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 1.117 2002/10/27 12:04:07 fcusack 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>
57 #include "pathnames.h"
69 #endif /* IPX_CHANGE */
74 static const char rcsid[] = RCSID;
77 char ifname[32]; /* Interface name */
78 int ifunit; /* Interface unit number */
80 struct channel *the_channel;
82 char *progname; /* Name of this program */
83 char hostname[MAXNAMELEN]; /* Our hostname */
84 static char pidfilename[MAXPATHLEN]; /* name of pid file */
85 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
86 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
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[] = {
236 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
238 #if !defined(PPP_DRV_NAME)
239 #define PPP_DRV_NAME "ppp"
240 #endif /* !defined(PPP_DRV_NAME) */
250 struct protent *protp;
253 link_stats_valid = 0;
254 new_phase(PHASE_INITIALIZE);
257 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
258 * This way we can close 0, 1, 2 in detach() without clobbering
259 * a fd that we are using.
261 if ((i = open("/dev/null", O_RDWR)) >= 0) {
262 while (0 <= i && i <= 2)
270 /* Initialize syslog facilities */
273 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
274 option_error("Couldn't get hostname: %m");
277 hostname[MAXNAMELEN-1] = 0;
279 /* make sure we don't create world or group writable files. */
280 umask(umask(0777) | 022);
283 privileged = uid == 0;
284 slprintf(numbuf, sizeof(numbuf), "%d", uid);
285 script_setenv("ORIG_UID", numbuf, 0);
287 ngroups = getgroups(NGROUPS_MAX, groups);
290 * Initialize magic number generator now so that protocols may
291 * use magic numbers in initialization.
296 * Initialize each protocol.
298 for (i = 0; (protp = protocols[i]) != NULL; ++i)
302 * Initialize the default channel.
309 * Parse, in order, the system options file, the user's options file,
310 * and the command line arguments.
312 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
313 || !options_from_user()
314 || !parse_args(argc-1, argv+1))
315 exit(EXIT_OPTION_ERROR);
316 devnam_fixed = 1; /* can no longer change device name */
319 * Work out the device name, if it hasn't already been specified,
320 * and parse the tty's options file.
322 if (the_channel->process_extra_options)
323 (*the_channel->process_extra_options)();
326 setlogmask(LOG_UPTO(LOG_DEBUG));
329 * Check that we are running as root.
331 if (geteuid() != 0) {
332 option_error("must be root to run %s, since it is not setuid-root",
337 if (!ppp_available()) {
338 option_error("%s", no_ppp_msg);
339 exit(EXIT_NO_KERNEL_SUPPORT);
343 * Check that the options given are valid and consistent.
346 if (!sys_check_options())
347 exit(EXIT_OPTION_ERROR);
348 auth_check_options();
349 #ifdef HAVE_MULTILINK
352 for (i = 0; (protp = protocols[i]) != NULL; ++i)
353 if (protp->check_options != NULL)
354 (*protp->check_options)();
355 if (the_channel->check_options)
356 (*the_channel->check_options)();
359 if (dump_options || dryrun) {
360 init_pr_log(NULL, LOG_INFO);
361 print_options(pr_log, NULL);
366 * Early check for remote number authorization.
368 if (!auth_number()) {
369 warn("calling number %q is not authorized", remote_number);
370 exit(EXIT_CNID_AUTH_FAILED);
377 * Initialize system-dependent stuff.
382 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
384 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
387 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
389 warn("Warning: disabling multilink");
396 * Detach ourselves from the terminal, if required,
397 * and identify who is running us.
399 if (!nodetach && !updetach)
404 if (pw != NULL && pw->pw_name != NULL)
409 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
410 script_setenv("PPPLOGNAME", p, 0);
413 script_setenv("DEVICE", devnam, 1);
414 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
415 script_setenv("PPPD_PID", numbuf, 1);
421 create_linkpidfile();
424 * If we're doing dial-on-demand, set up the interface now.
428 * Open the loopback channel and set it up to be the ppp interface.
431 tdb_writelock(pppdb);
433 fd_loop = open_ppp_loopback();
436 tdb_writeunlock(pppdb);
439 * Configure the interface and mark it up, etc.
452 doing_callback = do_callback;
455 if (demand && !doing_callback) {
457 * Don't do anything until we see some activity.
459 new_phase(PHASE_DORMANT);
464 if (kill_link && !persist)
466 if (get_loop_output())
470 if (kill_link && !persist)
474 * Now we want to bring up the link.
477 info("Starting link");
480 new_phase(PHASE_SERIALCONN);
482 devfd = the_channel->connect();
486 /* set up the serial device as a ppp interface */
488 tdb_writelock(pppdb);
490 fd_ppp = the_channel->establish_ppp(devfd);
493 tdb_writeunlock(pppdb);
495 status = EXIT_FATAL_ERROR;
499 if (!demand && ifunit >= 0)
502 tdb_writeunlock(pppdb);
506 * Start opening the connection and wait for
507 * incoming events (reply, timeout, etc.).
510 notice("Connect: %s <--> %s", ifname, ppp_devnam);
512 notice("Starting negotiation on %s", ppp_devnam);
513 gettimeofday(&start_time, NULL);
514 script_unsetenv("CONNECT_TIME");
515 script_unsetenv("BYTES_SENT");
516 script_unsetenv("BYTES_RCVD");
520 lcp_open(0); /* Start protocol */
521 status = EXIT_NEGOTIATION_FAILED;
522 new_phase(PHASE_ESTABLISH);
523 while (phase != PHASE_DEAD) {
527 lcp_close(0, "User request");
529 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
530 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
531 (*ccp_protent.open)(0);
539 * Delete pid file before disestablishing ppp. Otherwise it
540 * can happen that another pppd gets the same unit and then
541 * we delete its pid file.
544 if (pidfilename[0] != 0
545 && unlink(pidfilename) < 0 && errno != ENOENT)
546 warn("unable to delete pid file %s: %m", pidfilename);
551 * If we may want to bring the link up again, transfer
552 * the ppp unit back to the loopback. Set the
553 * real serial device back to its normal mode of operation.
557 the_channel->disestablish_ppp(devfd);
562 script_unsetenv("IFNAME");
565 * Run disconnector script, if requested.
566 * XXX we may not be able to do this if the line has hung up!
569 new_phase(PHASE_DISCONNECT);
570 the_channel->disconnect();
573 if (the_channel->cleanup)
574 (*the_channel->cleanup)();
577 if (pidfilename[0] != 0
578 && unlink(pidfilename) < 0 && errno != ENOENT)
579 warn("unable to delete pid file %s: %m", pidfilename);
583 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
588 t = need_holdoff? holdoff: 0;
590 t = (*holdoff_hook)();
592 new_phase(PHASE_HOLDOFF);
593 TIMEOUT(holdoff_end, NULL, t);
597 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
598 } while (phase == PHASE_HOLDOFF);
604 /* Wait for scripts to finish */
605 /* XXX should have a timeout here */
606 while (n_children > 0) {
608 struct subprocess *chp;
609 dbglog("Waiting for %d child processes...", n_children);
610 for (chp = children; chp != NULL; chp = chp->next)
611 dbglog(" script %s, pid %d", chp->prog, chp->pid);
613 if (reap_kids(1) < 0)
622 * handle_events - wait for something to happen and respond to it.
630 kill_link = open_ccp_flag = 0;
631 if (sigsetjmp(sigjmp, 1) == 0) {
632 sigprocmask(SIG_BLOCK, &mask, NULL);
633 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
634 sigprocmask(SIG_UNBLOCK, &mask, NULL);
637 sigprocmask(SIG_UNBLOCK, &mask, NULL);
638 wait_input(timeleft(&timo));
646 if (status != EXIT_HANGUP)
647 status = EXIT_USER_REQUEST;
652 status = EXIT_USER_REQUEST;
656 reap_kids(0); /* Don't leave dead kids lying around */
666 * setup_signals - initialize signal handling.
675 * Compute mask of all interesting signals and install signal handlers
676 * for each. Only one signal handler may be active at a time. Therefore,
677 * all other signals should be masked when any handler is executing.
680 sigaddset(&mask, SIGHUP);
681 sigaddset(&mask, SIGINT);
682 sigaddset(&mask, SIGTERM);
683 sigaddset(&mask, SIGCHLD);
684 sigaddset(&mask, SIGUSR2);
686 #define SIGNAL(s, handler) do { \
687 sa.sa_handler = handler; \
688 if (sigaction(s, &sa, NULL) < 0) \
689 fatal("Couldn't establish signal handler (%d): %m", s); \
694 SIGNAL(SIGHUP, hup); /* Hangup */
695 SIGNAL(SIGINT, term); /* Interrupt */
696 SIGNAL(SIGTERM, term); /* Terminate */
697 SIGNAL(SIGCHLD, chld);
699 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
700 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
703 * Install a handler for other signals which would otherwise
704 * cause pppd to exit without cleaning up.
706 SIGNAL(SIGABRT, bad_signal);
707 SIGNAL(SIGALRM, bad_signal);
708 SIGNAL(SIGFPE, bad_signal);
709 SIGNAL(SIGILL, bad_signal);
710 SIGNAL(SIGPIPE, bad_signal);
711 SIGNAL(SIGQUIT, bad_signal);
712 SIGNAL(SIGSEGV, bad_signal);
714 SIGNAL(SIGBUS, bad_signal);
717 SIGNAL(SIGEMT, bad_signal);
720 SIGNAL(SIGPOLL, bad_signal);
723 SIGNAL(SIGPROF, bad_signal);
726 SIGNAL(SIGSYS, bad_signal);
729 SIGNAL(SIGTRAP, bad_signal);
732 SIGNAL(SIGVTALRM, bad_signal);
735 SIGNAL(SIGXCPU, bad_signal);
738 SIGNAL(SIGXFSZ, bad_signal);
742 * Apparently we can get a SIGPIPE when we call syslog, if
743 * syslogd has died and been restarted. Ignoring it seems
746 signal(SIGPIPE, SIG_IGN);
750 * set_ifunit - do things we need to do once we know which ppp
757 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
758 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
759 script_setenv("IFNAME", ifname, iskey);
761 create_pidfile(); /* write pid to file */
762 create_linkpidfile();
767 * detach - detach us from the controlling terminal.
777 if ((pid = fork()) < 0) {
778 error("Couldn't detach (fork failed: %m)");
779 die(1); /* or just return? */
783 notify(pidchange, pid);
784 exit(0); /* parent dies */
794 /* update pid files if they have been written already */
798 create_linkpidfile();
799 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
800 script_setenv("PPPD_PID", numbuf, 1);
804 * reopen_log - (re)open our connection to syslog.
810 openlog("pppd", LOG_PID);
812 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
813 setlogmask(LOG_UPTO(LOG_INFO));
818 * Create a file containing our process ID.
825 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
826 _PATH_VARRUN, ifname);
827 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
828 fprintf(pidfile, "%d\n", getpid());
829 (void) fclose(pidfile);
831 error("Failed to create pid file %s: %m", pidfilename);
841 if (linkname[0] == 0)
843 script_setenv("LINKNAME", linkname, 1);
844 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
845 _PATH_VARRUN, linkname);
846 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
847 fprintf(pidfile, "%d\n", getpid());
849 fprintf(pidfile, "%s\n", ifname);
850 (void) fclose(pidfile);
852 error("Failed to create pid file %s: %m", linkpidfile);
858 * holdoff_end - called via a timeout when the holdoff period ends.
864 new_phase(PHASE_DORMANT);
867 /* List of protocol names, to make our messages a little more informative. */
868 struct protocol_list {
871 } protocol_list[] = {
873 { 0x23, "OSI Network Layer" },
874 { 0x25, "Xerox NS IDP" },
875 { 0x27, "DECnet Phase IV" },
876 { 0x29, "Appletalk" },
877 { 0x2b, "Novell IPX" },
878 { 0x2d, "VJ compressed TCP/IP" },
879 { 0x2f, "VJ uncompressed TCP/IP" },
880 { 0x31, "Bridging PDU" },
881 { 0x33, "Stream Protocol ST-II" },
882 { 0x35, "Banyan Vines" },
883 { 0x39, "AppleTalk EDDP" },
884 { 0x3b, "AppleTalk SmartBuffered" },
885 { 0x3d, "Multi-Link" },
886 { 0x3f, "NETBIOS Framing" },
887 { 0x41, "Cisco Systems" },
888 { 0x43, "Ascom Timeplex" },
889 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
890 { 0x47, "DCA Remote Lan" },
891 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
892 { 0x4b, "SNA over 802.2" },
894 { 0x4f, "IP6 Header Compression" },
895 { 0x6f, "Stampede Bridging" },
896 { 0xfb, "single-link compression" },
897 { 0xfd, "1st choice compression" },
898 { 0x0201, "802.1d Hello Packets" },
899 { 0x0203, "IBM Source Routing BPDU" },
900 { 0x0205, "DEC LANBridge100 Spanning Tree" },
901 { 0x0231, "Luxcom" },
902 { 0x0233, "Sigma Network Systems" },
903 { 0x8021, "Internet Protocol Control Protocol" },
904 { 0x8023, "OSI Network Layer Control Protocol" },
905 { 0x8025, "Xerox NS IDP Control Protocol" },
906 { 0x8027, "DECnet Phase IV Control Protocol" },
907 { 0x8029, "Appletalk Control Protocol" },
908 { 0x802b, "Novell IPX Control Protocol" },
909 { 0x8031, "Bridging NCP" },
910 { 0x8033, "Stream Protocol Control Protocol" },
911 { 0x8035, "Banyan Vines Control Protocol" },
912 { 0x803d, "Multi-Link Control Protocol" },
913 { 0x803f, "NETBIOS Framing Control Protocol" },
914 { 0x8041, "Cisco Systems Control Protocol" },
915 { 0x8043, "Ascom Timeplex" },
916 { 0x8045, "Fujitsu LBLB Control Protocol" },
917 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
918 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
919 { 0x804b, "SNA over 802.2 Control Protocol" },
920 { 0x804d, "SNA Control Protocol" },
921 { 0x804f, "IP6 Header Compression Control Protocol" },
922 { 0x006f, "Stampede Bridging Control Protocol" },
923 { 0x80fb, "Single Link Compression Control Protocol" },
924 { 0x80fd, "Compression Control Protocol" },
925 { 0xc021, "Link Control Protocol" },
926 { 0xc023, "Password Authentication Protocol" },
927 { 0xc025, "Link Quality Report" },
928 { 0xc027, "Shiva Password Authentication Protocol" },
929 { 0xc029, "CallBack Control Protocol (CBCP)" },
930 { 0xc081, "Container Control Protocol" },
931 { 0xc223, "Challenge Handshake Authentication Protocol" },
932 { 0xc281, "Proprietary Authentication Protocol" },
937 * protocol_name - find a name for a PPP protocol.
943 struct protocol_list *lp;
945 for (lp = protocol_list; lp->proto != 0; ++lp)
946 if (proto == lp->proto)
952 * get_input - called when incoming data is available.
960 struct protent *protp;
962 p = inpacket_buf; /* point to beginning of packet buffer */
964 len = read_packet(inpacket_buf);
969 notice("Modem hangup");
971 status = EXIT_HANGUP;
972 lcp_lowerdown(0); /* serial link is no longer available */
977 if (len < PPP_HDRLEN) {
978 dbglog("received short packet:%.*B", len, p);
982 dump_packet("rcvd", p, len);
983 if (snoop_recv_hook) snoop_recv_hook(p, len);
985 p += 2; /* Skip address and control */
986 GETSHORT(protocol, p);
990 * Toss all non-LCP packets unless LCP is OPEN.
992 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
993 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
998 * Until we get past the authentication phase, toss all packets
999 * except LCP, LQR and authentication packets.
1001 if (phase <= PHASE_AUTHENTICATE
1002 && !(protocol == PPP_LCP || protocol == PPP_LQR
1003 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
1004 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
1010 * Upcall the proper protocol input routine.
1012 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1013 if (protp->protocol == protocol && protp->enabled_flag) {
1014 (*protp->input)(0, p, len);
1017 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1018 && protp->datainput != NULL) {
1019 (*protp->datainput)(0, p, len);
1025 const char *pname = protocol_name(protocol);
1027 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1029 warn("Unsupported protocol 0x%x received", protocol);
1031 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1035 * new_phase - signal the start of a new phase of pppd's operation.
1043 (*new_phase_hook)(p);
1044 notify(phasechange, p);
1048 * die - clean up state and exit with the specified status.
1056 notify(exitnotify, status);
1057 syslog(LOG_INFO, "Exit.");
1062 * cleanup - restore anything which needs to be restored before we exit
1071 the_channel->disestablish_ppp(devfd);
1072 if (the_channel->cleanup)
1073 (*the_channel->cleanup)();
1075 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1076 warn("unable to delete pid file %s: %m", pidfilename);
1078 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1079 warn("unable to delete pid file %s: %m", linkpidfile);
1093 * Print connect time and statistics.
1095 if (link_stats_valid) {
1096 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1097 info("Connect time %d.%d minutes.", t/10, t%10);
1098 info("Sent %u bytes, received %u bytes.",
1099 link_stats.bytes_out, link_stats.bytes_in);
1104 * update_link_stats - get stats at link termination.
1107 update_link_stats(u)
1113 if (!get_ppp_stats(u, &link_stats)
1114 || gettimeofday(&now, NULL) < 0)
1116 link_connect_time = now.tv_sec - start_time.tv_sec;
1117 link_stats_valid = 1;
1119 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1120 script_setenv("CONNECT_TIME", numbuf, 0);
1121 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1122 script_setenv("BYTES_SENT", numbuf, 0);
1123 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1124 script_setenv("BYTES_RCVD", numbuf, 0);
1129 struct timeval c_time; /* time at which to call routine */
1130 void *c_arg; /* argument to routine */
1131 void (*c_func) __P((void *)); /* routine */
1132 struct callout *c_next;
1135 static struct callout *callout = NULL; /* Callout list */
1136 static struct timeval timenow; /* Current time */
1139 * timeout - Schedule a timeout.
1142 timeout(func, arg, secs, usecs)
1143 void (*func) __P((void *));
1147 struct callout *newp, *p, **pp;
1149 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1155 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1156 fatal("Out of memory in timeout()!");
1158 newp->c_func = func;
1159 gettimeofday(&timenow, NULL);
1160 newp->c_time.tv_sec = timenow.tv_sec + secs;
1161 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1162 if (newp->c_time.tv_usec >= 1000000) {
1163 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1164 newp->c_time.tv_usec %= 1000000;
1168 * Find correct place and link it in.
1170 for (pp = &callout; (p = *pp); pp = &p->c_next)
1171 if (newp->c_time.tv_sec < p->c_time.tv_sec
1172 || (newp->c_time.tv_sec == p->c_time.tv_sec
1173 && newp->c_time.tv_usec < p->c_time.tv_usec))
1181 * untimeout - Unschedule a timeout.
1184 untimeout(func, arg)
1185 void (*func) __P((void *));
1188 struct callout **copp, *freep;
1190 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1193 * Find first matching timeout and remove it from the list.
1195 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1196 if (freep->c_func == func && freep->c_arg == arg) {
1197 *copp = freep->c_next;
1198 free((char *) freep);
1205 * calltimeout - Call any timeout routines which are now due.
1212 while (callout != NULL) {
1215 if (gettimeofday(&timenow, NULL) < 0)
1216 fatal("Failed to get time of day: %m");
1217 if (!(p->c_time.tv_sec < timenow.tv_sec
1218 || (p->c_time.tv_sec == timenow.tv_sec
1219 && p->c_time.tv_usec <= timenow.tv_usec)))
1220 break; /* no, it's not time yet */
1222 callout = p->c_next;
1223 (*p->c_func)(p->c_arg);
1231 * timeleft - return the length of time until the next timeout is due.
1233 static struct timeval *
1235 struct timeval *tvp;
1237 if (callout == NULL)
1240 gettimeofday(&timenow, NULL);
1241 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1242 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1243 if (tvp->tv_usec < 0) {
1244 tvp->tv_usec += 1000000;
1247 if (tvp->tv_sec < 0)
1248 tvp->tv_sec = tvp->tv_usec = 0;
1255 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1261 struct sigaction act, oldact;
1263 act.sa_handler = SIG_IGN;
1266 sigaction(sig, &act, &oldact);
1267 sigaction(sig, &oldact, NULL);
1272 * hup - Catch SIGHUP signal.
1274 * Indicates that the physical layer has been disconnected.
1275 * We don't rely on this indication; if the user has sent this
1276 * signal, we just take the link down.
1282 info("Hangup (SIGHUP)");
1285 /* Send the signal to the [dis]connector process(es) also */
1287 notify(sigreceived, sig);
1289 siglongjmp(sigjmp, 1);
1294 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1296 * Indicates that we should initiate a graceful disconnect and exit.
1303 info("Terminating on signal %d.", sig);
1306 /* Send the signal to the [dis]connector process(es) also */
1308 notify(sigreceived, sig);
1310 siglongjmp(sigjmp, 1);
1315 * chld - Catch SIGCHLD signal.
1316 * Sets a flag so we will call reap_kids in the mainline.
1324 siglongjmp(sigjmp, 1);
1329 * toggle_debug - Catch SIGUSR1 signal.
1331 * Toggle debug flag.
1340 setlogmask(LOG_UPTO(LOG_DEBUG));
1342 setlogmask(LOG_UPTO(LOG_WARNING));
1348 * open_ccp - Catch SIGUSR2 signal.
1350 * Try to (re)negotiate compression.
1359 siglongjmp(sigjmp, 1);
1364 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1370 static int crashed = 0;
1375 error("Fatal signal %d", sig);
1377 kill_my_pg(SIGTERM);
1378 notify(sigreceived, sig);
1384 * device_script - run a program to talk to the specified fds
1385 * (e.g. to run the connector or disconnector script).
1386 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1389 device_script(program, in, out, dont_wait)
1403 error("Failed to create child process: %m");
1409 record_child(pid, program, NULL, NULL);
1412 while (waitpid(pid, &status, 0) < 0) {
1415 fatal("error waiting for (dis)connection process: %m");
1419 return (status == 0 ? 0 : -1);
1422 /* here we are executing in the child */
1423 /* make sure fds 0, 1, 2 are occupied */
1424 while ((fd = dup(in)) >= 0) {
1431 /* dup in and out to fds > 2 */
1434 if (log_to_fd >= 0) {
1435 errfd = dup(log_to_fd);
1437 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1440 /* close fds 0 - 2 and any others we can think of */
1445 if (the_channel->close)
1446 (*the_channel->close)();
1449 /* dup the in, out, err fds to 0, 1, 2 */
1460 if (getuid() != uid) {
1461 error("setuid failed");
1465 execl("/bin/sh", "sh", "-c", program, (char *)0);
1466 error("could not exec /bin/sh: %m");
1473 * run-program - execute a program with given arguments,
1474 * but don't wait for it.
1475 * If the program can't be executed, logs an error unless
1476 * must_exist is 0 and the program file doesn't exist.
1477 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1478 * or isn't an executable plain file, or the process ID of the child.
1479 * If done != NULL, (*done)(arg) will be called later (within
1480 * reap_kids) iff the return value is > 0.
1483 run_program(prog, args, must_exist, done, arg)
1487 void (*done) __P((void *));
1494 * First check if the file exists and is executable.
1495 * We don't use access() because that would use the
1496 * real user-id, which might not be root, and the script
1497 * might be accessible only to root.
1500 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1501 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1502 if (must_exist || errno != ENOENT)
1503 warn("Can't execute %s: %m", prog);
1509 error("Failed to create child process for %s: %m", prog);
1515 /* Leave the current location */
1516 (void) setsid(); /* No controlling tty. */
1517 (void) umask (S_IRWXG|S_IRWXO);
1518 (void) chdir ("/"); /* no current directory. */
1519 setuid(0); /* set real UID = root */
1522 /* Ensure that nothing of our device environment is inherited. */
1528 if (the_channel->close)
1529 (*the_channel->close)();
1531 /* Don't pass handles to the PPP device, even by accident. */
1532 new_fd = open (_PATH_DEVNULL, O_RDWR);
1535 dup2 (new_fd, 0); /* stdin <- /dev/null */
1538 dup2 (0, 1); /* stdout -> /dev/null */
1539 dup2 (0, 2); /* stderr -> /dev/null */
1543 /* Force the priority back to zero if pppd is running higher. */
1544 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1545 warn("can't reset priority to 0: %m");
1548 /* SysV recommends a second fork at this point. */
1550 /* run the program */
1551 execve(prog, args, script_env);
1552 if (must_exist || errno != ENOENT) {
1553 /* have to reopen the log, there's nowhere else
1554 for the message to go. */
1556 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1563 dbglog("Script %s started (pid %d)", prog, pid);
1564 record_child(pid, prog, done, arg);
1571 * record_child - add a child process to the list for reap_kids
1575 record_child(pid, prog, done, arg)
1578 void (*done) __P((void *));
1581 struct subprocess *chp;
1585 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1587 warn("losing track of %s process", prog);
1593 chp->next = children;
1600 * reap_kids - get status from any dead child processes,
1601 * and log a message for abnormal terminations.
1608 struct subprocess *chp, **prevp;
1610 if (n_children == 0)
1612 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1614 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1615 if (chp->pid == pid) {
1621 if (WIFSIGNALED(status)) {
1622 warn("Child process %s (pid %d) terminated with signal %d",
1623 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1625 dbglog("Script %s finished (pid %d), status = 0x%x",
1626 (chp? chp->prog: "??"), pid,
1627 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1628 if (chp && chp->done)
1629 (*chp->done)(chp->arg);
1634 if (errno == ECHILD)
1637 error("Error waiting for child process: %m");
1643 * add_notifier - add a new function to be called when something happens.
1646 add_notifier(notif, func, arg)
1647 struct notifier **notif;
1651 struct notifier *np;
1653 np = malloc(sizeof(struct notifier));
1655 novm("notifier struct");
1663 * remove_notifier - remove a function from the list of things to
1664 * be called when something happens.
1667 remove_notifier(notif, func, arg)
1668 struct notifier **notif;
1672 struct notifier *np;
1674 for (; (np = *notif) != 0; notif = &np->next) {
1675 if (np->func == func && np->arg == arg) {
1684 * notify - call a set of functions registered with add_notifier.
1688 struct notifier *notif;
1691 struct notifier *np;
1693 while ((np = notif) != 0) {
1695 (*np->func)(np->arg, val);
1700 * novm - log an error message saying we ran out of memory, and die.
1706 fatal("Virtual memory exhausted allocating %s\n", msg);
1710 * script_setenv - set an environment variable value to be used
1711 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1714 script_setenv(var, value, iskey)
1718 size_t varl = strlen(var);
1719 size_t vl = varl + strlen(value) + 2;
1721 char *p, *newstring;
1723 newstring = (char *) malloc(vl+1);
1726 *newstring++ = iskey;
1727 slprintf(newstring, vl, "%s=%s", var, value);
1729 /* check if this variable is already set */
1730 if (script_env != 0) {
1731 for (i = 0; (p = script_env[i]) != 0; ++i) {
1732 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1734 if (p[-1] && pppdb != NULL)
1738 script_env[i] = newstring;
1740 if (iskey && pppdb != NULL)
1741 add_db_key(newstring);
1748 /* no space allocated for script env. ptrs. yet */
1750 script_env = (char **) malloc(16 * sizeof(char *));
1751 if (script_env == 0)
1756 /* reallocate script_env with more space if needed */
1757 if (i + 1 >= s_env_nalloc) {
1759 char **newenv = (char **) realloc((void *)script_env,
1760 new_n * sizeof(char *));
1763 script_env = newenv;
1764 s_env_nalloc = new_n;
1767 script_env[i] = newstring;
1768 script_env[i+1] = 0;
1771 if (pppdb != NULL) {
1773 add_db_key(newstring);
1780 * script_unsetenv - remove a variable from the environment
1784 script_unsetenv(var)
1787 int vl = strlen(var);
1791 if (script_env == 0)
1793 for (i = 0; (p = script_env[i]) != 0; ++i) {
1794 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1796 if (p[-1] && pppdb != NULL)
1800 while ((script_env[i] = script_env[i+1]) != 0)
1813 * update_db_entry - update our entry in the database.
1822 if (script_env == NULL)
1825 for (i = 0; (p = script_env[i]) != 0; ++i)
1826 vlen += strlen(p) + 1;
1827 vbuf = malloc(vlen);
1829 novm("database entry");
1831 for (i = 0; (p = script_env[i]) != 0; ++i)
1832 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1835 key.dsize = strlen(db_key);
1838 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1839 error("tdb_store failed: %s", tdb_error(pppdb));
1847 * add_db_key - add a key that we can use to look up our database entry.
1855 key.dptr = (char *) str;
1856 key.dsize = strlen(str);
1858 dbuf.dsize = strlen(db_key);
1859 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1860 error("tdb_store key failed: %s", tdb_error(pppdb));
1864 * delete_db_key - delete a key for looking up our database entry.
1872 key.dptr = (char *) str;
1873 key.dsize = strlen(str);
1874 tdb_delete(pppdb, key);
1878 * cleanup_db - delete all the entries we put in the database.
1888 key.dsize = strlen(db_key);
1889 tdb_delete(pppdb, key);
1890 for (i = 0; (p = script_env[i]) != 0; ++i)
1894 #endif /* USE_TDB */