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) 1999-2024 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. Redistributions in binary form must reproduce the above copyright
52 * notice, this list of conditions and the following disclaimer in
53 * the documentation and/or other materials provided with the
56 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
57 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
58 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
59 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
60 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
61 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
62 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
81 #include <sys/param.h>
82 #include <sys/types.h>
85 #include <sys/resource.h>
87 #include <sys/socket.h>
88 #include <netinet/in.h>
89 #include <arpa/inet.h>
94 #include "pppd-private.h"
100 #ifdef PPP_WITH_IPV6CP
108 #include "pathnames.h"
110 #include "multilink.h"
125 char ifname[IFNAMSIZ]; /* Interface name */
126 int ifunit; /* Interface unit number */
128 struct channel *the_channel;
130 char *progname; /* Name of this program */
131 char hostname[MAXNAMELEN]; /* Our hostname */
132 static char pidfilename[MAXPATHLEN]; /* name of pid file */
133 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
134 uid_t uid; /* Our real user-id */
135 struct notifier *pidchange = NULL;
136 struct notifier *phasechange = NULL;
137 struct notifier *exitnotify = NULL;
138 struct notifier *sigreceived = NULL;
139 struct notifier *fork_notifier = NULL;
141 int hungup; /* terminal has been hung up */
142 int privileged; /* we're running as real uid root */
143 int need_holdoff; /* need holdoff period before restarting */
144 int detached; /* have detached from terminal */
145 volatile int code; /* exit status for pppd */
146 int unsuccess; /* # unsuccessful connection attempts */
147 int do_callback; /* != 0 if we should do callback next */
148 int doing_callback; /* != 0 if we are doing callback */
149 int ppp_session_number; /* Session number, for channels with such a
150 concept (eg PPPoE) */
151 int childwait_done; /* have timed out waiting for children */
154 TDB_CONTEXT *pppdb; /* database for storing status etc. */
159 int (*holdoff_hook)(void) = NULL;
160 int (*new_phase_hook)(int) = NULL;
161 void (*snoop_recv_hook)(unsigned char *p, int len) = NULL;
162 void (*snoop_send_hook)(unsigned char *p, int len) = NULL;
164 static int conn_running; /* we have a [dis]connector running */
165 static int fd_loop; /* fd for getting demand-dial packets */
167 int fd_devnull; /* fd for /dev/null */
168 int devfd = -1; /* fd of underlying device */
169 int fd_ppp = -1; /* fd for talking PPP */
170 ppp_phase_t phase; /* where the link is at */
179 static sigset_t signals_handled;
181 static int sigpipe[2];
183 char **script_env; /* Env. variable values for scripts */
184 int s_env_nalloc; /* # words avail at script_env */
186 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
187 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
189 static int n_children; /* # child processes still running */
190 static int got_sigchld; /* set if we have received a SIGCHLD */
192 int privopen; /* don't lock, open device as root */
194 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
196 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
197 int ngroups; /* How many groups valid in groups */
199 static struct timeval start_time; /* Time when link was started. */
201 static struct pppd_stats old_link_stats;
202 struct pppd_stats link_stats;
203 unsigned link_connect_time;
204 int link_stats_valid;
205 int link_stats_print;
210 bool bundle_terminating;
213 * We maintain a list of child process pids and
214 * functions to call when they exit.
219 void (*done)(void *);
222 struct subprocess *next;
225 static struct subprocess *children;
227 /* Prototypes for procedures local to this file. */
229 static void setup_signals(void);
230 static void create_pidfile(int pid);
231 static void create_linkpidfile(int pid);
232 static void cleanup(void);
233 static void get_input(void);
234 static void calltimeout(void);
235 static struct timeval *timeleft(struct timeval *);
236 static void kill_my_pg(int);
237 static void hup(int);
238 static void term(int);
239 static void chld(int);
240 static void toggle_debug(int);
241 static void open_ccp(int);
242 static void bad_signal(int);
243 static void holdoff_end(void *);
244 static void forget_child(int pid, int status);
245 static int reap_kids(void);
246 static void childwait_end(void *);
247 static void run_net_script(char* script, int wait);
250 static void update_db_entry(void);
251 static void add_db_key(const char *);
252 static void delete_db_key(const char *);
253 static void cleanup_db(void);
256 static void handle_events(void);
257 void print_link_stats(void);
259 extern char *getlogin(void);
260 int main(int, char *[]);
262 const char *ppp_hostname()
267 bool ppp_signaled(int sig)
270 return !!got_sigterm;
272 return !!got_sigusr2;
278 ppp_exit_code_t ppp_status()
283 void ppp_set_status(ppp_exit_code_t value)
288 void ppp_set_session_number(int number)
290 ppp_session_number = number;
293 int ppp_get_session_number()
295 return ppp_session_number;
298 const char *ppp_ifname()
303 int ppp_get_ifname(char *buf, size_t bufsz)
306 return strlcpy(buf, ifname, bufsz);
311 void ppp_set_ifname(const char *name)
314 strlcpy(ifname, name, sizeof(ifname));
323 int ppp_get_link_uptime()
325 return link_connect_time;
329 * PPP Data Link Layer "protocol" table.
330 * One entry per supported protocol.
331 * The last entry must be NULL.
333 struct protent *protocols[] = {
341 #ifdef PPP_WITH_IPV6CP
354 main(int argc, char *argv[])
359 struct protent *protp;
362 strlcpy(path_upapfile, PPP_PATH_UPAPFILE, MAXPATHLEN);
363 strlcpy(path_chapfile, PPP_PATH_CHAPFILE, MAXPATHLEN);
365 strlcpy(path_net_init, PPP_PATH_NET_INIT, MAXPATHLEN);
366 strlcpy(path_net_preup, PPP_PATH_NET_PREUP, MAXPATHLEN);
367 strlcpy(path_net_down, PPP_PATH_NET_DOWN, MAXPATHLEN);
369 strlcpy(path_ipup, PPP_PATH_IPUP, MAXPATHLEN);
370 strlcpy(path_ipdown, PPP_PATH_IPDOWN, MAXPATHLEN);
371 strlcpy(path_ippreup, PPP_PATH_IPPREUP, MAXPATHLEN);
373 #ifdef PPP_WITH_IPV6CP
374 strlcpy(path_ipv6up, PPP_PATH_IPV6UP, MAXPATHLEN);
375 strlcpy(path_ipv6down, PPP_PATH_IPV6DOWN, MAXPATHLEN);
377 link_stats_valid = 0;
378 link_stats_print = 1;
379 new_phase(PHASE_INITIALIZE);
383 /* Initialize syslog facilities */
386 /* Initialize crypto libraries */
387 if (!PPP_crypto_init()) {
391 if (gethostname(hostname, sizeof(hostname)) < 0 ) {
392 ppp_option_error("Couldn't get hostname: %m");
395 hostname[MAXNAMELEN-1] = 0;
397 /* make sure we don't create world or group writable files. */
398 umask(umask(0777) | 022);
401 privileged = uid == 0;
402 slprintf(numbuf, sizeof(numbuf), "%d", uid);
403 ppp_script_setenv("ORIG_UID", numbuf, 0);
405 ngroups = getgroups(NGROUPS_MAX, groups);
408 * Initialize magic number generator now so that protocols may
409 * use magic numbers in initialization.
414 * Initialize each protocol.
416 for (i = 0; (protp = protocols[i]) != NULL; ++i)
420 * Initialize the default channel.
427 * Parse, in order, the system options file, the user's options file,
428 * and the command line arguments.
430 if (!ppp_options_from_file(PPP_PATH_SYSOPTIONS, !privileged, 0, 1)
431 || !options_from_user()
432 || !parse_args(argc-1, argv+1))
433 exit(EXIT_OPTION_ERROR);
434 devnam_fixed = 1; /* can no longer change device name */
437 * Work out the device name, if it hasn't already been specified,
438 * and parse the tty's options file.
440 if (the_channel->process_extra_options)
441 (*the_channel->process_extra_options)();
444 setlogmask(LOG_UPTO(LOG_DEBUG));
452 * Check that we are running as root.
454 if (geteuid() != 0) {
455 ppp_option_error("must be root to run %s, since it is not setuid-root",
460 if (!ppp_check_kernel_support()) {
461 ppp_option_error("%s", no_ppp_msg);
462 exit(EXIT_NO_KERNEL_SUPPORT);
466 * Check that the options given are valid and consistent.
469 if (!sys_check_options())
470 exit(EXIT_OPTION_ERROR);
471 auth_check_options();
473 for (i = 0; (protp = protocols[i]) != NULL; ++i)
474 if (protp->check_options != NULL)
475 (*protp->check_options)();
476 if (the_channel->check_options)
477 (*the_channel->check_options)();
480 if (dump_options || dryrun) {
481 init_pr_log(NULL, LOG_INFO);
482 print_options(pr_log, NULL);
489 /* Make sure fds 0, 1, 2 are open to somewhere. */
490 fd_devnull = open(PPP_DEVNULL, O_RDWR);
492 fatal("Couldn't open %s: %m", PPP_DEVNULL);
493 while (fd_devnull <= 2) {
496 fatal("Critical shortage of file descriptors: dup failed: %m");
501 * Initialize system-dependent stuff.
506 pppdb = tdb_open(PPP_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
508 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
511 warn("Warning: couldn't open ppp database %s", PPP_PATH_PPPDB);
513 warn("Warning: disabling multilink");
520 * Detach ourselves from the terminal, if required,
521 * and identify who is running us.
523 if (!nodetach && !updetach)
528 if (pw != NULL && pw->pw_name != NULL)
533 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
534 ppp_script_setenv("PPPLOGNAME", p, 0);
537 ppp_script_setenv("DEVICE", devnam, 1);
538 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
539 ppp_script_setenv("PPPD_PID", numbuf, 1);
543 create_linkpidfile(getpid());
548 * If we're doing dial-on-demand, set up the interface now.
552 * Open the loopback channel and set it up to be the ppp interface.
554 fd_loop = open_ppp_loopback();
557 * Configure the interface and mark it up, etc.
566 bundle_terminating = 0;
572 doing_callback = do_callback;
575 if (demand && !doing_callback) {
577 * Don't do anything until we see some activity.
579 new_phase(PHASE_DORMANT);
586 if (get_loop_output())
594 * Now we want to bring up the link.
597 info("Starting link");
600 ppp_get_time(&start_time);
601 ppp_script_unsetenv("CONNECT_TIME");
602 ppp_script_unsetenv("BYTES_SENT");
603 ppp_script_unsetenv("BYTES_RCVD");
605 lcp_open(0); /* Start protocol */
607 while (phase != PHASE_DEAD) {
611 lcp_close(0, "User request");
615 bundle_terminating = 1;
616 if (phase == PHASE_MASTER)
617 mp_bundle_terminated();
620 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
621 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
622 (*ccp_protent.open)(0);
626 /* restore FSMs to original state */
629 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
634 t = need_holdoff? holdoff: 0;
636 t = (*holdoff_hook)();
638 new_phase(PHASE_HOLDOFF);
639 TIMEOUT(holdoff_end, NULL, t);
643 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
644 } while (phase == PHASE_HOLDOFF);
650 /* Wait for scripts to finish */
652 if (n_children > 0) {
654 TIMEOUT(childwait_end, NULL, child_wait);
656 struct subprocess *chp;
657 dbglog("Waiting for %d child processes...", n_children);
658 for (chp = children; chp != NULL; chp = chp->next)
659 dbglog(" script %s, pid %d", chp->prog, chp->pid);
661 while (n_children > 0 && !childwait_done) {
663 if (kill_link && !childwait_done)
674 * handle_events - wait for something to happen and respond to it.
680 unsigned char buf[16];
682 kill_link = open_ccp_flag = 0;
684 /* alert via signal pipe */
686 /* flush signal pipe */
687 for (; read(sigpipe[0], buf, sizeof(buf)) > 0; );
689 /* wait if necessary */
690 if (!(got_sighup || got_sigterm || got_sigusr2 || got_sigchld))
691 wait_input(timeleft(&timo));
693 remove_fd(sigpipe[0]);
697 info("Hangup (SIGHUP)");
700 if (code != EXIT_HANGUP)
701 code = EXIT_USER_REQUEST;
704 info("Terminating on signal %d", got_sigterm);
708 code = EXIT_USER_REQUEST;
713 reap_kids(); /* Don't leave dead kids lying around */
722 * setup_signals - initialize signal handling.
729 /* create pipe to wake up event handler from signal handler */
730 if (pipe(sigpipe) < 0)
731 fatal("Couldn't create signal pipe: %m");
732 fcntl(sigpipe[0], F_SETFD, fcntl(sigpipe[0], F_GETFD) | FD_CLOEXEC);
733 fcntl(sigpipe[1], F_SETFD, fcntl(sigpipe[1], F_GETFD) | FD_CLOEXEC);
734 fcntl(sigpipe[0], F_SETFL, fcntl(sigpipe[0], F_GETFL) | O_NONBLOCK);
735 fcntl(sigpipe[1], F_SETFL, fcntl(sigpipe[1], F_GETFL) | O_NONBLOCK);
738 * Compute mask of all interesting signals and install signal handlers
739 * for each. Only one signal handler may be active at a time. Therefore,
740 * all other signals should be masked when any handler is executing.
742 sigemptyset(&signals_handled);
743 sigaddset(&signals_handled, SIGHUP);
744 sigaddset(&signals_handled, SIGINT);
745 sigaddset(&signals_handled, SIGTERM);
746 sigaddset(&signals_handled, SIGCHLD);
747 sigaddset(&signals_handled, SIGUSR2);
749 #define SIGNAL(s, handler) do { \
750 sa.sa_handler = handler; \
751 if (sigaction(s, &sa, NULL) < 0) \
752 fatal("Couldn't establish signal handler (%d): %m", s); \
755 sa.sa_mask = signals_handled;
757 SIGNAL(SIGHUP, hup); /* Hangup */
758 SIGNAL(SIGINT, term); /* Interrupt */
759 SIGNAL(SIGTERM, term); /* Terminate */
760 SIGNAL(SIGCHLD, chld);
762 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
763 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
766 * Install a handler for other signals which would otherwise
767 * cause pppd to exit without cleaning up.
769 SIGNAL(SIGABRT, bad_signal);
770 SIGNAL(SIGALRM, bad_signal);
771 SIGNAL(SIGFPE, bad_signal);
772 SIGNAL(SIGILL, bad_signal);
773 SIGNAL(SIGPIPE, bad_signal);
774 SIGNAL(SIGQUIT, bad_signal);
775 SIGNAL(SIGSEGV, bad_signal);
777 SIGNAL(SIGBUS, bad_signal);
780 SIGNAL(SIGEMT, bad_signal);
783 SIGNAL(SIGPOLL, bad_signal);
786 SIGNAL(SIGPROF, bad_signal);
789 SIGNAL(SIGSYS, bad_signal);
792 SIGNAL(SIGTRAP, bad_signal);
795 SIGNAL(SIGVTALRM, bad_signal);
798 SIGNAL(SIGXCPU, bad_signal);
801 SIGNAL(SIGXFSZ, bad_signal);
805 * Apparently we can get a SIGPIPE when we call syslog, if
806 * syslogd has died and been restarted. Ignoring it seems
809 signal(SIGPIPE, SIG_IGN);
813 * net-* scripts to be run come through here.
815 void run_net_script(char* script, int wait)
820 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
829 run_program(script, argv, 0, NULL, NULL, wait);
833 * set_ifunit - do things we need to do once we know which ppp
837 set_ifunit(int iskey)
841 if (req_ifname[0] != '\0')
842 slprintf(ifname, sizeof(ifname), "%s", req_ifname);
844 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
845 info("Using interface %s", ifname);
846 ppp_script_setenv("IFNAME", ifname, iskey);
847 slprintf(ifkey, sizeof(ifkey), "%d", ifunit);
848 ppp_script_setenv("UNIT", ifkey, iskey);
850 create_pidfile(getpid()); /* write pid to file */
851 create_linkpidfile(getpid());
854 ppp_script_setenv("REMOTENUMBER", remote_number, 0);
855 run_net_script(path_net_init, 1);
859 * detach - detach us from the controlling terminal.
871 if (pipe(pipefd) == -1)
872 pipefd[0] = pipefd[1] = -1;
873 if ((pid = fork()) < 0) {
874 error("Couldn't detach (fork failed: %m)");
875 die(1); /* or just return? */
879 notify(pidchange, pid);
880 /* update pid files if they have been written already */
883 create_linkpidfile(pid);
884 exit(0); /* parent dies */
889 fatal("Could not change directory to '/', %m");
897 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
898 ppp_script_setenv("PPPD_PID", numbuf, 1);
900 /* wait for parent to finish updating pid & lock files and die */
902 complete_read(pipefd[0], numbuf, 1);
907 * reopen_log - (re)open our connection to syslog.
912 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
913 setlogmask(LOG_UPTO(LOG_INFO));
917 * Create a file containing our process ID.
920 create_pidfile(int pid)
924 mkdir_recursive(PPP_PATH_VARRUN);
925 slprintf(pidfilename, sizeof(pidfilename), "%s/%s.pid",
926 PPP_PATH_VARRUN, ifname);
927 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
928 fprintf(pidfile, "%d\n", pid);
929 (void) fclose(pidfile);
931 error("Failed to create pid file %s: %m", pidfilename);
937 create_linkpidfile(int pid)
941 if (linkname[0] == 0)
943 ppp_script_setenv("LINKNAME", linkname, 1);
944 slprintf(linkpidfile, sizeof(linkpidfile), "%s/ppp-%s.pid",
945 PPP_PATH_VARRUN, linkname);
946 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
947 fprintf(pidfile, "%d\n", pid);
949 fprintf(pidfile, "%s\n", ifname);
950 (void) fclose(pidfile);
952 error("Failed to create pid file %s: %m", linkpidfile);
958 * remove_pidfile - remove our pid files
960 void remove_pidfiles(void)
962 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
963 warn("unable to delete pid file %s: %m", pidfilename);
965 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
966 warn("unable to delete pid file %s: %m", linkpidfile);
971 * holdoff_end - called via a timeout when the holdoff period ends.
974 holdoff_end(void *arg)
976 new_phase(PHASE_DORMANT);
979 /* List of protocol names, to make our messages a little more informative. */
980 struct protocol_list {
983 } protocol_list[] = {
985 { 0x23, "OSI Network Layer" },
986 { 0x25, "Xerox NS IDP" },
987 { 0x27, "DECnet Phase IV" },
988 { 0x29, "Appletalk" },
989 { 0x2b, "Novell IPX" },
990 { 0x2d, "VJ compressed TCP/IP" },
991 { 0x2f, "VJ uncompressed TCP/IP" },
992 { 0x31, "Bridging PDU" },
993 { 0x33, "Stream Protocol ST-II" },
994 { 0x35, "Banyan Vines" },
995 { 0x39, "AppleTalk EDDP" },
996 { 0x3b, "AppleTalk SmartBuffered" },
997 { 0x3d, "Multi-Link" },
998 { 0x3f, "NETBIOS Framing" },
999 { 0x41, "Cisco Systems" },
1000 { 0x43, "Ascom Timeplex" },
1001 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1002 { 0x47, "DCA Remote Lan" },
1003 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1004 { 0x4b, "SNA over 802.2" },
1006 { 0x4f, "IP6 Header Compression" },
1007 { 0x51, "KNX Bridging Data" },
1008 { 0x53, "Encryption" },
1009 { 0x55, "Individual Link Encryption" },
1011 { 0x59, "PPP Muxing" },
1012 { 0x5b, "Vendor-Specific Network Protocol" },
1013 { 0x61, "RTP IPHC Full Header" },
1014 { 0x63, "RTP IPHC Compressed TCP" },
1015 { 0x65, "RTP IPHC Compressed non-TCP" },
1016 { 0x67, "RTP IPHC Compressed UDP 8" },
1017 { 0x69, "RTP IPHC Compressed RTP 8" },
1018 { 0x6f, "Stampede Bridging" },
1020 { 0xc1, "NTCITS IPI" },
1021 { 0xfb, "single-link compression" },
1022 { 0xfd, "Compressed Datagram" },
1023 { 0x0201, "802.1d Hello Packets" },
1024 { 0x0203, "IBM Source Routing BPDU" },
1025 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1026 { 0x0207, "Cisco Discovery Protocol" },
1027 { 0x0209, "Netcs Twin Routing" },
1028 { 0x020b, "STP - Scheduled Transfer Protocol" },
1029 { 0x020d, "EDP - Extreme Discovery Protocol" },
1030 { 0x0211, "Optical Supervisory Channel Protocol" },
1031 { 0x0213, "Optical Supervisory Channel Protocol" },
1032 { 0x0231, "Luxcom" },
1033 { 0x0233, "Sigma Network Systems" },
1034 { 0x0235, "Apple Client Server Protocol" },
1035 { 0x0281, "MPLS Unicast" },
1036 { 0x0283, "MPLS Multicast" },
1037 { 0x0285, "IEEE p1284.4 standard - data packets" },
1038 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
1039 { 0x0289, "Multichannel Flow Treatment Protocol" },
1040 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
1041 { 0x2065, "RTP IPHC Context State" },
1042 { 0x2067, "RTP IPHC Compressed UDP 16" },
1043 { 0x2069, "RTP IPHC Compressed RTP 16" },
1044 { 0x4001, "Cray Communications Control Protocol" },
1045 { 0x4003, "CDPD Mobile Network Registration Protocol" },
1046 { 0x4005, "Expand accelerator protocol" },
1047 { 0x4007, "ODSICP NCP" },
1048 { 0x4009, "DOCSIS DLL" },
1049 { 0x400B, "Cetacean Network Detection Protocol" },
1050 { 0x4021, "Stacker LZS" },
1051 { 0x4023, "RefTek Protocol" },
1052 { 0x4025, "Fibre Channel" },
1053 { 0x4027, "EMIT Protocols" },
1054 { 0x405b, "Vendor-Specific Protocol (VSP)" },
1055 { 0x8021, "Internet Protocol Control Protocol" },
1056 { 0x8023, "OSI Network Layer Control Protocol" },
1057 { 0x8025, "Xerox NS IDP Control Protocol" },
1058 { 0x8027, "DECnet Phase IV Control Protocol" },
1059 { 0x8029, "Appletalk Control Protocol" },
1060 { 0x802b, "Novell IPX Control Protocol" },
1061 { 0x8031, "Bridging NCP" },
1062 { 0x8033, "Stream Protocol Control Protocol" },
1063 { 0x8035, "Banyan Vines Control Protocol" },
1064 { 0x803d, "Multi-Link Control Protocol" },
1065 { 0x803f, "NETBIOS Framing Control Protocol" },
1066 { 0x8041, "Cisco Systems Control Protocol" },
1067 { 0x8043, "Ascom Timeplex" },
1068 { 0x8045, "Fujitsu LBLB Control Protocol" },
1069 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1070 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1071 { 0x804b, "SNA over 802.2 Control Protocol" },
1072 { 0x804d, "SNA Control Protocol" },
1073 { 0x804f, "IP6 Header Compression Control Protocol" },
1074 { 0x8051, "KNX Bridging Control Protocol" },
1075 { 0x8053, "Encryption Control Protocol" },
1076 { 0x8055, "Individual Link Encryption Control Protocol" },
1077 { 0x8057, "IPv6 Control Protocol" },
1078 { 0x8059, "PPP Muxing Control Protocol" },
1079 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
1080 { 0x806f, "Stampede Bridging Control Protocol" },
1081 { 0x8073, "MP+ Control Protocol" },
1082 { 0x80c1, "NTCITS IPI Control Protocol" },
1083 { 0x80fb, "Single Link Compression Control Protocol" },
1084 { 0x80fd, "Compression Control Protocol" },
1085 { 0x8207, "Cisco Discovery Protocol Control" },
1086 { 0x8209, "Netcs Twin Routing" },
1087 { 0x820b, "STP - Control Protocol" },
1088 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
1089 { 0x8235, "Apple Client Server Protocol Control" },
1090 { 0x8281, "MPLSCP" },
1091 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
1092 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1093 { 0x8289, "Multichannel Flow Treatment Protocol" },
1094 { 0xc021, "Link Control Protocol" },
1095 { 0xc023, "Password Authentication Protocol" },
1096 { 0xc025, "Link Quality Report" },
1097 { 0xc027, "Shiva Password Authentication Protocol" },
1098 { 0xc029, "CallBack Control Protocol (CBCP)" },
1099 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
1101 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
1102 { 0xc081, "Container Control Protocol" },
1103 { 0xc223, "Challenge Handshake Authentication Protocol" },
1104 { 0xc225, "RSA Authentication Protocol" },
1105 { 0xc227, "Extensible Authentication Protocol" },
1106 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1107 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1108 { 0xc281, "Proprietary Authentication Protocol" },
1109 { 0xc283, "Proprietary Authentication Protocol" },
1110 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1115 * protocol_name - find a name for a PPP protocol.
1118 protocol_name(int proto)
1120 struct protocol_list *lp;
1122 for (lp = protocol_list; lp->proto != 0; ++lp)
1123 if (proto == lp->proto)
1129 * get_input - called when incoming data is available.
1137 struct protent *protp;
1139 p = inpacket_buf; /* point to beginning of packet buffer */
1141 len = read_packet(inpacket_buf);
1146 if (bundle_eof && mp_master()) {
1147 notice("Last channel has disconnected");
1148 mp_bundle_terminated();
1151 notice("Modem hangup");
1155 lcp_lowerdown(0); /* serial link is no longer available */
1160 if (len < PPP_HDRLEN) {
1161 dbglog("received short packet:%.*B", len, p);
1165 dump_packet("rcvd", p, len);
1166 if (snoop_recv_hook) snoop_recv_hook(p, len);
1168 p += 2; /* Skip address and control */
1169 GETSHORT(protocol, p);
1173 * Toss all non-LCP packets unless LCP is OPEN.
1175 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1176 dbglog("Discarded non-LCP packet when LCP not open");
1181 * Until we get past the authentication phase, toss all packets
1182 * except LCP, LQR and authentication packets.
1184 if (phase <= PHASE_AUTHENTICATE
1185 && !(protocol == PPP_LCP || protocol == PPP_LQR
1186 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1187 protocol == PPP_EAP)) {
1188 dbglog("discarding proto 0x%x in phase %d",
1194 * Upcall the proper protocol input routine.
1196 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1197 if (protp->protocol == protocol && protp->enabled_flag) {
1198 (*protp->input)(0, p, len);
1201 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1202 && protp->datainput != NULL) {
1203 (*protp->datainput)(0, p, len);
1209 const char *pname = protocol_name(protocol);
1211 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1213 warn("Unsupported protocol 0x%x received", protocol);
1215 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1219 * ppp_send_config - configure the transmit-side characteristics of
1220 * the ppp interface. Returns -1, indicating an error, if the channel
1221 * send_config procedure called error() (or incremented error_count
1222 * itself), otherwise 0.
1225 ppp_send_config(int unit, int mtu, u_int32_t accm, int pcomp, int accomp)
1229 if (the_channel->send_config == NULL)
1232 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1233 return (error_count != errs)? -1: 0;
1237 * ppp_recv_config - configure the receive-side characteristics of
1238 * the ppp interface. Returns -1, indicating an error, if the channel
1239 * recv_config procedure called error() (or incremented error_count
1240 * itself), otherwise 0.
1243 ppp_recv_config(int unit, int mru, u_int32_t accm, int pcomp, int accomp)
1247 if (the_channel->recv_config == NULL)
1250 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1251 return (error_count != errs)? -1: 0;
1255 * new_phase - signal the start of a new phase of pppd's operation.
1258 new_phase(ppp_phase_t p)
1262 if (phase <= PHASE_NETWORK) {
1263 char iftmpname[IFNAMSIZ];
1264 int ifindex = if_nametoindex(ifname);
1265 run_net_script(path_net_preup, 1);
1266 if (if_indextoname(ifindex, iftmpname) && strcmp(iftmpname, ifname)) {
1267 info("Detected interface name change from %s to %s.", ifname, iftmpname);
1268 strcpy(ifname, iftmpname);
1272 case PHASE_DISCONNECT:
1273 run_net_script(path_net_down, 0);
1279 (*new_phase_hook)(p);
1280 notify(phasechange, p);
1284 in_phase(ppp_phase_t p)
1286 return (phase == p);
1290 * die - clean up state and exit with the specified status.
1296 if (!mp_on() || mp_master())
1299 notify(exitnotify, status);
1300 syslog(LOG_INFO, "Exit.");
1305 * cleanup - restore anything which needs to be restored before we exit
1314 the_channel->disestablish_ppp(devfd);
1315 if (the_channel->cleanup)
1316 (*the_channel->cleanup)();
1327 print_link_stats(void)
1330 * Print connect time and statistics.
1332 if (link_stats_print && link_stats_valid) {
1333 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1334 info("Connect time %d.%d minutes.", t/10, t%10);
1335 info("Sent %llu bytes, received %llu bytes.",
1336 link_stats.bytes_out, link_stats.bytes_in);
1337 link_stats_print = 0;
1342 * reset_link_stats - "reset" stats when link goes up.
1345 reset_link_stats(int u)
1347 get_ppp_stats(u, &old_link_stats);
1348 ppp_get_time(&start_time);
1349 link_stats_print = 1;
1353 * update_link_stats - get stats at link termination.
1356 update_link_stats(int u)
1361 if (!get_ppp_stats(u, &link_stats)
1362 || ppp_get_time(&now) < 0)
1364 link_connect_time = now.tv_sec - start_time.tv_sec;
1365 link_stats_valid = 1;
1367 link_stats.bytes_in -= old_link_stats.bytes_in;
1368 link_stats.bytes_out -= old_link_stats.bytes_out;
1369 link_stats.pkts_in -= old_link_stats.pkts_in;
1370 link_stats.pkts_out -= old_link_stats.pkts_out;
1372 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1373 ppp_script_setenv("CONNECT_TIME", numbuf, 0);
1374 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_out);
1375 ppp_script_setenv("BYTES_SENT", numbuf, 0);
1376 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_in);
1377 ppp_script_setenv("BYTES_RCVD", numbuf, 0);
1381 ppp_get_link_stats(ppp_link_stats_st *stats)
1383 update_link_stats(0);
1384 if (stats != NULL &&
1387 memcpy(stats, &link_stats, sizeof(*stats));
1395 struct timeval c_time; /* time at which to call routine */
1396 void *c_arg; /* argument to routine */
1397 void (*c_func)(void *); /* routine */
1398 struct callout *c_next;
1401 static struct callout *callout = NULL; /* Callout list */
1402 static struct timeval timenow; /* Current time */
1405 * timeout - Schedule a timeout.
1408 ppp_timeout(void (*func)(void *), void *arg, int secs, int usecs)
1410 struct callout *newp, *p, **pp;
1415 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1416 fatal("Out of memory in timeout()!");
1418 newp->c_func = func;
1419 ppp_get_time(&timenow);
1420 newp->c_time.tv_sec = timenow.tv_sec + secs;
1421 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1422 if (newp->c_time.tv_usec >= 1000000) {
1423 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1424 newp->c_time.tv_usec %= 1000000;
1428 * Find correct place and link it in.
1430 for (pp = &callout; (p = *pp); pp = &p->c_next)
1431 if (newp->c_time.tv_sec < p->c_time.tv_sec
1432 || (newp->c_time.tv_sec == p->c_time.tv_sec
1433 && newp->c_time.tv_usec < p->c_time.tv_usec))
1441 * untimeout - Unschedule a timeout.
1444 ppp_untimeout(void (*func)(void *), void *arg)
1446 struct callout **copp, *freep;
1449 * Find first matching timeout and remove it from the list.
1451 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1452 if (freep->c_func == func && freep->c_arg == arg) {
1453 *copp = freep->c_next;
1454 free((char *) freep);
1461 * calltimeout - Call any timeout routines which are now due.
1468 while (callout != NULL) {
1471 if (ppp_get_time(&timenow) < 0)
1472 fatal("Failed to get time of day: %m");
1473 if (!(p->c_time.tv_sec < timenow.tv_sec
1474 || (p->c_time.tv_sec == timenow.tv_sec
1475 && p->c_time.tv_usec <= timenow.tv_usec)))
1476 break; /* no, it's not time yet */
1478 callout = p->c_next;
1479 (*p->c_func)(p->c_arg);
1487 * timeleft - return the length of time until the next timeout is due.
1489 static struct timeval *
1490 timeleft(struct timeval *tvp)
1492 if (callout == NULL)
1495 ppp_get_time(&timenow);
1496 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1497 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1498 if (tvp->tv_usec < 0) {
1499 tvp->tv_usec += 1000000;
1502 if (tvp->tv_sec < 0)
1503 tvp->tv_sec = tvp->tv_usec = 0;
1510 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1511 * We assume that sig is currently blocked.
1516 struct sigaction act, oldact;
1517 struct subprocess *chp;
1521 * There might be other things in our process group that we
1522 * didn't start that would get hit if we did a kill(0), so
1523 * just send the signal individually to our children.
1525 for (chp = children; chp != NULL; chp = chp->next)
1527 kill(chp->pid, sig);
1531 /* We've done a setsid(), so we can just use a kill(0) */
1532 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1533 act.sa_handler = SIG_IGN;
1537 * The kill() above made the signal pending for us, as well as
1538 * the rest of our process group, but we don't want it delivered
1539 * to us. It is blocked at the moment. Setting it to be ignored
1540 * will cause the pending signal to be discarded. If we did the
1541 * kill() after setting the signal to be ignored, it is unspecified
1542 * (by POSIX) whether the signal is immediately discarded or left
1543 * pending, and in fact Linux would leave it pending, and so it
1544 * would be delivered after the current signal handler exits,
1545 * leading to an infinite loop.
1547 sigaction(sig, &act, &oldact);
1548 sigaction(sig, &oldact, NULL);
1553 * hup - Catch SIGHUP signal.
1555 * Indicates that the physical layer has been disconnected.
1556 * We don't rely on this indication; if the user has sent this
1557 * signal, we just take the link down.
1562 /* can't log a message here, it can deadlock */
1565 /* Send the signal to the [dis]connector process(es) also */
1567 notify(sigreceived, sig);
1569 #pragma GCC diagnostic push
1570 #pragma GCC diagnostic ignored "-Wunused-result"
1571 write(sigpipe[1], &sig, sizeof(sig));
1572 #pragma GCC diagnostic pop
1578 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1580 * Indicates that we should initiate a graceful disconnect and exit.
1586 /* can't log a message here, it can deadlock */
1589 /* Send the signal to the [dis]connector process(es) also */
1591 notify(sigreceived, sig);
1593 #pragma GCC diagnostic push
1594 #pragma GCC diagnostic ignored "-Wunused-result"
1595 write(sigpipe[1], &sig, sizeof(sig));
1596 #pragma GCC diagnostic pop
1602 * chld - Catch SIGCHLD signal.
1603 * Sets a flag so we will call reap_kids in the mainline.
1610 #pragma GCC diagnostic push
1611 #pragma GCC diagnostic ignored "-Wunused-result"
1612 write(sigpipe[1], &sig, sizeof(sig));
1613 #pragma GCC diagnostic pop
1619 * toggle_debug - Catch SIGUSR1 signal.
1621 * Toggle debug flag.
1625 toggle_debug(int sig)
1629 setlogmask(LOG_UPTO(LOG_DEBUG));
1631 setlogmask(LOG_UPTO(LOG_WARNING));
1637 * open_ccp - Catch SIGUSR2 signal.
1639 * Try to (re)negotiate compression.
1647 #pragma GCC diagnostic push
1648 #pragma GCC diagnostic ignored "-Wunused-result"
1649 write(sigpipe[1], &sig, sizeof(sig));
1650 #pragma GCC diagnostic pop
1656 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1661 static int crashed = 0;
1666 error("Fatal signal %d", sig);
1668 kill_my_pg(SIGTERM);
1669 notify(sigreceived, sig);
1674 * ppp_safe_fork - Create a child process. The child closes all the
1675 * file descriptors that we don't want to leak to a script.
1676 * The parent waits for the child to do this before returning.
1677 * This also arranges for the specified fds to be dup'd to
1678 * fds 0, 1, 2 in the child.
1681 ppp_safe_fork(int infd, int outfd, int errfd)
1687 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1688 while ((fd = dup(fd_devnull)) >= 0) {
1695 if (pipe(pipefd) == -1)
1696 pipefd[0] = pipefd[1] = -1;
1699 error("fork failed: %m");
1705 /* this read() blocks until the close(pipefd[1]) below */
1706 complete_read(pipefd[0], buf, 1);
1711 /* Executing in the child */
1718 /* make sure infd, outfd and errfd won't get tromped on below */
1719 if (infd == 1 || infd == 2)
1721 if (outfd == 0 || outfd == 2)
1723 if (errfd == 0 || errfd == 1)
1728 /* dup the in, out, err fds to 0, 1, 2 */
1738 if (the_channel->close)
1739 (*the_channel->close)();
1741 close(devfd); /* some plugins don't have a close function */
1751 notify(fork_notifier, 0);
1753 /* this close unblocks the read() call above in the parent */
1760 add_script_env(int pos, char *newstring)
1762 if (pos + 1 >= s_env_nalloc) {
1763 int new_n = pos + 17;
1764 char **newenv = realloc(script_env, new_n * sizeof(char *));
1765 if (newenv == NULL) {
1766 free(newstring - 1);
1769 script_env = newenv;
1770 s_env_nalloc = new_n;
1772 script_env[pos] = newstring;
1773 script_env[pos + 1] = NULL;
1778 remove_script_env(int pos)
1780 free(script_env[pos] - 1);
1781 while ((script_env[pos] = script_env[pos + 1]) != NULL)
1786 * update_system_environment - process the list of set/unset options
1787 * and update the system environment.
1790 update_system_environment(void)
1792 struct userenv *uep;
1794 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1796 setenv(uep->ue_name, uep->ue_value, 1);
1798 unsetenv(uep->ue_name);
1803 * device_script - run a program to talk to the specified fds
1804 * (e.g. to run the connector or disconnector script).
1805 * stderr gets connected to the log fd or to the PPP_PATH_CONNERRS file.
1808 device_script(char *program, int in, int out, int dont_wait)
1818 errfd = open(PPP_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1821 pid = ppp_safe_fork(in, out, errfd);
1823 if (pid != 0 && log_to_fd < 0)
1828 error("Failed to create child process: %m");
1833 record_child(pid, program, NULL, NULL, 1);
1836 while (waitpid(pid, &status, 0) < 0) {
1839 fatal("error waiting for (dis)connection process: %m");
1841 forget_child(pid, status);
1844 return (status == 0 ? 0 : -1);
1847 /* here we are executing in the child */
1848 ret = setgid(getgid());
1850 perror("pppd: setgid failed\n");
1854 if (ret != 0 || getuid() != uid) {
1855 perror("pppd: setuid failed\n");
1858 update_system_environment();
1859 execl("/bin/sh", "sh", "-c", program, (char *)0);
1860 perror("pppd: could not exec /bin/sh");
1867 * update_script_environment - process the list of set/unset options
1868 * and update the script environment. Note that we intentionally do
1869 * not update the TDB. These changes are layered on top right before
1870 * exec. It is not possible to use script_setenv() or
1871 * ppp_script_unsetenv() safely after this routine is run.
1874 update_script_environment(void)
1876 struct userenv *uep;
1878 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1880 char *p, *newstring;
1881 int nlen = strlen(uep->ue_name);
1883 for (i = 0; (p = script_env[i]) != NULL; i++) {
1884 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=')
1887 if (uep->ue_isset) {
1888 nlen += strlen(uep->ue_value) + 2;
1889 newstring = malloc(nlen + 1);
1890 if (newstring == NULL)
1893 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value);
1895 script_env[i] = newstring;
1897 add_script_env(i, newstring);
1898 } else if (p != NULL) {
1899 remove_script_env(i);
1905 * run_program - execute a program with given arguments,
1906 * but don't wait for it unless wait is non-zero.
1907 * If the program can't be executed, logs an error unless
1908 * must_exist is 0 and the program file doesn't exist.
1909 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1910 * or isn't an executable plain file, or the process ID of the child.
1911 * If done != NULL, (*done)(arg) will be called later (within
1912 * reap_kids) iff the return value is > 0.
1915 run_program(char *prog, char * const *args, int must_exist, void (*done)(void *), void *arg, int wait)
1917 int pid, status, ret;
1921 * First check if the file exists and is executable.
1922 * We don't use access() because that would use the
1923 * real user-id, which might not be root, and the script
1924 * might be accessible only to root.
1927 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1928 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1929 if (must_exist || errno != ENOENT)
1930 warn("Can't execute %s: %m", prog);
1934 pid = ppp_safe_fork(fd_devnull, fd_devnull, fd_devnull);
1936 error("Failed to create child process for %s: %m", prog);
1941 dbglog("Script %s started (pid %d)", prog, pid);
1942 record_child(pid, prog, done, arg, 0);
1944 while (waitpid(pid, &status, 0) < 0) {
1947 fatal("error waiting for script %s: %m", prog);
1949 forget_child(pid, status);
1954 /* Leave the current location */
1955 (void) setsid(); /* No controlling tty. */
1956 (void) umask (S_IRWXG|S_IRWXO);
1957 ret = chdir ("/"); /* no current directory. */
1959 fatal("Failed to change directory to '/', %m");
1961 ret = setuid(0); /* set real UID = root */
1963 fatal("Failed to set uid, %m");
1965 ret = setgid(getegid());
1967 fatal("failed to set gid, %m");
1971 /* Force the priority back to zero if pppd is running higher. */
1972 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1973 warn("can't reset priority to 0: %m");
1976 /* run the program */
1977 update_script_environment();
1978 execve(prog, args, script_env);
1979 if (must_exist || errno != ENOENT) {
1980 /* have to reopen the log, there's nowhere else
1981 for the message to go. */
1983 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1991 * record_child - add a child process to the list for reap_kids
1995 record_child(int pid, char *prog, void (*done)(void *), void *arg, int killable)
1997 struct subprocess *chp;
2001 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
2003 warn("losing track of %s process", prog);
2009 chp->next = children;
2010 chp->killable = killable;
2016 * childwait_end - we got fed up waiting for the child processes to
2017 * exit, send them all a SIGTERM.
2020 childwait_end(void *arg)
2022 struct subprocess *chp;
2024 for (chp = children; chp != NULL; chp = chp->next) {
2026 dbglog("sending SIGTERM to process %d", chp->pid);
2027 kill(chp->pid, SIGTERM);
2033 * forget_child - clean up after a dead child
2036 forget_child(int pid, int status)
2038 struct subprocess *chp, **prevp;
2040 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
2041 if (chp->pid == pid) {
2047 if (WIFSIGNALED(status)) {
2048 warn("Child process %s (pid %d) terminated with signal %d",
2049 (chp? chp->prog: "??"), pid, WTERMSIG(status));
2051 dbglog("Script %s finished (pid %d), status = 0x%x",
2052 (chp? chp->prog: "??"), pid,
2053 WIFEXITED(status) ? WEXITSTATUS(status) : status);
2054 if (chp && chp->done)
2055 (*chp->done)(chp->arg);
2061 * reap_kids - get status from any dead child processes,
2062 * and log a message for abnormal terminations.
2069 if (n_children == 0)
2071 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
2072 forget_child(pid, status);
2075 if (errno == ECHILD)
2078 error("Error waiting for child process: %m");
2084 struct notifier **get_notifier_by_type(ppp_notify_t type)
2086 struct notifier **list[NF_MAX_NOTIFY] = {
2087 [NF_PID_CHANGE ] = &pidchange,
2088 [NF_PHASE_CHANGE] = &phasechange,
2089 [NF_EXIT ] = &exitnotify,
2090 [NF_SIGNALED ] = &sigreceived,
2091 [NF_IP_UP ] = &ip_up_notifier,
2092 [NF_IP_DOWN ] = &ip_down_notifier,
2093 #ifdef PPP_WITH_IPV6CP
2094 [NF_IPV6_UP ] = &ipv6_up_notifier,
2095 [NF_IPV6_DOWN ] = &ipv6_down_notifier,
2097 [NF_AUTH_UP ] = &auth_up_notifier,
2098 [NF_LINK_DOWN ] = &link_down_notifier,
2099 [NF_FORK ] = &fork_notifier,
2105 * add_notifier - add a new function to be called when something happens.
2108 ppp_add_notify(ppp_notify_t type, ppp_notify_fn *func, void *arg)
2110 struct notifier **notif = get_notifier_by_type(type);
2113 struct notifier *np = malloc(sizeof(struct notifier));
2115 novm("notifier struct");
2121 error("Could not find notifier function for: %d", type);
2126 * remove_notifier - remove a function from the list of things to
2127 * be called when something happens.
2130 ppp_del_notify(ppp_notify_t type, ppp_notify_fn *func, void *arg)
2132 struct notifier **notif = get_notifier_by_type(type);
2134 struct notifier *np;
2136 for (; (np = *notif) != 0; notif = &np->next) {
2137 if (np->func == func && np->arg == arg) {
2144 error("Could not find notifier function for: %d", type);
2149 * notify - call a set of functions registered with add_notifier.
2152 notify(struct notifier *notif, int val)
2154 struct notifier *np;
2156 while ((np = notif) != 0) {
2158 (*np->func)(np->arg, val);
2163 * novm - log an error message saying we ran out of memory, and die.
2166 novm(const char *msg)
2168 fatal("Virtual memory exhausted allocating %s\n", msg);
2172 * ppp_script_setenv - set an environment variable value to be used
2173 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2176 ppp_script_setenv(char *var, char *value, int iskey)
2178 size_t varl = strlen(var);
2179 size_t vl = varl + strlen(value) + 2;
2181 char *p, *newstring;
2183 newstring = (char *) malloc(vl+1);
2186 *newstring++ = iskey;
2187 slprintf(newstring, vl, "%s=%s", var, value);
2189 /* check if this variable is already set */
2190 if (script_env != 0) {
2191 for (i = 0; (p = script_env[i]) != 0; ++i) {
2192 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2194 if (p[-1] && pppdb != NULL)
2198 script_env[i] = newstring;
2200 if (pppdb != NULL) {
2202 add_db_key(newstring);
2210 /* no space allocated for script env. ptrs. yet */
2212 script_env = malloc(16 * sizeof(char *));
2213 if (script_env == 0) {
2214 free(newstring - 1);
2220 if (!add_script_env(i, newstring))
2224 if (pppdb != NULL) {
2226 add_db_key(newstring);
2233 * ppp_script_unsetenv - remove a variable from the environment
2237 ppp_script_unsetenv(char *var)
2239 int vl = strlen(var);
2243 if (script_env == 0)
2245 for (i = 0; (p = script_env[i]) != 0; ++i) {
2246 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2248 if (p[-1] && pppdb != NULL)
2251 remove_script_env(i);
2262 * Any arbitrary string used as a key for locking the database.
2263 * It doesn't matter what it is as long as all pppds use the same string.
2265 #define PPPD_LOCK_KEY "pppd lock"
2268 * lock_db - get an exclusive lock on the TDB database.
2269 * Used to ensure atomicity of various lookup/modify operations.
2276 key.dptr = PPPD_LOCK_KEY;
2277 key.dsize = strlen(key.dptr);
2278 tdb_chainlock(pppdb, key);
2283 * unlock_db - remove the exclusive lock obtained by lock_db.
2285 void unlock_db(void)
2290 key.dptr = PPPD_LOCK_KEY;
2291 key.dsize = strlen(key.dptr);
2292 tdb_chainunlock(pppdb, key);
2298 * update_db_entry - update our entry in the database.
2301 update_db_entry(void)
2307 if (script_env == NULL)
2310 for (i = 0; (p = script_env[i]) != 0; ++i)
2311 vlen += strlen(p) + 1;
2312 vbuf = malloc(vlen + 1);
2314 novm("database entry");
2316 for (i = 0; (p = script_env[i]) != 0; ++i)
2317 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2320 key.dsize = strlen(db_key);
2323 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2324 error("tdb_store failed: %s", tdb_errorstr(pppdb));
2332 * add_db_key - add a key that we can use to look up our database entry.
2335 add_db_key(const char *str)
2339 key.dptr = (char *) str;
2340 key.dsize = strlen(str);
2342 dbuf.dsize = strlen(db_key);
2343 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2344 error("tdb_store key failed: %s", tdb_errorstr(pppdb));
2348 * delete_db_key - delete a key for looking up our database entry.
2351 delete_db_key(const char *str)
2355 key.dptr = (char *) str;
2356 key.dsize = strlen(str);
2357 tdb_delete(pppdb, key);
2361 * cleanup_db - delete all the entries we put in the database.
2371 key.dsize = strlen(db_key);
2372 tdb_delete(pppdb, key);
2373 for (i = 0; (p = script_env[i]) != 0; ++i)
2377 #endif /* PPP_WITH_TDB */