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getty: remove ancient termio support (was using termois anyway)

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This commit is contained in:
Denis Vlasenko 2006-11-07 01:52:10 +00:00
parent 9f60929cc4
commit 6476cc1089
1 changed files with 65 additions and 101 deletions
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166
loginutils/getty.c
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@ -19,48 +19,44 @@
#include "busybox.h" #include "busybox.h"
#include <syslog.h> #include <syslog.h>
#ifdef CONFIG_FEATURE_UTMP #if ENABLE_FEATURE_UTMP
#include <utmp.h> #include <utmp.h>
#endif #endif
/* /*
* Some heuristics to find out what environment we are in: if it is not * Some heuristics to find out what environment we are in: if it is not
* System V, assume it is SunOS 4. * System V, assume it is SunOS 4.
*/ */
#ifdef LOGIN_PROCESS /* defined in System V utmp.h */ #ifdef LOGIN_PROCESS /* defined in System V utmp.h */
#define SYSV_STYLE /* select System V style getty */ #define SYSV_STYLE /* select System V style getty */
#ifdef CONFIG_FEATURE_WTMP #include <sys/utsname.h>
#include <time.h>
#if ENABLE_FEATURE_WTMP
extern void updwtmp(const char *filename, const struct utmp *ut); extern void updwtmp(const char *filename, const struct utmp *ut);
static void update_utmp(char *line);
#endif #endif
#endif /* LOGIN_PROCESS */ #endif /* LOGIN_PROCESS */
#ifdef SYSV_STYLE /*
#include <sys/utsname.h> * Things you may want to modify.
#include <time.h> *
#endif * You may disagree with the default line-editing etc. characters defined
* below. Note, however, that DEL cannot be used for interrupt generation
/* * and for line editing at the same time.
* Things you may want to modify. */
*
* You may disagree with the default line-editing etc. characters defined
* below. Note, however, that DEL cannot be used for interrupt generation
* and for line editing at the same time.
*/
/* I doubt there are systems which still need this */ /* I doubt there are systems which still need this */
#undef HANDLE_ALLCAPS #undef HANDLE_ALLCAPS
#define _PATH_LOGIN "/bin/login" #define _PATH_LOGIN "/bin/login"
/* If ISSUE is not defined, agetty will never display the contents of the /* If ISSUE is not defined, getty will never display the contents of the
* /etc/issue file. You will not want to spit out large "issue" files at the * /etc/issue file. You will not want to spit out large "issue" files at the
* wrong baud rate. * wrong baud rate.
*/ */
#define ISSUE "/etc/issue" /* displayed before the login prompt */ #define ISSUE "/etc/issue" /* displayed before the login prompt */
/* Some shorthands for control characters. */ /* Some shorthands for control characters. */
#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */ #define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
#define CR CTL('M') /* carriage return */ #define CR CTL('M') /* carriage return */
#define NL CTL('J') /* line feed */ #define NL CTL('J') /* line feed */
@ -68,7 +64,6 @@ extern void updwtmp(const char *filename, const struct utmp *ut);
#define DEL CTL('?') /* delete */ #define DEL CTL('?') /* delete */
/* Defaults for line-editing etc. characters; you may want to change this. */ /* Defaults for line-editing etc. characters; you may want to change this. */
#define DEF_ERASE DEL /* default erase character */ #define DEF_ERASE DEL /* default erase character */
#define DEF_INTR CTL('C') /* default interrupt character */ #define DEF_INTR CTL('C') /* default interrupt character */
#define DEF_QUIT CTL('\\') /* default quit char */ #define DEF_QUIT CTL('\\') /* default quit char */
@ -77,32 +72,10 @@ extern void updwtmp(const char *filename, const struct utmp *ut);
#define DEF_EOL '\n' #define DEF_EOL '\n'
#define DEF_SWITCH 0 /* default switch char */ #define DEF_SWITCH 0 /* default switch char */
/* /*
* SunOS 4.1.1 termio is broken. We must use the termios stuff instead, * When multiple baud rates are specified on the command line, the first one
* because the termio -> termios translation does not clear the termios * we will try is the first one specified.
* CIBAUD bits. Therefore, the tty driver would sometimes report that input */
* baud rate != output baud rate. I did not notice that problem with SunOS
* 4.1. We will use termios where available, and termio otherwise.
*/
/* linux 0.12 termio is broken too, if we use it c_cc[VERASE] isn't set
properly, but all is well if we use termios?! */
#ifdef TCGETS
#undef TCGETA
#undef TCSETA
#undef TCSETAW
#define termio termios
#define TCGETA TCGETS
#define TCSETA TCSETS
#define TCSETAW TCSETSW
#endif
/*
* When multiple baud rates are specified on the command line, the first one
* we will try is the first one specified.
*/
#define FIRST_SPEED 0 #define FIRST_SPEED 0
/* Storage for command-line options. */ /* Storage for command-line options. */
@ -134,7 +107,6 @@ static const char opt_string[] = "I:LH:f:hil:mt:wn";
#define F_NOPROMPT (1<<10) /* don't ask for login name! */ #define F_NOPROMPT (1<<10) /* don't ask for login name! */
/* Storage for things detected while the login name was read. */ /* Storage for things detected while the login name was read. */
struct chardata { struct chardata {
unsigned char erase; /* erase character */ unsigned char erase; /* erase character */
unsigned char kill; /* kill character */ unsigned char kill; /* kill character */
@ -146,7 +118,6 @@ struct chardata {
}; };
/* Initial values for the above. */ /* Initial values for the above. */
static const struct chardata init_chardata = { static const struct chardata init_chardata = {
DEF_ERASE, /* default erase character */ DEF_ERASE, /* default erase character */
DEF_KILL, /* default kill character */ DEF_KILL, /* default kill character */
@ -157,12 +128,6 @@ static const struct chardata init_chardata = {
#endif #endif
}; };
#ifdef SYSV_STYLE
#ifdef CONFIG_FEATURE_UTMP
static void update_utmp(char *line);
#endif
#endif
/* The following is used for understandable diagnostics. */ /* The following is used for understandable diagnostics. */
/* Fake hostname for ut_host specified on command line. */ /* Fake hostname for ut_host specified on command line. */
@ -268,7 +233,7 @@ static void xdup2(int srcfd, int dstfd, const char *tty)
} }
/* open_tty - set up tty as standard { input, output, error } */ /* open_tty - set up tty as standard { input, output, error } */
static void open_tty(char *tty, struct termio *tp, int local) static void open_tty(char *tty, struct termios *tp, int local)
{ {
int chdir_to_root = 0; int chdir_to_root = 0;
@ -318,8 +283,8 @@ static void open_tty(char *tty, struct termio *tp, int local)
* 5 seconds seems to be a good value. * 5 seconds seems to be a good value.
*/ */
if (ioctl(0, TCGETA, tp) < 0) if (ioctl(0, TCGETS, tp) < 0)
bb_perror_msg_and_die("%s: ioctl(TCGETA)", tty); bb_perror_msg_and_die("%s: ioctl(TCGETS)", tty);
/* /*
* It seems to be a terminal. Set proper protections and ownership. Mode * It seems to be a terminal. Set proper protections and ownership. Mode
@ -369,11 +334,11 @@ static void open_tty(char *tty, struct termio *tp, int local)
xchdir("/"); xchdir("/");
} }
/* termio_init - initialize termio settings */ /* termios_init - initialize termios settings */
static void termio_init(struct termio *tp, int speed, struct options *op) static void termios_init(struct termios *tp, int speed, struct options *op)
{ {
/* /*
* Initial termio settings: 8-bit characters, raw-mode, blocking i/o. * Initial termios settings: 8-bit characters, raw-mode, blocking i/o.
* Special characters are set after we have read the login name; all * Special characters are set after we have read the login name; all
* reads will be done in raw mode anyway. Errors will be dealt with * reads will be done in raw mode anyway. Errors will be dealt with
* later on. * later on.
@ -400,7 +365,7 @@ static void termio_init(struct termio *tp, int speed, struct options *op)
tp->c_cflag |= CRTSCTS; tp->c_cflag |= CRTSCTS;
#endif #endif
ioctl(0, TCSETA, tp); ioctl(0, TCSETS, tp);
/* go to blocking input even in local mode */ /* go to blocking input even in local mode */
fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK); fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
@ -409,7 +374,7 @@ static void termio_init(struct termio *tp, int speed, struct options *op)
} }
/* auto_baud - extract baud rate from modem status message */ /* auto_baud - extract baud rate from modem status message */
static void auto_baud(char *buf, unsigned size_buf, struct termio *tp) static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
{ {
int speed; int speed;
int vmin; int vmin;
@ -441,7 +406,7 @@ static void auto_baud(char *buf, unsigned size_buf, struct termio *tp)
tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */ tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
vmin = tp->c_cc[VMIN]; vmin = tp->c_cc[VMIN];
tp->c_cc[VMIN] = 0; /* don't block if queue empty */ tp->c_cc[VMIN] = 0; /* don't block if queue empty */
ioctl(0, TCSETA, tp); ioctl(0, TCSETS, tp);
/* /*
* Wait for a while, then read everything the modem has said so far and * Wait for a while, then read everything the modem has said so far and
@ -467,23 +432,23 @@ static void auto_baud(char *buf, unsigned size_buf, struct termio *tp)
tp->c_iflag = iflag; tp->c_iflag = iflag;
tp->c_cc[VMIN] = vmin; tp->c_cc[VMIN] = vmin;
ioctl(0, TCSETA, tp); ioctl(0, TCSETS, tp);
} }
/* next_speed - select next baud rate */ /* next_speed - select next baud rate */
static void next_speed(struct termio *tp, struct options *op) static void next_speed(struct termios *tp, struct options *op)
{ {
static int baud_index = FIRST_SPEED; /* current speed index */ static int baud_index = FIRST_SPEED; /* current speed index */
baud_index = (baud_index + 1) % op->numspeed; baud_index = (baud_index + 1) % op->numspeed;
tp->c_cflag &= ~CBAUD; tp->c_cflag &= ~CBAUD;
tp->c_cflag |= op->speeds[baud_index]; tp->c_cflag |= op->speeds[baud_index];
ioctl(0, TCSETA, tp); ioctl(0, TCSETS, tp);
} }
/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */ /* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
static void do_prompt(struct options *op, struct termio *tp) static void do_prompt(struct options *op, struct termios *tp)
{ {
#ifdef ISSUE #ifdef ISSUE
print_login_issue(op->issue, op->tty); print_login_issue(op->issue, op->tty);
@ -506,7 +471,7 @@ static int caps_lock(const char *s)
/* get_logname - get user name, establish parity, speed, erase, kill, eol */ /* get_logname - get user name, establish parity, speed, erase, kill, eol */
/* return NULL on failure, logname on success */ /* return NULL on failure, logname on success */
static char *get_logname(char *logname, unsigned size_logname, static char *get_logname(char *logname, unsigned size_logname,
struct options *op, struct chardata *cp, struct termio *tp) struct options *op, struct chardata *cp, struct termios *tp)
{ {
char *bp; char *bp;
char c; /* input character, full eight bits */ char c; /* input character, full eight bits */
@ -621,8 +586,8 @@ static char *get_logname(char *logname, unsigned size_logname,
return logname; return logname;
} }
/* termio_final - set the final tty mode bits */ /* termios_final - set the final tty mode bits */
static void termio_final(struct options *op, struct termio *tp, struct chardata *cp) static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
{ {
/* General terminal-independent stuff. */ /* General terminal-independent stuff. */
@ -681,13 +646,13 @@ static void termio_final(struct options *op, struct termio *tp, struct chardata
/* Finally, make the new settings effective */ /* Finally, make the new settings effective */
if (ioctl(0, TCSETA, tp) < 0) if (ioctl(0, TCSETS, tp) < 0)
bb_perror_msg_and_die("%s: ioctl(TCSETA)", op->tty); bb_perror_msg_and_die("%s: ioctl(TCSETS)", op->tty);
} }
#ifdef SYSV_STYLE #ifdef SYSV_STYLE
#ifdef CONFIG_FEATURE_UTMP #if ENABLE_FEATURE_UTMP
/* update_utmp - update our utmp entry */ /* update_utmp - update our utmp entry */
static void update_utmp(char *line) static void update_utmp(char *line)
{ {
@ -695,9 +660,6 @@ static void update_utmp(char *line)
struct utmp *utp; struct utmp *utp;
time_t t; time_t t;
int mypid = getpid(); int mypid = getpid();
#if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
struct flock lock;
#endif
/* /*
* The utmp file holds miscellaneous information about things started by * The utmp file holds miscellaneous information about things started by
@ -737,7 +699,7 @@ static void update_utmp(char *line)
pututline(&ut); pututline(&ut);
endutent(); endutent();
#ifdef CONFIG_FEATURE_WTMP #if ENABLE_FEATURE_WTMP
if (access(bb_path_wtmp_file, R_OK|W_OK) == -1) if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
close(creat(bb_path_wtmp_file, 0664)); close(creat(bb_path_wtmp_file, 0664));
updwtmp(bb_path_wtmp_file, &ut); updwtmp(bb_path_wtmp_file, &ut);
@ -752,10 +714,11 @@ int getty_main(int argc, char **argv)
{ {
int nullfd; int nullfd;
char *logname = NULL; /* login name, given to /bin/login */ char *logname = NULL; /* login name, given to /bin/login */
// TODO: we can merge these into "struct local" /* Merging these into "struct local" may _seem_ to reduce
// (will reduce parameter passing) * parameter passing, but today's gcc will inline
* statics which are called once anyway, so don't do that */
struct chardata chardata; /* set by get_logname() */ struct chardata chardata; /* set by get_logname() */
struct termio termio; /* terminal mode bits */ struct termios termios; /* terminal mode bits */
struct options options = { struct options options = {
0, /* show /etc/issue (SYSV_STYLE) */ 0, /* show /etc/issue (SYSV_STYLE) */
0, /* no timeout */ 0, /* no timeout */
@ -783,11 +746,12 @@ int getty_main(int argc, char **argv)
/* Was "/dev/console". Why should we spam *system console* /* Was "/dev/console". Why should we spam *system console*
* if there is a problem with getty on /dev/ttyS15?... */ * if there is a problem with getty on /dev/ttyS15?... */
nullfd = xopen(bb_dev_null, O_RDWR); nullfd = xopen(bb_dev_null, O_RDWR);
dup2(nullfd, 0); if (nullfd) {
dup2(nullfd, 1); dup2(nullfd, 0);
dup2(nullfd, 2);
if (nullfd > 2)
close(nullfd); close(nullfd);
}
dup2(0, 1);
dup2(0, 2);
/* We want special flavor of error_msg_and_die */ /* We want special flavor of error_msg_and_die */
die_sleep = 10; die_sleep = 10;
msg_eol = "\r\n"; msg_eol = "\r\n";
@ -811,7 +775,7 @@ int getty_main(int argc, char **argv)
parse_args(argc, argv, &options); parse_args(argc, argv, &options);
#ifdef SYSV_STYLE #ifdef SYSV_STYLE
#ifdef CONFIG_FEATURE_UTMP #if ENABLE_FEATURE_UTMP
/* Update the utmp file. */ /* Update the utmp file. */
update_utmp(options.tty); update_utmp(options.tty);
#endif #endif
@ -819,7 +783,7 @@ int getty_main(int argc, char **argv)
debug("calling open_tty\n"); debug("calling open_tty\n");
/* Open the tty as standard { input, output, error }. */ /* Open the tty as standard { input, output, error }. */
open_tty(options.tty, &termio, options.flags & F_LOCAL); open_tty(options.tty, &termios, options.flags & F_LOCAL);
#ifdef __linux__ #ifdef __linux__
{ {
@ -829,9 +793,9 @@ int getty_main(int argc, char **argv)
ioctl(0, TIOCSPGRP, &iv); ioctl(0, TIOCSPGRP, &iv);
} }
#endif #endif
/* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */ /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
debug("calling termio_init\n"); debug("calling termios_init\n");
termio_init(&termio, options.speeds[FIRST_SPEED], &options); termios_init(&termios, options.speeds[FIRST_SPEED], &options);
/* write the modem init string and DON'T flush the buffers */ /* write the modem init string and DON'T flush the buffers */
if (options.flags & F_INITSTRING) { if (options.flags & F_INITSTRING) {
@ -847,7 +811,7 @@ int getty_main(int argc, char **argv)
/* Optionally detect the baud rate from the modem status message. */ /* Optionally detect the baud rate from the modem status message. */
debug("before autobaud\n"); debug("before autobaud\n");
if (options.flags & F_PARSE) if (options.flags & F_PARSE)
auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termio); auto_baud(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios);
/* Set the optional timer. */ /* Set the optional timer. */
if (options.timeout) if (options.timeout)
@ -873,9 +837,9 @@ int getty_main(int argc, char **argv)
/* Read the login name. */ /* Read the login name. */
debug("reading login name\n"); debug("reading login name\n");
logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1),
&options, &chardata, &termio); &options, &chardata, &termios);
while (logname == NULL) while (logname == NULL)
next_speed(&termio, &options); next_speed(&termios, &options);
} }
/* Disable timer. */ /* Disable timer. */
@ -883,9 +847,9 @@ int getty_main(int argc, char **argv)
if (options.timeout) if (options.timeout)
alarm(0); alarm(0);
/* Finalize the termio settings. */ /* Finalize the termios settings. */
termio_final(&options, &termio, &chardata); termios_final(&options, &termios, &chardata);
/* Now the newline character should be properly written. */ /* Now the newline character should be properly written. */