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7b724b86 | 1 | /* |
7b724b86 | 2 | * DEBUG: section 78 DNS lookups; interacts with lib/rfc1035.c |
3 | * AUTHOR: Duane Wessels | |
4 | * | |
2b6662ba | 5 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
7b724b86 | 6 | * ---------------------------------------------------------- |
7 | * | |
2b6662ba | 8 | * Squid is the result of efforts by numerous individuals from |
9 | * the Internet community; see the CONTRIBUTORS file for full | |
10 | * details. Many organizations have provided support for Squid's | |
11 | * development; see the SPONSORS file for full details. Squid is | |
12 | * Copyrighted (C) 2001 by the Regents of the University of | |
13 | * California; see the COPYRIGHT file for full details. Squid | |
14 | * incorporates software developed and/or copyrighted by other | |
15 | * sources; see the CREDITS file for full details. | |
7b724b86 | 16 | * |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
26ac0430 | 21 | * |
7b724b86 | 22 | * This program is distributed in the hope that it will be useful, |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26ac0430 | 26 | * |
7b724b86 | 27 | * You should have received a copy of the GNU General Public License |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
30 | * | |
31 | */ | |
32 | ||
582c2af2 FC |
33 | #include "squid.h" |
34 | #include "base/InstanceId.h" | |
602d9612 | 35 | #include "comm.h" |
55cbb02b | 36 | #include "comm/Connection.h" |
aed188fd | 37 | #include "comm/ConnOpener.h" |
d841c88d | 38 | #include "comm/Loops.h" |
7e66d5e2 | 39 | #include "comm/Read.h" |
d841c88d | 40 | #include "comm/Write.h" |
17852883 | 41 | #include "dlink.h" |
cfd66529 | 42 | #include "event.h" |
c4ad1349 | 43 | #include "fd.h" |
2c471ba8 | 44 | #include "fde.h" |
055421ee | 45 | #include "ip/tools.h" |
8a89c28f | 46 | #include "Mem.h" |
0eb49b6d | 47 | #include "MemBuf.h" |
8822ebee | 48 | #include "mgr/Registration.h" |
582c2af2 | 49 | #include "rfc3596.h" |
4d5904f7 | 50 | #include "SquidConfig.h" |
582c2af2 FC |
51 | #include "SquidTime.h" |
52 | #include "Store.h" | |
8d03bdb4 | 53 | #include "tools.h" |
7176768b | 54 | #include "util.h" |
d295d770 | 55 | #include "wordlist.h" |
68836b58 | 56 | |
9c0a2256 FC |
57 | #if SQUID_SNMP |
58 | #include "snmp_core.h" | |
59 | #endif | |
60 | ||
68836b58 | 61 | #if HAVE_ARPA_NAMESER_H |
62 | #include <arpa/nameser.h> | |
63 | #endif | |
1a30fdf5 | 64 | #include <cerrno> |
68836b58 | 65 | #if HAVE_RESOLV_H |
66 | #include <resolv.h> | |
67 | #endif | |
68 | ||
be266cb2 | 69 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
70 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
71 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
72 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 73 | #endif |
68836b58 | 74 | #ifndef _PATH_RESCONF |
75 | #define _PATH_RESCONF "/etc/resolv.conf" | |
76 | #endif | |
77 | #ifndef NS_DEFAULTPORT | |
78 | #define NS_DEFAULTPORT 53 | |
79 | #endif | |
80 | ||
81 | #ifndef NS_MAXDNAME | |
82 | #define NS_MAXDNAME 1025 | |
83 | #endif | |
84 | ||
85 | #ifndef MAXDNSRCH | |
86 | #define MAXDNSRCH 6 | |
7b724b86 | 87 | #endif |
68836b58 | 88 | |
89 | /* The buffer size required to store the maximum allowed search path */ | |
90 | #ifndef RESOLV_BUFSZ | |
91 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 92 | #endif |
93 | ||
42b51993 | 94 | #define IDNS_MAX_TRIES 20 |
e210930b | 95 | #define MAX_RCODE 17 |
558be27a | 96 | #define MAX_ATTEMPT 3 |
97 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
98 | // NP: see http://www.iana.org/assignments/dns-parameters |
99 | static const char *Rcodes[] = { | |
24520b1b AJ |
100 | /* RFC 1035 */ |
101 | "Success", | |
102 | "Packet Format Error", | |
103 | "DNS Server Failure", | |
104 | "Non-Existent Domain", | |
105 | "Not Implemented", | |
106 | "Query Refused", | |
107 | /* RFC 2136 */ | |
108 | "Name Exists when it should not", | |
109 | "RR Set Exists when it should not", | |
110 | "RR Set that should exist does not", | |
111 | "Server Not Authoritative for zone", | |
112 | "Name not contained in zone", | |
113 | /* unassigned */ | |
114 | "","","","","", | |
115 | /* RFC 2671 */ | |
116 | "Bad OPT Version or TSIG Signature Failure" | |
117 | }; | |
558be27a | 118 | |
58a39dc9 | 119 | typedef struct _idns_query idns_query; |
62e76326 | 120 | |
7b724b86 | 121 | typedef struct _ns ns; |
58a39dc9 | 122 | |
68836b58 | 123 | typedef struct _sp sp; |
124 | ||
d24ef4e9 | 125 | typedef struct _nsvc nsvc; |
126 | ||
26ac0430 | 127 | struct _idns_query { |
3074b9d1 | 128 | hash_link hash; |
9e1f210d | 129 | rfc1035_query query; |
68836b58 | 130 | char buf[RESOLV_BUFSZ]; |
131 | char name[NS_MAXDNAME + 1]; | |
132 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 133 | ssize_t sz; |
049441d9 | 134 | unsigned short query_id; /// random query ID sent to server; changes with every query sent |
13b08e1c | 135 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried |
91dcbd43 | 136 | |
58a39dc9 | 137 | int nsends; |
d24ef4e9 | 138 | int need_vc; |
a079e38b | 139 | bool permit_mdns; |
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 | |
a079e38b | 178 | bool mDNSResolver; |
d24ef4e9 | 179 | nsvc *vc; |
7b724b86 | 180 | }; |
58a39dc9 | 181 | |
26ac0430 | 182 | struct _sp { |
68836b58 | 183 | char domain[NS_MAXDNAME]; |
184 | int queries; | |
185 | }; | |
186 | ||
d24ef4e9 | 187 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 188 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 189 | |
7b724b86 | 190 | static ns *nameservers = NULL; |
68836b58 | 191 | static sp *searchpath = NULL; |
7b724b86 | 192 | static int nns = 0; |
193 | static int nns_alloc = 0; | |
51aee437 | 194 | static int nns_mdns_count = 0; |
68836b58 | 195 | static int npc = 0; |
196 | static int npc_alloc = 0; | |
197 | static int ndots = 1; | |
7b724b86 | 198 | static dlink_list lru_list; |
7cfc1c9a | 199 | static int event_queued = 0; |
3074b9d1 | 200 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 201 | |
e210930b AJ |
202 | /* |
203 | * Notes on EDNS: | |
204 | * | |
205 | * IPv4: | |
206 | * EDNS as specified may be sent as an additional record for any request. | |
207 | * early testing has revealed that it works on common devices, but cannot | |
208 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
209 | * | |
210 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
211 | * | |
212 | * Squid design: | |
213 | * Squid is optimized to generate one packet and re-send it to all NS | |
214 | * due to this we cannot customize the EDNS size per NS. | |
215 | * | |
216 | * As such we take the configuration option value as fixed. | |
217 | * | |
218 | * FUTURE TODO: | |
219 | * This may not be worth doing, but if/when additional-records are parsed | |
220 | * we will be able to recover the OPT value specific to any one NS and | |
221 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
222 | * size our active NS are capable. | |
223 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
224 | * Responses from the configured NS may cause this to be raised or turned off. | |
225 | */ | |
226 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
227 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
228 | #endif | |
229 | ||
7b724b86 | 230 | static OBJH idnsStats; |
231 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 232 | static void idnsAddMDNSNameservers(); |
68836b58 | 233 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 234 | static void idnsFreeNameservers(void); |
68836b58 | 235 | static void idnsFreeSearchpath(void); |
a079e38b AJ |
236 | static bool idnsParseNameservers(void); |
237 | #if _SQUID_WINDOWS_ | |
238 | static bool idnsParseResolvConf(void); | |
1f1ae50a | 239 | #endif |
be266cb2 | 240 | #if _SQUID_WINDOWS_ |
a079e38b | 241 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 242 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 243 | #endif |
33ab4aaf | 244 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 245 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 246 | static IOCB idnsReadVCHeader; |
e0d28505 | 247 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 248 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
249 | static IOCB idnsReadVC; |
250 | static IOCB idnsSentQueryVC; | |
62e76326 | 251 | |
b7ac5457 | 252 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 253 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 254 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 255 | static PF idnsRead; |
7cfc1c9a | 256 | static EVH idnsCheckQueue; |
efd900cb | 257 | static void idnsTickleQueue(void); |
558be27a | 258 | static void idnsRcodeCount(int, int); |
575d05c4 | 259 | static CLCB idnsVCClosed; |
91dcbd43 | 260 | static unsigned short idnsQueryID(void); |
049441d9 | 261 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 262 | |
a079e38b AJ |
263 | static void |
264 | idnsCheckMDNS(idns_query *q) | |
265 | { | |
bce61b00 AJ |
266 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
267 | return; | |
268 | ||
a079e38b AJ |
269 | size_t slen = strlen(q->name); |
270 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
271 | q->permit_mdns = true; | |
272 | } | |
273 | } | |
274 | ||
275 | static void | |
276 | idnsAddMDNSNameservers() | |
277 | { | |
51aee437 | 278 | nns_mdns_count=0; |
a079e38b | 279 | |
bce61b00 AJ |
280 | // mDNS is disabled |
281 | if (!Config.onoff.dns_mdns) | |
282 | return; | |
283 | ||
a079e38b | 284 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
285 | if (Ip::EnableIpv6) { |
286 | idnsAddNameserver("FF02::FB"); | |
287 | nameservers[nns-1].S.port(5353); | |
288 | nameservers[nns-1].mDNSResolver = true; | |
289 | ++nns_mdns_count; | |
290 | } | |
a079e38b AJ |
291 | |
292 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 293 | nameservers[nns-1].S.port(5353); |
a079e38b | 294 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
295 | |
296 | ++nns_mdns_count; | |
a079e38b AJ |
297 | } |
298 | ||
7b724b86 | 299 | static void |
300 | idnsAddNameserver(const char *buf) | |
301 | { | |
b7ac5457 | 302 | Ip::Address A; |
62e76326 | 303 | |
cc192b50 | 304 | if (!(A = buf)) { |
fa84c01d | 305 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 306 | return; |
d20b1cd0 | 307 | } |
62e76326 | 308 | |
4dd643d5 | 309 | if (A.isAnyAddr()) { |
fa84c01d | 310 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 311 | A.setLocalhost(); |
fa84c01d | 312 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 313 | } |
62e76326 | 314 | |
4dd643d5 | 315 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
316 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
317 | return; | |
5c5a349d | 318 | } |
62e76326 | 319 | |
7b724b86 | 320 | if (nns == nns_alloc) { |
62e76326 | 321 | int oldalloc = nns_alloc; |
322 | ns *oldptr = nameservers; | |
323 | ||
324 | if (nns_alloc == 0) | |
325 | nns_alloc = 2; | |
326 | else | |
327 | nns_alloc <<= 1; | |
328 | ||
329 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
330 | ||
331 | if (oldptr && oldalloc) | |
41d00cd3 | 332 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 333 | |
334 | if (oldptr) | |
335 | safe_free(oldptr); | |
7b724b86 | 336 | } |
62e76326 | 337 | |
7b724b86 | 338 | assert(nns < nns_alloc); |
4dd643d5 | 339 | A.port(NS_DEFAULTPORT); |
cc192b50 | 340 | nameservers[nns].S = A; |
e210930b AJ |
341 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
342 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
343 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
344 | #endif | |
cc192b50 | 345 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 346 | ++nns; |
7b724b86 | 347 | } |
348 | ||
68836b58 | 349 | static void |
350 | idnsAddPathComponent(const char *buf) | |
351 | { | |
352 | if (npc == npc_alloc) { | |
353 | int oldalloc = npc_alloc; | |
354 | sp *oldptr = searchpath; | |
355 | ||
356 | if (0 == npc_alloc) | |
357 | npc_alloc = 2; | |
358 | else | |
359 | npc_alloc <<= 1; | |
360 | ||
361 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
362 | ||
363 | if (oldptr && oldalloc) | |
41d00cd3 | 364 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 365 | |
366 | if (oldptr) | |
367 | safe_free(oldptr); | |
368 | } | |
369 | ||
370 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
371 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
372 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 373 | Tolower(searchpath[npc].domain); |
bf8fe701 | 374 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 375 | ++npc; |
68836b58 | 376 | } |
377 | ||
7b724b86 | 378 | static void |
379 | idnsFreeNameservers(void) | |
380 | { | |
381 | safe_free(nameservers); | |
382 | nns = nns_alloc = 0; | |
383 | } | |
384 | ||
68836b58 | 385 | static void |
386 | idnsFreeSearchpath(void) | |
387 | { | |
388 | safe_free(searchpath); | |
389 | npc = npc_alloc = 0; | |
390 | } | |
391 | ||
a079e38b | 392 | static bool |
efd900cb | 393 | idnsParseNameservers(void) |
394 | { | |
a079e38b AJ |
395 | bool result = false; |
396 | for (wordlist *w = Config.dns_nameservers; w; w = w->next) { | |
e0236918 | 397 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 398 | idnsAddNameserver(w->key); |
a079e38b | 399 | result = true; |
efd900cb | 400 | } |
a079e38b | 401 | return result; |
efd900cb | 402 | } |
403 | ||
7aa9bb3e | 404 | #if !_SQUID_WINDOWS_ |
a079e38b | 405 | static bool |
7b724b86 | 406 | idnsParseResolvConf(void) |
407 | { | |
408 | FILE *fp; | |
68836b58 | 409 | char buf[RESOLV_BUFSZ]; |
a083e75a | 410 | const char *t; |
a079e38b | 411 | bool result = false; |
68836b58 | 412 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 413 | |
7b724b86 | 414 | if (fp == NULL) { |
e0236918 | 415 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
a079e38b | 416 | return false; |
7b724b86 | 417 | } |
62e76326 | 418 | |
be266cb2 | 419 | #if _SQUID_CYGWIN_ |
c4aefe96 | 420 | setmode(fileno(fp), O_TEXT); |
421 | #endif | |
62e76326 | 422 | |
68836b58 | 423 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 424 | t = strtok(buf, w_space); |
425 | ||
68836b58 | 426 | if (NULL == t) { |
62e76326 | 427 | continue; |
a37d6070 | 428 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 429 | t = strtok(NULL, w_space); |
62e76326 | 430 | |
68836b58 | 431 | if (NULL == t) |
432 | continue; | |
62e76326 | 433 | |
e0236918 | 434 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 435 | |
68836b58 | 436 | idnsAddNameserver(t); |
a079e38b | 437 | result = true; |
a37d6070 | 438 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
439 | idnsFreeSearchpath(); |
440 | t = strtok(NULL, w_space); | |
a083e75a | 441 | |
26ac0430 AJ |
442 | if (NULL == t) |
443 | continue; | |
a083e75a | 444 | |
e0236918 | 445 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 446 | |
26ac0430 | 447 | idnsAddPathComponent(t); |
a37d6070 | 448 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 449 | idnsFreeSearchpath(); |
68836b58 | 450 | while (NULL != t) { |
451 | t = strtok(NULL, w_space); | |
452 | ||
453 | if (NULL == t) | |
454 | continue; | |
455 | ||
e0236918 | 456 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 457 | |
458 | idnsAddPathComponent(t); | |
459 | } | |
a37d6070 | 460 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 461 | while (NULL != t) { |
462 | t = strtok(NULL, w_space); | |
62e76326 | 463 | |
68836b58 | 464 | if (NULL == t) |
465 | continue; | |
62e76326 | 466 | |
2c2da7d3 | 467 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 468 | ndots = atoi(t + 6); |
469 | ||
470 | if (ndots < 1) | |
471 | ndots = 1; | |
472 | ||
e0236918 | 473 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 474 | } |
475 | } | |
476 | } | |
7b724b86 | 477 | } |
a083e75a | 478 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
479 | t = strchr(t, '.'); |
480 | if (t) | |
481 | idnsAddPathComponent(t+1); | |
a083e75a | 482 | } |
62e76326 | 483 | |
7b724b86 | 484 | fclose(fp); |
a079e38b | 485 | return result; |
7b724b86 | 486 | } |
487 | ||
1f1ae50a | 488 | #endif |
489 | ||
be266cb2 | 490 | #if _SQUID_WINDOWS_ |
6b610e34 | 491 | static void |
d02b72b4 | 492 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 493 | { |
a16cb11f | 494 | char *t; |
6b610e34 | 495 | char *token; |
496 | HKEY hndKey; | |
497 | ||
0dde2160 | 498 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 499 | DWORD Type = 0; |
500 | DWORD Size = 0; | |
501 | LONG Result; | |
04f7fd38 | 502 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
503 | |
504 | if (Result == ERROR_SUCCESS && Size) { | |
505 | t = (char *) xmalloc(Size); | |
0dde2160 | 506 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 507 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
508 | idnsAddPathComponent(t); |
509 | xfree(t); | |
510 | } | |
04f7fd38 | 511 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 512 | |
513 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 514 | t = (char *) xmalloc(Size); |
04f7fd38 | 515 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 516 | token = strtok(t, Separator); |
6b610e34 | 517 | |
518 | while (token) { | |
519 | idnsAddPathComponent(token); | |
e0236918 | 520 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 521 | token = strtok(NULL, Separator); |
522 | } | |
26ac0430 | 523 | xfree(t); |
6b610e34 | 524 | } |
525 | ||
526 | RegCloseKey(hndKey); | |
527 | } | |
a6cae565 | 528 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
529 | t = strchr(t, '.'); |
530 | if (t) | |
531 | idnsAddPathComponent(t + 1); | |
a16cb11f | 532 | } |
6b610e34 | 533 | } |
534 | ||
a079e38b | 535 | static bool |
0e6d05ef | 536 | idnsParseWIN32Registry(void) |
537 | { | |
a16cb11f | 538 | char *t; |
0e6d05ef | 539 | char *token; |
540 | HKEY hndKey, hndKey2; | |
a079e38b | 541 | bool result = false; |
0e6d05ef | 542 | |
0e6d05ef | 543 | switch (WIN32_OS_version) { |
62e76326 | 544 | |
0e6d05ef | 545 | case _WIN_OS_WINNT: |
62e76326 | 546 | /* get nameservers from the Windows NT registry */ |
547 | ||
04f7fd38 | 548 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 549 | DWORD Type = 0; |
550 | DWORD Size = 0; | |
551 | LONG Result; | |
04f7fd38 | 552 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 553 | |
554 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 555 | t = (char *) xmalloc(Size); |
0dde2160 | 556 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 557 | token = strtok(t, ", "); |
62e76326 | 558 | |
559 | while (token) { | |
560 | idnsAddNameserver(token); | |
a079e38b | 561 | result = true; |
e0236918 | 562 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 563 | token = strtok(NULL, ","); |
62e76326 | 564 | } |
26ac0430 | 565 | xfree(t); |
62e76326 | 566 | } |
567 | ||
0dde2160 | 568 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 569 | |
570 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 571 | t = (char *) xmalloc(Size); |
a6cae565 | 572 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 573 | token = strtok(t, ", "); |
62e76326 | 574 | |
575 | while (token) { | |
e0236918 | 576 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 577 | idnsAddNameserver(token); |
a079e38b | 578 | result = true; |
62e76326 | 579 | token = strtok(NULL, ", "); |
580 | } | |
26ac0430 | 581 | xfree(t); |
62e76326 | 582 | } |
583 | ||
584 | RegCloseKey(hndKey); | |
585 | } | |
586 | ||
6b610e34 | 587 | idnsParseWIN32SearchList(" "); |
588 | ||
62e76326 | 589 | break; |
590 | ||
0e6d05ef | 591 | case _WIN_OS_WIN2K: |
62e76326 | 592 | |
b671cc68 | 593 | case _WIN_OS_WINXP: |
62e76326 | 594 | |
6b1846cf | 595 | case _WIN_OS_WINNET: |
28170269 | 596 | |
597 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
598 | |
599 | case _WIN_OS_WIN7: | |
62e76326 | 600 | /* get nameservers from the Windows 2000 registry */ |
601 | /* search all interfaces for DNS server addresses */ | |
602 | ||
04f7fd38 | 603 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 604 | int i; |
04f7fd38 AJ |
605 | DWORD MaxSubkeyLen, InterfacesCount; |
606 | char *keyname; | |
607 | FILETIME ftLastWriteTime; | |
608 | ||
609 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
610 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 611 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
612 | DWORD j; |
613 | j = MaxSubkeyLen; | |
614 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
615 | char *newkeyname; | |
616 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
617 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
618 | strcat(newkeyname, "\\"); | |
619 | strcat(newkeyname, keyname); | |
620 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
621 | DWORD Type = 0; | |
622 | DWORD Size = 0; | |
623 | LONG Result; | |
624 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
625 | if (Result == ERROR_SUCCESS && Size) { | |
626 | t = (char *) xmalloc(Size); | |
627 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
628 | token = strtok(t, ", "); | |
629 | while (token) { | |
e0236918 | 630 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 631 | idnsAddNameserver(token); |
a079e38b | 632 | result = true; |
04f7fd38 AJ |
633 | token = strtok(NULL, ", "); |
634 | } | |
635 | xfree(t); | |
636 | } | |
637 | ||
638 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
639 | if (Result == ERROR_SUCCESS && Size) { | |
640 | t = (char *) xmalloc(Size); | |
641 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
642 | token = strtok(t, ", "); | |
643 | while (token) { | |
e0236918 | 644 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 645 | idnsAddNameserver(token); |
a079e38b | 646 | result = true; |
04f7fd38 AJ |
647 | token = strtok(NULL, ", "); |
648 | } | |
649 | ||
650 | xfree(t); | |
62e76326 | 651 | } |
62e76326 | 652 | |
0dde2160 | 653 | RegCloseKey(hndKey2); |
62e76326 | 654 | } |
655 | ||
04f7fd38 | 656 | xfree(newkeyname); |
62e76326 | 657 | } |
658 | } | |
0dde2160 | 659 | |
04f7fd38 | 660 | xfree(keyname); |
62e76326 | 661 | } |
662 | ||
663 | RegCloseKey(hndKey); | |
664 | } | |
665 | ||
6b610e34 | 666 | idnsParseWIN32SearchList(", "); |
667 | ||
62e76326 | 668 | break; |
669 | ||
0e6d05ef | 670 | case _WIN_OS_WIN95: |
62e76326 | 671 | |
0e6d05ef | 672 | case _WIN_OS_WIN98: |
62e76326 | 673 | |
be20dac7 | 674 | case _WIN_OS_WINME: |
62e76326 | 675 | /* get nameservers from the Windows 9X registry */ |
676 | ||
04f7fd38 | 677 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 678 | DWORD Type = 0; |
679 | DWORD Size = 0; | |
680 | LONG Result; | |
04f7fd38 | 681 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 682 | |
683 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 684 | t = (char *) xmalloc(Size); |
a6cae565 | 685 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 686 | token = strtok(t, ", "); |
62e76326 | 687 | |
688 | while (token) { | |
e0236918 | 689 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 690 | idnsAddNameserver(token); |
a079e38b | 691 | result = true; |
62e76326 | 692 | token = strtok(NULL, ", "); |
693 | } | |
26ac0430 | 694 | xfree(t); |
62e76326 | 695 | } |
696 | ||
697 | RegCloseKey(hndKey); | |
698 | } | |
699 | ||
700 | break; | |
701 | ||
0e6d05ef | 702 | default: |
e0236918 | 703 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 704 | } |
a079e38b AJ |
705 | |
706 | return result; | |
0e6d05ef | 707 | } |
62e76326 | 708 | |
0e6d05ef | 709 | #endif |
710 | ||
7b724b86 | 711 | static void |
712 | idnsStats(StoreEntry * sentry) | |
713 | { | |
a16b4aa0 | 714 | dlink_node *n; |
715 | idns_query *q; | |
7cfc1c9a | 716 | int i; |
558be27a | 717 | int j; |
cc192b50 | 718 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 719 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 720 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 721 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
722 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
723 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 724 | |
a16b4aa0 | 725 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 726 | q = (idns_query *)n->data; |
bce61b00 | 727 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 728 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 729 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
730 | tvSubDsec(q->sent_t, current_time), |
731 | (q->permit_mdns? 'M':' '), | |
732 | q->name); | |
7cfc1c9a | 733 | } |
62e76326 | 734 | |
e210930b | 735 | if (Config.dns.packet_max > 0) |
bce61b00 | 736 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 737 | else |
bce61b00 | 738 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 739 | |
7cfc1c9a | 740 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
741 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
742 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 743 | |
95dc7ff4 | 744 | for (i = 0; i < nns; ++i) { |
a079e38b | 745 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 746 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 747 | nameservers[i].nqueries, |
a079e38b AJ |
748 | nameservers[i].nreplies, |
749 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 750 | } |
62e76326 | 751 | |
558be27a | 752 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
753 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 754 | |
95dc7ff4 | 755 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 756 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
757 | ||
e210930b | 758 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 759 | |
95dc7ff4 | 760 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
761 | if (j > 10 && j < 16) |
762 | continue; // unassigned by IANA. | |
763 | ||
62e76326 | 764 | storeAppendPrintf(sentry, "%5d", j); |
765 | ||
95dc7ff4 | 766 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 767 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
768 | ||
e210930b | 769 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 770 | } |
6b610e34 | 771 | |
772 | if (npc) { | |
773 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
774 | ||
95dc7ff4 | 775 | for (i=0; i < npc; ++i) |
6b610e34 | 776 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
777 | ||
778 | storeAppendPrintf(sentry, "\n"); | |
779 | } | |
7b724b86 | 780 | } |
781 | ||
efd900cb | 782 | static void |
783 | idnsTickleQueue(void) | |
784 | { | |
785 | if (event_queued) | |
62e76326 | 786 | return; |
787 | ||
efd900cb | 788 | if (NULL == lru_list.tail) |
62e76326 | 789 | return; |
790 | ||
fd0f51c4 CT |
791 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
792 | ||
793 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 794 | |
efd900cb | 795 | event_queued = 1; |
796 | } | |
797 | ||
d24ef4e9 | 798 | static void |
c8407295 | 799 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *buf, size_t size, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 800 | { |
801 | nsvc * vc = (nsvc *)data; | |
802 | ||
c8407295 | 803 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 804 | return; |
af6a12ee | 805 | |
e0d28505 AJ |
806 | // XXX: irrelevant now that we have conn pointer? |
807 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 808 | return; |
d24ef4e9 | 809 | |
c8407295 | 810 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 811 | conn->close(); |
d24ef4e9 | 812 | return; |
813 | } | |
814 | ||
815 | vc->busy = 0; | |
816 | idnsDoSendQueryVC(vc); | |
817 | } | |
818 | ||
819 | static void | |
820 | idnsDoSendQueryVC(nsvc *vc) | |
821 | { | |
822 | if (vc->busy) | |
823 | return; | |
824 | ||
032785bf | 825 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 826 | return; |
827 | ||
8401d6fc AR |
828 | // if retrying after a TC UDP response, our close handler cb may be pending |
829 | if (fd_table[vc->conn->fd].closing()) | |
830 | return; | |
831 | ||
032785bf | 832 | MemBuf *mb = vc->queue; |
d24ef4e9 | 833 | |
032785bf | 834 | vc->queue = new MemBuf; |
d24ef4e9 | 835 | |
836 | vc->busy = 1; | |
837 | ||
fd0f51c4 | 838 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
839 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
840 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 841 | AsyncCall::Pointer nil; |
d4b21972 | 842 | |
1b76e6c1 | 843 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 844 | |
ec41b64c AJ |
845 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
846 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 847 | Comm::Write(vc->conn, mb, call); |
032785bf | 848 | |
849 | delete mb; | |
d24ef4e9 | 850 | } |
851 | ||
852 | static void | |
c8407295 | 853 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int xerrno, void *data) |
d24ef4e9 | 854 | { |
855 | nsvc * vc = (nsvc *)data; | |
856 | ||
c8407295 | 857 | if (status != Comm::OK || !conn) { |
dd3fb890 AR |
858 | char buf[MAX_IPSTRLEN] = ""; |
859 | if (vc->ns < nns) | |
4dd643d5 | 860 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 861 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 862 | return; |
863 | } | |
864 | ||
00406b24 | 865 | vc->conn = conn; |
cfd66529 AJ |
866 | |
867 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
868 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
869 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
870 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 871 | vc->busy = 0; |
872 | idnsDoSendQueryVC(vc); | |
873 | } | |
874 | ||
875 | static void | |
575d05c4 | 876 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 877 | { |
575d05c4 | 878 | nsvc * vc = (nsvc *)params.data; |
032785bf | 879 | delete vc->queue; |
880 | delete vc->msg; | |
00406b24 | 881 | vc->conn = NULL; |
f64091a7 | 882 | if (vc->ns < nns) // XXX: dnsShutdown may have freed nameservers[] |
dd3fb890 | 883 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 884 | cbdataFree(vc); |
d24ef4e9 | 885 | } |
886 | ||
887 | static void | |
9dca980d | 888 | idnsInitVC(int nsv) |
d24ef4e9 | 889 | { |
890 | nsvc *vc = cbdataAlloc(nsvc); | |
9dca980d | 891 | assert(nsv < nns); |
00406b24 | 892 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d AJ |
893 | nameservers[nsv].vc = vc; |
894 | vc->ns = nsv; | |
032785bf | 895 | vc->queue = new MemBuf; |
032785bf | 896 | vc->msg = new MemBuf; |
cfd66529 | 897 | vc->busy = 1; |
d24ef4e9 | 898 | |
00406b24 | 899 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 900 | |
4dd643d5 | 901 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 902 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 903 | else |
7fb5be3e | 904 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 905 | |
7fb5be3e | 906 | if (conn->remote.isIPv4()) |
4dd643d5 | 907 | conn->local.setIPv4(); |
f5ba22ff | 908 | |
cfd66529 | 909 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 910 | |
4accd6d8 | 911 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 912 | cs->setHost("DNS TCP Socket"); |
855150a4 | 913 | AsyncJob::Start(cs); |
d24ef4e9 | 914 | } |
915 | ||
916 | static void | |
9dca980d | 917 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 918 | { |
9dca980d AJ |
919 | assert(nsn < nns); |
920 | if (nameservers[nsn].vc == NULL) | |
921 | idnsInitVC(nsn); | |
d24ef4e9 | 922 | |
9dca980d | 923 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 924 | |
445962f3 HN |
925 | if (!vc) { |
926 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 927 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
928 | |
929 | return; | |
930 | } | |
931 | ||
2fe7eff9 | 932 | vc->queue->reset(); |
d24ef4e9 | 933 | |
934 | short head = htons(q->sz); | |
935 | ||
2fe7eff9 | 936 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 937 | |
2fe7eff9 | 938 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 939 | |
940 | idnsDoSendQueryVC(vc); | |
941 | } | |
942 | ||
7b724b86 | 943 | static void |
944 | idnsSendQuery(idns_query * q) | |
945 | { | |
4d6c8504 | 946 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 947 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 948 | return; |
0a69973e | 949 | } |
62e76326 | 950 | |
cc192b50 | 951 | if (nns <= 0) { |
e0236918 | 952 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 953 | return; |
954 | } | |
62e76326 | 955 | |
7b724b86 | 956 | assert(q->lru.next == NULL); |
62e76326 | 957 | |
7b724b86 | 958 | assert(q->lru.prev == NULL); |
62e76326 | 959 | |
4d6c8504 | 960 | int x = -1, y = -1; |
9dca980d | 961 | int nsn; |
4d6c8504 | 962 | |
213b6c90 | 963 | do { |
a079e38b AJ |
964 | // only use mDNS resolvers for mDNS compatible queries |
965 | if (!q->permit_mdns) | |
51aee437 | 966 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
967 | else |
968 | nsn = q->nsends % nns; | |
213b6c90 AJ |
969 | |
970 | if (q->need_vc) { | |
9dca980d | 971 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 972 | x = y = 0; |
213b6c90 | 973 | } else { |
4dd643d5 | 974 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 975 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 976 | else if (DnsSocketA >= 0) |
9dca980d | 977 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 978 | } |
62e76326 | 979 | |
95dc7ff4 | 980 | ++ q->nsends; |
62e76326 | 981 | |
33ab4aaf | 982 | q->sent_t = current_time; |
62e76326 | 983 | |
4dd643d5 | 984 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
e0236918 | 985 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4dd643d5 | 986 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
e0236918 | 987 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
988 | |
989 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 990 | |
bd6a0c8f | 991 | if (y > 0) { |
4d6c8504 | 992 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 993 | } |
bd6a0c8f | 994 | if (x > 0) { |
4d6c8504 | 995 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 996 | } |
62e76326 | 997 | |
9dca980d | 998 | ++ nameservers[nsn].nqueries; |
c131f066 | 999 | q->queue_t = current_time; |
7b724b86 | 1000 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 1001 | q->pending = 1; |
efd900cb | 1002 | idnsTickleQueue(); |
7b724b86 | 1003 | } |
1004 | ||
1005 | static int | |
b7ac5457 | 1006 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 1007 | { |
1008 | int i; | |
62e76326 | 1009 | |
95dc7ff4 | 1010 | for (i = 0; i < nns; ++i) { |
cc192b50 | 1011 | if (nameservers[i].S != from) |
62e76326 | 1012 | continue; |
1013 | ||
4dd643d5 | 1014 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 1015 | continue; |
1016 | ||
1017 | return i; | |
7b724b86 | 1018 | } |
62e76326 | 1019 | |
7cfc1c9a | 1020 | return -1; |
7b724b86 | 1021 | } |
1022 | ||
1023 | static idns_query * | |
1024 | idnsFindQuery(unsigned short id) | |
1025 | { | |
1026 | dlink_node *n; | |
1027 | idns_query *q; | |
62e76326 | 1028 | |
7b724b86 | 1029 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1030 | q = (idns_query*)n->data; |
1031 | ||
049441d9 | 1032 | if (q->query_id == id) |
62e76326 | 1033 | return q; |
7b724b86 | 1034 | } |
62e76326 | 1035 | |
7b724b86 | 1036 | return NULL; |
1037 | } | |
1038 | ||
108d67a0 | 1039 | static unsigned short |
1040 | idnsQueryID(void) | |
1041 | { | |
1042 | unsigned short id = squid_random() & 0xFFFF; | |
1043 | unsigned short first_id = id; | |
1044 | ||
26ac0430 | 1045 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1046 | ++id; |
108d67a0 | 1047 | |
846c8960 | 1048 | if (id == first_id) { |
e0236918 | 1049 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1050 | break; |
846c8960 | 1051 | } |
108d67a0 | 1052 | } |
1053 | ||
846c8960 | 1054 | return id; |
108d67a0 | 1055 | } |
1056 | ||
3074b9d1 | 1057 | static void |
33ab4aaf | 1058 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1059 | { |
1060 | IDNSCB *callback; | |
1061 | void *cbdata; | |
1062 | ||
33ab4aaf HN |
1063 | if (error) |
1064 | q->error = error; | |
1065 | ||
1066 | if (q->master) | |
1067 | q = q->master; | |
1068 | ||
33ab4aaf | 1069 | // If any of our subqueries are still pending then wait for them to complete before continuing |
9dca980d | 1070 | for (idns_query *q2 = q; q2; q2 = q2->slave) { |
33ab4aaf HN |
1071 | if (q2->pending) { |
1072 | return; | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | /* Merge results */ | |
1077 | rfc1035_message *message = q->message; | |
1078 | q->message = NULL; | |
1079 | int n = q->ancount; | |
1080 | error = q->error; | |
1081 | ||
9dca980d | 1082 | while ( idns_query *q2 = q->slave ) { |
33ab4aaf HN |
1083 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); |
1084 | q->slave = q2->slave; | |
1085 | if ( !q2->error ) { | |
1086 | if (n > 0) { | |
1087 | // two sets of RR need merging | |
1088 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1089 | if (Config.dns.v4_first) { | |
1090 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1091 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1092 | } else { | |
1093 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1094 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1095 | } | |
1096 | n += q2->ancount; | |
1097 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1098 | // result, do not free them here | |
1099 | safe_free(message->answer); | |
1100 | safe_free(q2->message->answer); | |
1101 | message->answer = result; | |
1102 | message->ancount += q2->message->ancount; | |
1103 | } else { | |
1104 | // first response empty or failed, just use the second | |
1105 | rfc1035MessageDestroy(&message); | |
1106 | message = q2->message; | |
1107 | q2->message = NULL; | |
1108 | n = q2->ancount; | |
1109 | error = NULL; | |
1110 | } | |
1111 | } | |
1112 | rfc1035MessageDestroy(&q2->message); | |
1113 | cbdataFree(q2); | |
1114 | } | |
1115 | ||
1116 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1117 | ||
3074b9d1 | 1118 | callback = q->callback; |
1119 | q->callback = NULL; | |
33ab4aaf | 1120 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1121 | |
1122 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1123 | callback(cbdata, answers, n, error); | |
1124 | ||
26ac0430 | 1125 | while (q->queue) { |
3074b9d1 | 1126 | idns_query *q2 = q->queue; |
1127 | q->queue = q2->queue; | |
1128 | callback = q2->callback; | |
1129 | q2->callback = NULL; | |
1130 | ||
1131 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1132 | callback(cbdata, answers, n, error); | |
1133 | ||
63a0e6b7 | 1134 | cbdataFree(q2); |
3074b9d1 | 1135 | } |
1136 | ||
1137 | if (q->hash.key) { | |
1138 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1139 | q->hash.key = NULL; | |
1140 | } | |
33ab4aaf HN |
1141 | |
1142 | rfc1035MessageDestroy(&message); | |
1143 | cbdataFree(q); | |
3074b9d1 | 1144 | } |
1145 | ||
7b724b86 | 1146 | static void |
e210930b | 1147 | idnsGrokReply(const char *buf, size_t sz, int from_ns) |
7b724b86 | 1148 | { |
1149 | int n; | |
ec7bade0 | 1150 | rfc1035_message *message = NULL; |
7b724b86 | 1151 | idns_query *q; |
3074b9d1 | 1152 | |
cc192b50 | 1153 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1154 | |
ec7bade0 | 1155 | if (message == NULL) { |
e0236918 | 1156 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1157 | return; |
7b724b86 | 1158 | } |
62e76326 | 1159 | |
91dcbd43 | 1160 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1161 | |
1162 | q = idnsFindQuery(message->id); | |
1163 | ||
7b724b86 | 1164 | if (q == NULL) { |
bf8fe701 | 1165 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1166 | rfc1035MessageDestroy(&message); |
62e76326 | 1167 | return; |
7b724b86 | 1168 | } |
62e76326 | 1169 | |
9e1f210d | 1170 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1171 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1172 | rfc1035MessageDestroy(&message); |
9e1f210d | 1173 | return; |
1174 | } | |
1175 | ||
e210930b AJ |
1176 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1177 | // TODO: actually gr the message right here. | |
1178 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q | |
1179 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1180 | // AND allows us to merge AN+AR sections from both responses (one day) | |
1181 | ||
1182 | if (q->edns_seen >= 0) { | |
1183 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1184 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1185 | // the altered NS was limiting the whole group. | |
1186 | max_shared_edns = q->edns_seen; | |
1187 | // may be limited by one of the others still | |
95dc7ff4 | 1188 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1189 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1190 | } else { | |
1191 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1192 | // maybe reduce the global limit downwards to accomodate this NS | |
1193 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1194 | } | |
1195 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1196 | max_shared_edns = -1; | |
1197 | } | |
1198 | #endif | |
1199 | ||
049441d9 HN |
1200 | dlinkDelete(&q->lru, &lru_list); |
1201 | q->pending = 0; | |
1202 | ||
d24ef4e9 | 1203 | if (message->tc) { |
bae9832d | 1204 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1205 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1206 | |
1207 | if (!q->need_vc) { | |
1208 | q->need_vc = 1; | |
5e263176 | 1209 | -- q->nsends; |
d24ef4e9 | 1210 | idnsSendQuery(q); |
91dcbd43 CT |
1211 | } else { |
1212 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1213 | // Return an error and cleanup; no point in trying TCP again. | |
1214 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1215 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1216 | } |
1217 | ||
1218 | return; | |
1219 | } | |
9e1f210d | 1220 | |
558be27a | 1221 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1222 | |
558be27a | 1223 | if (n < 0) { |
7ba8d0b8 | 1224 | q->rcode = -n; |
42687bb2 | 1225 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1226 | |
95dc7ff4 | 1227 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1228 | /* |
1229 | * RCODE 2 is "Server failure - The name server was | |
1230 | * unable to process this query due to a problem with | |
1231 | * the name server." | |
1232 | */ | |
cc192b50 | 1233 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1234 | rfc1035MessageDestroy(&message); | |
62e76326 | 1235 | idnsSendQuery(q); |
1236 | return; | |
1237 | } | |
68836b58 | 1238 | |
0e6432d0 HN |
1239 | // Do searchpath processing on the master A query only to keep |
1240 | // things simple. NXDOMAIN is authorative for the label, not | |
1241 | // the record type. | |
049441d9 | 1242 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1243 | assert(NULL == message->answer); |
1244 | strcpy(q->name, q->orig); | |
1245 | ||
cc192b50 | 1246 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1247 | ||
68836b58 | 1248 | if (q->domain < npc) { |
1249 | strcat(q->name, "."); | |
1250 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1251 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1252 | ++ q->domain; |
68836b58 | 1253 | } else { |
95dc7ff4 | 1254 | ++ q->attempt; |
68836b58 | 1255 | } |
1256 | ||
049441d9 | 1257 | rfc1035MessageDestroy(&message); |
cc192b50 | 1258 | |
33ab4aaf | 1259 | // cleanup slave AAAA query |
049441d9 HN |
1260 | while (idns_query *slave = q->slave) { |
1261 | dlinkDelete(&slave->lru, &lru_list); | |
1262 | q->slave = slave->slave; | |
1263 | rfc1035MessageDestroy(&slave->message); | |
1264 | cbdataFree(slave); | |
cc192b50 | 1265 | } |
c7ba545e | 1266 | |
049441d9 HN |
1267 | // Build new query |
1268 | q->query_id = idnsQueryID(); | |
1269 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1270 | // see EDNS notes at top of file why this sends 0 | |
1271 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1272 | if (q->sz < 0) { |
1273 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1274 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1275 | return; |
1276 | } | |
1277 | ||
33ab4aaf HN |
1278 | q->nsends = 0; |
1279 | ||
a079e38b | 1280 | idnsCheckMDNS(q); |
68836b58 | 1281 | idnsSendQuery(q); |
049441d9 HN |
1282 | if (Ip::EnableIpv6) |
1283 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1284 | return; |
1285 | } | |
558be27a | 1286 | } |
62e76326 | 1287 | |
049441d9 HN |
1288 | q->message = message; |
1289 | q->ancount = n; | |
cc192b50 | 1290 | |
33ab4aaf HN |
1291 | if (n >= 0) |
1292 | idnsCallback(q, NULL); | |
1293 | else | |
1294 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1295 | |
7b724b86 | 1296 | } |
1297 | ||
1298 | static void | |
1299 | idnsRead(int fd, void *data) | |
1300 | { | |
d193a436 | 1301 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1302 | int len; |
42b51993 | 1303 | int max = INCOMING_DNS_MAX; |
d29b40de | 1304 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1305 | Ip::Address from; |
cc192b50 | 1306 | |
d7e7eaa7 | 1307 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1308 | |
bd6a0c8f HN |
1309 | // Always keep reading. This stops (or at least makes harder) several |
1310 | // attacks on the DNS client. | |
d841c88d | 1311 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1312 | |
cc192b50 | 1313 | /* BUG (UNRESOLVED) |
1314 | * two code lines after returning from comm_udprecvfrom() | |
1315 | * something overwrites the memory behind the from parameter. | |
1316 | * NO matter where in the stack declaration list above it is placed | |
1317 | * The cause of this is still unknown, however copying the data appears | |
1318 | * to allow it to be passed further without this erasure. | |
1319 | */ | |
b7ac5457 | 1320 | Ip::Address bugbypass; |
62e76326 | 1321 | |
5e263176 FC |
1322 | while (max) { |
1323 | --max; | |
cc192b50 | 1324 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1325 | |
cc192b50 | 1326 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1327 | |
1328 | if (len == 0) | |
1329 | break; | |
1330 | ||
1331 | if (len < 0) { | |
1332 | if (ignoreErrno(errno)) | |
1333 | break; | |
1334 | ||
1191b93b | 1335 | #if _SQUID_LINUX_ |
62e76326 | 1336 | /* Some Linux systems seem to set the FD for reading and then |
1337 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1338 | * port unreachable message. */ | |
1339 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1340 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1341 | #endif |
62e76326 | 1342 | |
e0236918 | 1343 | debugs(50, DBG_IMPORTANT, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1344 | |
1345 | break; | |
1346 | } | |
1347 | ||
055421ee | 1348 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1349 | |
62e76326 | 1350 | assert(N); |
aec55359 | 1351 | ++(*N); |
cc192b50 | 1352 | |
1353 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1354 | ||
1355 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1356 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1357 | |
9dca980d AJ |
1358 | if (nsn >= 0) { |
1359 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1360 | } |
1361 | ||
1362 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1363 | // but after the ++ above to keep statistics right. | |
1364 | if (!lru_list.head) | |
1365 | continue; // Don't process replies if there is no pending query. | |
1366 | ||
9dca980d | 1367 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1368 | static time_t last_warning = 0; |
1369 | ||
1370 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1371 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1372 | last_warning = squid_curtime; |
26ac0430 | 1373 | } else { |
e0236918 | 1374 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1375 | } |
1376 | continue; | |
62e76326 | 1377 | } |
1378 | ||
9dca980d | 1379 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1380 | } |
1381 | } | |
1382 | ||
7cfc1c9a | 1383 | static void |
1384 | idnsCheckQueue(void *unused) | |
1385 | { | |
1386 | dlink_node *n; | |
0c4fe9e4 | 1387 | dlink_node *p = NULL; |
7cfc1c9a | 1388 | idns_query *q; |
1389 | event_queued = 0; | |
62e76326 | 1390 | |
820ee9fa AJ |
1391 | if (0 == nns) |
1392 | /* name servers went away; reconfiguring or shutting down */ | |
1393 | return; | |
1394 | ||
0c4fe9e4 | 1395 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1396 | |
820ee9fa | 1397 | p = n->prev; |
733cedc0 | 1398 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1399 | |
820ee9fa | 1400 | /* Anything to process in the queue? */ |
fd0f51c4 | 1401 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1402 | break; |
62e76326 | 1403 | |
33ab4aaf | 1404 | /* Query timer still running? */ |
fd0f51c4 | 1405 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1406 | dlinkDelete(&q->lru, &lru_list); |
1407 | q->queue_t = current_time; | |
1408 | dlinkAdd(q, &q->lru, &lru_list); | |
1409 | continue; | |
1410 | } | |
62e76326 | 1411 | |
91dcbd43 CT |
1412 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1413 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1414 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1415 | |
1416 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1417 | q->pending = 0; |
62e76326 | 1418 | |
fd0f51c4 | 1419 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1420 | idnsSendQuery(q); |
1421 | } else { | |
91dcbd43 | 1422 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1423 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1424 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1425 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1426 | |
1427 | if (q->rcode != 0) | |
33ab4aaf | 1428 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1429 | else |
33ab4aaf | 1430 | idnsCallback(q, "Timeout"); |
62e76326 | 1431 | } |
7cfc1c9a | 1432 | } |
62e76326 | 1433 | |
efd900cb | 1434 | idnsTickleQueue(); |
7cfc1c9a | 1435 | } |
1436 | ||
d24ef4e9 | 1437 | static void |
c8407295 | 1438 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 1439 | { |
1440 | nsvc * vc = (nsvc *)data; | |
1441 | ||
c8407295 | 1442 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1443 | return; |
1444 | ||
c8407295 | 1445 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1446 | if (Comm::IsConnOpen(conn)) |
1447 | conn->close(); | |
d24ef4e9 | 1448 | return; |
1449 | } | |
1450 | ||
bd6a0c8f | 1451 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1452 | |
032785bf | 1453 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1454 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1455 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1456 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1457 | return; |
1458 | } | |
1459 | ||
dd3fb890 | 1460 | assert(vc->ns < nns); |
e0d28505 | 1461 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1462 | |
e210930b | 1463 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1464 | vc->msg->clean(); |
abd8f140 AJ |
1465 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1466 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1467 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1468 | } |
1469 | ||
1470 | static void | |
c8407295 | 1471 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 1472 | { |
1473 | nsvc * vc = (nsvc *)data; | |
1474 | ||
c8407295 | 1475 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1476 | return; |
1477 | ||
c8407295 | 1478 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1479 | if (Comm::IsConnOpen(conn)) |
1480 | conn->close(); | |
d24ef4e9 | 1481 | return; |
1482 | } | |
1483 | ||
1484 | vc->read_msglen += len; | |
1485 | ||
1486 | assert(vc->read_msglen <= 2); | |
1487 | ||
1488 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1489 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1490 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1491 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1492 | return; |
1493 | } | |
1494 | ||
1495 | vc->read_msglen = 0; | |
1496 | ||
1497 | vc->msglen = ntohs(vc->msglen); | |
1498 | ||
8185c30b SS |
1499 | if (!vc->msglen) { |
1500 | if (Comm::IsConnOpen(conn)) | |
1501 | conn->close(); | |
1502 | return; | |
1503 | } | |
1504 | ||
2fe7eff9 | 1505 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1506 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1507 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1508 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1509 | } |
1510 | ||
558be27a | 1511 | /* |
1512 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1513 | */ | |
1514 | static void | |
1515 | idnsRcodeCount(int rcode, int attempt) | |
1516 | { | |
1517 | if (rcode > 0) | |
62e76326 | 1518 | rcode = 0; |
558be27a | 1519 | else if (rcode < 0) |
62e76326 | 1520 | rcode = -rcode; |
1521 | ||
558be27a | 1522 | if (rcode < MAX_RCODE) |
62e76326 | 1523 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1524 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1525 | } |
1526 | ||
7b724b86 | 1527 | /* ====================================================================== */ |
1528 | ||
5f5e883f FC |
1529 | static void |
1530 | idnsRegisterWithCacheManager(void) | |
1531 | { | |
8822ebee | 1532 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1533 | } |
1534 | ||
7b724b86 | 1535 | void |
f64091a7 | 1536 | dnsInit(void) |
7b724b86 | 1537 | { |
1538 | static int init = 0; | |
62e76326 | 1539 | |
d24ef4e9 | 1540 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1541 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1542 | |
4d6c8504 | 1543 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1544 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1545 | |
4dd643d5 | 1546 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1547 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1548 | else |
049441d9 | 1549 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1550 | |
049441d9 | 1551 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1552 | addrV4.setIPv4(); |
7e07ced1 | 1553 | |
4dd643d5 | 1554 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1555 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1556 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1557 | IPPROTO_UDP, |
049441d9 | 1558 | addrV6, |
04f7fd38 | 1559 | COMM_NONBLOCKING, |
055421ee | 1560 | "DNS Socket IPv6"); |
7e07ced1 | 1561 | } |
4d6c8504 | 1562 | |
4dd643d5 | 1563 | if (addrV4.isIPv4()) { |
049441d9 | 1564 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1565 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1566 | IPPROTO_UDP, |
049441d9 | 1567 | addrV4, |
04f7fd38 | 1568 | COMM_NONBLOCKING, |
055421ee | 1569 | "DNS Socket IPv4"); |
7e07ced1 | 1570 | } |
62e76326 | 1571 | |
4d6c8504 | 1572 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1573 | fatal("Could not create a DNS socket"); |
1574 | ||
1575 | /* Ouch... we can't call functions using debug from a debug | |
1576 | * statement. Doing so messes up the internal Debug::level | |
1577 | */ | |
04f7fd38 | 1578 | if (DnsSocketB >= 0) { |
e91e2a72 | 1579 | comm_local_port(DnsSocketB); |
e0236918 | 1580 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1581 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1582 | } |
04f7fd38 | 1583 | if (DnsSocketA >= 0) { |
e91e2a72 | 1584 | comm_local_port(DnsSocketA); |
e0236918 | 1585 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1586 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1587 | } |
7b724b86 | 1588 | } |
62e76326 | 1589 | |
efd900cb | 1590 | assert(0 == nns); |
a079e38b AJ |
1591 | idnsAddMDNSNameservers(); |
1592 | bool nsFound = idnsParseNameservers(); | |
7aa9bb3e | 1593 | #if !_SQUID_WINDOWS_ |
62e76326 | 1594 | |
a079e38b AJ |
1595 | if (!nsFound) |
1596 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1597 | |
0e6d05ef | 1598 | #endif |
be266cb2 | 1599 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1600 | if (!nsFound) |
1601 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1602 | #endif |
62e76326 | 1603 | |
a079e38b | 1604 | if (!nsFound) { |
e0236918 | 1605 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1606 | #if _SQUID_WINDOWS_ |
e0236918 | 1607 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1608 | #else |
e0236918 | 1609 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1610 | #endif |
29fe9bd5 | 1611 | |
e0236918 | 1612 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1613 | if (Ip::EnableIpv6) |
1614 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1615 | idnsAddNameserver("127.0.0.1"); |
1616 | } | |
62e76326 | 1617 | |
7b724b86 | 1618 | if (!init) { |
62e76326 | 1619 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1620 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1621 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1622 | ++init; |
7b724b86 | 1623 | } |
372fb44e | 1624 | |
e210930b AJ |
1625 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1626 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1627 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1628 | max_shared_edns = -1; // disable if we might receive random replies. | |
1629 | } | |
1630 | #endif | |
1631 | ||
372fb44e | 1632 | idnsRegisterWithCacheManager(); |
7b724b86 | 1633 | } |
1634 | ||
1635 | void | |
f64091a7 | 1636 | dnsShutdown(void) |
7b724b86 | 1637 | { |
4d6c8504 | 1638 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1639 | return; |
1640 | ||
04f7fd38 | 1641 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1642 | comm_close(DnsSocketA); |
1643 | DnsSocketA = -1; | |
1644 | } | |
62e76326 | 1645 | |
055421ee | 1646 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1647 | comm_close(DnsSocketB); |
1648 | DnsSocketB = -1; | |
1649 | } | |
62e76326 | 1650 | |
95dc7ff4 | 1651 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1652 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1653 | if (Comm::IsConnOpen(vc->conn)) |
1654 | vc->conn->close(); | |
b26754c4 | 1655 | } |
1656 | } | |
1657 | ||
dd3fb890 | 1658 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1659 | idnsFreeNameservers(); |
68836b58 | 1660 | idnsFreeSearchpath(); |
7b724b86 | 1661 | } |
1662 | ||
3074b9d1 | 1663 | static int |
1664 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1665 | { | |
1666 | idns_query *q; | |
1667 | ||
1668 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1669 | ||
1670 | if (!old) | |
1671 | return 0; | |
1672 | ||
63a0e6b7 | 1673 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1674 | // idns_query is POD so no constructors are called after allocation |
1675 | q->xact_id.change(); | |
049441d9 | 1676 | // no query_id on this instance. |
3074b9d1 | 1677 | |
1678 | q->callback = callback; | |
1679 | ||
1680 | q->callback_data = cbdataReference(data); | |
1681 | ||
1682 | q->queue = old->queue; | |
1683 | ||
1684 | old->queue = q; | |
1685 | ||
1686 | return 1; | |
1687 | } | |
1688 | ||
1689 | static void | |
33ab4aaf | 1690 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1691 | { |
33ab4aaf HN |
1692 | q->start_t = current_time; |
1693 | q->callback = callback; | |
1694 | q->callback_data = cbdataReference(data); | |
1695 | ||
049441d9 | 1696 | q->hash.key = q->orig; |
3074b9d1 | 1697 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1698 | |
1699 | idnsSendQuery(q); | |
3074b9d1 | 1700 | } |
1701 | ||
049441d9 HN |
1702 | static void |
1703 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1704 | { | |
1705 | idns_query *q = cbdataAlloc(idns_query); | |
1706 | memcpy(q->name, master->name, sizeof(q->name)); | |
1707 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1708 | q->master = master; | |
1709 | q->query_id = idnsQueryID(); | |
1710 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1711 | q->start_t = master->start_t; |
049441d9 | 1712 | q->slave = master->slave; |
c7ba545e | 1713 | |
cafb131e | 1714 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1715 | ", id = 0x" << std::hex << q->query_id); |
1716 | if (!q->sz) { | |
1717 | cbdataFree(q); | |
1718 | return; | |
1719 | } | |
a079e38b | 1720 | idnsCheckMDNS(q); |
049441d9 HN |
1721 | master->slave = q; |
1722 | idnsSendQuery(q); | |
1723 | } | |
1724 | ||
7b724b86 | 1725 | void |
1726 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1727 | { | |
32f89713 NH |
1728 | size_t nameLength = strlen(name); |
1729 | ||
1730 | // Prevent buffer overflow on q->name | |
1731 | if (nameLength > NS_MAXDNAME) { | |
1732 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
1733 | callback(data, NULL, 0, "Internal error"); | |
1734 | return; | |
1735 | } | |
3074b9d1 | 1736 | |
1737 | if (idnsCachedLookup(name, callback, data)) | |
1738 | return; | |
1739 | ||
32f89713 | 1740 | idns_query *q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1741 | // idns_query is POD so no constructors are called after allocation |
1742 | q->xact_id.change(); | |
049441d9 | 1743 | q->query_id = idnsQueryID(); |
71952967 | 1744 | |
32f89713 NH |
1745 | int nd = 0; |
1746 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1747 | if (name[i] == '.') |
95dc7ff4 | 1748 | ++nd; |
68836b58 | 1749 | |
32f89713 | 1750 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1751 | q->do_searchpath = 1; |
1752 | } else { | |
1753 | q->do_searchpath = 0; | |
1754 | } | |
1755 | ||
1756 | strcpy(q->orig, name); | |
1757 | strcpy(q->name, q->orig); | |
1758 | ||
1759 | if (q->do_searchpath && nd < ndots) { | |
1760 | q->domain = 0; | |
1761 | strcat(q->name, "."); | |
1762 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1763 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1764 | } |
1765 | ||
049441d9 HN |
1766 | // see EDNS notes at top of file why this sends 0 |
1767 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1768 | |
2041330b | 1769 | if (q->sz < 0) { |
1770 | /* problem with query data -- query not sent */ | |
1771 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1772 | cbdataFree(q); |
2041330b | 1773 | return; |
1774 | } | |
1775 | ||
26ac0430 | 1776 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1777 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1778 | |
a079e38b | 1779 | idnsCheckMDNS(q); |
33ab4aaf | 1780 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1781 | |
1782 | if (Ip::EnableIpv6) | |
1783 | idnsSendSlaveAAAAQuery(q); | |
1784 | ||
7b724b86 | 1785 | } |
8db71107 | 1786 | |
1787 | void | |
b7ac5457 | 1788 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1789 | { |
3074b9d1 | 1790 | idns_query *q; |
1791 | ||
cc192b50 | 1792 | char ip[MAX_IPSTRLEN]; |
1793 | ||
4dd643d5 | 1794 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1795 | |
63a0e6b7 | 1796 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1797 | |
91dcbd43 CT |
1798 | // idns_query is POD so no constructors are called after allocation |
1799 | q->xact_id.change(); | |
049441d9 | 1800 | q->query_id = idnsQueryID(); |
71952967 | 1801 | |
4dd643d5 | 1802 | if (addr.isIPv6()) { |
cc192b50 | 1803 | struct in6_addr addr6; |
4dd643d5 | 1804 | addr.getInAddr(addr6); |
546ae352 | 1805 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1806 | } else { |
cc192b50 | 1807 | struct in_addr addr4; |
4dd643d5 | 1808 | addr.getInAddr(addr4); |
e210930b | 1809 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1810 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1811 | } |
1812 | ||
26ac0430 | 1813 | if (q->sz < 0) { |
2041330b | 1814 | /* problem with query data -- query not sent */ |
1815 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1816 | cbdataFree(q); |
2041330b | 1817 | return; |
1818 | } | |
1819 | ||
37f3da43 | 1820 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1821 | cbdataFree(q); |
1822 | return; | |
37f3da43 | 1823 | } |
1824 | ||
26ac0430 | 1825 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1826 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1827 | |
bce61b00 | 1828 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1829 | idnsStartQuery(q, callback, data); |
8db71107 | 1830 | } |
eb824054 | 1831 | |
59ad6d31 | 1832 | #if SQUID_SNMP |
3c573763 | 1833 | /* |
1834 | * The function to return the DNS via SNMP | |
1835 | */ | |
1836 | variable_list * | |
f64091a7 | 1837 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1838 | { |
1839 | int i, n = 0; | |
1840 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1841 | MemBuf tmp; |
1842 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1843 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1844 | |
3c573763 | 1845 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1846 | |
3c573763 | 1847 | case DNS_REQ: |
62e76326 | 1848 | |
95dc7ff4 | 1849 | for (i = 0; i < nns; ++i) |
62e76326 | 1850 | n += nameservers[i].nqueries; |
1851 | ||
1852 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1853 | n, | |
1854 | SMI_COUNTER32); | |
1855 | ||
1856 | break; | |
1857 | ||
3c573763 | 1858 | case DNS_REP: |
95dc7ff4 | 1859 | for (i = 0; i < nns; ++i) |
62e76326 | 1860 | n += nameservers[i].nreplies; |
1861 | ||
1862 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1863 | n, | |
1864 | SMI_COUNTER32); | |
1865 | ||
1866 | break; | |
1867 | ||
3c573763 | 1868 | case DNS_SERVERS: |
62e76326 | 1869 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1870 | nns, |
62e76326 | 1871 | SMI_COUNTER32); |
1872 | ||
1873 | break; | |
1874 | ||
3c573763 | 1875 | default: |
62e76326 | 1876 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1877 | ||
1878 | break; | |
3c573763 | 1879 | } |
62e76326 | 1880 | |
3c573763 | 1881 | return Answer; |
1882 | } | |
62e76326 | 1883 | |
3c573763 | 1884 | #endif /*SQUID_SNMP */ |