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 static adns_status pap_addr(const parseinfo *pai, int rrty, size_t rrsz,
343 int *cbyte_io, int max, adns_rr_addr *storeto)
345 const byte *dgram= pai->dgram;
346 int af, addrlen, salen;
347 struct in6_addr v6map;
348 const void *oaddr = dgram + *cbyte_io;
349 int avail = max - *cbyte_io;
355 if (pai->qu->flags & adns_qf_domapv4) {
356 if (avail < 4) return adns_s_invaliddata;
357 memset(v6map.s6_addr + 0, 0x00, 10);
358 memset(v6map.s6_addr + 10, 0xff, 2);
359 memcpy(v6map.s6_addr + 12, oaddr, 4);
360 oaddr = v6map.s6_addr; avail = sizeof(v6map.s6_addr);
361 if (step < 0) step = 4;
364 af = AF_INET; addrlen = 4;
365 addrp = &storeto->addr.inet.sin_addr;
366 salen = sizeof(storeto->addr.inet);
370 af = AF_INET6; addrlen = 16;
371 addrp = storeto->addr.inet6.sin6_addr.s6_addr;
372 salen = sizeof(storeto->addr.inet6);
377 assert(offsetof(adns_rr_addr, addr) + salen <= rrsz);
378 if (addrlen < avail) return adns_s_invaliddata;
379 if (step < 0) step = addrlen;
381 memset(&storeto->addr, 0, salen);
382 storeto->len = salen;
383 storeto->addr.sa.sa_family = af;
384 memcpy(addrp, oaddr, addrlen);
389 static adns_status pa_addr(const parseinfo *pai, int cbyte,
390 int max, void *datap) {
391 int err = pap_addr(pai, pai->qu->answer->type & adns_rrt_typemask,
392 pai->qu->answer->rrsz, &cbyte, max, datap);
394 if (cbyte != max) return adns_s_invaliddata;
398 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa)
400 const afinfo *ai = 0;
402 switch (sa->sa_family) {
403 case AF_INET: ai = &adns__inet_afinfo; break;
404 case AF_INET6: ai = &adns__inet6_afinfo; break;
408 return search_sortlist(ads, sa->sa_family, ai->sockaddr_to_inaddr(sa));
411 static int dip_sockaddr(adns_state ads,
412 const struct sockaddr *sa,
413 const struct sockaddr *sb)
415 if (!ads->sortlist) return 0;
416 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
419 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
420 const adns_rr_addr *ap= datap_a, *bp= datap_b;
422 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
425 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
426 const adns_state ads= context;
428 return di_addr(ads, datap_a, datap_b);
431 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
435 switch (rrp->addr.inet.sin_family) {
440 CSP_ADDSTR("INET6 ");
443 err= getnameinfo(&rrp->addr.sa, rrp->len, buf, sizeof(buf), 0, 0,
444 NI_NUMERICHOST); assert(!err);
448 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
455 static adns_status cs_addr(vbuf *vb, const void *datap) {
456 const adns_rr_addr *rrp= datap;
458 return csp_addr(vb,rrp);
461 #define ADDR_MAXRRTYPES 2
463 static void addr_rrtypes(adns_state ads, adns_rrtype type,
465 adns_rrtype *rrty, size_t *nrrty)
468 adns_rrtype qtf = type & adns__qtf_deref;
470 if (!(type & adns__qtf_bigaddr) || !(type & adns__qtf_manyaf))
471 qf = (qf & adns__qf_afmask) | adns_qf_ipv4_only;
473 if (qf & adns_qf_ipv4_only) rrty[n++] = adns_r_a | qtf;
474 if (qf & adns_qf_ipv6_only) rrty[n++] = adns_r_aaaa | qtf;
479 static size_t addr_rrsz(adns_query qu)
481 return qu->answer->type & adns__qtf_bigaddr ?
482 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
485 static adns_status append_addrs(adns_query qu, size_t rrsz,
486 adns_rr_addr **dp, int *dlen,
487 const adns_rr_addr *sp, int slen)
489 size_t drrsz = *dlen*rrsz, srrsz = slen*rrsz;
490 byte *p = adns__alloc_interim(qu, drrsz + srrsz);
493 memcpy(p, *dp, drrsz);
494 adns__free_interim(qu, *dp);
496 memcpy(p + drrsz, sp, srrsz);
498 *dp = (adns_rr_addr *)p;
502 static void icb_addr(adns_query parent, adns_query child)
504 adns_state ads = parent->ads;
505 adns_answer *pans = parent->answer, *cans = child->answer;
506 struct timeval tvbuf;
508 const struct timeval *now = 0;
510 /* Must handle CNAMEs correctly. This gets very hairy if the answers we
511 * get are inconsistent.
514 if ((parent->flags & adns_qf_search) &&
515 cans->status == adns_s_nxdomain) {
516 if (parent->expires > child->expires) parent->expires = child->expires;
517 adns__cancel_children(parent);
518 adns__free_interim(parent, pans->rrs.bytes);
519 pans->rrs.bytes = 0; pans->nrrs = 0;
520 adns__must_gettimeofday(ads, &now, &tvbuf);
521 if (now) adns__search_next(ads, parent, *now);
525 if (cans->status && cans->status != adns_s_nodata) {
526 adns__query_fail(parent, cans->status);
530 assert(pans->rrsz == cans->rrsz);
531 err = append_addrs(parent, pans->rrsz,
532 &pans->rrs.addr, &pans->nrrs,
533 cans->rrs.addr, cans->nrrs);
534 if (err) { adns__query_fail(parent, err); return; }
536 if (parent->expires > child->expires) parent->expires = child->expires;
538 if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
539 else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
540 else adns__query_done(parent);
543 static void addr_subqueries(adns_query qu, struct timeval now,
544 const adns_rrtype *rrty, size_t nrrty)
549 (qu->flags | adns__qf_senddirect) &
553 if (!(qu->answer->type & adns__qtf_bigaddr))
554 qu->answer->rrsz = sizeof(adns_rr_addr_v4only);
556 /* This always makes child queries, even if there's only the one. This
557 * seems wasteful, but there's only one case where it'd be safe -- namely
558 * IPv4-only -- and that's not the case I want to optimize.
560 memset(&ctx, 0, sizeof(ctx));
561 ctx.callback = icb_addr;
562 for (i = 0; i < nrrty; i++) {
563 err = adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qu->query_dgram,
564 qu->query_dglen, DNS_HDRSIZE, rrty[i], qf);
565 if (err) goto x_error;
566 err = adns__internal_submit(qu->ads, &cqu, qu->typei, rrty[i],
567 &qu->vb, id, qf, now, &ctx);
568 if (err) goto x_error;
569 cqu->answer->rrsz = qu->answer->rrsz;
571 LIST_LINK_TAIL_PART(qu->children, cqu,siblings.);
573 qu->state = query_childw;
574 LIST_LINK_TAIL(qu->ads->childw, qu);
578 adns__query_fail(qu, err);
581 static adns_status addr_submit(adns_query parent, adns_query *query_r,
582 vbuf *qumsg_vb, int id,
583 const adns_rrtype *rrty, size_t nrrty,
584 adns_queryflags flags, struct timeval now,
587 /* This is effectively a substitute for adns__internal_submit, intended for
588 * the case where the caller (possibly) only wants a subset of the
589 * available record types. The memory management and callback rules are
590 * the same as for adns__internal_submit.
592 * Some differences: the query is linked onto the parent's children list
593 * before exit (though the parent's state is not changed, and it is not
594 * linked into the childw list queue).
597 adns_state ads = parent->ads;
600 (adns_r_addr & adns_rrt_reprmask) |
601 (parent->answer->type & ~adns_rrt_reprmask);
603 err = adns__internal_submit(ads, query_r, adns__findtype(adns_r_addr),
604 type, qumsg_vb, id, flags | adns__qf_nosend,
608 (*query_r)->parent = parent;
609 LIST_LINK_TAIL_PART(parent->children, *query_r, siblings.);
610 addr_subqueries(*query_r, now, rrty, nrrty);
614 static void qs_addr(adns_query qu, struct timeval now)
616 adns_rrtype rrty[ADDR_MAXRRTYPES];
619 addr_rrtypes(qu->ads, qu->answer->type, qu->flags, rrty, &nrrty);
620 addr_subqueries(qu, now, rrty, nrrty);
624 * _domain (pap,csp,cs)
628 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
629 char **domain_r, parsedomain_flags flags) {
633 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
634 pai->dgram,pai->dglen, cbyte_io, max);
636 if (!pai->qu->vb.used) return adns_s_invaliddata;
638 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
641 dm[pai->qu->vb.used]= 0;
642 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
648 static adns_status csp_domain(vbuf *vb, const char *domain) {
650 if (!*domain) CSP_ADDSTR(".");
654 static adns_status cs_domain(vbuf *vb, const void *datap) {
655 const char *const *domainp= datap;
656 return csp_domain(vb,*domainp);
659 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
660 int max, void *datap) {
664 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
667 if (cbyte != max) return adns_s_invaliddata;
675 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
676 int max, void *datap) {
680 st= pap_domain(pai, &cbyte, max, rrp,
681 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
684 if (cbyte != max) return adns_s_invaliddata;
689 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs)
692 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
693 adns_rrtype *rrty, size_t *nrrty_io,
694 size_t addrsz, int *cbyte_io, int count,
697 int type, class, rdlen, rdend, rdstart, ownermatched;
698 size_t nrrty = *nrrty_io;
702 for (rri=0, naddrs=0; rri<count; rri++) {
703 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
704 pai->dglen, cbyte_io,
705 &type, &class, &ttl, &rdlen, &rdstart,
706 pai->dgram, pai->dglen, dmstart, &ownermatched);
708 if (!ownermatched || class != DNS_CLASS_IN) continue;
709 for (j = 0; j < nrrty && type != (rrty[j] & adns_rrt_typemask); j++);
710 if (j >= nrrty) continue;
713 adns_rrtype t = rrty[j];
714 rrty[j] = rrty[*nrrty_io];
717 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) R_NOMEM;
718 adns__update_expires(pai->qu,ttl,pai->now);
719 rdend = rdstart + rdlen;
720 st= pap_addr(pai, type, addrsz, &rdstart, rdend,
721 (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
723 if (rdstart != rdend) return adns_s_invaliddata;
727 st = append_addrs(pai->qu, addrsz, &ha->addrs, &ha->naddrs,
728 (const adns_rr_addr *)pai->qu->vb.buf, naddrs);
730 ha->astatus= adns_s_ok;
733 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
740 static void icb_hostaddr(adns_query parent, adns_query child) {
741 adns_answer *cans= child->answer;
742 adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
743 adns_state ads= parent->ads;
745 size_t addrsz = addr_rrsz(parent);
747 st= cans->status == adns_s_nodata ? adns_s_ok : cans->status;
751 assert(addrsz == cans->rrsz);
752 if (parent->expires > child->expires) parent->expires = child->expires;
753 st = append_addrs(parent, addrsz,
754 &rrp->addrs, &rrp->naddrs,
755 cans->rrs.addr, cans->nrrs);
757 if (!rrp->naddrs) { st = adns_s_nodata; goto done; }
759 if (!adns__vbuf_ensure(&parent->vb, addrsz))
760 { st = adns_s_nomemory; goto done; }
761 adns__isort(rrp->addrs, rrp->naddrs, addrsz, parent->vb.buf,
766 adns__free_interim(parent, rrp->addrs);
767 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
770 if (parent->children.head) {
771 LIST_LINK_TAIL(ads->childw,parent);
773 adns__query_done(parent);
777 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
778 int max, adns_rr_hostaddr *rrp) {
784 adns_queryflags nflags;
785 adns_rrtype rrty[ADDR_MAXRRTYPES];
787 size_t addrsz = addr_rrsz(pai->qu);
789 dmstart= cbyte= *cbyte_io;
790 st= pap_domain(pai, &cbyte, max, &rrp->host,
791 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
795 rrp->astatus= adns_s_ok;
801 addr_rrtypes(pai->ads, pai->qu->answer->type,
802 pai->qu->flags, rrty, &nrrty);
804 st= pap_findaddrs(pai, rrp, rrty, &nrrty, addrsz,
805 &cbyte, pai->nscount, dmstart);
807 if (!nrrty) return adns_s_ok;
809 st= pap_findaddrs(pai, rrp, rrty, &nrrty, addrsz,
810 &cbyte, pai->arcount, dmstart);
812 if (!nrrty) return adns_s_ok;
814 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
815 pai->dgram, pai->dglen, dmstart,
816 adns_r_addr, adns_qf_quoteok_query);
820 ctx.callback= icb_hostaddr;
821 ctx.info.hostaddr= rrp;
823 nflags= adns_qf_quoteok_query | (pai->qu->flags & adns__qf_afmask);
824 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
826 st= addr_submit(pai->qu, &nqu, &pai->qu->vb, id, rrty, nrrty,
827 nflags, pai->now, &ctx);
833 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
834 int max, void *datap) {
835 adns_rr_hostaddr *rrp= datap;
838 st= pap_hostaddr(pai, &cbyte, max, rrp);
840 if (cbyte != max) return adns_s_invaliddata;
845 static int dip_hostaddr(adns_state ads,
846 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
847 if (ap->astatus != bp->astatus) return ap->astatus;
848 if (ap->astatus) return 0;
850 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
853 static int di_hostaddr(adns_state ads,
854 const void *datap_a, const void *datap_b) {
855 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
857 return dip_hostaddr(ads, ap,bp);
860 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
862 size_t sz = qu->answer->type & adns__qtf_bigaddr ?
863 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
864 adns__makefinal_str(qu,&rrp->host);
866 adns__makefinal_block(qu, &tablev, rrp->naddrs*sz);
870 static void mf_hostaddr(adns_query qu, void *datap) {
871 adns_rr_hostaddr *rrp= datap;
873 mfp_hostaddr(qu,rrp);
876 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
882 st= csp_domain(vb,rrp->host); if (st) return st;
885 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
887 sprintf(buf," %d ",rrp->astatus);
890 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
893 errstr= adns_strerror(rrp->astatus);
894 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
896 if (rrp->naddrs >= 0) {
898 for (i=0; i<rrp->naddrs; i++) {
900 st= csp_addr(vb,&rrp->addrs[i]);
909 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
910 const adns_rr_hostaddr *rrp= datap;
912 return csp_hostaddr(vb,rrp);
919 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
920 int max, void *datap) {
921 const byte *dgram= pai->dgram;
922 adns_rr_intstr *rrp= datap;
926 if (cbyte+2 > max) return adns_s_invaliddata;
929 st= pap_domain(pai, &cbyte, max, &rrp->str,
930 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
933 if (cbyte != max) return adns_s_invaliddata;
937 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
938 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
940 if (ap->i < bp->i) return 0;
941 if (ap->i > bp->i) return 1;
949 static adns_status pa_mx(const parseinfo *pai, int cbyte,
950 int max, void *datap) {
951 const byte *dgram= pai->dgram;
952 adns_rr_inthostaddr *rrp= datap;
956 if (cbyte+2 > max) return adns_s_invaliddata;
959 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
962 if (cbyte != max) return adns_s_invaliddata;
966 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
967 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
969 if (ap->i < bp->i) return 0;
970 if (ap->i > bp->i) return 1;
971 return dip_hostaddr(ads, &ap->ha, &bp->ha);
975 * _inthostaddr (mf,cs)
978 static void mf_inthostaddr(adns_query qu, void *datap) {
979 adns_rr_inthostaddr *rrp= datap;
981 mfp_hostaddr(qu,&rrp->ha);
984 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
985 const adns_rr_inthostaddr *rrp= datap;
988 sprintf(buf,"%u ",rrp->i);
991 return csp_hostaddr(vb,&rrp->ha);
998 static adns_status cs_inthost(vbuf *vb, const void *datap) {
999 const adns_rr_intstr *rrp= datap;
1002 sprintf(buf,"%u ",rrp->i);
1004 return csp_domain(vb,rrp->str);
1008 * _ptr (pa, +icb_ptr)
1011 static void icb_ptr(adns_query parent, adns_query child) {
1012 adns_answer *cans= child->answer;
1013 const union gen_addr *queried;
1014 const unsigned char *found;
1015 adns_state ads= parent->ads;
1018 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1019 adns__query_fail(parent,adns_s_inconsistent);
1021 } else if (cans->status) {
1022 adns__query_fail(parent,cans->status);
1026 queried= &parent->ctx.info.ptr_parent_addr.addr;
1027 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found += cans->rrsz) {
1028 if (!memcmp(queried,found,cans->rrsz)) {
1029 if (!parent->children.head) {
1030 adns__query_done(parent);
1033 LIST_LINK_TAIL(ads->childw,parent);
1039 adns__query_fail(parent,adns_s_inconsistent);
1042 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1043 int max, void *datap) {
1044 static const struct {
1046 const char *const tail[3];
1047 } expectdomain[] = {
1048 { &adns__inet_afinfo, { DNS_INADDR_ARPA, 0 } },
1049 { &adns__inet6_afinfo, { DNS_IP6_ARPA, 0 } }
1051 enum { n_ed = sizeof(expectdomain)/sizeof(expectdomain[0]) };
1055 struct afinfo_addr *ap;
1056 findlabel_state fls;
1058 int cbyte, i, j, foundj = -1, lablen, labstart, id, f, ac;
1064 st= pap_domain(pai, &cbyte, max, rrp,
1065 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1067 if (cbyte != max) return adns_s_invaliddata;
1069 ap= &pai->qu->ctx.info.ptr_parent_addr;
1071 adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
1072 pai->qu->query_dgram, pai->qu->query_dglen,
1073 pai->qu->query_dglen, DNS_HDRSIZE, 0);
1075 f = (1 << n_ed) - 1; /* superposition of address types */
1077 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
1078 if (lablen <= 0) break;
1079 for (j = 0; j < n_ed; j++) {
1080 if (!(f & (1 << j))) continue;
1081 if (i < expectdomain[j].ai->nrevcomp) {
1082 ac = expectdomain[j].ai->rev_parsecomp(
1083 pai->qu->query_dgram + labstart, lablen);
1084 if (ac < 0) goto mismatch;
1085 assert(i < sizeof(ipv[j]));
1088 tp = expectdomain[j].tail[i - expectdomain[j].ai->nrevcomp];
1090 strncmp(pai->qu->query_dgram + labstart, tp, lablen) != 0 ||
1098 if (!f) return adns_s_querydomainwrong;
1102 if (lablen < 0) return adns_s_querydomainwrong;
1103 for (j = 0; j < n_ed; j++) {
1104 if (!(f & (1 << j))) continue;
1105 if (i >= expectdomain[j].ai->nrevcomp &&
1106 !expectdomain[j].tail[i - expectdomain[j].ai->nrevcomp])
1107 { foundj = j; continue; }
1109 if (!f) return adns_s_querydomainwrong;
1111 assert(foundj >= 0 && f == (1 << foundj)); /* collapsed to a single type */
1113 ap->ai = expectdomain[foundj].ai;
1114 ap->ai->rev_mkaddr(&ap->addr, ipv[foundj]);
1117 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1118 pai->dgram, pai->dglen, dmstart,
1119 ap->ai->rrtype, adns_qf_quoteok_query);
1123 ctx.callback= icb_ptr;
1124 memset(&ctx.info,0,sizeof(ctx.info));
1125 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(ap->ai->rrtype),
1126 ap->ai->rrtype, &pai->qu->vb, id,
1127 adns_qf_quoteok_query, pai->now, &ctx);
1130 nqu->parent= pai->qu;
1131 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
1139 static void mf_strpair(adns_query qu, void *datap) {
1140 adns_rr_strpair *rrp= datap;
1142 adns__makefinal_str(qu,&rrp->array[0]);
1143 adns__makefinal_str(qu,&rrp->array[1]);
1150 static void mf_intstrpair(adns_query qu, void *datap) {
1151 adns_rr_intstrpair *rrp= datap;
1153 adns__makefinal_str(qu,&rrp->array[0].str);
1154 adns__makefinal_str(qu,&rrp->array[1].str);
1161 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1162 int max, void *datap) {
1163 adns_rr_intstrpair *rrp= datap;
1167 for (i=0; i<2; i++) {
1168 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1172 if (cbyte != max) return adns_s_invaliddata;
1181 static adns_status pap_mailbox822(const parseinfo *pai,
1182 int *cbyte_io, int max, char **mb_r) {
1183 int lablen, labstart, i, needquote, c, r, neednorm;
1184 const unsigned char *p;
1186 findlabel_state fls;
1192 adns__findlabel_start(&fls, pai->ads,
1194 pai->dgram, pai->dglen, max,
1195 *cbyte_io, cbyte_io);
1196 st= adns__findlabel_next(&fls,&lablen,&labstart);
1198 adns__vbuf_appendstr(vb,".");
1203 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1205 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1206 if (c == '.' && !neednorm) neednorm= 1;
1207 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1211 if (needquote || neednorm) {
1212 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1213 adns__vbuf_appendq(vb,"\"",1);
1214 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1216 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1217 adns__vbuf_appendq(vb,p,1);
1219 adns__vbuf_appendq(vb,"\"",1);
1221 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1224 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1226 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1230 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1231 memcpy(str,vb->buf,vb->used);
1237 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1239 if (pai->qu->typei->typekey & adns__qtf_mail822) {
1240 return pap_mailbox822(pai, cbyte_io, max, mb_r);
1242 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1246 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1247 return csp_domain(vb,mailbox);
1254 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1255 int max, void *datap) {
1256 adns_rr_strpair *rrp= datap;
1259 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1262 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1265 if (cbyte != max) return adns_s_invaliddata;
1269 static adns_status cs_rp(vbuf *vb, const void *datap) {
1270 const adns_rr_strpair *rrp= datap;
1273 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
1275 st= csp_domain(vb,rrp->array[1]); if (st) return st;
1284 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1285 int max, void *datap) {
1286 adns_rr_soa *rrp= datap;
1287 const byte *dgram= pai->dgram;
1291 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1292 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1295 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1298 if (cbyte+20 != max) return adns_s_invaliddata;
1300 for (i=0; i<5; i++) {
1303 (&rrp->serial)[i]= (msw<<16) | lsw;
1309 static void mf_soa(adns_query qu, void *datap) {
1310 adns_rr_soa *rrp= datap;
1312 adns__makefinal_str(qu,&rrp->mname);
1313 adns__makefinal_str(qu,&rrp->rname);
1316 static adns_status cs_soa(vbuf *vb, const void *datap) {
1317 const adns_rr_soa *rrp= datap;
1322 st= csp_domain(vb,rrp->mname); if (st) return st;
1324 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1326 for (i=0; i<5; i++) {
1327 sprintf(buf," %lu",(&rrp->serial)[i]);
1335 * _srv* (pa*2,di,cs*2,qdpl,postsort)
1338 static adns_status qdpl_srv(adns_state ads,
1339 const char **p_io, const char *pe, int labelnum,
1340 char label_r[DNS_MAXDOMAIN], int *ll_io,
1341 adns_queryflags flags,
1342 const typeinfo *typei) {
1347 if (labelnum < 2 && !(flags & adns_qf_quoteok_query)) {
1348 useflags= adns_qf_quoteok_query;
1354 st= adns__qdpl_normal(ads, p_io,pe, labelnum,label_r, ll_io, useflags,typei);
1359 if (!ll || label_r[0]!='_')
1360 return adns_s_querydomaininvalid;
1361 if (memchr(p_orig+1, '\\', pe - (p_orig+1)))
1362 return adns_s_querydomaininvalid;
1367 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1369 /* might be adns_rr_srvraw* */) {
1370 const byte *dgram= pai->dgram;
1374 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1376 rrp->priority= GET_W(cbyte, ti);
1377 rrp->weight= GET_W(cbyte, ti);
1378 rrp->port= GET_W(cbyte, ti);
1382 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1383 int max, void *datap) {
1384 adns_rr_srvraw *rrp= datap;
1387 st= pap_srv_begin(pai,&cbyte,max,datap);
1390 st= pap_domain(pai, &cbyte, max, &rrp->host,
1391 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1394 if (cbyte != max) return adns_s_invaliddata;
1398 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1399 int max, void *datap) {
1400 adns_rr_srvha *rrp= datap;
1403 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1404 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1405 if (cbyte != max) return adns_s_invaliddata;
1409 static void mf_srvraw(adns_query qu, void *datap) {
1410 adns_rr_srvraw *rrp= datap;
1411 adns__makefinal_str(qu, &rrp->host);
1414 static void mf_srvha(adns_query qu, void *datap) {
1415 adns_rr_srvha *rrp= datap;
1416 mfp_hostaddr(qu,&rrp->ha);
1419 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1420 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1421 /* might be const adns_rr_svhostaddr* */
1423 if (ap->priority < bp->priority) return 0;
1424 if (ap->priority > bp->priority) return 1;
1428 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1429 /* might be adns_rr_srvraw* */) {
1431 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1436 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1437 const adns_rr_srvraw *rrp= datap;
1440 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1441 return csp_domain(vb,rrp->host);
1444 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1445 const adns_rr_srvha *rrp= datap;
1448 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1449 return csp_hostaddr(vb,&rrp->ha);
1452 static void postsort_srv(adns_state ads, void *array, int nrrs,
1453 const struct typeinfo *typei) {
1454 /* we treat everything in the array as if it were an adns_rr_srvha
1455 * even though the array might be of adns_rr_srvraw. That's OK
1456 * because they have the same prefix, which is all we access.
1457 * We use typei->rrsz, too, rather than naive array indexing, of course.
1459 char *workbegin, *workend, *search, *arrayend;
1460 const adns_rr_srvha *rr;
1461 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1462 int cpriority, totalweight, runtotal;
1465 for (workbegin= array, arrayend= workbegin + typei->rrsz * nrrs;
1466 workbegin < arrayend;
1467 workbegin= workend) {
1468 cpriority= (rr=(void*)workbegin)->priority;
1470 for (workend= workbegin, totalweight= 0;
1471 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1472 workend += typei->rrsz) {
1473 totalweight += rr->weight;
1476 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1477 * cpriority. From now on, workbegin points to the `remaining'
1478 * records: we select one record at a time (RFC2782 `Usage rules'
1479 * and `Format of the SRV RR' subsection `Weight') to place at
1480 * workbegin (swapping with the one that was there, and then
1481 * advance workbegin. */
1483 workbegin + typei->rrsz < workend; /* don't bother if just one */
1484 workbegin += typei->rrsz) {
1486 randval= nrand48(ads->rand48xsubi);
1487 randval %= (totalweight + 1);
1488 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1489 * totalweight must be <= 2^26 so probability nonuniformity is
1490 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1491 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1494 for (search=workbegin, runtotal=0;
1495 (runtotal += (rr=(void*)search)->weight) < randval;
1496 search += typei->rrsz);
1497 assert(search < arrayend);
1498 totalweight -= rr->weight;
1499 if (search != workbegin) {
1500 memcpy(&rrtmp, workbegin, typei->rrsz);
1501 memcpy(workbegin, search, typei->rrsz);
1502 memcpy(search, &rrtmp, typei->rrsz);
1507 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1508 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1509 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1517 static void mf_byteblock(adns_query qu, void *datap) {
1518 adns_rr_byteblock *rrp= datap;
1519 void *bytes= rrp->data;
1520 adns__makefinal_block(qu,&bytes,rrp->len);
1528 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1529 int max, void *datap) {
1530 adns_rr_byteblock *rrp= datap;
1532 rrp->len= max - cbyte;
1533 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1534 if (!rrp->data) R_NOMEM;
1535 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1539 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1540 const adns_rr_byteblock *rrp= datap;
1545 sprintf(buf,"\\# %d",rrp->len);
1548 for (l= rrp->len, p= rrp->data;
1551 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1557 sprintf(buf," %02x",*p);
1567 static void mf_flat(adns_query qu, void *data) { }
1573 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1575 #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb
1576 #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb
1578 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1579 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), \
1580 mf_##memb, printer,parser,comparer, adns__qdpl_normal,0,0 }
1581 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1582 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), \
1583 mf_flat, printer,parser,comparer, adns__qdpl_normal,0,0 }
1584 #define XTRA_TYPE(code,rrt,fmt,memb,parser,comparer,printer, \
1585 makefinal,qdpl,postsort,sender) \
1586 { adns_r_##code & adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), makefinal, \
1587 printer,parser,comparer,qdpl,postsort,sender }
1589 static const typeinfo typeinfos[] = {
1590 /* Must be in ascending order of rrtype ! */
1591 /* mem-mgmt code rrt fmt member parser comparer printer */
1593 FLAT_TYPE(a, "A", 0, inaddr, pa_inaddr, di_inaddr,cs_inaddr ),
1594 DEEP_TYPE(ns_raw, "NS", "raw",str, pa_host_raw,0, cs_domain ),
1595 DEEP_TYPE(cname, "CNAME", 0, str, pa_dom_raw, 0, cs_domain ),
1596 DEEP_TYPE(soa_raw,"SOA", "raw",soa, pa_soa, 0, cs_soa ),
1597 DEEP_TYPE(ptr_raw,"PTR", "raw",str, pa_host_raw,0, cs_domain ),
1598 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,pa_hinfo, 0, cs_hinfo ),
1599 DEEP_TYPE(mx_raw, "MX", "raw",intstr, pa_mx_raw, di_mx_raw,cs_inthost ),
1600 DEEP_TYPE(txt, "TXT", 0, manyistr,pa_txt, 0, cs_txt ),
1601 DEEP_TYPE(rp_raw, "RP", "raw",strpair, pa_rp, 0, cs_rp ),
1602 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, pa_in6addr, di_in6addr,cs_in6addr ),
1603 XTRA_TYPE(srv_raw,"SRV", "raw",srvraw , pa_srvraw, di_srv, cs_srvraw,
1604 mf_srvraw, qdpl_srv, postsort_srv, 0),
1606 XTRA_TYPE(addr, "A", "addr", addr, pa_addr, di_addr, cs_addr,
1607 mf_flat, adns__qdpl_normal, 0, qs_addr),
1608 DEEP_TYPE(ns, "NS", "+addr",hostaddr,pa_hostaddr,di_hostaddr,cs_hostaddr ),
1609 DEEP_TYPE(ptr, "PTR","checked",str, pa_ptr, 0, cs_domain ),
1610 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,pa_mx, di_mx, cs_inthostaddr),
1611 XTRA_TYPE(srv, "SRV","+addr",srvha, pa_srvha, di_srv, cs_srvha,
1612 mf_srvha, qdpl_srv, postsort_srv, 0),
1614 DEEP_TYPE(soa, "SOA","822", soa, pa_soa, 0, cs_soa ),
1615 DEEP_TYPE(rp, "RP", "822", strpair, pa_rp, 0, cs_rp ),
1618 static const typeinfo typeinfo_unknown=
1619 DEEP_TYPE(unknown,0, "unknown",byteblock,pa_opaque, 0, cs_opaque );
1621 const typeinfo *adns__findtype(adns_rrtype type) {
1622 const typeinfo *begin, *end, *mid;
1624 if (type & adns_r_unknown) return &typeinfo_unknown;
1625 type &= adns_rrt_reprmask;
1627 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1629 while (begin < end) {
1630 mid= begin + ((end-begin)>>1);
1631 if (mid->typekey == type) return mid;
1632 if (type > mid->typekey) begin= mid+1;