/* vi: set sw=4 ts=4: */ /* agetty.c - another getty program for Linux. By W. Z. Venema 1989 Ported to Linux by Peter Orbaek 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 - 12/28/95 1999-02-22 Arkadiusz Mi¶kiewicz - added Native Language Support 1999-05-05 Thorsten Kranzkowski - enable hardware flow control before displaying /etc/issue */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "busybox.h" #ifdef CONFIG_FEATURE_UTMP #include #endif #define _PATH_LOGIN "/bin/login" /* If USE_SYSLOG is undefined all diagnostics go directly to /dev/console. */ #ifdef CONFIG_SYSLOGD #include #include #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 */ #ifdef CONFIG_FEATURE_WTMP extern void updwtmp(const char *filename, const struct utmp *ut); #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. */ #ifdef SYSV_STYLE #include #include #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 */ /* 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 */ /* * 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 /* * 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 */ 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 */ }; 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 */ }; /* 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 */ }; #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}, #endif {0, 0}, }; #endif #ifdef SYSV_STYLE #ifdef CONFIG_FEATURE_UTMP static void update_utmp(char *line); #endif #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" FILE *dbf; #else #define debug(s) /* nothing */ #endif /* * output error messages */ static void error(const char *fmt, ...) ATTRIBUTE_NORETURN; static void error(const char *fmt, ...) { va_list va_alist; char buf[256]; #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; 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 va_end(va_alist); (void) sleep((unsigned) 10); /* be kind to init(8) */ exit(1); } /* 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 ((r = tty_value_to_baud(value)) > 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) error("bad speed: %s", cp); if (op->numspeed > MAX_SPEED) error("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 = 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++; } } *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 */ 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"); } /* open_tty - set up tty as standard { input, output, error } */ static void open_tty(char *tty, struct termio *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... */ 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) error("/dev/%s: not a character device", tty); /* Open the tty as standard input. */ close(0); debug("open(2)\n"); fd = open(tty, O_RDWR | O_NONBLOCK, 0); if (fd != 0) error("/dev/%s: cannot open as standard input: %m", tty); } 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); } } #else (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 * reads will be done in raw mode anyway. Errors will be dealt with * lateron. */ #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; } 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 (void) ioctl(0, TCSETA, 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(struct termio *tp) { int speed; int vmin; unsigned iflag; char buf[BUFSIZ]; 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: * * * * 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 lateron. */ 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 */ (void) ioctl(0, TCSETA, 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) { buf[nread] = '\0'; for (bp = buf; bp < buf + nread; bp++) { if (isascii(*bp) && isdigit(*bp)) { if ((speed = bcode(bp))) { tp->c_cflag &= ~CBAUD; tp->c_cflag |= speed; } break; } } } /* Restore terminal settings. Errors will be dealt with lateron. */ tp->c_iflag = iflag; tp->c_cc[VMIN] = vmin; (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 */ print_login_issue(op->issue, op->tty); #endif print_login_prompt(); } /* caps_lock - string contains upper case without lower case */ /* returns 1 if true, 0 if false */ static int caps_lock(const char *s) { int capslock; 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) { 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 */ }; /* Initialize kill, erase, parity etc. (also after switching speeds). */ *cp = init_chardata; /* Flush pending input (esp. after parsing or switching the baud rate). */ (void) sleep(1); (void) ioctl(0, TCFLSH, TCIFLUSH); /* Prompt for and read a login name. */ for (*logname = 0; *logname == 0; /* void */ ) { /* Write issue file and prompt, with "parity" bit == 0. */ do_prompt(op, tp); /* Read name, watch for break, parity, erase, kill, end-of-line. */ for (bp = logname, cp->eol = 0; cp->eol == 0; /* void */ ) { /* Do not report trivial EINTR/EIO errors. */ if (read(0, &c, 1) < 1) { if (errno == EINTR || errno == EIO) exit(0); error("%s: read: %m", op->tty); } /* Do BREAK handling elsewhere. */ if ((c == 0) && op->numspeed > 1) /* return (0); */ 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); } /* 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) { (void) write(1, erase[cp->parity], 3); bp--; } break; case CTL('U'): case '@': cp->kill = ascval; /* set kill character */ while (bp > logname) { (void) 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 >= sizeof(logname) - 1) { error("%s: input overrun", op->tty); } else { (void) write(1, &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))) { for (bp = logname; *bp; bp++) if (isupper(*bp)) *bp = tolower(*bp); /* map name to lower case */ } return (logname); } /* termio_final - set the final tty mode bits */ static void termio_final(struct options *op, struct termio *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. */ if (cp->capslock) { tp->c_iflag |= IUCLC; tp->c_lflag |= XCASE; tp->c_oflag |= OLCUC; } /* 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, TCSETA, tp) < 0) error("%s: ioctl: TCSETA: %m", op->tty); } #ifdef SYSV_STYLE #ifdef CONFIG_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(); #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)); } 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(); #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 } #endif /* CONFIG_FEATURE_UTMP */ #endif /* SYSV_STYLE */ #undef logname 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 = { 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 */ }; #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); #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); }