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 1.112 2002/02/12 20:07:09 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 char remote_number[MAXNAMELEN]; /* Remote telephone number, if available */
87 uid_t uid; /* Our real user-id */
88 struct notifier *pidchange = NULL;
89 struct notifier *phasechange = NULL;
90 struct notifier *exitnotify = NULL;
91 struct notifier *sigreceived = NULL;
93 int hungup; /* terminal has been hung up */
94 int privileged; /* we're running as real uid root */
95 int need_holdoff; /* need holdoff period before restarting */
96 int detached; /* have detached from terminal */
97 volatile int status; /* exit status for pppd */
98 int unsuccess; /* # unsuccessful connection attempts */
99 int do_callback; /* != 0 if we should do callback next */
100 int doing_callback; /* != 0 if we are doing callback */
101 int ppp_session_number; /* Session number, for channels with such a
102 concept (eg PPPoE) */
104 TDB_CONTEXT *pppdb; /* database for storing status etc. */
109 int (*holdoff_hook) __P((void)) = NULL;
110 int (*new_phase_hook) __P((int)) = NULL;
111 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
112 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
114 static int conn_running; /* we have a [dis]connector running */
115 static int devfd; /* fd of underlying device */
116 static int fd_ppp = -1; /* fd for talking PPP */
117 static int fd_loop; /* fd for getting demand-dial packets */
119 int phase; /* where the link is at */
128 static sigjmp_buf sigjmp;
130 char **script_env; /* Env. variable values for scripts */
131 int s_env_nalloc; /* # words avail at script_env */
133 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
134 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
136 static int n_children; /* # child processes still running */
137 static int got_sigchld; /* set if we have received a SIGCHLD */
139 int privopen; /* don't lock, open device as root */
141 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
143 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
144 int ngroups; /* How many groups valid in groups */
146 static struct timeval start_time; /* Time when link was started. */
148 struct pppd_stats link_stats;
149 int link_connect_time;
150 int link_stats_valid;
153 * We maintain a list of child process pids and
154 * functions to call when they exit.
159 void (*done) __P((void *));
161 struct subprocess *next;
164 static struct subprocess *children;
166 /* Prototypes for procedures local to this file. */
168 static void setup_signals __P((void));
169 static void create_pidfile __P((void));
170 static void create_linkpidfile __P((void));
171 static void cleanup __P((void));
172 static void get_input __P((void));
173 static void calltimeout __P((void));
174 static struct timeval *timeleft __P((struct timeval *));
175 static void kill_my_pg __P((int));
176 static void hup __P((int));
177 static void term __P((int));
178 static void chld __P((int));
179 static void toggle_debug __P((int));
180 static void open_ccp __P((int));
181 static void bad_signal __P((int));
182 static void holdoff_end __P((void *));
183 static int reap_kids __P((int waitfor));
186 static void update_db_entry __P((void));
187 static void add_db_key __P((const char *));
188 static void delete_db_key __P((const char *));
189 static void cleanup_db __P((void));
192 static void handle_events __P((void));
193 static void print_link_stats __P((void));
195 extern char *ttyname __P((int));
196 extern char *getlogin __P((void));
197 int main __P((int, char *[]));
201 #define O_NONBLOCK O_NDELAY
205 #define setlogmask(x)
209 * PPP Data Link Layer "protocol" table.
210 * One entry per supported protocol.
211 * The last entry must be NULL.
213 struct protent *protocols[] = {
235 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
237 #if !defined(PPP_DRV_NAME)
238 #define PPP_DRV_NAME "ppp"
239 #endif /* !defined(PPP_DRV_NAME) */
249 struct protent *protp;
252 link_stats_valid = 0;
253 new_phase(PHASE_INITIALIZE);
256 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
257 * This way we can close 0, 1, 2 in detach() without clobbering
258 * a fd that we are using.
260 if ((i = open("/dev/null", O_RDWR)) >= 0) {
261 while (0 <= i && i <= 2)
269 /* Initialize syslog facilities */
272 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
273 option_error("Couldn't get hostname: %m");
276 hostname[MAXNAMELEN-1] = 0;
278 /* make sure we don't create world or group writable files. */
279 umask(umask(0777) | 022);
282 privileged = uid == 0;
283 slprintf(numbuf, sizeof(numbuf), "%d", uid);
284 script_setenv("ORIG_UID", numbuf, 0);
286 ngroups = getgroups(NGROUPS_MAX, groups);
289 * Initialize magic number generator now so that protocols may
290 * use magic numbers in initialization.
295 * Initialize each protocol.
297 for (i = 0; (protp = protocols[i]) != NULL; ++i)
301 * Initialize the default channel.
308 * Parse, in order, the system options file, the user's options file,
309 * and the command line arguments.
311 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
312 || !options_from_user()
313 || !parse_args(argc-1, argv+1))
314 exit(EXIT_OPTION_ERROR);
315 devnam_fixed = 1; /* can no longer change device name */
318 * Work out the device name, if it hasn't already been specified,
319 * and parse the tty's options file.
321 if (the_channel->process_extra_options)
322 (*the_channel->process_extra_options)();
325 setlogmask(LOG_UPTO(LOG_DEBUG));
328 * Check that we are running as root.
330 if (geteuid() != 0) {
331 option_error("must be root to run %s, since it is not setuid-root",
336 if (!ppp_available()) {
337 option_error("%s", no_ppp_msg);
338 exit(EXIT_NO_KERNEL_SUPPORT);
342 * Check that the options given are valid and consistent.
345 if (!sys_check_options())
346 exit(EXIT_OPTION_ERROR);
347 auth_check_options();
348 #ifdef HAVE_MULTILINK
351 for (i = 0; (protp = protocols[i]) != NULL; ++i)
352 if (protp->check_options != NULL)
353 (*protp->check_options)();
354 if (the_channel->check_options)
355 (*the_channel->check_options)();
358 if (dump_options || dryrun) {
359 init_pr_log(NULL, LOG_INFO);
360 print_options(pr_log, NULL);
367 * Initialize system-dependent stuff.
372 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
374 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
377 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
379 warn("Warning: disabling multilink");
386 * Detach ourselves from the terminal, if required,
387 * and identify who is running us.
389 if (!nodetach && !updetach)
394 if (pw != NULL && pw->pw_name != NULL)
399 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
400 script_setenv("PPPLOGNAME", p, 0);
403 script_setenv("DEVICE", devnam, 1);
404 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
405 script_setenv("PPPD_PID", numbuf, 1);
411 create_linkpidfile();
414 * If we're doing dial-on-demand, set up the interface now.
418 * Open the loopback channel and set it up to be the ppp interface.
421 tdb_writelock(pppdb);
423 fd_loop = open_ppp_loopback();
426 tdb_writeunlock(pppdb);
429 * Configure the interface and mark it up, etc.
442 doing_callback = do_callback;
445 if (demand && !doing_callback) {
447 * Don't do anything until we see some activity.
449 new_phase(PHASE_DORMANT);
454 if (kill_link && !persist)
456 if (get_loop_output())
460 if (kill_link && !persist)
464 * Now we want to bring up the link.
467 info("Starting link");
470 new_phase(PHASE_SERIALCONN);
472 devfd = the_channel->connect();
476 /* set up the serial device as a ppp interface */
478 tdb_writelock(pppdb);
480 fd_ppp = the_channel->establish_ppp(devfd);
483 tdb_writeunlock(pppdb);
485 status = EXIT_FATAL_ERROR;
489 if (!demand && ifunit >= 0)
492 tdb_writeunlock(pppdb);
496 * Start opening the connection and wait for
497 * incoming events (reply, timeout, etc.).
500 notice("Connect: %s <--> %s", ifname, ppp_devnam);
502 notice("Starting negotiation on %s", ppp_devnam);
503 gettimeofday(&start_time, NULL);
504 script_unsetenv("CONNECT_TIME");
505 script_unsetenv("BYTES_SENT");
506 script_unsetenv("BYTES_RCVD");
510 lcp_open(0); /* Start protocol */
511 status = EXIT_NEGOTIATION_FAILED;
512 new_phase(PHASE_ESTABLISH);
513 while (phase != PHASE_DEAD) {
517 lcp_close(0, "User request");
519 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
520 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
521 (*ccp_protent.open)(0);
529 * Delete pid file before disestablishing ppp. Otherwise it
530 * can happen that another pppd gets the same unit and then
531 * we delete its pid file.
534 if (pidfilename[0] != 0
535 && unlink(pidfilename) < 0 && errno != ENOENT)
536 warn("unable to delete pid file %s: %m", pidfilename);
541 * If we may want to bring the link up again, transfer
542 * the ppp unit back to the loopback. Set the
543 * real serial device back to its normal mode of operation.
547 the_channel->disestablish_ppp(devfd);
552 script_unsetenv("IFNAME");
555 * Run disconnector script, if requested.
556 * XXX we may not be able to do this if the line has hung up!
559 new_phase(PHASE_DISCONNECT);
560 the_channel->disconnect();
563 if (the_channel->cleanup)
564 (*the_channel->cleanup)();
567 if (pidfilename[0] != 0
568 && unlink(pidfilename) < 0 && errno != ENOENT)
569 warn("unable to delete pid file %s: %m", pidfilename);
573 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
578 t = need_holdoff? holdoff: 0;
580 t = (*holdoff_hook)();
582 new_phase(PHASE_HOLDOFF);
583 TIMEOUT(holdoff_end, NULL, t);
587 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
588 } while (phase == PHASE_HOLDOFF);
594 /* Wait for scripts to finish */
595 /* XXX should have a timeout here */
596 while (n_children > 0) {
598 struct subprocess *chp;
599 dbglog("Waiting for %d child processes...", n_children);
600 for (chp = children; chp != NULL; chp = chp->next)
601 dbglog(" script %s, pid %d", chp->prog, chp->pid);
603 if (reap_kids(1) < 0)
612 * handle_events - wait for something to happen and respond to it.
620 kill_link = open_ccp_flag = 0;
621 if (sigsetjmp(sigjmp, 1) == 0) {
622 sigprocmask(SIG_BLOCK, &mask, NULL);
623 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
624 sigprocmask(SIG_UNBLOCK, &mask, NULL);
627 sigprocmask(SIG_UNBLOCK, &mask, NULL);
628 wait_input(timeleft(&timo));
636 if (status != EXIT_HANGUP)
637 status = EXIT_USER_REQUEST;
642 status = EXIT_USER_REQUEST;
646 reap_kids(0); /* Don't leave dead kids lying around */
656 * setup_signals - initialize signal handling.
665 * Compute mask of all interesting signals and install signal handlers
666 * for each. Only one signal handler may be active at a time. Therefore,
667 * all other signals should be masked when any handler is executing.
670 sigaddset(&mask, SIGHUP);
671 sigaddset(&mask, SIGINT);
672 sigaddset(&mask, SIGTERM);
673 sigaddset(&mask, SIGCHLD);
674 sigaddset(&mask, SIGUSR2);
676 #define SIGNAL(s, handler) do { \
677 sa.sa_handler = handler; \
678 if (sigaction(s, &sa, NULL) < 0) \
679 fatal("Couldn't establish signal handler (%d): %m", s); \
684 SIGNAL(SIGHUP, hup); /* Hangup */
685 SIGNAL(SIGINT, term); /* Interrupt */
686 SIGNAL(SIGTERM, term); /* Terminate */
687 SIGNAL(SIGCHLD, chld);
689 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
690 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
693 * Install a handler for other signals which would otherwise
694 * cause pppd to exit without cleaning up.
696 SIGNAL(SIGABRT, bad_signal);
697 SIGNAL(SIGALRM, bad_signal);
698 SIGNAL(SIGFPE, bad_signal);
699 SIGNAL(SIGILL, bad_signal);
700 SIGNAL(SIGPIPE, bad_signal);
701 SIGNAL(SIGQUIT, bad_signal);
702 SIGNAL(SIGSEGV, bad_signal);
704 SIGNAL(SIGBUS, bad_signal);
707 SIGNAL(SIGEMT, bad_signal);
710 SIGNAL(SIGPOLL, bad_signal);
713 SIGNAL(SIGPROF, bad_signal);
716 SIGNAL(SIGSYS, bad_signal);
719 SIGNAL(SIGTRAP, bad_signal);
722 SIGNAL(SIGVTALRM, bad_signal);
725 SIGNAL(SIGXCPU, bad_signal);
728 SIGNAL(SIGXFSZ, bad_signal);
732 * Apparently we can get a SIGPIPE when we call syslog, if
733 * syslogd has died and been restarted. Ignoring it seems
736 signal(SIGPIPE, SIG_IGN);
740 * set_ifunit - do things we need to do once we know which ppp
747 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
748 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
749 script_setenv("IFNAME", ifname, iskey);
751 create_pidfile(); /* write pid to file */
752 create_linkpidfile();
757 * detach - detach us from the controlling terminal.
767 if ((pid = fork()) < 0) {
768 error("Couldn't detach (fork failed: %m)");
769 die(1); /* or just return? */
773 notify(pidchange, pid);
774 exit(0); /* parent dies */
784 /* update pid files if they have been written already */
788 create_linkpidfile();
789 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
790 script_setenv("PPPD_PID", numbuf, 1);
794 * reopen_log - (re)open our connection to syslog.
800 openlog("pppd", LOG_PID);
802 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
803 setlogmask(LOG_UPTO(LOG_INFO));
808 * Create a file containing our process ID.
815 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
816 _PATH_VARRUN, ifname);
817 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
818 fprintf(pidfile, "%d\n", getpid());
819 (void) fclose(pidfile);
821 error("Failed to create pid file %s: %m", pidfilename);
831 if (linkname[0] == 0)
833 script_setenv("LINKNAME", linkname, 1);
834 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
835 _PATH_VARRUN, linkname);
836 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
837 fprintf(pidfile, "%d\n", getpid());
839 fprintf(pidfile, "%s\n", ifname);
840 (void) fclose(pidfile);
842 error("Failed to create pid file %s: %m", linkpidfile);
848 * holdoff_end - called via a timeout when the holdoff period ends.
854 new_phase(PHASE_DORMANT);
857 /* List of protocol names, to make our messages a little more informative. */
858 struct protocol_list {
861 } protocol_list[] = {
863 { 0x23, "OSI Network Layer" },
864 { 0x25, "Xerox NS IDP" },
865 { 0x27, "DECnet Phase IV" },
866 { 0x29, "Appletalk" },
867 { 0x2b, "Novell IPX" },
868 { 0x2d, "VJ compressed TCP/IP" },
869 { 0x2f, "VJ uncompressed TCP/IP" },
870 { 0x31, "Bridging PDU" },
871 { 0x33, "Stream Protocol ST-II" },
872 { 0x35, "Banyan Vines" },
873 { 0x39, "AppleTalk EDDP" },
874 { 0x3b, "AppleTalk SmartBuffered" },
875 { 0x3d, "Multi-Link" },
876 { 0x3f, "NETBIOS Framing" },
877 { 0x41, "Cisco Systems" },
878 { 0x43, "Ascom Timeplex" },
879 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
880 { 0x47, "DCA Remote Lan" },
881 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
882 { 0x4b, "SNA over 802.2" },
884 { 0x4f, "IP6 Header Compression" },
885 { 0x6f, "Stampede Bridging" },
886 { 0xfb, "single-link compression" },
887 { 0xfd, "1st choice compression" },
888 { 0x0201, "802.1d Hello Packets" },
889 { 0x0203, "IBM Source Routing BPDU" },
890 { 0x0205, "DEC LANBridge100 Spanning Tree" },
891 { 0x0231, "Luxcom" },
892 { 0x0233, "Sigma Network Systems" },
893 { 0x8021, "Internet Protocol Control Protocol" },
894 { 0x8023, "OSI Network Layer Control Protocol" },
895 { 0x8025, "Xerox NS IDP Control Protocol" },
896 { 0x8027, "DECnet Phase IV Control Protocol" },
897 { 0x8029, "Appletalk Control Protocol" },
898 { 0x802b, "Novell IPX Control Protocol" },
899 { 0x8031, "Bridging NCP" },
900 { 0x8033, "Stream Protocol Control Protocol" },
901 { 0x8035, "Banyan Vines Control Protocol" },
902 { 0x803d, "Multi-Link Control Protocol" },
903 { 0x803f, "NETBIOS Framing Control Protocol" },
904 { 0x8041, "Cisco Systems Control Protocol" },
905 { 0x8043, "Ascom Timeplex" },
906 { 0x8045, "Fujitsu LBLB Control Protocol" },
907 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
908 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
909 { 0x804b, "SNA over 802.2 Control Protocol" },
910 { 0x804d, "SNA Control Protocol" },
911 { 0x804f, "IP6 Header Compression Control Protocol" },
912 { 0x006f, "Stampede Bridging Control Protocol" },
913 { 0x80fb, "Single Link Compression Control Protocol" },
914 { 0x80fd, "Compression Control Protocol" },
915 { 0xc021, "Link Control Protocol" },
916 { 0xc023, "Password Authentication Protocol" },
917 { 0xc025, "Link Quality Report" },
918 { 0xc027, "Shiva Password Authentication Protocol" },
919 { 0xc029, "CallBack Control Protocol (CBCP)" },
920 { 0xc081, "Container Control Protocol" },
921 { 0xc223, "Challenge Handshake Authentication Protocol" },
922 { 0xc281, "Proprietary Authentication Protocol" },
927 * protocol_name - find a name for a PPP protocol.
933 struct protocol_list *lp;
935 for (lp = protocol_list; lp->proto != 0; ++lp)
936 if (proto == lp->proto)
942 * get_input - called when incoming data is available.
950 struct protent *protp;
952 p = inpacket_buf; /* point to beginning of packet buffer */
954 len = read_packet(inpacket_buf);
959 notice("Modem hangup");
961 status = EXIT_HANGUP;
962 lcp_lowerdown(0); /* serial link is no longer available */
967 if (len < PPP_HDRLEN) {
968 dbglog("received short packet:%.*B", len, p);
972 dump_packet("rcvd", p, len);
973 if (snoop_recv_hook) snoop_recv_hook(p, len);
975 p += 2; /* Skip address and control */
976 GETSHORT(protocol, p);
980 * Toss all non-LCP packets unless LCP is OPEN.
982 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
983 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
988 * Until we get past the authentication phase, toss all packets
989 * except LCP, LQR and authentication packets.
991 if (phase <= PHASE_AUTHENTICATE
992 && !(protocol == PPP_LCP || protocol == PPP_LQR
993 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
994 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
1000 * Upcall the proper protocol input routine.
1002 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1003 if (protp->protocol == protocol && protp->enabled_flag) {
1004 (*protp->input)(0, p, len);
1007 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1008 && protp->datainput != NULL) {
1009 (*protp->datainput)(0, p, len);
1015 const char *pname = protocol_name(protocol);
1017 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1019 warn("Unsupported protocol 0x%x received", protocol);
1021 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1025 * new_phase - signal the start of a new phase of pppd's operation.
1033 (*new_phase_hook)(p);
1034 notify(phasechange, p);
1038 * die - clean up state and exit with the specified status.
1046 notify(exitnotify, status);
1047 syslog(LOG_INFO, "Exit.");
1052 * cleanup - restore anything which needs to be restored before we exit
1061 the_channel->disestablish_ppp(devfd);
1062 if (the_channel->cleanup)
1063 (*the_channel->cleanup)();
1065 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1066 warn("unable to delete pid file %s: %m", pidfilename);
1068 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1069 warn("unable to delete pid file %s: %m", linkpidfile);
1083 * Print connect time and statistics.
1085 if (link_stats_valid) {
1086 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1087 info("Connect time %d.%d minutes.", t/10, t%10);
1088 info("Sent %u bytes, received %u bytes.",
1089 link_stats.bytes_out, link_stats.bytes_in);
1094 * update_link_stats - get stats at link termination.
1097 update_link_stats(u)
1103 if (!get_ppp_stats(u, &link_stats)
1104 || gettimeofday(&now, NULL) < 0)
1106 link_connect_time = now.tv_sec - start_time.tv_sec;
1107 link_stats_valid = 1;
1109 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1110 script_setenv("CONNECT_TIME", numbuf, 0);
1111 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1112 script_setenv("BYTES_SENT", numbuf, 0);
1113 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1114 script_setenv("BYTES_RCVD", numbuf, 0);
1119 struct timeval c_time; /* time at which to call routine */
1120 void *c_arg; /* argument to routine */
1121 void (*c_func) __P((void *)); /* routine */
1122 struct callout *c_next;
1125 static struct callout *callout = NULL; /* Callout list */
1126 static struct timeval timenow; /* Current time */
1129 * timeout - Schedule a timeout.
1132 timeout(func, arg, secs, usecs)
1133 void (*func) __P((void *));
1137 struct callout *newp, *p, **pp;
1139 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1145 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1146 fatal("Out of memory in timeout()!");
1148 newp->c_func = func;
1149 gettimeofday(&timenow, NULL);
1150 newp->c_time.tv_sec = timenow.tv_sec + secs;
1151 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1152 if (newp->c_time.tv_usec >= 1000000) {
1153 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1154 newp->c_time.tv_usec %= 1000000;
1158 * Find correct place and link it in.
1160 for (pp = &callout; (p = *pp); pp = &p->c_next)
1161 if (newp->c_time.tv_sec < p->c_time.tv_sec
1162 || (newp->c_time.tv_sec == p->c_time.tv_sec
1163 && newp->c_time.tv_usec < p->c_time.tv_usec))
1171 * untimeout - Unschedule a timeout.
1174 untimeout(func, arg)
1175 void (*func) __P((void *));
1178 struct callout **copp, *freep;
1180 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1183 * Find first matching timeout and remove it from the list.
1185 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1186 if (freep->c_func == func && freep->c_arg == arg) {
1187 *copp = freep->c_next;
1188 free((char *) freep);
1195 * calltimeout - Call any timeout routines which are now due.
1202 while (callout != NULL) {
1205 if (gettimeofday(&timenow, NULL) < 0)
1206 fatal("Failed to get time of day: %m");
1207 if (!(p->c_time.tv_sec < timenow.tv_sec
1208 || (p->c_time.tv_sec == timenow.tv_sec
1209 && p->c_time.tv_usec <= timenow.tv_usec)))
1210 break; /* no, it's not time yet */
1212 callout = p->c_next;
1213 (*p->c_func)(p->c_arg);
1221 * timeleft - return the length of time until the next timeout is due.
1223 static struct timeval *
1225 struct timeval *tvp;
1227 if (callout == NULL)
1230 gettimeofday(&timenow, NULL);
1231 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1232 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1233 if (tvp->tv_usec < 0) {
1234 tvp->tv_usec += 1000000;
1237 if (tvp->tv_sec < 0)
1238 tvp->tv_sec = tvp->tv_usec = 0;
1245 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1251 struct sigaction act, oldact;
1253 act.sa_handler = SIG_IGN;
1256 sigaction(sig, &act, &oldact);
1257 sigaction(sig, &oldact, NULL);
1262 * hup - Catch SIGHUP signal.
1264 * Indicates that the physical layer has been disconnected.
1265 * We don't rely on this indication; if the user has sent this
1266 * signal, we just take the link down.
1272 info("Hangup (SIGHUP)");
1275 /* Send the signal to the [dis]connector process(es) also */
1277 notify(sigreceived, sig);
1279 siglongjmp(sigjmp, 1);
1284 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1286 * Indicates that we should initiate a graceful disconnect and exit.
1293 info("Terminating on signal %d.", sig);
1296 /* Send the signal to the [dis]connector process(es) also */
1298 notify(sigreceived, sig);
1300 siglongjmp(sigjmp, 1);
1305 * chld - Catch SIGCHLD signal.
1306 * Sets a flag so we will call reap_kids in the mainline.
1314 siglongjmp(sigjmp, 1);
1319 * toggle_debug - Catch SIGUSR1 signal.
1321 * Toggle debug flag.
1330 setlogmask(LOG_UPTO(LOG_DEBUG));
1332 setlogmask(LOG_UPTO(LOG_WARNING));
1338 * open_ccp - Catch SIGUSR2 signal.
1340 * Try to (re)negotiate compression.
1349 siglongjmp(sigjmp, 1);
1354 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1360 static int crashed = 0;
1365 error("Fatal signal %d", sig);
1367 kill_my_pg(SIGTERM);
1368 notify(sigreceived, sig);
1374 * device_script - run a program to talk to the specified fds
1375 * (e.g. to run the connector or disconnector script).
1376 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1379 device_script(program, in, out, dont_wait)
1393 error("Failed to create child process: %m");
1399 record_child(pid, program, NULL, NULL);
1402 while (waitpid(pid, &status, 0) < 0) {
1405 fatal("error waiting for (dis)connection process: %m");
1409 return (status == 0 ? 0 : -1);
1412 /* here we are executing in the child */
1413 /* make sure fds 0, 1, 2 are occupied */
1414 while ((fd = dup(in)) >= 0) {
1421 /* dup in and out to fds > 2 */
1424 if (log_to_fd >= 0) {
1425 errfd = dup(log_to_fd);
1427 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1430 /* close fds 0 - 2 and any others we can think of */
1435 if (the_channel->close)
1436 (*the_channel->close)();
1439 /* dup the in, out, err fds to 0, 1, 2 */
1450 if (getuid() != uid) {
1451 error("setuid failed");
1455 execl("/bin/sh", "sh", "-c", program, (char *)0);
1456 error("could not exec /bin/sh: %m");
1463 * run-program - execute a program with given arguments,
1464 * but don't wait for it.
1465 * If the program can't be executed, logs an error unless
1466 * must_exist is 0 and the program file doesn't exist.
1467 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1468 * or isn't an executable plain file, or the process ID of the child.
1469 * If done != NULL, (*done)(arg) will be called later (within
1470 * reap_kids) iff the return value is > 0.
1473 run_program(prog, args, must_exist, done, arg)
1477 void (*done) __P((void *));
1484 * First check if the file exists and is executable.
1485 * We don't use access() because that would use the
1486 * real user-id, which might not be root, and the script
1487 * might be accessible only to root.
1490 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1491 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1492 if (must_exist || errno != ENOENT)
1493 warn("Can't execute %s: %m", prog);
1499 error("Failed to create child process for %s: %m", prog);
1505 /* Leave the current location */
1506 (void) setsid(); /* No controlling tty. */
1507 (void) umask (S_IRWXG|S_IRWXO);
1508 (void) chdir ("/"); /* no current directory. */
1509 setuid(0); /* set real UID = root */
1512 /* Ensure that nothing of our device environment is inherited. */
1518 if (the_channel->close)
1519 (*the_channel->close)();
1521 /* Don't pass handles to the PPP device, even by accident. */
1522 new_fd = open (_PATH_DEVNULL, O_RDWR);
1525 dup2 (new_fd, 0); /* stdin <- /dev/null */
1528 dup2 (0, 1); /* stdout -> /dev/null */
1529 dup2 (0, 2); /* stderr -> /dev/null */
1533 /* Force the priority back to zero if pppd is running higher. */
1534 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1535 warn("can't reset priority to 0: %m");
1538 /* SysV recommends a second fork at this point. */
1540 /* run the program */
1541 execve(prog, args, script_env);
1542 if (must_exist || errno != ENOENT) {
1543 /* have to reopen the log, there's nowhere else
1544 for the message to go. */
1546 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1553 dbglog("Script %s started (pid %d)", prog, pid);
1554 record_child(pid, prog, done, arg);
1561 * record_child - add a child process to the list for reap_kids
1565 record_child(pid, prog, done, arg)
1568 void (*done) __P((void *));
1571 struct subprocess *chp;
1575 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1577 warn("losing track of %s process", prog);
1583 chp->next = children;
1590 * reap_kids - get status from any dead child processes,
1591 * and log a message for abnormal terminations.
1598 struct subprocess *chp, **prevp;
1600 if (n_children == 0)
1602 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1604 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1605 if (chp->pid == pid) {
1611 if (WIFSIGNALED(status)) {
1612 warn("Child process %s (pid %d) terminated with signal %d",
1613 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1615 dbglog("Script %s finished (pid %d), status = 0x%x",
1616 (chp? chp->prog: "??"), pid,
1617 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1618 if (chp && chp->done)
1619 (*chp->done)(chp->arg);
1624 if (errno == ECHILD)
1627 error("Error waiting for child process: %m");
1633 * add_notifier - add a new function to be called when something happens.
1636 add_notifier(notif, func, arg)
1637 struct notifier **notif;
1641 struct notifier *np;
1643 np = malloc(sizeof(struct notifier));
1645 novm("notifier struct");
1653 * remove_notifier - remove a function from the list of things to
1654 * be called when something happens.
1657 remove_notifier(notif, func, arg)
1658 struct notifier **notif;
1662 struct notifier *np;
1664 for (; (np = *notif) != 0; notif = &np->next) {
1665 if (np->func == func && np->arg == arg) {
1674 * notify - call a set of functions registered with add_notify.
1678 struct notifier *notif;
1681 struct notifier *np;
1683 while ((np = notif) != 0) {
1685 (*np->func)(np->arg, val);
1690 * novm - log an error message saying we ran out of memory, and die.
1696 fatal("Virtual memory exhausted allocating %s\n", msg);
1700 * script_setenv - set an environment variable value to be used
1701 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1704 script_setenv(var, value, iskey)
1708 size_t varl = strlen(var);
1709 size_t vl = varl + strlen(value) + 2;
1711 char *p, *newstring;
1713 newstring = (char *) malloc(vl+1);
1716 *newstring++ = iskey;
1717 slprintf(newstring, vl, "%s=%s", var, value);
1719 /* check if this variable is already set */
1720 if (script_env != 0) {
1721 for (i = 0; (p = script_env[i]) != 0; ++i) {
1722 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1724 if (p[-1] && pppdb != NULL)
1728 script_env[i] = newstring;
1730 if (iskey && pppdb != NULL)
1731 add_db_key(newstring);
1738 /* no space allocated for script env. ptrs. yet */
1740 script_env = (char **) malloc(16 * sizeof(char *));
1741 if (script_env == 0)
1746 /* reallocate script_env with more space if needed */
1747 if (i + 1 >= s_env_nalloc) {
1749 char **newenv = (char **) realloc((void *)script_env,
1750 new_n * sizeof(char *));
1753 script_env = newenv;
1754 s_env_nalloc = new_n;
1757 script_env[i] = newstring;
1758 script_env[i+1] = 0;
1761 if (pppdb != NULL) {
1763 add_db_key(newstring);
1770 * script_unsetenv - remove a variable from the environment
1774 script_unsetenv(var)
1777 int vl = strlen(var);
1781 if (script_env == 0)
1783 for (i = 0; (p = script_env[i]) != 0; ++i) {
1784 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1786 if (p[-1] && pppdb != NULL)
1790 while ((script_env[i] = script_env[i+1]) != 0)
1803 * update_db_entry - update our entry in the database.
1812 if (script_env == NULL)
1815 for (i = 0; (p = script_env[i]) != 0; ++i)
1816 vlen += strlen(p) + 1;
1817 vbuf = malloc(vlen);
1819 novm("database entry");
1821 for (i = 0; (p = script_env[i]) != 0; ++i)
1822 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1825 key.dsize = strlen(db_key);
1828 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1829 error("tdb_store failed: %s", tdb_error(pppdb));
1837 * add_db_key - add a key that we can use to look up our database entry.
1845 key.dptr = (char *) str;
1846 key.dsize = strlen(str);
1848 dbuf.dsize = strlen(db_key);
1849 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1850 error("tdb_store key failed: %s", tdb_error(pppdb));
1854 * delete_db_key - delete a key for looking up our database entry.
1862 key.dptr = (char *) str;
1863 key.dsize = strlen(str);
1864 tdb_delete(pppdb, key);
1868 * cleanup_db - delete all the entries we put in the database.
1878 key.dsize = strlen(db_key);
1879 tdb_delete(pppdb, key);
1880 for (i = 0; (p = script_env[i]) != 0; ++i)
1884 #endif /* USE_TDB */