
|
pipe_list = parse_stream(&as_string, input, endch);
|
|
#if !BB_MMU
|
|
if (as_string)
|
|
o_addstr(&ctx->as_string, as_string);
|
|
#endif
|
|
/* empty ()/{} or parse error? */
|
|
if (!pipe_list || pipe_list == ERR_PTR) {
|
|
/* parse_stream already emitted error msg */
|
|
#if !BB_MMU
|
|
free(as_string);
|
|
#endif
|
|
debug_printf_parse("parse_group return 1: "
|
|
"parse_stream returned %p\n", pipe_list);
|
|
return 1;
|
|
}
|
|
command->group = pipe_list;
|
|
#if !BB_MMU
|
|
as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
|
|
command->group_as_string = as_string;
|
|
debug_printf_parse("end of group, remembering as:'%s'\n",
|
|
command->group_as_string);
|
|
#endif
|
|
}
|
|
debug_printf_parse("parse_group return 0\n");
|
|
return 0;
|
|
/* command remains "open", available for possible redirects */
|
|
}
|
|
|
|
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT
|
|
/* Subroutines for copying $(...) and `...` things */
|
|
static void add_till_backquote(o_string *dest, struct in_str *input);
|
|
/* '...' */
|
|
static void add_till_single_quote(o_string *dest, struct in_str *input)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('\'');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
if (ch == '\'')
|
|
return;
|
|
o_addchr(dest, ch);
|
|
}
|
|
}
|
|
/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
|
|
static void add_till_double_quote(o_string *dest, struct in_str *input)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('"');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
if (ch == '"')
|
|
return;
|
|
if (ch == '\\') { /* \x. Copy both chars. */
|
|
o_addchr(dest, ch);
|
|
ch = i_getch(input);
|
|
}
|
|
o_addchr(dest, ch);
|
|
if (ch == '`') {
|
|
add_till_backquote(dest, input);
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
//if (ch == '$') ...
|
|
}
|
|
}
|
|
/* Process `cmd` - copy contents until "`" is seen. Complicated by
|
|
* \` quoting.
|
|
* "Within the backquoted style of command substitution, backslash
|
|
* shall retain its literal meaning, except when followed by: '$', '`', or '\'.
|
|
* The search for the matching backquote shall be satisfied by the first
|
|
* backquote found without a preceding backslash; during this search,
|
|
* if a non-escaped backquote is encountered within a shell comment,
|
|
* a here-document, an embedded command substitution of the $(command)
|
|
* form, or a quoted string, undefined results occur. A single-quoted
|
|
* or double-quoted string that begins, but does not end, within the
|
|
* "`...`" sequence produces undefined results."
|
|
* Example Output
|
|
* echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
|
|
*/
|
|
static void add_till_backquote(o_string *dest, struct in_str *input)
|
|
{
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('`');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
if (ch == '`')
|
|
return;
|
|
if (ch == '\\') {
|
|
/* \x. Copy both chars unless it is \` */
|
|
int ch2 = i_getch(input);
|
|
if (ch2 == EOF) {
|
|
syntax_error_unterm_ch('`');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
|
|
o_addchr(dest, ch);
|
|
ch = ch2;
|
|
}
|
|
o_addchr(dest, ch);
|
|
}
|
|
}
|
|
/* Process $(cmd) - copy contents until ")" is seen. Complicated by
|
|
* quoting and nested ()s.
|
|
* "With the $(command) style of command substitution, all characters
|
|
* following the open parenthesis to the matching closing parenthesis
|
|
* constitute the command. Any valid shell script can be used for command,
|
|
* except a script consisting solely of redirections which produces
|
|
* unspecified results."
|
|
* Example Output
|
|
* echo $(echo '(TEST)' BEST) (TEST) BEST
|
|
* echo $(echo 'TEST)' BEST) TEST) BEST
|
|
* echo $(echo \(\(TEST\) BEST) ((TEST) BEST
|
|
*/
|
|
static void add_till_closing_paren(o_string *dest, struct in_str *input, bool dbl)
|
|
{
|
|
int count = 0;
|
|
while (1) {
|
|
int ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch(')');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
if (ch == '(')
|
|
count++;
|
|
if (ch == ')') {
|
|
if (--count < 0) {
|
|
if (!dbl)
|
|
break;
|
|
if (i_peek(input) == ')') {
|
|
i_getch(input);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
o_addchr(dest, ch);
|
|
if (ch == '\'') {
|
|
add_till_single_quote(dest, input);
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '"') {
|
|
add_till_double_quote(dest, input);
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
if (ch == '\\') {
|
|
/* \x. Copy verbatim. Important for \(, \) */
|
|
ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch(')');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
o_addchr(dest, ch);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT */
|
|
|
|
/* Return code: 0 for OK, 1 for syntax error */
|
|
#if BB_MMU
|
|
#define handle_dollar(as_string, dest, input) \
|
|
handle_dollar(dest, input)
|
|
#endif
|
|
static int handle_dollar(o_string *as_string,
|
|
o_string *dest,
|
|
struct in_str *input)
|
|
{
|
|
int expansion;
|
|
int ch = i_peek(input); /* first character after the $ */
|
|
unsigned char quote_mask = dest->o_escape ? 0x80 : 0;
|
|
|
|
debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
|
|
if (isalpha(ch)) {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
make_var:
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
while (1) {
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
o_addchr(dest, ch | quote_mask);
|
|
quote_mask = 0;
|
|
ch = i_peek(input);
|
|
if (!isalnum(ch) && ch != '_')
|
|
break;
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
}
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
} else if (isdigit(ch)) {
|
|
make_one_char_var:
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
o_addchr(dest, ch | quote_mask);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
} else switch (ch) {
|
|
case '$': /* pid */
|
|
case '!': /* last bg pid */
|
|
case '?': /* last exit code */
|
|
case '#': /* number of args */
|
|
case '*': /* args */
|
|
case '@': /* args */
|
|
goto make_one_char_var;
|
|
case '{': {
|
|
bool first_char, all_digits;
|
|
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
/* TODO: maybe someone will try to escape the '}' */
|
|
expansion = 0;
|
|
first_char = true;
|
|
all_digits = false;
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
if (ch == '}') {
|
|
break;
|
|
}
|
|
|
|
if (first_char) {
|
|
if (ch == '#') {
|
|
/* ${#var}: length of var contents */
|
|
goto char_ok;
|
|
}
|
|
if (isdigit(ch)) {
|
|
all_digits = true;
|
|
goto char_ok;
|
|
}
|
|
}
|
|
|
|
if (expansion < 2
|
|
&& ( (all_digits && !isdigit(ch))
|
|
|| (!all_digits && !isalnum(ch) && ch != '_')
|
|
)
|
|
) {
|
|
/* handle parameter expansions
|
|
* http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
|
|
*/
|
|
if (first_char)
|
|
goto case_default;
|
|
switch (ch) {
|
|
case ':': /* null modifier */
|
|
if (expansion == 0) {
|
|
debug_printf_parse(": null modifier\n");
|
|
++expansion;
|
|
break;
|
|
}
|
|
goto case_default;
|
|
case '#': /* remove prefix */
|
|
case '%': /* remove suffix */
|
|
if (expansion == 0) {
|
|
debug_printf_parse(": remove suffix/prefix\n");
|
|
expansion = 2;
|
|
break;
|
|
}
|
|
goto case_default;
|
|
case '-': /* default value */
|
|
case '=': /* assign default */
|
|
case '+': /* alternative */
|
|
case '?': /* error indicate */
|
|
debug_printf_parse(": parameter expansion\n");
|
|
expansion = 2;
|
|
break;
|
|
default:
|
|
case_default:
|
|
syntax_error_unterm_str("${name}");
|
|
debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
|
|
return 1;
|
|
}
|
|
}
|
|
char_ok:
|
|
debug_printf_parse(": '%c'\n", ch);
|
|
o_addchr(dest, ch | quote_mask);
|
|
quote_mask = 0;
|
|
first_char = false;
|
|
} /* while (1) */
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
break;
|
|
}
|
|
#if (ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK)
|
|
case '(': {
|
|
# if !BB_MMU
|
|
int pos;
|
|
# endif
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
# if ENABLE_SH_MATH_SUPPORT
|
|
if (i_peek(input) == '(') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, /*quote_mask |*/ '+');
|
|
# if !BB_MMU
|
|
pos = dest->length;
|
|
# endif
|
|
add_till_closing_paren(dest, input, true);
|
|
# if !BB_MMU
|
|
if (as_string) {
|
|
o_addstr(as_string, dest->data + pos);
|
|
o_addchr(as_string, ')');
|
|
o_addchr(as_string, ')');
|
|
}
|
|
# endif
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
break;
|
|
}
|
|
# endif
|
|
# if ENABLE_HUSH_TICK
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, quote_mask | '`');
|
|
# if !BB_MMU
|
|
pos = dest->length;
|
|
# endif
|
|
add_till_closing_paren(dest, input, false);
|
|
# if !BB_MMU
|
|
if (as_string) {
|
|
o_addstr(as_string, dest->data + pos);
|
|
o_addchr(as_string, '`');
|
|
}
|
|
# endif
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
# endif
|
|
break;
|
|
}
|
|
#endif
|
|
case '_':
|
|
ch = i_getch(input);
|
|
nommu_addchr(as_string, ch);
|
|
ch = i_peek(input);
|
|
if (isalnum(ch)) { /* it's $_name or $_123 */
|
|
ch = '_';
|
|
goto make_var;
|
|
}
|
|
/* else: it's $_ */
|
|
/* TODO: */
|
|
/* $_ Shell or shell script name; or last cmd name */
|
|
/* $- Option flags set by set builtin or shell options (-i etc) */
|
|
default:
|
|
o_addQchr(dest, '$');
|
|
}
|
|
debug_printf_parse("handle_dollar return 0\n");
|
|
return 0;
|
|
}
|
|
|
|
#if BB_MMU
|
|
#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
|
|
parse_stream_dquoted(dest, input, dquote_end)
|
|
#endif
|
|
static int parse_stream_dquoted(o_string *as_string,
|
|
o_string *dest,
|
|
struct in_str *input,
|
|
int dquote_end)
|
|
{
|
|
int ch;
|
|
int next;
|
|
|
|
again:
|
|
ch = i_getch(input);
|
|
if (ch != EOF)
|
|
nommu_addchr(as_string, ch);
|
|
if (ch == dquote_end) { /* may be only '"' or EOF */
|
|
if (dest->o_assignment == NOT_ASSIGNMENT)
|
|
dest->o_escape ^= 1;
|
|
debug_printf_parse("parse_stream_dquoted return 0\n");
|
|
return 0;
|
|
}
|
|
/* note: can't move it above ch == dquote_end check! */
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('"');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
next = '\0';
|
|
if (ch != '\n') {
|
|
next = i_peek(input);
|
|
}
|
|
debug_printf_parse(": ch=%c (%d) escape=%d\n",
|
|
ch, ch, dest->o_escape);
|
|
if (ch == '\\') {
|
|
if (next == EOF) {
|
|
syntax_error("\\<eof>");
|
|
xfunc_die();
|
|
}
|
|
/* bash:
|
|
* "The backslash retains its special meaning [in "..."]
|
|
* only when followed by one of the following characters:
|
|
* $, `, ", \, or <newline>. A double quote may be quoted
|
|
* within double quotes by preceding it with a backslash."
|
|
*/
|
|
if (strchr("$`\"\\\n", next) != NULL) {
|
|
ch = i_getch(input);
|
|
if (ch != '\n') {
|
|
o_addqchr(dest, ch);
|
|
nommu_addchr(as_string, ch);
|
|
}
|
|
} else {
|
|
o_addqchr(dest, '\\');
|
|
nommu_addchr(as_string, '\\');
|
|
}
|
|
goto again;
|
|
}
|
|
if (ch == '$') {
|
|
if (handle_dollar(as_string, dest, input) != 0) {
|
|
debug_printf_parse("parse_stream_dquoted return 1: "
|
|
"handle_dollar returned non-0\n");
|
|
return 1;
|
|
}
|
|
goto again;
|
|
}
|
|
#if ENABLE_HUSH_TICK
|
|
if (ch == '`') {
|
|
//int pos = dest->length;
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(dest, 0x80 | '`');
|
|
add_till_backquote(dest, input);
|
|
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
|
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
|
|
goto again;
|
|
}
|
|
#endif
|
|
o_addQchr(dest, ch);
|
|
if (ch == '='
|
|
&& (dest->o_assignment == MAYBE_ASSIGNMENT
|
|
|| dest->o_assignment == WORD_IS_KEYWORD)
|
|
&& is_well_formed_var_name(dest->data, '=')
|
|
) {
|
|
dest->o_assignment = DEFINITELY_ASSIGNMENT;
|
|
}
|
|
goto again;
|
|
}
|
|
|
|
/*
|
|
* Scan input until EOF or end_trigger char.
|
|
* Return a list of pipes to execute, or NULL on EOF
|
|
* or if end_trigger character is met.
|
|
* On syntax error, exit is shell is not interactive,
|
|
* reset parsing machinery and start parsing anew,
|
|
* or return ERR_PTR.
|
|
*/
|
|
static struct pipe *parse_stream(char **pstring,
|
|
struct in_str *input,
|
|
int end_trigger)
|
|
{
|
|
struct parse_context ctx;
|
|
o_string dest = NULL_O_STRING;
|
|
int is_in_dquote;
|
|
int heredoc_cnt;
|
|
|
|
/* Double-quote state is handled in the state variable is_in_dquote.
|
|
* A single-quote triggers a bypass of the main loop until its mate is
|
|
* found. When recursing, quote state is passed in via dest->o_escape.
|
|
*/
|
|
debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
|
|
end_trigger ? : 'X');
|
|
debug_enter();
|
|
|
|
G.ifs = get_local_var_value("IFS");
|
|
if (G.ifs == NULL)
|
|
G.ifs = " \t\n";
|
|
|
|
reset:
|
|
#if ENABLE_HUSH_INTERACTIVE
|
|
input->promptmode = 0; /* PS1 */
|
|
#endif
|
|
/* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */
|
|
initialize_context(&ctx);
|
|
is_in_dquote = 0;
|
|
heredoc_cnt = 0;
|
|
while (1) {
|
|
const char *is_ifs;
|
|
const char *is_special;
|
|
int ch;
|
|
int next;
|
|
int redir_fd;
|
|
redir_type redir_style;
|
|
|
|
if (is_in_dquote) {
|
|
/* dest.o_quoted = 1; - already is (see below) */
|
|
if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) {
|
|
goto parse_error;
|
|
}
|
|
/* We reached closing '"' */
|
|
is_in_dquote = 0;
|
|
}
|
|
ch = i_getch(input);
|
|
debug_printf_parse(": ch=%c (%d) escape=%d\n",
|
|
ch, ch, dest.o_escape);
|
|
if (ch == EOF) {
|
|
struct pipe *pi;
|
|
|
|
if (heredoc_cnt) {
|
|
syntax_error_unterm_str("here document");
|
|
goto parse_error;
|
|
}
|
|
/* end_trigger == '}' case errors out earlier,
|
|
* checking only ')' */
|
|
if (end_trigger == ')') {
|
|
syntax_error_unterm_ch('('); /* exits */
|
|
/* goto parse_error; */
|
|
}
|
|
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
o_free(&dest);
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
pi = ctx.list_head;
|
|
/* If we got nothing... */
|
|
/* (this makes bare "&" cmd a no-op.
|
|
* bash says: "syntax error near unexpected token '&'") */
|
|
if (pi->num_cmds == 0
|
|
IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
|
|
) {
|
|
free_pipe_list(pi);
|
|
pi = NULL;
|
|
}
|
|
#if !BB_MMU
|
|
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
|
if (pstring)
|
|
*pstring = ctx.as_string.data;
|
|
else
|
|
o_free_unsafe(&ctx.as_string);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_parse("parse_stream return %p\n", pi);
|
|
return pi;
|
|
}
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
is_ifs = strchr(G.ifs, ch);
|
|
is_special = strchr("<>;&|(){}#'" /* special outside of "str" */
|
|
"\\$\"" IF_HUSH_TICK("`") /* always special */
|
|
, ch);
|
|
|
|
if (!is_special && !is_ifs) { /* ordinary char */
|
|
ordinary_char:
|
|
o_addQchr(&dest, ch);
|
|
if ((dest.o_assignment == MAYBE_ASSIGNMENT
|
|
|| dest.o_assignment == WORD_IS_KEYWORD)
|
|
&& ch == '='
|
|
&& is_well_formed_var_name(dest.data, '=')
|
|
) {
|
|
dest.o_assignment = DEFINITELY_ASSIGNMENT;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (is_ifs) {
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
if (ch == '\n') {
|
|
#if ENABLE_HUSH_CASE
|
|
/* "case ... in <newline> word) ..." -
|
|
* newlines are ignored (but ';' wouldn't be) */
|
|
if (ctx.command->argv == NULL
|
|
&& ctx.ctx_res_w == RES_MATCH
|
|
) {
|
|
continue;
|
|
}
|
|
#endif
|
|
/* Treat newline as a command separator. */
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
debug_printf_parse("heredoc_cnt:%d\n", heredoc_cnt);
|
|
if (heredoc_cnt) {
|
|
if (fetch_heredocs(heredoc_cnt, &ctx, input)) {
|
|
goto parse_error;
|
|
}
|
|
heredoc_cnt = 0;
|
|
}
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
ch = ';';
|
|
/* note: if (is_ifs) continue;
|
|
* will still trigger for us */
|
|
}
|
|
}
|
|
|
|
/* "cmd}" or "cmd }..." without semicolon or &:
|
|
* } is an ordinary char in this case, even inside { cmd; }
|
|
* Pathological example: { ""}; } should exec "}" cmd
|
|
*/
|
|
if (ch == '}') {
|
|
if (!IS_NULL_CMD(ctx.command) /* cmd } */
|
|
|| dest.length != 0 /* word} */
|
|
|| dest.o_quoted /* ""} */
|
|
) {
|
|
goto ordinary_char;
|
|
}
|
|
if (!IS_NULL_PIPE(ctx.pipe)) /* cmd | } */
|
|
goto skip_end_trigger;
|
|
/* else: } does terminate a group */
|
|
}
|
|
|
|
if (end_trigger && end_trigger == ch
|
|
&& (ch != ';' || heredoc_cnt == 0)
|
|
#if ENABLE_HUSH_CASE
|
|
&& (ch != ')'
|
|
|| ctx.ctx_res_w != RES_MATCH
|
|
|| (!dest.o_quoted && strcmp(dest.data, "esac") == 0)
|
|
)
|
|
#endif
|
|
) {
|
|
if (heredoc_cnt) {
|
|
/* This is technically valid:
|
|
* { cat <<HERE; }; echo Ok
|
|
* heredoc
|
|
* heredoc
|
|
* HERE
|
|
* but we don't support this.
|
|
* We require heredoc to be in enclosing {}/(),
|
|
* if any.
|
|
*/
|
|
syntax_error_unterm_str("here document");
|
|
goto parse_error;
|
|
}
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
/* Do we sit outside of any if's, loops or case's? */
|
|
if (!HAS_KEYWORDS
|
|
IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
|
|
) {
|
|
o_free(&dest);
|
|
#if !BB_MMU
|
|
debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
|
|
if (pstring)
|
|
*pstring = ctx.as_string.data;
|
|
else
|
|
o_free_unsafe(&ctx.as_string);
|
|
#endif
|
|
debug_leave();
|
|
debug_printf_parse("parse_stream return %p: "
|
|
"end_trigger char found\n",
|
|
ctx.list_head);
|
|
return ctx.list_head;
|
|
}
|
|
}
|
|
skip_end_trigger:
|
|
if (is_ifs)
|
|
continue;
|
|
|
|
next = '\0';
|
|
if (ch != '\n') {
|
|
next = i_peek(input);
|
|
}
|
|
|
|
/* Catch <, > before deciding whether this word is
|
|
* an assignment. a=1 2>z b=2: b=2 is still assignment */
|
|
switch (ch) {
|
|
case '>':
|
|
redir_fd = redirect_opt_num(&dest);
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
redir_style = REDIRECT_OVERWRITE;
|
|
if (next == '>') {
|
|
redir_style = REDIRECT_APPEND;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
}
|
|
#if 0
|
|
else if (next == '(') {
|
|
syntax_error(">(process) not supported");
|
|
goto parse_error;
|
|
}
|
|
#endif
|
|
if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
|
goto parse_error;
|
|
continue; /* back to top of while (1) */
|
|
case '<':
|
|
redir_fd = redirect_opt_num(&dest);
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
redir_style = REDIRECT_INPUT;
|
|
if (next == '<') {
|
|
redir_style = REDIRECT_HEREDOC;
|
|
heredoc_cnt++;
|
|
debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
} else if (next == '>') {
|
|
redir_style = REDIRECT_IO;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
}
|
|
#if 0
|
|
else if (next == '(') {
|
|
syntax_error("<(process) not supported");
|
|
goto parse_error;
|
|
}
|
|
#endif
|
|
if (parse_redirect(&ctx, redir_fd, redir_style, input))
|
|
goto parse_error;
|
|
continue; /* back to top of while (1) */
|
|
}
|
|
|
|
if (dest.o_assignment == MAYBE_ASSIGNMENT
|
|
/* check that we are not in word in "a=1 2>word b=1": */
|
|
&& !ctx.pending_redirect
|
|
) {
|
|
/* ch is a special char and thus this word
|
|
* cannot be an assignment */
|
|
dest.o_assignment = NOT_ASSIGNMENT;
|
|
}
|
|
|
|
switch (ch) {
|
|
case '#':
|
|
if (dest.length == 0) {
|
|
while (1) {
|
|
ch = i_peek(input);
|
|
if (ch == EOF || ch == '\n')
|
|
break;
|
|
i_getch(input);
|
|
/* note: we do not add it to &ctx.as_string */
|
|
}
|
|
nommu_addchr(&ctx.as_string, '\n');
|
|
} else {
|
|
o_addQchr(&dest, ch);
|
|
}
|
|
break;
|
|
case '\\':
|
|
if (next == EOF) {
|
|
syntax_error("\\<eof>");
|
|
xfunc_die();
|
|
}
|
|
ch = i_getch(input);
|
|
if (ch != '\n') {
|
|
o_addchr(&dest, '\\');
|
|
nommu_addchr(&ctx.as_string, '\\');
|
|
o_addchr(&dest, ch);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
/* Example: echo Hello \2>file
|
|
* we need to know that word 2 is quoted */
|
|
dest.o_quoted = 1;
|
|
}
|
|
break;
|
|
case '$':
|
|
if (handle_dollar(&ctx.as_string, &dest, input) != 0) {
|
|
debug_printf_parse("parse_stream parse error: "
|
|
"handle_dollar returned non-0\n");
|
|
goto parse_error;
|
|
}
|
|
break;
|
|
case '\'':
|
|
dest.o_quoted = 1;
|
|
while (1) {
|
|
ch = i_getch(input);
|
|
if (ch == EOF) {
|
|
syntax_error_unterm_ch('\'');
|
|
/*xfunc_die(); - redundant */
|
|
}
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
if (ch == '\'')
|
|
break;
|
|
o_addqchr(&dest, ch);
|
|
}
|
|
break;
|
|
case '"':
|
|
dest.o_quoted = 1;
|
|
is_in_dquote ^= 1; /* invert */
|
|
if (dest.o_assignment == NOT_ASSIGNMENT)
|
|
dest.o_escape ^= 1;
|
|
break;
|
|
#if ENABLE_HUSH_TICK
|
|
case '`': {
|
|
#if !BB_MMU
|
|
int pos;
|
|
#endif
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
o_addchr(&dest, '`');
|
|
#if !BB_MMU
|
|
pos = dest.length;
|
|
#endif
|
|
add_till_backquote(&dest, input);
|
|
#if !BB_MMU
|
|
o_addstr(&ctx.as_string, dest.data + pos);
|
|
o_addchr(&ctx.as_string, '`');
|
|
#endif
|
|
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
|
|
//debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
|
|
break;
|
|
}
|
|
#endif
|
|
case ';':
|
|
#if ENABLE_HUSH_CASE
|
|
case_semi:
|
|
#endif
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
done_pipe(&ctx, PIPE_SEQ);
|
|
#if ENABLE_HUSH_CASE
|
|
/* Eat multiple semicolons, detect
|
|
* whether it means something special */
|
|
while (1) {
|
|
ch = i_peek(input);
|
|
if (ch != ';')
|
|
break;
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
if (ctx.ctx_res_w == RES_CASE_BODY) {
|
|
ctx.ctx_dsemicolon = 1;
|
|
ctx.ctx_res_w = RES_MATCH;
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
new_cmd:
|
|
/* We just finished a cmd. New one may start
|
|
* with an assignment */
|
|
dest.o_assignment = MAYBE_ASSIGNMENT;
|
|
break;
|
|
case '&':
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
if (next == '&') {
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
done_pipe(&ctx, PIPE_AND);
|
|
} else {
|
|
done_pipe(&ctx, PIPE_BG);
|
|
}
|
|
goto new_cmd;
|
|
case '|':
|
|
if (done_word(&dest, &ctx)) {
|
|
goto parse_error;
|
|
}
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx.ctx_res_w == RES_MATCH)
|
|
break; /* we are in case's "word | word)" */
|
|
#endif
|
|
if (next == '|') { /* || */
|
|
ch = i_getch(input);
|
|
nommu_addchr(&ctx.as_string, ch);
|
|
done_pipe(&ctx, PIPE_OR);
|
|
} else {
|
|
/* we could pick up a file descriptor choice here
|
|
* with redirect_opt_num(), but bash doesn't do it.
|
|
* "echo foo 2| cat" yields "foo 2". */
|
|
done_command(&ctx);
|
|
}
|
|
goto new_cmd;
|
|
case '(':
|
|
#if ENABLE_HUSH_CASE
|
|
/* "case... in [(]word)..." - skip '(' */
|
|
if (ctx.ctx_res_w == RES_MATCH
|
|
&& ctx.command->argv == NULL /* not (word|(... */
|
|
&& dest.length == 0 /* not word(... */
|
|
&& dest.o_quoted == 0 /* not ""(... */
|
|
) {
|
|
continue;
|
|
}
|
|
#endif
|
|
case '{':
|
|
if (parse_group(&dest, &ctx, input, ch) != 0) {
|
|
goto parse_error;
|
|
}
|
|
goto new_cmd;
|
|
case ')':
|
|
#if ENABLE_HUSH_CASE
|
|
if (ctx.ctx_res_w == RES_MATCH)
|
|
goto case_semi;
|
|
#endif
|
|
case '}':
|
|
/* proper use of this character is caught by end_trigger:
|
|
* if we see {, we call parse_group(..., end_trigger='}')
|
|
* and it will match } earlier (not here). */
|
|
syntax_error_unexpected_ch(ch);
|
|
goto parse_error;
|
|
default:
|
|
if (HUSH_DEBUG)
|
|
bb_error_msg_and_die("BUG: unexpected %c\n", ch);
|
|
}
|
|
} /* while (1) */
|
|
|
|
parse_error:
|
|
{
|
|
struct parse_context *pctx;
|
|
IF_HAS_KEYWORDS(struct parse_context *p2;)
|
|
|
|
/* Clean up allocated tree.
|
|
* Samples for finding leaks on syntax error recovery path.
|
|
* Run them from interactive shell, watch pmap `pidof hush`.
|
|
* while if false; then false; fi do break; done
|
|
* (bash accepts it)
|
|
* while if false; then false; fi; do break; fi
|
|
* Samples to catch leaks at execution:
|
|
* while if (true | {true;}); then echo ok; fi; do break; done
|
|
* while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
|
|
*/
|
|
pctx = &ctx;
|
|
do {
|
|
/* Update pipe/command counts,
|
|
* otherwise freeing may miss some */
|
|
done_pipe(pctx, PIPE_SEQ);
|
|
debug_printf_clean("freeing list %p from ctx %p\n",
|
|
pctx->list_head, pctx);
|
|
debug_print_tree(pctx->list_head, 0);
|
|
free_pipe_list(pctx->list_head);
|
|
debug_printf_clean("freed list %p\n", pctx->list_head);
|
|
#if !BB_MMU
|
|
o_free_unsafe(&pctx->as_string);
|
|
#endif
|
|
IF_HAS_KEYWORDS(p2 = pctx->stack;)
|
|
if (pctx != &ctx) {
|
|
free(pctx);
|
|
}
|
|
IF_HAS_KEYWORDS(pctx = p2;)
|
|
} while (HAS_KEYWORDS && pctx);
|
|
/* Free text, clear all dest fields */
|
|
o_free(&dest);
|
|
/* If we are not in top-level parse, we return,
|
|
* our caller will propagate error.
|
|
*/
|
|
if (end_trigger != ';') {
|
|
#if !BB_MMU
|
|
if (pstring)
|
|
*pstring = NULL;
|
|
#endif
|
|
debug_leave();
|
|
return ERR_PTR;
|
|
}
|
|
/* Discard cached input, force prompt */
|
|
input->p = NULL;
|
|
IF_HUSH_INTERACTIVE(input->promptme = 1;)
|
|
goto reset;
|
|
}
|
|
}
|
|
|
|
/* Executing from string: eval, sh -c '...'
|
|
* or from file: /etc/profile, . file, sh <script>, sh (intereactive)
|
|
* end_trigger controls how often we stop parsing
|
|
* NUL: parse all, execute, return
|
|
* ';': parse till ';' or newline, execute, repeat till EOF
|
|
*/
|
|
static void parse_and_run_stream(struct in_str *inp, int end_trigger)
|
|
{
|
|
while (1) {
|
|
struct pipe *pipe_list;
|
|
|
|
pipe_list = parse_stream(NULL, inp, end_trigger);
|
|
if (!pipe_list) /* EOF */
|
|
break;
|
|
debug_print_tree(pipe_list, 0);
|
|
debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
|
|
run_and_free_list(pipe_list);
|
|
}
|
|
}
|
|
|
|
static void parse_and_run_string(const char *s)
|
|
{
|
|
struct in_str input;
|
|
setup_string_in_str(&input, s);
|
|
parse_and_run_stream(&input, '\0');
|
|
}
|
|
|
|
static void parse_and_run_file(FILE *f)
|
|
{
|
|
struct in_str input;
|
|
setup_file_in_str(&input, f);
|
|
parse_and_run_stream(&input, ';');
|
|
}
|
|
|
|
/* Called a few times only (or even once if "sh -c") */
|
|
static void block_signals(int second_time)
|
|
{
|
|
unsigned sig;
|
|
unsigned mask;
|
|
|
|
mask = (1 << SIGQUIT);
|
|
if (G_interactive_fd) {
|
|
mask = (1 << SIGQUIT) | SPECIAL_INTERACTIVE_SIGS;
|
|
if (G_saved_tty_pgrp) /* we have ctty, job control sigs work */
|
|
mask |= SPECIAL_JOB_SIGS;
|
|
}
|
|
G.non_DFL_mask = mask;
|
|
|
|
if (!second_time)
|
|
sigprocmask(SIG_SETMASK, NULL, &G.blocked_set);
|
|
sig = 0;
|
|
while (mask) {
|
|
if (mask & 1)
|
|
sigaddset(&G.blocked_set, sig);
|
|
mask >>= 1;
|
|
sig++;
|
|
}
|
|
sigdelset(&G.blocked_set, SIGCHLD);
|
|
|
|
sigprocmask(SIG_SETMASK, &G.blocked_set,
|
|
second_time ? NULL : &G.inherited_set);
|
|
/* POSIX allows shell to re-enable SIGCHLD
|
|
* even if it was SIG_IGN on entry */
|
|
#if ENABLE_HUSH_FAST
|
|
G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
|
|
if (!second_time)
|
|
signal(SIGCHLD, SIGCHLD_handler);
|
|
#else
|
|
if (!second_time)
|
|
signal(SIGCHLD, SIG_DFL);
|
|
#endif
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* helper */
|
|
static void maybe_set_to_sigexit(int sig)
|
|
{
|
|
void (*handler)(int);
|
|
/* non_DFL_mask'ed signals are, well, masked,
|
|
* no need to set handler for them.
|
|
*/
|
|
if (!((G.non_DFL_mask >> sig) & 1)) {
|
|
handler = signal(sig, sigexit);
|
|
if (handler == SIG_IGN) /* oops... restore back to IGN! */
|
|
signal(sig, handler);
|
|
}
|
|
}
|
|
/* Set handlers to restore tty pgrp and exit */
|
|
static void set_fatal_handlers(void)
|
|
{
|
|
/* We _must_ restore tty pgrp on fatal signals */
|
|
if (HUSH_DEBUG) {
|
|
maybe_set_to_sigexit(SIGILL );
|
|
maybe_set_to_sigexit(SIGFPE );
|
|
maybe_set_to_sigexit(SIGBUS );
|
|
maybe_set_to_sigexit(SIGSEGV);
|
|
maybe_set_to_sigexit(SIGTRAP);
|
|
} /* else: hush is perfect. what SEGV? */
|
|
maybe_set_to_sigexit(SIGABRT);
|
|
/* bash 3.2 seems to handle these just like 'fatal' ones */
|
|
maybe_set_to_sigexit(SIGPIPE);
|
|
maybe_set_to_sigexit(SIGALRM);
|
|
/* if we are interactive, SIGHUP, SIGTERM and SIGINT are masked.
|
|
* if we aren't interactive... but in this case
|
|
* we never want to restore pgrp on exit, and this fn is not called */
|
|
/*maybe_set_to_sigexit(SIGHUP );*/
|
|
/*maybe_set_to_sigexit(SIGTERM);*/
|
|
/*maybe_set_to_sigexit(SIGINT );*/
|
|
}
|
|
#endif
|
|
|
|
static int set_mode(const char cstate, const char mode)
|
|
{
|
|
int state = (cstate == '-' ? 1 : 0);
|
|
switch (mode) {
|
|
case 'n': G.fake_mode = state; break;
|
|
case 'x': /*G.debug_mode = state;*/ break;
|
|
default: return EXIT_FAILURE;
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int hush_main(int argc, char **argv)
|
|
{
|
|
static const struct variable const_shell_ver = {
|
|
.next = NULL,
|
|
.varstr = (char*)hush_version_str,
|
|
.max_len = 1, /* 0 can provoke free(name) */
|
|
.flg_export = 1,
|
|
.flg_read_only = 1,
|
|
};
|
|
int signal_mask_is_inited = 0;
|
|
int opt;
|
|
char **e;
|
|
struct variable *cur_var;
|
|
|
|
INIT_G();
|
|
if (EXIT_SUCCESS) /* if EXIT_SUCCESS == 0, is already done */
|
|
G.last_exitcode = EXIT_SUCCESS;
|
|
#if !BB_MMU
|
|
G.argv0_for_re_execing = argv[0];
|
|
#endif
|
|
/* Deal with HUSH_VERSION */
|
|
G.shell_ver = const_shell_ver; /* copying struct here */
|
|
G.top_var = &G.shell_ver;
|
|
debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
|
|
unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
|
|
/* Initialize our shell local variables with the values
|
|
* currently living in the environment */
|
|
cur_var = G.top_var;
|
|
e = environ;
|
|
if (e) while (*e) {
|
|
char *value = strchr(*e, '=');
|
|
if (value) { /* paranoia */
|
|
cur_var->next = xzalloc(sizeof(*cur_var));
|
|
cur_var = cur_var->next;
|
|
cur_var->varstr = *e;
|
|
cur_var->max_len = strlen(*e);
|
|
cur_var->flg_export = 1;
|
|
}
|
|
e++;
|
|
}
|
|
debug_printf_env("putenv '%s'\n", hush_version_str);
|
|
putenv((char *)hush_version_str); /* reinstate HUSH_VERSION */
|
|
#if ENABLE_FEATURE_EDITING
|
|
G.line_input_state = new_line_input_t(FOR_SHELL);
|
|
#endif
|
|
G.global_argc = argc;
|
|
G.global_argv = argv;
|
|
/* Initialize some more globals to non-zero values */
|
|
set_cwd();
|
|
cmdedit_update_prompt();
|
|
|
|
if (setjmp(die_jmp)) {
|
|
/* xfunc has failed! die die die */
|
|
/* no EXIT traps, this is an escape hatch! */
|
|
G.exiting = 1;
|
|
hush_exit(xfunc_error_retval);
|
|
}
|
|
|
|
/* Shell is non-interactive at first. We need to call
|
|
* block_signals(0) if we are going to execute "sh <script>",
|
|
* "sh -c <cmds>" or login shell's /etc/profile and friends.
|
|
* If we later decide that we are interactive, we run block_signals(0)
|
|
* (or re-run block_signals(1) if we ran block_signals(0) before)
|
|
* in order to intercept (more) signals.
|
|
*/
|
|
|
|
/* Parse options */
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
|
|
while (1) {
|
|
opt = getopt(argc, argv, "c:xins"
|
|
#if !BB_MMU
|
|
"<:$:R:V:"
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
"F:"
|
|
# endif
|
|
#endif
|
|
);
|
|
if (opt <= 0)
|
|
break;
|
|
switch (opt) {
|
|
case 'c':
|
|
if (!G.root_pid)
|
|
G.root_pid = getpid();
|
|
G.global_argv = argv + optind;
|
|
if (!argv[optind]) {
|
|
/* -c 'script' (no params): prevent empty $0 */
|
|
*--G.global_argv = argv[0];
|
|
optind--;
|
|
} /* else -c 'script' PAR0 PAR1: $0 is PAR0 */
|
|
G.global_argc = argc - optind;
|
|
block_signals(0); /* 0: called 1st time */
|
|
parse_and_run_string(optarg);
|
|
goto final_return;
|
|
case 'i':
|
|
/* Well, we cannot just declare interactiveness,
|
|
* we have to have some stuff (ctty, etc) */
|
|
/* G_interactive_fd++; */
|
|
break;
|
|
case 's':
|
|
/* "-s" means "read from stdin", but this is how we always
|
|
* operate, so simply do nothing here. */
|
|
break;
|
|
#if !BB_MMU
|
|
case '<': /* "big heredoc" support */
|
|
full_write(STDOUT_FILENO, optarg, strlen(optarg));
|
|
_exit(0);
|
|
case '$':
|
|
G.root_pid = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
|
|
optarg++;
|
|
G.last_exitcode = bb_strtou(optarg, &optarg, 16);
|
|
# if ENABLE_HUSH_LOOPS
|
|
optarg++;
|
|
G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
|
|
# endif
|
|
break;
|
|
case 'R':
|
|
case 'V':
|
|
set_local_var(xstrdup(optarg), 0, opt == 'R');
|
|
break;
|
|
# if ENABLE_HUSH_FUNCTIONS
|
|
case 'F': {
|
|
struct function *funcp = new_function(optarg);
|
|
/* funcp->name is already set to optarg */
|
|
/* funcp->body is set to NULL. It's a special case. */
|
|
funcp->body_as_string = argv[optind];
|
|
optind++;
|
|
break;
|
|
}
|
|
# endif
|
|
#endif
|
|
case 'n':
|
|
case 'x':
|
|
if (!set_mode('-', opt))
|
|
break;
|
|
default:
|
|
#ifndef BB_VER
|
|
fprintf(stderr, "Usage: sh [FILE]...\n"
|
|
" or: sh -c command [args]...\n\n");
|
|
exit(EXIT_FAILURE);
|
|
#else
|
|
bb_show_usage();
|
|
#endif
|
|
}
|
|
} /* option parsing loop */
|
|
|
|
if (!G.root_pid)
|
|
G.root_pid = getpid();
|
|
|
|
/* If we are login shell... */
|
|
if (argv[0] && argv[0][0] == '-') {
|
|
FILE *input;
|
|
debug_printf("sourcing /etc/profile\n");
|
|
input = fopen_for_read("/etc/profile");
|
|
if (input != NULL) {
|
|
close_on_exec_on(fileno(input));
|
|
block_signals(0); /* 0: called 1st time */
|
|
signal_mask_is_inited = 1;
|
|
parse_and_run_file(input);
|
|
fclose(input);
|
|
}
|
|
/* bash: after sourcing /etc/profile,
|
|
* tries to source (in the given order):
|
|
* ~/.bash_profile, ~/.bash_login, ~/.profile,
|
|
* stopping on first found. --noprofile turns this off.
|
|
* bash also sources ~/.bash_logout on exit.
|
|
* If called as sh, skips .bash_XXX files.
|
|
*/
|
|
}
|
|
|
|
if (argv[optind]) {
|
|
FILE *input;
|
|
/*
|
|
* "bash <script>" (which is never interactive (unless -i?))
|
|
* sources $BASH_ENV here (without scanning $PATH).
|
|
* If called as sh, does the same but with $ENV.
|
|
*/
|
|
debug_printf("running script '%s'\n", argv[optind]);
|
|
G.global_argv = argv + optind;
|
|
G.global_argc = argc - optind;
|
|
input = xfopen_for_read(argv[optind]);
|
|
close_on_exec_on(fileno(input));
|
|
if (!signal_mask_is_inited)
|
|
block_signals(0); /* 0: called 1st time */
|
|
parse_and_run_file(input);
|
|
#if ENABLE_FEATURE_CLEAN_UP
|
|
fclose(input);
|
|
#endif
|
|
goto final_return;
|
|
}
|
|
|
|
/* Up to here, shell was non-interactive. Now it may become one.
|
|
* NB: don't forget to (re)run block_signals(0/1) as needed.
|
|
*/
|
|
|
|
/* A shell is interactive if the '-i' flag was given,
|
|
* or if all of the following conditions are met:
|
|
* no -c command
|
|
* no arguments remaining or the -s flag given
|
|
* standard input is a terminal
|
|
* standard output is a terminal
|
|
* Refer to Posix.2, the description of the 'sh' utility.
|
|
*/
|
|
#if ENABLE_HUSH_JOB
|
|
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
|
G_saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
|
|
debug_printf("saved_tty_pgrp:%d\n", G_saved_tty_pgrp);
|
|
if (G_saved_tty_pgrp < 0)
|
|
G_saved_tty_pgrp = 0;
|
|
|
|
/* try to dup stdin to high fd#, >= 255 */
|
|
G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
|
if (G_interactive_fd < 0) {
|
|
/* try to dup to any fd */
|
|
G_interactive_fd = dup(STDIN_FILENO);
|
|
if (G_interactive_fd < 0) {
|
|
/* give up */
|
|
G_interactive_fd = 0;
|
|
G_saved_tty_pgrp = 0;
|
|
}
|
|
}
|
|
// TODO: track & disallow any attempts of user
|
|
// to (inadvertently) close/redirect G_interactive_fd
|
|
}
|
|
debug_printf("interactive_fd:%d\n", G_interactive_fd);
|
|
if (G_interactive_fd) {
|
|
close_on_exec_on(G_interactive_fd);
|
|
|
|
if (G_saved_tty_pgrp) {
|
|
/* If we were run as 'hush &', sleep until we are
|
|
* in the foreground (tty pgrp == our pgrp).
|
|
* If we get started under a job aware app (like bash),
|
|
* make sure we are now in charge so we don't fight over
|
|
* who gets the foreground */
|
|
while (1) {
|
|
pid_t shell_pgrp = getpgrp();
|
|
G_saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
|
|
if (G_saved_tty_pgrp == shell_pgrp)
|
|
break;
|
|
/* send TTIN to ourself (should stop us) */
|
|
kill(- shell_pgrp, SIGTTIN);
|
|
}
|
|
}
|
|
|
|
/* Block some signals */
|
|
block_signals(signal_mask_is_inited);
|
|
|
|
if (G_saved_tty_pgrp) {
|
|
/* Set other signals to restore saved_tty_pgrp */
|
|
set_fatal_handlers();
|
|
/* Put ourselves in our own process group
|
|
* (bash, too, does this only if ctty is available) */
|
|
bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
|
|
/* Grab control of the terminal */
|
|
tcsetpgrp(G_interactive_fd, getpid());
|
|
}
|
|
/* -1 is special - makes xfuncs longjmp, not exit
|
|
* (we reset die_sleep = 0 whereever we [v]fork) */
|
|
enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */
|
|
} else if (!signal_mask_is_inited) {
|
|
block_signals(0); /* 0: called 1st time */
|
|
} /* else: block_signals(0) was done before */
|
|
#elif ENABLE_HUSH_INTERACTIVE
|
|
/* No job control compiled in, only prompt/line editing */
|
|
if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
|
|
G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
|
if (G_interactive_fd < 0) {
|
|
/* try to dup to any fd */
|
|
G_interactive_fd = dup(STDIN_FILENO);
|
|
if (G_interactive_fd < 0)
|
|
/* give up */
|
|
G_interactive_fd = 0;
|
|
}
|
|
}
|
|
if (G_interactive_fd) {
|
|
close_on_exec_on(G_interactive_fd);
|
|
block_signals(signal_mask_is_inited);
|
|
} else if (!signal_mask_is_inited) {
|
|
block_signals(0);
|
|
}
|
|
#else
|
|
/* We have interactiveness code disabled */
|
|
if (!signal_mask_is_inited) {
|
|
block_signals(0);
|
|
}
|
|
#endif
|
|
/* bash:
|
|
* if interactive but not a login shell, sources ~/.bashrc
|
|
* (--norc turns this off, --rcfile <file> overrides)
|
|
*/
|
|
|
|
if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
|
|
printf("\n\n%s hush - the humble shell\n", bb_banner);
|
|
if (ENABLE_HUSH_HELP)
|
|
puts("Enter 'help' for a list of built-in commands.");
|
|
puts("");
|
|
}
|
|
|
|
parse_and_run_file(stdin);
|
|
|
|
final_return:
|
|
#if ENABLE_FEATURE_CLEAN_UP
|
|
if (G.cwd != bb_msg_unknown)
|
|
free((char*)G.cwd);
|
|
cur_var = G.top_var->next;
|
|
while (cur_var) {
|
|
struct variable *tmp = cur_var;
|
|
if (!cur_var->max_len)
|
|
free(cur_var->varstr);
|
|
cur_var = cur_var->next;
|
|
free(tmp);
|
|
}
|
|
#endif
|
|
hush_exit(G.last_exitcode);
|
|
}
|
|
|
|
|
|
#if ENABLE_LASH
|
|
int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int lash_main(int argc, char **argv)
|
|
{
|
|
//bb_error_msg("lash is deprecated, please use hush instead");
|
|
return hush_main(argc, argv);
|
|
}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Built-ins
|
|
*/
|
|
static int builtin_true(char **argv UNUSED_PARAM)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int builtin_test(char **argv)
|
|
{
|
|
int argc = 0;
|
|
while (*argv) {
|
|
argc++;
|
|
argv++;
|
|
}
|
|
return test_main(argc, argv - argc);
|
|
}
|
|
|
|
static int builtin_echo(char **argv)
|
|
{
|
|
int argc = 0;
|
|
while (*argv) {
|
|
argc++;
|
|
argv++;
|
|
}
|
|
return echo_main(argc, argv - argc);
|
|
}
|
|
|
|
static int builtin_eval(char **argv)
|
|
{
|
|
int rcode = EXIT_SUCCESS;
|
|
|
|
if (*++argv) {
|
|
char *str = expand_strvec_to_string(argv);
|
|
/* bash:
|
|
* eval "echo Hi; done" ("done" is syntax error):
|
|
* "echo Hi" will not execute too.
|
|
*/
|
|
parse_and_run_string(str);
|
|
free(str);
|
|
rcode = G.last_exitcode;
|
|
}
|
|
return rcode;
|
|
}
|
|
|
|
static int builtin_cd(char **argv)
|
|
{
|
|
const char *newdir = argv[1];
|
|
if (newdir == NULL) {
|
|
/* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
|
|
* bash says "bash: cd: HOME not set" and does nothing
|
|
* (exitcode 1)
|
|
*/
|
|
newdir = get_local_var_value("HOME") ? : "/";
|
|
}
|
|
if (chdir(newdir)) {
|
|
/* Mimic bash message exactly */
|
|
bb_perror_msg("cd: %s", newdir);
|
|
return EXIT_FAILURE;
|
|
}
|
|
set_cwd();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int builtin_exec(char **argv)
|
|
{
|
|
if (*++argv == NULL)
|
|
return EXIT_SUCCESS; /* bash does this */
|
|
{
|
|
#if !BB_MMU
|
|
nommu_save_t dummy;
|
|
#endif
|
|
/* TODO: if exec fails, bash does NOT exit! We do... */
|
|
pseudo_exec_argv(&dummy, argv, 0, NULL);
|
|
/* never returns */
|
|
}
|
|
}
|
|
|
|
static int builtin_exit(char **argv)
|
|
{
|
|
debug_printf_exec("%s()\n", __func__);
|
|
|
|
/* interactive bash:
|
|
* # trap "echo EEE" EXIT
|
|
* # exit
|
|
* exit
|
|
* There are stopped jobs.
|
|
* (if there are _stopped_ jobs, running ones don't count)
|
|
* # exit
|
|
* exit
|
|
# EEE (then bash exits)
|
|
*
|
|
* we can use G.exiting = -1 as indicator "last cmd was exit"
|
|
*/
|
|
|
|
/* note: EXIT trap is run by hush_exit */
|
|
if (*++argv == NULL)
|
|
hush_exit(G.last_exitcode);
|
|
/* mimic bash: exit 123abc == exit 255 + error msg */
|
|
xfunc_error_retval = 255;
|
|
/* bash: exit -2 == exit 254, no error msg */
|
|
hush_exit(xatoi(*argv) & 0xff);
|
|
}
|
|
|
|
static void print_escaped(const char *s)
|
|
{
|
|
do {
|
|
if (*s != '\'') {
|
|
const char *p;
|
|
|
|
p = strchrnul(s, '\'');
|
|
/* print 'xxxx', possibly just '' */
|
|
printf("'%.*s'", (int)(p - s), s);
|
|
if (*p == '\0')
|
|
break;
|
|
s = p;
|
|
}
|
|
/* s points to '; print "'''...'''" */
|
|
putchar('"');
|
|
do putchar('\''); while (*++s == '\'');
|
|
putchar('"');
|
|
} while (*s);
|
|
}
|
|
|
|
static int builtin_export(char **argv)
|
|
{
|
|
unsigned opt_unexport;
|
|
|
|
if (argv[1] == NULL) {
|
|
char **e = environ;
|
|
if (e) {
|
|
while (*e) {
|
|
#if 0
|
|
puts(*e++);
|
|
#else
|
|
/* ash emits: export VAR='VAL'
|
|
* bash: declare -x VAR="VAL"
|
|
* we follow ash example */
|
|
const char *s = *e++;
|
|
const char *p = strchr(s, '=');
|
|
|
|
if (!p) /* wtf? take next variable */
|
|
continue;
|
|
/* export var= */
|
|
printf("export %.*s", (int)(p - s) + 1, s);
|
|
print_escaped(p + 1);
|
|
putchar('\n');
|
|
#endif
|
|
}
|
|
/*fflush(stdout); - done after each builtin anyway */
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
#if ENABLE_HUSH_EXPORT_N
|
|
/* "!": do not abort on errors */
|
|
/* "+": stop at 1st non-option */
|
|
opt_unexport = getopt32(argv, "!+n");
|
|
if (opt_unexport == (unsigned)-1)
|
|
return EXIT_FAILURE;
|
|
argv += optind;
|
|
#else
|
|
opt_unexport = 0;
|
|
argv++;
|
|
#endif
|
|
|
|
do {
|
|
char *name = *argv;
|
|
|
|
/* So far we do not check that name is valid (TODO?) */
|
|
|
|
if (strchr(name, '=') == NULL) {
|
|
struct variable *var;
|
|
|
|
var = get_local_var(name);
|
|
if (opt_unexport) {
|
|
/* export -n NAME (without =VALUE) */
|
|
if (var) {
|
|
var->flg_export = 0;
|
|
debug_printf_env("%s: unsetenv '%s'\n", __func__, name);
|
|
unsetenv(name);
|
|
} /* else: export -n NOT_EXISTING_VAR: no-op */
|
|
continue;
|
|
}
|
|
/* export NAME (without =VALUE) */
|
|
if (var) {
|
|
var->flg_export = 1;
|
|
debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
|
|
putenv(var->varstr);
|
|
continue;
|
|
}
|
|
/* Exporting non-existing variable.
|
|
* bash does not put it in environment,
|
|
* but remembers that it is exported,
|
|
* and does put it in env when it is set later.
|
|
* We just set it to "" and export. */
|
|
name = xasprintf("%s=", name);
|
|
} else {
|
|
/* (Un)exporting NAME=VALUE */
|
|
name = xstrdup(name);
|
|
}
|
|
set_local_var(name,
|
|
/*export:*/ (opt_unexport ? -1 : 1),
|
|
/*readonly:*/ 0
|
|
);
|
|
} while (*++argv);
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int builtin_trap(char **argv)
|
|
{
|
|
int sig;
|
|
char *new_cmd;
|
|
|
|
if (!G.traps)
|
|
G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
|
|
|
|
argv++;
|
|
if (!*argv) {
|
|
int i;
|
|
/* No args: print all trapped */
|
|
for (i = 0; i < NSIG; ++i) {
|
|
if (G.traps[i]) {
|
|
printf("trap -- ");
|
|
print_escaped(G.traps[i]);
|
|
printf(" %s\n", get_signame(i));
|
|
}
|
|
}
|
|
/*fflush(stdout); - done after each builtin anyway */
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
new_cmd = NULL;
|
|
/* If first arg is a number: reset all specified signals */
|
|
sig = bb_strtou(*argv, NULL, 10);
|
|
if (errno == 0) {
|
|
int ret;
|
|
process_sig_list:
|
|
ret = EXIT_SUCCESS;
|
|
while (*argv) {
|
|
sig = get_signum(*argv++);
|
|
if (sig < 0 || sig >= NSIG) {
|
|
ret = EXIT_FAILURE;
|
|
/* Mimic bash message exactly */
|
|
bb_perror_msg("trap: %s: invalid signal specification", argv[-1]);
|
|
continue;
|
|
}
|
|
|
|
free(G.traps[sig]);
|
|
G.traps[sig] = xstrdup(new_cmd);
|
|
|
|
debug_printf("trap: setting SIG%s (%i) to '%s'",
|
|
get_signame(sig), sig, G.traps[sig]);
|
|
|
|
/* There is no signal for 0 (EXIT) */
|
|
if (sig == 0)
|
|
continue;
|
|
|
|
if (new_cmd) {
|
|
sigaddset(&G.blocked_set, sig);
|
|
} else {
|
|
/* There was a trap handler, we are removing it
|
|
* (if sig has non-DFL handling,
|
|
* we don't need to do anything) */
|
|
if (sig < 32 && (G.non_DFL_mask & (1 << sig)))
|
|
continue;
|
|
sigdelset(&G.blocked_set, sig);
|
|
}
|
|
}
|
|
sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
|
|
return ret;
|
|
}
|
|
|
|
if (!argv[1]) { /* no second arg */
|
|
bb_error_msg("trap: invalid arguments");
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
/* First arg is "-": reset all specified to default */
|
|
/* First arg is "--": skip it, the rest is "handler SIGs..." */
|
|
/* Everything else: set arg as signal handler
|
|
* (includes "" case, which ignores signal) */
|
|
if (argv[0][0] == '-') {
|
|
if (argv[0][1] == '\0') { /* "-" */
|
|
/* new_cmd remains NULL: "reset these sigs" */
|
|
goto reset_traps;
|
|
}
|
|
if (argv[0][1] == '-' && argv[0][2] == '\0') { /* "--" */
|
|
argv++;
|
|
}
|
|
/* else: "-something", no special meaning */
|
|
}
|
|
new_cmd = *argv;
|
|
reset_traps:
|
|
argv++;
|
|
goto process_sig_list;
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/type.html */
|
|
static int builtin_type(char **argv)
|
|
{
|
|
int ret = EXIT_SUCCESS;
|
|
|
|
while (*++argv) {
|
|
const char *type;
|
|
char *path = NULL;
|
|
|
|
if (0) {} /* make conditional compile easier below */
|
|
/*else if (find_alias(*argv))
|
|
type = "an alias";*/
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else if (find_function(*argv))
|
|
type = "a function";
|
|
#endif
|
|
else if (find_builtin(*argv))
|
|
type = "a shell builtin";
|
|
else if ((path = find_in_path(*argv)) != NULL)
|
|
type = path;
|
|
else {
|
|
bb_error_msg("type: %s: not found", *argv);
|
|
ret = EXIT_FAILURE;
|
|
continue;
|
|
}
|
|
|
|
printf("%s is %s\n", *argv, type);
|
|
free(path);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
/* built-in 'fg' and 'bg' handler */
|
|
static int builtin_fg_bg(char **argv)
|
|
{
|
|
int i, jobnum;
|
|
struct pipe *pi;
|
|
|
|
if (!G_interactive_fd)
|
|
return EXIT_FAILURE;
|
|
|
|
/* If they gave us no args, assume they want the last backgrounded task */
|
|
if (!argv[1]) {
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
if (pi->jobid == G.last_jobid) {
|
|
goto found;
|
|
}
|
|
}
|
|
bb_error_msg("%s: no current job", argv[0]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
|
|
bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
for (pi = G.job_list; pi; pi = pi->next) {
|
|
if (pi->jobid == jobnum) {
|
|
goto found;
|
|
}
|
|
}
|
|
bb_error_msg("%s: %d: no such job", argv[0], jobnum);
|
|
return EXIT_FAILURE;
|
|
found:
|
|
/* TODO: bash prints a string representation
|
|
* of job being foregrounded (like "sleep 1 | cat") */
|
|
if (argv[0][0] == 'f' && G_saved_tty_pgrp) {
|
|
/* Put the job into the foreground. */
|
|
tcsetpgrp(G_interactive_fd, pi->pgrp);
|
|
}
|
|
|
|
/* Restart the processes in the job */
|
|
debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
|
|
for (i = 0; i < pi->num_cmds; i++) {
|
|
debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
|
|
pi->cmds[i].is_stopped = 0;
|
|
}
|
|
pi->stopped_cmds = 0;
|
|
|
|
i = kill(- pi->pgrp, SIGCONT);
|
|
if (i < 0) {
|
|
if (errno == ESRCH) {
|
|
delete_finished_bg_job(pi);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
bb_perror_msg("kill (SIGCONT)");
|
|
}
|
|
|
|
if (argv[0][0] == 'f') {
|
|
remove_bg_job(pi);
|
|
return checkjobs_and_fg_shell(pi);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_HELP
|
|
static int builtin_help(char **argv UNUSED_PARAM)
|
|
{
|
|
const struct built_in_command *x;
|
|
|
|
printf("\n"
|
|
"Built-in commands:\n"
|
|
"------------------\n");
|
|
for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
|
|
printf("%s\t%s\n", x->cmd, x->descr);
|
|
}
|
|
printf("\n\n");
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_JOB
|
|
static int builtin_jobs(char **argv UNUSED_PARAM)
|
|
{
|
|
struct pipe *job;
|
|
const char *status_string;
|
|
|
|
for (job = G.job_list; job; job = job->next) {
|
|
if (job->alive_cmds == job->stopped_cmds)
|
|
status_string = "Stopped";
|
|
else
|
|
status_string = "Running";
|
|
|
|
printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
#if HUSH_DEBUG
|
|
static int builtin_memleak(char **argv UNUSED_PARAM)
|
|
{
|
|
void *p;
|
|
unsigned long l;
|
|
|
|
/* Crude attempt to find where "free memory" starts,
|
|
* sans fragmentation. */
|
|
p = malloc(240);
|
|
l = (unsigned long)p;
|
|
free(p);
|
|
p = malloc(3400);
|
|
if (l < (unsigned long)p) l = (unsigned long)p;
|
|
free(p);
|
|
|
|
if (!G.memleak_value)
|
|
G.memleak_value = l;
|
|
|
|
l -= G.memleak_value;
|
|
if ((long)l < 0)
|
|
l = 0;
|
|
l /= 1024;
|
|
if (l > 127)
|
|
l = 127;
|
|
|
|
/* Exitcode is "how many kilobytes we leaked since 1st call" */
|
|
return l;
|
|
}
|
|
#endif
|
|
|
|
static int builtin_pwd(char **argv UNUSED_PARAM)
|
|
{
|
|
puts(set_cwd());
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int builtin_read(char **argv)
|
|
{
|
|
char *string;
|
|
const char *name = "REPLY";
|
|
|
|
if (argv[1]) {
|
|
name = argv[1];
|
|
/* bash (3.2.33(1)) bug: "read 0abcd" will execute,
|
|
* and _after_ that_ it will complain */
|
|
if (!is_well_formed_var_name(name, '\0')) {
|
|
/* Mimic bash message */
|
|
bb_error_msg("read: '%s': not a valid identifier", name);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
//TODO: bash unbackslashes input, splits words and puts them in argv[i]
|
|
|
|
string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
|
|
return set_local_var(string, 0, 0);
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
|
|
* built-in 'set' handler
|
|
* SUSv3 says:
|
|
* set [-abCefhmnuvx] [-o option] [argument...]
|
|
* set [+abCefhmnuvx] [+o option] [argument...]
|
|
* set -- [argument...]
|
|
* set -o
|
|
* set +o
|
|
* Implementations shall support the options in both their hyphen and
|
|
* plus-sign forms. These options can also be specified as options to sh.
|
|
* Examples:
|
|
* Write out all variables and their values: set
|
|
* Set $1, $2, and $3 and set "$#" to 3: set c a b
|
|
* Turn on the -x and -v options: set -xv
|
|
* Unset all positional parameters: set --
|
|
* Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
|
|
* Set the positional parameters to the expansion of x, even if x expands
|
|
* with a leading '-' or '+': set -- $x
|
|
*
|
|
* So far, we only support "set -- [argument...]" and some of the short names.
|
|
*/
|
|
static int builtin_set(char **argv)
|
|
{
|
|
int n;
|
|
char **pp, **g_argv;
|
|
char *arg = *++argv;
|
|
|
|
if (arg == NULL) {
|
|
struct variable *e;
|
|
for (e = G.top_var; e; e = e->next)
|
|
puts(e->varstr);
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
do {
|
|
if (!strcmp(arg, "--")) {
|
|
++argv;
|
|
goto set_argv;
|
|
}
|
|
if (arg[0] != '+' && arg[0] != '-')
|
|
break;
|
|
for (n = 1; arg[n]; ++n)
|
|
if (set_mode(arg[0], arg[n]))
|
|
goto error;
|
|
} while ((arg = *++argv) != NULL);
|
|
/* Now argv[0] is 1st argument */
|
|
|
|
if (arg == NULL)
|
|
return EXIT_SUCCESS;
|
|
set_argv:
|
|
|
|
/* NB: G.global_argv[0] ($0) is never freed/changed */
|
|
g_argv = G.global_argv;
|
|
if (G.global_args_malloced) {
|
|
pp = g_argv;
|
|
while (*++pp)
|
|
free(*pp);
|
|
g_argv[1] = NULL;
|
|
} else {
|
|
G.global_args_malloced = 1;
|
|
pp = xzalloc(sizeof(pp[0]) * 2);
|
|
pp[0] = g_argv[0]; /* retain $0 */
|
|
g_argv = pp;
|
|
}
|
|
/* This realloc's G.global_argv */
|
|
G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
|
|
|
|
n = 1;
|
|
while (*++pp)
|
|
n++;
|
|
G.global_argc = n;
|
|
|
|
return EXIT_SUCCESS;
|
|
|
|
/* Nothing known, so abort */
|
|
error:
|
|
bb_error_msg("set: %s: invalid option", arg);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
static int builtin_shift(char **argv)
|
|
{
|
|
int n = 1;
|
|
if (argv[1]) {
|
|
n = atoi(argv[1]);
|
|
}
|
|
if (n >= 0 && n < G.global_argc) {
|
|
if (G.global_args_malloced) {
|
|
int m = 1;
|
|
while (m <= n)
|
|
free(G.global_argv[m++]);
|
|
}
|
|
G.global_argc -= n;
|
|
memmove(&G.global_argv[1], &G.global_argv[n+1],
|
|
G.global_argc * sizeof(G.global_argv[0]));
|
|
return EXIT_SUCCESS;
|
|
}
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
static int builtin_source(char **argv)
|
|
{
|
|
char *arg_path;
|
|
FILE *input;
|
|
save_arg_t sv;
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
smallint sv_flg;
|
|
#endif
|
|
|
|
if (*++argv == NULL)
|
|
return EXIT_FAILURE;
|
|
|
|
if (strchr(*argv, '/') == NULL && (arg_path = find_in_path(*argv)) != NULL) {
|
|
input = fopen_for_read(arg_path);
|
|
free(arg_path);
|
|
} else
|
|
input = fopen_or_warn(*argv, "r");
|
|
if (!input) {
|
|
/* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
|
|
return EXIT_FAILURE;
|
|
}
|
|
close_on_exec_on(fileno(input));
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
sv_flg = G.flag_return_in_progress;
|
|
/* "we are inside sourced file, ok to use return" */
|
|
G.flag_return_in_progress = -1;
|
|
#endif
|
|
save_and_replace_G_args(&sv, argv);
|
|
|
|
parse_and_run_file(input);
|
|
fclose(input);
|
|
|
|
restore_G_args(&sv, argv);
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
G.flag_return_in_progress = sv_flg;
|
|
#endif
|
|
|
|
return G.last_exitcode;
|
|
}
|
|
|
|
static int builtin_umask(char **argv)
|
|
{
|
|
int rc;
|
|
mode_t mask;
|
|
|
|
mask = umask(0);
|
|
if (argv[1]) {
|
|
mode_t old_mask = mask;
|
|
|
|
mask ^= 0777;
|
|
rc = bb_parse_mode(argv[1], &mask);
|
|
mask ^= 0777;
|
|
if (rc == 0) {
|
|
mask = old_mask;
|
|
/* bash messages:
|
|
* bash: umask: 'q': invalid symbolic mode operator
|
|
* bash: umask: 999: octal number out of range
|
|
*/
|
|
bb_error_msg("%s: '%s' invalid mode", argv[0], argv[1]);
|
|
}
|
|
} else {
|
|
rc = 1;
|
|
/* Mimic bash */
|
|
printf("%04o\n", (unsigned) mask);
|
|
/* fall through and restore mask which we set to 0 */
|
|
}
|
|
umask(mask);
|
|
|
|
return !rc; /* rc != 0 - success */
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
|
|
static int builtin_unset(char **argv)
|
|
{
|
|
int ret;
|
|
unsigned opts;
|
|
|
|
/* "!": do not abort on errors */
|
|
/* "+": stop at 1st non-option */
|
|
opts = getopt32(argv, "!+vf");
|
|
if (opts == (unsigned)-1)
|
|
return EXIT_FAILURE;
|
|
if (opts == 3) {
|
|
bb_error_msg("unset: -v and -f are exclusive");
|
|
return EXIT_FAILURE;
|
|
}
|
|
argv += optind;
|
|
|
|
ret = EXIT_SUCCESS;
|
|
while (*argv) {
|
|
if (!(opts & 2)) { /* not -f */
|
|
if (unset_local_var(*argv)) {
|
|
/* unset <nonexistent_var> doesn't fail.
|
|
* Error is when one tries to unset RO var.
|
|
* Message was printed by unset_local_var. */
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
}
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
else {
|
|
unset_func(*argv);
|
|
}
|
|
#endif
|
|
argv++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
|
|
static int builtin_wait(char **argv)
|
|
{
|
|
int ret = EXIT_SUCCESS;
|
|
int status, sig;
|
|
|
|
if (*++argv == NULL) {
|
|
/* Don't care about wait results */
|
|
/* Note 1: must wait until there are no more children */
|
|
/* Note 2: must be interruptible */
|
|
/* Examples:
|
|
* $ sleep 3 & sleep 6 & wait
|
|
* [1] 30934 sleep 3
|
|
* [2] 30935 sleep 6
|
|
* [1] Done sleep 3
|
|
* [2] Done sleep 6
|
|
* $ sleep 3 & sleep 6 & wait
|
|
* [1] 30936 sleep 3
|
|
* [2] 30937 sleep 6
|
|
* [1] Done sleep 3
|
|
* ^C <-- after ~4 sec from keyboard
|
|
* $
|
|
*/
|
|
sigaddset(&G.blocked_set, SIGCHLD);
|
|
sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
|
|
while (1) {
|
|
checkjobs(NULL);
|
|
if (errno == ECHILD)
|
|
break;
|
|
/* Wait for SIGCHLD or any other signal of interest */
|
|
/* sigtimedwait with infinite timeout: */
|
|
sig = sigwaitinfo(&G.blocked_set, NULL);
|
|
if (sig > 0) {
|
|
sig = check_and_run_traps(sig);
|
|
if (sig && sig != SIGCHLD) { /* see note 2 */
|
|
ret = 128 + sig;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
sigdelset(&G.blocked_set, SIGCHLD);
|
|
sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
|
|
return ret;
|
|
}
|
|
|
|
/* This is probably buggy wrt interruptible-ness */
|
|
while (*argv) {
|
|
pid_t pid = bb_strtou(*argv, NULL, 10);
|
|
if (errno) {
|
|
/* mimic bash message */
|
|
bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
|
|
return EXIT_FAILURE;
|
|
}
|
|
if (waitpid(pid, &status, 0) == pid) {
|
|
if (WIFSIGNALED(status))
|
|
ret = 128 + WTERMSIG(status);
|
|
else if (WIFEXITED(status))
|
|
ret = WEXITSTATUS(status);
|
|
else /* wtf? */
|
|
ret = EXIT_FAILURE;
|
|
} else {
|
|
bb_perror_msg("wait %s", *argv);
|
|
ret = 127;
|
|
}
|
|
argv++;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_FUNCTIONS
|
|
static unsigned parse_numeric_argv1(char **argv, unsigned def, unsigned def_min)
|
|
{
|
|
if (argv[1]) {
|
|
def = bb_strtou(argv[1], NULL, 10);
|
|
if (errno || def < def_min || argv[2]) {
|
|
bb_error_msg("%s: bad arguments", argv[0]);
|
|
def = UINT_MAX;
|
|
}
|
|
}
|
|
return def;
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_LOOPS
|
|
static int builtin_break(char **argv)
|
|
{
|
|
unsigned depth;
|
|
if (G.depth_of_loop == 0) {
|
|
bb_error_msg("%s: only meaningful in a loop", argv[0]);
|
|
return EXIT_SUCCESS; /* bash compat */
|
|
}
|
|
G.flag_break_continue++; /* BC_BREAK = 1 */
|
|
|
|
G.depth_break_continue = depth = parse_numeric_argv1(argv, 1, 1);
|
|
if (depth == UINT_MAX)
|
|
G.flag_break_continue = BC_BREAK;
|
|
if (G.depth_of_loop < depth)
|
|
G.depth_break_continue = G.depth_of_loop;
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
static int builtin_continue(char **argv)
|
|
{
|
|
G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
|
|
return builtin_break(argv);
|
|
}
|
|
#endif
|
|
|
|
#if ENABLE_HUSH_FUNCTIONS
|
|
static int builtin_return(char **argv)
|
|
{
|
|
int rc;
|
|
|
|
if (G.flag_return_in_progress != -1) {
|
|
bb_error_msg("%s: not in a function or sourced script", argv[0]);
|
|
return EXIT_FAILURE; /* bash compat */
|
|
}
|
|
|
|
G.flag_return_in_progress = 1;
|
|
|
|
/* bash:
|
|
* out of range: wraps around at 256, does not error out
|
|
* non-numeric param:
|
|
* f() { false; return qwe; }; f; echo $?
|
|
* bash: return: qwe: numeric argument required <== we do this
|
|
* 255 <== we also do this
|
|
*/
|
|
rc = parse_numeric_argv1(argv, G.last_exitcode, 0);
|
|
return rc;
|
|
}
|
|
#endif
|