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)
61 * _ptr (ckl,pa +icb_ptr)
65 * _mailbox (pap,csp +pap_mailbox822)
68 * _srv* (ckl,(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.pinfo.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.pinfo.hostaddr= rrp;
514 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
516 nflags= adns_qf_quoteok_query;
517 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
519 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
520 &pai->qu->vb, id, nflags, pai->now, &ctx);
523 nqu->parent= pai->qu;
524 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
529 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
530 int max, void *datap) {
531 adns_rr_hostaddr *rrp= datap;
534 st= pap_hostaddr(pai, &cbyte, max, rrp);
536 if (cbyte != max) return adns_s_invaliddata;
541 static int dip_hostaddr(adns_state ads,
542 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
543 if (ap->astatus != bp->astatus) return ap->astatus;
544 if (ap->astatus) return 0;
546 assert(ap->addrs[0].addr.sa.sa_family == AF_INET);
547 assert(bp->addrs[0].addr.sa.sa_family == AF_INET);
548 return dip_inaddr(ads,
549 ap->addrs[0].addr.inet.sin_addr,
550 bp->addrs[0].addr.inet.sin_addr);
553 static int di_hostaddr(adns_state ads,
554 const void *datap_a, const void *datap_b) {
555 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
557 return dip_hostaddr(ads, ap,bp);
560 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
563 adns__makefinal_str(qu,&rrp->host);
565 adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs));
569 static void mf_hostaddr(adns_query qu, void *datap) {
570 adns_rr_hostaddr *rrp= datap;
572 mfp_hostaddr(qu,rrp);
575 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
581 st= csp_domain(vb,rrp->host); if (st) return st;
584 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
586 sprintf(buf," %d ",rrp->astatus);
589 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
592 errstr= adns_strerror(rrp->astatus);
593 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
595 if (rrp->naddrs >= 0) {
597 for (i=0; i<rrp->naddrs; i++) {
599 st= csp_addr(vb,&rrp->addrs[i]);
608 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
609 const adns_rr_hostaddr *rrp= datap;
611 return csp_hostaddr(vb,rrp);
618 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
619 int max, void *datap) {
620 const byte *dgram= pai->dgram;
621 adns_rr_intstr *rrp= datap;
625 if (cbyte+2 > max) return adns_s_invaliddata;
628 st= pap_domain(pai, &cbyte, max, &rrp->str,
629 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
632 if (cbyte != max) return adns_s_invaliddata;
636 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
637 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
639 if (ap->i < bp->i) return 0;
640 if (ap->i > bp->i) return 1;
648 static adns_status pa_mx(const parseinfo *pai, int cbyte,
649 int max, void *datap) {
650 const byte *dgram= pai->dgram;
651 adns_rr_inthostaddr *rrp= datap;
655 if (cbyte+2 > max) return adns_s_invaliddata;
658 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
661 if (cbyte != max) return adns_s_invaliddata;
665 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
666 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
668 if (ap->i < bp->i) return 0;
669 if (ap->i > bp->i) return 1;
670 return dip_hostaddr(ads, &ap->ha, &bp->ha);
674 * _inthostaddr (mf,cs)
677 static void mf_inthostaddr(adns_query qu, void *datap) {
678 adns_rr_inthostaddr *rrp= datap;
680 mfp_hostaddr(qu,&rrp->ha);
683 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
684 const adns_rr_inthostaddr *rrp= datap;
687 sprintf(buf,"%u ",rrp->i);
690 return csp_hostaddr(vb,&rrp->ha);
697 static adns_status cs_inthost(vbuf *vb, const void *datap) {
698 const adns_rr_intstr *rrp= datap;
701 sprintf(buf,"%u ",rrp->i);
703 return csp_domain(vb,rrp->str);
707 * _ptr (ckl,pa +icb_ptr)
710 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
711 union checklabel_state *cls, qcontext *ctx,
712 int labnum, const char *label, int lablen) {
713 static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
720 if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
721 memcpy(labbuf, label, lablen);
723 cls->ptr.ipv[3-labnum]= strtoul(labbuf,&ep,10);
724 if (*ep) return adns_s_querydomainwrong;
725 if (lablen>1 && *label=='0') return adns_s_querydomainwrong;
726 } else if (labnum < 4 + sizeof(expectdomain)/sizeof(*expectdomain)) {
727 ed= expectdomain[labnum-4];
729 if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong;
731 if (lablen) return adns_s_querydomainwrong;
732 ctx->tinfo.ptr.addr.s_addr=
733 htonl((cls->ptr.ipv[0]<<24) | (cls->ptr.ipv[1]<<16) |
734 (cls->ptr.ipv[2]<< 8) | (cls->ptr.ipv[3]));
739 static void icb_ptr(adns_query parent, adns_query child) {
740 adns_answer *cans= child->answer;
741 const struct in_addr *queried;
742 const unsigned char *found;
743 adns_state ads= parent->ads;
746 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
747 adns__query_fail(parent,adns_s_inconsistent);
749 } else if (cans->status) {
750 adns__query_fail(parent,cans->status);
754 queried= &parent->ctx.tinfo.ptr.addr;
755 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
756 if (!memcmp(queried,found,cans->rrsz)) {
757 if (!parent->children.head) {
758 adns__query_done(parent);
761 LIST_LINK_TAIL(ads->childw,parent);
767 adns__query_fail(parent,adns_s_inconsistent);
770 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
771 int max, void *datap) {
779 st= pap_domain(pai, &cbyte, max, rrp,
780 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
782 if (cbyte != max) return adns_s_invaliddata;
784 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
785 pai->dgram, pai->dglen, dmstart,
786 adns_r_a, adns_qf_quoteok_query);
790 ctx.callback= icb_ptr;
791 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
792 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
793 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_a),
795 adns_qf_quoteok_query, pai->now, &ctx);
798 nqu->parent= pai->qu;
799 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
807 static void mf_strpair(adns_query qu, void *datap) {
808 adns_rr_strpair *rrp= datap;
810 adns__makefinal_str(qu,&rrp->array[0]);
811 adns__makefinal_str(qu,&rrp->array[1]);
818 static void mf_intstrpair(adns_query qu, void *datap) {
819 adns_rr_intstrpair *rrp= datap;
821 adns__makefinal_str(qu,&rrp->array[0].str);
822 adns__makefinal_str(qu,&rrp->array[1].str);
829 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
830 int max, void *datap) {
831 adns_rr_intstrpair *rrp= datap;
835 for (i=0; i<2; i++) {
836 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
840 if (cbyte != max) return adns_s_invaliddata;
846 * _mailbox (pap,cs +pap_mailbox822)
849 static adns_status pap_mailbox822(const parseinfo *pai,
850 int *cbyte_io, int max, char **mb_r) {
851 int lablen, labstart, i, needquote, c, r, neednorm;
852 const unsigned char *p;
860 adns__findlabel_start(&fls, pai->ads,
862 pai->dgram, pai->dglen, max,
863 *cbyte_io, cbyte_io);
864 st= adns__findlabel_next(&fls,&lablen,&labstart);
866 adns__vbuf_appendstr(vb,".");
871 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
873 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
874 if (c == '.' && !neednorm) neednorm= 1;
875 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
879 if (needquote || neednorm) {
880 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
881 adns__vbuf_appendq(vb,"\"",1);
882 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
884 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
885 adns__vbuf_appendq(vb,p,1);
887 adns__vbuf_appendq(vb,"\"",1);
889 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
892 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
894 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
898 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
899 memcpy(str,vb->buf,vb->used);
905 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
907 if (pai->qu->typei->typekey & adns__qtf_mail822) {
908 return pap_mailbox822(pai, cbyte_io, max, mb_r);
910 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
914 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
915 return csp_domain(vb,mailbox);
922 static adns_status pa_rp(const parseinfo *pai, int cbyte,
923 int max, void *datap) {
924 adns_rr_strpair *rrp= datap;
927 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
930 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
933 if (cbyte != max) return adns_s_invaliddata;
937 static adns_status cs_rp(vbuf *vb, const void *datap) {
938 const adns_rr_strpair *rrp= datap;
941 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
943 st= csp_domain(vb,rrp->array[1]); if (st) return st;
952 static adns_status pa_soa(const parseinfo *pai, int cbyte,
953 int max, void *datap) {
954 adns_rr_soa *rrp= datap;
955 const byte *dgram= pai->dgram;
959 st= pap_domain(pai, &cbyte, max, &rrp->mname,
960 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
963 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
966 if (cbyte+20 != max) return adns_s_invaliddata;
968 for (i=0; i<5; i++) {
971 (&rrp->serial)[i]= (msw<<16) | lsw;
977 static void mf_soa(adns_query qu, void *datap) {
978 adns_rr_soa *rrp= datap;
980 adns__makefinal_str(qu,&rrp->mname);
981 adns__makefinal_str(qu,&rrp->rname);
984 static adns_status cs_soa(vbuf *vb, const void *datap) {
985 const adns_rr_soa *rrp= datap;
990 st= csp_domain(vb,rrp->mname); if (st) return st;
992 st= csp_mailbox(vb,rrp->rname); if (st) return st;
994 for (i=0; i<5; i++) {
995 sprintf(buf," %lu",(&rrp->serial)[i]);
1003 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1006 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1007 union checklabel_state *cls, qcontext *ctx,
1008 int labnum, const char *label, int lablen) {
1009 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1010 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1013 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1016 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1018 /* might be adns_rr_srvraw* */) {
1019 const byte *dgram= pai->dgram;
1023 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1025 rrp->priority= GET_W(cbyte, ti);
1026 rrp->weight= GET_W(cbyte, ti);
1027 rrp->port= GET_W(cbyte, ti);
1031 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1032 int max, void *datap) {
1033 adns_rr_srvraw *rrp= datap;
1036 st= pap_srv_begin(pai,&cbyte,max,datap);
1039 st= pap_domain(pai, &cbyte, max, &rrp->host,
1040 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1043 if (cbyte != max) return adns_s_invaliddata;
1047 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1048 int max, void *datap) {
1049 adns_rr_srvha *rrp= datap;
1052 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1053 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1054 if (cbyte != max) return adns_s_invaliddata;
1058 static void mf_srvraw(adns_query qu, void *datap) {
1059 adns_rr_srvraw *rrp= datap;
1060 adns__makefinal_str(qu, &rrp->host);
1063 static void mf_srvha(adns_query qu, void *datap) {
1064 adns_rr_srvha *rrp= datap;
1065 mfp_hostaddr(qu,&rrp->ha);
1068 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1069 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1070 /* might be const adns_rr_svhostaddr* */
1072 if (ap->priority < bp->priority) return 0;
1073 if (ap->priority > bp->priority) return 1;
1077 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1078 /* might be adns_rr_srvraw* */) {
1080 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1085 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1086 const adns_rr_srvraw *rrp= datap;
1089 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1090 return csp_domain(vb,rrp->host);
1093 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1094 const adns_rr_srvha *rrp= datap;
1097 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1098 return csp_hostaddr(vb,&rrp->ha);
1101 static void postsort_srv(adns_state ads, void *array, int nrrs,
1102 const struct typeinfo *typei) {
1103 /* we treat everything in the array as if it were an adns_rr_srvha
1104 * even though the array might be of adns_rr_srvraw. That's OK
1105 * because they have the same prefix, which is all we access.
1106 * We use typei->rrsz, too, rather than naive array indexing, of course.
1108 char *workbegin, *workend, *search, *arrayend;
1109 const adns_rr_srvha *rr;
1110 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1111 int cpriority, totalweight, runtotal;
1114 for (workbegin= array, arrayend= workbegin + typei->rrsz * nrrs;
1115 workbegin < arrayend;
1116 workbegin= workend) {
1117 cpriority= (rr=(void*)workbegin)->priority;
1119 for (workend= workbegin, totalweight= 0;
1120 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1121 workend += typei->rrsz) {
1122 totalweight += rr->weight;
1125 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1126 * cpriority. From now on, workbegin points to the `remaining'
1127 * records: we select one record at a time (RFC2782 `Usage rules'
1128 * and `Format of the SRV RR' subsection `Weight') to place at
1129 * workbegin (swapping with the one that was there, and then
1130 * advance workbegin. */
1132 workbegin + typei->rrsz < workend; /* don't bother if just one */
1133 workbegin += typei->rrsz) {
1135 randval= nrand48(ads->rand48xsubi);
1136 randval %= (totalweight + 1);
1137 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1138 * totalweight must be <= 2^26 so probability nonuniformity is
1139 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1140 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1143 for (search=workbegin, runtotal=0;
1144 (runtotal += (rr=(void*)search)->weight) < randval;
1145 search += typei->rrsz);
1146 assert(search < arrayend);
1147 totalweight -= rr->weight;
1148 if (search != workbegin) {
1149 memcpy(&rrtmp, workbegin, typei->rrsz);
1150 memcpy(workbegin, search, typei->rrsz);
1151 memcpy(search, &rrtmp, typei->rrsz);
1156 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1157 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1158 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1166 static void mf_byteblock(adns_query qu, void *datap) {
1167 adns_rr_byteblock *rrp= datap;
1168 void *bytes= rrp->data;
1169 adns__makefinal_block(qu,&bytes,rrp->len);
1177 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1178 int max, void *datap) {
1179 adns_rr_byteblock *rrp= datap;
1181 rrp->len= max - cbyte;
1182 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1183 if (!rrp->data) R_NOMEM;
1184 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1188 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1189 const adns_rr_byteblock *rrp= datap;
1194 sprintf(buf,"\\# %d",rrp->len);
1197 for (l= rrp->len, p= rrp->data;
1200 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1206 sprintf(buf," %02x",*p);
1216 static void mf_flat(adns_query qu, void *data) { }
1222 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1224 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1225 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1226 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1227 adns__ckl_hostname, CDR(__VA_ARGS__) }
1228 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1229 { adns_r_##code, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1230 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1231 adns__ckl_hostname, CDR(__VA_ARGS__) }
1235 static const typeinfo typeinfos[] = {
1236 /* Must be in ascending order of rrtype ! */
1237 /* mem-mgmt code rrt fmt member parser comparer printer */
1239 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1240 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1241 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1242 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1243 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1244 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1245 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1246 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1247 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1248 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1249 .checklabel= ckl_srv, .postsort= postsort_srv),
1251 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr ),
1252 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1253 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1254 .checklabel= ckl_ptr),
1255 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1256 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1257 .checklabel= ckl_srv, .postsort= postsort_srv),
1259 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1260 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1263 static const typeinfo typeinfo_unknown=
1264 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1266 const typeinfo *adns__findtype(adns_rrtype type) {
1267 const typeinfo *begin, *end, *mid;
1269 if (type & adns_r_unknown) return &typeinfo_unknown;
1271 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1273 while (begin < end) {
1274 mid= begin + ((end-begin)>>1);
1275 if (mid->typekey == type) return mid;
1276 if (type > mid->typekey) begin= mid+1;