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 $
34 #include <sys/param.h>
35 #include <sys/types.h>
38 #include <sys/resource.h>
40 #include <sys/socket.h>
50 #include "pathnames.h"
51 #include "patchlevel.h"
58 extern char *strerror();
63 #endif /* IPX_CHANGE */
69 char ifname[32]; /* Interface name */
70 int ifunit; /* Interface unit number */
72 char *progname; /* Name of this program */
73 char hostname[MAXNAMELEN]; /* Our hostname */
74 static char pidfilename[MAXPATHLEN]; /* name of pid file */
75 static char iffilename[MAXPATHLEN]; /* name of if file */
76 static char default_devnam[MAXPATHLEN]; /* name of default device */
77 static pid_t pid; /* Our pid */
78 static uid_t uid; /* Our real user-id */
79 time_t etime,stime; /* End and Start time */
80 int minutes; /* connection duration */
81 static int conn_running; /* we have a [dis]connector running */
83 int ttyfd = -1; /* Serial port file descriptor */
84 mode_t tty_mode = -1; /* Original access permissions to tty */
85 int baud_rate; /* Actual bits/second for serial device */
86 int hungup; /* terminal has been hung up */
87 int privileged; /* we're running as real uid root */
88 int need_holdoff; /* need holdoff period before restarting */
89 int detached; /* have detached from terminal */
91 int phase; /* where the link is at */
95 char **script_env; /* Env. variable values for scripts */
96 int s_env_nalloc; /* # words avail at script_env */
98 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
99 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
101 static int n_children; /* # child processes still running */
103 static int locked; /* lock() has succeeded */
105 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
107 /* Prototypes for procedures local to this file. */
109 static void create_pidfile(void);
110 static void cleanup(void);
111 static void close_tty(void);
112 static void get_input(void);
113 static void calltimeout(void);
114 static struct timeval *timeleft(struct timeval *);
115 static void kill_my_pg(int);
116 static void hup(int);
117 static void term(int);
118 static void chld(int);
119 static void toggle_debug(int);
120 static void open_ccp(int);
121 static void bad_signal(int);
122 static void holdoff_end(void *);
123 static int device_script(char *, int, int);
124 static void reap_kids(void);
125 static void pr_log(void *, char *, ...);
127 extern char *ttyname(int);
128 extern char *getlogin(void);
132 #define O_NONBLOCK O_NDELAY
136 #define setlogmask(x)
140 * PPP Data Link Layer "protocol" table.
141 * One entry per supported protocol.
142 * The last entry must be NULL.
144 struct protent *protocols[] = {
163 main(int argc, char *argv[])
172 struct protent *protp;
174 int connect_attempts = 0;
177 phase = PHASE_INITIALIZE;
181 strcpy(default_devnam, devnam);
185 /* Initialize syslog facilities */
187 openlog("pppd", LOG_PID);
189 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
190 setlogmask(LOG_UPTO(LOG_INFO));
193 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
194 option_error("Couldn't get hostname: %m");
197 hostname[MAXNAMELEN-1] = 0;
200 privileged = uid == 0;
201 sprintf(numbuf, "%d", uid);
202 script_setenv("UID", numbuf);
205 * Initialize to the standard option set, then parse, in order,
206 * the system options file, the user's options file,
207 * the tty's options file, and the command line arguments.
209 for (i = 0; (protp = protocols[i]) != NULL; ++i)
214 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
215 || !options_from_user())
217 scan_args(argc-1, argv+1); /* look for tty name on command line */
218 if (!options_for_tty()
219 || !parse_args(argc-1, argv+1))
223 * Check that we are running as root.
225 if (geteuid() != 0) {
226 option_error("must be root to run %s, since it is not setuid-root",
231 if (!ppp_available()) {
232 option_error(no_ppp_msg);
237 * Check that the options given are valid and consistent.
240 auth_check_options();
241 for (i = 0; (protp = protocols[i]) != NULL; ++i)
242 if (protp->check_options != NULL)
243 (*protp->check_options)();
244 if (demand && connector == 0) {
245 option_error("connect script required for demand-dialling\n");
249 script_setenv("DEVICE", devnam);
250 sprintf(numbuf, "%d", baud_rate);
251 script_setenv("SPEED", numbuf);
254 * If the user has specified the default device name explicitly,
255 * pretend they hadn't.
257 if (!default_device && strcmp(devnam, default_devnam) == 0)
263 * Initialize system-dependent stuff and magic number package.
268 setlogmask(LOG_UPTO(LOG_DEBUG));
271 * Detach ourselves from the terminal, if required,
272 * and identify who is running us.
281 if (pw != NULL && pw->pw_name != NULL)
286 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
287 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
290 * Compute mask of all interesting signals and install signal handlers
291 * for each. Only one signal handler may be active at a time. Therefore,
292 * all other signals should be masked when any handler is executing.
295 sigaddset(&mask, SIGHUP);
296 sigaddset(&mask, SIGINT);
297 sigaddset(&mask, SIGTERM);
298 sigaddset(&mask, SIGCHLD);
300 #define SIGNAL(s, handler) { \
301 sa.sa_handler = handler; \
302 if (sigaction(s, &sa, NULL) < 0) { \
303 syslog(LOG_ERR, "Couldn't establish signal handler (%d): %m", s); \
310 SIGNAL(SIGHUP, hup); /* Hangup */
311 SIGNAL(SIGINT, term); /* Interrupt */
312 SIGNAL(SIGTERM, term); /* Terminate */
313 SIGNAL(SIGCHLD, chld);
315 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
316 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
319 * Install a handler for other signals which would otherwise
320 * cause pppd to exit without cleaning up.
322 SIGNAL(SIGABRT, bad_signal);
323 SIGNAL(SIGALRM, bad_signal);
324 SIGNAL(SIGFPE, bad_signal);
325 SIGNAL(SIGILL, bad_signal);
326 SIGNAL(SIGPIPE, bad_signal);
327 SIGNAL(SIGQUIT, bad_signal);
328 SIGNAL(SIGSEGV, bad_signal);
330 SIGNAL(SIGBUS, bad_signal);
333 SIGNAL(SIGEMT, bad_signal);
336 SIGNAL(SIGPOLL, bad_signal);
339 SIGNAL(SIGPROF, bad_signal);
342 SIGNAL(SIGSYS, bad_signal);
345 SIGNAL(SIGTRAP, bad_signal);
348 SIGNAL(SIGVTALRM, bad_signal);
351 SIGNAL(SIGXCPU, bad_signal);
354 SIGNAL(SIGXFSZ, bad_signal);
358 * Apparently we can get a SIGPIPE when we call syslog, if
359 * syslogd has died and been restarted. Ignoring it seems
362 signal(SIGPIPE, SIG_IGN);
365 * If we're doing dial-on-demand, set up the interface now.
369 * Open the loopback channel and set it up to be the ppp interface.
373 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
374 sprintf(ifname, "ppp%d", ifunit);
375 script_setenv("IFNAME", ifname);
377 create_pidfile(); /* write pid to file */
380 * Configure the interface and mark it up, etc.
391 * Don't do anything until we see some activity.
393 phase = PHASE_DORMANT;
397 wait_loop_output(timeleft(&timo));
404 if (get_loop_output())
410 * Now we want to bring up the link.
413 syslog(LOG_INFO, "Starting link");
417 * Lock the device if we've been asked to.
419 if (lockflag && !default_device) {
420 if (lock(devnam) < 0)
426 * Open the serial device and set it up to be the ppp interface.
427 * First we open it in non-blocking mode so we can set the
428 * various termios flags appropriately. If we aren't dialling
429 * out and we want to use the modem lines, we reopen it later
430 * in order to wait for the carrier detect signal from the modem.
432 while ((ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0)) < 0) {
434 syslog(LOG_ERR, "Failed to open %s: %m", devnam);
435 if (!persist || errno != EINTR)
438 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
439 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
441 "Couldn't reset non-blocking mode on device: %m");
447 * Do the equivalent of `mesg n' to stop broadcast messages.
449 if (fstat(ttyfd, &statbuf) < 0
450 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
452 "Couldn't restrict write permissions to %s: %m", devnam);
454 tty_mode = statbuf.st_mode;
456 /* run connection script */
457 if (connector && connector[0]) {
458 MAINDEBUG((LOG_INFO, "Connecting with <%s>", connector));
461 * Set line speed, flow control, etc.
462 * On most systems we set CLOCAL for now so that we can talk
463 * to the modem before carrier comes up. But this has the
464 * side effect that we might miss it if CD drops before we
465 * get to clear CLOCAL below. On systems where we can talk
466 * successfully to the modem with CLOCAL clear and CD down,
467 * we can clear CLOCAL at this point.
469 set_up_tty(ttyfd, 1);
471 /* drop dtr to hang up in case modem is off hook */
472 if (!default_device && modem) {
473 setdtr(ttyfd, FALSE);
478 if (device_script(connector, ttyfd, ttyfd) < 0) {
479 syslog(LOG_ERR, "Connect script failed");
480 setdtr(ttyfd, FALSE);
486 syslog(LOG_INFO, "Serial connection established.");
487 sleep(1); /* give it time to set up its terminal */
490 connect_attempts = 0; /* we made it through ok */
492 /* set line speed, flow control, etc.; clear CLOCAL if modem option */
493 set_up_tty(ttyfd, 0);
495 /* reopen tty if necessary to wait for carrier */
496 if (connector == NULL && modem) {
497 while ((i = open(devnam, O_RDWR)) < 0) {
499 syslog(LOG_ERR, "Failed to reopen %s: %m", devnam);
500 if (!persist || errno != EINTR ||
507 /* run welcome script, if any */
508 if (welcomer && welcomer[0]) {
509 if (device_script(welcomer, ttyfd, ttyfd) < 0)
510 syslog(LOG_WARNING, "Welcome script failed");
513 /* set up the serial device as a ppp interface */
514 establish_ppp(ttyfd);
518 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
519 sprintf(ifname, "ppp%d", ifunit);
521 create_pidfile(); /* write pid to file */
523 /* write interface unit number to file */
524 for (n = strlen(devnam); n > 0 ; n--)
525 if (devnam[n] == '/') {
529 sprintf(iffilename, "%s%s.if", _PATH_VARRUN, &devnam[n]);
530 if ((iffile = fopen(iffilename, "w")) != NULL) {
531 fprintf(iffile, "ppp%d\n", ifunit);
534 syslog(LOG_ERR, "Failed to create if file %s: %m", iffilename);
538 script_setenv("IFNAME", ifname);
542 * Start opening the connection and wait for
543 * incoming events (reply, timeout, etc.).
545 syslog(LOG_NOTICE, "Connect: %s <--> %s", ifname, devnam);
548 lcp_open(0); /* Start protocol */
549 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
550 wait_input(timeleft(&timo));
554 lcp_close(0, "User request");
558 if (phase == PHASE_NETWORK) {
559 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
560 (*ccp_protent.open)(0);
564 reap_kids(); /* Don't leave dead kids lying around */
568 * If we may want to bring the link up again, transfer
569 * the ppp unit back to the loopback. Set the
570 * real serial device back to its normal mode of operation.
575 disestablish_ppp(ttyfd);
578 * Run disconnector script, if requested.
579 * XXX we may not be able to do this if the line has hung up!
581 if (disconnector && !hungup) {
582 set_up_tty(ttyfd, 1);
583 if (device_script(disconnector, ttyfd, ttyfd) < 0) {
584 syslog(LOG_WARNING, "disconnect script failed");
586 syslog(LOG_INFO, "Serial link disconnected.");
599 if (pidfilename[0] != 0
600 && unlink(pidfilename) < 0 && errno != ENOENT)
601 syslog(LOG_WARNING, "unable to delete pid file: %m");
605 if (unlink(iffilename) < 0 && errno != ENOENT)
606 syslog(LOG_WARNING, "unable to delete if file: %m");
610 /* limit to retries? */
611 if (max_con_attempts)
612 if (connect_attempts >= max_con_attempts)
620 if (holdoff > 0 && need_holdoff) {
621 phase = PHASE_HOLDOFF;
622 TIMEOUT(holdoff_end, NULL, holdoff);
624 wait_time(timeleft(&timo));
630 phase = PHASE_DORMANT; /* allow signal to end holdoff */
633 } while (phase == PHASE_HOLDOFF);
642 * detach - detach us from the controlling terminal.
649 if (daemon(0, 0) < 0) {
650 perror("Couldn't detach from controlling terminal");
655 /* update pid file if it has been written already */
661 * Create a file containing our process ID.
668 sprintf(pidfilename, "%s%s.pid", _PATH_VARRUN, ifname);
669 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
670 fprintf(pidfile, "%d\n", pid);
673 syslog(LOG_ERR, "Failed to create pid file %s: %m", pidfilename);
679 * holdoff_end - called via a timeout when the holdoff period ends.
682 holdoff_end(void *arg)
684 phase = PHASE_DORMANT;
688 * get_input - called when incoming data is available.
696 struct protent *protp;
698 p = inpacket_buf; /* point to beginning of packet buffer */
700 len = read_packet(inpacket_buf);
706 minutes = (etime-stime)/60;
707 syslog(LOG_NOTICE, "Modem hangup, connected for %d minutes", (minutes >1) ? minutes : 1);
709 lcp_lowerdown(0); /* serial link is no longer available */
714 if (debug /*&& (debugflags & DBG_INPACKET)*/)
715 log_packet(p, len, "rcvd ", LOG_DEBUG);
717 if (len < PPP_HDRLEN) {
718 MAINDEBUG((LOG_INFO, "io(): Received short packet."));
722 p += 2; /* Skip address and control */
723 GETSHORT(protocol, p);
727 * Toss all non-LCP packets unless LCP is OPEN.
729 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
731 "get_input: Received non-LCP packet when LCP not open."));
736 * Until we get past the authentication phase, toss all packets
737 * except LCP, LQR and authentication packets.
739 if (phase <= PHASE_AUTHENTICATE
740 && !(protocol == PPP_LCP || protocol == PPP_LQR
741 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
742 MAINDEBUG((LOG_INFO, "get_input: discarding proto 0x%x in phase %d",
748 * Upcall the proper protocol input routine.
750 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
751 if (protp->protocol == protocol && protp->enabled_flag) {
752 (*protp->input)(0, p, len);
755 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
756 && protp->datainput != NULL) {
757 (*protp->datainput)(0, p, len);
763 syslog(LOG_WARNING, "Unsupported protocol (0x%x) received", protocol);
764 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
769 * quit - Clean up state and exit (with an error indication).
778 * die - like quit, except we can specify an exit status.
784 syslog(LOG_INFO, "Exit.");
789 * cleanup - restore anything which needs to be restored before we exit
800 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
801 syslog(LOG_WARNING, "unable to delete pid file: %m");
809 * close_tty - restore the terminal device and close it.
814 disestablish_ppp(ttyfd);
816 /* drop dtr to hang up */
818 setdtr(ttyfd, FALSE);
820 * This sleep is in case the serial port has CLOCAL set by default,
821 * and consequently will reassert DTR when we close the device.
828 if (tty_mode != (mode_t) -1)
829 fchmod(ttyfd, tty_mode);
837 struct timeval c_time; /* time at which to call routine */
838 void *c_arg; /* argument to routine */
839 void (*c_func)(void *); /* routine */
840 struct callout *c_next;
843 static struct callout *callout = NULL; /* Callout list */
844 static struct timeval timenow; /* Current time */
847 * timeout - Schedule a timeout.
849 * Note that this timeout takes the number of seconds, NOT hz (as in
853 timeout(void (*func)(void *), void *arg, int time)
855 struct callout *newp, *p, **pp;
857 MAINDEBUG((LOG_DEBUG, "Timeout %lx:%lx in %d seconds.",
858 (long) func, (long) arg, time));
863 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL) {
864 syslog(LOG_ERR, "Out of memory in timeout()!");
869 gettimeofday(&timenow, NULL);
870 newp->c_time.tv_sec = timenow.tv_sec + time;
871 newp->c_time.tv_usec = timenow.tv_usec;
874 * Find correct place and link it in.
876 for (pp = &callout; (p = *pp); pp = &p->c_next)
877 if (newp->c_time.tv_sec < p->c_time.tv_sec
878 || (newp->c_time.tv_sec == p->c_time.tv_sec
879 && newp->c_time.tv_usec < p->c_time.tv_sec))
887 * untimeout - Unschedule a timeout.
890 untimeout(void (*func)(void *), void *arg)
892 struct callout **copp, *freep;
894 MAINDEBUG((LOG_DEBUG, "Untimeout %lx:%lx.", (long) func, (long) arg));
897 * Find first matching timeout and remove it from the list.
899 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
900 if (freep->c_func == func && freep->c_arg == arg) {
901 *copp = freep->c_next;
902 free((char *) freep);
909 * calltimeout - Call any timeout routines which are now due.
916 while (callout != NULL) {
919 if (gettimeofday(&timenow, NULL) < 0) {
920 syslog(LOG_ERR, "Failed to get time of day: %m");
923 if (!(p->c_time.tv_sec < timenow.tv_sec
924 || (p->c_time.tv_sec == timenow.tv_sec
925 && p->c_time.tv_usec <= timenow.tv_usec)))
926 break; /* no, it's not time yet */
929 (*p->c_func)(p->c_arg);
937 * timeleft - return the length of time until the next timeout is due.
939 static struct timeval *
940 timeleft(struct timeval *tvp)
945 gettimeofday(&timenow, NULL);
946 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
947 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
948 if (tvp->tv_usec < 0) {
949 tvp->tv_usec += 1000000;
953 tvp->tv_sec = tvp->tv_usec = 0;
960 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
965 struct sigaction act, oldact;
967 act.sa_handler = SIG_IGN;
970 sigaction(sig, &act, &oldact);
971 sigaction(sig, &oldact, NULL);
976 * hup - Catch SIGHUP signal.
978 * Indicates that the physical layer has been disconnected.
979 * We don't rely on this indication; if the user has sent this
980 * signal, we just take the link down.
985 syslog(LOG_INFO, "Hangup (SIGHUP)");
988 /* Send the signal to the [dis]connector process(es) also */
994 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
996 * Indicates that we should initiate a graceful disconnect and exit.
1002 syslog(LOG_INFO, "Terminating on signal %d.", sig);
1003 persist = 0; /* don't try to restart */
1006 /* Send the signal to the [dis]connector process(es) also */
1012 * chld - Catch SIGCHLD signal.
1013 * Calls reap_kids to get status for any dead kids.
1023 * toggle_debug - Catch SIGUSR1 signal.
1025 * Toggle debug flag.
1029 toggle_debug(int sig)
1033 setlogmask(LOG_UPTO(LOG_DEBUG));
1035 setlogmask(LOG_UPTO(LOG_WARNING));
1041 * open_ccp - Catch SIGUSR2 signal.
1043 * Try to (re)negotiate compression.
1054 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1059 static int crashed = 0;
1064 syslog(LOG_ERR, "Fatal signal %d", sig);
1066 kill_my_pg(SIGTERM);
1072 * device_script - run a program to connect or disconnect the
1076 device_script(char *program, int in, int out)
1087 syslog(LOG_ERR, "Failed to create child process: %m");
1112 if (nodetach == 0) {
1114 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1115 if (errfd >= 0 && errfd != 2) {
1122 execl("/bin/sh", "sh", "-c", program, NULL);
1123 syslog(LOG_ERR, "could not exec /bin/sh: %m");
1128 while (waitpid(pid, &status, 0) < 0) {
1131 syslog(LOG_ERR, "error waiting for (dis)connection process: %m");
1136 return (status == 0 ? 0 : -1);
1141 * run-program - execute a program with given arguments,
1142 * but don't wait for it.
1143 * If the program can't be executed, logs an error unless
1144 * must_exist is 0 and the program file doesn't exist.
1147 run_program(char *prog, char **args, int must_exist)
1153 syslog(LOG_ERR, "Failed to create child process for %s: %m", prog);
1159 /* Leave the current location */
1160 setsid(); /* No controlling tty. */
1161 umask (S_IRWXG|S_IRWXO);
1162 chdir ("/"); /* no current directory. */
1166 /* Ensure that nothing of our device environment is inherited. */
1172 close (ttyfd); /* tty interface to the ppp device */
1174 /* Don't pass handles to the PPP device, even by accident. */
1175 new_fd = open (_PATH_DEVNULL, O_RDWR);
1178 dup2 (new_fd, 0); /* stdin <- /dev/null */
1181 dup2 (0, 1); /* stdout -> /dev/null */
1182 dup2 (0, 2); /* stderr -> /dev/null */
1186 /* Force the priority back to zero if pppd is running higher. */
1187 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1188 syslog (LOG_WARNING, "can't reset priority to 0: %m");
1191 /* SysV recommends a second fork at this point. */
1193 /* run the program; give it a null environment */
1194 execve(prog, args, script_env);
1195 if (must_exist || errno != ENOENT)
1196 syslog(LOG_WARNING, "Can't execute %s: %m", prog);
1199 MAINDEBUG((LOG_DEBUG, "Script %s started; pid = %d", prog, pid));
1206 * reap_kids - get status from any dead child processes,
1207 * and log a message for abnormal terminations.
1214 if (n_children == 0)
1216 if ((pid = waitpid(-1, &status, WNOHANG)) == -1) {
1217 if (errno != ECHILD)
1218 syslog(LOG_ERR, "Error waiting for child process: %m");
1223 if (WIFSIGNALED(status)) {
1224 syslog(LOG_WARNING, "Child process %d terminated with signal %d",
1225 pid, WTERMSIG(status));
1232 * log_packet - format a packet and log it.
1235 char line[256]; /* line to be logged accumulated here */
1239 log_packet(u_char *p, int len, char *prefix, int level)
1241 strcpy(line, prefix);
1242 linep = line + strlen(line);
1243 format_packet(p, len, pr_log, NULL);
1245 syslog(level, "%s", line);
1249 * format_packet - make a readable representation of a packet,
1250 * calling `printer(arg, format, ...)' to output it.
1253 format_packet(u_char *p, int len, void (*printer)(void *, char *, ...),
1259 struct protent *protp;
1261 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1265 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1266 if (proto == protp->protocol)
1268 if (protp != NULL) {
1269 printer(arg, "[%s", protp->name);
1270 n = (*protp->printpkt)(p, len, printer, arg);
1275 printer(arg, "[proto=0x%x]", proto);
1279 for (; len > 0; --len) {
1281 printer(arg, " %.2x", x);
1286 pr_log __V((void *arg, char *fmt, ...))
1293 va_start(pvar, fmt);
1298 arg = va_arg(pvar, void *);
1299 fmt = va_arg(pvar, char *);
1302 n = vfmtmsg(buf, sizeof(buf), fmt, pvar);
1305 if (linep + n + 1 > line + sizeof(line)) {
1306 syslog(LOG_DEBUG, "%s", line);
1314 * print_string - print a readable representation of a string using
1318 print_string(char *p, int len, void (*printer)(void *, char *, ...),
1324 for (; len > 0; --len) {
1326 if (' ' <= c && c <= '~') {
1327 if (c == '\\' || c == '"')
1329 printer(arg, "%c", c);
1333 printer(arg, "\\n");
1336 printer(arg, "\\r");
1339 printer(arg, "\\t");
1342 printer(arg, "\\%.3o", c);
1350 * novm - log an error message saying we ran out of memory, and die.
1355 syslog(LOG_ERR, "Virtual memory exhausted allocating %s\n", msg);
1360 * fmtmsg - format a message into a buffer. Like sprintf except we
1361 * also specify the length of the output buffer, and we handle
1362 * %r (recursive format), %m (error message) and %I (IP address) formats.
1363 * Doesn't do floating-point formats.
1364 * Returns the number of chars put into buf.
1367 fmtmsg __V((char *buf, int buflen, char *fmt, ...))
1373 va_start(args, fmt);
1379 buf = va_arg(args, char *);
1380 buflen = va_arg(args, int);
1381 fmt = va_arg(args, char *);
1383 n = vfmtmsg(buf, buflen, fmt, args);
1389 * vfmtmsg - like fmtmsg, takes a va_list instead of a list of args.
1391 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1394 vfmtmsg(char *buf, int buflen, char *fmt, va_list args)
1397 int width, prec, fillch;
1398 int base, len, neg, quoted;
1399 unsigned long val = 0;
1400 char *str, *f, *buf0;
1404 static char hexchars[] = "0123456789abcdef";
1408 while (buflen > 0) {
1409 for (f = fmt; *f != '%' && *f != 0; ++f)
1415 memcpy(buf, fmt, len);
1430 width = va_arg(args, int);
1433 while (isdigit(c)) {
1434 width = width * 10 + c - '0';
1441 prec = va_arg(args, int);
1444 while (isdigit(c)) {
1445 prec = prec * 10 + c - '0';
1456 i = va_arg(args, int);
1465 val = va_arg(args, unsigned int);
1469 val = va_arg(args, unsigned int);
1473 val = (unsigned long) va_arg(args, void *);
1478 str = va_arg(args, char *);
1481 num[0] = va_arg(args, int);
1486 str = strerror(errno);
1489 str = ip_ntoa(va_arg(args, u_int32_t));
1492 f = va_arg(args, char *);
1493 #if !defined(__powerpc__) && !defined(__x86_64__)
1494 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, va_list));
1496 /* On the powerpc, a va_list is an array of 1 structure */
1497 n = vfmtmsg(buf, buflen + 1, f, va_arg(args, void *));
1505 str += 4; /* chop off the day name */
1506 str[15] = 0; /* chop off year and newline */
1508 case 'v': /* "visible" string */
1509 case 'q': /* quoted string */
1511 p = va_arg(args, unsigned char *);
1512 if (fillch == '0' && prec > 0) {
1515 n = strlen((char *)p);
1516 if (prec > 0 && prec < n)
1519 while (n > 0 && buflen > 0) {
1522 if (!quoted && c >= 0x80) {
1527 if (quoted && (c == '"' || c == '\\'))
1529 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1533 case '\t': OUTCHAR('t'); break;
1534 case '\n': OUTCHAR('n'); break;
1535 case '\b': OUTCHAR('b'); break;
1536 case '\f': OUTCHAR('f'); break;
1539 OUTCHAR(hexchars[c >> 4]);
1540 OUTCHAR(hexchars[c & 0xf]);
1557 --fmt; /* so %z outputs %z etc. */
1562 str = num + sizeof(num);
1564 while (str > num + neg) {
1565 *--str = hexchars[val % base];
1567 if (--prec <= 0 && val == 0)
1579 len = num + sizeof(num) - 1 - str;
1582 if (prec > 0 && len > prec)
1588 if ((n = width - len) > 0) {
1596 memcpy(buf, str, len);
1605 * script_setenv - set an environment variable value to be used
1606 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1609 script_setenv(char *var, char *value)
1611 int vl = strlen(var);
1613 char *p, *newstring;
1615 newstring = (char *) malloc(vl + strlen(value) + 2);
1616 if (newstring == NULL)
1618 strcpy(newstring, var);
1619 newstring[vl] = '=';
1620 strcpy(newstring+vl+1, value);
1622 /* check if this variable is already set */
1623 if (script_env != NULL) {
1624 for (i = 0; (p = script_env[i]) != NULL; ++i) {
1625 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1627 script_env[i] = newstring;
1633 script_env = (char **) malloc(16 * sizeof(char *));
1634 if (script_env == NULL)
1639 /* reallocate script_env with more space if needed */
1640 if (i + 1 >= s_env_nalloc) {
1642 char **newenv = (char **) realloc((void *)script_env,
1643 new_n * sizeof(char *));
1646 script_env = newenv;
1647 s_env_nalloc = new_n;
1650 script_env[i] = newstring;
1651 script_env[i+1] = NULL;
1655 * script_unsetenv - remove a variable from the environment
1659 script_unsetenv(char *var)
1661 int vl = strlen(var);
1665 if (script_env == NULL)
1667 for (i = 0; (p = script_env[i]) != NULL; ++i) {
1668 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1670 while ((script_env[i] = script_env[i+1]) != NULL)