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
->getrrsz ? typei
->getrrsz(type
) : 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 (flags
& adns__qf_nosend
)
110 else if (typei
->query_send
&& !(flags
& adns__qf_senddirect
))
111 typei
->query_send(qu
,now
);
113 adns__query_send(qu
, now
);
116 adns_status
adns__internal_submit(adns_state ads
, adns_query
*query_r
,
117 const typeinfo
*typei
, adns_rrtype type
,
118 vbuf
*qumsg_vb
, int id
,
119 adns_queryflags flags
, struct timeval now
,
120 const qcontext
*ctx
) {
123 qu
= query_alloc(ads
,typei
,type
,flags
& ~adns__qf_nosend
,now
);
124 if (!qu
) { adns__vbuf_free(qumsg_vb
); return adns_s_nomemory
; }
127 memcpy(&qu
->ctx
,ctx
,sizeof(qu
->ctx
));
128 query_submit(ads
,qu
, typei
,qumsg_vb
,id
,flags
,now
);
133 static void query_simple(adns_state ads
, adns_query qu
,
134 const char *owner
, int ol
,
135 const typeinfo
*typei
, adns_queryflags flags
,
136 struct timeval now
) {
141 stat
= adns__mkquery(ads
,&qu
->vb
,&id
, owner
,ol
,
142 typei
,qu
->answer
->type
, flags
);
144 if (stat
== adns_s_querydomaintoolong
&& (flags
& adns_qf_search
)) {
145 adns__search_next(ads
,qu
,now
);
148 adns__query_fail(qu
,stat
);
154 adns__vbuf_init(&qu
->vb
);
155 query_submit(ads
,qu
, typei
,&vb_new
,id
, flags
,now
);
158 void adns__search_next(adns_state ads
, adns_query qu
, struct timeval now
) {
159 const char *nextentry
;
162 if (qu
->search_doneabs
<0) {
164 qu
->search_doneabs
= 1;
166 if (qu
->search_pos
>= ads
->nsearchlist
) {
167 if (qu
->search_doneabs
) {
168 qu
->search_vb
.used
= qu
->search_origlen
;
169 stat
= adns_s_nxdomain
; goto x_fail
;
172 qu
->search_doneabs
= 1;
175 nextentry
= ads
->searchlist
[qu
->search_pos
++];
179 qu
->search_vb
.used
= qu
->search_origlen
;
181 if (!adns__vbuf_append(&qu
->search_vb
,".",1) ||
182 !adns__vbuf_appendstr(&qu
->search_vb
,nextentry
))
186 free(qu
->query_dgram
);
187 qu
->query_dgram
= 0; qu
->query_dglen
= 0;
189 query_simple(ads
,qu
, qu
->search_vb
.buf
, qu
->search_vb
.used
,
190 qu
->typei
, qu
->flags
, now
);
194 stat
= adns_s_nomemory
;
196 adns__query_fail(qu
,stat
);
199 static int save_owner(adns_query qu
, const char *owner
, int ol
) {
200 /* Returns 1 if OK, otherwise there was no memory. */
203 if (!(qu
->flags
& adns_qf_owner
)) return 1;
208 ans
->owner
= adns__alloc_preserved(qu
,ol
+1); if (!ans
->owner
) return 0;
210 memcpy(ans
->owner
,owner
,ol
);
215 int adns_submit(adns_state ads
,
218 adns_queryflags flags
,
220 adns_query
*query_r
) {
223 const typeinfo
*typei
;
228 adns__consistency(ads
,0,cc_entex
);
230 if (!(type
& adns__qtf_bigaddr
) || !(type
& adns__qtf_manyaf
))
231 flags
= (flags
& ~adns__qf_afmask
) | adns_qf_ipv4_only
;
233 typei
= adns__findtype(type
);
234 if (!typei
) return ENOSYS
;
236 r
= gettimeofday(&now
,0); if (r
) goto x_errno
;
237 qu
= query_alloc(ads
,typei
,type
,flags
,now
); if (!qu
) goto x_errno
;
239 qu
->ctx
.ext
= context
;
241 memset(&qu
->ctx
.pinfo
,0,sizeof(qu
->ctx
.pinfo
));
242 memset(&qu
->ctx
.tinfo
,0,sizeof(qu
->ctx
.tinfo
));
247 if (!ol
) { stat
= adns_s_querydomaininvalid
; goto x_adnsfail
; }
248 if (ol
>DNS_MAXDOMAIN
+1) { stat
= adns_s_querydomaintoolong
; goto x_adnsfail
; }
250 if (ol
>=1 && owner
[ol
-1]=='.' && (ol
<2 || owner
[ol
-2]!='\\')) {
251 flags
&= ~adns_qf_search
;
256 if (flags
& adns_qf_search
) {
257 r
= adns__vbuf_append(&qu
->search_vb
,owner
,ol
);
258 if (!r
) { stat
= adns_s_nomemory
; goto x_adnsfail
; }
260 for (ndots
=0, p
=owner
; (p
= strchr(p
,'.')); p
++, ndots
++);
261 qu
->search_doneabs
= (ndots
>= ads
->searchndots
) ?
-1 : 0;
262 qu
->search_origlen
= ol
;
263 adns__search_next(ads
,qu
,now
);
265 if (flags
& adns_qf_owner
) {
266 if (!save_owner(qu
,owner
,ol
)) { stat
= adns_s_nomemory
; goto x_adnsfail
; }
268 query_simple(ads
,qu
, owner
,ol
, typei
,flags
, now
);
270 adns__autosys(ads
,now
);
271 adns__consistency(ads
,qu
,cc_entex
);
275 adns__query_fail(qu
,stat
);
276 adns__consistency(ads
,qu
,cc_entex
);
282 adns__consistency(ads
,0,cc_entex
);
286 static const char *default_zone
= "<magic>";
288 int adns_submit_reverse_any(adns_state ads
,
289 const struct sockaddr
*addr
,
292 adns_queryflags flags
,
294 adns_query
*query_r
) {
295 char *buf
, *buf_free
, *p
;
300 flags
&= ~adns_qf_search
;
302 switch (addr
->sa_family
) {
304 ai
= &adns__inet_afinfo
;
305 if (zone
== default_zone
) zone
= "in-addr.arpa";
308 ai
= &adns__inet6_afinfo
;
309 if (zone
== default_zone
) zone
= "ip6.arpa";
315 lreq
= strlen(zone
) + ai
->nrevcomp
*(ai
->revcompwd
+ 1) + 1;
316 if (lreq
> sizeof(shortbuf
)) {
318 if (!buf
) return errno
;
325 p
= ai
->rev_mkname(addr
, buf
);
329 r
= adns_submit(ads
,buf
,type
,flags
,context
,query_r
);
334 int adns_submit_reverse(adns_state ads
,
335 const struct sockaddr
*addr
,
337 adns_queryflags flags
,
339 adns_query
*query_r
) {
340 if (type
!= adns_r_ptr
&& type
!= adns_r_ptr_raw
) return EINVAL
;
341 return adns_submit_reverse_any(ads
,addr
,default_zone
,
342 type
,flags
,context
,query_r
);
345 int adns_synchronous(adns_state ads
,
348 adns_queryflags flags
,
349 adns_answer
**answer_r
) {
353 r
= adns_submit(ads
,owner
,type
,flags
,0,&qu
);
356 r
= adns_wait(ads
,&qu
,answer_r
,0);
357 if (r
) adns_cancel(qu
);
362 static void *alloc_common(adns_query qu
, size_t sz
) {
365 if (!sz
) return qu
; /* Any old pointer will do */
366 assert(!qu
->final_allocspace
);
367 an
= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an
)) + sz
));
369 LIST_LINK_TAIL(qu
->allocations
,an
);
371 return (byte
*)an
+ MEM_ROUND(sizeof(*an
));
374 void *adns__alloc_interim(adns_query qu
, size_t sz
) {
378 rv
= alloc_common(qu
,sz
);
380 qu
->interim_allocd
+= sz
;
384 void *adns__alloc_preserved(adns_query qu
, size_t sz
) {
388 rv
= adns__alloc_interim(qu
,sz
);
390 qu
->preserved_allocd
+= sz
;
394 static allocnode
*alloc_info(adns_query qu
, void *p
, size_t *sz_r
)
398 if (!p
|| p
== qu
) { *sz_r
= 0; return 0; }
399 an
= (allocnode
*)((byte
*)p
- MEM_ROUND(sizeof(allocnode
)));
400 *sz_r
= MEM_ROUND(an
->sz
);
404 void adns__free_interim(adns_query qu
, void *p
) {
406 allocnode
*an
= alloc_info(qu
, p
, &sz
);
409 assert(!qu
->final_allocspace
);
410 LIST_UNLINK(qu
->allocations
, an
);
412 qu
->interim_allocd
-= sz
;
415 void *adns__alloc_mine(adns_query qu
, size_t sz
) {
416 return alloc_common(qu
,MEM_ROUND(sz
));
419 void adns__transfer_interim(adns_query from
, adns_query to
, void *block
) {
421 allocnode
*an
= alloc_info(from
, block
, &sz
);
425 assert(!to
->final_allocspace
);
426 assert(!from
->final_allocspace
);
428 LIST_UNLINK(from
->allocations
,an
);
429 LIST_LINK_TAIL(to
->allocations
,an
);
431 from
->interim_allocd
-= sz
;
432 to
->interim_allocd
+= sz
;
434 if (to
->expires
> from
->expires
) to
->expires
= from
->expires
;
437 void *adns__alloc_final(adns_query qu
, size_t sz
) {
438 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
439 * each allocation, and use final_allocspace to point to the next free
445 rp
= qu
->final_allocspace
;
447 qu
->interim_allocd
-= sz
;
448 assert(qu
->interim_allocd
>=0);
449 qu
->final_allocspace
= (byte
*)rp
+ sz
;
453 void adns__cancel_children(adns_query qu
) {
454 adns_query cqu
, ncqu
;
456 for (cqu
= qu
->children
.head
; cqu
; cqu
= ncqu
) {
457 ncqu
= cqu
->siblings
.next
;
462 void adns__reset_preserved(adns_query qu
) {
463 assert(!qu
->final_allocspace
);
464 adns__cancel_children(qu
);
466 qu
->answer
->rrs
.untyped
= 0;
467 qu
->interim_allocd
= qu
->preserved_allocd
;
470 static void free_query_allocs(adns_query qu
) {
473 adns__cancel_children(qu
);
474 for (an
= qu
->allocations
.head
; an
; an
= ann
) { ann
= an
->next
; free(an
); }
475 LIST_INIT(qu
->allocations
);
476 adns__vbuf_free(&qu
->vb
);
477 adns__vbuf_free(&qu
->search_vb
);
478 free(qu
->query_dgram
);
482 void adns_cancel(adns_query qu
) {
486 adns__consistency(ads
,qu
,cc_entex
);
487 if (qu
->parent
) LIST_UNLINK_PART(qu
->parent
->children
,qu
,siblings
.);
490 LIST_UNLINK(ads
->udpw
,qu
);
493 LIST_UNLINK(ads
->tcpw
,qu
);
496 LIST_UNLINK(ads
->childw
,qu
);
499 LIST_UNLINK(ads
->output
,qu
);
504 free_query_allocs(qu
);
507 adns__consistency(ads
,0,cc_entex
);
510 void adns__update_expires(adns_query qu
, unsigned long ttl
,
511 struct timeval now
) {
514 assert(ttl
<= MAXTTLBELIEVE
);
515 max
= now
.tv_sec
+ ttl
;
516 if (qu
->expires
< max
) return;
520 static void makefinal_query(adns_query qu
) {
526 if (qu
->interim_allocd
) {
527 ans
= realloc(qu
->answer
,
528 MEM_ROUND(MEM_ROUND(sizeof(*ans
)) + qu
->interim_allocd
));
529 if (!ans
) goto x_nomem
;
533 qu
->final_allocspace
= (byte
*)ans
+ MEM_ROUND(sizeof(*ans
));
534 adns__makefinal_str(qu
,&ans
->cname
);
535 adns__makefinal_str(qu
,&ans
->owner
);
538 adns__makefinal_block(qu
, &ans
->rrs
.untyped
, ans
->nrrs
*ans
->rrsz
);
540 for (rrn
=0; rrn
<ans
->nrrs
; rrn
++)
541 qu
->typei
->makefinal(qu
, ans
->rrs
.bytes
+ rrn
*ans
->rrsz
);
544 free_query_allocs(qu
);
548 qu
->preserved_allocd
= 0;
549 qu
->answer
->cname
= 0;
550 qu
->answer
->owner
= 0;
551 adns__reset_preserved(qu
); /* (but we just threw away the preserved stuff) */
553 qu
->answer
->status
= adns_s_nomemory
;
554 free_query_allocs(qu
);
557 void adns__query_done(adns_query qu
) {
561 adns__cancel_children(qu
);
566 if (qu
->flags
& adns_qf_search
&& ans
->status
!= adns_s_nomemory
) {
567 if (!save_owner(qu
, qu
->search_vb
.buf
, qu
->search_vb
.used
)) {
568 adns__query_fail(qu
,adns_s_nomemory
);
573 if (ans
->nrrs
&& qu
->typei
->diff_needswap
) {
574 if (!adns__vbuf_ensure(&qu
->vb
,ans
->rrsz
)) {
575 adns__query_fail(qu
,adns_s_nomemory
);
578 adns__isort(ans
->rrs
.bytes
, ans
->nrrs
, ans
->rrsz
,
580 (int(*)(void*, const void*, const void*))
581 qu
->typei
->diff_needswap
,
584 if (ans
->nrrs
&& qu
->typei
->postsort
) {
585 qu
->typei
->postsort(qu
->ads
, ans
->rrs
.bytes
, ans
->nrrs
, qu
->typei
);
588 ans
->expires
= qu
->expires
;
591 LIST_UNLINK_PART(parent
->children
,qu
,siblings
.);
592 LIST_UNLINK(qu
->ads
->childw
,parent
);
593 qu
->ctx
.callback(parent
,qu
);
594 free_query_allocs(qu
);
599 LIST_LINK_TAIL(qu
->ads
->output
,qu
);
600 qu
->state
= query_done
;
604 void adns__query_fail(adns_query qu
, adns_status stat
) {
605 adns__reset_preserved(qu
);
606 qu
->answer
->status
= stat
;
607 adns__query_done(qu
);
610 void adns__makefinal_str(adns_query qu
, char **strp
) {
612 char *before
, *after
;
617 after
= adns__alloc_final(qu
,l
);
618 memcpy(after
,before
,l
);
622 void adns__makefinal_block(adns_query qu
, void **blpp
, size_t sz
) {
623 void *before
, *after
;
627 after
= adns__alloc_final(qu
,sz
);
628 memcpy(after
,before
,sz
);