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.
85 #include <sys/param.h>
86 #include <sys/types.h>
89 #include <sys/resource.h>
91 #include <sys/socket.h>
92 #include <netinet/in.h>
93 #include <arpa/inet.h>
103 #ifdef PPP_WITH_IPV6CP
107 #include "chap-new.h"
111 #include "pathnames.h"
127 char ifname[IFNAMSIZ]; /* Interface name */
128 int ifunit; /* Interface unit number */
130 struct channel *the_channel;
132 char *progname; /* Name of this program */
133 char hostname[MAXNAMELEN]; /* Our hostname */
134 static char pidfilename[MAXPATHLEN]; /* name of pid file */
135 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
136 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
137 uid_t uid; /* Our real user-id */
138 struct notifier *pidchange = NULL;
139 struct notifier *phasechange = NULL;
140 struct notifier *exitnotify = NULL;
141 struct notifier *sigreceived = NULL;
142 struct notifier *fork_notifier = NULL;
144 int hungup; /* terminal has been hung up */
145 int privileged; /* we're running as real uid root */
146 int need_holdoff; /* need holdoff period before restarting */
147 int detached; /* have detached from terminal */
148 volatile int status; /* exit status for pppd */
149 int unsuccess; /* # unsuccessful connection attempts */
150 int do_callback; /* != 0 if we should do callback next */
151 int doing_callback; /* != 0 if we are doing callback */
152 int ppp_session_number; /* Session number, for channels with such a
153 concept (eg PPPoE) */
154 int childwait_done; /* have timed out waiting for children */
157 TDB_CONTEXT *pppdb; /* database for storing status etc. */
162 int (*holdoff_hook)(void) = NULL;
163 int (*new_phase_hook)(int) = NULL;
164 void (*snoop_recv_hook)(unsigned char *p, int len) = NULL;
165 void (*snoop_send_hook)(unsigned char *p, int len) = NULL;
167 static int conn_running; /* we have a [dis]connector running */
168 static int fd_loop; /* fd for getting demand-dial packets */
170 int fd_devnull; /* fd for /dev/null */
171 int devfd = -1; /* fd of underlying device */
172 int fd_ppp = -1; /* fd for talking PPP */
173 int phase; /* where the link is at */
182 static sigset_t signals_handled;
184 static int sigpipe[2];
186 char **script_env; /* Env. variable values for scripts */
187 int s_env_nalloc; /* # words avail at script_env */
189 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
190 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
192 static int n_children; /* # child processes still running */
193 static int got_sigchld; /* set if we have received a SIGCHLD */
195 int privopen; /* don't lock, open device as root */
197 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
199 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
200 int ngroups; /* How many groups valid in groups */
202 static struct timeval start_time; /* Time when link was started. */
204 static struct pppd_stats old_link_stats;
205 struct pppd_stats link_stats;
206 unsigned link_connect_time;
207 int link_stats_valid;
212 bool bundle_terminating;
215 * We maintain a list of child process pids and
216 * functions to call when they exit.
221 void (*done)(void *);
224 struct subprocess *next;
227 static struct subprocess *children;
229 /* Prototypes for procedures local to this file. */
231 static void setup_signals(void);
232 static void create_pidfile(int pid);
233 static void create_linkpidfile(int pid);
234 static void cleanup(void);
235 static void get_input(void);
236 static void calltimeout(void);
237 static struct timeval *timeleft(struct timeval *);
238 static void kill_my_pg(int);
239 static void hup(int);
240 static void term(int);
241 static void chld(int);
242 static void toggle_debug(int);
243 static void open_ccp(int);
244 static void bad_signal(int);
245 static void holdoff_end(void *);
246 static void forget_child(int pid, int status);
247 static int reap_kids(void);
248 static void childwait_end(void *);
251 static void update_db_entry(void);
252 static void add_db_key(const char *);
253 static void delete_db_key(const char *);
254 static void cleanup_db(void);
257 static void handle_events(void);
258 void print_link_stats(void);
260 extern char *getlogin(void);
261 int main(int, char *[]);
264 * PPP Data Link Layer "protocol" table.
265 * One entry per supported protocol.
266 * The last entry must be NULL.
268 struct protent *protocols[] = {
276 #ifdef PPP_WITH_IPV6CP
289 main(int argc, char *argv[])
294 struct protent *protp;
297 strlcpy(path_ipup, PPP_PATH_IPUP, MAXPATHLEN);
298 strlcpy(path_ipdown, PPP_PATH_IPDOWN, MAXPATHLEN);
300 #ifdef PPP_WITH_IPV6CP
301 strlcpy(path_ipv6up, PPP_PATH_IPV6UP, MAXPATHLEN);
302 strlcpy(path_ipv6down, PPP_PATH_IPV6DOWN, MAXPATHLEN);
304 link_stats_valid = 0;
305 new_phase(PHASE_INITIALIZE);
309 /* Initialize syslog facilities */
312 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
313 option_error("Couldn't get hostname: %m");
316 hostname[MAXNAMELEN-1] = 0;
318 /* make sure we don't create world or group writable files. */
319 umask(umask(0777) | 022);
322 privileged = uid == 0;
323 slprintf(numbuf, sizeof(numbuf), "%d", uid);
324 script_setenv("ORIG_UID", numbuf, 0);
326 ngroups = getgroups(NGROUPS_MAX, groups);
329 * Initialize magic number generator now so that protocols may
330 * use magic numbers in initialization.
335 * Initialize each protocol.
337 for (i = 0; (protp = protocols[i]) != NULL; ++i)
341 * Initialize the default channel.
348 * Parse, in order, the system options file, the user's options file,
349 * and the command line arguments.
351 if (!options_from_file(PPP_PATH_SYSOPTIONS, !privileged, 0, 1)
352 || !options_from_user()
353 || !parse_args(argc-1, argv+1))
354 exit(EXIT_OPTION_ERROR);
355 devnam_fixed = 1; /* can no longer change device name */
358 * Work out the device name, if it hasn't already been specified,
359 * and parse the tty's options file.
361 if (the_channel->process_extra_options)
362 (*the_channel->process_extra_options)();
365 setlogmask(LOG_UPTO(LOG_DEBUG));
373 * Check that we are running as root.
375 if (geteuid() != 0) {
376 option_error("must be root to run %s, since it is not setuid-root",
381 if (!ppp_available()) {
382 option_error("%s", no_ppp_msg);
383 exit(EXIT_NO_KERNEL_SUPPORT);
387 * Check that the options given are valid and consistent.
390 if (!sys_check_options())
391 exit(EXIT_OPTION_ERROR);
392 auth_check_options();
393 #ifdef PPP_WITH_MULTILINK
396 for (i = 0; (protp = protocols[i]) != NULL; ++i)
397 if (protp->check_options != NULL)
398 (*protp->check_options)();
399 if (the_channel->check_options)
400 (*the_channel->check_options)();
403 if (dump_options || dryrun) {
404 init_pr_log(NULL, LOG_INFO);
405 print_options(pr_log, NULL);
412 /* Make sure fds 0, 1, 2 are open to somewhere. */
413 fd_devnull = open(PPP_DEVNULL, O_RDWR);
415 fatal("Couldn't open %s: %m", PPP_DEVNULL);
416 while (fd_devnull <= 2) {
419 fatal("Critical shortage of file descriptors: dup failed: %m");
424 * Initialize system-dependent stuff.
429 pppdb = tdb_open(PPP_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
431 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
434 warn("Warning: couldn't open ppp database %s", PPP_PATH_PPPDB);
436 warn("Warning: disabling multilink");
443 * Detach ourselves from the terminal, if required,
444 * and identify who is running us.
446 if (!nodetach && !updetach)
451 if (pw != NULL && pw->pw_name != NULL)
456 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
457 script_setenv("PPPLOGNAME", p, 0);
460 script_setenv("DEVICE", devnam, 1);
461 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
462 script_setenv("PPPD_PID", numbuf, 1);
466 create_linkpidfile(getpid());
471 * If we're doing dial-on-demand, set up the interface now.
475 * Open the loopback channel and set it up to be the ppp interface.
477 fd_loop = open_ppp_loopback();
480 * Configure the interface and mark it up, etc.
489 bundle_terminating = 0;
495 doing_callback = do_callback;
498 if (demand && !doing_callback) {
500 * Don't do anything until we see some activity.
502 new_phase(PHASE_DORMANT);
509 if (get_loop_output())
517 * Now we want to bring up the link.
520 info("Starting link");
523 get_time(&start_time);
524 script_unsetenv("CONNECT_TIME");
525 script_unsetenv("BYTES_SENT");
526 script_unsetenv("BYTES_RCVD");
528 lcp_open(0); /* Start protocol */
530 while (phase != PHASE_DEAD) {
534 lcp_close(0, "User request");
536 bundle_terminating = 1;
537 if (phase == PHASE_MASTER)
538 mp_bundle_terminated();
541 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
542 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
543 (*ccp_protent.open)(0);
547 /* restore FSMs to original state */
550 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
555 t = need_holdoff? holdoff: 0;
557 t = (*holdoff_hook)();
559 new_phase(PHASE_HOLDOFF);
560 TIMEOUT(holdoff_end, NULL, t);
564 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
565 } while (phase == PHASE_HOLDOFF);
571 /* Wait for scripts to finish */
573 if (n_children > 0) {
575 TIMEOUT(childwait_end, NULL, child_wait);
577 struct subprocess *chp;
578 dbglog("Waiting for %d child processes...", n_children);
579 for (chp = children; chp != NULL; chp = chp->next)
580 dbglog(" script %s, pid %d", chp->prog, chp->pid);
582 while (n_children > 0 && !childwait_done) {
584 if (kill_link && !childwait_done)
594 * handle_events - wait for something to happen and respond to it.
600 unsigned char buf[16];
602 kill_link = open_ccp_flag = 0;
604 /* alert via signal pipe */
606 /* flush signal pipe */
607 for (; read(sigpipe[0], buf, sizeof(buf)) > 0; );
609 /* wait if necessary */
610 if (!(got_sighup || got_sigterm || got_sigusr2 || got_sigchld))
611 wait_input(timeleft(&timo));
613 remove_fd(sigpipe[0]);
617 info("Hangup (SIGHUP)");
620 if (status != EXIT_HANGUP)
621 status = EXIT_USER_REQUEST;
624 info("Terminating on signal %d", got_sigterm);
628 status = EXIT_USER_REQUEST;
633 reap_kids(); /* Don't leave dead kids lying around */
642 * setup_signals - initialize signal handling.
649 /* create pipe to wake up event handler from signal handler */
650 if (pipe(sigpipe) < 0)
651 fatal("Couldn't create signal pipe: %m");
652 fcntl(sigpipe[0], F_SETFD, fcntl(sigpipe[0], F_GETFD) | FD_CLOEXEC);
653 fcntl(sigpipe[1], F_SETFD, fcntl(sigpipe[1], F_GETFD) | FD_CLOEXEC);
654 fcntl(sigpipe[0], F_SETFL, fcntl(sigpipe[0], F_GETFL) | O_NONBLOCK);
655 fcntl(sigpipe[1], F_SETFL, fcntl(sigpipe[1], F_GETFL) | O_NONBLOCK);
658 * Compute mask of all interesting signals and install signal handlers
659 * for each. Only one signal handler may be active at a time. Therefore,
660 * all other signals should be masked when any handler is executing.
662 sigemptyset(&signals_handled);
663 sigaddset(&signals_handled, SIGHUP);
664 sigaddset(&signals_handled, SIGINT);
665 sigaddset(&signals_handled, SIGTERM);
666 sigaddset(&signals_handled, SIGCHLD);
667 sigaddset(&signals_handled, SIGUSR2);
669 #define SIGNAL(s, handler) do { \
670 sa.sa_handler = handler; \
671 if (sigaction(s, &sa, NULL) < 0) \
672 fatal("Couldn't establish signal handler (%d): %m", s); \
675 sa.sa_mask = signals_handled;
677 SIGNAL(SIGHUP, hup); /* Hangup */
678 SIGNAL(SIGINT, term); /* Interrupt */
679 SIGNAL(SIGTERM, term); /* Terminate */
680 SIGNAL(SIGCHLD, chld);
682 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
683 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
686 * Install a handler for other signals which would otherwise
687 * cause pppd to exit without cleaning up.
689 SIGNAL(SIGABRT, bad_signal);
690 SIGNAL(SIGALRM, bad_signal);
691 SIGNAL(SIGFPE, bad_signal);
692 SIGNAL(SIGILL, bad_signal);
693 SIGNAL(SIGPIPE, bad_signal);
694 SIGNAL(SIGQUIT, bad_signal);
695 SIGNAL(SIGSEGV, bad_signal);
697 SIGNAL(SIGBUS, bad_signal);
700 SIGNAL(SIGEMT, bad_signal);
703 SIGNAL(SIGPOLL, bad_signal);
706 SIGNAL(SIGPROF, bad_signal);
709 SIGNAL(SIGSYS, bad_signal);
712 SIGNAL(SIGTRAP, bad_signal);
715 SIGNAL(SIGVTALRM, bad_signal);
718 SIGNAL(SIGXCPU, bad_signal);
721 SIGNAL(SIGXFSZ, bad_signal);
725 * Apparently we can get a SIGPIPE when we call syslog, if
726 * syslogd has died and been restarted. Ignoring it seems
729 signal(SIGPIPE, SIG_IGN);
733 * set_ifunit - do things we need to do once we know which ppp
737 set_ifunit(int iskey)
741 if (req_ifname[0] != '\0')
742 slprintf(ifname, sizeof(ifname), "%s", req_ifname);
744 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
745 info("Using interface %s", ifname);
746 script_setenv("IFNAME", ifname, iskey);
747 slprintf(ifkey, sizeof(ifkey), "%d", ifunit);
748 script_setenv("UNIT", ifkey, iskey);
750 create_pidfile(getpid()); /* write pid to file */
751 create_linkpidfile(getpid());
756 * detach - detach us from the controlling terminal.
768 if (pipe(pipefd) == -1)
769 pipefd[0] = pipefd[1] = -1;
770 if ((pid = fork()) < 0) {
771 error("Couldn't detach (fork failed: %m)");
772 die(1); /* or just return? */
776 notify(pidchange, pid);
777 /* update pid files if they have been written already */
780 create_linkpidfile(pid);
781 exit(0); /* parent dies */
786 fatal("Could not change directory to '/', %m");
794 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
795 script_setenv("PPPD_PID", numbuf, 1);
797 /* wait for parent to finish updating pid & lock files and die */
799 complete_read(pipefd[0], numbuf, 1);
804 * reopen_log - (re)open our connection to syslog.
809 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
810 setlogmask(LOG_UPTO(LOG_INFO));
814 * Create a file containing our process ID.
817 create_pidfile(int pid)
821 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
822 PPP_PATH_VARRUN, ifname);
823 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
824 fprintf(pidfile, "%d\n", pid);
825 (void) fclose(pidfile);
827 error("Failed to create pid file %s: %m", pidfilename);
833 create_linkpidfile(int pid)
837 if (linkname[0] == 0)
839 script_setenv("LINKNAME", linkname, 1);
840 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
841 PPP_PATH_VARRUN, linkname);
842 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
843 fprintf(pidfile, "%d\n", pid);
845 fprintf(pidfile, "%s\n", ifname);
846 (void) fclose(pidfile);
848 error("Failed to create pid file %s: %m", linkpidfile);
854 * remove_pidfile - remove our pid files
856 void remove_pidfiles(void)
858 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
859 warn("unable to delete pid file %s: %m", pidfilename);
861 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
862 warn("unable to delete pid file %s: %m", linkpidfile);
867 * holdoff_end - called via a timeout when the holdoff period ends.
870 holdoff_end(void *arg)
872 new_phase(PHASE_DORMANT);
875 /* List of protocol names, to make our messages a little more informative. */
876 struct protocol_list {
879 } protocol_list[] = {
881 { 0x23, "OSI Network Layer" },
882 { 0x25, "Xerox NS IDP" },
883 { 0x27, "DECnet Phase IV" },
884 { 0x29, "Appletalk" },
885 { 0x2b, "Novell IPX" },
886 { 0x2d, "VJ compressed TCP/IP" },
887 { 0x2f, "VJ uncompressed TCP/IP" },
888 { 0x31, "Bridging PDU" },
889 { 0x33, "Stream Protocol ST-II" },
890 { 0x35, "Banyan Vines" },
891 { 0x39, "AppleTalk EDDP" },
892 { 0x3b, "AppleTalk SmartBuffered" },
893 { 0x3d, "Multi-Link" },
894 { 0x3f, "NETBIOS Framing" },
895 { 0x41, "Cisco Systems" },
896 { 0x43, "Ascom Timeplex" },
897 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
898 { 0x47, "DCA Remote Lan" },
899 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
900 { 0x4b, "SNA over 802.2" },
902 { 0x4f, "IP6 Header Compression" },
903 { 0x51, "KNX Bridging Data" },
904 { 0x53, "Encryption" },
905 { 0x55, "Individual Link Encryption" },
907 { 0x59, "PPP Muxing" },
908 { 0x5b, "Vendor-Specific Network Protocol" },
909 { 0x61, "RTP IPHC Full Header" },
910 { 0x63, "RTP IPHC Compressed TCP" },
911 { 0x65, "RTP IPHC Compressed non-TCP" },
912 { 0x67, "RTP IPHC Compressed UDP 8" },
913 { 0x69, "RTP IPHC Compressed RTP 8" },
914 { 0x6f, "Stampede Bridging" },
916 { 0xc1, "NTCITS IPI" },
917 { 0xfb, "single-link compression" },
918 { 0xfd, "Compressed Datagram" },
919 { 0x0201, "802.1d Hello Packets" },
920 { 0x0203, "IBM Source Routing BPDU" },
921 { 0x0205, "DEC LANBridge100 Spanning Tree" },
922 { 0x0207, "Cisco Discovery Protocol" },
923 { 0x0209, "Netcs Twin Routing" },
924 { 0x020b, "STP - Scheduled Transfer Protocol" },
925 { 0x020d, "EDP - Extreme Discovery Protocol" },
926 { 0x0211, "Optical Supervisory Channel Protocol" },
927 { 0x0213, "Optical Supervisory Channel Protocol" },
928 { 0x0231, "Luxcom" },
929 { 0x0233, "Sigma Network Systems" },
930 { 0x0235, "Apple Client Server Protocol" },
931 { 0x0281, "MPLS Unicast" },
932 { 0x0283, "MPLS Multicast" },
933 { 0x0285, "IEEE p1284.4 standard - data packets" },
934 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
935 { 0x0289, "Multichannel Flow Treatment Protocol" },
936 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
937 { 0x2065, "RTP IPHC Context State" },
938 { 0x2067, "RTP IPHC Compressed UDP 16" },
939 { 0x2069, "RTP IPHC Compressed RTP 16" },
940 { 0x4001, "Cray Communications Control Protocol" },
941 { 0x4003, "CDPD Mobile Network Registration Protocol" },
942 { 0x4005, "Expand accelerator protocol" },
943 { 0x4007, "ODSICP NCP" },
944 { 0x4009, "DOCSIS DLL" },
945 { 0x400B, "Cetacean Network Detection Protocol" },
946 { 0x4021, "Stacker LZS" },
947 { 0x4023, "RefTek Protocol" },
948 { 0x4025, "Fibre Channel" },
949 { 0x4027, "EMIT Protocols" },
950 { 0x405b, "Vendor-Specific Protocol (VSP)" },
951 { 0x8021, "Internet Protocol Control Protocol" },
952 { 0x8023, "OSI Network Layer Control Protocol" },
953 { 0x8025, "Xerox NS IDP Control Protocol" },
954 { 0x8027, "DECnet Phase IV Control Protocol" },
955 { 0x8029, "Appletalk Control Protocol" },
956 { 0x802b, "Novell IPX Control Protocol" },
957 { 0x8031, "Bridging NCP" },
958 { 0x8033, "Stream Protocol Control Protocol" },
959 { 0x8035, "Banyan Vines Control Protocol" },
960 { 0x803d, "Multi-Link Control Protocol" },
961 { 0x803f, "NETBIOS Framing Control Protocol" },
962 { 0x8041, "Cisco Systems Control Protocol" },
963 { 0x8043, "Ascom Timeplex" },
964 { 0x8045, "Fujitsu LBLB Control Protocol" },
965 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
966 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
967 { 0x804b, "SNA over 802.2 Control Protocol" },
968 { 0x804d, "SNA Control Protocol" },
969 { 0x804f, "IP6 Header Compression Control Protocol" },
970 { 0x8051, "KNX Bridging Control Protocol" },
971 { 0x8053, "Encryption Control Protocol" },
972 { 0x8055, "Individual Link Encryption Control Protocol" },
973 { 0x8057, "IPv6 Control Protocol" },
974 { 0x8059, "PPP Muxing Control Protocol" },
975 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
976 { 0x806f, "Stampede Bridging Control Protocol" },
977 { 0x8073, "MP+ Control Protocol" },
978 { 0x80c1, "NTCITS IPI Control Protocol" },
979 { 0x80fb, "Single Link Compression Control Protocol" },
980 { 0x80fd, "Compression Control Protocol" },
981 { 0x8207, "Cisco Discovery Protocol Control" },
982 { 0x8209, "Netcs Twin Routing" },
983 { 0x820b, "STP - Control Protocol" },
984 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
985 { 0x8235, "Apple Client Server Protocol Control" },
986 { 0x8281, "MPLSCP" },
987 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
988 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
989 { 0x8289, "Multichannel Flow Treatment Protocol" },
990 { 0xc021, "Link Control Protocol" },
991 { 0xc023, "Password Authentication Protocol" },
992 { 0xc025, "Link Quality Report" },
993 { 0xc027, "Shiva Password Authentication Protocol" },
994 { 0xc029, "CallBack Control Protocol (CBCP)" },
995 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
997 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
998 { 0xc081, "Container Control Protocol" },
999 { 0xc223, "Challenge Handshake Authentication Protocol" },
1000 { 0xc225, "RSA Authentication Protocol" },
1001 { 0xc227, "Extensible Authentication Protocol" },
1002 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1003 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1004 { 0xc281, "Proprietary Authentication Protocol" },
1005 { 0xc283, "Proprietary Authentication Protocol" },
1006 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1011 * protocol_name - find a name for a PPP protocol.
1014 protocol_name(int proto)
1016 struct protocol_list *lp;
1018 for (lp = protocol_list; lp->proto != 0; ++lp)
1019 if (proto == lp->proto)
1025 * get_input - called when incoming data is available.
1033 struct protent *protp;
1035 p = inpacket_buf; /* point to beginning of packet buffer */
1037 len = read_packet(inpacket_buf);
1042 if (bundle_eof && multilink_master) {
1043 notice("Last channel has disconnected");
1044 mp_bundle_terminated();
1047 notice("Modem hangup");
1049 status = EXIT_HANGUP;
1050 lcp_lowerdown(0); /* serial link is no longer available */
1055 if (len < PPP_HDRLEN) {
1056 dbglog("received short packet:%.*B", len, p);
1060 dump_packet("rcvd", p, len);
1061 if (snoop_recv_hook) snoop_recv_hook(p, len);
1063 p += 2; /* Skip address and control */
1064 GETSHORT(protocol, p);
1068 * Toss all non-LCP packets unless LCP is OPEN.
1070 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1071 dbglog("Discarded non-LCP packet when LCP not open");
1076 * Until we get past the authentication phase, toss all packets
1077 * except LCP, LQR and authentication packets.
1079 if (phase <= PHASE_AUTHENTICATE
1080 && !(protocol == PPP_LCP || protocol == PPP_LQR
1081 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1082 protocol == PPP_EAP)) {
1083 dbglog("discarding proto 0x%x in phase %d",
1089 * Upcall the proper protocol input routine.
1091 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1092 if (protp->protocol == protocol && protp->enabled_flag) {
1093 (*protp->input)(0, p, len);
1096 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1097 && protp->datainput != NULL) {
1098 (*protp->datainput)(0, p, len);
1104 const char *pname = protocol_name(protocol);
1106 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1108 warn("Unsupported protocol 0x%x received", protocol);
1110 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1114 * ppp_send_config - configure the transmit-side characteristics of
1115 * the ppp interface. Returns -1, indicating an error, if the channel
1116 * send_config procedure called error() (or incremented error_count
1117 * itself), otherwise 0.
1120 ppp_send_config(int unit, int mtu, u_int32_t accm, int pcomp, int accomp)
1124 if (the_channel->send_config == NULL)
1127 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1128 return (error_count != errs)? -1: 0;
1132 * ppp_recv_config - configure the receive-side characteristics of
1133 * the ppp interface. Returns -1, indicating an error, if the channel
1134 * recv_config procedure called error() (or incremented error_count
1135 * itself), otherwise 0.
1138 ppp_recv_config(int unit, int mru, u_int32_t accm, int pcomp, int accomp)
1142 if (the_channel->recv_config == NULL)
1145 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1146 return (error_count != errs)? -1: 0;
1150 * new_phase - signal the start of a new phase of pppd's operation.
1157 (*new_phase_hook)(p);
1158 notify(phasechange, p);
1162 * die - clean up state and exit with the specified status.
1167 if (!doing_multilink || multilink_master)
1170 notify(exitnotify, status);
1171 syslog(LOG_INFO, "Exit.");
1176 * cleanup - restore anything which needs to be restored before we exit
1185 the_channel->disestablish_ppp(devfd);
1186 if (the_channel->cleanup)
1187 (*the_channel->cleanup)();
1198 print_link_stats(void)
1201 * Print connect time and statistics.
1203 if (link_stats_valid) {
1204 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1205 info("Connect time %d.%d minutes.", t/10, t%10);
1206 info("Sent %u bytes, received %u bytes.",
1207 link_stats.bytes_out, link_stats.bytes_in);
1208 link_stats_valid = 0;
1213 * reset_link_stats - "reset" stats when link goes up.
1216 reset_link_stats(int u)
1218 if (!get_ppp_stats(u, &old_link_stats))
1220 get_time(&start_time);
1224 * update_link_stats - get stats at link termination.
1227 update_link_stats(int u)
1232 if (!get_ppp_stats(u, &link_stats)
1233 || get_time(&now) < 0)
1235 link_connect_time = now.tv_sec - start_time.tv_sec;
1236 link_stats_valid = 1;
1238 link_stats.bytes_in -= old_link_stats.bytes_in;
1239 link_stats.bytes_out -= old_link_stats.bytes_out;
1240 link_stats.pkts_in -= old_link_stats.pkts_in;
1241 link_stats.pkts_out -= old_link_stats.pkts_out;
1243 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1244 script_setenv("CONNECT_TIME", numbuf, 0);
1245 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_out);
1246 script_setenv("BYTES_SENT", numbuf, 0);
1247 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_in);
1248 script_setenv("BYTES_RCVD", numbuf, 0);
1253 struct timeval c_time; /* time at which to call routine */
1254 void *c_arg; /* argument to routine */
1255 void (*c_func)(void *); /* routine */
1256 struct callout *c_next;
1259 static struct callout *callout = NULL; /* Callout list */
1260 static struct timeval timenow; /* Current time */
1263 * timeout - Schedule a timeout.
1266 timeout(void (*func)(void *), void *arg, int secs, int usecs)
1268 struct callout *newp, *p, **pp;
1273 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1274 fatal("Out of memory in timeout()!");
1276 newp->c_func = func;
1278 newp->c_time.tv_sec = timenow.tv_sec + secs;
1279 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1280 if (newp->c_time.tv_usec >= 1000000) {
1281 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1282 newp->c_time.tv_usec %= 1000000;
1286 * Find correct place and link it in.
1288 for (pp = &callout; (p = *pp); pp = &p->c_next)
1289 if (newp->c_time.tv_sec < p->c_time.tv_sec
1290 || (newp->c_time.tv_sec == p->c_time.tv_sec
1291 && newp->c_time.tv_usec < p->c_time.tv_usec))
1299 * untimeout - Unschedule a timeout.
1302 untimeout(void (*func)(void *), void *arg)
1304 struct callout **copp, *freep;
1307 * Find first matching timeout and remove it from the list.
1309 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1310 if (freep->c_func == func && freep->c_arg == arg) {
1311 *copp = freep->c_next;
1312 free((char *) freep);
1319 * calltimeout - Call any timeout routines which are now due.
1326 while (callout != NULL) {
1329 if (get_time(&timenow) < 0)
1330 fatal("Failed to get time of day: %m");
1331 if (!(p->c_time.tv_sec < timenow.tv_sec
1332 || (p->c_time.tv_sec == timenow.tv_sec
1333 && p->c_time.tv_usec <= timenow.tv_usec)))
1334 break; /* no, it's not time yet */
1336 callout = p->c_next;
1337 (*p->c_func)(p->c_arg);
1345 * timeleft - return the length of time until the next timeout is due.
1347 static struct timeval *
1348 timeleft(struct timeval *tvp)
1350 if (callout == NULL)
1354 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1355 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1356 if (tvp->tv_usec < 0) {
1357 tvp->tv_usec += 1000000;
1360 if (tvp->tv_sec < 0)
1361 tvp->tv_sec = tvp->tv_usec = 0;
1368 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1369 * We assume that sig is currently blocked.
1374 struct sigaction act, oldact;
1375 struct subprocess *chp;
1379 * There might be other things in our process group that we
1380 * didn't start that would get hit if we did a kill(0), so
1381 * just send the signal individually to our children.
1383 for (chp = children; chp != NULL; chp = chp->next)
1385 kill(chp->pid, sig);
1389 /* We've done a setsid(), so we can just use a kill(0) */
1390 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1391 act.sa_handler = SIG_IGN;
1395 * The kill() above made the signal pending for us, as well as
1396 * the rest of our process group, but we don't want it delivered
1397 * to us. It is blocked at the moment. Setting it to be ignored
1398 * will cause the pending signal to be discarded. If we did the
1399 * kill() after setting the signal to be ignored, it is unspecified
1400 * (by POSIX) whether the signal is immediately discarded or left
1401 * pending, and in fact Linux would leave it pending, and so it
1402 * would be delivered after the current signal handler exits,
1403 * leading to an infinite loop.
1405 sigaction(sig, &act, &oldact);
1406 sigaction(sig, &oldact, NULL);
1411 * hup - Catch SIGHUP signal.
1413 * Indicates that the physical layer has been disconnected.
1414 * We don't rely on this indication; if the user has sent this
1415 * signal, we just take the link down.
1420 /* can't log a message here, it can deadlock */
1423 /* Send the signal to the [dis]connector process(es) also */
1425 notify(sigreceived, sig);
1427 #pragma GCC diagnostic push
1428 #pragma GCC diagnostic ignored "-Wunused-result"
1429 write(sigpipe[1], &sig, sizeof(sig));
1430 #pragma GCC diagnostic pop
1436 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1438 * Indicates that we should initiate a graceful disconnect and exit.
1444 /* can't log a message here, it can deadlock */
1447 /* Send the signal to the [dis]connector process(es) also */
1449 notify(sigreceived, sig);
1451 #pragma GCC diagnostic push
1452 #pragma GCC diagnostic ignored "-Wunused-result"
1453 write(sigpipe[1], &sig, sizeof(sig));
1454 #pragma GCC diagnostic pop
1460 * chld - Catch SIGCHLD signal.
1461 * Sets a flag so we will call reap_kids in the mainline.
1468 #pragma GCC diagnostic push
1469 #pragma GCC diagnostic ignored "-Wunused-result"
1470 write(sigpipe[1], &sig, sizeof(sig));
1471 #pragma GCC diagnostic pop
1477 * toggle_debug - Catch SIGUSR1 signal.
1479 * Toggle debug flag.
1483 toggle_debug(int sig)
1487 setlogmask(LOG_UPTO(LOG_DEBUG));
1489 setlogmask(LOG_UPTO(LOG_WARNING));
1495 * open_ccp - Catch SIGUSR2 signal.
1497 * Try to (re)negotiate compression.
1505 #pragma GCC diagnostic push
1506 #pragma GCC diagnostic ignored "-Wunused-result"
1507 write(sigpipe[1], &sig, sizeof(sig));
1508 #pragma GCC diagnostic pop
1514 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1519 static int crashed = 0;
1524 error("Fatal signal %d", sig);
1526 kill_my_pg(SIGTERM);
1527 notify(sigreceived, sig);
1532 * safe_fork - Create a child process. The child closes all the
1533 * file descriptors that we don't want to leak to a script.
1534 * The parent waits for the child to do this before returning.
1535 * This also arranges for the specified fds to be dup'd to
1536 * fds 0, 1, 2 in the child.
1539 safe_fork(int infd, int outfd, int errfd)
1545 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1546 while ((fd = dup(fd_devnull)) >= 0) {
1553 if (pipe(pipefd) == -1)
1554 pipefd[0] = pipefd[1] = -1;
1557 error("fork failed: %m");
1563 /* this read() blocks until the close(pipefd[1]) below */
1564 complete_read(pipefd[0], buf, 1);
1569 /* Executing in the child */
1576 /* make sure infd, outfd and errfd won't get tromped on below */
1577 if (infd == 1 || infd == 2)
1579 if (outfd == 0 || outfd == 2)
1581 if (errfd == 0 || errfd == 1)
1586 /* dup the in, out, err fds to 0, 1, 2 */
1596 if (the_channel->close)
1597 (*the_channel->close)();
1599 close(devfd); /* some plugins don't have a close function */
1609 notify(fork_notifier, 0);
1611 /* this close unblocks the read() call above in the parent */
1618 add_script_env(int pos, char *newstring)
1620 if (pos + 1 >= s_env_nalloc) {
1621 int new_n = pos + 17;
1622 char **newenv = realloc(script_env, new_n * sizeof(char *));
1623 if (newenv == NULL) {
1624 free(newstring - 1);
1627 script_env = newenv;
1628 s_env_nalloc = new_n;
1630 script_env[pos] = newstring;
1631 script_env[pos + 1] = NULL;
1636 remove_script_env(int pos)
1638 free(script_env[pos] - 1);
1639 while ((script_env[pos] = script_env[pos + 1]) != NULL)
1644 * update_system_environment - process the list of set/unset options
1645 * and update the system environment.
1648 update_system_environment(void)
1650 struct userenv *uep;
1652 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1654 setenv(uep->ue_name, uep->ue_value, 1);
1656 unsetenv(uep->ue_name);
1661 * device_script - run a program to talk to the specified fds
1662 * (e.g. to run the connector or disconnector script).
1663 * stderr gets connected to the log fd or to the PPP_PATH_CONNERRS file.
1666 device_script(char *program, int in, int out, int dont_wait)
1676 errfd = open(PPP_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0644);
1679 pid = safe_fork(in, out, errfd);
1681 if (pid != 0 && log_to_fd < 0)
1686 error("Failed to create child process: %m");
1691 record_child(pid, program, NULL, NULL, 1);
1694 while (waitpid(pid, &status, 0) < 0) {
1697 fatal("error waiting for (dis)connection process: %m");
1699 forget_child(pid, status);
1702 return (status == 0 ? 0 : -1);
1705 /* here we are executing in the child */
1706 ret = setgid(getgid());
1708 perror("pppd: setgid failed\n");
1712 if (ret != 0 || getuid() != uid) {
1713 perror("pppd: setuid failed\n");
1716 update_system_environment();
1717 execl("/bin/sh", "sh", "-c", program, (char *)0);
1718 perror("pppd: could not exec /bin/sh");
1725 * update_script_environment - process the list of set/unset options
1726 * and update the script environment. Note that we intentionally do
1727 * not update the TDB. These changes are layered on top right before
1728 * exec. It is not possible to use script_setenv() or
1729 * script_unsetenv() safely after this routine is run.
1732 update_script_environment(void)
1734 struct userenv *uep;
1736 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1738 char *p, *newstring;
1739 int nlen = strlen(uep->ue_name);
1741 for (i = 0; (p = script_env[i]) != NULL; i++) {
1742 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=')
1745 if (uep->ue_isset) {
1746 nlen += strlen(uep->ue_value) + 2;
1747 newstring = malloc(nlen + 1);
1748 if (newstring == NULL)
1751 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value);
1753 script_env[i] = newstring;
1755 add_script_env(i, newstring);
1756 } else if (p != NULL) {
1757 remove_script_env(i);
1763 * run_program - execute a program with given arguments,
1764 * but don't wait for it unless wait is non-zero.
1765 * If the program can't be executed, logs an error unless
1766 * must_exist is 0 and the program file doesn't exist.
1767 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1768 * or isn't an executable plain file, or the process ID of the child.
1769 * If done != NULL, (*done)(arg) will be called later (within
1770 * reap_kids) iff the return value is > 0.
1773 run_program(char *prog, char **args, int must_exist, void (*done)(void *), void *arg, int wait)
1775 int pid, status, ret;
1779 * First check if the file exists and is executable.
1780 * We don't use access() because that would use the
1781 * real user-id, which might not be root, and the script
1782 * might be accessible only to root.
1785 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1786 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1787 if (must_exist || errno != ENOENT)
1788 warn("Can't execute %s: %m", prog);
1792 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1794 error("Failed to create child process for %s: %m", prog);
1799 dbglog("Script %s started (pid %d)", prog, pid);
1800 record_child(pid, prog, done, arg, 0);
1802 while (waitpid(pid, &status, 0) < 0) {
1805 fatal("error waiting for script %s: %m", prog);
1807 forget_child(pid, status);
1812 /* Leave the current location */
1813 (void) setsid(); /* No controlling tty. */
1814 (void) umask (S_IRWXG|S_IRWXO);
1815 ret = chdir ("/"); /* no current directory. */
1817 fatal("Failed to change directory to '/', %m");
1819 ret = setuid(0); /* set real UID = root */
1821 fatal("Failed to set uid, %m");
1823 ret = setgid(getegid());
1825 fatal("failed to set gid, %m");
1829 /* Force the priority back to zero if pppd is running higher. */
1830 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1831 warn("can't reset priority to 0: %m");
1834 /* run the program */
1835 update_script_environment();
1836 execve(prog, args, script_env);
1837 if (must_exist || errno != ENOENT) {
1838 /* have to reopen the log, there's nowhere else
1839 for the message to go. */
1841 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1849 * record_child - add a child process to the list for reap_kids
1853 record_child(int pid, char *prog, void (*done)(void *), void *arg, int killable)
1855 struct subprocess *chp;
1859 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1861 warn("losing track of %s process", prog);
1867 chp->next = children;
1868 chp->killable = killable;
1874 * childwait_end - we got fed up waiting for the child processes to
1875 * exit, send them all a SIGTERM.
1878 childwait_end(void *arg)
1880 struct subprocess *chp;
1882 for (chp = children; chp != NULL; chp = chp->next) {
1884 dbglog("sending SIGTERM to process %d", chp->pid);
1885 kill(chp->pid, SIGTERM);
1891 * forget_child - clean up after a dead child
1894 forget_child(int pid, int status)
1896 struct subprocess *chp, **prevp;
1898 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1899 if (chp->pid == pid) {
1905 if (WIFSIGNALED(status)) {
1906 warn("Child process %s (pid %d) terminated with signal %d",
1907 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1909 dbglog("Script %s finished (pid %d), status = 0x%x",
1910 (chp? chp->prog: "??"), pid,
1911 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1912 if (chp && chp->done)
1913 (*chp->done)(chp->arg);
1919 * reap_kids - get status from any dead child processes,
1920 * and log a message for abnormal terminations.
1927 if (n_children == 0)
1929 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
1930 forget_child(pid, status);
1933 if (errno == ECHILD)
1936 error("Error waiting for child process: %m");
1942 * add_notifier - add a new function to be called when something happens.
1945 add_notifier(struct notifier **notif, notify_func func, void *arg)
1947 struct notifier *np;
1949 np = malloc(sizeof(struct notifier));
1951 novm("notifier struct");
1959 * remove_notifier - remove a function from the list of things to
1960 * be called when something happens.
1963 remove_notifier(struct notifier **notif, notify_func func, void *arg)
1965 struct notifier *np;
1967 for (; (np = *notif) != 0; notif = &np->next) {
1968 if (np->func == func && np->arg == arg) {
1977 * notify - call a set of functions registered with add_notifier.
1980 notify(struct notifier *notif, int val)
1982 struct notifier *np;
1984 while ((np = notif) != 0) {
1986 (*np->func)(np->arg, val);
1991 * novm - log an error message saying we ran out of memory, and die.
1996 fatal("Virtual memory exhausted allocating %s\n", msg);
2000 * script_setenv - set an environment variable value to be used
2001 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2004 script_setenv(char *var, char *value, int iskey)
2006 size_t varl = strlen(var);
2007 size_t vl = varl + strlen(value) + 2;
2009 char *p, *newstring;
2011 newstring = (char *) malloc(vl+1);
2014 *newstring++ = iskey;
2015 slprintf(newstring, vl, "%s=%s", var, value);
2017 /* check if this variable is already set */
2018 if (script_env != 0) {
2019 for (i = 0; (p = script_env[i]) != 0; ++i) {
2020 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2022 if (p[-1] && pppdb != NULL)
2026 script_env[i] = newstring;
2028 if (pppdb != NULL) {
2030 add_db_key(newstring);
2038 /* no space allocated for script env. ptrs. yet */
2040 script_env = malloc(16 * sizeof(char *));
2041 if (script_env == 0) {
2042 free(newstring - 1);
2048 if (!add_script_env(i, newstring))
2052 if (pppdb != NULL) {
2054 add_db_key(newstring);
2061 * script_unsetenv - remove a variable from the environment
2065 script_unsetenv(char *var)
2067 int vl = strlen(var);
2071 if (script_env == 0)
2073 for (i = 0; (p = script_env[i]) != 0; ++i) {
2074 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2076 if (p[-1] && pppdb != NULL)
2079 remove_script_env(i);
2090 * Any arbitrary string used as a key for locking the database.
2091 * It doesn't matter what it is as long as all pppds use the same string.
2093 #define PPPD_LOCK_KEY "pppd lock"
2096 * lock_db - get an exclusive lock on the TDB database.
2097 * Used to ensure atomicity of various lookup/modify operations.
2104 key.dptr = PPPD_LOCK_KEY;
2105 key.dsize = strlen(key.dptr);
2106 tdb_chainlock(pppdb, key);
2111 * unlock_db - remove the exclusive lock obtained by lock_db.
2113 void unlock_db(void)
2118 key.dptr = PPPD_LOCK_KEY;
2119 key.dsize = strlen(key.dptr);
2120 tdb_chainunlock(pppdb, key);
2126 * update_db_entry - update our entry in the database.
2129 update_db_entry(void)
2135 if (script_env == NULL)
2138 for (i = 0; (p = script_env[i]) != 0; ++i)
2139 vlen += strlen(p) + 1;
2140 vbuf = malloc(vlen + 1);
2142 novm("database entry");
2144 for (i = 0; (p = script_env[i]) != 0; ++i)
2145 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2148 key.dsize = strlen(db_key);
2151 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2152 error("tdb_store failed: %s", tdb_errorstr(pppdb));
2160 * add_db_key - add a key that we can use to look up our database entry.
2163 add_db_key(const char *str)
2167 key.dptr = (char *) str;
2168 key.dsize = strlen(str);
2170 dbuf.dsize = strlen(db_key);
2171 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2172 error("tdb_store key failed: %s", tdb_errorstr(pppdb));
2176 * delete_db_key - delete a key for looking up our database entry.
2179 delete_db_key(const char *str)
2183 key.dptr = (char *) str;
2184 key.dsize = strlen(str);
2185 tdb_delete(pppdb, key);
2189 * cleanup_db - delete all the entries we put in the database.
2199 key.dsize = strlen(db_key);
2200 tdb_delete(pppdb, key);
2201 for (i = 0; (p = script_env[i]) != 0; ++i)
2205 #endif /* PPP_WITH_TDB */