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)
50 * _inaddr (pa,cs,di, +search_sortlist, dip_genaddr)
52 * _addr (pa,di,csp,cs, +search_sortlist_sa, dip_sockaddr)
55 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs)
58 * _inthostaddr (mf,cs)
63 * _mailbox (pap +pap_mailbox822)
66 * _srv* (qdpl,(pap),pa,mf,di,(csp),cs,postsort)
71 * within each section:
88 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
89 int *len_r, char **str_r) {
90 /* Neither len_r nor str_r may be null.
91 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
93 const byte *dgram= pai->dgram;
99 if (cbyte >= max) return adns_s_invaliddata;
101 if (cbyte+l > max) return adns_s_invaliddata;
103 str= adns__alloc_interim(pai->qu, l+1);
107 memcpy(str,dgram+cbyte,l);
116 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
122 for (cn=0; cn<len; cn++) {
126 } else if (ch == '"') {
128 } else if (ch >= 32 && ch <= 126) {
129 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
131 sprintf(buf,"\\x%02x",ch);
144 static void mf_str(adns_query qu, void *datap) {
147 adns__makefinal_str(qu,rrp);
154 static void mf_intstr(adns_query qu, void *datap) {
155 adns_rr_intstr *rrp= datap;
157 adns__makefinal_str(qu,&rrp->str);
164 static void mf_manyistr(adns_query qu, void *datap) {
165 adns_rr_intstr **rrp= datap;
166 adns_rr_intstr *te, *table;
170 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
172 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
174 for (te= *rrp; te->i >= 0; te++)
175 adns__makefinal_str(qu,&te->str);
182 static adns_status pa_txt(const parseinfo *pai, int cbyte,
183 int max, void *datap) {
184 adns_rr_intstr **rrp= datap, *table, *te;
185 const byte *dgram= pai->dgram;
186 int ti, tc, l, startbyte;
190 if (cbyte >= max) return adns_s_invaliddata;
192 while (cbyte < max) {
197 if (cbyte != max || !tc) return adns_s_invaliddata;
199 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
202 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
203 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
206 assert(cbyte == max);
215 static adns_status cs_txt(vbuf *vb, const void *datap) {
216 const adns_rr_intstr *const *rrp= datap;
217 const adns_rr_intstr *current;
221 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
222 if (spc) CSP_ADDSTR(" ");
223 st= csp_qstring(vb,current->str,current->i); if (st) return st;
232 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
233 const adns_rr_intstrpair *rrp= datap;
236 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
238 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
243 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr)
246 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
247 int max, void *datap) {
248 struct in_addr *storeto= datap;
250 if (max-cbyte != 4) return adns_s_invaliddata;
251 memcpy(storeto, pai->dgram + cbyte, 4);
255 static int search_sortlist(adns_state ads, int af, const void *ad) {
256 const struct sortlist *slp;
259 for (i=0, slp=ads->sortlist;
260 i<ads->nsortlist && (af != slp->ai->af ||
261 !slp->ai->matchp(ad, &slp->base, &slp->mask));
266 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
269 if (!ads->nsortlist) return 0;
271 ai= search_sortlist(ads,af,a);
272 bi= search_sortlist(ads,af,b);
276 static int di_inaddr(adns_state ads,
277 const void *datap_a, const void *datap_b) {
278 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
281 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
282 const struct in_addr *rrp= datap, rr= *rrp;
285 ia= inet_ntoa(rr); assert(ia);
291 * _in6addr (pa,di,cs)
294 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
295 int max, void *datap) {
296 struct in6_addr *storeto= datap;
298 if (max-cbyte != 16) return adns_s_invaliddata;
299 memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
303 static int di_in6addr(adns_state ads,
304 const void *datap_a, const void *datap_b) {
305 return dip_genaddr(ads,AF_INET6,datap_a,AF_INET6,datap_b);
308 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
309 char buf[INET6_ADDRSTRLEN];
312 ia= inet_ntop(AF_INET6, datap, buf, sizeof(buf)); assert(ia);
318 * _addr (pa,di,csp,cs, +search_sortlist_sa, dip_sockaddr)
321 static adns_status pa_addr(const parseinfo *pai, int cbyte,
322 int max, void *datap) {
323 adns_rr_addr *storeto= datap;
324 const byte *dgram= pai->dgram;
326 if (max-cbyte != 4) return adns_s_invaliddata;
327 storeto->len= sizeof(storeto->addr.inet);
328 memset(&storeto->addr,0,sizeof(storeto->addr.inet));
329 storeto->addr.inet.sin_family= AF_INET;
330 memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
334 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa)
336 const struct afinfo *ai = 0;
338 switch (sa->sa_family) {
339 case AF_INET: ai = &adns__inet_afinfo; break;
340 case AF_INET6: ai = &adns__inet6_afinfo; break;
344 return search_sortlist(ads, sa->sa_family, ai->sockaddr_to_inaddr(sa));
347 static int dip_sockaddr(adns_state ads,
348 const struct sockaddr *sa,
349 const struct sockaddr *sb)
351 if (!ads->sortlist) return 0;
352 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
355 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
356 const adns_rr_addr *ap= datap_a, *bp= datap_b;
358 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
361 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
362 const adns_state ads= context;
364 return di_addr(ads, datap_a, datap_b);
367 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
371 switch (rrp->addr.inet.sin_family) {
374 ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
378 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
385 static adns_status cs_addr(vbuf *vb, const void *datap) {
386 const adns_rr_addr *rrp= datap;
388 return csp_addr(vb,rrp);
392 * _domain (pap,csp,cs)
396 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
397 char **domain_r, parsedomain_flags flags) {
401 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
402 pai->dgram,pai->dglen, cbyte_io, max);
404 if (!pai->qu->vb.used) return adns_s_invaliddata;
406 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
409 dm[pai->qu->vb.used]= 0;
410 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
416 static adns_status csp_domain(vbuf *vb, const char *domain) {
418 if (!*domain) CSP_ADDSTR(".");
422 static adns_status cs_domain(vbuf *vb, const void *datap) {
423 const char *const *domainp= datap;
424 return csp_domain(vb,*domainp);
427 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
428 int max, void *datap) {
432 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
435 if (cbyte != max) return adns_s_invaliddata;
443 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
444 int max, void *datap) {
448 st= pap_domain(pai, &cbyte, max, rrp,
449 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
452 if (cbyte != max) return adns_s_invaliddata;
457 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs)
460 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
461 int *cbyte_io, int count, int dmstart) {
463 int type, class, rdlen, rdstart, ownermatched;
467 for (rri=0, naddrs=-1; rri<count; rri++) {
468 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
469 pai->dglen, cbyte_io,
470 &type, &class, &ttl, &rdlen, &rdstart,
471 pai->dgram, pai->dglen, dmstart, &ownermatched);
473 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
474 if (naddrs>0) break; else continue;
479 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*sizeof(adns_rr_addr)))
481 adns__update_expires(pai->qu,ttl,pai->now);
482 st= pa_addr(pai, rdstart,rdstart+rdlen,
483 pai->qu->vb.buf + naddrs*sizeof(adns_rr_addr));
488 ha->addrs= adns__alloc_interim(pai->qu, naddrs*sizeof(adns_rr_addr));
489 if (!ha->addrs) R_NOMEM;
490 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*sizeof(adns_rr_addr));
492 ha->astatus= adns_s_ok;
494 adns__isort(ha->addrs, naddrs, sizeof(adns_rr_addr), pai->qu->vb.buf,
500 static void icb_hostaddr(adns_query parent, adns_query child) {
501 adns_answer *cans= child->answer;
502 adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
503 adns_state ads= parent->ads;
508 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
509 rrp->addrs= cans->rrs.addr;
510 adns__transfer_interim(child, parent, rrp->addrs,
511 rrp->naddrs*sizeof(adns_rr_addr));
513 if (parent->children.head) {
514 LIST_LINK_TAIL(ads->childw,parent);
516 adns__query_done(parent);
520 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
521 int max, adns_rr_hostaddr *rrp) {
527 adns_queryflags nflags;
529 dmstart= cbyte= *cbyte_io;
530 st= pap_domain(pai, &cbyte, max, &rrp->host,
531 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
535 rrp->astatus= adns_s_ok;
541 st= pap_findaddrs(pai, rrp, &cbyte, pai->nscount, dmstart);
543 if (rrp->naddrs != -1) return adns_s_ok;
545 st= pap_findaddrs(pai, rrp, &cbyte, pai->arcount, dmstart);
547 if (rrp->naddrs != -1) return adns_s_ok;
549 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
550 pai->dgram, pai->dglen, dmstart,
551 adns_r_addr, adns_qf_quoteok_query);
555 ctx.callback= icb_hostaddr;
556 ctx.info.hostaddr= rrp;
558 nflags= adns_qf_quoteok_query;
559 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
561 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
562 &pai->qu->vb, id, nflags, pai->now, &ctx);
565 nqu->parent= pai->qu;
566 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
571 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
572 int max, void *datap) {
573 adns_rr_hostaddr *rrp= datap;
576 st= pap_hostaddr(pai, &cbyte, max, rrp);
578 if (cbyte != max) return adns_s_invaliddata;
583 static int dip_hostaddr(adns_state ads,
584 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
585 if (ap->astatus != bp->astatus) return ap->astatus;
586 if (ap->astatus) return 0;
588 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
591 static int di_hostaddr(adns_state ads,
592 const void *datap_a, const void *datap_b) {
593 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
595 return dip_hostaddr(ads, ap,bp);
598 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
601 adns__makefinal_str(qu,&rrp->host);
603 adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs));
607 static void mf_hostaddr(adns_query qu, void *datap) {
608 adns_rr_hostaddr *rrp= datap;
610 mfp_hostaddr(qu,rrp);
613 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
619 st= csp_domain(vb,rrp->host); if (st) return st;
622 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
624 sprintf(buf," %d ",rrp->astatus);
627 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
630 errstr= adns_strerror(rrp->astatus);
631 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
633 if (rrp->naddrs >= 0) {
635 for (i=0; i<rrp->naddrs; i++) {
637 st= csp_addr(vb,&rrp->addrs[i]);
646 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
647 const adns_rr_hostaddr *rrp= datap;
649 return csp_hostaddr(vb,rrp);
656 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
657 int max, void *datap) {
658 const byte *dgram= pai->dgram;
659 adns_rr_intstr *rrp= datap;
663 if (cbyte+2 > max) return adns_s_invaliddata;
666 st= pap_domain(pai, &cbyte, max, &rrp->str,
667 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
670 if (cbyte != max) return adns_s_invaliddata;
674 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
675 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
677 if (ap->i < bp->i) return 0;
678 if (ap->i > bp->i) return 1;
686 static adns_status pa_mx(const parseinfo *pai, int cbyte,
687 int max, void *datap) {
688 const byte *dgram= pai->dgram;
689 adns_rr_inthostaddr *rrp= datap;
693 if (cbyte+2 > max) return adns_s_invaliddata;
696 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
699 if (cbyte != max) return adns_s_invaliddata;
703 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
704 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
706 if (ap->i < bp->i) return 0;
707 if (ap->i > bp->i) return 1;
708 return dip_hostaddr(ads, &ap->ha, &bp->ha);
712 * _inthostaddr (mf,cs)
715 static void mf_inthostaddr(adns_query qu, void *datap) {
716 adns_rr_inthostaddr *rrp= datap;
718 mfp_hostaddr(qu,&rrp->ha);
721 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
722 const adns_rr_inthostaddr *rrp= datap;
725 sprintf(buf,"%u ",rrp->i);
728 return csp_hostaddr(vb,&rrp->ha);
735 static adns_status cs_inthost(vbuf *vb, const void *datap) {
736 const adns_rr_intstr *rrp= datap;
739 sprintf(buf,"%u ",rrp->i);
741 return csp_domain(vb,rrp->str);
745 * _ptr (pa, +icb_ptr)
748 static void icb_ptr(adns_query parent, adns_query child) {
749 adns_answer *cans= child->answer;
750 const adns_rr_addr *queried, *found;
751 adns_state ads= parent->ads;
754 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
755 adns__query_fail(parent,adns_s_inconsistent);
757 } else if (cans->status) {
758 adns__query_fail(parent,cans->status);
762 queried= &parent->ctx.info.ptr_parent_addr;
763 for (i=0, found=cans->rrs.addr; i<cans->nrrs; i++, found++) {
764 if (queried->len == found->len &&
765 !memcmp(&queried->addr,&found->addr,queried->len)) {
766 if (!parent->children.head) {
767 adns__query_done(parent);
770 LIST_LINK_TAIL(ads->childw,parent);
776 adns__query_fail(parent,adns_s_inconsistent);
779 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
780 int max, void *datap) {
781 static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
790 int cbyte, i, lablen, labstart, l, id;
795 st= pap_domain(pai, &cbyte, max, rrp,
796 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
798 if (cbyte != max) return adns_s_invaliddata;
800 ap= &pai->qu->ctx.info.ptr_parent_addr;
802 adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
803 pai->qu->query_dgram, pai->qu->query_dglen,
804 pai->qu->query_dglen, DNS_HDRSIZE, 0);
805 for (i=0; i<4; i++) {
806 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
807 if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
808 memcpy(labbuf, pai->qu->query_dgram + labstart, lablen);
810 ipv[3-i]= strtoul(labbuf,&ep,10);
811 if (*ep) return adns_s_querydomainwrong;
812 if (lablen>1 && pai->qu->query_dgram[labstart]=='0')
813 return adns_s_querydomainwrong;
815 for (i=0; i<sizeof(expectdomain)/sizeof(*expectdomain); i++) {
816 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
817 l= strlen(expectdomain[i]);
819 memcmp(pai->qu->query_dgram + labstart, expectdomain[i], l))
820 return adns_s_querydomainwrong;
822 st= adns__findlabel_next(&fls,&lablen,0); assert(!st);
823 if (lablen) return adns_s_querydomainwrong;
825 ap->len= sizeof(struct sockaddr_in);
826 memset(&ap->addr,0,sizeof(ap->addr.inet));
827 ap->addr.inet.sin_family= AF_INET;
828 ap->addr.inet.sin_addr.s_addr=
829 htonl((ipv[0]<<24) | (ipv[1]<<16) | (ipv[2]<<8) | (ipv[3]));
832 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
833 pai->dgram, pai->dglen, dmstart,
834 adns_r_addr, adns_qf_quoteok_query);
838 ctx.callback= icb_ptr;
839 memset(&ctx.info,0,sizeof(ctx.info));
840 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
842 adns_qf_quoteok_query, pai->now, &ctx);
845 nqu->parent= pai->qu;
846 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
854 static void mf_strpair(adns_query qu, void *datap) {
855 adns_rr_strpair *rrp= datap;
857 adns__makefinal_str(qu,&rrp->array[0]);
858 adns__makefinal_str(qu,&rrp->array[1]);
865 static void mf_intstrpair(adns_query qu, void *datap) {
866 adns_rr_intstrpair *rrp= datap;
868 adns__makefinal_str(qu,&rrp->array[0].str);
869 adns__makefinal_str(qu,&rrp->array[1].str);
876 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
877 int max, void *datap) {
878 adns_rr_intstrpair *rrp= datap;
882 for (i=0; i<2; i++) {
883 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
887 if (cbyte != max) return adns_s_invaliddata;
896 static adns_status pap_mailbox822(const parseinfo *pai,
897 int *cbyte_io, int max, char **mb_r) {
898 int lablen, labstart, i, needquote, c, r, neednorm;
899 const unsigned char *p;
907 adns__findlabel_start(&fls, pai->ads,
909 pai->dgram, pai->dglen, max,
910 *cbyte_io, cbyte_io);
911 st= adns__findlabel_next(&fls,&lablen,&labstart);
913 adns__vbuf_appendstr(vb,".");
918 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
920 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
921 if (c == '.' && !neednorm) neednorm= 1;
922 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
926 if (needquote || neednorm) {
927 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
928 adns__vbuf_appendq(vb,"\"",1);
929 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
931 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
932 adns__vbuf_appendq(vb,p,1);
934 adns__vbuf_appendq(vb,"\"",1);
936 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
939 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
941 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
945 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
946 memcpy(str,vb->buf,vb->used);
952 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
954 if (pai->qu->typei->typekey & adns__qtf_mail822) {
955 return pap_mailbox822(pai, cbyte_io, max, mb_r);
957 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
961 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
962 return csp_domain(vb,mailbox);
969 static adns_status pa_rp(const parseinfo *pai, int cbyte,
970 int max, void *datap) {
971 adns_rr_strpair *rrp= datap;
974 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
977 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
980 if (cbyte != max) return adns_s_invaliddata;
984 static adns_status cs_rp(vbuf *vb, const void *datap) {
985 const adns_rr_strpair *rrp= datap;
988 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
990 st= csp_domain(vb,rrp->array[1]); if (st) return st;
999 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1000 int max, void *datap) {
1001 adns_rr_soa *rrp= datap;
1002 const byte *dgram= pai->dgram;
1006 st= pap_domain(pai, &cbyte, max, &rrp->mname,
1007 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1010 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1013 if (cbyte+20 != max) return adns_s_invaliddata;
1015 for (i=0; i<5; i++) {
1018 (&rrp->serial)[i]= (msw<<16) | lsw;
1024 static void mf_soa(adns_query qu, void *datap) {
1025 adns_rr_soa *rrp= datap;
1027 adns__makefinal_str(qu,&rrp->mname);
1028 adns__makefinal_str(qu,&rrp->rname);
1031 static adns_status cs_soa(vbuf *vb, const void *datap) {
1032 const adns_rr_soa *rrp= datap;
1037 st= csp_domain(vb,rrp->mname); if (st) return st;
1039 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1041 for (i=0; i<5; i++) {
1042 sprintf(buf," %lu",(&rrp->serial)[i]);
1050 * _srv* (pa*2,di,cs*2,qdpl,postsort)
1053 static adns_status qdpl_srv(adns_state ads,
1054 const char **p_io, const char *pe, int labelnum,
1055 char label_r[DNS_MAXDOMAIN], int *ll_io,
1056 adns_queryflags flags,
1057 const typeinfo *typei) {
1062 if (labelnum < 2 && !(flags & adns_qf_quoteok_query)) {
1063 useflags= adns_qf_quoteok_query;
1069 st= adns__qdpl_normal(ads, p_io,pe, labelnum,label_r, ll_io, useflags,typei);
1074 if (!ll || label_r[0]!='_')
1075 return adns_s_querydomaininvalid;
1076 if (memchr(p_orig+1, '\\', pe - (p_orig+1)))
1077 return adns_s_querydomaininvalid;
1082 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1084 /* might be adns_rr_srvraw* */) {
1085 const byte *dgram= pai->dgram;
1089 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1091 rrp->priority= GET_W(cbyte, ti);
1092 rrp->weight= GET_W(cbyte, ti);
1093 rrp->port= GET_W(cbyte, ti);
1097 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1098 int max, void *datap) {
1099 adns_rr_srvraw *rrp= datap;
1102 st= pap_srv_begin(pai,&cbyte,max,datap);
1105 st= pap_domain(pai, &cbyte, max, &rrp->host,
1106 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1109 if (cbyte != max) return adns_s_invaliddata;
1113 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1114 int max, void *datap) {
1115 adns_rr_srvha *rrp= datap;
1118 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1119 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1120 if (cbyte != max) return adns_s_invaliddata;
1124 static void mf_srvraw(adns_query qu, void *datap) {
1125 adns_rr_srvraw *rrp= datap;
1126 adns__makefinal_str(qu, &rrp->host);
1129 static void mf_srvha(adns_query qu, void *datap) {
1130 adns_rr_srvha *rrp= datap;
1131 mfp_hostaddr(qu,&rrp->ha);
1134 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1135 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1136 /* might be const adns_rr_svhostaddr* */
1138 if (ap->priority < bp->priority) return 0;
1139 if (ap->priority > bp->priority) return 1;
1143 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1144 /* might be adns_rr_srvraw* */) {
1146 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1151 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1152 const adns_rr_srvraw *rrp= datap;
1155 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1156 return csp_domain(vb,rrp->host);
1159 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1160 const adns_rr_srvha *rrp= datap;
1163 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1164 return csp_hostaddr(vb,&rrp->ha);
1167 static void postsort_srv(adns_state ads, void *array, int nrrs,
1168 const struct typeinfo *typei) {
1169 /* we treat everything in the array as if it were an adns_rr_srvha
1170 * even though the array might be of adns_rr_srvraw. That's OK
1171 * because they have the same prefix, which is all we access.
1172 * We use typei->rrsz, too, rather than naive array indexing, of course.
1174 char *workbegin, *workend, *search, *arrayend;
1175 const adns_rr_srvha *rr;
1176 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1177 int cpriority, totalweight, runtotal;
1180 for (workbegin= array, arrayend= workbegin + typei->rrsz * nrrs;
1181 workbegin < arrayend;
1182 workbegin= workend) {
1183 cpriority= (rr=(void*)workbegin)->priority;
1185 for (workend= workbegin, totalweight= 0;
1186 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1187 workend += typei->rrsz) {
1188 totalweight += rr->weight;
1191 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1192 * cpriority. From now on, workbegin points to the `remaining'
1193 * records: we select one record at a time (RFC2782 `Usage rules'
1194 * and `Format of the SRV RR' subsection `Weight') to place at
1195 * workbegin (swapping with the one that was there, and then
1196 * advance workbegin. */
1198 workbegin + typei->rrsz < workend; /* don't bother if just one */
1199 workbegin += typei->rrsz) {
1201 randval= nrand48(ads->rand48xsubi);
1202 randval %= (totalweight + 1);
1203 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1204 * totalweight must be <= 2^26 so probability nonuniformity is
1205 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1206 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1209 for (search=workbegin, runtotal=0;
1210 (runtotal += (rr=(void*)search)->weight) < randval;
1211 search += typei->rrsz);
1212 assert(search < arrayend);
1213 totalweight -= rr->weight;
1214 if (search != workbegin) {
1215 memcpy(&rrtmp, workbegin, typei->rrsz);
1216 memcpy(workbegin, search, typei->rrsz);
1217 memcpy(search, &rrtmp, typei->rrsz);
1222 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1223 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1224 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1232 static void mf_byteblock(adns_query qu, void *datap) {
1233 adns_rr_byteblock *rrp= datap;
1234 void *bytes= rrp->data;
1235 adns__makefinal_block(qu,&bytes,rrp->len);
1243 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1244 int max, void *datap) {
1245 adns_rr_byteblock *rrp= datap;
1247 rrp->len= max - cbyte;
1248 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1249 if (!rrp->data) R_NOMEM;
1250 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1254 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1255 const adns_rr_byteblock *rrp= datap;
1260 sprintf(buf,"\\# %d",rrp->len);
1263 for (l= rrp->len, p= rrp->data;
1266 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1272 sprintf(buf," %02x",*p);
1282 static void mf_flat(adns_query qu, void *data) { }
1288 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1290 #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb
1291 #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb
1293 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1294 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1295 printer,parser,comparer, adns__qdpl_normal,0 }
1296 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1297 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1298 printer,parser,comparer, adns__qdpl_normal,0 }
1299 #define XTRA_TYPE(code,rrt,fmt,memb,parser,comparer,printer,qdpl,postsort) \
1300 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1301 printer,parser,comparer,qdpl,postsort }
1303 static const typeinfo typeinfos[] = {
1304 /* Must be in ascending order of rrtype ! */
1305 /* mem-mgmt code rrt fmt member parser comparer printer */
1307 FLAT_TYPE(a, "A", 0, inaddr, pa_inaddr, di_inaddr,cs_inaddr ),
1308 DEEP_TYPE(ns_raw, "NS", "raw",str, pa_host_raw,0, cs_domain ),
1309 DEEP_TYPE(cname, "CNAME", 0, str, pa_dom_raw, 0, cs_domain ),
1310 DEEP_TYPE(soa_raw,"SOA", "raw",soa, pa_soa, 0, cs_soa ),
1311 DEEP_TYPE(ptr_raw,"PTR", "raw",str, pa_host_raw,0, cs_domain ),
1312 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,pa_hinfo, 0, cs_hinfo ),
1313 DEEP_TYPE(mx_raw, "MX", "raw",intstr, pa_mx_raw, di_mx_raw,cs_inthost ),
1314 DEEP_TYPE(txt, "TXT", 0, manyistr,pa_txt, 0, cs_txt ),
1315 DEEP_TYPE(rp_raw, "RP", "raw",strpair, pa_rp, 0, cs_rp ),
1316 FLAT_TYPE(aaaa, "AAAA", 0, in6addr, pa_in6addr, di_in6addr,cs_in6addr ),
1317 XTRA_TYPE(srv_raw,"SRV", "raw",srvraw , pa_srvraw, di_srv, cs_srvraw,
1318 qdpl_srv, postsort_srv),
1320 FLAT_TYPE(addr, "A", "addr", addr, pa_addr, di_addr, cs_addr ),
1321 DEEP_TYPE(ns, "NS", "+addr",hostaddr,pa_hostaddr,di_hostaddr,cs_hostaddr ),
1322 DEEP_TYPE(ptr, "PTR","checked",str, pa_ptr, 0, cs_domain ),
1323 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,pa_mx, di_mx, cs_inthostaddr),
1324 XTRA_TYPE(srv, "SRV","+addr",srvha, pa_srvha, di_srv, cs_srvha,
1325 qdpl_srv, postsort_srv),
1327 DEEP_TYPE(soa, "SOA","822", soa, pa_soa, 0, cs_soa ),
1328 DEEP_TYPE(rp, "RP", "822", strpair, pa_rp, 0, cs_rp ),
1331 static const typeinfo typeinfo_unknown=
1332 DEEP_TYPE(unknown,0, "unknown",byteblock,pa_opaque, 0, cs_opaque );
1334 const typeinfo *adns__findtype(adns_rrtype type) {
1335 const typeinfo *begin, *end, *mid;
1337 if (type & adns_r_unknown) return &typeinfo_unknown;
1339 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1341 while (begin < end) {
1342 mid= begin + ((end-begin)>>1);
1343 if (mid->typekey == type) return mid;
1344 if (type > mid->typekey) begin= mid+1;