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; |
228 | ol--; |
229 | } |
e576be50 |
230 | |
660d7d3b |
231 | if (flags & adns_qf_search) { |
232 | r= adns__vbuf_append(&qu->search_vb,owner,ol); |
233 | if (!r) { stat= adns_s_nomemory; goto x_adnsfail; } |
234 | |
235 | for (ndots=0, p=owner; (p= strchr(p,'.')); p++, ndots++); |
236 | qu->search_doneabs= (ndots >= ads->searchndots) ? -1 : 0; |
660d7d3b |
237 | qu->search_origlen= ol; |
660d7d3b |
238 | adns__search_next(ads,qu,now); |
e2632eb9 |
239 | } else { |
22181a31 |
240 | if (flags & adns_qf_owner) { |
241 | if (!save_owner(qu,owner,ol)) { stat= adns_s_nomemory; goto x_adnsfail; } |
242 | } |
e2632eb9 |
243 | query_simple(ads,qu, owner,ol, typei,flags, now); |
660d7d3b |
244 | } |
70ad7a2a |
245 | adns__autosys(ads,now); |
28de6442 |
246 | adns__consistency(ads,qu,cc_entex); |
660d7d3b |
247 | return 0; |
248 | |
249 | x_adnsfail: |
250 | adns__query_fail(qu,stat); |
28de6442 |
251 | adns__consistency(ads,qu,cc_entex); |
660d7d3b |
252 | return 0; |
253 | |
254 | x_errno: |
255 | r= errno; |
256 | assert(r); |
28de6442 |
257 | adns__consistency(ads,0,cc_entex); |
660d7d3b |
258 | return r; |
ddfda861 |
259 | } |
260 | |
d7449548 |
261 | int adns_submit_reverse(adns_state ads, |
262 | const struct sockaddr *addr, |
263 | adns_rrtype type, |
679ff49d |
264 | int flags, |
d7449548 |
265 | void *context, |
266 | adns_query *query_r) { |
267 | const unsigned char *iaddr; |
268 | char buf[30]; |
269 | |
270 | if (type != adns_r_ptr && type != adns_r_ptr_raw) return EINVAL; |
271 | flags &= ~adns_qf_search; |
272 | |
273 | if (addr->sa_family != AF_INET) return ENOSYS; |
274 | iaddr= (const unsigned char*) &(((const struct sockaddr_in*)addr) -> sin_addr); |
275 | |
276 | sprintf(buf, "%d.%d.%d.%d.in-addr.arpa", |
277 | iaddr[3], iaddr[2], iaddr[1], iaddr[0]); |
278 | |
279 | return adns_submit(ads,buf,type,flags,context,query_r); |
280 | } |
281 | |
e576be50 |
282 | int adns_synchronous(adns_state ads, |
283 | const char *owner, |
284 | adns_rrtype type, |
679ff49d |
285 | int flags, |
e576be50 |
286 | adns_answer **answer_r) { |
287 | adns_query qu; |
288 | int r; |
289 | |
290 | r= adns_submit(ads,owner,type,flags,0,&qu); |
291 | if (r) return r; |
4bec51a4 |
292 | |
88372443 |
293 | r= adns_wait(ads,&qu,answer_r,0); |
3955725c |
294 | if (r) adns_cancel(qu); |
ddfda861 |
295 | |
88372443 |
296 | return r; |
e576be50 |
297 | } |
298 | |
f759e52e |
299 | static void *alloc_common(adns_query qu, size_t sz) { |
e576be50 |
300 | allocnode *an; |
301 | |
a49a6d7b |
302 | if (!sz) return qu; /* Any old pointer will do */ |
e576be50 |
303 | assert(!qu->final_allocspace); |
e576be50 |
304 | an= malloc(MEM_ROUND(MEM_ROUND(sizeof(*an)) + sz)); |
e062dcae |
305 | if (!an) return 0; |
551ff40f |
306 | LIST_LINK_TAIL(qu->allocations,an); |
e576be50 |
307 | return (byte*)an + MEM_ROUND(sizeof(*an)); |
308 | } |
4bec51a4 |
309 | |
f759e52e |
310 | void *adns__alloc_interim(adns_query qu, size_t sz) { |
8b3d55e3 |
311 | void *rv; |
312 | |
f759e52e |
313 | sz= MEM_ROUND(sz); |
8b3d55e3 |
314 | rv= alloc_common(qu,sz); |
315 | if (!rv) return 0; |
f759e52e |
316 | qu->interim_allocd += sz; |
8b3d55e3 |
317 | return rv; |
318 | } |
319 | |
320 | void *adns__alloc_preserved(adns_query qu, size_t sz) { |
321 | void *rv; |
322 | |
323 | sz= MEM_ROUND(sz); |
324 | rv= adns__alloc_interim(qu,sz); |
325 | if (!rv) return 0; |
326 | qu->preserved_allocd += sz; |
327 | return rv; |
f759e52e |
328 | } |
329 | |
330 | void *adns__alloc_mine(adns_query qu, size_t sz) { |
331 | return alloc_common(qu,MEM_ROUND(sz)); |
332 | } |
333 | |
551ff40f |
334 | void adns__transfer_interim(adns_query from, adns_query to, void *block, size_t sz) { |
335 | allocnode *an; |
336 | |
337 | if (!block) return; |
338 | an= (void*)((byte*)block - MEM_ROUND(sizeof(*an))); |
339 | |
340 | assert(!to->final_allocspace); |
341 | assert(!from->final_allocspace); |
342 | |
343 | LIST_UNLINK(from->allocations,an); |
344 | LIST_LINK_TAIL(to->allocations,an); |
345 | |
346 | from->interim_allocd -= sz; |
347 | to->interim_allocd += sz; |
73dba56e |
348 | |
349 | if (to->expires > from->expires) to->expires= from->expires; |
551ff40f |
350 | } |
351 | |
e576be50 |
352 | void *adns__alloc_final(adns_query qu, size_t sz) { |
353 | /* When we're in the _final stage, we _subtract_ from interim_alloc'd |
354 | * each allocation, and use final_allocspace to point to the next free |
355 | * bit. |
356 | */ |
357 | void *rp; |
358 | |
359 | sz= MEM_ROUND(sz); |
360 | rp= qu->final_allocspace; |
361 | assert(rp); |
362 | qu->interim_allocd -= sz; |
363 | assert(qu->interim_allocd>=0); |
364 | qu->final_allocspace= (byte*)rp + sz; |
365 | return rp; |
366 | } |
367 | |
9ec44266 |
368 | static void cancel_children(adns_query qu) { |
369 | adns_query cqu, ncqu; |
370 | |
371 | for (cqu= qu->children.head; cqu; cqu= ncqu) { |
372 | ncqu= cqu->siblings.next; |
373 | adns_cancel(cqu); |
374 | } |
9ec44266 |
375 | } |
376 | |
8b3d55e3 |
377 | void adns__reset_preserved(adns_query qu) { |
9557e604 |
378 | assert(!qu->final_allocspace); |
9ec44266 |
379 | cancel_children(qu); |
e576be50 |
380 | qu->answer->nrrs= 0; |
71a6ff46 |
381 | qu->answer->rrs.untyped= 0; |
8b3d55e3 |
382 | qu->interim_allocd= qu->preserved_allocd; |
4353a5c4 |
383 | } |
384 | |
88372443 |
385 | static void free_query_allocs(adns_query qu) { |
386 | allocnode *an, *ann; |
88372443 |
387 | |
9ec44266 |
388 | cancel_children(qu); |
551ff40f |
389 | for (an= qu->allocations.head; an; an= ann) { ann= an->next; free(an); } |
bfc2c80e |
390 | LIST_INIT(qu->allocations); |
88372443 |
391 | adns__vbuf_free(&qu->vb); |
392 | } |
393 | |
1dfe95d8 |
394 | void adns_cancel(adns_query qu) { |
3e2e5fab |
395 | adns_state ads; |
396 | |
397 | ads= qu->ads; |
28de6442 |
398 | adns__consistency(ads,qu,cc_entex); |
33ae0ddd |
399 | if (qu->parent) LIST_UNLINK_PART(qu->parent->children,qu,siblings.); |
88372443 |
400 | switch (qu->state) { |
d8c062fa |
401 | case query_tosend: case query_tcpwait: case query_tcpsent: |
3e2e5fab |
402 | LIST_UNLINK(ads->timew,qu); |
88372443 |
403 | break; |
404 | case query_child: |
3e2e5fab |
405 | LIST_UNLINK(ads->childw,qu); |
88372443 |
406 | break; |
407 | case query_done: |
3e2e5fab |
408 | LIST_UNLINK(ads->output,qu); |
88372443 |
409 | break; |
410 | default: |
411 | abort(); |
412 | } |
413 | free_query_allocs(qu); |
414 | free(qu->answer); |
415 | free(qu); |
28de6442 |
416 | adns__consistency(ads,0,cc_entex); |
88372443 |
417 | } |
551ff40f |
418 | |
73dba56e |
419 | void adns__update_expires(adns_query qu, unsigned long ttl, struct timeval now) { |
420 | time_t max; |
421 | |
422 | assert(ttl <= MAXTTLBELIEVE); |
423 | max= now.tv_sec + ttl; |
424 | if (qu->expires < max) return; |
425 | qu->expires= max; |
426 | } |
427 | |
551ff40f |
428 | static void makefinal_query(adns_query qu) { |
98a3f706 |
429 | adns_answer *ans; |
88372443 |
430 | int rrn; |
8e5b0abb |
431 | |
88372443 |
432 | ans= qu->answer; |
551ff40f |
433 | |
88372443 |
434 | if (qu->interim_allocd) { |
88372443 |
435 | ans= realloc(qu->answer, MEM_ROUND(MEM_ROUND(sizeof(*ans)) + qu->interim_allocd)); |
551ff40f |
436 | if (!ans) goto x_nomem; |
e062dcae |
437 | qu->answer= ans; |
438 | } |
8e5b0abb |
439 | |
88372443 |
440 | qu->final_allocspace= (byte*)ans + MEM_ROUND(sizeof(*ans)); |
8e5b0abb |
441 | adns__makefinal_str(qu,&ans->cname); |
22181a31 |
442 | adns__makefinal_str(qu,&ans->owner); |
88372443 |
443 | |
8e5b0abb |
444 | if (ans->nrrs) { |
88372443 |
445 | adns__makefinal_block(qu, &ans->rrs.untyped, ans->nrrs*ans->rrsz); |
8e5b0abb |
446 | |
88372443 |
447 | for (rrn=0; rrn<ans->nrrs; rrn++) |
448 | qu->typei->makefinal(qu, ans->rrs.bytes + rrn*ans->rrsz); |
88372443 |
449 | } |
73dba56e |
450 | |
88372443 |
451 | free_query_allocs(qu); |
551ff40f |
452 | return; |
8e5b0abb |
453 | |
551ff40f |
454 | x_nomem: |
8b3d55e3 |
455 | qu->preserved_allocd= 0; |
551ff40f |
456 | qu->answer->cname= 0; |
8b3d55e3 |
457 | qu->answer->owner= 0; |
458 | adns__reset_preserved(qu); /* (but we just threw away the preserved stuff) */ |
459 | |
460 | qu->answer->status= adns_s_nomemory; |
551ff40f |
461 | free_query_allocs(qu); |
462 | } |
463 | |
464 | void adns__query_done(adns_query qu) { |
465 | adns_answer *ans; |
466 | adns_query parent; |
467 | |
4218fb9a |
468 | cancel_children(qu); |
469 | |
4353a5c4 |
470 | qu->id= -1; |
551ff40f |
471 | ans= qu->answer; |
472 | |
22181a31 |
473 | if (qu->flags & adns_qf_owner && qu->flags & adns_qf_search && |
474 | ans->status != adns_s_nomemory) { |
475 | if (!save_owner(qu, qu->search_vb.buf, qu->search_vb.used)) { |
476 | adns__query_fail(qu,adns_s_nomemory); |
477 | return; |
478 | } |
479 | } |
480 | |
551ff40f |
481 | if (ans->nrrs && qu->typei->diff_needswap) { |
482 | if (!adns__vbuf_ensure(&qu->vb,qu->typei->rrsz)) { |
ea1e31e3 |
483 | adns__query_fail(qu,adns_s_nomemory); |
551ff40f |
484 | return; |
485 | } |
486 | adns__isort(ans->rrs.bytes, ans->nrrs, ans->rrsz, |
09957b1c |
487 | qu->vb.buf, |
488 | (int(*)(void*, const void*, const void*))qu->typei->diff_needswap, |
489 | qu->ads); |
551ff40f |
490 | } |
e553d072 |
491 | |
73dba56e |
492 | ans->expires= qu->expires; |
551ff40f |
493 | parent= qu->parent; |
494 | if (parent) { |
495 | LIST_UNLINK_PART(parent->children,qu,siblings.); |
4218fb9a |
496 | LIST_UNLINK(qu->ads->childw,parent); |
a6536d8b |
497 | qu->ctx.callback(parent,qu); |
551ff40f |
498 | free_query_allocs(qu); |
499 | free(qu); |
551ff40f |
500 | } else { |
501 | makefinal_query(qu); |
502 | LIST_LINK_TAIL(qu->ads->output,qu); |
33ae0ddd |
503 | qu->state= query_done; |
551ff40f |
504 | } |
656b2da9 |
505 | } |
506 | |
3955725c |
507 | void adns__query_fail(adns_query qu, adns_status stat) { |
8b3d55e3 |
508 | adns__reset_preserved(qu); |
8e5b0abb |
509 | qu->answer->status= stat; |
3955725c |
510 | adns__query_done(qu); |
656b2da9 |
511 | } |
e576be50 |
512 | |
513 | void adns__makefinal_str(adns_query qu, char **strp) { |
514 | int l; |
515 | char *before, *after; |
516 | |
517 | before= *strp; |
9557e604 |
518 | if (!before) return; |
e576be50 |
519 | l= strlen(before)+1; |
520 | after= adns__alloc_final(qu,l); |
521 | memcpy(after,before,l); |
522 | *strp= after; |
523 | } |
524 | |
3955725c |
525 | void adns__makefinal_block(adns_query qu, void **blpp, size_t sz) { |
9557e604 |
526 | void *before, *after; |
e576be50 |
527 | |
9557e604 |
528 | before= *blpp; |
529 | if (!before) return; |
e576be50 |
530 | after= adns__alloc_final(qu,sz); |
9557e604 |
531 | memcpy(after,before,sz); |
e576be50 |
532 | *blpp= after; |
533 | } |