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 1.110 2002/01/14 14:25:10 dfs 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"
68 #endif /* IPX_CHANGE */
73 static const char rcsid[] = RCSID;
76 char ifname[32]; /* Interface name */
77 int ifunit; /* Interface unit number */
79 struct channel *the_channel;
81 char *progname; /* Name of this program */
82 char hostname[MAXNAMELEN]; /* Our hostname */
83 static char pidfilename[MAXPATHLEN]; /* name of pid file */
84 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
85 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
86 uid_t uid; /* Our real user-id */
87 struct notifier *pidchange = NULL;
88 struct notifier *phasechange = NULL;
89 struct notifier *exitnotify = NULL;
90 struct notifier *sigreceived = NULL;
92 int hungup; /* terminal has been hung up */
93 int privileged; /* we're running as real uid root */
94 int need_holdoff; /* need holdoff period before restarting */
95 int detached; /* have detached from terminal */
96 volatile int status; /* exit status for pppd */
97 int unsuccess; /* # unsuccessful connection attempts */
98 int do_callback; /* != 0 if we should do callback next */
99 int doing_callback; /* != 0 if we are doing callback */
102 TDB_CONTEXT *pppdb; /* database for storing status etc. */
107 int (*holdoff_hook) __P((void)) = NULL;
108 int (*new_phase_hook) __P((int)) = NULL;
110 static int conn_running; /* we have a [dis]connector running */
111 static int devfd; /* fd of underlying device */
112 static int fd_ppp = -1; /* fd for talking PPP */
113 static int fd_loop; /* fd for getting demand-dial packets */
115 int phase; /* where the link is at */
124 static sigjmp_buf sigjmp;
126 char **script_env; /* Env. variable values for scripts */
127 int s_env_nalloc; /* # words avail at script_env */
129 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
130 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
132 static int n_children; /* # child processes still running */
133 static int got_sigchld; /* set if we have received a SIGCHLD */
135 int privopen; /* don't lock, open device as root */
137 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
139 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
140 int ngroups; /* How many groups valid in groups */
142 static struct timeval start_time; /* Time when link was started. */
144 struct pppd_stats link_stats;
145 int link_connect_time;
146 int link_stats_valid;
149 * We maintain a list of child process pids and
150 * functions to call when they exit.
155 void (*done) __P((void *));
157 struct subprocess *next;
160 static struct subprocess *children;
162 /* Prototypes for procedures local to this file. */
164 static void setup_signals __P((void));
165 static void create_pidfile __P((void));
166 static void create_linkpidfile __P((void));
167 static void cleanup __P((void));
168 static void get_input __P((void));
169 static void calltimeout __P((void));
170 static struct timeval *timeleft __P((struct timeval *));
171 static void kill_my_pg __P((int));
172 static void hup __P((int));
173 static void term __P((int));
174 static void chld __P((int));
175 static void toggle_debug __P((int));
176 static void open_ccp __P((int));
177 static void bad_signal __P((int));
178 static void holdoff_end __P((void *));
179 static int reap_kids __P((int waitfor));
182 static void update_db_entry __P((void));
183 static void add_db_key __P((const char *));
184 static void delete_db_key __P((const char *));
185 static void cleanup_db __P((void));
188 static void handle_events __P((void));
189 static void print_link_stats __P((void));
191 extern char *ttyname __P((int));
192 extern char *getlogin __P((void));
193 int main __P((int, char *[]));
197 #define O_NONBLOCK O_NDELAY
201 #define setlogmask(x)
205 * PPP Data Link Layer "protocol" table.
206 * One entry per supported protocol.
207 * The last entry must be NULL.
209 struct protent *protocols[] = {
231 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
233 #if !defined(PPP_DRV_NAME)
234 #define PPP_DRV_NAME "ppp"
235 #endif /* !defined(PPP_DRV_NAME) */
245 struct protent *protp;
248 link_stats_valid = 0;
249 new_phase(PHASE_INITIALIZE);
252 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
253 * This way we can close 0, 1, 2 in detach() without clobbering
254 * a fd that we are using.
256 if ((i = open("/dev/null", O_RDWR)) >= 0) {
257 while (0 <= i && i <= 2)
265 /* Initialize syslog facilities */
268 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
269 option_error("Couldn't get hostname: %m");
272 hostname[MAXNAMELEN-1] = 0;
274 /* make sure we don't create world or group writable files. */
275 umask(umask(0777) | 022);
278 privileged = uid == 0;
279 slprintf(numbuf, sizeof(numbuf), "%d", uid);
280 script_setenv("ORIG_UID", numbuf, 0);
282 ngroups = getgroups(NGROUPS_MAX, groups);
285 * Initialize magic number generator now so that protocols may
286 * use magic numbers in initialization.
291 * Initialize each protocol.
293 for (i = 0; (protp = protocols[i]) != NULL; ++i)
297 * Initialize the default channel.
304 * Parse, in order, the system options file, the user's options file,
305 * and the command line arguments.
307 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
308 || !options_from_user()
309 || !parse_args(argc-1, argv+1))
310 exit(EXIT_OPTION_ERROR);
311 devnam_fixed = 1; /* can no longer change device name */
314 * Work out the device name, if it hasn't already been specified,
315 * and parse the tty's options file.
317 if (the_channel->process_extra_options)
318 (*the_channel->process_extra_options)();
321 setlogmask(LOG_UPTO(LOG_DEBUG));
324 * Check that we are running as root.
326 if (geteuid() != 0) {
327 option_error("must be root to run %s, since it is not setuid-root",
332 if (!ppp_available()) {
333 option_error("%s", no_ppp_msg);
334 exit(EXIT_NO_KERNEL_SUPPORT);
338 * Check that the options given are valid and consistent.
341 if (!sys_check_options())
342 exit(EXIT_OPTION_ERROR);
343 auth_check_options();
344 #ifdef HAVE_MULTILINK
347 for (i = 0; (protp = protocols[i]) != NULL; ++i)
348 if (protp->check_options != NULL)
349 (*protp->check_options)();
350 if (the_channel->check_options)
351 (*the_channel->check_options)();
354 if (dump_options || dryrun) {
355 init_pr_log(NULL, LOG_INFO);
356 print_options(pr_log, NULL);
363 * Initialize system-dependent stuff.
368 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
370 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
373 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
375 warn("Warning: disabling multilink");
382 * Detach ourselves from the terminal, if required,
383 * and identify who is running us.
385 if (!nodetach && !updetach)
390 if (pw != NULL && pw->pw_name != NULL)
395 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
396 script_setenv("PPPLOGNAME", p, 0);
399 script_setenv("DEVICE", devnam, 1);
400 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
401 script_setenv("PPPD_PID", numbuf, 1);
407 create_linkpidfile();
410 * If we're doing dial-on-demand, set up the interface now.
414 * Open the loopback channel and set it up to be the ppp interface.
417 tdb_writelock(pppdb);
419 fd_loop = open_ppp_loopback();
422 tdb_writeunlock(pppdb);
425 * Configure the interface and mark it up, etc.
438 doing_callback = do_callback;
441 if (demand && !doing_callback) {
443 * Don't do anything until we see some activity.
445 new_phase(PHASE_DORMANT);
450 if (kill_link && !persist)
452 if (get_loop_output())
456 if (kill_link && !persist)
460 * Now we want to bring up the link.
463 info("Starting link");
466 new_phase(PHASE_SERIALCONN);
468 devfd = the_channel->connect();
472 /* set up the serial device as a ppp interface */
474 tdb_writelock(pppdb);
476 fd_ppp = the_channel->establish_ppp(devfd);
479 tdb_writeunlock(pppdb);
481 status = EXIT_FATAL_ERROR;
485 if (!demand && ifunit >= 0)
488 tdb_writeunlock(pppdb);
492 * Start opening the connection and wait for
493 * incoming events (reply, timeout, etc.).
496 notice("Connect: %s <--> %s", ifname, ppp_devnam);
498 notice("Starting negotiation on %s", ppp_devnam);
499 gettimeofday(&start_time, NULL);
500 script_unsetenv("CONNECT_TIME");
501 script_unsetenv("BYTES_SENT");
502 script_unsetenv("BYTES_RCVD");
506 lcp_open(0); /* Start protocol */
507 status = EXIT_NEGOTIATION_FAILED;
508 new_phase(PHASE_ESTABLISH);
509 while (phase != PHASE_DEAD) {
513 lcp_close(0, "User request");
515 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
516 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
517 (*ccp_protent.open)(0);
525 * Delete pid file before disestablishing ppp. Otherwise it
526 * can happen that another pppd gets the same unit and then
527 * we delete its pid file.
530 if (pidfilename[0] != 0
531 && unlink(pidfilename) < 0 && errno != ENOENT)
532 warn("unable to delete pid file %s: %m", pidfilename);
537 * If we may want to bring the link up again, transfer
538 * the ppp unit back to the loopback. Set the
539 * real serial device back to its normal mode of operation.
543 the_channel->disestablish_ppp(devfd);
548 script_unsetenv("IFNAME");
551 * Run disconnector script, if requested.
552 * XXX we may not be able to do this if the line has hung up!
555 new_phase(PHASE_DISCONNECT);
556 the_channel->disconnect();
559 if (the_channel->cleanup)
560 (*the_channel->cleanup)();
563 if (pidfilename[0] != 0
564 && unlink(pidfilename) < 0 && errno != ENOENT)
565 warn("unable to delete pid file %s: %m", pidfilename);
569 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
574 t = need_holdoff? holdoff: 0;
576 t = (*holdoff_hook)();
578 new_phase(PHASE_HOLDOFF);
579 TIMEOUT(holdoff_end, NULL, t);
583 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
584 } while (phase == PHASE_HOLDOFF);
590 /* Wait for scripts to finish */
591 /* XXX should have a timeout here */
592 while (n_children > 0) {
594 struct subprocess *chp;
595 dbglog("Waiting for %d child processes...", n_children);
596 for (chp = children; chp != NULL; chp = chp->next)
597 dbglog(" script %s, pid %d", chp->prog, chp->pid);
599 if (reap_kids(1) < 0)
608 * handle_events - wait for something to happen and respond to it.
616 kill_link = open_ccp_flag = 0;
617 if (sigsetjmp(sigjmp, 1) == 0) {
618 sigprocmask(SIG_BLOCK, &mask, NULL);
619 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
620 sigprocmask(SIG_UNBLOCK, &mask, NULL);
623 sigprocmask(SIG_UNBLOCK, &mask, NULL);
624 wait_input(timeleft(&timo));
632 if (status != EXIT_HANGUP)
633 status = EXIT_USER_REQUEST;
638 status = EXIT_USER_REQUEST;
642 reap_kids(0); /* Don't leave dead kids lying around */
652 * setup_signals - initialize signal handling.
661 * Compute mask of all interesting signals and install signal handlers
662 * for each. Only one signal handler may be active at a time. Therefore,
663 * all other signals should be masked when any handler is executing.
666 sigaddset(&mask, SIGHUP);
667 sigaddset(&mask, SIGINT);
668 sigaddset(&mask, SIGTERM);
669 sigaddset(&mask, SIGCHLD);
670 sigaddset(&mask, SIGUSR2);
672 #define SIGNAL(s, handler) do { \
673 sa.sa_handler = handler; \
674 if (sigaction(s, &sa, NULL) < 0) \
675 fatal("Couldn't establish signal handler (%d): %m", s); \
680 SIGNAL(SIGHUP, hup); /* Hangup */
681 SIGNAL(SIGINT, term); /* Interrupt */
682 SIGNAL(SIGTERM, term); /* Terminate */
683 SIGNAL(SIGCHLD, chld);
685 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
686 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
689 * Install a handler for other signals which would otherwise
690 * cause pppd to exit without cleaning up.
692 SIGNAL(SIGABRT, bad_signal);
693 SIGNAL(SIGALRM, bad_signal);
694 SIGNAL(SIGFPE, bad_signal);
695 SIGNAL(SIGILL, bad_signal);
696 SIGNAL(SIGPIPE, bad_signal);
697 SIGNAL(SIGQUIT, bad_signal);
698 SIGNAL(SIGSEGV, bad_signal);
700 SIGNAL(SIGBUS, bad_signal);
703 SIGNAL(SIGEMT, bad_signal);
706 SIGNAL(SIGPOLL, bad_signal);
709 SIGNAL(SIGPROF, bad_signal);
712 SIGNAL(SIGSYS, bad_signal);
715 SIGNAL(SIGTRAP, bad_signal);
718 SIGNAL(SIGVTALRM, bad_signal);
721 SIGNAL(SIGXCPU, bad_signal);
724 SIGNAL(SIGXFSZ, bad_signal);
728 * Apparently we can get a SIGPIPE when we call syslog, if
729 * syslogd has died and been restarted. Ignoring it seems
732 signal(SIGPIPE, SIG_IGN);
736 * set_ifunit - do things we need to do once we know which ppp
743 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
744 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
745 script_setenv("IFNAME", ifname, iskey);
747 create_pidfile(); /* write pid to file */
748 create_linkpidfile();
753 * detach - detach us from the controlling terminal.
763 if ((pid = fork()) < 0) {
764 error("Couldn't detach (fork failed: %m)");
765 die(1); /* or just return? */
769 notify(pidchange, pid);
770 exit(0); /* parent dies */
780 /* update pid files if they have been written already */
784 create_linkpidfile();
785 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
786 script_setenv("PPPD_PID", numbuf, 1);
790 * reopen_log - (re)open our connection to syslog.
796 openlog("pppd", LOG_PID);
798 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
799 setlogmask(LOG_UPTO(LOG_INFO));
804 * Create a file containing our process ID.
811 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
812 _PATH_VARRUN, ifname);
813 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
814 fprintf(pidfile, "%d\n", getpid());
815 (void) fclose(pidfile);
817 error("Failed to create pid file %s: %m", pidfilename);
827 if (linkname[0] == 0)
829 script_setenv("LINKNAME", linkname, 1);
830 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
831 _PATH_VARRUN, linkname);
832 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
833 fprintf(pidfile, "%d\n", getpid());
835 fprintf(pidfile, "%s\n", ifname);
836 (void) fclose(pidfile);
838 error("Failed to create pid file %s: %m", linkpidfile);
844 * holdoff_end - called via a timeout when the holdoff period ends.
850 new_phase(PHASE_DORMANT);
853 /* List of protocol names, to make our messages a little more informative. */
854 struct protocol_list {
857 } protocol_list[] = {
859 { 0x23, "OSI Network Layer" },
860 { 0x25, "Xerox NS IDP" },
861 { 0x27, "DECnet Phase IV" },
862 { 0x29, "Appletalk" },
863 { 0x2b, "Novell IPX" },
864 { 0x2d, "VJ compressed TCP/IP" },
865 { 0x2f, "VJ uncompressed TCP/IP" },
866 { 0x31, "Bridging PDU" },
867 { 0x33, "Stream Protocol ST-II" },
868 { 0x35, "Banyan Vines" },
869 { 0x39, "AppleTalk EDDP" },
870 { 0x3b, "AppleTalk SmartBuffered" },
871 { 0x3d, "Multi-Link" },
872 { 0x3f, "NETBIOS Framing" },
873 { 0x41, "Cisco Systems" },
874 { 0x43, "Ascom Timeplex" },
875 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
876 { 0x47, "DCA Remote Lan" },
877 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
878 { 0x4b, "SNA over 802.2" },
880 { 0x4f, "IP6 Header Compression" },
881 { 0x6f, "Stampede Bridging" },
882 { 0xfb, "single-link compression" },
883 { 0xfd, "1st choice compression" },
884 { 0x0201, "802.1d Hello Packets" },
885 { 0x0203, "IBM Source Routing BPDU" },
886 { 0x0205, "DEC LANBridge100 Spanning Tree" },
887 { 0x0231, "Luxcom" },
888 { 0x0233, "Sigma Network Systems" },
889 { 0x8021, "Internet Protocol Control Protocol" },
890 { 0x8023, "OSI Network Layer Control Protocol" },
891 { 0x8025, "Xerox NS IDP Control Protocol" },
892 { 0x8027, "DECnet Phase IV Control Protocol" },
893 { 0x8029, "Appletalk Control Protocol" },
894 { 0x802b, "Novell IPX Control Protocol" },
895 { 0x8031, "Bridging NCP" },
896 { 0x8033, "Stream Protocol Control Protocol" },
897 { 0x8035, "Banyan Vines Control Protocol" },
898 { 0x803d, "Multi-Link Control Protocol" },
899 { 0x803f, "NETBIOS Framing Control Protocol" },
900 { 0x8041, "Cisco Systems Control Protocol" },
901 { 0x8043, "Ascom Timeplex" },
902 { 0x8045, "Fujitsu LBLB Control Protocol" },
903 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
904 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
905 { 0x804b, "SNA over 802.2 Control Protocol" },
906 { 0x804d, "SNA Control Protocol" },
907 { 0x804f, "IP6 Header Compression Control Protocol" },
908 { 0x006f, "Stampede Bridging Control Protocol" },
909 { 0x80fb, "Single Link Compression Control Protocol" },
910 { 0x80fd, "Compression Control Protocol" },
911 { 0xc021, "Link Control Protocol" },
912 { 0xc023, "Password Authentication Protocol" },
913 { 0xc025, "Link Quality Report" },
914 { 0xc027, "Shiva Password Authentication Protocol" },
915 { 0xc029, "CallBack Control Protocol (CBCP)" },
916 { 0xc081, "Container Control Protocol" },
917 { 0xc223, "Challenge Handshake Authentication Protocol" },
918 { 0xc281, "Proprietary Authentication Protocol" },
923 * protocol_name - find a name for a PPP protocol.
929 struct protocol_list *lp;
931 for (lp = protocol_list; lp->proto != 0; ++lp)
932 if (proto == lp->proto)
938 * get_input - called when incoming data is available.
946 struct protent *protp;
948 p = inpacket_buf; /* point to beginning of packet buffer */
950 len = read_packet(inpacket_buf);
955 notice("Modem hangup");
957 status = EXIT_HANGUP;
958 lcp_lowerdown(0); /* serial link is no longer available */
963 if (len < PPP_HDRLEN) {
964 dbglog("received short packet:%.*B", len, p);
968 dump_packet("rcvd", p, len);
970 p += 2; /* Skip address and control */
971 GETSHORT(protocol, p);
975 * Toss all non-LCP packets unless LCP is OPEN.
977 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
978 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
983 * Until we get past the authentication phase, toss all packets
984 * except LCP, LQR and authentication packets.
986 if (phase <= PHASE_AUTHENTICATE
987 && !(protocol == PPP_LCP || protocol == PPP_LQR
988 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
989 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
995 * Upcall the proper protocol input routine.
997 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
998 if (protp->protocol == protocol && protp->enabled_flag) {
999 (*protp->input)(0, p, len);
1002 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1003 && protp->datainput != NULL) {
1004 (*protp->datainput)(0, p, len);
1010 const char *pname = protocol_name(protocol);
1012 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1014 warn("Unsupported protocol 0x%x received", protocol);
1016 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1020 * new_phase - signal the start of a new phase of pppd's operation.
1028 (*new_phase_hook)(p);
1029 notify(phasechange, p);
1033 * die - clean up state and exit with the specified status.
1041 notify(exitnotify, status);
1042 syslog(LOG_INFO, "Exit.");
1047 * cleanup - restore anything which needs to be restored before we exit
1056 the_channel->disestablish_ppp(devfd);
1057 if (the_channel->cleanup)
1058 (*the_channel->cleanup)();
1060 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1061 warn("unable to delete pid file %s: %m", pidfilename);
1063 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1064 warn("unable to delete pid file %s: %m", linkpidfile);
1078 * Print connect time and statistics.
1080 if (link_stats_valid) {
1081 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1082 info("Connect time %d.%d minutes.", t/10, t%10);
1083 info("Sent %u bytes, received %u bytes.",
1084 link_stats.bytes_out, link_stats.bytes_in);
1089 * update_link_stats - get stats at link termination.
1092 update_link_stats(u)
1098 if (!get_ppp_stats(u, &link_stats)
1099 || gettimeofday(&now, NULL) < 0)
1101 link_connect_time = now.tv_sec - start_time.tv_sec;
1102 link_stats_valid = 1;
1104 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1105 script_setenv("CONNECT_TIME", numbuf, 0);
1106 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1107 script_setenv("BYTES_SENT", numbuf, 0);
1108 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1109 script_setenv("BYTES_RCVD", numbuf, 0);
1114 struct timeval c_time; /* time at which to call routine */
1115 void *c_arg; /* argument to routine */
1116 void (*c_func) __P((void *)); /* routine */
1117 struct callout *c_next;
1120 static struct callout *callout = NULL; /* Callout list */
1121 static struct timeval timenow; /* Current time */
1124 * timeout - Schedule a timeout.
1127 timeout(func, arg, secs, usecs)
1128 void (*func) __P((void *));
1132 struct callout *newp, *p, **pp;
1134 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1140 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1141 fatal("Out of memory in timeout()!");
1143 newp->c_func = func;
1144 gettimeofday(&timenow, NULL);
1145 newp->c_time.tv_sec = timenow.tv_sec + secs;
1146 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1147 if (newp->c_time.tv_usec >= 1000000) {
1148 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1149 newp->c_time.tv_usec %= 1000000;
1153 * Find correct place and link it in.
1155 for (pp = &callout; (p = *pp); pp = &p->c_next)
1156 if (newp->c_time.tv_sec < p->c_time.tv_sec
1157 || (newp->c_time.tv_sec == p->c_time.tv_sec
1158 && newp->c_time.tv_usec < p->c_time.tv_usec))
1166 * untimeout - Unschedule a timeout.
1169 untimeout(func, arg)
1170 void (*func) __P((void *));
1173 struct callout **copp, *freep;
1175 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1178 * Find first matching timeout and remove it from the list.
1180 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1181 if (freep->c_func == func && freep->c_arg == arg) {
1182 *copp = freep->c_next;
1183 free((char *) freep);
1190 * calltimeout - Call any timeout routines which are now due.
1197 while (callout != NULL) {
1200 if (gettimeofday(&timenow, NULL) < 0)
1201 fatal("Failed to get time of day: %m");
1202 if (!(p->c_time.tv_sec < timenow.tv_sec
1203 || (p->c_time.tv_sec == timenow.tv_sec
1204 && p->c_time.tv_usec <= timenow.tv_usec)))
1205 break; /* no, it's not time yet */
1207 callout = p->c_next;
1208 (*p->c_func)(p->c_arg);
1216 * timeleft - return the length of time until the next timeout is due.
1218 static struct timeval *
1220 struct timeval *tvp;
1222 if (callout == NULL)
1225 gettimeofday(&timenow, NULL);
1226 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1227 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1228 if (tvp->tv_usec < 0) {
1229 tvp->tv_usec += 1000000;
1232 if (tvp->tv_sec < 0)
1233 tvp->tv_sec = tvp->tv_usec = 0;
1240 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1246 struct sigaction act, oldact;
1248 act.sa_handler = SIG_IGN;
1251 sigaction(sig, &act, &oldact);
1252 sigaction(sig, &oldact, NULL);
1257 * hup - Catch SIGHUP signal.
1259 * Indicates that the physical layer has been disconnected.
1260 * We don't rely on this indication; if the user has sent this
1261 * signal, we just take the link down.
1267 info("Hangup (SIGHUP)");
1270 /* Send the signal to the [dis]connector process(es) also */
1272 notify(sigreceived, sig);
1274 siglongjmp(sigjmp, 1);
1279 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1281 * Indicates that we should initiate a graceful disconnect and exit.
1288 info("Terminating on signal %d.", sig);
1291 /* Send the signal to the [dis]connector process(es) also */
1293 notify(sigreceived, sig);
1295 siglongjmp(sigjmp, 1);
1300 * chld - Catch SIGCHLD signal.
1301 * Sets a flag so we will call reap_kids in the mainline.
1309 siglongjmp(sigjmp, 1);
1314 * toggle_debug - Catch SIGUSR1 signal.
1316 * Toggle debug flag.
1325 setlogmask(LOG_UPTO(LOG_DEBUG));
1327 setlogmask(LOG_UPTO(LOG_WARNING));
1333 * open_ccp - Catch SIGUSR2 signal.
1335 * Try to (re)negotiate compression.
1344 siglongjmp(sigjmp, 1);
1349 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1355 static int crashed = 0;
1360 error("Fatal signal %d", sig);
1362 kill_my_pg(SIGTERM);
1363 notify(sigreceived, sig);
1369 * device_script - run a program to talk to the specified fds
1370 * (e.g. to run the connector or disconnector script).
1371 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1374 device_script(program, in, out, dont_wait)
1388 error("Failed to create child process: %m");
1394 record_child(pid, program, NULL, NULL);
1397 while (waitpid(pid, &status, 0) < 0) {
1400 fatal("error waiting for (dis)connection process: %m");
1404 return (status == 0 ? 0 : -1);
1407 /* here we are executing in the child */
1408 /* make sure fds 0, 1, 2 are occupied */
1409 while ((fd = dup(in)) >= 0) {
1416 /* dup in and out to fds > 2 */
1419 if (log_to_fd >= 0) {
1420 errfd = dup(log_to_fd);
1422 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1425 /* close fds 0 - 2 and any others we can think of */
1430 if (the_channel->close)
1431 (*the_channel->close)();
1434 /* dup the in, out, err fds to 0, 1, 2 */
1445 if (getuid() != uid) {
1446 error("setuid failed");
1450 execl("/bin/sh", "sh", "-c", program, (char *)0);
1451 error("could not exec /bin/sh: %m");
1458 * run-program - execute a program with given arguments,
1459 * but don't wait for it.
1460 * If the program can't be executed, logs an error unless
1461 * must_exist is 0 and the program file doesn't exist.
1462 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1463 * or isn't an executable plain file, or the process ID of the child.
1464 * If done != NULL, (*done)(arg) will be called later (within
1465 * reap_kids) iff the return value is > 0.
1468 run_program(prog, args, must_exist, done, arg)
1472 void (*done) __P((void *));
1479 * First check if the file exists and is executable.
1480 * We don't use access() because that would use the
1481 * real user-id, which might not be root, and the script
1482 * might be accessible only to root.
1485 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1486 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1487 if (must_exist || errno != ENOENT)
1488 warn("Can't execute %s: %m", prog);
1494 error("Failed to create child process for %s: %m", prog);
1500 /* Leave the current location */
1501 (void) setsid(); /* No controlling tty. */
1502 (void) umask (S_IRWXG|S_IRWXO);
1503 (void) chdir ("/"); /* no current directory. */
1504 setuid(0); /* set real UID = root */
1507 /* Ensure that nothing of our device environment is inherited. */
1513 if (the_channel->close)
1514 (*the_channel->close)();
1516 /* Don't pass handles to the PPP device, even by accident. */
1517 new_fd = open (_PATH_DEVNULL, O_RDWR);
1520 dup2 (new_fd, 0); /* stdin <- /dev/null */
1523 dup2 (0, 1); /* stdout -> /dev/null */
1524 dup2 (0, 2); /* stderr -> /dev/null */
1528 /* Force the priority back to zero if pppd is running higher. */
1529 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1530 warn("can't reset priority to 0: %m");
1533 /* SysV recommends a second fork at this point. */
1535 /* run the program */
1536 execve(prog, args, script_env);
1537 if (must_exist || errno != ENOENT) {
1538 /* have to reopen the log, there's nowhere else
1539 for the message to go. */
1541 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1548 dbglog("Script %s started (pid %d)", prog, pid);
1549 record_child(pid, prog, done, arg);
1556 * record_child - add a child process to the list for reap_kids
1560 record_child(pid, prog, done, arg)
1563 void (*done) __P((void *));
1566 struct subprocess *chp;
1570 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1572 warn("losing track of %s process", prog);
1578 chp->next = children;
1585 * reap_kids - get status from any dead child processes,
1586 * and log a message for abnormal terminations.
1593 struct subprocess *chp, **prevp;
1595 if (n_children == 0)
1597 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1599 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1600 if (chp->pid == pid) {
1606 if (WIFSIGNALED(status)) {
1607 warn("Child process %s (pid %d) terminated with signal %d",
1608 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1610 dbglog("Script %s finished (pid %d), status = 0x%x",
1611 (chp? chp->prog: "??"), pid,
1612 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1613 if (chp && chp->done)
1614 (*chp->done)(chp->arg);
1619 if (errno == ECHILD)
1622 error("Error waiting for child process: %m");
1628 * add_notifier - add a new function to be called when something happens.
1631 add_notifier(notif, func, arg)
1632 struct notifier **notif;
1636 struct notifier *np;
1638 np = malloc(sizeof(struct notifier));
1640 novm("notifier struct");
1648 * remove_notifier - remove a function from the list of things to
1649 * be called when something happens.
1652 remove_notifier(notif, func, arg)
1653 struct notifier **notif;
1657 struct notifier *np;
1659 for (; (np = *notif) != 0; notif = &np->next) {
1660 if (np->func == func && np->arg == arg) {
1669 * notify - call a set of functions registered with add_notify.
1673 struct notifier *notif;
1676 struct notifier *np;
1678 while ((np = notif) != 0) {
1680 (*np->func)(np->arg, val);
1685 * novm - log an error message saying we ran out of memory, and die.
1691 fatal("Virtual memory exhausted allocating %s\n", msg);
1695 * script_setenv - set an environment variable value to be used
1696 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1699 script_setenv(var, value, iskey)
1703 size_t varl = strlen(var);
1704 size_t vl = varl + strlen(value) + 2;
1706 char *p, *newstring;
1708 newstring = (char *) malloc(vl+1);
1711 *newstring++ = iskey;
1712 slprintf(newstring, vl, "%s=%s", var, value);
1714 /* check if this variable is already set */
1715 if (script_env != 0) {
1716 for (i = 0; (p = script_env[i]) != 0; ++i) {
1717 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1719 if (p[-1] && pppdb != NULL)
1723 script_env[i] = newstring;
1725 if (iskey && pppdb != NULL)
1726 add_db_key(newstring);
1733 /* no space allocated for script env. ptrs. yet */
1735 script_env = (char **) malloc(16 * sizeof(char *));
1736 if (script_env == 0)
1741 /* reallocate script_env with more space if needed */
1742 if (i + 1 >= s_env_nalloc) {
1744 char **newenv = (char **) realloc((void *)script_env,
1745 new_n * sizeof(char *));
1748 script_env = newenv;
1749 s_env_nalloc = new_n;
1752 script_env[i] = newstring;
1753 script_env[i+1] = 0;
1756 if (pppdb != NULL) {
1758 add_db_key(newstring);
1765 * script_unsetenv - remove a variable from the environment
1769 script_unsetenv(var)
1772 int vl = strlen(var);
1776 if (script_env == 0)
1778 for (i = 0; (p = script_env[i]) != 0; ++i) {
1779 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1781 if (p[-1] && pppdb != NULL)
1785 while ((script_env[i] = script_env[i+1]) != 0)
1798 * update_db_entry - update our entry in the database.
1807 if (script_env == NULL)
1810 for (i = 0; (p = script_env[i]) != 0; ++i)
1811 vlen += strlen(p) + 1;
1812 vbuf = malloc(vlen);
1814 novm("database entry");
1816 for (i = 0; (p = script_env[i]) != 0; ++i)
1817 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1820 key.dsize = strlen(db_key);
1823 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1824 error("tdb_store failed: %s", tdb_error(pppdb));
1832 * add_db_key - add a key that we can use to look up our database entry.
1840 key.dptr = (char *) str;
1841 key.dsize = strlen(str);
1843 dbuf.dsize = strlen(db_key);
1844 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1845 error("tdb_store key failed: %s", tdb_error(pppdb));
1849 * delete_db_key - delete a key for looking up our database entry.
1857 key.dptr = (char *) str;
1858 key.dsize = strlen(str);
1859 tdb_delete(pppdb, key);
1863 * cleanup_db - delete all the entries we put in the database.
1873 key.dsize = strlen(db_key);
1874 tdb_delete(pppdb, key);
1875 for (i = 0; (p = script_env[i]) != 0; ++i)
1879 #endif /* USE_TDB */