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 adns__query_send(qu,now);
111 adns_status adns__ckl_hostname(adns_state ads, adns_queryflags flags,
112 union checklabel_state *cls,
113 qcontext *ctx, int labnum,
114 const char *label, int lablen)
118 if (flags & adns_qf_quoteok_query) return adns_s_ok;
119 for (i=0; i<lablen; i++) {
122 if (!i) return adns_s_querydomaininvalid;
123 } else if (!ctype_alpha(c) && !ctype_digit(c)) {
124 return adns_s_querydomaininvalid;
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)
136 int labnum= 0, labstart, lablen;
137 union checklabel_state cls;
139 adns__findlabel_start(&fls,ads, -1,0, dgram,dglen,dglen, DNS_HDRSIZE,0);
141 err= adns__findlabel_next(&fls, &lablen,&labstart);
142 assert(!err); assert(lablen >= 0);
143 err= typei->checklabel(ads,flags, &cls,ctx,
144 labnum++, dgram+labstart,lablen);
150 adns_status adns__internal_submit(adns_state ads, adns_query *query_r,
151 const typeinfo *typei, adns_rrtype type,
152 vbuf *qumsg_vb, int id,
153 adns_queryflags flags, struct timeval now,
158 err= check_domain_name(ads, flags,ctx,typei, qumsg_vb->buf,qumsg_vb->used);
160 qu= query_alloc(ads,typei,type,flags,now);
161 if (!qu) { err = adns_s_nomemory; goto x_err; }
164 memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
165 query_submit(ads,qu, typei,qumsg_vb,id,flags,now);
170 adns__vbuf_free(qumsg_vb);
174 static void query_simple(adns_state ads, adns_query qu,
175 const char *owner, int ol,
176 const typeinfo *typei, adns_queryflags flags,
177 struct timeval now) {
182 stat= adns__mkquery(ads,&qu->vb,&id, owner,ol,
183 typei,qu->answer->type, flags);
185 if (stat == adns_s_querydomaintoolong && (flags & adns_qf_search)) {
186 adns__search_next(ads,qu,now);
189 adns__query_fail(qu,stat);
194 stat= check_domain_name(ads, flags,&qu->ctx,typei, qu->vb.buf,qu->vb.used);
195 if (stat) { adns__query_fail(qu,stat); return; }
198 adns__vbuf_init(&qu->vb);
199 query_submit(ads,qu, typei,&vb_new,id, flags,now);
202 void adns__search_next(adns_state ads, adns_query qu, struct timeval now) {
203 const char *nextentry;
206 if (qu->search_doneabs<0) {
208 qu->search_doneabs= 1;
210 if (qu->search_pos >= ads->nsearchlist) {
211 if (qu->search_doneabs) {
212 qu->search_vb.used= qu->search_origlen;
213 stat= adns_s_nxdomain; goto x_fail;
216 qu->search_doneabs= 1;
219 nextentry= ads->searchlist[qu->search_pos++];
223 qu->search_vb.used= qu->search_origlen;
225 if (!adns__vbuf_append(&qu->search_vb,".",1) ||
226 !adns__vbuf_appendstr(&qu->search_vb,nextentry))
230 free(qu->query_dgram);
231 qu->query_dgram= 0; qu->query_dglen= 0;
233 query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used,
234 qu->typei, qu->flags, now);
238 stat= adns_s_nomemory;
240 adns__query_fail(qu,stat);
243 static int save_owner(adns_query qu, const char *owner, int ol) {
244 /* Returns 1 if OK, otherwise there was no memory. */
247 if (!(qu->flags & adns_qf_owner)) return 1;
252 ans->owner= adns__alloc_preserved(qu,ol+1); if (!ans->owner) return 0;
254 memcpy(ans->owner,owner,ol);
259 int adns_submit(adns_state ads,
262 adns_queryflags flags,
264 adns_query *query_r) {
267 const typeinfo *typei;
272 adns__consistency(ads,0,cc_entex);
274 typei= adns__findtype(type);
275 if (!typei) return ENOSYS;
277 r= gettimeofday(&now,0); if (r) goto x_errno;
278 qu= query_alloc(ads,typei,type,flags,now); if (!qu) goto x_errno;
280 qu->ctx.ext= context;
282 memset(&qu->ctx.pinfo,0,sizeof(qu->ctx.pinfo));
283 memset(&qu->ctx.tinfo,0,sizeof(qu->ctx.tinfo));
288 if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; }
289 if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; }
291 if (ol>=1 && owner[ol-1]=='.' && (ol<2 || owner[ol-2]!='\\')) {
292 flags &= ~adns_qf_search;
297 if (flags & adns_qf_search) {
298 r= adns__vbuf_append(&qu->search_vb,owner,ol);
299 if (!r) { stat= adns_s_nomemory; goto x_adnsfail; }
301 for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++);
302 qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0;
303 qu->search_origlen= ol;
304 adns__search_next(ads,qu,now);
306 if (flags & adns_qf_owner) {
307 if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; }
309 query_simple(ads,qu, owner,ol, typei,flags, now);
311 adns__autosys(ads,now);
312 adns__consistency(ads,qu,cc_entex);
316 adns__query_fail(qu,stat);
317 adns__consistency(ads,qu,cc_entex);
323 adns__consistency(ads,0,cc_entex);
327 int adns_submit_reverse_any(adns_state ads,
328 const struct sockaddr *addr,
331 adns_queryflags flags,
333 adns_query *query_r) {
334 const unsigned char *iaddr;
335 char *buf, *buf_free;
339 flags &= ~adns_qf_search;
341 if (addr->sa_family != AF_INET) return ENOSYS;
342 iaddr= (const unsigned char*)
343 &(((const struct sockaddr_in*)addr) -> sin_addr);
345 lreq= strlen(zone) + 4*4 + 1;
346 if (lreq > sizeof(shortbuf)) {
347 buf= malloc(strlen(zone) + 4*4 + 1);
348 if (!buf) return errno;
354 sprintf(buf, "%d.%d.%d.%d.%s", iaddr[3], iaddr[2], iaddr[1], iaddr[0], zone);
356 r= adns_submit(ads,buf,type,flags,context,query_r);
361 int adns_submit_reverse(adns_state ads,
362 const struct sockaddr *addr,
364 adns_queryflags flags,
366 adns_query *query_r) {
367 if (((type^adns_r_ptr) & adns_rrt_reprmask) &&
368 ((type^adns_r_ptr_raw) & adns_rrt_reprmask))
370 return adns_submit_reverse_any(ads,addr,"in-addr.arpa",
371 type,flags,context,query_r);
374 int adns_synchronous(adns_state ads,
377 adns_queryflags flags,
378 adns_answer **answer_r) {
382 r= adns_submit(ads,owner,type,flags,0,&qu);
385 r= adns_wait(ads,&qu,answer_r,0);
386 if (r) adns_cancel(qu);
391 static void *alloc_common(adns_query qu, size_t sz) {
394 if (!sz) return qu; /* Any old pointer will do */
395 assert(!qu->final_allocspace);
396 an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
398 LIST_LINK_TAIL(qu->allocations,an);
399 return (byte*)an + MEM_ROUND(sizeof(*an));
402 void *adns__alloc_interim(adns_query qu, size_t sz) {
406 rv= alloc_common(qu,sz);
408 qu->interim_allocd += sz;
412 void *adns__alloc_preserved(adns_query qu, size_t sz) {
416 rv= adns__alloc_interim(qu,sz);
418 qu->preserved_allocd += sz;
422 void *adns__alloc_mine(adns_query qu, size_t sz) {
423 return alloc_common(qu,MEM_ROUND(sz));
426 void adns__transfer_interim(adns_query from, adns_query to,
427 void *block, size_t sz) {
431 an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
433 assert(!to->final_allocspace);
434 assert(!from->final_allocspace);
436 LIST_UNLINK(from->allocations,an);
437 LIST_LINK_TAIL(to->allocations,an);
440 from->interim_allocd -= sz;
441 to->interim_allocd += sz;
443 if (to->expires > from->expires) to->expires= from->expires;
446 void *adns__alloc_final(adns_query qu, size_t sz) {
447 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
448 * each allocation, and use final_allocspace to point to the next free
454 rp= qu->final_allocspace;
456 qu->interim_allocd -= sz;
457 assert(qu->interim_allocd>=0);
458 qu->final_allocspace= (byte*)rp + sz;
462 static void cancel_children(adns_query qu) {
463 adns_query cqu, ncqu;
465 for (cqu= qu->children.head; cqu; cqu= ncqu) {
466 ncqu= cqu->siblings.next;
471 void adns__reset_preserved(adns_query qu) {
472 assert(!qu->final_allocspace);
475 qu->answer->rrs.untyped= 0;
476 qu->interim_allocd= qu->preserved_allocd;
479 static void free_query_allocs(adns_query qu) {
483 for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
484 LIST_INIT(qu->allocations);
485 adns__vbuf_free(&qu->vb);
486 adns__vbuf_free(&qu->search_vb);
487 free(qu->query_dgram);
491 void adns_cancel(adns_query qu) {
495 adns__consistency(ads,qu,cc_entex);
496 if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.);
499 LIST_UNLINK(ads->udpw,qu);
502 LIST_UNLINK(ads->tcpw,qu);
505 LIST_UNLINK(ads->childw,qu);
508 LIST_UNLINK(ads->output,qu);
513 free_query_allocs(qu);
516 adns__consistency(ads,0,cc_entex);
519 void adns__update_expires(adns_query qu, unsigned long ttl,
520 struct timeval now) {
523 assert(ttl <= MAXTTLBELIEVE);
524 max= now.tv_sec + ttl;
525 if (qu->expires < max) return;
529 static void makefinal_query(adns_query qu) {
535 if (qu->interim_allocd) {
536 ans= realloc(qu->answer,
537 MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
538 if (!ans) goto x_nomem;
542 qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
543 adns__makefinal_str(qu,&ans->cname);
544 adns__makefinal_str(qu,&ans->owner);
547 adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
549 for (rrn=0; rrn<ans->nrrs; rrn++)
550 qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
553 free_query_allocs(qu);
557 qu->preserved_allocd= 0;
558 qu->answer->cname= 0;
559 qu->answer->owner= 0;
560 adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */
562 qu->answer->status= adns_s_nomemory;
563 free_query_allocs(qu);
566 void adns__query_done(adns_query qu) {
575 if (qu->flags & adns_qf_search && ans->status != adns_s_nomemory) {
576 if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) {
577 adns__query_fail(qu,adns_s_nomemory);
582 if (ans->nrrs && qu->typei->diff_needswap) {
583 if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
584 adns__query_fail(qu,adns_s_nomemory);
587 adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
589 (int(*)(void*, const void*, const void*))
590 qu->typei->diff_needswap,
593 if (ans->nrrs && qu->typei->postsort) {
594 qu->typei->postsort(qu->ads, ans->rrs.bytes, ans->nrrs, qu->typei);
597 ans->expires= qu->expires;
600 LIST_UNLINK_PART(parent->children,qu,siblings.);
601 LIST_UNLINK(qu->ads->childw,parent);
602 qu->ctx.callback(parent,qu);
603 free_query_allocs(qu);
608 LIST_LINK_TAIL(qu->ads->output,qu);
609 qu->state= query_done;
613 void adns__query_fail(adns_query qu, adns_status stat) {
614 adns__reset_preserved(qu);
615 qu->answer->status= stat;
616 adns__query_done(qu);
619 void adns__makefinal_str(adns_query qu, char **strp) {
621 char *before, *after;
626 after= adns__alloc_final(qu,l);
627 memcpy(after,before,l);
631 void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
632 void *before, *after;
636 after= adns__alloc_final(qu,sz);
637 memcpy(after,before,sz);