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>
37 #define R_NOMEM return adns_s_nomemory
38 #define CSP_ADDSTR(s) do { \
39 if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
46 * _textdata, _qstring (csp)
52 * +search_sortlist, dip_genaddr, csp_genaddr)
54 * _addr (pap,pa,di,div,csp,cs,gsz,qs
55 * +search_sortlst_sa, dip_sockaddr,
56 * addr_rrtypes, icb_addr)
57 * _domain (pap,csp,cs)
60 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs
61 * +pap_findaddrs, icb_hostaddr)
64 * _inthostaddr (mf,cs)
66 * _ptr (ckl,pa +icb_ptr)
70 * _mailbox (pap,csp +pap_mailbox822)
73 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
78 * within each section:
97 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
98 int *len_r, char **str_r) {
99 /* Neither len_r nor str_r may be null.
100 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
102 const byte *dgram= pai->dgram;
108 if (cbyte >= max) return adns_s_invaliddata;
110 if (cbyte+l > max) return adns_s_invaliddata;
112 str= adns__alloc_interim(pai->qu, l+1);
116 memcpy(str,dgram+cbyte,l);
125 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
131 for (cn=0; cn<len; cn++) {
135 } else if (ch == '"') {
137 } else if (ch >= 32 && ch <= 126) {
138 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
140 sprintf(buf,"\\x%02x",ch);
153 static void mf_str(adns_query qu, void *datap) {
156 adns__makefinal_str(qu,rrp);
163 static void mf_intstr(adns_query qu, void *datap) {
164 adns_rr_intstr *rrp= datap;
166 adns__makefinal_str(qu,&rrp->str);
173 static void mf_manyistr(adns_query qu, void *datap) {
174 adns_rr_intstr **rrp= datap;
175 adns_rr_intstr *te, *table;
179 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
181 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
183 for (te= *rrp; te->i >= 0; te++)
184 adns__makefinal_str(qu,&te->str);
191 static adns_status pa_txt(const parseinfo *pai, int cbyte,
192 int max, void *datap) {
193 adns_rr_intstr **rrp= datap, *table, *te;
194 const byte *dgram= pai->dgram;
195 int ti, tc, l, startbyte;
199 if (cbyte >= max) return adns_s_invaliddata;
201 while (cbyte < max) {
206 if (cbyte != max || !tc) return adns_s_invaliddata;
208 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
211 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
212 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
215 assert(cbyte == max);
224 static adns_status cs_txt(vbuf *vb, const void *datap) {
225 const adns_rr_intstr *const *rrp= datap;
226 const adns_rr_intstr *current;
230 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
231 if (spc) CSP_ADDSTR(" ");
232 st= csp_qstring(vb,current->str,current->i); if (st) return st;
241 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
242 const adns_rr_intstrpair *rrp= datap;
245 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
247 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
252 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
255 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
256 int max, void *datap) {
257 struct in_addr *storeto= datap;
259 if (max-cbyte != 4) return adns_s_invaliddata;
260 memcpy(storeto, pai->dgram + cbyte, 4);
264 static int search_sortlist(adns_state ads, int af, const void *ad) {
265 const struct sortlist *slp;
266 const struct in6_addr *a6;
271 if (af == AF_INET6) {
273 if (IN6_IS_ADDR_V4MAPPED(a6)) {
274 a.v4.s_addr= htonl(((unsigned long)a6->s6_addr[12] << 24) |
275 ((unsigned long)a6->s6_addr[13] << 16) |
276 ((unsigned long)a6->s6_addr[14] << 8) |
277 ((unsigned long)a6->s6_addr[15] << 0));
282 for (i=0, slp=ads->sortlist;
284 !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask) &&
286 adns__addr_match_p(AF_INET,&a, slp->af,&slp->base,&slp->mask));
291 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
294 if (!ads->nsortlist) return 0;
296 ai= search_sortlist(ads,af,a);
297 bi= search_sortlist(ads,af,b);
301 static int di_inaddr(adns_state ads,
302 const void *datap_a, const void *datap_b) {
303 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
306 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
307 char buf[ADNS_ADDR2TEXT_BUFLEN];
308 int len= sizeof(buf);
312 memset(&a, 0, sizeof(a));
313 a.addr.sa.sa_family= af;
314 adns__sockaddr_inject(p, 0, &a.addr.sa);
315 err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
320 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
321 return csp_genaddr(vb, AF_INET,datap);
325 * _in6addr (pa,di,cs)
328 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
329 int max, void *datap) {
330 struct in6_addr *storeto= datap;
332 if (max-cbyte != 16) return adns_s_invaliddata;
333 memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
337 static int di_in6addr(adns_state ads,
338 const void *datap_a, const void *datap_b) {
339 return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
342 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
343 return csp_genaddr(vb,AF_INET6,datap);
347 * _addr (pap,pa,di,div,csp,cs,gsz,qs
348 * +search_sortlist_sa, dip_sockaddr, addr_rrtypes, icb_addr)
351 static const typeinfo tinfo_addrsub;
353 #define ADDR_RRTYPES(_) _(a)
355 static const adns_rrtype addr_all_rrtypes[] = {
356 #define RRTY_CODE(ty) adns_r_##ty,
357 ADDR_RRTYPES(RRTY_CODE)
362 #define RRTY_INDEX(ty) addr__ri_##ty,
363 ADDR_RRTYPES(RRTY_INDEX)
366 #define RRTY_FLAG(ty) addr_rf_##ty = 1 << addr__ri_##ty,
367 ADDR_RRTYPES(RRTY_FLAG)
372 static unsigned addr_rrtypeflag(adns_rrtype type) {
375 type &= adns_rrt_typemask;
376 for (i=0; i<addr_nrrtypes && type!=addr_all_rrtypes[i]; i++);
377 return i < addr_nrrtypes ? 1 << i : 0;
380 static adns_status pap_addr(const parseinfo *pai, int rrty, size_t rrsz,
381 int *cbyte_io, int max, adns_rr_addr *storeto) {
382 const byte *dgram= pai->dgram;
383 int af, addrlen, salen;
384 const void *oaddr= dgram + *cbyte_io;
385 int avail= max - *cbyte_io;
391 af= AF_INET; addrlen= 4;
392 addrp= &storeto->addr.inet.sin_addr;
393 salen= sizeof(storeto->addr.inet);
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);
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 adns__sockaddr_extract(sa, &a, 0);
422 return search_sortlist(ads, sa->sa_family, &a);
425 static int dip_sockaddr(adns_state ads,
426 const struct sockaddr *sa,
427 const struct sockaddr *sb) {
428 if (!ads->sortlist) return 0;
429 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
432 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
433 const adns_rr_addr *ap= datap_a, *bp= datap_b;
434 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
437 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
438 const adns_state ads= context;
440 return di_addr(ads, datap_a, datap_b);
443 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
444 char buf[ADNS_ADDR2TEXT_BUFLEN];
445 int len= sizeof(buf);
448 switch (rrp->addr.inet.sin_family) {
453 CSP_ADDSTR("INET6 ");
456 err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
460 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
467 static adns_status cs_addr(vbuf *vb, const void *datap) {
468 const adns_rr_addr *rrp= datap;
470 return csp_addr(vb,rrp);
473 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
474 return type & adns__qtf_bigaddr ?
475 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
478 static unsigned addr_rrtypes(adns_state ads, adns_rrtype type,
479 adns_queryflags qf) {
480 /* Return a mask of addr_rf_... flags indicating which address families are
481 * wanted, given a query type and flags.
486 static void icb_addr(adns_query parent, adns_query child);
488 static void addr_subqueries(adns_query qu, struct timeval now,
489 adns_queryflags qf_extra,
490 const byte *qd_dgram, int qd_dglen) {
493 adns_queryflags qf= (qu->flags & ~adns_qf_search) | qf_extra;
494 adns_rrtype qtf= qu->answer->type & adns__qtf_deref;
495 unsigned which= qu->ctx.tinfo.addr.want & ~qu->ctx.tinfo.addr.have;
498 memset(&ctx, 0, sizeof(ctx));
499 ctx.callback= icb_addr;
500 for (i=0; i<addr_nrrtypes; i++) {
501 if (!(which & (1 << i))) continue;
502 err= adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qd_dgram,qd_dglen,
503 DNS_HDRSIZE, addr_all_rrtypes[i], qf);
504 if (err) goto x_error;
505 err= adns__internal_submit(qu->ads, &cqu, qu, &tinfo_addrsub,
506 addr_all_rrtypes[i] | qtf,
507 &qu->vb, id, qf, now, &ctx);
508 if (err) goto x_error;
509 cqu->answer->rrsz= qu->answer->rrsz;
511 qu->state= query_childw;
512 LIST_LINK_TAIL(qu->ads->childw, qu);
516 adns__query_fail(qu, err);
519 static adns_status append_addrs(adns_query qu, size_t rrsz,
520 adns_rr_addr **dp, int *dlen,
521 const adns_rr_addr *sp, int slen) {
522 /* Append a vector of slen addr records, each of size rrsz, starting at ap,
523 * to a vector starting at *dp, of length *dlen. On successful completion,
524 * *dp and *dlen are updated.
527 size_t drrsz= *dlen*rrsz, srrsz= slen*rrsz;
530 if (!slen) return adns_s_ok;
531 p= adns__alloc_interim(qu, drrsz + srrsz);
534 memcpy(p, *dp, drrsz);
535 adns__free_interim(qu, *dp);
537 memcpy(p + drrsz, sp, srrsz);
539 *dp= (adns_rr_addr *)p;
543 static void propagate_ttl(adns_query to, adns_query from)
544 { if (to->expires > from->expires) to->expires= from->expires; }
546 static adns_status copy_cname_from_child(adns_query parent, adns_query child) {
547 adns_answer *pans= parent->answer, *cans= child->answer;
548 size_t n= strlen(cans->cname) + 1;
550 pans->cname= adns__alloc_preserved(parent, n);
551 if (!pans->cname) R_NOMEM;
552 memcpy(pans->cname, cans->cname, n);
556 static void done_addr_type(adns_query qu, adns_rrtype type) {
557 unsigned f= addr_rrtypeflag(type);
558 assert(f); qu->ctx.tinfo.addr.have |= f;
561 static void icb_addr(adns_query parent, adns_query child) {
562 adns_state ads= parent->ads;
563 adns_answer *pans= parent->answer, *cans= child->answer;
567 propagate_ttl(parent, child);
569 if (cans->cname && !pans->cname) {
570 err= copy_cname_from_child(parent, child);
574 if ((parent->flags & adns_qf_search) &&
575 !pans->cname && cans->status == adns_s_nxdomain) {
576 /* We're searching a list of suffixes, and the name doesn't exist. Try
580 adns__cancel_children(parent);
581 adns__free_interim(parent, pans->rrs.bytes);
582 pans->rrs.bytes= 0; pans->nrrs= 0;
583 if (gettimeofday(&now, 0)) goto x_gtod;
584 adns__search_next(ads, parent, now);
588 if (cans->status && cans->status != adns_s_nodata)
589 { err= cans->status; goto x_err; }
591 assert(pans->rrsz == cans->rrsz);
592 err= append_addrs(parent, pans->rrsz,
593 &pans->rrs.addr, &pans->nrrs,
594 cans->rrs.addr, cans->nrrs);
596 done_addr_type(parent, cans->type);
598 if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
599 else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
600 else adns__query_done(parent);
604 adns__diag(ads, -1, parent, "gettimeofday failed: %s", strerror(errno));
605 err= adns_s_systemfail;
609 adns__query_fail(parent, err);
612 static void qs_addr(adns_query qu, struct timeval now) {
613 if (!qu->ctx.tinfo.addr.want) {
614 qu->ctx.tinfo.addr.want= addr_rrtypes(qu->ads, qu->answer->type,
616 qu->ctx.tinfo.addr.have= 0;
618 addr_subqueries(qu, now, 0, qu->query_dgram, qu->query_dglen);
622 * _domain (pap,csp,cs)
626 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
627 char **domain_r, parsedomain_flags flags) {
631 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
632 pai->dgram,pai->dglen, cbyte_io, max);
634 if (!pai->qu->vb.used) return adns_s_invaliddata;
636 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
639 dm[pai->qu->vb.used]= 0;
640 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
646 static adns_status csp_domain(vbuf *vb, const char *domain) {
648 if (!*domain) CSP_ADDSTR(".");
652 static adns_status cs_domain(vbuf *vb, const void *datap) {
653 const char *const *domainp= datap;
654 return csp_domain(vb,*domainp);
657 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
658 int max, void *datap) {
662 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
665 if (cbyte != max) return adns_s_invaliddata;
673 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
674 int max, void *datap) {
678 st= pap_domain(pai, &cbyte, max, rrp,
679 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
682 if (cbyte != max) return adns_s_invaliddata;
687 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
690 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
692 int *cbyte_io, int count, int dmstart) {
694 int type, class, rdlen, rdstart, rdend, ownermatched;
698 for (rri=0, naddrs=-1; rri<count; rri++) {
699 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
700 pai->dglen, cbyte_io,
701 &type, &class, &ttl, &rdlen, &rdstart,
702 pai->dgram, pai->dglen, dmstart, &ownermatched);
704 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
705 if (naddrs>0) break; else continue;
710 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
712 adns__update_expires(pai->qu,ttl,pai->now);
713 rdend= rdstart + rdlen;
714 st= pap_addr(pai, adns_r_a, addrsz, &rdstart, rdend,
715 (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
717 if (rdstart != rdend) return adns_s_invaliddata;
721 ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
722 if (!ha->addrs) R_NOMEM;
723 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
725 ha->astatus= adns_s_ok;
727 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
733 static void icb_hostaddr(adns_query parent, adns_query child) {
734 adns_answer *cans= child->answer;
735 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
736 adns_state ads= parent->ads;
741 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
742 rrp->addrs= cans->rrs.addr;
743 adns__transfer_interim(child, parent, rrp->addrs);
745 if (parent->children.head) {
746 LIST_LINK_TAIL(ads->childw,parent);
748 adns__query_done(parent);
752 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
753 int max, adns_rr_hostaddr *rrp) {
759 adns_queryflags nflags;
760 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
762 dmstart= cbyte= *cbyte_io;
763 st= pap_domain(pai, &cbyte, max, &rrp->host,
764 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
768 rrp->astatus= adns_s_ok;
774 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
776 if (rrp->naddrs != -1) return adns_s_ok;
778 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
780 if (rrp->naddrs != -1) return adns_s_ok;
782 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
783 pai->dgram, pai->dglen, dmstart,
784 adns_r_addr, adns_qf_quoteok_query);
788 ctx.callback= icb_hostaddr;
789 ctx.pinfo.hostaddr= rrp;
790 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
792 nflags= adns_qf_quoteok_query;
793 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
795 st= adns__internal_submit(pai->ads, &nqu, pai->qu,
796 adns__findtype(adns_r_addr),
797 ((adns_r_addr & adns_rrt_reprmask) |
798 (pai->qu->answer->type & ~adns_rrt_reprmask)),
799 &pai->qu->vb, id, nflags, pai->now, &ctx);
805 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
806 int max, void *datap) {
807 adns_rr_hostaddr *rrp= datap;
810 st= pap_hostaddr(pai, &cbyte, max, rrp);
812 if (cbyte != max) return adns_s_invaliddata;
817 static int dip_hostaddr(adns_state ads,
818 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
819 if (ap->astatus != bp->astatus) return ap->astatus;
820 if (ap->astatus) return 0;
822 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
825 static int di_hostaddr(adns_state ads,
826 const void *datap_a, const void *datap_b) {
827 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
829 return dip_hostaddr(ads, ap,bp);
832 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
834 size_t addrsz= gsz_addr(0, qu->answer->type);
836 adns__makefinal_str(qu,&rrp->host);
838 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
842 static void mf_hostaddr(adns_query qu, void *datap) {
843 adns_rr_hostaddr *rrp= datap;
845 mfp_hostaddr(qu,rrp);
848 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
854 st= csp_domain(vb,rrp->host); if (st) return st;
857 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
859 sprintf(buf," %d ",rrp->astatus);
862 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
865 errstr= adns_strerror(rrp->astatus);
866 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
868 if (rrp->naddrs >= 0) {
870 for (i=0; i<rrp->naddrs; i++) {
872 st= csp_addr(vb,&rrp->addrs[i]);
881 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
882 const adns_rr_hostaddr *rrp= datap;
884 return csp_hostaddr(vb,rrp);
891 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
892 int max, void *datap) {
893 const byte *dgram= pai->dgram;
894 adns_rr_intstr *rrp= datap;
898 if (cbyte+2 > max) return adns_s_invaliddata;
901 st= pap_domain(pai, &cbyte, max, &rrp->str,
902 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
905 if (cbyte != max) return adns_s_invaliddata;
909 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
910 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
912 if (ap->i < bp->i) return 0;
913 if (ap->i > bp->i) return 1;
921 static adns_status pa_mx(const parseinfo *pai, int cbyte,
922 int max, void *datap) {
923 const byte *dgram= pai->dgram;
924 adns_rr_inthostaddr *rrp= datap;
928 if (cbyte+2 > max) return adns_s_invaliddata;
931 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
934 if (cbyte != max) return adns_s_invaliddata;
938 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
939 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
941 if (ap->i < bp->i) return 0;
942 if (ap->i > bp->i) return 1;
943 return dip_hostaddr(ads, &ap->ha, &bp->ha);
947 * _inthostaddr (mf,cs)
950 static void mf_inthostaddr(adns_query qu, void *datap) {
951 adns_rr_inthostaddr *rrp= datap;
953 mfp_hostaddr(qu,&rrp->ha);
956 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
957 const adns_rr_inthostaddr *rrp= datap;
960 sprintf(buf,"%u ",rrp->i);
963 return csp_hostaddr(vb,&rrp->ha);
970 static adns_status cs_inthost(vbuf *vb, const void *datap) {
971 const adns_rr_intstr *rrp= datap;
974 sprintf(buf,"%u ",rrp->i);
976 return csp_domain(vb,rrp->str);
980 * _ptr (ckl,pa +icb_ptr)
983 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
984 union checklabel_state *cls, qcontext *ctx,
985 int labnum, const char *label, int lablen) {
987 if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
988 return adns_s_querydomainwrong;
990 if (adns__revparse_done(&cls->ptr, labnum,
991 &ctx->tinfo.ptr.rev_rrtype,
992 &ctx->tinfo.ptr.addr))
993 return adns_s_querydomainwrong;
998 static void icb_ptr(adns_query parent, adns_query child) {
999 adns_answer *cans= child->answer;
1000 const struct af_addr *queried;
1001 const unsigned char *found;
1002 adns_state ads= parent->ads;
1005 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1006 adns__query_fail(parent,adns_s_inconsistent);
1008 } else if (cans->status) {
1009 adns__query_fail(parent,cans->status);
1013 queried= &parent->ctx.tinfo.ptr.addr;
1014 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
1015 if (adns__genaddr_equal_p(queried->af,&queried->addr,
1016 parent->ctx.tinfo.ptr.addr.af,found)) {
1017 if (!parent->children.head) {
1018 adns__query_done(parent);
1021 LIST_LINK_TAIL(ads->childw,parent);
1027 adns__query_fail(parent,adns_s_inconsistent);
1030 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1031 int max, void *datap) {
1034 adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
1040 st= pap_domain(pai, &cbyte, max, rrp,
1041 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1043 if (cbyte != max) return adns_s_invaliddata;
1045 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1046 pai->dgram, pai->dglen, dmstart,
1047 rrtype, adns_qf_quoteok_query);
1051 ctx.callback= icb_ptr;
1052 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
1053 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
1054 st= adns__internal_submit(pai->ads, &nqu, pai->qu,
1055 adns__findtype(rrtype),
1056 rrtype, &pai->qu->vb, id,
1057 adns_qf_quoteok_query, pai->now, &ctx);
1067 static void mf_strpair(adns_query qu, void *datap) {
1068 adns_rr_strpair *rrp= datap;
1070 adns__makefinal_str(qu,&rrp->array[0]);
1071 adns__makefinal_str(qu,&rrp->array[1]);
1078 static void mf_intstrpair(adns_query qu, void *datap) {
1079 adns_rr_intstrpair *rrp= datap;
1081 adns__makefinal_str(qu,&rrp->array[0].str);
1082 adns__makefinal_str(qu,&rrp->array[1].str);
1089 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1090 int max, void *datap) {
1091 adns_rr_intstrpair *rrp= datap;
1095 for (i=0; i<2; i++) {
1096 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1100 if (cbyte != max) return adns_s_invaliddata;
1106 * _mailbox (pap,cs +pap_mailbox822)
1109 static adns_status pap_mailbox822(const parseinfo *pai,
1110 int *cbyte_io, int max, char **mb_r) {
1111 int lablen, labstart, i, needquote, c, r, neednorm;
1112 const unsigned char *p;
1114 findlabel_state fls;
1120 adns__findlabel_start(&fls, pai->ads,
1122 pai->dgram, pai->dglen, max,
1123 *cbyte_io, cbyte_io);
1124 st= adns__findlabel_next(&fls,&lablen,&labstart);
1126 adns__vbuf_appendstr(vb,".");
1131 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1133 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1134 if (c == '.' && !neednorm) neednorm= 1;
1135 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1139 if (needquote || neednorm) {
1140 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1141 adns__vbuf_appendq(vb,"\"",1);
1142 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1144 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1145 adns__vbuf_appendq(vb,p,1);
1147 adns__vbuf_appendq(vb,"\"",1);
1149 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1152 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1154 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1158 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1159 memcpy(str,vb->buf,vb->used);
1165 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1167 if (pai->qu->typei->typekey & adns__qtf_mail822) {
1168 return pap_mailbox822(pai, cbyte_io, max, mb_r);
1170 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1174 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1175 return csp_domain(vb,mailbox);
1182 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1183 int max, void *datap) {
1184 adns_rr_strpair *rrp= datap;
1187 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1190 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1193 if (cbyte != max) return adns_s_invaliddata;
1197 static adns_status cs_rp(vbuf *vb, const void *datap) {
1198 const adns_rr_strpair *rrp= datap;
1201 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
1203 st= csp_domain(vb,rrp->array[1]); if (st) return st;
1212 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1213 int max, void *datap) {
1214 adns_rr_soa *rrp= datap;
1215 const byte *dgram= pai->dgram;
1219 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1220 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1223 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1226 if (cbyte+20 != max) return adns_s_invaliddata;
1228 for (i=0; i<5; i++) {
1231 (&rrp->serial)[i]= (msw<<16) | lsw;
1237 static void mf_soa(adns_query qu, void *datap) {
1238 adns_rr_soa *rrp= datap;
1240 adns__makefinal_str(qu,&rrp->mname);
1241 adns__makefinal_str(qu,&rrp->rname);
1244 static adns_status cs_soa(vbuf *vb, const void *datap) {
1245 const adns_rr_soa *rrp= datap;
1250 st= csp_domain(vb,rrp->mname); if (st) return st;
1252 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1254 for (i=0; i<5; i++) {
1255 sprintf(buf," %lu",(&rrp->serial)[i]);
1263 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1266 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1267 union checklabel_state *cls, qcontext *ctx,
1268 int labnum, const char *label, int lablen) {
1269 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1270 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1273 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1276 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1278 /* might be adns_rr_srvraw* */) {
1279 const byte *dgram= pai->dgram;
1283 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1285 rrp->priority= GET_W(cbyte, ti);
1286 rrp->weight= GET_W(cbyte, ti);
1287 rrp->port= GET_W(cbyte, ti);
1291 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1292 int max, void *datap) {
1293 adns_rr_srvraw *rrp= datap;
1296 st= pap_srv_begin(pai,&cbyte,max,datap);
1299 st= pap_domain(pai, &cbyte, max, &rrp->host,
1300 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1303 if (cbyte != max) return adns_s_invaliddata;
1307 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1308 int max, void *datap) {
1309 adns_rr_srvha *rrp= datap;
1312 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1313 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1314 if (cbyte != max) return adns_s_invaliddata;
1318 static void mf_srvraw(adns_query qu, void *datap) {
1319 adns_rr_srvraw *rrp= datap;
1320 adns__makefinal_str(qu, &rrp->host);
1323 static void mf_srvha(adns_query qu, void *datap) {
1324 adns_rr_srvha *rrp= datap;
1325 mfp_hostaddr(qu,&rrp->ha);
1328 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1329 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1330 /* might be const adns_rr_svhostaddr* */
1332 if (ap->priority < bp->priority) return 0;
1333 if (ap->priority > bp->priority) return 1;
1337 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1338 /* might be adns_rr_srvraw* */) {
1340 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1345 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1346 const adns_rr_srvraw *rrp= datap;
1349 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1350 return csp_domain(vb,rrp->host);
1353 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1354 const adns_rr_srvha *rrp= datap;
1357 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1358 return csp_hostaddr(vb,&rrp->ha);
1361 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1362 const struct typeinfo *typei) {
1363 /* we treat everything in the array as if it were an adns_rr_srvha
1364 * even though the array might be of adns_rr_srvraw. That's OK
1365 * because they have the same prefix, which is all we access.
1366 * We use rrsz, too, rather than naive array indexing, of course.
1368 char *workbegin, *workend, *search, *arrayend;
1369 const adns_rr_srvha *rr;
1370 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1371 int cpriority, totalweight, runtotal;
1374 assert(rrsz <= sizeof(rrtmp));
1375 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1376 workbegin < arrayend;
1377 workbegin= workend) {
1378 cpriority= (rr=(void*)workbegin)->priority;
1380 for (workend= workbegin, totalweight= 0;
1381 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1383 totalweight += rr->weight;
1386 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1387 * cpriority. From now on, workbegin points to the `remaining'
1388 * records: we select one record at a time (RFC2782 `Usage rules'
1389 * and `Format of the SRV RR' subsection `Weight') to place at
1390 * workbegin (swapping with the one that was there, and then
1391 * advance workbegin. */
1393 workbegin + rrsz < workend; /* don't bother if just one */
1394 workbegin += rrsz) {
1396 randval= nrand48(ads->rand48xsubi);
1397 randval %= (totalweight + 1);
1398 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1399 * totalweight must be <= 2^26 so probability nonuniformity is
1400 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1401 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1404 for (search=workbegin, runtotal=0;
1405 (runtotal += (rr=(void*)search)->weight) < randval;
1407 assert(search < arrayend);
1408 totalweight -= rr->weight;
1409 if (search != workbegin) {
1410 memcpy(&rrtmp, workbegin, rrsz);
1411 memcpy(workbegin, search, rrsz);
1412 memcpy(search, &rrtmp, rrsz);
1417 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1418 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1419 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1427 static void mf_byteblock(adns_query qu, void *datap) {
1428 adns_rr_byteblock *rrp= datap;
1429 void *bytes= rrp->data;
1430 adns__makefinal_block(qu,&bytes,rrp->len);
1438 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1439 int max, void *datap) {
1440 adns_rr_byteblock *rrp= datap;
1442 rrp->len= max - cbyte;
1443 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1444 if (!rrp->data) R_NOMEM;
1445 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1449 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1450 const adns_rr_byteblock *rrp= datap;
1455 sprintf(buf,"\\# %d",rrp->len);
1458 for (l= rrp->len, p= rrp->data;
1461 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1467 sprintf(buf," %02x",*p);
1477 static void mf_flat(adns_query qu, void *data) { }
1483 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1485 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1486 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1487 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1488 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1490 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1491 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1492 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1493 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1498 static const typeinfo typeinfos[] = {
1499 /* Must be in ascending order of rrtype ! */
1500 /* mem-mgmt code rrt fmt member parser comparer printer */
1502 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1503 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1504 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1505 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1506 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1507 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1508 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1509 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1510 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1511 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, in6addr, in6addr,in6addr ),
1512 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1513 .checklabel= ckl_srv, .postsort= postsort_srv),
1515 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1516 .getrrsz= gsz_addr, .query_send= qs_addr),
1517 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1518 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1519 .checklabel= ckl_ptr),
1520 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1521 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1522 .checklabel= ckl_srv, .postsort= postsort_srv),
1524 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1525 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1528 static const typeinfo tinfo_addrsub =
1529 FLAT_TYPE(none, "<addr>","sub",addr, addr, 0, addr,
1530 .getrrsz= gsz_addr);
1532 static const typeinfo typeinfo_unknown=
1533 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1535 const typeinfo *adns__findtype(adns_rrtype type) {
1536 const typeinfo *begin, *end, *mid;
1538 if (type & adns_r_unknown) return &typeinfo_unknown;
1539 type &= adns_rrt_reprmask;
1541 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1543 while (begin < end) {
1544 mid= begin + ((end-begin)>>1);
1545 if (mid->typekey == type) return mid;
1546 if (type > mid->typekey) begin= mid+1;