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7b724b86 | 1 | |
2 | /* | |
454e8283 | 3 | * $Id: dns_internal.cc,v 1.105 2008/01/20 19:46:35 serassio Exp $ |
7b724b86 | 4 | * |
5 | * DEBUG: section 78 DNS lookups; interacts with lib/rfc1035.c | |
6 | * AUTHOR: Duane Wessels | |
7 | * | |
2b6662ba | 8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
7b724b86 | 9 | * ---------------------------------------------------------- |
10 | * | |
2b6662ba | 11 | * Squid is the result of efforts by numerous individuals from |
12 | * the Internet community; see the CONTRIBUTORS file for full | |
13 | * details. Many organizations have provided support for Squid's | |
14 | * development; see the SPONSORS file for full details. Squid is | |
15 | * Copyrighted (C) 2001 by the Regents of the University of | |
16 | * California; see the COPYRIGHT file for full details. Squid | |
17 | * incorporates software developed and/or copyrighted by other | |
18 | * sources; see the CREDITS file for full details. | |
7b724b86 | 19 | * |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
24 | * | |
25 | * This program is distributed in the hope that it will be useful, | |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
29 | * | |
30 | * You should have received a copy of the GNU General Public License | |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
33 | * | |
34 | */ | |
35 | ||
d295d770 | 36 | #include "config.h" |
7b724b86 | 37 | #include "squid.h" |
a553a5a3 | 38 | #include "event.h" |
62ee09ca | 39 | #include "CacheManager.h" |
985c86bc | 40 | #include "SquidTime.h" |
e6ccf245 | 41 | #include "Store.h" |
063dc1eb | 42 | #include "comm.h" |
0eb49b6d | 43 | #include "MemBuf.h" |
7b724b86 | 44 | |
d295d770 | 45 | #include "wordlist.h" |
68836b58 | 46 | |
47 | #if HAVE_ARPA_NAMESER_H | |
48 | #include <arpa/nameser.h> | |
49 | #endif | |
50 | #if HAVE_RESOLV_H | |
51 | #include <resolv.h> | |
52 | #endif | |
53 | ||
454e8283 | 54 | /* MS Visual Studio Projects are monolithic, so we need the following |
1f1ae50a | 55 | #ifndef to exclude the internal DNS code from compile process when |
56 | using external DNS process. | |
57 | */ | |
58 | #ifndef USE_DNSSERVERS | |
ec4daaa5 | 59 | #ifdef _SQUID_WIN32_ |
1a774556 | 60 | #include "squid_windows.h" |
0e6d05ef | 61 | #endif |
68836b58 | 62 | #ifndef _PATH_RESCONF |
63 | #define _PATH_RESCONF "/etc/resolv.conf" | |
64 | #endif | |
65 | #ifndef NS_DEFAULTPORT | |
66 | #define NS_DEFAULTPORT 53 | |
67 | #endif | |
68 | ||
69 | #ifndef NS_MAXDNAME | |
70 | #define NS_MAXDNAME 1025 | |
71 | #endif | |
72 | ||
73 | #ifndef MAXDNSRCH | |
74 | #define MAXDNSRCH 6 | |
7b724b86 | 75 | #endif |
68836b58 | 76 | |
77 | /* The buffer size required to store the maximum allowed search path */ | |
78 | #ifndef RESOLV_BUFSZ | |
79 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 80 | #endif |
81 | ||
42b51993 | 82 | #define IDNS_MAX_TRIES 20 |
558be27a | 83 | #define MAX_RCODE 6 |
84 | #define MAX_ATTEMPT 3 | |
85 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
86 | ||
58a39dc9 | 87 | typedef struct _idns_query idns_query; |
62e76326 | 88 | |
7b724b86 | 89 | typedef struct _ns ns; |
58a39dc9 | 90 | |
68836b58 | 91 | typedef struct _sp sp; |
92 | ||
d24ef4e9 | 93 | typedef struct _nsvc nsvc; |
94 | ||
62e76326 | 95 | struct _idns_query |
96 | { | |
3074b9d1 | 97 | hash_link hash; |
9e1f210d | 98 | rfc1035_query query; |
68836b58 | 99 | char buf[RESOLV_BUFSZ]; |
100 | char name[NS_MAXDNAME + 1]; | |
101 | char orig[NS_MAXDNAME + 1]; | |
58a39dc9 | 102 | size_t sz; |
103 | unsigned short id; | |
104 | int nsends; | |
d24ef4e9 | 105 | int need_vc; |
62e76326 | 106 | |
58a39dc9 | 107 | struct timeval start_t; |
62e76326 | 108 | |
58a39dc9 | 109 | struct timeval sent_t; |
110 | dlink_node lru; | |
111 | IDNSCB *callback; | |
112 | void *callback_data; | |
558be27a | 113 | int attempt; |
7ba8d0b8 | 114 | const char *error; |
115 | int rcode; | |
3074b9d1 | 116 | idns_query *queue; |
68836b58 | 117 | unsigned short domain; |
118 | unsigned short do_searchpath; | |
cc192b50 | 119 | bool need_A; |
bae9832d | 120 | struct { |
121 | int count; | |
122 | rfc1035_rr *answers; | |
123 | } initial_AAAA; | |
58a39dc9 | 124 | }; |
125 | ||
d24ef4e9 | 126 | struct _nsvc |
127 | { | |
128 | int ns; | |
129 | int fd; | |
130 | unsigned short msglen; | |
131 | int read_msglen; | |
032785bf | 132 | MemBuf *msg; |
133 | MemBuf *queue; | |
d24ef4e9 | 134 | bool busy; |
135 | }; | |
136 | ||
62e76326 | 137 | struct _ns |
138 | { | |
cc192b50 | 139 | IPAddress S; |
7b724b86 | 140 | int nqueries; |
141 | int nreplies; | |
d24ef4e9 | 142 | nsvc *vc; |
7b724b86 | 143 | }; |
58a39dc9 | 144 | |
68836b58 | 145 | struct _sp |
146 | { | |
147 | char domain[NS_MAXDNAME]; | |
148 | int queries; | |
149 | }; | |
150 | ||
d24ef4e9 | 151 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 152 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 153 | |
7b724b86 | 154 | static ns *nameservers = NULL; |
68836b58 | 155 | static sp *searchpath = NULL; |
7b724b86 | 156 | static int nns = 0; |
157 | static int nns_alloc = 0; | |
68836b58 | 158 | static int npc = 0; |
159 | static int npc_alloc = 0; | |
160 | static int ndots = 1; | |
7b724b86 | 161 | static dlink_list lru_list; |
7cfc1c9a | 162 | static int event_queued = 0; |
3074b9d1 | 163 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 164 | |
165 | static OBJH idnsStats; | |
166 | static void idnsAddNameserver(const char *buf); | |
68836b58 | 167 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 168 | static void idnsFreeNameservers(void); |
68836b58 | 169 | static void idnsFreeSearchpath(void); |
efd900cb | 170 | static void idnsParseNameservers(void); |
1f1ae50a | 171 | #ifndef _SQUID_MSWIN_ |
7b724b86 | 172 | static void idnsParseResolvConf(void); |
1f1ae50a | 173 | #endif |
ec4daaa5 | 174 | #ifdef _SQUID_WIN32_ |
0e6d05ef | 175 | static void idnsParseWIN32Registry(void); |
d02b72b4 | 176 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 177 | #endif |
68836b58 | 178 | static void idnsCacheQuery(idns_query * q); |
7b724b86 | 179 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 180 | static IOCB idnsReadVCHeader; |
63a0e6b7 | 181 | static void idnsDoSendQueryVC(nsvc *vc); |
62e76326 | 182 | |
cc192b50 | 183 | static int idnsFromKnownNameserver(IPAddress const &from); |
7b724b86 | 184 | static idns_query *idnsFindQuery(unsigned short id); |
185 | static void idnsGrokReply(const char *buf, size_t sz); | |
186 | static PF idnsRead; | |
7cfc1c9a | 187 | static EVH idnsCheckQueue; |
efd900cb | 188 | static void idnsTickleQueue(void); |
558be27a | 189 | static void idnsRcodeCount(int, int); |
7b724b86 | 190 | |
191 | static void | |
192 | idnsAddNameserver(const char *buf) | |
193 | { | |
cc192b50 | 194 | IPAddress A; |
62e76326 | 195 | |
cc192b50 | 196 | if (!(A = buf)) { |
bf8fe701 | 197 | debugs(78, 0, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 198 | return; |
d20b1cd0 | 199 | } |
62e76326 | 200 | |
cc192b50 | 201 | if (A.IsAnyAddr()) { |
202 | debugs(78, 0, "WARNING: Squid does not accept " << A << " in DNS server specifications."); | |
203 | A = "127.0.0.1"; | |
204 | debugs(78, 0, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); | |
5c5a349d | 205 | } |
62e76326 | 206 | |
7b724b86 | 207 | if (nns == nns_alloc) { |
62e76326 | 208 | int oldalloc = nns_alloc; |
209 | ns *oldptr = nameservers; | |
210 | ||
211 | if (nns_alloc == 0) | |
212 | nns_alloc = 2; | |
213 | else | |
214 | nns_alloc <<= 1; | |
215 | ||
216 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
217 | ||
218 | if (oldptr && oldalloc) | |
219 | xmemcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); | |
220 | ||
221 | if (oldptr) | |
222 | safe_free(oldptr); | |
7b724b86 | 223 | } |
62e76326 | 224 | |
7b724b86 | 225 | assert(nns < nns_alloc); |
cc192b50 | 226 | A.SetPort(NS_DEFAULTPORT); |
227 | nameservers[nns].S = A; | |
228 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); | |
7b724b86 | 229 | nns++; |
230 | } | |
231 | ||
68836b58 | 232 | static void |
233 | idnsAddPathComponent(const char *buf) | |
234 | { | |
235 | if (npc == npc_alloc) { | |
236 | int oldalloc = npc_alloc; | |
237 | sp *oldptr = searchpath; | |
238 | ||
239 | if (0 == npc_alloc) | |
240 | npc_alloc = 2; | |
241 | else | |
242 | npc_alloc <<= 1; | |
243 | ||
244 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
245 | ||
246 | if (oldptr && oldalloc) | |
247 | xmemcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); | |
248 | ||
249 | if (oldptr) | |
250 | safe_free(oldptr); | |
251 | } | |
252 | ||
253 | assert(npc < npc_alloc); | |
254 | strcpy(searchpath[npc].domain, buf); | |
bf8fe701 | 255 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
68836b58 | 256 | npc++; |
257 | } | |
258 | ||
2ea84e89 | 259 | |
7b724b86 | 260 | static void |
261 | idnsFreeNameservers(void) | |
262 | { | |
263 | safe_free(nameservers); | |
264 | nns = nns_alloc = 0; | |
265 | } | |
266 | ||
68836b58 | 267 | static void |
268 | idnsFreeSearchpath(void) | |
269 | { | |
270 | safe_free(searchpath); | |
271 | npc = npc_alloc = 0; | |
272 | } | |
273 | ||
274 | ||
275 | ||
efd900cb | 276 | static void |
277 | idnsParseNameservers(void) | |
278 | { | |
279 | wordlist *w; | |
62e76326 | 280 | |
efd900cb | 281 | for (w = Config.dns_nameservers; w; w = w->next) { |
bf8fe701 | 282 | debugs(78, 1, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 283 | idnsAddNameserver(w->key); |
efd900cb | 284 | } |
285 | } | |
286 | ||
1f1ae50a | 287 | #ifndef _SQUID_MSWIN_ |
7b724b86 | 288 | static void |
289 | idnsParseResolvConf(void) | |
290 | { | |
291 | FILE *fp; | |
68836b58 | 292 | char buf[RESOLV_BUFSZ]; |
7b724b86 | 293 | char *t; |
68836b58 | 294 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 295 | |
7b724b86 | 296 | if (fp == NULL) { |
bf8fe701 | 297 | debugs(78, 1, "" << _PATH_RESCONF << ": " << xstrerror()); |
62e76326 | 298 | return; |
7b724b86 | 299 | } |
62e76326 | 300 | |
1f1ae50a | 301 | #if defined(_SQUID_CYGWIN_) |
c4aefe96 | 302 | setmode(fileno(fp), O_TEXT); |
62e76326 | 303 | |
c4aefe96 | 304 | #endif |
62e76326 | 305 | |
68836b58 | 306 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 307 | t = strtok(buf, w_space); |
308 | ||
68836b58 | 309 | if (NULL == t) { |
62e76326 | 310 | continue; |
68836b58 | 311 | } else if (strcasecmp(t, "nameserver") == 0) { |
312 | t = strtok(NULL, w_space); | |
62e76326 | 313 | |
68836b58 | 314 | if (NULL == t) |
315 | continue; | |
62e76326 | 316 | |
bf8fe701 | 317 | debugs(78, 1, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 318 | |
68836b58 | 319 | idnsAddNameserver(t); |
320 | } else if (strcasecmp(t, "search") == 0) { | |
321 | while (NULL != t) { | |
322 | t = strtok(NULL, w_space); | |
323 | ||
324 | if (NULL == t) | |
325 | continue; | |
326 | ||
bf8fe701 | 327 | debugs(78, 1, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 328 | |
329 | idnsAddPathComponent(t); | |
330 | } | |
331 | } else if (strcasecmp(t, "options") == 0) { | |
332 | while (NULL != t) { | |
333 | t = strtok(NULL, w_space); | |
62e76326 | 334 | |
68836b58 | 335 | if (NULL == t) |
336 | continue; | |
62e76326 | 337 | |
68836b58 | 338 | if (strncmp(t, "ndots:", 6) != 0) { |
339 | ndots = atoi(t + 6); | |
340 | ||
341 | if (ndots < 1) | |
342 | ndots = 1; | |
343 | ||
bf8fe701 | 344 | debugs(78, 1, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 345 | } |
346 | } | |
347 | } | |
7b724b86 | 348 | } |
62e76326 | 349 | |
7b724b86 | 350 | fclose(fp); |
351 | } | |
352 | ||
1f1ae50a | 353 | #endif |
354 | ||
ec4daaa5 | 355 | #ifdef _SQUID_WIN32_ |
6b610e34 | 356 | static void |
d02b72b4 | 357 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 358 | { |
359 | BYTE *t; | |
360 | char *token; | |
361 | HKEY hndKey; | |
362 | ||
363 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
364 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters", | |
365 | &hndKey) == ERROR_SUCCESS) { | |
366 | DWORD Type = 0; | |
367 | DWORD Size = 0; | |
368 | LONG Result; | |
369 | Result = | |
370 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, | |
371 | &Size); | |
372 | ||
373 | if (Result == ERROR_SUCCESS && Size) { | |
374 | t = (unsigned char *) xmalloc(Size); | |
375 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, t, | |
376 | &Size); | |
377 | token = strtok((char *) t, Separator); | |
378 | ||
379 | while (token) { | |
380 | idnsAddPathComponent(token); | |
381 | debugs(78, 1, "Adding domain " << token << " from Registry"); | |
382 | token = strtok(NULL, Separator); | |
383 | } | |
384 | } | |
385 | ||
386 | RegCloseKey(hndKey); | |
387 | } | |
388 | } | |
389 | ||
0e6d05ef | 390 | static void |
391 | idnsParseWIN32Registry(void) | |
392 | { | |
e6ccf245 | 393 | BYTE *t; |
0e6d05ef | 394 | char *token; |
395 | HKEY hndKey, hndKey2; | |
396 | ||
397 | idnsFreeNameservers(); | |
62e76326 | 398 | |
0e6d05ef | 399 | switch (WIN32_OS_version) { |
62e76326 | 400 | |
0e6d05ef | 401 | case _WIN_OS_WINNT: |
62e76326 | 402 | /* get nameservers from the Windows NT registry */ |
403 | ||
404 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
405 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters", | |
406 | &hndKey) == ERROR_SUCCESS) { | |
407 | DWORD Type = 0; | |
408 | DWORD Size = 0; | |
409 | LONG Result; | |
410 | Result = | |
411 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, | |
412 | &Size); | |
413 | ||
414 | if (Result == ERROR_SUCCESS && Size) { | |
415 | t = (unsigned char *) xmalloc(Size); | |
416 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, t, | |
417 | &Size); | |
418 | token = strtok((char *) t, ", "); | |
419 | ||
420 | while (token) { | |
421 | idnsAddNameserver(token); | |
6b610e34 | 422 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
423 | token = strtok(NULL, ","); | |
62e76326 | 424 | } |
425 | } | |
426 | ||
427 | Result = | |
428 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); | |
429 | ||
430 | if (Result == ERROR_SUCCESS && Size) { | |
431 | t = (unsigned char *) xmalloc(Size); | |
432 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, t, &Size); | |
433 | token = strtok((char *) t, ", "); | |
434 | ||
435 | while (token) { | |
6b610e34 | 436 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 437 | idnsAddNameserver(token); |
438 | token = strtok(NULL, ", "); | |
439 | } | |
440 | } | |
441 | ||
442 | RegCloseKey(hndKey); | |
443 | } | |
444 | ||
6b610e34 | 445 | idnsParseWIN32SearchList(" "); |
446 | ||
62e76326 | 447 | break; |
448 | ||
0e6d05ef | 449 | case _WIN_OS_WIN2K: |
62e76326 | 450 | |
b671cc68 | 451 | case _WIN_OS_WINXP: |
62e76326 | 452 | |
6b1846cf | 453 | case _WIN_OS_WINNET: |
28170269 | 454 | |
455 | case _WIN_OS_WINLON: | |
62e76326 | 456 | /* get nameservers from the Windows 2000 registry */ |
457 | /* search all interfaces for DNS server addresses */ | |
458 | ||
459 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
460 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces", | |
461 | &hndKey) == ERROR_SUCCESS) { | |
462 | int i; | |
463 | char keyname[255]; | |
464 | ||
465 | for (i = 0; i < 10; i++) { | |
466 | if (RegEnumKey(hndKey, i, (char *) &keyname, | |
467 | 255) == ERROR_SUCCESS) { | |
468 | char newkeyname[255]; | |
469 | strcpy(newkeyname, | |
470 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\"); | |
471 | strcat(newkeyname, keyname); | |
472 | ||
473 | if (RegOpenKey(HKEY_LOCAL_MACHINE, newkeyname, | |
474 | &hndKey2) == ERROR_SUCCESS) { | |
475 | DWORD Type = 0; | |
476 | DWORD Size = 0; | |
477 | LONG Result; | |
478 | Result = | |
479 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, | |
480 | &Type, NULL, &Size); | |
481 | ||
482 | if (Result == ERROR_SUCCESS && Size) { | |
483 | t = (unsigned char *) xmalloc(Size); | |
484 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, | |
485 | &Type, t, &Size); | |
486 | token = strtok((char *) t, ", "); | |
487 | ||
488 | while (token) { | |
6b610e34 | 489 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
62e76326 | 490 | idnsAddNameserver(token); |
491 | token = strtok(NULL, ", "); | |
492 | } | |
493 | } | |
494 | ||
495 | Result = | |
496 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, | |
497 | NULL, &Size); | |
498 | ||
499 | if (Result == ERROR_SUCCESS && Size) { | |
500 | t = (unsigned char *) xmalloc(Size); | |
501 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, | |
502 | t, &Size); | |
503 | token = strtok((char *) t, ", "); | |
504 | ||
505 | while (token) { | |
6b610e34 | 506 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 507 | idnsAddNameserver(token); |
508 | token = strtok(NULL, ", "); | |
509 | } | |
510 | } | |
511 | ||
512 | RegCloseKey(hndKey2); | |
513 | } | |
514 | } | |
515 | } | |
516 | ||
517 | RegCloseKey(hndKey); | |
518 | } | |
519 | ||
6b610e34 | 520 | idnsParseWIN32SearchList(", "); |
521 | ||
62e76326 | 522 | break; |
523 | ||
0e6d05ef | 524 | case _WIN_OS_WIN95: |
62e76326 | 525 | |
0e6d05ef | 526 | case _WIN_OS_WIN98: |
62e76326 | 527 | |
be20dac7 | 528 | case _WIN_OS_WINME: |
62e76326 | 529 | /* get nameservers from the Windows 9X registry */ |
530 | ||
531 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
532 | "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP", | |
533 | &hndKey) == ERROR_SUCCESS) { | |
534 | DWORD Type = 0; | |
535 | DWORD Size = 0; | |
536 | LONG Result; | |
537 | Result = | |
538 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); | |
539 | ||
540 | if (Result == ERROR_SUCCESS && Size) { | |
541 | t = (unsigned char *) xmalloc(Size); | |
542 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, t, &Size); | |
543 | token = strtok((char *) t, ", "); | |
544 | ||
545 | while (token) { | |
6b610e34 | 546 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 547 | idnsAddNameserver(token); |
548 | token = strtok(NULL, ", "); | |
549 | } | |
550 | } | |
551 | ||
552 | RegCloseKey(hndKey); | |
553 | } | |
554 | ||
555 | break; | |
556 | ||
0e6d05ef | 557 | default: |
6b610e34 | 558 | debugs(78, 1, "Failed to read nameserver from Registry: Unknown System Type."); |
62e76326 | 559 | return; |
0e6d05ef | 560 | } |
561 | } | |
62e76326 | 562 | |
0e6d05ef | 563 | #endif |
564 | ||
7b724b86 | 565 | static void |
566 | idnsStats(StoreEntry * sentry) | |
567 | { | |
a16b4aa0 | 568 | dlink_node *n; |
569 | idns_query *q; | |
7cfc1c9a | 570 | int i; |
558be27a | 571 | int j; |
cc192b50 | 572 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 573 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 574 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 575 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
576 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND\n"); | |
577 | storeAppendPrintf(sentry, "------ ---- ----- ---------- ---------\n"); | |
62e76326 | 578 | |
a16b4aa0 | 579 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 580 | q = (idns_query *)n->data; |
581 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f\n", | |
582 | (int) q->id, (int) q->sz, q->nsends, | |
583 | tvSubDsec(q->start_t, current_time), | |
584 | tvSubDsec(q->sent_t, current_time)); | |
7cfc1c9a | 585 | } |
62e76326 | 586 | |
7cfc1c9a | 587 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
cc192b50 | 588 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES\n"); |
589 | storeAppendPrintf(sentry, "---------------------------------------------- --------- ---------\n"); | |
62e76326 | 590 | |
7cfc1c9a | 591 | for (i = 0; i < nns; i++) { |
cc192b50 | 592 | storeAppendPrintf(sentry, "%-45s %9d %9d\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
593 | nameservers[i].S.NtoA(buf,MAX_IPSTRLEN), | |
62e76326 | 594 | nameservers[i].nqueries, |
595 | nameservers[i].nreplies); | |
a16b4aa0 | 596 | } |
62e76326 | 597 | |
558be27a | 598 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
599 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 600 | |
558be27a | 601 | for (i = 0; i < MAX_ATTEMPT; i++) |
62e76326 | 602 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
603 | ||
7928b8df | 604 | storeAppendPrintf(sentry, "\n"); |
62e76326 | 605 | |
558be27a | 606 | for (j = 0; j < MAX_RCODE; j++) { |
62e76326 | 607 | storeAppendPrintf(sentry, "%5d", j); |
608 | ||
609 | for (i = 0; i < MAX_ATTEMPT; i++) | |
610 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); | |
611 | ||
612 | storeAppendPrintf(sentry, "\n"); | |
558be27a | 613 | } |
6b610e34 | 614 | |
615 | if (npc) { | |
616 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
617 | ||
618 | for (i=0; i < npc; i++) | |
619 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); | |
620 | ||
621 | storeAppendPrintf(sentry, "\n"); | |
622 | } | |
7b724b86 | 623 | } |
624 | ||
efd900cb | 625 | static void |
626 | idnsTickleQueue(void) | |
627 | { | |
628 | if (event_queued) | |
62e76326 | 629 | return; |
630 | ||
efd900cb | 631 | if (NULL == lru_list.tail) |
62e76326 | 632 | return; |
633 | ||
efd900cb | 634 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, 1.0, 1); |
62e76326 | 635 | |
efd900cb | 636 | event_queued = 1; |
637 | } | |
638 | ||
d24ef4e9 | 639 | static void |
2b663917 | 640 | idnsSentQueryVC(int fd, char *buf, size_t size, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 641 | { |
642 | nsvc * vc = (nsvc *)data; | |
643 | ||
644 | if (flag == COMM_ERR_CLOSING) | |
645 | return; | |
646 | ||
647 | if (flag != COMM_OK || size <= 0) { | |
648 | comm_close(fd); | |
649 | return; | |
650 | } | |
651 | ||
652 | vc->busy = 0; | |
653 | idnsDoSendQueryVC(vc); | |
654 | } | |
655 | ||
656 | static void | |
657 | idnsDoSendQueryVC(nsvc *vc) | |
658 | { | |
659 | if (vc->busy) | |
660 | return; | |
661 | ||
032785bf | 662 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 663 | return; |
664 | ||
032785bf | 665 | MemBuf *mb = vc->queue; |
d24ef4e9 | 666 | |
032785bf | 667 | vc->queue = new MemBuf; |
d24ef4e9 | 668 | |
669 | vc->busy = 1; | |
670 | ||
671 | commSetTimeout(vc->fd, Config.Timeout.idns_query, NULL, NULL); | |
672 | ||
2b663917 | 673 | comm_write_mbuf(vc->fd, mb, idnsSentQueryVC, vc); |
032785bf | 674 | |
675 | delete mb; | |
d24ef4e9 | 676 | } |
677 | ||
678 | static void | |
679 | idnsInitVCConnected(int fd, comm_err_t status, int xerrno, void *data) | |
680 | { | |
681 | nsvc * vc = (nsvc *)data; | |
682 | ||
683 | if (status != COMM_OK) { | |
684 | comm_close(fd); | |
685 | return; | |
686 | } | |
687 | ||
688 | comm_read(fd, (char *)&vc->msglen, 2 , idnsReadVCHeader, vc); | |
689 | vc->busy = 0; | |
690 | idnsDoSendQueryVC(vc); | |
691 | } | |
692 | ||
693 | static void | |
694 | idnsVCClosed(int fd, void *data) | |
695 | { | |
696 | nsvc * vc = (nsvc *)data; | |
032785bf | 697 | delete vc->queue; |
698 | delete vc->msg; | |
d24ef4e9 | 699 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 700 | cbdataFree(vc); |
d24ef4e9 | 701 | } |
702 | ||
703 | static void | |
704 | idnsInitVC(int ns) | |
705 | { | |
cc192b50 | 706 | char buf[MAX_IPSTRLEN]; |
707 | ||
d24ef4e9 | 708 | nsvc *vc = cbdataAlloc(nsvc); |
709 | nameservers[ns].vc = vc; | |
710 | ||
cc192b50 | 711 | IPAddress addr; |
d24ef4e9 | 712 | |
cc192b50 | 713 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
d24ef4e9 | 714 | addr = Config.Addrs.udp_outgoing; |
715 | else | |
716 | addr = Config.Addrs.udp_incoming; | |
717 | ||
032785bf | 718 | vc->queue = new MemBuf; |
d24ef4e9 | 719 | |
032785bf | 720 | vc->msg = new MemBuf; |
d24ef4e9 | 721 | |
722 | vc->fd = comm_open(SOCK_STREAM, | |
723 | IPPROTO_TCP, | |
724 | addr, | |
d24ef4e9 | 725 | COMM_NONBLOCKING, |
63a0e6b7 | 726 | "DNS TCP Socket"); |
d24ef4e9 | 727 | |
728 | if (vc->fd < 0) | |
729 | fatal("Could not create a DNS socket"); | |
730 | ||
731 | comm_add_close_handler(vc->fd, idnsVCClosed, vc); | |
732 | ||
733 | vc->busy = 1; | |
734 | ||
cc192b50 | 735 | commConnectStart(vc->fd, nameservers[ns].S.NtoA(buf,MAX_IPSTRLEN), nameservers[ns].S.GetPort(), idnsInitVCConnected, vc); |
d24ef4e9 | 736 | } |
737 | ||
738 | static void | |
739 | idnsSendQueryVC(idns_query * q, int ns) | |
740 | { | |
741 | if (nameservers[ns].vc == NULL) | |
742 | idnsInitVC(ns); | |
743 | ||
744 | nsvc *vc = nameservers[ns].vc; | |
745 | ||
2fe7eff9 | 746 | vc->queue->reset(); |
d24ef4e9 | 747 | |
748 | short head = htons(q->sz); | |
749 | ||
2fe7eff9 | 750 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 751 | |
2fe7eff9 | 752 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 753 | |
754 | idnsDoSendQueryVC(vc); | |
755 | } | |
756 | ||
7b724b86 | 757 | static void |
758 | idnsSendQuery(idns_query * q) | |
759 | { | |
760 | int x; | |
ef523f99 | 761 | int ns; |
62e76326 | 762 | |
0a69973e | 763 | if (DnsSocket < 0) { |
cc192b50 | 764 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 765 | return; |
0a69973e | 766 | } |
62e76326 | 767 | |
cc192b50 | 768 | if (nns <= 0) { |
769 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); | |
770 | return; | |
771 | } | |
62e76326 | 772 | |
7b724b86 | 773 | assert(q->lru.next == NULL); |
62e76326 | 774 | |
7b724b86 | 775 | assert(q->lru.prev == NULL); |
62e76326 | 776 | |
213b6c90 AJ |
777 | do { |
778 | ns = q->nsends % nns; | |
779 | ||
780 | if (q->need_vc) { | |
781 | idnsSendQueryVC(q, ns); | |
782 | x = 0; | |
783 | } else { | |
784 | x = comm_udp_sendto(DnsSocket, nameservers[ns].S, q->buf, q->sz); | |
785 | } | |
62e76326 | 786 | |
213b6c90 | 787 | q->nsends++; |
62e76326 | 788 | |
213b6c90 | 789 | q->sent_t = current_time; |
62e76326 | 790 | |
213b6c90 AJ |
791 | if (x < 0) |
792 | debugs(50, 1, "idnsSendQuery: FD " << DnsSocket << ": sendto: " << xstrerror()); | |
62e76326 | 793 | |
213b6c90 | 794 | } while( x<0 && q->nsends % nns != 0); |
62e76326 | 795 | |
213b6c90 | 796 | if(x >= 0) { |
62e76326 | 797 | fd_bytes(DnsSocket, x, FD_WRITE); |
798 | commSetSelect(DnsSocket, COMM_SELECT_READ, idnsRead, NULL, 0); | |
0a69973e | 799 | } |
62e76326 | 800 | |
7cfc1c9a | 801 | nameservers[ns].nqueries++; |
7b724b86 | 802 | dlinkAdd(q, &q->lru, &lru_list); |
efd900cb | 803 | idnsTickleQueue(); |
7b724b86 | 804 | } |
805 | ||
806 | static int | |
cc192b50 | 807 | idnsFromKnownNameserver(IPAddress const &from) |
7b724b86 | 808 | { |
809 | int i; | |
62e76326 | 810 | |
811 | for (i = 0; i < nns; i++) | |
812 | { | |
cc192b50 | 813 | if (nameservers[i].S != from) |
62e76326 | 814 | continue; |
815 | ||
cc192b50 | 816 | if (nameservers[i].S.GetPort() != from.GetPort()) |
62e76326 | 817 | continue; |
818 | ||
819 | return i; | |
7b724b86 | 820 | } |
62e76326 | 821 | |
7cfc1c9a | 822 | return -1; |
7b724b86 | 823 | } |
824 | ||
825 | static idns_query * | |
826 | idnsFindQuery(unsigned short id) | |
827 | { | |
828 | dlink_node *n; | |
829 | idns_query *q; | |
62e76326 | 830 | |
7b724b86 | 831 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 832 | q = (idns_query*)n->data; |
833 | ||
834 | if (q->id == id) | |
835 | return q; | |
7b724b86 | 836 | } |
62e76326 | 837 | |
7b724b86 | 838 | return NULL; |
839 | } | |
840 | ||
108d67a0 | 841 | static unsigned short |
842 | idnsQueryID(void) | |
843 | { | |
844 | unsigned short id = squid_random() & 0xFFFF; | |
845 | unsigned short first_id = id; | |
846 | ||
847 | while(idnsFindQuery(id)) { | |
848 | id++; | |
849 | ||
846c8960 | 850 | if (id == first_id) { |
bf8fe701 | 851 | debugs(78, 1, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 852 | break; |
846c8960 | 853 | } |
108d67a0 | 854 | } |
855 | ||
846c8960 | 856 | return id; |
108d67a0 | 857 | } |
858 | ||
3074b9d1 | 859 | static void |
860 | idnsCallback(idns_query *q, rfc1035_rr *answers, int n, const char *error) | |
861 | { | |
862 | IDNSCB *callback; | |
863 | void *cbdata; | |
864 | ||
865 | callback = q->callback; | |
866 | q->callback = NULL; | |
867 | ||
868 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
869 | callback(cbdata, answers, n, error); | |
870 | ||
871 | while(q->queue) { | |
872 | idns_query *q2 = q->queue; | |
873 | q->queue = q2->queue; | |
874 | callback = q2->callback; | |
875 | q2->callback = NULL; | |
876 | ||
877 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
878 | callback(cbdata, answers, n, error); | |
879 | ||
63a0e6b7 | 880 | cbdataFree(q2); |
3074b9d1 | 881 | } |
882 | ||
883 | if (q->hash.key) { | |
884 | hash_remove_link(idns_lookup_hash, &q->hash); | |
885 | q->hash.key = NULL; | |
886 | } | |
887 | } | |
888 | ||
cc192b50 | 889 | void |
890 | idnsDropMessage(rfc1035_message *message, idns_query *q) | |
891 | { | |
892 | rfc1035MessageDestroy(&message); | |
893 | if (q->hash.key) { | |
894 | hash_remove_link(idns_lookup_hash, &q->hash); | |
895 | q->hash.key = NULL; | |
896 | } | |
897 | } | |
898 | ||
7b724b86 | 899 | static void |
900 | idnsGrokReply(const char *buf, size_t sz) | |
901 | { | |
902 | int n; | |
ec7bade0 | 903 | rfc1035_message *message = NULL; |
7b724b86 | 904 | idns_query *q; |
3074b9d1 | 905 | |
cc192b50 | 906 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 907 | |
ec7bade0 | 908 | if (message == NULL) { |
bf8fe701 | 909 | debugs(78, 1, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 910 | return; |
7b724b86 | 911 | } |
62e76326 | 912 | |
cc192b50 | 913 | debugs(78, 3, "idnsGrokReply: ID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 914 | |
915 | q = idnsFindQuery(message->id); | |
916 | ||
7b724b86 | 917 | if (q == NULL) { |
bf8fe701 | 918 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 919 | rfc1035MessageDestroy(&message); |
62e76326 | 920 | return; |
7b724b86 | 921 | } |
62e76326 | 922 | |
9e1f210d | 923 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 924 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 925 | rfc1035MessageDestroy(&message); |
9e1f210d | 926 | return; |
927 | } | |
928 | ||
d24ef4e9 | 929 | if (message->tc) { |
bae9832d | 930 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
d24ef4e9 | 931 | dlinkDelete(&q->lru, &lru_list); |
cc192b50 | 932 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 933 | |
934 | if (!q->need_vc) { | |
935 | q->need_vc = 1; | |
936 | q->nsends--; | |
937 | idnsSendQuery(q); | |
938 | } | |
939 | ||
940 | return; | |
941 | } | |
9e1f210d | 942 | |
a16b4aa0 | 943 | dlinkDelete(&q->lru, &lru_list); |
558be27a | 944 | idnsRcodeCount(n, q->attempt); |
7ba8d0b8 | 945 | q->error = NULL; |
62e76326 | 946 | |
558be27a | 947 | if (n < 0) { |
bf8fe701 | 948 | debugs(78, 3, "idnsGrokReply: error " << rfc1035_error_message << " (" << rfc1035_errno << ")"); |
62e76326 | 949 | |
7ba8d0b8 | 950 | q->error = rfc1035_error_message; |
951 | q->rcode = -n; | |
952 | ||
953 | if (q->rcode == 2 && ++q->attempt < MAX_ATTEMPT) { | |
62e76326 | 954 | /* |
955 | * RCODE 2 is "Server failure - The name server was | |
956 | * unable to process this query due to a problem with | |
957 | * the name server." | |
958 | */ | |
cc192b50 | 959 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
960 | rfc1035MessageDestroy(&message); | |
62e76326 | 961 | q->start_t = current_time; |
108d67a0 | 962 | q->id = idnsQueryID(); |
963 | rfc1035SetQueryID(q->buf, q->id); | |
62e76326 | 964 | idnsSendQuery(q); |
965 | return; | |
966 | } | |
68836b58 | 967 | |
968 | if (q->rcode == 3 && q->do_searchpath && q->attempt < MAX_ATTEMPT) { | |
969 | assert(NULL == message->answer); | |
970 | strcpy(q->name, q->orig); | |
971 | ||
cc192b50 | 972 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
973 | ||
68836b58 | 974 | if (q->domain < npc) { |
975 | strcat(q->name, "."); | |
976 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 977 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
68836b58 | 978 | q->domain++; |
979 | } else { | |
980 | q->attempt++; | |
981 | } | |
982 | ||
cc192b50 | 983 | idnsDropMessage(message, q); |
984 | ||
68836b58 | 985 | q->start_t = current_time; |
986 | q->id = idnsQueryID(); | |
987 | rfc1035SetQueryID(q->buf, q->id); | |
cc192b50 | 988 | #if USE_IPV6 |
989 | if(q->query.qtype == RFC1035_TYPE_AAAA) { | |
990 | debugs(78, 3, "idnsGrokReply: Trying AAAA Query for " << q->name); | |
991 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
992 | } | |
993 | else | |
994 | #endif | |
995 | { | |
996 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
997 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
998 | } | |
68836b58 | 999 | idnsCacheQuery(q); |
1000 | idnsSendQuery(q); | |
1001 | return; | |
1002 | } | |
558be27a | 1003 | } |
62e76326 | 1004 | |
cc192b50 | 1005 | #if USE_IPV6 |
1006 | if(q->need_A && (Config.onoff.dns_require_A == 1 || n <= 0 ) ) | |
1007 | { | |
1008 | /* ERROR or NO AAAA exist. Failover to A records. */ | |
bae9832d | 1009 | /* Apparently its also a good idea to lookup and store the A records |
cc192b50 | 1010 | * just in case the AAAA are not available when we need them. |
1011 | * This could occur due to number of network failings beyond our control | |
1012 | * thus the || above allowing the user to request always both. | |
1013 | */ | |
1014 | ||
1015 | if(n == 0) | |
1016 | debugs(78, 3, "idnsGrokReply: " << q->name << " has no AAAA records. Looking up A record instead."); | |
1017 | else if(q->need_A && n <= 0) | |
1018 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query failed. Trying A now instead."); | |
1019 | else // admin requested this. | |
1020 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query done. Configured to retrieve A now also."); | |
1021 | ||
bae9832d | 1022 | // move the initial message results into the failover query for merging later. |
1023 | if(n > 0) { | |
1024 | q->initial_AAAA.count = message->ancount; | |
1025 | q->initial_AAAA.answers = message->answer; | |
1026 | message->answer = NULL; | |
1027 | } | |
1028 | ||
1029 | // remove the hashed query info | |
cc192b50 | 1030 | idnsDropMessage(message, q); |
1031 | ||
1032 | q->start_t = current_time; | |
1033 | q->id = idnsQueryID(); | |
1034 | rfc1035SetQueryID(q->buf, q->id); | |
1035 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1036 | q->need_A = false; | |
1037 | idnsCacheQuery(q); | |
1038 | idnsSendQuery(q); | |
1039 | return; | |
1040 | } | |
1041 | #endif | |
1042 | ||
bae9832d | 1043 | /** If there are two result sets from preceeding AAAA and A lookups merge them with a preference for AAAA */ |
1044 | if(q->initial_AAAA.count > 0 && n > 0) { | |
1045 | /* two sets of RR need merging */ | |
1046 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q->initial_AAAA.count) ); | |
1047 | rfc1035_rr *tmp = result; | |
1048 | ||
1049 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1050 | ||
1051 | memcpy(tmp, q->initial_AAAA.answers, (sizeof(rfc1035_rr)*(q->initial_AAAA.count)) ); | |
1052 | tmp += q->initial_AAAA.count; | |
1053 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1054 | safe_free(q->initial_AAAA.answers); | |
1055 | ||
1056 | memcpy( tmp, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1057 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1058 | safe_free(message->answer); | |
1059 | ||
1060 | message->answer = result; | |
1061 | n += q->initial_AAAA.count; | |
1062 | q->initial_AAAA.count=0; | |
1063 | } | |
1064 | else if(q->initial_AAAA.count > 0 && n <= 0) { | |
1065 | /* initial of dual queries was the only result set. */ | |
1066 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1067 | rfc1035RRDestroy(&(message->answer), n); | |
1068 | message->answer = q->initial_AAAA.answers; | |
1069 | n = q->initial_AAAA.count; | |
1070 | } | |
1071 | /* else initial results were empty. just use the final set as authoritative */ | |
1072 | ||
1073 | debugs(78, 6, HERE << "Sending " << n << " DNS results to caller."); | |
ec7bade0 | 1074 | idnsCallback(q, message->answer, n, q->error); |
cc192b50 | 1075 | rfc1035MessageDestroy(&message); |
63a0e6b7 | 1076 | cbdataFree(q); |
7b724b86 | 1077 | } |
1078 | ||
1079 | static void | |
1080 | idnsRead(int fd, void *data) | |
1081 | { | |
d193a436 | 1082 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1083 | int len; |
42b51993 | 1084 | int max = INCOMING_DNS_MAX; |
d29b40de | 1085 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
7cfc1c9a | 1086 | int ns; |
cc192b50 | 1087 | IPAddress from; |
1088 | ||
d7e7eaa7 | 1089 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1090 | |
1091 | /* BUG (UNRESOLVED) | |
1092 | * two code lines after returning from comm_udprecvfrom() | |
1093 | * something overwrites the memory behind the from parameter. | |
1094 | * NO matter where in the stack declaration list above it is placed | |
1095 | * The cause of this is still unknown, however copying the data appears | |
1096 | * to allow it to be passed further without this erasure. | |
1097 | */ | |
1098 | IPAddress bugbypass; | |
62e76326 | 1099 | |
7b724b86 | 1100 | while (max--) { |
cc192b50 | 1101 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1102 | |
cc192b50 | 1103 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1104 | |
1105 | if (len == 0) | |
1106 | break; | |
1107 | ||
1108 | if (len < 0) { | |
1109 | if (ignoreErrno(errno)) | |
1110 | break; | |
1111 | ||
7b724b86 | 1112 | #ifdef _SQUID_LINUX_ |
62e76326 | 1113 | /* Some Linux systems seem to set the FD for reading and then |
1114 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1115 | * port unreachable message. */ | |
1116 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1117 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1118 | #endif |
62e76326 | 1119 | |
bf8fe701 | 1120 | debugs(50, 1, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1121 | |
1122 | break; | |
1123 | } | |
1124 | ||
1125 | fd_bytes(DnsSocket, len, FD_READ); | |
1126 | assert(N); | |
1127 | (*N)++; | |
cc192b50 | 1128 | |
1129 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1130 | ||
1131 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
1132 | ns = idnsFromKnownNameserver(from); | |
62e76326 | 1133 | |
1134 | if (ns >= 0) { | |
1135 | nameservers[ns].nreplies++; | |
1136 | } else if (Config.onoff.ignore_unknown_nameservers) { | |
1137 | static time_t last_warning = 0; | |
1138 | ||
1139 | if (squid_curtime - last_warning > 60) { | |
cc192b50 | 1140 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1141 | last_warning = squid_curtime; |
1142 | } | |
cc192b50 | 1143 | else { |
1144 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); | |
2fadd50d | 1145 | } continue; |
62e76326 | 1146 | } |
1147 | ||
62e76326 | 1148 | idnsGrokReply(rbuf, len); |
7b724b86 | 1149 | } |
62e76326 | 1150 | |
2e6caa54 | 1151 | if (lru_list.head) |
62e76326 | 1152 | commSetSelect(DnsSocket, COMM_SELECT_READ, idnsRead, NULL, 0); |
7b724b86 | 1153 | } |
1154 | ||
7cfc1c9a | 1155 | static void |
1156 | idnsCheckQueue(void *unused) | |
1157 | { | |
1158 | dlink_node *n; | |
0c4fe9e4 | 1159 | dlink_node *p = NULL; |
7cfc1c9a | 1160 | idns_query *q; |
1161 | event_queued = 0; | |
62e76326 | 1162 | |
0c4fe9e4 | 1163 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1164 | if (0 == nns) |
1165 | /* name servers went away; reconfiguring or shutting down */ | |
1166 | break; | |
1167 | ||
1168 | q = (idns_query *)n->data; | |
1169 | ||
da0c4437 | 1170 | if (tvSubDsec(q->sent_t, current_time) < Config.Timeout.idns_retransmit * (1 << (q->nsends - 1) % nns)) |
62e76326 | 1171 | break; |
1172 | ||
bf8fe701 | 1173 | debugs(78, 3, "idnsCheckQueue: ID 0x" << std::hex << std::setfill('0') << std::setw(4) << q->id << "timeout" ); |
62e76326 | 1174 | |
1175 | p = n->prev; | |
1176 | ||
1177 | dlinkDelete(&q->lru, &lru_list); | |
1178 | ||
1179 | if (tvSubDsec(q->start_t, current_time) < Config.Timeout.idns_query) { | |
1180 | idnsSendQuery(q); | |
1181 | } else { | |
4a7a3d56 | 1182 | debugs(78, 2, "idnsCheckQueue: ID " << std::hex << q->id << |
bf8fe701 | 1183 | ": giving up after " << std::dec << q->nsends << " tries and " << |
1184 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); | |
3074b9d1 | 1185 | |
1186 | if (q->rcode != 0) | |
1187 | idnsCallback(q, NULL, -q->rcode, q->error); | |
1188 | else | |
1189 | idnsCallback(q, NULL, -16, "Timeout"); | |
62e76326 | 1190 | |
63a0e6b7 | 1191 | cbdataFree(q); |
62e76326 | 1192 | } |
7cfc1c9a | 1193 | } |
62e76326 | 1194 | |
efd900cb | 1195 | idnsTickleQueue(); |
7cfc1c9a | 1196 | } |
1197 | ||
d24ef4e9 | 1198 | static void |
1199 | idnsReadVC(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) | |
1200 | { | |
1201 | nsvc * vc = (nsvc *)data; | |
1202 | ||
1203 | if (flag == COMM_ERR_CLOSING) | |
1204 | return; | |
1205 | ||
1206 | if (flag != COMM_OK || len <= 0) { | |
1207 | comm_close(fd); | |
1208 | return; | |
1209 | } | |
1210 | ||
032785bf | 1211 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1212 | |
032785bf | 1213 | if (vc->msg->contentSize() < vc->msglen) { |
1214 | comm_read(fd, buf + len, vc->msglen - vc->msg->contentSize(), idnsReadVC, vc); | |
d24ef4e9 | 1215 | return; |
1216 | } | |
1217 | ||
bf8fe701 | 1218 | debugs(78, 3, "idnsReadVC: FD " << fd << ": received " << |
1219 | (int) vc->msg->contentSize() << " bytes via tcp from " << | |
cc192b50 | 1220 | nameservers[vc->ns].S << "."); |
d24ef4e9 | 1221 | |
032785bf | 1222 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize()); |
2fe7eff9 | 1223 | vc->msg->clean(); |
d24ef4e9 | 1224 | comm_read(fd, (char *)&vc->msglen, 2 , idnsReadVCHeader, vc); |
1225 | } | |
1226 | ||
1227 | static void | |
1228 | idnsReadVCHeader(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) | |
1229 | { | |
1230 | nsvc * vc = (nsvc *)data; | |
1231 | ||
1232 | if (flag == COMM_ERR_CLOSING) | |
1233 | return; | |
1234 | ||
1235 | if (flag != COMM_OK || len <= 0) { | |
1236 | comm_close(fd); | |
1237 | return; | |
1238 | } | |
1239 | ||
1240 | vc->read_msglen += len; | |
1241 | ||
1242 | assert(vc->read_msglen <= 2); | |
1243 | ||
1244 | if (vc->read_msglen < 2) { | |
1245 | comm_read(fd, buf + len, 2 - vc->read_msglen, idnsReadVCHeader, vc); | |
1246 | return; | |
1247 | } | |
1248 | ||
1249 | vc->read_msglen = 0; | |
1250 | ||
1251 | vc->msglen = ntohs(vc->msglen); | |
1252 | ||
2fe7eff9 | 1253 | vc->msg->init(vc->msglen, vc->msglen); |
032785bf | 1254 | comm_read(fd, vc->msg->buf, vc->msglen, idnsReadVC, vc); |
d24ef4e9 | 1255 | } |
1256 | ||
558be27a | 1257 | /* |
1258 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1259 | */ | |
1260 | static void | |
1261 | idnsRcodeCount(int rcode, int attempt) | |
1262 | { | |
1263 | if (rcode > 0) | |
62e76326 | 1264 | rcode = 0; |
558be27a | 1265 | else if (rcode < 0) |
62e76326 | 1266 | rcode = -rcode; |
1267 | ||
558be27a | 1268 | if (rcode < MAX_RCODE) |
62e76326 | 1269 | if (attempt < MAX_ATTEMPT) |
1270 | RcodeMatrix[rcode][attempt]++; | |
558be27a | 1271 | } |
1272 | ||
7b724b86 | 1273 | /* ====================================================================== */ |
1274 | ||
1275 | void | |
1276 | idnsInit(void) | |
1277 | { | |
1278 | static int init = 0; | |
62e76326 | 1279 | |
d24ef4e9 | 1280 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1281 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1282 | |
ef523f99 | 1283 | if (DnsSocket < 0) { |
62e76326 | 1284 | int port; |
1285 | ||
cc192b50 | 1286 | IPAddress addr; |
62e76326 | 1287 | |
cc192b50 | 1288 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
62e76326 | 1289 | addr = Config.Addrs.udp_outgoing; |
1290 | else | |
1291 | addr = Config.Addrs.udp_incoming; | |
1292 | ||
1293 | DnsSocket = comm_open(SOCK_DGRAM, | |
bdb741f4 | 1294 | IPPROTO_UDP, |
62e76326 | 1295 | addr, |
62e76326 | 1296 | COMM_NONBLOCKING, |
1297 | "DNS Socket"); | |
1298 | ||
cc192b50 | 1299 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addr); |
1300 | ||
62e76326 | 1301 | if (DnsSocket < 0) |
1302 | fatal("Could not create a DNS socket"); | |
1303 | ||
1304 | /* Ouch... we can't call functions using debug from a debug | |
1305 | * statement. Doing so messes up the internal Debug::level | |
1306 | */ | |
1307 | port = comm_local_port(DnsSocket); | |
1308 | ||
cc192b50 | 1309 | debugs(78, 1, "DNS Socket created at " << addr << ", FD " << DnsSocket); |
7b724b86 | 1310 | } |
62e76326 | 1311 | |
efd900cb | 1312 | assert(0 == nns); |
1313 | idnsParseNameservers(); | |
0e6d05ef | 1314 | #ifndef _SQUID_MSWIN_ |
62e76326 | 1315 | |
efd900cb | 1316 | if (0 == nns) |
62e76326 | 1317 | idnsParseResolvConf(); |
1318 | ||
0e6d05ef | 1319 | #endif |
ec4daaa5 | 1320 | #ifdef _SQUID_WIN32_ |
62e76326 | 1321 | |
0e6d05ef | 1322 | if (0 == nns) |
62e76326 | 1323 | idnsParseWIN32Registry(); |
1324 | ||
0e6d05ef | 1325 | #endif |
62e76326 | 1326 | |
29fe9bd5 | 1327 | if (0 == nns) { |
1328 | debugs(78, 1, "Warning: Could not find any nameservers. Trying to use localhost"); | |
ec4daaa5 | 1329 | #ifdef _SQUID_WIN32_ |
29fe9bd5 | 1330 | |
1331 | debugs(78, 1, "Please check your TCP-IP settings or /etc/resolv.conf file"); | |
0e6d05ef | 1332 | #else |
29fe9bd5 | 1333 | |
1334 | debugs(78, 1, "Please check your /etc/resolv.conf file"); | |
0e6d05ef | 1335 | #endif |
29fe9bd5 | 1336 | |
1337 | debugs(78, 1, "or use the 'dns_nameservers' option in squid.conf."); | |
1338 | idnsAddNameserver("127.0.0.1"); | |
1339 | } | |
62e76326 | 1340 | |
7b724b86 | 1341 | if (!init) { |
62e76326 | 1342 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1343 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1344 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
62e76326 | 1345 | init++; |
7b724b86 | 1346 | } |
7b724b86 | 1347 | } |
1348 | ||
62ee09ca | 1349 | void |
1350 | idnsRegisterWithCacheManager(CacheManager & manager) | |
1351 | { | |
1352 | manager.registerAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); | |
1353 | } | |
1354 | ||
7b724b86 | 1355 | void |
1356 | idnsShutdown(void) | |
1357 | { | |
ef523f99 | 1358 | if (DnsSocket < 0) |
62e76326 | 1359 | return; |
1360 | ||
ef523f99 | 1361 | comm_close(DnsSocket); |
62e76326 | 1362 | |
ef523f99 | 1363 | DnsSocket = -1; |
62e76326 | 1364 | |
b26754c4 | 1365 | for (int i = 0; i < nns; i++) { |
1366 | if (nsvc *vc = nameservers[i].vc) { | |
1367 | if (vc->fd >= 0) | |
1368 | comm_close(vc->fd); | |
1369 | } | |
1370 | } | |
1371 | ||
efd900cb | 1372 | idnsFreeNameservers(); |
68836b58 | 1373 | |
1374 | idnsFreeSearchpath(); | |
7b724b86 | 1375 | } |
1376 | ||
3074b9d1 | 1377 | static int |
1378 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1379 | { | |
1380 | idns_query *q; | |
1381 | ||
1382 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1383 | ||
1384 | if (!old) | |
1385 | return 0; | |
1386 | ||
63a0e6b7 | 1387 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1388 | |
1389 | q->callback = callback; | |
1390 | ||
1391 | q->callback_data = cbdataReference(data); | |
1392 | ||
1393 | q->queue = old->queue; | |
1394 | ||
1395 | old->queue = q; | |
1396 | ||
1397 | return 1; | |
1398 | } | |
1399 | ||
1400 | static void | |
9e1f210d | 1401 | idnsCacheQuery(idns_query *q) |
3074b9d1 | 1402 | { |
9e1f210d | 1403 | q->hash.key = q->query.name; |
3074b9d1 | 1404 | hash_join(idns_lookup_hash, &q->hash); |
1405 | } | |
1406 | ||
7b724b86 | 1407 | void |
1408 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1409 | { | |
68836b58 | 1410 | unsigned int i; |
1411 | int nd = 0; | |
3074b9d1 | 1412 | idns_query *q; |
1413 | ||
1414 | if (idnsCachedLookup(name, callback, data)) | |
1415 | return; | |
1416 | ||
63a0e6b7 | 1417 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1418 | |
71952967 | 1419 | q->id = idnsQueryID(); |
1420 | ||
68836b58 | 1421 | for (i = 0; i < strlen(name); i++) |
1422 | if (name[i] == '.') | |
1423 | nd++; | |
1424 | ||
1425 | if (Config.onoff.res_defnames && npc > 0 && name[strlen(name)-1] != '.') { | |
1426 | q->do_searchpath = 1; | |
1427 | } else { | |
1428 | q->do_searchpath = 0; | |
1429 | } | |
1430 | ||
1431 | strcpy(q->orig, name); | |
1432 | strcpy(q->name, q->orig); | |
1433 | ||
1434 | if (q->do_searchpath && nd < ndots) { | |
1435 | q->domain = 0; | |
1436 | strcat(q->name, "."); | |
1437 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1438 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1439 | } |
1440 | ||
cc192b50 | 1441 | #if USE_IPV6 |
1442 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1443 | q->need_A = true; | |
1444 | #else | |
1445 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1446 | q->need_A = false; | |
1447 | #endif | |
62e76326 | 1448 | |
2041330b | 1449 | if (q->sz < 0) { |
1450 | /* problem with query data -- query not sent */ | |
1451 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1452 | cbdataFree(q); |
2041330b | 1453 | return; |
1454 | } | |
1455 | ||
4a7a3d56 | 1456 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
bf8fe701 | 1457 | ", id = 0x" << std::hex << q->id); |
aa6c61e3 | 1458 | |
7b724b86 | 1459 | q->callback = callback; |
aa6c61e3 | 1460 | |
fa80a8ef | 1461 | q->callback_data = cbdataReference(data); |
aa6c61e3 | 1462 | |
7cfc1c9a | 1463 | q->start_t = current_time; |
aa6c61e3 | 1464 | |
9e1f210d | 1465 | idnsCacheQuery(q); |
aa6c61e3 | 1466 | |
7b724b86 | 1467 | idnsSendQuery(q); |
1468 | } | |
8db71107 | 1469 | |
1470 | void | |
cc192b50 | 1471 | idnsPTRLookup(const IPAddress &addr, IDNSCB * callback, void *data) |
8db71107 | 1472 | { |
3074b9d1 | 1473 | idns_query *q; |
1474 | ||
cc192b50 | 1475 | char ip[MAX_IPSTRLEN]; |
1476 | ||
1477 | addr.NtoA(ip,MAX_IPSTRLEN); | |
3074b9d1 | 1478 | |
63a0e6b7 | 1479 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1480 | |
71952967 | 1481 | q->id = idnsQueryID(); |
1482 | ||
cc192b50 | 1483 | #if USE_IPV6 |
1484 | if( addr.IsIPv6() ) { | |
1485 | struct in6_addr addr6; | |
1486 | addr.GetInAddr(addr6); | |
1487 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->id, &q->query); | |
1488 | } | |
1489 | else | |
1490 | #endif | |
1491 | { | |
1492 | struct in_addr addr4; | |
1493 | addr.GetInAddr(addr4); | |
1494 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->id, &q->query); | |
1495 | } | |
1496 | ||
1497 | /* PTR does not do inbound A/AAAA */ | |
1498 | q->need_A = false; | |
3074b9d1 | 1499 | |
2041330b | 1500 | if (q->sz < 0) |
1501 | { | |
1502 | /* problem with query data -- query not sent */ | |
1503 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1504 | cbdataFree(q); |
2041330b | 1505 | return; |
1506 | } | |
1507 | ||
37f3da43 | 1508 | if (idnsCachedLookup(q->query.name, callback, data)) { |
1509 | cbdataFree(q); | |
1510 | return; | |
1511 | } | |
1512 | ||
4a7a3d56 | 1513 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
bf8fe701 | 1514 | ", id = 0x" << std::hex << q->id); |
3074b9d1 | 1515 | |
8db71107 | 1516 | q->callback = callback; |
3074b9d1 | 1517 | |
fa80a8ef | 1518 | q->callback_data = cbdataReference(data); |
3074b9d1 | 1519 | |
8db71107 | 1520 | q->start_t = current_time; |
3074b9d1 | 1521 | |
9e1f210d | 1522 | idnsCacheQuery(q); |
3074b9d1 | 1523 | |
8db71107 | 1524 | idnsSendQuery(q); |
1525 | } | |
eb824054 | 1526 | |
3c573763 | 1527 | #ifdef SQUID_SNMP |
1528 | /* | |
1529 | * The function to return the DNS via SNMP | |
1530 | */ | |
1531 | variable_list * | |
1532 | snmp_netIdnsFn(variable_list * Var, snint * ErrP) | |
1533 | { | |
1534 | int i, n = 0; | |
1535 | variable_list *Answer = NULL; | |
bf8fe701 | 1536 | debugs(49, 5, "snmp_netDnsFn: Processing request: "); |
3c573763 | 1537 | snmpDebugOid(5, Var->name, Var->name_length); |
1538 | *ErrP = SNMP_ERR_NOERROR; | |
62e76326 | 1539 | |
3c573763 | 1540 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1541 | |
3c573763 | 1542 | case DNS_REQ: |
62e76326 | 1543 | |
1544 | for (i = 0; i < nns; i++) | |
1545 | n += nameservers[i].nqueries; | |
1546 | ||
1547 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1548 | n, | |
1549 | SMI_COUNTER32); | |
1550 | ||
1551 | break; | |
1552 | ||
3c573763 | 1553 | case DNS_REP: |
62e76326 | 1554 | for (i = 0; i < nns; i++) |
1555 | n += nameservers[i].nreplies; | |
1556 | ||
1557 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1558 | n, | |
1559 | SMI_COUNTER32); | |
1560 | ||
1561 | break; | |
1562 | ||
3c573763 | 1563 | case DNS_SERVERS: |
62e76326 | 1564 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1565 | nns, |
62e76326 | 1566 | SMI_COUNTER32); |
1567 | ||
1568 | break; | |
1569 | ||
3c573763 | 1570 | default: |
62e76326 | 1571 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1572 | ||
1573 | break; | |
3c573763 | 1574 | } |
62e76326 | 1575 | |
3c573763 | 1576 | return Answer; |
1577 | } | |
62e76326 | 1578 | |
3c573763 | 1579 | #endif /*SQUID_SNMP */ |
1f1ae50a | 1580 | #endif /* USE_DNSSERVERS */ |