/* * Alternate Getty (agetty) 'agetty' is a versatile, portable, easy to use * replacement for getty on SunOS 4.1.x or the SAC ttymon/ttyadm/sacadm/pmadm * suite on Solaris and other SVR4 systems. 'agetty' was written by Wietse * Venema, enhanced by John DiMarco, and further enhanced by Dennis Cronin. * * Ported to Linux by Peter Orbaek * * This program is freely distributable. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "strutils.h" #include "nls.h" #include "pathnames.h" #include "c.h" #include "xalloc.h" #ifdef __linux__ # include # define USE_SYSLOG #endif /* If USE_SYSLOG is undefined all diagnostics go to /dev/console. */ #ifdef USE_SYSLOG # include #endif /* * Some heuristics to find out what environment we are in: if it is not * System V, assume it is SunOS 4. The LOGIN_PROCESS is defined in System V * utmp.h, which will select System V style getty. */ #ifdef LOGIN_PROCESS # define SYSV_STYLE #endif /* * 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. */ /* Displayed before the login prompt. */ #ifdef SYSV_STYLE # define ISSUE _PATH_ISSUE # include #endif /* Login prompt. */ #define LOGIN " login: " /* 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 these. */ #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 */ #ifndef MAXHOSTNAMELEN # ifdef HOST_NAME_MAX # define MAXHOSTNAMELEN HOST_NAME_MAX # else # define MAXHOSTNAMELEN 64 # endif /* HOST_NAME_MAX */ #endif /* MAXHOSTNAMELEN */ /* * 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 */ speed_t 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) /* do not ask for login name! */ #define F_LCUC (1<<8) /* support for *LCUC stty modes */ #define F_KEEPSPEED (1<<9) /* follow baud rate from kernel */ #define F_KEEPCFLAGS (1<<10) /* reuse c_cflags setup from kernel */ #define F_EIGHTBITS (1<<11) /* Assume 8bit-clean tty */ /* 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. */ struct chardata init_chardata = { DEF_ERASE, /* default erase character */ DEF_KILL, /* default kill character */ 13, /* default eol char */ 0, /* space parity */ 0, /* no capslock */ }; struct Speedtab { long speed; speed_t 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}, }; static void parse_args(int argc, char **argv, struct options *op); static void parse_speeds(struct options *op, char *arg); static void update_utmp(char *line); static void open_tty(char *tty, struct termios *tp, int local); static void termio_init(struct options *op, struct termios *tp); static void auto_baud(struct termios *tp); static void do_prompt(struct options *op, struct termios *tp); static void next_speed(struct options *op, struct termios *tp); static char *get_logname(struct options *op, struct termios *tp, struct chardata *cp); static void termio_final(struct options *op, struct termios *tp, struct chardata *cp); static int caps_lock(char *s); static speed_t bcode(char *s); static void usage(FILE * out) __attribute__((__noreturn__)); static void log_err(const char *, ...) __attribute__((__noreturn__)) __attribute__((__format__(printf, 1, 2))); static void log_warn (const char *, ...) __attribute__((__format__(printf, 1, 2))); /* Fake hostname for ut_host specified on command line. */ static char *fakehost; #ifdef DEBUGGING #define debug(s) fprintf(dbf,s); fflush(dbf) FILE *dbf; #else #define debug(s) #endif /* DEBUGGING */ int main(int argc, char **argv) { char *logname = NULL; /* login name, given to /bin/login */ struct chardata chardata; /* will be set by get_logname() */ struct termios termios; /* 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 */ { 0 } }; setlocale(LC_ALL, ""); bindtextdomain(PACKAGE, LOCALEDIR); textdomain(PACKAGE); #ifdef DEBUGGING dbf = fopen("/dev/ttyp0", "w"); for (int i = 1; i < argc; i++) debug(argv[i]); #endif /* DEBUGGING */ /* Parse command-line arguments. */ parse_args(argc, argv, &options); #ifdef __linux__ setsid(); #endif /* Update the utmp file. */ #ifdef SYSV_STYLE update_utmp(options.tty); #endif debug("calling open_tty\n"); /* Open the tty as standard { input, output, error }. */ open_tty(options.tty, &termios, options.flags & F_LOCAL); tcsetpgrp(STDIN_FILENO, getpid()); /* Initialize the termios settings (raw mode, eight-bit, blocking i/o). */ debug("calling termio_init\n"); termio_init(&options, &termios); /* Write the modem init string and DO NOT flush the buffers. */ if (options.flags & F_INITSTRING) { debug("writing init string\n"); ignore_result(write (STDIN_FILENO, options.initstring, strlen(options.initstring))); } if (!(options.flags & F_LOCAL)) /* Go to blocking write mode unless -L is specified. */ fcntl(STDOUT_FILENO, F_SETFL, fcntl(STDOUT_FILENO, 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(&termios); /* Set the optional timer. */ if (options.timeout) 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(STDIN_FILENO, &ch, 1) == 1) { /* Strip "parity bit". */ ch &= 0x7f; #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, &termios, &chardata)) == 0) next_speed(&options, &termios); } /* Disable timer. */ if (options.timeout) alarm(0); /* Finalize the termios settings. */ termio_final(&options, &termios, &chardata); /* Now the newline character should be properly written. */ ignore_result(write(STDOUT_FILENO, "\n", 1)); /* Let the login program take care of password validation. */ execl(options.login, options.login, "--", logname, NULL); log_err(_("%s: can't exec %s: %m"), options.tty, options.login); } /* Parse command-line arguments. */ static void parse_args(int argc, char **argv, struct options *op) { extern char *optarg; extern int optind; int c; enum { VERSION_OPTION = CHAR_MAX + 1, HELP_OPTION }; static const struct option longopts[] = { { "8bits", no_argument, 0, '8' }, { "noreset", no_argument, 0, 'c' }, { "issue-file", required_argument, 0, 'f' }, { "flow-control", no_argument, 0, 'h' }, { "host", required_argument, 0, 'H' }, { "noissue", no_argument, 0, 'i' }, { "init-string", required_argument, 0, 'I' }, { "login-program", required_argument, 0, 'l' }, { "local-line", no_argument, 0, 'L' }, { "extract-baud", no_argument, 0, 'm' }, { "skip-login", no_argument, 0, 'n' }, { "keep-baud", no_argument, 0, 's' }, { "timeout", required_argument, 0, 't' }, { "detect-case", no_argument, 0, 'U' }, { "wait-cr", no_argument, 0, 'w' }, { "version", no_argument, 0, VERSION_OPTION }, { "help", no_argument, 0, HELP_OPTION }, { NULL, 0, 0, 0 } }; while ((c = getopt_long(argc, argv, "8cf:hH:iI:l:Lmnst:Uw", longopts, NULL)) != -1) { switch (c) { case '8': op->flags |= F_EIGHTBITS; break; case 'c': op->flags |= F_KEEPCFLAGS; break; case 'f': op->flags |= F_CUSTISSUE; op->issue = optarg; break; case 'h': op->flags |= F_RTSCTS; break; case 'H': fakehost = optarg; break; case 'i': op->flags &= ~F_ISSUE; break; case 'I': /* * FIXME: It would be better to use a separate * function for this task. */ { char ch, *p, *q; int i; op->initstring = xmalloc(strlen(optarg) + 1); /* * Copy optarg into op->initstring decoding \ddd octal * codes into chars. */ q = op->initstring; p = optarg; while (*p) { /* The \\ is converted to \ */ if (*p == '\\') { p++; if (*p == '\\') { ch = '\\'; p++; } else { /* Handle \000 - \177. */ ch = 0; for (i = 1; i <= 3; i++) { if (*p >= '0' && *p <= '7') { ch <<= 3; ch += *p - '0'; p++; } else { break; } } } *q++ = ch; } else *q++ = *p++; } *q = '\0'; op->flags |= F_INITSTRING; break; } case 'l': op->login = optarg; break; case 'L': op->flags |= F_LOCAL; break; case 'm': op->flags |= F_PARSE; break; case 'n': op->flags |= F_NOPROMPT; break; case 's': op->flags |= F_KEEPSPEED; break; case 't': if ((op->timeout = atoi(optarg)) <= 0) log_err(_("bad timeout value: %s"), optarg); break; case 'U': op->flags |= F_LCUC; break; case 'w': op->flags |= F_WAITCRLF; break; case VERSION_OPTION: printf(_("%s from %s\n"), program_invocation_short_name, PACKAGE_STRING); exit(EXIT_SUCCESS); case HELP_OPTION: usage(stdout); default: usage(stderr); } } debug("after getopt loop\n"); if (argc < optind + 2) { log_warn(_("not enough arguments")); usage(stderr); } /* Accept both "baudrate tty" and "tty baudrate". */ if ('0' <= argv[optind][0] && argv[optind][0] <= '9') { /* Assume BSD style speed. */ parse_speeds(op, argv[optind++]); op->tty = argv[optind]; } else { op->tty = argv[optind++]; parse_speeds(op, argv[optind]); } optind++; if (argc > optind && argv[optind]) setenv("TERM", argv[optind], 1); #ifdef DO_DEVFS_FIDDLING /* * Some devfs junk, following Goswin Brederlow: * turn ttyS into tts/ * turn tty into vc/ * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=72241 */ if (op->tty && strlen(op->tty) < 90) { char dev_name[100]; struct stat st; if (strncmp(op->tty, "ttyS", 4) == 0) { strcpy(dev_name, "/dev/"); strcat(dev_name, op->tty); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/tts/"); strcat(dev_name, op->tty + 4); if (stat(dev_name, &st) == 0) op->tty = xstrdup(dev_name + 5); } } else if (strncmp(op->tty, "tty", 3) == 0) { strcpy(dev_name, "/dev/"); strncat(dev_name, op->tty, 90); if (stat(dev_name, &st) < 0) { strcpy(dev_name, "/dev/vc/"); strcat(dev_name, op->tty + 3); if (stat(dev_name, &st) == 0) op->tty = xstrdup(dev_name + 5); } } } #endif /* DO_DEVFS_FIDDLING */ debug("exiting parseargs\n"); } /* 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) log_err(_("bad speed: %s"), cp); if (op->numspeed >= MAX_SPEED) log_err(_("too many alternate speeds")); } debug("exiting parsespeeds\n"); } #ifdef SYSV_STYLE /* Update our utmp entry. */ static void update_utmp(char *line) { struct utmp ut; time_t t; int mypid = getpid(); struct utmp *utp; /* * 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(); /* * Find mypid in utmp. * * FIXME: Earlier (when was that?) code here tested only utp->ut_type != * INIT_PROCESS, so maybe the >= here should be >. * * FIXME: The present code is taken from login.c, so if this is changed, * maybe login has to be changed as well (is this true?). */ while ((utp = getutent())) if (utp->ut_pid == mypid && utp->ut_type >= INIT_PROCESS && utp->ut_type <= DEAD_PROCESS) break; if (utp) { memcpy(&ut, utp, sizeof(ut)); } else { /* Some inits do not initialize utmp. */ memset(&ut, 0, sizeof(ut)); strncpy(ut.ut_id, line + 3, sizeof(ut.ut_id)); } 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(); { #ifdef HAVE_UPDWTMP updwtmp(_PATH_WTMP, &ut); #else int ut_fd; int lf; if ((lf = open(_PATH_WTMPLOCK, O_CREAT | O_WRONLY, 0660)) >= 0) { flock(lf, LOCK_EX); if ((ut_fd = open(_PATH_WTMP, O_APPEND | O_WRONLY)) >= 0) { ignore_result(write(ut_fd, &ut, sizeof(ut))); close(ut_fd); } flock(lf, LOCK_UN); close(lf); } #endif /* HAVE_UPDWTMP */ } } #endif /* SYSV_STYLE */ /* Set up tty as stdin, stdout & stderr. */ static void open_tty(char *tty, struct termios *tp, int __attribute__((__unused__)) local) { /* Get rid of the present outputs. */ close(STDOUT_FILENO); close(STDERR_FILENO); errno = 0; /* * Set up new standard input, unless we are given an already opened * port. */ if (strcmp(tty, "-")) { struct stat st; /* Sanity checks. */ if (chdir("/dev")) log_err(_("/dev: chdir() failed: %m")); if (stat(tty, &st) < 0) log_err("/dev/%s: %m", tty); if ((st.st_mode & S_IFMT) != S_IFCHR) log_err(_("/dev/%s: not a character device"), tty); /* Open the tty as standard input. */ close(STDIN_FILENO); errno = 0; debug("open(2)\n"); if (open(tty, O_RDWR | O_NONBLOCK, 0) != 0) log_err(_("/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(STDIN_FILENO, F_GETFL, 0) & O_RDWR) != O_RDWR) log_err(_("%s: not open for read/write"), tty); } /* Set up standard output and standard error file descriptors. */ debug("duping\n"); /* set up stdout and stderr */ if (dup(STDIN_FILENO) != 1 || dup(STDIN_FILENO) != 2) log_err(_("%s: dup problem: %m"), 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. * http://www.sunmanagers.org/archives/1993/0574.html */ memset(tp, 0, sizeof(struct termios)); if (tcgetattr(STDIN_FILENO, tp) < 0) log_err("%s: tcgetattr: %m", tty); /* * Linux login(1) will change tty permissions. Use root owner and group * with permission -rw------- for the period between getty and login. */ ignore_result(chown(tty, 0, 0)); ignore_result(chmod(tty, 0600)); errno = 0; } /* Initialize termios settings. */ static void termio_init(struct options *op, struct termios *tp) { speed_t ispeed, ospeed; if (op->flags & F_KEEPSPEED) { /* Save the original setting. */ ispeed = cfgetispeed(tp); ospeed = cfgetospeed(tp); } else { ospeed = ispeed = op->speeds[FIRST_SPEED]; } /* * 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. */ /* Flush input and output queues, important for modems! */ tcflush(STDIN_FILENO, TCIOFLUSH); tp->c_iflag = tp->c_lflag = tp->c_oflag = 0; if (!(op->flags & F_KEEPCFLAGS)) tp->c_cflag = CS8 | HUPCL | CREAD | (tp->c_cflag & CLOCAL); /* * Note that the speed is stored in the c_cflag termios field, so we have * set the speed always when the cflag se reseted. */ cfsetispeed(tp, ispeed); cfsetospeed(tp, ospeed); if (op->flags & F_LOCAL) tp->c_cflag |= CLOCAL; #ifdef HAVE_STRUCT_TERMIOS_C_LINE tp->c_line = 0; #endif 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 tcsetattr(STDIN_FILENO, TCSANOW, tp); /* Go to blocking input even in local mode. */ fcntl(STDIN_FILENO, F_SETFL, fcntl(STDIN_FILENO, F_GETFL, 0) & ~O_NONBLOCK); debug("term_io 2\n"); } /* Extract baud rate from modem status message. */ static void auto_baud(struct termios *tp) { speed_t 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 later on. */ iflag = tp->c_iflag; /* Enable 8th-bit stripping. */ tp->c_iflag |= ISTRIP; vmin = tp->c_cc[VMIN]; /* Do not block when queue is empty. */ tp->c_cc[VMIN] = 0; tcsetattr(STDIN_FILENO, 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. */ sleep(1); if ((nread = read(STDIN_FILENO, buf, sizeof(buf) - 1)) > 0) { buf[nread] = '\0'; for (bp = buf; bp < buf + nread; bp++) if (isascii(*bp) && isdigit(*bp)) { if ((speed = bcode(bp))) { cfsetispeed(tp, speed); cfsetospeed(tp, speed); } break; } } /* Restore terminal settings. Errors will be dealt with later on. */ tp->c_iflag = iflag; tp->c_cc[VMIN] = vmin; tcsetattr(STDIN_FILENO, TCSANOW, tp); } /* Show login prompt, optionally preceded by /etc/issue contents. */ static void do_prompt(struct options *op, struct termios *tp) { #ifdef ISSUE FILE *fd; int oflag; int c, i; struct utsname uts; uname(&uts); #endif /* ISSUE */ /* Issue not in use, start with a new line. */ ignore_result(write(STDOUT_FILENO, "\r\n", 2)); #ifdef ISSUE if ((op->flags & F_ISSUE) && (fd = fopen(op->issue, "r"))) { /* Save current setting. */ oflag = tp->c_oflag; /* Map new line in output to carriage return & new line. */ tp->c_oflag |= (ONLCR | OPOST); tcsetattr(STDIN_FILENO, TCSADRAIN, tp); while ((c = getc(fd)) != EOF) { if (c == '\\') { c = getc(fd); switch (c) { case 's': printf("%s", uts.sysname); break; case 'n': printf("%s", uts.nodename); break; case 'r': printf("%s", uts.release); break; case 'v': printf("%s", uts.version); break; case 'm': printf("%s", uts.machine); break; case 'o': /* * FIXME: It would be better to use a * separate function for this task. */ { char domainname[MAXHOSTNAMELEN + 1]; #ifdef HAVE_GETDOMAINNAME if (getdomainname(domainname, sizeof(domainname))) #endif /* HAVE_GETDOMAINNAME */ strcpy(domainname, "unknown_domain"); domainname[sizeof(domainname) - 1] = '\0'; printf("%s", domainname); break; } case 'O': /* * FIXME: It would be better to use a * separate function for this task. */ { char *dom = "unknown_domain"; char host[MAXHOSTNAMELEN + 1]; struct addrinfo hints, *info = NULL; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; if (gethostname(host, sizeof(host)) || getaddrinfo(host, NULL, &hints, &info) || info == NULL) { fputs(dom, stdout); } else { char *canon; if (info->ai_canonname && (canon = strchr(info->ai_canonname, '.'))) { dom = canon + 1; } fputs(dom, stdout); freeaddrinfo(info); } break; } case 'd': case 't': /* * FIXME: It would be better to use a * separate function for this task. */ { time_t now; struct tm *tm; time(&now); tm = localtime(&now); if (c == 'd') printf ("%s %s %d %d", nl_langinfo(ABDAY_1 + tm->tm_wday), nl_langinfo(ABMON_1 + tm->tm_mon), tm->tm_mday, /* FIXME: y2070 bug */ tm->tm_year < 70 ? tm->tm_year + 2000 : tm->tm_year + 1900); else printf("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec); break; } case 'l': printf("%s", op->tty); break; case 'b': for (i = 0; speedtab[i].speed; i++) if (speedtab[i].code == cfgetispeed(tp)) printf("%ld", speedtab[i].speed); break; break; case 'u': case 'U': /* * FIXME: It would be better to use a * separate function for this task. */ { int users = 0; struct utmp *ut; setutent(); while ((ut = getutent())) if (ut->ut_type == USER_PROCESS) users++; endutent(); printf("%d ", users); if (c == 'U') printf((users == 1) ? _("user") : _("users")); break; } default: putchar(c); } } else putchar(c); } fflush(stdout); /* Restore settings. */ tp->c_oflag = oflag; /* Wait till output is gone. */ tcsetattr(STDIN_FILENO, TCSADRAIN, tp); fclose(fd); } #endif /* ISSUE */ { char hn[MAXHOSTNAMELEN + 1]; if (gethostname(hn, sizeof(hn)) == 0) ignore_result(write(STDIN_FILENO, hn, strlen(hn))); } /* Always show login prompt. */ ignore_result(write(STDOUT_FILENO, LOGIN, sizeof(LOGIN) - 1)); } /* Select next baud rate. */ static void next_speed(struct options *op, struct termios *tp) { static int baud_index = -1; if (baud_index == -1) /* * If the F_KEEPSPEED flags is set then the FIRST_SPEED is not * tested yet (see termio_init()). */ baud_index = (op->flags & F_KEEPSPEED) ? FIRST_SPEED : 1 % op->numspeed; else baud_index = (baud_index + 1) % op->numspeed; cfsetispeed(tp, op->speeds[baud_index]); cfsetospeed(tp, op->speeds[baud_index]); tcsetattr(STDIN_FILENO, TCSANOW, tp); } /* Get user name, establish parity, speed, erase, kill & eol. */ static char *get_logname(struct options *op, struct termios *tp, 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 */ }; /* Initialize kill, erase, parity etc. (also after switching speeds). */ *cp = init_chardata; /* * Flush pending input (especially important after parsing or switching * the baud rate). */ sleep(1); tcflush(STDIN_FILENO, 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(STDIN_FILENO, &c, 1) < 1) { if (errno == EINTR || errno == EIO) exit(EXIT_SUCCESS); log_err(_("%s: read: %m"), op->tty); } /* Do BREAK handling elsewhere. */ if ((c == 0) && op->numspeed > 1) return EXIT_SUCCESS; /* Do parity bit handling. */ if (op->flags & F_EIGHTBITS) { ascval = c; } else if (c != (ascval = (c & 0177))) { /* Set "parity" bit on. */ for (bits = 1, mask = 1; mask & 0177; mask <<= 1) if (mask & ascval) /* Count "1" bits. */ bits++; cp->parity |= ((bits & 1) ? 1 : 2); } /* Do erase, kill and end-of-line processing. */ switch (ascval) { case CR: case NL: /* Terminate logname. */ *bp = 0; /* Set end-of-line char. */ cp->eol = ascval; break; case BS: case DEL: case '#': /* Set erase character. */ cp->erase = ascval; if (bp > logname) { ignore_result(write (STDIN_FILENO, erase[cp->parity], 3)); bp--; } break; case CTL('U'): case '@': /* Set kill character. */ cp->kill = ascval; while (bp > logname) { ignore_result(write (STDIN_FILENO, erase[cp->parity], 3)); bp--; } break; case CTL('D'): exit(EXIT_SUCCESS); default: if (!isascii(ascval) || !isprint(ascval)) { /* Ignore garbage characters. */ ; } else if ((size_t)(bp - logname) >= sizeof(logname) - 1) { log_err(_("%s: input overrun"), op->tty); } else { /* Echo the character... */ ignore_result(write (STDIN_FILENO, &c, 1)); /* ...and store it. */ *bp++ = ascval; } break; } } } /* Handle names with upper case and no lower case. */ if ((op->flags & F_LCUC) && (cp->capslock = caps_lock(logname))) for (bp = logname; *bp; bp++) if (isupper(*bp)) *bp = tolower(*bp); return logname; } /* Set the final tty mode bits. */ static void termio_final(struct options *op, struct termios *tp, struct chardata *cp) { /* General terminal-independent stuff. */ /* 2-way flow control */ tp->c_iflag |= IXON | IXOFF; 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; tp->c_cc[VQUIT] = DEF_QUIT; tp->c_cc[VEOF] = DEF_EOF; tp->c_cc[VEOL] = DEF_EOL; #ifdef __linux__ tp->c_cc[VSWTC] = DEF_SWITCH; #elif defined(VSWTCH) tp->c_cc[VSWTCH] = DEF_SWITCH; #endif /* __linux__ */ /* Account for special characters seen in input. */ if (cp->eol == CR) { tp->c_iflag |= ICRNL; tp->c_oflag |= ONLCR; } tp->c_cc[VERASE] = cp->erase; tp->c_cc[VKILL] = cp->kill; /* 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; /* do not break */ case 2: /* even parity */ tp->c_cflag |= PARENB; tp->c_iflag |= INPCK | ISTRIP; /* do not break */ 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) { #ifdef IUCLC tp->c_iflag |= IUCLC; #endif #ifdef XCASE tp->c_lflag |= XCASE; #endif #ifdef OLCUC 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 (tcsetattr(STDIN_FILENO, TCSANOW, tp) < 0) log_err("%s: tcsetattr: TCSANOW: %m", op->tty); } /* * String contains upper case without lower case. * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=52940 * http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=156242 */ static int caps_lock(char *s) { int capslock; for (capslock = 0; *s; s++) { if (islower(*s)) return EXIT_SUCCESS; if (capslock == 0) capslock = isupper(*s); } return capslock; } /* Convert speed string to speed code; return 0 on failure. */ static speed_t bcode(char *s) { struct Speedtab *sp; long speed = atol(s); for (sp = speedtab; sp->speed; sp++) if (sp->speed == speed) return sp->code; return 0; } static void __attribute__ ((__noreturn__)) usage(FILE * out) { fprintf(out, _("\nUsage:\n" " %1$s [options] line baud_rate,... [termtype]\n" " %1$s [options] baud_rate,... line [termtype]\n"), program_invocation_short_name); fprintf(out, _("\nOptions:\n" " -8, --8bits assume 8-bit tty\n" " -c, --noreset do not reset control mode\n" " -f, --issue-file FILE display issue file\n" " -h, --flow-control enable hardware flow control\n" " -H, --host HOSTNAME specify login host\n" " -i, --noissue do not display issue file\n" " -I, --init-string STRING set init string\n" " -l, --login-program FILE specify login program\n" " -L, --local-line force local line\n" " -m, --extract-baud extract baud rate during connect\n" " -n, --skip-login do not prompt for login\n" " -s, --keep-baud try to keep baud rate after break\n" " -t, --timeout NUMBER login process timeout\n" " -U, --detect-case detect uppercase terminal\n" " -w, --wait-cr wait carriage-return\n" " --version output version information and exit\n" " --help display this help and exit\n\n")); exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); } /* * Helper function reports errors to console or syslog. * Will be used by log_err() and log_warn() therefore * it takes a format as well as va_list. */ #define str2cpy(b,s1,s2) strcat(strcpy(b,s1),s2) static void dolog(int priority, const char *fmt, va_list ap) { #ifndef USE_SYSLOG int fd; #endif char buf[BUFSIZ]; char *bp; /* * If the diagnostic is reported via syslog(3), the process name is * automatically prepended to the message. If we write directly to * /dev/console, we must prepend the process name ourselves. */ #ifdef USE_SYSLOG buf[0] = '\0'; bp = buf; #else str2cpy(buf, program_invocation_short_name, ": "); bp = buf + strlen(buf); #endif /* USE_SYSLOG */ vsnprintf (bp, sizeof(buf)-strlen(buf), fmt, ap); /* * Write the diagnostic directly to /dev/console if we do not use the * syslog(3) facility. */ #ifdef USE_SYSLOG openlog(program_invocation_short_name, LOG_PID, LOG_AUTHPRIV); syslog(priority, "%s", buf); closelog(); #else /* Terminate with CR-LF since the console mode is unknown. */ strcat(bp, "\r\n"); if ((fd = open("/dev/console", 1)) >= 0) { ignore_result(write(fd, buf, strlen(buf))); close(fd); } #endif /* USE_SYSLOG */ } static void log_err(const char *fmt, ...) { va_list ap; va_start(ap, fmt); dolog(LOG_ERR, fmt, ap); va_end(ap); /* Be kind to init(8). */ sleep(10); exit(EXIT_FAILURE); } static void log_warn(const char *fmt, ...) { va_list ap; va_start(ap, fmt); dolog(LOG_WARNING, fmt, ap); va_end(ap); }