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0658615f42d1a50d75a80e762c77ba4a776797e5
[adns] / src / types.c
1 /*
2 * types.c
3 * - RR-type-specific code, and the machinery to call it
4 */
5 /*
6 * This file is part of adns, which is
7 * Copyright (C) 1997-2000,2003,2006 Ian Jackson
8 * Copyright (C) 1999-2000,2003,2006 Tony Finch
9 * Copyright (C) 1991 Massachusetts Institute of Technology
10 * (See the file INSTALL for full details.)
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 */
26
27 #include <stdlib.h>
28
29 #include <sys/types.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
33
34 #include "internal.h"
35
36 #define R_NOMEM return adns_s_nomemory
37 #define CSP_ADDSTR(s) do { \
38 if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
39 } while (0)
40
41 /*
42 * order of sections:
43 *
44 * _string (pap)
45 * _textdata, _qstring (csp)
46 * _str (mf,cs)
47 * _intstr (mf,csp,cs)
48 * _manyistr (mf,cs)
49 * _txt (pa)
50 * _inaddr (pa,di,cs
51 * +search_sortlist, dip_genaddr, csp_genaddr)
52 * _in6addr (pa,di,cs)
53 * _addr (pa,di,div,csp,cs,gsz
54 * +search_sortlist_sa, dip_sockaddr)
55 * _domain (pap,csp,cs)
56 * _dom_raw (pa)
57 * _host_raw (pa)
58 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs
59 * +pap_findaddrs, icb_hostaddr)
60 * _mx_raw (pa,di)
61 * _mx (pa,di)
62 * _inthostaddr (mf,cs)
63 * _inthost (cs)
64 * _ptr (ckl,pa +icb_ptr)
65 * _strpair (mf)
66 * _intstrpair (mf)
67 * _hinfo (pa)
68 * _mailbox (pap,csp +pap_mailbox822)
69 * _rp (pa,cs)
70 * _soa (pa,mf,cs)
71 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
72 * _byteblock (mf)
73 * _opaque (pa,cs)
74 * _flat (mf)
75 *
76 * within each section:
77 * ckl_*
78 * pap_*
79 * pa_*
80 * dip_*
81 * di_*
82 * mfp_*
83 * mf_*
84 * csp_*
85 * cs_*
86 * gsz_*
87 * postsort_*
88 * qs_*
89 */
90
91 /*
92 * _qstring (pap,csp)
93 */
94
95 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
96 int *len_r, char **str_r) {
97 /* Neither len_r nor str_r may be null.
98 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
99 */
100 const byte *dgram= pai->dgram;
101 int l, cbyte;
102 char *str;
103
104 cbyte= *cbyte_io;
105
106 if (cbyte >= max) return adns_s_invaliddata;
107 GET_B(cbyte,l);
108 if (cbyte+l > max) return adns_s_invaliddata;
109
110 str= adns__alloc_interim(pai->qu, l+1);
111 if (!str) R_NOMEM;
112
113 str[l]= 0;
114 memcpy(str,dgram+cbyte,l);
115
116 *len_r= l;
117 *str_r= str;
118 *cbyte_io= cbyte+l;
119
120 return adns_s_ok;
121 }
122
123 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
124 unsigned char ch;
125 char buf[10];
126 int cn;
127
128 CSP_ADDSTR("\"");
129 for (cn=0; cn<len; cn++) {
130 ch= *dp++;
131 if (ch == '\\') {
132 CSP_ADDSTR("\\\\");
133 } else if (ch == '"') {
134 CSP_ADDSTR("\\\"");
135 } else if (ch >= 32 && ch <= 126) {
136 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
137 } else {
138 sprintf(buf,"\\x%02x",ch);
139 CSP_ADDSTR(buf);
140 }
141 }
142 CSP_ADDSTR("\"");
143
144 return adns_s_ok;
145 }
146
147 /*
148 * _str (mf)
149 */
150
151 static void mf_str(adns_query qu, void *datap) {
152 char **rrp= datap;
153
154 adns__makefinal_str(qu,rrp);
155 }
156
157 /*
158 * _intstr (mf)
159 */
160
161 static void mf_intstr(adns_query qu, void *datap) {
162 adns_rr_intstr *rrp= datap;
163
164 adns__makefinal_str(qu,&rrp->str);
165 }
166
167 /*
168 * _manyistr (mf)
169 */
170
171 static void mf_manyistr(adns_query qu, void *datap) {
172 adns_rr_intstr **rrp= datap;
173 adns_rr_intstr *te, *table;
174 void *tablev;
175 int tc;
176
177 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
178 tablev= *rrp;
179 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
180 *rrp= table= tablev;
181 for (te= *rrp; te->i >= 0; te++)
182 adns__makefinal_str(qu,&te->str);
183 }
184
185 /*
186 * _txt (pa,cs)
187 */
188
189 static adns_status pa_txt(const parseinfo *pai, int cbyte,
190 int max, void *datap) {
191 adns_rr_intstr **rrp= datap, *table, *te;
192 const byte *dgram= pai->dgram;
193 int ti, tc, l, startbyte;
194 adns_status st;
195
196 startbyte= cbyte;
197 if (cbyte >= max) return adns_s_invaliddata;
198 tc= 0;
199 while (cbyte < max) {
200 GET_B(cbyte,l);
201 cbyte+= l;
202 tc++;
203 }
204 if (cbyte != max || !tc) return adns_s_invaliddata;
205
206 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
207 if (!table) R_NOMEM;
208
209 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
210 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
211 if (st) return st;
212 }
213 assert(cbyte == max);
214
215 te->i= -1;
216 te->str= 0;
217
218 *rrp= table;
219 return adns_s_ok;
220 }
221
222 static adns_status cs_txt(vbuf *vb, const void *datap) {
223 const adns_rr_intstr *const *rrp= datap;
224 const adns_rr_intstr *current;
225 adns_status st;
226 int spc;
227
228 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
229 if (spc) CSP_ADDSTR(" ");
230 st= csp_qstring(vb,current->str,current->i); if (st) return st;
231 }
232 return adns_s_ok;
233 }
234
235 /*
236 * _hinfo (cs)
237 */
238
239 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
240 const adns_rr_intstrpair *rrp= datap;
241 adns_status st;
242
243 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
244 CSP_ADDSTR(" ");
245 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
246 return adns_s_ok;
247 }
248
249 /*
250 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
251 */
252
253 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
254 int max, void *datap) {
255 struct in_addr *storeto= datap;
256
257 if (max-cbyte != 4) return adns_s_invaliddata;
258 memcpy(storeto, pai->dgram + cbyte, 4);
259 return adns_s_ok;
260 }
261
262 static int search_sortlist(adns_state ads, int af, const void *ad) {
263 const struct sortlist *slp;
264 int i;
265
266 for (i=0, slp=ads->sortlist;
267 i<ads->nsortlist &&
268 !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask);
269 i++, slp++);
270 return i;
271 }
272
273 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
274 int ai, bi;
275
276 if (!ads->nsortlist) return 0;
277
278 ai= search_sortlist(ads,af,a);
279 bi= search_sortlist(ads,af,b);
280 return bi<ai;
281 }
282
283 static int di_inaddr(adns_state ads,
284 const void *datap_a, const void *datap_b) {
285 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
286 }
287
288 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
289 char buf[ADNS_ADDR2TEXT_BUFLEN];
290 int len= sizeof(buf);
291 adns_rr_addr a;
292 int err;
293
294 memset(&a, 0, sizeof(a));
295 a.addr.sa.sa_family= af;
296 adns__sockaddr_inject(p, 0, &a.addr.sa);
297 err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
298 CSP_ADDSTR(buf);
299 return adns_s_ok;
300 }
301
302 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
303 return csp_genaddr(vb, AF_INET,datap);
304 }
305
306 /*
307 * _in6addr (pa,di,cs)
308 */
309
310 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
311 int max, void *datap) {
312 struct in6_addr *storeto= datap;
313
314 if (max-cbyte != 16) return adns_s_invaliddata;
315 memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
316 return adns_s_ok;
317 }
318
319 static int di_in6addr(adns_state ads,
320 const void *datap_a, const void *datap_b) {
321 return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
322 }
323
324 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
325 return csp_genaddr(vb,AF_INET6,datap);
326 }
327
328 /*
329 * _addr (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr)
330 */
331
332 static adns_status pa_addr(const parseinfo *pai, int cbyte,
333 int max, void *datap) {
334 adns_rr_addr *storeto= datap;
335 const byte *dgram= pai->dgram;
336
337 if (max-cbyte != 4) return adns_s_invaliddata;
338 storeto->len= sizeof(storeto->addr.inet);
339 memset(&storeto->addr,0,sizeof(storeto->addr.inet));
340 storeto->addr.inet.sin_family= AF_INET;
341 memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
342 return adns_s_ok;
343 }
344
345 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
346 union gen_addr a;
347 adns__sockaddr_extract(sa, &a, 0);
348 return search_sortlist(ads, sa->sa_family, &a);
349 }
350
351 static int dip_sockaddr(adns_state ads,
352 const struct sockaddr *sa,
353 const struct sockaddr *sb) {
354 if (!ads->sortlist) return 0;
355 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
356 }
357
358 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
359 const adns_rr_addr *ap= datap_a, *bp= datap_b;
360 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
361 }
362
363 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
364 const adns_state ads= context;
365
366 return di_addr(ads, datap_a, datap_b);
367 }
368
369 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
370 char buf[ADNS_ADDR2TEXT_BUFLEN];
371 int len= sizeof(buf);
372 int err;
373
374 switch (rrp->addr.inet.sin_family) {
375 case AF_INET:
376 CSP_ADDSTR("INET ");
377 goto a2t;
378 case AF_INET6:
379 CSP_ADDSTR("INET6 ");
380 goto a2t;
381 a2t:
382 err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
383 CSP_ADDSTR(buf);
384 break;
385 default:
386 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
387 CSP_ADDSTR(buf);
388 break;
389 }
390 return adns_s_ok;
391 }
392
393 static adns_status cs_addr(vbuf *vb, const void *datap) {
394 const adns_rr_addr *rrp= datap;
395
396 return csp_addr(vb,rrp);
397 }
398
399 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
400 return type & adns__qtf_bigaddr ?
401 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
402 }
403
404 /*
405 * _domain (pap,csp,cs)
406 * _dom_raw (pa)
407 */
408
409 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
410 char **domain_r, parsedomain_flags flags) {
411 adns_status st;
412 char *dm;
413
414 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
415 pai->dgram,pai->dglen, cbyte_io, max);
416 if (st) return st;
417 if (!pai->qu->vb.used) return adns_s_invaliddata;
418
419 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
420 if (!dm) R_NOMEM;
421
422 dm[pai->qu->vb.used]= 0;
423 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
424
425 *domain_r= dm;
426 return adns_s_ok;
427 }
428
429 static adns_status csp_domain(vbuf *vb, const char *domain) {
430 CSP_ADDSTR(domain);
431 if (!*domain) CSP_ADDSTR(".");
432 return adns_s_ok;
433 }
434
435 static adns_status cs_domain(vbuf *vb, const void *datap) {
436 const char *const *domainp= datap;
437 return csp_domain(vb,*domainp);
438 }
439
440 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
441 int max, void *datap) {
442 char **rrp= datap;
443 adns_status st;
444
445 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
446 if (st) return st;
447
448 if (cbyte != max) return adns_s_invaliddata;
449 return adns_s_ok;
450 }
451
452 /*
453 * _host_raw (pa)
454 */
455
456 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
457 int max, void *datap) {
458 char **rrp= datap;
459 adns_status st;
460
461 st= pap_domain(pai, &cbyte, max, rrp,
462 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
463 if (st) return st;
464
465 if (cbyte != max) return adns_s_invaliddata;
466 return adns_s_ok;
467 }
468
469 /*
470 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
471 */
472
473 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
474 size_t addrsz,
475 int *cbyte_io, int count, int dmstart) {
476 int rri, naddrs;
477 int type, class, rdlen, rdstart, ownermatched;
478 unsigned long ttl;
479 adns_status st;
480
481 for (rri=0, naddrs=-1; rri<count; rri++) {
482 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
483 pai->dglen, cbyte_io,
484 &type, &class, &ttl, &rdlen, &rdstart,
485 pai->dgram, pai->dglen, dmstart, &ownermatched);
486 if (st) return st;
487 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
488 if (naddrs>0) break; else continue;
489 }
490 if (naddrs == -1) {
491 naddrs= 0;
492 }
493 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
494 R_NOMEM;
495 adns__update_expires(pai->qu,ttl,pai->now);
496 st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
497 if (st) return st;
498 naddrs++;
499 }
500 if (naddrs >= 0) {
501 ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
502 if (!ha->addrs) R_NOMEM;
503 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
504 ha->naddrs= naddrs;
505 ha->astatus= adns_s_ok;
506
507 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
508 div_addr, pai->ads);
509 }
510 return adns_s_ok;
511 }
512
513 static void icb_hostaddr(adns_query parent, adns_query child) {
514 adns_answer *cans= child->answer;
515 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
516 adns_state ads= parent->ads;
517 adns_status st;
518
519 st= cans->status;
520 rrp->astatus= st;
521 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
522 rrp->addrs= cans->rrs.addr;
523 adns__transfer_interim(child, parent, rrp->addrs);
524
525 if (parent->children.head) {
526 LIST_LINK_TAIL(ads->childw,parent);
527 } else {
528 adns__query_done(parent);
529 }
530 }
531
532 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
533 int max, adns_rr_hostaddr *rrp) {
534 adns_status st;
535 int dmstart, cbyte;
536 qcontext ctx;
537 int id;
538 adns_query nqu;
539 adns_queryflags nflags;
540 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
541
542 dmstart= cbyte= *cbyte_io;
543 st= pap_domain(pai, &cbyte, max, &rrp->host,
544 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
545 if (st) return st;
546 *cbyte_io= cbyte;
547
548 rrp->astatus= adns_s_ok;
549 rrp->naddrs= -1;
550 rrp->addrs= 0;
551
552 cbyte= pai->nsstart;
553
554 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
555 if (st) return st;
556 if (rrp->naddrs != -1) return adns_s_ok;
557
558 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
559 if (st) return st;
560 if (rrp->naddrs != -1) return adns_s_ok;
561
562 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
563 pai->dgram, pai->dglen, dmstart,
564 adns_r_addr, adns_qf_quoteok_query);
565 if (st) return st;
566
567 ctx.ext= 0;
568 ctx.callback= icb_hostaddr;
569 ctx.pinfo.hostaddr= rrp;
570 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
571
572 nflags= adns_qf_quoteok_query;
573 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
574
575 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
576 ((adns_r_addr & adns_rrt_reprmask) |
577 (pai->qu->answer->type & ~adns_rrt_reprmask)),
578 &pai->qu->vb, id, nflags, pai->now, &ctx);
579 if (st) return st;
580
581 nqu->parent= pai->qu;
582 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
583
584 return adns_s_ok;
585 }
586
587 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
588 int max, void *datap) {
589 adns_rr_hostaddr *rrp= datap;
590 adns_status st;
591
592 st= pap_hostaddr(pai, &cbyte, max, rrp);
593 if (st) return st;
594 if (cbyte != max) return adns_s_invaliddata;
595
596 return adns_s_ok;
597 }
598
599 static int dip_hostaddr(adns_state ads,
600 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
601 if (ap->astatus != bp->astatus) return ap->astatus;
602 if (ap->astatus) return 0;
603
604 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
605 }
606
607 static int di_hostaddr(adns_state ads,
608 const void *datap_a, const void *datap_b) {
609 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
610
611 return dip_hostaddr(ads, ap,bp);
612 }
613
614 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
615 void *tablev;
616 size_t addrsz= gsz_addr(0, qu->answer->type);
617
618 adns__makefinal_str(qu,&rrp->host);
619 tablev= rrp->addrs;
620 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
621 rrp->addrs= tablev;
622 }
623
624 static void mf_hostaddr(adns_query qu, void *datap) {
625 adns_rr_hostaddr *rrp= datap;
626
627 mfp_hostaddr(qu,rrp);
628 }
629
630 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
631 const char *errstr;
632 adns_status st;
633 char buf[20];
634 int i;
635
636 st= csp_domain(vb,rrp->host); if (st) return st;
637
638 CSP_ADDSTR(" ");
639 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
640
641 sprintf(buf," %d ",rrp->astatus);
642 CSP_ADDSTR(buf);
643
644 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
645 CSP_ADDSTR(" ");
646
647 errstr= adns_strerror(rrp->astatus);
648 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
649
650 if (rrp->naddrs >= 0) {
651 CSP_ADDSTR(" (");
652 for (i=0; i<rrp->naddrs; i++) {
653 CSP_ADDSTR(" ");
654 st= csp_addr(vb,&rrp->addrs[i]);
655 }
656 CSP_ADDSTR(" )");
657 } else {
658 CSP_ADDSTR(" ?");
659 }
660 return adns_s_ok;
661 }
662
663 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
664 const adns_rr_hostaddr *rrp= datap;
665
666 return csp_hostaddr(vb,rrp);
667 }
668
669 /*
670 * _mx_raw (pa,di)
671 */
672
673 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
674 int max, void *datap) {
675 const byte *dgram= pai->dgram;
676 adns_rr_intstr *rrp= datap;
677 adns_status st;
678 int pref;
679
680 if (cbyte+2 > max) return adns_s_invaliddata;
681 GET_W(cbyte,pref);
682 rrp->i= pref;
683 st= pap_domain(pai, &cbyte, max, &rrp->str,
684 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
685 if (st) return st;
686
687 if (cbyte != max) return adns_s_invaliddata;
688 return adns_s_ok;
689 }
690
691 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
692 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
693
694 if (ap->i < bp->i) return 0;
695 if (ap->i > bp->i) return 1;
696 return 0;
697 }
698
699 /*
700 * _mx (pa,di)
701 */
702
703 static adns_status pa_mx(const parseinfo *pai, int cbyte,
704 int max, void *datap) {
705 const byte *dgram= pai->dgram;
706 adns_rr_inthostaddr *rrp= datap;
707 adns_status st;
708 int pref;
709
710 if (cbyte+2 > max) return adns_s_invaliddata;
711 GET_W(cbyte,pref);
712 rrp->i= pref;
713 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
714 if (st) return st;
715
716 if (cbyte != max) return adns_s_invaliddata;
717 return adns_s_ok;
718 }
719
720 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
721 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
722
723 if (ap->i < bp->i) return 0;
724 if (ap->i > bp->i) return 1;
725 return dip_hostaddr(ads, &ap->ha, &bp->ha);
726 }
727
728 /*
729 * _inthostaddr (mf,cs)
730 */
731
732 static void mf_inthostaddr(adns_query qu, void *datap) {
733 adns_rr_inthostaddr *rrp= datap;
734
735 mfp_hostaddr(qu,&rrp->ha);
736 }
737
738 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
739 const adns_rr_inthostaddr *rrp= datap;
740 char buf[10];
741
742 sprintf(buf,"%u ",rrp->i);
743 CSP_ADDSTR(buf);
744
745 return csp_hostaddr(vb,&rrp->ha);
746 }
747
748 /*
749 * _inthost (cs)
750 */
751
752 static adns_status cs_inthost(vbuf *vb, const void *datap) {
753 const adns_rr_intstr *rrp= datap;
754 char buf[10];
755
756 sprintf(buf,"%u ",rrp->i);
757 CSP_ADDSTR(buf);
758 return csp_domain(vb,rrp->str);
759 }
760
761 /*
762 * _ptr (ckl,pa +icb_ptr)
763 */
764
765 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
766 union checklabel_state *cls, qcontext *ctx,
767 int labnum, const char *label, int lablen) {
768 if (lablen) {
769 if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
770 return adns_s_querydomainwrong;
771 } else {
772 if (adns__revparse_done(&cls->ptr, labnum,
773 &ctx->tinfo.ptr.rev_rrtype,
774 &ctx->tinfo.ptr.addr))
775 return adns_s_querydomainwrong;
776 }
777 return adns_s_ok;
778 }
779
780 static void icb_ptr(adns_query parent, adns_query child) {
781 adns_answer *cans= child->answer;
782 const struct af_addr *queried;
783 const unsigned char *found;
784 adns_state ads= parent->ads;
785 int i;
786
787 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
788 adns__query_fail(parent,adns_s_inconsistent);
789 return;
790 } else if (cans->status) {
791 adns__query_fail(parent,cans->status);
792 return;
793 }
794
795 queried= &parent->ctx.tinfo.ptr.addr;
796 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
797 if (adns__genaddr_equal_p(queried->af,&queried->addr,
798 parent->ctx.tinfo.ptr.addr.af,found)) {
799 if (!parent->children.head) {
800 adns__query_done(parent);
801 return;
802 } else {
803 LIST_LINK_TAIL(ads->childw,parent);
804 return;
805 }
806 }
807 }
808
809 adns__query_fail(parent,adns_s_inconsistent);
810 }
811
812 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
813 int max, void *datap) {
814 char **rrp= datap;
815 adns_status st;
816 adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
817 int cbyte, id;
818 adns_query nqu;
819 qcontext ctx;
820
821 cbyte= dmstart;
822 st= pap_domain(pai, &cbyte, max, rrp,
823 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
824 if (st) return st;
825 if (cbyte != max) return adns_s_invaliddata;
826
827 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
828 pai->dgram, pai->dglen, dmstart,
829 rrtype, adns_qf_quoteok_query);
830 if (st) return st;
831
832 ctx.ext= 0;
833 ctx.callback= icb_ptr;
834 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
835 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
836 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(rrtype),
837 rrtype, &pai->qu->vb, id,
838 adns_qf_quoteok_query, pai->now, &ctx);
839 if (st) return st;
840
841 nqu->parent= pai->qu;
842 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
843 return adns_s_ok;
844 }
845
846 /*
847 * _strpair (mf)
848 */
849
850 static void mf_strpair(adns_query qu, void *datap) {
851 adns_rr_strpair *rrp= datap;
852
853 adns__makefinal_str(qu,&rrp->array[0]);
854 adns__makefinal_str(qu,&rrp->array[1]);
855 }
856
857 /*
858 * _intstrpair (mf)
859 */
860
861 static void mf_intstrpair(adns_query qu, void *datap) {
862 adns_rr_intstrpair *rrp= datap;
863
864 adns__makefinal_str(qu,&rrp->array[0].str);
865 adns__makefinal_str(qu,&rrp->array[1].str);
866 }
867
868 /*
869 * _hinfo (pa)
870 */
871
872 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
873 int max, void *datap) {
874 adns_rr_intstrpair *rrp= datap;
875 adns_status st;
876 int i;
877
878 for (i=0; i<2; i++) {
879 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
880 if (st) return st;
881 }
882
883 if (cbyte != max) return adns_s_invaliddata;
884
885 return adns_s_ok;
886 }
887
888 /*
889 * _mailbox (pap,cs +pap_mailbox822)
890 */
891
892 static adns_status pap_mailbox822(const parseinfo *pai,
893 int *cbyte_io, int max, char **mb_r) {
894 int lablen, labstart, i, needquote, c, r, neednorm;
895 const unsigned char *p;
896 char *str;
897 findlabel_state fls;
898 adns_status st;
899 vbuf *vb;
900
901 vb= &pai->qu->vb;
902 vb->used= 0;
903 adns__findlabel_start(&fls, pai->ads,
904 -1, pai->qu,
905 pai->dgram, pai->dglen, max,
906 *cbyte_io, cbyte_io);
907 st= adns__findlabel_next(&fls,&lablen,&labstart);
908 if (!lablen) {
909 adns__vbuf_appendstr(vb,".");
910 goto x_ok;
911 }
912
913 neednorm= 1;
914 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
915 c= *p++;
916 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
917 if (c == '.' && !neednorm) neednorm= 1;
918 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
919 else neednorm= 0;
920 }
921
922 if (needquote || neednorm) {
923 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
924 adns__vbuf_appendq(vb,"\"",1);
925 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
926 c= *p;
927 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
928 adns__vbuf_appendq(vb,p,1);
929 }
930 adns__vbuf_appendq(vb,"\"",1);
931 } else {
932 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
933 }
934
935 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
936
937 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
938 if (st) return st;
939
940 x_ok:
941 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
942 memcpy(str,vb->buf,vb->used);
943 str[vb->used]= 0;
944 *mb_r= str;
945 return adns_s_ok;
946 }
947
948 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
949 char **mb_r) {
950 if (pai->qu->typei->typekey & adns__qtf_mail822) {
951 return pap_mailbox822(pai, cbyte_io, max, mb_r);
952 } else {
953 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
954 }
955 }
956
957 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
958 return csp_domain(vb,mailbox);
959 }
960
961 /*
962 * _rp (pa,cs)
963 */
964
965 static adns_status pa_rp(const parseinfo *pai, int cbyte,
966 int max, void *datap) {
967 adns_rr_strpair *rrp= datap;
968 adns_status st;
969
970 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
971 if (st) return st;
972
973 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
974 if (st) return st;
975
976 if (cbyte != max) return adns_s_invaliddata;
977 return adns_s_ok;
978 }
979
980 static adns_status cs_rp(vbuf *vb, const void *datap) {
981 const adns_rr_strpair *rrp= datap;
982 adns_status st;
983
984 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
985 CSP_ADDSTR(" ");
986 st= csp_domain(vb,rrp->array[1]); if (st) return st;
987
988 return adns_s_ok;
989 }
990
991 /*
992 * _soa (pa,mf,cs)
993 */
994
995 static adns_status pa_soa(const parseinfo *pai, int cbyte,
996 int max, void *datap) {
997 adns_rr_soa *rrp= datap;
998 const byte *dgram= pai->dgram;
999 adns_status st;
1000 int msw, lsw, i;
1001
1002 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1003 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1004 if (st) return st;
1005
1006 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1007 if (st) return st;
1008
1009 if (cbyte+20 != max) return adns_s_invaliddata;
1010
1011 for (i=0; i<5; i++) {
1012 GET_W(cbyte,msw);
1013 GET_W(cbyte,lsw);
1014 (&rrp->serial)[i]= (msw<<16) | lsw;
1015 }
1016
1017 return adns_s_ok;
1018 }
1019
1020 static void mf_soa(adns_query qu, void *datap) {
1021 adns_rr_soa *rrp= datap;
1022
1023 adns__makefinal_str(qu,&rrp->mname);
1024 adns__makefinal_str(qu,&rrp->rname);
1025 }
1026
1027 static adns_status cs_soa(vbuf *vb, const void *datap) {
1028 const adns_rr_soa *rrp= datap;
1029 char buf[20];
1030 int i;
1031 adns_status st;
1032
1033 st= csp_domain(vb,rrp->mname); if (st) return st;
1034 CSP_ADDSTR(" ");
1035 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1036
1037 for (i=0; i<5; i++) {
1038 sprintf(buf," %lu",(&rrp->serial)[i]);
1039 CSP_ADDSTR(buf);
1040 }
1041
1042 return adns_s_ok;
1043 }
1044
1045 /*
1046 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1047 */
1048
1049 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1050 union checklabel_state *cls, qcontext *ctx,
1051 int labnum, const char *label, int lablen) {
1052 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1053 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1054 return adns_s_ok;
1055 }
1056 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1057 }
1058
1059 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1060 adns_rr_srvha *rrp
1061 /* might be adns_rr_srvraw* */) {
1062 const byte *dgram= pai->dgram;
1063 int ti, cbyte;
1064
1065 cbyte= *cbyte_io;
1066 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1067
1068 rrp->priority= GET_W(cbyte, ti);
1069 rrp->weight= GET_W(cbyte, ti);
1070 rrp->port= GET_W(cbyte, ti);
1071 return adns_s_ok;
1072 }
1073
1074 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1075 int max, void *datap) {
1076 adns_rr_srvraw *rrp= datap;
1077 adns_status st;
1078
1079 st= pap_srv_begin(pai,&cbyte,max,datap);
1080 if (st) return st;
1081
1082 st= pap_domain(pai, &cbyte, max, &rrp->host,
1083 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1084 if (st) return st;
1085
1086 if (cbyte != max) return adns_s_invaliddata;
1087 return adns_s_ok;
1088 }
1089
1090 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1091 int max, void *datap) {
1092 adns_rr_srvha *rrp= datap;
1093 adns_status st;
1094
1095 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1096 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1097 if (cbyte != max) return adns_s_invaliddata;
1098 return adns_s_ok;
1099 }
1100
1101 static void mf_srvraw(adns_query qu, void *datap) {
1102 adns_rr_srvraw *rrp= datap;
1103 adns__makefinal_str(qu, &rrp->host);
1104 }
1105
1106 static void mf_srvha(adns_query qu, void *datap) {
1107 adns_rr_srvha *rrp= datap;
1108 mfp_hostaddr(qu,&rrp->ha);
1109 }
1110
1111 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1112 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1113 /* might be const adns_rr_svhostaddr* */
1114
1115 if (ap->priority < bp->priority) return 0;
1116 if (ap->priority > bp->priority) return 1;
1117 return 0;
1118 }
1119
1120 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1121 /* might be adns_rr_srvraw* */) {
1122 char buf[30];
1123 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1124 CSP_ADDSTR(buf);
1125 return adns_s_ok;
1126 }
1127
1128 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1129 const adns_rr_srvraw *rrp= datap;
1130 adns_status st;
1131
1132 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1133 return csp_domain(vb,rrp->host);
1134 }
1135
1136 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1137 const adns_rr_srvha *rrp= datap;
1138 adns_status st;
1139
1140 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1141 return csp_hostaddr(vb,&rrp->ha);
1142 }
1143
1144 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1145 const struct typeinfo *typei) {
1146 /* we treat everything in the array as if it were an adns_rr_srvha
1147 * even though the array might be of adns_rr_srvraw. That's OK
1148 * because they have the same prefix, which is all we access.
1149 * We use rrsz, too, rather than naive array indexing, of course.
1150 */
1151 char *workbegin, *workend, *search, *arrayend;
1152 const adns_rr_srvha *rr;
1153 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1154 int cpriority, totalweight, runtotal;
1155 long randval;
1156
1157 assert(rrsz <= sizeof(rrtmp));
1158 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1159 workbegin < arrayend;
1160 workbegin= workend) {
1161 cpriority= (rr=(void*)workbegin)->priority;
1162
1163 for (workend= workbegin, totalweight= 0;
1164 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1165 workend += rrsz) {
1166 totalweight += rr->weight;
1167 }
1168
1169 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1170 * cpriority. From now on, workbegin points to the `remaining'
1171 * records: we select one record at a time (RFC2782 `Usage rules'
1172 * and `Format of the SRV RR' subsection `Weight') to place at
1173 * workbegin (swapping with the one that was there, and then
1174 * advance workbegin. */
1175 for (;
1176 workbegin + rrsz < workend; /* don't bother if just one */
1177 workbegin += rrsz) {
1178
1179 randval= nrand48(ads->rand48xsubi);
1180 randval %= (totalweight + 1);
1181 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1182 * totalweight must be <= 2^26 so probability nonuniformity is
1183 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1184 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1185 */
1186
1187 for (search=workbegin, runtotal=0;
1188 (runtotal += (rr=(void*)search)->weight) < randval;
1189 search += rrsz);
1190 assert(search < arrayend);
1191 totalweight -= rr->weight;
1192 if (search != workbegin) {
1193 memcpy(&rrtmp, workbegin, rrsz);
1194 memcpy(workbegin, search, rrsz);
1195 memcpy(search, &rrtmp, rrsz);
1196 }
1197 }
1198 }
1199 /* tests:
1200 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1201 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1202 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1203 */
1204 }
1205
1206 /*
1207 * _byteblock (mf)
1208 */
1209
1210 static void mf_byteblock(adns_query qu, void *datap) {
1211 adns_rr_byteblock *rrp= datap;
1212 void *bytes= rrp->data;
1213 adns__makefinal_block(qu,&bytes,rrp->len);
1214 rrp->data= bytes;
1215 }
1216
1217 /*
1218 * _opaque (pa,cs)
1219 */
1220
1221 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1222 int max, void *datap) {
1223 adns_rr_byteblock *rrp= datap;
1224
1225 rrp->len= max - cbyte;
1226 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1227 if (!rrp->data) R_NOMEM;
1228 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1229 return adns_s_ok;
1230 }
1231
1232 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1233 const adns_rr_byteblock *rrp= datap;
1234 char buf[10];
1235 int l;
1236 unsigned char *p;
1237
1238 sprintf(buf,"\\# %d",rrp->len);
1239 CSP_ADDSTR(buf);
1240
1241 for (l= rrp->len, p= rrp->data;
1242 l>=4;
1243 l -= 4, p += 4) {
1244 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1245 CSP_ADDSTR(buf);
1246 }
1247 for (;
1248 l>0;
1249 l--, p++) {
1250 sprintf(buf," %02x",*p);
1251 CSP_ADDSTR(buf);
1252 }
1253 return adns_s_ok;
1254 }
1255
1256 /*
1257 * _flat (mf)
1258 */
1259
1260 static void mf_flat(adns_query qu, void *data) { }
1261
1262 /*
1263 * Now the table.
1264 */
1265
1266 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1267
1268 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1269 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1270 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1271 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1272 CDR(__VA_ARGS__) }
1273 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1274 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1275 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1276 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1277 CDR(__VA_ARGS__) }
1278
1279 #define di_0 0
1280
1281 static const typeinfo typeinfos[] = {
1282 /* Must be in ascending order of rrtype ! */
1283 /* mem-mgmt code rrt fmt member parser comparer printer */
1284
1285 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1286 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1287 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1288 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1289 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1290 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1291 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1292 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1293 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1294 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, in6addr, in6addr,in6addr ),
1295 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1296 .checklabel= ckl_srv, .postsort= postsort_srv),
1297
1298 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1299 .getrrsz= gsz_addr),
1300 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1301 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1302 .checklabel= ckl_ptr),
1303 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1304 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1305 .checklabel= ckl_srv, .postsort= postsort_srv),
1306
1307 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1308 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1309 };
1310
1311 static const typeinfo typeinfo_unknown=
1312 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1313
1314 const typeinfo *adns__findtype(adns_rrtype type) {
1315 const typeinfo *begin, *end, *mid;
1316
1317 if (type & adns_r_unknown) return &typeinfo_unknown;
1318 type &= adns_rrt_reprmask;
1319
1320 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1321
1322 while (begin < end) {
1323 mid= begin + ((end-begin)>>1);
1324 if (mid->typekey == type) return mid;
1325 if (type > mid->typekey) begin= mid+1;
1326 else end= mid;
1327 }
1328 return 0;
1329 }
GNU ADNS, an asynchronous DNS stub resolver -- local hacking