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Diffstat (limited to 'loginutils/getty.c')
| -rw-r--r-- | loginutils/getty.c | 862 |
1 files changed, 862 insertions, 0 deletions
diff --git a/loginutils/getty.c b/loginutils/getty.c new file mode 100644 index 000000000..a85e52306 --- /dev/null +++ b/loginutils/getty.c @@ -0,0 +1,862 @@ +/* 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. + * + * 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 "busybox.h" +#include <syslog.h> + +#if ENABLE_FEATURE_UTMP +#include <utmp.h> +#endif + +/* + * 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 */ +#define SYSV_STYLE /* select System V style getty */ +#include <sys/utsname.h> +#include <time.h> +#if ENABLE_FEATURE_WTMP +extern void updwtmp(const char *filename, const struct utmp *ut); +static void update_utmp(char *line); +#endif +#endif /* LOGIN_PROCESS */ + +/* + * 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 */ +#undef HANDLE_ALLCAPS + +#define _PATH_LOGIN "/bin/login" + +/* 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 */ + +/* 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 */ + +/* 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 */ + +/* + * 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 + +/* Storage for command-line options. */ + +#define MAX_SPEED 10 /* max. nr. of baud rates */ + +struct options { + int flags; /* toggle switches, see below */ + unsigned 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 */ +}; + +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 { + 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 */ +#ifdef HANDLE_ALLCAPS + unsigned char capslock; /* upper case without lower case */ +#endif +}; + +/* 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 +}; + +/* The following is used for understandable diagnostics. */ + +/* Fake hostname for ut_host specified on command line. */ +static char *fakehost = NULL; + +/* ... */ +#ifdef DEBUGGING +#define debug(s) fprintf(dbf,s); fflush(dbf) +#define DEBUGTERM "/dev/ttyp0" +static FILE *dbf; +#else +#define debug(s) /* nothing */ +#endif + + +/* bcode - convert speed string to speed code; return 0 on failure */ +static int bcode(const char *s) +{ + int r; + unsigned value = bb_strtou(s, NULL, 10); + if (errno) { + return -1; + } + r = tty_value_to_baud(value); + if (r > 0) { + return r; + } + return 0; +} + + +/* 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) + bb_error_msg_and_die("bad speed: %s", cp); + if (op->numspeed > MAX_SPEED) + bb_error_msg_and_die("too many alternate speeds"); + } + debug("exiting parsespeeds\n"); +} + + +/* parse_args - parse command-line arguments */ +static void parse_args(int argc, char **argv, struct options *op) +{ + char *ts; + + op->flags = getopt32(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 = 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++; + } + } + *q = '\0'; + } + op->flags ^= F_ISSUE; /* revert flag show /etc/issue */ + if (op->flags & F_TIMEOUT) { + op->timeout = xatoul_range(ts, 1, INT_MAX); + } + argv += optind; + argc -= optind; + debug("after getopt loop\n"); + if (argc < 2) /* check parameter count */ + bb_show_usage(); + + /* we loosen up a bit and accept both "baudrate tty" and "tty baudrate" */ + if ('0' <= argv[0][0] && argv[0][0] <= '9') { + /* a number first, assume it's a speed (BSD style) */ + parse_speeds(op, argv[0]); /* baud rate(s) */ + op->tty = argv[1]; /* tty name */ + } else { + op->tty = argv[0]; /* tty name */ + parse_speeds(op, argv[1]); /* baud rate(s) */ + } + + if (argv[2]) + setenv("TERM", argv[2], 1); + + debug("exiting parseargs\n"); +} + +static void xdup2(int srcfd, int dstfd, const char *tty) +{ + if (dup2(srcfd, dstfd) == -1) + bb_perror_msg_and_die("%s: dup", tty); +} + +/* open_tty - set up tty as standard { input, output, error } */ +static void open_tty(char *tty, struct termios *tp, int local) +{ + 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... */ + + xchdir("/dev"); + chdir_to_root = 1; + xstat(tty, &st); + if ((st.st_mode & S_IFMT) != S_IFCHR) + bb_error_msg_and_die("%s: not a character device", tty); + + /* Open the tty as standard input. */ + + debug("open(2)\n"); + fd = xopen(tty, O_RDWR | O_NONBLOCK); + if (fd) { + xdup2(fd, 0, tty); + close(fd); + } + } 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) + bb_error_msg_and_die("%s: not open for read/write", tty); + } + + /* Replace current standard output/error fd's with new ones */ + debug("duping\n"); + xdup2(0, 1, tty); + xdup2(0, 2, tty); + + /* + * 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, TCGETS, tp) < 0) + bb_perror_msg_and_die("%s: ioctl(TCGETS)", 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 +#warning Debian /dev/vcs[a]NN hack is deprecated and will be removed + { + /* tty to root.dialout 660 */ + struct group *gr; + int id; + + gr = getgrnam("dialout"); + id = gr ? 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; + + vcs = xstrdup(tty); + vcsa = xmalloc(strlen(tty) + 2); + 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); + } + } +#else + chown(tty, 0, 0); /* root, sys */ + chmod(tty, 0622); /* crw--w--w- */ +#endif + if (chdir_to_root) + xchdir("/"); +} + +/* termios_init - initialize termios settings */ +static void termios_init(struct termios *tp, int speed, struct options *op) +{ + /* + * 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 + * later on. + */ +#ifdef __linux__ + /* flush input and output queues, important for modems! */ + ioctl(0, TCFLSH, TCIOFLUSH); +#endif + + tp->c_cflag = CS8 | HUPCL | CREAD | speed; + if (op->flags & F_LOCAL) { + tp->c_cflag |= CLOCAL; + } + + 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 + if (op->flags & F_RTSCTS) + tp->c_cflag |= CRTSCTS; +#endif + + ioctl(0, TCSETS, tp); + + /* go to blocking input even in local mode */ + fcntl(0, F_SETFL, fcntl(0, F_GETFL, 0) & ~O_NONBLOCK); + + debug("term_io 2\n"); +} + +/* auto_baud - extract baud rate from modem status message */ +static void auto_baud(char *buf, unsigned size_buf, struct termios *tp) +{ + int speed; + int vmin; + unsigned iflag; + char *bp; + int nread; + + /* + * This works only if the modem produces its status code AFTER raising + * 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 + * processing (comma-separated list of baud rates) if the processing of + * modem status messages is enabled. + */ + + /* + * Use 7-bit characters, don't block if input queue is empty. Errors will + * be dealt with later on. + */ + + iflag = tp->c_iflag; + tp->c_iflag |= ISTRIP; /* enable 8th-bit stripping */ + vmin = tp->c_cc[VMIN]; + tp->c_cc[VMIN] = 0; /* don't block if queue empty */ + ioctl(0, TCSETS, 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. + */ + + sleep(1); + nread = read(0, buf, size_buf - 1); + if (nread > 0) { + buf[nread] = '\0'; + for (bp = buf; bp < buf + nread; bp++) { + if (isascii(*bp) && isdigit(*bp)) { + speed = bcode(bp); + if (speed) { + tp->c_cflag &= ~CBAUD; + tp->c_cflag |= speed; + } + break; + } + } + } + /* Restore terminal settings. Errors will be dealt with later on. */ + + tp->c_iflag = iflag; + tp->c_cc[VMIN] = vmin; + ioctl(0, TCSETS, tp); +} + +/* next_speed - select next baud rate */ +static void next_speed(struct termios *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]; + ioctl(0, TCSETS, tp); +} + + +/* do_prompt - show login prompt, optionally preceded by /etc/issue contents */ +static void do_prompt(struct options *op, struct termios *tp) +{ +#ifdef ISSUE + print_login_issue(op->issue, op->tty); +#endif + print_login_prompt(); +} + +#ifdef HANDLE_ALLCAPS +/* caps_lock - string contains upper case without lower case */ +/* returns 1 if true, 0 if false */ +static int caps_lock(const char *s) +{ + 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(char *logname, unsigned size_logname, + struct options *op, struct chardata *cp, struct termios *tp) +{ + 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 const char erase[][3] = { /* 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). */ + + *cp = init_chardata; + + /* Flush pending input (esp. after parsing or switching the baud rate). */ + + sleep(1); + ioctl(0, TCFLSH, TCIFLUSH); + + /* Prompt for and read a login name. */ + + logname[0] = '\0'; + while (!logname[0]) { + + /* Write issue file and prompt, with "parity" bit == 0. */ + + do_prompt(op, tp); + + /* Read name, watch for break, parity, erase, kill, end-of-line. */ + + bp = logname; + cp->eol = '\0'; + while (cp->eol == '\0') { + + /* Do not report trivial EINTR/EIO errors. */ + if (read(0, &c, 1) < 1) { + if (errno == EINTR || errno == EIO) + exit(0); + bb_perror_msg_and_die("%s: read", op->tty); + } + + /* Do BREAK handling elsewhere. */ + if (c == '\0' && op->numspeed > 1) + return NULL; + + /* Do parity bit handling. */ + ascval = c & 0177; + if (c != ascval) { /* "parity" bit on ? */ + bits = 1; + mask = 1; + while (mask & 0177) { + if (mask & ascval) + bits++; /* count "1" bits */ + mask <<= 1; + } + /* ... |= 2 - even, 1 - odd */ + cp->parity |= 2 - (bits & 1); + } + + /* 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 */ + break; + case BS: + case DEL: + case '#': + cp->erase = ascval; /* set erase character */ + if (bp > logname) { + write(1, erase[cp->parity], 3); + bp--; + } + break; + case CTL('U'): + case '@': + cp->kill = ascval; /* set kill character */ + while (bp > logname) { + write(1, erase[cp->parity], 3); + bp--; + } + break; + case CTL('D'): + exit(0); + default: + if (!isascii(ascval) || !isprint(ascval)) { + /* ignore garbage characters */ + } else if (bp - logname >= size_logname - 1) { + bb_error_msg_and_die("%s: input overrun", op->tty); + } else { + write(1, &c, 1); /* echo the character */ + *bp++ = ascval; /* and store it */ + } + break; + } + } + } + /* Handle names with upper case and no lower case. */ + +#ifdef HANDLE_ALLCAPS + cp->capslock = caps_lock(logname); + if (cp->capslock) { + for (bp = logname; *bp; bp++) + if (isupper(*bp)) + *bp = tolower(*bp); /* map name to lower case */ + } +#endif + return logname; +} + +/* 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_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[VEOL] = DEF_EOL; + 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_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 */ + break; + case 1: /* odd parity */ + tp->c_cflag |= PARODD; + /* FALLTHROUGH */ + case 2: /* even parity */ + tp->c_cflag |= PARENB; + tp->c_iflag |= INPCK | ISTRIP; + /* FALLTHROUGH */ + case (1 | 2): /* no parity bit */ + tp->c_cflag &= ~CSIZE; + tp->c_cflag |= CS7; + break; + } + /* 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 + if (op->flags & F_RTSCTS) + tp->c_cflag |= CRTSCTS; +#endif + + /* Finally, make the new settings effective */ + + if (ioctl(0, TCSETS, tp) < 0) + bb_perror_msg_and_die("%s: ioctl(TCSETS)", op->tty); +} + + +#ifdef SYSV_STYLE +#if ENABLE_FEATURE_UTMP +/* update_utmp - update our utmp entry */ +static void update_utmp(char *line) +{ + struct utmp ut; + struct utmp *utp; + time_t t; + int mypid = getpid(); + + /* + * 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)); + } + 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)); + safe_strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); + } + /* 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(); + +#if ENABLE_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 +} + +#endif /* CONFIG_FEATURE_UTMP */ +#endif /* SYSV_STYLE */ + + +int getty_main(int argc, char **argv) +{ + int nullfd; + char *logname = NULL; /* 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 = { + 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 */ + }; + + /* Already too late because of theoretical + * possibility of getty --help somehow triggered + * inadvertently before we reach this. Oh well. */ + close(0); + close(1); + close(2); + logmode = LOGMODE_NONE; +#ifdef __linux__ + setsid(); +#endif + /* Was "/dev/console". Why should we spam *system console* + * if there is a problem with getty on /dev/ttyS15?... */ + nullfd = xopen(bb_dev_null, O_RDWR); + if (nullfd) { + dup2(nullfd, 0); + close(nullfd); + } + dup2(0, 1); + dup2(0, 2); + /* We want special flavor of error_msg_and_die */ + die_sleep = 10; + msg_eol = "\r\n"; + openlog(applet_name, LOG_PID, LOG_AUTH); + logmode = LOGMODE_BOTH; + +#ifdef DEBUGGING + dbf = 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 SYSV_STYLE +#if ENABLE_FEATURE_UTMP + /* Update the utmp file. */ + update_utmp(options.tty); +#endif +#endif + + debug("calling open_tty\n"); + /* Open the tty as standard { input, output, error }. */ + open_tty(options.tty, &termios, options.flags & F_LOCAL); + +#ifdef __linux__ + { + int iv; + + iv = getpid(); + ioctl(0, TIOCSPGRP, &iv); + } +#endif + /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */ + debug("calling termios_init\n"); + termios_init(&termios, 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(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), &termios); + + /* Set the optional timer. */ + if (options.timeout) + alarm(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"); + logname = get_logname(bb_common_bufsiz1, sizeof(bb_common_bufsiz1), + &options, &chardata, &termios); + while (logname == NULL) + next_speed(&termios, &options); + } + + /* Disable timer. */ + + if (options.timeout) + alarm(0); + + /* Finalize the termios settings. */ + + termios_final(&options, &termios, &chardata); + + /* Now the newline character should be properly written. */ + + write(1, "\n", 1); + + /* Let the login program take care of password validation. */ + + execl(options.login, options.login, "--", logname, (char *) 0); + bb_error_msg_and_die("%s: can't exec %s", options.tty, options.login); +} |