| 1 | /* |
| 2 | * types.c |
| 3 | * - RR-type-specific code, and the machinery to call it |
| 4 | */ |
| 5 | /* |
| 6 | * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2, or (at your option) |
| 11 | * any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software Foundation, |
| 20 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 21 | */ |
| 22 | |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | |
| 26 | #include <arpa/inet.h> |
| 27 | |
| 28 | #include "internal.h" |
| 29 | |
| 30 | #define R_NOMEM return adns_s_nomemory |
| 31 | #define CSP_ADDSTR(s) if (!adns__vbuf_appendstr(vb,(s))) R_NOMEM; else; |
| 32 | |
| 33 | /* |
| 34 | * order of sections: |
| 35 | * |
| 36 | * _string (pap) |
| 37 | * _textdata, _qstring (csp) |
| 38 | * _str (mf,cs) |
| 39 | * _intstr (mf,csp,cs) |
| 40 | * _manyistr (mf,cs) |
| 41 | * _txt (pa) |
| 42 | * _inaddr (pa,dip,di) |
| 43 | * _addr (pa,di,csp,cs) |
| 44 | * _domain (pap) |
| 45 | * _host_raw (pa) |
| 46 | * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +pap_findaddrs) |
| 47 | * _mx_raw (pa,di) |
| 48 | * _mx (pa,di) |
| 49 | * _inthostaddr (mf,cs) |
| 50 | * _ptr (pa) |
| 51 | * _strpair (mf,cs) |
| 52 | * _intstrpair (mf,cs) |
| 53 | * _hinfo (pa) |
| 54 | * _mailbox (pap) |
| 55 | * _rp (pa) |
| 56 | * _soa (pa,mf,cs) |
| 57 | * _flat (mf) |
| 58 | * |
| 59 | * within each section: |
| 60 | * pap_* |
| 61 | * pa_* |
| 62 | * dip_* |
| 63 | * di_* |
| 64 | * mfp_* |
| 65 | * mf_* |
| 66 | * csp_* |
| 67 | * cs_* |
| 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * _string (pap) |
| 72 | * _textdata, _qstring (csp) |
| 73 | */ |
| 74 | |
| 75 | static adns_status pap_string(const parseinfo *pai, int *cbyte_io, int max, |
| 76 | int *len_r, char **str_r) { |
| 77 | /* Neither len_r nor str_r may be null. |
| 78 | * End of datagram (overrun) is indicated by returning adns_s_invaliddata; |
| 79 | */ |
| 80 | const byte *dgram= pai->dgram; |
| 81 | int l, cbyte; |
| 82 | char *str; |
| 83 | |
| 84 | cbyte= *cbyte_io; |
| 85 | |
| 86 | if (cbyte >= max) return adns_s_invaliddata; |
| 87 | GET_B(cbyte,l); |
| 88 | if (cbyte+l > max) return adns_s_invaliddata; |
| 89 | |
| 90 | str= adns__alloc_interim(pai->qu, l+1); |
| 91 | if (!str) R_NOMEM; |
| 92 | |
| 93 | str[l]= 0; |
| 94 | memcpy(str,dgram+cbyte,l); |
| 95 | |
| 96 | *len_r= l; |
| 97 | *str_r= str; |
| 98 | *cbyte_io= cbyte+l; |
| 99 | |
| 100 | return adns_s_ok; |
| 101 | } |
| 102 | |
| 103 | static adns_status csp_textdata(vbuf *vb, const char *dp, int len) { |
| 104 | unsigned char ch; |
| 105 | char buf[10]; |
| 106 | int cn; |
| 107 | |
| 108 | CSP_ADDSTR("\""); |
| 109 | for (cn=0; cn<len; cn++) { |
| 110 | ch= *dp++; |
| 111 | if (ch >= 32 && ch <= 126 && ch != '"' && ch != '\\') { |
| 112 | if (!adns__vbuf_append(vb,&ch,1)) R_NOMEM; |
| 113 | } else if (ch == '\\') { |
| 114 | CSP_ADDSTR("\\\\"); |
| 115 | } else { |
| 116 | sprintf(buf,"\\x%02x",ch); |
| 117 | CSP_ADDSTR(buf); |
| 118 | } |
| 119 | } |
| 120 | CSP_ADDSTR("\""); |
| 121 | |
| 122 | return adns_s_ok; |
| 123 | } |
| 124 | |
| 125 | static adns_status csp_qstring(vbuf *vb, const char *dp) { |
| 126 | return csp_textdata(vb, dp, strlen(dp)); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * _str (mf,cs) |
| 131 | */ |
| 132 | |
| 133 | static void mf_str(adns_query qu, void *datap) { |
| 134 | char **rrp= datap; |
| 135 | |
| 136 | adns__makefinal_str(qu,rrp); |
| 137 | } |
| 138 | |
| 139 | static adns_status cs_str(vbuf *vb, const void *datap) { |
| 140 | const char *const *rrp= datap; |
| 141 | |
| 142 | return csp_qstring(vb,*rrp); |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * _intstr (mf,csp,cs) |
| 147 | */ |
| 148 | |
| 149 | static void mf_intstr(adns_query qu, void *datap) { |
| 150 | adns_rr_intstr *rrp= datap; |
| 151 | |
| 152 | adns__makefinal_str(qu,&rrp->str); |
| 153 | } |
| 154 | |
| 155 | static adns_status csp_intstr(vbuf *vb, const adns_rr_intstr *rrp) { |
| 156 | char buf[10]; |
| 157 | |
| 158 | sprintf(buf,"%u ",rrp->i); |
| 159 | CSP_ADDSTR(buf); |
| 160 | return csp_qstring(vb,rrp->str); |
| 161 | } |
| 162 | |
| 163 | static adns_status cs_intstr(vbuf *vb, const void *datap) { |
| 164 | const adns_rr_intstr *rrp= datap; |
| 165 | |
| 166 | return csp_intstr(vb,rrp); |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * _manyistr (mf,cs) |
| 171 | */ |
| 172 | |
| 173 | static void mf_manyistr(adns_query qu, void *datap) { |
| 174 | adns_rr_intstr **rrp= datap; |
| 175 | adns_rr_intstr *te, *table; |
| 176 | void *tablev; |
| 177 | int tc; |
| 178 | |
| 179 | for (tc=0, te= *rrp; te->i >= 0; te++, tc++); |
| 180 | tablev= *rrp; |
| 181 | adns__makefinal_block(qu,&tablev,sizeof(*te)*(tc+1)); |
| 182 | *rrp= table= tablev; |
| 183 | for (te= *rrp; te->i >= 0; te++) |
| 184 | adns__makefinal_str(qu,&te->str); |
| 185 | } |
| 186 | |
| 187 | static adns_status cs_manyistr(vbuf *vb, const void *datap) { |
| 188 | const adns_rr_intstr *const *rrp= datap; |
| 189 | const adns_rr_intstr *current; |
| 190 | adns_status st; |
| 191 | int spc; |
| 192 | |
| 193 | for (spc=0, current= *rrp; current->i >= 0; current++) { |
| 194 | if (spc) CSP_ADDSTR(" "); |
| 195 | st= csp_textdata(vb,current->str,current->i); if (st) return st; |
| 196 | } |
| 197 | return adns_s_ok; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * _txt (pa) |
| 202 | */ |
| 203 | |
| 204 | static adns_status pa_txt(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 205 | adns_rr_intstr **rrp= datap, *table, *te; |
| 206 | const byte *dgram= pai->dgram; |
| 207 | int ti, tc, l, startbyte; |
| 208 | adns_status st; |
| 209 | |
| 210 | startbyte= cbyte; |
| 211 | if (cbyte >= max) return adns_s_invaliddata; |
| 212 | tc= 0; |
| 213 | while (cbyte < max) { |
| 214 | GET_B(cbyte,l); |
| 215 | cbyte+= l; |
| 216 | tc++; |
| 217 | } |
| 218 | if (cbyte != max) return adns_s_invaliddata; |
| 219 | |
| 220 | table= adns__alloc_interim(pai->qu,sizeof(*table)*(tc+1)); |
| 221 | if (!table) R_NOMEM; |
| 222 | |
| 223 | for (cbyte=startbyte, ti=0, te=table; ti<tc; ti++, te++) { |
| 224 | st= pap_string(pai, &cbyte, max, &te->i, &te->str); |
| 225 | if (st) return st; |
| 226 | } |
| 227 | assert(cbyte == max); |
| 228 | |
| 229 | te->i= -1; |
| 230 | te->str= 0; |
| 231 | |
| 232 | *rrp= table; |
| 233 | return adns_s_ok; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * _inaddr (pa,dip,di) |
| 238 | */ |
| 239 | |
| 240 | static adns_status pa_inaddr(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 241 | struct in_addr *storeto= datap; |
| 242 | |
| 243 | if (max-cbyte != 4) return adns_s_invaliddata; |
| 244 | memcpy(storeto, pai->dgram + cbyte, 4); |
| 245 | return adns_s_ok; |
| 246 | } |
| 247 | |
| 248 | static int search_sortlist(adns_state ads, struct in_addr ad) { |
| 249 | const struct sortlist *slp; |
| 250 | int i; |
| 251 | |
| 252 | for (i=0, slp=ads->sortlist; |
| 253 | i<ads->nsortlist && !((ad.s_addr & slp->mask.s_addr) == slp->base.s_addr); |
| 254 | i++, slp++); |
| 255 | return i; |
| 256 | } |
| 257 | |
| 258 | static int dip_inaddr(adns_state ads, struct in_addr a, struct in_addr b) { |
| 259 | int ai, bi; |
| 260 | |
| 261 | if (!ads->nsortlist) return 0; |
| 262 | |
| 263 | ai= search_sortlist(ads,a); |
| 264 | bi= search_sortlist(ads,b); |
| 265 | return bi<ai; |
| 266 | } |
| 267 | |
| 268 | static int di_inaddr(adns_state ads, const void *datap_a, const void *datap_b) { |
| 269 | const struct in_addr *ap= datap_a, *bp= datap_b; |
| 270 | |
| 271 | return dip_inaddr(ads,*ap,*bp); |
| 272 | } |
| 273 | |
| 274 | static adns_status cs_inaddr(vbuf *vb, const void *datap) { |
| 275 | const struct in_addr *rrp= datap, rr= *rrp; |
| 276 | const char *ia; |
| 277 | |
| 278 | ia= inet_ntoa(rr); assert(ia); |
| 279 | CSP_ADDSTR(ia); |
| 280 | return adns_s_ok; |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * _addr (pa,di,csp,cs) |
| 285 | */ |
| 286 | |
| 287 | static adns_status pa_addr(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 288 | adns_rr_addr *storeto= datap; |
| 289 | const byte *dgram= pai->dgram; |
| 290 | |
| 291 | if (max-cbyte != 4) return adns_s_invaliddata; |
| 292 | storeto->len= sizeof(storeto->addr.inet); |
| 293 | memset(&storeto->addr,0,sizeof(storeto->addr.inet)); |
| 294 | storeto->addr.inet.sin_family= AF_INET; |
| 295 | memcpy(&storeto->addr.inet.sin_addr,dgram+cbyte,4); |
| 296 | return adns_s_ok; |
| 297 | } |
| 298 | |
| 299 | static int di_addr(adns_state ads, const void *datap_a, const void *datap_b) { |
| 300 | const adns_rr_addr *ap= datap_a, *bp= datap_b; |
| 301 | |
| 302 | assert(ap->addr.sa.sa_family == AF_INET); |
| 303 | return dip_inaddr(ads, ap->addr.inet.sin_addr, bp->addr.inet.sin_addr); |
| 304 | } |
| 305 | |
| 306 | static int div_addr(void *context, const void *datap_a, const void *datap_b) { |
| 307 | const adns_state ads= context; |
| 308 | |
| 309 | return di_addr(ads, datap_a, datap_b); |
| 310 | } |
| 311 | |
| 312 | static adns_status csp_addr(vbuf *vb, const adns_rr_addr *rrp) { |
| 313 | const char *ia; |
| 314 | static char buf[30]; |
| 315 | |
| 316 | switch (rrp->addr.inet.sin_family) { |
| 317 | case AF_INET: |
| 318 | CSP_ADDSTR("AF_INET "); |
| 319 | ia= inet_ntoa(rrp->addr.inet.sin_addr); assert(ia); |
| 320 | CSP_ADDSTR(ia); |
| 321 | break; |
| 322 | default: |
| 323 | sprintf(buf,"AF=%u",rrp->addr.sa.sa_family); |
| 324 | CSP_ADDSTR(buf); |
| 325 | break; |
| 326 | } |
| 327 | return adns_s_ok; |
| 328 | } |
| 329 | |
| 330 | static adns_status cs_addr(vbuf *vb, const void *datap) { |
| 331 | const adns_rr_addr *rrp= datap; |
| 332 | |
| 333 | return csp_addr(vb,rrp); |
| 334 | } |
| 335 | |
| 336 | /* |
| 337 | * _domain (pap) |
| 338 | */ |
| 339 | |
| 340 | static adns_status pap_domain(const parseinfo *pai, int *cbyte_io, int max, |
| 341 | char **domain_r, parsedomain_flags flags) { |
| 342 | adns_status st; |
| 343 | char *dm; |
| 344 | |
| 345 | st= adns__parse_domain(pai->qu->ads, pai->serv, pai->qu, &pai->qu->vb, flags, |
| 346 | pai->dgram,pai->dglen, cbyte_io, max); |
| 347 | if (st) return st; |
| 348 | if (!pai->qu->vb.used) return adns_s_invaliddata; |
| 349 | |
| 350 | dm= adns__alloc_interim(pai->qu, pai->qu->vb.used+1); |
| 351 | if (!dm) R_NOMEM; |
| 352 | |
| 353 | dm[pai->qu->vb.used]= 0; |
| 354 | memcpy(dm,pai->qu->vb.buf,pai->qu->vb.used); |
| 355 | |
| 356 | *domain_r= dm; |
| 357 | return adns_s_ok; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * _host_raw (pa) |
| 362 | */ |
| 363 | |
| 364 | static adns_status pa_host_raw(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 365 | char **rrp= datap; |
| 366 | adns_status st; |
| 367 | |
| 368 | st= pap_domain(pai, &cbyte, max, rrp, |
| 369 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 370 | if (st) return st; |
| 371 | |
| 372 | if (cbyte != max) return adns_s_invaliddata; |
| 373 | return adns_s_ok; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * _hostaddr (pap,pa,dip,di,mfp,mf,csp,cs +icb_hostaddr, pap_findaddrs) |
| 378 | */ |
| 379 | |
| 380 | static adns_status pap_findaddrs(const parseinfo *pai, adns_rr_hostaddr *ha, |
| 381 | int *cbyte_io, int count, int dmstart) { |
| 382 | int rri, naddrs; |
| 383 | int type, class, rdlen, rdstart, ownermatched; |
| 384 | unsigned long ttl; |
| 385 | adns_status st; |
| 386 | |
| 387 | for (rri=0, naddrs=-1; rri<count; rri++) { |
| 388 | st= adns__findrr_anychk(pai->qu, pai->serv, pai->dgram, pai->dglen, cbyte_io, |
| 389 | &type, &class, &ttl, &rdlen, &rdstart, |
| 390 | pai->dgram, pai->dglen, dmstart, &ownermatched); |
| 391 | if (st) return st; |
| 392 | if (!ownermatched || class != DNS_CLASS_IN || type != adns_r_a) { |
| 393 | if (naddrs>0) break; else continue; |
| 394 | } |
| 395 | if (naddrs == -1) { |
| 396 | naddrs= 0; |
| 397 | } |
| 398 | if (!adns__vbuf_ensure(&pai->qu->vb, (naddrs+1)*sizeof(adns_rr_addr))) R_NOMEM; |
| 399 | adns__update_expires(pai->qu,ttl,pai->now); |
| 400 | st= pa_addr(pai, rdstart,rdstart+rdlen, |
| 401 | pai->qu->vb.buf + naddrs*sizeof(adns_rr_addr)); |
| 402 | if (st) return st; |
| 403 | naddrs++; |
| 404 | } |
| 405 | if (naddrs >= 0) { |
| 406 | ha->addrs= adns__alloc_interim(pai->qu, naddrs*sizeof(adns_rr_addr)); |
| 407 | if (!ha->addrs) R_NOMEM; |
| 408 | memcpy(ha->addrs, pai->qu->vb.buf, naddrs*sizeof(adns_rr_addr)); |
| 409 | ha->naddrs= naddrs; |
| 410 | ha->astatus= adns_s_ok; |
| 411 | |
| 412 | adns__isort(ha->addrs, naddrs, sizeof(adns_rr_addr), pai->qu->vb.buf, |
| 413 | div_addr, pai->ads); |
| 414 | } |
| 415 | return adns_s_ok; |
| 416 | } |
| 417 | |
| 418 | static void icb_hostaddr(adns_query parent, adns_query child) { |
| 419 | adns_answer *cans= child->answer; |
| 420 | adns_rr_hostaddr *rrp= child->ctx.info.hostaddr; |
| 421 | |
| 422 | rrp->astatus= cans->status; |
| 423 | rrp->naddrs= cans->nrrs; |
| 424 | rrp->addrs= cans->rrs.addr; |
| 425 | adns__transfer_interim(child, parent, rrp->addrs, rrp->naddrs*sizeof(adns_rr_addr)); |
| 426 | |
| 427 | if (!parent->children.head) adns__query_done(parent); |
| 428 | } |
| 429 | |
| 430 | static adns_status pap_hostaddr(const parseinfo *pai, int *cbyte_io, |
| 431 | int max, adns_rr_hostaddr *rrp) { |
| 432 | adns_status st; |
| 433 | int dmstart, cbyte; |
| 434 | qcontext ctx; |
| 435 | int id; |
| 436 | adns_query nqu; |
| 437 | adns_queryflags nflags; |
| 438 | |
| 439 | dmstart= cbyte= *cbyte_io; |
| 440 | st= pap_domain(pai, &cbyte, max, &rrp->host, |
| 441 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 442 | if (st) return st; |
| 443 | *cbyte_io= cbyte; |
| 444 | |
| 445 | rrp->astatus= adns_s_ok; |
| 446 | rrp->naddrs= -1; |
| 447 | rrp->addrs= 0; |
| 448 | |
| 449 | cbyte= pai->nsstart; |
| 450 | |
| 451 | st= pap_findaddrs(pai, rrp, &cbyte, pai->nscount, dmstart); |
| 452 | if (st) return st; |
| 453 | if (rrp->naddrs != -1) return adns_s_ok; |
| 454 | |
| 455 | st= pap_findaddrs(pai, rrp, &cbyte, pai->arcount, dmstart); |
| 456 | if (st) return st; |
| 457 | if (rrp->naddrs != -1) return adns_s_ok; |
| 458 | |
| 459 | st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id, |
| 460 | pai->dgram, pai->dglen, dmstart, |
| 461 | adns_r_addr, adns_qf_quoteok_query); |
| 462 | if (st) return st; |
| 463 | |
| 464 | ctx.ext= 0; |
| 465 | ctx.callback= icb_hostaddr; |
| 466 | ctx.info.hostaddr= rrp; |
| 467 | |
| 468 | nflags= adns_qf_quoteok_query; |
| 469 | if (!(pai->qu->flags & adns_qf_cname_loose)) nflags |= adns_qf_cname_forbid; |
| 470 | |
| 471 | st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr), |
| 472 | &pai->qu->vb, id, nflags, pai->now, &ctx); |
| 473 | if (st) return st; |
| 474 | |
| 475 | nqu->parent= pai->qu; |
| 476 | LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.); |
| 477 | |
| 478 | return adns_s_ok; |
| 479 | } |
| 480 | |
| 481 | static adns_status pa_hostaddr(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 482 | adns_rr_hostaddr *rrp= datap; |
| 483 | adns_status st; |
| 484 | |
| 485 | st= pap_hostaddr(pai, &cbyte, max, rrp); |
| 486 | if (st) return st; |
| 487 | if (cbyte != max) return adns_s_invaliddata; |
| 488 | |
| 489 | return adns_s_ok; |
| 490 | } |
| 491 | |
| 492 | static int dip_hostaddr(adns_state ads, const adns_rr_hostaddr *ap, const adns_rr_hostaddr *bp) { |
| 493 | if (ap->astatus != bp->astatus) return ap->astatus; |
| 494 | if (ap->astatus) return 0; |
| 495 | |
| 496 | assert(ap->addrs[0].addr.sa.sa_family == AF_INET); |
| 497 | assert(bp->addrs[0].addr.sa.sa_family == AF_INET); |
| 498 | return dip_inaddr(ads, |
| 499 | ap->addrs[0].addr.inet.sin_addr, |
| 500 | bp->addrs[0].addr.inet.sin_addr); |
| 501 | } |
| 502 | |
| 503 | static int di_hostaddr(adns_state ads, const void *datap_a, const void *datap_b) { |
| 504 | const adns_rr_hostaddr *ap= datap_a, *bp= datap_b; |
| 505 | |
| 506 | return dip_hostaddr(ads, ap,bp); |
| 507 | } |
| 508 | |
| 509 | static void mfp_hostaddr(adns_query qu, adns_rr_hostaddr *rrp) { |
| 510 | void *tablev; |
| 511 | |
| 512 | adns__makefinal_str(qu,&rrp->host); |
| 513 | tablev= rrp->addrs; |
| 514 | adns__makefinal_block(qu, &tablev, rrp->naddrs*sizeof(*rrp->addrs)); |
| 515 | rrp->addrs= tablev; |
| 516 | } |
| 517 | |
| 518 | static void mf_hostaddr(adns_query qu, void *datap) { |
| 519 | adns_rr_hostaddr *rrp= datap; |
| 520 | |
| 521 | mfp_hostaddr(qu,rrp); |
| 522 | } |
| 523 | |
| 524 | static adns_status csp_hostaddr(vbuf *vb, const adns_rr_hostaddr *rrp) { |
| 525 | const char *to_add; |
| 526 | adns_status st; |
| 527 | int i; |
| 528 | |
| 529 | st= csp_qstring(vb,rrp->host); if (st) return st; |
| 530 | |
| 531 | if (rrp->astatus) { |
| 532 | CSP_ADDSTR(" - "); |
| 533 | CSP_ADDSTR(adns_strerror(rrp->astatus)); |
| 534 | } else { |
| 535 | assert(rrp->naddrs > 0); |
| 536 | for (i=0, to_add= ": "; i<rrp->naddrs; i++, to_add= ", ") { |
| 537 | CSP_ADDSTR(to_add); |
| 538 | st= csp_addr(vb,&rrp->addrs[i]); |
| 539 | } |
| 540 | } |
| 541 | return adns_s_ok; |
| 542 | } |
| 543 | |
| 544 | static adns_status cs_hostaddr(vbuf *vb, const void *datap) { |
| 545 | const adns_rr_hostaddr *rrp= datap; |
| 546 | |
| 547 | return csp_hostaddr(vb,rrp); |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * _mx_raw (pa,di) |
| 552 | */ |
| 553 | |
| 554 | static adns_status pa_mx_raw(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 555 | const byte *dgram= pai->dgram; |
| 556 | adns_rr_intstr *rrp= datap; |
| 557 | adns_status st; |
| 558 | int pref; |
| 559 | |
| 560 | if (cbyte+2 > max) return adns_s_invaliddata; |
| 561 | GET_W(cbyte,pref); |
| 562 | rrp->i= pref; |
| 563 | st= pap_domain(pai, &cbyte, max, &rrp->str, |
| 564 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 565 | if (st) return st; |
| 566 | |
| 567 | if (cbyte != max) return adns_s_invaliddata; |
| 568 | return adns_s_ok; |
| 569 | } |
| 570 | |
| 571 | static int di_mx_raw(adns_state ads, const void *datap_a, const void *datap_b) { |
| 572 | const adns_rr_intstr *ap= datap_a, *bp= datap_b; |
| 573 | |
| 574 | if (ap->i < bp->i) return 0; |
| 575 | if (ap->i > bp->i) return 1; |
| 576 | return 0; |
| 577 | } |
| 578 | |
| 579 | /* |
| 580 | * _mx (pa,di) |
| 581 | */ |
| 582 | |
| 583 | static adns_status pa_mx(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 584 | const byte *dgram= pai->dgram; |
| 585 | adns_rr_inthostaddr *rrp= datap; |
| 586 | adns_status st; |
| 587 | int pref; |
| 588 | |
| 589 | if (cbyte+2 > max) return adns_s_invaliddata; |
| 590 | GET_W(cbyte,pref); |
| 591 | rrp->i= pref; |
| 592 | st= pap_hostaddr(pai, &cbyte, max, &rrp->ha); |
| 593 | if (st) return st; |
| 594 | |
| 595 | if (cbyte != max) return adns_s_invaliddata; |
| 596 | return adns_s_ok; |
| 597 | } |
| 598 | |
| 599 | static int di_mx(adns_state ads, const void *datap_a, const void *datap_b) { |
| 600 | const adns_rr_inthostaddr *ap= datap_a, *bp= datap_b; |
| 601 | |
| 602 | if (ap->i < bp->i) return 0; |
| 603 | if (ap->i > bp->i) return 1; |
| 604 | return dip_hostaddr(ads, &ap->ha, &bp->ha); |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * _inthostaddr (mf,cs) |
| 609 | */ |
| 610 | |
| 611 | static void mf_inthostaddr(adns_query qu, void *datap) { |
| 612 | adns_rr_inthostaddr *rrp= datap; |
| 613 | |
| 614 | mfp_hostaddr(qu,&rrp->ha); |
| 615 | } |
| 616 | |
| 617 | static adns_status cs_inthostaddr(vbuf *vb, const void *datap) { |
| 618 | const adns_rr_inthostaddr *rrp= datap; |
| 619 | char buf[10]; |
| 620 | |
| 621 | sprintf(buf,"%u ",rrp->i); |
| 622 | CSP_ADDSTR(buf); |
| 623 | |
| 624 | return csp_hostaddr(vb,&rrp->ha); |
| 625 | } |
| 626 | |
| 627 | /* |
| 628 | * _ptr (pa, +icb_ptr) |
| 629 | */ |
| 630 | |
| 631 | static void icb_ptr(adns_query parent, adns_query child) { |
| 632 | adns_answer *cans= child->answer; |
| 633 | const adns_rr_addr *queried, *found; |
| 634 | int i; |
| 635 | |
| 636 | if (cans->status == adns_s_nxdomain || cans->status == adns_s_nodata) { |
| 637 | adns__query_fail(parent,adns_s_inconsistent); |
| 638 | return; |
| 639 | } else if (cans->status) { |
| 640 | adns__query_fail(parent,cans->status); |
| 641 | return; |
| 642 | } |
| 643 | |
| 644 | queried= &parent->ctx.info.ptr_parent_addr; |
| 645 | for (i=0, found=cans->rrs.addr; i<cans->nrrs; i++, found++) { |
| 646 | if (queried->len == found->len && |
| 647 | !memcmp(&queried->addr,&found->addr,queried->len)) { |
| 648 | if (!parent->children.head) adns__query_done(parent); |
| 649 | return; |
| 650 | } |
| 651 | } |
| 652 | |
| 653 | adns__query_fail(parent,adns_s_inconsistent); |
| 654 | } |
| 655 | |
| 656 | static adns_status pa_ptr(const parseinfo *pai, int dmstart, int max, void *datap) { |
| 657 | static const char *(expectdomain[])= { DNS_INADDR_ARPA }; |
| 658 | |
| 659 | char **rrp= datap; |
| 660 | adns_status st; |
| 661 | adns_rr_addr *ap; |
| 662 | findlabel_state fls; |
| 663 | char *ep; |
| 664 | byte ipv[4]; |
| 665 | char labbuf[4]; |
| 666 | int cbyte, i, lablen, labstart, l, id; |
| 667 | adns_query nqu; |
| 668 | qcontext ctx; |
| 669 | |
| 670 | cbyte= dmstart; |
| 671 | st= pap_domain(pai, &cbyte, max, rrp, |
| 672 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 673 | if (st) return st; |
| 674 | if (cbyte != max) return adns_s_invaliddata; |
| 675 | |
| 676 | ap= &pai->qu->ctx.info.ptr_parent_addr; |
| 677 | if (!ap->len) { |
| 678 | adns__findlabel_start(&fls, pai->ads, -1, pai->qu, |
| 679 | pai->qu->query_dgram, pai->qu->query_dglen, |
| 680 | pai->qu->query_dglen, DNS_HDRSIZE, 0); |
| 681 | for (i=0; i<4; i++) { |
| 682 | st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st); |
| 683 | if (lablen<=0 || lablen>3) return adns_s_querydomainwrong; |
| 684 | memcpy(labbuf, pai->qu->query_dgram + labstart, lablen); labbuf[lablen]= 0; |
| 685 | ipv[3-i]= strtoul(labbuf,&ep,10); if (*ep) return adns_s_querydomainwrong; |
| 686 | if (lablen>1 && pai->qu->query_dgram[labstart]=='0') |
| 687 | return adns_s_querydomainwrong; |
| 688 | } |
| 689 | for (i=0; i<sizeof(expectdomain)/sizeof(*expectdomain); i++) { |
| 690 | st= adns__findlabel_next(&fls,&lablen,&labstart); assert(!st); |
| 691 | l= strlen(expectdomain[i]); |
| 692 | if (lablen != l || memcmp(pai->qu->query_dgram + labstart, expectdomain[i], l)) |
| 693 | return adns_s_querydomainwrong; |
| 694 | } |
| 695 | st= adns__findlabel_next(&fls,&lablen,0); assert(!st); |
| 696 | if (lablen) return adns_s_querydomainwrong; |
| 697 | |
| 698 | ap->len= sizeof(struct sockaddr_in); |
| 699 | memset(&ap->addr,0,sizeof(ap->addr.inet)); |
| 700 | ap->addr.inet.sin_family= AF_INET; |
| 701 | ap->addr.inet.sin_addr.s_addr= |
| 702 | htonl((ipv[0]<<24) | (ipv[1]<<16) | (ipv[2]<<8) | (ipv[3])); |
| 703 | } |
| 704 | |
| 705 | st= adns__mkquery_frdgram(pai->ads, &pai->qu->vb, &id, |
| 706 | pai->dgram, pai->dglen, dmstart, |
| 707 | adns_r_addr, adns_qf_quoteok_query); |
| 708 | if (st) return st; |
| 709 | |
| 710 | ctx.ext= 0; |
| 711 | ctx.callback= icb_ptr; |
| 712 | memset(&ctx.info,0,sizeof(ctx.info)); |
| 713 | st= adns__internal_submit(pai->ads, &nqu, adns__findtype(adns_r_addr), |
| 714 | &pai->qu->vb, id, |
| 715 | adns_qf_quoteok_query, pai->now, &ctx); |
| 716 | if (st) return st; |
| 717 | |
| 718 | nqu->parent= pai->qu; |
| 719 | LIST_LINK_TAIL_PART(pai->qu->children,nqu,siblings.); |
| 720 | |
| 721 | return adns_s_ok; |
| 722 | } |
| 723 | |
| 724 | /* |
| 725 | * _strpair (mf,cs) |
| 726 | */ |
| 727 | |
| 728 | static void mf_strpair(adns_query qu, void *datap) { |
| 729 | adns_rr_strpair *rrp= datap; |
| 730 | |
| 731 | adns__makefinal_str(qu,&rrp->array[0]); |
| 732 | adns__makefinal_str(qu,&rrp->array[1]); |
| 733 | } |
| 734 | |
| 735 | static adns_status cs_strpair(vbuf *vb, const void *datap) { |
| 736 | const adns_rr_strpair *rrp= datap; |
| 737 | adns_status st; |
| 738 | |
| 739 | st= csp_qstring(vb,rrp->array[0]); if (st) return st; |
| 740 | CSP_ADDSTR(" "); |
| 741 | st= csp_qstring(vb,rrp->array[1]); if (st) return st; |
| 742 | |
| 743 | return adns_s_ok; |
| 744 | } |
| 745 | |
| 746 | /* |
| 747 | * _intstrpair (mf,cs) |
| 748 | */ |
| 749 | |
| 750 | static void mf_intstrpair(adns_query qu, void *datap) { |
| 751 | adns_rr_intstrpair *rrp= datap; |
| 752 | |
| 753 | adns__makefinal_str(qu,&rrp->array[0].str); |
| 754 | adns__makefinal_str(qu,&rrp->array[1].str); |
| 755 | } |
| 756 | |
| 757 | static adns_status cs_intstrpair(vbuf *vb, const void *datap) { |
| 758 | const adns_rr_intstrpair *rrp= datap; |
| 759 | adns_status st; |
| 760 | |
| 761 | st= csp_intstr(vb,&rrp->array[0]); if (st) return st; |
| 762 | CSP_ADDSTR(" "); |
| 763 | st= csp_intstr(vb,&rrp->array[1]); if (st) return st; |
| 764 | |
| 765 | return adns_s_ok; |
| 766 | } |
| 767 | |
| 768 | /* |
| 769 | * _hinfo (pa) |
| 770 | */ |
| 771 | |
| 772 | static adns_status pa_hinfo(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 773 | adns_rr_intstrpair *rrp= datap; |
| 774 | adns_status st; |
| 775 | int i; |
| 776 | |
| 777 | for (i=0; i<2; i++) { |
| 778 | st= pap_string(pai, &cbyte, max, &rrp->array[i].i, &rrp->array[i].str); |
| 779 | if (st) return st; |
| 780 | } |
| 781 | |
| 782 | if (cbyte != max) return adns_s_invaliddata; |
| 783 | |
| 784 | return adns_s_ok; |
| 785 | } |
| 786 | |
| 787 | /* |
| 788 | * _mailbox (pap) |
| 789 | */ |
| 790 | |
| 791 | static adns_status pap_mailbox(const parseinfo *pai, int *cbyte_io, int max, |
| 792 | char **mb_r) { |
| 793 | int lablen, labstart, i, needquote, c, r, neednorm; |
| 794 | const unsigned char *p; |
| 795 | char *str; |
| 796 | findlabel_state fls; |
| 797 | adns_status st; |
| 798 | vbuf *vb; |
| 799 | |
| 800 | vb= &pai->qu->vb; |
| 801 | vb->used= 0; |
| 802 | adns__findlabel_start(&fls, pai->ads, |
| 803 | -1, pai->qu, |
| 804 | pai->dgram, pai->dglen, max, |
| 805 | *cbyte_io, cbyte_io); |
| 806 | st= adns__findlabel_next(&fls,&lablen,&labstart); |
| 807 | if (!lablen) { |
| 808 | adns__vbuf_appendstr(vb,"<>"); |
| 809 | goto x_ok; |
| 810 | } |
| 811 | |
| 812 | neednorm= 1; |
| 813 | for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++) { |
| 814 | c= *p++; |
| 815 | if ((c&~128) < 32 || (c&~128) == 127) return adns_s_invaliddata; |
| 816 | if (c == '.' && !neednorm) neednorm= 1; |
| 817 | else if (strchr("()<>@,;:\\\".[]",c)) needquote++; |
| 818 | else neednorm= 0; |
| 819 | } |
| 820 | |
| 821 | if (needquote || neednorm) { |
| 822 | r= adns__vbuf_ensure(vb, lablen+needquote+4); if (!r) R_NOMEM; |
| 823 | adns__vbuf_appendq(vb,"\"",1); |
| 824 | for (i=0, needquote=0, p= pai->dgram+labstart; i<lablen; i++, p++) { |
| 825 | c= *p; |
| 826 | if (strchr("()<>@,;:\\\".[]",c)) adns__vbuf_appendq(vb,"\\",1); |
| 827 | adns__vbuf_appendq(vb,p,1); |
| 828 | } |
| 829 | adns__vbuf_appendq(vb,"\"",1); |
| 830 | } else { |
| 831 | r= adns__vbuf_append(vb, pai->dgram+labstart, lablen); if (!r) R_NOMEM; |
| 832 | } |
| 833 | |
| 834 | r= adns__vbuf_appendstr(vb,"@"); if (!r) R_NOMEM; |
| 835 | |
| 836 | st= adns__parse_domain_more(&fls,pai->ads, pai->qu,vb,0, pai->dgram); |
| 837 | if (st) return st; |
| 838 | |
| 839 | x_ok: |
| 840 | str= adns__alloc_interim(pai->qu, vb->used+1); if (!str) R_NOMEM; |
| 841 | memcpy(str,vb->buf,vb->used); |
| 842 | str[vb->used]= 0; |
| 843 | *mb_r= str; |
| 844 | return adns_s_ok; |
| 845 | } |
| 846 | |
| 847 | /* |
| 848 | * _rp (pa) |
| 849 | */ |
| 850 | |
| 851 | static adns_status pa_rp(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 852 | adns_rr_strpair *rrp= datap; |
| 853 | adns_status st; |
| 854 | |
| 855 | st= pap_mailbox(pai, &cbyte, max, &rrp->array[0]); |
| 856 | if (st) return st; |
| 857 | |
| 858 | st= pap_domain(pai, &cbyte, max, &rrp->array[1], pdf_quoteok); |
| 859 | if (st) return st; |
| 860 | |
| 861 | if (cbyte != max) return adns_s_invaliddata; |
| 862 | return adns_s_ok; |
| 863 | } |
| 864 | |
| 865 | /* |
| 866 | * _soa (pa,mf,cs) |
| 867 | */ |
| 868 | |
| 869 | static adns_status pa_soa(const parseinfo *pai, int cbyte, int max, void *datap) { |
| 870 | adns_rr_soa *rrp= datap; |
| 871 | const byte *dgram= pai->dgram; |
| 872 | adns_status st; |
| 873 | int msw, lsw, i; |
| 874 | |
| 875 | st= pap_domain(pai, &cbyte, max, &rrp->mname, |
| 876 | pai->qu->flags & adns_qf_quoteok_anshost ? pdf_quoteok : 0); |
| 877 | if (st) return st; |
| 878 | |
| 879 | st= pap_mailbox(pai, &cbyte, max, &rrp->rname); |
| 880 | if (st) return st; |
| 881 | |
| 882 | if (cbyte+20 != max) return adns_s_invaliddata; |
| 883 | |
| 884 | for (i=0; i<5; i++) { |
| 885 | GET_W(cbyte,msw); |
| 886 | GET_W(cbyte,lsw); |
| 887 | (&rrp->serial)[i]= (msw<<16) | lsw; |
| 888 | } |
| 889 | |
| 890 | return adns_s_ok; |
| 891 | } |
| 892 | |
| 893 | static void mf_soa(adns_query qu, void *datap) { |
| 894 | adns_rr_soa *rrp= datap; |
| 895 | |
| 896 | adns__makefinal_str(qu,&rrp->mname); |
| 897 | adns__makefinal_str(qu,&rrp->rname); |
| 898 | } |
| 899 | |
| 900 | static adns_status cs_soa(vbuf *vb, const void *datap) { |
| 901 | const adns_rr_soa *rrp= datap; |
| 902 | char buf[20]; |
| 903 | int i; |
| 904 | adns_status st; |
| 905 | |
| 906 | st= csp_qstring(vb,rrp->mname); if (st) return st; |
| 907 | CSP_ADDSTR(" "); |
| 908 | st= csp_qstring(vb,rrp->rname); if (st) return st; |
| 909 | |
| 910 | for (i=0; i<5; i++) { |
| 911 | sprintf(buf," %lu",(&rrp->serial)[i]); |
| 912 | CSP_ADDSTR(buf); |
| 913 | } |
| 914 | |
| 915 | return adns_s_ok; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * _flat (mf) |
| 920 | */ |
| 921 | |
| 922 | static void mf_flat(adns_query qu, void *data) { } |
| 923 | |
| 924 | /* |
| 925 | * Now the table. |
| 926 | */ |
| 927 | |
| 928 | #define TYPESZ_M(member) (sizeof(*((adns_answer*)0)->rrs.member)) |
| 929 | |
| 930 | #define DEEP_MEMB(memb) TYPESZ_M(memb), mf_##memb, cs_##memb |
| 931 | #define FLAT_MEMB(memb) TYPESZ_M(memb), mf_flat, cs_##memb |
| 932 | |
| 933 | #define DEEP_TYPE(code,rrt,fmt,memb,parser,comparer) \ |
| 934 | { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_##memb, cs_##memb, parser, comparer } |
| 935 | #define FLAT_TYPE(code,rrt,fmt,memb,parser,comparer) \ |
| 936 | { adns_r_##code, rrt, fmt, TYPESZ_M(memb), mf_flat, cs_##memb, parser, comparer } |
| 937 | |
| 938 | static const typeinfo typeinfos[] = { |
| 939 | /* Must be in ascending order of rrtype ! */ |
| 940 | /* mem-mgmt code rrt fmt member parser comparer */ |
| 941 | |
| 942 | FLAT_TYPE(a, "A", 0, inaddr, pa_inaddr, di_inaddr ), |
| 943 | DEEP_TYPE(ns_raw, "NS", "raw", str, pa_host_raw, 0 ), |
| 944 | DEEP_TYPE(cname, "CNAME", 0, str, pa_host_raw, 0 ), |
| 945 | DEEP_TYPE(soa_raw, "SOA", "raw", soa, pa_soa, 0 ), |
| 946 | DEEP_TYPE(ptr_raw, "PTR", "raw", str, pa_host_raw, 0 ), |
| 947 | DEEP_TYPE(hinfo, "HINFO", 0, intstrpair, pa_hinfo, 0 ), |
| 948 | DEEP_TYPE(mx_raw, "MX", "raw", intstr, pa_mx_raw, di_mx_raw ), |
| 949 | DEEP_TYPE(txt, "TXT", 0, manyistr, pa_txt, 0 ), |
| 950 | DEEP_TYPE(rp_raw, "RP", "raw", strpair, pa_rp, 0 ), |
| 951 | |
| 952 | FLAT_TYPE(addr, "A", "addr", addr, pa_addr, di_addr ), |
| 953 | DEEP_TYPE(ns, "NS", "+addr", hostaddr, pa_hostaddr, di_hostaddr ), |
| 954 | DEEP_TYPE(ptr, "PTR","checked", str, pa_ptr, 0 ), |
| 955 | DEEP_TYPE(mx, "MX", "+addr", inthostaddr, pa_mx, di_mx ), |
| 956 | |
| 957 | DEEP_TYPE(soa, "SOA","822", soa, pa_soa, 0 ), |
| 958 | DEEP_TYPE(rp, "RP", "822", strpair, pa_rp, 0 ), |
| 959 | }; |
| 960 | |
| 961 | const typeinfo *adns__findtype(adns_rrtype type) { |
| 962 | const typeinfo *begin, *end, *mid; |
| 963 | |
| 964 | begin= typeinfos; end= typeinfos+(sizeof(typeinfos)/sizeof(typeinfo)); |
| 965 | |
| 966 | while (begin < end) { |
| 967 | mid= begin + ((end-begin)>>1); |
| 968 | if (mid->type == type) return mid; |
| 969 | if (type > mid->type) begin= mid+1; |
| 970 | else end= mid; |
| 971 | } |
| 972 | return 0; |
| 973 | } |