2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name "Carnegie Mellon University" must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission. For permission or any legal
21 * details, please contact
22 * Office of Technology Transfer
23 * Carnegie Mellon University
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
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31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
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36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
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39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43 #define RCSID "$Id: main.c,v 1.123 2003/03/03 05:11:46 paulus Exp $"
58 #include <sys/param.h>
59 #include <sys/types.h>
62 #include <sys/resource.h>
64 #include <sys/socket.h>
65 #include <netinet/in.h>
66 #include <arpa/inet.h>
81 #include "pathnames.h"
93 #endif /* IPX_CHANGE */
98 static const char rcsid[] = RCSID;
101 char ifname[32]; /* Interface name */
102 int ifunit; /* Interface unit number */
104 struct channel *the_channel;
106 char *progname; /* Name of this program */
107 char hostname[MAXNAMELEN]; /* Our hostname */
108 static char pidfilename[MAXPATHLEN]; /* name of pid file */
109 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
110 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
111 uid_t uid; /* Our real user-id */
112 struct notifier *pidchange = NULL;
113 struct notifier *phasechange = NULL;
114 struct notifier *exitnotify = NULL;
115 struct notifier *sigreceived = NULL;
116 struct notifier *fork_notifier = NULL;
118 int hungup; /* terminal has been hung up */
119 int privileged; /* we're running as real uid root */
120 int need_holdoff; /* need holdoff period before restarting */
121 int detached; /* have detached from terminal */
122 volatile int status; /* exit status for pppd */
123 int unsuccess; /* # unsuccessful connection attempts */
124 int do_callback; /* != 0 if we should do callback next */
125 int doing_callback; /* != 0 if we are doing callback */
126 int ppp_session_number; /* Session number, for channels with such a
127 concept (eg PPPoE) */
129 TDB_CONTEXT *pppdb; /* database for storing status etc. */
134 int (*holdoff_hook) __P((void)) = NULL;
135 int (*new_phase_hook) __P((int)) = NULL;
136 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
137 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
139 static int conn_running; /* we have a [dis]connector running */
140 static int devfd; /* fd of underlying device */
141 static int fd_ppp = -1; /* fd for talking PPP */
142 static int fd_loop; /* fd for getting demand-dial packets */
143 static int fd_devnull; /* fd for /dev/null */
145 int phase; /* where the link is at */
154 static sigjmp_buf sigjmp;
156 char **script_env; /* Env. variable values for scripts */
157 int s_env_nalloc; /* # words avail at script_env */
159 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
160 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
162 static int n_children; /* # child processes still running */
163 static int got_sigchld; /* set if we have received a SIGCHLD */
165 int privopen; /* don't lock, open device as root */
167 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
169 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
170 int ngroups; /* How many groups valid in groups */
172 static struct timeval start_time; /* Time when link was started. */
174 struct pppd_stats link_stats;
175 unsigned link_connect_time;
176 int link_stats_valid;
179 * We maintain a list of child process pids and
180 * functions to call when they exit.
185 void (*done) __P((void *));
187 struct subprocess *next;
190 static struct subprocess *children;
192 /* Prototypes for procedures local to this file. */
194 static void setup_signals __P((void));
195 static void create_pidfile __P((int pid));
196 static void create_linkpidfile __P((int pid));
197 static void cleanup __P((void));
198 static void get_input __P((void));
199 static void calltimeout __P((void));
200 static struct timeval *timeleft __P((struct timeval *));
201 static void kill_my_pg __P((int));
202 static void hup __P((int));
203 static void term __P((int));
204 static void chld __P((int));
205 static void toggle_debug __P((int));
206 static void open_ccp __P((int));
207 static void bad_signal __P((int));
208 static void holdoff_end __P((void *));
209 static int reap_kids __P((int waitfor));
212 static void update_db_entry __P((void));
213 static void add_db_key __P((const char *));
214 static void delete_db_key __P((const char *));
215 static void cleanup_db __P((void));
218 static void handle_events __P((void));
219 static void print_link_stats __P((void));
221 extern char *ttyname __P((int));
222 extern char *getlogin __P((void));
223 int main __P((int, char *[]));
227 #define O_NONBLOCK O_NDELAY
231 #define setlogmask(x)
235 * PPP Data Link Layer "protocol" table.
236 * One entry per supported protocol.
237 * The last entry must be NULL.
239 struct protent *protocols[] = {
263 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
265 #if !defined(PPP_DRV_NAME)
266 #define PPP_DRV_NAME "ppp"
267 #endif /* !defined(PPP_DRV_NAME) */
277 struct protent *protp;
280 link_stats_valid = 0;
281 new_phase(PHASE_INITIALIZE);
285 /* Initialize syslog facilities */
288 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
289 option_error("Couldn't get hostname: %m");
292 hostname[MAXNAMELEN-1] = 0;
294 /* make sure we don't create world or group writable files. */
295 umask(umask(0777) | 022);
298 privileged = uid == 0;
299 slprintf(numbuf, sizeof(numbuf), "%d", uid);
300 script_setenv("ORIG_UID", numbuf, 0);
302 ngroups = getgroups(NGROUPS_MAX, groups);
305 * Initialize magic number generator now so that protocols may
306 * use magic numbers in initialization.
311 * Initialize each protocol.
313 for (i = 0; (protp = protocols[i]) != NULL; ++i)
317 * Initialize the default channel.
324 * Parse, in order, the system options file, the user's options file,
325 * and the command line arguments.
327 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
328 || !options_from_user()
329 || !parse_args(argc-1, argv+1))
330 exit(EXIT_OPTION_ERROR);
331 devnam_fixed = 1; /* can no longer change device name */
334 * Work out the device name, if it hasn't already been specified,
335 * and parse the tty's options file.
337 if (the_channel->process_extra_options)
338 (*the_channel->process_extra_options)();
341 setlogmask(LOG_UPTO(LOG_DEBUG));
344 * Check that we are running as root.
346 if (geteuid() != 0) {
347 option_error("must be root to run %s, since it is not setuid-root",
352 if (!ppp_available()) {
353 option_error("%s", no_ppp_msg);
354 exit(EXIT_NO_KERNEL_SUPPORT);
358 * Check that the options given are valid and consistent.
361 if (!sys_check_options())
362 exit(EXIT_OPTION_ERROR);
363 auth_check_options();
364 #ifdef HAVE_MULTILINK
367 for (i = 0; (protp = protocols[i]) != NULL; ++i)
368 if (protp->check_options != NULL)
369 (*protp->check_options)();
370 if (the_channel->check_options)
371 (*the_channel->check_options)();
374 if (dump_options || dryrun) {
375 init_pr_log(NULL, LOG_INFO);
376 print_options(pr_log, NULL);
384 * Initialize system-dependent stuff.
388 /* Make sure fds 0, 1, 2 are open to somewhere. */
389 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
391 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
392 while (fd_devnull <= 2) {
395 fatal("Critical shortage of file descriptors: dup failed: %m");
400 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
402 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
405 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
407 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 started by %s, uid %d", VERSION, p, uid);
428 script_setenv("PPPLOGNAME", p, 0);
431 script_setenv("DEVICE", devnam, 1);
432 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
433 script_setenv("PPPD_PID", numbuf, 1);
439 create_linkpidfile(getpid());
442 * If we're doing dial-on-demand, set up the interface now.
446 * Open the loopback channel and set it up to be the ppp interface.
449 tdb_writelock(pppdb);
451 fd_loop = open_ppp_loopback();
454 tdb_writeunlock(pppdb);
457 * Configure the interface and mark it up, etc.
470 doing_callback = do_callback;
473 if (demand && !doing_callback) {
475 * Don't do anything until we see some activity.
477 new_phase(PHASE_DORMANT);
482 if (kill_link && !persist)
484 if (get_loop_output())
488 if (kill_link && !persist)
492 * Now we want to bring up the link.
495 info("Starting link");
498 new_phase(PHASE_SERIALCONN);
500 devfd = the_channel->connect();
504 /* set up the serial device as a ppp interface */
506 tdb_writelock(pppdb);
508 fd_ppp = the_channel->establish_ppp(devfd);
511 tdb_writeunlock(pppdb);
513 status = EXIT_FATAL_ERROR;
517 if (!demand && ifunit >= 0)
520 tdb_writeunlock(pppdb);
524 * Start opening the connection and wait for
525 * incoming events (reply, timeout, etc.).
528 notice("Connect: %s <--> %s", ifname, ppp_devnam);
530 notice("Starting negotiation on %s", ppp_devnam);
531 gettimeofday(&start_time, NULL);
532 script_unsetenv("CONNECT_TIME");
533 script_unsetenv("BYTES_SENT");
534 script_unsetenv("BYTES_RCVD");
538 lcp_open(0); /* Start protocol */
539 status = EXIT_NEGOTIATION_FAILED;
540 new_phase(PHASE_ESTABLISH);
541 while (phase != PHASE_DEAD) {
545 lcp_close(0, "User request");
547 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
548 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
549 (*ccp_protent.open)(0);
557 * Delete pid file before disestablishing ppp. Otherwise it
558 * can happen that another pppd gets the same unit and then
559 * we delete its pid file.
562 if (pidfilename[0] != 0
563 && unlink(pidfilename) < 0 && errno != ENOENT)
564 warn("unable to delete pid file %s: %m", pidfilename);
569 * If we may want to bring the link up again, transfer
570 * the ppp unit back to the loopback. Set the
571 * real serial device back to its normal mode of operation.
575 the_channel->disestablish_ppp(devfd);
580 script_unsetenv("IFNAME");
583 * Run disconnector script, if requested.
584 * XXX we may not be able to do this if the line has hung up!
587 new_phase(PHASE_DISCONNECT);
588 the_channel->disconnect();
591 if (the_channel->cleanup)
592 (*the_channel->cleanup)();
595 if (pidfilename[0] != 0
596 && unlink(pidfilename) < 0 && errno != ENOENT)
597 warn("unable to delete pid file %s: %m", pidfilename);
601 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
606 t = need_holdoff? holdoff: 0;
608 t = (*holdoff_hook)();
610 new_phase(PHASE_HOLDOFF);
611 TIMEOUT(holdoff_end, NULL, t);
615 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
616 } while (phase == PHASE_HOLDOFF);
622 /* Wait for scripts to finish */
623 /* XXX should have a timeout here */
624 while (n_children > 0) {
626 struct subprocess *chp;
627 dbglog("Waiting for %d child processes...", n_children);
628 for (chp = children; chp != NULL; chp = chp->next)
629 dbglog(" script %s, pid %d", chp->prog, chp->pid);
631 if (reap_kids(1) < 0)
640 * handle_events - wait for something to happen and respond to it.
648 kill_link = open_ccp_flag = 0;
649 if (sigsetjmp(sigjmp, 1) == 0) {
650 sigprocmask(SIG_BLOCK, &mask, NULL);
651 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
652 sigprocmask(SIG_UNBLOCK, &mask, NULL);
655 sigprocmask(SIG_UNBLOCK, &mask, NULL);
656 wait_input(timeleft(&timo));
664 if (status != EXIT_HANGUP)
665 status = EXIT_USER_REQUEST;
670 status = EXIT_USER_REQUEST;
674 reap_kids(0); /* Don't leave dead kids lying around */
684 * setup_signals - initialize signal handling.
693 * Compute mask of all interesting signals and install signal handlers
694 * for each. Only one signal handler may be active at a time. Therefore,
695 * all other signals should be masked when any handler is executing.
698 sigaddset(&mask, SIGHUP);
699 sigaddset(&mask, SIGINT);
700 sigaddset(&mask, SIGTERM);
701 sigaddset(&mask, SIGCHLD);
702 sigaddset(&mask, SIGUSR2);
704 #define SIGNAL(s, handler) do { \
705 sa.sa_handler = handler; \
706 if (sigaction(s, &sa, NULL) < 0) \
707 fatal("Couldn't establish signal handler (%d): %m", s); \
712 SIGNAL(SIGHUP, hup); /* Hangup */
713 SIGNAL(SIGINT, term); /* Interrupt */
714 SIGNAL(SIGTERM, term); /* Terminate */
715 SIGNAL(SIGCHLD, chld);
717 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
718 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
721 * Install a handler for other signals which would otherwise
722 * cause pppd to exit without cleaning up.
724 SIGNAL(SIGABRT, bad_signal);
725 SIGNAL(SIGALRM, bad_signal);
726 SIGNAL(SIGFPE, bad_signal);
727 SIGNAL(SIGILL, bad_signal);
728 SIGNAL(SIGPIPE, bad_signal);
729 SIGNAL(SIGQUIT, bad_signal);
730 SIGNAL(SIGSEGV, bad_signal);
732 SIGNAL(SIGBUS, bad_signal);
735 SIGNAL(SIGEMT, bad_signal);
738 SIGNAL(SIGPOLL, bad_signal);
741 SIGNAL(SIGPROF, bad_signal);
744 SIGNAL(SIGSYS, bad_signal);
747 SIGNAL(SIGTRAP, bad_signal);
750 SIGNAL(SIGVTALRM, bad_signal);
753 SIGNAL(SIGXCPU, bad_signal);
756 SIGNAL(SIGXFSZ, bad_signal);
760 * Apparently we can get a SIGPIPE when we call syslog, if
761 * syslogd has died and been restarted. Ignoring it seems
764 signal(SIGPIPE, SIG_IGN);
768 * set_ifunit - do things we need to do once we know which ppp
775 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
776 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
777 script_setenv("IFNAME", ifname, iskey);
779 create_pidfile(getpid()); /* write pid to file */
780 create_linkpidfile(getpid());
785 * detach - detach us from the controlling terminal.
796 if (pipe(pipefd) == -1)
797 pipefd[0] = pipefd[1] = -1;
798 if ((pid = fork()) < 0) {
799 error("Couldn't detach (fork failed: %m)");
800 die(1); /* or just return? */
804 notify(pidchange, pid);
805 /* update pid files if they have been written already */
809 create_linkpidfile(pid);
810 exit(0); /* parent dies */
820 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
821 script_setenv("PPPD_PID", numbuf, 1);
823 /* wait for parent to finish updating pid & lock files and die */
825 read(pipefd[0], numbuf, 1);
830 * reopen_log - (re)open our connection to syslog.
836 openlog("pppd", LOG_PID);
838 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
839 setlogmask(LOG_UPTO(LOG_INFO));
844 * Create a file containing our process ID.
852 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
853 _PATH_VARRUN, ifname);
854 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
855 fprintf(pidfile, "%d\n", getpid());
856 (void) fclose(pidfile);
858 error("Failed to create pid file %s: %m", pidfilename);
864 create_linkpidfile(pid)
869 if (linkname[0] == 0)
871 script_setenv("LINKNAME", linkname, 1);
872 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
873 _PATH_VARRUN, linkname);
874 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
875 fprintf(pidfile, "%d\n", getpid());
877 fprintf(pidfile, "%s\n", ifname);
878 (void) fclose(pidfile);
880 error("Failed to create pid file %s: %m", linkpidfile);
886 * holdoff_end - called via a timeout when the holdoff period ends.
892 new_phase(PHASE_DORMANT);
895 /* List of protocol names, to make our messages a little more informative. */
896 struct protocol_list {
899 } protocol_list[] = {
901 { 0x23, "OSI Network Layer" },
902 { 0x25, "Xerox NS IDP" },
903 { 0x27, "DECnet Phase IV" },
904 { 0x29, "Appletalk" },
905 { 0x2b, "Novell IPX" },
906 { 0x2d, "VJ compressed TCP/IP" },
907 { 0x2f, "VJ uncompressed TCP/IP" },
908 { 0x31, "Bridging PDU" },
909 { 0x33, "Stream Protocol ST-II" },
910 { 0x35, "Banyan Vines" },
911 { 0x39, "AppleTalk EDDP" },
912 { 0x3b, "AppleTalk SmartBuffered" },
913 { 0x3d, "Multi-Link" },
914 { 0x3f, "NETBIOS Framing" },
915 { 0x41, "Cisco Systems" },
916 { 0x43, "Ascom Timeplex" },
917 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
918 { 0x47, "DCA Remote Lan" },
919 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
920 { 0x4b, "SNA over 802.2" },
922 { 0x4f, "IP6 Header Compression" },
923 { 0x6f, "Stampede Bridging" },
924 { 0xfb, "single-link compression" },
925 { 0xfd, "1st choice compression" },
926 { 0x0201, "802.1d Hello Packets" },
927 { 0x0203, "IBM Source Routing BPDU" },
928 { 0x0205, "DEC LANBridge100 Spanning Tree" },
929 { 0x0231, "Luxcom" },
930 { 0x0233, "Sigma Network Systems" },
931 { 0x8021, "Internet Protocol Control Protocol" },
932 { 0x8023, "OSI Network Layer Control Protocol" },
933 { 0x8025, "Xerox NS IDP Control Protocol" },
934 { 0x8027, "DECnet Phase IV Control Protocol" },
935 { 0x8029, "Appletalk Control Protocol" },
936 { 0x802b, "Novell IPX Control Protocol" },
937 { 0x8031, "Bridging NCP" },
938 { 0x8033, "Stream Protocol Control Protocol" },
939 { 0x8035, "Banyan Vines Control Protocol" },
940 { 0x803d, "Multi-Link Control Protocol" },
941 { 0x803f, "NETBIOS Framing Control Protocol" },
942 { 0x8041, "Cisco Systems Control Protocol" },
943 { 0x8043, "Ascom Timeplex" },
944 { 0x8045, "Fujitsu LBLB Control Protocol" },
945 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
946 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
947 { 0x804b, "SNA over 802.2 Control Protocol" },
948 { 0x804d, "SNA Control Protocol" },
949 { 0x804f, "IP6 Header Compression Control Protocol" },
950 { 0x006f, "Stampede Bridging Control Protocol" },
951 { 0x80fb, "Single Link Compression Control Protocol" },
952 { 0x80fd, "Compression Control Protocol" },
953 { 0xc021, "Link Control Protocol" },
954 { 0xc023, "Password Authentication Protocol" },
955 { 0xc025, "Link Quality Report" },
956 { 0xc027, "Shiva Password Authentication Protocol" },
957 { 0xc029, "CallBack Control Protocol (CBCP)" },
958 { 0xc081, "Container Control Protocol" },
959 { 0xc223, "Challenge Handshake Authentication Protocol" },
960 { 0xc281, "Proprietary Authentication Protocol" },
965 * protocol_name - find a name for a PPP protocol.
971 struct protocol_list *lp;
973 for (lp = protocol_list; lp->proto != 0; ++lp)
974 if (proto == lp->proto)
980 * get_input - called when incoming data is available.
988 struct protent *protp;
990 p = inpacket_buf; /* point to beginning of packet buffer */
992 len = read_packet(inpacket_buf);
997 notice("Modem hangup");
999 status = EXIT_HANGUP;
1000 lcp_lowerdown(0); /* serial link is no longer available */
1005 if (len < PPP_HDRLEN) {
1006 dbglog("received short packet:%.*B", len, p);
1010 dump_packet("rcvd", p, len);
1011 if (snoop_recv_hook) snoop_recv_hook(p, len);
1013 p += 2; /* Skip address and control */
1014 GETSHORT(protocol, p);
1018 * Toss all non-LCP packets unless LCP is OPEN.
1020 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1021 dbglog("Discarded non-LCP packet when LCP not open");
1026 * Until we get past the authentication phase, toss all packets
1027 * except LCP, LQR and authentication packets.
1029 if (phase <= PHASE_AUTHENTICATE
1030 && !(protocol == PPP_LCP || protocol == PPP_LQR
1031 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1032 protocol == PPP_EAP)) {
1033 dbglog("discarding proto 0x%x in phase %d",
1039 * Upcall the proper protocol input routine.
1041 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1042 if (protp->protocol == protocol && protp->enabled_flag) {
1043 (*protp->input)(0, p, len);
1046 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1047 && protp->datainput != NULL) {
1048 (*protp->datainput)(0, p, len);
1054 const char *pname = protocol_name(protocol);
1056 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1058 warn("Unsupported protocol 0x%x received", protocol);
1060 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1064 * new_phase - signal the start of a new phase of pppd's operation.
1072 (*new_phase_hook)(p);
1073 notify(phasechange, p);
1077 * die - clean up state and exit with the specified status.
1085 notify(exitnotify, status);
1086 syslog(LOG_INFO, "Exit.");
1091 * cleanup - restore anything which needs to be restored before we exit
1100 the_channel->disestablish_ppp(devfd);
1101 if (the_channel->cleanup)
1102 (*the_channel->cleanup)();
1104 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1105 warn("unable to delete pid file %s: %m", pidfilename);
1107 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1108 warn("unable to delete pid file %s: %m", linkpidfile);
1122 * Print connect time and statistics.
1124 if (link_stats_valid) {
1125 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1126 info("Connect time %d.%d minutes.", t/10, t%10);
1127 info("Sent %u bytes, received %u bytes.",
1128 link_stats.bytes_out, link_stats.bytes_in);
1133 * update_link_stats - get stats at link termination.
1136 update_link_stats(u)
1142 if (!get_ppp_stats(u, &link_stats)
1143 || gettimeofday(&now, NULL) < 0)
1145 link_connect_time = now.tv_sec - start_time.tv_sec;
1146 link_stats_valid = 1;
1148 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1149 script_setenv("CONNECT_TIME", numbuf, 0);
1150 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1151 script_setenv("BYTES_SENT", numbuf, 0);
1152 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1153 script_setenv("BYTES_RCVD", numbuf, 0);
1158 struct timeval c_time; /* time at which to call routine */
1159 void *c_arg; /* argument to routine */
1160 void (*c_func) __P((void *)); /* routine */
1161 struct callout *c_next;
1164 static struct callout *callout = NULL; /* Callout list */
1165 static struct timeval timenow; /* Current time */
1168 * timeout - Schedule a timeout.
1171 timeout(func, arg, secs, usecs)
1172 void (*func) __P((void *));
1176 struct callout *newp, *p, **pp;
1178 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1184 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1185 fatal("Out of memory in timeout()!");
1187 newp->c_func = func;
1188 gettimeofday(&timenow, NULL);
1189 newp->c_time.tv_sec = timenow.tv_sec + secs;
1190 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1191 if (newp->c_time.tv_usec >= 1000000) {
1192 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1193 newp->c_time.tv_usec %= 1000000;
1197 * Find correct place and link it in.
1199 for (pp = &callout; (p = *pp); pp = &p->c_next)
1200 if (newp->c_time.tv_sec < p->c_time.tv_sec
1201 || (newp->c_time.tv_sec == p->c_time.tv_sec
1202 && newp->c_time.tv_usec < p->c_time.tv_usec))
1210 * untimeout - Unschedule a timeout.
1213 untimeout(func, arg)
1214 void (*func) __P((void *));
1217 struct callout **copp, *freep;
1219 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1222 * Find first matching timeout and remove it from the list.
1224 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1225 if (freep->c_func == func && freep->c_arg == arg) {
1226 *copp = freep->c_next;
1227 free((char *) freep);
1234 * calltimeout - Call any timeout routines which are now due.
1241 while (callout != NULL) {
1244 if (gettimeofday(&timenow, NULL) < 0)
1245 fatal("Failed to get time of day: %m");
1246 if (!(p->c_time.tv_sec < timenow.tv_sec
1247 || (p->c_time.tv_sec == timenow.tv_sec
1248 && p->c_time.tv_usec <= timenow.tv_usec)))
1249 break; /* no, it's not time yet */
1251 callout = p->c_next;
1252 (*p->c_func)(p->c_arg);
1260 * timeleft - return the length of time until the next timeout is due.
1262 static struct timeval *
1264 struct timeval *tvp;
1266 if (callout == NULL)
1269 gettimeofday(&timenow, NULL);
1270 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1271 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1272 if (tvp->tv_usec < 0) {
1273 tvp->tv_usec += 1000000;
1276 if (tvp->tv_sec < 0)
1277 tvp->tv_sec = tvp->tv_usec = 0;
1284 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1290 struct sigaction act, oldact;
1292 act.sa_handler = SIG_IGN;
1295 sigaction(sig, &act, &oldact);
1296 sigaction(sig, &oldact, NULL);
1301 * hup - Catch SIGHUP signal.
1303 * Indicates that the physical layer has been disconnected.
1304 * We don't rely on this indication; if the user has sent this
1305 * signal, we just take the link down.
1311 info("Hangup (SIGHUP)");
1314 /* Send the signal to the [dis]connector process(es) also */
1316 notify(sigreceived, sig);
1318 siglongjmp(sigjmp, 1);
1323 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1325 * Indicates that we should initiate a graceful disconnect and exit.
1332 info("Terminating on signal %d.", sig);
1335 /* Send the signal to the [dis]connector process(es) also */
1337 notify(sigreceived, sig);
1339 siglongjmp(sigjmp, 1);
1344 * chld - Catch SIGCHLD signal.
1345 * Sets a flag so we will call reap_kids in the mainline.
1353 siglongjmp(sigjmp, 1);
1358 * toggle_debug - Catch SIGUSR1 signal.
1360 * Toggle debug flag.
1369 setlogmask(LOG_UPTO(LOG_DEBUG));
1371 setlogmask(LOG_UPTO(LOG_WARNING));
1377 * open_ccp - Catch SIGUSR2 signal.
1379 * Try to (re)negotiate compression.
1388 siglongjmp(sigjmp, 1);
1393 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1399 static int crashed = 0;
1404 error("Fatal signal %d", sig);
1406 kill_my_pg(SIGTERM);
1407 notify(sigreceived, sig);
1412 * safe_fork - Create a child process. The child closes all the
1413 * file descriptors that we don't want to leak to a script.
1414 * The parent waits for the child to do this before returning.
1423 if (pipe(pipefd) == -1)
1424 pipefd[0] = pipefd[1] = -1;
1430 /* this read() blocks until the close(pipefd[1]) below */
1431 read(pipefd[0], buf, 1);
1439 notify(fork_notifier, 0);
1441 /* this close unblocks the read() call above in the parent */
1447 * device_script - run a program to talk to the specified fds
1448 * (e.g. to run the connector or disconnector script).
1449 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1452 device_script(program, in, out, dont_wait)
1466 error("Failed to create child process: %m");
1472 record_child(pid, program, NULL, NULL);
1475 while (waitpid(pid, &status, 0) < 0) {
1478 fatal("error waiting for (dis)connection process: %m");
1482 return (status == 0 ? 0 : -1);
1485 /* here we are executing in the child */
1487 /* dup in and out to fds > 2 */
1489 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1493 if (log_to_fd >= 0) {
1494 errfd = dup(log_to_fd);
1496 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1503 /* close fds 0 - 2 and any others we can think of */
1507 if (the_channel->close)
1508 (*the_channel->close)();
1512 /* dup the in, out, err fds to 0, 1, 2 */
1523 if (getuid() != uid) {
1524 error("setuid failed");
1528 execl("/bin/sh", "sh", "-c", program, (char *)0);
1529 error("could not exec /bin/sh: %m");
1536 * run-program - execute a program with given arguments,
1537 * but don't wait for it.
1538 * If the program can't be executed, logs an error unless
1539 * must_exist is 0 and the program file doesn't exist.
1540 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1541 * or isn't an executable plain file, or the process ID of the child.
1542 * If done != NULL, (*done)(arg) will be called later (within
1543 * reap_kids) iff the return value is > 0.
1546 run_program(prog, args, must_exist, done, arg)
1550 void (*done) __P((void *));
1557 * First check if the file exists and is executable.
1558 * We don't use access() because that would use the
1559 * real user-id, which might not be root, and the script
1560 * might be accessible only to root.
1563 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1564 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1565 if (must_exist || errno != ENOENT)
1566 warn("Can't execute %s: %m", prog);
1572 error("Failed to create child process for %s: %m", prog);
1577 dbglog("Script %s started (pid %d)", prog, pid);
1578 record_child(pid, prog, done, arg);
1582 /* Leave the current location */
1583 (void) setsid(); /* No controlling tty. */
1584 (void) umask (S_IRWXG|S_IRWXO);
1585 (void) chdir ("/"); /* no current directory. */
1586 setuid(0); /* set real UID = root */
1589 /* Ensure that nothing of our device environment is inherited. */
1591 if (the_channel->close)
1592 (*the_channel->close)();
1594 /* Don't pass handles to the PPP device, even by accident. */
1595 dup2(fd_devnull, 0);
1596 dup2(fd_devnull, 1);
1597 dup2(fd_devnull, 2);
1601 /* Force the priority back to zero if pppd is running higher. */
1602 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1603 warn("can't reset priority to 0: %m");
1606 /* SysV recommends a second fork at this point. */
1608 /* run the program */
1609 execve(prog, args, script_env);
1610 if (must_exist || errno != ENOENT) {
1611 /* have to reopen the log, there's nowhere else
1612 for the message to go. */
1614 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1622 * record_child - add a child process to the list for reap_kids
1626 record_child(pid, prog, done, arg)
1629 void (*done) __P((void *));
1632 struct subprocess *chp;
1636 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1638 warn("losing track of %s process", prog);
1644 chp->next = children;
1651 * reap_kids - get status from any dead child processes,
1652 * and log a message for abnormal terminations.
1659 struct subprocess *chp, **prevp;
1661 if (n_children == 0)
1663 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1665 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1666 if (chp->pid == pid) {
1672 if (WIFSIGNALED(status)) {
1673 warn("Child process %s (pid %d) terminated with signal %d",
1674 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1676 dbglog("Script %s finished (pid %d), status = 0x%x",
1677 (chp? chp->prog: "??"), pid,
1678 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1679 if (chp && chp->done)
1680 (*chp->done)(chp->arg);
1685 if (errno == ECHILD)
1688 error("Error waiting for child process: %m");
1694 * add_notifier - add a new function to be called when something happens.
1697 add_notifier(notif, func, arg)
1698 struct notifier **notif;
1702 struct notifier *np;
1704 np = malloc(sizeof(struct notifier));
1706 novm("notifier struct");
1714 * remove_notifier - remove a function from the list of things to
1715 * be called when something happens.
1718 remove_notifier(notif, func, arg)
1719 struct notifier **notif;
1723 struct notifier *np;
1725 for (; (np = *notif) != 0; notif = &np->next) {
1726 if (np->func == func && np->arg == arg) {
1735 * notify - call a set of functions registered with add_notifier.
1739 struct notifier *notif;
1742 struct notifier *np;
1744 while ((np = notif) != 0) {
1746 (*np->func)(np->arg, val);
1751 * novm - log an error message saying we ran out of memory, and die.
1757 fatal("Virtual memory exhausted allocating %s\n", msg);
1761 * script_setenv - set an environment variable value to be used
1762 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1765 script_setenv(var, value, iskey)
1769 size_t varl = strlen(var);
1770 size_t vl = varl + strlen(value) + 2;
1772 char *p, *newstring;
1774 newstring = (char *) malloc(vl+1);
1777 *newstring++ = iskey;
1778 slprintf(newstring, vl, "%s=%s", var, value);
1780 /* check if this variable is already set */
1781 if (script_env != 0) {
1782 for (i = 0; (p = script_env[i]) != 0; ++i) {
1783 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1785 if (p[-1] && pppdb != NULL)
1789 script_env[i] = newstring;
1791 if (iskey && pppdb != NULL)
1792 add_db_key(newstring);
1799 /* no space allocated for script env. ptrs. yet */
1801 script_env = (char **) malloc(16 * sizeof(char *));
1802 if (script_env == 0)
1807 /* reallocate script_env with more space if needed */
1808 if (i + 1 >= s_env_nalloc) {
1810 char **newenv = (char **) realloc((void *)script_env,
1811 new_n * sizeof(char *));
1814 script_env = newenv;
1815 s_env_nalloc = new_n;
1818 script_env[i] = newstring;
1819 script_env[i+1] = 0;
1822 if (pppdb != NULL) {
1824 add_db_key(newstring);
1831 * script_unsetenv - remove a variable from the environment
1835 script_unsetenv(var)
1838 int vl = strlen(var);
1842 if (script_env == 0)
1844 for (i = 0; (p = script_env[i]) != 0; ++i) {
1845 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1847 if (p[-1] && pppdb != NULL)
1851 while ((script_env[i] = script_env[i+1]) != 0)
1864 * update_db_entry - update our entry in the database.
1873 if (script_env == NULL)
1876 for (i = 0; (p = script_env[i]) != 0; ++i)
1877 vlen += strlen(p) + 1;
1878 vbuf = malloc(vlen);
1880 novm("database entry");
1882 for (i = 0; (p = script_env[i]) != 0; ++i)
1883 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1886 key.dsize = strlen(db_key);
1889 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1890 error("tdb_store failed: %s", tdb_error(pppdb));
1898 * add_db_key - add a key that we can use to look up our database entry.
1906 key.dptr = (char *) str;
1907 key.dsize = strlen(str);
1909 dbuf.dsize = strlen(db_key);
1910 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1911 error("tdb_store key failed: %s", tdb_error(pppdb));
1915 * delete_db_key - delete a key for looking up our database entry.
1923 key.dptr = (char *) str;
1924 key.dsize = strlen(str);
1925 tdb_delete(pppdb, key);
1929 * cleanup_db - delete all the entries we put in the database.
1939 key.dsize = strlen(db_key);
1940 tdb_delete(pppdb, key);
1941 for (i = 0; (p = script_env[i]) != 0; ++i)
1945 #endif /* USE_TDB */