1 /* NetBSD: main.c,v 1.2 2013/11/28 22:33:42 christos Exp */
2
3 /*
4 * main.c - Point-to-Point Protocol main module
5 *
6 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The name "Carnegie Mellon University" must not be used to
21 * endorse or promote products derived from this software without
22 * prior written permission. For permission or any legal
23 * details, please contact
24 * Office of Technology Transfer
25 * Carnegie Mellon University
26 * 5000 Forbes Avenue
27 * Pittsburgh, PA 15213-3890
28 * (412) 268-4387, fax: (412) 268-7395
29 * tech-transfer@andrew.cmu.edu
30 *
31 * 4. Redistributions of any form whatsoever must retain the following
32 * acknowledgment:
33 * "This product includes software developed by Computing Services
34 * at Carnegie Mellon University (http://www.cmu.edu/computing/)."
35 *
36 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO
37 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
38 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE
39 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
40 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
41 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
42 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
43 *
44 * Copyright (c) 1999-2024 Paul Mackerras. All rights reserved.
45 *
46 * Redistribution and use in source and binary forms, with or without
47 * modification, are permitted provided that the following conditions
48 * are met:
49 *
50 * 1. Redistributions of source code must retain the above copyright
51 * notice, this list of conditions and the following disclaimer.
52 *
53 * 2. Redistributions in binary form must reproduce the above copyright
54 * notice, this list of conditions and the following disclaimer in
55 * the documentation and/or other materials provided with the
56 * distribution.
57 *
58 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
59 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
60 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
61 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
62 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
63 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
64 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
65 */
66
67 #include <sys/cdefs.h>
68 __RCSID("NetBSD: main.c,v 1.2 2013/11/28 22:33:42 christos Exp ");
69
70 #ifdef HAVE_CONFIG_H
71 #include "config.h"
72 #endif
73
74 #include <stdio.h>
75 #include <ctype.h>
76 #include <stdlib.h>
77 #include <string.h>
78 #include <unistd.h>
79 #include <signal.h>
80 #include <errno.h>
81 #include <fcntl.h>
82 #include <syslog.h>
83 #include <netdb.h>
84 #include <utmp.h>
85 #include <pwd.h>
86 #include <sys/param.h>
87 #include <sys/types.h>
88 #include <sys/wait.h>
89 #include <sys/time.h>
90 #include <sys/resource.h>
91 #include <sys/stat.h>
92 #include <sys/socket.h>
93 #include <netinet/in.h>
94 #include <arpa/inet.h>
95 #include <limits.h>
96 #include <inttypes.h>
97 #include <net/if.h>
98
99 #include "pppd-private.h"
100 #include "options.h"
101 #include "magic.h"
102 #include "fsm.h"
103 #include "lcp.h"
104 #include "ipcp.h"
105 #ifdef PPP_WITH_IPV6CP
106 #include "ipv6cp.h"
107 #endif
108 #include "upap.h"
109 #include "chap.h"
110 #include "eap.h"
111 #include "ccp.h"
112 #include "ecp.h"
113 #include "pathnames.h"
114 #include "crypto.h"
115 #include "multilink.h"
116
117 #ifdef PPP_WITH_TDB
118 #include "tdb.h"
119 #endif
120
121 #ifdef PPP_WITH_CBCP
122 #include "cbcp.h"
123 #endif
124
125 #ifdef AT_CHANGE
126 #include "atcp.h"
127 #endif
128
129 /* interface vars */
130 char ifname[IFNAMSIZ]; /* 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 uid_t uid; /* Our real user-id */
140 struct notifier *pidchange = NULL;
141 struct notifier *phasechange = NULL;
142 struct notifier *exitnotify = NULL;
143 struct notifier *sigreceived = NULL;
144 struct notifier *fork_notifier = NULL;
145
146 int hungup; /* terminal has been hung up */
147 int privileged; /* we're running as real uid root */
148 int need_holdoff; /* need holdoff period before restarting */
149 int detached; /* have detached from terminal */
150 volatile int code; /* exit status for pppd */
151 int unsuccess; /* # unsuccessful connection attempts */
152 int do_callback; /* != 0 if we should do callback next */
153 int doing_callback; /* != 0 if we are doing callback */
154 int ppp_session_number; /* Session number, for channels with such a
155 concept (eg PPPoE) */
156 int childwait_done; /* have timed out waiting for children */
157
158 #ifdef PPP_WITH_TDB
159 TDB_CONTEXT *pppdb; /* database for storing status etc. */
160 #endif
161
162 char db_key[32];
163
164 int (*holdoff_hook)(void) = NULL;
165 int (*new_phase_hook)(int) = NULL;
166 void (*snoop_recv_hook)(unsigned char *p, int len) = NULL;
167 void (*snoop_send_hook)(unsigned char *p, int len) = NULL;
168
169 static int conn_running; /* we have a [dis]connector running */
170 static int fd_loop; /* fd for getting demand-dial packets */
171
172 int fd_devnull; /* fd for /dev/null */
173 int devfd = -1; /* fd of underlying device */
174 int fd_ppp = -1; /* fd for talking PPP */
175 ppp_phase_t phase; /* where the link is at */
176 int kill_link;
177 int asked_to_quit;
178 int open_ccp_flag;
179 int listen_time;
180 int got_sigusr2;
181 int got_sigterm;
182 int got_sighup;
183
184 static sigset_t signals_handled;
185 static int waiting;
186 static int sigpipe[2];
187
188 char **script_env; /* Env. variable values for scripts */
189 int s_env_nalloc; /* # words avail at script_env */
190
191 u_char outpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for outgoing packet */
192 u_char inpacket_buf[PPP_MRU+PPP_HDRLEN]; /* buffer for incoming packet */
193
194 static int n_children; /* # child processes still running */
195 static int got_sigchld; /* set if we have received a SIGCHLD */
196
197 int privopen; /* don't lock, open device as root */
198
199 char *no_ppp_msg = "Sorry - this system lacks PPP kernel support\n";
200
201 GIDSET_TYPE groups[NGROUPS_MAX];/* groups the user is in */
202 int ngroups; /* How many groups valid in groups */
203
204 static struct timeval start_time; /* Time when link was started. */
205
206 static struct pppd_stats old_link_stats;
207 struct pppd_stats link_stats;
208 unsigned link_connect_time;
209 int link_stats_valid;
210 int link_stats_print;
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)(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(void);
235 static void create_pidfile(int pid);
236 static void create_linkpidfile(int pid);
237 static void cleanup(void);
238 static void get_input(void);
239 static void calltimeout(void);
240 static struct timeval *timeleft(struct timeval *);
241 static void kill_my_pg(int);
242 static void hup(int);
243 static void term(int);
244 static void chld(int);
245 static void toggle_debug(int);
246 static void open_ccp(int);
247 static void bad_signal(int);
248 static void holdoff_end(void *);
249 static void forget_child(int pid, int status);
250 static int reap_kids(void);
251 static void childwait_end(void *);
252 static void run_net_script(char* script, int wait);
253
254 #ifdef PPP_WITH_TDB
255 static void update_db_entry(void);
256 static void add_db_key(const char *);
257 static void delete_db_key(const char *);
258 static void cleanup_db(void);
259 #endif
260
261 static void handle_events(void);
262 void print_link_stats(void);
263
264 extern char *getlogin(void);
265 int main(int, char *[]);
266
ppp_hostname()267 const char *ppp_hostname()
268 {
269 return hostname;
270 }
271
ppp_signaled(int sig)272 bool ppp_signaled(int sig)
273 {
274 if (sig == SIGTERM)
275 return !!got_sigterm;
276 if (sig == SIGUSR2)
277 return !!got_sigusr2;
278 if (sig == SIGHUP)
279 return !!got_sighup;
280 return false;
281 }
282
ppp_status()283 ppp_exit_code_t ppp_status()
284 {
285 return code;
286 }
287
ppp_set_status(ppp_exit_code_t value)288 void ppp_set_status(ppp_exit_code_t value)
289 {
290 code = value;
291 }
292
ppp_set_session_number(int number)293 void ppp_set_session_number(int number)
294 {
295 ppp_session_number = number;
296 }
297
ppp_get_session_number()298 int ppp_get_session_number()
299 {
300 return ppp_session_number;
301 }
302
ppp_ifname()303 const char *ppp_ifname()
304 {
305 return ifname;
306 }
307
ppp_get_ifname(char * buf,size_t bufsz)308 int ppp_get_ifname(char *buf, size_t bufsz)
309 {
310 if (buf) {
311 return strlcpy(buf, ifname, bufsz);
312 }
313 return false;
314 }
315
ppp_set_ifname(const char * name)316 void ppp_set_ifname(const char *name)
317 {
318 if (name) {
319 strlcpy(ifname, name, sizeof(ifname));
320 }
321 }
322
ppp_ifunit()323 int ppp_ifunit()
324 {
325 return ifunit;
326 }
327
ppp_get_link_uptime()328 int ppp_get_link_uptime()
329 {
330 return link_connect_time;
331 }
332
333 /*
334 * PPP Data Link Layer "protocol" table.
335 * One entry per supported protocol.
336 * The last entry must be NULL.
337 */
338 struct protent *protocols[] = {
339 &lcp_protent,
340 &pap_protent,
341 &chap_protent,
342 #ifdef PPP_WITH_CBCP
343 &cbcp_protent,
344 #endif
345 &ipcp_protent,
346 #ifdef PPP_WITH_IPV6CP
347 &ipv6cp_protent,
348 #endif
349 &ccp_protent,
350 &ecp_protent,
351 #ifdef AT_CHANGE
352 &atcp_protent,
353 #endif
354 &eap_protent,
355 NULL
356 };
357
358 int
main(int argc,char * argv[])359 main(int argc, char *argv[])
360 {
361 int i, t;
362 char *p;
363 struct passwd *pw;
364 struct protent *protp;
365 char numbuf[16];
366
367 strlcpy(path_upapfile, PPP_PATH_UPAPFILE, MAXPATHLEN);
368 strlcpy(path_chapfile, PPP_PATH_CHAPFILE, MAXPATHLEN);
369
370 strlcpy(path_net_init, PPP_PATH_NET_INIT, MAXPATHLEN);
371 strlcpy(path_net_preup, PPP_PATH_NET_PREUP, MAXPATHLEN);
372 strlcpy(path_net_down, PPP_PATH_NET_DOWN, MAXPATHLEN);
373
374 strlcpy(path_ipup, PPP_PATH_IPUP, MAXPATHLEN);
375 strlcpy(path_ipdown, PPP_PATH_IPDOWN, MAXPATHLEN);
376 strlcpy(path_ippreup, PPP_PATH_IPPREUP, MAXPATHLEN);
377
378 #ifdef PPP_WITH_IPV6CP
379 strlcpy(path_ipv6up, PPP_PATH_IPV6UP, MAXPATHLEN);
380 strlcpy(path_ipv6down, PPP_PATH_IPV6DOWN, MAXPATHLEN);
381 #endif
382 link_stats_valid = 0;
383 link_stats_print = 1;
384 new_phase(PHASE_INITIALIZE);
385
386 script_env = NULL;
387
388 /* Initialize syslog facilities */
389 reopen_log();
390
391 /* Initialize crypto libraries */
392 if (!PPP_crypto_init()) {
393 exit(1);
394 }
395
396 if (gethostname(hostname, sizeof(hostname)) < 0 ) {
397 ppp_option_error("Couldn't get hostname: %m");
398 exit(1);
399 }
400 hostname[MAXNAMELEN-1] = 0;
401
402 /* make sure we don't create world or group writable files. */
403 umask(umask(0777) | 022);
404
405 uid = getuid();
406 privileged = uid == 0;
407 slprintf(numbuf, sizeof(numbuf), "%d", uid);
408 ppp_script_setenv("ORIG_UID", numbuf, 0);
409
410 ngroups = getgroups(NGROUPS_MAX, groups);
411
412 /*
413 * Initialize magic number generator now so that protocols may
414 * use magic numbers in initialization.
415 */
416 magic_init();
417
418 /*
419 * Initialize each protocol.
420 */
421 for (i = 0; (protp = protocols[i]) != NULL; ++i)
422 (*protp->init)(0);
423
424 /*
425 * Initialize the default channel.
426 */
427 tty_init();
428
429 progname = *argv;
430
431 /*
432 * Parse, in order, the system options file, the user's options file,
433 * and the command line arguments.
434 */
435 if (!ppp_options_from_file(PPP_PATH_SYSOPTIONS, !privileged, 0, 1)
436 || !options_from_user()
437 || !parse_args(argc-1, argv+1))
438 exit(EXIT_OPTION_ERROR);
439 devnam_fixed = 1; /* can no longer change device name */
440
441 /*
442 * Work out the device name, if it hasn't already been specified,
443 * and parse the tty's options file.
444 */
445 if (the_channel->process_extra_options)
446 (*the_channel->process_extra_options)();
447
448 if (debug)
449 setlogmask(LOG_UPTO(LOG_DEBUG));
450
451 if (show_options) {
452 showopts();
453 die(0);
454 }
455
456 /*
457 * Check that we are running as root.
458 */
459 if (geteuid() != 0) {
460 ppp_option_error("must be root to run %s, since it is not setuid-root",
461 argv[0]);
462 exit(EXIT_NOT_ROOT);
463 }
464
465 if (!ppp_check_kernel_support()) {
466 ppp_option_error("%s", no_ppp_msg);
467 exit(EXIT_NO_KERNEL_SUPPORT);
468 }
469
470 /*
471 * Check that the options given are valid and consistent.
472 */
473 check_options();
474 if (!sys_check_options())
475 exit(EXIT_OPTION_ERROR);
476 auth_check_options();
477 mp_check_options();
478 for (i = 0; (protp = protocols[i]) != NULL; ++i)
479 if (protp->check_options != NULL)
480 (*protp->check_options)();
481 if (the_channel->check_options)
482 (*the_channel->check_options)();
483
484
485 if (dump_options || dryrun) {
486 init_pr_log(NULL, LOG_INFO);
487 print_options(pr_log, NULL);
488 end_pr_log();
489 }
490
491 if (dryrun)
492 die(0);
493
494 /* Make sure fds 0, 1, 2 are open to somewhere. */
495 fd_devnull = open(PPP_DEVNULL, O_RDWR);
496 if (fd_devnull < 0)
497 fatal("Couldn't open %s: %m", PPP_DEVNULL);
498 while (fd_devnull <= 2) {
499 i = dup(fd_devnull);
500 if (i < 0)
501 fatal("Critical shortage of file descriptors: dup failed: %m");
502 fd_devnull = i;
503 }
504
505 /*
506 * Initialize system-dependent stuff.
507 */
508 sys_init();
509
510 #ifdef PPP_WITH_TDB
511 pppdb = tdb_open(PPP_PATH_PPPDB, 0, 0, O_RDWR|O_CREAT, 0644);
512 if (pppdb != NULL) {
513 slprintf(db_key, sizeof(db_key), "pppd%d", getpid());
514 update_db_entry();
515 } else {
516 warn("Warning: couldn't open ppp database %s", PPP_PATH_PPPDB);
517 if (multilink) {
518 warn("Warning: disabling multilink");
519 multilink = 0;
520 }
521 }
522 #endif
523
524 /*
525 * Detach ourselves from the terminal, if required,
526 * and identify who is running us.
527 */
528 if (!nodetach && !updetach)
529 detach();
530 p = getlogin();
531 if (p == NULL) {
532 pw = getpwuid(uid);
533 if (pw != NULL && pw->pw_name != NULL)
534 p = pw->pw_name;
535 else
536 p = "(unknown)";
537 }
538 syslog(LOG_NOTICE, "pppd %s started by %s, uid %d", VERSION, p, uid);
539 ppp_script_setenv("PPPLOGNAME", p, 0);
540
541 if (devnam[0])
542 ppp_script_setenv("DEVICE", devnam, 1);
543 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
544 ppp_script_setenv("PPPD_PID", numbuf, 1);
545
546 setup_signals();
547
548 create_linkpidfile(getpid());
549
550 waiting = 0;
551
552 /*
553 * If we're doing dial-on-demand, set up the interface now.
554 */
555 if (demand) {
556 /*
557 * Open the loopback channel and set it up to be the ppp interface.
558 */
559 fd_loop = open_ppp_loopback();
560 set_ifunit(1);
561 /*
562 * Configure the interface and mark it up, etc.
563 */
564 demand_conf();
565 }
566
567 do_callback = 0;
568 for (;;) {
569
570 bundle_eof = 0;
571 bundle_terminating = 0;
572 listen_time = 0;
573 need_holdoff = 1;
574 devfd = -1;
575 code = EXIT_OK;
576 ++unsuccess;
577 doing_callback = do_callback;
578 do_callback = 0;
579
580 if (demand && !doing_callback) {
581 /*
582 * Don't do anything until we see some activity.
583 */
584 new_phase(PHASE_DORMANT);
585 demand_unblock();
586 add_fd(fd_loop);
587 for (;;) {
588 handle_events();
589 if (asked_to_quit)
590 break;
591 if (get_loop_output())
592 break;
593 }
594 remove_fd(fd_loop);
595 if (asked_to_quit)
596 break;
597
598 /*
599 * Now we want to bring up the link.
600 */
601 demand_block();
602 info("Starting link");
603 }
604
605 ppp_get_time(&start_time);
606 ppp_script_unsetenv("CONNECT_TIME");
607 ppp_script_unsetenv("BYTES_SENT");
608 ppp_script_unsetenv("BYTES_RCVD");
609
610 lcp_open(0); /* Start protocol */
611 start_link(0);
612 while (phase != PHASE_DEAD) {
613 handle_events();
614 get_input();
615 if (kill_link) {
616 lcp_close(0, "User request");
617 need_holdoff = 0;
618 }
619 if (asked_to_quit) {
620 bundle_terminating = 1;
621 if (phase == PHASE_MASTER)
622 mp_bundle_terminated();
623 }
624 if (open_ccp_flag) {
625 if (phase == PHASE_NETWORK || phase == PHASE_RUNNING) {
626 ccp_fsm[0].flags = OPT_RESTART; /* clears OPT_SILENT */
627 (*ccp_protent.open)(0);
628 }
629 }
630 }
631 /* restore FSMs to original state */
632 lcp_close(0, "");
633
634 if (!persist || asked_to_quit || (maxfail > 0 && unsuccess >= maxfail))
635 break;
636
637 if (demand)
638 demand_discard();
639 t = need_holdoff? holdoff: 0;
640 if (holdoff_hook)
641 t = (*holdoff_hook)();
642 if (t > 0) {
643 new_phase(PHASE_HOLDOFF);
644 TIMEOUT(holdoff_end, NULL, t);
645 do {
646 handle_events();
647 if (kill_link)
648 new_phase(PHASE_DORMANT); /* allow signal to end holdoff */
649 } while (phase == PHASE_HOLDOFF);
650 if (!persist)
651 break;
652 }
653 }
654
655 /* Wait for scripts to finish */
656 reap_kids();
657 if (n_children > 0) {
658 if (child_wait > 0)
659 TIMEOUT(childwait_end, NULL, child_wait);
660 if (debug) {
661 struct subprocess *chp;
662 dbglog("Waiting for %d child processes...", n_children);
663 for (chp = children; chp != NULL; chp = chp->next)
664 dbglog(" script %s, pid %d", chp->prog, chp->pid);
665 }
666 while (n_children > 0 && !childwait_done) {
667 handle_events();
668 if (kill_link && !childwait_done)
669 childwait_end(NULL);
670 }
671 }
672
673 PPP_crypto_deinit();
674 die(code);
675 return 0;
676 }
677
678 /*
679 * handle_events - wait for something to happen and respond to it.
680 */
681 static void
handle_events(void)682 handle_events(void)
683 {
684 struct timeval timo;
685 unsigned char buf[16];
686
687 kill_link = open_ccp_flag = 0;
688
689 /* alert via signal pipe */
690 waiting = 1;
691 /* flush signal pipe */
692 for (; read(sigpipe[0], buf, sizeof(buf)) > 0; );
693 add_fd(sigpipe[0]);
694 /* wait if necessary */
695 if (!(got_sighup || got_sigterm || got_sigusr2 || got_sigchld))
696 wait_input(timeleft(&timo));
697 waiting = 0;
698 remove_fd(sigpipe[0]);
699
700 calltimeout();
701 if (got_sighup) {
702 info("Hangup (SIGHUP)");
703 kill_link = 1;
704 got_sighup = 0;
705 if (code != EXIT_HANGUP)
706 code = EXIT_USER_REQUEST;
707 }
708 if (got_sigterm) {
709 info("Terminating on signal %d", got_sigterm);
710 kill_link = 1;
711 asked_to_quit = 1;
712 persist = 0;
713 code = EXIT_USER_REQUEST;
714 got_sigterm = 0;
715 }
716 if (got_sigchld) {
717 got_sigchld = 0;
718 reap_kids(); /* Don't leave dead kids lying around */
719 }
720 if (got_sigusr2) {
721 open_ccp_flag = 1;
722 got_sigusr2 = 0;
723 }
724 }
725
726 /*
727 * setup_signals - initialize signal handling.
728 */
729 static void
setup_signals(void)730 setup_signals(void)
731 {
732 struct sigaction sa;
733
734 /* create pipe to wake up event handler from signal handler */
735 if (pipe(sigpipe) < 0)
736 fatal("Couldn't create signal pipe: %m");
737 fcntl(sigpipe[0], F_SETFD, fcntl(sigpipe[0], F_GETFD) | FD_CLOEXEC);
738 fcntl(sigpipe[1], F_SETFD, fcntl(sigpipe[1], F_GETFD) | FD_CLOEXEC);
739 fcntl(sigpipe[0], F_SETFL, fcntl(sigpipe[0], F_GETFL) | O_NONBLOCK);
740 fcntl(sigpipe[1], F_SETFL, fcntl(sigpipe[1], F_GETFL) | O_NONBLOCK);
741
742 /*
743 * Compute mask of all interesting signals and install signal handlers
744 * for each. Only one signal handler may be active at a time. Therefore,
745 * all other signals should be masked when any handler is executing.
746 */
747 sigemptyset(&signals_handled);
748 sigaddset(&signals_handled, SIGHUP);
749 sigaddset(&signals_handled, SIGINT);
750 sigaddset(&signals_handled, SIGTERM);
751 sigaddset(&signals_handled, SIGCHLD);
752 sigaddset(&signals_handled, SIGUSR2);
753
754 #define SIGNAL(s, handler) do { \
755 sa.sa_handler = handler; \
756 if (sigaction(s, &sa, NULL) < 0) \
757 fatal("Couldn't establish signal handler (%d): %m", s); \
758 } while (0)
759
760 sa.sa_mask = signals_handled;
761 sa.sa_flags = 0;
762 SIGNAL(SIGHUP, hup); /* Hangup */
763 SIGNAL(SIGINT, term); /* Interrupt */
764 SIGNAL(SIGTERM, term); /* Terminate */
765 SIGNAL(SIGCHLD, chld);
766
767 SIGNAL(SIGUSR1, toggle_debug); /* Toggle debug flag */
768 SIGNAL(SIGUSR2, open_ccp); /* Reopen CCP */
769
770 /*
771 * Install a handler for other signals which would otherwise
772 * cause pppd to exit without cleaning up.
773 */
774 SIGNAL(SIGABRT, bad_signal);
775 SIGNAL(SIGALRM, bad_signal);
776 SIGNAL(SIGFPE, bad_signal);
777 SIGNAL(SIGILL, bad_signal);
778 SIGNAL(SIGPIPE, bad_signal);
779 SIGNAL(SIGQUIT, bad_signal);
780 SIGNAL(SIGSEGV, bad_signal);
781 #ifdef SIGBUS
782 SIGNAL(SIGBUS, bad_signal);
783 #endif
784 #ifdef SIGEMT
785 SIGNAL(SIGEMT, bad_signal);
786 #endif
787 #ifdef SIGPOLL
788 SIGNAL(SIGPOLL, bad_signal);
789 #endif
790 #ifdef SIGPROF
791 SIGNAL(SIGPROF, bad_signal);
792 #endif
793 #ifdef SIGSYS
794 SIGNAL(SIGSYS, bad_signal);
795 #endif
796 #ifdef SIGTRAP
797 SIGNAL(SIGTRAP, bad_signal);
798 #endif
799 #ifdef SIGVTALRM
800 SIGNAL(SIGVTALRM, bad_signal);
801 #endif
802 #ifdef SIGXCPU
803 SIGNAL(SIGXCPU, bad_signal);
804 #endif
805 #ifdef SIGXFSZ
806 SIGNAL(SIGXFSZ, bad_signal);
807 #endif
808
809 /*
810 * Apparently we can get a SIGPIPE when we call syslog, if
811 * syslogd has died and been restarted. Ignoring it seems
812 * be sufficient.
813 */
814 signal(SIGPIPE, SIG_IGN);
815 }
816
817 /*
818 * net-* scripts to be run come through here.
819 */
run_net_script(char * script,int wait)820 void run_net_script(char* script, int wait)
821 {
822 char strspeed[32];
823 char *argv[6];
824
825 slprintf(strspeed, sizeof(strspeed), "%d", baud_rate);
826
827 argv[0] = script;
828 argv[1] = ifname;
829 argv[2] = devnam;
830 argv[3] = strspeed;
831 argv[4] = ipparam;
832 argv[5] = NULL;
833
834 run_program(script, argv, 0, NULL, NULL, wait);
835 }
836
837 /*
838 * set_ifunit - do things we need to do once we know which ppp
839 * unit we are using.
840 */
841 void
set_ifunit(int iskey)842 set_ifunit(int iskey)
843 {
844 char ifkey[32];
845
846 if (req_ifname[0] != '\0')
847 slprintf(ifname, sizeof(ifname), "%s", req_ifname);
848 else
849 slprintf(ifname, sizeof(ifname), "%s%d", PPP_DRV_NAME, ifunit);
850 info("Using interface %s", ifname);
851 ppp_script_setenv("IFNAME", ifname, iskey);
852 slprintf(ifkey, sizeof(ifkey), "%d", ifunit);
853 ppp_script_setenv("UNIT", ifkey, iskey);
854 if (iskey) {
855 create_pidfile(getpid()); /* write pid to file */
856 create_linkpidfile(getpid());
857 }
858 if (*remote_number)
859 ppp_script_setenv("REMOTENUMBER", remote_number, 0);
860 run_net_script(path_net_init, 1);
861 }
862
863 /*
864 * detach - detach us from the controlling terminal.
865 */
866 void
detach(void)867 detach(void)
868 {
869 int pid;
870 int ret;
871 char numbuf[16];
872 int pipefd[2];
873
874 if (detached)
875 return;
876 if (pipe(pipefd) == -1)
877 pipefd[0] = pipefd[1] = -1;
878 if ((pid = fork()) < 0) {
879 error("Couldn't detach (fork failed: %m)");
880 die(1); /* or just return? */
881 }
882 if (pid != 0) {
883 /* parent */
884 notify(pidchange, pid);
885 /* update pid files if they have been written already */
886 if (pidfilename[0])
887 create_pidfile(pid);
888 create_linkpidfile(pid);
889 exit(0); /* parent dies */
890 }
891 setsid();
892 ret = chdir("/");
893 if (ret != 0) {
894 fatal("Could not change directory to '/', %m");
895 }
896 dup2(fd_devnull, 0);
897 dup2(fd_devnull, 1);
898 dup2(fd_devnull, 2);
899 detached = 1;
900 if (log_default)
901 log_to_fd = -1;
902 slprintf(numbuf, sizeof(numbuf), "%d", getpid());
903 ppp_script_setenv("PPPD_PID", numbuf, 1);
904
905 /* wait for parent to finish updating pid & lock files and die */
906 close(pipefd[1]);
907 complete_read(pipefd[0], numbuf, 1);
908 close(pipefd[0]);
909 }
910
911 /*
912 * reopen_log - (re)open our connection to syslog.
913 */
914 void
reopen_log(void)915 reopen_log(void)
916 {
917 openlog("pppd", LOG_PID | LOG_NDELAY, LOG_PPP);
918 setlogmask(LOG_UPTO(LOG_INFO));
919 }
920
921 /*
922 * Create a file containing our process ID.
923 */
924 static void
create_pidfile(int pid)925 create_pidfile(int pid)
926 {
927 FILE *pidfile;
928
929 mkdir_recursive(PPP_PATH_VARRUN);
930 slprintf(pidfilename, sizeof(pidfilename), "%s/%s.pid",
931 PPP_PATH_VARRUN, ifname);
932 if ((pidfile = fopen(pidfilename, "w")) != NULL) {
933 fprintf(pidfile, "%d\n", pid);
934 (void) fclose(pidfile);
935 } else {
936 error("Failed to create pid file %s: %m", pidfilename);
937 pidfilename[0] = 0;
938 }
939 }
940
941 void
create_linkpidfile(int pid)942 create_linkpidfile(int pid)
943 {
944 FILE *pidfile;
945
946 if (linkname[0] == 0)
947 return;
948 ppp_script_setenv("LINKNAME", linkname, 1);
949 slprintf(linkpidfile, sizeof(linkpidfile), "%s/ppp-%s.pid",
950 PPP_PATH_VARRUN, linkname);
951 if ((pidfile = fopen(linkpidfile, "w")) != NULL) {
952 fprintf(pidfile, "%d\n", pid);
953 if (ifname[0])
954 fprintf(pidfile, "%s\n", ifname);
955 (void) fclose(pidfile);
956 } else {
957 error("Failed to create pid file %s: %m", linkpidfile);
958 linkpidfile[0] = 0;
959 }
960 }
961
962 /*
963 * remove_pidfile - remove our pid files
964 */
remove_pidfiles(void)965 void remove_pidfiles(void)
966 {
967 if (pidfilename[0] != 0 && unlink(pidfilename) < 0 && errno != ENOENT)
968 warn("unable to delete pid file %s: %m", pidfilename);
969 pidfilename[0] = 0;
970 if (linkpidfile[0] != 0 && unlink(linkpidfile) < 0 && errno != ENOENT)
971 warn("unable to delete pid file %s: %m", linkpidfile);
972 linkpidfile[0] = 0;
973 }
974
975 /*
976 * holdoff_end - called via a timeout when the holdoff period ends.
977 */
978 static void
holdoff_end(void * arg)979 holdoff_end(void *arg)
980 {
981 new_phase(PHASE_DORMANT);
982 }
983
984 /* List of protocol names, to make our messages a little more informative. */
985 struct protocol_list {
986 u_short proto;
987 const char *name;
988 } protocol_list[] = {
989 { 0x21, "IP" },
990 { 0x23, "OSI Network Layer" },
991 { 0x25, "Xerox NS IDP" },
992 { 0x27, "DECnet Phase IV" },
993 { 0x29, "Appletalk" },
994 { 0x2b, "Novell IPX" },
995 { 0x2d, "VJ compressed TCP/IP" },
996 { 0x2f, "VJ uncompressed TCP/IP" },
997 { 0x31, "Bridging PDU" },
998 { 0x33, "Stream Protocol ST-II" },
999 { 0x35, "Banyan Vines" },
1000 { 0x39, "AppleTalk EDDP" },
1001 { 0x3b, "AppleTalk SmartBuffered" },
1002 { 0x3d, "Multi-Link" },
1003 { 0x3f, "NETBIOS Framing" },
1004 { 0x41, "Cisco Systems" },
1005 { 0x43, "Ascom Timeplex" },
1006 { 0x45, "Fujitsu Link Backup and Load Balancing (LBLB)" },
1007 { 0x47, "DCA Remote Lan" },
1008 { 0x49, "Serial Data Transport Protocol (PPP-SDTP)" },
1009 { 0x4b, "SNA over 802.2" },
1010 { 0x4d, "SNA" },
1011 { 0x4f, "IP6 Header Compression" },
1012 { 0x51, "KNX Bridging Data" },
1013 { 0x53, "Encryption" },
1014 { 0x55, "Individual Link Encryption" },
1015 { 0x57, "IPv6" },
1016 { 0x59, "PPP Muxing" },
1017 { 0x5b, "Vendor-Specific Network Protocol" },
1018 { 0x61, "RTP IPHC Full Header" },
1019 { 0x63, "RTP IPHC Compressed TCP" },
1020 { 0x65, "RTP IPHC Compressed non-TCP" },
1021 { 0x67, "RTP IPHC Compressed UDP 8" },
1022 { 0x69, "RTP IPHC Compressed RTP 8" },
1023 { 0x6f, "Stampede Bridging" },
1024 { 0x73, "MP+" },
1025 { 0xc1, "NTCITS IPI" },
1026 { 0xfb, "single-link compression" },
1027 { 0xfd, "Compressed Datagram" },
1028 { 0x0201, "802.1d Hello Packets" },
1029 { 0x0203, "IBM Source Routing BPDU" },
1030 { 0x0205, "DEC LANBridge100 Spanning Tree" },
1031 { 0x0207, "Cisco Discovery Protocol" },
1032 { 0x0209, "Netcs Twin Routing" },
1033 { 0x020b, "STP - Scheduled Transfer Protocol" },
1034 { 0x020d, "EDP - Extreme Discovery Protocol" },
1035 { 0x0211, "Optical Supervisory Channel Protocol" },
1036 { 0x0213, "Optical Supervisory Channel Protocol" },
1037 { 0x0231, "Luxcom" },
1038 { 0x0233, "Sigma Network Systems" },
1039 { 0x0235, "Apple Client Server Protocol" },
1040 { 0x0281, "MPLS Unicast" },
1041 { 0x0283, "MPLS Multicast" },
1042 { 0x0285, "IEEE p1284.4 standard - data packets" },
1043 { 0x0287, "ETSI TETRA Network Protocol Type 1" },
1044 { 0x0289, "Multichannel Flow Treatment Protocol" },
1045 { 0x2063, "RTP IPHC Compressed TCP No Delta" },
1046 { 0x2065, "RTP IPHC Context State" },
1047 { 0x2067, "RTP IPHC Compressed UDP 16" },
1048 { 0x2069, "RTP IPHC Compressed RTP 16" },
1049 { 0x4001, "Cray Communications Control Protocol" },
1050 { 0x4003, "CDPD Mobile Network Registration Protocol" },
1051 { 0x4005, "Expand accelerator protocol" },
1052 { 0x4007, "ODSICP NCP" },
1053 { 0x4009, "DOCSIS DLL" },
1054 { 0x400B, "Cetacean Network Detection Protocol" },
1055 { 0x4021, "Stacker LZS" },
1056 { 0x4023, "RefTek Protocol" },
1057 { 0x4025, "Fibre Channel" },
1058 { 0x4027, "EMIT Protocols" },
1059 { 0x405b, "Vendor-Specific Protocol (VSP)" },
1060 { 0x8021, "Internet Protocol Control Protocol" },
1061 { 0x8023, "OSI Network Layer Control Protocol" },
1062 { 0x8025, "Xerox NS IDP Control Protocol" },
1063 { 0x8027, "DECnet Phase IV Control Protocol" },
1064 { 0x8029, "Appletalk Control Protocol" },
1065 { 0x802b, "Novell IPX Control Protocol" },
1066 { 0x8031, "Bridging NCP" },
1067 { 0x8033, "Stream Protocol Control Protocol" },
1068 { 0x8035, "Banyan Vines Control Protocol" },
1069 { 0x803d, "Multi-Link Control Protocol" },
1070 { 0x803f, "NETBIOS Framing Control Protocol" },
1071 { 0x8041, "Cisco Systems Control Protocol" },
1072 { 0x8043, "Ascom Timeplex" },
1073 { 0x8045, "Fujitsu LBLB Control Protocol" },
1074 { 0x8047, "DCA Remote Lan Network Control Protocol (RLNCP)" },
1075 { 0x8049, "Serial Data Control Protocol (PPP-SDCP)" },
1076 { 0x804b, "SNA over 802.2 Control Protocol" },
1077 { 0x804d, "SNA Control Protocol" },
1078 { 0x804f, "IP6 Header Compression Control Protocol" },
1079 { 0x8051, "KNX Bridging Control Protocol" },
1080 { 0x8053, "Encryption Control Protocol" },
1081 { 0x8055, "Individual Link Encryption Control Protocol" },
1082 { 0x8057, "IPv6 Control Protocol" },
1083 { 0x8059, "PPP Muxing Control Protocol" },
1084 { 0x805b, "Vendor-Specific Network Control Protocol (VSNCP)" },
1085 { 0x806f, "Stampede Bridging Control Protocol" },
1086 { 0x8073, "MP+ Control Protocol" },
1087 { 0x80c1, "NTCITS IPI Control Protocol" },
1088 { 0x80fb, "Single Link Compression Control Protocol" },
1089 { 0x80fd, "Compression Control Protocol" },
1090 { 0x8207, "Cisco Discovery Protocol Control" },
1091 { 0x8209, "Netcs Twin Routing" },
1092 { 0x820b, "STP - Control Protocol" },
1093 { 0x820d, "EDPCP - Extreme Discovery Protocol Ctrl Prtcl" },
1094 { 0x8235, "Apple Client Server Protocol Control" },
1095 { 0x8281, "MPLSCP" },
1096 { 0x8285, "IEEE p1284.4 standard - Protocol Control" },
1097 { 0x8287, "ETSI TETRA TNP1 Control Protocol" },
1098 { 0x8289, "Multichannel Flow Treatment Protocol" },
1099 { 0xc021, "Link Control Protocol" },
1100 { 0xc023, "Password Authentication Protocol" },
1101 { 0xc025, "Link Quality Report" },
1102 { 0xc027, "Shiva Password Authentication Protocol" },
1103 { 0xc029, "CallBack Control Protocol (CBCP)" },
1104 { 0xc02b, "BACP Bandwidth Allocation Control Protocol" },
1105 { 0xc02d, "BAP" },
1106 { 0xc05b, "Vendor-Specific Authentication Protocol (VSAP)" },
1107 { 0xc081, "Container Control Protocol" },
1108 { 0xc223, "Challenge Handshake Authentication Protocol" },
1109 { 0xc225, "RSA Authentication Protocol" },
1110 { 0xc227, "Extensible Authentication Protocol" },
1111 { 0xc229, "Mitsubishi Security Info Exch Ptcl (SIEP)" },
1112 { 0xc26f, "Stampede Bridging Authorization Protocol" },
1113 { 0xc281, "Proprietary Authentication Protocol" },
1114 { 0xc283, "Proprietary Authentication Protocol" },
1115 { 0xc481, "Proprietary Node ID Authentication Protocol" },
1116 { 0, NULL },
1117 };
1118
1119 /*
1120 * protocol_name - find a name for a PPP protocol.
1121 */
1122 const char *
protocol_name(int proto)1123 protocol_name(int proto)
1124 {
1125 struct protocol_list *lp;
1126
1127 for (lp = protocol_list; lp->proto != 0; ++lp)
1128 if (proto == lp->proto)
1129 return lp->name;
1130 return NULL;
1131 }
1132
1133 /*
1134 * get_input - called when incoming data is available.
1135 */
1136 static void
get_input(void)1137 get_input(void)
1138 {
1139 int len, i;
1140 u_char *p;
1141 u_short protocol;
1142 struct protent *protp;
1143
1144 p = inpacket_buf; /* point to beginning of packet buffer */
1145
1146 len = read_packet(inpacket_buf);
1147 if (len < 0)
1148 return;
1149
1150 if (len == 0) {
1151 if (bundle_eof && mp_master()) {
1152 notice("Last channel has disconnected");
1153 mp_bundle_terminated();
1154 return;
1155 }
1156 notice("Modem hangup");
1157 hungup = 1;
1158 code = EXIT_HANGUP;
1159 need_holdoff = 0;
1160 lcp_lowerdown(0); /* serial link is no longer available */
1161 link_terminated(0);
1162 return;
1163 }
1164
1165 if (len < PPP_HDRLEN) {
1166 dbglog("received short packet:%.*B", len, p);
1167 return;
1168 }
1169
1170 dump_packet("rcvd", p, len);
1171 if (snoop_recv_hook) snoop_recv_hook(p, len);
1172
1173 p += 2; /* Skip address and control */
1174 GETSHORT(protocol, p);
1175 len -= PPP_HDRLEN;
1176
1177 /*
1178 * Toss all non-LCP packets unless LCP is OPEN.
1179 */
1180 if (protocol != PPP_LCP && lcp_fsm[0].state != OPENED) {
1181 dbglog("Discarded non-LCP packet when LCP not open");
1182 return;
1183 }
1184
1185 /*
1186 * Until we get past the authentication phase, toss all packets
1187 * except LCP, LQR and authentication packets.
1188 */
1189 if (phase <= PHASE_AUTHENTICATE
1190 && !(protocol == PPP_LCP || protocol == PPP_LQR
1191 || protocol == PPP_PAP || protocol == PPP_CHAP ||
1192 protocol == PPP_EAP)) {
1193 dbglog("discarding proto 0x%x in phase %d",
1194 protocol, phase);
1195 return;
1196 }
1197
1198 /*
1199 * Upcall the proper protocol input routine.
1200 */
1201 for (i = 0; (protp = protocols[i]) != NULL; ++i) {
1202 if (protp->protocol == protocol && protp->enabled_flag) {
1203 (*protp->input)(0, p, len);
1204 return;
1205 }
1206 if (protocol == (protp->protocol & ~0x8000) && protp->enabled_flag
1207 && protp->datainput != NULL) {
1208 (*protp->datainput)(0, p, len);
1209 return;
1210 }
1211 }
1212
1213 if (debug) {
1214 const char *pname = protocol_name(protocol);
1215 if (pname != NULL)
1216 warn("Unsupported protocol '%s' (0x%x) received", pname, protocol);
1217 else
1218 warn("Unsupported protocol 0x%x received", protocol);
1219 }
1220 lcp_sprotrej(0, p - PPP_HDRLEN, len + PPP_HDRLEN);
1221 }
1222
1223 /*
1224 * ppp_send_config - configure the transmit-side characteristics of
1225 * the ppp interface. Returns -1, indicating an error, if the channel
1226 * send_config procedure called error() (or incremented error_count
1227 * itself), otherwise 0.
1228 */
1229 int
ppp_send_config(int unit,int mtu,u_int32_t accm,int pcomp,int accomp)1230 ppp_send_config(int unit, int mtu, u_int32_t accm, int pcomp, int accomp)
1231 {
1232 int errs;
1233
1234 if (the_channel->send_config == NULL)
1235 return 0;
1236 errs = error_count;
1237 (*the_channel->send_config)(mtu, accm, pcomp, accomp);
1238 return (error_count != errs)? -1: 0;
1239 }
1240
1241 /*
1242 * ppp_recv_config - configure the receive-side characteristics of
1243 * the ppp interface. Returns -1, indicating an error, if the channel
1244 * recv_config procedure called error() (or incremented error_count
1245 * itself), otherwise 0.
1246 */
1247 int
ppp_recv_config(int unit,int mru,u_int32_t accm,int pcomp,int accomp)1248 ppp_recv_config(int unit, int mru, u_int32_t accm, int pcomp, int accomp)
1249 {
1250 int errs;
1251
1252 if (the_channel->recv_config == NULL)
1253 return 0;
1254 errs = error_count;
1255 (*the_channel->recv_config)(mru, accm, pcomp, accomp);
1256 return (error_count != errs)? -1: 0;
1257 }
1258
1259 /*
1260 * new_phase - signal the start of a new phase of pppd's operation.
1261 */
1262 void
new_phase(ppp_phase_t p)1263 new_phase(ppp_phase_t p)
1264 {
1265 switch (p) {
1266 case PHASE_NETWORK:
1267 if (phase <= PHASE_NETWORK) {
1268 char iftmpname[IFNAMSIZ];
1269 int ifindex = if_nametoindex(ifname);
1270 run_net_script(path_net_preup, 1);
1271 if (if_indextoname(ifindex, iftmpname) && strcmp(iftmpname, ifname)) {
1272 info("Detected interface name change from %s to %s.", ifname, iftmpname);
1273 strcpy(ifname, iftmpname);
1274 }
1275 }
1276 break;
1277 case PHASE_DISCONNECT:
1278 run_net_script(path_net_down, 0);
1279 break;
1280 default:
1281 break;
1282 }
1283
1284 phase = p;
1285 if (new_phase_hook)
1286 (*new_phase_hook)(p);
1287 notify(phasechange, p);
1288 }
1289
1290 bool
in_phase(ppp_phase_t p)1291 in_phase(ppp_phase_t p)
1292 {
1293 return (phase == p);
1294 }
1295
1296 /*
1297 * die - clean up state and exit with the specified status.
1298 */
1299 void
die(int status)1300 die(int status)
1301 {
1302
1303 if (!mp_on() || mp_master())
1304 print_link_stats();
1305 cleanup();
1306 notify(exitnotify, status);
1307 syslog(LOG_INFO, "Exit.");
1308 exit(status);
1309 }
1310
1311 /*
1312 * cleanup - restore anything which needs to be restored before we exit
1313 */
1314 /* ARGSUSED */
1315 static void
cleanup(void)1316 cleanup(void)
1317 {
1318 sys_cleanup();
1319
1320 if (fd_ppp >= 0)
1321 the_channel->disestablish_ppp(devfd);
1322 if (the_channel->cleanup)
1323 (*the_channel->cleanup)();
1324 remove_pidfiles();
1325
1326 #ifdef PPP_WITH_TDB
1327 if (pppdb != NULL)
1328 cleanup_db();
1329 #endif
1330
1331 }
1332
1333 void
print_link_stats(void)1334 print_link_stats(void)
1335 {
1336 /*
1337 * Print connect time and statistics.
1338 */
1339 if (link_stats_print && link_stats_valid) {
1340 int t = (link_connect_time + 5) / 6; /* 1/10ths of minutes */
1341 info("Connect time %d.%d minutes.", t/10, t%10);
1342 info("Sent %llu bytes, received %llu bytes.",
1343 link_stats.bytes_out, link_stats.bytes_in);
1344 link_stats_print = 0;
1345 }
1346 }
1347
1348 /*
1349 * reset_link_stats - "reset" stats when link goes up.
1350 */
1351 void
reset_link_stats(int u)1352 reset_link_stats(int u)
1353 {
1354 get_ppp_stats(u, &old_link_stats);
1355 ppp_get_time(&start_time);
1356 link_stats_print = 1;
1357 }
1358
1359 /*
1360 * update_link_stats - get stats at link termination.
1361 */
1362 static void
update_link_stats(int u)1363 update_link_stats(int u)
1364 {
1365 struct timeval now;
1366 char numbuf[32];
1367
1368 if (!get_ppp_stats(u, &link_stats)
1369 || ppp_get_time(&now) < 0)
1370 return;
1371 link_connect_time = now.tv_sec - start_time.tv_sec;
1372 link_stats_valid = 1;
1373
1374 link_stats.bytes_in -= old_link_stats.bytes_in;
1375 link_stats.bytes_out -= old_link_stats.bytes_out;
1376 link_stats.pkts_in -= old_link_stats.pkts_in;
1377 link_stats.pkts_out -= old_link_stats.pkts_out;
1378
1379 slprintf(numbuf, sizeof(numbuf), "%u", link_connect_time);
1380 ppp_script_setenv("CONNECT_TIME", numbuf, 0);
1381 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_out);
1382 ppp_script_setenv("BYTES_SENT", numbuf, 0);
1383 snprintf(numbuf, sizeof(numbuf), "%" PRIu64, link_stats.bytes_in);
1384 ppp_script_setenv("BYTES_RCVD", numbuf, 0);
1385 }
1386
1387 bool
ppp_get_link_stats(ppp_link_stats_st * stats)1388 ppp_get_link_stats(ppp_link_stats_st *stats)
1389 {
1390 update_link_stats(0);
1391 if (stats != NULL &&
1392 link_stats_valid) {
1393
1394 memcpy(stats, &link_stats, sizeof(*stats));
1395 return true;
1396 }
1397 return false;
1398 }
1399
1400
1401 struct callout {
1402 struct timeval c_time; /* time at which to call routine */
1403 void *c_arg; /* argument to routine */
1404 void (*c_func)(void *); /* routine */
1405 struct callout *c_next;
1406 };
1407
1408 static struct callout *callout = NULL; /* Callout list */
1409 static struct timeval timenow; /* Current time */
1410
1411 /*
1412 * timeout - Schedule a timeout.
1413 */
1414 void
ppp_timeout(void (* func)(void *),void * arg,int secs,int usecs)1415 ppp_timeout(void (*func)(void *), void *arg, int secs, int usecs)
1416 {
1417 struct callout *newp, *p, **pp;
1418
1419 /*
1420 * Allocate timeout.
1421 */
1422 if ((newp = (struct callout *) malloc(sizeof(struct callout))) == NULL)
1423 fatal("Out of memory in timeout()!");
1424 newp->c_arg = arg;
1425 newp->c_func = func;
1426 ppp_get_time(&timenow);
1427 newp->c_time.tv_sec = timenow.tv_sec + secs;
1428 newp->c_time.tv_usec = timenow.tv_usec + usecs;
1429 if (newp->c_time.tv_usec >= 1000000) {
1430 newp->c_time.tv_sec += newp->c_time.tv_usec / 1000000;
1431 newp->c_time.tv_usec %= 1000000;
1432 }
1433
1434 /*
1435 * Find correct place and link it in.
1436 */
1437 for (pp = &callout; (p = *pp); pp = &p->c_next)
1438 if (newp->c_time.tv_sec < p->c_time.tv_sec
1439 || (newp->c_time.tv_sec == p->c_time.tv_sec
1440 && newp->c_time.tv_usec < p->c_time.tv_usec))
1441 break;
1442 newp->c_next = p;
1443 *pp = newp;
1444 }
1445
1446
1447 /*
1448 * untimeout - Unschedule a timeout.
1449 */
1450 void
ppp_untimeout(void (* func)(void *),void * arg)1451 ppp_untimeout(void (*func)(void *), void *arg)
1452 {
1453 struct callout **copp, *freep;
1454
1455 /*
1456 * Find first matching timeout and remove it from the list.
1457 */
1458 for (copp = &callout; (freep = *copp); copp = &freep->c_next)
1459 if (freep->c_func == func && freep->c_arg == arg) {
1460 *copp = freep->c_next;
1461 free((char *) freep);
1462 break;
1463 }
1464 }
1465
1466
1467 /*
1468 * calltimeout - Call any timeout routines which are now due.
1469 */
1470 static void
calltimeout(void)1471 calltimeout(void)
1472 {
1473 struct callout *p;
1474
1475 while (callout != NULL) {
1476 p = callout;
1477
1478 if (ppp_get_time(&timenow) < 0)
1479 fatal("Failed to get time of day: %m");
1480 if (!(p->c_time.tv_sec < timenow.tv_sec
1481 || (p->c_time.tv_sec == timenow.tv_sec
1482 && p->c_time.tv_usec <= timenow.tv_usec)))
1483 break; /* no, it's not time yet */
1484
1485 callout = p->c_next;
1486 (*p->c_func)(p->c_arg);
1487
1488 free((char *) p);
1489 }
1490 }
1491
1492
1493 /*
1494 * timeleft - return the length of time until the next timeout is due.
1495 */
1496 static struct timeval *
timeleft(struct timeval * tvp)1497 timeleft(struct timeval *tvp)
1498 {
1499 if (callout == NULL)
1500 return NULL;
1501
1502 ppp_get_time(&timenow);
1503 tvp->tv_sec = callout->c_time.tv_sec - timenow.tv_sec;
1504 tvp->tv_usec = callout->c_time.tv_usec - timenow.tv_usec;
1505 if (tvp->tv_usec < 0) {
1506 tvp->tv_usec += 1000000;
1507 tvp->tv_sec -= 1;
1508 }
1509 if (tvp->tv_sec < 0)
1510 tvp->tv_sec = tvp->tv_usec = 0;
1511
1512 return tvp;
1513 }
1514
1515
1516 /*
1517 * kill_my_pg - send a signal to our process group, and ignore it ourselves.
1518 * We assume that sig is currently blocked.
1519 */
1520 static void
kill_my_pg(int sig)1521 kill_my_pg(int sig)
1522 {
1523 struct sigaction act, oldact;
1524 struct subprocess *chp;
1525
1526 if (!detached) {
1527 /*
1528 * There might be other things in our process group that we
1529 * didn't start that would get hit if we did a kill(0), so
1530 * just send the signal individually to our children.
1531 */
1532 for (chp = children; chp != NULL; chp = chp->next)
1533 if (chp->killable)
1534 kill(chp->pid, sig);
1535 return;
1536 }
1537
1538 /* We've done a setsid(), so we can just use a kill(0) */
1539 sigemptyset(&act.sa_mask); /* unnecessary in fact */
1540 act.sa_handler = SIG_IGN;
1541 act.sa_flags = 0;
1542 kill(0, sig);
1543 /*
1544 * The kill() above made the signal pending for us, as well as
1545 * the rest of our process group, but we don't want it delivered
1546 * to us. It is blocked at the moment. Setting it to be ignored
1547 * will cause the pending signal to be discarded. If we did the
1548 * kill() after setting the signal to be ignored, it is unspecified
1549 * (by POSIX) whether the signal is immediately discarded or left
1550 * pending, and in fact Linux would leave it pending, and so it
1551 * would be delivered after the current signal handler exits,
1552 * leading to an infinite loop.
1553 */
1554 sigaction(sig, &act, &oldact);
1555 sigaction(sig, &oldact, NULL);
1556 }
1557
1558
1559 /*
1560 * hup - Catch SIGHUP signal.
1561 *
1562 * Indicates that the physical layer has been disconnected.
1563 * We don't rely on this indication; if the user has sent this
1564 * signal, we just take the link down.
1565 */
1566 static void
hup(int sig)1567 hup(int sig)
1568 {
1569 /* can't log a message here, it can deadlock */
1570 got_sighup = 1;
1571 if (conn_running)
1572 /* Send the signal to the [dis]connector process(es) also */
1573 kill_my_pg(sig);
1574 notify(sigreceived, sig);
1575 if (waiting) {
1576 #pragma GCC diagnostic push
1577 #pragma GCC diagnostic ignored "-Wunused-result"
1578 write(sigpipe[1], &sig, sizeof(sig));
1579 #pragma GCC diagnostic pop
1580 }
1581 }
1582
1583
1584 /*
1585 * term - Catch SIGTERM signal and SIGINT signal (^C/del).
1586 *
1587 * Indicates that we should initiate a graceful disconnect and exit.
1588 */
1589 /*ARGSUSED*/
1590 static void
term(int sig)1591 term(int sig)
1592 {
1593 /* can't log a message here, it can deadlock */
1594 got_sigterm = sig;
1595 if (conn_running)
1596 /* Send the signal to the [dis]connector process(es) also */
1597 kill_my_pg(sig);
1598 notify(sigreceived, sig);
1599 if (waiting) {
1600 #pragma GCC diagnostic push
1601 #pragma GCC diagnostic ignored "-Wunused-result"
1602 write(sigpipe[1], &sig, sizeof(sig));
1603 #pragma GCC diagnostic pop
1604 }
1605 }
1606
1607
1608 /*
1609 * chld - Catch SIGCHLD signal.
1610 * Sets a flag so we will call reap_kids in the mainline.
1611 */
1612 static void
chld(int sig)1613 chld(int sig)
1614 {
1615 got_sigchld = 1;
1616 if (waiting) {
1617 #pragma GCC diagnostic push
1618 #pragma GCC diagnostic ignored "-Wunused-result"
1619 write(sigpipe[1], &sig, sizeof(sig));
1620 #pragma GCC diagnostic pop
1621 }
1622 }
1623
1624
1625 /*
1626 * toggle_debug - Catch SIGUSR1 signal.
1627 *
1628 * Toggle debug flag.
1629 */
1630 /*ARGSUSED*/
1631 static void
toggle_debug(int sig)1632 toggle_debug(int sig)
1633 {
1634 debug = !debug;
1635 if (debug) {
1636 setlogmask(LOG_UPTO(LOG_DEBUG));
1637 } else {
1638 setlogmask(LOG_UPTO(LOG_WARNING));
1639 }
1640 }
1641
1642
1643 /*
1644 * open_ccp - Catch SIGUSR2 signal.
1645 *
1646 * Try to (re)negotiate compression.
1647 */
1648 /*ARGSUSED*/
1649 static void
open_ccp(int sig)1650 open_ccp(int sig)
1651 {
1652 got_sigusr2 = 1;
1653 if (waiting) {
1654 #pragma GCC diagnostic push
1655 #pragma GCC diagnostic ignored "-Wunused-result"
1656 write(sigpipe[1], &sig, sizeof(sig));
1657 #pragma GCC diagnostic pop
1658 }
1659 }
1660
1661
1662 /*
1663 * bad_signal - We've caught a fatal signal. Clean up state and exit.
1664 */
1665 static void
bad_signal(int sig)1666 bad_signal(int sig)
1667 {
1668 static int crashed = 0;
1669
1670 if (crashed)
1671 _exit(127);
1672 crashed = 1;
1673 error("Fatal signal %d", sig);
1674 if (conn_running)
1675 kill_my_pg(SIGTERM);
1676 notify(sigreceived, sig);
1677 die(127);
1678 }
1679
1680 /*
1681 * ppp_safe_fork - Create a child process. The child closes all the
1682 * file descriptors that we don't want to leak to a script.
1683 * The parent waits for the child to do this before returning.
1684 * This also arranges for the specified fds to be dup'd to
1685 * fds 0, 1, 2 in the child.
1686 */
1687 pid_t
ppp_safe_fork(int infd,int outfd,int errfd)1688 ppp_safe_fork(int infd, int outfd, int errfd)
1689 {
1690 pid_t pid;
1691 int fd, pipefd[2];
1692 char buf[1];
1693
1694 /* make sure fds 0, 1, 2 are occupied (probably not necessary) */
1695 while ((fd = dup(fd_devnull)) >= 0) {
1696 if (fd > 2) {
1697 close(fd);
1698 break;
1699 }
1700 }
1701
1702 if (pipe(pipefd) == -1)
1703 pipefd[0] = pipefd[1] = -1;
1704 pid = fork();
1705 if (pid < 0) {
1706 error("fork failed: %m");
1707 return -1;
1708 }
1709 if (pid > 0) {
1710 /* parent */
1711 close(pipefd[1]);
1712 /* this read() blocks until the close(pipefd[1]) below */
1713 complete_read(pipefd[0], buf, 1);
1714 close(pipefd[0]);
1715 return pid;
1716 }
1717
1718 /* Executing in the child */
1719 ppp_sys_close();
1720 #ifdef PPP_WITH_TDB
1721 if (pppdb != NULL)
1722 tdb_close(pppdb);
1723 #endif
1724
1725 /* make sure infd, outfd and errfd won't get tromped on below */
1726 if (infd == 1 || infd == 2)
1727 infd = dup(infd);
1728 if (outfd == 0 || outfd == 2)
1729 outfd = dup(outfd);
1730 if (errfd == 0 || errfd == 1)
1731 errfd = dup(errfd);
1732
1733 closelog();
1734
1735 /* dup the in, out, err fds to 0, 1, 2 */
1736 if (infd != 0)
1737 dup2(infd, 0);
1738 if (outfd != 1)
1739 dup2(outfd, 1);
1740 if (errfd != 2)
1741 dup2(errfd, 2);
1742
1743 if (log_to_fd > 2)
1744 close(log_to_fd);
1745 if (the_channel->close)
1746 (*the_channel->close)();
1747 else
1748 close(devfd); /* some plugins don't have a close function */
1749 close(fd_ppp);
1750 close(fd_devnull);
1751 if (infd != 0)
1752 close(infd);
1753 if (outfd != 1)
1754 close(outfd);
1755 if (errfd != 2)
1756 close(errfd);
1757
1758 notify(fork_notifier, 0);
1759 close(pipefd[0]);
1760 /* this close unblocks the read() call above in the parent */
1761 close(pipefd[1]);
1762
1763 return 0;
1764 }
1765
1766 static bool
add_script_env(int pos,char * newstring)1767 add_script_env(int pos, char *newstring)
1768 {
1769 if (pos + 1 >= s_env_nalloc) {
1770 int new_n = pos + 17;
1771 char **newenv = realloc(script_env, new_n * sizeof(char *));
1772 if (newenv == NULL) {
1773 free(newstring - 1);
1774 return 0;
1775 }
1776 script_env = newenv;
1777 s_env_nalloc = new_n;
1778 }
1779 script_env[pos] = newstring;
1780 script_env[pos + 1] = NULL;
1781 return 1;
1782 }
1783
1784 static void
remove_script_env(int pos)1785 remove_script_env(int pos)
1786 {
1787 free(script_env[pos] - 1);
1788 while ((script_env[pos] = script_env[pos + 1]) != NULL)
1789 pos++;
1790 }
1791
1792 /*
1793 * update_system_environment - process the list of set/unset options
1794 * and update the system environment.
1795 */
1796 static void
update_system_environment(void)1797 update_system_environment(void)
1798 {
1799 struct userenv *uep;
1800
1801 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1802 if (uep->ue_isset)
1803 setenv(uep->ue_name, uep->ue_value, 1);
1804 else
1805 unsetenv(uep->ue_name);
1806 }
1807 }
1808
1809 /*
1810 * device_script - run a program to talk to the specified fds
1811 * (e.g. to run the connector or disconnector script).
1812 * stderr gets connected to the log fd or to the PPP_PATH_CONNERRS file.
1813 */
1814 int
device_script(char * program,int in,int out,int dont_wait)1815 device_script(char *program, int in, int out, int dont_wait)
1816 {
1817 int pid;
1818 int status = -1;
1819 int errfd;
1820 int ret;
1821
1822 if (log_to_fd >= 0)
1823 errfd = log_to_fd;
1824 else {
1825 errfd = open(PPP_PATH_CONNERRS, O_WRONLY | O_APPEND | O_CREAT, 0600);
1826 if (errfd == -1) {
1827 error("Cannot open `%s': %m", PPP_PATH_CONNERRS);
1828 return -1;
1829 }
1830 }
1831
1832 ++conn_running;
1833 pid = ppp_safe_fork(in, out, errfd);
1834
1835 if (pid != 0 && log_to_fd < 0)
1836 close(errfd);
1837
1838 if (pid < 0) {
1839 --conn_running;
1840 error("Failed to create child process: %m");
1841 return -1;
1842 }
1843
1844 if (pid != 0) {
1845 record_child(pid, program, NULL, NULL, 1);
1846 status = 0;
1847 if (!dont_wait) {
1848 while (waitpid(pid, &status, 0) < 0) {
1849 if (errno == EINTR)
1850 continue;
1851 fatal("error waiting for (dis)connection process: %m");
1852 }
1853 forget_child(pid, status);
1854 --conn_running;
1855 }
1856 return (status == 0 ? 0 : -1);
1857 }
1858
1859 /* here we are executing in the child */
1860 ret = setgid(getgid());
1861 if (ret != 0) {
1862 perror("pppd: setgid failed\n");
1863 exit(1);
1864 }
1865 ret = setuid(uid);
1866 if (ret != 0 || getuid() != uid) {
1867 perror("pppd: setuid failed\n");
1868 exit(1);
1869 }
1870 update_system_environment();
1871 execl("/bin/sh", "sh", "-c", program, (char *)0);
1872 perror("pppd: could not exec /bin/sh");
1873 _exit(99);
1874 /* NOTREACHED */
1875 }
1876
1877
1878 /*
1879 * update_script_environment - process the list of set/unset options
1880 * and update the script environment. Note that we intentionally do
1881 * not update the TDB. These changes are layered on top right before
1882 * exec. It is not possible to use script_setenv() or
1883 * ppp_script_unsetenv() safely after this routine is run.
1884 */
1885 static void
update_script_environment(void)1886 update_script_environment(void)
1887 {
1888 struct userenv *uep;
1889
1890 for (uep = userenv_list; uep != NULL; uep = uep->ue_next) {
1891 int i;
1892 char *p, *newstring;
1893 int nlen = strlen(uep->ue_name);
1894
1895 for (i = 0; (p = script_env[i]) != NULL; i++) {
1896 if (strncmp(p, uep->ue_name, nlen) == 0 && p[nlen] == '=')
1897 break;
1898 }
1899 if (uep->ue_isset) {
1900 nlen += strlen(uep->ue_value) + 2;
1901 newstring = malloc(nlen + 1);
1902 if (newstring == NULL)
1903 continue;
1904 *newstring++ = 0;
1905 slprintf(newstring, nlen, "%s=%s", uep->ue_name, uep->ue_value);
1906 if (p != NULL)
1907 script_env[i] = newstring;
1908 else
1909 add_script_env(i, newstring);
1910 } else if (p != NULL) {
1911 remove_script_env(i);
1912 }
1913 }
1914 }
1915
1916 /*
1917 * run_program - execute a program with given arguments,
1918 * but don't wait for it unless wait is non-zero.
1919 * If the program can't be executed, logs an error unless
1920 * must_exist is 0 and the program file doesn't exist.
1921 * Returns -1 if it couldn't fork, 0 if the file doesn't exist
1922 * or isn't an executable plain file, or the process ID of the child.
1923 * If done != NULL, (*done)(arg) will be called later (within
1924 * reap_kids) iff the return value is > 0.
1925 */
1926 pid_t
run_program(char * prog,char * const * args,int must_exist,void (* done)(void *),void * arg,int wait)1927 run_program(char *prog, char * const *args, int must_exist, void (*done)(void *), void *arg, int wait)
1928 {
1929 int pid, status, ret;
1930 struct stat sbuf;
1931
1932 /*
1933 * First check if the file exists and is executable.
1934 * We don't use access() because that would use the
1935 * real user-id, which might not be root, and the script
1936 * might be accessible only to root.
1937 */
1938 errno = EINVAL;
1939 if (stat(prog, &sbuf) < 0 || !S_ISREG(sbuf.st_mode)
1940 || (sbuf.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0) {
1941 if (must_exist || errno != ENOENT)
1942 warn("Can't execute %s: %m", prog);
1943 return 0;
1944 }
1945
1946 pid = ppp_safe_fork(fd_devnull, fd_devnull, fd_devnull);
1947 if (pid == -1) {
1948 error("Failed to create child process for %s: %m", prog);
1949 return -1;
1950 }
1951 if (pid != 0) {
1952 if (debug)
1953 dbglog("Script %s started (pid %d)", prog, pid);
1954 record_child(pid, prog, done, arg, 0);
1955 if (wait) {
1956 while (waitpid(pid, &status, 0) < 0) {
1957 if (errno == EINTR)
1958 continue;
1959 fatal("error waiting for script %s: %m", prog);
1960 }
1961 forget_child(pid, status);
1962 }
1963 return pid;
1964 }
1965
1966 /* Leave the current location */
1967 (void) setsid(); /* No controlling tty. */
1968 (void) umask (S_IRWXG|S_IRWXO);
1969 ret = chdir ("/"); /* no current directory. */
1970 if (ret != 0) {
1971 fatal("Failed to change directory to '/', %m");
1972 }
1973 ret = setuid(0); /* set real UID = root */
1974 if (ret != 0) {
1975 fatal("Failed to set uid, %m");
1976 }
1977 ret = setgid(getegid());
1978 if (ret != 0) {
1979 fatal("failed to set gid, %m");
1980 }
1981
1982 #ifdef BSD
1983 /* Force the priority back to zero if pppd is running higher. */
1984 if (setpriority (PRIO_PROCESS, 0, 0) < 0)
1985 warn("can't reset priority to 0: %m");
1986 #endif
1987
1988 /* run the program */
1989 update_script_environment();
1990 execve(prog, args, script_env);
1991 if (must_exist || errno != ENOENT) {
1992 /* have to reopen the log, there's nowhere else
1993 for the message to go. */
1994 reopen_log();
1995 syslog(LOG_ERR, "Can't execute %s: %m", prog);
1996 closelog();
1997 }
1998 _exit(99);
1999 }
2000
2001
2002 /*
2003 * record_child - add a child process to the list for reap_kids
2004 * to use.
2005 */
2006 void
record_child(int pid,char * prog,void (* done)(void *),void * arg,int killable)2007 record_child(int pid, char *prog, void (*done)(void *), void *arg, int killable)
2008 {
2009 struct subprocess *chp;
2010
2011 ++n_children;
2012
2013 chp = (struct subprocess *) malloc(sizeof(struct subprocess));
2014 if (chp == NULL) {
2015 warn("losing track of %s process", prog);
2016 } else {
2017 chp->pid = pid;
2018 chp->prog = prog;
2019 chp->done = done;
2020 chp->arg = arg;
2021 chp->next = children;
2022 chp->killable = killable;
2023 children = chp;
2024 }
2025 }
2026
2027 /*
2028 * childwait_end - we got fed up waiting for the child processes to
2029 * exit, send them all a SIGTERM.
2030 */
2031 static void
childwait_end(void * arg)2032 childwait_end(void *arg)
2033 {
2034 struct subprocess *chp;
2035
2036 for (chp = children; chp != NULL; chp = chp->next) {
2037 if (debug)
2038 dbglog("sending SIGTERM to process %d", chp->pid);
2039 kill(chp->pid, SIGTERM);
2040 }
2041 childwait_done = 1;
2042 }
2043
2044 /*
2045 * forget_child - clean up after a dead child
2046 */
2047 static void
forget_child(int pid,int status)2048 forget_child(int pid, int status)
2049 {
2050 struct subprocess *chp, **prevp;
2051
2052 for (prevp = &children; (chp = *prevp) != NULL; prevp = &chp->next) {
2053 if (chp->pid == pid) {
2054 --n_children;
2055 *prevp = chp->next;
2056 break;
2057 }
2058 }
2059 if (WIFSIGNALED(status)) {
2060 warn("Child process %s (pid %d) terminated with signal %d",
2061 (chp? chp->prog: "??"), pid, WTERMSIG(status));
2062 } else if (debug)
2063 dbglog("Script %s finished (pid %d), status = 0x%x",
2064 (chp? chp->prog: "??"), pid,
2065 WIFEXITED(status) ? WEXITSTATUS(status) : status);
2066 if (chp && chp->done)
2067 (*chp->done)(chp->arg);
2068 if (chp)
2069 free(chp);
2070 }
2071
2072 /*
2073 * reap_kids - get status from any dead child processes,
2074 * and log a message for abnormal terminations.
2075 */
2076 static int
reap_kids(void)2077 reap_kids(void)
2078 {
2079 int pid, status;
2080
2081 if (n_children == 0)
2082 return 0;
2083 while ((pid = waitpid(-1, &status, WNOHANG)) != -1 && pid != 0) {
2084 forget_child(pid, status);
2085 }
2086 if (pid == -1) {
2087 if (errno == ECHILD)
2088 return -1;
2089 if (errno != EINTR)
2090 error("Error waiting for child process: %m");
2091 }
2092 return 0;
2093 }
2094
2095
get_notifier_by_type(ppp_notify_t type)2096 static struct notifier **get_notifier_by_type(ppp_notify_t type)
2097 {
2098 struct notifier **list[NF_MAX_NOTIFY] = {
2099 [NF_PID_CHANGE ] = &pidchange,
2100 [NF_PHASE_CHANGE] = &phasechange,
2101 [NF_EXIT ] = &exitnotify,
2102 [NF_SIGNALED ] = &sigreceived,
2103 [NF_IP_UP ] = &ip_up_notifier,
2104 [NF_IP_DOWN ] = &ip_down_notifier,
2105 #ifdef PPP_WITH_IPV6CP
2106 [NF_IPV6_UP ] = &ipv6_up_notifier,
2107 [NF_IPV6_DOWN ] = &ipv6_down_notifier,
2108 #endif
2109 [NF_AUTH_UP ] = &auth_up_notifier,
2110 [NF_LINK_DOWN ] = &link_down_notifier,
2111 [NF_FORK ] = &fork_notifier,
2112 };
2113 return list[type];
2114 }
2115
2116 /*
2117 * add_notifier - add a new function to be called when something happens.
2118 */
2119 void
ppp_add_notify(ppp_notify_t type,ppp_notify_fn * func,void * arg)2120 ppp_add_notify(ppp_notify_t type, ppp_notify_fn *func, void *arg)
2121 {
2122 struct notifier **notif = get_notifier_by_type(type);
2123 if (notif) {
2124
2125 struct notifier *np = malloc(sizeof(struct notifier));
2126 if (np == 0)
2127 novm("notifier struct");
2128 np->next = *notif;
2129 np->func = func;
2130 np->arg = arg;
2131 *notif = np;
2132 } else {
2133 error("Could not find notifier function for: %d", type);
2134 }
2135 }
2136
2137 /*
2138 * remove_notifier - remove a function from the list of things to
2139 * be called when something happens.
2140 */
2141 void
ppp_del_notify(ppp_notify_t type,ppp_notify_fn * func,void * arg)2142 ppp_del_notify(ppp_notify_t type, ppp_notify_fn *func, void *arg)
2143 {
2144 struct notifier **notif = get_notifier_by_type(type);
2145 if (notif) {
2146 struct notifier *np;
2147
2148 for (; (np = *notif) != 0; notif = &np->next) {
2149 if (np->func == func && np->arg == arg) {
2150 *notif = np->next;
2151 free(np);
2152 break;
2153 }
2154 }
2155 } else {
2156 error("Could not find notifier function for: %d", type);
2157 }
2158 }
2159
2160 /*
2161 * notify - call a set of functions registered with add_notifier.
2162 */
2163 void
notify(struct notifier * notif,int val)2164 notify(struct notifier *notif, int val)
2165 {
2166 struct notifier *np;
2167
2168 while ((np = notif) != 0) {
2169 notif = np->next;
2170 (*np->func)(np->arg, val);
2171 }
2172 }
2173
2174 /*
2175 * novm - log an error message saying we ran out of memory, and die.
2176 */
2177 void
novm(const char * msg)2178 novm(const char *msg)
2179 {
2180 fatal("Virtual memory exhausted allocating %s\n", msg);
2181 }
2182
2183 /*
2184 * ppp_script_setenv - set an environment variable value to be used
2185 * for scripts that we run (e.g. ip-up, auth-up, etc.)
2186 */
2187 void
ppp_script_setenv(char * var,char * value,int iskey)2188 ppp_script_setenv(char *var, char *value, int iskey)
2189 {
2190 size_t varl = strlen(var);
2191 size_t vl = varl + strlen(value) + 2;
2192 int i;
2193 char *p, *newstring;
2194
2195 newstring = (char *) malloc(vl+1);
2196 if (newstring == 0)
2197 return;
2198 *newstring++ = iskey;
2199 slprintf(newstring, vl, "%s=%s", var, value);
2200
2201 /* check if this variable is already set */
2202 if (script_env != 0) {
2203 for (i = 0; (p = script_env[i]) != 0; ++i) {
2204 if (strncmp(p, var, varl) == 0 && p[varl] == '=') {
2205 #ifdef PPP_WITH_TDB
2206 if (p[-1] && pppdb != NULL)
2207 delete_db_key(p);
2208 #endif
2209 free(p-1);
2210 script_env[i] = newstring;
2211 #ifdef PPP_WITH_TDB
2212 if (pppdb != NULL) {
2213 if (iskey)
2214 add_db_key(newstring);
2215 update_db_entry();
2216 }
2217 #endif
2218 return;
2219 }
2220 }
2221 } else {
2222 /* no space allocated for script env. ptrs. yet */
2223 i = 0;
2224 script_env = malloc(16 * sizeof(char *));
2225 if (script_env == 0) {
2226 free(newstring - 1);
2227 return;
2228 }
2229 s_env_nalloc = 16;
2230 }
2231
2232 if (!add_script_env(i, newstring))
2233 return;
2234
2235 #ifdef PPP_WITH_TDB
2236 if (pppdb != NULL) {
2237 if (iskey)
2238 add_db_key(newstring);
2239 update_db_entry();
2240 }
2241 #endif
2242 }
2243
2244 /*
2245 * ppp_script_unsetenv - remove a variable from the environment
2246 * for scripts.
2247 */
2248 void
ppp_script_unsetenv(char * var)2249 ppp_script_unsetenv(char *var)
2250 {
2251 int vl = strlen(var);
2252 int i;
2253 char *p;
2254
2255 if (script_env == 0)
2256 return;
2257 for (i = 0; (p = script_env[i]) != 0; ++i) {
2258 if (strncmp(p, var, vl) == 0 && p[vl] == '=') {
2259 #ifdef PPP_WITH_TDB
2260 if (p[-1] && pppdb != NULL)
2261 delete_db_key(p);
2262 #endif
2263 remove_script_env(i);
2264 break;
2265 }
2266 }
2267 #ifdef PPP_WITH_TDB
2268 if (pppdb != NULL)
2269 update_db_entry();
2270 #endif
2271 }
2272
2273 /*
2274 * Any arbitrary string used as a key for locking the database.
2275 * It doesn't matter what it is as long as all pppds use the same string.
2276 */
2277 #define PPPD_LOCK_KEY "pppd lock"
2278
2279 /*
2280 * lock_db - get an exclusive lock on the TDB database.
2281 * Used to ensure atomicity of various lookup/modify operations.
2282 */
lock_db(void)2283 void lock_db(void)
2284 {
2285 #ifdef PPP_WITH_TDB
2286 TDB_DATA key;
2287
2288 key.dptr = PPPD_LOCK_KEY;
2289 key.dsize = strlen(key.dptr);
2290 tdb_chainlock(pppdb, key);
2291 #endif
2292 }
2293
2294 /*
2295 * unlock_db - remove the exclusive lock obtained by lock_db.
2296 */
unlock_db(void)2297 void unlock_db(void)
2298 {
2299 #ifdef PPP_WITH_TDB
2300 TDB_DATA key;
2301
2302 key.dptr = PPPD_LOCK_KEY;
2303 key.dsize = strlen(key.dptr);
2304 tdb_chainunlock(pppdb, key);
2305 #endif
2306 }
2307
2308 #ifdef PPP_WITH_TDB
2309 /*
2310 * update_db_entry - update our entry in the database.
2311 */
2312 static void
update_db_entry(void)2313 update_db_entry(void)
2314 {
2315 TDB_DATA key, dbuf;
2316 int vlen, i;
2317 char *p, *q, *vbuf;
2318
2319 if (script_env == NULL)
2320 return;
2321 vlen = 0;
2322 for (i = 0; (p = script_env[i]) != 0; ++i)
2323 vlen += strlen(p) + 1;
2324 vbuf = malloc(vlen + 1);
2325 if (vbuf == 0)
2326 novm("database entry");
2327 q = vbuf;
2328 for (i = 0; (p = script_env[i]) != 0; ++i)
2329 q += slprintf(q, vbuf + vlen - q, "%s;", p);
2330
2331 key.dptr = db_key;
2332 key.dsize = strlen(db_key);
2333 dbuf.dptr = vbuf;
2334 dbuf.dsize = vlen;
2335 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2336 error("tdb_store failed: %s", tdb_errorstr(pppdb));
2337
2338 if (vbuf)
2339 free(vbuf);
2340
2341 }
2342
2343 /*
2344 * add_db_key - add a key that we can use to look up our database entry.
2345 */
2346 static void
add_db_key(const char * str)2347 add_db_key(const char *str)
2348 {
2349 TDB_DATA key, dbuf;
2350
2351 key.dptr = (char *) str;
2352 key.dsize = strlen(str);
2353 dbuf.dptr = db_key;
2354 dbuf.dsize = strlen(db_key);
2355 if (tdb_store(pppdb, key, dbuf, TDB_REPLACE))
2356 error("tdb_store key failed: %s", tdb_errorstr(pppdb));
2357 }
2358
2359 /*
2360 * delete_db_key - delete a key for looking up our database entry.
2361 */
2362 static void
delete_db_key(const char * str)2363 delete_db_key(const char *str)
2364 {
2365 TDB_DATA key;
2366
2367 key.dptr = (char *) str;
2368 key.dsize = strlen(str);
2369 tdb_delete(pppdb, key);
2370 }
2371
2372 /*
2373 * cleanup_db - delete all the entries we put in the database.
2374 */
2375 static void
cleanup_db(void)2376 cleanup_db(void)
2377 {
2378 TDB_DATA key;
2379 int i;
2380 char *p;
2381
2382 key.dptr = db_key;
2383 key.dsize = strlen(db_key);
2384 tdb_delete(pppdb, key);
2385 for (i = 0; (p = script_env[i]) != 0; ++i)
2386 if (p[-1])
2387 delete_db_key(p);
2388 }
2389 #endif /* PPP_WITH_TDB */
2390