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   struct in6_addr v6map;
 386   const void *oaddr= dgram + *cbyte_io;
 387   int avail= max - *cbyte_io;
 388   int step= -1;
 389   void *addrp= 0;
 390
 391   switch (rrty) {
 392   case adns_r_a:
 393     if ((pai->qu->flags & adns_qf_ipv6_mapv4) &&
 394         (pai->qu->answer->type & adns__qtf_bigaddr)) {
 395       if (avail < 4) return adns_s_invaliddata;
 396       memset(v6map.s6_addr +  0, 0x00, 10);
 397       memset(v6map.s6_addr + 10, 0xff,  2);
 398       memcpy(v6map.s6_addr + 12, oaddr, 4);
 399       oaddr= v6map.s6_addr; avail= sizeof(v6map.s6_addr);
 400       if (step < 0) step= 4;
 401       goto aaaa;
 402     }
 403     af= AF_INET; addrlen= 4;
 404     addrp= &storeto->addr.inet.sin_addr;
 405     salen= sizeof(storeto->addr.inet);
 406     break;
 407   case adns_r_aaaa:
 408   aaaa:
 409     af= AF_INET6; addrlen= 16;
 410     addrp= storeto->addr.inet6.sin6_addr.s6_addr;
 411     salen= sizeof(storeto->addr.inet6);
 412     break;
 413   }
 414   assert(addrp);
 415
 416   assert(offsetof(adns_rr_addr, addr) + salen <= rrsz);
 417   if (addrlen < avail) return adns_s_invaliddata;
 418   if (step < 0) step= addrlen;
 419   *cbyte_io += step;
 420   memset(&storeto->addr, 0, salen);
 421   storeto->len= salen;
 422   storeto->addr.sa.sa_family= af;
 423   memcpy(addrp, oaddr, addrlen);
 424
 425   return adns_s_ok;
 426 }
 427
 428 static adns_status pa_addr(const parseinfo *pai, int cbyte,
 429                            int max, void *datap) {
 430   int err= pap_addr(pai, pai->qu->answer->type & adns_rrt_typemask,
 431                     pai->qu->answer->rrsz, &cbyte, max, datap);
 432   if (err) return err;
 433   if (cbyte != max) return adns_s_invaliddata;
 434   return adns_s_ok;
 435 }
 436
 437 static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) {
 438   union gen_addr a;
 439   adns__sockaddr_extract(sa, &a, 0);
 440   return search_sortlist(ads, sa->sa_family, &a);
 441 }
 442
 443 static int dip_sockaddr(adns_state ads,
 444                         const struct sockaddr *sa,
 445                         const struct sockaddr *sb) {
 446   if (!ads->sortlist) return 0;
 447   return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb);
 448 }
 449
 450 static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) {
 451   const adns_rr_addr *ap= datap_a, *bp= datap_b;
 452   return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa);
 453 }
 454
 455 static int div_addr(void *context, const void *datap_a, const void *datap_b) {
 456   const adns_state ads= context;
 457
 458   return di_addr(ads, datap_a, datap_b);
 459 }
 460
 461 static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) {
 462   char buf[ADNS_ADDR2TEXT_BUFLEN];
 463   int len= sizeof(buf);
 464   int err;
 465
 466   switch (rrp->addr.inet.sin_family) {
 467   case AF_INET:
 468     CSP_ADDSTR("INET ");
 469     goto a2t;
 470   case AF_INET6:
 471     CSP_ADDSTR("INET6 ");
 472     goto a2t;
 473   a2t:
 474     err= adns_addr2text(&rrp->addr.sa,0, buf,&len, 0); assert(!err);
 475     CSP_ADDSTR(buf);
 476     break;
 477   default:
 478     sprintf(buf,"AF=%u",rrp->addr.sa.sa_family);
 479     CSP_ADDSTR(buf);
 480     break;
 481   }
 482   return adns_s_ok;
 483 }
 484
 485 static adns_status cs_addr(vbuf *vb, const void *datap) {
 486   const adns_rr_addr *rrp= datap;
 487
 488   return csp_addr(vb,rrp);
 489 }
 490
 491 static int gsz_addr(const typeinfo *typei, adns_rrtype type) {
 492   return type & adns__qtf_bigaddr ?
 493     sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only);
 494 }
 495
 496 static unsigned addr_rrtypes(adns_state ads, adns_rrtype type,
 497                              adns_queryflags qf) {
 498   /* Return a mask of addr_rf_... flags indicating which address families are
 499    * wanted, given a query type and flags.
 500    */
 501   return addr_rf_a;
 502 }
 503
 504 static void icb_addr(adns_query parent, adns_query child);
 505
 506 static void addr_subqueries(adns_query qu, struct timeval now,
 507                             adns_queryflags qf_extra,
 508                             const byte *qd_dgram, int qd_dglen) {
 509   int i, err, id;
 510   adns_query cqu;
 511   adns_queryflags qf= (qu->flags & ~adns_qf_search) | qf_extra;
 512   adns_rrtype qtf= qu->answer->type & adns__qtf_deref;
 513   unsigned which= qu->ctx.tinfo.addr.want & ~qu->ctx.tinfo.addr.have;
 514   qcontext ctx;
 515
 516   memset(&ctx, 0, sizeof(ctx));
 517   ctx.callback= icb_addr;
 518   for (i=0; i<addr_nrrtypes; i++) {
 519     if (!(which & (1 << i))) continue;
 520     err= adns__mkquery_frdgram(qu->ads, &qu->vb, &id, qd_dgram,qd_dglen,
 521                                DNS_HDRSIZE, addr_all_rrtypes[i], qf);
 522     if (err) goto x_error;
 523     err= adns__internal_submit(qu->ads, &cqu, &tinfo_addrsub,
 524                                addr_all_rrtypes[i] | qtf,
 525                                &qu->vb, id, qf, now, &ctx);
 526     if (err) goto x_error;
 527     cqu->answer->rrsz= qu->answer->rrsz;
 528     cqu->parent= qu;
 529     LIST_LINK_TAIL_PART(qu->children, cqu,siblings.);
 530   }
 531   qu->state= query_childw;
 532   LIST_LINK_TAIL(qu->ads->childw, qu);
 533   return;
 534
 535 x_error:
 536   adns__query_fail(qu, err);
 537 }
 538
 539 static adns_status addr_submit(adns_query parent, adns_query *query_r,
 540                                vbuf *qumsg_vb, int id, unsigned want,
 541                                adns_queryflags flags, struct timeval now,
 542                                qcontext *ctx) {
 543   /* This is effectively a substitute for adns__internal_submit, intended for
 544    * the case where the caller (possibly) only wants a subset of the
 545    * available record types.  The memory management and callback rules are
 546    * the same as for adns__internal_submit.
 547    *
 548    * Some differences: the query is linked onto the parent's children list
 549    * before exit (though the parent's state is not changed, and it is not
 550    * linked into the childw list queue); and we fiddle with the `tinfo'
 551    * portion of the context structure (yes, modifying *ctx), since this is,
 552    * in fact, the main purpose of this function.
 553    */
 554
 555   adns_state ads= parent->ads;
 556   adns_query qu;
 557   adns_status err;
 558   adns_rrtype type= ((adns_r_addr & adns_rrt_reprmask) |
 559                      (parent->answer->type & ~adns_rrt_reprmask));
 560
 561   ctx->tinfo.addr.want= want;
 562   ctx->tinfo.addr.have= 0;
 563   err= adns__internal_submit(ads, &qu, adns__findtype(adns_r_addr),
 564                              type, qumsg_vb, id, flags, now, ctx);
 565   if (err) return err;
 566
 567   qu->parent= parent;
 568   LIST_LINK_TAIL_PART(parent->children, qu, siblings.);
 569   *query_r= qu;
 570   return adns_s_ok;
 571 }
 572
 573 static adns_status append_addrs(adns_query qu, size_t rrsz,
 574                                 adns_rr_addr **dp, int *dlen,
 575                                 const adns_rr_addr *sp, int slen) {
 576   /* Append a vector of slen addr records, each of size rrsz, starting at ap,
 577    * to a vector starting at *dp, of length *dlen.  On successful completion,
 578    * *dp and *dlen are updated.
 579    */
 580
 581   size_t drrsz= *dlen*rrsz, srrsz= slen*rrsz;
 582   byte *p;
 583
 584   if (!slen) return adns_s_ok;
 585   p= adns__alloc_interim(qu, drrsz + srrsz);
 586   if (!p) R_NOMEM;
 587   if (*dlen) {
 588     memcpy(p, *dp, drrsz);
 589     adns__free_interim(qu, *dp);
 590   }
 591   memcpy(p + drrsz, sp, srrsz);
 592   *dlen += slen;
 593   *dp= (adns_rr_addr *)p;
 594   return adns_s_ok;
 595 }
 596
 597 static void propagate_ttl(adns_query to, adns_query from)
 598   { if (to->expires > from->expires) to->expires= from->expires; }
 599
 600 static adns_status copy_cname_from_child(adns_query parent, adns_query child) {
 601   adns_answer *pans= parent->answer, *cans= child->answer;
 602   size_t n= strlen(cans->cname) + 1;
 603
 604   pans->cname= adns__alloc_preserved(parent, n);
 605   if (!pans->cname) R_NOMEM;
 606   memcpy(pans->cname, cans->cname, n);
 607   return adns_s_ok;
 608 }
 609
 610 static void done_addr_type(adns_query qu, adns_rrtype type) {
 611   unsigned f= addr_rrtypeflag(type);
 612   assert(f); qu->ctx.tinfo.addr.have |= f;
 613 }
 614
 615 static void icb_addr(adns_query parent, adns_query child) {
 616   adns_state ads= parent->ads;
 617   adns_answer *pans= parent->answer, *cans= child->answer;
 618   struct timeval now;
 619   adns_status err;
 620
 621   propagate_ttl(parent, child);
 622
 623   if (cans->cname && !pans->cname) {
 624     err= copy_cname_from_child(parent, child);
 625     if (err) goto x_err;
 626   }
 627
 628   if ((parent->flags & adns_qf_search) &&
 629       !pans->cname && cans->status == adns_s_nxdomain) {
 630     /* We're searching a list of suffixes, and the name doesn't exist.  Try
 631      * the next one.
 632      */
 633
 634     adns__cancel_children(parent);
 635     adns__free_interim(parent, pans->rrs.bytes);
 636     pans->rrs.bytes= 0; pans->nrrs= 0;
 637     if (gettimeofday(&now, 0)) goto x_gtod;
 638     adns__search_next(ads, parent, now);
 639     return;
 640   }
 641
 642   if (cans->status && cans->status != adns_s_nodata)
 643     { err= cans->status; goto x_err; }
 644
 645   assert(pans->rrsz == cans->rrsz);
 646   err= append_addrs(parent, pans->rrsz,
 647                     &pans->rrs.addr, &pans->nrrs,
 648                     cans->rrs.addr, cans->nrrs);
 649   if (err) goto x_err;
 650   done_addr_type(parent, cans->type);
 651
 652   if (parent->children.head) LIST_LINK_TAIL(ads->childw, parent);
 653   else if (!pans->nrrs) adns__query_fail(parent, adns_s_nodata);
 654   else adns__query_done(parent);
 655   return;
 656
 657 x_gtod:
 658   adns__diag(ads, -1, parent, "gettimeofday failed: %s", strerror(errno));
 659   err= adns_s_systemfail;
 660   goto x_err;
 661
 662 x_err:
 663   adns__query_fail(parent, err);
 664 }
 665
 666 static void qs_addr(adns_query qu, struct timeval now) {
 667   if (!qu->ctx.tinfo.addr.want) {
 668     qu->ctx.tinfo.addr.want= addr_rrtypes(qu->ads, qu->answer->type,
 669                                           qu->flags);
 670     qu->ctx.tinfo.addr.have= 0;
 671   }
 672   addr_subqueries(qu, now, 0, qu->query_dgram, qu->query_dglen);
 673 }
 674
 675 /*
 676  * _domain      (pap,csp,cs)
 677  * _dom_raw     (pa)
 678  */
 679
 680 static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max,
 681                               char **domain_r, parsedomain_flags flags) {
 682   adns_status st;
 683   char *dm;
 684
 685   st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags,
 686                          pai->dgram,pai->dglen, cbyte_io, max);
 687   if (st) return st;
 688   if (!pai->qu->vb.used) return adns_s_invaliddata;
 689
 690   dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1);
 691   if (!dm) R_NOMEM;
 692
 693   dm[pai->qu->vb.used]= 0;
 694   memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used);
 695
 696   *domain_r= dm;
 697   return adns_s_ok;
 698 }
 699
 700 static adns_status csp_domain(vbuf *vb, const char *domain) {
 701   CSP_ADDSTR(domain);
 702   if (!*domain) CSP_ADDSTR(".");
 703   return adns_s_ok;
 704 }
 705
 706 static adns_status cs_domain(vbuf *vb, const void *datap) {
 707   const char *const *domainp= datap;
 708   return csp_domain(vb,*domainp);
 709 }
 710
 711 static adns_status pa_dom_raw(const parseinfo *pai, int cbyte,
 712                               int max, void *datap) {
 713   char **rrp= datap;
 714   adns_status st;
 715
 716   st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok);
 717   if (st) return st;
 718
 719   if (cbyte != max) return adns_s_invaliddata;
 720   return adns_s_ok;
 721 }
 722
 723 /*
 724  * _host_raw   (pa)
 725  */
 726
 727 static adns_status pa_host_raw(const parseinfo *pai, int cbyte,
 728                                int max, void *datap) {
 729   char **rrp= datap;
 730   adns_status st;
 731
 732   st= pap_domain(pai, &cbyte, max, rrp,
 733                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 734   if (st) return st;
 735
 736   if (cbyte != max) return adns_s_invaliddata;
 737   return adns_s_ok;
 738 }
 739
 740 /*
 741  * _hostaddr   (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr)
 742  */
 743
 744 static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha,
 745                                  unsigned *want_io, size_t addrsz,
 746                                  int *cbyte_io, int count, int dmstart) {
 747   int rri, naddrs;
 748   unsigned typef, want= *want_io, need= want;
 749   int type, class, rdlen, rdend, rdstart, ownermatched;
 750   unsigned long ttl;
 751   adns_status st;
 752
 753   for (rri=0, naddrs=0; rri<count; rri++) {
 754     st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram,
 755                             pai->dglen, cbyte_io,
 756                             &type, &class, &ttl, &rdlen, &rdstart,
 757                             pai->dgram, pai->dglen, dmstart, &ownermatched);
 758     if (st) return st;
 759     if (!ownermatched || class != DNS_CLASS_IN) continue;
 760     typef= addr_rrtypeflag(type);
 761     if (!(want & typef)) continue;
 762     need &= ~typef;
 763     if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) R_NOMEM;
 764     adns__update_expires(pai->qu,ttl,pai->now);
 765     rdend= rdstart + rdlen;
 766     st= pap_addr(pai, type, addrsz, &rdstart, rdend,
 767                  (adns_rr_addr *)(pai->qu->vb.buf + naddrs*addrsz));
 768     if (st) return st;
 769     if (rdstart != rdend) return adns_s_invaliddata;
 770     naddrs++;
 771   }
 772   if (naddrs > 0) {
 773     st= append_addrs(pai->qu, addrsz, &ha->addrs, &ha->naddrs,
 774                      (const adns_rr_addr *)pai->qu->vb.buf, naddrs);
 775     if (st) return st;
 776     ha->astatus= adns_s_ok;
 777
 778     if (!need) {
 779       adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf,
 780                   div_addr, pai->ads);
 781     }
 782   }
 783   *want_io= need;
 784   return adns_s_ok;
 785 }
 786
 787 static void icb_hostaddr(adns_query parent, adns_query child) {
 788   adns_answer *cans= child->answer;
 789   adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr;
 790   adns_state ads= parent->ads;
 791   adns_status st;
 792   size_t addrsz= gsz_addr(0, parent->answer->type);
 793
 794   st= cans->status == adns_s_nodata ? adns_s_ok : cans->status;
 795   if (st) goto done;
 796   propagate_ttl(parent, child);
 797
 798   assert(addrsz == cans->rrsz);
 799   st= append_addrs(parent, addrsz,
 800                    &rrp->addrs, &rrp->naddrs,
 801                    cans->rrs.addr, cans->nrrs);
 802   if (st) goto done;
 803   if (!rrp->naddrs) { st= adns_s_nodata; goto done; }
 804
 805   if (!adns__vbuf_ensure(&parent->vb, addrsz))
 806     { st= adns_s_nomemory; goto done; }
 807   adns__isort(rrp->addrs, rrp->naddrs, addrsz, parent->vb.buf,
 808               div_addr, ads);
 809
 810 done:
 811   if (st) {
 812     adns__free_interim(parent, rrp->addrs);
 813     rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : 0;
 814   }
 815
 816   rrp->astatus= st;
 817   if (parent->children.head) {
 818     LIST_LINK_TAIL(ads->childw,parent);
 819   } else {
 820     adns__query_done(parent);
 821   }
 822 }
 823
 824 static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io,
 825                                 int max, adns_rr_hostaddr *rrp) {
 826   adns_status st;
 827   int dmstart, cbyte;
 828   qcontext ctx;
 829   int id;
 830   adns_query nqu;
 831   adns_queryflags nflags;
 832   unsigned want;
 833   size_t addrsz= gsz_addr(0, pai->qu->answer->type);
 834
 835   dmstart= cbyte= *cbyte_io;
 836   st= pap_domain(pai, &cbyte, max, &rrp->host,
 837                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 838   if (st) return st;
 839   *cbyte_io= cbyte;
 840
 841   rrp->astatus= adns_s_ok;
 842   rrp->naddrs= 0;
 843   rrp->addrs= 0;
 844
 845   cbyte= pai->nsstart;
 846
 847   want= addr_rrtypes(pai->ads, pai->qu->answer->type, pai->qu->flags);
 848
 849   st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->nscount, dmstart);
 850   if (st) return st;
 851   if (!want) return adns_s_ok;
 852
 853   st= pap_findaddrs(pai, rrp, &want, addrsz, &cbyte, pai->arcount, dmstart);
 854   if (st) return st;
 855   if (!want) return adns_s_ok;
 856
 857   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
 858                             pai->dgram, pai->dglen, dmstart,
 859                             adns_r_addr, adns_qf_quoteok_query);
 860   if (st) return st;
 861
 862   ctx.ext= 0;
 863   ctx.callback= icb_hostaddr;
 864   ctx.pinfo.hostaddr= rrp;
 865
 866   nflags= adns_qf_quoteok_query | (pai->qu->flags & adns_qf_ipv6_mapv4);
 867   if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid;
 868
 869   st= addr_submit(pai->qu, &nqu, &pai->qu->vb, id, want,
 870                   nflags, pai->now, &ctx);
 871   if (st) return st;
 872
 873   return adns_s_ok;
 874 }
 875
 876 static adns_status pa_hostaddr(const parseinfo *pai, int cbyte,
 877                                int max, void *datap) {
 878   adns_rr_hostaddr *rrp= datap;
 879   adns_status st;
 880
 881   st= pap_hostaddr(pai, &cbyte, max, rrp);
 882   if (st) return st;
 883   if (cbyte != max) return adns_s_invaliddata;
 884
 885   return adns_s_ok;
 886 }
 887
 888 static int dip_hostaddr(adns_state ads,
 889                         const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) {
 890   if (ap->astatus != bp->astatus) return ap->astatus;
 891   if (ap->astatus) return 0;
 892
 893   return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa);
 894 }
 895
 896 static int di_hostaddr(adns_state ads,
 897                        const void *datap_a, const void *datap_b) {
 898   const adns_rr_hostaddr *ap= datap_a, *bp= datap_b;
 899
 900   return dip_hostaddr(ads, ap,bp);
 901 }
 902
 903 static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) {
 904   void *tablev;
 905   size_t addrsz= gsz_addr(0, qu->answer->type);
 906
 907   adns__makefinal_str(qu,&rrp->host);
 908   tablev= rrp->addrs;
 909   adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz);
 910   rrp->addrs= tablev;
 911 }
 912
 913 static void mf_hostaddr(adns_query qu, void *datap) {
 914   adns_rr_hostaddr *rrp= datap;
 915
 916   mfp_hostaddr(qu,rrp);
 917 }
 918
 919 static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) {
 920   const char *errstr;
 921   adns_status st;
 922   char buf[20];
 923   int i;
 924
 925   st= csp_domain(vb,rrp->host);  if (st) return st;
 926
 927   CSP_ADDSTR(" ");
 928   CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus));
 929
 930   sprintf(buf," %d ",rrp->astatus);
 931   CSP_ADDSTR(buf);
 932
 933   CSP_ADDSTR(adns_errabbrev(rrp->astatus));
 934   CSP_ADDSTR(" ");
 935
 936   errstr= adns_strerror(rrp->astatus);
 937   st= csp_qstring(vb,errstr,strlen(errstr));  if (st) return st;
 938
 939   if (rrp->naddrs >= 0) {
 940     CSP_ADDSTR(" (");
 941     for (i=0; i<rrp->naddrs; i++) {
 942       CSP_ADDSTR(" ");
 943       st= csp_addr(vb,&rrp->addrs[i]);
 944     }
 945     CSP_ADDSTR(" )");
 946   } else {
 947     CSP_ADDSTR(" ?");
 948   }
 949   return adns_s_ok;
 950 }
 951
 952 static adns_status cs_hostaddr(vbuf *vb, const void *datap) {
 953   const adns_rr_hostaddr *rrp= datap;
 954
 955   return csp_hostaddr(vb,rrp);
 956 }
 957
 958 /*
 959  * _mx_raw   (pa,di)
 960  */
 961
 962 static adns_status pa_mx_raw(const parseinfo *pai, int cbyte,
 963                              int max, void *datap) {
 964   const byte *dgram= pai->dgram;
 965   adns_rr_intstr *rrp= datap;
 966   adns_status st;
 967   int pref;
 968
 969   if (cbyte+2 > max) return adns_s_invaliddata;
 970   GET_W(cbyte,pref);
 971   rrp->i= pref;
 972   st= pap_domain(pai, &cbyte, max, &rrp->str,
 973                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
 974   if (st) return st;
 975
 976   if (cbyte != max) return adns_s_invaliddata;
 977   return adns_s_ok;
 978 }
 979
 980 static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) {
 981   const adns_rr_intstr *ap= datap_a, *bp= datap_b;
 982
 983   if (ap->i < bp->i) return 0;
 984   if (ap->i > bp->i) return 1;
 985   return 0;
 986 }
 987
 988 /*
 989  * _mx   (pa,di)
 990  */
 991
 992 static adns_status pa_mx(const parseinfo *pai, int cbyte,
 993                          int max, void *datap) {
 994   const byte *dgram= pai->dgram;
 995   adns_rr_inthostaddr *rrp= datap;
 996   adns_status st;
 997   int pref;
 998
 999   if (cbyte+2 > max) return adns_s_invaliddata;
1000   GET_W(cbyte,pref);
1001   rrp->i= pref;
1002   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);
1003   if (st) return st;
1004
1005   if (cbyte != max) return adns_s_invaliddata;
1006   return adns_s_ok;
1007 }
1008
1009 static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) {
1010   const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b;
1011
1012   if (ap->i < bp->i) return 0;
1013   if (ap->i > bp->i) return 1;
1014   return dip_hostaddr(ads, &ap->ha, &bp->ha);
1015 }
1016
1017 /*
1018  * _inthostaddr  (mf,cs)
1019  */
1020
1021 static void mf_inthostaddr(adns_query qu, void *datap) {
1022   adns_rr_inthostaddr *rrp= datap;
1023
1024   mfp_hostaddr(qu,&rrp->ha);
1025 }
1026
1027 static adns_status cs_inthostaddr(vbuf *vb, const void *datap) {
1028   const adns_rr_inthostaddr *rrp= datap;
1029   char buf[10];
1030
1031   sprintf(buf,"%u ",rrp->i);
1032   CSP_ADDSTR(buf);
1033
1034   return csp_hostaddr(vb,&rrp->ha);
1035 }
1036
1037 /*
1038  * _inthost  (cs)
1039  */
1040
1041 static adns_status cs_inthost(vbuf *vb, const void *datap) {
1042   const adns_rr_intstr *rrp= datap;
1043   char buf[10];
1044
1045   sprintf(buf,"%u ",rrp->i);
1046   CSP_ADDSTR(buf);
1047   return csp_domain(vb,rrp->str);
1048 }
1049
1050 /*
1051  * _ptr   (ckl,pa +icb_ptr)
1052  */
1053
1054 static adns_status ckl_ptr(adns_state ads, adns_queryflags flags,
1055                            union checklabel_state *cls, qcontext *ctx,
1056                            int labnum, const char *label, int lablen) {
1057   if (lablen) {
1058     if (adns__revparse_label(&cls->ptr, labnum, label,lablen))
1059       return adns_s_querydomainwrong;
1060   } else {
1061     if (adns__revparse_done(&cls->ptr, labnum,
1062                             &ctx->tinfo.ptr.rev_rrtype,
1063                             &ctx->tinfo.ptr.addr))
1064       return adns_s_querydomainwrong;
1065   }
1066   return adns_s_ok;
1067 }
1068
1069 static void icb_ptr(adns_query parent, adns_query child) {
1070   adns_answer *cans= child->answer;
1071   const struct af_addr *queried;
1072   const unsigned char *found;
1073   adns_state ads= parent->ads;
1074   int i;
1075
1076   if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) {
1077     adns__query_fail(parent,adns_s_inconsistent);
1078     return;
1079   } else if (cans->status) {
1080     adns__query_fail(parent,cans->status);
1081     return;
1082   }
1083
1084   queried= &parent->ctx.tinfo.ptr.addr;
1085   for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) {
1086     if (adns__genaddr_equal_p(queried->af,&queried->addr,
1087                               parent->ctx.tinfo.ptr.addr.af,found)) {
1088       if (!parent->children.head) {
1089         adns__query_done(parent);
1090         return;
1091       } else {
1092         LIST_LINK_TAIL(ads->childw,parent);
1093         return;
1094       }
1095     }
1096   }
1097
1098   adns__query_fail(parent,adns_s_inconsistent);
1099 }
1100
1101 static adns_status pa_ptr(const parseinfo *pai, int dmstart,
1102                           int max, void *datap) {
1103   char **rrp= datap;
1104   adns_status st;
1105   adns_rrtype rrtype= pai->qu->ctx.tinfo.ptr.rev_rrtype;
1106   int cbyte, id;
1107   adns_query nqu;
1108   qcontext ctx;
1109
1110   cbyte= dmstart;
1111   st= pap_domain(pai, &cbyte, max, rrp,
1112                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1113   if (st) return st;
1114   if (cbyte != max) return adns_s_invaliddata;
1115
1116   st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id,
1117                             pai->dgram, pai->dglen, dmstart,
1118                             rrtype, adns_qf_quoteok_query);
1119   if (st) return st;
1120
1121   ctx.ext= 0;
1122   ctx.callback= icb_ptr;
1123   memset(&ctx.pinfo,0,sizeof(ctx.pinfo));
1124   memset(&ctx.tinfo,0,sizeof(ctx.tinfo));
1125   st= adns__internal_submit(pai->ads, &nqu, adns__findtype(rrtype),
1126                             rrtype, &pai->qu->vb, id,
1127                             adns_qf_quoteok_query, pai->now, &ctx);
1128   if (st) return st;
1129
1130   nqu->parent= pai->qu;
1131   LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.);
1132   return adns_s_ok;
1133 }
1134
1135 /*
1136  * _strpair   (mf)
1137  */
1138
1139 static void mf_strpair(adns_query qu, void *datap) {
1140   adns_rr_strpair *rrp= datap;
1141
1142   adns__makefinal_str(qu,&rrp->array[0]);
1143   adns__makefinal_str(qu,&rrp->array[1]);
1144 }
1145
1146 /*
1147  * _intstrpair   (mf)
1148  */
1149
1150 static void mf_intstrpair(adns_query qu, void *datap) {
1151   adns_rr_intstrpair *rrp= datap;
1152
1153   adns__makefinal_str(qu,&rrp->array[0].str);
1154   adns__makefinal_str(qu,&rrp->array[1].str);
1155 }
1156
1157 /*
1158  * _hinfo   (pa)
1159  */
1160
1161 static adns_status pa_hinfo(const parseinfo *pai, int cbyte,
1162                             int max, void *datap) {
1163   adns_rr_intstrpair *rrp= datap;
1164   adns_status st;
1165   int i;
1166
1167   for (i=0; i<2; i++) {
1168     st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str);
1169     if (st) return st;
1170   }
1171
1172   if (cbyte != max) return adns_s_invaliddata;
1173
1174   return adns_s_ok;
1175 }
1176
1177 /*
1178  * _mailbox   (pap,cs +pap_mailbox822)
1179  */
1180
1181 static adns_status pap_mailbox822(const parseinfo *pai,
1182                                   int *cbyte_io, int max, char **mb_r) {
1183   int lablen, labstart, i, needquote, c, r, neednorm;
1184   const unsigned char *p;
1185   char *str;
1186   findlabel_state fls;
1187   adns_status st;
1188   vbuf *vb;
1189
1190   vb= &pai->qu->vb;
1191   vb->used= 0;
1192   adns__findlabel_start(&fls, pai->ads,
1193                         -1, pai->qu,
1194                         pai->dgram, pai->dglen, max,
1195                         *cbyte_io, cbyte_io);
1196   st= adns__findlabel_next(&fls,&lablen,&labstart);
1197   if (!lablen) {
1198     adns__vbuf_appendstr(vb,".");
1199     goto x_ok;
1200   }
1201
1202   neednorm= 1;
1203   for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) {
1204     c= *p++;
1205     if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata;
1206     if (c == '.' && !neednorm) neednorm= 1;
1207     else if (c==' ' || c>=127 || ctype_822special(c)) needquote++;
1208     else neednorm= 0;
1209   }
1210
1211   if (needquote || neednorm) {
1212     r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM;
1213     adns__vbuf_appendq(vb,"\"",1);
1214     for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) {
1215       c= *p;
1216       if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1);
1217       adns__vbuf_appendq(vb,p,1);
1218     }
1219     adns__vbuf_appendq(vb,"\"",1);
1220   } else {
1221     r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM;
1222   }
1223
1224   r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM;
1225
1226   st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram);
1227   if (st) return st;
1228
1229  x_ok:
1230   str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM;
1231   memcpy(str,vb->buf,vb->used);
1232   str[vb->used]= 0;
1233   *mb_r= str;
1234   return adns_s_ok;
1235 }
1236
1237 static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max,
1238                                char **mb_r) {
1239   if (pai->qu->typei->typekey & adns__qtf_mail822) {
1240     return pap_mailbox822(pai, cbyte_io, max, mb_r);
1241   } else {
1242     return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok);
1243   }
1244 }
1245
1246 static adns_status csp_mailbox(vbuf *vb, const char *mailbox) {
1247   return csp_domain(vb,mailbox);
1248 }
1249
1250 /*
1251  * _rp   (pa,cs)
1252  */
1253
1254 static adns_status pa_rp(const parseinfo *pai, int cbyte,
1255                          int max, void *datap) {
1256   adns_rr_strpair *rrp= datap;
1257   adns_status st;
1258
1259   st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]);
1260   if (st) return st;
1261
1262   st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok);
1263   if (st) return st;
1264
1265   if (cbyte != max) return adns_s_invaliddata;
1266   return adns_s_ok;
1267 }
1268
1269 static adns_status cs_rp(vbuf *vb, const void *datap) {
1270   const adns_rr_strpair *rrp= datap;
1271   adns_status st;
1272
1273   st= csp_mailbox(vb,rrp->array[0]);  if (st) return st;
1274   CSP_ADDSTR(" ");
1275   st= csp_domain(vb,rrp->array[1]);  if (st) return st;
1276
1277   return adns_s_ok;
1278 }
1279
1280 /*
1281  * _soa   (pa,mf,cs)
1282  */
1283
1284 static adns_status pa_soa(const parseinfo *pai, int cbyte,
1285                           int max, void *datap) {
1286   adns_rr_soa *rrp= datap;
1287   const byte *dgram= pai->dgram;
1288   adns_status st;
1289   int msw, lsw, i;
1290
1291   st= pap_domain(pai, &cbyte, max, &rrp->mname,
1292                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1293   if (st) return st;
1294
1295   st= pap_mailbox(pai, &cbyte, max, &rrp->rname);
1296   if (st) return st;
1297
1298   if (cbyte+20 != max) return adns_s_invaliddata;
1299
1300   for (i=0; i<5; i++) {
1301     GET_W(cbyte,msw);
1302     GET_W(cbyte,lsw);
1303     (&rrp->serial)[i]= (msw<<16) | lsw;
1304   }
1305
1306   return adns_s_ok;
1307 }
1308
1309 static void mf_soa(adns_query qu, void *datap) {
1310   adns_rr_soa *rrp= datap;
1311
1312   adns__makefinal_str(qu,&rrp->mname);
1313   adns__makefinal_str(qu,&rrp->rname);
1314 }
1315
1316 static adns_status cs_soa(vbuf *vb, const void *datap) {
1317   const adns_rr_soa *rrp= datap;
1318   char buf[20];
1319   int i;
1320   adns_status st;
1321
1322   st= csp_domain(vb,rrp->mname);  if (st) return st;
1323   CSP_ADDSTR(" ");
1324   st= csp_mailbox(vb,rrp->rname);  if (st) return st;
1325
1326   for (i=0; i<5; i++) {
1327     sprintf(buf," %lu",(&rrp->serial)[i]);
1328     CSP_ADDSTR(buf);
1329   }
1330
1331   return adns_s_ok;
1332 }
1333
1334 /*
1335  * _srv*  (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort)
1336  */
1337
1338 static adns_status ckl_srv(adns_state ads, adns_queryflags flags,
1339                            union checklabel_state *cls, qcontext *ctx,
1340                            int labnum, const char *label, int lablen) {
1341   if (labnum < 2 && !(flags & adns_qf_quoteok_query)) {
1342     if (!lablen || label[0] != '_') return adns_s_querydomaininvalid;
1343     return adns_s_ok;
1344   }
1345   return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen);
1346 }
1347
1348 static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max,
1349                                  adns_rr_srvha *rrp
1350                                    /* might be adns_rr_srvraw* */) {
1351   const byte *dgram= pai->dgram;
1352   int ti, cbyte;
1353
1354   cbyte= *cbyte_io;
1355   if ((*cbyte_io += 6) > max) return adns_s_invaliddata;
1356
1357   rrp->priority= GET_W(cbyte, ti);
1358   rrp->weight=   GET_W(cbyte, ti);
1359   rrp->port=     GET_W(cbyte, ti);
1360   return adns_s_ok;
1361 }
1362
1363 static adns_status pa_srvraw(const parseinfo *pai, int cbyte,
1364                              int max, void *datap) {
1365   adns_rr_srvraw *rrp= datap;
1366   adns_status st;
1367
1368   st= pap_srv_begin(pai,&cbyte,max,datap);
1369   if (st) return st;
1370
1371   st= pap_domain(pai, &cbyte, max, &rrp->host,
1372                  pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0);
1373   if (st) return st;
1374
1375   if (cbyte != max) return adns_s_invaliddata;
1376   return adns_s_ok;
1377 }
1378
1379 static adns_status pa_srvha(const parseinfo *pai, int cbyte,
1380                             int max, void *datap) {
1381   adns_rr_srvha *rrp= datap;
1382   adns_status st;
1383
1384   st= pap_srv_begin(pai,&cbyte,max,datap);       if (st) return st;
1385   st= pap_hostaddr(pai, &cbyte, max, &rrp->ha);  if (st) return st;
1386   if (cbyte != max) return adns_s_invaliddata;
1387   return adns_s_ok;
1388 }
1389
1390 static void mf_srvraw(adns_query qu, void *datap) {
1391   adns_rr_srvraw *rrp= datap;
1392   adns__makefinal_str(qu, &rrp->host);
1393 }
1394
1395 static void mf_srvha(adns_query qu, void *datap) {
1396   adns_rr_srvha *rrp= datap;
1397   mfp_hostaddr(qu,&rrp->ha);
1398 }
1399
1400 static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) {
1401   const adns_rr_srvraw *ap= datap_a, *bp= datap_b;
1402     /* might be const adns_rr_svhostaddr* */
1403
1404   if (ap->priority < bp->priority) return 0;
1405   if (ap->priority > bp->priority) return 1;
1406   return 0;
1407 }
1408
1409 static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp
1410                                    /* might be adns_rr_srvraw* */) {
1411   char buf[30];
1412   sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port);
1413   CSP_ADDSTR(buf);
1414   return adns_s_ok;
1415 }
1416
1417 static adns_status cs_srvraw(vbuf *vb, const void *datap) {
1418   const adns_rr_srvraw *rrp= datap;
1419   adns_status st;
1420
1421   st= csp_srv_begin(vb,(const void*)rrp);  if (st) return st;
1422   return csp_domain(vb,rrp->host);
1423 }
1424
1425 static adns_status cs_srvha(vbuf *vb, const void *datap) {
1426   const adns_rr_srvha *rrp= datap;
1427   adns_status st;
1428
1429   st= csp_srv_begin(vb,(const void*)datap);  if (st) return st;
1430   return csp_hostaddr(vb,&rrp->ha);
1431 }
1432
1433 static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz,
1434                          const struct typeinfo *typei) {
1435   /* we treat everything in the array as if it were an adns_rr_srvha
1436    * even though the array might be of adns_rr_srvraw.  That's OK
1437    * because they have the same prefix, which is all we access.
1438    * We use rrsz, too, rather than naive array indexing, of course.
1439    */
1440   char *workbegin, *workend, *search, *arrayend;
1441   const adns_rr_srvha *rr;
1442   union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp;
1443   int cpriority, totalweight, runtotal;
1444   long randval;
1445
1446   assert(rrsz <= sizeof(rrtmp));
1447   for (workbegin= array, arrayend= workbegin + rrsz * nrrs;
1448        workbegin < arrayend;
1449        workbegin= workend) {
1450     cpriority= (rr=(void*)workbegin)->priority;
1451
1452     for (workend= workbegin, totalweight= 0;
1453          workend < arrayend && (rr=(void*)workend)->priority == cpriority;
1454          workend += rrsz) {
1455       totalweight += rr->weight;
1456     }
1457
1458     /* Now workbegin..(workend-1) incl. are exactly all of the RRs of
1459      * cpriority.  From now on, workbegin points to the `remaining'
1460      * records: we select one record at a time (RFC2782 `Usage rules'
1461      * and `Format of the SRV RR' subsection `Weight') to place at
1462      * workbegin (swapping with the one that was there, and then
1463      * advance workbegin. */
1464     for (;
1465          workbegin + rrsz < workend; /* don't bother if just one */
1466          workbegin += rrsz) {
1467
1468       randval= nrand48(ads->rand48xsubi);
1469       randval %= (totalweight + 1);
1470         /* makes it into 0..totalweight inclusive; with 2^10 RRs,
1471          * totalweight must be <= 2^26 so probability nonuniformity is
1472          * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie
1473          *  abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5).
1474          */
1475
1476       for (search=workbegin, runtotal=0;
1477            (runtotal += (rr=(void*)search)->weight) < randval;
1478            search += rrsz);
1479       assert(search < arrayend);
1480       totalweight -= rr->weight;
1481       if (search != workbegin) {
1482         memcpy(&rrtmp, workbegin, rrsz);
1483         memcpy(workbegin, search, rrsz);
1484         memcpy(search, &rrtmp, rrsz);
1485       }
1486     }
1487   }
1488   /* tests:
1489    *  dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk.
1490    *   ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk.
1491    *   ./adnshost_s -t srv- _jabber._tcp.jabber.org
1492    */
1493 }
1494
1495 /*
1496  * _byteblock   (mf)
1497  */
1498
1499 static void mf_byteblock(adns_query qu, void *datap) {
1500   adns_rr_byteblock *rrp= datap;
1501   void *bytes= rrp->data;
1502   adns__makefinal_block(qu,&bytes,rrp->len);
1503   rrp->data= bytes;
1504 }
1505
1506 /*
1507  * _opaque   (pa,cs)
1508  */
1509
1510 static adns_status pa_opaque(const parseinfo *pai, int cbyte,
1511                              int max, void *datap) {
1512   adns_rr_byteblock *rrp= datap;
1513
1514   rrp->len= max - cbyte;
1515   rrp->data= adns__alloc_interim(pai->qu, rrp->len);
1516   if (!rrp->data) R_NOMEM;
1517   memcpy(rrp->data, pai->dgram + cbyte, rrp->len);
1518   return adns_s_ok;
1519 }
1520
1521 static adns_status cs_opaque(vbuf *vb, const void *datap) {
1522   const adns_rr_byteblock *rrp= datap;
1523   char buf[10];
1524   int l;
1525   unsigned char *p;
1526
1527   sprintf(buf,"\\# %d",rrp->len);
1528   CSP_ADDSTR(buf);
1529
1530   for (l= rrp->len, p= rrp->data;
1531        l>=4;
1532        l -= 4, p += 4) {
1533     sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
1534     CSP_ADDSTR(buf);
1535   }
1536   for (;
1537        l>0;
1538        l--, p++) {
1539     sprintf(buf," %02x",*p);
1540     CSP_ADDSTR(buf);
1541   }
1542   return adns_s_ok;
1543 }
1544
1545 /*
1546  * _flat   (mf)
1547  */
1548
1549 static void mf_flat(adns_query qu, void *data) { }
1550
1551 /*
1552  * Now the table.
1553  */
1554
1555 #define TYPESZ_M(member)           (sizeof(*((adns_answer*)0)->rrs.member))
1556
1557 #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1558  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb,  \
1559      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1560      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1561      CDR(__VA_ARGS__) }
1562 #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...)     \
1563  { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat,    \
1564      GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer,             \
1565      adns__ckl_hostname, 0, adns__getrrsz_default, adns__query_send,    \
1566      CDR(__VA_ARGS__) }
1567
1568 #define di_0 0
1569
1570 static const typeinfo typeinfos[] = {
1571 /* Must be in ascending order of rrtype ! */
1572 /* mem-mgmt code  rrt     fmt   member   parser      comparer  printer */
1573
1574 FLAT_TYPE(a,      "A",     0,   inaddr,    inaddr,  inaddr,inaddr          ),
1575 DEEP_TYPE(ns_raw, "NS",   "raw",str,       host_raw,0,     domain          ),
1576 DEEP_TYPE(cname,  "CNAME", 0,   str,       dom_raw, 0,     domain          ),
1577 DEEP_TYPE(soa_raw,"SOA",  "raw",soa,       soa,     0,     soa             ),
1578 DEEP_TYPE(ptr_raw,"PTR",  "raw",str,       host_raw,0,     domain          ),
1579 DEEP_TYPE(hinfo,  "HINFO", 0,   intstrpair,hinfo,   0,     hinfo           ),
1580 DEEP_TYPE(mx_raw, "MX",   "raw",intstr,    mx_raw,  mx_raw,inthost         ),
1581 DEEP_TYPE(txt,    "TXT",   0,   manyistr,  txt,     0,     txt             ),
1582 DEEP_TYPE(rp_raw, "RP",   "raw",strpair,   rp,      0,     rp              ),
1583 FLAT_TYPE(aaaa,   "AAAA",  0,   in6addr,   in6addr, in6addr,in6addr        ),
1584 DEEP_TYPE(srv_raw,"SRV",  "raw",srvraw ,   srvraw,  srv,   srvraw,
1585                               .checklabel= ckl_srv, .postsort= postsort_srv),
1586
1587 FLAT_TYPE(addr,   "A",  "addr", addr,      addr,    addr,  addr,
1588                                    .getrrsz= gsz_addr, .query_send= qs_addr),
1589 DEEP_TYPE(ns,     "NS", "+addr",hostaddr,  hostaddr,hostaddr,hostaddr      ),
1590 DEEP_TYPE(ptr,    "PTR","checked",str,     ptr,     0,     domain,
1591                                                        .checklabel= ckl_ptr),
1592 DEEP_TYPE(mx,     "MX", "+addr",inthostaddr,mx,     mx,    inthostaddr,    ),
1593 DEEP_TYPE(srv,    "SRV","+addr",srvha,     srvha,   srv,   srvha,
1594                               .checklabel= ckl_srv, .postsort= postsort_srv),
1595
1596 DEEP_TYPE(soa,    "SOA","822",  soa,       soa,     0,     soa             ),
1597 DEEP_TYPE(rp,     "RP", "822",  strpair,   rp,      0,     rp              ),
1598 };
1599
1600 static const typeinfo tinfo_addrsub =
1601 FLAT_TYPE(none,   "<addr>","sub",addr,     addr,    0,     addr,
1602                                                          .getrrsz= gsz_addr);
1603
1604 static const typeinfo typeinfo_unknown=
1605 DEEP_TYPE(unknown,0, "unknown",byteblock,opaque,  0,     opaque            );
1606
1607 const typeinfo *adns__findtype(adns_rrtype type) {
1608   const typeinfo *begin, *end, *mid;
1609
1610   if (type & adns_r_unknown) return &typeinfo_unknown;
1611   type &= adns_rrt_reprmask;
1612
1613   begin= typeinfos;  end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo));
1614
1615   while (begin < end) {
1616     mid= begin + ((end-begin)>>1);
1617     if (mid->typekey == type) return mid;
1618     if (type > mid->typekey) begin= mid+1;
1619     else end= mid;
1620   }
1621   return 0;
1622 }