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 1.105 2001/03/12 22:58:59 paulus 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"
65 #endif /* IPX_CHANGE */
70 static const char rcsid[] = RCSID;
73 char ifname[32]; /* Interface name */
74 int ifunit; /* Interface unit number */
76 struct channel *the_channel;
78 char *progname; /* Name of this program */
79 char hostname[MAXNAMELEN]; /* Our hostname */
80 static char pidfilename[MAXPATHLEN]; /* name of pid file */
81 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
82 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
83 uid_t uid; /* Our real user-id */
84 struct notifier *pidchange = NULL;
85 struct notifier *phasechange = NULL;
86 struct notifier *exitnotify = NULL;
87 struct notifier *sigreceived = NULL;
89 int hungup; /* terminal has been hung up */
90 int privileged; /* we're running as real uid root */
91 int need_holdoff; /* need holdoff period before restarting */
92 int detached; /* have detached from terminal */
93 volatile int status; /* exit status for pppd */
94 int unsuccess; /* # unsuccessful connection attempts */
95 int do_callback; /* != 0 if we should do callback next */
96 int doing_callback; /* != 0 if we are doing callback */
97 TDB_CONTEXT *pppdb; /* database for storing status etc. */
100 int (*holdoff_hook) __P((void)) = NULL;
101 int (*new_phase_hook) __P((int)) = NULL;
103 static int conn_running; /* we have a [dis]connector running */
104 static int devfd; /* fd of underlying device */
105 static int fd_ppp = -1; /* fd for talking PPP */
106 static int fd_loop; /* fd for getting demand-dial packets */
108 int phase; /* where the link is at */
117 static sigjmp_buf sigjmp;
119 char **script_env; /* Env. variable values for scripts */
120 int s_env_nalloc; /* # words avail at script_env */
122 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
123 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
125 static int n_children; /* # child processes still running */
126 static int got_sigchld; /* set if we have received a SIGCHLD */
128 int privopen; /* don't lock, open device as root */
130 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
132 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
133 int ngroups; /* How many groups valid in groups */
135 static struct timeval start_time; /* Time when link was started. */
137 struct pppd_stats link_stats;
138 int link_connect_time;
139 int link_stats_valid;
142 * We maintain a list of child process pids and
143 * functions to call when they exit.
148 void (*done) __P((void *));
150 struct subprocess *next;
153 static struct subprocess *children;
155 /* Prototypes for procedures local to this file. */
157 static void setup_signals __P((void));
158 static void create_pidfile __P((void));
159 static void create_linkpidfile __P((void));
160 static void cleanup __P((void));
161 static void get_input __P((void));
162 static void calltimeout __P((void));
163 static struct timeval *timeleft __P((struct timeval *));
164 static void kill_my_pg __P((int));
165 static void hup __P((int));
166 static void term __P((int));
167 static void chld __P((int));
168 static void toggle_debug __P((int));
169 static void open_ccp __P((int));
170 static void bad_signal __P((int));
171 static void holdoff_end __P((void *));
172 static int reap_kids __P((int waitfor));
173 static void update_db_entry __P((void));
174 static void add_db_key __P((const char *));
175 static void delete_db_key __P((const char *));
176 static void cleanup_db __P((void));
177 static void handle_events __P((void));
178 static void setPid __P((void));
180 extern char *ttyname __P((int));
181 extern char *getlogin __P((void));
182 int main __P((int, char *[]));
186 #define O_NONBLOCK O_NDELAY
190 #define setlogmask(x)
194 * PPP Data Link Layer "protocol" table.
195 * One entry per supported protocol.
196 * The last entry must be NULL.
198 struct protent *protocols[] = {
221 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
223 #if !defined(PPP_DRV_NAME)
224 #define PPP_DRV_NAME "ppp"
225 #endif /* !defined(PPP_DRV_NAME) */
229 pppd_main(argc, argv)
239 struct protent *protp;
244 new_phase(PHASE_INITIALIZE);
247 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
248 * This way we can close 0, 1, 2 in detach() without clobbering
249 * a fd that we are using.
251 if ((i = open("/dev/null", O_RDWR)) >= 0) {
252 while (0 <= i && i <= 2)
260 /* Initialize syslog facilities */
263 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
264 option_error("Couldn't get hostname: %m");
267 hostname[MAXNAMELEN-1] = 0;
269 /* make sure we don't create world or group writable files. */
270 umask(umask(0777) | 022);
273 privileged = uid == 0;
274 slprintf(numbuf, sizeof(numbuf), "%d", uid);
275 script_setenv("ORIG_UID", numbuf, 0);
277 ngroups = getgroups(NGROUPS_MAX, groups);
280 * Initialize magic number generator now so that protocols may
281 * use magic numbers in initialization.
286 * Initialize each protocol.
288 for (i = 0; (protp = protocols[i]) != NULL; ++i)
292 * Initialize the default channel.
300 * Parse, in order, the system options file, the user's options file,
301 * and the command line arguments.
306 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
307 || !options_from_user()
309 || !parse_args(argc, argv))
310 // || !parse_args(argc-1, argv+1))
311 exit(EXIT_OPTION_ERROR);
313 parse_args(argc, argv);
314 devnam_fixed = 1; /* can no longer change device name */
319 //setdevname_pppoe("eth0");
322 * Work out the device name, if it hasn't already been specified,
323 * and parse the tty's options file.
325 if (the_channel->process_extra_options)
326 (*the_channel->process_extra_options)();
329 setlogmask(LOG_UPTO(LOG_DEBUG));
332 * Check that we are running as root.
334 if (geteuid() != 0) {
335 option_error("must be root to run %s, since it is not setuid-root",
340 if (!ppp_available()) {
341 option_error("%s", no_ppp_msg);
342 exit(EXIT_NO_KERNEL_SUPPORT);
346 * Check that the options given are valid and consistent.
351 if (!sys_check_options())
352 exit(EXIT_OPTION_ERROR);
353 auth_check_options();
354 #ifdef HAVE_MULTILINK
357 for (i = 0; (protp = protocols[i]) != NULL; ++i)
358 if (protp->check_options != NULL)
359 (*protp->check_options)();
360 if (the_channel->check_options)
361 (*the_channel->check_options)();
364 if (dump_options || dryrun) {
365 init_pr_log(NULL, LOG_INFO);
366 print_options(pr_log, NULL);
374 * Initialize system-dependent stuff.
378 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
380 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
383 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
385 warn("Warning: disabling multilink");
391 * Detach ourselves from the terminal, if required,
392 * and identify who is running us.
394 if (!nodetach && !updetach)
399 if (pw != NULL && pw->pw_name != NULL)
404 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
405 script_setenv("PPPLOGNAME", p, 0);
408 script_setenv("DEVICE", devnam, 1);
409 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
410 script_setenv("PPPD_PID", numbuf, 1);
416 // create_linkpidfile();
422 * If we're doing dial-on-demand, set up the interface now.
426 * Open the loopback channel and set it up to be the ppp interface.
428 tdb_writelock(pppdb);
429 fd_loop = open_ppp_loopback();
431 tdb_writeunlock(pppdb);
434 * Configure the interface and mark it up, etc.
447 doing_callback = do_callback;
453 syslog(LOG_NOTICE, "PPP: Start to connect ...\n");
455 if (ipext && !demandBegin)
456 while (!lan_link_up())
469 if (demand && !doing_callback && !demandBegin) {
470 //if (demand && !doing_callback) {
472 * Don't do anything until we see some activity.
474 new_phase(PHASE_DORMANT);
479 if (kill_link && !persist)
481 if (get_loop_output())
485 if (kill_link && !persist)
489 * Now we want to bring up the link.
492 info("Starting link");
499 printf("PPP: PPP%s Start to connect ...\n", req_name);
501 new_phase(PHASE_SERIALCONN);
503 devfd = the_channel->connect();
507 /* set up the serial device as a ppp interface */
508 tdb_writelock(pppdb);
509 fd_ppp = the_channel->establish_ppp(devfd);
511 tdb_writeunlock(pppdb);
512 status = EXIT_FATAL_ERROR;
516 if (!demand && ifunit >= 0)
518 tdb_writeunlock(pppdb);
521 * Start opening the connection and wait for
522 * incoming events (reply, timeout, etc.).
524 notice("Connect: %s <--> %s", ifname, ppp_devnam);
525 gettimeofday(&start_time, NULL);
526 link_stats_valid = 0;
527 script_unsetenv("CONNECT_TIME");
528 script_unsetenv("BYTES_SENT");
529 script_unsetenv("BYTES_RCVD");
533 lcp_open(0); /* Start protocol */
534 status = EXIT_NEGOTIATION_FAILED;
535 new_phase(PHASE_ESTABLISH);
536 while (phase != PHASE_DEAD) {
540 lcp_close(0, "User request");
544 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
545 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
546 (*ccp_protent.open)(0);
553 * Print connect time and statistics.
555 if (link_stats_valid) {
556 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
557 info("Connect time %d.%d minutes.", t/10, t%10);
558 info("Sent %u bytes, received %u bytes.",
559 link_stats.bytes_out, link_stats.bytes_in);
563 * Delete pid file before disestablishing ppp. Otherwise it
564 * can happen that another pppd gets the same unit and then
565 * we delete its pid file.
568 if (pidfilename[0] != 0
569 && unlink(pidfilename) < 0 && errno != ENOENT)
570 warn("unable to delete pid file %s: %m", pidfilename);
575 * If we may want to bring the link up again, transfer
576 * the ppp unit back to the loopback. Set the
577 * real serial device back to its normal mode of operation.
581 the_channel->disestablish_ppp(devfd);
586 script_unsetenv("IFNAME");
589 * Run disconnector script, if requested.
590 * XXX we may not be able to do this if the line has hung up!
593 new_phase(PHASE_DISCONNECT);
594 the_channel->disconnect();
597 if (the_channel->cleanup)
598 (*the_channel->cleanup)();
601 if (pidfilename[0] != 0
602 && unlink(pidfilename) < 0 && errno != ENOENT)
603 warn("unable to delete pid file %s: %m", pidfilename);
607 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
610 // printf("PPP: fail test\n");
615 t = need_holdoff? holdoff: 0;
617 t = (*holdoff_hook)();
619 new_phase(PHASE_HOLDOFF);
620 TIMEOUT(holdoff_end, NULL, t);
624 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
625 } while (phase == PHASE_HOLDOFF);
631 /* Wait for scripts to finish */
632 /* XXX should have a timeout here */
633 while (n_children > 0) {
635 struct subprocess *chp;
636 dbglog("Waiting for %d child processes...", n_children);
637 for (chp = children; chp != NULL; chp = chp->next)
638 dbglog(" script %s, pid %d", chp->prog, chp->pid);
640 if (reap_kids(1) < 0)
649 * handle_events - wait for something to happen and respond to it.
657 kill_link = open_ccp_flag = 0;
658 if (sigsetjmp(sigjmp, 1) == 0) {
659 sigprocmask(SIG_BLOCK, &mask, NULL);
660 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
661 sigprocmask(SIG_UNBLOCK, &mask, NULL);
664 sigprocmask(SIG_UNBLOCK, &mask, NULL);
665 wait_input(timeleft(&timo));
673 if (status != EXIT_HANGUP)
674 status = EXIT_USER_REQUEST;
679 status = EXIT_USER_REQUEST;
683 reap_kids(0); /* Don't leave dead kids lying around */
693 * setup_signals - initialize signal handling.
702 * Compute mask of all interesting signals and install signal handlers
703 * for each. Only one signal handler may be active at a time. Therefore,
704 * all other signals should be masked when any handler is executing.
707 sigaddset(&mask, SIGHUP);
708 sigaddset(&mask, SIGINT);
709 sigaddset(&mask, SIGTERM);
710 sigaddset(&mask, SIGCHLD);
711 sigaddset(&mask, SIGUSR2);
713 #define SIGNAL(s, handler) do { \
714 sa.sa_handler = handler; \
715 if (sigaction(s, &sa, NULL) < 0) \
716 fatal("Couldn't establish signal handler (%d): %m", s); \
721 SIGNAL(SIGHUP, hup); /* Hangup */
722 SIGNAL(SIGINT, SIG_IGN); /* Interrupt */
723 SIGNAL(SIGTERM, term); /* Terminate */
724 SIGNAL(SIGCHLD, chld);
726 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
727 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
730 * Install a handler for other signals which would otherwise
731 * cause pppd to exit without cleaning up.
733 SIGNAL(SIGABRT, bad_signal);
734 SIGNAL(SIGALRM, bad_signal);
735 SIGNAL(SIGFPE, bad_signal);
736 SIGNAL(SIGILL, bad_signal);
737 SIGNAL(SIGPIPE, bad_signal);
738 SIGNAL(SIGQUIT, bad_signal);
739 SIGNAL(SIGSEGV, bad_signal);
741 SIGNAL(SIGBUS, bad_signal);
744 SIGNAL(SIGEMT, bad_signal);
747 SIGNAL(SIGPOLL, bad_signal);
750 SIGNAL(SIGPROF, bad_signal);
753 SIGNAL(SIGSYS, bad_signal);
756 SIGNAL(SIGTRAP, bad_signal);
759 SIGNAL(SIGVTALRM, bad_signal);
762 SIGNAL(SIGXCPU, bad_signal);
765 SIGNAL(SIGXFSZ, bad_signal);
769 * Apparently we can get a SIGPIPE when we call syslog, if
770 * syslogd has died and been restarted. Ignoring it seems
773 signal(SIGPIPE, SIG_IGN);
777 * set_ifunit - do things we need to do once we know which ppp
785 info("Using interface %s%s", PPP_DRV_NAME, req_name);
786 slprintf(ifname, sizeof(ifname), "%s_%s", PPP_DRV_NAME, req_name);
787 // info("Using interface %s%d", PPP_DRV_NAME, ifunit);
788 // slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
789 script_setenv("IFNAME", ifname, iskey);
791 // create_pidfile(); /* write pid to file */
792 // create_linkpidfile();
797 * detach - detach us from the controlling terminal.
807 if ((pid = fork()) < 0) {
808 error("Couldn't detach (fork failed: %m)");
809 die(1); /* or just return? */
813 notify(pidchange, pid);
814 exit(0); /* parent dies */
824 /* update pid files if they have been written already */
825 // if (pidfilename[0])
827 // if (linkpidfile[0])
828 // create_linkpidfile();
829 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
830 script_setenv("PPPD_PID", numbuf, 1);
834 * reopen_log - (re)open our connection to syslog.
840 openlog("pppd", LOG_PID);
842 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
843 setlogmask(LOG_UPTO(LOG_INFO));
851 sprintf(path, "%s/%s/%s", "/proc/var/fyi/wan", session_path, "pid");
852 sprintf(cmd, "echo %d > %s", getpid(), path);
858 * Create a file containing our process ID.
865 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
866 _PATH_VARRUN, ifname);
867 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
868 fprintf(pidfile, "%d\n", getpid());
869 (void) fclose(pidfile);
871 error("Failed to create pid file %s: %m", pidfilename);
881 if (linkname[0] == 0)
883 script_setenv("LINKNAME", linkname, 1);
884 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
885 _PATH_VARRUN, linkname);
886 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
887 fprintf(pidfile, "%d\n", getpid());
889 fprintf(pidfile, "%s\n", ifname);
890 (void) fclose(pidfile);
892 error("Failed to create pid file %s: %m", linkpidfile);
900 * holdoff_end - called via a timeout when the holdoff period ends.
906 new_phase(PHASE_DORMANT);
909 /* List of protocol names, to make our messages a little more informative. */
910 struct protocol_list {
913 } protocol_list[] = {
915 { 0x23, "OSI Network Layer" },
916 { 0x25, "Xerox NS IDP" },
917 { 0x27, "DECnet Phase IV" },
918 { 0x29, "Appletalk" },
919 { 0x2b, "Novell IPX" },
920 { 0x2d, "VJ compressed TCP/IP" },
921 { 0x2f, "VJ uncompressed TCP/IP" },
922 { 0x31, "Bridging PDU" },
923 { 0x33, "Stream Protocol ST-II" },
924 { 0x35, "Banyan Vines" },
925 { 0x39, "AppleTalk EDDP" },
926 { 0x3b, "AppleTalk SmartBuffered" },
927 { 0x3d, "Multi-Link" },
928 { 0x3f, "NETBIOS Framing" },
929 { 0x41, "Cisco Systems" },
930 { 0x43, "Ascom Timeplex" },
931 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
932 { 0x47, "DCA Remote Lan" },
933 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
934 { 0x4b, "SNA over 802.2" },
936 { 0x4f, "IP6 Header Compression" },
937 { 0x6f, "Stampede Bridging" },
938 { 0xfb, "single-link compression" },
939 { 0xfd, "1st choice compression" },
940 { 0x0201, "802.1d Hello Packets" },
941 { 0x0203, "IBM Source Routing BPDU" },
942 { 0x0205, "DEC LANBridge100 Spanning Tree" },
943 { 0x0231, "Luxcom" },
944 { 0x0233, "Sigma Network Systems" },
945 { 0x8021, "Internet Protocol Control Protocol" },
946 { 0x8023, "OSI Network Layer Control Protocol" },
947 { 0x8025, "Xerox NS IDP Control Protocol" },
948 { 0x8027, "DECnet Phase IV Control Protocol" },
949 { 0x8029, "Appletalk Control Protocol" },
950 { 0x802b, "Novell IPX Control Protocol" },
951 { 0x8031, "Bridging NCP" },
952 { 0x8033, "Stream Protocol Control Protocol" },
953 { 0x8035, "Banyan Vines Control Protocol" },
954 { 0x803d, "Multi-Link Control Protocol" },
955 { 0x803f, "NETBIOS Framing Control Protocol" },
956 { 0x8041, "Cisco Systems Control Protocol" },
957 { 0x8043, "Ascom Timeplex" },
958 { 0x8045, "Fujitsu LBLB Control Protocol" },
959 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
960 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
961 { 0x804b, "SNA over 802.2 Control Protocol" },
962 { 0x804d, "SNA Control Protocol" },
963 { 0x804f, "IP6 Header Compression Control Protocol" },
964 { 0x006f, "Stampede Bridging Control Protocol" },
965 { 0x80fb, "Single Link Compression Control Protocol" },
966 { 0x80fd, "Compression Control Protocol" },
967 { 0xc021, "Link Control Protocol" },
968 { 0xc023, "Password Authentication Protocol" },
969 { 0xc025, "Link Quality Report" },
970 { 0xc027, "Shiva Password Authentication Protocol" },
971 { 0xc029, "CallBack Control Protocol (CBCP)" },
972 { 0xc081, "Container Control Protocol" },
973 { 0xc223, "Challenge Handshake Authentication Protocol" },
974 { 0xc281, "Proprietary Authentication Protocol" },
979 * protocol_name - find a name for a PPP protocol.
985 struct protocol_list *lp;
987 for (lp = protocol_list; lp->proto != 0; ++lp)
988 if (proto == lp->proto)
994 * get_input - called when incoming data is available.
1002 struct protent *protp;
1004 p = inpacket_buf; /* point to beginning of packet buffer */
1006 len = read_packet(inpacket_buf);
1011 notice("Modem hangup");
1013 status = EXIT_HANGUP;
1014 lcp_lowerdown(0); /* serial link is no longer available */
1019 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1020 dbglog("rcvd %P", p, len);
1022 if (len < PPP_HDRLEN) {
1023 MAINDEBUG(("io(): Received short packet."));
1027 p += 2; /* Skip address and control */
1028 GETSHORT(protocol, p);
1032 * Toss all non-LCP packets unless LCP is OPEN.
1034 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1035 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
1040 * Until we get past the authentication phase, toss all packets
1041 * except LCP, LQR and authentication packets.
1043 if (phase <= PHASE_AUTHENTICATE
1044 && !(protocol == PPP_LCP || protocol == PPP_LQR
1045 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
1046 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
1052 * Upcall the proper protocol input routine.
1054 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1055 if (protp->protocol == protocol && protp->enabled_flag) {
1056 (*protp->input)(0, p, len);
1059 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1060 && protp->datainput != NULL) {
1061 (*protp->datainput)(0, p, len);
1067 const char *pname = protocol_name(protocol);
1069 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1071 warn("Unsupported protocol 0x%x received", protocol);
1073 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1077 * new_phase - signal the start of a new phase of pppd's operation.
1085 (*new_phase_hook)(p);
1086 notify(phasechange, p);
1090 * die - clean up state and exit with the specified status.
1097 notify(exitnotify, status);
1098 syslog(LOG_INFO, "Exit.");
1103 * cleanup - restore anything which needs to be restored before we exit
1112 the_channel->disestablish_ppp(devfd);
1113 if (the_channel->cleanup)
1114 (*the_channel->cleanup)();
1116 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1117 warn("unable to delete pid file %s: %m", pidfilename);
1119 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1120 warn("unable to delete pid file %s: %m", linkpidfile);
1128 * update_link_stats - get stats at link termination.
1131 update_link_stats(u)
1137 if (!get_ppp_stats(u, &link_stats)
1138 || gettimeofday(&now, NULL) < 0)
1140 link_connect_time = now.tv_sec - start_time.tv_sec;
1141 link_stats_valid = 1;
1143 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1144 script_setenv("CONNECT_TIME", numbuf, 0);
1145 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1146 script_setenv("BYTES_SENT", numbuf, 0);
1147 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1148 script_setenv("BYTES_RCVD", numbuf, 0);
1153 struct timeval c_time; /* time at which to call routine */
1154 void *c_arg; /* argument to routine */
1155 void (*c_func) __P((void *)); /* routine */
1156 struct callout *c_next;
1159 static struct callout *callout = NULL; /* Callout list */
1160 static struct timeval timenow; /* Current time */
1163 * timeout - Schedule a timeout.
1165 * Note that this timeout takes the number of milliseconds, NOT hz (as in
1169 timeout(func, arg, secs, usecs)
1170 void (*func) __P((void *));
1174 struct callout *newp, *p, **pp;
1176 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1182 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1183 fatal("Out of memory in timeout()!");
1185 newp->c_func = func;
1186 gettimeofday(&timenow, NULL);
1187 newp->c_time.tv_sec = timenow.tv_sec + secs;
1188 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1189 if (newp->c_time.tv_usec >= 1000000) {
1190 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1191 newp->c_time.tv_usec %= 1000000;
1195 * Find correct place and link it in.
1197 for (pp = &callout; (p = *pp); pp = &p->c_next)
1198 if (newp->c_time.tv_sec < p->c_time.tv_sec
1199 || (newp->c_time.tv_sec == p->c_time.tv_sec
1200 && newp->c_time.tv_usec < p->c_time.tv_usec))
1208 * untimeout - Unschedule a timeout.
1211 untimeout(func, arg)
1212 void (*func) __P((void *));
1215 struct callout **copp, *freep;
1217 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1220 * Find first matching timeout and remove it from the list.
1222 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1223 if (freep->c_func == func && freep->c_arg == arg) {
1224 *copp = freep->c_next;
1225 free((char *) freep);
1232 * calltimeout - Call any timeout routines which are now due.
1239 while (callout != NULL) {
1242 if (gettimeofday(&timenow, NULL) < 0)
1243 fatal("Failed to get time of day: %m");
1244 if (!(p->c_time.tv_sec < timenow.tv_sec
1245 || (p->c_time.tv_sec == timenow.tv_sec
1246 && p->c_time.tv_usec <= timenow.tv_usec)))
1247 break; /* no, it's not time yet */
1249 callout = p->c_next;
1250 (*p->c_func)(p->c_arg);
1258 * timeleft - return the length of time until the next timeout is due.
1260 static struct timeval *
1262 struct timeval *tvp;
1264 if (callout == NULL)
1267 gettimeofday(&timenow, NULL);
1268 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1269 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1270 if (tvp->tv_usec < 0) {
1271 tvp->tv_usec += 1000000;
1274 if (tvp->tv_sec < 0)
1275 tvp->tv_sec = tvp->tv_usec = 0;
1282 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1288 struct sigaction act, oldact;
1290 act.sa_handler = SIG_IGN;
1293 sigaction(sig, &act, &oldact);
1294 sigaction(sig, &oldact, NULL);
1299 * hup - Catch SIGHUP signal.
1301 * Indicates that the physical layer has been disconnected.
1302 * We don't rely on this indication; if the user has sent this
1303 * signal, we just take the link down.
1309 info("Hangup (SIGHUP)");
1312 /* Send the signal to the [dis]connector process(es) also */
1314 notify(sigreceived, sig);
1316 siglongjmp(sigjmp, 1);
1321 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1323 * Indicates that we should initiate a graceful disconnect and exit.
1330 info("Terminating on signal %d.", sig);
1333 /* Send the signal to the [dis]connector process(es) also */
1335 notify(sigreceived, sig);
1337 siglongjmp(sigjmp, 1);
1342 * chld - Catch SIGCHLD signal.
1343 * Sets a flag so we will call reap_kids in the mainline.
1351 siglongjmp(sigjmp, 1);
1356 * toggle_debug - Catch SIGUSR1 signal.
1358 * Toggle debug flag.
1367 setlogmask(LOG_UPTO(LOG_DEBUG));
1369 setlogmask(LOG_UPTO(LOG_WARNING));
1375 * open_ccp - Catch SIGUSR2 signal.
1377 * Try to (re)negotiate compression.
1386 siglongjmp(sigjmp, 1);
1391 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1397 static int crashed = 0;
1402 error("Fatal signal %d", sig);
1404 kill_my_pg(SIGTERM);
1405 notify(sigreceived, sig);
1411 * device_script - run a program to talk to the specified fds
1412 * (e.g. to run the connector or disconnector script).
1413 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1416 device_script(program, in, out, dont_wait)
1430 error("Failed to create child process: %m");
1436 record_child(pid, program, NULL, NULL);
1439 while (waitpid(pid, &status, 0) < 0) {
1442 fatal("error waiting for (dis)connection process: %m");
1446 return (status == 0 ? 0 : -1);
1449 /* here we are executing in the child */
1450 /* make sure fds 0, 1, 2 are occupied */
1451 while ((fd = dup(in)) >= 0) {
1458 /* dup in and out to fds > 2 */
1461 if (log_to_fd >= 0) {
1462 errfd = dup(log_to_fd);
1464 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1467 /* close fds 0 - 2 and any others we can think of */
1472 if (the_channel->close)
1473 (*the_channel->close)();
1476 /* dup the in, out, err fds to 0, 1, 2 */
1487 if (getuid() != uid) {
1488 error("setuid failed");
1492 execl("/bin/sh", "sh", "-c", program, (char *)0);
1493 error("could not exec /bin/sh: %m");
1500 * run-program - execute a program with given arguments,
1501 * but don't wait for it.
1502 * If the program can't be executed, logs an error unless
1503 * must_exist is 0 and the program file doesn't exist.
1504 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1505 * or isn't an executable plain file, or the process ID of the child.
1506 * If done != NULL, (*done)(arg) will be called later (within
1507 * reap_kids) iff the return value is > 0.
1510 run_program(prog, args, must_exist, done, arg)
1514 void (*done) __P((void *));
1521 * First check if the file exists and is executable.
1522 * We don't use access() because that would use the
1523 * real user-id, which might not be root, and the script
1524 * might be accessible only to root.
1527 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1528 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1529 if (must_exist || errno != ENOENT)
1530 warn("Can't execute %s: %m", prog);
1536 error("Failed to create child process for %s: %m", prog);
1542 /* Leave the current location */
1543 (void) setsid(); /* No controlling tty. */
1544 (void) umask (S_IRWXG|S_IRWXO);
1545 (void) chdir ("/"); /* no current directory. */
1546 setuid(0); /* set real UID = root */
1549 /* Ensure that nothing of our device environment is inherited. */
1555 if (the_channel->close)
1556 (*the_channel->close)();
1558 /* Don't pass handles to the PPP device, even by accident. */
1559 new_fd = open (_PATH_DEVNULL, O_RDWR);
1562 dup2 (new_fd, 0); /* stdin <- /dev/null */
1565 dup2 (0, 1); /* stdout -> /dev/null */
1566 dup2 (0, 2); /* stderr -> /dev/null */
1570 /* Force the priority back to zero if pppd is running higher. */
1571 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1572 warn("can't reset priority to 0: %m");
1575 /* SysV recommends a second fork at this point. */
1577 /* run the program */
1578 execve(prog, args, script_env);
1579 if (must_exist || errno != ENOENT) {
1580 /* have to reopen the log, there's nowhere else
1581 for the message to go. */
1583 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1590 dbglog("Script %s started (pid %d)", prog, pid);
1591 record_child(pid, prog, done, arg);
1598 * record_child - add a child process to the list for reap_kids
1602 record_child(pid, prog, done, arg)
1605 void (*done) __P((void *));
1608 struct subprocess *chp;
1612 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1614 warn("losing track of %s process", prog);
1620 chp->next = children;
1627 * reap_kids - get status from any dead child processes,
1628 * and log a message for abnormal terminations.
1635 struct subprocess *chp, **prevp;
1637 if (n_children == 0)
1639 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1641 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1642 if (chp->pid == pid) {
1648 if (WIFSIGNALED(status)) {
1649 warn("Child process %s (pid %d) terminated with signal %d",
1650 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1652 dbglog("Script %s finished (pid %d), status = 0x%x",
1653 (chp? chp->prog: "??"), pid, status);
1654 if (chp && chp->done)
1655 (*chp->done)(chp->arg);
1660 if (errno == ECHILD)
1663 error("Error waiting for child process: %m");
1669 * add_notifier - add a new function to be called when something happens.
1672 add_notifier(notif, func, arg)
1673 struct notifier **notif;
1677 struct notifier *np;
1679 np = malloc(sizeof(struct notifier));
1681 novm("notifier struct");
1689 * remove_notifier - remove a function from the list of things to
1690 * be called when something happens.
1693 remove_notifier(notif, func, arg)
1694 struct notifier **notif;
1698 struct notifier *np;
1700 for (; (np = *notif) != 0; notif = &np->next) {
1701 if (np->func == func && np->arg == arg) {
1710 * notify - call a set of functions registered with add_notify.
1714 struct notifier *notif;
1717 struct notifier *np;
1719 while ((np = notif) != 0) {
1721 (*np->func)(np->arg, val);
1726 * novm - log an error message saying we ran out of memory, and die.
1732 fatal("Virtual memory exhausted allocating %s\n", msg);
1736 * script_setenv - set an environment variable value to be used
1737 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1740 script_setenv(var, value, iskey)
1746 size_t varl = strlen(var);
1747 size_t vl = varl + strlen(value) + 2;
1749 char *p, *newstring;
1751 newstring = (char *) malloc(vl+1);
1754 *newstring++ = iskey;
1755 slprintf(newstring, vl, "%s=%s", var, value);
1757 /* check if this variable is already set */
1758 if (script_env != 0) {
1759 for (i = 0; (p = script_env[i]) != 0; ++i) {
1760 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1761 if (p[-1] && pppdb != NULL)
1764 script_env[i] = newstring;
1765 if (iskey && pppdb != NULL)
1766 add_db_key(newstring);
1772 /* no space allocated for script env. ptrs. yet */
1774 script_env = (char **) malloc(16 * sizeof(char *));
1775 if (script_env == 0)
1780 /* reallocate script_env with more space if needed */
1781 if (i + 1 >= s_env_nalloc) {
1783 char **newenv = (char **) realloc((void *)script_env,
1784 new_n * sizeof(char *));
1787 script_env = newenv;
1788 s_env_nalloc = new_n;
1791 script_env[i] = newstring;
1792 script_env[i+1] = 0;
1794 if (pppdb != NULL) {
1796 add_db_key(newstring);
1804 * script_unsetenv - remove a variable from the environment
1808 script_unsetenv(var)
1813 int vl = strlen(var);
1817 if (script_env == 0)
1819 for (i = 0; (p = script_env[i]) != 0; ++i) {
1820 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1821 if (p[-1] && pppdb != NULL)
1824 while ((script_env[i] = script_env[i+1]) != 0)
1836 * update_db_entry - update our entry in the database.
1847 if (script_env == NULL)
1850 for (i = 0; (p = script_env[i]) != 0; ++i)
1851 vlen += strlen(p) + 1;
1852 vbuf = malloc(vlen);
1854 novm("database entry");
1856 for (i = 0; (p = script_env[i]) != 0; ++i)
1857 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1860 key.dsize = strlen(db_key);
1863 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1864 error("tdb_store failed: %s", tdb_error(pppdb));
1870 * add_db_key - add a key that we can use to look up our database entry.
1880 key.dptr = (char *) str;
1881 key.dsize = strlen(str);
1883 dbuf.dsize = strlen(db_key);
1884 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1885 error("tdb_store key failed: %s", tdb_error(pppdb));
1891 * delete_db_key - delete a key for looking up our database entry.
1901 key.dptr = (char *) str;
1902 key.dsize = strlen(str);
1903 tdb_delete(pppdb, key);
1909 * cleanup_db - delete all the entries we put in the database.
1921 key.dsize = strlen(db_key);
1922 tdb_delete(pppdb, key);
1923 for (i = 0; (p = script_env[i]) != 0; ++i)