3 * - RR-type-specific code, and the machinery to call it
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.)
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)
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.
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.
30 #include <sys/types.h>
31 #include <sys/socket.h>
32 #include <netinet/in.h>
33 #include <arpa/inet.h>
38 #define R_NOMEM return adns_s_nomemory
39 #define CSP_ADDSTR(s) do { \
40 if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
47 * _textdata, _qstring (csp)
52 * _inaddr (pa,cs,di, +search_sortlist, dip_genaddr)
54 * _addr (pap,pa,di,csp,cs,qs, +search_sortlist_sa,
55 * dip_sockaddr, rrtypes)
58 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs)
61 * _inthostaddr (mf,cs)
66 * _mailbox (pap +pap_mailbox822)
69 * _srv* (qdpl,(pap),pa,mf,di,(csp),cs,postsort)
74 * within each section:
91 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
92 int *len_r, char **str_r) {
93 /* Neither len_r nor str_r may be null.
94 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
96 const byte *dgram= pai->dgram;
102 if (cbyte >= max) return adns_s_invaliddata;
104 if (cbyte+l > max) return adns_s_invaliddata;
106 str= adns__alloc_interim(pai->qu, l+1);
110 memcpy(str,dgram+cbyte,l);
119 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
125 for (cn=0; cn<len; cn++) {
129 } else if (ch == '"') {
131 } else if (ch >= 32 && ch <= 126) {
132 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
134 sprintf(buf,"\\x%02x",ch);
147 static void mf_str(adns_query qu, void *datap) {
150 adns__makefinal_str(qu,rrp);
157 static void mf_intstr(adns_query qu, void *datap) {
158 adns_rr_intstr *rrp= datap;
160 adns__makefinal_str(qu,&rrp->str);
167 static void mf_manyistr(adns_query qu, void *datap) {
168 adns_rr_intstr **rrp= datap;
169 adns_rr_intstr *te, *table;
173 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
175 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
177 for (te= *rrp; te->i >= 0; te++)
178 adns__makefinal_str(qu,&te->str);
185 static adns_status pa_txt(const parseinfo *pai, int cbyte,
186 int max, void *datap) {
187 adns_rr_intstr **rrp= datap, *table, *te;
188 const byte *dgram= pai->dgram;
189 int ti, tc, l, startbyte;
193 if (cbyte >= max) return adns_s_invaliddata;
195 while (cbyte < max) {
200 if (cbyte != max || !tc) return adns_s_invaliddata;
202 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
205 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
206 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
209 assert(cbyte == max);
218 static adns_status cs_txt(vbuf *vb, const void *datap) {
219 const adns_rr_intstr *const *rrp= datap;
220 const adns_rr_intstr *current;
224 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
225 if (spc) CSP_ADDSTR(" ");
226 st= csp_qstring(vb,current->str,current->i); if (st) return st;
235 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
236 const adns_rr_intstrpair *rrp= datap;
239 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
241 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
246 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr)
249 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
250 int max, void *datap) {
251 struct in_addr *storeto= datap;
253 if (max-cbyte != 4) return adns_s_invaliddata;
254 memcpy(storeto, pai->dgram + cbyte, 4);
258 static int search_sortlist(adns_state ads, int af, const void *ad) {
259 const struct sortlist *slp;
260 const struct in6_addr *a6;
265 if (af == AF_INET6) {
267 if (IN6_IS_ADDR_V4MAPPED(a6)) {
268 a.v4.s_addr = htonl(((unsigned long)a6->s6_addr[12] << 24) |
269 ((unsigned long)a6->s6_addr[13] << 16) |
270 ((unsigned long)a6->s6_addr[14] << 8) |
271 ((unsigned long)a6->s6_addr[15] << 0));
276 for (i=0, slp=ads->sortlist;
278 !(af == slp->ai->af &&
279 slp->ai->matchp(ad, &slp->base, &slp->mask)) &&
280 !(v6mappedp && slp->ai->af == AF_INET &&
281 slp->ai->matchp(&a, &slp->base, &slp->mask));
286 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
289 if (!ads->nsortlist) return 0;
291 ai= search_sortlist(ads,af,a);
292 bi= search_sortlist(ads,af,b);
296 static int di_inaddr(adns_state ads,
297 const void *datap_a, const void *datap_b) {
298 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
301 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
302 const struct in_addr *rrp= datap, rr= *rrp;
305 ia= inet_ntoa(rr); assert(ia);
311 * _in6addr (pa,di,cs)
314 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
315 int max, void *datap) {
316 struct in6_addr *storeto= datap;
318 if (max-cbyte != 16) return adns_s_invaliddata;
319 memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
323 static int di_in6addr(adns_state ads,
324 const void *datap_a, const void *datap_b) {
325 return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
328 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
329 char buf[INET6_ADDRSTRLEN];
332 ia= inet_ntop(AF_INET6, datap, buf, sizeof(buf)); assert(ia);
338 * _addr (pap,pa,di,csp,cs,qs, +search_sortlist_sa, dip_sockaddr,
339 * addr_rrtypes, addr_rrsz)
342 /* About CNAME handling in addr queries.
344 * A user-level addr query is translated into a number of protocol-level
345 * queries, and its job is to reassemble the results. This gets tricky if
346 * the answers aren't consistent. In particular, if the answers report
347 * inconsistent indirection via CNAME records (e.g., different CNAMEs, or
348 * some indirect via a CNAME, and some don't) then we have trouble.
350 * Once we've received an answer, even if it was NODATA, we set
351 * adns__qf_addr_answer on the parent query. This will let us detect a
352 * conflict between a no-CNAME-with-NODATA reply and a subsequent CNAME.
354 * If we detect a conflict of any kind, then at least one answer came back
355 * with a CNAME record, so we pick the first such answer (somewhat
356 * arbitrarily) as being the `right' canonical name, and set this in the
357 * parent query's answer->cname slot. We discard address records from the
358 * wrong name. And finally we cancel the outstanding child queries, and
359 * resubmit address queries for the address families we don't yet have, with
360 * adns__qf_addr_cname set so that we know that we're in the fixup state.
363 static adns_status pap_addr(const parseinfo *pai, int rrty, size_t rrsz,
364 int *cbyte_io, int max, adns_rr_addr *storeto)
366 const byte *dgram= pai->dgram;
367 int af, addrlen, salen;
368 struct in6_addr v6map;
369 const void *oaddr = dgram + *cbyte_io;
370 int avail = max - *cbyte_io;
376 if (pai->qu->flags & adns_qf_domapv4) {
377 if (avail < 4) return adns_s_invaliddata;
378 memset(v6map.s6_addr + 0, 0x00, 10);
379 memset(v6map.s6_addr + 10, 0xff, 2);
380 memcpy(v6map.s6_addr + 12, oaddr, 4);
381 oaddr = v6map.s6_addr; avail = sizeof(v6map.s6_addr);
382 if (step < 0) step = 4;
385 af = AF_INET; addrlen = 4;
386 addrp = &storeto->addr.inet.sin_addr;
387 salen = sizeof(storeto->addr.inet);
391 af = AF_INET6; addrlen = 16;
392 addrp = storeto->addr.inet6.sin6_addr.s6_addr;
393 salen = sizeof(storeto->addr.inet6);
398 assert(offsetof(adns_rr_addr, addr) + salen <= rrsz);
399 if (addrlen < avail) return adns_s_invaliddata;
400 if (step < 0) step = addrlen;
402 memset(&storeto->addr, 0, salen);
403 storeto->len = salen;
404 storeto->addr.sa.sa_family = af;
405 memcpy(addrp, oaddr, addrlen);
410 static adns_status pa_addr(const parseinfo *pai, int cbyte,
411 int max, void *datap) {
412 int err = pap_addr(pai, pai->qu->answer->type & adns_rrt_typemask,
413 pai->qu->answer->rrsz, &cbyte, max, datap);
415 if (cbyte != max) return adns_s_invaliddata;
419 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa)
421 const afinfo *ai = 0;
423 switch (sa->sa_family) {
424 case AF_INET: ai = &adns__inet_afinfo; break;
425 case AF_INET6: ai = &adns__inet6_afinfo; break;
429 return search_sortlist(ads, sa->sa_family, ai->sockaddr_to_inaddr(sa));
432 static int dip_sockaddr(adns_state ads,
433 const struct sockaddr *sa,
434 const struct sockaddr *sb)
436 if (!ads->sortlist) return 0;
437 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
440 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
441 const adns_rr_addr *ap= datap_a, *bp= datap_b;
443 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
446 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
447 const adns_state ads= context;
449 return di_addr(ads, datap_a, datap_b);
452 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
456 switch (rrp->addr.inet.sin_family) {
461 CSP_ADDSTR("INET6 ");
464 err= getnameinfo(&rrp->addr.sa, rrp->len, buf, sizeof(buf), 0, 0,
465 NI_NUMERICHOST); assert(!err);
469 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
476 static adns_status cs_addr(vbuf *vb, const void *datap) {
477 const adns_rr_addr *rrp= datap;
479 return csp_addr(vb,rrp);
482 #define ADDR_MAXRRTYPES 2
484 static void addr_rrtypes(adns_state ads, adns_rrtype type,
486 adns_rrtype *rrty, size_t *nrrty)
489 adns_rrtype qtf = type & adns__qtf_deref;
491 if (!(type & adns__qtf_bigaddr) || !(type & adns__qtf_manyaf))
492 qf = (qf & adns__qf_afmask) | adns_qf_ipv4_only;
494 if (qf & adns_qf_ipv4_only) rrty[n++] = adns_r_a | qtf;
495 if (qf & adns_qf_ipv6_only) rrty[n++] = adns_r_aaaa | qtf;
500 static size_t addr_rrsz(adns_query qu)
502 return qu->answer->type & adns__qtf_bigaddr ?
503 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
506 static adns_status append_addrs(adns_query qu, adns_query from, size_t rrsz,
507 adns_rr_addr **dp, int *dlen,
508 const adns_rr_addr *sp, int slen)
510 size_t drrsz = *dlen*rrsz, srrsz = slen*rrsz;
511 byte *p = adns__alloc_interim(qu, drrsz + srrsz);
514 memcpy(p, *dp, drrsz);
515 adns__free_interim(qu, *dp);
517 memcpy(p + drrsz, sp, srrsz);
519 *dp = (adns_rr_addr *)p;
520 if (from && qu->expires > from->expires) qu->expires = from->expires;
524 static void icb_addr(adns_query parent, adns_query child)
526 adns_state ads = parent->ads;
527 adns_answer *pans = parent->answer, *cans = child->answer;
528 struct timeval tvbuf;
530 const struct timeval *now = 0;
532 if (child->cname || parent->cname) {
535 if ((parent->flags & adns_qf_search) &&
536 cans->status == adns_s_nxdomain) {
537 if (parent->expires > child->expires) parent->expires = child->expires;
538 adns__cancel_children(parent);
539 adns__free_interim(parent, pans->rrs.bytes);
540 pans->rrs.bytes = 0; pans->nrrs = 0;
541 adns__must_gettimeofday(ads, &now, &tvbuf);
542 if (now) adns__search_next(ads, parent, *now);
546 if (cans->status && cans->status != adns_s_nodata) {
547 adns__query_fail(parent, cans->status);
551 assert(pans->rrsz == cans->rrsz);
552 err = append_addrs(parent, child, pans->rrsz,
553 &pans->rrs.addr, &pans->nrrs,
554 cans->rrs.addr, cans->nrrs);
555 if (err) { adns__query_fail(parent, err); return; }
557 if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
558 else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
559 else adns__query_done(parent);
562 static void addr_subqueries(adns_query qu, struct timeval now,
563 const adns_rrtype *rrty, size_t nrrty)
568 (qu->flags | adns__qf_senddirect) &
572 if (!(qu->answer->type & adns__qtf_bigaddr))
573 qu->answer->rrsz = sizeof(adns_rr_addr_v4only);
575 /* This always makes child queries, even if there's only the one. This
576 * seems wasteful, but there's only one case where it'd be safe -- namely
577 * IPv4-only -- and that's not the case I want to optimize.
579 memset(&ctx, 0, sizeof(ctx));
580 ctx.callback = icb_addr;
581 for (i = 0; i < nrrty; i++) {
582 err = adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qu->query_dgram,
583 qu->query_dglen, DNS_HDRSIZE, rrty[i], qf);
584 if (err) goto x_error;
585 err = adns__internal_submit(qu->ads, &cqu, qu->typei, rrty[i],
586 &qu->vb, id, qf, now, &ctx);
587 if (err) goto x_error;
588 cqu->answer->rrsz = qu->answer->rrsz;
590 LIST_LINK_TAIL_PART(qu->children, cqu,siblings.);
592 qu->state = query_childw;
593 LIST_LINK_TAIL(qu->ads->childw, qu);
597 adns__query_fail(qu, err);
600 static adns_status addr_submit(adns_query parent, adns_query *query_r,
601 vbuf *qumsg_vb, int id,
602 const adns_rrtype *rrty, size_t nrrty,
603 adns_queryflags flags, struct timeval now,
606 /* This is effectively a substitute for adns__internal_submit, intended for
607 * the case where the caller (possibly) only wants a subset of the
608 * available record types. The memory management and callback rules are
609 * the same as for adns__internal_submit.
611 * Some differences: the query is linked onto the parent's children list
612 * before exit (though the parent's state is not changed, and it is not
613 * linked into the childw list queue).
616 adns_state ads = parent->ads;
619 (adns_r_addr & adns_rrt_reprmask) |
620 (parent->answer->type & ~adns_rrt_reprmask);
622 err = adns__internal_submit(ads, query_r, adns__findtype(adns_r_addr),
623 type, qumsg_vb, id, flags | adns__qf_nosend,
627 (*query_r)->parent = parent;
628 LIST_LINK_TAIL_PART(parent->children, *query_r, siblings.);
629 addr_subqueries(*query_r, now, rrty, nrrty);
633 static void qs_addr(adns_query qu, struct timeval now)
635 adns_rrtype rrty[ADDR_MAXRRTYPES];
638 addr_rrtypes(qu->ads, qu->answer->type, qu->flags, rrty, &nrrty);
639 addr_subqueries(qu, now, rrty, nrrty);
643 * _domain (pap,csp,cs)
647 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
648 char **domain_r, parsedomain_flags flags) {
652 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
653 pai->dgram,pai->dglen, cbyte_io, max);
655 if (!pai->qu->vb.used) return adns_s_invaliddata;
657 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
660 dm[pai->qu->vb.used]= 0;
661 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
667 static adns_status csp_domain(vbuf *vb, const char *domain) {
669 if (!*domain) CSP_ADDSTR(".");
673 static adns_status cs_domain(vbuf *vb, const void *datap) {
674 const char *const *domainp= datap;
675 return csp_domain(vb,*domainp);
678 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
679 int max, void *datap) {
683 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
686 if (cbyte != max) return adns_s_invaliddata;
694 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
695 int max, void *datap) {
699 st= pap_domain(pai, &cbyte, max, rrp,
700 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
703 if (cbyte != max) return adns_s_invaliddata;
708 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs)
711 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
712 adns_rrtype *rrty, size_t *nrrty_io,
713 size_t addrsz, int *cbyte_io, int count,
716 int type, class, rdlen, rdend, rdstart, ownermatched;
717 size_t nrrty = *nrrty_io;
721 for (rri=0, naddrs=0; rri<count; rri++) {
722 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
723 pai->dglen, cbyte_io,
724 &type, &class, &ttl, &rdlen, &rdstart,
725 pai->dgram, pai->dglen, dmstart, &ownermatched);
727 if (!ownermatched || class != DNS_CLASS_IN) continue;
728 for (j = 0; j < nrrty && type != (rrty[j] & adns_rrt_typemask); j++);
729 if (j >= nrrty) continue;
732 adns_rrtype t = rrty[j];
733 rrty[j] = rrty[*nrrty_io];
736 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) R_NOMEM;
737 adns__update_expires(pai->qu,ttl,pai->now);
738 rdend = rdstart + rdlen;
739 st= pap_addr(pai, type, addrsz, &rdstart, rdend,
740 (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
742 if (rdstart != rdend) return adns_s_invaliddata;
746 st = append_addrs(pai->qu, 0, addrsz, &ha->addrs, &ha->naddrs,
747 (const adns_rr_addr *)pai->qu->vb.buf, naddrs);
749 ha->astatus= adns_s_ok;
752 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
759 static void icb_hostaddr(adns_query parent, adns_query child) {
760 adns_answer *cans= child->answer;
761 adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
762 adns_state ads= parent->ads;
764 size_t addrsz = addr_rrsz(parent);
766 st= cans->status == adns_s_nodata ? adns_s_ok : cans->status;
770 assert(addrsz == cans->rrsz);
771 st = append_addrs(parent, child, addrsz,
772 &rrp->addrs, &rrp->naddrs,
773 cans->rrs.addr, cans->nrrs);
775 if (!rrp->naddrs) { st = adns_s_nodata; goto done; }
777 if (!adns__vbuf_ensure(&parent->vb, addrsz))
778 { st = adns_s_nomemory; goto done; }
779 adns__isort(rrp->addrs, rrp->naddrs, addrsz, parent->vb.buf,
784 adns__free_interim(parent, rrp->addrs);
785 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
788 if (parent->children.head) {
789 LIST_LINK_TAIL(ads->childw,parent);
791 adns__query_done(parent);
795 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
796 int max, adns_rr_hostaddr *rrp) {
802 adns_queryflags nflags;
803 adns_rrtype rrty[ADDR_MAXRRTYPES];
805 size_t addrsz = addr_rrsz(pai->qu);
807 dmstart= cbyte= *cbyte_io;
808 st= pap_domain(pai, &cbyte, max, &rrp->host,
809 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
813 rrp->astatus= adns_s_ok;
819 addr_rrtypes(pai->ads, pai->qu->answer->type,
820 pai->qu->flags, rrty, &nrrty);
822 st= pap_findaddrs(pai, rrp, rrty, &nrrty, addrsz,
823 &cbyte, pai->nscount, dmstart);
825 if (!nrrty) return adns_s_ok;
827 st= pap_findaddrs(pai, rrp, rrty, &nrrty, addrsz,
828 &cbyte, pai->arcount, dmstart);
830 if (!nrrty) return adns_s_ok;
832 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
833 pai->dgram, pai->dglen, dmstart,
834 adns_r_addr, adns_qf_quoteok_query);
838 ctx.callback= icb_hostaddr;
839 ctx.info.hostaddr= rrp;
841 nflags= adns_qf_quoteok_query | (pai->qu->flags & adns__qf_afmask);
842 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
844 st= addr_submit(pai->qu, &nqu, &pai->qu->vb, id, rrty, nrrty,
845 nflags, pai->now, &ctx);
851 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
852 int max, void *datap) {
853 adns_rr_hostaddr *rrp= datap;
856 st= pap_hostaddr(pai, &cbyte, max, rrp);
858 if (cbyte != max) return adns_s_invaliddata;
863 static int dip_hostaddr(adns_state ads,
864 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
865 if (ap->astatus != bp->astatus) return ap->astatus;
866 if (ap->astatus) return 0;
868 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
871 static int di_hostaddr(adns_state ads,
872 const void *datap_a, const void *datap_b) {
873 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
875 return dip_hostaddr(ads, ap,bp);
878 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
880 size_t sz = qu->answer->type & adns__qtf_bigaddr ?
881 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
882 adns__makefinal_str(qu,&rrp->host);
884 adns__makefinal_block(qu, &tablev, rrp->naddrs*sz);
888 static void mf_hostaddr(adns_query qu, void *datap) {
889 adns_rr_hostaddr *rrp= datap;
891 mfp_hostaddr(qu,rrp);
894 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
900 st= csp_domain(vb,rrp->host); if (st) return st;
903 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
905 sprintf(buf," %d ",rrp->astatus);
908 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
911 errstr= adns_strerror(rrp->astatus);
912 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
914 if (rrp->naddrs >= 0) {
916 for (i=0; i<rrp->naddrs; i++) {
918 st= csp_addr(vb,&rrp->addrs[i]);
927 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
928 const adns_rr_hostaddr *rrp= datap;
930 return csp_hostaddr(vb,rrp);
937 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
938 int max, void *datap) {
939 const byte *dgram= pai->dgram;
940 adns_rr_intstr *rrp= datap;
944 if (cbyte+2 > max) return adns_s_invaliddata;
947 st= pap_domain(pai, &cbyte, max, &rrp->str,
948 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
951 if (cbyte != max) return adns_s_invaliddata;
955 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
956 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
958 if (ap->i < bp->i) return 0;
959 if (ap->i > bp->i) return 1;
967 static adns_status pa_mx(const parseinfo *pai, int cbyte,
968 int max, void *datap) {
969 const byte *dgram= pai->dgram;
970 adns_rr_inthostaddr *rrp= datap;
974 if (cbyte+2 > max) return adns_s_invaliddata;
977 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
980 if (cbyte != max) return adns_s_invaliddata;
984 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
985 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
987 if (ap->i < bp->i) return 0;
988 if (ap->i > bp->i) return 1;
989 return dip_hostaddr(ads, &ap->ha, &bp->ha);
993 * _inthostaddr (mf,cs)
996 static void mf_inthostaddr(adns_query qu, void *datap) {
997 adns_rr_inthostaddr *rrp= datap;
999 mfp_hostaddr(qu,&rrp->ha);
1002 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
1003 const adns_rr_inthostaddr *rrp= datap;
1006 sprintf(buf,"%u ",rrp->i);
1009 return csp_hostaddr(vb,&rrp->ha);
1016 static adns_status cs_inthost(vbuf *vb, const void *datap) {
1017 const adns_rr_intstr *rrp= datap;
1020 sprintf(buf,"%u ",rrp->i);
1022 return csp_domain(vb,rrp->str);
1026 * _ptr (pa, +icb_ptr)
1029 static void icb_ptr(adns_query parent, adns_query child) {
1030 adns_answer *cans= child->answer;
1031 const union gen_addr *queried;
1032 const unsigned char *found;
1033 adns_state ads= parent->ads;
1036 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1037 adns__query_fail(parent,adns_s_inconsistent);
1039 } else if (cans->status) {
1040 adns__query_fail(parent,cans->status);
1044 queried= &parent->ctx.info.ptr_parent_addr.addr;
1045 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found += cans->rrsz) {
1046 if (!memcmp(queried,found,cans->rrsz)) {
1047 if (!parent->children.head) {
1048 adns__query_done(parent);
1051 LIST_LINK_TAIL(ads->childw,parent);
1057 adns__query_fail(parent,adns_s_inconsistent);
1060 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1061 int max, void *datap) {
1062 static const struct {
1064 const char *const tail[3];
1065 } expectdomain[] = {
1066 { &adns__inet_afinfo, { DNS_INADDR_ARPA, 0 } },
1067 { &adns__inet6_afinfo, { DNS_IP6_ARPA, 0 } }
1069 enum { n_ed = sizeof(expectdomain)/sizeof(expectdomain[0]) };
1073 struct afinfo_addr *ap;
1074 findlabel_state fls;
1076 int cbyte, i, j, foundj = -1, lablen, labstart, id, f, ac;
1082 st= pap_domain(pai, &cbyte, max, rrp,
1083 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1085 if (cbyte != max) return adns_s_invaliddata;
1087 ap= &pai->qu->ctx.info.ptr_parent_addr;
1089 adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
1090 pai->qu->query_dgram, pai->qu->query_dglen,
1091 pai->qu->query_dglen, DNS_HDRSIZE, 0);
1093 f = (1 << n_ed) - 1; /* superposition of address types */
1095 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
1096 if (lablen <= 0) break;
1097 for (j = 0; j < n_ed; j++) {
1098 if (!(f & (1 << j))) continue;
1099 if (i < expectdomain[j].ai->nrevcomp) {
1100 ac = expectdomain[j].ai->rev_parsecomp(
1101 pai->qu->query_dgram + labstart, lablen);
1102 if (ac < 0) goto mismatch;
1103 assert(i < sizeof(ipv[j]));
1106 tp = expectdomain[j].tail[i - expectdomain[j].ai->nrevcomp];
1108 strncmp(pai->qu->query_dgram + labstart, tp, lablen) != 0 ||
1116 if (!f) return adns_s_querydomainwrong;
1120 if (lablen < 0) return adns_s_querydomainwrong;
1121 for (j = 0; j < n_ed; j++) {
1122 if (!(f & (1 << j))) continue;
1123 if (i >= expectdomain[j].ai->nrevcomp &&
1124 !expectdomain[j].tail[i - expectdomain[j].ai->nrevcomp])
1125 { foundj = j; continue; }
1127 if (!f) return adns_s_querydomainwrong;
1129 assert(foundj >= 0 && f == (1 << foundj)); /* collapsed to a single type */
1131 ap->ai = expectdomain[foundj].ai;
1132 ap->ai->rev_mkaddr(&ap->addr, ipv[foundj]);
1135 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1136 pai->dgram, pai->dglen, dmstart,
1137 ap->ai->rrtype, adns_qf_quoteok_query);
1141 ctx.callback= icb_ptr;
1142 memset(&ctx.info,0,sizeof(ctx.info));
1143 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(ap->ai->rrtype),
1144 ap->ai->rrtype, &pai->qu->vb, id,
1145 adns_qf_quoteok_query, pai->now, &ctx);
1148 nqu->parent= pai->qu;
1149 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
1157 static void mf_strpair(adns_query qu, void *datap) {
1158 adns_rr_strpair *rrp= datap;
1160 adns__makefinal_str(qu,&rrp->array[0]);
1161 adns__makefinal_str(qu,&rrp->array[1]);
1168 static void mf_intstrpair(adns_query qu, void *datap) {
1169 adns_rr_intstrpair *rrp= datap;
1171 adns__makefinal_str(qu,&rrp->array[0].str);
1172 adns__makefinal_str(qu,&rrp->array[1].str);
1179 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1180 int max, void *datap) {
1181 adns_rr_intstrpair *rrp= datap;
1185 for (i=0; i<2; i++) {
1186 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1190 if (cbyte != max) return adns_s_invaliddata;
1199 static adns_status pap_mailbox822(const parseinfo *pai,
1200 int *cbyte_io, int max, char **mb_r) {
1201 int lablen, labstart, i, needquote, c, r, neednorm;
1202 const unsigned char *p;
1204 findlabel_state fls;
1210 adns__findlabel_start(&fls, pai->ads,
1212 pai->dgram, pai->dglen, max,
1213 *cbyte_io, cbyte_io);
1214 st= adns__findlabel_next(&fls,&lablen,&labstart);
1216 adns__vbuf_appendstr(vb,".");
1221 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1223 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1224 if (c == '.' && !neednorm) neednorm= 1;
1225 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1229 if (needquote || neednorm) {
1230 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1231 adns__vbuf_appendq(vb,"\"",1);
1232 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1234 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1235 adns__vbuf_appendq(vb,p,1);
1237 adns__vbuf_appendq(vb,"\"",1);
1239 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1242 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1244 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1248 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1249 memcpy(str,vb->buf,vb->used);
1255 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1257 if (pai->qu->typei->typekey & adns__qtf_mail822) {
1258 return pap_mailbox822(pai, cbyte_io, max, mb_r);
1260 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1264 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1265 return csp_domain(vb,mailbox);
1272 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1273 int max, void *datap) {
1274 adns_rr_strpair *rrp= datap;
1277 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1280 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1283 if (cbyte != max) return adns_s_invaliddata;
1287 static adns_status cs_rp(vbuf *vb, const void *datap) {
1288 const adns_rr_strpair *rrp= datap;
1291 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
1293 st= csp_domain(vb,rrp->array[1]); if (st) return st;
1302 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1303 int max, void *datap) {
1304 adns_rr_soa *rrp= datap;
1305 const byte *dgram= pai->dgram;
1309 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1310 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1313 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1316 if (cbyte+20 != max) return adns_s_invaliddata;
1318 for (i=0; i<5; i++) {
1321 (&rrp->serial)[i]= (msw<<16) | lsw;
1327 static void mf_soa(adns_query qu, void *datap) {
1328 adns_rr_soa *rrp= datap;
1330 adns__makefinal_str(qu,&rrp->mname);
1331 adns__makefinal_str(qu,&rrp->rname);
1334 static adns_status cs_soa(vbuf *vb, const void *datap) {
1335 const adns_rr_soa *rrp= datap;
1340 st= csp_domain(vb,rrp->mname); if (st) return st;
1342 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1344 for (i=0; i<5; i++) {
1345 sprintf(buf," %lu",(&rrp->serial)[i]);
1353 * _srv* (pa*2,di,cs*2,qdpl,postsort)
1356 static adns_status qdpl_srv(adns_state ads,
1357 const char **p_io, const char *pe, int labelnum,
1358 char label_r[DNS_MAXDOMAIN], int *ll_io,
1359 adns_queryflags flags,
1360 const typeinfo *typei) {
1365 if (labelnum < 2 && !(flags & adns_qf_quoteok_query)) {
1366 useflags= adns_qf_quoteok_query;
1372 st= adns__qdpl_normal(ads, p_io,pe, labelnum,label_r, ll_io, useflags,typei);
1377 if (!ll || label_r[0]!='_')
1378 return adns_s_querydomaininvalid;
1379 if (memchr(p_orig+1, '\\', pe - (p_orig+1)))
1380 return adns_s_querydomaininvalid;
1385 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1387 /* might be adns_rr_srvraw* */) {
1388 const byte *dgram= pai->dgram;
1392 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1394 rrp->priority= GET_W(cbyte, ti);
1395 rrp->weight= GET_W(cbyte, ti);
1396 rrp->port= GET_W(cbyte, ti);
1400 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1401 int max, void *datap) {
1402 adns_rr_srvraw *rrp= datap;
1405 st= pap_srv_begin(pai,&cbyte,max,datap);
1408 st= pap_domain(pai, &cbyte, max, &rrp->host,
1409 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1412 if (cbyte != max) return adns_s_invaliddata;
1416 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1417 int max, void *datap) {
1418 adns_rr_srvha *rrp= datap;
1421 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1422 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1423 if (cbyte != max) return adns_s_invaliddata;
1427 static void mf_srvraw(adns_query qu, void *datap) {
1428 adns_rr_srvraw *rrp= datap;
1429 adns__makefinal_str(qu, &rrp->host);
1432 static void mf_srvha(adns_query qu, void *datap) {
1433 adns_rr_srvha *rrp= datap;
1434 mfp_hostaddr(qu,&rrp->ha);
1437 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1438 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1439 /* might be const adns_rr_svhostaddr* */
1441 if (ap->priority < bp->priority) return 0;
1442 if (ap->priority > bp->priority) return 1;
1446 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1447 /* might be adns_rr_srvraw* */) {
1449 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1454 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1455 const adns_rr_srvraw *rrp= datap;
1458 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1459 return csp_domain(vb,rrp->host);
1462 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1463 const adns_rr_srvha *rrp= datap;
1466 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1467 return csp_hostaddr(vb,&rrp->ha);
1470 static void postsort_srv(adns_state ads, void *array, int nrrs,
1471 const struct typeinfo *typei) {
1472 /* we treat everything in the array as if it were an adns_rr_srvha
1473 * even though the array might be of adns_rr_srvraw. That's OK
1474 * because they have the same prefix, which is all we access.
1475 * We use typei->rrsz, too, rather than naive array indexing, of course.
1477 char *workbegin, *workend, *search, *arrayend;
1478 const adns_rr_srvha *rr;
1479 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1480 int cpriority, totalweight, runtotal;
1483 for (workbegin= array, arrayend= workbegin + typei->rrsz * nrrs;
1484 workbegin < arrayend;
1485 workbegin= workend) {
1486 cpriority= (rr=(void*)workbegin)->priority;
1488 for (workend= workbegin, totalweight= 0;
1489 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1490 workend += typei->rrsz) {
1491 totalweight += rr->weight;
1494 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1495 * cpriority. From now on, workbegin points to the `remaining'
1496 * records: we select one record at a time (RFC2782 `Usage rules'
1497 * and `Format of the SRV RR' subsection `Weight') to place at
1498 * workbegin (swapping with the one that was there, and then
1499 * advance workbegin. */
1501 workbegin + typei->rrsz < workend; /* don't bother if just one */
1502 workbegin += typei->rrsz) {
1504 randval= nrand48(ads->rand48xsubi);
1505 randval %= (totalweight + 1);
1506 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1507 * totalweight must be <= 2^26 so probability nonuniformity is
1508 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1509 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1512 for (search=workbegin, runtotal=0;
1513 (runtotal += (rr=(void*)search)->weight) < randval;
1514 search += typei->rrsz);
1515 assert(search < arrayend);
1516 totalweight -= rr->weight;
1517 if (search != workbegin) {
1518 memcpy(&rrtmp, workbegin, typei->rrsz);
1519 memcpy(workbegin, search, typei->rrsz);
1520 memcpy(search, &rrtmp, typei->rrsz);
1525 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1526 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1527 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1535 static void mf_byteblock(adns_query qu, void *datap) {
1536 adns_rr_byteblock *rrp= datap;
1537 void *bytes= rrp->data;
1538 adns__makefinal_block(qu,&bytes,rrp->len);
1546 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1547 int max, void *datap) {
1548 adns_rr_byteblock *rrp= datap;
1550 rrp->len= max - cbyte;
1551 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1552 if (!rrp->data) R_NOMEM;
1553 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1557 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1558 const adns_rr_byteblock *rrp= datap;
1563 sprintf(buf,"\\# %d",rrp->len);
1566 for (l= rrp->len, p= rrp->data;
1569 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1575 sprintf(buf," %02x",*p);
1585 static void mf_flat(adns_query qu, void *data) { }
1591 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1593 #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb
1594 #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb
1596 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1597 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), \
1598 mf_##memb, printer,parser,comparer, adns__qdpl_normal,0,0 }
1599 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1600 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), \
1601 mf_flat, printer,parser,comparer, adns__qdpl_normal,0,0 }
1602 #define XTRA_TYPE(code,rrt,fmt,memb,parser,comparer,printer, \
1603 makefinal,qdpl,postsort,sender) \
1604 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), makefinal, \
1605 printer,parser,comparer,qdpl,postsort,sender }
1607 static const typeinfo typeinfos[] = {
1608 /* Must be in ascending order of rrtype ! */
1609 /* mem-mgmt code rrt fmt member parser comparer printer */
1611 FLAT_TYPE(a, "A", 0, inaddr, pa_inaddr, di_inaddr,cs_inaddr ),
1612 DEEP_TYPE(ns_raw, "NS", "raw",str, pa_host_raw,0, cs_domain ),
1613 DEEP_TYPE(cname, "CNAME", 0, str, pa_dom_raw, 0, cs_domain ),
1614 DEEP_TYPE(soa_raw,"SOA", "raw",soa, pa_soa, 0, cs_soa ),
1615 DEEP_TYPE(ptr_raw,"PTR", "raw",str, pa_host_raw,0, cs_domain ),
1616 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,pa_hinfo, 0, cs_hinfo ),
1617 DEEP_TYPE(mx_raw, "MX", "raw",intstr, pa_mx_raw, di_mx_raw,cs_inthost ),
1618 DEEP_TYPE(txt, "TXT", 0, manyistr,pa_txt, 0, cs_txt ),
1619 DEEP_TYPE(rp_raw, "RP", "raw",strpair, pa_rp, 0, cs_rp ),
1620 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, pa_in6addr, di_in6addr,cs_in6addr ),
1621 XTRA_TYPE(srv_raw,"SRV", "raw",srvraw , pa_srvraw, di_srv, cs_srvraw,
1622 mf_srvraw, qdpl_srv, postsort_srv, 0),
1624 XTRA_TYPE(addr, "A", "addr", addr, pa_addr, di_addr, cs_addr,
1625 mf_flat, adns__qdpl_normal, 0, qs_addr),
1626 DEEP_TYPE(ns, "NS", "+addr",hostaddr,pa_hostaddr,di_hostaddr,cs_hostaddr ),
1627 DEEP_TYPE(ptr, "PTR","checked",str, pa_ptr, 0, cs_domain ),
1628 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,pa_mx, di_mx, cs_inthostaddr),
1629 XTRA_TYPE(srv, "SRV","+addr",srvha, pa_srvha, di_srv, cs_srvha,
1630 mf_srvha, qdpl_srv, postsort_srv, 0),
1632 DEEP_TYPE(soa, "SOA","822", soa, pa_soa, 0, cs_soa ),
1633 DEEP_TYPE(rp, "RP", "822", strpair, pa_rp, 0, cs_rp ),
1636 static const typeinfo typeinfo_unknown=
1637 DEEP_TYPE(unknown,0, "unknown",byteblock,pa_opaque, 0, cs_opaque );
1639 const typeinfo *adns__findtype(adns_rrtype type) {
1640 const typeinfo *begin, *end, *mid;
1642 if (type & adns_r_unknown) return &typeinfo_unknown;
1643 type &= adns_rrt_reprmask;
1645 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1647 while (begin < end) {
1648 mid= begin + ((end-begin)>>1);
1649 if (mid->typekey == type) return mid;
1650 if (type > mid->typekey) begin= mid+1;