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 1.148 2004/11/13 12:05:48 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>
93 #include <cutils/properties.h>
104 #include "chap-new.h"
108 #include "pathnames.h"
120 #endif /* IPX_CHANGE */
125 static const char rcsid[] = RCSID;
128 char ifname[32]; /* Interface name */
129 int ifunit; /* Interface unit number */
131 struct channel *the_channel;
133 char *progname; /* Name of this program */
134 char hostname[MAXNAMELEN]; /* Our hostname */
135 static char pidfilename[MAXPATHLEN]; /* name of pid file */
136 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
137 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
138 uid_t uid; /* Our real user-id */
139 struct notifier *pidchange = NULL;
140 struct notifier *phasechange = NULL;
141 struct notifier *exitnotify = NULL;
142 struct notifier *sigreceived = NULL;
143 struct notifier *fork_notifier = NULL;
145 int hungup; /* terminal has been hung up */
146 int privileged; /* we're running as real uid root */
147 int need_holdoff; /* need holdoff period before restarting */
148 int detached; /* have detached from terminal */
149 volatile int status; /* exit status for pppd */
150 int unsuccess; /* # unsuccessful connection attempts */
151 int do_callback; /* != 0 if we should do callback next */
152 int doing_callback; /* != 0 if we are doing callback */
153 int ppp_session_number; /* Session number, for channels with such a
154 concept (eg PPPoE) */
155 int childwait_done; /* have timed out waiting for children */
158 TDB_CONTEXT *pppdb; /* database for storing status etc. */
163 int (*holdoff_hook) __P((void)) = NULL;
164 int (*new_phase_hook) __P((int)) = NULL;
165 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
166 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
168 static int conn_running; /* we have a [dis]connector running */
169 static int fd_loop; /* fd for getting demand-dial packets */
171 int fd_devnull; /* fd for /dev/null */
172 int devfd = -1; /* fd of underlying device */
173 int fd_ppp = -1; /* fd for talking PPP */
174 int phase; /* where the link is at */
183 static sigset_t signals_handled;
185 static sigjmp_buf sigjmp;
187 char **script_env; /* Env. variable values for scripts */
188 int s_env_nalloc; /* # words avail at script_env */
190 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
191 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
193 static int n_children; /* # child processes still running */
194 static int got_sigchld; /* set if we have received a SIGCHLD */
196 int privopen; /* don't lock, open device as root */
198 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
200 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
201 int ngroups; /* How many groups valid in groups */
203 static struct timeval start_time; /* Time when link was started. */
205 static struct pppd_stats old_link_stats;
206 struct pppd_stats link_stats;
207 unsigned link_connect_time;
208 int link_stats_valid;
213 bool bundle_terminating;
215 int sent_since_received = 0;
217 int received_total = 0;
220 * We maintain a list of child process pids and
221 * functions to call when they exit.
226 void (*done) __P((void *));
228 struct subprocess *next;
231 static struct subprocess *children;
233 /* Prototypes for procedures local to this file. */
235 static void setup_signals __P((void));
236 static void create_pidfile __P((int pid));
237 static void create_linkpidfile __P((int pid));
238 static void cleanup __P((void));
239 static void get_input __P((void));
240 static void calltimeout __P((void));
241 static struct timeval *timeleft __P((struct timeval *));
242 static void kill_my_pg __P((int));
243 static void hup __P((int));
244 static void term __P((int));
245 static void chld __P((int));
246 static void toggle_debug __P((int));
247 static void open_ccp __P((int));
248 static void bad_signal __P((int));
249 static void holdoff_end __P((void *));
250 static int reap_kids __P((void));
251 static void childwait_end __P((void *));
254 static void update_db_entry __P((void));
255 static void add_db_key __P((const char *));
256 static void delete_db_key __P((const char *));
257 static void cleanup_db __P((void));
260 static void handle_events __P((void));
261 void print_link_stats __P((void));
263 extern char *ttyname __P((int));
264 extern char *getlogin __P((void));
265 int main __P((int, char *[]));
269 #define O_NONBLOCK O_NDELAY
273 #define setlogmask(x)
277 * PPP Data Link Layer "protocol" table.
278 * One entry per supported protocol.
279 * The last entry must be NULL.
281 struct protent *protocols[] = {
305 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
307 #if !defined(PPP_DRV_NAME)
308 #define PPP_DRV_NAME "ppp"
309 #endif /* !defined(PPP_DRV_NAME) */
319 struct protent *protp;
322 link_stats_valid = 0;
323 new_phase(PHASE_INITIALIZE);
327 /* Initialize syslog facilities */
330 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
331 option_error("Couldn't get hostname: %m");
334 hostname[MAXNAMELEN-1] = 0;
336 /* make sure we don't create world or group writable files. */
337 umask(umask(0777) | 022);
340 privileged = uid == 0;
341 slprintf(numbuf, sizeof(numbuf), "%d", uid);
342 script_setenv("ORIG_UID", numbuf, 0);
344 ngroups = getgroups(NGROUPS_MAX, groups);
347 * Initialize magic number generator now so that protocols may
348 * use magic numbers in initialization.
353 * Initialize each protocol.
355 for (i = 0; (protp = protocols[i]) != NULL; ++i)
359 * Initialize the default channel.
363 #ifdef ANDROID_CHANGES
365 extern void pppox_init();
374 * Parse, in order, the system options file, the user's options file,
375 * and the command line arguments.
377 #ifdef ANDROID_CHANGES
378 /* Android: only take options from commandline */
379 if (!parse_args(argc-1, argv+1))
380 exit(EXIT_OPTION_ERROR);
383 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
384 || !options_from_user()
385 || !parse_args(argc-1, argv+1))
386 exit(EXIT_OPTION_ERROR);
390 devnam_fixed = 1; /* can no longer change device name */
393 * Work out the device name, if it hasn't already been specified,
394 * and parse the tty's options file.
396 if (the_channel->process_extra_options)
397 (*the_channel->process_extra_options)();
400 setlogmask(LOG_UPTO(LOG_DEBUG));
402 #ifndef ANDROID_CHANGES
404 * Check that we are running as root.
406 if (geteuid() != 0) {
407 option_error("must be root to run %s, since it is not setuid-root",
413 if (!ppp_available()) {
414 option_error("%s", no_ppp_msg);
415 exit(EXIT_NO_KERNEL_SUPPORT);
419 * Check that the options given are valid and consistent.
422 if (!sys_check_options())
423 exit(EXIT_OPTION_ERROR);
424 auth_check_options();
425 #ifdef HAVE_MULTILINK
428 for (i = 0; (protp = protocols[i]) != NULL; ++i)
429 if (protp->check_options != NULL)
430 (*protp->check_options)();
431 if (the_channel->check_options)
432 (*the_channel->check_options)();
435 if (dump_options || dryrun) {
436 init_pr_log(NULL, LOG_INFO);
437 print_options(pr_log, NULL);
444 /* Make sure fds 0, 1, 2 are open to somewhere. */
445 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
447 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
448 while (fd_devnull <= 2) {
451 fatal("Critical shortage of file descriptors: dup failed: %m");
456 * Initialize system-dependent stuff.
460 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
462 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
465 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
467 warn("Warning: disabling multilink");
474 * Detach ourselves from the terminal, if required,
475 * and identify who is running us.
477 if (!nodetach && !updetach)
482 if (pw != NULL && pw->pw_name != NULL)
487 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
488 script_setenv("PPPLOGNAME", p, 0);
491 script_setenv("DEVICE", devnam, 1);
492 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
493 script_setenv("PPPD_PID", numbuf, 1);
497 create_linkpidfile(getpid());
502 * If we're doing dial-on-demand, set up the interface now.
506 * Open the loopback channel and set it up to be the ppp interface.
508 fd_loop = open_ppp_loopback();
511 * Configure the interface and mark it up, etc.
520 bundle_terminating = 0;
526 doing_callback = do_callback;
529 if (demand && !doing_callback) {
531 * Don't do anything until we see some activity.
533 new_phase(PHASE_DORMANT);
540 if (get_loop_output())
548 * Now we want to bring up the link.
551 info("Starting link");
554 gettimeofday(&start_time, NULL);
555 script_unsetenv("CONNECT_TIME");
556 script_unsetenv("BYTES_SENT");
557 script_unsetenv("BYTES_RCVD");
559 lcp_open(0); /* Start protocol */
560 while (phase != PHASE_DEAD) {
564 lcp_close(0, "User request");
566 bundle_terminating = 1;
567 if (phase == PHASE_MASTER)
568 mp_bundle_terminated();
571 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
572 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
573 (*ccp_protent.open)(0);
578 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
583 t = need_holdoff? holdoff: 0;
585 t = (*holdoff_hook)();
587 new_phase(PHASE_HOLDOFF);
588 TIMEOUT(holdoff_end, NULL, t);
592 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
593 } while (phase == PHASE_HOLDOFF);
599 /* Wait for scripts to finish */
601 if (n_children > 0) {
603 TIMEOUT(childwait_end, NULL, child_wait);
605 struct subprocess *chp;
606 dbglog("Waiting for %d child processes...", n_children);
607 for (chp = children; chp != NULL; chp = chp->next)
608 dbglog(" script %s, pid %d", chp->prog, chp->pid);
610 while (n_children > 0 && !childwait_done) {
612 if (kill_link && !childwait_done)
622 * handle_events - wait for something to happen and respond to it.
629 kill_link = open_ccp_flag = 0;
630 if (sigsetjmp(sigjmp, 1) == 0) {
631 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
632 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
633 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
636 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
637 wait_input(timeleft(&timo));
643 info("Hangup (SIGHUP)");
646 if (status != EXIT_HANGUP)
647 status = EXIT_USER_REQUEST;
650 info("Terminating on signal %d", got_sigterm);
654 status = EXIT_USER_REQUEST;
659 reap_kids(); /* Don't leave dead kids lying around */
668 * setup_signals - initialize signal handling.
676 * Compute mask of all interesting signals and install signal handlers
677 * for each. Only one signal handler may be active at a time. Therefore,
678 * all other signals should be masked when any handler is executing.
680 sigemptyset(&signals_handled);
681 sigaddset(&signals_handled, SIGHUP);
682 sigaddset(&signals_handled, SIGINT);
683 sigaddset(&signals_handled, SIGTERM);
684 sigaddset(&signals_handled, SIGCHLD);
685 sigaddset(&signals_handled, SIGUSR2);
687 #define SIGNAL(s, handler) do { \
688 sa.sa_handler = handler; \
689 if (sigaction(s, &sa, NULL) < 0) \
690 fatal("Couldn't establish signal handler (%d): %m", s); \
693 sa.sa_mask = signals_handled;
695 SIGNAL(SIGHUP, hup); /* Hangup */
696 SIGNAL(SIGINT, term); /* Interrupt */
697 SIGNAL(SIGTERM, term); /* Terminate */
698 SIGNAL(SIGCHLD, chld);
700 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
701 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
704 * Install a handler for other signals which would otherwise
705 * cause pppd to exit without cleaning up.
707 SIGNAL(SIGABRT, bad_signal);
708 SIGNAL(SIGALRM, bad_signal);
709 SIGNAL(SIGFPE, bad_signal);
710 SIGNAL(SIGILL, bad_signal);
711 SIGNAL(SIGPIPE, bad_signal);
712 SIGNAL(SIGQUIT, bad_signal);
713 SIGNAL(SIGSEGV, bad_signal);
715 SIGNAL(SIGBUS, bad_signal);
718 SIGNAL(SIGEMT, bad_signal);
721 SIGNAL(SIGPOLL, bad_signal);
724 SIGNAL(SIGPROF, bad_signal);
727 SIGNAL(SIGSYS, bad_signal);
730 SIGNAL(SIGTRAP, bad_signal);
733 SIGNAL(SIGVTALRM, bad_signal);
736 SIGNAL(SIGXCPU, bad_signal);
739 SIGNAL(SIGXFSZ, bad_signal);
743 * Apparently we can get a SIGPIPE when we call syslog, if
744 * syslogd has died and been restarted. Ignoring it seems
747 signal(SIGPIPE, SIG_IGN);
751 * set_ifunit - do things we need to do once we know which ppp
758 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
759 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
760 script_setenv("IFNAME", ifname, iskey);
762 create_pidfile(getpid()); /* write pid to file */
763 create_linkpidfile(getpid());
768 * detach - detach us from the controlling terminal.
779 if (pipe(pipefd) == -1)
780 pipefd[0] = pipefd[1] = -1;
781 if ((pid = fork()) < 0) {
782 error("Couldn't detach (fork failed: %m)");
783 die(1); /* or just return? */
787 notify(pidchange, pid);
788 /* update pid files if they have been written already */
792 create_linkpidfile(pid);
793 exit(0); /* parent dies */
803 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
804 script_setenv("PPPD_PID", numbuf, 1);
806 /* wait for parent to finish updating pid & lock files and die */
808 complete_read(pipefd[0], numbuf, 1);
813 * reopen_log - (re)open our connection to syslog.
818 #ifndef ANDROID_CHANGES
819 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
820 setlogmask(LOG_UPTO(LOG_INFO));
825 * Create a file containing our process ID.
831 #ifndef ANDROID_CHANGES
834 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
835 _PATH_VARRUN, ifname);
836 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
837 fprintf(pidfile, "%d\n", pid);
838 (void) fclose(pidfile);
840 error("Failed to create pid file %s: %m", pidfilename);
847 create_linkpidfile(pid)
850 #ifndef ANDROID_CHANGES
853 if (linkname[0] == 0)
855 script_setenv("LINKNAME", linkname, 1);
856 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
857 _PATH_VARRUN, linkname);
858 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
859 fprintf(pidfile, "%d\n", pid);
861 fprintf(pidfile, "%s\n", ifname);
862 (void) fclose(pidfile);
864 error("Failed to create pid file %s: %m", linkpidfile);
871 * remove_pidfile - remove our pid files
873 void remove_pidfiles()
875 #ifndef ANDROID_CHANGES
876 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
877 warn("unable to delete pid file %s: %m", pidfilename);
879 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
880 warn("unable to delete pid file %s: %m", linkpidfile);
886 * holdoff_end - called via a timeout when the holdoff period ends.
892 new_phase(PHASE_DORMANT);
895 /* List of protocol names, to make our messages a little more informative. */
896 struct protocol_list {
899 } protocol_list[] = {
901 { 0x23, "OSI Network Layer" },
902 { 0x25, "Xerox NS IDP" },
903 { 0x27, "DECnet Phase IV" },
904 { 0x29, "Appletalk" },
905 { 0x2b, "Novell IPX" },
906 { 0x2d, "VJ compressed TCP/IP" },
907 { 0x2f, "VJ uncompressed TCP/IP" },
908 { 0x31, "Bridging PDU" },
909 { 0x33, "Stream Protocol ST-II" },
910 { 0x35, "Banyan Vines" },
911 { 0x39, "AppleTalk EDDP" },
912 { 0x3b, "AppleTalk SmartBuffered" },
913 { 0x3d, "Multi-Link" },
914 { 0x3f, "NETBIOS Framing" },
915 { 0x41, "Cisco Systems" },
916 { 0x43, "Ascom Timeplex" },
917 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
918 { 0x47, "DCA Remote Lan" },
919 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
920 { 0x4b, "SNA over 802.2" },
922 { 0x4f, "IP6 Header Compression" },
923 { 0x6f, "Stampede Bridging" },
924 { 0xfb, "single-link compression" },
925 { 0xfd, "1st choice compression" },
926 { 0x0201, "802.1d Hello Packets" },
927 { 0x0203, "IBM Source Routing BPDU" },
928 { 0x0205, "DEC LANBridge100 Spanning Tree" },
929 { 0x0231, "Luxcom" },
930 { 0x0233, "Sigma Network Systems" },
931 { 0x8021, "Internet Protocol Control Protocol" },
932 { 0x8023, "OSI Network Layer Control Protocol" },
933 { 0x8025, "Xerox NS IDP Control Protocol" },
934 { 0x8027, "DECnet Phase IV Control Protocol" },
935 { 0x8029, "Appletalk Control Protocol" },
936 { 0x802b, "Novell IPX Control Protocol" },
937 { 0x8031, "Bridging NCP" },
938 { 0x8033, "Stream Protocol Control Protocol" },
939 { 0x8035, "Banyan Vines Control Protocol" },
940 { 0x803d, "Multi-Link Control Protocol" },
941 { 0x803f, "NETBIOS Framing Control Protocol" },
942 { 0x8041, "Cisco Systems Control Protocol" },
943 { 0x8043, "Ascom Timeplex" },
944 { 0x8045, "Fujitsu LBLB Control Protocol" },
945 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
946 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
947 { 0x804b, "SNA over 802.2 Control Protocol" },
948 { 0x804d, "SNA Control Protocol" },
949 { 0x804f, "IP6 Header Compression Control Protocol" },
950 { 0x006f, "Stampede Bridging Control Protocol" },
951 { 0x80fb, "Single Link Compression Control Protocol" },
952 { 0x80fd, "Compression Control Protocol" },
953 { 0xc021, "Link Control Protocol" },
954 { 0xc023, "Password Authentication Protocol" },
955 { 0xc025, "Link Quality Report" },
956 { 0xc027, "Shiva Password Authentication Protocol" },
957 { 0xc029, "CallBack Control Protocol (CBCP)" },
958 { 0xc081, "Container Control Protocol" },
959 { 0xc223, "Challenge Handshake Authentication Protocol" },
960 { 0xc281, "Proprietary Authentication Protocol" },
965 * protocol_name - find a name for a PPP protocol.
971 struct protocol_list *lp;
973 for (lp = protocol_list; lp->proto != 0; ++lp)
974 if (proto == lp->proto)
980 * get_input - called when incoming data is available.
988 struct protent *protp;
990 p = inpacket_buf; /* point to beginning of packet buffer */
992 len = read_packet(inpacket_buf);
997 if (bundle_eof && multilink_master) {
998 notice("Last channel has disconnected");
999 mp_bundle_terminated();
1002 notice("Modem hangup");
1004 status = EXIT_HANGUP;
1005 lcp_lowerdown(0); /* serial link is no longer available */
1010 if (len < PPP_HDRLEN) {
1011 dbglog("received short packet:%.*B", len, p);
1015 dump_packet("rcvd", p, len);
1016 if (snoop_recv_hook) snoop_recv_hook(p, len);
1018 p += 2; /* Skip address and control */
1019 GETSHORT(protocol, p);
1023 * Toss all non-LCP packets unless LCP is OPEN.
1025 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1026 dbglog("Discarded non-LCP packet when LCP not open");
1031 * Until we get past the authentication phase, toss all packets
1032 * except LCP, LQR and authentication packets.
1034 if (phase <= PHASE_AUTHENTICATE
1035 && !(protocol == PPP_LCP || protocol == PPP_LQR
1036 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1037 protocol == PPP_EAP)) {
1038 dbglog("discarding proto 0x%x in phase %d",
1044 * Upcall the proper protocol input routine.
1046 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1047 if (protp->protocol == protocol && protp->enabled_flag) {
1048 (*protp->input)(0, p, len);
1051 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1052 && protp->datainput != NULL) {
1053 (*protp->datainput)(0, p, len);
1059 const char *pname = protocol_name(protocol);
1061 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1063 warn("Unsupported protocol 0x%x received", protocol);
1065 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1069 * ppp_send_config - configure the transmit-side characteristics of
1070 * the ppp interface. Returns -1, indicating an error, if the channel
1071 * send_config procedure called error() (or incremented error_count
1072 * itself), otherwise 0.
1075 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1082 if (the_channel->send_config == NULL)
1085 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1086 return (error_count != errs)? -1: 0;
1090 * ppp_recv_config - configure the receive-side characteristics of
1091 * the ppp interface. Returns -1, indicating an error, if the channel
1092 * recv_config procedure called error() (or incremented error_count
1093 * itself), otherwise 0.
1096 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1103 if (the_channel->recv_config == NULL)
1106 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1107 return (error_count != errs)? -1: 0;
1111 * new_phase - signal the start of a new phase of pppd's operation.
1119 (*new_phase_hook)(p);
1120 notify(phasechange, p);
1124 * die - clean up state and exit with the specified status.
1130 if (!doing_multilink || multilink_master)
1133 notify(exitnotify, status);
1134 syslog(LOG_INFO, "Exit.");
1139 * cleanup - restore anything which needs to be restored before we exit
1148 the_channel->disestablish_ppp(devfd);
1149 if (the_channel->cleanup)
1150 (*the_channel->cleanup)();
1164 * Print connect time and statistics.
1166 if (link_stats_valid) {
1167 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1168 info("Connect time %d.%d minutes.", t/10, t%10);
1169 info("Sent %u bytes, received %u bytes.",
1170 link_stats.bytes_out, link_stats.bytes_in);
1171 link_stats_valid = 0;
1176 * reset_link_stats - "reset" stats when link goes up.
1182 if (!get_ppp_stats(u, &old_link_stats))
1184 gettimeofday(&start_time, NULL);
1188 * update_link_stats - get stats at link termination.
1191 update_link_stats(u)
1197 if (!get_ppp_stats(u, &link_stats)
1198 || gettimeofday(&now, NULL) < 0)
1200 link_connect_time = now.tv_sec - start_time.tv_sec;
1201 link_stats_valid = 1;
1203 link_stats.bytes_in -= old_link_stats.bytes_in;
1204 link_stats.bytes_out -= old_link_stats.bytes_out;
1205 link_stats.pkts_in -= old_link_stats.pkts_in;
1206 link_stats.pkts_out -= old_link_stats.pkts_out;
1208 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1209 script_setenv("CONNECT_TIME", numbuf, 0);
1210 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1211 script_setenv("BYTES_SENT", numbuf, 0);
1212 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1213 script_setenv("BYTES_RCVD", numbuf, 0);
1218 struct timeval c_time; /* time at which to call routine */
1219 void *c_arg; /* argument to routine */
1220 void (*c_func) __P((void *)); /* routine */
1221 struct callout *c_next;
1224 static struct callout *callout = NULL; /* Callout list */
1225 static struct timeval timenow; /* Current time */
1228 * timeout - Schedule a timeout.
1231 timeout(func, arg, secs, usecs)
1232 void (*func) __P((void *));
1236 struct callout *newp, *p, **pp;
1241 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1242 fatal("Out of memory in timeout()!");
1244 newp->c_func = func;
1245 gettimeofday(&timenow, NULL);
1246 newp->c_time.tv_sec = timenow.tv_sec + secs;
1247 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1248 if (newp->c_time.tv_usec >= 1000000) {
1249 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1250 newp->c_time.tv_usec %= 1000000;
1254 * Find correct place and link it in.
1256 for (pp = &callout; (p = *pp); pp = &p->c_next)
1257 if (newp->c_time.tv_sec < p->c_time.tv_sec
1258 || (newp->c_time.tv_sec == p->c_time.tv_sec
1259 && newp->c_time.tv_usec < p->c_time.tv_usec))
1267 * untimeout - Unschedule a timeout.
1270 untimeout(func, arg)
1271 void (*func) __P((void *));
1274 struct callout **copp, *freep;
1277 * Find first matching timeout and remove it from the list.
1279 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1280 if (freep->c_func == func && freep->c_arg == arg) {
1281 *copp = freep->c_next;
1282 free((char *) freep);
1289 * calltimeout - Call any timeout routines which are now due.
1296 while (callout != NULL) {
1299 if (gettimeofday(&timenow, NULL) < 0)
1300 fatal("Failed to get time of day: %m");
1301 if (!(p->c_time.tv_sec < timenow.tv_sec
1302 || (p->c_time.tv_sec == timenow.tv_sec
1303 && p->c_time.tv_usec <= timenow.tv_usec)))
1304 break; /* no, it's not time yet */
1306 callout = p->c_next;
1307 (*p->c_func)(p->c_arg);
1315 * timeleft - return the length of time until the next timeout is due.
1317 static struct timeval *
1319 struct timeval *tvp;
1321 if (callout == NULL)
1324 gettimeofday(&timenow, NULL);
1325 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1326 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1327 if (tvp->tv_usec < 0) {
1328 tvp->tv_usec += 1000000;
1331 if (tvp->tv_sec < 0)
1332 tvp->tv_sec = tvp->tv_usec = 0;
1339 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1340 * We assume that sig is currently blocked.
1346 struct sigaction act, oldact;
1348 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1349 act.sa_handler = SIG_IGN;
1353 * The kill() above made the signal pending for us, as well as
1354 * the rest of our process group, but we don't want it delivered
1355 * to us. It is blocked at the moment. Setting it to be ignored
1356 * will cause the pending signal to be discarded. If we did the
1357 * kill() after setting the signal to be ignored, it is unspecified
1358 * (by POSIX) whether the signal is immediately discarded or left
1359 * pending, and in fact Linux would leave it pending, and so it
1360 * would be delivered after the current signal handler exits,
1361 * leading to an infinite loop.
1363 sigaction(sig, &act, &oldact);
1364 sigaction(sig, &oldact, NULL);
1369 * hup - Catch SIGHUP signal.
1371 * Indicates that the physical layer has been disconnected.
1372 * We don't rely on this indication; if the user has sent this
1373 * signal, we just take the link down.
1379 /* can't log a message here, it can deadlock */
1382 /* Send the signal to the [dis]connector process(es) also */
1384 notify(sigreceived, sig);
1386 siglongjmp(sigjmp, 1);
1391 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1393 * Indicates that we should initiate a graceful disconnect and exit.
1400 /* can't log a message here, it can deadlock */
1403 /* Send the signal to the [dis]connector process(es) also */
1405 notify(sigreceived, sig);
1407 siglongjmp(sigjmp, 1);
1412 * chld - Catch SIGCHLD signal.
1413 * Sets a flag so we will call reap_kids in the mainline.
1421 siglongjmp(sigjmp, 1);
1426 * toggle_debug - Catch SIGUSR1 signal.
1428 * Toggle debug flag.
1437 setlogmask(LOG_UPTO(LOG_DEBUG));
1439 setlogmask(LOG_UPTO(LOG_WARNING));
1445 * open_ccp - Catch SIGUSR2 signal.
1447 * Try to (re)negotiate compression.
1456 siglongjmp(sigjmp, 1);
1461 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1467 static int crashed = 0;
1472 error("Fatal signal %d", sig);
1474 kill_my_pg(SIGTERM);
1475 notify(sigreceived, sig);
1480 * safe_fork - Create a child process. The child closes all the
1481 * file descriptors that we don't want to leak to a script.
1482 * The parent waits for the child to do this before returning.
1483 * This also arranges for the specified fds to be dup'd to
1484 * fds 0, 1, 2 in the child.
1487 safe_fork(int infd, int outfd, int errfd)
1493 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1494 while ((fd = dup(fd_devnull)) >= 0) {
1501 if (pipe(pipefd) == -1)
1502 pipefd[0] = pipefd[1] = -1;
1505 error("fork failed: %m");
1511 /* this read() blocks until the close(pipefd[1]) below */
1512 complete_read(pipefd[0], buf, 1);
1517 /* Executing in the child */
1523 /* make sure infd, outfd and errfd won't get tromped on below */
1524 if (infd == 1 || infd == 2)
1526 if (outfd == 0 || outfd == 2)
1528 if (errfd == 0 || errfd == 1)
1531 /* dup the in, out, err fds to 0, 1, 2 */
1539 #ifndef ANDROID_CHANGES
1544 if (the_channel->close)
1545 (*the_channel->close)();
1547 close(devfd); /* some plugins don't have a close function */
1557 notify(fork_notifier, 0);
1559 /* this close unblocks the read() call above in the parent */
1566 * device_script - run a program to talk to the specified fds
1567 * (e.g. to run the connector or disconnector script).
1568 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1571 device_script(program, in, out, dont_wait)
1583 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1586 pid = safe_fork(in, out, errfd);
1588 if (pid != 0 && log_to_fd < 0)
1593 error("Failed to create child process: %m");
1599 record_child(pid, program, NULL, NULL);
1602 while (waitpid(pid, &status, 0) < 0) {
1605 fatal("error waiting for (dis)connection process: %m");
1609 return (status == 0 ? 0 : -1);
1612 /* here we are executing in the child */
1616 if (getuid() != uid) {
1617 fprintf(stderr, "pppd: setuid failed\n");
1620 execl("/system/bin/sh", "sh", "-c", program, NULL);
1621 perror("pppd: could not exec /bin/sh");
1628 * run-program - execute a program with given arguments,
1629 * but don't wait for it.
1630 * If the program can't be executed, logs an error unless
1631 * must_exist is 0 and the program file doesn't exist.
1632 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1633 * or isn't an executable plain file, or the process ID of the child.
1634 * If done != NULL, (*done)(arg) will be called later (within
1635 * reap_kids) iff the return value is > 0.
1638 run_program(prog, args, must_exist, done, arg)
1642 void (*done) __P((void *));
1648 #ifdef ANDROID_CHANGES
1649 /* Originally linkname is used to create named pid files, which is
1650 * meaningless to android. Here we use it as a suffix of program names,
1651 * so different users can run their own program by specifying it. For
1652 * example, "/etc/ppp/ip-up-vpn" will be executed when IPCP is up and
1653 * linkname is "vpn". Note that "/" is not allowed for security reasons. */
1654 char file[MAXPATHLEN];
1656 if (linkname[0] && !strchr(linkname, '/')) {
1657 snprintf(file, MAXPATHLEN, "%s-%s", prog, linkname);
1658 file[MAXPATHLEN - 1] = '\0';
1664 * First check if the file exists and is executable.
1665 * We don't use access() because that would use the
1666 * real user-id, which might not be root, and the script
1667 * might be accessible only to root.
1670 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1671 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1672 if (must_exist || errno != ENOENT)
1673 warn("Can't execute %s: %m", prog);
1677 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1679 error("Failed to create child process for %s: %m", prog);
1684 dbglog("Script %s started (pid %d)", prog, pid);
1685 record_child(pid, prog, done, arg);
1689 /* Leave the current location */
1690 (void) setsid(); /* No controlling tty. */
1691 (void) umask (S_IRWXG|S_IRWXO);
1692 (void) chdir ("/"); /* no current directory. */
1693 setuid(0); /* set real UID = root */
1697 /* Force the priority back to zero if pppd is running higher. */
1698 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1699 warn("can't reset priority to 0: %m");
1702 /* run the program */
1703 execve(prog, args, script_env);
1704 if (must_exist || errno != ENOENT) {
1705 #ifndef ANDROID_CHANGES
1706 /* have to reopen the log, there's nowhere else
1707 for the message to go. */
1709 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1712 error("Can't execute %s: %m", prog);
1720 * record_child - add a child process to the list for reap_kids
1724 record_child(pid, prog, done, arg)
1727 void (*done) __P((void *));
1730 struct subprocess *chp;
1734 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1736 warn("losing track of %s process", prog);
1742 chp->next = children;
1748 * childwait_end - we got fed up waiting for the child processes to
1749 * exit, send them all a SIGTERM.
1755 struct subprocess *chp;
1757 for (chp = children; chp != NULL; chp = chp->next) {
1759 dbglog("sending SIGTERM to process %d", chp->pid);
1760 kill(chp->pid, SIGTERM);
1766 * reap_kids - get status from any dead child processes,
1767 * and log a message for abnormal terminations.
1773 struct subprocess *chp, **prevp;
1775 if (n_children == 0)
1777 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1778 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1779 if (chp->pid == pid) {
1785 if (WIFSIGNALED(status)) {
1786 warn("Child process %s (pid %d) terminated with signal %d",
1787 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1789 dbglog("Script %s finished (pid %d), status = 0x%x",
1790 (chp? chp->prog: "??"), pid,
1791 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1792 if (chp && chp->done)
1793 (*chp->done)(chp->arg);
1798 if (errno == ECHILD)
1801 error("Error waiting for child process: %m");
1807 * add_notifier - add a new function to be called when something happens.
1810 add_notifier(notif, func, arg)
1811 struct notifier **notif;
1815 struct notifier *np;
1817 np = malloc(sizeof(struct notifier));
1819 novm("notifier struct");
1827 * remove_notifier - remove a function from the list of things to
1828 * be called when something happens.
1831 remove_notifier(notif, func, arg)
1832 struct notifier **notif;
1836 struct notifier *np;
1838 for (; (np = *notif) != 0; notif = &np->next) {
1839 if (np->func == func && np->arg == arg) {
1848 * notify - call a set of functions registered with add_notifier.
1852 struct notifier *notif;
1855 struct notifier *np;
1857 while ((np = notif) != 0) {
1859 (*np->func)(np->arg, val);
1864 * novm - log an error message saying we ran out of memory, and die.
1870 fatal("Virtual memory exhausted allocating %s\n", msg);
1874 * script_setenv - set an environment variable value to be used
1875 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1878 script_setenv(var, value, iskey)
1882 size_t varl = strlen(var);
1883 size_t vl = varl + strlen(value) + 2;
1885 char *p, *newstring;
1887 newstring = (char *) malloc(vl+1);
1890 *newstring++ = iskey;
1891 slprintf(newstring, vl, "%s=%s", var, value);
1893 /* check if this variable is already set */
1894 if (script_env != 0) {
1895 for (i = 0; (p = script_env[i]) != 0; ++i) {
1896 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1898 if (p[-1] && pppdb != NULL)
1902 script_env[i] = newstring;
1904 if (iskey && pppdb != NULL)
1905 add_db_key(newstring);
1912 /* no space allocated for script env. ptrs. yet */
1914 script_env = (char **) malloc(16 * sizeof(char *));
1915 if (script_env == 0)
1920 /* reallocate script_env with more space if needed */
1921 if (i + 1 >= s_env_nalloc) {
1923 char **newenv = (char **) realloc((void *)script_env,
1924 new_n * sizeof(char *));
1927 script_env = newenv;
1928 s_env_nalloc = new_n;
1931 script_env[i] = newstring;
1932 script_env[i+1] = 0;
1935 if (pppdb != NULL) {
1937 add_db_key(newstring);
1944 * script_unsetenv - remove a variable from the environment
1948 script_unsetenv(var)
1951 int vl = strlen(var);
1955 if (script_env == 0)
1957 for (i = 0; (p = script_env[i]) != 0; ++i) {
1958 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
1960 if (p[-1] && pppdb != NULL)
1964 while ((script_env[i] = script_env[i+1]) != 0)
1976 * Any arbitrary string used as a key for locking the database.
1977 * It doesn't matter what it is as long as all pppds use the same string.
1979 #define PPPD_LOCK_KEY "pppd lock"
1982 * lock_db - get an exclusive lock on the TDB database.
1983 * Used to ensure atomicity of various lookup/modify operations.
1990 key.dptr = PPPD_LOCK_KEY;
1991 key.dsize = strlen(key.dptr);
1992 tdb_chainlock(pppdb, key);
1997 * unlock_db - remove the exclusive lock obtained by lock_db.
2004 key.dptr = PPPD_LOCK_KEY;
2005 key.dsize = strlen(key.dptr);
2006 tdb_chainunlock(pppdb, key);
2012 * update_db_entry - update our entry in the database.
2021 if (script_env == NULL)
2024 for (i = 0; (p = script_env[i]) != 0; ++i)
2025 vlen += strlen(p) + 1;
2026 vbuf = malloc(vlen + 1);
2028 novm("database entry");
2030 for (i = 0; (p = script_env[i]) != 0; ++i)
2031 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2034 key.dsize = strlen(db_key);
2037 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2038 error("tdb_store failed: %s", tdb_error(pppdb));
2046 * add_db_key - add a key that we can use to look up our database entry.
2054 key.dptr = (char *) str;
2055 key.dsize = strlen(str);
2057 dbuf.dsize = strlen(db_key);
2058 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2059 error("tdb_store key failed: %s", tdb_error(pppdb));
2063 * delete_db_key - delete a key for looking up our database entry.
2071 key.dptr = (char *) str;
2072 key.dsize = strlen(str);
2073 tdb_delete(pppdb, key);
2077 * cleanup_db - delete all the entries we put in the database.
2087 key.dsize = strlen(db_key);
2088 tdb_delete(pppdb, key);
2089 for (i = 0; (p = script_env[i]) != 0; ++i)
2093 #endif /* USE_TDB */