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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43 #define RCSID "$Id: main.c,v 1.136 2004/04/12 11:20:19 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 */
153 static sigset_t signals_handled;
155 static sigjmp_buf sigjmp;
157 char **script_env; /* Env. variable values for scripts */
158 int s_env_nalloc; /* # words avail at script_env */
160 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
161 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
163 static int n_children; /* # child processes still running */
164 static int got_sigchld; /* set if we have received a SIGCHLD */
166 int privopen; /* don't lock, open device as root */
168 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
170 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
171 int ngroups; /* How many groups valid in groups */
173 static struct timeval start_time; /* Time when link was started. */
175 struct pppd_stats link_stats;
176 unsigned link_connect_time;
177 int link_stats_valid;
182 * We maintain a list of child process pids and
183 * functions to call when they exit.
188 void (*done) __P((void *));
190 struct subprocess *next;
193 static struct subprocess *children;
195 /* Prototypes for procedures local to this file. */
197 static void setup_signals __P((void));
198 static void create_pidfile __P((int pid));
199 static void create_linkpidfile __P((int pid));
200 static void cleanup __P((void));
201 static void get_input __P((void));
202 static void calltimeout __P((void));
203 static struct timeval *timeleft __P((struct timeval *));
204 static void kill_my_pg __P((int));
205 static void hup __P((int));
206 static void term __P((int));
207 static void chld __P((int));
208 static void toggle_debug __P((int));
209 static void open_ccp __P((int));
210 static void bad_signal __P((int));
211 static void holdoff_end __P((void *));
212 static int reap_kids __P((int waitfor));
215 static void update_db_entry __P((void));
216 static void add_db_key __P((const char *));
217 static void delete_db_key __P((const char *));
218 static void cleanup_db __P((void));
221 static void handle_events __P((void));
222 static void print_link_stats __P((void));
224 extern char *ttyname __P((int));
225 extern char *getlogin __P((void));
226 int main __P((int, char *[]));
230 #define O_NONBLOCK O_NDELAY
234 #define setlogmask(x)
238 * PPP Data Link Layer "protocol" table.
239 * One entry per supported protocol.
240 * The last entry must be NULL.
242 struct protent *protocols[] = {
266 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
268 #if !defined(PPP_DRV_NAME)
269 #define PPP_DRV_NAME "ppp"
270 #endif /* !defined(PPP_DRV_NAME) */
280 struct protent *protp;
283 link_stats_valid = 0;
284 new_phase(PHASE_INITIALIZE);
288 /* Initialize syslog facilities */
291 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
292 option_error("Couldn't get hostname: %m");
295 hostname[MAXNAMELEN-1] = 0;
297 /* make sure we don't create world or group writable files. */
298 umask(umask(0777) | 022);
301 privileged = uid == 0;
302 slprintf(numbuf, sizeof(numbuf), "%d", uid);
303 script_setenv("ORIG_UID", numbuf, 0);
305 ngroups = getgroups(NGROUPS_MAX, groups);
308 * Initialize magic number generator now so that protocols may
309 * use magic numbers in initialization.
314 * Initialize each protocol.
316 for (i = 0; (protp = protocols[i]) != NULL; ++i)
320 * Initialize the default channel.
327 * Parse, in order, the system options file, the user's options file,
328 * and the command line arguments.
330 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
331 || !options_from_user()
332 || !parse_args(argc-1, argv+1))
333 exit(EXIT_OPTION_ERROR);
334 devnam_fixed = 1; /* can no longer change device name */
337 * Work out the device name, if it hasn't already been specified,
338 * and parse the tty's options file.
340 if (the_channel->process_extra_options)
341 (*the_channel->process_extra_options)();
344 setlogmask(LOG_UPTO(LOG_DEBUG));
347 * Check that we are running as root.
349 if (geteuid() != 0) {
350 option_error("must be root to run %s, since it is not setuid-root",
355 if (!ppp_available()) {
356 option_error("%s", no_ppp_msg);
357 exit(EXIT_NO_KERNEL_SUPPORT);
361 * Check that the options given are valid and consistent.
364 if (!sys_check_options())
365 exit(EXIT_OPTION_ERROR);
366 auth_check_options();
367 #ifdef HAVE_MULTILINK
370 for (i = 0; (protp = protocols[i]) != NULL; ++i)
371 if (protp->check_options != NULL)
372 (*protp->check_options)();
373 if (the_channel->check_options)
374 (*the_channel->check_options)();
377 if (dump_options || dryrun) {
378 init_pr_log(NULL, LOG_INFO);
379 print_options(pr_log, NULL);
387 * Initialize system-dependent stuff.
391 /* Make sure fds 0, 1, 2 are open to somewhere. */
392 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
394 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
395 while (fd_devnull <= 2) {
398 fatal("Critical shortage of file descriptors: dup failed: %m");
403 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
405 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
408 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
410 warn("Warning: disabling multilink");
417 * Detach ourselves from the terminal, if required,
418 * and identify who is running us.
420 if (!nodetach && !updetach)
425 if (pw != NULL && pw->pw_name != NULL)
430 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
431 script_setenv("PPPLOGNAME", p, 0);
434 script_setenv("DEVICE", devnam, 1);
435 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
436 script_setenv("PPPD_PID", numbuf, 1);
443 * If we're doing dial-on-demand, set up the interface now.
447 * Open the loopback channel and set it up to be the ppp interface.
450 tdb_writelock(pppdb);
452 fd_loop = open_ppp_loopback();
455 tdb_writeunlock(pppdb);
458 * Configure the interface and mark it up, etc.
461 create_linkpidfile(getpid());
472 doing_callback = do_callback;
475 if (demand && !doing_callback) {
477 * Don't do anything until we see some activity.
479 new_phase(PHASE_DORMANT);
484 if (kill_link && !persist)
486 if (get_loop_output())
490 if (kill_link && !persist)
494 * Now we want to bring up the link.
497 info("Starting link");
500 new_phase(PHASE_SERIALCONN);
502 devfd = the_channel->connect();
506 /* set up the serial device as a ppp interface */
508 tdb_writelock(pppdb);
510 fd_ppp = the_channel->establish_ppp(devfd);
513 tdb_writeunlock(pppdb);
515 status = EXIT_FATAL_ERROR;
518 /* create the pid file, now that we've obtained a ppp interface */
520 create_linkpidfile(getpid());
522 if (!demand && ifunit >= 0)
525 tdb_writeunlock(pppdb);
529 * Start opening the connection and wait for
530 * incoming events (reply, timeout, etc.).
533 notice("Connect: %s <--> %s", ifname, ppp_devnam);
535 notice("Starting negotiation on %s", ppp_devnam);
536 gettimeofday(&start_time, NULL);
537 script_unsetenv("CONNECT_TIME");
538 script_unsetenv("BYTES_SENT");
539 script_unsetenv("BYTES_RCVD");
543 lcp_open(0); /* Start protocol */
544 status = EXIT_NEGOTIATION_FAILED;
545 new_phase(PHASE_ESTABLISH);
546 while (phase != PHASE_DEAD) {
550 lcp_close(0, "User request");
552 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
553 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
554 (*ccp_protent.open)(0);
562 * Delete pid file before disestablishing ppp. Otherwise it
563 * can happen that another pppd gets the same unit and then
564 * we delete its pid file.
567 if (pidfilename[0] != 0
568 && unlink(pidfilename) < 0 && errno != ENOENT)
569 warn("unable to delete pid file %s: %m", pidfilename);
574 * If we may want to bring the link up again, transfer
575 * the ppp unit back to the loopback. Set the
576 * real serial device back to its normal mode of operation.
580 the_channel->disestablish_ppp(devfd);
585 script_unsetenv("IFNAME");
588 * Run disconnector script, if requested.
589 * XXX we may not be able to do this if the line has hung up!
592 new_phase(PHASE_DISCONNECT);
593 if (the_channel->disconnect)
594 the_channel->disconnect();
597 if (the_channel->cleanup)
598 (*the_channel->cleanup)();
601 if (pidfilename[0] != 0
602 && unlink(pidfilename) < 0 && errno != ENOENT)
603 warn("unable to delete pid file %s: %m", pidfilename);
607 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
612 t = need_holdoff? holdoff: 0;
614 t = (*holdoff_hook)();
616 new_phase(PHASE_HOLDOFF);
617 TIMEOUT(holdoff_end, NULL, t);
621 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
622 } while (phase == PHASE_HOLDOFF);
628 /* Wait for scripts to finish */
629 /* XXX should have a timeout here */
630 while (n_children > 0) {
632 struct subprocess *chp;
633 dbglog("Waiting for %d child processes...", n_children);
634 for (chp = children; chp != NULL; chp = chp->next)
635 dbglog(" script %s, pid %d", chp->prog, chp->pid);
637 if (reap_kids(1) < 0)
646 * handle_events - wait for something to happen and respond to it.
653 kill_link = open_ccp_flag = 0;
654 if (sigsetjmp(sigjmp, 1) == 0) {
655 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
656 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
657 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
660 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
661 wait_input(timeleft(&timo));
669 if (status != EXIT_HANGUP)
670 status = EXIT_USER_REQUEST;
675 status = EXIT_USER_REQUEST;
679 reap_kids(0); /* Don't leave dead kids lying around */
689 * 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.
701 sigemptyset(&signals_handled);
702 sigaddset(&signals_handled, SIGHUP);
703 sigaddset(&signals_handled, SIGINT);
704 sigaddset(&signals_handled, SIGTERM);
705 sigaddset(&signals_handled, SIGCHLD);
706 sigaddset(&signals_handled, 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); \
714 sa.sa_mask = signals_handled;
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);
1175 link_stats_valid = 0;
1180 * update_link_stats - get stats at link termination.
1183 update_link_stats(u)
1189 if (!get_ppp_stats(u, &link_stats)
1190 || gettimeofday(&now, NULL) < 0)
1192 link_connect_time = now.tv_sec - start_time.tv_sec;
1193 link_stats_valid = 1;
1195 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1196 script_setenv("CONNECT_TIME", numbuf, 0);
1197 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1198 script_setenv("BYTES_SENT", numbuf, 0);
1199 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1200 script_setenv("BYTES_RCVD", numbuf, 0);
1205 struct timeval c_time; /* time at which to call routine */
1206 void *c_arg; /* argument to routine */
1207 void (*c_func) __P((void *)); /* routine */
1208 struct callout *c_next;
1211 static struct callout *callout = NULL; /* Callout list */
1212 static struct timeval timenow; /* Current time */
1215 * timeout - Schedule a timeout.
1218 timeout(func, arg, secs, usecs)
1219 void (*func) __P((void *));
1223 struct callout *newp, *p, **pp;
1225 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1231 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1232 fatal("Out of memory in timeout()!");
1234 newp->c_func = func;
1235 gettimeofday(&timenow, NULL);
1236 newp->c_time.tv_sec = timenow.tv_sec + secs;
1237 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1238 if (newp->c_time.tv_usec >= 1000000) {
1239 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1240 newp->c_time.tv_usec %= 1000000;
1244 * Find correct place and link it in.
1246 for (pp = &callout; (p = *pp); pp = &p->c_next)
1247 if (newp->c_time.tv_sec < p->c_time.tv_sec
1248 || (newp->c_time.tv_sec == p->c_time.tv_sec
1249 && newp->c_time.tv_usec < p->c_time.tv_usec))
1257 * untimeout - Unschedule a timeout.
1260 untimeout(func, arg)
1261 void (*func) __P((void *));
1264 struct callout **copp, *freep;
1266 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1269 * Find first matching timeout and remove it from the list.
1271 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1272 if (freep->c_func == func && freep->c_arg == arg) {
1273 *copp = freep->c_next;
1274 free((char *) freep);
1281 * calltimeout - Call any timeout routines which are now due.
1288 while (callout != NULL) {
1291 if (gettimeofday(&timenow, NULL) < 0)
1292 fatal("Failed to get time of day: %m");
1293 if (!(p->c_time.tv_sec < timenow.tv_sec
1294 || (p->c_time.tv_sec == timenow.tv_sec
1295 && p->c_time.tv_usec <= timenow.tv_usec)))
1296 break; /* no, it's not time yet */
1298 callout = p->c_next;
1299 (*p->c_func)(p->c_arg);
1307 * timeleft - return the length of time until the next timeout is due.
1309 static struct timeval *
1311 struct timeval *tvp;
1313 if (callout == NULL)
1316 gettimeofday(&timenow, NULL);
1317 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1318 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1319 if (tvp->tv_usec < 0) {
1320 tvp->tv_usec += 1000000;
1323 if (tvp->tv_sec < 0)
1324 tvp->tv_sec = tvp->tv_usec = 0;
1331 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1332 * We assume that sig is currently blocked.
1338 struct sigaction act, oldact;
1340 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1341 act.sa_handler = SIG_IGN;
1345 * The kill() above made the signal pending for us, as well as
1346 * the rest of our process group, but we don't want it delivered
1347 * to us. It is blocked at the moment. Setting it to be ignored
1348 * will cause the pending signal to be discarded. If we did the
1349 * kill() after setting the signal to be ignored, it is unspecified
1350 * (by POSIX) whether the signal is immediately discarded or left
1351 * pending, and in fact Linux would leave it pending, and so it
1352 * would be delivered after the current signal handler exits,
1353 * leading to an infinite loop.
1355 sigaction(sig, &act, &oldact);
1356 sigaction(sig, &oldact, NULL);
1361 * hup - Catch SIGHUP signal.
1363 * Indicates that the physical layer has been disconnected.
1364 * We don't rely on this indication; if the user has sent this
1365 * signal, we just take the link down.
1371 info("Hangup (SIGHUP)");
1374 /* Send the signal to the [dis]connector process(es) also */
1376 notify(sigreceived, sig);
1378 siglongjmp(sigjmp, 1);
1383 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1385 * Indicates that we should initiate a graceful disconnect and exit.
1392 info("Terminating on signal %d.", sig);
1395 /* Send the signal to the [dis]connector process(es) also */
1397 notify(sigreceived, sig);
1399 siglongjmp(sigjmp, 1);
1404 * chld - Catch SIGCHLD signal.
1405 * Sets a flag so we will call reap_kids in the mainline.
1413 siglongjmp(sigjmp, 1);
1418 * toggle_debug - Catch SIGUSR1 signal.
1420 * Toggle debug flag.
1429 setlogmask(LOG_UPTO(LOG_DEBUG));
1431 setlogmask(LOG_UPTO(LOG_WARNING));
1437 * open_ccp - Catch SIGUSR2 signal.
1439 * Try to (re)negotiate compression.
1448 siglongjmp(sigjmp, 1);
1453 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1459 static int crashed = 0;
1464 error("Fatal signal %d", sig);
1466 kill_my_pg(SIGTERM);
1467 notify(sigreceived, sig);
1472 * safe_fork - Create a child process. The child closes all the
1473 * file descriptors that we don't want to leak to a script.
1474 * The parent waits for the child to do this before returning.
1483 if (pipe(pipefd) == -1)
1484 pipefd[0] = pipefd[1] = -1;
1490 /* this read() blocks until the close(pipefd[1]) below */
1491 complete_read(pipefd[0], buf, 1);
1499 notify(fork_notifier, 0);
1501 /* this close unblocks the read() call above in the parent */
1507 * device_script - run a program to talk to the specified fds
1508 * (e.g. to run the connector or disconnector script).
1509 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1512 device_script(program, in, out, dont_wait)
1527 error("Failed to create child process: %m");
1533 record_child(pid, program, NULL, NULL);
1536 while (waitpid(pid, &status, 0) < 0) {
1539 fatal("error waiting for (dis)connection process: %m");
1543 return (status == 0 ? 0 : -1);
1546 /* here we are executing in the child */
1548 /* make sure fds 0, 1, 2 are occupied */
1549 while ((fd = dup(in)) >= 0) {
1556 /* dup in and out to fds > 2 */
1558 int fd1 = in, fd2 = out, fd3 = log_to_fd;
1562 if (log_to_fd >= 0) {
1563 errfd = dup(log_to_fd);
1565 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1572 /* close fds 0 - 2 and any others we can think of */
1576 if (the_channel->close)
1577 (*the_channel->close)();
1581 /* dup the in, out, err fds to 0, 1, 2 */
1592 if (getuid() != uid) {
1593 error("setuid failed");
1597 execl("/bin/sh", "sh", "-c", program, (char *)0);
1598 error("could not exec /bin/sh: %m");
1605 * run-program - execute a program with given arguments,
1606 * but don't wait for it.
1607 * If the program can't be executed, logs an error unless
1608 * must_exist is 0 and the program file doesn't exist.
1609 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1610 * or isn't an executable plain file, or the process ID of the child.
1611 * If done != NULL, (*done)(arg) will be called later (within
1612 * reap_kids) iff the return value is > 0.
1615 run_program(prog, args, must_exist, done, arg)
1619 void (*done) __P((void *));
1626 * First check if the file exists and is executable.
1627 * We don't use access() because that would use the
1628 * real user-id, which might not be root, and the script
1629 * might be accessible only to root.
1632 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1633 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1634 if (must_exist || errno != ENOENT)
1635 warn("Can't execute %s: %m", prog);
1641 error("Failed to create child process for %s: %m", prog);
1646 dbglog("Script %s started (pid %d)", prog, pid);
1647 record_child(pid, prog, done, arg);
1651 /* Leave the current location */
1652 (void) setsid(); /* No controlling tty. */
1653 (void) umask (S_IRWXG|S_IRWXO);
1654 (void) chdir ("/"); /* no current directory. */
1655 setuid(0); /* set real UID = root */
1658 /* Ensure that nothing of our device environment is inherited. */
1660 if (the_channel->close)
1661 (*the_channel->close)();
1663 /* Don't pass handles to the PPP device, even by accident. */
1664 dup2(fd_devnull, 0);
1665 dup2(fd_devnull, 1);
1666 dup2(fd_devnull, 2);
1670 /* Force the priority back to zero if pppd is running higher. */
1671 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1672 warn("can't reset priority to 0: %m");
1675 /* SysV recommends a second fork at this point. */
1677 /* run the program */
1678 execve(prog, args, script_env);
1679 if (must_exist || errno != ENOENT) {
1680 /* have to reopen the log, there's nowhere else
1681 for the message to go. */
1683 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1691 * record_child - add a child process to the list for reap_kids
1695 record_child(pid, prog, done, arg)
1698 void (*done) __P((void *));
1701 struct subprocess *chp;
1705 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1707 warn("losing track of %s process", prog);
1713 chp->next = children;
1720 * reap_kids - get status from any dead child processes,
1721 * and log a message for abnormal terminations.
1728 struct subprocess *chp, **prevp;
1730 if (n_children == 0)
1732 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1734 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1735 if (chp->pid == pid) {
1741 if (WIFSIGNALED(status)) {
1742 warn("Child process %s (pid %d) terminated with signal %d",
1743 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1745 dbglog("Script %s finished (pid %d), status = 0x%x",
1746 (chp? chp->prog: "??"), pid,
1747 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1748 if (chp && chp->done)
1749 (*chp->done)(chp->arg);
1754 if (errno == ECHILD)
1757 error("Error waiting for child process: %m");
1763 * add_notifier - add a new function to be called when something happens.
1766 add_notifier(notif, func, arg)
1767 struct notifier **notif;
1771 struct notifier *np;
1773 np = malloc(sizeof(struct notifier));
1775 novm("notifier struct");
1783 * remove_notifier - remove a function from the list of things to
1784 * be called when something happens.
1787 remove_notifier(notif, func, arg)
1788 struct notifier **notif;
1792 struct notifier *np;
1794 for (; (np = *notif) != 0; notif = &np->next) {
1795 if (np->func == func && np->arg == arg) {
1804 * notify - call a set of functions registered with add_notifier.
1808 struct notifier *notif;
1811 struct notifier *np;
1813 while ((np = notif) != 0) {
1815 (*np->func)(np->arg, val);
1820 * novm - log an error message saying we ran out of memory, and die.
1826 fatal("Virtual memory exhausted allocating %s\n", msg);
1830 * script_setenv - set an environment variable value to be used
1831 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1834 script_setenv(var, value, iskey)
1838 size_t varl = strlen(var);
1839 size_t vl = varl + strlen(value) + 2;
1841 char *p, *newstring;
1843 newstring = (char *) malloc(vl+1);
1846 *newstring++ = iskey;
1847 slprintf(newstring, vl, "%s=%s", var, value);
1849 /* check if this variable is already set */
1850 if (script_env != 0) {
1851 for (i = 0; (p = script_env[i]) != 0; ++i) {
1852 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1854 if (p[-1] && pppdb != NULL)
1858 script_env[i] = newstring;
1860 if (iskey && pppdb != NULL)
1861 add_db_key(newstring);
1868 /* no space allocated for script env. ptrs. yet */
1870 script_env = (char **) malloc(16 * sizeof(char *));
1871 if (script_env == 0)
1876 /* reallocate script_env with more space if needed */
1877 if (i + 1 >= s_env_nalloc) {
1879 char **newenv = (char **) realloc((void *)script_env,
1880 new_n * sizeof(char *));
1883 script_env = newenv;
1884 s_env_nalloc = new_n;
1887 script_env[i] = newstring;
1888 script_env[i+1] = 0;
1891 if (pppdb != NULL) {
1893 add_db_key(newstring);
1900 * script_unsetenv - remove a variable from the environment
1904 script_unsetenv(var)
1907 int vl = strlen(var);
1911 if (script_env == 0)
1913 for (i = 0; (p = script_env[i]) != 0; ++i) {
1914 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1916 if (p[-1] && pppdb != NULL)
1920 while ((script_env[i] = script_env[i+1]) != 0)
1933 * update_db_entry - update our entry in the database.
1942 if (script_env == NULL)
1945 for (i = 0; (p = script_env[i]) != 0; ++i)
1946 vlen += strlen(p) + 1;
1947 vbuf = malloc(vlen);
1949 novm("database entry");
1951 for (i = 0; (p = script_env[i]) != 0; ++i)
1952 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1955 key.dsize = strlen(db_key);
1958 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1959 error("tdb_store failed: %s", tdb_error(pppdb));
1967 * add_db_key - add a key that we can use to look up our database entry.
1975 key.dptr = (char *) str;
1976 key.dsize = strlen(str);
1978 dbuf.dsize = strlen(db_key);
1979 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1980 error("tdb_store key failed: %s", tdb_error(pppdb));
1984 * delete_db_key - delete a key for looking up our database entry.
1992 key.dptr = (char *) str;
1993 key.dsize = strlen(str);
1994 tdb_delete(pppdb, key);
1998 * cleanup_db - delete all the entries we put in the database.
2008 key.dsize = strlen(db_key);
2009 tdb_delete(pppdb, key);
2010 for (i = 0; (p = script_env[i]) != 0; ++i)
2014 #endif /* USE_TDB */