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_sortlist_sa, dip_sockaddr,
56 * addr_rrtypes, addr_submit, 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,
349 * addr_submit, icb_addr)
352 static const typeinfo tinfo_addrsub;
354 #define ADDR_RRTYPES(_) _(a) _(aaaa)
356 static const adns_rrtype addr_all_rrtypes[] = {
357 #define RRTY_CODE(ty) adns_r_##ty,
358 ADDR_RRTYPES(RRTY_CODE)
363 #define RRTY_INDEX(ty) addr__ri_##ty,
364 ADDR_RRTYPES(RRTY_INDEX)
367 #define RRTY_FLAG(ty) addr_rf_##ty = 1 << addr__ri_##ty,
368 ADDR_RRTYPES(RRTY_FLAG)
373 static unsigned addr_rrtypeflag(adns_rrtype type) {
376 type &= adns_rrt_typemask;
377 for (i=0; i<addr_nrrtypes && type!=addr_all_rrtypes[i]; i++);
378 return i < addr_nrrtypes ? 1 << i : 0;
381 static adns_status pap_addr(const parseinfo *pai, int rrty, size_t rrsz,
382 int *cbyte_io, int max, adns_rr_addr *storeto) {
383 const byte *dgram= pai->dgram;
384 int af, addrlen, salen;
385 const void *oaddr= dgram + *cbyte_io;
386 int avail= max - *cbyte_io;
392 af= AF_INET; addrlen= 4;
393 addrp= &storeto->addr.inet.sin_addr;
394 salen= sizeof(storeto->addr.inet);
399 assert(offsetof(adns_rr_addr, addr) + salen <= rrsz);
400 if (addrlen < avail) return adns_s_invaliddata;
401 if (step < 0) step= addrlen;
403 memset(&storeto->addr, 0, salen);
405 storeto->addr.sa.sa_family= af;
406 memcpy(addrp, oaddr, addrlen);
411 static adns_status pa_addr(const parseinfo *pai, int cbyte,
412 int max, void *datap) {
413 int err= pap_addr(pai, pai->qu->answer->type & adns_rrt_typemask,
414 pai->qu->answer->rrsz, &cbyte, max, datap);
416 if (cbyte != max) return adns_s_invaliddata;
420 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
422 adns__sockaddr_extract(sa, &a, 0);
423 return search_sortlist(ads, sa->sa_family, &a);
426 static int dip_sockaddr(adns_state ads,
427 const struct sockaddr *sa,
428 const struct sockaddr *sb) {
429 if (!ads->sortlist) return 0;
430 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
433 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
434 const adns_rr_addr *ap= datap_a, *bp= datap_b;
435 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
438 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
439 const adns_state ads= context;
441 return di_addr(ads, datap_a, datap_b);
444 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
445 char buf[ADNS_ADDR2TEXT_BUFLEN];
446 int len= sizeof(buf);
449 switch (rrp->addr.inet.sin_family) {
454 CSP_ADDSTR("INET6 ");
457 err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
461 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
468 static adns_status cs_addr(vbuf *vb, const void *datap) {
469 const adns_rr_addr *rrp= datap;
471 return csp_addr(vb,rrp);
474 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
475 return type & adns__qtf_bigaddr ?
476 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
479 static unsigned addr_rrtypes(adns_state ads, adns_rrtype type,
480 adns_queryflags qf) {
481 /* Return a mask of addr_rf_... flags indicating which address families are
482 * wanted, given a query type and flags.
487 static void icb_addr(adns_query parent, adns_query child);
489 static void addr_subqueries(adns_query qu, struct timeval now,
490 adns_queryflags qf_extra,
491 const byte *qd_dgram, int qd_dglen) {
494 adns_queryflags qf= (qu->flags & ~adns_qf_search) | qf_extra;
495 adns_rrtype qtf= qu->answer->type & adns__qtf_deref;
496 unsigned which= qu->ctx.tinfo.addr.want & ~qu->ctx.tinfo.addr.have;
499 memset(&ctx, 0, sizeof(ctx));
500 ctx.callback= icb_addr;
501 for (i=0; i<addr_nrrtypes; i++) {
502 if (!(which & (1 << i))) continue;
503 err= adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qd_dgram,qd_dglen,
504 DNS_HDRSIZE, addr_all_rrtypes[i], qf);
505 if (err) goto x_error;
506 err= adns__internal_submit(qu->ads, &cqu, qu, &tinfo_addrsub,
507 addr_all_rrtypes[i] | qtf,
508 &qu->vb, id, qf, now, &ctx);
509 if (err) goto x_error;
510 cqu->answer->rrsz= qu->answer->rrsz;
512 qu->state= query_childw;
513 LIST_LINK_TAIL(qu->ads->childw, qu);
517 adns__query_fail(qu, err);
520 static adns_status addr_submit(adns_query parent, adns_query *query_r,
521 vbuf *qumsg_vb, int id, unsigned want,
522 adns_queryflags flags, struct timeval now,
524 /* This is effectively a substitute for adns__internal_submit, intended for
525 * the case where the caller (possibly) only wants a subset of the
526 * available record types. The memory management and callback rules are
527 * the same as for adns__internal_submit.
529 * Some differences: the query is linked onto the parent's children list
530 * before exit (though the parent's state is not changed, and it is not
531 * linked into the childw list queue); and we fiddle with the `tinfo'
532 * portion of the context structure (yes, modifying *ctx), since this is,
533 * in fact, the main purpose of this function.
536 adns_state ads= parent->ads;
539 adns_rrtype type= ((adns_r_addr & adns_rrt_reprmask) |
540 (parent->answer->type & ~adns_rrt_reprmask));
542 ctx->tinfo.addr.want= want;
543 ctx->tinfo.addr.have= 0;
544 err= adns__internal_submit(ads, &qu, parent, adns__findtype(adns_r_addr),
545 type, qumsg_vb, id, flags, now, ctx);
552 static adns_status append_addrs(adns_query qu, size_t rrsz,
553 adns_rr_addr **dp, int *dlen,
554 const adns_rr_addr *sp, int slen) {
555 /* Append a vector of slen addr records, each of size rrsz, starting at ap,
556 * to a vector starting at *dp, of length *dlen. On successful completion,
557 * *dp and *dlen are updated.
560 size_t drrsz= *dlen*rrsz, srrsz= slen*rrsz;
563 if (!slen) return adns_s_ok;
564 p= adns__alloc_interim(qu, drrsz + srrsz);
567 memcpy(p, *dp, drrsz);
568 adns__free_interim(qu, *dp);
570 memcpy(p + drrsz, sp, srrsz);
572 *dp= (adns_rr_addr *)p;
576 static void propagate_ttl(adns_query to, adns_query from)
577 { if (to->expires > from->expires) to->expires= from->expires; }
579 static adns_status copy_cname_from_child(adns_query parent, adns_query child) {
580 adns_answer *pans= parent->answer, *cans= child->answer;
581 size_t n= strlen(cans->cname) + 1;
583 pans->cname= adns__alloc_preserved(parent, n);
584 if (!pans->cname) R_NOMEM;
585 memcpy(pans->cname, cans->cname, n);
589 static void done_addr_type(adns_query qu, adns_rrtype type) {
590 unsigned f= addr_rrtypeflag(type);
591 assert(f); qu->ctx.tinfo.addr.have |= f;
594 static void icb_addr(adns_query parent, adns_query child) {
595 adns_state ads= parent->ads;
596 adns_answer *pans= parent->answer, *cans= child->answer;
600 propagate_ttl(parent, child);
602 if (cans->cname && !pans->cname) {
603 err= copy_cname_from_child(parent, child);
607 if ((parent->flags & adns_qf_search) &&
608 !pans->cname && cans->status == adns_s_nxdomain) {
609 /* We're searching a list of suffixes, and the name doesn't exist. Try
613 adns__cancel_children(parent);
614 adns__free_interim(parent, pans->rrs.bytes);
615 pans->rrs.bytes= 0; pans->nrrs= 0;
616 if (gettimeofday(&now, 0)) goto x_gtod;
617 adns__search_next(ads, parent, now);
621 if (cans->status && cans->status != adns_s_nodata)
622 { err= cans->status; goto x_err; }
624 assert(pans->rrsz == cans->rrsz);
625 err= append_addrs(parent, pans->rrsz,
626 &pans->rrs.addr, &pans->nrrs,
627 cans->rrs.addr, cans->nrrs);
629 done_addr_type(parent, cans->type);
631 if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
632 else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
633 else adns__query_done(parent);
637 adns__diag(ads, -1, parent, "gettimeofday failed: %s", strerror(errno));
638 err= adns_s_systemfail;
642 adns__query_fail(parent, err);
645 static void qs_addr(adns_query qu, struct timeval now) {
646 if (!qu->ctx.tinfo.addr.want) {
647 qu->ctx.tinfo.addr.want= addr_rrtypes(qu->ads, qu->answer->type,
649 qu->ctx.tinfo.addr.have= 0;
651 addr_subqueries(qu, now, 0, qu->query_dgram, qu->query_dglen);
655 * _domain (pap,csp,cs)
659 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
660 char **domain_r, parsedomain_flags flags) {
664 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
665 pai->dgram,pai->dglen, cbyte_io, max);
667 if (!pai->qu->vb.used) return adns_s_invaliddata;
669 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
672 dm[pai->qu->vb.used]= 0;
673 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
679 static adns_status csp_domain(vbuf *vb, const char *domain) {
681 if (!*domain) CSP_ADDSTR(".");
685 static adns_status cs_domain(vbuf *vb, const void *datap) {
686 const char *const *domainp= datap;
687 return csp_domain(vb,*domainp);
690 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
691 int max, void *datap) {
695 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
698 if (cbyte != max) return adns_s_invaliddata;
706 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
707 int max, void *datap) {
711 st= pap_domain(pai, &cbyte, max, rrp,
712 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
715 if (cbyte != max) return adns_s_invaliddata;
720 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
723 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
724 unsigned *want_io, size_t addrsz,
725 int *cbyte_io, int count, int dmstart) {
727 unsigned typef, want= *want_io, need= want;
728 int type, class, rdlen, rdend, rdstart, ownermatched;
732 for (rri=0, naddrs=0; rri<count; rri++) {
733 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
734 pai->dglen, cbyte_io,
735 &type, &class, &ttl, &rdlen, &rdstart,
736 pai->dgram, pai->dglen, dmstart, &ownermatched);
738 if (!ownermatched || class != DNS_CLASS_IN) continue;
739 typef= addr_rrtypeflag(type);
740 if (!(want & typef)) continue;
742 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) R_NOMEM;
743 adns__update_expires(pai->qu,ttl,pai->now);
744 rdend= rdstart + rdlen;
745 st= pap_addr(pai, type, addrsz, &rdstart, rdend,
746 (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
748 if (rdstart != rdend) return adns_s_invaliddata;
752 st= append_addrs(pai->qu, addrsz, &ha->addrs, &ha->naddrs,
753 (const adns_rr_addr *)pai->qu->vb.buf, naddrs);
755 ha->astatus= adns_s_ok;
758 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
766 static void icb_hostaddr(adns_query parent, adns_query child) {
767 adns_answer *cans= child->answer;
768 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
769 adns_state ads= parent->ads;
771 size_t addrsz= gsz_addr(0, parent->answer->type);
773 st= cans->status == adns_s_nodata ? adns_s_ok : cans->status;
775 propagate_ttl(parent, child);
777 assert(addrsz == cans->rrsz);
778 st= append_addrs(parent, addrsz,
779 &rrp->addrs, &rrp->naddrs,
780 cans->rrs.addr, cans->nrrs);
782 if (!rrp->naddrs) { st= adns_s_nodata; goto done; }
784 if (!adns__vbuf_ensure(&parent->vb, addrsz))
785 { st= adns_s_nomemory; goto done; }
786 adns__isort(rrp->addrs, rrp->naddrs, addrsz, parent->vb.buf,
791 adns__free_interim(parent, rrp->addrs);
792 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : 0;
796 if (parent->children.head) {
797 LIST_LINK_TAIL(ads->childw,parent);
799 adns__query_done(parent);
803 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
804 int max, adns_rr_hostaddr *rrp) {
810 adns_queryflags nflags;
812 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
814 dmstart= cbyte= *cbyte_io;
815 st= pap_domain(pai, &cbyte, max, &rrp->host,
816 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
820 rrp->astatus= adns_s_ok;
826 want= addr_rrtypes(pai->ads, pai->qu->answer->type, pai->qu->flags);
828 st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->nscount, dmstart);
830 if (!want) return adns_s_ok;
832 st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->arcount, dmstart);
834 if (!want) return adns_s_ok;
836 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
837 pai->dgram, pai->dglen, dmstart,
838 adns_r_addr, adns_qf_quoteok_query);
842 ctx.callback= icb_hostaddr;
843 ctx.pinfo.hostaddr= rrp;
845 nflags= adns_qf_quoteok_query;
846 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
848 st= addr_submit(pai->qu, &nqu, &pai->qu->vb, id, want,
849 nflags, pai->now, &ctx);
855 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
856 int max, void *datap) {
857 adns_rr_hostaddr *rrp= datap;
860 st= pap_hostaddr(pai, &cbyte, max, rrp);
862 if (cbyte != max) return adns_s_invaliddata;
867 static int dip_hostaddr(adns_state ads,
868 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
869 if (ap->astatus != bp->astatus) return ap->astatus;
870 if (ap->astatus) return 0;
872 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
875 static int di_hostaddr(adns_state ads,
876 const void *datap_a, const void *datap_b) {
877 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
879 return dip_hostaddr(ads, ap,bp);
882 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
884 size_t addrsz= gsz_addr(0, qu->answer->type);
886 adns__makefinal_str(qu,&rrp->host);
888 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
892 static void mf_hostaddr(adns_query qu, void *datap) {
893 adns_rr_hostaddr *rrp= datap;
895 mfp_hostaddr(qu,rrp);
898 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
904 st= csp_domain(vb,rrp->host); if (st) return st;
907 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
909 sprintf(buf," %d ",rrp->astatus);
912 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
915 errstr= adns_strerror(rrp->astatus);
916 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
918 if (rrp->naddrs >= 0) {
920 for (i=0; i<rrp->naddrs; i++) {
922 st= csp_addr(vb,&rrp->addrs[i]);
931 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
932 const adns_rr_hostaddr *rrp= datap;
934 return csp_hostaddr(vb,rrp);
941 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
942 int max, void *datap) {
943 const byte *dgram= pai->dgram;
944 adns_rr_intstr *rrp= datap;
948 if (cbyte+2 > max) return adns_s_invaliddata;
951 st= pap_domain(pai, &cbyte, max, &rrp->str,
952 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
955 if (cbyte != max) return adns_s_invaliddata;
959 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
960 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
962 if (ap->i < bp->i) return 0;
963 if (ap->i > bp->i) return 1;
971 static adns_status pa_mx(const parseinfo *pai, int cbyte,
972 int max, void *datap) {
973 const byte *dgram= pai->dgram;
974 adns_rr_inthostaddr *rrp= datap;
978 if (cbyte+2 > max) return adns_s_invaliddata;
981 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
984 if (cbyte != max) return adns_s_invaliddata;
988 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
989 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
991 if (ap->i < bp->i) return 0;
992 if (ap->i > bp->i) return 1;
993 return dip_hostaddr(ads, &ap->ha, &bp->ha);
997 * _inthostaddr (mf,cs)
1000 static void mf_inthostaddr(adns_query qu, void *datap) {
1001 adns_rr_inthostaddr *rrp= datap;
1003 mfp_hostaddr(qu,&rrp->ha);
1006 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
1007 const adns_rr_inthostaddr *rrp= datap;
1010 sprintf(buf,"%u ",rrp->i);
1013 return csp_hostaddr(vb,&rrp->ha);
1020 static adns_status cs_inthost(vbuf *vb, const void *datap) {
1021 const adns_rr_intstr *rrp= datap;
1024 sprintf(buf,"%u ",rrp->i);
1026 return csp_domain(vb,rrp->str);
1030 * _ptr (ckl,pa +icb_ptr)
1033 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
1034 union checklabel_state *cls, qcontext *ctx,
1035 int labnum, const char *label, int lablen) {
1037 if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
1038 return adns_s_querydomainwrong;
1040 if (adns__revparse_done(&cls->ptr, labnum,
1041 &ctx->tinfo.ptr.rev_rrtype,
1042 &ctx->tinfo.ptr.addr))
1043 return adns_s_querydomainwrong;
1048 static void icb_ptr(adns_query parent, adns_query child) {
1049 adns_answer *cans= child->answer;
1050 const struct af_addr *queried;
1051 const unsigned char *found;
1052 adns_state ads= parent->ads;
1055 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1056 adns__query_fail(parent,adns_s_inconsistent);
1058 } else if (cans->status) {
1059 adns__query_fail(parent,cans->status);
1063 queried= &parent->ctx.tinfo.ptr.addr;
1064 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
1065 if (adns__genaddr_equal_p(queried->af,&queried->addr,
1066 parent->ctx.tinfo.ptr.addr.af,found)) {
1067 if (!parent->children.head) {
1068 adns__query_done(parent);
1071 LIST_LINK_TAIL(ads->childw,parent);
1077 adns__query_fail(parent,adns_s_inconsistent);
1080 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1081 int max, void *datap) {
1084 adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
1090 st= pap_domain(pai, &cbyte, max, rrp,
1091 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1093 if (cbyte != max) return adns_s_invaliddata;
1095 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1096 pai->dgram, pai->dglen, dmstart,
1097 rrtype, adns_qf_quoteok_query);
1101 ctx.callback= icb_ptr;
1102 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
1103 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
1104 st= adns__internal_submit(pai->ads, &nqu, pai->qu,
1105 adns__findtype(rrtype),
1106 rrtype, &pai->qu->vb, id,
1107 adns_qf_quoteok_query, pai->now, &ctx);
1117 static void mf_strpair(adns_query qu, void *datap) {
1118 adns_rr_strpair *rrp= datap;
1120 adns__makefinal_str(qu,&rrp->array[0]);
1121 adns__makefinal_str(qu,&rrp->array[1]);
1128 static void mf_intstrpair(adns_query qu, void *datap) {
1129 adns_rr_intstrpair *rrp= datap;
1131 adns__makefinal_str(qu,&rrp->array[0].str);
1132 adns__makefinal_str(qu,&rrp->array[1].str);
1139 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1140 int max, void *datap) {
1141 adns_rr_intstrpair *rrp= datap;
1145 for (i=0; i<2; i++) {
1146 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1150 if (cbyte != max) return adns_s_invaliddata;
1156 * _mailbox (pap,cs +pap_mailbox822)
1159 static adns_status pap_mailbox822(const parseinfo *pai,
1160 int *cbyte_io, int max, char **mb_r) {
1161 int lablen, labstart, i, needquote, c, r, neednorm;
1162 const unsigned char *p;
1164 findlabel_state fls;
1170 adns__findlabel_start(&fls, pai->ads,
1172 pai->dgram, pai->dglen, max,
1173 *cbyte_io, cbyte_io);
1174 st= adns__findlabel_next(&fls,&lablen,&labstart);
1176 adns__vbuf_appendstr(vb,".");
1181 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1183 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1184 if (c == '.' && !neednorm) neednorm= 1;
1185 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1189 if (needquote || neednorm) {
1190 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1191 adns__vbuf_appendq(vb,"\"",1);
1192 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1194 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1195 adns__vbuf_appendq(vb,p,1);
1197 adns__vbuf_appendq(vb,"\"",1);
1199 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1202 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1204 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1208 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1209 memcpy(str,vb->buf,vb->used);
1215 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1217 if (pai->qu->typei->typekey & adns__qtf_mail822) {
1218 return pap_mailbox822(pai, cbyte_io, max, mb_r);
1220 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1224 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1225 return csp_domain(vb,mailbox);
1232 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1233 int max, void *datap) {
1234 adns_rr_strpair *rrp= datap;
1237 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1240 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1243 if (cbyte != max) return adns_s_invaliddata;
1247 static adns_status cs_rp(vbuf *vb, const void *datap) {
1248 const adns_rr_strpair *rrp= datap;
1251 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
1253 st= csp_domain(vb,rrp->array[1]); if (st) return st;
1262 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1263 int max, void *datap) {
1264 adns_rr_soa *rrp= datap;
1265 const byte *dgram= pai->dgram;
1269 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1270 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1273 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1276 if (cbyte+20 != max) return adns_s_invaliddata;
1278 for (i=0; i<5; i++) {
1281 (&rrp->serial)[i]= (msw<<16) | lsw;
1287 static void mf_soa(adns_query qu, void *datap) {
1288 adns_rr_soa *rrp= datap;
1290 adns__makefinal_str(qu,&rrp->mname);
1291 adns__makefinal_str(qu,&rrp->rname);
1294 static adns_status cs_soa(vbuf *vb, const void *datap) {
1295 const adns_rr_soa *rrp= datap;
1300 st= csp_domain(vb,rrp->mname); if (st) return st;
1302 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1304 for (i=0; i<5; i++) {
1305 sprintf(buf," %lu",(&rrp->serial)[i]);
1313 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1316 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1317 union checklabel_state *cls, qcontext *ctx,
1318 int labnum, const char *label, int lablen) {
1319 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1320 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1323 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1326 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1328 /* might be adns_rr_srvraw* */) {
1329 const byte *dgram= pai->dgram;
1333 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1335 rrp->priority= GET_W(cbyte, ti);
1336 rrp->weight= GET_W(cbyte, ti);
1337 rrp->port= GET_W(cbyte, ti);
1341 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1342 int max, void *datap) {
1343 adns_rr_srvraw *rrp= datap;
1346 st= pap_srv_begin(pai,&cbyte,max,datap);
1349 st= pap_domain(pai, &cbyte, max, &rrp->host,
1350 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1353 if (cbyte != max) return adns_s_invaliddata;
1357 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1358 int max, void *datap) {
1359 adns_rr_srvha *rrp= datap;
1362 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1363 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1364 if (cbyte != max) return adns_s_invaliddata;
1368 static void mf_srvraw(adns_query qu, void *datap) {
1369 adns_rr_srvraw *rrp= datap;
1370 adns__makefinal_str(qu, &rrp->host);
1373 static void mf_srvha(adns_query qu, void *datap) {
1374 adns_rr_srvha *rrp= datap;
1375 mfp_hostaddr(qu,&rrp->ha);
1378 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1379 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1380 /* might be const adns_rr_svhostaddr* */
1382 if (ap->priority < bp->priority) return 0;
1383 if (ap->priority > bp->priority) return 1;
1387 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1388 /* might be adns_rr_srvraw* */) {
1390 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1395 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1396 const adns_rr_srvraw *rrp= datap;
1399 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1400 return csp_domain(vb,rrp->host);
1403 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1404 const adns_rr_srvha *rrp= datap;
1407 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1408 return csp_hostaddr(vb,&rrp->ha);
1411 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1412 const struct typeinfo *typei) {
1413 /* we treat everything in the array as if it were an adns_rr_srvha
1414 * even though the array might be of adns_rr_srvraw. That's OK
1415 * because they have the same prefix, which is all we access.
1416 * We use rrsz, too, rather than naive array indexing, of course.
1418 char *workbegin, *workend, *search, *arrayend;
1419 const adns_rr_srvha *rr;
1420 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1421 int cpriority, totalweight, runtotal;
1424 assert(rrsz <= sizeof(rrtmp));
1425 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1426 workbegin < arrayend;
1427 workbegin= workend) {
1428 cpriority= (rr=(void*)workbegin)->priority;
1430 for (workend= workbegin, totalweight= 0;
1431 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1433 totalweight += rr->weight;
1436 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1437 * cpriority. From now on, workbegin points to the `remaining'
1438 * records: we select one record at a time (RFC2782 `Usage rules'
1439 * and `Format of the SRV RR' subsection `Weight') to place at
1440 * workbegin (swapping with the one that was there, and then
1441 * advance workbegin. */
1443 workbegin + rrsz < workend; /* don't bother if just one */
1444 workbegin += rrsz) {
1446 randval= nrand48(ads->rand48xsubi);
1447 randval %= (totalweight + 1);
1448 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1449 * totalweight must be <= 2^26 so probability nonuniformity is
1450 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1451 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1454 for (search=workbegin, runtotal=0;
1455 (runtotal += (rr=(void*)search)->weight) < randval;
1457 assert(search < arrayend);
1458 totalweight -= rr->weight;
1459 if (search != workbegin) {
1460 memcpy(&rrtmp, workbegin, rrsz);
1461 memcpy(workbegin, search, rrsz);
1462 memcpy(search, &rrtmp, rrsz);
1467 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1468 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1469 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1477 static void mf_byteblock(adns_query qu, void *datap) {
1478 adns_rr_byteblock *rrp= datap;
1479 void *bytes= rrp->data;
1480 adns__makefinal_block(qu,&bytes,rrp->len);
1488 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1489 int max, void *datap) {
1490 adns_rr_byteblock *rrp= datap;
1492 rrp->len= max - cbyte;
1493 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1494 if (!rrp->data) R_NOMEM;
1495 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1499 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1500 const adns_rr_byteblock *rrp= datap;
1505 sprintf(buf,"\\# %d",rrp->len);
1508 for (l= rrp->len, p= rrp->data;
1511 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1517 sprintf(buf," %02x",*p);
1527 static void mf_flat(adns_query qu, void *data) { }
1533 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1535 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1536 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1537 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1538 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1540 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1541 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1542 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1543 adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send, \
1548 static const typeinfo typeinfos[] = {
1549 /* Must be in ascending order of rrtype ! */
1550 /* mem-mgmt code rrt fmt member parser comparer printer */
1552 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1553 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1554 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1555 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1556 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1557 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1558 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1559 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1560 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1561 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, in6addr, in6addr,in6addr ),
1562 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1563 .checklabel= ckl_srv, .postsort= postsort_srv),
1565 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1566 .getrrsz= gsz_addr, .query_send= qs_addr),
1567 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1568 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1569 .checklabel= ckl_ptr),
1570 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1571 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1572 .checklabel= ckl_srv, .postsort= postsort_srv),
1574 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1575 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1578 static const typeinfo tinfo_addrsub =
1579 FLAT_TYPE(none, "<addr>","sub",addr, addr, 0, addr,
1580 .getrrsz= gsz_addr);
1582 static const typeinfo typeinfo_unknown=
1583 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1585 const typeinfo *adns__findtype(adns_rrtype type) {
1586 const typeinfo *begin, *end, *mid;
1588 if (type & adns_r_unknown) return &typeinfo_unknown;
1589 type &= adns_rrt_reprmask;
1591 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1593 while (begin < end) {
1594 mid= begin + ((end-begin)>>1);
1595 if (mid->typekey == type) return mid;
1596 if (type > mid->typekey) begin= mid+1;