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