1 /*
2 * main.c - Point-to-Point Protocol main module
3 *
4 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
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
16 * distribution.
17 *
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
24 * 5000 Forbes Avenue
25 * Pittsburgh, PA 15213-3890
26 * (412) 268-4387, fax: (412) 268-7395
27 * tech-transfer@andrew.cmu.edu
28 *
29 * 4. Redistributions of any form whatsoever must retain the following
30 * acknowledgment:
31 * "This product includes software developed by Computing Services
32 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
33 *
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.
41 *
42 * Copyright (c) 1999-2004 Paul Mackerras. All rights reserved.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 *
48 * 1. Redistributions of source code must retain the above copyright
49 * notice, this list of conditions and the following disclaimer.
50 *
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.
54 *
55 * 3. Redistributions of any form whatsoever must retain the following
56 * acknowledgment:
57 * "This product includes software developed by Paul Mackerras
58 * <paulus@samba.org>".
59 *
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.
67 */
68
69 #define RCSID "$Id: main.c,v 1.156 2008/06/23 11:47:18 paulus Exp $"
70
71 #include <stdio.h>
72 #include <ctype.h>
73 #include <stdlib.h>
74 #include <string.h>
75 #include <unistd.h>
76 #include <signal.h>
77 #include <errno.h>
78 #include <fcntl.h>
79 #include <syslog.h>
80 #include <netdb.h>
81 #include <utmp.h>
82 #include <pwd.h>
83 #include <setjmp.h>
84 #include <sys/param.h>
85 #include <sys/types.h>
86 #include <sys/wait.h>
87 #include <sys/time.h>
88 #include <sys/resource.h>
89 #include <sys/stat.h>
90 #include <sys/socket.h>
91 #include <netinet/in.h>
92 #include <arpa/inet.h>
93 #if defined(__ANDROID__)
94 #include <cutils/properties.h>
95 #endif
96
97 #include "pppd.h"
98 #include "magic.h"
99 #include "fsm.h"
100 #include "lcp.h"
101 #include "ipcp.h"
102 #ifdef INET6
103 #include "ipv6cp.h"
104 #endif
105 #include "upap.h"
106 #include "chap-new.h"
107 #include "eap.h"
108 #include "ccp.h"
109 #include "ecp.h"
110 #include "pathnames.h"
111
112 #ifdef USE_TDB
113 #include "tdb.h"
114 #endif
115
116 #ifdef CBCP_SUPPORT
117 #include "cbcp.h"
118 #endif
119
120 #ifdef IPX_CHANGE
121 #include "ipxcp.h"
122 #endif /* IPX_CHANGE */
123 #ifdef AT_CHANGE
124 #include "atcp.h"
125 #endif
126
127 static const char rcsid[] = RCSID;
128
129 /* interface vars */
130 char ifname[32]; /* Interface name */
131 int ifunit; /* Interface unit number */
132
133 struct channel *the_channel;
134
135 char *progname; /* Name of this program */
136 char hostname[MAXNAMELEN]; /* Our hostname */
137 static char pidfilename[MAXPATHLEN]; /* name of pid file */
138 static char linkpidfile[MAXPATHLEN]; /* name of linkname pid file */
139 char ppp_devnam[MAXPATHLEN]; /* name of PPP tty (maybe ttypx) */
140 uid_t uid; /* Our real user-id */
141 struct notifier *pidchange = NULL;
142 struct notifier *phasechange = NULL;
143 struct notifier *exitnotify = NULL;
144 struct notifier *sigreceived = NULL;
145 struct notifier *fork_notifier = NULL;
146
147 int hungup; /* terminal has been hung up */
148 int privileged; /* we're running as real uid root */
149 int need_holdoff; /* need holdoff period before restarting */
150 int detached; /* have detached from terminal */
151 volatile int status; /* exit status for pppd */
152 int unsuccess; /* # unsuccessful connection attempts */
153 int do_callback; /* != 0 if we should do callback next */
154 int doing_callback; /* != 0 if we are doing callback */
155 int ppp_session_number; /* Session number, for channels with such a
156 concept (eg PPPoE) */
157 int childwait_done; /* have timed out waiting for children */
158
159 #ifdef USE_TDB
160 TDB_CONTEXT *pppdb; /* database for storing status etc. */
161 #endif
162
163 char db_key[32];
164
165 int (*holdoff_hook) __P((void)) = NULL;
166 int (*new_phase_hook) __P((int)) = NULL;
167 void (*snoop_recv_hook) __P((unsigned char *p, int len)) = NULL;
168 void (*snoop_send_hook) __P((unsigned char *p, int len)) = NULL;
169
170 static int conn_running; /* we have a [dis]connector running */
171 static int fd_loop; /* fd for getting demand-dial packets */
172
173 int fd_devnull; /* fd for /dev/null */
174 int devfd = -1; /* fd of underlying device */
175 int fd_ppp = -1; /* fd for talking PPP */
176 int phase; /* where the link is at */
177 int kill_link;
178 int asked_to_quit;
179 int open_ccp_flag;
180 int listen_time;
181 int got_sigusr2;
182 int got_sigterm;
183 int got_sighup;
184
185 static sigset_t signals_handled;
186 static int waiting;
187 static sigjmp_buf sigjmp;
188
189 char **script_env; /* Env. variable values for scripts */
190 int s_env_nalloc; /* # words avail at script_env */
191
192 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
193 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
194
195 static int n_children; /* # child processes still running */
196 static int got_sigchld; /* set if we have received a SIGCHLD */
197
198 int privopen; /* don't lock, open device as root */
199
200 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
201
202 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
203 int ngroups; /* How many groups valid in groups */
204
205 static struct timeval start_time; /* Time when link was started. */
206
207 static struct pppd_stats old_link_stats;
208 struct pppd_stats link_stats;
209 unsigned link_connect_time;
210 int link_stats_valid;
211
212 int error_count;
213
214 bool bundle_eof;
215 bool bundle_terminating;
216
217 /*
218 * We maintain a list of child process pids and
219 * functions to call when they exit.
220 */
221 struct subprocess {
222 pid_t pid;
223 char *prog;
224 void (*done) __P((void *));
225 void *arg;
226 int killable;
227 struct subprocess *next;
228 };
229
230 static struct subprocess *children;
231
232 /* Prototypes for procedures local to this file. */
233
234 static void setup_signals __P((void));
235 static void create_pidfile __P((int pid));
236 static void create_linkpidfile __P((int pid));
237 static void cleanup __P((void));
238 static void get_input __P((void));
239 static void calltimeout __P((void));
240 static struct timeval *timeleft __P((struct timeval *));
241 static void kill_my_pg __P((int));
242 static void hup __P((int));
243 static void term __P((int));
244 static void chld __P((int));
245 static void toggle_debug __P((int));
246 static void open_ccp __P((int));
247 static void bad_signal __P((int));
248 static void holdoff_end __P((void *));
249 static void forget_child __P((int pid, int status));
250 static int reap_kids __P((void));
251 static void childwait_end __P((void *));
252
253 #ifdef USE_TDB
254 static void update_db_entry __P((void));
255 static void add_db_key __P((const char *));
256 static void delete_db_key __P((const char *));
257 static void cleanup_db __P((void));
258 #endif
259
260 static void handle_events __P((void));
261 void print_link_stats __P((void));
262
263 extern char *ttyname __P((int));
264 extern char *getlogin __P((void));
265 int main __P((int, char *[]));
266
267 #ifdef ultrix
268 #undef O_NONBLOCK
269 #define O_NONBLOCK O_NDELAY
270 #endif
271
272 #ifdef ULTRIX
273 #define setlogmask(x)
274 #endif
275
276 /*
277 * PPP Data Link Layer "protocol" table.
278 * One entry per supported protocol.
279 * The last entry must be NULL.
280 */
281 struct protent *protocols[] = {
282 &lcp_protent,
283 &pap_protent,
284 &chap_protent,
285 #ifdef CBCP_SUPPORT
286 &cbcp_protent,
287 #endif
288 &ipcp_protent,
289 #ifdef INET6
290 &ipv6cp_protent,
291 #endif
292 &ccp_protent,
293 &ecp_protent,
294 #ifdef IPX_CHANGE
295 &ipxcp_protent,
296 #endif
297 #ifdef AT_CHANGE
298 &atcp_protent,
299 #endif
300 &eap_protent,
301 NULL
302 };
303
304 /*
305 * If PPP_DRV_NAME is not defined, use the default "ppp" as the device name.
306 */
307 #if !defined(PPP_DRV_NAME)
308 #define PPP_DRV_NAME "ppp"
309 #endif /* !defined(PPP_DRV_NAME) */
310
311 int
main(argc,argv)312 main(argc, argv)
313 int argc;
314 char *argv[];
315 {
316 int i, t;
317 char *p;
318 struct passwd *pw;
319 struct protent *protp;
320 char numbuf[16];
321
322 link_stats_valid = 0;
323 new_phase(PHASE_INITIALIZE);
324
325 script_env = NULL;
326
327 /* Initialize syslog facilities */
328 reopen_log();
329
330 if (gethostname(hostname, MAXNAMELEN) < 0 ) {
331 option_error("Couldn't get hostname: %m");
332 exit(1);
333 }
334 hostname[MAXNAMELEN-1] = 0;
335
336 /* make sure we don't create world or group writable files. */
337 umask(umask(0777) | 022);
338
339 uid = getuid();
340 privileged = uid == 0;
341 slprintf(numbuf, sizeof(numbuf), "%d", uid);
342 script_setenv("ORIG_UID", numbuf, 0);
343
344 ngroups = getgroups(NGROUPS_MAX, groups);
345
346 /*
347 * Initialize magic number generator now so that protocols may
348 * use magic numbers in initialization.
349 */
350 magic_init();
351
352 /*
353 * Initialize each protocol.
354 */
355 for (i = 0; (protp = protocols[i]) != NULL; ++i)
356 (*protp->init)(0);
357
358 /*
359 * Initialize the default channel.
360 */
361 tty_init();
362
363 progname = *argv;
364
365 #if defined(__ANDROID__)
366 {
367 extern void pppox_init();
368 pppox_init();
369 privileged = 1;
370 }
371 {
372 char *envargs = getenv("envargs");
373 if (envargs) {
374 int i;
375 /* Decode the arguments in-place and count the number of them.
376 * They were hex encoded using [A-P] instead of [0-9A-F]. */
377 for (argc = 0, i = 0; envargs[i] && envargs[i + 1]; i += 2) {
378 char c = ((envargs[i] - 'A') << 4) + (envargs[i + 1] - 'A');
379 if (c == 0) {
380 ++argc;
381 }
382 envargs[i / 2 + 1] = c;
383 }
384 if (argc == 0 || (argv = malloc(sizeof(char *) * argc)) == NULL) {
385 fatal("Failed to parse envargs!");
386 }
387 for (envargs[0] = 0, i = 0; i < argc; ++envargs) {
388 if (envargs[0] == 0) {
389 argv[i++] = &envargs[1];
390 }
391 }
392 }
393 }
394 #endif
395
396 /*
397 * Parse, in order, the system options file, the user's options file,
398 * and the command line arguments.
399 */
400 #if defined(__ANDROID__)
401 /* Android: only take options from commandline */
402 if (!parse_args(argc-1, argv+1))
403 exit(EXIT_OPTION_ERROR);
404
405 #else
406 if (!options_from_file(_PATH_SYSOPTIONS, !privileged, 0, 1)
407 || !options_from_user()
408 || !parse_args(argc-1, argv+1))
409 exit(EXIT_OPTION_ERROR);
410
411 #endif
412
413 devnam_fixed = 1; /* can no longer change device name */
414
415 /*
416 * Work out the device name, if it hasn't already been specified,
417 * and parse the tty's options file.
418 */
419 if (the_channel->process_extra_options)
420 (*the_channel->process_extra_options)();
421
422 if (debug)
423 setlogmask(LOG_UPTO(LOG_DEBUG));
424
425 #if !defined(__ANDROID__)
426 /*
427 * Check that we are running as root.
428 */
429 if (geteuid() != 0) {
430 option_error("must be root to run %s, since it is not setuid-root",
431 argv[0]);
432 exit(EXIT_NOT_ROOT);
433 }
434 #endif
435
436 if (!ppp_available()) {
437 option_error("%s", no_ppp_msg);
438 exit(EXIT_NO_KERNEL_SUPPORT);
439 }
440
441 /*
442 * Check that the options given are valid and consistent.
443 */
444 check_options();
445 if (!sys_check_options())
446 exit(EXIT_OPTION_ERROR);
447 auth_check_options();
448 #ifdef HAVE_MULTILINK
449 mp_check_options();
450 #endif
451 for (i = 0; (protp = protocols[i]) != NULL; ++i)
452 if (protp->check_options != NULL)
453 (*protp->check_options)();
454 if (the_channel->check_options)
455 (*the_channel->check_options)();
456
457
458 if (dump_options || dryrun) {
459 init_pr_log(NULL, LOG_INFO);
460 print_options(pr_log, NULL);
461 end_pr_log();
462 }
463
464 if (dryrun)
465 die(0);
466
467 /* Make sure fds 0, 1, 2 are open to somewhere. */
468 fd_devnull = open(_PATH_DEVNULL, O_RDWR);
469 if (fd_devnull < 0)
470 fatal("Couldn't open %s: %m", _PATH_DEVNULL);
471 while (fd_devnull <= 2) {
472 i = dup(fd_devnull);
473 if (i < 0)
474 fatal("Critical shortage of file descriptors: dup failed: %m");
475 fd_devnull = i;
476 }
477
478 /*
479 * Initialize system-dependent stuff.
480 */
481 sys_init();
482 #ifdef USE_TDB
483 pppdb = tdb_open(_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
484 if (pppdb != NULL) {
485 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
486 update_db_entry();
487 } else {
488 warn("Warning: couldn't open ppp database %s", _PATH_PPPDB);
489 if (multilink) {
490 warn("Warning: disabling multilink");
491 multilink = 0;
492 }
493 }
494 #endif
495
496 /*
497 * Detach ourselves from the terminal, if required,
498 * and identify who is running us.
499 */
500 if (!nodetach && !updetach)
501 detach();
502 p = getlogin();
503 if (p == NULL) {
504 pw = getpwuid(uid);
505 if (pw != NULL && pw->pw_name != NULL)
506 p = pw->pw_name;
507 else
508 p = "(unknown)";
509 }
510 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
511 script_setenv("PPPLOGNAME", p, 0);
512
513 if (devnam[0])
514 script_setenv("DEVICE", devnam, 1);
515 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
516 script_setenv("PPPD_PID", numbuf, 1);
517
518 setup_signals();
519
520 create_linkpidfile(getpid());
521
522 waiting = 0;
523
524 /*
525 * If we're doing dial-on-demand, set up the interface now.
526 */
527 if (demand) {
528 /*
529 * Open the loopback channel and set it up to be the ppp interface.
530 */
531 fd_loop = open_ppp_loopback();
532 set_ifunit(1);
533 /*
534 * Configure the interface and mark it up, etc.
535 */
536 demand_conf();
537 }
538
539 do_callback = 0;
540 for (;;) {
541
542 bundle_eof = 0;
543 bundle_terminating = 0;
544 listen_time = 0;
545 need_holdoff = 1;
546 devfd = -1;
547 status = EXIT_OK;
548 ++unsuccess;
549 doing_callback = do_callback;
550 do_callback = 0;
551
552 if (demand && !doing_callback) {
553 /*
554 * Don't do anything until we see some activity.
555 */
556 new_phase(PHASE_DORMANT);
557 demand_unblock();
558 add_fd(fd_loop);
559 for (;;) {
560 handle_events();
561 if (asked_to_quit)
562 break;
563 if (get_loop_output())
564 break;
565 }
566 remove_fd(fd_loop);
567 if (asked_to_quit)
568 break;
569
570 /*
571 * Now we want to bring up the link.
572 */
573 demand_block();
574 info("Starting link");
575 }
576
577 gettimeofday(&start_time, NULL);
578 script_unsetenv("CONNECT_TIME");
579 script_unsetenv("BYTES_SENT");
580 script_unsetenv("BYTES_RCVD");
581
582 lcp_open(0); /* Start protocol */
583 start_link(0);
584 while (phase != PHASE_DEAD) {
585 handle_events();
586 get_input();
587 if (kill_link)
588 lcp_close(0, "User request");
589 if (asked_to_quit) {
590 bundle_terminating = 1;
591 if (phase == PHASE_MASTER)
592 mp_bundle_terminated();
593 }
594 if (open_ccp_flag) {
595 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
596 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
597 (*ccp_protent.open)(0);
598 }
599 }
600 }
601 /* restore FSMs to original state */
602 lcp_close(0, "");
603
604 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
605 break;
606
607 if (demand)
608 demand_discard();
609 t = need_holdoff? holdoff: 0;
610 if (holdoff_hook)
611 t = (*holdoff_hook)();
612 if (t > 0) {
613 new_phase(PHASE_HOLDOFF);
614 TIMEOUT(holdoff_end, NULL, t);
615 do {
616 handle_events();
617 if (kill_link)
618 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
619 } while (phase == PHASE_HOLDOFF);
620 if (!persist)
621 break;
622 }
623 }
624
625 /* Wait for scripts to finish */
626 reap_kids();
627 if (n_children > 0) {
628 if (child_wait > 0)
629 TIMEOUT(childwait_end, NULL, child_wait);
630 if (debug) {
631 struct subprocess *chp;
632 dbglog("Waiting for %d child processes...", n_children);
633 for (chp = children; chp != NULL; chp = chp->next)
634 dbglog(" script %s, pid %d", chp->prog, chp->pid);
635 }
636 while (n_children > 0 && !childwait_done) {
637 handle_events();
638 if (kill_link && !childwait_done)
639 childwait_end(NULL);
640 }
641 }
642
643 die(status);
644 return 0;
645 }
646
647 /*
648 * handle_events - wait for something to happen and respond to it.
649 */
650 static void
handle_events()651 handle_events()
652 {
653 struct timeval timo;
654
655 kill_link = open_ccp_flag = 0;
656 if (sigsetjmp(sigjmp, 1) == 0) {
657 sigprocmask(SIG_BLOCK, &signals_handled, NULL);
658 if (got_sighup || got_sigterm || got_sigusr2 || got_sigchld) {
659 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
660 } else {
661 waiting = 1;
662 sigprocmask(SIG_UNBLOCK, &signals_handled, NULL);
663 wait_input(timeleft(&timo));
664 }
665 }
666 waiting = 0;
667 calltimeout();
668 if (got_sighup) {
669 info("Hangup (SIGHUP)");
670 kill_link = 1;
671 got_sighup = 0;
672 if (status != EXIT_HANGUP)
673 status = EXIT_USER_REQUEST;
674 }
675 if (got_sigterm) {
676 info("Terminating on signal %d", got_sigterm);
677 kill_link = 1;
678 asked_to_quit = 1;
679 persist = 0;
680 status = EXIT_USER_REQUEST;
681 got_sigterm = 0;
682 }
683 if (got_sigchld) {
684 got_sigchld = 0;
685 reap_kids(); /* Don't leave dead kids lying around */
686 }
687 if (got_sigusr2) {
688 open_ccp_flag = 1;
689 got_sigusr2 = 0;
690 }
691 }
692
693 /*
694 * setup_signals - initialize signal handling.
695 */
696 static void
setup_signals()697 setup_signals()
698 {
699 struct sigaction sa;
700
701 /*
702 * Compute mask of all interesting signals and install signal handlers
703 * for each. Only one signal handler may be active at a time. Therefore,
704 * all other signals should be masked when any handler is executing.
705 */
706 sigemptyset(&signals_handled);
707 sigaddset(&signals_handled, SIGHUP);
708 sigaddset(&signals_handled, SIGINT);
709 sigaddset(&signals_handled, SIGTERM);
710 sigaddset(&signals_handled, SIGCHLD);
711 sigaddset(&signals_handled, SIGUSR2);
712
713 #define SIGNAL(s, handler) do { \
714 sa.sa_handler = handler; \
715 if (sigaction(s, &sa, NULL) < 0) \
716 fatal("Couldn't establish signal handler (%d): %m", s); \
717 } while (0)
718
719 sa.sa_mask = signals_handled;
720 sa.sa_flags = 0;
721 SIGNAL(SIGHUP, hup); /* Hangup */
722 SIGNAL(SIGINT, term); /* Interrupt */
723 SIGNAL(SIGTERM, term); /* Terminate */
724 SIGNAL(SIGCHLD, chld);
725
726 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
727 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
728
729 /*
730 * Install a handler for other signals which would otherwise
731 * cause pppd to exit without cleaning up.
732 */
733 SIGNAL(SIGABRT, bad_signal);
734 SIGNAL(SIGALRM, bad_signal);
735 SIGNAL(SIGFPE, bad_signal);
736 SIGNAL(SIGILL, bad_signal);
737 SIGNAL(SIGPIPE, bad_signal);
738 SIGNAL(SIGQUIT, bad_signal);
739 SIGNAL(SIGSEGV, bad_signal);
740 #ifdef SIGBUS
741 SIGNAL(SIGBUS, bad_signal);
742 #endif
743 #ifdef SIGEMT
744 SIGNAL(SIGEMT, bad_signal);
745 #endif
746 #ifdef SIGPOLL
747 SIGNAL(SIGPOLL, bad_signal);
748 #endif
749 #ifdef SIGPROF
750 SIGNAL(SIGPROF, bad_signal);
751 #endif
752 #ifdef SIGSYS
753 SIGNAL(SIGSYS, bad_signal);
754 #endif
755 #ifdef SIGTRAP
756 SIGNAL(SIGTRAP, bad_signal);
757 #endif
758 #ifdef SIGVTALRM
759 SIGNAL(SIGVTALRM, bad_signal);
760 #endif
761 #ifdef SIGXCPU
762 SIGNAL(SIGXCPU, bad_signal);
763 #endif
764 #ifdef SIGXFSZ
765 SIGNAL(SIGXFSZ, bad_signal);
766 #endif
767
768 /*
769 * Apparently we can get a SIGPIPE when we call syslog, if
770 * syslogd has died and been restarted. Ignoring it seems
771 * be sufficient.
772 */
773 signal(SIGPIPE, SIG_IGN);
774 }
775
776 /*
777 * set_ifunit - do things we need to do once we know which ppp
778 * unit we are using.
779 */
780 void
set_ifunit(iskey)781 set_ifunit(iskey)
782 int iskey;
783 {
784 info("Using interface %s%d", PPP_DRV_NAME, ifunit);
785 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
786 script_setenv("IFNAME", ifname, iskey);
787 if (iskey) {
788 create_pidfile(getpid()); /* write pid to file */
789 create_linkpidfile(getpid());
790 }
791 }
792
793 /*
794 * detach - detach us from the controlling terminal.
795 */
796 void
detach()797 detach()
798 {
799 int pid;
800 char numbuf[16];
801 int pipefd[2];
802
803 if (detached)
804 return;
805 if (pipe(pipefd) == -1)
806 pipefd[0] = pipefd[1] = -1;
807 if ((pid = fork()) < 0) {
808 error("Couldn't detach (fork failed: %m)");
809 die(1); /* or just return? */
810 }
811 if (pid != 0) {
812 /* parent */
813 notify(pidchange, pid);
814 /* update pid files if they have been written already */
815 if (pidfilename[0])
816 create_pidfile(pid);
817 if (linkpidfile[0])
818 create_linkpidfile(pid);
819 exit(0); /* parent dies */
820 }
821 setsid();
822 chdir("/");
823 dup2(fd_devnull, 0);
824 dup2(fd_devnull, 1);
825 dup2(fd_devnull, 2);
826 detached = 1;
827 if (log_default)
828 log_to_fd = -1;
829 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
830 script_setenv("PPPD_PID", numbuf, 1);
831
832 /* wait for parent to finish updating pid & lock files and die */
833 close(pipefd[1]);
834 complete_read(pipefd[0], numbuf, 1);
835 close(pipefd[0]);
836 }
837
838 /*
839 * reopen_log - (re)open our connection to syslog.
840 */
841 void
reopen_log()842 reopen_log()
843 {
844 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
845 setlogmask(LOG_UPTO(LOG_INFO));
846 }
847
848 /*
849 * Create a file containing our process ID.
850 */
851 static void
create_pidfile(pid)852 create_pidfile(pid)
853 int pid;
854 {
855 #if !defined(__ANDROID__)
856 FILE *pidfile;
857
858 slprintf(pidfilename, sizeof(pidfilename), "%s%s.pid",
859 _PATH_VARRUN, ifname);
860 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
861 fprintf(pidfile, "%d\n", pid);
862 (void) fclose(pidfile);
863 } else {
864 error("Failed to create pid file %s: %m", pidfilename);
865 pidfilename[0] = 0;
866 }
867 #endif
868 }
869
870 void
create_linkpidfile(pid)871 create_linkpidfile(pid)
872 int pid;
873 {
874 #if !defined(__ANDROID__)
875 FILE *pidfile;
876
877 if (linkname[0] == 0)
878 return;
879 script_setenv("LINKNAME", linkname, 1);
880 slprintf(linkpidfile, sizeof(linkpidfile), "%sppp-%s.pid",
881 _PATH_VARRUN, linkname);
882 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
883 fprintf(pidfile, "%d\n", pid);
884 if (ifname[0])
885 fprintf(pidfile, "%s\n", ifname);
886 (void) fclose(pidfile);
887 } else {
888 error("Failed to create pid file %s: %m", linkpidfile);
889 linkpidfile[0] = 0;
890 }
891 #endif
892 }
893
894 /*
895 * remove_pidfile - remove our pid files
896 */
remove_pidfiles()897 void remove_pidfiles()
898 {
899 #if !defined(__ANDROID__)
900 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
901 warn("unable to delete pid file %s: %m", pidfilename);
902 pidfilename[0] = 0;
903 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
904 warn("unable to delete pid file %s: %m", linkpidfile);
905 linkpidfile[0] = 0;
906 #endif
907 }
908
909 /*
910 * holdoff_end - called via a timeout when the holdoff period ends.
911 */
912 static void
holdoff_end(arg)913 holdoff_end(arg)
914 void *arg;
915 {
916 new_phase(PHASE_DORMANT);
917 }
918
919 /* List of protocol names, to make our messages a little more informative. */
920 struct protocol_list {
921 u_short proto;
922 const char *name;
923 } protocol_list[] = {
924 { 0x21, "IP" },
925 { 0x23, "OSI Network Layer" },
926 { 0x25, "Xerox NS IDP" },
927 { 0x27, "DECnet Phase IV" },
928 { 0x29, "Appletalk" },
929 { 0x2b, "Novell IPX" },
930 { 0x2d, "VJ compressed TCP/IP" },
931 { 0x2f, "VJ uncompressed TCP/IP" },
932 { 0x31, "Bridging PDU" },
933 { 0x33, "Stream Protocol ST-II" },
934 { 0x35, "Banyan Vines" },
935 { 0x39, "AppleTalk EDDP" },
936 { 0x3b, "AppleTalk SmartBuffered" },
937 { 0x3d, "Multi-Link" },
938 { 0x3f, "NETBIOS Framing" },
939 { 0x41, "Cisco Systems" },
940 { 0x43, "Ascom Timeplex" },
941 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
942 { 0x47, "DCA Remote Lan" },
943 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
944 { 0x4b, "SNA over 802.2" },
945 { 0x4d, "SNA" },
946 { 0x4f, "IP6 Header Compression" },
947 { 0x51, "KNX Bridging Data" },
948 { 0x53, "Encryption" },
949 { 0x55, "Individual Link Encryption" },
950 { 0x57, "IPv6" },
951 { 0x59, "PPP Muxing" },
952 { 0x5b, "Vendor-Specific Network Protocol" },
953 { 0x61, "RTP IPHC Full Header" },
954 { 0x63, "RTP IPHC Compressed TCP" },
955 { 0x65, "RTP IPHC Compressed non-TCP" },
956 { 0x67, "RTP IPHC Compressed UDP 8" },
957 { 0x69, "RTP IPHC Compressed RTP 8" },
958 { 0x6f, "Stampede Bridging" },
959 { 0x73, "MP+" },
960 { 0xc1, "NTCITS IPI" },
961 { 0xfb, "single-link compression" },
962 { 0xfd, "Compressed Datagram" },
963 { 0x0201, "802.1d Hello Packets" },
964 { 0x0203, "IBM Source Routing BPDU" },
965 { 0x0205, "DEC LANBridge100 Spanning Tree" },
966 { 0x0207, "Cisco Discovery Protocol" },
967 { 0x0209, "Netcs Twin Routing" },
968 { 0x020b, "STP - Scheduled Transfer Protocol" },
969 { 0x020d, "EDP - Extreme Discovery Protocol" },
970 { 0x0211, "Optical Supervisory Channel Protocol" },
971 { 0x0213, "Optical Supervisory Channel Protocol" },
972 { 0x0231, "Luxcom" },
973 { 0x0233, "Sigma Network Systems" },
974 { 0x0235, "Apple Client Server Protocol" },
975 { 0x0281, "MPLS Unicast" },
976 { 0x0283, "MPLS Multicast" },
977 { 0x0285, "IEEE p1284.4 standard - data packets" },
978 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
979 { 0x0289, "Multichannel Flow Treatment Protocol" },
980 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
981 { 0x2065, "RTP IPHC Context State" },
982 { 0x2067, "RTP IPHC Compressed UDP 16" },
983 { 0x2069, "RTP IPHC Compressed RTP 16" },
984 { 0x4001, "Cray Communications Control Protocol" },
985 { 0x4003, "CDPD Mobile Network Registration Protocol" },
986 { 0x4005, "Expand accelerator protocol" },
987 { 0x4007, "ODSICP NCP" },
988 { 0x4009, "DOCSIS DLL" },
989 { 0x400B, "Cetacean Network Detection Protocol" },
990 { 0x4021, "Stacker LZS" },
991 { 0x4023, "RefTek Protocol" },
992 { 0x4025, "Fibre Channel" },
993 { 0x4027, "EMIT Protocols" },
994 { 0x405b, "Vendor-Specific Protocol (VSP)" },
995 { 0x8021, "Internet Protocol Control Protocol" },
996 { 0x8023, "OSI Network Layer Control Protocol" },
997 { 0x8025, "Xerox NS IDP Control Protocol" },
998 { 0x8027, "DECnet Phase IV Control Protocol" },
999 { 0x8029, "Appletalk Control Protocol" },
1000 { 0x802b, "Novell IPX Control Protocol" },
1001 { 0x8031, "Bridging NCP" },
1002 { 0x8033, "Stream Protocol Control Protocol" },
1003 { 0x8035, "Banyan Vines Control Protocol" },
1004 { 0x803d, "Multi-Link Control Protocol" },
1005 { 0x803f, "NETBIOS Framing Control Protocol" },
1006 { 0x8041, "Cisco Systems Control Protocol" },
1007 { 0x8043, "Ascom Timeplex" },
1008 { 0x8045, "Fujitsu LBLB Control Protocol" },
1009 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1010 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1011 { 0x804b, "SNA over 802.2 Control Protocol" },
1012 { 0x804d, "SNA Control Protocol" },
1013 { 0x804f, "IP6 Header Compression Control Protocol" },
1014 { 0x8051, "KNX Bridging Control Protocol" },
1015 { 0x8053, "Encryption Control Protocol" },
1016 { 0x8055, "Individual Link Encryption Control Protocol" },
1017 { 0x8057, "IPv6 Control Protocol" },
1018 { 0x8059, "PPP Muxing Control Protocol" },
1019 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
1020 { 0x806f, "Stampede Bridging Control Protocol" },
1021 { 0x8073, "MP+ Control Protocol" },
1022 { 0x80c1, "NTCITS IPI Control Protocol" },
1023 { 0x80fb, "Single Link Compression Control Protocol" },
1024 { 0x80fd, "Compression Control Protocol" },
1025 { 0x8207, "Cisco Discovery Protocol Control" },
1026 { 0x8209, "Netcs Twin Routing" },
1027 { 0x820b, "STP - Control Protocol" },
1028 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
1029 { 0x8235, "Apple Client Server Protocol Control" },
1030 { 0x8281, "MPLSCP" },
1031 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
1032 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1033 { 0x8289, "Multichannel Flow Treatment Protocol" },
1034 { 0xc021, "Link Control Protocol" },
1035 { 0xc023, "Password Authentication Protocol" },
1036 { 0xc025, "Link Quality Report" },
1037 { 0xc027, "Shiva Password Authentication Protocol" },
1038 { 0xc029, "CallBack Control Protocol (CBCP)" },
1039 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
1040 { 0xc02d, "BAP" },
1041 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
1042 { 0xc081, "Container Control Protocol" },
1043 { 0xc223, "Challenge Handshake Authentication Protocol" },
1044 { 0xc225, "RSA Authentication Protocol" },
1045 { 0xc227, "Extensible Authentication Protocol" },
1046 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1047 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1048 { 0xc281, "Proprietary Authentication Protocol" },
1049 { 0xc283, "Proprietary Authentication Protocol" },
1050 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1051 { 0, NULL },
1052 };
1053
1054 /*
1055 * protocol_name - find a name for a PPP protocol.
1056 */
1057 const char *
protocol_name(proto)1058 protocol_name(proto)
1059 int proto;
1060 {
1061 struct protocol_list *lp;
1062
1063 for (lp = protocol_list; lp->proto != 0; ++lp)
1064 if (proto == lp->proto)
1065 return lp->name;
1066 return NULL;
1067 }
1068
1069 /*
1070 * get_input - called when incoming data is available.
1071 */
1072 static void
get_input()1073 get_input()
1074 {
1075 int len, i;
1076 u_char *p;
1077 u_short protocol;
1078 struct protent *protp;
1079
1080 p = inpacket_buf; /* point to beginning of packet buffer */
1081
1082 len = read_packet(inpacket_buf);
1083 if (len < 0)
1084 return;
1085
1086 if (len == 0) {
1087 if (bundle_eof && multilink_master) {
1088 notice("Last channel has disconnected");
1089 mp_bundle_terminated();
1090 return;
1091 }
1092 notice("Modem hangup");
1093 hungup = 1;
1094 status = EXIT_HANGUP;
1095 lcp_lowerdown(0); /* serial link is no longer available */
1096 link_terminated(0);
1097 return;
1098 }
1099
1100 if (len < PPP_HDRLEN) {
1101 dbglog("received short packet:%.*B", len, p);
1102 return;
1103 }
1104
1105 dump_packet("rcvd", p, len);
1106 if (snoop_recv_hook) snoop_recv_hook(p, len);
1107
1108 p += 2; /* Skip address and control */
1109 GETSHORT(protocol, p);
1110 len -= PPP_HDRLEN;
1111
1112 /*
1113 * Toss all non-LCP packets unless LCP is OPEN.
1114 */
1115 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1116 dbglog("Discarded non-LCP packet when LCP not open");
1117 return;
1118 }
1119
1120 /*
1121 * Until we get past the authentication phase, toss all packets
1122 * except LCP, LQR and authentication packets.
1123 */
1124 if (phase <= PHASE_AUTHENTICATE
1125 && !(protocol == PPP_LCP || protocol == PPP_LQR
1126 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1127 protocol == PPP_EAP)) {
1128 dbglog("discarding proto 0x%x in phase %d",
1129 protocol, phase);
1130 return;
1131 }
1132
1133 /*
1134 * Upcall the proper protocol input routine.
1135 */
1136 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1137 if (protp->protocol == protocol && protp->enabled_flag) {
1138 (*protp->input)(0, p, len);
1139 return;
1140 }
1141 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1142 && protp->datainput != NULL) {
1143 (*protp->datainput)(0, p, len);
1144 return;
1145 }
1146 }
1147
1148 if (debug) {
1149 const char *pname = protocol_name(protocol);
1150 if (pname != NULL)
1151 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1152 else
1153 warn("Unsupported protocol 0x%x received", protocol);
1154 }
1155 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1156 }
1157
1158 /*
1159 * ppp_send_config - configure the transmit-side characteristics of
1160 * the ppp interface. Returns -1, indicating an error, if the channel
1161 * send_config procedure called error() (or incremented error_count
1162 * itself), otherwise 0.
1163 */
1164 int
ppp_send_config(unit,mtu,accm,pcomp,accomp)1165 ppp_send_config(unit, mtu, accm, pcomp, accomp)
1166 int unit, mtu;
1167 u_int32_t accm;
1168 int pcomp, accomp;
1169 {
1170 int errs;
1171
1172 if (the_channel->send_config == NULL)
1173 return 0;
1174 errs = error_count;
1175 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1176 return (error_count != errs)? -1: 0;
1177 }
1178
1179 /*
1180 * ppp_recv_config - configure the receive-side characteristics of
1181 * the ppp interface. Returns -1, indicating an error, if the channel
1182 * recv_config procedure called error() (or incremented error_count
1183 * itself), otherwise 0.
1184 */
1185 int
ppp_recv_config(unit,mru,accm,pcomp,accomp)1186 ppp_recv_config(unit, mru, accm, pcomp, accomp)
1187 int unit, mru;
1188 u_int32_t accm;
1189 int pcomp, accomp;
1190 {
1191 int errs;
1192
1193 if (the_channel->recv_config == NULL)
1194 return 0;
1195 errs = error_count;
1196 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1197 return (error_count != errs)? -1: 0;
1198 }
1199
1200 /*
1201 * new_phase - signal the start of a new phase of pppd's operation.
1202 */
1203 void
new_phase(p)1204 new_phase(p)
1205 int p;
1206 {
1207 phase = p;
1208 if (new_phase_hook)
1209 (*new_phase_hook)(p);
1210 notify(phasechange, p);
1211 }
1212
1213 /*
1214 * die - clean up state and exit with the specified status.
1215 */
1216 void
die(status)1217 die(status)
1218 int status;
1219 {
1220 if (!doing_multilink || multilink_master)
1221 print_link_stats();
1222 cleanup();
1223 notify(exitnotify, status);
1224 syslog(LOG_INFO, "Exit.");
1225 exit(status);
1226 }
1227
1228 /*
1229 * cleanup - restore anything which needs to be restored before we exit
1230 */
1231 /* ARGSUSED */
1232 static void
cleanup()1233 cleanup()
1234 {
1235 sys_cleanup();
1236
1237 if (fd_ppp >= 0)
1238 the_channel->disestablish_ppp(devfd);
1239 if (the_channel->cleanup)
1240 (*the_channel->cleanup)();
1241 remove_pidfiles();
1242
1243 #ifdef USE_TDB
1244 if (pppdb != NULL)
1245 cleanup_db();
1246 #endif
1247
1248 }
1249
1250 void
print_link_stats()1251 print_link_stats()
1252 {
1253 /*
1254 * Print connect time and statistics.
1255 */
1256 if (link_stats_valid) {
1257 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1258 info("Connect time %d.%d minutes.", t/10, t%10);
1259 info("Sent %u bytes, received %u bytes.",
1260 link_stats.bytes_out, link_stats.bytes_in);
1261 link_stats_valid = 0;
1262 }
1263 }
1264
1265 /*
1266 * reset_link_stats - "reset" stats when link goes up.
1267 */
1268 void
reset_link_stats(u)1269 reset_link_stats(u)
1270 int u;
1271 {
1272 if (!get_ppp_stats(u, &old_link_stats))
1273 return;
1274 gettimeofday(&start_time, NULL);
1275 }
1276
1277 /*
1278 * update_link_stats - get stats at link termination.
1279 */
1280 void
update_link_stats(u)1281 update_link_stats(u)
1282 int u;
1283 {
1284 struct timeval now;
1285 char numbuf[32];
1286
1287 if (!get_ppp_stats(u, &link_stats)
1288 || gettimeofday(&now, NULL) < 0)
1289 return;
1290 link_connect_time = now.tv_sec - start_time.tv_sec;
1291 link_stats_valid = 1;
1292
1293 link_stats.bytes_in -= old_link_stats.bytes_in;
1294 link_stats.bytes_out -= old_link_stats.bytes_out;
1295 link_stats.pkts_in -= old_link_stats.pkts_in;
1296 link_stats.pkts_out -= old_link_stats.pkts_out;
1297
1298 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1299 script_setenv("CONNECT_TIME", numbuf, 0);
1300 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_out);
1301 script_setenv("BYTES_SENT", numbuf, 0);
1302 slprintf(numbuf, sizeof(numbuf), "%u", link_stats.bytes_in);
1303 script_setenv("BYTES_RCVD", numbuf, 0);
1304 }
1305
1306
1307 struct callout {
1308 struct timeval c_time; /* time at which to call routine */
1309 void *c_arg; /* argument to routine */
1310 void (*c_func) __P((void *)); /* routine */
1311 struct callout *c_next;
1312 };
1313
1314 static struct callout *callout = NULL; /* Callout list */
1315 static struct timeval timenow; /* Current time */
1316
1317 /*
1318 * timeout - Schedule a timeout.
1319 */
1320 void
1321 timeout(func, arg, secs, usecs)
1322 void (*func) __P((void *));
1323 void *arg;
1324 int secs, usecs;
1325 {
1326 struct callout *newp, *p, **pp;
1327
1328 /*
1329 * Allocate timeout.
1330 */
1331 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1332 fatal("Out of memory in timeout()!");
1333 newp->c_arg = arg;
1334 newp->c_func = func;
1335 gettimeofday(&timenow, NULL);
1336 newp->c_time.tv_sec = timenow.tv_sec + secs;
1337 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1338 if (newp->c_time.tv_usec >= 1000000) {
1339 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1340 newp->c_time.tv_usec %= 1000000;
1341 }
1342
1343 /*
1344 * Find correct place and link it in.
1345 */
1346 for (pp = &callout; (p = *pp); pp = &p->c_next)
1347 if (newp->c_time.tv_sec < p->c_time.tv_sec
1348 || (newp->c_time.tv_sec == p->c_time.tv_sec
1349 && newp->c_time.tv_usec < p->c_time.tv_usec))
1350 break;
1351 newp->c_next = p;
1352 *pp = newp;
1353 }
1354
1355
1356 /*
1357 * untimeout - Unschedule a timeout.
1358 */
1359 void
1360 untimeout(func, arg)
1361 void (*func) __P((void *));
1362 void *arg;
1363 {
1364 struct callout **copp, *freep;
1365
1366 /*
1367 * Find first matching timeout and remove it from the list.
1368 */
1369 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1370 if (freep->c_func == func && freep->c_arg == arg) {
1371 *copp = freep->c_next;
1372 free((char *) freep);
1373 break;
1374 }
1375 }
1376
1377
1378 /*
1379 * calltimeout - Call any timeout routines which are now due.
1380 */
1381 static void
calltimeout()1382 calltimeout()
1383 {
1384 struct callout *p;
1385
1386 while (callout != NULL) {
1387 p = callout;
1388
1389 if (gettimeofday(&timenow, NULL) < 0)
1390 fatal("Failed to get time of day: %m");
1391 if (!(p->c_time.tv_sec < timenow.tv_sec
1392 || (p->c_time.tv_sec == timenow.tv_sec
1393 && p->c_time.tv_usec <= timenow.tv_usec)))
1394 break; /* no, it's not time yet */
1395
1396 callout = p->c_next;
1397 (*p->c_func)(p->c_arg);
1398
1399 free((char *) p);
1400 }
1401 }
1402
1403
1404 /*
1405 * timeleft - return the length of time until the next timeout is due.
1406 */
1407 static struct timeval *
timeleft(tvp)1408 timeleft(tvp)
1409 struct timeval *tvp;
1410 {
1411 if (callout == NULL)
1412 return NULL;
1413
1414 gettimeofday(&timenow, NULL);
1415 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1416 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1417 if (tvp->tv_usec < 0) {
1418 tvp->tv_usec += 1000000;
1419 tvp->tv_sec -= 1;
1420 }
1421 if (tvp->tv_sec < 0)
1422 tvp->tv_sec = tvp->tv_usec = 0;
1423
1424 return tvp;
1425 }
1426
1427
1428 /*
1429 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1430 * We assume that sig is currently blocked.
1431 */
1432 static void
kill_my_pg(sig)1433 kill_my_pg(sig)
1434 int sig;
1435 {
1436 struct sigaction act, oldact;
1437 struct subprocess *chp;
1438
1439 if (!detached) {
1440 /*
1441 * There might be other things in our process group that we
1442 * didn't start that would get hit if we did a kill(0), so
1443 * just send the signal individually to our children.
1444 */
1445 for (chp = children; chp != NULL; chp = chp->next)
1446 if (chp->killable)
1447 kill(chp->pid, sig);
1448 return;
1449 }
1450
1451 /* We've done a setsid(), so we can just use a kill(0) */
1452 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1453 act.sa_handler = SIG_IGN;
1454 act.sa_flags = 0;
1455 kill(0, sig);
1456 /*
1457 * The kill() above made the signal pending for us, as well as
1458 * the rest of our process group, but we don't want it delivered
1459 * to us. It is blocked at the moment. Setting it to be ignored
1460 * will cause the pending signal to be discarded. If we did the
1461 * kill() after setting the signal to be ignored, it is unspecified
1462 * (by POSIX) whether the signal is immediately discarded or left
1463 * pending, and in fact Linux would leave it pending, and so it
1464 * would be delivered after the current signal handler exits,
1465 * leading to an infinite loop.
1466 */
1467 sigaction(sig, &act, &oldact);
1468 sigaction(sig, &oldact, NULL);
1469 }
1470
1471
1472 /*
1473 * hup - Catch SIGHUP signal.
1474 *
1475 * Indicates that the physical layer has been disconnected.
1476 * We don't rely on this indication; if the user has sent this
1477 * signal, we just take the link down.
1478 */
1479 static void
hup(sig)1480 hup(sig)
1481 int sig;
1482 {
1483 /* can't log a message here, it can deadlock */
1484 got_sighup = 1;
1485 if (conn_running)
1486 /* Send the signal to the [dis]connector process(es) also */
1487 kill_my_pg(sig);
1488 notify(sigreceived, sig);
1489 if (waiting)
1490 siglongjmp(sigjmp, 1);
1491 }
1492
1493
1494 /*
1495 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1496 *
1497 * Indicates that we should initiate a graceful disconnect and exit.
1498 */
1499 /*ARGSUSED*/
1500 static void
term(sig)1501 term(sig)
1502 int sig;
1503 {
1504 /* can't log a message here, it can deadlock */
1505 got_sigterm = sig;
1506 if (conn_running)
1507 /* Send the signal to the [dis]connector process(es) also */
1508 kill_my_pg(sig);
1509 notify(sigreceived, sig);
1510 if (waiting)
1511 siglongjmp(sigjmp, 1);
1512 }
1513
1514
1515 /*
1516 * chld - Catch SIGCHLD signal.
1517 * Sets a flag so we will call reap_kids in the mainline.
1518 */
1519 static void
chld(sig)1520 chld(sig)
1521 int sig;
1522 {
1523 got_sigchld = 1;
1524 if (waiting)
1525 siglongjmp(sigjmp, 1);
1526 }
1527
1528
1529 /*
1530 * toggle_debug - Catch SIGUSR1 signal.
1531 *
1532 * Toggle debug flag.
1533 */
1534 /*ARGSUSED*/
1535 static void
toggle_debug(sig)1536 toggle_debug(sig)
1537 int sig;
1538 {
1539 debug = !debug;
1540 if (debug) {
1541 setlogmask(LOG_UPTO(LOG_DEBUG));
1542 } else {
1543 setlogmask(LOG_UPTO(LOG_WARNING));
1544 }
1545 }
1546
1547
1548 /*
1549 * open_ccp - Catch SIGUSR2 signal.
1550 *
1551 * Try to (re)negotiate compression.
1552 */
1553 /*ARGSUSED*/
1554 static void
open_ccp(sig)1555 open_ccp(sig)
1556 int sig;
1557 {
1558 got_sigusr2 = 1;
1559 if (waiting)
1560 siglongjmp(sigjmp, 1);
1561 }
1562
1563
1564 /*
1565 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1566 */
1567 static void
bad_signal(sig)1568 bad_signal(sig)
1569 int sig;
1570 {
1571 static int crashed = 0;
1572
1573 if (crashed)
1574 _exit(127);
1575 crashed = 1;
1576 error("Fatal signal %d", sig);
1577 if (conn_running)
1578 kill_my_pg(SIGTERM);
1579 notify(sigreceived, sig);
1580 die(127);
1581 }
1582
1583 /*
1584 * safe_fork - Create a child process. The child closes all the
1585 * file descriptors that we don't want to leak to a script.
1586 * The parent waits for the child to do this before returning.
1587 * This also arranges for the specified fds to be dup'd to
1588 * fds 0, 1, 2 in the child.
1589 */
1590 pid_t
safe_fork(int infd,int outfd,int errfd)1591 safe_fork(int infd, int outfd, int errfd)
1592 {
1593 pid_t pid;
1594 int fd, pipefd[2];
1595 char buf[1];
1596
1597 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1598 while ((fd = dup(fd_devnull)) >= 0) {
1599 if (fd > 2) {
1600 close(fd);
1601 break;
1602 }
1603 }
1604
1605 if (pipe(pipefd) == -1)
1606 pipefd[0] = pipefd[1] = -1;
1607 pid = fork();
1608 if (pid < 0) {
1609 error("fork failed: %m");
1610 return -1;
1611 }
1612 if (pid > 0) {
1613 /* parent */
1614 close(pipefd[1]);
1615 /* this read() blocks until the close(pipefd[1]) below */
1616 complete_read(pipefd[0], buf, 1);
1617 close(pipefd[0]);
1618 return pid;
1619 }
1620
1621 /* Executing in the child */
1622 sys_close();
1623 #ifdef USE_TDB
1624 tdb_close(pppdb);
1625 #endif
1626
1627 /* make sure infd, outfd and errfd won't get tromped on below */
1628 if (infd == 1 || infd == 2)
1629 infd = dup(infd);
1630 if (outfd == 0 || outfd == 2)
1631 outfd = dup(outfd);
1632 if (errfd == 0 || errfd == 1)
1633 errfd = dup(errfd);
1634
1635 closelog();
1636
1637 /* dup the in, out, err fds to 0, 1, 2 */
1638 if (infd != 0)
1639 dup2(infd, 0);
1640 if (outfd != 1)
1641 dup2(outfd, 1);
1642 if (errfd != 2)
1643 dup2(errfd, 2);
1644
1645 if (log_to_fd > 2)
1646 close(log_to_fd);
1647 if (the_channel->close)
1648 (*the_channel->close)();
1649 else
1650 close(devfd); /* some plugins don't have a close function */
1651 close(fd_ppp);
1652 close(fd_devnull);
1653 if (infd != 0)
1654 close(infd);
1655 if (outfd != 1)
1656 close(outfd);
1657 if (errfd != 2)
1658 close(errfd);
1659
1660 notify(fork_notifier, 0);
1661 close(pipefd[0]);
1662 /* this close unblocks the read() call above in the parent */
1663 close(pipefd[1]);
1664
1665 return 0;
1666 }
1667
1668 static bool
add_script_env(pos,newstring)1669 add_script_env(pos, newstring)
1670 int pos;
1671 char *newstring;
1672 {
1673 if (pos + 1 >= s_env_nalloc) {
1674 int new_n = pos + 17;
1675 char **newenv = realloc(script_env, new_n * sizeof(char *));
1676 if (newenv == NULL) {
1677 free(newstring - 1);
1678 return 0;
1679 }
1680 script_env = newenv;
1681 s_env_nalloc = new_n;
1682 }
1683 script_env[pos] = newstring;
1684 script_env[pos + 1] = NULL;
1685 return 1;
1686 }
1687
1688 static void
remove_script_env(pos)1689 remove_script_env(pos)
1690 int pos;
1691 {
1692 free(script_env[pos] - 1);
1693 while ((script_env[pos] = script_env[pos + 1]) != NULL)
1694 pos++;
1695 }
1696
1697 /*
1698 * update_system_environment - process the list of set/unset options
1699 * and update the system environment.
1700 */
1701 static void
update_system_environment()1702 update_system_environment()
1703 {
1704 struct userenv *uep;
1705
1706 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1707 if (uep->ue_isset)
1708 setenv(uep->ue_name, uep->ue_value, 1);
1709 else
1710 unsetenv(uep->ue_name);
1711 }
1712 }
1713
1714 /*
1715 * device_script - run a program to talk to the specified fds
1716 * (e.g. to run the connector or disconnector script).
1717 * stderr gets connected to the log fd or to the _PATH_CONNERRS file.
1718 */
1719 int
device_script(program,in,out,dont_wait)1720 device_script(program, in, out, dont_wait)
1721 char *program;
1722 int in, out;
1723 int dont_wait;
1724 {
1725 int pid;
1726 int status = -1;
1727 int errfd;
1728
1729 if (log_to_fd >= 0)
1730 errfd = log_to_fd;
1731 else
1732 errfd = open(_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1733
1734 ++conn_running;
1735 pid = safe_fork(in, out, errfd);
1736
1737 if (pid != 0 && log_to_fd < 0)
1738 close(errfd);
1739
1740 if (pid < 0) {
1741 --conn_running;
1742 error("Failed to create child process: %m");
1743 return -1;
1744 }
1745
1746 if (pid != 0) {
1747 record_child(pid, program, NULL, NULL, 1);
1748 status = 0;
1749 if (!dont_wait) {
1750 while (waitpid(pid, &status, 0) < 0) {
1751 if (errno == EINTR)
1752 continue;
1753 fatal("error waiting for (dis)connection process: %m");
1754 }
1755 forget_child(pid, status);
1756 --conn_running;
1757 }
1758 return (status == 0 ? 0 : -1);
1759 }
1760
1761 /* here we are executing in the child */
1762
1763 setgid(getgid());
1764 setuid(uid);
1765 if (getuid() != uid) {
1766 fprintf(stderr, "pppd: setuid failed\n");
1767 exit(1);
1768 }
1769 update_system_environment();
1770 #if defined(__ANDROID__)
1771 execl("/system/bin/sh", "sh", "-c", program, NULL);
1772 #else
1773 execl("/bin/sh", "sh", "-c", program, (char *)0);
1774 #endif
1775 perror("pppd: could not exec /bin/sh");
1776 _exit(99);
1777 /* NOTREACHED */
1778 }
1779
1780
1781 /*
1782 * update_script_environment - process the list of set/unset options
1783 * and update the script environment. Note that we intentionally do
1784 * not update the TDB. These changes are layered on top right before
1785 * exec. It is not possible to use script_setenv() or
1786 * script_unsetenv() safely after this routine is run.
1787 */
1788 static void
update_script_environment()1789 update_script_environment()
1790 {
1791 struct userenv *uep;
1792
1793 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1794 int i;
1795 char *p, *newstring;
1796 int nlen = strlen(uep->ue_name);
1797
1798 for (i = 0; (p = script_env[i]) != NULL; i++) {
1799 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=')
1800 break;
1801 }
1802 if (uep->ue_isset) {
1803 nlen += strlen(uep->ue_value) + 2;
1804 newstring = malloc(nlen + 1);
1805 if (newstring == NULL)
1806 continue;
1807 *newstring++ = 0;
1808 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value);
1809 if (p != NULL)
1810 script_env[i] = newstring;
1811 else
1812 add_script_env(i, newstring);
1813 } else {
1814 remove_script_env(i);
1815 }
1816 }
1817 }
1818
1819 /*
1820 * run_program - execute a program with given arguments,
1821 * but don't wait for it unless wait is non-zero.
1822 * If the program can't be executed, logs an error unless
1823 * must_exist is 0 and the program file doesn't exist.
1824 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1825 * or isn't an executable plain file, or the process ID of the child.
1826 * If done != NULL, (*done)(arg) will be called later (within
1827 * reap_kids) iff the return value is > 0.
1828 */
1829 pid_t
run_program(prog,args,must_exist,done,arg,wait)1830 run_program(prog, args, must_exist, done, arg, wait)
1831 char *prog;
1832 char **args;
1833 int must_exist;
1834 void (*done) __P((void *));
1835 void *arg;
1836 int wait;
1837 {
1838 int pid, status;
1839 struct stat sbuf;
1840
1841 #if defined(__ANDROID__)
1842 /* Originally linkname is used to create named pid files, which is
1843 * meaningless to android. Here we use it as a suffix of program names,
1844 * so different users can run their own program by specifying it. For
1845 * example, "/etc/ppp/ip-up-vpn" will be executed when IPCP is up and
1846 * linkname is "vpn". Note that "/" is not allowed for security reasons. */
1847 char file[MAXPATHLEN];
1848
1849 if (linkname[0] && !strchr(linkname, '/')) {
1850 snprintf(file, MAXPATHLEN, "%s-%s", prog, linkname);
1851 file[MAXPATHLEN - 1] = '\0';
1852 prog = file;
1853 }
1854 #endif
1855
1856 /*
1857 * First check if the file exists and is executable.
1858 * We don't use access() because that would use the
1859 * real user-id, which might not be root, and the script
1860 * might be accessible only to root.
1861 */
1862 errno = EINVAL;
1863 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1864 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1865 if (must_exist || errno != ENOENT)
1866 warn("Can't execute %s: %m", prog);
1867 return 0;
1868 }
1869
1870 pid = safe_fork(fd_devnull, fd_devnull, fd_devnull);
1871 if (pid == -1) {
1872 error("Failed to create child process for %s: %m", prog);
1873 return -1;
1874 }
1875 if (pid != 0) {
1876 if (debug)
1877 dbglog("Script %s started (pid %d)", prog, pid);
1878 record_child(pid, prog, done, arg, 0);
1879 if (wait) {
1880 while (waitpid(pid, &status, 0) < 0) {
1881 if (errno == EINTR)
1882 continue;
1883 fatal("error waiting for script %s: %m", prog);
1884 }
1885 forget_child(pid, status);
1886 }
1887 return pid;
1888 }
1889
1890 /* Leave the current location */
1891 (void) setsid(); /* No controlling tty. */
1892 (void) umask (S_IRWXG|S_IRWXO);
1893 (void) chdir ("/"); /* no current directory. */
1894 setuid(0); /* set real UID = root */
1895 setgid(getegid());
1896
1897 #ifdef BSD
1898 /* Force the priority back to zero if pppd is running higher. */
1899 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1900 warn("can't reset priority to 0: %m");
1901 #endif
1902
1903 /* run the program */
1904 update_script_environment();
1905 execve(prog, args, script_env);
1906 if (must_exist || errno != ENOENT) {
1907 /* have to reopen the log, there's nowhere else
1908 for the message to go. */
1909 reopen_log();
1910 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1911 closelog();
1912 }
1913 _exit(99);
1914 }
1915
1916
1917 /*
1918 * record_child - add a child process to the list for reap_kids
1919 * to use.
1920 */
1921 void
record_child(pid,prog,done,arg,killable)1922 record_child(pid, prog, done, arg, killable)
1923 int pid;
1924 char *prog;
1925 void (*done) __P((void *));
1926 void *arg;
1927 int killable;
1928 {
1929 struct subprocess *chp;
1930
1931 ++n_children;
1932
1933 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
1934 if (chp == NULL) {
1935 warn("losing track of %s process", prog);
1936 } else {
1937 chp->pid = pid;
1938 chp->prog = prog;
1939 chp->done = done;
1940 chp->arg = arg;
1941 chp->next = children;
1942 chp->killable = killable;
1943 children = chp;
1944 }
1945 }
1946
1947 /*
1948 * childwait_end - we got fed up waiting for the child processes to
1949 * exit, send them all a SIGTERM.
1950 */
1951 static void
childwait_end(arg)1952 childwait_end(arg)
1953 void *arg;
1954 {
1955 struct subprocess *chp;
1956
1957 for (chp = children; chp != NULL; chp = chp->next) {
1958 if (debug)
1959 dbglog("sending SIGTERM to process %d", chp->pid);
1960 kill(chp->pid, SIGTERM);
1961 }
1962 childwait_done = 1;
1963 }
1964
1965 /*
1966 * forget_child - clean up after a dead child
1967 */
1968 static void
forget_child(pid,status)1969 forget_child(pid, status)
1970 int pid, status;
1971 {
1972 struct subprocess *chp, **prevp;
1973
1974 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
1975 if (chp->pid == pid) {
1976 --n_children;
1977 *prevp = chp->next;
1978 break;
1979 }
1980 }
1981 if (WIFSIGNALED(status)) {
1982 warn("Child process %s (pid %d) terminated with signal %d",
1983 (chp? chp->prog: "??"), pid, WTERMSIG(status));
1984 } else if (debug)
1985 dbglog("Script %s finished (pid %d), status = 0x%x",
1986 (chp? chp->prog: "??"), pid,
1987 WIFEXITED(status) ? WEXITSTATUS(status) : status);
1988 if (chp && chp->done)
1989 (*chp->done)(chp->arg);
1990 if (chp)
1991 free(chp);
1992 }
1993
1994 /*
1995 * reap_kids - get status from any dead child processes,
1996 * and log a message for abnormal terminations.
1997 */
1998 static int
reap_kids()1999 reap_kids()
2000 {
2001 int pid, status;
2002
2003 if (n_children == 0)
2004 return 0;
2005 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
2006 forget_child(pid, status);
2007 }
2008 if (pid == -1) {
2009 if (errno == ECHILD)
2010 return -1;
2011 if (errno != EINTR)
2012 error("Error waiting for child process: %m");
2013 }
2014 return 0;
2015 }
2016
2017 /*
2018 * add_notifier - add a new function to be called when something happens.
2019 */
2020 void
add_notifier(notif,func,arg)2021 add_notifier(notif, func, arg)
2022 struct notifier **notif;
2023 notify_func func;
2024 void *arg;
2025 {
2026 struct notifier *np;
2027
2028 np = malloc(sizeof(struct notifier));
2029 if (np == 0)
2030 novm("notifier struct");
2031 np->next = *notif;
2032 np->func = func;
2033 np->arg = arg;
2034 *notif = np;
2035 }
2036
2037 /*
2038 * remove_notifier - remove a function from the list of things to
2039 * be called when something happens.
2040 */
2041 void
remove_notifier(notif,func,arg)2042 remove_notifier(notif, func, arg)
2043 struct notifier **notif;
2044 notify_func func;
2045 void *arg;
2046 {
2047 struct notifier *np;
2048
2049 for (; (np = *notif) != 0; notif = &np->next) {
2050 if (np->func == func && np->arg == arg) {
2051 *notif = np->next;
2052 free(np);
2053 break;
2054 }
2055 }
2056 }
2057
2058 /*
2059 * notify - call a set of functions registered with add_notifier.
2060 */
2061 void
notify(notif,val)2062 notify(notif, val)
2063 struct notifier *notif;
2064 int val;
2065 {
2066 struct notifier *np;
2067
2068 while ((np = notif) != 0) {
2069 notif = np->next;
2070 (*np->func)(np->arg, val);
2071 }
2072 }
2073
2074 /*
2075 * novm - log an error message saying we ran out of memory, and die.
2076 */
2077 void
novm(msg)2078 novm(msg)
2079 char *msg;
2080 {
2081 fatal("Virtual memory exhausted allocating %s\n", msg);
2082 }
2083
2084 /*
2085 * script_setenv - set an environment variable value to be used
2086 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2087 */
2088 void
script_setenv(var,value,iskey)2089 script_setenv(var, value, iskey)
2090 char *var, *value;
2091 int iskey;
2092 {
2093 size_t varl = strlen(var);
2094 size_t vl = varl + strlen(value) + 2;
2095 int i;
2096 char *p, *newstring;
2097
2098 newstring = (char *) malloc(vl+1);
2099 if (newstring == 0)
2100 return;
2101 *newstring++ = iskey;
2102 slprintf(newstring, vl, "%s=%s", var, value);
2103
2104 /* check if this variable is already set */
2105 if (script_env != 0) {
2106 for (i = 0; (p = script_env[i]) != 0; ++i) {
2107 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2108 #ifdef USE_TDB
2109 if (p[-1] && pppdb != NULL)
2110 delete_db_key(p);
2111 #endif
2112 free(p-1);
2113 script_env[i] = newstring;
2114 #ifdef USE_TDB
2115 if (pppdb != NULL) {
2116 if (iskey)
2117 add_db_key(newstring);
2118 update_db_entry();
2119 }
2120 #endif
2121 return;
2122 }
2123 }
2124 } else {
2125 /* no space allocated for script env. ptrs. yet */
2126 i = 0;
2127 script_env = malloc(16 * sizeof(char *));
2128 if (script_env == 0) {
2129 free(newstring - 1);
2130 return;
2131 }
2132 s_env_nalloc = 16;
2133 }
2134
2135 if (!add_script_env(i, newstring))
2136 return;
2137
2138 #ifdef USE_TDB
2139 if (pppdb != NULL) {
2140 if (iskey)
2141 add_db_key(newstring);
2142 update_db_entry();
2143 }
2144 #endif
2145 }
2146
2147 /*
2148 * script_unsetenv - remove a variable from the environment
2149 * for scripts.
2150 */
2151 void
script_unsetenv(var)2152 script_unsetenv(var)
2153 char *var;
2154 {
2155 int vl = strlen(var);
2156 int i;
2157 char *p;
2158
2159 if (script_env == 0)
2160 return;
2161 for (i = 0; (p = script_env[i]) != 0; ++i) {
2162 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2163 #ifdef USE_TDB
2164 if (p[-1] && pppdb != NULL)
2165 delete_db_key(p);
2166 #endif
2167 remove_script_env(i);
2168 break;
2169 }
2170 }
2171 #ifdef USE_TDB
2172 if (pppdb != NULL)
2173 update_db_entry();
2174 #endif
2175 }
2176
2177 /*
2178 * Any arbitrary string used as a key for locking the database.
2179 * It doesn't matter what it is as long as all pppds use the same string.
2180 */
2181 #define PPPD_LOCK_KEY "pppd lock"
2182
2183 /*
2184 * lock_db - get an exclusive lock on the TDB database.
2185 * Used to ensure atomicity of various lookup/modify operations.
2186 */
lock_db()2187 void lock_db()
2188 {
2189 #ifdef USE_TDB
2190 TDB_DATA key;
2191
2192 key.dptr = PPPD_LOCK_KEY;
2193 key.dsize = strlen(key.dptr);
2194 tdb_chainlock(pppdb, key);
2195 #endif
2196 }
2197
2198 /*
2199 * unlock_db - remove the exclusive lock obtained by lock_db.
2200 */
unlock_db()2201 void unlock_db()
2202 {
2203 #ifdef USE_TDB
2204 TDB_DATA key;
2205
2206 key.dptr = PPPD_LOCK_KEY;
2207 key.dsize = strlen(key.dptr);
2208 tdb_chainunlock(pppdb, key);
2209 #endif
2210 }
2211
2212 #ifdef USE_TDB
2213 /*
2214 * update_db_entry - update our entry in the database.
2215 */
2216 static void
update_db_entry()2217 update_db_entry()
2218 {
2219 TDB_DATA key, dbuf;
2220 int vlen, i;
2221 char *p, *q, *vbuf;
2222
2223 if (script_env == NULL)
2224 return;
2225 vlen = 0;
2226 for (i = 0; (p = script_env[i]) != 0; ++i)
2227 vlen += strlen(p) + 1;
2228 vbuf = malloc(vlen + 1);
2229 if (vbuf == 0)
2230 novm("database entry");
2231 q = vbuf;
2232 for (i = 0; (p = script_env[i]) != 0; ++i)
2233 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2234
2235 key.dptr = db_key;
2236 key.dsize = strlen(db_key);
2237 dbuf.dptr = vbuf;
2238 dbuf.dsize = vlen;
2239 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2240 error("tdb_store failed: %s", tdb_errorstr(pppdb));
2241
2242 if (vbuf)
2243 free(vbuf);
2244
2245 }
2246
2247 /*
2248 * add_db_key - add a key that we can use to look up our database entry.
2249 */
2250 static void
add_db_key(str)2251 add_db_key(str)
2252 const char *str;
2253 {
2254 TDB_DATA key, dbuf;
2255
2256 key.dptr = (char *) str;
2257 key.dsize = strlen(str);
2258 dbuf.dptr = db_key;
2259 dbuf.dsize = strlen(db_key);
2260 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2261 error("tdb_store key failed: %s", tdb_errorstr(pppdb));
2262 }
2263
2264 /*
2265 * delete_db_key - delete a key for looking up our database entry.
2266 */
2267 static void
delete_db_key(str)2268 delete_db_key(str)
2269 const char *str;
2270 {
2271 TDB_DATA key;
2272
2273 key.dptr = (char *) str;
2274 key.dsize = strlen(str);
2275 tdb_delete(pppdb, key);
2276 }
2277
2278 /*
2279 * cleanup_db - delete all the entries we put in the database.
2280 */
2281 static void
cleanup_db()2282 cleanup_db()
2283 {
2284 TDB_DATA key;
2285 int i;
2286 char *p;
2287
2288 key.dptr = db_key;
2289 key.dsize = strlen(db_key);
2290 tdb_delete(pppdb, key);
2291 for (i = 0; (p = script_env[i]) != 0; ++i)
2292 if (p[-1])
2293 delete_db_key(p);
2294 }
2295 #endif /* USE_TDB */
2296