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.
20 #define RCSID "$Id: main.c,v 1.85 1999/08/24 05:59:15 paulus Exp $"
35 #include <sys/param.h>
36 #include <sys/types.h>
39 #include <sys/resource.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
55 #include "pathnames.h"
56 #include "patchlevel.h"
64 #endif /* IPX_CHANGE */
69 static const char rcsid[] = RCSID;
72 char ifname[32]; /* Interface name */
73 int ifunit; /* Interface unit number */
75 char *progname; /* Name of this program */
76 char hostname[MAXNAMELEN]; /* Our hostname */
77 static char pidfilename[MAXPATHLEN]; /* name of pid file */
78 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
79 static char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
80 static uid_t uid; /* Our real user-id */
81 static int conn_running; /* we have a [dis]connector running */
83 int ttyfd; /* 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 */
90 struct stat devstat; /* result of stat() on devnam */
91 int prepass = 0; /* doing prepass to find device name */
92 int devnam_fixed; /* set while in options.ttyxx file */
93 volatile int status; /* exit status for pppd */
94 int unsuccess; /* # unsuccessful connection attempts */
96 static int fd_ppp = -1; /* fd for talking PPP */
97 static int fd_loop; /* fd for getting demand-dial packets */
98 static int pty_master; /* fd for master side of pty */
99 static int pty_slave; /* fd for slave side of pty */
100 static int real_ttyfd; /* fd for actual serial port (not pty) */
102 int phase; /* where the link is at */
107 static sigjmp_buf sigjmp;
109 char **script_env; /* Env. variable values for scripts */
110 int s_env_nalloc; /* # words avail at script_env */
112 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
113 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
115 static int n_children; /* # child processes still running */
116 static int got_sigchld; /* set if we have received a SIGCHLD */
118 static int locked; /* lock() has succeeded */
119 static int privopen; /* don't lock, open device as root */
121 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
123 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
124 int ngroups; /* How many groups valid in groups */
126 static struct timeval start_time; /* Time when link was started. */
128 struct pppd_stats link_stats;
129 int link_connect_time;
130 int link_stats_valid;
132 static int charshunt_pid; /* Process ID for charshunt */
135 * We maintain a list of child process pids and
136 * functions to call when they exit.
141 void (*done) __P((void *));
143 struct subprocess *next;
146 static struct subprocess *children;
148 /* Prototypes for procedures local to this file. */
150 static void create_pidfile __P((void));
151 static void create_linkpidfile __P((void));
152 static void cleanup __P((void));
153 static void close_tty __P((void));
154 static void get_input __P((void));
155 static void calltimeout __P((void));
156 static struct timeval *timeleft __P((struct timeval *));
157 static void kill_my_pg __P((int));
158 static void hup __P((int));
159 static void term __P((int));
160 static void chld __P((int));
161 static void toggle_debug __P((int));
162 static void open_ccp __P((int));
163 static void bad_signal __P((int));
164 static void holdoff_end __P((void *));
165 static int device_script __P((char *, int, int, int));
166 static int reap_kids __P((int waitfor));
167 static void record_child __P((int, char *, void (*) (void *), void *));
168 static int start_charshunt __P((int, int));
169 static void charshunt_done __P((void *));
170 static void charshunt __P((int, int, char *));
171 static int record_write __P((FILE *, int code, u_char *buf, int nb,
174 extern char *ttyname __P((int));
175 extern char *getlogin __P((void));
176 int main __P((int, char *[]));
180 #define O_NONBLOCK O_NDELAY
184 #define setlogmask(x)
188 * PPP Data Link Layer "protocol" table.
189 * One entry per supported protocol.
190 * The last entry must be NULL.
192 struct protent *protocols[] = {
224 struct protent *protp;
228 phase = PHASE_INITIALIZE;
231 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
232 * This way we can close 0, 1, 2 in detach() without clobbering
233 * a fd that we are using.
235 if ((i = open("/dev/null", O_RDWR)) >= 0) {
236 while (0 <= i && i <= 2)
244 /* Initialize syslog facilities */
247 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
248 option_error("Couldn't get hostname: %m");
251 hostname[MAXNAMELEN-1] = 0;
254 privileged = uid == 0;
255 slprintf(numbuf, sizeof(numbuf), "%d", uid);
256 script_setenv("ORIG_UID", numbuf);
258 ngroups = getgroups(NGROUPS_MAX, groups);
261 * Initialize magic number generator now so that protocols may
262 * use magic numbers in initialization.
267 * Initialize to the standard option set, then parse, in order,
268 * the system options file, the user's options file,
269 * the tty's options file, and the command line arguments.
271 for (i = 0; (protp = protocols[i]) != NULL; ++i)
277 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
278 || !options_from_user())
279 exit(EXIT_OPTION_ERROR);
281 /* scan command line and options files to find device name */
283 parse_args(argc-1, argv+1);
287 * Work out the device name, if it hasn't already been specified.
289 using_pty = notty || ptycommand != NULL;
290 if (!using_pty && default_device) {
292 if (!isatty(0) || (p = ttyname(0)) == NULL) {
293 option_error("no device specified and stdin is not a tty");
294 exit(EXIT_OPTION_ERROR);
296 strlcpy(devnam, p, sizeof(devnam));
297 if (stat(devnam, &devstat) < 0)
298 fatal("Couldn't stat default device %s: %m", devnam);
302 * Parse the tty options file and the command line.
303 * The per-tty options file should not change
304 * ptycommand, notty or devnam.
308 if (!options_for_tty())
309 exit(EXIT_OPTION_ERROR);
313 if (!parse_args(argc-1, argv+1))
314 exit(EXIT_OPTION_ERROR);
317 * Check that we are running as root.
319 if (geteuid() != 0) {
320 option_error("must be root to run %s, since it is not setuid-root",
325 if (!ppp_available()) {
326 option_error(no_ppp_msg);
327 exit(EXIT_NO_KERNEL_SUPPORT);
331 * Check that the options given are valid and consistent.
333 if (!sys_check_options())
334 exit(EXIT_OPTION_ERROR);
335 auth_check_options();
336 for (i = 0; (protp = protocols[i]) != NULL; ++i)
337 if (protp->check_options != NULL)
338 (*protp->check_options)();
339 if (demand && connector == 0) {
340 option_error("connect script is required for demand-dialling\n");
341 exit(EXIT_OPTION_ERROR);
345 if (!default_device) {
346 option_error("%s option precludes specifying device name",
347 notty? "notty": "pty");
348 exit(EXIT_OPTION_ERROR);
350 if (ptycommand != NULL && notty) {
351 option_error("pty option is incompatible with notty option");
352 exit(EXIT_OPTION_ERROR);
354 default_device = notty;
357 if (notty && log_to_fd <= 1)
361 * If the user has specified a device which is the same as
362 * the one on stdin, pretend they didn't specify any.
363 * If the device is already open read/write on stdin,
364 * we assume we don't need to lock it, and we can open it as root.
366 if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
367 && statbuf.st_rdev == devstat.st_rdev) {
369 fdflags = fcntl(0, F_GETFL);
370 if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
378 * Don't send log messages to the serial port, it tends to
379 * confuse the peer. :-)
381 if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
382 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
385 script_setenv("DEVICE", devnam);
388 * Initialize system-dependent stuff.
392 setlogmask(LOG_UPTO(LOG_DEBUG));
395 * Detach ourselves from the terminal, if required,
396 * and identify who is running us.
398 if (!nodetach && !updetach)
403 if (pw != NULL && pw->pw_name != NULL)
408 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
409 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
410 script_setenv("PPPLOGNAME", p);
413 * Compute mask of all interesting signals and install signal handlers
414 * for each. Only one signal handler may be active at a time. Therefore,
415 * all other signals should be masked when any handler is executing.
418 sigaddset(&mask, SIGHUP);
419 sigaddset(&mask, SIGINT);
420 sigaddset(&mask, SIGTERM);
421 sigaddset(&mask, SIGCHLD);
422 sigaddset(&mask, SIGUSR2);
424 #define SIGNAL(s, handler) do { \
425 sa.sa_handler = handler; \
426 if (sigaction(s, &sa, NULL) < 0) \
427 fatal("Couldn't establish signal handler (%d): %m", s); \
432 SIGNAL(SIGHUP, hup); /* Hangup */
433 SIGNAL(SIGINT, term); /* Interrupt */
434 SIGNAL(SIGTERM, term); /* Terminate */
435 SIGNAL(SIGCHLD, chld);
437 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
438 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
441 * Install a handler for other signals which would otherwise
442 * cause pppd to exit without cleaning up.
444 SIGNAL(SIGABRT, bad_signal);
445 SIGNAL(SIGALRM, bad_signal);
446 SIGNAL(SIGFPE, bad_signal);
447 SIGNAL(SIGILL, bad_signal);
448 SIGNAL(SIGPIPE, bad_signal);
449 SIGNAL(SIGQUIT, bad_signal);
450 SIGNAL(SIGSEGV, bad_signal);
452 SIGNAL(SIGBUS, bad_signal);
455 SIGNAL(SIGEMT, bad_signal);
458 SIGNAL(SIGPOLL, bad_signal);
461 SIGNAL(SIGPROF, bad_signal);
464 SIGNAL(SIGSYS, bad_signal);
467 SIGNAL(SIGTRAP, bad_signal);
470 SIGNAL(SIGVTALRM, bad_signal);
473 SIGNAL(SIGXCPU, bad_signal);
476 SIGNAL(SIGXFSZ, bad_signal);
480 * Apparently we can get a SIGPIPE when we call syslog, if
481 * syslogd has died and been restarted. Ignoring it seems
484 signal(SIGPIPE, SIG_IGN);
488 create_linkpidfile();
491 * If we're doing dial-on-demand, set up the interface now.
495 * Open the loopback channel and set it up to be the ppp interface.
497 fd_loop = open_ppp_loopback();
499 syslog(LOG_INFO, "Using interface ppp%d", ifunit);
500 slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
501 script_setenv("IFNAME", ifname);
503 create_pidfile(); /* write pid to file */
506 * Configure the interface and mark it up, etc.
521 * Don't do anything until we see some activity.
524 phase = PHASE_DORMANT;
528 if (sigsetjmp(sigjmp, 1) == 0) {
529 sigprocmask(SIG_BLOCK, &mask, NULL);
530 if (kill_link || got_sigchld) {
531 sigprocmask(SIG_UNBLOCK, &mask, NULL);
534 sigprocmask(SIG_UNBLOCK, &mask, NULL);
535 wait_input(timeleft(&timo));
545 if (get_loop_output())
551 if (kill_link && !persist)
555 * Now we want to bring up the link.
558 info("Starting link");
561 phase = PHASE_SERIALCONN;
564 * Get a pty master/slave pair if the pty, notty, or record
565 * options were specified.
567 strlcpy(ppp_devnam, devnam, sizeof(ppp_devnam));
570 if (ptycommand != NULL || notty || record_file != NULL) {
571 if (!get_pty(&pty_master, &pty_slave, ppp_devnam, uid)) {
572 error("Couldn't allocate pseudo-tty");
573 status = EXIT_FATAL_ERROR;
576 set_up_tty(pty_slave, 1);
580 * Lock the device if we've been asked to.
582 status = EXIT_LOCK_FAILED;
583 if (lockflag && !privopen) {
584 if (lock(devnam) < 0)
590 * Open the serial device and set it up to be the ppp interface.
591 * First we open it in non-blocking mode so we can set the
592 * various termios flags appropriately. If we aren't dialling
593 * out and we want to use the modem lines, we reopen it later
594 * in order to wait for the carrier detect signal from the modem.
598 if (devnam[0] != 0) {
600 /* If the user specified the device name, become the
601 user before opening it. */
603 if (!devnam_info.priv && !privopen)
605 ttyfd = open(devnam, O_NONBLOCK | O_RDWR, 0);
607 if (!devnam_info.priv && !privopen)
613 error("Failed to open %s: %m", devnam);
614 status = EXIT_OPEN_FAILED;
616 if (!persist || err != EINTR)
619 if ((fdflags = fcntl(ttyfd, F_GETFL)) == -1
620 || fcntl(ttyfd, F_SETFL, fdflags & ~O_NONBLOCK) < 0)
621 warn("Couldn't reset non-blocking mode on device: %m");
624 * Do the equivalent of `mesg n' to stop broadcast messages.
626 if (fstat(ttyfd, &statbuf) < 0
627 || fchmod(ttyfd, statbuf.st_mode & ~(S_IWGRP | S_IWOTH)) < 0) {
628 warn("Couldn't restrict write permissions to %s: %m", devnam);
630 tty_mode = statbuf.st_mode;
633 * Set line speed, flow control, etc.
634 * If we have a non-null connection or initializer script,
635 * on most systems we set CLOCAL for now so that we can talk
636 * to the modem before carrier comes up. But this has the
637 * side effect that we might miss it if CD drops before we
638 * get to clear CLOCAL below. On systems where we can talk
639 * successfully to the modem with CLOCAL clear and CD down,
640 * we could clear CLOCAL at this point.
642 set_up_tty(ttyfd, ((connector != NULL && connector[0] != 0)
643 || initializer != NULL));
648 * If the notty and/or record option was specified,
649 * start up the character shunt now.
651 status = EXIT_PTYCMD_FAILED;
652 if (ptycommand != NULL) {
653 if (record_file != NULL) {
654 int ipipe[2], opipe[2], ok;
656 if (pipe(ipipe) < 0 || pipe(opipe) < 0)
657 fatal("Couldn't create pipes for record option: %m");
658 ok = device_script(ptycommand, opipe[0], ipipe[1], 1) == 0
659 && start_charshunt(ipipe[0], opipe[1]);
667 if (device_script(ptycommand, pty_master, pty_master, 1) < 0)
674 if (!start_charshunt(0, 1))
676 } else if (record_file != NULL) {
677 if (!start_charshunt(ttyfd, ttyfd))
681 /* run connection script */
682 if ((connector && connector[0]) || initializer) {
683 if (real_ttyfd != -1) {
684 if (!default_device && modem) {
685 setdtr(real_ttyfd, 0); /* in case modem is off hook */
687 setdtr(real_ttyfd, 1);
691 if (initializer && initializer[0]) {
692 if (device_script(initializer, ttyfd, ttyfd, 0) < 0) {
693 error("Initializer script failed");
694 status = EXIT_INIT_FAILED;
700 info("Serial port initialized.");
703 if (connector && connector[0]) {
704 if (device_script(connector, ttyfd, ttyfd, 0) < 0) {
705 error("Connect script failed");
706 status = EXIT_CONNECT_FAILED;
712 info("Serial connection established.");
715 /* set line speed, flow control, etc.;
716 clear CLOCAL if modem option */
717 if (real_ttyfd != -1)
718 set_up_tty(real_ttyfd, 0);
721 /* reopen tty if necessary to wait for carrier */
722 if (connector == NULL && modem && devnam[0] != 0) {
724 if ((i = open(devnam, O_RDWR)) >= 0)
726 if (errno != EINTR) {
727 error("Failed to reopen %s: %m", devnam);
728 status = EXIT_OPEN_FAILED;
730 if (!persist || errno != EINTR || hungup || kill_link)
736 slprintf(numbuf, sizeof(numbuf), "%d", baud_rate);
737 script_setenv("SPEED", numbuf);
739 /* run welcome script, if any */
740 if (welcomer && welcomer[0]) {
741 if (device_script(welcomer, ttyfd, ttyfd, 0) < 0)
742 warn("Welcome script failed");
745 /* set up the serial device as a ppp interface */
746 fd_ppp = establish_ppp(ttyfd);
748 status = EXIT_FATAL_ERROR;
754 info("Using interface ppp%d", ifunit);
755 slprintf(ifname, sizeof(ifname), "ppp%d", ifunit);
756 script_setenv("IFNAME", ifname);
758 create_pidfile(); /* write pid to file */
762 * Start opening the connection and wait for
763 * incoming events (reply, timeout, etc.).
765 notice("Connect: %s <--> %s", ifname, ppp_devnam);
766 gettimeofday(&start_time, NULL);
767 link_stats_valid = 0;
768 script_unsetenv("CONNECT_TIME");
769 script_unsetenv("BYTES_SENT");
770 script_unsetenv("BYTES_RCVD");
774 * If we are initiating this connection, wait for a short
775 * time for something from the peer. This can avoid bouncing
776 * our packets off his tty before he has it set up.
778 if (connector != NULL || ptycommand != NULL) {
785 lcp_open(0); /* Start protocol */
788 status = EXIT_NEGOTIATION_FAILED;
789 for (phase = PHASE_ESTABLISH; phase != PHASE_DEAD; ) {
790 if (sigsetjmp(sigjmp, 1) == 0) {
791 sigprocmask(SIG_BLOCK, &mask, NULL);
792 if (kill_link || open_ccp_flag || got_sigchld) {
793 sigprocmask(SIG_UNBLOCK, &mask, NULL);
796 sigprocmask(SIG_UNBLOCK, &mask, NULL);
797 wait_input(timeleft(&timo));
804 lcp_close(0, "User request");
808 if (phase == PHASE_NETWORK) {
809 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
810 (*ccp_protent.open)(0);
815 reap_kids(0); /* Don't leave dead kids lying around */
819 * Print connect time and statistics.
821 if (link_stats_valid) {
822 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
823 info("Connect time %d.%d minutes.", t/10, t%10);
824 info("Sent %d bytes, received %d bytes.",
825 link_stats.bytes_out, link_stats.bytes_in);
829 * Delete pid file before disestablishing ppp. Otherwise it
830 * can happen that another pppd gets the same unit and then
831 * we delete its pid file.
834 if (pidfilename[0] != 0
835 && unlink(pidfilename) < 0 && errno != ENOENT)
836 warn("unable to delete pid file %s: %m", pidfilename);
841 * If we may want to bring the link up again, transfer
842 * the ppp unit back to the loopback. Set the
843 * real serial device back to its normal mode of operation.
849 disestablish_ppp(ttyfd);
855 * Run disconnector script, if requested.
856 * XXX we may not be able to do this if the line has hung up!
859 if (disconnector && !hungup) {
861 set_up_tty(real_ttyfd, 1);
862 if (device_script(disconnector, ttyfd, ttyfd, 0) < 0) {
863 warn("disconnect script failed");
865 info("Serial link disconnected.");
882 if (pidfilename[0] != 0
883 && unlink(pidfilename) < 0 && errno != ENOENT)
884 warn("unable to delete pid file %s: %m", pidfilename);
888 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
894 if (holdoff > 0 && need_holdoff) {
895 phase = PHASE_HOLDOFF;
896 TIMEOUT(holdoff_end, NULL, holdoff);
898 if (sigsetjmp(sigjmp, 1) == 0) {
899 sigprocmask(SIG_BLOCK, &mask, NULL);
900 if (kill_link || got_sigchld) {
901 sigprocmask(SIG_UNBLOCK, &mask, NULL);
904 sigprocmask(SIG_UNBLOCK, &mask, NULL);
905 wait_input(timeleft(&timo));
912 phase = PHASE_DORMANT; /* allow signal to end holdoff */
916 } while (phase == PHASE_HOLDOFF);
922 /* Wait for scripts to finish */
923 /* XXX should have a timeout here */
924 while (n_children > 0) {
926 struct subprocess *chp;
927 dbglog("Waiting for %d child processes...", n_children);
928 for (chp = children; chp != NULL; chp = chp->next)
929 dbglog(" script %s, pid %d", chp->prog, chp->pid);
931 if (reap_kids(1) < 0)
940 * detach - detach us from the controlling terminal.
949 if ((pid = fork()) < 0) {
950 error("Couldn't detach (fork failed: %m)");
951 die(1); /* or just return? */
957 exit(0); /* parent dies */
966 /* update pid files if they have been written already */
970 create_linkpidfile();
974 * reopen_log - (re)open our connection to syslog.
980 openlog("pppd", LOG_PID);
982 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
983 setlogmask(LOG_UPTO(LOG_INFO));
988 * Create a file containing our process ID.
996 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
997 _PATH_VARRUN, ifname);
998 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
999 fprintf(pidfile, "%d\n", getpid());
1000 (void) fclose(pidfile);
1002 error("Failed to create pid file %s: %m", pidfilename);
1005 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
1006 script_setenv("PPPD_PID", numbuf);
1008 create_linkpidfile();
1012 create_linkpidfile()
1016 if (linkname[0] == 0)
1018 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
1019 _PATH_VARRUN, linkname);
1020 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
1021 fprintf(pidfile, "%d\n", getpid());
1023 fprintf(pidfile, "%s\n", ifname);
1024 (void) fclose(pidfile);
1026 error("Failed to create pid file %s: %m", linkpidfile);
1029 script_setenv("LINKNAME", linkname);
1033 * holdoff_end - called via a timeout when the holdoff period ends.
1039 phase = PHASE_DORMANT;
1043 * get_input - called when incoming data is available.
1051 struct protent *protp;
1053 p = inpacket_buf; /* point to beginning of packet buffer */
1055 len = read_packet(inpacket_buf);
1060 notice("Modem hangup");
1062 status = EXIT_HANGUP;
1063 lcp_lowerdown(0); /* serial link is no longer available */
1068 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1069 dbglog("rcvd %P", p, len);
1071 if (len < PPP_HDRLEN) {
1072 MAINDEBUG(("io(): Received short packet."));
1076 p += 2; /* Skip address and control */
1077 GETSHORT(protocol, p);
1081 * Toss all non-LCP packets unless LCP is OPEN.
1083 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1084 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
1089 * Until we get past the authentication phase, toss all packets
1090 * except LCP, LQR and authentication packets.
1092 if (phase <= PHASE_AUTHENTICATE
1093 && !(protocol == PPP_LCP || protocol == PPP_LQR
1094 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
1095 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
1101 * Upcall the proper protocol input routine.
1103 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1104 if (protp->protocol == protocol && protp->enabled_flag) {
1105 (*protp->input)(0, p, len);
1108 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1109 && protp->datainput != NULL) {
1110 (*protp->datainput)(0, p, len);
1116 warn("Unsupported protocol (0x%x) received", protocol);
1117 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1122 * die - clean up state and exit with the specified status.
1129 syslog(LOG_INFO, "Exit.");
1134 * cleanup - restore anything which needs to be restored before we exit
1143 disestablish_ppp(ttyfd);
1144 if (real_ttyfd >= 0)
1147 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1148 warn("unable to delete pid file %s: %m", pidfilename);
1150 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1151 warn("unable to delete pid file %s: %m", linkpidfile);
1159 * close_tty - restore the terminal device and close it.
1164 /* drop dtr to hang up */
1165 if (!default_device && modem) {
1166 setdtr(real_ttyfd, 0);
1168 * This sleep is in case the serial port has CLOCAL set by default,
1169 * and consequently will reassert DTR when we close the device.
1174 restore_tty(real_ttyfd);
1176 if (tty_mode != (mode_t) -1) {
1177 if (fchmod(real_ttyfd, tty_mode) != 0) {
1178 /* XXX if devnam is a symlink, this will change the link */
1179 chmod(devnam, tty_mode);
1188 * update_link_stats - get stats at link termination.
1191 update_link_stats(u)
1197 if (!get_ppp_stats(u, &link_stats)
1198 || gettimeofday(&now, NULL) < 0)
1200 link_connect_time = now.tv_sec - start_time.tv_sec;
1201 link_stats_valid = 1;
1203 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1204 script_setenv("CONNECT_TIME", numbuf);
1205 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1206 script_setenv("BYTES_SENT", numbuf);
1207 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1208 script_setenv("BYTES_RCVD", numbuf);
1213 struct timeval c_time; /* time at which to call routine */
1214 void *c_arg; /* argument to routine */
1215 void (*c_func) __P((void *)); /* routine */
1216 struct callout *c_next;
1219 static struct callout *callout = NULL; /* Callout list */
1220 static struct timeval timenow; /* Current time */
1223 * timeout - Schedule a timeout.
1225 * Note that this timeout takes the number of seconds, NOT hz (as in
1229 timeout(func, arg, time)
1230 void (*func) __P((void *));
1234 struct callout *newp, *p, **pp;
1236 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1241 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1242 fatal("Out of memory in timeout()!");
1244 newp->c_func = func;
1245 gettimeofday(&timenow, NULL);
1246 newp->c_time.tv_sec = timenow.tv_sec + time;
1247 newp->c_time.tv_usec = timenow.tv_usec;
1250 * Find correct place and link it in.
1252 for (pp = &callout; (p = *pp); pp = &p->c_next)
1253 if (newp->c_time.tv_sec < p->c_time.tv_sec
1254 || (newp->c_time.tv_sec == p->c_time.tv_sec
1255 && newp->c_time.tv_usec < p->c_time.tv_usec))
1263 * untimeout - Unschedule a timeout.
1266 untimeout(func, arg)
1267 void (*func) __P((void *));
1270 struct callout **copp, *freep;
1272 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1275 * Find first matching timeout and remove it from the list.
1277 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1278 if (freep->c_func == func && freep->c_arg == arg) {
1279 *copp = freep->c_next;
1280 (void) free((char *) freep);
1287 * calltimeout - Call any timeout routines which are now due.
1294 while (callout != NULL) {
1297 if (gettimeofday(&timenow, NULL) < 0)
1298 fatal("Failed to get time of day: %m");
1299 if (!(p->c_time.tv_sec < timenow.tv_sec
1300 || (p->c_time.tv_sec == timenow.tv_sec
1301 && p->c_time.tv_usec <= timenow.tv_usec)))
1302 break; /* no, it's not time yet */
1304 callout = p->c_next;
1305 (*p->c_func)(p->c_arg);
1313 * timeleft - return the length of time until the next timeout is due.
1315 static struct timeval *
1317 struct timeval *tvp;
1319 if (callout == NULL)
1322 gettimeofday(&timenow, NULL);
1323 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1324 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1325 if (tvp->tv_usec < 0) {
1326 tvp->tv_usec += 1000000;
1329 if (tvp->tv_sec < 0)
1330 tvp->tv_sec = tvp->tv_usec = 0;
1337 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1343 struct sigaction act, oldact;
1345 act.sa_handler = SIG_IGN;
1348 sigaction(sig, &act, &oldact);
1349 sigaction(sig, &oldact, NULL);
1354 * hup - Catch SIGHUP signal.
1356 * Indicates that the physical layer has been disconnected.
1357 * We don't rely on this indication; if the user has sent this
1358 * signal, we just take the link down.
1364 info("Hangup (SIGHUP)");
1366 if (status != EXIT_HANGUP)
1367 status = EXIT_USER_REQUEST;
1369 /* Send the signal to the [dis]connector process(es) also */
1372 kill(charshunt_pid, sig);
1374 siglongjmp(sigjmp, 1);
1379 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1381 * Indicates that we should initiate a graceful disconnect and exit.
1388 info("Terminating on signal %d.", sig);
1389 persist = 0; /* don't try to restart */
1391 status = EXIT_USER_REQUEST;
1393 /* Send the signal to the [dis]connector process(es) also */
1396 kill(charshunt_pid, sig);
1398 siglongjmp(sigjmp, 1);
1403 * chld - Catch SIGCHLD signal.
1404 * Sets a flag so we will call reap_kids in the mainline.
1412 siglongjmp(sigjmp, 1);
1417 * toggle_debug - Catch SIGUSR1 signal.
1419 * Toggle debug flag.
1428 setlogmask(LOG_UPTO(LOG_DEBUG));
1430 setlogmask(LOG_UPTO(LOG_WARNING));
1436 * open_ccp - Catch SIGUSR2 signal.
1438 * Try to (re)negotiate compression.
1447 siglongjmp(sigjmp, 1);
1452 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1458 static int crashed = 0;
1463 error("Fatal signal %d", sig);
1465 kill_my_pg(SIGTERM);
1467 kill(charshunt_pid, SIGTERM);
1473 * device_script - run a program to talk to the serial device
1474 * (e.g. to run the connector or disconnector script).
1477 device_script(program, in, out, dont_wait)
1491 error("Failed to create child process: %m");
1500 int newin = dup(in);
1504 } else if (out == 2) {
1507 if (log_to_fd >= 0) {
1512 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1513 if (errfd >= 0 && errfd != 2) {
1533 if (getuid() != uid) {
1534 error("setuid failed");
1538 execl("/bin/sh", "sh", "-c", program, (char *)0);
1539 error("could not exec /bin/sh: %m");
1545 record_child(pid, program, NULL, NULL);
1548 while (waitpid(pid, &status, 0) < 0) {
1551 fatal("error waiting for (dis)connection process: %m");
1556 return (status == 0 ? 0 : -1);
1561 * run-program - execute a program with given arguments,
1562 * but don't wait for it.
1563 * If the program can't be executed, logs an error unless
1564 * must_exist is 0 and the program file doesn't exist.
1565 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1566 * or isn't an executable plain file, or the process ID of the child.
1567 * If done != NULL, (*done)(arg) will be called later (within
1568 * reap_kids) iff the return value is > 0.
1571 run_program(prog, args, must_exist, done, arg)
1575 void (*done) __P((void *));
1582 * First check if the file exists and is executable.
1583 * We don't use access() because that would use the
1584 * real user-id, which might not be root, and the script
1585 * might be accessible only to root.
1588 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1589 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1590 if (must_exist || errno != ENOENT)
1591 warn("Can't execute %s: %m", prog);
1597 error("Failed to create child process for %s: %m", prog);
1603 /* Leave the current location */
1604 (void) setsid(); /* No controlling tty. */
1605 (void) umask (S_IRWXG|S_IRWXO);
1606 (void) chdir ("/"); /* no current directory. */
1607 setuid(0); /* set real UID = root */
1610 /* Ensure that nothing of our device environment is inherited. */
1616 close (ttyfd); /* tty interface to the ppp device */
1617 if (real_ttyfd >= 0)
1620 /* Don't pass handles to the PPP device, even by accident. */
1621 new_fd = open (_PATH_DEVNULL, O_RDWR);
1624 dup2 (new_fd, 0); /* stdin <- /dev/null */
1627 dup2 (0, 1); /* stdout -> /dev/null */
1628 dup2 (0, 2); /* stderr -> /dev/null */
1632 /* Force the priority back to zero if pppd is running higher. */
1633 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1634 warn("can't reset priority to 0: %m");
1637 /* SysV recommends a second fork at this point. */
1639 /* run the program */
1640 execve(prog, args, script_env);
1641 if (must_exist || errno != ENOENT) {
1642 /* have to reopen the log, there's nowhere else
1643 for the message to go. */
1645 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1652 dbglog("Script %s started (pid %d)", prog, pid);
1653 record_child(pid, prog, done, arg);
1660 * record_child - add a child process to the list for reap_kids
1664 record_child(pid, prog, done, arg)
1667 void (*done) __P((void *));
1670 struct subprocess *chp;
1674 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1676 warn("losing track of %s process", prog);
1682 chp->next = children;
1689 * reap_kids - get status from any dead child processes,
1690 * and log a message for abnormal terminations.
1697 struct subprocess *chp, **prevp;
1700 if (n_children == 0)
1702 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1705 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1706 if (chp->pid == pid) {
1711 if (WIFSIGNALED(status)) {
1712 warn("Child process %s (pid %d) terminated with signal %d",
1713 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1715 dbglog("Script %s finished (pid %d), status = 0x%x",
1716 (chp? chp->prog: "??"), pid, status);
1717 if (chp && chp->done)
1718 (*chp->done)(chp->arg);
1723 if (errno == ECHILD)
1726 error("Error waiting for child process: %m");
1733 * novm - log an error message saying we ran out of memory, and die.
1739 fatal("Virtual memory exhausted allocating %s\n", msg);
1743 * script_setenv - set an environment variable value to be used
1744 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1747 script_setenv(var, value)
1750 size_t vl = strlen(var) + strlen(value) + 2;
1752 char *p, *newstring;
1754 newstring = (char *) malloc(vl);
1757 slprintf(newstring, vl, "%s=%s", var, value);
1759 /* check if this variable is already set */
1760 if (script_env != 0) {
1761 for (i = 0; (p = script_env[i]) != 0; ++i) {
1762 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1764 script_env[i] = newstring;
1770 script_env = (char **) malloc(16 * sizeof(char *));
1771 if (script_env == 0)
1776 /* reallocate script_env with more space if needed */
1777 if (i + 1 >= s_env_nalloc) {
1779 char **newenv = (char **) realloc((void *)script_env,
1780 new_n * sizeof(char *));
1783 script_env = newenv;
1784 s_env_nalloc = new_n;
1787 script_env[i] = newstring;
1788 script_env[i+1] = 0;
1792 * script_unsetenv - remove a variable from the environment
1796 script_unsetenv(var)
1799 int vl = strlen(var);
1803 if (script_env == 0)
1805 for (i = 0; (p = script_env[i]) != 0; ++i) {
1806 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1808 while ((script_env[i] = script_env[i+1]) != 0)
1816 * start_charshunt - create a child process to run the character shunt.
1819 start_charshunt(ifd, ofd)
1826 error("Can't fork process for character shunt: %m");
1833 if (getuid() != uid)
1834 fatal("setuid failed");
1838 charshunt(ifd, ofd, record_file);
1841 charshunt_pid = cpid;
1845 record_child(cpid, "pppd (charshunt)", charshunt_done, NULL);
1857 * charshunt - the character shunt, which passes characters between
1858 * the pty master side and the serial port (or stdin/stdout).
1859 * This runs as the user (not as root).
1860 * (We assume ofd >= ifd which is true the way this gets called. :-).
1863 charshunt(ifd, ofd, record_file)
1868 fd_set ready, writey;
1869 u_char *ibufp, *obufp;
1872 int pty_readable, stdin_readable;
1873 struct timeval lasttime;
1874 FILE *recordf = NULL;
1877 * Reset signal handlers.
1879 signal(SIGHUP, SIG_IGN); /* Hangup */
1880 signal(SIGINT, SIG_DFL); /* Interrupt */
1881 signal(SIGTERM, SIG_DFL); /* Terminate */
1882 signal(SIGCHLD, SIG_DFL);
1883 signal(SIGUSR1, SIG_DFL);
1884 signal(SIGUSR2, SIG_DFL);
1885 signal(SIGABRT, SIG_DFL);
1886 signal(SIGALRM, SIG_DFL);
1887 signal(SIGFPE, SIG_DFL);
1888 signal(SIGILL, SIG_DFL);
1889 signal(SIGPIPE, SIG_DFL);
1890 signal(SIGQUIT, SIG_DFL);
1891 signal(SIGSEGV, SIG_DFL);
1893 signal(SIGBUS, SIG_DFL);
1896 signal(SIGEMT, SIG_DFL);
1899 signal(SIGPOLL, SIG_DFL);
1902 signal(SIGPROF, SIG_DFL);
1905 signal(SIGSYS, SIG_DFL);
1908 signal(SIGTRAP, SIG_DFL);
1911 signal(SIGVTALRM, SIG_DFL);
1914 signal(SIGXCPU, SIG_DFL);
1917 signal(SIGXFSZ, SIG_DFL);
1921 * Open the record file if required.
1923 if (record_file != NULL) {
1924 recordf = fopen(record_file, "a");
1925 if (recordf == NULL)
1926 error("Couldn't create record file %s: %m", record_file);
1929 /* set all the fds to non-blocking mode */
1930 flags = fcntl(pty_master, F_GETFL);
1932 || fcntl(pty_master, F_SETFL, flags | O_NONBLOCK) == -1)
1933 warn("couldn't set pty master to nonblock: %m");
1934 flags = fcntl(ifd, F_GETFL);
1936 || fcntl(ifd, F_SETFL, flags | O_NONBLOCK) == -1)
1937 warn("couldn't set %s to nonblock: %m", (ifd==0? "stdin": "tty"));
1939 flags = fcntl(ofd, F_GETFL);
1941 || fcntl(ofd, F_SETFL, flags | O_NONBLOCK) == -1)
1942 warn("couldn't set stdout to nonblock: %m");
1946 ibufp = obufp = NULL;
1947 pty_readable = stdin_readable = 1;
1948 nfds = (ofd > pty_master? ofd: pty_master) + 1;
1949 if (recordf != NULL) {
1950 gettimeofday(&lasttime, NULL);
1951 putc(7, recordf); /* put start marker */
1952 putc(lasttime.tv_sec >> 24, recordf);
1953 putc(lasttime.tv_sec >> 16, recordf);
1954 putc(lasttime.tv_sec >> 8, recordf);
1955 putc(lasttime.tv_sec, recordf);
1956 lasttime.tv_usec = 0;
1959 while (nibuf != 0 || nobuf != 0 || pty_readable || stdin_readable) {
1963 FD_SET(pty_master, &writey);
1964 else if (stdin_readable)
1965 FD_SET(ifd, &ready);
1967 FD_SET(ofd, &writey);
1968 else if (pty_readable)
1969 FD_SET(pty_master, &ready);
1970 if (select(nfds, &ready, &writey, NULL, NULL) < 0) {
1975 if (FD_ISSET(ifd, &ready)) {
1976 ibufp = inpacket_buf;
1977 nibuf = read(ifd, ibufp, sizeof(inpacket_buf));
1978 if (nibuf < 0 && errno == EIO)
1981 if (!(errno == EINTR || errno == EAGAIN)) {
1982 error("Error reading standard input: %m");
1986 } else if (nibuf == 0) {
1987 /* end of file from stdin */
1989 /* do a 0-length write, hopefully this will generate
1990 an EOF (hangup) on the slave side. */
1991 write(pty_master, inpacket_buf, 0);
1993 if (!record_write(recordf, 4, NULL, 0, &lasttime))
1996 FD_SET(pty_master, &writey);
1998 if (!record_write(recordf, 2, ibufp, nibuf, &lasttime))
2002 if (FD_ISSET(pty_master, &ready)) {
2003 obufp = outpacket_buf;
2004 nobuf = read(pty_master, obufp, sizeof(outpacket_buf));
2005 if (nobuf < 0 && errno == EIO)
2008 if (!(errno == EINTR || errno == EAGAIN)) {
2009 error("Error reading pseudo-tty master: %m");
2013 } else if (nobuf == 0) {
2014 /* end of file from the pty - slave side has closed */
2016 stdin_readable = 0; /* pty is not writable now */
2020 if (!record_write(recordf, 3, NULL, 0, &lasttime))
2023 FD_SET(ofd, &writey);
2025 if (!record_write(recordf, 1, obufp, nobuf, &lasttime))
2029 if (FD_ISSET(ofd, &writey)) {
2030 n = write(ofd, obufp, nobuf);
2033 error("Error writing standard output: %m");
2043 if (FD_ISSET(pty_master, &writey)) {
2044 n = write(pty_master, ibufp, nibuf);
2047 error("Error writing pseudo-tty master: %m");
2062 record_write(f, code, buf, nb, tp)
2072 gettimeofday(&now, NULL);
2073 now.tv_usec /= 100000; /* actually 1/10 s, not usec now */
2074 diff = (now.tv_sec - tp->tv_sec) * 10 + (now.tv_usec - tp->tv_usec);
2078 putc(diff >> 24, f);
2079 putc(diff >> 16, f);
2092 fwrite(buf, nb, 1, f);
2096 error("Error writing record file: %m");