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,dip,di,cs +search_sortlist)
51 * _addr (pa,di,div,csp,cs)
52 * _domain (pap,csp,cs)
55 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs
56 * +pap_findaddrs, icb_hostaddr)
59 * _inthostaddr (mf,cs)
65 * _mailbox (pap,csp +pap_mailbox822)
68 * _srv* (qdpl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
73 * within each section:
90 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
91 int *len_r, char **str_r) {
92 /* Neither len_r nor str_r may be null.
93 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
95 const byte *dgram= pai->dgram;
101 if (cbyte >= max) return adns_s_invaliddata;
103 if (cbyte+l > max) return adns_s_invaliddata;
105 str= adns__alloc_interim(pai->qu, l+1);
109 memcpy(str,dgram+cbyte,l);
118 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
124 for (cn=0; cn<len; cn++) {
128 } else if (ch == '"') {
130 } else if (ch >= 32 && ch <= 126) {
131 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
133 sprintf(buf,"\\x%02x",ch);
146 static void mf_str(adns_query qu, void *datap) {
149 adns__makefinal_str(qu,rrp);
156 static void mf_intstr(adns_query qu, void *datap) {
157 adns_rr_intstr *rrp= datap;
159 adns__makefinal_str(qu,&rrp->str);
166 static void mf_manyistr(adns_query qu, void *datap) {
167 adns_rr_intstr **rrp= datap;
168 adns_rr_intstr *te, *table;
172 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
174 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
176 for (te= *rrp; te->i >= 0; te++)
177 adns__makefinal_str(qu,&te->str);
184 static adns_status pa_txt(const parseinfo *pai, int cbyte,
185 int max, void *datap) {
186 adns_rr_intstr **rrp= datap, *table, *te;
187 const byte *dgram= pai->dgram;
188 int ti, tc, l, startbyte;
192 if (cbyte >= max) return adns_s_invaliddata;
194 while (cbyte < max) {
199 if (cbyte != max || !tc) return adns_s_invaliddata;
201 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
204 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
205 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
208 assert(cbyte == max);
217 static adns_status cs_txt(vbuf *vb, const void *datap) {
218 const adns_rr_intstr *const *rrp= datap;
219 const adns_rr_intstr *current;
223 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
224 if (spc) CSP_ADDSTR(" ");
225 st= csp_qstring(vb,current->str,current->i); if (st) return st;
234 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
235 const adns_rr_intstrpair *rrp= datap;
238 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
240 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
245 * _inaddr (pa,dip,di,cs +search_sortlist)
248 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
249 int max, void *datap) {
250 struct in_addr *storeto= datap;
252 if (max-cbyte != 4) return adns_s_invaliddata;
253 memcpy(storeto, pai->dgram + cbyte, 4);
257 static int search_sortlist(adns_state ads, struct in_addr ad) {
258 const struct sortlist *slp;
261 for (i=0, slp=ads->sortlist;
263 !((ad.s_addr & slp->mask.s_addr) == slp->base.s_addr);
268 static int dip_inaddr(adns_state ads, struct in_addr a, struct in_addr b) {
271 if (!ads->nsortlist) return 0;
273 ai= search_sortlist(ads,a);
274 bi= search_sortlist(ads,b);
278 static int di_inaddr(adns_state ads,
279 const void *datap_a, const void *datap_b) {
280 const struct in_addr *ap= datap_a, *bp= datap_b;
282 return dip_inaddr(ads,*ap,*bp);
285 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
286 const struct in_addr *rrp= datap, rr= *rrp;
289 ia= inet_ntoa(rr); assert(ia);
295 * _addr (pa,di,div,csp,cs)
298 static adns_status pa_addr(const parseinfo *pai, int cbyte,
299 int max, void *datap) {
300 adns_rr_addr *storeto= datap;
301 const byte *dgram= pai->dgram;
303 if (max-cbyte != 4) return adns_s_invaliddata;
304 storeto->len= sizeof(storeto->addr.inet);
305 memset(&storeto->addr,0,sizeof(storeto->addr.inet));
306 storeto->addr.inet.sin_family= AF_INET;
307 memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
311 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
312 const adns_rr_addr *ap= datap_a, *bp= datap_b;
314 assert(ap->addr.sa.sa_family == AF_INET);
315 return dip_inaddr(ads, ap->addr.inet.sin_addr, bp->addr.inet.sin_addr);
318 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
319 const adns_state ads= context;
321 return di_addr(ads, datap_a, datap_b);
324 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
328 switch (rrp->addr.inet.sin_family) {
331 ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
335 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
342 static adns_status cs_addr(vbuf *vb, const void *datap) {
343 const adns_rr_addr *rrp= datap;
345 return csp_addr(vb,rrp);
349 * _domain (pap,csp,cs)
353 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
354 char **domain_r, parsedomain_flags flags) {
358 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
359 pai->dgram,pai->dglen, cbyte_io, max);
361 if (!pai->qu->vb.used) return adns_s_invaliddata;
363 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
366 dm[pai->qu->vb.used]= 0;
367 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
373 static adns_status csp_domain(vbuf *vb, const char *domain) {
375 if (!*domain) CSP_ADDSTR(".");
379 static adns_status cs_domain(vbuf *vb, const void *datap) {
380 const char *const *domainp= datap;
381 return csp_domain(vb,*domainp);
384 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
385 int max, void *datap) {
389 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
392 if (cbyte != max) return adns_s_invaliddata;
400 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
401 int max, void *datap) {
405 st= pap_domain(pai, &cbyte, max, rrp,
406 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
409 if (cbyte != max) return adns_s_invaliddata;
414 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
417 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
418 int *cbyte_io, int count, int dmstart) {
420 int type, class, rdlen, rdstart, ownermatched;
424 for (rri=0, naddrs=-1; rri<count; rri++) {
425 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
426 pai->dglen, cbyte_io,
427 &type, &class, &ttl, &rdlen, &rdstart,
428 pai->dgram, pai->dglen, dmstart, &ownermatched);
430 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
431 if (naddrs>0) break; else continue;
436 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*sizeof(adns_rr_addr)))
438 adns__update_expires(pai->qu,ttl,pai->now);
439 st= pa_addr(pai, rdstart,rdstart+rdlen,
440 pai->qu->vb.buf + naddrs*sizeof(adns_rr_addr));
445 ha->addrs= adns__alloc_interim(pai->qu, naddrs*sizeof(adns_rr_addr));
446 if (!ha->addrs) R_NOMEM;
447 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*sizeof(adns_rr_addr));
449 ha->astatus= adns_s_ok;
451 adns__isort(ha->addrs, naddrs, sizeof(adns_rr_addr), pai->qu->vb.buf,
457 static void icb_hostaddr(adns_query parent, adns_query child) {
458 adns_answer *cans= child->answer;
459 adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
460 adns_state ads= parent->ads;
465 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
466 rrp->addrs= cans->rrs.addr;
467 adns__transfer_interim(child, parent, rrp->addrs,
468 rrp->naddrs*sizeof(adns_rr_addr));
470 if (parent->children.head) {
471 LIST_LINK_TAIL(ads->childw,parent);
473 adns__query_done(parent);
477 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
478 int max, adns_rr_hostaddr *rrp) {
484 adns_queryflags nflags;
486 dmstart= cbyte= *cbyte_io;
487 st= pap_domain(pai, &cbyte, max, &rrp->host,
488 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
492 rrp->astatus= adns_s_ok;
498 st= pap_findaddrs(pai, rrp, &cbyte, pai->nscount, dmstart);
500 if (rrp->naddrs != -1) return adns_s_ok;
502 st= pap_findaddrs(pai, rrp, &cbyte, pai->arcount, dmstart);
504 if (rrp->naddrs != -1) return adns_s_ok;
506 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
507 pai->dgram, pai->dglen, dmstart,
508 adns_r_addr, adns_qf_quoteok_query);
512 ctx.callback= icb_hostaddr;
513 ctx.info.hostaddr= rrp;
515 nflags= adns_qf_quoteok_query;
516 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
518 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
519 &pai->qu->vb, id, nflags, pai->now, &ctx);
522 nqu->parent= pai->qu;
523 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
528 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
529 int max, void *datap) {
530 adns_rr_hostaddr *rrp= datap;
533 st= pap_hostaddr(pai, &cbyte, max, rrp);
535 if (cbyte != max) return adns_s_invaliddata;
540 static int dip_hostaddr(adns_state ads,
541 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
542 if (ap->astatus != bp->astatus) return ap->astatus;
543 if (ap->astatus) return 0;
545 assert(ap->addrs[0].addr.sa.sa_family == AF_INET);
546 assert(bp->addrs[0].addr.sa.sa_family == AF_INET);
547 return dip_inaddr(ads,
548 ap->addrs[0].addr.inet.sin_addr,
549 bp->addrs[0].addr.inet.sin_addr);
552 static int di_hostaddr(adns_state ads,
553 const void *datap_a, const void *datap_b) {
554 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
556 return dip_hostaddr(ads, ap,bp);
559 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
562 adns__makefinal_str(qu,&rrp->host);
564 adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs));
568 static void mf_hostaddr(adns_query qu, void *datap) {
569 adns_rr_hostaddr *rrp= datap;
571 mfp_hostaddr(qu,rrp);
574 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
580 st= csp_domain(vb,rrp->host); if (st) return st;
583 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
585 sprintf(buf," %d ",rrp->astatus);
588 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
591 errstr= adns_strerror(rrp->astatus);
592 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
594 if (rrp->naddrs >= 0) {
596 for (i=0; i<rrp->naddrs; i++) {
598 st= csp_addr(vb,&rrp->addrs[i]);
607 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
608 const adns_rr_hostaddr *rrp= datap;
610 return csp_hostaddr(vb,rrp);
617 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
618 int max, void *datap) {
619 const byte *dgram= pai->dgram;
620 adns_rr_intstr *rrp= datap;
624 if (cbyte+2 > max) return adns_s_invaliddata;
627 st= pap_domain(pai, &cbyte, max, &rrp->str,
628 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
631 if (cbyte != max) return adns_s_invaliddata;
635 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
636 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
638 if (ap->i < bp->i) return 0;
639 if (ap->i > bp->i) return 1;
647 static adns_status pa_mx(const parseinfo *pai, int cbyte,
648 int max, void *datap) {
649 const byte *dgram= pai->dgram;
650 adns_rr_inthostaddr *rrp= datap;
654 if (cbyte+2 > max) return adns_s_invaliddata;
657 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
660 if (cbyte != max) return adns_s_invaliddata;
664 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
665 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
667 if (ap->i < bp->i) return 0;
668 if (ap->i > bp->i) return 1;
669 return dip_hostaddr(ads, &ap->ha, &bp->ha);
673 * _inthostaddr (mf,cs)
676 static void mf_inthostaddr(adns_query qu, void *datap) {
677 adns_rr_inthostaddr *rrp= datap;
679 mfp_hostaddr(qu,&rrp->ha);
682 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
683 const adns_rr_inthostaddr *rrp= datap;
686 sprintf(buf,"%u ",rrp->i);
689 return csp_hostaddr(vb,&rrp->ha);
696 static adns_status cs_inthost(vbuf *vb, const void *datap) {
697 const adns_rr_intstr *rrp= datap;
700 sprintf(buf,"%u ",rrp->i);
702 return csp_domain(vb,rrp->str);
706 * _ptr (pa, +icb_ptr)
709 static void icb_ptr(adns_query parent, adns_query child) {
710 adns_answer *cans= child->answer;
711 const adns_rr_addr *queried, *found;
712 adns_state ads= parent->ads;
715 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
716 adns__query_fail(parent,adns_s_inconsistent);
718 } else if (cans->status) {
719 adns__query_fail(parent,cans->status);
723 queried= &parent->ctx.info.ptr_parent_addr;
724 for (i=0, found=cans->rrs.addr; i<cans->nrrs; i++, found++) {
725 if (queried->len == found->len &&
726 !memcmp(&queried->addr,&found->addr,queried->len)) {
727 if (!parent->children.head) {
728 adns__query_done(parent);
731 LIST_LINK_TAIL(ads->childw,parent);
737 adns__query_fail(parent,adns_s_inconsistent);
740 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
741 int max, void *datap) {
742 static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
751 int cbyte, i, lablen, labstart, l, id;
756 st= pap_domain(pai, &cbyte, max, rrp,
757 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
759 if (cbyte != max) return adns_s_invaliddata;
761 ap= &pai->qu->ctx.info.ptr_parent_addr;
763 adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
764 pai->qu->query_dgram, pai->qu->query_dglen,
765 pai->qu->query_dglen, DNS_HDRSIZE, 0);
766 for (i=0; i<4; i++) {
767 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
768 if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
769 memcpy(labbuf, pai->qu->query_dgram + labstart, lablen);
771 ipv[3-i]= strtoul(labbuf,&ep,10);
772 if (*ep) return adns_s_querydomainwrong;
773 if (lablen>1 && pai->qu->query_dgram[labstart]=='0')
774 return adns_s_querydomainwrong;
776 for (i=0; i<sizeof(expectdomain)/sizeof(*expectdomain); i++) {
777 st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
778 l= strlen(expectdomain[i]);
780 memcmp(pai->qu->query_dgram + labstart, expectdomain[i], l))
781 return adns_s_querydomainwrong;
783 st= adns__findlabel_next(&fls,&lablen,0); assert(!st);
784 if (lablen) return adns_s_querydomainwrong;
786 ap->len= sizeof(struct sockaddr_in);
787 memset(&ap->addr,0,sizeof(ap->addr.inet));
788 ap->addr.inet.sin_family= AF_INET;
789 ap->addr.inet.sin_addr.s_addr=
790 htonl((ipv[0]<<24) | (ipv[1]<<16) | (ipv[2]<<8) | (ipv[3]));
793 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
794 pai->dgram, pai->dglen, dmstart,
795 adns_r_addr, adns_qf_quoteok_query);
799 ctx.callback= icb_ptr;
800 memset(&ctx.info,0,sizeof(ctx.info));
801 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
803 adns_qf_quoteok_query, pai->now, &ctx);
806 nqu->parent= pai->qu;
807 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
815 static void mf_strpair(adns_query qu, void *datap) {
816 adns_rr_strpair *rrp= datap;
818 adns__makefinal_str(qu,&rrp->array[0]);
819 adns__makefinal_str(qu,&rrp->array[1]);
826 static void mf_intstrpair(adns_query qu, void *datap) {
827 adns_rr_intstrpair *rrp= datap;
829 adns__makefinal_str(qu,&rrp->array[0].str);
830 adns__makefinal_str(qu,&rrp->array[1].str);
837 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
838 int max, void *datap) {
839 adns_rr_intstrpair *rrp= datap;
843 for (i=0; i<2; i++) {
844 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
848 if (cbyte != max) return adns_s_invaliddata;
854 * _mailbox (pap,cs +pap_mailbox822)
857 static adns_status pap_mailbox822(const parseinfo *pai,
858 int *cbyte_io, int max, char **mb_r) {
859 int lablen, labstart, i, needquote, c, r, neednorm;
860 const unsigned char *p;
868 adns__findlabel_start(&fls, pai->ads,
870 pai->dgram, pai->dglen, max,
871 *cbyte_io, cbyte_io);
872 st= adns__findlabel_next(&fls,&lablen,&labstart);
874 adns__vbuf_appendstr(vb,".");
879 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
881 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
882 if (c == '.' && !neednorm) neednorm= 1;
883 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
887 if (needquote || neednorm) {
888 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
889 adns__vbuf_appendq(vb,"\"",1);
890 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
892 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
893 adns__vbuf_appendq(vb,p,1);
895 adns__vbuf_appendq(vb,"\"",1);
897 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
900 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
902 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
906 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
907 memcpy(str,vb->buf,vb->used);
913 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
915 if (pai->qu->typei->typekey & adns__qtf_mail822) {
916 return pap_mailbox822(pai, cbyte_io, max, mb_r);
918 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
922 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
923 return csp_domain(vb,mailbox);
930 static adns_status pa_rp(const parseinfo *pai, int cbyte,
931 int max, void *datap) {
932 adns_rr_strpair *rrp= datap;
935 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
938 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
941 if (cbyte != max) return adns_s_invaliddata;
945 static adns_status cs_rp(vbuf *vb, const void *datap) {
946 const adns_rr_strpair *rrp= datap;
949 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
951 st= csp_domain(vb,rrp->array[1]); if (st) return st;
960 static adns_status pa_soa(const parseinfo *pai, int cbyte,
961 int max, void *datap) {
962 adns_rr_soa *rrp= datap;
963 const byte *dgram= pai->dgram;
967 st= pap_domain(pai, &cbyte, max, &rrp->mname,
968 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
971 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
974 if (cbyte+20 != max) return adns_s_invaliddata;
976 for (i=0; i<5; i++) {
979 (&rrp->serial)[i]= (msw<<16) | lsw;
985 static void mf_soa(adns_query qu, void *datap) {
986 adns_rr_soa *rrp= datap;
988 adns__makefinal_str(qu,&rrp->mname);
989 adns__makefinal_str(qu,&rrp->rname);
992 static adns_status cs_soa(vbuf *vb, const void *datap) {
993 const adns_rr_soa *rrp= datap;
998 st= csp_domain(vb,rrp->mname); if (st) return st;
1000 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1002 for (i=0; i<5; i++) {
1003 sprintf(buf," %lu",(&rrp->serial)[i]);
1011 * _srv* (qdpl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1014 static adns_status qdpl_srv(adns_state ads,
1015 const char **p_io, const char *pe, int labelnum,
1016 char label_r[DNS_MAXDOMAIN], int *ll_io,
1017 adns_queryflags flags,
1018 const typeinfo *typei) {
1023 if (labelnum < 2 && !(flags & adns_qf_quoteok_query)) {
1024 useflags= adns_qf_quoteok_query;
1030 st= adns__qdpl_normal(ads, p_io,pe, labelnum,label_r, ll_io, useflags,typei);
1035 if (!ll || label_r[0]!='_')
1036 return adns_s_querydomaininvalid;
1037 if (memchr(p_orig+1, '\\', pe - (p_orig+1)))
1038 return adns_s_querydomaininvalid;
1043 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1045 /* might be adns_rr_srvraw* */) {
1046 const byte *dgram= pai->dgram;
1050 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1052 rrp->priority= GET_W(cbyte, ti);
1053 rrp->weight= GET_W(cbyte, ti);
1054 rrp->port= GET_W(cbyte, ti);
1058 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1059 int max, void *datap) {
1060 adns_rr_srvraw *rrp= datap;
1063 st= pap_srv_begin(pai,&cbyte,max,datap);
1066 st= pap_domain(pai, &cbyte, max, &rrp->host,
1067 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1070 if (cbyte != max) return adns_s_invaliddata;
1074 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1075 int max, void *datap) {
1076 adns_rr_srvha *rrp= datap;
1079 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1080 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1081 if (cbyte != max) return adns_s_invaliddata;
1085 static void mf_srvraw(adns_query qu, void *datap) {
1086 adns_rr_srvraw *rrp= datap;
1087 adns__makefinal_str(qu, &rrp->host);
1090 static void mf_srvha(adns_query qu, void *datap) {
1091 adns_rr_srvha *rrp= datap;
1092 mfp_hostaddr(qu,&rrp->ha);
1095 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1096 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1097 /* might be const adns_rr_svhostaddr* */
1099 if (ap->priority < bp->priority) return 0;
1100 if (ap->priority > bp->priority) return 1;
1104 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1105 /* might be adns_rr_srvraw* */) {
1107 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1112 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1113 const adns_rr_srvraw *rrp= datap;
1116 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1117 return csp_domain(vb,rrp->host);
1120 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1121 const adns_rr_srvha *rrp= datap;
1124 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1125 return csp_hostaddr(vb,&rrp->ha);
1128 static void postsort_srv(adns_state ads, void *array, int nrrs,
1129 const struct typeinfo *typei) {
1130 /* we treat everything in the array as if it were an adns_rr_srvha
1131 * even though the array might be of adns_rr_srvraw. That's OK
1132 * because they have the same prefix, which is all we access.
1133 * We use typei->rrsz, too, rather than naive array indexing, of course.
1135 char *workbegin, *workend, *search, *arrayend;
1136 const adns_rr_srvha *rr;
1137 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1138 int cpriority, totalweight, runtotal;
1141 for (workbegin= array, arrayend= workbegin + typei->rrsz * nrrs;
1142 workbegin < arrayend;
1143 workbegin= workend) {
1144 cpriority= (rr=(void*)workbegin)->priority;
1146 for (workend= workbegin, totalweight= 0;
1147 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1148 workend += typei->rrsz) {
1149 totalweight += rr->weight;
1152 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1153 * cpriority. From now on, workbegin points to the `remaining'
1154 * records: we select one record at a time (RFC2782 `Usage rules'
1155 * and `Format of the SRV RR' subsection `Weight') to place at
1156 * workbegin (swapping with the one that was there, and then
1157 * advance workbegin. */
1159 workbegin + typei->rrsz < workend; /* don't bother if just one */
1160 workbegin += typei->rrsz) {
1162 randval= nrand48(ads->rand48xsubi);
1163 randval %= (totalweight + 1);
1164 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1165 * totalweight must be <= 2^26 so probability nonuniformity is
1166 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1167 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1170 for (search=workbegin, runtotal=0;
1171 (runtotal += (rr=(void*)search)->weight) < randval;
1172 search += typei->rrsz);
1173 assert(search < arrayend);
1174 totalweight -= rr->weight;
1175 if (search != workbegin) {
1176 memcpy(&rrtmp, workbegin, typei->rrsz);
1177 memcpy(workbegin, search, typei->rrsz);
1178 memcpy(search, &rrtmp, typei->rrsz);
1183 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1184 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1185 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1193 static void mf_byteblock(adns_query qu, void *datap) {
1194 adns_rr_byteblock *rrp= datap;
1195 void *bytes= rrp->data;
1196 adns__makefinal_block(qu,&bytes,rrp->len);
1204 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1205 int max, void *datap) {
1206 adns_rr_byteblock *rrp= datap;
1208 rrp->len= max - cbyte;
1209 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1210 if (!rrp->data) R_NOMEM;
1211 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1215 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1216 const adns_rr_byteblock *rrp= datap;
1221 sprintf(buf,"\\# %d",rrp->len);
1224 for (l= rrp->len, p= rrp->data;
1227 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1233 sprintf(buf," %02x",*p);
1243 static void mf_flat(adns_query qu, void *data) { }
1249 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1251 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1252 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1253 printer,parser,comparer, adns__qdpl_normal,0 }
1254 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
1255 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1256 printer,parser,comparer, adns__qdpl_normal,0 }
1257 #define XTRA_TYPE(code,rrt,fmt,memb,parser,comparer,printer,qdpl,postsort) \
1258 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1259 printer,parser,comparer,qdpl,postsort }
1261 static const typeinfo typeinfos[] = {
1262 /* Must be in ascending order of rrtype ! */
1263 /* mem-mgmt code rrt fmt member parser comparer printer */
1265 FLAT_TYPE(a, "A", 0, inaddr, pa_inaddr, di_inaddr,cs_inaddr ),
1266 DEEP_TYPE(ns_raw, "NS", "raw",str, pa_host_raw,0, cs_domain ),
1267 DEEP_TYPE(cname, "CNAME", 0, str, pa_dom_raw, 0, cs_domain ),
1268 DEEP_TYPE(soa_raw,"SOA", "raw",soa, pa_soa, 0, cs_soa ),
1269 DEEP_TYPE(ptr_raw,"PTR", "raw",str, pa_host_raw,0, cs_domain ),
1270 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,pa_hinfo, 0, cs_hinfo ),
1271 DEEP_TYPE(mx_raw, "MX", "raw",intstr, pa_mx_raw, di_mx_raw,cs_inthost ),
1272 DEEP_TYPE(txt, "TXT", 0, manyistr,pa_txt, 0, cs_txt ),
1273 DEEP_TYPE(rp_raw, "RP", "raw",strpair, pa_rp, 0, cs_rp ),
1274 XTRA_TYPE(srv_raw,"SRV", "raw",srvraw , pa_srvraw, di_srv, cs_srvraw,
1275 qdpl_srv, postsort_srv),
1277 FLAT_TYPE(addr, "A", "addr", addr, pa_addr, di_addr, cs_addr ),
1278 DEEP_TYPE(ns, "NS", "+addr",hostaddr,pa_hostaddr,di_hostaddr,cs_hostaddr ),
1279 DEEP_TYPE(ptr, "PTR","checked",str, pa_ptr, 0, cs_domain ),
1280 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,pa_mx, di_mx, cs_inthostaddr),
1281 XTRA_TYPE(srv, "SRV","+addr",srvha, pa_srvha, di_srv, cs_srvha,
1282 qdpl_srv, postsort_srv),
1284 DEEP_TYPE(soa, "SOA","822", soa, pa_soa, 0, cs_soa ),
1285 DEEP_TYPE(rp, "RP", "822", strpair, pa_rp, 0, cs_rp ),
1288 static const typeinfo typeinfo_unknown=
1289 DEEP_TYPE(unknown,0, "unknown",byteblock,pa_opaque, 0, cs_opaque );
1291 const typeinfo *adns__findtype(adns_rrtype type) {
1292 const typeinfo *begin, *end, *mid;
1294 if (type & adns_r_unknown) return &typeinfo_unknown;
1296 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1298 while (begin < end) {
1299 mid= begin + ((end-begin)>>1);
1300 if (mid->typekey == type) return mid;
1301 if (type > mid->typekey) begin= mid+1;