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7b724b86 | 1 | /* |
5b74111a | 2 | * Copyright (C) 1996-2018 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 FC |
11 | #include "squid.h" |
12 | #include "base/InstanceId.h" | |
ee58de20 | 13 | #include "base/RunnersRegistry.h" |
602d9612 | 14 | #include "comm.h" |
55cbb02b | 15 | #include "comm/Connection.h" |
aed188fd | 16 | #include "comm/ConnOpener.h" |
d841c88d | 17 | #include "comm/Loops.h" |
7e66d5e2 | 18 | #include "comm/Read.h" |
d841c88d | 19 | #include "comm/Write.h" |
17852883 | 20 | #include "dlink.h" |
4a3b98d7 AJ |
21 | #include "dns/forward.h" |
22 | #include "dns/rfc3596.h" | |
cfd66529 | 23 | #include "event.h" |
c4ad1349 | 24 | #include "fd.h" |
2c471ba8 | 25 | #include "fde.h" |
055421ee | 26 | #include "ip/tools.h" |
0eb49b6d | 27 | #include "MemBuf.h" |
8822ebee | 28 | #include "mgr/Registration.h" |
4d5904f7 | 29 | #include "SquidConfig.h" |
582c2af2 FC |
30 | #include "SquidTime.h" |
31 | #include "Store.h" | |
8d03bdb4 | 32 | #include "tools.h" |
7176768b | 33 | #include "util.h" |
d295d770 | 34 | #include "wordlist.h" |
68836b58 | 35 | |
9c0a2256 FC |
36 | #if SQUID_SNMP |
37 | #include "snmp_core.h" | |
38 | #endif | |
39 | ||
68836b58 | 40 | #if HAVE_ARPA_NAMESER_H |
41 | #include <arpa/nameser.h> | |
42 | #endif | |
1a30fdf5 | 43 | #include <cerrno> |
011b1672 | 44 | #include <random> |
68836b58 | 45 | #if HAVE_RESOLV_H |
46 | #include <resolv.h> | |
47 | #endif | |
48 | ||
be266cb2 | 49 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
50 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
51 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
52 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 53 | #endif |
68836b58 | 54 | #ifndef _PATH_RESCONF |
55 | #define _PATH_RESCONF "/etc/resolv.conf" | |
56 | #endif | |
57 | #ifndef NS_DEFAULTPORT | |
58 | #define NS_DEFAULTPORT 53 | |
59 | #endif | |
60 | ||
61 | #ifndef NS_MAXDNAME | |
62 | #define NS_MAXDNAME 1025 | |
63 | #endif | |
64 | ||
65 | #ifndef MAXDNSRCH | |
66 | #define MAXDNSRCH 6 | |
7b724b86 | 67 | #endif |
68836b58 | 68 | |
69 | /* The buffer size required to store the maximum allowed search path */ | |
70 | #ifndef RESOLV_BUFSZ | |
71 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 72 | #endif |
73 | ||
42b51993 | 74 | #define IDNS_MAX_TRIES 20 |
e210930b | 75 | #define MAX_RCODE 17 |
558be27a | 76 | #define MAX_ATTEMPT 3 |
77 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
78 | // NP: see http://www.iana.org/assignments/dns-parameters |
79 | static const char *Rcodes[] = { | |
24520b1b AJ |
80 | /* RFC 1035 */ |
81 | "Success", | |
82 | "Packet Format Error", | |
83 | "DNS Server Failure", | |
84 | "Non-Existent Domain", | |
85 | "Not Implemented", | |
86 | "Query Refused", | |
87 | /* RFC 2136 */ | |
88 | "Name Exists when it should not", | |
89 | "RR Set Exists when it should not", | |
90 | "RR Set that should exist does not", | |
91 | "Server Not Authoritative for zone", | |
92 | "Name not contained in zone", | |
93 | /* unassigned */ | |
94 | "","","","","", | |
95 | /* RFC 2671 */ | |
96 | "Bad OPT Version or TSIG Signature Failure" | |
97 | }; | |
558be27a | 98 | |
7b724b86 | 99 | typedef struct _ns ns; |
58a39dc9 | 100 | |
68836b58 | 101 | typedef struct _sp sp; |
102 | ||
907a7a05 AJ |
103 | class idns_query |
104 | { | |
105 | CBDATA_CLASS(idns_query); | |
106 | ||
107 | public: | |
1cb1b2d3 AJ |
108 | idns_query() { |
109 | callback = nullptr; | |
907a7a05 AJ |
110 | memset(&query, 0, sizeof(query)); |
111 | *buf = 0; | |
112 | *name = 0; | |
113 | *orig = 0; | |
114 | memset(&start_t, 0, sizeof(start_t)); | |
115 | memset(&sent_t, 0, sizeof(sent_t)); | |
116 | memset(&queue_t, 0, sizeof(queue_t)); | |
117 | } | |
118 | ||
119 | ~idns_query() { | |
120 | if (message) | |
121 | rfc1035MessageDestroy(&message); | |
122 | delete queue; | |
123 | delete slave; | |
124 | // master is just a back-reference | |
125 | cbdataReferenceDone(callback_data); | |
126 | } | |
d24ef4e9 | 127 | |
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]; | |
1cb1b2d3 AJ |
133 | ssize_t sz = 0; |
134 | unsigned short query_id = 0; ///< random query ID sent to server; changes with every query sent | |
135 | InstanceId<idns_query> xact_id; ///< identifies our "transaction", stays constant when query is retried | |
91dcbd43 | 136 | |
1cb1b2d3 AJ |
137 | int nsends = 0; |
138 | int need_vc = 0; | |
139 | bool permit_mdns = false; | |
140 | int pending = 0; | |
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; | |
1cb1b2d3 AJ |
147 | void *callback_data = nullptr; |
148 | int attempt = 0; | |
149 | int rcode = 0; | |
150 | idns_query *queue = nullptr; | |
151 | idns_query *slave = nullptr; // single linked list | |
152 | idns_query *master = nullptr; // single pointer to a shared master | |
153 | unsigned short domain = 0; | |
154 | unsigned short do_searchpath = 0; | |
155 | rfc1035_message *message = nullptr; | |
156 | int ancount = 0; | |
157 | const char *error = nullptr; | |
58a39dc9 | 158 | }; |
907a7a05 | 159 | |
91dcbd43 | 160 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 161 | |
907a7a05 AJ |
162 | CBDATA_CLASS_INIT(idns_query); |
163 | ||
164 | class nsvc | |
165 | { | |
166 | CBDATA_CLASS(nsvc); | |
167 | ||
168 | public: | |
1cb1b2d3 | 169 | explicit nsvc(int nsv) : ns(nsv), msg(new MemBuf()), queue(new MemBuf()) {} |
907a7a05 AJ |
170 | ~nsvc(); |
171 | ||
1cb1b2d3 | 172 | int ns = 0; |
00406b24 | 173 | Comm::ConnectionPointer conn; |
1cb1b2d3 AJ |
174 | unsigned short msglen = 0; |
175 | int read_msglen = 0; | |
176 | MemBuf *msg = nullptr; | |
177 | MemBuf *queue = nullptr; | |
178 | bool busy = true; | |
d24ef4e9 | 179 | }; |
180 | ||
907a7a05 AJ |
181 | CBDATA_CLASS_INIT(nsvc); |
182 | ||
26ac0430 | 183 | struct _ns { |
b7ac5457 | 184 | Ip::Address S; |
7b724b86 | 185 | int nqueries; |
186 | int nreplies; | |
e210930b AJ |
187 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
188 | int last_seen_edns; | |
189 | #endif | |
a079e38b | 190 | bool mDNSResolver; |
d24ef4e9 | 191 | nsvc *vc; |
7b724b86 | 192 | }; |
58a39dc9 | 193 | |
ee58de20 AJ |
194 | namespace Dns |
195 | { | |
196 | ||
197 | /// manage DNS internal component | |
198 | class ConfigRr : public RegisteredRunner | |
199 | { | |
200 | public: | |
201 | /* RegisteredRunner API */ | |
202 | virtual void startReconfigure() override; | |
203 | virtual void endingShutdown() override; | |
204 | }; | |
205 | ||
206 | RunnerRegistrationEntry(ConfigRr); | |
207 | ||
208 | } // namespace Dns | |
209 | ||
26ac0430 | 210 | struct _sp { |
68836b58 | 211 | char domain[NS_MAXDNAME]; |
212 | int queries; | |
213 | }; | |
214 | ||
7b724b86 | 215 | static ns *nameservers = NULL; |
68836b58 | 216 | static sp *searchpath = NULL; |
7b724b86 | 217 | static int nns = 0; |
218 | static int nns_alloc = 0; | |
51aee437 | 219 | static int nns_mdns_count = 0; |
68836b58 | 220 | static int npc = 0; |
221 | static int npc_alloc = 0; | |
222 | static int ndots = 1; | |
7b724b86 | 223 | static dlink_list lru_list; |
7cfc1c9a | 224 | static int event_queued = 0; |
3074b9d1 | 225 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 226 | |
e210930b AJ |
227 | /* |
228 | * Notes on EDNS: | |
229 | * | |
230 | * IPv4: | |
231 | * EDNS as specified may be sent as an additional record for any request. | |
232 | * early testing has revealed that it works on common devices, but cannot | |
233 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
234 | * | |
235 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
236 | * | |
237 | * Squid design: | |
238 | * Squid is optimized to generate one packet and re-send it to all NS | |
239 | * due to this we cannot customize the EDNS size per NS. | |
240 | * | |
241 | * As such we take the configuration option value as fixed. | |
242 | * | |
243 | * FUTURE TODO: | |
244 | * This may not be worth doing, but if/when additional-records are parsed | |
245 | * we will be able to recover the OPT value specific to any one NS and | |
246 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
247 | * size our active NS are capable. | |
248 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
249 | * Responses from the configured NS may cause this to be raised or turned off. | |
250 | */ | |
251 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
252 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
253 | #endif | |
254 | ||
7b724b86 | 255 | static OBJH idnsStats; |
256 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 257 | static void idnsAddMDNSNameservers(); |
68836b58 | 258 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 259 | static void idnsFreeNameservers(void); |
68836b58 | 260 | static void idnsFreeSearchpath(void); |
a079e38b | 261 | static bool idnsParseNameservers(void); |
a079e38b | 262 | static bool idnsParseResolvConf(void); |
be266cb2 | 263 | #if _SQUID_WINDOWS_ |
a079e38b | 264 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 265 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 266 | #endif |
33ab4aaf | 267 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 268 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 269 | static IOCB idnsReadVCHeader; |
e0d28505 | 270 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 271 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
272 | static IOCB idnsReadVC; |
273 | static IOCB idnsSentQueryVC; | |
62e76326 | 274 | |
b7ac5457 | 275 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 276 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 277 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 278 | static PF idnsRead; |
7cfc1c9a | 279 | static EVH idnsCheckQueue; |
efd900cb | 280 | static void idnsTickleQueue(void); |
558be27a | 281 | static void idnsRcodeCount(int, int); |
575d05c4 | 282 | static CLCB idnsVCClosed; |
91dcbd43 | 283 | static unsigned short idnsQueryID(void); |
049441d9 | 284 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
fd9c47d1 | 285 | static void idnsCallbackOnEarlyError(IDNSCB *callback, void *cbdata, const char *error); |
7b724b86 | 286 | |
a079e38b AJ |
287 | static void |
288 | idnsCheckMDNS(idns_query *q) | |
289 | { | |
bce61b00 AJ |
290 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
291 | return; | |
292 | ||
a079e38b AJ |
293 | size_t slen = strlen(q->name); |
294 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
295 | q->permit_mdns = true; | |
296 | } | |
297 | } | |
298 | ||
299 | static void | |
300 | idnsAddMDNSNameservers() | |
301 | { | |
51aee437 | 302 | nns_mdns_count=0; |
a079e38b | 303 | |
bce61b00 AJ |
304 | // mDNS is disabled |
305 | if (!Config.onoff.dns_mdns) | |
306 | return; | |
307 | ||
a079e38b | 308 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
309 | if (Ip::EnableIpv6) { |
310 | idnsAddNameserver("FF02::FB"); | |
311 | nameservers[nns-1].S.port(5353); | |
312 | nameservers[nns-1].mDNSResolver = true; | |
313 | ++nns_mdns_count; | |
314 | } | |
a079e38b AJ |
315 | |
316 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 317 | nameservers[nns-1].S.port(5353); |
a079e38b | 318 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
319 | |
320 | ++nns_mdns_count; | |
a079e38b AJ |
321 | } |
322 | ||
7b724b86 | 323 | static void |
324 | idnsAddNameserver(const char *buf) | |
325 | { | |
b7ac5457 | 326 | Ip::Address A; |
62e76326 | 327 | |
cc192b50 | 328 | if (!(A = buf)) { |
fa84c01d | 329 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 330 | return; |
d20b1cd0 | 331 | } |
62e76326 | 332 | |
4dd643d5 | 333 | if (A.isAnyAddr()) { |
fa84c01d | 334 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 335 | A.setLocalhost(); |
fa84c01d | 336 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 337 | } |
62e76326 | 338 | |
4dd643d5 | 339 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
340 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
341 | return; | |
5c5a349d | 342 | } |
62e76326 | 343 | |
7b724b86 | 344 | if (nns == nns_alloc) { |
62e76326 | 345 | int oldalloc = nns_alloc; |
346 | ns *oldptr = nameservers; | |
347 | ||
348 | if (nns_alloc == 0) | |
349 | nns_alloc = 2; | |
350 | else | |
351 | nns_alloc <<= 1; | |
352 | ||
353 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
354 | ||
355 | if (oldptr && oldalloc) | |
41d00cd3 | 356 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 357 | |
358 | if (oldptr) | |
359 | safe_free(oldptr); | |
7b724b86 | 360 | } |
62e76326 | 361 | |
7b724b86 | 362 | assert(nns < nns_alloc); |
4dd643d5 | 363 | A.port(NS_DEFAULTPORT); |
cc192b50 | 364 | nameservers[nns].S = A; |
e210930b AJ |
365 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
366 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
367 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
368 | #endif | |
cc192b50 | 369 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 370 | ++nns; |
7b724b86 | 371 | } |
372 | ||
68836b58 | 373 | static void |
374 | idnsAddPathComponent(const char *buf) | |
375 | { | |
376 | if (npc == npc_alloc) { | |
377 | int oldalloc = npc_alloc; | |
378 | sp *oldptr = searchpath; | |
379 | ||
380 | if (0 == npc_alloc) | |
381 | npc_alloc = 2; | |
382 | else | |
383 | npc_alloc <<= 1; | |
384 | ||
385 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
386 | ||
387 | if (oldptr && oldalloc) | |
41d00cd3 | 388 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 389 | |
390 | if (oldptr) | |
391 | safe_free(oldptr); | |
392 | } | |
393 | ||
394 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
395 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
396 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 397 | Tolower(searchpath[npc].domain); |
bf8fe701 | 398 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 399 | ++npc; |
68836b58 | 400 | } |
401 | ||
7b724b86 | 402 | static void |
403 | idnsFreeNameservers(void) | |
404 | { | |
405 | safe_free(nameservers); | |
406 | nns = nns_alloc = 0; | |
407 | } | |
408 | ||
68836b58 | 409 | static void |
410 | idnsFreeSearchpath(void) | |
411 | { | |
412 | safe_free(searchpath); | |
413 | npc = npc_alloc = 0; | |
414 | } | |
415 | ||
a079e38b | 416 | static bool |
efd900cb | 417 | idnsParseNameservers(void) |
418 | { | |
a079e38b | 419 | bool result = false; |
5a1098fb AJ |
420 | for (auto &i : Config.dns.nameservers) { |
421 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << i << " from squid.conf"); | |
422 | idnsAddNameserver(i.c_str()); | |
a079e38b | 423 | result = true; |
efd900cb | 424 | } |
a079e38b | 425 | return result; |
efd900cb | 426 | } |
427 | ||
a079e38b | 428 | static bool |
7b724b86 | 429 | idnsParseResolvConf(void) |
430 | { | |
a079e38b | 431 | bool result = false; |
a396d1f8 | 432 | #if !_SQUID_WINDOWS_ |
aa0ca030 | 433 | FILE *fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 434 | |
b69e9ffa AJ |
435 | if (!fp) { |
436 | int xerrno = errno; | |
437 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerr(xerrno)); | |
a079e38b | 438 | return false; |
7b724b86 | 439 | } |
62e76326 | 440 | |
aa0ca030 AJ |
441 | char buf[RESOLV_BUFSZ]; |
442 | const char *t = NULL; | |
68836b58 | 443 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 444 | t = strtok(buf, w_space); |
445 | ||
68836b58 | 446 | if (NULL == t) { |
62e76326 | 447 | continue; |
a37d6070 | 448 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 449 | t = strtok(NULL, w_space); |
62e76326 | 450 | |
68836b58 | 451 | if (NULL == t) |
452 | continue; | |
62e76326 | 453 | |
e0236918 | 454 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 455 | |
68836b58 | 456 | idnsAddNameserver(t); |
a079e38b | 457 | result = true; |
a37d6070 | 458 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
459 | idnsFreeSearchpath(); |
460 | t = strtok(NULL, w_space); | |
a083e75a | 461 | |
26ac0430 AJ |
462 | if (NULL == t) |
463 | continue; | |
a083e75a | 464 | |
e0236918 | 465 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 466 | |
26ac0430 | 467 | idnsAddPathComponent(t); |
a37d6070 | 468 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 469 | idnsFreeSearchpath(); |
68836b58 | 470 | while (NULL != t) { |
471 | t = strtok(NULL, w_space); | |
472 | ||
473 | if (NULL == t) | |
474 | continue; | |
475 | ||
e0236918 | 476 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 477 | |
478 | idnsAddPathComponent(t); | |
479 | } | |
a37d6070 | 480 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 481 | while (NULL != t) { |
482 | t = strtok(NULL, w_space); | |
62e76326 | 483 | |
68836b58 | 484 | if (NULL == t) |
485 | continue; | |
62e76326 | 486 | |
2c2da7d3 | 487 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 488 | ndots = atoi(t + 6); |
489 | ||
490 | if (ndots < 1) | |
491 | ndots = 1; | |
492 | ||
e0236918 | 493 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 494 | } |
495 | } | |
496 | } | |
7b724b86 | 497 | } |
a083e75a | 498 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
499 | t = strchr(t, '.'); |
500 | if (t) | |
501 | idnsAddPathComponent(t+1); | |
a083e75a | 502 | } |
62e76326 | 503 | |
7b724b86 | 504 | fclose(fp); |
aa0ca030 | 505 | #endif |
a079e38b | 506 | return result; |
7b724b86 | 507 | } |
508 | ||
be266cb2 | 509 | #if _SQUID_WINDOWS_ |
6b610e34 | 510 | static void |
d02b72b4 | 511 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 512 | { |
a16cb11f | 513 | char *t; |
6b610e34 | 514 | char *token; |
515 | HKEY hndKey; | |
516 | ||
0dde2160 | 517 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 518 | DWORD Type = 0; |
519 | DWORD Size = 0; | |
520 | LONG Result; | |
04f7fd38 | 521 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
522 | |
523 | if (Result == ERROR_SUCCESS && Size) { | |
524 | t = (char *) xmalloc(Size); | |
0dde2160 | 525 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 526 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
527 | idnsAddPathComponent(t); |
528 | xfree(t); | |
529 | } | |
04f7fd38 | 530 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 531 | |
532 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 533 | t = (char *) xmalloc(Size); |
04f7fd38 | 534 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 535 | token = strtok(t, Separator); |
6b610e34 | 536 | |
537 | while (token) { | |
538 | idnsAddPathComponent(token); | |
e0236918 | 539 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 540 | token = strtok(NULL, Separator); |
541 | } | |
26ac0430 | 542 | xfree(t); |
6b610e34 | 543 | } |
544 | ||
545 | RegCloseKey(hndKey); | |
546 | } | |
a6cae565 | 547 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
548 | t = strchr(t, '.'); |
549 | if (t) | |
550 | idnsAddPathComponent(t + 1); | |
a16cb11f | 551 | } |
6b610e34 | 552 | } |
553 | ||
a079e38b | 554 | static bool |
0e6d05ef | 555 | idnsParseWIN32Registry(void) |
556 | { | |
a16cb11f | 557 | char *t; |
0e6d05ef | 558 | char *token; |
559 | HKEY hndKey, hndKey2; | |
a079e38b | 560 | bool result = false; |
0e6d05ef | 561 | |
0e6d05ef | 562 | switch (WIN32_OS_version) { |
62e76326 | 563 | |
0e6d05ef | 564 | case _WIN_OS_WINNT: |
62e76326 | 565 | /* get nameservers from the Windows NT registry */ |
566 | ||
04f7fd38 | 567 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 568 | DWORD Type = 0; |
569 | DWORD Size = 0; | |
570 | LONG Result; | |
04f7fd38 | 571 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 572 | |
573 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 574 | t = (char *) xmalloc(Size); |
0dde2160 | 575 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 576 | token = strtok(t, ", "); |
62e76326 | 577 | |
578 | while (token) { | |
579 | idnsAddNameserver(token); | |
a079e38b | 580 | result = true; |
e0236918 | 581 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 582 | token = strtok(NULL, ","); |
62e76326 | 583 | } |
26ac0430 | 584 | xfree(t); |
62e76326 | 585 | } |
586 | ||
0dde2160 | 587 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 588 | |
589 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 590 | t = (char *) xmalloc(Size); |
a6cae565 | 591 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 592 | token = strtok(t, ", "); |
62e76326 | 593 | |
594 | while (token) { | |
e0236918 | 595 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 596 | idnsAddNameserver(token); |
a079e38b | 597 | result = true; |
62e76326 | 598 | token = strtok(NULL, ", "); |
599 | } | |
26ac0430 | 600 | xfree(t); |
62e76326 | 601 | } |
602 | ||
603 | RegCloseKey(hndKey); | |
604 | } | |
605 | ||
6b610e34 | 606 | idnsParseWIN32SearchList(" "); |
607 | ||
62e76326 | 608 | break; |
609 | ||
0e6d05ef | 610 | case _WIN_OS_WIN2K: |
62e76326 | 611 | |
b671cc68 | 612 | case _WIN_OS_WINXP: |
62e76326 | 613 | |
6b1846cf | 614 | case _WIN_OS_WINNET: |
28170269 | 615 | |
616 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
617 | |
618 | case _WIN_OS_WIN7: | |
62e76326 | 619 | /* get nameservers from the Windows 2000 registry */ |
620 | /* search all interfaces for DNS server addresses */ | |
621 | ||
04f7fd38 | 622 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 623 | int i; |
04f7fd38 AJ |
624 | DWORD MaxSubkeyLen, InterfacesCount; |
625 | char *keyname; | |
626 | FILETIME ftLastWriteTime; | |
627 | ||
628 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
629 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 630 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
631 | DWORD j; |
632 | j = MaxSubkeyLen; | |
633 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
634 | char *newkeyname; | |
635 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
636 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
637 | strcat(newkeyname, "\\"); | |
638 | strcat(newkeyname, keyname); | |
639 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
640 | DWORD Type = 0; | |
641 | DWORD Size = 0; | |
642 | LONG Result; | |
643 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
644 | if (Result == ERROR_SUCCESS && Size) { | |
645 | t = (char *) xmalloc(Size); | |
646 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
647 | token = strtok(t, ", "); | |
648 | while (token) { | |
e0236918 | 649 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 650 | idnsAddNameserver(token); |
a079e38b | 651 | result = true; |
04f7fd38 AJ |
652 | token = strtok(NULL, ", "); |
653 | } | |
654 | xfree(t); | |
655 | } | |
656 | ||
657 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
658 | if (Result == ERROR_SUCCESS && Size) { | |
659 | t = (char *) xmalloc(Size); | |
660 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
661 | token = strtok(t, ", "); | |
662 | while (token) { | |
e0236918 | 663 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 664 | idnsAddNameserver(token); |
a079e38b | 665 | result = true; |
04f7fd38 AJ |
666 | token = strtok(NULL, ", "); |
667 | } | |
668 | ||
669 | xfree(t); | |
62e76326 | 670 | } |
62e76326 | 671 | |
0dde2160 | 672 | RegCloseKey(hndKey2); |
62e76326 | 673 | } |
674 | ||
04f7fd38 | 675 | xfree(newkeyname); |
62e76326 | 676 | } |
677 | } | |
0dde2160 | 678 | |
04f7fd38 | 679 | xfree(keyname); |
62e76326 | 680 | } |
681 | ||
682 | RegCloseKey(hndKey); | |
683 | } | |
684 | ||
6b610e34 | 685 | idnsParseWIN32SearchList(", "); |
686 | ||
62e76326 | 687 | break; |
688 | ||
0e6d05ef | 689 | case _WIN_OS_WIN95: |
62e76326 | 690 | |
0e6d05ef | 691 | case _WIN_OS_WIN98: |
62e76326 | 692 | |
be20dac7 | 693 | case _WIN_OS_WINME: |
62e76326 | 694 | /* get nameservers from the Windows 9X registry */ |
695 | ||
04f7fd38 | 696 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 697 | DWORD Type = 0; |
698 | DWORD Size = 0; | |
699 | LONG Result; | |
04f7fd38 | 700 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 701 | |
702 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 703 | t = (char *) xmalloc(Size); |
a6cae565 | 704 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 705 | token = strtok(t, ", "); |
62e76326 | 706 | |
707 | while (token) { | |
e0236918 | 708 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 709 | idnsAddNameserver(token); |
a079e38b | 710 | result = true; |
62e76326 | 711 | token = strtok(NULL, ", "); |
712 | } | |
26ac0430 | 713 | xfree(t); |
62e76326 | 714 | } |
715 | ||
716 | RegCloseKey(hndKey); | |
717 | } | |
718 | ||
719 | break; | |
720 | ||
0e6d05ef | 721 | default: |
e0236918 | 722 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 723 | } |
a079e38b AJ |
724 | |
725 | return result; | |
0e6d05ef | 726 | } |
62e76326 | 727 | |
0e6d05ef | 728 | #endif |
729 | ||
7b724b86 | 730 | static void |
731 | idnsStats(StoreEntry * sentry) | |
732 | { | |
a16b4aa0 | 733 | dlink_node *n; |
734 | idns_query *q; | |
7cfc1c9a | 735 | int i; |
558be27a | 736 | int j; |
cc192b50 | 737 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 738 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 739 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 740 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
741 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
742 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 743 | |
a16b4aa0 | 744 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 745 | q = (idns_query *)n->data; |
bce61b00 | 746 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 747 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 748 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
749 | tvSubDsec(q->sent_t, current_time), |
750 | (q->permit_mdns? 'M':' '), | |
751 | q->name); | |
7cfc1c9a | 752 | } |
62e76326 | 753 | |
e210930b | 754 | if (Config.dns.packet_max > 0) |
bce61b00 | 755 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 756 | else |
bce61b00 | 757 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 758 | |
7cfc1c9a | 759 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
760 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
761 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 762 | |
95dc7ff4 | 763 | for (i = 0; i < nns; ++i) { |
a079e38b | 764 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 765 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 766 | nameservers[i].nqueries, |
a079e38b AJ |
767 | nameservers[i].nreplies, |
768 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 769 | } |
62e76326 | 770 | |
558be27a | 771 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
772 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 773 | |
95dc7ff4 | 774 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 775 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
776 | ||
e210930b | 777 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 778 | |
95dc7ff4 | 779 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
780 | if (j > 10 && j < 16) |
781 | continue; // unassigned by IANA. | |
782 | ||
62e76326 | 783 | storeAppendPrintf(sentry, "%5d", j); |
784 | ||
95dc7ff4 | 785 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 786 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
787 | ||
e210930b | 788 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 789 | } |
6b610e34 | 790 | |
791 | if (npc) { | |
792 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
793 | ||
95dc7ff4 | 794 | for (i=0; i < npc; ++i) |
6b610e34 | 795 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
796 | ||
797 | storeAppendPrintf(sentry, "\n"); | |
798 | } | |
7b724b86 | 799 | } |
800 | ||
efd900cb | 801 | static void |
802 | idnsTickleQueue(void) | |
803 | { | |
804 | if (event_queued) | |
62e76326 | 805 | return; |
806 | ||
efd900cb | 807 | if (NULL == lru_list.tail) |
62e76326 | 808 | return; |
809 | ||
fd0f51c4 CT |
810 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
811 | ||
812 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 813 | |
efd900cb | 814 | event_queued = 1; |
815 | } | |
816 | ||
d24ef4e9 | 817 | static void |
ced8def3 | 818 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag flag, int, void *data) |
d24ef4e9 | 819 | { |
820 | nsvc * vc = (nsvc *)data; | |
821 | ||
c8407295 | 822 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 823 | return; |
af6a12ee | 824 | |
e0d28505 AJ |
825 | // XXX: irrelevant now that we have conn pointer? |
826 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 827 | return; |
d24ef4e9 | 828 | |
c8407295 | 829 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 830 | conn->close(); |
d24ef4e9 | 831 | return; |
832 | } | |
833 | ||
834 | vc->busy = 0; | |
835 | idnsDoSendQueryVC(vc); | |
836 | } | |
837 | ||
838 | static void | |
839 | idnsDoSendQueryVC(nsvc *vc) | |
840 | { | |
841 | if (vc->busy) | |
842 | return; | |
843 | ||
032785bf | 844 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 845 | return; |
846 | ||
8401d6fc AR |
847 | // if retrying after a TC UDP response, our close handler cb may be pending |
848 | if (fd_table[vc->conn->fd].closing()) | |
849 | return; | |
850 | ||
032785bf | 851 | MemBuf *mb = vc->queue; |
d24ef4e9 | 852 | |
032785bf | 853 | vc->queue = new MemBuf; |
d24ef4e9 | 854 | |
855 | vc->busy = 1; | |
856 | ||
fd0f51c4 | 857 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
858 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
859 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 860 | AsyncCall::Pointer nil; |
d4b21972 | 861 | |
1b76e6c1 | 862 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 863 | |
ec41b64c AJ |
864 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
865 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 866 | Comm::Write(vc->conn, mb, call); |
032785bf | 867 | |
868 | delete mb; | |
d24ef4e9 | 869 | } |
870 | ||
871 | static void | |
ced8def3 | 872 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int, void *data) |
d24ef4e9 | 873 | { |
874 | nsvc * vc = (nsvc *)data; | |
875 | ||
c8407295 | 876 | if (status != Comm::OK || !conn) { |
dd3fb890 AR |
877 | char buf[MAX_IPSTRLEN] = ""; |
878 | if (vc->ns < nns) | |
4dd643d5 | 879 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 880 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 881 | return; |
882 | } | |
883 | ||
00406b24 | 884 | vc->conn = conn; |
cfd66529 AJ |
885 | |
886 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
887 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
888 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
889 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 890 | vc->busy = 0; |
891 | idnsDoSendQueryVC(vc); | |
892 | } | |
893 | ||
894 | static void | |
575d05c4 | 895 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 896 | { |
575d05c4 | 897 | nsvc * vc = (nsvc *)params.data; |
907a7a05 AJ |
898 | delete vc; |
899 | } | |
900 | ||
901 | nsvc::~nsvc() | |
902 | { | |
903 | delete queue; | |
904 | delete msg; | |
ee58de20 | 905 | if (ns < nns) // XXX: idnsShutdownAndFreeState may have freed nameservers[] |
907a7a05 | 906 | nameservers[ns].vc = NULL; |
d24ef4e9 | 907 | } |
908 | ||
909 | static void | |
9dca980d | 910 | idnsInitVC(int nsv) |
d24ef4e9 | 911 | { |
907a7a05 | 912 | nsvc *vc = new nsvc(nsv); |
9dca980d | 913 | assert(nsv < nns); |
00406b24 | 914 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d | 915 | nameservers[nsv].vc = vc; |
d24ef4e9 | 916 | |
00406b24 | 917 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 918 | |
4dd643d5 | 919 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 920 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 921 | else |
7fb5be3e | 922 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 923 | |
7fb5be3e | 924 | if (conn->remote.isIPv4()) |
4dd643d5 | 925 | conn->local.setIPv4(); |
f5ba22ff | 926 | |
cfd66529 | 927 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 928 | |
4accd6d8 | 929 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 930 | cs->setHost("DNS TCP Socket"); |
855150a4 | 931 | AsyncJob::Start(cs); |
d24ef4e9 | 932 | } |
933 | ||
934 | static void | |
9dca980d | 935 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 936 | { |
9dca980d AJ |
937 | assert(nsn < nns); |
938 | if (nameservers[nsn].vc == NULL) | |
939 | idnsInitVC(nsn); | |
d24ef4e9 | 940 | |
9dca980d | 941 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 942 | |
445962f3 HN |
943 | if (!vc) { |
944 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 945 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
946 | |
947 | return; | |
948 | } | |
949 | ||
2fe7eff9 | 950 | vc->queue->reset(); |
d24ef4e9 | 951 | |
952 | short head = htons(q->sz); | |
953 | ||
2fe7eff9 | 954 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 955 | |
2fe7eff9 | 956 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 957 | |
958 | idnsDoSendQueryVC(vc); | |
959 | } | |
960 | ||
7b724b86 | 961 | static void |
962 | idnsSendQuery(idns_query * q) | |
963 | { | |
ee58de20 AJ |
964 | // XXX: DNS sockets get closed during reconfigure produces a race between |
965 | // any already active connections (or ones received between closing DNS | |
966 | // sockets and server listening sockets) and the reconfigure completing | |
967 | // (Runner syncConfig() being run). Transactions which loose this race will | |
968 | // produce DNS timeouts (or whatever the caller set) as their queries never | |
969 | // get queued to be re-tried after the DNS socekts are re-opened. | |
970 | ||
4d6c8504 | 971 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 972 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 973 | return; |
0a69973e | 974 | } |
62e76326 | 975 | |
cc192b50 | 976 | if (nns <= 0) { |
e0236918 | 977 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 978 | return; |
979 | } | |
62e76326 | 980 | |
7b724b86 | 981 | assert(q->lru.next == NULL); |
62e76326 | 982 | |
7b724b86 | 983 | assert(q->lru.prev == NULL); |
62e76326 | 984 | |
4d6c8504 | 985 | int x = -1, y = -1; |
9dca980d | 986 | int nsn; |
4d6c8504 | 987 | |
213b6c90 | 988 | do { |
a079e38b AJ |
989 | // only use mDNS resolvers for mDNS compatible queries |
990 | if (!q->permit_mdns) | |
51aee437 | 991 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
992 | else |
993 | nsn = q->nsends % nns; | |
213b6c90 AJ |
994 | |
995 | if (q->need_vc) { | |
9dca980d | 996 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 997 | x = y = 0; |
213b6c90 | 998 | } else { |
4dd643d5 | 999 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 1000 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 1001 | else if (DnsSocketA >= 0) |
9dca980d | 1002 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 1003 | } |
b69e9ffa | 1004 | int xerrno = errno; |
62e76326 | 1005 | |
95dc7ff4 | 1006 | ++ q->nsends; |
62e76326 | 1007 | |
33ab4aaf | 1008 | q->sent_t = current_time; |
62e76326 | 1009 | |
4dd643d5 | 1010 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
b69e9ffa | 1011 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << DnsSocketB << ": sendto: " << xstrerr(xerrno)); |
4dd643d5 | 1012 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
b69e9ffa | 1013 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << DnsSocketA << ": sendto: " << xstrerr(xerrno)); |
4d6c8504 AJ |
1014 | |
1015 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 1016 | |
bd6a0c8f | 1017 | if (y > 0) { |
4d6c8504 | 1018 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 1019 | } |
bd6a0c8f | 1020 | if (x > 0) { |
4d6c8504 | 1021 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 1022 | } |
62e76326 | 1023 | |
9dca980d | 1024 | ++ nameservers[nsn].nqueries; |
c131f066 | 1025 | q->queue_t = current_time; |
7b724b86 | 1026 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 1027 | q->pending = 1; |
efd900cb | 1028 | idnsTickleQueue(); |
7b724b86 | 1029 | } |
1030 | ||
1031 | static int | |
b7ac5457 | 1032 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 1033 | { |
1034 | int i; | |
62e76326 | 1035 | |
95dc7ff4 | 1036 | for (i = 0; i < nns; ++i) { |
cc192b50 | 1037 | if (nameservers[i].S != from) |
62e76326 | 1038 | continue; |
1039 | ||
4dd643d5 | 1040 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 1041 | continue; |
1042 | ||
1043 | return i; | |
7b724b86 | 1044 | } |
62e76326 | 1045 | |
7cfc1c9a | 1046 | return -1; |
7b724b86 | 1047 | } |
1048 | ||
1049 | static idns_query * | |
1050 | idnsFindQuery(unsigned short id) | |
1051 | { | |
1052 | dlink_node *n; | |
1053 | idns_query *q; | |
62e76326 | 1054 | |
7b724b86 | 1055 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1056 | q = (idns_query*)n->data; |
1057 | ||
049441d9 | 1058 | if (q->query_id == id) |
62e76326 | 1059 | return q; |
7b724b86 | 1060 | } |
62e76326 | 1061 | |
7b724b86 | 1062 | return NULL; |
1063 | } | |
1064 | ||
108d67a0 | 1065 | static unsigned short |
011b1672 | 1066 | idnsQueryID() |
108d67a0 | 1067 | { |
011b1672 AJ |
1068 | // NP: apparently ranlux are faster, but not quite as "proven" |
1069 | static std::mt19937 mt(static_cast<uint32_t>(getCurrentTime() & 0xFFFFFFFF)); | |
1070 | unsigned short id = mt() & 0xFFFF; | |
108d67a0 | 1071 | unsigned short first_id = id; |
1072 | ||
011b1672 | 1073 | // ensure temporal uniqueness by looking for an existing use |
26ac0430 | 1074 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1075 | ++id; |
108d67a0 | 1076 | |
846c8960 | 1077 | if (id == first_id) { |
e0236918 | 1078 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1079 | break; |
846c8960 | 1080 | } |
108d67a0 | 1081 | } |
1082 | ||
846c8960 | 1083 | return id; |
108d67a0 | 1084 | } |
1085 | ||
fd9c47d1 AR |
1086 | /// \returns whether master or associated queries are still waiting for replies |
1087 | static bool | |
1088 | idnsStillPending(const idns_query *master) | |
3074b9d1 | 1089 | { |
fd9c47d1 AR |
1090 | assert(!master->master); // we were given the master transaction |
1091 | for (const idns_query *qi = master; qi; qi = qi->slave) { | |
1092 | if (qi->pending) | |
1093 | return true; | |
1094 | } | |
1095 | return false; | |
1096 | } | |
3074b9d1 | 1097 | |
fd9c47d1 AR |
1098 | static std::ostream & |
1099 | operator <<(std::ostream &os, const idns_query &answered) | |
1100 | { | |
1101 | if (answered.error) | |
1102 | os << "error \"" << answered.error << "\""; | |
1103 | else | |
1104 | os << answered.ancount << " records"; | |
1105 | return os; | |
1106 | } | |
33ab4aaf | 1107 | |
fd9c47d1 AR |
1108 | static void |
1109 | idnsCallbackOnEarlyError(IDNSCB *callback, void *cbdata, const char *error) | |
1110 | { | |
1111 | // A cbdataReferenceValid() check asserts on unlocked cbdata: Early errors, | |
1112 | // by definition, happen before we store/cbdataReference() cbdata. | |
1113 | debugs(78, 6, "\"" << error << "\" for " << cbdata); | |
1114 | callback(cbdata, nullptr, 0, "Internal error", true); // hide error details | |
1115 | } | |
33ab4aaf | 1116 | |
fd9c47d1 AR |
1117 | /// safely sends one set of DNS records (or an error) to the caller |
1118 | static bool | |
1119 | idnsCallbackOneWithAnswer(IDNSCB *callback, void *cbdata, const idns_query &answered, const bool lastAnswer) | |
1120 | { | |
1121 | if (!cbdataReferenceValid(cbdata)) | |
1122 | return false; | |
1123 | const rfc1035_rr *records = answered.message ? answered.message->answer : nullptr; | |
1124 | debugs(78, 6, (lastAnswer ? "last " : "") << answered << " for " << cbdata); | |
1125 | callback(cbdata, records, answered.ancount, answered.error, lastAnswer); | |
1126 | return true; | |
1127 | } | |
33ab4aaf | 1128 | |
fd9c47d1 AR |
1129 | static void |
1130 | idnsCallbackNewCallerWithOldAnswers(IDNSCB *callback, void *cbdata, const idns_query * const master) | |
1131 | { | |
1132 | const bool lastAnswer = false; | |
1133 | // iterate all queries to act on answered ones | |
1134 | for (auto query = master; query; query = query->slave) { | |
1135 | if (query->pending) | |
1136 | continue; // no answer yet | |
1137 | if (!idnsCallbackOneWithAnswer(callback, cbdata, *query, lastAnswer)) | |
1138 | break; // the caller disappeared | |
33ab4aaf | 1139 | } |
fd9c47d1 | 1140 | } |
33ab4aaf | 1141 | |
fd9c47d1 AR |
1142 | static void |
1143 | idnsCallbackAllCallersWithNewAnswer(const idns_query * const answered, const bool lastAnswer) | |
1144 | { | |
1145 | debugs(78, 8, (lastAnswer ? "last " : "") << *answered); | |
1146 | const auto master = answered->master ? answered->master : answered; | |
1147 | // iterate all queued lookup callers | |
1148 | for (auto looker = master; looker; looker = looker->queue) { | |
1149 | (void)idnsCallbackOneWithAnswer(looker->callback, looker->callback_data, | |
1150 | *answered, lastAnswer); | |
1151 | } | |
1152 | } | |
3074b9d1 | 1153 | |
fd9c47d1 AR |
1154 | static void |
1155 | idnsCallback(idns_query *q, const char *error) | |
1156 | { | |
1157 | if (error) | |
1158 | q->error = error; | |
907a7a05 | 1159 | |
fd9c47d1 | 1160 | auto master = q->master ? q->master : q; |
3074b9d1 | 1161 | |
fd9c47d1 AR |
1162 | const bool lastAnswer = !idnsStillPending(master); |
1163 | idnsCallbackAllCallersWithNewAnswer(q, lastAnswer); | |
3074b9d1 | 1164 | |
fd9c47d1 AR |
1165 | if (!lastAnswer) |
1166 | return; // wait for more answers | |
3074b9d1 | 1167 | |
fd9c47d1 AR |
1168 | if (master->hash.key) { |
1169 | hash_remove_link(idns_lookup_hash, &master->hash); | |
1170 | master->hash.key = nullptr; | |
3074b9d1 | 1171 | } |
33ab4aaf | 1172 | |
fd9c47d1 | 1173 | delete master; |
3074b9d1 | 1174 | } |
1175 | ||
7b724b86 | 1176 | static void |
ced8def3 | 1177 | idnsGrokReply(const char *buf, size_t sz, int /*from_ns*/) |
7b724b86 | 1178 | { |
ec7bade0 | 1179 | rfc1035_message *message = NULL; |
3074b9d1 | 1180 | |
907a7a05 | 1181 | int n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1182 | |
ec7bade0 | 1183 | if (message == NULL) { |
e0236918 | 1184 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1185 | return; |
7b724b86 | 1186 | } |
62e76326 | 1187 | |
91dcbd43 | 1188 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1189 | |
907a7a05 | 1190 | idns_query *q = idnsFindQuery(message->id); |
ec7bade0 | 1191 | |
7b724b86 | 1192 | if (q == NULL) { |
bf8fe701 | 1193 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1194 | rfc1035MessageDestroy(&message); |
62e76326 | 1195 | return; |
7b724b86 | 1196 | } |
62e76326 | 1197 | |
9e1f210d | 1198 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1199 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1200 | rfc1035MessageDestroy(&message); |
9e1f210d | 1201 | return; |
1202 | } | |
1203 | ||
e210930b AJ |
1204 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1205 | // TODO: actually gr the message right here. | |
f53969cc SM |
1206 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q |
1207 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1208 | // AND allows us to merge AN+AR sections from both responses (one day) | |
e210930b AJ |
1209 | |
1210 | if (q->edns_seen >= 0) { | |
1211 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1212 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1213 | // the altered NS was limiting the whole group. | |
1214 | max_shared_edns = q->edns_seen; | |
1215 | // may be limited by one of the others still | |
95dc7ff4 | 1216 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1217 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1218 | } else { | |
1219 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1220 | // maybe reduce the global limit downwards to accomodate this NS | |
1221 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1222 | } | |
1223 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1224 | max_shared_edns = -1; | |
1225 | } | |
1226 | #endif | |
1227 | ||
049441d9 HN |
1228 | dlinkDelete(&q->lru, &lru_list); |
1229 | q->pending = 0; | |
1230 | ||
d24ef4e9 | 1231 | if (message->tc) { |
bae9832d | 1232 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1233 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1234 | |
1235 | if (!q->need_vc) { | |
1236 | q->need_vc = 1; | |
5e263176 | 1237 | -- q->nsends; |
d24ef4e9 | 1238 | idnsSendQuery(q); |
91dcbd43 CT |
1239 | } else { |
1240 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1241 | // Return an error and cleanup; no point in trying TCP again. | |
1242 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1243 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1244 | } |
1245 | ||
1246 | return; | |
1247 | } | |
9e1f210d | 1248 | |
558be27a | 1249 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1250 | |
558be27a | 1251 | if (n < 0) { |
7ba8d0b8 | 1252 | q->rcode = -n; |
42687bb2 | 1253 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1254 | |
95dc7ff4 | 1255 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1256 | /* |
1257 | * RCODE 2 is "Server failure - The name server was | |
1258 | * unable to process this query due to a problem with | |
1259 | * the name server." | |
1260 | */ | |
cc192b50 | 1261 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1262 | rfc1035MessageDestroy(&message); | |
62e76326 | 1263 | idnsSendQuery(q); |
1264 | return; | |
1265 | } | |
68836b58 | 1266 | |
0e6432d0 HN |
1267 | // Do searchpath processing on the master A query only to keep |
1268 | // things simple. NXDOMAIN is authorative for the label, not | |
1269 | // the record type. | |
049441d9 | 1270 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1271 | assert(NULL == message->answer); |
1272 | strcpy(q->name, q->orig); | |
1273 | ||
cc192b50 | 1274 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1275 | ||
68836b58 | 1276 | if (q->domain < npc) { |
1277 | strcat(q->name, "."); | |
1278 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1279 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1280 | ++ q->domain; |
68836b58 | 1281 | } else { |
95dc7ff4 | 1282 | ++ q->attempt; |
68836b58 | 1283 | } |
1284 | ||
049441d9 | 1285 | rfc1035MessageDestroy(&message); |
cc192b50 | 1286 | |
33ab4aaf | 1287 | // cleanup slave AAAA query |
049441d9 HN |
1288 | while (idns_query *slave = q->slave) { |
1289 | dlinkDelete(&slave->lru, &lru_list); | |
1290 | q->slave = slave->slave; | |
907a7a05 AJ |
1291 | slave->slave = NULL; |
1292 | delete slave; | |
cc192b50 | 1293 | } |
c7ba545e | 1294 | |
049441d9 HN |
1295 | // Build new query |
1296 | q->query_id = idnsQueryID(); | |
1297 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1298 | // see EDNS notes at top of file why this sends 0 | |
1299 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1300 | if (q->sz < 0) { |
1301 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1302 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1303 | return; |
1304 | } | |
1305 | ||
33ab4aaf HN |
1306 | q->nsends = 0; |
1307 | ||
a079e38b | 1308 | idnsCheckMDNS(q); |
68836b58 | 1309 | idnsSendQuery(q); |
049441d9 HN |
1310 | if (Ip::EnableIpv6) |
1311 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1312 | return; |
1313 | } | |
558be27a | 1314 | } |
62e76326 | 1315 | |
049441d9 HN |
1316 | q->message = message; |
1317 | q->ancount = n; | |
cc192b50 | 1318 | |
33ab4aaf HN |
1319 | if (n >= 0) |
1320 | idnsCallback(q, NULL); | |
1321 | else | |
1322 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1323 | |
7b724b86 | 1324 | } |
1325 | ||
1326 | static void | |
ced8def3 | 1327 | idnsRead(int fd, void *) |
7b724b86 | 1328 | { |
d193a436 | 1329 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1330 | int len; |
42b51993 | 1331 | int max = INCOMING_DNS_MAX; |
d29b40de | 1332 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1333 | Ip::Address from; |
cc192b50 | 1334 | |
d7e7eaa7 | 1335 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1336 | |
bd6a0c8f HN |
1337 | // Always keep reading. This stops (or at least makes harder) several |
1338 | // attacks on the DNS client. | |
d841c88d | 1339 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1340 | |
cc192b50 | 1341 | /* BUG (UNRESOLVED) |
1342 | * two code lines after returning from comm_udprecvfrom() | |
1343 | * something overwrites the memory behind the from parameter. | |
1344 | * NO matter where in the stack declaration list above it is placed | |
1345 | * The cause of this is still unknown, however copying the data appears | |
1346 | * to allow it to be passed further without this erasure. | |
1347 | */ | |
b7ac5457 | 1348 | Ip::Address bugbypass; |
62e76326 | 1349 | |
5e263176 FC |
1350 | while (max) { |
1351 | --max; | |
cc192b50 | 1352 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1353 | |
cc192b50 | 1354 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1355 | |
1356 | if (len == 0) | |
1357 | break; | |
1358 | ||
1359 | if (len < 0) { | |
b69e9ffa AJ |
1360 | int xerrno = errno; |
1361 | if (ignoreErrno(xerrno)) | |
62e76326 | 1362 | break; |
1363 | ||
1191b93b | 1364 | #if _SQUID_LINUX_ |
62e76326 | 1365 | /* Some Linux systems seem to set the FD for reading and then |
1366 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1367 | * port unreachable message. */ | |
1368 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
b69e9ffa | 1369 | if (xerrno != ECONNREFUSED && xerrno != EHOSTUNREACH) |
7b724b86 | 1370 | #endif |
b69e9ffa | 1371 | debugs(50, DBG_IMPORTANT, MYNAME << "FD " << fd << " recvfrom: " << xstrerr(xerrno)); |
62e76326 | 1372 | |
1373 | break; | |
1374 | } | |
1375 | ||
055421ee | 1376 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1377 | |
62e76326 | 1378 | assert(N); |
aec55359 | 1379 | ++(*N); |
cc192b50 | 1380 | |
1381 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1382 | ||
1383 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1384 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1385 | |
9dca980d AJ |
1386 | if (nsn >= 0) { |
1387 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1388 | } |
1389 | ||
1390 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1391 | // but after the ++ above to keep statistics right. | |
1392 | if (!lru_list.head) | |
1393 | continue; // Don't process replies if there is no pending query. | |
1394 | ||
9dca980d | 1395 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1396 | static time_t last_warning = 0; |
1397 | ||
1398 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1399 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1400 | last_warning = squid_curtime; |
26ac0430 | 1401 | } else { |
e0236918 | 1402 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1403 | } |
1404 | continue; | |
62e76326 | 1405 | } |
1406 | ||
9dca980d | 1407 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1408 | } |
1409 | } | |
1410 | ||
7cfc1c9a | 1411 | static void |
ced8def3 | 1412 | idnsCheckQueue(void *) |
7cfc1c9a | 1413 | { |
1414 | dlink_node *n; | |
0c4fe9e4 | 1415 | dlink_node *p = NULL; |
7cfc1c9a | 1416 | idns_query *q; |
1417 | event_queued = 0; | |
62e76326 | 1418 | |
820ee9fa AJ |
1419 | if (0 == nns) |
1420 | /* name servers went away; reconfiguring or shutting down */ | |
1421 | return; | |
1422 | ||
0c4fe9e4 | 1423 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1424 | |
820ee9fa | 1425 | p = n->prev; |
733cedc0 | 1426 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1427 | |
820ee9fa | 1428 | /* Anything to process in the queue? */ |
fd0f51c4 | 1429 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1430 | break; |
62e76326 | 1431 | |
33ab4aaf | 1432 | /* Query timer still running? */ |
fd0f51c4 | 1433 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1434 | dlinkDelete(&q->lru, &lru_list); |
1435 | q->queue_t = current_time; | |
1436 | dlinkAdd(q, &q->lru, &lru_list); | |
1437 | continue; | |
1438 | } | |
62e76326 | 1439 | |
91dcbd43 CT |
1440 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1441 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1442 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1443 | |
1444 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1445 | q->pending = 0; |
62e76326 | 1446 | |
fd0f51c4 | 1447 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1448 | idnsSendQuery(q); |
1449 | } else { | |
91dcbd43 | 1450 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1451 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1452 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1453 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1454 | |
1455 | if (q->rcode != 0) | |
33ab4aaf | 1456 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1457 | else |
33ab4aaf | 1458 | idnsCallback(q, "Timeout"); |
62e76326 | 1459 | } |
7cfc1c9a | 1460 | } |
62e76326 | 1461 | |
efd900cb | 1462 | idnsTickleQueue(); |
7cfc1c9a | 1463 | } |
1464 | ||
d24ef4e9 | 1465 | static void |
ced8def3 | 1466 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1467 | { |
1468 | nsvc * vc = (nsvc *)data; | |
1469 | ||
c8407295 | 1470 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1471 | return; |
1472 | ||
c8407295 | 1473 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1474 | if (Comm::IsConnOpen(conn)) |
1475 | conn->close(); | |
d24ef4e9 | 1476 | return; |
1477 | } | |
1478 | ||
bd6a0c8f | 1479 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1480 | |
032785bf | 1481 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1482 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1483 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1484 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1485 | return; |
1486 | } | |
1487 | ||
dd3fb890 | 1488 | assert(vc->ns < nns); |
e0d28505 | 1489 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1490 | |
e210930b | 1491 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1492 | vc->msg->clean(); |
abd8f140 AJ |
1493 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1494 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1495 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1496 | } |
1497 | ||
1498 | static void | |
ced8def3 | 1499 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1500 | { |
1501 | nsvc * vc = (nsvc *)data; | |
1502 | ||
c8407295 | 1503 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1504 | return; |
1505 | ||
c8407295 | 1506 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1507 | if (Comm::IsConnOpen(conn)) |
1508 | conn->close(); | |
d24ef4e9 | 1509 | return; |
1510 | } | |
1511 | ||
1512 | vc->read_msglen += len; | |
1513 | ||
1514 | assert(vc->read_msglen <= 2); | |
1515 | ||
1516 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1517 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1518 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1519 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1520 | return; |
1521 | } | |
1522 | ||
1523 | vc->read_msglen = 0; | |
1524 | ||
1525 | vc->msglen = ntohs(vc->msglen); | |
1526 | ||
8185c30b SS |
1527 | if (!vc->msglen) { |
1528 | if (Comm::IsConnOpen(conn)) | |
1529 | conn->close(); | |
1530 | return; | |
1531 | } | |
1532 | ||
2fe7eff9 | 1533 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1534 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1535 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1536 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1537 | } |
1538 | ||
558be27a | 1539 | /* |
1540 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1541 | */ | |
1542 | static void | |
1543 | idnsRcodeCount(int rcode, int attempt) | |
1544 | { | |
1545 | if (rcode > 0) | |
62e76326 | 1546 | rcode = 0; |
558be27a | 1547 | else if (rcode < 0) |
62e76326 | 1548 | rcode = -rcode; |
1549 | ||
558be27a | 1550 | if (rcode < MAX_RCODE) |
62e76326 | 1551 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1552 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1553 | } |
1554 | ||
7b724b86 | 1555 | void |
4a3b98d7 | 1556 | Dns::Init(void) |
7b724b86 | 1557 | { |
1558 | static int init = 0; | |
62e76326 | 1559 | |
4d6c8504 | 1560 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1561 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1562 | |
4dd643d5 | 1563 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1564 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1565 | else |
049441d9 | 1566 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1567 | |
049441d9 | 1568 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1569 | addrV4.setIPv4(); |
7e07ced1 | 1570 | |
4dd643d5 | 1571 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1572 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1573 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1574 | IPPROTO_UDP, |
049441d9 | 1575 | addrV6, |
04f7fd38 | 1576 | COMM_NONBLOCKING, |
055421ee | 1577 | "DNS Socket IPv6"); |
7e07ced1 | 1578 | } |
4d6c8504 | 1579 | |
4dd643d5 | 1580 | if (addrV4.isIPv4()) { |
049441d9 | 1581 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1582 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1583 | IPPROTO_UDP, |
049441d9 | 1584 | addrV4, |
04f7fd38 | 1585 | COMM_NONBLOCKING, |
055421ee | 1586 | "DNS Socket IPv4"); |
7e07ced1 | 1587 | } |
62e76326 | 1588 | |
4d6c8504 | 1589 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1590 | fatal("Could not create a DNS socket"); |
1591 | ||
1592 | /* Ouch... we can't call functions using debug from a debug | |
1593 | * statement. Doing so messes up the internal Debug::level | |
1594 | */ | |
04f7fd38 | 1595 | if (DnsSocketB >= 0) { |
e91e2a72 | 1596 | comm_local_port(DnsSocketB); |
e0236918 | 1597 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1598 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1599 | } |
04f7fd38 | 1600 | if (DnsSocketA >= 0) { |
e91e2a72 | 1601 | comm_local_port(DnsSocketA); |
e0236918 | 1602 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1603 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1604 | } |
7b724b86 | 1605 | } |
62e76326 | 1606 | |
efd900cb | 1607 | assert(0 == nns); |
a079e38b AJ |
1608 | idnsAddMDNSNameservers(); |
1609 | bool nsFound = idnsParseNameservers(); | |
62e76326 | 1610 | |
a079e38b AJ |
1611 | if (!nsFound) |
1612 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1613 | |
be266cb2 | 1614 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1615 | if (!nsFound) |
1616 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1617 | #endif |
62e76326 | 1618 | |
a079e38b | 1619 | if (!nsFound) { |
e0236918 | 1620 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1621 | #if _SQUID_WINDOWS_ |
e0236918 | 1622 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1623 | #else |
e0236918 | 1624 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1625 | #endif |
29fe9bd5 | 1626 | |
e0236918 | 1627 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1628 | if (Ip::EnableIpv6) |
1629 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1630 | idnsAddNameserver("127.0.0.1"); |
1631 | } | |
62e76326 | 1632 | |
7b724b86 | 1633 | if (!init) { |
62e76326 | 1634 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1635 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1636 | ++init; |
7b724b86 | 1637 | } |
372fb44e | 1638 | |
e210930b AJ |
1639 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1640 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1641 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1642 | max_shared_edns = -1; // disable if we might receive random replies. | |
1643 | } | |
1644 | #endif | |
1645 | ||
4a3b98d7 | 1646 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
7b724b86 | 1647 | } |
1648 | ||
ee58de20 AJ |
1649 | static void |
1650 | idnsShutdownAndFreeState(const char *reason) | |
7b724b86 | 1651 | { |
4d6c8504 | 1652 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1653 | return; |
1654 | ||
ee58de20 AJ |
1655 | debugs(78, 2, reason << ": Closing DNS sockets"); |
1656 | ||
04f7fd38 | 1657 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1658 | comm_close(DnsSocketA); |
1659 | DnsSocketA = -1; | |
1660 | } | |
62e76326 | 1661 | |
055421ee | 1662 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1663 | comm_close(DnsSocketB); |
1664 | DnsSocketB = -1; | |
1665 | } | |
62e76326 | 1666 | |
95dc7ff4 | 1667 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1668 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1669 | if (Comm::IsConnOpen(vc->conn)) |
1670 | vc->conn->close(); | |
b26754c4 | 1671 | } |
1672 | } | |
1673 | ||
dd3fb890 | 1674 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1675 | idnsFreeNameservers(); |
68836b58 | 1676 | idnsFreeSearchpath(); |
7b724b86 | 1677 | } |
1678 | ||
ee58de20 AJ |
1679 | void |
1680 | Dns::ConfigRr::endingShutdown() | |
1681 | { | |
1682 | idnsShutdownAndFreeState("Shutdown"); | |
1683 | } | |
1684 | ||
1685 | void | |
1686 | Dns::ConfigRr::startReconfigure() | |
1687 | { | |
1688 | idnsShutdownAndFreeState("Reconfigure"); | |
1689 | } | |
1690 | ||
3074b9d1 | 1691 | static int |
1692 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1693 | { | |
3074b9d1 | 1694 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); |
1695 | ||
1696 | if (!old) | |
1697 | return 0; | |
1698 | ||
907a7a05 | 1699 | idns_query *q = new idns_query; |
049441d9 | 1700 | // no query_id on this instance. |
3074b9d1 | 1701 | |
1702 | q->callback = callback; | |
3074b9d1 | 1703 | q->callback_data = cbdataReference(data); |
1704 | ||
1705 | q->queue = old->queue; | |
3074b9d1 | 1706 | old->queue = q; |
1707 | ||
fd9c47d1 AR |
1708 | // This check must follow cbdataReference() above because our callback code |
1709 | // needs a locked cbdata to call cbdataReferenceValid(). | |
1710 | if (idnsStillPending(old)) | |
1711 | idnsCallbackNewCallerWithOldAnswers(callback, data, old); | |
1712 | // else: idns_lookup_hash is not a cache so no pending lookups means we are | |
1713 | // in a reentrant lookup and will be called back when dequeued. | |
1714 | ||
3074b9d1 | 1715 | return 1; |
1716 | } | |
1717 | ||
1718 | static void | |
33ab4aaf | 1719 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1720 | { |
33ab4aaf HN |
1721 | q->start_t = current_time; |
1722 | q->callback = callback; | |
1723 | q->callback_data = cbdataReference(data); | |
1724 | ||
049441d9 | 1725 | q->hash.key = q->orig; |
3074b9d1 | 1726 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1727 | |
1728 | idnsSendQuery(q); | |
3074b9d1 | 1729 | } |
1730 | ||
049441d9 HN |
1731 | static void |
1732 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1733 | { | |
907a7a05 | 1734 | idns_query *q = new idns_query; |
049441d9 HN |
1735 | memcpy(q->name, master->name, sizeof(q->name)); |
1736 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1737 | q->master = master; | |
1738 | q->query_id = idnsQueryID(); | |
1739 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
c7ba545e | 1740 | |
cafb131e | 1741 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1742 | ", id = 0x" << std::hex << q->query_id); |
1743 | if (!q->sz) { | |
907a7a05 | 1744 | delete q; |
049441d9 HN |
1745 | return; |
1746 | } | |
907a7a05 AJ |
1747 | |
1748 | q->start_t = master->start_t; | |
1749 | q->slave = master->slave; | |
1750 | ||
a079e38b | 1751 | idnsCheckMDNS(q); |
049441d9 HN |
1752 | master->slave = q; |
1753 | idnsSendQuery(q); | |
1754 | } | |
1755 | ||
7b724b86 | 1756 | void |
1757 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1758 | { | |
32f89713 NH |
1759 | size_t nameLength = strlen(name); |
1760 | ||
1761 | // Prevent buffer overflow on q->name | |
1762 | if (nameLength > NS_MAXDNAME) { | |
1763 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
fd9c47d1 | 1764 | idnsCallbackOnEarlyError(callback, data, "huge name"); |
32f89713 NH |
1765 | return; |
1766 | } | |
3074b9d1 | 1767 | |
1768 | if (idnsCachedLookup(name, callback, data)) | |
1769 | return; | |
1770 | ||
907a7a05 | 1771 | idns_query *q = new idns_query; |
049441d9 | 1772 | q->query_id = idnsQueryID(); |
71952967 | 1773 | |
32f89713 NH |
1774 | int nd = 0; |
1775 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1776 | if (name[i] == '.') |
95dc7ff4 | 1777 | ++nd; |
68836b58 | 1778 | |
32f89713 | 1779 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1780 | q->do_searchpath = 1; |
1781 | } else { | |
1782 | q->do_searchpath = 0; | |
1783 | } | |
1784 | ||
1785 | strcpy(q->orig, name); | |
1786 | strcpy(q->name, q->orig); | |
1787 | ||
1788 | if (q->do_searchpath && nd < ndots) { | |
1789 | q->domain = 0; | |
1790 | strcat(q->name, "."); | |
1791 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1792 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1793 | } |
1794 | ||
049441d9 HN |
1795 | // see EDNS notes at top of file why this sends 0 |
1796 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1797 | |
2041330b | 1798 | if (q->sz < 0) { |
1799 | /* problem with query data -- query not sent */ | |
fd9c47d1 | 1800 | idnsCallbackOnEarlyError(callback, data, "rfc3596BuildAQuery error"); |
907a7a05 | 1801 | delete q; |
2041330b | 1802 | return; |
1803 | } | |
1804 | ||
26ac0430 | 1805 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1806 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1807 | |
a079e38b | 1808 | idnsCheckMDNS(q); |
33ab4aaf | 1809 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1810 | |
1811 | if (Ip::EnableIpv6) | |
1812 | idnsSendSlaveAAAAQuery(q); | |
7b724b86 | 1813 | } |
8db71107 | 1814 | |
1815 | void | |
b7ac5457 | 1816 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1817 | { |
cc192b50 | 1818 | char ip[MAX_IPSTRLEN]; |
1819 | ||
4dd643d5 | 1820 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1821 | |
907a7a05 | 1822 | idns_query *q = new idns_query; |
049441d9 | 1823 | q->query_id = idnsQueryID(); |
71952967 | 1824 | |
4dd643d5 | 1825 | if (addr.isIPv6()) { |
cc192b50 | 1826 | struct in6_addr addr6; |
4dd643d5 | 1827 | addr.getInAddr(addr6); |
546ae352 | 1828 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1829 | } else { |
cc192b50 | 1830 | struct in_addr addr4; |
4dd643d5 | 1831 | addr.getInAddr(addr4); |
e210930b | 1832 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1833 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1834 | } |
1835 | ||
26ac0430 | 1836 | if (q->sz < 0) { |
2041330b | 1837 | /* problem with query data -- query not sent */ |
fd9c47d1 | 1838 | idnsCallbackOnEarlyError(callback, data, "rfc3596BuildPTRQuery error"); |
907a7a05 | 1839 | delete q; |
2041330b | 1840 | return; |
1841 | } | |
1842 | ||
37f3da43 | 1843 | if (idnsCachedLookup(q->query.name, callback, data)) { |
907a7a05 | 1844 | delete q; |
26ac0430 | 1845 | return; |
37f3da43 | 1846 | } |
1847 | ||
26ac0430 | 1848 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1849 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1850 | |
bce61b00 | 1851 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1852 | idnsStartQuery(q, callback, data); |
8db71107 | 1853 | } |
eb824054 | 1854 | |
59ad6d31 | 1855 | #if SQUID_SNMP |
3c573763 | 1856 | /* |
1857 | * The function to return the DNS via SNMP | |
1858 | */ | |
1859 | variable_list * | |
f64091a7 | 1860 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1861 | { |
1862 | int i, n = 0; | |
1863 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1864 | MemBuf tmp; |
1865 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1866 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1867 | |
3c573763 | 1868 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1869 | |
3c573763 | 1870 | case DNS_REQ: |
62e76326 | 1871 | |
95dc7ff4 | 1872 | for (i = 0; i < nns; ++i) |
62e76326 | 1873 | n += nameservers[i].nqueries; |
1874 | ||
1875 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1876 | n, | |
1877 | SMI_COUNTER32); | |
1878 | ||
1879 | break; | |
1880 | ||
3c573763 | 1881 | case DNS_REP: |
95dc7ff4 | 1882 | for (i = 0; i < nns; ++i) |
62e76326 | 1883 | n += nameservers[i].nreplies; |
1884 | ||
1885 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1886 | n, | |
1887 | SMI_COUNTER32); | |
1888 | ||
1889 | break; | |
1890 | ||
3c573763 | 1891 | case DNS_SERVERS: |
62e76326 | 1892 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1893 | nns, |
62e76326 | 1894 | SMI_COUNTER32); |
1895 | ||
1896 | break; | |
1897 | ||
3c573763 | 1898 | default: |
62e76326 | 1899 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1900 | ||
1901 | break; | |
3c573763 | 1902 | } |
62e76326 | 1903 | |
3c573763 | 1904 | return Answer; |
1905 | } | |
62e76326 | 1906 | |
3c573763 | 1907 | #endif /*SQUID_SNMP */ |
f53969cc | 1908 |