| 1 | /* |
| 2 | * query.c |
| 3 | * - overall query management (allocation, completion) |
| 4 | * - per-query memory management |
| 5 | * - query submission and cancellation (user-visible and internal) |
| 6 | */ |
| 7 | /* |
| 8 | * This file is part of adns, which is |
| 9 | * Copyright (C) 1997-2000,2003,2006 Ian Jackson |
| 10 | * Copyright (C) 1999-2000,2003,2006 Tony Finch |
| 11 | * Copyright (C) 1991 Massachusetts Institute of Technology |
| 12 | * (See the file INSTALL for full details.) |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 3, or (at your option) |
| 17 | * any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software Foundation. |
| 26 | */ |
| 27 | |
| 28 | #include "internal.h" |
| 29 | |
| 30 | #include <stdlib.h> |
| 31 | #include <unistd.h> |
| 32 | #include <errno.h> |
| 33 | |
| 34 | #include <sys/time.h> |
| 35 | |
| 36 | #include "internal.h" |
| 37 | |
| 38 | static adns_query query_alloc(adns_state ads, |
| 39 | const typeinfo *typei, adns_rrtype type, |
| 40 | adns_queryflags flags, struct timeval now) { |
| 41 | /* Allocate a virgin query and return it. */ |
| 42 | adns_query qu; |
| 43 | |
| 44 | qu= malloc(sizeof(*qu)); if (!qu) return 0; |
| 45 | qu->answer= malloc(sizeof(*qu->answer)); |
| 46 | if (!qu->answer) { free(qu); return 0; } |
| 47 | |
| 48 | qu->ads= ads; |
| 49 | qu->state= query_tosend; |
| 50 | qu->back= qu->next= qu->parent= 0; |
| 51 | LIST_INIT(qu->children); |
| 52 | LINK_INIT(qu->siblings); |
| 53 | LIST_INIT(qu->allocations); |
| 54 | qu->interim_allocd= 0; |
| 55 | qu->preserved_allocd= 0; |
| 56 | qu->final_allocspace= 0; |
| 57 | |
| 58 | qu->typei= typei; |
| 59 | qu->query_dgram= 0; |
| 60 | qu->query_dglen= 0; |
| 61 | adns__vbuf_init(&qu->vb); |
| 62 | |
| 63 | qu->cname_dgram= 0; |
| 64 | qu->cname_dglen= qu->cname_begin= 0; |
| 65 | |
| 66 | adns__vbuf_init(&qu->search_vb); |
| 67 | qu->search_origlen= qu->search_pos= qu->search_doneabs= 0; |
| 68 | |
| 69 | qu->id= -2; /* will be overwritten with real id before we leave adns */ |
| 70 | qu->flags= flags; |
| 71 | qu->retries= 0; |
| 72 | qu->udpnextserver= 0; |
| 73 | qu->udpsent= 0; |
| 74 | timerclear(&qu->timeout); |
| 75 | qu->expires= now.tv_sec + MAXTTLBELIEVE; |
| 76 | |
| 77 | memset(&qu->ctx,0,sizeof(qu->ctx)); |
| 78 | |
| 79 | qu->answer->status= adns_s_ok; |
| 80 | qu->answer->cname= qu->answer->owner= 0; |
| 81 | qu->answer->type= type; |
| 82 | qu->answer->expires= -1; |
| 83 | qu->answer->nrrs= 0; |
| 84 | qu->answer->rrs.untyped= 0; |
| 85 | qu->answer->rrsz= typei->getrrsz(typei,type); |
| 86 | |
| 87 | return qu; |
| 88 | } |
| 89 | |
| 90 | static void query_submit(adns_state ads, adns_query qu, |
| 91 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
| 92 | adns_queryflags flags, struct timeval now) { |
| 93 | /* Fills in the query message in for a previously-allocated query, |
| 94 | * and submits it. Cannot fail. Takes over the memory for qumsg_vb. |
| 95 | */ |
| 96 | |
| 97 | qu->vb= *qumsg_vb; |
| 98 | adns__vbuf_init(qumsg_vb); |
| 99 | |
| 100 | qu->query_dgram= malloc(qu->vb.used); |
| 101 | if (!qu->query_dgram) { adns__query_fail(qu,adns_s_nomemory); return; } |
| 102 | |
| 103 | qu->id= id; |
| 104 | qu->query_dglen= qu->vb.used; |
| 105 | memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used); |
| 106 | |
| 107 | typei->query_send(qu,now); |
| 108 | } |
| 109 | |
| 110 | adns_status adns__ckl_hostname(adns_state ads, adns_queryflags flags, |
| 111 | union checklabel_state *cls, |
| 112 | qcontext *ctx, int labnum, |
| 113 | const char *dgram, int labstart, int lablen) |
| 114 | { |
| 115 | int i, c; |
| 116 | const char *label = dgram+labstart; |
| 117 | |
| 118 | if (flags & adns_qf_quoteok_query) return adns_s_ok; |
| 119 | for (i=0; i<lablen; i++) { |
| 120 | c= label[i]; |
| 121 | if (c == '-') { |
| 122 | if (!i) return adns_s_querydomaininvalid; |
| 123 | } else if (!ctype_alpha(c) && !ctype_digit(c)) { |
| 124 | return adns_s_querydomaininvalid; |
| 125 | } |
| 126 | } |
| 127 | return adns_s_ok; |
| 128 | } |
| 129 | |
| 130 | static adns_status check_domain_name(adns_state ads, adns_queryflags flags, |
| 131 | qcontext *ctx, const typeinfo *typei, |
| 132 | const byte *dgram, int dglen) |
| 133 | { |
| 134 | findlabel_state fls; |
| 135 | adns_status st; |
| 136 | int labnum= 0, labstart, lablen; |
| 137 | union checklabel_state cls; |
| 138 | |
| 139 | adns__findlabel_start(&fls,ads, -1,0, dgram,dglen,dglen, DNS_HDRSIZE,0); |
| 140 | do { |
| 141 | st= adns__findlabel_next(&fls, &lablen,&labstart); |
| 142 | assert(!st); assert(lablen >= 0); |
| 143 | st= typei->checklabel(ads,flags, &cls,ctx, |
| 144 | labnum++, dgram,labstart,lablen); |
| 145 | if (st) return st; |
| 146 | } while (lablen); |
| 147 | return adns_s_ok; |
| 148 | } |
| 149 | |
| 150 | adns_status adns__internal_submit(adns_state ads, adns_query *query_r, |
| 151 | adns_query parent, |
| 152 | const typeinfo *typei, adns_rrtype type, |
| 153 | vbuf *qumsg_vb, int id, |
| 154 | adns_queryflags flags, struct timeval now, |
| 155 | qcontext *ctx) { |
| 156 | adns_query qu; |
| 157 | adns_status st; |
| 158 | |
| 159 | st= check_domain_name(ads, flags,ctx,typei, qumsg_vb->buf,qumsg_vb->used); |
| 160 | if (st) goto x_err; |
| 161 | qu= query_alloc(ads,typei,type,flags,now); |
| 162 | if (!qu) { st = adns_s_nomemory; goto x_err; } |
| 163 | *query_r= qu; |
| 164 | |
| 165 | qu->parent= parent; |
| 166 | LIST_LINK_TAIL_PART(parent->children,qu,siblings.); |
| 167 | memcpy(&qu->ctx,ctx,sizeof(qu->ctx)); |
| 168 | query_submit(ads,qu, typei,qumsg_vb,id,flags,now); |
| 169 | |
| 170 | return adns_s_ok; |
| 171 | |
| 172 | x_err: |
| 173 | adns__vbuf_free(qumsg_vb); |
| 174 | return st; |
| 175 | } |
| 176 | |
| 177 | static void query_simple(adns_state ads, adns_query qu, |
| 178 | const char *owner, int ol, |
| 179 | const typeinfo *typei, adns_queryflags flags, |
| 180 | struct timeval now) { |
| 181 | vbuf vb_new; |
| 182 | int id; |
| 183 | adns_status st; |
| 184 | |
| 185 | st= adns__mkquery(ads,&qu->vb,&id, owner,ol, |
| 186 | typei,qu->answer->type, flags); |
| 187 | if (st) { |
| 188 | if (st == adns_s_querydomaintoolong && (flags & adns_qf_search)) { |
| 189 | adns__search_next(ads,qu,now); |
| 190 | return; |
| 191 | } else { |
| 192 | adns__query_fail(qu,st); |
| 193 | return; |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | st= check_domain_name(ads, flags,&qu->ctx,typei, qu->vb.buf,qu->vb.used); |
| 198 | if (st) { adns__query_fail(qu,st); return; } |
| 199 | |
| 200 | vb_new= qu->vb; |
| 201 | adns__vbuf_init(&qu->vb); |
| 202 | query_submit(ads,qu, typei,&vb_new,id, flags,now); |
| 203 | } |
| 204 | |
| 205 | void adns__search_next(adns_state ads, adns_query qu, struct timeval now) { |
| 206 | const char *nextentry; |
| 207 | adns_status st; |
| 208 | |
| 209 | if (qu->search_doneabs<0) { |
| 210 | nextentry= 0; |
| 211 | qu->search_doneabs= 1; |
| 212 | } else { |
| 213 | if (qu->search_pos >= ads->nsearchlist) { |
| 214 | if (qu->search_doneabs) { |
| 215 | qu->search_vb.used= qu->search_origlen; |
| 216 | st= adns_s_nxdomain; goto x_fail; |
| 217 | } else { |
| 218 | nextentry= 0; |
| 219 | qu->search_doneabs= 1; |
| 220 | } |
| 221 | } else { |
| 222 | nextentry= ads->searchlist[qu->search_pos++]; |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | qu->search_vb.used= qu->search_origlen; |
| 227 | if (nextentry) { |
| 228 | if (!adns__vbuf_append(&qu->search_vb,".",1) || |
| 229 | !adns__vbuf_appendstr(&qu->search_vb,nextentry)) |
| 230 | goto x_nomemory; |
| 231 | } |
| 232 | |
| 233 | free(qu->query_dgram); |
| 234 | qu->query_dgram= 0; qu->query_dglen= 0; |
| 235 | |
| 236 | query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used, |
| 237 | qu->typei, qu->flags, now); |
| 238 | return; |
| 239 | |
| 240 | x_nomemory: |
| 241 | st= adns_s_nomemory; |
| 242 | x_fail: |
| 243 | adns__query_fail(qu,st); |
| 244 | } |
| 245 | |
| 246 | static int save_owner(adns_query qu, const char *owner, int ol) { |
| 247 | /* Returns 1 if OK, otherwise there was no memory. */ |
| 248 | adns_answer *ans; |
| 249 | |
| 250 | if (!(qu->flags & adns_qf_owner)) return 1; |
| 251 | |
| 252 | ans= qu->answer; |
| 253 | assert(!ans->owner); |
| 254 | |
| 255 | ans->owner= adns__alloc_preserved(qu,ol+1); if (!ans->owner) return 0; |
| 256 | |
| 257 | memcpy(ans->owner,owner,ol); |
| 258 | ans->owner[ol]= 0; |
| 259 | return 1; |
| 260 | } |
| 261 | |
| 262 | int adns_submit(adns_state ads, |
| 263 | const char *owner, |
| 264 | adns_rrtype type, |
| 265 | adns_queryflags flags, |
| 266 | void *context, |
| 267 | adns_query *query_r) { |
| 268 | int r, ol, ndots; |
| 269 | adns_status st; |
| 270 | const typeinfo *typei; |
| 271 | struct timeval now; |
| 272 | adns_query qu; |
| 273 | const char *p; |
| 274 | |
| 275 | adns__consistency(ads,0,cc_entex); |
| 276 | |
| 277 | typei= adns__findtype(type); |
| 278 | if (!typei) return ENOSYS; |
| 279 | |
| 280 | r= gettimeofday(&now,0); if (r) goto x_errno; |
| 281 | qu= query_alloc(ads,typei,type,flags,now); if (!qu) goto x_errno; |
| 282 | |
| 283 | qu->ctx.ext= context; |
| 284 | qu->ctx.callback= 0; |
| 285 | memset(&qu->ctx.pinfo,0,sizeof(qu->ctx.pinfo)); |
| 286 | memset(&qu->ctx.tinfo,0,sizeof(qu->ctx.tinfo)); |
| 287 | |
| 288 | *query_r= qu; |
| 289 | |
| 290 | ol= strlen(owner); |
| 291 | if (!ol) { st= adns_s_querydomaininvalid; goto x_adnsfail; } |
| 292 | if (ol>DNS_MAXDOMAIN+1) { st= adns_s_querydomaintoolong; goto x_adnsfail; } |
| 293 | |
| 294 | if (ol>=1 && owner[ol-1]=='.' && (ol<2 || owner[ol-2]!='\\')) { |
| 295 | flags &= ~adns_qf_search; |
| 296 | qu->flags= flags; |
| 297 | ol--; |
| 298 | } |
| 299 | |
| 300 | if (flags & adns_qf_search) { |
| 301 | r= adns__vbuf_append(&qu->search_vb,owner,ol); |
| 302 | if (!r) { st= adns_s_nomemory; goto x_adnsfail; } |
| 303 | |
| 304 | for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++); |
| 305 | qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0; |
| 306 | qu->search_origlen= ol; |
| 307 | adns__search_next(ads,qu,now); |
| 308 | } else { |
| 309 | if (flags & adns_qf_owner) { |
| 310 | if (!save_owner(qu,owner,ol)) { st= adns_s_nomemory; goto x_adnsfail; } |
| 311 | } |
| 312 | query_simple(ads,qu, owner,ol, typei,flags, now); |
| 313 | } |
| 314 | adns__autosys(ads,now); |
| 315 | adns__returning(ads,qu); |
| 316 | return 0; |
| 317 | |
| 318 | x_adnsfail: |
| 319 | adns__query_fail(qu,st); |
| 320 | adns__returning(ads,qu); |
| 321 | return 0; |
| 322 | |
| 323 | x_errno: |
| 324 | r= errno; |
| 325 | assert(r); |
| 326 | adns__returning(ads,0); |
| 327 | return r; |
| 328 | } |
| 329 | |
| 330 | int adns_submit_reverse_any(adns_state ads, |
| 331 | const struct sockaddr *addr, |
| 332 | const char *zone, |
| 333 | adns_rrtype type, |
| 334 | adns_queryflags flags, |
| 335 | void *context, |
| 336 | adns_query *query_r) { |
| 337 | char *buf, *buf_free = 0; |
| 338 | char shortbuf[100]; |
| 339 | int r; |
| 340 | |
| 341 | flags &= ~adns_qf_search; |
| 342 | |
| 343 | buf = shortbuf; |
| 344 | r= adns__make_reverse_domain(addr,zone, &buf,sizeof(shortbuf),&buf_free); |
| 345 | if (r) return r; |
| 346 | r= adns_submit(ads,buf,type,flags,context,query_r); |
| 347 | free(buf_free); |
| 348 | return r; |
| 349 | } |
| 350 | |
| 351 | int adns_submit_reverse(adns_state ads, |
| 352 | const struct sockaddr *addr, |
| 353 | adns_rrtype type, |
| 354 | adns_queryflags flags, |
| 355 | void *context, |
| 356 | adns_query *query_r) { |
| 357 | if (((type^adns_r_ptr) & adns_rrt_reprmask) && |
| 358 | ((type^adns_r_ptr_raw) & adns_rrt_reprmask)) |
| 359 | return EINVAL; |
| 360 | return adns_submit_reverse_any(ads,addr,0,type,flags,context,query_r); |
| 361 | } |
| 362 | |
| 363 | int adns_synchronous(adns_state ads, |
| 364 | const char *owner, |
| 365 | adns_rrtype type, |
| 366 | adns_queryflags flags, |
| 367 | adns_answer **answer_r) { |
| 368 | adns_query qu; |
| 369 | int r; |
| 370 | |
| 371 | r= adns_submit(ads,owner,type,flags,0,&qu); |
| 372 | if (r) return r; |
| 373 | |
| 374 | r= adns_wait(ads,&qu,answer_r,0); |
| 375 | if (r) adns_cancel(qu); |
| 376 | |
| 377 | return r; |
| 378 | } |
| 379 | |
| 380 | static void *alloc_common(adns_query qu, size_t sz) { |
| 381 | allocnode *an; |
| 382 | |
| 383 | if (!sz) return qu; /* Any old pointer will do */ |
| 384 | assert(!qu->final_allocspace); |
| 385 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
| 386 | if (!an) return 0; |
| 387 | LIST_LINK_TAIL(qu->allocations,an); |
| 388 | an->sz= sz; |
| 389 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
| 390 | } |
| 391 | |
| 392 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
| 393 | void *rv; |
| 394 | |
| 395 | sz= MEM_ROUND(sz); |
| 396 | rv= alloc_common(qu,sz); |
| 397 | if (!rv) return 0; |
| 398 | qu->interim_allocd += sz; |
| 399 | return rv; |
| 400 | } |
| 401 | |
| 402 | void *adns__alloc_preserved(adns_query qu, size_t sz) { |
| 403 | void *rv; |
| 404 | |
| 405 | sz= MEM_ROUND(sz); |
| 406 | rv= adns__alloc_interim(qu,sz); |
| 407 | if (!rv) return 0; |
| 408 | qu->preserved_allocd += sz; |
| 409 | return rv; |
| 410 | } |
| 411 | |
| 412 | static allocnode *alloc__info(adns_query qu, void *p, size_t *sz_r) { |
| 413 | allocnode *an; |
| 414 | |
| 415 | if (!p || p == qu) { *sz_r= 0; return 0; } |
| 416 | an= (allocnode *)((byte *)p - MEM_ROUND(sizeof(allocnode))); |
| 417 | *sz_r= MEM_ROUND(an->sz); |
| 418 | return an; |
| 419 | } |
| 420 | |
| 421 | void adns__free_interim(adns_query qu, void *p) { |
| 422 | size_t sz; |
| 423 | allocnode *an= alloc__info(qu, p, &sz); |
| 424 | |
| 425 | if (!an) return; |
| 426 | assert(!qu->final_allocspace); |
| 427 | LIST_UNLINK(qu->allocations, an); |
| 428 | free(an); |
| 429 | qu->interim_allocd -= sz; |
| 430 | assert(!qu->interim_allocd >= 0); |
| 431 | } |
| 432 | |
| 433 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
| 434 | return alloc_common(qu,MEM_ROUND(sz)); |
| 435 | } |
| 436 | |
| 437 | void adns__transfer_interim(adns_query from, adns_query to, void *block) { |
| 438 | size_t sz; |
| 439 | allocnode *an= alloc__info(from, block, &sz); |
| 440 | |
| 441 | if (!an) return; |
| 442 | |
| 443 | assert(!to->final_allocspace); |
| 444 | assert(!from->final_allocspace); |
| 445 | |
| 446 | LIST_UNLINK(from->allocations,an); |
| 447 | LIST_LINK_TAIL(to->allocations,an); |
| 448 | |
| 449 | from->interim_allocd -= sz; |
| 450 | to->interim_allocd += sz; |
| 451 | |
| 452 | if (to->expires > from->expires) to->expires= from->expires; |
| 453 | } |
| 454 | |
| 455 | void *adns__alloc_final(adns_query qu, size_t sz) { |
| 456 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
| 457 | * each allocation, and use final_allocspace to point to the next free |
| 458 | * bit. |
| 459 | */ |
| 460 | void *rp; |
| 461 | |
| 462 | sz= MEM_ROUND(sz); |
| 463 | rp= qu->final_allocspace; |
| 464 | assert(rp); |
| 465 | qu->interim_allocd -= sz; |
| 466 | assert(qu->interim_allocd>=0); |
| 467 | qu->final_allocspace= (byte*)rp + sz; |
| 468 | return rp; |
| 469 | } |
| 470 | |
| 471 | void adns__cancel_children(adns_query qu) { |
| 472 | adns_query cqu, ncqu; |
| 473 | |
| 474 | for (cqu= qu->children.head; cqu; cqu= ncqu) { |
| 475 | ncqu= cqu->siblings.next; |
| 476 | adns__cancel(cqu); |
| 477 | } |
| 478 | } |
| 479 | |
| 480 | void adns__reset_preserved(adns_query qu) { |
| 481 | assert(!qu->final_allocspace); |
| 482 | adns__cancel_children(qu); |
| 483 | qu->answer->nrrs= 0; |
| 484 | qu->answer->rrs.untyped= 0; |
| 485 | qu->interim_allocd= qu->preserved_allocd; |
| 486 | } |
| 487 | |
| 488 | static void free_query_allocs(adns_query qu) { |
| 489 | allocnode *an, *ann; |
| 490 | |
| 491 | adns__cancel_children(qu); |
| 492 | for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); } |
| 493 | LIST_INIT(qu->allocations); |
| 494 | adns__vbuf_free(&qu->vb); |
| 495 | adns__vbuf_free(&qu->search_vb); |
| 496 | free(qu->query_dgram); |
| 497 | qu->query_dgram= 0; |
| 498 | } |
| 499 | |
| 500 | void adns__returning(adns_state ads, adns_query qu_for_caller) { |
| 501 | while (ads->intdone.head) { |
| 502 | adns_query iq= ads->intdone.head; |
| 503 | adns_query parent= iq->parent; |
| 504 | LIST_UNLINK_PART(parent->children,iq,siblings.); |
| 505 | LIST_UNLINK(iq->ads->childw,parent); |
| 506 | LIST_UNLINK(ads->intdone,iq); |
| 507 | iq->ctx.callback(parent,iq); |
| 508 | free_query_allocs(iq); |
| 509 | free(iq->answer); |
| 510 | free(iq); |
| 511 | } |
| 512 | adns__consistency(ads,qu_for_caller,cc_entex); |
| 513 | } |
| 514 | |
| 515 | void adns__cancel(adns_query qu) { |
| 516 | adns_state ads; |
| 517 | |
| 518 | ads= qu->ads; |
| 519 | adns__consistency(ads,qu,cc_freq); |
| 520 | if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.); |
| 521 | switch (qu->state) { |
| 522 | case query_tosend: |
| 523 | LIST_UNLINK(ads->udpw,qu); |
| 524 | break; |
| 525 | case query_tcpw: |
| 526 | LIST_UNLINK(ads->tcpw,qu); |
| 527 | break; |
| 528 | case query_childw: |
| 529 | LIST_UNLINK(ads->childw,qu); |
| 530 | break; |
| 531 | case query_done: |
| 532 | if (qu->parent) |
| 533 | LIST_UNLINK(ads->intdone,qu); |
| 534 | else |
| 535 | LIST_UNLINK(ads->output,qu); |
| 536 | break; |
| 537 | default: |
| 538 | abort(); |
| 539 | } |
| 540 | free_query_allocs(qu); |
| 541 | free(qu->answer); |
| 542 | free(qu); |
| 543 | } |
| 544 | |
| 545 | void adns_cancel(adns_query qu) { |
| 546 | adns_state ads; |
| 547 | |
| 548 | assert(!qu->parent); |
| 549 | ads= qu->ads; |
| 550 | adns__consistency(ads,qu,cc_entex); |
| 551 | adns__cancel(qu); |
| 552 | adns__returning(ads,0); |
| 553 | } |
| 554 | |
| 555 | void adns__update_expires(adns_query qu, unsigned long ttl, |
| 556 | struct timeval now) { |
| 557 | time_t max; |
| 558 | |
| 559 | assert(ttl <= MAXTTLBELIEVE); |
| 560 | max= now.tv_sec + ttl; |
| 561 | if (qu->expires < max) return; |
| 562 | qu->expires= max; |
| 563 | } |
| 564 | |
| 565 | static void makefinal_query(adns_query qu) { |
| 566 | adns_answer *ans; |
| 567 | int rrn; |
| 568 | |
| 569 | ans= qu->answer; |
| 570 | |
| 571 | if (qu->interim_allocd) { |
| 572 | ans= realloc(qu->answer, |
| 573 | MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd)); |
| 574 | if (!ans) goto x_nomem; |
| 575 | qu->answer= ans; |
| 576 | } |
| 577 | |
| 578 | qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans)); |
| 579 | adns__makefinal_str(qu,&ans->cname); |
| 580 | adns__makefinal_str(qu,&ans->owner); |
| 581 | |
| 582 | if (ans->nrrs) { |
| 583 | adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz); |
| 584 | |
| 585 | for (rrn=0; rrn<ans->nrrs; rrn++) |
| 586 | qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz); |
| 587 | } |
| 588 | |
| 589 | free_query_allocs(qu); |
| 590 | return; |
| 591 | |
| 592 | x_nomem: |
| 593 | qu->preserved_allocd= 0; |
| 594 | qu->answer->cname= 0; |
| 595 | qu->answer->owner= 0; |
| 596 | adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */ |
| 597 | |
| 598 | qu->answer->status= adns_s_nomemory; |
| 599 | free_query_allocs(qu); |
| 600 | } |
| 601 | |
| 602 | void adns__query_done(adns_query qu) { |
| 603 | adns_state ads=qu->ads; |
| 604 | adns_answer *ans; |
| 605 | |
| 606 | adns__cancel_children(qu); |
| 607 | |
| 608 | qu->id= -1; |
| 609 | ans= qu->answer; |
| 610 | |
| 611 | if (qu->flags & adns_qf_search && ans->status != adns_s_nomemory) { |
| 612 | if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) { |
| 613 | adns__query_fail(qu,adns_s_nomemory); |
| 614 | return; |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | if (ans->nrrs && qu->typei->diff_needswap) { |
| 619 | if (!adns__vbuf_ensure(&qu->vb,qu->answer->rrsz)) { |
| 620 | adns__query_fail(qu,adns_s_nomemory); |
| 621 | return; |
| 622 | } |
| 623 | adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz, |
| 624 | qu->vb.buf, |
| 625 | (int(*)(void*, const void*, const void*)) |
| 626 | qu->typei->diff_needswap, |
| 627 | qu->ads); |
| 628 | } |
| 629 | if (ans->nrrs && qu->typei->postsort) { |
| 630 | qu->typei->postsort(qu->ads, ans->rrs.bytes, |
| 631 | ans->nrrs,ans->rrsz, qu->typei); |
| 632 | } |
| 633 | |
| 634 | ans->expires= qu->expires; |
| 635 | qu->state= query_done; |
| 636 | if (qu->parent) { |
| 637 | LIST_LINK_TAIL(ads->intdone,qu); |
| 638 | } else { |
| 639 | makefinal_query(qu); |
| 640 | LIST_LINK_TAIL(qu->ads->output,qu); |
| 641 | } |
| 642 | } |
| 643 | |
| 644 | void adns__query_fail(adns_query qu, adns_status st) { |
| 645 | adns__reset_preserved(qu); |
| 646 | qu->answer->status= st; |
| 647 | adns__query_done(qu); |
| 648 | } |
| 649 | |
| 650 | void adns__makefinal_str(adns_query qu, char **strp) { |
| 651 | int l; |
| 652 | char *before, *after; |
| 653 | |
| 654 | before= *strp; |
| 655 | if (!before) return; |
| 656 | l= strlen(before)+1; |
| 657 | after= adns__alloc_final(qu,l); |
| 658 | memcpy(after,before,l); |
| 659 | *strp= after; |
| 660 | } |
| 661 | |
| 662 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
| 663 | void *before, *after; |
| 664 | |
| 665 | before= *blpp; |
| 666 | if (!before) return; |
| 667 | after= adns__alloc_final(qu,sz); |
| 668 | memcpy(after,before,sz); |
| 669 | *blpp= after; |
| 670 | } |