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.
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14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
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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
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31 * "This product includes software developed by Computing Services
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34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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43 #define RCSID "$Id: main.c,v 1.140 2004/11/04 09:56:26 paulus 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;
116 struct notifier *fork_notifier = NULL;
118 int hungup; /* terminal has been hung up */
119 int privileged; /* we're running as real uid root */
120 int need_holdoff; /* need holdoff period before restarting */
121 int detached; /* have detached from terminal */
122 volatile int status; /* exit status for pppd */
123 int unsuccess; /* # unsuccessful connection attempts */
124 int do_callback; /* != 0 if we should do callback next */
125 int doing_callback; /* != 0 if we are doing callback */
126 int ppp_session_number; /* Session number, for channels with such a
127 concept (eg PPPoE) */
128 int childwait_done; /* have timed out waiting for children */
131 TDB_CONTEXT *pppdb; /* database for storing status etc. */
136 int (*holdoff_hook) __P((void)) = NULL;
137 int (*new_phase_hook) __P((int)) = NULL;
138 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
139 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
141 static int conn_running; /* we have a [dis]connector running */
142 static int devfd; /* fd of underlying device */
143 static int fd_ppp = -1; /* fd for talking PPP */
144 static int fd_loop; /* fd for getting demand-dial packets */
145 static int fd_devnull; /* fd for /dev/null */
147 int phase; /* where the link is at */
155 static sigset_t signals_handled;
157 static sigjmp_buf sigjmp;
159 char **script_env; /* Env. variable values for scripts */
160 int s_env_nalloc; /* # words avail at script_env */
162 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
163 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
165 static int n_children; /* # child processes still running */
166 static int got_sigchld; /* set if we have received a SIGCHLD */
168 int privopen; /* don't lock, open device as root */
170 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
172 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
173 int ngroups; /* How many groups valid in groups */
175 static struct timeval start_time; /* Time when link was started. */
177 static struct pppd_stats old_link_stats;
178 struct pppd_stats link_stats;
179 unsigned link_connect_time;
180 int link_stats_valid;
185 * We maintain a list of child process pids and
186 * functions to call when they exit.
191 void (*done) __P((void *));
193 struct subprocess *next;
196 static struct subprocess *children;
198 /* Prototypes for procedures local to this file. */
200 static void setup_signals __P((void));
201 static void create_pidfile __P((int pid));
202 static void create_linkpidfile __P((int pid));
203 static void cleanup __P((void));
204 static void get_input __P((void));
205 static void calltimeout __P((void));
206 static struct timeval *timeleft __P((struct timeval *));
207 static void kill_my_pg __P((int));
208 static void hup __P((int));
209 static void term __P((int));
210 static void chld __P((int));
211 static void toggle_debug __P((int));
212 static void open_ccp __P((int));
213 static void bad_signal __P((int));
214 static void holdoff_end __P((void *));
215 static int reap_kids __P((void));
216 static void childwait_end __P((void *));
219 static void update_db_entry __P((void));
220 static void add_db_key __P((const char *));
221 static void delete_db_key __P((const char *));
222 static void cleanup_db __P((void));
225 static void handle_events __P((void));
226 void print_link_stats __P((void));
228 extern char *ttyname __P((int));
229 extern char *getlogin __P((void));
230 int main __P((int, char *[]));
234 #define O_NONBLOCK O_NDELAY
238 #define setlogmask(x)
242 * PPP Data Link Layer "protocol" table.
243 * One entry per supported protocol.
244 * The last entry must be NULL.
246 struct protent *protocols[] = {
270 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
272 #if !defined(PPP_DRV_NAME)
273 #define PPP_DRV_NAME "ppp"
274 #endif /* !defined(PPP_DRV_NAME) */
284 struct protent *protp;
287 link_stats_valid = 0;
288 new_phase(PHASE_INITIALIZE);
292 /* Initialize syslog facilities */
295 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
296 option_error("Couldn't get hostname: %m");
299 hostname[MAXNAMELEN-1] = 0;
301 /* make sure we don't create world or group writable files. */
302 umask(umask(0777) | 022);
305 privileged = uid == 0;
306 slprintf(numbuf, sizeof(numbuf), "%d", uid);
307 script_setenv("ORIG_UID", numbuf, 0);
309 ngroups = getgroups(NGROUPS_MAX, groups);
312 * Initialize magic number generator now so that protocols may
313 * use magic numbers in initialization.
318 * Initialize each protocol.
320 for (i = 0; (protp = protocols[i]) != NULL; ++i)
324 * Initialize the default channel.
331 * Parse, in order, the system options file, the user's options file,
332 * and the command line arguments.
334 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
335 || !options_from_user()
336 || !parse_args(argc-1, argv+1))
337 exit(EXIT_OPTION_ERROR);
338 devnam_fixed = 1; /* can no longer change device name */
341 * Work out the device name, if it hasn't already been specified,
342 * and parse the tty's options file.
344 if (the_channel->process_extra_options)
345 (*the_channel->process_extra_options)();
348 setlogmask(LOG_UPTO(LOG_DEBUG));
351 * Check that we are running as root.
353 if (geteuid() != 0) {
354 option_error("must be root to run %s, since it is not setuid-root",
359 if (!ppp_available()) {
360 option_error("%s", no_ppp_msg);
361 exit(EXIT_NO_KERNEL_SUPPORT);
365 * Check that the options given are valid and consistent.
368 if (!sys_check_options())
369 exit(EXIT_OPTION_ERROR);
370 auth_check_options();
371 #ifdef HAVE_MULTILINK
374 for (i = 0; (protp = protocols[i]) != NULL; ++i)
375 if (protp->check_options != NULL)
376 (*protp->check_options)();
377 if (the_channel->check_options)
378 (*the_channel->check_options)();
381 if (dump_options || dryrun) {
382 init_pr_log(NULL, LOG_INFO);
383 print_options(pr_log, NULL);
391 * Initialize system-dependent stuff.
395 /* Make sure fds 0, 1, 2 are open to somewhere. */
396 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
398 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
399 while (fd_devnull <= 2) {
402 fatal("Critical shortage of file descriptors: dup failed: %m");
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);
447 * If we're doing dial-on-demand, set up the interface now.
451 * Open the loopback channel and set it up to be the ppp interface.
454 tdb_writelock(pppdb);
456 fd_loop = open_ppp_loopback();
459 tdb_writeunlock(pppdb);
462 * Configure the interface and mark it up, etc.
465 create_linkpidfile(getpid());
476 doing_callback = do_callback;
479 if (demand && !doing_callback) {
481 * Don't do anything until we see some activity.
483 new_phase(PHASE_DORMANT);
488 if (kill_link && !persist)
490 if (get_loop_output())
494 if (kill_link && !persist)
498 * Now we want to bring up the link.
501 info("Starting link");
504 new_phase(PHASE_SERIALCONN);
506 devfd = the_channel->connect();
510 /* set up the serial device as a ppp interface */
512 tdb_writelock(pppdb);
514 fd_ppp = the_channel->establish_ppp(devfd);
517 tdb_writeunlock(pppdb);
519 status = EXIT_FATAL_ERROR;
522 /* create the pid file, now that we've obtained a ppp interface */
524 create_linkpidfile(getpid());
526 if (!demand && ifunit >= 0)
529 tdb_writeunlock(pppdb);
533 * Start opening the connection and wait for
534 * incoming events (reply, timeout, etc.).
537 notice("Connect: %s <--> %s", ifname, ppp_devnam);
539 notice("Starting negotiation on %s", ppp_devnam);
540 gettimeofday(&start_time, NULL);
541 script_unsetenv("CONNECT_TIME");
542 script_unsetenv("BYTES_SENT");
543 script_unsetenv("BYTES_RCVD");
547 lcp_open(0); /* Start protocol */
548 status = EXIT_NEGOTIATION_FAILED;
549 new_phase(PHASE_ESTABLISH);
550 while (phase != PHASE_DEAD) {
554 lcp_close(0, "User request");
556 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
557 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
558 (*ccp_protent.open)(0);
566 * Delete pid file before disestablishing ppp. Otherwise it
567 * can happen that another pppd gets the same unit and then
568 * we delete its pid file.
571 if (pidfilename[0] != 0
572 && unlink(pidfilename) < 0 && errno != ENOENT)
573 warn("unable to delete pid file %s: %m", pidfilename);
578 * If we may want to bring the link up again, transfer
579 * the ppp unit back to the loopback. Set the
580 * real serial device back to its normal mode of operation.
584 the_channel->disestablish_ppp(devfd);
589 script_unsetenv("IFNAME");
592 * Run disconnector script, if requested.
593 * XXX we may not be able to do this if the line has hung up!
596 new_phase(PHASE_DISCONNECT);
597 if (the_channel->disconnect)
598 the_channel->disconnect();
601 if (the_channel->cleanup)
602 (*the_channel->cleanup)();
605 if (pidfilename[0] != 0
606 && unlink(pidfilename) < 0 && errno != ENOENT)
607 warn("unable to delete pid file %s: %m", pidfilename);
611 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
616 t = need_holdoff? holdoff: 0;
618 t = (*holdoff_hook)();
620 new_phase(PHASE_HOLDOFF);
621 TIMEOUT(holdoff_end, NULL, t);
625 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
626 } while (phase == PHASE_HOLDOFF);
632 /* Wait for scripts to finish */
634 if (n_children > 0) {
636 TIMEOUT(childwait_end, NULL, child_wait);
638 struct subprocess *chp;
639 dbglog("Waiting for %d child processes...", n_children);
640 for (chp = children; chp != NULL; chp = chp->next)
641 dbglog(" script %s, pid %d", chp->prog, chp->pid);
643 while (n_children > 0 && !childwait_done) {
645 if (kill_link && !childwait_done)
655 * handle_events - wait for something to happen and respond to it.
662 kill_link = open_ccp_flag = 0;
663 if (sigsetjmp(sigjmp, 1) == 0) {
664 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
665 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
666 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
669 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
670 wait_input(timeleft(&timo));
676 info("Hangup (SIGHUP)");
679 if (status != EXIT_HANGUP)
680 status = EXIT_USER_REQUEST;
683 info("Terminating on signal %d", got_sigterm);
686 status = EXIT_USER_REQUEST;
691 reap_kids(); /* Don't leave dead kids lying around */
700 * setup_signals - initialize signal handling.
708 * Compute mask of all interesting signals and install signal handlers
709 * for each. Only one signal handler may be active at a time. Therefore,
710 * all other signals should be masked when any handler is executing.
712 sigemptyset(&signals_handled);
713 sigaddset(&signals_handled, SIGHUP);
714 sigaddset(&signals_handled, SIGINT);
715 sigaddset(&signals_handled, SIGTERM);
716 sigaddset(&signals_handled, SIGCHLD);
717 sigaddset(&signals_handled, SIGUSR2);
719 #define SIGNAL(s, handler) do { \
720 sa.sa_handler = handler; \
721 if (sigaction(s, &sa, NULL) < 0) \
722 fatal("Couldn't establish signal handler (%d): %m", s); \
725 sa.sa_mask = signals_handled;
727 SIGNAL(SIGHUP, hup); /* Hangup */
728 SIGNAL(SIGINT, term); /* Interrupt */
729 SIGNAL(SIGTERM, term); /* Terminate */
730 SIGNAL(SIGCHLD, chld);
732 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
733 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
736 * Install a handler for other signals which would otherwise
737 * cause pppd to exit without cleaning up.
739 SIGNAL(SIGABRT, bad_signal);
740 SIGNAL(SIGALRM, bad_signal);
741 SIGNAL(SIGFPE, bad_signal);
742 SIGNAL(SIGILL, bad_signal);
743 SIGNAL(SIGPIPE, bad_signal);
744 SIGNAL(SIGQUIT, bad_signal);
745 SIGNAL(SIGSEGV, bad_signal);
747 SIGNAL(SIGBUS, bad_signal);
750 SIGNAL(SIGEMT, bad_signal);
753 SIGNAL(SIGPOLL, bad_signal);
756 SIGNAL(SIGPROF, bad_signal);
759 SIGNAL(SIGSYS, bad_signal);
762 SIGNAL(SIGTRAP, bad_signal);
765 SIGNAL(SIGVTALRM, bad_signal);
768 SIGNAL(SIGXCPU, bad_signal);
771 SIGNAL(SIGXFSZ, bad_signal);
775 * Apparently we can get a SIGPIPE when we call syslog, if
776 * syslogd has died and been restarted. Ignoring it seems
779 signal(SIGPIPE, SIG_IGN);
783 * set_ifunit - do things we need to do once we know which ppp
790 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
791 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
792 script_setenv("IFNAME", ifname, iskey);
794 create_pidfile(getpid()); /* write pid to file */
795 create_linkpidfile(getpid());
800 * detach - detach us from the controlling terminal.
811 if (pipe(pipefd) == -1)
812 pipefd[0] = pipefd[1] = -1;
813 if ((pid = fork()) < 0) {
814 error("Couldn't detach (fork failed: %m)");
815 die(1); /* or just return? */
819 notify(pidchange, pid);
820 /* update pid files if they have been written already */
824 create_linkpidfile(pid);
825 exit(0); /* parent dies */
835 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
836 script_setenv("PPPD_PID", numbuf, 1);
838 /* wait for parent to finish updating pid & lock files and die */
840 complete_read(pipefd[0], numbuf, 1);
845 * reopen_log - (re)open our connection to syslog.
851 openlog("pppd", LOG_PID);
853 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
854 setlogmask(LOG_UPTO(LOG_INFO));
859 * Create a file containing our process ID.
867 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
868 _PATH_VARRUN, ifname);
869 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
870 fprintf(pidfile, "%d\n", pid);
871 (void) fclose(pidfile);
873 error("Failed to create pid file %s: %m", pidfilename);
879 create_linkpidfile(pid)
884 if (linkname[0] == 0)
886 script_setenv("LINKNAME", linkname, 1);
887 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
888 _PATH_VARRUN, linkname);
889 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
890 fprintf(pidfile, "%d\n", pid);
892 fprintf(pidfile, "%s\n", ifname);
893 (void) fclose(pidfile);
895 error("Failed to create pid file %s: %m", linkpidfile);
901 * holdoff_end - called via a timeout when the holdoff period ends.
907 new_phase(PHASE_DORMANT);
910 /* List of protocol names, to make our messages a little more informative. */
911 struct protocol_list {
914 } protocol_list[] = {
916 { 0x23, "OSI Network Layer" },
917 { 0x25, "Xerox NS IDP" },
918 { 0x27, "DECnet Phase IV" },
919 { 0x29, "Appletalk" },
920 { 0x2b, "Novell IPX" },
921 { 0x2d, "VJ compressed TCP/IP" },
922 { 0x2f, "VJ uncompressed TCP/IP" },
923 { 0x31, "Bridging PDU" },
924 { 0x33, "Stream Protocol ST-II" },
925 { 0x35, "Banyan Vines" },
926 { 0x39, "AppleTalk EDDP" },
927 { 0x3b, "AppleTalk SmartBuffered" },
928 { 0x3d, "Multi-Link" },
929 { 0x3f, "NETBIOS Framing" },
930 { 0x41, "Cisco Systems" },
931 { 0x43, "Ascom Timeplex" },
932 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
933 { 0x47, "DCA Remote Lan" },
934 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
935 { 0x4b, "SNA over 802.2" },
937 { 0x4f, "IP6 Header Compression" },
938 { 0x6f, "Stampede Bridging" },
939 { 0xfb, "single-link compression" },
940 { 0xfd, "1st choice compression" },
941 { 0x0201, "802.1d Hello Packets" },
942 { 0x0203, "IBM Source Routing BPDU" },
943 { 0x0205, "DEC LANBridge100 Spanning Tree" },
944 { 0x0231, "Luxcom" },
945 { 0x0233, "Sigma Network Systems" },
946 { 0x8021, "Internet Protocol Control Protocol" },
947 { 0x8023, "OSI Network Layer Control Protocol" },
948 { 0x8025, "Xerox NS IDP Control Protocol" },
949 { 0x8027, "DECnet Phase IV Control Protocol" },
950 { 0x8029, "Appletalk Control Protocol" },
951 { 0x802b, "Novell IPX Control Protocol" },
952 { 0x8031, "Bridging NCP" },
953 { 0x8033, "Stream Protocol Control Protocol" },
954 { 0x8035, "Banyan Vines Control Protocol" },
955 { 0x803d, "Multi-Link Control Protocol" },
956 { 0x803f, "NETBIOS Framing Control Protocol" },
957 { 0x8041, "Cisco Systems Control Protocol" },
958 { 0x8043, "Ascom Timeplex" },
959 { 0x8045, "Fujitsu LBLB Control Protocol" },
960 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
961 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
962 { 0x804b, "SNA over 802.2 Control Protocol" },
963 { 0x804d, "SNA Control Protocol" },
964 { 0x804f, "IP6 Header Compression Control Protocol" },
965 { 0x006f, "Stampede Bridging Control Protocol" },
966 { 0x80fb, "Single Link Compression Control Protocol" },
967 { 0x80fd, "Compression Control Protocol" },
968 { 0xc021, "Link Control Protocol" },
969 { 0xc023, "Password Authentication Protocol" },
970 { 0xc025, "Link Quality Report" },
971 { 0xc027, "Shiva Password Authentication Protocol" },
972 { 0xc029, "CallBack Control Protocol (CBCP)" },
973 { 0xc081, "Container Control Protocol" },
974 { 0xc223, "Challenge Handshake Authentication Protocol" },
975 { 0xc281, "Proprietary Authentication Protocol" },
980 * protocol_name - find a name for a PPP protocol.
986 struct protocol_list *lp;
988 for (lp = protocol_list; lp->proto != 0; ++lp)
989 if (proto == lp->proto)
995 * get_input - called when incoming data is available.
1003 struct protent *protp;
1005 p = inpacket_buf; /* point to beginning of packet buffer */
1007 len = read_packet(inpacket_buf);
1012 notice("Modem hangup");
1014 status = EXIT_HANGUP;
1015 lcp_lowerdown(0); /* serial link is no longer available */
1020 if (len < PPP_HDRLEN) {
1021 dbglog("received short packet:%.*B", len, p);
1025 dump_packet("rcvd", p, len);
1026 if (snoop_recv_hook) snoop_recv_hook(p, len);
1028 p += 2; /* Skip address and control */
1029 GETSHORT(protocol, p);
1033 * Toss all non-LCP packets unless LCP is OPEN.
1035 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1036 dbglog("Discarded non-LCP packet when LCP not open");
1041 * Until we get past the authentication phase, toss all packets
1042 * except LCP, LQR and authentication packets.
1044 if (phase <= PHASE_AUTHENTICATE
1045 && !(protocol == PPP_LCP || protocol == PPP_LQR
1046 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1047 protocol == PPP_EAP)) {
1048 dbglog("discarding proto 0x%x in phase %d",
1054 * Upcall the proper protocol input routine.
1056 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1057 if (protp->protocol == protocol && protp->enabled_flag) {
1058 (*protp->input)(0, p, len);
1061 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1062 && protp->datainput != NULL) {
1063 (*protp->datainput)(0, p, len);
1069 const char *pname = protocol_name(protocol);
1071 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1073 warn("Unsupported protocol 0x%x received", protocol);
1075 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1079 * ppp_send_config - configure the transmit-side characteristics of
1080 * the ppp interface. Returns -1, indicating an error, if the channel
1081 * send_config procedure called error() (or incremented error_count
1082 * itself), otherwise 0.
1085 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1092 if (the_channel->send_config == NULL)
1095 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1096 return (error_count != errs)? -1: 0;
1100 * ppp_recv_config - configure the receive-side characteristics of
1101 * the ppp interface. Returns -1, indicating an error, if the channel
1102 * recv_config procedure called error() (or incremented error_count
1103 * itself), otherwise 0.
1106 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1113 if (the_channel->recv_config == NULL)
1116 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1117 return (error_count != errs)? -1: 0;
1121 * new_phase - signal the start of a new phase of pppd's operation.
1129 (*new_phase_hook)(p);
1130 notify(phasechange, p);
1134 * die - clean up state and exit with the specified status.
1142 notify(exitnotify, status);
1143 syslog(LOG_INFO, "Exit.");
1148 * cleanup - restore anything which needs to be restored before we exit
1157 the_channel->disestablish_ppp(devfd);
1158 if (the_channel->cleanup)
1159 (*the_channel->cleanup)();
1161 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1162 warn("unable to delete pid file %s: %m", pidfilename);
1164 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1165 warn("unable to delete pid file %s: %m", linkpidfile);
1179 * Print connect time and statistics.
1181 if (link_stats_valid) {
1182 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1183 info("Connect time %d.%d minutes.", t/10, t%10);
1184 info("Sent %u bytes, received %u bytes.",
1185 link_stats.bytes_out, link_stats.bytes_in);
1186 link_stats_valid = 0;
1191 * reset_link_stats - "reset" stats when link goes up.
1197 if (!get_ppp_stats(u, &old_link_stats))
1199 gettimeofday(&start_time, NULL);
1203 * update_link_stats - get stats at link termination.
1206 update_link_stats(u)
1212 if (!get_ppp_stats(u, &link_stats)
1213 || gettimeofday(&now, NULL) < 0)
1215 link_connect_time = now.tv_sec - start_time.tv_sec;
1216 link_stats_valid = 1;
1218 link_stats.bytes_in -= old_link_stats.bytes_in;
1219 link_stats.bytes_out -= old_link_stats.bytes_out;
1220 link_stats.pkts_in -= old_link_stats.pkts_in;
1221 link_stats.pkts_out -= old_link_stats.pkts_out;
1223 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1224 script_setenv("CONNECT_TIME", numbuf, 0);
1225 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1226 script_setenv("BYTES_SENT", numbuf, 0);
1227 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1228 script_setenv("BYTES_RCVD", numbuf, 0);
1233 struct timeval c_time; /* time at which to call routine */
1234 void *c_arg; /* argument to routine */
1235 void (*c_func) __P((void *)); /* routine */
1236 struct callout *c_next;
1239 static struct callout *callout = NULL; /* Callout list */
1240 static struct timeval timenow; /* Current time */
1243 * timeout - Schedule a timeout.
1246 timeout(func, arg, secs, usecs)
1247 void (*func) __P((void *));
1251 struct callout *newp, *p, **pp;
1253 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1259 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1260 fatal("Out of memory in timeout()!");
1262 newp->c_func = func;
1263 gettimeofday(&timenow, NULL);
1264 newp->c_time.tv_sec = timenow.tv_sec + secs;
1265 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1266 if (newp->c_time.tv_usec >= 1000000) {
1267 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1268 newp->c_time.tv_usec %= 1000000;
1272 * Find correct place and link it in.
1274 for (pp = &callout; (p = *pp); pp = &p->c_next)
1275 if (newp->c_time.tv_sec < p->c_time.tv_sec
1276 || (newp->c_time.tv_sec == p->c_time.tv_sec
1277 && newp->c_time.tv_usec < p->c_time.tv_usec))
1285 * untimeout - Unschedule a timeout.
1288 untimeout(func, arg)
1289 void (*func) __P((void *));
1292 struct callout **copp, *freep;
1294 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1297 * Find first matching timeout and remove it from the list.
1299 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1300 if (freep->c_func == func && freep->c_arg == arg) {
1301 *copp = freep->c_next;
1302 free((char *) freep);
1309 * calltimeout - Call any timeout routines which are now due.
1316 while (callout != NULL) {
1319 if (gettimeofday(&timenow, NULL) < 0)
1320 fatal("Failed to get time of day: %m");
1321 if (!(p->c_time.tv_sec < timenow.tv_sec
1322 || (p->c_time.tv_sec == timenow.tv_sec
1323 && p->c_time.tv_usec <= timenow.tv_usec)))
1324 break; /* no, it's not time yet */
1326 callout = p->c_next;
1327 (*p->c_func)(p->c_arg);
1335 * timeleft - return the length of time until the next timeout is due.
1337 static struct timeval *
1339 struct timeval *tvp;
1341 if (callout == NULL)
1344 gettimeofday(&timenow, NULL);
1345 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1346 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1347 if (tvp->tv_usec < 0) {
1348 tvp->tv_usec += 1000000;
1351 if (tvp->tv_sec < 0)
1352 tvp->tv_sec = tvp->tv_usec = 0;
1359 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1360 * We assume that sig is currently blocked.
1366 struct sigaction act, oldact;
1368 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1369 act.sa_handler = SIG_IGN;
1373 * The kill() above made the signal pending for us, as well as
1374 * the rest of our process group, but we don't want it delivered
1375 * to us. It is blocked at the moment. Setting it to be ignored
1376 * will cause the pending signal to be discarded. If we did the
1377 * kill() after setting the signal to be ignored, it is unspecified
1378 * (by POSIX) whether the signal is immediately discarded or left
1379 * pending, and in fact Linux would leave it pending, and so it
1380 * would be delivered after the current signal handler exits,
1381 * leading to an infinite loop.
1383 sigaction(sig, &act, &oldact);
1384 sigaction(sig, &oldact, NULL);
1389 * hup - Catch SIGHUP signal.
1391 * Indicates that the physical layer has been disconnected.
1392 * We don't rely on this indication; if the user has sent this
1393 * signal, we just take the link down.
1399 /* can't log a message here, it can deadlock */
1402 /* Send the signal to the [dis]connector process(es) also */
1404 notify(sigreceived, sig);
1406 siglongjmp(sigjmp, 1);
1411 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1413 * Indicates that we should initiate a graceful disconnect and exit.
1420 /* can't log a message here, it can deadlock */
1423 /* Send the signal to the [dis]connector process(es) also */
1425 notify(sigreceived, sig);
1427 siglongjmp(sigjmp, 1);
1432 * chld - Catch SIGCHLD signal.
1433 * Sets a flag so we will call reap_kids in the mainline.
1441 siglongjmp(sigjmp, 1);
1446 * toggle_debug - Catch SIGUSR1 signal.
1448 * Toggle debug flag.
1457 setlogmask(LOG_UPTO(LOG_DEBUG));
1459 setlogmask(LOG_UPTO(LOG_WARNING));
1465 * open_ccp - Catch SIGUSR2 signal.
1467 * Try to (re)negotiate compression.
1476 siglongjmp(sigjmp, 1);
1481 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1487 static int crashed = 0;
1492 error("Fatal signal %d", sig);
1494 kill_my_pg(SIGTERM);
1495 notify(sigreceived, sig);
1500 * safe_fork - Create a child process. The child closes all the
1501 * file descriptors that we don't want to leak to a script.
1502 * The parent waits for the child to do this before returning.
1511 if (pipe(pipefd) == -1)
1512 pipefd[0] = pipefd[1] = -1;
1518 /* this read() blocks until the close(pipefd[1]) below */
1519 complete_read(pipefd[0], buf, 1);
1527 notify(fork_notifier, 0);
1529 /* this close unblocks the read() call above in the parent */
1535 * device_script - run a program to talk to the specified fds
1536 * (e.g. to run the connector or disconnector script).
1537 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1540 device_script(program, in, out, dont_wait)
1555 error("Failed to create child process: %m");
1561 record_child(pid, program, NULL, NULL);
1564 while (waitpid(pid, &status, 0) < 0) {
1567 fatal("error waiting for (dis)connection process: %m");
1571 return (status == 0 ? 0 : -1);
1574 /* here we are executing in the child */
1576 /* make sure fds 0, 1, 2 are occupied */
1577 while ((fd = dup(in)) >= 0) {
1584 /* dup in and out to fds > 2 */
1586 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1590 if (log_to_fd >= 0) {
1591 errfd = dup(log_to_fd);
1593 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1600 /* close fds 0 - 2 and any others we can think of */
1604 if (the_channel->close)
1605 (*the_channel->close)();
1607 close(devfd); /* some plugins don't have a close function */
1611 /* dup the in, out, err fds to 0, 1, 2 */
1622 if (getuid() != uid) {
1623 error("setuid failed");
1627 execl("/bin/sh", "sh", "-c", program, (char *)0);
1628 error("could not exec /bin/sh: %m");
1635 * run-program - execute a program with given arguments,
1636 * but don't wait for it.
1637 * If the program can't be executed, logs an error unless
1638 * must_exist is 0 and the program file doesn't exist.
1639 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1640 * or isn't an executable plain file, or the process ID of the child.
1641 * If done != NULL, (*done)(arg) will be called later (within
1642 * reap_kids) iff the return value is > 0.
1645 run_program(prog, args, must_exist, done, arg)
1649 void (*done) __P((void *));
1656 * First check if the file exists and is executable.
1657 * We don't use access() because that would use the
1658 * real user-id, which might not be root, and the script
1659 * might be accessible only to root.
1662 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1663 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1664 if (must_exist || errno != ENOENT)
1665 warn("Can't execute %s: %m", prog);
1671 error("Failed to create child process for %s: %m", prog);
1676 dbglog("Script %s started (pid %d)", prog, pid);
1677 record_child(pid, prog, done, arg);
1681 /* Leave the current location */
1682 (void) setsid(); /* No controlling tty. */
1683 (void) umask (S_IRWXG|S_IRWXO);
1684 (void) chdir ("/"); /* no current directory. */
1685 setuid(0); /* set real UID = root */
1688 /* Ensure that nothing of our device environment is inherited. */
1690 if (the_channel->close)
1691 (*the_channel->close)();
1693 /* Don't pass handles to the PPP device, even by accident. */
1694 dup2(fd_devnull, 0);
1695 dup2(fd_devnull, 1);
1696 dup2(fd_devnull, 2);
1700 /* Force the priority back to zero if pppd is running higher. */
1701 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1702 warn("can't reset priority to 0: %m");
1705 /* SysV recommends a second fork at this point. */
1707 /* run the program */
1708 execve(prog, args, script_env);
1709 if (must_exist || errno != ENOENT) {
1710 /* have to reopen the log, there's nowhere else
1711 for the message to go. */
1713 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1721 * record_child - add a child process to the list for reap_kids
1725 record_child(pid, prog, done, arg)
1728 void (*done) __P((void *));
1731 struct subprocess *chp;
1735 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1737 warn("losing track of %s process", prog);
1743 chp->next = children;
1749 * childwait_end - we got fed up waiting for the child processes to
1750 * exit, send them all a SIGTERM.
1756 struct subprocess *chp;
1758 for (chp = children; chp != NULL; chp = chp->next) {
1760 dbglog("sending SIGTERM to process %d", chp->pid);
1761 kill(chp->pid, SIGTERM);
1767 * reap_kids - get status from any dead child processes,
1768 * and log a message for abnormal terminations.
1774 struct subprocess *chp, **prevp;
1776 if (n_children == 0)
1778 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1779 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1780 if (chp->pid == pid) {
1786 if (WIFSIGNALED(status)) {
1787 warn("Child process %s (pid %d) terminated with signal %d",
1788 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1790 dbglog("Script %s finished (pid %d), status = 0x%x",
1791 (chp? chp->prog: "??"), pid,
1792 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1793 if (chp && chp->done)
1794 (*chp->done)(chp->arg);
1799 if (errno == ECHILD)
1802 error("Error waiting for child process: %m");
1808 * add_notifier - add a new function to be called when something happens.
1811 add_notifier(notif, func, arg)
1812 struct notifier **notif;
1816 struct notifier *np;
1818 np = malloc(sizeof(struct notifier));
1820 novm("notifier struct");
1828 * remove_notifier - remove a function from the list of things to
1829 * be called when something happens.
1832 remove_notifier(notif, func, arg)
1833 struct notifier **notif;
1837 struct notifier *np;
1839 for (; (np = *notif) != 0; notif = &np->next) {
1840 if (np->func == func && np->arg == arg) {
1849 * notify - call a set of functions registered with add_notifier.
1853 struct notifier *notif;
1856 struct notifier *np;
1858 while ((np = notif) != 0) {
1860 (*np->func)(np->arg, val);
1865 * novm - log an error message saying we ran out of memory, and die.
1871 fatal("Virtual memory exhausted allocating %s\n", msg);
1875 * script_setenv - set an environment variable value to be used
1876 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1879 script_setenv(var, value, iskey)
1883 size_t varl = strlen(var);
1884 size_t vl = varl + strlen(value) + 2;
1886 char *p, *newstring;
1888 newstring = (char *) malloc(vl+1);
1891 *newstring++ = iskey;
1892 slprintf(newstring, vl, "%s=%s", var, value);
1894 /* check if this variable is already set */
1895 if (script_env != 0) {
1896 for (i = 0; (p = script_env[i]) != 0; ++i) {
1897 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1899 if (p[-1] && pppdb != NULL)
1903 script_env[i] = newstring;
1905 if (iskey && pppdb != NULL)
1906 add_db_key(newstring);
1913 /* no space allocated for script env. ptrs. yet */
1915 script_env = (char **) malloc(16 * sizeof(char *));
1916 if (script_env == 0)
1921 /* reallocate script_env with more space if needed */
1922 if (i + 1 >= s_env_nalloc) {
1924 char **newenv = (char **) realloc((void *)script_env,
1925 new_n * sizeof(char *));
1928 script_env = newenv;
1929 s_env_nalloc = new_n;
1932 script_env[i] = newstring;
1933 script_env[i+1] = 0;
1936 if (pppdb != NULL) {
1938 add_db_key(newstring);
1945 * script_unsetenv - remove a variable from the environment
1949 script_unsetenv(var)
1952 int vl = strlen(var);
1956 if (script_env == 0)
1958 for (i = 0; (p = script_env[i]) != 0; ++i) {
1959 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1961 if (p[-1] && pppdb != NULL)
1965 while ((script_env[i] = script_env[i+1]) != 0)
1978 * update_db_entry - update our entry in the database.
1987 if (script_env == NULL)
1990 for (i = 0; (p = script_env[i]) != 0; ++i)
1991 vlen += strlen(p) + 1;
1992 vbuf = malloc(vlen);
1994 novm("database entry");
1996 for (i = 0; (p = script_env[i]) != 0; ++i)
1997 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2000 key.dsize = strlen(db_key);
2003 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2004 error("tdb_store failed: %s", tdb_error(pppdb));
2012 * add_db_key - add a key that we can use to look up our database entry.
2020 key.dptr = (char *) str;
2021 key.dsize = strlen(str);
2023 dbuf.dsize = strlen(db_key);
2024 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2025 error("tdb_store key failed: %s", tdb_error(pppdb));
2029 * delete_db_key - delete a key for looking up our database entry.
2037 key.dptr = (char *) str;
2038 key.dsize = strlen(str);
2039 tdb_delete(pppdb, key);
2043 * cleanup_db - delete all the entries we put in the database.
2053 key.dsize = strlen(db_key);
2054 tdb_delete(pppdb, key);
2055 for (i = 0; (p = script_env[i]) != 0; ++i)
2059 #endif /* USE_TDB */