e576be50 |
1 | /* |
2 | * query.c |
3 | * - overall query management (allocation, completion) |
4 | * - per-query memory management |
5 | * - query submission and cancellation (user-visible and internal) |
6 | */ |
7 | /* |
a719a4be |
8 | * This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson |
e576be50 |
9 | * |
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) |
13 | * any later version. |
14 | * |
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. |
19 | * |
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. |
23 | */ |
4353a5c4 |
24 | |
4bec51a4 |
25 | #include "internal.h" |
656b2da9 |
26 | |
e576be50 |
27 | #include <stdlib.h> |
28 | #include <unistd.h> |
29 | #include <errno.h> |
a6536d8b |
30 | #include <string.h> |
656b2da9 |
31 | |
e576be50 |
32 | #include <sys/time.h> |
656b2da9 |
33 | |
e576be50 |
34 | #include "internal.h" |
ddfda861 |
35 | |
e576be50 |
36 | int adns__internal_submit(adns_state ads, adns_query *query_r, |
3955725c |
37 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
e576be50 |
38 | adns_queryflags flags, struct timeval now, |
39 | adns_status failstat, const qcontext *ctx) { |
40 | adns_query qu; |
e576be50 |
41 | |
42 | qu= malloc(sizeof(*qu)); if (!qu) goto x_nomemory; |
43 | qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) goto x_freequ_nomemory; |
44 | |
3955725c |
45 | qu->ads= ads; |
e576be50 |
46 | qu->state= query_udp; |
47 | qu->back= qu->next= qu->parent= 0; |
48 | LIST_INIT(qu->children); |
49 | qu->siblings.next= qu->siblings.back= 0; |
551ff40f |
50 | LIST_INIT(qu->allocations); |
e576be50 |
51 | qu->interim_allocd= 0; |
3955725c |
52 | qu->final_allocspace= 0; |
e576be50 |
53 | |
3955725c |
54 | qu->typei= typei; |
e576be50 |
55 | adns__vbuf_init(&qu->vb); |
56 | |
57 | qu->cname_dgram= 0; |
58 | qu->cname_dglen= qu->cname_begin= 0; |
4bec51a4 |
59 | |
e576be50 |
60 | qu->id= id; |
61 | qu->flags= flags; |
62 | qu->udpretries= 0; |
63 | qu->udpnextserver= 0; |
64 | qu->udpsent= qu->tcpfailed= 0; |
65 | timerclear(&qu->timeout); |
a6536d8b |
66 | memcpy(&qu->ctx,ctx,sizeof(qu->ctx)); |
73dba56e |
67 | qu->expires= now.tv_sec + MAXTTLBELIEVE; |
e576be50 |
68 | |
69 | qu->answer->status= adns_s_ok; |
70 | qu->answer->cname= 0; |
3955725c |
71 | qu->answer->type= typei->type; |
e576be50 |
72 | qu->answer->nrrs= 0; |
73 | qu->answer->rrs= 0; |
3955725c |
74 | qu->answer->rrsz= typei->rrsz; |
e576be50 |
75 | |
76 | *query_r= qu; |
ddfda861 |
77 | |
a49a6d7b |
78 | qu->query_dglen= qumsg_vb->used; |
79 | if (qumsg_vb->used) { |
80 | qu->query_dgram= malloc(qumsg_vb->used); |
81 | if (!qu->query_dgram) { |
ea1e31e3 |
82 | adns__query_fail(qu,adns_s_nomemory); |
a49a6d7b |
83 | return adns_s_ok; |
84 | } |
85 | memcpy(qu->query_dgram,qumsg_vb->buf,qumsg_vb->used); |
86 | } else { |
87 | qu->query_dgram= 0; |
ddfda861 |
88 | } |
e576be50 |
89 | qu->vb= *qumsg_vb; |
90 | adns__vbuf_init(qumsg_vb); |
91 | |
92 | if (failstat) { |
3955725c |
93 | adns__query_fail(qu,failstat); |
94 | return adns_s_ok; |
656b2da9 |
95 | } |
3955725c |
96 | adns__query_udp(qu,now); |
e576be50 |
97 | adns__autosys(ads,now); |
98 | |
3955725c |
99 | return adns_s_ok; |
e576be50 |
100 | |
101 | x_freequ_nomemory: |
102 | free(qu); |
103 | x_nomemory: |
3955725c |
104 | adns__vbuf_free(qumsg_vb); |
ea1e31e3 |
105 | return adns_s_nomemory; |
4bec51a4 |
106 | } |
107 | |
e576be50 |
108 | int adns_submit(adns_state ads, |
109 | const char *owner, |
110 | adns_rrtype type, |
111 | adns_queryflags flags, |
112 | void *context, |
113 | adns_query *query_r) { |
114 | qcontext ctx; |
3955725c |
115 | int id, r, ol; |
e576be50 |
116 | vbuf vb; |
3955725c |
117 | adns_status stat; |
118 | const typeinfo *typei; |
119 | struct timeval now; |
e576be50 |
120 | |
3955725c |
121 | typei= adns__findtype(type); |
ea1e31e3 |
122 | if (!typei) return adns_s_unknownrrtype; |
3955725c |
123 | |
e576be50 |
124 | ctx.ext= context; |
a6536d8b |
125 | ctx.callback= 0; |
126 | memset(&ctx.info,0,sizeof(ctx.info)); |
127 | |
e576be50 |
128 | r= gettimeofday(&now,0); if (r) return errno; |
129 | id= 0; |
130 | |
131 | adns__vbuf_init(&vb); |
132 | |
133 | ol= strlen(owner); |
ea1e31e3 |
134 | if (ol<=1 || ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto xit; } |
e576be50 |
135 | |
136 | if (owner[ol-1]=='.' && owner[ol-2]!='\\') { flags &= ~adns_qf_search; ol--; } |
137 | |
3955725c |
138 | stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags); |
e576be50 |
139 | |
140 | xit: |
3955725c |
141 | return adns__internal_submit(ads,query_r, typei,&vb,id, flags,now, stat,&ctx); |
ddfda861 |
142 | } |
143 | |
e576be50 |
144 | int adns_synchronous(adns_state ads, |
145 | const char *owner, |
146 | adns_rrtype type, |
147 | adns_queryflags flags, |
148 | adns_answer **answer_r) { |
149 | adns_query qu; |
150 | int r; |
151 | |
152 | r= adns_submit(ads,owner,type,flags,0,&qu); |
153 | if (r) return r; |
4bec51a4 |
154 | |
88372443 |
155 | r= adns_wait(ads,&qu,answer_r,0); |
3955725c |
156 | if (r) adns_cancel(qu); |
ddfda861 |
157 | |
88372443 |
158 | return r; |
e576be50 |
159 | } |
160 | |
f759e52e |
161 | static void *alloc_common(adns_query qu, size_t sz) { |
e576be50 |
162 | allocnode *an; |
163 | |
a49a6d7b |
164 | if (!sz) return qu; /* Any old pointer will do */ |
e576be50 |
165 | assert(!qu->final_allocspace); |
e576be50 |
166 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
e062dcae |
167 | if (!an) return 0; |
551ff40f |
168 | LIST_LINK_TAIL(qu->allocations,an); |
e576be50 |
169 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
170 | } |
4bec51a4 |
171 | |
f759e52e |
172 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
173 | sz= MEM_ROUND(sz); |
174 | qu->interim_allocd += sz; |
175 | return alloc_common(qu,sz); |
176 | } |
177 | |
178 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
179 | return alloc_common(qu,MEM_ROUND(sz)); |
180 | } |
181 | |
551ff40f |
182 | void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) { |
183 | allocnode *an; |
184 | |
185 | if (!block) return; |
186 | an= (void*)((byte*)block - MEM_ROUND(sizeof(*an))); |
187 | |
188 | assert(!to->final_allocspace); |
189 | assert(!from->final_allocspace); |
190 | |
191 | LIST_UNLINK(from->allocations,an); |
192 | LIST_LINK_TAIL(to->allocations,an); |
193 | |
194 | from->interim_allocd -= sz; |
195 | to->interim_allocd += sz; |
73dba56e |
196 | |
197 | if (to->expires > from->expires) to->expires= from->expires; |
551ff40f |
198 | } |
199 | |
e576be50 |
200 | void *adns__alloc_final(adns_query qu, size_t sz) { |
201 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
202 | * each allocation, and use final_allocspace to point to the next free |
203 | * bit. |
204 | */ |
205 | void *rp; |
206 | |
207 | sz= MEM_ROUND(sz); |
208 | rp= qu->final_allocspace; |
209 | assert(rp); |
210 | qu->interim_allocd -= sz; |
211 | assert(qu->interim_allocd>=0); |
212 | qu->final_allocspace= (byte*)rp + sz; |
213 | return rp; |
214 | } |
215 | |
9ec44266 |
216 | static void cancel_children(adns_query qu) { |
217 | adns_query cqu, ncqu; |
218 | |
219 | for (cqu= qu->children.head; cqu; cqu= ncqu) { |
220 | ncqu= cqu->siblings.next; |
221 | adns_cancel(cqu); |
222 | } |
223 | LIST_INIT(qu->children); |
224 | } |
225 | |
3955725c |
226 | void adns__reset_cnameonly(adns_query qu) { |
9557e604 |
227 | assert(!qu->final_allocspace); |
9ec44266 |
228 | cancel_children(qu); |
e576be50 |
229 | qu->answer->nrrs= 0; |
230 | qu->answer->rrs= 0; |
231 | qu->interim_allocd= qu->answer->cname ? MEM_ROUND(strlen(qu->answer->cname)+1) : 0; |
4353a5c4 |
232 | } |
233 | |
88372443 |
234 | static void free_query_allocs(adns_query qu) { |
235 | allocnode *an, *ann; |
88372443 |
236 | |
9ec44266 |
237 | cancel_children(qu); |
551ff40f |
238 | for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); } |
88372443 |
239 | adns__vbuf_free(&qu->vb); |
240 | } |
241 | |
1dfe95d8 |
242 | void adns_cancel(adns_query qu) { |
88372443 |
243 | switch (qu->state) { |
244 | case query_udp: case query_tcpwait: case query_tcpsent: |
1dfe95d8 |
245 | LIST_UNLINK(qu->ads->timew,qu); |
88372443 |
246 | break; |
247 | case query_child: |
1dfe95d8 |
248 | LIST_UNLINK(qu->ads->childw,qu); |
88372443 |
249 | break; |
250 | case query_done: |
1dfe95d8 |
251 | LIST_UNLINK(qu->ads->output,qu); |
88372443 |
252 | break; |
253 | default: |
254 | abort(); |
255 | } |
256 | free_query_allocs(qu); |
257 | free(qu->answer); |
258 | free(qu); |
259 | } |
551ff40f |
260 | |
73dba56e |
261 | void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) { |
262 | time_t max; |
263 | |
264 | assert(ttl <= MAXTTLBELIEVE); |
265 | max= now.tv_sec + ttl; |
266 | if (qu->expires < max) return; |
267 | qu->expires= max; |
268 | } |
269 | |
551ff40f |
270 | static void makefinal_query(adns_query qu) { |
98a3f706 |
271 | adns_answer *ans; |
88372443 |
272 | int rrn; |
8e5b0abb |
273 | |
88372443 |
274 | ans= qu->answer; |
551ff40f |
275 | |
88372443 |
276 | if (qu->interim_allocd) { |
88372443 |
277 | ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd)); |
551ff40f |
278 | if (!ans) goto x_nomem; |
e062dcae |
279 | qu->answer= ans; |
280 | } |
8e5b0abb |
281 | |
88372443 |
282 | qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans)); |
8e5b0abb |
283 | adns__makefinal_str(qu,&ans->cname); |
88372443 |
284 | |
8e5b0abb |
285 | if (ans->nrrs) { |
88372443 |
286 | adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz); |
8e5b0abb |
287 | |
88372443 |
288 | for (rrn=0; rrn<ans->nrrs; rrn++) |
289 | qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz); |
88372443 |
290 | } |
73dba56e |
291 | |
88372443 |
292 | free_query_allocs(qu); |
551ff40f |
293 | return; |
8e5b0abb |
294 | |
551ff40f |
295 | x_nomem: |
ea1e31e3 |
296 | qu->answer->status= adns_s_nomemory; |
551ff40f |
297 | qu->answer->cname= 0; |
298 | adns__reset_cnameonly(qu); |
299 | free_query_allocs(qu); |
300 | } |
301 | |
302 | void adns__query_done(adns_query qu) { |
303 | adns_answer *ans; |
304 | adns_query parent; |
305 | |
4353a5c4 |
306 | qu->id= -1; |
551ff40f |
307 | ans= qu->answer; |
308 | |
309 | if (ans->nrrs && qu->typei->diff_needswap) { |
310 | if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) { |
ea1e31e3 |
311 | adns__query_fail(qu,adns_s_nomemory); |
551ff40f |
312 | return; |
313 | } |
314 | adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz, |
09957b1c |
315 | qu->vb.buf, |
316 | (int(*)(void*, const void*, const void*))qu->typei->diff_needswap, |
317 | qu->ads); |
551ff40f |
318 | } |
e553d072 |
319 | |
73dba56e |
320 | ans->expires= qu->expires; |
551ff40f |
321 | parent= qu->parent; |
322 | if (parent) { |
323 | LIST_UNLINK_PART(parent->children,qu,siblings.); |
a6536d8b |
324 | qu->ctx.callback(parent,qu); |
551ff40f |
325 | free_query_allocs(qu); |
326 | free(qu); |
551ff40f |
327 | } else { |
328 | makefinal_query(qu); |
329 | LIST_LINK_TAIL(qu->ads->output,qu); |
330 | } |
656b2da9 |
331 | } |
332 | |
3955725c |
333 | void adns__query_fail(adns_query qu, adns_status stat) { |
334 | adns__reset_cnameonly(qu); |
8e5b0abb |
335 | qu->answer->status= stat; |
3955725c |
336 | adns__query_done(qu); |
656b2da9 |
337 | } |
e576be50 |
338 | |
339 | void adns__makefinal_str(adns_query qu, char **strp) { |
340 | int l; |
341 | char *before, *after; |
342 | |
343 | before= *strp; |
9557e604 |
344 | if (!before) return; |
e576be50 |
345 | l= strlen(before)+1; |
346 | after= adns__alloc_final(qu,l); |
347 | memcpy(after,before,l); |
348 | *strp= after; |
349 | } |
350 | |
3955725c |
351 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
9557e604 |
352 | void *before, *after; |
e576be50 |
353 | |
9557e604 |
354 | before= *blpp; |
355 | if (!before) return; |
e576be50 |
356 | after= adns__alloc_final(qu,sz); |
9557e604 |
357 | memcpy(after,before,sz); |
e576be50 |
358 | *blpp= after; |
359 | } |