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 Copyright (C) 1997, 1998 Ian Jackson
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2, or (at your option)
  11  *  any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software Foundation,
  20  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  21  */
  22
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26 #include <arpa/inet.h>
  27
  28 #include "internal.h"
  29
  30 #define R_NOMEM           return adns_s_nomemory
  31 #define CSP_ADDSTR(s)     if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; else;
  32
  33 /*
  34  * order of sections:
  35  *
  36  * _string                    (pap)
  37  * _textdata, _qstring        (csp)
  38  * _str                       (mf,cs)
  39  * _intstr                    (mf,csp,cs)
  40  * _manyistr                  (mf,cs)
  41  * _txt                       (pa)
  42  * _inaddr                    (pa,dip,di)
  43  * _addr                      (pa,di,csp,cs)
  44  * _domain                    (pap)
  45  * _host_raw                  (pa)
  46  * _hostaddr                  (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs)
  47  * _mx_raw                    (pa,di)
  48  * _mx                        (pa,di)
  49  * _inthostaddr               (mf,cs)
  50  * _ptr                       (pa)
  51  * _strpair                   (mf,cs)
  52  * _intstrpair                (mf,cs)
  53  * _hinfo                     (pa)
  54  * _mailbox                   (pap)
  55  * _rp                        (pa)
  56  * _soa                       (pa,mf,cs)
  57  * _flat                      (mf)
  58  *
  59  * within each section:
  60  *    pap_*
  61  *    pa_*
  62  *    dip_*
  63  *    di_*
  64  *    mfp_*
  65  *    mf_*
  66  *    csp_*
  67  *    cs_*
  68  */
  69
  70 /*
  71  * _string               (pap)
  72  * _textdata, _qstring   (csp)
  73  */
  74
  75 static adns_status pap_string(const parseinfo *pai, int *cbyte_io, int max,
  76                               int *len_r, char **str_r) {
  77   /* Neither len_r nor str_r may be null.
  78    * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
  79    */
  80   const byte *dgram= pai->dgram;
  81   int l, cbyte;
  82   char *str;
  83
  84   cbyte= *cbyte_io;
  85
  86   if (cbyte >= max) return adns_s_invaliddata;
  87   GET_B(cbyte,l);
  88   if (cbyte+l > max) return adns_s_invaliddata;
  89
  90   str= adns__alloc_interim(pai->qu, l+1);
  91   if (!str) R_NOMEM;
  92
  93   str[l]= 0;
  94   memcpy(str,dgram+cbyte,l);
  95
  96   *len_r= l;
  97   *str_r= str;
  98   *cbyte_io= cbyte+l;
  99
 100   return adns_s_ok;
 101 }
 102
 103 static adns_status csp_textdata(vbuf *vb, const char *dp, int len) {
 104   unsigned char ch;
 105   char buf[10];
 106   int cn;
 107
 108   CSP_ADDSTR("\"");
 109   for (cn=0; cn<len; cn++) {
 110     ch= *dp++;
 111     if (ch >= 32 && ch <= 126 && ch != '"' && ch != '\\') {
 112       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 113     } else if (ch == '\\') {
 114       CSP_ADDSTR("\\\\");
 115     } else {
 116       sprintf(buf,"\\x%02x",ch);
 117       CSP_ADDSTR(buf);
 118     }
 119   }
 120   CSP_ADDSTR("\"");
 121
 122   return adns_s_ok;
 123 }
 124
 125 static adns_status csp_qstring(vbuf *vb, const char *dp) {
 126   return csp_textdata(vb, dp, strlen(dp));
 127 }
 128
 129 /*
 130  * _str  (mf,cs)
 131  */
 132
 133 static void mf_str(adns_query qu, void *datap) {
 134   char **rrp= datap;
 135
 136   adns__makefinal_str(qu,rrp);
 137 }
 138
 139 static adns_status cs_str(vbuf *vb, const void *datap) {
 140   const char *const *rrp= datap;
 141
 142   return csp_qstring(vb,*rrp);
 143 }
 144
 145 /*
 146  * _intstr  (mf,csp,cs)
 147  */
 148
 149 static void mf_intstr(adns_query qu, void *datap) {
 150   adns_rr_intstr *rrp= datap;
 151
 152   adns__makefinal_str(qu,&rrp->str);
 153 }
 154
 155 static adns_status csp_intstr(vbuf *vb, const adns_rr_intstr *rrp) {
 156   char buf[10];
 157
 158   sprintf(buf,"%u ",rrp->i);
 159   CSP_ADDSTR(buf);
 160   return csp_qstring(vb,rrp->str);
 161 }
 162
 163 static adns_status cs_intstr(vbuf *vb, const void *datap) {
 164   const adns_rr_intstr *rrp= datap;
 165
 166   return csp_intstr(vb,rrp);
 167 }
 168
 169 /*
 170  * _manyistr   (mf,cs)
 171  */
 172
 173 static void mf_manyistr(adns_query qu, void *datap) {
 174   adns_rr_intstr **rrp= datap;
 175   adns_rr_intstr *te, *table;
 176   void *tablev;
 177   int tc;
 178
 179   for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
 180   tablev= *rrp;
 181   adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
 182   *rrp= table= tablev;
 183   for (te= *rrp; te->i >= 0; te++)
 184     adns__makefinal_str(qu,&te->str);
 185 }
 186
 187 static adns_status cs_manyistr(vbuf *vb, const void *datap) {
 188   const adns_rr_intstr *const *rrp= datap;
 189   const adns_rr_intstr *current;
 190   adns_status st;
 191   int spc;
 192
 193   for (spc=0, current= *rrp; current->i >= 0; current++) {
 194     if (spc) CSP_ADDSTR(" ");
 195     st= csp_textdata(vb,current->str,current->i); if (st) return st;
 196   }
 197   return adns_s_ok;
 198 }
 199
 200 /*
 201  * _txt   (pa)
 202  */
 203
 204 static adns_status pa_txt(const parseinfo *pai, int cbyte, int max, void *datap) {
 205   adns_rr_intstr **rrp= datap, *table, *te;
 206   const byte *dgram= pai->dgram;
 207   int ti, tc, l, startbyte;
 208   adns_status st;
 209
 210   startbyte= cbyte;
 211   if (cbyte >= max) return adns_s_invaliddata;
 212   tc= 0;
 213   while (cbyte < max) {
 214     GET_B(cbyte,l);
 215     cbyte+= l;
 216     tc++;
 217   }
 218   if (cbyte != max) return adns_s_invaliddata;
 219
 220   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 221   if (!table) R_NOMEM;
 222
 223   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 224     st= pap_string(pai, &cbyte, max, &te->i, &te->str);
 225     if (st) return st;
 226   }
 227   assert(cbyte == max);
 228
 229   te->i= -1;
 230   te->str= 0;
 231
 232   *rrp= table;
 233   return adns_s_ok;
 234 }
 235
 236 /*
 237  * _inaddr   (pa,dip,di)
 238  */
 239
 240 static adns_status pa_inaddr(const parseinfo *pai, int cbyte, int max, void *datap) {
 241   struct in_addr *storeto= datap;
 242
 243   if (max-cbyte != 4) return adns_s_invaliddata;
 244   memcpy(storeto, pai->dgram + cbyte, 4);
 245   return adns_s_ok;
 246 }
 247
 248 static int search_sortlist(adns_state ads, struct in_addr ad) {
 249   const struct sortlist *slp;
 250   int i;
 251
 252   for (i=0, slp=ads->sortlist;
 253        i<ads->nsortlist && !((ad.s_addr & slp->mask.s_addr) == slp->base.s_addr);
 254        i++, slp++);
 255   return i;
 256 }
 257
 258 static int dip_inaddr(adns_state ads, struct in_addr a, struct in_addr b) {
 259   int ai, bi;
 260
 261   if (!ads->nsortlist) return 0;
 262
 263   ai= search_sortlist(ads,a);
 264   bi= search_sortlist(ads,b);
 265   return bi<ai;
 266 }
 267
 268 static int di_inaddr(adns_state ads, const void *datap_a, const void *datap_b) {
 269   const struct in_addr *ap= datap_a, *bp= datap_b;
 270
 271   return dip_inaddr(ads,*ap,*bp);
 272 }
 273
 274 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 275   const struct in_addr *rrp= datap, rr= *rrp;
 276   const char *ia;
 277
 278   ia= inet_ntoa(rr); assert(ia);
 279   CSP_ADDSTR(ia);
 280   return adns_s_ok;
 281 }
 282
 283 /*
 284  * _addr   (pa,di,csp,cs)
 285  */
 286
 287 static adns_status pa_addr(const parseinfo *pai, int cbyte, int max, void *datap) {
 288   adns_rr_addr *storeto= datap;
 289   const byte *dgram= pai->dgram;
 290
 291   if (max-cbyte != 4) return adns_s_invaliddata;
 292   storeto->len= sizeof(storeto->addr.inet);
 293   memset(&storeto->addr,0,sizeof(storeto->addr.inet));
 294   storeto->addr.inet.sin_family= AF_INET;
 295   memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
 296   return adns_s_ok;
 297 }
 298
 299 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 300   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 301
 302   assert(ap->addr.sa.sa_family == AF_INET);
 303   return dip_inaddr(ads, ap->addr.inet.sin_addr, bp->addr.inet.sin_addr);
 304 }
 305
 306 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 307   const adns_state ads= context;
 308
 309   return di_addr(ads, datap_a, datap_b);
 310 }
 311
 312 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 313   const char *ia;
 314   static char buf[30];
 315
 316   switch (rrp->addr.inet.sin_family) {
 317   case AF_INET:
 318     CSP_ADDSTR("AF_INET ");
 319     ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
 320     CSP_ADDSTR(ia);
 321     break;
 322   default:
 323     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 324     CSP_ADDSTR(buf);
 325     break;
 326   }
 327   return adns_s_ok;
 328 }
 329
 330 static adns_status cs_addr(vbuf *vb, const void *datap) {
 331   const adns_rr_addr *rrp= datap;
 332
 333   return csp_addr(vb,rrp);
 334 }
 335
 336 /*
 337  * _domain  (pap)
 338  */
 339
 340 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 341                               char **domain_r, parsedomain_flags flags) {
 342   adns_status st;
 343   char *dm;
 344
 345   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 346                          pai->dgram,pai->dglen, cbyte_io, max);
 347   if (st) return st;
 348   if (!pai->qu->vb.used) return adns_s_invaliddata;
 349
 350   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 351   if (!dm) R_NOMEM;
 352
 353   dm[pai->qu->vb.used]= 0;
 354   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 355
 356   *domain_r= dm;
 357   return adns_s_ok;
 358 }
 359
 360 /*
 361  * _host_raw   (pa)
 362  */
 363
 364 static adns_status pa_host_raw(const parseinfo *pai, int cbyte, int max, void *datap) {
 365   char **rrp= datap;
 366   adns_status st;
 367
 368   st= pap_domain(pai, &cbyte, max, rrp,
 369                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 370   if (st) return st;
 371
 372   if (cbyte != max) return adns_s_invaliddata;
 373   return adns_s_ok;
 374 }
 375
 376 /*
 377  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs)
 378  */
 379
 380 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 381                                  int *cbyte_io, int count, int dmstart) {
 382   int rri, naddrs;
 383   int type, class, rdlen, rdstart, ownermatched;
 384   adns_status st;
 385
 386   for (rri=0, naddrs=-1; rri<count; rri++) {
 387     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram, pai->dglen, cbyte_io,
 388                             &type, &class, &rdlen, &rdstart,
 389                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 390     if (st) return st;
 391     if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
 392       if (naddrs>0) break; else continue;
 393     }
 394     if (naddrs == -1) {
 395       naddrs= 0;
 396     }
 397     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*sizeof(adns_rr_addr))) R_NOMEM;
 398     st= pa_addr(pai, rdstart,rdstart+rdlen,
 399                 pai->qu->vb.buf + naddrs*sizeof(adns_rr_addr));
 400     if (st) return st;
 401     naddrs++;
 402   }
 403   if (naddrs >= 0) {
 404     ha->addrs= adns__alloc_interim(pai->qu, naddrs*sizeof(adns_rr_addr));
 405     if (!ha->addrs) R_NOMEM;
 406     memcpy(ha->addrs, pai->qu->vb.buf, naddrs*sizeof(adns_rr_addr));
 407     ha->naddrs= naddrs;
 408     ha->astatus= adns_s_ok;
 409
 410     adns__isort(ha->addrs, naddrs, sizeof(adns_rr_addr), pai->qu->vb.buf,
 411                 div_addr, pai->ads);
 412   }
 413   return adns_s_ok;
 414 }
 415
 416 static void icb_hostaddr(adns_query parent, adns_query child) {
 417   adns_answer *cans= child->answer;
 418   adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
 419
 420   rrp->astatus= cans->status;
 421   rrp->naddrs= cans->nrrs;
 422   rrp->addrs= cans->rrs.addr;
 423   adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*sizeof(adns_rr_addr));
 424
 425   if (!parent->children.head) adns__query_done(parent);
 426 }
 427
 428 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 429                                 int max, adns_rr_hostaddr *rrp) {
 430   adns_status st;
 431   int dmstart, cbyte;
 432   qcontext ctx;
 433   int id;
 434   adns_query nqu;
 435
 436   dmstart= cbyte= *cbyte_io;
 437   st= pap_domain(pai, &cbyte, max, &rrp->host,
 438                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 439   if (st) return st;
 440   *cbyte_io= cbyte;
 441
 442   rrp->astatus= adns_s_ok;
 443   rrp->naddrs= -1;
 444   rrp->addrs= 0;
 445
 446   cbyte= pai->nsstart;
 447
 448   st= pap_findaddrs(pai, rrp, &cbyte, pai->nscount, dmstart);
 449   if (st) return st;
 450   if (rrp->naddrs != -1) return adns_s_ok;
 451
 452   st= pap_findaddrs(pai, rrp, &cbyte, pai->arcount, dmstart);
 453   if (st) return st;
 454   if (rrp->naddrs != -1) return adns_s_ok;
 455
 456   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 457                             pai->dgram, pai->dglen, dmstart,
 458                             adns_r_addr, adns_qf_quoteok_query);
 459   if (st) return st;
 460
 461   ctx.ext= 0;
 462   ctx.callback= icb_hostaddr;
 463   ctx.info.hostaddr= rrp;
 464   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 465                             &pai->qu->vb, id,
 466                             adns_qf_quoteok_query, pai->now, 0, &ctx);
 467   if (st) return st;
 468
 469   nqu->parent= pai->qu;
 470   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 471
 472   return adns_s_ok;
 473 }
 474
 475 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte, int max, void *datap) {
 476   adns_rr_hostaddr *rrp= datap;
 477   adns_status st;
 478
 479   st= pap_hostaddr(pai, &cbyte, max, rrp);
 480   if (st) return st;
 481   if (cbyte != max) return adns_s_invaliddata;
 482
 483   return adns_s_ok;
 484 }
 485
 486 static int dip_hostaddr(adns_state ads, const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 487   if (ap->astatus != bp->astatus) return ap->astatus;
 488   if (ap->astatus) return 0;
 489
 490   assert(ap->addrs[0].addr.sa.sa_family == AF_INET);
 491   assert(bp->addrs[0].addr.sa.sa_family == AF_INET);
 492   return dip_inaddr(ads,
 493                     ap->addrs[0].addr.inet.sin_addr,
 494                     bp->addrs[0].addr.inet.sin_addr);
 495 }
 496
 497 static int di_hostaddr(adns_state ads, const void *datap_a, const void *datap_b) {
 498   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 499
 500   return dip_hostaddr(ads, ap,bp);
 501 }
 502
 503 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 504   void *tablev;
 505
 506   adns__makefinal_str(qu,&rrp->host);
 507   tablev= rrp->addrs;
 508   adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs));
 509   rrp->addrs= tablev;
 510 }
 511
 512 static void mf_hostaddr(adns_query qu, void *datap) {
 513   adns_rr_hostaddr *rrp= datap;
 514
 515   mfp_hostaddr(qu,rrp);
 516 }
 517
 518 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 519   const char *to_add;
 520   adns_status st;
 521   int i;
 522
 523   st= csp_qstring(vb,rrp->host); if (st) return st;
 524
 525   if (rrp->astatus) {
 526     CSP_ADDSTR(" - ");
 527     CSP_ADDSTR(adns_strerror(rrp->astatus));
 528   } else {
 529     assert(rrp->naddrs > 0);
 530     for (i=0, to_add= ": "; i<rrp->naddrs; i++, to_add= ", ") {
 531       CSP_ADDSTR(to_add);
 532       st= csp_addr(vb,&rrp->addrs[i]);
 533     }
 534   }
 535   return adns_s_ok;
 536 }
 537
 538 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 539   const adns_rr_hostaddr *rrp= datap;
 540
 541   return csp_hostaddr(vb,rrp);
 542 }
 543
 544 /*
 545  * _mx_raw   (pa,di)
 546  */
 547
 548 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte, int max, void *datap) {
 549   const byte *dgram= pai->dgram;
 550   adns_rr_intstr *rrp= datap;
 551   adns_status st;
 552   int pref;
 553
 554   if (cbyte+2 > max) return adns_s_invaliddata;
 555   GET_W(cbyte,pref);
 556   rrp->i= pref;
 557   st= pap_domain(pai, &cbyte, max, &rrp->str,
 558                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 559   if (st) return st;
 560
 561   if (cbyte != max) return adns_s_invaliddata;
 562   return adns_s_ok;
 563 }
 564
 565 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 566   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 567
 568   if (ap->i < bp->i) return 0;
 569   if (ap->i > bp->i) return 1;
 570   return 0;
 571 }
 572
 573 /*
 574  * _mx   (pa,di)
 575  */
 576
 577 static adns_status pa_mx(const parseinfo *pai, int cbyte, int max, void *datap) {
 578   const byte *dgram= pai->dgram;
 579   adns_rr_inthostaddr *rrp= datap;
 580   adns_status st;
 581   int pref;
 582
 583   if (cbyte+2 > max) return adns_s_invaliddata;
 584   GET_W(cbyte,pref);
 585   rrp->i= pref;
 586   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 587   if (st) return st;
 588
 589   if (cbyte != max) return adns_s_invaliddata;
 590   return adns_s_ok;
 591 }
 592
 593 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
 594   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
 595
 596   if (ap->i < bp->i) return 0;
 597   if (ap->i > bp->i) return 1;
 598   return dip_hostaddr(ads, &ap->ha, &bp->ha);
 599 }
 600
 601 /*
 602  * _inthostaddr  (mf,cs)
 603  */
 604
 605 static void mf_inthostaddr(adns_query qu, void *datap) {
 606   adns_rr_inthostaddr *rrp= datap;
 607
 608   mfp_hostaddr(qu,&rrp->ha);
 609 }
 610
 611 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
 612   const adns_rr_inthostaddr *rrp= datap;
 613   char buf[10];
 614
 615   sprintf(buf,"%u ",rrp->i);
 616   CSP_ADDSTR(buf);
 617
 618   return csp_hostaddr(vb,&rrp->ha);
 619 }
 620
 621 /*
 622  * _ptr   (pa, +icb_ptr)
 623  */
 624
 625 static void icb_ptr(adns_query parent, adns_query child) {
 626   adns_answer *cans= child->answer;
 627   const adns_rr_addr *queried, *found;
 628   int i;
 629
 630   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
 631     adns__query_fail(parent,adns_s_inconsistent);
 632     return;
 633   } else if (cans->status) {
 634     adns__query_fail(parent,cans->status);
 635     return;
 636   }
 637
 638   queried= &parent->ctx.info.ptr_parent_addr;
 639   for (i=0, found=cans->rrs.addr; i<cans->nrrs; i++, found++) {
 640     if (queried->len == found->len &&
 641         !memcmp(&queried->addr,&found->addr,queried->len)) {
 642       if (!parent->children.head) adns__query_done(parent);
 643       return;
 644     }
 645   }
 646
 647   adns__query_fail(parent,adns_s_inconsistent);
 648 }
 649
 650 static adns_status pa_ptr(const parseinfo *pai, int dmstart, int max, void *datap) {
 651   static const char *(expectdomain[])= { DNS_INADDR_ARPA };
 652
 653   char **rrp= datap;
 654   adns_status st;
 655   adns_rr_addr *ap;
 656   findlabel_state fls;
 657   char *ep;
 658   byte ipv[4];
 659   char labbuf[4];
 660   int cbyte, i, lablen, labstart, l, id;
 661   adns_query nqu;
 662   qcontext ctx;
 663
 664   cbyte= dmstart;
 665   st= pap_domain(pai, &cbyte, max, rrp,
 666                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 667   if (st) return st;
 668   if (cbyte != max) return adns_s_invaliddata;
 669
 670   ap= &pai->qu->ctx.info.ptr_parent_addr;
 671   if (!ap->len) {
 672     adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
 673                           pai->qu->query_dgram, pai->qu->query_dglen,
 674                           pai->qu->query_dglen, DNS_HDRSIZE, 0);
 675     for (i=0; i<4; i++) {
 676       st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
 677       if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
 678       memcpy(labbuf, pai->qu->query_dgram + labstart, lablen);  labbuf[lablen]= 0;
 679       ipv[3-i]= strtoul(labbuf,&ep,10);  if (*ep) return adns_s_querydomainwrong;
 680       if (lablen>1 && pai->qu->query_dgram[labstart]=='0')
 681         return adns_s_querydomainwrong;
 682     }
 683     for (i=0; i<sizeof(expectdomain)/sizeof(*expectdomain); i++) {
 684       st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
 685       l= strlen(expectdomain[i]);
 686       if (lablen != l || memcmp(pai->qu->query_dgram + labstart, expectdomain[i], l))
 687         return adns_s_querydomainwrong;
 688     }
 689     st= adns__findlabel_next(&fls,&lablen,0); assert(!st);
 690     if (lablen) return adns_s_querydomainwrong;
 691
 692     ap->len= sizeof(struct sockaddr_in);
 693     memset(&ap->addr,0,sizeof(ap->addr.inet));
 694     ap->addr.inet.sin_family= AF_INET;
 695     ap->addr.inet.sin_addr.s_addr=
 696       htonl((ipv[0]<<24) | (ipv[1]<<16) | (ipv[2]<<8) | (ipv[3]));
 697   }
 698
 699   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 700                             pai->dgram, pai->dglen, dmstart,
 701                             adns_r_addr, adns_qf_quoteok_query);
 702   if (st) return st;
 703
 704   ctx.ext= 0;
 705   ctx.callback= icb_ptr;
 706   memset(&ctx.info,0,sizeof(ctx.info));
 707   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 708                             &pai->qu->vb, id,
 709                             adns_qf_quoteok_query, pai->now, 0, &ctx);
 710   if (st) return st;
 711
 712   nqu->parent= pai->qu;
 713   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 714
 715   return adns_s_ok;
 716 }
 717
 718 /*
 719  * _strpair   (mf,cs)
 720  */
 721
 722 static void mf_strpair(adns_query qu, void *datap) {
 723   adns_rr_strpair *rrp= datap;
 724
 725   adns__makefinal_str(qu,&rrp->array[0]);
 726   adns__makefinal_str(qu,&rrp->array[1]);
 727 }
 728
 729 static adns_status cs_strpair(vbuf *vb, const void *datap) {
 730   const adns_rr_strpair *rrp= datap;
 731   adns_status st;
 732
 733   st= csp_qstring(vb,rrp->array[0]);  if (st) return st;
 734   CSP_ADDSTR(" ");
 735   st= csp_qstring(vb,rrp->array[1]);  if (st) return st;
 736
 737   return adns_s_ok;
 738 }
 739
 740 /*
 741  * _intstrpair   (mf,cs)
 742  */
 743
 744 static void mf_intstrpair(adns_query qu, void *datap) {
 745   adns_rr_intstrpair *rrp= datap;
 746
 747   adns__makefinal_str(qu,&rrp->array[0].str);
 748   adns__makefinal_str(qu,&rrp->array[1].str);
 749 }
 750
 751 static adns_status cs_intstrpair(vbuf *vb, const void *datap) {
 752   const adns_rr_intstrpair *rrp= datap;
 753   adns_status st;
 754
 755   st= csp_intstr(vb,&rrp->array[0]);  if (st) return st;
 756   CSP_ADDSTR(" ");
 757   st= csp_intstr(vb,&rrp->array[1]);  if (st) return st;
 758
 759   return adns_s_ok;
 760 }
 761
 762 /*
 763  * _hinfo   (pa)
 764  */
 765
 766 static adns_status pa_hinfo(const parseinfo *pai, int cbyte, int max, void *datap) {
 767   adns_rr_intstrpair *rrp= datap;
 768   adns_status st;
 769   int i;
 770
 771   for (i=0; i<2; i++) {
 772     st= pap_string(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
 773     if (st) return st;
 774   }
 775
 776   if (cbyte != max) return adns_s_invaliddata;
 777
 778   return adns_s_ok;
 779 }
 780
 781 /*
 782  * _mailbox   (pap)
 783  */
 784
 785 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
 786                                char **mb_r) {
 787   return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
 788   /* fixme: mailbox quoting */
 789 }
 790
 791 /*
 792  * _rp   (pa)
 793  */
 794
 795 static adns_status pa_rp(const parseinfo *pai, int cbyte, int max, void *datap) {
 796   adns_rr_strpair *rrp= datap;
 797   adns_status st;
 798
 799   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
 800   if (st) return st;
 801
 802   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
 803   if (st) return st;
 804
 805   if (cbyte != max) return adns_s_invaliddata;
 806   return adns_s_ok;
 807 }
 808
 809 /*
 810  * _soa   (pa,mf,cs)
 811  */
 812
 813 static adns_status pa_soa(const parseinfo *pai, int cbyte, int max, void *datap) {
 814   adns_rr_soa *rrp= datap;
 815   const byte *dgram= pai->dgram;
 816   adns_status st;
 817   int msw, lsw, i;
 818
 819   st= pap_domain(pai, &cbyte, max, &rrp->mname,
 820                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 821   if (st) return st;
 822
 823   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
 824   if (st) return st;
 825
 826   if (cbyte+20 != max) return adns_s_invaliddata;
 827
 828   for (i=0; i<5; i++) {
 829     GET_W(cbyte,msw);
 830     GET_W(cbyte,lsw);
 831     (&rrp->serial)[i]= (msw<<16) | lsw;
 832   }
 833
 834   return adns_s_ok;
 835 }
 836
 837 static void mf_soa(adns_query qu, void *datap) {
 838   adns_rr_soa *rrp= datap;
 839
 840   adns__makefinal_str(qu,&rrp->mname);
 841   adns__makefinal_str(qu,&rrp->rname);
 842 }
 843
 844 static adns_status cs_soa(vbuf *vb, const void *datap) {
 845   const adns_rr_soa *rrp= datap;
 846   char buf[20];
 847   int i;
 848   adns_status st;
 849
 850   st= csp_qstring(vb,rrp->mname);  if (st) return st;
 851   CSP_ADDSTR(" ");
 852   st= csp_qstring(vb,rrp->rname);  if (st) return st;
 853
 854   for (i=0; i<5; i++) {
 855     sprintf(buf," %lu",(&rrp->serial)[i]);
 856     CSP_ADDSTR(buf);
 857   }
 858
 859   return adns_s_ok;
 860 }
 861
 862 /*
 863  * _flat   (mf)
 864  */
 865
 866 static void mf_flat(adns_query qu, void *data) { }
 867
 868 /*
 869  * Now the table.
 870  */
 871
 872 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
 873
 874 #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb
 875 #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb
 876
 877 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer) \
 878  { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_##memb, cs_##memb, parser, comparer }
 879 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer) \
 880  { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_flat, cs_##memb, parser, comparer }
 881
 882 static const typeinfo typeinfos[] = {
 883 /* Must be in ascending order of rrtype ! */
 884 /* mem-mgmt code     rrt     fmt      member       parser        comparer    */
 885
 886   FLAT_TYPE(a,       "A",     0,      inaddr,      pa_inaddr,    di_inaddr   ),
 887   DEEP_TYPE(ns_raw,  "NS",   "raw",   str,         pa_host_raw,  0           ),
 888   DEEP_TYPE(cname,   "CNAME", 0,      str,         pa_host_raw,  0           ),
 889   DEEP_TYPE(soa_raw, "SOA",  "raw",   soa,         pa_soa,       0           ),
 890   DEEP_TYPE(ptr_raw, "PTR",  "raw",   str,         pa_host_raw,  0           ),
 891   DEEP_TYPE(hinfo,   "HINFO", 0,      intstrpair,  pa_hinfo,     0           ),
 892   DEEP_TYPE(mx_raw,  "MX",   "raw",   intstr,      pa_mx_raw,    di_mx_raw   ),
 893   DEEP_TYPE(txt,     "TXT",   0,      manyistr,    pa_txt,       0           ),
 894   DEEP_TYPE(rp_raw,  "RP",   "raw",   strpair,     pa_rp,        0           ),
 895
 896   FLAT_TYPE(addr,    "A",  "addr",    addr,        pa_addr,      di_addr     ),
 897   DEEP_TYPE(ns,      "NS", "+addr",   hostaddr,    pa_hostaddr,  di_hostaddr ),
 898   DEEP_TYPE(ptr,     "PTR","checked", str,         pa_ptr,       0           ),
 899   DEEP_TYPE(mx,      "MX", "+addr",   inthostaddr, pa_mx,        di_mx       ),
 900
 901   DEEP_TYPE(soa,     "SOA","822",     soa,         pa_soa,       0           ),
 902   DEEP_TYPE(rp,      "RP", "822",     strpair,     pa_rp,        0           ),
 903 };
 904
 905 const typeinfo *adns__findtype(adns_rrtype type) {
 906   const typeinfo *begin, *end, *mid;
 907
 908   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
 909
 910   while (begin < end) {
 911     mid= begin + ((end-begin)>>1);
 912     if (mid->type == type) return mid;
 913     if (type > mid->type) begin= mid+1;
 914     else end= mid;
 915   }
 916   return 0;
 917 }