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458f14b7 AM |
1 | /* |
2 | * ppp-watch.c | |
3 | * | |
4 | * Bring up a PPP connection and Do The Right Thing[tm] to make bringing | |
5 | * the connection up or down with ifup and ifdown syncronous. Takes | |
6 | * one argument: the logical name of the device to bring up. Does not | |
7 | * detach until the interface is up or has permanently failed to come up. | |
8 | * | |
9 | * Copyright 1999 Red Hat, Inc. | |
10 | * | |
11 | * This is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by | |
13 | * the Free Software Foundation; either version 2 of the License, or | |
14 | * (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, but | |
17 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | * General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
24 | * | |
25 | */ | |
26 | ||
27 | /* Algorithm: | |
28 | * fork | |
29 | * if child: | |
30 | * Register with netreport. (now exit implies deregister first) | |
31 | * fork/exec ifup-ppp daemon <interface> | |
32 | * else: | |
33 | * while (1): | |
34 | * sigsuspend() | |
35 | * if SIGTERM or SIGINT: | |
36 | * kill pppd pgrp | |
37 | * exit | |
38 | * if SIGHUP: | |
39 | * reload ifcfg files | |
40 | * kill pppd pgrp | |
41 | * wait for SIGCHLD to redial | |
42 | * if SIGIO: | |
43 | * if no physical device found: continue | |
44 | * elif physical device is down: | |
45 | * wait for pppd to exit to redial if appropriate | |
46 | * else: (physical device is up) | |
47 | * detach; continue | |
48 | * if SIGCHLD: (pppd exited) | |
49 | * wait() | |
50 | * if pppd exited: | |
51 | * if PERSIST: redial | |
52 | * else: exit | |
53 | * else: (pppd was killed) | |
54 | * exit | |
55 | * | |
56 | * | |
57 | * When ppp-watch itself dies for reasons of its own, it uses a return code | |
58 | * higher than 25 so as not to clash with pppd return codes, which, as of | |
59 | * this writing, range from 0 to 19. | |
60 | */ | |
61 | ||
62 | #include <unistd.h> | |
63 | #include <errno.h> | |
64 | #include <fcntl.h> | |
65 | #include <signal.h> | |
66 | #include <string.h> | |
67 | #include <stdio.h> | |
68 | #include <stdlib.h> | |
69 | #include <sys/ioctl.h> | |
70 | #include <sys/time.h> | |
71 | #include <sys/types.h> | |
72 | #include <sys/resource.h> | |
73 | #include <sys/socket.h> | |
74 | #include <sys/stat.h> | |
75 | #include <sys/wait.h> | |
76 | #include <termios.h> | |
77 | #include <net/if.h> | |
78 | ||
79 | #include "shvar.h" | |
80 | ||
81 | static int theSigterm = 0; | |
82 | static int theSigint = 0; | |
83 | static int theSighup = 0; | |
84 | static int theSigio = 0; | |
85 | static int theSigchld = 0; | |
86 | static int theSigalrm = 0; | |
87 | ||
88 | static int theChild; | |
89 | ||
90 | ||
91 | static void | |
92 | cleanExit(int exitCode); | |
93 | ||
94 | ||
95 | ||
96 | static void | |
97 | forward_signal(int signo) { | |
98 | kill(theChild, SIGINT); | |
99 | } | |
100 | ||
101 | ||
102 | ||
103 | ||
104 | static void | |
105 | set_signal(int signo, void (*handler)(int)) { | |
106 | struct sigaction act; | |
107 | ||
108 | act.sa_handler = handler; | |
109 | act.sa_flags = SA_RESTART; | |
110 | sigemptyset(&act.sa_mask); | |
111 | sigaction(signo, &act, NULL); | |
112 | } | |
113 | ||
114 | ||
115 | ||
116 | static void | |
117 | detach(int now, int parentExitCode, char *device) { | |
118 | static int pipeArray[2]; | |
119 | char exitCode; | |
120 | ||
121 | if (now) { | |
122 | /* execute -- ignore errors in case called more than once */ | |
123 | exitCode = parentExitCode; | |
124 | write(pipeArray[1], &exitCode, 1); | |
125 | close(pipeArray[1]); | |
126 | ||
127 | } else { | |
128 | /* set up */ | |
129 | int child; | |
130 | ||
131 | if (pipe(pipeArray)) exit (25); | |
132 | ||
133 | child = fork(); | |
134 | if (child < 0) exit(26); | |
135 | if (child) { | |
136 | /* parent process */ | |
137 | close (pipeArray[1]); | |
138 | ||
139 | /* forward likely signals to the main process; we will | |
140 | * react later | |
141 | */ | |
142 | theChild = child; | |
143 | set_signal(SIGINT, forward_signal); | |
144 | set_signal(SIGTERM, forward_signal); | |
145 | set_signal(SIGHUP, forward_signal); | |
146 | ||
147 | while (read (pipeArray[0], &exitCode, 1) < 0) { | |
148 | switch (errno) { | |
149 | case EINTR: continue; | |
150 | default: exit (27); /* this will catch EIO in particular */ | |
151 | } | |
152 | } | |
153 | switch (exitCode) { | |
154 | case 0: | |
155 | break; | |
156 | case 33: | |
157 | fprintf(stderr, "%s already up, initiating redial\n", device); | |
158 | break; | |
159 | case 34: | |
160 | fprintf(stderr, "Failed to activate %s, retrying in the background\n", device); | |
161 | break; | |
162 | default: | |
163 | fprintf(stderr, "Failed to activate %s with error %d\n", device, exitCode); | |
164 | break; | |
165 | } | |
166 | exit(exitCode); | |
167 | ||
168 | } else { | |
169 | /* child process */ | |
170 | close (pipeArray[0]); | |
171 | /* become a daemon */ | |
172 | close (0); | |
173 | close (1); | |
174 | close (2); | |
175 | setsid(); | |
176 | setpgid(0, 0); | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | ||
182 | ||
183 | static void | |
184 | doPidFile(char *device) { | |
185 | static char *pidFileName = NULL; | |
186 | char *pidFilePath; | |
187 | int fd; FILE *f; | |
188 | pid_t pid = 0; | |
189 | ||
190 | if (pidFileName) { | |
191 | /* remove it */ | |
192 | pidFilePath = alloca(strlen(pidFileName) + 25); | |
193 | sprintf(pidFilePath, "/var/run/pppwatch-%s.pid", pidFileName); | |
194 | unlink(pidFilePath); /* not much we can do in case of error... */ | |
195 | } | |
196 | ||
197 | if (device) { | |
198 | /* create it */ | |
199 | pidFileName = device; | |
200 | pidFilePath = alloca(strlen(pidFileName) + 25); | |
201 | sprintf(pidFilePath, "/var/run/pppwatch-%s.pid", pidFileName); | |
202 | restart: | |
203 | fd = open(pidFilePath, O_WRONLY|O_TRUNC|O_CREAT|O_EXCL, | |
204 | S_IRUSR|S_IWUSR | S_IRGRP | S_IROTH); | |
205 | ||
206 | if (fd == -1) { | |
207 | /* file already existed, or terrible things have happened... */ | |
208 | fd = open(pidFilePath, O_RDONLY); | |
209 | if (fd == -1) | |
210 | cleanExit(36); /* terrible things have happened */ | |
211 | /* already running, send a SIGHUP (we presume that they | |
212 | * are calling ifup for a reason, so they probably want | |
213 | * to redial) and then exit cleanly and let things go | |
214 | * on in the background | |
215 | */ | |
216 | f = fdopen(fd, "r"); | |
217 | if (!f) cleanExit(37); | |
218 | fscanf(f, "%d", &pid); | |
219 | fclose(f); | |
220 | if (pid) { | |
221 | if (kill(pid, SIGHUP)) { | |
222 | unlink(pidFilePath); | |
223 | goto restart; | |
224 | } else { | |
225 | cleanExit(33); | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
230 | f = fdopen(fd, "w"); | |
231 | if (!f) | |
232 | cleanExit(31); | |
233 | fprintf(f, "%d\n", getpid()); | |
234 | fclose(f); | |
235 | } | |
236 | } | |
237 | ||
238 | ||
239 | ||
240 | ||
241 | ||
242 | int | |
243 | fork_exec(int wait, char *path, char *arg1, char *arg2, char *arg3) | |
244 | { | |
245 | pid_t child; | |
246 | int status; | |
247 | ||
248 | sigset_t sigs; | |
249 | ||
250 | if (!(child = fork())) { | |
251 | /* child */ | |
252 | ||
253 | /* don't leave signals blocked for pppd */ | |
254 | sigemptyset(&sigs); | |
255 | sigprocmask(SIG_SETMASK, &sigs, NULL); | |
256 | ||
257 | if (!wait) { | |
258 | /* make sure that pppd is in its own process group */ | |
259 | setsid(); | |
260 | setpgid(0, 0); | |
261 | } | |
262 | ||
263 | execl(path, path, arg1, arg2, arg3, NULL); | |
264 | perror(path); | |
265 | _exit (1); | |
266 | } | |
267 | ||
268 | if (wait) { | |
269 | wait4 (child, &status, 0, NULL); | |
270 | if (WIFEXITED(status) && (WEXITSTATUS(status) == 0)) { | |
271 | return 0; | |
272 | } else { | |
273 | return 1; | |
274 | } | |
275 | } else { | |
276 | return 0; | |
277 | } | |
278 | } | |
279 | ||
280 | ||
281 | ||
282 | static void | |
283 | cleanExit(int exitCode) { | |
284 | fork_exec(1, "/sbin/netreport", "-r", NULL, NULL); | |
285 | detach(1, exitCode, NULL); | |
286 | doPidFile(NULL); | |
287 | exit(exitCode); | |
288 | } | |
289 | ||
290 | ||
291 | ||
292 | static void | |
293 | signal_handler (int signum) { | |
294 | switch(signum) { | |
295 | case SIGTERM: | |
296 | theSigterm = 1; break; | |
297 | case SIGINT: | |
298 | theSigint = 1; break; | |
299 | case SIGHUP: | |
300 | theSighup = 1; break; | |
301 | case SIGIO: | |
302 | theSigio = 1; break; | |
303 | case SIGCHLD: | |
304 | theSigchld = 1; break; | |
305 | case SIGALRM: | |
306 | theSigalrm = 1; break; | |
307 | } | |
308 | } | |
309 | ||
310 | ||
311 | static shvarFile * | |
312 | shvarfilesGet(char *interfaceName) { | |
313 | shvarFile *ifcfg; | |
314 | char *ifcfgName, *ifcfgParentName, *ifcfgParentDiff; | |
315 | static char ifcfgPrefix[] = "/etc/sysconfig/network-scripts/ifcfg-"; | |
316 | ||
317 | ifcfgName = alloca(sizeof(ifcfgPrefix)+strlen(interfaceName)+1); | |
318 | sprintf(ifcfgName, "%s%s", ifcfgPrefix, interfaceName); | |
319 | ifcfg = svNewFile(ifcfgName); | |
320 | if (!ifcfg) return NULL; | |
321 | ||
322 | /* Do we have a parent interface to inherit? */ | |
323 | ifcfgParentDiff = strchr(interfaceName, '-'); | |
324 | if (ifcfgParentDiff) { | |
325 | /* allocate more than enough memory... */ | |
326 | ifcfgParentName = alloca(sizeof(ifcfgPrefix)+strlen(interfaceName)+1); | |
327 | strcpy(ifcfgParentName, ifcfgPrefix); | |
328 | strncat(ifcfgParentName, interfaceName, ifcfgParentDiff-interfaceName); | |
329 | ifcfg->parent = svNewFile(ifcfgParentName); | |
330 | } | |
331 | ||
332 | /* don't keep the file descriptors around, they can become | |
333 | * stdout for children | |
334 | */ | |
335 | close (ifcfg->fd); ifcfg->fd = 0; | |
336 | if (ifcfg->parent) { | |
337 | close (ifcfg->parent->fd); ifcfg->parent->fd = 0; | |
338 | } | |
339 | ||
340 | return ifcfg; | |
341 | } | |
342 | ||
343 | ||
344 | ||
345 | static char * | |
346 | pppLogicalToPhysical(int *pppdPid, char *logicalName) { | |
347 | char *mapFileName; | |
348 | char buffer[20]; /* more than enough space for ppp<n> */ | |
349 | char *p, *q; | |
350 | int f, n; | |
351 | char *physicalDevice = NULL; | |
352 | ||
353 | mapFileName = alloca (strlen(logicalName)+20); | |
354 | sprintf(mapFileName, "/var/run/ppp-%s.pid", logicalName); | |
355 | if ((f = open(mapFileName, O_RDONLY)) >= 0) { | |
356 | n = read(f, buffer, 20); | |
357 | if (n > 0) { | |
358 | buffer[n] = '\0'; | |
359 | /* get past pid */ | |
360 | p = buffer; while (*p && *p != '\n') p++; *p = '\0'; p++; | |
361 | if (pppdPid) *pppdPid = atoi(buffer); | |
362 | /* get rid of \n */ | |
363 | q = p; while (*q && *q != '\n' && q < buffer+n) q++; *q = '\0'; | |
364 | if (*p) physicalDevice = strdup(p); | |
365 | } | |
366 | close(f); | |
367 | } | |
368 | ||
369 | return physicalDevice; | |
370 | } | |
371 | ||
372 | ||
373 | static int | |
374 | interfaceStatus(char *device) { | |
375 | int sock = 0; | |
376 | int pfs[] = {AF_INET, AF_IPX, AF_AX25, AF_APPLETALK, 0}; | |
377 | int p = 0; | |
378 | struct ifreq ifr; | |
379 | int retcode = 0; | |
380 | ||
381 | while (!sock && pfs[p]) { | |
382 | sock = socket(pfs[p++], SOCK_DGRAM, 0); | |
383 | } | |
384 | if (!sock) return 0; | |
385 | ||
386 | memset(&ifr, 0, sizeof(ifr)); | |
387 | strncpy(ifr.ifr_name, device, IFNAMSIZ); | |
388 | ||
389 | if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) { | |
390 | retcode = 0; | |
391 | } else if (ifr.ifr_flags & IFF_UP) { | |
392 | retcode = 1; | |
393 | } | |
394 | ||
395 | close(sock); | |
396 | return retcode; | |
397 | } | |
398 | ||
399 | ||
400 | /* very, very minimal hangup function. This is just to attempt to | |
401 | * hang up a device that should already be hung up, so it does not | |
402 | * need to be bulletproof. | |
403 | */ | |
404 | void | |
405 | hangup(shvarFile *ifcfg) { | |
406 | int fd; | |
407 | char *filename; | |
408 | struct termios ots, ts; | |
409 | ||
410 | filename = svGetValue(ifcfg, "MODEMPORT"); | |
411 | if (!filename) return; | |
412 | fd = open(filename, O_RDWR|O_NOCTTY|O_NONBLOCK); | |
413 | if (fd == -1) goto clean; | |
414 | if (tcgetattr(fd, &ts)) goto clean; | |
415 | ots = ts; | |
416 | write(fd, "\r", 1); /* tickle modems that do not like dropped DTR */ | |
417 | usleep(1000); | |
418 | cfsetospeed(&ts, B0); | |
419 | tcsetattr(fd, TCSANOW, &ts); | |
420 | usleep(100000); | |
421 | tcsetattr(fd, TCSANOW, &ots); | |
422 | ||
423 | clean: | |
424 | free(filename); | |
425 | } | |
426 | ||
427 | ||
428 | ||
429 | ||
430 | ||
431 | ||
432 | ||
433 | ||
434 | ||
435 | int | |
436 | main(int argc, char **argv) { | |
437 | int status, waited; | |
438 | char *device, *real_device, *physicalDevice = NULL; | |
439 | char *theBoot = NULL; | |
440 | shvarFile *ifcfg; | |
441 | sigset_t sigs; | |
442 | int pppdPid = 0; | |
443 | int timeout = 30; | |
444 | char *temp; | |
445 | struct timeval tv; | |
446 | int dieing = 0; | |
447 | int sendsig; | |
448 | int connectedOnce = 0; | |
449 | ||
450 | if (argc < 2) { | |
451 | fprintf (stderr, "usage: ppp-watch [ifcfg-]<logical-name> [boot]\n"); | |
452 | exit(30); | |
453 | } | |
454 | ||
455 | if (!strncmp(argv[1], "ifcfg-", 6)) { | |
456 | device = argv[1] + 6; | |
457 | } else { | |
458 | device = argv[1]; | |
459 | } | |
460 | ||
461 | detach(0, 0, device); /* prepare */ | |
462 | ||
463 | if (argc > 2 && !strcmp("boot", argv[2])) { | |
464 | theBoot = argv[2]; | |
465 | } | |
466 | ||
467 | ifcfg = shvarfilesGet(device); | |
468 | if (!ifcfg) cleanExit(28); | |
469 | ||
470 | real_device = svGetValue(ifcfg, "DEVICE"); | |
471 | if (!real_device) real_device = device; | |
472 | ||
473 | doPidFile(real_device); | |
474 | ||
475 | set_signal(SIGTERM, signal_handler); | |
476 | set_signal(SIGINT, signal_handler); | |
477 | set_signal(SIGHUP, signal_handler); | |
478 | set_signal(SIGIO, signal_handler); | |
479 | set_signal(SIGCHLD, signal_handler); | |
480 | if (theBoot) { | |
481 | set_signal(SIGALRM, signal_handler); | |
482 | alarm(30); | |
483 | } | |
484 | ||
485 | fork_exec(1, "/sbin/netreport", NULL, NULL, NULL); | |
486 | theSigchld = 0; | |
487 | ||
488 | /* don't set up the procmask until after we have received the netreport | |
489 | * signal | |
490 | */ | |
491 | sigemptyset(&sigs); | |
492 | sigaddset(&sigs, SIGTERM); | |
493 | sigaddset(&sigs, SIGINT); | |
494 | sigaddset(&sigs, SIGHUP); | |
495 | sigaddset(&sigs, SIGIO); | |
496 | sigaddset(&sigs, SIGCHLD); | |
497 | if (theBoot) sigaddset(&sigs, SIGALRM); | |
498 | sigprocmask(SIG_BLOCK, &sigs, NULL); | |
499 | ||
500 | /* prepare for sigsuspend later */ | |
501 | sigfillset(&sigs); | |
502 | sigdelset(&sigs, SIGTERM); | |
503 | sigdelset(&sigs, SIGINT); | |
504 | sigdelset(&sigs, SIGHUP); | |
505 | sigdelset(&sigs, SIGIO); | |
506 | sigdelset(&sigs, SIGCHLD); | |
507 | if (theBoot) sigdelset(&sigs, SIGALRM); | |
508 | ||
509 | fork_exec(0, "/etc/sysconfig/network-scripts/ifup-ppp", "daemon", device, theBoot); | |
510 | temp = svGetValue(ifcfg, "RETRYTIMEOUT"); | |
511 | if (temp) { | |
512 | timeout = atoi(temp); | |
513 | free(temp); | |
514 | } else { | |
515 | timeout = 30; | |
516 | } | |
517 | ||
518 | while (1) { | |
519 | sigsuspend(&sigs); | |
520 | ||
521 | if (theSigterm || theSigint) { | |
522 | theSigterm = theSigint = 0; | |
523 | ||
524 | if (dieing) sendsig = SIGKILL; | |
525 | else sendsig = SIGTERM; | |
526 | dieing = 1; | |
527 | ||
528 | if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; } | |
529 | physicalDevice = pppLogicalToPhysical(&pppdPid, real_device); | |
530 | if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; } | |
531 | if (!pppdPid) cleanExit(35); | |
532 | kill(pppdPid, sendsig); | |
533 | if (sendsig == SIGKILL) { | |
534 | kill(-pppdPid, SIGTERM); /* give it a chance to die nicely */ | |
535 | usleep(2500000); | |
536 | kill(-pppdPid, sendsig); | |
537 | hangup(ifcfg); | |
538 | cleanExit(32); | |
539 | } | |
540 | } | |
541 | ||
542 | if (theSighup) { | |
543 | theSighup = 0; | |
544 | if (ifcfg->parent) svCloseFile(ifcfg->parent); | |
545 | svCloseFile(ifcfg); | |
546 | ifcfg = shvarfilesGet(device); | |
547 | physicalDevice = pppLogicalToPhysical(&pppdPid, real_device); | |
548 | if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; } | |
549 | kill(pppdPid, SIGTERM); | |
550 | /* redial when SIGCHLD arrives, even if !PERSIST */ | |
551 | connectedOnce = 0; | |
552 | timeout = 0; /* redial immediately */ | |
553 | } | |
554 | ||
555 | if (theSigio) { | |
556 | theSigio = 0; | |
557 | if (connectedOnce) { | |
558 | if (physicalDevice) { free(physicalDevice); physicalDevice = NULL; } | |
559 | temp = svGetValue(ifcfg, "DISCONNECTTIMEOUT"); | |
560 | if (temp) { | |
561 | timeout = atoi(temp); | |
562 | free(temp); | |
563 | } else { | |
564 | timeout = 2; | |
565 | } | |
566 | } | |
567 | physicalDevice = pppLogicalToPhysical(NULL, real_device); | |
568 | if (physicalDevice) { | |
569 | if (interfaceStatus(physicalDevice)) { | |
570 | /* device is up */ | |
571 | detach(1, 0, NULL); | |
572 | connectedOnce = 1; | |
573 | } | |
574 | } | |
575 | } | |
576 | ||
577 | if (theSigchld) { | |
578 | theSigchld = 0; | |
579 | waited = wait3(&status, 0, NULL); | |
580 | if (waited < 0) continue; | |
581 | ||
582 | /* now, we need to kill any children of pppd still in pppd's | |
583 | * process group, in case they are hanging around. | |
584 | * pppd is dead (we just waited for it) but there is no | |
585 | * guarantee that its children are dead, and they will | |
586 | * hold the modem if we do not get rid of them. | |
587 | * We have kept the old pid/pgrp around in pppdPid. | |
588 | */ | |
589 | if (pppdPid) { | |
590 | kill(-pppdPid, SIGTERM); /* give it a chance to die nicely */ | |
591 | usleep(2500000); | |
592 | kill(-pppdPid, SIGKILL); | |
593 | hangup(ifcfg); | |
594 | } | |
595 | pppdPid = 0; | |
596 | ||
597 | if (!WIFEXITED(status)) cleanExit(29); | |
598 | if (dieing) cleanExit(WEXITSTATUS(status)); | |
599 | ||
600 | /* error conditions from which we do not expect to recover | |
601 | * without user intervention -- do not fill up the logs. | |
602 | */ | |
603 | switch (WEXITSTATUS(status)) { | |
604 | case 1: case 2: case 3: case 4: case 6: | |
605 | case 7: case 9: case 14: case 17: | |
606 | cleanExit(WEXITSTATUS(status)); | |
607 | break; | |
608 | default: | |
609 | break; | |
610 | } | |
611 | ||
612 | if ((WEXITSTATUS(status) == 8) || | |
613 | !connectedOnce || svTrueValue(ifcfg, "PERSIST", 0)) { | |
614 | temp = svGetValue(ifcfg, "RETRYTIMEOUT"); | |
615 | if (temp) { | |
616 | timeout = atoi(temp); | |
617 | free(temp); | |
618 | } else { | |
619 | timeout = 30; | |
620 | } | |
621 | if (connectedOnce) { | |
622 | memset(&tv, 0, sizeof(tv)); | |
623 | tv.tv_sec = timeout; | |
624 | select(0, NULL, NULL, NULL, &tv); | |
625 | } | |
626 | fork_exec(0, "/etc/sysconfig/network-scripts/ifup-ppp", "daemon", device, theBoot); | |
627 | } else { | |
628 | cleanExit(WEXITSTATUS(status)); | |
629 | } | |
630 | } | |
631 | ||
632 | if (theSigalrm) { | |
633 | detach(1, 34, NULL); | |
634 | } | |
635 | } | |
636 | } |