| 1 | /* |
| 2 | * types.c |
| 3 | * - RR-type-specific code, and the machinery to call it |
| 4 | */ |
| 5 | /* |
| 6 | * This file is part of adns, which is |
| 7 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson |
| 8 | * Copyright (C) 1999-2000,2003,2006 Tony Finch |
| 9 | * Copyright (C) 1991 Massachusetts Institute of Technology |
| 10 | * (See the file INSTALL for full details.) |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2, or (at your option) |
| 15 | * any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software Foundation, |
| 24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 25 | */ |
| 26 | |
| 27 | #include <stdlib.h> |
| 28 | |
| 29 | #include <sys/types.h> |
| 30 | #include <sys/socket.h> |
| 31 | #include <netinet/in.h> |
| 32 | #include <arpa/inet.h> |
| 33 | |
| 34 | #include "internal.h" |
| 35 | |
| 36 | #define R_NOMEM return adns_s_nomemory |
| 37 | #define CSP_ADDSTR(s) do { \ |
| 38 | if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; \ |
| 39 | } while (0) |
| 40 | |
| 41 | /* |
| 42 | * order of sections: |
| 43 | * |
| 44 | * _string (pap) |
| 45 | * _textdata, _qstring (csp) |
| 46 | * _str (mf,cs) |
| 47 | * _intstr (mf,csp,cs) |
| 48 | * _manyistr (mf,cs) |
| 49 | * _txt (pa) |
| 50 | * _inaddr (pa,di,cs +search_sortlist, dip_genaddr) |
| 51 | * _addr (pa,di,div,csp,cs,gsz |
| 52 | * +search_sortlist_sa, dip_sockaddr) |
| 53 | * _domain (pap,csp,cs) |
| 54 | * _dom_raw (pa) |
| 55 | * _host_raw (pa) |
| 56 | * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs |
| 57 | * +pap_findaddrs, icb_hostaddr) |
| 58 | * _mx_raw (pa,di) |
| 59 | * _mx (pa,di) |
| 60 | * _inthostaddr (mf,cs) |
| 61 | * _inthost (cs) |
| 62 | * _ptr (ckl,pa +icb_ptr) |
| 63 | * _strpair (mf) |
| 64 | * _intstrpair (mf) |
| 65 | * _hinfo (pa) |
| 66 | * _mailbox (pap,csp +pap_mailbox822) |
| 67 | * _rp (pa,cs) |
| 68 | * _soa (pa,mf,cs) |
| 69 | * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort) |
| 70 | * _byteblock (mf) |
| 71 | * _opaque (pa,cs) |
| 72 | * _flat (mf) |
| 73 | * |
| 74 | * within each section: |
| 75 | * ckl_* |
| 76 | * pap_* |
| 77 | * pa_* |
| 78 | * dip_* |
| 79 | * di_* |
| 80 | * mfp_* |
| 81 | * mf_* |
| 82 | * csp_* |
| 83 | * cs_* |
| 84 | * gsz_* |
| 85 | * postsort_* |
| 86 | */ |
| 87 | |
| 88 | /* |
| 89 | * _qstring (pap,csp) |
| 90 | */ |
| 91 | |
| 92 | static adns_status pap_qstring(const parseinfo *pai, int *cbyte_io, int max, |
| 93 | int *len_r, char **str_r) { |
| 94 | /* Neither len_r nor str_r may be null. |
| 95 | * End of datagram (overrun) is indicated by returning adns_s_invaliddata; |
| 96 | */ |
| 97 | const byte *dgram= pai->dgram; |
| 98 | int l, cbyte; |
| 99 | char *str; |
| 100 | |
| 101 | cbyte= *cbyte_io; |
| 102 | |
| 103 | if (cbyte >= max) return adns_s_invaliddata; |
| 104 | GET_B(cbyte,l); |
| 105 | if (cbyte+l > max) return adns_s_invaliddata; |
| 106 | |
| 107 | str= adns__alloc_interim(pai->qu, l+1); |
| 108 | if (!str) R_NOMEM; |
| 109 | |
| 110 | str[l]= 0; |
| 111 | memcpy(str,dgram+cbyte,l); |
| 112 | |
| 113 | *len_r= l; |
| 114 | *str_r= str; |
| 115 | *cbyte_io= cbyte+l; |
| 116 | |
| 117 | return adns_s_ok; |
| 118 | } |
| 119 | |
| 120 | static adns_status csp_qstring(vbuf *vb, const char *dp, int len) { |
| 121 | unsigned char ch; |
| 122 | char buf[10]; |
| 123 | int cn; |
| 124 | |
| 125 | CSP_ADDSTR("\""); |
| 126 | for (cn=0; cn<len; cn++) { |
| 127 | ch= *dp++; |
| 128 | if (ch == '\\') { |
| 129 | CSP_ADDSTR("\\\\"); |
| 130 | } else if (ch == '"') { |
| 131 | CSP_ADDSTR("\\\""); |
| 132 | } else if (ch >= 32 && ch <= 126) { |
| 133 | if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM; |
| 134 | } else { |
| 135 | sprintf(buf,"\\x%02x",ch); |
| 136 | CSP_ADDSTR(buf); |
| 137 | } |
| 138 | } |
| 139 | CSP_ADDSTR("\""); |
| 140 | |
| 141 | return adns_s_ok; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * _str (mf) |
| 146 | */ |
| 147 | |
| 148 | static void mf_str(adns_query qu, void *datap) { |
| 149 | char **rrp= datap; |
| 150 | |
| 151 | adns__makefinal_str(qu,rrp); |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * _intstr (mf) |
| 156 | */ |
| 157 | |
| 158 | static void mf_intstr(adns_query qu, void *datap) { |
| 159 | adns_rr_intstr *rrp= datap; |
| 160 | |
| 161 | adns__makefinal_str(qu,&rrp->str); |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * _manyistr (mf) |
| 166 | */ |
| 167 | |
| 168 | static void mf_manyistr(adns_query qu, void *datap) { |
| 169 | adns_rr_intstr **rrp= datap; |
| 170 | adns_rr_intstr *te, *table; |
| 171 | void *tablev; |
| 172 | int tc; |
| 173 | |
| 174 | for (tc=0, te= *rrp; te->i >= 0; te++, tc++); |
| 175 | tablev= *rrp; |
| 176 | adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1)); |
| 177 | *rrp= table= tablev; |
| 178 | for (te= *rrp; te->i >= 0; te++) |
| 179 | adns__makefinal_str(qu,&te->str); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * _txt (pa,cs) |
| 184 | */ |
| 185 | |
| 186 | static adns_status pa_txt(const parseinfo *pai, int cbyte, |
| 187 | int max, void *datap) { |
| 188 | adns_rr_intstr **rrp= datap, *table, *te; |
| 189 | const byte *dgram= pai->dgram; |
| 190 | int ti, tc, l, startbyte; |
| 191 | adns_status st; |
| 192 | |
| 193 | startbyte= cbyte; |
| 194 | if (cbyte >= max) return adns_s_invaliddata; |
| 195 | tc= 0; |
| 196 | while (cbyte < max) { |
| 197 | GET_B(cbyte,l); |
| 198 | cbyte+= l; |
| 199 | tc++; |
| 200 | } |
| 201 | if (cbyte != max || !tc) return adns_s_invaliddata; |
| 202 | |
| 203 | table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1)); |
| 204 | if (!table) R_NOMEM; |
| 205 | |
| 206 | for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) { |
| 207 | st= pap_qstring(pai, &cbyte, max, &te->i, &te->str); |
| 208 | if (st) return st; |
| 209 | } |
| 210 | assert(cbyte == max); |
| 211 | |
| 212 | te->i= -1; |
| 213 | te->str= 0; |
| 214 | |
| 215 | *rrp= table; |
| 216 | return adns_s_ok; |
| 217 | } |
| 218 | |
| 219 | static adns_status cs_txt(vbuf *vb, const void *datap) { |
| 220 | const adns_rr_intstr *const *rrp= datap; |
| 221 | const adns_rr_intstr *current; |
| 222 | adns_status st; |
| 223 | int spc; |
| 224 | |
| 225 | for (current= *rrp, spc=0; current->i >= 0; current++, spc=1) { |
| 226 | if (spc) CSP_ADDSTR(" "); |
| 227 | st= csp_qstring(vb,current->str,current->i); if (st) return st; |
| 228 | } |
| 229 | return adns_s_ok; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * _hinfo (cs) |
| 234 | */ |
| 235 | |
| 236 | static adns_status cs_hinfo(vbuf *vb, const void *datap) { |
| 237 | const adns_rr_intstrpair *rrp= datap; |
| 238 | adns_status st; |
| 239 | |
| 240 | st= csp_qstring(vb,rrp->array[0].str,rrp->array[0].i); if (st) return st; |
| 241 | CSP_ADDSTR(" "); |
| 242 | st= csp_qstring(vb,rrp->array[1].str,rrp->array[1].i); if (st) return st; |
| 243 | return adns_s_ok; |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * _inaddr (pa,di,cs +search_sortlist, dip_genaddr) |
| 248 | */ |
| 249 | |
| 250 | static adns_status pa_inaddr(const parseinfo *pai, int cbyte, |
| 251 | int max, void *datap) { |
| 252 | struct in_addr *storeto= datap; |
| 253 | |
| 254 | if (max-cbyte != 4) return adns_s_invaliddata; |
| 255 | memcpy(storeto, pai->dgram + cbyte, 4); |
| 256 | return adns_s_ok; |
| 257 | } |
| 258 | |
| 259 | static int search_sortlist(adns_state ads, int af, const void *ad) { |
| 260 | const struct sortlist *slp; |
| 261 | int i; |
| 262 | |
| 263 | for (i=0, slp=ads->sortlist; |
| 264 | i<ads->nsortlist && |
| 265 | !adns__addr_match_p(af,ad, slp->af,&slp->base,&slp->mask); |
| 266 | i++, slp++); |
| 267 | return i; |
| 268 | } |
| 269 | |
| 270 | static int dip_genaddr(adns_state ads, int af, const void *a, const void *b) { |
| 271 | int ai, bi; |
| 272 | |
| 273 | if (!ads->nsortlist) return 0; |
| 274 | |
| 275 | ai= search_sortlist(ads,af,a); |
| 276 | bi= search_sortlist(ads,af,b); |
| 277 | return bi<ai; |
| 278 | } |
| 279 | |
| 280 | static int di_inaddr(adns_state ads, |
| 281 | const void *datap_a, const void *datap_b) { |
| 282 | return dip_genaddr(ads,AF_INET,datap_a,datap_b); |
| 283 | } |
| 284 | |
| 285 | static adns_status cs_inaddr(vbuf *vb, const void *datap) { |
| 286 | const struct in_addr *rrp= datap, rr= *rrp; |
| 287 | const char *ia; |
| 288 | |
| 289 | ia= inet_ntoa(rr); assert(ia); |
| 290 | CSP_ADDSTR(ia); |
| 291 | return adns_s_ok; |
| 292 | } |
| 293 | |
| 294 | /* |
| 295 | * _addr (pa,di,div,csp,cs,gsz +search_sortlist_sa, dip_sockaddr) |
| 296 | */ |
| 297 | |
| 298 | static adns_status pa_addr(const parseinfo *pai, int cbyte, |
| 299 | int max, void *datap) { |
| 300 | adns_rr_addr *storeto= datap; |
| 301 | const byte *dgram= pai->dgram; |
| 302 | |
| 303 | if (max-cbyte != 4) return adns_s_invaliddata; |
| 304 | storeto->len= sizeof(storeto->addr.inet); |
| 305 | memset(&storeto->addr,0,sizeof(storeto->addr.inet)); |
| 306 | storeto->addr.inet.sin_family= AF_INET; |
| 307 | memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4); |
| 308 | return adns_s_ok; |
| 309 | } |
| 310 | |
| 311 | static int search_sortlist_sa(adns_state ads, const struct sockaddr *sa) { |
| 312 | union gen_addr a; |
| 313 | adns__sockaddr_extract(sa, &a, 0); |
| 314 | return search_sortlist(ads, sa->sa_family, &a); |
| 315 | } |
| 316 | |
| 317 | static int dip_sockaddr(adns_state ads, |
| 318 | const struct sockaddr *sa, |
| 319 | const struct sockaddr *sb) { |
| 320 | if (!ads->sortlist) return 0; |
| 321 | return search_sortlist_sa(ads, sa) > search_sortlist_sa(ads, sb); |
| 322 | } |
| 323 | |
| 324 | static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) { |
| 325 | const adns_rr_addr *ap= datap_a, *bp= datap_b; |
| 326 | return dip_sockaddr(ads, &ap->addr.sa, &bp->addr.sa); |
| 327 | } |
| 328 | |
| 329 | static int div_addr(void *context, const void *datap_a, const void *datap_b) { |
| 330 | const adns_state ads= context; |
| 331 | |
| 332 | return di_addr(ads, datap_a, datap_b); |
| 333 | } |
| 334 | |
| 335 | static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) { |
| 336 | const char *ia; |
| 337 | char buf[30]; |
| 338 | |
| 339 | switch (rrp->addr.inet.sin_family) { |
| 340 | case AF_INET: |
| 341 | CSP_ADDSTR("INET "); |
| 342 | ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia); |
| 343 | CSP_ADDSTR(ia); |
| 344 | break; |
| 345 | default: |
| 346 | sprintf(buf,"AF=%u",rrp->addr.sa.sa_family); |
| 347 | CSP_ADDSTR(buf); |
| 348 | break; |
| 349 | } |
| 350 | return adns_s_ok; |
| 351 | } |
| 352 | |
| 353 | static adns_status cs_addr(vbuf *vb, const void *datap) { |
| 354 | const adns_rr_addr *rrp= datap; |
| 355 | |
| 356 | return csp_addr(vb,rrp); |
| 357 | } |
| 358 | |
| 359 | static int gsz_addr(const typeinfo *typei, adns_rrtype type) { |
| 360 | return type & adns__qtf_bigaddr ? |
| 361 | sizeof(adns_rr_addr) : sizeof(adns_rr_addr_v4only); |
| 362 | } |
| 363 | |
| 364 | /* |
| 365 | * _domain (pap,csp,cs) |
| 366 | * _dom_raw (pa) |
| 367 | */ |
| 368 | |
| 369 | static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max, |
| 370 | char **domain_r, parsedomain_flags flags) { |
| 371 | adns_status st; |
| 372 | char *dm; |
| 373 | |
| 374 | st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags, |
| 375 | pai->dgram,pai->dglen, cbyte_io, max); |
| 376 | if (st) return st; |
| 377 | if (!pai->qu->vb.used) return adns_s_invaliddata; |
| 378 | |
| 379 | dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1); |
| 380 | if (!dm) R_NOMEM; |
| 381 | |
| 382 | dm[pai->qu->vb.used]= 0; |
| 383 | memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used); |
| 384 | |
| 385 | *domain_r= dm; |
| 386 | return adns_s_ok; |
| 387 | } |
| 388 | |
| 389 | static adns_status csp_domain(vbuf *vb, const char *domain) { |
| 390 | CSP_ADDSTR(domain); |
| 391 | if (!*domain) CSP_ADDSTR("."); |
| 392 | return adns_s_ok; |
| 393 | } |
| 394 | |
| 395 | static adns_status cs_domain(vbuf *vb, const void *datap) { |
| 396 | const char *const *domainp= datap; |
| 397 | return csp_domain(vb,*domainp); |
| 398 | } |
| 399 | |
| 400 | static adns_status pa_dom_raw(const parseinfo *pai, int cbyte, |
| 401 | int max, void *datap) { |
| 402 | char **rrp= datap; |
| 403 | adns_status st; |
| 404 | |
| 405 | st= pap_domain(pai, &cbyte, max, rrp, pdf_quoteok); |
| 406 | if (st) return st; |
| 407 | |
| 408 | if (cbyte != max) return adns_s_invaliddata; |
| 409 | return adns_s_ok; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * _host_raw (pa) |
| 414 | */ |
| 415 | |
| 416 | static adns_status pa_host_raw(const parseinfo *pai, int cbyte, |
| 417 | int max, void *datap) { |
| 418 | char **rrp= datap; |
| 419 | adns_status st; |
| 420 | |
| 421 | st= pap_domain(pai, &cbyte, max, rrp, |
| 422 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 423 | if (st) return st; |
| 424 | |
| 425 | if (cbyte != max) return adns_s_invaliddata; |
| 426 | return adns_s_ok; |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs, icb_hostaddr) |
| 431 | */ |
| 432 | |
| 433 | static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha, |
| 434 | size_t addrsz, |
| 435 | int *cbyte_io, int count, int dmstart) { |
| 436 | int rri, naddrs; |
| 437 | int type, class, rdlen, rdstart, ownermatched; |
| 438 | unsigned long ttl; |
| 439 | adns_status st; |
| 440 | |
| 441 | for (rri=0, naddrs=-1; rri<count; rri++) { |
| 442 | st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram, |
| 443 | pai->dglen, cbyte_io, |
| 444 | &type, &class, &ttl, &rdlen, &rdstart, |
| 445 | pai->dgram, pai->dglen, dmstart, &ownermatched); |
| 446 | if (st) return st; |
| 447 | if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) { |
| 448 | if (naddrs>0) break; else continue; |
| 449 | } |
| 450 | if (naddrs == -1) { |
| 451 | naddrs= 0; |
| 452 | } |
| 453 | if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*addrsz)) |
| 454 | R_NOMEM; |
| 455 | adns__update_expires(pai->qu,ttl,pai->now); |
| 456 | st= pa_addr(pai, rdstart,rdstart+rdlen, pai->qu->vb.buf + naddrs*addrsz); |
| 457 | if (st) return st; |
| 458 | naddrs++; |
| 459 | } |
| 460 | if (naddrs >= 0) { |
| 461 | ha->addrs= adns__alloc_interim(pai->qu, naddrs*addrsz); |
| 462 | if (!ha->addrs) R_NOMEM; |
| 463 | memcpy(ha->addrs, pai->qu->vb.buf, naddrs*addrsz); |
| 464 | ha->naddrs= naddrs; |
| 465 | ha->astatus= adns_s_ok; |
| 466 | |
| 467 | adns__isort(ha->addrs, naddrs, addrsz, pai->qu->vb.buf, |
| 468 | div_addr, pai->ads); |
| 469 | } |
| 470 | return adns_s_ok; |
| 471 | } |
| 472 | |
| 473 | static void icb_hostaddr(adns_query parent, adns_query child) { |
| 474 | adns_answer *cans= child->answer; |
| 475 | adns_rr_hostaddr *rrp= child->ctx.pinfo.hostaddr; |
| 476 | adns_state ads= parent->ads; |
| 477 | adns_status st; |
| 478 | size_t addrsz= gsz_addr(0, parent->answer->type); |
| 479 | |
| 480 | st= cans->status; |
| 481 | rrp->astatus= st; |
| 482 | rrp->naddrs= (st>0 && st<=adns_s_max_tempfail) ? -1 : cans->nrrs; |
| 483 | rrp->addrs= cans->rrs.addr; |
| 484 | adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*addrsz); |
| 485 | |
| 486 | if (parent->children.head) { |
| 487 | LIST_LINK_TAIL(ads->childw,parent); |
| 488 | } else { |
| 489 | adns__query_done(parent); |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io, |
| 494 | int max, adns_rr_hostaddr *rrp) { |
| 495 | adns_status st; |
| 496 | int dmstart, cbyte; |
| 497 | qcontext ctx; |
| 498 | int id; |
| 499 | adns_query nqu; |
| 500 | adns_queryflags nflags; |
| 501 | size_t addrsz= gsz_addr(0, pai->qu->answer->type); |
| 502 | |
| 503 | dmstart= cbyte= *cbyte_io; |
| 504 | st= pap_domain(pai, &cbyte, max, &rrp->host, |
| 505 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 506 | if (st) return st; |
| 507 | *cbyte_io= cbyte; |
| 508 | |
| 509 | rrp->astatus= adns_s_ok; |
| 510 | rrp->naddrs= -1; |
| 511 | rrp->addrs= 0; |
| 512 | |
| 513 | cbyte= pai->nsstart; |
| 514 | |
| 515 | st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->nscount, dmstart); |
| 516 | if (st) return st; |
| 517 | if (rrp->naddrs != -1) return adns_s_ok; |
| 518 | |
| 519 | st= pap_findaddrs(pai, rrp,addrsz, &cbyte, pai->arcount, dmstart); |
| 520 | if (st) return st; |
| 521 | if (rrp->naddrs != -1) return adns_s_ok; |
| 522 | |
| 523 | st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id, |
| 524 | pai->dgram, pai->dglen, dmstart, |
| 525 | adns_r_addr, adns_qf_quoteok_query); |
| 526 | if (st) return st; |
| 527 | |
| 528 | ctx.ext= 0; |
| 529 | ctx.callback= icb_hostaddr; |
| 530 | ctx.pinfo.hostaddr= rrp; |
| 531 | memset(&ctx.tinfo, 0, sizeof(ctx.tinfo)); |
| 532 | |
| 533 | nflags= adns_qf_quoteok_query; |
| 534 | if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid; |
| 535 | |
| 536 | st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr), |
| 537 | ((adns_r_addr & adns_rrt_reprmask) | |
| 538 | (pai->qu->answer->type & ~adns_rrt_reprmask)), |
| 539 | &pai->qu->vb, id, nflags, pai->now, &ctx); |
| 540 | if (st) return st; |
| 541 | |
| 542 | nqu->parent= pai->qu; |
| 543 | LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.); |
| 544 | |
| 545 | return adns_s_ok; |
| 546 | } |
| 547 | |
| 548 | static adns_status pa_hostaddr(const parseinfo *pai, int cbyte, |
| 549 | int max, void *datap) { |
| 550 | adns_rr_hostaddr *rrp= datap; |
| 551 | adns_status st; |
| 552 | |
| 553 | st= pap_hostaddr(pai, &cbyte, max, rrp); |
| 554 | if (st) return st; |
| 555 | if (cbyte != max) return adns_s_invaliddata; |
| 556 | |
| 557 | return adns_s_ok; |
| 558 | } |
| 559 | |
| 560 | static int dip_hostaddr(adns_state ads, |
| 561 | const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) { |
| 562 | if (ap->astatus != bp->astatus) return ap->astatus; |
| 563 | if (ap->astatus) return 0; |
| 564 | |
| 565 | return dip_sockaddr(ads, &ap->addrs[0].addr.sa, &bp->addrs[0].addr.sa); |
| 566 | } |
| 567 | |
| 568 | static int di_hostaddr(adns_state ads, |
| 569 | const void *datap_a, const void *datap_b) { |
| 570 | const adns_rr_hostaddr *ap= datap_a, *bp= datap_b; |
| 571 | |
| 572 | return dip_hostaddr(ads, ap,bp); |
| 573 | } |
| 574 | |
| 575 | static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) { |
| 576 | void *tablev; |
| 577 | size_t addrsz= gsz_addr(0, qu->answer->type); |
| 578 | |
| 579 | adns__makefinal_str(qu,&rrp->host); |
| 580 | tablev= rrp->addrs; |
| 581 | adns__makefinal_block(qu, &tablev, rrp->naddrs*addrsz); |
| 582 | rrp->addrs= tablev; |
| 583 | } |
| 584 | |
| 585 | static void mf_hostaddr(adns_query qu, void *datap) { |
| 586 | adns_rr_hostaddr *rrp= datap; |
| 587 | |
| 588 | mfp_hostaddr(qu,rrp); |
| 589 | } |
| 590 | |
| 591 | static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) { |
| 592 | const char *errstr; |
| 593 | adns_status st; |
| 594 | char buf[20]; |
| 595 | int i; |
| 596 | |
| 597 | st= csp_domain(vb,rrp->host); if (st) return st; |
| 598 | |
| 599 | CSP_ADDSTR(" "); |
| 600 | CSP_ADDSTR(adns_errtypeabbrev(rrp->astatus)); |
| 601 | |
| 602 | sprintf(buf," %d ",rrp->astatus); |
| 603 | CSP_ADDSTR(buf); |
| 604 | |
| 605 | CSP_ADDSTR(adns_errabbrev(rrp->astatus)); |
| 606 | CSP_ADDSTR(" "); |
| 607 | |
| 608 | errstr= adns_strerror(rrp->astatus); |
| 609 | st= csp_qstring(vb,errstr,strlen(errstr)); if (st) return st; |
| 610 | |
| 611 | if (rrp->naddrs >= 0) { |
| 612 | CSP_ADDSTR(" ("); |
| 613 | for (i=0; i<rrp->naddrs; i++) { |
| 614 | CSP_ADDSTR(" "); |
| 615 | st= csp_addr(vb,&rrp->addrs[i]); |
| 616 | } |
| 617 | CSP_ADDSTR(" )"); |
| 618 | } else { |
| 619 | CSP_ADDSTR(" ?"); |
| 620 | } |
| 621 | return adns_s_ok; |
| 622 | } |
| 623 | |
| 624 | static adns_status cs_hostaddr(vbuf *vb, const void *datap) { |
| 625 | const adns_rr_hostaddr *rrp= datap; |
| 626 | |
| 627 | return csp_hostaddr(vb,rrp); |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * _mx_raw (pa,di) |
| 632 | */ |
| 633 | |
| 634 | static adns_status pa_mx_raw(const parseinfo *pai, int cbyte, |
| 635 | int max, void *datap) { |
| 636 | const byte *dgram= pai->dgram; |
| 637 | adns_rr_intstr *rrp= datap; |
| 638 | adns_status st; |
| 639 | int pref; |
| 640 | |
| 641 | if (cbyte+2 > max) return adns_s_invaliddata; |
| 642 | GET_W(cbyte,pref); |
| 643 | rrp->i= pref; |
| 644 | st= pap_domain(pai, &cbyte, max, &rrp->str, |
| 645 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 646 | if (st) return st; |
| 647 | |
| 648 | if (cbyte != max) return adns_s_invaliddata; |
| 649 | return adns_s_ok; |
| 650 | } |
| 651 | |
| 652 | static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) { |
| 653 | const adns_rr_intstr *ap= datap_a, *bp= datap_b; |
| 654 | |
| 655 | if (ap->i < bp->i) return 0; |
| 656 | if (ap->i > bp->i) return 1; |
| 657 | return 0; |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * _mx (pa,di) |
| 662 | */ |
| 663 | |
| 664 | static adns_status pa_mx(const parseinfo *pai, int cbyte, |
| 665 | int max, void *datap) { |
| 666 | const byte *dgram= pai->dgram; |
| 667 | adns_rr_inthostaddr *rrp= datap; |
| 668 | adns_status st; |
| 669 | int pref; |
| 670 | |
| 671 | if (cbyte+2 > max) return adns_s_invaliddata; |
| 672 | GET_W(cbyte,pref); |
| 673 | rrp->i= pref; |
| 674 | st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); |
| 675 | if (st) return st; |
| 676 | |
| 677 | if (cbyte != max) return adns_s_invaliddata; |
| 678 | return adns_s_ok; |
| 679 | } |
| 680 | |
| 681 | static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) { |
| 682 | const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b; |
| 683 | |
| 684 | if (ap->i < bp->i) return 0; |
| 685 | if (ap->i > bp->i) return 1; |
| 686 | return dip_hostaddr(ads, &ap->ha, &bp->ha); |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * _inthostaddr (mf,cs) |
| 691 | */ |
| 692 | |
| 693 | static void mf_inthostaddr(adns_query qu, void *datap) { |
| 694 | adns_rr_inthostaddr *rrp= datap; |
| 695 | |
| 696 | mfp_hostaddr(qu,&rrp->ha); |
| 697 | } |
| 698 | |
| 699 | static adns_status cs_inthostaddr(vbuf *vb, const void *datap) { |
| 700 | const adns_rr_inthostaddr *rrp= datap; |
| 701 | char buf[10]; |
| 702 | |
| 703 | sprintf(buf,"%u ",rrp->i); |
| 704 | CSP_ADDSTR(buf); |
| 705 | |
| 706 | return csp_hostaddr(vb,&rrp->ha); |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * _inthost (cs) |
| 711 | */ |
| 712 | |
| 713 | static adns_status cs_inthost(vbuf *vb, const void *datap) { |
| 714 | const adns_rr_intstr *rrp= datap; |
| 715 | char buf[10]; |
| 716 | |
| 717 | sprintf(buf,"%u ",rrp->i); |
| 718 | CSP_ADDSTR(buf); |
| 719 | return csp_domain(vb,rrp->str); |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * _ptr (ckl,pa +icb_ptr) |
| 724 | */ |
| 725 | |
| 726 | static adns_status ckl_ptr(adns_state ads, adns_queryflags flags, |
| 727 | union checklabel_state *cls, qcontext *ctx, |
| 728 | int labnum, const char *label, int lablen) { |
| 729 | static const char *const (expectdomain[])= { DNS_INADDR_ARPA }; |
| 730 | char *ep; |
| 731 | const char *ed; |
| 732 | char labbuf[4]; |
| 733 | int l; |
| 734 | |
| 735 | if (labnum < 4) { |
| 736 | if (lablen<=0 || lablen>3) return adns_s_querydomainwrong; |
| 737 | memcpy(labbuf, label, lablen); |
| 738 | labbuf[lablen]= 0; |
| 739 | cls->ptr.ipv[3-labnum]= strtoul(labbuf,&ep,10); |
| 740 | if (*ep) return adns_s_querydomainwrong; |
| 741 | if (lablen>1 && *label=='0') return adns_s_querydomainwrong; |
| 742 | } else if (labnum < 4 + sizeof(expectdomain)/sizeof(*expectdomain)) { |
| 743 | ed= expectdomain[labnum-4]; |
| 744 | l= strlen(ed); |
| 745 | if (lablen != l || memcmp(label, ed, l)) return adns_s_querydomainwrong; |
| 746 | } else { |
| 747 | if (lablen) return adns_s_querydomainwrong; |
| 748 | ctx->tinfo.ptr.addr.af= AF_INET; |
| 749 | ctx->tinfo.ptr.addr.addr.v4.s_addr= |
| 750 | htonl((cls->ptr.ipv[0]<<24) | (cls->ptr.ipv[1]<<16) | |
| 751 | (cls->ptr.ipv[2]<< 8) | (cls->ptr.ipv[3])); |
| 752 | } |
| 753 | return adns_s_ok; |
| 754 | } |
| 755 | |
| 756 | static void icb_ptr(adns_query parent, adns_query child) { |
| 757 | adns_answer *cans= child->answer; |
| 758 | const struct af_addr *queried; |
| 759 | const unsigned char *found; |
| 760 | adns_state ads= parent->ads; |
| 761 | int i; |
| 762 | |
| 763 | if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) { |
| 764 | adns__query_fail(parent,adns_s_inconsistent); |
| 765 | return; |
| 766 | } else if (cans->status) { |
| 767 | adns__query_fail(parent,cans->status); |
| 768 | return; |
| 769 | } |
| 770 | |
| 771 | queried= &parent->ctx.tinfo.ptr.addr; |
| 772 | assert(cans->type == adns_r_a); |
| 773 | for (i=0, found=cans->rrs.bytes; i<cans->nrrs; i++, found+=cans->rrsz) { |
| 774 | if (adns__genaddr_equal_p(queried->af,&queried->addr, AF_INET,found)) { |
| 775 | if (!parent->children.head) { |
| 776 | adns__query_done(parent); |
| 777 | return; |
| 778 | } else { |
| 779 | LIST_LINK_TAIL(ads->childw,parent); |
| 780 | return; |
| 781 | } |
| 782 | } |
| 783 | } |
| 784 | |
| 785 | adns__query_fail(parent,adns_s_inconsistent); |
| 786 | } |
| 787 | |
| 788 | static adns_status pa_ptr(const parseinfo *pai, int dmstart, |
| 789 | int max, void *datap) { |
| 790 | char **rrp= datap; |
| 791 | adns_status st; |
| 792 | int cbyte, id; |
| 793 | adns_query nqu; |
| 794 | qcontext ctx; |
| 795 | |
| 796 | cbyte= dmstart; |
| 797 | st= pap_domain(pai, &cbyte, max, rrp, |
| 798 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 799 | if (st) return st; |
| 800 | if (cbyte != max) return adns_s_invaliddata; |
| 801 | |
| 802 | st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id, |
| 803 | pai->dgram, pai->dglen, dmstart, |
| 804 | adns_r_a, adns_qf_quoteok_query); |
| 805 | if (st) return st; |
| 806 | |
| 807 | ctx.ext= 0; |
| 808 | ctx.callback= icb_ptr; |
| 809 | memset(&ctx.pinfo,0,sizeof(ctx.pinfo)); |
| 810 | memset(&ctx.tinfo,0,sizeof(ctx.tinfo)); |
| 811 | st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_a), |
| 812 | adns_r_a, &pai->qu->vb, id, adns_qf_quoteok_query, |
| 813 | pai->now, &ctx); |
| 814 | if (st) return st; |
| 815 | |
| 816 | nqu->parent= pai->qu; |
| 817 | LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.); |
| 818 | return adns_s_ok; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * _strpair (mf) |
| 823 | */ |
| 824 | |
| 825 | static void mf_strpair(adns_query qu, void *datap) { |
| 826 | adns_rr_strpair *rrp= datap; |
| 827 | |
| 828 | adns__makefinal_str(qu,&rrp->array[0]); |
| 829 | adns__makefinal_str(qu,&rrp->array[1]); |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * _intstrpair (mf) |
| 834 | */ |
| 835 | |
| 836 | static void mf_intstrpair(adns_query qu, void *datap) { |
| 837 | adns_rr_intstrpair *rrp= datap; |
| 838 | |
| 839 | adns__makefinal_str(qu,&rrp->array[0].str); |
| 840 | adns__makefinal_str(qu,&rrp->array[1].str); |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * _hinfo (pa) |
| 845 | */ |
| 846 | |
| 847 | static adns_status pa_hinfo(const parseinfo *pai, int cbyte, |
| 848 | int max, void *datap) { |
| 849 | adns_rr_intstrpair *rrp= datap; |
| 850 | adns_status st; |
| 851 | int i; |
| 852 | |
| 853 | for (i=0; i<2; i++) { |
| 854 | st= pap_qstring(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str); |
| 855 | if (st) return st; |
| 856 | } |
| 857 | |
| 858 | if (cbyte != max) return adns_s_invaliddata; |
| 859 | |
| 860 | return adns_s_ok; |
| 861 | } |
| 862 | |
| 863 | /* |
| 864 | * _mailbox (pap,cs +pap_mailbox822) |
| 865 | */ |
| 866 | |
| 867 | static adns_status pap_mailbox822(const parseinfo *pai, |
| 868 | int *cbyte_io, int max, char **mb_r) { |
| 869 | int lablen, labstart, i, needquote, c, r, neednorm; |
| 870 | const unsigned char *p; |
| 871 | char *str; |
| 872 | findlabel_state fls; |
| 873 | adns_status st; |
| 874 | vbuf *vb; |
| 875 | |
| 876 | vb= &pai->qu->vb; |
| 877 | vb->used= 0; |
| 878 | adns__findlabel_start(&fls, pai->ads, |
| 879 | -1, pai->qu, |
| 880 | pai->dgram, pai->dglen, max, |
| 881 | *cbyte_io, cbyte_io); |
| 882 | st= adns__findlabel_next(&fls,&lablen,&labstart); |
| 883 | if (!lablen) { |
| 884 | adns__vbuf_appendstr(vb,"."); |
| 885 | goto x_ok; |
| 886 | } |
| 887 | |
| 888 | neednorm= 1; |
| 889 | for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) { |
| 890 | c= *p++; |
| 891 | if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata; |
| 892 | if (c == '.' && !neednorm) neednorm= 1; |
| 893 | else if (c==' ' || c>=127 || ctype_822special(c)) needquote++; |
| 894 | else neednorm= 0; |
| 895 | } |
| 896 | |
| 897 | if (needquote || neednorm) { |
| 898 | r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM; |
| 899 | adns__vbuf_appendq(vb,"\"",1); |
| 900 | for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) { |
| 901 | c= *p; |
| 902 | if (c == '"' || c=='\\') adns__vbuf_appendq(vb,"\\",1); |
| 903 | adns__vbuf_appendq(vb,p,1); |
| 904 | } |
| 905 | adns__vbuf_appendq(vb,"\"",1); |
| 906 | } else { |
| 907 | r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM; |
| 908 | } |
| 909 | |
| 910 | r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM; |
| 911 | |
| 912 | st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram); |
| 913 | if (st) return st; |
| 914 | |
| 915 | x_ok: |
| 916 | str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM; |
| 917 | memcpy(str,vb->buf,vb->used); |
| 918 | str[vb->used]= 0; |
| 919 | *mb_r= str; |
| 920 | return adns_s_ok; |
| 921 | } |
| 922 | |
| 923 | static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max, |
| 924 | char **mb_r) { |
| 925 | if (pai->qu->typei->typekey & adns__qtf_mail822) { |
| 926 | return pap_mailbox822(pai, cbyte_io, max, mb_r); |
| 927 | } else { |
| 928 | return pap_domain(pai, cbyte_io, max, mb_r, pdf_quoteok); |
| 929 | } |
| 930 | } |
| 931 | |
| 932 | static adns_status csp_mailbox(vbuf *vb, const char *mailbox) { |
| 933 | return csp_domain(vb,mailbox); |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * _rp (pa,cs) |
| 938 | */ |
| 939 | |
| 940 | static adns_status pa_rp(const parseinfo *pai, int cbyte, |
| 941 | int max, void *datap) { |
| 942 | adns_rr_strpair *rrp= datap; |
| 943 | adns_status st; |
| 944 | |
| 945 | st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]); |
| 946 | if (st) return st; |
| 947 | |
| 948 | st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok); |
| 949 | if (st) return st; |
| 950 | |
| 951 | if (cbyte != max) return adns_s_invaliddata; |
| 952 | return adns_s_ok; |
| 953 | } |
| 954 | |
| 955 | static adns_status cs_rp(vbuf *vb, const void *datap) { |
| 956 | const adns_rr_strpair *rrp= datap; |
| 957 | adns_status st; |
| 958 | |
| 959 | st= csp_mailbox(vb,rrp->array[0]); if (st) return st; |
| 960 | CSP_ADDSTR(" "); |
| 961 | st= csp_domain(vb,rrp->array[1]); if (st) return st; |
| 962 | |
| 963 | return adns_s_ok; |
| 964 | } |
| 965 | |
| 966 | /* |
| 967 | * _soa (pa,mf,cs) |
| 968 | */ |
| 969 | |
| 970 | static adns_status pa_soa(const parseinfo *pai, int cbyte, |
| 971 | int max, void *datap) { |
| 972 | adns_rr_soa *rrp= datap; |
| 973 | const byte *dgram= pai->dgram; |
| 974 | adns_status st; |
| 975 | int msw, lsw, i; |
| 976 | |
| 977 | st= pap_domain(pai, &cbyte, max, &rrp->mname, |
| 978 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 979 | if (st) return st; |
| 980 | |
| 981 | st= pap_mailbox(pai, &cbyte, max, &rrp->rname); |
| 982 | if (st) return st; |
| 983 | |
| 984 | if (cbyte+20 != max) return adns_s_invaliddata; |
| 985 | |
| 986 | for (i=0; i<5; i++) { |
| 987 | GET_W(cbyte,msw); |
| 988 | GET_W(cbyte,lsw); |
| 989 | (&rrp->serial)[i]= (msw<<16) | lsw; |
| 990 | } |
| 991 | |
| 992 | return adns_s_ok; |
| 993 | } |
| 994 | |
| 995 | static void mf_soa(adns_query qu, void *datap) { |
| 996 | adns_rr_soa *rrp= datap; |
| 997 | |
| 998 | adns__makefinal_str(qu,&rrp->mname); |
| 999 | adns__makefinal_str(qu,&rrp->rname); |
| 1000 | } |
| 1001 | |
| 1002 | static adns_status cs_soa(vbuf *vb, const void *datap) { |
| 1003 | const adns_rr_soa *rrp= datap; |
| 1004 | char buf[20]; |
| 1005 | int i; |
| 1006 | adns_status st; |
| 1007 | |
| 1008 | st= csp_domain(vb,rrp->mname); if (st) return st; |
| 1009 | CSP_ADDSTR(" "); |
| 1010 | st= csp_mailbox(vb,rrp->rname); if (st) return st; |
| 1011 | |
| 1012 | for (i=0; i<5; i++) { |
| 1013 | sprintf(buf," %lu",(&rrp->serial)[i]); |
| 1014 | CSP_ADDSTR(buf); |
| 1015 | } |
| 1016 | |
| 1017 | return adns_s_ok; |
| 1018 | } |
| 1019 | |
| 1020 | /* |
| 1021 | * _srv* (ckl,(pap),pa*2,mf*2,di,(csp),cs*2,postsort) |
| 1022 | */ |
| 1023 | |
| 1024 | static adns_status ckl_srv(adns_state ads, adns_queryflags flags, |
| 1025 | union checklabel_state *cls, qcontext *ctx, |
| 1026 | int labnum, const char *label, int lablen) { |
| 1027 | if (labnum < 2 && !(flags & adns_qf_quoteok_query)) { |
| 1028 | if (!lablen || label[0] != '_') return adns_s_querydomaininvalid; |
| 1029 | return adns_s_ok; |
| 1030 | } |
| 1031 | return adns__ckl_hostname(ads, flags, cls, ctx, labnum, label, lablen); |
| 1032 | } |
| 1033 | |
| 1034 | static adns_status pap_srv_begin(const parseinfo *pai, int *cbyte_io, int max, |
| 1035 | adns_rr_srvha *rrp |
| 1036 | /* might be adns_rr_srvraw* */) { |
| 1037 | const byte *dgram= pai->dgram; |
| 1038 | int ti, cbyte; |
| 1039 | |
| 1040 | cbyte= *cbyte_io; |
| 1041 | if ((*cbyte_io += 6) > max) return adns_s_invaliddata; |
| 1042 | |
| 1043 | rrp->priority= GET_W(cbyte, ti); |
| 1044 | rrp->weight= GET_W(cbyte, ti); |
| 1045 | rrp->port= GET_W(cbyte, ti); |
| 1046 | return adns_s_ok; |
| 1047 | } |
| 1048 | |
| 1049 | static adns_status pa_srvraw(const parseinfo *pai, int cbyte, |
| 1050 | int max, void *datap) { |
| 1051 | adns_rr_srvraw *rrp= datap; |
| 1052 | adns_status st; |
| 1053 | |
| 1054 | st= pap_srv_begin(pai,&cbyte,max,datap); |
| 1055 | if (st) return st; |
| 1056 | |
| 1057 | st= pap_domain(pai, &cbyte, max, &rrp->host, |
| 1058 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 1059 | if (st) return st; |
| 1060 | |
| 1061 | if (cbyte != max) return adns_s_invaliddata; |
| 1062 | return adns_s_ok; |
| 1063 | } |
| 1064 | |
| 1065 | static adns_status pa_srvha(const parseinfo *pai, int cbyte, |
| 1066 | int max, void *datap) { |
| 1067 | adns_rr_srvha *rrp= datap; |
| 1068 | adns_status st; |
| 1069 | |
| 1070 | st= pap_srv_begin(pai,&cbyte,max,datap); if (st) return st; |
| 1071 | st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); if (st) return st; |
| 1072 | if (cbyte != max) return adns_s_invaliddata; |
| 1073 | return adns_s_ok; |
| 1074 | } |
| 1075 | |
| 1076 | static void mf_srvraw(adns_query qu, void *datap) { |
| 1077 | adns_rr_srvraw *rrp= datap; |
| 1078 | adns__makefinal_str(qu, &rrp->host); |
| 1079 | } |
| 1080 | |
| 1081 | static void mf_srvha(adns_query qu, void *datap) { |
| 1082 | adns_rr_srvha *rrp= datap; |
| 1083 | mfp_hostaddr(qu,&rrp->ha); |
| 1084 | } |
| 1085 | |
| 1086 | static int di_srv(adns_state ads, const void *datap_a, const void *datap_b) { |
| 1087 | const adns_rr_srvraw *ap= datap_a, *bp= datap_b; |
| 1088 | /* might be const adns_rr_svhostaddr* */ |
| 1089 | |
| 1090 | if (ap->priority < bp->priority) return 0; |
| 1091 | if (ap->priority > bp->priority) return 1; |
| 1092 | return 0; |
| 1093 | } |
| 1094 | |
| 1095 | static adns_status csp_srv_begin(vbuf *vb, const adns_rr_srvha *rrp |
| 1096 | /* might be adns_rr_srvraw* */) { |
| 1097 | char buf[30]; |
| 1098 | sprintf(buf,"%u %u %u ", rrp->priority, rrp->weight, rrp->port); |
| 1099 | CSP_ADDSTR(buf); |
| 1100 | return adns_s_ok; |
| 1101 | } |
| 1102 | |
| 1103 | static adns_status cs_srvraw(vbuf *vb, const void *datap) { |
| 1104 | const adns_rr_srvraw *rrp= datap; |
| 1105 | adns_status st; |
| 1106 | |
| 1107 | st= csp_srv_begin(vb,(const void*)rrp); if (st) return st; |
| 1108 | return csp_domain(vb,rrp->host); |
| 1109 | } |
| 1110 | |
| 1111 | static adns_status cs_srvha(vbuf *vb, const void *datap) { |
| 1112 | const adns_rr_srvha *rrp= datap; |
| 1113 | adns_status st; |
| 1114 | |
| 1115 | st= csp_srv_begin(vb,(const void*)datap); if (st) return st; |
| 1116 | return csp_hostaddr(vb,&rrp->ha); |
| 1117 | } |
| 1118 | |
| 1119 | static void postsort_srv(adns_state ads, void *array, int nrrs,int rrsz, |
| 1120 | const struct typeinfo *typei) { |
| 1121 | /* we treat everything in the array as if it were an adns_rr_srvha |
| 1122 | * even though the array might be of adns_rr_srvraw. That's OK |
| 1123 | * because they have the same prefix, which is all we access. |
| 1124 | * We use rrsz, too, rather than naive array indexing, of course. |
| 1125 | */ |
| 1126 | char *workbegin, *workend, *search, *arrayend; |
| 1127 | const adns_rr_srvha *rr; |
| 1128 | union { adns_rr_srvha ha; adns_rr_srvraw raw; } rrtmp; |
| 1129 | int cpriority, totalweight, runtotal; |
| 1130 | long randval; |
| 1131 | |
| 1132 | assert(rrsz <= sizeof(rrtmp)); |
| 1133 | for (workbegin= array, arrayend= workbegin + rrsz * nrrs; |
| 1134 | workbegin < arrayend; |
| 1135 | workbegin= workend) { |
| 1136 | cpriority= (rr=(void*)workbegin)->priority; |
| 1137 | |
| 1138 | for (workend= workbegin, totalweight= 0; |
| 1139 | workend < arrayend && (rr=(void*)workend)->priority == cpriority; |
| 1140 | workend += rrsz) { |
| 1141 | totalweight += rr->weight; |
| 1142 | } |
| 1143 | |
| 1144 | /* Now workbegin..(workend-1) incl. are exactly all of the RRs of |
| 1145 | * cpriority. From now on, workbegin points to the `remaining' |
| 1146 | * records: we select one record at a time (RFC2782 `Usage rules' |
| 1147 | * and `Format of the SRV RR' subsection `Weight') to place at |
| 1148 | * workbegin (swapping with the one that was there, and then |
| 1149 | * advance workbegin. */ |
| 1150 | for (; |
| 1151 | workbegin + rrsz < workend; /* don't bother if just one */ |
| 1152 | workbegin += rrsz) { |
| 1153 | |
| 1154 | randval= nrand48(ads->rand48xsubi); |
| 1155 | randval %= (totalweight + 1); |
| 1156 | /* makes it into 0..totalweight inclusive; with 2^10 RRs, |
| 1157 | * totalweight must be <= 2^26 so probability nonuniformity is |
| 1158 | * no worse than 1 in 2^(31-26) ie 1 in 2^5, ie |
| 1159 | * abs(log(P_intended(RR_i) / P_actual(RR_i)) <= log(2^-5). |
| 1160 | */ |
| 1161 | |
| 1162 | for (search=workbegin, runtotal=0; |
| 1163 | (runtotal += (rr=(void*)search)->weight) < randval; |
| 1164 | search += rrsz); |
| 1165 | assert(search < arrayend); |
| 1166 | totalweight -= rr->weight; |
| 1167 | if (search != workbegin) { |
| 1168 | memcpy(&rrtmp, workbegin, rrsz); |
| 1169 | memcpy(workbegin, search, rrsz); |
| 1170 | memcpy(search, &rrtmp, rrsz); |
| 1171 | } |
| 1172 | } |
| 1173 | } |
| 1174 | /* tests: |
| 1175 | * dig -t srv _srv._tcp.test.iwj.relativity.greenend.org.uk. |
| 1176 | * ./adnshost_s -t srv- _sip._udp.voip.net.cam.ac.uk. |
| 1177 | * ./adnshost_s -t srv- _jabber._tcp.jabber.org |
| 1178 | */ |
| 1179 | } |
| 1180 | |
| 1181 | /* |
| 1182 | * _byteblock (mf) |
| 1183 | */ |
| 1184 | |
| 1185 | static void mf_byteblock(adns_query qu, void *datap) { |
| 1186 | adns_rr_byteblock *rrp= datap; |
| 1187 | void *bytes= rrp->data; |
| 1188 | adns__makefinal_block(qu,&bytes,rrp->len); |
| 1189 | rrp->data= bytes; |
| 1190 | } |
| 1191 | |
| 1192 | /* |
| 1193 | * _opaque (pa,cs) |
| 1194 | */ |
| 1195 | |
| 1196 | static adns_status pa_opaque(const parseinfo *pai, int cbyte, |
| 1197 | int max, void *datap) { |
| 1198 | adns_rr_byteblock *rrp= datap; |
| 1199 | |
| 1200 | rrp->len= max - cbyte; |
| 1201 | rrp->data= adns__alloc_interim(pai->qu, rrp->len); |
| 1202 | if (!rrp->data) R_NOMEM; |
| 1203 | memcpy(rrp->data, pai->dgram + cbyte, rrp->len); |
| 1204 | return adns_s_ok; |
| 1205 | } |
| 1206 | |
| 1207 | static adns_status cs_opaque(vbuf *vb, const void *datap) { |
| 1208 | const adns_rr_byteblock *rrp= datap; |
| 1209 | char buf[10]; |
| 1210 | int l; |
| 1211 | unsigned char *p; |
| 1212 | |
| 1213 | sprintf(buf,"\\# %d",rrp->len); |
| 1214 | CSP_ADDSTR(buf); |
| 1215 | |
| 1216 | for (l= rrp->len, p= rrp->data; |
| 1217 | l>=4; |
| 1218 | l -= 4, p += 4) { |
| 1219 | sprintf(buf," %02x%02x%02x%02x",p[0],p[1],p[2],p[3]); |
| 1220 | CSP_ADDSTR(buf); |
| 1221 | } |
| 1222 | for (; |
| 1223 | l>0; |
| 1224 | l--, p++) { |
| 1225 | sprintf(buf," %02x",*p); |
| 1226 | CSP_ADDSTR(buf); |
| 1227 | } |
| 1228 | return adns_s_ok; |
| 1229 | } |
| 1230 | |
| 1231 | /* |
| 1232 | * _flat (mf) |
| 1233 | */ |
| 1234 | |
| 1235 | static void mf_flat(adns_query qu, void *data) { } |
| 1236 | |
| 1237 | /* |
| 1238 | * Now the table. |
| 1239 | */ |
| 1240 | |
| 1241 | #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member)) |
| 1242 | |
| 1243 | #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \ |
| 1244 | { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_##memb, \ |
| 1245 | GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \ |
| 1246 | adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) } |
| 1247 | #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer,/*printer*/...) \ |
| 1248 | { adns_r_##code&adns_rrt_reprmask, rrt,fmt,TYPESZ_M(memb), mf_flat, \ |
| 1249 | GLUE(cs_, CAR(__VA_ARGS__)),pa_##parser,di_##comparer, \ |
| 1250 | adns__ckl_hostname, 0, adns__getrrsz_default, CDR(__VA_ARGS__) } |
| 1251 | |
| 1252 | #define di_0 0 |
| 1253 | |
| 1254 | static const typeinfo typeinfos[] = { |
| 1255 | /* Must be in ascending order of rrtype ! */ |
| 1256 | /* mem-mgmt code rrt fmt member parser comparer printer */ |
| 1257 | |
| 1258 | FLAT_TYPE(a, "A", 0, inaddr, inaddr, inaddr,inaddr ), |
| 1259 | DEEP_TYPE(ns_raw, "NS", "raw",str, host_raw,0, domain ), |
| 1260 | DEEP_TYPE(cname, "CNAME", 0, str, dom_raw, 0, domain ), |
| 1261 | DEEP_TYPE(soa_raw,"SOA", "raw",soa, soa, 0, soa ), |
| 1262 | DEEP_TYPE(ptr_raw,"PTR", "raw",str, host_raw,0, domain ), |
| 1263 | DEEP_TYPE(hinfo, "HINFO", 0, intstrpair,hinfo, 0, hinfo ), |
| 1264 | DEEP_TYPE(mx_raw, "MX", "raw",intstr, mx_raw, mx_raw,inthost ), |
| 1265 | DEEP_TYPE(txt, "TXT", 0, manyistr, txt, 0, txt ), |
| 1266 | DEEP_TYPE(rp_raw, "RP", "raw",strpair, rp, 0, rp ), |
| 1267 | DEEP_TYPE(srv_raw,"SRV", "raw",srvraw , srvraw, srv, srvraw, |
| 1268 | .checklabel= ckl_srv, .postsort= postsort_srv), |
| 1269 | |
| 1270 | FLAT_TYPE(addr, "A", "addr", addr, addr, addr, addr, |
| 1271 | .getrrsz= gsz_addr), |
| 1272 | DEEP_TYPE(ns, "NS", "+addr",hostaddr, hostaddr,hostaddr,hostaddr ), |
| 1273 | DEEP_TYPE(ptr, "PTR","checked",str, ptr, 0, domain, |
| 1274 | .checklabel= ckl_ptr), |
| 1275 | DEEP_TYPE(mx, "MX", "+addr",inthostaddr,mx, mx, inthostaddr, ), |
| 1276 | DEEP_TYPE(srv, "SRV","+addr",srvha, srvha, srv, srvha, |
| 1277 | .checklabel= ckl_srv, .postsort= postsort_srv), |
| 1278 | |
| 1279 | DEEP_TYPE(soa, "SOA","822", soa, soa, 0, soa ), |
| 1280 | DEEP_TYPE(rp, "RP", "822", strpair, rp, 0, rp ), |
| 1281 | }; |
| 1282 | |
| 1283 | static const typeinfo typeinfo_unknown= |
| 1284 | DEEP_TYPE(unknown,0, "unknown",byteblock,opaque, 0, opaque ); |
| 1285 | |
| 1286 | const typeinfo *adns__findtype(adns_rrtype type) { |
| 1287 | const typeinfo *begin, *end, *mid; |
| 1288 | |
| 1289 | if (type & adns_r_unknown) return &typeinfo_unknown; |
| 1290 | type &= adns_rrt_reprmask; |
| 1291 | |
| 1292 | begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo)); |
| 1293 | |
| 1294 | while (begin < end) { |
| 1295 | mid= begin + ((end-begin)>>1); |
| 1296 | if (mid->typekey == type) return mid; |
| 1297 | if (type > mid->typekey) begin= mid+1; |
| 1298 | else end= mid; |
| 1299 | } |
| 1300 | return 0; |
| 1301 | } |