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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 | ||
582c2af2 FC |
35 | #include "squid.h" |
36 | #include "base/InstanceId.h" | |
55cbb02b | 37 | #include "comm/Connection.h" |
aed188fd | 38 | #include "comm/ConnOpener.h" |
063dc1eb | 39 | #include "comm.h" |
d841c88d AJ |
40 | #include "comm/Loops.h" |
41 | #include "comm/Write.h" | |
cfd66529 | 42 | #include "event.h" |
2c471ba8 | 43 | #include "fde.h" |
055421ee | 44 | #include "ip/tools.h" |
0eb49b6d | 45 | #include "MemBuf.h" |
8822ebee | 46 | #include "mgr/Registration.h" |
582c2af2 FC |
47 | #include "protos.h" |
48 | #include "rfc3596.h" | |
49 | #include "SquidTime.h" | |
50 | #include "Store.h" | |
7176768b | 51 | #include "util.h" |
d295d770 | 52 | #include "wordlist.h" |
68836b58 | 53 | |
54 | #if HAVE_ARPA_NAMESER_H | |
55 | #include <arpa/nameser.h> | |
56 | #endif | |
57 | #if HAVE_RESOLV_H | |
58 | #include <resolv.h> | |
59 | #endif | |
21d845b1 FC |
60 | #if HAVE_ERRNO_H |
61 | #include <errno.h> | |
62 | #endif | |
68836b58 | 63 | |
454e8283 | 64 | /* MS Visual Studio Projects are monolithic, so we need the following |
1f1ae50a | 65 | #ifndef to exclude the internal DNS code from compile process when |
66 | using external DNS process. | |
67 | */ | |
f64091a7 | 68 | #if !USE_DNSHELPER |
be266cb2 | 69 | #if _SQUID_WINDOWS_ |
1a774556 | 70 | #include "squid_windows.h" |
0dde2160 GS |
71 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
72 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
73 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 74 | #endif |
68836b58 | 75 | #ifndef _PATH_RESCONF |
76 | #define _PATH_RESCONF "/etc/resolv.conf" | |
77 | #endif | |
78 | #ifndef NS_DEFAULTPORT | |
79 | #define NS_DEFAULTPORT 53 | |
80 | #endif | |
81 | ||
82 | #ifndef NS_MAXDNAME | |
83 | #define NS_MAXDNAME 1025 | |
84 | #endif | |
85 | ||
86 | #ifndef MAXDNSRCH | |
87 | #define MAXDNSRCH 6 | |
7b724b86 | 88 | #endif |
68836b58 | 89 | |
90 | /* The buffer size required to store the maximum allowed search path */ | |
91 | #ifndef RESOLV_BUFSZ | |
92 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 93 | #endif |
94 | ||
42b51993 | 95 | #define IDNS_MAX_TRIES 20 |
e210930b | 96 | #define MAX_RCODE 17 |
558be27a | 97 | #define MAX_ATTEMPT 3 |
98 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
99 | // NP: see http://www.iana.org/assignments/dns-parameters |
100 | static const char *Rcodes[] = { | |
24520b1b AJ |
101 | /* RFC 1035 */ |
102 | "Success", | |
103 | "Packet Format Error", | |
104 | "DNS Server Failure", | |
105 | "Non-Existent Domain", | |
106 | "Not Implemented", | |
107 | "Query Refused", | |
108 | /* RFC 2136 */ | |
109 | "Name Exists when it should not", | |
110 | "RR Set Exists when it should not", | |
111 | "RR Set that should exist does not", | |
112 | "Server Not Authoritative for zone", | |
113 | "Name not contained in zone", | |
114 | /* unassigned */ | |
115 | "","","","","", | |
116 | /* RFC 2671 */ | |
117 | "Bad OPT Version or TSIG Signature Failure" | |
118 | }; | |
558be27a | 119 | |
58a39dc9 | 120 | typedef struct _idns_query idns_query; |
62e76326 | 121 | |
7b724b86 | 122 | typedef struct _ns ns; |
58a39dc9 | 123 | |
68836b58 | 124 | typedef struct _sp sp; |
125 | ||
d24ef4e9 | 126 | typedef struct _nsvc nsvc; |
127 | ||
26ac0430 | 128 | struct _idns_query { |
3074b9d1 | 129 | hash_link hash; |
9e1f210d | 130 | rfc1035_query query; |
68836b58 | 131 | char buf[RESOLV_BUFSZ]; |
132 | char name[NS_MAXDNAME + 1]; | |
133 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 134 | ssize_t sz; |
049441d9 | 135 | unsigned short query_id; /// random query ID sent to server; changes with every query sent |
13b08e1c | 136 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried |
91dcbd43 | 137 | |
58a39dc9 | 138 | int nsends; |
d24ef4e9 | 139 | int need_vc; |
049441d9 | 140 | int pending; |
62e76326 | 141 | |
58a39dc9 | 142 | struct timeval start_t; |
143 | struct timeval sent_t; | |
820ee9fa | 144 | struct timeval queue_t; |
58a39dc9 | 145 | dlink_node lru; |
146 | IDNSCB *callback; | |
147 | void *callback_data; | |
558be27a | 148 | int attempt; |
7ba8d0b8 | 149 | int rcode; |
3074b9d1 | 150 | idns_query *queue; |
0e6432d0 HN |
151 | idns_query *slave; // single linked list |
152 | idns_query *master; // single pointer to a shared master | |
68836b58 | 153 | unsigned short domain; |
154 | unsigned short do_searchpath; | |
049441d9 HN |
155 | rfc1035_message *message; |
156 | int ancount; | |
33ab4aaf | 157 | const char *error; |
58a39dc9 | 158 | }; |
91dcbd43 | 159 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 160 | |
26ac0430 | 161 | struct _nsvc { |
d24ef4e9 | 162 | int ns; |
00406b24 | 163 | Comm::ConnectionPointer conn; |
d24ef4e9 | 164 | unsigned short msglen; |
165 | int read_msglen; | |
032785bf | 166 | MemBuf *msg; |
167 | MemBuf *queue; | |
d24ef4e9 | 168 | bool busy; |
169 | }; | |
170 | ||
26ac0430 | 171 | struct _ns { |
b7ac5457 | 172 | Ip::Address S; |
7b724b86 | 173 | int nqueries; |
174 | int nreplies; | |
e210930b AJ |
175 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
176 | int last_seen_edns; | |
177 | #endif | |
d24ef4e9 | 178 | nsvc *vc; |
7b724b86 | 179 | }; |
58a39dc9 | 180 | |
26ac0430 | 181 | struct _sp { |
68836b58 | 182 | char domain[NS_MAXDNAME]; |
183 | int queries; | |
184 | }; | |
185 | ||
d24ef4e9 | 186 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 187 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 188 | |
7b724b86 | 189 | static ns *nameservers = NULL; |
68836b58 | 190 | static sp *searchpath = NULL; |
7b724b86 | 191 | static int nns = 0; |
192 | static int nns_alloc = 0; | |
68836b58 | 193 | static int npc = 0; |
194 | static int npc_alloc = 0; | |
195 | static int ndots = 1; | |
7b724b86 | 196 | static dlink_list lru_list; |
7cfc1c9a | 197 | static int event_queued = 0; |
3074b9d1 | 198 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 199 | |
e210930b AJ |
200 | /* |
201 | * Notes on EDNS: | |
202 | * | |
203 | * IPv4: | |
204 | * EDNS as specified may be sent as an additional record for any request. | |
205 | * early testing has revealed that it works on common devices, but cannot | |
206 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
207 | * | |
208 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
209 | * | |
210 | * Squid design: | |
211 | * Squid is optimized to generate one packet and re-send it to all NS | |
212 | * due to this we cannot customize the EDNS size per NS. | |
213 | * | |
214 | * As such we take the configuration option value as fixed. | |
215 | * | |
216 | * FUTURE TODO: | |
217 | * This may not be worth doing, but if/when additional-records are parsed | |
218 | * we will be able to recover the OPT value specific to any one NS and | |
219 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
220 | * size our active NS are capable. | |
221 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
222 | * Responses from the configured NS may cause this to be raised or turned off. | |
223 | */ | |
224 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
225 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
226 | #endif | |
227 | ||
7b724b86 | 228 | static OBJH idnsStats; |
229 | static void idnsAddNameserver(const char *buf); | |
68836b58 | 230 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 231 | static void idnsFreeNameservers(void); |
68836b58 | 232 | static void idnsFreeSearchpath(void); |
efd900cb | 233 | static void idnsParseNameservers(void); |
1191b93b | 234 | #if !_SQUID_MSWIN_ |
7b724b86 | 235 | static void idnsParseResolvConf(void); |
1f1ae50a | 236 | #endif |
be266cb2 | 237 | #if _SQUID_WINDOWS_ |
0e6d05ef | 238 | static void idnsParseWIN32Registry(void); |
d02b72b4 | 239 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 240 | #endif |
33ab4aaf | 241 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 242 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 243 | static IOCB idnsReadVCHeader; |
e0d28505 | 244 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 245 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
246 | static IOCB idnsReadVC; |
247 | static IOCB idnsSentQueryVC; | |
62e76326 | 248 | |
b7ac5457 | 249 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 250 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 251 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 252 | static PF idnsRead; |
7cfc1c9a | 253 | static EVH idnsCheckQueue; |
efd900cb | 254 | static void idnsTickleQueue(void); |
558be27a | 255 | static void idnsRcodeCount(int, int); |
575d05c4 | 256 | static CLCB idnsVCClosed; |
91dcbd43 | 257 | static unsigned short idnsQueryID(void); |
049441d9 | 258 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 259 | |
260 | static void | |
261 | idnsAddNameserver(const char *buf) | |
262 | { | |
b7ac5457 | 263 | Ip::Address A; |
62e76326 | 264 | |
cc192b50 | 265 | if (!(A = buf)) { |
fa84c01d | 266 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 267 | return; |
d20b1cd0 | 268 | } |
62e76326 | 269 | |
cc192b50 | 270 | if (A.IsAnyAddr()) { |
fa84c01d | 271 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
715b5def | 272 | A.SetLocalhost(); |
fa84c01d | 273 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 274 | } |
62e76326 | 275 | |
715b5def AJ |
276 | if (!Ip::EnableIpv6 && !A.SetIPv4()) { |
277 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); | |
278 | return; | |
5c5a349d | 279 | } |
62e76326 | 280 | |
7b724b86 | 281 | if (nns == nns_alloc) { |
62e76326 | 282 | int oldalloc = nns_alloc; |
283 | ns *oldptr = nameservers; | |
284 | ||
285 | if (nns_alloc == 0) | |
286 | nns_alloc = 2; | |
287 | else | |
288 | nns_alloc <<= 1; | |
289 | ||
290 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
291 | ||
292 | if (oldptr && oldalloc) | |
41d00cd3 | 293 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 294 | |
295 | if (oldptr) | |
296 | safe_free(oldptr); | |
7b724b86 | 297 | } |
62e76326 | 298 | |
7b724b86 | 299 | assert(nns < nns_alloc); |
cc192b50 | 300 | A.SetPort(NS_DEFAULTPORT); |
301 | nameservers[nns].S = A; | |
e210930b AJ |
302 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
303 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
304 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
305 | #endif | |
cc192b50 | 306 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 307 | ++nns; |
7b724b86 | 308 | } |
309 | ||
68836b58 | 310 | static void |
311 | idnsAddPathComponent(const char *buf) | |
312 | { | |
313 | if (npc == npc_alloc) { | |
314 | int oldalloc = npc_alloc; | |
315 | sp *oldptr = searchpath; | |
316 | ||
317 | if (0 == npc_alloc) | |
318 | npc_alloc = 2; | |
319 | else | |
320 | npc_alloc <<= 1; | |
321 | ||
322 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
323 | ||
324 | if (oldptr && oldalloc) | |
41d00cd3 | 325 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 326 | |
327 | if (oldptr) | |
328 | safe_free(oldptr); | |
329 | } | |
330 | ||
331 | assert(npc < npc_alloc); | |
332 | strcpy(searchpath[npc].domain, buf); | |
7176768b | 333 | Tolower(searchpath[npc].domain); |
bf8fe701 | 334 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 335 | ++npc; |
68836b58 | 336 | } |
337 | ||
7b724b86 | 338 | static void |
339 | idnsFreeNameservers(void) | |
340 | { | |
341 | safe_free(nameservers); | |
342 | nns = nns_alloc = 0; | |
343 | } | |
344 | ||
68836b58 | 345 | static void |
346 | idnsFreeSearchpath(void) | |
347 | { | |
348 | safe_free(searchpath); | |
349 | npc = npc_alloc = 0; | |
350 | } | |
351 | ||
efd900cb | 352 | static void |
353 | idnsParseNameservers(void) | |
354 | { | |
355 | wordlist *w; | |
62e76326 | 356 | |
efd900cb | 357 | for (w = Config.dns_nameservers; w; w = w->next) { |
e0236918 | 358 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 359 | idnsAddNameserver(w->key); |
efd900cb | 360 | } |
361 | } | |
362 | ||
1191b93b | 363 | #if !_SQUID_MSWIN_ |
7b724b86 | 364 | static void |
365 | idnsParseResolvConf(void) | |
366 | { | |
367 | FILE *fp; | |
68836b58 | 368 | char buf[RESOLV_BUFSZ]; |
a083e75a | 369 | const char *t; |
68836b58 | 370 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 371 | |
7b724b86 | 372 | if (fp == NULL) { |
e0236918 | 373 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
62e76326 | 374 | return; |
7b724b86 | 375 | } |
62e76326 | 376 | |
be266cb2 | 377 | #if _SQUID_CYGWIN_ |
c4aefe96 | 378 | setmode(fileno(fp), O_TEXT); |
379 | #endif | |
62e76326 | 380 | |
68836b58 | 381 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 382 | t = strtok(buf, w_space); |
383 | ||
68836b58 | 384 | if (NULL == t) { |
62e76326 | 385 | continue; |
68836b58 | 386 | } else if (strcasecmp(t, "nameserver") == 0) { |
387 | t = strtok(NULL, w_space); | |
62e76326 | 388 | |
68836b58 | 389 | if (NULL == t) |
390 | continue; | |
62e76326 | 391 | |
e0236918 | 392 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 393 | |
68836b58 | 394 | idnsAddNameserver(t); |
a083e75a | 395 | } else if (strcasecmp(t, "domain") == 0) { |
26ac0430 AJ |
396 | idnsFreeSearchpath(); |
397 | t = strtok(NULL, w_space); | |
a083e75a | 398 | |
26ac0430 AJ |
399 | if (NULL == t) |
400 | continue; | |
a083e75a | 401 | |
e0236918 | 402 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 403 | |
26ac0430 | 404 | idnsAddPathComponent(t); |
68836b58 | 405 | } else if (strcasecmp(t, "search") == 0) { |
26ac0430 | 406 | idnsFreeSearchpath(); |
68836b58 | 407 | while (NULL != t) { |
408 | t = strtok(NULL, w_space); | |
409 | ||
410 | if (NULL == t) | |
411 | continue; | |
412 | ||
e0236918 | 413 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 414 | |
415 | idnsAddPathComponent(t); | |
416 | } | |
417 | } else if (strcasecmp(t, "options") == 0) { | |
418 | while (NULL != t) { | |
419 | t = strtok(NULL, w_space); | |
62e76326 | 420 | |
68836b58 | 421 | if (NULL == t) |
422 | continue; | |
62e76326 | 423 | |
2c2da7d3 | 424 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 425 | ndots = atoi(t + 6); |
426 | ||
427 | if (ndots < 1) | |
428 | ndots = 1; | |
429 | ||
e0236918 | 430 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 431 | } |
432 | } | |
433 | } | |
7b724b86 | 434 | } |
a083e75a | 435 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
436 | t = strchr(t, '.'); |
437 | if (t) | |
438 | idnsAddPathComponent(t+1); | |
a083e75a | 439 | } |
62e76326 | 440 | |
7b724b86 | 441 | fclose(fp); |
442 | } | |
443 | ||
1f1ae50a | 444 | #endif |
445 | ||
be266cb2 | 446 | #if _SQUID_WINDOWS_ |
6b610e34 | 447 | static void |
d02b72b4 | 448 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 449 | { |
a16cb11f | 450 | char *t; |
6b610e34 | 451 | char *token; |
452 | HKEY hndKey; | |
453 | ||
0dde2160 | 454 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 455 | DWORD Type = 0; |
456 | DWORD Size = 0; | |
457 | LONG Result; | |
04f7fd38 | 458 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
459 | |
460 | if (Result == ERROR_SUCCESS && Size) { | |
461 | t = (char *) xmalloc(Size); | |
0dde2160 | 462 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 463 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
464 | idnsAddPathComponent(t); |
465 | xfree(t); | |
466 | } | |
04f7fd38 | 467 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 468 | |
469 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 470 | t = (char *) xmalloc(Size); |
04f7fd38 | 471 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 472 | token = strtok(t, Separator); |
6b610e34 | 473 | |
474 | while (token) { | |
475 | idnsAddPathComponent(token); | |
e0236918 | 476 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 477 | token = strtok(NULL, Separator); |
478 | } | |
26ac0430 | 479 | xfree(t); |
6b610e34 | 480 | } |
481 | ||
482 | RegCloseKey(hndKey); | |
483 | } | |
a6cae565 | 484 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
485 | t = strchr(t, '.'); |
486 | if (t) | |
487 | idnsAddPathComponent(t + 1); | |
a16cb11f | 488 | } |
6b610e34 | 489 | } |
490 | ||
0e6d05ef | 491 | static void |
492 | idnsParseWIN32Registry(void) | |
493 | { | |
a16cb11f | 494 | char *t; |
0e6d05ef | 495 | char *token; |
496 | HKEY hndKey, hndKey2; | |
497 | ||
0e6d05ef | 498 | switch (WIN32_OS_version) { |
62e76326 | 499 | |
0e6d05ef | 500 | case _WIN_OS_WINNT: |
62e76326 | 501 | /* get nameservers from the Windows NT registry */ |
502 | ||
04f7fd38 | 503 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 504 | DWORD Type = 0; |
505 | DWORD Size = 0; | |
506 | LONG Result; | |
04f7fd38 | 507 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 508 | |
509 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 510 | t = (char *) xmalloc(Size); |
0dde2160 | 511 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 512 | token = strtok(t, ", "); |
62e76326 | 513 | |
514 | while (token) { | |
515 | idnsAddNameserver(token); | |
e0236918 | 516 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 517 | token = strtok(NULL, ","); |
62e76326 | 518 | } |
26ac0430 | 519 | xfree(t); |
62e76326 | 520 | } |
521 | ||
0dde2160 | 522 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 523 | |
524 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 525 | t = (char *) xmalloc(Size); |
a6cae565 | 526 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 527 | token = strtok(t, ", "); |
62e76326 | 528 | |
529 | while (token) { | |
e0236918 | 530 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 531 | idnsAddNameserver(token); |
532 | token = strtok(NULL, ", "); | |
533 | } | |
26ac0430 | 534 | xfree(t); |
62e76326 | 535 | } |
536 | ||
537 | RegCloseKey(hndKey); | |
538 | } | |
539 | ||
6b610e34 | 540 | idnsParseWIN32SearchList(" "); |
541 | ||
62e76326 | 542 | break; |
543 | ||
0e6d05ef | 544 | case _WIN_OS_WIN2K: |
62e76326 | 545 | |
b671cc68 | 546 | case _WIN_OS_WINXP: |
62e76326 | 547 | |
6b1846cf | 548 | case _WIN_OS_WINNET: |
28170269 | 549 | |
550 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
551 | |
552 | case _WIN_OS_WIN7: | |
62e76326 | 553 | /* get nameservers from the Windows 2000 registry */ |
554 | /* search all interfaces for DNS server addresses */ | |
555 | ||
04f7fd38 | 556 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 557 | int i; |
04f7fd38 AJ |
558 | DWORD MaxSubkeyLen, InterfacesCount; |
559 | char *keyname; | |
560 | FILETIME ftLastWriteTime; | |
561 | ||
562 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
563 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 564 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
565 | DWORD j; |
566 | j = MaxSubkeyLen; | |
567 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
568 | char *newkeyname; | |
569 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
570 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
571 | strcat(newkeyname, "\\"); | |
572 | strcat(newkeyname, keyname); | |
573 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
574 | DWORD Type = 0; | |
575 | DWORD Size = 0; | |
576 | LONG Result; | |
577 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
578 | if (Result == ERROR_SUCCESS && Size) { | |
579 | t = (char *) xmalloc(Size); | |
580 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
581 | token = strtok(t, ", "); | |
582 | while (token) { | |
e0236918 | 583 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 AJ |
584 | idnsAddNameserver(token); |
585 | token = strtok(NULL, ", "); | |
586 | } | |
587 | xfree(t); | |
588 | } | |
589 | ||
590 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
591 | if (Result == ERROR_SUCCESS && Size) { | |
592 | t = (char *) xmalloc(Size); | |
593 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
594 | token = strtok(t, ", "); | |
595 | while (token) { | |
e0236918 | 596 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 AJ |
597 | idnsAddNameserver(token); |
598 | token = strtok(NULL, ", "); | |
599 | } | |
600 | ||
601 | xfree(t); | |
62e76326 | 602 | } |
62e76326 | 603 | |
0dde2160 | 604 | RegCloseKey(hndKey2); |
62e76326 | 605 | } |
606 | ||
04f7fd38 | 607 | xfree(newkeyname); |
62e76326 | 608 | } |
609 | } | |
0dde2160 | 610 | |
04f7fd38 | 611 | xfree(keyname); |
62e76326 | 612 | } |
613 | ||
614 | RegCloseKey(hndKey); | |
615 | } | |
616 | ||
6b610e34 | 617 | idnsParseWIN32SearchList(", "); |
618 | ||
62e76326 | 619 | break; |
620 | ||
0e6d05ef | 621 | case _WIN_OS_WIN95: |
62e76326 | 622 | |
0e6d05ef | 623 | case _WIN_OS_WIN98: |
62e76326 | 624 | |
be20dac7 | 625 | case _WIN_OS_WINME: |
62e76326 | 626 | /* get nameservers from the Windows 9X registry */ |
627 | ||
04f7fd38 | 628 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 629 | DWORD Type = 0; |
630 | DWORD Size = 0; | |
631 | LONG Result; | |
04f7fd38 | 632 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 633 | |
634 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 635 | t = (char *) xmalloc(Size); |
a6cae565 | 636 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 637 | token = strtok(t, ", "); |
62e76326 | 638 | |
639 | while (token) { | |
e0236918 | 640 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 641 | idnsAddNameserver(token); |
642 | token = strtok(NULL, ", "); | |
643 | } | |
26ac0430 | 644 | xfree(t); |
62e76326 | 645 | } |
646 | ||
647 | RegCloseKey(hndKey); | |
648 | } | |
649 | ||
650 | break; | |
651 | ||
0e6d05ef | 652 | default: |
e0236918 | 653 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
62e76326 | 654 | return; |
0e6d05ef | 655 | } |
656 | } | |
62e76326 | 657 | |
0e6d05ef | 658 | #endif |
659 | ||
7b724b86 | 660 | static void |
661 | idnsStats(StoreEntry * sentry) | |
662 | { | |
a16b4aa0 | 663 | dlink_node *n; |
664 | idns_query *q; | |
7cfc1c9a | 665 | int i; |
558be27a | 666 | int j; |
cc192b50 | 667 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 668 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 669 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 670 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
671 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND\n"); | |
672 | storeAppendPrintf(sentry, "------ ---- ----- ---------- ---------\n"); | |
62e76326 | 673 | |
a16b4aa0 | 674 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 675 | q = (idns_query *)n->data; |
676 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f\n", | |
049441d9 | 677 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 678 | tvSubDsec(q->start_t, current_time), |
679 | tvSubDsec(q->sent_t, current_time)); | |
7cfc1c9a | 680 | } |
62e76326 | 681 | |
e210930b | 682 | if (Config.dns.packet_max > 0) |
d8b258a9 | 683 | storeAppendPrintf(sentry, "DNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b AJ |
684 | else |
685 | storeAppendPrintf(sentry, "DNS jumbo-grams: not working\n"); | |
686 | ||
7cfc1c9a | 687 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
cc192b50 | 688 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES\n"); |
689 | storeAppendPrintf(sentry, "---------------------------------------------- --------- ---------\n"); | |
62e76326 | 690 | |
95dc7ff4 | 691 | for (i = 0; i < nns; ++i) { |
cc192b50 | 692 | storeAppendPrintf(sentry, "%-45s %9d %9d\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
693 | nameservers[i].S.NtoA(buf,MAX_IPSTRLEN), | |
62e76326 | 694 | nameservers[i].nqueries, |
695 | nameservers[i].nreplies); | |
a16b4aa0 | 696 | } |
62e76326 | 697 | |
558be27a | 698 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
699 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 700 | |
95dc7ff4 | 701 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 702 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
703 | ||
e210930b | 704 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 705 | |
95dc7ff4 | 706 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
707 | if (j > 10 && j < 16) |
708 | continue; // unassigned by IANA. | |
709 | ||
62e76326 | 710 | storeAppendPrintf(sentry, "%5d", j); |
711 | ||
95dc7ff4 | 712 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 713 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
714 | ||
e210930b | 715 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 716 | } |
6b610e34 | 717 | |
718 | if (npc) { | |
719 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
720 | ||
95dc7ff4 | 721 | for (i=0; i < npc; ++i) |
6b610e34 | 722 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
723 | ||
724 | storeAppendPrintf(sentry, "\n"); | |
725 | } | |
7b724b86 | 726 | } |
727 | ||
efd900cb | 728 | static void |
729 | idnsTickleQueue(void) | |
730 | { | |
731 | if (event_queued) | |
62e76326 | 732 | return; |
733 | ||
efd900cb | 734 | if (NULL == lru_list.tail) |
62e76326 | 735 | return; |
736 | ||
fd0f51c4 CT |
737 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
738 | ||
739 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 740 | |
efd900cb | 741 | event_queued = 1; |
742 | } | |
743 | ||
d24ef4e9 | 744 | static void |
e0d28505 | 745 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *buf, size_t size, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 746 | { |
747 | nsvc * vc = (nsvc *)data; | |
748 | ||
749 | if (flag == COMM_ERR_CLOSING) | |
750 | return; | |
af6a12ee | 751 | |
e0d28505 AJ |
752 | // XXX: irrelevant now that we have conn pointer? |
753 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 754 | return; |
d24ef4e9 | 755 | |
756 | if (flag != COMM_OK || size <= 0) { | |
80463bb4 | 757 | conn->close(); |
d24ef4e9 | 758 | return; |
759 | } | |
760 | ||
761 | vc->busy = 0; | |
762 | idnsDoSendQueryVC(vc); | |
763 | } | |
764 | ||
765 | static void | |
766 | idnsDoSendQueryVC(nsvc *vc) | |
767 | { | |
768 | if (vc->busy) | |
769 | return; | |
770 | ||
032785bf | 771 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 772 | return; |
773 | ||
8401d6fc AR |
774 | // if retrying after a TC UDP response, our close handler cb may be pending |
775 | if (fd_table[vc->conn->fd].closing()) | |
776 | return; | |
777 | ||
032785bf | 778 | MemBuf *mb = vc->queue; |
d24ef4e9 | 779 | |
032785bf | 780 | vc->queue = new MemBuf; |
d24ef4e9 | 781 | |
782 | vc->busy = 1; | |
783 | ||
fd0f51c4 | 784 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
785 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
786 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 787 | AsyncCall::Pointer nil; |
d4b21972 | 788 | |
1b76e6c1 | 789 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 790 | |
ec41b64c AJ |
791 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
792 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 793 | Comm::Write(vc->conn, mb, call); |
032785bf | 794 | |
795 | delete mb; | |
d24ef4e9 | 796 | } |
797 | ||
798 | static void | |
00406b24 | 799 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, comm_err_t status, int xerrno, void *data) |
d24ef4e9 | 800 | { |
801 | nsvc * vc = (nsvc *)data; | |
802 | ||
cfd66529 | 803 | if (status != COMM_OK || !conn) { |
dd3fb890 AR |
804 | char buf[MAX_IPSTRLEN] = ""; |
805 | if (vc->ns < nns) | |
806 | nameservers[vc->ns].S.NtoA(buf,MAX_IPSTRLEN); | |
e0236918 | 807 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 808 | return; |
809 | } | |
810 | ||
00406b24 | 811 | vc->conn = conn; |
cfd66529 AJ |
812 | |
813 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
814 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
815 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
816 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 817 | vc->busy = 0; |
818 | idnsDoSendQueryVC(vc); | |
819 | } | |
820 | ||
821 | static void | |
575d05c4 | 822 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 823 | { |
575d05c4 | 824 | nsvc * vc = (nsvc *)params.data; |
032785bf | 825 | delete vc->queue; |
826 | delete vc->msg; | |
00406b24 | 827 | vc->conn = NULL; |
f64091a7 | 828 | if (vc->ns < nns) // XXX: dnsShutdown may have freed nameservers[] |
dd3fb890 | 829 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 830 | cbdataFree(vc); |
d24ef4e9 | 831 | } |
832 | ||
833 | static void | |
834 | idnsInitVC(int ns) | |
835 | { | |
836 | nsvc *vc = cbdataAlloc(nsvc); | |
dd3fb890 | 837 | assert(ns < nns); |
00406b24 | 838 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
d24ef4e9 | 839 | nameservers[ns].vc = vc; |
445962f3 | 840 | vc->ns = ns; |
032785bf | 841 | vc->queue = new MemBuf; |
032785bf | 842 | vc->msg = new MemBuf; |
cfd66529 | 843 | vc->busy = 1; |
d24ef4e9 | 844 | |
00406b24 | 845 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 AJ |
846 | |
847 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) | |
848 | conn->local = Config.Addrs.udp_outgoing; | |
849 | else | |
850 | conn->local = Config.Addrs.udp_incoming; | |
851 | ||
cfd66529 | 852 | conn->remote = nameservers[ns].S; |
d24ef4e9 | 853 | |
f5ba22ff AJ |
854 | if (conn->remote.IsIPv4()) { |
855 | conn->local.SetIPv4(); | |
856 | } | |
857 | ||
cfd66529 | 858 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 859 | |
4accd6d8 | 860 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 861 | cs->setHost("DNS TCP Socket"); |
855150a4 | 862 | AsyncJob::Start(cs); |
d24ef4e9 | 863 | } |
864 | ||
865 | static void | |
866 | idnsSendQueryVC(idns_query * q, int ns) | |
867 | { | |
dd3fb890 | 868 | assert(ns < nns); |
d24ef4e9 | 869 | if (nameservers[ns].vc == NULL) |
870 | idnsInitVC(ns); | |
871 | ||
872 | nsvc *vc = nameservers[ns].vc; | |
873 | ||
445962f3 HN |
874 | if (!vc) { |
875 | char buf[MAX_IPSTRLEN]; | |
e0236918 | 876 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[ns].S.NtoA(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
877 | |
878 | return; | |
879 | } | |
880 | ||
2fe7eff9 | 881 | vc->queue->reset(); |
d24ef4e9 | 882 | |
883 | short head = htons(q->sz); | |
884 | ||
2fe7eff9 | 885 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 886 | |
2fe7eff9 | 887 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 888 | |
889 | idnsDoSendQueryVC(vc); | |
890 | } | |
891 | ||
7b724b86 | 892 | static void |
893 | idnsSendQuery(idns_query * q) | |
894 | { | |
4d6c8504 | 895 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 896 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 897 | return; |
0a69973e | 898 | } |
62e76326 | 899 | |
cc192b50 | 900 | if (nns <= 0) { |
e0236918 | 901 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 902 | return; |
903 | } | |
62e76326 | 904 | |
7b724b86 | 905 | assert(q->lru.next == NULL); |
62e76326 | 906 | |
7b724b86 | 907 | assert(q->lru.prev == NULL); |
62e76326 | 908 | |
4d6c8504 AJ |
909 | int x = -1, y = -1; |
910 | int ns; | |
911 | ||
213b6c90 AJ |
912 | do { |
913 | ns = q->nsends % nns; | |
914 | ||
915 | if (q->need_vc) { | |
916 | idnsSendQueryVC(q, ns); | |
4d6c8504 | 917 | x = y = 0; |
213b6c90 | 918 | } else { |
055421ee | 919 | if (DnsSocketB >= 0 && nameservers[ns].S.IsIPv6()) |
4d6c8504 | 920 | y = comm_udp_sendto(DnsSocketB, nameservers[ns].S, q->buf, q->sz); |
049441d9 | 921 | else if (DnsSocketA >= 0) |
4d6c8504 | 922 | x = comm_udp_sendto(DnsSocketA, nameservers[ns].S, q->buf, q->sz); |
213b6c90 | 923 | } |
62e76326 | 924 | |
95dc7ff4 | 925 | ++ q->nsends; |
62e76326 | 926 | |
33ab4aaf | 927 | q->sent_t = current_time; |
62e76326 | 928 | |
4d6c8504 | 929 | if (y < 0 && nameservers[ns].S.IsIPv6()) |
e0236918 | 930 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4d6c8504 | 931 | if (x < 0 && nameservers[ns].S.IsIPv4()) |
e0236918 | 932 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
933 | |
934 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 935 | |
bd6a0c8f | 936 | if (y > 0) { |
4d6c8504 | 937 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 938 | } |
bd6a0c8f | 939 | if (x > 0) { |
4d6c8504 | 940 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 941 | } |
62e76326 | 942 | |
95dc7ff4 | 943 | ++ nameservers[ns].nqueries; |
c131f066 | 944 | q->queue_t = current_time; |
7b724b86 | 945 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 946 | q->pending = 1; |
efd900cb | 947 | idnsTickleQueue(); |
7b724b86 | 948 | } |
949 | ||
950 | static int | |
b7ac5457 | 951 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 952 | { |
953 | int i; | |
62e76326 | 954 | |
95dc7ff4 | 955 | for (i = 0; i < nns; ++i) { |
cc192b50 | 956 | if (nameservers[i].S != from) |
62e76326 | 957 | continue; |
958 | ||
cc192b50 | 959 | if (nameservers[i].S.GetPort() != from.GetPort()) |
62e76326 | 960 | continue; |
961 | ||
962 | return i; | |
7b724b86 | 963 | } |
62e76326 | 964 | |
7cfc1c9a | 965 | return -1; |
7b724b86 | 966 | } |
967 | ||
968 | static idns_query * | |
969 | idnsFindQuery(unsigned short id) | |
970 | { | |
971 | dlink_node *n; | |
972 | idns_query *q; | |
62e76326 | 973 | |
7b724b86 | 974 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 975 | q = (idns_query*)n->data; |
976 | ||
049441d9 | 977 | if (q->query_id == id) |
62e76326 | 978 | return q; |
7b724b86 | 979 | } |
62e76326 | 980 | |
7b724b86 | 981 | return NULL; |
982 | } | |
983 | ||
108d67a0 | 984 | static unsigned short |
985 | idnsQueryID(void) | |
986 | { | |
987 | unsigned short id = squid_random() & 0xFFFF; | |
988 | unsigned short first_id = id; | |
989 | ||
26ac0430 | 990 | while (idnsFindQuery(id)) { |
95dc7ff4 | 991 | ++id; |
108d67a0 | 992 | |
846c8960 | 993 | if (id == first_id) { |
e0236918 | 994 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 995 | break; |
846c8960 | 996 | } |
108d67a0 | 997 | } |
998 | ||
846c8960 | 999 | return id; |
108d67a0 | 1000 | } |
1001 | ||
3074b9d1 | 1002 | static void |
33ab4aaf | 1003 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1004 | { |
1005 | IDNSCB *callback; | |
1006 | void *cbdata; | |
1007 | ||
33ab4aaf HN |
1008 | if (error) |
1009 | q->error = error; | |
1010 | ||
1011 | if (q->master) | |
1012 | q = q->master; | |
1013 | ||
1014 | idns_query *q2; | |
1015 | // If any of our subqueries are still pending then wait for them to complete before continuing | |
1016 | for ( q2 = q; q2; q2 = q2->slave) { | |
1017 | if (q2->pending) { | |
1018 | return; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* Merge results */ | |
1023 | rfc1035_message *message = q->message; | |
1024 | q->message = NULL; | |
1025 | int n = q->ancount; | |
1026 | error = q->error; | |
1027 | ||
1028 | while ( (q2 = q->slave) ) { | |
1029 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); | |
1030 | q->slave = q2->slave; | |
1031 | if ( !q2->error ) { | |
1032 | if (n > 0) { | |
1033 | // two sets of RR need merging | |
1034 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1035 | if (Config.dns.v4_first) { | |
1036 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1037 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1038 | } else { | |
1039 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1040 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1041 | } | |
1042 | n += q2->ancount; | |
1043 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1044 | // result, do not free them here | |
1045 | safe_free(message->answer); | |
1046 | safe_free(q2->message->answer); | |
1047 | message->answer = result; | |
1048 | message->ancount += q2->message->ancount; | |
1049 | } else { | |
1050 | // first response empty or failed, just use the second | |
1051 | rfc1035MessageDestroy(&message); | |
1052 | message = q2->message; | |
1053 | q2->message = NULL; | |
1054 | n = q2->ancount; | |
1055 | error = NULL; | |
1056 | } | |
1057 | } | |
1058 | rfc1035MessageDestroy(&q2->message); | |
1059 | cbdataFree(q2); | |
1060 | } | |
1061 | ||
1062 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1063 | ||
3074b9d1 | 1064 | callback = q->callback; |
1065 | q->callback = NULL; | |
33ab4aaf | 1066 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1067 | |
1068 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1069 | callback(cbdata, answers, n, error); | |
1070 | ||
26ac0430 | 1071 | while (q->queue) { |
3074b9d1 | 1072 | idns_query *q2 = q->queue; |
1073 | q->queue = q2->queue; | |
1074 | callback = q2->callback; | |
1075 | q2->callback = NULL; | |
1076 | ||
1077 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1078 | callback(cbdata, answers, n, error); | |
1079 | ||
63a0e6b7 | 1080 | cbdataFree(q2); |
3074b9d1 | 1081 | } |
1082 | ||
1083 | if (q->hash.key) { | |
1084 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1085 | q->hash.key = NULL; | |
1086 | } | |
33ab4aaf HN |
1087 | |
1088 | rfc1035MessageDestroy(&message); | |
1089 | cbdataFree(q); | |
3074b9d1 | 1090 | } |
1091 | ||
7b724b86 | 1092 | static void |
e210930b | 1093 | idnsGrokReply(const char *buf, size_t sz, int from_ns) |
7b724b86 | 1094 | { |
1095 | int n; | |
ec7bade0 | 1096 | rfc1035_message *message = NULL; |
7b724b86 | 1097 | idns_query *q; |
3074b9d1 | 1098 | |
cc192b50 | 1099 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1100 | |
ec7bade0 | 1101 | if (message == NULL) { |
e0236918 | 1102 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1103 | return; |
7b724b86 | 1104 | } |
62e76326 | 1105 | |
91dcbd43 | 1106 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1107 | |
1108 | q = idnsFindQuery(message->id); | |
1109 | ||
7b724b86 | 1110 | if (q == NULL) { |
bf8fe701 | 1111 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1112 | rfc1035MessageDestroy(&message); |
62e76326 | 1113 | return; |
7b724b86 | 1114 | } |
62e76326 | 1115 | |
9e1f210d | 1116 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1117 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1118 | rfc1035MessageDestroy(&message); |
9e1f210d | 1119 | return; |
1120 | } | |
1121 | ||
e210930b AJ |
1122 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1123 | // TODO: actually gr the message right here. | |
1124 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q | |
1125 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1126 | // AND allows us to merge AN+AR sections from both responses (one day) | |
1127 | ||
1128 | if (q->edns_seen >= 0) { | |
1129 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1130 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1131 | // the altered NS was limiting the whole group. | |
1132 | max_shared_edns = q->edns_seen; | |
1133 | // may be limited by one of the others still | |
95dc7ff4 | 1134 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1135 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1136 | } else { | |
1137 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1138 | // maybe reduce the global limit downwards to accomodate this NS | |
1139 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1140 | } | |
1141 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1142 | max_shared_edns = -1; | |
1143 | } | |
1144 | #endif | |
1145 | ||
049441d9 HN |
1146 | dlinkDelete(&q->lru, &lru_list); |
1147 | q->pending = 0; | |
1148 | ||
d24ef4e9 | 1149 | if (message->tc) { |
bae9832d | 1150 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1151 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1152 | |
1153 | if (!q->need_vc) { | |
1154 | q->need_vc = 1; | |
5e263176 | 1155 | -- q->nsends; |
d24ef4e9 | 1156 | idnsSendQuery(q); |
91dcbd43 CT |
1157 | } else { |
1158 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1159 | // Return an error and cleanup; no point in trying TCP again. | |
1160 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1161 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1162 | } |
1163 | ||
1164 | return; | |
1165 | } | |
9e1f210d | 1166 | |
558be27a | 1167 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1168 | |
558be27a | 1169 | if (n < 0) { |
7ba8d0b8 | 1170 | q->rcode = -n; |
42687bb2 | 1171 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1172 | |
95dc7ff4 | 1173 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1174 | /* |
1175 | * RCODE 2 is "Server failure - The name server was | |
1176 | * unable to process this query due to a problem with | |
1177 | * the name server." | |
1178 | */ | |
cc192b50 | 1179 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1180 | rfc1035MessageDestroy(&message); | |
62e76326 | 1181 | idnsSendQuery(q); |
1182 | return; | |
1183 | } | |
68836b58 | 1184 | |
0e6432d0 HN |
1185 | // Do searchpath processing on the master A query only to keep |
1186 | // things simple. NXDOMAIN is authorative for the label, not | |
1187 | // the record type. | |
049441d9 | 1188 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1189 | assert(NULL == message->answer); |
1190 | strcpy(q->name, q->orig); | |
1191 | ||
cc192b50 | 1192 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1193 | ||
68836b58 | 1194 | if (q->domain < npc) { |
1195 | strcat(q->name, "."); | |
1196 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1197 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1198 | ++ q->domain; |
68836b58 | 1199 | } else { |
95dc7ff4 | 1200 | ++ q->attempt; |
68836b58 | 1201 | } |
1202 | ||
049441d9 | 1203 | rfc1035MessageDestroy(&message); |
cc192b50 | 1204 | |
33ab4aaf | 1205 | // cleanup slave AAAA query |
049441d9 HN |
1206 | while (idns_query *slave = q->slave) { |
1207 | dlinkDelete(&slave->lru, &lru_list); | |
1208 | q->slave = slave->slave; | |
1209 | rfc1035MessageDestroy(&slave->message); | |
1210 | cbdataFree(slave); | |
cc192b50 | 1211 | } |
c7ba545e | 1212 | |
049441d9 HN |
1213 | // Build new query |
1214 | q->query_id = idnsQueryID(); | |
1215 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1216 | // see EDNS notes at top of file why this sends 0 | |
1217 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1218 | if (q->sz < 0) { |
1219 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1220 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1221 | return; |
1222 | } | |
1223 | ||
33ab4aaf HN |
1224 | q->nsends = 0; |
1225 | ||
68836b58 | 1226 | idnsSendQuery(q); |
049441d9 HN |
1227 | if (Ip::EnableIpv6) |
1228 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1229 | return; |
1230 | } | |
558be27a | 1231 | } |
62e76326 | 1232 | |
049441d9 HN |
1233 | q->message = message; |
1234 | q->ancount = n; | |
cc192b50 | 1235 | |
33ab4aaf HN |
1236 | if (n >= 0) |
1237 | idnsCallback(q, NULL); | |
1238 | else | |
1239 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1240 | |
7b724b86 | 1241 | } |
1242 | ||
1243 | static void | |
1244 | idnsRead(int fd, void *data) | |
1245 | { | |
d193a436 | 1246 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1247 | int len; |
42b51993 | 1248 | int max = INCOMING_DNS_MAX; |
d29b40de | 1249 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
7cfc1c9a | 1250 | int ns; |
b7ac5457 | 1251 | Ip::Address from; |
cc192b50 | 1252 | |
d7e7eaa7 | 1253 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1254 | |
bd6a0c8f HN |
1255 | // Always keep reading. This stops (or at least makes harder) several |
1256 | // attacks on the DNS client. | |
d841c88d | 1257 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1258 | |
cc192b50 | 1259 | /* BUG (UNRESOLVED) |
1260 | * two code lines after returning from comm_udprecvfrom() | |
1261 | * something overwrites the memory behind the from parameter. | |
1262 | * NO matter where in the stack declaration list above it is placed | |
1263 | * The cause of this is still unknown, however copying the data appears | |
1264 | * to allow it to be passed further without this erasure. | |
1265 | */ | |
b7ac5457 | 1266 | Ip::Address bugbypass; |
62e76326 | 1267 | |
5e263176 FC |
1268 | while (max) { |
1269 | --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 | |
e0236918 | 1289 | debugs(50, DBG_IMPORTANT, "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); |
aec55359 | 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) { | |
95dc7ff4 | 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) { | |
e0236918 | 1317 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1318 | last_warning = squid_curtime; |
26ac0430 | 1319 | } else { |
e0236918 | 1320 | debugs(78, DBG_IMPORTANT, "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 | |
33ab4aaf | 1350 | /* Query timer still running? */ |
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') << | |
049441d9 | 1360 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1361 | |
1362 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1363 | q->pending = 0; |
62e76326 | 1364 | |
fd0f51c4 | 1365 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1366 | idnsSendQuery(q); |
1367 | } else { | |
91dcbd43 | 1368 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1369 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1370 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1371 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1372 | |
1373 | if (q->rcode != 0) | |
33ab4aaf | 1374 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1375 | else |
33ab4aaf | 1376 | idnsCallback(q, "Timeout"); |
62e76326 | 1377 | } |
7cfc1c9a | 1378 | } |
62e76326 | 1379 | |
efd900cb | 1380 | idnsTickleQueue(); |
7cfc1c9a | 1381 | } |
1382 | ||
d24ef4e9 | 1383 | static void |
e0d28505 | 1384 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1385 | { |
1386 | nsvc * vc = (nsvc *)data; | |
1387 | ||
1388 | if (flag == COMM_ERR_CLOSING) | |
1389 | return; | |
1390 | ||
1391 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1392 | if (Comm::IsConnOpen(conn)) |
1393 | conn->close(); | |
d24ef4e9 | 1394 | return; |
1395 | } | |
1396 | ||
bd6a0c8f | 1397 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1398 | |
032785bf | 1399 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1400 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1401 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1402 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1403 | return; |
1404 | } | |
1405 | ||
dd3fb890 | 1406 | assert(vc->ns < nns); |
e0d28505 | 1407 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1408 | |
e210930b | 1409 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1410 | vc->msg->clean(); |
abd8f140 AJ |
1411 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1412 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1413 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1414 | } |
1415 | ||
1416 | static void | |
e0d28505 | 1417 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1418 | { |
1419 | nsvc * vc = (nsvc *)data; | |
1420 | ||
1421 | if (flag == COMM_ERR_CLOSING) | |
1422 | return; | |
1423 | ||
1424 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1425 | if (Comm::IsConnOpen(conn)) |
1426 | conn->close(); | |
d24ef4e9 | 1427 | return; |
1428 | } | |
1429 | ||
1430 | vc->read_msglen += len; | |
1431 | ||
1432 | assert(vc->read_msglen <= 2); | |
1433 | ||
1434 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1435 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1436 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1437 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1438 | return; |
1439 | } | |
1440 | ||
1441 | vc->read_msglen = 0; | |
1442 | ||
1443 | vc->msglen = ntohs(vc->msglen); | |
1444 | ||
2fe7eff9 | 1445 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1446 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1447 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1448 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1449 | } |
1450 | ||
558be27a | 1451 | /* |
1452 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1453 | */ | |
1454 | static void | |
1455 | idnsRcodeCount(int rcode, int attempt) | |
1456 | { | |
1457 | if (rcode > 0) | |
62e76326 | 1458 | rcode = 0; |
558be27a | 1459 | else if (rcode < 0) |
62e76326 | 1460 | rcode = -rcode; |
1461 | ||
558be27a | 1462 | if (rcode < MAX_RCODE) |
62e76326 | 1463 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1464 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1465 | } |
1466 | ||
7b724b86 | 1467 | /* ====================================================================== */ |
1468 | ||
5f5e883f FC |
1469 | static void |
1470 | idnsRegisterWithCacheManager(void) | |
1471 | { | |
8822ebee | 1472 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1473 | } |
1474 | ||
7b724b86 | 1475 | void |
f64091a7 | 1476 | dnsInit(void) |
7b724b86 | 1477 | { |
1478 | static int init = 0; | |
62e76326 | 1479 | |
d24ef4e9 | 1480 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1481 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1482 | |
4d6c8504 | 1483 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1484 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1485 | |
cc192b50 | 1486 | if (!Config.Addrs.udp_outgoing.IsNoAddr()) |
049441d9 | 1487 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1488 | else |
049441d9 | 1489 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1490 | |
049441d9 HN |
1491 | Ip::Address addrV4 = addrV6; |
1492 | addrV4.SetIPv4(); | |
7e07ced1 | 1493 | |
049441d9 HN |
1494 | if (Ip::EnableIpv6 && addrV6.IsIPv6()) { |
1495 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); | |
4d6c8504 | 1496 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1497 | IPPROTO_UDP, |
049441d9 | 1498 | addrV6, |
04f7fd38 | 1499 | COMM_NONBLOCKING, |
055421ee | 1500 | "DNS Socket IPv6"); |
7e07ced1 | 1501 | } |
4d6c8504 | 1502 | |
049441d9 HN |
1503 | if (addrV4.IsIPv4()) { |
1504 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); | |
4d6c8504 | 1505 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1506 | IPPROTO_UDP, |
049441d9 | 1507 | addrV4, |
04f7fd38 | 1508 | COMM_NONBLOCKING, |
055421ee | 1509 | "DNS Socket IPv4"); |
7e07ced1 | 1510 | } |
62e76326 | 1511 | |
4d6c8504 | 1512 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1513 | fatal("Could not create a DNS socket"); |
1514 | ||
1515 | /* Ouch... we can't call functions using debug from a debug | |
1516 | * statement. Doing so messes up the internal Debug::level | |
1517 | */ | |
04f7fd38 | 1518 | if (DnsSocketB >= 0) { |
e91e2a72 | 1519 | comm_local_port(DnsSocketB); |
e0236918 | 1520 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1521 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1522 | } |
04f7fd38 | 1523 | if (DnsSocketA >= 0) { |
e91e2a72 | 1524 | comm_local_port(DnsSocketA); |
e0236918 | 1525 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1526 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1527 | } |
7b724b86 | 1528 | } |
62e76326 | 1529 | |
efd900cb | 1530 | assert(0 == nns); |
1531 | idnsParseNameservers(); | |
1191b93b | 1532 | #if !_SQUID_MSWIN_ |
62e76326 | 1533 | |
efd900cb | 1534 | if (0 == nns) |
62e76326 | 1535 | idnsParseResolvConf(); |
1536 | ||
0e6d05ef | 1537 | #endif |
be266cb2 | 1538 | #if _SQUID_WINDOWS_ |
0e6d05ef | 1539 | if (0 == nns) |
62e76326 | 1540 | idnsParseWIN32Registry(); |
0e6d05ef | 1541 | #endif |
62e76326 | 1542 | |
29fe9bd5 | 1543 | if (0 == nns) { |
e0236918 | 1544 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1545 | #if _SQUID_WINDOWS_ |
e0236918 | 1546 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1547 | #else |
e0236918 | 1548 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1549 | #endif |
29fe9bd5 | 1550 | |
e0236918 | 1551 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
29fe9bd5 | 1552 | idnsAddNameserver("127.0.0.1"); |
1553 | } | |
62e76326 | 1554 | |
7b724b86 | 1555 | if (!init) { |
62e76326 | 1556 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1557 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1558 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1559 | ++init; |
7b724b86 | 1560 | } |
372fb44e | 1561 | |
e210930b AJ |
1562 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1563 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1564 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1565 | max_shared_edns = -1; // disable if we might receive random replies. | |
1566 | } | |
1567 | #endif | |
1568 | ||
372fb44e | 1569 | idnsRegisterWithCacheManager(); |
7b724b86 | 1570 | } |
1571 | ||
1572 | void | |
f64091a7 | 1573 | dnsShutdown(void) |
7b724b86 | 1574 | { |
4d6c8504 | 1575 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1576 | return; |
1577 | ||
04f7fd38 | 1578 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1579 | comm_close(DnsSocketA); |
1580 | DnsSocketA = -1; | |
1581 | } | |
62e76326 | 1582 | |
055421ee | 1583 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1584 | comm_close(DnsSocketB); |
1585 | DnsSocketB = -1; | |
1586 | } | |
62e76326 | 1587 | |
95dc7ff4 | 1588 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1589 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1590 | if (Comm::IsConnOpen(vc->conn)) |
1591 | vc->conn->close(); | |
b26754c4 | 1592 | } |
1593 | } | |
1594 | ||
dd3fb890 | 1595 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1596 | idnsFreeNameservers(); |
68836b58 | 1597 | idnsFreeSearchpath(); |
7b724b86 | 1598 | } |
1599 | ||
3074b9d1 | 1600 | static int |
1601 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1602 | { | |
1603 | idns_query *q; | |
1604 | ||
1605 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1606 | ||
1607 | if (!old) | |
1608 | return 0; | |
1609 | ||
63a0e6b7 | 1610 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1611 | // idns_query is POD so no constructors are called after allocation |
1612 | q->xact_id.change(); | |
049441d9 | 1613 | // no query_id on this instance. |
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 | |
33ab4aaf | 1627 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1628 | { |
33ab4aaf HN |
1629 | q->start_t = current_time; |
1630 | q->callback = callback; | |
1631 | q->callback_data = cbdataReference(data); | |
1632 | ||
049441d9 | 1633 | q->hash.key = q->orig; |
3074b9d1 | 1634 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1635 | |
1636 | idnsSendQuery(q); | |
3074b9d1 | 1637 | } |
1638 | ||
049441d9 HN |
1639 | static void |
1640 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1641 | { | |
1642 | idns_query *q = cbdataAlloc(idns_query); | |
1643 | memcpy(q->name, master->name, sizeof(q->name)); | |
1644 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1645 | q->master = master; | |
1646 | q->query_id = idnsQueryID(); | |
1647 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1648 | q->start_t = master->start_t; |
049441d9 | 1649 | q->slave = master->slave; |
c7ba545e | 1650 | |
cafb131e | 1651 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1652 | ", id = 0x" << std::hex << q->query_id); |
1653 | if (!q->sz) { | |
1654 | cbdataFree(q); | |
1655 | return; | |
1656 | } | |
1657 | master->slave = q; | |
1658 | idnsSendQuery(q); | |
1659 | } | |
1660 | ||
7b724b86 | 1661 | void |
1662 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1663 | { | |
68836b58 | 1664 | unsigned int i; |
1665 | int nd = 0; | |
3074b9d1 | 1666 | idns_query *q; |
1667 | ||
1668 | if (idnsCachedLookup(name, callback, data)) | |
1669 | return; | |
1670 | ||
63a0e6b7 | 1671 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1672 | // idns_query is POD so no constructors are called after allocation |
1673 | q->xact_id.change(); | |
049441d9 | 1674 | q->query_id = idnsQueryID(); |
71952967 | 1675 | |
95dc7ff4 | 1676 | for (i = 0; i < strlen(name); ++i) |
68836b58 | 1677 | if (name[i] == '.') |
95dc7ff4 | 1678 | ++nd; |
68836b58 | 1679 | |
1680 | if (Config.onoff.res_defnames && npc > 0 && name[strlen(name)-1] != '.') { | |
1681 | q->do_searchpath = 1; | |
1682 | } else { | |
1683 | q->do_searchpath = 0; | |
1684 | } | |
1685 | ||
1686 | strcpy(q->orig, name); | |
1687 | strcpy(q->name, q->orig); | |
1688 | ||
1689 | if (q->do_searchpath && nd < ndots) { | |
1690 | q->domain = 0; | |
1691 | strcat(q->name, "."); | |
1692 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1693 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1694 | } |
1695 | ||
049441d9 HN |
1696 | // see EDNS notes at top of file why this sends 0 |
1697 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1698 | |
2041330b | 1699 | if (q->sz < 0) { |
1700 | /* problem with query data -- query not sent */ | |
1701 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1702 | cbdataFree(q); |
2041330b | 1703 | return; |
1704 | } | |
1705 | ||
26ac0430 | 1706 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1707 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1708 | |
33ab4aaf | 1709 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1710 | |
1711 | if (Ip::EnableIpv6) | |
1712 | idnsSendSlaveAAAAQuery(q); | |
1713 | ||
7b724b86 | 1714 | } |
8db71107 | 1715 | |
1716 | void | |
b7ac5457 | 1717 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1718 | { |
3074b9d1 | 1719 | idns_query *q; |
1720 | ||
cc192b50 | 1721 | char ip[MAX_IPSTRLEN]; |
1722 | ||
1723 | addr.NtoA(ip,MAX_IPSTRLEN); | |
3074b9d1 | 1724 | |
63a0e6b7 | 1725 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1726 | |
91dcbd43 CT |
1727 | // idns_query is POD so no constructors are called after allocation |
1728 | q->xact_id.change(); | |
049441d9 | 1729 | q->query_id = idnsQueryID(); |
71952967 | 1730 | |
4e6de170 | 1731 | if (addr.IsIPv6()) { |
cc192b50 | 1732 | struct in6_addr addr6; |
1733 | addr.GetInAddr(addr6); | |
546ae352 | 1734 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1735 | } else { |
cc192b50 | 1736 | struct in_addr addr4; |
1737 | addr.GetInAddr(addr4); | |
e210930b | 1738 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1739 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1740 | } |
1741 | ||
26ac0430 | 1742 | if (q->sz < 0) { |
2041330b | 1743 | /* problem with query data -- query not sent */ |
1744 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1745 | cbdataFree(q); |
2041330b | 1746 | return; |
1747 | } | |
1748 | ||
37f3da43 | 1749 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1750 | cbdataFree(q); |
1751 | return; | |
37f3da43 | 1752 | } |
1753 | ||
26ac0430 | 1754 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1755 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1756 | |
33ab4aaf | 1757 | idnsStartQuery(q, callback, data); |
8db71107 | 1758 | } |
eb824054 | 1759 | |
59ad6d31 | 1760 | #if SQUID_SNMP |
3c573763 | 1761 | /* |
1762 | * The function to return the DNS via SNMP | |
1763 | */ | |
1764 | variable_list * | |
f64091a7 | 1765 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1766 | { |
1767 | int i, n = 0; | |
1768 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1769 | MemBuf tmp; |
1770 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1771 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1772 | |
3c573763 | 1773 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1774 | |
3c573763 | 1775 | case DNS_REQ: |
62e76326 | 1776 | |
95dc7ff4 | 1777 | for (i = 0; i < nns; ++i) |
62e76326 | 1778 | n += nameservers[i].nqueries; |
1779 | ||
1780 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1781 | n, | |
1782 | SMI_COUNTER32); | |
1783 | ||
1784 | break; | |
1785 | ||
3c573763 | 1786 | case DNS_REP: |
95dc7ff4 | 1787 | for (i = 0; i < nns; ++i) |
62e76326 | 1788 | n += nameservers[i].nreplies; |
1789 | ||
1790 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1791 | n, | |
1792 | SMI_COUNTER32); | |
1793 | ||
1794 | break; | |
1795 | ||
3c573763 | 1796 | case DNS_SERVERS: |
62e76326 | 1797 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1798 | nns, |
62e76326 | 1799 | SMI_COUNTER32); |
1800 | ||
1801 | break; | |
1802 | ||
3c573763 | 1803 | default: |
62e76326 | 1804 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1805 | ||
1806 | break; | |
3c573763 | 1807 | } |
62e76326 | 1808 | |
3c573763 | 1809 | return Answer; |
1810 | } | |
62e76326 | 1811 | |
3c573763 | 1812 | #endif /*SQUID_SNMP */ |
f64091a7 | 1813 | #endif /* USE_DNSHELPER */ |