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