3 * - overall query management (allocation, completion)
4 * - per-query memory management
5 * - query submission and cancellation (user-visible and internal)
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.)
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 2, or (at your option)
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.
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 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
39 static adns_query query_alloc(adns_state ads,
40 const typeinfo *typei, adns_rrtype type,
41 adns_queryflags flags, struct timeval now) {
42 /* Allocate a virgin query and return it. */
45 qu= malloc(sizeof(*qu)); if (!qu) return 0;
46 qu->answer= malloc(sizeof(*qu->answer));
47 if (!qu->answer) { free(qu); return 0; }
50 qu->state= query_tosend;
51 qu->back= qu->next= qu->parent= 0;
52 LIST_INIT(qu->children);
53 LINK_INIT(qu->siblings);
54 LIST_INIT(qu->allocations);
55 qu->interim_allocd= 0;
56 qu->preserved_allocd= 0;
57 qu->final_allocspace= 0;
62 adns__vbuf_init(&qu->vb);
65 qu->cname_dglen= qu->cname_begin= 0;
67 adns__vbuf_init(&qu->search_vb);
68 qu->search_origlen= qu->search_pos= qu->search_doneabs= 0;
70 qu->id= -2; /* will be overwritten with real id before we leave adns */
75 timerclear(&qu->timeout);
76 qu->expires= now.tv_sec + MAXTTLBELIEVE;
78 memset(&qu->ctx,0,sizeof(qu->ctx));
80 qu->answer->status= adns_s_ok;
81 qu->answer->cname= qu->answer->owner= 0;
82 qu->answer->type= type;
83 qu->answer->expires= -1;
85 qu->answer->rrs.untyped= 0;
86 qu->answer->rrsz= typei->rrsz;
91 static void query_submit(adns_state ads, adns_query qu,
92 const typeinfo *typei, vbuf *qumsg_vb, int id,
93 adns_queryflags flags, struct timeval now) {
94 /* Fills in the query message in for a previously-allocated query,
95 * and submits it. Cannot fail. Takes over the memory for qumsg_vb.
99 adns__vbuf_init(qumsg_vb);
101 qu->query_dgram= malloc(qu->vb.used);
102 if (!qu->query_dgram) { adns__query_fail(qu,adns_s_nomemory); return; }
105 qu->query_dglen= qu->vb.used;
106 memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used);
108 if (typei->query_send && !(qu->flags & adns__qf_senddirect))
109 typei->query_send(qu,now);
111 adns__query_send(qu, now);
114 adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
115 const typeinfo *typei, adns_rrtype type,
116 vbuf *qumsg_vb, int id,
117 adns_queryflags flags, struct timeval now,
118 const qcontext *ctx) {
121 qu= query_alloc(ads,typei,type,flags,now);
122 if (!qu) { adns__vbuf_free(qumsg_vb); return adns_s_nomemory; }
125 memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
126 query_submit(ads,qu, typei,qumsg_vb,id,flags,now);
131 static void query_simple(adns_state ads, adns_query qu,
132 const char *owner, int ol,
133 const typeinfo *typei, adns_queryflags flags,
134 struct timeval now) {
139 stat= adns__mkquery(ads,&qu->vb,&id, owner,ol,
140 typei,qu->answer->type, flags);
142 if (stat == adns_s_querydomaintoolong && (flags & adns_qf_search)) {
143 adns__search_next(ads,qu,now);
146 adns__query_fail(qu,stat);
152 adns__vbuf_init(&qu->vb);
153 query_submit(ads,qu, typei,&vb_new,id, flags,now);
156 void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
157 const char *nextentry;
160 if (qu->search_doneabs<0) {
162 qu->search_doneabs= 1;
164 if (qu->search_pos >= ads->nsearchlist) {
165 if (qu->search_doneabs) {
166 qu->search_vb.used= qu->search_origlen;
167 stat= adns_s_nxdomain; goto x_fail;
170 qu->search_doneabs= 1;
173 nextentry= ads->searchlist[qu->search_pos++];
177 qu->search_vb.used= qu->search_origlen;
179 if (!adns__vbuf_append(&qu->search_vb,".",1) ||
180 !adns__vbuf_appendstr(&qu->search_vb,nextentry))
184 free(qu->query_dgram);
185 qu->query_dgram= 0; qu->query_dglen= 0;
187 query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used,
188 qu->typei, qu->flags, now);
192 stat= adns_s_nomemory;
194 adns__query_fail(qu,stat);
197 static int save_owner(adns_query qu, const char *owner, int ol) {
198 /* Returns 1 if OK, otherwise there was no memory. */
201 if (!(qu->flags & adns_qf_owner)) return 1;
206 ans->owner= adns__alloc_preserved(qu,ol+1); if (!ans->owner) return 0;
208 memcpy(ans->owner,owner,ol);
213 int adns_submit(adns_state ads,
216 adns_queryflags flags,
218 adns_query *query_r) {
221 const typeinfo *typei;
226 adns__consistency(ads,0,cc_entex);
228 if (!(type & adns__qtf_bigaddr) || !(type & adns__qtf_manyaf))
229 flags = (flags & ~adns__qf_afmask) | adns_qf_ipv4_only;
231 typei= adns__findtype(type);
232 if (!typei) return ENOSYS;
234 r= gettimeofday(&now,0); if (r) goto x_errno;
235 qu= query_alloc(ads,typei,type,flags,now); if (!qu) goto x_errno;
237 qu->ctx.ext= context;
239 memset(&qu->ctx.info,0,sizeof(qu->ctx.info));
244 if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; }
245 if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; }
247 if (ol>=1 && owner[ol-1]=='.' && (ol<2 || owner[ol-2]!='\\')) {
248 flags &= ~adns_qf_search;
253 if (flags & adns_qf_search) {
254 r= adns__vbuf_append(&qu->search_vb,owner,ol);
255 if (!r) { stat= adns_s_nomemory; goto x_adnsfail; }
257 for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++);
258 qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0;
259 qu->search_origlen= ol;
260 adns__search_next(ads,qu,now);
262 if (flags & adns_qf_owner) {
263 if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; }
265 query_simple(ads,qu, owner,ol, typei,flags, now);
267 adns__autosys(ads,now);
268 adns__consistency(ads,qu,cc_entex);
272 adns__query_fail(qu,stat);
273 adns__consistency(ads,qu,cc_entex);
279 adns__consistency(ads,0,cc_entex);
283 static const char *default_zone = "<magic>";
285 int adns_submit_reverse_any(adns_state ads,
286 const struct sockaddr *addr,
289 adns_queryflags flags,
291 adns_query *query_r) {
292 char *buf, *buf_free, *p;
297 flags &= ~adns_qf_search;
299 switch (addr->sa_family) {
301 ai = &adns__inet_afinfo;
302 if (zone == default_zone) zone = "in-addr.arpa";
305 ai = &adns__inet6_afinfo;
306 if (zone == default_zone) zone = "ip6.arpa";
312 lreq= strlen(zone) + ai->nrevcomp*(ai->revcompwd + 1) + 1;
313 if (lreq > sizeof(shortbuf)) {
315 if (!buf) return errno;
322 p = ai->rev_mkname(addr, buf);
326 r= adns_submit(ads,buf,type,flags,context,query_r);
331 int adns_submit_reverse(adns_state ads,
332 const struct sockaddr *addr,
334 adns_queryflags flags,
336 adns_query *query_r) {
337 if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL;
338 return adns_submit_reverse_any(ads,addr,default_zone,
339 type,flags,context,query_r);
342 int adns_synchronous(adns_state ads,
345 adns_queryflags flags,
346 adns_answer **answer_r) {
350 r= adns_submit(ads,owner,type,flags,0,&qu);
353 r= adns_wait(ads,&qu,answer_r,0);
354 if (r) adns_cancel(qu);
359 static void *alloc_common(adns_query qu, size_t sz) {
362 if (!sz) return qu; /* Any old pointer will do */
363 assert(!qu->final_allocspace);
364 an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
366 LIST_LINK_TAIL(qu->allocations,an);
368 return (byte*)an + MEM_ROUND(sizeof(*an));
371 void *adns__alloc_interim(adns_query qu, size_t sz) {
375 rv= alloc_common(qu,sz);
377 qu->interim_allocd += sz;
381 void *adns__alloc_preserved(adns_query qu, size_t sz) {
385 rv= adns__alloc_interim(qu,sz);
387 qu->preserved_allocd += sz;
391 void adns__free_interim(adns_query qu, void *p) {
396 an = (allocnode *)((byte *)p - MEM_ROUND(sizeof(allocnode)));
397 sz = MEM_ROUND(an->sz);
398 LIST_UNLINK(qu->allocations, an);
400 qu->interim_allocd -= sz;
403 void *adns__alloc_mine(adns_query qu, size_t sz) {
404 return alloc_common(qu,MEM_ROUND(sz));
407 void adns__transfer_interim(adns_query from, adns_query to,
408 void *block, size_t sz) {
412 an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
414 assert(!to->final_allocspace);
415 assert(!from->final_allocspace);
417 LIST_UNLINK(from->allocations,an);
418 LIST_LINK_TAIL(to->allocations,an);
421 from->interim_allocd -= sz;
422 to->interim_allocd += sz;
424 if (to->expires > from->expires) to->expires= from->expires;
427 void *adns__alloc_final(adns_query qu, size_t sz) {
428 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
429 * each allocation, and use final_allocspace to point to the next free
435 rp= qu->final_allocspace;
437 qu->interim_allocd -= sz;
438 assert(qu->interim_allocd>=0);
439 qu->final_allocspace= (byte*)rp + sz;
443 void adns__cancel_children(adns_query qu) {
444 adns_query cqu, ncqu;
446 for (cqu= qu->children.head; cqu; cqu= ncqu) {
447 ncqu= cqu->siblings.next;
452 void adns__reset_preserved(adns_query qu) {
453 assert(!qu->final_allocspace);
454 adns__cancel_children(qu);
456 qu->answer->rrs.untyped= 0;
457 qu->interim_allocd= qu->preserved_allocd;
460 static void free_query_allocs(adns_query qu) {
463 adns__cancel_children(qu);
464 for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
465 LIST_INIT(qu->allocations);
466 adns__vbuf_free(&qu->vb);
467 adns__vbuf_free(&qu->search_vb);
468 free(qu->query_dgram);
472 void adns_cancel(adns_query qu) {
476 adns__consistency(ads,qu,cc_entex);
477 if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.);
480 LIST_UNLINK(ads->udpw,qu);
483 LIST_UNLINK(ads->tcpw,qu);
486 LIST_UNLINK(ads->childw,qu);
489 LIST_UNLINK(ads->output,qu);
494 free_query_allocs(qu);
497 adns__consistency(ads,0,cc_entex);
500 void adns__update_expires(adns_query qu, unsigned long ttl,
501 struct timeval now) {
504 assert(ttl <= MAXTTLBELIEVE);
505 max= now.tv_sec + ttl;
506 if (qu->expires < max) return;
510 static void makefinal_query(adns_query qu) {
516 if (qu->interim_allocd) {
517 ans= realloc(qu->answer,
518 MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
519 if (!ans) goto x_nomem;
523 qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
524 adns__makefinal_str(qu,&ans->cname);
525 adns__makefinal_str(qu,&ans->owner);
528 adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
530 for (rrn=0; rrn<ans->nrrs; rrn++)
531 qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
534 free_query_allocs(qu);
538 qu->preserved_allocd= 0;
539 qu->answer->cname= 0;
540 qu->answer->owner= 0;
541 adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */
543 qu->answer->status= adns_s_nomemory;
544 free_query_allocs(qu);
547 void adns__query_done(adns_query qu) {
551 adns__cancel_children(qu);
556 if (qu->flags & adns_qf_search && ans->status != adns_s_nomemory) {
557 if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) {
558 adns__query_fail(qu,adns_s_nomemory);
563 if (ans->nrrs && qu->typei->diff_needswap) {
564 if (!adns__vbuf_ensure(&qu->vb,ans->rrsz)) {
565 adns__query_fail(qu,adns_s_nomemory);
568 adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
570 (int(*)(void*, const void*, const void*))
571 qu->typei->diff_needswap,
574 if (ans->nrrs && qu->typei->postsort) {
575 qu->typei->postsort(qu->ads, ans->rrs.bytes, ans->nrrs, qu->typei);
578 ans->expires= qu->expires;
581 LIST_UNLINK_PART(parent->children,qu,siblings.);
582 LIST_UNLINK(qu->ads->childw,parent);
583 qu->ctx.callback(parent,qu);
584 free_query_allocs(qu);
589 LIST_LINK_TAIL(qu->ads->output,qu);
590 qu->state= query_done;
594 void adns__query_fail(adns_query qu, adns_status stat) {
595 adns__reset_preserved(qu);
596 qu->answer->status= stat;
597 adns__query_done(qu);
600 void adns__makefinal_str(adns_query qu, char **strp) {
602 char *before, *after;
607 after= adns__alloc_final(qu,l);
608 memcpy(after,before,l);
612 void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
613 void *before, *after;
617 after= adns__alloc_final(qu,sz);
618 memcpy(after,before,sz);