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 Copyright (C) 1997, 1998 Ian Jackson
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2, or (at your option)
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
35 int adns__internal_submit(adns_state ads
, adns_query
*query_r
,
36 const typeinfo
*typei
, vbuf
*qumsg_vb
, int id
,
37 adns_queryflags flags
, struct timeval now
,
38 adns_status failstat
, const qcontext
*ctx
) {
41 qu
= malloc(sizeof(*qu
)); if (!qu
) goto x_nomemory
;
42 qu
->answer
= malloc(sizeof(*qu
->answer
)); if (!qu
->answer
) goto x_freequ_nomemory
;
46 qu
->back
= qu
->next
= qu
->parent
= 0;
47 LIST_INIT(qu
->children
);
48 qu
->siblings
.next
= qu
->siblings
.back
= 0;
50 qu
->interim_allocd
= 0;
51 qu
->final_allocspace
= 0;
54 adns__vbuf_init(&qu
->vb
);
57 qu
->cname_dglen
= qu
->cname_begin
= 0;
63 qu
->udpsent
= qu
->tcpfailed
= 0;
64 timerclear(&qu
->timeout
);
65 memcpy(&qu
->context
,ctx
,sizeof(qu
->context
));
67 qu
->answer
->status
= adns_s_ok
;
69 qu
->answer
->type
= typei
->type
;
72 qu
->answer
->rrsz
= typei
->rrsz
;
76 qu
->query_dglen
= qumsg_vb
->used
;
78 qu
->query_dgram
= malloc(qumsg_vb
->used
);
79 if (!qu
->query_dgram
) {
80 adns__query_fail(qu
,adns_s_nolocalmem
);
83 memcpy(qu
->query_dgram
,qumsg_vb
->buf
,qumsg_vb
->used
);
88 adns__vbuf_init(qumsg_vb
);
91 adns__query_fail(qu
,failstat
);
94 adns__query_udp(qu
,now
);
95 adns__autosys(ads
,now
);
102 adns__vbuf_free(qumsg_vb
);
103 return adns_s_nolocalmem
;
106 int adns_submit(adns_state ads
,
109 adns_queryflags flags
,
111 adns_query
*query_r
) {
116 const typeinfo
*typei
;
119 typei
= adns__findtype(type
);
120 if (!typei
) return adns_s_notimplemented
;
123 r
= gettimeofday(&now
,0); if (r
) return errno
;
126 adns__vbuf_init(&vb
);
129 if (ol
<=1 || ol
>DNS_MAXDOMAIN
+1) { stat
= adns_s_domaintoolong
; goto xit
; }
131 if (owner
[ol
-1]=='.' && owner
[ol
-2]!='\\') { flags
&= ~adns_qf_search
; ol
--; }
133 stat
= adns__mkquery(ads
,&vb
,&id
, owner
,ol
, typei
,flags
);
136 return adns__internal_submit(ads
,query_r
, typei
,&vb
,id
, flags
,now
, stat
,&ctx
);
139 int adns_synchronous(adns_state ads
,
142 adns_queryflags flags
,
143 adns_answer
**answer_r
) {
147 r
= adns_submit(ads
,owner
,type
,flags
,0,&qu
);
151 r
= adns_wait(ads
,&qu
,answer_r
,0);
153 if (r
) adns_cancel(qu
);
157 void adns_cancel(adns_query query
) {
161 static void *alloc_common(adns_query qu
, size_t sz
) {
164 if (!sz
) return qu
; /* Any old pointer will do */
165 assert(!qu
->final_allocspace
);
166 an
= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an
)) + sz
));
168 an
->next
= qu
->allocations
;
170 return (byte
*)an
+ MEM_ROUND(sizeof(*an
));
173 void *adns__alloc_interim(adns_query qu
, size_t sz
) {
175 qu
->interim_allocd
+= sz
;
176 return alloc_common(qu
,sz
);
179 void *adns__alloc_mine(adns_query qu
, size_t sz
) {
180 return alloc_common(qu
,MEM_ROUND(sz
));
183 void *adns__alloc_final(adns_query qu
, size_t sz
) {
184 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
185 * each allocation, and use final_allocspace to point to the next free
191 rp
= qu
->final_allocspace
;
193 qu
->interim_allocd
-= sz
;
194 assert(qu
->interim_allocd
>=0);
195 qu
->final_allocspace
= (byte
*)rp
+ sz
;
199 void adns__reset_cnameonly(adns_query qu
) {
200 assert(!qu
->final_allocspace
);
203 qu
->interim_allocd
= qu
->answer
->cname ?
MEM_ROUND(strlen(qu
->answer
->cname
)+1) : 0;
206 void adns__query_done(adns_query qu
) {
211 if (qu
->answer
->status
== adns_s_nolocalmem
&& !qu
->interim_allocd
) {
214 ans
= realloc(qu
->answer
,
215 MEM_ROUND(MEM_ROUND(sizeof(*ans
)) + qu
->interim_allocd
));
217 qu
->answer
->cname
= 0;
218 adns__query_fail(qu
, adns_s_nolocalmem
);
223 qu
->final_allocspace
= (byte
*)ans
+ MEM_ROUND(sizeof(*ans
));
225 adns__makefinal_str(qu
,&ans
->cname
);
227 adns__makefinal_block(qu
,&ans
->rrs
.untyped
,ans
->rrsz
*ans
->nrrs
);
228 for (i
=0; i
<ans
->nrrs
; i
++)
229 qu
->typei
->makefinal(qu
,ans
->rrs
.bytes
+ans
->rrsz
*i
);
232 for (an
= qu
->allocations
; an
; an
= ann
) { ann
= an
->next
; free(an
); }
234 adns__vbuf_free(&qu
->vb
);
237 LIST_LINK_TAIL(qu
->ads
->output
,qu
);
240 void adns__query_fail(adns_query qu
, adns_status stat
) {
241 adns__reset_cnameonly(qu
);
242 qu
->answer
->status
= stat
;
243 adns__query_done(qu
);
246 void adns__makefinal_str(adns_query qu
, char **strp
) {
248 char *before
, *after
;
253 after
= adns__alloc_final(qu
,l
);
254 memcpy(after
,before
,l
);
258 void adns__makefinal_block(adns_query qu
, void **blpp
, size_t sz
) {
259 void *before
, *after
;
263 after
= adns__alloc_final(qu
,sz
);
264 memcpy(after
,before
,sz
);