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,di,cs +search_sortlist, dip_genaddr)
51 * _addr (pa,di,div,csp,cs,gsz
52 * +search_sortlist_sa, dip_sockaddr)
53 * _domain (pap,csp,cs)
56 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs
57 * +pap_findaddrs, icb_hostaddr)
60 * _inthostaddr (mf,cs)
62 * _ptr (ckl,pa +icb_ptr)
66 * _mailbox (pap,csp +pap_mailbox822)
69 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
74 * within each section:
92 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
93 int *len_r, char **str_r) {
94 /* Neither len_r nor str_r may be null.
95 * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
97 const byte *dgram= pai->dgram;
103 if (cbyte >= max) return adns_s_invaliddata;
105 if (cbyte+l > max) return adns_s_invaliddata;
107 str= adns__alloc_interim(pai->qu, l+1);
111 memcpy(str,dgram+cbyte,l);
120 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
126 for (cn=0; cn<len; cn++) {
130 } else if (ch == '"') {
132 } else if (ch >= 32 && ch <= 126) {
133 if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
135 sprintf(buf,"\\x%02x",ch);
148 static void mf_str(adns_query qu, void *datap) {
151 adns__makefinal_str(qu,rrp);
158 static void mf_intstr(adns_query qu, void *datap) {
159 adns_rr_intstr *rrp= datap;
161 adns__makefinal_str(qu,&rrp->str);
168 static void mf_manyistr(adns_query qu, void *datap) {
169 adns_rr_intstr **rrp= datap;
170 adns_rr_intstr *te, *table;
174 for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
176 adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
178 for (te= *rrp; te->i >= 0; te++)
179 adns__makefinal_str(qu,&te->str);
186 static adns_status pa_txt(const parseinfo *pai, int cbyte,
187 int max, void *datap) {
188 adns_rr_intstr **rrp= datap, *table, *te;
189 const byte *dgram= pai->dgram;
190 int ti, tc, l, startbyte;
194 if (cbyte >= max) return adns_s_invaliddata;
196 while (cbyte < max) {
201 if (cbyte != max || !tc) return adns_s_invaliddata;
203 table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
206 for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
207 st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
210 assert(cbyte == max);
219 static adns_status cs_txt(vbuf *vb, const void *datap) {
220 const adns_rr_intstr *const *rrp= datap;
221 const adns_rr_intstr *current;
225 for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) {
226 if (spc) CSP_ADDSTR(" ");
227 st= csp_qstring(vb,current->str,current->i); if (st) return st;
236 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
237 const adns_rr_intstrpair *rrp= datap;
240 st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st;
242 st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st;
247 * _inaddr (pa,di,cs +search_sortlist, dip_genaddr)
250 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
251 int max, void *datap) {
252 struct in_addr *storeto= datap;
254 if (max-cbyte != 4) return adns_s_invaliddata;
255 memcpy(storeto, pai->dgram + cbyte, 4);
259 static int search_sortlist(adns_state ads, int af, const void *ad) {
260 const struct sortlist *slp;
263 for (i=0, slp=ads->sortlist;
265 !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask);
270 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
273 if (!ads->nsortlist) return 0;
275 ai= search_sortlist(ads,af,a);
276 bi= search_sortlist(ads,af,b);
280 static int di_inaddr(adns_state ads,
281 const void *datap_a, const void *datap_b) {
282 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
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,gsz +search_sortlist_sa, dip_sockaddr)
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 search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
313 adns__sockaddr_extract(sa, &a, 0);
314 return search_sortlist(ads, sa->sa_family, &a);
317 static int dip_sockaddr(adns_state ads,
318 const struct sockaddr *sa,
319 const struct sockaddr *sb) {
320 if (!ads->sortlist) return 0;
321 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
324 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
325 const adns_rr_addr *ap= datap_a, *bp= datap_b;
326 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
329 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
330 const adns_state ads= context;
332 return di_addr(ads, datap_a, datap_b);
335 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
339 switch (rrp->addr.inet.sin_family) {
342 ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
346 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
353 static adns_status cs_addr(vbuf *vb, const void *datap) {
354 const adns_rr_addr *rrp= datap;
356 return csp_addr(vb,rrp);
359 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
360 return type & adns__qtf_bigaddr ?
361 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
365 * _domain (pap,csp,cs)
369 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
370 char **domain_r, parsedomain_flags flags) {
374 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
375 pai->dgram,pai->dglen, cbyte_io, max);
377 if (!pai->qu->vb.used) return adns_s_invaliddata;
379 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
382 dm[pai->qu->vb.used]= 0;
383 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
389 static adns_status csp_domain(vbuf *vb, const char *domain) {
391 if (!*domain) CSP_ADDSTR(".");
395 static adns_status cs_domain(vbuf *vb, const void *datap) {
396 const char *const *domainp= datap;
397 return csp_domain(vb,*domainp);
400 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
401 int max, void *datap) {
405 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
408 if (cbyte != max) return adns_s_invaliddata;
416 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
417 int max, void *datap) {
421 st= pap_domain(pai, &cbyte, max, rrp,
422 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
425 if (cbyte != max) return adns_s_invaliddata;
430 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
433 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
435 int *cbyte_io, int count, int dmstart) {
437 int type, class, rdlen, rdstart, ownermatched;
441 for (rri=0, naddrs=-1; rri<count; rri++) {
442 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
443 pai->dglen, cbyte_io,
444 &type, &class, &ttl, &rdlen, &rdstart,
445 pai->dgram, pai->dglen, dmstart, &ownermatched);
447 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
448 if (naddrs>0) break; else continue;
453 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
455 adns__update_expires(pai->qu,ttl,pai->now);
456 st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
461 ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
462 if (!ha->addrs) R_NOMEM;
463 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
465 ha->astatus= adns_s_ok;
467 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
473 static void icb_hostaddr(adns_query parent, adns_query child) {
474 adns_answer *cans= child->answer;
475 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
476 adns_state ads= parent->ads;
478 size_t addrsz= gsz_addr(0, parent->answer->type);
482 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
483 rrp->addrs= cans->rrs.addr;
484 adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*addrsz);
486 if (parent->children.head) {
487 LIST_LINK_TAIL(ads->childw,parent);
489 adns__query_done(parent);
493 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
494 int max, adns_rr_hostaddr *rrp) {
500 adns_queryflags nflags;
501 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
503 dmstart= cbyte= *cbyte_io;
504 st= pap_domain(pai, &cbyte, max, &rrp->host,
505 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
509 rrp->astatus= adns_s_ok;
515 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
517 if (rrp->naddrs != -1) return adns_s_ok;
519 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
521 if (rrp->naddrs != -1) return adns_s_ok;
523 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
524 pai->dgram, pai->dglen, dmstart,
525 adns_r_addr, adns_qf_quoteok_query);
529 ctx.callback= icb_hostaddr;
530 ctx.pinfo.hostaddr= rrp;
531 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
533 nflags= adns_qf_quoteok_query;
534 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
536 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
537 ((adns_r_addr & adns_rrt_reprmask) |
538 (pai->qu->answer->type & ~adns_rrt_reprmask)),
539 &pai->qu->vb, id, nflags, pai->now, &ctx);
542 nqu->parent= pai->qu;
543 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
548 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
549 int max, void *datap) {
550 adns_rr_hostaddr *rrp= datap;
553 st= pap_hostaddr(pai, &cbyte, max, rrp);
555 if (cbyte != max) return adns_s_invaliddata;
560 static int dip_hostaddr(adns_state ads,
561 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
562 if (ap->astatus != bp->astatus) return ap->astatus;
563 if (ap->astatus) return 0;
565 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
568 static int di_hostaddr(adns_state ads,
569 const void *datap_a, const void *datap_b) {
570 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
572 return dip_hostaddr(ads, ap,bp);
575 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
577 size_t addrsz= gsz_addr(0, qu->answer->type);
579 adns__makefinal_str(qu,&rrp->host);
581 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
585 static void mf_hostaddr(adns_query qu, void *datap) {
586 adns_rr_hostaddr *rrp= datap;
588 mfp_hostaddr(qu,rrp);
591 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
597 st= csp_domain(vb,rrp->host); if (st) return st;
600 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
602 sprintf(buf," %d ",rrp->astatus);
605 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
608 errstr= adns_strerror(rrp->astatus);
609 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
611 if (rrp->naddrs >= 0) {
613 for (i=0; i<rrp->naddrs; i++) {
615 st= csp_addr(vb,&rrp->addrs[i]);
624 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
625 const adns_rr_hostaddr *rrp= datap;
627 return csp_hostaddr(vb,rrp);
634 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
635 int max, void *datap) {
636 const byte *dgram= pai->dgram;
637 adns_rr_intstr *rrp= datap;
641 if (cbyte+2 > max) return adns_s_invaliddata;
644 st= pap_domain(pai, &cbyte, max, &rrp->str,
645 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
648 if (cbyte != max) return adns_s_invaliddata;
652 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
653 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
655 if (ap->i < bp->i) return 0;
656 if (ap->i > bp->i) return 1;
664 static adns_status pa_mx(const parseinfo *pai, int cbyte,
665 int max, void *datap) {
666 const byte *dgram= pai->dgram;
667 adns_rr_inthostaddr *rrp= datap;
671 if (cbyte+2 > max) return adns_s_invaliddata;
674 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
677 if (cbyte != max) return adns_s_invaliddata;
681 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
682 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
684 if (ap->i < bp->i) return 0;
685 if (ap->i > bp->i) return 1;
686 return dip_hostaddr(ads, &ap->ha, &bp->ha);
690 * _inthostaddr (mf,cs)
693 static void mf_inthostaddr(adns_query qu, void *datap) {
694 adns_rr_inthostaddr *rrp= datap;
696 mfp_hostaddr(qu,&rrp->ha);
699 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
700 const adns_rr_inthostaddr *rrp= datap;
703 sprintf(buf,"%u ",rrp->i);
706 return csp_hostaddr(vb,&rrp->ha);
713 static adns_status cs_inthost(vbuf *vb, const void *datap) {
714 const adns_rr_intstr *rrp= datap;
717 sprintf(buf,"%u ",rrp->i);
719 return csp_domain(vb,rrp->str);
723 * _ptr (ckl,pa +icb_ptr)
726 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
727 union checklabel_state *cls, qcontext *ctx,
728 int labnum, const char *label, int lablen) {
729 static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
736 if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
737 memcpy(labbuf, label, lablen);
739 cls->ptr.ipv[3-labnum]= strtoul(labbuf,&ep,10);
740 if (*ep) return adns_s_querydomainwrong;
741 if (lablen>1 && *label=='0') return adns_s_querydomainwrong;
742 } else if (labnum < 4 + sizeof(expectdomain)/sizeof(*expectdomain)) {
743 ed= expectdomain[labnum-4];
745 if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong;
747 if (lablen) return adns_s_querydomainwrong;
748 ctx->tinfo.ptr.addr.af= AF_INET;
749 ctx->tinfo.ptr.addr.addr.v4.s_addr=
750 htonl((cls->ptr.ipv[0]<<24) | (cls->ptr.ipv[1]<<16) |
751 (cls->ptr.ipv[2]<< 8) | (cls->ptr.ipv[3]));
756 static void icb_ptr(adns_query parent, adns_query child) {
757 adns_answer *cans= child->answer;
758 const struct af_addr *queried;
759 const unsigned char *found;
760 adns_state ads= parent->ads;
763 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
764 adns__query_fail(parent,adns_s_inconsistent);
766 } else if (cans->status) {
767 adns__query_fail(parent,cans->status);
771 queried= &parent->ctx.tinfo.ptr.addr;
772 assert(cans->type == adns_r_a);
773 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
774 if (adns__genaddr_equal_p(queried->af,&queried->addr, AF_INET,found)) {
775 if (!parent->children.head) {
776 adns__query_done(parent);
779 LIST_LINK_TAIL(ads->childw,parent);
785 adns__query_fail(parent,adns_s_inconsistent);
788 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
789 int max, void *datap) {
797 st= pap_domain(pai, &cbyte, max, rrp,
798 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
800 if (cbyte != max) return adns_s_invaliddata;
802 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
803 pai->dgram, pai->dglen, dmstart,
804 adns_r_a, adns_qf_quoteok_query);
808 ctx.callback= icb_ptr;
809 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
810 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
811 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_a),
812 adns_r_a, &pai->qu->vb, id, adns_qf_quoteok_query,
816 nqu->parent= pai->qu;
817 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
825 static void mf_strpair(adns_query qu, void *datap) {
826 adns_rr_strpair *rrp= datap;
828 adns__makefinal_str(qu,&rrp->array[0]);
829 adns__makefinal_str(qu,&rrp->array[1]);
836 static void mf_intstrpair(adns_query qu, void *datap) {
837 adns_rr_intstrpair *rrp= datap;
839 adns__makefinal_str(qu,&rrp->array[0].str);
840 adns__makefinal_str(qu,&rrp->array[1].str);
847 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
848 int max, void *datap) {
849 adns_rr_intstrpair *rrp= datap;
853 for (i=0; i<2; i++) {
854 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
858 if (cbyte != max) return adns_s_invaliddata;
864 * _mailbox (pap,cs +pap_mailbox822)
867 static adns_status pap_mailbox822(const parseinfo *pai,
868 int *cbyte_io, int max, char **mb_r) {
869 int lablen, labstart, i, needquote, c, r, neednorm;
870 const unsigned char *p;
878 adns__findlabel_start(&fls, pai->ads,
880 pai->dgram, pai->dglen, max,
881 *cbyte_io, cbyte_io);
882 st= adns__findlabel_next(&fls,&lablen,&labstart);
884 adns__vbuf_appendstr(vb,".");
889 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
891 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
892 if (c == '.' && !neednorm) neednorm= 1;
893 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
897 if (needquote || neednorm) {
898 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
899 adns__vbuf_appendq(vb,"\"",1);
900 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
902 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
903 adns__vbuf_appendq(vb,p,1);
905 adns__vbuf_appendq(vb,"\"",1);
907 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
910 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
912 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
916 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
917 memcpy(str,vb->buf,vb->used);
923 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
925 if (pai->qu->typei->typekey & adns__qtf_mail822) {
926 return pap_mailbox822(pai, cbyte_io, max, mb_r);
928 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
932 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
933 return csp_domain(vb,mailbox);
940 static adns_status pa_rp(const parseinfo *pai, int cbyte,
941 int max, void *datap) {
942 adns_rr_strpair *rrp= datap;
945 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
948 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
951 if (cbyte != max) return adns_s_invaliddata;
955 static adns_status cs_rp(vbuf *vb, const void *datap) {
956 const adns_rr_strpair *rrp= datap;
959 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
961 st= csp_domain(vb,rrp->array[1]); if (st) return st;
970 static adns_status pa_soa(const parseinfo *pai, int cbyte,
971 int max, void *datap) {
972 adns_rr_soa *rrp= datap;
973 const byte *dgram= pai->dgram;
977 st= pap_domain(pai, &cbyte, max, &rrp->mname,
978 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
981 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
984 if (cbyte+20 != max) return adns_s_invaliddata;
986 for (i=0; i<5; i++) {
989 (&rrp->serial)[i]= (msw<<16) | lsw;
995 static void mf_soa(adns_query qu, void *datap) {
996 adns_rr_soa *rrp= datap;
998 adns__makefinal_str(qu,&rrp->mname);
999 adns__makefinal_str(qu,&rrp->rname);
1002 static adns_status cs_soa(vbuf *vb, const void *datap) {
1003 const adns_rr_soa *rrp= datap;
1008 st= csp_domain(vb,rrp->mname); if (st) return st;
1010 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1012 for (i=0; i<5; i++) {
1013 sprintf(buf," %lu",(&rrp->serial)[i]);
1021 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1024 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1025 union checklabel_state *cls, qcontext *ctx,
1026 int labnum, const char *label, int lablen) {
1027 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1028 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1031 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1034 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1036 /* might be adns_rr_srvraw* */) {
1037 const byte *dgram= pai->dgram;
1041 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1043 rrp->priority= GET_W(cbyte, ti);
1044 rrp->weight= GET_W(cbyte, ti);
1045 rrp->port= GET_W(cbyte, ti);
1049 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1050 int max, void *datap) {
1051 adns_rr_srvraw *rrp= datap;
1054 st= pap_srv_begin(pai,&cbyte,max,datap);
1057 st= pap_domain(pai, &cbyte, max, &rrp->host,
1058 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1061 if (cbyte != max) return adns_s_invaliddata;
1065 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1066 int max, void *datap) {
1067 adns_rr_srvha *rrp= datap;
1070 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1071 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1072 if (cbyte != max) return adns_s_invaliddata;
1076 static void mf_srvraw(adns_query qu, void *datap) {
1077 adns_rr_srvraw *rrp= datap;
1078 adns__makefinal_str(qu, &rrp->host);
1081 static void mf_srvha(adns_query qu, void *datap) {
1082 adns_rr_srvha *rrp= datap;
1083 mfp_hostaddr(qu,&rrp->ha);
1086 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1087 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1088 /* might be const adns_rr_svhostaddr* */
1090 if (ap->priority < bp->priority) return 0;
1091 if (ap->priority > bp->priority) return 1;
1095 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1096 /* might be adns_rr_srvraw* */) {
1098 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1103 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1104 const adns_rr_srvraw *rrp= datap;
1107 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1108 return csp_domain(vb,rrp->host);
1111 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1112 const adns_rr_srvha *rrp= datap;
1115 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1116 return csp_hostaddr(vb,&rrp->ha);
1119 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1120 const struct typeinfo *typei) {
1121 /* we treat everything in the array as if it were an adns_rr_srvha
1122 * even though the array might be of adns_rr_srvraw. That's OK
1123 * because they have the same prefix, which is all we access.
1124 * We use rrsz, too, rather than naive array indexing, of course.
1126 char *workbegin, *workend, *search, *arrayend;
1127 const adns_rr_srvha *rr;
1128 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1129 int cpriority, totalweight, runtotal;
1132 assert(rrsz <= sizeof(rrtmp));
1133 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1134 workbegin < arrayend;
1135 workbegin= workend) {
1136 cpriority= (rr=(void*)workbegin)->priority;
1138 for (workend= workbegin, totalweight= 0;
1139 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1141 totalweight += rr->weight;
1144 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1145 * cpriority. From now on, workbegin points to the `remaining'
1146 * records: we select one record at a time (RFC2782 `Usage rules'
1147 * and `Format of the SRV RR' subsection `Weight') to place at
1148 * workbegin (swapping with the one that was there, and then
1149 * advance workbegin. */
1151 workbegin + rrsz < workend; /* don't bother if just one */
1152 workbegin += rrsz) {
1154 randval= nrand48(ads->rand48xsubi);
1155 randval %= (totalweight + 1);
1156 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1157 * totalweight must be <= 2^26 so probability nonuniformity is
1158 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1159 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1162 for (search=workbegin, runtotal=0;
1163 (runtotal += (rr=(void*)search)->weight) < randval;
1165 assert(search < arrayend);
1166 totalweight -= rr->weight;
1167 if (search != workbegin) {
1168 memcpy(&rrtmp, workbegin, rrsz);
1169 memcpy(workbegin, search, rrsz);
1170 memcpy(search, &rrtmp, rrsz);
1175 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1176 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1177 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1185 static void mf_byteblock(adns_query qu, void *datap) {
1186 adns_rr_byteblock *rrp= datap;
1187 void *bytes= rrp->data;
1188 adns__makefinal_block(qu,&bytes,rrp->len);
1196 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1197 int max, void *datap) {
1198 adns_rr_byteblock *rrp= datap;
1200 rrp->len= max - cbyte;
1201 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1202 if (!rrp->data) R_NOMEM;
1203 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1207 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1208 const adns_rr_byteblock *rrp= datap;
1213 sprintf(buf,"\\# %d",rrp->len);
1216 for (l= rrp->len, p= rrp->data;
1219 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1225 sprintf(buf," %02x",*p);
1235 static void mf_flat(adns_query qu, void *data) { }
1241 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1243 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1244 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1245 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1246 adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1247 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1248 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1249 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1250 adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1254 static const typeinfo typeinfos[] = {
1255 /* Must be in ascending order of rrtype ! */
1256 /* mem-mgmt code rrt fmt member parser comparer printer */
1258 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1259 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1260 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1261 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1262 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1263 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1264 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1265 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1266 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1267 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1268 .checklabel= ckl_srv, .postsort= postsort_srv),
1270 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1271 .getrrsz= gsz_addr),
1272 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1273 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1274 .checklabel= ckl_ptr),
1275 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1276 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1277 .checklabel= ckl_srv, .postsort= postsort_srv),
1279 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1280 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1283 static const typeinfo typeinfo_unknown=
1284 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1286 const typeinfo *adns__findtype(adns_rrtype type) {
1287 const typeinfo *begin, *end, *mid;
1289 if (type & adns_r_unknown) return &typeinfo_unknown;
1290 type &= adns_rrt_reprmask;
1292 begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1294 while (begin < end) {
1295 mid= begin + ((end-begin)>>1);
1296 if (mid->typekey == type) return mid;
1297 if (type > mid->typekey) begin= mid+1;