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7b724b86 | 1 | /* |
77b1029d | 2 | * Copyright (C) 1996-2020 The Squid Software Foundation and contributors |
7b724b86 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7b724b86 | 7 | */ |
8 | ||
4a3b98d7 | 9 | /* DEBUG: section 78 DNS lookups; interacts with dns/rfc1035.cc */ |
bbc27441 | 10 | |
582c2af2 | 11 | #include "squid.h" |
cd2a20f7 | 12 | #include "base/CodeContext.h" |
582c2af2 | 13 | #include "base/InstanceId.h" |
ee58de20 | 14 | #include "base/RunnersRegistry.h" |
602d9612 | 15 | #include "comm.h" |
55cbb02b | 16 | #include "comm/Connection.h" |
aed188fd | 17 | #include "comm/ConnOpener.h" |
d841c88d | 18 | #include "comm/Loops.h" |
7e66d5e2 | 19 | #include "comm/Read.h" |
d841c88d | 20 | #include "comm/Write.h" |
17852883 | 21 | #include "dlink.h" |
4a3b98d7 AJ |
22 | #include "dns/forward.h" |
23 | #include "dns/rfc3596.h" | |
cfd66529 | 24 | #include "event.h" |
c4ad1349 | 25 | #include "fd.h" |
2c471ba8 | 26 | #include "fde.h" |
055421ee | 27 | #include "ip/tools.h" |
0eb49b6d | 28 | #include "MemBuf.h" |
8822ebee | 29 | #include "mgr/Registration.h" |
4d5904f7 | 30 | #include "SquidConfig.h" |
582c2af2 FC |
31 | #include "SquidTime.h" |
32 | #include "Store.h" | |
8d03bdb4 | 33 | #include "tools.h" |
7176768b | 34 | #include "util.h" |
d295d770 | 35 | #include "wordlist.h" |
68836b58 | 36 | |
9c0a2256 FC |
37 | #if SQUID_SNMP |
38 | #include "snmp_core.h" | |
39 | #endif | |
40 | ||
68836b58 | 41 | #if HAVE_ARPA_NAMESER_H |
42 | #include <arpa/nameser.h> | |
43 | #endif | |
1a30fdf5 | 44 | #include <cerrno> |
011b1672 | 45 | #include <random> |
68836b58 | 46 | #if HAVE_RESOLV_H |
47 | #include <resolv.h> | |
48 | #endif | |
49 | ||
be266cb2 | 50 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
51 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
52 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
53 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 54 | #endif |
68836b58 | 55 | #ifndef _PATH_RESCONF |
56 | #define _PATH_RESCONF "/etc/resolv.conf" | |
57 | #endif | |
58 | #ifndef NS_DEFAULTPORT | |
59 | #define NS_DEFAULTPORT 53 | |
60 | #endif | |
61 | ||
62 | #ifndef NS_MAXDNAME | |
63 | #define NS_MAXDNAME 1025 | |
64 | #endif | |
65 | ||
66 | #ifndef MAXDNSRCH | |
67 | #define MAXDNSRCH 6 | |
7b724b86 | 68 | #endif |
68836b58 | 69 | |
70 | /* The buffer size required to store the maximum allowed search path */ | |
71 | #ifndef RESOLV_BUFSZ | |
72 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 73 | #endif |
74 | ||
42b51993 | 75 | #define IDNS_MAX_TRIES 20 |
e210930b | 76 | #define MAX_RCODE 17 |
558be27a | 77 | #define MAX_ATTEMPT 3 |
78 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
79 | // NP: see http://www.iana.org/assignments/dns-parameters |
80 | static const char *Rcodes[] = { | |
24520b1b AJ |
81 | /* RFC 1035 */ |
82 | "Success", | |
83 | "Packet Format Error", | |
84 | "DNS Server Failure", | |
85 | "Non-Existent Domain", | |
86 | "Not Implemented", | |
87 | "Query Refused", | |
88 | /* RFC 2136 */ | |
89 | "Name Exists when it should not", | |
90 | "RR Set Exists when it should not", | |
91 | "RR Set that should exist does not", | |
92 | "Server Not Authoritative for zone", | |
93 | "Name not contained in zone", | |
94 | /* unassigned */ | |
95 | "","","","","", | |
96 | /* RFC 2671 */ | |
97 | "Bad OPT Version or TSIG Signature Failure" | |
98 | }; | |
558be27a | 99 | |
68836b58 | 100 | typedef struct _sp sp; |
101 | ||
907a7a05 AJ |
102 | class idns_query |
103 | { | |
104 | CBDATA_CLASS(idns_query); | |
105 | ||
106 | public: | |
cd2a20f7 AR |
107 | idns_query(): |
108 | codeContext(CodeContext::Current()) | |
109 | { | |
1cb1b2d3 | 110 | callback = nullptr; |
907a7a05 AJ |
111 | memset(&query, 0, sizeof(query)); |
112 | *buf = 0; | |
113 | *name = 0; | |
114 | *orig = 0; | |
115 | memset(&start_t, 0, sizeof(start_t)); | |
116 | memset(&sent_t, 0, sizeof(sent_t)); | |
117 | memset(&queue_t, 0, sizeof(queue_t)); | |
118 | } | |
119 | ||
120 | ~idns_query() { | |
121 | if (message) | |
122 | rfc1035MessageDestroy(&message); | |
123 | delete queue; | |
124 | delete slave; | |
125 | // master is just a back-reference | |
126 | cbdataReferenceDone(callback_data); | |
127 | } | |
d24ef4e9 | 128 | |
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]; | |
1cb1b2d3 AJ |
134 | ssize_t sz = 0; |
135 | unsigned short query_id = 0; ///< random query ID sent to server; changes with every query sent | |
136 | InstanceId<idns_query> xact_id; ///< identifies our "transaction", stays constant when query is retried | |
91dcbd43 | 137 | |
1cb1b2d3 AJ |
138 | int nsends = 0; |
139 | int need_vc = 0; | |
140 | bool permit_mdns = false; | |
141 | int pending = 0; | |
62e76326 | 142 | |
58a39dc9 | 143 | struct timeval start_t; |
144 | struct timeval sent_t; | |
820ee9fa | 145 | struct timeval queue_t; |
58a39dc9 | 146 | dlink_node lru; |
cd2a20f7 | 147 | |
58a39dc9 | 148 | IDNSCB *callback; |
1cb1b2d3 | 149 | void *callback_data = nullptr; |
cd2a20f7 AR |
150 | CodeContext::Pointer codeContext; ///< requestor's context |
151 | ||
1cb1b2d3 AJ |
152 | int attempt = 0; |
153 | int rcode = 0; | |
154 | idns_query *queue = nullptr; | |
155 | idns_query *slave = nullptr; // single linked list | |
156 | idns_query *master = nullptr; // single pointer to a shared master | |
157 | unsigned short domain = 0; | |
158 | unsigned short do_searchpath = 0; | |
159 | rfc1035_message *message = nullptr; | |
160 | int ancount = 0; | |
161 | const char *error = nullptr; | |
58a39dc9 | 162 | }; |
907a7a05 | 163 | |
91dcbd43 | 164 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 165 | |
907a7a05 AJ |
166 | CBDATA_CLASS_INIT(idns_query); |
167 | ||
168 | class nsvc | |
169 | { | |
170 | CBDATA_CLASS(nsvc); | |
171 | ||
172 | public: | |
b56b37cf | 173 | explicit nsvc(size_t nsv) : ns(nsv), msg(new MemBuf()), queue(new MemBuf()) {} |
907a7a05 AJ |
174 | ~nsvc(); |
175 | ||
b56b37cf | 176 | size_t ns = 0; |
00406b24 | 177 | Comm::ConnectionPointer conn; |
1cb1b2d3 AJ |
178 | unsigned short msglen = 0; |
179 | int read_msglen = 0; | |
180 | MemBuf *msg = nullptr; | |
181 | MemBuf *queue = nullptr; | |
182 | bool busy = true; | |
d24ef4e9 | 183 | }; |
184 | ||
907a7a05 AJ |
185 | CBDATA_CLASS_INIT(nsvc); |
186 | ||
b56b37cf AJ |
187 | class ns |
188 | { | |
189 | public: | |
b7ac5457 | 190 | Ip::Address S; |
b56b37cf AJ |
191 | int nqueries = 0; |
192 | int nreplies = 0; | |
e210930b | 193 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
b56b37cf | 194 | int last_seen_edns = 0; |
e210930b | 195 | #endif |
b56b37cf AJ |
196 | bool mDNSResolver = false; |
197 | nsvc *vc = nullptr; | |
7b724b86 | 198 | }; |
58a39dc9 | 199 | |
ee58de20 AJ |
200 | namespace Dns |
201 | { | |
202 | ||
203 | /// manage DNS internal component | |
204 | class ConfigRr : public RegisteredRunner | |
205 | { | |
206 | public: | |
207 | /* RegisteredRunner API */ | |
208 | virtual void startReconfigure() override; | |
209 | virtual void endingShutdown() override; | |
210 | }; | |
211 | ||
212 | RunnerRegistrationEntry(ConfigRr); | |
213 | ||
214 | } // namespace Dns | |
215 | ||
26ac0430 | 216 | struct _sp { |
68836b58 | 217 | char domain[NS_MAXDNAME]; |
218 | int queries; | |
219 | }; | |
220 | ||
b56b37cf | 221 | static std::vector<ns> nameservers; |
68836b58 | 222 | static sp *searchpath = NULL; |
51aee437 | 223 | static int nns_mdns_count = 0; |
68836b58 | 224 | static int npc = 0; |
225 | static int npc_alloc = 0; | |
226 | static int ndots = 1; | |
7b724b86 | 227 | static dlink_list lru_list; |
7cfc1c9a | 228 | static int event_queued = 0; |
3074b9d1 | 229 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 230 | |
e210930b AJ |
231 | /* |
232 | * Notes on EDNS: | |
233 | * | |
234 | * IPv4: | |
235 | * EDNS as specified may be sent as an additional record for any request. | |
236 | * early testing has revealed that it works on common devices, but cannot | |
237 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
238 | * | |
239 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
240 | * | |
241 | * Squid design: | |
242 | * Squid is optimized to generate one packet and re-send it to all NS | |
243 | * due to this we cannot customize the EDNS size per NS. | |
244 | * | |
245 | * As such we take the configuration option value as fixed. | |
246 | * | |
247 | * FUTURE TODO: | |
248 | * This may not be worth doing, but if/when additional-records are parsed | |
249 | * we will be able to recover the OPT value specific to any one NS and | |
250 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
251 | * size our active NS are capable. | |
252 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
253 | * Responses from the configured NS may cause this to be raised or turned off. | |
254 | */ | |
255 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
256 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
257 | #endif | |
258 | ||
7b724b86 | 259 | static OBJH idnsStats; |
260 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 261 | static void idnsAddMDNSNameservers(); |
68836b58 | 262 | static void idnsAddPathComponent(const char *buf); |
68836b58 | 263 | static void idnsFreeSearchpath(void); |
a079e38b | 264 | static bool idnsParseNameservers(void); |
a079e38b | 265 | static bool idnsParseResolvConf(void); |
be266cb2 | 266 | #if _SQUID_WINDOWS_ |
a079e38b | 267 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 268 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 269 | #endif |
33ab4aaf | 270 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 271 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 272 | static IOCB idnsReadVCHeader; |
e0d28505 | 273 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 274 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
275 | static IOCB idnsReadVC; |
276 | static IOCB idnsSentQueryVC; | |
62e76326 | 277 | |
b7ac5457 | 278 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 279 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 280 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 281 | static PF idnsRead; |
7cfc1c9a | 282 | static EVH idnsCheckQueue; |
efd900cb | 283 | static void idnsTickleQueue(void); |
558be27a | 284 | static void idnsRcodeCount(int, int); |
575d05c4 | 285 | static CLCB idnsVCClosed; |
91dcbd43 | 286 | static unsigned short idnsQueryID(void); |
049441d9 | 287 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
fd9c47d1 | 288 | static void idnsCallbackOnEarlyError(IDNSCB *callback, void *cbdata, const char *error); |
7b724b86 | 289 | |
a079e38b AJ |
290 | static void |
291 | idnsCheckMDNS(idns_query *q) | |
292 | { | |
bce61b00 AJ |
293 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
294 | return; | |
295 | ||
a079e38b AJ |
296 | size_t slen = strlen(q->name); |
297 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
298 | q->permit_mdns = true; | |
299 | } | |
300 | } | |
301 | ||
302 | static void | |
303 | idnsAddMDNSNameservers() | |
304 | { | |
51aee437 | 305 | nns_mdns_count=0; |
a079e38b | 306 | |
bce61b00 AJ |
307 | // mDNS is disabled |
308 | if (!Config.onoff.dns_mdns) | |
309 | return; | |
310 | ||
a079e38b | 311 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
312 | if (Ip::EnableIpv6) { |
313 | idnsAddNameserver("FF02::FB"); | |
b56b37cf AJ |
314 | nameservers.back().S.port(5353); |
315 | nameservers.back().mDNSResolver = true; | |
51aee437 AJ |
316 | ++nns_mdns_count; |
317 | } | |
a079e38b AJ |
318 | |
319 | idnsAddNameserver("224.0.0.251"); | |
b56b37cf AJ |
320 | nameservers.back().S.port(5353); |
321 | nameservers.back().mDNSResolver = true; | |
51aee437 AJ |
322 | |
323 | ++nns_mdns_count; | |
a079e38b AJ |
324 | } |
325 | ||
7b724b86 | 326 | static void |
327 | idnsAddNameserver(const char *buf) | |
328 | { | |
b7ac5457 | 329 | Ip::Address A; |
62e76326 | 330 | |
cc192b50 | 331 | if (!(A = buf)) { |
fa84c01d | 332 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 333 | return; |
d20b1cd0 | 334 | } |
62e76326 | 335 | |
4dd643d5 | 336 | if (A.isAnyAddr()) { |
fa84c01d | 337 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 338 | A.setLocalhost(); |
fa84c01d | 339 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 340 | } |
62e76326 | 341 | |
4dd643d5 | 342 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
343 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
344 | return; | |
5c5a349d | 345 | } |
62e76326 | 346 | |
b56b37cf | 347 | nameservers.emplace_back(ns()); |
4dd643d5 | 348 | A.port(NS_DEFAULTPORT); |
b56b37cf | 349 | nameservers.back().S = A; |
e210930b | 350 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
b56b37cf | 351 | nameservers.back().last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; |
e210930b AJ |
352 | // TODO generate a test packet to probe this NS from EDNS size and ability. |
353 | #endif | |
b56b37cf | 354 | debugs(78, 3, "Added nameserver #" << nameservers.size()-1 << " (" << A << ")"); |
7b724b86 | 355 | } |
356 | ||
68836b58 | 357 | static void |
358 | idnsAddPathComponent(const char *buf) | |
359 | { | |
360 | if (npc == npc_alloc) { | |
361 | int oldalloc = npc_alloc; | |
362 | sp *oldptr = searchpath; | |
363 | ||
364 | if (0 == npc_alloc) | |
365 | npc_alloc = 2; | |
366 | else | |
367 | npc_alloc <<= 1; | |
368 | ||
369 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
370 | ||
371 | if (oldptr && oldalloc) | |
41d00cd3 | 372 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 373 | |
374 | if (oldptr) | |
375 | safe_free(oldptr); | |
376 | } | |
377 | ||
378 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
379 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
380 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 381 | Tolower(searchpath[npc].domain); |
bf8fe701 | 382 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 383 | ++npc; |
68836b58 | 384 | } |
385 | ||
68836b58 | 386 | static void |
387 | idnsFreeSearchpath(void) | |
388 | { | |
389 | safe_free(searchpath); | |
390 | npc = npc_alloc = 0; | |
391 | } | |
392 | ||
a079e38b | 393 | static bool |
efd900cb | 394 | idnsParseNameservers(void) |
395 | { | |
a079e38b | 396 | bool result = false; |
5a1098fb AJ |
397 | for (auto &i : Config.dns.nameservers) { |
398 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << i << " from squid.conf"); | |
399 | idnsAddNameserver(i.c_str()); | |
a079e38b | 400 | result = true; |
efd900cb | 401 | } |
a079e38b | 402 | return result; |
efd900cb | 403 | } |
404 | ||
a079e38b | 405 | static bool |
7b724b86 | 406 | idnsParseResolvConf(void) |
407 | { | |
a079e38b | 408 | bool result = false; |
a396d1f8 | 409 | #if !_SQUID_WINDOWS_ |
aa0ca030 | 410 | FILE *fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 411 | |
b69e9ffa AJ |
412 | if (!fp) { |
413 | int xerrno = errno; | |
414 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerr(xerrno)); | |
a079e38b | 415 | return false; |
7b724b86 | 416 | } |
62e76326 | 417 | |
aa0ca030 AJ |
418 | char buf[RESOLV_BUFSZ]; |
419 | const char *t = NULL; | |
68836b58 | 420 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 421 | t = strtok(buf, w_space); |
422 | ||
68836b58 | 423 | if (NULL == t) { |
62e76326 | 424 | continue; |
a37d6070 | 425 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 426 | t = strtok(NULL, w_space); |
62e76326 | 427 | |
68836b58 | 428 | if (NULL == t) |
429 | continue; | |
62e76326 | 430 | |
e0236918 | 431 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 432 | |
68836b58 | 433 | idnsAddNameserver(t); |
a079e38b | 434 | result = true; |
a37d6070 | 435 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
436 | idnsFreeSearchpath(); |
437 | t = strtok(NULL, w_space); | |
a083e75a | 438 | |
26ac0430 AJ |
439 | if (NULL == t) |
440 | continue; | |
a083e75a | 441 | |
e0236918 | 442 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 443 | |
26ac0430 | 444 | idnsAddPathComponent(t); |
a37d6070 | 445 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 446 | idnsFreeSearchpath(); |
68836b58 | 447 | while (NULL != t) { |
448 | t = strtok(NULL, w_space); | |
449 | ||
450 | if (NULL == t) | |
451 | continue; | |
452 | ||
e0236918 | 453 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 454 | |
455 | idnsAddPathComponent(t); | |
456 | } | |
a37d6070 | 457 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 458 | while (NULL != t) { |
459 | t = strtok(NULL, w_space); | |
62e76326 | 460 | |
68836b58 | 461 | if (NULL == t) |
462 | continue; | |
62e76326 | 463 | |
2c2da7d3 | 464 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 465 | ndots = atoi(t + 6); |
466 | ||
467 | if (ndots < 1) | |
468 | ndots = 1; | |
469 | ||
e0236918 | 470 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 471 | } |
472 | } | |
473 | } | |
7b724b86 | 474 | } |
a083e75a | 475 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
476 | t = strchr(t, '.'); |
477 | if (t) | |
478 | idnsAddPathComponent(t+1); | |
a083e75a | 479 | } |
62e76326 | 480 | |
7b724b86 | 481 | fclose(fp); |
aa0ca030 | 482 | #endif |
a079e38b | 483 | return result; |
7b724b86 | 484 | } |
485 | ||
be266cb2 | 486 | #if _SQUID_WINDOWS_ |
6b610e34 | 487 | static void |
d02b72b4 | 488 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 489 | { |
a16cb11f | 490 | char *t; |
6b610e34 | 491 | char *token; |
492 | HKEY hndKey; | |
493 | ||
0dde2160 | 494 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 495 | DWORD Type = 0; |
496 | DWORD Size = 0; | |
497 | LONG Result; | |
04f7fd38 | 498 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
499 | |
500 | if (Result == ERROR_SUCCESS && Size) { | |
501 | t = (char *) xmalloc(Size); | |
0dde2160 | 502 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 503 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
504 | idnsAddPathComponent(t); |
505 | xfree(t); | |
506 | } | |
04f7fd38 | 507 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 508 | |
509 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 510 | t = (char *) xmalloc(Size); |
04f7fd38 | 511 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 512 | token = strtok(t, Separator); |
6b610e34 | 513 | |
514 | while (token) { | |
515 | idnsAddPathComponent(token); | |
e0236918 | 516 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 517 | token = strtok(NULL, Separator); |
518 | } | |
26ac0430 | 519 | xfree(t); |
6b610e34 | 520 | } |
521 | ||
522 | RegCloseKey(hndKey); | |
523 | } | |
a6cae565 | 524 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
525 | t = strchr(t, '.'); |
526 | if (t) | |
527 | idnsAddPathComponent(t + 1); | |
a16cb11f | 528 | } |
6b610e34 | 529 | } |
530 | ||
a079e38b | 531 | static bool |
0e6d05ef | 532 | idnsParseWIN32Registry(void) |
533 | { | |
a16cb11f | 534 | char *t; |
0e6d05ef | 535 | char *token; |
536 | HKEY hndKey, hndKey2; | |
a079e38b | 537 | bool result = false; |
0e6d05ef | 538 | |
0e6d05ef | 539 | switch (WIN32_OS_version) { |
62e76326 | 540 | |
0e6d05ef | 541 | case _WIN_OS_WINNT: |
62e76326 | 542 | /* get nameservers from the Windows NT registry */ |
543 | ||
04f7fd38 | 544 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 545 | DWORD Type = 0; |
546 | DWORD Size = 0; | |
547 | LONG Result; | |
04f7fd38 | 548 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 549 | |
550 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 551 | t = (char *) xmalloc(Size); |
0dde2160 | 552 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 553 | token = strtok(t, ", "); |
62e76326 | 554 | |
555 | while (token) { | |
556 | idnsAddNameserver(token); | |
a079e38b | 557 | result = true; |
e0236918 | 558 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 559 | token = strtok(NULL, ","); |
62e76326 | 560 | } |
26ac0430 | 561 | xfree(t); |
62e76326 | 562 | } |
563 | ||
0dde2160 | 564 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 565 | |
566 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 567 | t = (char *) xmalloc(Size); |
a6cae565 | 568 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 569 | token = strtok(t, ", "); |
62e76326 | 570 | |
571 | while (token) { | |
e0236918 | 572 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 573 | idnsAddNameserver(token); |
a079e38b | 574 | result = true; |
62e76326 | 575 | token = strtok(NULL, ", "); |
576 | } | |
26ac0430 | 577 | xfree(t); |
62e76326 | 578 | } |
579 | ||
580 | RegCloseKey(hndKey); | |
581 | } | |
582 | ||
6b610e34 | 583 | idnsParseWIN32SearchList(" "); |
584 | ||
62e76326 | 585 | break; |
586 | ||
0e6d05ef | 587 | case _WIN_OS_WIN2K: |
62e76326 | 588 | |
b671cc68 | 589 | case _WIN_OS_WINXP: |
62e76326 | 590 | |
6b1846cf | 591 | case _WIN_OS_WINNET: |
28170269 | 592 | |
593 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
594 | |
595 | case _WIN_OS_WIN7: | |
62e76326 | 596 | /* get nameservers from the Windows 2000 registry */ |
597 | /* search all interfaces for DNS server addresses */ | |
598 | ||
04f7fd38 | 599 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 600 | int i; |
04f7fd38 AJ |
601 | DWORD MaxSubkeyLen, InterfacesCount; |
602 | char *keyname; | |
603 | FILETIME ftLastWriteTime; | |
604 | ||
605 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
606 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 607 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
608 | DWORD j; |
609 | j = MaxSubkeyLen; | |
610 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
611 | char *newkeyname; | |
612 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
613 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
614 | strcat(newkeyname, "\\"); | |
615 | strcat(newkeyname, keyname); | |
616 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
617 | DWORD Type = 0; | |
618 | DWORD Size = 0; | |
619 | LONG Result; | |
620 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
621 | if (Result == ERROR_SUCCESS && Size) { | |
622 | t = (char *) xmalloc(Size); | |
623 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
624 | token = strtok(t, ", "); | |
625 | while (token) { | |
e0236918 | 626 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 627 | idnsAddNameserver(token); |
a079e38b | 628 | result = true; |
04f7fd38 AJ |
629 | token = strtok(NULL, ", "); |
630 | } | |
631 | xfree(t); | |
632 | } | |
633 | ||
634 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
635 | if (Result == ERROR_SUCCESS && Size) { | |
636 | t = (char *) xmalloc(Size); | |
637 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
638 | token = strtok(t, ", "); | |
639 | while (token) { | |
e0236918 | 640 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 641 | idnsAddNameserver(token); |
a079e38b | 642 | result = true; |
04f7fd38 AJ |
643 | token = strtok(NULL, ", "); |
644 | } | |
645 | ||
646 | xfree(t); | |
62e76326 | 647 | } |
62e76326 | 648 | |
0dde2160 | 649 | RegCloseKey(hndKey2); |
62e76326 | 650 | } |
651 | ||
04f7fd38 | 652 | xfree(newkeyname); |
62e76326 | 653 | } |
654 | } | |
0dde2160 | 655 | |
04f7fd38 | 656 | xfree(keyname); |
62e76326 | 657 | } |
658 | ||
659 | RegCloseKey(hndKey); | |
660 | } | |
661 | ||
6b610e34 | 662 | idnsParseWIN32SearchList(", "); |
663 | ||
62e76326 | 664 | break; |
665 | ||
0e6d05ef | 666 | case _WIN_OS_WIN95: |
62e76326 | 667 | |
0e6d05ef | 668 | case _WIN_OS_WIN98: |
62e76326 | 669 | |
be20dac7 | 670 | case _WIN_OS_WINME: |
62e76326 | 671 | /* get nameservers from the Windows 9X registry */ |
672 | ||
04f7fd38 | 673 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 674 | DWORD Type = 0; |
675 | DWORD Size = 0; | |
676 | LONG Result; | |
04f7fd38 | 677 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 678 | |
679 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 680 | t = (char *) xmalloc(Size); |
a6cae565 | 681 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 682 | token = strtok(t, ", "); |
62e76326 | 683 | |
684 | while (token) { | |
e0236918 | 685 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 686 | idnsAddNameserver(token); |
a079e38b | 687 | result = true; |
62e76326 | 688 | token = strtok(NULL, ", "); |
689 | } | |
26ac0430 | 690 | xfree(t); |
62e76326 | 691 | } |
692 | ||
693 | RegCloseKey(hndKey); | |
694 | } | |
695 | ||
696 | break; | |
697 | ||
0e6d05ef | 698 | default: |
e0236918 | 699 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 700 | } |
a079e38b AJ |
701 | |
702 | return result; | |
0e6d05ef | 703 | } |
62e76326 | 704 | |
0e6d05ef | 705 | #endif |
706 | ||
7b724b86 | 707 | static void |
708 | idnsStats(StoreEntry * sentry) | |
709 | { | |
a16b4aa0 | 710 | dlink_node *n; |
711 | idns_query *q; | |
7cfc1c9a | 712 | int i; |
558be27a | 713 | int j; |
cc192b50 | 714 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 715 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 716 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 717 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
718 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
719 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 720 | |
a16b4aa0 | 721 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 722 | q = (idns_query *)n->data; |
bce61b00 | 723 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 724 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 725 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
726 | tvSubDsec(q->sent_t, current_time), |
727 | (q->permit_mdns? 'M':' '), | |
728 | q->name); | |
7cfc1c9a | 729 | } |
62e76326 | 730 | |
e210930b | 731 | if (Config.dns.packet_max > 0) |
bce61b00 | 732 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 733 | else |
bce61b00 | 734 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 735 | |
7cfc1c9a | 736 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
737 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
738 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 739 | |
b56b37cf | 740 | for (const auto &server : nameservers) { |
a079e38b | 741 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
b56b37cf AJ |
742 | server.S.toStr(buf,MAX_IPSTRLEN), |
743 | server.nqueries, | |
744 | server.nreplies, | |
745 | server.mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 746 | } |
62e76326 | 747 | |
558be27a | 748 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
749 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 750 | |
95dc7ff4 | 751 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 752 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
753 | ||
e210930b | 754 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 755 | |
95dc7ff4 | 756 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
757 | if (j > 10 && j < 16) |
758 | continue; // unassigned by IANA. | |
759 | ||
62e76326 | 760 | storeAppendPrintf(sentry, "%5d", j); |
761 | ||
95dc7ff4 | 762 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 763 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
764 | ||
e210930b | 765 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 766 | } |
6b610e34 | 767 | |
768 | if (npc) { | |
769 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
770 | ||
95dc7ff4 | 771 | for (i=0; i < npc; ++i) |
6b610e34 | 772 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
773 | ||
774 | storeAppendPrintf(sentry, "\n"); | |
775 | } | |
7b724b86 | 776 | } |
777 | ||
efd900cb | 778 | static void |
779 | idnsTickleQueue(void) | |
780 | { | |
781 | if (event_queued) | |
62e76326 | 782 | return; |
783 | ||
efd900cb | 784 | if (NULL == lru_list.tail) |
62e76326 | 785 | return; |
786 | ||
fd0f51c4 CT |
787 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
788 | ||
789 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 790 | |
efd900cb | 791 | event_queued = 1; |
792 | } | |
793 | ||
d24ef4e9 | 794 | static void |
ced8def3 | 795 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag flag, int, void *data) |
d24ef4e9 | 796 | { |
797 | nsvc * vc = (nsvc *)data; | |
798 | ||
c8407295 | 799 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 800 | return; |
af6a12ee | 801 | |
e0d28505 AJ |
802 | // XXX: irrelevant now that we have conn pointer? |
803 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 804 | return; |
d24ef4e9 | 805 | |
c8407295 | 806 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 807 | conn->close(); |
d24ef4e9 | 808 | return; |
809 | } | |
810 | ||
811 | vc->busy = 0; | |
812 | idnsDoSendQueryVC(vc); | |
813 | } | |
814 | ||
815 | static void | |
816 | idnsDoSendQueryVC(nsvc *vc) | |
817 | { | |
818 | if (vc->busy) | |
819 | return; | |
820 | ||
032785bf | 821 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 822 | return; |
823 | ||
8401d6fc AR |
824 | // if retrying after a TC UDP response, our close handler cb may be pending |
825 | if (fd_table[vc->conn->fd].closing()) | |
826 | return; | |
827 | ||
032785bf | 828 | MemBuf *mb = vc->queue; |
d24ef4e9 | 829 | |
032785bf | 830 | vc->queue = new MemBuf; |
d24ef4e9 | 831 | |
832 | vc->busy = 1; | |
833 | ||
fd0f51c4 | 834 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
835 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
836 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 837 | AsyncCall::Pointer nil; |
d4b21972 | 838 | |
1b76e6c1 | 839 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 840 | |
ec41b64c AJ |
841 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
842 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 843 | Comm::Write(vc->conn, mb, call); |
032785bf | 844 | |
845 | delete mb; | |
d24ef4e9 | 846 | } |
847 | ||
848 | static void | |
ced8def3 | 849 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int, void *data) |
d24ef4e9 | 850 | { |
851 | nsvc * vc = (nsvc *)data; | |
852 | ||
c8407295 | 853 | if (status != Comm::OK || !conn) { |
dd3fb890 | 854 | char buf[MAX_IPSTRLEN] = ""; |
b56b37cf | 855 | if (vc->ns < nameservers.size()) |
4dd643d5 | 856 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 857 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 858 | return; |
859 | } | |
860 | ||
00406b24 | 861 | vc->conn = conn; |
cfd66529 AJ |
862 | |
863 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
864 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
865 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
866 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 867 | vc->busy = 0; |
868 | idnsDoSendQueryVC(vc); | |
869 | } | |
870 | ||
871 | static void | |
575d05c4 | 872 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 873 | { |
575d05c4 | 874 | nsvc * vc = (nsvc *)params.data; |
907a7a05 AJ |
875 | delete vc; |
876 | } | |
877 | ||
878 | nsvc::~nsvc() | |
879 | { | |
880 | delete queue; | |
881 | delete msg; | |
b56b37cf | 882 | if (ns < nameservers.size()) // XXX: idnsShutdownAndFreeState may have freed nameservers[] |
907a7a05 | 883 | nameservers[ns].vc = NULL; |
d24ef4e9 | 884 | } |
885 | ||
886 | static void | |
b56b37cf | 887 | idnsInitVC(size_t nsv) |
d24ef4e9 | 888 | { |
b56b37cf | 889 | assert(nsv < nameservers.size()); |
907a7a05 | 890 | nsvc *vc = new nsvc(nsv); |
00406b24 | 891 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d | 892 | nameservers[nsv].vc = vc; |
d24ef4e9 | 893 | |
00406b24 | 894 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 895 | |
4dd643d5 | 896 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 897 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 898 | else |
7fb5be3e | 899 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 900 | |
7fb5be3e | 901 | if (conn->remote.isIPv4()) |
4dd643d5 | 902 | conn->local.setIPv4(); |
f5ba22ff | 903 | |
cfd66529 | 904 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 905 | |
4accd6d8 | 906 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 907 | cs->setHost("DNS TCP Socket"); |
855150a4 | 908 | AsyncJob::Start(cs); |
d24ef4e9 | 909 | } |
910 | ||
911 | static void | |
b56b37cf | 912 | idnsSendQueryVC(idns_query * q, size_t nsn) |
d24ef4e9 | 913 | { |
b56b37cf | 914 | assert(nsn < nameservers.size()); |
9dca980d AJ |
915 | if (nameservers[nsn].vc == NULL) |
916 | idnsInitVC(nsn); | |
d24ef4e9 | 917 | |
9dca980d | 918 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 919 | |
445962f3 HN |
920 | if (!vc) { |
921 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 922 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
923 | |
924 | return; | |
925 | } | |
926 | ||
2fe7eff9 | 927 | vc->queue->reset(); |
d24ef4e9 | 928 | |
929 | short head = htons(q->sz); | |
930 | ||
2fe7eff9 | 931 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 932 | |
2fe7eff9 | 933 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 934 | |
935 | idnsDoSendQueryVC(vc); | |
936 | } | |
937 | ||
7b724b86 | 938 | static void |
939 | idnsSendQuery(idns_query * q) | |
940 | { | |
ee58de20 AJ |
941 | // XXX: DNS sockets get closed during reconfigure produces a race between |
942 | // any already active connections (or ones received between closing DNS | |
943 | // sockets and server listening sockets) and the reconfigure completing | |
944 | // (Runner syncConfig() being run). Transactions which loose this race will | |
945 | // produce DNS timeouts (or whatever the caller set) as their queries never | |
946 | // get queued to be re-tried after the DNS socekts are re-opened. | |
947 | ||
4d6c8504 | 948 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 949 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 950 | return; |
0a69973e | 951 | } |
62e76326 | 952 | |
b56b37cf | 953 | if (nameservers.empty()) { |
e0236918 | 954 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 955 | return; |
956 | } | |
62e76326 | 957 | |
7b724b86 | 958 | assert(q->lru.next == NULL); |
62e76326 | 959 | |
7b724b86 | 960 | assert(q->lru.prev == NULL); |
62e76326 | 961 | |
4d6c8504 | 962 | int x = -1, y = -1; |
b56b37cf AJ |
963 | size_t nsn; |
964 | const auto nsCount = nameservers.size(); | |
4d6c8504 | 965 | |
213b6c90 | 966 | do { |
a079e38b AJ |
967 | // only use mDNS resolvers for mDNS compatible queries |
968 | if (!q->permit_mdns) | |
b56b37cf | 969 | nsn = nns_mdns_count + q->nsends % (nsCount - nns_mdns_count); |
a079e38b | 970 | else |
b56b37cf | 971 | nsn = q->nsends % nsCount; |
213b6c90 AJ |
972 | |
973 | if (q->need_vc) { | |
9dca980d | 974 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 975 | x = y = 0; |
213b6c90 | 976 | } else { |
4dd643d5 | 977 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 978 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 979 | else if (DnsSocketA >= 0) |
9dca980d | 980 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 981 | } |
b69e9ffa | 982 | int xerrno = errno; |
62e76326 | 983 | |
95dc7ff4 | 984 | ++ q->nsends; |
62e76326 | 985 | |
33ab4aaf | 986 | q->sent_t = current_time; |
62e76326 | 987 | |
4dd643d5 | 988 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
b69e9ffa | 989 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << DnsSocketB << ": sendto: " << xstrerr(xerrno)); |
4dd643d5 | 990 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
b69e9ffa | 991 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << DnsSocketA << ": sendto: " << xstrerr(xerrno)); |
4d6c8504 | 992 | |
b56b37cf | 993 | } while ( (x<0 && y<0) && q->nsends % nsCount != 0); |
62e76326 | 994 | |
bd6a0c8f | 995 | if (y > 0) { |
4d6c8504 | 996 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 997 | } |
bd6a0c8f | 998 | if (x > 0) { |
4d6c8504 | 999 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 1000 | } |
62e76326 | 1001 | |
9dca980d | 1002 | ++ nameservers[nsn].nqueries; |
c131f066 | 1003 | q->queue_t = current_time; |
7b724b86 | 1004 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 1005 | q->pending = 1; |
efd900cb | 1006 | idnsTickleQueue(); |
7b724b86 | 1007 | } |
1008 | ||
1009 | static int | |
b7ac5457 | 1010 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 1011 | { |
b56b37cf | 1012 | for (int i = 0; static_cast<size_t>(i) < nameservers.size(); ++i) { |
cc192b50 | 1013 | if (nameservers[i].S != from) |
62e76326 | 1014 | continue; |
1015 | ||
4dd643d5 | 1016 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 1017 | continue; |
1018 | ||
1019 | return i; | |
7b724b86 | 1020 | } |
62e76326 | 1021 | |
7cfc1c9a | 1022 | return -1; |
7b724b86 | 1023 | } |
1024 | ||
1025 | static idns_query * | |
1026 | idnsFindQuery(unsigned short id) | |
1027 | { | |
1028 | dlink_node *n; | |
1029 | idns_query *q; | |
62e76326 | 1030 | |
7b724b86 | 1031 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1032 | q = (idns_query*)n->data; |
1033 | ||
049441d9 | 1034 | if (q->query_id == id) |
62e76326 | 1035 | return q; |
7b724b86 | 1036 | } |
62e76326 | 1037 | |
7b724b86 | 1038 | return NULL; |
1039 | } | |
1040 | ||
108d67a0 | 1041 | static unsigned short |
011b1672 | 1042 | idnsQueryID() |
108d67a0 | 1043 | { |
011b1672 AJ |
1044 | // NP: apparently ranlux are faster, but not quite as "proven" |
1045 | static std::mt19937 mt(static_cast<uint32_t>(getCurrentTime() & 0xFFFFFFFF)); | |
1046 | unsigned short id = mt() & 0xFFFF; | |
108d67a0 | 1047 | unsigned short first_id = id; |
1048 | ||
011b1672 | 1049 | // ensure temporal uniqueness by looking for an existing use |
26ac0430 | 1050 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1051 | ++id; |
108d67a0 | 1052 | |
846c8960 | 1053 | if (id == first_id) { |
e0236918 | 1054 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1055 | break; |
846c8960 | 1056 | } |
108d67a0 | 1057 | } |
1058 | ||
846c8960 | 1059 | return id; |
108d67a0 | 1060 | } |
1061 | ||
fd9c47d1 AR |
1062 | /// \returns whether master or associated queries are still waiting for replies |
1063 | static bool | |
1064 | idnsStillPending(const idns_query *master) | |
3074b9d1 | 1065 | { |
fd9c47d1 AR |
1066 | assert(!master->master); // we were given the master transaction |
1067 | for (const idns_query *qi = master; qi; qi = qi->slave) { | |
1068 | if (qi->pending) | |
1069 | return true; | |
1070 | } | |
1071 | return false; | |
1072 | } | |
3074b9d1 | 1073 | |
fd9c47d1 AR |
1074 | static std::ostream & |
1075 | operator <<(std::ostream &os, const idns_query &answered) | |
1076 | { | |
1077 | if (answered.error) | |
1078 | os << "error \"" << answered.error << "\""; | |
1079 | else | |
1080 | os << answered.ancount << " records"; | |
1081 | return os; | |
1082 | } | |
33ab4aaf | 1083 | |
fd9c47d1 AR |
1084 | static void |
1085 | idnsCallbackOnEarlyError(IDNSCB *callback, void *cbdata, const char *error) | |
1086 | { | |
1087 | // A cbdataReferenceValid() check asserts on unlocked cbdata: Early errors, | |
1088 | // by definition, happen before we store/cbdataReference() cbdata. | |
1089 | debugs(78, 6, "\"" << error << "\" for " << cbdata); | |
1090 | callback(cbdata, nullptr, 0, "Internal error", true); // hide error details | |
1091 | } | |
33ab4aaf | 1092 | |
fd9c47d1 AR |
1093 | /// safely sends one set of DNS records (or an error) to the caller |
1094 | static bool | |
1095 | idnsCallbackOneWithAnswer(IDNSCB *callback, void *cbdata, const idns_query &answered, const bool lastAnswer) | |
1096 | { | |
1097 | if (!cbdataReferenceValid(cbdata)) | |
1098 | return false; | |
1099 | const rfc1035_rr *records = answered.message ? answered.message->answer : nullptr; | |
1100 | debugs(78, 6, (lastAnswer ? "last " : "") << answered << " for " << cbdata); | |
1101 | callback(cbdata, records, answered.ancount, answered.error, lastAnswer); | |
1102 | return true; | |
1103 | } | |
33ab4aaf | 1104 | |
fd9c47d1 AR |
1105 | static void |
1106 | idnsCallbackNewCallerWithOldAnswers(IDNSCB *callback, void *cbdata, const idns_query * const master) | |
1107 | { | |
1108 | const bool lastAnswer = false; | |
1109 | // iterate all queries to act on answered ones | |
1110 | for (auto query = master; query; query = query->slave) { | |
1111 | if (query->pending) | |
1112 | continue; // no answer yet | |
cd2a20f7 | 1113 | // no CallBack(CodeContext...) -- we always run in requestor's context |
fd9c47d1 AR |
1114 | if (!idnsCallbackOneWithAnswer(callback, cbdata, *query, lastAnswer)) |
1115 | break; // the caller disappeared | |
33ab4aaf | 1116 | } |
fd9c47d1 | 1117 | } |
33ab4aaf | 1118 | |
fd9c47d1 AR |
1119 | static void |
1120 | idnsCallbackAllCallersWithNewAnswer(const idns_query * const answered, const bool lastAnswer) | |
1121 | { | |
1122 | debugs(78, 8, (lastAnswer ? "last " : "") << *answered); | |
1123 | const auto master = answered->master ? answered->master : answered; | |
1124 | // iterate all queued lookup callers | |
1125 | for (auto looker = master; looker; looker = looker->queue) { | |
cd2a20f7 AR |
1126 | CallBack(looker->codeContext, [&] { |
1127 | (void)idnsCallbackOneWithAnswer(looker->callback, looker->callback_data, | |
1128 | *answered, lastAnswer); | |
1129 | }); | |
fd9c47d1 AR |
1130 | } |
1131 | } | |
3074b9d1 | 1132 | |
fd9c47d1 AR |
1133 | static void |
1134 | idnsCallback(idns_query *q, const char *error) | |
1135 | { | |
1136 | if (error) | |
1137 | q->error = error; | |
907a7a05 | 1138 | |
fd9c47d1 | 1139 | auto master = q->master ? q->master : q; |
3074b9d1 | 1140 | |
fd9c47d1 AR |
1141 | const bool lastAnswer = !idnsStillPending(master); |
1142 | idnsCallbackAllCallersWithNewAnswer(q, lastAnswer); | |
3074b9d1 | 1143 | |
fd9c47d1 AR |
1144 | if (!lastAnswer) |
1145 | return; // wait for more answers | |
3074b9d1 | 1146 | |
fd9c47d1 AR |
1147 | if (master->hash.key) { |
1148 | hash_remove_link(idns_lookup_hash, &master->hash); | |
1149 | master->hash.key = nullptr; | |
3074b9d1 | 1150 | } |
33ab4aaf | 1151 | |
fd9c47d1 | 1152 | delete master; |
3074b9d1 | 1153 | } |
1154 | ||
7b724b86 | 1155 | static void |
ced8def3 | 1156 | idnsGrokReply(const char *buf, size_t sz, int /*from_ns*/) |
7b724b86 | 1157 | { |
ec7bade0 | 1158 | rfc1035_message *message = NULL; |
3074b9d1 | 1159 | |
907a7a05 | 1160 | int n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1161 | |
ec7bade0 | 1162 | if (message == NULL) { |
e0236918 | 1163 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1164 | return; |
7b724b86 | 1165 | } |
62e76326 | 1166 | |
91dcbd43 | 1167 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1168 | |
907a7a05 | 1169 | idns_query *q = idnsFindQuery(message->id); |
ec7bade0 | 1170 | |
7b724b86 | 1171 | if (q == NULL) { |
bf8fe701 | 1172 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1173 | rfc1035MessageDestroy(&message); |
62e76326 | 1174 | return; |
7b724b86 | 1175 | } |
62e76326 | 1176 | |
9e1f210d | 1177 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1178 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1179 | rfc1035MessageDestroy(&message); |
9e1f210d | 1180 | return; |
1181 | } | |
1182 | ||
e210930b AJ |
1183 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1184 | // TODO: actually gr the message right here. | |
f53969cc SM |
1185 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q |
1186 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1187 | // AND allows us to merge AN+AR sections from both responses (one day) | |
e210930b AJ |
1188 | |
1189 | if (q->edns_seen >= 0) { | |
1190 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1191 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1192 | // the altered NS was limiting the whole group. | |
1193 | max_shared_edns = q->edns_seen; | |
1194 | // may be limited by one of the others still | |
b56b37cf AJ |
1195 | for (const auto &server : nameservers) |
1196 | max_shared_edns = min(max_shared_edns, server.last_seen_edns); | |
e210930b AJ |
1197 | } else { |
1198 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1199 | // maybe reduce the global limit downwards to accomodate this NS | |
1200 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1201 | } | |
1202 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1203 | max_shared_edns = -1; | |
1204 | } | |
1205 | #endif | |
1206 | ||
049441d9 HN |
1207 | dlinkDelete(&q->lru, &lru_list); |
1208 | q->pending = 0; | |
1209 | ||
d24ef4e9 | 1210 | if (message->tc) { |
bae9832d | 1211 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1212 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1213 | |
1214 | if (!q->need_vc) { | |
1215 | q->need_vc = 1; | |
5e263176 | 1216 | -- q->nsends; |
d24ef4e9 | 1217 | idnsSendQuery(q); |
91dcbd43 CT |
1218 | } else { |
1219 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1220 | // Return an error and cleanup; no point in trying TCP again. | |
1221 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1222 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1223 | } |
1224 | ||
1225 | return; | |
1226 | } | |
9e1f210d | 1227 | |
558be27a | 1228 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1229 | |
558be27a | 1230 | if (n < 0) { |
7ba8d0b8 | 1231 | q->rcode = -n; |
42687bb2 | 1232 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1233 | |
95dc7ff4 | 1234 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1235 | /* |
1236 | * RCODE 2 is "Server failure - The name server was | |
1237 | * unable to process this query due to a problem with | |
1238 | * the name server." | |
1239 | */ | |
cc192b50 | 1240 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1241 | rfc1035MessageDestroy(&message); | |
62e76326 | 1242 | idnsSendQuery(q); |
1243 | return; | |
1244 | } | |
68836b58 | 1245 | |
0e6432d0 HN |
1246 | // Do searchpath processing on the master A query only to keep |
1247 | // things simple. NXDOMAIN is authorative for the label, not | |
1248 | // the record type. | |
049441d9 | 1249 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1250 | assert(NULL == message->answer); |
1251 | strcpy(q->name, q->orig); | |
1252 | ||
cc192b50 | 1253 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1254 | ||
68836b58 | 1255 | if (q->domain < npc) { |
1256 | strcat(q->name, "."); | |
1257 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1258 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1259 | ++ q->domain; |
68836b58 | 1260 | } else { |
95dc7ff4 | 1261 | ++ q->attempt; |
68836b58 | 1262 | } |
1263 | ||
049441d9 | 1264 | rfc1035MessageDestroy(&message); |
cc192b50 | 1265 | |
33ab4aaf | 1266 | // cleanup slave AAAA query |
049441d9 HN |
1267 | while (idns_query *slave = q->slave) { |
1268 | dlinkDelete(&slave->lru, &lru_list); | |
1269 | q->slave = slave->slave; | |
907a7a05 AJ |
1270 | slave->slave = NULL; |
1271 | delete slave; | |
cc192b50 | 1272 | } |
c7ba545e | 1273 | |
049441d9 HN |
1274 | // Build new query |
1275 | q->query_id = idnsQueryID(); | |
1276 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1277 | // see EDNS notes at top of file why this sends 0 | |
1278 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1279 | if (q->sz < 0) { |
1280 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1281 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1282 | return; |
1283 | } | |
1284 | ||
33ab4aaf HN |
1285 | q->nsends = 0; |
1286 | ||
a079e38b | 1287 | idnsCheckMDNS(q); |
68836b58 | 1288 | idnsSendQuery(q); |
049441d9 HN |
1289 | if (Ip::EnableIpv6) |
1290 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1291 | return; |
1292 | } | |
558be27a | 1293 | } |
62e76326 | 1294 | |
049441d9 HN |
1295 | q->message = message; |
1296 | q->ancount = n; | |
cc192b50 | 1297 | |
33ab4aaf HN |
1298 | if (n >= 0) |
1299 | idnsCallback(q, NULL); | |
1300 | else | |
1301 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1302 | |
7b724b86 | 1303 | } |
1304 | ||
1305 | static void | |
ced8def3 | 1306 | idnsRead(int fd, void *) |
7b724b86 | 1307 | { |
d193a436 | 1308 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1309 | int len; |
42b51993 | 1310 | int max = INCOMING_DNS_MAX; |
d29b40de | 1311 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1312 | Ip::Address from; |
cc192b50 | 1313 | |
d7e7eaa7 | 1314 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1315 | |
bd6a0c8f HN |
1316 | // Always keep reading. This stops (or at least makes harder) several |
1317 | // attacks on the DNS client. | |
d841c88d | 1318 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1319 | |
cc192b50 | 1320 | /* BUG (UNRESOLVED) |
1321 | * two code lines after returning from comm_udprecvfrom() | |
1322 | * something overwrites the memory behind the from parameter. | |
1323 | * NO matter where in the stack declaration list above it is placed | |
1324 | * The cause of this is still unknown, however copying the data appears | |
1325 | * to allow it to be passed further without this erasure. | |
1326 | */ | |
b7ac5457 | 1327 | Ip::Address bugbypass; |
62e76326 | 1328 | |
5e263176 FC |
1329 | while (max) { |
1330 | --max; | |
cc192b50 | 1331 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1332 | |
cc192b50 | 1333 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1334 | |
1335 | if (len == 0) | |
1336 | break; | |
1337 | ||
1338 | if (len < 0) { | |
b69e9ffa AJ |
1339 | int xerrno = errno; |
1340 | if (ignoreErrno(xerrno)) | |
62e76326 | 1341 | break; |
1342 | ||
1191b93b | 1343 | #if _SQUID_LINUX_ |
62e76326 | 1344 | /* Some Linux systems seem to set the FD for reading and then |
1345 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1346 | * port unreachable message. */ | |
1347 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
b69e9ffa | 1348 | if (xerrno != ECONNREFUSED && xerrno != EHOSTUNREACH) |
7b724b86 | 1349 | #endif |
b69e9ffa | 1350 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << fd << " recvfrom: " << xstrerr(xerrno)); |
62e76326 | 1351 | |
1352 | break; | |
1353 | } | |
1354 | ||
055421ee | 1355 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1356 | |
62e76326 | 1357 | assert(N); |
aec55359 | 1358 | ++(*N); |
cc192b50 | 1359 | |
1360 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1361 | ||
1362 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1363 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1364 | |
9dca980d AJ |
1365 | if (nsn >= 0) { |
1366 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1367 | } |
1368 | ||
1369 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1370 | // but after the ++ above to keep statistics right. | |
1371 | if (!lru_list.head) | |
1372 | continue; // Don't process replies if there is no pending query. | |
1373 | ||
9dca980d | 1374 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1375 | static time_t last_warning = 0; |
1376 | ||
1377 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1378 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1379 | last_warning = squid_curtime; |
26ac0430 | 1380 | } else { |
e0236918 | 1381 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1382 | } |
1383 | continue; | |
62e76326 | 1384 | } |
1385 | ||
9dca980d | 1386 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1387 | } |
1388 | } | |
1389 | ||
7cfc1c9a | 1390 | static void |
ced8def3 | 1391 | idnsCheckQueue(void *) |
7cfc1c9a | 1392 | { |
1393 | dlink_node *n; | |
0c4fe9e4 | 1394 | dlink_node *p = NULL; |
7cfc1c9a | 1395 | idns_query *q; |
1396 | event_queued = 0; | |
62e76326 | 1397 | |
b56b37cf | 1398 | if (nameservers.empty()) |
820ee9fa AJ |
1399 | /* name servers went away; reconfiguring or shutting down */ |
1400 | return; | |
1401 | ||
b56b37cf | 1402 | const auto nsCount = nameservers.size(); |
0c4fe9e4 | 1403 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1404 | |
820ee9fa | 1405 | p = n->prev; |
733cedc0 | 1406 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1407 | |
820ee9fa | 1408 | /* Anything to process in the queue? */ |
fd0f51c4 | 1409 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1410 | break; |
62e76326 | 1411 | |
33ab4aaf | 1412 | /* Query timer still running? */ |
b56b37cf | 1413 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nsCount))) { |
820ee9fa AJ |
1414 | dlinkDelete(&q->lru, &lru_list); |
1415 | q->queue_t = current_time; | |
1416 | dlinkAdd(q, &q->lru, &lru_list); | |
1417 | continue; | |
1418 | } | |
62e76326 | 1419 | |
91dcbd43 CT |
1420 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1421 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1422 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1423 | |
1424 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1425 | q->pending = 0; |
62e76326 | 1426 | |
fd0f51c4 | 1427 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1428 | idnsSendQuery(q); |
1429 | } else { | |
91dcbd43 | 1430 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1431 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1432 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1433 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1434 | |
1435 | if (q->rcode != 0) | |
33ab4aaf | 1436 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1437 | else |
33ab4aaf | 1438 | idnsCallback(q, "Timeout"); |
62e76326 | 1439 | } |
7cfc1c9a | 1440 | } |
62e76326 | 1441 | |
efd900cb | 1442 | idnsTickleQueue(); |
7cfc1c9a | 1443 | } |
1444 | ||
d24ef4e9 | 1445 | static void |
ced8def3 | 1446 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1447 | { |
1448 | nsvc * vc = (nsvc *)data; | |
1449 | ||
c8407295 | 1450 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1451 | return; |
1452 | ||
c8407295 | 1453 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1454 | if (Comm::IsConnOpen(conn)) |
1455 | conn->close(); | |
d24ef4e9 | 1456 | return; |
1457 | } | |
1458 | ||
bd6a0c8f | 1459 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1460 | |
032785bf | 1461 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1462 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1463 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1464 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1465 | return; |
1466 | } | |
1467 | ||
b56b37cf | 1468 | assert(vc->ns < nameservers.size()); |
e0d28505 | 1469 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1470 | |
e210930b | 1471 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1472 | vc->msg->clean(); |
abd8f140 AJ |
1473 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1474 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1475 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1476 | } |
1477 | ||
1478 | static void | |
ced8def3 | 1479 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1480 | { |
1481 | nsvc * vc = (nsvc *)data; | |
1482 | ||
c8407295 | 1483 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1484 | return; |
1485 | ||
c8407295 | 1486 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1487 | if (Comm::IsConnOpen(conn)) |
1488 | conn->close(); | |
d24ef4e9 | 1489 | return; |
1490 | } | |
1491 | ||
1492 | vc->read_msglen += len; | |
1493 | ||
1494 | assert(vc->read_msglen <= 2); | |
1495 | ||
1496 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1497 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1498 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1499 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1500 | return; |
1501 | } | |
1502 | ||
1503 | vc->read_msglen = 0; | |
1504 | ||
1505 | vc->msglen = ntohs(vc->msglen); | |
1506 | ||
8185c30b SS |
1507 | if (!vc->msglen) { |
1508 | if (Comm::IsConnOpen(conn)) | |
1509 | conn->close(); | |
1510 | return; | |
1511 | } | |
1512 | ||
2fe7eff9 | 1513 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1514 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1515 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1516 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1517 | } |
1518 | ||
558be27a | 1519 | /* |
1520 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1521 | */ | |
1522 | static void | |
1523 | idnsRcodeCount(int rcode, int attempt) | |
1524 | { | |
1525 | if (rcode > 0) | |
62e76326 | 1526 | rcode = 0; |
558be27a | 1527 | else if (rcode < 0) |
62e76326 | 1528 | rcode = -rcode; |
1529 | ||
558be27a | 1530 | if (rcode < MAX_RCODE) |
62e76326 | 1531 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1532 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1533 | } |
1534 | ||
7b724b86 | 1535 | void |
4a3b98d7 | 1536 | Dns::Init(void) |
7b724b86 | 1537 | { |
1538 | static int init = 0; | |
62e76326 | 1539 | |
4d6c8504 | 1540 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
61beade2 | 1541 | Ip::Address addrV6; // since we do not want to alter Config.Addrs.udp_* and do not have one of our own. |
62e76326 | 1542 | |
4dd643d5 | 1543 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1544 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1545 | else |
049441d9 | 1546 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1547 | |
049441d9 | 1548 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1549 | addrV4.setIPv4(); |
7e07ced1 | 1550 | |
4dd643d5 | 1551 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1552 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1553 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1554 | IPPROTO_UDP, |
049441d9 | 1555 | addrV6, |
04f7fd38 | 1556 | COMM_NONBLOCKING, |
055421ee | 1557 | "DNS Socket IPv6"); |
7e07ced1 | 1558 | } |
4d6c8504 | 1559 | |
4dd643d5 | 1560 | if (addrV4.isIPv4()) { |
049441d9 | 1561 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1562 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1563 | IPPROTO_UDP, |
049441d9 | 1564 | addrV4, |
04f7fd38 | 1565 | COMM_NONBLOCKING, |
055421ee | 1566 | "DNS Socket IPv4"); |
7e07ced1 | 1567 | } |
62e76326 | 1568 | |
4d6c8504 | 1569 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1570 | fatal("Could not create a DNS socket"); |
1571 | ||
1572 | /* Ouch... we can't call functions using debug from a debug | |
1573 | * statement. Doing so messes up the internal Debug::level | |
1574 | */ | |
04f7fd38 | 1575 | if (DnsSocketB >= 0) { |
e91e2a72 | 1576 | comm_local_port(DnsSocketB); |
e0236918 | 1577 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1578 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1579 | } |
04f7fd38 | 1580 | if (DnsSocketA >= 0) { |
e91e2a72 | 1581 | comm_local_port(DnsSocketA); |
e0236918 | 1582 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1583 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1584 | } |
7b724b86 | 1585 | } |
62e76326 | 1586 | |
b56b37cf | 1587 | assert(nameservers.empty()); |
a079e38b AJ |
1588 | idnsAddMDNSNameservers(); |
1589 | bool nsFound = idnsParseNameservers(); | |
62e76326 | 1590 | |
a079e38b AJ |
1591 | if (!nsFound) |
1592 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1593 | |
be266cb2 | 1594 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1595 | if (!nsFound) |
1596 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1597 | #endif |
62e76326 | 1598 | |
a079e38b | 1599 | if (!nsFound) { |
e0236918 | 1600 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1601 | #if _SQUID_WINDOWS_ |
e0236918 | 1602 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1603 | #else |
e0236918 | 1604 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1605 | #endif |
29fe9bd5 | 1606 | |
e0236918 | 1607 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1608 | if (Ip::EnableIpv6) |
1609 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1610 | idnsAddNameserver("127.0.0.1"); |
1611 | } | |
62e76326 | 1612 | |
7b724b86 | 1613 | if (!init) { |
62e76326 | 1614 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1615 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1616 | ++init; |
7b724b86 | 1617 | } |
372fb44e | 1618 | |
e210930b AJ |
1619 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1620 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1621 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1622 | max_shared_edns = -1; // disable if we might receive random replies. | |
1623 | } | |
1624 | #endif | |
1625 | ||
4a3b98d7 | 1626 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
7b724b86 | 1627 | } |
1628 | ||
ee58de20 AJ |
1629 | static void |
1630 | idnsShutdownAndFreeState(const char *reason) | |
7b724b86 | 1631 | { |
4d6c8504 | 1632 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1633 | return; |
1634 | ||
ee58de20 AJ |
1635 | debugs(78, 2, reason << ": Closing DNS sockets"); |
1636 | ||
04f7fd38 | 1637 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1638 | comm_close(DnsSocketA); |
1639 | DnsSocketA = -1; | |
1640 | } | |
62e76326 | 1641 | |
055421ee | 1642 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1643 | comm_close(DnsSocketB); |
1644 | DnsSocketB = -1; | |
1645 | } | |
62e76326 | 1646 | |
b56b37cf AJ |
1647 | for (const auto &server : nameservers) { |
1648 | if (const auto vc = server.vc) { | |
00406b24 AJ |
1649 | if (Comm::IsConnOpen(vc->conn)) |
1650 | vc->conn->close(); | |
b26754c4 | 1651 | } |
1652 | } | |
1653 | ||
dd3fb890 | 1654 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
b56b37cf | 1655 | nameservers.clear(); |
68836b58 | 1656 | idnsFreeSearchpath(); |
7b724b86 | 1657 | } |
1658 | ||
ee58de20 AJ |
1659 | void |
1660 | Dns::ConfigRr::endingShutdown() | |
1661 | { | |
1662 | idnsShutdownAndFreeState("Shutdown"); | |
1663 | } | |
1664 | ||
1665 | void | |
1666 | Dns::ConfigRr::startReconfigure() | |
1667 | { | |
1668 | idnsShutdownAndFreeState("Reconfigure"); | |
1669 | } | |
1670 | ||
3074b9d1 | 1671 | static int |
1672 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1673 | { | |
3074b9d1 | 1674 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); |
1675 | ||
1676 | if (!old) | |
1677 | return 0; | |
1678 | ||
55622953 CT |
1679 | // XXX: We are collapsing this DNS query (B) onto another one (A), but there |
1680 | // is no code to later send B if the A answer has unshareable 0 TTL records. | |
1681 | ||
907a7a05 | 1682 | idns_query *q = new idns_query; |
049441d9 | 1683 | // no query_id on this instance. |
3074b9d1 | 1684 | |
1685 | q->callback = callback; | |
3074b9d1 | 1686 | q->callback_data = cbdataReference(data); |
1687 | ||
1688 | q->queue = old->queue; | |
3074b9d1 | 1689 | old->queue = q; |
1690 | ||
fd9c47d1 AR |
1691 | // This check must follow cbdataReference() above because our callback code |
1692 | // needs a locked cbdata to call cbdataReferenceValid(). | |
1693 | if (idnsStillPending(old)) | |
1694 | idnsCallbackNewCallerWithOldAnswers(callback, data, old); | |
1695 | // else: idns_lookup_hash is not a cache so no pending lookups means we are | |
1696 | // in a reentrant lookup and will be called back when dequeued. | |
1697 | ||
3074b9d1 | 1698 | return 1; |
1699 | } | |
1700 | ||
1701 | static void | |
33ab4aaf | 1702 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1703 | { |
33ab4aaf HN |
1704 | q->start_t = current_time; |
1705 | q->callback = callback; | |
1706 | q->callback_data = cbdataReference(data); | |
1707 | ||
049441d9 | 1708 | q->hash.key = q->orig; |
3074b9d1 | 1709 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1710 | |
1711 | idnsSendQuery(q); | |
3074b9d1 | 1712 | } |
1713 | ||
049441d9 HN |
1714 | static void |
1715 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1716 | { | |
907a7a05 | 1717 | idns_query *q = new idns_query; |
049441d9 HN |
1718 | memcpy(q->name, master->name, sizeof(q->name)); |
1719 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1720 | q->master = master; | |
1721 | q->query_id = idnsQueryID(); | |
1722 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
c7ba545e | 1723 | |
cafb131e | 1724 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1725 | ", id = 0x" << std::hex << q->query_id); |
1726 | if (!q->sz) { | |
907a7a05 | 1727 | delete q; |
049441d9 HN |
1728 | return; |
1729 | } | |
907a7a05 AJ |
1730 | |
1731 | q->start_t = master->start_t; | |
1732 | q->slave = master->slave; | |
1733 | ||
a079e38b | 1734 | idnsCheckMDNS(q); |
049441d9 HN |
1735 | master->slave = q; |
1736 | idnsSendQuery(q); | |
1737 | } | |
1738 | ||
7b724b86 | 1739 | void |
1740 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1741 | { | |
32f89713 NH |
1742 | size_t nameLength = strlen(name); |
1743 | ||
1744 | // Prevent buffer overflow on q->name | |
1745 | if (nameLength > NS_MAXDNAME) { | |
1746 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
fd9c47d1 | 1747 | idnsCallbackOnEarlyError(callback, data, "huge name"); |
32f89713 NH |
1748 | return; |
1749 | } | |
3074b9d1 | 1750 | |
1751 | if (idnsCachedLookup(name, callback, data)) | |
1752 | return; | |
1753 | ||
907a7a05 | 1754 | idns_query *q = new idns_query; |
049441d9 | 1755 | q->query_id = idnsQueryID(); |
71952967 | 1756 | |
32f89713 | 1757 | int nd = 0; |
b56b37cf | 1758 | for (size_t i = 0; i < nameLength; ++i) |
68836b58 | 1759 | if (name[i] == '.') |
95dc7ff4 | 1760 | ++nd; |
68836b58 | 1761 | |
32f89713 | 1762 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1763 | q->do_searchpath = 1; |
1764 | } else { | |
1765 | q->do_searchpath = 0; | |
1766 | } | |
1767 | ||
1768 | strcpy(q->orig, name); | |
1769 | strcpy(q->name, q->orig); | |
1770 | ||
1771 | if (q->do_searchpath && nd < ndots) { | |
1772 | q->domain = 0; | |
1773 | strcat(q->name, "."); | |
1774 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1775 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1776 | } |
1777 | ||
049441d9 HN |
1778 | // see EDNS notes at top of file why this sends 0 |
1779 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1780 | |
2041330b | 1781 | if (q->sz < 0) { |
1782 | /* problem with query data -- query not sent */ | |
fd9c47d1 | 1783 | idnsCallbackOnEarlyError(callback, data, "rfc3596BuildAQuery error"); |
907a7a05 | 1784 | delete q; |
2041330b | 1785 | return; |
1786 | } | |
1787 | ||
26ac0430 | 1788 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1789 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1790 | |
a079e38b | 1791 | idnsCheckMDNS(q); |
33ab4aaf | 1792 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1793 | |
1794 | if (Ip::EnableIpv6) | |
1795 | idnsSendSlaveAAAAQuery(q); | |
7b724b86 | 1796 | } |
8db71107 | 1797 | |
1798 | void | |
b7ac5457 | 1799 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1800 | { |
cc192b50 | 1801 | char ip[MAX_IPSTRLEN]; |
1802 | ||
4dd643d5 | 1803 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1804 | |
907a7a05 | 1805 | idns_query *q = new idns_query; |
049441d9 | 1806 | q->query_id = idnsQueryID(); |
71952967 | 1807 | |
4dd643d5 | 1808 | if (addr.isIPv6()) { |
cc192b50 | 1809 | struct in6_addr addr6; |
4dd643d5 | 1810 | addr.getInAddr(addr6); |
546ae352 | 1811 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1812 | } else { |
cc192b50 | 1813 | struct in_addr addr4; |
4dd643d5 | 1814 | addr.getInAddr(addr4); |
e210930b | 1815 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1816 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1817 | } |
1818 | ||
26ac0430 | 1819 | if (q->sz < 0) { |
2041330b | 1820 | /* problem with query data -- query not sent */ |
fd9c47d1 | 1821 | idnsCallbackOnEarlyError(callback, data, "rfc3596BuildPTRQuery error"); |
907a7a05 | 1822 | delete q; |
2041330b | 1823 | return; |
1824 | } | |
1825 | ||
37f3da43 | 1826 | if (idnsCachedLookup(q->query.name, callback, data)) { |
907a7a05 | 1827 | delete q; |
26ac0430 | 1828 | return; |
37f3da43 | 1829 | } |
1830 | ||
26ac0430 | 1831 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1832 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1833 | |
bce61b00 | 1834 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1835 | idnsStartQuery(q, callback, data); |
8db71107 | 1836 | } |
eb824054 | 1837 | |
59ad6d31 | 1838 | #if SQUID_SNMP |
3c573763 | 1839 | /* |
1840 | * The function to return the DNS via SNMP | |
1841 | */ | |
1842 | variable_list * | |
f64091a7 | 1843 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1844 | { |
b56b37cf | 1845 | int n = 0; |
3c573763 | 1846 | variable_list *Answer = NULL; |
6a644e75 AJ |
1847 | MemBuf tmp; |
1848 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1849 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1850 | |
3c573763 | 1851 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1852 | |
3c573763 | 1853 | case DNS_REQ: |
62e76326 | 1854 | |
b56b37cf AJ |
1855 | for (const auto &server : nameservers) |
1856 | n += server.nqueries; | |
62e76326 | 1857 | |
1858 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1859 | n, | |
1860 | SMI_COUNTER32); | |
1861 | ||
1862 | break; | |
1863 | ||
3c573763 | 1864 | case DNS_REP: |
b56b37cf AJ |
1865 | for (const auto &server : nameservers) |
1866 | n += server.nreplies; | |
62e76326 | 1867 | |
1868 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1869 | n, | |
1870 | SMI_COUNTER32); | |
1871 | ||
1872 | break; | |
1873 | ||
3c573763 | 1874 | case DNS_SERVERS: |
62e76326 | 1875 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
b56b37cf | 1876 | nameservers.size(), |
62e76326 | 1877 | SMI_COUNTER32); |
1878 | ||
1879 | break; | |
1880 | ||
3c573763 | 1881 | default: |
62e76326 | 1882 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1883 | ||
1884 | break; | |
3c573763 | 1885 | } |
62e76326 | 1886 | |
3c573763 | 1887 | return Answer; |
1888 | } | |
62e76326 | 1889 | |
3c573763 | 1890 | #endif /*SQUID_SNMP */ |
f53969cc | 1891 |