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
27 * tech-transfer@andrew.cmu.edu
29 * 4. Redistributions of any form whatsoever must retain the following
31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
34 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
35 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
36 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
37 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
38 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
39 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
40 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
42 * Copyright (c) 1999-2004 Paul Mackerras. All rights reserved.
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
51 * 2. The name(s) of the authors of this software must not be used to
52 * endorse or promote products derived from this software without
53 * prior written permission.
55 * 3. Redistributions of any form whatsoever must retain the following
57 * "This product includes software developed by Paul Mackerras
58 * <paulus@samba.org>".
60 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
61 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
62 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
63 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
64 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
65 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
66 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
69 #define RCSID "$Id: main.c,v 1.146 2004/11/12 11:21:41 paulus Exp $"
84 #include <sys/param.h>
85 #include <sys/types.h>
88 #include <sys/resource.h>
90 #include <sys/socket.h>
91 #include <netinet/in.h>
92 #include <arpa/inet.h>
103 #include "chap-new.h"
107 #include "pathnames.h"
119 #endif /* IPX_CHANGE */
124 static const char rcsid[] = RCSID;
127 char ifname[32]; /* Interface name */
128 int ifunit; /* Interface unit number */
130 struct channel *the_channel;
132 char *progname; /* Name of this program */
133 char hostname[MAXNAMELEN]; /* Our hostname */
134 static char pidfilename[MAXPATHLEN]; /* name of pid file */
135 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
136 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
137 uid_t uid; /* Our real user-id */
138 struct notifier *pidchange = NULL;
139 struct notifier *phasechange = NULL;
140 struct notifier *exitnotify = NULL;
141 struct notifier *sigreceived = NULL;
142 struct notifier *fork_notifier = NULL;
144 int hungup; /* terminal has been hung up */
145 int privileged; /* we're running as real uid root */
146 int need_holdoff; /* need holdoff period before restarting */
147 int detached; /* have detached from terminal */
148 volatile int status; /* exit status for pppd */
149 int unsuccess; /* # unsuccessful connection attempts */
150 int do_callback; /* != 0 if we should do callback next */
151 int doing_callback; /* != 0 if we are doing callback */
152 int ppp_session_number; /* Session number, for channels with such a
153 concept (eg PPPoE) */
154 int childwait_done; /* have timed out waiting for children */
157 TDB_CONTEXT *pppdb; /* database for storing status etc. */
162 int (*holdoff_hook) __P((void)) = NULL;
163 int (*new_phase_hook) __P((int)) = NULL;
164 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
165 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
167 static int conn_running; /* we have a [dis]connector running */
168 static int fd_loop; /* fd for getting demand-dial packets */
170 int fd_devnull; /* fd for /dev/null */
171 int devfd = -1; /* fd of underlying device */
172 int fd_ppp = -1; /* fd for talking PPP */
173 int phase; /* where the link is at */
181 static sigset_t signals_handled;
183 static sigjmp_buf sigjmp;
185 char **script_env; /* Env. variable values for scripts */
186 int s_env_nalloc; /* # words avail at script_env */
188 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
189 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
191 static int n_children; /* # child processes still running */
192 static int got_sigchld; /* set if we have received a SIGCHLD */
194 int privopen; /* don't lock, open device as root */
196 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
198 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
199 int ngroups; /* How many groups valid in groups */
201 static struct timeval start_time; /* Time when link was started. */
203 static struct pppd_stats old_link_stats;
204 struct pppd_stats link_stats;
205 unsigned link_connect_time;
206 int link_stats_valid;
211 bool bundle_terminating;
214 * We maintain a list of child process pids and
215 * functions to call when they exit.
220 void (*done) __P((void *));
222 struct subprocess *next;
225 static struct subprocess *children;
227 /* Prototypes for procedures local to this file. */
229 static void setup_signals __P((void));
230 static void create_pidfile __P((int pid));
231 static void create_linkpidfile __P((int pid));
232 static void cleanup __P((void));
233 static void get_input __P((void));
234 static void calltimeout __P((void));
235 static struct timeval *timeleft __P((struct timeval *));
236 static void kill_my_pg __P((int));
237 static void hup __P((int));
238 static void term __P((int));
239 static void chld __P((int));
240 static void toggle_debug __P((int));
241 static void open_ccp __P((int));
242 static void bad_signal __P((int));
243 static void holdoff_end __P((void *));
244 static int reap_kids __P((void));
245 static void childwait_end __P((void *));
248 static void update_db_entry __P((void));
249 static void add_db_key __P((const char *));
250 static void delete_db_key __P((const char *));
251 static void cleanup_db __P((void));
254 static void handle_events __P((void));
255 void print_link_stats __P((void));
257 extern char *ttyname __P((int));
258 extern char *getlogin __P((void));
259 int main __P((int, char *[]));
263 #define O_NONBLOCK O_NDELAY
267 #define setlogmask(x)
271 * PPP Data Link Layer "protocol" table.
272 * One entry per supported protocol.
273 * The last entry must be NULL.
275 struct protent *protocols[] = {
299 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
301 #if !defined(PPP_DRV_NAME)
302 #define PPP_DRV_NAME "ppp"
303 #endif /* !defined(PPP_DRV_NAME) */
313 struct protent *protp;
316 link_stats_valid = 0;
317 new_phase(PHASE_INITIALIZE);
321 /* Initialize syslog facilities */
324 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
325 option_error("Couldn't get hostname: %m");
328 hostname[MAXNAMELEN-1] = 0;
330 /* make sure we don't create world or group writable files. */
331 umask(umask(0777) | 022);
334 privileged = uid == 0;
335 slprintf(numbuf, sizeof(numbuf), "%d", uid);
336 script_setenv("ORIG_UID", numbuf, 0);
338 ngroups = getgroups(NGROUPS_MAX, groups);
341 * Initialize magic number generator now so that protocols may
342 * use magic numbers in initialization.
347 * Initialize each protocol.
349 for (i = 0; (protp = protocols[i]) != NULL; ++i)
353 * Initialize the default channel.
360 * Parse, in order, the system options file, the user's options file,
361 * and the command line arguments.
363 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
364 || !options_from_user()
365 || !parse_args(argc-1, argv+1))
366 exit(EXIT_OPTION_ERROR);
367 devnam_fixed = 1; /* can no longer change device name */
370 * Work out the device name, if it hasn't already been specified,
371 * and parse the tty's options file.
373 if (the_channel->process_extra_options)
374 (*the_channel->process_extra_options)();
377 setlogmask(LOG_UPTO(LOG_DEBUG));
380 * Check that we are running as root.
382 if (geteuid() != 0) {
383 option_error("must be root to run %s, since it is not setuid-root",
388 if (!ppp_available()) {
389 option_error("%s", no_ppp_msg);
390 exit(EXIT_NO_KERNEL_SUPPORT);
394 * Check that the options given are valid and consistent.
397 if (!sys_check_options())
398 exit(EXIT_OPTION_ERROR);
399 auth_check_options();
400 #ifdef HAVE_MULTILINK
403 for (i = 0; (protp = protocols[i]) != NULL; ++i)
404 if (protp->check_options != NULL)
405 (*protp->check_options)();
406 if (the_channel->check_options)
407 (*the_channel->check_options)();
410 if (dump_options || dryrun) {
411 init_pr_log(NULL, LOG_INFO);
412 print_options(pr_log, NULL);
419 /* Make sure fds 0, 1, 2 are open to somewhere. */
420 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
422 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
423 while (fd_devnull <= 2) {
426 fatal("Critical shortage of file descriptors: dup failed: %m");
431 * Initialize system-dependent stuff.
436 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
438 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
441 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
443 warn("Warning: disabling multilink");
450 * Detach ourselves from the terminal, if required,
451 * and identify who is running us.
453 if (!nodetach && !updetach)
458 if (pw != NULL && pw->pw_name != NULL)
463 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
464 script_setenv("PPPLOGNAME", p, 0);
467 script_setenv("DEVICE", devnam, 1);
468 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
469 script_setenv("PPPD_PID", numbuf, 1);
473 create_linkpidfile(getpid());
478 * If we're doing dial-on-demand, set up the interface now.
482 * Open the loopback channel and set it up to be the ppp interface.
485 tdb_writelock(pppdb);
487 fd_loop = open_ppp_loopback();
490 tdb_writeunlock(pppdb);
493 * Configure the interface and mark it up, etc.
502 bundle_terminating = 0;
508 doing_callback = do_callback;
511 if (demand && !doing_callback) {
513 * Don't do anything until we see some activity.
515 new_phase(PHASE_DORMANT);
520 if (kill_link && !persist)
522 if (get_loop_output())
526 if (kill_link && !persist)
530 * Now we want to bring up the link.
533 info("Starting link");
536 gettimeofday(&start_time, NULL);
537 script_unsetenv("CONNECT_TIME");
538 script_unsetenv("BYTES_SENT");
539 script_unsetenv("BYTES_RCVD");
541 lcp_open(0); /* Start protocol */
542 while (phase != PHASE_DEAD) {
546 bundle_terminating = 1;
547 lcp_close(0, "User request");
548 if (phase == PHASE_MASTER)
549 mp_bundle_terminated();
552 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
553 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
554 (*ccp_protent.open)(0);
559 if (!persist || (maxfail > 0 && unsuccess >= maxfail))
564 t = need_holdoff? holdoff: 0;
566 t = (*holdoff_hook)();
568 new_phase(PHASE_HOLDOFF);
569 TIMEOUT(holdoff_end, NULL, t);
573 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
574 } while (phase == PHASE_HOLDOFF);
580 /* Wait for scripts to finish */
582 if (n_children > 0) {
584 TIMEOUT(childwait_end, NULL, child_wait);
586 struct subprocess *chp;
587 dbglog("Waiting for %d child processes...", n_children);
588 for (chp = children; chp != NULL; chp = chp->next)
589 dbglog(" script %s, pid %d", chp->prog, chp->pid);
591 while (n_children > 0 && !childwait_done) {
593 if (kill_link && !childwait_done)
603 * handle_events - wait for something to happen and respond to it.
610 kill_link = open_ccp_flag = 0;
611 if (sigsetjmp(sigjmp, 1) == 0) {
612 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
613 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
614 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
617 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
618 wait_input(timeleft(&timo));
624 info("Hangup (SIGHUP)");
627 if (status != EXIT_HANGUP)
628 status = EXIT_USER_REQUEST;
631 info("Terminating on signal %d", got_sigterm);
634 status = EXIT_USER_REQUEST;
639 reap_kids(); /* Don't leave dead kids lying around */
648 * setup_signals - initialize signal handling.
656 * Compute mask of all interesting signals and install signal handlers
657 * for each. Only one signal handler may be active at a time. Therefore,
658 * all other signals should be masked when any handler is executing.
660 sigemptyset(&signals_handled);
661 sigaddset(&signals_handled, SIGHUP);
662 sigaddset(&signals_handled, SIGINT);
663 sigaddset(&signals_handled, SIGTERM);
664 sigaddset(&signals_handled, SIGCHLD);
665 sigaddset(&signals_handled, SIGUSR2);
667 #define SIGNAL(s, handler) do { \
668 sa.sa_handler = handler; \
669 if (sigaction(s, &sa, NULL) < 0) \
670 fatal("Couldn't establish signal handler (%d): %m", s); \
673 sa.sa_mask = signals_handled;
675 SIGNAL(SIGHUP, hup); /* Hangup */
676 SIGNAL(SIGINT, term); /* Interrupt */
677 SIGNAL(SIGTERM, term); /* Terminate */
678 SIGNAL(SIGCHLD, chld);
680 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
681 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
684 * Install a handler for other signals which would otherwise
685 * cause pppd to exit without cleaning up.
687 SIGNAL(SIGABRT, bad_signal);
688 SIGNAL(SIGALRM, bad_signal);
689 SIGNAL(SIGFPE, bad_signal);
690 SIGNAL(SIGILL, bad_signal);
691 SIGNAL(SIGPIPE, bad_signal);
692 SIGNAL(SIGQUIT, bad_signal);
693 SIGNAL(SIGSEGV, bad_signal);
695 SIGNAL(SIGBUS, bad_signal);
698 SIGNAL(SIGEMT, bad_signal);
701 SIGNAL(SIGPOLL, bad_signal);
704 SIGNAL(SIGPROF, bad_signal);
707 SIGNAL(SIGSYS, bad_signal);
710 SIGNAL(SIGTRAP, bad_signal);
713 SIGNAL(SIGVTALRM, bad_signal);
716 SIGNAL(SIGXCPU, bad_signal);
719 SIGNAL(SIGXFSZ, bad_signal);
723 * Apparently we can get a SIGPIPE when we call syslog, if
724 * syslogd has died and been restarted. Ignoring it seems
727 signal(SIGPIPE, SIG_IGN);
731 * set_ifunit - do things we need to do once we know which ppp
738 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
739 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
740 script_setenv("IFNAME", ifname, iskey);
742 create_pidfile(getpid()); /* write pid to file */
743 create_linkpidfile(getpid());
748 * detach - detach us from the controlling terminal.
759 if (pipe(pipefd) == -1)
760 pipefd[0] = pipefd[1] = -1;
761 if ((pid = fork()) < 0) {
762 error("Couldn't detach (fork failed: %m)");
763 die(1); /* or just return? */
767 notify(pidchange, pid);
768 /* update pid files if they have been written already */
772 create_linkpidfile(pid);
773 exit(0); /* parent dies */
783 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
784 script_setenv("PPPD_PID", numbuf, 1);
786 /* wait for parent to finish updating pid & lock files and die */
788 complete_read(pipefd[0], numbuf, 1);
793 * reopen_log - (re)open our connection to syslog.
798 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
799 setlogmask(LOG_UPTO(LOG_INFO));
803 * Create a file containing our process ID.
811 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
812 _PATH_VARRUN, ifname);
813 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
814 fprintf(pidfile, "%d\n", pid);
815 (void) fclose(pidfile);
817 error("Failed to create pid file %s: %m", pidfilename);
823 create_linkpidfile(pid)
828 if (linkname[0] == 0)
830 script_setenv("LINKNAME", linkname, 1);
831 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
832 _PATH_VARRUN, linkname);
833 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
834 fprintf(pidfile, "%d\n", pid);
836 fprintf(pidfile, "%s\n", ifname);
837 (void) fclose(pidfile);
839 error("Failed to create pid file %s: %m", linkpidfile);
845 * remove_pidfile - remove our pid files
847 void remove_pidfiles()
849 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
850 warn("unable to delete pid file %s: %m", pidfilename);
852 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
853 warn("unable to delete pid file %s: %m", linkpidfile);
858 * holdoff_end - called via a timeout when the holdoff period ends.
864 new_phase(PHASE_DORMANT);
867 /* List of protocol names, to make our messages a little more informative. */
868 struct protocol_list {
871 } protocol_list[] = {
873 { 0x23, "OSI Network Layer" },
874 { 0x25, "Xerox NS IDP" },
875 { 0x27, "DECnet Phase IV" },
876 { 0x29, "Appletalk" },
877 { 0x2b, "Novell IPX" },
878 { 0x2d, "VJ compressed TCP/IP" },
879 { 0x2f, "VJ uncompressed TCP/IP" },
880 { 0x31, "Bridging PDU" },
881 { 0x33, "Stream Protocol ST-II" },
882 { 0x35, "Banyan Vines" },
883 { 0x39, "AppleTalk EDDP" },
884 { 0x3b, "AppleTalk SmartBuffered" },
885 { 0x3d, "Multi-Link" },
886 { 0x3f, "NETBIOS Framing" },
887 { 0x41, "Cisco Systems" },
888 { 0x43, "Ascom Timeplex" },
889 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
890 { 0x47, "DCA Remote Lan" },
891 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
892 { 0x4b, "SNA over 802.2" },
894 { 0x4f, "IP6 Header Compression" },
895 { 0x6f, "Stampede Bridging" },
896 { 0xfb, "single-link compression" },
897 { 0xfd, "1st choice compression" },
898 { 0x0201, "802.1d Hello Packets" },
899 { 0x0203, "IBM Source Routing BPDU" },
900 { 0x0205, "DEC LANBridge100 Spanning Tree" },
901 { 0x0231, "Luxcom" },
902 { 0x0233, "Sigma Network Systems" },
903 { 0x8021, "Internet Protocol Control Protocol" },
904 { 0x8023, "OSI Network Layer Control Protocol" },
905 { 0x8025, "Xerox NS IDP Control Protocol" },
906 { 0x8027, "DECnet Phase IV Control Protocol" },
907 { 0x8029, "Appletalk Control Protocol" },
908 { 0x802b, "Novell IPX Control Protocol" },
909 { 0x8031, "Bridging NCP" },
910 { 0x8033, "Stream Protocol Control Protocol" },
911 { 0x8035, "Banyan Vines Control Protocol" },
912 { 0x803d, "Multi-Link Control Protocol" },
913 { 0x803f, "NETBIOS Framing Control Protocol" },
914 { 0x8041, "Cisco Systems Control Protocol" },
915 { 0x8043, "Ascom Timeplex" },
916 { 0x8045, "Fujitsu LBLB Control Protocol" },
917 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
918 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
919 { 0x804b, "SNA over 802.2 Control Protocol" },
920 { 0x804d, "SNA Control Protocol" },
921 { 0x804f, "IP6 Header Compression Control Protocol" },
922 { 0x006f, "Stampede Bridging Control Protocol" },
923 { 0x80fb, "Single Link Compression Control Protocol" },
924 { 0x80fd, "Compression Control Protocol" },
925 { 0xc021, "Link Control Protocol" },
926 { 0xc023, "Password Authentication Protocol" },
927 { 0xc025, "Link Quality Report" },
928 { 0xc027, "Shiva Password Authentication Protocol" },
929 { 0xc029, "CallBack Control Protocol (CBCP)" },
930 { 0xc081, "Container Control Protocol" },
931 { 0xc223, "Challenge Handshake Authentication Protocol" },
932 { 0xc281, "Proprietary Authentication Protocol" },
937 * protocol_name - find a name for a PPP protocol.
943 struct protocol_list *lp;
945 for (lp = protocol_list; lp->proto != 0; ++lp)
946 if (proto == lp->proto)
952 * get_input - called when incoming data is available.
960 struct protent *protp;
962 p = inpacket_buf; /* point to beginning of packet buffer */
964 len = read_packet(inpacket_buf);
969 if (bundle_eof && multilink_master) {
970 notice("Last channel has disconnected");
971 mp_bundle_terminated();
974 notice("Modem hangup");
976 status = EXIT_HANGUP;
977 lcp_lowerdown(0); /* serial link is no longer available */
982 if (len < PPP_HDRLEN) {
983 dbglog("received short packet:%.*B", len, p);
987 dump_packet("rcvd", p, len);
988 if (snoop_recv_hook) snoop_recv_hook(p, len);
990 p += 2; /* Skip address and control */
991 GETSHORT(protocol, p);
995 * Toss all non-LCP packets unless LCP is OPEN.
997 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
998 dbglog("Discarded non-LCP packet when LCP not open");
1003 * Until we get past the authentication phase, toss all packets
1004 * except LCP, LQR and authentication packets.
1006 if (phase <= PHASE_AUTHENTICATE
1007 && !(protocol == PPP_LCP || protocol == PPP_LQR
1008 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1009 protocol == PPP_EAP)) {
1010 dbglog("discarding proto 0x%x in phase %d",
1016 * Upcall the proper protocol input routine.
1018 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1019 if (protp->protocol == protocol && protp->enabled_flag) {
1020 (*protp->input)(0, p, len);
1023 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1024 && protp->datainput != NULL) {
1025 (*protp->datainput)(0, p, len);
1031 const char *pname = protocol_name(protocol);
1033 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1035 warn("Unsupported protocol 0x%x received", protocol);
1037 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1041 * ppp_send_config - configure the transmit-side characteristics of
1042 * the ppp interface. Returns -1, indicating an error, if the channel
1043 * send_config procedure called error() (or incremented error_count
1044 * itself), otherwise 0.
1047 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1054 if (the_channel->send_config == NULL)
1057 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1058 return (error_count != errs)? -1: 0;
1062 * ppp_recv_config - configure the receive-side characteristics of
1063 * the ppp interface. Returns -1, indicating an error, if the channel
1064 * recv_config procedure called error() (or incremented error_count
1065 * itself), otherwise 0.
1068 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1075 if (the_channel->recv_config == NULL)
1078 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1079 return (error_count != errs)? -1: 0;
1083 * new_phase - signal the start of a new phase of pppd's operation.
1091 (*new_phase_hook)(p);
1092 notify(phasechange, p);
1096 * die - clean up state and exit with the specified status.
1102 if (!doing_multilink || multilink_master)
1105 notify(exitnotify, status);
1106 syslog(LOG_INFO, "Exit.");
1111 * cleanup - restore anything which needs to be restored before we exit
1120 the_channel->disestablish_ppp(devfd);
1121 if (the_channel->cleanup)
1122 (*the_channel->cleanup)();
1136 * Print connect time and statistics.
1138 if (link_stats_valid) {
1139 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1140 info("Connect time %d.%d minutes.", t/10, t%10);
1141 info("Sent %u bytes, received %u bytes.",
1142 link_stats.bytes_out, link_stats.bytes_in);
1143 link_stats_valid = 0;
1148 * reset_link_stats - "reset" stats when link goes up.
1154 if (!get_ppp_stats(u, &old_link_stats))
1156 gettimeofday(&start_time, NULL);
1160 * update_link_stats - get stats at link termination.
1163 update_link_stats(u)
1169 if (!get_ppp_stats(u, &link_stats)
1170 || gettimeofday(&now, NULL) < 0)
1172 link_connect_time = now.tv_sec - start_time.tv_sec;
1173 link_stats_valid = 1;
1175 link_stats.bytes_in -= old_link_stats.bytes_in;
1176 link_stats.bytes_out -= old_link_stats.bytes_out;
1177 link_stats.pkts_in -= old_link_stats.pkts_in;
1178 link_stats.pkts_out -= old_link_stats.pkts_out;
1180 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1181 script_setenv("CONNECT_TIME", numbuf, 0);
1182 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1183 script_setenv("BYTES_SENT", numbuf, 0);
1184 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1185 script_setenv("BYTES_RCVD", numbuf, 0);
1190 struct timeval c_time; /* time at which to call routine */
1191 void *c_arg; /* argument to routine */
1192 void (*c_func) __P((void *)); /* routine */
1193 struct callout *c_next;
1196 static struct callout *callout = NULL; /* Callout list */
1197 static struct timeval timenow; /* Current time */
1200 * timeout - Schedule a timeout.
1203 timeout(func, arg, secs, usecs)
1204 void (*func) __P((void *));
1208 struct callout *newp, *p, **pp;
1213 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1214 fatal("Out of memory in timeout()!");
1216 newp->c_func = func;
1217 gettimeofday(&timenow, NULL);
1218 newp->c_time.tv_sec = timenow.tv_sec + secs;
1219 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1220 if (newp->c_time.tv_usec >= 1000000) {
1221 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1222 newp->c_time.tv_usec %= 1000000;
1226 * Find correct place and link it in.
1228 for (pp = &callout; (p = *pp); pp = &p->c_next)
1229 if (newp->c_time.tv_sec < p->c_time.tv_sec
1230 || (newp->c_time.tv_sec == p->c_time.tv_sec
1231 && newp->c_time.tv_usec < p->c_time.tv_usec))
1239 * untimeout - Unschedule a timeout.
1242 untimeout(func, arg)
1243 void (*func) __P((void *));
1246 struct callout **copp, *freep;
1249 * Find first matching timeout and remove it from the list.
1251 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1252 if (freep->c_func == func && freep->c_arg == arg) {
1253 *copp = freep->c_next;
1254 free((char *) freep);
1261 * calltimeout - Call any timeout routines which are now due.
1268 while (callout != NULL) {
1271 if (gettimeofday(&timenow, NULL) < 0)
1272 fatal("Failed to get time of day: %m");
1273 if (!(p->c_time.tv_sec < timenow.tv_sec
1274 || (p->c_time.tv_sec == timenow.tv_sec
1275 && p->c_time.tv_usec <= timenow.tv_usec)))
1276 break; /* no, it's not time yet */
1278 callout = p->c_next;
1279 (*p->c_func)(p->c_arg);
1287 * timeleft - return the length of time until the next timeout is due.
1289 static struct timeval *
1291 struct timeval *tvp;
1293 if (callout == NULL)
1296 gettimeofday(&timenow, NULL);
1297 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1298 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1299 if (tvp->tv_usec < 0) {
1300 tvp->tv_usec += 1000000;
1303 if (tvp->tv_sec < 0)
1304 tvp->tv_sec = tvp->tv_usec = 0;
1311 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1312 * We assume that sig is currently blocked.
1318 struct sigaction act, oldact;
1320 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1321 act.sa_handler = SIG_IGN;
1325 * The kill() above made the signal pending for us, as well as
1326 * the rest of our process group, but we don't want it delivered
1327 * to us. It is blocked at the moment. Setting it to be ignored
1328 * will cause the pending signal to be discarded. If we did the
1329 * kill() after setting the signal to be ignored, it is unspecified
1330 * (by POSIX) whether the signal is immediately discarded or left
1331 * pending, and in fact Linux would leave it pending, and so it
1332 * would be delivered after the current signal handler exits,
1333 * leading to an infinite loop.
1335 sigaction(sig, &act, &oldact);
1336 sigaction(sig, &oldact, NULL);
1341 * hup - Catch SIGHUP signal.
1343 * Indicates that the physical layer has been disconnected.
1344 * We don't rely on this indication; if the user has sent this
1345 * signal, we just take the link down.
1351 /* can't log a message here, it can deadlock */
1354 /* Send the signal to the [dis]connector process(es) also */
1356 notify(sigreceived, sig);
1358 siglongjmp(sigjmp, 1);
1363 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1365 * Indicates that we should initiate a graceful disconnect and exit.
1372 /* can't log a message here, it can deadlock */
1375 /* Send the signal to the [dis]connector process(es) also */
1377 notify(sigreceived, sig);
1379 siglongjmp(sigjmp, 1);
1384 * chld - Catch SIGCHLD signal.
1385 * Sets a flag so we will call reap_kids in the mainline.
1393 siglongjmp(sigjmp, 1);
1398 * toggle_debug - Catch SIGUSR1 signal.
1400 * Toggle debug flag.
1409 setlogmask(LOG_UPTO(LOG_DEBUG));
1411 setlogmask(LOG_UPTO(LOG_WARNING));
1417 * open_ccp - Catch SIGUSR2 signal.
1419 * Try to (re)negotiate compression.
1428 siglongjmp(sigjmp, 1);
1433 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1439 static int crashed = 0;
1444 error("Fatal signal %d", sig);
1446 kill_my_pg(SIGTERM);
1447 notify(sigreceived, sig);
1452 * safe_fork - Create a child process. The child closes all the
1453 * file descriptors that we don't want to leak to a script.
1454 * The parent waits for the child to do this before returning.
1455 * This also arranges for the specified fds to be dup'd to
1456 * fds 0, 1, 2 in the child.
1459 safe_fork(int infd, int outfd, int errfd)
1465 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1466 while ((fd = dup(fd_devnull)) >= 0) {
1473 if (pipe(pipefd) == -1)
1474 pipefd[0] = pipefd[1] = -1;
1477 error("fork failed: %m");
1483 /* this read() blocks until the close(pipefd[1]) below */
1484 complete_read(pipefd[0], buf, 1);
1489 /* Executing in the child */
1495 /* make sure infd, outfd and errfd won't get tromped on below */
1496 if (infd == 1 || infd == 2)
1498 if (outfd == 0 || outfd == 2)
1500 if (errfd == 0 || errfd == 1)
1503 /* dup the in, out, err fds to 0, 1, 2 */
1514 if (the_channel->close)
1515 (*the_channel->close)();
1517 close(devfd); /* some plugins don't have a close function */
1527 notify(fork_notifier, 0);
1529 /* this close unblocks the read() call above in the parent */
1536 * device_script - run a program to talk to the specified fds
1537 * (e.g. to run the connector or disconnector script).
1538 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1541 device_script(program, in, out, dont_wait)
1553 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1556 pid = safe_fork(in, out, errfd);
1558 if (pid != 0 && log_to_fd < 0)
1563 error("Failed to create child process: %m");
1569 record_child(pid, program, NULL, NULL);
1572 while (waitpid(pid, &status, 0) < 0) {
1575 fatal("error waiting for (dis)connection process: %m");
1579 return (status == 0 ? 0 : -1);
1582 /* here we are executing in the child */
1586 if (getuid() != uid) {
1587 fprintf(stderr, "pppd: setuid failed\n");
1590 execl("/bin/sh", "sh", "-c", program, (char *)0);
1591 perror("pppd: could not exec /bin/sh");
1598 * run-program - execute a program with given arguments,
1599 * but don't wait for it.
1600 * If the program can't be executed, logs an error unless
1601 * must_exist is 0 and the program file doesn't exist.
1602 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1603 * or isn't an executable plain file, or the process ID of the child.
1604 * If done != NULL, (*done)(arg) will be called later (within
1605 * reap_kids) iff the return value is > 0.
1608 run_program(prog, args, must_exist, done, arg)
1612 void (*done) __P((void *));
1619 * First check if the file exists and is executable.
1620 * We don't use access() because that would use the
1621 * real user-id, which might not be root, and the script
1622 * might be accessible only to root.
1625 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1626 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1627 if (must_exist || errno != ENOENT)
1628 warn("Can't execute %s: %m", prog);
1632 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1634 error("Failed to create child process for %s: %m", prog);
1639 dbglog("Script %s started (pid %d)", prog, pid);
1640 record_child(pid, prog, done, arg);
1644 /* Leave the current location */
1645 (void) setsid(); /* No controlling tty. */
1646 (void) umask (S_IRWXG|S_IRWXO);
1647 (void) chdir ("/"); /* no current directory. */
1648 setuid(0); /* set real UID = root */
1652 /* Force the priority back to zero if pppd is running higher. */
1653 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1654 warn("can't reset priority to 0: %m");
1657 /* run the program */
1658 execve(prog, args, script_env);
1659 if (must_exist || errno != ENOENT) {
1660 /* have to reopen the log, there's nowhere else
1661 for the message to go. */
1663 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1671 * record_child - add a child process to the list for reap_kids
1675 record_child(pid, prog, done, arg)
1678 void (*done) __P((void *));
1681 struct subprocess *chp;
1685 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1687 warn("losing track of %s process", prog);
1693 chp->next = children;
1699 * childwait_end - we got fed up waiting for the child processes to
1700 * exit, send them all a SIGTERM.
1706 struct subprocess *chp;
1708 for (chp = children; chp != NULL; chp = chp->next) {
1710 dbglog("sending SIGTERM to process %d", chp->pid);
1711 kill(chp->pid, SIGTERM);
1717 * reap_kids - get status from any dead child processes,
1718 * and log a message for abnormal terminations.
1724 struct subprocess *chp, **prevp;
1726 if (n_children == 0)
1728 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1729 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1730 if (chp->pid == pid) {
1736 if (WIFSIGNALED(status)) {
1737 warn("Child process %s (pid %d) terminated with signal %d",
1738 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1740 dbglog("Script %s finished (pid %d), status = 0x%x",
1741 (chp? chp->prog: "??"), pid,
1742 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1743 if (chp && chp->done)
1744 (*chp->done)(chp->arg);
1749 if (errno == ECHILD)
1752 error("Error waiting for child process: %m");
1758 * add_notifier - add a new function to be called when something happens.
1761 add_notifier(notif, func, arg)
1762 struct notifier **notif;
1766 struct notifier *np;
1768 np = malloc(sizeof(struct notifier));
1770 novm("notifier struct");
1778 * remove_notifier - remove a function from the list of things to
1779 * be called when something happens.
1782 remove_notifier(notif, func, arg)
1783 struct notifier **notif;
1787 struct notifier *np;
1789 for (; (np = *notif) != 0; notif = &np->next) {
1790 if (np->func == func && np->arg == arg) {
1799 * notify - call a set of functions registered with add_notifier.
1803 struct notifier *notif;
1806 struct notifier *np;
1808 while ((np = notif) != 0) {
1810 (*np->func)(np->arg, val);
1815 * novm - log an error message saying we ran out of memory, and die.
1821 fatal("Virtual memory exhausted allocating %s\n", msg);
1825 * script_setenv - set an environment variable value to be used
1826 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1829 script_setenv(var, value, iskey)
1833 size_t varl = strlen(var);
1834 size_t vl = varl + strlen(value) + 2;
1836 char *p, *newstring;
1838 newstring = (char *) malloc(vl+1);
1841 *newstring++ = iskey;
1842 slprintf(newstring, vl, "%s=%s", var, value);
1844 /* check if this variable is already set */
1845 if (script_env != 0) {
1846 for (i = 0; (p = script_env[i]) != 0; ++i) {
1847 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1849 if (p[-1] && pppdb != NULL)
1853 script_env[i] = newstring;
1855 if (iskey && pppdb != NULL)
1856 add_db_key(newstring);
1863 /* no space allocated for script env. ptrs. yet */
1865 script_env = (char **) malloc(16 * sizeof(char *));
1866 if (script_env == 0)
1871 /* reallocate script_env with more space if needed */
1872 if (i + 1 >= s_env_nalloc) {
1874 char **newenv = (char **) realloc((void *)script_env,
1875 new_n * sizeof(char *));
1878 script_env = newenv;
1879 s_env_nalloc = new_n;
1882 script_env[i] = newstring;
1883 script_env[i+1] = 0;
1886 if (pppdb != NULL) {
1888 add_db_key(newstring);
1895 * script_unsetenv - remove a variable from the environment
1899 script_unsetenv(var)
1902 int vl = strlen(var);
1906 if (script_env == 0)
1908 for (i = 0; (p = script_env[i]) != 0; ++i) {
1909 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1911 if (p[-1] && pppdb != NULL)
1915 while ((script_env[i] = script_env[i+1]) != 0)
1928 * update_db_entry - update our entry in the database.
1937 if (script_env == NULL)
1940 for (i = 0; (p = script_env[i]) != 0; ++i)
1941 vlen += strlen(p) + 1;
1942 vbuf = malloc(vlen + 1);
1944 novm("database entry");
1946 for (i = 0; (p = script_env[i]) != 0; ++i)
1947 q += slprintf(q, vbuf + vlen - q, "%s;", p);
1950 key.dsize = strlen(db_key);
1953 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1954 error("tdb_store failed: %s", tdb_error(pppdb));
1962 * add_db_key - add a key that we can use to look up our database entry.
1970 key.dptr = (char *) str;
1971 key.dsize = strlen(str);
1973 dbuf.dsize = strlen(db_key);
1974 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
1975 error("tdb_store key failed: %s", tdb_error(pppdb));
1979 * delete_db_key - delete a key for looking up our database entry.
1987 key.dptr = (char *) str;
1988 key.dsize = strlen(str);
1989 tdb_delete(pppdb, key);
1993 * cleanup_db - delete all the entries we put in the database.
2003 key.dsize = strlen(db_key);
2004 tdb_delete(pppdb, key);
2005 for (i = 0; (p = script_env[i]) != 0; ++i)
2009 #endif /* USE_TDB */