int main(int argc, char **argv)
{
char *tty = NULL;
char *p;
struct passwd *pwd;
int c, fd = -1;
int opt_e = 0;
pid_t pid, pgrp, ppgrp, ttypgrp;
/*
* See if we have a timeout flag.
*/
opterr = 0;
while((c = getopt(argc, argv, "ept:")) != EOF) switch(c) {
case 't':
timeout = atoi(optarg);
break;
case 'p':
profile = 1;
break;
case 'e':
opt_e = 1;
break;
default:
usage();
/* Do not exit! */
break;
}
#if 0
if (geteuid() != 0) {
fprintf(stderr, "sulogin: only root can run sulogin.\n");
exit(1);
}
#endif
/*
* See if we need to open an other tty device.
*/
saved_sigint = signal(SIGINT, SIG_IGN);
saved_sigtstp = signal(SIGQUIT, SIG_IGN);
saved_sigquit = signal(SIGTSTP, SIG_IGN);
if (optind < argc) tty = argv[optind];
if (tty || (tty = getenv("CONSOLE"))) {
if ((fd = open(tty, O_RDWR)) < 0) {
perror(tty);
fd = dup(0);
}
if (!isatty(fd)) {
fprintf(stderr, "%s: not a tty\n", tty);
close(fd);
} else {
/*
* Only go through this trouble if the new
* tty doesn't fall in this process group.
*/
pid = getpid();
pgrp = getpgid(0);
ppgrp = getpgid(getppid());
ttypgrp = tcgetpgrp(fd);
if (pgrp != ttypgrp && ppgrp != ttypgrp) {
if (pid != getsid(0)) {
if (pid == getpgid(0))
setpgid(0, getpgid(getppid()));
setsid();
}
signal(SIGHUP, SIG_IGN);
if (ttypgrp > 0)
ioctl(0, TIOCNOTTY, (char *)1);
signal(SIGHUP, SIG_DFL);
close(0);
close(1);
close(2);
if (fd > 2)
close(fd);
if ((fd = open(tty, O_RDWR|O_NOCTTY)) < 0) {
perror(tty);
} else {
ioctl(0, TIOCSCTTY, (char *)1);
tcsetpgrp(fd, ppgrp);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
} else
if (fd > 2)
close(fd);
}
} else if (getpid() == 1) {
/* We are init. We hence need to set a session anyway */
setsid();
if (ioctl(0, TIOCSCTTY, (char *)1))
perror("ioctl(TIOCSCTTY)");
}
#if defined(SANE_TIO) && (SANE_TIO == 1)
fixtty();
#endif
/*
* Get the root password.
*/
if ((pwd = getrootpwent(opt_e)) == NULL) {
fprintf(stderr, "sulogin: cannot open password database!\n");
sleep(2);
}
sushell(pwd);
/*
* Ask for the password.
*/
while(pwd) {
if ((p = getpasswd(pwd->pw_passwd)) == NULL) break;
if (pwd->pw_passwd[0] == 0 ||
strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd) == 0)
sushell(pwd);
saved_sigquit = signal(SIGQUIT, SIG_IGN);
saved_sigtstp = signal(SIGTSTP, SIG_IGN);
saved_sigint = signal(SIGINT, SIG_IGN);
printf("Login incorrect.\n");
}
/*
* User pressed Control-D.
*/
return 0;
}
int main(int argc, char **argv)
{
char *tty = NULL;
char *p;
struct passwd *pwd;
int c, fd = -1;
int opt_e = 0;
pid_t pid, pgrp, ppgrp, ttypgrp;
struct sigaction saved_sighup;
static const struct option longopts[] = {
{ "login-shell", 0, 0, 'p' },
{ "timeout", 1, 0, 't' },
{ "force", 0, 0, 'e' },
{ "help", 0, 0, 'h' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
/*
* See if we have a timeout flag.
*/
while ((c = getopt_long(argc, argv, "ehpt:V", longopts, NULL)) != -1) {
switch(c) {
case 't':
timeout = strtou32_or_err(optarg, _("invalid timeout argument"));
break;
case 'p':
profile = 1;
break;
case 'e':
opt_e = 1;
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'h':
usage(stdout);
return EXIT_SUCCESS;
default:
usage(stderr);
/* Do not exit! */
break;
}
}
if (geteuid() != 0)
errx(EXIT_FAILURE, _("only root can run this program."));
/*
* See if we need to open an other tty device.
*/
mask_signal(SIGQUIT, SIG_IGN, &saved_sigquit);
mask_signal(SIGTSTP, SIG_IGN, &saved_sigtstp);
mask_signal(SIGINT, SIG_IGN, &saved_sigint);
if (optind < argc)
tty = argv[optind];
if (tty || (tty = getenv("CONSOLE"))) {
if ((fd = open(tty, O_RDWR)) < 0) {
warn(_("cannot open %s"), tty);
fd = dup(0);
}
if (!isatty(fd)) {
warn(_("%s: not a tty"), tty);
close(fd);
} else {
/*
* Only go through this trouble if the new tty doesn't
* fall in this process group.
*/
pid = getpid();
pgrp = getpgid(0);
ppgrp = getpgid(getppid());
ttypgrp = tcgetpgrp(fd);
if (pgrp != ttypgrp && ppgrp != ttypgrp) {
if (pid != getsid(0)) {
if (pid == getpgid(0))
setpgid(0, getpgid(getppid()));
setsid();
}
sigaction(SIGHUP, NULL, &saved_sighup);
if (ttypgrp > 0)
ioctl(0, TIOCNOTTY, (char *)1);
sigaction(SIGHUP, &saved_sighup, NULL);
close(0);
close(1);
close(2);
if (fd > 2)
close(fd);
if ((fd = open(tty, O_RDWR|O_NOCTTY)) < 0)
warn(_("cannot open %s"), tty);
else {
ioctl(0, TIOCSCTTY, (char *)1);
tcsetpgrp(fd, ppgrp);
dup2(fd, 0);
dup2(fd, 1);
dup2(fd, 2);
if (fd > 2)
close(fd);
}
} else
if (fd > 2)
close(fd);
}
} else if (getpid() == 1) {
/* We are init. We hence need to set a session anyway */
setsid();
if (ioctl(0, TIOCSCTTY, (char *)1))
warn(_("TIOCSCTTY: ioctl failed"));
}
fixtty();
/*
* Get the root password.
*/
if ((pwd = getrootpwent(opt_e)) == NULL) {
warnx(_("cannot open password database."));
sleep(2);
}
/*
* Ask for the password.
*/
while (pwd) {
if ((p = getpasswd(pwd->pw_passwd)) == NULL)
break;
if (pwd->pw_passwd[0] == 0 ||
strcmp(crypt(p, pwd->pw_passwd), pwd->pw_passwd) == 0)
sushell(pwd);
mask_signal(SIGQUIT, SIG_IGN, &saved_sigquit);
mask_signal(SIGTSTP, SIG_IGN, &saved_sigtstp);
mask_signal(SIGINT, SIG_IGN, &saved_sigint);
fprintf(stderr, _("Login incorrect\n\n"));
}
/*
* User pressed Control-D.
*/
return EXIT_SUCCESS;
}
