mdw@git.distorted.org.uk Git - adns/blob - src/types.c

   1 /*
   2  * types.c
   3  * - RR-type-specific code, and the machinery to call it
   4  */
   5 /*
   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.)
  11  *
  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)
  15  *  any later version.
  16  *
  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.
  21  *
  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.
  25  */
  26
  27 #include <stdlib.h>
  28
  29 #include <sys/types.h>
  30 #include <sys/socket.h>
  31 #include <netinet/in.h>
  32 #include <arpa/inet.h>
  33
  34 #include "internal.h"
  35
  36 #define R_NOMEM       return adns_s_nomemory
  37 #define CSP_ADDSTR(s) do {                      \
  38     if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
  39   } while (0)
  40
  41 /*
  42  * order of sections:
  43  *
  44  * _string                    (pap)
  45  * _textdata, _qstring        (csp)
  46  * _str                       (mf,cs)
  47  * _intstr                    (mf,csp,cs)
  48  * _manyistr                  (mf,cs)
  49  * _txt                       (pa)
  50  * _inaddr                    (pa,di,cs
  51  *                              +search_sortlist, dip_genaddr, csp_genaddr)
  52  * _in6addr                   (pa,di,cs)
  53  * _addr                      (pa,di,div,csp,cs,gsz
  54  *                              +search_sortlist_sa, dip_sockaddr)
  55  * _domain                    (pap,csp,cs)
  56  * _dom_raw                   (pa)
  57  * _host_raw                  (pa)
  58  * _hostaddr                  (pap,pa,dip,di,mfp,mf,csp,cs
  59  *                              +pap_findaddrs, icb_hostaddr)
  60  * _mx_raw                    (pa,di)
  61  * _mx                        (pa,di)
  62  * _inthostaddr               (mf,cs)
  63  * _inthost                   (cs)
  64  * _ptr                       (ckl,pa +icb_ptr)
  65  * _strpair                   (mf)
  66  * _intstrpair                (mf)
  67  * _hinfo                     (pa)
  68  * _mailbox                   (pap,csp +pap_mailbox822)
  69  * _rp                        (pa,cs)
  70  * _soa                       (pa,mf,cs)
  71  * _srv*                      (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
  72  * _byteblock                 (mf)
  73  * _opaque                    (pa,cs)
  74  * _flat                      (mf)
  75  *
  76  * within each section:
  77  *    ckl_*
  78  *    pap_*
  79  *    pa_*
  80  *    dip_*
  81  *    di_*
  82  *    mfp_*
  83  *    mf_*
  84  *    csp_*
  85  *    cs_*
  86  *    gsz_*
  87  *    postsort_*
  88  */
  89
  90 /*
  91  * _qstring               (pap,csp)
  92  */
  93
  94 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
  95                               int *len_r, char **str_r) {
  96   /* Neither len_r nor str_r may be null.
  97    * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
  98    */
  99   const byte *dgram= pai->dgram;
 100   int l, cbyte;
 101   char *str;
 102
 103   cbyte= *cbyte_io;
 104
 105   if (cbyte >= max) return adns_s_invaliddata;
 106   GET_B(cbyte,l);
 107   if (cbyte+l > max) return adns_s_invaliddata;
 108
 109   str= adns__alloc_interim(pai->qu, l+1);
 110   if (!str) R_NOMEM;
 111
 112   str[l]= 0;
 113   memcpy(str,dgram+cbyte,l);
 114
 115   *len_r= l;
 116   *str_r= str;
 117   *cbyte_io= cbyte+l;
 118
 119   return adns_s_ok;
 120 }
 121
 122 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
 123   unsigned char ch;
 124   char buf[10];
 125   int cn;
 126
 127   CSP_ADDSTR("\"");
 128   for (cn=0; cn<len; cn++) {
 129     ch= *dp++;
 130     if (ch == '\\') {
 131       CSP_ADDSTR("\\\\");
 132     } else if (ch == '"') {
 133       CSP_ADDSTR("\\\"");
 134     } else if (ch >= 32 && ch <= 126) {
 135       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 136     } else {
 137       sprintf(buf,"\\x%02x",ch);
 138       CSP_ADDSTR(buf);
 139     }
 140   }
 141   CSP_ADDSTR("\"");
 142
 143   return adns_s_ok;
 144 }
 145
 146 /*
 147  * _str  (mf)
 148  */
 149
 150 static void mf_str(adns_query qu, void *datap) {
 151   char **rrp= datap;
 152
 153   adns__makefinal_str(qu,rrp);
 154 }
 155
 156 /*
 157  * _intstr  (mf)
 158  */
 159
 160 static void mf_intstr(adns_query qu, void *datap) {
 161   adns_rr_intstr *rrp= datap;
 162
 163   adns__makefinal_str(qu,&rrp->str);
 164 }
 165
 166 /*
 167  * _manyistr   (mf)
 168  */
 169
 170 static void mf_manyistr(adns_query qu, void *datap) {
 171   adns_rr_intstr **rrp= datap;
 172   adns_rr_intstr *te, *table;
 173   void *tablev;
 174   int tc;
 175
 176   for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
 177   tablev= *rrp;
 178   adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
 179   *rrp= table= tablev;
 180   for (te= *rrp; te->i >= 0; te++)
 181     adns__makefinal_str(qu,&te->str);
 182 }
 183
 184 /*
 185  * _txt   (pa,cs)
 186  */
 187
 188 static adns_status pa_txt(const parseinfo *pai, int cbyte,
 189                           int max, void *datap) {
 190   adns_rr_intstr **rrp= datap, *table, *te;
 191   const byte *dgram= pai->dgram;
 192   int ti, tc, l, startbyte;
 193   adns_status st;
 194
 195   startbyte= cbyte;
 196   if (cbyte >= max) return adns_s_invaliddata;
 197   tc= 0;
 198   while (cbyte < max) {
 199     GET_B(cbyte,l);
 200     cbyte+= l;
 201     tc++;
 202   }
 203   if (cbyte != max || !tc) return adns_s_invaliddata;
 204
 205   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 206   if (!table) R_NOMEM;
 207
 208   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 209     st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
 210     if (st) return st;
 211   }
 212   assert(cbyte == max);
 213
 214   te->i= -1;
 215   te->str= 0;
 216
 217   *rrp= table;
 218   return adns_s_ok;
 219 }
 220
 221 static adns_status cs_txt(vbuf *vb, const void *datap) {
 222   const adns_rr_intstr *const *rrp= datap;
 223   const adns_rr_intstr *current;
 224   adns_status st;
 225   int spc;
 226
 227   for (current= *rrp, spc=0;  current->i >= 0;  current++, spc=1) {
 228     if (spc) CSP_ADDSTR(" ");
 229     st= csp_qstring(vb,current->str,current->i); if (st) return st;
 230   }
 231   return adns_s_ok;
 232 }
 233
 234 /*
 235  * _hinfo   (cs)
 236  */
 237
 238 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
 239   const adns_rr_intstrpair *rrp= datap;
 240   adns_status st;
 241
 242   st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i);  if (st) return st;
 243   CSP_ADDSTR(" ");
 244   st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i);  if (st) return st;
 245   return adns_s_ok;
 246 }
 247
 248 /*
 249  * _inaddr   (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
 250  */
 251
 252 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
 253                              int max, void *datap) {
 254   struct in_addr *storeto= datap;
 255
 256   if (max-cbyte != 4) return adns_s_invaliddata;
 257   memcpy(storeto, pai->dgram + cbyte, 4);
 258   return adns_s_ok;
 259 }
 260
 261 static int search_sortlist(adns_state ads, int af, const void *ad) {
 262   const struct sortlist *slp;
 263   int i;
 264
 265   for (i=0, slp=ads->sortlist;
 266        i<ads->nsortlist &&
 267          !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask);
 268        i++, slp++);
 269   return i;
 270 }
 271
 272 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
 273   int ai, bi;
 274
 275   if (!ads->nsortlist) return 0;
 276
 277   ai= search_sortlist(ads,af,a);
 278   bi= search_sortlist(ads,af,b);
 279   return bi<ai;
 280 }
 281
 282 static int di_inaddr(adns_state ads,
 283                      const void *datap_a, const void *datap_b) {
 284   return dip_genaddr(ads,AF_INET,datap_a,datap_b);
 285 }
 286
 287 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
 288   char buf[ADNS_ADDR2TEXT_BUFLEN];
 289   int len= sizeof(buf);
 290   adns_rr_addr a;
 291   int err;
 292
 293   memset(&a, 0, sizeof(a));
 294   a.addr.sa.sa_family= af;
 295   adns__sockaddr_inject(p, 0, &a.addr.sa);
 296   err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
 297   CSP_ADDSTR(buf);
 298   return adns_s_ok;
 299 }
 300
 301 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 302   return csp_genaddr(vb, AF_INET,datap);
 303 }
 304
 305 /*
 306  * _in6addr   (pa,di,cs)
 307  */
 308
 309 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
 310                              int max, void *datap) {
 311   struct in6_addr *storeto= datap;
 312
 313   if (max-cbyte != 16) return adns_s_invaliddata;
 314   memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
 315   return adns_s_ok;
 316 }
 317
 318 static int di_in6addr(adns_state ads,
 319                      const void *datap_a, const void *datap_b) {
 320   return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
 321 }
 322
 323 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
 324   return csp_genaddr(vb,AF_INET6,datap);
 325 }
 326
 327 /*
 328  * _addr   (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr)
 329  */
 330
 331 static adns_status pa_addr(const parseinfo *pai, int cbyte,
 332                            int max, void *datap) {
 333   adns_rr_addr *storeto= datap;
 334   const byte *dgram= pai->dgram;
 335
 336   if (max-cbyte != 4) return adns_s_invaliddata;
 337   storeto->len= sizeof(storeto->addr.inet);
 338   memset(&storeto->addr,0,sizeof(storeto->addr.inet));
 339   storeto->addr.inet.sin_family= AF_INET;
 340   memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
 341   return adns_s_ok;
 342 }
 343
 344 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
 345   union gen_addr a;
 346   adns__sockaddr_extract(sa, &a, 0);
 347   return search_sortlist(ads, sa->sa_family, &a);
 348 }
 349
 350 static int dip_sockaddr(adns_state ads,
 351                         const struct sockaddr *sa,
 352                         const struct sockaddr *sb) {
 353   if (!ads->sortlist) return 0;
 354   return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
 355 }
 356
 357 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 358   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 359   return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
 360 }
 361
 362 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 363   const adns_state ads= context;
 364
 365   return di_addr(ads, datap_a, datap_b);
 366 }
 367
 368 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 369   char buf[ADNS_ADDR2TEXT_BUFLEN];
 370   int len= sizeof(buf);
 371   int err;
 372
 373   switch (rrp->addr.inet.sin_family) {
 374   case AF_INET:
 375     CSP_ADDSTR("INET ");
 376     goto a2t;
 377   case AF_INET6:
 378     CSP_ADDSTR("INET6 ");
 379     goto a2t;
 380   a2t:
 381     err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
 382     CSP_ADDSTR(buf);
 383     break;
 384   default:
 385     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 386     CSP_ADDSTR(buf);
 387     break;
 388   }
 389   return adns_s_ok;
 390 }
 391
 392 static adns_status cs_addr(vbuf *vb, const void *datap) {
 393   const adns_rr_addr *rrp= datap;
 394
 395   return csp_addr(vb,rrp);
 396 }
 397
 398 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
 399   return type & adns__qtf_bigaddr ?
 400     sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
 401 }
 402
 403 /*
 404  * _domain      (pap,csp,cs)
 405  * _dom_raw     (pa)
 406  */
 407
 408 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 409                               char **domain_r, parsedomain_flags flags) {
 410   adns_status st;
 411   char *dm;
 412
 413   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 414                          pai->dgram,pai->dglen, cbyte_io, max);
 415   if (st) return st;
 416   if (!pai->qu->vb.used) return adns_s_invaliddata;
 417
 418   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 419   if (!dm) R_NOMEM;
 420
 421   dm[pai->qu->vb.used]= 0;
 422   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 423
 424   *domain_r= dm;
 425   return adns_s_ok;
 426 }
 427
 428 static adns_status csp_domain(vbuf *vb, const char *domain) {
 429   CSP_ADDSTR(domain);
 430   if (!*domain) CSP_ADDSTR(".");
 431   return adns_s_ok;
 432 }
 433
 434 static adns_status cs_domain(vbuf *vb, const void *datap) {
 435   const char *const *domainp= datap;
 436   return csp_domain(vb,*domainp);
 437 }
 438
 439 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
 440                               int max, void *datap) {
 441   char **rrp= datap;
 442   adns_status st;
 443
 444   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 445   if (st) return st;
 446
 447   if (cbyte != max) return adns_s_invaliddata;
 448   return adns_s_ok;
 449 }
 450
 451 /*
 452  * _host_raw   (pa)
 453  */
 454
 455 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
 456                                int max, void *datap) {
 457   char **rrp= datap;
 458   adns_status st;
 459
 460   st= pap_domain(pai, &cbyte, max, rrp,
 461                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 462   if (st) return st;
 463
 464   if (cbyte != max) return adns_s_invaliddata;
 465   return adns_s_ok;
 466 }
 467
 468 /*
 469  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
 470  */
 471
 472 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 473                                  size_t addrsz,
 474                                  int *cbyte_io, int count, int dmstart) {
 475   int rri, naddrs;
 476   int type, class, rdlen, rdstart, ownermatched;
 477   unsigned long ttl;
 478   adns_status st;
 479
 480   for (rri=0, naddrs=-1; rri<count; rri++) {
 481     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
 482                             pai->dglen, cbyte_io,
 483                             &type, &class, &ttl, &rdlen, &rdstart,
 484                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 485     if (st) return st;
 486     if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
 487       if (naddrs>0) break; else continue;
 488     }
 489     if (naddrs == -1) {
 490       naddrs= 0;
 491     }
 492     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
 493       R_NOMEM;
 494     adns__update_expires(pai->qu,ttl,pai->now);
 495     st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
 496     if (st) return st;
 497     naddrs++;
 498   }
 499   if (naddrs >= 0) {
 500     ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
 501     if (!ha->addrs) R_NOMEM;
 502     memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
 503     ha->naddrs= naddrs;
 504     ha->astatus= adns_s_ok;
 505
 506     adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
 507                 div_addr, pai->ads);
 508   }
 509   return adns_s_ok;
 510 }
 511
 512 static void icb_hostaddr(adns_query parent, adns_query child) {
 513   adns_answer *cans= child->answer;
 514   adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
 515   adns_state ads= parent->ads;
 516   adns_status st;
 517   size_t addrsz= gsz_addr(0, parent->answer->type);
 518
 519   st= cans->status;
 520   rrp->astatus= st;
 521   rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
 522   rrp->addrs= cans->rrs.addr;
 523   adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*addrsz);
 524
 525   if (parent->children.head) {
 526     LIST_LINK_TAIL(ads->childw,parent);
 527   } else {
 528     adns__query_done(parent);
 529   }
 530 }
 531
 532 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 533                                 int max, adns_rr_hostaddr *rrp) {
 534   adns_status st;
 535   int dmstart, cbyte;
 536   qcontext ctx;
 537   int id;
 538   adns_query nqu;
 539   adns_queryflags nflags;
 540   size_t addrsz= gsz_addr(0, pai->qu->answer->type);
 541
 542   dmstart= cbyte= *cbyte_io;
 543   st= pap_domain(pai, &cbyte, max, &rrp->host,
 544                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 545   if (st) return st;
 546   *cbyte_io= cbyte;
 547
 548   rrp->astatus= adns_s_ok;
 549   rrp->naddrs= -1;
 550   rrp->addrs= 0;
 551
 552   cbyte= pai->nsstart;
 553
 554   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
 555   if (st) return st;
 556   if (rrp->naddrs != -1) return adns_s_ok;
 557
 558   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
 559   if (st) return st;
 560   if (rrp->naddrs != -1) return adns_s_ok;
 561
 562   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 563                             pai->dgram, pai->dglen, dmstart,
 564                             adns_r_addr, adns_qf_quoteok_query);
 565   if (st) return st;
 566
 567   ctx.ext= 0;
 568   ctx.callback= icb_hostaddr;
 569   ctx.pinfo.hostaddr= rrp;
 570   memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
 571
 572   nflags= adns_qf_quoteok_query;
 573   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 574
 575   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 576                             ((adns_r_addr & adns_rrt_reprmask) |
 577                              (pai->qu->answer->type & ~adns_rrt_reprmask)),
 578                             &pai->qu->vb, id, nflags, pai->now, &ctx);
 579   if (st) return st;
 580
 581   nqu->parent= pai->qu;
 582   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 583
 584   return adns_s_ok;
 585 }
 586
 587 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
 588                                int max, void *datap) {
 589   adns_rr_hostaddr *rrp= datap;
 590   adns_status st;
 591
 592   st= pap_hostaddr(pai, &cbyte, max, rrp);
 593   if (st) return st;
 594   if (cbyte != max) return adns_s_invaliddata;
 595
 596   return adns_s_ok;
 597 }
 598
 599 static int dip_hostaddr(adns_state ads,
 600                         const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 601   if (ap->astatus != bp->astatus) return ap->astatus;
 602   if (ap->astatus) return 0;
 603
 604   return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
 605 }
 606
 607 static int di_hostaddr(adns_state ads,
 608                        const void *datap_a, const void *datap_b) {
 609   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 610
 611   return dip_hostaddr(ads, ap,bp);
 612 }
 613
 614 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 615   void *tablev;
 616   size_t addrsz= gsz_addr(0, qu->answer->type);
 617
 618   adns__makefinal_str(qu,&rrp->host);
 619   tablev= rrp->addrs;
 620   adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
 621   rrp->addrs= tablev;
 622 }
 623
 624 static void mf_hostaddr(adns_query qu, void *datap) {
 625   adns_rr_hostaddr *rrp= datap;
 626
 627   mfp_hostaddr(qu,rrp);
 628 }
 629
 630 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 631   const char *errstr;
 632   adns_status st;
 633   char buf[20];
 634   int i;
 635
 636   st= csp_domain(vb,rrp->host);  if (st) return st;
 637
 638   CSP_ADDSTR(" ");
 639   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 640
 641   sprintf(buf," %d ",rrp->astatus);
 642   CSP_ADDSTR(buf);
 643
 644   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 645   CSP_ADDSTR(" ");
 646
 647   errstr= adns_strerror(rrp->astatus);
 648   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 649
 650   if (rrp->naddrs >= 0) {
 651     CSP_ADDSTR(" (");
 652     for (i=0; i<rrp->naddrs; i++) {
 653       CSP_ADDSTR(" ");
 654       st= csp_addr(vb,&rrp->addrs[i]);
 655     }
 656     CSP_ADDSTR(" )");
 657   } else {
 658     CSP_ADDSTR(" ?");
 659   }
 660   return adns_s_ok;
 661 }
 662
 663 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 664   const adns_rr_hostaddr *rrp= datap;
 665
 666   return csp_hostaddr(vb,rrp);
 667 }
 668
 669 /*
 670  * _mx_raw   (pa,di)
 671  */
 672
 673 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
 674                              int max, void *datap) {
 675   const byte *dgram= pai->dgram;
 676   adns_rr_intstr *rrp= datap;
 677   adns_status st;
 678   int pref;
 679
 680   if (cbyte+2 > max) return adns_s_invaliddata;
 681   GET_W(cbyte,pref);
 682   rrp->i= pref;
 683   st= pap_domain(pai, &cbyte, max, &rrp->str,
 684                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 685   if (st) return st;
 686
 687   if (cbyte != max) return adns_s_invaliddata;
 688   return adns_s_ok;
 689 }
 690
 691 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 692   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 693
 694   if (ap->i < bp->i) return 0;
 695   if (ap->i > bp->i) return 1;
 696   return 0;
 697 }
 698
 699 /*
 700  * _mx   (pa,di)
 701  */
 702
 703 static adns_status pa_mx(const parseinfo *pai, int cbyte,
 704                          int max, void *datap) {
 705   const byte *dgram= pai->dgram;
 706   adns_rr_inthostaddr *rrp= datap;
 707   adns_status st;
 708   int pref;
 709
 710   if (cbyte+2 > max) return adns_s_invaliddata;
 711   GET_W(cbyte,pref);
 712   rrp->i= pref;
 713   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 714   if (st) return st;
 715
 716   if (cbyte != max) return adns_s_invaliddata;
 717   return adns_s_ok;
 718 }
 719
 720 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
 721   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
 722
 723   if (ap->i < bp->i) return 0;
 724   if (ap->i > bp->i) return 1;
 725   return dip_hostaddr(ads, &ap->ha, &bp->ha);
 726 }
 727
 728 /*
 729  * _inthostaddr  (mf,cs)
 730  */
 731
 732 static void mf_inthostaddr(adns_query qu, void *datap) {
 733   adns_rr_inthostaddr *rrp= datap;
 734
 735   mfp_hostaddr(qu,&rrp->ha);
 736 }
 737
 738 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
 739   const adns_rr_inthostaddr *rrp= datap;
 740   char buf[10];
 741
 742   sprintf(buf,"%u ",rrp->i);
 743   CSP_ADDSTR(buf);
 744
 745   return csp_hostaddr(vb,&rrp->ha);
 746 }
 747
 748 /*
 749  * _inthost  (cs)
 750  */
 751
 752 static adns_status cs_inthost(vbuf *vb, const void *datap) {
 753   const adns_rr_intstr *rrp= datap;
 754   char buf[10];
 755
 756   sprintf(buf,"%u ",rrp->i);
 757   CSP_ADDSTR(buf);
 758   return csp_domain(vb,rrp->str);
 759 }
 760
 761 /*
 762  * _ptr   (ckl,pa +icb_ptr)
 763  */
 764
 765 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
 766                            union checklabel_state *cls, qcontext *ctx,
 767                            int labnum, const char *label, int lablen) {
 768   static const char *const (expectdomain[])= { DNS_INADDR_ARPA };
 769   char *ep;
 770   const char *ed;
 771   char labbuf[4];
 772   int l;
 773
 774   if (labnum < 4) {
 775     if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
 776     memcpy(labbuf, label, lablen);
 777     labbuf[lablen]= 0;
 778     cls->ptr.ipv[3-labnum]= strtoul(labbuf,&ep,10);
 779     if (*ep) return adns_s_querydomainwrong;
 780     if (lablen>1 && *label=='0') return adns_s_querydomainwrong;
 781   } else if (labnum < 4 + sizeof(expectdomain)/sizeof(*expectdomain)) {
 782     ed= expectdomain[labnum-4];
 783     l= strlen(ed);
 784     if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong;
 785   } else {
 786     if (lablen) return adns_s_querydomainwrong;
 787     ctx->tinfo.ptr.addr.af= AF_INET;
 788     ctx->tinfo.ptr.addr.addr.v4.s_addr=
 789       htonl((cls->ptr.ipv[0]<<24) | (cls->ptr.ipv[1]<<16) |
 790             (cls->ptr.ipv[2]<< 8) | (cls->ptr.ipv[3]));
 791   }
 792   return adns_s_ok;
 793 }
 794
 795 static void icb_ptr(adns_query parent, adns_query child) {
 796   adns_answer *cans= child->answer;
 797   const struct af_addr *queried;
 798   const unsigned char *found;
 799   adns_state ads= parent->ads;
 800   int i;
 801
 802   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
 803     adns__query_fail(parent,adns_s_inconsistent);
 804     return;
 805   } else if (cans->status) {
 806     adns__query_fail(parent,cans->status);
 807     return;
 808   }
 809
 810   queried= &parent->ctx.tinfo.ptr.addr;
 811   assert(cans->type == adns_r_a);
 812   for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
 813     if (adns__genaddr_equal_p(queried->af,&queried->addr, AF_INET,found)) {
 814       if (!parent->children.head) {
 815         adns__query_done(parent);
 816         return;
 817       } else {
 818         LIST_LINK_TAIL(ads->childw,parent);
 819         return;
 820       }
 821     }
 822   }
 823
 824   adns__query_fail(parent,adns_s_inconsistent);
 825 }
 826
 827 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
 828                           int max, void *datap) {
 829   char **rrp= datap;
 830   adns_status st;
 831   int cbyte, id;
 832   adns_query nqu;
 833   qcontext ctx;
 834
 835   cbyte= dmstart;
 836   st= pap_domain(pai, &cbyte, max, rrp,
 837                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 838   if (st) return st;
 839   if (cbyte != max) return adns_s_invaliddata;
 840
 841   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 842                             pai->dgram, pai->dglen, dmstart,
 843                             adns_r_a, adns_qf_quoteok_query);
 844   if (st) return st;
 845
 846   ctx.ext= 0;
 847   ctx.callback= icb_ptr;
 848   memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
 849   memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
 850   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_a),
 851                             adns_r_a, &pai->qu->vb, id, adns_qf_quoteok_query,
 852                             pai->now, &ctx);
 853   if (st) return st;
 854
 855   nqu->parent= pai->qu;
 856   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 857   return adns_s_ok;
 858 }
 859
 860 /*
 861  * _strpair   (mf)
 862  */
 863
 864 static void mf_strpair(adns_query qu, void *datap) {
 865   adns_rr_strpair *rrp= datap;
 866
 867   adns__makefinal_str(qu,&rrp->array[0]);
 868   adns__makefinal_str(qu,&rrp->array[1]);
 869 }
 870
 871 /*
 872  * _intstrpair   (mf)
 873  */
 874
 875 static void mf_intstrpair(adns_query qu, void *datap) {
 876   adns_rr_intstrpair *rrp= datap;
 877
 878   adns__makefinal_str(qu,&rrp->array[0].str);
 879   adns__makefinal_str(qu,&rrp->array[1].str);
 880 }
 881
 882 /*
 883  * _hinfo   (pa)
 884  */
 885
 886 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
 887                             int max, void *datap) {
 888   adns_rr_intstrpair *rrp= datap;
 889   adns_status st;
 890   int i;
 891
 892   for (i=0; i<2; i++) {
 893     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
 894     if (st) return st;
 895   }
 896
 897   if (cbyte != max) return adns_s_invaliddata;
 898
 899   return adns_s_ok;
 900 }
 901
 902 /*
 903  * _mailbox   (pap,cs +pap_mailbox822)
 904  */
 905
 906 static adns_status pap_mailbox822(const parseinfo *pai,
 907                                   int *cbyte_io, int max, char **mb_r) {
 908   int lablen, labstart, i, needquote, c, r, neednorm;
 909   const unsigned char *p;
 910   char *str;
 911   findlabel_state fls;
 912   adns_status st;
 913   vbuf *vb;
 914
 915   vb= &pai->qu->vb;
 916   vb->used= 0;
 917   adns__findlabel_start(&fls, pai->ads,
 918                         -1, pai->qu,
 919                         pai->dgram, pai->dglen, max,
 920                         *cbyte_io, cbyte_io);
 921   st= adns__findlabel_next(&fls,&lablen,&labstart);
 922   if (!lablen) {
 923     adns__vbuf_appendstr(vb,".");
 924     goto x_ok;
 925   }
 926
 927   neednorm= 1;
 928   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
 929     c= *p++;
 930     if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
 931     if (c == '.' && !neednorm) neednorm= 1;
 932     else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
 933     else neednorm= 0;
 934   }
 935
 936   if (needquote || neednorm) {
 937     r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
 938     adns__vbuf_appendq(vb,"\"",1);
 939     for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
 940       c= *p;
 941       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
 942       adns__vbuf_appendq(vb,p,1);
 943     }
 944     adns__vbuf_appendq(vb,"\"",1);
 945   } else {
 946     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
 947   }
 948
 949   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
 950
 951   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
 952   if (st) return st;
 953
 954  x_ok:
 955   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
 956   memcpy(str,vb->buf,vb->used);
 957   str[vb->used]= 0;
 958   *mb_r= str;
 959   return adns_s_ok;
 960 }
 961
 962 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
 963                                char **mb_r) {
 964   if (pai->qu->typei->typekey & adns__qtf_mail822) {
 965     return pap_mailbox822(pai, cbyte_io, max, mb_r);
 966   } else {
 967     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
 968   }
 969 }
 970
 971 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
 972   return csp_domain(vb,mailbox);
 973 }
 974
 975 /*
 976  * _rp   (pa,cs)
 977  */
 978
 979 static adns_status pa_rp(const parseinfo *pai, int cbyte,
 980                          int max, void *datap) {
 981   adns_rr_strpair *rrp= datap;
 982   adns_status st;
 983
 984   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
 985   if (st) return st;
 986
 987   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
 988   if (st) return st;
 989
 990   if (cbyte != max) return adns_s_invaliddata;
 991   return adns_s_ok;
 992 }
 993
 994 static adns_status cs_rp(vbuf *vb, const void *datap) {
 995   const adns_rr_strpair *rrp= datap;
 996   adns_status st;
 997
 998   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
 999   CSP_ADDSTR(" ");
1000   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
1001
1002   return adns_s_ok;
1003 }
1004
1005 /*
1006  * _soa   (pa,mf,cs)
1007  */
1008
1009 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1010                           int max, void *datap) {
1011   adns_rr_soa *rrp= datap;
1012   const byte *dgram= pai->dgram;
1013   adns_status st;
1014   int msw, lsw, i;
1015
1016   st= pap_domain(pai, &cbyte, max, &rrp->mname,
1017                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1018   if (st) return st;
1019
1020   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1021   if (st) return st;
1022
1023   if (cbyte+20 != max) return adns_s_invaliddata;
1024
1025   for (i=0; i<5; i++) {
1026     GET_W(cbyte,msw);
1027     GET_W(cbyte,lsw);
1028     (&rrp->serial)[i]= (msw<<16) | lsw;
1029   }
1030
1031   return adns_s_ok;
1032 }
1033
1034 static void mf_soa(adns_query qu, void *datap) {
1035   adns_rr_soa *rrp= datap;
1036
1037   adns__makefinal_str(qu,&rrp->mname);
1038   adns__makefinal_str(qu,&rrp->rname);
1039 }
1040
1041 static adns_status cs_soa(vbuf *vb, const void *datap) {
1042   const adns_rr_soa *rrp= datap;
1043   char buf[20];
1044   int i;
1045   adns_status st;
1046
1047   st= csp_domain(vb,rrp->mname);  if (st) return st;
1048   CSP_ADDSTR(" ");
1049   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
1050
1051   for (i=0; i<5; i++) {
1052     sprintf(buf," %lu",(&rrp->serial)[i]);
1053     CSP_ADDSTR(buf);
1054   }
1055
1056   return adns_s_ok;
1057 }
1058
1059 /*
1060  * _srv*  (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1061  */
1062
1063 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1064                            union checklabel_state *cls, qcontext *ctx,
1065                            int labnum, const char *label, int lablen) {
1066   if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1067     if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1068     return adns_s_ok;
1069   }
1070   return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1071 }
1072
1073 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1074                                  adns_rr_srvha *rrp
1075                                    /* might be adns_rr_srvraw* */) {
1076   const byte *dgram= pai->dgram;
1077   int ti, cbyte;
1078
1079   cbyte= *cbyte_io;
1080   if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1081
1082   rrp->priority= GET_W(cbyte, ti);
1083   rrp->weight=   GET_W(cbyte, ti);
1084   rrp->port=     GET_W(cbyte, ti);
1085   return adns_s_ok;
1086 }
1087
1088 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1089                              int max, void *datap) {
1090   adns_rr_srvraw *rrp= datap;
1091   adns_status st;
1092
1093   st= pap_srv_begin(pai,&cbyte,max,datap);
1094   if (st) return st;
1095
1096   st= pap_domain(pai, &cbyte, max, &rrp->host,
1097                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1098   if (st) return st;
1099
1100   if (cbyte != max) return adns_s_invaliddata;
1101   return adns_s_ok;
1102 }
1103
1104 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1105                             int max, void *datap) {
1106   adns_rr_srvha *rrp= datap;
1107   adns_status st;
1108
1109   st= pap_srv_begin(pai,&cbyte,max,datap);       if (st) return st;
1110   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);  if (st) return st;
1111   if (cbyte != max) return adns_s_invaliddata;
1112   return adns_s_ok;
1113 }
1114
1115 static void mf_srvraw(adns_query qu, void *datap) {
1116   adns_rr_srvraw *rrp= datap;
1117   adns__makefinal_str(qu, &rrp->host);
1118 }
1119
1120 static void mf_srvha(adns_query qu, void *datap) {
1121   adns_rr_srvha *rrp= datap;
1122   mfp_hostaddr(qu,&rrp->ha);
1123 }
1124
1125 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1126   const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1127     /* might be const adns_rr_svhostaddr* */
1128
1129   if (ap->priority < bp->priority) return 0;
1130   if (ap->priority > bp->priority) return 1;
1131   return 0;
1132 }
1133
1134 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1135                                    /* might be adns_rr_srvraw* */) {
1136   char buf[30];
1137   sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1138   CSP_ADDSTR(buf);
1139   return adns_s_ok;
1140 }
1141
1142 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1143   const adns_rr_srvraw *rrp= datap;
1144   adns_status st;
1145
1146   st= csp_srv_begin(vb,(const void*)rrp);  if (st) return st;
1147   return csp_domain(vb,rrp->host);
1148 }
1149
1150 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1151   const adns_rr_srvha *rrp= datap;
1152   adns_status st;
1153
1154   st= csp_srv_begin(vb,(const void*)datap);  if (st) return st;
1155   return csp_hostaddr(vb,&rrp->ha);
1156 }
1157
1158 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1159                          const struct typeinfo *typei) {
1160   /* we treat everything in the array as if it were an adns_rr_srvha
1161    * even though the array might be of adns_rr_srvraw.  That's OK
1162    * because they have the same prefix, which is all we access.
1163    * We use rrsz, too, rather than naive array indexing, of course.
1164    */
1165   char *workbegin, *workend, *search, *arrayend;
1166   const adns_rr_srvha *rr;
1167   union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1168   int cpriority, totalweight, runtotal;
1169   long randval;
1170
1171   assert(rrsz <= sizeof(rrtmp));
1172   for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1173        workbegin < arrayend;
1174        workbegin= workend) {
1175     cpriority= (rr=(void*)workbegin)->priority;
1176
1177     for (workend= workbegin, totalweight= 0;
1178          workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1179          workend += rrsz) {
1180       totalweight += rr->weight;
1181     }
1182
1183     /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1184      * cpriority.  From now on, workbegin points to the `remaining'
1185      * records: we select one record at a time (RFC2782 `Usage rules'
1186      * and `Format of the SRV RR' subsection `Weight') to place at
1187      * workbegin (swapping with the one that was there, and then
1188      * advance workbegin. */
1189     for (;
1190          workbegin + rrsz < workend; /* don't bother if just one */
1191          workbegin += rrsz) {
1192
1193       randval= nrand48(ads->rand48xsubi);
1194       randval %= (totalweight + 1);
1195         /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1196          * totalweight must be <= 2^26 so probability nonuniformity is
1197          * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1198          *  abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1199          */
1200
1201       for (search=workbegin, runtotal=0;
1202            (runtotal += (rr=(void*)search)->weight) < randval;
1203            search += rrsz);
1204       assert(search < arrayend);
1205       totalweight -= rr->weight;
1206       if (search != workbegin) {
1207         memcpy(&rrtmp, workbegin, rrsz);
1208         memcpy(workbegin, search, rrsz);
1209         memcpy(search, &rrtmp, rrsz);
1210       }
1211     }
1212   }
1213   /* tests:
1214    *  dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1215    *   ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1216    *   ./adnshost_s -t srv- _jabber._tcp.jabber.org
1217    */
1218 }
1219
1220 /*
1221  * _byteblock   (mf)
1222  */
1223
1224 static void mf_byteblock(adns_query qu, void *datap) {
1225   adns_rr_byteblock *rrp= datap;
1226   void *bytes= rrp->data;
1227   adns__makefinal_block(qu,&bytes,rrp->len);
1228   rrp->data= bytes;
1229 }
1230
1231 /*
1232  * _opaque   (pa,cs)
1233  */
1234
1235 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1236                              int max, void *datap) {
1237   adns_rr_byteblock *rrp= datap;
1238
1239   rrp->len= max - cbyte;
1240   rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1241   if (!rrp->data) R_NOMEM;
1242   memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1243   return adns_s_ok;
1244 }
1245
1246 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1247   const adns_rr_byteblock *rrp= datap;
1248   char buf[10];
1249   int l;
1250   unsigned char *p;
1251
1252   sprintf(buf,"\\# %d",rrp->len);
1253   CSP_ADDSTR(buf);
1254
1255   for (l= rrp->len, p= rrp->data;
1256        l>=4;
1257        l -= 4, p += 4) {
1258     sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1259     CSP_ADDSTR(buf);
1260   }
1261   for (;
1262        l>0;
1263        l--, p++) {
1264     sprintf(buf," %02x",*p);
1265     CSP_ADDSTR(buf);
1266   }
1267   return adns_s_ok;
1268 }
1269
1270 /*
1271  * _flat   (mf)
1272  */
1273
1274 static void mf_flat(adns_query qu, void *data) { }
1275
1276 /*
1277  * Now the table.
1278  */
1279
1280 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
1281
1282 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1283  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb,  \
1284      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1285      adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1286 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1287  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat,    \
1288      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1289      adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) }
1290
1291 #define di_0 0
1292
1293 static const typeinfo typeinfos[] = {
1294 /* Must be in ascending order of rrtype ! */
1295 /* mem-mgmt code  rrt     fmt   member   parser      comparer  printer */
1296
1297 FLAT_TYPE(a,      "A",     0,   inaddr,    inaddr,  inaddr,inaddr          ),
1298 DEEP_TYPE(ns_raw, "NS",   "raw",str,       host_raw,0,     domain          ),
1299 DEEP_TYPE(cname,  "CNAME", 0,   str,       dom_raw, 0,     domain          ),
1300 DEEP_TYPE(soa_raw,"SOA",  "raw",soa,       soa,     0,     soa             ),
1301 DEEP_TYPE(ptr_raw,"PTR",  "raw",str,       host_raw,0,     domain          ),
1302 DEEP_TYPE(hinfo,  "HINFO", 0,   intstrpair,hinfo,   0,     hinfo           ),
1303 DEEP_TYPE(mx_raw, "MX",   "raw",intstr,    mx_raw,  mx_raw,inthost         ),
1304 DEEP_TYPE(txt,    "TXT",   0,   manyistr,  txt,     0,     txt             ),
1305 DEEP_TYPE(rp_raw, "RP",   "raw",strpair,   rp,      0,     rp              ),
1306 FLAT_TYPE(aaaa,   "AAAA",  0,   in6addr,   in6addr, in6addr,in6addr        ),
1307 DEEP_TYPE(srv_raw,"SRV",  "raw",srvraw ,   srvraw,  srv,   srvraw,
1308                               .checklabel= ckl_srv, .postsort= postsort_srv),
1309
1310 FLAT_TYPE(addr,   "A",  "addr", addr,      addr,    addr,  addr,
1311                                                          .getrrsz= gsz_addr),
1312 DEEP_TYPE(ns,     "NS", "+addr",hostaddr,  hostaddr,hostaddr,hostaddr      ),
1313 DEEP_TYPE(ptr,    "PTR","checked",str,     ptr,     0,     domain,
1314                                                        .checklabel= ckl_ptr),
1315 DEEP_TYPE(mx,     "MX", "+addr",inthostaddr,mx,     mx,    inthostaddr,    ),
1316 DEEP_TYPE(srv,    "SRV","+addr",srvha,     srvha,   srv,   srvha,
1317                               .checklabel= ckl_srv, .postsort= postsort_srv),
1318
1319 DEEP_TYPE(soa,    "SOA","822",  soa,       soa,     0,     soa             ),
1320 DEEP_TYPE(rp,     "RP", "822",  strpair,   rp,      0,     rp              ),
1321 };
1322
1323 static const typeinfo typeinfo_unknown=
1324 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque,  0,     opaque            );
1325
1326 const typeinfo *adns__findtype(adns_rrtype type) {
1327   const typeinfo *begin, *end, *mid;
1328
1329   if (type & adns_r_unknown) return &typeinfo_unknown;
1330   type &= adns_rrt_reprmask;
1331
1332   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1333
1334   while (begin < end) {
1335     mid= begin + ((end-begin)>>1);
1336     if (mid->typekey == type) return mid;
1337     if (type > mid->typekey) begin= mid+1;
1338     else end= mid;
1339   }
1340   return 0;
1341 }