/* Very, very minimal hangup function. This just attempts to hang up a device
* that should already be hung up, so it does not need to be bulletproof. */
static void
hangup(shvarFile *ifcfg) {
int fd;
char *line;
struct termios original_ts, ts;
line = svGetValue(ifcfg, "MODEMPORT");
if (line == NULL)
return;
fd = open(line, O_RDWR | O_NOCTTY | O_NONBLOCK);
if (fd != -1) {
if (tcgetattr(fd, &ts) != -1) {
original_ts = ts;
write(fd, "\r", 1); /* tickle modems that do not like dropped DTR */
usleep(1000);
cfsetospeed(&ts, B0);
tcsetattr(fd, TCSANOW, &ts);
usleep(100000);
tcsetattr(fd, TCSANOW, &original_ts);
}
close(fd);
}
free(line);
}
static char *
plugin_get_hostname (SCPluginIfcfg *plugin)
{
shvarFile *network;
char *hostname;
gboolean ignore_localhost;
if (g_file_get_contents (HOSTNAME_FILE, &hostname, NULL, NULL)) {
g_strchomp (hostname);
return hostname;
}
network = svOpenFile (SC_NETWORK_FILE, NULL);
if (!network) {
_LOGW ("Could not get hostname: failed to read " SC_NETWORK_FILE);
return NULL;
}
hostname = svGetValue (network, "HOSTNAME", FALSE);
ignore_localhost = svTrueValue (network, "NM_IGNORE_HOSTNAME_LOCALHOST", FALSE);
if (ignore_localhost) {
/* Ignore a default hostname ('localhost[6]' or 'localhost[6].localdomain[6]')
* to preserve 'network' service behavior.
*/
if (hostname && !nm_utils_is_specific_hostname (hostname)) {
g_free (hostname);
hostname = NULL;
}
}
svCloseFile (network);
return hostname;
}
int
main(int argc, char **argv) {
int status;
pid_t waited;
char *device, *real_device, *physicalDevice = NULL;
char *boot = NULL;
shvarFile *ifcfg;
sigset_t blockedsigs, unblockedsigs;
int pppdPid = 0;
int timeout = 30;
char *temp;
gboolean dying = FALSE;
int sendsig;
gboolean connectedOnce = FALSE;
int maxfail = 0; // MAXFAIL Patch <*****@*****.**>
if (argc < 2) {
fprintf (stderr, "usage: ppp-watch <interface-name> [boot]\n");
exit(30);
}
if (strncmp(argv[1], "ifcfg-", 6) == 0) {
device = argv[1] + 6;
} else {
device = argv[1];
}
detach(device); /* Prepare a child process to monitor pppd. When we
return, we'll be in the child. */
if ((argc > 2) && (strcmp("boot", argv[2]) == 0)) {
boot = argv[2];
}
ifcfg = shvarfilesGet(device);
if (ifcfg == NULL)
failureExit(28);
real_device = svGetValue(ifcfg, "DEVICE");
if (real_device == NULL)
real_device = device;
doPidFile(real_device);
/* We'll want to know which signal interrupted our sleep below, so
* attach a signal handler to these. */
set_signal(SIGTERM, signal_tracker);
set_signal(SIGINT, signal_tracker);
set_signal(SIGHUP, signal_tracker);
set_signal(SIGIO, signal_tracker);
set_signal(SIGCHLD, signal_tracker);
/* We time out only if we're being run at boot-time. */
if (boot) {
temp = svGetValue(ifcfg, "BOOTTIMEOUT");
if (temp) {
timeout = atoi(temp);
if (timeout < 1) timeout = 1;
free(temp);
} else {
timeout = 30;
}
set_signal(SIGALRM, signal_tracker);
alarm(timeout);
}
/* Register us to get a signal when something changes. Yes, that's vague. */
fork_exec(TRUE, "/sbin/netreport", NULL, NULL, NULL);
/* Reset theSigchld, which should have been triggered by netreport. */
theSigchld = 0;
/* We don't set up the procmask until after we have received the netreport
* signal. Do so now. */
sigemptyset(&blockedsigs);
sigaddset(&blockedsigs, SIGTERM);
sigaddset(&blockedsigs, SIGINT);
sigaddset(&blockedsigs, SIGHUP);
sigaddset(&blockedsigs, SIGIO);
sigaddset(&blockedsigs, SIGCHLD);
if (boot) {
sigaddset(&blockedsigs, SIGALRM);
}
sigprocmask(SIG_BLOCK, &blockedsigs, NULL);
sigfillset(&unblockedsigs);
sigdelset(&unblockedsigs, SIGTERM);
sigdelset(&unblockedsigs, SIGINT);
sigdelset(&unblockedsigs, SIGHUP);
sigdelset(&unblockedsigs, SIGIO);
sigdelset(&unblockedsigs, SIGCHLD);
if (boot) {
sigdelset(&unblockedsigs, SIGALRM);
}
sigprocmask(SIG_UNBLOCK, &unblockedsigs, NULL);
/* Initialize the retry timeout using the RETRYTIMEOUT setting. */
temp = svGetValue(ifcfg, "RETRYTIMEOUT");
if (temp) {
timeout = atoi(temp);
free(temp);
} else {
timeout = 30;
}
/* Start trying to bring the interface up. */
fork_exec(FALSE, IFUP_PPP, "daemon", device, boot);
while (TRUE) {
/* Wait for a signal. */
if (!theSigterm &&
!theSigint &&
!theSighup &&
!theSigio &&
!theSigchld &&
!theSigalrm) {
sigsuspend(&unblockedsigs);
}
/* If we got SIGTERM or SIGINT, give up and hang up. */
if (theSigterm || theSigint) {
theSigterm = theSigint = 0;
/* If we've already tried to exit this way, use SIGKILL instead
* of SIGTERM, because pppd's just being stubborn. */
if (dying) {
sendsig = SIGKILL;
} else {
sendsig = SIGTERM;
}
dying = TRUE;
/* Get the pid of our child pppd. */
pppLogicalToPhysical(&pppdPid, device, NULL);
/* We don't know what our child pid is. This is very confusing. */
if (!pppdPid) {
failureExit(35);
}
/* Die, pppd, die. */
kill(pppdPid, sendsig);
if (sendsig == SIGKILL) {
kill(-pppdPid, SIGTERM); /* Give it a chance to die nicely, then
kill its whole process group. */
usleep(2500000);
kill(-pppdPid, sendsig);
hangup(ifcfg);
failureExit(32);
}
}
/* If we got SIGHUP, reload and redial. */
if (theSighup) {
theSighup = 0;
/* Free and reload the configuration structure. */
if (ifcfg->parent)
svCloseFile(ifcfg->parent);
svCloseFile(ifcfg);
ifcfg = shvarfilesGet(device);
/* Get the PID of our child pppd. */
pppLogicalToPhysical(&pppdPid, device, NULL);
kill(pppdPid, SIGTERM);
/* We'll redial when the SIGCHLD arrives, even if PERSIST is
* not set (the latter handled by clearing the "we've connected
* at least once" flag). */
connectedOnce = FALSE;
/* We don't want to delay before redialing, either, so cut
* the retry timeout to zero. */
timeout = 0;
}
/* If we got a SIGIO (from netreport, presumably), check if the
* interface is up and return zero (via our parent) if it is. */
if (theSigio) {
theSigio = 0;
pppLogicalToPhysical(NULL, device, &physicalDevice);
if (physicalDevice) {
if (interfaceIsUp(physicalDevice)) {
/* The interface is up, so report a success to a parent if
* we have one. Any errors after this we just swallow. */
relay_exitcode(0);
connectedOnce = TRUE;
alarm(0);
}
free(physicalDevice);
}
}
/* If we got a SIGCHLD, then pppd died (possibly because we killed it),
* and we need to restart it after timeout seconds. */
if (theSigchld) {
theSigchld = 0;
/* Find its pid, which is also its process group ID. */
waited = waitpid(-1, &status, 0);
if (waited == -1) {
continue;
}
/* Now, we need to kill any children of pppd still in pppd's
* process group, in case they are hanging around.
* pppd is dead (we just waited for it) but there is no
* guarantee that its children are dead, and they will
* hold the modem if we do not get rid of them.
* We have kept the old pid/pgrp around in pppdPid. */
if (pppdPid) {
kill(-pppdPid, SIGTERM); /* give it a chance to die nicely */
usleep(2500000);
kill(-pppdPid, SIGKILL);
hangup(ifcfg);
}
pppdPid = 0;
/* Bail if the child exitted abnormally or we were already
* signalled to kill it. */
if (!WIFEXITED(status)) {
failureExit(29);
}
if (dying) {
failureExit(WEXITSTATUS(status));
}
/* Error conditions from which we do not expect to recover
* without user intervention -- do not fill up the logs. */
switch (WEXITSTATUS(status)) {
case 1: case 2: case 3: case 4: case 6:
case 7: case 9: case 14: case 17:
failureExit(WEXITSTATUS(status));
break;
default:
break;
}
/* PGB 08/20/02: We no longer retry connecting MAXFAIL
times on a failed connect script unless RETRYCONNECT is
true. */
if ((WEXITSTATUS(status) == 8) &&
!svTrueValue(ifcfg, "RETRYCONNECT", FALSE)) {
failureExit(WEXITSTATUS(status));
}
/* If we've never connected, or PERSIST is set, dial again, up
* to MAXFAIL times. */
if ((WEXITSTATUS(status) == 8) ||
!connectedOnce ||
svTrueValue(ifcfg, "PERSIST", FALSE)) {
/* If we've been connected (i.e., if we didn't force a redial,
* but the connection went down) wait for DISCONNECTTIMEOUT
* seconds before redialing. */
if (connectedOnce) {
connectedOnce = FALSE;
temp = svGetValue(ifcfg, "DISCONNECTTIMEOUT");
if (temp) {
timeout = atoi(temp);
free(temp);
} else {
timeout = 2;
}
}
sigprocmask(SIG_UNBLOCK, &blockedsigs, NULL);
sleep(timeout);
sigprocmask(SIG_BLOCK, &blockedsigs, NULL);
if (!theSigterm &&
!theSigint &&
!theSighup &&
!theSigio &&
!theSigchld &&
!theSigalrm) {
fork_exec(FALSE, IFUP_PPP, "daemon", device, boot);
}
/* Reinitialize the retry timeout. */
temp = svGetValue(ifcfg, "RETRYTIMEOUT");
if (temp) {
timeout = atoi(temp);
free(temp);
} else {
timeout = 30;
}
// Scott Sharkey <*****@*****.**>
// MAXFAIL Patch...
temp = svGetValue(ifcfg, "MAXFAIL");
if (temp) {
maxfail = atoi(temp);
free(temp);
} else {
maxfail = 0;
}
if ( maxfail != 0 ) {
dialCount++;
if ( dialCount >= maxfail )
failureExit(WEXITSTATUS(status));
}
} else {
failureExit(WEXITSTATUS(status));
}
}
/* We timed out, and we're running at boot-time. */
if (theSigalrm) {
failureExit(34);
}
}
}
