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.
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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
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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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43 #define RCSID "$Id: main.c,v 1.127 2003/05/12 07:31:36 fcusack 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 the_channel->disconnect();
595 if (the_channel->cleanup)
596 (*the_channel->cleanup)();
599 if (pidfilename[0] != 0
600 && unlink(pidfilename) < 0 && errno != ENOENT)
601 warn("unable to delete pid file %s: %m", pidfilename);
605 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
610 t = need_holdoff? holdoff: 0;
612 t = (*holdoff_hook)();
614 new_phase(PHASE_HOLDOFF);
615 TIMEOUT(holdoff_end, NULL, t);
619 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
620 } while (phase == PHASE_HOLDOFF);
626 /* Wait for scripts to finish */
627 /* XXX should have a timeout here */
628 while (n_children > 0) {
630 struct subprocess *chp;
631 dbglog("Waiting for %d child processes...", n_children);
632 for (chp = children; chp != NULL; chp = chp->next)
633 dbglog(" script %s, pid %d", chp->prog, chp->pid);
635 if (reap_kids(1) < 0)
644 * handle_events - wait for something to happen and respond to it.
652 kill_link = open_ccp_flag = 0;
653 if (sigsetjmp(sigjmp, 1) == 0) {
654 sigprocmask(SIG_BLOCK, &mask, NULL);
655 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
656 sigprocmask(SIG_UNBLOCK, &mask, NULL);
659 sigprocmask(SIG_UNBLOCK, &mask, NULL);
660 wait_input(timeleft(&timo));
668 if (status != EXIT_HANGUP)
669 status = EXIT_USER_REQUEST;
674 status = EXIT_USER_REQUEST;
678 reap_kids(0); /* Don't leave dead kids lying around */
688 * setup_signals - initialize signal handling.
697 * Compute mask of all interesting signals and install signal handlers
698 * for each. Only one signal handler may be active at a time. Therefore,
699 * all other signals should be masked when any handler is executing.
702 sigaddset(&mask, SIGHUP);
703 sigaddset(&mask, SIGINT);
704 sigaddset(&mask, SIGTERM);
705 sigaddset(&mask, SIGCHLD);
706 sigaddset(&mask, SIGUSR2);
708 #define SIGNAL(s, handler) do { \
709 sa.sa_handler = handler; \
710 if (sigaction(s, &sa, NULL) < 0) \
711 fatal("Couldn't establish signal handler (%d): %m", s); \
716 SIGNAL(SIGHUP, hup); /* Hangup */
717 SIGNAL(SIGINT, term); /* Interrupt */
718 SIGNAL(SIGTERM, term); /* Terminate */
719 SIGNAL(SIGCHLD, chld);
721 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
722 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
725 * Install a handler for other signals which would otherwise
726 * cause pppd to exit without cleaning up.
728 SIGNAL(SIGABRT, bad_signal);
729 SIGNAL(SIGALRM, bad_signal);
730 SIGNAL(SIGFPE, bad_signal);
731 SIGNAL(SIGILL, bad_signal);
732 SIGNAL(SIGPIPE, bad_signal);
733 SIGNAL(SIGQUIT, bad_signal);
734 SIGNAL(SIGSEGV, bad_signal);
736 SIGNAL(SIGBUS, bad_signal);
739 SIGNAL(SIGEMT, bad_signal);
742 SIGNAL(SIGPOLL, bad_signal);
745 SIGNAL(SIGPROF, bad_signal);
748 SIGNAL(SIGSYS, bad_signal);
751 SIGNAL(SIGTRAP, bad_signal);
754 SIGNAL(SIGVTALRM, bad_signal);
757 SIGNAL(SIGXCPU, bad_signal);
760 SIGNAL(SIGXFSZ, bad_signal);
764 * Apparently we can get a SIGPIPE when we call syslog, if
765 * syslogd has died and been restarted. Ignoring it seems
768 signal(SIGPIPE, SIG_IGN);
772 * set_ifunit - do things we need to do once we know which ppp
779 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
780 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
781 script_setenv("IFNAME", ifname, iskey);
783 create_pidfile(getpid()); /* write pid to file */
784 create_linkpidfile(getpid());
789 * detach - detach us from the controlling terminal.
800 if (pipe(pipefd) == -1)
801 pipefd[0] = pipefd[1] = -1;
802 if ((pid = fork()) < 0) {
803 error("Couldn't detach (fork failed: %m)");
804 die(1); /* or just return? */
808 notify(pidchange, pid);
809 /* update pid files if they have been written already */
813 create_linkpidfile(pid);
814 exit(0); /* parent dies */
824 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
825 script_setenv("PPPD_PID", numbuf, 1);
827 /* wait for parent to finish updating pid & lock files and die */
829 complete_read(pipefd[0], numbuf, 1);
834 * reopen_log - (re)open our connection to syslog.
840 openlog("pppd", LOG_PID);
842 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
843 setlogmask(LOG_UPTO(LOG_INFO));
848 * Create a file containing our process ID.
856 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
857 _PATH_VARRUN, ifname);
858 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
859 fprintf(pidfile, "%d\n", pid);
860 (void) fclose(pidfile);
862 error("Failed to create pid file %s: %m", pidfilename);
868 create_linkpidfile(pid)
873 if (linkname[0] == 0)
875 script_setenv("LINKNAME", linkname, 1);
876 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
877 _PATH_VARRUN, linkname);
878 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
879 fprintf(pidfile, "%d\n", pid);
881 fprintf(pidfile, "%s\n", ifname);
882 (void) fclose(pidfile);
884 error("Failed to create pid file %s: %m", linkpidfile);
890 * holdoff_end - called via a timeout when the holdoff period ends.
896 new_phase(PHASE_DORMANT);
899 /* List of protocol names, to make our messages a little more informative. */
900 struct protocol_list {
903 } protocol_list[] = {
905 { 0x23, "OSI Network Layer" },
906 { 0x25, "Xerox NS IDP" },
907 { 0x27, "DECnet Phase IV" },
908 { 0x29, "Appletalk" },
909 { 0x2b, "Novell IPX" },
910 { 0x2d, "VJ compressed TCP/IP" },
911 { 0x2f, "VJ uncompressed TCP/IP" },
912 { 0x31, "Bridging PDU" },
913 { 0x33, "Stream Protocol ST-II" },
914 { 0x35, "Banyan Vines" },
915 { 0x39, "AppleTalk EDDP" },
916 { 0x3b, "AppleTalk SmartBuffered" },
917 { 0x3d, "Multi-Link" },
918 { 0x3f, "NETBIOS Framing" },
919 { 0x41, "Cisco Systems" },
920 { 0x43, "Ascom Timeplex" },
921 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
922 { 0x47, "DCA Remote Lan" },
923 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
924 { 0x4b, "SNA over 802.2" },
926 { 0x4f, "IP6 Header Compression" },
927 { 0x6f, "Stampede Bridging" },
928 { 0xfb, "single-link compression" },
929 { 0xfd, "1st choice compression" },
930 { 0x0201, "802.1d Hello Packets" },
931 { 0x0203, "IBM Source Routing BPDU" },
932 { 0x0205, "DEC LANBridge100 Spanning Tree" },
933 { 0x0231, "Luxcom" },
934 { 0x0233, "Sigma Network Systems" },
935 { 0x8021, "Internet Protocol Control Protocol" },
936 { 0x8023, "OSI Network Layer Control Protocol" },
937 { 0x8025, "Xerox NS IDP Control Protocol" },
938 { 0x8027, "DECnet Phase IV Control Protocol" },
939 { 0x8029, "Appletalk Control Protocol" },
940 { 0x802b, "Novell IPX Control Protocol" },
941 { 0x8031, "Bridging NCP" },
942 { 0x8033, "Stream Protocol Control Protocol" },
943 { 0x8035, "Banyan Vines Control Protocol" },
944 { 0x803d, "Multi-Link Control Protocol" },
945 { 0x803f, "NETBIOS Framing Control Protocol" },
946 { 0x8041, "Cisco Systems Control Protocol" },
947 { 0x8043, "Ascom Timeplex" },
948 { 0x8045, "Fujitsu LBLB Control Protocol" },
949 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
950 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
951 { 0x804b, "SNA over 802.2 Control Protocol" },
952 { 0x804d, "SNA Control Protocol" },
953 { 0x804f, "IP6 Header Compression Control Protocol" },
954 { 0x006f, "Stampede Bridging Control Protocol" },
955 { 0x80fb, "Single Link Compression Control Protocol" },
956 { 0x80fd, "Compression Control Protocol" },
957 { 0xc021, "Link Control Protocol" },
958 { 0xc023, "Password Authentication Protocol" },
959 { 0xc025, "Link Quality Report" },
960 { 0xc027, "Shiva Password Authentication Protocol" },
961 { 0xc029, "CallBack Control Protocol (CBCP)" },
962 { 0xc081, "Container Control Protocol" },
963 { 0xc223, "Challenge Handshake Authentication Protocol" },
964 { 0xc281, "Proprietary Authentication Protocol" },
969 * protocol_name - find a name for a PPP protocol.
975 struct protocol_list *lp;
977 for (lp = protocol_list; lp->proto != 0; ++lp)
978 if (proto == lp->proto)
984 * get_input - called when incoming data is available.
992 struct protent *protp;
994 p = inpacket_buf; /* point to beginning of packet buffer */
996 len = read_packet(inpacket_buf);
1001 notice("Modem hangup");
1003 status = EXIT_HANGUP;
1004 lcp_lowerdown(0); /* serial link is no longer available */
1009 if (len < PPP_HDRLEN) {
1010 dbglog("received short packet:%.*B", len, p);
1014 dump_packet("rcvd", p, len);
1015 if (snoop_recv_hook) snoop_recv_hook(p, len);
1017 p += 2; /* Skip address and control */
1018 GETSHORT(protocol, p);
1022 * Toss all non-LCP packets unless LCP is OPEN.
1024 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1025 dbglog("Discarded non-LCP packet when LCP not open");
1030 * Until we get past the authentication phase, toss all packets
1031 * except LCP, LQR and authentication packets.
1033 if (phase <= PHASE_AUTHENTICATE
1034 && !(protocol == PPP_LCP || protocol == PPP_LQR
1035 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1036 protocol == PPP_EAP)) {
1037 dbglog("discarding proto 0x%x in phase %d",
1043 * Upcall the proper protocol input routine.
1045 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1046 if (protp->protocol == protocol && protp->enabled_flag) {
1047 (*protp->input)(0, p, len);
1050 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1051 && protp->datainput != NULL) {
1052 (*protp->datainput)(0, p, len);
1058 const char *pname = protocol_name(protocol);
1060 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1062 warn("Unsupported protocol 0x%x received", protocol);
1064 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1068 * ppp_send_config - configure the transmit-side characteristics of
1069 * the ppp interface. Returns -1, indicating an error, if the channel
1070 * send_config procedure called error() (or incremented error_count
1071 * itself), otherwise 0.
1074 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1081 if (the_channel->send_config == NULL)
1084 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1085 return (error_count != errs)? -1: 0;
1089 * ppp_recv_config - configure the receive-side characteristics of
1090 * the ppp interface. Returns -1, indicating an error, if the channel
1091 * recv_config procedure called error() (or incremented error_count
1092 * itself), otherwise 0.
1095 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1102 if (the_channel->recv_config == NULL)
1105 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1106 return (error_count != errs)? -1: 0;
1110 * new_phase - signal the start of a new phase of pppd's operation.
1118 (*new_phase_hook)(p);
1119 notify(phasechange, p);
1123 * die - clean up state and exit with the specified status.
1131 notify(exitnotify, status);
1132 syslog(LOG_INFO, "Exit.");
1137 * cleanup - restore anything which needs to be restored before we exit
1146 the_channel->disestablish_ppp(devfd);
1147 if (the_channel->cleanup)
1148 (*the_channel->cleanup)();
1150 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1151 warn("unable to delete pid file %s: %m", pidfilename);
1153 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1154 warn("unable to delete pid file %s: %m", linkpidfile);
1168 * Print connect time and statistics.
1170 if (link_stats_valid) {
1171 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1172 info("Connect time %d.%d minutes.", t/10, t%10);
1173 info("Sent %u bytes, received %u bytes.",
1174 link_stats.bytes_out, link_stats.bytes_in);
1179 * update_link_stats - get stats at link termination.
1182 update_link_stats(u)
1188 if (!get_ppp_stats(u, &link_stats)
1189 || gettimeofday(&now, NULL) < 0)
1191 link_connect_time = now.tv_sec - start_time.tv_sec;
1192 link_stats_valid = 1;
1194 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1195 script_setenv("CONNECT_TIME", numbuf, 0);
1196 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1197 script_setenv("BYTES_SENT", numbuf, 0);
1198 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1199 script_setenv("BYTES_RCVD", numbuf, 0);
1204 struct timeval c_time; /* time at which to call routine */
1205 void *c_arg; /* argument to routine */
1206 void (*c_func) __P((void *)); /* routine */
1207 struct callout *c_next;
1210 static struct callout *callout = NULL; /* Callout list */
1211 static struct timeval timenow; /* Current time */
1214 * timeout - Schedule a timeout.
1217 timeout(func, arg, secs, usecs)
1218 void (*func) __P((void *));
1222 struct callout *newp, *p, **pp;
1224 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1230 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1231 fatal("Out of memory in timeout()!");
1233 newp->c_func = func;
1234 gettimeofday(&timenow, NULL);
1235 newp->c_time.tv_sec = timenow.tv_sec + secs;
1236 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1237 if (newp->c_time.tv_usec >= 1000000) {
1238 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1239 newp->c_time.tv_usec %= 1000000;
1243 * Find correct place and link it in.
1245 for (pp = &callout; (p = *pp); pp = &p->c_next)
1246 if (newp->c_time.tv_sec < p->c_time.tv_sec
1247 || (newp->c_time.tv_sec == p->c_time.tv_sec
1248 && newp->c_time.tv_usec < p->c_time.tv_usec))
1256 * untimeout - Unschedule a timeout.
1259 untimeout(func, arg)
1260 void (*func) __P((void *));
1263 struct callout **copp, *freep;
1265 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1268 * Find first matching timeout and remove it from the list.
1270 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1271 if (freep->c_func == func && freep->c_arg == arg) {
1272 *copp = freep->c_next;
1273 free((char *) freep);
1280 * calltimeout - Call any timeout routines which are now due.
1287 while (callout != NULL) {
1290 if (gettimeofday(&timenow, NULL) < 0)
1291 fatal("Failed to get time of day: %m");
1292 if (!(p->c_time.tv_sec < timenow.tv_sec
1293 || (p->c_time.tv_sec == timenow.tv_sec
1294 && p->c_time.tv_usec <= timenow.tv_usec)))
1295 break; /* no, it's not time yet */
1297 callout = p->c_next;
1298 (*p->c_func)(p->c_arg);
1306 * timeleft - return the length of time until the next timeout is due.
1308 static struct timeval *
1310 struct timeval *tvp;
1312 if (callout == NULL)
1315 gettimeofday(&timenow, NULL);
1316 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1317 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1318 if (tvp->tv_usec < 0) {
1319 tvp->tv_usec += 1000000;
1322 if (tvp->tv_sec < 0)
1323 tvp->tv_sec = tvp->tv_usec = 0;
1330 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1336 struct sigaction act, oldact;
1338 act.sa_handler = SIG_IGN;
1341 sigaction(sig, &act, &oldact);
1342 sigaction(sig, &oldact, NULL);
1347 * hup - Catch SIGHUP signal.
1349 * Indicates that the physical layer has been disconnected.
1350 * We don't rely on this indication; if the user has sent this
1351 * signal, we just take the link down.
1357 info("Hangup (SIGHUP)");
1360 /* Send the signal to the [dis]connector process(es) also */
1362 notify(sigreceived, sig);
1364 siglongjmp(sigjmp, 1);
1369 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1371 * Indicates that we should initiate a graceful disconnect and exit.
1378 info("Terminating on signal %d.", sig);
1381 /* Send the signal to the [dis]connector process(es) also */
1383 notify(sigreceived, sig);
1385 siglongjmp(sigjmp, 1);
1390 * chld - Catch SIGCHLD signal.
1391 * Sets a flag so we will call reap_kids in the mainline.
1399 siglongjmp(sigjmp, 1);
1404 * toggle_debug - Catch SIGUSR1 signal.
1406 * Toggle debug flag.
1415 setlogmask(LOG_UPTO(LOG_DEBUG));
1417 setlogmask(LOG_UPTO(LOG_WARNING));
1423 * open_ccp - Catch SIGUSR2 signal.
1425 * Try to (re)negotiate compression.
1434 siglongjmp(sigjmp, 1);
1439 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1445 static int crashed = 0;
1450 error("Fatal signal %d", sig);
1452 kill_my_pg(SIGTERM);
1453 notify(sigreceived, sig);
1458 * safe_fork - Create a child process. The child closes all the
1459 * file descriptors that we don't want to leak to a script.
1460 * The parent waits for the child to do this before returning.
1469 if (pipe(pipefd) == -1)
1470 pipefd[0] = pipefd[1] = -1;
1476 /* this read() blocks until the close(pipefd[1]) below */
1477 complete_read(pipefd[0], buf, 1);
1485 notify(fork_notifier, 0);
1487 /* this close unblocks the read() call above in the parent */
1493 * device_script - run a program to talk to the specified fds
1494 * (e.g. to run the connector or disconnector script).
1495 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1498 device_script(program, in, out, dont_wait)
1512 error("Failed to create child process: %m");
1518 record_child(pid, program, NULL, NULL);
1521 while (waitpid(pid, &status, 0) < 0) {
1524 fatal("error waiting for (dis)connection process: %m");
1528 return (status == 0 ? 0 : -1);
1531 /* here we are executing in the child */
1533 /* dup in and out to fds > 2 */
1535 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1539 if (log_to_fd >= 0) {
1540 errfd = dup(log_to_fd);
1542 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1549 /* close fds 0 - 2 and any others we can think of */
1553 if (the_channel->close)
1554 (*the_channel->close)();
1558 /* dup the in, out, err fds to 0, 1, 2 */
1569 if (getuid() != uid) {
1570 error("setuid failed");
1574 execl("/bin/sh", "sh", "-c", program, (char *)0);
1575 error("could not exec /bin/sh: %m");
1582 * run-program - execute a program with given arguments,
1583 * but don't wait for it.
1584 * If the program can't be executed, logs an error unless
1585 * must_exist is 0 and the program file doesn't exist.
1586 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1587 * or isn't an executable plain file, or the process ID of the child.
1588 * If done != NULL, (*done)(arg) will be called later (within
1589 * reap_kids) iff the return value is > 0.
1592 run_program(prog, args, must_exist, done, arg)
1596 void (*done) __P((void *));
1603 * First check if the file exists and is executable.
1604 * We don't use access() because that would use the
1605 * real user-id, which might not be root, and the script
1606 * might be accessible only to root.
1609 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1610 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1611 if (must_exist || errno != ENOENT)
1612 warn("Can't execute %s: %m", prog);
1618 error("Failed to create child process for %s: %m", prog);
1623 dbglog("Script %s started (pid %d)", prog, pid);
1624 record_child(pid, prog, done, arg);
1628 /* Leave the current location */
1629 (void) setsid(); /* No controlling tty. */
1630 (void) umask (S_IRWXG|S_IRWXO);
1631 (void) chdir ("/"); /* no current directory. */
1632 setuid(0); /* set real UID = root */
1635 /* Ensure that nothing of our device environment is inherited. */
1637 if (the_channel->close)
1638 (*the_channel->close)();
1640 /* Don't pass handles to the PPP device, even by accident. */
1641 dup2(fd_devnull, 0);
1642 dup2(fd_devnull, 1);
1643 dup2(fd_devnull, 2);
1647 /* Force the priority back to zero if pppd is running higher. */
1648 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1649 warn("can't reset priority to 0: %m");
1652 /* SysV recommends a second fork at this point. */
1654 /* run the program */
1655 execve(prog, args, script_env);
1656 if (must_exist || errno != ENOENT) {
1657 /* have to reopen the log, there's nowhere else
1658 for the message to go. */
1660 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1668 * record_child - add a child process to the list for reap_kids
1672 record_child(pid, prog, done, arg)
1675 void (*done) __P((void *));
1678 struct subprocess *chp;
1682 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1684 warn("losing track of %s process", prog);
1690 chp->next = children;
1697 * reap_kids - get status from any dead child processes,
1698 * and log a message for abnormal terminations.
1705 struct subprocess *chp, **prevp;
1707 if (n_children == 0)
1709 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1711 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1712 if (chp->pid == pid) {
1718 if (WIFSIGNALED(status)) {
1719 warn("Child process %s (pid %d) terminated with signal %d",
1720 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1722 dbglog("Script %s finished (pid %d), status = 0x%x",
1723 (chp? chp->prog: "??"), pid,
1724 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1725 if (chp && chp->done)
1726 (*chp->done)(chp->arg);
1731 if (errno == ECHILD)
1734 error("Error waiting for child process: %m");
1740 * add_notifier - add a new function to be called when something happens.
1743 add_notifier(notif, func, arg)
1744 struct notifier **notif;
1748 struct notifier *np;
1750 np = malloc(sizeof(struct notifier));
1752 novm("notifier struct");
1760 * remove_notifier - remove a function from the list of things to
1761 * be called when something happens.
1764 remove_notifier(notif, func, arg)
1765 struct notifier **notif;
1769 struct notifier *np;
1771 for (; (np = *notif) != 0; notif = &np->next) {
1772 if (np->func == func && np->arg == arg) {
1781 * notify - call a set of functions registered with add_notifier.
1785 struct notifier *notif;
1788 struct notifier *np;
1790 while ((np = notif) != 0) {
1792 (*np->func)(np->arg, val);
1797 * novm - log an error message saying we ran out of memory, and die.
1803 fatal("Virtual memory exhausted allocating %s\n", msg);
1807 * script_setenv - set an environment variable value to be used
1808 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1811 script_setenv(var, value, iskey)
1815 size_t varl = strlen(var);
1816 size_t vl = varl + strlen(value) + 2;
1818 char *p, *newstring;
1820 newstring = (char *) malloc(vl+1);
1823 *newstring++ = iskey;
1824 slprintf(newstring, vl, "%s=%s", var, value);
1826 /* check if this variable is already set */
1827 if (script_env != 0) {
1828 for (i = 0; (p = script_env[i]) != 0; ++i) {
1829 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1831 if (p[-1] && pppdb != NULL)
1835 script_env[i] = newstring;
1837 if (iskey && pppdb != NULL)
1838 add_db_key(newstring);
1845 /* no space allocated for script env. ptrs. yet */
1847 script_env = (char **) malloc(16 * sizeof(char *));
1848 if (script_env == 0)
1853 /* reallocate script_env with more space if needed */
1854 if (i + 1 >= s_env_nalloc) {
1856 char **newenv = (char **) realloc((void *)script_env,
1857 new_n * sizeof(char *));
1860 script_env = newenv;
1861 s_env_nalloc = new_n;
1864 script_env[i] = newstring;
1865 script_env[i+1] = 0;
1868 if (pppdb != NULL) {
1870 add_db_key(newstring);
1877 * script_unsetenv - remove a variable from the environment
1881 script_unsetenv(var)
1884 int vl = strlen(var);
1888 if (script_env == 0)
1890 for (i = 0; (p = script_env[i]) != 0; ++i) {
1891 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1893 if (p[-1] && pppdb != NULL)
1897 while ((script_env[i] = script_env[i+1]) != 0)
1910 * update_db_entry - update our entry in the database.
1919 if (script_env == NULL)
1922 for (i = 0; (p = script_env[i]) != 0; ++i)
1923 vlen += strlen(p) + 1;
1924 vbuf = malloc(vlen);
1926 novm("database entry");
1928 for (i = 0; (p = script_env[i]) != 0; ++i)
1929 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1932 key.dsize = strlen(db_key);
1935 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1936 error("tdb_store failed: %s", tdb_error(pppdb));
1944 * add_db_key - add a key that we can use to look up our database entry.
1952 key.dptr = (char *) str;
1953 key.dsize = strlen(str);
1955 dbuf.dsize = strlen(db_key);
1956 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1957 error("tdb_store key failed: %s", tdb_error(pppdb));
1961 * delete_db_key - delete a key for looking up our database entry.
1969 key.dptr = (char *) str;
1970 key.dsize = strlen(str);
1971 tdb_delete(pppdb, key);
1975 * cleanup_db - delete all the entries we put in the database.
1985 key.dsize = strlen(db_key);
1986 tdb_delete(pppdb, key);
1987 for (i = 0; (p = script_env[i]) != 0; ++i)
1991 #endif /* USE_TDB */