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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1986, 1988 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)ns_maint.c 4.39 (Berkeley) 3/2/91"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | #include <sys/param.h> | |
39 | #include <sys/socket.h> | |
40 | #include <sys/time.h> | |
41 | #if defined(SYSV) | |
42 | #include <unistd.h> | |
43 | #endif SYSV | |
44 | #include <netinet/in.h> | |
45 | #include <stdio.h> | |
46 | #include <syslog.h> | |
47 | #include <signal.h> | |
48 | #include <errno.h> | |
49 | #include <arpa/nameser.h> | |
50 | #include <sys/wait.h> | |
51 | #include "ns.h" | |
52 | #include "db.h" | |
53 | #include "pathnames.h" | |
54 | ||
55 | extern int errno; | |
56 | extern int maint_interval; | |
57 | extern int needzoneload; | |
58 | extern u_short ns_port; | |
59 | extern char *ctime(); | |
60 | ||
61 | int xfers_running; /* number of xfers running */ | |
62 | int xfers_deferred; /* number of needed xfers not run yet */ | |
63 | static int alarm_pending; | |
64 | ||
65 | ||
66 | /* | |
67 | * Invoked at regular intervals by signal interrupt; refresh all secondary | |
68 | * zones from primary name server and remove old cache entries. Also, | |
69 | * ifdef'd ALLOW_UPDATES, dump database if it has changed since last | |
70 | * dump/bootup. | |
71 | */ | |
72 | ns_maint() | |
73 | { | |
74 | register struct zoneinfo *zp; | |
75 | struct itimerval ival; | |
76 | time_t next_refresh = 0; | |
77 | int zonenum; | |
78 | ||
79 | gettime(&tt); | |
80 | ||
81 | #ifdef DEBUG | |
82 | if (debug) | |
83 | fprintf(ddt,"\nns_maint(); now %s", ctime(&tt.tv_sec)); | |
84 | #endif | |
85 | ||
86 | xfers_deferred = 0; | |
87 | alarm_pending = 0; | |
88 | for (zp = zones, zonenum = 0; zp < &zones[nzones]; zp++, zonenum++) { | |
89 | #ifdef DEBUG | |
90 | if (debug >= 2) | |
91 | printzoneinfo(zonenum); | |
92 | #endif | |
93 | if (tt.tv_sec >= zp->z_time && zp->z_refresh > 0) { | |
94 | /* | |
95 | * Set default time for next action first, | |
96 | * so that it can be changed later if necessary. | |
97 | */ | |
98 | zp->z_time = tt.tv_sec + zp->z_refresh; | |
99 | ||
100 | switch (zp->z_type) { | |
101 | ||
102 | case Z_CACHE: | |
103 | doachkpt(); | |
104 | break; | |
105 | ||
106 | case Z_SECONDARY: | |
107 | if ((zp->z_state & Z_NEED_RELOAD) == 0) { | |
108 | if (zp->z_state & Z_XFER_RUNNING) | |
109 | abortxfer(zp); | |
110 | else if (xfers_running < MAX_XFERS_RUNNING) | |
111 | startxfer(zp); | |
112 | else { | |
113 | zp->z_state |= Z_NEED_XFER; | |
114 | ++xfers_deferred; | |
115 | #ifdef DEBUG | |
116 | if (debug > 1) | |
117 | fprintf(ddt, | |
118 | "xfer deferred for %s\n", | |
119 | zp->z_origin); | |
120 | #endif | |
121 | } | |
122 | } | |
123 | break; | |
124 | #ifdef ALLOW_UPDATES | |
125 | case Z_PRIMARY: | |
126 | /* | |
127 | * Checkpoint the zone if it has changed | |
128 | * since we last checkpointed | |
129 | */ | |
130 | if (zp->hasChanged) | |
131 | zonedump(zp); | |
132 | break; | |
133 | #endif ALLOW_UPDATES | |
134 | } | |
135 | gettime(&tt); | |
136 | } | |
137 | } | |
138 | sched_maint(); | |
139 | #ifdef DEBUG | |
140 | if (debug) | |
141 | fprintf(ddt,"exit ns_maint()\n"); | |
142 | #endif | |
143 | } | |
144 | ||
145 | /* | |
146 | * Find when the next refresh needs to be and set | |
147 | * interrupt time accordingly. | |
148 | */ | |
149 | sched_maint() | |
150 | { | |
151 | register struct zoneinfo *zp; | |
152 | struct itimerval ival; | |
153 | time_t next_refresh = 0; | |
154 | static time_t next_alarm; | |
155 | ||
156 | for (zp = zones; zp < &zones[nzones]; zp++) | |
157 | if (zp->z_time != 0 && | |
158 | (next_refresh == 0 || next_refresh > zp->z_time)) | |
159 | next_refresh = zp->z_time; | |
160 | /* | |
161 | * Schedule the next call to ns_maint. | |
162 | * Don't visit any sooner than maint_interval. | |
163 | */ | |
164 | bzero((char *)&ival, sizeof (ival)); | |
165 | if (next_refresh != 0) { | |
166 | if (next_refresh == next_alarm && alarm_pending) { | |
167 | #ifdef DEBUG | |
168 | if (debug) | |
169 | fprintf(ddt,"sched_maint: no schedule change\n"); | |
170 | #endif | |
171 | return; | |
172 | } | |
173 | ival.it_value.tv_sec = next_refresh - tt.tv_sec; | |
174 | if (ival.it_value.tv_sec < maint_interval) | |
175 | ival.it_value.tv_sec = maint_interval; | |
176 | next_alarm = next_refresh; | |
177 | alarm_pending = 1; | |
178 | } | |
179 | (void) setitimer(ITIMER_REAL, &ival, (struct itimerval *)NULL); | |
180 | #ifdef DEBUG | |
181 | if (debug) | |
182 | fprintf(ddt,"sched_maint: Next interrupt in %d sec\n", | |
183 | ival.it_value.tv_sec); | |
184 | #endif | |
185 | } | |
186 | ||
187 | /* | |
188 | * Start an asynchronous zone transfer for a zone. | |
189 | * Depends on current time being in tt. | |
190 | * The caller must call sched_maint after startxfer. | |
191 | */ | |
192 | startxfer(zp) | |
193 | struct zoneinfo *zp; | |
194 | { | |
195 | static char *argv[NSMAX + 20], argv_ns[NSMAX][MAXDNAME]; | |
196 | int cnt, argc = 0, argc_ns = 0, pid, omask; | |
197 | char debug_str[10]; | |
198 | char serial_str[10]; | |
199 | char port_str[10]; | |
200 | ||
201 | #ifdef DEBUG | |
202 | if (debug) | |
203 | fprintf(ddt,"startxfer() %s\n", zp->z_origin); | |
204 | #endif | |
205 | ||
206 | argv[argc++] = "named-xfer"; | |
207 | argv[argc++] = "-z"; | |
208 | argv[argc++] = zp->z_origin; | |
209 | argv[argc++] = "-f"; | |
210 | argv[argc++] = zp->z_source; | |
211 | argv[argc++] = "-s"; | |
212 | sprintf(serial_str, "%d", zp->z_serial); | |
213 | argv[argc++] = serial_str; | |
214 | if (zp->z_state & Z_SYSLOGGED) | |
215 | argv[argc++] = "-q"; | |
216 | argv[argc++] = "-P"; | |
217 | sprintf(port_str, "%d", ns_port); | |
218 | argv[argc++] = port_str; | |
219 | #ifdef DEBUG | |
220 | if (debug) { | |
221 | argv[argc++] = "-d"; | |
222 | sprintf(debug_str, "%d", debug); | |
223 | argv[argc++] = debug_str; | |
224 | argv[argc++] = "-l"; | |
225 | argv[argc++] = "/usr/tmp/xfer.ddt"; | |
226 | if (debug > 5) { | |
227 | argv[argc++] = "-t"; | |
228 | argv[argc++] = "/usr/tmp/xfer.trace"; | |
229 | } | |
230 | } | |
231 | #endif | |
232 | ||
233 | /* | |
234 | * Copy the server ip addresses into argv, after converting | |
235 | * to ascii and saving the static inet_ntoa result | |
236 | */ | |
237 | for (cnt = 0; cnt < zp->z_addrcnt; cnt++) | |
238 | argv[argc++] = strcpy(argv_ns[argc_ns++], | |
239 | inet_ntoa(zp->z_addr[cnt])); | |
240 | ||
241 | argv[argc] = 0; | |
242 | ||
243 | #ifdef DEBUG | |
244 | #ifdef ECHOARGS | |
245 | if (debug) { | |
246 | int i; | |
247 | for (i = 0; i < argc; i++) | |
248 | fprintf(ddt, "Arg %d=%s\n", i, argv[i]); | |
249 | } | |
250 | #endif /* ECHOARGS */ | |
251 | #endif /* DEBUG */ | |
252 | ||
253 | #ifdef SYSV | |
254 | #define vfork fork | |
255 | #else | |
256 | gettime(&tt); | |
257 | omask = sigblock(sigmask(SIGCHLD)); | |
258 | #endif | |
259 | if ((pid = vfork()) == -1) { | |
260 | #ifdef DEBUG | |
261 | if (debug) | |
262 | fprintf(ddt, "xfer [v]fork: %d\n", errno); | |
263 | #endif | |
264 | syslog(LOG_ERR, "xfer [v]fork: %m"); | |
265 | #ifndef SYSV | |
266 | (void) sigsetmask(omask); | |
267 | #endif | |
268 | zp->z_time = tt.tv_sec + 10; | |
269 | return; | |
270 | } | |
271 | ||
272 | if (pid) { | |
273 | #ifdef DEBUG | |
274 | if (debug) | |
275 | fprintf(ddt, "started xfer child %d\n", pid); | |
276 | #endif | |
277 | zp->z_state &= ~Z_NEED_XFER; | |
278 | zp->z_state |= Z_XFER_RUNNING; | |
279 | zp->z_xferpid = pid; | |
280 | xfers_running++; | |
281 | zp->z_time = tt.tv_sec + MAX_XFER_TIME; | |
282 | #ifndef SYSV | |
283 | (void) sigsetmask(omask); | |
284 | #endif | |
285 | } else { | |
286 | execve(_PATH_XFER, argv, NULL); | |
287 | syslog(LOG_ERR, "can't exec %s: %m", _PATH_XFER); | |
288 | _exit(XFER_FAIL); /* avoid duplicate buffer flushes */ | |
289 | } | |
290 | } | |
291 | ||
292 | #ifdef DEBUG | |
293 | printzoneinfo(zonenum) | |
294 | int zonenum; | |
295 | { | |
296 | struct timeval tt; | |
297 | struct zoneinfo *zp = &zones[zonenum]; | |
298 | char *ZoneType; | |
299 | ||
300 | if (!debug) | |
301 | return; /* Else fprintf to ddt will bomb */ | |
302 | fprintf(ddt, "printzoneinfo(%d):\n", zonenum); | |
303 | ||
304 | gettime(&tt); | |
305 | switch (zp->z_type) { | |
306 | case Z_PRIMARY: ZoneType = "Primary"; break; | |
307 | case Z_SECONDARY: ZoneType = "Secondary"; break; | |
308 | case Z_CACHE: ZoneType = "Cache"; break; | |
309 | default: ZoneType = "Unknown"; | |
310 | } | |
311 | if (zp->z_origin[0] == '\0') | |
312 | fprintf(ddt,"origin ='.'"); | |
313 | else | |
314 | fprintf(ddt,"origin ='%s'", zp->z_origin); | |
315 | fprintf(ddt,", type = %s", ZoneType); | |
316 | fprintf(ddt,", source = %s\n", zp->z_source); | |
317 | fprintf(ddt,"z_refresh = %ld", zp->z_refresh); | |
318 | fprintf(ddt,", retry = %ld", zp->z_retry); | |
319 | fprintf(ddt,", expire = %ld", zp->z_expire); | |
320 | fprintf(ddt,", minimum = %ld", zp->z_minimum); | |
321 | fprintf(ddt,", serial = %ld\n", zp->z_serial); | |
322 | fprintf(ddt,"z_time = %d", zp->z_time); | |
323 | if (zp->z_time) { | |
324 | fprintf(ddt,", now time : %d sec", tt.tv_sec); | |
325 | fprintf(ddt,", time left: %d sec", zp->z_time - tt.tv_sec); | |
326 | } | |
327 | fprintf(ddt,"; state %x\n", zp->z_state); | |
328 | } | |
329 | #endif DEBUG | |
330 | ||
331 | /* | |
332 | * remove_zone (htp, zone) -- | |
333 | * Delete all RR's in the zone "zone" under specified hash table. | |
334 | */ | |
335 | remove_zone(htp, zone) | |
336 | register struct hashbuf *htp; | |
337 | register int zone; | |
338 | { | |
339 | register struct databuf *dp, *pdp; | |
340 | register struct namebuf *np; | |
341 | struct namebuf **npp, **nppend; | |
342 | ||
343 | nppend = htp->h_tab + htp->h_size; | |
344 | for (npp = htp->h_tab; npp < nppend; npp++) | |
345 | for (np = *npp; np != NULL; np = np->n_next) { | |
346 | for (pdp = NULL, dp = np->n_data; dp != NULL; ) { | |
347 | if (dp->d_zone == zone) | |
348 | dp = rm_datum(dp, np, pdp); | |
349 | else { | |
350 | pdp = dp; | |
351 | dp = dp->d_next; | |
352 | } | |
353 | } | |
354 | /* Call recursively to remove subdomains. */ | |
355 | if (np->n_hash) | |
356 | remove_zone(np->n_hash, zone); | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * Abort an xfer that has taken too long. | |
362 | */ | |
363 | abortxfer(zp) | |
364 | register struct zoneinfo *zp; | |
365 | { | |
366 | ||
367 | kill(zp->z_xferpid, SIGKILL); /* don't trust it at all */ | |
368 | #ifdef DEBUG | |
369 | if (debug) | |
370 | fprintf(ddt, "Killed child %d (zone %s) due to timeout\n", | |
371 | zp->z_xferpid, zp->z_origin); | |
372 | #endif /* DEBUG */ | |
373 | zp->z_time = tt.tv_sec + zp->z_retry; | |
374 | } | |
375 | ||
376 | #ifdef SYSV | |
377 | union wait { | |
378 | unsigned short w_termsig:7; /* termination signal */ | |
379 | unsigned short w_coredump:1; /* core dump indicator */ | |
380 | unsigned short w_retcode:8; /* exit code if w_termsig==0 */ | |
381 | }; | |
382 | #endif | |
383 | ||
384 | /* | |
385 | * SIGCHLD signal handler: process exit of xfer's. | |
386 | * (Note: also called when outgoing transfer completes.) | |
387 | */ | |
388 | SIG_FN | |
389 | endxfer() | |
390 | { | |
391 | register struct zoneinfo *zp; | |
392 | int pid, xfers = 0; | |
393 | union wait status; | |
394 | ||
395 | gettime(&tt); | |
396 | #if defined(SYSV) | |
397 | { int stat; | |
398 | pid = wait(&stat); | |
399 | status.w_termsig = stat & 0x7f; | |
400 | status.w_retcode = stat >> 8; | |
401 | } | |
402 | #else /* SYSV */ | |
403 | while ((pid = | |
404 | wait3((int *)&status, WNOHANG, (struct rusage *)NULL)) > 0) { | |
405 | #endif /* SYSV */ | |
406 | for (zp = zones; zp < &zones[nzones]; zp++) | |
407 | if (zp->z_xferpid == pid) { | |
408 | xfers++; | |
409 | xfers_running--; | |
410 | zp->z_xferpid = 0; | |
411 | zp->z_state &= ~Z_XFER_RUNNING; | |
412 | #ifdef DEBUG | |
413 | if (debug) | |
414 | fprintf(ddt, | |
415 | "\nendxfer: child %d zone %s returned status=%d termsig=%d\n", | |
416 | pid, zp->z_origin, status.w_retcode, | |
417 | status.w_termsig); | |
418 | #endif | |
419 | if (status.w_termsig != 0) { | |
420 | if (status.w_termsig != SIGKILL) { | |
421 | syslog(LOG_ERR, | |
422 | "named-xfer exited with signal %d\n", | |
423 | status.w_termsig); | |
424 | #ifdef DEBUG | |
425 | if (debug) | |
426 | fprintf(ddt, | |
427 | "\tchild termination with signal %d\n", | |
428 | status.w_termsig); | |
429 | #endif | |
430 | } | |
431 | zp->z_time = tt.tv_sec + zp->z_retry; | |
432 | } else switch (status.w_retcode) { | |
433 | case XFER_UPTODATE: | |
434 | zp->z_state &= ~Z_SYSLOGGED; | |
435 | zp->z_lastupdate = tt.tv_sec; | |
436 | zp->z_time = tt.tv_sec + zp->z_refresh; | |
437 | /* | |
438 | * Restore z_auth in case expired, | |
439 | * but only if there were no errors | |
440 | * in the zone file. | |
441 | */ | |
442 | if ((zp->z_state & Z_DB_BAD) == 0) | |
443 | zp->z_auth = 1; | |
444 | if (zp->z_source) { | |
445 | #if defined(SYSV) | |
446 | struct utimbuf t; | |
447 | ||
448 | t.actime = tt.tv_sec; | |
449 | t.modtime = tt.tv_sec; | |
450 | (void) utime(zp->z_source, &t); | |
451 | #else | |
452 | struct timeval t[2]; | |
453 | ||
454 | t[0] = tt; | |
455 | t[1] = tt; | |
456 | (void) utimes(zp->z_source, t); | |
457 | #endif /* SYSV */ | |
458 | } | |
459 | break; | |
460 | ||
461 | case XFER_SUCCESS: | |
462 | zp->z_state |= Z_NEED_RELOAD; | |
463 | zp->z_state &= ~Z_SYSLOGGED; | |
464 | needzoneload++; | |
465 | break; | |
466 | ||
467 | case XFER_TIMEOUT: | |
468 | #ifdef DEBUG | |
469 | if (debug) fprintf(ddt, | |
470 | "zoneref: Masters for secondary zone %s unreachable\n", | |
471 | zp->z_origin); | |
472 | #endif | |
473 | if ((zp->z_state & Z_SYSLOGGED) == 0) { | |
474 | zp->z_state |= Z_SYSLOGGED; | |
475 | syslog(LOG_WARNING, | |
476 | "zoneref: Masters for secondary zone %s unreachable", | |
477 | zp->z_origin); | |
478 | } | |
479 | zp->z_time = tt.tv_sec + zp->z_retry; | |
480 | break; | |
481 | ||
482 | default: | |
483 | if ((zp->z_state & Z_SYSLOGGED) == 0) { | |
484 | zp->z_state |= Z_SYSLOGGED; | |
485 | syslog(LOG_ERR, | |
486 | "named-xfer exit code %d", | |
487 | status.w_retcode); | |
488 | } | |
489 | /* FALLTHROUGH */ | |
490 | case XFER_FAIL: | |
491 | zp->z_state |= Z_SYSLOGGED; | |
492 | zp->z_time = tt.tv_sec + zp->z_retry; | |
493 | break; | |
494 | } | |
495 | break; | |
496 | } | |
497 | #ifndef SYSV | |
498 | } | |
499 | #endif /* SYSV */ | |
500 | if (xfers) { | |
501 | for (zp = zones; | |
502 | xfers_deferred != 0 && xfers_running < MAX_XFERS_RUNNING && | |
503 | zp < &zones[nzones]; zp++) | |
504 | if (zp->z_state & Z_NEED_XFER) { | |
505 | xfers_deferred--; | |
506 | startxfer(zp); | |
507 | } | |
508 | sched_maint(); | |
509 | } | |
510 | #if defined(SYSV) | |
511 | (void)signal(SIGCLD, endxfer); | |
512 | #endif | |
513 | } | |
514 | ||
515 | /* | |
516 | * Reload zones whose transfers have completed. | |
517 | */ | |
518 | loadxfer() | |
519 | { | |
520 | register struct zoneinfo *zp; | |
521 | ||
522 | gettime(&tt); | |
523 | for (zp = zones; zp < &zones[nzones]; zp++) | |
524 | if (zp->z_state & Z_NEED_RELOAD) { | |
525 | #ifdef DEBUG | |
526 | if (debug) | |
527 | fprintf(ddt, "loadxfer() '%s'\n", | |
528 | zp->z_origin[0] ? zp->z_origin : "."); | |
529 | #endif | |
530 | zp->z_state &= ~Z_NEED_RELOAD; | |
531 | zp->z_auth = 0; | |
532 | remove_zone(hashtab, zp - zones); | |
533 | if (db_load(zp->z_source, zp->z_origin, zp, 0) == 0) | |
534 | zp->z_auth = 1; | |
535 | if (zp->z_state & Z_TMP_FILE) | |
536 | (void) unlink(zp->z_source); | |
537 | } | |
538 | sched_maint(); | |
539 | } |