/* vi: set sw=4 ts=4: */
/* agetty.c - another getty program for Linux. By W. Z. Venema 1989
- Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
- This program is freely distributable. The entire man-page used to
- be here. Now read the real man-page agetty.8 instead.
-
- -f option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
-
- 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
- - added Native Language Support
-
- 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
- - enable hardware flow control before displaying /etc/issue
-
-*/
+ * Ported to Linux by Peter Orbaek <poe@daimi.aau.dk>
+ * This program is freely distributable. The entire man-page used to
+ * be here. Now read the real man-page agetty.8 instead.
+ *
+ * option added by Eric Rasmussen <ear@usfirst.org> - 12/28/95
+ *
+ * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
+ * - added Native Language Support
+
+ * 1999-05-05 Thorsten Kranzkowski <dl8bcu@gmx.net>
+ * - enable hardware flow control before displaying /etc/issue
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ *
+ */
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <sys/stat.h>
-#include <sys/signal.h>
+#include <signal.h>
#include <fcntl.h>
#include <stdarg.h>
#include <ctype.h>
-#include <utmp.h>
#include <getopt.h>
#include <termios.h>
#include "busybox.h"
+#ifdef CONFIG_FEATURE_UTMP
+#include <utmp.h>
+#endif
+
#define _PATH_LOGIN "/bin/login"
/* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
#ifdef CONFIG_SYSLOGD
#include <sys/param.h>
-#define USE_SYSLOG
#include <syslog.h>
#endif
* System V, assume it is SunOS 4.
*/
-#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
-#define SYSV_STYLE /* select System V style getty */
-#ifdef CONFIG_FEATURE_U_W_TMP
+#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
+#define SYSV_STYLE /* select System V style getty */
+#ifdef CONFIG_FEATURE_WTMP
extern void updwtmp(const char *filename, const struct utmp *ut);
#endif
#endif /* LOGIN_PROCESS */
/*
* Things you may want to modify.
- *
- * If ISSUE is not defined, agetty will never display the contents of the
- * /etc/issue file. You will not want to spit out large "issue" files at the
- * wrong baud rate. Relevant for System V only.
- *
+ *
* 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.
*/
-#ifdef SYSV_STYLE
-#define ISSUE "/etc/issue" /* displayed before the login prompt */
+#ifdef SYSV_STYLE
#include <sys/utsname.h>
#include <time.h>
#endif
+ /* If ISSUE is not defined, agetty will never display the contents of the
+ * /etc/issue file. You will not want to spit out large "issue" files at the
+ * wrong baud rate.
+ */
+#define ISSUE "/etc/issue" /* displayed before the login prompt */
+
/* Some shorthands for control characters. */
-#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
-#define CR CTL('M') /* carriage return */
-#define NL CTL('J') /* line feed */
-#define BS CTL('H') /* back space */
-#define DEL CTL('?') /* delete */
+#define CTL(x) (x ^ 0100) /* Assumes ASCII dialect */
+#define CR CTL('M') /* carriage return */
+#define NL CTL('J') /* line feed */
+#define BS CTL('H') /* back space */
+#define DEL CTL('?') /* delete */
/* Defaults for line-editing etc. characters; you may want to change this. */
-#define DEF_ERASE DEL /* default erase character */
-#define DEF_INTR CTL('C') /* default interrupt character */
-#define DEF_QUIT CTL('\\') /* default quit char */
-#define DEF_KILL CTL('U') /* default kill char */
-#define DEF_EOF CTL('D') /* default EOF char */
-#define DEF_EOL 0
-#define DEF_SWITCH 0 /* default switch char */
+#define DEF_ERASE DEL /* default erase character */
+#define DEF_INTR CTL('C') /* default interrupt character */
+#define DEF_QUIT CTL('\\') /* default quit char */
+#define DEF_KILL CTL('U') /* default kill char */
+#define DEF_EOF CTL('D') /* default EOF char */
+#define DEF_EOL '\n'
+#define DEF_SWITCH 0 /* default switch char */
/*
* SunOS 4.1.1 termio is broken. We must use the termios stuff instead,
/* 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
-
- /*
- * This program tries to not use the standard-i/o library. This keeps the
- * executable small on systems that do not have shared libraries (System V
- * Release <3).
- */
-#ifndef BUFSIZ
-#define BUFSIZ 1024
+#ifdef TCGETS
+#undef TCGETA
+#undef TCSETA
+#undef TCSETAW
+#define termio termios
+#define TCGETA TCGETS
+#define TCSETA TCSETS
+#define TCSETAW TCSETSW
#endif
/*
* we will try is the first one specified.
*/
-#define FIRST_SPEED 0
+#define FIRST_SPEED 0
/* Storage for command-line options. */
-#define MAX_SPEED 10 /* max. nr. of baud rates */
+#define MAX_SPEED 10 /* max. nr. of baud rates */
struct options {
- int flags; /* toggle switches, see below */
- int timeout; /* time-out period */
- char *login; /* login program */
- char *tty; /* name of tty */
- char *initstring; /* modem init string */
- char *issue; /* alternative issue file */
- int numspeed; /* number of baud rates to try */
- int speeds[MAX_SPEED]; /* baud rates to be tried */
+ int flags; /* toggle switches, see below */
+ int timeout; /* time-out period */
+ char *login; /* login program */
+ char *tty; /* name of tty */
+ char *initstring; /* modem init string */
+ char *issue; /* alternative issue file */
+ int numspeed; /* number of baud rates to try */
+ int speeds[MAX_SPEED]; /* baud rates to be tried */
};
-#define F_PARSE (1<<0) /* process modem status messages */
-#define F_ISSUE (1<<1) /* display /etc/issue */
-#define F_RTSCTS (1<<2) /* enable RTS/CTS flow control */
-#define F_LOCAL (1<<3) /* force local */
-#define F_INITSTRING (1<<4) /* initstring is set */
-#define F_WAITCRLF (1<<5) /* wait for CR or LF */
-#define F_CUSTISSUE (1<<6) /* give alternative issue file */
-#define F_NOPROMPT (1<<7) /* don't ask for login name! */
+static const char opt_string[] = "I:LH:f:hil:mt:wn";
+#define F_INITSTRING (1<<0) /* initstring is set */
+#define F_LOCAL (1<<1) /* force local */
+#define F_FAKEHOST (1<<2) /* force fakehost */
+#define F_CUSTISSUE (1<<3) /* give alternative issue file */
+#define F_RTSCTS (1<<4) /* enable RTS/CTS flow control */
+#define F_ISSUE (1<<5) /* display /etc/issue */
+#define F_LOGIN (1<<6) /* non-default login program */
+#define F_PARSE (1<<7) /* process modem status messages */
+#define F_TIMEOUT (1<<8) /* time out */
+#define F_WAITCRLF (1<<9) /* wait for CR or LF */
+#define F_NOPROMPT (1<<10) /* don't ask for login name! */
/* Storage for things detected while the login name was read. */
struct chardata {
- int erase; /* erase character */
- int kill; /* kill character */
- int eol; /* end-of-line character */
- int parity; /* what parity did we see */
- int capslock; /* upper case without lower case */
+ int erase; /* erase character */
+ int kill; /* kill character */
+ int eol; /* end-of-line character */
+ int parity; /* what parity did we see */
+ int capslock; /* upper case without lower case */
};
/* Initial values for the above. */
-struct chardata init_chardata = {
- DEF_ERASE, /* default erase character */
- DEF_KILL, /* default kill character */
- 13, /* default eol char */
- 0, /* space parity */
- 0, /* no capslock */
+static struct chardata init_chardata = {
+ DEF_ERASE, /* default erase character */
+ DEF_KILL, /* default kill character */
+ 13, /* default eol char */
+ 0, /* space parity */
+ 0, /* no capslock */
};
#if 0
{2400, B2400},
{4800, B4800},
{9600, B9600},
-#ifdef B19200
+#ifdef B19200
{19200, B19200},
#endif
-#ifdef B38400
+#ifdef B38400
{38400, B38400},
#endif
-#ifdef EXTA
+#ifdef EXTA
{19200, EXTA},
#endif
-#ifdef EXTB
+#ifdef EXTB
{38400, EXTB},
#endif
#ifdef B57600
};
#endif
-static void parse_args(int argc, char **argv, struct options *op);
-static void parse_speeds(struct options *op, char *arg);
-static void open_tty(char *tty, struct termio *tp, int local);
-static void termio_init(struct termio *tp, int speed, struct options *op);
-static void auto_baud(struct termio *tp);
-static void do_prompt(struct options *op, struct termio *tp);
-static void next_speed(struct termio *tp, struct options *op);
-static char *get_logname(struct options *op, struct chardata *cp,
-
- struct termio *tp);
-static void termio_final(struct options *op, struct termio *tp,
- struct chardata *cp);
-static int caps_lock(const char *s);
-static int bcode(const char *s);
-static void error(const char *fmt, ...) __attribute__ ((noreturn));
-
-#ifdef CONFIG_FEATURE_U_W_TMP
+#ifdef SYSV_STYLE
+#ifdef CONFIG_FEATURE_UTMP
static void update_utmp(char *line);
#endif
+#endif
/* The following is used for understandable diagnostics. */
#define DEBUGTERM "/dev/ttyp0"
FILE *dbf;
#else
-#define debug(s) /* nothing */
+#define debug(s) /* nothing */
#endif
-int getty_main(int argc, char **argv)
-{
- char *logname = NULL; /* login name, given to /bin/login */
- struct chardata chardata; /* set by get_logname() */
- struct termio termio; /* terminal mode bits */
- static struct options options = {
- F_ISSUE, /* show /etc/issue (SYSV_STYLE) */
- 0, /* no timeout */
- _PATH_LOGIN, /* default login program */
- "tty1", /* default tty line */
- "", /* modem init string */
- ISSUE, /* default issue file */
- 0, /* no baud rates known yet */
- };
-#ifdef DEBUGGING
- dbf = bb_xfopen(DEBUGTERM, "w");
+/*
+ * output error messages
+ */
+static void error(const char *fmt, ...) ATTRIBUTE_NORETURN;
+static void error(const char *fmt, ...)
+{
+ va_list va_alist;
+ char buf[256];
- {
- int i;
+#ifdef CONFIG_SYSLOGD
+ va_start(va_alist, fmt);
+ vsnprintf(buf, sizeof(buf), fmt, va_alist);
+ openlog(bb_applet_name, 0, LOG_AUTH);
+ syslog(LOG_ERR, "%s", buf);
+ closelog();
+#else
+ int fd;
+ size_t l;
- for (i = 1; i < argc; i++) {
- debug(argv[i]);
- debug("\n");
- }
+ snprintf(buf, sizeof(buf), "%s: ", bb_applet_name);
+ l = strlen(buf);
+ va_start(va_alist, fmt);
+ vsnprintf(buf + l, sizeof(buf) - l, fmt, va_alist);
+ l = strlen(buf);
+ /* truncate if need */
+ if((l + 3) > sizeof(buf))
+ l = sizeof(buf) - 3;
+ /* add \r\n always */
+ buf[l++] = '\r';
+ buf[l++] = '\n';
+ buf[l] = 0;
+ if ((fd = open("/dev/console", 1)) >= 0) {
+ write(fd, buf, l);
+ close(fd);
}
#endif
- /* Parse command-line arguments. */
-
- parse_args(argc, argv, &options);
-
-#ifdef __linux__
- setsid();
-#endif
-
- /* Update the utmp file. */
-
+ va_end(va_alist);
-#ifdef SYSV_STYLE
-#ifdef CONFIG_FEATURE_U_W_TMP
- update_utmp(options.tty);
-#endif
-#endif
+ (void) sleep((unsigned) 10); /* be kind to init(8) */
+ exit(1);
+}
- debug("calling open_tty\n");
- /* Open the tty as standard { input, output, error }. */
- open_tty(options.tty, &termio, options.flags & F_LOCAL);
-#ifdef __linux__
- {
- int iv;
- iv = getpid();
- ioctl(0, TIOCSPGRP, &iv);
- }
-#endif
- /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
- debug("calling termio_init\n");
- termio_init(&termio, options.speeds[FIRST_SPEED], &options);
-
- /* write the modem init string and DON'T flush the buffers */
- if (options.flags & F_INITSTRING) {
- debug("writing init string\n");
- write(1, options.initstring, strlen(options.initstring));
+/* bcode - convert speed string to speed code; return 0 on failure */
+static int bcode(const char *s)
+{
+ int r;
+ unsigned long value;
+ if (safe_strtoul((char *)s, &value)) {
+ return -1;
}
-
- if (!(options.flags & F_LOCAL)) {
- /* go to blocking write mode unless -L is specified */
- fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
+ if ((r = tty_value_to_baud(value)) > 0) {
+ return r;
}
+ return 0;
+}
- /* Optionally detect the baud rate from the modem status message. */
- debug("before autobaud\n");
- if (options.flags & F_PARSE)
- auto_baud(&termio);
-
- /* Set the optional timer. */
- if (options.timeout)
- (void) alarm((unsigned) options.timeout);
- /* optionally wait for CR or LF before writing /etc/issue */
- if (options.flags & F_WAITCRLF) {
- char ch;
-
- debug("waiting for cr-lf\n");
- while (read(0, &ch, 1) == 1) {
- ch &= 0x7f; /* strip "parity bit" */
-#ifdef DEBUGGING
- fprintf(dbf, "read %c\n", ch);
-#endif
- if (ch == '\n' || ch == '\r')
- break;
- }
- }
+/* parse_speeds - parse alternate baud rates */
+static void parse_speeds(struct options *op, char *arg)
+{
+ char *cp;
- chardata = init_chardata;
- if (!(options.flags & F_NOPROMPT)) {
- /* Read the login name. */
- debug("reading login name\n");
- /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
- while ((logname = get_logname(&options, &chardata, &termio)) ==
- NULL) next_speed(&termio, &options);
+ debug("entered parse_speeds\n");
+ for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
+ if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
+ error("bad speed: %s", cp);
+ if (op->numspeed > MAX_SPEED)
+ error("too many alternate speeds");
}
-
- /* Disable timer. */
-
- if (options.timeout)
- (void) alarm(0);
-
- /* Finalize the termio settings. */
-
- termio_final(&options, &termio, &chardata);
-
- /* Now the newline character should be properly written. */
-
- (void) write(1, "\n", 1);
-
- /* Let the login program take care of password validation. */
-
- (void) execl(options.login, options.login, "--", logname, (char *) 0);
- error("%s: can't exec %s: %m", options.tty, options.login);
+ debug("exiting parsespeeds\n");
}
-/* parse-args - parse command-line arguments */
+/* parse-args - parse command-line arguments */
static void parse_args(int argc, char **argv, struct options *op)
{
- extern char *optarg; /* getopt */
- extern int optind; /* getopt */
- int c;
-
- while (isascii(c = getopt(argc, argv, "I:LH:f:hil:mt:wn"))) {
- switch (c) {
- case 'I':
- if (!(op->initstring = strdup(optarg)))
- error(bb_msg_memory_exhausted);
-
- {
- const char *p;
- char *q;
-
- /* copy optarg into op->initstring decoding \ddd
- octal codes into chars */
- q = op->initstring;
- p = optarg;
- while (*p) {
- if (*p == '\\') {
- p++;
- *q++ = bb_process_escape_sequence(&p);
- } else {
- *q++ = *p++;
- }
- }
- *q = '\0';
+ char *ts;
+
+ op->flags = bb_getopt_ulflags(argc, argv, opt_string,
+ &(op->initstring), &fakehost, &(op->issue),
+ &(op->login), &ts);
+ if(op->flags & F_INITSTRING) {
+ const char *p = op->initstring;
+ char *q;
+
+ q = op->initstring = bb_xstrdup(op->initstring);
+ /* copy optarg into op->initstring decoding \ddd
+ octal codes into chars */
+ while (*p) {
+ if (*p == '\\') {
+ p++;
+ *q++ = bb_process_escape_sequence(&p);
+ } else {
+ *q++ = *p++;
}
- op->flags |= F_INITSTRING;
- break;
-
- case 'L': /* force local */
- op->flags |= F_LOCAL;
- break;
- case 'H': /* fake login host */
- fakehost = optarg;
- break;
- case 'f': /* custom issue file */
- op->flags |= F_CUSTISSUE;
- op->issue = optarg;
- break;
- case 'h': /* enable h/w flow control */
- op->flags |= F_RTSCTS;
- break;
- case 'i': /* do not show /etc/issue */
- op->flags &= ~F_ISSUE;
- break;
- case 'l':
- op->login = optarg; /* non-default login program */
- break;
- case 'm': /* parse modem status message */
- op->flags |= F_PARSE;
- break;
- case 'n':
- op->flags |= F_NOPROMPT;
- break;
- case 't': /* time out */
- if ((op->timeout = atoi(optarg)) <= 0)
- error("bad timeout value: %s", optarg);
- break;
- case 'w':
- op->flags |= F_WAITCRLF;
- break;
- default:
- bb_show_usage();
}
+ *q = '\0';
+ }
+ op->flags ^= F_ISSUE; /* revert flag show /etc/issue */
+ if(op->flags & F_TIMEOUT) {
+ if ((op->timeout = atoi(ts)) <= 0)
+ error("bad timeout value: %s", ts);
}
debug("after getopt loop\n");
- if (argc < optind + 2) /* check parameter count */
+ if (argc < optind + 2) /* check parameter count */
bb_show_usage();
/* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
if ('0' <= argv[optind][0] && argv[optind][0] <= '9') {
/* a number first, assume it's a speed (BSD style) */
- parse_speeds(op, argv[optind++]); /* baud rate(s) */
- op->tty = argv[optind]; /* tty name */
+ parse_speeds(op, argv[optind++]); /* baud rate(s) */
+ op->tty = argv[optind]; /* tty name */
} else {
- op->tty = argv[optind++]; /* tty name */
- parse_speeds(op, argv[optind]); /* baud rate(s) */
+ op->tty = argv[optind++]; /* tty name */
+ parse_speeds(op, argv[optind]); /* baud rate(s) */
}
optind++;
debug("exiting parseargs\n");
}
-/* parse_speeds - parse alternate baud rates */
-
-static void parse_speeds(struct options *op, char *arg)
-{
- char *cp;
-
- debug("entered parse_speeds\n");
- for (cp = strtok(arg, ","); cp != 0; cp = strtok((char *) 0, ",")) {
- if ((op->speeds[op->numspeed++] = bcode(cp)) <= 0)
- error("bad speed: %s", cp);
- if (op->numspeed > MAX_SPEED)
- error("too many alternate speeds");
- }
- debug("exiting parsespeeds\n");
-}
-
-#ifdef SYSV_STYLE
-#ifdef CONFIG_FEATURE_U_W_TMP
-
-/* update_utmp - update our utmp entry */
-static void update_utmp(char *line)
-{
- struct utmp ut;
- struct utmp *utp;
- time_t t;
- 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
- * /sbin/init and other system-related events. Our purpose is to update
- * the utmp entry for the current process, in particular the process type
- * and the tty line we are listening to. Return successfully only if the
- * utmp file can be opened for update, and if we are able to find our
- * entry in the utmp file.
- */
- utmpname(_PATH_UTMP);
- setutent();
- while ((utp = getutent())
- && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
- ;
-
- if (utp) {
- memcpy(&ut, utp, sizeof(ut));
- } else {
- /* some inits don't initialize utmp... */
- memset(&ut, 0, sizeof(ut));
- strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
- }
- /*endutent(); */
-
- strncpy(ut.ut_user, "LOGIN", sizeof(ut.ut_user));
- strncpy(ut.ut_line, line, sizeof(ut.ut_line));
- if (fakehost)
- strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
- time(&t);
- ut.ut_time = t;
- ut.ut_type = LOGIN_PROCESS;
- ut.ut_pid = mypid;
-
- pututline(&ut);
- endutent();
-
- {
- updwtmp(_PATH_WTMP, &ut);
- }
-}
-
-#endif /* CONFIG_FEATURE_U_W_TMP */
-#endif /* SYSV_STYLE */
-
/* open_tty - set up tty as standard { input, output, error } */
static void open_tty(char *tty, struct termio *tp, int local)
{
- /* Get rid of the present standard { output, error} if any. */
-
- (void) close(1);
- (void) close(2);
- errno = 0; /* ignore above errors */
+ int chdir_to_root = 0;
/* Set up new standard input, unless we are given an already opened port. */
if (strcmp(tty, "-")) {
struct stat st;
+ int fd;
/* Sanity checks... */
if (chdir("/dev"))
error("/dev: chdir() failed: %m");
+ chdir_to_root = 1;
if (stat(tty, &st) < 0)
error("/dev/%s: %m", tty);
if ((st.st_mode & S_IFMT) != S_IFCHR)
/* Open the tty as standard input. */
- (void) close(0);
- errno = 0; /* ignore close(2) errors */
-
+ close(0);
debug("open(2)\n");
- if (open(tty, O_RDWR | O_NONBLOCK, 0) != 0)
+ fd = open(tty, O_RDWR | O_NONBLOCK, 0);
+ if (fd != 0)
error("/dev/%s: cannot open as standard input: %m", tty);
-
} else {
/*
error("%s: not open for read/write", tty);
}
- /* Set up standard output and standard error file descriptors. */
+ /* Replace current standard output/error fd's with new ones */
debug("duping\n");
- if (dup(0) != 1 || dup(0) != 2) /* set up stdout and stderr */
- error("%s: dup problem: %m", tty); /* we have a problem */
+ if (dup2(STDIN_FILENO, STDOUT_FILENO) == -1 ||
+ dup2(STDIN_FILENO, STDERR_FILENO) == -1)
+ error("%s: dup problem: %m", tty); /* we have a problem */
/*
* The following ioctl will fail if stdin is not a tty, but also when
}
}
#else
- (void) chown(tty, 0, 0); /* root, sys */
- (void) chmod(tty, 0622); /* crw--w--w- */
- errno = 0; /* ignore above errors */
+ (void) chown(tty, 0, 0); /* root, sys */
+ (void) chmod(tty, 0622); /* crw--w--w- */
#endif
+ if(chdir_to_root && chdir("/"))
+ error("chdir to / failed: %m");
}
/* termio_init - initialize termio settings */
-
static void termio_init(struct termio *tp, int speed, struct options *op)
{
-
/*
* Initial termio settings: 8-bit characters, raw-mode, blocking i/o.
* Special characters are set after we have read the login name; all
/* Optionally enable hardware flow control */
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
* the DCD line, and if the computer is fast enough to set the proper
* baud rate before the message has gone by. We expect a message of the
* following format:
- *
+ *
* <junk><number><junk>
- *
+ *
* The number is interpreted as the baud rate of the incoming call. If the
* modem does not tell us the baud rate within one second, we will keep
* using the current baud rate. It is advisable to enable BREAK
*/
iflag = tp->c_iflag;
- tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
+ tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */
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 */
(void) ioctl(0, TCSETA, tp);
/*
(void) ioctl(0, TCSETA, tp);
}
+/* next_speed - select next baud rate */
+static void next_speed(struct termio *tp, struct options *op)
+{
+ static int baud_index = FIRST_SPEED; /* current speed index */
+
+ baud_index = (baud_index + 1) % op->numspeed;
+ tp->c_cflag &= ~CBAUD;
+ tp->c_cflag |= op->speeds[baud_index];
+ (void) ioctl(0, TCSETA, tp);
+}
+
+
/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */
static void do_prompt(struct options *op, struct termio *tp)
{
-#ifdef ISSUE /* optional: show /etc/issue */
+#ifdef ISSUE /* optional: show /etc/issue */
print_login_issue(op->issue, op->tty);
#endif
print_login_prompt();
}
-/* next_speed - select next baud rate */
-static void next_speed(struct termio *tp, struct options *op)
+/* caps_lock - string contains upper case without lower case */
+/* returns 1 if true, 0 if false */
+static int caps_lock(const char *s)
{
- static int baud_index = FIRST_SPEED; /* current speed index */
+ int capslock;
- baud_index = (baud_index + 1) % op->numspeed;
- tp->c_cflag &= ~CBAUD;
- tp->c_cflag |= op->speeds[baud_index];
- (void) ioctl(0, TCSETA, tp);
+ for (capslock = 0; *s; s++) {
+ if (islower(*s))
+ return (0);
+ if (capslock == 0)
+ capslock = isupper(*s);
+ }
+ return (capslock);
}
+#define logname bb_common_bufsiz1
/* get_logname - get user name, establish parity, speed, erase, kill, eol */
/* return NULL on failure, logname on success */
static char *get_logname(struct options *op, struct chardata *cp, struct termio *tp)
{
- static char logname[BUFSIZ];
char *bp;
- char c; /* input character, full eight bits */
- char ascval; /* low 7 bits of input character */
- int bits; /* # of "1" bits per character */
- int mask; /* mask with 1 bit up */
- static char *erase[] = { /* backspace-space-backspace */
- "\010\040\010", /* space parity */
- "\010\040\010", /* odd parity */
- "\210\240\210", /* even parity */
- "\210\240\210", /* no parity */
+ char c; /* input character, full eight bits */
+ char ascval; /* low 7 bits of input character */
+ int bits; /* # of "1" bits per character */
+ int mask; /* mask with 1 bit up */
+ static char *erase[] = { /* backspace-space-backspace */
+ "\010\040\010", /* space parity */
+ "\010\040\010", /* odd parity */
+ "\210\240\210", /* even parity */
+ "\210\240\210", /* no parity */
};
/* Initialize kill, erase, parity etc. (also after switching speeds). */
/* Do parity bit handling. */
- if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
+ if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
if (mask & ascval)
- bits++; /* count "1" bits */
+ bits++; /* count "1" bits */
cp->parity |= ((bits & 1) ? 1 : 2);
}
/* Do erase, kill and end-of-line processing. */
switch (ascval) {
case CR:
case NL:
- *bp = 0; /* terminate logname */
- cp->eol = ascval; /* set end-of-line char */
+ *bp = 0; /* terminate logname */
+ cp->eol = ascval; /* set end-of-line char */
break;
case BS:
case DEL:
case '#':
- cp->erase = ascval; /* set erase character */
+ cp->erase = ascval; /* set erase character */
if (bp > logname) {
(void) write(1, erase[cp->parity], 3);
bp--;
break;
case CTL('U'):
case '@':
- cp->kill = ascval; /* set kill character */
+ cp->kill = ascval; /* set kill character */
while (bp > logname) {
(void) write(1, erase[cp->parity], 3);
bp--;
} else if (bp - logname >= sizeof(logname) - 1) {
error("%s: input overrun", op->tty);
} else {
- (void) write(1, &c, 1); /* echo the character */
- *bp++ = ascval; /* and store it */
+ (void) write(1, &c, 1); /* echo the character */
+ *bp++ = ascval; /* and store it */
}
break;
}
if ((cp->capslock = caps_lock(logname))) {
for (bp = logname; *bp; bp++)
if (isupper(*bp))
- *bp = tolower(*bp); /* map name to lower case */
+ *bp = tolower(*bp); /* map name to lower case */
}
return (logname);
}
{
/* General terminal-independent stuff. */
- tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
+ tp->c_iflag |= IXON | IXOFF; /* 2-way flow control */
tp->c_lflag |= ICANON | ISIG | ECHO | ECHOE | ECHOK | ECHOKE;
/* no longer| ECHOCTL | ECHOPRT */
tp->c_oflag |= OPOST;
/* tp->c_cflag = 0; */
- tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
- tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
- tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
+ tp->c_cc[VINTR] = DEF_INTR; /* default interrupt */
+ tp->c_cc[VQUIT] = DEF_QUIT; /* default quit */
+ tp->c_cc[VEOF] = DEF_EOF; /* default EOF character */
tp->c_cc[VEOL] = DEF_EOL;
- tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
+ tp->c_cc[VSWTC] = DEF_SWITCH; /* default switch character */
/* Account for special characters seen in input. */
if (cp->eol == CR) {
- tp->c_iflag |= ICRNL; /* map CR in input to NL */
- tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
+ tp->c_iflag |= ICRNL; /* map CR in input to NL */
+ tp->c_oflag |= ONLCR; /* map NL in output to CR-NL */
}
- tp->c_cc[VERASE] = cp->erase; /* set erase character */
- tp->c_cc[VKILL] = cp->kill; /* set kill character */
+ tp->c_cc[VERASE] = cp->erase; /* set erase character */
+ tp->c_cc[VKILL] = cp->kill; /* set kill character */
/* Account for the presence or absence of parity bits in input. */
switch (cp->parity) {
- case 0: /* space (always 0) parity */
+ case 0: /* space (always 0) parity */
break;
- case 1: /* odd parity */
+ case 1: /* odd parity */
tp->c_cflag |= PARODD;
/* FALLTHROUGH */
- case 2: /* even parity */
+ case 2: /* even parity */
tp->c_cflag |= PARENB;
tp->c_iflag |= INPCK | ISTRIP;
/* FALLTHROUGH */
- case (1 | 2): /* no parity bit */
+ case (1 | 2): /* no parity bit */
tp->c_cflag &= ~CSIZE;
tp->c_cflag |= CS7;
break;
}
/* Optionally enable hardware flow control */
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
error("%s: ioctl: TCSETA: %m", op->tty);
}
-/* caps_lock - string contains upper case without lower case */
-/* returns 1 if true, 0 if false */
-static int caps_lock(const char *s)
+
+#ifdef SYSV_STYLE
+#ifdef CONFIG_FEATURE_UTMP
+/* update_utmp - update our utmp entry */
+static void update_utmp(char *line)
{
- int capslock;
+ struct utmp ut;
+ struct utmp *utp;
+ time_t t;
+ int mypid = getpid();
+#if ! (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1))
+ struct flock lock;
+#endif
- for (capslock = 0; *s; s++) {
- if (islower(*s))
- return (0);
- if (capslock == 0)
- capslock = isupper(*s);
+ /*
+ * The utmp file holds miscellaneous information about things started by
+ * /sbin/init and other system-related events. Our purpose is to update
+ * the utmp entry for the current process, in particular the process type
+ * and the tty line we are listening to. Return successfully only if the
+ * utmp file can be opened for update, and if we are able to find our
+ * entry in the utmp file.
+ */
+ if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
+ close(creat(_PATH_UTMP, 0664));
}
- return (capslock);
-}
+ utmpname(_PATH_UTMP);
+ setutent();
+ while ((utp = getutent())
+ && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
+ ;
-/* bcode - convert speed string to speed code; return 0 on failure */
-static int bcode(const char *s)
-{
- int r;
- unsigned long value;
- if (safe_strtoul(s, &value)) {
- return -1;
- }
- if ((r = bb_value_to_baud(value)) > 0) {
- return r;
+ if (utp) {
+ memcpy(&ut, utp, sizeof(ut));
+ } else {
+ /* some inits don't initialize utmp... */
+ memset(&ut, 0, sizeof(ut));
+ safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
}
- return 0;
+ /*endutent(); */
+
+ strcpy(ut.ut_user, "LOGIN");
+ safe_strncpy(ut.ut_line, line, sizeof(ut.ut_line));
+ if (fakehost)
+ safe_strncpy(ut.ut_host, fakehost, sizeof(ut.ut_host));
+ time(&t);
+ ut.ut_time = t;
+ ut.ut_type = LOGIN_PROCESS;
+ ut.ut_pid = mypid;
+
+ pututline(&ut);
+ endutent();
+
+#ifdef CONFIG_FEATURE_WTMP
+ if (access(bb_path_wtmp_file, R_OK|W_OK) == -1)
+ close(creat(bb_path_wtmp_file, 0664));
+ updwtmp(bb_path_wtmp_file, &ut);
+#endif
}
-/* error - report errors to console or syslog; only understands %s and %m */
+#endif /* CONFIG_FEATURE_UTMP */
+#endif /* SYSV_STYLE */
-#define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2)
-/*
- * output error messages
- */
-static void error(const char *fmt, ...)
+#undef logname
+int getty_main(int argc, char **argv)
{
- va_list va_alist;
- char buf[256], *bp;
+ char *logname = NULL; /* login name, given to /bin/login */
+ struct chardata chardata; /* set by get_logname() */
+ struct termio termio; /* terminal mode bits */
+ static struct options options = {
+ 0, /* show /etc/issue (SYSV_STYLE) */
+ 0, /* no timeout */
+ _PATH_LOGIN, /* default login program */
+ "tty1", /* default tty line */
+ "", /* modem init string */
+#ifdef ISSUE
+ ISSUE, /* default issue file */
+#else
+ NULL,
+#endif
+ 0, /* no baud rates known yet */
+ };
-#ifndef USE_SYSLOG
- int fd;
+#ifdef DEBUGGING
+ dbf = bb_xfopen(DEBUGTERM, "w");
+
+ {
+ int i;
+
+ for (i = 1; i < argc; i++) {
+ debug(argv[i]);
+ debug("\n");
+ }
+ }
#endif
-#ifdef USE_SYSLOG
- buf[0] = '\0';
- bp = buf;
-#else
- strncpy(buf, bb_applet_name, 256);
- strncat(buf, ": ", 256);
- buf[255] = 0;
- bp = buf + strlen(buf);
+ /* Parse command-line arguments. */
+
+ parse_args(argc, argv, &options);
+
+#ifdef __linux__
+ setsid();
#endif
- va_start(va_alist, fmt);
- vsnprintf(bp, 256 - strlen(buf), fmt, va_alist);
- buf[255] = 0;
- va_end(va_alist);
+ /* Update the utmp file. */
-#ifdef USE_SYSLOG
- syslog_msg(LOG_AUTH, LOG_ERR, buf);
-#else
- strncat(bp, "\r\n", 256 - strlen(buf));
- buf[255] = 0;
- if ((fd = open("/dev/console", 1)) >= 0) {
- write(fd, buf, strlen(buf));
- close(fd);
+
+#ifdef SYSV_STYLE
+#ifdef CONFIG_FEATURE_UTMP
+ update_utmp(options.tty);
+#endif
+#endif
+
+ debug("calling open_tty\n");
+ /* Open the tty as standard { input, output, error }. */
+ open_tty(options.tty, &termio, options.flags & F_LOCAL);
+
+#ifdef __linux__
+ {
+ int iv;
+
+ iv = getpid();
+ ioctl(0, TIOCSPGRP, &iv);
}
#endif
- (void) sleep((unsigned) 10); /* be kind to init(8) */
- exit(1);
+ /* Initialize the termio settings (raw mode, eight-bit, blocking i/o). */
+ debug("calling termio_init\n");
+ termio_init(&termio, options.speeds[FIRST_SPEED], &options);
+
+ /* write the modem init string and DON'T flush the buffers */
+ if (options.flags & F_INITSTRING) {
+ debug("writing init string\n");
+ write(1, options.initstring, strlen(options.initstring));
+ }
+
+ if (!(options.flags & F_LOCAL)) {
+ /* go to blocking write mode unless -L is specified */
+ fcntl(1, F_SETFL, fcntl(1, F_GETFL, 0) & ~O_NONBLOCK);
+ }
+
+ /* Optionally detect the baud rate from the modem status message. */
+ debug("before autobaud\n");
+ if (options.flags & F_PARSE)
+ auto_baud(&termio);
+
+ /* Set the optional timer. */
+ if (options.timeout)
+ (void) alarm((unsigned) options.timeout);
+
+ /* optionally wait for CR or LF before writing /etc/issue */
+ if (options.flags & F_WAITCRLF) {
+ char ch;
+
+ debug("waiting for cr-lf\n");
+ while (read(0, &ch, 1) == 1) {
+ ch &= 0x7f; /* strip "parity bit" */
+#ifdef DEBUGGING
+ fprintf(dbf, "read %c\n", ch);
+#endif
+ if (ch == '\n' || ch == '\r')
+ break;
+ }
+ }
+
+ chardata = init_chardata;
+ if (!(options.flags & F_NOPROMPT)) {
+ /* Read the login name. */
+ debug("reading login name\n");
+ /* while ((logname = get_logname(&options, &chardata, &termio)) == 0) */
+ while ((logname = get_logname(&options, &chardata, &termio)) ==
+ NULL) next_speed(&termio, &options);
+ }
+
+ /* Disable timer. */
+
+ if (options.timeout)
+ (void) alarm(0);
+
+ /* Finalize the termio settings. */
+
+ termio_final(&options, &termio, &chardata);
+
+ /* Now the newline character should be properly written. */
+
+ (void) write(1, "\n", 1);
+
+ /* Let the login program take care of password validation. */
+
+ (void) execl(options.login, options.login, "--", logname, (char *) 0);
+ error("%s: can't exec %s: %m", options.tty, options.login);
}
+
projects / oweals / busybox.git / blobdiff