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.
29 #include <sys/types.h>
30 #include <sys/socket.h>
31 #include <netinet/in.h>
32 #include <arpa/inet.h>
36 #define R_NOMEM return adns_s_nomemory
37 #define CSP_ADDSTR(s) do { \
38 if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
45 * _textdata, _qstring (csp)
51 * +search_sortlist, dip_genaddr, csp_genaddr)
53 * _addr (pa,di,div,csp,cs,gsz,qs
54 * +search_sortlst_sa, dip_sockaddr,
55 * addr_rrtypes, icb_addr)
56 * _domain (pap,csp,cs)
59 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs
60 * +pap_findaddrs, icb_hostaddr)
63 * _inthostaddr (mf,cs)
65 * _ptr (ckl,pa +icb_ptr)
69 * _mailbox (pap,csp +pap_mailbox822)
72 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
77 * within each section:
96 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
97 int *len_r, char **str_r) {
98 /* Neither len_r nor str_r may be null.
99 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
101 const byte *dgram= pai->dgram;
107 if (cbyte >= max) return adns_s_invaliddata;
109 if (cbyte+l > max) return adns_s_invaliddata;
111 str= adns__alloc_interim(pai->qu, l+1);
115 memcpy(str,dgram+cbyte,l);
124 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
130 for (cn=0; cn<len; cn++) {
134 } else if (ch == '"') {
136 } else if (ch >= 32 && ch <= 126) {
137 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
139 sprintf(buf,"\\x%02x",ch);
152 static void mf_str(adns_query qu, void *datap) {
155 adns__makefinal_str(qu,rrp);
162 static void mf_intstr(adns_query qu, void *datap) {
163 adns_rr_intstr *rrp= datap;
165 adns__makefinal_str(qu,&rrp->str);
172 static void mf_manyistr(adns_query qu, void *datap) {
173 adns_rr_intstr **rrp= datap;
174 adns_rr_intstr *te, *table;
178 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
180 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
182 for (te= *rrp; te->i >= 0; te++)
183 adns__makefinal_str(qu,&te->str);
190 static adns_status pa_txt(const parseinfo *pai, int cbyte,
191 int max, void *datap) {
192 adns_rr_intstr **rrp= datap, *table, *te;
193 const byte *dgram= pai->dgram;
194 int ti, tc, l, startbyte;
198 if (cbyte >= max) return adns_s_invaliddata;
200 while (cbyte < max) {
205 if (cbyte != max || !tc) return adns_s_invaliddata;
207 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
210 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
211 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
214 assert(cbyte == max);
223 static adns_status cs_txt(vbuf *vb, const void *datap) {
224 const adns_rr_intstr *const *rrp= datap;
225 const adns_rr_intstr *current;
229 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
230 if (spc) CSP_ADDSTR(" ");
231 st= csp_qstring(vb,current->str,current->i); if (st) return st;
240 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
241 const adns_rr_intstrpair *rrp= datap;
244 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
246 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
251 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
254 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
255 int max, void *datap) {
256 struct in_addr *storeto= datap;
258 if (max-cbyte != 4) return adns_s_invaliddata;
259 memcpy(storeto, pai->dgram + cbyte, 4);
263 static int search_sortlist(adns_state ads, int af, const void *ad) {
264 const struct sortlist *slp;
265 const struct in6_addr *a6;
270 if (af == AF_INET6) {
272 if (IN6_IS_ADDR_V4MAPPED(a6)) {
273 a.v4.s_addr= htonl(((unsigned long)a6->s6_addr[12] << 24) |
274 ((unsigned long)a6->s6_addr[13] << 16) |
275 ((unsigned long)a6->s6_addr[14] << 8) |
276 ((unsigned long)a6->s6_addr[15] << 0));
281 for (i=0, slp=ads->sortlist;
283 !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask) &&
285 adns__addr_match_p(AF_INET,&a, slp->af,&slp->base,&slp->mask));
290 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
293 if (!ads->nsortlist) return 0;
295 ai= search_sortlist(ads,af,a);
296 bi= search_sortlist(ads,af,b);
300 static int di_inaddr(adns_state ads,
301 const void *datap_a, const void *datap_b) {
302 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
305 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
306 char buf[ADNS_ADDR2TEXT_BUFLEN];
307 int len= sizeof(buf);
311 memset(&a, 0, sizeof(a));
312 a.addr.sa.sa_family= af;
313 adns__sockaddr_inject(p, 0, &a.addr.sa);
314 err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
319 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
320 return csp_genaddr(vb, AF_INET,datap);
324 * _in6addr (pa,di,cs)
327 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
328 int max, void *datap) {
329 struct in6_addr *storeto= datap;
331 if (max-cbyte != 16) return adns_s_invaliddata;
332 memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
336 static int di_in6addr(adns_state ads,
337 const void *datap_a, const void *datap_b) {
338 return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
341 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
342 return csp_genaddr(vb,AF_INET6,datap);
346 * _addr (pa,di,div,csp,cs,gsz,qs
347 * +search_sortlist_sa, dip_sockaddr, addr_rrtypes, icb_addr)
350 static const typeinfo tinfo_addrsub;
352 #define ADDR_RRTYPES(_) _(a)
354 static const adns_rrtype addr_all_rrtypes[] = {
355 #define RRTY_CODE(ty) adns_r_##ty,
356 ADDR_RRTYPES(RRTY_CODE)
361 #define RRTY_INDEX(ty) addr__ri_##ty,
362 ADDR_RRTYPES(RRTY_INDEX)
365 #define RRTY_FLAG(ty) addr_rf_##ty = 1 << addr__ri_##ty,
366 ADDR_RRTYPES(RRTY_FLAG)
371 static unsigned addr_rrtypeflag(adns_rrtype type) {
374 type &= adns_rrt_typemask;
375 for (i=0; i<addr_nrrtypes && type!=addr_all_rrtypes[i]; i++);
376 return i < addr_nrrtypes ? 1 << i : 0;
379 static adns_status pa_addr(const parseinfo *pai, int cbyte,
380 int max, void *datap) {
381 adns_rr_addr *storeto= datap;
382 const byte *dgram= pai->dgram;
384 if (max-cbyte != 4) return adns_s_invaliddata;
385 storeto->len= sizeof(storeto->addr.inet);
386 memset(&storeto->addr,0,sizeof(storeto->addr.inet));
387 storeto->addr.inet.sin_family= AF_INET;
388 memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
392 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
394 adns__sockaddr_extract(sa, &a, 0);
395 return search_sortlist(ads, sa->sa_family, &a);
398 static int dip_sockaddr(adns_state ads,
399 const struct sockaddr *sa,
400 const struct sockaddr *sb) {
401 if (!ads->sortlist) return 0;
402 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
405 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
406 const adns_rr_addr *ap= datap_a, *bp= datap_b;
407 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
410 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
411 const adns_state ads= context;
413 return di_addr(ads, datap_a, datap_b);
416 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
417 char buf[ADNS_ADDR2TEXT_BUFLEN];
418 int len= sizeof(buf);
421 switch (rrp->addr.inet.sin_family) {
426 CSP_ADDSTR("INET6 ");
429 err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
433 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
440 static adns_status cs_addr(vbuf *vb, const void *datap) {
441 const adns_rr_addr *rrp= datap;
443 return csp_addr(vb,rrp);
446 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
447 return type & adns__qtf_bigaddr ?
448 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
451 static unsigned addr_rrtypes(adns_state ads, adns_rrtype type,
452 adns_queryflags qf) {
453 /* Return a mask of addr_rf_... flags indicating which address families are
454 * wanted, given a query type and flags.
459 static void icb_addr(adns_query parent, adns_query child);
461 static void addr_subqueries(adns_query qu, struct timeval now,
462 adns_queryflags qf_extra,
463 const byte *qd_dgram, int qd_dglen) {
466 adns_queryflags qf= (qu->flags & ~adns_qf_search) | qf_extra;
467 adns_rrtype qtf= qu->answer->type & adns__qtf_deref;
468 unsigned which= qu->ctx.tinfo.addr.want & ~qu->ctx.tinfo.addr.have;
471 memset(&ctx, 0, sizeof(ctx));
472 ctx.callback= icb_addr;
473 for (i=0; i<addr_nrrtypes; i++) {
474 if (!(which & (1 << i))) continue;
475 err= adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qd_dgram,qd_dglen,
476 DNS_HDRSIZE, addr_all_rrtypes[i], qf);
477 if (err) goto x_error;
478 err= adns__internal_submit(qu->ads, &cqu, &tinfo_addrsub,
479 addr_all_rrtypes[i] | qtf,
480 &qu->vb, id, qf, now, &ctx);
481 if (err) goto x_error;
482 cqu->answer->rrsz= qu->answer->rrsz;
484 LIST_LINK_TAIL_PART(qu->children, cqu,siblings.);
486 qu->state= query_childw;
487 LIST_LINK_TAIL(qu->ads->childw, qu);
491 adns__query_fail(qu, err);
494 static adns_status append_addrs(adns_query qu, size_t rrsz,
495 adns_rr_addr **dp, int *dlen,
496 const adns_rr_addr *sp, int slen) {
497 /* Append a vector of slen addr records, each of size rrsz, starting at ap,
498 * to a vector starting at *dp, of length *dlen. On successful completion,
499 * *dp and *dlen are updated.
502 size_t drrsz= *dlen*rrsz, srrsz= slen*rrsz;
505 if (!slen) return adns_s_ok;
506 p= adns__alloc_interim(qu, drrsz + srrsz);
509 memcpy(p, *dp, drrsz);
510 adns__free_interim(qu, *dp);
512 memcpy(p + drrsz, sp, srrsz);
514 *dp= (adns_rr_addr *)p;
518 static void propagate_ttl(adns_query to, adns_query from)
519 { if (to->expires > from->expires) to->expires= from->expires; }
521 static adns_status copy_cname_from_child(adns_query parent, adns_query child) {
522 adns_answer *pans= parent->answer, *cans= child->answer;
523 size_t n= strlen(cans->cname) + 1;
525 pans->cname= adns__alloc_preserved(parent, n);
526 if (!pans->cname) R_NOMEM;
527 memcpy(pans->cname, cans->cname, n);
531 static void done_addr_type(adns_query qu, adns_rrtype type) {
532 unsigned f= addr_rrtypeflag(type);
533 assert(f); qu->ctx.tinfo.addr.have |= f;
536 static void icb_addr(adns_query parent, adns_query child) {
537 adns_state ads= parent->ads;
538 adns_answer *pans= parent->answer, *cans= child->answer;
542 propagate_ttl(parent, child);
544 if (cans->cname && !pans->cname) {
545 err= copy_cname_from_child(parent, child);
549 if ((parent->flags & adns_qf_search) &&
550 !pans->cname && cans->status == adns_s_nxdomain) {
551 /* We're searching a list of suffixes, and the name doesn't exist. Try
555 adns__cancel_children(parent);
556 adns__free_interim(parent, pans->rrs.bytes);
557 pans->rrs.bytes= 0; pans->nrrs= 0;
558 if (gettimeofday(&now, 0)) goto x_gtod;
559 adns__search_next(ads, parent, now);
563 if (cans->status && cans->status != adns_s_nodata)
564 { err= cans->status; goto x_err; }
566 assert(pans->rrsz == cans->rrsz);
567 err= append_addrs(parent, pans->rrsz,
568 &pans->rrs.addr, &pans->nrrs,
569 cans->rrs.addr, cans->nrrs);
571 done_addr_type(parent, cans->type);
573 if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
574 else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
575 else adns__query_done(parent);
579 adns__diag(ads, -1, parent, "gettimeofday failed: %s", strerror(errno));
580 err= adns_s_systemfail;
584 adns__query_fail(parent, err);
587 static void qs_addr(adns_query qu, struct timeval now) {
588 if (!qu->ctx.tinfo.addr.want) {
589 qu->ctx.tinfo.addr.want= addr_rrtypes(qu->ads, qu->answer->type,
591 qu->ctx.tinfo.addr.have= 0;
593 addr_subqueries(qu, now, 0, qu->query_dgram, qu->query_dglen);
597 * _domain (pap,csp,cs)
601 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
602 char **domain_r, parsedomain_flags flags) {
606 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
607 pai->dgram,pai->dglen, cbyte_io, max);
609 if (!pai->qu->vb.used) return adns_s_invaliddata;
611 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
614 dm[pai->qu->vb.used]= 0;
615 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
621 static adns_status csp_domain(vbuf *vb, const char *domain) {
623 if (!*domain) CSP_ADDSTR(".");
627 static adns_status cs_domain(vbuf *vb, const void *datap) {
628 const char *const *domainp= datap;
629 return csp_domain(vb,*domainp);
632 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
633 int max, void *datap) {
637 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
640 if (cbyte != max) return adns_s_invaliddata;
648 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
649 int max, void *datap) {
653 st= pap_domain(pai, &cbyte, max, rrp,
654 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
657 if (cbyte != max) return adns_s_invaliddata;
662 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
665 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
667 int *cbyte_io, int count, int dmstart) {
669 int type, class, rdlen, rdstart, ownermatched;
673 for (rri=0, naddrs=-1; rri<count; rri++) {
674 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
675 pai->dglen, cbyte_io,
676 &type, &class, &ttl, &rdlen, &rdstart,
677 pai->dgram, pai->dglen, dmstart, &ownermatched);
679 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
680 if (naddrs>0) break; else continue;
685 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
687 adns__update_expires(pai->qu,ttl,pai->now);
688 st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
693 ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
694 if (!ha->addrs) R_NOMEM;
695 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
697 ha->astatus= adns_s_ok;
699 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
705 static void icb_hostaddr(adns_query parent, adns_query child) {
706 adns_answer *cans= child->answer;
707 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
708 adns_state ads= parent->ads;
713 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
714 rrp->addrs= cans->rrs.addr;
715 adns__transfer_interim(child, parent, rrp->addrs);
717 if (parent->children.head) {
718 LIST_LINK_TAIL(ads->childw,parent);
720 adns__query_done(parent);
724 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
725 int max, adns_rr_hostaddr *rrp) {
731 adns_queryflags nflags;
732 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
734 dmstart= cbyte= *cbyte_io;
735 st= pap_domain(pai, &cbyte, max, &rrp->host,
736 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
740 rrp->astatus= adns_s_ok;
746 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
748 if (rrp->naddrs != -1) return adns_s_ok;
750 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
752 if (rrp->naddrs != -1) return adns_s_ok;
754 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
755 pai->dgram, pai->dglen, dmstart,
756 adns_r_addr, adns_qf_quoteok_query);
760 ctx.callback= icb_hostaddr;
761 ctx.pinfo.hostaddr= rrp;
762 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
764 nflags= adns_qf_quoteok_query;
765 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
767 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
768 ((adns_r_addr & adns_rrt_reprmask) |
769 (pai->qu->answer->type & ~adns_rrt_reprmask)),
770 &pai->qu->vb, id, nflags, pai->now, &ctx);
773 nqu->parent= pai->qu;
774 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
779 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
780 int max, void *datap) {
781 adns_rr_hostaddr *rrp= datap;
784 st= pap_hostaddr(pai, &cbyte, max, rrp);
786 if (cbyte != max) return adns_s_invaliddata;
791 static int dip_hostaddr(adns_state ads,
792 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
793 if (ap->astatus != bp->astatus) return ap->astatus;
794 if (ap->astatus) return 0;
796 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
799 static int di_hostaddr(adns_state ads,
800 const void *datap_a, const void *datap_b) {
801 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
803 return dip_hostaddr(ads, ap,bp);
806 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
808 size_t addrsz= gsz_addr(0, qu->answer->type);
810 adns__makefinal_str(qu,&rrp->host);
812 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
816 static void mf_hostaddr(adns_query qu, void *datap) {
817 adns_rr_hostaddr *rrp= datap;
819 mfp_hostaddr(qu,rrp);
822 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
828 st= csp_domain(vb,rrp->host); if (st) return st;
831 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
833 sprintf(buf," %d ",rrp->astatus);
836 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
839 errstr= adns_strerror(rrp->astatus);
840 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
842 if (rrp->naddrs >= 0) {
844 for (i=0; i<rrp->naddrs; i++) {
846 st= csp_addr(vb,&rrp->addrs[i]);
855 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
856 const adns_rr_hostaddr *rrp= datap;
858 return csp_hostaddr(vb,rrp);
865 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
866 int max, void *datap) {
867 const byte *dgram= pai->dgram;
868 adns_rr_intstr *rrp= datap;
872 if (cbyte+2 > max) return adns_s_invaliddata;
875 st= pap_domain(pai, &cbyte, max, &rrp->str,
876 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
879 if (cbyte != max) return adns_s_invaliddata;
883 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
884 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
886 if (ap->i < bp->i) return 0;
887 if (ap->i > bp->i) return 1;
895 static adns_status pa_mx(const parseinfo *pai, int cbyte,
896 int max, void *datap) {
897 const byte *dgram= pai->dgram;
898 adns_rr_inthostaddr *rrp= datap;
902 if (cbyte+2 > max) return adns_s_invaliddata;
905 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
908 if (cbyte != max) return adns_s_invaliddata;
912 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
913 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
915 if (ap->i < bp->i) return 0;
916 if (ap->i > bp->i) return 1;
917 return dip_hostaddr(ads, &ap->ha, &bp->ha);
921 * _inthostaddr (mf,cs)
924 static void mf_inthostaddr(adns_query qu, void *datap) {
925 adns_rr_inthostaddr *rrp= datap;
927 mfp_hostaddr(qu,&rrp->ha);
930 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
931 const adns_rr_inthostaddr *rrp= datap;
934 sprintf(buf,"%u ",rrp->i);
937 return csp_hostaddr(vb,&rrp->ha);
944 static adns_status cs_inthost(vbuf *vb, const void *datap) {
945 const adns_rr_intstr *rrp= datap;
948 sprintf(buf,"%u ",rrp->i);
950 return csp_domain(vb,rrp->str);
954 * _ptr (ckl,pa +icb_ptr)
957 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
958 union checklabel_state *cls, qcontext *ctx,
959 int labnum, const char *label, int lablen) {
961 if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
962 return adns_s_querydomainwrong;
964 if (adns__revparse_done(&cls->ptr, labnum,
965 &ctx->tinfo.ptr.rev_rrtype,
966 &ctx->tinfo.ptr.addr))
967 return adns_s_querydomainwrong;
972 static void icb_ptr(adns_query parent, adns_query child) {
973 adns_answer *cans= child->answer;
974 const struct af_addr *queried;
975 const unsigned char *found;
976 adns_state ads= parent->ads;
979 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
980 adns__query_fail(parent,adns_s_inconsistent);
982 } else if (cans->status) {
983 adns__query_fail(parent,cans->status);
987 queried= &parent->ctx.tinfo.ptr.addr;
988 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
989 if (adns__genaddr_equal_p(queried->af,&queried->addr,
990 parent->ctx.tinfo.ptr.addr.af,found)) {
991 if (!parent->children.head) {
992 adns__query_done(parent);
995 LIST_LINK_TAIL(ads->childw,parent);
1001 adns__query_fail(parent,adns_s_inconsistent);
1004 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1005 int max, void *datap) {
1008 adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
1014 st= pap_domain(pai, &cbyte, max, rrp,
1015 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1017 if (cbyte != max) return adns_s_invaliddata;
1019 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1020 pai->dgram, pai->dglen, dmstart,
1021 rrtype, adns_qf_quoteok_query);
1025 ctx.callback= icb_ptr;
1026 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
1027 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
1028 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(rrtype),
1029 rrtype, &pai->qu->vb, id,
1030 adns_qf_quoteok_query, pai->now, &ctx);
1033 nqu->parent= pai->qu;
1034 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
1042 static void mf_strpair(adns_query qu, void *datap) {
1043 adns_rr_strpair *rrp= datap;
1045 adns__makefinal_str(qu,&rrp->array[0]);
1046 adns__makefinal_str(qu,&rrp->array[1]);
1053 static void mf_intstrpair(adns_query qu, void *datap) {
1054 adns_rr_intstrpair *rrp= datap;
1056 adns__makefinal_str(qu,&rrp->array[0].str);
1057 adns__makefinal_str(qu,&rrp->array[1].str);
1064 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1065 int max, void *datap) {
1066 adns_rr_intstrpair *rrp= datap;
1070 for (i=0; i<2; i++) {
1071 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1075 if (cbyte != max) return adns_s_invaliddata;
1081 * _mailbox (pap,cs +pap_mailbox822)
1084 static adns_status pap_mailbox822(const parseinfo *pai,
1085 int *cbyte_io, int max, char **mb_r) {
1086 int lablen, labstart, i, needquote, c, r, neednorm;
1087 const unsigned char *p;
1089 findlabel_state fls;
1095 adns__findlabel_start(&fls, pai->ads,
1097 pai->dgram, pai->dglen, max,
1098 *cbyte_io, cbyte_io);
1099 st= adns__findlabel_next(&fls,&lablen,&labstart);
1101 adns__vbuf_appendstr(vb,".");
1106 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1108 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1109 if (c == '.' && !neednorm) neednorm= 1;
1110 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1114 if (needquote || neednorm) {
1115 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1116 adns__vbuf_appendq(vb,"\"",1);
1117 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1119 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1120 adns__vbuf_appendq(vb,p,1);
1122 adns__vbuf_appendq(vb,"\"",1);
1124 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1127 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1129 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1133 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1134 memcpy(str,vb->buf,vb->used);
1140 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1142 if (pai->qu->typei->typekey & adns__qtf_mail822) {
1143 return pap_mailbox822(pai, cbyte_io, max, mb_r);
1145 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1149 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1150 return csp_domain(vb,mailbox);
1157 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1158 int max, void *datap) {
1159 adns_rr_strpair *rrp= datap;
1162 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1165 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1168 if (cbyte != max) return adns_s_invaliddata;
1172 static adns_status cs_rp(vbuf *vb, const void *datap) {
1173 const adns_rr_strpair *rrp= datap;
1176 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
1178 st= csp_domain(vb,rrp->array[1]); if (st) return st;
1187 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1188 int max, void *datap) {
1189 adns_rr_soa *rrp= datap;
1190 const byte *dgram= pai->dgram;
1194 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1195 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1198 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1201 if (cbyte+20 != max) return adns_s_invaliddata;
1203 for (i=0; i<5; i++) {
1206 (&rrp->serial)[i]= (msw<<16) | lsw;
1212 static void mf_soa(adns_query qu, void *datap) {
1213 adns_rr_soa *rrp= datap;
1215 adns__makefinal_str(qu,&rrp->mname);
1216 adns__makefinal_str(qu,&rrp->rname);
1219 static adns_status cs_soa(vbuf *vb, const void *datap) {
1220 const adns_rr_soa *rrp= datap;
1225 st= csp_domain(vb,rrp->mname); if (st) return st;
1227 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1229 for (i=0; i<5; i++) {
1230 sprintf(buf," %lu",(&rrp->serial)[i]);
1238 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1241 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1242 union checklabel_state *cls, qcontext *ctx,
1243 int labnum, const char *label, int lablen) {
1244 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1245 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1248 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1251 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1253 /* might be adns_rr_srvraw* */) {
1254 const byte *dgram= pai->dgram;
1258 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1260 rrp->priority= GET_W(cbyte, ti);
1261 rrp->weight= GET_W(cbyte, ti);
1262 rrp->port= GET_W(cbyte, ti);
1266 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1267 int max, void *datap) {
1268 adns_rr_srvraw *rrp= datap;
1271 st= pap_srv_begin(pai,&cbyte,max,datap);
1274 st= pap_domain(pai, &cbyte, max, &rrp->host,
1275 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1278 if (cbyte != max) return adns_s_invaliddata;
1282 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1283 int max, void *datap) {
1284 adns_rr_srvha *rrp= datap;
1287 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1288 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1289 if (cbyte != max) return adns_s_invaliddata;
1293 static void mf_srvraw(adns_query qu, void *datap) {
1294 adns_rr_srvraw *rrp= datap;
1295 adns__makefinal_str(qu, &rrp->host);
1298 static void mf_srvha(adns_query qu, void *datap) {
1299 adns_rr_srvha *rrp= datap;
1300 mfp_hostaddr(qu,&rrp->ha);
1303 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1304 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1305 /* might be const adns_rr_svhostaddr* */
1307 if (ap->priority < bp->priority) return 0;
1308 if (ap->priority > bp->priority) return 1;
1312 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1313 /* might be adns_rr_srvraw* */) {
1315 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1320 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1321 const adns_rr_srvraw *rrp= datap;
1324 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1325 return csp_domain(vb,rrp->host);
1328 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1329 const adns_rr_srvha *rrp= datap;
1332 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1333 return csp_hostaddr(vb,&rrp->ha);
1336 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1337 const struct typeinfo *typei) {
1338 /* we treat everything in the array as if it were an adns_rr_srvha
1339 * even though the array might be of adns_rr_srvraw. That's OK
1340 * because they have the same prefix, which is all we access.
1341 * We use rrsz, too, rather than naive array indexing, of course.
1343 char *workbegin, *workend, *search, *arrayend;
1344 const adns_rr_srvha *rr;
1345 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1346 int cpriority, totalweight, runtotal;
1349 assert(rrsz <= sizeof(rrtmp));
1350 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1351 workbegin < arrayend;
1352 workbegin= workend) {
1353 cpriority= (rr=(void*)workbegin)->priority;
1355 for (workend= workbegin, totalweight= 0;
1356 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1358 totalweight += rr->weight;
1361 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1362 * cpriority. From now on, workbegin points to the `remaining'
1363 * records: we select one record at a time (RFC2782 `Usage rules'
1364 * and `Format of the SRV RR' subsection `Weight') to place at
1365 * workbegin (swapping with the one that was there, and then
1366 * advance workbegin. */
1368 workbegin + rrsz < workend; /* don't bother if just one */
1369 workbegin += rrsz) {
1371 randval= nrand48(ads->rand48xsubi);
1372 randval %= (totalweight + 1);
1373 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1374 * totalweight must be <= 2^26 so probability nonuniformity is
1375 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1376 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1379 for (search=workbegin, runtotal=0;
1380 (runtotal += (rr=(void*)search)->weight) < randval;
1382 assert(search < arrayend);
1383 totalweight -= rr->weight;
1384 if (search != workbegin) {
1385 memcpy(&rrtmp, workbegin, rrsz);
1386 memcpy(workbegin, search, rrsz);
1387 memcpy(search, &rrtmp, rrsz);
1392 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1393 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1394 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1402 static void mf_byteblock(adns_query qu, void *datap) {
1403 adns_rr_byteblock *rrp= datap;
1404 void *bytes= rrp->data;
1405 adns__makefinal_block(qu,&bytes,rrp->len);
1413 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1414 int max, void *datap) {
1415 adns_rr_byteblock *rrp= datap;
1417 rrp->len= max - cbyte;
1418 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1419 if (!rrp->data) R_NOMEM;
1420 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1424 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1425 const adns_rr_byteblock *rrp= datap;
1430 sprintf(buf,"\\# %d",rrp->len);
1433 for (l= rrp->len, p= rrp->data;
1436 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1442 sprintf(buf," %02x",*p);
1452 static void mf_flat(adns_query qu, void *data) { }
1458 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1460 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1461 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1462 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1463 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1465 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1466 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1467 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1468 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1473 static const typeinfo typeinfos[] = {
1474 /* Must be in ascending order of rrtype ! */
1475 /* mem-mgmt code rrt fmt member parser comparer printer */
1477 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1478 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1479 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1480 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1481 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1482 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1483 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1484 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1485 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1486 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, in6addr, in6addr,in6addr ),
1487 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1488 .checklabel= ckl_srv, .postsort= postsort_srv),
1490 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1491 .getrrsz= gsz_addr, .query_send= qs_addr),
1492 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1493 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1494 .checklabel= ckl_ptr),
1495 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1496 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1497 .checklabel= ckl_srv, .postsort= postsort_srv),
1499 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1500 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1503 static const typeinfo tinfo_addrsub =
1504 FLAT_TYPE(none, "<addr>","sub",addr, addr, 0, addr,
1505 .getrrsz= gsz_addr);
1507 static const typeinfo typeinfo_unknown=
1508 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1510 const typeinfo *adns__findtype(adns_rrtype type) {
1511 const typeinfo *begin, *end, *mid;
1513 if (type & adns_r_unknown) return &typeinfo_unknown;
1514 type &= adns_rrt_reprmask;
1516 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1518 while (begin < end) {
1519 mid= begin + ((end-begin)>>1);
1520 if (mid->typekey == type) return mid;
1521 if (type > mid->typekey) begin= mid+1;