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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; |
108 | struct timeval sent_t; | |
820ee9fa | 109 | struct timeval queue_t; |
58a39dc9 | 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]; |
a083e75a | 293 | const 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); |
a083e75a HN |
320 | } else if (strcasecmp(t, "domain") == 0) { |
321 | idnsFreeSearchpath(); | |
322 | t = strtok(NULL, w_space); | |
323 | ||
324 | if (NULL == t) | |
325 | continue; | |
326 | ||
327 | debugs(78, 1, "Adding domain " << t << " from " << _PATH_RESCONF); | |
328 | ||
329 | idnsAddPathComponent(t); | |
68836b58 | 330 | } else if (strcasecmp(t, "search") == 0) { |
a083e75a | 331 | idnsFreeSearchpath(); |
68836b58 | 332 | while (NULL != t) { |
333 | t = strtok(NULL, w_space); | |
334 | ||
335 | if (NULL == t) | |
336 | continue; | |
337 | ||
bf8fe701 | 338 | debugs(78, 1, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 339 | |
340 | idnsAddPathComponent(t); | |
341 | } | |
342 | } else if (strcasecmp(t, "options") == 0) { | |
343 | while (NULL != t) { | |
344 | t = strtok(NULL, w_space); | |
62e76326 | 345 | |
68836b58 | 346 | if (NULL == t) |
347 | continue; | |
62e76326 | 348 | |
68836b58 | 349 | if (strncmp(t, "ndots:", 6) != 0) { |
350 | ndots = atoi(t + 6); | |
351 | ||
352 | if (ndots < 1) | |
353 | ndots = 1; | |
354 | ||
bf8fe701 | 355 | debugs(78, 1, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 356 | } |
357 | } | |
358 | } | |
7b724b86 | 359 | } |
a083e75a HN |
360 | if (npc == 0 && (t = getMyHostname())) { |
361 | t = strchr(t, '.'); | |
362 | if (t) | |
363 | idnsAddPathComponent(t+1); | |
364 | } | |
62e76326 | 365 | |
7b724b86 | 366 | fclose(fp); |
367 | } | |
368 | ||
1f1ae50a | 369 | #endif |
370 | ||
ec4daaa5 | 371 | #ifdef _SQUID_WIN32_ |
6b610e34 | 372 | static void |
d02b72b4 | 373 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 374 | { |
a16cb11f | 375 | char *t; |
6b610e34 | 376 | char *token; |
377 | HKEY hndKey; | |
378 | ||
379 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
380 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters", | |
381 | &hndKey) == ERROR_SUCCESS) { | |
382 | DWORD Type = 0; | |
383 | DWORD Size = 0; | |
384 | LONG Result; | |
a16cb11f GS |
385 | Result = |
386 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, | |
387 | &Size); | |
388 | ||
389 | if (Result == ERROR_SUCCESS && Size) { | |
390 | t = (char *) xmalloc(Size); | |
391 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, | |
392 | &Size); | |
a6cae565 | 393 | debugs(78, 1, "Adding domain " << t << " from Registry"); |
a16cb11f GS |
394 | idnsAddPathComponent(t); |
395 | xfree(t); | |
396 | } | |
6b610e34 | 397 | Result = |
398 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, | |
399 | &Size); | |
400 | ||
401 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f GS |
402 | t = (char *) xmalloc(Size); |
403 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, | |
6b610e34 | 404 | &Size); |
a16cb11f | 405 | token = strtok(t, Separator); |
6b610e34 | 406 | |
407 | while (token) { | |
408 | idnsAddPathComponent(token); | |
409 | debugs(78, 1, "Adding domain " << token << " from Registry"); | |
410 | token = strtok(NULL, Separator); | |
411 | } | |
a16cb11f | 412 | xfree(t); |
6b610e34 | 413 | } |
414 | ||
415 | RegCloseKey(hndKey); | |
416 | } | |
a6cae565 | 417 | if (npc == 0 && (t = (char *) getMyHostname())) { |
a16cb11f GS |
418 | t = strchr(t, '.'); |
419 | if (t) | |
420 | idnsAddPathComponent(t + 1); | |
421 | } | |
6b610e34 | 422 | } |
423 | ||
0e6d05ef | 424 | static void |
425 | idnsParseWIN32Registry(void) | |
426 | { | |
a16cb11f | 427 | char *t; |
0e6d05ef | 428 | char *token; |
429 | HKEY hndKey, hndKey2; | |
430 | ||
0e6d05ef | 431 | switch (WIN32_OS_version) { |
62e76326 | 432 | |
0e6d05ef | 433 | case _WIN_OS_WINNT: |
62e76326 | 434 | /* get nameservers from the Windows NT registry */ |
435 | ||
436 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
437 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters", | |
438 | &hndKey) == ERROR_SUCCESS) { | |
439 | DWORD Type = 0; | |
440 | DWORD Size = 0; | |
441 | LONG Result; | |
442 | Result = | |
443 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, | |
444 | &Size); | |
445 | ||
446 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 447 | t = (char *) xmalloc(Size); |
a6cae565 | 448 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, |
62e76326 | 449 | &Size); |
a16cb11f | 450 | token = strtok(t, ", "); |
62e76326 | 451 | |
452 | while (token) { | |
453 | idnsAddNameserver(token); | |
6b610e34 | 454 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
455 | token = strtok(NULL, ","); | |
62e76326 | 456 | } |
a16cb11f | 457 | xfree(t); |
62e76326 | 458 | } |
459 | ||
460 | Result = | |
461 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); | |
462 | ||
463 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 464 | t = (char *) xmalloc(Size); |
a6cae565 | 465 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 466 | token = strtok(t, ", "); |
62e76326 | 467 | |
468 | while (token) { | |
6b610e34 | 469 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 470 | idnsAddNameserver(token); |
471 | token = strtok(NULL, ", "); | |
472 | } | |
a16cb11f | 473 | xfree(t); |
62e76326 | 474 | } |
475 | ||
476 | RegCloseKey(hndKey); | |
477 | } | |
478 | ||
6b610e34 | 479 | idnsParseWIN32SearchList(" "); |
480 | ||
62e76326 | 481 | break; |
482 | ||
0e6d05ef | 483 | case _WIN_OS_WIN2K: |
62e76326 | 484 | |
b671cc68 | 485 | case _WIN_OS_WINXP: |
62e76326 | 486 | |
6b1846cf | 487 | case _WIN_OS_WINNET: |
28170269 | 488 | |
489 | case _WIN_OS_WINLON: | |
62e76326 | 490 | /* get nameservers from the Windows 2000 registry */ |
491 | /* search all interfaces for DNS server addresses */ | |
492 | ||
493 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
494 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces", | |
495 | &hndKey) == ERROR_SUCCESS) { | |
496 | int i; | |
497 | char keyname[255]; | |
498 | ||
499 | for (i = 0; i < 10; i++) { | |
500 | if (RegEnumKey(hndKey, i, (char *) &keyname, | |
501 | 255) == ERROR_SUCCESS) { | |
502 | char newkeyname[255]; | |
503 | strcpy(newkeyname, | |
504 | "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces\\"); | |
505 | strcat(newkeyname, keyname); | |
506 | ||
507 | if (RegOpenKey(HKEY_LOCAL_MACHINE, newkeyname, | |
508 | &hndKey2) == ERROR_SUCCESS) { | |
509 | DWORD Type = 0; | |
510 | DWORD Size = 0; | |
511 | LONG Result; | |
512 | Result = | |
513 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, | |
514 | &Type, NULL, &Size); | |
515 | ||
516 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 517 | t = (char *) xmalloc(Size); |
62e76326 | 518 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, |
a6cae565 | 519 | &Type, (LPBYTE) t, &Size); |
a16cb11f | 520 | token = strtok(t, ", "); |
62e76326 | 521 | |
522 | while (token) { | |
6b610e34 | 523 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
62e76326 | 524 | idnsAddNameserver(token); |
525 | token = strtok(NULL, ", "); | |
526 | } | |
a16cb11f | 527 | xfree(t); |
62e76326 | 528 | } |
529 | ||
530 | Result = | |
531 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, | |
532 | NULL, &Size); | |
533 | ||
534 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 535 | t = (char *) xmalloc(Size); |
62e76326 | 536 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, |
a6cae565 | 537 | (LPBYTE) t, &Size); |
a16cb11f | 538 | token = strtok(t, ", "); |
62e76326 | 539 | |
540 | while (token) { | |
6b610e34 | 541 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 542 | idnsAddNameserver(token); |
543 | token = strtok(NULL, ", "); | |
544 | } | |
a16cb11f | 545 | xfree(t); |
62e76326 | 546 | } |
547 | ||
548 | RegCloseKey(hndKey2); | |
549 | } | |
550 | } | |
551 | } | |
552 | ||
553 | RegCloseKey(hndKey); | |
554 | } | |
555 | ||
6b610e34 | 556 | idnsParseWIN32SearchList(", "); |
557 | ||
62e76326 | 558 | break; |
559 | ||
0e6d05ef | 560 | case _WIN_OS_WIN95: |
62e76326 | 561 | |
0e6d05ef | 562 | case _WIN_OS_WIN98: |
62e76326 | 563 | |
be20dac7 | 564 | case _WIN_OS_WINME: |
62e76326 | 565 | /* get nameservers from the Windows 9X registry */ |
566 | ||
567 | if (RegOpenKey(HKEY_LOCAL_MACHINE, | |
568 | "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP", | |
569 | &hndKey) == ERROR_SUCCESS) { | |
570 | DWORD Type = 0; | |
571 | DWORD Size = 0; | |
572 | LONG Result; | |
573 | Result = | |
574 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); | |
575 | ||
576 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 577 | t = (char *) xmalloc(Size); |
a6cae565 | 578 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 579 | token = strtok(t, ", "); |
62e76326 | 580 | |
581 | while (token) { | |
6b610e34 | 582 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 583 | idnsAddNameserver(token); |
584 | token = strtok(NULL, ", "); | |
585 | } | |
a16cb11f | 586 | xfree(t); |
62e76326 | 587 | } |
588 | ||
589 | RegCloseKey(hndKey); | |
590 | } | |
591 | ||
592 | break; | |
593 | ||
0e6d05ef | 594 | default: |
6b610e34 | 595 | debugs(78, 1, "Failed to read nameserver from Registry: Unknown System Type."); |
62e76326 | 596 | return; |
0e6d05ef | 597 | } |
598 | } | |
62e76326 | 599 | |
0e6d05ef | 600 | #endif |
601 | ||
7b724b86 | 602 | static void |
603 | idnsStats(StoreEntry * sentry) | |
604 | { | |
a16b4aa0 | 605 | dlink_node *n; |
606 | idns_query *q; | |
7cfc1c9a | 607 | int i; |
558be27a | 608 | int j; |
cc192b50 | 609 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 610 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 611 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 612 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
613 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND\n"); | |
614 | storeAppendPrintf(sentry, "------ ---- ----- ---------- ---------\n"); | |
62e76326 | 615 | |
a16b4aa0 | 616 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 617 | q = (idns_query *)n->data; |
618 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f\n", | |
619 | (int) q->id, (int) q->sz, q->nsends, | |
620 | tvSubDsec(q->start_t, current_time), | |
621 | tvSubDsec(q->sent_t, current_time)); | |
7cfc1c9a | 622 | } |
62e76326 | 623 | |
7cfc1c9a | 624 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
cc192b50 | 625 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES\n"); |
626 | storeAppendPrintf(sentry, "---------------------------------------------- --------- ---------\n"); | |
62e76326 | 627 | |
7cfc1c9a | 628 | for (i = 0; i < nns; i++) { |
cc192b50 | 629 | storeAppendPrintf(sentry, "%-45s %9d %9d\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
630 | nameservers[i].S.NtoA(buf,MAX_IPSTRLEN), | |
62e76326 | 631 | nameservers[i].nqueries, |
632 | nameservers[i].nreplies); | |
a16b4aa0 | 633 | } |
62e76326 | 634 | |
558be27a | 635 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
636 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 637 | |
558be27a | 638 | for (i = 0; i < MAX_ATTEMPT; i++) |
62e76326 | 639 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
640 | ||
7928b8df | 641 | storeAppendPrintf(sentry, "\n"); |
62e76326 | 642 | |
558be27a | 643 | for (j = 0; j < MAX_RCODE; j++) { |
62e76326 | 644 | storeAppendPrintf(sentry, "%5d", j); |
645 | ||
646 | for (i = 0; i < MAX_ATTEMPT; i++) | |
647 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); | |
648 | ||
649 | storeAppendPrintf(sentry, "\n"); | |
558be27a | 650 | } |
6b610e34 | 651 | |
652 | if (npc) { | |
653 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
654 | ||
655 | for (i=0; i < npc; i++) | |
656 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); | |
657 | ||
658 | storeAppendPrintf(sentry, "\n"); | |
659 | } | |
7b724b86 | 660 | } |
661 | ||
efd900cb | 662 | static void |
663 | idnsTickleQueue(void) | |
664 | { | |
665 | if (event_queued) | |
62e76326 | 666 | return; |
667 | ||
efd900cb | 668 | if (NULL == lru_list.tail) |
62e76326 | 669 | return; |
670 | ||
efd900cb | 671 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, 1.0, 1); |
62e76326 | 672 | |
efd900cb | 673 | event_queued = 1; |
674 | } | |
675 | ||
d24ef4e9 | 676 | static void |
2b663917 | 677 | idnsSentQueryVC(int fd, char *buf, size_t size, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 678 | { |
679 | nsvc * vc = (nsvc *)data; | |
680 | ||
681 | if (flag == COMM_ERR_CLOSING) | |
682 | return; | |
683 | ||
684 | if (flag != COMM_OK || size <= 0) { | |
685 | comm_close(fd); | |
686 | return; | |
687 | } | |
688 | ||
689 | vc->busy = 0; | |
690 | idnsDoSendQueryVC(vc); | |
691 | } | |
692 | ||
693 | static void | |
694 | idnsDoSendQueryVC(nsvc *vc) | |
695 | { | |
696 | if (vc->busy) | |
697 | return; | |
698 | ||
032785bf | 699 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 700 | return; |
701 | ||
032785bf | 702 | MemBuf *mb = vc->queue; |
d24ef4e9 | 703 | |
032785bf | 704 | vc->queue = new MemBuf; |
d24ef4e9 | 705 | |
706 | vc->busy = 1; | |
707 | ||
708 | commSetTimeout(vc->fd, Config.Timeout.idns_query, NULL, NULL); | |
709 | ||
2b663917 | 710 | comm_write_mbuf(vc->fd, mb, idnsSentQueryVC, vc); |
032785bf | 711 | |
712 | delete mb; | |
d24ef4e9 | 713 | } |
714 | ||
715 | static void | |
716 | idnsInitVCConnected(int fd, comm_err_t status, int xerrno, void *data) | |
717 | { | |
718 | nsvc * vc = (nsvc *)data; | |
719 | ||
720 | if (status != COMM_OK) { | |
445962f3 HN |
721 | char buf[MAX_IPSTRLEN]; |
722 | debugs(78, 1, "idnsInitVCConnected: Failed to connect to nameserver " << nameservers[vc->ns].S.NtoA(buf,MAX_IPSTRLEN) << " using TCP!"); | |
d24ef4e9 | 723 | comm_close(fd); |
724 | return; | |
725 | } | |
726 | ||
727 | comm_read(fd, (char *)&vc->msglen, 2 , idnsReadVCHeader, vc); | |
728 | vc->busy = 0; | |
729 | idnsDoSendQueryVC(vc); | |
730 | } | |
731 | ||
732 | static void | |
733 | idnsVCClosed(int fd, void *data) | |
734 | { | |
735 | nsvc * vc = (nsvc *)data; | |
032785bf | 736 | delete vc->queue; |
737 | delete vc->msg; | |
d24ef4e9 | 738 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 739 | cbdataFree(vc); |
d24ef4e9 | 740 | } |
741 | ||
742 | static void | |
743 | idnsInitVC(int ns) | |
744 | { | |
cc192b50 | 745 | char buf[MAX_IPSTRLEN]; |
746 | ||
d24ef4e9 | 747 | nsvc *vc = cbdataAlloc(nsvc); |
748 | nameservers[ns].vc = vc; | |
445962f3 | 749 | vc->ns = ns; |
d24ef4e9 | 750 | |
cc192b50 | 751 | IPAddress addr; |
d24ef4e9 | 752 | |
cc192b50 | 753 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
d24ef4e9 | 754 | addr = Config.Addrs.udp_outgoing; |
755 | else | |
756 | addr = Config.Addrs.udp_incoming; | |
757 | ||
032785bf | 758 | vc->queue = new MemBuf; |
d24ef4e9 | 759 | |
032785bf | 760 | vc->msg = new MemBuf; |
d24ef4e9 | 761 | |
762 | vc->fd = comm_open(SOCK_STREAM, | |
763 | IPPROTO_TCP, | |
764 | addr, | |
d24ef4e9 | 765 | COMM_NONBLOCKING, |
63a0e6b7 | 766 | "DNS TCP Socket"); |
d24ef4e9 | 767 | |
768 | if (vc->fd < 0) | |
769 | fatal("Could not create a DNS socket"); | |
770 | ||
771 | comm_add_close_handler(vc->fd, idnsVCClosed, vc); | |
772 | ||
773 | vc->busy = 1; | |
774 | ||
cc192b50 | 775 | commConnectStart(vc->fd, nameservers[ns].S.NtoA(buf,MAX_IPSTRLEN), nameservers[ns].S.GetPort(), idnsInitVCConnected, vc); |
d24ef4e9 | 776 | } |
777 | ||
778 | static void | |
779 | idnsSendQueryVC(idns_query * q, int ns) | |
780 | { | |
781 | if (nameservers[ns].vc == NULL) | |
782 | idnsInitVC(ns); | |
783 | ||
784 | nsvc *vc = nameservers[ns].vc; | |
785 | ||
445962f3 HN |
786 | if (!vc) { |
787 | char buf[MAX_IPSTRLEN]; | |
788 | debugs(78, 1, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[ns].S.NtoA(buf,MAX_IPSTRLEN) << "!"); | |
789 | ||
790 | return; | |
791 | } | |
792 | ||
2fe7eff9 | 793 | vc->queue->reset(); |
d24ef4e9 | 794 | |
795 | short head = htons(q->sz); | |
796 | ||
2fe7eff9 | 797 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 798 | |
2fe7eff9 | 799 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 800 | |
801 | idnsDoSendQueryVC(vc); | |
802 | } | |
803 | ||
7b724b86 | 804 | static void |
805 | idnsSendQuery(idns_query * q) | |
806 | { | |
807 | int x; | |
ef523f99 | 808 | int ns; |
62e76326 | 809 | |
0a69973e | 810 | if (DnsSocket < 0) { |
cc192b50 | 811 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 812 | return; |
0a69973e | 813 | } |
62e76326 | 814 | |
cc192b50 | 815 | if (nns <= 0) { |
816 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); | |
817 | return; | |
818 | } | |
62e76326 | 819 | |
7b724b86 | 820 | assert(q->lru.next == NULL); |
62e76326 | 821 | |
7b724b86 | 822 | assert(q->lru.prev == NULL); |
62e76326 | 823 | |
213b6c90 AJ |
824 | do { |
825 | ns = q->nsends % nns; | |
826 | ||
827 | if (q->need_vc) { | |
828 | idnsSendQueryVC(q, ns); | |
829 | x = 0; | |
830 | } else { | |
831 | x = comm_udp_sendto(DnsSocket, nameservers[ns].S, q->buf, q->sz); | |
832 | } | |
62e76326 | 833 | |
213b6c90 | 834 | q->nsends++; |
62e76326 | 835 | |
820ee9fa | 836 | q->queue_t = q->sent_t = current_time; |
62e76326 | 837 | |
213b6c90 AJ |
838 | if (x < 0) |
839 | debugs(50, 1, "idnsSendQuery: FD " << DnsSocket << ": sendto: " << xstrerror()); | |
62e76326 | 840 | |
213b6c90 | 841 | } while( x<0 && q->nsends % nns != 0); |
62e76326 | 842 | |
213b6c90 | 843 | if(x >= 0) { |
62e76326 | 844 | fd_bytes(DnsSocket, x, FD_WRITE); |
845 | commSetSelect(DnsSocket, COMM_SELECT_READ, idnsRead, NULL, 0); | |
0a69973e | 846 | } |
62e76326 | 847 | |
7cfc1c9a | 848 | nameservers[ns].nqueries++; |
c131f066 | 849 | q->queue_t = current_time; |
7b724b86 | 850 | dlinkAdd(q, &q->lru, &lru_list); |
efd900cb | 851 | idnsTickleQueue(); |
7b724b86 | 852 | } |
853 | ||
854 | static int | |
cc192b50 | 855 | idnsFromKnownNameserver(IPAddress const &from) |
7b724b86 | 856 | { |
857 | int i; | |
62e76326 | 858 | |
859 | for (i = 0; i < nns; i++) | |
860 | { | |
cc192b50 | 861 | if (nameservers[i].S != from) |
62e76326 | 862 | continue; |
863 | ||
cc192b50 | 864 | if (nameservers[i].S.GetPort() != from.GetPort()) |
62e76326 | 865 | continue; |
866 | ||
867 | return i; | |
7b724b86 | 868 | } |
62e76326 | 869 | |
7cfc1c9a | 870 | return -1; |
7b724b86 | 871 | } |
872 | ||
873 | static idns_query * | |
874 | idnsFindQuery(unsigned short id) | |
875 | { | |
876 | dlink_node *n; | |
877 | idns_query *q; | |
62e76326 | 878 | |
7b724b86 | 879 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 880 | q = (idns_query*)n->data; |
881 | ||
882 | if (q->id == id) | |
883 | return q; | |
7b724b86 | 884 | } |
62e76326 | 885 | |
7b724b86 | 886 | return NULL; |
887 | } | |
888 | ||
108d67a0 | 889 | static unsigned short |
890 | idnsQueryID(void) | |
891 | { | |
892 | unsigned short id = squid_random() & 0xFFFF; | |
893 | unsigned short first_id = id; | |
894 | ||
895 | while(idnsFindQuery(id)) { | |
896 | id++; | |
897 | ||
846c8960 | 898 | if (id == first_id) { |
bf8fe701 | 899 | debugs(78, 1, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 900 | break; |
846c8960 | 901 | } |
108d67a0 | 902 | } |
903 | ||
846c8960 | 904 | return id; |
108d67a0 | 905 | } |
906 | ||
3074b9d1 | 907 | static void |
908 | idnsCallback(idns_query *q, rfc1035_rr *answers, int n, const char *error) | |
909 | { | |
910 | IDNSCB *callback; | |
911 | void *cbdata; | |
912 | ||
913 | callback = q->callback; | |
914 | q->callback = NULL; | |
915 | ||
916 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
917 | callback(cbdata, answers, n, error); | |
918 | ||
919 | while(q->queue) { | |
920 | idns_query *q2 = q->queue; | |
921 | q->queue = q2->queue; | |
922 | callback = q2->callback; | |
923 | q2->callback = NULL; | |
924 | ||
925 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
926 | callback(cbdata, answers, n, error); | |
927 | ||
63a0e6b7 | 928 | cbdataFree(q2); |
3074b9d1 | 929 | } |
930 | ||
931 | if (q->hash.key) { | |
932 | hash_remove_link(idns_lookup_hash, &q->hash); | |
933 | q->hash.key = NULL; | |
934 | } | |
935 | } | |
936 | ||
cc192b50 | 937 | void |
938 | idnsDropMessage(rfc1035_message *message, idns_query *q) | |
939 | { | |
940 | rfc1035MessageDestroy(&message); | |
941 | if (q->hash.key) { | |
942 | hash_remove_link(idns_lookup_hash, &q->hash); | |
943 | q->hash.key = NULL; | |
944 | } | |
945 | } | |
946 | ||
7b724b86 | 947 | static void |
948 | idnsGrokReply(const char *buf, size_t sz) | |
949 | { | |
950 | int n; | |
ec7bade0 | 951 | rfc1035_message *message = NULL; |
7b724b86 | 952 | idns_query *q; |
3074b9d1 | 953 | |
cc192b50 | 954 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 955 | |
ec7bade0 | 956 | if (message == NULL) { |
bf8fe701 | 957 | debugs(78, 1, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 958 | return; |
7b724b86 | 959 | } |
62e76326 | 960 | |
cc192b50 | 961 | debugs(78, 3, "idnsGrokReply: ID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 962 | |
963 | q = idnsFindQuery(message->id); | |
964 | ||
7b724b86 | 965 | if (q == NULL) { |
bf8fe701 | 966 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 967 | rfc1035MessageDestroy(&message); |
62e76326 | 968 | return; |
7b724b86 | 969 | } |
62e76326 | 970 | |
9e1f210d | 971 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 972 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 973 | rfc1035MessageDestroy(&message); |
9e1f210d | 974 | return; |
975 | } | |
976 | ||
d24ef4e9 | 977 | if (message->tc) { |
bae9832d | 978 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
d24ef4e9 | 979 | dlinkDelete(&q->lru, &lru_list); |
cc192b50 | 980 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 981 | |
982 | if (!q->need_vc) { | |
983 | q->need_vc = 1; | |
984 | q->nsends--; | |
985 | idnsSendQuery(q); | |
986 | } | |
987 | ||
988 | return; | |
989 | } | |
9e1f210d | 990 | |
a16b4aa0 | 991 | dlinkDelete(&q->lru, &lru_list); |
558be27a | 992 | idnsRcodeCount(n, q->attempt); |
7ba8d0b8 | 993 | q->error = NULL; |
62e76326 | 994 | |
558be27a | 995 | if (n < 0) { |
bf8fe701 | 996 | debugs(78, 3, "idnsGrokReply: error " << rfc1035_error_message << " (" << rfc1035_errno << ")"); |
62e76326 | 997 | |
7ba8d0b8 | 998 | q->error = rfc1035_error_message; |
999 | q->rcode = -n; | |
1000 | ||
1001 | if (q->rcode == 2 && ++q->attempt < MAX_ATTEMPT) { | |
62e76326 | 1002 | /* |
1003 | * RCODE 2 is "Server failure - The name server was | |
1004 | * unable to process this query due to a problem with | |
1005 | * the name server." | |
1006 | */ | |
cc192b50 | 1007 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1008 | rfc1035MessageDestroy(&message); | |
62e76326 | 1009 | q->start_t = current_time; |
108d67a0 | 1010 | q->id = idnsQueryID(); |
1011 | rfc1035SetQueryID(q->buf, q->id); | |
62e76326 | 1012 | idnsSendQuery(q); |
1013 | return; | |
1014 | } | |
68836b58 | 1015 | |
1016 | if (q->rcode == 3 && q->do_searchpath && q->attempt < MAX_ATTEMPT) { | |
1017 | assert(NULL == message->answer); | |
1018 | strcpy(q->name, q->orig); | |
1019 | ||
cc192b50 | 1020 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1021 | ||
68836b58 | 1022 | if (q->domain < npc) { |
1023 | strcat(q->name, "."); | |
1024 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1025 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
68836b58 | 1026 | q->domain++; |
1027 | } else { | |
1028 | q->attempt++; | |
1029 | } | |
1030 | ||
cc192b50 | 1031 | idnsDropMessage(message, q); |
1032 | ||
68836b58 | 1033 | q->start_t = current_time; |
1034 | q->id = idnsQueryID(); | |
1035 | rfc1035SetQueryID(q->buf, q->id); | |
cc192b50 | 1036 | #if USE_IPV6 |
1037 | if(q->query.qtype == RFC1035_TYPE_AAAA) { | |
1038 | debugs(78, 3, "idnsGrokReply: Trying AAAA Query for " << q->name); | |
1039 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1040 | } | |
1041 | else | |
1042 | #endif | |
1043 | { | |
1044 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1045 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1046 | } | |
68836b58 | 1047 | idnsCacheQuery(q); |
1048 | idnsSendQuery(q); | |
1049 | return; | |
1050 | } | |
558be27a | 1051 | } |
62e76326 | 1052 | |
cc192b50 | 1053 | #if USE_IPV6 |
1054 | if(q->need_A && (Config.onoff.dns_require_A == 1 || n <= 0 ) ) | |
1055 | { | |
1056 | /* ERROR or NO AAAA exist. Failover to A records. */ | |
bae9832d | 1057 | /* Apparently its also a good idea to lookup and store the A records |
cc192b50 | 1058 | * just in case the AAAA are not available when we need them. |
1059 | * This could occur due to number of network failings beyond our control | |
1060 | * thus the || above allowing the user to request always both. | |
1061 | */ | |
1062 | ||
1063 | if(n == 0) | |
1064 | debugs(78, 3, "idnsGrokReply: " << q->name << " has no AAAA records. Looking up A record instead."); | |
1065 | else if(q->need_A && n <= 0) | |
1066 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query failed. Trying A now instead."); | |
1067 | else // admin requested this. | |
1068 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query done. Configured to retrieve A now also."); | |
1069 | ||
bae9832d | 1070 | // move the initial message results into the failover query for merging later. |
1071 | if(n > 0) { | |
1072 | q->initial_AAAA.count = message->ancount; | |
1073 | q->initial_AAAA.answers = message->answer; | |
1074 | message->answer = NULL; | |
1075 | } | |
1076 | ||
1077 | // remove the hashed query info | |
cc192b50 | 1078 | idnsDropMessage(message, q); |
1079 | ||
1080 | q->start_t = current_time; | |
1081 | q->id = idnsQueryID(); | |
1082 | rfc1035SetQueryID(q->buf, q->id); | |
1083 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1084 | q->need_A = false; | |
1085 | idnsCacheQuery(q); | |
1086 | idnsSendQuery(q); | |
1087 | return; | |
1088 | } | |
1089 | #endif | |
1090 | ||
bae9832d | 1091 | /** If there are two result sets from preceeding AAAA and A lookups merge them with a preference for AAAA */ |
1092 | if(q->initial_AAAA.count > 0 && n > 0) { | |
1093 | /* two sets of RR need merging */ | |
1094 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q->initial_AAAA.count) ); | |
1095 | rfc1035_rr *tmp = result; | |
1096 | ||
1097 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1098 | ||
1099 | memcpy(tmp, q->initial_AAAA.answers, (sizeof(rfc1035_rr)*(q->initial_AAAA.count)) ); | |
1100 | tmp += q->initial_AAAA.count; | |
1101 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1102 | safe_free(q->initial_AAAA.answers); | |
1103 | ||
1104 | memcpy( tmp, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1105 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1106 | safe_free(message->answer); | |
1107 | ||
1108 | message->answer = result; | |
1109 | n += q->initial_AAAA.count; | |
1110 | q->initial_AAAA.count=0; | |
1111 | } | |
1112 | else if(q->initial_AAAA.count > 0 && n <= 0) { | |
1113 | /* initial of dual queries was the only result set. */ | |
1114 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1115 | rfc1035RRDestroy(&(message->answer), n); | |
1116 | message->answer = q->initial_AAAA.answers; | |
1117 | n = q->initial_AAAA.count; | |
1118 | } | |
1119 | /* else initial results were empty. just use the final set as authoritative */ | |
1120 | ||
1121 | debugs(78, 6, HERE << "Sending " << n << " DNS results to caller."); | |
ec7bade0 | 1122 | idnsCallback(q, message->answer, n, q->error); |
cc192b50 | 1123 | rfc1035MessageDestroy(&message); |
63a0e6b7 | 1124 | cbdataFree(q); |
7b724b86 | 1125 | } |
1126 | ||
1127 | static void | |
1128 | idnsRead(int fd, void *data) | |
1129 | { | |
d193a436 | 1130 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1131 | int len; |
42b51993 | 1132 | int max = INCOMING_DNS_MAX; |
d29b40de | 1133 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
7cfc1c9a | 1134 | int ns; |
cc192b50 | 1135 | IPAddress from; |
1136 | ||
d7e7eaa7 | 1137 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1138 | |
1139 | /* BUG (UNRESOLVED) | |
1140 | * two code lines after returning from comm_udprecvfrom() | |
1141 | * something overwrites the memory behind the from parameter. | |
1142 | * NO matter where in the stack declaration list above it is placed | |
1143 | * The cause of this is still unknown, however copying the data appears | |
1144 | * to allow it to be passed further without this erasure. | |
1145 | */ | |
1146 | IPAddress bugbypass; | |
62e76326 | 1147 | |
7b724b86 | 1148 | while (max--) { |
cc192b50 | 1149 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1150 | |
cc192b50 | 1151 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1152 | |
1153 | if (len == 0) | |
1154 | break; | |
1155 | ||
1156 | if (len < 0) { | |
1157 | if (ignoreErrno(errno)) | |
1158 | break; | |
1159 | ||
7b724b86 | 1160 | #ifdef _SQUID_LINUX_ |
62e76326 | 1161 | /* Some Linux systems seem to set the FD for reading and then |
1162 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1163 | * port unreachable message. */ | |
1164 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1165 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1166 | #endif |
62e76326 | 1167 | |
bf8fe701 | 1168 | debugs(50, 1, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1169 | |
1170 | break; | |
1171 | } | |
1172 | ||
1173 | fd_bytes(DnsSocket, len, FD_READ); | |
1174 | assert(N); | |
1175 | (*N)++; | |
cc192b50 | 1176 | |
1177 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1178 | ||
1179 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
1180 | ns = idnsFromKnownNameserver(from); | |
62e76326 | 1181 | |
1182 | if (ns >= 0) { | |
1183 | nameservers[ns].nreplies++; | |
1184 | } else if (Config.onoff.ignore_unknown_nameservers) { | |
1185 | static time_t last_warning = 0; | |
1186 | ||
1187 | if (squid_curtime - last_warning > 60) { | |
cc192b50 | 1188 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1189 | last_warning = squid_curtime; |
1190 | } | |
cc192b50 | 1191 | else { |
1192 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); | |
2fadd50d | 1193 | } continue; |
62e76326 | 1194 | } |
1195 | ||
62e76326 | 1196 | idnsGrokReply(rbuf, len); |
7b724b86 | 1197 | } |
62e76326 | 1198 | |
2e6caa54 | 1199 | if (lru_list.head) |
62e76326 | 1200 | commSetSelect(DnsSocket, COMM_SELECT_READ, idnsRead, NULL, 0); |
7b724b86 | 1201 | } |
1202 | ||
7cfc1c9a | 1203 | static void |
1204 | idnsCheckQueue(void *unused) | |
1205 | { | |
1206 | dlink_node *n; | |
0c4fe9e4 | 1207 | dlink_node *p = NULL; |
7cfc1c9a | 1208 | idns_query *q; |
1209 | event_queued = 0; | |
62e76326 | 1210 | |
820ee9fa AJ |
1211 | if (0 == nns) |
1212 | /* name servers went away; reconfiguring or shutting down */ | |
1213 | return; | |
1214 | ||
0c4fe9e4 | 1215 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1216 | |
820ee9fa AJ |
1217 | p = n->prev; |
1218 | q = n->data; | |
62e76326 | 1219 | |
820ee9fa AJ |
1220 | /* Anything to process in the queue? */ |
1221 | if (tvSubDsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) | |
1222 | break; | |
62e76326 | 1223 | |
820ee9fa AJ |
1224 | /* Query timer expired? */ |
1225 | if (tvSubDsec(q->sent_t, current_time) < Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns)) { | |
1226 | dlinkDelete(&q->lru, &lru_list); | |
1227 | q->queue_t = current_time; | |
1228 | dlinkAdd(q, &q->lru, &lru_list); | |
1229 | continue; | |
1230 | } | |
62e76326 | 1231 | |
820ee9fa | 1232 | debugs(78, 3, "idnsCheckQueue: ID 0x" << std::hex << std::setfill('0') << std::setw(4) << q->id << "timeout" ); |
62e76326 | 1233 | |
1234 | dlinkDelete(&q->lru, &lru_list); | |
1235 | ||
1236 | if (tvSubDsec(q->start_t, current_time) < Config.Timeout.idns_query) { | |
1237 | idnsSendQuery(q); | |
1238 | } else { | |
4a7a3d56 | 1239 | debugs(78, 2, "idnsCheckQueue: ID " << std::hex << q->id << |
bf8fe701 | 1240 | ": giving up after " << std::dec << q->nsends << " tries and " << |
1241 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); | |
3074b9d1 | 1242 | |
1243 | if (q->rcode != 0) | |
1244 | idnsCallback(q, NULL, -q->rcode, q->error); | |
1245 | else | |
1246 | idnsCallback(q, NULL, -16, "Timeout"); | |
62e76326 | 1247 | |
63a0e6b7 | 1248 | cbdataFree(q); |
62e76326 | 1249 | } |
7cfc1c9a | 1250 | } |
62e76326 | 1251 | |
efd900cb | 1252 | idnsTickleQueue(); |
7cfc1c9a | 1253 | } |
1254 | ||
d24ef4e9 | 1255 | static void |
1256 | idnsReadVC(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) | |
1257 | { | |
1258 | nsvc * vc = (nsvc *)data; | |
1259 | ||
1260 | if (flag == COMM_ERR_CLOSING) | |
1261 | return; | |
1262 | ||
1263 | if (flag != COMM_OK || len <= 0) { | |
1264 | comm_close(fd); | |
1265 | return; | |
1266 | } | |
1267 | ||
032785bf | 1268 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1269 | |
032785bf | 1270 | if (vc->msg->contentSize() < vc->msglen) { |
1271 | comm_read(fd, buf + len, vc->msglen - vc->msg->contentSize(), idnsReadVC, vc); | |
d24ef4e9 | 1272 | return; |
1273 | } | |
1274 | ||
bf8fe701 | 1275 | debugs(78, 3, "idnsReadVC: FD " << fd << ": received " << |
1276 | (int) vc->msg->contentSize() << " bytes via tcp from " << | |
cc192b50 | 1277 | nameservers[vc->ns].S << "."); |
d24ef4e9 | 1278 | |
032785bf | 1279 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize()); |
2fe7eff9 | 1280 | vc->msg->clean(); |
d24ef4e9 | 1281 | comm_read(fd, (char *)&vc->msglen, 2 , idnsReadVCHeader, vc); |
1282 | } | |
1283 | ||
1284 | static void | |
1285 | idnsReadVCHeader(int fd, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) | |
1286 | { | |
1287 | nsvc * vc = (nsvc *)data; | |
1288 | ||
1289 | if (flag == COMM_ERR_CLOSING) | |
1290 | return; | |
1291 | ||
1292 | if (flag != COMM_OK || len <= 0) { | |
1293 | comm_close(fd); | |
1294 | return; | |
1295 | } | |
1296 | ||
1297 | vc->read_msglen += len; | |
1298 | ||
1299 | assert(vc->read_msglen <= 2); | |
1300 | ||
1301 | if (vc->read_msglen < 2) { | |
1302 | comm_read(fd, buf + len, 2 - vc->read_msglen, idnsReadVCHeader, vc); | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | vc->read_msglen = 0; | |
1307 | ||
1308 | vc->msglen = ntohs(vc->msglen); | |
1309 | ||
2fe7eff9 | 1310 | vc->msg->init(vc->msglen, vc->msglen); |
032785bf | 1311 | comm_read(fd, vc->msg->buf, vc->msglen, idnsReadVC, vc); |
d24ef4e9 | 1312 | } |
1313 | ||
558be27a | 1314 | /* |
1315 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1316 | */ | |
1317 | static void | |
1318 | idnsRcodeCount(int rcode, int attempt) | |
1319 | { | |
1320 | if (rcode > 0) | |
62e76326 | 1321 | rcode = 0; |
558be27a | 1322 | else if (rcode < 0) |
62e76326 | 1323 | rcode = -rcode; |
1324 | ||
558be27a | 1325 | if (rcode < MAX_RCODE) |
62e76326 | 1326 | if (attempt < MAX_ATTEMPT) |
1327 | RcodeMatrix[rcode][attempt]++; | |
558be27a | 1328 | } |
1329 | ||
7b724b86 | 1330 | /* ====================================================================== */ |
1331 | ||
5f5e883f FC |
1332 | static void |
1333 | idnsRegisterWithCacheManager(void) | |
1334 | { | |
1335 | CacheManager::GetInstance()-> | |
1336 | registerAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); | |
1337 | } | |
1338 | ||
7b724b86 | 1339 | void |
1340 | idnsInit(void) | |
1341 | { | |
1342 | static int init = 0; | |
62e76326 | 1343 | |
d24ef4e9 | 1344 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1345 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1346 | |
ef523f99 | 1347 | if (DnsSocket < 0) { |
62e76326 | 1348 | int port; |
1349 | ||
cc192b50 | 1350 | IPAddress addr; |
62e76326 | 1351 | |
cc192b50 | 1352 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
62e76326 | 1353 | addr = Config.Addrs.udp_outgoing; |
1354 | else | |
1355 | addr = Config.Addrs.udp_incoming; | |
1356 | ||
1357 | DnsSocket = comm_open(SOCK_DGRAM, | |
bdb741f4 | 1358 | IPPROTO_UDP, |
62e76326 | 1359 | addr, |
62e76326 | 1360 | COMM_NONBLOCKING, |
1361 | "DNS Socket"); | |
1362 | ||
cc192b50 | 1363 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addr); |
1364 | ||
62e76326 | 1365 | if (DnsSocket < 0) |
1366 | fatal("Could not create a DNS socket"); | |
1367 | ||
1368 | /* Ouch... we can't call functions using debug from a debug | |
1369 | * statement. Doing so messes up the internal Debug::level | |
1370 | */ | |
1371 | port = comm_local_port(DnsSocket); | |
1372 | ||
cc192b50 | 1373 | debugs(78, 1, "DNS Socket created at " << addr << ", FD " << DnsSocket); |
7b724b86 | 1374 | } |
62e76326 | 1375 | |
efd900cb | 1376 | assert(0 == nns); |
1377 | idnsParseNameservers(); | |
0e6d05ef | 1378 | #ifndef _SQUID_MSWIN_ |
62e76326 | 1379 | |
efd900cb | 1380 | if (0 == nns) |
62e76326 | 1381 | idnsParseResolvConf(); |
1382 | ||
0e6d05ef | 1383 | #endif |
ec4daaa5 | 1384 | #ifdef _SQUID_WIN32_ |
62e76326 | 1385 | |
0e6d05ef | 1386 | if (0 == nns) |
62e76326 | 1387 | idnsParseWIN32Registry(); |
1388 | ||
0e6d05ef | 1389 | #endif |
62e76326 | 1390 | |
29fe9bd5 | 1391 | if (0 == nns) { |
1392 | debugs(78, 1, "Warning: Could not find any nameservers. Trying to use localhost"); | |
ec4daaa5 | 1393 | #ifdef _SQUID_WIN32_ |
29fe9bd5 | 1394 | |
1395 | debugs(78, 1, "Please check your TCP-IP settings or /etc/resolv.conf file"); | |
0e6d05ef | 1396 | #else |
29fe9bd5 | 1397 | |
1398 | debugs(78, 1, "Please check your /etc/resolv.conf file"); | |
0e6d05ef | 1399 | #endif |
29fe9bd5 | 1400 | |
1401 | debugs(78, 1, "or use the 'dns_nameservers' option in squid.conf."); | |
1402 | idnsAddNameserver("127.0.0.1"); | |
1403 | } | |
62e76326 | 1404 | |
7b724b86 | 1405 | if (!init) { |
62e76326 | 1406 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1407 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1408 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
62e76326 | 1409 | init++; |
7b724b86 | 1410 | } |
372fb44e FC |
1411 | |
1412 | idnsRegisterWithCacheManager(); | |
7b724b86 | 1413 | } |
1414 | ||
1415 | void | |
1416 | idnsShutdown(void) | |
1417 | { | |
ef523f99 | 1418 | if (DnsSocket < 0) |
62e76326 | 1419 | return; |
1420 | ||
ef523f99 | 1421 | comm_close(DnsSocket); |
62e76326 | 1422 | |
ef523f99 | 1423 | DnsSocket = -1; |
62e76326 | 1424 | |
b26754c4 | 1425 | for (int i = 0; i < nns; i++) { |
1426 | if (nsvc *vc = nameservers[i].vc) { | |
1427 | if (vc->fd >= 0) | |
1428 | comm_close(vc->fd); | |
1429 | } | |
1430 | } | |
1431 | ||
efd900cb | 1432 | idnsFreeNameservers(); |
68836b58 | 1433 | |
1434 | idnsFreeSearchpath(); | |
7b724b86 | 1435 | } |
1436 | ||
3074b9d1 | 1437 | static int |
1438 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1439 | { | |
1440 | idns_query *q; | |
1441 | ||
1442 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1443 | ||
1444 | if (!old) | |
1445 | return 0; | |
1446 | ||
63a0e6b7 | 1447 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1448 | |
1449 | q->callback = callback; | |
1450 | ||
1451 | q->callback_data = cbdataReference(data); | |
1452 | ||
1453 | q->queue = old->queue; | |
1454 | ||
1455 | old->queue = q; | |
1456 | ||
1457 | return 1; | |
1458 | } | |
1459 | ||
1460 | static void | |
9e1f210d | 1461 | idnsCacheQuery(idns_query *q) |
3074b9d1 | 1462 | { |
9e1f210d | 1463 | q->hash.key = q->query.name; |
3074b9d1 | 1464 | hash_join(idns_lookup_hash, &q->hash); |
1465 | } | |
1466 | ||
7b724b86 | 1467 | void |
1468 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1469 | { | |
68836b58 | 1470 | unsigned int i; |
1471 | int nd = 0; | |
3074b9d1 | 1472 | idns_query *q; |
1473 | ||
1474 | if (idnsCachedLookup(name, callback, data)) | |
1475 | return; | |
1476 | ||
63a0e6b7 | 1477 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1478 | |
71952967 | 1479 | q->id = idnsQueryID(); |
1480 | ||
68836b58 | 1481 | for (i = 0; i < strlen(name); i++) |
1482 | if (name[i] == '.') | |
1483 | nd++; | |
1484 | ||
1485 | if (Config.onoff.res_defnames && npc > 0 && name[strlen(name)-1] != '.') { | |
1486 | q->do_searchpath = 1; | |
1487 | } else { | |
1488 | q->do_searchpath = 0; | |
1489 | } | |
1490 | ||
1491 | strcpy(q->orig, name); | |
1492 | strcpy(q->name, q->orig); | |
1493 | ||
1494 | if (q->do_searchpath && nd < ndots) { | |
1495 | q->domain = 0; | |
1496 | strcat(q->name, "."); | |
1497 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1498 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1499 | } |
1500 | ||
cc192b50 | 1501 | #if USE_IPV6 |
1502 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1503 | q->need_A = true; | |
1504 | #else | |
1505 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->id, &q->query); | |
1506 | q->need_A = false; | |
1507 | #endif | |
62e76326 | 1508 | |
2041330b | 1509 | if (q->sz < 0) { |
1510 | /* problem with query data -- query not sent */ | |
1511 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1512 | cbdataFree(q); |
2041330b | 1513 | return; |
1514 | } | |
1515 | ||
4a7a3d56 | 1516 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
bf8fe701 | 1517 | ", id = 0x" << std::hex << q->id); |
aa6c61e3 | 1518 | |
7b724b86 | 1519 | q->callback = callback; |
aa6c61e3 | 1520 | |
fa80a8ef | 1521 | q->callback_data = cbdataReference(data); |
aa6c61e3 | 1522 | |
7cfc1c9a | 1523 | q->start_t = current_time; |
aa6c61e3 | 1524 | |
9e1f210d | 1525 | idnsCacheQuery(q); |
aa6c61e3 | 1526 | |
7b724b86 | 1527 | idnsSendQuery(q); |
1528 | } | |
8db71107 | 1529 | |
1530 | void | |
cc192b50 | 1531 | idnsPTRLookup(const IPAddress &addr, IDNSCB * callback, void *data) |
8db71107 | 1532 | { |
3074b9d1 | 1533 | idns_query *q; |
1534 | ||
cc192b50 | 1535 | char ip[MAX_IPSTRLEN]; |
1536 | ||
1537 | addr.NtoA(ip,MAX_IPSTRLEN); | |
3074b9d1 | 1538 | |
63a0e6b7 | 1539 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1540 | |
71952967 | 1541 | q->id = idnsQueryID(); |
1542 | ||
cc192b50 | 1543 | #if USE_IPV6 |
1544 | if( addr.IsIPv6() ) { | |
1545 | struct in6_addr addr6; | |
1546 | addr.GetInAddr(addr6); | |
1547 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->id, &q->query); | |
1548 | } | |
1549 | else | |
1550 | #endif | |
1551 | { | |
1552 | struct in_addr addr4; | |
1553 | addr.GetInAddr(addr4); | |
1554 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->id, &q->query); | |
1555 | } | |
1556 | ||
1557 | /* PTR does not do inbound A/AAAA */ | |
1558 | q->need_A = false; | |
3074b9d1 | 1559 | |
2041330b | 1560 | if (q->sz < 0) |
1561 | { | |
1562 | /* problem with query data -- query not sent */ | |
1563 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1564 | cbdataFree(q); |
2041330b | 1565 | return; |
1566 | } | |
1567 | ||
37f3da43 | 1568 | if (idnsCachedLookup(q->query.name, callback, data)) { |
1569 | cbdataFree(q); | |
1570 | return; | |
1571 | } | |
1572 | ||
4a7a3d56 | 1573 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
bf8fe701 | 1574 | ", id = 0x" << std::hex << q->id); |
3074b9d1 | 1575 | |
8db71107 | 1576 | q->callback = callback; |
3074b9d1 | 1577 | |
fa80a8ef | 1578 | q->callback_data = cbdataReference(data); |
3074b9d1 | 1579 | |
8db71107 | 1580 | q->start_t = current_time; |
3074b9d1 | 1581 | |
9e1f210d | 1582 | idnsCacheQuery(q); |
3074b9d1 | 1583 | |
8db71107 | 1584 | idnsSendQuery(q); |
1585 | } | |
eb824054 | 1586 | |
3c573763 | 1587 | #ifdef SQUID_SNMP |
1588 | /* | |
1589 | * The function to return the DNS via SNMP | |
1590 | */ | |
1591 | variable_list * | |
1592 | snmp_netIdnsFn(variable_list * Var, snint * ErrP) | |
1593 | { | |
1594 | int i, n = 0; | |
1595 | variable_list *Answer = NULL; | |
bf8fe701 | 1596 | debugs(49, 5, "snmp_netDnsFn: Processing request: "); |
3c573763 | 1597 | snmpDebugOid(5, Var->name, Var->name_length); |
1598 | *ErrP = SNMP_ERR_NOERROR; | |
62e76326 | 1599 | |
3c573763 | 1600 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1601 | |
3c573763 | 1602 | case DNS_REQ: |
62e76326 | 1603 | |
1604 | for (i = 0; i < nns; i++) | |
1605 | n += nameservers[i].nqueries; | |
1606 | ||
1607 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1608 | n, | |
1609 | SMI_COUNTER32); | |
1610 | ||
1611 | break; | |
1612 | ||
3c573763 | 1613 | case DNS_REP: |
62e76326 | 1614 | for (i = 0; i < nns; i++) |
1615 | n += nameservers[i].nreplies; | |
1616 | ||
1617 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1618 | n, | |
1619 | SMI_COUNTER32); | |
1620 | ||
1621 | break; | |
1622 | ||
3c573763 | 1623 | case DNS_SERVERS: |
62e76326 | 1624 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1625 | nns, |
62e76326 | 1626 | SMI_COUNTER32); |
1627 | ||
1628 | break; | |
1629 | ||
3c573763 | 1630 | default: |
62e76326 | 1631 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1632 | ||
1633 | break; | |
3c573763 | 1634 | } |
62e76326 | 1635 | |
3c573763 | 1636 | return Answer; |
1637 | } | |
62e76326 | 1638 | |
3c573763 | 1639 | #endif /*SQUID_SNMP */ |
1f1ae50a | 1640 | #endif /* USE_DNSSERVERS */ |