int
main(int argc, char **argv)
{
char *cp, **ap;
int ch, disc;
FILE *wfd = NULL;
char *dialerstring = 0, buf[BUFSIZ];
int unitnum, keepal = 0, outfill = 0;
char unitname[32];
char *password;
char *upscript = NULL, *downscript = NULL;
int first = 1, tries = 0;
time_t fintimeout;
long lpid;
pid_t pid;
struct termios t;
int result;
while ((ch = getopt(argc, argv, "dhlb:s:t:w:A:U:D:W:K:O:S:L")) != -1)
switch (ch) {
case 'd':
debug = 1;
break;
case 'b':
speed = atoi(optarg);
break;
case 's':
if (diali >= MAXDIALS)
errx(1, "max dial strings number (%d) exceeded", MAXDIALS);
dials[diali++] = strdup(optarg);
break;
case 't':
script_timeout = atoi(optarg);
break;
case 'w':
wait_time = atoi(optarg);
break;
case 'W':
MAXTRIES = atoi(optarg);
break;
case 'A':
annex = strdup(optarg);
break;
case 'U':
upscript = strdup(optarg);
break;
case 'D':
downscript = strdup(optarg);
break;
case 'L':
uucp_lock = 1;
break;
case 'l':
modem_control = 0;
break;
case 'h':
flowcontrol = FC_HW;
break;
case 'K':
keepal = atoi(optarg);
break;
case 'O':
outfill = atoi(optarg);
break;
case 'S':
sl_unit = atoi(optarg);
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc != 3)
usage();
/*
* Copy these so they exist after we clobber them.
*/
devicename = strdup(argv[0]);
username = strdup(argv[1]);
password = strdup(argv[2]);
/*
* Security hack. Do not want private information such as the
* password and possible phone number to be left around.
* So we clobber the arguments.
*/
for (ap = argv - optind + 1; ap < argv + 3; ap++)
for (cp = *ap; *cp != 0; cp++)
*cp = '\0';
openlog("startslip", LOG_PID|LOG_PERROR, LOG_DAEMON);
if (debug)
setbuf(stdout, NULL);
signal(SIGTERM, sigterm);
if ((dvname = strrchr(devicename, '/')) == NULL)
dvname = devicename;
else
dvname++;
result = snprintf(my_pidfile, sizeof(my_pidfile),
PIDFILE, _PATH_VARRUN, dvname);
if (result < 0 || (unsigned int)result >= sizeof(my_pidfile))
usage();
if ((pfd = fopen(my_pidfile, "r")) != NULL) {
if (fscanf(pfd, "%ld\n", &lpid) == 1) {
pid = lpid;
if (pid == lpid && pid > 0)
kill(pid, SIGTERM);
}
fclose(pfd);
pfd = NULL; /* not remove pidfile yet */
sleep(5); /* allow down script to be completed */
} else
restart:
signal(SIGHUP, SIG_IGN);
signal(SIGURG, SIG_IGN);
hup = 0;
if (wfd) {
printd("fclose, ");
fclose(wfd);
conn_time = time(NULL) - start_time;
if (uucp_lock)
uu_unlock(dvname);
locked = 0;
wfd = NULL;
fd = -1;
sleep(5);
} else if (fd >= 0) {
printd("close, ");
close(fd);
conn_time = time(NULL) - start_time;
if (uucp_lock)
uu_unlock(dvname);
locked = 0;
fd = -1;
sleep(5);
}
if (logged_in) {
syslog(LOG_INFO, "%s: connection time elapsed: %ld secs",
username, (long)conn_time);
sprintf(buf, "LINE=%d %s %s down",
diali ? (dialc - 1) % diali : 0,
downscript ? downscript : "/sbin/ifconfig" , unitname);
system(buf);
logged_in = 0;
}
if (terminate)
down(0);
tries++;
if (MAXTRIES > 0 && tries > MAXTRIES) {
syslog(LOG_ERR, "%s: exiting login after %d tries", username, tries);
/* ???
if (first)
*/
down(3);
}
if (tries > 1) {
syslog(LOG_INFO, "%s: sleeping %d seconds (%d tries)",
username, wait_time * (tries - 1), tries);
sleep(wait_time * (tries - 1));
if (terminate)
goto restart;
}
if (daemon(1, debug) < 0) {
syslog(LOG_ERR, "%s: daemon: %m", username);
down(2);
}
pid = getpid();
printd("restart: pid %ld: ", (long)pid);
if ((pfd = fopen(my_pidfile, "w")) != NULL) {
fprintf(pfd, "%ld\n", (long)pid);
fclose(pfd);
}
printd("open");
if (uucp_lock) {
int res;
if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
if (res != UU_LOCK_INUSE)
syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
syslog(LOG_ERR, "%s: can't lock %s", username, devicename);
goto restart;
}
locked = 1;
}
if ((fd = open(devicename, O_RDWR | O_NONBLOCK)) < 0) {
syslog(LOG_ERR, "%s: open %s: %m", username, devicename);
if (first)
down(1);
else {
if (uucp_lock)
uu_unlock(dvname);
locked = 0;
goto restart;
}
}
printd(" %d", fd);
signal(SIGHUP, sighup);
if (ioctl(fd, TIOCSCTTY, 0) < 0) {
syslog(LOG_ERR, "%s: ioctl (TIOCSCTTY): %m", username);
down(2);
}
if (tcsetpgrp(fd, getpid()) < 0) {
syslog(LOG_ERR, "%s: tcsetpgrp failed: %m", username);
down(2);
}
printd(", ioctl\n");
if (tcgetattr(fd, &t) < 0) {
syslog(LOG_ERR, "%s: tcgetattr(%s): %m", username, devicename);
down(2);
}
cfmakeraw(&t);
switch (flowcontrol) {
case FC_HW:
t.c_cflag |= (CRTS_IFLOW|CCTS_OFLOW);
break;
case FC_NONE:
t.c_cflag &= ~(CRTS_IFLOW|CCTS_OFLOW);
break;
}
if (modem_control)
t.c_cflag |= HUPCL;
else
t.c_cflag &= ~(HUPCL);
t.c_cflag |= CLOCAL; /* until modem commands passes */
cfsetispeed(&t, speed);
cfsetospeed(&t, speed);
if (tcsetattr(fd, TCSAFLUSH, &t) < 0) {
syslog(LOG_ERR, "%s: tcsetattr(%s): %m", username, devicename);
down(2);
}
sleep(2); /* wait for flakey line to settle */
if (hup || terminate)
goto restart;
wfd = fdopen(fd, "w+");
if (wfd == NULL) {
syslog(LOG_ERR, "%s: can't fdopen %s: %m", username, devicename);
down(2);
}
setbuf(wfd, NULL);
if (diali > 0)
dialerstring = dials[dialc++ % diali];
if (dialerstring) {
syslog(LOG_INFO, "%s: dialer string: %s\\r", username, dialerstring);
fprintf(wfd, "%s\r", dialerstring);
}
printd("\n");
fintimeout = time(NULL) + script_timeout;
if (modem_control) {
printd("waiting for carrier\n");
while (time(NULL) < fintimeout && !carrier()) {
sleep(1);
if (hup || terminate)
goto restart;
}
if (!carrier())
goto restart;
t.c_cflag &= ~(CLOCAL);
if (tcsetattr(fd, TCSANOW, &t) < 0) {
syslog(LOG_ERR, "%s: tcsetattr(%s): %m", username, devicename);
down(2);
}
/* Only now we able to receive HUP on carrier drop! */
}
/*
* Log in
*/
printd("look for login: "******"slip\r");
printd("Sent \"slip\"\n");
continue;
}
if (bcmp(&buf[1], "sername:", 8) == 0) {
fprintf(wfd, "%s\r", username);
printd("Sent login: %s\n", username);
continue;
}
if (bcmp(&buf[1], "assword:", 8) == 0) {
fprintf(wfd, "%s\r", password);
printd("Sent password: %s\n", password);
break;
}
} else {
if (strstr(&buf[1], "ogin:") != NULL) {
fprintf(wfd, "%s\r", username);
printd("Sent login: %s\n", username);
continue;
}
if (strstr(&buf[1], "assword:") != NULL) {
fprintf(wfd, "%s\r", password);
printd("Sent password: %s\n", password);
break;
}
}
}
sleep(5); /* Wait until login completed */
if (hup || terminate)
goto restart;
start_time = time(NULL);
/*
* Attach
*/
printd("setd");
disc = SLIPDISC;
if (ioctl(fd, TIOCSETD, &disc) < 0) {
syslog(LOG_ERR, "%s: ioctl (%s, TIOCSETD): %m",
username, devicename);
down(2);
}
if (sl_unit >= 0 && ioctl(fd, SLIOCSUNIT, &sl_unit) < 0) {
syslog(LOG_ERR, "%s: ioctl(SLIOCSUNIT): %m", username);
down(2);
}
if (ioctl(fd, SLIOCGUNIT, &unitnum) < 0) {
syslog(LOG_ERR, "%s: ioctl(SLIOCGUNIT): %m", username);
down(2);
}
sprintf(unitname, "sl%d", unitnum);
if (keepal > 0) {
signal(SIGURG, sigurg);
if (ioctl(fd, SLIOCSKEEPAL, &keepal) < 0) {
syslog(LOG_ERR, "%s: ioctl(SLIOCSKEEPAL): %m", username);
down(2);
}
}
if (outfill > 0 && ioctl(fd, SLIOCSOUTFILL, &outfill) < 0) {
syslog(LOG_ERR, "%s: ioctl(SLIOCSOUTFILL): %m", username);
down(2);
}
sprintf(buf, "LINE=%d %s %s up",
diali ? (dialc - 1) % diali : 0,
upscript ? upscript : "/sbin/ifconfig" , unitname);
system(buf);
printd(", ready\n");
if (!first)
syslog(LOG_INFO, "%s: reconnected on %s (%d tries)", username, unitname, tries);
else
syslog(LOG_INFO, "%s: connected on %s", username, unitname);
first = 0;
tries = 0;
logged_in = 1;
while (hup == 0 && terminate == 0) {
sigpause(0L);
printd("sigpause return\n");
}
goto restart;
return(0); /* not reached */
}
int
ID0uu_lock(const char *basettyname)
{
int ret;
ID0set0();
ret = uu_lock(basettyname);
log_Printf(LogID0, "%d = uu_lock(\"%s\")\n", ret, basettyname);
ID0setuser();
return ret;
}
long
hunt(char *name)
{
char *cp;
sig_t f;
int res;
f = signal(SIGALRM, dead);
while ((cp = getremote(name))) {
deadfl = 0;
if ((uucplock = strrchr(cp, '/')) == NULL)
uucplock = cp;
else
++uucplock;
if ((res = uu_lock(uucplock)) != UU_LOCK_OK) {
if (res != UU_LOCK_INUSE)
fprintf(stderr, "uu_lock: %s\n", uu_lockerr(res));
continue;
}
/*
* Straight through call units, such as the BIZCOMP,
* VADIC and the DF, must indicate they're hardwired in
* order to get an open file descriptor placed in FD.
* Otherwise, as for a DN-11, the open will have to
* be done in the "open" routine.
*/
if (!HW)
break;
if (setjmp(deadline) == 0) {
alarm(10);
FD = open(cp, O_RDWR);
}
alarm(0);
if (FD < 0) {
warn("%s", cp);
deadfl = 1;
}
if (!deadfl) {
ioctl(FD, TIOCEXCL, 0);
{
struct termios t;
if (tcgetattr(FD, &t) == 0) {
t.c_cflag |= HUPCL;
(void)tcsetattr(FD, TCSANOW, &t);
}
}
signal(SIGALRM, SIG_DFL);
return ((long)cp);
}
(void)uu_unlock(uucplock);
}
signal(SIGALRM, f);
return (deadfl ? -1 : (long)cp);
}
long
hunt(char *name)
{
char *cp;
sig_t f;
f = signal(SIGALRM, dead);
while ((cp = getremote(name))) {
deadfl = 0;
uucplock = strrchr(cp, '/');
if (uucplock == NULL)
uucplock = cp;
else
uucplock++;
if (uu_lock(uucplock) < 0)
continue;
/*
* Straight through call units, such as the BIZCOMP,
* VADIC and the DF, must indicate they're hardwired in
* order to get an open file descriptor placed in FD.
* Otherwise, as for a DN-11, the open will have to
* be done in the "open" routine.
*/
if (!HW)
break;
if (setjmp(deadline) == 0) {
alarm(10);
FD = open(cp, (O_RDWR |
(boolean(value(DC)) ? O_NONBLOCK : 0)));
}
alarm(0);
if (FD < 0) {
perror(cp);
deadfl = 1;
}
if (!deadfl) {
struct termios cntrl;
tcgetattr(FD, &cntrl);
if (!boolean(value(DC)))
cntrl.c_cflag |= HUPCL;
tcsetattr(FD, TCSAFLUSH, &cntrl);
ioctl(FD, TIOCEXCL, 0);
signal(SIGALRM, SIG_DFL);
return ((long)cp);
}
(void)uu_unlock(uucplock);
}
signal(SIGALRM, f);
return (deadfl ? -1 : (long)cp);
}
int
ExclusiveOpenDevice(const char *label, const char *pathname)
{
int fd, locked = FALSE;
const char *ttyname = NULL;
time_t startTime;
/* Lock device UUCP style, if it resides in /dev */
if (!strncmp(pathname, _PATH_DEV, 5)) {
int res;
ttyname = pathname + 5;
if ((res = uu_lock(ttyname)) != UU_LOCK_OK) {
Log(LG_ERR, ("[%s] uu_lock(%s): %s", label, ttyname, uu_lockerr(res)));
return (-1);
}
locked = TRUE;
}
/* Open it, but give up after so many interruptions */
for (startTime = time(NULL);
(fd = open(pathname, O_RDWR, 0)) < 0
&& time(NULL) < startTime + MAX_OPEN_DELAY;)
if (errno != EINTR) {
Perror("[%s] can't open %s", label, pathname);
if (locked)
uu_unlock(ttyname);
return (-1);
}
/* Did we succeed? */
if (fd < 0) {
Log(LG_ERR, ("[%s] can't open %s after %d secs",
label, pathname, MAX_OPEN_DELAY));
if (locked)
uu_unlock(ttyname);
return (-1);
}
(void)fcntl(fd, F_SETFD, 1);
/* Done */
return (fd);
}
/* sighup_handler() is invoked when carrier drops, eg. before redial. */
static void
sighup_handler(int signo __unused)
{
if(exiting) return;
if (redial_cmd == NULL) {
syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); exiting", dev, unit);
exit_handler(1);
}
again:
/* invoke a shell for redial_cmd or punt. */
if (*redial_cmd) { /* Non-empty redial command */
syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); running '%s'",
dev, unit, redial_cmd);
acquire_line(); /* reopen dead line */
setup_line(CLOCAL);
if (locked) {
if (uucp_lock)
uu_unlock(dvname); /* for redial */
locked = 0;
}
if (system(redial_cmd))
goto again;
if (uucp_lock) {
int res;
if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
if (res != UU_LOCK_INUSE)
syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
syslog(LOG_ERR, "can't relock %s after %s, aborting",
dev, redial_cmd);
exit_handler(1);
}
locked = 1;
}
/* Now check again for carrier (dial command is done): */
if (!(modem_control & CLOCAL)) {
tty.c_cflag &= ~CLOCAL;
if (tcsetattr(fd, TCSAFLUSH, &tty) < 0) {
syslog(LOG_ERR, "tcsetattr(TCSAFLUSH): %m");
exit_handler(1);
}
ioctl(fd, TIOCMGET, &comstate);
if (!(comstate & TIOCM_CD)) { /* check for carrier */
/* force a redial if no carrier */
goto again;
}
} else
setup_line(0);
} else { /* Empty redial command */
syslog(LOG_NOTICE,"SIGHUP on %s (sl%d); reestablish connection",
dev, unit);
acquire_line(); /* reopen dead line */
setup_line(0); /* restore ospeed from hangup (B0) */
/* If modem control, just wait for carrier before attaching.
If no modem control, just fall through immediately. */
if (!(modem_control & CLOCAL)) {
int carrier = 0;
syslog(LOG_NOTICE, "waiting for carrier on %s (sl%d)",
dev, unit);
/* Now wait for carrier before attaching line. */
/* We must poll since CLOCAL prevents signal. */
while (! carrier) {
sleep(2);
ioctl(fd, TIOCMGET, &comstate);
if (comstate & TIOCM_CD)
carrier = 1;
}
syslog(LOG_NOTICE, "carrier now present on %s (sl%d)",
dev, unit);
}
}
slip_discipline();
configure_network();
}
/* Close all FDs, fork, reopen tty port as 0-2, and make it the
controlling terminal for our process group. */
static void
acquire_line(void)
{
int ttydisc = TTYDISC;
int oflags;
FILE *pid_file;
/* reset to tty discipline */
if (fd >= 0 && ioctl(fd, TIOCSETD, &ttydisc) < 0) {
syslog(LOG_ERR, "ioctl(TIOCSETD): %m");
exit_handler(1);
}
close(STDIN_FILENO); /* close FDs before forking. */
close(STDOUT_FILENO);
close(STDERR_FILENO);
if (fd > 2)
close(fd);
signal(SIGHUP, SIG_IGN); /* ignore HUP signal when parent dies. */
if (daemon(0,0)) { /* fork, setsid, chdir /, and close std*. */
syslog(LOG_ERR, "daemon(0,0): %m");
exit_handler(1);
}
while (getppid () != 1)
sleep (1); /* Wait for parent to die. */
/* create PID file */
if((pid_file = fopen(pidfilename, "w"))) {
fprintf(pid_file, "%ld\n", (long)getpid());
fclose(pid_file);
}
if (signal(SIGHUP,sighup_handler) == SIG_ERR) /* Re-enable HUP signal */
syslog(LOG_NOTICE,"cannot install SIGHUP handler: %m");
if (uucp_lock) {
/* unlock not needed here, always re-lock with new pid */
int res;
if ((res = uu_lock(dvname)) != UU_LOCK_OK) {
if (res != UU_LOCK_INUSE)
syslog(LOG_ERR, "uu_lock: %s", uu_lockerr(res));
syslog(LOG_ERR, "can't lock %s", dev);
exit_handler(1);
}
locked = 1;
}
if ((fd = open(dev, O_RDWR | O_NONBLOCK, 0)) < 0) {
syslog(LOG_ERR, "open(%s) %m", dev);
exit_handler(1);
}
/* Turn off O_NONBLOCK for dumb redialers, if any. */
if ((oflags = fcntl(fd, F_GETFL)) == -1) {
syslog(LOG_ERR, "fcntl(F_GETFL) failed: %m");
exit_handler(1);
}
if (fcntl(fd, F_SETFL, oflags & ~O_NONBLOCK) == -1) {
syslog(LOG_ERR, "fcntl(F_SETFL) failed: %m");
exit_handler(1);
}
dup2(fd, STDIN_FILENO);
dup2(fd, STDOUT_FILENO);
dup2(fd, STDERR_FILENO);
if (fd > 2)
close (fd);
fd = STDIN_FILENO;
/* acquire the serial line as a controlling terminal. */
if (ioctl(fd, TIOCSCTTY, 0) < 0) {
syslog(LOG_ERR,"ioctl(TIOCSCTTY): %m");
exit_handler(1);
}
/* Make us the foreground process group associated with the
slip line which is our controlling terminal. */
if (tcsetpgrp(fd, getpid()) < 0)
syslog(LOG_NOTICE,"tcsetpgrp failed: %m");
}
