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  *    qs_*
  89  */
  90
  91 /*
  92  * _qstring               (pap,csp)
  93  */
  94
  95 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
  96                               int *len_r, char **str_r) {
  97   /* Neither len_r nor str_r may be null.
  98    * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
  99    */
 100   const byte *dgram= pai->dgram;
 101   int l, cbyte;
 102   char *str;
 103
 104   cbyte= *cbyte_io;
 105
 106   if (cbyte >= max) return adns_s_invaliddata;
 107   GET_B(cbyte,l);
 108   if (cbyte+l > max) return adns_s_invaliddata;
 109
 110   str= adns__alloc_interim(pai->qu, l+1);
 111   if (!str) R_NOMEM;
 112
 113   str[l]= 0;
 114   memcpy(str,dgram+cbyte,l);
 115
 116   *len_r= l;
 117   *str_r= str;
 118   *cbyte_io= cbyte+l;
 119
 120   return adns_s_ok;
 121 }
 122
 123 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
 124   unsigned char ch;
 125   char buf[10];
 126   int cn;
 127
 128   CSP_ADDSTR("\"");
 129   for (cn=0; cn<len; cn++) {
 130     ch= *dp++;
 131     if (ch == '\\') {
 132       CSP_ADDSTR("\\\\");
 133     } else if (ch == '"') {
 134       CSP_ADDSTR("\\\"");
 135     } else if (ch >= 32 && ch <= 126) {
 136       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 137     } else {
 138       sprintf(buf,"\\x%02x",ch);
 139       CSP_ADDSTR(buf);
 140     }
 141   }
 142   CSP_ADDSTR("\"");
 143
 144   return adns_s_ok;
 145 }
 146
 147 /*
 148  * _str  (mf)
 149  */
 150
 151 static void mf_str(adns_query qu, void *datap) {
 152   char **rrp= datap;
 153
 154   adns__makefinal_str(qu,rrp);
 155 }
 156
 157 /*
 158  * _intstr  (mf)
 159  */
 160
 161 static void mf_intstr(adns_query qu, void *datap) {
 162   adns_rr_intstr *rrp= datap;
 163
 164   adns__makefinal_str(qu,&rrp->str);
 165 }
 166
 167 /*
 168  * _manyistr   (mf)
 169  */
 170
 171 static void mf_manyistr(adns_query qu, void *datap) {
 172   adns_rr_intstr **rrp= datap;
 173   adns_rr_intstr *te, *table;
 174   void *tablev;
 175   int tc;
 176
 177   for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
 178   tablev= *rrp;
 179   adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
 180   *rrp= table= tablev;
 181   for (te= *rrp; te->i >= 0; te++)
 182     adns__makefinal_str(qu,&te->str);
 183 }
 184
 185 /*
 186  * _txt   (pa,cs)
 187  */
 188
 189 static adns_status pa_txt(const parseinfo *pai, int cbyte,
 190                           int max, void *datap) {
 191   adns_rr_intstr **rrp= datap, *table, *te;
 192   const byte *dgram= pai->dgram;
 193   int ti, tc, l, startbyte;
 194   adns_status st;
 195
 196   startbyte= cbyte;
 197   if (cbyte >= max) return adns_s_invaliddata;
 198   tc= 0;
 199   while (cbyte < max) {
 200     GET_B(cbyte,l);
 201     cbyte+= l;
 202     tc++;
 203   }
 204   if (cbyte != max || !tc) return adns_s_invaliddata;
 205
 206   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 207   if (!table) R_NOMEM;
 208
 209   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 210     st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
 211     if (st) return st;
 212   }
 213   assert(cbyte == max);
 214
 215   te->i= -1;
 216   te->str= 0;
 217
 218   *rrp= table;
 219   return adns_s_ok;
 220 }
 221
 222 static adns_status cs_txt(vbuf *vb, const void *datap) {
 223   const adns_rr_intstr *const *rrp= datap;
 224   const adns_rr_intstr *current;
 225   adns_status st;
 226   int spc;
 227
 228   for (current= *rrp, spc=0;  current->i >= 0;  current++, spc=1) {
 229     if (spc) CSP_ADDSTR(" ");
 230     st= csp_qstring(vb,current->str,current->i); if (st) return st;
 231   }
 232   return adns_s_ok;
 233 }
 234
 235 /*
 236  * _hinfo   (cs)
 237  */
 238
 239 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
 240   const adns_rr_intstrpair *rrp= datap;
 241   adns_status st;
 242
 243   st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i);  if (st) return st;
 244   CSP_ADDSTR(" ");
 245   st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i);  if (st) return st;
 246   return adns_s_ok;
 247 }
 248
 249 /*
 250  * _inaddr   (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
 251  */
 252
 253 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
 254                              int max, void *datap) {
 255   struct in_addr *storeto= datap;
 256
 257   if (max-cbyte != 4) return adns_s_invaliddata;
 258   memcpy(storeto, pai->dgram + cbyte, 4);
 259   return adns_s_ok;
 260 }
 261
 262 static int search_sortlist(adns_state ads, int af, const void *ad) {
 263   const struct sortlist *slp;
 264   const struct in6_addr *a6;
 265   union gen_addr a;
 266   int i;
 267   int v6mappedp= 0;
 268
 269   if (af == AF_INET6) {
 270     a6= ad;
 271     if (IN6_IS_ADDR_V4MAPPED(a6)) {
 272       a.v4.s_addr= htonl(((unsigned long)a6->s6_addr[12] << 24) |
 273                          ((unsigned long)a6->s6_addr[13] << 16) |
 274                          ((unsigned long)a6->s6_addr[14] <<  8) |
 275                          ((unsigned long)a6->s6_addr[15] <<  0));
 276       v6mappedp= 1;
 277     }
 278   }
 279
 280   for (i=0, slp=ads->sortlist;
 281        i<ads->nsortlist &&
 282          !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask) &&
 283          !(v6mappedp &&
 284            adns__addr_match_p(AF_INET,&a, slp->af,&slp->base,&slp->mask));
 285        i++, slp++);
 286   return i;
 287 }
 288
 289 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
 290   int ai, bi;
 291
 292   if (!ads->nsortlist) return 0;
 293
 294   ai= search_sortlist(ads,af,a);
 295   bi= search_sortlist(ads,af,b);
 296   return bi<ai;
 297 }
 298
 299 static int di_inaddr(adns_state ads,
 300                      const void *datap_a, const void *datap_b) {
 301   return dip_genaddr(ads,AF_INET,datap_a,datap_b);
 302 }
 303
 304 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
 305   char buf[ADNS_ADDR2TEXT_BUFLEN];
 306   int len= sizeof(buf);
 307   adns_rr_addr a;
 308   int err;
 309
 310   memset(&a, 0, sizeof(a));
 311   a.addr.sa.sa_family= af;
 312   adns__sockaddr_inject(p, 0, &a.addr.sa);
 313   err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
 314   CSP_ADDSTR(buf);
 315   return adns_s_ok;
 316 }
 317
 318 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 319   return csp_genaddr(vb, AF_INET,datap);
 320 }
 321
 322 /*
 323  * _in6addr   (pa,di,cs)
 324  */
 325
 326 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
 327                              int max, void *datap) {
 328   struct in6_addr *storeto= datap;
 329
 330   if (max-cbyte != 16) return adns_s_invaliddata;
 331   memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
 332   return adns_s_ok;
 333 }
 334
 335 static int di_in6addr(adns_state ads,
 336                      const void *datap_a, const void *datap_b) {
 337   return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
 338 }
 339
 340 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
 341   return csp_genaddr(vb,AF_INET6,datap);
 342 }
 343
 344 /*
 345  * _addr   (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr)
 346  */
 347
 348 static adns_status pa_addr(const parseinfo *pai, int cbyte,
 349                            int max, void *datap) {
 350   adns_rr_addr *storeto= datap;
 351   const byte *dgram= pai->dgram;
 352
 353   if (max-cbyte != 4) return adns_s_invaliddata;
 354   storeto->len= sizeof(storeto->addr.inet);
 355   memset(&storeto->addr,0,sizeof(storeto->addr.inet));
 356   storeto->addr.inet.sin_family= AF_INET;
 357   memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
 358   return adns_s_ok;
 359 }
 360
 361 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
 362   union gen_addr a;
 363   adns__sockaddr_extract(sa, &a, 0);
 364   return search_sortlist(ads, sa->sa_family, &a);
 365 }
 366
 367 static int dip_sockaddr(adns_state ads,
 368                         const struct sockaddr *sa,
 369                         const struct sockaddr *sb) {
 370   if (!ads->sortlist) return 0;
 371   return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
 372 }
 373
 374 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 375   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 376   return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
 377 }
 378
 379 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 380   const adns_state ads= context;
 381
 382   return di_addr(ads, datap_a, datap_b);
 383 }
 384
 385 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 386   char buf[ADNS_ADDR2TEXT_BUFLEN];
 387   int len= sizeof(buf);
 388   int err;
 389
 390   switch (rrp->addr.inet.sin_family) {
 391   case AF_INET:
 392     CSP_ADDSTR("INET ");
 393     goto a2t;
 394   case AF_INET6:
 395     CSP_ADDSTR("INET6 ");
 396     goto a2t;
 397   a2t:
 398     err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
 399     CSP_ADDSTR(buf);
 400     break;
 401   default:
 402     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 403     CSP_ADDSTR(buf);
 404     break;
 405   }
 406   return adns_s_ok;
 407 }
 408
 409 static adns_status cs_addr(vbuf *vb, const void *datap) {
 410   const adns_rr_addr *rrp= datap;
 411
 412   return csp_addr(vb,rrp);
 413 }
 414
 415 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
 416   return type & adns__qtf_bigaddr ?
 417     sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
 418 }
 419
 420 /*
 421  * _domain      (pap,csp,cs)
 422  * _dom_raw     (pa)
 423  */
 424
 425 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 426                               char **domain_r, parsedomain_flags flags) {
 427   adns_status st;
 428   char *dm;
 429
 430   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 431                          pai->dgram,pai->dglen, cbyte_io, max);
 432   if (st) return st;
 433   if (!pai->qu->vb.used) return adns_s_invaliddata;
 434
 435   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 436   if (!dm) R_NOMEM;
 437
 438   dm[pai->qu->vb.used]= 0;
 439   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 440
 441   *domain_r= dm;
 442   return adns_s_ok;
 443 }
 444
 445 static adns_status csp_domain(vbuf *vb, const char *domain) {
 446   CSP_ADDSTR(domain);
 447   if (!*domain) CSP_ADDSTR(".");
 448   return adns_s_ok;
 449 }
 450
 451 static adns_status cs_domain(vbuf *vb, const void *datap) {
 452   const char *const *domainp= datap;
 453   return csp_domain(vb,*domainp);
 454 }
 455
 456 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
 457                               int max, void *datap) {
 458   char **rrp= datap;
 459   adns_status st;
 460
 461   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 462   if (st) return st;
 463
 464   if (cbyte != max) return adns_s_invaliddata;
 465   return adns_s_ok;
 466 }
 467
 468 /*
 469  * _host_raw   (pa)
 470  */
 471
 472 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
 473                                int max, void *datap) {
 474   char **rrp= datap;
 475   adns_status st;
 476
 477   st= pap_domain(pai, &cbyte, max, rrp,
 478                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 479   if (st) return st;
 480
 481   if (cbyte != max) return adns_s_invaliddata;
 482   return adns_s_ok;
 483 }
 484
 485 /*
 486  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
 487  */
 488
 489 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 490                                  size_t addrsz,
 491                                  int *cbyte_io, int count, int dmstart) {
 492   int rri, naddrs;
 493   int type, class, rdlen, rdstart, ownermatched;
 494   unsigned long ttl;
 495   adns_status st;
 496
 497   for (rri=0, naddrs=-1; rri<count; rri++) {
 498     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
 499                             pai->dglen, cbyte_io,
 500                             &type, &class, &ttl, &rdlen, &rdstart,
 501                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 502     if (st) return st;
 503     if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
 504       if (naddrs>0) break; else continue;
 505     }
 506     if (naddrs == -1) {
 507       naddrs= 0;
 508     }
 509     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz))
 510       R_NOMEM;
 511     adns__update_expires(pai->qu,ttl,pai->now);
 512     st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz);
 513     if (st) return st;
 514     naddrs++;
 515   }
 516   if (naddrs >= 0) {
 517     ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz);
 518     if (!ha->addrs) R_NOMEM;
 519     memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz);
 520     ha->naddrs= naddrs;
 521     ha->astatus= adns_s_ok;
 522
 523     adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
 524                 div_addr, pai->ads);
 525   }
 526   return adns_s_ok;
 527 }
 528
 529 static void icb_hostaddr(adns_query parent, adns_query child) {
 530   adns_answer *cans= child->answer;
 531   adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
 532   adns_state ads= parent->ads;
 533   adns_status st;
 534
 535   st= cans->status;
 536   rrp->astatus= st;
 537   rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
 538   rrp->addrs= cans->rrs.addr;
 539   adns__transfer_interim(child, parent, rrp->addrs);
 540
 541   if (parent->children.head) {
 542     LIST_LINK_TAIL(ads->childw,parent);
 543   } else {
 544     adns__query_done(parent);
 545   }
 546 }
 547
 548 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 549                                 int max, adns_rr_hostaddr *rrp) {
 550   adns_status st;
 551   int dmstart, cbyte;
 552   qcontext ctx;
 553   int id;
 554   adns_query nqu;
 555   adns_queryflags nflags;
 556   size_t addrsz= gsz_addr(0, pai->qu->answer->type);
 557
 558   dmstart= cbyte= *cbyte_io;
 559   st= pap_domain(pai, &cbyte, max, &rrp->host,
 560                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 561   if (st) return st;
 562   *cbyte_io= cbyte;
 563
 564   rrp->astatus= adns_s_ok;
 565   rrp->naddrs= -1;
 566   rrp->addrs= 0;
 567
 568   cbyte= pai->nsstart;
 569
 570   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart);
 571   if (st) return st;
 572   if (rrp->naddrs != -1) return adns_s_ok;
 573
 574   st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart);
 575   if (st) return st;
 576   if (rrp->naddrs != -1) return adns_s_ok;
 577
 578   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 579                             pai->dgram, pai->dglen, dmstart,
 580                             adns_r_addr, adns_qf_quoteok_query);
 581   if (st) return st;
 582
 583   ctx.ext= 0;
 584   ctx.callback= icb_hostaddr;
 585   ctx.pinfo.hostaddr= rrp;
 586   memset(&ctx.tinfo, 0, sizeof(ctx.tinfo));
 587
 588   nflags= adns_qf_quoteok_query;
 589   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 590
 591   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 592                             ((adns_r_addr & adns_rrt_reprmask) |
 593                              (pai->qu->answer->type & ~adns_rrt_reprmask)),
 594                             &pai->qu->vb, id, nflags, pai->now, &ctx);
 595   if (st) return st;
 596
 597   nqu->parent= pai->qu;
 598   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 599
 600   return adns_s_ok;
 601 }
 602
 603 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
 604                                int max, void *datap) {
 605   adns_rr_hostaddr *rrp= datap;
 606   adns_status st;
 607
 608   st= pap_hostaddr(pai, &cbyte, max, rrp);
 609   if (st) return st;
 610   if (cbyte != max) return adns_s_invaliddata;
 611
 612   return adns_s_ok;
 613 }
 614
 615 static int dip_hostaddr(adns_state ads,
 616                         const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 617   if (ap->astatus != bp->astatus) return ap->astatus;
 618   if (ap->astatus) return 0;
 619
 620   return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
 621 }
 622
 623 static int di_hostaddr(adns_state ads,
 624                        const void *datap_a, const void *datap_b) {
 625   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 626
 627   return dip_hostaddr(ads, ap,bp);
 628 }
 629
 630 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 631   void *tablev;
 632   size_t addrsz= gsz_addr(0, qu->answer->type);
 633
 634   adns__makefinal_str(qu,&rrp->host);
 635   tablev= rrp->addrs;
 636   adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
 637   rrp->addrs= tablev;
 638 }
 639
 640 static void mf_hostaddr(adns_query qu, void *datap) {
 641   adns_rr_hostaddr *rrp= datap;
 642
 643   mfp_hostaddr(qu,rrp);
 644 }
 645
 646 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 647   const char *errstr;
 648   adns_status st;
 649   char buf[20];
 650   int i;
 651
 652   st= csp_domain(vb,rrp->host);  if (st) return st;
 653
 654   CSP_ADDSTR(" ");
 655   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 656
 657   sprintf(buf," %d ",rrp->astatus);
 658   CSP_ADDSTR(buf);
 659
 660   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 661   CSP_ADDSTR(" ");
 662
 663   errstr= adns_strerror(rrp->astatus);
 664   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 665
 666   if (rrp->naddrs >= 0) {
 667     CSP_ADDSTR(" (");
 668     for (i=0; i<rrp->naddrs; i++) {
 669       CSP_ADDSTR(" ");
 670       st= csp_addr(vb,&rrp->addrs[i]);
 671     }
 672     CSP_ADDSTR(" )");
 673   } else {
 674     CSP_ADDSTR(" ?");
 675   }
 676   return adns_s_ok;
 677 }
 678
 679 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 680   const adns_rr_hostaddr *rrp= datap;
 681
 682   return csp_hostaddr(vb,rrp);
 683 }
 684
 685 /*
 686  * _mx_raw   (pa,di)
 687  */
 688
 689 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
 690                              int max, void *datap) {
 691   const byte *dgram= pai->dgram;
 692   adns_rr_intstr *rrp= datap;
 693   adns_status st;
 694   int pref;
 695
 696   if (cbyte+2 > max) return adns_s_invaliddata;
 697   GET_W(cbyte,pref);
 698   rrp->i= pref;
 699   st= pap_domain(pai, &cbyte, max, &rrp->str,
 700                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 701   if (st) return st;
 702
 703   if (cbyte != max) return adns_s_invaliddata;
 704   return adns_s_ok;
 705 }
 706
 707 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 708   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 709
 710   if (ap->i < bp->i) return 0;
 711   if (ap->i > bp->i) return 1;
 712   return 0;
 713 }
 714
 715 /*
 716  * _mx   (pa,di)
 717  */
 718
 719 static adns_status pa_mx(const parseinfo *pai, int cbyte,
 720                          int max, void *datap) {
 721   const byte *dgram= pai->dgram;
 722   adns_rr_inthostaddr *rrp= datap;
 723   adns_status st;
 724   int pref;
 725
 726   if (cbyte+2 > max) return adns_s_invaliddata;
 727   GET_W(cbyte,pref);
 728   rrp->i= pref;
 729   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 730   if (st) return st;
 731
 732   if (cbyte != max) return adns_s_invaliddata;
 733   return adns_s_ok;
 734 }
 735
 736 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
 737   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
 738
 739   if (ap->i < bp->i) return 0;
 740   if (ap->i > bp->i) return 1;
 741   return dip_hostaddr(ads, &ap->ha, &bp->ha);
 742 }
 743
 744 /*
 745  * _inthostaddr  (mf,cs)
 746  */
 747
 748 static void mf_inthostaddr(adns_query qu, void *datap) {
 749   adns_rr_inthostaddr *rrp= datap;
 750
 751   mfp_hostaddr(qu,&rrp->ha);
 752 }
 753
 754 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
 755   const adns_rr_inthostaddr *rrp= datap;
 756   char buf[10];
 757
 758   sprintf(buf,"%u ",rrp->i);
 759   CSP_ADDSTR(buf);
 760
 761   return csp_hostaddr(vb,&rrp->ha);
 762 }
 763
 764 /*
 765  * _inthost  (cs)
 766  */
 767
 768 static adns_status cs_inthost(vbuf *vb, const void *datap) {
 769   const adns_rr_intstr *rrp= datap;
 770   char buf[10];
 771
 772   sprintf(buf,"%u ",rrp->i);
 773   CSP_ADDSTR(buf);
 774   return csp_domain(vb,rrp->str);
 775 }
 776
 777 /*
 778  * _ptr   (ckl,pa +icb_ptr)
 779  */
 780
 781 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
 782                            union checklabel_state *cls, qcontext *ctx,
 783                            int labnum, const char *label, int lablen) {
 784   if (lablen) {
 785     if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
 786       return adns_s_querydomainwrong;
 787   } else {
 788     if (adns__revparse_done(&cls->ptr, labnum,
 789                             &ctx->tinfo.ptr.rev_rrtype,
 790                             &ctx->tinfo.ptr.addr))
 791       return adns_s_querydomainwrong;
 792   }
 793   return adns_s_ok;
 794 }
 795
 796 static void icb_ptr(adns_query parent, adns_query child) {
 797   adns_answer *cans= child->answer;
 798   const struct af_addr *queried;
 799   const unsigned char *found;
 800   adns_state ads= parent->ads;
 801   int i;
 802
 803   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
 804     adns__query_fail(parent,adns_s_inconsistent);
 805     return;
 806   } else if (cans->status) {
 807     adns__query_fail(parent,cans->status);
 808     return;
 809   }
 810
 811   queried= &parent->ctx.tinfo.ptr.addr;
 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,
 814                               parent->ctx.tinfo.ptr.addr.af,found)) {
 815       if (!parent->children.head) {
 816         adns__query_done(parent);
 817         return;
 818       } else {
 819         LIST_LINK_TAIL(ads->childw,parent);
 820         return;
 821       }
 822     }
 823   }
 824
 825   adns__query_fail(parent,adns_s_inconsistent);
 826 }
 827
 828 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
 829                           int max, void *datap) {
 830   char **rrp= datap;
 831   adns_status st;
 832   adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
 833   int cbyte, id;
 834   adns_query nqu;
 835   qcontext ctx;
 836
 837   cbyte= dmstart;
 838   st= pap_domain(pai, &cbyte, max, rrp,
 839                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 840   if (st) return st;
 841   if (cbyte != max) return adns_s_invaliddata;
 842
 843   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 844                             pai->dgram, pai->dglen, dmstart,
 845                             rrtype, adns_qf_quoteok_query);
 846   if (st) return st;
 847
 848   ctx.ext= 0;
 849   ctx.callback= icb_ptr;
 850   memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
 851   memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
 852   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(rrtype),
 853                             rrtype, &pai->qu->vb, id,
 854                             adns_qf_quoteok_query, pai->now, &ctx);
 855   if (st) return st;
 856
 857   nqu->parent= pai->qu;
 858   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 859   return adns_s_ok;
 860 }
 861
 862 /*
 863  * _strpair   (mf)
 864  */
 865
 866 static void mf_strpair(adns_query qu, void *datap) {
 867   adns_rr_strpair *rrp= datap;
 868
 869   adns__makefinal_str(qu,&rrp->array[0]);
 870   adns__makefinal_str(qu,&rrp->array[1]);
 871 }
 872
 873 /*
 874  * _intstrpair   (mf)
 875  */
 876
 877 static void mf_intstrpair(adns_query qu, void *datap) {
 878   adns_rr_intstrpair *rrp= datap;
 879
 880   adns__makefinal_str(qu,&rrp->array[0].str);
 881   adns__makefinal_str(qu,&rrp->array[1].str);
 882 }
 883
 884 /*
 885  * _hinfo   (pa)
 886  */
 887
 888 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
 889                             int max, void *datap) {
 890   adns_rr_intstrpair *rrp= datap;
 891   adns_status st;
 892   int i;
 893
 894   for (i=0; i<2; i++) {
 895     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
 896     if (st) return st;
 897   }
 898
 899   if (cbyte != max) return adns_s_invaliddata;
 900
 901   return adns_s_ok;
 902 }
 903
 904 /*
 905  * _mailbox   (pap,cs +pap_mailbox822)
 906  */
 907
 908 static adns_status pap_mailbox822(const parseinfo *pai,
 909                                   int *cbyte_io, int max, char **mb_r) {
 910   int lablen, labstart, i, needquote, c, r, neednorm;
 911   const unsigned char *p;
 912   char *str;
 913   findlabel_state fls;
 914   adns_status st;
 915   vbuf *vb;
 916
 917   vb= &pai->qu->vb;
 918   vb->used= 0;
 919   adns__findlabel_start(&fls, pai->ads,
 920                         -1, pai->qu,
 921                         pai->dgram, pai->dglen, max,
 922                         *cbyte_io, cbyte_io);
 923   st= adns__findlabel_next(&fls,&lablen,&labstart);
 924   if (!lablen) {
 925     adns__vbuf_appendstr(vb,".");
 926     goto x_ok;
 927   }
 928
 929   neednorm= 1;
 930   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
 931     c= *p++;
 932     if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
 933     if (c == '.' && !neednorm) neednorm= 1;
 934     else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
 935     else neednorm= 0;
 936   }
 937
 938   if (needquote || neednorm) {
 939     r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
 940     adns__vbuf_appendq(vb,"\"",1);
 941     for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
 942       c= *p;
 943       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
 944       adns__vbuf_appendq(vb,p,1);
 945     }
 946     adns__vbuf_appendq(vb,"\"",1);
 947   } else {
 948     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
 949   }
 950
 951   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
 952
 953   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
 954   if (st) return st;
 955
 956  x_ok:
 957   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
 958   memcpy(str,vb->buf,vb->used);
 959   str[vb->used]= 0;
 960   *mb_r= str;
 961   return adns_s_ok;
 962 }
 963
 964 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
 965                                char **mb_r) {
 966   if (pai->qu->typei->typekey & adns__qtf_mail822) {
 967     return pap_mailbox822(pai, cbyte_io, max, mb_r);
 968   } else {
 969     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
 970   }
 971 }
 972
 973 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
 974   return csp_domain(vb,mailbox);
 975 }
 976
 977 /*
 978  * _rp   (pa,cs)
 979  */
 980
 981 static adns_status pa_rp(const parseinfo *pai, int cbyte,
 982                          int max, void *datap) {
 983   adns_rr_strpair *rrp= datap;
 984   adns_status st;
 985
 986   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
 987   if (st) return st;
 988
 989   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
 990   if (st) return st;
 991
 992   if (cbyte != max) return adns_s_invaliddata;
 993   return adns_s_ok;
 994 }
 995
 996 static adns_status cs_rp(vbuf *vb, const void *datap) {
 997   const adns_rr_strpair *rrp= datap;
 998   adns_status st;
 999
1000   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
1001   CSP_ADDSTR(" ");
1002   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
1003
1004   return adns_s_ok;
1005 }
1006
1007 /*
1008  * _soa   (pa,mf,cs)
1009  */
1010
1011 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1012                           int max, void *datap) {
1013   adns_rr_soa *rrp= datap;
1014   const byte *dgram= pai->dgram;
1015   adns_status st;
1016   int msw, lsw, i;
1017
1018   st= pap_domain(pai, &cbyte, max, &rrp->mname,
1019                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1020   if (st) return st;
1021
1022   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1023   if (st) return st;
1024
1025   if (cbyte+20 != max) return adns_s_invaliddata;
1026
1027   for (i=0; i<5; i++) {
1028     GET_W(cbyte,msw);
1029     GET_W(cbyte,lsw);
1030     (&rrp->serial)[i]= (msw<<16) | lsw;
1031   }
1032
1033   return adns_s_ok;
1034 }
1035
1036 static void mf_soa(adns_query qu, void *datap) {
1037   adns_rr_soa *rrp= datap;
1038
1039   adns__makefinal_str(qu,&rrp->mname);
1040   adns__makefinal_str(qu,&rrp->rname);
1041 }
1042
1043 static adns_status cs_soa(vbuf *vb, const void *datap) {
1044   const adns_rr_soa *rrp= datap;
1045   char buf[20];
1046   int i;
1047   adns_status st;
1048
1049   st= csp_domain(vb,rrp->mname);  if (st) return st;
1050   CSP_ADDSTR(" ");
1051   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
1052
1053   for (i=0; i<5; i++) {
1054     sprintf(buf," %lu",(&rrp->serial)[i]);
1055     CSP_ADDSTR(buf);
1056   }
1057
1058   return adns_s_ok;
1059 }
1060
1061 /*
1062  * _srv*  (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1063  */
1064
1065 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1066                            union checklabel_state *cls, qcontext *ctx,
1067                            int labnum, const char *label, int lablen) {
1068   if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1069     if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1070     return adns_s_ok;
1071   }
1072   return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1073 }
1074
1075 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1076                                  adns_rr_srvha *rrp
1077                                    /* might be adns_rr_srvraw* */) {
1078   const byte *dgram= pai->dgram;
1079   int ti, cbyte;
1080
1081   cbyte= *cbyte_io;
1082   if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1083
1084   rrp->priority= GET_W(cbyte, ti);
1085   rrp->weight=   GET_W(cbyte, ti);
1086   rrp->port=     GET_W(cbyte, ti);
1087   return adns_s_ok;
1088 }
1089
1090 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1091                              int max, void *datap) {
1092   adns_rr_srvraw *rrp= datap;
1093   adns_status st;
1094
1095   st= pap_srv_begin(pai,&cbyte,max,datap);
1096   if (st) return st;
1097
1098   st= pap_domain(pai, &cbyte, max, &rrp->host,
1099                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1100   if (st) return st;
1101
1102   if (cbyte != max) return adns_s_invaliddata;
1103   return adns_s_ok;
1104 }
1105
1106 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1107                             int max, void *datap) {
1108   adns_rr_srvha *rrp= datap;
1109   adns_status st;
1110
1111   st= pap_srv_begin(pai,&cbyte,max,datap);       if (st) return st;
1112   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);  if (st) return st;
1113   if (cbyte != max) return adns_s_invaliddata;
1114   return adns_s_ok;
1115 }
1116
1117 static void mf_srvraw(adns_query qu, void *datap) {
1118   adns_rr_srvraw *rrp= datap;
1119   adns__makefinal_str(qu, &rrp->host);
1120 }
1121
1122 static void mf_srvha(adns_query qu, void *datap) {
1123   adns_rr_srvha *rrp= datap;
1124   mfp_hostaddr(qu,&rrp->ha);
1125 }
1126
1127 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1128   const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1129     /* might be const adns_rr_svhostaddr* */
1130
1131   if (ap->priority < bp->priority) return 0;
1132   if (ap->priority > bp->priority) return 1;
1133   return 0;
1134 }
1135
1136 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1137                                    /* might be adns_rr_srvraw* */) {
1138   char buf[30];
1139   sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1140   CSP_ADDSTR(buf);
1141   return adns_s_ok;
1142 }
1143
1144 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1145   const adns_rr_srvraw *rrp= datap;
1146   adns_status st;
1147
1148   st= csp_srv_begin(vb,(const void*)rrp);  if (st) return st;
1149   return csp_domain(vb,rrp->host);
1150 }
1151
1152 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1153   const adns_rr_srvha *rrp= datap;
1154   adns_status st;
1155
1156   st= csp_srv_begin(vb,(const void*)datap);  if (st) return st;
1157   return csp_hostaddr(vb,&rrp->ha);
1158 }
1159
1160 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1161                          const struct typeinfo *typei) {
1162   /* we treat everything in the array as if it were an adns_rr_srvha
1163    * even though the array might be of adns_rr_srvraw.  That's OK
1164    * because they have the same prefix, which is all we access.
1165    * We use rrsz, too, rather than naive array indexing, of course.
1166    */
1167   char *workbegin, *workend, *search, *arrayend;
1168   const adns_rr_srvha *rr;
1169   union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1170   int cpriority, totalweight, runtotal;
1171   long randval;
1172
1173   assert(rrsz <= sizeof(rrtmp));
1174   for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1175        workbegin < arrayend;
1176        workbegin= workend) {
1177     cpriority= (rr=(void*)workbegin)->priority;
1178
1179     for (workend= workbegin, totalweight= 0;
1180          workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1181          workend += rrsz) {
1182       totalweight += rr->weight;
1183     }
1184
1185     /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1186      * cpriority.  From now on, workbegin points to the `remaining'
1187      * records: we select one record at a time (RFC2782 `Usage rules'
1188      * and `Format of the SRV RR' subsection `Weight') to place at
1189      * workbegin (swapping with the one that was there, and then
1190      * advance workbegin. */
1191     for (;
1192          workbegin + rrsz < workend; /* don't bother if just one */
1193          workbegin += rrsz) {
1194
1195       randval= nrand48(ads->rand48xsubi);
1196       randval %= (totalweight + 1);
1197         /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1198          * totalweight must be <= 2^26 so probability nonuniformity is
1199          * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1200          *  abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1201          */
1202
1203       for (search=workbegin, runtotal=0;
1204            (runtotal += (rr=(void*)search)->weight) < randval;
1205            search += rrsz);
1206       assert(search < arrayend);
1207       totalweight -= rr->weight;
1208       if (search != workbegin) {
1209         memcpy(&rrtmp, workbegin, rrsz);
1210         memcpy(workbegin, search, rrsz);
1211         memcpy(search, &rrtmp, rrsz);
1212       }
1213     }
1214   }
1215   /* tests:
1216    *  dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1217    *   ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1218    *   ./adnshost_s -t srv- _jabber._tcp.jabber.org
1219    */
1220 }
1221
1222 /*
1223  * _byteblock   (mf)
1224  */
1225
1226 static void mf_byteblock(adns_query qu, void *datap) {
1227   adns_rr_byteblock *rrp= datap;
1228   void *bytes= rrp->data;
1229   adns__makefinal_block(qu,&bytes,rrp->len);
1230   rrp->data= bytes;
1231 }
1232
1233 /*
1234  * _opaque   (pa,cs)
1235  */
1236
1237 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1238                              int max, void *datap) {
1239   adns_rr_byteblock *rrp= datap;
1240
1241   rrp->len= max - cbyte;
1242   rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1243   if (!rrp->data) R_NOMEM;
1244   memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1245   return adns_s_ok;
1246 }
1247
1248 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1249   const adns_rr_byteblock *rrp= datap;
1250   char buf[10];
1251   int l;
1252   unsigned char *p;
1253
1254   sprintf(buf,"\\# %d",rrp->len);
1255   CSP_ADDSTR(buf);
1256
1257   for (l= rrp->len, p= rrp->data;
1258        l>=4;
1259        l -= 4, p += 4) {
1260     sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1261     CSP_ADDSTR(buf);
1262   }
1263   for (;
1264        l>0;
1265        l--, p++) {
1266     sprintf(buf," %02x",*p);
1267     CSP_ADDSTR(buf);
1268   }
1269   return adns_s_ok;
1270 }
1271
1272 /*
1273  * _flat   (mf)
1274  */
1275
1276 static void mf_flat(adns_query qu, void *data) { }
1277
1278 /*
1279  * Now the table.
1280  */
1281
1282 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
1283
1284 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1285  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb,  \
1286      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1287      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1288      CDR(__VA_ARGS__) }
1289 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1290  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat,    \
1291      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1292      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1293      CDR(__VA_ARGS__) }
1294
1295 #define di_0 0
1296
1297 static const typeinfo typeinfos[] = {
1298 /* Must be in ascending order of rrtype ! */
1299 /* mem-mgmt code  rrt     fmt   member   parser      comparer  printer */
1300
1301 FLAT_TYPE(a,      "A",     0,   inaddr,    inaddr,  inaddr,inaddr          ),
1302 DEEP_TYPE(ns_raw, "NS",   "raw",str,       host_raw,0,     domain          ),
1303 DEEP_TYPE(cname,  "CNAME", 0,   str,       dom_raw, 0,     domain          ),
1304 DEEP_TYPE(soa_raw,"SOA",  "raw",soa,       soa,     0,     soa             ),
1305 DEEP_TYPE(ptr_raw,"PTR",  "raw",str,       host_raw,0,     domain          ),
1306 DEEP_TYPE(hinfo,  "HINFO", 0,   intstrpair,hinfo,   0,     hinfo           ),
1307 DEEP_TYPE(mx_raw, "MX",   "raw",intstr,    mx_raw,  mx_raw,inthost         ),
1308 DEEP_TYPE(txt,    "TXT",   0,   manyistr,  txt,     0,     txt             ),
1309 DEEP_TYPE(rp_raw, "RP",   "raw",strpair,   rp,      0,     rp              ),
1310 FLAT_TYPE(aaaa,   "AAAA",  0,   in6addr,   in6addr, in6addr,in6addr        ),
1311 DEEP_TYPE(srv_raw,"SRV",  "raw",srvraw ,   srvraw,  srv,   srvraw,
1312                               .checklabel= ckl_srv, .postsort= postsort_srv),
1313
1314 FLAT_TYPE(addr,   "A",  "addr", addr,      addr,    addr,  addr,
1315                                                          .getrrsz= gsz_addr),
1316 DEEP_TYPE(ns,     "NS", "+addr",hostaddr,  hostaddr,hostaddr,hostaddr      ),
1317 DEEP_TYPE(ptr,    "PTR","checked",str,     ptr,     0,     domain,
1318                                                        .checklabel= ckl_ptr),
1319 DEEP_TYPE(mx,     "MX", "+addr",inthostaddr,mx,     mx,    inthostaddr,    ),
1320 DEEP_TYPE(srv,    "SRV","+addr",srvha,     srvha,   srv,   srvha,
1321                               .checklabel= ckl_srv, .postsort= postsort_srv),
1322
1323 DEEP_TYPE(soa,    "SOA","822",  soa,       soa,     0,     soa             ),
1324 DEEP_TYPE(rp,     "RP", "822",  strpair,   rp,      0,     rp              ),
1325 };
1326
1327 static const typeinfo typeinfo_unknown=
1328 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque,  0,     opaque            );
1329
1330 const typeinfo *adns__findtype(adns_rrtype type) {
1331   const typeinfo *begin, *end, *mid;
1332
1333   if (type & adns_r_unknown) return &typeinfo_unknown;
1334   type &= adns_rrt_reprmask;
1335
1336   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1337
1338   while (begin < end) {
1339     mid= begin + ((end-begin)>>1);
1340     if (mid->typekey == type) return mid;
1341     if (type > mid->typekey) begin= mid+1;
1342     else end= mid;
1343   }
1344   return 0;
1345 }