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 1.99 2000/06/30 04:54:20 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"
57 #include "patchlevel.h"
66 #endif /* IPX_CHANGE */
71 static const char rcsid[] = RCSID;
74 char ifname[32]; /* Interface name */
75 int ifunit; /* Interface unit number */
77 char *progname; /* Name of this program */
78 char hostname[MAXNAMELEN]; /* Our hostname */
79 static char pidfilename[MAXPATHLEN]; /* name of pid file */
80 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
81 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
82 uid_t uid; /* Our real user-id */
83 struct notifier *pidchange = NULL;
84 struct notifier *phasechange = NULL;
85 struct notifier *exitnotify = NULL;
86 struct notifier *sigreceived = NULL;
88 int hungup; /* terminal has been hung up */
89 int privileged; /* we're running as real uid root */
90 int need_holdoff; /* need holdoff period before restarting */
91 int detached; /* have detached from terminal */
92 struct stat devstat; /* result of stat() on devnam */
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 */
113 static sigjmp_buf sigjmp;
115 char **script_env; /* Env. variable values for scripts */
116 int s_env_nalloc; /* # words avail at script_env */
118 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
119 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
121 static int n_children; /* # child processes still running */
122 static int got_sigchld; /* set if we have received a SIGCHLD */
124 int privopen; /* don't lock, open device as root */
126 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
128 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
129 int ngroups; /* How many groups valid in groups */
131 static struct timeval start_time; /* Time when link was started. */
133 struct pppd_stats link_stats;
134 int link_connect_time;
135 int link_stats_valid;
138 * We maintain a list of child process pids and
139 * functions to call when they exit.
144 void (*done) __P((void *));
146 struct subprocess *next;
149 static struct subprocess *children;
151 /* Prototypes for procedures local to this file. */
153 static void setup_signals __P((void));
154 static void create_pidfile __P((void));
155 static void create_linkpidfile __P((void));
156 static void cleanup __P((void));
157 static void get_input __P((void));
158 static void calltimeout __P((void));
159 static struct timeval *timeleft __P((struct timeval *));
160 static void kill_my_pg __P((int));
161 static void hup __P((int));
162 static void term __P((int));
163 static void chld __P((int));
164 static void toggle_debug __P((int));
165 static void open_ccp __P((int));
166 static void bad_signal __P((int));
167 static void holdoff_end __P((void *));
168 static int reap_kids __P((int waitfor));
169 static void update_db_entry __P((void));
170 static void add_db_key __P((const char *));
171 static void delete_db_key __P((const char *));
172 static void cleanup_db __P((void));
174 extern char *ttyname __P((int));
175 extern char *getlogin __P((void));
176 int main __P((int, char *[]));
180 #define O_NONBLOCK O_NDELAY
184 #define setlogmask(x)
188 * PPP Data Link Layer "protocol" table.
189 * One entry per supported protocol.
190 * The last entry must be NULL.
192 struct protent *protocols[] = {
214 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
216 #if !defined(PPP_DRV_NAME)
217 #define PPP_DRV_NAME "ppp"
218 #endif /* !defined(PPP_DRV_NAME) */
230 struct protent *protp;
234 new_phase(PHASE_INITIALIZE);
237 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
238 * This way we can close 0, 1, 2 in detach() without clobbering
239 * a fd that we are using.
241 if ((i = open("/dev/null", O_RDWR)) >= 0) {
242 while (0 <= i && i <= 2)
250 /* Initialize syslog facilities */
253 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
254 option_error("Couldn't get hostname: %m");
257 hostname[MAXNAMELEN-1] = 0;
259 /* make sure we don't create world or group writable files. */
260 umask(umask(0777) | 022);
263 privileged = uid == 0;
264 slprintf(numbuf, sizeof(numbuf), "%d", uid);
265 script_setenv("ORIG_UID", numbuf, 0);
267 ngroups = getgroups(NGROUPS_MAX, groups);
270 * Initialize magic number generator now so that protocols may
271 * use magic numbers in initialization.
276 * Initialize each protocol.
278 for (i = 0; (protp = protocols[i]) != NULL; ++i)
284 * Parse, in order, the system options file, the user's options file,
285 * the tty's options file, and the command line arguments.
287 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
288 || !options_from_user()
289 || !parse_args(argc-1, argv+1))
290 exit(EXIT_OPTION_ERROR);
293 * Work out the device name, if it hasn't already been specified.
295 using_pty = notty || ptycommand != NULL || pty_socket != NULL;
296 if (!using_pty && default_device) {
298 if (!isatty(0) || (p = ttyname(0)) == NULL) {
299 option_error("no device specified and stdin is not a tty");
300 exit(EXIT_OPTION_ERROR);
302 strlcpy(devnam, p, sizeof(devnam));
303 if (stat(devnam, &devstat) < 0)
304 fatal("Couldn't stat default device %s: %m", devnam);
308 * Parse the tty options file.
309 * The per-tty options file should not change
310 * ptycommand, pty_socket, notty or devnam.
312 if (!using_pty && !options_for_tty())
313 exit(EXIT_OPTION_ERROR);
316 * Check that we are running as root.
318 if (geteuid() != 0) {
319 option_error("must be root to run %s, since it is not setuid-root",
324 if (!ppp_available()) {
325 option_error(no_ppp_msg);
326 exit(EXIT_NO_KERNEL_SUPPORT);
330 * Check that the options given are valid and consistent.
332 if (!sys_check_options())
333 exit(EXIT_OPTION_ERROR);
334 auth_check_options();
335 #ifdef HAVE_MULTILINK
338 for (i = 0; (protp = protocols[i]) != NULL; ++i)
339 if (protp->check_options != NULL)
340 (*protp->check_options)();
341 if (demand && connect_script == 0) {
342 option_error("connect script is required for demand-dialling\n");
343 exit(EXIT_OPTION_ERROR);
345 /* default holdoff to 0 if no connect script has been given */
346 if (connect_script == 0 && !holdoff_specified)
350 if (!default_device) {
351 option_error("%s option precludes specifying device name",
352 notty? "notty": "pty");
353 exit(EXIT_OPTION_ERROR);
355 if (ptycommand != NULL && notty) {
356 option_error("pty option is incompatible with notty option");
357 exit(EXIT_OPTION_ERROR);
359 if (pty_socket != NULL && (ptycommand != NULL || notty)) {
360 option_error("socket option is incompatible with pty and notty");
361 exit(EXIT_OPTION_ERROR);
363 default_device = notty;
366 if (notty && log_to_fd <= 1)
370 * If the user has specified a device which is the same as
371 * the one on stdin, pretend they didn't specify any.
372 * If the device is already open read/write on stdin,
373 * we assume we don't need to lock it, and we can open it as root.
375 if (fstat(0, &statbuf) >= 0 && S_ISCHR(statbuf.st_mode)
376 && statbuf.st_rdev == devstat.st_rdev) {
378 fdflags = fcntl(0, F_GETFL);
379 if (fdflags != -1 && (fdflags & O_ACCMODE) == O_RDWR)
387 * Don't send log messages to the serial port, it tends to
388 * confuse the peer. :-)
390 if (log_to_fd >= 0 && fstat(log_to_fd, &statbuf) >= 0
391 && S_ISCHR(statbuf.st_mode) && statbuf.st_rdev == devstat.st_rdev)
395 * Initialize system-dependent stuff.
399 setlogmask(LOG_UPTO(LOG_DEBUG));
401 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
403 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
406 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
408 warn("Warning: disabling multilink");
414 * Detach ourselves from the terminal, if required,
415 * and identify who is running us.
417 if (!nodetach && !updetach)
422 if (pw != NULL && pw->pw_name != NULL)
427 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
428 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
429 script_setenv("PPPLOGNAME", p, 0);
432 script_setenv("DEVICE", devnam, 1);
433 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
434 script_setenv("PPPD_PID", numbuf, 1);
440 create_linkpidfile();
443 * If we're doing dial-on-demand, set up the interface now.
447 * Open the loopback channel and set it up to be the ppp interface.
449 tdb_writelock(pppdb);
450 fd_loop = open_ppp_loopback();
452 tdb_writeunlock(pppdb);
455 * Configure the interface and mark it up, etc.
467 doing_callback = do_callback;
470 if (demand && !doing_callback) {
472 * Don't do anything until we see some activity.
475 new_phase(PHASE_DORMANT);
479 if (sigsetjmp(sigjmp, 1) == 0) {
480 sigprocmask(SIG_BLOCK, &mask, NULL);
481 if (kill_link || got_sigchld) {
482 sigprocmask(SIG_UNBLOCK, &mask, NULL);
485 sigprocmask(SIG_UNBLOCK, &mask, NULL);
486 wait_input(timeleft(&timo));
496 if (get_loop_output())
502 if (kill_link && !persist)
506 * Now we want to bring up the link.
509 info("Starting link");
512 new_phase(PHASE_SERIALCONN);
514 devfd = connect_tty();
518 /* set up the serial device as a ppp interface */
519 tdb_writelock(pppdb);
520 fd_ppp = establish_ppp(devfd);
522 tdb_writeunlock(pppdb);
523 status = EXIT_FATAL_ERROR;
527 if (!demand && ifunit >= 0)
529 tdb_writeunlock(pppdb);
532 * Start opening the connection and wait for
533 * incoming events (reply, timeout, etc.).
535 notice("Connect: %s <--> %s", ifname, ppp_devnam);
536 gettimeofday(&start_time, NULL);
537 link_stats_valid = 0;
538 script_unsetenv("CONNECT_TIME");
539 script_unsetenv("BYTES_SENT");
540 script_unsetenv("BYTES_RCVD");
544 * If we are initiating this connection, wait for a short
545 * time for something from the peer. This can avoid bouncing
546 * our packets off his tty before he has it set up.
550 if (connect_delay != 0 && (connector != NULL || ptycommand != NULL)) {
552 t.tv_sec = connect_delay / 1000;
553 t.tv_usec = connect_delay % 1000;
558 lcp_open(0); /* Start protocol */
560 status = EXIT_NEGOTIATION_FAILED;
561 new_phase(PHASE_ESTABLISH);
562 while (phase != PHASE_DEAD) {
563 if (sigsetjmp(sigjmp, 1) == 0) {
564 sigprocmask(SIG_BLOCK, &mask, NULL);
565 if (kill_link || open_ccp_flag || got_sigchld) {
566 sigprocmask(SIG_UNBLOCK, &mask, NULL);
569 sigprocmask(SIG_UNBLOCK, &mask, NULL);
570 wait_input(timeleft(&timo));
577 lcp_close(0, "User request");
581 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
582 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
583 (*ccp_protent.open)(0);
588 reap_kids(0); /* Don't leave dead kids lying around */
592 * Print connect time and statistics.
594 if (link_stats_valid) {
595 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
596 info("Connect time %d.%d minutes.", t/10, t%10);
597 info("Sent %d bytes, received %d bytes.",
598 link_stats.bytes_out, link_stats.bytes_in);
602 * Delete pid file before disestablishing ppp. Otherwise it
603 * can happen that another pppd gets the same unit and then
604 * we delete its pid file.
607 if (pidfilename[0] != 0
608 && unlink(pidfilename) < 0 && errno != ENOENT)
609 warn("unable to delete pid file %s: %m", pidfilename);
614 * If we may want to bring the link up again, transfer
615 * the ppp unit back to the loopback. Set the
616 * real serial device back to its normal mode of operation.
622 disestablish_ppp(devfd);
627 script_unsetenv("IFNAME");
630 * Run disconnector script, if requested.
631 * XXX we may not be able to do this if the line has hung up!
634 new_phase(PHASE_DISCONNECT);
641 if (pidfilename[0] != 0
642 && unlink(pidfilename) < 0 && errno != ENOENT)
643 warn("unable to delete pid file %s: %m", pidfilename);
647 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
653 t = need_holdoff? holdoff: 0;
655 t = (*holdoff_hook)();
657 new_phase(PHASE_HOLDOFF);
658 TIMEOUT(holdoff_end, NULL, t);
660 if (sigsetjmp(sigjmp, 1) == 0) {
661 sigprocmask(SIG_BLOCK, &mask, NULL);
662 if (kill_link || got_sigchld) {
663 sigprocmask(SIG_UNBLOCK, &mask, NULL);
666 sigprocmask(SIG_UNBLOCK, &mask, NULL);
667 wait_input(timeleft(&timo));
674 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
678 } while (phase == PHASE_HOLDOFF);
684 /* Wait for scripts to finish */
685 /* XXX should have a timeout here */
686 while (n_children > 0) {
688 struct subprocess *chp;
689 dbglog("Waiting for %d child processes...", n_children);
690 for (chp = children; chp != NULL; chp = chp->next)
691 dbglog(" script %s, pid %d", chp->prog, chp->pid);
693 if (reap_kids(1) < 0)
702 * setup_signals - initialize signal handling.
711 * Compute mask of all interesting signals and install signal handlers
712 * for each. Only one signal handler may be active at a time. Therefore,
713 * all other signals should be masked when any handler is executing.
716 sigaddset(&mask, SIGHUP);
717 sigaddset(&mask, SIGINT);
718 sigaddset(&mask, SIGTERM);
719 sigaddset(&mask, SIGCHLD);
720 sigaddset(&mask, SIGUSR2);
722 #define SIGNAL(s, handler) do { \
723 sa.sa_handler = handler; \
724 if (sigaction(s, &sa, NULL) < 0) \
725 fatal("Couldn't establish signal handler (%d): %m", s); \
730 SIGNAL(SIGHUP, hup); /* Hangup */
731 SIGNAL(SIGINT, term); /* Interrupt */
732 SIGNAL(SIGTERM, term); /* Terminate */
733 SIGNAL(SIGCHLD, chld);
735 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
736 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
739 * Install a handler for other signals which would otherwise
740 * cause pppd to exit without cleaning up.
742 SIGNAL(SIGABRT, bad_signal);
743 SIGNAL(SIGALRM, bad_signal);
744 SIGNAL(SIGFPE, bad_signal);
745 SIGNAL(SIGILL, bad_signal);
746 SIGNAL(SIGPIPE, bad_signal);
747 SIGNAL(SIGQUIT, bad_signal);
748 SIGNAL(SIGSEGV, bad_signal);
750 SIGNAL(SIGBUS, bad_signal);
753 SIGNAL(SIGEMT, bad_signal);
756 SIGNAL(SIGPOLL, bad_signal);
759 SIGNAL(SIGPROF, bad_signal);
762 SIGNAL(SIGSYS, bad_signal);
765 SIGNAL(SIGTRAP, bad_signal);
768 SIGNAL(SIGVTALRM, bad_signal);
771 SIGNAL(SIGXCPU, bad_signal);
774 SIGNAL(SIGXFSZ, bad_signal);
778 * Apparently we can get a SIGPIPE when we call syslog, if
779 * syslogd has died and been restarted. Ignoring it seems
782 signal(SIGPIPE, SIG_IGN);
786 * set_ifunit - do things we need to do once we know which ppp
793 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
794 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
795 script_setenv("IFNAME", ifname, iskey);
797 create_pidfile(); /* write pid to file */
798 create_linkpidfile();
803 * detach - detach us from the controlling terminal.
813 if ((pid = fork()) < 0) {
814 error("Couldn't detach (fork failed: %m)");
815 die(1); /* or just return? */
819 notify(pidchange, pid);
820 exit(0); /* parent dies */
828 if (!log_to_file && !log_to_specific_fd)
830 /* update pid files if they have been written already */
834 create_linkpidfile();
835 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
836 script_setenv("PPPD_PID", numbuf, 1);
840 * reopen_log - (re)open our connection to syslog.
846 openlog("pppd", LOG_PID);
848 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
849 setlogmask(LOG_UPTO(LOG_INFO));
854 * Create a file containing our process ID.
861 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
862 _PATH_VARRUN, ifname);
863 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
864 fprintf(pidfile, "%d\n", getpid());
865 (void) fclose(pidfile);
867 error("Failed to create pid file %s: %m", pidfilename);
877 if (linkname[0] == 0)
879 script_setenv("LINKNAME", linkname, 1);
880 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
881 _PATH_VARRUN, linkname);
882 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
883 fprintf(pidfile, "%d\n", getpid());
885 fprintf(pidfile, "%s\n", ifname);
886 (void) fclose(pidfile);
888 error("Failed to create pid file %s: %m", linkpidfile);
894 * holdoff_end - called via a timeout when the holdoff period ends.
900 new_phase(PHASE_DORMANT);
903 /* List of protocol names, to make our messages a little more informative. */
904 struct protocol_list {
907 } protocol_list[] = {
909 { 0x23, "OSI Network Layer" },
910 { 0x25, "Xerox NS IDP" },
911 { 0x27, "DECnet Phase IV" },
912 { 0x29, "Appletalk" },
913 { 0x2b, "Novell IPX" },
914 { 0x2d, "VJ compressed TCP/IP" },
915 { 0x2f, "VJ uncompressed TCP/IP" },
916 { 0x31, "Bridging PDU" },
917 { 0x33, "Stream Protocol ST-II" },
918 { 0x35, "Banyan Vines" },
919 { 0x39, "AppleTalk EDDP" },
920 { 0x3b, "AppleTalk SmartBuffered" },
921 { 0x3d, "Multi-Link" },
922 { 0x3f, "NETBIOS Framing" },
923 { 0x41, "Cisco Systems" },
924 { 0x43, "Ascom Timeplex" },
925 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
926 { 0x47, "DCA Remote Lan" },
927 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
928 { 0x4b, "SNA over 802.2" },
930 { 0x4f, "IP6 Header Compression" },
931 { 0x6f, "Stampede Bridging" },
932 { 0xfb, "single-link compression" },
933 { 0xfd, "1st choice compression" },
934 { 0x0201, "802.1d Hello Packets" },
935 { 0x0203, "IBM Source Routing BPDU" },
936 { 0x0205, "DEC LANBridge100 Spanning Tree" },
937 { 0x0231, "Luxcom" },
938 { 0x0233, "Sigma Network Systems" },
939 { 0x8021, "Internet Protocol Control Protocol" },
940 { 0x8023, "OSI Network Layer Control Protocol" },
941 { 0x8025, "Xerox NS IDP Control Protocol" },
942 { 0x8027, "DECnet Phase IV Control Protocol" },
943 { 0x8029, "Appletalk Control Protocol" },
944 { 0x802b, "Novell IPX Control Protocol" },
945 { 0x8031, "Bridging NCP" },
946 { 0x8033, "Stream Protocol Control Protocol" },
947 { 0x8035, "Banyan Vines Control Protocol" },
948 { 0x803d, "Multi-Link Control Protocol" },
949 { 0x803f, "NETBIOS Framing Control Protocol" },
950 { 0x8041, "Cisco Systems Control Protocol" },
951 { 0x8043, "Ascom Timeplex" },
952 { 0x8045, "Fujitsu LBLB Control Protocol" },
953 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
954 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
955 { 0x804b, "SNA over 802.2 Control Protocol" },
956 { 0x804d, "SNA Control Protocol" },
957 { 0x804f, "IP6 Header Compression Control Protocol" },
958 { 0x006f, "Stampede Bridging Control Protocol" },
959 { 0x80fb, "Single Link Compression Control Protocol" },
960 { 0x80fd, "Compression Control Protocol" },
961 { 0xc021, "Link Control Protocol" },
962 { 0xc023, "Password Authentication Protocol" },
963 { 0xc025, "Link Quality Report" },
964 { 0xc027, "Shiva Password Authentication Protocol" },
965 { 0xc029, "CallBack Control Protocol (CBCP)" },
966 { 0xc081, "Container Control Protocol" },
967 { 0xc223, "Challenge Handshake Authentication Protocol" },
968 { 0xc281, "Proprietary Authentication Protocol" },
973 * protocol_name - find a name for a PPP protocol.
979 struct protocol_list *lp;
981 for (lp = protocol_list; lp->proto != 0; ++lp)
982 if (proto == lp->proto)
988 * get_input - called when incoming data is available.
996 struct protent *protp;
998 p = inpacket_buf; /* point to beginning of packet buffer */
1000 len = read_packet(inpacket_buf);
1005 notice("Modem hangup");
1007 status = EXIT_HANGUP;
1008 lcp_lowerdown(0); /* serial link is no longer available */
1013 if (debug /*&& (debugflags & DBG_INPACKET)*/)
1014 dbglog("rcvd %P", p, len);
1016 if (len < PPP_HDRLEN) {
1017 MAINDEBUG(("io(): Received short packet."));
1021 p += 2; /* Skip address and control */
1022 GETSHORT(protocol, p);
1026 * Toss all non-LCP packets unless LCP is OPEN.
1028 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1029 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
1034 * Until we get past the authentication phase, toss all packets
1035 * except LCP, LQR and authentication packets.
1037 if (phase <= PHASE_AUTHENTICATE
1038 && !(protocol == PPP_LCP || protocol == PPP_LQR
1039 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
1040 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
1046 * Upcall the proper protocol input routine.
1048 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1049 if (protp->protocol == protocol && protp->enabled_flag) {
1050 (*protp->input)(0, p, len);
1053 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1054 && protp->datainput != NULL) {
1055 (*protp->datainput)(0, p, len);
1061 const char *pname = protocol_name(protocol);
1063 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1065 warn("Unsupported protocol 0x%x received", protocol);
1067 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1071 * new_phase - signal the start of a new phase of pppd's operation.
1079 (*new_phase_hook)(p);
1080 notify(phasechange, p);
1084 * die - clean up state and exit with the specified status.
1091 notify(exitnotify, status);
1092 syslog(LOG_INFO, "Exit.");
1097 * cleanup - restore anything which needs to be restored before we exit
1106 disestablish_ppp(devfd);
1109 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1110 warn("unable to delete pid file %s: %m", pidfilename);
1112 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1113 warn("unable to delete pid file %s: %m", linkpidfile);
1121 * update_link_stats - get stats at link termination.
1124 update_link_stats(u)
1130 if (!get_ppp_stats(u, &link_stats)
1131 || gettimeofday(&now, NULL) < 0)
1133 link_connect_time = now.tv_sec - start_time.tv_sec;
1134 link_stats_valid = 1;
1136 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1137 script_setenv("CONNECT_TIME", numbuf, 0);
1138 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1139 script_setenv("BYTES_SENT", numbuf, 0);
1140 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1141 script_setenv("BYTES_RCVD", numbuf, 0);
1146 struct timeval c_time; /* time at which to call routine */
1147 void *c_arg; /* argument to routine */
1148 void (*c_func) __P((void *)); /* routine */
1149 struct callout *c_next;
1152 static struct callout *callout = NULL; /* Callout list */
1153 static struct timeval timenow; /* Current time */
1156 * timeout - Schedule a timeout.
1158 * Note that this timeout takes the number of seconds, NOT hz (as in
1162 timeout(func, arg, time)
1163 void (*func) __P((void *));
1167 struct callout *newp, *p, **pp;
1169 MAINDEBUG(("Timeout %p:%p in %d seconds.", func, arg, time));
1174 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1175 fatal("Out of memory in timeout()!");
1177 newp->c_func = func;
1178 gettimeofday(&timenow, NULL);
1179 newp->c_time.tv_sec = timenow.tv_sec + time;
1180 newp->c_time.tv_usec = timenow.tv_usec;
1183 * Find correct place and link it in.
1185 for (pp = &callout; (p = *pp); pp = &p->c_next)
1186 if (newp->c_time.tv_sec < p->c_time.tv_sec
1187 || (newp->c_time.tv_sec == p->c_time.tv_sec
1188 && newp->c_time.tv_usec < p->c_time.tv_usec))
1196 * untimeout - Unschedule a timeout.
1199 untimeout(func, arg)
1200 void (*func) __P((void *));
1203 struct callout **copp, *freep;
1205 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1208 * Find first matching timeout and remove it from the list.
1210 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1211 if (freep->c_func == func && freep->c_arg == arg) {
1212 *copp = freep->c_next;
1213 free((char *) freep);
1220 * calltimeout - Call any timeout routines which are now due.
1227 while (callout != NULL) {
1230 if (gettimeofday(&timenow, NULL) < 0)
1231 fatal("Failed to get time of day: %m");
1232 if (!(p->c_time.tv_sec < timenow.tv_sec
1233 || (p->c_time.tv_sec == timenow.tv_sec
1234 && p->c_time.tv_usec <= timenow.tv_usec)))
1235 break; /* no, it's not time yet */
1237 callout = p->c_next;
1238 (*p->c_func)(p->c_arg);
1246 * timeleft - return the length of time until the next timeout is due.
1248 static struct timeval *
1250 struct timeval *tvp;
1252 if (callout == NULL)
1255 gettimeofday(&timenow, NULL);
1256 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1257 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1258 if (tvp->tv_usec < 0) {
1259 tvp->tv_usec += 1000000;
1262 if (tvp->tv_sec < 0)
1263 tvp->tv_sec = tvp->tv_usec = 0;
1270 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1276 struct sigaction act, oldact;
1278 act.sa_handler = SIG_IGN;
1281 sigaction(sig, &act, &oldact);
1282 sigaction(sig, &oldact, NULL);
1287 * hup - Catch SIGHUP signal.
1289 * Indicates that the physical layer has been disconnected.
1290 * We don't rely on this indication; if the user has sent this
1291 * signal, we just take the link down.
1297 info("Hangup (SIGHUP)");
1299 if (status != EXIT_HANGUP)
1300 status = EXIT_USER_REQUEST;
1302 /* Send the signal to the [dis]connector process(es) also */
1304 notify(sigreceived, sig);
1306 siglongjmp(sigjmp, 1);
1311 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1313 * Indicates that we should initiate a graceful disconnect and exit.
1320 info("Terminating on signal %d.", sig);
1321 persist = 0; /* don't try to restart */
1323 status = EXIT_USER_REQUEST;
1325 /* Send the signal to the [dis]connector process(es) also */
1327 notify(sigreceived, sig);
1329 siglongjmp(sigjmp, 1);
1334 * chld - Catch SIGCHLD signal.
1335 * Sets a flag so we will call reap_kids in the mainline.
1343 siglongjmp(sigjmp, 1);
1348 * toggle_debug - Catch SIGUSR1 signal.
1350 * Toggle debug flag.
1359 setlogmask(LOG_UPTO(LOG_DEBUG));
1361 setlogmask(LOG_UPTO(LOG_WARNING));
1367 * open_ccp - Catch SIGUSR2 signal.
1369 * Try to (re)negotiate compression.
1378 siglongjmp(sigjmp, 1);
1383 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1389 static int crashed = 0;
1394 error("Fatal signal %d", sig);
1396 kill_my_pg(SIGTERM);
1397 notify(sigreceived, sig);
1403 * device_script - run a program to talk to the specified fds
1404 * (e.g. to run the connector or disconnector script).
1405 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1408 device_script(program, in, out, dont_wait)
1422 error("Failed to create child process: %m");
1428 record_child(pid, program, NULL, NULL);
1431 while (waitpid(pid, &status, 0) < 0) {
1434 fatal("error waiting for (dis)connection process: %m");
1438 return (status == 0 ? 0 : -1);
1441 /* here we are executing in the child */
1442 /* make sure fds 0, 1, 2 are occupied */
1443 while ((fd = dup(in)) >= 0) {
1450 /* dup in and out to fds > 2 */
1453 if (log_to_fd >= 0) {
1454 errfd = dup(log_to_fd);
1456 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1459 /* close fds 0 - 2 and any others we can think of */
1467 /* dup the in, out, err fds to 0, 1, 2 */
1478 if (getuid() != uid) {
1479 error("setuid failed");
1483 execl("/bin/sh", "sh", "-c", program, (char *)0);
1484 error("could not exec /bin/sh: %m");
1491 * run-program - execute a program with given arguments,
1492 * but don't wait for it.
1493 * If the program can't be executed, logs an error unless
1494 * must_exist is 0 and the program file doesn't exist.
1495 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1496 * or isn't an executable plain file, or the process ID of the child.
1497 * If done != NULL, (*done)(arg) will be called later (within
1498 * reap_kids) iff the return value is > 0.
1501 run_program(prog, args, must_exist, done, arg)
1505 void (*done) __P((void *));
1512 * First check if the file exists and is executable.
1513 * We don't use access() because that would use the
1514 * real user-id, which might not be root, and the script
1515 * might be accessible only to root.
1518 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1519 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1520 if (must_exist || errno != ENOENT)
1521 warn("Can't execute %s: %m", prog);
1527 error("Failed to create child process for %s: %m", prog);
1533 /* Leave the current location */
1534 (void) setsid(); /* No controlling tty. */
1535 (void) umask (S_IRWXG|S_IRWXO);
1536 (void) chdir ("/"); /* no current directory. */
1537 setuid(0); /* set real UID = root */
1540 /* Ensure that nothing of our device environment is inherited. */
1548 /* Don't pass handles to the PPP device, even by accident. */
1549 new_fd = open (_PATH_DEVNULL, O_RDWR);
1552 dup2 (new_fd, 0); /* stdin <- /dev/null */
1555 dup2 (0, 1); /* stdout -> /dev/null */
1556 dup2 (0, 2); /* stderr -> /dev/null */
1560 /* Force the priority back to zero if pppd is running higher. */
1561 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1562 warn("can't reset priority to 0: %m");
1565 /* SysV recommends a second fork at this point. */
1567 /* run the program */
1568 execve(prog, args, script_env);
1569 if (must_exist || errno != ENOENT) {
1570 /* have to reopen the log, there's nowhere else
1571 for the message to go. */
1573 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1580 dbglog("Script %s started (pid %d)", prog, pid);
1581 record_child(pid, prog, done, arg);
1588 * record_child - add a child process to the list for reap_kids
1592 record_child(pid, prog, done, arg)
1595 void (*done) __P((void *));
1598 struct subprocess *chp;
1602 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1604 warn("losing track of %s process", prog);
1610 chp->next = children;
1617 * reap_kids - get status from any dead child processes,
1618 * and log a message for abnormal terminations.
1625 struct subprocess *chp, **prevp;
1628 if (n_children == 0)
1630 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1632 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1633 if (chp->pid == pid) {
1639 if (WIFSIGNALED(status)) {
1640 warn("Child process %s (pid %d) terminated with signal %d",
1641 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1643 dbglog("Script %s finished (pid %d), status = 0x%x",
1644 (chp? chp->prog: "??"), pid, status);
1645 if (chp && chp->done)
1646 (*chp->done)(chp->arg);
1651 if (errno == ECHILD)
1654 error("Error waiting for child process: %m");
1660 * add_notifier - add a new function to be called when something happens.
1663 add_notifier(notif, func, arg)
1664 struct notifier **notif;
1668 struct notifier *np;
1670 np = malloc(sizeof(struct notifier));
1672 novm("notifier struct");
1680 * remove_notifier - remove a function from the list of things to
1681 * be called when something happens.
1684 remove_notifier(notif, func, arg)
1685 struct notifier **notif;
1689 struct notifier *np;
1691 for (; (np = *notif) != 0; notif = &np->next) {
1692 if (np->func == func && np->arg == arg) {
1701 * notify - call a set of functions registered with add_notify.
1705 struct notifier *notif;
1708 struct notifier *np;
1710 while ((np = notif) != 0) {
1712 (*np->func)(np->arg, val);
1717 * novm - log an error message saying we ran out of memory, and die.
1723 fatal("Virtual memory exhausted allocating %s\n", msg);
1727 * script_setenv - set an environment variable value to be used
1728 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1731 script_setenv(var, value, iskey)
1735 size_t varl = strlen(var);
1736 size_t vl = varl + strlen(value) + 2;
1738 char *p, *newstring;
1740 newstring = (char *) malloc(vl+1);
1743 *newstring++ = iskey;
1744 slprintf(newstring, vl, "%s=%s", var, value);
1746 /* check if this variable is already set */
1747 if (script_env != 0) {
1748 for (i = 0; (p = script_env[i]) != 0; ++i) {
1749 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1750 if (p[-1] && pppdb != NULL)
1753 script_env[i] = newstring;
1754 if (iskey && pppdb != NULL)
1755 add_db_key(newstring);
1761 /* no space allocated for script env. ptrs. yet */
1763 script_env = (char **) malloc(16 * sizeof(char *));
1764 if (script_env == 0)
1769 /* reallocate script_env with more space if needed */
1770 if (i + 1 >= s_env_nalloc) {
1772 char **newenv = (char **) realloc((void *)script_env,
1773 new_n * sizeof(char *));
1776 script_env = newenv;
1777 s_env_nalloc = new_n;
1780 script_env[i] = newstring;
1781 script_env[i+1] = 0;
1783 if (pppdb != NULL) {
1785 add_db_key(newstring);
1791 * script_unsetenv - remove a variable from the environment
1795 script_unsetenv(var)
1798 int vl = strlen(var);
1802 if (script_env == 0)
1804 for (i = 0; (p = script_env[i]) != 0; ++i) {
1805 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1806 if (p[-1] && pppdb != NULL)
1809 while ((script_env[i] = script_env[i+1]) != 0)
1819 * update_db_entry - update our entry in the database.
1828 if (script_env == NULL)
1831 for (i = 0; (p = script_env[i]) != 0; ++i)
1832 vlen += strlen(p) + 1;
1833 vbuf = malloc(vlen);
1835 novm("database entry");
1837 for (i = 0; (p = script_env[i]) != 0; ++i)
1838 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1841 key.dsize = strlen(db_key);
1844 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1845 error("tdb_store failed: %s", tdb_error(pppdb));
1850 * add_db_key - add a key that we can use to look up our database entry.
1858 key.dptr = (char *) str;
1859 key.dsize = strlen(str);
1861 dbuf.dsize = strlen(db_key);
1862 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1863 error("tdb_store key failed: %s", tdb_error(pppdb));
1867 * delete_db_key - delete a key for looking up our database entry.
1875 key.dptr = (char *) str;
1876 key.dsize = strlen(str);
1877 tdb_delete(pppdb, key);
1881 * cleanup_db - delete all the entries we put in the database.
1891 key.dsize = strlen(db_key);
1892 tdb_delete(pppdb, key);
1893 for (i = 0; (p = script_env[i]) != 0; ++i)