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) 1999-2020 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.
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>
100 #include "chap-new.h"
104 #include "pathnames.h"
116 #endif /* IPX_CHANGE */
123 char ifname[MAXIFNAMELEN]; /* Interface name */
124 int ifunit; /* Interface unit number */
126 struct channel *the_channel;
128 char *progname; /* Name of this program */
129 char hostname[MAXNAMELEN]; /* Our hostname */
130 static char pidfilename[MAXPATHLEN]; /* name of pid file */
131 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
132 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
133 uid_t uid; /* Our real user-id */
134 struct notifier *pidchange = NULL;
135 struct notifier *phasechange = NULL;
136 struct notifier *exitnotify = NULL;
137 struct notifier *sigreceived = NULL;
138 struct notifier *fork_notifier = NULL;
140 int hungup; /* terminal has been hung up */
141 int privileged; /* we're running as real uid root */
142 int need_holdoff; /* need holdoff period before restarting */
143 int detached; /* have detached from terminal */
144 volatile int status; /* exit status for pppd */
145 int unsuccess; /* # unsuccessful connection attempts */
146 int do_callback; /* != 0 if we should do callback next */
147 int doing_callback; /* != 0 if we are doing callback */
148 int ppp_session_number; /* Session number, for channels with such a
149 concept (eg PPPoE) */
150 int childwait_done; /* have timed out waiting for children */
153 TDB_CONTEXT *pppdb; /* database for storing status etc. */
158 int (*holdoff_hook)(void) = NULL;
159 int (*new_phase_hook)(int) = NULL;
160 void (*snoop_recv_hook)(unsigned char *p, int len) = NULL;
161 void (*snoop_send_hook)(unsigned char *p, int len) = NULL;
163 static int conn_running; /* we have a [dis]connector running */
164 static int fd_loop; /* fd for getting demand-dial packets */
166 int fd_devnull; /* fd for /dev/null */
167 int devfd = -1; /* fd of underlying device */
168 int fd_ppp = -1; /* fd for talking PPP */
169 int phase; /* where the link is at */
178 static sigset_t signals_handled;
180 static int sigpipe[2];
182 char **script_env; /* Env. variable values for scripts */
183 int s_env_nalloc; /* # words avail at script_env */
185 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
186 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
188 static int n_children; /* # child processes still running */
189 static int got_sigchld; /* set if we have received a SIGCHLD */
191 int privopen; /* don't lock, open device as root */
193 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
195 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
196 int ngroups; /* How many groups valid in groups */
198 static struct timeval start_time; /* Time when link was started. */
200 static struct pppd_stats old_link_stats;
201 struct pppd_stats link_stats;
202 unsigned link_connect_time;
203 int link_stats_valid;
208 bool bundle_terminating;
211 * We maintain a list of child process pids and
212 * functions to call when they exit.
217 void (*done)(void *);
220 struct subprocess *next;
223 static struct subprocess *children;
225 /* Prototypes for procedures local to this file. */
227 static void setup_signals(void);
228 static void create_pidfile(int pid);
229 static void create_linkpidfile(int pid);
230 static void cleanup(void);
231 static void get_input(void);
232 static void calltimeout(void);
233 static struct timeval *timeleft(struct timeval *);
234 static void kill_my_pg(int);
235 static void hup(int);
236 static void term(int);
237 static void chld(int);
238 static void toggle_debug(int);
239 static void open_ccp(int);
240 static void bad_signal(int);
241 static void holdoff_end(void *);
242 static void forget_child(int pid, int status);
243 static int reap_kids(void);
244 static void childwait_end(void *);
247 static void update_db_entry(void);
248 static void add_db_key(const char *);
249 static void delete_db_key(const char *);
250 static void cleanup_db(void);
253 static void handle_events(void);
254 void print_link_stats(void);
256 extern char *getlogin(void);
257 int main(int, char *[]);
260 * PPP Data Link Layer "protocol" table.
261 * One entry per supported protocol.
262 * The last entry must be NULL.
264 struct protent *protocols[] = {
288 main(int argc, char *argv[])
293 struct protent *protp;
296 strlcpy(path_ipup, _PATH_IPUP, sizeof(path_ipup));
297 strlcpy(path_ipdown, _PATH_IPDOWN, sizeof(path_ipdown));
299 link_stats_valid = 0;
300 new_phase(PHASE_INITIALIZE);
304 /* Initialize syslog facilities */
307 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
308 option_error("Couldn't get hostname: %m");
311 hostname[MAXNAMELEN-1] = 0;
313 /* make sure we don't create world or group writable files. */
314 umask(umask(0777) | 022);
317 privileged = uid == 0;
318 slprintf(numbuf, sizeof(numbuf), "%d", uid);
319 script_setenv("ORIG_UID", numbuf, 0);
321 ngroups = getgroups(NGROUPS_MAX, groups);
324 * Initialize magic number generator now so that protocols may
325 * use magic numbers in initialization.
330 * Initialize each protocol.
332 for (i = 0; (protp = protocols[i]) != NULL; ++i)
336 * Initialize the default channel.
343 * Parse, in order, the system options file, the user's options file,
344 * and the command line arguments.
346 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
347 || !options_from_user()
348 || !parse_args(argc-1, argv+1))
349 exit(EXIT_OPTION_ERROR);
350 devnam_fixed = 1; /* can no longer change device name */
353 * Work out the device name, if it hasn't already been specified,
354 * and parse the tty's options file.
356 if (the_channel->process_extra_options)
357 (*the_channel->process_extra_options)();
360 setlogmask(LOG_UPTO(LOG_DEBUG));
363 * Check that we are running as root.
365 if (geteuid() != 0) {
366 option_error("must be root to run %s, since it is not setuid-root",
371 if (!ppp_available()) {
372 option_error("%s", no_ppp_msg);
373 exit(EXIT_NO_KERNEL_SUPPORT);
377 * Check that the options given are valid and consistent.
380 if (!sys_check_options())
381 exit(EXIT_OPTION_ERROR);
382 auth_check_options();
383 #ifdef HAVE_MULTILINK
386 for (i = 0; (protp = protocols[i]) != NULL; ++i)
387 if (protp->check_options != NULL)
388 (*protp->check_options)();
389 if (the_channel->check_options)
390 (*the_channel->check_options)();
393 if (dump_options || dryrun) {
394 init_pr_log(NULL, LOG_INFO);
395 print_options(pr_log, NULL);
402 /* Make sure fds 0, 1, 2 are open to somewhere. */
403 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
405 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
406 while (fd_devnull <= 2) {
409 fatal("Critical shortage of file descriptors: dup failed: %m");
414 * Initialize system-dependent stuff.
419 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
421 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
424 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
426 warn("Warning: disabling multilink");
433 * Detach ourselves from the terminal, if required,
434 * and identify who is running us.
436 if (!nodetach && !updetach)
441 if (pw != NULL && pw->pw_name != NULL)
446 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
447 script_setenv("PPPLOGNAME", p, 0);
450 script_setenv("DEVICE", devnam, 1);
451 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
452 script_setenv("PPPD_PID", numbuf, 1);
456 create_linkpidfile(getpid());
461 * If we're doing dial-on-demand, set up the interface now.
465 * Open the loopback channel and set it up to be the ppp interface.
467 fd_loop = open_ppp_loopback();
470 * Configure the interface and mark it up, etc.
479 bundle_terminating = 0;
485 doing_callback = do_callback;
488 if (demand && !doing_callback) {
490 * Don't do anything until we see some activity.
492 new_phase(PHASE_DORMANT);
499 if (get_loop_output())
507 * Now we want to bring up the link.
510 info("Starting link");
513 get_time(&start_time);
514 script_unsetenv("CONNECT_TIME");
515 script_unsetenv("BYTES_SENT");
516 script_unsetenv("BYTES_RCVD");
518 lcp_open(0); /* Start protocol */
520 while (phase != PHASE_DEAD) {
524 lcp_close(0, "User request");
526 bundle_terminating = 1;
527 if (phase == PHASE_MASTER)
528 mp_bundle_terminated();
531 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
532 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
533 (*ccp_protent.open)(0);
537 /* restore FSMs to original state */
540 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
545 t = need_holdoff? holdoff: 0;
547 t = (*holdoff_hook)();
549 new_phase(PHASE_HOLDOFF);
550 TIMEOUT(holdoff_end, NULL, t);
554 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
555 } while (phase == PHASE_HOLDOFF);
561 /* Wait for scripts to finish */
563 if (n_children > 0) {
565 TIMEOUT(childwait_end, NULL, child_wait);
567 struct subprocess *chp;
568 dbglog("Waiting for %d child processes...", n_children);
569 for (chp = children; chp != NULL; chp = chp->next)
570 dbglog(" script %s, pid %d", chp->prog, chp->pid);
572 while (n_children > 0 && !childwait_done) {
574 if (kill_link && !childwait_done)
584 * handle_events - wait for something to happen and respond to it.
590 unsigned char buf[16];
592 kill_link = open_ccp_flag = 0;
594 /* alert via signal pipe */
596 /* flush signal pipe */
597 for (; read(sigpipe[0], buf, sizeof(buf)) > 0; );
599 /* wait if necessary */
600 if (!(got_sighup || got_sigterm || got_sigusr2 || got_sigchld))
601 wait_input(timeleft(&timo));
603 remove_fd(sigpipe[0]);
607 info("Hangup (SIGHUP)");
610 if (status != EXIT_HANGUP)
611 status = EXIT_USER_REQUEST;
614 info("Terminating on signal %d", got_sigterm);
618 status = EXIT_USER_REQUEST;
623 reap_kids(); /* Don't leave dead kids lying around */
632 * setup_signals - initialize signal handling.
639 /* create pipe to wake up event handler from signal handler */
640 if (pipe(sigpipe) < 0)
641 fatal("Couldn't create signal pipe: %m");
642 fcntl(sigpipe[0], F_SETFD, fcntl(sigpipe[0], F_GETFD) | FD_CLOEXEC);
643 fcntl(sigpipe[1], F_SETFD, fcntl(sigpipe[1], F_GETFD) | FD_CLOEXEC);
644 fcntl(sigpipe[0], F_SETFL, fcntl(sigpipe[0], F_GETFL) | O_NONBLOCK);
645 fcntl(sigpipe[1], F_SETFL, fcntl(sigpipe[1], F_GETFL) | O_NONBLOCK);
648 * Compute mask of all interesting signals and install signal handlers
649 * for each. Only one signal handler may be active at a time. Therefore,
650 * all other signals should be masked when any handler is executing.
652 sigemptyset(&signals_handled);
653 sigaddset(&signals_handled, SIGHUP);
654 sigaddset(&signals_handled, SIGINT);
655 sigaddset(&signals_handled, SIGTERM);
656 sigaddset(&signals_handled, SIGCHLD);
657 sigaddset(&signals_handled, SIGUSR2);
659 #define SIGNAL(s, handler) do { \
660 sa.sa_handler = handler; \
661 if (sigaction(s, &sa, NULL) < 0) \
662 fatal("Couldn't establish signal handler (%d): %m", s); \
665 sa.sa_mask = signals_handled;
667 SIGNAL(SIGHUP, hup); /* Hangup */
668 SIGNAL(SIGINT, term); /* Interrupt */
669 SIGNAL(SIGTERM, term); /* Terminate */
670 SIGNAL(SIGCHLD, chld);
672 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
673 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
676 * Install a handler for other signals which would otherwise
677 * cause pppd to exit without cleaning up.
679 SIGNAL(SIGABRT, bad_signal);
680 SIGNAL(SIGALRM, bad_signal);
681 SIGNAL(SIGFPE, bad_signal);
682 SIGNAL(SIGILL, bad_signal);
683 SIGNAL(SIGPIPE, bad_signal);
684 SIGNAL(SIGQUIT, bad_signal);
685 SIGNAL(SIGSEGV, bad_signal);
687 SIGNAL(SIGBUS, bad_signal);
690 SIGNAL(SIGEMT, bad_signal);
693 SIGNAL(SIGPOLL, bad_signal);
696 SIGNAL(SIGPROF, bad_signal);
699 SIGNAL(SIGSYS, bad_signal);
702 SIGNAL(SIGTRAP, bad_signal);
705 SIGNAL(SIGVTALRM, bad_signal);
708 SIGNAL(SIGXCPU, bad_signal);
711 SIGNAL(SIGXFSZ, bad_signal);
715 * Apparently we can get a SIGPIPE when we call syslog, if
716 * syslogd has died and been restarted. Ignoring it seems
719 signal(SIGPIPE, SIG_IGN);
723 * set_ifunit - do things we need to do once we know which ppp
727 set_ifunit(int iskey)
731 if (req_ifname[0] != '\0')
732 slprintf(ifname, sizeof(ifname), "%s", req_ifname);
734 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
735 info("Using interface %s", ifname);
736 script_setenv("IFNAME", ifname, iskey);
737 slprintf(ifkey, sizeof(ifkey), "%d", ifunit);
738 script_setenv("UNIT", ifkey, iskey);
740 create_pidfile(getpid()); /* write pid to file */
741 create_linkpidfile(getpid());
746 * detach - detach us from the controlling terminal.
757 if (pipe(pipefd) == -1)
758 pipefd[0] = pipefd[1] = -1;
759 if ((pid = fork()) < 0) {
760 error("Couldn't detach (fork failed: %m)");
761 die(1); /* or just return? */
765 notify(pidchange, pid);
766 /* update pid files if they have been written already */
769 create_linkpidfile(pid);
770 exit(0); /* parent dies */
780 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
781 script_setenv("PPPD_PID", numbuf, 1);
783 /* wait for parent to finish updating pid & lock files and die */
785 complete_read(pipefd[0], numbuf, 1);
790 * reopen_log - (re)open our connection to syslog.
795 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
796 setlogmask(LOG_UPTO(LOG_INFO));
800 * Create a file containing our process ID.
803 create_pidfile(int pid)
807 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
808 _PATH_VARRUN, ifname);
809 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
810 fprintf(pidfile, "%d\n", pid);
811 (void) fclose(pidfile);
813 error("Failed to create pid file %s: %m", pidfilename);
819 create_linkpidfile(int pid)
823 if (linkname[0] == 0)
825 script_setenv("LINKNAME", linkname, 1);
826 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
827 _PATH_VARRUN, linkname);
828 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
829 fprintf(pidfile, "%d\n", pid);
831 fprintf(pidfile, "%s\n", ifname);
832 (void) fclose(pidfile);
834 error("Failed to create pid file %s: %m", linkpidfile);
840 * remove_pidfile - remove our pid files
842 void remove_pidfiles(void)
844 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
845 warn("unable to delete pid file %s: %m", pidfilename);
847 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
848 warn("unable to delete pid file %s: %m", linkpidfile);
853 * holdoff_end - called via a timeout when the holdoff period ends.
856 holdoff_end(void *arg)
858 new_phase(PHASE_DORMANT);
861 /* List of protocol names, to make our messages a little more informative. */
862 struct protocol_list {
865 } protocol_list[] = {
867 { 0x23, "OSI Network Layer" },
868 { 0x25, "Xerox NS IDP" },
869 { 0x27, "DECnet Phase IV" },
870 { 0x29, "Appletalk" },
871 { 0x2b, "Novell IPX" },
872 { 0x2d, "VJ compressed TCP/IP" },
873 { 0x2f, "VJ uncompressed TCP/IP" },
874 { 0x31, "Bridging PDU" },
875 { 0x33, "Stream Protocol ST-II" },
876 { 0x35, "Banyan Vines" },
877 { 0x39, "AppleTalk EDDP" },
878 { 0x3b, "AppleTalk SmartBuffered" },
879 { 0x3d, "Multi-Link" },
880 { 0x3f, "NETBIOS Framing" },
881 { 0x41, "Cisco Systems" },
882 { 0x43, "Ascom Timeplex" },
883 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
884 { 0x47, "DCA Remote Lan" },
885 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
886 { 0x4b, "SNA over 802.2" },
888 { 0x4f, "IP6 Header Compression" },
889 { 0x51, "KNX Bridging Data" },
890 { 0x53, "Encryption" },
891 { 0x55, "Individual Link Encryption" },
893 { 0x59, "PPP Muxing" },
894 { 0x5b, "Vendor-Specific Network Protocol" },
895 { 0x61, "RTP IPHC Full Header" },
896 { 0x63, "RTP IPHC Compressed TCP" },
897 { 0x65, "RTP IPHC Compressed non-TCP" },
898 { 0x67, "RTP IPHC Compressed UDP 8" },
899 { 0x69, "RTP IPHC Compressed RTP 8" },
900 { 0x6f, "Stampede Bridging" },
902 { 0xc1, "NTCITS IPI" },
903 { 0xfb, "single-link compression" },
904 { 0xfd, "Compressed Datagram" },
905 { 0x0201, "802.1d Hello Packets" },
906 { 0x0203, "IBM Source Routing BPDU" },
907 { 0x0205, "DEC LANBridge100 Spanning Tree" },
908 { 0x0207, "Cisco Discovery Protocol" },
909 { 0x0209, "Netcs Twin Routing" },
910 { 0x020b, "STP - Scheduled Transfer Protocol" },
911 { 0x020d, "EDP - Extreme Discovery Protocol" },
912 { 0x0211, "Optical Supervisory Channel Protocol" },
913 { 0x0213, "Optical Supervisory Channel Protocol" },
914 { 0x0231, "Luxcom" },
915 { 0x0233, "Sigma Network Systems" },
916 { 0x0235, "Apple Client Server Protocol" },
917 { 0x0281, "MPLS Unicast" },
918 { 0x0283, "MPLS Multicast" },
919 { 0x0285, "IEEE p1284.4 standard - data packets" },
920 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
921 { 0x0289, "Multichannel Flow Treatment Protocol" },
922 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
923 { 0x2065, "RTP IPHC Context State" },
924 { 0x2067, "RTP IPHC Compressed UDP 16" },
925 { 0x2069, "RTP IPHC Compressed RTP 16" },
926 { 0x4001, "Cray Communications Control Protocol" },
927 { 0x4003, "CDPD Mobile Network Registration Protocol" },
928 { 0x4005, "Expand accelerator protocol" },
929 { 0x4007, "ODSICP NCP" },
930 { 0x4009, "DOCSIS DLL" },
931 { 0x400B, "Cetacean Network Detection Protocol" },
932 { 0x4021, "Stacker LZS" },
933 { 0x4023, "RefTek Protocol" },
934 { 0x4025, "Fibre Channel" },
935 { 0x4027, "EMIT Protocols" },
936 { 0x405b, "Vendor-Specific Protocol (VSP)" },
937 { 0x8021, "Internet Protocol Control Protocol" },
938 { 0x8023, "OSI Network Layer Control Protocol" },
939 { 0x8025, "Xerox NS IDP Control Protocol" },
940 { 0x8027, "DECnet Phase IV Control Protocol" },
941 { 0x8029, "Appletalk Control Protocol" },
942 { 0x802b, "Novell IPX Control Protocol" },
943 { 0x8031, "Bridging NCP" },
944 { 0x8033, "Stream Protocol Control Protocol" },
945 { 0x8035, "Banyan Vines Control Protocol" },
946 { 0x803d, "Multi-Link Control Protocol" },
947 { 0x803f, "NETBIOS Framing Control Protocol" },
948 { 0x8041, "Cisco Systems Control Protocol" },
949 { 0x8043, "Ascom Timeplex" },
950 { 0x8045, "Fujitsu LBLB Control Protocol" },
951 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
952 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
953 { 0x804b, "SNA over 802.2 Control Protocol" },
954 { 0x804d, "SNA Control Protocol" },
955 { 0x804f, "IP6 Header Compression Control Protocol" },
956 { 0x8051, "KNX Bridging Control Protocol" },
957 { 0x8053, "Encryption Control Protocol" },
958 { 0x8055, "Individual Link Encryption Control Protocol" },
959 { 0x8057, "IPv6 Control Protocol" },
960 { 0x8059, "PPP Muxing Control Protocol" },
961 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
962 { 0x806f, "Stampede Bridging Control Protocol" },
963 { 0x8073, "MP+ Control Protocol" },
964 { 0x80c1, "NTCITS IPI Control Protocol" },
965 { 0x80fb, "Single Link Compression Control Protocol" },
966 { 0x80fd, "Compression Control Protocol" },
967 { 0x8207, "Cisco Discovery Protocol Control" },
968 { 0x8209, "Netcs Twin Routing" },
969 { 0x820b, "STP - Control Protocol" },
970 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
971 { 0x8235, "Apple Client Server Protocol Control" },
972 { 0x8281, "MPLSCP" },
973 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
974 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
975 { 0x8289, "Multichannel Flow Treatment Protocol" },
976 { 0xc021, "Link Control Protocol" },
977 { 0xc023, "Password Authentication Protocol" },
978 { 0xc025, "Link Quality Report" },
979 { 0xc027, "Shiva Password Authentication Protocol" },
980 { 0xc029, "CallBack Control Protocol (CBCP)" },
981 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
983 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
984 { 0xc081, "Container Control Protocol" },
985 { 0xc223, "Challenge Handshake Authentication Protocol" },
986 { 0xc225, "RSA Authentication Protocol" },
987 { 0xc227, "Extensible Authentication Protocol" },
988 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
989 { 0xc26f, "Stampede Bridging Authorization Protocol" },
990 { 0xc281, "Proprietary Authentication Protocol" },
991 { 0xc283, "Proprietary Authentication Protocol" },
992 { 0xc481, "Proprietary Node ID Authentication Protocol" },
997 * protocol_name - find a name for a PPP protocol.
1000 protocol_name(int proto)
1002 struct protocol_list *lp;
1004 for (lp = protocol_list; lp->proto != 0; ++lp)
1005 if (proto == lp->proto)
1011 * get_input - called when incoming data is available.
1019 struct protent *protp;
1021 p = inpacket_buf; /* point to beginning of packet buffer */
1023 len = read_packet(inpacket_buf);
1028 if (bundle_eof && multilink_master) {
1029 notice("Last channel has disconnected");
1030 mp_bundle_terminated();
1033 notice("Modem hangup");
1035 status = EXIT_HANGUP;
1036 lcp_lowerdown(0); /* serial link is no longer available */
1041 if (len < PPP_HDRLEN) {
1042 dbglog("received short packet:%.*B", len, p);
1046 dump_packet("rcvd", p, len);
1047 if (snoop_recv_hook) snoop_recv_hook(p, len);
1049 p += 2; /* Skip address and control */
1050 GETSHORT(protocol, p);
1054 * Toss all non-LCP packets unless LCP is OPEN.
1056 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1057 dbglog("Discarded non-LCP packet when LCP not open");
1062 * Until we get past the authentication phase, toss all packets
1063 * except LCP, LQR and authentication packets.
1065 if (phase <= PHASE_AUTHENTICATE
1066 && !(protocol == PPP_LCP || protocol == PPP_LQR
1067 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1068 protocol == PPP_EAP)) {
1069 dbglog("discarding proto 0x%x in phase %d",
1075 * Upcall the proper protocol input routine.
1077 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1078 if (protp->protocol == protocol && protp->enabled_flag) {
1079 (*protp->input)(0, p, len);
1082 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1083 && protp->datainput != NULL) {
1084 (*protp->datainput)(0, p, len);
1090 const char *pname = protocol_name(protocol);
1092 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1094 warn("Unsupported protocol 0x%x received", protocol);
1096 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1100 * ppp_send_config - configure the transmit-side characteristics of
1101 * the ppp interface. Returns -1, indicating an error, if the channel
1102 * send_config procedure called error() (or incremented error_count
1103 * itself), otherwise 0.
1106 ppp_send_config(int unit, int mtu, u_int32_t accm, int pcomp, int accomp)
1110 if (the_channel->send_config == NULL)
1113 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1114 return (error_count != errs)? -1: 0;
1118 * ppp_recv_config - configure the receive-side characteristics of
1119 * the ppp interface. Returns -1, indicating an error, if the channel
1120 * recv_config procedure called error() (or incremented error_count
1121 * itself), otherwise 0.
1124 ppp_recv_config(int unit, int mru, u_int32_t accm, int pcomp, int accomp)
1128 if (the_channel->recv_config == NULL)
1131 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1132 return (error_count != errs)? -1: 0;
1136 * new_phase - signal the start of a new phase of pppd's operation.
1143 (*new_phase_hook)(p);
1144 notify(phasechange, p);
1148 * die - clean up state and exit with the specified status.
1153 if (!doing_multilink || multilink_master)
1156 notify(exitnotify, status);
1157 syslog(LOG_INFO, "Exit.");
1162 * cleanup - restore anything which needs to be restored before we exit
1171 the_channel->disestablish_ppp(devfd);
1172 if (the_channel->cleanup)
1173 (*the_channel->cleanup)();
1184 print_link_stats(void)
1187 * Print connect time and statistics.
1189 if (link_stats_valid) {
1190 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1191 info("Connect time %d.%d minutes.", t/10, t%10);
1192 info("Sent %u bytes, received %u bytes.",
1193 link_stats.bytes_out, link_stats.bytes_in);
1194 link_stats_valid = 0;
1199 * reset_link_stats - "reset" stats when link goes up.
1202 reset_link_stats(int u)
1204 if (!get_ppp_stats(u, &old_link_stats))
1206 get_time(&start_time);
1210 * update_link_stats - get stats at link termination.
1213 update_link_stats(int u)
1218 if (!get_ppp_stats(u, &link_stats)
1219 || get_time(&now) < 0)
1221 link_connect_time = now.tv_sec - start_time.tv_sec;
1222 link_stats_valid = 1;
1224 link_stats.bytes_in -= old_link_stats.bytes_in;
1225 link_stats.bytes_out -= old_link_stats.bytes_out;
1226 link_stats.pkts_in -= old_link_stats.pkts_in;
1227 link_stats.pkts_out -= old_link_stats.pkts_out;
1229 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1230 script_setenv("CONNECT_TIME", numbuf, 0);
1231 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1232 script_setenv("BYTES_SENT", numbuf, 0);
1233 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1234 script_setenv("BYTES_RCVD", numbuf, 0);
1239 struct timeval c_time; /* time at which to call routine */
1240 void *c_arg; /* argument to routine */
1241 void (*c_func)(void *); /* routine */
1242 struct callout *c_next;
1245 static struct callout *callout = NULL; /* Callout list */
1246 static struct timeval timenow; /* Current time */
1249 * timeout - Schedule a timeout.
1252 timeout(void (*func)(void *), void *arg, int secs, int usecs)
1254 struct callout *newp, *p, **pp;
1259 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1260 fatal("Out of memory in timeout()!");
1262 newp->c_func = func;
1264 newp->c_time.tv_sec = timenow.tv_sec + secs;
1265 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1266 if (newp->c_time.tv_usec >= 1000000) {
1267 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1268 newp->c_time.tv_usec %= 1000000;
1272 * Find correct place and link it in.
1274 for (pp = &callout; (p = *pp); pp = &p->c_next)
1275 if (newp->c_time.tv_sec < p->c_time.tv_sec
1276 || (newp->c_time.tv_sec == p->c_time.tv_sec
1277 && newp->c_time.tv_usec < p->c_time.tv_usec))
1285 * untimeout - Unschedule a timeout.
1288 untimeout(void (*func)(void *), void *arg)
1290 struct callout **copp, *freep;
1293 * Find first matching timeout and remove it from the list.
1295 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1296 if (freep->c_func == func && freep->c_arg == arg) {
1297 *copp = freep->c_next;
1298 free((char *) freep);
1305 * calltimeout - Call any timeout routines which are now due.
1312 while (callout != NULL) {
1315 if (get_time(&timenow) < 0)
1316 fatal("Failed to get time of day: %m");
1317 if (!(p->c_time.tv_sec < timenow.tv_sec
1318 || (p->c_time.tv_sec == timenow.tv_sec
1319 && p->c_time.tv_usec <= timenow.tv_usec)))
1320 break; /* no, it's not time yet */
1322 callout = p->c_next;
1323 (*p->c_func)(p->c_arg);
1331 * timeleft - return the length of time until the next timeout is due.
1333 static struct timeval *
1334 timeleft(struct timeval *tvp)
1336 if (callout == NULL)
1340 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1341 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1342 if (tvp->tv_usec < 0) {
1343 tvp->tv_usec += 1000000;
1346 if (tvp->tv_sec < 0)
1347 tvp->tv_sec = tvp->tv_usec = 0;
1354 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1355 * We assume that sig is currently blocked.
1360 struct sigaction act, oldact;
1361 struct subprocess *chp;
1365 * There might be other things in our process group that we
1366 * didn't start that would get hit if we did a kill(0), so
1367 * just send the signal individually to our children.
1369 for (chp = children; chp != NULL; chp = chp->next)
1371 kill(chp->pid, sig);
1375 /* We've done a setsid(), so we can just use a kill(0) */
1376 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1377 act.sa_handler = SIG_IGN;
1381 * The kill() above made the signal pending for us, as well as
1382 * the rest of our process group, but we don't want it delivered
1383 * to us. It is blocked at the moment. Setting it to be ignored
1384 * will cause the pending signal to be discarded. If we did the
1385 * kill() after setting the signal to be ignored, it is unspecified
1386 * (by POSIX) whether the signal is immediately discarded or left
1387 * pending, and in fact Linux would leave it pending, and so it
1388 * would be delivered after the current signal handler exits,
1389 * leading to an infinite loop.
1391 sigaction(sig, &act, &oldact);
1392 sigaction(sig, &oldact, NULL);
1397 * hup - Catch SIGHUP signal.
1399 * Indicates that the physical layer has been disconnected.
1400 * We don't rely on this indication; if the user has sent this
1401 * signal, we just take the link down.
1406 /* can't log a message here, it can deadlock */
1409 /* Send the signal to the [dis]connector process(es) also */
1411 notify(sigreceived, sig);
1413 write(sigpipe[1], &sig, sizeof(sig));
1418 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1420 * Indicates that we should initiate a graceful disconnect and exit.
1426 /* can't log a message here, it can deadlock */
1429 /* Send the signal to the [dis]connector process(es) also */
1431 notify(sigreceived, sig);
1433 write(sigpipe[1], &sig, sizeof(sig));
1438 * chld - Catch SIGCHLD signal.
1439 * Sets a flag so we will call reap_kids in the mainline.
1446 write(sigpipe[1], &sig, sizeof(sig));
1451 * toggle_debug - Catch SIGUSR1 signal.
1453 * Toggle debug flag.
1457 toggle_debug(int sig)
1461 setlogmask(LOG_UPTO(LOG_DEBUG));
1463 setlogmask(LOG_UPTO(LOG_WARNING));
1469 * open_ccp - Catch SIGUSR2 signal.
1471 * Try to (re)negotiate compression.
1479 write(sigpipe[1], &sig, sizeof(sig));
1484 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1489 static int crashed = 0;
1494 error("Fatal signal %d", sig);
1496 kill_my_pg(SIGTERM);
1497 notify(sigreceived, sig);
1502 * safe_fork - Create a child process. The child closes all the
1503 * file descriptors that we don't want to leak to a script.
1504 * The parent waits for the child to do this before returning.
1505 * This also arranges for the specified fds to be dup'd to
1506 * fds 0, 1, 2 in the child.
1509 safe_fork(int infd, int outfd, int errfd)
1515 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1516 while ((fd = dup(fd_devnull)) >= 0) {
1523 if (pipe(pipefd) == -1)
1524 pipefd[0] = pipefd[1] = -1;
1527 error("fork failed: %m");
1533 /* this read() blocks until the close(pipefd[1]) below */
1534 complete_read(pipefd[0], buf, 1);
1539 /* Executing in the child */
1546 /* make sure infd, outfd and errfd won't get tromped on below */
1547 if (infd == 1 || infd == 2)
1549 if (outfd == 0 || outfd == 2)
1551 if (errfd == 0 || errfd == 1)
1556 /* dup the in, out, err fds to 0, 1, 2 */
1566 if (the_channel->close)
1567 (*the_channel->close)();
1569 close(devfd); /* some plugins don't have a close function */
1579 notify(fork_notifier, 0);
1581 /* this close unblocks the read() call above in the parent */
1588 add_script_env(int pos, char *newstring)
1590 if (pos + 1 >= s_env_nalloc) {
1591 int new_n = pos + 17;
1592 char **newenv = realloc(script_env, new_n * sizeof(char *));
1593 if (newenv == NULL) {
1594 free(newstring - 1);
1597 script_env = newenv;
1598 s_env_nalloc = new_n;
1600 script_env[pos] = newstring;
1601 script_env[pos + 1] = NULL;
1606 remove_script_env(int pos)
1608 free(script_env[pos] - 1);
1609 while ((script_env[pos] = script_env[pos + 1]) != NULL)
1614 * update_system_environment - process the list of set/unset options
1615 * and update the system environment.
1618 update_system_environment(void)
1620 struct userenv *uep;
1622 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1624 setenv(uep->ue_name, uep->ue_value, 1);
1626 unsetenv(uep->ue_name);
1631 * device_script - run a program to talk to the specified fds
1632 * (e.g. to run the connector or disconnector script).
1633 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1636 device_script(char *program, int in, int out, int dont_wait)
1645 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1648 pid = safe_fork(in, out, errfd);
1650 if (pid != 0 && log_to_fd < 0)
1655 error("Failed to create child process: %m");
1660 record_child(pid, program, NULL, NULL, 1);
1663 while (waitpid(pid, &status, 0) < 0) {
1666 fatal("error waiting for (dis)connection process: %m");
1668 forget_child(pid, status);
1671 return (status == 0 ? 0 : -1);
1674 /* here we are executing in the child */
1678 if (getuid() != uid) {
1679 fprintf(stderr, "pppd: setuid failed\n");
1682 update_system_environment();
1683 execl("/bin/sh", "sh", "-c", program, (char *)0);
1684 perror("pppd: could not exec /bin/sh");
1691 * update_script_environment - process the list of set/unset options
1692 * and update the script environment. Note that we intentionally do
1693 * not update the TDB. These changes are layered on top right before
1694 * exec. It is not possible to use script_setenv() or
1695 * script_unsetenv() safely after this routine is run.
1698 update_script_environment(void)
1700 struct userenv *uep;
1702 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1704 char *p, *newstring;
1705 int nlen = strlen(uep->ue_name);
1707 for (i = 0; (p = script_env[i]) != NULL; i++) {
1708 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=')
1711 if (uep->ue_isset) {
1712 nlen += strlen(uep->ue_value) + 2;
1713 newstring = malloc(nlen + 1);
1714 if (newstring == NULL)
1717 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value);
1719 script_env[i] = newstring;
1721 add_script_env(i, newstring);
1722 } else if (p != NULL) {
1723 remove_script_env(i);
1729 * run_program - execute a program with given arguments,
1730 * but don't wait for it unless wait is non-zero.
1731 * If the program can't be executed, logs an error unless
1732 * must_exist is 0 and the program file doesn't exist.
1733 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1734 * or isn't an executable plain file, or the process ID of the child.
1735 * If done != NULL, (*done)(arg) will be called later (within
1736 * reap_kids) iff the return value is > 0.
1739 run_program(char *prog, char **args, int must_exist, void (*done)(void *), void *arg, int wait)
1745 * First check if the file exists and is executable.
1746 * We don't use access() because that would use the
1747 * real user-id, which might not be root, and the script
1748 * might be accessible only to root.
1751 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1752 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1753 if (must_exist || errno != ENOENT)
1754 warn("Can't execute %s: %m", prog);
1758 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1760 error("Failed to create child process for %s: %m", prog);
1765 dbglog("Script %s started (pid %d)", prog, pid);
1766 record_child(pid, prog, done, arg, 0);
1768 while (waitpid(pid, &status, 0) < 0) {
1771 fatal("error waiting for script %s: %m", prog);
1773 forget_child(pid, status);
1778 /* Leave the current location */
1779 (void) setsid(); /* No controlling tty. */
1780 (void) umask (S_IRWXG|S_IRWXO);
1781 (void) chdir ("/"); /* no current directory. */
1782 setuid(0); /* set real UID = root */
1786 /* Force the priority back to zero if pppd is running higher. */
1787 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1788 warn("can't reset priority to 0: %m");
1791 /* run the program */
1792 update_script_environment();
1793 execve(prog, args, script_env);
1794 if (must_exist || errno != ENOENT) {
1795 /* have to reopen the log, there's nowhere else
1796 for the message to go. */
1798 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1806 * record_child - add a child process to the list for reap_kids
1810 record_child(int pid, char *prog, void (*done)(void *), void *arg, int killable)
1812 struct subprocess *chp;
1816 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1818 warn("losing track of %s process", prog);
1824 chp->next = children;
1825 chp->killable = killable;
1831 * childwait_end - we got fed up waiting for the child processes to
1832 * exit, send them all a SIGTERM.
1835 childwait_end(void *arg)
1837 struct subprocess *chp;
1839 for (chp = children; chp != NULL; chp = chp->next) {
1841 dbglog("sending SIGTERM to process %d", chp->pid);
1842 kill(chp->pid, SIGTERM);
1848 * forget_child - clean up after a dead child
1851 forget_child(int pid, int status)
1853 struct subprocess *chp, **prevp;
1855 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1856 if (chp->pid == pid) {
1862 if (WIFSIGNALED(status)) {
1863 warn("Child process %s (pid %d) terminated with signal %d",
1864 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1866 dbglog("Script %s finished (pid %d), status = 0x%x",
1867 (chp? chp->prog: "??"), pid,
1868 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1869 if (chp && chp->done)
1870 (*chp->done)(chp->arg);
1876 * reap_kids - get status from any dead child processes,
1877 * and log a message for abnormal terminations.
1884 if (n_children == 0)
1886 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1887 forget_child(pid, status);
1890 if (errno == ECHILD)
1893 error("Error waiting for child process: %m");
1899 * add_notifier - add a new function to be called when something happens.
1902 add_notifier(struct notifier **notif, notify_func func, void *arg)
1904 struct notifier *np;
1906 np = malloc(sizeof(struct notifier));
1908 novm("notifier struct");
1916 * remove_notifier - remove a function from the list of things to
1917 * be called when something happens.
1920 remove_notifier(struct notifier **notif, notify_func func, void *arg)
1922 struct notifier *np;
1924 for (; (np = *notif) != 0; notif = &np->next) {
1925 if (np->func == func && np->arg == arg) {
1934 * notify - call a set of functions registered with add_notifier.
1937 notify(struct notifier *notif, int val)
1939 struct notifier *np;
1941 while ((np = notif) != 0) {
1943 (*np->func)(np->arg, val);
1948 * novm - log an error message saying we ran out of memory, and die.
1953 fatal("Virtual memory exhausted allocating %s\n", msg);
1957 * script_setenv - set an environment variable value to be used
1958 * for scripts that we run (e.g. ip-up, auth-up, etc.)
1961 script_setenv(char *var, char *value, int iskey)
1963 size_t varl = strlen(var);
1964 size_t vl = varl + strlen(value) + 2;
1966 char *p, *newstring;
1968 newstring = (char *) malloc(vl+1);
1971 *newstring++ = iskey;
1972 slprintf(newstring, vl, "%s=%s", var, value);
1974 /* check if this variable is already set */
1975 if (script_env != 0) {
1976 for (i = 0; (p = script_env[i]) != 0; ++i) {
1977 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
1979 if (p[-1] && pppdb != NULL)
1983 script_env[i] = newstring;
1985 if (pppdb != NULL) {
1987 add_db_key(newstring);
1995 /* no space allocated for script env. ptrs. yet */
1997 script_env = malloc(16 * sizeof(char *));
1998 if (script_env == 0) {
1999 free(newstring - 1);
2005 if (!add_script_env(i, newstring))
2009 if (pppdb != NULL) {
2011 add_db_key(newstring);
2018 * script_unsetenv - remove a variable from the environment
2022 script_unsetenv(char *var)
2024 int vl = strlen(var);
2028 if (script_env == 0)
2030 for (i = 0; (p = script_env[i]) != 0; ++i) {
2031 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2033 if (p[-1] && pppdb != NULL)
2036 remove_script_env(i);
2047 * Any arbitrary string used as a key for locking the database.
2048 * It doesn't matter what it is as long as all pppds use the same string.
2050 #define PPPD_LOCK_KEY "pppd lock"
2053 * lock_db - get an exclusive lock on the TDB database.
2054 * Used to ensure atomicity of various lookup/modify operations.
2061 key.dptr = PPPD_LOCK_KEY;
2062 key.dsize = strlen(key.dptr);
2063 tdb_chainlock(pppdb, key);
2068 * unlock_db - remove the exclusive lock obtained by lock_db.
2070 void unlock_db(void)
2075 key.dptr = PPPD_LOCK_KEY;
2076 key.dsize = strlen(key.dptr);
2077 tdb_chainunlock(pppdb, key);
2083 * update_db_entry - update our entry in the database.
2086 update_db_entry(void)
2092 if (script_env == NULL)
2095 for (i = 0; (p = script_env[i]) != 0; ++i)
2096 vlen += strlen(p) + 1;
2097 vbuf = malloc(vlen + 1);
2099 novm("database entry");
2101 for (i = 0; (p = script_env[i]) != 0; ++i)
2102 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2105 key.dsize = strlen(db_key);
2108 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2109 error("tdb_store failed: %s", tdb_errorstr(pppdb));
2117 * add_db_key - add a key that we can use to look up our database entry.
2120 add_db_key(const char *str)
2124 key.dptr = (char *) str;
2125 key.dsize = strlen(str);
2127 dbuf.dsize = strlen(db_key);
2128 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2129 error("tdb_store key failed: %s", tdb_errorstr(pppdb));
2133 * delete_db_key - delete a key for looking up our database entry.
2136 delete_db_key(const char *str)
2140 key.dptr = (char *) str;
2141 key.dsize = strlen(str);
2142 tdb_delete(pppdb, key);
2146 * cleanup_db - delete all the entries we put in the database.
2156 key.dsize = strlen(db_key);
2157 tdb_delete(pppdb, key);
2158 for (i = 0; (p = script_env[i]) != 0; ++i)
2162 #endif /* USE_TDB */