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 1.152 2005/08/25 23:59:34 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 */
182 static sigset_t signals_handled;
184 static sigjmp_buf sigjmp;
186 char **script_env; /* Env. variable values for scripts */
187 int s_env_nalloc; /* # words avail at script_env */
189 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
190 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
192 static int n_children; /* # child processes still running */
193 static int got_sigchld; /* set if we have received a SIGCHLD */
195 int privopen; /* don't lock, open device as root */
197 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
199 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
200 int ngroups; /* How many groups valid in groups */
202 static struct timeval start_time; /* Time when link was started. */
204 static struct pppd_stats old_link_stats;
205 struct pppd_stats link_stats;
206 unsigned link_connect_time;
207 int link_stats_valid;
212 bool bundle_terminating;
215 * We maintain a list of child process pids and
216 * functions to call when they exit.
221 void (*done) __P((void *));
223 struct subprocess *next;
226 static struct subprocess *children;
228 /* Prototypes for procedures local to this file. */
230 static void setup_signals __P((void));
231 static void create_pidfile __P((int pid));
232 static void create_linkpidfile __P((int pid));
233 static void cleanup __P((void));
234 static void get_input __P((void));
235 static void calltimeout __P((void));
236 static struct timeval *timeleft __P((struct timeval *));
237 static void kill_my_pg __P((int));
238 static void hup __P((int));
239 static void term __P((int));
240 static void chld __P((int));
241 static void toggle_debug __P((int));
242 static void open_ccp __P((int));
243 static void bad_signal __P((int));
244 static void holdoff_end __P((void *));
245 static int reap_kids __P((void));
246 static void childwait_end __P((void *));
249 static void update_db_entry __P((void));
250 static void add_db_key __P((const char *));
251 static void delete_db_key __P((const char *));
252 static void cleanup_db __P((void));
255 static void handle_events __P((void));
256 void print_link_stats __P((void));
258 extern char *ttyname __P((int));
259 extern char *getlogin __P((void));
260 int main __P((int, char *[]));
264 #define O_NONBLOCK O_NDELAY
268 #define setlogmask(x)
272 * PPP Data Link Layer "protocol" table.
273 * One entry per supported protocol.
274 * The last entry must be NULL.
276 struct protent *protocols[] = {
300 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
302 #if !defined(PPP_DRV_NAME)
303 #define PPP_DRV_NAME "ppp"
304 #endif /* !defined(PPP_DRV_NAME) */
314 struct protent *protp;
317 link_stats_valid = 0;
318 new_phase(PHASE_INITIALIZE);
322 /* Initialize syslog facilities */
325 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
326 option_error("Couldn't get hostname: %m");
329 hostname[MAXNAMELEN-1] = 0;
331 /* make sure we don't create world or group writable files. */
332 umask(umask(0777) | 022);
335 privileged = uid == 0;
336 slprintf(numbuf, sizeof(numbuf), "%d", uid);
337 script_setenv("ORIG_UID", numbuf, 0);
339 ngroups = getgroups(NGROUPS_MAX, groups);
342 * Initialize magic number generator now so that protocols may
343 * use magic numbers in initialization.
348 * Initialize each protocol.
350 for (i = 0; (protp = protocols[i]) != NULL; ++i)
354 * Initialize the default channel.
361 * Parse, in order, the system options file, the user's options file,
362 * and the command line arguments.
364 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
365 || !options_from_user()
366 || !parse_args(argc-1, argv+1))
367 exit(EXIT_OPTION_ERROR);
368 devnam_fixed = 1; /* can no longer change device name */
371 * Work out the device name, if it hasn't already been specified,
372 * and parse the tty's options file.
374 if (the_channel->process_extra_options)
375 (*the_channel->process_extra_options)();
378 setlogmask(LOG_UPTO(LOG_DEBUG));
381 * Check that we are running as root.
383 if (geteuid() != 0) {
384 option_error("must be root to run %s, since it is not setuid-root",
389 if (!ppp_available()) {
390 option_error("%s", no_ppp_msg);
391 exit(EXIT_NO_KERNEL_SUPPORT);
395 * Check that the options given are valid and consistent.
398 if (!sys_check_options())
399 exit(EXIT_OPTION_ERROR);
400 auth_check_options();
401 #ifdef HAVE_MULTILINK
404 for (i = 0; (protp = protocols[i]) != NULL; ++i)
405 if (protp->check_options != NULL)
406 (*protp->check_options)();
407 if (the_channel->check_options)
408 (*the_channel->check_options)();
411 if (dump_options || dryrun) {
412 init_pr_log(NULL, LOG_INFO);
413 print_options(pr_log, NULL);
420 /* Make sure fds 0, 1, 2 are open to somewhere. */
421 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
423 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
424 while (fd_devnull <= 2) {
427 fatal("Critical shortage of file descriptors: dup failed: %m");
432 * Initialize system-dependent stuff.
437 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
439 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
442 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
444 warn("Warning: disabling multilink");
451 * Detach ourselves from the terminal, if required,
452 * and identify who is running us.
454 if (!nodetach && !updetach)
459 if (pw != NULL && pw->pw_name != NULL)
464 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
465 script_setenv("PPPLOGNAME", p, 0);
468 script_setenv("DEVICE", devnam, 1);
469 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
470 script_setenv("PPPD_PID", numbuf, 1);
474 create_linkpidfile(getpid());
479 * If we're doing dial-on-demand, set up the interface now.
483 * Open the loopback channel and set it up to be the ppp interface.
485 fd_loop = open_ppp_loopback();
488 * Configure the interface and mark it up, etc.
497 bundle_terminating = 0;
503 doing_callback = do_callback;
506 if (demand && !doing_callback) {
508 * Don't do anything until we see some activity.
510 new_phase(PHASE_DORMANT);
517 if (get_loop_output())
525 * Now we want to bring up the link.
528 info("Starting link");
531 gettimeofday(&start_time, NULL);
532 script_unsetenv("CONNECT_TIME");
533 script_unsetenv("BYTES_SENT");
534 script_unsetenv("BYTES_RCVD");
536 lcp_open(0); /* Start protocol */
538 while (phase != PHASE_DEAD) {
542 lcp_close(0, "User request");
544 bundle_terminating = 1;
545 if (phase == PHASE_MASTER)
546 mp_bundle_terminated();
549 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
550 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
551 (*ccp_protent.open)(0);
555 /* restore FSMs to original state */
558 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
563 t = need_holdoff? holdoff: 0;
565 t = (*holdoff_hook)();
567 new_phase(PHASE_HOLDOFF);
568 TIMEOUT(holdoff_end, NULL, t);
572 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
573 } while (phase == PHASE_HOLDOFF);
579 /* Wait for scripts to finish */
581 if (n_children > 0) {
583 TIMEOUT(childwait_end, NULL, child_wait);
585 struct subprocess *chp;
586 dbglog("Waiting for %d child processes...", n_children);
587 for (chp = children; chp != NULL; chp = chp->next)
588 dbglog(" script %s, pid %d", chp->prog, chp->pid);
590 while (n_children > 0 && !childwait_done) {
592 if (kill_link && !childwait_done)
602 * handle_events - wait for something to happen and respond to it.
609 kill_link = open_ccp_flag = 0;
610 if (sigsetjmp(sigjmp, 1) == 0) {
611 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
612 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
613 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
616 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
617 wait_input(timeleft(&timo));
623 info("Hangup (SIGHUP)");
626 if (status != EXIT_HANGUP)
627 status = EXIT_USER_REQUEST;
630 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 { 0x51, "KNX Bridging Data" },
896 { 0x53, "Encryption" },
897 { 0x55, "Individual Link Encryption" },
899 { 0x59, "PPP Muxing" },
900 { 0x5b, "Vendor-Specific Network Protocol" },
901 { 0x61, "RTP IPHC Full Header" },
902 { 0x63, "RTP IPHC Compressed TCP" },
903 { 0x65, "RTP IPHC Compressed non-TCP" },
904 { 0x67, "RTP IPHC Compressed UDP 8" },
905 { 0x69, "RTP IPHC Compressed RTP 8" },
906 { 0x6f, "Stampede Bridging" },
908 { 0xc1, "NTCITS IPI" },
909 { 0xfb, "single-link compression" },
910 { 0xfd, "Compressed Datagram" },
911 { 0x0201, "802.1d Hello Packets" },
912 { 0x0203, "IBM Source Routing BPDU" },
913 { 0x0205, "DEC LANBridge100 Spanning Tree" },
914 { 0x0207, "Cisco Discovery Protocol" },
915 { 0x0209, "Netcs Twin Routing" },
916 { 0x020b, "STP - Scheduled Transfer Protocol" },
917 { 0x020d, "EDP - Extreme Discovery Protocol" },
918 { 0x0211, "Optical Supervisory Channel Protocol" },
919 { 0x0213, "Optical Supervisory Channel Protocol" },
920 { 0x0231, "Luxcom" },
921 { 0x0233, "Sigma Network Systems" },
922 { 0x0235, "Apple Client Server Protocol" },
923 { 0x0281, "MPLS Unicast" },
924 { 0x0283, "MPLS Multicast" },
925 { 0x0285, "IEEE p1284.4 standard - data packets" },
926 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
927 { 0x0289, "Multichannel Flow Treatment Protocol" },
928 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
929 { 0x2065, "RTP IPHC Context State" },
930 { 0x2067, "RTP IPHC Compressed UDP 16" },
931 { 0x2069, "RTP IPHC Compressed RTP 16" },
932 { 0x4001, "Cray Communications Control Protocol" },
933 { 0x4003, "CDPD Mobile Network Registration Protocol" },
934 { 0x4005, "Expand accelerator protocol" },
935 { 0x4007, "ODSICP NCP" },
936 { 0x4009, "DOCSIS DLL" },
937 { 0x400B, "Cetacean Network Detection Protocol" },
938 { 0x4021, "Stacker LZS" },
939 { 0x4023, "RefTek Protocol" },
940 { 0x4025, "Fibre Channel" },
941 { 0x4027, "EMIT Protocols" },
942 { 0x405b, "Vendor-Specific Protocol (VSP)" },
943 { 0x8021, "Internet Protocol Control Protocol" },
944 { 0x8023, "OSI Network Layer Control Protocol" },
945 { 0x8025, "Xerox NS IDP Control Protocol" },
946 { 0x8027, "DECnet Phase IV Control Protocol" },
947 { 0x8029, "Appletalk Control Protocol" },
948 { 0x802b, "Novell IPX Control Protocol" },
949 { 0x8031, "Bridging NCP" },
950 { 0x8033, "Stream Protocol Control Protocol" },
951 { 0x8035, "Banyan Vines Control Protocol" },
952 { 0x803d, "Multi-Link Control Protocol" },
953 { 0x803f, "NETBIOS Framing Control Protocol" },
954 { 0x8041, "Cisco Systems Control Protocol" },
955 { 0x8043, "Ascom Timeplex" },
956 { 0x8045, "Fujitsu LBLB Control Protocol" },
957 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
958 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
959 { 0x804b, "SNA over 802.2 Control Protocol" },
960 { 0x804d, "SNA Control Protocol" },
961 { 0x804f, "IP6 Header Compression Control Protocol" },
962 { 0x8051, "KNX Bridging Control Protocol" },
963 { 0x8053, "Encryption Control Protocol" },
964 { 0x8055, "Individual Link Encryption Control Protocol" },
965 { 0x8057, "IPv6 Control Protovol" },
966 { 0x8059, "PPP Muxing Control Protocol" },
967 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
968 { 0x806f, "Stampede Bridging Control Protocol" },
969 { 0x8073, "MP+ Control Protocol" },
970 { 0x80c1, "NTCITS IPI Control Protocol" },
971 { 0x80fb, "Single Link Compression Control Protocol" },
972 { 0x80fd, "Compression Control Protocol" },
973 { 0x8207, "Cisco Discovery Protocol Control" },
974 { 0x8209, "Netcs Twin Routing" },
975 { 0x820b, "STP - Control Protocol" },
976 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
977 { 0x8235, "Apple Client Server Protocol Control" },
978 { 0x8281, "MPLSCP" },
979 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
980 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
981 { 0x8289, "Multichannel Flow Treatment Protocol" },
982 { 0xc021, "Link Control Protocol" },
983 { 0xc023, "Password Authentication Protocol" },
984 { 0xc025, "Link Quality Report" },
985 { 0xc027, "Shiva Password Authentication Protocol" },
986 { 0xc029, "CallBack Control Protocol (CBCP)" },
987 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
989 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
990 { 0xc081, "Container Control Protocol" },
991 { 0xc223, "Challenge Handshake Authentication Protocol" },
992 { 0xc225, "RSA Authentication Protocol" },
993 { 0xc227, "Extensible Authentication Protocol" },
994 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
995 { 0xc26f, "Stampede Bridging Authorization Protocol" },
996 { 0xc281, "Proprietary Authentication Protocol" },
997 { 0xc283, "Proprietary Authentication Protocol" },
998 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1003 * protocol_name - find a name for a PPP protocol.
1006 protocol_name(proto)
1009 struct protocol_list *lp;
1011 for (lp = protocol_list; lp->proto != 0; ++lp)
1012 if (proto == lp->proto)
1018 * get_input - called when incoming data is available.
1026 struct protent *protp;
1028 p = inpacket_buf; /* point to beginning of packet buffer */
1030 len = read_packet(inpacket_buf);
1035 if (bundle_eof && multilink_master) {
1036 notice("Last channel has disconnected");
1037 mp_bundle_terminated();
1040 notice("Modem hangup");
1042 status = EXIT_HANGUP;
1043 lcp_lowerdown(0); /* serial link is no longer available */
1048 if (len < PPP_HDRLEN) {
1049 dbglog("received short packet:%.*B", len, p);
1053 dump_packet("rcvd", p, len);
1054 if (snoop_recv_hook) snoop_recv_hook(p, len);
1056 p += 2; /* Skip address and control */
1057 GETSHORT(protocol, p);
1061 * Toss all non-LCP packets unless LCP is OPEN.
1063 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1064 dbglog("Discarded non-LCP packet when LCP not open");
1069 * Until we get past the authentication phase, toss all packets
1070 * except LCP, LQR and authentication packets.
1072 if (phase <= PHASE_AUTHENTICATE
1073 && !(protocol == PPP_LCP || protocol == PPP_LQR
1074 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1075 protocol == PPP_EAP)) {
1076 dbglog("discarding proto 0x%x in phase %d",
1082 * Upcall the proper protocol input routine.
1084 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1085 if (protp->protocol == protocol && protp->enabled_flag) {
1086 (*protp->input)(0, p, len);
1089 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1090 && protp->datainput != NULL) {
1091 (*protp->datainput)(0, p, len);
1097 const char *pname = protocol_name(protocol);
1099 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1101 warn("Unsupported protocol 0x%x received", protocol);
1103 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1107 * ppp_send_config - configure the transmit-side characteristics of
1108 * the ppp interface. Returns -1, indicating an error, if the channel
1109 * send_config procedure called error() (or incremented error_count
1110 * itself), otherwise 0.
1113 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1120 if (the_channel->send_config == NULL)
1123 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1124 return (error_count != errs)? -1: 0;
1128 * ppp_recv_config - configure the receive-side characteristics of
1129 * the ppp interface. Returns -1, indicating an error, if the channel
1130 * recv_config procedure called error() (or incremented error_count
1131 * itself), otherwise 0.
1134 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1141 if (the_channel->recv_config == NULL)
1144 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1145 return (error_count != errs)? -1: 0;
1149 * new_phase - signal the start of a new phase of pppd's operation.
1157 (*new_phase_hook)(p);
1158 notify(phasechange, p);
1162 * die - clean up state and exit with the specified status.
1168 if (!doing_multilink || multilink_master)
1171 notify(exitnotify, status);
1172 syslog(LOG_INFO, "Exit.");
1177 * cleanup - restore anything which needs to be restored before we exit
1186 the_channel->disestablish_ppp(devfd);
1187 if (the_channel->cleanup)
1188 (*the_channel->cleanup)();
1202 * Print connect time and statistics.
1204 if (link_stats_valid) {
1205 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1206 info("Connect time %d.%d minutes.", t/10, t%10);
1207 info("Sent %u bytes, received %u bytes.",
1208 link_stats.bytes_out, link_stats.bytes_in);
1209 link_stats_valid = 0;
1214 * reset_link_stats - "reset" stats when link goes up.
1220 if (!get_ppp_stats(u, &old_link_stats))
1222 gettimeofday(&start_time, NULL);
1226 * update_link_stats - get stats at link termination.
1229 update_link_stats(u)
1235 if (!get_ppp_stats(u, &link_stats)
1236 || gettimeofday(&now, NULL) < 0)
1238 link_connect_time = now.tv_sec - start_time.tv_sec;
1239 link_stats_valid = 1;
1241 link_stats.bytes_in -= old_link_stats.bytes_in;
1242 link_stats.bytes_out -= old_link_stats.bytes_out;
1243 link_stats.pkts_in -= old_link_stats.pkts_in;
1244 link_stats.pkts_out -= old_link_stats.pkts_out;
1246 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1247 script_setenv("CONNECT_TIME", numbuf, 0);
1248 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1249 script_setenv("BYTES_SENT", numbuf, 0);
1250 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1251 script_setenv("BYTES_RCVD", numbuf, 0);
1256 struct timeval c_time; /* time at which to call routine */
1257 void *c_arg; /* argument to routine */
1258 void (*c_func) __P((void *)); /* routine */
1259 struct callout *c_next;
1262 static struct callout *callout = NULL; /* Callout list */
1263 static struct timeval timenow; /* Current time */
1266 * timeout - Schedule a timeout.
1269 timeout(func, arg, secs, usecs)
1270 void (*func) __P((void *));
1274 struct callout *newp, *p, **pp;
1279 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1280 fatal("Out of memory in timeout()!");
1282 newp->c_func = func;
1283 gettimeofday(&timenow, NULL);
1284 newp->c_time.tv_sec = timenow.tv_sec + secs;
1285 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1286 if (newp->c_time.tv_usec >= 1000000) {
1287 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1288 newp->c_time.tv_usec %= 1000000;
1292 * Find correct place and link it in.
1294 for (pp = &callout; (p = *pp); pp = &p->c_next)
1295 if (newp->c_time.tv_sec < p->c_time.tv_sec
1296 || (newp->c_time.tv_sec == p->c_time.tv_sec
1297 && newp->c_time.tv_usec < p->c_time.tv_usec))
1305 * untimeout - Unschedule a timeout.
1308 untimeout(func, arg)
1309 void (*func) __P((void *));
1312 struct callout **copp, *freep;
1315 * Find first matching timeout and remove it from the list.
1317 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1318 if (freep->c_func == func && freep->c_arg == arg) {
1319 *copp = freep->c_next;
1320 free((char *) freep);
1327 * calltimeout - Call any timeout routines which are now due.
1334 while (callout != NULL) {
1337 if (gettimeofday(&timenow, NULL) < 0)
1338 fatal("Failed to get time of day: %m");
1339 if (!(p->c_time.tv_sec < timenow.tv_sec
1340 || (p->c_time.tv_sec == timenow.tv_sec
1341 && p->c_time.tv_usec <= timenow.tv_usec)))
1342 break; /* no, it's not time yet */
1344 callout = p->c_next;
1345 (*p->c_func)(p->c_arg);
1353 * timeleft - return the length of time until the next timeout is due.
1355 static struct timeval *
1357 struct timeval *tvp;
1359 if (callout == NULL)
1362 gettimeofday(&timenow, NULL);
1363 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1364 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1365 if (tvp->tv_usec < 0) {
1366 tvp->tv_usec += 1000000;
1369 if (tvp->tv_sec < 0)
1370 tvp->tv_sec = tvp->tv_usec = 0;
1377 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1378 * We assume that sig is currently blocked.
1384 struct sigaction act, oldact;
1386 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1387 act.sa_handler = SIG_IGN;
1391 * The kill() above made the signal pending for us, as well as
1392 * the rest of our process group, but we don't want it delivered
1393 * to us. It is blocked at the moment. Setting it to be ignored
1394 * will cause the pending signal to be discarded. If we did the
1395 * kill() after setting the signal to be ignored, it is unspecified
1396 * (by POSIX) whether the signal is immediately discarded or left
1397 * pending, and in fact Linux would leave it pending, and so it
1398 * would be delivered after the current signal handler exits,
1399 * leading to an infinite loop.
1401 sigaction(sig, &act, &oldact);
1402 sigaction(sig, &oldact, NULL);
1407 * hup - Catch SIGHUP signal.
1409 * Indicates that the physical layer has been disconnected.
1410 * We don't rely on this indication; if the user has sent this
1411 * signal, we just take the link down.
1417 /* can't log a message here, it can deadlock */
1420 /* Send the signal to the [dis]connector process(es) also */
1422 notify(sigreceived, sig);
1424 siglongjmp(sigjmp, 1);
1429 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1431 * Indicates that we should initiate a graceful disconnect and exit.
1438 /* can't log a message here, it can deadlock */
1441 /* Send the signal to the [dis]connector process(es) also */
1443 notify(sigreceived, sig);
1445 siglongjmp(sigjmp, 1);
1450 * chld - Catch SIGCHLD signal.
1451 * Sets a flag so we will call reap_kids in the mainline.
1459 siglongjmp(sigjmp, 1);
1464 * toggle_debug - Catch SIGUSR1 signal.
1466 * Toggle debug flag.
1475 setlogmask(LOG_UPTO(LOG_DEBUG));
1477 setlogmask(LOG_UPTO(LOG_WARNING));
1483 * open_ccp - Catch SIGUSR2 signal.
1485 * Try to (re)negotiate compression.
1494 siglongjmp(sigjmp, 1);
1499 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1505 static int crashed = 0;
1510 error("Fatal signal %d", sig);
1512 kill_my_pg(SIGTERM);
1513 notify(sigreceived, sig);
1518 * safe_fork - Create a child process. The child closes all the
1519 * file descriptors that we don't want to leak to a script.
1520 * The parent waits for the child to do this before returning.
1521 * This also arranges for the specified fds to be dup'd to
1522 * fds 0, 1, 2 in the child.
1525 safe_fork(int infd, int outfd, int errfd)
1531 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1532 while ((fd = dup(fd_devnull)) >= 0) {
1539 if (pipe(pipefd) == -1)
1540 pipefd[0] = pipefd[1] = -1;
1543 error("fork failed: %m");
1549 /* this read() blocks until the close(pipefd[1]) below */
1550 complete_read(pipefd[0], buf, 1);
1555 /* Executing in the child */
1561 /* make sure infd, outfd and errfd won't get tromped on below */
1562 if (infd == 1 || infd == 2)
1564 if (outfd == 0 || outfd == 2)
1566 if (errfd == 0 || errfd == 1)
1569 /* dup the in, out, err fds to 0, 1, 2 */
1580 if (the_channel->close)
1581 (*the_channel->close)();
1583 close(devfd); /* some plugins don't have a close function */
1593 notify(fork_notifier, 0);
1595 /* this close unblocks the read() call above in the parent */
1602 * device_script - run a program to talk to the specified fds
1603 * (e.g. to run the connector or disconnector script).
1604 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1607 device_script(program, in, out, dont_wait)
1619 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1622 pid = safe_fork(in, out, errfd);
1624 if (pid != 0 && log_to_fd < 0)
1629 error("Failed to create child process: %m");
1635 record_child(pid, program, NULL, NULL);
1638 while (waitpid(pid, &status, 0) < 0) {
1641 fatal("error waiting for (dis)connection process: %m");
1645 return (status == 0 ? 0 : -1);
1648 /* here we are executing in the child */
1652 if (getuid() != uid) {
1653 fprintf(stderr, "pppd: setuid failed\n");
1656 execl("/bin/sh", "sh", "-c", program, (char *)0);
1657 perror("pppd: could not exec /bin/sh");
1664 * run-program - execute a program with given arguments,
1665 * but don't wait for it unless wait is non-zero.
1666 * If the program can't be executed, logs an error unless
1667 * must_exist is 0 and the program file doesn't exist.
1668 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1669 * or isn't an executable plain file, or the process ID of the child.
1670 * If done != NULL, (*done)(arg) will be called later (within
1671 * reap_kids) iff the return value is > 0.
1674 run_program(prog, args, must_exist, done, arg, wait)
1678 void (*done) __P((void *));
1686 * First check if the file exists and is executable.
1687 * We don't use access() because that would use the
1688 * real user-id, which might not be root, and the script
1689 * might be accessible only to root.
1692 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1693 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1694 if (must_exist || errno != ENOENT)
1695 warn("Can't execute %s: %m", prog);
1699 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1701 error("Failed to create child process for %s: %m", prog);
1706 dbglog("Script %s started (pid %d)", prog, pid);
1707 record_child(pid, prog, done, arg);
1709 while (waitpid(pid, &status, 0) < 0) {
1712 fatal("error waiting for script %s: %m", prog);
1719 /* Leave the current location */
1720 (void) setsid(); /* No controlling tty. */
1721 (void) umask (S_IRWXG|S_IRWXO);
1722 (void) chdir ("/"); /* no current directory. */
1723 setuid(0); /* set real UID = root */
1727 /* Force the priority back to zero if pppd is running higher. */
1728 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1729 warn("can't reset priority to 0: %m");
1732 /* run the program */
1733 execve(prog, args, script_env);
1734 if (must_exist || errno != ENOENT) {
1735 /* have to reopen the log, there's nowhere else
1736 for the message to go. */
1738 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1746 * record_child - add a child process to the list for reap_kids
1750 record_child(pid, prog, done, arg)
1753 void (*done) __P((void *));
1756 struct subprocess *chp;
1760 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1762 warn("losing track of %s process", prog);
1768 chp->next = children;
1774 * childwait_end - we got fed up waiting for the child processes to
1775 * exit, send them all a SIGTERM.
1781 struct subprocess *chp;
1783 for (chp = children; chp != NULL; chp = chp->next) {
1785 dbglog("sending SIGTERM to process %d", chp->pid);
1786 kill(chp->pid, SIGTERM);
1792 * reap_kids - get status from any dead child processes,
1793 * and log a message for abnormal terminations.
1799 struct subprocess *chp, **prevp;
1801 if (n_children == 0)
1803 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1804 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1805 if (chp->pid == pid) {
1811 if (WIFSIGNALED(status)) {
1812 warn("Child process %s (pid %d) terminated with signal %d",
1813 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1815 dbglog("Script %s finished (pid %d), status = 0x%x",
1816 (chp? chp->prog: "??"), pid,
1817 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1818 if (chp && chp->done)
1819 (*chp->done)(chp->arg);
1824 if (errno == ECHILD)
1827 error("Error waiting for child process: %m");
1833 * add_notifier - add a new function to be called when something happens.
1836 add_notifier(notif, func, arg)
1837 struct notifier **notif;
1841 struct notifier *np;
1843 np = malloc(sizeof(struct notifier));
1845 novm("notifier struct");
1853 * remove_notifier - remove a function from the list of things to
1854 * be called when something happens.
1857 remove_notifier(notif, func, arg)
1858 struct notifier **notif;
1862 struct notifier *np;
1864 for (; (np = *notif) != 0; notif = &np->next) {
1865 if (np->func == func && np->arg == arg) {
1874 * notify - call a set of functions registered with add_notifier.
1878 struct notifier *notif;
1881 struct notifier *np;
1883 while ((np = notif) != 0) {
1885 (*np->func)(np->arg, val);
1890 * novm - log an error message saying we ran out of memory, and die.
1896 fatal("Virtual memory exhausted allocating %s\n", msg);
1900 * script_setenv - set an environment variable value to be used
1901 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1904 script_setenv(var, value, iskey)
1908 size_t varl = strlen(var);
1909 size_t vl = varl + strlen(value) + 2;
1911 char *p, *newstring;
1913 newstring = (char *) malloc(vl+1);
1916 *newstring++ = iskey;
1917 slprintf(newstring, vl, "%s=%s", var, value);
1919 /* check if this variable is already set */
1920 if (script_env != 0) {
1921 for (i = 0; (p = script_env[i]) != 0; ++i) {
1922 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1924 if (p[-1] && pppdb != NULL)
1928 script_env[i] = newstring;
1930 if (iskey && pppdb != NULL)
1931 add_db_key(newstring);
1938 /* no space allocated for script env. ptrs. yet */
1940 script_env = (char **) malloc(16 * sizeof(char *));
1941 if (script_env == 0)
1946 /* reallocate script_env with more space if needed */
1947 if (i + 1 >= s_env_nalloc) {
1949 char **newenv = (char **) realloc((void *)script_env,
1950 new_n * sizeof(char *));
1953 script_env = newenv;
1954 s_env_nalloc = new_n;
1957 script_env[i] = newstring;
1958 script_env[i+1] = 0;
1961 if (pppdb != NULL) {
1963 add_db_key(newstring);
1970 * script_unsetenv - remove a variable from the environment
1974 script_unsetenv(var)
1977 int vl = strlen(var);
1981 if (script_env == 0)
1983 for (i = 0; (p = script_env[i]) != 0; ++i) {
1984 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1986 if (p[-1] && pppdb != NULL)
1990 while ((script_env[i] = script_env[i+1]) != 0)
2002 * Any arbitrary string used as a key for locking the database.
2003 * It doesn't matter what it is as long as all pppds use the same string.
2005 #define PPPD_LOCK_KEY "pppd lock"
2008 * lock_db - get an exclusive lock on the TDB database.
2009 * Used to ensure atomicity of various lookup/modify operations.
2016 key.dptr = PPPD_LOCK_KEY;
2017 key.dsize = strlen(key.dptr);
2018 tdb_chainlock(pppdb, key);
2023 * unlock_db - remove the exclusive lock obtained by lock_db.
2030 key.dptr = PPPD_LOCK_KEY;
2031 key.dsize = strlen(key.dptr);
2032 tdb_chainunlock(pppdb, key);
2038 * update_db_entry - update our entry in the database.
2047 if (script_env == NULL)
2050 for (i = 0; (p = script_env[i]) != 0; ++i)
2051 vlen += strlen(p) + 1;
2052 vbuf = malloc(vlen + 1);
2054 novm("database entry");
2056 for (i = 0; (p = script_env[i]) != 0; ++i)
2057 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2060 key.dsize = strlen(db_key);
2063 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2064 error("tdb_store failed: %s", tdb_error(pppdb));
2072 * add_db_key - add a key that we can use to look up our database entry.
2080 key.dptr = (char *) str;
2081 key.dsize = strlen(str);
2083 dbuf.dsize = strlen(db_key);
2084 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2085 error("tdb_store key failed: %s", tdb_error(pppdb));
2089 * delete_db_key - delete a key for looking up our database entry.
2097 key.dptr = (char *) str;
2098 key.dsize = strlen(str);
2099 tdb_delete(pppdb, key);
2103 * cleanup_db - delete all the entries we put in the database.
2113 key.dsize = strlen(db_key);
2114 tdb_delete(pppdb, key);
2115 for (i = 0; (p = script_env[i]) != 0; ++i)
2119 #endif /* USE_TDB */