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 adns__query_fail(qu,adns_s_nolocalmem);
171 an->next= qu->allocations;
173 return (byte*)an + MEM_ROUND(sizeof(*an));
176 void *adns__alloc_interim(adns_query qu, size_t sz) {
178 qu->interim_allocd += sz;
179 return alloc_common(qu,sz);
182 void *adns__alloc_mine(adns_query qu, size_t sz) {
183 return alloc_common(qu,MEM_ROUND(sz));
186 void *adns__alloc_final(adns_query qu, size_t sz) {
187 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
188 * each allocation, and use final_allocspace to point to the next free
194 rp= qu->final_allocspace;
196 qu->interim_allocd -= sz;
197 assert(qu->interim_allocd>=0);
198 qu->final_allocspace= (byte*)rp + sz;
202 void adns__reset_cnameonly(adns_query qu) {
203 assert(!qu->final_allocspace);
206 qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0;
209 void adns__query_done(adns_query qu) {
214 qu->answer= ans= realloc(qu->answer,
215 MEM_ROUND(MEM_ROUND(sizeof(*ans)) +
216 qu->interim_allocd));
217 qu->final_allocspace= (byte*)qu->answer + MEM_ROUND(sizeof(*ans));
219 adns__makefinal_str(qu,&ans->cname);
221 adns__makefinal_block(qu,&ans->rrs.untyped,ans->rrsz*ans->nrrs);
222 for (i=0; i<ans->nrrs; i++)
223 qu->typei->makefinal(qu,ans->rrs.bytes+ans->rrsz*i);
226 for (an= qu->allocations; an; an= ann) { ann= an->next; free(an); }
228 adns__vbuf_free(&qu->vb);
231 LIST_LINK_TAIL(qu->ads->output,qu);
234 void adns__query_fail(adns_query qu, adns_status stat) {
235 adns__reset_cnameonly(qu);
236 qu->answer->status= stat;
237 adns__query_done(qu);
240 void adns__makefinal_str(adns_query qu, char **strp) {
242 char *before, *after;
247 after= adns__alloc_final(qu,l);
248 memcpy(after,before,l);
252 void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
253 void *before, *after;
257 after= adns__alloc_final(qu,sz);
258 memcpy(after,before,sz);