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busybox/miscutils/devfsd.c

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New applet, devfsd, by Matteo Croce and Tito
2003-10-09 17:16:23 +05:30
/*
devfsd implementation for busybox
Copyright (C) 2003 by Tito Ragusa <farmatito@tiscali.it>
Busybox version is based on some previous work and ideas
Copyright (C) [2003] by [Matteo Croce] <3297627799@wind.it>
devfsd.c
Main file for devfsd (devfs daemon for Linux).
Copyright (C) 1998-2002 Richard Gooch
devfsd.h
Header file for devfsd (devfs daemon for Linux).
Copyright (C) 1998-2000 Richard Gooch
compat_name.c
Compatibility name file for devfsd (build compatibility names).
Copyright (C) 1998-2002 Richard Gooch
expression.c
This code provides Borne Shell-like expression expansion.
Copyright (C) 1997-1999 Richard Gooch
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Richard Gooch may be reached by email at rgooch@atnf.csiro.au
The postal address is:
Richard Gooch, c/o ATNF, P. O. Box 76, Epping, N.S.W., 2121, Australia.
*/
#include "libbb.h"
#include "busybox.h"
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <dirent.h>
#include <fcntl.h>
#include <linux/major.h>
#include <linux/devfs_fs.h>
#include <linux/kdev_t.h>
#include <syslog.h>
#include <signal.h>
#include <regex.h>
#include <errno.h>
#ifndef IDE6_MAJOR /* In case we're building with an ancient kernel */
# define IDE6_MAJOR 88
# define IDE7_MAJOR 89
# define IDE8_MAJOR 90
# define IDE9_MAJOR 91
#endif
/* These are now in Config.in */
/* define this if you want to have more output on stderr and syslog at the same time */
/*#define CONFIG_DEVFSD_VERBOSE*/
/* define this if you want to have the function names in output */
/*#define CONFIG_DEVFSD_DEBUG*/
#define BUFFER_SIZE 16384
#define DEVFSD_VERSION "1.3.25"
#define CONFIG_FILE "/etc/devfsd.conf"
#define MAX_ARGS (6 + 1)
#define MAX_SUBEXPR 10
#define STRING_LENGTH 255
/* for get_uid_gid() */
#define UID 0
#define GID 1
/* for msg_logger(), do_ioctl(),
fork_and_execute() and xopendir(). */
# define DIE 1
# define NO_DIE 0
/* Update only after changing code to reflect new protocol */
#define DEVFSD_PROTOCOL_REVISION_DAEMON 5
/* Compile-time check */
#if DEVFSD_PROTOCOL_REVISION_KERNEL != DEVFSD_PROTOCOL_REVISION_DAEMON
#error protocol version mismatch. Update your kernel headers
#endif
#define AC_PERMISSIONS 0
#define AC_MODLOAD 1 /* not supported by busybox */
#define AC_EXECUTE 2
#define AC_MFUNCTION 3 /* not supported by busybox */
#define AC_CFUNCTION 4 /* not supported by busybox */
#define AC_COPY 5
#define AC_IGNORE 6
#define AC_MKOLDCOMPAT 7
#define AC_MKNEWCOMPAT 8
#define AC_RMOLDCOMPAT 9
#define AC_RMNEWCOMPAT 10
#define AC_RESTORE 11
struct permissions_type
{
mode_t mode;
uid_t uid;
gid_t gid;
};
struct execute_type
{
char *argv[MAX_ARGS + 1]; /* argv[0] must always be the programme */
};
struct copy_type
{
const char *source;
const char *destination;
};
struct action_type
{
unsigned int what;
unsigned int when;
};
struct config_entry_struct
{
struct action_type action;
regex_t preg;
union
{
struct permissions_type permissions;
struct execute_type execute;
struct copy_type copy;
}
u;
struct config_entry_struct *next;
};
struct get_variable_info
{
const struct devfsd_notify_struct *info;
const char *devname;
char devpath[STRING_LENGTH];
};
static int st_expr_expand(char *, unsigned, const char *, const char *(*) (const char *, void *), void *);
static const char *get_old_name(const char *, unsigned, char *, unsigned, unsigned);
static int mksymlink (const char *oldpath, const char *newpath);
static void read_config_file (const char *path, int optional, unsigned long *event_mask);
static void process_config_line (const char *, unsigned long *);
static int do_servicing (int, unsigned long);
static void service_name (const struct devfsd_notify_struct *);
static void action_permissions (const struct devfsd_notify_struct *, const struct config_entry_struct *);
static void action_execute (const struct devfsd_notify_struct *, const struct config_entry_struct *,
const regmatch_t *, unsigned);
static void action_copy (const struct devfsd_notify_struct *, const struct config_entry_struct *,
const regmatch_t *, unsigned);
static void action_compat (const struct devfsd_notify_struct *, unsigned);
static void free_config (void);
static void do_restore (const char *, int);
static int copy_inode (const char *, const struct stat *, mode_t, const char *, const struct stat *);
static mode_t get_mode (const char *);
static void signal_handler (int);
static const char *get_variable (const char *, void *);
static void do_scan_and_service (const char *);
static int make_dir_tree (const char *);
static int expand_expression(char *, unsigned, const char *, const char *(*)(const char *, void *), void *,
const char *, const regmatch_t *, unsigned );
static void expand_regexp (char *, size_t, const char *, const char *, const regmatch_t *, unsigned );
static const char *expand_variable( char *, unsigned, unsigned *, const char *,
const char *(*) (const char *, void *), void * );
static const char *get_variable_v2(const char *, const char *(*) (const char *, void *), void *);
static char get_old_ide_name (unsigned , unsigned);
static char *write_old_sd_name (char *, unsigned, unsigned, char *);
/* busybox functions */
static void msg_logger(int die, int pri, const char * fmt, ... );
static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag);
static void fork_and_execute(int die, char *arg0, char **arg );
DIR * xopendir(int die, const char * dir_name);
static int get_uid_gid ( int, const char *);
static void safe_memcpy( char * dest, const char * src, int len);
/* Structs and vars */
static struct config_entry_struct *first_config = NULL;
static struct config_entry_struct *last_config = NULL;
static const char *mount_point = NULL;
static volatile int caught_signal = FALSE;
static volatile int caught_sighup = FALSE;
static struct initial_symlink_struct
{
char *dest;
char *name;
} initial_symlinks[] =
{
{"/proc/self/fd", "fd"},
{"fd/0", "stdin"},
{"fd/1", "stdout"},
{"fd/2", "stderr"},
{NULL, NULL},
};
static struct event_type
{
unsigned int type; /* The DEVFSD_NOTIFY_* value */
const char *config_name; /* The name used in the config file */
} event_types[] =
{
{DEVFSD_NOTIFY_REGISTERED, "REGISTER"},
{DEVFSD_NOTIFY_UNREGISTERED, "UNREGISTER"},
{DEVFSD_NOTIFY_ASYNC_OPEN, "ASYNC_OPEN"},
{DEVFSD_NOTIFY_CLOSE, "CLOSE"},
{DEVFSD_NOTIFY_LOOKUP, "LOOKUP"},
{DEVFSD_NOTIFY_CHANGE, "CHANGE"},
{DEVFSD_NOTIFY_CREATE, "CREATE"},
{DEVFSD_NOTIFY_DELETE, "DELETE"},
{0xffffffff, NULL}
};
/* busybox functions and messages */
extern void xregcomp(regex_t * preg, const char *regex, int cflags);
const char * const bb_msg_bad_config = "bad %s config file: %s\n";
const char * const bb_msg_proto_rev = "protocol revision";
#ifdef CONFIG_DEVFSD_VERBOSE
const char * const bb_msg_small_buffer = "buffer too small\n";
const char * const bb_msg_variable_not_found= "variable: %s not found\n";
#endif
static void msg_logger(int die, int pri, const char * fmt, ... )
{
va_list ap;
va_start(ap, fmt);
if (access ("/dev/log", F_OK) == 0)
{
openlog(bb_applet_name, 0, LOG_DAEMON);
vsyslog( pri , fmt , ap);
closelog();
}
#ifndef CONFIG_DEVFSD_VERBOSE
else
#endif
bb_verror_msg(fmt, ap);
va_end(ap);
if(die==DIE)
exit(EXIT_FAILURE);
}
static void do_ioctl(int die, int fd, int request, unsigned long event_mask_flag)
{
if (ioctl (fd, request, event_mask_flag) != 0)
msg_logger(die, LOG_ERR, "ioctl() failed: %m\n");
}
static void fork_and_execute(int die, char *arg0, char **arg )
{
switch ( fork () )
{
case 0:
/* Child */
break;
case -1:
/* Parent: Error : die or return */
msg_logger(die, LOG_ERR,(char *) bb_msg_memory_exhausted);
return;
default:
/* Parent : ok : return or exit */
if(arg0 != NULL)
{
wait (NULL);
return;
}
exit (EXIT_SUCCESS);
}
/* Child : if arg0 != NULL do execvp */
if(arg0 != NULL )
{
execvp (arg0, arg);
msg_logger(DIE, LOG_ERR, "execvp() failed: %s: %m\n", arg0);
}
}
DIR * xopendir(int die, const char * dir_name)
{
DIR *dp;
if ( ( dp = opendir (dir_name) ) == NULL )
msg_logger( die, LOG_ERR, "opendir() failed: %s: %m\n", dir_name);
/* if die == DIE not reached else return NULL */
return dp;
}
static void safe_memcpy( char *dest, const char *src, int len)
{
memcpy (dest , src , len );
dest[len] = '\0';
}
/* Public functions follow */
int devfsd_main (int argc, char **argv)
{
int print_version = FALSE;
int do_daemon = TRUE;
int no_polling = FALSE;
int fd, proto_rev, count;
unsigned long event_mask = 0;
struct sigaction new_action;
struct initial_symlink_struct *curr;
if (argc < 2)
bb_show_usage();
for (count = 2; count < argc; ++count)
{
if (strcmp (argv[count], "-v") == 0)
print_version = TRUE;
else if (strcmp (argv[count], "-fg") == 0)
do_daemon = FALSE;
else if (strcmp (argv[count], "-np") == 0)
no_polling = TRUE;
else
bb_show_usage();
}
mount_point = argv[1];
if (chdir (mount_point) != 0)
bb_error_msg_and_die( " %s: %m", mount_point);
fd = bb_xopen (".devfsd", O_RDONLY);
if (fcntl (fd, F_SETFD, FD_CLOEXEC) != 0)
bb_error_msg( "FD_CLOEXEC");
do_ioctl(DIE, fd, DEVFSDIOC_GET_PROTO_REV,(int )&proto_rev);
/*setup initial entries */
for (curr = initial_symlinks; curr->dest != NULL; ++curr)
symlink (curr->dest, curr->name);
/* NB: The check for CONFIG_FILE is done in read_config_file() */
if ( print_version || (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev) )
{
bb_printf( "%s v%s\nDaemon %s:\t%d\nKernel-side %s:\t%d\n",
bb_applet_name,DEVFSD_VERSION,bb_msg_proto_rev,
DEVFSD_PROTOCOL_REVISION_DAEMON,bb_msg_proto_rev, proto_rev);
if (DEVFSD_PROTOCOL_REVISION_DAEMON != proto_rev)
bb_error_msg_and_die( "%s mismatch!",bb_msg_proto_rev);
exit(EXIT_SUCCESS); /* -v */
}
/* Tell kernel we are special (i.e. we get to see hidden entries) */
do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, 0);
sigemptyset (&new_action.sa_mask);
new_action.sa_flags = 0;
/* Set up SIGHUP and SIGUSR1 handlers */
new_action.sa_handler = signal_handler;
if (sigaction (SIGHUP, &new_action, NULL) != 0 || sigaction (SIGUSR1, &new_action, NULL) != 0 )
bb_error_msg_and_die( "sigaction()");
bb_printf("%s v%s started for %s\n",bb_applet_name, DEVFSD_VERSION, mount_point);
/* Set umask so that mknod(2), open(2) and mkdir(2) have complete control over permissions */
umask (0);
read_config_file (CONFIG_FILE, FALSE, &event_mask);
/* Do the scan before forking, so that boot scripts see the finished product */
do_scan_and_service (mount_point);
if (no_polling)
exit (0);
if (do_daemon)
{
/* Release so that the child can grab it */
do_ioctl(DIE, fd, DEVFSDIOC_RELEASE_EVENT_QUEUE, 0);
fork_and_execute(DIE, NULL, NULL);
setsid (); /* Prevent hangups and become pgrp leader */
}
else
setpgid (0, 0); /* Become process group leader */
while (TRUE)
{
int do_scan = do_servicing (fd, event_mask);
free_config ();
read_config_file (CONFIG_FILE, FALSE, &event_mask);
if (do_scan)
do_scan_and_service (mount_point);
}
} /* End Function main */
/* Private functions follow */
static void read_config_file (const char *path, int optional, unsigned long *event_mask)
/* [SUMMARY] Read a configuration database.
<path> The path to read the database from. If this is a directory, all
entries in that directory will be read (except hidden entries).
<optional> If TRUE, the routine will silently ignore a missing config file.
<event_mask> The event mask is written here. This is not initialised.
[RETURNS] Nothing.
*/
{
struct stat statbuf;
FILE *fp;
char buf[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "read_config_file()\n");
#endif
if (stat (path, &statbuf) != 0 || statbuf.st_size == 0 )
msg_logger((optional == 0 )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path);
if ( S_ISDIR (statbuf.st_mode) )
{
DIR *dp;
struct dirent *de;
dp = xopendir(DIE, path);
while ( ( de = readdir (dp) ) != NULL )
{
char fname[STRING_LENGTH];
if (de->d_name[0] == '.')
continue;
snprintf (fname, STRING_LENGTH, "%s/%s", path, de->d_name);
read_config_file (fname, optional, event_mask);
}
closedir (dp);
return;
}
if ( ( fp = fopen (path, "r") ) != NULL )
{
while (fgets (buf, STRING_LENGTH, fp) != NULL)
{
char *line;
buf[strlen (buf) - 1] = '\0';
/* Skip whitespace */
for (line = buf; isspace (*line); ++line)
/*VOID*/;
if (line[0] == '\0' || line[0] == '#' )
continue;
process_config_line (line, event_mask);
}
fclose (fp);
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, "read config file: %s\n", path);
#endif
return;
}
msg_logger(( (optional == 0) && (errno == ENOENT) )? DIE : NO_DIE, LOG_ERR, " %s: %m\n", path);
} /* End Function read_config_file */
static void process_config_line (const char *line, unsigned long *event_mask)
/* [SUMMARY] Process a line from a configuration file.
<line> The configuration line.
<event_mask> The event mask is written here. This is not initialised.
[RETURNS] Nothing.
*/
{
int num_args, count;
struct config_entry_struct *new;
char p[MAX_ARGS][STRING_LENGTH];
char when[STRING_LENGTH], what[STRING_LENGTH];
char name[STRING_LENGTH];
char * msg="";
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "process_config_line()\n");
#endif
for (count = 0; count < MAX_ARGS; ++count) p[count][0] = '\0';
num_args = sscanf (line, "%s %s %s %s %s %s %s %s %s %s",
when, name, what,
p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
if (strcasecmp (when, "CLEAR_CONFIG") == 0)
{
free_config ();
*event_mask = 0;
return;
}
if (num_args < 2)
goto process_config_line_err;
if ( (strcasecmp (when, "INCLUDE") == 0) ||
(strcasecmp (when, "OPTIONAL_INCLUDE") == 0) )
{
st_expr_expand (name, STRING_LENGTH, name, get_variable, NULL );
read_config_file (name, (toupper (when[0]) == 'I') ? FALSE : TRUE, event_mask);
return;
}
if (strcasecmp (when, "RESTORE") == 0)
{
do_restore ( name, strlen (name) );
return;
}
if (num_args < 3)
goto process_config_line_err;
new = xmalloc (sizeof *new);
memset (new, 0, sizeof *new);
for (count = 0; event_types[count].config_name != NULL; ++count)
{
if (strcasecmp (when, event_types[count].config_name) != 0)
continue;
new->action.when = event_types[count].type;
break;
}
if (event_types[count].config_name == NULL)
{
msg="WHEN in";
goto process_config_line_err;
}
if (strcasecmp (what, "PERMISSIONS") == 0)
{
char *ptr;
new->action.what = AC_PERMISSIONS;
/* Get user and group */
if ( ( ptr = strchr (p[0], '.') ) == NULL )
{
msg="UID.GID";
goto process_config_line_err; /*"missing '.' in UID.GID */
}
*ptr++ = '\0';
new->u.permissions.uid = get_uid_gid (UID, p[0]);
new->u.permissions.gid = get_uid_gid (GID, ptr);
/* Get mode */
new->u.permissions.mode = get_mode (p[1]);
}
else if (strcasecmp (what, "EXECUTE") == 0)
{
new->action.what = AC_EXECUTE;
num_args -= 3;
for (count = 0; count < num_args; ++count)
new->u.execute.argv[count] = bb_xstrdup (p[count]);
new->u.execute.argv[num_args] = NULL;
}
else if (strcasecmp (what, "COPY") == 0)
{
new->action.what = AC_COPY;
num_args -= 3;
if (num_args != 2)
goto process_config_line_err; /* missing path and function in line */
new->u.copy.source = bb_xstrdup (p[0]);
new->u.copy.destination = bb_xstrdup (p[1]);
}
else if (strcasecmp (what, "IGNORE") == 0)
new->action.what = AC_IGNORE;
else if (strcasecmp (what, "MKOLDCOMPAT") == 0)
new->action.what = AC_MKOLDCOMPAT;
else if (strcasecmp (what, "MKNEWCOMPAT") == 0)
new->action.what = AC_MKNEWCOMPAT;
else if (strcasecmp (what, "RMOLDCOMPAT") == 0)
new->action.what = AC_RMOLDCOMPAT;
else if (strcasecmp (what, "RMNEWCOMPAT") == 0)
new->action.what = AC_RMNEWCOMPAT;
else
{
msg ="WHAT in";
goto process_config_line_err;
}
xregcomp( &new->preg, name, REG_EXTENDED);
*event_mask |= 1 << new->action.when;
new->next = NULL;
if (first_config == NULL)
first_config = new;
else
last_config->next = new;
last_config = new;
return;
process_config_line_err:
msg_logger( DIE, LOG_ERR, bb_msg_bad_config, msg , line);
} /* End Function process_config_line */
static int do_servicing (int fd, unsigned long event_mask)
/* [SUMMARY] Service devfs changes until a signal is received.
<fd> The open control file.
<event_mask> The event mask.
[RETURNS] TRUE if SIGHUP was caught, else FALSE.
*/
{
ssize_t bytes;
struct devfsd_notify_struct info;
unsigned long tmp_event_mask;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "do_servicing()\n");
#endif
/* Tell devfs what events we care about */
tmp_event_mask = event_mask;
/* May need to trap inode creates to watch for syslogd(8) starting */
/*if (!syslog_is_open && !no_syslog)
{
tmp_event_mask |= 1 << DEVFSD_NOTIFY_CREATE; *//*FIXME I'm not sure if this line is needed. TITO */
/*}*/
do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, tmp_event_mask);
while (!caught_signal)
{
errno = 0;
bytes = read (fd, (char *) &info, sizeof info);
if (caught_signal)
break; /* Must test for this first */
if (errno == EINTR)
continue; /* Yes, the order is important */
if (bytes < 1)
break;
/* Special trap for "/dev/log" creation */
/* Open syslog, now that "/dev/log" exists */
/*if (!syslog_is_open && !no_syslog &&
(info.type == DEVFSD_NOTIFY_CREATE) &&(strcmp (info.devname, "log") == 0) )
{
do_open_syslog ();
do_ioctl(DIE, fd, DEVFSDIOC_SET_EVENT_MASK, event_mask);*/ /*FIXME I'm not sure if this line is needed. TITO */
/*}*/
service_name (&info);
}
if (caught_signal)
{
int c_sighup = caught_sighup;
caught_signal = FALSE;
caught_sighup = FALSE;
return (c_sighup);
}
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_ERR, "read error on control file: %m\n");
#endif
/* This is to shut up a compiler warning */
exit(1);
} /* End Function do_servicing */
static void service_name (const struct devfsd_notify_struct *info)
/* [SUMMARY] Service a single devfs change.
<info> The devfs change.
[RETURNS] Nothing.
*/
{
unsigned int n;
regmatch_t mbuf[MAX_SUBEXPR];
struct config_entry_struct *entry;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "service_name()\n");
#endif
#ifdef CONFIG_DEVFSD_VERBOSE
if (info->overrun_count > 0)
msg_logger( NO_DIE, LOG_ERR, "lost %u events\n", info->overrun_count);
#endif
/* Discard lookups on "/dev/log" and "/dev/initctl" */
if (info->type == DEVFSD_NOTIFY_LOOKUP &&
(( (strcmp (info->devname, "log") == 0) ||
(strcmp (info->devname, "initctl") == 0))))
return;
for (entry = first_config; entry != NULL; entry = entry->next)
{
/* First check if action matches the type, then check if name matches */
if (info->type != entry->action.when || regexec (&entry->preg, info->devname, MAX_SUBEXPR, mbuf, 0) != 0 )
continue;
for (n = 0; (n < MAX_SUBEXPR) && (mbuf[n].rm_so != -1); ++n)
/* VOID */;
switch (entry->action.what)
{
case AC_PERMISSIONS:
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "AC_PERMISSIONS\n");
#endif
action_permissions (info, entry);
break;
case AC_EXECUTE:
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "AC_EXECUTE\n");
#endif
action_execute (info, entry, mbuf, n);
break;
case AC_COPY:
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "AC_COPY\n");
#endif
action_copy (info, entry, mbuf, n);
break;
case AC_IGNORE:
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "AC_IGNORE\n");
#endif
return;
/*break;*/
case AC_MKOLDCOMPAT:
case AC_MKNEWCOMPAT:
case AC_RMOLDCOMPAT:
case AC_RMNEWCOMPAT:
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "AC_COMPAT\n");
#endif
action_compat (info, entry->action.what);
break;
default:
msg_logger( DIE, LOG_ERR, "Unknown action\n");
/*break;*/
}
}
} /* End Function service_name */
static void action_permissions (const struct devfsd_notify_struct *info,
const struct config_entry_struct *entry)
/* [SUMMARY] Update permissions for a device entry.
<info> The devfs change.
<entry> The config file entry.
[RETURNS] Nothing.
*/
{
struct stat statbuf;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "action_permission()\n");
#endif
if ( stat (info->devname, &statbuf) != 0 ||
chmod (info->devname,(statbuf.st_mode & S_IFMT) | (entry->u.permissions.mode & ~S_IFMT)) != 0 ||
chown (info->devname, entry->u.permissions.uid, entry->u.permissions.gid) != 0)
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_ERR, "chmod() or chown() error for: %s: %m\n",info->devname);
#endif
return;
}
} /* End Function action_permissions */
static void action_execute (const struct devfsd_notify_struct *info,
const struct config_entry_struct *entry,
const regmatch_t *regexpr, unsigned int numexpr)
/* [SUMMARY] Execute a programme.
<info> The devfs change.
<entry> The config file entry.
<regexpr> The number of subexpression (start, end) offsets within the
device name.
<numexpr> The number of elements within <<regexpr>>.
[RETURNS] Nothing.
*/
{
unsigned int count;
struct get_variable_info gv_info;
char *argv[MAX_ARGS + 1];
char largv[MAX_ARGS + 1][STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "action_execute()\n");
#endif
gv_info.info = info;
gv_info.devname = info->devname;
snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
for (count = 0; entry->u.execute.argv[count] != NULL; ++count)
{
expand_expression (largv[count], STRING_LENGTH,
entry->u.execute.argv[count],
get_variable, &gv_info,
gv_info.devname, regexpr, numexpr );
argv[count] = largv[count];
}
argv[count] = NULL;
#ifdef CONFIG_DEVFSD_DEBUG
int i;
char buff[1024];
buff[0]='\0';
for(i=0;argv[i]!=NULL;i++) /* argv[i] < MAX_ARGS + 1 */
{
strcat(buff," ");
if( (strlen(buff)+ 1 + strlen(argv[i])) >= 1024)
break;
strcat(buff,argv[i]);
}
strcat(buff,"\n");
msg_logger( NO_DIE, LOG_INFO, "action_execute(): %s",buff);
#endif
fork_and_execute(NO_DIE, argv[0], argv);
} /* End Function action_execute */
static void action_copy (const struct devfsd_notify_struct *info,
const struct config_entry_struct *entry,
const regmatch_t *regexpr, unsigned int numexpr)
/* [SUMMARY] Copy permissions.
<info> The devfs change.
<entry> The config file entry.
<regexpr> This list of subexpression (start, end) offsets within the
device name.
<numexpr> The number of elements in <<regexpr>>.
[RETURNS] Nothing.
*/
{
mode_t new_mode;
struct get_variable_info gv_info;
struct stat source_stat, dest_stat;
char source[STRING_LENGTH], destination[STRING_LENGTH];
dest_stat.st_mode = 0;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "action_copy()\n");
#endif
if ( (info->type == DEVFSD_NOTIFY_CHANGE) && S_ISLNK (info->mode) )
return;
gv_info.info = info;
gv_info.devname = info->devname;
snprintf (gv_info.devpath, sizeof (gv_info.devpath), "%s/%s", mount_point, info->devname);
expand_expression (source, STRING_LENGTH, entry->u.copy.source,
get_variable, &gv_info, gv_info.devname,
regexpr, numexpr);
expand_expression (destination, STRING_LENGTH, entry->u.copy.destination,
get_variable, &gv_info, gv_info.devname,
regexpr, numexpr);
if ( !make_dir_tree (destination) || lstat (source, &source_stat) != 0)
goto action_copy_error;
lstat (destination, &dest_stat);
new_mode = source_stat.st_mode & ~S_ISVTX;
if (info->type == DEVFSD_NOTIFY_CREATE)
new_mode |= S_ISVTX;
else if ( (info->type == DEVFSD_NOTIFY_CHANGE) && (dest_stat.st_mode & S_ISVTX) )
new_mode |= S_ISVTX;
#ifdef CONFIG_DEVFSD_VERBOSE
if ( !copy_inode (destination, &dest_stat, new_mode, source, &source_stat) )
action_copy_error:
msg_logger( NO_DIE, LOG_ERR, "error copying: %s to %s: %m\n", source, destination);
#else
copy_inode (destination, &dest_stat, new_mode, source,&source_stat);
action_copy_error:
return;
#endif
} /* End Function action_copy */
static void action_compat (const struct devfsd_notify_struct *info,
unsigned int action)
/* [SUMMARY] Process a compatibility request.
<info> The devfs change.
<action> The action to take.
[RETURNS] Nothing.
*/
{
const char *compat_name = NULL;
const char *dest_name = info->devname;
char *ptr;
char compat_buf[STRING_LENGTH], dest_buf[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "action_compat()\n");
#endif
/* First construct compatibility name */
switch (action)
{
case AC_MKOLDCOMPAT:
case AC_RMOLDCOMPAT:
compat_name = get_old_name (info->devname, info->namelen, compat_buf, info->major, info->minor);
break;
case AC_MKNEWCOMPAT:
case AC_RMNEWCOMPAT:
if (strncmp (info->devname, "scsi/", 5) == 0)
{
int mode, host, bus, target, lun;
sscanf (info->devname + 5, "host%d/bus%d/target%d/lun%d/",
&host, &bus, &target, &lun);
compat_name = compat_buf;
snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname);
dest_name = dest_buf;
if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2)== 0)
{
char rewind_ = info->devname[info->namelen - 1];
if (rewind_ != 'n')
rewind_ = '\0';
switch (ptr[2])
{
default:
mode = 0;
break;
case 'l':
mode = 1;
break;
case 'm':
mode = 2;
break;
case 'a':
mode = 3;
break;
}
sprintf (compat_buf, "st/c%db%dt%du%dm%d%c", host, bus, target, lun, mode, rewind_);
}
else if (strcmp (info->devname + info->namelen - 7,"generic") == 0)
sprintf (compat_buf, "sg/c%db%dt%du%d",
host, bus, target, lun);
else if (strcmp (info->devname + info->namelen - 2, "cd") == 0)
sprintf (compat_buf, "sr/c%db%dt%du%d",
host, bus, target, lun);
else if (strcmp (info->devname + info->namelen - 4, "disc") == 0)
sprintf (compat_buf, "sd/c%db%dt%du%d",
host, bus, target, lun);
else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0)
sprintf ( compat_buf, "sd/c%db%dt%du%dp%d",
host, bus, target, lun, atoi (ptr + 4) );
else compat_name = NULL;
}
else if (strncmp (info->devname, "ide/host", 8) == 0)
{
int host, bus, target, lun;
sscanf (info->devname + 4, "host%d/bus%d/target%d/lun%d/",
&host, &bus, &target, &lun);
compat_name = compat_buf;
snprintf (dest_buf, sizeof (dest_buf), "../%s", info->devname + 4);
dest_name = dest_buf;
if (strcmp (info->devname + info->namelen - 4, "disc") == 0)
sprintf (compat_buf, "ide/hd/c%db%dt%du%d",
host, bus, target, lun);
else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "part", 4) == 0)
sprintf ( compat_buf, "ide/hd/c%db%dt%du%dp%d",
host, bus, target, lun, atoi (ptr + 4) );
else if (strcmp (info->devname + info->namelen - 2, "cd") == 0)
sprintf (compat_buf, "ide/cd/c%db%dt%du%d",
host, bus, target,lun);
else if (strncmp (ptr = (strrchr (info->devname, '/') + 1), "mt", 2) == 0)
snprintf (compat_buf, sizeof (compat_buf), "ide/mt/c%db%dt%du%d%s",
host, bus, target, lun, ptr + 2);
else compat_name = NULL;
}
break;
}
if (compat_name == NULL)
return;
/* Now decide what to do with it */
switch (action)
{
case AC_MKOLDCOMPAT:
case AC_MKNEWCOMPAT:
mksymlink (dest_name, compat_name);
break;
case AC_RMOLDCOMPAT:
case AC_RMNEWCOMPAT:
#ifdef CONFIG_DEVFSD_VERBOSE
if (unlink (compat_name) != 0)
msg_logger( NO_DIE, LOG_ERR, "unlink(): %s: %m\n", compat_name);
#else
unlink (compat_name);
#endif
break;
}
} /* End Function action_compat */
static void do_restore (const char *dir_name, int rootlen)
/* [SUMMARY] Restore state from a directory.
<dir_name> The directory containing the backing store.
<rootlen> The length of the root of the state directory hierarchy.
[RETURNS] Nothing.
*/
{
DIR *dp;
struct dirent *de;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "do_restore()\n");
#endif
if( (dp = xopendir(NO_DIE, dir_name))== NULL)
return;
while ( (de = readdir (dp) ) != NULL )
{
char spath[STRING_LENGTH], dpath[STRING_LENGTH];
struct stat source_stat, dest_stat;
dest_stat.st_mode = 0;
if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) )
continue;
snprintf (spath, sizeof spath, "%s/%s", dir_name, de->d_name);
if (lstat (spath, &source_stat) != 0)
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", spath);
#endif
continue;
}
snprintf (dpath, sizeof dpath, "%s%s", mount_point, spath + rootlen);
lstat (dpath, &dest_stat);
if ( S_ISLNK (source_stat.st_mode) || (source_stat.st_mode & S_ISVTX) )
copy_inode (dpath, &dest_stat, (source_stat.st_mode & ~S_ISVTX) , spath, &source_stat);
if ( S_ISDIR (source_stat.st_mode) )
do_restore (spath, rootlen);
}
closedir (dp);
} /* End Function do_restore */
static int copy_inode (const char *destpath, const struct stat *dest_stat,
mode_t new_mode,
const char *sourcepath, const struct stat *source_stat)
/* [SUMMARY] Copy an inode.
<destpath> The destination path. An existing inode may be deleted.
<dest_stat> The destination stat(2) information.
<new_mode> The desired new mode for the destination.
<sourcepath> The source path.
<source_stat> The source stat(2) information.
[RETURNS] TRUE on success, else FALSE.
*/
{
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "copy_inode()\n");
#endif
if ( (source_stat->st_mode & S_IFMT) == (dest_stat->st_mode & S_IFMT) )
{
/* Same type */
if ( S_ISLNK (source_stat->st_mode) )
{
int source_len, dest_len;
char source_link[STRING_LENGTH], dest_link[STRING_LENGTH];
if (( source_len = readlink (sourcepath, source_link, STRING_LENGTH - 1) ) < 0 ||
( dest_len = readlink (destpath , dest_link , STRING_LENGTH - 1) ) < 0 )
return (FALSE);
source_link[source_len] = '\0';
dest_link[dest_len] = '\0';
if ( (source_len != dest_len) || (strcmp (source_link, dest_link) != 0) )
{
unlink (destpath);
symlink (source_link, destpath);
}
return (TRUE);
} /* Else not a symlink */
chmod (destpath, new_mode & ~S_IFMT);
chown (destpath, source_stat->st_uid, source_stat->st_gid);
return (TRUE);
}
/* Different types: unlink and create */
unlink (destpath);
switch (source_stat->st_mode & S_IFMT)
{
int fd, val;
struct sockaddr_un un_addr;
char symlink_val[STRING_LENGTH];
case S_IFSOCK:
if ( ( fd = socket (AF_UNIX, SOCK_STREAM, 0) ) < 0 )
break;
un_addr.sun_family = AF_UNIX;
snprintf (un_addr.sun_path, sizeof (un_addr.sun_path), "%s", destpath);
val = bind (fd, (struct sockaddr *) &un_addr, (int) sizeof un_addr);
close (fd);
if (val != 0 || chmod (destpath, new_mode & ~S_IFMT) != 0)
break;
if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
return (TRUE);
break;
case S_IFLNK:
if ( ( val = readlink (sourcepath, symlink_val, STRING_LENGTH - 1) ) < 0 )
break;
symlink_val[val] = '\0';
if (symlink (symlink_val, destpath) == 0)
return (TRUE);
break;
case S_IFREG:
if ( ( fd = open (destpath, O_RDONLY | O_CREAT, new_mode & ~S_IFMT) ) < 0 )
break;
close (fd);
if (chmod (destpath, new_mode & ~S_IFMT) != 0)
break;
if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
return (TRUE);
break;
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
if (mknod (destpath, new_mode, source_stat->st_rdev) != 0)
break;
if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
return (TRUE);
break;
case S_IFDIR:
if (mkdir (destpath, new_mode & ~S_IFMT) != 0)
break;
if (chown (destpath, source_stat->st_uid, source_stat->st_gid) == 0)
return (TRUE);
return (TRUE);
/*break;*/
}
return (FALSE);
} /* End Function copy_inode */
static void free_config ()
/* [SUMMARY] Free the configuration information.
[RETURNS] Nothing.
*/
{
struct config_entry_struct *c_entry;
void *next;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "free_config()\n");
#endif
for (c_entry = first_config; c_entry != NULL; c_entry = next)
{
unsigned int count;
next = c_entry->next;
regfree (&c_entry->preg);
if (c_entry->action.what == AC_EXECUTE)
{
for (count = 0; count < MAX_ARGS; ++count)
{
if (c_entry->u.execute.argv[count] == NULL)
break;
free (c_entry->u.execute.argv[count]);
}
}
free (c_entry);
}
first_config = NULL;
last_config = NULL;
} /* End Function free_config */
static int get_uid_gid (int flag, const char *string)
/* [SUMMARY] Convert a string to a UID or GID value.
<flag> "UID" or "GID".
<string> The string.
[RETURNS] The UID or GID value.
*/
{
struct passwd *pw_ent;
struct group *grp_ent;
char * msg_a="user";
char * msg_b="U";
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_uid_gid()\n");
if(flag != UID && flag != GID )
msg_logger( DIE, LOG_ERR,"flag != UID && flag != GID\n");
#endif
if ( isdigit (string[0]) || ( (string[0] == '-') && isdigit (string[1]) ) )
return atoi (string);
if ( flag == UID && ( pw_ent = getpwnam (string) ) != NULL )
return (pw_ent->pw_uid);
if ( flag == GID && ( grp_ent = getgrnam (string) ) != NULL )
return (grp_ent->gr_gid);
else
{
msg_a="group";
msg_b="G";
}
msg_logger( NO_DIE, LOG_ERR,"unknown %s: %s, defaulting to %cID=0\n", msg_a, string, msg_b);
return (0);
}/* End Function get_uid_gid */
static mode_t get_mode (const char *string)
/* [SUMMARY] Convert a string to a mode value.
<string> The string.
[RETURNS] The mode value.
*/
{
mode_t mode;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_mode()\n");
#endif
if ( isdigit (string[0]) )
return strtoul (string, NULL, 8);
if (strlen (string) != 9)
msg_logger( DIE, LOG_ERR, "bad mode: %s\n", string);
mode = 0;
if (string[0] == 'r') mode |= S_IRUSR;
if (string[1] == 'w') mode |= S_IWUSR;
if (string[2] == 'x') mode |= S_IXUSR;
if (string[3] == 'r') mode |= S_IRGRP;
if (string[4] == 'w') mode |= S_IWGRP;
if (string[5] == 'x') mode |= S_IXGRP;
if (string[6] == 'r') mode |= S_IROTH;
if (string[7] == 'w') mode |= S_IWOTH;
if (string[8] == 'x') mode |= S_IXOTH;
return (mode);
} /* End Function get_mode */
static void signal_handler (int sig)
{
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "signal_handler()\n");
#endif
caught_signal = TRUE;
if (sig == SIGHUP)
caught_sighup = TRUE;
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, "Caught %s\n",(sig == SIGHUP)?"SIGHUP" : "SIGUSR1");
#endif
} /* End Function signal_handler */
static const char *get_variable (const char *variable, void *info)
{
struct get_variable_info *gv_info = info;
static char hostname[STRING_LENGTH], sbuf[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_variable()\n");
#endif
if (gethostname (hostname, STRING_LENGTH - 1) != 0)
msg_logger( DIE, LOG_ERR, "gethostname(): %m\n");
/* Here on error we should do exit(RV_SYS_ERROR), instead we do exit(EXIT_FAILURE) */
hostname[STRING_LENGTH - 1] = '\0';
if (strcmp (variable, "hostname") == 0)
return (hostname);
if (strcmp (variable, "mntpnt") == 0)
return (mount_point);
if (gv_info == NULL)
return (NULL);
if (strcmp (variable, "devpath") == 0)
return (gv_info->devpath);
if (strcmp (variable, "devname") == 0)
return (gv_info->devname);
if (strcmp (variable, "mode") == 0)
{
sprintf (sbuf, "%o", gv_info->info->mode);
return (sbuf);
}
if (strcmp (variable, "uid") == 0)
{
sprintf (sbuf, "%u", gv_info->info->uid);
return (sbuf);
}
if (strcmp (variable, "gid") == 0)
{
sprintf (sbuf, "%u", gv_info->info->gid);
return (sbuf);
}
return (NULL);
} /* End Function get_variable */
static void do_scan_and_service (const char *dir_name)
/* [SUMMARY] Scan a directory tree and generate register events on leaf nodes.
<dp> The directory pointer. This is closed upon completion.
<dir_name> The name of the directory.
[RETURNS] Nothing.
*/
{
struct stat statbuf;
DIR *dp;
struct dirent *de;
char path[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "do_scan_and_service ()\n");
#endif
if((dp = xopendir(NO_DIE, dir_name))==NULL)
return;
while ( (de = readdir (dp) ) != NULL )
{
struct devfsd_notify_struct info;
if ( (strcmp (de->d_name, ".") == 0) || (strcmp (de->d_name, "..") == 0) )
continue;
snprintf (path, sizeof (path), "%s/%s", dir_name, de->d_name);
if (lstat (path, &statbuf) != 0)
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_ERR, "%s: %m\n", path);
#endif
continue;
}
memset (&info, 0, sizeof info);
info.type = DEVFSD_NOTIFY_REGISTERED;
info.mode = statbuf.st_mode;
info.major = MAJOR (statbuf.st_rdev);
info.minor = MINOR (statbuf.st_rdev);
info.uid = statbuf.st_uid;
info.gid = statbuf.st_gid;
snprintf (info.devname, sizeof (info.devname), "%s", path + strlen (mount_point) + 1);
info.namelen = strlen (info.devname);
service_name (&info);
if ( S_ISDIR (statbuf.st_mode) )
do_scan_and_service (path);
}
closedir (dp);
} /* End Function do_scan_and_service */
static int mksymlink (const char *oldpath, const char *newpath)
/* [SUMMARY] Create a symlink, creating intervening directories as required.
<oldpath> The string contained in the symlink.
<newpath> The name of the new symlink.
[RETURNS] 0 on success, else -1.
*/
{
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "mksymlink()\n", newpath);
#endif
if ( !make_dir_tree (newpath) )
return (-1);
if (symlink (oldpath, newpath) != 0)
{
#ifdef CONFIG_DEVFSD_VERBOSE
if (errno == EEXIST)
msg_logger( NO_DIE, LOG_INFO, "symlink(): %s: already exists\n", newpath);
else
{
msg_logger( NO_DIE, LOG_ERR, "symlink(): %s: %m\n", newpath);
return (-1);
}
#else
if (errno != EEXIST)
return (-1);
#endif
}
return (0);
} /* End Function mksymlink */
static int make_dir_tree (const char *path)
/* [SUMMARY] Creating intervening directories for a path as required.
<path> The full pathname (including he leaf node).
[RETURNS] TRUE on success, else FALSE.
*/
{
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "make_dir_tree()\n");
#endif
if (bb_make_directory( (char *)path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH , FILEUTILS_RECUR )==-1)
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_ERR, "make_dir_tree(): %s: %m\n", path);
#endif
return (FALSE);
}
return(TRUE);
} /* End Function make_dir_tree */
static int expand_expression(char *output, unsigned int outsize,
const char *input,
const char *(*get_variable_func)(const char *variable, void *info),
void *info,
const char *devname,
const regmatch_t *ex, unsigned int numexp)
/* [SUMMARY] Expand enviroment variables and regular subexpressions in string.
<output> The output expanded expression is written here.
<length> The size of the output buffer.
<input> The input expression. This may equal <<output>>.
<get_variable> A function which will be used to get variable values. If
this returns NULL, the environment is searched instead. If this is NULL,
only the environment is searched.
<info> An arbitrary pointer passed to <<get_variable>>.
<devname> Device name; specifically, this is the string that contains all
of the regular subexpressions.
<ex> Array of start / end offsets into info->devname for each subexpression
<numexp> Number of regular subexpressions found in <<devname>>.
[RETURNS] TRUE on success, else FALSE.
*/
{
char temp[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "expand_expression()\n");
#endif
if ( !st_expr_expand (temp, STRING_LENGTH, input, get_variable_func, info) )
return (FALSE);
expand_regexp (output, outsize, temp, devname, ex, numexp);
return (TRUE);
} /* End Function expand_expression */
static void expand_regexp (char *output, size_t outsize, const char *input,
const char *devname,
const regmatch_t *ex, unsigned int numex )
/* [SUMMARY] Expand all occurrences of the regular subexpressions \0 to \9.
<output> The output expanded expression is written here.
<outsize> The size of the output buffer.
<input> The input expression. This may NOT equal <<output>>, because
supporting that would require yet another string-copy. However, it's not
hard to write a simple wrapper function to add this functionality for those
few cases that need it.
<devname> Device name; specifically, this is the string that contains all
of the regular subexpressions.
<ex> An array of start and end offsets into <<devname>>, one for each
subexpression
<numex> Number of subexpressions in the offset-array <<ex>>.
[RETURNS] Nothing.
*/
{
const char last_exp = '0' - 1 + numex;
int c = -1;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "expand_regexp()\n");
#endif
/* Guarantee NULL termination by writing an explicit '\0' character into
the very last byte */
if (outsize)
output[--outsize] = '\0';
/* Copy the input string into the output buffer, replacing '\\' with '\'
and '\0' .. '\9' with subexpressions 0 .. 9, if they exist. Other \x
codes are deleted */
while ( (c != '\0') && (outsize != 0) )
{
c = *input;
++input;
if (c == '\\')
{
c = *input;
++input;
if (c != '\\')
{
if ((c >= '0') && (c <= last_exp))
{
const regmatch_t *subexp = ex + (c - '0');
unsigned int sublen = subexp->rm_eo - subexp->rm_so;
/* Range checking */
if (sublen > outsize)
sublen = outsize;
strncpy (output, devname + subexp->rm_so, sublen);
output += sublen;
outsize -= sublen;
}
continue;
}
}
*output = c;
++output;
--outsize;
} /* while */
} /* End Function expand_regexp */
/* from compat_name.c */
struct translate_struct
{
char *match; /* The string to match to (up to length) */
char *format; /* Format of output, "%s" takes data past match string,
NULL is effectively "%s" (just more efficient) */
};
static struct translate_struct translate_table[] =
{
{"sound/", NULL},
{"printers/", "lp%s"},
{"v4l/", NULL},
{"parports/", "parport%s"},
{"fb/", "fb%s"},
{"netlink/", NULL},
{"loop/", "loop%s"},
{"floppy/", "fd%s"},
{"rd/", "ram%s"},
{"md/", "md%s"}, /* Meta-devices */
{"vc/", "tty%s"},
{"misc/", NULL},
{"isdn/", NULL},
{"pg/", "pg%s"}, /* Parallel port generic ATAPI interface*/
{"i2c/", "i2c-%s"},
{"staliomem/", "staliomem%s"}, /* Stallion serial driver control */
{"tts/E", "ttyE%s"}, /* Stallion serial driver */
{"cua/E", "cue%s"}, /* Stallion serial driver callout */
{"tts/R", "ttyR%s"}, /* Rocketport serial driver */
{"cua/R", "cur%s"}, /* Rocketport serial driver callout */
{"ip2/", "ip2%s"}, /* Computone serial driver control */
{"tts/F", "ttyF%s"}, /* Computone serial driver */
{"cua/F", "cuf%s"}, /* Computone serial driver callout */
{"tts/C", "ttyC%s"}, /* Cyclades serial driver */
{"cua/C", "cub%s"}, /* Cyclades serial driver callout */
{"tts/", "ttyS%s"}, /* Generic serial: must be after others */
{"cua/", "cua%s"}, /* Generic serial: must be after others */
{"input/js", "js%s"}, /* Joystick driver */
{NULL, NULL}
};
const char *get_old_name (const char *devname, unsigned int namelen,
char *buffer, unsigned int major, unsigned int minor)
/* [SUMMARY] Translate a kernel-supplied name into an old name.
<devname> The device name provided by the kernel.
<namelen> The length of the name.
<buffer> A buffer that may be used. This should be at least 128 bytes long.
<major> The major number for the device.
<minor> The minor number for the device.
[RETURNS] A pointer to the old name if known, else NULL.
*/
{
const char *compat_name = NULL;
char *ptr;
struct translate_struct *trans;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_old_name()\n");
#endif
for (trans = translate_table; trans->match != NULL; ++trans)
{
size_t len = strlen (trans->match);
if (strncmp (devname, trans->match, len) == 0)
{
if (trans->format == NULL)
return (devname + len);
sprintf (buffer, trans->format, devname + len);
return (buffer);
}
}
if (strncmp (devname, "sbp/", 4) == 0)
{
sprintf (buffer, "sbpcd%u", minor);
compat_name = buffer;
}
else if (strncmp (devname, "scsi/", 5) == 0)
{ /* All SCSI devices */
if (strcmp (devname + namelen - 7, "generic") == 0)
{
sprintf (buffer, "sg%u", minor);
compat_name = buffer;
}
else if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0)
{
char mode = ptr[2];
if (mode == 'n')
mode = '\0';
sprintf (buffer, "nst%u%c", minor & 0x1f, mode);
compat_name = buffer;
if (devname[namelen - 1] != 'n')
++compat_name;
}
else if (strcmp (devname + namelen - 2, "cd") == 0)
{
sprintf (buffer, "sr%u", minor);
compat_name = buffer;
}
else if (strcmp (devname + namelen - 4, "disc") == 0)
compat_name = write_old_sd_name (buffer, major, minor, "");
else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0)
compat_name = write_old_sd_name (buffer, major, minor, ptr + 4);
return (compat_name);
}
else if (strncmp (devname, "ide/host", 8) == 0)
{ /* All IDE devices */
if (strncmp (ptr = (strrchr (devname, '/') + 1), "mt", 2) == 0)
{
sprintf (buffer, "%sht%d", ptr + 2, minor & 0x7f);
compat_name = buffer;
}
else if (strcmp (devname + namelen - 4, "disc") == 0)
{
sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) );
compat_name = buffer;
}
else if (strncmp (ptr = (strrchr (devname, '/') + 1), "part", 4) == 0)
{
sprintf (buffer, "hd%c%s", get_old_ide_name (major, minor), ptr + 4);
compat_name = buffer;
}
else if (strcmp (devname + namelen - 2, "cd") == 0)
{
sprintf ( buffer, "hd%c", get_old_ide_name (major, minor) );
compat_name = buffer;
}
return (compat_name);
}
else if (strncmp (devname, "vcc/", 4) == 0)
{
sprintf (buffer, "vcs%s", devname + 4);
if (buffer[3] == '0')
buffer[3] = '\0';
compat_name = buffer;
}
else if (strncmp (devname, "pty/", 4) == 0)
{
int indexx = atoi (devname + 5);
const char *pty1 = "pqrstuvwxyzabcde";
const char *pty2 = "0123456789abcdef";
sprintf (buffer, "%cty%c%c", (devname[4] == 'm') ? 'p' : 't', pty1[indexx >> 4], pty2[indexx & 0x0f]);
compat_name = buffer;
}
return (compat_name);
} /* End Function get_old_name */
static char get_old_ide_name (unsigned int major, unsigned int minor)
/* [SUMMARY] Get the old IDE name for a device.
<major> The major number for the device.
<minor> The minor number for the device.
[RETURNS] The drive letter.
*/
{
char letter='y'; /* 121 */
char c='a'; /* 97 */
int i=IDE0_MAJOR;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_old_ide_name()\n");
#endif
/* I hope it works like the previous code as it saves a few bytes. Tito ;P */
do {
if( i==IDE0_MAJOR || i==IDE1_MAJOR || i==IDE2_MAJOR ||
i==IDE3_MAJOR || i==IDE4_MAJOR || i==IDE5_MAJOR ||
i==IDE6_MAJOR || i==IDE7_MAJOR || i==IDE8_MAJOR ||
i==IDE9_MAJOR )
{
if(i==major)
{
letter=c;
break;
}
c+=2;
}
i++;
} while(i<=IDE9_MAJOR);
if (minor > 63)
++letter;
return (letter);
} /* End Function get_old_ide_name */
static char *write_old_sd_name (char *buffer,
unsigned int major, unsigned int minor,
char *part)
/* [SUMMARY] Write the old SCSI disc name to a buffer.
<buffer> The buffer to write to.
<major> The major number for the device.
<minor> The minor number for the device.
<part> The partition string. Must be "" for a whole-disc entry.
[RETURNS] A pointer to the buffer on success, else NULL.
*/
{
unsigned int disc_index;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "write_old_sd_name()\n");
#endif
if (major == 8)
{
sprintf (buffer, "sd%c%s", 'a' + (minor >> 4), part);
return (buffer);
}
if ( (major > 64) && (major < 72) )
{
disc_index = ( (major - 64) << 4 ) + (minor >> 4);
if (disc_index < 26)
sprintf (buffer, "sd%c%s", 'a' + disc_index, part);
else
sprintf (buffer, "sd%c%c%s", 'a' + (disc_index / 26) - 1, 'a' + disc_index % 26,part);
return (buffer);
}
return (NULL);
} /* End Function write_old_sd_name */
/* expression.c */
/*EXPERIMENTAL_FUNCTION*/
int st_expr_expand (char *output, unsigned int length, const char *input,
const char *(*get_variable_func) (const char *variable,
void *info),
void *info)
/* [SUMMARY] Expand an expression using Borne Shell-like unquoted rules.
<output> The output expanded expression is written here.
<length> The size of the output buffer.
<input> The input expression. This may equal <<output>>.
<get_variable> A function which will be used to get variable values. If
this returns NULL, the environment is searched instead. If this is NULL,
only the environment is searched.
<info> An arbitrary pointer passed to <<get_variable>>.
[RETURNS] TRUE on success, else FALSE.
*/
{
char ch;
unsigned int len;
unsigned int out_pos = 0;
const char *env;
const char *ptr;
struct passwd *pwent;
char buffer[BUFFER_SIZE], tmp[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "st_expr_expand()\n");
#endif
if (length > BUFFER_SIZE)
length = BUFFER_SIZE;
for (; TRUE; ++input)
{
switch (ch = *input)
{
case '$':
/* Variable expansion */
input = expand_variable (buffer, length, &out_pos, ++input, get_variable_func, info);
if (input == NULL)
return (FALSE);
break;
case '~':
/* Home directory expansion */
ch = input[1];
if ( isspace (ch) || (ch == '/') || (ch == '\0') )
{
/* User's own home directory: leave separator for next time */
if ( ( env = getenv ("HOME") ) == NULL )
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, "HOME");
#endif
return (FALSE);
}
len = strlen (env);
if (len + out_pos >= length)
goto st_expr_expand_out;
memcpy (buffer + out_pos, env, len + 1);
out_pos += len;
continue;
}
/* Someone else's home directory */
for (ptr = ++input; !isspace (ch) && (ch != '/') && (ch != '\0'); ch = *++ptr)
/* VOID */ ;
len = ptr - input;
if (len >= sizeof tmp)
goto st_expr_expand_out;
safe_memcpy (tmp, input, len);
input = ptr - 1;
if ( ( pwent = getpwnam (tmp) ) == NULL )
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, "getpwnam(): %s\n", tmp);
#endif
return (FALSE);
}
len = strlen (pwent->pw_dir);
if (len + out_pos >= length)
goto st_expr_expand_out;
memcpy (buffer + out_pos, pwent->pw_dir, len + 1);
out_pos += len;
break;
case '\0':
/* Falltrough */
default:
if (out_pos >= length)
goto st_expr_expand_out;
buffer[out_pos++] = ch;
if (ch == '\0')
{
memcpy (output, buffer, out_pos);
return (TRUE);
}
break;
/* esac */
}
}
return (FALSE);
st_expr_expand_out:
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
#endif
return (FALSE);
} /* End Function st_expr_expand */
/* Private functions follow */
static const char *expand_variable (char *buffer, unsigned int length,
unsigned int *out_pos, const char *input,
const char *(*func) (const char *variable,
void *info),
void *info)
/* [SUMMARY] Expand a variable.
<buffer> The buffer to write to.
<length> The length of the output buffer.
<out_pos> The current output position. This is updated.
<input> A pointer to the input character pointer.
<func> A function which will be used to get variable values. If this
returns NULL, the environment is searched instead. If this is NULL, only
the environment is searched.
<info> An arbitrary pointer passed to <<func>>.
<errfp> Diagnostic messages are written here.
[RETURNS] A pointer to the end of this subexpression on success, else NULL.
*/
{
char ch;
int len;
unsigned int open_braces;
const char *env, *ptr;
char tmp[STRING_LENGTH];
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "expand_variable()\n");
#endif
ch = input[0];
if (ch == '$')
{
/* Special case for "$$": PID */
sprintf ( tmp, "%d", (int) getpid () );
len = strlen (tmp);
if (len + *out_pos >= length)
goto expand_variable_out;
memcpy (buffer + *out_pos, tmp, len + 1);
out_pos += len;
return (input);
}
/* Ordinary variable expansion, possibly in braces */
if (ch != '{')
{
/* Simple variable expansion */
for (ptr = input; isalnum (ch) || (ch == '_') || (ch == ':');ch = *++ptr)
/* VOID */ ;
len = ptr - input;
if (len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
input = ptr - 1;
if ( ( env = get_variable_v2 (tmp, func, info) ) == NULL )
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, bb_msg_variable_not_found, tmp);
#endif
return (NULL);
}
len = strlen (env);
if (len + *out_pos >= length)
goto expand_variable_out;
memcpy (buffer + *out_pos, env, len + 1);
*out_pos += len;
return (input);
}
/* Variable in braces: check for ':' tricks */
ch = *++input;
for (ptr = input; isalnum (ch) || (ch == '_'); ch = *++ptr)
/* VOID */;
if (ch == '}')
{
/* Must be simple variable expansion with "${var}" */
len = ptr - input;
if (len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
ptr = expand_variable (buffer, length, out_pos, tmp, func, info );
if (ptr == NULL)
return (NULL);
return (input + len);
}
if (ch != ':' || ptr[1] != '-' )
{
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO,"illegal char in var name\n");
#endif
return (NULL);
}
/* It's that handy "${var:-word}" expression. Check if var is defined */
len = ptr - input;
if (len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
/* Move input pointer to ':' */
input = ptr;
/* First skip to closing brace, taking note of nested expressions */
ptr += 2;
ch = ptr[0];
for (open_braces = 1; open_braces > 0; ch = *++ptr)
{
switch (ch)
{
case '{':
++open_braces;
break;
case '}':
--open_braces;
break;
case '\0':
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO,"\"}\" not found in: %s\n", input);
#endif
return (NULL);
default:
break;
}
}
--ptr;
/* At this point ptr should point to closing brace of "${var:-word}" */
if ( ( env = get_variable_v2 (tmp, func, info) ) != NULL )
{
/* Found environment variable, so skip the input to the closing brace
and return the variable */
input = ptr;
len = strlen (env);
if (len + *out_pos >= length)
goto expand_variable_out;
memcpy (buffer + *out_pos, env, len + 1);
*out_pos += len;
return (input);
}
/* Environment variable was not found, so process word. Advance input
pointer to start of word in "${var:-word}" */
input += 2;
len = ptr - input;
if (len >= sizeof tmp)
goto expand_variable_out;
safe_memcpy (tmp, input, len);
input = ptr;
if ( !st_expr_expand (tmp, STRING_LENGTH, tmp, func, info ) )
return (NULL);
len = strlen (tmp);
if (len + *out_pos >= length)
goto expand_variable_out;
memcpy (buffer + *out_pos, tmp, len + 1);
*out_pos += len;
return (input);
expand_variable_out:
#ifdef CONFIG_DEVFSD_VERBOSE
msg_logger( NO_DIE, LOG_INFO, bb_msg_small_buffer);
#endif
return (NULL);
} /* End Function expand_variable */
static const char *get_variable_v2 (const char *variable,
const char *(*func) (const char *variable, void *info),
void *info)
/* [SUMMARY] Get a variable from the environment or .
<variable> The variable name.
<func> A function which will be used to get the variable. If this returns
NULL, the environment is searched instead. If this is NULL, only the
environment is searched.
[RETURNS] The value of the variable on success, else NULL.
*/
{
const char *value;
#ifdef CONFIG_DEVFSD_DEBUG
msg_logger( NO_DIE, LOG_INFO, "get_variable_v2()\n");
#endif
if (func != NULL)
{
value = (*func) (variable, info);
if (value != NULL)
return (value);
}
return getenv (variable);
} /* End Function get_variable */
/* END OF CODE */
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