/* 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
-
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/ioctl.h>
-#include <errno.h>
-#include <sys/stat.h>
-#include <sys/signal.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <ctype.h>
-#include <getopt.h>
-#include <termios.h>
-#include "busybox.h"
-
-#ifdef CONFIG_FEATURE_UTMP
-#include <utmp.h>
-#endif
-
-#define _PATH_LOGIN "/bin/login"
+ * 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 Mickiewicz <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.
+ */
- /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */
-#ifdef CONFIG_SYSLOGD
-#include <sys/param.h>
-#define USE_SYSLOG
+#include "libbb.h"
#include <syslog.h>
-#endif
-
- /*
- * Some heuristics to find out what environment we are in: if it is not
- * System V, assume it is SunOS 4.
- */
+#if ENABLE_FEATURE_UTMP
+#include <utmp.h> /* updwtmp() */
+#endif
-#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);
+#ifndef IUCLC
+# define IUCLC 0
#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 */
+/*
+ * Some heuristics to find out what environment we are in: if it is not
+ * System V, assume it is SunOS 4.
+ */
+#ifdef LOGIN_PROCESS /* defined in System V utmp.h */
#include <sys/utsname.h>
-#include <time.h>
-#endif
+#else /* if !sysV style, wtmp/utmp code is off */
+#undef ENABLE_FEATURE_UTMP
+#undef ENABLE_FEATURE_WTMP
+#define ENABLE_FEATURE_UTMP 0
+#define ENABLE_FEATURE_WTMP 0
+#endif /* LOGIN_PROCESS */
-/* Some shorthands for control characters. */
+/*
+ * 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.
+ */
-#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 */
+/* I doubt there are systems which still need this */
+#undef HANDLE_ALLCAPS
+#undef ANCIENT_BS_KILL_CHARS
-/* Defaults for line-editing etc. characters; you may want to change this. */
+#define _PATH_LOGIN "/bin/login"
-#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,
- * because the termio -> termios translation does not clear the termios
- * 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
+/* 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
+ * wrong baud rate.
+ */
+#define ISSUE "/etc/issue" /* displayed before the login prompt */
- /*
- * 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
-#endif
+/* 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 */
- /*
- * When multiple baud rates are specified on the command line, the first one
- * we will try is the first one specified.
- */
+/* 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 '\n'
+#define DEF_SWITCH 0 /* default switch char */
-#define FIRST_SPEED 0
+/*
+ * When multiple baud rates are specified on the command line, the first one
+ * we will try is the first one specified.
+ */
+#define MAX_SPEED 10 /* max. nr. of baud rates */
/* Storage for command-line options. */
-
-#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 */
+ unsigned timeout; /* time-out period */
+ const char *login; /* login program */
+ const char *tty; /* name of tty */
+ const char *initstring; /* modem init string */
+ const 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! */
-
/* 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 */
-};
-
-/* Initial values for the above. */
-
-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 */
+ unsigned char erase; /* erase character */
+ unsigned char kill; /* kill character */
+ unsigned char eol; /* end-of-line character */
+ unsigned char parity; /* what parity did we see */
+ /* (parity & 1): saw odd parity char with 7th bit set */
+ /* (parity & 2): saw even parity char with 7th bit set */
+ /* parity == 0: probably 7-bit, space parity? */
+ /* parity == 1: probably 7-bit, odd parity? */
+ /* parity == 2: probably 7-bit, even parity? */
+ /* parity == 3: definitely 8 bit, no parity! */
+ /* Hmm... with any value of "parity" 8 bit, no parity is possible */
+#ifdef HANDLE_ALLCAPS
+ unsigned char capslock; /* upper case without lower case */
+#endif
};
-#if 0
-struct Speedtab {
- long speed;
- int code;
-};
-static struct Speedtab speedtab[] = {
- {50, B50},
- {75, B75},
- {110, B110},
- {134, B134},
- {150, B150},
- {200, B200},
- {300, B300},
- {600, B600},
- {1200, B1200},
- {1800, B1800},
- {2400, B2400},
- {4800, B4800},
- {9600, B9600},
-#ifdef B19200
- {19200, B19200},
-#endif
-#ifdef B38400
- {38400, B38400},
-#endif
-#ifdef EXTA
- {19200, EXTA},
-#endif
-#ifdef EXTB
- {38400, EXTB},
-#endif
-#ifdef B57600
- {57600, B57600},
-#endif
-#ifdef B115200
- {115200, B115200},
-#endif
-#ifdef B230400
- {230400, B230400},
+/* Initial values for the above. */
+static const struct chardata init_chardata = {
+ DEF_ERASE, /* default erase character */
+ DEF_KILL, /* default kill character */
+ 13, /* default eol char */
+ 0, /* space parity */
+#ifdef HANDLE_ALLCAPS
+ 0, /* no capslock */
#endif
- {0, 0},
};
-#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(char *s);
-static void error(const char *fmt, ...) __attribute__ ((noreturn));
-
-#ifdef SYSV_STYLE
-#ifdef CONFIG_FEATURE_UTMP
-static void update_utmp(char *line);
-#endif
-#endif
+static const char opt_string[] ALIGN1 = "I:LH:f:hil:mt:wn";
+#define F_INITSTRING (1 << 0) /* -I initstring is set */
+#define F_LOCAL (1 << 1) /* -L force local */
+#define F_FAKEHOST (1 << 2) /* -H fake hostname */
+#define F_CUSTISSUE (1 << 3) /* -f give alternative issue file */
+#define F_RTSCTS (1 << 4) /* -h enable RTS/CTS flow control */
+#define F_ISSUE (1 << 5) /* -i display /etc/issue */
+#define F_LOGIN (1 << 6) /* -l non-default login program */
+#define F_PARSE (1 << 7) /* -m process modem status messages */
+#define F_TIMEOUT (1 << 8) /* -t time out */
+#define F_WAITCRLF (1 << 9) /* -w wait for CR or LF */
+#define F_NOPROMPT (1 << 10) /* -n don't ask for login name */
-/* The following is used for understandable diagnostics. */
-/* Fake hostname for ut_host specified on command line. */
-static char *fakehost = NULL;
+#define line_buf bb_common_bufsiz1
-/* ... */
+/* The following is used for understandable diagnostics. */
#ifdef DEBUGGING
-#define debug(s) fprintf(dbf,s); fflush(dbf)
+static FILE *dbf;
#define DEBUGTERM "/dev/ttyp0"
-FILE *dbf;
-#else
-#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 */
-#ifdef ISSUE
- ISSUE, /* default issue file */
+#define debug(...) do { fprintf(dbf, __VA_ARGS__); fflush(dbf); } while (0)
#else
- NULL,
-#endif
- 0, /* no baud rates known yet */
- };
-
-#ifdef DEBUGGING
- dbf = bb_xfopen(DEBUGTERM, "w");
-
- {
- int i;
-
- for (i = 1; i < argc; i++) {
- debug(argv[i]);
- debug("\n");
- }
- }
-#endif
-
- /* Parse command-line arguments. */
-
- parse_args(argc, argv, &options);
-
-#ifdef __linux__
- setsid();
-#endif
-
- /* Update the utmp file. */
-
-
-#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
- /* 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);
+#define debug(...) ((void)0)
#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);
-}
-/* parse-args - parse command-line arguments */
-static void parse_args(int argc, char **argv, struct options *op)
+/* bcode - convert speed string to speed code; return <= 0 on failure */
+static int bcode(const char *s)
{
- 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';
- }
- 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();
- }
- }
- debug("after getopt loop\n");
- 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 */
- } else {
- op->tty = argv[optind++]; /* tty name */
- parse_speeds(op, argv[optind]); /* baud rate(s) */
- }
-
- optind++;
- if (argc > optind && argv[optind])
- setenv("TERM", argv[optind], 1);
-
- debug("exiting parseargs\n");
+ int value = bb_strtou(s, NULL, 10); /* yes, int is intended! */
+ if (value < 0) /* bad terminating char, overflow, etc */
+ return value;
+ return tty_value_to_baud(value);
}
/* parse_speeds - parse alternate baud rates */
-
static void parse_speeds(struct options *op, char *arg)
{
char *cp;
+ /* NB: at least one iteration is always done */
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);
+ while ((cp = strsep(&arg, ",")) != NULL) {
+ op->speeds[op->numspeed] = bcode(cp);
+ if (op->speeds[op->numspeed] < 0)
+ bb_error_msg_and_die("bad speed: %s", cp);
+ /* note: arg "0" turns into speed B0 */
+ op->numspeed++;
if (op->numspeed > MAX_SPEED)
- error("too many alternate speeds");
+ bb_error_msg_and_die("too many alternate speeds");
}
- debug("exiting parsespeeds\n");
+ debug("exiting parse_speeds\n");
}
-#ifdef SYSV_STYLE
-#ifdef CONFIG_FEATURE_UTMP
-
-/* update_utmp - update our utmp entry */
-static void update_utmp(char *line)
+/* parse_args - parse command-line arguments */
+static void parse_args(char **argv, struct options *op, char **fakehost_p)
{
- 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.
- */
- if (access(_PATH_UTMP, R_OK|W_OK) == -1) {
- close(creat(_PATH_UTMP, 0664));
+ char *ts;
+
+ opt_complementary = "-2:t+"; /* at least 2 args; -t N */
+ op->flags = getopt32(argv, opt_string,
+ &(op->initstring), fakehost_p, &(op->issue),
+ &(op->login), &op->timeout);
+ argv += optind;
+ if (op->flags & F_INITSTRING) {
+ const char *p = op->initstring;
+ char *q;
+
+ op->initstring = q = xstrdup(p);
+ /* 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++;
+ }
+ }
+ *q = '\0';
}
- utmpname(_PATH_UTMP);
- setutent();
- while ((utp = getutent())
- && !(utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid)) /* nothing */
- ;
+ op->flags ^= F_ISSUE; /* invert flag "show /etc/issue" */
+ debug("after getopt\n");
- 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));
+ /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */
+ op->tty = argv[0]; /* tty name */
+ ts = argv[1]; /* baud rate(s) */
+ if (isdigit(argv[0][0])) {
+ /* a number first, assume it's a speed (BSD style) */
+ op->tty = ts; /* tty name is in argv[1] */
+ ts = argv[0]; /* baud rate(s) */
}
- /*endutent(); */
+ parse_speeds(op, ts);
- 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;
+// TODO: if applet_name is set to "getty: TTY", bb_error_msg's get simpler!
+// grep for "%s:"
- pututline(&ut);
- endutent();
+ if (argv[2])
+ xsetenv("TERM", argv[2]);
-#ifdef CONFIG_FEATURE_WTMP
- if (access(_PATH_WTMP, R_OK|W_OK) == -1)
- close(creat(_PATH_WTMP, 0664));
- updwtmp(_PATH_WTMP, &ut);
-#endif
+ debug("exiting parse_args\n");
}
-#endif /* CONFIG_FEATURE_UTMP */
-#endif /* SYSV_STYLE */
-
/* 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(const char *tty)
{
/* Set up new standard input, unless we are given an already opened port. */
-
- if (strcmp(tty, "-")) {
- struct stat st;
- int fd;
+ if (NOT_LONE_DASH(tty)) {
+// struct stat st;
+// int cur_dir_fd;
+// int fd;
/* Sanity checks... */
+// cur_dir_fd = xopen(".", O_DIRECTORY | O_NONBLOCK);
+// xchdir("/dev");
+// xstat(tty, &st);
+// if (!S_ISCHR(st.st_mode))
+// bb_error_msg_and_die("%s: not a character device", tty);
- if (chdir("/dev"))
- error("/dev: chdir() failed: %m");
- if (stat(tty, &st) < 0)
- error("/dev/%s: %m", tty);
- if ((st.st_mode & S_IFMT) != S_IFCHR)
- error("/dev/%s: not a character device", tty);
+ if (tty[0] != '/')
+ tty = xasprintf("/dev/%s", tty); /* will leak it */
/* Open the tty as standard input. */
-
debug("open(2)\n");
- fd = open(tty, O_RDWR | O_NONBLOCK, 0);
- if (dup2(fd, STDIN_FILENO) == -1)
- error("/dev/%s: cannot open as standard input: %m", tty);
- close(fd);
+ close(0);
+ /*fd =*/ xopen(tty, O_RDWR | O_NONBLOCK); /* uses fd 0 */
- } else {
+// /* Restore current directory */
+// fchdir(cur_dir_fd);
+ /* Open the tty as standard input, continued */
+// xmove_fd(fd, 0);
+// /* fd is >= cur_dir_fd, and cur_dir_fd gets closed too here: */
+// while (fd > 2)
+// close(fd--);
+
+ /* Set proper protections and ownership. */
+ fchown(0, 0, 0); /* 0:0 */
+ fchmod(0, 0620); /* crw--w---- */
+ } else {
/*
* Standard input should already be connected to an open port. Make
* sure it is open for read/write.
*/
-
- if ((fcntl(0, F_GETFL, 0) & O_RDWR) != O_RDWR)
- error("%s: not open for read/write", tty);
- }
-
- /* Replace current standard output/error fd's with new ones */
- debug("duping\n");
- 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
- * there is noise on the modem control lines. In the latter case, the
- * common course of action is (1) fix your cables (2) give the modem more
- * time to properly reset after hanging up. SunOS users can achieve (2)
- * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
- * 5 seconds seems to be a good value.
- */
-
- if (ioctl(0, TCGETA, tp) < 0)
- error("%s: ioctl: %m", tty);
-
- /*
- * It seems to be a terminal. Set proper protections and ownership. Mode
- * 0622 is suitable for SYSV <4 because /bin/login does not change
- * protections. SunOS 4 login will change the protections to 0620 (write
- * access for group tty) after the login has succeeded.
- */
-
-#ifdef DEBIAN
- {
- /* tty to root.dialout 660 */
- struct group *gr;
- int id;
-
- id = (gr = getgrnam("dialout")) ? gr->gr_gid : 0;
- chown(tty, 0, id);
- chmod(tty, 0660);
-
- /* vcs,vcsa to root.sys 600 */
- if (!strncmp(tty, "tty", 3) && isdigit(tty[3])) {
- char *vcs, *vcsa;
-
- if (!(vcs = strdup(tty)))
- error("Can't malloc for vcs");
- if (!(vcsa = malloc(strlen(tty) + 2)))
- error("Can't malloc for vcsa");
- strcpy(vcs, "vcs");
- strcpy(vcs + 3, tty + 3);
- strcpy(vcsa, "vcsa");
- strcpy(vcsa + 4, tty + 3);
-
- id = (gr = getgrnam("sys")) ? gr->gr_gid : 0;
- chown(vcs, 0, id);
- chmod(vcs, 0600);
- chown(vcsa, 0, id);
- chmod(vcs, 0600);
-
- free(vcs);
- free(vcsa);
- }
+ if ((fcntl(0, F_GETFL) & O_RDWR) != O_RDWR)
+ bb_error_msg_and_die("stdin is not open for read/write");
}
-#else
- (void) chown(tty, 0, 0); /* root, sys */
- (void) chmod(tty, 0622); /* crw--w--w- */
- errno = 0; /* ignore above errors */
-#endif
}
-/* termio_init - initialize termio settings */
-
-static void termio_init(struct termio *tp, int speed, struct options *op)
+/* termios_init - initialize termios settings */
+static void termios_init(struct termios *tp, int speed, struct options *op)
{
-
+ speed_t ispeed, ospeed;
/*
- * 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
* reads will be done in raw mode anyway. Errors will be dealt with
- * lateron.
+ * later on.
*/
#ifdef __linux__
/* flush input and output queues, important for modems! */
- (void) ioctl(0, TCFLSH, TCIOFLUSH);
-#endif
-
- tp->c_cflag = CS8 | HUPCL | CREAD | speed;
- if (op->flags & F_LOCAL) {
- tp->c_cflag |= CLOCAL;
+ ioctl(0, TCFLSH, TCIOFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
+#endif
+ ispeed = ospeed = speed;
+ if (speed == B0) {
+ /* Speed was specified as "0" on command line.
+ * Just leave it unchanged */
+ ispeed = cfgetispeed(tp);
+ ospeed = cfgetospeed(tp);
}
+ tp->c_cflag = CS8 | HUPCL | CREAD;
+ if (op->flags & F_LOCAL)
+ tp->c_cflag |= CLOCAL;
+ cfsetispeed(tp, ispeed);
+ cfsetospeed(tp, ospeed);
- tp->c_iflag = tp->c_lflag = tp->c_oflag = tp->c_line = 0;
+ tp->c_iflag = tp->c_lflag = tp->c_line = 0;
+ tp->c_oflag = OPOST | ONLCR;
tp->c_cc[VMIN] = 1;
tp->c_cc[VTIME] = 0;
/* Optionally enable hardware flow control */
-
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
- (void) ioctl(0, TCSETA, tp);
-
- /* go to blocking input even in local mode */
- fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK);
+ tcsetattr_stdin_TCSANOW(tp);
debug("term_io 2\n");
}
/* auto_baud - extract baud rate from modem status message */
-static void auto_baud(struct termio *tp)
+static void auto_baud(char *buf, unsigned size_buf, struct termios *tp)
{
int speed;
int vmin;
unsigned iflag;
- char buf[BUFSIZ];
char *bp;
int nread;
/*
* Use 7-bit characters, don't block if input queue is empty. Errors will
- * be dealt with lateron.
+ * be dealt with later on.
*/
-
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 */
- (void) ioctl(0, TCSETA, tp);
+ tp->c_cc[VMIN] = 0; /* don't block if queue empty */
+ tcsetattr_stdin_TCSANOW(tp);
/*
* Wait for a while, then read everything the modem has said so far and
* try to extract the speed of the dial-in call.
*/
-
- (void) sleep(1);
- if ((nread = read(0, buf, sizeof(buf) - 1)) > 0) {
+ sleep(1);
+ nread = safe_read(STDIN_FILENO, buf, size_buf - 1);
+ if (nread > 0) {
buf[nread] = '\0';
for (bp = buf; bp < buf + nread; bp++) {
- if (isascii(*bp) && isdigit(*bp)) {
- if ((speed = bcode(bp))) {
+ if (isdigit(*bp)) {
+ speed = bcode(bp);
+ if (speed > 0) {
tp->c_cflag &= ~CBAUD;
tp->c_cflag |= speed;
}
}
}
}
- /* Restore terminal settings. Errors will be dealt with lateron. */
+ /* Restore terminal settings. Errors will be dealt with later on. */
tp->c_iflag = iflag;
tp->c_cc[VMIN] = vmin;
- (void) ioctl(0, TCSETA, tp);
+ tcsetattr_stdin_TCSANOW(tp);
}
/* 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)
{
-#ifdef ISSUE /* optional: show /etc/issue */
+#ifdef 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)
+#ifdef HANDLE_ALLCAPS
+/* all_is_upcase - string contains upper case without lower case */
+/* returns 1 if true, 0 if false */
+static int all_is_upcase(const char *s)
{
- 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);
+ while (*s)
+ if (islower(*s++))
+ return 0;
+ return 1;
}
+#endif
-/* 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)
+/* get_logname - get user name, establish parity, speed, erase, kill, eol;
+ * return NULL on BREAK, logname on success */
+static char *get_logname(char *logname, unsigned size_logname,
+ struct options *op, struct chardata *cp)
{
- 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 const char erase[][3] = {/* backspace-space-backspace */
+ "\010\040\010", /* space parity */
+ "\010\040\010", /* odd parity */
+ "\210\240\210", /* even parity */
+ "\010\040\010", /* 8 bit no parity */
};
- /* Initialize kill, erase, parity etc. (also after switching speeds). */
-
- *cp = init_chardata;
+ /* NB: *cp is pre-initialized with init_chardata */
/* Flush pending input (esp. after parsing or switching the baud rate). */
-
- (void) sleep(1);
- (void) ioctl(0, TCFLSH, TCIFLUSH);
+ sleep(1);
+ ioctl(0, TCFLSH, TCIFLUSH); /* tcflush(0, TCIOFLUSH)? - same */
/* Prompt for and read a login name. */
-
- for (*logname = 0; *logname == 0; /* void */ ) {
-
+ logname[0] = '\0';
+ while (!logname[0]) {
/* Write issue file and prompt, with "parity" bit == 0. */
-
- do_prompt(op, tp);
+ do_prompt(op);
/* Read name, watch for break, parity, erase, kill, end-of-line. */
-
- for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) {
+ bp = logname;
+ cp->eol = '\0';
+ while (cp->eol == '\0') {
/* Do not report trivial EINTR/EIO errors. */
-
- if (read(0, &c, 1) < 1) {
+ if (read(STDIN_FILENO, &c, 1) < 1) {
if (errno == EINTR || errno == EIO)
- exit(0);
- error("%s: read: %m", op->tty);
+ exit(EXIT_SUCCESS);
+ bb_perror_msg_and_die("%s: read", op->tty);
}
- /* Do BREAK handling elsewhere. */
- if ((c == 0) && op->numspeed > 1)
- /* return (0); */
+ /* BREAK. If we have speeds to try,
+ * return NULL (will switch speeds and return here) */
+ if (c == '\0' && op->numspeed > 1)
return NULL;
/* Do parity bit handling. */
-
- if (c != (ascval = (c & 0177))) { /* "parity" bit on ? */
- for (bits = 1, mask = 1; mask & 0177; mask <<= 1)
- if (mask & ascval)
- bits++; /* count "1" bits */
- cp->parity |= ((bits & 1) ? 1 : 2);
+ if (!(op->flags & F_LOCAL) && (c & 0x80)) { /* "parity" bit on? */
+ bits = 1;
+ mask = 1;
+ while (mask & 0x7f) {
+ if (mask & c)
+ bits++; /* count "1" bits */
+ mask <<= 1;
+ }
+ /* ... |= 2 - even, 1 - odd */
+ cp->parity |= 2 - (bits & 1);
}
- /* Do erase, kill and end-of-line processing. */
+ /* Do erase, kill and end-of-line processing. */
+ ascval = c & 0x7f;
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:
+#ifdef ANCIENT_BS_KILL_CHARS
case '#':
- cp->erase = ascval; /* set erase character */
+#endif
+ cp->erase = ascval; /* set erase character */
if (bp > logname) {
- (void) write(1, erase[cp->parity], 3);
+ full_write(STDOUT_FILENO, erase[cp->parity], 3);
bp--;
}
break;
case CTL('U'):
+#ifdef ANCIENT_BS_KILL_CHARS
case '@':
- cp->kill = ascval; /* set kill character */
+#endif
+ cp->kill = ascval; /* set kill character */
while (bp > logname) {
- (void) write(1, erase[cp->parity], 3);
+ full_write(STDOUT_FILENO, erase[cp->parity], 3);
bp--;
}
break;
case CTL('D'):
- exit(0);
+ exit(EXIT_SUCCESS);
default:
- if (!isascii(ascval) || !isprint(ascval)) {
- /* ignore garbage characters */ ;
- } else if (bp - logname >= sizeof(logname) - 1) {
- error("%s: input overrun", op->tty);
+ if (!isprint(ascval)) {
+ /* ignore garbage characters */
+ } else if ((int)(bp - logname) >= size_logname - 1) {
+ bb_error_msg_and_die("%s: input overrun", op->tty);
} else {
- (void) write(1, &c, 1); /* echo the character */
- *bp++ = ascval; /* and store it */
+ full_write(STDOUT_FILENO, &c, 1); /* echo the character */
+ *bp++ = ascval; /* and store it */
}
break;
}
}
/* Handle names with upper case and no lower case. */
- if ((cp->capslock = caps_lock(logname))) {
+#ifdef HANDLE_ALLCAPS
+ cp->capslock = all_is_upcase(logname);
+ if (cp->capslock) {
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);
+#endif
+ return logname;
}
-/* termio_final - set the final tty mode bits */
-static void termio_final(struct options *op, struct termio *tp, struct chardata *cp)
+/* termios_final - set the final tty mode bits */
+static void termios_final(struct options *op, struct termios *tp, struct chardata *cp)
{
/* 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 */
+// I bet most people go here - they use only 7-bit chars in usernames....
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;
+// FIXME: wtf? case 3: we saw both even and odd 8-bit bytes -
+// it's probably some umlauts etc, but definitely NOT 7-bit!!!
+// Entire parity detection madness here just begs for deletion...
break;
}
- /* Account for upper case without lower case. */
+ /* Account for upper case without lower case. */
+#ifdef HANDLE_ALLCAPS
if (cp->capslock) {
tp->c_iflag |= IUCLC;
tp->c_lflag |= XCASE;
tp->c_oflag |= OLCUC;
}
+#endif
/* Optionally enable hardware flow control */
-
-#ifdef CRTSCTS
+#ifdef CRTSCTS
if (op->flags & F_RTSCTS)
tp->c_cflag |= CRTSCTS;
#endif
/* Finally, make the new settings effective */
+ /* It's tcsetattr_stdin_TCSANOW() + error check */
+ ioctl_or_perror_and_die(0, TCSETS, tp, "%s: TCSETS", op->tty);
+}
- if (ioctl(0, TCSETA, tp) < 0)
- error("%s: ioctl: TCSETA: %m", op->tty);
+#if ENABLE_FEATURE_UTMP
+static void touch(const char *filename)
+{
+ if (access(filename, R_OK | W_OK) == -1)
+ close(open(filename, O_WRONLY | O_CREAT, 0664));
}
-/* caps_lock - string contains upper case without lower case */
-/* returns 1 if true, 0 if false */
-static int caps_lock(const char *s)
+/* update_utmp - update our utmp entry */
+static NOINLINE void update_utmp(const char *line, char *fakehost)
{
- int capslock;
+ struct utmp ut;
+ struct utmp *utp;
+ int mypid = getpid();
+
+ /* In case we won't find an entry below... */
+ memset(&ut, 0, sizeof(ut));
+ safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id));
+
+ /*
+ * 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.
+ */
+ touch(_PATH_UTMP);
- for (capslock = 0; *s; s++) {
- if (islower(*s))
- return (0);
- if (capslock == 0)
- capslock = isupper(*s);
+ utmpname(_PATH_UTMP);
+ setutent();
+ while ((utp = getutent()) != NULL) {
+ if (utp->ut_type == INIT_PROCESS && utp->ut_pid == mypid) {
+ memcpy(&ut, utp, sizeof(ut));
+ break;
+ }
}
- return (capslock);
+
+ 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));
+ ut.ut_tv.tv_sec = time(NULL);
+ ut.ut_type = LOGIN_PROCESS;
+ ut.ut_pid = mypid;
+
+ pututline(&ut);
+ endutent();
+
+#if ENABLE_FEATURE_WTMP
+ touch(bb_path_wtmp_file);
+ updwtmp(bb_path_wtmp_file, &ut);
+#endif
}
+#endif /* CONFIG_FEATURE_UTMP */
-/* bcode - convert speed string to speed code; return 0 on failure */
-static int bcode(char *s)
+int getty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int getty_main(int argc UNUSED_PARAM, char **argv)
{
- int r;
- unsigned long value;
- if (safe_strtoul(s, &value)) {
- return -1;
- }
- if ((r = bb_value_to_baud(value)) > 0) {
- return r;
- }
- return 0;
-}
+ int n;
+ char *fakehost = NULL; /* Fake hostname for ut_host */
+ char *logname; /* login name, given to /bin/login */
+ /* Merging these into "struct local" may _seem_ to reduce
+ * 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 termios termios; /* terminal mode bits */
+ struct options options;
-/* error - report errors to console or syslog; only understands %s and %m */
+ chardata = init_chardata;
-#define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2)
+ memset(&options, 0, sizeof(options));
+ options.login = _PATH_LOGIN; /* default login program */
+ options.tty = "tty1"; /* default tty line */
+ options.initstring = ""; /* modem init string */
+#ifdef ISSUE
+ options.issue = ISSUE; /* default issue file */
+#endif
-/*
- * output error messages
- */
-static void error(const char *fmt, ...)
-{
- va_list va_alist;
- char buf[256], *bp;
+ /* Parse command-line arguments. */
+ parse_args(argv, &options, &fakehost);
-#ifndef USE_SYSLOG
- int fd;
+ logmode = LOGMODE_NONE;
+
+ /* Create new session, lose controlling tty, if any */
+ /* docs/ctty.htm says:
+ * "This is allowed only when the current process
+ * is not a process group leader" - is this a problem? */
+ setsid();
+ /* close stdio, and stray descriptors, just in case */
+ n = xopen(bb_dev_null, O_RDWR);
+ /* dup2(n, 0); - no, we need to handle "getty - 9600" too */
+ xdup2(n, 1);
+ xdup2(n, 2);
+ while (n > 2)
+ close(n--);
+
+ /* Logging. We want special flavor of error_msg_and_die */
+ die_sleep = 10;
+ msg_eol = "\r\n";
+ /* most likely will internally use fd #3 in CLOEXEC mode: */
+ openlog(applet_name, LOG_PID, LOG_AUTH);
+ logmode = LOGMODE_BOTH;
+
+#ifdef DEBUGGING
+ dbf = xfopen_for_write(DEBUGTERM);
+ for (n = 1; argv[n]; n++) {
+ debug(argv[n]);
+ 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);
+ /* Open the tty as standard input, if it is not "-" */
+ /* If it's not "-" and not taken yet, it will become our ctty */
+ debug("calling open_tty\n");
+ open_tty(options.tty);
+ ndelay_off(0);
+ debug("duping\n");
+ xdup2(0, 1);
+ xdup2(0, 2);
+
+ /*
+ * The following ioctl will fail if stdin is not a tty, but also when
+ * there is noise on the modem control lines. In the latter case, the
+ * common course of action is (1) fix your cables (2) give the modem more
+ * time to properly reset after hanging up. SunOS users can achieve (2)
+ * by patching the SunOS kernel variable "zsadtrlow" to a larger value;
+ * 5 seconds seems to be a good value.
+ */
+ /* tcgetattr() + error check */
+ ioctl_or_perror_and_die(0, TCGETS, &termios, "%s: TCGETS", options.tty);
+
+#ifdef __linux__
+// FIXME: do we need this? Otherwise "-" case seems to be broken...
+ // /* Forcibly make fd 0 our controlling tty, even if another session
+ // * has it as a ctty. (Another session loses ctty). */
+ // ioctl(0, TIOCSCTTY, (void*)1);
+ /* Make ourself a foreground process group within our session */
+ tcsetpgrp(0, getpid());
+#endif
+
+#if ENABLE_FEATURE_UTMP
+ /* Update the utmp file. This tty is ours now! */
+ update_utmp(options.tty, fakehost);
#endif
- va_start(va_alist, fmt);
- vsnprintf(bp, 256 - strlen(buf), fmt, va_alist);
- buf[255] = 0;
- va_end(va_alist);
+ /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */
+ debug("calling termios_init\n");
+ termios_init(&termios, options.speeds[0], &options);
-#ifdef USE_SYSLOG
- openlog(bb_applet_name, 0, LOG_AUTH);
- syslog(LOG_ERR, "%s", buf);
- closelog();
-#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);
+ /* Write the modem init string and DON'T flush the buffers */
+ if (options.flags & F_INITSTRING) {
+ debug("writing init string\n");
+ /* todo: use xwrite_str? */
+ full_write(STDOUT_FILENO, options.initstring, strlen(options.initstring));
}
-#endif
- (void) sleep((unsigned) 10); /* be kind to init(8) */
- exit(1);
+
+ /* Optionally detect the baud rate from the modem status message */
+ debug("before autobaud\n");
+ if (options.flags & F_PARSE)
+ auto_baud(line_buf, sizeof(line_buf), &termios);
+
+ /* Set the optional timer */
+ alarm(options.timeout); /* if 0, alarm is not set */
+
+ /* Optionally wait for CR or LF before writing /etc/issue */
+ if (options.flags & F_WAITCRLF) {
+ char ch;
+
+ debug("waiting for cr-lf\n");
+ while (safe_read(STDIN_FILENO, &ch, 1) == 1) {
+ debug("read %x\n", (unsigned char)ch);
+ ch &= 0x7f; /* strip "parity bit" */
+ if (ch == '\n' || ch == '\r')
+ break;
+ }
+ }
+
+ logname = NULL;
+ if (!(options.flags & F_NOPROMPT)) {
+ /* NB:termios_init already set line speed
+ * to options.speeds[0] */
+ int baud_index = 0;
+
+ while (1) {
+ /* Read the login name. */
+ debug("reading login name\n");
+ logname = get_logname(line_buf, sizeof(line_buf),
+ &options, &chardata);
+ if (logname)
+ break;
+ /* we are here only if options.numspeed > 1 */
+ baud_index = (baud_index + 1) % options.numspeed;
+ cfsetispeed(&termios, options.speeds[baud_index]);
+ cfsetospeed(&termios, options.speeds[baud_index]);
+ tcsetattr_stdin_TCSANOW(&termios);
+ }
+ }
+
+ /* Disable timer. */
+ alarm(0);
+
+ /* Finalize the termios settings. */
+ termios_final(&options, &termios, &chardata);
+
+ /* Now the newline character should be properly written. */
+ full_write(STDOUT_FILENO, "\n", 1);
+
+ /* Let the login program take care of password validation. */
+ /* We use PATH because we trust that root doesn't set "bad" PATH,
+ * and getty is not suid-root applet. */
+ /* With -n, logname == NULL, and login will ask for username instead */
+ BB_EXECLP(options.login, options.login, "--", logname, NULL);
+ bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login);
}
projects / oweals / busybox.git / blobdiff