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, vbuf *qumsg_vb,
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,typei->typekey,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;
298 #define CHECK_PTR do { \
299 if (type == adns_r_ptr && (ol < 5 || \
300 strncmp(owner + ol - 5, ".arpa", 5))) { \
301 ads->nextid++; adns__autosys(ads,now); \
302 stat= adns_s_querydomainwrong; goto x_adnsfail; \
306 if (flags & adns_qf_search) {
308 r= adns__vbuf_append(&qu->search_vb,owner,ol);
309 if (!r) { stat= adns_s_nomemory; goto x_adnsfail; }
311 for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++);
312 qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0;
313 qu->search_origlen= ol;
314 adns__search_next(ads,qu,now);
316 if (flags & adns_qf_owner) {
317 if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; }
320 query_simple(ads,qu, owner,ol, typei,flags, now);
322 adns__autosys(ads,now);
323 adns__consistency(ads,qu,cc_entex);
329 adns__query_fail(qu,stat);
330 adns__consistency(ads,qu,cc_entex);
336 adns__consistency(ads,0,cc_entex);
340 int adns_submit_reverse_any(adns_state ads,
341 const struct sockaddr *addr,
344 adns_queryflags flags,
346 adns_query *query_r) {
347 const unsigned char *iaddr;
348 char *buf, *buf_free;
352 flags &= ~adns_qf_search;
354 if (addr->sa_family != AF_INET) return ENOSYS;
355 iaddr= (const unsigned char*)
356 &(((const struct sockaddr_in*)addr) -> sin_addr);
358 lreq= strlen(zone) + 4*4 + 1;
359 if (lreq > sizeof(shortbuf)) {
360 buf= malloc(strlen(zone) + 4*4 + 1);
361 if (!buf) return errno;
367 sprintf(buf, "%d.%d.%d.%d.%s", iaddr[3], iaddr[2], iaddr[1], iaddr[0], zone);
369 r= adns_submit(ads,buf,type,flags,context,query_r);
374 int adns_submit_reverse(adns_state ads,
375 const struct sockaddr *addr,
377 adns_queryflags flags,
379 adns_query *query_r) {
380 if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL;
381 return adns_submit_reverse_any(ads,addr,"in-addr.arpa",
382 type,flags,context,query_r);
385 int adns_synchronous(adns_state ads,
388 adns_queryflags flags,
389 adns_answer **answer_r) {
393 r= adns_submit(ads,owner,type,flags,0,&qu);
396 r= adns_wait(ads,&qu,answer_r,0);
397 if (r) adns_cancel(qu);
402 static void *alloc_common(adns_query qu, size_t sz) {
405 if (!sz) return qu; /* Any old pointer will do */
406 assert(!qu->final_allocspace);
407 an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
409 LIST_LINK_TAIL(qu->allocations,an);
410 return (byte*)an + MEM_ROUND(sizeof(*an));
413 void *adns__alloc_interim(adns_query qu, size_t sz) {
417 rv= alloc_common(qu,sz);
419 qu->interim_allocd += sz;
423 void *adns__alloc_preserved(adns_query qu, size_t sz) {
427 rv= adns__alloc_interim(qu,sz);
429 qu->preserved_allocd += sz;
433 void *adns__alloc_mine(adns_query qu, size_t sz) {
434 return alloc_common(qu,MEM_ROUND(sz));
437 void adns__transfer_interim(adns_query from, adns_query to,
438 void *block, size_t sz) {
442 an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
444 assert(!to->final_allocspace);
445 assert(!from->final_allocspace);
447 LIST_UNLINK(from->allocations,an);
448 LIST_LINK_TAIL(to->allocations,an);
451 from->interim_allocd -= sz;
452 to->interim_allocd += sz;
454 if (to->expires > from->expires) to->expires= from->expires;
457 void *adns__alloc_final(adns_query qu, size_t sz) {
458 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
459 * each allocation, and use final_allocspace to point to the next free
465 rp= qu->final_allocspace;
467 qu->interim_allocd -= sz;
468 assert(qu->interim_allocd>=0);
469 qu->final_allocspace= (byte*)rp + sz;
473 static void cancel_children(adns_query qu) {
474 adns_query cqu, ncqu;
476 for (cqu= qu->children.head; cqu; cqu= ncqu) {
477 ncqu= cqu->siblings.next;
482 void adns__reset_preserved(adns_query qu) {
483 assert(!qu->final_allocspace);
486 qu->answer->rrs.untyped= 0;
487 qu->interim_allocd= qu->preserved_allocd;
490 static void free_query_allocs(adns_query qu) {
494 for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
495 LIST_INIT(qu->allocations);
496 adns__vbuf_free(&qu->vb);
497 adns__vbuf_free(&qu->search_vb);
498 free(qu->query_dgram);
502 void adns_cancel(adns_query qu) {
506 adns__consistency(ads,qu,cc_entex);
507 if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.);
510 LIST_UNLINK(ads->udpw,qu);
513 LIST_UNLINK(ads->tcpw,qu);
516 LIST_UNLINK(ads->childw,qu);
519 LIST_UNLINK(ads->output,qu);
524 free_query_allocs(qu);
527 adns__consistency(ads,0,cc_entex);
530 void adns__update_expires(adns_query qu, unsigned long ttl,
531 struct timeval now) {
534 assert(ttl <= MAXTTLBELIEVE);
535 max= now.tv_sec + ttl;
536 if (qu->expires < max) return;
540 static void makefinal_query(adns_query qu) {
546 if (qu->interim_allocd) {
547 ans= realloc(qu->answer,
548 MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
549 if (!ans) goto x_nomem;
553 qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
554 adns__makefinal_str(qu,&ans->cname);
555 adns__makefinal_str(qu,&ans->owner);
558 adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
560 for (rrn=0; rrn<ans->nrrs; rrn++)
561 qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
564 free_query_allocs(qu);
568 qu->preserved_allocd= 0;
569 qu->answer->cname= 0;
570 qu->answer->owner= 0;
571 adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */
573 qu->answer->status= adns_s_nomemory;
574 free_query_allocs(qu);
577 void adns__query_done(adns_query qu) {
586 if (qu->flags & adns_qf_search && ans->status != adns_s_nomemory) {
587 if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) {
588 adns__query_fail(qu,adns_s_nomemory);
593 if (ans->nrrs && qu->typei->diff_needswap) {
594 if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
595 adns__query_fail(qu,adns_s_nomemory);
598 adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
600 (int(*)(void*, const void*, const void*))
601 qu->typei->diff_needswap,
604 if (ans->nrrs && qu->typei->postsort) {
605 qu->typei->postsort(qu->ads, ans->rrs.bytes, ans->nrrs, qu->typei);
608 ans->expires= qu->expires;
611 LIST_UNLINK_PART(parent->children,qu,siblings.);
612 LIST_UNLINK(qu->ads->childw,parent);
613 qu->ctx.callback(parent,qu);
614 free_query_allocs(qu);
619 LIST_LINK_TAIL(qu->ads->output,qu);
620 qu->state= query_done;
624 void adns__query_fail(adns_query qu, adns_status stat) {
625 adns__reset_preserved(qu);
626 qu->answer->status= stat;
627 adns__query_done(qu);
630 void adns__makefinal_str(adns_query qu, char **strp) {
632 char *before, *after;
637 after= adns__alloc_final(qu,l);
638 memcpy(after,before,l);
642 void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
643 void *before, *after;
647 after= adns__alloc_final(qu,sz);
648 memcpy(after,before,sz);