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 +search_sortlist, dip_genaddr)
  51  * _addr                      (pa,di,div,csp,cs,gsz
  52  *                              +search_sortlist_sa, dip_sockaddr)
  53  * _domain                    (pap,csp,cs)
  54  * _dom_raw                   (pa)
  55  * _host_raw                  (pa)
  56  * _hostaddr                  (pap,pa,dip,di,mfp,mf,csp,cs
  57  *                              +pap_findaddrs, icb_hostaddr)
  58  * _mx_raw                    (pa,di)
  59  * _mx                        (pa,di)
  60  * _inthostaddr               (mf,cs)
  61  * _inthost                   (cs)
  62  * _ptr                       (ckl,pa +icb_ptr)
  63  * _strpair                   (mf)
  64  * _intstrpair                (mf)
  65  * _hinfo                     (pa)
  66  * _mailbox                   (pap,csp +pap_mailbox822)
  67  * _rp                        (pa,cs)
  68  * _soa                       (pa,mf,cs)
  69  * _srv*                      (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
  70  * _byteblock                 (mf)
  71  * _opaque                    (pa,cs)
  72  * _flat                      (mf)
  73  *
  74  * within each section:
  75  *    ckl_*
  76  *    pap_*
  77  *    pa_*
  78  *    dip_*
  79  *    di_*
  80  *    mfp_*
  81  *    mf_*
  82  *    csp_*
  83  *    cs_*
  84  *    gsz_*
  85  *    postsort_*
  86  */
  87
  88 /*
  89  * _qstring               (pap,csp)
  90  */
  91
  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;
  96    */
  97   const byte *dgram= pai->dgram;
  98   int l, cbyte;
  99   char *str;
 100
 101   cbyte= *cbyte_io;
 102
 103   if (cbyte >= max) return adns_s_invaliddata;
 104   GET_B(cbyte,l);
 105   if (cbyte+l > max) return adns_s_invaliddata;
 106
 107   str= adns__alloc_interim(pai->qu, l+1);
 108   if (!str) R_NOMEM;
 109
 110   str[l]= 0;
 111   memcpy(str,dgram+cbyte,l);
 112
 113   *len_r= l;
 114   *str_r= str;
 115   *cbyte_io= cbyte+l;
 116
 117   return adns_s_ok;
 118 }
 119
 120 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
 121   unsigned char ch;
 122   char buf[10];
 123   int cn;
 124
 125   CSP_ADDSTR("\"");
 126   for (cn=0; cn<len; cn++) {
 127     ch= *dp++;
 128     if (ch == '\\') {
 129       CSP_ADDSTR("\\\\");
 130     } else if (ch == '"') {
 131       CSP_ADDSTR("\\\"");
 132     } else if (ch >= 32 && ch <= 126) {
 133       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 134     } else {
 135       sprintf(buf,"\\x%02x",ch);
 136       CSP_ADDSTR(buf);
 137     }
 138   }
 139   CSP_ADDSTR("\"");
 140
 141   return adns_s_ok;
 142 }
 143
 144 /*
 145  * _str  (mf)
 146  */
 147
 148 static void mf_str(adns_query qu, void *datap) {
 149   char **rrp= datap;
 150
 151   adns__makefinal_str(qu,rrp);
 152 }
 153
 154 /*
 155  * _intstr  (mf)
 156  */
 157
 158 static void mf_intstr(adns_query qu, void *datap) {
 159   adns_rr_intstr *rrp= datap;
 160
 161   adns__makefinal_str(qu,&rrp->str);
 162 }
 163
 164 /*
 165  * _manyistr   (mf)
 166  */
 167
 168 static void mf_manyistr(adns_query qu, void *datap) {
 169   adns_rr_intstr **rrp= datap;
 170   adns_rr_intstr *te, *table;
 171   void *tablev;
 172   int tc;
 173
 174   for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
 175   tablev= *rrp;
 176   adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
 177   *rrp= table= tablev;
 178   for (te= *rrp; te->i >= 0; te++)
 179     adns__makefinal_str(qu,&te->str);
 180 }
 181
 182 /*
 183  * _txt   (pa,cs)
 184  */
 185
 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;
 191   adns_status st;
 192
 193   startbyte= cbyte;
 194   if (cbyte >= max) return adns_s_invaliddata;
 195   tc= 0;
 196   while (cbyte < max) {
 197     GET_B(cbyte,l);
 198     cbyte+= l;
 199     tc++;
 200   }
 201   if (cbyte != max || !tc) return adns_s_invaliddata;
 202
 203   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 204   if (!table) R_NOMEM;
 205
 206   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 207     st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
 208     if (st) return st;
 209   }
 210   assert(cbyte == max);
 211
 212   te->i= -1;
 213   te->str= 0;
 214
 215   *rrp= table;
 216   return adns_s_ok;
 217 }
 218
 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;
 222   adns_status st;
 223   int spc;
 224
 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;
 228   }
 229   return adns_s_ok;
 230 }
 231
 232 /*
 233  * _hinfo   (cs)
 234  */
 235
 236 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
 237   const adns_rr_intstrpair *rrp= datap;
 238   adns_status st;
 239
 240   st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i);  if (st) return st;
 241   CSP_ADDSTR(" ");
 242   st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i);  if (st) return st;
 243   return adns_s_ok;
 244 }
 245
 246 /*
 247  * _inaddr   (pa,di,cs +search_sortlist, dip_genaddr)
 248  */
 249
 250 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
 251                              int max, void *datap) {
 252   struct in_addr *storeto= datap;
 253
 254   if (max-cbyte != 4) return adns_s_invaliddata;
 255   memcpy(storeto, pai->dgram + cbyte, 4);
 256   return adns_s_ok;
 257 }
 258
 259 static int search_sortlist(adns_state ads, int af, const void *ad) {
 260   const struct sortlist *slp;
 261   const struct in_addr *a4;
 262   int i;
 263
 264   assert(af==AF_INET);
 265   a4= ad;
 266   for (i=0, slp=ads->sortlist;
 267        i<ads->nsortlist &&
 268          (assert(slp->af==AF_INET),
 269           !((a4->s_addr & slp->mask.v4.s_addr) == slp->base.v4.s_addr));
 270        i++, slp++);
 271   return i;
 272 }
 273
 274 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
 275   int ai, bi;
 276
 277   if (!ads->nsortlist) return 0;
 278
 279   ai= search_sortlist(ads,af,a);
 280   bi= search_sortlist(ads,af,b);
 281   return bi<ai;
 282 }
 283
 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);
 287 }
 288
 289 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 290   const struct in_addr *rrp= datap, rr= *rrp;
 291   const char *ia;
 292
 293   ia= inet_ntoa(rr); assert(ia);
 294   CSP_ADDSTR(ia);
 295   return adns_s_ok;
 296 }
 297
 298 /*
 299  * _addr   (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr)
 300  */
 301
 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;
 306
 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);
 312   return adns_s_ok;
 313 }
 314
 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);
 319 }
 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);
 325 }
 326
 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);
 330 }
 331
 332 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 333   const adns_state ads= context;
 334
 335   return di_addr(ads, datap_a, datap_b);
 336 }
 337
 338 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 339   const char *ia;
 340   char buf[30];
 341
 342   switch (rrp->addr.inet.sin_family) {
 343   case AF_INET:
 344     CSP_ADDSTR("INET ");
 345     ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
 346     CSP_ADDSTR(ia);
 347     break;
 348   default:
 349     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 350     CSP_ADDSTR(buf);
 351     break;
 352   }
 353   return adns_s_ok;
 354 }
 355
 356 static adns_status cs_addr(vbuf *vb, const void *datap) {
 357   const adns_rr_addr *rrp= datap;
 358
 359   return csp_addr(vb,rrp);
 360 }
 361
 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);
 365 }
 366
 367 /*
 368  * _domain      (pap,csp,cs)
 369  * _dom_raw     (pa)
 370  */
 371
 372 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 373                               char **domain_r, parsedomain_flags flags) {
 374   adns_status st;
 375   char *dm;
 376
 377   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 378                          pai->dgram,pai->dglen, cbyte_io, max);
 379   if (st) return st;
 380   if (!pai->qu->vb.used) return adns_s_invaliddata;
 381
 382   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 383   if (!dm) R_NOMEM;
 384
 385   dm[pai->qu->vb.used]= 0;
 386   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 387
 388   *domain_r= dm;
 389   return adns_s_ok;
 390 }
 391
 392 static adns_status csp_domain(vbuf *vb, const char *domain) {
 393   CSP_ADDSTR(domain);
 394   if (!*domain) CSP_ADDSTR(".");
 395   return adns_s_ok;
 396 }
 397
 398 static adns_status cs_domain(vbuf *vb, const void *datap) {
 399   const char *const *domainp= datap;
 400   return csp_domain(vb,*domainp);
 401 }
 402
 403 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
 404                               int max, void *datap) {
 405   char **rrp= datap;
 406   adns_status st;
 407
 408   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 409   if (st) return st;
 410
 411   if (cbyte != max) return adns_s_invaliddata;
 412   return adns_s_ok;
 413 }
 414
 415 /*
 416  * _host_raw   (pa)
 417  */
 418
 419 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
 420                                int max, void *datap) {
 421   char **rrp= datap;
 422   adns_status st;
 423
 424   st= pap_domain(pai, &cbyte, max, rrp,
 425                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 426   if (st) return st;
 427
 428   if (cbyte != max) return adns_s_invaliddata;
 429   return adns_s_ok;
 430 }
 431
 432 /*
 433  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
 434  */
 435
 436 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 437                                  size_t addrsz,
 438                                  int *cbyte_io, int count, int dmstart) {
 439   int rri, naddrs;
 440   int type, class, rdlen, rdstart, ownermatched;
 441   unsigned long ttl;
 442   adns_status st;
 443
 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);
 449     if (st) return st;
 450     if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
 451       if (naddrs>0) break; else continue;
 452     }
 453     if (naddrs == -1) {
 454       naddrs= 0;
 455     }
 456     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
 457       R_NOMEM;
 458     adns__update_expires(pai->qu,ttl,pai->now);
 459     st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
 460     if (st) return st;
 461     naddrs++;
 462   }
 463   if (naddrs >= 0) {
 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);
 467     ha->naddrs= naddrs;
 468     ha->astatus= adns_s_ok;
 469
 470     adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
 471                 div_addr, pai->ads);
 472   }
 473   return adns_s_ok;
 474 }
 475
 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;
 480   adns_status st;
 481   size_t addrsz= gsz_addr(0, parent->answer->type);
 482
 483   st= cans->status;
 484   rrp->astatus= st;
 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);
 488
 489   if (parent->children.head) {
 490     LIST_LINK_TAIL(ads->childw,parent);
 491   } else {
 492     adns__query_done(parent);
 493   }
 494 }
 495
 496 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 497                                 int max, adns_rr_hostaddr *rrp) {
 498   adns_status st;
 499   int dmstart, cbyte;
 500   qcontext ctx;
 501   int id;
 502   adns_query nqu;
 503   adns_queryflags nflags;
 504   size_t addrsz= gsz_addr(0, pai->qu->answer->type);
 505
 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);
 509   if (st) return st;
 510   *cbyte_io= cbyte;
 511
 512   rrp->astatus= adns_s_ok;
 513   rrp->naddrs= -1;
 514   rrp->addrs= 0;
 515
 516   cbyte= pai->nsstart;
 517
 518   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
 519   if (st) return st;
 520   if (rrp->naddrs != -1) return adns_s_ok;
 521
 522   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
 523   if (st) return st;
 524   if (rrp->naddrs != -1) return adns_s_ok;
 525
 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);
 529   if (st) return st;
 530
 531   ctx.ext= 0;
 532   ctx.callback= icb_hostaddr;
 533   ctx.pinfo.hostaddr= rrp;
 534   memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
 535
 536   nflags= adns_qf_quoteok_query;
 537   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 538
 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);
 543   if (st) return st;
 544
 545   nqu->parent= pai->qu;
 546   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 547
 548   return adns_s_ok;
 549 }
 550
 551 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
 552                                int max, void *datap) {
 553   adns_rr_hostaddr *rrp= datap;
 554   adns_status st;
 555
 556   st= pap_hostaddr(pai, &cbyte, max, rrp);
 557   if (st) return st;
 558   if (cbyte != max) return adns_s_invaliddata;
 559
 560   return adns_s_ok;
 561 }
 562
 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;
 567
 568   return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
 569 }
 570
 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;
 574
 575   return dip_hostaddr(ads, ap,bp);
 576 }
 577
 578 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 579   void *tablev;
 580   size_t addrsz= gsz_addr(0, qu->answer->type);
 581
 582   adns__makefinal_str(qu,&rrp->host);
 583   tablev= rrp->addrs;
 584   adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
 585   rrp->addrs= tablev;
 586 }
 587
 588 static void mf_hostaddr(adns_query qu, void *datap) {
 589   adns_rr_hostaddr *rrp= datap;
 590
 591   mfp_hostaddr(qu,rrp);
 592 }
 593
 594 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 595   const char *errstr;
 596   adns_status st;
 597   char buf[20];
 598   int i;
 599
 600   st= csp_domain(vb,rrp->host);  if (st) return st;
 601
 602   CSP_ADDSTR(" ");
 603   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 604
 605   sprintf(buf," %d ",rrp->astatus);
 606   CSP_ADDSTR(buf);
 607
 608   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 609   CSP_ADDSTR(" ");
 610
 611   errstr= adns_strerror(rrp->astatus);
 612   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 613
 614   if (rrp->naddrs >= 0) {
 615     CSP_ADDSTR(" (");
 616     for (i=0; i<rrp->naddrs; i++) {
 617       CSP_ADDSTR(" ");
 618       st= csp_addr(vb,&rrp->addrs[i]);
 619     }
 620     CSP_ADDSTR(" )");
 621   } else {
 622     CSP_ADDSTR(" ?");
 623   }
 624   return adns_s_ok;
 625 }
 626
 627 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 628   const adns_rr_hostaddr *rrp= datap;
 629
 630   return csp_hostaddr(vb,rrp);
 631 }
 632
 633 /*
 634  * _mx_raw   (pa,di)
 635  */
 636
 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;
 641   adns_status st;
 642   int pref;
 643
 644   if (cbyte+2 > max) return adns_s_invaliddata;
 645   GET_W(cbyte,pref);
 646   rrp->i= pref;
 647   st= pap_domain(pai, &cbyte, max, &rrp->str,
 648                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 649   if (st) return st;
 650
 651   if (cbyte != max) return adns_s_invaliddata;
 652   return adns_s_ok;
 653 }
 654
 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;
 657
 658   if (ap->i < bp->i) return 0;
 659   if (ap->i > bp->i) return 1;
 660   return 0;
 661 }
 662
 663 /*
 664  * _mx   (pa,di)
 665  */
 666
 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;
 671   adns_status st;
 672   int pref;
 673
 674   if (cbyte+2 > max) return adns_s_invaliddata;
 675   GET_W(cbyte,pref);
 676   rrp->i= pref;
 677   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 678   if (st) return st;
 679
 680   if (cbyte != max) return adns_s_invaliddata;
 681   return adns_s_ok;
 682 }
 683
 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;
 686
 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);
 690 }
 691
 692 /*
 693  * _inthostaddr  (mf,cs)
 694  */
 695
 696 static void mf_inthostaddr(adns_query qu, void *datap) {
 697   adns_rr_inthostaddr *rrp= datap;
 698
 699   mfp_hostaddr(qu,&rrp->ha);
 700 }
 701
 702 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
 703   const adns_rr_inthostaddr *rrp= datap;
 704   char buf[10];
 705
 706   sprintf(buf,"%u ",rrp->i);
 707   CSP_ADDSTR(buf);
 708
 709   return csp_hostaddr(vb,&rrp->ha);
 710 }
 711
 712 /*
 713  * _inthost  (cs)
 714  */
 715
 716 static adns_status cs_inthost(vbuf *vb, const void *datap) {
 717   const adns_rr_intstr *rrp= datap;
 718   char buf[10];
 719
 720   sprintf(buf,"%u ",rrp->i);
 721   CSP_ADDSTR(buf);
 722   return csp_domain(vb,rrp->str);
 723 }
 724
 725 /*
 726  * _ptr   (ckl,pa +icb_ptr)
 727  */
 728
 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 };
 733   char *ep;
 734   const char *ed;
 735   char labbuf[4];
 736   int l;
 737
 738   if (labnum < 4) {
 739     if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
 740     memcpy(labbuf, label, lablen);
 741     labbuf[lablen]= 0;
 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];
 747     l= strlen(ed);
 748     if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong;
 749   } else {
 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]));
 755   }
 756   return adns_s_ok;
 757 }
 758
 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;
 764   int i;
 765
 766   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
 767     adns__query_fail(parent,adns_s_inconsistent);
 768     return;
 769   } else if (cans->status) {
 770     adns__query_fail(parent,cans->status);
 771     return;
 772   }
 773
 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);
 781         return;
 782       } else {
 783         LIST_LINK_TAIL(ads->childw,parent);
 784         return;
 785       }
 786     }
 787   }
 788
 789   adns__query_fail(parent,adns_s_inconsistent);
 790 }
 791
 792 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
 793                           int max, void *datap) {
 794   char **rrp= datap;
 795   adns_status st;
 796   int cbyte, id;
 797   adns_query nqu;
 798   qcontext ctx;
 799
 800   cbyte= dmstart;
 801   st= pap_domain(pai, &cbyte, max, rrp,
 802                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 803   if (st) return st;
 804   if (cbyte != max) return adns_s_invaliddata;
 805
 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);
 809   if (st) return st;
 810
 811   ctx.ext= 0;
 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,
 817                             pai->now, &ctx);
 818   if (st) return st;
 819
 820   nqu->parent= pai->qu;
 821   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 822   return adns_s_ok;
 823 }
 824
 825 /*
 826  * _strpair   (mf)
 827  */
 828
 829 static void mf_strpair(adns_query qu, void *datap) {
 830   adns_rr_strpair *rrp= datap;
 831
 832   adns__makefinal_str(qu,&rrp->array[0]);
 833   adns__makefinal_str(qu,&rrp->array[1]);
 834 }
 835
 836 /*
 837  * _intstrpair   (mf)
 838  */
 839
 840 static void mf_intstrpair(adns_query qu, void *datap) {
 841   adns_rr_intstrpair *rrp= datap;
 842
 843   adns__makefinal_str(qu,&rrp->array[0].str);
 844   adns__makefinal_str(qu,&rrp->array[1].str);
 845 }
 846
 847 /*
 848  * _hinfo   (pa)
 849  */
 850
 851 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
 852                             int max, void *datap) {
 853   adns_rr_intstrpair *rrp= datap;
 854   adns_status st;
 855   int i;
 856
 857   for (i=0; i<2; i++) {
 858     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
 859     if (st) return st;
 860   }
 861
 862   if (cbyte != max) return adns_s_invaliddata;
 863
 864   return adns_s_ok;
 865 }
 866
 867 /*
 868  * _mailbox   (pap,cs +pap_mailbox822)
 869  */
 870
 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;
 875   char *str;
 876   findlabel_state fls;
 877   adns_status st;
 878   vbuf *vb;
 879
 880   vb= &pai->qu->vb;
 881   vb->used= 0;
 882   adns__findlabel_start(&fls, pai->ads,
 883                         -1, pai->qu,
 884                         pai->dgram, pai->dglen, max,
 885                         *cbyte_io, cbyte_io);
 886   st= adns__findlabel_next(&fls,&lablen,&labstart);
 887   if (!lablen) {
 888     adns__vbuf_appendstr(vb,".");
 889     goto x_ok;
 890   }
 891
 892   neednorm= 1;
 893   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
 894     c= *p++;
 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++;
 898     else neednorm= 0;
 899   }
 900
 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++) {
 905       c= *p;
 906       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
 907       adns__vbuf_appendq(vb,p,1);
 908     }
 909     adns__vbuf_appendq(vb,"\"",1);
 910   } else {
 911     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
 912   }
 913
 914   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
 915
 916   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
 917   if (st) return st;
 918
 919  x_ok:
 920   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
 921   memcpy(str,vb->buf,vb->used);
 922   str[vb->used]= 0;
 923   *mb_r= str;
 924   return adns_s_ok;
 925 }
 926
 927 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
 928                                char **mb_r) {
 929   if (pai->qu->typei->typekey & adns__qtf_mail822) {
 930     return pap_mailbox822(pai, cbyte_io, max, mb_r);
 931   } else {
 932     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
 933   }
 934 }
 935
 936 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
 937   return csp_domain(vb,mailbox);
 938 }
 939
 940 /*
 941  * _rp   (pa,cs)
 942  */
 943
 944 static adns_status pa_rp(const parseinfo *pai, int cbyte,
 945                          int max, void *datap) {
 946   adns_rr_strpair *rrp= datap;
 947   adns_status st;
 948
 949   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
 950   if (st) return st;
 951
 952   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
 953   if (st) return st;
 954
 955   if (cbyte != max) return adns_s_invaliddata;
 956   return adns_s_ok;
 957 }
 958
 959 static adns_status cs_rp(vbuf *vb, const void *datap) {
 960   const adns_rr_strpair *rrp= datap;
 961   adns_status st;
 962
 963   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
 964   CSP_ADDSTR(" ");
 965   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
 966
 967   return adns_s_ok;
 968 }
 969
 970 /*
 971  * _soa   (pa,mf,cs)
 972  */
 973
 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;
 978   adns_status st;
 979   int msw, lsw, i;
 980
 981   st= pap_domain(pai, &cbyte, max, &rrp->mname,
 982                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 983   if (st) return st;
 984
 985   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
 986   if (st) return st;
 987
 988   if (cbyte+20 != max) return adns_s_invaliddata;
 989
 990   for (i=0; i<5; i++) {
 991     GET_W(cbyte,msw);
 992     GET_W(cbyte,lsw);
 993     (&rrp->serial)[i]= (msw<<16) | lsw;
 994   }
 995
 996   return adns_s_ok;
 997 }
 998
 999 static void mf_soa(adns_query qu, void *datap) {
1000   adns_rr_soa *rrp= datap;
1001
1002   adns__makefinal_str(qu,&rrp->mname);
1003   adns__makefinal_str(qu,&rrp->rname);
1004 }
1005
1006 static adns_status cs_soa(vbuf *vb, const void *datap) {
1007   const adns_rr_soa *rrp= datap;
1008   char buf[20];
1009   int i;
1010   adns_status st;
1011
1012   st= csp_domain(vb,rrp->mname);  if (st) return st;
1013   CSP_ADDSTR(" ");
1014   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
1015
1016   for (i=0; i<5; i++) {
1017     sprintf(buf," %lu",(&rrp->serial)[i]);
1018     CSP_ADDSTR(buf);
1019   }
1020
1021   return adns_s_ok;
1022 }
1023
1024 /*
1025  * _srv*  (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1026  */
1027
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;
1033     return adns_s_ok;
1034   }
1035   return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1036 }
1037
1038 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1039                                  adns_rr_srvha *rrp
1040                                    /* might be adns_rr_srvraw* */) {
1041   const byte *dgram= pai->dgram;
1042   int ti, cbyte;
1043
1044   cbyte= *cbyte_io;
1045   if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1046
1047   rrp->priority= GET_W(cbyte, ti);
1048   rrp->weight=   GET_W(cbyte, ti);
1049   rrp->port=     GET_W(cbyte, ti);
1050   return adns_s_ok;
1051 }
1052
1053 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1054                              int max, void *datap) {
1055   adns_rr_srvraw *rrp= datap;
1056   adns_status st;
1057
1058   st= pap_srv_begin(pai,&cbyte,max,datap);
1059   if (st) return st;
1060
1061   st= pap_domain(pai, &cbyte, max, &rrp->host,
1062                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1063   if (st) return st;
1064
1065   if (cbyte != max) return adns_s_invaliddata;
1066   return adns_s_ok;
1067 }
1068
1069 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1070                             int max, void *datap) {
1071   adns_rr_srvha *rrp= datap;
1072   adns_status st;
1073
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;
1077   return adns_s_ok;
1078 }
1079
1080 static void mf_srvraw(adns_query qu, void *datap) {
1081   adns_rr_srvraw *rrp= datap;
1082   adns__makefinal_str(qu, &rrp->host);
1083 }
1084
1085 static void mf_srvha(adns_query qu, void *datap) {
1086   adns_rr_srvha *rrp= datap;
1087   mfp_hostaddr(qu,&rrp->ha);
1088 }
1089
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* */
1093
1094   if (ap->priority < bp->priority) return 0;
1095   if (ap->priority > bp->priority) return 1;
1096   return 0;
1097 }
1098
1099 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1100                                    /* might be adns_rr_srvraw* */) {
1101   char buf[30];
1102   sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1103   CSP_ADDSTR(buf);
1104   return adns_s_ok;
1105 }
1106
1107 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1108   const adns_rr_srvraw *rrp= datap;
1109   adns_status st;
1110
1111   st= csp_srv_begin(vb,(const void*)rrp);  if (st) return st;
1112   return csp_domain(vb,rrp->host);
1113 }
1114
1115 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1116   const adns_rr_srvha *rrp= datap;
1117   adns_status st;
1118
1119   st= csp_srv_begin(vb,(const void*)datap);  if (st) return st;
1120   return csp_hostaddr(vb,&rrp->ha);
1121 }
1122
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.
1129    */
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;
1134   long randval;
1135
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;
1141
1142     for (workend= workbegin, totalweight= 0;
1143          workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1144          workend += rrsz) {
1145       totalweight += rr->weight;
1146     }
1147
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. */
1154     for (;
1155          workbegin + rrsz < workend; /* don't bother if just one */
1156          workbegin += rrsz) {
1157
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).
1164          */
1165
1166       for (search=workbegin, runtotal=0;
1167            (runtotal += (rr=(void*)search)->weight) < randval;
1168            search += rrsz);
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);
1175       }
1176     }
1177   }
1178   /* tests:
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
1182    */
1183 }
1184
1185 /*
1186  * _byteblock   (mf)
1187  */
1188
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);
1193   rrp->data= bytes;
1194 }
1195
1196 /*
1197  * _opaque   (pa,cs)
1198  */
1199
1200 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1201                              int max, void *datap) {
1202   adns_rr_byteblock *rrp= datap;
1203
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);
1208   return adns_s_ok;
1209 }
1210
1211 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1212   const adns_rr_byteblock *rrp= datap;
1213   char buf[10];
1214   int l;
1215   unsigned char *p;
1216
1217   sprintf(buf,"\\# %d",rrp->len);
1218   CSP_ADDSTR(buf);
1219
1220   for (l= rrp->len, p= rrp->data;
1221        l>=4;
1222        l -= 4, p += 4) {
1223     sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1224     CSP_ADDSTR(buf);
1225   }
1226   for (;
1227        l>0;
1228        l--, p++) {
1229     sprintf(buf," %02x",*p);
1230     CSP_ADDSTR(buf);
1231   }
1232   return adns_s_ok;
1233 }
1234
1235 /*
1236  * _flat   (mf)
1237  */
1238
1239 static void mf_flat(adns_query qu, void *data) { }
1240
1241 /*
1242  * Now the table.
1243  */
1244
1245 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
1246
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__) }
1255
1256 #define di_0 0
1257
1258 static const typeinfo typeinfos[] = {
1259 /* Must be in ascending order of rrtype ! */
1260 /* mem-mgmt code  rrt     fmt   member   parser      comparer  printer */
1261
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),
1273
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),
1282
1283 DEEP_TYPE(soa,    "SOA","822",  soa,       soa,     0,     soa             ),
1284 DEEP_TYPE(rp,     "RP", "822",  strpair,   rp,      0,     rp              ),
1285 };
1286
1287 static const typeinfo typeinfo_unknown=
1288 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque,  0,     opaque            );
1289
1290 const typeinfo *adns__findtype(adns_rrtype type) {
1291   const typeinfo *begin, *end, *mid;
1292
1293   if (type & adns_r_unknown) return &typeinfo_unknown;
1294   type &= adns_rrt_reprmask;
1295
1296   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1297
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;
1302     else end= mid;
1303   }
1304   return 0;
1305 }