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 1.102 2001/02/22 03:10:57 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"
57 #include "patchlevel.h"
66 #endif /* IPX_CHANGE */
71 static const char rcsid[] = RCSID;
74 char ifname[32]; /* Interface name */
75 int ifunit; /* Interface unit number */
77 char *progname; /* Name of this program */
78 char hostname[MAXNAMELEN]; /* Our hostname */
79 static char pidfilename[MAXPATHLEN]; /* name of pid file */
80 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
81 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
82 uid_t uid; /* Our real user-id */
83 struct notifier *pidchange = NULL;
84 struct notifier *phasechange = NULL;
85 struct notifier *exitnotify = NULL;
86 struct notifier *sigreceived = NULL;
88 int hungup; /* terminal has been hung up */
89 int privileged; /* we're running as real uid root */
90 int need_holdoff; /* need holdoff period before restarting */
91 int detached; /* have detached from terminal */
92 volatile int status; /* exit status for pppd */
93 int unsuccess; /* # unsuccessful connection attempts */
94 int do_callback; /* != 0 if we should do callback next */
95 int doing_callback; /* != 0 if we are doing callback */
96 TDB_CONTEXT *pppdb; /* database for storing status etc. */
99 int (*holdoff_hook) __P((void)) = NULL;
100 int (*new_phase_hook) __P((int)) = NULL;
102 static int conn_running; /* we have a [dis]connector running */
103 static int devfd; /* fd of underlying device */
104 static int fd_ppp = -1; /* fd for talking PPP */
105 static int fd_loop; /* fd for getting demand-dial packets */
107 int phase; /* where the link is at */
116 static sigjmp_buf sigjmp;
118 char **script_env; /* Env. variable values for scripts */
119 int s_env_nalloc; /* # words avail at script_env */
121 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
122 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
124 static int n_children; /* # child processes still running */
125 static int got_sigchld; /* set if we have received a SIGCHLD */
127 int privopen; /* don't lock, open device as root */
129 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
131 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
132 int ngroups; /* How many groups valid in groups */
134 static struct timeval start_time; /* Time when link was started. */
136 struct pppd_stats link_stats;
137 int link_connect_time;
138 int link_stats_valid;
141 * We maintain a list of child process pids and
142 * functions to call when they exit.
147 void (*done) __P((void *));
149 struct subprocess *next;
152 static struct subprocess *children;
154 /* Prototypes for procedures local to this file. */
156 static void setup_signals __P((void));
157 static void create_pidfile __P((void));
158 static void create_linkpidfile __P((void));
159 static void cleanup __P((void));
160 static void get_input __P((void));
161 static void calltimeout __P((void));
162 static struct timeval *timeleft __P((struct timeval *));
163 static void kill_my_pg __P((int));
164 static void hup __P((int));
165 static void term __P((int));
166 static void chld __P((int));
167 static void toggle_debug __P((int));
168 static void open_ccp __P((int));
169 static void bad_signal __P((int));
170 static void holdoff_end __P((void *));
171 static int reap_kids __P((int waitfor));
172 static void update_db_entry __P((void));
173 static void add_db_key __P((const char *));
174 static void delete_db_key __P((const char *));
175 static void cleanup_db __P((void));
176 static void handle_events __P((void));
178 extern char *ttyname __P((int));
179 extern char *getlogin __P((void));
180 int main __P((int, char *[]));
184 #define O_NONBLOCK O_NDELAY
188 #define setlogmask(x)
192 * PPP Data Link Layer "protocol" table.
193 * One entry per supported protocol.
194 * The last entry must be NULL.
196 struct protent *protocols[] = {
218 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
220 #if !defined(PPP_DRV_NAME)
221 #define PPP_DRV_NAME "ppp"
222 #endif /* !defined(PPP_DRV_NAME) */
232 struct protent *protp;
235 new_phase(PHASE_INITIALIZE);
238 * Ensure that fds 0, 1, 2 are open, to /dev/null if nowhere else.
239 * This way we can close 0, 1, 2 in detach() without clobbering
240 * a fd that we are using.
242 if ((i = open("/dev/null", O_RDWR)) >= 0) {
243 while (0 <= i && i <= 2)
251 /* Initialize syslog facilities */
254 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
255 option_error("Couldn't get hostname: %m");
258 hostname[MAXNAMELEN-1] = 0;
260 /* make sure we don't create world or group writable files. */
261 umask(umask(0777) | 022);
264 privileged = uid == 0;
265 slprintf(numbuf, sizeof(numbuf), "%d", uid);
266 script_setenv("ORIG_UID", numbuf, 0);
268 ngroups = getgroups(NGROUPS_MAX, groups);
271 * Initialize magic number generator now so that protocols may
272 * use magic numbers in initialization.
277 * Initialize each protocol.
279 for (i = 0; (protp = protocols[i]) != NULL; ++i)
286 * Parse, in order, the system options file, the user's options file,
287 * and the command line arguments.
289 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
290 || !options_from_user()
291 || !parse_args(argc-1, argv+1))
292 exit(EXIT_OPTION_ERROR);
293 devnam_fixed = 1; /* can no longer change device name */
296 * Work out the device name, if it hasn't already been specified,
297 * and parse the tty's options file.
302 * Check that we are running as root.
304 if (geteuid() != 0) {
305 option_error("must be root to run %s, since it is not setuid-root",
310 if (!ppp_available()) {
311 option_error("%s", no_ppp_msg);
312 exit(EXIT_NO_KERNEL_SUPPORT);
316 * Check that the options given are valid and consistent.
318 if (!sys_check_options())
319 exit(EXIT_OPTION_ERROR);
320 auth_check_options();
321 #ifdef HAVE_MULTILINK
324 for (i = 0; (protp = protocols[i]) != NULL; ++i)
325 if (protp->check_options != NULL)
326 (*protp->check_options)();
330 * Initialize system-dependent stuff.
334 setlogmask(LOG_UPTO(LOG_DEBUG));
336 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
338 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
341 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
343 warn("Warning: disabling multilink");
349 * Detach ourselves from the terminal, if required,
350 * and identify who is running us.
352 if (!nodetach && !updetach)
357 if (pw != NULL && pw->pw_name != NULL)
362 syslog(LOG_NOTICE, "pppd %s.%d%s started by %s, uid %d",
363 VERSION, PATCHLEVEL, IMPLEMENTATION, p, uid);
364 script_setenv("PPPLOGNAME", p, 0);
367 script_setenv("DEVICE", devnam, 1);
368 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
369 script_setenv("PPPD_PID", numbuf, 1);
375 create_linkpidfile();
378 * If we're doing dial-on-demand, set up the interface now.
382 * Open the loopback channel and set it up to be the ppp interface.
384 tdb_writelock(pppdb);
385 fd_loop = open_ppp_loopback();
387 tdb_writeunlock(pppdb);
390 * Configure the interface and mark it up, etc.
403 doing_callback = do_callback;
406 if (demand && !doing_callback) {
408 * Don't do anything until we see some activity.
410 new_phase(PHASE_DORMANT);
415 if (kill_link && !persist)
417 if (get_loop_output())
421 if (kill_link && !persist)
425 * Now we want to bring up the link.
428 info("Starting link");
431 new_phase(PHASE_SERIALCONN);
433 devfd = connect_tty();
437 /* set up the serial device as a ppp interface */
438 tdb_writelock(pppdb);
439 fd_ppp = establish_ppp(devfd);
441 tdb_writeunlock(pppdb);
442 status = EXIT_FATAL_ERROR;
446 if (!demand && ifunit >= 0)
448 tdb_writeunlock(pppdb);
451 * Start opening the connection and wait for
452 * incoming events (reply, timeout, etc.).
454 notice("Connect: %s <--> %s", ifname, ppp_devnam);
455 gettimeofday(&start_time, NULL);
456 link_stats_valid = 0;
457 script_unsetenv("CONNECT_TIME");
458 script_unsetenv("BYTES_SENT");
459 script_unsetenv("BYTES_RCVD");
463 lcp_open(0); /* Start protocol */
464 status = EXIT_NEGOTIATION_FAILED;
465 new_phase(PHASE_ESTABLISH);
466 while (phase != PHASE_DEAD) {
470 lcp_close(0, "User request");
472 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
473 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
474 (*ccp_protent.open)(0);
480 * Print connect time and statistics.
482 if (link_stats_valid) {
483 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
484 info("Connect time %d.%d minutes.", t/10, t%10);
485 info("Sent %d bytes, received %d bytes.",
486 link_stats.bytes_out, link_stats.bytes_in);
490 * Delete pid file before disestablishing ppp. Otherwise it
491 * can happen that another pppd gets the same unit and then
492 * we delete its pid file.
495 if (pidfilename[0] != 0
496 && unlink(pidfilename) < 0 && errno != ENOENT)
497 warn("unable to delete pid file %s: %m", pidfilename);
502 * If we may want to bring the link up again, transfer
503 * the ppp unit back to the loopback. Set the
504 * real serial device back to its normal mode of operation.
510 disestablish_ppp(devfd);
515 script_unsetenv("IFNAME");
518 * Run disconnector script, if requested.
519 * XXX we may not be able to do this if the line has hung up!
522 new_phase(PHASE_DISCONNECT);
529 if (pidfilename[0] != 0
530 && unlink(pidfilename) < 0 && errno != ENOENT)
531 warn("unable to delete pid file %s: %m", pidfilename);
535 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
540 t = need_holdoff? holdoff: 0;
542 t = (*holdoff_hook)();
544 new_phase(PHASE_HOLDOFF);
545 TIMEOUT(holdoff_end, NULL, t);
549 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
550 } while (phase == PHASE_HOLDOFF);
556 /* Wait for scripts to finish */
557 /* XXX should have a timeout here */
558 while (n_children > 0) {
560 struct subprocess *chp;
561 dbglog("Waiting for %d child processes...", n_children);
562 for (chp = children; chp != NULL; chp = chp->next)
563 dbglog(" script %s, pid %d", chp->prog, chp->pid);
565 if (reap_kids(1) < 0)
574 * handle_events - wait for something to happen and respond to it.
582 kill_link = open_ccp_flag = 0;
583 if (sigsetjmp(sigjmp, 1) == 0) {
584 sigprocmask(SIG_BLOCK, &mask, NULL);
585 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
586 sigprocmask(SIG_UNBLOCK, &mask, NULL);
589 sigprocmask(SIG_UNBLOCK, &mask, NULL);
590 wait_input(timeleft(&timo));
598 if (status != EXIT_HANGUP)
599 status = EXIT_USER_REQUEST;
604 status = EXIT_USER_REQUEST;
608 reap_kids(0); /* Don't leave dead kids lying around */
618 * setup_signals - initialize signal handling.
627 * Compute mask of all interesting signals and install signal handlers
628 * for each. Only one signal handler may be active at a time. Therefore,
629 * all other signals should be masked when any handler is executing.
632 sigaddset(&mask, SIGHUP);
633 sigaddset(&mask, SIGINT);
634 sigaddset(&mask, SIGTERM);
635 sigaddset(&mask, SIGCHLD);
636 sigaddset(&mask, SIGUSR2);
638 #define SIGNAL(s, handler) do { \
639 sa.sa_handler = handler; \
640 if (sigaction(s, &sa, NULL) < 0) \
641 fatal("Couldn't establish signal handler (%d): %m", s); \
646 SIGNAL(SIGHUP, hup); /* Hangup */
647 SIGNAL(SIGINT, term); /* Interrupt */
648 SIGNAL(SIGTERM, term); /* Terminate */
649 SIGNAL(SIGCHLD, chld);
651 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
652 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
655 * Install a handler for other signals which would otherwise
656 * cause pppd to exit without cleaning up.
658 SIGNAL(SIGABRT, bad_signal);
659 SIGNAL(SIGALRM, bad_signal);
660 SIGNAL(SIGFPE, bad_signal);
661 SIGNAL(SIGILL, bad_signal);
662 SIGNAL(SIGPIPE, bad_signal);
663 SIGNAL(SIGQUIT, bad_signal);
664 SIGNAL(SIGSEGV, bad_signal);
666 SIGNAL(SIGBUS, bad_signal);
669 SIGNAL(SIGEMT, bad_signal);
672 SIGNAL(SIGPOLL, bad_signal);
675 SIGNAL(SIGPROF, bad_signal);
678 SIGNAL(SIGSYS, bad_signal);
681 SIGNAL(SIGTRAP, bad_signal);
684 SIGNAL(SIGVTALRM, bad_signal);
687 SIGNAL(SIGXCPU, bad_signal);
690 SIGNAL(SIGXFSZ, bad_signal);
694 * Apparently we can get a SIGPIPE when we call syslog, if
695 * syslogd has died and been restarted. Ignoring it seems
698 signal(SIGPIPE, SIG_IGN);
702 * set_ifunit - do things we need to do once we know which ppp
709 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
710 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
711 script_setenv("IFNAME", ifname, iskey);
713 create_pidfile(); /* write pid to file */
714 create_linkpidfile();
719 * detach - detach us from the controlling terminal.
729 if ((pid = fork()) < 0) {
730 error("Couldn't detach (fork failed: %m)");
731 die(1); /* or just return? */
735 notify(pidchange, pid);
736 exit(0); /* parent dies */
744 if (!log_to_file && !log_to_specific_fd)
746 /* update pid files if they have been written already */
750 create_linkpidfile();
751 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
752 script_setenv("PPPD_PID", numbuf, 1);
756 * reopen_log - (re)open our connection to syslog.
762 openlog("pppd", LOG_PID);
764 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
765 setlogmask(LOG_UPTO(LOG_INFO));
770 * Create a file containing our process ID.
777 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
778 _PATH_VARRUN, ifname);
779 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
780 fprintf(pidfile, "%d\n", getpid());
781 (void) fclose(pidfile);
783 error("Failed to create pid file %s: %m", pidfilename);
793 if (linkname[0] == 0)
795 script_setenv("LINKNAME", linkname, 1);
796 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
797 _PATH_VARRUN, linkname);
798 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
799 fprintf(pidfile, "%d\n", getpid());
801 fprintf(pidfile, "%s\n", ifname);
802 (void) fclose(pidfile);
804 error("Failed to create pid file %s: %m", linkpidfile);
810 * holdoff_end - called via a timeout when the holdoff period ends.
816 new_phase(PHASE_DORMANT);
819 /* List of protocol names, to make our messages a little more informative. */
820 struct protocol_list {
823 } protocol_list[] = {
825 { 0x23, "OSI Network Layer" },
826 { 0x25, "Xerox NS IDP" },
827 { 0x27, "DECnet Phase IV" },
828 { 0x29, "Appletalk" },
829 { 0x2b, "Novell IPX" },
830 { 0x2d, "VJ compressed TCP/IP" },
831 { 0x2f, "VJ uncompressed TCP/IP" },
832 { 0x31, "Bridging PDU" },
833 { 0x33, "Stream Protocol ST-II" },
834 { 0x35, "Banyan Vines" },
835 { 0x39, "AppleTalk EDDP" },
836 { 0x3b, "AppleTalk SmartBuffered" },
837 { 0x3d, "Multi-Link" },
838 { 0x3f, "NETBIOS Framing" },
839 { 0x41, "Cisco Systems" },
840 { 0x43, "Ascom Timeplex" },
841 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
842 { 0x47, "DCA Remote Lan" },
843 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
844 { 0x4b, "SNA over 802.2" },
846 { 0x4f, "IP6 Header Compression" },
847 { 0x6f, "Stampede Bridging" },
848 { 0xfb, "single-link compression" },
849 { 0xfd, "1st choice compression" },
850 { 0x0201, "802.1d Hello Packets" },
851 { 0x0203, "IBM Source Routing BPDU" },
852 { 0x0205, "DEC LANBridge100 Spanning Tree" },
853 { 0x0231, "Luxcom" },
854 { 0x0233, "Sigma Network Systems" },
855 { 0x8021, "Internet Protocol Control Protocol" },
856 { 0x8023, "OSI Network Layer Control Protocol" },
857 { 0x8025, "Xerox NS IDP Control Protocol" },
858 { 0x8027, "DECnet Phase IV Control Protocol" },
859 { 0x8029, "Appletalk Control Protocol" },
860 { 0x802b, "Novell IPX Control Protocol" },
861 { 0x8031, "Bridging NCP" },
862 { 0x8033, "Stream Protocol Control Protocol" },
863 { 0x8035, "Banyan Vines Control Protocol" },
864 { 0x803d, "Multi-Link Control Protocol" },
865 { 0x803f, "NETBIOS Framing Control Protocol" },
866 { 0x8041, "Cisco Systems Control Protocol" },
867 { 0x8043, "Ascom Timeplex" },
868 { 0x8045, "Fujitsu LBLB Control Protocol" },
869 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
870 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
871 { 0x804b, "SNA over 802.2 Control Protocol" },
872 { 0x804d, "SNA Control Protocol" },
873 { 0x804f, "IP6 Header Compression Control Protocol" },
874 { 0x006f, "Stampede Bridging Control Protocol" },
875 { 0x80fb, "Single Link Compression Control Protocol" },
876 { 0x80fd, "Compression Control Protocol" },
877 { 0xc021, "Link Control Protocol" },
878 { 0xc023, "Password Authentication Protocol" },
879 { 0xc025, "Link Quality Report" },
880 { 0xc027, "Shiva Password Authentication Protocol" },
881 { 0xc029, "CallBack Control Protocol (CBCP)" },
882 { 0xc081, "Container Control Protocol" },
883 { 0xc223, "Challenge Handshake Authentication Protocol" },
884 { 0xc281, "Proprietary Authentication Protocol" },
889 * protocol_name - find a name for a PPP protocol.
895 struct protocol_list *lp;
897 for (lp = protocol_list; lp->proto != 0; ++lp)
898 if (proto == lp->proto)
904 * get_input - called when incoming data is available.
912 struct protent *protp;
914 p = inpacket_buf; /* point to beginning of packet buffer */
916 len = read_packet(inpacket_buf);
921 notice("Modem hangup");
923 status = EXIT_HANGUP;
924 lcp_lowerdown(0); /* serial link is no longer available */
929 if (debug /*&& (debugflags & DBG_INPACKET)*/)
930 dbglog("rcvd %P", p, len);
932 if (len < PPP_HDRLEN) {
933 MAINDEBUG(("io(): Received short packet."));
937 p += 2; /* Skip address and control */
938 GETSHORT(protocol, p);
942 * Toss all non-LCP packets unless LCP is OPEN.
944 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
945 MAINDEBUG(("get_input: Received non-LCP packet when LCP not open."));
950 * Until we get past the authentication phase, toss all packets
951 * except LCP, LQR and authentication packets.
953 if (phase <= PHASE_AUTHENTICATE
954 && !(protocol == PPP_LCP || protocol == PPP_LQR
955 || protocol == PPP_PAP || protocol == PPP_CHAP)) {
956 MAINDEBUG(("get_input: discarding proto 0x%x in phase %d",
962 * Upcall the proper protocol input routine.
964 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
965 if (protp->protocol == protocol && protp->enabled_flag) {
966 (*protp->input)(0, p, len);
969 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
970 && protp->datainput != NULL) {
971 (*protp->datainput)(0, p, len);
977 const char *pname = protocol_name(protocol);
979 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
981 warn("Unsupported protocol 0x%x received", protocol);
983 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
987 * new_phase - signal the start of a new phase of pppd's operation.
995 (*new_phase_hook)(p);
996 notify(phasechange, p);
1000 * die - clean up state and exit with the specified status.
1007 notify(exitnotify, status);
1008 syslog(LOG_INFO, "Exit.");
1013 * cleanup - restore anything which needs to be restored before we exit
1022 disestablish_ppp(devfd);
1025 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
1026 warn("unable to delete pid file %s: %m", pidfilename);
1028 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
1029 warn("unable to delete pid file %s: %m", linkpidfile);
1037 * update_link_stats - get stats at link termination.
1040 update_link_stats(u)
1046 if (!get_ppp_stats(u, &link_stats)
1047 || gettimeofday(&now, NULL) < 0)
1049 link_connect_time = now.tv_sec - start_time.tv_sec;
1050 link_stats_valid = 1;
1052 slprintf(numbuf, sizeof(numbuf), "%d", link_connect_time);
1053 script_setenv("CONNECT_TIME", numbuf, 0);
1054 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_out);
1055 script_setenv("BYTES_SENT", numbuf, 0);
1056 slprintf(numbuf, sizeof(numbuf), "%d", link_stats.bytes_in);
1057 script_setenv("BYTES_RCVD", numbuf, 0);
1062 struct timeval c_time; /* time at which to call routine */
1063 void *c_arg; /* argument to routine */
1064 void (*c_func) __P((void *)); /* routine */
1065 struct callout *c_next;
1068 static struct callout *callout = NULL; /* Callout list */
1069 static struct timeval timenow; /* Current time */
1072 * timeout - Schedule a timeout.
1074 * Note that this timeout takes the number of milliseconds, NOT hz (as in
1078 timeout(func, arg, secs, usecs)
1079 void (*func) __P((void *));
1083 struct callout *newp, *p, **pp;
1085 MAINDEBUG(("Timeout %p:%p in %d.%03d seconds.", func, arg,
1086 time / 1000, time % 1000));
1091 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1092 fatal("Out of memory in timeout()!");
1094 newp->c_func = func;
1095 gettimeofday(&timenow, NULL);
1096 newp->c_time.tv_sec = timenow.tv_sec + secs;
1097 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1098 if (newp->c_time.tv_usec >= 1000000) {
1099 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1100 newp->c_time.tv_usec %= 1000000;
1104 * Find correct place and link it in.
1106 for (pp = &callout; (p = *pp); pp = &p->c_next)
1107 if (newp->c_time.tv_sec < p->c_time.tv_sec
1108 || (newp->c_time.tv_sec == p->c_time.tv_sec
1109 && newp->c_time.tv_usec < p->c_time.tv_usec))
1117 * untimeout - Unschedule a timeout.
1120 untimeout(func, arg)
1121 void (*func) __P((void *));
1124 struct callout **copp, *freep;
1126 MAINDEBUG(("Untimeout %p:%p.", func, arg));
1129 * Find first matching timeout and remove it from the list.
1131 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1132 if (freep->c_func == func && freep->c_arg == arg) {
1133 *copp = freep->c_next;
1134 free((char *) freep);
1141 * calltimeout - Call any timeout routines which are now due.
1148 while (callout != NULL) {
1151 if (gettimeofday(&timenow, NULL) < 0)
1152 fatal("Failed to get time of day: %m");
1153 if (!(p->c_time.tv_sec < timenow.tv_sec
1154 || (p->c_time.tv_sec == timenow.tv_sec
1155 && p->c_time.tv_usec <= timenow.tv_usec)))
1156 break; /* no, it's not time yet */
1158 callout = p->c_next;
1159 (*p->c_func)(p->c_arg);
1167 * timeleft - return the length of time until the next timeout is due.
1169 static struct timeval *
1171 struct timeval *tvp;
1173 if (callout == NULL)
1176 gettimeofday(&timenow, NULL);
1177 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1178 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1179 if (tvp->tv_usec < 0) {
1180 tvp->tv_usec += 1000000;
1183 if (tvp->tv_sec < 0)
1184 tvp->tv_sec = tvp->tv_usec = 0;
1191 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1197 struct sigaction act, oldact;
1199 act.sa_handler = SIG_IGN;
1202 sigaction(sig, &act, &oldact);
1203 sigaction(sig, &oldact, NULL);
1208 * hup - Catch SIGHUP signal.
1210 * Indicates that the physical layer has been disconnected.
1211 * We don't rely on this indication; if the user has sent this
1212 * signal, we just take the link down.
1218 info("Hangup (SIGHUP)");
1221 /* Send the signal to the [dis]connector process(es) also */
1223 notify(sigreceived, sig);
1225 siglongjmp(sigjmp, 1);
1230 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1232 * Indicates that we should initiate a graceful disconnect and exit.
1239 info("Terminating on signal %d.", sig);
1242 /* Send the signal to the [dis]connector process(es) also */
1244 notify(sigreceived, sig);
1246 siglongjmp(sigjmp, 1);
1251 * chld - Catch SIGCHLD signal.
1252 * Sets a flag so we will call reap_kids in the mainline.
1260 siglongjmp(sigjmp, 1);
1265 * toggle_debug - Catch SIGUSR1 signal.
1267 * Toggle debug flag.
1276 setlogmask(LOG_UPTO(LOG_DEBUG));
1278 setlogmask(LOG_UPTO(LOG_WARNING));
1284 * open_ccp - Catch SIGUSR2 signal.
1286 * Try to (re)negotiate compression.
1295 siglongjmp(sigjmp, 1);
1300 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1306 static int crashed = 0;
1311 error("Fatal signal %d", sig);
1313 kill_my_pg(SIGTERM);
1314 notify(sigreceived, sig);
1320 * device_script - run a program to talk to the specified fds
1321 * (e.g. to run the connector or disconnector script).
1322 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1325 device_script(program, in, out, dont_wait)
1339 error("Failed to create child process: %m");
1345 record_child(pid, program, NULL, NULL);
1348 while (waitpid(pid, &status, 0) < 0) {
1351 fatal("error waiting for (dis)connection process: %m");
1355 return (status == 0 ? 0 : -1);
1358 /* here we are executing in the child */
1359 /* make sure fds 0, 1, 2 are occupied */
1360 while ((fd = dup(in)) >= 0) {
1367 /* dup in and out to fds > 2 */
1370 if (log_to_fd >= 0) {
1371 errfd = dup(log_to_fd);
1373 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1376 /* close fds 0 - 2 and any others we can think of */
1384 /* dup the in, out, err fds to 0, 1, 2 */
1395 if (getuid() != uid) {
1396 error("setuid failed");
1400 execl("/bin/sh", "sh", "-c", program, (char *)0);
1401 error("could not exec /bin/sh: %m");
1408 * run-program - execute a program with given arguments,
1409 * but don't wait for it.
1410 * If the program can't be executed, logs an error unless
1411 * must_exist is 0 and the program file doesn't exist.
1412 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1413 * or isn't an executable plain file, or the process ID of the child.
1414 * If done != NULL, (*done)(arg) will be called later (within
1415 * reap_kids) iff the return value is > 0.
1418 run_program(prog, args, must_exist, done, arg)
1422 void (*done) __P((void *));
1429 * First check if the file exists and is executable.
1430 * We don't use access() because that would use the
1431 * real user-id, which might not be root, and the script
1432 * might be accessible only to root.
1435 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1436 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1437 if (must_exist || errno != ENOENT)
1438 warn("Can't execute %s: %m", prog);
1444 error("Failed to create child process for %s: %m", prog);
1450 /* Leave the current location */
1451 (void) setsid(); /* No controlling tty. */
1452 (void) umask (S_IRWXG|S_IRWXO);
1453 (void) chdir ("/"); /* no current directory. */
1454 setuid(0); /* set real UID = root */
1457 /* Ensure that nothing of our device environment is inherited. */
1465 /* Don't pass handles to the PPP device, even by accident. */
1466 new_fd = open (_PATH_DEVNULL, O_RDWR);
1469 dup2 (new_fd, 0); /* stdin <- /dev/null */
1472 dup2 (0, 1); /* stdout -> /dev/null */
1473 dup2 (0, 2); /* stderr -> /dev/null */
1477 /* Force the priority back to zero if pppd is running higher. */
1478 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1479 warn("can't reset priority to 0: %m");
1482 /* SysV recommends a second fork at this point. */
1484 /* run the program */
1485 execve(prog, args, script_env);
1486 if (must_exist || errno != ENOENT) {
1487 /* have to reopen the log, there's nowhere else
1488 for the message to go. */
1490 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1497 dbglog("Script %s started (pid %d)", prog, pid);
1498 record_child(pid, prog, done, arg);
1505 * record_child - add a child process to the list for reap_kids
1509 record_child(pid, prog, done, arg)
1512 void (*done) __P((void *));
1515 struct subprocess *chp;
1519 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1521 warn("losing track of %s process", prog);
1527 chp->next = children;
1534 * reap_kids - get status from any dead child processes,
1535 * and log a message for abnormal terminations.
1542 struct subprocess *chp, **prevp;
1544 if (n_children == 0)
1546 while ((pid = waitpid(-1, &status, (waitfor? 0: WNOHANG))) != -1
1548 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1549 if (chp->pid == pid) {
1555 if (WIFSIGNALED(status)) {
1556 warn("Child process %s (pid %d) terminated with signal %d",
1557 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1559 dbglog("Script %s finished (pid %d), status = 0x%x",
1560 (chp? chp->prog: "??"), pid, status);
1561 if (chp && chp->done)
1562 (*chp->done)(chp->arg);
1567 if (errno == ECHILD)
1570 error("Error waiting for child process: %m");
1576 * add_notifier - add a new function to be called when something happens.
1579 add_notifier(notif, func, arg)
1580 struct notifier **notif;
1584 struct notifier *np;
1586 np = malloc(sizeof(struct notifier));
1588 novm("notifier struct");
1596 * remove_notifier - remove a function from the list of things to
1597 * be called when something happens.
1600 remove_notifier(notif, func, arg)
1601 struct notifier **notif;
1605 struct notifier *np;
1607 for (; (np = *notif) != 0; notif = &np->next) {
1608 if (np->func == func && np->arg == arg) {
1617 * notify - call a set of functions registered with add_notify.
1621 struct notifier *notif;
1624 struct notifier *np;
1626 while ((np = notif) != 0) {
1628 (*np->func)(np->arg, val);
1633 * novm - log an error message saying we ran out of memory, and die.
1639 fatal("Virtual memory exhausted allocating %s\n", msg);
1643 * script_setenv - set an environment variable value to be used
1644 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1647 script_setenv(var, value, iskey)
1651 size_t varl = strlen(var);
1652 size_t vl = varl + strlen(value) + 2;
1654 char *p, *newstring;
1656 newstring = (char *) malloc(vl+1);
1659 *newstring++ = iskey;
1660 slprintf(newstring, vl, "%s=%s", var, value);
1662 /* check if this variable is already set */
1663 if (script_env != 0) {
1664 for (i = 0; (p = script_env[i]) != 0; ++i) {
1665 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1666 if (p[-1] && pppdb != NULL)
1669 script_env[i] = newstring;
1670 if (iskey && pppdb != NULL)
1671 add_db_key(newstring);
1677 /* no space allocated for script env. ptrs. yet */
1679 script_env = (char **) malloc(16 * sizeof(char *));
1680 if (script_env == 0)
1685 /* reallocate script_env with more space if needed */
1686 if (i + 1 >= s_env_nalloc) {
1688 char **newenv = (char **) realloc((void *)script_env,
1689 new_n * sizeof(char *));
1692 script_env = newenv;
1693 s_env_nalloc = new_n;
1696 script_env[i] = newstring;
1697 script_env[i+1] = 0;
1699 if (pppdb != NULL) {
1701 add_db_key(newstring);
1707 * script_unsetenv - remove a variable from the environment
1711 script_unsetenv(var)
1714 int vl = strlen(var);
1718 if (script_env == 0)
1720 for (i = 0; (p = script_env[i]) != 0; ++i) {
1721 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1722 if (p[-1] && pppdb != NULL)
1725 while ((script_env[i] = script_env[i+1]) != 0)
1735 * update_db_entry - update our entry in the database.
1744 if (script_env == NULL)
1747 for (i = 0; (p = script_env[i]) != 0; ++i)
1748 vlen += strlen(p) + 1;
1749 vbuf = malloc(vlen);
1751 novm("database entry");
1753 for (i = 0; (p = script_env[i]) != 0; ++i)
1754 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1757 key.dsize = strlen(db_key);
1760 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1761 error("tdb_store failed: %s", tdb_error(pppdb));
1766 * add_db_key - add a key that we can use to look up our database entry.
1774 key.dptr = (char *) str;
1775 key.dsize = strlen(str);
1777 dbuf.dsize = strlen(db_key);
1778 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1779 error("tdb_store key failed: %s", tdb_error(pppdb));
1783 * delete_db_key - delete a key for looking up our database entry.
1791 key.dptr = (char *) str;
1792 key.dsize = strlen(str);
1793 tdb_delete(pppdb, key);
1797 * cleanup_db - delete all the entries we put in the database.
1807 key.dsize = strlen(db_key);
1808 tdb_delete(pppdb, key);
1809 for (i = 0; (p = script_env[i]) != 0; ++i)