Commit | Line | Data |
---|---|---|
95f51977 | 1 | /* |
1c15e888 | 2 | * Copyright (c) 1986, 1988, 1990 Regents of the University of California. |
ca67e7b4 C |
3 | * All rights reserved. |
4 | * | |
1c15e888 C |
5 | * Redistribution and use in source and binary forms are permitted provided |
6 | * that: (1) source distributions retain this entire copyright notice and | |
7 | * comment, and (2) distributions including binaries display the following | |
8 | * acknowledgement: ``This product includes software developed by the | |
9 | * University of California, Berkeley and its contributors'' in the | |
10 | * documentation or other materials provided with the distribution and in | |
11 | * all advertising materials mentioning features or use of this software. | |
12 | * Neither the name of the University nor the names of its contributors may | |
13 | * be used to endorse or promote products derived from this software without | |
14 | * specific prior written permission. | |
15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED | |
16 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF | |
17 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
95f51977 C |
18 | */ |
19 | ||
ca67e7b4 | 20 | #ifndef lint |
1c15e888 | 21 | static char sccsid[] = "@(#)ns_req.c 4.44 (Berkeley) 6/27/90"; |
ca67e7b4 C |
22 | #endif /* not lint */ |
23 | ||
95f51977 | 24 | #include <stdio.h> |
ca67e7b4 | 25 | #include <sys/param.h> |
95f51977 C |
26 | #include <sys/uio.h> |
27 | #include <sys/time.h> | |
ca67e7b4 | 28 | #include <sys/socket.h> |
95f51977 C |
29 | #include <netinet/in.h> |
30 | #include <syslog.h> | |
31 | #include <sys/file.h> | |
32 | #include <arpa/nameser.h> | |
33 | #include "ns.h" | |
34 | #include "db.h" | |
35 | ||
36 | #define NADDRECS 20 | |
37 | ||
ca67e7b4 C |
38 | extern int debug; |
39 | extern FILE *ddt; | |
40 | ||
95f51977 C |
41 | struct addinfo { |
42 | char *a_dname; /* domain name */ | |
43 | u_short a_class; /* class for address */ | |
44 | }; | |
45 | ||
46 | struct addinfo addinfo[NADDRECS]; /* additional info records */ | |
47 | int addcount; /* number of names in addinfo */ | |
ca67e7b4 C |
48 | int xfr_disabled = 0; /* set to disable zone xfrs */ |
49 | int needs_prime_cache = 0; /* set if we need a priming */ | |
95f51977 | 50 | |
ca67e7b4 | 51 | u_char *dnptrs[20]; /* ptrs to dnames in message for dn_comp */ |
95f51977 | 52 | |
ca67e7b4 C |
53 | extern time_t retrytime(); |
54 | extern struct qinfo *sysquery(); | |
55 | extern char *localdomain; /* XXX */ | |
95f51977 C |
56 | extern int errno; |
57 | /* | |
58 | * Process request using database; assemble and send response. | |
59 | */ | |
ca67e7b4 C |
60 | ns_req(msg, msglen, buflen, qsp, from, dfd) |
61 | u_char *msg; | |
95f51977 C |
62 | int msglen, buflen; |
63 | struct qstream *qsp; | |
64 | struct sockaddr_in *from; | |
ca67e7b4 | 65 | int dfd; |
95f51977 C |
66 | { |
67 | register HEADER *hp; | |
ca67e7b4 C |
68 | register u_char *cp; |
69 | struct namebuf *np; | |
95f51977 | 70 | register struct databuf *dp; |
95f51977 | 71 | struct hashbuf *htp; |
ca67e7b4 C |
72 | struct netinfo *lp; |
73 | char *fname, *answers; | |
74 | u_char *eom, *omsg; | |
95f51977 | 75 | char dnbuf[MAXDNAME], *dname; |
ca67e7b4 C |
76 | u_char **dpp; |
77 | int n, class, type, count, foundname, founddata, omsglen, cname = 0; | |
95f51977 | 78 | u_short id; |
ca67e7b4 | 79 | struct databuf *nsp[NSMAX]; |
95f51977 | 80 | struct qinfo *qp; |
95f51977 | 81 | extern struct qinfo *qhead; |
ca67e7b4 | 82 | extern struct netinfo *local(); |
95f51977 C |
83 | extern int nsid; |
84 | ||
85 | #ifdef DEBUG | |
86 | if (debug > 3) { | |
87 | fprintf(ddt,"ns_req()\n"); | |
88 | fp_query(msg, ddt); | |
89 | } | |
90 | #endif | |
91 | ||
92 | hp = (HEADER *) msg; | |
93 | if (hp->qr) { | |
94 | ns_resp(msg, msglen); | |
ca67e7b4 C |
95 | |
96 | /* Now is a safe time for housekeeping */ | |
97 | if (needs_prime_cache) | |
98 | prime_cache(); | |
95f51977 C |
99 | return; |
100 | } | |
101 | ||
95f51977 | 102 | hp->rcode = NOERROR; |
ca67e7b4 C |
103 | cp = msg + sizeof(HEADER); |
104 | eom = msg + msglen; | |
95f51977 C |
105 | dpp = dnptrs; |
106 | *dpp++ = msg; | |
107 | addcount = 0; | |
108 | ||
95f51977 C |
109 | switch (hp->opcode) { |
110 | case QUERY: | |
ca67e7b4 C |
111 | #ifdef STATS |
112 | stats[S_QUERIES].cnt++; | |
113 | #endif | |
95f51977 C |
114 | if (ntohs(hp->qdcount) != 1 || |
115 | hp->ancount || hp->nscount || hp->arcount) { | |
116 | #ifdef DEBUG | |
117 | if (debug) | |
118 | fprintf(ddt,"FORMERR Query header counts wrong\n"); | |
119 | #endif | |
120 | hp->qdcount = 0; | |
121 | hp->ancount = 0; | |
122 | hp->nscount = 0; | |
123 | hp->arcount = 0; | |
124 | hp->rcode = FORMERR; | |
ca67e7b4 | 125 | goto finish; |
95f51977 C |
126 | } |
127 | /* | |
128 | * Get domain name, class, and type. | |
129 | */ | |
130 | if ((*cp & INDIR_MASK) == 0) | |
131 | *dpp++ = cp; /* remember name for compression */ | |
132 | *dpp = NULL; | |
ca67e7b4 | 133 | if ((n = dn_expand(msg, eom, cp, dnbuf, |
95f51977 C |
134 | sizeof(dnbuf))) < 0) { |
135 | #ifdef DEBUG | |
136 | if (debug) | |
137 | fprintf(ddt,"FORMERR Query expand name failed\n"); | |
138 | #endif | |
139 | hp->rcode = FORMERR; | |
ca67e7b4 | 140 | goto finish; |
95f51977 C |
141 | } |
142 | cp += n; | |
ca67e7b4 C |
143 | GETSHORT(type, cp); |
144 | GETSHORT(class, cp); | |
145 | if (cp > eom) { | |
95f51977 C |
146 | #ifdef DEBUG |
147 | if (debug) | |
ca67e7b4 | 148 | fprintf(ddt,"FORMERR Query message length short\n"); |
95f51977 C |
149 | #endif |
150 | hp->rcode = FORMERR; | |
ca67e7b4 | 151 | goto finish; |
95f51977 C |
152 | } |
153 | #ifdef DEBUG | |
ca67e7b4 | 154 | if (cp < eom) |
95f51977 | 155 | if (debug > 5) |
ca67e7b4 | 156 | fprintf(ddt,"message length > received message\n"); |
95f51977 | 157 | #endif |
ca67e7b4 C |
158 | |
159 | #ifdef STATS | |
160 | if ((type > T_ANY) || (type < 0)) | |
161 | typestats[0]++; /* Bad type */ | |
162 | else | |
163 | typestats[type]++; | |
95f51977 C |
164 | #endif |
165 | /* | |
166 | * Process query. | |
167 | */ | |
168 | if (type == T_AXFR) { | |
169 | /* refuse request if not a TCP connection */ | |
ca67e7b4 C |
170 | if (qsp == QSTREAM_NULL || xfr_disabled) { |
171 | #ifdef DEBUG | |
172 | if (debug) | |
173 | fprintf(ddt,"T_AXFR via UDP refused\n"); | |
174 | #endif | |
95f51977 | 175 | hp->rcode = REFUSED; |
ca67e7b4 | 176 | goto finish; |
95f51977 | 177 | } |
ca67e7b4 C |
178 | dnptrs[0] = NULL; /* don't compress names */ |
179 | hp->rd = 0; /* recursion not possible */ | |
95f51977 C |
180 | } |
181 | buflen -= msglen; | |
182 | count = 0; | |
183 | foundname = 0; | |
184 | founddata = 0; | |
185 | dname = dnbuf; | |
ca67e7b4 | 186 | try_again: |
95f51977 C |
187 | #ifdef DEBUG |
188 | if (debug) | |
ca67e7b4 C |
189 | fprintf(ddt,"req: nlookup(%s) id %d type=%d\n", |
190 | dname, hp->id, type); | |
95f51977 C |
191 | #endif |
192 | htp = hashtab; /* lookup relative to root */ | |
ca67e7b4 C |
193 | if ((np = nlookup(dname, &htp, &fname, 0)) == NULL) |
194 | fname = ""; | |
195 | #ifdef DEBUG | |
196 | if (debug) | |
197 | fprintf(ddt,"req: %s '%s' as '%s' (cname=%d)\n", | |
198 | np == NULL ? "missed" : "found", | |
199 | dname, fname, cname); | |
200 | #endif | |
201 | /* START XXX */ | |
95f51977 C |
202 | /* |
203 | * if nlookup failed to find address then | |
204 | * see if there are any '.''s in the name | |
205 | * if not then add local domain name to the | |
206 | * name and try again. | |
207 | */ | |
ca67e7b4 C |
208 | if (np == NULL && localdomain && index(dname, '.') == NULL) { |
209 | (void) strcat(dname,"."); | |
210 | (void) strcat(dname, localdomain); | |
95f51977 | 211 | #ifdef DEBUG |
ca67e7b4 C |
212 | if (debug) |
213 | fprintf(ddt,"req: nlookup(%s) type=%d\n", | |
214 | dname, type); | |
95f51977 | 215 | #endif |
ca67e7b4 C |
216 | htp = hashtab; |
217 | np = nlookup(dname, &htp, &fname, 0); | |
95f51977 | 218 | } |
ca67e7b4 C |
219 | /* END XXX */ |
220 | if (np == NULL || fname != dname) | |
221 | goto fetchns; | |
95f51977 | 222 | |
ca67e7b4 C |
223 | foundname++; |
224 | answers = (char *)cp; | |
225 | count = cp - msg; | |
226 | n = finddata(np, class, type, hp, &dname, &buflen, &count); | |
227 | if (n == 0) | |
228 | goto fetchns; /* NO data available */ | |
229 | cp += n; | |
230 | buflen -= n; | |
231 | msglen += n; | |
232 | hp->ancount += count; | |
233 | if (fname != dname && type != T_CNAME && type != T_ANY) { | |
1c15e888 C |
234 | if (cname++ >= MAXCNAMES) { |
235 | #ifdef DEBUG | |
236 | if (debug >= 3) | |
237 | fprintf(ddt, | |
238 | "resp: leaving, MAXCNAMES exceeded\n"); | |
239 | #endif | |
240 | hp->rcode = SERVFAIL; | |
241 | goto finish; | |
242 | } | |
ca67e7b4 | 243 | goto try_again; |
95f51977 | 244 | } |
ca67e7b4 | 245 | founddata = 1; |
95f51977 | 246 | #ifdef DEBUG |
ca67e7b4 C |
247 | if (debug >= 3) { |
248 | fprintf(ddt,"req: foundname = %d count = %d ", foundname, count); | |
95f51977 C |
249 | fprintf(ddt,"founddata = %d cname = %d\n",founddata, cname); |
250 | } | |
251 | #endif | |
ca67e7b4 C |
252 | if ((lp = local(from)) != NULL) |
253 | sort_response(answers, count, lp, cp); | |
254 | if (type == T_AXFR) { | |
255 | if (founddata) { | |
256 | hp->ancount = htons(hp->ancount); | |
257 | startxfr(qsp, np, msg, cp - msg); | |
258 | return; | |
259 | } | |
260 | hp->rcode = REFUSED; /* No go if unauthoritative */ | |
261 | goto finish; | |
262 | } | |
263 | #ifdef notdef | |
264 | /* | |
265 | * If we found an authoritative answer, | |
266 | * we're done. | |
267 | */ | |
268 | if (hp->aa) | |
269 | goto finish; | |
270 | #endif | |
271 | ||
272 | fetchns: | |
273 | /* | |
274 | * Look for name servers to refer to and fill in the authority | |
275 | * section or record the address for forwarding the query | |
276 | * (recursion desired). | |
277 | */ | |
1c15e888 | 278 | nsp[0] = NULL; |
ca67e7b4 C |
279 | switch (findns(&np, class, nsp, &count)) { |
280 | case NXDOMAIN: | |
281 | if (!foundname) | |
282 | hp->rcode = NXDOMAIN; | |
95f51977 | 283 | #ifdef DEBUG |
ca67e7b4 C |
284 | if (debug >= 3) |
285 | fprintf(ddt,"req: leaving (%s, rcode %d)\n", | |
286 | dname, hp->rcode); | |
95f51977 | 287 | #endif |
ca67e7b4 C |
288 | if (class != C_ANY) { |
289 | hp->aa = 1; | |
1c15e888 | 290 | /* XXX |
ca67e7b4 C |
291 | * should return SOA if founddata == 0, |
292 | * but old named's are confused by an SOA | |
293 | * in the auth. section if there's no error. | |
95f51977 | 294 | */ |
ca67e7b4 C |
295 | if (foundname == 0 && np) { |
296 | n = doaddauth(hp, cp, buflen, np, nsp[0]); | |
297 | cp += n; | |
298 | buflen -= n; | |
95f51977 | 299 | } |
95f51977 | 300 | } |
ca67e7b4 C |
301 | goto finish; |
302 | ||
303 | case SERVFAIL: | |
1c15e888 C |
304 | if (!founddata) { |
305 | hp->rcode = SERVFAIL; | |
306 | goto finish; | |
307 | } | |
95f51977 | 308 | } |
ca67e7b4 | 309 | |
95f51977 | 310 | /* |
ca67e7b4 C |
311 | * If we successfully found the answer in the cache |
312 | * or this is not a recursive query, then add the | |
313 | * nameserver references here and return. | |
95f51977 | 314 | */ |
ca67e7b4 C |
315 | if (founddata || (!hp->rd)) { |
316 | n = add_data(np, nsp, cp, buflen); | |
317 | if (n < 0) { | |
318 | hp->tc = 1; | |
319 | n = (-n); | |
320 | } | |
321 | cp += n; | |
322 | buflen -= n; | |
323 | hp->nscount = htons((u_short)count); | |
324 | goto finish; | |
325 | } | |
326 | ||
327 | /* | |
328 | * At this point, we don't have the answer, but we do | |
329 | * have some NS's to try. If the user would like us | |
330 | * to recurse, create the initial query. If a cname | |
331 | * is involved, we need to build a new query and save | |
332 | * the old one in cmsg/cmsglen. | |
333 | */ | |
334 | if (cname) { | |
335 | omsg = (u_char *)malloc((unsigned)msglen); | |
336 | if (omsg == (u_char *)NULL) { | |
95f51977 C |
337 | #ifdef DEBUG |
338 | if (debug) | |
ca67e7b4 | 339 | fprintf(ddt,"ns_req: malloc fail\n"); |
95f51977 | 340 | #endif |
ca67e7b4 | 341 | syslog(LOG_ERR, "ns_req: Out Of Memory"); |
95f51977 C |
342 | hp->rcode = SERVFAIL; |
343 | break; | |
344 | } | |
ca67e7b4 C |
345 | id = hp->id; |
346 | hp->ancount = htons(hp->ancount); | |
347 | bcopy(msg, omsg, omsglen = msglen); | |
348 | msglen = res_mkquery(QUERY, dname, class, type, | |
349 | (char *)NULL, 0, NULL, msg, msglen+buflen); | |
350 | } | |
351 | n = ns_forw(nsp, msg, msglen, from, qsp, dfd, &qp); | |
352 | if (n != FW_OK && cname) | |
353 | free(omsg); | |
354 | switch (n) { | |
355 | case FW_OK: | |
356 | if (cname) { | |
1c15e888 | 357 | qp->q_cname = cname; |
ca67e7b4 C |
358 | qp->q_cmsg = (char *)omsg; |
359 | qp->q_cmsglen = omsglen; | |
95f51977 | 360 | qp->q_id = id; |
95f51977 | 361 | } |
ca67e7b4 C |
362 | break; |
363 | case FW_DUP: | |
364 | break; /* Duplicate request dropped */ | |
365 | case FW_NOSERVER: | |
366 | if(np) | |
367 | np = np->n_parent; | |
368 | goto fetchns; /* Try again. */ | |
369 | case FW_SERVFAIL: | |
370 | hp->rcode = SERVFAIL; | |
371 | goto finish; | |
95f51977 | 372 | } |
ca67e7b4 C |
373 | /* Now is a safe time for housekeeping */ |
374 | if (needs_prime_cache) | |
375 | prime_cache(); | |
376 | return; | |
95f51977 C |
377 | |
378 | case IQUERY: { | |
379 | register struct invbuf *ip; | |
380 | register int i; | |
381 | int dlen, alen; | |
382 | char anbuf[PACKETSZ], *data; | |
383 | ||
ca67e7b4 C |
384 | #ifdef STATS |
385 | stats[S_IQUERIES].cnt++; | |
386 | #endif | |
387 | hp->ancount = htons(hp->ancount); | |
388 | if (hp->ancount != 1 || | |
95f51977 C |
389 | hp->qdcount || hp->nscount || hp->arcount) { |
390 | #ifdef DEBUG | |
391 | if (debug) | |
392 | fprintf(ddt,"FORMERR IQuery header counts wrong\n"); | |
393 | #endif | |
394 | hp->qdcount = 0; | |
395 | hp->ancount = 0; | |
396 | hp->nscount = 0; | |
397 | hp->arcount = 0; | |
398 | hp->rcode = FORMERR; | |
ca67e7b4 | 399 | goto finish; |
95f51977 C |
400 | } |
401 | /* | |
402 | * Skip domain name, get class, and type. | |
403 | */ | |
ca67e7b4 | 404 | if ((n = dn_skipname(cp, eom)) < 0) { |
95f51977 C |
405 | #ifdef DEBUG |
406 | if (debug) | |
407 | fprintf(ddt,"FORMERR IQuery packet name problem\n"); | |
408 | #endif | |
409 | hp->rcode = FORMERR; | |
ca67e7b4 | 410 | goto finish; |
95f51977 C |
411 | } |
412 | cp += n; | |
ca67e7b4 C |
413 | GETSHORT(type, cp); |
414 | GETSHORT(class, cp); | |
415 | cp += sizeof(u_long); | |
416 | GETSHORT(dlen, cp); | |
417 | cp += dlen; | |
418 | if (cp != eom) { | |
95f51977 C |
419 | #ifdef DEBUG |
420 | if (debug) | |
421 | fprintf(ddt,"FORMERR IQuery message length off\n"); | |
422 | #endif | |
423 | hp->rcode = FORMERR; | |
ca67e7b4 | 424 | goto finish; |
95f51977 C |
425 | } |
426 | /* not all inverse queries are handled. */ | |
427 | switch (type) { | |
428 | case T_A: | |
429 | case T_UID: | |
430 | case T_GID: | |
431 | break; | |
432 | ||
433 | default: | |
434 | hp->rcode = REFUSED; | |
435 | goto finish; | |
436 | } | |
ca67e7b4 C |
437 | #ifdef DEBUG |
438 | if (debug) | |
439 | fprintf(ddt,"req: IQuery class %d type %d\n", | |
440 | class, type); | |
441 | #endif | |
442 | fname = (char *)msg + sizeof(HEADER); | |
443 | bcopy(fname, anbuf, alen = (char *)cp - fname); | |
95f51977 | 444 | data = anbuf + alen - dlen; |
ca67e7b4 | 445 | cp = (u_char *)fname; |
95f51977 C |
446 | buflen -= sizeof(HEADER); |
447 | count = 0; | |
448 | for (ip = invtab[dhash(data, dlen)]; ip != NULL; | |
449 | ip = ip->i_next) { | |
450 | for (i = 0; i < INVBLKSZ; i++) { | |
451 | if ((np = ip->i_dname[i]) == NULL) | |
452 | break; | |
453 | #ifdef DEBUG | |
454 | if (debug >= 5) | |
455 | fprintf(ddt,"dname = %d\n", np->n_dname); | |
456 | #endif | |
457 | for (dp = np->n_data; dp != NULL; dp = dp->d_next) { | |
458 | if (!match(dp, class, type)) | |
459 | continue; | |
460 | if (dp->d_size != dlen || | |
461 | bcmp(dp->d_data, data, dlen)) | |
462 | continue; | |
463 | getname(np, dnbuf, sizeof(dnbuf)); | |
ca67e7b4 C |
464 | #ifdef DEBUG |
465 | if (debug > 2) | |
466 | fprintf(ddt,"req: IQuery found %s\n", | |
467 | dnbuf); | |
468 | #endif | |
95f51977 C |
469 | buflen -= QFIXEDSZ; |
470 | if ((n = | |
471 | dn_comp(dnbuf, cp, buflen, (char **)NULL, | |
472 | (char **)NULL)) < 0) | |
473 | { | |
474 | hp->tc = 1; | |
475 | goto finish; | |
476 | } | |
477 | cp += n; | |
ca67e7b4 C |
478 | PUTSHORT((u_short)dp->d_type, cp); |
479 | PUTSHORT((u_short)dp->d_class, cp); | |
95f51977 C |
480 | buflen -= n; |
481 | count++; | |
482 | } | |
483 | } | |
484 | } | |
ca67e7b4 C |
485 | #ifdef DEBUG |
486 | if (debug) | |
487 | fprintf(ddt,"req: IQuery %d records\n", count); | |
488 | #endif | |
95f51977 C |
489 | hp->qdcount = htons((u_short)count); |
490 | if (alen > buflen) { | |
491 | hp->tc = 1; | |
492 | break; | |
493 | } | |
494 | bcopy(anbuf, cp, alen); | |
495 | cp += alen; | |
496 | break; | |
497 | } | |
498 | ||
ca67e7b4 C |
499 | #ifdef ALLOW_UPDATES |
500 | /* | |
501 | * In a sense the following constant should be defined in <arpa/nameser.h>, | |
502 | * since it is returned here in place of a response code if the update was | |
503 | * forwarded, and the response codes are defined in nameser.h. On the other | |
504 | * hand, though, this constant is only seen in this file. The assumption | |
505 | * here is that none of the other return codes equals this one (a good | |
506 | * assumption, since they only occupy 4 bits over-the-wire) | |
507 | */ | |
508 | #define FORWARDED 1000 | |
509 | /* Call InitDynUpdate for all dynamic update requests */ | |
510 | case UPDATEM: | |
511 | case UPDATEMA: | |
512 | case UPDATED: | |
513 | case UPDATEDA: | |
514 | case UPDATEA: | |
515 | n = InitDynUpdate(hp, nsp, msg, msglen, cp, from, qsp, dfd); | |
516 | if (n == FORWARDED) | |
517 | return; /* Return directly because InitDynUpdate | |
518 | * forwarded the query to the primary, so we | |
519 | * will send response later | |
520 | */ | |
521 | else | |
522 | break; /* Either sucessful primary update or failure; | |
523 | * return response code to client | |
524 | */ | |
525 | #endif ALLOW_UPDATES | |
95f51977 C |
526 | |
527 | case ZONEREF: | |
528 | #ifdef DEBUG | |
529 | if (debug) | |
530 | fprintf(ddt,"Refresh Zone\n"); | |
531 | #endif | |
532 | ||
533 | default: | |
ca67e7b4 C |
534 | #ifdef DEBUG |
535 | if (debug >= 2) | |
536 | fprintf(ddt,"Opcode %d not implemented\n", hp->opcode); | |
537 | #endif | |
95f51977 C |
538 | hp->qdcount = 0; |
539 | hp->ancount = 0; | |
540 | hp->nscount = 0; | |
541 | hp->arcount = 0; | |
ca67e7b4 | 542 | hp->rcode = NOTIMP; |
95f51977 C |
543 | } |
544 | finish: | |
ca67e7b4 C |
545 | #ifdef STATS |
546 | switch(hp->rcode) { | |
547 | case NOERROR: | |
548 | stats[S_RESPOK].cnt++; | |
549 | break; | |
550 | case FORMERR: | |
551 | stats[S_RESPFORMERR].cnt++; | |
552 | break; | |
553 | default: | |
554 | stats[S_RESPFAIL].cnt++; | |
555 | break; | |
556 | } | |
557 | #endif | |
95f51977 C |
558 | hp->qr = 1; /* set Response flag */ |
559 | hp->ra = 1; /* Recursion is Available */ | |
ca67e7b4 C |
560 | hp->ancount = htons(hp->ancount); |
561 | if (addcount) { | |
562 | n = doaddinfo(hp, cp, buflen); | |
563 | cp += n; | |
564 | buflen -= n; | |
565 | } | |
566 | ||
95f51977 | 567 | #ifdef DEBUG |
ca67e7b4 C |
568 | if (debug) { |
569 | fprintf(ddt,"req: answer -> %s %d (%d) id=%d %s\n", | |
1c15e888 C |
570 | inet_ntoa(from->sin_addr), |
571 | qsp == QSTREAM_NULL ? dfd : qsp->s_rfd, | |
572 | ntohs(from->sin_port), | |
ca67e7b4 C |
573 | ntohs(hp->id), local(from) == NULL ? "Remote" : "Local"); |
574 | } | |
95f51977 C |
575 | if (debug >= 10) |
576 | fp_query(msg, ddt); | |
ca67e7b4 | 577 | #endif DEBUG |
95f51977 | 578 | if (qsp == QSTREAM_NULL) { |
ca67e7b4 C |
579 | if (sendto(dfd, msg, cp-msg, 0, (struct sockaddr *)from, |
580 | sizeof(*from))< 0){ | |
95f51977 C |
581 | #ifdef DEBUG |
582 | if (debug) | |
ca67e7b4 C |
583 | fprintf(ddt,"error returning msg errno=%d\n",errno); |
584 | #endif DEBUG | |
95f51977 | 585 | } |
ca67e7b4 C |
586 | #ifdef STATS |
587 | stats[S_OUTPKTS].cnt++; | |
588 | #endif | |
95f51977 C |
589 | } else { |
590 | (void) writemsg(qsp->s_rfd, msg, cp - msg); | |
1c15e888 | 591 | sq_done(qsp); |
95f51977 | 592 | } |
ca67e7b4 C |
593 | if (needs_prime_cache) |
594 | prime_cache(); /* Now is a safe time */ | |
95f51977 C |
595 | } |
596 | ||
597 | fwritemsg(rfp, msg, msglen) | |
598 | FILE *rfp; | |
599 | char *msg; | |
600 | int msglen; | |
601 | { | |
602 | u_short len = htons((u_short)msglen); | |
603 | ||
604 | if (fwrite((char *)&len, sizeof(len), 1, rfp) != 1 || | |
605 | fwrite(msg, msglen, 1, rfp) != 1) { | |
606 | #ifdef DEBUG | |
607 | if (debug) | |
608 | fprintf(ddt,"fwrite failed %d\n", errno); | |
609 | #endif | |
95f51977 C |
610 | } |
611 | return; | |
612 | } | |
613 | ||
614 | writemsg(rfd, msg, msglen) | |
615 | int rfd; | |
616 | char *msg; | |
617 | int msglen; | |
618 | { | |
619 | struct iovec iov[2]; | |
620 | u_short len = htons((u_short)msglen); | |
621 | ||
622 | iov[0].iov_base = (caddr_t)&len; | |
623 | iov[0].iov_len = sizeof(len); | |
624 | iov[1].iov_base = msg; | |
625 | iov[1].iov_len = msglen; | |
626 | if (writev(rfd, iov, 2) != sizeof(len) + msglen) { | |
627 | #ifdef DEBUG | |
628 | if (debug) | |
629 | fprintf(ddt,"write failed %d\n", errno); | |
630 | #endif | |
95f51977 C |
631 | return (-1); |
632 | } | |
633 | return (0); | |
634 | } | |
635 | ||
ca67e7b4 C |
636 | /* |
637 | * Test a datum for validity and return non-zero if it is out of date. | |
638 | */ | |
639 | stale(dp) | |
640 | register struct databuf *dp; | |
641 | { | |
642 | register struct zoneinfo *zp = &zones[dp->d_zone]; | |
643 | ||
644 | switch (zp->z_type) { | |
645 | ||
646 | case Z_PRIMARY: | |
647 | return (0); | |
648 | ||
649 | case Z_SECONDARY: | |
1c15e888 C |
650 | /* |
651 | * Check to see whether a secondary zone | |
652 | * has expired; if so clear authority flag | |
653 | * for zone and return true. If lastupdate | |
654 | * is in the future, assume zone is up-to-date. | |
655 | */ | |
656 | if ((long)(tt.tv_sec - zp->z_lastupdate) > (long)zp->z_expire) { | |
657 | #ifdef DEBUG | |
658 | if (debug) | |
659 | fprintf(ddt, | |
660 | "stale: secondary zone %s expired\n", | |
661 | zp->z_origin); | |
662 | #endif | |
663 | syslog(LOG_ERR, "secondary zone \"%s\" expired\n", | |
664 | zp->z_origin); | |
665 | zp->z_auth = 0; | |
666 | return (1); | |
667 | } | |
668 | return (0); | |
ca67e7b4 C |
669 | |
670 | case Z_CACHE: | |
671 | #ifdef DEBUG | |
672 | if (debug >= 3) | |
673 | fprintf(ddt,"stale: ttl %d %d (x%x)\n", | |
674 | dp->d_ttl, dp->d_ttl - tt.tv_sec, dp->d_flags); | |
675 | #endif | |
676 | if (dp->d_flags & DB_F_HINT) | |
677 | return(0); | |
1c15e888 | 678 | return(dp->d_ttl < tt.tv_sec); |
ca67e7b4 C |
679 | |
680 | } | |
681 | /* NOTREACHED */ | |
682 | } | |
683 | ||
95f51977 C |
684 | /* |
685 | * Copy databuf into a resource record for replies. | |
ca67e7b4 | 686 | * Return size of RR if OK, -1 if buffer is full. |
95f51977 C |
687 | */ |
688 | make_rr(name, dp, buf, buflen, doadd) | |
689 | char *name; | |
690 | register struct databuf *dp; | |
691 | char *buf; | |
692 | int buflen, doadd; | |
693 | { | |
694 | register char *cp; | |
95f51977 | 695 | char *cp1, *sp; |
ca67e7b4 | 696 | struct zoneinfo *zp; |
95f51977 | 697 | register long n; |
ca67e7b4 C |
698 | register long ttl; |
699 | u_char **edp = dnptrs + sizeof(dnptrs)/sizeof(dnptrs[0]); | |
95f51977 C |
700 | |
701 | #ifdef DEBUG | |
702 | if (debug >= 5) | |
ca67e7b4 C |
703 | fprintf(ddt,"make_rr(%s, %x, %x, %d, %d) %d zone %d ttl %d\n", |
704 | name, dp, buf, | |
705 | buflen, doadd, dp->d_size, dp->d_zone, dp->d_ttl); | |
95f51977 C |
706 | #endif |
707 | ||
ca67e7b4 | 708 | zp = &zones[dp->d_zone]; |
1c15e888 | 709 | /* check for outdated RR before updating dnptrs by dn_comp() (???) */ |
ca67e7b4 | 710 | if (zp->z_type == Z_CACHE) { |
95f51977 | 711 | ttl = dp->d_ttl - (u_long) tt.tv_sec; |
1c15e888 | 712 | if ((dp->d_flags & DB_F_HINT) || (ttl < 0)) { |
ca67e7b4 | 713 | #ifdef DEBUG |
1c15e888 | 714 | /*XXX*/if (debug >= 3) fprintf(ddt,"make_rr: %d=>0, x%x\n", ttl, dp->d_flags); |
ca67e7b4 | 715 | #endif |
1c15e888 | 716 | ttl = 0; |
ca67e7b4 | 717 | } |
95f51977 | 718 | } else { |
1c15e888 | 719 | if (dp->d_ttl) |
95f51977 | 720 | ttl = dp->d_ttl; |
1c15e888 C |
721 | else |
722 | ttl = zp->z_minimum; /* really default */ | |
723 | #ifdef notdef /* don't decrease ttl based on time since verification */ | |
ca67e7b4 C |
724 | if (zp->z_type == Z_SECONDARY) { |
725 | /* | |
726 | * Set ttl to value received from primary, | |
727 | * less time since we verified it (but never | |
728 | * less than a small positive value). | |
729 | */ | |
730 | ttl -= tt.tv_sec - zp->z_lastupdate; | |
731 | if (ttl <= 0) | |
732 | ttl = 120; | |
733 | } | |
1c15e888 | 734 | #endif |
95f51977 C |
735 | } |
736 | ||
737 | buflen -= RRFIXEDSZ; | |
738 | if ((n = dn_comp(name, buf, buflen, (char **)dnptrs, (char **)edp)) < 0) | |
739 | return (-1); | |
740 | cp = buf + n; | |
741 | buflen -= n; | |
ca67e7b4 C |
742 | PUTSHORT((u_short)dp->d_type, cp); |
743 | PUTSHORT((u_short)dp->d_class, cp); | |
744 | PUTLONG(ttl, cp); | |
95f51977 C |
745 | sp = cp; |
746 | cp += sizeof(u_short); | |
747 | switch (dp->d_type) { | |
748 | case T_CNAME: | |
749 | case T_MG: | |
750 | case T_MR: | |
751 | case T_PTR: | |
752 | if ((n = dn_comp(dp->d_data, cp, buflen, (char **)dnptrs, | |
753 | (char **)edp)) < 0) | |
754 | return (-1); | |
ca67e7b4 | 755 | PUTSHORT((u_short)n, sp); |
95f51977 C |
756 | cp += n; |
757 | break; | |
758 | ||
759 | case T_MB: | |
760 | case T_NS: | |
761 | /* Store domain name in answer */ | |
762 | if ((n = dn_comp(dp->d_data, cp, buflen, (char **)dnptrs, | |
763 | (char **)edp)) < 0) | |
764 | return (-1); | |
ca67e7b4 | 765 | PUTSHORT((u_short)n, sp); |
95f51977 | 766 | cp += n; |
ca67e7b4 C |
767 | if (doadd) |
768 | addname(dp->d_data, dp->d_class); | |
95f51977 C |
769 | break; |
770 | ||
771 | case T_SOA: | |
772 | case T_MINFO: | |
773 | cp1 = dp->d_data; | |
774 | if ((n = dn_comp(cp1, cp, buflen, (char **)dnptrs, | |
775 | (char **)edp)) < 0) | |
776 | return (-1); | |
777 | cp += n; | |
778 | buflen -= dp->d_type == T_MINFO ? n : n + 5 * sizeof(u_long); | |
779 | cp1 += strlen(cp1) + 1; | |
780 | if ((n = dn_comp(cp1, cp, buflen, (char **)dnptrs, | |
781 | (char **)edp)) < 0) | |
782 | return (-1); | |
783 | cp += n; | |
784 | if (dp->d_type == T_SOA) { | |
785 | cp1 += strlen(cp1) + 1; | |
786 | bcopy(cp1, cp, | |
787 | (int)(n = dp->d_size - (cp1 - dp->d_data))); | |
788 | cp += n; | |
789 | } | |
ca67e7b4 C |
790 | n = (u_short)(cp - sp) - sizeof(u_short); |
791 | PUTSHORT((u_short)n, sp); | |
95f51977 C |
792 | break; |
793 | ||
794 | case T_MX: | |
795 | /* cp1 == our data/ cp == data of RR */ | |
796 | cp1 = dp->d_data; | |
797 | ||
798 | /* copy preference */ | |
799 | bcopy(cp1,cp,sizeof(u_short)); | |
800 | cp += sizeof(u_short); | |
801 | cp1 += sizeof(u_short); | |
802 | buflen -= sizeof(u_short); | |
803 | ||
804 | if ((n = dn_comp(cp1, cp, buflen, (char **)dnptrs, | |
805 | (char **)edp)) < 0) | |
806 | return(-1); | |
807 | cp += n; | |
808 | ||
809 | /* save data length */ | |
ca67e7b4 C |
810 | n = (u_short)(cp - sp) - sizeof(u_short); |
811 | PUTSHORT((u_short)n, sp); | |
812 | if (doadd) | |
813 | addname(cp1, dp->d_class); | |
814 | break; | |
95f51977 C |
815 | |
816 | default: | |
817 | if (dp->d_size > buflen) | |
818 | return (-1); | |
819 | bcopy(dp->d_data, cp, dp->d_size); | |
ca67e7b4 | 820 | PUTSHORT((u_short)dp->d_size, sp); |
95f51977 C |
821 | cp += dp->d_size; |
822 | } | |
823 | return (cp - buf); | |
824 | } | |
825 | ||
ca67e7b4 C |
826 | addname(name, class) |
827 | register char *name; | |
828 | short class; | |
829 | { | |
830 | register struct addinfo *ap; | |
831 | register int n; | |
832 | ||
833 | for (ap = addinfo, n = addcount; --n >= 0; ap++) | |
834 | if (strcasecmp(ap->a_dname, name) == 0) | |
835 | return; | |
836 | /* add domain name to additional section */ | |
837 | if (addcount < NADDRECS) { | |
838 | addcount++; | |
839 | ap->a_dname = name; | |
840 | ap->a_class = class; | |
841 | } | |
842 | } | |
843 | ||
95f51977 C |
844 | /* |
845 | * Lookup addresses for names in addinfo and put into the message's | |
846 | * additional section. | |
847 | */ | |
848 | doaddinfo(hp, msg, msglen) | |
849 | HEADER *hp; | |
850 | char *msg; | |
851 | int msglen; | |
852 | { | |
95f51977 C |
853 | register struct namebuf *np; |
854 | register struct databuf *dp; | |
ca67e7b4 C |
855 | register struct addinfo *ap; |
856 | register char *cp; | |
95f51977 | 857 | struct hashbuf *htp; |
95f51977 | 858 | char *fname; |
ca67e7b4 | 859 | int n, count, foundstale; |
95f51977 C |
860 | |
861 | #ifdef DEBUG | |
862 | if (debug >= 3) | |
863 | fprintf(ddt,"doaddinfo() addcount = %d\n", addcount); | |
864 | #endif | |
865 | ||
866 | count = 0; | |
867 | cp = msg; | |
868 | for (ap = addinfo; --addcount >= 0; ap++) { | |
869 | #ifdef DEBUG | |
ca67e7b4 | 870 | if (debug >= 3) |
95f51977 C |
871 | fprintf(ddt,"do additional '%s'\n", ap->a_dname); |
872 | #endif | |
ca67e7b4 | 873 | htp = hashtab; /* because "nlookup" stomps on arg. */ |
95f51977 C |
874 | np = nlookup(ap->a_dname, &htp, &fname, 0); |
875 | if (np == NULL || fname != ap->a_dname) | |
876 | continue; | |
877 | #ifdef DEBUG | |
ca67e7b4 | 878 | if (debug >= 3) |
95f51977 C |
879 | fprintf(ddt,"found it\n"); |
880 | #endif | |
ca67e7b4 | 881 | foundstale = 0; |
95f51977 | 882 | /* look for the data */ |
ca67e7b4 C |
883 | for (dp = np->n_data; dp != NULL; dp = dp->d_next) { |
884 | if (!match(dp, (int)ap->a_class, T_A)) | |
95f51977 | 885 | continue; |
ca67e7b4 C |
886 | if (stale(dp)) { |
887 | foundstale++; | |
95f51977 C |
888 | #ifdef DEBUG |
889 | if (debug) | |
ca67e7b4 C |
890 | fprintf(ddt,"doaddinfo: stale entry '%s'%s\n", |
891 | np->n_dname, | |
892 | (dp->d_flags&DB_F_HINT) ? " hint":"" ); | |
95f51977 | 893 | #endif |
95f51977 C |
894 | continue; |
895 | } | |
ca67e7b4 C |
896 | /* |
897 | * Should be smart and eliminate duplicate | |
898 | * data here. XXX | |
899 | */ | |
900 | if ((n = make_rr(ap->a_dname, dp, cp, msglen, 0)) < 0) | |
901 | break; | |
95f51977 C |
902 | #ifdef DEBUG |
903 | if (debug >= 5) | |
ca67e7b4 C |
904 | fprintf(ddt,"addinfo: adding address data n = %d\n", |
905 | n); | |
95f51977 C |
906 | #endif |
907 | cp += n; | |
908 | msglen -= n; | |
909 | count++; | |
ca67e7b4 C |
910 | } |
911 | if (foundstale) { | |
912 | /* Cache invalidate the address RR's */ | |
913 | delete_all(np, (int)ap->a_class, T_A); | |
914 | (void) sysquery(ap->a_dname, (int)ap->a_class, T_A); | |
95f51977 C |
915 | } |
916 | } | |
917 | hp->arcount = htons((u_short)count); | |
918 | return (cp - msg); | |
919 | } | |
920 | ||
ca67e7b4 C |
921 | doaddauth(hp, cp, buflen, np, dp) |
922 | register HEADER *hp; | |
923 | char *cp; | |
924 | int buflen; | |
925 | struct namebuf *np; | |
95f51977 | 926 | struct databuf *dp; |
95f51977 | 927 | { |
ca67e7b4 C |
928 | char dnbuf[MAXDNAME]; |
929 | int n; | |
95f51977 | 930 | |
ca67e7b4 C |
931 | getname(np, dnbuf, sizeof(dnbuf)); |
932 | if (stale(dp) || (n = make_rr(dnbuf, dp, cp, buflen, 1)) <= 0) { | |
95f51977 | 933 | #ifdef DEBUG |
ca67e7b4 C |
934 | if (debug) |
935 | fprintf(ddt,"doaddauth: can't add '%s' (%d)\n", | |
936 | dnbuf, buflen); | |
95f51977 | 937 | #endif |
ca67e7b4 C |
938 | return(0); |
939 | } else { | |
940 | hp->nscount = htons(1); | |
941 | return(n); | |
95f51977 | 942 | } |
95f51977 C |
943 | } |
944 | ||
ca67e7b4 | 945 | |
95f51977 | 946 | /* |
ca67e7b4 | 947 | * Get the domain name of 'np' and put in 'buf'. Bounds checking is done. |
95f51977 C |
948 | */ |
949 | getname(np, buf, buflen) | |
950 | struct namebuf *np; | |
951 | char *buf; | |
952 | int buflen; | |
953 | { | |
954 | register char *cp; | |
ca67e7b4 | 955 | register int i; |
95f51977 C |
956 | |
957 | cp = buf; | |
958 | while (np != NULL) { | |
ca67e7b4 C |
959 | if ((i = strlen(np->n_dname))+1 >= buflen) { |
960 | *cp = '\0'; | |
961 | syslog(LOG_ERR, "domain name too long: %s...\n", buf); | |
962 | strcpy(buf, "Name_Too_Long"); | |
963 | return; | |
964 | } | |
95f51977 C |
965 | if (cp != buf) |
966 | *cp++ = '.'; | |
967 | (void) strcpy(cp, np->n_dname); | |
ca67e7b4 C |
968 | cp += i; |
969 | buflen -= (i+1); | |
95f51977 C |
970 | np = np->n_parent; |
971 | } | |
972 | *cp = '\0'; | |
973 | } | |
974 | ||
975 | /* | |
976 | * Do a zone transfer. SOA record already sent. | |
977 | */ | |
978 | doaxfr(np, rfp, isroot) | |
979 | register struct namebuf *np; | |
980 | FILE *rfp; | |
981 | int isroot; | |
982 | { | |
983 | register struct databuf *dp; | |
984 | register int n; | |
ca67e7b4 C |
985 | struct hashbuf *htp; |
986 | struct databuf *gdp; /* glue databuf */ | |
987 | struct namebuf *gnp; /* glue namebuf */ | |
95f51977 C |
988 | struct namebuf **npp, **nppend; |
989 | char msg[PACKETSZ]; | |
95f51977 | 990 | char *cp; |
ca67e7b4 | 991 | char *fname; |
95f51977 | 992 | char dname[MAXDNAME]; |
ca67e7b4 | 993 | HEADER *hp = (HEADER *) msg; |
95f51977 C |
994 | int fndns; |
995 | ||
996 | #ifdef DEBUG | |
997 | if (debug && isroot) | |
998 | fprintf(ddt,"doaxfr()\n"); | |
999 | #endif | |
1000 | fndns = 0; | |
1001 | hp->id = 0; | |
1002 | hp->opcode = QUERY; | |
ca67e7b4 C |
1003 | hp->aa = hp->tc = hp->ra = hp->pr = hp->rd = 0; |
1004 | hp->qr = 1; | |
95f51977 C |
1005 | hp->rcode = NOERROR; |
1006 | hp->qdcount = 0; | |
1007 | hp->ancount = htons(1); | |
1008 | hp->nscount = 0; | |
1009 | hp->arcount = 0; | |
1010 | cp = msg + sizeof(HEADER); | |
1011 | getname(np, dname, sizeof(dname)); | |
1012 | ||
1013 | /* first do data records */ | |
1014 | for (dp = np->n_data; dp != NULL; dp = dp->d_next) { | |
ca67e7b4 C |
1015 | /* |
1016 | * Skip the root SOA record (marks end of data); | |
1017 | * don't send SOA for subdomains, as we're not sending them. | |
1018 | */ | |
1019 | if (dp->d_type == T_SOA) | |
1020 | continue; | |
1021 | if (dp->d_type == T_NS) | |
95f51977 | 1022 | fndns = 1; |
ca67e7b4 | 1023 | if (dp->d_zone == 0 || stale(dp)) |
95f51977 | 1024 | continue; |
ca67e7b4 | 1025 | if ((n = make_rr(dname, dp, cp, sizeof(msg)-sizeof(HEADER), 0)) < 0) |
95f51977 C |
1026 | continue; |
1027 | fwritemsg(rfp, msg, n + sizeof(HEADER)); | |
ca67e7b4 C |
1028 | |
1029 | if (dp->d_type == T_NS) { | |
1030 | /* Glue the sub domains together by sending | |
1031 | * the address records for the sub domain | |
1032 | * name servers along. | |
1033 | */ | |
1034 | htp = hashtab; | |
1035 | cp = msg + sizeof(HEADER); | |
1036 | gnp = nlookup(dp->d_data, &htp, &fname, 0); | |
1037 | if (gnp == NULL || fname != dp->d_data) | |
1038 | continue; | |
1039 | for(gdp=gnp->n_data; gdp != NULL; gdp=gdp->d_next) { | |
1040 | if (gdp->d_type != T_A || stale(gdp)) | |
1041 | continue; | |
1042 | if ((n = make_rr(fname, gdp, cp, | |
1043 | sizeof(msg)-sizeof(HEADER), 0)) < 0) | |
1044 | continue; | |
1045 | fwritemsg(rfp, msg, n + sizeof(HEADER)); | |
1046 | } | |
1047 | } | |
95f51977 C |
1048 | } |
1049 | ||
ca67e7b4 C |
1050 | /* next do subdomains, unless delegated */ |
1051 | if ((isroot == 0 && fndns) || np->n_hash == NULL) | |
95f51977 C |
1052 | return; |
1053 | npp = np->n_hash->h_tab; | |
1054 | nppend = npp + np->n_hash->h_size; | |
1055 | while (npp < nppend) { | |
1056 | for (np = *npp++; np != NULL; np = np->n_next) { | |
1057 | doaxfr(np, rfp, 0); | |
1058 | } | |
1059 | } | |
1060 | #ifdef DEBUG | |
1061 | if (debug && isroot) | |
1062 | fprintf(ddt,"exit doaxfr()\n"); | |
1063 | #endif | |
1064 | } | |
ca67e7b4 C |
1065 | |
1066 | #ifdef ALLOW_UPDATES | |
1067 | /* | |
1068 | * Called by UPDATE{A,D,DA,M,MA} to initiate a dynamic update. If this is the | |
1069 | * primary server for the zone being updated, we update the zone's serial | |
1070 | * number and then call doupdate directly. If this is a secondary, we just | |
1071 | * forward the update; this way, if the primary update fails (e.g., if the | |
1072 | * primary is unavailable), we don't update the secondary; if the primary | |
1073 | * update suceeds, ns_resp will get called with the response (when it comes | |
1074 | * in), and then update the secondary's copy. | |
1075 | */ | |
1076 | InitDynUpdate(hp, nsp, msg, msglen, startcp, from, qsp, dfd) | |
1077 | register HEADER *hp; | |
1078 | struct databuf *nsp[]; | |
1079 | char *msg; | |
1080 | int msglen; | |
1c15e888 | 1081 | u_char *startcp; |
ca67e7b4 C |
1082 | struct sockaddr_in *from; |
1083 | struct qstream *qsp; | |
1084 | int dfd; | |
1085 | { | |
1086 | struct zoneinfo *zp; | |
1087 | char dnbuf[MAXDNAME]; | |
1088 | struct hashbuf *htp = hashtab; /* lookup relative to root */ | |
1089 | struct namebuf *np; | |
1090 | struct databuf *olddp, *newdp, *dp; | |
1091 | struct databuf **nspp; | |
1092 | char *fname; | |
ca67e7b4 C |
1093 | register u_char *cp = startcp; |
1094 | short class, type; | |
1095 | int n, size, zonenum; | |
1096 | char ZoneName[MAXDNAME], *znp; | |
1097 | ||
1098 | if ((n = dn_expand(msg, msg + msglen, cp, dnbuf, sizeof(dnbuf))) < 0) { | |
1099 | #ifdef DEBUG | |
1100 | if (debug) | |
1101 | fprintf(ddt,"FORMERR InitDynUpdate expand name failed\n"); | |
1102 | #endif | |
1103 | hp->rcode = FORMERR; | |
1104 | return(FORMERR); | |
1105 | } | |
1106 | cp += n; | |
1107 | GETSHORT(type, cp); | |
1108 | if (type == T_SOA) { /* T_SOA updates not allowed */ | |
1109 | hp->rcode = REFUSED; | |
1110 | #ifdef DEBUG | |
1111 | if (debug) | |
1112 | fprintf(ddt, "InitDynUpdate: REFUSED - SOA update\n"); | |
1113 | #endif | |
1114 | return(REFUSED); | |
1115 | } | |
1116 | GETSHORT(class, cp); | |
1117 | cp += sizeof(u_long); | |
1118 | GETSHORT(size, cp); | |
ca67e7b4 C |
1119 | /****XXX - need bounds checking here ****/ |
1120 | cp += size; | |
1121 | ||
1122 | if ((zonenum = findzone(dnbuf, class)) == 0) { /* zone not found */ | |
1123 | hp->rcode = NXDOMAIN; | |
1124 | return(NXDOMAIN); | |
1125 | } | |
1126 | zp = &zones[zonenum]; | |
1127 | ||
1128 | /* Disallow updates for which we aren't authoratative. Note: the | |
1129 | following test doesn't work right: If it's for a non-local zone, | |
1130 | we will think it's a primary but be unable to lookup the namebuf, | |
1131 | thus returning 'NXDOMAIN' */ | |
1132 | if (zp->z_type != Z_PRIMARY && zp->z_type != Z_SECONDARY) { | |
1133 | hp->rcode = REFUSED; | |
1134 | #ifdef DEBUG | |
1135 | if (debug) | |
1136 | fprintf(ddt, "InitDynUpdate: REFUSED - non-primary, non-sedondary update\n"); | |
1137 | #endif | |
1138 | return(REFUSED); | |
1139 | } | |
1c15e888 C |
1140 | if (!(zp->z_state & Z_DYNAMIC)) { |
1141 | hp->rcode = REFUSED; | |
1142 | #ifdef DEBUG | |
1143 | if (debug) | |
1144 | fprintf(ddt, "InitDynUpdate: REFUSED - dynamic flag not set for zone\n"); | |
1145 | #endif | |
1146 | return(REFUSED); | |
1147 | } | |
ca67e7b4 C |
1148 | |
1149 | /* | |
1150 | * Lookup the zone namebuf. Lookup "xyz" not "xyz.", since | |
1151 | * otherwise the lookup fails, because '.' may have a nil n_hash | |
1152 | * associated with it. | |
1153 | */ | |
1154 | strcpy(ZoneName, zp->z_origin); | |
1155 | znp = &ZoneName[strlen(ZoneName) - 1]; | |
1156 | if (*znp == '.') | |
1157 | *znp = NULL; | |
1158 | np = nlookup(ZoneName, &htp, &fname, 0); | |
1159 | if ((np == NULL) || (fname != ZoneName)) { | |
1160 | #ifdef DEBUG | |
1161 | if (debug) | |
1162 | fprintf(ddt, "InitDynUpdate: lookup failed on zone (%s)\n", | |
1163 | ZoneName); | |
1164 | #endif DEBUG | |
1165 | syslog(LOG_ERR, "InitDynUpdate: lookup failed on zone (%s)\n", | |
1166 | ZoneName); | |
1167 | hp->rcode = NXDOMAIN; | |
1168 | return(NXDOMAIN); | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | * If this is the primary copy increment the serial number. Don't | |
1173 | * increment the serial number if this is a secondary; this way, if 2 | |
1174 | * different secondaries both update the primary, they will both have | |
1175 | * lower serial numbers than the primary has, and hence eventually | |
1176 | * refresh and get all updates and become consistent. | |
1177 | * | |
1178 | * Note that the serial number must be incremented in both the zone | |
1179 | * data structure and the zone's namebuf. | |
1180 | */ | |
1181 | switch (zp->z_type) { | |
1182 | case Z_SECONDARY: /* forward update to primary */ | |
1183 | nspp = nsp; | |
1184 | dp = np->n_data; | |
1185 | while (dp != NULL) { | |
1186 | if (match(dp, class, T_NS)) { | |
1187 | if (nspp < &nsp[NSMAX-1]) | |
1188 | *nspp++ = dp; | |
1189 | else | |
1190 | break; | |
1191 | } | |
1192 | dp = dp->d_next; | |
1193 | } | |
1194 | *nspp = NULL; /* Delimiter */ | |
1195 | if (ns_forw(nsp, msg, msglen, from, qsp, dfd, NULL) < 0) { | |
1196 | hp->rcode = SERVFAIL; | |
1197 | return(SERVFAIL); | |
1198 | } | |
1199 | return(FORWARDED); | |
1200 | ||
1201 | case Z_PRIMARY: | |
1202 | zp->z_serial++; | |
1203 | olddp = np->n_data; /* old databuf */ | |
1204 | /* Find the SOA record */ | |
1205 | for (olddp = np->n_data; olddp != NULL; olddp = olddp->d_next) | |
1206 | if (match(olddp, class, T_SOA)) | |
1207 | break; | |
1208 | if (olddp == NULL) { | |
1209 | #ifdef DEBUG | |
1210 | if (debug) | |
1211 | fprintf(ddt,"InitDynUpdate: Couldn't find SOA record for '%s'\n", | |
1212 | ZoneName); | |
1213 | #endif DEBUG | |
1214 | syslog(LOG_ERR, | |
1215 | "InitDynUpdate: Couldn't find SOA record for '%s'\n" | |
1216 | , | |
1217 | ZoneName); | |
1218 | hp->rcode = NXDOMAIN; | |
1219 | return(NXDOMAIN); | |
1220 | } | |
1221 | newdp = savedata(olddp->d_class, olddp->d_type, olddp->d_ttl, | |
1222 | olddp->d_data, olddp->d_size); | |
1223 | newdp->d_zone = olddp->d_zone; | |
1c15e888 | 1224 | cp = (u_char *)newdp->d_data; |
ca67e7b4 C |
1225 | cp += strlen(cp) + 1; /* skip origin string */ |
1226 | cp += strlen(cp) + 1; /* skip in-charge string */ | |
1227 | putlong((u_long)(zp->z_serial), cp); | |
1228 | #ifdef DEBUG | |
1229 | if (debug >= 4) { | |
1230 | fprintf(ddt, "after stuffing data into newdp:\n"); | |
1231 | printSOAdata(newdp); | |
1232 | } | |
1233 | #endif DEBUG | |
1234 | ||
1235 | if ((n = db_update(ZoneName, olddp, newdp, DB_DELETE, | |
1236 | hashtab)) != NOERROR) { | |
1237 | #ifdef DEBUG | |
1238 | if (debug) | |
1239 | fprintf(ddt,"InitDynUpdate: SOA update failed\n"); | |
1240 | #endif DEBUG | |
1241 | hp->rcode = NOCHANGE; | |
1242 | return(NOCHANGE); | |
1243 | } | |
1244 | ||
1245 | /* Now update the RR itself */ | |
1246 | if (doupdate(msg, msglen, msg + sizeof(HEADER), | |
1247 | zonenum, (struct databuf *)0, DB_NODATA) < 0) { | |
1248 | #ifdef DEBUG | |
1249 | if (debug) | |
1250 | fprintf(ddt,"InitDynUpdate: doupdate failed\n"); | |
1251 | #endif DEBUG | |
1252 | /* doupdate fills in rcode */ | |
1253 | return(hp->rcode); | |
1254 | } | |
1255 | zp->hasChanged++; | |
1256 | return(NOERROR); | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | #ifdef DEBUG | |
1261 | /* | |
1262 | * Print the contents of the data in databuf pointed to by dp for an SOA record | |
1263 | */ | |
1264 | printSOAdata(dp) | |
1265 | struct databuf *dp; | |
1266 | { | |
1267 | register u_char *cp; | |
1268 | ||
1269 | if (!debug) | |
1270 | return; /* Otherwise fprintf to ddt will bomb */ | |
1c15e888 | 1271 | cp = (u_char *)dp->d_data; |
ca67e7b4 C |
1272 | fprintf(ddt, "printSOAdata(%x): origin(%x)='%s'\n", dp, cp, cp); |
1273 | cp += strlen(cp) + 1; /* skip origin string */ | |
1274 | fprintf(ddt, "printSOAdata: in-charge(%x)='%s'\n", cp, cp); | |
1275 | cp += strlen(cp) + 1; /* skip in-charge string */ | |
1276 | fprintf(ddt, "printSOAdata: serial(%x)=%d\n", cp, _getlong(cp)); | |
1277 | } | |
1278 | #endif DEBUG | |
1279 | #endif ALLOW_UPDATES | |
1280 | ||
1281 | struct databuf * | |
1282 | rm_datum(dp, np, pdp) | |
1283 | register struct databuf *pdp, *dp; | |
1284 | register struct namebuf *np; | |
1285 | { | |
1286 | register struct databuf *ndp = dp->d_next; | |
1287 | ||
1288 | #ifdef DEBUG | |
1289 | if (debug > 2) | |
1290 | fprintf(ddt, "rm_datum(%x, %x, %x) -> %x\n", | |
1291 | dp, np->n_data, pdp, ndp); | |
1292 | #endif DEBUG | |
1293 | if (pdp == NULL) | |
1294 | np->n_data = ndp; | |
1295 | else | |
1296 | pdp->d_next = ndp; | |
1297 | rminv(dp); | |
1298 | (void) free((char *)dp); | |
1299 | return(ndp); | |
1300 | } | |
1301 | ||
1302 | startxfr(qsp, np, msg, msglen) | |
1303 | struct qstream *qsp; | |
1304 | struct namebuf *np; | |
1305 | char *msg; | |
1306 | int msglen; | |
1307 | { | |
1308 | register FILE *rfp; | |
1309 | int fdstat; | |
1310 | ||
1311 | #ifdef DEBUG | |
1312 | if (debug >= 5) | |
1313 | fprintf(ddt,"startxfr()\n"); | |
1314 | #endif | |
1315 | /* | |
1316 | * child does the work while | |
1317 | * the parent continues | |
1318 | */ | |
1319 | if (fork() == 0) { | |
1320 | #ifdef DEBUG | |
1321 | if (debug >= 5) | |
1322 | fprintf(ddt,"startxfr: child pid %d\n", getpid()); | |
1323 | #endif | |
1324 | rfp = fdopen(qsp->s_rfd, "w"); | |
1325 | setproctitle("zone XFR to", qsp->s_rfd); | |
1326 | fdstat = fcntl(qsp->s_rfd, F_GETFL, 0); | |
1327 | if (fdstat != -1) | |
1328 | (void) fcntl(qsp->s_rfd, F_SETFL, fdstat & ~FNDELAY); | |
1329 | fwritemsg(rfp, msg, msglen); | |
1330 | doaxfr(np, rfp, 1); | |
1331 | fwritemsg(rfp, msg, msglen); | |
1332 | (void) fflush(rfp); | |
1333 | exit(0); | |
1334 | } | |
1c15e888 | 1335 | sqrm(qsp); |
ca67e7b4 | 1336 | } |