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 1.100 2000/07/06 11:17:02 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>
43 #include <arpa/inet.h>
56 #include "pathnames.h"
57 #include "patchlevel.h"
66 #endif /* IPX_CHANGE */
71 static const char rcsid[] = RCSID;
74 char ifname[32]; /* Interface name */
75 int ifunit; /* Interface unit number */
77 char *progname; /* Name of this program */
78 char hostname[MAXNAMELEN]; /* Our hostname */
79 static char pidfilename[MAXPATHLEN]; /* name of pid file */
80 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
81 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
82 uid_t uid; /* Our real user-id */
83 struct notifier *pidchange = NULL;
84 struct notifier *phasechange = NULL;
85 struct notifier *exitnotify = NULL;
86 struct notifier *sigreceived = NULL;
88 int hungup; /* terminal has been hung up */
89 int privileged; /* we're running as real uid root */
90 int need_holdoff; /* need holdoff period before restarting */
91 int detached; /* have detached from terminal */
92 volatile int status; /* exit status for pppd */
93 int unsuccess; /* # unsuccessful connection attempts */
94 int do_callback; /* != 0 if we should do callback next */
95 int doing_callback; /* != 0 if we are doing callback */
96 TDB_CONTEXT *pppdb; /* database for storing status etc. */
99 int (*holdoff_hook) __P((void)) = NULL;
100 int (*new_phase_hook) __P((int)) = NULL;
102 static int conn_running; /* we have a [dis]connector running */
103 static int devfd; /* fd of underlying device */
104 static int fd_ppp = -1; /* fd for talking PPP */
105 static int fd_loop; /* fd for getting demand-dial packets */
107 int phase; /* where the link is at */
113 static sigjmp_buf sigjmp;
115 char **script_env; /* Env. variable values for scripts */
116 int s_env_nalloc; /* # words avail at script_env */
118 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
119 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
121 static int n_children; /* # child processes still running */
122 static int got_sigchld; /* set if we have received a SIGCHLD */
124 int privopen; /* don't lock, open device as root */
126 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
128 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
129 int ngroups; /* How many groups valid in groups */
131 static struct timeval start_time; /* Time when link was started. */
133 struct pppd_stats link_stats;
134 int link_connect_time;
135 int link_stats_valid;
138 * We maintain a list of child process pids and
139 * functions to call when they exit.
144 void (*done) __P((void *));
146 struct subprocess *next;
149 static struct subprocess *children;
151 /* Prototypes for procedures local to this file. */
153 static void setup_signals __P((void));
154 static void create_pidfile __P((void));
155 static void create_linkpidfile __P((void));
156 static void cleanup __P((void));
157 static void get_input __P((void));
158 static void calltimeout __P((void));
159 static struct timeval *timeleft __P((struct timeval *));
160 static void kill_my_pg __P((int));
161 static void hup __P((int));
162 static void term __P((int));
163 static void chld __P((int));
164 static void toggle_debug __P((int));
165 static void open_ccp __P((int));
166 static void bad_signal __P((int));
167 static void holdoff_end __P((void *));
168 static int reap_kids __P((int waitfor));
169 static void update_db_entry __P((void));
170 static void add_db_key __P((const char *));
171 static void delete_db_key __P((const char *));
172 static void cleanup_db __P((void));
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[] = {
214 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
216 #if !defined(PPP_DRV_NAME)
217 #define PPP_DRV_NAME "ppp"
218 #endif /* !defined(PPP_DRV_NAME) */
230 struct protent *protp;
233 new_phase(PHASE_INITIALIZE);
236 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
237 * This way we can close 0, 1, 2 in detach() without clobbering
238 * a fd that we are using.
240 if ((i = open("/dev/null", O_RDWR)) >= 0) {
241 while (0 <= i && i <= 2)
249 /* Initialize syslog facilities */
252 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
253 option_error("Couldn't get hostname: %m");
256 hostname[MAXNAMELEN-1] = 0;
258 /* make sure we don't create world or group writable files. */
259 umask(umask(0777) | 022);
262 privileged = uid == 0;
263 slprintf(numbuf, sizeof(numbuf), "%d", uid);
264 script_setenv("ORIG_UID", numbuf, 0);
266 ngroups = getgroups(NGROUPS_MAX, groups);
269 * Initialize magic number generator now so that protocols may
270 * use magic numbers in initialization.
275 * Initialize each protocol.
277 for (i = 0; (protp = protocols[i]) != NULL; ++i)
284 * Parse, in order, the system options file, the user's options file,
285 * and the command line arguments.
287 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
288 || !options_from_user()
289 || !parse_args(argc-1, argv+1))
290 exit(EXIT_OPTION_ERROR);
293 * Work out the device name, if it hasn't already been specified,
294 * and parse the tty's options file.
299 * Check that we are running as root.
301 if (geteuid() != 0) {
302 option_error("must be root to run %s, since it is not setuid-root",
307 if (!ppp_available()) {
308 option_error(no_ppp_msg);
309 exit(EXIT_NO_KERNEL_SUPPORT);
313 * Check that the options given are valid and consistent.
315 if (!sys_check_options())
316 exit(EXIT_OPTION_ERROR);
317 auth_check_options();
318 #ifdef HAVE_MULTILINK
321 for (i = 0; (protp = protocols[i]) != NULL; ++i)
322 if (protp->check_options != NULL)
323 (*protp->check_options)();
327 * Initialize system-dependent stuff.
331 setlogmask(LOG_UPTO(LOG_DEBUG));
333 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
335 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
338 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
340 warn("Warning: disabling multilink");
346 * Detach ourselves from the terminal, if required,
347 * and identify who is running us.
349 if (!nodetach && !updetach)
354 if (pw != NULL && pw->pw_name != NULL)
359 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
360 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
361 script_setenv("PPPLOGNAME", p, 0);
364 script_setenv("DEVICE", devnam, 1);
365 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
366 script_setenv("PPPD_PID", numbuf, 1);
372 create_linkpidfile();
375 * If we're doing dial-on-demand, set up the interface now.
379 * Open the loopback channel and set it up to be the ppp interface.
381 tdb_writelock(pppdb);
382 fd_loop = open_ppp_loopback();
384 tdb_writeunlock(pppdb);
387 * Configure the interface and mark it up, etc.
400 doing_callback = do_callback;
403 if (demand && !doing_callback) {
405 * Don't do anything until we see some activity.
408 new_phase(PHASE_DORMANT);
412 if (sigsetjmp(sigjmp, 1) == 0) {
413 sigprocmask(SIG_BLOCK, &mask, NULL);
414 if (kill_link || got_sigchld) {
415 sigprocmask(SIG_UNBLOCK, &mask, NULL);
418 sigprocmask(SIG_UNBLOCK, &mask, NULL);
419 wait_input(timeleft(&timo));
429 if (get_loop_output())
435 if (kill_link && !persist)
439 * Now we want to bring up the link.
442 info("Starting link");
445 new_phase(PHASE_SERIALCONN);
447 devfd = connect_tty();
451 /* set up the serial device as a ppp interface */
452 tdb_writelock(pppdb);
453 fd_ppp = establish_ppp(devfd);
455 tdb_writeunlock(pppdb);
456 status = EXIT_FATAL_ERROR;
460 if (!demand && ifunit >= 0)
462 tdb_writeunlock(pppdb);
465 * Start opening the connection and wait for
466 * incoming events (reply, timeout, etc.).
468 notice("Connect: %s <--> %s", ifname, ppp_devnam);
469 gettimeofday(&start_time, NULL);
470 link_stats_valid = 0;
471 script_unsetenv("CONNECT_TIME");
472 script_unsetenv("BYTES_SENT");
473 script_unsetenv("BYTES_RCVD");
477 * If we are initiating this connection, wait for a short
478 * time for something from the peer. This can avoid bouncing
479 * our packets off his tty before he has it set up.
482 if (listen_time != 0) {
484 t.tv_sec = listen_time / 1000;
485 t.tv_usec = listen_time % 1000;
489 lcp_open(0); /* Start protocol */
491 status = EXIT_NEGOTIATION_FAILED;
492 new_phase(PHASE_ESTABLISH);
493 while (phase != PHASE_DEAD) {
494 if (sigsetjmp(sigjmp, 1) == 0) {
495 sigprocmask(SIG_BLOCK, &mask, NULL);
496 if (kill_link || open_ccp_flag || got_sigchld) {
497 sigprocmask(SIG_UNBLOCK, &mask, NULL);
500 sigprocmask(SIG_UNBLOCK, &mask, NULL);
501 wait_input(timeleft(&timo));
508 lcp_close(0, "User request");
512 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
513 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
514 (*ccp_protent.open)(0);
519 reap_kids(0); /* Don't leave dead kids lying around */
523 * Print connect time and statistics.
525 if (link_stats_valid) {
526 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
527 info("Connect time %d.%d minutes.", t/10, t%10);
528 info("Sent %d bytes, received %d bytes.",
529 link_stats.bytes_out, link_stats.bytes_in);
533 * Delete pid file before disestablishing ppp. Otherwise it
534 * can happen that another pppd gets the same unit and then
535 * we delete its pid file.
538 if (pidfilename[0] != 0
539 && unlink(pidfilename) < 0 && errno != ENOENT)
540 warn("unable to delete pid file %s: %m", pidfilename);
545 * If we may want to bring the link up again, transfer
546 * the ppp unit back to the loopback. Set the
547 * real serial device back to its normal mode of operation.
553 disestablish_ppp(devfd);
558 script_unsetenv("IFNAME");
561 * Run disconnector script, if requested.
562 * XXX we may not be able to do this if the line has hung up!
565 new_phase(PHASE_DISCONNECT);
572 if (pidfilename[0] != 0
573 && unlink(pidfilename) < 0 && errno != ENOENT)
574 warn("unable to delete pid file %s: %m", pidfilename);
578 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
584 t = need_holdoff? holdoff: 0;
586 t = (*holdoff_hook)();
588 new_phase(PHASE_HOLDOFF);
589 TIMEOUT(holdoff_end, NULL, t);
591 if (sigsetjmp(sigjmp, 1) == 0) {
592 sigprocmask(SIG_BLOCK, &mask, NULL);
593 if (kill_link || got_sigchld) {
594 sigprocmask(SIG_UNBLOCK, &mask, NULL);
597 sigprocmask(SIG_UNBLOCK, &mask, NULL);
598 wait_input(timeleft(&timo));
605 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
609 } while (phase == PHASE_HOLDOFF);
615 /* Wait for scripts to finish */
616 /* XXX should have a timeout here */
617 while (n_children > 0) {
619 struct subprocess *chp;
620 dbglog("Waiting for %d child processes...", n_children);
621 for (chp = children; chp != NULL; chp = chp->next)
622 dbglog(" script %s, pid %d", chp->prog, chp->pid);
624 if (reap_kids(1) < 0)
633 * setup_signals - initialize signal handling.
642 * Compute mask of all interesting signals and install signal handlers
643 * for each. Only one signal handler may be active at a time. Therefore,
644 * all other signals should be masked when any handler is executing.
647 sigaddset(&mask, SIGHUP);
648 sigaddset(&mask, SIGINT);
649 sigaddset(&mask, SIGTERM);
650 sigaddset(&mask, SIGCHLD);
651 sigaddset(&mask, SIGUSR2);
653 #define SIGNAL(s, handler) do { \
654 sa.sa_handler = handler; \
655 if (sigaction(s, &sa, NULL) < 0) \
656 fatal("Couldn't establish signal handler (%d): %m", s); \
661 SIGNAL(SIGHUP, hup); /* Hangup */
662 SIGNAL(SIGINT, term); /* Interrupt */
663 SIGNAL(SIGTERM, term); /* Terminate */
664 SIGNAL(SIGCHLD, chld);
666 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
667 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
670 * Install a handler for other signals which would otherwise
671 * cause pppd to exit without cleaning up.
673 SIGNAL(SIGABRT, bad_signal);
674 SIGNAL(SIGALRM, bad_signal);
675 SIGNAL(SIGFPE, bad_signal);
676 SIGNAL(SIGILL, bad_signal);
677 SIGNAL(SIGPIPE, bad_signal);
678 SIGNAL(SIGQUIT, bad_signal);
679 SIGNAL(SIGSEGV, bad_signal);
681 SIGNAL(SIGBUS, bad_signal);
684 SIGNAL(SIGEMT, bad_signal);
687 SIGNAL(SIGPOLL, bad_signal);
690 SIGNAL(SIGPROF, bad_signal);
693 SIGNAL(SIGSYS, bad_signal);
696 SIGNAL(SIGTRAP, bad_signal);
699 SIGNAL(SIGVTALRM, bad_signal);
702 SIGNAL(SIGXCPU, bad_signal);
705 SIGNAL(SIGXFSZ, bad_signal);
709 * Apparently we can get a SIGPIPE when we call syslog, if
710 * syslogd has died and been restarted. Ignoring it seems
713 signal(SIGPIPE, SIG_IGN);
717 * set_ifunit - do things we need to do once we know which ppp
724 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
725 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
726 script_setenv("IFNAME", ifname, iskey);
728 create_pidfile(); /* write pid to file */
729 create_linkpidfile();
734 * detach - detach us from the controlling terminal.
744 if ((pid = fork()) < 0) {
745 error("Couldn't detach (fork failed: %m)");
746 die(1); /* or just return? */
750 notify(pidchange, pid);
751 exit(0); /* parent dies */
759 if (!log_to_file && !log_to_specific_fd)
761 /* update pid files if they have been written already */
765 create_linkpidfile();
766 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
767 script_setenv("PPPD_PID", numbuf, 1);
771 * reopen_log - (re)open our connection to syslog.
777 openlog("pppd", LOG_PID);
779 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
780 setlogmask(LOG_UPTO(LOG_INFO));
785 * Create a file containing our process ID.
792 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
793 _PATH_VARRUN, ifname);
794 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
795 fprintf(pidfile, "%d\n", getpid());
796 (void) fclose(pidfile);
798 error("Failed to create pid file %s: %m", pidfilename);
808 if (linkname[0] == 0)
810 script_setenv("LINKNAME", linkname, 1);
811 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
812 _PATH_VARRUN, linkname);
813 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
814 fprintf(pidfile, "%d\n", getpid());
816 fprintf(pidfile, "%s\n", ifname);
817 (void) fclose(pidfile);
819 error("Failed to create pid file %s: %m", linkpidfile);
825 * holdoff_end - called via a timeout when the holdoff period ends.
831 new_phase(PHASE_DORMANT);
834 /* List of protocol names, to make our messages a little more informative. */
835 struct protocol_list {
838 } protocol_list[] = {
840 { 0x23, "OSI Network Layer" },
841 { 0x25, "Xerox NS IDP" },
842 { 0x27, "DECnet Phase IV" },
843 { 0x29, "Appletalk" },
844 { 0x2b, "Novell IPX" },
845 { 0x2d, "VJ compressed TCP/IP" },
846 { 0x2f, "VJ uncompressed TCP/IP" },
847 { 0x31, "Bridging PDU" },
848 { 0x33, "Stream Protocol ST-II" },
849 { 0x35, "Banyan Vines" },
850 { 0x39, "AppleTalk EDDP" },
851 { 0x3b, "AppleTalk SmartBuffered" },
852 { 0x3d, "Multi-Link" },
853 { 0x3f, "NETBIOS Framing" },
854 { 0x41, "Cisco Systems" },
855 { 0x43, "Ascom Timeplex" },
856 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
857 { 0x47, "DCA Remote Lan" },
858 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
859 { 0x4b, "SNA over 802.2" },
861 { 0x4f, "IP6 Header Compression" },
862 { 0x6f, "Stampede Bridging" },
863 { 0xfb, "single-link compression" },
864 { 0xfd, "1st choice compression" },
865 { 0x0201, "802.1d Hello Packets" },
866 { 0x0203, "IBM Source Routing BPDU" },
867 { 0x0205, "DEC LANBridge100 Spanning Tree" },
868 { 0x0231, "Luxcom" },
869 { 0x0233, "Sigma Network Systems" },
870 { 0x8021, "Internet Protocol Control Protocol" },
871 { 0x8023, "OSI Network Layer Control Protocol" },
872 { 0x8025, "Xerox NS IDP Control Protocol" },
873 { 0x8027, "DECnet Phase IV Control Protocol" },
874 { 0x8029, "Appletalk Control Protocol" },
875 { 0x802b, "Novell IPX Control Protocol" },
876 { 0x8031, "Bridging NCP" },
877 { 0x8033, "Stream Protocol Control Protocol" },
878 { 0x8035, "Banyan Vines Control Protocol" },
879 { 0x803d, "Multi-Link Control Protocol" },
880 { 0x803f, "NETBIOS Framing Control Protocol" },
881 { 0x8041, "Cisco Systems Control Protocol" },
882 { 0x8043, "Ascom Timeplex" },
883 { 0x8045, "Fujitsu LBLB Control Protocol" },
884 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
885 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
886 { 0x804b, "SNA over 802.2 Control Protocol" },
887 { 0x804d, "SNA Control Protocol" },
888 { 0x804f, "IP6 Header Compression Control Protocol" },
889 { 0x006f, "Stampede Bridging Control Protocol" },
890 { 0x80fb, "Single Link Compression Control Protocol" },
891 { 0x80fd, "Compression Control Protocol" },
892 { 0xc021, "Link Control Protocol" },
893 { 0xc023, "Password Authentication Protocol" },
894 { 0xc025, "Link Quality Report" },
895 { 0xc027, "Shiva Password Authentication Protocol" },
896 { 0xc029, "CallBack Control Protocol (CBCP)" },
897 { 0xc081, "Container Control Protocol" },
898 { 0xc223, "Challenge Handshake Authentication Protocol" },
899 { 0xc281, "Proprietary Authentication Protocol" },
904 * protocol_name - find a name for a PPP protocol.
910 struct protocol_list *lp;
912 for (lp = protocol_list; lp->proto != 0; ++lp)
913 if (proto == lp->proto)
919 * get_input - called when incoming data is available.
927 struct protent *protp;
929 p = inpacket_buf; /* point to beginning of packet buffer */
931 len = read_packet(inpacket_buf);
936 notice("Modem hangup");
938 status = EXIT_HANGUP;
939 lcp_lowerdown(0); /* serial link is no longer available */
944 if (debug /*&& (debugflags & DBG_INPACKET)*/)
945 dbglog("rcvd %P", p, len);
947 if (len < PPP_HDRLEN) {
948 MAINDEBUG(("io(): Received short packet."));
952 p += 2; /* Skip address and control */
953 GETSHORT(protocol, p);
957 * Toss all non-LCP packets unless LCP is OPEN.
959 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
960 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
965 * Until we get past the authentication phase, toss all packets
966 * except LCP, LQR and authentication packets.
968 if (phase <= PHASE_AUTHENTICATE
969 && !(protocol == PPP_LCP || protocol == PPP_LQR
970 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
971 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
977 * Upcall the proper protocol input routine.
979 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
980 if (protp->protocol == protocol && protp->enabled_flag) {
981 (*protp->input)(0, p, len);
984 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
985 && protp->datainput != NULL) {
986 (*protp->datainput)(0, p, len);
992 const char *pname = protocol_name(protocol);
994 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
996 warn("Unsupported protocol 0x%x received", protocol);
998 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1002 * new_phase - signal the start of a new phase of pppd's operation.
1010 (*new_phase_hook)(p);
1011 notify(phasechange, p);
1015 * die - clean up state and exit with the specified status.
1022 notify(exitnotify, status);
1023 syslog(LOG_INFO, "Exit.");
1028 * cleanup - restore anything which needs to be restored before we exit
1037 disestablish_ppp(devfd);
1040 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1041 warn("unable to delete pid file %s: %m", pidfilename);
1043 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1044 warn("unable to delete pid file %s: %m", linkpidfile);
1052 * update_link_stats - get stats at link termination.
1055 update_link_stats(u)
1061 if (!get_ppp_stats(u, &link_stats)
1062 || gettimeofday(&now, NULL) < 0)
1064 link_connect_time = now.tv_sec - start_time.tv_sec;
1065 link_stats_valid = 1;
1067 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1068 script_setenv("CONNECT_TIME", numbuf, 0);
1069 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1070 script_setenv("BYTES_SENT", numbuf, 0);
1071 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1072 script_setenv("BYTES_RCVD", numbuf, 0);
1077 struct timeval c_time; /* time at which to call routine */
1078 void *c_arg; /* argument to routine */
1079 void (*c_func) __P((void *)); /* routine */
1080 struct callout *c_next;
1083 static struct callout *callout = NULL; /* Callout list */
1084 static struct timeval timenow; /* Current time */
1087 * timeout - Schedule a timeout.
1089 * Note that this timeout takes the number of seconds, NOT hz (as in
1093 timeout(func, arg, time)
1094 void (*func) __P((void *));
1098 struct callout *newp, *p, **pp;
1100 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1105 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1106 fatal("Out of memory in timeout()!");
1108 newp->c_func = func;
1109 gettimeofday(&timenow, NULL);
1110 newp->c_time.tv_sec = timenow.tv_sec + time;
1111 newp->c_time.tv_usec = timenow.tv_usec;
1114 * Find correct place and link it in.
1116 for (pp = &callout; (p = *pp); pp = &p->c_next)
1117 if (newp->c_time.tv_sec < p->c_time.tv_sec
1118 || (newp->c_time.tv_sec == p->c_time.tv_sec
1119 && newp->c_time.tv_usec < p->c_time.tv_usec))
1127 * untimeout - Unschedule a timeout.
1130 untimeout(func, arg)
1131 void (*func) __P((void *));
1134 struct callout **copp, *freep;
1136 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1139 * Find first matching timeout and remove it from the list.
1141 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1142 if (freep->c_func == func && freep->c_arg == arg) {
1143 *copp = freep->c_next;
1144 free((char *) freep);
1151 * calltimeout - Call any timeout routines which are now due.
1158 while (callout != NULL) {
1161 if (gettimeofday(&timenow, NULL) < 0)
1162 fatal("Failed to get time of day: %m");
1163 if (!(p->c_time.tv_sec < timenow.tv_sec
1164 || (p->c_time.tv_sec == timenow.tv_sec
1165 && p->c_time.tv_usec <= timenow.tv_usec)))
1166 break; /* no, it's not time yet */
1168 callout = p->c_next;
1169 (*p->c_func)(p->c_arg);
1177 * timeleft - return the length of time until the next timeout is due.
1179 static struct timeval *
1181 struct timeval *tvp;
1183 if (callout == NULL)
1186 gettimeofday(&timenow, NULL);
1187 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1188 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1189 if (tvp->tv_usec < 0) {
1190 tvp->tv_usec += 1000000;
1193 if (tvp->tv_sec < 0)
1194 tvp->tv_sec = tvp->tv_usec = 0;
1201 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1207 struct sigaction act, oldact;
1209 act.sa_handler = SIG_IGN;
1212 sigaction(sig, &act, &oldact);
1213 sigaction(sig, &oldact, NULL);
1218 * hup - Catch SIGHUP signal.
1220 * Indicates that the physical layer has been disconnected.
1221 * We don't rely on this indication; if the user has sent this
1222 * signal, we just take the link down.
1228 info("Hangup (SIGHUP)");
1230 if (status != EXIT_HANGUP)
1231 status = EXIT_USER_REQUEST;
1233 /* Send the signal to the [dis]connector process(es) also */
1235 notify(sigreceived, sig);
1237 siglongjmp(sigjmp, 1);
1242 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1244 * Indicates that we should initiate a graceful disconnect and exit.
1251 info("Terminating on signal %d.", sig);
1252 persist = 0; /* don't try to restart */
1254 status = EXIT_USER_REQUEST;
1256 /* Send the signal to the [dis]connector process(es) also */
1258 notify(sigreceived, sig);
1260 siglongjmp(sigjmp, 1);
1265 * chld - Catch SIGCHLD signal.
1266 * Sets a flag so we will call reap_kids in the mainline.
1274 siglongjmp(sigjmp, 1);
1279 * toggle_debug - Catch SIGUSR1 signal.
1281 * Toggle debug flag.
1290 setlogmask(LOG_UPTO(LOG_DEBUG));
1292 setlogmask(LOG_UPTO(LOG_WARNING));
1298 * open_ccp - Catch SIGUSR2 signal.
1300 * Try to (re)negotiate compression.
1309 siglongjmp(sigjmp, 1);
1314 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1320 static int crashed = 0;
1325 error("Fatal signal %d", sig);
1327 kill_my_pg(SIGTERM);
1328 notify(sigreceived, sig);
1334 * device_script - run a program to talk to the specified fds
1335 * (e.g. to run the connector or disconnector script).
1336 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1339 device_script(program, in, out, dont_wait)
1353 error("Failed to create child process: %m");
1359 record_child(pid, program, NULL, NULL);
1362 while (waitpid(pid, &status, 0) < 0) {
1365 fatal("error waiting for (dis)connection process: %m");
1369 return (status == 0 ? 0 : -1);
1372 /* here we are executing in the child */
1373 /* make sure fds 0, 1, 2 are occupied */
1374 while ((fd = dup(in)) >= 0) {
1381 /* dup in and out to fds > 2 */
1384 if (log_to_fd >= 0) {
1385 errfd = dup(log_to_fd);
1387 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1390 /* close fds 0 - 2 and any others we can think of */
1398 /* dup the in, out, err fds to 0, 1, 2 */
1409 if (getuid() != uid) {
1410 error("setuid failed");
1414 execl("/bin/sh", "sh", "-c", program, (char *)0);
1415 error("could not exec /bin/sh: %m");
1422 * run-program - execute a program with given arguments,
1423 * but don't wait for it.
1424 * If the program can't be executed, logs an error unless
1425 * must_exist is 0 and the program file doesn't exist.
1426 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1427 * or isn't an executable plain file, or the process ID of the child.
1428 * If done != NULL, (*done)(arg) will be called later (within
1429 * reap_kids) iff the return value is > 0.
1432 run_program(prog, args, must_exist, done, arg)
1436 void (*done) __P((void *));
1443 * First check if the file exists and is executable.
1444 * We don't use access() because that would use the
1445 * real user-id, which might not be root, and the script
1446 * might be accessible only to root.
1449 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1450 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1451 if (must_exist || errno != ENOENT)
1452 warn("Can't execute %s: %m", prog);
1458 error("Failed to create child process for %s: %m", prog);
1464 /* Leave the current location */
1465 (void) setsid(); /* No controlling tty. */
1466 (void) umask (S_IRWXG|S_IRWXO);
1467 (void) chdir ("/"); /* no current directory. */
1468 setuid(0); /* set real UID = root */
1471 /* Ensure that nothing of our device environment is inherited. */
1479 /* Don't pass handles to the PPP device, even by accident. */
1480 new_fd = open (_PATH_DEVNULL, O_RDWR);
1483 dup2 (new_fd, 0); /* stdin <- /dev/null */
1486 dup2 (0, 1); /* stdout -> /dev/null */
1487 dup2 (0, 2); /* stderr -> /dev/null */
1491 /* Force the priority back to zero if pppd is running higher. */
1492 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1493 warn("can't reset priority to 0: %m");
1496 /* SysV recommends a second fork at this point. */
1498 /* run the program */
1499 execve(prog, args, script_env);
1500 if (must_exist || errno != ENOENT) {
1501 /* have to reopen the log, there's nowhere else
1502 for the message to go. */
1504 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1511 dbglog("Script %s started (pid %d)", prog, pid);
1512 record_child(pid, prog, done, arg);
1519 * record_child - add a child process to the list for reap_kids
1523 record_child(pid, prog, done, arg)
1526 void (*done) __P((void *));
1529 struct subprocess *chp;
1533 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1535 warn("losing track of %s process", prog);
1541 chp->next = children;
1548 * reap_kids - get status from any dead child processes,
1549 * and log a message for abnormal terminations.
1556 struct subprocess *chp, **prevp;
1559 if (n_children == 0)
1561 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1563 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1564 if (chp->pid == pid) {
1570 if (WIFSIGNALED(status)) {
1571 warn("Child process %s (pid %d) terminated with signal %d",
1572 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1574 dbglog("Script %s finished (pid %d), status = 0x%x",
1575 (chp? chp->prog: "??"), pid, status);
1576 if (chp && chp->done)
1577 (*chp->done)(chp->arg);
1582 if (errno == ECHILD)
1585 error("Error waiting for child process: %m");
1591 * add_notifier - add a new function to be called when something happens.
1594 add_notifier(notif, func, arg)
1595 struct notifier **notif;
1599 struct notifier *np;
1601 np = malloc(sizeof(struct notifier));
1603 novm("notifier struct");
1611 * remove_notifier - remove a function from the list of things to
1612 * be called when something happens.
1615 remove_notifier(notif, func, arg)
1616 struct notifier **notif;
1620 struct notifier *np;
1622 for (; (np = *notif) != 0; notif = &np->next) {
1623 if (np->func == func && np->arg == arg) {
1632 * notify - call a set of functions registered with add_notify.
1636 struct notifier *notif;
1639 struct notifier *np;
1641 while ((np = notif) != 0) {
1643 (*np->func)(np->arg, val);
1648 * novm - log an error message saying we ran out of memory, and die.
1654 fatal("Virtual memory exhausted allocating %s\n", msg);
1658 * script_setenv - set an environment variable value to be used
1659 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1662 script_setenv(var, value, iskey)
1666 size_t varl = strlen(var);
1667 size_t vl = varl + strlen(value) + 2;
1669 char *p, *newstring;
1671 newstring = (char *) malloc(vl+1);
1674 *newstring++ = iskey;
1675 slprintf(newstring, vl, "%s=%s", var, value);
1677 /* check if this variable is already set */
1678 if (script_env != 0) {
1679 for (i = 0; (p = script_env[i]) != 0; ++i) {
1680 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1681 if (p[-1] && pppdb != NULL)
1684 script_env[i] = newstring;
1685 if (iskey && pppdb != NULL)
1686 add_db_key(newstring);
1692 /* no space allocated for script env. ptrs. yet */
1694 script_env = (char **) malloc(16 * sizeof(char *));
1695 if (script_env == 0)
1700 /* reallocate script_env with more space if needed */
1701 if (i + 1 >= s_env_nalloc) {
1703 char **newenv = (char **) realloc((void *)script_env,
1704 new_n * sizeof(char *));
1707 script_env = newenv;
1708 s_env_nalloc = new_n;
1711 script_env[i] = newstring;
1712 script_env[i+1] = 0;
1714 if (pppdb != NULL) {
1716 add_db_key(newstring);
1722 * script_unsetenv - remove a variable from the environment
1726 script_unsetenv(var)
1729 int vl = strlen(var);
1733 if (script_env == 0)
1735 for (i = 0; (p = script_env[i]) != 0; ++i) {
1736 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1737 if (p[-1] && pppdb != NULL)
1740 while ((script_env[i] = script_env[i+1]) != 0)
1750 * update_db_entry - update our entry in the database.
1759 if (script_env == NULL)
1762 for (i = 0; (p = script_env[i]) != 0; ++i)
1763 vlen += strlen(p) + 1;
1764 vbuf = malloc(vlen);
1766 novm("database entry");
1768 for (i = 0; (p = script_env[i]) != 0; ++i)
1769 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1772 key.dsize = strlen(db_key);
1775 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1776 error("tdb_store failed: %s", tdb_error(pppdb));
1781 * add_db_key - add a key that we can use to look up our database entry.
1789 key.dptr = (char *) str;
1790 key.dsize = strlen(str);
1792 dbuf.dsize = strlen(db_key);
1793 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1794 error("tdb_store key failed: %s", tdb_error(pppdb));
1798 * delete_db_key - delete a key for looking up our database entry.
1806 key.dptr = (char *) str;
1807 key.dsize = strlen(str);
1808 tdb_delete(pppdb, key);
1812 * cleanup_db - delete all the entries we put in the database.
1822 key.dsize = strlen(db_key);
1823 tdb_delete(pppdb, key);
1824 for (i = 0; (p = script_env[i]) != 0; ++i)