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.
19 * $FreeBSD: src/usr.sbin/pppd/main.c,v 1.19.2.1 2002/07/30 03:50:40 peter Exp $
20 * $DragonFly: src/usr.sbin/pppd/main.c,v 1.4 2004/12/18 22:48:04 swildner Exp $
35 #include <sys/param.h>
36 #include <sys/types.h>
39 #include <sys/resource.h>
41 #include <sys/socket.h>
51 #include "pathnames.h"
52 #include "patchlevel.h"
59 extern char *strerror();
64 #endif /* IPX_CHANGE */
70 char ifname[32]; /* Interface name */
71 int ifunit; /* Interface unit number */
73 char *progname; /* Name of this program */
74 char hostname[MAXNAMELEN]; /* Our hostname */
75 static char pidfilename[MAXPATHLEN]; /* name of pid file */
76 static char iffilename[MAXPATHLEN]; /* name of if file */
77 static char default_devnam[MAXPATHLEN]; /* name of default device */
78 static pid_t pid; /* Our pid */
79 static uid_t uid; /* Our real user-id */
80 time_t etime,stime; /* End and Start time */
81 int minutes; /* connection duration */
82 static int conn_running; /* we have a [dis]connector running */
84 int ttyfd = -1; /* Serial port file descriptor */
85 mode_t tty_mode = -1; /* Original access permissions to tty */
86 int baud_rate; /* Actual bits/second for serial device */
87 int hungup; /* terminal has been hung up */
88 int privileged; /* we're running as real uid root */
89 int need_holdoff; /* need holdoff period before restarting */
90 int detached; /* have detached from terminal */
92 int phase; /* where the link is at */
96 char **script_env; /* Env. variable values for scripts */
97 int s_env_nalloc; /* # words avail at script_env */
99 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
100 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
102 static int n_children; /* # child processes still running */
104 static int locked; /* lock() has succeeded */
106 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
108 /* Prototypes for procedures local to this file. */
110 static void create_pidfile(void);
111 static void cleanup(void);
112 static void close_tty(void);
113 static void get_input(void);
114 static void calltimeout(void);
115 static struct timeval *timeleft(struct timeval *);
116 static void kill_my_pg(int);
117 static void hup(int);
118 static void term(int);
119 static void chld(int);
120 static void toggle_debug(int);
121 static void open_ccp(int);
122 static void bad_signal(int);
123 static void holdoff_end(void *);
124 static int device_script(char *, int, int);
125 static void reap_kids(void);
126 static void pr_log(void *, char *, ...);
128 extern char *ttyname(int);
129 extern char *getlogin(void);
130 int main(int, char *[]);
134 #define O_NONBLOCK O_NDELAY
138 #define setlogmask(x)
142 * PPP Data Link Layer "protocol" table.
143 * One entry per supported protocol.
144 * The last entry must be NULL.
146 struct protent *protocols[] = {
176 struct protent *protp;
178 int connect_attempts = 0;
181 phase = PHASE_INITIALIZE;
185 strcpy(default_devnam, devnam);
189 /* Initialize syslog facilities */
191 openlog("pppd", LOG_PID);
193 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
194 setlogmask(LOG_UPTO(LOG_INFO));
197 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
198 option_error("Couldn't get hostname: %m");
201 hostname[MAXNAMELEN-1] = 0;
204 privileged = uid == 0;
205 sprintf(numbuf, "%d", uid);
206 script_setenv("UID", numbuf);
209 * Initialize to the standard option set, then parse, in order,
210 * the system options file, the user's options file,
211 * the tty's options file, and the command line arguments.
213 for (i = 0; (protp = protocols[i]) != NULL; ++i)
218 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
219 || !options_from_user())
221 scan_args(argc-1, argv+1); /* look for tty name on command line */
222 if (!options_for_tty()
223 || !parse_args(argc-1, argv+1))
227 * Check that we are running as root.
229 if (geteuid() != 0) {
230 option_error("must be root to run %s, since it is not setuid-root",
235 if (!ppp_available()) {
236 option_error(no_ppp_msg);
241 * Check that the options given are valid and consistent.
244 auth_check_options();
245 for (i = 0; (protp = protocols[i]) != NULL; ++i)
246 if (protp->check_options != NULL)
247 (*protp->check_options)();
248 if (demand && connector == 0) {
249 option_error("connect script required for demand-dialling\n");
253 script_setenv("DEVICE", devnam);
254 sprintf(numbuf, "%d", baud_rate);
255 script_setenv("SPEED", numbuf);
258 * If the user has specified the default device name explicitly,
259 * pretend they hadn't.
261 if (!default_device && strcmp(devnam, default_devnam) == 0)
267 * Initialize system-dependent stuff and magic number package.
272 setlogmask(LOG_UPTO(LOG_DEBUG));
275 * Detach ourselves from the terminal, if required,
276 * and identify who is running us.
282 stime = time((time_t *) NULL);
285 if (pw != NULL && pw->pw_name != NULL)
290 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
291 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
294 * Compute mask of all interesting signals and install signal handlers
295 * for each. Only one signal handler may be active at a time. Therefore,
296 * all other signals should be masked when any handler is executing.
299 sigaddset(&mask, SIGHUP);
300 sigaddset(&mask, SIGINT);
301 sigaddset(&mask, SIGTERM);
302 sigaddset(&mask, SIGCHLD);
304 #define SIGNAL(s, handler) { \
305 sa.sa_handler = handler; \
306 if (sigaction(s, &sa, NULL) < 0) { \
307 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
314 SIGNAL(SIGHUP, hup); /* Hangup */
315 SIGNAL(SIGINT, term); /* Interrupt */
316 SIGNAL(SIGTERM, term); /* Terminate */
317 SIGNAL(SIGCHLD, chld);
319 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
320 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
323 * Install a handler for other signals which would otherwise
324 * cause pppd to exit without cleaning up.
326 SIGNAL(SIGABRT, bad_signal);
327 SIGNAL(SIGALRM, bad_signal);
328 SIGNAL(SIGFPE, bad_signal);
329 SIGNAL(SIGILL, bad_signal);
330 SIGNAL(SIGPIPE, bad_signal);
331 SIGNAL(SIGQUIT, bad_signal);
332 SIGNAL(SIGSEGV, bad_signal);
334 SIGNAL(SIGBUS, bad_signal);
337 SIGNAL(SIGEMT, bad_signal);
340 SIGNAL(SIGPOLL, bad_signal);
343 SIGNAL(SIGPROF, bad_signal);
346 SIGNAL(SIGSYS, bad_signal);
349 SIGNAL(SIGTRAP, bad_signal);
352 SIGNAL(SIGVTALRM, bad_signal);
355 SIGNAL(SIGXCPU, bad_signal);
358 SIGNAL(SIGXFSZ, bad_signal);
362 * Apparently we can get a SIGPIPE when we call syslog, if
363 * syslogd has died and been restarted. Ignoring it seems
366 signal(SIGPIPE, SIG_IGN);
369 * If we're doing dial-on-demand, set up the interface now.
373 * Open the loopback channel and set it up to be the ppp interface.
377 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
378 sprintf(ifname, "ppp%d", ifunit);
379 script_setenv("IFNAME", ifname);
381 create_pidfile(); /* write pid to file */
384 * Configure the interface and mark it up, etc.
395 * Don't do anything until we see some activity.
397 phase = PHASE_DORMANT;
401 wait_loop_output(timeleft(&timo));
408 if (get_loop_output())
414 * Now we want to bring up the link.
417 syslog(LOG_INFO, "Starting link");
421 * Lock the device if we've been asked to.
423 if (lockflag && !default_device) {
424 if (lock(devnam) < 0)
430 * Open the serial device and set it up to be the ppp interface.
431 * First we open it in non-blocking mode so we can set the
432 * various termios flags appropriately. If we aren't dialling
433 * out and we want to use the modem lines, we reopen it later
434 * in order to wait for the carrier detect signal from the modem.
436 while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
438 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
439 if (!persist || errno != EINTR)
442 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
443 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
445 "Couldn't reset non-blocking mode on device: %m");
451 * Do the equivalent of `mesg n' to stop broadcast messages.
453 if (fstat(ttyfd, &statbuf) < 0
454 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
456 "Couldn't restrict write permissions to %s: %m", devnam);
458 tty_mode = statbuf.st_mode;
460 /* run connection script */
461 if (connector && connector[0]) {
462 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
465 * Set line speed, flow control, etc.
466 * On most systems we set CLOCAL for now so that we can talk
467 * to the modem before carrier comes up. But this has the
468 * side effect that we might miss it if CD drops before we
469 * get to clear CLOCAL below. On systems where we can talk
470 * successfully to the modem with CLOCAL clear and CD down,
471 * we can clear CLOCAL at this point.
473 set_up_tty(ttyfd, 1);
475 /* drop dtr to hang up in case modem is off hook */
476 if (!default_device && modem) {
477 setdtr(ttyfd, FALSE);
482 if (device_script(connector, ttyfd, ttyfd) < 0) {
483 syslog(LOG_ERR, "Connect script failed");
484 setdtr(ttyfd, FALSE);
490 syslog(LOG_INFO, "Serial connection established.");
491 sleep(1); /* give it time to set up its terminal */
494 connect_attempts = 0; /* we made it through ok */
496 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
497 set_up_tty(ttyfd, 0);
499 /* reopen tty if necessary to wait for carrier */
500 if (connector == NULL && modem) {
501 while ((i = open(devnam, O_RDWR)) < 0) {
503 syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
504 if (!persist || errno != EINTR ||
511 /* run welcome script, if any */
512 if (welcomer && welcomer[0]) {
513 if (device_script(welcomer, ttyfd, ttyfd) < 0)
514 syslog(LOG_WARNING, "Welcome script failed");
517 /* set up the serial device as a ppp interface */
518 establish_ppp(ttyfd);
522 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
523 sprintf(ifname, "ppp%d", ifunit);
525 create_pidfile(); /* write pid to file */
527 /* write interface unit number to file */
528 for (n = strlen(devnam); n > 0 ; n--)
529 if (devnam[n] == '/') {
533 sprintf(iffilename, "%s%s.if", _PATH_VARRUN, &devnam[n]);
534 if ((iffile = fopen(iffilename, "w")) != NULL) {
535 fprintf(iffile, "ppp%d\n", ifunit);
538 syslog(LOG_ERR, "Failed to create if file %s: %m", iffilename);
542 script_setenv("IFNAME", ifname);
546 * Start opening the connection and wait for
547 * incoming events (reply, timeout, etc.).
549 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
550 stime = time((time_t *) NULL);
552 lcp_open(0); /* Start protocol */
553 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
554 wait_input(timeleft(&timo));
558 lcp_close(0, "User request");
562 if (phase == PHASE_NETWORK) {
563 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
564 (*ccp_protent.open)(0);
568 reap_kids(); /* Don't leave dead kids lying around */
572 * If we may want to bring the link up again, transfer
573 * the ppp unit back to the loopback. Set the
574 * real serial device back to its normal mode of operation.
579 disestablish_ppp(ttyfd);
582 * Run disconnector script, if requested.
583 * XXX we may not be able to do this if the line has hung up!
585 if (disconnector && !hungup) {
586 set_up_tty(ttyfd, 1);
587 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
588 syslog(LOG_WARNING, "disconnect script failed");
590 syslog(LOG_INFO, "Serial link disconnected.");
603 if (pidfilename[0] != 0
604 && unlink(pidfilename) < 0 && errno != ENOENT)
605 syslog(LOG_WARNING, "unable to delete pid file: %m");
609 if (unlink(iffilename) < 0 && errno != ENOENT)
610 syslog(LOG_WARNING, "unable to delete if file: %m");
614 /* limit to retries? */
615 if (max_con_attempts)
616 if (connect_attempts >= max_con_attempts)
624 if (holdoff > 0 && need_holdoff) {
625 phase = PHASE_HOLDOFF;
626 TIMEOUT(holdoff_end, NULL, holdoff);
628 wait_time(timeleft(&timo));
634 phase = PHASE_DORMANT; /* allow signal to end holdoff */
637 } while (phase == PHASE_HOLDOFF);
646 * detach - detach us from the controlling terminal.
653 if (daemon(0, 0) < 0) {
654 perror("Couldn't detach from controlling terminal");
659 /* update pid file if it has been written already */
665 * Create a file containing our process ID.
672 sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
673 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
674 fprintf(pidfile, "%d\n", pid);
677 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
683 * holdoff_end - called via a timeout when the holdoff period ends.
689 phase = PHASE_DORMANT;
693 * get_input - called when incoming data is available.
701 struct protent *protp;
703 p = inpacket_buf; /* point to beginning of packet buffer */
705 len = read_packet(inpacket_buf);
710 etime = time((time_t *) NULL);
711 minutes = (etime-stime)/60;
712 syslog(LOG_NOTICE, "Modem hangup, connected for %d minutes", (minutes >1) ? minutes : 1);
714 lcp_lowerdown(0); /* serial link is no longer available */
719 if (debug /*&& (debugflags & DBG_INPACKET)*/)
720 log_packet(p, len, "rcvd ", LOG_DEBUG);
722 if (len < PPP_HDRLEN) {
723 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
727 p += 2; /* Skip address and control */
728 GETSHORT(protocol, p);
732 * Toss all non-LCP packets unless LCP is OPEN.
734 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
736 "get_input: Received non-LCP packet when LCP not open."));
741 * Until we get past the authentication phase, toss all packets
742 * except LCP, LQR and authentication packets.
744 if (phase <= PHASE_AUTHENTICATE
745 && !(protocol == PPP_LCP || protocol == PPP_LQR
746 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
747 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
753 * Upcall the proper protocol input routine.
755 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
756 if (protp->protocol == protocol && protp->enabled_flag) {
757 (*protp->input)(0, p, len);
760 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
761 && protp->datainput != NULL) {
762 (*protp->datainput)(0, p, len);
768 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
769 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
774 * quit - Clean up state and exit (with an error indication).
783 * die - like quit, except we can specify an exit status.
790 syslog(LOG_INFO, "Exit.");
795 * cleanup - restore anything which needs to be restored before we exit
806 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
807 syslog(LOG_WARNING, "unable to delete pid file: %m");
815 * close_tty - restore the terminal device and close it.
820 disestablish_ppp(ttyfd);
822 /* drop dtr to hang up */
824 setdtr(ttyfd, FALSE);
826 * This sleep is in case the serial port has CLOCAL set by default,
827 * and consequently will reassert DTR when we close the device.
834 if (tty_mode != (mode_t) -1)
835 fchmod(ttyfd, tty_mode);
843 struct timeval c_time; /* time at which to call routine */
844 void *c_arg; /* argument to routine */
845 void (*c_func)(void *); /* routine */
846 struct callout *c_next;
849 static struct callout *callout = NULL; /* Callout list */
850 static struct timeval timenow; /* Current time */
853 * timeout - Schedule a timeout.
855 * Note that this timeout takes the number of seconds, NOT hz (as in
859 timeout(func, arg, time)
860 void (*func)(void *);
864 struct callout *newp, *p, **pp;
866 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
867 (long) func, (long) arg, time));
872 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
873 syslog(LOG_ERR, "Out of memory in timeout()!");
878 gettimeofday(&timenow, NULL);
879 newp->c_time.tv_sec = timenow.tv_sec + time;
880 newp->c_time.tv_usec = timenow.tv_usec;
883 * Find correct place and link it in.
885 for (pp = &callout; (p = *pp); pp = &p->c_next)
886 if (newp->c_time.tv_sec < p->c_time.tv_sec
887 || (newp->c_time.tv_sec == p->c_time.tv_sec
888 && newp->c_time.tv_usec < p->c_time.tv_sec))
896 * untimeout - Unschedule a timeout.
900 void (*func)(void *);
903 struct callout **copp, *freep;
905 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
908 * Find first matching timeout and remove it from the list.
910 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
911 if (freep->c_func == func && freep->c_arg == arg) {
912 *copp = freep->c_next;
913 free((char *) freep);
920 * calltimeout - Call any timeout routines which are now due.
927 while (callout != NULL) {
930 if (gettimeofday(&timenow, NULL) < 0) {
931 syslog(LOG_ERR, "Failed to get time of day: %m");
934 if (!(p->c_time.tv_sec < timenow.tv_sec
935 || (p->c_time.tv_sec == timenow.tv_sec
936 && p->c_time.tv_usec <= timenow.tv_usec)))
937 break; /* no, it's not time yet */
940 (*p->c_func)(p->c_arg);
948 * timeleft - return the length of time until the next timeout is due.
950 static struct timeval *
957 gettimeofday(&timenow, NULL);
958 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
959 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
960 if (tvp->tv_usec < 0) {
961 tvp->tv_usec += 1000000;
965 tvp->tv_sec = tvp->tv_usec = 0;
972 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
978 struct sigaction act, oldact;
980 act.sa_handler = SIG_IGN;
983 sigaction(sig, &act, &oldact);
984 sigaction(sig, &oldact, NULL);
989 * hup - Catch SIGHUP signal.
991 * Indicates that the physical layer has been disconnected.
992 * We don't rely on this indication; if the user has sent this
993 * signal, we just take the link down.
999 syslog(LOG_INFO, "Hangup (SIGHUP)");
1002 /* Send the signal to the [dis]connector process(es) also */
1008 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1010 * Indicates that we should initiate a graceful disconnect and exit.
1017 syslog(LOG_INFO, "Terminating on signal %d.", sig);
1018 persist = 0; /* don't try to restart */
1021 /* Send the signal to the [dis]connector process(es) also */
1027 * chld - Catch SIGCHLD signal.
1028 * Calls reap_kids to get status for any dead kids.
1039 * toggle_debug - Catch SIGUSR1 signal.
1041 * Toggle debug flag.
1050 setlogmask(LOG_UPTO(LOG_DEBUG));
1052 setlogmask(LOG_UPTO(LOG_WARNING));
1058 * open_ccp - Catch SIGUSR2 signal.
1060 * Try to (re)negotiate compression.
1072 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1078 static int crashed = 0;
1083 syslog(LOG_ERR, "Fatal signal %d", sig);
1085 kill_my_pg(SIGTERM);
1091 * device_script - run a program to connect or disconnect the
1095 device_script(program, in, out)
1108 syslog(LOG_ERR, "Failed to create child process: %m");
1133 if (nodetach == 0) {
1135 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1136 if (errfd >= 0 && errfd != 2) {
1143 execl("/bin/sh", "sh", "-c", program, (char *)0);
1144 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1149 while (waitpid(pid, &status, 0) < 0) {
1152 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1157 return (status == 0 ? 0 : -1);
1162 * run-program - execute a program with given arguments,
1163 * but don't wait for it.
1164 * If the program can't be executed, logs an error unless
1165 * must_exist is 0 and the program file doesn't exist.
1168 run_program(prog, args, must_exist)
1177 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1183 /* Leave the current location */
1184 setsid(); /* No controlling tty. */
1185 umask (S_IRWXG|S_IRWXO);
1186 chdir ("/"); /* no current directory. */
1190 /* Ensure that nothing of our device environment is inherited. */
1196 close (ttyfd); /* tty interface to the ppp device */
1198 /* Don't pass handles to the PPP device, even by accident. */
1199 new_fd = open (_PATH_DEVNULL, O_RDWR);
1202 dup2 (new_fd, 0); /* stdin <- /dev/null */
1205 dup2 (0, 1); /* stdout -> /dev/null */
1206 dup2 (0, 2); /* stderr -> /dev/null */
1210 /* Force the priority back to zero if pppd is running higher. */
1211 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1212 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1215 /* SysV recommends a second fork at this point. */
1217 /* run the program; give it a null environment */
1218 execve(prog, args, script_env);
1219 if (must_exist || errno != ENOENT)
1220 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1223 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1230 * reap_kids - get status from any dead child processes,
1231 * and log a message for abnormal terminations.
1238 if (n_children == 0)
1240 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1241 if (errno != ECHILD)
1242 syslog(LOG_ERR, "Error waiting for child process: %m");
1247 if (WIFSIGNALED(status)) {
1248 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1249 pid, WTERMSIG(status));
1256 * log_packet - format a packet and log it.
1259 char line[256]; /* line to be logged accumulated here */
1263 log_packet(p, len, prefix, level)
1269 strcpy(line, prefix);
1270 linep = line + strlen(line);
1271 format_packet(p, len, pr_log, NULL);
1273 syslog(level, "%s", line);
1277 * format_packet - make a readable representation of a packet,
1278 * calling `printer(arg, format, ...)' to output it.
1281 format_packet(p, len, printer, arg)
1284 void (*printer)(void *, char *, ...);
1290 struct protent *protp;
1292 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1296 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1297 if (proto == protp->protocol)
1299 if (protp != NULL) {
1300 printer(arg, "[%s", protp->name);
1301 n = (*protp->printpkt)(p, len, printer, arg);
1306 printer(arg, "[proto=0x%x]", proto);
1310 for (; len > 0; --len) {
1312 printer(arg, " %.2x", x);
1317 pr_log __V((void *arg, char *fmt, ...))
1324 va_start(pvar, fmt);
1329 arg = va_arg(pvar, void *);
1330 fmt = va_arg(pvar, char *);
1333 n = vfmtmsg(buf, sizeof(buf), fmt, pvar);
1336 if (linep + n + 1 > line + sizeof(line)) {
1337 syslog(LOG_DEBUG, "%s", line);
1345 * print_string - print a readable representation of a string using
1349 print_string(p, len, printer, arg)
1352 void (*printer)(void *, char *, ...);
1358 for (; len > 0; --len) {
1360 if (' ' <= c && c <= '~') {
1361 if (c == '\\' || c == '"')
1363 printer(arg, "%c", c);
1367 printer(arg, "\\n");
1370 printer(arg, "\\r");
1373 printer(arg, "\\t");
1376 printer(arg, "\\%.3o", c);
1384 * novm - log an error message saying we ran out of memory, and die.
1390 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1395 * fmtmsg - format a message into a buffer. Like sprintf except we
1396 * also specify the length of the output buffer, and we handle
1397 * %r (recursive format), %m (error message) and %I (IP address) formats.
1398 * Doesn't do floating-point formats.
1399 * Returns the number of chars put into buf.
1402 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1408 va_start(args, fmt);
1414 buf = va_arg(args, char *);
1415 buflen = va_arg(args, int);
1416 fmt = va_arg(args, char *);
1418 n = vfmtmsg(buf, buflen, fmt, args);
1424 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1426 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1429 vfmtmsg(buf, buflen, fmt, args)
1436 int width, prec, fillch;
1437 int base, len, neg, quoted;
1438 unsigned long val = 0;
1439 char *str, *f, *buf0;
1443 static char hexchars[] = "0123456789abcdef";
1447 while (buflen > 0) {
1448 for (f = fmt; *f != '%' && *f != 0; ++f)
1454 memcpy(buf, fmt, len);
1469 width = va_arg(args, int);
1472 while (isdigit(c)) {
1473 width = width * 10 + c - '0';
1480 prec = va_arg(args, int);
1483 while (isdigit(c)) {
1484 prec = prec * 10 + c - '0';
1495 i = va_arg(args, int);
1504 val = va_arg(args, unsigned int);
1508 val = va_arg(args, unsigned int);
1512 val = (unsigned long) va_arg(args, void *);
1517 str = va_arg(args, char *);
1520 num[0] = va_arg(args, int);
1525 str = strerror(errno);
1528 str = ip_ntoa(va_arg(args, u_int32_t));
1531 f = va_arg(args, char *);
1533 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
1535 /* On the powerpc, a va_list is an array of 1 structure */
1536 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
1544 str += 4; /* chop off the day name */
1545 str[15] = 0; /* chop off year and newline */
1547 case 'v': /* "visible" string */
1548 case 'q': /* quoted string */
1550 p = va_arg(args, unsigned char *);
1551 if (fillch == '0' && prec > 0) {
1554 n = strlen((char *)p);
1555 if (prec > 0 && prec < n)
1558 while (n > 0 && buflen > 0) {
1561 if (!quoted && c >= 0x80) {
1566 if (quoted && (c == '"' || c == '\\'))
1568 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1572 case '\t': OUTCHAR('t'); break;
1573 case '\n': OUTCHAR('n'); break;
1574 case '\b': OUTCHAR('b'); break;
1575 case '\f': OUTCHAR('f'); break;
1578 OUTCHAR(hexchars[c >> 4]);
1579 OUTCHAR(hexchars[c & 0xf]);
1596 --fmt; /* so %z outputs %z etc. */
1601 str = num + sizeof(num);
1603 while (str > num + neg) {
1604 *--str = hexchars[val % base];
1606 if (--prec <= 0 && val == 0)
1618 len = num + sizeof(num) - 1 - str;
1621 if (prec > 0 && len > prec)
1627 if ((n = width - len) > 0) {
1635 memcpy(buf, str, len);
1644 * script_setenv - set an environment variable value to be used
1645 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1648 script_setenv(var, value)
1651 int vl = strlen(var);
1653 char *p, *newstring;
1655 newstring = (char *) malloc(vl + strlen(value) + 2);
1658 strcpy(newstring, var);
1659 newstring[vl] = '=';
1660 strcpy(newstring+vl+1, value);
1662 /* check if this variable is already set */
1663 if (script_env != 0) {
1664 for (i = 0; (p = script_env[i]) != 0; ++i) {
1665 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1667 script_env[i] = newstring;
1673 script_env = (char **) malloc(16 * sizeof(char *));
1674 if (script_env == 0)
1679 /* reallocate script_env with more space if needed */
1680 if (i + 1 >= s_env_nalloc) {
1682 char **newenv = (char **) realloc((void *)script_env,
1683 new_n * sizeof(char *));
1686 script_env = newenv;
1687 s_env_nalloc = new_n;
1690 script_env[i] = newstring;
1691 script_env[i+1] = 0;
1695 * script_unsetenv - remove a variable from the environment
1699 script_unsetenv(var)
1702 int vl = strlen(var);
1706 if (script_env == 0)
1708 for (i = 0; (p = script_env[i]) != 0; ++i) {
1709 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1711 while ((script_env[i] = script_env[i+1]) != 0)