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;
261 const struct in_addr *a4;
266 for (i=0, slp=ads->sortlist;
268 (assert(slp->af==AF_INET),
269 !((a4->s_addr & slp->mask.v4.s_addr) == slp->base.v4.s_addr));
274 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
277 if (!ads->nsortlist) return 0;
279 ai= search_sortlist(ads,af,a);
280 bi= search_sortlist(ads,af,b);
284 static int di_inaddr(adns_state ads,
285 const void *datap_a, const void *datap_b) {
286 return dip_genaddr(ads,AF_INET,datap_a,datap_b);
289 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
290 const struct in_addr *rrp= datap, rr= *rrp;
293 ia= inet_ntoa(rr); assert(ia);
299 * _addr (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr)
302 static adns_status pa_addr(const parseinfo *pai, int cbyte,
303 int max, void *datap) {
304 adns_rr_addr *storeto= datap;
305 const byte *dgram= pai->dgram;
307 if (max-cbyte != 4) return adns_s_invaliddata;
308 storeto->len= sizeof(storeto->addr.inet);
309 memset(&storeto->addr,0,sizeof(storeto->addr.inet));
310 storeto->addr.inet.sin_family= AF_INET;
311 memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
315 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
316 assert(sa->sa_family == AF_INET);
317 return search_sortlist(ads, sa->sa_family,
318 &((const struct sockaddr_in *)sa)->sin_addr);
320 static int dip_sockaddr(adns_state ads,
321 const struct sockaddr *sa,
322 const struct sockaddr *sb) {
323 if (!ads->sortlist) return 0;
324 return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
327 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
328 const adns_rr_addr *ap= datap_a, *bp= datap_b;
329 return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
332 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
333 const adns_state ads= context;
335 return di_addr(ads, datap_a, datap_b);
338 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
342 switch (rrp->addr.inet.sin_family) {
345 ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
349 sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
356 static adns_status cs_addr(vbuf *vb, const void *datap) {
357 const adns_rr_addr *rrp= datap;
359 return csp_addr(vb,rrp);
362 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
363 return type & adns__qtf_bigaddr ?
364 sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
368 * _domain (pap,csp,cs)
372 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
373 char **domain_r, parsedomain_flags flags) {
377 st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
378 pai->dgram,pai->dglen, cbyte_io, max);
380 if (!pai->qu->vb.used) return adns_s_invaliddata;
382 dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
385 dm[pai->qu->vb.used]= 0;
386 memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
392 static adns_status csp_domain(vbuf *vb, const char *domain) {
394 if (!*domain) CSP_ADDSTR(".");
398 static adns_status cs_domain(vbuf *vb, const void *datap) {
399 const char *const *domainp= datap;
400 return csp_domain(vb,*domainp);
403 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
404 int max, void *datap) {
408 st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
411 if (cbyte != max) return adns_s_invaliddata;
419 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
420 int max, void *datap) {
424 st= pap_domain(pai, &cbyte, max, rrp,
425 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
428 if (cbyte != max) return adns_s_invaliddata;
433 * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
436 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
438 int *cbyte_io, int count, int dmstart) {
440 int type, class, rdlen, rdstart, ownermatched;
444 for (rri=0, naddrs=-1; rri<count; rri++) {
445 st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
446 pai->dglen, cbyte_io,
447 &type, &class, &ttl, &rdlen, &rdstart,
448 pai->dgram, pai->dglen, dmstart, &ownermatched);
450 if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
451 if (naddrs>0) break; else continue;
456 if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
458 adns__update_expires(pai->qu,ttl,pai->now);
459 st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
464 ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
465 if (!ha->addrs) R_NOMEM;
466 memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
468 ha->astatus= adns_s_ok;
470 adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
476 static void icb_hostaddr(adns_query parent, adns_query child) {
477 adns_answer *cans= child->answer;
478 adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
479 adns_state ads= parent->ads;
481 size_t addrsz= gsz_addr(0, parent->answer->type);
485 rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
486 rrp->addrs= cans->rrs.addr;
487 adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*addrsz);
489 if (parent->children.head) {
490 LIST_LINK_TAIL(ads->childw,parent);
492 adns__query_done(parent);
496 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
497 int max, adns_rr_hostaddr *rrp) {
503 adns_queryflags nflags;
504 size_t addrsz= gsz_addr(0, pai->qu->answer->type);
506 dmstart= cbyte= *cbyte_io;
507 st= pap_domain(pai, &cbyte, max, &rrp->host,
508 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
512 rrp->astatus= adns_s_ok;
518 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
520 if (rrp->naddrs != -1) return adns_s_ok;
522 st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
524 if (rrp->naddrs != -1) return adns_s_ok;
526 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
527 pai->dgram, pai->dglen, dmstart,
528 adns_r_addr, adns_qf_quoteok_query);
532 ctx.callback= icb_hostaddr;
533 ctx.pinfo.hostaddr= rrp;
534 memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
536 nflags= adns_qf_quoteok_query;
537 if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
539 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
540 ((adns_r_addr & adns_rrt_reprmask) |
541 (pai->qu->answer->type & ~adns_rrt_reprmask)),
542 &pai->qu->vb, id, nflags, pai->now, &ctx);
545 nqu->parent= pai->qu;
546 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
551 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
552 int max, void *datap) {
553 adns_rr_hostaddr *rrp= datap;
556 st= pap_hostaddr(pai, &cbyte, max, rrp);
558 if (cbyte != max) return adns_s_invaliddata;
563 static int dip_hostaddr(adns_state ads,
564 const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
565 if (ap->astatus != bp->astatus) return ap->astatus;
566 if (ap->astatus) return 0;
568 return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
571 static int di_hostaddr(adns_state ads,
572 const void *datap_a, const void *datap_b) {
573 const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
575 return dip_hostaddr(ads, ap,bp);
578 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
580 size_t addrsz= gsz_addr(0, qu->answer->type);
582 adns__makefinal_str(qu,&rrp->host);
584 adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
588 static void mf_hostaddr(adns_query qu, void *datap) {
589 adns_rr_hostaddr *rrp= datap;
591 mfp_hostaddr(qu,rrp);
594 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
600 st= csp_domain(vb,rrp->host); if (st) return st;
603 CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
605 sprintf(buf," %d ",rrp->astatus);
608 CSP_ADDSTR(adns_errabbrev(rrp->astatus));
611 errstr= adns_strerror(rrp->astatus);
612 st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st;
614 if (rrp->naddrs >= 0) {
616 for (i=0; i<rrp->naddrs; i++) {
618 st= csp_addr(vb,&rrp->addrs[i]);
627 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
628 const adns_rr_hostaddr *rrp= datap;
630 return csp_hostaddr(vb,rrp);
637 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
638 int max, void *datap) {
639 const byte *dgram= pai->dgram;
640 adns_rr_intstr *rrp= datap;
644 if (cbyte+2 > max) return adns_s_invaliddata;
647 st= pap_domain(pai, &cbyte, max, &rrp->str,
648 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
651 if (cbyte != max) return adns_s_invaliddata;
655 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
656 const adns_rr_intstr *ap= datap_a, *bp= datap_b;
658 if (ap->i < bp->i) return 0;
659 if (ap->i > bp->i) return 1;
667 static adns_status pa_mx(const parseinfo *pai, int cbyte,
668 int max, void *datap) {
669 const byte *dgram= pai->dgram;
670 adns_rr_inthostaddr *rrp= datap;
674 if (cbyte+2 > max) return adns_s_invaliddata;
677 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
680 if (cbyte != max) return adns_s_invaliddata;
684 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
685 const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
687 if (ap->i < bp->i) return 0;
688 if (ap->i > bp->i) return 1;
689 return dip_hostaddr(ads, &ap->ha, &bp->ha);
693 * _inthostaddr (mf,cs)
696 static void mf_inthostaddr(adns_query qu, void *datap) {
697 adns_rr_inthostaddr *rrp= datap;
699 mfp_hostaddr(qu,&rrp->ha);
702 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
703 const adns_rr_inthostaddr *rrp= datap;
706 sprintf(buf,"%u ",rrp->i);
709 return csp_hostaddr(vb,&rrp->ha);
716 static adns_status cs_inthost(vbuf *vb, const void *datap) {
717 const adns_rr_intstr *rrp= datap;
720 sprintf(buf,"%u ",rrp->i);
722 return csp_domain(vb,rrp->str);
726 * _ptr (ckl,pa +icb_ptr)
729 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
730 union checklabel_state *cls, qcontext *ctx,
731 int labnum, const char *label, int lablen) {
732 static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
739 if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
740 memcpy(labbuf, label, lablen);
742 cls->ptr.ipv[3-labnum]= strtoul(labbuf,&ep,10);
743 if (*ep) return adns_s_querydomainwrong;
744 if (lablen>1 && *label=='0') return adns_s_querydomainwrong;
745 } else if (labnum < 4 + sizeof(expectdomain)/sizeof(*expectdomain)) {
746 ed= expectdomain[labnum-4];
748 if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong;
750 if (lablen) return adns_s_querydomainwrong;
751 ctx->tinfo.ptr.addr.af= AF_INET;
752 ctx->tinfo.ptr.addr.addr.v4.s_addr=
753 htonl((cls->ptr.ipv[0]<<24) | (cls->ptr.ipv[1]<<16) |
754 (cls->ptr.ipv[2]<< 8) | (cls->ptr.ipv[3]));
759 static void icb_ptr(adns_query parent, adns_query child) {
760 adns_answer *cans= child->answer;
761 const struct af_addr *queried;
762 const unsigned char *found;
763 adns_state ads= parent->ads;
766 if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
767 adns__query_fail(parent,adns_s_inconsistent);
769 } else if (cans->status) {
770 adns__query_fail(parent,cans->status);
774 queried= &parent->ctx.tinfo.ptr.addr;
775 assert(queried->af == AF_INET);
776 assert(cans->type == adns_r_a);
777 for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
778 if (queried->addr.v4.s_addr == ((const struct in_addr *)found)->s_addr) {
779 if (!parent->children.head) {
780 adns__query_done(parent);
783 LIST_LINK_TAIL(ads->childw,parent);
789 adns__query_fail(parent,adns_s_inconsistent);
792 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
793 int max, void *datap) {
801 st= pap_domain(pai, &cbyte, max, rrp,
802 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
804 if (cbyte != max) return adns_s_invaliddata;
806 st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
807 pai->dgram, pai->dglen, dmstart,
808 adns_r_a, adns_qf_quoteok_query);
812 ctx.callback= icb_ptr;
813 memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
814 memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
815 st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_a),
816 adns_r_a, &pai->qu->vb, id, adns_qf_quoteok_query,
820 nqu->parent= pai->qu;
821 LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
829 static void mf_strpair(adns_query qu, void *datap) {
830 adns_rr_strpair *rrp= datap;
832 adns__makefinal_str(qu,&rrp->array[0]);
833 adns__makefinal_str(qu,&rrp->array[1]);
840 static void mf_intstrpair(adns_query qu, void *datap) {
841 adns_rr_intstrpair *rrp= datap;
843 adns__makefinal_str(qu,&rrp->array[0].str);
844 adns__makefinal_str(qu,&rrp->array[1].str);
851 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
852 int max, void *datap) {
853 adns_rr_intstrpair *rrp= datap;
857 for (i=0; i<2; i++) {
858 st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
862 if (cbyte != max) return adns_s_invaliddata;
868 * _mailbox (pap,cs +pap_mailbox822)
871 static adns_status pap_mailbox822(const parseinfo *pai,
872 int *cbyte_io, int max, char **mb_r) {
873 int lablen, labstart, i, needquote, c, r, neednorm;
874 const unsigned char *p;
882 adns__findlabel_start(&fls, pai->ads,
884 pai->dgram, pai->dglen, max,
885 *cbyte_io, cbyte_io);
886 st= adns__findlabel_next(&fls,&lablen,&labstart);
888 adns__vbuf_appendstr(vb,".");
893 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
895 if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
896 if (c == '.' && !neednorm) neednorm= 1;
897 else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
901 if (needquote || neednorm) {
902 r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
903 adns__vbuf_appendq(vb,"\"",1);
904 for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
906 if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
907 adns__vbuf_appendq(vb,p,1);
909 adns__vbuf_appendq(vb,"\"",1);
911 r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
914 r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
916 st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
920 str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
921 memcpy(str,vb->buf,vb->used);
927 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
929 if (pai->qu->typei->typekey & adns__qtf_mail822) {
930 return pap_mailbox822(pai, cbyte_io, max, mb_r);
932 return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
936 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
937 return csp_domain(vb,mailbox);
944 static adns_status pa_rp(const parseinfo *pai, int cbyte,
945 int max, void *datap) {
946 adns_rr_strpair *rrp= datap;
949 st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
952 st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
955 if (cbyte != max) return adns_s_invaliddata;
959 static adns_status cs_rp(vbuf *vb, const void *datap) {
960 const adns_rr_strpair *rrp= datap;
963 st= csp_mailbox(vb,rrp->array[0]); if (st) return st;
965 st= csp_domain(vb,rrp->array[1]); if (st) return st;
974 static adns_status pa_soa(const parseinfo *pai, int cbyte,
975 int max, void *datap) {
976 adns_rr_soa *rrp= datap;
977 const byte *dgram= pai->dgram;
981 st= pap_domain(pai, &cbyte, max, &rrp->mname,
982 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
985 st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
988 if (cbyte+20 != max) return adns_s_invaliddata;
990 for (i=0; i<5; i++) {
993 (&rrp->serial)[i]= (msw<<16) | lsw;
999 static void mf_soa(adns_query qu, void *datap) {
1000 adns_rr_soa *rrp= datap;
1002 adns__makefinal_str(qu,&rrp->mname);
1003 adns__makefinal_str(qu,&rrp->rname);
1006 static adns_status cs_soa(vbuf *vb, const void *datap) {
1007 const adns_rr_soa *rrp= datap;
1012 st= csp_domain(vb,rrp->mname); if (st) return st;
1014 st= csp_mailbox(vb,rrp->rname); if (st) return st;
1016 for (i=0; i<5; i++) {
1017 sprintf(buf," %lu",(&rrp->serial)[i]);
1025 * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1028 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1029 union checklabel_state *cls, qcontext *ctx,
1030 int labnum, const char *label, int lablen) {
1031 if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1032 if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1035 return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1038 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1040 /* might be adns_rr_srvraw* */) {
1041 const byte *dgram= pai->dgram;
1045 if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1047 rrp->priority= GET_W(cbyte, ti);
1048 rrp->weight= GET_W(cbyte, ti);
1049 rrp->port= GET_W(cbyte, ti);
1053 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1054 int max, void *datap) {
1055 adns_rr_srvraw *rrp= datap;
1058 st= pap_srv_begin(pai,&cbyte,max,datap);
1061 st= pap_domain(pai, &cbyte, max, &rrp->host,
1062 pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1065 if (cbyte != max) return adns_s_invaliddata;
1069 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1070 int max, void *datap) {
1071 adns_rr_srvha *rrp= datap;
1074 st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st;
1075 st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st;
1076 if (cbyte != max) return adns_s_invaliddata;
1080 static void mf_srvraw(adns_query qu, void *datap) {
1081 adns_rr_srvraw *rrp= datap;
1082 adns__makefinal_str(qu, &rrp->host);
1085 static void mf_srvha(adns_query qu, void *datap) {
1086 adns_rr_srvha *rrp= datap;
1087 mfp_hostaddr(qu,&rrp->ha);
1090 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1091 const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1092 /* might be const adns_rr_svhostaddr* */
1094 if (ap->priority < bp->priority) return 0;
1095 if (ap->priority > bp->priority) return 1;
1099 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1100 /* might be adns_rr_srvraw* */) {
1102 sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1107 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1108 const adns_rr_srvraw *rrp= datap;
1111 st= csp_srv_begin(vb,(const void*)rrp); if (st) return st;
1112 return csp_domain(vb,rrp->host);
1115 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1116 const adns_rr_srvha *rrp= datap;
1119 st= csp_srv_begin(vb,(const void*)datap); if (st) return st;
1120 return csp_hostaddr(vb,&rrp->ha);
1123 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1124 const struct typeinfo *typei) {
1125 /* we treat everything in the array as if it were an adns_rr_srvha
1126 * even though the array might be of adns_rr_srvraw. That's OK
1127 * because they have the same prefix, which is all we access.
1128 * We use rrsz, too, rather than naive array indexing, of course.
1130 char *workbegin, *workend, *search, *arrayend;
1131 const adns_rr_srvha *rr;
1132 union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1133 int cpriority, totalweight, runtotal;
1136 assert(rrsz <= sizeof(rrtmp));
1137 for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1138 workbegin < arrayend;
1139 workbegin= workend) {
1140 cpriority= (rr=(void*)workbegin)->priority;
1142 for (workend= workbegin, totalweight= 0;
1143 workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1145 totalweight += rr->weight;
1148 /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1149 * cpriority. From now on, workbegin points to the `remaining'
1150 * records: we select one record at a time (RFC2782 `Usage rules'
1151 * and `Format of the SRV RR' subsection `Weight') to place at
1152 * workbegin (swapping with the one that was there, and then
1153 * advance workbegin. */
1155 workbegin + rrsz < workend; /* don't bother if just one */
1156 workbegin += rrsz) {
1158 randval= nrand48(ads->rand48xsubi);
1159 randval %= (totalweight + 1);
1160 /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1161 * totalweight must be <= 2^26 so probability nonuniformity is
1162 * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1163 * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1166 for (search=workbegin, runtotal=0;
1167 (runtotal += (rr=(void*)search)->weight) < randval;
1169 assert(search < arrayend);
1170 totalweight -= rr->weight;
1171 if (search != workbegin) {
1172 memcpy(&rrtmp, workbegin, rrsz);
1173 memcpy(workbegin, search, rrsz);
1174 memcpy(search, &rrtmp, rrsz);
1179 * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1180 * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1181 * ./adnshost_s -t srv- _jabber._tcp.jabber.org
1189 static void mf_byteblock(adns_query qu, void *datap) {
1190 adns_rr_byteblock *rrp= datap;
1191 void *bytes= rrp->data;
1192 adns__makefinal_block(qu,&bytes,rrp->len);
1200 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1201 int max, void *datap) {
1202 adns_rr_byteblock *rrp= datap;
1204 rrp->len= max - cbyte;
1205 rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1206 if (!rrp->data) R_NOMEM;
1207 memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1211 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1212 const adns_rr_byteblock *rrp= datap;
1217 sprintf(buf,"\\# %d",rrp->len);
1220 for (l= rrp->len, p= rrp->data;
1223 sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1229 sprintf(buf," %02x",*p);
1239 static void mf_flat(adns_query qu, void *data) { }
1245 #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member))
1247 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1248 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \
1249 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1250 adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1251 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \
1252 { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \
1253 GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \
1254 adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1258 static const typeinfo typeinfos[] = {
1259 /* Must be in ascending order of rrtype ! */
1260 /* mem-mgmt code rrt fmt member parser comparer printer */
1262 FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ),
1263 DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ),
1264 DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ),
1265 DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ),
1266 DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ),
1267 DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ),
1268 DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ),
1269 DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ),
1270 DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ),
1271 DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw,
1272 .checklabel= ckl_srv, .postsort= postsort_srv),
1274 FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr,
1275 .getrrsz= gsz_addr),
1276 DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ),
1277 DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain,
1278 .checklabel= ckl_ptr),
1279 DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ),
1280 DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha,
1281 .checklabel= ckl_srv, .postsort= postsort_srv),
1283 DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ),
1284 DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ),
1287 static const typeinfo typeinfo_unknown=
1288 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque );
1290 const typeinfo *adns__findtype(adns_rrtype type) {
1291 const typeinfo *begin, *end, *mid;
1293 if (type & adns_r_unknown) return &typeinfo_unknown;
1294 type &= adns_rrt_reprmask;
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;