2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name "Carnegie Mellon University" must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission. For permission or any legal
21 * details, please contact
22 * Office of Technology Transfer
23 * Carnegie Mellon University
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
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31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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43 #define RCSID "$Id: main.c,v 1.122 2003/02/24 12:46:37 fcusack Exp $"
58 #include <sys/param.h>
59 #include <sys/types.h>
62 #include <sys/resource.h>
64 #include <sys/socket.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
81 #include "pathnames.h"
93 #endif /* IPX_CHANGE */
98 static const char rcsid[] = RCSID;
101 char ifname[32]; /* Interface name */
102 int ifunit; /* Interface unit number */
104 struct channel *the_channel;
106 char *progname; /* Name of this program */
107 char hostname[MAXNAMELEN]; /* Our hostname */
108 static char pidfilename[MAXPATHLEN]; /* name of pid file */
109 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
110 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
111 uid_t uid; /* Our real user-id */
112 struct notifier *pidchange = NULL;
113 struct notifier *phasechange = NULL;
114 struct notifier *exitnotify = NULL;
115 struct notifier *sigreceived = NULL;
117 int hungup; /* terminal has been hung up */
118 int privileged; /* we're running as real uid root */
119 int need_holdoff; /* need holdoff period before restarting */
120 int detached; /* have detached from terminal */
121 volatile int status; /* exit status for pppd */
122 int unsuccess; /* # unsuccessful connection attempts */
123 int do_callback; /* != 0 if we should do callback next */
124 int doing_callback; /* != 0 if we are doing callback */
125 int ppp_session_number; /* Session number, for channels with such a
126 concept (eg PPPoE) */
128 TDB_CONTEXT *pppdb; /* database for storing status etc. */
133 int (*holdoff_hook) __P((void)) = NULL;
134 int (*new_phase_hook) __P((int)) = NULL;
135 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
136 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
138 static int conn_running; /* we have a [dis]connector running */
139 static int devfd; /* fd of underlying device */
140 static int fd_ppp = -1; /* fd for talking PPP */
141 static int fd_loop; /* fd for getting demand-dial packets */
143 int phase; /* where the link is at */
152 static sigjmp_buf sigjmp;
154 char **script_env; /* Env. variable values for scripts */
155 int s_env_nalloc; /* # words avail at script_env */
157 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
158 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
160 static int n_children; /* # child processes still running */
161 static int got_sigchld; /* set if we have received a SIGCHLD */
163 int privopen; /* don't lock, open device as root */
165 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
167 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
168 int ngroups; /* How many groups valid in groups */
170 static struct timeval start_time; /* Time when link was started. */
172 struct pppd_stats link_stats;
173 unsigned link_connect_time;
174 int link_stats_valid;
177 * We maintain a list of child process pids and
178 * functions to call when they exit.
183 void (*done) __P((void *));
185 struct subprocess *next;
188 static struct subprocess *children;
190 /* Prototypes for procedures local to this file. */
192 static void setup_signals __P((void));
193 static void create_pidfile __P((void));
194 static void create_linkpidfile __P((void));
195 static void cleanup __P((void));
196 static void get_input __P((void));
197 static void calltimeout __P((void));
198 static struct timeval *timeleft __P((struct timeval *));
199 static void kill_my_pg __P((int));
200 static void hup __P((int));
201 static void term __P((int));
202 static void chld __P((int));
203 static void toggle_debug __P((int));
204 static void open_ccp __P((int));
205 static void bad_signal __P((int));
206 static void holdoff_end __P((void *));
207 static int reap_kids __P((int waitfor));
210 static void update_db_entry __P((void));
211 static void add_db_key __P((const char *));
212 static void delete_db_key __P((const char *));
213 static void cleanup_db __P((void));
216 static void handle_events __P((void));
217 static void print_link_stats __P((void));
219 extern char *ttyname __P((int));
220 extern char *getlogin __P((void));
221 int main __P((int, char *[]));
225 #define O_NONBLOCK O_NDELAY
229 #define setlogmask(x)
233 * PPP Data Link Layer "protocol" table.
234 * One entry per supported protocol.
235 * The last entry must be NULL.
237 struct protent *protocols[] = {
261 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
263 #if !defined(PPP_DRV_NAME)
264 #define PPP_DRV_NAME "ppp"
265 #endif /* !defined(PPP_DRV_NAME) */
275 struct protent *protp;
278 link_stats_valid = 0;
279 new_phase(PHASE_INITIALIZE);
282 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
283 * This way we can close 0, 1, 2 in detach() without clobbering
284 * a fd that we are using.
286 if ((i = open("/dev/null", O_RDWR)) >= 0) {
287 while (0 <= i && i <= 2)
295 /* Initialize syslog facilities */
298 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
299 option_error("Couldn't get hostname: %m");
302 hostname[MAXNAMELEN-1] = 0;
304 /* make sure we don't create world or group writable files. */
305 umask(umask(0777) | 022);
308 privileged = uid == 0;
309 slprintf(numbuf, sizeof(numbuf), "%d", uid);
310 script_setenv("ORIG_UID", numbuf, 0);
312 ngroups = getgroups(NGROUPS_MAX, groups);
315 * Initialize magic number generator now so that protocols may
316 * use magic numbers in initialization.
321 * Initialize each protocol.
323 for (i = 0; (protp = protocols[i]) != NULL; ++i)
327 * Initialize the default channel.
334 * Parse, in order, the system options file, the user's options file,
335 * and the command line arguments.
337 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
338 || !options_from_user()
339 || !parse_args(argc-1, argv+1))
340 exit(EXIT_OPTION_ERROR);
341 devnam_fixed = 1; /* can no longer change device name */
344 * Work out the device name, if it hasn't already been specified,
345 * and parse the tty's options file.
347 if (the_channel->process_extra_options)
348 (*the_channel->process_extra_options)();
351 setlogmask(LOG_UPTO(LOG_DEBUG));
354 * Check that we are running as root.
356 if (geteuid() != 0) {
357 option_error("must be root to run %s, since it is not setuid-root",
362 if (!ppp_available()) {
363 option_error("%s", no_ppp_msg);
364 exit(EXIT_NO_KERNEL_SUPPORT);
368 * Check that the options given are valid and consistent.
371 if (!sys_check_options())
372 exit(EXIT_OPTION_ERROR);
373 auth_check_options();
374 #ifdef HAVE_MULTILINK
377 for (i = 0; (protp = protocols[i]) != NULL; ++i)
378 if (protp->check_options != NULL)
379 (*protp->check_options)();
380 if (the_channel->check_options)
381 (*the_channel->check_options)();
384 if (dump_options || dryrun) {
385 init_pr_log(NULL, LOG_INFO);
386 print_options(pr_log, NULL);
391 * Early check for remote number authorization.
393 if (!auth_number()) {
394 warn("calling number %q is not authorized", remote_number);
395 exit(EXIT_CNID_AUTH_FAILED);
402 * Initialize system-dependent stuff.
407 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
409 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
412 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
414 warn("Warning: disabling multilink");
421 * Detach ourselves from the terminal, if required,
422 * and identify who is running us.
424 if (!nodetach && !updetach)
429 if (pw != NULL && pw->pw_name != NULL)
434 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
435 script_setenv("PPPLOGNAME", p, 0);
438 script_setenv("DEVICE", devnam, 1);
439 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
440 script_setenv("PPPD_PID", numbuf, 1);
446 create_linkpidfile();
449 * If we're doing dial-on-demand, set up the interface now.
453 * Open the loopback channel and set it up to be the ppp interface.
456 tdb_writelock(pppdb);
458 fd_loop = open_ppp_loopback();
461 tdb_writeunlock(pppdb);
464 * Configure the interface and mark it up, etc.
477 doing_callback = do_callback;
480 if (demand && !doing_callback) {
482 * Don't do anything until we see some activity.
484 new_phase(PHASE_DORMANT);
489 if (kill_link && !persist)
491 if (get_loop_output())
495 if (kill_link && !persist)
499 * Now we want to bring up the link.
502 info("Starting link");
505 new_phase(PHASE_SERIALCONN);
507 devfd = the_channel->connect();
511 /* set up the serial device as a ppp interface */
513 tdb_writelock(pppdb);
515 fd_ppp = the_channel->establish_ppp(devfd);
518 tdb_writeunlock(pppdb);
520 status = EXIT_FATAL_ERROR;
524 if (!demand && ifunit >= 0)
527 tdb_writeunlock(pppdb);
531 * Start opening the connection and wait for
532 * incoming events (reply, timeout, etc.).
535 notice("Connect: %s <--> %s", ifname, ppp_devnam);
537 notice("Starting negotiation on %s", ppp_devnam);
538 gettimeofday(&start_time, NULL);
539 script_unsetenv("CONNECT_TIME");
540 script_unsetenv("BYTES_SENT");
541 script_unsetenv("BYTES_RCVD");
545 lcp_open(0); /* Start protocol */
546 status = EXIT_NEGOTIATION_FAILED;
547 new_phase(PHASE_ESTABLISH);
548 while (phase != PHASE_DEAD) {
552 lcp_close(0, "User request");
554 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
555 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
556 (*ccp_protent.open)(0);
564 * Delete pid file before disestablishing ppp. Otherwise it
565 * can happen that another pppd gets the same unit and then
566 * we delete its pid file.
569 if (pidfilename[0] != 0
570 && unlink(pidfilename) < 0 && errno != ENOENT)
571 warn("unable to delete pid file %s: %m", pidfilename);
576 * If we may want to bring the link up again, transfer
577 * the ppp unit back to the loopback. Set the
578 * real serial device back to its normal mode of operation.
582 the_channel->disestablish_ppp(devfd);
587 script_unsetenv("IFNAME");
590 * Run disconnector script, if requested.
591 * XXX we may not be able to do this if the line has hung up!
594 new_phase(PHASE_DISCONNECT);
595 the_channel->disconnect();
598 if (the_channel->cleanup)
599 (*the_channel->cleanup)();
602 if (pidfilename[0] != 0
603 && unlink(pidfilename) < 0 && errno != ENOENT)
604 warn("unable to delete pid file %s: %m", pidfilename);
608 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
613 t = need_holdoff? holdoff: 0;
615 t = (*holdoff_hook)();
617 new_phase(PHASE_HOLDOFF);
618 TIMEOUT(holdoff_end, NULL, t);
622 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
623 } while (phase == PHASE_HOLDOFF);
629 /* Wait for scripts to finish */
630 /* XXX should have a timeout here */
631 while (n_children > 0) {
633 struct subprocess *chp;
634 dbglog("Waiting for %d child processes...", n_children);
635 for (chp = children; chp != NULL; chp = chp->next)
636 dbglog(" script %s, pid %d", chp->prog, chp->pid);
638 if (reap_kids(1) < 0)
647 * handle_events - wait for something to happen and respond to it.
655 kill_link = open_ccp_flag = 0;
656 if (sigsetjmp(sigjmp, 1) == 0) {
657 sigprocmask(SIG_BLOCK, &mask, NULL);
658 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
659 sigprocmask(SIG_UNBLOCK, &mask, NULL);
662 sigprocmask(SIG_UNBLOCK, &mask, NULL);
663 wait_input(timeleft(&timo));
671 if (status != EXIT_HANGUP)
672 status = EXIT_USER_REQUEST;
677 status = EXIT_USER_REQUEST;
681 reap_kids(0); /* Don't leave dead kids lying around */
691 * setup_signals - initialize signal handling.
700 * Compute mask of all interesting signals and install signal handlers
701 * for each. Only one signal handler may be active at a time. Therefore,
702 * all other signals should be masked when any handler is executing.
705 sigaddset(&mask, SIGHUP);
706 sigaddset(&mask, SIGINT);
707 sigaddset(&mask, SIGTERM);
708 sigaddset(&mask, SIGCHLD);
709 sigaddset(&mask, SIGUSR2);
711 #define SIGNAL(s, handler) do { \
712 sa.sa_handler = handler; \
713 if (sigaction(s, &sa, NULL) < 0) \
714 fatal("Couldn't establish signal handler (%d): %m", s); \
719 SIGNAL(SIGHUP, hup); /* Hangup */
720 SIGNAL(SIGINT, term); /* Interrupt */
721 SIGNAL(SIGTERM, term); /* Terminate */
722 SIGNAL(SIGCHLD, chld);
724 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
725 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
728 * Install a handler for other signals which would otherwise
729 * cause pppd to exit without cleaning up.
731 SIGNAL(SIGABRT, bad_signal);
732 SIGNAL(SIGALRM, bad_signal);
733 SIGNAL(SIGFPE, bad_signal);
734 SIGNAL(SIGILL, bad_signal);
735 SIGNAL(SIGPIPE, bad_signal);
736 SIGNAL(SIGQUIT, bad_signal);
737 SIGNAL(SIGSEGV, bad_signal);
739 SIGNAL(SIGBUS, bad_signal);
742 SIGNAL(SIGEMT, bad_signal);
745 SIGNAL(SIGPOLL, bad_signal);
748 SIGNAL(SIGPROF, bad_signal);
751 SIGNAL(SIGSYS, bad_signal);
754 SIGNAL(SIGTRAP, bad_signal);
757 SIGNAL(SIGVTALRM, bad_signal);
760 SIGNAL(SIGXCPU, bad_signal);
763 SIGNAL(SIGXFSZ, bad_signal);
767 * Apparently we can get a SIGPIPE when we call syslog, if
768 * syslogd has died and been restarted. Ignoring it seems
771 signal(SIGPIPE, SIG_IGN);
775 * set_ifunit - do things we need to do once we know which ppp
782 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
783 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
784 script_setenv("IFNAME", ifname, iskey);
786 create_pidfile(); /* write pid to file */
787 create_linkpidfile();
792 * detach - detach us from the controlling terminal.
802 if ((pid = fork()) < 0) {
803 error("Couldn't detach (fork failed: %m)");
804 die(1); /* or just return? */
808 notify(pidchange, pid);
809 exit(0); /* parent dies */
819 /* update pid files if they have been written already */
823 create_linkpidfile();
824 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
825 script_setenv("PPPD_PID", numbuf, 1);
829 * reopen_log - (re)open our connection to syslog.
835 openlog("pppd", LOG_PID);
837 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
838 setlogmask(LOG_UPTO(LOG_INFO));
843 * Create a file containing our process ID.
850 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
851 _PATH_VARRUN, ifname);
852 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
853 fprintf(pidfile, "%d\n", getpid());
854 (void) fclose(pidfile);
856 error("Failed to create pid file %s: %m", pidfilename);
866 if (linkname[0] == 0)
868 script_setenv("LINKNAME", linkname, 1);
869 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
870 _PATH_VARRUN, linkname);
871 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
872 fprintf(pidfile, "%d\n", getpid());
874 fprintf(pidfile, "%s\n", ifname);
875 (void) fclose(pidfile);
877 error("Failed to create pid file %s: %m", linkpidfile);
883 * holdoff_end - called via a timeout when the holdoff period ends.
889 new_phase(PHASE_DORMANT);
892 /* List of protocol names, to make our messages a little more informative. */
893 struct protocol_list {
896 } protocol_list[] = {
898 { 0x23, "OSI Network Layer" },
899 { 0x25, "Xerox NS IDP" },
900 { 0x27, "DECnet Phase IV" },
901 { 0x29, "Appletalk" },
902 { 0x2b, "Novell IPX" },
903 { 0x2d, "VJ compressed TCP/IP" },
904 { 0x2f, "VJ uncompressed TCP/IP" },
905 { 0x31, "Bridging PDU" },
906 { 0x33, "Stream Protocol ST-II" },
907 { 0x35, "Banyan Vines" },
908 { 0x39, "AppleTalk EDDP" },
909 { 0x3b, "AppleTalk SmartBuffered" },
910 { 0x3d, "Multi-Link" },
911 { 0x3f, "NETBIOS Framing" },
912 { 0x41, "Cisco Systems" },
913 { 0x43, "Ascom Timeplex" },
914 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
915 { 0x47, "DCA Remote Lan" },
916 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
917 { 0x4b, "SNA over 802.2" },
919 { 0x4f, "IP6 Header Compression" },
920 { 0x6f, "Stampede Bridging" },
921 { 0xfb, "single-link compression" },
922 { 0xfd, "1st choice compression" },
923 { 0x0201, "802.1d Hello Packets" },
924 { 0x0203, "IBM Source Routing BPDU" },
925 { 0x0205, "DEC LANBridge100 Spanning Tree" },
926 { 0x0231, "Luxcom" },
927 { 0x0233, "Sigma Network Systems" },
928 { 0x8021, "Internet Protocol Control Protocol" },
929 { 0x8023, "OSI Network Layer Control Protocol" },
930 { 0x8025, "Xerox NS IDP Control Protocol" },
931 { 0x8027, "DECnet Phase IV Control Protocol" },
932 { 0x8029, "Appletalk Control Protocol" },
933 { 0x802b, "Novell IPX Control Protocol" },
934 { 0x8031, "Bridging NCP" },
935 { 0x8033, "Stream Protocol Control Protocol" },
936 { 0x8035, "Banyan Vines Control Protocol" },
937 { 0x803d, "Multi-Link Control Protocol" },
938 { 0x803f, "NETBIOS Framing Control Protocol" },
939 { 0x8041, "Cisco Systems Control Protocol" },
940 { 0x8043, "Ascom Timeplex" },
941 { 0x8045, "Fujitsu LBLB Control Protocol" },
942 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
943 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
944 { 0x804b, "SNA over 802.2 Control Protocol" },
945 { 0x804d, "SNA Control Protocol" },
946 { 0x804f, "IP6 Header Compression Control Protocol" },
947 { 0x006f, "Stampede Bridging Control Protocol" },
948 { 0x80fb, "Single Link Compression Control Protocol" },
949 { 0x80fd, "Compression Control Protocol" },
950 { 0xc021, "Link Control Protocol" },
951 { 0xc023, "Password Authentication Protocol" },
952 { 0xc025, "Link Quality Report" },
953 { 0xc027, "Shiva Password Authentication Protocol" },
954 { 0xc029, "CallBack Control Protocol (CBCP)" },
955 { 0xc081, "Container Control Protocol" },
956 { 0xc223, "Challenge Handshake Authentication Protocol" },
957 { 0xc281, "Proprietary Authentication Protocol" },
962 * protocol_name - find a name for a PPP protocol.
968 struct protocol_list *lp;
970 for (lp = protocol_list; lp->proto != 0; ++lp)
971 if (proto == lp->proto)
977 * get_input - called when incoming data is available.
985 struct protent *protp;
987 p = inpacket_buf; /* point to beginning of packet buffer */
989 len = read_packet(inpacket_buf);
994 notice("Modem hangup");
996 status = EXIT_HANGUP;
997 lcp_lowerdown(0); /* serial link is no longer available */
1002 if (len < PPP_HDRLEN) {
1003 dbglog("received short packet:%.*B", len, p);
1007 dump_packet("rcvd", p, len);
1008 if (snoop_recv_hook) snoop_recv_hook(p, len);
1010 p += 2; /* Skip address and control */
1011 GETSHORT(protocol, p);
1015 * Toss all non-LCP packets unless LCP is OPEN.
1017 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1018 dbglog("Discarded non-LCP packet when LCP not open");
1023 * Until we get past the authentication phase, toss all packets
1024 * except LCP, LQR and authentication packets.
1026 if (phase <= PHASE_AUTHENTICATE
1027 && !(protocol == PPP_LCP || protocol == PPP_LQR
1028 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1029 protocol == PPP_EAP)) {
1030 dbglog("discarding proto 0x%x in phase %d",
1036 * Upcall the proper protocol input routine.
1038 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1039 if (protp->protocol == protocol && protp->enabled_flag) {
1040 (*protp->input)(0, p, len);
1043 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1044 && protp->datainput != NULL) {
1045 (*protp->datainput)(0, p, len);
1051 const char *pname = protocol_name(protocol);
1053 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1055 warn("Unsupported protocol 0x%x received", protocol);
1057 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1061 * new_phase - signal the start of a new phase of pppd's operation.
1069 (*new_phase_hook)(p);
1070 notify(phasechange, p);
1074 * die - clean up state and exit with the specified status.
1082 notify(exitnotify, status);
1083 syslog(LOG_INFO, "Exit.");
1088 * cleanup - restore anything which needs to be restored before we exit
1097 the_channel->disestablish_ppp(devfd);
1098 if (the_channel->cleanup)
1099 (*the_channel->cleanup)();
1101 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1102 warn("unable to delete pid file %s: %m", pidfilename);
1104 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1105 warn("unable to delete pid file %s: %m", linkpidfile);
1119 * Print connect time and statistics.
1121 if (link_stats_valid) {
1122 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1123 info("Connect time %d.%d minutes.", t/10, t%10);
1124 info("Sent %u bytes, received %u bytes.",
1125 link_stats.bytes_out, link_stats.bytes_in);
1130 * update_link_stats - get stats at link termination.
1133 update_link_stats(u)
1139 if (!get_ppp_stats(u, &link_stats)
1140 || gettimeofday(&now, NULL) < 0)
1142 link_connect_time = now.tv_sec - start_time.tv_sec;
1143 link_stats_valid = 1;
1145 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1146 script_setenv("CONNECT_TIME", numbuf, 0);
1147 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1148 script_setenv("BYTES_SENT", numbuf, 0);
1149 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1150 script_setenv("BYTES_RCVD", numbuf, 0);
1155 struct timeval c_time; /* time at which to call routine */
1156 void *c_arg; /* argument to routine */
1157 void (*c_func) __P((void *)); /* routine */
1158 struct callout *c_next;
1161 static struct callout *callout = NULL; /* Callout list */
1162 static struct timeval timenow; /* Current time */
1165 * timeout - Schedule a timeout.
1168 timeout(func, arg, secs, usecs)
1169 void (*func) __P((void *));
1173 struct callout *newp, *p, **pp;
1175 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1181 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1182 fatal("Out of memory in timeout()!");
1184 newp->c_func = func;
1185 gettimeofday(&timenow, NULL);
1186 newp->c_time.tv_sec = timenow.tv_sec + secs;
1187 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1188 if (newp->c_time.tv_usec >= 1000000) {
1189 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1190 newp->c_time.tv_usec %= 1000000;
1194 * Find correct place and link it in.
1196 for (pp = &callout; (p = *pp); pp = &p->c_next)
1197 if (newp->c_time.tv_sec < p->c_time.tv_sec
1198 || (newp->c_time.tv_sec == p->c_time.tv_sec
1199 && newp->c_time.tv_usec < p->c_time.tv_usec))
1207 * untimeout - Unschedule a timeout.
1210 untimeout(func, arg)
1211 void (*func) __P((void *));
1214 struct callout **copp, *freep;
1216 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1219 * Find first matching timeout and remove it from the list.
1221 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1222 if (freep->c_func == func && freep->c_arg == arg) {
1223 *copp = freep->c_next;
1224 free((char *) freep);
1231 * calltimeout - Call any timeout routines which are now due.
1238 while (callout != NULL) {
1241 if (gettimeofday(&timenow, NULL) < 0)
1242 fatal("Failed to get time of day: %m");
1243 if (!(p->c_time.tv_sec < timenow.tv_sec
1244 || (p->c_time.tv_sec == timenow.tv_sec
1245 && p->c_time.tv_usec <= timenow.tv_usec)))
1246 break; /* no, it's not time yet */
1248 callout = p->c_next;
1249 (*p->c_func)(p->c_arg);
1257 * timeleft - return the length of time until the next timeout is due.
1259 static struct timeval *
1261 struct timeval *tvp;
1263 if (callout == NULL)
1266 gettimeofday(&timenow, NULL);
1267 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1268 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1269 if (tvp->tv_usec < 0) {
1270 tvp->tv_usec += 1000000;
1273 if (tvp->tv_sec < 0)
1274 tvp->tv_sec = tvp->tv_usec = 0;
1281 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1287 struct sigaction act, oldact;
1289 act.sa_handler = SIG_IGN;
1292 sigaction(sig, &act, &oldact);
1293 sigaction(sig, &oldact, NULL);
1298 * hup - Catch SIGHUP signal.
1300 * Indicates that the physical layer has been disconnected.
1301 * We don't rely on this indication; if the user has sent this
1302 * signal, we just take the link down.
1308 info("Hangup (SIGHUP)");
1311 /* Send the signal to the [dis]connector process(es) also */
1313 notify(sigreceived, sig);
1315 siglongjmp(sigjmp, 1);
1320 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1322 * Indicates that we should initiate a graceful disconnect and exit.
1329 info("Terminating on signal %d.", sig);
1332 /* Send the signal to the [dis]connector process(es) also */
1334 notify(sigreceived, sig);
1336 siglongjmp(sigjmp, 1);
1341 * chld - Catch SIGCHLD signal.
1342 * Sets a flag so we will call reap_kids in the mainline.
1350 siglongjmp(sigjmp, 1);
1355 * toggle_debug - Catch SIGUSR1 signal.
1357 * Toggle debug flag.
1366 setlogmask(LOG_UPTO(LOG_DEBUG));
1368 setlogmask(LOG_UPTO(LOG_WARNING));
1374 * open_ccp - Catch SIGUSR2 signal.
1376 * Try to (re)negotiate compression.
1385 siglongjmp(sigjmp, 1);
1390 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1396 static int crashed = 0;
1401 error("Fatal signal %d", sig);
1403 kill_my_pg(SIGTERM);
1404 notify(sigreceived, sig);
1410 * device_script - run a program to talk to the specified fds
1411 * (e.g. to run the connector or disconnector script).
1412 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1415 device_script(program, in, out, dont_wait)
1429 error("Failed to create child process: %m");
1435 record_child(pid, program, NULL, NULL);
1438 while (waitpid(pid, &status, 0) < 0) {
1441 fatal("error waiting for (dis)connection process: %m");
1445 return (status == 0 ? 0 : -1);
1448 /* here we are executing in the child */
1449 /* make sure fds 0, 1, 2 are occupied */
1450 while ((fd = dup(in)) >= 0) {
1457 /* dup in and out to fds > 2 */
1459 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1463 if (log_to_fd >= 0) {
1464 errfd = dup(log_to_fd);
1466 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1473 /* close fds 0 - 2 and any others we can think of */
1478 if (the_channel->close)
1479 (*the_channel->close)();
1482 /* dup the in, out, err fds to 0, 1, 2 */
1493 if (getuid() != uid) {
1494 error("setuid failed");
1498 execl("/bin/sh", "sh", "-c", program, (char *)0);
1499 error("could not exec /bin/sh: %m");
1506 * run-program - execute a program with given arguments,
1507 * but don't wait for it.
1508 * If the program can't be executed, logs an error unless
1509 * must_exist is 0 and the program file doesn't exist.
1510 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1511 * or isn't an executable plain file, or the process ID of the child.
1512 * If done != NULL, (*done)(arg) will be called later (within
1513 * reap_kids) iff the return value is > 0.
1516 run_program(prog, args, must_exist, done, arg)
1520 void (*done) __P((void *));
1527 * First check if the file exists and is executable.
1528 * We don't use access() because that would use the
1529 * real user-id, which might not be root, and the script
1530 * might be accessible only to root.
1533 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1534 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1535 if (must_exist || errno != ENOENT)
1536 warn("Can't execute %s: %m", prog);
1542 error("Failed to create child process for %s: %m", prog);
1548 /* Leave the current location */
1549 (void) setsid(); /* No controlling tty. */
1550 (void) umask (S_IRWXG|S_IRWXO);
1551 (void) chdir ("/"); /* no current directory. */
1552 setuid(0); /* set real UID = root */
1555 /* Ensure that nothing of our device environment is inherited. */
1561 if (the_channel->close)
1562 (*the_channel->close)();
1564 /* Don't pass handles to the PPP device, even by accident. */
1565 new_fd = open (_PATH_DEVNULL, O_RDWR);
1568 dup2 (new_fd, 0); /* stdin <- /dev/null */
1571 dup2 (0, 1); /* stdout -> /dev/null */
1572 dup2 (0, 2); /* stderr -> /dev/null */
1576 /* Force the priority back to zero if pppd is running higher. */
1577 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1578 warn("can't reset priority to 0: %m");
1581 /* SysV recommends a second fork at this point. */
1583 /* run the program */
1584 execve(prog, args, script_env);
1585 if (must_exist || errno != ENOENT) {
1586 /* have to reopen the log, there's nowhere else
1587 for the message to go. */
1589 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1596 dbglog("Script %s started (pid %d)", prog, pid);
1597 record_child(pid, prog, done, arg);
1604 * record_child - add a child process to the list for reap_kids
1608 record_child(pid, prog, done, arg)
1611 void (*done) __P((void *));
1614 struct subprocess *chp;
1618 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1620 warn("losing track of %s process", prog);
1626 chp->next = children;
1633 * reap_kids - get status from any dead child processes,
1634 * and log a message for abnormal terminations.
1641 struct subprocess *chp, **prevp;
1643 if (n_children == 0)
1645 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1647 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1648 if (chp->pid == pid) {
1654 if (WIFSIGNALED(status)) {
1655 warn("Child process %s (pid %d) terminated with signal %d",
1656 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1658 dbglog("Script %s finished (pid %d), status = 0x%x",
1659 (chp? chp->prog: "??"), pid,
1660 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1661 if (chp && chp->done)
1662 (*chp->done)(chp->arg);
1667 if (errno == ECHILD)
1670 error("Error waiting for child process: %m");
1676 * add_notifier - add a new function to be called when something happens.
1679 add_notifier(notif, func, arg)
1680 struct notifier **notif;
1684 struct notifier *np;
1686 np = malloc(sizeof(struct notifier));
1688 novm("notifier struct");
1696 * remove_notifier - remove a function from the list of things to
1697 * be called when something happens.
1700 remove_notifier(notif, func, arg)
1701 struct notifier **notif;
1705 struct notifier *np;
1707 for (; (np = *notif) != 0; notif = &np->next) {
1708 if (np->func == func && np->arg == arg) {
1717 * notify - call a set of functions registered with add_notifier.
1721 struct notifier *notif;
1724 struct notifier *np;
1726 while ((np = notif) != 0) {
1728 (*np->func)(np->arg, val);
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, iskey)
1751 size_t varl = strlen(var);
1752 size_t vl = varl + strlen(value) + 2;
1754 char *p, *newstring;
1756 newstring = (char *) malloc(vl+1);
1759 *newstring++ = iskey;
1760 slprintf(newstring, vl, "%s=%s", var, value);
1762 /* check if this variable is already set */
1763 if (script_env != 0) {
1764 for (i = 0; (p = script_env[i]) != 0; ++i) {
1765 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1767 if (p[-1] && pppdb != NULL)
1771 script_env[i] = newstring;
1773 if (iskey && pppdb != NULL)
1774 add_db_key(newstring);
1781 /* no space allocated for script env. ptrs. yet */
1783 script_env = (char **) malloc(16 * sizeof(char *));
1784 if (script_env == 0)
1789 /* reallocate script_env with more space if needed */
1790 if (i + 1 >= s_env_nalloc) {
1792 char **newenv = (char **) realloc((void *)script_env,
1793 new_n * sizeof(char *));
1796 script_env = newenv;
1797 s_env_nalloc = new_n;
1800 script_env[i] = newstring;
1801 script_env[i+1] = 0;
1804 if (pppdb != NULL) {
1806 add_db_key(newstring);
1813 * script_unsetenv - remove a variable from the environment
1817 script_unsetenv(var)
1820 int vl = strlen(var);
1824 if (script_env == 0)
1826 for (i = 0; (p = script_env[i]) != 0; ++i) {
1827 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1829 if (p[-1] && pppdb != NULL)
1833 while ((script_env[i] = script_env[i+1]) != 0)
1846 * update_db_entry - update our entry in the database.
1855 if (script_env == NULL)
1858 for (i = 0; (p = script_env[i]) != 0; ++i)
1859 vlen += strlen(p) + 1;
1860 vbuf = malloc(vlen);
1862 novm("database entry");
1864 for (i = 0; (p = script_env[i]) != 0; ++i)
1865 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1868 key.dsize = strlen(db_key);
1871 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1872 error("tdb_store failed: %s", tdb_error(pppdb));
1880 * add_db_key - add a key that we can use to look up our database entry.
1888 key.dptr = (char *) str;
1889 key.dsize = strlen(str);
1891 dbuf.dsize = strlen(db_key);
1892 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1893 error("tdb_store key failed: %s", tdb_error(pppdb));
1897 * delete_db_key - delete a key for looking up our database entry.
1905 key.dptr = (char *) str;
1906 key.dsize = strlen(str);
1907 tdb_delete(pppdb, key);
1911 * cleanup_db - delete all the entries we put in the database.
1921 key.dsize = strlen(db_key);
1922 tdb_delete(pppdb, key);
1923 for (i = 0; (p = script_env[i]) != 0; ++i)
1927 #endif /* USE_TDB */