2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 static char rcsid[] = "$FreeBSD$";
36 #include <sys/param.h>
37 #include <sys/types.h>
40 #include <sys/resource.h>
42 #include <sys/socket.h>
52 #include "pathnames.h"
53 #include "patchlevel.h"
60 extern char *strerror();
65 #endif /* IPX_CHANGE */
71 char ifname[32]; /* Interface name */
72 int ifunit; /* Interface unit number */
74 char *progname; /* Name of this program */
75 char hostname[MAXNAMELEN]; /* Our hostname */
76 static char pidfilename[MAXPATHLEN]; /* name of pid file */
77 static char iffilename[MAXPATHLEN]; /* name of if file */
78 static char default_devnam[MAXPATHLEN]; /* name of default device */
79 static pid_t pid; /* Our pid */
80 static uid_t uid; /* Our real user-id */
81 time_t etime,stime; /* End and Start time */
82 int minutes; /* connection duration */
83 static int conn_running; /* we have a [dis]connector running */
85 int ttyfd = -1; /* Serial port file descriptor */
86 mode_t tty_mode = -1; /* Original access permissions to tty */
87 int baud_rate; /* Actual bits/second for serial device */
88 int hungup; /* terminal has been hung up */
89 int privileged; /* we're running as real uid root */
90 int need_holdoff; /* need holdoff period before restarting */
91 int detached; /* have detached from terminal */
93 int phase; /* where the link is at */
97 char **script_env; /* Env. variable values for scripts */
98 int s_env_nalloc; /* # words avail at script_env */
100 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
101 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
103 static int n_children; /* # child processes still running */
105 static int locked; /* lock() has succeeded */
107 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
109 /* Prototypes for procedures local to this file. */
111 static void create_pidfile __P((void));
112 static void cleanup __P((void));
113 static void close_tty __P((void));
114 static void get_input __P((void));
115 static void calltimeout __P((void));
116 static struct timeval *timeleft __P((struct timeval *));
117 static void kill_my_pg __P((int));
118 static void hup __P((int));
119 static void term __P((int));
120 static void chld __P((int));
121 static void toggle_debug __P((int));
122 static void open_ccp __P((int));
123 static void bad_signal __P((int));
124 static void holdoff_end __P((void *));
125 static int device_script __P((char *, int, int));
126 static void reap_kids __P((void));
127 static void pr_log __P((void *, char *, ...));
129 extern char *ttyname __P((int));
130 extern char *getlogin __P((void));
131 int main __P((int, char *[]));
135 #define O_NONBLOCK O_NDELAY
139 #define setlogmask(x)
143 * PPP Data Link Layer "protocol" table.
144 * One entry per supported protocol.
145 * The last entry must be NULL.
147 struct protent *protocols[] = {
177 struct protent *protp;
179 int connect_attempts = 0;
182 phase = PHASE_INITIALIZE;
186 strcpy(default_devnam, devnam);
190 /* Initialize syslog facilities */
192 openlog("pppd", LOG_PID);
194 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
195 setlogmask(LOG_UPTO(LOG_INFO));
198 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
199 option_error("Couldn't get hostname: %m");
202 hostname[MAXNAMELEN-1] = 0;
205 privileged = uid == 0;
206 sprintf(numbuf, "%d", uid);
207 script_setenv("UID", numbuf);
210 * Initialize to the standard option set, then parse, in order,
211 * the system options file, the user's options file,
212 * the tty's options file, and the command line arguments.
214 for (i = 0; (protp = protocols[i]) != NULL; ++i)
219 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
220 || !options_from_user())
222 scan_args(argc-1, argv+1); /* look for tty name on command line */
223 if (!options_for_tty()
224 || !parse_args(argc-1, argv+1))
228 * Check that we are running as root.
230 if (geteuid() != 0) {
231 option_error("must be root to run %s, since it is not setuid-root",
236 if (!ppp_available()) {
237 option_error(no_ppp_msg);
242 * Check that the options given are valid and consistent.
245 auth_check_options();
246 for (i = 0; (protp = protocols[i]) != NULL; ++i)
247 if (protp->check_options != NULL)
248 (*protp->check_options)();
249 if (demand && connector == 0) {
250 option_error("connect script required for demand-dialling\n");
254 script_setenv("DEVICE", devnam);
255 sprintf(numbuf, "%d", baud_rate);
256 script_setenv("SPEED", numbuf);
259 * If the user has specified the default device name explicitly,
260 * pretend they hadn't.
262 if (!default_device && strcmp(devnam, default_devnam) == 0)
268 * Initialize system-dependent stuff and magic number package.
273 setlogmask(LOG_UPTO(LOG_DEBUG));
276 * Detach ourselves from the terminal, if required,
277 * and identify who is running us.
283 stime = time((time_t *) NULL);
286 if (pw != NULL && pw->pw_name != NULL)
291 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
292 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
295 * Compute mask of all interesting signals and install signal handlers
296 * for each. Only one signal handler may be active at a time. Therefore,
297 * all other signals should be masked when any handler is executing.
300 sigaddset(&mask, SIGHUP);
301 sigaddset(&mask, SIGINT);
302 sigaddset(&mask, SIGTERM);
303 sigaddset(&mask, SIGCHLD);
305 #define SIGNAL(s, handler) { \
306 sa.sa_handler = handler; \
307 if (sigaction(s, &sa, NULL) < 0) { \
308 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
315 SIGNAL(SIGHUP, hup); /* Hangup */
316 SIGNAL(SIGINT, term); /* Interrupt */
317 SIGNAL(SIGTERM, term); /* Terminate */
318 SIGNAL(SIGCHLD, chld);
320 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
321 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
324 * Install a handler for other signals which would otherwise
325 * cause pppd to exit without cleaning up.
327 SIGNAL(SIGABRT, bad_signal);
328 SIGNAL(SIGALRM, bad_signal);
329 SIGNAL(SIGFPE, bad_signal);
330 SIGNAL(SIGILL, bad_signal);
331 SIGNAL(SIGPIPE, bad_signal);
332 SIGNAL(SIGQUIT, bad_signal);
333 SIGNAL(SIGSEGV, bad_signal);
335 SIGNAL(SIGBUS, bad_signal);
338 SIGNAL(SIGEMT, bad_signal);
341 SIGNAL(SIGPOLL, bad_signal);
344 SIGNAL(SIGPROF, bad_signal);
347 SIGNAL(SIGSYS, bad_signal);
350 SIGNAL(SIGTRAP, bad_signal);
353 SIGNAL(SIGVTALRM, bad_signal);
356 SIGNAL(SIGXCPU, bad_signal);
359 SIGNAL(SIGXFSZ, bad_signal);
363 * Apparently we can get a SIGPIPE when we call syslog, if
364 * syslogd has died and been restarted. Ignoring it seems
367 signal(SIGPIPE, SIG_IGN);
370 * If we're doing dial-on-demand, set up the interface now.
374 * Open the loopback channel and set it up to be the ppp interface.
378 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
379 (void) sprintf(ifname, "ppp%d", ifunit);
380 script_setenv("IFNAME", ifname);
382 create_pidfile(); /* write pid to file */
385 * Configure the interface and mark it up, etc.
396 * Don't do anything until we see some activity.
398 phase = PHASE_DORMANT;
402 wait_loop_output(timeleft(&timo));
409 if (get_loop_output())
415 * Now we want to bring up the link.
418 syslog(LOG_INFO, "Starting link");
422 * Lock the device if we've been asked to.
424 if (lockflag && !default_device) {
425 if (lock(devnam) < 0)
431 * Open the serial device and set it up to be the ppp interface.
432 * First we open it in non-blocking mode so we can set the
433 * various termios flags appropriately. If we aren't dialling
434 * out and we want to use the modem lines, we reopen it later
435 * in order to wait for the carrier detect signal from the modem.
437 while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
439 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
440 if (!persist || errno != EINTR)
443 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
444 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
446 "Couldn't reset non-blocking mode on device: %m");
452 * Do the equivalent of `mesg n' to stop broadcast messages.
454 if (fstat(ttyfd, &statbuf) < 0
455 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
457 "Couldn't restrict write permissions to %s: %m", devnam);
459 tty_mode = statbuf.st_mode;
461 /* run connection script */
462 if (connector && connector[0]) {
463 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
466 * Set line speed, flow control, etc.
467 * On most systems we set CLOCAL for now so that we can talk
468 * to the modem before carrier comes up. But this has the
469 * side effect that we might miss it if CD drops before we
470 * get to clear CLOCAL below. On systems where we can talk
471 * successfully to the modem with CLOCAL clear and CD down,
472 * we can clear CLOCAL at this point.
474 set_up_tty(ttyfd, 1);
476 /* drop dtr to hang up in case modem is off hook */
477 if (!default_device && modem) {
478 setdtr(ttyfd, FALSE);
483 if (device_script(connector, ttyfd, ttyfd) < 0) {
484 syslog(LOG_ERR, "Connect script failed");
485 setdtr(ttyfd, FALSE);
491 syslog(LOG_INFO, "Serial connection established.");
492 sleep(1); /* give it time to set up its terminal */
495 connect_attempts = 0; /* we made it through ok */
497 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
498 set_up_tty(ttyfd, 0);
500 /* reopen tty if necessary to wait for carrier */
501 if (connector == NULL && modem) {
502 while ((i = open(devnam, O_RDWR)) < 0) {
504 syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
505 if (!persist || errno != EINTR ||
512 /* run welcome script, if any */
513 if (welcomer && welcomer[0]) {
514 if (device_script(welcomer, ttyfd, ttyfd) < 0)
515 syslog(LOG_WARNING, "Welcome script failed");
518 /* set up the serial device as a ppp interface */
519 establish_ppp(ttyfd);
523 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
524 (void) sprintf(ifname, "ppp%d", ifunit);
526 create_pidfile(); /* write pid to file */
528 /* write interface unit number to file */
529 for (n = strlen(devnam); n > 0 ; n--)
530 if (devnam[n] == '/') {
534 (void) sprintf(iffilename, "%s%s.if", _PATH_VARRUN, &devnam[n]);
535 if ((iffile = fopen(iffilename, "w")) != NULL) {
536 fprintf(iffile, "ppp%d\n", ifunit);
537 (void) fclose(iffile);
539 syslog(LOG_ERR, "Failed to create if file %s: %m", iffilename);
543 script_setenv("IFNAME", ifname);
547 * Start opening the connection and wait for
548 * incoming events (reply, timeout, etc.).
550 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
551 stime = time((time_t *) NULL);
553 lcp_open(0); /* Start protocol */
554 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
555 wait_input(timeleft(&timo));
559 lcp_close(0, "User request");
563 if (phase == PHASE_NETWORK) {
564 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
565 (*ccp_protent.open)(0);
569 reap_kids(); /* Don't leave dead kids lying around */
573 * If we may want to bring the link up again, transfer
574 * the ppp unit back to the loopback. Set the
575 * real serial device back to its normal mode of operation.
580 disestablish_ppp(ttyfd);
583 * Run disconnector script, if requested.
584 * XXX we may not be able to do this if the line has hung up!
586 if (disconnector && !hungup) {
587 set_up_tty(ttyfd, 1);
588 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
589 syslog(LOG_WARNING, "disconnect script failed");
591 syslog(LOG_INFO, "Serial link disconnected.");
604 if (pidfilename[0] != 0
605 && unlink(pidfilename) < 0 && errno != ENOENT)
606 syslog(LOG_WARNING, "unable to delete pid file: %m");
610 if (unlink(iffilename) < 0 && errno != ENOENT)
611 syslog(LOG_WARNING, "unable to delete if file: %m");
615 /* limit to retries? */
616 if (max_con_attempts)
617 if (connect_attempts >= max_con_attempts)
625 if (holdoff > 0 && need_holdoff) {
626 phase = PHASE_HOLDOFF;
627 TIMEOUT(holdoff_end, NULL, holdoff);
629 wait_time(timeleft(&timo));
635 phase = PHASE_DORMANT; /* allow signal to end holdoff */
638 } while (phase == PHASE_HOLDOFF);
647 * detach - detach us from the controlling terminal.
654 if (daemon(0, 0) < 0) {
655 perror("Couldn't detach from controlling terminal");
660 /* update pid file if it has been written already */
666 * Create a file containing our process ID.
673 (void) sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
674 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
675 fprintf(pidfile, "%d\n", pid);
676 (void) fclose(pidfile);
678 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
684 * holdoff_end - called via a timeout when the holdoff period ends.
690 phase = PHASE_DORMANT;
694 * get_input - called when incoming data is available.
702 struct protent *protp;
704 p = inpacket_buf; /* point to beginning of packet buffer */
706 len = read_packet(inpacket_buf);
711 etime = time((time_t *) NULL);
712 minutes = (etime-stime)/60;
713 syslog(LOG_NOTICE, "Modem hangup, connected for %d minutes", (minutes >1) ? minutes : 1);
715 lcp_lowerdown(0); /* serial link is no longer available */
720 if (debug /*&& (debugflags & DBG_INPACKET)*/)
721 log_packet(p, len, "rcvd ", LOG_DEBUG);
723 if (len < PPP_HDRLEN) {
724 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
728 p += 2; /* Skip address and control */
729 GETSHORT(protocol, p);
733 * Toss all non-LCP packets unless LCP is OPEN.
735 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
737 "get_input: Received non-LCP packet when LCP not open."));
742 * Until we get past the authentication phase, toss all packets
743 * except LCP, LQR and authentication packets.
745 if (phase <= PHASE_AUTHENTICATE
746 && !(protocol == PPP_LCP || protocol == PPP_LQR
747 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
748 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
754 * Upcall the proper protocol input routine.
756 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
757 if (protp->protocol == protocol && protp->enabled_flag) {
758 (*protp->input)(0, p, len);
761 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
762 && protp->datainput != NULL) {
763 (*protp->datainput)(0, p, len);
769 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
770 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
775 * quit - Clean up state and exit (with an error indication).
784 * die - like quit, except we can specify an exit status.
791 syslog(LOG_INFO, "Exit.");
796 * cleanup - restore anything which needs to be restored before we exit
807 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
808 syslog(LOG_WARNING, "unable to delete pid file: %m");
816 * close_tty - restore the terminal device and close it.
821 disestablish_ppp(ttyfd);
823 /* drop dtr to hang up */
825 setdtr(ttyfd, FALSE);
827 * This sleep is in case the serial port has CLOCAL set by default,
828 * and consequently will reassert DTR when we close the device.
835 if (tty_mode != (mode_t) -1)
836 chmod(devnam, tty_mode);
844 struct timeval c_time; /* time at which to call routine */
845 void *c_arg; /* argument to routine */
846 void (*c_func) __P((void *)); /* routine */
847 struct callout *c_next;
850 static struct callout *callout = NULL; /* Callout list */
851 static struct timeval timenow; /* Current time */
854 * timeout - Schedule a timeout.
856 * Note that this timeout takes the number of seconds, NOT hz (as in
860 timeout(func, arg, time)
861 void (*func) __P((void *));
865 struct callout *newp, *p, **pp;
867 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
868 (long) func, (long) arg, time));
873 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
874 syslog(LOG_ERR, "Out of memory in timeout()!");
879 gettimeofday(&timenow, NULL);
880 newp->c_time.tv_sec = timenow.tv_sec + time;
881 newp->c_time.tv_usec = timenow.tv_usec;
884 * Find correct place and link it in.
886 for (pp = &callout; (p = *pp); pp = &p->c_next)
887 if (newp->c_time.tv_sec < p->c_time.tv_sec
888 || (newp->c_time.tv_sec == p->c_time.tv_sec
889 && newp->c_time.tv_usec < p->c_time.tv_sec))
897 * untimeout - Unschedule a timeout.
901 void (*func) __P((void *));
904 struct callout **copp, *freep;
906 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
909 * Find first matching timeout and remove it from the list.
911 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
912 if (freep->c_func == func && freep->c_arg == arg) {
913 *copp = freep->c_next;
914 (void) free((char *) freep);
921 * calltimeout - Call any timeout routines which are now due.
928 while (callout != NULL) {
931 if (gettimeofday(&timenow, NULL) < 0) {
932 syslog(LOG_ERR, "Failed to get time of day: %m");
935 if (!(p->c_time.tv_sec < timenow.tv_sec
936 || (p->c_time.tv_sec == timenow.tv_sec
937 && p->c_time.tv_usec <= timenow.tv_usec)))
938 break; /* no, it's not time yet */
941 (*p->c_func)(p->c_arg);
949 * timeleft - return the length of time until the next timeout is due.
951 static struct timeval *
958 gettimeofday(&timenow, NULL);
959 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
960 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
961 if (tvp->tv_usec < 0) {
962 tvp->tv_usec += 1000000;
966 tvp->tv_sec = tvp->tv_usec = 0;
973 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
979 struct sigaction act, oldact;
981 act.sa_handler = SIG_IGN;
984 sigaction(sig, &act, &oldact);
985 sigaction(sig, &oldact, NULL);
990 * hup - Catch SIGHUP signal.
992 * Indicates that the physical layer has been disconnected.
993 * We don't rely on this indication; if the user has sent this
994 * signal, we just take the link down.
1000 syslog(LOG_INFO, "Hangup (SIGHUP)");
1003 /* Send the signal to the [dis]connector process(es) also */
1009 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1011 * Indicates that we should initiate a graceful disconnect and exit.
1018 syslog(LOG_INFO, "Terminating on signal %d.", sig);
1019 persist = 0; /* don't try to restart */
1022 /* Send the signal to the [dis]connector process(es) also */
1028 * chld - Catch SIGCHLD signal.
1029 * Calls reap_kids to get status for any dead kids.
1040 * toggle_debug - Catch SIGUSR1 signal.
1042 * Toggle debug flag.
1051 setlogmask(LOG_UPTO(LOG_DEBUG));
1053 setlogmask(LOG_UPTO(LOG_WARNING));
1059 * open_ccp - Catch SIGUSR2 signal.
1061 * Try to (re)negotiate compression.
1073 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1079 static int crashed = 0;
1084 syslog(LOG_ERR, "Fatal signal %d", sig);
1086 kill_my_pg(SIGTERM);
1092 * device_script - run a program to connect or disconnect the
1096 device_script(program, in, out)
1109 syslog(LOG_ERR, "Failed to create child process: %m");
1134 if (nodetach == 0) {
1136 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1137 if (errfd >= 0 && errfd != 2) {
1144 execl("/bin/sh", "sh", "-c", program, (char *)0);
1145 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1150 while (waitpid(pid, &status, 0) < 0) {
1153 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1158 return (status == 0 ? 0 : -1);
1163 * run-program - execute a program with given arguments,
1164 * but don't wait for it.
1165 * If the program can't be executed, logs an error unless
1166 * must_exist is 0 and the program file doesn't exist.
1169 run_program(prog, args, must_exist)
1178 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1184 /* Leave the current location */
1185 (void) setsid(); /* No controlling tty. */
1186 (void) umask (S_IRWXG|S_IRWXO);
1187 (void) chdir ("/"); /* no current directory. */
1191 /* Ensure that nothing of our device environment is inherited. */
1197 close (ttyfd); /* tty interface to the ppp device */
1199 /* Don't pass handles to the PPP device, even by accident. */
1200 new_fd = open (_PATH_DEVNULL, O_RDWR);
1203 dup2 (new_fd, 0); /* stdin <- /dev/null */
1206 dup2 (0, 1); /* stdout -> /dev/null */
1207 dup2 (0, 2); /* stderr -> /dev/null */
1211 /* Force the priority back to zero if pppd is running higher. */
1212 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1213 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1216 /* SysV recommends a second fork at this point. */
1218 /* run the program; give it a null environment */
1219 execve(prog, args, script_env);
1220 if (must_exist || errno != ENOENT)
1221 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1224 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1231 * reap_kids - get status from any dead child processes,
1232 * and log a message for abnormal terminations.
1239 if (n_children == 0)
1241 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1242 if (errno != ECHILD)
1243 syslog(LOG_ERR, "Error waiting for child process: %m");
1248 if (WIFSIGNALED(status)) {
1249 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1250 pid, WTERMSIG(status));
1257 * log_packet - format a packet and log it.
1260 char line[256]; /* line to be logged accumulated here */
1264 log_packet(p, len, prefix, level)
1270 strcpy(line, prefix);
1271 linep = line + strlen(line);
1272 format_packet(p, len, pr_log, NULL);
1274 syslog(level, "%s", line);
1278 * format_packet - make a readable representation of a packet,
1279 * calling `printer(arg, format, ...)' to output it.
1282 format_packet(p, len, printer, arg)
1285 void (*printer) __P((void *, char *, ...));
1291 struct protent *protp;
1293 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1297 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1298 if (proto == protp->protocol)
1300 if (protp != NULL) {
1301 printer(arg, "[%s", protp->name);
1302 n = (*protp->printpkt)(p, len, printer, arg);
1307 printer(arg, "[proto=0x%x]", proto);
1311 for (; len > 0; --len) {
1313 printer(arg, " %.2x", x);
1318 pr_log __V((void *arg, char *fmt, ...))
1325 va_start(pvar, fmt);
1330 arg = va_arg(pvar, void *);
1331 fmt = va_arg(pvar, char *);
1334 n = vfmtmsg(buf, sizeof(buf), fmt, pvar);
1337 if (linep + n + 1 > line + sizeof(line)) {
1338 syslog(LOG_DEBUG, "%s", line);
1346 * print_string - print a readable representation of a string using
1350 print_string(p, len, printer, arg)
1353 void (*printer) __P((void *, char *, ...));
1359 for (; len > 0; --len) {
1361 if (' ' <= c && c <= '~') {
1362 if (c == '\\' || c == '"')
1364 printer(arg, "%c", c);
1368 printer(arg, "\\n");
1371 printer(arg, "\\r");
1374 printer(arg, "\\t");
1377 printer(arg, "\\%.3o", c);
1385 * novm - log an error message saying we ran out of memory, and die.
1391 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1396 * fmtmsg - format a message into a buffer. Like sprintf except we
1397 * also specify the length of the output buffer, and we handle
1398 * %r (recursive format), %m (error message) and %I (IP address) formats.
1399 * Doesn't do floating-point formats.
1400 * Returns the number of chars put into buf.
1403 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1409 va_start(args, fmt);
1415 buf = va_arg(args, char *);
1416 buflen = va_arg(args, int);
1417 fmt = va_arg(args, char *);
1419 n = vfmtmsg(buf, buflen, fmt, args);
1425 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1427 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1430 vfmtmsg(buf, buflen, fmt, args)
1437 int width, prec, fillch;
1438 int base, len, neg, quoted;
1439 unsigned long val = 0;
1440 char *str, *f, *buf0;
1444 static char hexchars[] = "0123456789abcdef";
1448 while (buflen > 0) {
1449 for (f = fmt; *f != '%' && *f != 0; ++f)
1455 memcpy(buf, fmt, len);
1470 width = va_arg(args, int);
1473 while (isdigit(c)) {
1474 width = width * 10 + c - '0';
1481 prec = va_arg(args, int);
1484 while (isdigit(c)) {
1485 prec = prec * 10 + c - '0';
1496 i = va_arg(args, int);
1505 val = va_arg(args, unsigned int);
1509 val = va_arg(args, unsigned int);
1513 val = (unsigned long) va_arg(args, void *);
1518 str = va_arg(args, char *);
1521 num[0] = va_arg(args, int);
1526 str = strerror(errno);
1529 str = ip_ntoa(va_arg(args, u_int32_t));
1532 f = va_arg(args, char *);
1534 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
1536 /* On the powerpc, a va_list is an array of 1 structure */
1537 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
1545 str += 4; /* chop off the day name */
1546 str[15] = 0; /* chop off year and newline */
1548 case 'v': /* "visible" string */
1549 case 'q': /* quoted string */
1551 p = va_arg(args, unsigned char *);
1552 if (fillch == '0' && prec > 0) {
1555 n = strlen((char *)p);
1556 if (prec > 0 && prec < n)
1559 while (n > 0 && buflen > 0) {
1562 if (!quoted && c >= 0x80) {
1567 if (quoted && (c == '"' || c == '\\'))
1569 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1573 case '\t': OUTCHAR('t'); break;
1574 case '\n': OUTCHAR('n'); break;
1575 case '\b': OUTCHAR('b'); break;
1576 case '\f': OUTCHAR('f'); break;
1579 OUTCHAR(hexchars[c >> 4]);
1580 OUTCHAR(hexchars[c & 0xf]);
1597 --fmt; /* so %z outputs %z etc. */
1602 str = num + sizeof(num);
1604 while (str > num + neg) {
1605 *--str = hexchars[val % base];
1607 if (--prec <= 0 && val == 0)
1619 len = num + sizeof(num) - 1 - str;
1622 if (prec > 0 && len > prec)
1628 if ((n = width - len) > 0) {
1636 memcpy(buf, str, len);
1645 * script_setenv - set an environment variable value to be used
1646 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1649 script_setenv(var, value)
1652 int vl = strlen(var);
1654 char *p, *newstring;
1656 newstring = (char *) malloc(vl + strlen(value) + 2);
1659 strcpy(newstring, var);
1660 newstring[vl] = '=';
1661 strcpy(newstring+vl+1, value);
1663 /* check if this variable is already set */
1664 if (script_env != 0) {
1665 for (i = 0; (p = script_env[i]) != 0; ++i) {
1666 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1668 script_env[i] = newstring;
1674 script_env = (char **) malloc(16 * sizeof(char *));
1675 if (script_env == 0)
1680 /* reallocate script_env with more space if needed */
1681 if (i + 1 >= s_env_nalloc) {
1683 char **newenv = (char **) realloc((void *)script_env,
1684 new_n * sizeof(char *));
1687 script_env = newenv;
1688 s_env_nalloc = new_n;
1691 script_env[i] = newstring;
1692 script_env[i+1] = 0;
1696 * script_unsetenv - remove a variable from the environment
1700 script_unsetenv(var)
1703 int vl = strlen(var);
1707 if (script_env == 0)
1709 for (i = 0; (p = script_env[i]) != 0; ++i) {
1710 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1712 while ((script_env[i] = script_env[i+1]) != 0)