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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29 * 4. Redistributions of any form whatsoever must retain the following
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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39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
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43 #define RCSID "$Id: main.c,v 1.135 2004/04/12 05:02:00 kad 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;
181 * We maintain a list of child process pids and
182 * functions to call when they exit.
187 void (*done) __P((void *));
189 struct subprocess *next;
192 static struct subprocess *children;
194 /* Prototypes for procedures local to this file. */
196 static void setup_signals __P((void));
197 static void create_pidfile __P((int pid));
198 static void create_linkpidfile __P((int pid));
199 static void cleanup __P((void));
200 static void get_input __P((void));
201 static void calltimeout __P((void));
202 static struct timeval *timeleft __P((struct timeval *));
203 static void kill_my_pg __P((int));
204 static void hup __P((int));
205 static void term __P((int));
206 static void chld __P((int));
207 static void toggle_debug __P((int));
208 static void open_ccp __P((int));
209 static void bad_signal __P((int));
210 static void holdoff_end __P((void *));
211 static int reap_kids __P((int waitfor));
214 static void update_db_entry __P((void));
215 static void add_db_key __P((const char *));
216 static void delete_db_key __P((const char *));
217 static void cleanup_db __P((void));
220 static void handle_events __P((void));
221 static void print_link_stats __P((void));
223 extern char *ttyname __P((int));
224 extern char *getlogin __P((void));
225 int main __P((int, char *[]));
229 #define O_NONBLOCK O_NDELAY
233 #define setlogmask(x)
237 * PPP Data Link Layer "protocol" table.
238 * One entry per supported protocol.
239 * The last entry must be NULL.
241 struct protent *protocols[] = {
265 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
267 #if !defined(PPP_DRV_NAME)
268 #define PPP_DRV_NAME "ppp"
269 #endif /* !defined(PPP_DRV_NAME) */
279 struct protent *protp;
282 link_stats_valid = 0;
283 new_phase(PHASE_INITIALIZE);
287 /* Initialize syslog facilities */
290 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
291 option_error("Couldn't get hostname: %m");
294 hostname[MAXNAMELEN-1] = 0;
296 /* make sure we don't create world or group writable files. */
297 umask(umask(0777) | 022);
300 privileged = uid == 0;
301 slprintf(numbuf, sizeof(numbuf), "%d", uid);
302 script_setenv("ORIG_UID", numbuf, 0);
304 ngroups = getgroups(NGROUPS_MAX, groups);
307 * Initialize magic number generator now so that protocols may
308 * use magic numbers in initialization.
313 * Initialize each protocol.
315 for (i = 0; (protp = protocols[i]) != NULL; ++i)
319 * Initialize the default channel.
326 * Parse, in order, the system options file, the user's options file,
327 * and the command line arguments.
329 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
330 || !options_from_user()
331 || !parse_args(argc-1, argv+1))
332 exit(EXIT_OPTION_ERROR);
333 devnam_fixed = 1; /* can no longer change device name */
336 * Work out the device name, if it hasn't already been specified,
337 * and parse the tty's options file.
339 if (the_channel->process_extra_options)
340 (*the_channel->process_extra_options)();
343 setlogmask(LOG_UPTO(LOG_DEBUG));
346 * Check that we are running as root.
348 if (geteuid() != 0) {
349 option_error("must be root to run %s, since it is not setuid-root",
354 if (!ppp_available()) {
355 option_error("%s", no_ppp_msg);
356 exit(EXIT_NO_KERNEL_SUPPORT);
360 * Check that the options given are valid and consistent.
363 if (!sys_check_options())
364 exit(EXIT_OPTION_ERROR);
365 auth_check_options();
366 #ifdef HAVE_MULTILINK
369 for (i = 0; (protp = protocols[i]) != NULL; ++i)
370 if (protp->check_options != NULL)
371 (*protp->check_options)();
372 if (the_channel->check_options)
373 (*the_channel->check_options)();
376 if (dump_options || dryrun) {
377 init_pr_log(NULL, LOG_INFO);
378 print_options(pr_log, NULL);
386 * Initialize system-dependent stuff.
390 /* Make sure fds 0, 1, 2 are open to somewhere. */
391 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
393 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
394 while (fd_devnull <= 2) {
397 fatal("Critical shortage of file descriptors: dup failed: %m");
402 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
404 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
407 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
409 warn("Warning: disabling multilink");
416 * Detach ourselves from the terminal, if required,
417 * and identify who is running us.
419 if (!nodetach && !updetach)
424 if (pw != NULL && pw->pw_name != NULL)
429 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
430 script_setenv("PPPLOGNAME", p, 0);
433 script_setenv("DEVICE", devnam, 1);
434 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
435 script_setenv("PPPD_PID", numbuf, 1);
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.
460 create_linkpidfile(getpid());
471 doing_callback = do_callback;
474 if (demand && !doing_callback) {
476 * Don't do anything until we see some activity.
478 new_phase(PHASE_DORMANT);
483 if (kill_link && !persist)
485 if (get_loop_output())
489 if (kill_link && !persist)
493 * Now we want to bring up the link.
496 info("Starting link");
499 new_phase(PHASE_SERIALCONN);
501 devfd = the_channel->connect();
505 /* set up the serial device as a ppp interface */
507 tdb_writelock(pppdb);
509 fd_ppp = the_channel->establish_ppp(devfd);
512 tdb_writeunlock(pppdb);
514 status = EXIT_FATAL_ERROR;
517 /* create the pid file, now that we've obtained a ppp interface */
519 create_linkpidfile(getpid());
521 if (!demand && ifunit >= 0)
524 tdb_writeunlock(pppdb);
528 * Start opening the connection and wait for
529 * incoming events (reply, timeout, etc.).
532 notice("Connect: %s <--> %s", ifname, ppp_devnam);
534 notice("Starting negotiation on %s", ppp_devnam);
535 gettimeofday(&start_time, NULL);
536 script_unsetenv("CONNECT_TIME");
537 script_unsetenv("BYTES_SENT");
538 script_unsetenv("BYTES_RCVD");
542 lcp_open(0); /* Start protocol */
543 status = EXIT_NEGOTIATION_FAILED;
544 new_phase(PHASE_ESTABLISH);
545 while (phase != PHASE_DEAD) {
549 lcp_close(0, "User request");
551 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
552 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
553 (*ccp_protent.open)(0);
561 * Delete pid file before disestablishing ppp. Otherwise it
562 * can happen that another pppd gets the same unit and then
563 * we delete its pid file.
566 if (pidfilename[0] != 0
567 && unlink(pidfilename) < 0 && errno != ENOENT)
568 warn("unable to delete pid file %s: %m", pidfilename);
573 * If we may want to bring the link up again, transfer
574 * the ppp unit back to the loopback. Set the
575 * real serial device back to its normal mode of operation.
579 the_channel->disestablish_ppp(devfd);
584 script_unsetenv("IFNAME");
587 * Run disconnector script, if requested.
588 * XXX we may not be able to do this if the line has hung up!
591 new_phase(PHASE_DISCONNECT);
592 if (the_channel->disconnect)
593 the_channel->disconnect();
596 if (the_channel->cleanup)
597 (*the_channel->cleanup)();
600 if (pidfilename[0] != 0
601 && unlink(pidfilename) < 0 && errno != ENOENT)
602 warn("unable to delete pid file %s: %m", pidfilename);
606 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
611 t = need_holdoff? holdoff: 0;
613 t = (*holdoff_hook)();
615 new_phase(PHASE_HOLDOFF);
616 TIMEOUT(holdoff_end, NULL, t);
620 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
621 } while (phase == PHASE_HOLDOFF);
627 /* Wait for scripts to finish */
628 /* XXX should have a timeout here */
629 while (n_children > 0) {
631 struct subprocess *chp;
632 dbglog("Waiting for %d child processes...", n_children);
633 for (chp = children; chp != NULL; chp = chp->next)
634 dbglog(" script %s, pid %d", chp->prog, chp->pid);
636 if (reap_kids(1) < 0)
645 * handle_events - wait for something to happen and respond to it.
654 sigaddset(&mask, SIGHUP);
655 sigaddset(&mask, SIGINT);
656 sigaddset(&mask, SIGTERM);
657 sigaddset(&mask, SIGCHLD);
658 sigaddset(&mask, SIGUSR2);
660 kill_link = open_ccp_flag = 0;
661 if (sigsetjmp(sigjmp, 1) == 0) {
662 sigprocmask(SIG_BLOCK, &mask, NULL);
663 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
664 sigprocmask(SIG_UNBLOCK, &mask, NULL);
667 sigprocmask(SIG_UNBLOCK, &mask, NULL);
668 wait_input(timeleft(&timo));
676 if (status != EXIT_HANGUP)
677 status = EXIT_USER_REQUEST;
682 status = EXIT_USER_REQUEST;
686 reap_kids(0); /* Don't leave dead kids lying around */
696 * setup_signals - initialize signal handling.
705 * Compute mask of all interesting signals and install signal handlers
706 * for each. Only one signal handler may be active at a time. Therefore,
707 * all other signals should be masked when any handler is executing.
710 sigaddset(&mask, SIGHUP);
711 sigaddset(&mask, SIGINT);
712 sigaddset(&mask, SIGTERM);
713 sigaddset(&mask, SIGCHLD);
714 sigaddset(&mask, SIGUSR2);
716 #define SIGNAL(s, handler) do { \
717 sa.sa_handler = handler; \
718 if (sigaction(s, &sa, NULL) < 0) \
719 fatal("Couldn't establish signal handler (%d): %m", s); \
724 SIGNAL(SIGHUP, hup); /* Hangup */
725 SIGNAL(SIGINT, term); /* Interrupt */
726 SIGNAL(SIGTERM, term); /* Terminate */
727 SIGNAL(SIGCHLD, chld);
729 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
730 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
733 * Install a handler for other signals which would otherwise
734 * cause pppd to exit without cleaning up.
736 SIGNAL(SIGABRT, bad_signal);
737 SIGNAL(SIGALRM, bad_signal);
738 SIGNAL(SIGFPE, bad_signal);
739 SIGNAL(SIGILL, bad_signal);
740 SIGNAL(SIGPIPE, bad_signal);
741 SIGNAL(SIGQUIT, bad_signal);
742 SIGNAL(SIGSEGV, bad_signal);
744 SIGNAL(SIGBUS, bad_signal);
747 SIGNAL(SIGEMT, bad_signal);
750 SIGNAL(SIGPOLL, bad_signal);
753 SIGNAL(SIGPROF, bad_signal);
756 SIGNAL(SIGSYS, bad_signal);
759 SIGNAL(SIGTRAP, bad_signal);
762 SIGNAL(SIGVTALRM, bad_signal);
765 SIGNAL(SIGXCPU, bad_signal);
768 SIGNAL(SIGXFSZ, bad_signal);
772 * Apparently we can get a SIGPIPE when we call syslog, if
773 * syslogd has died and been restarted. Ignoring it seems
776 signal(SIGPIPE, SIG_IGN);
780 * set_ifunit - do things we need to do once we know which ppp
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(getpid()); /* write pid to file */
792 create_linkpidfile(getpid());
797 * detach - detach us from the controlling terminal.
808 if (pipe(pipefd) == -1)
809 pipefd[0] = pipefd[1] = -1;
810 if ((pid = fork()) < 0) {
811 error("Couldn't detach (fork failed: %m)");
812 die(1); /* or just return? */
816 notify(pidchange, pid);
817 /* update pid files if they have been written already */
821 create_linkpidfile(pid);
822 exit(0); /* parent dies */
832 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
833 script_setenv("PPPD_PID", numbuf, 1);
835 /* wait for parent to finish updating pid & lock files and die */
837 complete_read(pipefd[0], numbuf, 1);
842 * reopen_log - (re)open our connection to syslog.
848 openlog("pppd", LOG_PID);
850 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
851 setlogmask(LOG_UPTO(LOG_INFO));
856 * Create a file containing our process ID.
864 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
865 _PATH_VARRUN, ifname);
866 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
867 fprintf(pidfile, "%d\n", pid);
868 (void) fclose(pidfile);
870 error("Failed to create pid file %s: %m", pidfilename);
876 create_linkpidfile(pid)
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", pid);
889 fprintf(pidfile, "%s\n", ifname);
890 (void) fclose(pidfile);
892 error("Failed to create pid file %s: %m", linkpidfile);
898 * holdoff_end - called via a timeout when the holdoff period ends.
904 new_phase(PHASE_DORMANT);
907 /* List of protocol names, to make our messages a little more informative. */
908 struct protocol_list {
911 } protocol_list[] = {
913 { 0x23, "OSI Network Layer" },
914 { 0x25, "Xerox NS IDP" },
915 { 0x27, "DECnet Phase IV" },
916 { 0x29, "Appletalk" },
917 { 0x2b, "Novell IPX" },
918 { 0x2d, "VJ compressed TCP/IP" },
919 { 0x2f, "VJ uncompressed TCP/IP" },
920 { 0x31, "Bridging PDU" },
921 { 0x33, "Stream Protocol ST-II" },
922 { 0x35, "Banyan Vines" },
923 { 0x39, "AppleTalk EDDP" },
924 { 0x3b, "AppleTalk SmartBuffered" },
925 { 0x3d, "Multi-Link" },
926 { 0x3f, "NETBIOS Framing" },
927 { 0x41, "Cisco Systems" },
928 { 0x43, "Ascom Timeplex" },
929 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
930 { 0x47, "DCA Remote Lan" },
931 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
932 { 0x4b, "SNA over 802.2" },
934 { 0x4f, "IP6 Header Compression" },
935 { 0x6f, "Stampede Bridging" },
936 { 0xfb, "single-link compression" },
937 { 0xfd, "1st choice compression" },
938 { 0x0201, "802.1d Hello Packets" },
939 { 0x0203, "IBM Source Routing BPDU" },
940 { 0x0205, "DEC LANBridge100 Spanning Tree" },
941 { 0x0231, "Luxcom" },
942 { 0x0233, "Sigma Network Systems" },
943 { 0x8021, "Internet Protocol Control Protocol" },
944 { 0x8023, "OSI Network Layer Control Protocol" },
945 { 0x8025, "Xerox NS IDP Control Protocol" },
946 { 0x8027, "DECnet Phase IV Control Protocol" },
947 { 0x8029, "Appletalk Control Protocol" },
948 { 0x802b, "Novell IPX Control Protocol" },
949 { 0x8031, "Bridging NCP" },
950 { 0x8033, "Stream Protocol Control Protocol" },
951 { 0x8035, "Banyan Vines Control Protocol" },
952 { 0x803d, "Multi-Link Control Protocol" },
953 { 0x803f, "NETBIOS Framing Control Protocol" },
954 { 0x8041, "Cisco Systems Control Protocol" },
955 { 0x8043, "Ascom Timeplex" },
956 { 0x8045, "Fujitsu LBLB Control Protocol" },
957 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
958 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
959 { 0x804b, "SNA over 802.2 Control Protocol" },
960 { 0x804d, "SNA Control Protocol" },
961 { 0x804f, "IP6 Header Compression Control Protocol" },
962 { 0x006f, "Stampede Bridging Control Protocol" },
963 { 0x80fb, "Single Link Compression Control Protocol" },
964 { 0x80fd, "Compression Control Protocol" },
965 { 0xc021, "Link Control Protocol" },
966 { 0xc023, "Password Authentication Protocol" },
967 { 0xc025, "Link Quality Report" },
968 { 0xc027, "Shiva Password Authentication Protocol" },
969 { 0xc029, "CallBack Control Protocol (CBCP)" },
970 { 0xc081, "Container Control Protocol" },
971 { 0xc223, "Challenge Handshake Authentication Protocol" },
972 { 0xc281, "Proprietary Authentication Protocol" },
977 * protocol_name - find a name for a PPP protocol.
983 struct protocol_list *lp;
985 for (lp = protocol_list; lp->proto != 0; ++lp)
986 if (proto == lp->proto)
992 * get_input - called when incoming data is available.
1000 struct protent *protp;
1002 p = inpacket_buf; /* point to beginning of packet buffer */
1004 len = read_packet(inpacket_buf);
1009 notice("Modem hangup");
1011 status = EXIT_HANGUP;
1012 lcp_lowerdown(0); /* serial link is no longer available */
1017 if (len < PPP_HDRLEN) {
1018 dbglog("received short packet:%.*B", len, p);
1022 dump_packet("rcvd", p, len);
1023 if (snoop_recv_hook) snoop_recv_hook(p, len);
1025 p += 2; /* Skip address and control */
1026 GETSHORT(protocol, p);
1030 * Toss all non-LCP packets unless LCP is OPEN.
1032 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1033 dbglog("Discarded non-LCP packet when LCP not open");
1038 * Until we get past the authentication phase, toss all packets
1039 * except LCP, LQR and authentication packets.
1041 if (phase <= PHASE_AUTHENTICATE
1042 && !(protocol == PPP_LCP || protocol == PPP_LQR
1043 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1044 protocol == PPP_EAP)) {
1045 dbglog("discarding proto 0x%x in phase %d",
1051 * Upcall the proper protocol input routine.
1053 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1054 if (protp->protocol == protocol && protp->enabled_flag) {
1055 (*protp->input)(0, p, len);
1058 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1059 && protp->datainput != NULL) {
1060 (*protp->datainput)(0, p, len);
1066 const char *pname = protocol_name(protocol);
1068 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1070 warn("Unsupported protocol 0x%x received", protocol);
1072 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1076 * ppp_send_config - configure the transmit-side characteristics of
1077 * the ppp interface. Returns -1, indicating an error, if the channel
1078 * send_config procedure called error() (or incremented error_count
1079 * itself), otherwise 0.
1082 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1089 if (the_channel->send_config == NULL)
1092 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1093 return (error_count != errs)? -1: 0;
1097 * ppp_recv_config - configure the receive-side characteristics of
1098 * the ppp interface. Returns -1, indicating an error, if the channel
1099 * recv_config procedure called error() (or incremented error_count
1100 * itself), otherwise 0.
1103 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1110 if (the_channel->recv_config == NULL)
1113 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1114 return (error_count != errs)? -1: 0;
1118 * new_phase - signal the start of a new phase of pppd's operation.
1126 (*new_phase_hook)(p);
1127 notify(phasechange, p);
1131 * die - clean up state and exit with the specified status.
1139 notify(exitnotify, status);
1140 syslog(LOG_INFO, "Exit.");
1145 * cleanup - restore anything which needs to be restored before we exit
1154 the_channel->disestablish_ppp(devfd);
1155 if (the_channel->cleanup)
1156 (*the_channel->cleanup)();
1158 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1159 warn("unable to delete pid file %s: %m", pidfilename);
1161 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1162 warn("unable to delete pid file %s: %m", linkpidfile);
1176 * Print connect time and statistics.
1178 if (link_stats_valid) {
1179 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1180 info("Connect time %d.%d minutes.", t/10, t%10);
1181 info("Sent %u bytes, received %u bytes.",
1182 link_stats.bytes_out, link_stats.bytes_in);
1183 link_stats_valid = 0;
1188 * update_link_stats - get stats at link termination.
1191 update_link_stats(u)
1197 if (!get_ppp_stats(u, &link_stats)
1198 || gettimeofday(&now, NULL) < 0)
1200 link_connect_time = now.tv_sec - start_time.tv_sec;
1201 link_stats_valid = 1;
1203 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1204 script_setenv("CONNECT_TIME", numbuf, 0);
1205 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1206 script_setenv("BYTES_SENT", numbuf, 0);
1207 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1208 script_setenv("BYTES_RCVD", numbuf, 0);
1213 struct timeval c_time; /* time at which to call routine */
1214 void *c_arg; /* argument to routine */
1215 void (*c_func) __P((void *)); /* routine */
1216 struct callout *c_next;
1219 static struct callout *callout = NULL; /* Callout list */
1220 static struct timeval timenow; /* Current time */
1223 * timeout - Schedule a timeout.
1226 timeout(func, arg, secs, usecs)
1227 void (*func) __P((void *));
1231 struct callout *newp, *p, **pp;
1233 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1239 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1240 fatal("Out of memory in timeout()!");
1242 newp->c_func = func;
1243 gettimeofday(&timenow, NULL);
1244 newp->c_time.tv_sec = timenow.tv_sec + secs;
1245 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1246 if (newp->c_time.tv_usec >= 1000000) {
1247 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1248 newp->c_time.tv_usec %= 1000000;
1252 * Find correct place and link it in.
1254 for (pp = &callout; (p = *pp); pp = &p->c_next)
1255 if (newp->c_time.tv_sec < p->c_time.tv_sec
1256 || (newp->c_time.tv_sec == p->c_time.tv_sec
1257 && newp->c_time.tv_usec < p->c_time.tv_usec))
1265 * untimeout - Unschedule a timeout.
1268 untimeout(func, arg)
1269 void (*func) __P((void *));
1272 struct callout **copp, *freep;
1274 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1277 * Find first matching timeout and remove it from the list.
1279 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1280 if (freep->c_func == func && freep->c_arg == arg) {
1281 *copp = freep->c_next;
1282 free((char *) freep);
1289 * calltimeout - Call any timeout routines which are now due.
1296 while (callout != NULL) {
1299 if (gettimeofday(&timenow, NULL) < 0)
1300 fatal("Failed to get time of day: %m");
1301 if (!(p->c_time.tv_sec < timenow.tv_sec
1302 || (p->c_time.tv_sec == timenow.tv_sec
1303 && p->c_time.tv_usec <= timenow.tv_usec)))
1304 break; /* no, it's not time yet */
1306 callout = p->c_next;
1307 (*p->c_func)(p->c_arg);
1315 * timeleft - return the length of time until the next timeout is due.
1317 static struct timeval *
1319 struct timeval *tvp;
1321 if (callout == NULL)
1324 gettimeofday(&timenow, NULL);
1325 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1326 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1327 if (tvp->tv_usec < 0) {
1328 tvp->tv_usec += 1000000;
1331 if (tvp->tv_sec < 0)
1332 tvp->tv_sec = tvp->tv_usec = 0;
1339 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1340 * We assume that sig is currently blocked.
1346 struct sigaction act, oldact;
1348 sigemptyset(&act.sa_mask);
1349 sigaddset(&act.sa_mask, sig);
1351 act.sa_handler = SIG_IGN;
1355 * The kill() above made the signal pending for us, as well as
1356 * the rest of our process group, but we don't want it delivered
1357 * to us. It is blocked at the moment. Setting it to be ignored
1358 * will cause the pending signal to be discarded. If we did the
1359 * kill() after setting the signal to be ignored, it is unspecified
1360 * (by POSIX) whether the signal is immediately discarded or left
1361 * pending, and in fact Linux would leave it pending, and so it
1362 * would be delivered after the current signal handler exits,
1363 * leading to an infinite loop.
1365 sigaction(sig, &act, &oldact);
1366 sigaction(sig, &oldact, NULL);
1371 * hup - Catch SIGHUP signal.
1373 * Indicates that the physical layer has been disconnected.
1374 * We don't rely on this indication; if the user has sent this
1375 * signal, we just take the link down.
1381 info("Hangup (SIGHUP)");
1384 /* Send the signal to the [dis]connector process(es) also */
1386 notify(sigreceived, sig);
1388 siglongjmp(sigjmp, 1);
1393 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1395 * Indicates that we should initiate a graceful disconnect and exit.
1402 info("Terminating on signal %d.", sig);
1405 /* Send the signal to the [dis]connector process(es) also */
1407 notify(sigreceived, sig);
1409 siglongjmp(sigjmp, 1);
1414 * chld - Catch SIGCHLD signal.
1415 * Sets a flag so we will call reap_kids in the mainline.
1423 siglongjmp(sigjmp, 1);
1428 * toggle_debug - Catch SIGUSR1 signal.
1430 * Toggle debug flag.
1439 setlogmask(LOG_UPTO(LOG_DEBUG));
1441 setlogmask(LOG_UPTO(LOG_WARNING));
1447 * open_ccp - Catch SIGUSR2 signal.
1449 * Try to (re)negotiate compression.
1458 siglongjmp(sigjmp, 1);
1463 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1469 static int crashed = 0;
1474 error("Fatal signal %d", sig);
1476 kill_my_pg(SIGTERM);
1477 notify(sigreceived, sig);
1482 * safe_fork - Create a child process. The child closes all the
1483 * file descriptors that we don't want to leak to a script.
1484 * The parent waits for the child to do this before returning.
1493 if (pipe(pipefd) == -1)
1494 pipefd[0] = pipefd[1] = -1;
1500 /* this read() blocks until the close(pipefd[1]) below */
1501 complete_read(pipefd[0], buf, 1);
1509 notify(fork_notifier, 0);
1511 /* this close unblocks the read() call above in the parent */
1517 * device_script - run a program to talk to the specified fds
1518 * (e.g. to run the connector or disconnector script).
1519 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1522 device_script(program, in, out, dont_wait)
1537 error("Failed to create child process: %m");
1543 record_child(pid, program, NULL, NULL);
1546 while (waitpid(pid, &status, 0) < 0) {
1549 fatal("error waiting for (dis)connection process: %m");
1553 return (status == 0 ? 0 : -1);
1556 /* here we are executing in the child */
1558 /* make sure fds 0, 1, 2 are occupied */
1559 while ((fd = dup(in)) >= 0) {
1566 /* dup in and out to fds > 2 */
1568 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1572 if (log_to_fd >= 0) {
1573 errfd = dup(log_to_fd);
1575 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1582 /* close fds 0 - 2 and any others we can think of */
1586 if (the_channel->close)
1587 (*the_channel->close)();
1591 /* dup the in, out, err fds to 0, 1, 2 */
1602 if (getuid() != uid) {
1603 error("setuid failed");
1607 execl("/bin/sh", "sh", "-c", program, (char *)0);
1608 error("could not exec /bin/sh: %m");
1615 * run-program - execute a program with given arguments,
1616 * but don't wait for it.
1617 * If the program can't be executed, logs an error unless
1618 * must_exist is 0 and the program file doesn't exist.
1619 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1620 * or isn't an executable plain file, or the process ID of the child.
1621 * If done != NULL, (*done)(arg) will be called later (within
1622 * reap_kids) iff the return value is > 0.
1625 run_program(prog, args, must_exist, done, arg)
1629 void (*done) __P((void *));
1636 * First check if the file exists and is executable.
1637 * We don't use access() because that would use the
1638 * real user-id, which might not be root, and the script
1639 * might be accessible only to root.
1642 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1643 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1644 if (must_exist || errno != ENOENT)
1645 warn("Can't execute %s: %m", prog);
1651 error("Failed to create child process for %s: %m", prog);
1656 dbglog("Script %s started (pid %d)", prog, pid);
1657 record_child(pid, prog, done, arg);
1661 /* Leave the current location */
1662 (void) setsid(); /* No controlling tty. */
1663 (void) umask (S_IRWXG|S_IRWXO);
1664 (void) chdir ("/"); /* no current directory. */
1665 setuid(0); /* set real UID = root */
1668 /* Ensure that nothing of our device environment is inherited. */
1670 if (the_channel->close)
1671 (*the_channel->close)();
1673 /* Don't pass handles to the PPP device, even by accident. */
1674 dup2(fd_devnull, 0);
1675 dup2(fd_devnull, 1);
1676 dup2(fd_devnull, 2);
1680 /* Force the priority back to zero if pppd is running higher. */
1681 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1682 warn("can't reset priority to 0: %m");
1685 /* SysV recommends a second fork at this point. */
1687 /* run the program */
1688 execve(prog, args, script_env);
1689 if (must_exist || errno != ENOENT) {
1690 /* have to reopen the log, there's nowhere else
1691 for the message to go. */
1693 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1701 * record_child - add a child process to the list for reap_kids
1705 record_child(pid, prog, done, arg)
1708 void (*done) __P((void *));
1711 struct subprocess *chp;
1715 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1717 warn("losing track of %s process", prog);
1723 chp->next = children;
1730 * reap_kids - get status from any dead child processes,
1731 * and log a message for abnormal terminations.
1738 struct subprocess *chp, **prevp;
1740 if (n_children == 0)
1742 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1744 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1745 if (chp->pid == pid) {
1751 if (WIFSIGNALED(status)) {
1752 warn("Child process %s (pid %d) terminated with signal %d",
1753 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1755 dbglog("Script %s finished (pid %d), status = 0x%x",
1756 (chp? chp->prog: "??"), pid,
1757 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1758 if (chp && chp->done)
1759 (*chp->done)(chp->arg);
1764 if (errno == ECHILD)
1767 error("Error waiting for child process: %m");
1773 * add_notifier - add a new function to be called when something happens.
1776 add_notifier(notif, func, arg)
1777 struct notifier **notif;
1781 struct notifier *np;
1783 np = malloc(sizeof(struct notifier));
1785 novm("notifier struct");
1793 * remove_notifier - remove a function from the list of things to
1794 * be called when something happens.
1797 remove_notifier(notif, func, arg)
1798 struct notifier **notif;
1802 struct notifier *np;
1804 for (; (np = *notif) != 0; notif = &np->next) {
1805 if (np->func == func && np->arg == arg) {
1814 * notify - call a set of functions registered with add_notifier.
1818 struct notifier *notif;
1821 struct notifier *np;
1823 while ((np = notif) != 0) {
1825 (*np->func)(np->arg, val);
1830 * novm - log an error message saying we ran out of memory, and die.
1836 fatal("Virtual memory exhausted allocating %s\n", msg);
1840 * script_setenv - set an environment variable value to be used
1841 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1844 script_setenv(var, value, iskey)
1848 size_t varl = strlen(var);
1849 size_t vl = varl + strlen(value) + 2;
1851 char *p, *newstring;
1853 newstring = (char *) malloc(vl+1);
1856 *newstring++ = iskey;
1857 slprintf(newstring, vl, "%s=%s", var, value);
1859 /* check if this variable is already set */
1860 if (script_env != 0) {
1861 for (i = 0; (p = script_env[i]) != 0; ++i) {
1862 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1864 if (p[-1] && pppdb != NULL)
1868 script_env[i] = newstring;
1870 if (iskey && pppdb != NULL)
1871 add_db_key(newstring);
1878 /* no space allocated for script env. ptrs. yet */
1880 script_env = (char **) malloc(16 * sizeof(char *));
1881 if (script_env == 0)
1886 /* reallocate script_env with more space if needed */
1887 if (i + 1 >= s_env_nalloc) {
1889 char **newenv = (char **) realloc((void *)script_env,
1890 new_n * sizeof(char *));
1893 script_env = newenv;
1894 s_env_nalloc = new_n;
1897 script_env[i] = newstring;
1898 script_env[i+1] = 0;
1901 if (pppdb != NULL) {
1903 add_db_key(newstring);
1910 * script_unsetenv - remove a variable from the environment
1914 script_unsetenv(var)
1917 int vl = strlen(var);
1921 if (script_env == 0)
1923 for (i = 0; (p = script_env[i]) != 0; ++i) {
1924 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1926 if (p[-1] && pppdb != NULL)
1930 while ((script_env[i] = script_env[i+1]) != 0)
1943 * update_db_entry - update our entry in the database.
1952 if (script_env == NULL)
1955 for (i = 0; (p = script_env[i]) != 0; ++i)
1956 vlen += strlen(p) + 1;
1957 vbuf = malloc(vlen);
1959 novm("database entry");
1961 for (i = 0; (p = script_env[i]) != 0; ++i)
1962 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1965 key.dsize = strlen(db_key);
1968 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1969 error("tdb_store failed: %s", tdb_error(pppdb));
1977 * add_db_key - add a key that we can use to look up our database entry.
1985 key.dptr = (char *) str;
1986 key.dsize = strlen(str);
1988 dbuf.dsize = strlen(db_key);
1989 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1990 error("tdb_store key failed: %s", tdb_error(pppdb));
1994 * delete_db_key - delete a key for looking up our database entry.
2002 key.dptr = (char *) str;
2003 key.dsize = strlen(str);
2004 tdb_delete(pppdb, key);
2008 * cleanup_db - delete all the entries we put in the database.
2018 key.dsize = strlen(db_key);
2019 tdb_delete(pppdb, key);
2020 for (i = 0; (p = script_env[i]) != 0; ++i)
2024 #endif /* USE_TDB */