2 * main.c - Point-to-Point Protocol main module
4 * Copyright (c) 1989 Carnegie Mellon University.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that the above copyright notice and this paragraph are
9 * duplicated in all such forms and that any documentation,
10 * advertising materials, and other materials related to such
11 * distribution and use acknowledge that the software was developed
12 * by Carnegie Mellon University. The name of the
13 * University may not be used to endorse or promote products derived
14 * from this software without specific prior written permission.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 #define RCSID "$Id: main.c,v 1.107 2001/05/23 03:39:13 paulus Exp $"
35 #include <sys/param.h>
36 #include <sys/types.h>
39 #include <sys/resource.h>
41 #include <sys/socket.h>
42 #include <netinet/in.h>
43 #include <arpa/inet.h>
56 #include "pathnames.h"
65 #endif /* IPX_CHANGE */
70 static const char rcsid[] = RCSID;
73 char ifname[32]; /* Interface name */
74 int ifunit; /* Interface unit number */
76 struct channel *the_channel;
78 char *progname; /* Name of this program */
79 char hostname[MAXNAMELEN]; /* Our hostname */
80 static char pidfilename[MAXPATHLEN]; /* name of pid file */
81 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
82 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
83 uid_t uid; /* Our real user-id */
84 struct notifier *pidchange = NULL;
85 struct notifier *phasechange = NULL;
86 struct notifier *exitnotify = NULL;
87 struct notifier *sigreceived = NULL;
89 int hungup; /* terminal has been hung up */
90 int privileged; /* we're running as real uid root */
91 int need_holdoff; /* need holdoff period before restarting */
92 int detached; /* have detached from terminal */
93 volatile int status; /* exit status for pppd */
94 int unsuccess; /* # unsuccessful connection attempts */
95 int do_callback; /* != 0 if we should do callback next */
96 int doing_callback; /* != 0 if we are doing callback */
97 TDB_CONTEXT *pppdb; /* database for storing status etc. */
100 int (*holdoff_hook) __P((void)) = NULL;
101 int (*new_phase_hook) __P((int)) = NULL;
103 static int conn_running; /* we have a [dis]connector running */
104 static int devfd; /* fd of underlying device */
105 static int fd_ppp = -1; /* fd for talking PPP */
106 static int fd_loop; /* fd for getting demand-dial packets */
108 int phase; /* where the link is at */
117 static sigjmp_buf sigjmp;
119 char **script_env; /* Env. variable values for scripts */
120 int s_env_nalloc; /* # words avail at script_env */
122 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
123 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
125 static int n_children; /* # child processes still running */
126 static int got_sigchld; /* set if we have received a SIGCHLD */
128 int privopen; /* don't lock, open device as root */
130 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
132 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
133 int ngroups; /* How many groups valid in groups */
135 static struct timeval start_time; /* Time when link was started. */
137 struct pppd_stats link_stats;
138 int link_connect_time;
139 int link_stats_valid;
142 * We maintain a list of child process pids and
143 * functions to call when they exit.
148 void (*done) __P((void *));
150 struct subprocess *next;
153 static struct subprocess *children;
155 /* Prototypes for procedures local to this file. */
157 static void setup_signals __P((void));
158 static void create_pidfile __P((void));
159 static void create_linkpidfile __P((void));
160 static void cleanup __P((void));
161 static void get_input __P((void));
162 static void calltimeout __P((void));
163 static struct timeval *timeleft __P((struct timeval *));
164 static void kill_my_pg __P((int));
165 static void hup __P((int));
166 static void term __P((int));
167 static void chld __P((int));
168 static void toggle_debug __P((int));
169 static void open_ccp __P((int));
170 static void bad_signal __P((int));
171 static void holdoff_end __P((void *));
172 static int reap_kids __P((int waitfor));
173 static void update_db_entry __P((void));
174 static void add_db_key __P((const char *));
175 static void delete_db_key __P((const char *));
176 static void cleanup_db __P((void));
177 static void handle_events __P((void));
179 extern char *ttyname __P((int));
180 extern char *getlogin __P((void));
181 int main __P((int, char *[]));
185 #define O_NONBLOCK O_NDELAY
189 #define setlogmask(x)
193 * PPP Data Link Layer "protocol" table.
194 * One entry per supported protocol.
195 * The last entry must be NULL.
197 struct protent *protocols[] = {
219 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
221 #if !defined(PPP_DRV_NAME)
222 #define PPP_DRV_NAME "ppp"
223 #endif /* !defined(PPP_DRV_NAME) */
233 struct protent *protp;
236 new_phase(PHASE_INITIALIZE);
239 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
240 * This way we can close 0, 1, 2 in detach() without clobbering
241 * a fd that we are using.
243 if ((i = open("/dev/null", O_RDWR)) >= 0) {
244 while (0 <= i && i <= 2)
252 /* Initialize syslog facilities */
255 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
256 option_error("Couldn't get hostname: %m");
259 hostname[MAXNAMELEN-1] = 0;
261 /* make sure we don't create world or group writable files. */
262 umask(umask(0777) | 022);
265 privileged = uid == 0;
266 slprintf(numbuf, sizeof(numbuf), "%d", uid);
267 script_setenv("ORIG_UID", numbuf, 0);
269 ngroups = getgroups(NGROUPS_MAX, groups);
272 * Initialize magic number generator now so that protocols may
273 * use magic numbers in initialization.
278 * Initialize each protocol.
280 for (i = 0; (protp = protocols[i]) != NULL; ++i)
284 * Initialize the default channel.
291 * Parse, in order, the system options file, the user's options file,
292 * and the command line arguments.
294 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
295 || !options_from_user()
296 || !parse_args(argc-1, argv+1))
297 exit(EXIT_OPTION_ERROR);
298 devnam_fixed = 1; /* can no longer change device name */
301 * Work out the device name, if it hasn't already been specified,
302 * and parse the tty's options file.
304 if (the_channel->process_extra_options)
305 (*the_channel->process_extra_options)();
308 setlogmask(LOG_UPTO(LOG_DEBUG));
311 * Check that we are running as root.
313 if (geteuid() != 0) {
314 option_error("must be root to run %s, since it is not setuid-root",
319 if (!ppp_available()) {
320 option_error("%s", no_ppp_msg);
321 exit(EXIT_NO_KERNEL_SUPPORT);
325 * Check that the options given are valid and consistent.
328 if (!sys_check_options())
329 exit(EXIT_OPTION_ERROR);
330 auth_check_options();
331 #ifdef HAVE_MULTILINK
334 for (i = 0; (protp = protocols[i]) != NULL; ++i)
335 if (protp->check_options != NULL)
336 (*protp->check_options)();
337 if (the_channel->check_options)
338 (*the_channel->check_options)();
341 if (dump_options || dryrun) {
342 init_pr_log(NULL, LOG_INFO);
343 print_options(pr_log, NULL);
350 * Initialize system-dependent stuff.
354 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
356 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
359 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
361 warn("Warning: disabling multilink");
367 * Detach ourselves from the terminal, if required,
368 * and identify who is running us.
370 if (!nodetach && !updetach)
375 if (pw != NULL && pw->pw_name != NULL)
380 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
381 script_setenv("PPPLOGNAME", p, 0);
384 script_setenv("DEVICE", devnam, 1);
385 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
386 script_setenv("PPPD_PID", numbuf, 1);
392 create_linkpidfile();
395 * If we're doing dial-on-demand, set up the interface now.
399 * Open the loopback channel and set it up to be the ppp interface.
401 tdb_writelock(pppdb);
402 fd_loop = open_ppp_loopback();
404 tdb_writeunlock(pppdb);
407 * Configure the interface and mark it up, etc.
420 doing_callback = do_callback;
423 if (demand && !doing_callback) {
425 * Don't do anything until we see some activity.
427 new_phase(PHASE_DORMANT);
432 if (kill_link && !persist)
434 if (get_loop_output())
438 if (kill_link && !persist)
442 * Now we want to bring up the link.
445 info("Starting link");
448 new_phase(PHASE_SERIALCONN);
450 devfd = the_channel->connect();
454 /* set up the serial device as a ppp interface */
455 tdb_writelock(pppdb);
456 fd_ppp = the_channel->establish_ppp(devfd);
458 tdb_writeunlock(pppdb);
459 status = EXIT_FATAL_ERROR;
463 if (!demand && ifunit >= 0)
465 tdb_writeunlock(pppdb);
468 * Start opening the connection and wait for
469 * incoming events (reply, timeout, etc.).
472 notice("Connect: %s <--> %s", ifname, ppp_devnam);
474 notice("Starting negotiation on %s", ppp_devnam);
475 gettimeofday(&start_time, NULL);
476 link_stats_valid = 0;
477 script_unsetenv("CONNECT_TIME");
478 script_unsetenv("BYTES_SENT");
479 script_unsetenv("BYTES_RCVD");
483 lcp_open(0); /* Start protocol */
484 status = EXIT_NEGOTIATION_FAILED;
485 new_phase(PHASE_ESTABLISH);
486 while (phase != PHASE_DEAD) {
490 lcp_close(0, "User request");
492 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
493 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
494 (*ccp_protent.open)(0);
500 * Print connect time and statistics.
502 if (link_stats_valid) {
503 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
504 info("Connect time %d.%d minutes.", t/10, t%10);
505 info("Sent %u bytes, received %u bytes.",
506 link_stats.bytes_out, link_stats.bytes_in);
510 * Delete pid file before disestablishing ppp. Otherwise it
511 * can happen that another pppd gets the same unit and then
512 * we delete its pid file.
515 if (pidfilename[0] != 0
516 && unlink(pidfilename) < 0 && errno != ENOENT)
517 warn("unable to delete pid file %s: %m", pidfilename);
522 * If we may want to bring the link up again, transfer
523 * the ppp unit back to the loopback. Set the
524 * real serial device back to its normal mode of operation.
528 the_channel->disestablish_ppp(devfd);
533 script_unsetenv("IFNAME");
536 * Run disconnector script, if requested.
537 * XXX we may not be able to do this if the line has hung up!
540 new_phase(PHASE_DISCONNECT);
541 the_channel->disconnect();
544 if (the_channel->cleanup)
545 (*the_channel->cleanup)();
548 if (pidfilename[0] != 0
549 && unlink(pidfilename) < 0 && errno != ENOENT)
550 warn("unable to delete pid file %s: %m", pidfilename);
554 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
559 t = need_holdoff? holdoff: 0;
561 t = (*holdoff_hook)();
563 new_phase(PHASE_HOLDOFF);
564 TIMEOUT(holdoff_end, NULL, t);
568 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
569 } while (phase == PHASE_HOLDOFF);
575 /* Wait for scripts to finish */
576 /* XXX should have a timeout here */
577 while (n_children > 0) {
579 struct subprocess *chp;
580 dbglog("Waiting for %d child processes...", n_children);
581 for (chp = children; chp != NULL; chp = chp->next)
582 dbglog(" script %s, pid %d", chp->prog, chp->pid);
584 if (reap_kids(1) < 0)
593 * handle_events - wait for something to happen and respond to it.
601 kill_link = open_ccp_flag = 0;
602 if (sigsetjmp(sigjmp, 1) == 0) {
603 sigprocmask(SIG_BLOCK, &mask, NULL);
604 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
605 sigprocmask(SIG_UNBLOCK, &mask, NULL);
608 sigprocmask(SIG_UNBLOCK, &mask, NULL);
609 wait_input(timeleft(&timo));
617 if (status != EXIT_HANGUP)
618 status = EXIT_USER_REQUEST;
623 status = EXIT_USER_REQUEST;
627 reap_kids(0); /* Don't leave dead kids lying around */
637 * setup_signals - initialize signal handling.
646 * Compute mask of all interesting signals and install signal handlers
647 * for each. Only one signal handler may be active at a time. Therefore,
648 * all other signals should be masked when any handler is executing.
651 sigaddset(&mask, SIGHUP);
652 sigaddset(&mask, SIGINT);
653 sigaddset(&mask, SIGTERM);
654 sigaddset(&mask, SIGCHLD);
655 sigaddset(&mask, SIGUSR2);
657 #define SIGNAL(s, handler) do { \
658 sa.sa_handler = handler; \
659 if (sigaction(s, &sa, NULL) < 0) \
660 fatal("Couldn't establish signal handler (%d): %m", s); \
665 SIGNAL(SIGHUP, hup); /* Hangup */
666 SIGNAL(SIGINT, term); /* Interrupt */
667 SIGNAL(SIGTERM, term); /* Terminate */
668 SIGNAL(SIGCHLD, chld);
670 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
671 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
674 * Install a handler for other signals which would otherwise
675 * cause pppd to exit without cleaning up.
677 SIGNAL(SIGABRT, bad_signal);
678 SIGNAL(SIGALRM, bad_signal);
679 SIGNAL(SIGFPE, bad_signal);
680 SIGNAL(SIGILL, bad_signal);
681 SIGNAL(SIGPIPE, bad_signal);
682 SIGNAL(SIGQUIT, bad_signal);
683 SIGNAL(SIGSEGV, bad_signal);
685 SIGNAL(SIGBUS, bad_signal);
688 SIGNAL(SIGEMT, bad_signal);
691 SIGNAL(SIGPOLL, bad_signal);
694 SIGNAL(SIGPROF, bad_signal);
697 SIGNAL(SIGSYS, bad_signal);
700 SIGNAL(SIGTRAP, bad_signal);
703 SIGNAL(SIGVTALRM, bad_signal);
706 SIGNAL(SIGXCPU, bad_signal);
709 SIGNAL(SIGXFSZ, bad_signal);
713 * Apparently we can get a SIGPIPE when we call syslog, if
714 * syslogd has died and been restarted. Ignoring it seems
717 signal(SIGPIPE, SIG_IGN);
721 * set_ifunit - do things we need to do once we know which ppp
728 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
729 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
730 script_setenv("IFNAME", ifname, iskey);
732 create_pidfile(); /* write pid to file */
733 create_linkpidfile();
738 * detach - detach us from the controlling terminal.
748 if ((pid = fork()) < 0) {
749 error("Couldn't detach (fork failed: %m)");
750 die(1); /* or just return? */
754 notify(pidchange, pid);
755 exit(0); /* parent dies */
765 /* update pid files if they have been written already */
769 create_linkpidfile();
770 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
771 script_setenv("PPPD_PID", numbuf, 1);
775 * reopen_log - (re)open our connection to syslog.
781 openlog("pppd", LOG_PID);
783 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
784 setlogmask(LOG_UPTO(LOG_INFO));
789 * Create a file containing our process ID.
796 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
797 _PATH_VARRUN, ifname);
798 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
799 fprintf(pidfile, "%d\n", getpid());
800 (void) fclose(pidfile);
802 error("Failed to create pid file %s: %m", pidfilename);
812 if (linkname[0] == 0)
814 script_setenv("LINKNAME", linkname, 1);
815 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
816 _PATH_VARRUN, linkname);
817 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
818 fprintf(pidfile, "%d\n", getpid());
820 fprintf(pidfile, "%s\n", ifname);
821 (void) fclose(pidfile);
823 error("Failed to create pid file %s: %m", linkpidfile);
829 * holdoff_end - called via a timeout when the holdoff period ends.
835 new_phase(PHASE_DORMANT);
838 /* List of protocol names, to make our messages a little more informative. */
839 struct protocol_list {
842 } protocol_list[] = {
844 { 0x23, "OSI Network Layer" },
845 { 0x25, "Xerox NS IDP" },
846 { 0x27, "DECnet Phase IV" },
847 { 0x29, "Appletalk" },
848 { 0x2b, "Novell IPX" },
849 { 0x2d, "VJ compressed TCP/IP" },
850 { 0x2f, "VJ uncompressed TCP/IP" },
851 { 0x31, "Bridging PDU" },
852 { 0x33, "Stream Protocol ST-II" },
853 { 0x35, "Banyan Vines" },
854 { 0x39, "AppleTalk EDDP" },
855 { 0x3b, "AppleTalk SmartBuffered" },
856 { 0x3d, "Multi-Link" },
857 { 0x3f, "NETBIOS Framing" },
858 { 0x41, "Cisco Systems" },
859 { 0x43, "Ascom Timeplex" },
860 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
861 { 0x47, "DCA Remote Lan" },
862 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
863 { 0x4b, "SNA over 802.2" },
865 { 0x4f, "IP6 Header Compression" },
866 { 0x6f, "Stampede Bridging" },
867 { 0xfb, "single-link compression" },
868 { 0xfd, "1st choice compression" },
869 { 0x0201, "802.1d Hello Packets" },
870 { 0x0203, "IBM Source Routing BPDU" },
871 { 0x0205, "DEC LANBridge100 Spanning Tree" },
872 { 0x0231, "Luxcom" },
873 { 0x0233, "Sigma Network Systems" },
874 { 0x8021, "Internet Protocol Control Protocol" },
875 { 0x8023, "OSI Network Layer Control Protocol" },
876 { 0x8025, "Xerox NS IDP Control Protocol" },
877 { 0x8027, "DECnet Phase IV Control Protocol" },
878 { 0x8029, "Appletalk Control Protocol" },
879 { 0x802b, "Novell IPX Control Protocol" },
880 { 0x8031, "Bridging NCP" },
881 { 0x8033, "Stream Protocol Control Protocol" },
882 { 0x8035, "Banyan Vines Control Protocol" },
883 { 0x803d, "Multi-Link Control Protocol" },
884 { 0x803f, "NETBIOS Framing Control Protocol" },
885 { 0x8041, "Cisco Systems Control Protocol" },
886 { 0x8043, "Ascom Timeplex" },
887 { 0x8045, "Fujitsu LBLB Control Protocol" },
888 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
889 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
890 { 0x804b, "SNA over 802.2 Control Protocol" },
891 { 0x804d, "SNA Control Protocol" },
892 { 0x804f, "IP6 Header Compression Control Protocol" },
893 { 0x006f, "Stampede Bridging Control Protocol" },
894 { 0x80fb, "Single Link Compression Control Protocol" },
895 { 0x80fd, "Compression Control Protocol" },
896 { 0xc021, "Link Control Protocol" },
897 { 0xc023, "Password Authentication Protocol" },
898 { 0xc025, "Link Quality Report" },
899 { 0xc027, "Shiva Password Authentication Protocol" },
900 { 0xc029, "CallBack Control Protocol (CBCP)" },
901 { 0xc081, "Container Control Protocol" },
902 { 0xc223, "Challenge Handshake Authentication Protocol" },
903 { 0xc281, "Proprietary Authentication Protocol" },
908 * protocol_name - find a name for a PPP protocol.
914 struct protocol_list *lp;
916 for (lp = protocol_list; lp->proto != 0; ++lp)
917 if (proto == lp->proto)
923 * get_input - called when incoming data is available.
931 struct protent *protp;
933 p = inpacket_buf; /* point to beginning of packet buffer */
935 len = read_packet(inpacket_buf);
940 notice("Modem hangup");
942 status = EXIT_HANGUP;
943 lcp_lowerdown(0); /* serial link is no longer available */
948 if (len < PPP_HDRLEN) {
949 dbglog("received short packet:%.*B", len, p);
953 dump_packet("rcvd", p, len);
955 p += 2; /* Skip address and control */
956 GETSHORT(protocol, p);
960 * Toss all non-LCP packets unless LCP is OPEN.
962 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
963 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
968 * Until we get past the authentication phase, toss all packets
969 * except LCP, LQR and authentication packets.
971 if (phase <= PHASE_AUTHENTICATE
972 && !(protocol == PPP_LCP || protocol == PPP_LQR
973 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
974 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
980 * Upcall the proper protocol input routine.
982 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
983 if (protp->protocol == protocol && protp->enabled_flag) {
984 (*protp->input)(0, p, len);
987 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
988 && protp->datainput != NULL) {
989 (*protp->datainput)(0, p, len);
995 const char *pname = protocol_name(protocol);
997 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
999 warn("Unsupported protocol 0x%x received", protocol);
1001 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1005 * new_phase - signal the start of a new phase of pppd's operation.
1013 (*new_phase_hook)(p);
1014 notify(phasechange, p);
1018 * die - clean up state and exit with the specified status.
1025 notify(exitnotify, status);
1026 syslog(LOG_INFO, "Exit.");
1031 * cleanup - restore anything which needs to be restored before we exit
1040 the_channel->disestablish_ppp(devfd);
1041 if (the_channel->cleanup)
1042 (*the_channel->cleanup)();
1044 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1045 warn("unable to delete pid file %s: %m", pidfilename);
1047 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1048 warn("unable to delete pid file %s: %m", linkpidfile);
1056 * update_link_stats - get stats at link termination.
1059 update_link_stats(u)
1065 if (!get_ppp_stats(u, &link_stats)
1066 || gettimeofday(&now, NULL) < 0)
1068 link_connect_time = now.tv_sec - start_time.tv_sec;
1069 link_stats_valid = 1;
1071 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1072 script_setenv("CONNECT_TIME", numbuf, 0);
1073 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1074 script_setenv("BYTES_SENT", numbuf, 0);
1075 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1076 script_setenv("BYTES_RCVD", numbuf, 0);
1081 struct timeval c_time; /* time at which to call routine */
1082 void *c_arg; /* argument to routine */
1083 void (*c_func) __P((void *)); /* routine */
1084 struct callout *c_next;
1087 static struct callout *callout = NULL; /* Callout list */
1088 static struct timeval timenow; /* Current time */
1091 * timeout - Schedule a timeout.
1094 timeout(func, arg, secs, usecs)
1095 void (*func) __P((void *));
1099 struct callout *newp, *p, **pp;
1101 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1107 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1108 fatal("Out of memory in timeout()!");
1110 newp->c_func = func;
1111 gettimeofday(&timenow, NULL);
1112 newp->c_time.tv_sec = timenow.tv_sec + secs;
1113 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1114 if (newp->c_time.tv_usec >= 1000000) {
1115 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1116 newp->c_time.tv_usec %= 1000000;
1120 * Find correct place and link it in.
1122 for (pp = &callout; (p = *pp); pp = &p->c_next)
1123 if (newp->c_time.tv_sec < p->c_time.tv_sec
1124 || (newp->c_time.tv_sec == p->c_time.tv_sec
1125 && newp->c_time.tv_usec < p->c_time.tv_usec))
1133 * untimeout - Unschedule a timeout.
1136 untimeout(func, arg)
1137 void (*func) __P((void *));
1140 struct callout **copp, *freep;
1142 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1145 * Find first matching timeout and remove it from the list.
1147 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1148 if (freep->c_func == func && freep->c_arg == arg) {
1149 *copp = freep->c_next;
1150 free((char *) freep);
1157 * calltimeout - Call any timeout routines which are now due.
1164 while (callout != NULL) {
1167 if (gettimeofday(&timenow, NULL) < 0)
1168 fatal("Failed to get time of day: %m");
1169 if (!(p->c_time.tv_sec < timenow.tv_sec
1170 || (p->c_time.tv_sec == timenow.tv_sec
1171 && p->c_time.tv_usec <= timenow.tv_usec)))
1172 break; /* no, it's not time yet */
1174 callout = p->c_next;
1175 (*p->c_func)(p->c_arg);
1183 * timeleft - return the length of time until the next timeout is due.
1185 static struct timeval *
1187 struct timeval *tvp;
1189 if (callout == NULL)
1192 gettimeofday(&timenow, NULL);
1193 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1194 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1195 if (tvp->tv_usec < 0) {
1196 tvp->tv_usec += 1000000;
1199 if (tvp->tv_sec < 0)
1200 tvp->tv_sec = tvp->tv_usec = 0;
1207 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1213 struct sigaction act, oldact;
1215 act.sa_handler = SIG_IGN;
1218 sigaction(sig, &act, &oldact);
1219 sigaction(sig, &oldact, NULL);
1224 * hup - Catch SIGHUP signal.
1226 * Indicates that the physical layer has been disconnected.
1227 * We don't rely on this indication; if the user has sent this
1228 * signal, we just take the link down.
1234 info("Hangup (SIGHUP)");
1237 /* Send the signal to the [dis]connector process(es) also */
1239 notify(sigreceived, sig);
1241 siglongjmp(sigjmp, 1);
1246 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1248 * Indicates that we should initiate a graceful disconnect and exit.
1255 info("Terminating on signal %d.", sig);
1258 /* Send the signal to the [dis]connector process(es) also */
1260 notify(sigreceived, sig);
1262 siglongjmp(sigjmp, 1);
1267 * chld - Catch SIGCHLD signal.
1268 * Sets a flag so we will call reap_kids in the mainline.
1276 siglongjmp(sigjmp, 1);
1281 * toggle_debug - Catch SIGUSR1 signal.
1283 * Toggle debug flag.
1292 setlogmask(LOG_UPTO(LOG_DEBUG));
1294 setlogmask(LOG_UPTO(LOG_WARNING));
1300 * open_ccp - Catch SIGUSR2 signal.
1302 * Try to (re)negotiate compression.
1311 siglongjmp(sigjmp, 1);
1316 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1322 static int crashed = 0;
1327 error("Fatal signal %d", sig);
1329 kill_my_pg(SIGTERM);
1330 notify(sigreceived, sig);
1336 * device_script - run a program to talk to the specified fds
1337 * (e.g. to run the connector or disconnector script).
1338 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1341 device_script(program, in, out, dont_wait)
1355 error("Failed to create child process: %m");
1361 record_child(pid, program, NULL, NULL);
1364 while (waitpid(pid, &status, 0) < 0) {
1367 fatal("error waiting for (dis)connection process: %m");
1371 return (status == 0 ? 0 : -1);
1374 /* here we are executing in the child */
1375 /* make sure fds 0, 1, 2 are occupied */
1376 while ((fd = dup(in)) >= 0) {
1383 /* dup in and out to fds > 2 */
1386 if (log_to_fd >= 0) {
1387 errfd = dup(log_to_fd);
1389 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1392 /* close fds 0 - 2 and any others we can think of */
1397 if (the_channel->close)
1398 (*the_channel->close)();
1401 /* dup the in, out, err fds to 0, 1, 2 */
1412 if (getuid() != uid) {
1413 error("setuid failed");
1417 execl("/bin/sh", "sh", "-c", program, (char *)0);
1418 error("could not exec /bin/sh: %m");
1425 * run-program - execute a program with given arguments,
1426 * but don't wait for it.
1427 * If the program can't be executed, logs an error unless
1428 * must_exist is 0 and the program file doesn't exist.
1429 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1430 * or isn't an executable plain file, or the process ID of the child.
1431 * If done != NULL, (*done)(arg) will be called later (within
1432 * reap_kids) iff the return value is > 0.
1435 run_program(prog, args, must_exist, done, arg)
1439 void (*done) __P((void *));
1446 * First check if the file exists and is executable.
1447 * We don't use access() because that would use the
1448 * real user-id, which might not be root, and the script
1449 * might be accessible only to root.
1452 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1453 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1454 if (must_exist || errno != ENOENT)
1455 warn("Can't execute %s: %m", prog);
1461 error("Failed to create child process for %s: %m", prog);
1467 /* Leave the current location */
1468 (void) setsid(); /* No controlling tty. */
1469 (void) umask (S_IRWXG|S_IRWXO);
1470 (void) chdir ("/"); /* no current directory. */
1471 setuid(0); /* set real UID = root */
1474 /* Ensure that nothing of our device environment is inherited. */
1480 if (the_channel->close)
1481 (*the_channel->close)();
1483 /* Don't pass handles to the PPP device, even by accident. */
1484 new_fd = open (_PATH_DEVNULL, O_RDWR);
1487 dup2 (new_fd, 0); /* stdin <- /dev/null */
1490 dup2 (0, 1); /* stdout -> /dev/null */
1491 dup2 (0, 2); /* stderr -> /dev/null */
1495 /* Force the priority back to zero if pppd is running higher. */
1496 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1497 warn("can't reset priority to 0: %m");
1500 /* SysV recommends a second fork at this point. */
1502 /* run the program */
1503 execve(prog, args, script_env);
1504 if (must_exist || errno != ENOENT) {
1505 /* have to reopen the log, there's nowhere else
1506 for the message to go. */
1508 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1515 dbglog("Script %s started (pid %d)", prog, pid);
1516 record_child(pid, prog, done, arg);
1523 * record_child - add a child process to the list for reap_kids
1527 record_child(pid, prog, done, arg)
1530 void (*done) __P((void *));
1533 struct subprocess *chp;
1537 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1539 warn("losing track of %s process", prog);
1545 chp->next = children;
1552 * reap_kids - get status from any dead child processes,
1553 * and log a message for abnormal terminations.
1560 struct subprocess *chp, **prevp;
1562 if (n_children == 0)
1564 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1566 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1567 if (chp->pid == pid) {
1573 if (WIFSIGNALED(status)) {
1574 warn("Child process %s (pid %d) terminated with signal %d",
1575 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1577 dbglog("Script %s finished (pid %d), status = 0x%x",
1578 (chp? chp->prog: "??"), pid, status);
1579 if (chp && chp->done)
1580 (*chp->done)(chp->arg);
1585 if (errno == ECHILD)
1588 error("Error waiting for child process: %m");
1594 * add_notifier - add a new function to be called when something happens.
1597 add_notifier(notif, func, arg)
1598 struct notifier **notif;
1602 struct notifier *np;
1604 np = malloc(sizeof(struct notifier));
1606 novm("notifier struct");
1614 * remove_notifier - remove a function from the list of things to
1615 * be called when something happens.
1618 remove_notifier(notif, func, arg)
1619 struct notifier **notif;
1623 struct notifier *np;
1625 for (; (np = *notif) != 0; notif = &np->next) {
1626 if (np->func == func && np->arg == arg) {
1635 * notify - call a set of functions registered with add_notify.
1639 struct notifier *notif;
1642 struct notifier *np;
1644 while ((np = notif) != 0) {
1646 (*np->func)(np->arg, val);
1651 * novm - log an error message saying we ran out of memory, and die.
1657 fatal("Virtual memory exhausted allocating %s\n", msg);
1661 * script_setenv - set an environment variable value to be used
1662 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1665 script_setenv(var, value, iskey)
1669 size_t varl = strlen(var);
1670 size_t vl = varl + strlen(value) + 2;
1672 char *p, *newstring;
1674 newstring = (char *) malloc(vl+1);
1677 *newstring++ = iskey;
1678 slprintf(newstring, vl, "%s=%s", var, value);
1680 /* check if this variable is already set */
1681 if (script_env != 0) {
1682 for (i = 0; (p = script_env[i]) != 0; ++i) {
1683 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1684 if (p[-1] && pppdb != NULL)
1687 script_env[i] = newstring;
1688 if (iskey && pppdb != NULL)
1689 add_db_key(newstring);
1695 /* no space allocated for script env. ptrs. yet */
1697 script_env = (char **) malloc(16 * sizeof(char *));
1698 if (script_env == 0)
1703 /* reallocate script_env with more space if needed */
1704 if (i + 1 >= s_env_nalloc) {
1706 char **newenv = (char **) realloc((void *)script_env,
1707 new_n * sizeof(char *));
1710 script_env = newenv;
1711 s_env_nalloc = new_n;
1714 script_env[i] = newstring;
1715 script_env[i+1] = 0;
1717 if (pppdb != NULL) {
1719 add_db_key(newstring);
1725 * script_unsetenv - remove a variable from the environment
1729 script_unsetenv(var)
1732 int vl = strlen(var);
1736 if (script_env == 0)
1738 for (i = 0; (p = script_env[i]) != 0; ++i) {
1739 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1740 if (p[-1] && pppdb != NULL)
1743 while ((script_env[i] = script_env[i+1]) != 0)
1753 * update_db_entry - update our entry in the database.
1762 if (script_env == NULL)
1765 for (i = 0; (p = script_env[i]) != 0; ++i)
1766 vlen += strlen(p) + 1;
1767 vbuf = malloc(vlen);
1769 novm("database entry");
1771 for (i = 0; (p = script_env[i]) != 0; ++i)
1772 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1775 key.dsize = strlen(db_key);
1778 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1779 error("tdb_store failed: %s", tdb_error(pppdb));
1784 * add_db_key - add a key that we can use to look up our database entry.
1792 key.dptr = (char *) str;
1793 key.dsize = strlen(str);
1795 dbuf.dsize = strlen(db_key);
1796 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1797 error("tdb_store key failed: %s", tdb_error(pppdb));
1801 * delete_db_key - delete a key for looking up our database entry.
1809 key.dptr = (char *) str;
1810 key.dsize = strlen(str);
1811 tdb_delete(pppdb, key);
1815 * cleanup_db - delete all the entries we put in the database.
1825 key.dsize = strlen(db_key);
1826 tdb_delete(pppdb, key);
1827 for (i = 0; (p = script_env[i]) != 0; ++i)