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[] = "$Id: main.c,v 1.67 1999/03/25 01:30:32 paulus Exp $";
37 #include <sys/param.h>
38 #include <sys/types.h>
41 #include <sys/resource.h>
43 #include <sys/socket.h>
44 #include <netinet/in.h>
54 #include "pathnames.h"
55 #include "patchlevel.h"
62 extern char *strerror();
67 #endif /* IPX_CHANGE */
73 char ifname[32]; /* Interface name */
74 int ifunit; /* Interface unit number */
76 char *progname; /* Name of this program */
77 char hostname[MAXNAMELEN]; /* Our hostname */
78 static char pidfilename[MAXPATHLEN]; /* name of pid file */
79 static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
80 static pid_t pid; /* Our pid */
81 static uid_t uid; /* Our real user-id */
82 static int conn_running; /* we have a [dis]connector running */
84 int ttyfd; /* 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 */
91 int log_to_fd; /* send log messages to this fd too */
93 static int fd_ppp = -1; /* fd for talking PPP */
94 static int fd_loop; /* fd for getting demand-dial packets */
95 static int pty_master; /* fd for master side of pty */
96 static int pty_slave; /* fd for slave side of pty */
97 static int real_ttyfd; /* fd for actual serial port (not pty) */
99 int phase; /* where the link is at */
104 static sigjmp_buf sigjmp;
106 char **script_env; /* Env. variable values for scripts */
107 int s_env_nalloc; /* # words avail at script_env */
109 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
110 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
112 static int n_children; /* # child processes still running */
114 static int locked; /* lock() has succeeded */
116 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
118 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
119 int ngroups; /* How many groups valid in groups */
121 static struct timeval start_time; /* Time when link was started. */
123 struct pppd_stats link_stats;
124 int link_stats_valid;
126 static int charshunt_pid; /* Process ID for charshunt */
128 /* Prototypes for procedures local to this file. */
130 static void create_pidfile __P((void));
131 static void cleanup __P((void));
132 static void close_tty __P((void));
133 static void get_input __P((void));
134 static void calltimeout __P((void));
135 static struct timeval *timeleft __P((struct timeval *));
136 static void kill_my_pg __P((int));
137 static void hup __P((int));
138 static void term __P((int));
139 static void chld __P((int));
140 static void toggle_debug __P((int));
141 static void open_ccp __P((int));
142 static void bad_signal __P((int));
143 static void holdoff_end __P((void *));
144 static int device_script __P((char *, int, int, int));
145 static void reap_kids __P((int waitfor));
146 static void pr_log __P((void *, char *, ...));
147 static void logit __P((int, char *, va_list));
148 static void vslp_printer __P((void *, char *, ...));
149 static void format_packet __P((u_char *, int, void (*) (void *, char *, ...),
151 static void record_child __P((int, char *, void (*) (void *), void *));
152 static int start_charshunt __P((int, int));
153 static void charshunt_done __P((void *));
154 static void charshunt __P((int, int, char *));
155 static int record_write(FILE *, int code, u_char *buf, int nb,
158 extern char *ttyname __P((int));
159 extern char *getlogin __P((void));
160 int main __P((int, char *[]));
164 #define O_NONBLOCK O_NDELAY
168 #define setlogmask(x)
172 * PPP Data Link Layer "protocol" table.
173 * One entry per supported protocol.
174 * The last entry must be NULL.
176 struct protent *protocols[] = {
205 struct protent *protp;
210 phase = PHASE_INITIALIZE;
215 /* Initialize syslog facilities */
217 openlog("pppd", LOG_PID);
219 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
220 setlogmask(LOG_UPTO(LOG_INFO));
223 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
224 option_error("Couldn't get hostname: %m");
227 hostname[MAXNAMELEN-1] = 0;
230 privileged = uid == 0;
231 slprintf(numbuf, sizeof(numbuf), "%d", uid);
232 script_setenv("ORIG_UID", numbuf);
234 ngroups = getgroups(NGROUPS_MAX, groups);
237 * Initialize to the standard option set, then parse, in order,
238 * the system options file, the user's options file,
239 * the tty's options file, and the command line arguments.
241 for (i = 0; (protp = protocols[i]) != NULL; ++i)
246 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
247 || !options_from_user())
249 using_pty = notty || ptycommand != NULL;
250 scan_args(argc-1, argv+1); /* look for tty name on command line */
253 * Work out the device name, if it hasn't already been specified.
256 p = isatty(0)? ttyname(0): NULL;
259 strlcpy(devnam, p, sizeof(devnam));
260 else if (strcmp(devnam, p) == 0)
266 * Parse the tty options file and the command line.
268 if (!options_for_tty()
269 || !parse_args(argc-1, argv+1))
273 * Check that we are running as root.
275 if (geteuid() != 0) {
276 option_error("must be root to run %s, since it is not setuid-root",
281 if (!ppp_available()) {
282 option_error(no_ppp_msg);
287 * Check that the options given are valid and consistent.
289 if (!sys_check_options())
291 auth_check_options();
292 for (i = 0; (protp = protocols[i]) != NULL; ++i)
293 if (protp->check_options != NULL)
294 (*protp->check_options)();
295 if (demand && connector == 0) {
296 option_error("connect script is required for demand-dialling\n");
301 if (!default_device) {
302 option_error("%s option precludes specifying device name",
303 notty? "notty": "pty");
306 if (ptycommand != NULL && notty) {
307 option_error("pty option is incompatible with notty option");
310 default_device = notty;
314 if (devnam[0] == 0) {
315 option_error("no device specified and stdin is not a tty");
322 log_to_fd = 1; /* default to stdout */
324 script_setenv("DEVICE", devnam);
325 slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
326 script_setenv("SPEED", numbuf);
329 * Initialize system-dependent stuff and magic number package.
334 setlogmask(LOG_UPTO(LOG_DEBUG));
337 * Detach ourselves from the terminal, if required,
338 * and identify who is running us.
340 if (!nodetach && !updetach)
346 if (pw != NULL && pw->pw_name != NULL)
351 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
352 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
355 * Compute mask of all interesting signals and install signal handlers
356 * for each. Only one signal handler may be active at a time. Therefore,
357 * all other signals should be masked when any handler is executing.
360 sigaddset(&mask, SIGHUP);
361 sigaddset(&mask, SIGINT);
362 sigaddset(&mask, SIGTERM);
363 sigaddset(&mask, SIGCHLD);
364 sigaddset(&mask, SIGUSR2);
366 #define SIGNAL(s, handler) do { \
367 sa.sa_handler = handler; \
368 if (sigaction(s, &sa, NULL) < 0) \
369 fatal("Couldn't establish signal handler (%d): %m", s); \
374 SIGNAL(SIGHUP, hup); /* Hangup */
375 SIGNAL(SIGINT, term); /* Interrupt */
376 SIGNAL(SIGTERM, term); /* Terminate */
377 SIGNAL(SIGCHLD, chld);
379 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
380 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
383 * Install a handler for other signals which would otherwise
384 * cause pppd to exit without cleaning up.
386 SIGNAL(SIGABRT, bad_signal);
387 SIGNAL(SIGALRM, bad_signal);
388 SIGNAL(SIGFPE, bad_signal);
389 SIGNAL(SIGILL, bad_signal);
390 SIGNAL(SIGPIPE, bad_signal);
391 SIGNAL(SIGQUIT, bad_signal);
392 SIGNAL(SIGSEGV, bad_signal);
394 SIGNAL(SIGBUS, bad_signal);
397 SIGNAL(SIGEMT, bad_signal);
400 SIGNAL(SIGPOLL, bad_signal);
403 SIGNAL(SIGPROF, bad_signal);
406 SIGNAL(SIGSYS, bad_signal);
409 SIGNAL(SIGTRAP, bad_signal);
412 SIGNAL(SIGVTALRM, bad_signal);
415 SIGNAL(SIGXCPU, bad_signal);
418 SIGNAL(SIGXFSZ, bad_signal);
422 * Apparently we can get a SIGPIPE when we call syslog, if
423 * syslogd has died and been restarted. Ignoring it seems
426 signal(SIGPIPE, SIG_IGN);
431 * If we're doing dial-on-demand, set up the interface now.
435 * Open the loopback channel and set it up to be the ppp interface.
437 fd_loop = open_ppp_loopback();
439 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
440 slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
441 script_setenv("IFNAME", ifname);
443 create_pidfile(); /* write pid to file */
446 * Configure the interface and mark it up, etc.
459 * Don't do anything until we see some activity.
462 phase = PHASE_DORMANT;
466 if (sigsetjmp(sigjmp, 1) == 0) {
467 sigprocmask(SIG_BLOCK, &mask, NULL);
469 sigprocmask(SIG_UNBLOCK, &mask, NULL);
472 sigprocmask(SIG_UNBLOCK, &mask, NULL);
473 wait_input(timeleft(&timo));
483 if (get_loop_output())
488 if (kill_link && !persist)
492 * Now we want to bring up the link.
495 info("Starting link");
499 * Get a pty master/slave pair if the pty, notty, or record
500 * options were specified.
502 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
505 if (ptycommand != NULL || notty || record_file != NULL) {
506 if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) {
507 error("Couldn't allocate pseudo-tty");
510 set_up_tty(pty_slave, 1);
514 * Lock the device if we've been asked to.
516 if (lockflag && !default_device) {
517 if (lock(devnam) < 0)
523 * Open the serial device and set it up to be the ppp interface.
524 * First we open it in non-blocking mode so we can set the
525 * various termios flags appropriately. If we aren't dialling
526 * out and we want to use the modem lines, we reopen it later
527 * in order to wait for the carrier detect signal from the modem.
531 if (devnam[0] != 0) {
533 /* If the user specified the device name, become the
534 user before opening it. */
535 if (!devnam_info.priv && !default_device)
537 ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
538 if (!devnam_info.priv && !default_device)
543 error("Failed to open %s: %m", devnam);
544 if (!persist || errno != EINTR)
547 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
548 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
549 warn("Couldn't reset non-blocking mode on device: %m");
552 * Do the equivalent of `mesg n' to stop broadcast messages.
554 if (fstat(ttyfd, &statbuf) < 0
555 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
556 warn("Couldn't restrict write permissions to %s: %m", devnam);
558 tty_mode = statbuf.st_mode;
561 * Set line speed, flow control, etc.
562 * If we have a non-null connection script,
563 * on most systems we set CLOCAL for now so that we can talk
564 * to the modem before carrier comes up. But this has the
565 * side effect that we might miss it if CD drops before we
566 * get to clear CLOCAL below. On systems where we can talk
567 * successfully to the modem with CLOCAL clear and CD down,
568 * we could clear CLOCAL at this point.
570 set_up_tty(ttyfd, (connector != NULL && connector[0] != 0));
575 * If the notty and/or record option was specified,
576 * start up the character shunt now.
578 if (ptycommand != NULL) {
579 if (record_file != NULL) {
580 int ipipe[2], opipe[2], ok;
582 if (pipe(ipipe) < 0 || pipe(opipe) < 0)
583 fatal("Couldn't create pipes for record option: %m");
584 ok = device_script(ptycommand, opipe[0], ipipe[1], 1) == 0
585 && start_charshunt(ipipe[0], opipe[1]);
593 if (device_script(ptycommand, pty_master, pty_master, 1) < 0)
600 if (!start_charshunt(0, 1))
602 } else if (record_file != NULL) {
603 if (!start_charshunt(ttyfd, ttyfd))
607 /* run connection script */
608 if (connector && connector[0]) {
609 MAINDEBUG(("Connecting with <%s>", connector));
611 if (real_ttyfd != -1) {
612 if (!default_device && modem) {
613 setdtr(real_ttyfd, 0); /* in case modem is off hook */
615 setdtr(real_ttyfd, 1);
619 if (device_script(connector, ttyfd, ttyfd, 0) < 0) {
620 error("Connect script failed");
624 info("Serial connection established.");
626 /* set line speed, flow control, etc.;
627 clear CLOCAL if modem option */
628 if (real_ttyfd != -1)
629 set_up_tty(real_ttyfd, 0);
632 /* reopen tty if necessary to wait for carrier */
633 if (connector == NULL && modem && devnam[0] != 0) {
635 if ((i = open(devnam, O_RDWR)) >= 0)
638 error("Failed to reopen %s: %m", devnam);
639 if (!persist || errno != EINTR || hungup || kill_link)
645 /* run welcome script, if any */
646 if (welcomer && welcomer[0]) {
647 if (device_script(welcomer, ttyfd, ttyfd, 0) < 0)
648 warn("Welcome script failed");
651 /* set up the serial device as a ppp interface */
652 fd_ppp = establish_ppp(ttyfd);
658 info("Using interface ppp%d", ifunit);
659 slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
660 script_setenv("IFNAME", ifname);
662 create_pidfile(); /* write pid to file */
666 * Start opening the connection and wait for
667 * incoming events (reply, timeout, etc.).
669 notice("Connect: %s <--> %s", ifname, ppp_devnam);
670 gettimeofday(&start_time, NULL);
674 * If we are initiating this connection, wait for a short
675 * time for something from the peer. This can avoid bouncing
676 * our packets off his tty before he has it set up.
678 if (connector != NULL || ptycommand != NULL) {
685 lcp_open(0); /* Start protocol */
688 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
689 if (sigsetjmp(sigjmp, 1) == 0) {
690 sigprocmask(SIG_BLOCK, &mask, NULL);
691 if (kill_link || open_ccp_flag) {
692 sigprocmask(SIG_UNBLOCK, &mask, NULL);
695 sigprocmask(SIG_UNBLOCK, &mask, NULL);
696 wait_input(timeleft(&timo));
703 lcp_close(0, "User request");
707 if (phase == PHASE_NETWORK) {
708 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
709 (*ccp_protent.open)(0);
713 reap_kids(0); /* Don't leave dead kids lying around */
717 * Print connect time and statistics.
719 if (gettimeofday(&now, NULL) >= 0) {
720 int t = now.tv_sec - start_time.tv_sec;
721 t = (t + 5) / 6; /* now in 1/10ths of minutes */
722 info("Connect time %d.%d minutes.", t/10, t%10);
724 if (link_stats_valid) {
725 info("Sent %d bytes, received %d bytes.",
726 link_stats.bytes_out, link_stats.bytes_in);
730 * If we may want to bring the link up again, transfer
731 * the ppp unit back to the loopback. Set the
732 * real serial device back to its normal mode of operation.
738 disestablish_ppp(ttyfd);
742 * Run disconnector script, if requested.
743 * XXX we may not be able to do this if the line has hung up!
745 if (disconnector && !hungup) {
747 set_up_tty(real_ttyfd, 1);
748 if (device_script(disconnector, ttyfd, ttyfd, 0) < 0) {
749 warn("disconnect script failed");
751 info("Serial link disconnected.");
770 if (pidfilename[0] != 0
771 && unlink(pidfilename) < 0 && errno != ENOENT)
772 warn("unable to delete pid file: %m");
782 if (holdoff > 0 && need_holdoff) {
783 phase = PHASE_HOLDOFF;
784 TIMEOUT(holdoff_end, NULL, holdoff);
786 if (sigsetjmp(sigjmp, 1) == 0) {
787 sigprocmask(SIG_BLOCK, &mask, NULL);
789 sigprocmask(SIG_UNBLOCK, &mask, NULL);
792 sigprocmask(SIG_UNBLOCK, &mask, NULL);
793 wait_input(timeleft(&timo));
800 phase = PHASE_DORMANT; /* allow signal to end holdoff */
803 } while (phase == PHASE_HOLDOFF);
809 /* Wait for scripts to finish */
810 while (n_children > 0)
818 * detach - detach us from the controlling terminal.
825 if (daemon(0, 0) < 0) {
826 perror("Couldn't detach from controlling terminal");
832 /* update pid file if it has been written already */
838 * Create a file containing our process ID.
846 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
847 _PATH_VARRUN, ifname);
848 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
849 fprintf(pidfile, "%d\n", pid);
850 (void) fclose(pidfile);
852 error("Failed to create pid file %s: %m", pidfilename);
855 slprintf(numbuf, sizeof(numbuf), "%d", pid);
856 script_setenv("PPPD_PID", numbuf);
860 * holdoff_end - called via a timeout when the holdoff period ends.
866 phase = PHASE_DORMANT;
870 * get_input - called when incoming data is available.
878 struct protent *protp;
880 p = inpacket_buf; /* point to beginning of packet buffer */
882 len = read_packet(inpacket_buf);
887 notice("Modem hangup");
889 lcp_lowerdown(0); /* serial link is no longer available */
894 if (debug /*&& (debugflags & DBG_INPACKET)*/)
895 dbglog("rcvd %P", p, len);
897 if (len < PPP_HDRLEN) {
898 MAINDEBUG(("io(): Received short packet."));
902 p += 2; /* Skip address and control */
903 GETSHORT(protocol, p);
907 * Toss all non-LCP packets unless LCP is OPEN.
909 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
910 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
915 * Until we get past the authentication phase, toss all packets
916 * except LCP, LQR and authentication packets.
918 if (phase <= PHASE_AUTHENTICATE
919 && !(protocol == PPP_LCP || protocol == PPP_LQR
920 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
921 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
927 * Upcall the proper protocol input routine.
929 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
930 if (protp->protocol == protocol && protp->enabled_flag) {
931 (*protp->input)(0, p, len);
934 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
935 && protp->datainput != NULL) {
936 (*protp->datainput)(0, p, len);
942 warn("Unsupported protocol (0x%x) received", protocol);
943 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
948 * die - clean up state and exit with the specified status.
955 syslog(LOG_INFO, "Exit.");
960 * cleanup - restore anything which needs to be restored before we exit
969 disestablish_ppp(ttyfd);
973 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
974 warn("unable to delete pid file: %m");
982 * close_tty - restore the terminal device and close it.
987 /* drop dtr to hang up */
988 if (!default_device && modem) {
989 setdtr(real_ttyfd, 0);
991 * This sleep is in case the serial port has CLOCAL set by default,
992 * and consequently will reassert DTR when we close the device.
997 restore_tty(real_ttyfd);
999 if (tty_mode != (mode_t) -1) {
1000 if (fchmod(real_ttyfd, tty_mode) != 0) {
1001 /* XXX if devnam is a symlink, this will change the link */
1002 chmod(devnam, tty_mode);
1012 struct timeval c_time; /* time at which to call routine */
1013 void *c_arg; /* argument to routine */
1014 void (*c_func) __P((void *)); /* routine */
1015 struct callout *c_next;
1018 static struct callout *callout = NULL; /* Callout list */
1019 static struct timeval timenow; /* Current time */
1022 * timeout - Schedule a timeout.
1024 * Note that this timeout takes the number of seconds, NOT hz (as in
1028 timeout(func, arg, time)
1029 void (*func) __P((void *));
1033 struct callout *newp, *p, **pp;
1035 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1040 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1041 fatal("Out of memory in timeout()!");
1043 newp->c_func = func;
1044 gettimeofday(&timenow, NULL);
1045 newp->c_time.tv_sec = timenow.tv_sec + time;
1046 newp->c_time.tv_usec = timenow.tv_usec;
1049 * Find correct place and link it in.
1051 for (pp = &callout; (p = *pp); pp = &p->c_next)
1052 if (newp->c_time.tv_sec < p->c_time.tv_sec
1053 || (newp->c_time.tv_sec == p->c_time.tv_sec
1054 && newp->c_time.tv_usec < p->c_time.tv_usec))
1062 * untimeout - Unschedule a timeout.
1065 untimeout(func, arg)
1066 void (*func) __P((void *));
1069 struct callout **copp, *freep;
1071 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1074 * Find first matching timeout and remove it from the list.
1076 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1077 if (freep->c_func == func && freep->c_arg == arg) {
1078 *copp = freep->c_next;
1079 (void) free((char *) freep);
1086 * calltimeout - Call any timeout routines which are now due.
1093 while (callout != NULL) {
1096 if (gettimeofday(&timenow, NULL) < 0)
1097 fatal("Failed to get time of day: %m");
1098 if (!(p->c_time.tv_sec < timenow.tv_sec
1099 || (p->c_time.tv_sec == timenow.tv_sec
1100 && p->c_time.tv_usec <= timenow.tv_usec)))
1101 break; /* no, it's not time yet */
1103 callout = p->c_next;
1104 (*p->c_func)(p->c_arg);
1112 * timeleft - return the length of time until the next timeout is due.
1114 static struct timeval *
1116 struct timeval *tvp;
1118 if (callout == NULL)
1121 gettimeofday(&timenow, NULL);
1122 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1123 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1124 if (tvp->tv_usec < 0) {
1125 tvp->tv_usec += 1000000;
1128 if (tvp->tv_sec < 0)
1129 tvp->tv_sec = tvp->tv_usec = 0;
1136 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1142 struct sigaction act, oldact;
1144 act.sa_handler = SIG_IGN;
1147 sigaction(sig, &act, &oldact);
1148 sigaction(sig, &oldact, NULL);
1153 * hup - Catch SIGHUP signal.
1155 * Indicates that the physical layer has been disconnected.
1156 * We don't rely on this indication; if the user has sent this
1157 * signal, we just take the link down.
1163 info("Hangup (SIGHUP)");
1166 /* Send the signal to the [dis]connector process(es) also */
1169 kill(charshunt_pid, sig);
1171 siglongjmp(sigjmp, 1);
1176 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1178 * Indicates that we should initiate a graceful disconnect and exit.
1185 info("Terminating on signal %d.", sig);
1186 persist = 0; /* don't try to restart */
1189 /* Send the signal to the [dis]connector process(es) also */
1192 kill(charshunt_pid, sig);
1194 siglongjmp(sigjmp, 1);
1199 * chld - Catch SIGCHLD signal.
1200 * Calls reap_kids to get status for any dead kids.
1207 siglongjmp(sigjmp, 1);
1212 * toggle_debug - Catch SIGUSR1 signal.
1214 * Toggle debug flag.
1223 setlogmask(LOG_UPTO(LOG_DEBUG));
1225 setlogmask(LOG_UPTO(LOG_WARNING));
1231 * open_ccp - Catch SIGUSR2 signal.
1233 * Try to (re)negotiate compression.
1242 siglongjmp(sigjmp, 1);
1247 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1253 static int crashed = 0;
1258 error("Fatal signal %d", sig);
1260 kill_my_pg(SIGTERM);
1262 kill(charshunt_pid, SIGTERM);
1268 * device_script - run a program to talk to the serial device
1269 * (e.g. to run the connector or disconnector script).
1272 device_script(program, in, out, dont_wait)
1286 error("Failed to create child process: %m");
1295 int newin = dup(in);
1299 } else if (out == 2) {
1302 if (log_to_fd >= 0) {
1307 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1308 if (errfd >= 0 && errfd != 2) {
1331 if (getuid() != uid) {
1332 error("setuid failed");
1336 execl("/bin/sh", "sh", "-c", program, (char *)0);
1337 error("could not exec /bin/sh: %m");
1343 record_child(pid, program, NULL, NULL);
1345 while (waitpid(pid, &status, 0) < 0) {
1348 fatal("error waiting for (dis)connection process: %m");
1353 return (status == 0 ? 0 : -1);
1358 * We maintain a list of child process pids and
1359 * functions to call when they exit.
1364 void (*done) __P((void *));
1366 struct subprocess *next;
1369 struct subprocess *children;
1372 * run-program - execute a program with given arguments,
1373 * but don't wait for it.
1374 * If the program can't be executed, logs an error unless
1375 * must_exist is 0 and the program file doesn't exist.
1376 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1377 * or isn't an executable plain file, or the process ID of the child.
1378 * If done != NULL, (*done)(arg) will be called later (within
1379 * reap_kids) iff the return value is > 0.
1382 run_program(prog, args, must_exist, done, arg)
1386 void (*done) __P((void *));
1393 * First check if the file exists and is executable.
1394 * We don't use access() because that would use the
1395 * real user-id, which might not be root, and the script
1396 * might be accessible only to root.
1399 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1400 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1401 if (must_exist || errno != ENOENT)
1402 warn("Can't execute %s: %m", prog);
1408 error("Failed to create child process for %s: %m", prog);
1414 /* Leave the current location */
1415 (void) setsid(); /* No controlling tty. */
1416 (void) umask (S_IRWXG|S_IRWXO);
1417 (void) chdir ("/"); /* no current directory. */
1418 setuid(0); /* set real UID = root */
1421 /* Ensure that nothing of our device environment is inherited. */
1427 close (ttyfd); /* tty interface to the ppp device */
1428 if (real_ttyfd >= 0)
1431 /* Don't pass handles to the PPP device, even by accident. */
1432 new_fd = open (_PATH_DEVNULL, O_RDWR);
1435 dup2 (new_fd, 0); /* stdin <- /dev/null */
1438 dup2 (0, 1); /* stdout -> /dev/null */
1439 dup2 (0, 2); /* stderr -> /dev/null */
1443 /* Force the priority back to zero if pppd is running higher. */
1444 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1445 warn("can't reset priority to 0: %m");
1448 /* SysV recommends a second fork at this point. */
1450 /* run the program */
1451 execve(prog, args, script_env);
1452 if (must_exist || errno != ENOENT) {
1453 /* have to reopen the log, there's nowhere else
1454 for the message to go. */
1456 openlog("pppd", LOG_PID);
1458 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
1459 setlogmask(LOG_UPTO(LOG_INFO));
1461 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1468 dbglog("Script %s started; pid = %d", prog, pid);
1469 record_child(pid, prog, done, arg);
1476 * record_child - add a child process to the list for reap_kids
1480 record_child(pid, prog, done, arg)
1483 void (*done) __P((void *));
1486 struct subprocess *chp;
1490 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1492 warn("losing track of %s process", prog);
1498 chp->next = children;
1505 * reap_kids - get status from any dead child processes,
1506 * and log a message for abnormal terminations.
1513 struct subprocess *chp, **prevp;
1515 if (n_children == 0)
1517 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1520 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next)
1521 if (chp->pid == pid)
1523 if (WIFSIGNALED(status)) {
1524 warn("Child process %s (pid %d) terminated with signal %d",
1525 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1527 dbglog("process %d (%s) finished, status = 0x%x",
1528 pid, (chp? chp->prog: "??"), status);
1529 if (chp && chp->done)
1530 (*chp->done)(chp->arg);
1532 if (pid == -1 && errno != ECHILD && errno != EINTR)
1533 error("Error waiting for child process: %m");
1538 * log_packet - format a packet and log it.
1541 char line[256]; /* line to be logged accumulated here */
1545 log_packet(p, len, prefix, level)
1551 strlcpy(line, prefix, sizeof(line));
1552 linep = line + strlen(line);
1553 format_packet(p, len, pr_log, NULL);
1555 syslog(level, "%s", line);
1559 * format_packet - make a readable representation of a packet,
1560 * calling `printer(arg, format, ...)' to output it.
1563 format_packet(p, len, printer, arg)
1566 void (*printer) __P((void *, char *, ...));
1571 struct protent *protp;
1573 if (len >= PPP_HDRLEN && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
1577 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1578 if (proto == protp->protocol)
1580 if (protp != NULL) {
1581 printer(arg, "[%s", protp->name);
1582 n = (*protp->printpkt)(p, len, printer, arg);
1587 for (i = 0; (protp = protocols[i]) != NULL; ++i)
1588 if (proto == (protp->protocol & ~0x8000))
1590 if (protp != 0 && protp->data_name != 0) {
1591 printer(arg, "[%s data]", protp->data_name);
1593 printer(arg, "%.8B ...", p);
1595 printer(arg, "%.*B", len, p);
1598 printer(arg, "[proto=0x%x]", proto);
1603 printer(arg, "%.32B ...", p);
1605 printer(arg, "%.*B", len, p);
1609 pr_log __V((void *arg, char *fmt, ...))
1616 va_start(pvar, fmt);
1621 arg = va_arg(pvar, void *);
1622 fmt = va_arg(pvar, char *);
1625 n = vslprintf(buf, sizeof(buf), fmt, pvar);
1628 if (linep + n + 1 > line + sizeof(line)) {
1629 syslog(LOG_DEBUG, "%s", line);
1632 strlcpy(linep, buf, line + sizeof(line) - linep);
1637 * vslp_printer - used in processing a %P format
1639 struct buffer_info {
1645 vslp_printer __V((void *arg, char *fmt, ...))
1649 struct buffer_info *bi;
1652 va_start(pvar, fmt);
1657 arg = va_arg(pvar, void *);
1658 fmt = va_arg(pvar, char *);
1661 bi = (struct buffer_info *) arg;
1662 n = vslprintf(bi->ptr, bi->len, fmt, pvar);
1670 * print_string - print a readable representation of a string using
1674 print_string(p, len, printer, arg)
1677 void (*printer) __P((void *, char *, ...));
1683 for (; len > 0; --len) {
1685 if (' ' <= c && c <= '~') {
1686 if (c == '\\' || c == '"')
1688 printer(arg, "%c", c);
1692 printer(arg, "\\n");
1695 printer(arg, "\\r");
1698 printer(arg, "\\t");
1701 printer(arg, "\\%.3o", c);
1709 * novm - log an error message saying we ran out of memory, and die.
1715 fatal("Virtual memory exhausted allocating %s\n", msg);
1719 * slprintf - format a message into a buffer. Like sprintf except we
1720 * also specify the length of the output buffer, and we handle
1721 * %r (recursive format), %m (error message), %v (visible string),
1722 * %q (quoted string), %t (current time) and %I (IP address) formats.
1723 * Doesn't do floating-point formats.
1724 * Returns the number of chars put into buf.
1727 slprintf __V((char *buf, int buflen, char *fmt, ...))
1733 va_start(args, fmt);
1739 buf = va_arg(args, char *);
1740 buflen = va_arg(args, int);
1741 fmt = va_arg(args, char *);
1743 n = vslprintf(buf, buflen, fmt, args);
1749 * vslprintf - like slprintf, takes a va_list instead of a list of args.
1751 #define OUTCHAR(c) (buflen > 0? (--buflen, *buf++ = (c)): 0)
1754 vslprintf(buf, buflen, fmt, args)
1761 int width, prec, fillch;
1762 int base, len, neg, quoted;
1763 unsigned long val = 0;
1764 char *str, *f, *buf0;
1769 static char hexchars[] = "0123456789abcdef";
1770 struct buffer_info bufinfo;
1774 while (buflen > 0) {
1775 for (f = fmt; *f != '%' && *f != 0; ++f)
1781 memcpy(buf, fmt, len);
1796 width = va_arg(args, int);
1799 while (isdigit(c)) {
1800 width = width * 10 + c - '0';
1807 prec = va_arg(args, int);
1810 while (isdigit(c)) {
1811 prec = prec * 10 + c - '0';
1822 i = va_arg(args, int);
1831 val = va_arg(args, unsigned int);
1836 val = va_arg(args, unsigned int);
1840 val = (unsigned long) va_arg(args, void *);
1845 str = va_arg(args, char *);
1848 num[0] = va_arg(args, int);
1853 str = strerror(errno);
1856 ip = va_arg(args, u_int32_t);
1858 slprintf(num, sizeof(num), "%d.%d.%d.%d", (ip >> 24) & 0xff,
1859 (ip >> 16) & 0xff, (ip >> 8) & 0xff, ip & 0xff);
1863 f = va_arg(args, char *);
1865 n = vslprintf(buf, buflen + 1, f, va_arg(args, va_list));
1867 /* On the powerpc, a va_list is an array of 1 structure */
1868 n = vslprintf(buf, buflen + 1, f, va_arg(args, void *));
1876 str += 4; /* chop off the day name */
1877 str[15] = 0; /* chop off year and newline */
1879 case 'v': /* "visible" string */
1880 case 'q': /* quoted string */
1882 p = va_arg(args, unsigned char *);
1883 if (fillch == '0' && prec > 0) {
1886 n = strlen((char *)p);
1887 if (prec > 0 && prec < n)
1890 while (n > 0 && buflen > 0) {
1893 if (!quoted && c >= 0x80) {
1898 if (quoted && (c == '"' || c == '\\'))
1900 if (c < 0x20 || (0x7f <= c && c < 0xa0)) {
1904 case '\t': OUTCHAR('t'); break;
1905 case '\n': OUTCHAR('n'); break;
1906 case '\b': OUTCHAR('b'); break;
1907 case '\f': OUTCHAR('f'); break;
1910 OUTCHAR(hexchars[c >> 4]);
1911 OUTCHAR(hexchars[c & 0xf]);
1925 case 'P': /* print PPP packet */
1927 bufinfo.len = buflen + 1;
1928 p = va_arg(args, unsigned char *);
1929 n = va_arg(args, int);
1930 format_packet(p, n, vslp_printer, &bufinfo);
1932 buflen = bufinfo.len - 1;
1935 p = va_arg(args, unsigned char *);
1936 for (n = prec; n > 0; --n) {
1940 OUTCHAR(hexchars[(c >> 4) & 0xf]);
1941 OUTCHAR(hexchars[c & 0xf]);
1947 --fmt; /* so %z outputs %z etc. */
1952 str = num + sizeof(num);
1954 while (str > num + neg) {
1955 *--str = hexchars[val % base];
1957 if (--prec <= 0 && val == 0)
1969 len = num + sizeof(num) - 1 - str;
1972 if (prec > 0 && len > prec)
1978 if ((n = width - len) > 0) {
1986 memcpy(buf, str, len);
1995 * script_setenv - set an environment variable value to be used
1996 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1999 script_setenv(var, value)
2002 size_t vl = strlen(var) + strlen(value) + 2;
2004 char *p, *newstring;
2006 newstring = (char *) malloc(vl);
2009 slprintf(newstring, vl, "%s=%s", var, value);
2011 /* check if this variable is already set */
2012 if (script_env != 0) {
2013 for (i = 0; (p = script_env[i]) != 0; ++i) {
2014 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2016 script_env[i] = newstring;
2022 script_env = (char **) malloc(16 * sizeof(char *));
2023 if (script_env == 0)
2028 /* reallocate script_env with more space if needed */
2029 if (i + 1 >= s_env_nalloc) {
2031 char **newenv = (char **) realloc((void *)script_env,
2032 new_n * sizeof(char *));
2035 script_env = newenv;
2036 s_env_nalloc = new_n;
2039 script_env[i] = newstring;
2040 script_env[i+1] = 0;
2044 * script_unsetenv - remove a variable from the environment
2048 script_unsetenv(var)
2051 int vl = strlen(var);
2055 if (script_env == 0)
2057 for (i = 0; (p = script_env[i]) != 0; ++i) {
2058 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2060 while ((script_env[i] = script_env[i+1]) != 0)
2068 * strlcpy - like strcpy/strncpy, doesn't overflow destination buffer,
2069 * always leaves destination null-terminated (for len > 0).
2072 strlcpy(dest, src, len)
2077 size_t ret = strlen(src);
2083 strncpy(dest, src, len - 1);
2091 * strlcat - like strcat/strncat, doesn't overflow destination buffer,
2092 * always leaves destination null-terminated (for len > 0).
2095 strlcat(dest, src, len)
2100 size_t dlen = strlen(dest);
2102 return dlen + strlcpy(dest + dlen, src, (len > dlen? len - dlen: 0));
2106 * logit - does the hard work for fatal et al.
2109 logit(level, fmt, args)
2117 n = vslprintf(buf, sizeof(buf), fmt, args);
2118 syslog(level, "%s", buf);
2119 if (log_to_fd >= 0 && (level != LOG_DEBUG || debug)) {
2120 if (buf[n-1] != '\n')
2122 if (write(log_to_fd, buf, n) != n)
2128 * fatal - log an error message and die horribly.
2131 fatal __V((char *fmt, ...))
2136 va_start(pvar, fmt);
2140 fmt = va_arg(pvar, char *);
2143 logit(LOG_ERR, fmt, pvar);
2146 die(1); /* as promised */
2150 * error - log an error message.
2153 error __V((char *fmt, ...))
2158 va_start(pvar, fmt);
2162 fmt = va_arg(pvar, char *);
2165 logit(LOG_ERR, fmt, pvar);
2170 * warn - log a warning message.
2173 warn __V((char *fmt, ...))
2178 va_start(pvar, fmt);
2182 fmt = va_arg(pvar, char *);
2185 logit(LOG_WARNING, fmt, pvar);
2190 * notice - log a notice-level message.
2193 notice __V((char *fmt, ...))
2198 va_start(pvar, fmt);
2202 fmt = va_arg(pvar, char *);
2205 logit(LOG_NOTICE, fmt, pvar);
2210 * info - log an informational message.
2213 info __V((char *fmt, ...))
2218 va_start(pvar, fmt);
2222 fmt = va_arg(pvar, char *);
2225 logit(LOG_INFO, fmt, pvar);
2230 * dbglog - log a debug message.
2233 dbglog __V((char *fmt, ...))
2238 va_start(pvar, fmt);
2242 fmt = va_arg(pvar, char *);
2245 logit(LOG_DEBUG, fmt, pvar);
2250 * start_charshunt - create a child process to run the character shunt.
2253 start_charshunt(ifd, ofd)
2260 error("Can't fork process for character shunt: %m");
2267 if (getuid() != uid)
2268 fatal("setuid failed");
2272 charshunt(ifd, ofd, record_file);
2275 charshunt_pid = cpid;
2279 record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
2291 * charshunt - the character shunt, which passes characters between
2292 * the pty master side and the serial port (or stdin/stdout).
2293 * This runs as the user (not as root).
2294 * (We assume ofd >= ifd which is true the way this gets called. :-).
2297 charshunt(ifd, ofd, record_file)
2302 fd_set ready, writey;
2303 u_char *ibufp, *obufp;
2306 int pty_readable, stdin_readable;
2307 struct timeval lasttime;
2308 FILE *recordf = NULL;
2311 * Reset signal handlers.
2313 signal(SIGHUP, SIG_IGN); /* Hangup */
2314 signal(SIGINT, SIG_DFL); /* Interrupt */
2315 signal(SIGTERM, SIG_DFL); /* Terminate */
2316 signal(SIGCHLD, SIG_DFL);
2317 signal(SIGUSR1, SIG_DFL);
2318 signal(SIGUSR2, SIG_DFL);
2319 signal(SIGABRT, SIG_DFL);
2320 signal(SIGALRM, SIG_DFL);
2321 signal(SIGFPE, SIG_DFL);
2322 signal(SIGILL, SIG_DFL);
2323 signal(SIGPIPE, SIG_DFL);
2324 signal(SIGQUIT, SIG_DFL);
2325 signal(SIGSEGV, SIG_DFL);
2327 signal(SIGBUS, SIG_DFL);
2330 signal(SIGEMT, SIG_DFL);
2333 signal(SIGPOLL, SIG_DFL);
2336 signal(SIGPROF, SIG_DFL);
2339 signal(SIGSYS, SIG_DFL);
2342 signal(SIGTRAP, SIG_DFL);
2345 signal(SIGVTALRM, SIG_DFL);
2348 signal(SIGXCPU, SIG_DFL);
2351 signal(SIGXFSZ, SIG_DFL);
2355 * Open the record file if required.
2357 if (record_file != NULL) {
2358 recordf = fopen(record_file, "a");
2359 if (recordf == NULL)
2360 error("Couldn't create record file %s: %m", record_file);
2363 /* set all the fds to non-blocking mode */
2364 flags = fcntl(pty_master, F_GETFL);
2366 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
2367 warn("couldn't set pty master to nonblock: %m");
2368 flags = fcntl(ifd, F_GETFL);
2370 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
2371 warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
2373 flags = fcntl(ofd, F_GETFL);
2375 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
2376 warn("couldn't set stdout to nonblock: %m");
2380 ibufp = obufp = NULL;
2381 pty_readable = stdin_readable = 1;
2382 nfds = (ofd > pty_master? ofd: pty_master) + 1;
2383 if (recordf != NULL) {
2384 gettimeofday(&lasttime, NULL);
2385 putc(7, recordf); /* put start marker */
2386 putc(lasttime.tv_sec >> 24, recordf);
2387 putc(lasttime.tv_sec >> 16, recordf);
2388 putc(lasttime.tv_sec >> 8, recordf);
2389 putc(lasttime.tv_sec, recordf);
2390 lasttime.tv_usec = 0;
2393 while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) {
2397 FD_SET(pty_master, &writey);
2398 else if (stdin_readable)
2399 FD_SET(ifd, &ready);
2401 FD_SET(ofd, &writey);
2402 else if (pty_readable)
2403 FD_SET(pty_master, &ready);
2404 if (select(nfds, &ready, &writey, NULL, NULL) < 0) {
2409 if (FD_ISSET(ifd, &ready)) {
2410 ibufp = inpacket_buf;
2411 nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
2412 if (nibuf < 0 && errno == EIO)
2415 if (!(errno == EINTR || errno == EAGAIN)) {
2416 error("Error reading standard input: %m");
2420 } else if (nibuf == 0) {
2421 /* end of file from stdin */
2423 /* do a 0-length write, hopefully this will generate
2424 an EOF (hangup) on the slave side. */
2425 write(pty_master, inpacket_buf, 0);
2427 if (!record_write(recordf, 4, NULL, 0, &lasttime))
2430 FD_SET(pty_master, &writey);
2432 if (!record_write(recordf, 2, ibufp, nibuf, &lasttime))
2436 if (FD_ISSET(pty_master, &ready)) {
2437 obufp = outpacket_buf;
2438 nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
2439 if (nobuf < 0 && errno == EIO)
2442 if (!(errno == EINTR || errno == EAGAIN)) {
2443 error("Error reading pseudo-tty master: %m");
2447 } else if (nobuf == 0) {
2448 /* end of file from the pty - slave side has closed */
2450 stdin_readable = 0; /* pty is not writable now */
2454 if (!record_write(recordf, 3, NULL, 0, &lasttime))
2457 FD_SET(ofd, &writey);
2459 if (!record_write(recordf, 1, obufp, nobuf, &lasttime))
2463 if (FD_ISSET(ofd, &writey)) {
2464 n = write(ofd, obufp, nobuf);
2467 error("Error writing standard output: %m");
2477 if (FD_ISSET(pty_master, &writey)) {
2478 n = write(pty_master, ibufp, nibuf);
2481 error("Error writing pseudo-tty master: %m");
2496 record_write(f, code, buf, nb, tp)
2506 gettimeofday(&now, NULL);
2507 now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
2508 diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
2512 putc(diff >> 24, f);
2513 putc(diff >> 16, f);
2526 fwrite(buf, nb, 1, f);
2530 error("Error writing record file: %m");