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
   7  *    Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk>
   8  *
   9  *  It is part of adns, which is
  10  *    Copyright (C) 1997-2000 Ian Jackson <ian@davenant.greenend.org.uk>
  11  *    Copyright (C) 1999-2000 Tony Finch <dot@dotat.at>
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2, or (at your option)
  16  *  any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program; if not, write to the Free Software Foundation,
  25  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  26  */
  27
  28 #include <stdlib.h>
  29
  30 #include <sys/types.h>
  31 #include <sys/socket.h>
  32 #include <netinet/in.h>
  33 #include <arpa/inet.h>
  34
  35 #include "internal.h"
  36
  37 #define R_NOMEM           return adns_s_nomemory
  38 #define CSP_ADDSTR(s)     do { if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; } while (0)
  39
  40 /*
  41  * order of sections:
  42  *
  43  * _string                    (pap)
  44  * _textdata, _qstring        (csp)
  45  * _str                       (mf,cs)
  46  * _intstr                    (mf,csp,cs)
  47  * _manyistr                  (mf,cs)
  48  * _txt                       (pa)
  49  * _inaddr                    (pa,dip,di)
  50  * _addr                      (pa,di,csp,cs)
  51  * _domain                    (pap)
  52  * _host_raw                  (pa)
  53  * _hostaddr                  (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs)
  54  * _mx_raw                    (pa,di)
  55  * _mx                        (pa,di)
  56  * _inthostaddr               (mf,cs)
  57  * _ptr                       (pa)
  58  * _strpair                   (mf,cs)
  59  * _intstrpair                (mf,cs)
  60  * _hinfo                     (pa)
  61  * _mailbox                   (pap +pap_mailbox822)
  62  * _rp                        (pa)
  63  * _soa                       (pa,mf,cs)
  64  * _flat                      (mf)
  65  *
  66  * within each section:
  67  *    pap_*
  68  *    pa_*
  69  *    dip_*
  70  *    di_*
  71  *    mfp_*
  72  *    mf_*
  73  *    csp_*
  74  *    cs_*
  75  */
  76
  77 /*
  78  * _qstring               (pap,csp)
  79  */
  80
  81 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
  82                               int *len_r, char **str_r) {
  83   /* Neither len_r nor str_r may be null.
  84    * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
  85    */
  86   const byte *dgram= pai->dgram;
  87   int l, cbyte;
  88   char *str;
  89
  90   cbyte= *cbyte_io;
  91
  92   if (cbyte >= max) return adns_s_invaliddata;
  93   GET_B(cbyte,l);
  94   if (cbyte+l > max) return adns_s_invaliddata;
  95
  96   str= adns__alloc_interim(pai->qu, l+1);
  97   if (!str) R_NOMEM;
  98
  99   str[l]= 0;
 100   memcpy(str,dgram+cbyte,l);
 101
 102   *len_r= l;
 103   *str_r= str;
 104   *cbyte_io= cbyte+l;
 105
 106   return adns_s_ok;
 107 }
 108
 109 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
 110   unsigned char ch;
 111   char buf[10];
 112   int cn;
 113
 114   CSP_ADDSTR("\"");
 115   for (cn=0; cn<len; cn++) {
 116     ch= *dp++;
 117     if (ch == '\\') {
 118       CSP_ADDSTR("\\\\");
 119     } else if (ch == '"') {
 120       CSP_ADDSTR("\\\"");
 121     } else if (ch >= 32 && ch <= 126) {
 122       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 123     } else {
 124       sprintf(buf,"\\x%02x",ch);
 125       CSP_ADDSTR(buf);
 126     }
 127   }
 128   CSP_ADDSTR("\"");
 129
 130   return adns_s_ok;
 131 }
 132
 133 /*
 134  * _str  (mf)
 135  */
 136
 137 static void mf_str(adns_query qu, void *datap) {
 138   char **rrp= datap;
 139
 140   adns__makefinal_str(qu,rrp);
 141 }
 142
 143 /*
 144  * _intstr  (mf)
 145  */
 146
 147 static void mf_intstr(adns_query qu, void *datap) {
 148   adns_rr_intstr *rrp= datap;
 149
 150   adns__makefinal_str(qu,&rrp->str);
 151 }
 152
 153 /*
 154  * _manyistr   (mf)
 155  */
 156
 157 static void mf_manyistr(adns_query qu, void *datap) {
 158   adns_rr_intstr **rrp= datap;
 159   adns_rr_intstr *te, *table;
 160   void *tablev;
 161   int tc;
 162
 163   for (tc=0, te= *rrp; te->i >= 0; te++, tc++);
 164   tablev= *rrp;
 165   adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1));
 166   *rrp= table= tablev;
 167   for (te= *rrp; te->i >= 0; te++)
 168     adns__makefinal_str(qu,&te->str);
 169 }
 170
 171 /*
 172  * _txt   (pa,cs)
 173  */
 174
 175 static adns_status pa_txt(const parseinfo *pai, int cbyte, int max, void *datap) {
 176   adns_rr_intstr **rrp= datap, *table, *te;
 177   const byte *dgram= pai->dgram;
 178   int ti, tc, l, startbyte;
 179   adns_status st;
 180
 181   startbyte= cbyte;
 182   if (cbyte >= max) return adns_s_invaliddata;
 183   tc= 0;
 184   while (cbyte < max) {
 185     GET_B(cbyte,l);
 186     cbyte+= l;
 187     tc++;
 188   }
 189   if (cbyte != max || !tc) return adns_s_invaliddata;
 190
 191   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 192   if (!table) R_NOMEM;
 193
 194   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 195     st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
 196     if (st) return st;
 197   }
 198   assert(cbyte == max);
 199
 200   te->i= -1;
 201   te->str= 0;
 202
 203   *rrp= table;
 204   return adns_s_ok;
 205 }
 206
 207 static adns_status cs_txt(vbuf *vb, const void *datap) {
 208   const adns_rr_intstr *const *rrp= datap;
 209   const adns_rr_intstr *current;
 210   adns_status st;
 211   int spc;
 212
 213   for (current= *rrp, spc=0;  current->i >= 0;  current++, spc=1) {
 214     if (spc) CSP_ADDSTR(" ");
 215     st= csp_qstring(vb,current->str,current->i); if (st) return st;
 216   }
 217   return adns_s_ok;
 218 }
 219
 220 /*
 221  * _hinfo   (cs)
 222  */
 223
 224 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
 225   const adns_rr_intstrpair *rrp= datap;
 226   adns_status st;
 227
 228   st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i);  if (st) return st;
 229   CSP_ADDSTR(" ");
 230   st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i);  if (st) return st;
 231   return adns_s_ok;
 232 }
 233
 234 /*
 235  * _inaddr   (pa,dip,di)
 236  */
 237
 238 static adns_status pa_inaddr(const parseinfo *pai, int cbyte, int max, void *datap) {
 239   struct in_addr *storeto= datap;
 240
 241   if (max-cbyte != 4) return adns_s_invaliddata;
 242   memcpy(storeto, pai->dgram + cbyte, 4);
 243   return adns_s_ok;
 244 }
 245
 246 static int search_sortlist(adns_state ads, struct in_addr ad) {
 247   const struct sortlist *slp;
 248   int i;
 249
 250   for (i=0, slp=ads->sortlist;
 251        i<ads->nsortlist && !((ad.s_addr & slp->mask.s_addr) == slp->base.s_addr);
 252        i++, slp++);
 253   return i;
 254 }
 255
 256 static int dip_inaddr(adns_state ads, struct in_addr a, struct in_addr b) {
 257   int ai, bi;
 258
 259   if (!ads->nsortlist) return 0;
 260
 261   ai= search_sortlist(ads,a);
 262   bi= search_sortlist(ads,b);
 263   return bi<ai;
 264 }
 265
 266 static int di_inaddr(adns_state ads, const void *datap_a, const void *datap_b) {
 267   const struct in_addr *ap= datap_a, *bp= datap_b;
 268
 269   return dip_inaddr(ads,*ap,*bp);
 270 }
 271
 272 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 273   const struct in_addr *rrp= datap, rr= *rrp;
 274   const char *ia;
 275
 276   ia= inet_ntoa(rr); assert(ia);
 277   CSP_ADDSTR(ia);
 278   return adns_s_ok;
 279 }
 280
 281 /*
 282  * _addr   (pa,di,csp,cs)
 283  */
 284
 285 static adns_status pa_addr(const parseinfo *pai, int cbyte, int max, void *datap) {
 286   adns_rr_addr *storeto= datap;
 287   const byte *dgram= pai->dgram;
 288
 289   if (max-cbyte != 4) return adns_s_invaliddata;
 290   storeto->len= sizeof(storeto->addr.inet);
 291   memset(&storeto->addr,0,sizeof(storeto->addr.inet));
 292   storeto->addr.inet.sin_family= AF_INET;
 293   memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4);
 294   return adns_s_ok;
 295 }
 296
 297 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 298   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 299
 300   assert(ap->addr.sa.sa_family == AF_INET);
 301   return dip_inaddr(ads, ap->addr.inet.sin_addr, bp->addr.inet.sin_addr);
 302 }
 303
 304 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 305   const adns_state ads= context;
 306
 307   return di_addr(ads, datap_a, datap_b);
 308 }
 309
 310 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 311   const char *ia;
 312   static char buf[30];
 313
 314   switch (rrp->addr.inet.sin_family) {
 315   case AF_INET:
 316     CSP_ADDSTR("INET ");
 317     ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia);
 318     CSP_ADDSTR(ia);
 319     break;
 320   default:
 321     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 322     CSP_ADDSTR(buf);
 323     break;
 324   }
 325   return adns_s_ok;
 326 }
 327
 328 static adns_status cs_addr(vbuf *vb, const void *datap) {
 329   const adns_rr_addr *rrp= datap;
 330
 331   return csp_addr(vb,rrp);
 332 }
 333
 334 /*
 335  * _domain      (pap,csp,cs)
 336  * _dom_raw     (pa)
 337  */
 338
 339 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 340                               char **domain_r, parsedomain_flags flags) {
 341   adns_status st;
 342   char *dm;
 343
 344   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 345                          pai->dgram,pai->dglen, cbyte_io, max);
 346   if (st) return st;
 347   if (!pai->qu->vb.used) return adns_s_invaliddata;
 348
 349   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 350   if (!dm) R_NOMEM;
 351
 352   dm[pai->qu->vb.used]= 0;
 353   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 354
 355   *domain_r= dm;
 356   return adns_s_ok;
 357 }
 358
 359 static adns_status csp_domain(vbuf *vb, const char *domain) {
 360   CSP_ADDSTR(domain);
 361   if (!*domain) CSP_ADDSTR(".");
 362   return adns_s_ok;
 363 }
 364
 365 static adns_status cs_domain(vbuf *vb, const void *datap) {
 366   const char *const *domainp= datap;
 367   return csp_domain(vb,*domainp);
 368 }
 369
 370 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte, int max, void *datap) {
 371   char **rrp= datap;
 372   adns_status st;
 373
 374   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 375   if (st) return st;
 376
 377   if (cbyte != max) return adns_s_invaliddata;
 378   return adns_s_ok;
 379 }
 380
 381 /*
 382  * _host_raw   (pa)
 383  */
 384
 385 static adns_status pa_host_raw(const parseinfo *pai, int cbyte, int max, void *datap) {
 386   char **rrp= datap;
 387   adns_status st;
 388
 389   st= pap_domain(pai, &cbyte, max, rrp,
 390                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 391   if (st) return st;
 392
 393   if (cbyte != max) return adns_s_invaliddata;
 394   return adns_s_ok;
 395 }
 396
 397 /*
 398  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs)
 399  */
 400
 401 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 402                                  int *cbyte_io, int count, int dmstart) {
 403   int rri, naddrs;
 404   int type, class, rdlen, rdstart, ownermatched;
 405   unsigned long ttl;
 406   adns_status st;
 407
 408   for (rri=0, naddrs=-1; rri<count; rri++) {
 409     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram, pai->dglen, cbyte_io,
 410                             &type, &class, &ttl, &rdlen, &rdstart,
 411                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 412     if (st) return st;
 413     if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) {
 414       if (naddrs>0) break; else continue;
 415     }
 416     if (naddrs == -1) {
 417       naddrs= 0;
 418     }
 419     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*sizeof(adns_rr_addr))) R_NOMEM;
 420     adns__update_expires(pai->qu,ttl,pai->now);
 421     st= pa_addr(pai, rdstart,rdstart+rdlen,
 422                 pai->qu->vb.buf + naddrs*sizeof(adns_rr_addr));
 423     if (st) return st;
 424     naddrs++;
 425   }
 426   if (naddrs >= 0) {
 427     ha->addrs= adns__alloc_interim(pai->qu, naddrs*sizeof(adns_rr_addr));
 428     if (!ha->addrs) R_NOMEM;
 429     memcpy(ha->addrs, pai->qu->vb.buf, naddrs*sizeof(adns_rr_addr));
 430     ha->naddrs= naddrs;
 431     ha->astatus= adns_s_ok;
 432
 433     adns__isort(ha->addrs, naddrs, sizeof(adns_rr_addr), pai->qu->vb.buf,
 434                 div_addr, pai->ads);
 435   }
 436   return adns_s_ok;
 437 }
 438
 439 static void icb_hostaddr(adns_query parent, adns_query child) {
 440   adns_answer *cans= child->answer;
 441   adns_rr_hostaddr *rrp= child->ctx.info.hostaddr;
 442   adns_state ads= parent->ads;
 443   adns_status st;
 444
 445   st= cans->status;
 446   rrp->astatus= st;
 447   rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs;
 448   rrp->addrs= cans->rrs.addr;
 449   adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*sizeof(adns_rr_addr));
 450
 451   if (parent->children.head) {
 452     LIST_LINK_TAIL(ads->childw,parent);
 453   } else {
 454     adns__query_done(parent);
 455   }
 456 }
 457
 458 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 459                                 int max, adns_rr_hostaddr *rrp) {
 460   adns_status st;
 461   int dmstart, cbyte;
 462   qcontext ctx;
 463   int id;
 464   adns_query nqu;
 465   adns_queryflags nflags;
 466
 467   dmstart= cbyte= *cbyte_io;
 468   st= pap_domain(pai, &cbyte, max, &rrp->host,
 469                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 470   if (st) return st;
 471   *cbyte_io= cbyte;
 472
 473   rrp->astatus= adns_s_ok;
 474   rrp->naddrs= -1;
 475   rrp->addrs= 0;
 476
 477   cbyte= pai->nsstart;
 478
 479   st= pap_findaddrs(pai, rrp, &cbyte, pai->nscount, dmstart);
 480   if (st) return st;
 481   if (rrp->naddrs != -1) return adns_s_ok;
 482
 483   st= pap_findaddrs(pai, rrp, &cbyte, pai->arcount, dmstart);
 484   if (st) return st;
 485   if (rrp->naddrs != -1) return adns_s_ok;
 486
 487   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 488                             pai->dgram, pai->dglen, dmstart,
 489                             adns_r_addr, adns_qf_quoteok_query);
 490   if (st) return st;
 491
 492   ctx.ext= 0;
 493   ctx.callback= icb_hostaddr;
 494   ctx.info.hostaddr= rrp;
 495
 496   nflags= adns_qf_quoteok_query;
 497   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 498
 499   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 500                             &pai->qu->vb, id, nflags, pai->now, &ctx);
 501   if (st) return st;
 502
 503   nqu->parent= pai->qu;
 504   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 505
 506   return adns_s_ok;
 507 }
 508
 509 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte, int max, void *datap) {
 510   adns_rr_hostaddr *rrp= datap;
 511   adns_status st;
 512
 513   st= pap_hostaddr(pai, &cbyte, max, rrp);
 514   if (st) return st;
 515   if (cbyte != max) return adns_s_invaliddata;
 516
 517   return adns_s_ok;
 518 }
 519
 520 static int dip_hostaddr(adns_state ads, const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 521   if (ap->astatus != bp->astatus) return ap->astatus;
 522   if (ap->astatus) return 0;
 523
 524   assert(ap->addrs[0].addr.sa.sa_family == AF_INET);
 525   assert(bp->addrs[0].addr.sa.sa_family == AF_INET);
 526   return dip_inaddr(ads,
 527                     ap->addrs[0].addr.inet.sin_addr,
 528                     bp->addrs[0].addr.inet.sin_addr);
 529 }
 530
 531 static int di_hostaddr(adns_state ads, const void *datap_a, const void *datap_b) {
 532   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 533
 534   return dip_hostaddr(ads, ap,bp);
 535 }
 536
 537 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 538   void *tablev;
 539
 540   adns__makefinal_str(qu,&rrp->host);
 541   tablev= rrp->addrs;
 542   adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs));
 543   rrp->addrs= tablev;
 544 }
 545
 546 static void mf_hostaddr(adns_query qu, void *datap) {
 547   adns_rr_hostaddr *rrp= datap;
 548
 549   mfp_hostaddr(qu,rrp);
 550 }
 551
 552 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 553   const char *errstr;
 554   adns_status st;
 555   char buf[20];
 556   int i;
 557
 558   st= csp_domain(vb,rrp->host);  if (st) return st;
 559
 560   CSP_ADDSTR(" ");
 561   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 562
 563   sprintf(buf," %d ",rrp->astatus);
 564   CSP_ADDSTR(buf);
 565
 566   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 567   CSP_ADDSTR(" ");
 568
 569   errstr= adns_strerror(rrp->astatus);
 570   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 571
 572   if (rrp->naddrs >= 0) {
 573     CSP_ADDSTR(" (");
 574     for (i=0; i<rrp->naddrs; i++) {
 575       CSP_ADDSTR(" ");
 576       st= csp_addr(vb,&rrp->addrs[i]);
 577     }
 578     CSP_ADDSTR(" )");
 579   } else {
 580     CSP_ADDSTR(" ?");
 581   }
 582   return adns_s_ok;
 583 }
 584
 585 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 586   const adns_rr_hostaddr *rrp= datap;
 587
 588   return csp_hostaddr(vb,rrp);
 589 }
 590
 591 /*
 592  * _mx_raw   (pa,di)
 593  */
 594
 595 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte, int max, void *datap) {
 596   const byte *dgram= pai->dgram;
 597   adns_rr_intstr *rrp= datap;
 598   adns_status st;
 599   int pref;
 600
 601   if (cbyte+2 > max) return adns_s_invaliddata;
 602   GET_W(cbyte,pref);
 603   rrp->i= pref;
 604   st= pap_domain(pai, &cbyte, max, &rrp->str,
 605                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 606   if (st) return st;
 607
 608   if (cbyte != max) return adns_s_invaliddata;
 609   return adns_s_ok;
 610 }
 611
 612 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 613   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 614
 615   if (ap->i < bp->i) return 0;
 616   if (ap->i > bp->i) return 1;
 617   return 0;
 618 }
 619
 620 /*
 621  * _mx   (pa,di)
 622  */
 623
 624 static adns_status pa_mx(const parseinfo *pai, int cbyte, int max, void *datap) {
 625   const byte *dgram= pai->dgram;
 626   adns_rr_inthostaddr *rrp= datap;
 627   adns_status st;
 628   int pref;
 629
 630   if (cbyte+2 > max) return adns_s_invaliddata;
 631   GET_W(cbyte,pref);
 632   rrp->i= pref;
 633   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 634   if (st) return st;
 635
 636   if (cbyte != max) return adns_s_invaliddata;
 637   return adns_s_ok;
 638 }
 639
 640 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
 641   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
 642
 643   if (ap->i < bp->i) return 0;
 644   if (ap->i > bp->i) return 1;
 645   return dip_hostaddr(ads, &ap->ha, &bp->ha);
 646 }
 647
 648 /*
 649  * _inthostaddr  (mf,cs)
 650  */
 651
 652 static void mf_inthostaddr(adns_query qu, void *datap) {
 653   adns_rr_inthostaddr *rrp= datap;
 654
 655   mfp_hostaddr(qu,&rrp->ha);
 656 }
 657
 658 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
 659   const adns_rr_inthostaddr *rrp= datap;
 660   char buf[10];
 661
 662   sprintf(buf,"%u ",rrp->i);
 663   CSP_ADDSTR(buf);
 664
 665   return csp_hostaddr(vb,&rrp->ha);
 666 }
 667
 668 /*
 669  * _inthost  (cs)
 670  */
 671
 672 static adns_status cs_inthost(vbuf *vb, const void *datap) {
 673   const adns_rr_intstr *rrp= datap;
 674   char buf[10];
 675
 676   sprintf(buf,"%u ",rrp->i);
 677   CSP_ADDSTR(buf);
 678   return csp_domain(vb,rrp->str);
 679 }
 680
 681 /*
 682  * _ptr   (pa, +icb_ptr)
 683  */
 684
 685 static void icb_ptr(adns_query parent, adns_query child) {
 686   adns_answer *cans= child->answer;
 687   const adns_rr_addr *queried, *found;
 688   adns_state ads= parent->ads;
 689   int i;
 690
 691   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
 692     adns__query_fail(parent,adns_s_inconsistent);
 693     return;
 694   } else if (cans->status) {
 695     adns__query_fail(parent,cans->status);
 696     return;
 697   }
 698
 699   queried= &parent->ctx.info.ptr_parent_addr;
 700   for (i=0, found=cans->rrs.addr; i<cans->nrrs; i++, found++) {
 701     if (queried->len == found->len &&
 702         !memcmp(&queried->addr,&found->addr,queried->len)) {
 703       if (!parent->children.head) {
 704         adns__query_done(parent);
 705         return;
 706       } else {
 707         LIST_LINK_TAIL(ads->childw,parent);
 708         return;
 709       }
 710     }
 711   }
 712
 713   adns__query_fail(parent,adns_s_inconsistent);
 714 }
 715
 716 static adns_status pa_ptr(const parseinfo *pai, int dmstart, int max, void *datap) {
 717   static const char *(expectdomain[])= { DNS_INADDR_ARPA };
 718
 719   char **rrp= datap;
 720   adns_status st;
 721   adns_rr_addr *ap;
 722   findlabel_state fls;
 723   char *ep;
 724   byte ipv[4];
 725   char labbuf[4];
 726   int cbyte, i, lablen, labstart, l, id;
 727   adns_query nqu;
 728   qcontext ctx;
 729
 730   cbyte= dmstart;
 731   st= pap_domain(pai, &cbyte, max, rrp,
 732                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 733   if (st) return st;
 734   if (cbyte != max) return adns_s_invaliddata;
 735
 736   ap= &pai->qu->ctx.info.ptr_parent_addr;
 737   if (!ap->len) {
 738     adns__findlabel_start(&fls, pai->ads, -1, pai->qu,
 739                           pai->qu->query_dgram, pai->qu->query_dglen,
 740                           pai->qu->query_dglen, DNS_HDRSIZE, 0);
 741     for (i=0; i<4; i++) {
 742       st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
 743       if (lablen<=0 || lablen>3) return adns_s_querydomainwrong;
 744       memcpy(labbuf, pai->qu->query_dgram + labstart, lablen);  labbuf[lablen]= 0;
 745       ipv[3-i]= strtoul(labbuf,&ep,10);  if (*ep) return adns_s_querydomainwrong;
 746       if (lablen>1 && pai->qu->query_dgram[labstart]=='0')
 747         return adns_s_querydomainwrong;
 748     }
 749     for (i=0; i<sizeof(expectdomain)/sizeof(*expectdomain); i++) {
 750       st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st);
 751       l= strlen(expectdomain[i]);
 752       if (lablen != l || memcmp(pai->qu->query_dgram + labstart, expectdomain[i], l))
 753         return adns_s_querydomainwrong;
 754     }
 755     st= adns__findlabel_next(&fls,&lablen,0); assert(!st);
 756     if (lablen) return adns_s_querydomainwrong;
 757
 758     ap->len= sizeof(struct sockaddr_in);
 759     memset(&ap->addr,0,sizeof(ap->addr.inet));
 760     ap->addr.inet.sin_family= AF_INET;
 761     ap->addr.inet.sin_addr.s_addr=
 762       htonl((ipv[0]<<24) | (ipv[1]<<16) | (ipv[2]<<8) | (ipv[3]));
 763   }
 764
 765   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 766                             pai->dgram, pai->dglen, dmstart,
 767                             adns_r_addr, adns_qf_quoteok_query);
 768   if (st) return st;
 769
 770   ctx.ext= 0;
 771   ctx.callback= icb_ptr;
 772   memset(&ctx.info,0,sizeof(ctx.info));
 773   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr),
 774                             &pai->qu->vb, id,
 775                             adns_qf_quoteok_query, pai->now, &ctx);
 776   if (st) return st;
 777
 778   nqu->parent= pai->qu;
 779   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
 780   return adns_s_ok;
 781 }
 782
 783 /*
 784  * _strpair   (mf)
 785  */
 786
 787 static void mf_strpair(adns_query qu, void *datap) {
 788   adns_rr_strpair *rrp= datap;
 789
 790   adns__makefinal_str(qu,&rrp->array[0]);
 791   adns__makefinal_str(qu,&rrp->array[1]);
 792 }
 793
 794 /*
 795  * _intstrpair   (mf)
 796  */
 797
 798 static void mf_intstrpair(adns_query qu, void *datap) {
 799   adns_rr_intstrpair *rrp= datap;
 800
 801   adns__makefinal_str(qu,&rrp->array[0].str);
 802   adns__makefinal_str(qu,&rrp->array[1].str);
 803 }
 804
 805 /*
 806  * _hinfo   (pa)
 807  */
 808
 809 static adns_status pa_hinfo(const parseinfo *pai, int cbyte, int max, void *datap) {
 810   adns_rr_intstrpair *rrp= datap;
 811   adns_status st;
 812   int i;
 813
 814   for (i=0; i<2; i++) {
 815     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
 816     if (st) return st;
 817   }
 818
 819   if (cbyte != max) return adns_s_invaliddata;
 820
 821   return adns_s_ok;
 822 }
 823
 824 /*
 825  * _mailbox   (pap,cs)
 826  */
 827
 828 static adns_status pap_mailbox822(const parseinfo *pai, int *cbyte_io, int max,
 829                                   char **mb_r) {
 830   int lablen, labstart, i, needquote, c, r, neednorm;
 831   const unsigned char *p;
 832   char *str;
 833   findlabel_state fls;
 834   adns_status st;
 835   vbuf *vb;
 836
 837   vb= &pai->qu->vb;
 838   vb->used= 0;
 839   adns__findlabel_start(&fls, pai->ads,
 840                         -1, pai->qu,
 841                         pai->dgram, pai->dglen, max,
 842                         *cbyte_io, cbyte_io);
 843   st= adns__findlabel_next(&fls,&lablen,&labstart);
 844   if (!lablen) {
 845     adns__vbuf_appendstr(vb,".");
 846     goto x_ok;
 847   }
 848
 849   neednorm= 1;
 850   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
 851     c= *p++;
 852     if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
 853     if (c == '.' && !neednorm) neednorm= 1;
 854     else if (c==' ' || ctype_822special(c)) needquote++;
 855     else neednorm= 0;
 856   }
 857
 858   if (needquote || neednorm) {
 859     r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
 860     adns__vbuf_appendq(vb,"\"",1);
 861     for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
 862       c= *p;
 863       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
 864       adns__vbuf_appendq(vb,p,1);
 865     }
 866     adns__vbuf_appendq(vb,"\"",1);
 867   } else {
 868     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
 869   }
 870
 871   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
 872
 873   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
 874   if (st) return st;
 875
 876  x_ok:
 877   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
 878   memcpy(str,vb->buf,vb->used);
 879   str[vb->used]= 0;
 880   *mb_r= str;
 881   return adns_s_ok;
 882 }
 883
 884 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
 885                                char **mb_r) {
 886   if (pai->qu->typei->type & adns__qtf_mail822) {
 887     return pap_mailbox822(pai, cbyte_io, max, mb_r);
 888   } else {
 889     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
 890   }
 891 }
 892
 893 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
 894   return csp_domain(vb,mailbox);
 895 }
 896
 897 /*
 898  * _rp   (pa,cs)
 899  */
 900
 901 static adns_status pa_rp(const parseinfo *pai, int cbyte, int max, void *datap) {
 902   adns_rr_strpair *rrp= datap;
 903   adns_status st;
 904
 905   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
 906   if (st) return st;
 907
 908   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
 909   if (st) return st;
 910
 911   if (cbyte != max) return adns_s_invaliddata;
 912   return adns_s_ok;
 913 }
 914
 915 static adns_status cs_rp(vbuf *vb, const void *datap) {
 916   const adns_rr_strpair *rrp= datap;
 917   adns_status st;
 918
 919   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
 920   CSP_ADDSTR(" ");
 921   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
 922
 923   return adns_s_ok;
 924 }
 925
 926 /*
 927  * _soa   (pa,mf,cs)
 928  */
 929
 930 static adns_status pa_soa(const parseinfo *pai, int cbyte, int max, void *datap) {
 931   adns_rr_soa *rrp= datap;
 932   const byte *dgram= pai->dgram;
 933   adns_status st;
 934   int msw, lsw, i;
 935
 936   st= pap_domain(pai, &cbyte, max, &rrp->mname,
 937                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 938   if (st) return st;
 939
 940   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
 941   if (st) return st;
 942
 943   if (cbyte+20 != max) return adns_s_invaliddata;
 944
 945   for (i=0; i<5; i++) {
 946     GET_W(cbyte,msw);
 947     GET_W(cbyte,lsw);
 948     (&rrp->serial)[i]= (msw<<16) | lsw;
 949   }
 950
 951   return adns_s_ok;
 952 }
 953
 954 static void mf_soa(adns_query qu, void *datap) {
 955   adns_rr_soa *rrp= datap;
 956
 957   adns__makefinal_str(qu,&rrp->mname);
 958   adns__makefinal_str(qu,&rrp->rname);
 959 }
 960
 961 static adns_status cs_soa(vbuf *vb, const void *datap) {
 962   const adns_rr_soa *rrp= datap;
 963   char buf[20];
 964   int i;
 965   adns_status st;
 966
 967   st= csp_domain(vb,rrp->mname);  if (st) return st;
 968   CSP_ADDSTR(" ");
 969   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
 970
 971   for (i=0; i<5; i++) {
 972     sprintf(buf," %lu",(&rrp->serial)[i]);
 973     CSP_ADDSTR(buf);
 974   }
 975
 976   return adns_s_ok;
 977 }
 978
 979 /*
 980  * _flat   (mf)
 981  */
 982
 983 static void mf_flat(adns_query qu, void *data) { }
 984
 985 /*
 986  * Now the table.
 987  */
 988
 989 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
 990
 991 #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb
 992 #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb
 993
 994 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
 995  { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_##memb, printer, parser, comparer }
 996 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,printer) \
 997  { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_flat, printer, parser, comparer }
 998
 999 static const typeinfo typeinfos[] = {
1000 /* Must be in ascending order of rrtype ! */
1001 /* mem-mgmt code  rrt     fmt     member      parser      comparer    printer       */
1002
1003 FLAT_TYPE(a,      "A",     0,     inaddr,     pa_inaddr,  di_inaddr,  cs_inaddr     ),
1004 DEEP_TYPE(ns_raw, "NS",   "raw",  str,        pa_host_raw,0,          cs_domain     ),
1005 DEEP_TYPE(cname,  "CNAME", 0,     str,        pa_dom_raw, 0,          cs_domain     ),
1006 DEEP_TYPE(soa_raw,"SOA",  "raw",  soa,        pa_soa,     0,          cs_soa        ),
1007 DEEP_TYPE(ptr_raw,"PTR",  "raw",  str,        pa_host_raw,0,          cs_domain     ),
1008 DEEP_TYPE(hinfo,  "HINFO", 0,     intstrpair, pa_hinfo,   0,          cs_hinfo      ),
1009 DEEP_TYPE(mx_raw, "MX",   "raw",  intstr,     pa_mx_raw,  di_mx_raw,  cs_inthost    ),
1010 DEEP_TYPE(txt,    "TXT",   0,     manyistr,   pa_txt,     0,          cs_txt        ),
1011 DEEP_TYPE(rp_raw, "RP",   "raw",  strpair,    pa_rp,      0,          cs_rp         ),
1012
1013 FLAT_TYPE(addr,   "A",  "addr",   addr,       pa_addr,    di_addr,    cs_addr       ),
1014 DEEP_TYPE(ns,     "NS", "+addr",  hostaddr,   pa_hostaddr,di_hostaddr,cs_hostaddr   ),
1015 DEEP_TYPE(ptr,    "PTR","checked",str,        pa_ptr,     0,          cs_domain     ),
1016 DEEP_TYPE(mx,     "MX", "+addr",  inthostaddr,pa_mx,      di_mx,      cs_inthostaddr),
1017
1018 DEEP_TYPE(soa,    "SOA","822",    soa,        pa_soa,     0,          cs_soa        ),
1019 DEEP_TYPE(rp,     "RP", "822",    strpair,    pa_rp,      0,          cs_rp         ),
1020 };
1021
1022 const typeinfo *adns__findtype(adns_rrtype type) {
1023   const typeinfo *begin, *end, *mid;
1024
1025   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1026
1027   while (begin < end) {
1028     mid= begin + ((end-begin)>>1);
1029     if (mid->type == type) return mid;
1030     if (type > mid->type) begin= mid+1;
1031     else end= mid;
1032   }
1033   return 0;
1034 }