diff options
Diffstat (limited to 'daemons/getty.c')
| -rw-r--r-- | daemons/getty.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/daemons/getty.c b/daemons/getty.c new file mode 100644 index 00000000..40ad4d73 --- /dev/null +++ b/daemons/getty.c @@ -0,0 +1,213 @@ +/* Stubby version of getty for Hurd + + Copyright (C) 1996, 1998, 1999, 2007, 2014 + Free Software Foundation, Inc. + + Written by Michael I. Bushnell, p/BSG. + + This file is part of the GNU Hurd. + + The GNU Hurd is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + The GNU Hurd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */ + +#include <syslog.h> +#include <unistd.h> +#include <ttyent.h> +#include <stdio.h> +#include <fcntl.h> +#include <sys/stat.h> +#include <errno.h> +#include <error.h> +#include <sys/utsname.h> +#include <stdlib.h> +#include <string.h> +#include <utmp.h> +#include <sys/ioctl.h> +#include <termios.h> + +/* XXX */ +extern char *localhost (); + +#define _PATH_LOGIN "/bin/login" +#define _PATH_ISSUE "/etc/issue" + +/* Parse the terminal speed. */ +static void +set_speed (int tty, char *speedstr) +{ + error_t err; + struct termios ttystat; + speed_t speed; + char *tail; + + errno = 0; + speed = strtoul (speedstr, &tail, 0); + if (errno || *tail) + return; + + err = tcgetattr (tty, &ttystat); + if (!err && !cfsetspeed (&ttystat, speed)) + tcsetattr (tty, TCSAFLUSH, &ttystat); +} + +/* Load a banner from _PATH_ISSUE. If that fails, a built-in version + is provided. */ +static char * +load_banner (void) +{ + char *buf = NULL, *p; + struct stat st; + int fd; + ssize_t remaining, count; + + fd = open (_PATH_ISSUE, O_RDONLY); + if (fd == -1) + goto out; + + if (fstat (fd, &st) == -1) + goto out; + + buf = malloc (st.st_size + 1); + if (buf == NULL) + goto out; + + remaining = st.st_size; + p = buf; + while (remaining > 0) + { + count = read (fd, p, remaining); + if (count == -1) + { + close (fd); + goto out; + } + p += count; + remaining -= count; + } + + buf[st.st_size] = '\0'; + close (fd); + return buf; + + out: + free (buf); + return "\n\\s \\r (\\n) (\\l)\r\n\n"; +} + +/* Print a suitable welcome banner */ +static void +print_banner (int fd, char *ttyname) +{ + char *s, *t, *expansion; + struct utsname u; + + if (uname (&u)) + u.sysname[0] = u.release[0] = '\0'; + + write (fd, "\r\n", 2); + for (s = load_banner (); *s; s++) + { + for (t = s; *t && *t != '\\'; t++) /* nomnomnom */; + + write (fd, s, t - s); + if (! *t) + return; + + switch (*(t + 1)) + { + case '\\': + expansion = "\\"; + break; + case 's': + expansion = u.sysname; + break; + case 'r': + expansion = u.release; + break; + case 'n': + expansion = localhost () ?: "?"; + break; + case 'l': + expansion = basename (ttyname); + break; + default: + expansion = "?"; + } + write (fd, expansion, strlen (expansion)); + + s = t + 1; + } +} + +int +main (int argc, char **argv) +{ + char *linespec, *ttyname; + int tty; + struct ttyent *tt; + char *arg; + + openlog ("getty", LOG_ODELAY|LOG_CONS|LOG_PID, LOG_AUTH); + + /* Nothing to do .... */ + if (argc != 3) + { + syslog (LOG_ERR, "Bad syntax"); + closelog (); + exit (1); + } + + /* Don't do anything with this for now. */ + linespec = argv[1]; + + tt = getttynam (argv[2]); + asprintf (&ttyname, "%s/%s", _PATH_DEV, argv[2]); + + chown (ttyname, 0, 0); + chmod (ttyname, 0600); + revoke (ttyname); + sleep (2); /* leave DTR down for a bit */ + + do + { + tty = open (ttyname, O_RDWR); + if (tty == -1) + { + syslog (LOG_ERR, "%s: %m", ttyname); + closelog (); + sleep (60); + } + } + while (tty == -1); + + set_speed (tty, linespec); + + print_banner (tty, ttyname); + + if (login_tty (tty) == -1) + syslog (LOG_ERR, "cannot set controlling terminal to %s: %m", ttyname); + + asprintf (&arg, "TERM=%s", tt ? tt->ty_type : "unknown"); + + if (tt && strcmp (tt->ty_type, "dialup") == 0) + /* Dialup lines time out (which is login's default). */ + execl (_PATH_LOGIN, "login", "-e", arg, NULL); + else + /* Hardwired lines don't. */ + execl (_PATH_LOGIN, "login", "-e", arg, "-aNOAUTH_TIMEOUT", NULL); + + syslog (LOG_ERR, "%s: %m", _PATH_LOGIN); + + return 1; +} |