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7b724b86 | 1 | /* |
262a0e14 | 2 | * $Id$ |
7b724b86 | 3 | * |
4 | * DEBUG: section 78 DNS lookups; interacts with lib/rfc1035.c | |
5 | * AUTHOR: Duane Wessels | |
6 | * | |
2b6662ba | 7 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
7b724b86 | 8 | * ---------------------------------------------------------- |
9 | * | |
2b6662ba | 10 | * Squid is the result of efforts by numerous individuals from |
11 | * the Internet community; see the CONTRIBUTORS file for full | |
12 | * details. Many organizations have provided support for Squid's | |
13 | * development; see the SPONSORS file for full details. Squid is | |
14 | * Copyrighted (C) 2001 by the Regents of the University of | |
15 | * California; see the COPYRIGHT file for full details. Squid | |
16 | * incorporates software developed and/or copyrighted by other | |
17 | * sources; see the CREDITS file for full details. | |
7b724b86 | 18 | * |
19 | * This program is free software; you can redistribute it and/or modify | |
20 | * it under the terms of the GNU General Public License as published by | |
21 | * the Free Software Foundation; either version 2 of the License, or | |
22 | * (at your option) any later version. | |
26ac0430 | 23 | * |
7b724b86 | 24 | * This program is distributed in the hope that it will be useful, |
25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | * GNU General Public License for more details. | |
26ac0430 | 28 | * |
7b724b86 | 29 | * You should have received a copy of the GNU General Public License |
30 | * along with this program; if not, write to the Free Software | |
31 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
32 | * | |
33 | */ | |
34 | ||
35 | #include "squid.h" | |
55cbb02b | 36 | #include "comm/Connection.h" |
aed188fd | 37 | #include "comm/ConnOpener.h" |
063dc1eb | 38 | #include "comm.h" |
d841c88d AJ |
39 | #include "comm/Loops.h" |
40 | #include "comm/Write.h" | |
cfd66529 | 41 | #include "event.h" |
985c86bc | 42 | #include "SquidTime.h" |
e6ccf245 | 43 | #include "Store.h" |
2c471ba8 | 44 | #include "fde.h" |
055421ee | 45 | #include "ip/tools.h" |
0eb49b6d | 46 | #include "MemBuf.h" |
8822ebee | 47 | #include "mgr/Registration.h" |
7176768b | 48 | #include "util.h" |
d295d770 | 49 | #include "wordlist.h" |
91dcbd43 | 50 | #include "base/InstanceId.h" |
68836b58 | 51 | |
52 | #if HAVE_ARPA_NAMESER_H | |
53 | #include <arpa/nameser.h> | |
54 | #endif | |
55 | #if HAVE_RESOLV_H | |
56 | #include <resolv.h> | |
57 | #endif | |
58 | ||
454e8283 | 59 | /* MS Visual Studio Projects are monolithic, so we need the following |
1f1ae50a | 60 | #ifndef to exclude the internal DNS code from compile process when |
61 | using external DNS process. | |
62 | */ | |
32d002cb | 63 | #if !USE_DNSSERVERS |
be266cb2 | 64 | #if _SQUID_WINDOWS_ |
1a774556 | 65 | #include "squid_windows.h" |
0dde2160 GS |
66 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
67 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
68 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 69 | #endif |
68836b58 | 70 | #ifndef _PATH_RESCONF |
71 | #define _PATH_RESCONF "/etc/resolv.conf" | |
72 | #endif | |
73 | #ifndef NS_DEFAULTPORT | |
74 | #define NS_DEFAULTPORT 53 | |
75 | #endif | |
76 | ||
77 | #ifndef NS_MAXDNAME | |
78 | #define NS_MAXDNAME 1025 | |
79 | #endif | |
80 | ||
81 | #ifndef MAXDNSRCH | |
82 | #define MAXDNSRCH 6 | |
7b724b86 | 83 | #endif |
68836b58 | 84 | |
85 | /* The buffer size required to store the maximum allowed search path */ | |
86 | #ifndef RESOLV_BUFSZ | |
87 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 88 | #endif |
89 | ||
42b51993 | 90 | #define IDNS_MAX_TRIES 20 |
e210930b | 91 | #define MAX_RCODE 17 |
558be27a | 92 | #define MAX_ATTEMPT 3 |
93 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
94 | // NP: see http://www.iana.org/assignments/dns-parameters |
95 | static const char *Rcodes[] = { | |
24520b1b AJ |
96 | /* RFC 1035 */ |
97 | "Success", | |
98 | "Packet Format Error", | |
99 | "DNS Server Failure", | |
100 | "Non-Existent Domain", | |
101 | "Not Implemented", | |
102 | "Query Refused", | |
103 | /* RFC 2136 */ | |
104 | "Name Exists when it should not", | |
105 | "RR Set Exists when it should not", | |
106 | "RR Set that should exist does not", | |
107 | "Server Not Authoritative for zone", | |
108 | "Name not contained in zone", | |
109 | /* unassigned */ | |
110 | "","","","","", | |
111 | /* RFC 2671 */ | |
112 | "Bad OPT Version or TSIG Signature Failure" | |
113 | }; | |
558be27a | 114 | |
58a39dc9 | 115 | typedef struct _idns_query idns_query; |
62e76326 | 116 | |
7b724b86 | 117 | typedef struct _ns ns; |
58a39dc9 | 118 | |
68836b58 | 119 | typedef struct _sp sp; |
120 | ||
d24ef4e9 | 121 | typedef struct _nsvc nsvc; |
122 | ||
26ac0430 | 123 | struct _idns_query { |
3074b9d1 | 124 | hash_link hash; |
9e1f210d | 125 | rfc1035_query query; |
68836b58 | 126 | char buf[RESOLV_BUFSZ]; |
127 | char name[NS_MAXDNAME + 1]; | |
128 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 129 | ssize_t sz; |
13b08e1c A |
130 | unsigned short msg_id; /// random query ID sent to server; changes with every query sent |
131 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried | |
91dcbd43 | 132 | |
58a39dc9 | 133 | int nsends; |
d24ef4e9 | 134 | int need_vc; |
62e76326 | 135 | |
58a39dc9 | 136 | struct timeval start_t; |
137 | struct timeval sent_t; | |
820ee9fa | 138 | struct timeval queue_t; |
58a39dc9 | 139 | dlink_node lru; |
140 | IDNSCB *callback; | |
141 | void *callback_data; | |
558be27a | 142 | int attempt; |
7ba8d0b8 | 143 | int rcode; |
3074b9d1 | 144 | idns_query *queue; |
68836b58 | 145 | unsigned short domain; |
146 | unsigned short do_searchpath; | |
cc192b50 | 147 | bool need_A; |
bae9832d | 148 | struct { |
149 | int count; | |
150 | rfc1035_rr *answers; | |
151 | } initial_AAAA; | |
58a39dc9 | 152 | }; |
91dcbd43 | 153 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 154 | |
26ac0430 | 155 | struct _nsvc { |
d24ef4e9 | 156 | int ns; |
00406b24 | 157 | Comm::ConnectionPointer conn; |
d24ef4e9 | 158 | unsigned short msglen; |
159 | int read_msglen; | |
032785bf | 160 | MemBuf *msg; |
161 | MemBuf *queue; | |
d24ef4e9 | 162 | bool busy; |
163 | }; | |
164 | ||
26ac0430 | 165 | struct _ns { |
b7ac5457 | 166 | Ip::Address S; |
7b724b86 | 167 | int nqueries; |
168 | int nreplies; | |
e210930b AJ |
169 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
170 | int last_seen_edns; | |
171 | #endif | |
d24ef4e9 | 172 | nsvc *vc; |
7b724b86 | 173 | }; |
58a39dc9 | 174 | |
26ac0430 | 175 | struct _sp { |
68836b58 | 176 | char domain[NS_MAXDNAME]; |
177 | int queries; | |
178 | }; | |
179 | ||
d24ef4e9 | 180 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 181 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 182 | |
7b724b86 | 183 | static ns *nameservers = NULL; |
68836b58 | 184 | static sp *searchpath = NULL; |
7b724b86 | 185 | static int nns = 0; |
186 | static int nns_alloc = 0; | |
68836b58 | 187 | static int npc = 0; |
188 | static int npc_alloc = 0; | |
189 | static int ndots = 1; | |
7b724b86 | 190 | static dlink_list lru_list; |
7cfc1c9a | 191 | static int event_queued = 0; |
3074b9d1 | 192 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 193 | |
e210930b AJ |
194 | /* |
195 | * Notes on EDNS: | |
196 | * | |
197 | * IPv4: | |
198 | * EDNS as specified may be sent as an additional record for any request. | |
199 | * early testing has revealed that it works on common devices, but cannot | |
200 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
201 | * | |
202 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
203 | * | |
204 | * Squid design: | |
205 | * Squid is optimized to generate one packet and re-send it to all NS | |
206 | * due to this we cannot customize the EDNS size per NS. | |
207 | * | |
208 | * As such we take the configuration option value as fixed. | |
209 | * | |
210 | * FUTURE TODO: | |
211 | * This may not be worth doing, but if/when additional-records are parsed | |
212 | * we will be able to recover the OPT value specific to any one NS and | |
213 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
214 | * size our active NS are capable. | |
215 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
216 | * Responses from the configured NS may cause this to be raised or turned off. | |
217 | */ | |
218 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
219 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
220 | #endif | |
221 | ||
7b724b86 | 222 | static OBJH idnsStats; |
223 | static void idnsAddNameserver(const char *buf); | |
68836b58 | 224 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 225 | static void idnsFreeNameservers(void); |
68836b58 | 226 | static void idnsFreeSearchpath(void); |
efd900cb | 227 | static void idnsParseNameservers(void); |
1191b93b | 228 | #if !_SQUID_MSWIN_ |
7b724b86 | 229 | static void idnsParseResolvConf(void); |
1f1ae50a | 230 | #endif |
be266cb2 | 231 | #if _SQUID_WINDOWS_ |
0e6d05ef | 232 | static void idnsParseWIN32Registry(void); |
d02b72b4 | 233 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 234 | #endif |
68836b58 | 235 | static void idnsCacheQuery(idns_query * q); |
7b724b86 | 236 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 237 | static IOCB idnsReadVCHeader; |
e0d28505 | 238 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 239 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
240 | static IOCB idnsReadVC; |
241 | static IOCB idnsSentQueryVC; | |
62e76326 | 242 | |
b7ac5457 | 243 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 244 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 245 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 246 | static PF idnsRead; |
7cfc1c9a | 247 | static EVH idnsCheckQueue; |
efd900cb | 248 | static void idnsTickleQueue(void); |
558be27a | 249 | static void idnsRcodeCount(int, int); |
cfd66529 | 250 | static void idnsVCClosed(int fd, void *data); |
91dcbd43 | 251 | static unsigned short idnsQueryID(void); |
7b724b86 | 252 | |
253 | static void | |
254 | idnsAddNameserver(const char *buf) | |
255 | { | |
b7ac5457 | 256 | Ip::Address A; |
62e76326 | 257 | |
cc192b50 | 258 | if (!(A = buf)) { |
bf8fe701 | 259 | debugs(78, 0, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 260 | return; |
d20b1cd0 | 261 | } |
62e76326 | 262 | |
cc192b50 | 263 | if (A.IsAnyAddr()) { |
264 | debugs(78, 0, "WARNING: Squid does not accept " << A << " in DNS server specifications."); | |
715b5def | 265 | A.SetLocalhost(); |
cc192b50 | 266 | debugs(78, 0, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 267 | } |
62e76326 | 268 | |
715b5def AJ |
269 | if (!Ip::EnableIpv6 && !A.SetIPv4()) { |
270 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); | |
271 | return; | |
5c5a349d | 272 | } |
62e76326 | 273 | |
7b724b86 | 274 | if (nns == nns_alloc) { |
62e76326 | 275 | int oldalloc = nns_alloc; |
276 | ns *oldptr = nameservers; | |
277 | ||
278 | if (nns_alloc == 0) | |
279 | nns_alloc = 2; | |
280 | else | |
281 | nns_alloc <<= 1; | |
282 | ||
283 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
284 | ||
285 | if (oldptr && oldalloc) | |
41d00cd3 | 286 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 287 | |
288 | if (oldptr) | |
289 | safe_free(oldptr); | |
7b724b86 | 290 | } |
62e76326 | 291 | |
7b724b86 | 292 | assert(nns < nns_alloc); |
cc192b50 | 293 | A.SetPort(NS_DEFAULTPORT); |
294 | nameservers[nns].S = A; | |
e210930b AJ |
295 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
296 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
297 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
298 | #endif | |
cc192b50 | 299 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
7b724b86 | 300 | nns++; |
301 | } | |
302 | ||
68836b58 | 303 | static void |
304 | idnsAddPathComponent(const char *buf) | |
305 | { | |
306 | if (npc == npc_alloc) { | |
307 | int oldalloc = npc_alloc; | |
308 | sp *oldptr = searchpath; | |
309 | ||
310 | if (0 == npc_alloc) | |
311 | npc_alloc = 2; | |
312 | else | |
313 | npc_alloc <<= 1; | |
314 | ||
315 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
316 | ||
317 | if (oldptr && oldalloc) | |
41d00cd3 | 318 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 319 | |
320 | if (oldptr) | |
321 | safe_free(oldptr); | |
322 | } | |
323 | ||
324 | assert(npc < npc_alloc); | |
325 | strcpy(searchpath[npc].domain, buf); | |
7176768b | 326 | Tolower(searchpath[npc].domain); |
bf8fe701 | 327 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
68836b58 | 328 | npc++; |
329 | } | |
330 | ||
2ea84e89 | 331 | |
7b724b86 | 332 | static void |
333 | idnsFreeNameservers(void) | |
334 | { | |
335 | safe_free(nameservers); | |
336 | nns = nns_alloc = 0; | |
337 | } | |
338 | ||
68836b58 | 339 | static void |
340 | idnsFreeSearchpath(void) | |
341 | { | |
342 | safe_free(searchpath); | |
343 | npc = npc_alloc = 0; | |
344 | } | |
345 | ||
346 | ||
347 | ||
efd900cb | 348 | static void |
349 | idnsParseNameservers(void) | |
350 | { | |
351 | wordlist *w; | |
62e76326 | 352 | |
efd900cb | 353 | for (w = Config.dns_nameservers; w; w = w->next) { |
bf8fe701 | 354 | debugs(78, 1, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 355 | idnsAddNameserver(w->key); |
efd900cb | 356 | } |
357 | } | |
358 | ||
1191b93b | 359 | #if !_SQUID_MSWIN_ |
7b724b86 | 360 | static void |
361 | idnsParseResolvConf(void) | |
362 | { | |
363 | FILE *fp; | |
68836b58 | 364 | char buf[RESOLV_BUFSZ]; |
a083e75a | 365 | const char *t; |
68836b58 | 366 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 367 | |
7b724b86 | 368 | if (fp == NULL) { |
bf8fe701 | 369 | debugs(78, 1, "" << _PATH_RESCONF << ": " << xstrerror()); |
62e76326 | 370 | return; |
7b724b86 | 371 | } |
62e76326 | 372 | |
be266cb2 | 373 | #if _SQUID_CYGWIN_ |
c4aefe96 | 374 | setmode(fileno(fp), O_TEXT); |
375 | #endif | |
62e76326 | 376 | |
68836b58 | 377 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 378 | t = strtok(buf, w_space); |
379 | ||
68836b58 | 380 | if (NULL == t) { |
62e76326 | 381 | continue; |
68836b58 | 382 | } else if (strcasecmp(t, "nameserver") == 0) { |
383 | t = strtok(NULL, w_space); | |
62e76326 | 384 | |
68836b58 | 385 | if (NULL == t) |
386 | continue; | |
62e76326 | 387 | |
bf8fe701 | 388 | debugs(78, 1, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 389 | |
68836b58 | 390 | idnsAddNameserver(t); |
a083e75a | 391 | } else if (strcasecmp(t, "domain") == 0) { |
26ac0430 AJ |
392 | idnsFreeSearchpath(); |
393 | t = strtok(NULL, w_space); | |
a083e75a | 394 | |
26ac0430 AJ |
395 | if (NULL == t) |
396 | continue; | |
a083e75a | 397 | |
26ac0430 | 398 | debugs(78, 1, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 399 | |
26ac0430 | 400 | idnsAddPathComponent(t); |
68836b58 | 401 | } else if (strcasecmp(t, "search") == 0) { |
26ac0430 | 402 | idnsFreeSearchpath(); |
68836b58 | 403 | while (NULL != t) { |
404 | t = strtok(NULL, w_space); | |
405 | ||
406 | if (NULL == t) | |
407 | continue; | |
408 | ||
bf8fe701 | 409 | debugs(78, 1, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 410 | |
411 | idnsAddPathComponent(t); | |
412 | } | |
413 | } else if (strcasecmp(t, "options") == 0) { | |
414 | while (NULL != t) { | |
415 | t = strtok(NULL, w_space); | |
62e76326 | 416 | |
68836b58 | 417 | if (NULL == t) |
418 | continue; | |
62e76326 | 419 | |
2c2da7d3 | 420 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 421 | ndots = atoi(t + 6); |
422 | ||
423 | if (ndots < 1) | |
424 | ndots = 1; | |
425 | ||
bf8fe701 | 426 | debugs(78, 1, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 427 | } |
428 | } | |
429 | } | |
7b724b86 | 430 | } |
a083e75a | 431 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
432 | t = strchr(t, '.'); |
433 | if (t) | |
434 | idnsAddPathComponent(t+1); | |
a083e75a | 435 | } |
62e76326 | 436 | |
7b724b86 | 437 | fclose(fp); |
438 | } | |
439 | ||
1f1ae50a | 440 | #endif |
441 | ||
be266cb2 | 442 | #if _SQUID_WINDOWS_ |
6b610e34 | 443 | static void |
d02b72b4 | 444 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 445 | { |
a16cb11f | 446 | char *t; |
6b610e34 | 447 | char *token; |
448 | HKEY hndKey; | |
449 | ||
0dde2160 | 450 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 451 | DWORD Type = 0; |
452 | DWORD Size = 0; | |
453 | LONG Result; | |
04f7fd38 | 454 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
455 | |
456 | if (Result == ERROR_SUCCESS && Size) { | |
457 | t = (char *) xmalloc(Size); | |
0dde2160 | 458 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
26ac0430 AJ |
459 | debugs(78, 1, "Adding domain " << t << " from Registry"); |
460 | idnsAddPathComponent(t); | |
461 | xfree(t); | |
462 | } | |
04f7fd38 | 463 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 464 | |
465 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 466 | t = (char *) xmalloc(Size); |
04f7fd38 | 467 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 468 | token = strtok(t, Separator); |
6b610e34 | 469 | |
470 | while (token) { | |
471 | idnsAddPathComponent(token); | |
472 | debugs(78, 1, "Adding domain " << token << " from Registry"); | |
473 | token = strtok(NULL, Separator); | |
474 | } | |
26ac0430 | 475 | xfree(t); |
6b610e34 | 476 | } |
477 | ||
478 | RegCloseKey(hndKey); | |
479 | } | |
a6cae565 | 480 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
481 | t = strchr(t, '.'); |
482 | if (t) | |
483 | idnsAddPathComponent(t + 1); | |
a16cb11f | 484 | } |
6b610e34 | 485 | } |
486 | ||
0e6d05ef | 487 | static void |
488 | idnsParseWIN32Registry(void) | |
489 | { | |
a16cb11f | 490 | char *t; |
0e6d05ef | 491 | char *token; |
492 | HKEY hndKey, hndKey2; | |
493 | ||
0e6d05ef | 494 | switch (WIN32_OS_version) { |
62e76326 | 495 | |
0e6d05ef | 496 | case _WIN_OS_WINNT: |
62e76326 | 497 | /* get nameservers from the Windows NT registry */ |
498 | ||
04f7fd38 | 499 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 500 | DWORD Type = 0; |
501 | DWORD Size = 0; | |
502 | LONG Result; | |
04f7fd38 | 503 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 504 | |
505 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 506 | t = (char *) xmalloc(Size); |
0dde2160 | 507 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 508 | token = strtok(t, ", "); |
62e76326 | 509 | |
510 | while (token) { | |
511 | idnsAddNameserver(token); | |
6b610e34 | 512 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
513 | token = strtok(NULL, ","); | |
62e76326 | 514 | } |
26ac0430 | 515 | xfree(t); |
62e76326 | 516 | } |
517 | ||
0dde2160 | 518 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 519 | |
520 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 521 | t = (char *) xmalloc(Size); |
a6cae565 | 522 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 523 | token = strtok(t, ", "); |
62e76326 | 524 | |
525 | while (token) { | |
6b610e34 | 526 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 527 | idnsAddNameserver(token); |
528 | token = strtok(NULL, ", "); | |
529 | } | |
26ac0430 | 530 | xfree(t); |
62e76326 | 531 | } |
532 | ||
533 | RegCloseKey(hndKey); | |
534 | } | |
535 | ||
6b610e34 | 536 | idnsParseWIN32SearchList(" "); |
537 | ||
62e76326 | 538 | break; |
539 | ||
0e6d05ef | 540 | case _WIN_OS_WIN2K: |
62e76326 | 541 | |
b671cc68 | 542 | case _WIN_OS_WINXP: |
62e76326 | 543 | |
6b1846cf | 544 | case _WIN_OS_WINNET: |
28170269 | 545 | |
546 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
547 | |
548 | case _WIN_OS_WIN7: | |
62e76326 | 549 | /* get nameservers from the Windows 2000 registry */ |
550 | /* search all interfaces for DNS server addresses */ | |
551 | ||
04f7fd38 | 552 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 553 | int i; |
04f7fd38 AJ |
554 | DWORD MaxSubkeyLen, InterfacesCount; |
555 | char *keyname; | |
556 | FILETIME ftLastWriteTime; | |
557 | ||
558 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
559 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
560 | for (i = 0; i < (int) InterfacesCount; i++) { | |
561 | DWORD j; | |
562 | j = MaxSubkeyLen; | |
563 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
564 | char *newkeyname; | |
565 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
566 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
567 | strcat(newkeyname, "\\"); | |
568 | strcat(newkeyname, keyname); | |
569 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
570 | DWORD Type = 0; | |
571 | DWORD Size = 0; | |
572 | LONG Result; | |
573 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
574 | if (Result == ERROR_SUCCESS && Size) { | |
575 | t = (char *) xmalloc(Size); | |
576 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
577 | token = strtok(t, ", "); | |
578 | while (token) { | |
0dde2160 | 579 | debugs(78, 1, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 AJ |
580 | idnsAddNameserver(token); |
581 | token = strtok(NULL, ", "); | |
582 | } | |
583 | xfree(t); | |
584 | } | |
585 | ||
586 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
587 | if (Result == ERROR_SUCCESS && Size) { | |
588 | t = (char *) xmalloc(Size); | |
589 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
590 | token = strtok(t, ", "); | |
591 | while (token) { | |
592 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); | |
593 | idnsAddNameserver(token); | |
594 | token = strtok(NULL, ", "); | |
595 | } | |
596 | ||
597 | xfree(t); | |
62e76326 | 598 | } |
62e76326 | 599 | |
0dde2160 | 600 | RegCloseKey(hndKey2); |
62e76326 | 601 | } |
602 | ||
04f7fd38 | 603 | xfree(newkeyname); |
62e76326 | 604 | } |
605 | } | |
0dde2160 | 606 | |
04f7fd38 | 607 | xfree(keyname); |
62e76326 | 608 | } |
609 | ||
610 | RegCloseKey(hndKey); | |
611 | } | |
612 | ||
6b610e34 | 613 | idnsParseWIN32SearchList(", "); |
614 | ||
62e76326 | 615 | break; |
616 | ||
0e6d05ef | 617 | case _WIN_OS_WIN95: |
62e76326 | 618 | |
0e6d05ef | 619 | case _WIN_OS_WIN98: |
62e76326 | 620 | |
be20dac7 | 621 | case _WIN_OS_WINME: |
62e76326 | 622 | /* get nameservers from the Windows 9X registry */ |
623 | ||
04f7fd38 | 624 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 625 | DWORD Type = 0; |
626 | DWORD Size = 0; | |
627 | LONG Result; | |
04f7fd38 | 628 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 629 | |
630 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 631 | t = (char *) xmalloc(Size); |
a6cae565 | 632 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 633 | token = strtok(t, ", "); |
62e76326 | 634 | |
635 | while (token) { | |
6b610e34 | 636 | debugs(78, 1, "Adding nameserver " << token << " from Registry"); |
62e76326 | 637 | idnsAddNameserver(token); |
638 | token = strtok(NULL, ", "); | |
639 | } | |
26ac0430 | 640 | xfree(t); |
62e76326 | 641 | } |
642 | ||
643 | RegCloseKey(hndKey); | |
644 | } | |
645 | ||
646 | break; | |
647 | ||
0e6d05ef | 648 | default: |
6b610e34 | 649 | debugs(78, 1, "Failed to read nameserver from Registry: Unknown System Type."); |
62e76326 | 650 | return; |
0e6d05ef | 651 | } |
652 | } | |
62e76326 | 653 | |
0e6d05ef | 654 | #endif |
655 | ||
7b724b86 | 656 | static void |
657 | idnsStats(StoreEntry * sentry) | |
658 | { | |
a16b4aa0 | 659 | dlink_node *n; |
660 | idns_query *q; | |
7cfc1c9a | 661 | int i; |
558be27a | 662 | int j; |
cc192b50 | 663 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 664 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 665 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 666 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
667 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND\n"); | |
668 | storeAppendPrintf(sentry, "------ ---- ----- ---------- ---------\n"); | |
62e76326 | 669 | |
a16b4aa0 | 670 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 671 | q = (idns_query *)n->data; |
672 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f\n", | |
91dcbd43 | 673 | (int) q->msg_id, (int) q->sz, q->nsends, |
62e76326 | 674 | tvSubDsec(q->start_t, current_time), |
675 | tvSubDsec(q->sent_t, current_time)); | |
7cfc1c9a | 676 | } |
62e76326 | 677 | |
e210930b | 678 | if (Config.dns.packet_max > 0) |
d8b258a9 | 679 | storeAppendPrintf(sentry, "DNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b AJ |
680 | else |
681 | storeAppendPrintf(sentry, "DNS jumbo-grams: not working\n"); | |
682 | ||
7cfc1c9a | 683 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
cc192b50 | 684 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES\n"); |
685 | storeAppendPrintf(sentry, "---------------------------------------------- --------- ---------\n"); | |
62e76326 | 686 | |
7cfc1c9a | 687 | for (i = 0; i < nns; i++) { |
cc192b50 | 688 | storeAppendPrintf(sentry, "%-45s %9d %9d\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
689 | nameservers[i].S.NtoA(buf,MAX_IPSTRLEN), | |
62e76326 | 690 | nameservers[i].nqueries, |
691 | nameservers[i].nreplies); | |
a16b4aa0 | 692 | } |
62e76326 | 693 | |
558be27a | 694 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
695 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 696 | |
558be27a | 697 | for (i = 0; i < MAX_ATTEMPT; i++) |
62e76326 | 698 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
699 | ||
e210930b | 700 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 701 | |
558be27a | 702 | for (j = 0; j < MAX_RCODE; j++) { |
e210930b AJ |
703 | if (j > 10 && j < 16) |
704 | continue; // unassigned by IANA. | |
705 | ||
62e76326 | 706 | storeAppendPrintf(sentry, "%5d", j); |
707 | ||
708 | for (i = 0; i < MAX_ATTEMPT; i++) | |
709 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); | |
710 | ||
e210930b | 711 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 712 | } |
6b610e34 | 713 | |
714 | if (npc) { | |
715 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
716 | ||
717 | for (i=0; i < npc; i++) | |
718 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); | |
719 | ||
720 | storeAppendPrintf(sentry, "\n"); | |
721 | } | |
7b724b86 | 722 | } |
723 | ||
efd900cb | 724 | static void |
725 | idnsTickleQueue(void) | |
726 | { | |
727 | if (event_queued) | |
62e76326 | 728 | return; |
729 | ||
efd900cb | 730 | if (NULL == lru_list.tail) |
62e76326 | 731 | return; |
732 | ||
fd0f51c4 CT |
733 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
734 | ||
735 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 736 | |
efd900cb | 737 | event_queued = 1; |
738 | } | |
739 | ||
d24ef4e9 | 740 | static void |
e0d28505 | 741 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *buf, size_t size, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 742 | { |
743 | nsvc * vc = (nsvc *)data; | |
744 | ||
745 | if (flag == COMM_ERR_CLOSING) | |
746 | return; | |
af6a12ee | 747 | |
e0d28505 AJ |
748 | // XXX: irrelevant now that we have conn pointer? |
749 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 750 | return; |
d24ef4e9 | 751 | |
752 | if (flag != COMM_OK || size <= 0) { | |
80463bb4 | 753 | conn->close(); |
d24ef4e9 | 754 | return; |
755 | } | |
756 | ||
757 | vc->busy = 0; | |
758 | idnsDoSendQueryVC(vc); | |
759 | } | |
760 | ||
761 | static void | |
762 | idnsDoSendQueryVC(nsvc *vc) | |
763 | { | |
764 | if (vc->busy) | |
765 | return; | |
766 | ||
032785bf | 767 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 768 | return; |
769 | ||
032785bf | 770 | MemBuf *mb = vc->queue; |
d24ef4e9 | 771 | |
032785bf | 772 | vc->queue = new MemBuf; |
d24ef4e9 | 773 | |
774 | vc->busy = 1; | |
775 | ||
fd0f51c4 | 776 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
777 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
778 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 779 | AsyncCall::Pointer nil; |
d4b21972 | 780 | |
1b76e6c1 | 781 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 782 | |
ec41b64c AJ |
783 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
784 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 785 | Comm::Write(vc->conn, mb, call); |
032785bf | 786 | |
787 | delete mb; | |
d24ef4e9 | 788 | } |
789 | ||
790 | static void | |
00406b24 | 791 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, comm_err_t status, int xerrno, void *data) |
d24ef4e9 | 792 | { |
793 | nsvc * vc = (nsvc *)data; | |
794 | ||
cfd66529 | 795 | if (status != COMM_OK || !conn) { |
dd3fb890 AR |
796 | char buf[MAX_IPSTRLEN] = ""; |
797 | if (vc->ns < nns) | |
798 | nameservers[vc->ns].S.NtoA(buf,MAX_IPSTRLEN); | |
00406b24 | 799 | debugs(78, 1, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 800 | return; |
801 | } | |
802 | ||
00406b24 | 803 | vc->conn = conn; |
cfd66529 AJ |
804 | |
805 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
806 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
807 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
808 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 809 | vc->busy = 0; |
810 | idnsDoSendQueryVC(vc); | |
811 | } | |
812 | ||
813 | static void | |
814 | idnsVCClosed(int fd, void *data) | |
815 | { | |
816 | nsvc * vc = (nsvc *)data; | |
032785bf | 817 | delete vc->queue; |
818 | delete vc->msg; | |
00406b24 | 819 | vc->conn = NULL; |
dd3fb890 AR |
820 | if (vc->ns < nns) // XXX: idnsShutdown may have freed nameservers[] |
821 | nameservers[vc->ns].vc = NULL; | |
63a0e6b7 | 822 | cbdataFree(vc); |
d24ef4e9 | 823 | } |
824 | ||
825 | static void | |
826 | idnsInitVC(int ns) | |
827 | { | |
828 | nsvc *vc = cbdataAlloc(nsvc); | |
dd3fb890 | 829 | assert(ns < nns); |
00406b24 | 830 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
d24ef4e9 | 831 | nameservers[ns].vc = vc; |
445962f3 | 832 | vc->ns = ns; |
032785bf | 833 | vc->queue = new MemBuf; |
032785bf | 834 | vc->msg = new MemBuf; |
cfd66529 | 835 | vc->busy = 1; |
d24ef4e9 | 836 | |
00406b24 | 837 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 AJ |
838 | |
839 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) | |
840 | conn->local = Config.Addrs.udp_outgoing; | |
841 | else | |
842 | conn->local = Config.Addrs.udp_incoming; | |
843 | ||
cfd66529 | 844 | conn->remote = nameservers[ns].S; |
d24ef4e9 | 845 | |
cfd66529 | 846 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 847 | |
4accd6d8 | 848 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 849 | cs->setHost("DNS TCP Socket"); |
855150a4 | 850 | AsyncJob::Start(cs); |
d24ef4e9 | 851 | } |
852 | ||
853 | static void | |
854 | idnsSendQueryVC(idns_query * q, int ns) | |
855 | { | |
dd3fb890 | 856 | assert(ns < nns); |
d24ef4e9 | 857 | if (nameservers[ns].vc == NULL) |
858 | idnsInitVC(ns); | |
859 | ||
860 | nsvc *vc = nameservers[ns].vc; | |
861 | ||
445962f3 HN |
862 | if (!vc) { |
863 | char buf[MAX_IPSTRLEN]; | |
864 | debugs(78, 1, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[ns].S.NtoA(buf,MAX_IPSTRLEN) << "!"); | |
865 | ||
866 | return; | |
867 | } | |
868 | ||
2fe7eff9 | 869 | vc->queue->reset(); |
d24ef4e9 | 870 | |
871 | short head = htons(q->sz); | |
872 | ||
2fe7eff9 | 873 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 874 | |
2fe7eff9 | 875 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 876 | |
877 | idnsDoSendQueryVC(vc); | |
878 | } | |
879 | ||
7b724b86 | 880 | static void |
881 | idnsSendQuery(idns_query * q) | |
882 | { | |
4d6c8504 | 883 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
cc192b50 | 884 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 885 | return; |
0a69973e | 886 | } |
62e76326 | 887 | |
cc192b50 | 888 | if (nns <= 0) { |
889 | debugs(78, 1, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); | |
890 | return; | |
891 | } | |
62e76326 | 892 | |
7b724b86 | 893 | assert(q->lru.next == NULL); |
62e76326 | 894 | |
7b724b86 | 895 | assert(q->lru.prev == NULL); |
62e76326 | 896 | |
4d6c8504 AJ |
897 | int x = -1, y = -1; |
898 | int ns; | |
899 | ||
91dcbd43 CT |
900 | q->start_t = current_time; |
901 | q->msg_id = idnsQueryID(); | |
902 | rfc1035SetQueryID(q->buf, q->msg_id); | |
903 | ||
213b6c90 AJ |
904 | do { |
905 | ns = q->nsends % nns; | |
906 | ||
907 | if (q->need_vc) { | |
908 | idnsSendQueryVC(q, ns); | |
4d6c8504 | 909 | x = y = 0; |
213b6c90 | 910 | } else { |
055421ee | 911 | if (DnsSocketB >= 0 && nameservers[ns].S.IsIPv6()) |
4d6c8504 | 912 | y = comm_udp_sendto(DnsSocketB, nameservers[ns].S, q->buf, q->sz); |
bd6a0c8f | 913 | else if (DnsSocketA) |
4d6c8504 | 914 | x = comm_udp_sendto(DnsSocketA, nameservers[ns].S, q->buf, q->sz); |
213b6c90 | 915 | } |
62e76326 | 916 | |
213b6c90 | 917 | q->nsends++; |
62e76326 | 918 | |
820ee9fa | 919 | q->queue_t = q->sent_t = current_time; |
62e76326 | 920 | |
4d6c8504 AJ |
921 | if (y < 0 && nameservers[ns].S.IsIPv6()) |
922 | debugs(50, 1, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); | |
923 | if (x < 0 && nameservers[ns].S.IsIPv4()) | |
4d6c8504 AJ |
924 | debugs(50, 1, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
925 | ||
926 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 927 | |
bd6a0c8f | 928 | if (y > 0) { |
4d6c8504 | 929 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 930 | } |
bd6a0c8f | 931 | if (x > 0) { |
4d6c8504 | 932 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 933 | } |
62e76326 | 934 | |
7cfc1c9a | 935 | nameservers[ns].nqueries++; |
c131f066 | 936 | q->queue_t = current_time; |
7b724b86 | 937 | dlinkAdd(q, &q->lru, &lru_list); |
efd900cb | 938 | idnsTickleQueue(); |
7b724b86 | 939 | } |
940 | ||
941 | static int | |
b7ac5457 | 942 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 943 | { |
944 | int i; | |
62e76326 | 945 | |
26ac0430 | 946 | for (i = 0; i < nns; i++) { |
cc192b50 | 947 | if (nameservers[i].S != from) |
62e76326 | 948 | continue; |
949 | ||
cc192b50 | 950 | if (nameservers[i].S.GetPort() != from.GetPort()) |
62e76326 | 951 | continue; |
952 | ||
953 | return i; | |
7b724b86 | 954 | } |
62e76326 | 955 | |
7cfc1c9a | 956 | return -1; |
7b724b86 | 957 | } |
958 | ||
959 | static idns_query * | |
960 | idnsFindQuery(unsigned short id) | |
961 | { | |
962 | dlink_node *n; | |
963 | idns_query *q; | |
62e76326 | 964 | |
7b724b86 | 965 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 966 | q = (idns_query*)n->data; |
967 | ||
91dcbd43 | 968 | if (q->msg_id == id) |
62e76326 | 969 | return q; |
7b724b86 | 970 | } |
62e76326 | 971 | |
7b724b86 | 972 | return NULL; |
973 | } | |
974 | ||
108d67a0 | 975 | static unsigned short |
976 | idnsQueryID(void) | |
977 | { | |
978 | unsigned short id = squid_random() & 0xFFFF; | |
979 | unsigned short first_id = id; | |
980 | ||
26ac0430 | 981 | while (idnsFindQuery(id)) { |
108d67a0 | 982 | id++; |
983 | ||
846c8960 | 984 | if (id == first_id) { |
bf8fe701 | 985 | debugs(78, 1, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 986 | break; |
846c8960 | 987 | } |
108d67a0 | 988 | } |
989 | ||
846c8960 | 990 | return id; |
108d67a0 | 991 | } |
992 | ||
3074b9d1 | 993 | static void |
994 | idnsCallback(idns_query *q, rfc1035_rr *answers, int n, const char *error) | |
995 | { | |
996 | IDNSCB *callback; | |
997 | void *cbdata; | |
998 | ||
999 | callback = q->callback; | |
1000 | q->callback = NULL; | |
1001 | ||
1002 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1003 | callback(cbdata, answers, n, error); | |
1004 | ||
26ac0430 | 1005 | while (q->queue) { |
3074b9d1 | 1006 | idns_query *q2 = q->queue; |
1007 | q->queue = q2->queue; | |
1008 | callback = q2->callback; | |
1009 | q2->callback = NULL; | |
1010 | ||
1011 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1012 | callback(cbdata, answers, n, error); | |
1013 | ||
63a0e6b7 | 1014 | cbdataFree(q2); |
3074b9d1 | 1015 | } |
1016 | ||
1017 | if (q->hash.key) { | |
1018 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1019 | q->hash.key = NULL; | |
1020 | } | |
1021 | } | |
1022 | ||
cc192b50 | 1023 | void |
1024 | idnsDropMessage(rfc1035_message *message, idns_query *q) | |
1025 | { | |
1026 | rfc1035MessageDestroy(&message); | |
1027 | if (q->hash.key) { | |
1028 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1029 | q->hash.key = NULL; | |
1030 | } | |
1031 | } | |
1032 | ||
7b724b86 | 1033 | static void |
e210930b | 1034 | idnsGrokReply(const char *buf, size_t sz, int from_ns) |
7b724b86 | 1035 | { |
1036 | int n; | |
ec7bade0 | 1037 | rfc1035_message *message = NULL; |
7b724b86 | 1038 | idns_query *q; |
3074b9d1 | 1039 | |
cc192b50 | 1040 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1041 | |
ec7bade0 | 1042 | if (message == NULL) { |
bf8fe701 | 1043 | debugs(78, 1, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1044 | return; |
7b724b86 | 1045 | } |
62e76326 | 1046 | |
91dcbd43 | 1047 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1048 | |
1049 | q = idnsFindQuery(message->id); | |
1050 | ||
7b724b86 | 1051 | if (q == NULL) { |
bf8fe701 | 1052 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1053 | rfc1035MessageDestroy(&message); |
62e76326 | 1054 | return; |
7b724b86 | 1055 | } |
62e76326 | 1056 | |
9e1f210d | 1057 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1058 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1059 | rfc1035MessageDestroy(&message); |
9e1f210d | 1060 | return; |
1061 | } | |
1062 | ||
e210930b AJ |
1063 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1064 | // TODO: actually gr the message right here. | |
1065 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q | |
1066 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1067 | // AND allows us to merge AN+AR sections from both responses (one day) | |
1068 | ||
1069 | if (q->edns_seen >= 0) { | |
1070 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1071 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1072 | // the altered NS was limiting the whole group. | |
1073 | max_shared_edns = q->edns_seen; | |
1074 | // may be limited by one of the others still | |
1075 | for (int i = 0; i < nns; i++) | |
1076 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); | |
1077 | } else { | |
1078 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1079 | // maybe reduce the global limit downwards to accomodate this NS | |
1080 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1081 | } | |
1082 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1083 | max_shared_edns = -1; | |
1084 | } | |
1085 | #endif | |
1086 | ||
d24ef4e9 | 1087 | if (message->tc) { |
bae9832d | 1088 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
d24ef4e9 | 1089 | dlinkDelete(&q->lru, &lru_list); |
cc192b50 | 1090 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1091 | |
1092 | if (!q->need_vc) { | |
1093 | q->need_vc = 1; | |
1094 | q->nsends--; | |
1095 | idnsSendQuery(q); | |
91dcbd43 CT |
1096 | } else { |
1097 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1098 | // Return an error and cleanup; no point in trying TCP again. | |
1099 | debugs(78, 3, HERE << "TCP DNS response"); | |
1100 | idnsCallback(q, NULL, 0, "Truncated TCP DNS response"); | |
1101 | cbdataFree(q); | |
d24ef4e9 | 1102 | } |
1103 | ||
1104 | return; | |
1105 | } | |
9e1f210d | 1106 | |
a16b4aa0 | 1107 | dlinkDelete(&q->lru, &lru_list); |
558be27a | 1108 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1109 | |
558be27a | 1110 | if (n < 0) { |
7ba8d0b8 | 1111 | q->rcode = -n; |
42687bb2 | 1112 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1113 | |
1114 | if (q->rcode == 2 && ++q->attempt < MAX_ATTEMPT) { | |
62e76326 | 1115 | /* |
1116 | * RCODE 2 is "Server failure - The name server was | |
1117 | * unable to process this query due to a problem with | |
1118 | * the name server." | |
1119 | */ | |
cc192b50 | 1120 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1121 | rfc1035MessageDestroy(&message); | |
62e76326 | 1122 | idnsSendQuery(q); |
1123 | return; | |
1124 | } | |
68836b58 | 1125 | |
1126 | if (q->rcode == 3 && q->do_searchpath && q->attempt < MAX_ATTEMPT) { | |
1127 | assert(NULL == message->answer); | |
1128 | strcpy(q->name, q->orig); | |
1129 | ||
cc192b50 | 1130 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1131 | ||
68836b58 | 1132 | if (q->domain < npc) { |
1133 | strcat(q->name, "."); | |
1134 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1135 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
68836b58 | 1136 | q->domain++; |
1137 | } else { | |
1138 | q->attempt++; | |
1139 | } | |
1140 | ||
cc192b50 | 1141 | idnsDropMessage(message, q); |
1142 | ||
055421ee | 1143 | if (Ip::EnableIpv6 && q->query.qtype == RFC1035_TYPE_AAAA) { |
cc192b50 | 1144 | debugs(78, 3, "idnsGrokReply: Trying AAAA Query for " << q->name); |
91dcbd43 | 1145 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), 0, &q->query, Config.dns.packet_max); |
055421ee | 1146 | } else { |
cc192b50 | 1147 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); |
e210930b | 1148 | // see EDNS notes at top of file why this sends 0 |
91dcbd43 | 1149 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), 0, &q->query, 0); |
cc192b50 | 1150 | } |
c4a7fa29 AJ |
1151 | |
1152 | if (q->sz < 0) { | |
1153 | /* problem with query data -- query not sent */ | |
21c5a65e | 1154 | idnsCallback(static_cast<idns_query *>(q->callback_data), NULL, 0, "Internal error"); |
c4a7fa29 AJ |
1155 | cbdataFree(q); |
1156 | return; | |
1157 | } | |
1158 | ||
68836b58 | 1159 | idnsCacheQuery(q); |
1160 | idnsSendQuery(q); | |
1161 | return; | |
1162 | } | |
558be27a | 1163 | } |
62e76326 | 1164 | |
26ac0430 | 1165 | if (q->need_A && (Config.onoff.dns_require_A == 1 || n <= 0 ) ) { |
cc192b50 | 1166 | /* ERROR or NO AAAA exist. Failover to A records. */ |
bae9832d | 1167 | /* Apparently its also a good idea to lookup and store the A records |
cc192b50 | 1168 | * just in case the AAAA are not available when we need them. |
1169 | * This could occur due to number of network failings beyond our control | |
1170 | * thus the || above allowing the user to request always both. | |
1171 | */ | |
1172 | ||
26ac0430 | 1173 | if (n == 0) |
cc192b50 | 1174 | debugs(78, 3, "idnsGrokReply: " << q->name << " has no AAAA records. Looking up A record instead."); |
26ac0430 | 1175 | else if (q->need_A && n <= 0) |
cc192b50 | 1176 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query failed. Trying A now instead."); |
1177 | else // admin requested this. | |
1178 | debugs(78, 3, "idnsGrokReply: " << q->name << " AAAA query done. Configured to retrieve A now also."); | |
1179 | ||
bae9832d | 1180 | // move the initial message results into the failover query for merging later. |
26ac0430 | 1181 | if (n > 0) { |
bae9832d | 1182 | q->initial_AAAA.count = message->ancount; |
1183 | q->initial_AAAA.answers = message->answer; | |
1184 | message->answer = NULL; | |
1185 | } | |
1186 | ||
1187 | // remove the hashed query info | |
cc192b50 | 1188 | idnsDropMessage(message, q); |
1189 | ||
ca75572c HN |
1190 | // reset the query as an A query |
1191 | q->nsends = 0; | |
e210930b | 1192 | // see EDNS notes at top of file why this sends 0 |
91dcbd43 | 1193 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), 0, &q->query, 0); |
cc192b50 | 1194 | q->need_A = false; |
c4a7fa29 AJ |
1195 | |
1196 | if (q->sz < 0) { | |
1197 | /* problem with query data -- query not sent */ | |
21c5a65e | 1198 | idnsCallback(static_cast<idns_query *>(q->callback_data), NULL, 0, "Internal error"); |
c4a7fa29 AJ |
1199 | cbdataFree(q); |
1200 | return; | |
1201 | } | |
1202 | ||
cc192b50 | 1203 | idnsCacheQuery(q); |
1204 | idnsSendQuery(q); | |
1205 | return; | |
1206 | } | |
cc192b50 | 1207 | |
26ac0430 AJ |
1208 | /** If there are two result sets from preceeding AAAA and A lookups merge them with a preference for AAAA */ |
1209 | if (q->initial_AAAA.count > 0 && n > 0) { | |
bae9832d | 1210 | /* two sets of RR need merging */ |
1211 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q->initial_AAAA.count) ); | |
1212 | rfc1035_rr *tmp = result; | |
1213 | ||
1214 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1215 | ||
1216 | memcpy(tmp, q->initial_AAAA.answers, (sizeof(rfc1035_rr)*(q->initial_AAAA.count)) ); | |
1217 | tmp += q->initial_AAAA.count; | |
1218 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1219 | safe_free(q->initial_AAAA.answers); | |
1220 | ||
1221 | memcpy( tmp, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1222 | /* free the RR object without freeing its child strings (they are now taken by the copy above) */ | |
1223 | safe_free(message->answer); | |
1224 | ||
1225 | message->answer = result; | |
8be70f52 | 1226 | message->ancount += q->initial_AAAA.count; |
bae9832d | 1227 | n += q->initial_AAAA.count; |
1228 | q->initial_AAAA.count=0; | |
26ac0430 | 1229 | } else if (q->initial_AAAA.count > 0 && n <= 0) { |
bae9832d | 1230 | /* initial of dual queries was the only result set. */ |
1231 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " AAAA has " << q->initial_AAAA.count << " RR, A has " << n << " RR"); | |
1232 | rfc1035RRDestroy(&(message->answer), n); | |
1233 | message->answer = q->initial_AAAA.answers; | |
1234 | n = q->initial_AAAA.count; | |
1235 | } | |
1236 | /* else initial results were empty. just use the final set as authoritative */ | |
1237 | ||
1238 | debugs(78, 6, HERE << "Sending " << n << " DNS results to caller."); | |
a14eb55e | 1239 | idnsCallback(q, message->answer, n, rfc1035ErrorMessage(n)); |
cc192b50 | 1240 | rfc1035MessageDestroy(&message); |
63a0e6b7 | 1241 | cbdataFree(q); |
7b724b86 | 1242 | } |
1243 | ||
1244 | static void | |
1245 | idnsRead(int fd, void *data) | |
1246 | { | |
d193a436 | 1247 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1248 | int len; |
42b51993 | 1249 | int max = INCOMING_DNS_MAX; |
d29b40de | 1250 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
7cfc1c9a | 1251 | int ns; |
b7ac5457 | 1252 | Ip::Address from; |
cc192b50 | 1253 | |
d7e7eaa7 | 1254 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1255 | |
bd6a0c8f HN |
1256 | // Always keep reading. This stops (or at least makes harder) several |
1257 | // attacks on the DNS client. | |
d841c88d | 1258 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1259 | |
cc192b50 | 1260 | /* BUG (UNRESOLVED) |
1261 | * two code lines after returning from comm_udprecvfrom() | |
1262 | * something overwrites the memory behind the from parameter. | |
1263 | * NO matter where in the stack declaration list above it is placed | |
1264 | * The cause of this is still unknown, however copying the data appears | |
1265 | * to allow it to be passed further without this erasure. | |
1266 | */ | |
b7ac5457 | 1267 | Ip::Address bugbypass; |
62e76326 | 1268 | |
7b724b86 | 1269 | while (max--) { |
cc192b50 | 1270 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1271 | |
cc192b50 | 1272 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1273 | |
1274 | if (len == 0) | |
1275 | break; | |
1276 | ||
1277 | if (len < 0) { | |
1278 | if (ignoreErrno(errno)) | |
1279 | break; | |
1280 | ||
1191b93b | 1281 | #if _SQUID_LINUX_ |
62e76326 | 1282 | /* Some Linux systems seem to set the FD for reading and then |
1283 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1284 | * port unreachable message. */ | |
1285 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1286 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1287 | #endif |
62e76326 | 1288 | |
bf8fe701 | 1289 | debugs(50, 1, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1290 | |
1291 | break; | |
1292 | } | |
1293 | ||
055421ee | 1294 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1295 | |
62e76326 | 1296 | assert(N); |
1297 | (*N)++; | |
cc192b50 | 1298 | |
1299 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1300 | ||
1301 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
1302 | ns = idnsFromKnownNameserver(from); | |
62e76326 | 1303 | |
1304 | if (ns >= 0) { | |
1305 | nameservers[ns].nreplies++; | |
bd6a0c8f HN |
1306 | } |
1307 | ||
1308 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1309 | // but after the ++ above to keep statistics right. | |
1310 | if (!lru_list.head) | |
1311 | continue; // Don't process replies if there is no pending query. | |
1312 | ||
1313 | if (ns < 0 && Config.onoff.ignore_unknown_nameservers) { | |
62e76326 | 1314 | static time_t last_warning = 0; |
1315 | ||
1316 | if (squid_curtime - last_warning > 60) { | |
cc192b50 | 1317 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1318 | last_warning = squid_curtime; |
26ac0430 | 1319 | } else { |
cc192b50 | 1320 | debugs(78, 1, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1321 | } |
1322 | continue; | |
62e76326 | 1323 | } |
1324 | ||
e210930b | 1325 | idnsGrokReply(rbuf, len, ns); |
7b724b86 | 1326 | } |
1327 | } | |
1328 | ||
7cfc1c9a | 1329 | static void |
1330 | idnsCheckQueue(void *unused) | |
1331 | { | |
1332 | dlink_node *n; | |
0c4fe9e4 | 1333 | dlink_node *p = NULL; |
7cfc1c9a | 1334 | idns_query *q; |
1335 | event_queued = 0; | |
62e76326 | 1336 | |
820ee9fa AJ |
1337 | if (0 == nns) |
1338 | /* name servers went away; reconfiguring or shutting down */ | |
1339 | return; | |
1340 | ||
0c4fe9e4 | 1341 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1342 | |
820ee9fa | 1343 | p = n->prev; |
733cedc0 | 1344 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1345 | |
820ee9fa | 1346 | /* Anything to process in the queue? */ |
fd0f51c4 | 1347 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1348 | break; |
62e76326 | 1349 | |
820ee9fa | 1350 | /* Query timer expired? */ |
fd0f51c4 | 1351 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1352 | dlinkDelete(&q->lru, &lru_list); |
1353 | q->queue_t = current_time; | |
1354 | dlinkAdd(q, &q->lru, &lru_list); | |
1355 | continue; | |
1356 | } | |
62e76326 | 1357 | |
91dcbd43 CT |
1358 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1359 | " QID 0x" << std::hex << std::setfill('0') << | |
1360 | std::setw(4) << q->msg_id << ": timeout" ); | |
62e76326 | 1361 | |
1362 | dlinkDelete(&q->lru, &lru_list); | |
1363 | ||
fd0f51c4 | 1364 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1365 | idnsSendQuery(q); |
1366 | } else { | |
91dcbd43 CT |
1367 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
1368 | " QID 0x" << std::hex << q->msg_id << | |
1369 | " : giving up after " << std::dec << q->nsends << " tries and " << | |
26ac0430 | 1370 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1371 | |
1372 | if (q->rcode != 0) | |
a14eb55e | 1373 | idnsCallback(q, NULL, -q->rcode, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1374 | else |
1375 | idnsCallback(q, NULL, -16, "Timeout"); | |
62e76326 | 1376 | |
63a0e6b7 | 1377 | cbdataFree(q); |
62e76326 | 1378 | } |
7cfc1c9a | 1379 | } |
62e76326 | 1380 | |
efd900cb | 1381 | idnsTickleQueue(); |
7cfc1c9a | 1382 | } |
1383 | ||
d24ef4e9 | 1384 | static void |
e0d28505 | 1385 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1386 | { |
1387 | nsvc * vc = (nsvc *)data; | |
1388 | ||
1389 | if (flag == COMM_ERR_CLOSING) | |
1390 | return; | |
1391 | ||
1392 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1393 | if (Comm::IsConnOpen(conn)) |
1394 | conn->close(); | |
d24ef4e9 | 1395 | return; |
1396 | } | |
1397 | ||
bd6a0c8f | 1398 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1399 | |
032785bf | 1400 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1401 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1402 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1403 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1404 | return; |
1405 | } | |
1406 | ||
dd3fb890 | 1407 | assert(vc->ns < nns); |
e0d28505 | 1408 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1409 | |
e210930b | 1410 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1411 | vc->msg->clean(); |
abd8f140 AJ |
1412 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1413 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1414 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1415 | } |
1416 | ||
1417 | static void | |
e0d28505 | 1418 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1419 | { |
1420 | nsvc * vc = (nsvc *)data; | |
1421 | ||
1422 | if (flag == COMM_ERR_CLOSING) | |
1423 | return; | |
1424 | ||
1425 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1426 | if (Comm::IsConnOpen(conn)) |
1427 | conn->close(); | |
d24ef4e9 | 1428 | return; |
1429 | } | |
1430 | ||
1431 | vc->read_msglen += len; | |
1432 | ||
1433 | assert(vc->read_msglen <= 2); | |
1434 | ||
1435 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1436 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1437 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1438 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1439 | return; |
1440 | } | |
1441 | ||
1442 | vc->read_msglen = 0; | |
1443 | ||
1444 | vc->msglen = ntohs(vc->msglen); | |
1445 | ||
2fe7eff9 | 1446 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1447 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1448 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1449 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1450 | } |
1451 | ||
558be27a | 1452 | /* |
1453 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1454 | */ | |
1455 | static void | |
1456 | idnsRcodeCount(int rcode, int attempt) | |
1457 | { | |
1458 | if (rcode > 0) | |
62e76326 | 1459 | rcode = 0; |
558be27a | 1460 | else if (rcode < 0) |
62e76326 | 1461 | rcode = -rcode; |
1462 | ||
558be27a | 1463 | if (rcode < MAX_RCODE) |
62e76326 | 1464 | if (attempt < MAX_ATTEMPT) |
1465 | RcodeMatrix[rcode][attempt]++; | |
558be27a | 1466 | } |
1467 | ||
7b724b86 | 1468 | /* ====================================================================== */ |
1469 | ||
5f5e883f FC |
1470 | static void |
1471 | idnsRegisterWithCacheManager(void) | |
1472 | { | |
8822ebee | 1473 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1474 | } |
1475 | ||
7b724b86 | 1476 | void |
1477 | idnsInit(void) | |
1478 | { | |
1479 | static int init = 0; | |
62e76326 | 1480 | |
d24ef4e9 | 1481 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1482 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1483 | |
4d6c8504 | 1484 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
055421ee | 1485 | Ip::Address addrA; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1486 | |
cc192b50 | 1487 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
055421ee | 1488 | addrA = Config.Addrs.udp_outgoing; |
62e76326 | 1489 | else |
055421ee | 1490 | addrA = Config.Addrs.udp_incoming; |
62e76326 | 1491 | |
055421ee AJ |
1492 | Ip::Address addrB = addrA; |
1493 | addrA.SetIPv4(); | |
7e07ced1 | 1494 | |
dc7c14ba | 1495 | if (Ip::EnableIpv6 && addrB.IsIPv6()) { |
055421ee | 1496 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrB); |
4d6c8504 | 1497 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1498 | IPPROTO_UDP, |
055421ee | 1499 | addrB, |
04f7fd38 | 1500 | COMM_NONBLOCKING, |
055421ee | 1501 | "DNS Socket IPv6"); |
7e07ced1 | 1502 | } |
4d6c8504 | 1503 | |
dc7c14ba | 1504 | if (addrA.IsIPv4()) { |
055421ee | 1505 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrA); |
4d6c8504 | 1506 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1507 | IPPROTO_UDP, |
055421ee | 1508 | addrA, |
04f7fd38 | 1509 | COMM_NONBLOCKING, |
055421ee | 1510 | "DNS Socket IPv4"); |
7e07ced1 | 1511 | } |
62e76326 | 1512 | |
4d6c8504 | 1513 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1514 | fatal("Could not create a DNS socket"); |
1515 | ||
1516 | /* Ouch... we can't call functions using debug from a debug | |
1517 | * statement. Doing so messes up the internal Debug::level | |
1518 | */ | |
04f7fd38 | 1519 | if (DnsSocketB >= 0) { |
e91e2a72 | 1520 | comm_local_port(DnsSocketB); |
055421ee | 1521 | debugs(78, 1, "DNS Socket created at " << addrB << ", FD " << DnsSocketB); |
d841c88d | 1522 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1523 | } |
04f7fd38 | 1524 | if (DnsSocketA >= 0) { |
e91e2a72 | 1525 | comm_local_port(DnsSocketA); |
055421ee | 1526 | debugs(78, 1, "DNS Socket created at " << addrA << ", FD " << DnsSocketA); |
d841c88d | 1527 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1528 | } |
7b724b86 | 1529 | } |
62e76326 | 1530 | |
efd900cb | 1531 | assert(0 == nns); |
1532 | idnsParseNameservers(); | |
1191b93b | 1533 | #if !_SQUID_MSWIN_ |
62e76326 | 1534 | |
efd900cb | 1535 | if (0 == nns) |
62e76326 | 1536 | idnsParseResolvConf(); |
1537 | ||
0e6d05ef | 1538 | #endif |
be266cb2 | 1539 | #if _SQUID_WINDOWS_ |
0e6d05ef | 1540 | if (0 == nns) |
62e76326 | 1541 | idnsParseWIN32Registry(); |
0e6d05ef | 1542 | #endif |
62e76326 | 1543 | |
29fe9bd5 | 1544 | if (0 == nns) { |
1545 | debugs(78, 1, "Warning: Could not find any nameservers. Trying to use localhost"); | |
be266cb2 | 1546 | #if _SQUID_WINDOWS_ |
29fe9bd5 | 1547 | debugs(78, 1, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1548 | #else |
29fe9bd5 | 1549 | debugs(78, 1, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1550 | #endif |
29fe9bd5 | 1551 | |
1552 | debugs(78, 1, "or use the 'dns_nameservers' option in squid.conf."); | |
1553 | idnsAddNameserver("127.0.0.1"); | |
1554 | } | |
62e76326 | 1555 | |
7b724b86 | 1556 | if (!init) { |
62e76326 | 1557 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1558 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1559 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
62e76326 | 1560 | init++; |
7b724b86 | 1561 | } |
372fb44e | 1562 | |
e210930b AJ |
1563 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1564 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1565 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1566 | max_shared_edns = -1; // disable if we might receive random replies. | |
1567 | } | |
1568 | #endif | |
1569 | ||
372fb44e | 1570 | idnsRegisterWithCacheManager(); |
7b724b86 | 1571 | } |
1572 | ||
1573 | void | |
1574 | idnsShutdown(void) | |
1575 | { | |
4d6c8504 | 1576 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1577 | return; |
1578 | ||
04f7fd38 | 1579 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1580 | comm_close(DnsSocketA); |
1581 | DnsSocketA = -1; | |
1582 | } | |
62e76326 | 1583 | |
055421ee | 1584 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1585 | comm_close(DnsSocketB); |
1586 | DnsSocketB = -1; | |
1587 | } | |
62e76326 | 1588 | |
b26754c4 | 1589 | for (int i = 0; i < nns; i++) { |
1590 | if (nsvc *vc = nameservers[i].vc) { | |
00406b24 AJ |
1591 | if (Comm::IsConnOpen(vc->conn)) |
1592 | vc->conn->close(); | |
b26754c4 | 1593 | } |
1594 | } | |
1595 | ||
dd3fb890 | 1596 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1597 | idnsFreeNameservers(); |
68836b58 | 1598 | idnsFreeSearchpath(); |
7b724b86 | 1599 | } |
1600 | ||
3074b9d1 | 1601 | static int |
1602 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1603 | { | |
1604 | idns_query *q; | |
1605 | ||
1606 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1607 | ||
1608 | if (!old) | |
1609 | return 0; | |
1610 | ||
63a0e6b7 | 1611 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1612 | // idns_query is POD so no constructors are called after allocation |
1613 | q->xact_id.change(); | |
3074b9d1 | 1614 | |
1615 | q->callback = callback; | |
1616 | ||
1617 | q->callback_data = cbdataReference(data); | |
1618 | ||
1619 | q->queue = old->queue; | |
1620 | ||
1621 | old->queue = q; | |
1622 | ||
1623 | return 1; | |
1624 | } | |
1625 | ||
1626 | static void | |
9e1f210d | 1627 | idnsCacheQuery(idns_query *q) |
3074b9d1 | 1628 | { |
9e1f210d | 1629 | q->hash.key = q->query.name; |
3074b9d1 | 1630 | hash_join(idns_lookup_hash, &q->hash); |
1631 | } | |
1632 | ||
7b724b86 | 1633 | void |
1634 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1635 | { | |
68836b58 | 1636 | unsigned int i; |
1637 | int nd = 0; | |
3074b9d1 | 1638 | idns_query *q; |
1639 | ||
1640 | if (idnsCachedLookup(name, callback, data)) | |
1641 | return; | |
1642 | ||
63a0e6b7 | 1643 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1644 | // idns_query is POD so no constructors are called after allocation |
1645 | q->xact_id.change(); | |
71952967 | 1646 | |
68836b58 | 1647 | for (i = 0; i < strlen(name); i++) |
1648 | if (name[i] == '.') | |
1649 | nd++; | |
1650 | ||
1651 | if (Config.onoff.res_defnames && npc > 0 && name[strlen(name)-1] != '.') { | |
1652 | q->do_searchpath = 1; | |
1653 | } else { | |
1654 | q->do_searchpath = 0; | |
1655 | } | |
1656 | ||
1657 | strcpy(q->orig, name); | |
1658 | strcpy(q->name, q->orig); | |
1659 | ||
1660 | if (q->do_searchpath && nd < ndots) { | |
1661 | q->domain = 0; | |
1662 | strcat(q->name, "."); | |
1663 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1664 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1665 | } |
1666 | ||
055421ee | 1667 | if (Ip::EnableIpv6) { |
91dcbd43 | 1668 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), 0, &q->query, Config.dns.packet_max); |
055421ee AJ |
1669 | q->need_A = true; |
1670 | } else { | |
e210930b | 1671 | // see EDNS notes at top of file why this sends 0 |
91dcbd43 | 1672 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), 0, &q->query, 0); |
055421ee AJ |
1673 | q->need_A = false; |
1674 | } | |
62e76326 | 1675 | |
2041330b | 1676 | if (q->sz < 0) { |
1677 | /* problem with query data -- query not sent */ | |
1678 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1679 | cbdataFree(q); |
2041330b | 1680 | return; |
1681 | } | |
1682 | ||
26ac0430 | 1683 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
91dcbd43 | 1684 | ", id = 0x" << std::hex << q->msg_id); |
aa6c61e3 | 1685 | |
7b724b86 | 1686 | q->callback = callback; |
fa80a8ef | 1687 | q->callback_data = cbdataReference(data); |
aa6c61e3 | 1688 | |
9e1f210d | 1689 | idnsCacheQuery(q); |
7b724b86 | 1690 | idnsSendQuery(q); |
1691 | } | |
8db71107 | 1692 | |
1693 | void | |
b7ac5457 | 1694 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1695 | { |
3074b9d1 | 1696 | idns_query *q; |
1697 | ||
cc192b50 | 1698 | char ip[MAX_IPSTRLEN]; |
1699 | ||
1700 | addr.NtoA(ip,MAX_IPSTRLEN); | |
3074b9d1 | 1701 | |
63a0e6b7 | 1702 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1703 | |
91dcbd43 CT |
1704 | // idns_query is POD so no constructors are called after allocation |
1705 | q->xact_id.change(); | |
71952967 | 1706 | |
4e6de170 | 1707 | if (addr.IsIPv6()) { |
cc192b50 | 1708 | struct in6_addr addr6; |
1709 | addr.GetInAddr(addr6); | |
91dcbd43 | 1710 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), 0, &q->query, Config.dns.packet_max); |
055421ee | 1711 | } else { |
cc192b50 | 1712 | struct in_addr addr4; |
1713 | addr.GetInAddr(addr4); | |
e210930b | 1714 | // see EDNS notes at top of file why this sends 0 |
91dcbd43 | 1715 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), 0, &q->query, 0); |
cc192b50 | 1716 | } |
1717 | ||
1718 | /* PTR does not do inbound A/AAAA */ | |
1719 | q->need_A = false; | |
3074b9d1 | 1720 | |
26ac0430 | 1721 | if (q->sz < 0) { |
2041330b | 1722 | /* problem with query data -- query not sent */ |
1723 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1724 | cbdataFree(q); |
2041330b | 1725 | return; |
1726 | } | |
1727 | ||
37f3da43 | 1728 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1729 | cbdataFree(q); |
1730 | return; | |
37f3da43 | 1731 | } |
1732 | ||
26ac0430 | 1733 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
91dcbd43 | 1734 | ", id = 0x" << std::hex << q->msg_id); |
3074b9d1 | 1735 | |
8db71107 | 1736 | q->callback = callback; |
fa80a8ef | 1737 | q->callback_data = cbdataReference(data); |
3074b9d1 | 1738 | |
9e1f210d | 1739 | idnsCacheQuery(q); |
8db71107 | 1740 | idnsSendQuery(q); |
1741 | } | |
eb824054 | 1742 | |
59ad6d31 | 1743 | #if SQUID_SNMP |
3c573763 | 1744 | /* |
1745 | * The function to return the DNS via SNMP | |
1746 | */ | |
1747 | variable_list * | |
1748 | snmp_netIdnsFn(variable_list * Var, snint * ErrP) | |
1749 | { | |
1750 | int i, n = 0; | |
1751 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1752 | MemBuf tmp; |
1753 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1754 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1755 | |
3c573763 | 1756 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1757 | |
3c573763 | 1758 | case DNS_REQ: |
62e76326 | 1759 | |
1760 | for (i = 0; i < nns; i++) | |
1761 | n += nameservers[i].nqueries; | |
1762 | ||
1763 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1764 | n, | |
1765 | SMI_COUNTER32); | |
1766 | ||
1767 | break; | |
1768 | ||
3c573763 | 1769 | case DNS_REP: |
62e76326 | 1770 | for (i = 0; i < nns; i++) |
1771 | n += nameservers[i].nreplies; | |
1772 | ||
1773 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1774 | n, | |
1775 | SMI_COUNTER32); | |
1776 | ||
1777 | break; | |
1778 | ||
3c573763 | 1779 | case DNS_SERVERS: |
62e76326 | 1780 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1781 | nns, |
62e76326 | 1782 | SMI_COUNTER32); |
1783 | ||
1784 | break; | |
1785 | ||
3c573763 | 1786 | default: |
62e76326 | 1787 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1788 | ||
1789 | break; | |
3c573763 | 1790 | } |
62e76326 | 1791 | |
3c573763 | 1792 | return Answer; |
1793 | } | |
62e76326 | 1794 | |
3c573763 | 1795 | #endif /*SQUID_SNMP */ |
1f1ae50a | 1796 | #endif /* USE_DNSSERVERS */ |