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 | /* |
d942707d |
8 | * This file is |
9 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
10 | * |
11 | * It is part of adns, which is |
12 | * Copyright (C) 1997-1999 Ian Jackson <ian@davenant.greenend.org.uk> |
13 | * Copyright (C) 1999 Tony Finch <dot@dotat.at> |
e576be50 |
14 | * |
15 | * This program is free software; you can redistribute it and/or modify |
16 | * it under the terms of the GNU General Public License as published by |
17 | * the Free Software Foundation; either version 2, or (at your option) |
18 | * any later version. |
19 | * |
20 | * This program is distributed in the hope that it will be useful, |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
23 | * GNU General Public License for more details. |
24 | * |
25 | * You should have received a copy of the GNU General Public License |
26 | * along with this program; if not, write to the Free Software Foundation, |
27 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
28 | */ |
4353a5c4 |
29 | |
4bec51a4 |
30 | #include "internal.h" |
656b2da9 |
31 | |
e576be50 |
32 | #include <stdlib.h> |
33 | #include <unistd.h> |
34 | #include <errno.h> |
656b2da9 |
35 | |
e576be50 |
36 | #include <sys/time.h> |
656b2da9 |
37 | |
e576be50 |
38 | #include "internal.h" |
ddfda861 |
39 | |
660d7d3b |
40 | static adns_query query_alloc(adns_state ads, const typeinfo *typei, |
41 | adns_queryflags flags, struct timeval now) { |
42 | /* Allocate a virgin query and return it. */ |
e576be50 |
43 | adns_query qu; |
660d7d3b |
44 | |
45 | qu= malloc(sizeof(*qu)); if (!qu) return 0; |
46 | qu->answer= malloc(sizeof(*qu->answer)); if (!qu->answer) { free(qu); return 0; } |
47 | |
3955725c |
48 | qu->ads= ads; |
d8c062fa |
49 | qu->state= query_tosend; |
e576be50 |
50 | qu->back= qu->next= qu->parent= 0; |
51 | LIST_INIT(qu->children); |
660d7d3b |
52 | LINK_INIT(qu->siblings); |
551ff40f |
53 | LIST_INIT(qu->allocations); |
e576be50 |
54 | qu->interim_allocd= 0; |
8b3d55e3 |
55 | qu->preserved_allocd= 0; |
3955725c |
56 | qu->final_allocspace= 0; |
e576be50 |
57 | |
3955725c |
58 | qu->typei= typei; |
660d7d3b |
59 | qu->query_dgram= 0; |
60 | qu->query_dglen= 0; |
e576be50 |
61 | adns__vbuf_init(&qu->vb); |
62 | |
63 | qu->cname_dgram= 0; |
64 | qu->cname_dglen= qu->cname_begin= 0; |
660d7d3b |
65 | |
66 | adns__vbuf_init(&qu->search_vb); |
67 | qu->search_origlen= qu->search_pos= qu->search_doneabs= 0; |
68 | |
69 | qu->id= 0; |
e576be50 |
70 | qu->flags= flags; |
71 | qu->udpretries= 0; |
72 | qu->udpnextserver= 0; |
73 | qu->udpsent= qu->tcpfailed= 0; |
74 | timerclear(&qu->timeout); |
73dba56e |
75 | qu->expires= now.tv_sec + MAXTTLBELIEVE; |
e576be50 |
76 | |
660d7d3b |
77 | memset(&qu->ctx,0,sizeof(qu->ctx)); |
78 | |
e576be50 |
79 | qu->answer->status= adns_s_ok; |
22181a31 |
80 | qu->answer->cname= qu->answer->owner= 0; |
3955725c |
81 | qu->answer->type= typei->type; |
660d7d3b |
82 | qu->answer->expires= -1; |
e576be50 |
83 | qu->answer->nrrs= 0; |
71a6ff46 |
84 | qu->answer->rrs.untyped= 0; |
3955725c |
85 | qu->answer->rrsz= typei->rrsz; |
ddfda861 |
86 | |
660d7d3b |
87 | return qu; |
88 | } |
89 | |
90 | static void query_submit(adns_state ads, adns_query qu, |
91 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
92 | adns_queryflags flags, struct timeval now) { |
93 | /* Fills in the query message in for a previously-allocated query, |
94 | * and submits it. Cannot fail. |
95 | */ |
96 | |
e576be50 |
97 | qu->vb= *qumsg_vb; |
98 | adns__vbuf_init(qumsg_vb); |
660d7d3b |
99 | |
100 | qu->query_dgram= malloc(qu->vb.used); |
101 | if (!qu->query_dgram) { adns__query_fail(qu,adns_s_nomemory); return; } |
102 | |
103 | qu->id= id; |
104 | qu->query_dglen= qu->vb.used; |
105 | memcpy(qu->query_dgram,qu->vb.buf,qu->vb.used); |
e576be50 |
106 | |
d8c062fa |
107 | adns__query_send(qu,now); |
660d7d3b |
108 | } |
109 | |
110 | adns_status adns__internal_submit(adns_state ads, adns_query *query_r, |
111 | const typeinfo *typei, vbuf *qumsg_vb, int id, |
112 | adns_queryflags flags, struct timeval now, |
113 | const qcontext *ctx) { |
114 | adns_query qu; |
115 | |
116 | qu= query_alloc(ads,typei,flags,now); |
117 | if (!qu) { adns__vbuf_free(qumsg_vb); return adns_s_nomemory; } |
118 | *query_r= qu; |
e576be50 |
119 | |
660d7d3b |
120 | memcpy(&qu->ctx,ctx,sizeof(qu->ctx)); |
121 | query_submit(ads,qu, typei,qumsg_vb,id,flags,now); |
122 | |
3955725c |
123 | return adns_s_ok; |
660d7d3b |
124 | } |
125 | |
126 | static void query_simple(adns_state ads, adns_query qu, |
127 | const char *owner, int ol, |
128 | const typeinfo *typei, adns_queryflags flags, |
129 | struct timeval now) { |
130 | vbuf vb; |
131 | int id; |
132 | adns_status stat; |
e576be50 |
133 | |
660d7d3b |
134 | adns__vbuf_init(&vb); |
135 | |
136 | stat= adns__mkquery(ads,&vb,&id, owner,ol, typei,flags); |
137 | if (stat) { adns__query_fail(qu,stat); return; } |
138 | |
139 | query_submit(ads,qu, typei,&vb,id, flags,now); |
140 | } |
141 | |
142 | void adns__search_next(adns_state ads, adns_query qu, struct timeval now) { |
143 | const char *nextentry; |
144 | adns_status stat; |
145 | |
146 | if (qu->search_doneabs<0) { |
147 | nextentry= 0; |
148 | qu->search_doneabs= 1; |
149 | } else { |
150 | if (qu->search_pos >= ads->nsearchlist) { |
151 | if (qu->search_doneabs) { |
152 | stat= adns_s_nxdomain; goto x_fail; |
153 | return; |
154 | } else { |
155 | nextentry= 0; |
156 | qu->search_doneabs= 1; |
157 | } |
158 | } else { |
159 | nextentry= ads->searchlist[qu->search_pos++]; |
160 | } |
161 | } |
162 | |
e2632eb9 |
163 | qu->search_vb.used= qu->search_origlen; |
660d7d3b |
164 | if (nextentry) { |
165 | if (!adns__vbuf_append(&qu->search_vb,".",1) || |
166 | !adns__vbuf_appendstr(&qu->search_vb,nextentry)) { |
167 | stat= adns_s_nomemory; goto x_fail; |
660d7d3b |
168 | } |
169 | } |
170 | |
171 | free(qu->query_dgram); |
172 | qu->query_dgram= 0; qu->query_dglen= 0; |
173 | |
174 | query_simple(ads,qu, qu->search_vb.buf, qu->search_vb.used, qu->typei, qu->flags, now); |
175 | return; |
176 | |
177 | x_fail: |
178 | adns__query_fail(qu,stat); |
4bec51a4 |
179 | } |
180 | |
22181a31 |
181 | static int save_owner(adns_query qu, const char *owner, int ol) { |
182 | /* Returns 1 if OK, otherwise there was no memory. */ |
183 | adns_answer *ans; |
184 | |
185 | ans= qu->answer; |
186 | assert(!ans->owner); |
187 | |
8b3d55e3 |
188 | ans->owner= adns__alloc_preserved(qu,ol+1); if (!ans->owner) return 0; |
22181a31 |
189 | |
190 | memcpy(ans->owner,owner,ol); |
191 | ans->owner[ol]= 0; |
192 | return 1; |
193 | } |
194 | |
e576be50 |
195 | int adns_submit(adns_state ads, |
196 | const char *owner, |
197 | adns_rrtype type, |
679ff49d |
198 | int flags, |
e576be50 |
199 | void *context, |
200 | adns_query *query_r) { |
660d7d3b |
201 | int r, ol, ndots; |
3955725c |
202 | adns_status stat; |
203 | const typeinfo *typei; |
204 | struct timeval now; |
660d7d3b |
205 | adns_query qu; |
206 | const char *p; |
e576be50 |
207 | |
28de6442 |
208 | adns__consistency(ads,0,cc_entex); |
3e2e5fab |
209 | |
3955725c |
210 | typei= adns__findtype(type); |
636b69b1 |
211 | if (!typei) return ENOSYS; |
e576be50 |
212 | |
660d7d3b |
213 | r= gettimeofday(&now,0); if (r) goto x_errno; |
214 | qu= query_alloc(ads,typei,flags,now); if (!qu) goto x_errno; |
215 | |
216 | qu->ctx.ext= context; |
217 | qu->ctx.callback= 0; |
218 | memset(&qu->ctx.info,0,sizeof(qu->ctx.info)); |
e576be50 |
219 | |
e2632eb9 |
220 | *query_r= qu; |
221 | |
e576be50 |
222 | ol= strlen(owner); |
660d7d3b |
223 | if (!ol) { stat= adns_s_querydomaininvalid; goto x_adnsfail; } |
224 | if (ol>DNS_MAXDOMAIN+1) { stat= adns_s_querydomaintoolong; goto x_adnsfail; } |
e576be50 |
225 | |
e9e53c73 |
226 | if (ol>=1 && owner[ol-1]=='.' && (ol<2 || owner[ol-2]!='\\')) { |
227 | flags &= ~adns_qf_search; |
3d1ae6ea |
228 | qu->flags= flags; |
e9e53c73 |
229 | ol--; |
230 | } |
e576be50 |
231 | |
660d7d3b |
232 | if (flags & adns_qf_search) { |
233 | r= adns__vbuf_append(&qu->search_vb,owner,ol); |
234 | if (!r) { stat= adns_s_nomemory; goto x_adnsfail; } |
235 | |
236 | for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++); |
237 | qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0; |
660d7d3b |
238 | qu->search_origlen= ol; |
660d7d3b |
239 | adns__search_next(ads,qu,now); |
e2632eb9 |
240 | } else { |
22181a31 |
241 | if (flags & adns_qf_owner) { |
242 | if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; } |
243 | } |
e2632eb9 |
244 | query_simple(ads,qu, owner,ol, typei,flags, now); |
660d7d3b |
245 | } |
70ad7a2a |
246 | adns__autosys(ads,now); |
28de6442 |
247 | adns__consistency(ads,qu,cc_entex); |
660d7d3b |
248 | return 0; |
249 | |
250 | x_adnsfail: |
251 | adns__query_fail(qu,stat); |
28de6442 |
252 | adns__consistency(ads,qu,cc_entex); |
660d7d3b |
253 | return 0; |
254 | |
255 | x_errno: |
256 | r= errno; |
257 | assert(r); |
28de6442 |
258 | adns__consistency(ads,0,cc_entex); |
660d7d3b |
259 | return r; |
ddfda861 |
260 | } |
261 | |
d7449548 |
262 | int adns_submit_reverse(adns_state ads, |
263 | const struct sockaddr *addr, |
264 | adns_rrtype type, |
679ff49d |
265 | int flags, |
d7449548 |
266 | void *context, |
267 | adns_query *query_r) { |
268 | const unsigned char *iaddr; |
269 | char buf[30]; |
270 | |
271 | if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL; |
272 | flags &= ~adns_qf_search; |
273 | |
274 | if (addr->sa_family != AF_INET) return ENOSYS; |
275 | iaddr= (const unsigned char*) &(((const struct sockaddr_in*)addr) -> sin_addr); |
276 | |
277 | sprintf(buf, "%d.%d.%d.%d.in-addr.arpa", |
278 | iaddr[3], iaddr[2], iaddr[1], iaddr[0]); |
279 | |
280 | return adns_submit(ads,buf,type,flags,context,query_r); |
281 | } |
282 | |
e576be50 |
283 | int adns_synchronous(adns_state ads, |
284 | const char *owner, |
285 | adns_rrtype type, |
679ff49d |
286 | int flags, |
e576be50 |
287 | adns_answer **answer_r) { |
288 | adns_query qu; |
289 | int r; |
290 | |
291 | r= adns_submit(ads,owner,type,flags,0,&qu); |
292 | if (r) return r; |
4bec51a4 |
293 | |
88372443 |
294 | r= adns_wait(ads,&qu,answer_r,0); |
3955725c |
295 | if (r) adns_cancel(qu); |
ddfda861 |
296 | |
88372443 |
297 | return r; |
e576be50 |
298 | } |
299 | |
f759e52e |
300 | static void *alloc_common(adns_query qu, size_t sz) { |
e576be50 |
301 | allocnode *an; |
302 | |
a49a6d7b |
303 | if (!sz) return qu; /* Any old pointer will do */ |
e576be50 |
304 | assert(!qu->final_allocspace); |
e576be50 |
305 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
e062dcae |
306 | if (!an) return 0; |
551ff40f |
307 | LIST_LINK_TAIL(qu->allocations,an); |
e576be50 |
308 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
309 | } |
4bec51a4 |
310 | |
f759e52e |
311 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
8b3d55e3 |
312 | void *rv; |
313 | |
f759e52e |
314 | sz= MEM_ROUND(sz); |
8b3d55e3 |
315 | rv= alloc_common(qu,sz); |
316 | if (!rv) return 0; |
f759e52e |
317 | qu->interim_allocd += sz; |
8b3d55e3 |
318 | return rv; |
319 | } |
320 | |
321 | void *adns__alloc_preserved(adns_query qu, size_t sz) { |
322 | void *rv; |
323 | |
324 | sz= MEM_ROUND(sz); |
325 | rv= adns__alloc_interim(qu,sz); |
326 | if (!rv) return 0; |
327 | qu->preserved_allocd += sz; |
328 | return rv; |
f759e52e |
329 | } |
330 | |
331 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
332 | return alloc_common(qu,MEM_ROUND(sz)); |
333 | } |
334 | |
551ff40f |
335 | void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) { |
336 | allocnode *an; |
337 | |
338 | if (!block) return; |
339 | an= (void*)((byte*)block - MEM_ROUND(sizeof(*an))); |
340 | |
341 | assert(!to->final_allocspace); |
342 | assert(!from->final_allocspace); |
343 | |
344 | LIST_UNLINK(from->allocations,an); |
345 | LIST_LINK_TAIL(to->allocations,an); |
346 | |
347 | from->interim_allocd -= sz; |
348 | to->interim_allocd += sz; |
73dba56e |
349 | |
350 | if (to->expires > from->expires) to->expires= from->expires; |
551ff40f |
351 | } |
352 | |
e576be50 |
353 | void *adns__alloc_final(adns_query qu, size_t sz) { |
354 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
355 | * each allocation, and use final_allocspace to point to the next free |
356 | * bit. |
357 | */ |
358 | void *rp; |
359 | |
360 | sz= MEM_ROUND(sz); |
361 | rp= qu->final_allocspace; |
362 | assert(rp); |
363 | qu->interim_allocd -= sz; |
364 | assert(qu->interim_allocd>=0); |
365 | qu->final_allocspace= (byte*)rp + sz; |
366 | return rp; |
367 | } |
368 | |
9ec44266 |
369 | static void cancel_children(adns_query qu) { |
370 | adns_query cqu, ncqu; |
371 | |
372 | for (cqu= qu->children.head; cqu; cqu= ncqu) { |
373 | ncqu= cqu->siblings.next; |
374 | adns_cancel(cqu); |
375 | } |
9ec44266 |
376 | } |
377 | |
8b3d55e3 |
378 | void adns__reset_preserved(adns_query qu) { |
9557e604 |
379 | assert(!qu->final_allocspace); |
9ec44266 |
380 | cancel_children(qu); |
e576be50 |
381 | qu->answer->nrrs= 0; |
71a6ff46 |
382 | qu->answer->rrs.untyped= 0; |
8b3d55e3 |
383 | qu->interim_allocd= qu->preserved_allocd; |
4353a5c4 |
384 | } |
385 | |
88372443 |
386 | static void free_query_allocs(adns_query qu) { |
387 | allocnode *an, *ann; |
88372443 |
388 | |
9ec44266 |
389 | cancel_children(qu); |
551ff40f |
390 | for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); } |
bfc2c80e |
391 | LIST_INIT(qu->allocations); |
88372443 |
392 | adns__vbuf_free(&qu->vb); |
393 | } |
394 | |
1dfe95d8 |
395 | void adns_cancel(adns_query qu) { |
3e2e5fab |
396 | adns_state ads; |
397 | |
398 | ads= qu->ads; |
28de6442 |
399 | adns__consistency(ads,qu,cc_entex); |
33ae0ddd |
400 | if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.); |
88372443 |
401 | switch (qu->state) { |
d8c062fa |
402 | case query_tosend: case query_tcpwait: case query_tcpsent: |
3e2e5fab |
403 | LIST_UNLINK(ads->timew,qu); |
88372443 |
404 | break; |
405 | case query_child: |
3e2e5fab |
406 | LIST_UNLINK(ads->childw,qu); |
88372443 |
407 | break; |
408 | case query_done: |
3e2e5fab |
409 | LIST_UNLINK(ads->output,qu); |
88372443 |
410 | break; |
411 | default: |
412 | abort(); |
413 | } |
414 | free_query_allocs(qu); |
415 | free(qu->answer); |
416 | free(qu); |
28de6442 |
417 | adns__consistency(ads,0,cc_entex); |
88372443 |
418 | } |
551ff40f |
419 | |
73dba56e |
420 | void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) { |
421 | time_t max; |
422 | |
423 | assert(ttl <= MAXTTLBELIEVE); |
424 | max= now.tv_sec + ttl; |
425 | if (qu->expires < max) return; |
426 | qu->expires= max; |
427 | } |
428 | |
551ff40f |
429 | static void makefinal_query(adns_query qu) { |
98a3f706 |
430 | adns_answer *ans; |
88372443 |
431 | int rrn; |
8e5b0abb |
432 | |
88372443 |
433 | ans= qu->answer; |
551ff40f |
434 | |
88372443 |
435 | if (qu->interim_allocd) { |
88372443 |
436 | ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd)); |
551ff40f |
437 | if (!ans) goto x_nomem; |
e062dcae |
438 | qu->answer= ans; |
439 | } |
8e5b0abb |
440 | |
88372443 |
441 | qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans)); |
8e5b0abb |
442 | adns__makefinal_str(qu,&ans->cname); |
22181a31 |
443 | adns__makefinal_str(qu,&ans->owner); |
88372443 |
444 | |
8e5b0abb |
445 | if (ans->nrrs) { |
88372443 |
446 | adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz); |
8e5b0abb |
447 | |
88372443 |
448 | for (rrn=0; rrn<ans->nrrs; rrn++) |
449 | qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz); |
88372443 |
450 | } |
73dba56e |
451 | |
88372443 |
452 | free_query_allocs(qu); |
551ff40f |
453 | return; |
8e5b0abb |
454 | |
551ff40f |
455 | x_nomem: |
8b3d55e3 |
456 | qu->preserved_allocd= 0; |
551ff40f |
457 | qu->answer->cname= 0; |
8b3d55e3 |
458 | qu->answer->owner= 0; |
459 | adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */ |
460 | |
461 | qu->answer->status= adns_s_nomemory; |
551ff40f |
462 | free_query_allocs(qu); |
463 | } |
464 | |
465 | void adns__query_done(adns_query qu) { |
466 | adns_answer *ans; |
467 | adns_query parent; |
468 | |
4218fb9a |
469 | cancel_children(qu); |
470 | |
4353a5c4 |
471 | qu->id= -1; |
551ff40f |
472 | ans= qu->answer; |
473 | |
22181a31 |
474 | if (qu->flags & adns_qf_owner && qu->flags & adns_qf_search && |
475 | ans->status != adns_s_nomemory) { |
476 | if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) { |
477 | adns__query_fail(qu,adns_s_nomemory); |
478 | return; |
479 | } |
480 | } |
481 | |
551ff40f |
482 | if (ans->nrrs && qu->typei->diff_needswap) { |
483 | if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) { |
ea1e31e3 |
484 | adns__query_fail(qu,adns_s_nomemory); |
551ff40f |
485 | return; |
486 | } |
487 | adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz, |
09957b1c |
488 | qu->vb.buf, |
489 | (int(*)(void*, const void*, const void*))qu->typei->diff_needswap, |
490 | qu->ads); |
551ff40f |
491 | } |
e553d072 |
492 | |
73dba56e |
493 | ans->expires= qu->expires; |
551ff40f |
494 | parent= qu->parent; |
495 | if (parent) { |
496 | LIST_UNLINK_PART(parent->children,qu,siblings.); |
4218fb9a |
497 | LIST_UNLINK(qu->ads->childw,parent); |
a6536d8b |
498 | qu->ctx.callback(parent,qu); |
551ff40f |
499 | free_query_allocs(qu); |
500 | free(qu); |
551ff40f |
501 | } else { |
502 | makefinal_query(qu); |
503 | LIST_LINK_TAIL(qu->ads->output,qu); |
33ae0ddd |
504 | qu->state= query_done; |
551ff40f |
505 | } |
656b2da9 |
506 | } |
507 | |
3955725c |
508 | void adns__query_fail(adns_query qu, adns_status stat) { |
8b3d55e3 |
509 | adns__reset_preserved(qu); |
8e5b0abb |
510 | qu->answer->status= stat; |
3955725c |
511 | adns__query_done(qu); |
656b2da9 |
512 | } |
e576be50 |
513 | |
514 | void adns__makefinal_str(adns_query qu, char **strp) { |
515 | int l; |
516 | char *before, *after; |
517 | |
518 | before= *strp; |
9557e604 |
519 | if (!before) return; |
e576be50 |
520 | l= strlen(before)+1; |
521 | after= adns__alloc_final(qu,l); |
522 | memcpy(after,before,l); |
523 | *strp= after; |
524 | } |
525 | |
3955725c |
526 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
9557e604 |
527 | void *before, *after; |
e576be50 |
528 | |
9557e604 |
529 | before= *blpp; |
530 | if (!before) return; |
e576be50 |
531 | after= adns__alloc_final(qu,sz); |
9557e604 |
532 | memcpy(after,before,sz); |
e576be50 |
533 | *blpp= after; |
534 | } |