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) 1997-1999 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.
36 int adns__internal_submit(adns_state ads, adns_query *query_r,
37 const typeinfo *typei, vbuf *qumsg_vb, int id,
38 adns_queryflags flags, struct timeval now,
39 adns_status failstat, const qcontext *ctx) {
42 qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory;
43 qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory;
47 qu->back= qu->next= qu->parent= 0;
48 LIST_INIT(qu->children);
49 qu->siblings.next= qu->siblings.back= 0;
50 LIST_INIT(qu->allocations);
51 qu->interim_allocd= 0;
52 qu->final_allocspace= 0;
55 adns__vbuf_init(&qu->vb);
58 qu->cname_dglen= qu->cname_begin= 0;
64 qu->udpsent= qu->tcpfailed= 0;
65 timerclear(&qu->timeout);
66 memcpy(&qu->ctx,ctx,sizeof(qu->ctx));
68 qu->answer->status= adns_s_ok;
70 qu->answer->type= typei->type;
73 qu->answer->rrsz= typei->rrsz;
77 qu->query_dglen= qumsg_vb->used;
79 qu->query_dgram= malloc(qumsg_vb->used);
80 if (!qu->query_dgram) {
81 adns__query_fail(qu,adns_s_nomemory);
84 memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used);
89 adns__vbuf_init(qumsg_vb);
92 adns__query_fail(qu,failstat);
95 adns__query_udp(qu,now);
96 adns__autosys(ads,now);
103 adns__vbuf_free(qumsg_vb);
104 return adns_s_nomemory;
107 int adns_submit(adns_state ads,
110 adns_queryflags flags,
112 adns_query *query_r) {
117 const typeinfo *typei;
120 typei= adns__findtype(type);
121 if (!typei) return adns_s_unknownrrtype;
125 memset(&ctx.info,0,sizeof(ctx.info));
127 r= gettimeofday(&now,0); if (r) return errno;
130 adns__vbuf_init(&vb);
133 if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto xit; }
135 if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; }
137 stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags);
140 return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx);
143 int adns_synchronous(adns_state ads,
146 adns_queryflags flags,
147 adns_answer **answer_r) {
151 r= adns_submit(ads,owner,type,flags,0,&qu);
154 r= adns_wait(ads,&qu,answer_r,0);
155 if (r) adns_cancel(qu);
160 static void *alloc_common(adns_query qu, size_t sz) {
163 if (!sz) return qu; /* Any old pointer will do */
164 assert(!qu->final_allocspace);
165 an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz));
167 LIST_LINK_TAIL(qu->allocations,an);
168 return (byte*)an + MEM_ROUND(sizeof(*an));
171 void *adns__alloc_interim(adns_query qu, size_t sz) {
173 qu->interim_allocd += sz;
174 return alloc_common(qu,sz);
177 void *adns__alloc_mine(adns_query qu, size_t sz) {
178 return alloc_common(qu,MEM_ROUND(sz));
181 void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) {
185 an= (void*)((byte*)block - MEM_ROUND(sizeof(*an)));
187 assert(!to->final_allocspace);
188 assert(!from->final_allocspace);
190 LIST_UNLINK(from->allocations,an);
191 LIST_LINK_TAIL(to->allocations,an);
193 from->interim_allocd -= sz;
194 to->interim_allocd += sz;
197 void *adns__alloc_final(adns_query qu, size_t sz) {
198 /* When we're in the _final stage, we _subtract_ from interim_alloc'd
199 * each allocation, and use final_allocspace to point to the next free
205 rp= qu->final_allocspace;
207 qu->interim_allocd -= sz;
208 assert(qu->interim_allocd>=0);
209 qu->final_allocspace= (byte*)rp + sz;
213 static void cancel_children(adns_query qu) {
214 adns_query cqu, ncqu;
216 for (cqu= qu->children.head; cqu; cqu= ncqu) {
217 ncqu= cqu->siblings.next;
220 LIST_INIT(qu->children);
223 void adns__reset_cnameonly(adns_query qu) {
224 assert(!qu->final_allocspace);
228 qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0;
231 static void free_query_allocs(adns_query qu) {
235 for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); }
236 adns__vbuf_free(&qu->vb);
239 void adns_cancel(adns_query qu) {
241 case query_udp: case query_tcpwait: case query_tcpsent:
242 LIST_UNLINK(qu->ads->timew,qu);
245 LIST_UNLINK(qu->ads->childw,qu);
248 LIST_UNLINK(qu->ads->output,qu);
253 free_query_allocs(qu);
258 static void makefinal_query(adns_query qu) {
264 if (qu->interim_allocd) {
265 ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd));
266 if (!ans) goto x_nomem;
270 qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans));
271 adns__makefinal_str(qu,&ans->cname);
274 adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz);
276 for (rrn=0; rrn<ans->nrrs; rrn++)
277 qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz);
280 free_query_allocs(qu);
284 qu->answer->status= adns_s_nomemory;
285 qu->answer->cname= 0;
286 adns__reset_cnameonly(qu);
287 free_query_allocs(qu);
290 void adns__query_done(adns_query qu) {
297 if (ans->nrrs && qu->typei->diff_needswap) {
298 if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) {
299 adns__query_fail(qu,adns_s_nomemory);
302 adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz,
304 (int(*)(void*, const void*, const void*))qu->typei->diff_needswap,
310 LIST_UNLINK_PART(parent->children,qu,siblings.);
311 qu->ctx.callback(parent,qu);
312 free_query_allocs(qu);
316 LIST_LINK_TAIL(qu->ads->output,qu);
320 void adns__query_fail(adns_query qu, adns_status stat) {
321 adns__reset_cnameonly(qu);
322 qu->answer->status= stat;
323 adns__query_done(qu);
326 void adns__makefinal_str(adns_query qu, char **strp) {
328 char *before, *after;
333 after= adns__alloc_final(qu,l);
334 memcpy(after,before,l);
338 void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) {
339 void *before, *after;
343 after= adns__alloc_final(qu,sz);
344 memcpy(after,before,sz);