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 <stddef.h>
  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 {                      \
  39     if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \
  40   } while (0)
  41
  42 /*
  43  * order of sections:
  44  *
  45  * _string                    (pap)
  46  * _textdata, _qstring        (csp)
  47  * _str                       (mf,cs)
  48  * _intstr                    (mf,csp,cs)
  49  * _manyistr                  (mf,cs)
  50  * _txt                       (pa)
  51  * _inaddr                    (pa,di,cs
  52  *                              +search_sortlist, dip_genaddr, csp_genaddr)
  53  * _in6addr                   (pa,di,cs)
  54  * _addr                      (pap,pa,di,div,csp,cs,gsz,qs
  55  *                              +search_sortlist_sa, dip_sockaddr,
  56  *                               addr_rrtypes, addr_submit, icb_addr)
  57  * _domain                    (pap,csp,cs)
  58  * _dom_raw                   (pa)
  59  * _host_raw                  (pa)
  60  * _hostaddr                  (pap,pa,dip,di,mfp,mf,csp,cs
  61  *                              +pap_findaddrs, icb_hostaddr)
  62  * _mx_raw                    (pa,di)
  63  * _mx                        (pa,di)
  64  * _inthostaddr               (mf,cs)
  65  * _inthost                   (cs)
  66  * _ptr                       (ckl,pa +icb_ptr)
  67  * _strpair                   (mf)
  68  * _intstrpair                (mf)
  69  * _hinfo                     (pa)
  70  * _mailbox                   (pap,csp +pap_mailbox822)
  71  * _rp                        (pa,cs)
  72  * _soa                       (pa,mf,cs)
  73  * _srv*                      (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
  74  * _byteblock                 (mf)
  75  * _opaque                    (pa,cs)
  76  * _flat                      (mf)
  77  *
  78  * within each section:
  79  *    ckl_*
  80  *    pap_*
  81  *    pa_*
  82  *    dip_*
  83  *    di_*
  84  *    mfp_*
  85  *    mf_*
  86  *    csp_*
  87  *    cs_*
  88  *    gsz_*
  89  *    postsort_*
  90  *    qs_*
  91  */
  92
  93 /*
  94  * _qstring               (pap,csp)
  95  */
  96
  97 static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max,
  98                               int *len_r, char **str_r) {
  99   /* Neither len_r nor str_r may be null.
 100    * End of datagram (overrun) is indicated by returning adns_s_invaliddata;
 101    */
 102   const byte *dgram= pai->dgram;
 103   int l, cbyte;
 104   char *str;
 105
 106   cbyte= *cbyte_io;
 107
 108   if (cbyte >= max) return adns_s_invaliddata;
 109   GET_B(cbyte,l);
 110   if (cbyte+l > max) return adns_s_invaliddata;
 111
 112   str= adns__alloc_interim(pai->qu, l+1);
 113   if (!str) R_NOMEM;
 114
 115   str[l]= 0;
 116   memcpy(str,dgram+cbyte,l);
 117
 118   *len_r= l;
 119   *str_r= str;
 120   *cbyte_io= cbyte+l;
 121
 122   return adns_s_ok;
 123 }
 124
 125 static adns_status csp_qstring(vbuf *vb, const char *dp, int len) {
 126   unsigned char ch;
 127   char buf[10];
 128   int cn;
 129
 130   CSP_ADDSTR("\"");
 131   for (cn=0; cn<len; cn++) {
 132     ch= *dp++;
 133     if (ch == '\\') {
 134       CSP_ADDSTR("\\\\");
 135     } else if (ch == '"') {
 136       CSP_ADDSTR("\\\"");
 137     } else if (ch >= 32 && ch <= 126) {
 138       if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM;
 139     } else {
 140       sprintf(buf,"\\x%02x",ch);
 141       CSP_ADDSTR(buf);
 142     }
 143   }
 144   CSP_ADDSTR("\"");
 145
 146   return adns_s_ok;
 147 }
 148
 149 /*
 150  * _str  (mf)
 151  */
 152
 153 static void mf_str(adns_query qu, void *datap) {
 154   char **rrp= datap;
 155
 156   adns__makefinal_str(qu,rrp);
 157 }
 158
 159 /*
 160  * _intstr  (mf)
 161  */
 162
 163 static void mf_intstr(adns_query qu, void *datap) {
 164   adns_rr_intstr *rrp= datap;
 165
 166   adns__makefinal_str(qu,&rrp->str);
 167 }
 168
 169 /*
 170  * _manyistr   (mf)
 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 /*
 188  * _txt   (pa,cs)
 189  */
 190
 191 static adns_status pa_txt(const parseinfo *pai, int cbyte,
 192                           int max, void *datap) {
 193   adns_rr_intstr **rrp= datap, *table, *te;
 194   const byte *dgram= pai->dgram;
 195   int ti, tc, l, startbyte;
 196   adns_status st;
 197
 198   startbyte= cbyte;
 199   if (cbyte >= max) return adns_s_invaliddata;
 200   tc= 0;
 201   while (cbyte < max) {
 202     GET_B(cbyte,l);
 203     cbyte+= l;
 204     tc++;
 205   }
 206   if (cbyte != max || !tc) return adns_s_invaliddata;
 207
 208   table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1));
 209   if (!table) R_NOMEM;
 210
 211   for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) {
 212     st= pap_qstring(pai, &cbyte, max, &te->i, &te->str);
 213     if (st) return st;
 214   }
 215   assert(cbyte == max);
 216
 217   te->i= -1;
 218   te->str= 0;
 219
 220   *rrp= table;
 221   return adns_s_ok;
 222 }
 223
 224 static adns_status cs_txt(vbuf *vb, const void *datap) {
 225   const adns_rr_intstr *const *rrp= datap;
 226   const adns_rr_intstr *current;
 227   adns_status st;
 228   int spc;
 229
 230   for (current= *rrp, spc=0;  current->i >= 0;  current++, spc=1) {
 231     if (spc) CSP_ADDSTR(" ");
 232     st= csp_qstring(vb,current->str,current->i); if (st) return st;
 233   }
 234   return adns_s_ok;
 235 }
 236
 237 /*
 238  * _hinfo   (cs)
 239  */
 240
 241 static adns_status cs_hinfo(vbuf *vb, const void *datap) {
 242   const adns_rr_intstrpair *rrp= datap;
 243   adns_status st;
 244
 245   st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i);  if (st) return st;
 246   CSP_ADDSTR(" ");
 247   st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i);  if (st) return st;
 248   return adns_s_ok;
 249 }
 250
 251 /*
 252  * _inaddr   (pa,di,cs +search_sortlist, dip_genaddr, csp_genaddr)
 253  */
 254
 255 static adns_status pa_inaddr(const parseinfo *pai, int cbyte,
 256                              int max, void *datap) {
 257   struct in_addr *storeto= datap;
 258
 259   if (max-cbyte != 4) return adns_s_invaliddata;
 260   memcpy(storeto, pai->dgram + cbyte, 4);
 261   return adns_s_ok;
 262 }
 263
 264 static int search_sortlist(adns_state ads, int af, const void *ad) {
 265   const struct sortlist *slp;
 266   const struct in6_addr *a6;
 267   union gen_addr a;
 268   int i;
 269   int v6mappedp= 0;
 270
 271   if (af == AF_INET6) {
 272     a6= ad;
 273     if (IN6_IS_ADDR_V4MAPPED(a6)) {
 274       a.v4.s_addr= htonl(((unsigned long)a6->s6_addr[12] << 24) |
 275                          ((unsigned long)a6->s6_addr[13] << 16) |
 276                          ((unsigned long)a6->s6_addr[14] <<  8) |
 277                          ((unsigned long)a6->s6_addr[15] <<  0));
 278       v6mappedp= 1;
 279     }
 280   }
 281
 282   for (i=0, slp=ads->sortlist;
 283        i<ads->nsortlist &&
 284          !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask) &&
 285          !(v6mappedp &&
 286            adns__addr_match_p(AF_INET,&a, slp->af,&slp->base,&slp->mask));
 287        i++, slp++);
 288   return i;
 289 }
 290
 291 static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) {
 292   int ai, bi;
 293
 294   if (!ads->nsortlist) return 0;
 295
 296   ai= search_sortlist(ads,af,a);
 297   bi= search_sortlist(ads,af,b);
 298   return bi<ai;
 299 }
 300
 301 static int di_inaddr(adns_state ads,
 302                      const void *datap_a, const void *datap_b) {
 303   return dip_genaddr(ads,AF_INET,datap_a,datap_b);
 304 }
 305
 306 static adns_status csp_genaddr(vbuf *vb, int af, const void *p) {
 307   char buf[ADNS_ADDR2TEXT_BUFLEN];
 308   int len= sizeof(buf);
 309   adns_rr_addr a;
 310   int err;
 311
 312   memset(&a, 0, sizeof(a));
 313   a.addr.sa.sa_family= af;
 314   adns__sockaddr_inject(p, 0, &a.addr.sa);
 315   err= adns_addr2text(&a.addr.sa,0, buf,&len, 0); assert(!err);
 316   CSP_ADDSTR(buf);
 317   return adns_s_ok;
 318 }
 319
 320 static adns_status cs_inaddr(vbuf *vb, const void *datap) {
 321   return csp_genaddr(vb, AF_INET,datap);
 322 }
 323
 324 /*
 325  * _in6addr   (pa,di,cs)
 326  */
 327
 328 static adns_status pa_in6addr(const parseinfo *pai, int cbyte,
 329                              int max, void *datap) {
 330   struct in6_addr *storeto= datap;
 331
 332   if (max-cbyte != 16) return adns_s_invaliddata;
 333   memcpy(storeto->s6_addr, pai->dgram + cbyte, 16);
 334   return adns_s_ok;
 335 }
 336
 337 static int di_in6addr(adns_state ads,
 338                      const void *datap_a, const void *datap_b) {
 339   return dip_genaddr(ads,AF_INET6,datap_a,datap_b);
 340 }
 341
 342 static adns_status cs_in6addr(vbuf *vb, const void *datap) {
 343   return csp_genaddr(vb,AF_INET6,datap);
 344 }
 345
 346 /*
 347  * _addr   (pap,pa,di,div,csp,cs,gsz,qs
 348  *              +search_sortlist_sa, dip_sockaddr, addr_rrtypes,
 349  *               addr_submit, icb_addr)
 350  */
 351
 352 static const typeinfo tinfo_addrsub;
 353
 354 #define ADDR_RRTYPES(_) _(a) _(aaaa)
 355
 356 static const adns_rrtype addr_all_rrtypes[] = {
 357 #define RRTY_CODE(ty) adns_r_##ty,
 358   ADDR_RRTYPES(RRTY_CODE)
 359 #undef RRTY_CODE
 360 };
 361
 362 enum {
 363 #define RRTY_INDEX(ty) addr__ri_##ty,
 364   ADDR_RRTYPES(RRTY_INDEX)
 365 #undef RRTY_INDEX
 366   addr_nrrtypes,
 367 #define RRTY_FLAG(ty) addr_rf_##ty = 1 << addr__ri_##ty,
 368   ADDR_RRTYPES(RRTY_FLAG)
 369   addr__rrty_hunoz
 370 #undef RRTY_FLAG
 371 };
 372
 373 static unsigned addr_rrtypeflag(adns_rrtype type) {
 374   int i;
 375
 376   type &= adns_rrt_typemask;
 377   for (i=0; i<addr_nrrtypes && type!=addr_all_rrtypes[i]; i++);
 378   return i < addr_nrrtypes ? 1 << i : 0;
 379 }
 380
 381 static adns_status pap_addr(const parseinfo *pai, int rrty, size_t rrsz,
 382                             int *cbyte_io, int max, adns_rr_addr *storeto) {
 383   const byte *dgram= pai->dgram;
 384   int af, addrlen, salen;
 385   const void *oaddr= dgram + *cbyte_io;
 386   int avail= max - *cbyte_io;
 387   int step= -1;
 388   void *addrp= 0;
 389
 390   switch (rrty) {
 391   case adns_r_a:
 392     af= AF_INET; addrlen= 4;
 393     addrp= &storeto->addr.inet.sin_addr;
 394     salen= sizeof(storeto->addr.inet);
 395     break;
 396   }
 397   assert(addrp);
 398
 399   assert(offsetof(adns_rr_addr, addr) + salen <= rrsz);
 400   if (addrlen < avail) return adns_s_invaliddata;
 401   if (step < 0) step= addrlen;
 402   *cbyte_io += step;
 403   memset(&storeto->addr, 0, salen);
 404   storeto->len= salen;
 405   storeto->addr.sa.sa_family= af;
 406   memcpy(addrp, oaddr, addrlen);
 407
 408   return adns_s_ok;
 409 }
 410
 411 static adns_status pa_addr(const parseinfo *pai, int cbyte,
 412                            int max, void *datap) {
 413   int err= pap_addr(pai, pai->qu->answer->type & adns_rrt_typemask,
 414                     pai->qu->answer->rrsz, &cbyte, max, datap);
 415   if (err) return err;
 416   if (cbyte != max) return adns_s_invaliddata;
 417   return adns_s_ok;
 418 }
 419
 420 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
 421   union gen_addr a;
 422   adns__sockaddr_extract(sa, &a, 0);
 423   return search_sortlist(ads, sa->sa_family, &a);
 424 }
 425
 426 static int dip_sockaddr(adns_state ads,
 427                         const struct sockaddr *sa,
 428                         const struct sockaddr *sb) {
 429   if (!ads->sortlist) return 0;
 430   return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
 431 }
 432
 433 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 434   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 435   return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
 436 }
 437
 438 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 439   const adns_state ads= context;
 440
 441   return di_addr(ads, datap_a, datap_b);
 442 }
 443
 444 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 445   char buf[ADNS_ADDR2TEXT_BUFLEN];
 446   int len= sizeof(buf);
 447   int err;
 448
 449   switch (rrp->addr.inet.sin_family) {
 450   case AF_INET:
 451     CSP_ADDSTR("INET ");
 452     goto a2t;
 453   case AF_INET6:
 454     CSP_ADDSTR("INET6 ");
 455     goto a2t;
 456   a2t:
 457     err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
 458     CSP_ADDSTR(buf);
 459     break;
 460   default:
 461     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 462     CSP_ADDSTR(buf);
 463     break;
 464   }
 465   return adns_s_ok;
 466 }
 467
 468 static adns_status cs_addr(vbuf *vb, const void *datap) {
 469   const adns_rr_addr *rrp= datap;
 470
 471   return csp_addr(vb,rrp);
 472 }
 473
 474 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
 475   return type & adns__qtf_bigaddr ?
 476     sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
 477 }
 478
 479 static unsigned addr_rrtypes(adns_state ads, adns_rrtype type,
 480                              adns_queryflags qf) {
 481   /* Return a mask of addr_rf_... flags indicating which address families are
 482    * wanted, given a query type and flags.
 483    */
 484   return addr_rf_a;
 485 }
 486
 487 static void icb_addr(adns_query parent, adns_query child);
 488
 489 static void addr_subqueries(adns_query qu, struct timeval now,
 490                             adns_queryflags qf_extra,
 491                             const byte *qd_dgram, int qd_dglen) {
 492   int i, err, id;
 493   adns_query cqu;
 494   adns_queryflags qf= (qu->flags & ~adns_qf_search) | qf_extra;
 495   adns_rrtype qtf= qu->answer->type & adns__qtf_deref;
 496   unsigned which= qu->ctx.tinfo.addr.want & ~qu->ctx.tinfo.addr.have;
 497   qcontext ctx;
 498
 499   memset(&ctx, 0, sizeof(ctx));
 500   ctx.callback= icb_addr;
 501   for (i=0; i<addr_nrrtypes; i++) {
 502     if (!(which & (1 << i))) continue;
 503     err= adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qd_dgram,qd_dglen,
 504                                DNS_HDRSIZE, addr_all_rrtypes[i], qf);
 505     if (err) goto x_error;
 506     err= adns__internal_submit(qu->ads, &cqu, qu, &tinfo_addrsub,
 507                                addr_all_rrtypes[i] | qtf,
 508                                &qu->vb, id, qf, now, &ctx);
 509     if (err) goto x_error;
 510     cqu->answer->rrsz= qu->answer->rrsz;
 511   }
 512   qu->state= query_childw;
 513   LIST_LINK_TAIL(qu->ads->childw, qu);
 514   return;
 515
 516 x_error:
 517   adns__query_fail(qu, err);
 518 }
 519
 520 static adns_status addr_submit(adns_query parent, adns_query *query_r,
 521                                vbuf *qumsg_vb, int id, unsigned want,
 522                                adns_queryflags flags, struct timeval now,
 523                                qcontext *ctx) {
 524   /* This is effectively a substitute for adns__internal_submit, intended for
 525    * the case where the caller (possibly) only wants a subset of the
 526    * available record types.  The memory management and callback rules are
 527    * the same as for adns__internal_submit.
 528    *
 529    * Some differences: the query is linked onto the parent's children list
 530    * before exit (though the parent's state is not changed, and it is not
 531    * linked into the childw list queue); and we fiddle with the `tinfo'
 532    * portion of the context structure (yes, modifying *ctx), since this is,
 533    * in fact, the main purpose of this function.
 534    */
 535
 536   adns_state ads= parent->ads;
 537   adns_query qu;
 538   adns_status err;
 539   adns_rrtype type= ((adns_r_addr & adns_rrt_reprmask) |
 540                      (parent->answer->type & ~adns_rrt_reprmask));
 541
 542   ctx->tinfo.addr.want= want;
 543   ctx->tinfo.addr.have= 0;
 544   err= adns__internal_submit(ads, &qu, parent, adns__findtype(adns_r_addr),
 545                              type, qumsg_vb, id, flags, now, ctx);
 546   if (err) return err;
 547
 548   *query_r= qu;
 549   return adns_s_ok;
 550 }
 551
 552 static adns_status append_addrs(adns_query qu, size_t rrsz,
 553                                 adns_rr_addr **dp, int *dlen,
 554                                 const adns_rr_addr *sp, int slen) {
 555   /* Append a vector of slen addr records, each of size rrsz, starting at ap,
 556    * to a vector starting at *dp, of length *dlen.  On successful completion,
 557    * *dp and *dlen are updated.
 558    */
 559
 560   size_t drrsz= *dlen*rrsz, srrsz= slen*rrsz;
 561   byte *p;
 562
 563   if (!slen) return adns_s_ok;
 564   p= adns__alloc_interim(qu, drrsz + srrsz);
 565   if (!p) R_NOMEM;
 566   if (*dlen) {
 567     memcpy(p, *dp, drrsz);
 568     adns__free_interim(qu, *dp);
 569   }
 570   memcpy(p + drrsz, sp, srrsz);
 571   *dlen += slen;
 572   *dp= (adns_rr_addr *)p;
 573   return adns_s_ok;
 574 }
 575
 576 static void propagate_ttl(adns_query to, adns_query from)
 577   { if (to->expires > from->expires) to->expires= from->expires; }
 578
 579 static adns_status copy_cname_from_child(adns_query parent, adns_query child) {
 580   adns_answer *pans= parent->answer, *cans= child->answer;
 581   size_t n= strlen(cans->cname) + 1;
 582
 583   pans->cname= adns__alloc_preserved(parent, n);
 584   if (!pans->cname) R_NOMEM;
 585   memcpy(pans->cname, cans->cname, n);
 586   return adns_s_ok;
 587 }
 588
 589 static void done_addr_type(adns_query qu, adns_rrtype type) {
 590   unsigned f= addr_rrtypeflag(type);
 591   assert(f); qu->ctx.tinfo.addr.have |= f;
 592 }
 593
 594 static void icb_addr(adns_query parent, adns_query child) {
 595   adns_state ads= parent->ads;
 596   adns_answer *pans= parent->answer, *cans= child->answer;
 597   struct timeval now;
 598   adns_status err;
 599
 600   propagate_ttl(parent, child);
 601
 602   if (cans->cname && !pans->cname) {
 603     err= copy_cname_from_child(parent, child);
 604     if (err) goto x_err;
 605   }
 606
 607   if ((parent->flags & adns_qf_search) &&
 608       !pans->cname && cans->status == adns_s_nxdomain) {
 609     /* We're searching a list of suffixes, and the name doesn't exist.  Try
 610      * the next one.
 611      */
 612
 613     adns__cancel_children(parent);
 614     adns__free_interim(parent, pans->rrs.bytes);
 615     pans->rrs.bytes= 0; pans->nrrs= 0;
 616     if (gettimeofday(&now, 0)) goto x_gtod;
 617     adns__search_next(ads, parent, now);
 618     return;
 619   }
 620
 621   if (cans->status && cans->status != adns_s_nodata)
 622     { err= cans->status; goto x_err; }
 623
 624   assert(pans->rrsz == cans->rrsz);
 625   err= append_addrs(parent, pans->rrsz,
 626                     &pans->rrs.addr, &pans->nrrs,
 627                     cans->rrs.addr, cans->nrrs);
 628   if (err) goto x_err;
 629   done_addr_type(parent, cans->type);
 630
 631   if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
 632   else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
 633   else adns__query_done(parent);
 634   return;
 635
 636 x_gtod:
 637   adns__diag(ads, -1, parent, "gettimeofday failed: %s", strerror(errno));
 638   err= adns_s_systemfail;
 639   goto x_err;
 640
 641 x_err:
 642   adns__query_fail(parent, err);
 643 }
 644
 645 static void qs_addr(adns_query qu, struct timeval now) {
 646   if (!qu->ctx.tinfo.addr.want) {
 647     qu->ctx.tinfo.addr.want= addr_rrtypes(qu->ads, qu->answer->type,
 648                                           qu->flags);
 649     qu->ctx.tinfo.addr.have= 0;
 650   }
 651   addr_subqueries(qu, now, 0, qu->query_dgram, qu->query_dglen);
 652 }
 653
 654 /*
 655  * _domain      (pap,csp,cs)
 656  * _dom_raw     (pa)
 657  */
 658
 659 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 660                               char **domain_r, parsedomain_flags flags) {
 661   adns_status st;
 662   char *dm;
 663
 664   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 665                          pai->dgram,pai->dglen, cbyte_io, max);
 666   if (st) return st;
 667   if (!pai->qu->vb.used) return adns_s_invaliddata;
 668
 669   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 670   if (!dm) R_NOMEM;
 671
 672   dm[pai->qu->vb.used]= 0;
 673   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 674
 675   *domain_r= dm;
 676   return adns_s_ok;
 677 }
 678
 679 static adns_status csp_domain(vbuf *vb, const char *domain) {
 680   CSP_ADDSTR(domain);
 681   if (!*domain) CSP_ADDSTR(".");
 682   return adns_s_ok;
 683 }
 684
 685 static adns_status cs_domain(vbuf *vb, const void *datap) {
 686   const char *const *domainp= datap;
 687   return csp_domain(vb,*domainp);
 688 }
 689
 690 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
 691                               int max, void *datap) {
 692   char **rrp= datap;
 693   adns_status st;
 694
 695   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 696   if (st) return st;
 697
 698   if (cbyte != max) return adns_s_invaliddata;
 699   return adns_s_ok;
 700 }
 701
 702 /*
 703  * _host_raw   (pa)
 704  */
 705
 706 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
 707                                int max, void *datap) {
 708   char **rrp= datap;
 709   adns_status st;
 710
 711   st= pap_domain(pai, &cbyte, max, rrp,
 712                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 713   if (st) return st;
 714
 715   if (cbyte != max) return adns_s_invaliddata;
 716   return adns_s_ok;
 717 }
 718
 719 /*
 720  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
 721  */
 722
 723 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 724                                  unsigned *want_io, size_t addrsz,
 725                                  int *cbyte_io, int count, int dmstart) {
 726   int rri, naddrs;
 727   unsigned typef, want= *want_io, need= want;
 728   int type, class, rdlen, rdend, rdstart, ownermatched;
 729   unsigned long ttl;
 730   adns_status st;
 731
 732   for (rri=0, naddrs=0; rri<count; rri++) {
 733     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
 734                             pai->dglen, cbyte_io,
 735                             &type, &class, &ttl, &rdlen, &rdstart,
 736                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 737     if (st) return st;
 738     if (!ownermatched || class != DNS_CLASS_IN) continue;
 739     typef= addr_rrtypeflag(type);
 740     if (!(want & typef)) continue;
 741     need &= ~typef;
 742     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) R_NOMEM;
 743     adns__update_expires(pai->qu,ttl,pai->now);
 744     rdend= rdstart + rdlen;
 745     st= pap_addr(pai, type, addrsz, &rdstart, rdend,
 746                  (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
 747     if (st) return st;
 748     if (rdstart != rdend) return adns_s_invaliddata;
 749     naddrs++;
 750   }
 751   if (naddrs > 0) {
 752     st= append_addrs(pai->qu, addrsz, &ha->addrs, &ha->naddrs,
 753                      (const adns_rr_addr *)pai->qu->vb.buf, naddrs);
 754     if (st) return st;
 755     ha->astatus= adns_s_ok;
 756
 757     if (!need) {
 758       adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
 759                   div_addr, pai->ads);
 760     }
 761   }
 762   *want_io= need;
 763   return adns_s_ok;
 764 }
 765
 766 static void icb_hostaddr(adns_query parent, adns_query child) {
 767   adns_answer *cans= child->answer;
 768   adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
 769   adns_state ads= parent->ads;
 770   adns_status st;
 771   size_t addrsz= gsz_addr(0, parent->answer->type);
 772
 773   st= cans->status == adns_s_nodata ? adns_s_ok : cans->status;
 774   if (st) goto done;
 775   propagate_ttl(parent, child);
 776
 777   assert(addrsz == cans->rrsz);
 778   st= append_addrs(parent, addrsz,
 779                    &rrp->addrs, &rrp->naddrs,
 780                    cans->rrs.addr, cans->nrrs);
 781   if (st) goto done;
 782   if (!rrp->naddrs) { st= adns_s_nodata; goto done; }
 783
 784   if (!adns__vbuf_ensure(&parent->vb, addrsz))
 785     { st= adns_s_nomemory; goto done; }
 786   adns__isort(rrp->addrs, rrp->naddrs, addrsz, parent->vb.buf,
 787               div_addr, ads);
 788
 789 done:
 790   if (st) {
 791     adns__free_interim(parent, rrp->addrs);
 792     rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : 0;
 793   }
 794
 795   rrp->astatus= st;
 796   if (parent->children.head) {
 797     LIST_LINK_TAIL(ads->childw,parent);
 798   } else {
 799     adns__query_done(parent);
 800   }
 801 }
 802
 803 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 804                                 int max, adns_rr_hostaddr *rrp) {
 805   adns_status st;
 806   int dmstart, cbyte;
 807   qcontext ctx;
 808   int id;
 809   adns_query nqu;
 810   adns_queryflags nflags;
 811   unsigned want;
 812   size_t addrsz= gsz_addr(0, pai->qu->answer->type);
 813
 814   dmstart= cbyte= *cbyte_io;
 815   st= pap_domain(pai, &cbyte, max, &rrp->host,
 816                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 817   if (st) return st;
 818   *cbyte_io= cbyte;
 819
 820   rrp->astatus= adns_s_ok;
 821   rrp->naddrs= 0;
 822   rrp->addrs= 0;
 823
 824   cbyte= pai->nsstart;
 825
 826   want= addr_rrtypes(pai->ads, pai->qu->answer->type, pai->qu->flags);
 827
 828   st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->nscount, dmstart);
 829   if (st) return st;
 830   if (!want) return adns_s_ok;
 831
 832   st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->arcount, dmstart);
 833   if (st) return st;
 834   if (!want) return adns_s_ok;
 835
 836   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 837                             pai->dgram, pai->dglen, dmstart,
 838                             adns_r_addr, adns_qf_quoteok_query);
 839   if (st) return st;
 840
 841   ctx.ext= 0;
 842   ctx.callback= icb_hostaddr;
 843   ctx.pinfo.hostaddr= rrp;
 844
 845   nflags= adns_qf_quoteok_query;
 846   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 847
 848   st= addr_submit(pai->qu, &nqu, &pai->qu->vb, id, want,
 849                   nflags, pai->now, &ctx);
 850   if (st) return st;
 851
 852   return adns_s_ok;
 853 }
 854
 855 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
 856                                int max, void *datap) {
 857   adns_rr_hostaddr *rrp= datap;
 858   adns_status st;
 859
 860   st= pap_hostaddr(pai, &cbyte, max, rrp);
 861   if (st) return st;
 862   if (cbyte != max) return adns_s_invaliddata;
 863
 864   return adns_s_ok;
 865 }
 866
 867 static int dip_hostaddr(adns_state ads,
 868                         const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 869   if (ap->astatus != bp->astatus) return ap->astatus;
 870   if (ap->astatus) return 0;
 871
 872   return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
 873 }
 874
 875 static int di_hostaddr(adns_state ads,
 876                        const void *datap_a, const void *datap_b) {
 877   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 878
 879   return dip_hostaddr(ads, ap,bp);
 880 }
 881
 882 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 883   void *tablev;
 884   size_t addrsz= gsz_addr(0, qu->answer->type);
 885
 886   adns__makefinal_str(qu,&rrp->host);
 887   tablev= rrp->addrs;
 888   adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
 889   rrp->addrs= tablev;
 890 }
 891
 892 static void mf_hostaddr(adns_query qu, void *datap) {
 893   adns_rr_hostaddr *rrp= datap;
 894
 895   mfp_hostaddr(qu,rrp);
 896 }
 897
 898 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 899   const char *errstr;
 900   adns_status st;
 901   char buf[20];
 902   int i;
 903
 904   st= csp_domain(vb,rrp->host);  if (st) return st;
 905
 906   CSP_ADDSTR(" ");
 907   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 908
 909   sprintf(buf," %d ",rrp->astatus);
 910   CSP_ADDSTR(buf);
 911
 912   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 913   CSP_ADDSTR(" ");
 914
 915   errstr= adns_strerror(rrp->astatus);
 916   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 917
 918   if (rrp->naddrs >= 0) {
 919     CSP_ADDSTR(" (");
 920     for (i=0; i<rrp->naddrs; i++) {
 921       CSP_ADDSTR(" ");
 922       st= csp_addr(vb,&rrp->addrs[i]);
 923     }
 924     CSP_ADDSTR(" )");
 925   } else {
 926     CSP_ADDSTR(" ?");
 927   }
 928   return adns_s_ok;
 929 }
 930
 931 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 932   const adns_rr_hostaddr *rrp= datap;
 933
 934   return csp_hostaddr(vb,rrp);
 935 }
 936
 937 /*
 938  * _mx_raw   (pa,di)
 939  */
 940
 941 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
 942                              int max, void *datap) {
 943   const byte *dgram= pai->dgram;
 944   adns_rr_intstr *rrp= datap;
 945   adns_status st;
 946   int pref;
 947
 948   if (cbyte+2 > max) return adns_s_invaliddata;
 949   GET_W(cbyte,pref);
 950   rrp->i= pref;
 951   st= pap_domain(pai, &cbyte, max, &rrp->str,
 952                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 953   if (st) return st;
 954
 955   if (cbyte != max) return adns_s_invaliddata;
 956   return adns_s_ok;
 957 }
 958
 959 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 960   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 961
 962   if (ap->i < bp->i) return 0;
 963   if (ap->i > bp->i) return 1;
 964   return 0;
 965 }
 966
 967 /*
 968  * _mx   (pa,di)
 969  */
 970
 971 static adns_status pa_mx(const parseinfo *pai, int cbyte,
 972                          int max, void *datap) {
 973   const byte *dgram= pai->dgram;
 974   adns_rr_inthostaddr *rrp= datap;
 975   adns_status st;
 976   int pref;
 977
 978   if (cbyte+2 > max) return adns_s_invaliddata;
 979   GET_W(cbyte,pref);
 980   rrp->i= pref;
 981   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
 982   if (st) return st;
 983
 984   if (cbyte != max) return adns_s_invaliddata;
 985   return adns_s_ok;
 986 }
 987
 988 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
 989   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
 990
 991   if (ap->i < bp->i) return 0;
 992   if (ap->i > bp->i) return 1;
 993   return dip_hostaddr(ads, &ap->ha, &bp->ha);
 994 }
 995
 996 /*
 997  * _inthostaddr  (mf,cs)
 998  */
 999
1000 static void mf_inthostaddr(adns_query qu, void *datap) {
1001   adns_rr_inthostaddr *rrp= datap;
1002
1003   mfp_hostaddr(qu,&rrp->ha);
1004 }
1005
1006 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
1007   const adns_rr_inthostaddr *rrp= datap;
1008   char buf[10];
1009
1010   sprintf(buf,"%u ",rrp->i);
1011   CSP_ADDSTR(buf);
1012
1013   return csp_hostaddr(vb,&rrp->ha);
1014 }
1015
1016 /*
1017  * _inthost  (cs)
1018  */
1019
1020 static adns_status cs_inthost(vbuf *vb, const void *datap) {
1021   const adns_rr_intstr *rrp= datap;
1022   char buf[10];
1023
1024   sprintf(buf,"%u ",rrp->i);
1025   CSP_ADDSTR(buf);
1026   return csp_domain(vb,rrp->str);
1027 }
1028
1029 /*
1030  * _ptr   (ckl,pa +icb_ptr)
1031  */
1032
1033 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
1034                            union checklabel_state *cls, qcontext *ctx,
1035                            int labnum, const char *label, int lablen) {
1036   if (lablen) {
1037     if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
1038       return adns_s_querydomainwrong;
1039   } else {
1040     if (adns__revparse_done(&cls->ptr, labnum,
1041                             &ctx->tinfo.ptr.rev_rrtype,
1042                             &ctx->tinfo.ptr.addr))
1043       return adns_s_querydomainwrong;
1044   }
1045   return adns_s_ok;
1046 }
1047
1048 static void icb_ptr(adns_query parent, adns_query child) {
1049   adns_answer *cans= child->answer;
1050   const struct af_addr *queried;
1051   const unsigned char *found;
1052   adns_state ads= parent->ads;
1053   int i;
1054
1055   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1056     adns__query_fail(parent,adns_s_inconsistent);
1057     return;
1058   } else if (cans->status) {
1059     adns__query_fail(parent,cans->status);
1060     return;
1061   }
1062
1063   queried= &parent->ctx.tinfo.ptr.addr;
1064   for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
1065     if (adns__genaddr_equal_p(queried->af,&queried->addr,
1066                               parent->ctx.tinfo.ptr.addr.af,found)) {
1067       if (!parent->children.head) {
1068         adns__query_done(parent);
1069         return;
1070       } else {
1071         LIST_LINK_TAIL(ads->childw,parent);
1072         return;
1073       }
1074     }
1075   }
1076
1077   adns__query_fail(parent,adns_s_inconsistent);
1078 }
1079
1080 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1081                           int max, void *datap) {
1082   char **rrp= datap;
1083   adns_status st;
1084   adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
1085   int cbyte, id;
1086   adns_query nqu;
1087   qcontext ctx;
1088
1089   cbyte= dmstart;
1090   st= pap_domain(pai, &cbyte, max, rrp,
1091                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1092   if (st) return st;
1093   if (cbyte != max) return adns_s_invaliddata;
1094
1095   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1096                             pai->dgram, pai->dglen, dmstart,
1097                             rrtype, adns_qf_quoteok_query);
1098   if (st) return st;
1099
1100   ctx.ext= 0;
1101   ctx.callback= icb_ptr;
1102   memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
1103   memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
1104   st= adns__internal_submit(pai->ads, &nqu, pai->qu,
1105                             adns__findtype(rrtype),
1106                             rrtype, &pai->qu->vb, id,
1107                             adns_qf_quoteok_query, pai->now, &ctx);
1108   if (st) return st;
1109
1110   return adns_s_ok;
1111 }
1112
1113 /*
1114  * _strpair   (mf)
1115  */
1116
1117 static void mf_strpair(adns_query qu, void *datap) {
1118   adns_rr_strpair *rrp= datap;
1119
1120   adns__makefinal_str(qu,&rrp->array[0]);
1121   adns__makefinal_str(qu,&rrp->array[1]);
1122 }
1123
1124 /*
1125  * _intstrpair   (mf)
1126  */
1127
1128 static void mf_intstrpair(adns_query qu, void *datap) {
1129   adns_rr_intstrpair *rrp= datap;
1130
1131   adns__makefinal_str(qu,&rrp->array[0].str);
1132   adns__makefinal_str(qu,&rrp->array[1].str);
1133 }
1134
1135 /*
1136  * _hinfo   (pa)
1137  */
1138
1139 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1140                             int max, void *datap) {
1141   adns_rr_intstrpair *rrp= datap;
1142   adns_status st;
1143   int i;
1144
1145   for (i=0; i<2; i++) {
1146     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1147     if (st) return st;
1148   }
1149
1150   if (cbyte != max) return adns_s_invaliddata;
1151
1152   return adns_s_ok;
1153 }
1154
1155 /*
1156  * _mailbox   (pap,cs +pap_mailbox822)
1157  */
1158
1159 static adns_status pap_mailbox822(const parseinfo *pai,
1160                                   int *cbyte_io, int max, char **mb_r) {
1161   int lablen, labstart, i, needquote, c, r, neednorm;
1162   const unsigned char *p;
1163   char *str;
1164   findlabel_state fls;
1165   adns_status st;
1166   vbuf *vb;
1167
1168   vb= &pai->qu->vb;
1169   vb->used= 0;
1170   adns__findlabel_start(&fls, pai->ads,
1171                         -1, pai->qu,
1172                         pai->dgram, pai->dglen, max,
1173                         *cbyte_io, cbyte_io);
1174   st= adns__findlabel_next(&fls,&lablen,&labstart);
1175   if (!lablen) {
1176     adns__vbuf_appendstr(vb,".");
1177     goto x_ok;
1178   }
1179
1180   neednorm= 1;
1181   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1182     c= *p++;
1183     if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1184     if (c == '.' && !neednorm) neednorm= 1;
1185     else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1186     else neednorm= 0;
1187   }
1188
1189   if (needquote || neednorm) {
1190     r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1191     adns__vbuf_appendq(vb,"\"",1);
1192     for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1193       c= *p;
1194       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1195       adns__vbuf_appendq(vb,p,1);
1196     }
1197     adns__vbuf_appendq(vb,"\"",1);
1198   } else {
1199     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1200   }
1201
1202   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1203
1204   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1205   if (st) return st;
1206
1207  x_ok:
1208   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1209   memcpy(str,vb->buf,vb->used);
1210   str[vb->used]= 0;
1211   *mb_r= str;
1212   return adns_s_ok;
1213 }
1214
1215 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1216                                char **mb_r) {
1217   if (pai->qu->typei->typekey & adns__qtf_mail822) {
1218     return pap_mailbox822(pai, cbyte_io, max, mb_r);
1219   } else {
1220     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1221   }
1222 }
1223
1224 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1225   return csp_domain(vb,mailbox);
1226 }
1227
1228 /*
1229  * _rp   (pa,cs)
1230  */
1231
1232 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1233                          int max, void *datap) {
1234   adns_rr_strpair *rrp= datap;
1235   adns_status st;
1236
1237   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1238   if (st) return st;
1239
1240   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1241   if (st) return st;
1242
1243   if (cbyte != max) return adns_s_invaliddata;
1244   return adns_s_ok;
1245 }
1246
1247 static adns_status cs_rp(vbuf *vb, const void *datap) {
1248   const adns_rr_strpair *rrp= datap;
1249   adns_status st;
1250
1251   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
1252   CSP_ADDSTR(" ");
1253   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
1254
1255   return adns_s_ok;
1256 }
1257
1258 /*
1259  * _soa   (pa,mf,cs)
1260  */
1261
1262 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1263                           int max, void *datap) {
1264   adns_rr_soa *rrp= datap;
1265   const byte *dgram= pai->dgram;
1266   adns_status st;
1267   int msw, lsw, i;
1268
1269   st= pap_domain(pai, &cbyte, max, &rrp->mname,
1270                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1271   if (st) return st;
1272
1273   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1274   if (st) return st;
1275
1276   if (cbyte+20 != max) return adns_s_invaliddata;
1277
1278   for (i=0; i<5; i++) {
1279     GET_W(cbyte,msw);
1280     GET_W(cbyte,lsw);
1281     (&rrp->serial)[i]= (msw<<16) | lsw;
1282   }
1283
1284   return adns_s_ok;
1285 }
1286
1287 static void mf_soa(adns_query qu, void *datap) {
1288   adns_rr_soa *rrp= datap;
1289
1290   adns__makefinal_str(qu,&rrp->mname);
1291   adns__makefinal_str(qu,&rrp->rname);
1292 }
1293
1294 static adns_status cs_soa(vbuf *vb, const void *datap) {
1295   const adns_rr_soa *rrp= datap;
1296   char buf[20];
1297   int i;
1298   adns_status st;
1299
1300   st= csp_domain(vb,rrp->mname);  if (st) return st;
1301   CSP_ADDSTR(" ");
1302   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
1303
1304   for (i=0; i<5; i++) {
1305     sprintf(buf," %lu",(&rrp->serial)[i]);
1306     CSP_ADDSTR(buf);
1307   }
1308
1309   return adns_s_ok;
1310 }
1311
1312 /*
1313  * _srv*  (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1314  */
1315
1316 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1317                            union checklabel_state *cls, qcontext *ctx,
1318                            int labnum, const char *label, int lablen) {
1319   if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1320     if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1321     return adns_s_ok;
1322   }
1323   return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1324 }
1325
1326 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1327                                  adns_rr_srvha *rrp
1328                                    /* might be adns_rr_srvraw* */) {
1329   const byte *dgram= pai->dgram;
1330   int ti, cbyte;
1331
1332   cbyte= *cbyte_io;
1333   if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1334
1335   rrp->priority= GET_W(cbyte, ti);
1336   rrp->weight=   GET_W(cbyte, ti);
1337   rrp->port=     GET_W(cbyte, ti);
1338   return adns_s_ok;
1339 }
1340
1341 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1342                              int max, void *datap) {
1343   adns_rr_srvraw *rrp= datap;
1344   adns_status st;
1345
1346   st= pap_srv_begin(pai,&cbyte,max,datap);
1347   if (st) return st;
1348
1349   st= pap_domain(pai, &cbyte, max, &rrp->host,
1350                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1351   if (st) return st;
1352
1353   if (cbyte != max) return adns_s_invaliddata;
1354   return adns_s_ok;
1355 }
1356
1357 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1358                             int max, void *datap) {
1359   adns_rr_srvha *rrp= datap;
1360   adns_status st;
1361
1362   st= pap_srv_begin(pai,&cbyte,max,datap);       if (st) return st;
1363   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);  if (st) return st;
1364   if (cbyte != max) return adns_s_invaliddata;
1365   return adns_s_ok;
1366 }
1367
1368 static void mf_srvraw(adns_query qu, void *datap) {
1369   adns_rr_srvraw *rrp= datap;
1370   adns__makefinal_str(qu, &rrp->host);
1371 }
1372
1373 static void mf_srvha(adns_query qu, void *datap) {
1374   adns_rr_srvha *rrp= datap;
1375   mfp_hostaddr(qu,&rrp->ha);
1376 }
1377
1378 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1379   const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1380     /* might be const adns_rr_svhostaddr* */
1381
1382   if (ap->priority < bp->priority) return 0;
1383   if (ap->priority > bp->priority) return 1;
1384   return 0;
1385 }
1386
1387 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1388                                    /* might be adns_rr_srvraw* */) {
1389   char buf[30];
1390   sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1391   CSP_ADDSTR(buf);
1392   return adns_s_ok;
1393 }
1394
1395 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1396   const adns_rr_srvraw *rrp= datap;
1397   adns_status st;
1398
1399   st= csp_srv_begin(vb,(const void*)rrp);  if (st) return st;
1400   return csp_domain(vb,rrp->host);
1401 }
1402
1403 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1404   const adns_rr_srvha *rrp= datap;
1405   adns_status st;
1406
1407   st= csp_srv_begin(vb,(const void*)datap);  if (st) return st;
1408   return csp_hostaddr(vb,&rrp->ha);
1409 }
1410
1411 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1412                          const struct typeinfo *typei) {
1413   /* we treat everything in the array as if it were an adns_rr_srvha
1414    * even though the array might be of adns_rr_srvraw.  That's OK
1415    * because they have the same prefix, which is all we access.
1416    * We use rrsz, too, rather than naive array indexing, of course.
1417    */
1418   char *workbegin, *workend, *search, *arrayend;
1419   const adns_rr_srvha *rr;
1420   union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1421   int cpriority, totalweight, runtotal;
1422   long randval;
1423
1424   assert(rrsz <= sizeof(rrtmp));
1425   for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1426        workbegin < arrayend;
1427        workbegin= workend) {
1428     cpriority= (rr=(void*)workbegin)->priority;
1429
1430     for (workend= workbegin, totalweight= 0;
1431          workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1432          workend += rrsz) {
1433       totalweight += rr->weight;
1434     }
1435
1436     /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1437      * cpriority.  From now on, workbegin points to the `remaining'
1438      * records: we select one record at a time (RFC2782 `Usage rules'
1439      * and `Format of the SRV RR' subsection `Weight') to place at
1440      * workbegin (swapping with the one that was there, and then
1441      * advance workbegin. */
1442     for (;
1443          workbegin + rrsz < workend; /* don't bother if just one */
1444          workbegin += rrsz) {
1445
1446       randval= nrand48(ads->rand48xsubi);
1447       randval %= (totalweight + 1);
1448         /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1449          * totalweight must be <= 2^26 so probability nonuniformity is
1450          * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1451          *  abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1452          */
1453
1454       for (search=workbegin, runtotal=0;
1455            (runtotal += (rr=(void*)search)->weight) < randval;
1456            search += rrsz);
1457       assert(search < arrayend);
1458       totalweight -= rr->weight;
1459       if (search != workbegin) {
1460         memcpy(&rrtmp, workbegin, rrsz);
1461         memcpy(workbegin, search, rrsz);
1462         memcpy(search, &rrtmp, rrsz);
1463       }
1464     }
1465   }
1466   /* tests:
1467    *  dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1468    *   ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1469    *   ./adnshost_s -t srv- _jabber._tcp.jabber.org
1470    */
1471 }
1472
1473 /*
1474  * _byteblock   (mf)
1475  */
1476
1477 static void mf_byteblock(adns_query qu, void *datap) {
1478   adns_rr_byteblock *rrp= datap;
1479   void *bytes= rrp->data;
1480   adns__makefinal_block(qu,&bytes,rrp->len);
1481   rrp->data= bytes;
1482 }
1483
1484 /*
1485  * _opaque   (pa,cs)
1486  */
1487
1488 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1489                              int max, void *datap) {
1490   adns_rr_byteblock *rrp= datap;
1491
1492   rrp->len= max - cbyte;
1493   rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1494   if (!rrp->data) R_NOMEM;
1495   memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1496   return adns_s_ok;
1497 }
1498
1499 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1500   const adns_rr_byteblock *rrp= datap;
1501   char buf[10];
1502   int l;
1503   unsigned char *p;
1504
1505   sprintf(buf,"\\# %d",rrp->len);
1506   CSP_ADDSTR(buf);
1507
1508   for (l= rrp->len, p= rrp->data;
1509        l>=4;
1510        l -= 4, p += 4) {
1511     sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1512     CSP_ADDSTR(buf);
1513   }
1514   for (;
1515        l>0;
1516        l--, p++) {
1517     sprintf(buf," %02x",*p);
1518     CSP_ADDSTR(buf);
1519   }
1520   return adns_s_ok;
1521 }
1522
1523 /*
1524  * _flat   (mf)
1525  */
1526
1527 static void mf_flat(adns_query qu, void *data) { }
1528
1529 /*
1530  * Now the table.
1531  */
1532
1533 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
1534
1535 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1536  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb,  \
1537      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1538      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1539      CDR(__VA_ARGS__) }
1540 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1541  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat,    \
1542      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1543      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1544      CDR(__VA_ARGS__) }
1545
1546 #define di_0 0
1547
1548 static const typeinfo typeinfos[] = {
1549 /* Must be in ascending order of rrtype ! */
1550 /* mem-mgmt code  rrt     fmt   member   parser      comparer  printer */
1551
1552 FLAT_TYPE(a,      "A",     0,   inaddr,    inaddr,  inaddr,inaddr          ),
1553 DEEP_TYPE(ns_raw, "NS",   "raw",str,       host_raw,0,     domain          ),
1554 DEEP_TYPE(cname,  "CNAME", 0,   str,       dom_raw, 0,     domain          ),
1555 DEEP_TYPE(soa_raw,"SOA",  "raw",soa,       soa,     0,     soa             ),
1556 DEEP_TYPE(ptr_raw,"PTR",  "raw",str,       host_raw,0,     domain          ),
1557 DEEP_TYPE(hinfo,  "HINFO", 0,   intstrpair,hinfo,   0,     hinfo           ),
1558 DEEP_TYPE(mx_raw, "MX",   "raw",intstr,    mx_raw,  mx_raw,inthost         ),
1559 DEEP_TYPE(txt,    "TXT",   0,   manyistr,  txt,     0,     txt             ),
1560 DEEP_TYPE(rp_raw, "RP",   "raw",strpair,   rp,      0,     rp              ),
1561 FLAT_TYPE(aaaa,   "AAAA",  0,   in6addr,   in6addr, in6addr,in6addr        ),
1562 DEEP_TYPE(srv_raw,"SRV",  "raw",srvraw ,   srvraw,  srv,   srvraw,
1563                               .checklabel= ckl_srv, .postsort= postsort_srv),
1564
1565 FLAT_TYPE(addr,   "A",  "addr", addr,      addr,    addr,  addr,
1566                                    .getrrsz= gsz_addr, .query_send= qs_addr),
1567 DEEP_TYPE(ns,     "NS", "+addr",hostaddr,  hostaddr,hostaddr,hostaddr      ),
1568 DEEP_TYPE(ptr,    "PTR","checked",str,     ptr,     0,     domain,
1569                                                        .checklabel= ckl_ptr),
1570 DEEP_TYPE(mx,     "MX", "+addr",inthostaddr,mx,     mx,    inthostaddr,    ),
1571 DEEP_TYPE(srv,    "SRV","+addr",srvha,     srvha,   srv,   srvha,
1572                               .checklabel= ckl_srv, .postsort= postsort_srv),
1573
1574 DEEP_TYPE(soa,    "SOA","822",  soa,       soa,     0,     soa             ),
1575 DEEP_TYPE(rp,     "RP", "822",  strpair,   rp,      0,     rp              ),
1576 };
1577
1578 static const typeinfo tinfo_addrsub =
1579 FLAT_TYPE(none,   "<addr>","sub",addr,     addr,    0,     addr,
1580                                                          .getrrsz= gsz_addr);
1581
1582 static const typeinfo typeinfo_unknown=
1583 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque,  0,     opaque            );
1584
1585 const typeinfo *adns__findtype(adns_rrtype type) {
1586   const typeinfo *begin, *end, *mid;
1587
1588   if (type & adns_r_unknown) return &typeinfo_unknown;
1589   type &= adns_rrt_reprmask;
1590
1591   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1592
1593   while (begin < end) {
1594     mid= begin + ((end-begin)>>1);
1595     if (mid->typekey == type) return mid;
1596     if (type > mid->typekey) begin= mid+1;
1597     else end= mid;
1598   }
1599   return 0;
1600 }