*/
#ifndef lint
-static char rcsid[] = "$Id: main.c,v 1.47 1998/03/30 06:25:34 paulus Exp $";
+static char rcsid[] = "$Id: main.c,v 1.51 1998/11/07 06:59:28 paulus Exp $";
#endif
#include <stdio.h>
#include <netdb.h>
#include <utmp.h>
#include <pwd.h>
+#include <setjmp.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/wait.h>
int kill_link;
int open_ccp_flag;
+static int waiting;
+static jmp_buf sigjmp;
+
char **script_env; /* Env. variable values for scripts */
int s_env_nalloc; /* # words avail at script_env */
if (gethostname(hostname, MAXNAMELEN) < 0 ) {
option_error("Couldn't get hostname: %m");
- die(1);
+ exit(1);
}
hostname[MAXNAMELEN-1] = 0;
uid = getuid();
privileged = uid == 0;
sprintf(numbuf, "%d", uid);
- script_setenv("UID", numbuf);
+ script_setenv("ORIG_UID", numbuf);
/*
* Initialize to the standard option set, then parse, in order,
if (geteuid() != 0) {
option_error("must be root to run %s, since it is not setuid-root",
argv[0]);
- die(1);
+ exit(1);
}
if (!ppp_available()) {
/*
* Check that the options given are valid and consistent.
*/
- sys_check_options();
+ if (!sys_check_options())
+ exit(1);
auth_check_options();
for (i = 0; (protp = protocols[i]) != NULL; ++i)
if (protp->check_options != NULL)
(*protp->check_options)();
if (demand && connector == 0) {
- option_error("connect script required for demand-dialling\n");
+ option_error("connect script is required for demand-dialling\n");
exit(1);
}
* Detach ourselves from the terminal, if required,
* and identify who is running us.
*/
- if (nodetach == 0)
+ if (!nodetach && !updetach)
detach();
pid = getpid();
p = getlogin();
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
sigaddset(&mask, SIGCHLD);
+ sigaddset(&mask, SIGUSR2);
#define SIGNAL(s, handler) { \
sa.sa_handler = handler; \
if (sigaction(s, &sa, NULL) < 0) { \
syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
- die(1); \
+ exit(1); \
} \
}
*/
signal(SIGPIPE, SIG_IGN);
+ waiting = 0;
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+
/*
* If we're doing dial-on-demand, set up the interface now.
*/
kill_link = 0;
demand_unblock();
for (;;) {
- wait_loop_output(timeleft(&timo));
+ if (setjmp(sigjmp) == 0) {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_loop_output(timeleft(&timo));
+ }
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ waiting = 0;
calltimeout();
if (kill_link) {
if (!persist)
- die(0);
+ break;
kill_link = 0;
}
if (get_loop_output())
break;
reap_kids();
}
+ if (kill_link)
+ break;
/*
* Now we want to bring up the link.
* out and we want to use the modem lines, we reopen it later
* in order to wait for the carrier detect signal from the modem.
*/
+ hungup = 0;
+ kill_link = 0;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
if (errno != EINTR)
syslog(LOG_ERR, "Failed to open %s: %m", devnam);
if (!persist || errno != EINTR)
goto fail;
}
+ sigprocmask(SIG_BLOCK, &mask, NULL);
if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
|| fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
syslog(LOG_WARNING,
"Couldn't reset non-blocking mode on device: %m");
- hungup = 0;
- kill_link = 0;
-
/*
* Do the equivalent of `mesg n' to stop broadcast messages.
*/
if (connector && connector[0]) {
MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
+ if (!default_device && modem) {
+ hangup_modem(ttyfd); /* in case modem is off hook */
+ sleep(1);
+ }
+
/*
* Set line speed, flow control, etc.
* On most systems we set CLOCAL for now so that we can talk
* side effect that we might miss it if CD drops before we
* get to clear CLOCAL below. On systems where we can talk
* successfully to the modem with CLOCAL clear and CD down,
- * we can clear CLOCAL at this point.
+ * we could clear CLOCAL at this point.
*/
set_up_tty(ttyfd, 1);
- /* drop dtr to hang up in case modem is off hook */
- if (!default_device && modem) {
- setdtr(ttyfd, FALSE);
- sleep(1);
- setdtr(ttyfd, TRUE);
- }
-
if (device_script(connector, ttyfd, ttyfd) < 0) {
syslog(LOG_ERR, "Connect script failed");
- setdtr(ttyfd, FALSE);
goto fail;
}
-
syslog(LOG_INFO, "Serial connection established.");
sleep(1); /* give it time to set up its terminal */
}
syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
lcp_lowerup(0);
lcp_open(0); /* Start protocol */
+ open_ccp_flag = 0;
for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
- wait_input(timeleft(&timo));
+ if (setjmp(sigjmp) == 0) {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_input(timeleft(&timo));
+ }
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ waiting = 0;
calltimeout();
- get_input();
if (kill_link) {
lcp_close(0, "User request");
kill_link = 0;
}
+ get_input();
if (open_ccp_flag) {
if (phase == PHASE_NETWORK) {
ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
}
if (!persist)
- die(1);
+ break;
if (demand)
demand_discard();
phase = PHASE_HOLDOFF;
TIMEOUT(holdoff_end, NULL, holdoff);
do {
- wait_time(timeleft(&timo));
+ if (setjmp(sigjmp) == 0) {
+ waiting = 1;
+ sigprocmask(SIG_UNBLOCK, &mask, NULL);
+ wait_time(timeleft(&timo));
+ }
+ sigprocmask(SIG_BLOCK, &mask, NULL);
+ waiting = 0;
calltimeout();
if (kill_link) {
- if (!persist)
- die(0);
kill_link = 0;
phase = PHASE_DORMANT; /* allow signal to end holdoff */
}
reap_kids();
} while (phase == PHASE_HOLDOFF);
+ if (!persist)
+ break;
}
}
+ /* Wait for scripts to finish */
+ while (n_children > 0)
+ reap_kids();
+
die(0);
return 0;
}
create_pidfile()
{
FILE *pidfile;
+ char numbuf[16];
(void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
if ((pidfile = fopen(pidfilename, "w")) != NULL) {
syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
pidfilename[0] = 0;
}
+ sprintf(numbuf, "%d", pid);
+ script_setenv("PPPD_PID", numbuf);
}
/*
disestablish_ppp(ttyfd);
/* drop dtr to hang up */
- if (modem) {
- setdtr(ttyfd, FALSE);
+ if (!default_device && modem) {
+ hangup_modem(ttyfd);
/*
* This sleep is in case the serial port has CLOCAL set by default,
* and consequently will reassert DTR when we close the device.
for (pp = &callout; (p = *pp); pp = &p->c_next)
if (newp->c_time.tv_sec < p->c_time.tv_sec
|| (newp->c_time.tv_sec == p->c_time.tv_sec
- && newp->c_time.tv_usec < p->c_time.tv_sec))
+ && newp->c_time.tv_usec < p->c_time.tv_usec))
break;
newp->c_next = p;
*pp = newp;
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
+ if (waiting)
+ longjmp(sigjmp, 1);
}
if (conn_running)
/* Send the signal to the [dis]connector process(es) also */
kill_my_pg(sig);
+ if (waiting)
+ longjmp(sigjmp, 1);
}
chld(sig)
int sig;
{
- reap_kids();
+ if (waiting)
+ longjmp(sigjmp, 1);
}
int sig;
{
open_ccp_flag = 1;
+ if (waiting)
+ longjmp(sigjmp, 1);
}
bad_signal(sig)
int sig;
{
+ static int crashed = 0;
+
+ if (crashed)
+ _exit(127);
+ crashed = 1;
syslog(LOG_ERR, "Fatal signal %d", sig);
if (conn_running)
kill_my_pg(SIGTERM);
close(out);
}
}
- if (nodetach == 0) {
+ if (!nodetach && !updetach) {
close(2);
errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
if (errfd >= 0 && errfd != 2) {
}
+/*
+ * We maintain a list of child process pids and
+ * functions to call when they exit.
+ */
+struct subprocess {
+ pid_t pid;
+ char *prog;
+ void (*done) __P((void *));
+ void *arg;
+ struct subprocess *next;
+};
+
+struct subprocess *children;
+
/*
* run-program - execute a program with given arguments,
* but don't wait for it.
* If the program can't be executed, logs an error unless
* must_exist is 0 and the program file doesn't exist.
+ * Returns -1 if it couldn't fork, 0 if the file doesn't exist
+ * or isn't an executable plain file, or the process ID of the child.
+ * If done != NULL, (*done)(arg) will be called later (within
+ * reap_kids) iff the return value is > 0.
*/
-int
-run_program(prog, args, must_exist)
+pid_t
+run_program(prog, args, must_exist, done, arg)
char *prog;
char **args;
int must_exist;
+ void (*done) __P((void *));
+ void *arg;
{
int pid;
+ struct subprocess *chp;
+ struct stat sbuf;
+
+ /*
+ * First check if the file exists and is executable.
+ * We don't use access() because that would use the
+ * real user-id, which might not be root, and the script
+ * might be accessible only to root.
+ */
+ errno = EINVAL;
+ if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
+ || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
+ if (must_exist || errno != ENOENT)
+ syslog(LOG_WARNING, "Can't execute %s: %m", prog);
+ return 0;
+ }
pid = fork();
if (pid == -1) {
syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
- return -1;
+ die(1);
}
if (pid == 0) {
int new_fd;
/* SysV recommends a second fork at this point. */
- /* run the program; give it a null environment */
+ /* run the program */
execve(prog, args, script_env);
- if (must_exist || errno != ENOENT)
+ if (must_exist || errno != ENOENT) {
+ int i;
syslog(LOG_WARNING, "Can't execute %s: %m", prog);
+ for (i = 0; args[i]; ++i)
+ syslog(LOG_DEBUG, "args[%d] = '%s'", i, args[i]);
+ for (i = 0; script_env[i]; ++i)
+ syslog(LOG_DEBUG, "env[%d] = '%s'", i, script_env[i]);
+ }
_exit(-1);
}
- MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
+
+ if (debug)
+ syslog(LOG_DEBUG, "Script %s started; pid = %d", prog, pid);
++n_children;
- return 0;
+
+ chp = (struct subprocess *) malloc(sizeof(struct subprocess));
+ if (chp == NULL) {
+ syslog(LOG_WARNING, "losing track of %s process", prog);
+ } else {
+ chp->pid = pid;
+ chp->prog = prog;
+ chp->done = done;
+ chp->arg = arg;
+ chp->next = children;
+ children = chp;
+ }
+
+ return pid;
}
reap_kids()
{
int pid, status;
+ struct subprocess *chp, **prevp;
if (n_children == 0)
return;
- if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
- if (errno != ECHILD)
- syslog(LOG_ERR, "Error waiting for child process: %m");
- return;
- }
- if (pid > 0) {
+ while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
--n_children;
+ for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next)
+ if (chp->pid == pid)
+ break;
+ if (debug)
+ syslog(LOG_DEBUG, "process %d (%s) finished, status = 0x%x",
+ pid, (chp? chp->prog: "??"), status);
if (WIFSIGNALED(status)) {
- syslog(LOG_WARNING, "Child process %d terminated with signal %d",
- pid, WTERMSIG(status));
+ syslog(LOG_WARNING,
+ "Child process %s (pid %d) terminated with signal %d",
+ (chp? chp->prog: "??"), pid, WTERMSIG(status));
}
+ if (chp && chp->done)
+ (*chp->done)(chp->arg);
}
+ if (pid == -1 && errno != ECHILD)
+ syslog(LOG_ERR, "Error waiting for child process: %m");
}
fmt = va_arg(pvar, char *);
#endif
- vsprintf(buf, fmt, pvar);
+ n = vfmtmsg(buf, sizeof(buf), fmt, pvar);
va_end(pvar);
- n = strlen(buf);
if (linep + n + 1 > line + sizeof(line)) {
syslog(LOG_DEBUG, "%s", line);
linep = line;
projects / ppp.git / blobdiff