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Commit | Line | Data |
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7b724b86 | 1 | /* |
bbc27441 | 2 | * Copyright (C) 1996-2014 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 | ||
bbc27441 AJ |
9 | /* DEBUG: section 78 DNS lookups; interacts with lib/rfc1035.c */ |
10 | ||
582c2af2 FC |
11 | #include "squid.h" |
12 | #include "base/InstanceId.h" | |
602d9612 | 13 | #include "comm.h" |
55cbb02b | 14 | #include "comm/Connection.h" |
aed188fd | 15 | #include "comm/ConnOpener.h" |
d841c88d | 16 | #include "comm/Loops.h" |
7e66d5e2 | 17 | #include "comm/Read.h" |
d841c88d | 18 | #include "comm/Write.h" |
17852883 | 19 | #include "dlink.h" |
cfd66529 | 20 | #include "event.h" |
c4ad1349 | 21 | #include "fd.h" |
2c471ba8 | 22 | #include "fde.h" |
055421ee | 23 | #include "ip/tools.h" |
8a89c28f | 24 | #include "Mem.h" |
0eb49b6d | 25 | #include "MemBuf.h" |
8822ebee | 26 | #include "mgr/Registration.h" |
582c2af2 | 27 | #include "rfc3596.h" |
4d5904f7 | 28 | #include "SquidConfig.h" |
582c2af2 FC |
29 | #include "SquidTime.h" |
30 | #include "Store.h" | |
8d03bdb4 | 31 | #include "tools.h" |
7176768b | 32 | #include "util.h" |
d295d770 | 33 | #include "wordlist.h" |
68836b58 | 34 | |
9c0a2256 FC |
35 | #if SQUID_SNMP |
36 | #include "snmp_core.h" | |
37 | #endif | |
38 | ||
68836b58 | 39 | #if HAVE_ARPA_NAMESER_H |
40 | #include <arpa/nameser.h> | |
41 | #endif | |
1a30fdf5 | 42 | #include <cerrno> |
68836b58 | 43 | #if HAVE_RESOLV_H |
44 | #include <resolv.h> | |
45 | #endif | |
46 | ||
be266cb2 | 47 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
48 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
49 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
50 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 51 | #endif |
68836b58 | 52 | #ifndef _PATH_RESCONF |
53 | #define _PATH_RESCONF "/etc/resolv.conf" | |
54 | #endif | |
55 | #ifndef NS_DEFAULTPORT | |
56 | #define NS_DEFAULTPORT 53 | |
57 | #endif | |
58 | ||
59 | #ifndef NS_MAXDNAME | |
60 | #define NS_MAXDNAME 1025 | |
61 | #endif | |
62 | ||
63 | #ifndef MAXDNSRCH | |
64 | #define MAXDNSRCH 6 | |
7b724b86 | 65 | #endif |
68836b58 | 66 | |
67 | /* The buffer size required to store the maximum allowed search path */ | |
68 | #ifndef RESOLV_BUFSZ | |
69 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 70 | #endif |
71 | ||
42b51993 | 72 | #define IDNS_MAX_TRIES 20 |
e210930b | 73 | #define MAX_RCODE 17 |
558be27a | 74 | #define MAX_ATTEMPT 3 |
75 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
76 | // NP: see http://www.iana.org/assignments/dns-parameters |
77 | static const char *Rcodes[] = { | |
24520b1b AJ |
78 | /* RFC 1035 */ |
79 | "Success", | |
80 | "Packet Format Error", | |
81 | "DNS Server Failure", | |
82 | "Non-Existent Domain", | |
83 | "Not Implemented", | |
84 | "Query Refused", | |
85 | /* RFC 2136 */ | |
86 | "Name Exists when it should not", | |
87 | "RR Set Exists when it should not", | |
88 | "RR Set that should exist does not", | |
89 | "Server Not Authoritative for zone", | |
90 | "Name not contained in zone", | |
91 | /* unassigned */ | |
92 | "","","","","", | |
93 | /* RFC 2671 */ | |
94 | "Bad OPT Version or TSIG Signature Failure" | |
95 | }; | |
558be27a | 96 | |
58a39dc9 | 97 | typedef struct _idns_query idns_query; |
62e76326 | 98 | |
7b724b86 | 99 | typedef struct _ns ns; |
58a39dc9 | 100 | |
68836b58 | 101 | typedef struct _sp sp; |
102 | ||
d24ef4e9 | 103 | typedef struct _nsvc nsvc; |
104 | ||
26ac0430 | 105 | struct _idns_query { |
3074b9d1 | 106 | hash_link hash; |
9e1f210d | 107 | rfc1035_query query; |
68836b58 | 108 | char buf[RESOLV_BUFSZ]; |
109 | char name[NS_MAXDNAME + 1]; | |
110 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 111 | ssize_t sz; |
049441d9 | 112 | unsigned short query_id; /// random query ID sent to server; changes with every query sent |
13b08e1c | 113 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried |
91dcbd43 | 114 | |
58a39dc9 | 115 | int nsends; |
d24ef4e9 | 116 | int need_vc; |
a079e38b | 117 | bool permit_mdns; |
049441d9 | 118 | int pending; |
62e76326 | 119 | |
58a39dc9 | 120 | struct timeval start_t; |
121 | struct timeval sent_t; | |
820ee9fa | 122 | struct timeval queue_t; |
58a39dc9 | 123 | dlink_node lru; |
124 | IDNSCB *callback; | |
125 | void *callback_data; | |
558be27a | 126 | int attempt; |
7ba8d0b8 | 127 | int rcode; |
3074b9d1 | 128 | idns_query *queue; |
0e6432d0 HN |
129 | idns_query *slave; // single linked list |
130 | idns_query *master; // single pointer to a shared master | |
68836b58 | 131 | unsigned short domain; |
132 | unsigned short do_searchpath; | |
049441d9 HN |
133 | rfc1035_message *message; |
134 | int ancount; | |
33ab4aaf | 135 | const char *error; |
58a39dc9 | 136 | }; |
91dcbd43 | 137 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 138 | |
26ac0430 | 139 | struct _nsvc { |
d24ef4e9 | 140 | int ns; |
00406b24 | 141 | Comm::ConnectionPointer conn; |
d24ef4e9 | 142 | unsigned short msglen; |
143 | int read_msglen; | |
032785bf | 144 | MemBuf *msg; |
145 | MemBuf *queue; | |
d24ef4e9 | 146 | bool busy; |
147 | }; | |
148 | ||
26ac0430 | 149 | struct _ns { |
b7ac5457 | 150 | Ip::Address S; |
7b724b86 | 151 | int nqueries; |
152 | int nreplies; | |
e210930b AJ |
153 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
154 | int last_seen_edns; | |
155 | #endif | |
a079e38b | 156 | bool mDNSResolver; |
d24ef4e9 | 157 | nsvc *vc; |
7b724b86 | 158 | }; |
58a39dc9 | 159 | |
26ac0430 | 160 | struct _sp { |
68836b58 | 161 | char domain[NS_MAXDNAME]; |
162 | int queries; | |
163 | }; | |
164 | ||
d24ef4e9 | 165 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 166 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 167 | |
7b724b86 | 168 | static ns *nameservers = NULL; |
68836b58 | 169 | static sp *searchpath = NULL; |
7b724b86 | 170 | static int nns = 0; |
171 | static int nns_alloc = 0; | |
51aee437 | 172 | static int nns_mdns_count = 0; |
68836b58 | 173 | static int npc = 0; |
174 | static int npc_alloc = 0; | |
175 | static int ndots = 1; | |
7b724b86 | 176 | static dlink_list lru_list; |
7cfc1c9a | 177 | static int event_queued = 0; |
3074b9d1 | 178 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 179 | |
e210930b AJ |
180 | /* |
181 | * Notes on EDNS: | |
182 | * | |
183 | * IPv4: | |
184 | * EDNS as specified may be sent as an additional record for any request. | |
185 | * early testing has revealed that it works on common devices, but cannot | |
186 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
187 | * | |
188 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
189 | * | |
190 | * Squid design: | |
191 | * Squid is optimized to generate one packet and re-send it to all NS | |
192 | * due to this we cannot customize the EDNS size per NS. | |
193 | * | |
194 | * As such we take the configuration option value as fixed. | |
195 | * | |
196 | * FUTURE TODO: | |
197 | * This may not be worth doing, but if/when additional-records are parsed | |
198 | * we will be able to recover the OPT value specific to any one NS and | |
199 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
200 | * size our active NS are capable. | |
201 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
202 | * Responses from the configured NS may cause this to be raised or turned off. | |
203 | */ | |
204 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
205 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
206 | #endif | |
207 | ||
7b724b86 | 208 | static OBJH idnsStats; |
209 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 210 | static void idnsAddMDNSNameservers(); |
68836b58 | 211 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 212 | static void idnsFreeNameservers(void); |
68836b58 | 213 | static void idnsFreeSearchpath(void); |
a079e38b AJ |
214 | static bool idnsParseNameservers(void); |
215 | #if _SQUID_WINDOWS_ | |
216 | static bool idnsParseResolvConf(void); | |
1f1ae50a | 217 | #endif |
be266cb2 | 218 | #if _SQUID_WINDOWS_ |
a079e38b | 219 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 220 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 221 | #endif |
33ab4aaf | 222 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 223 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 224 | static IOCB idnsReadVCHeader; |
e0d28505 | 225 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 226 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
227 | static IOCB idnsReadVC; |
228 | static IOCB idnsSentQueryVC; | |
62e76326 | 229 | |
b7ac5457 | 230 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 231 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 232 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 233 | static PF idnsRead; |
7cfc1c9a | 234 | static EVH idnsCheckQueue; |
efd900cb | 235 | static void idnsTickleQueue(void); |
558be27a | 236 | static void idnsRcodeCount(int, int); |
575d05c4 | 237 | static CLCB idnsVCClosed; |
91dcbd43 | 238 | static unsigned short idnsQueryID(void); |
049441d9 | 239 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 240 | |
a079e38b AJ |
241 | static void |
242 | idnsCheckMDNS(idns_query *q) | |
243 | { | |
bce61b00 AJ |
244 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
245 | return; | |
246 | ||
a079e38b AJ |
247 | size_t slen = strlen(q->name); |
248 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
249 | q->permit_mdns = true; | |
250 | } | |
251 | } | |
252 | ||
253 | static void | |
254 | idnsAddMDNSNameservers() | |
255 | { | |
51aee437 | 256 | nns_mdns_count=0; |
a079e38b | 257 | |
bce61b00 AJ |
258 | // mDNS is disabled |
259 | if (!Config.onoff.dns_mdns) | |
260 | return; | |
261 | ||
a079e38b | 262 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
263 | if (Ip::EnableIpv6) { |
264 | idnsAddNameserver("FF02::FB"); | |
265 | nameservers[nns-1].S.port(5353); | |
266 | nameservers[nns-1].mDNSResolver = true; | |
267 | ++nns_mdns_count; | |
268 | } | |
a079e38b AJ |
269 | |
270 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 271 | nameservers[nns-1].S.port(5353); |
a079e38b | 272 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
273 | |
274 | ++nns_mdns_count; | |
a079e38b AJ |
275 | } |
276 | ||
7b724b86 | 277 | static void |
278 | idnsAddNameserver(const char *buf) | |
279 | { | |
b7ac5457 | 280 | Ip::Address A; |
62e76326 | 281 | |
cc192b50 | 282 | if (!(A = buf)) { |
fa84c01d | 283 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 284 | return; |
d20b1cd0 | 285 | } |
62e76326 | 286 | |
4dd643d5 | 287 | if (A.isAnyAddr()) { |
fa84c01d | 288 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 289 | A.setLocalhost(); |
fa84c01d | 290 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 291 | } |
62e76326 | 292 | |
4dd643d5 | 293 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
294 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
295 | return; | |
5c5a349d | 296 | } |
62e76326 | 297 | |
7b724b86 | 298 | if (nns == nns_alloc) { |
62e76326 | 299 | int oldalloc = nns_alloc; |
300 | ns *oldptr = nameservers; | |
301 | ||
302 | if (nns_alloc == 0) | |
303 | nns_alloc = 2; | |
304 | else | |
305 | nns_alloc <<= 1; | |
306 | ||
307 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
308 | ||
309 | if (oldptr && oldalloc) | |
41d00cd3 | 310 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 311 | |
312 | if (oldptr) | |
313 | safe_free(oldptr); | |
7b724b86 | 314 | } |
62e76326 | 315 | |
7b724b86 | 316 | assert(nns < nns_alloc); |
4dd643d5 | 317 | A.port(NS_DEFAULTPORT); |
cc192b50 | 318 | nameservers[nns].S = A; |
e210930b AJ |
319 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
320 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
321 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
322 | #endif | |
cc192b50 | 323 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 324 | ++nns; |
7b724b86 | 325 | } |
326 | ||
68836b58 | 327 | static void |
328 | idnsAddPathComponent(const char *buf) | |
329 | { | |
330 | if (npc == npc_alloc) { | |
331 | int oldalloc = npc_alloc; | |
332 | sp *oldptr = searchpath; | |
333 | ||
334 | if (0 == npc_alloc) | |
335 | npc_alloc = 2; | |
336 | else | |
337 | npc_alloc <<= 1; | |
338 | ||
339 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
340 | ||
341 | if (oldptr && oldalloc) | |
41d00cd3 | 342 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 343 | |
344 | if (oldptr) | |
345 | safe_free(oldptr); | |
346 | } | |
347 | ||
348 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
349 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
350 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 351 | Tolower(searchpath[npc].domain); |
bf8fe701 | 352 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 353 | ++npc; |
68836b58 | 354 | } |
355 | ||
7b724b86 | 356 | static void |
357 | idnsFreeNameservers(void) | |
358 | { | |
359 | safe_free(nameservers); | |
360 | nns = nns_alloc = 0; | |
361 | } | |
362 | ||
68836b58 | 363 | static void |
364 | idnsFreeSearchpath(void) | |
365 | { | |
366 | safe_free(searchpath); | |
367 | npc = npc_alloc = 0; | |
368 | } | |
369 | ||
a079e38b | 370 | static bool |
efd900cb | 371 | idnsParseNameservers(void) |
372 | { | |
a079e38b AJ |
373 | bool result = false; |
374 | for (wordlist *w = Config.dns_nameservers; w; w = w->next) { | |
e0236918 | 375 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 376 | idnsAddNameserver(w->key); |
a079e38b | 377 | result = true; |
efd900cb | 378 | } |
a079e38b | 379 | return result; |
efd900cb | 380 | } |
381 | ||
7aa9bb3e | 382 | #if !_SQUID_WINDOWS_ |
a079e38b | 383 | static bool |
7b724b86 | 384 | idnsParseResolvConf(void) |
385 | { | |
386 | FILE *fp; | |
68836b58 | 387 | char buf[RESOLV_BUFSZ]; |
a083e75a | 388 | const char *t; |
a079e38b | 389 | bool result = false; |
68836b58 | 390 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 391 | |
7b724b86 | 392 | if (fp == NULL) { |
e0236918 | 393 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
a079e38b | 394 | return false; |
7b724b86 | 395 | } |
62e76326 | 396 | |
be266cb2 | 397 | #if _SQUID_CYGWIN_ |
c4aefe96 | 398 | setmode(fileno(fp), O_TEXT); |
399 | #endif | |
62e76326 | 400 | |
68836b58 | 401 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 402 | t = strtok(buf, w_space); |
403 | ||
68836b58 | 404 | if (NULL == t) { |
62e76326 | 405 | continue; |
a37d6070 | 406 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 407 | t = strtok(NULL, w_space); |
62e76326 | 408 | |
68836b58 | 409 | if (NULL == t) |
410 | continue; | |
62e76326 | 411 | |
e0236918 | 412 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 413 | |
68836b58 | 414 | idnsAddNameserver(t); |
a079e38b | 415 | result = true; |
a37d6070 | 416 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
417 | idnsFreeSearchpath(); |
418 | t = strtok(NULL, w_space); | |
a083e75a | 419 | |
26ac0430 AJ |
420 | if (NULL == t) |
421 | continue; | |
a083e75a | 422 | |
e0236918 | 423 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 424 | |
26ac0430 | 425 | idnsAddPathComponent(t); |
a37d6070 | 426 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 427 | idnsFreeSearchpath(); |
68836b58 | 428 | while (NULL != t) { |
429 | t = strtok(NULL, w_space); | |
430 | ||
431 | if (NULL == t) | |
432 | continue; | |
433 | ||
e0236918 | 434 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 435 | |
436 | idnsAddPathComponent(t); | |
437 | } | |
a37d6070 | 438 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 439 | while (NULL != t) { |
440 | t = strtok(NULL, w_space); | |
62e76326 | 441 | |
68836b58 | 442 | if (NULL == t) |
443 | continue; | |
62e76326 | 444 | |
2c2da7d3 | 445 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 446 | ndots = atoi(t + 6); |
447 | ||
448 | if (ndots < 1) | |
449 | ndots = 1; | |
450 | ||
e0236918 | 451 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 452 | } |
453 | } | |
454 | } | |
7b724b86 | 455 | } |
a083e75a | 456 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
457 | t = strchr(t, '.'); |
458 | if (t) | |
459 | idnsAddPathComponent(t+1); | |
a083e75a | 460 | } |
62e76326 | 461 | |
7b724b86 | 462 | fclose(fp); |
a079e38b | 463 | return result; |
7b724b86 | 464 | } |
465 | ||
1f1ae50a | 466 | #endif |
467 | ||
be266cb2 | 468 | #if _SQUID_WINDOWS_ |
6b610e34 | 469 | static void |
d02b72b4 | 470 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 471 | { |
a16cb11f | 472 | char *t; |
6b610e34 | 473 | char *token; |
474 | HKEY hndKey; | |
475 | ||
0dde2160 | 476 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 477 | DWORD Type = 0; |
478 | DWORD Size = 0; | |
479 | LONG Result; | |
04f7fd38 | 480 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
481 | |
482 | if (Result == ERROR_SUCCESS && Size) { | |
483 | t = (char *) xmalloc(Size); | |
0dde2160 | 484 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 485 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
486 | idnsAddPathComponent(t); |
487 | xfree(t); | |
488 | } | |
04f7fd38 | 489 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 490 | |
491 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 492 | t = (char *) xmalloc(Size); |
04f7fd38 | 493 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 494 | token = strtok(t, Separator); |
6b610e34 | 495 | |
496 | while (token) { | |
497 | idnsAddPathComponent(token); | |
e0236918 | 498 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 499 | token = strtok(NULL, Separator); |
500 | } | |
26ac0430 | 501 | xfree(t); |
6b610e34 | 502 | } |
503 | ||
504 | RegCloseKey(hndKey); | |
505 | } | |
a6cae565 | 506 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
507 | t = strchr(t, '.'); |
508 | if (t) | |
509 | idnsAddPathComponent(t + 1); | |
a16cb11f | 510 | } |
6b610e34 | 511 | } |
512 | ||
a079e38b | 513 | static bool |
0e6d05ef | 514 | idnsParseWIN32Registry(void) |
515 | { | |
a16cb11f | 516 | char *t; |
0e6d05ef | 517 | char *token; |
518 | HKEY hndKey, hndKey2; | |
a079e38b | 519 | bool result = false; |
0e6d05ef | 520 | |
0e6d05ef | 521 | switch (WIN32_OS_version) { |
62e76326 | 522 | |
0e6d05ef | 523 | case _WIN_OS_WINNT: |
62e76326 | 524 | /* get nameservers from the Windows NT registry */ |
525 | ||
04f7fd38 | 526 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 527 | DWORD Type = 0; |
528 | DWORD Size = 0; | |
529 | LONG Result; | |
04f7fd38 | 530 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 531 | |
532 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 533 | t = (char *) xmalloc(Size); |
0dde2160 | 534 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 535 | token = strtok(t, ", "); |
62e76326 | 536 | |
537 | while (token) { | |
538 | idnsAddNameserver(token); | |
a079e38b | 539 | result = true; |
e0236918 | 540 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 541 | token = strtok(NULL, ","); |
62e76326 | 542 | } |
26ac0430 | 543 | xfree(t); |
62e76326 | 544 | } |
545 | ||
0dde2160 | 546 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 547 | |
548 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 549 | t = (char *) xmalloc(Size); |
a6cae565 | 550 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 551 | token = strtok(t, ", "); |
62e76326 | 552 | |
553 | while (token) { | |
e0236918 | 554 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 555 | idnsAddNameserver(token); |
a079e38b | 556 | result = true; |
62e76326 | 557 | token = strtok(NULL, ", "); |
558 | } | |
26ac0430 | 559 | xfree(t); |
62e76326 | 560 | } |
561 | ||
562 | RegCloseKey(hndKey); | |
563 | } | |
564 | ||
6b610e34 | 565 | idnsParseWIN32SearchList(" "); |
566 | ||
62e76326 | 567 | break; |
568 | ||
0e6d05ef | 569 | case _WIN_OS_WIN2K: |
62e76326 | 570 | |
b671cc68 | 571 | case _WIN_OS_WINXP: |
62e76326 | 572 | |
6b1846cf | 573 | case _WIN_OS_WINNET: |
28170269 | 574 | |
575 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
576 | |
577 | case _WIN_OS_WIN7: | |
62e76326 | 578 | /* get nameservers from the Windows 2000 registry */ |
579 | /* search all interfaces for DNS server addresses */ | |
580 | ||
04f7fd38 | 581 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 582 | int i; |
04f7fd38 AJ |
583 | DWORD MaxSubkeyLen, InterfacesCount; |
584 | char *keyname; | |
585 | FILETIME ftLastWriteTime; | |
586 | ||
587 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
588 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 589 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
590 | DWORD j; |
591 | j = MaxSubkeyLen; | |
592 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
593 | char *newkeyname; | |
594 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
595 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
596 | strcat(newkeyname, "\\"); | |
597 | strcat(newkeyname, keyname); | |
598 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
599 | DWORD Type = 0; | |
600 | DWORD Size = 0; | |
601 | LONG Result; | |
602 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
603 | if (Result == ERROR_SUCCESS && Size) { | |
604 | t = (char *) xmalloc(Size); | |
605 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
606 | token = strtok(t, ", "); | |
607 | while (token) { | |
e0236918 | 608 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 609 | idnsAddNameserver(token); |
a079e38b | 610 | result = true; |
04f7fd38 AJ |
611 | token = strtok(NULL, ", "); |
612 | } | |
613 | xfree(t); | |
614 | } | |
615 | ||
616 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
617 | if (Result == ERROR_SUCCESS && Size) { | |
618 | t = (char *) xmalloc(Size); | |
619 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
620 | token = strtok(t, ", "); | |
621 | while (token) { | |
e0236918 | 622 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 623 | idnsAddNameserver(token); |
a079e38b | 624 | result = true; |
04f7fd38 AJ |
625 | token = strtok(NULL, ", "); |
626 | } | |
627 | ||
628 | xfree(t); | |
62e76326 | 629 | } |
62e76326 | 630 | |
0dde2160 | 631 | RegCloseKey(hndKey2); |
62e76326 | 632 | } |
633 | ||
04f7fd38 | 634 | xfree(newkeyname); |
62e76326 | 635 | } |
636 | } | |
0dde2160 | 637 | |
04f7fd38 | 638 | xfree(keyname); |
62e76326 | 639 | } |
640 | ||
641 | RegCloseKey(hndKey); | |
642 | } | |
643 | ||
6b610e34 | 644 | idnsParseWIN32SearchList(", "); |
645 | ||
62e76326 | 646 | break; |
647 | ||
0e6d05ef | 648 | case _WIN_OS_WIN95: |
62e76326 | 649 | |
0e6d05ef | 650 | case _WIN_OS_WIN98: |
62e76326 | 651 | |
be20dac7 | 652 | case _WIN_OS_WINME: |
62e76326 | 653 | /* get nameservers from the Windows 9X registry */ |
654 | ||
04f7fd38 | 655 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 656 | DWORD Type = 0; |
657 | DWORD Size = 0; | |
658 | LONG Result; | |
04f7fd38 | 659 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 660 | |
661 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 662 | t = (char *) xmalloc(Size); |
a6cae565 | 663 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 664 | token = strtok(t, ", "); |
62e76326 | 665 | |
666 | while (token) { | |
e0236918 | 667 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 668 | idnsAddNameserver(token); |
a079e38b | 669 | result = true; |
62e76326 | 670 | token = strtok(NULL, ", "); |
671 | } | |
26ac0430 | 672 | xfree(t); |
62e76326 | 673 | } |
674 | ||
675 | RegCloseKey(hndKey); | |
676 | } | |
677 | ||
678 | break; | |
679 | ||
0e6d05ef | 680 | default: |
e0236918 | 681 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 682 | } |
a079e38b AJ |
683 | |
684 | return result; | |
0e6d05ef | 685 | } |
62e76326 | 686 | |
0e6d05ef | 687 | #endif |
688 | ||
7b724b86 | 689 | static void |
690 | idnsStats(StoreEntry * sentry) | |
691 | { | |
a16b4aa0 | 692 | dlink_node *n; |
693 | idns_query *q; | |
7cfc1c9a | 694 | int i; |
558be27a | 695 | int j; |
cc192b50 | 696 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 697 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 698 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 699 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
700 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
701 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 702 | |
a16b4aa0 | 703 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 704 | q = (idns_query *)n->data; |
bce61b00 | 705 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 706 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 707 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
708 | tvSubDsec(q->sent_t, current_time), |
709 | (q->permit_mdns? 'M':' '), | |
710 | q->name); | |
7cfc1c9a | 711 | } |
62e76326 | 712 | |
e210930b | 713 | if (Config.dns.packet_max > 0) |
bce61b00 | 714 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 715 | else |
bce61b00 | 716 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 717 | |
7cfc1c9a | 718 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
719 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
720 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 721 | |
95dc7ff4 | 722 | for (i = 0; i < nns; ++i) { |
a079e38b | 723 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 724 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 725 | nameservers[i].nqueries, |
a079e38b AJ |
726 | nameservers[i].nreplies, |
727 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 728 | } |
62e76326 | 729 | |
558be27a | 730 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
731 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 732 | |
95dc7ff4 | 733 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 734 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
735 | ||
e210930b | 736 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 737 | |
95dc7ff4 | 738 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
739 | if (j > 10 && j < 16) |
740 | continue; // unassigned by IANA. | |
741 | ||
62e76326 | 742 | storeAppendPrintf(sentry, "%5d", j); |
743 | ||
95dc7ff4 | 744 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 745 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
746 | ||
e210930b | 747 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 748 | } |
6b610e34 | 749 | |
750 | if (npc) { | |
751 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
752 | ||
95dc7ff4 | 753 | for (i=0; i < npc; ++i) |
6b610e34 | 754 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
755 | ||
756 | storeAppendPrintf(sentry, "\n"); | |
757 | } | |
7b724b86 | 758 | } |
759 | ||
efd900cb | 760 | static void |
761 | idnsTickleQueue(void) | |
762 | { | |
763 | if (event_queued) | |
62e76326 | 764 | return; |
765 | ||
efd900cb | 766 | if (NULL == lru_list.tail) |
62e76326 | 767 | return; |
768 | ||
fd0f51c4 CT |
769 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
770 | ||
771 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 772 | |
efd900cb | 773 | event_queued = 1; |
774 | } | |
775 | ||
d24ef4e9 | 776 | static void |
c8407295 | 777 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *buf, size_t size, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 778 | { |
779 | nsvc * vc = (nsvc *)data; | |
780 | ||
c8407295 | 781 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 782 | return; |
af6a12ee | 783 | |
e0d28505 AJ |
784 | // XXX: irrelevant now that we have conn pointer? |
785 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 786 | return; |
d24ef4e9 | 787 | |
c8407295 | 788 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 789 | conn->close(); |
d24ef4e9 | 790 | return; |
791 | } | |
792 | ||
793 | vc->busy = 0; | |
794 | idnsDoSendQueryVC(vc); | |
795 | } | |
796 | ||
797 | static void | |
798 | idnsDoSendQueryVC(nsvc *vc) | |
799 | { | |
800 | if (vc->busy) | |
801 | return; | |
802 | ||
032785bf | 803 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 804 | return; |
805 | ||
8401d6fc AR |
806 | // if retrying after a TC UDP response, our close handler cb may be pending |
807 | if (fd_table[vc->conn->fd].closing()) | |
808 | return; | |
809 | ||
032785bf | 810 | MemBuf *mb = vc->queue; |
d24ef4e9 | 811 | |
032785bf | 812 | vc->queue = new MemBuf; |
d24ef4e9 | 813 | |
814 | vc->busy = 1; | |
815 | ||
fd0f51c4 | 816 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
817 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
818 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 819 | AsyncCall::Pointer nil; |
d4b21972 | 820 | |
1b76e6c1 | 821 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 822 | |
ec41b64c AJ |
823 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
824 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 825 | Comm::Write(vc->conn, mb, call); |
032785bf | 826 | |
827 | delete mb; | |
d24ef4e9 | 828 | } |
829 | ||
830 | static void | |
c8407295 | 831 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int xerrno, void *data) |
d24ef4e9 | 832 | { |
833 | nsvc * vc = (nsvc *)data; | |
834 | ||
c8407295 | 835 | if (status != Comm::OK || !conn) { |
dd3fb890 AR |
836 | char buf[MAX_IPSTRLEN] = ""; |
837 | if (vc->ns < nns) | |
4dd643d5 | 838 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 839 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 840 | return; |
841 | } | |
842 | ||
00406b24 | 843 | vc->conn = conn; |
cfd66529 AJ |
844 | |
845 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
846 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
847 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
848 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 849 | vc->busy = 0; |
850 | idnsDoSendQueryVC(vc); | |
851 | } | |
852 | ||
853 | static void | |
575d05c4 | 854 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 855 | { |
575d05c4 | 856 | nsvc * vc = (nsvc *)params.data; |
032785bf | 857 | delete vc->queue; |
858 | delete vc->msg; | |
00406b24 | 859 | vc->conn = NULL; |
f64091a7 | 860 | if (vc->ns < nns) // XXX: dnsShutdown may have freed nameservers[] |
dd3fb890 | 861 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 862 | cbdataFree(vc); |
d24ef4e9 | 863 | } |
864 | ||
865 | static void | |
9dca980d | 866 | idnsInitVC(int nsv) |
d24ef4e9 | 867 | { |
868 | nsvc *vc = cbdataAlloc(nsvc); | |
9dca980d | 869 | assert(nsv < nns); |
00406b24 | 870 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d AJ |
871 | nameservers[nsv].vc = vc; |
872 | vc->ns = nsv; | |
032785bf | 873 | vc->queue = new MemBuf; |
032785bf | 874 | vc->msg = new MemBuf; |
cfd66529 | 875 | vc->busy = 1; |
d24ef4e9 | 876 | |
00406b24 | 877 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 878 | |
4dd643d5 | 879 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 880 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 881 | else |
7fb5be3e | 882 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 883 | |
7fb5be3e | 884 | if (conn->remote.isIPv4()) |
4dd643d5 | 885 | conn->local.setIPv4(); |
f5ba22ff | 886 | |
cfd66529 | 887 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 888 | |
4accd6d8 | 889 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 890 | cs->setHost("DNS TCP Socket"); |
855150a4 | 891 | AsyncJob::Start(cs); |
d24ef4e9 | 892 | } |
893 | ||
894 | static void | |
9dca980d | 895 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 896 | { |
9dca980d AJ |
897 | assert(nsn < nns); |
898 | if (nameservers[nsn].vc == NULL) | |
899 | idnsInitVC(nsn); | |
d24ef4e9 | 900 | |
9dca980d | 901 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 902 | |
445962f3 HN |
903 | if (!vc) { |
904 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 905 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
906 | |
907 | return; | |
908 | } | |
909 | ||
2fe7eff9 | 910 | vc->queue->reset(); |
d24ef4e9 | 911 | |
912 | short head = htons(q->sz); | |
913 | ||
2fe7eff9 | 914 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 915 | |
2fe7eff9 | 916 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 917 | |
918 | idnsDoSendQueryVC(vc); | |
919 | } | |
920 | ||
7b724b86 | 921 | static void |
922 | idnsSendQuery(idns_query * q) | |
923 | { | |
4d6c8504 | 924 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 925 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 926 | return; |
0a69973e | 927 | } |
62e76326 | 928 | |
cc192b50 | 929 | if (nns <= 0) { |
e0236918 | 930 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 931 | return; |
932 | } | |
62e76326 | 933 | |
7b724b86 | 934 | assert(q->lru.next == NULL); |
62e76326 | 935 | |
7b724b86 | 936 | assert(q->lru.prev == NULL); |
62e76326 | 937 | |
4d6c8504 | 938 | int x = -1, y = -1; |
9dca980d | 939 | int nsn; |
4d6c8504 | 940 | |
213b6c90 | 941 | do { |
a079e38b AJ |
942 | // only use mDNS resolvers for mDNS compatible queries |
943 | if (!q->permit_mdns) | |
51aee437 | 944 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
945 | else |
946 | nsn = q->nsends % nns; | |
213b6c90 AJ |
947 | |
948 | if (q->need_vc) { | |
9dca980d | 949 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 950 | x = y = 0; |
213b6c90 | 951 | } else { |
4dd643d5 | 952 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 953 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 954 | else if (DnsSocketA >= 0) |
9dca980d | 955 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 956 | } |
62e76326 | 957 | |
95dc7ff4 | 958 | ++ q->nsends; |
62e76326 | 959 | |
33ab4aaf | 960 | q->sent_t = current_time; |
62e76326 | 961 | |
4dd643d5 | 962 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
e0236918 | 963 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4dd643d5 | 964 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
e0236918 | 965 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
966 | |
967 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 968 | |
bd6a0c8f | 969 | if (y > 0) { |
4d6c8504 | 970 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 971 | } |
bd6a0c8f | 972 | if (x > 0) { |
4d6c8504 | 973 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 974 | } |
62e76326 | 975 | |
9dca980d | 976 | ++ nameservers[nsn].nqueries; |
c131f066 | 977 | q->queue_t = current_time; |
7b724b86 | 978 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 979 | q->pending = 1; |
efd900cb | 980 | idnsTickleQueue(); |
7b724b86 | 981 | } |
982 | ||
983 | static int | |
b7ac5457 | 984 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 985 | { |
986 | int i; | |
62e76326 | 987 | |
95dc7ff4 | 988 | for (i = 0; i < nns; ++i) { |
cc192b50 | 989 | if (nameservers[i].S != from) |
62e76326 | 990 | continue; |
991 | ||
4dd643d5 | 992 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 993 | continue; |
994 | ||
995 | return i; | |
7b724b86 | 996 | } |
62e76326 | 997 | |
7cfc1c9a | 998 | return -1; |
7b724b86 | 999 | } |
1000 | ||
1001 | static idns_query * | |
1002 | idnsFindQuery(unsigned short id) | |
1003 | { | |
1004 | dlink_node *n; | |
1005 | idns_query *q; | |
62e76326 | 1006 | |
7b724b86 | 1007 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1008 | q = (idns_query*)n->data; |
1009 | ||
049441d9 | 1010 | if (q->query_id == id) |
62e76326 | 1011 | return q; |
7b724b86 | 1012 | } |
62e76326 | 1013 | |
7b724b86 | 1014 | return NULL; |
1015 | } | |
1016 | ||
108d67a0 | 1017 | static unsigned short |
1018 | idnsQueryID(void) | |
1019 | { | |
1020 | unsigned short id = squid_random() & 0xFFFF; | |
1021 | unsigned short first_id = id; | |
1022 | ||
26ac0430 | 1023 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1024 | ++id; |
108d67a0 | 1025 | |
846c8960 | 1026 | if (id == first_id) { |
e0236918 | 1027 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1028 | break; |
846c8960 | 1029 | } |
108d67a0 | 1030 | } |
1031 | ||
846c8960 | 1032 | return id; |
108d67a0 | 1033 | } |
1034 | ||
3074b9d1 | 1035 | static void |
33ab4aaf | 1036 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1037 | { |
1038 | IDNSCB *callback; | |
1039 | void *cbdata; | |
1040 | ||
33ab4aaf HN |
1041 | if (error) |
1042 | q->error = error; | |
1043 | ||
1044 | if (q->master) | |
1045 | q = q->master; | |
1046 | ||
33ab4aaf | 1047 | // If any of our subqueries are still pending then wait for them to complete before continuing |
9dca980d | 1048 | for (idns_query *q2 = q; q2; q2 = q2->slave) { |
33ab4aaf HN |
1049 | if (q2->pending) { |
1050 | return; | |
1051 | } | |
1052 | } | |
1053 | ||
1054 | /* Merge results */ | |
1055 | rfc1035_message *message = q->message; | |
1056 | q->message = NULL; | |
1057 | int n = q->ancount; | |
1058 | error = q->error; | |
1059 | ||
9dca980d | 1060 | while ( idns_query *q2 = q->slave ) { |
33ab4aaf HN |
1061 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); |
1062 | q->slave = q2->slave; | |
1063 | if ( !q2->error ) { | |
1064 | if (n > 0) { | |
1065 | // two sets of RR need merging | |
1066 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1067 | if (Config.dns.v4_first) { | |
1068 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1069 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1070 | } else { | |
1071 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1072 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1073 | } | |
1074 | n += q2->ancount; | |
1075 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1076 | // result, do not free them here | |
1077 | safe_free(message->answer); | |
1078 | safe_free(q2->message->answer); | |
1079 | message->answer = result; | |
1080 | message->ancount += q2->message->ancount; | |
1081 | } else { | |
1082 | // first response empty or failed, just use the second | |
1083 | rfc1035MessageDestroy(&message); | |
1084 | message = q2->message; | |
1085 | q2->message = NULL; | |
1086 | n = q2->ancount; | |
1087 | error = NULL; | |
1088 | } | |
1089 | } | |
1090 | rfc1035MessageDestroy(&q2->message); | |
1091 | cbdataFree(q2); | |
1092 | } | |
1093 | ||
1094 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1095 | ||
3074b9d1 | 1096 | callback = q->callback; |
1097 | q->callback = NULL; | |
33ab4aaf | 1098 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1099 | |
1100 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1101 | callback(cbdata, answers, n, error); | |
1102 | ||
26ac0430 | 1103 | while (q->queue) { |
3074b9d1 | 1104 | idns_query *q2 = q->queue; |
1105 | q->queue = q2->queue; | |
1106 | callback = q2->callback; | |
1107 | q2->callback = NULL; | |
1108 | ||
1109 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1110 | callback(cbdata, answers, n, error); | |
1111 | ||
63a0e6b7 | 1112 | cbdataFree(q2); |
3074b9d1 | 1113 | } |
1114 | ||
1115 | if (q->hash.key) { | |
1116 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1117 | q->hash.key = NULL; | |
1118 | } | |
33ab4aaf HN |
1119 | |
1120 | rfc1035MessageDestroy(&message); | |
1121 | cbdataFree(q); | |
3074b9d1 | 1122 | } |
1123 | ||
7b724b86 | 1124 | static void |
e210930b | 1125 | idnsGrokReply(const char *buf, size_t sz, int from_ns) |
7b724b86 | 1126 | { |
1127 | int n; | |
ec7bade0 | 1128 | rfc1035_message *message = NULL; |
7b724b86 | 1129 | idns_query *q; |
3074b9d1 | 1130 | |
cc192b50 | 1131 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1132 | |
ec7bade0 | 1133 | if (message == NULL) { |
e0236918 | 1134 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1135 | return; |
7b724b86 | 1136 | } |
62e76326 | 1137 | |
91dcbd43 | 1138 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1139 | |
1140 | q = idnsFindQuery(message->id); | |
1141 | ||
7b724b86 | 1142 | if (q == NULL) { |
bf8fe701 | 1143 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1144 | rfc1035MessageDestroy(&message); |
62e76326 | 1145 | return; |
7b724b86 | 1146 | } |
62e76326 | 1147 | |
9e1f210d | 1148 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1149 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1150 | rfc1035MessageDestroy(&message); |
9e1f210d | 1151 | return; |
1152 | } | |
1153 | ||
e210930b AJ |
1154 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1155 | // TODO: actually gr the message right here. | |
1156 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q | |
1157 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1158 | // AND allows us to merge AN+AR sections from both responses (one day) | |
1159 | ||
1160 | if (q->edns_seen >= 0) { | |
1161 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1162 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1163 | // the altered NS was limiting the whole group. | |
1164 | max_shared_edns = q->edns_seen; | |
1165 | // may be limited by one of the others still | |
95dc7ff4 | 1166 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1167 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1168 | } else { | |
1169 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1170 | // maybe reduce the global limit downwards to accomodate this NS | |
1171 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1172 | } | |
1173 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1174 | max_shared_edns = -1; | |
1175 | } | |
1176 | #endif | |
1177 | ||
049441d9 HN |
1178 | dlinkDelete(&q->lru, &lru_list); |
1179 | q->pending = 0; | |
1180 | ||
d24ef4e9 | 1181 | if (message->tc) { |
bae9832d | 1182 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1183 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1184 | |
1185 | if (!q->need_vc) { | |
1186 | q->need_vc = 1; | |
5e263176 | 1187 | -- q->nsends; |
d24ef4e9 | 1188 | idnsSendQuery(q); |
91dcbd43 CT |
1189 | } else { |
1190 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1191 | // Return an error and cleanup; no point in trying TCP again. | |
1192 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1193 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1194 | } |
1195 | ||
1196 | return; | |
1197 | } | |
9e1f210d | 1198 | |
558be27a | 1199 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1200 | |
558be27a | 1201 | if (n < 0) { |
7ba8d0b8 | 1202 | q->rcode = -n; |
42687bb2 | 1203 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1204 | |
95dc7ff4 | 1205 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1206 | /* |
1207 | * RCODE 2 is "Server failure - The name server was | |
1208 | * unable to process this query due to a problem with | |
1209 | * the name server." | |
1210 | */ | |
cc192b50 | 1211 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1212 | rfc1035MessageDestroy(&message); | |
62e76326 | 1213 | idnsSendQuery(q); |
1214 | return; | |
1215 | } | |
68836b58 | 1216 | |
0e6432d0 HN |
1217 | // Do searchpath processing on the master A query only to keep |
1218 | // things simple. NXDOMAIN is authorative for the label, not | |
1219 | // the record type. | |
049441d9 | 1220 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1221 | assert(NULL == message->answer); |
1222 | strcpy(q->name, q->orig); | |
1223 | ||
cc192b50 | 1224 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1225 | ||
68836b58 | 1226 | if (q->domain < npc) { |
1227 | strcat(q->name, "."); | |
1228 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1229 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1230 | ++ q->domain; |
68836b58 | 1231 | } else { |
95dc7ff4 | 1232 | ++ q->attempt; |
68836b58 | 1233 | } |
1234 | ||
049441d9 | 1235 | rfc1035MessageDestroy(&message); |
cc192b50 | 1236 | |
33ab4aaf | 1237 | // cleanup slave AAAA query |
049441d9 HN |
1238 | while (idns_query *slave = q->slave) { |
1239 | dlinkDelete(&slave->lru, &lru_list); | |
1240 | q->slave = slave->slave; | |
1241 | rfc1035MessageDestroy(&slave->message); | |
1242 | cbdataFree(slave); | |
cc192b50 | 1243 | } |
c7ba545e | 1244 | |
049441d9 HN |
1245 | // Build new query |
1246 | q->query_id = idnsQueryID(); | |
1247 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1248 | // see EDNS notes at top of file why this sends 0 | |
1249 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1250 | if (q->sz < 0) { |
1251 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1252 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1253 | return; |
1254 | } | |
1255 | ||
33ab4aaf HN |
1256 | q->nsends = 0; |
1257 | ||
a079e38b | 1258 | idnsCheckMDNS(q); |
68836b58 | 1259 | idnsSendQuery(q); |
049441d9 HN |
1260 | if (Ip::EnableIpv6) |
1261 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1262 | return; |
1263 | } | |
558be27a | 1264 | } |
62e76326 | 1265 | |
049441d9 HN |
1266 | q->message = message; |
1267 | q->ancount = n; | |
cc192b50 | 1268 | |
33ab4aaf HN |
1269 | if (n >= 0) |
1270 | idnsCallback(q, NULL); | |
1271 | else | |
1272 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1273 | |
7b724b86 | 1274 | } |
1275 | ||
1276 | static void | |
1277 | idnsRead(int fd, void *data) | |
1278 | { | |
d193a436 | 1279 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1280 | int len; |
42b51993 | 1281 | int max = INCOMING_DNS_MAX; |
d29b40de | 1282 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1283 | Ip::Address from; |
cc192b50 | 1284 | |
d7e7eaa7 | 1285 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1286 | |
bd6a0c8f HN |
1287 | // Always keep reading. This stops (or at least makes harder) several |
1288 | // attacks on the DNS client. | |
d841c88d | 1289 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1290 | |
cc192b50 | 1291 | /* BUG (UNRESOLVED) |
1292 | * two code lines after returning from comm_udprecvfrom() | |
1293 | * something overwrites the memory behind the from parameter. | |
1294 | * NO matter where in the stack declaration list above it is placed | |
1295 | * The cause of this is still unknown, however copying the data appears | |
1296 | * to allow it to be passed further without this erasure. | |
1297 | */ | |
b7ac5457 | 1298 | Ip::Address bugbypass; |
62e76326 | 1299 | |
5e263176 FC |
1300 | while (max) { |
1301 | --max; | |
cc192b50 | 1302 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1303 | |
cc192b50 | 1304 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1305 | |
1306 | if (len == 0) | |
1307 | break; | |
1308 | ||
1309 | if (len < 0) { | |
1310 | if (ignoreErrno(errno)) | |
1311 | break; | |
1312 | ||
1191b93b | 1313 | #if _SQUID_LINUX_ |
62e76326 | 1314 | /* Some Linux systems seem to set the FD for reading and then |
1315 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1316 | * port unreachable message. */ | |
1317 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1318 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1319 | #endif |
62e76326 | 1320 | |
e0236918 | 1321 | debugs(50, DBG_IMPORTANT, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1322 | |
1323 | break; | |
1324 | } | |
1325 | ||
055421ee | 1326 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1327 | |
62e76326 | 1328 | assert(N); |
aec55359 | 1329 | ++(*N); |
cc192b50 | 1330 | |
1331 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1332 | ||
1333 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1334 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1335 | |
9dca980d AJ |
1336 | if (nsn >= 0) { |
1337 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1338 | } |
1339 | ||
1340 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1341 | // but after the ++ above to keep statistics right. | |
1342 | if (!lru_list.head) | |
1343 | continue; // Don't process replies if there is no pending query. | |
1344 | ||
9dca980d | 1345 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1346 | static time_t last_warning = 0; |
1347 | ||
1348 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1349 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1350 | last_warning = squid_curtime; |
26ac0430 | 1351 | } else { |
e0236918 | 1352 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1353 | } |
1354 | continue; | |
62e76326 | 1355 | } |
1356 | ||
9dca980d | 1357 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1358 | } |
1359 | } | |
1360 | ||
7cfc1c9a | 1361 | static void |
1362 | idnsCheckQueue(void *unused) | |
1363 | { | |
1364 | dlink_node *n; | |
0c4fe9e4 | 1365 | dlink_node *p = NULL; |
7cfc1c9a | 1366 | idns_query *q; |
1367 | event_queued = 0; | |
62e76326 | 1368 | |
820ee9fa AJ |
1369 | if (0 == nns) |
1370 | /* name servers went away; reconfiguring or shutting down */ | |
1371 | return; | |
1372 | ||
0c4fe9e4 | 1373 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1374 | |
820ee9fa | 1375 | p = n->prev; |
733cedc0 | 1376 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1377 | |
820ee9fa | 1378 | /* Anything to process in the queue? */ |
fd0f51c4 | 1379 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1380 | break; |
62e76326 | 1381 | |
33ab4aaf | 1382 | /* Query timer still running? */ |
fd0f51c4 | 1383 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1384 | dlinkDelete(&q->lru, &lru_list); |
1385 | q->queue_t = current_time; | |
1386 | dlinkAdd(q, &q->lru, &lru_list); | |
1387 | continue; | |
1388 | } | |
62e76326 | 1389 | |
91dcbd43 CT |
1390 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1391 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1392 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1393 | |
1394 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1395 | q->pending = 0; |
62e76326 | 1396 | |
fd0f51c4 | 1397 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1398 | idnsSendQuery(q); |
1399 | } else { | |
91dcbd43 | 1400 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1401 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1402 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1403 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1404 | |
1405 | if (q->rcode != 0) | |
33ab4aaf | 1406 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1407 | else |
33ab4aaf | 1408 | idnsCallback(q, "Timeout"); |
62e76326 | 1409 | } |
7cfc1c9a | 1410 | } |
62e76326 | 1411 | |
efd900cb | 1412 | idnsTickleQueue(); |
7cfc1c9a | 1413 | } |
1414 | ||
d24ef4e9 | 1415 | static void |
c8407295 | 1416 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 1417 | { |
1418 | nsvc * vc = (nsvc *)data; | |
1419 | ||
c8407295 | 1420 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1421 | return; |
1422 | ||
c8407295 | 1423 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1424 | if (Comm::IsConnOpen(conn)) |
1425 | conn->close(); | |
d24ef4e9 | 1426 | return; |
1427 | } | |
1428 | ||
bd6a0c8f | 1429 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1430 | |
032785bf | 1431 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1432 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1433 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1434 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1435 | return; |
1436 | } | |
1437 | ||
dd3fb890 | 1438 | assert(vc->ns < nns); |
e0d28505 | 1439 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1440 | |
e210930b | 1441 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1442 | vc->msg->clean(); |
abd8f140 AJ |
1443 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1444 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1445 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1446 | } |
1447 | ||
1448 | static void | |
c8407295 | 1449 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
d24ef4e9 | 1450 | { |
1451 | nsvc * vc = (nsvc *)data; | |
1452 | ||
c8407295 | 1453 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1454 | return; |
1455 | ||
c8407295 | 1456 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1457 | if (Comm::IsConnOpen(conn)) |
1458 | conn->close(); | |
d24ef4e9 | 1459 | return; |
1460 | } | |
1461 | ||
1462 | vc->read_msglen += len; | |
1463 | ||
1464 | assert(vc->read_msglen <= 2); | |
1465 | ||
1466 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1467 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1468 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1469 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1470 | return; |
1471 | } | |
1472 | ||
1473 | vc->read_msglen = 0; | |
1474 | ||
1475 | vc->msglen = ntohs(vc->msglen); | |
1476 | ||
8185c30b SS |
1477 | if (!vc->msglen) { |
1478 | if (Comm::IsConnOpen(conn)) | |
1479 | conn->close(); | |
1480 | return; | |
1481 | } | |
1482 | ||
2fe7eff9 | 1483 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1484 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1485 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1486 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1487 | } |
1488 | ||
558be27a | 1489 | /* |
1490 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1491 | */ | |
1492 | static void | |
1493 | idnsRcodeCount(int rcode, int attempt) | |
1494 | { | |
1495 | if (rcode > 0) | |
62e76326 | 1496 | rcode = 0; |
558be27a | 1497 | else if (rcode < 0) |
62e76326 | 1498 | rcode = -rcode; |
1499 | ||
558be27a | 1500 | if (rcode < MAX_RCODE) |
62e76326 | 1501 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1502 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1503 | } |
1504 | ||
7b724b86 | 1505 | /* ====================================================================== */ |
1506 | ||
5f5e883f FC |
1507 | static void |
1508 | idnsRegisterWithCacheManager(void) | |
1509 | { | |
8822ebee | 1510 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1511 | } |
1512 | ||
7b724b86 | 1513 | void |
f64091a7 | 1514 | dnsInit(void) |
7b724b86 | 1515 | { |
1516 | static int init = 0; | |
62e76326 | 1517 | |
d24ef4e9 | 1518 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1519 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1520 | |
4d6c8504 | 1521 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1522 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1523 | |
4dd643d5 | 1524 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1525 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1526 | else |
049441d9 | 1527 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1528 | |
049441d9 | 1529 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1530 | addrV4.setIPv4(); |
7e07ced1 | 1531 | |
4dd643d5 | 1532 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1533 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1534 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1535 | IPPROTO_UDP, |
049441d9 | 1536 | addrV6, |
04f7fd38 | 1537 | COMM_NONBLOCKING, |
055421ee | 1538 | "DNS Socket IPv6"); |
7e07ced1 | 1539 | } |
4d6c8504 | 1540 | |
4dd643d5 | 1541 | if (addrV4.isIPv4()) { |
049441d9 | 1542 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1543 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1544 | IPPROTO_UDP, |
049441d9 | 1545 | addrV4, |
04f7fd38 | 1546 | COMM_NONBLOCKING, |
055421ee | 1547 | "DNS Socket IPv4"); |
7e07ced1 | 1548 | } |
62e76326 | 1549 | |
4d6c8504 | 1550 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1551 | fatal("Could not create a DNS socket"); |
1552 | ||
1553 | /* Ouch... we can't call functions using debug from a debug | |
1554 | * statement. Doing so messes up the internal Debug::level | |
1555 | */ | |
04f7fd38 | 1556 | if (DnsSocketB >= 0) { |
e91e2a72 | 1557 | comm_local_port(DnsSocketB); |
e0236918 | 1558 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1559 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1560 | } |
04f7fd38 | 1561 | if (DnsSocketA >= 0) { |
e91e2a72 | 1562 | comm_local_port(DnsSocketA); |
e0236918 | 1563 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1564 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1565 | } |
7b724b86 | 1566 | } |
62e76326 | 1567 | |
efd900cb | 1568 | assert(0 == nns); |
a079e38b AJ |
1569 | idnsAddMDNSNameservers(); |
1570 | bool nsFound = idnsParseNameservers(); | |
7aa9bb3e | 1571 | #if !_SQUID_WINDOWS_ |
62e76326 | 1572 | |
a079e38b AJ |
1573 | if (!nsFound) |
1574 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1575 | |
0e6d05ef | 1576 | #endif |
be266cb2 | 1577 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1578 | if (!nsFound) |
1579 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1580 | #endif |
62e76326 | 1581 | |
a079e38b | 1582 | if (!nsFound) { |
e0236918 | 1583 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1584 | #if _SQUID_WINDOWS_ |
e0236918 | 1585 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1586 | #else |
e0236918 | 1587 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1588 | #endif |
29fe9bd5 | 1589 | |
e0236918 | 1590 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1591 | if (Ip::EnableIpv6) |
1592 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1593 | idnsAddNameserver("127.0.0.1"); |
1594 | } | |
62e76326 | 1595 | |
7b724b86 | 1596 | if (!init) { |
62e76326 | 1597 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1598 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1599 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1600 | ++init; |
7b724b86 | 1601 | } |
372fb44e | 1602 | |
e210930b AJ |
1603 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1604 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1605 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1606 | max_shared_edns = -1; // disable if we might receive random replies. | |
1607 | } | |
1608 | #endif | |
1609 | ||
372fb44e | 1610 | idnsRegisterWithCacheManager(); |
7b724b86 | 1611 | } |
1612 | ||
1613 | void | |
f64091a7 | 1614 | dnsShutdown(void) |
7b724b86 | 1615 | { |
4d6c8504 | 1616 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1617 | return; |
1618 | ||
04f7fd38 | 1619 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1620 | comm_close(DnsSocketA); |
1621 | DnsSocketA = -1; | |
1622 | } | |
62e76326 | 1623 | |
055421ee | 1624 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1625 | comm_close(DnsSocketB); |
1626 | DnsSocketB = -1; | |
1627 | } | |
62e76326 | 1628 | |
95dc7ff4 | 1629 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1630 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1631 | if (Comm::IsConnOpen(vc->conn)) |
1632 | vc->conn->close(); | |
b26754c4 | 1633 | } |
1634 | } | |
1635 | ||
dd3fb890 | 1636 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1637 | idnsFreeNameservers(); |
68836b58 | 1638 | idnsFreeSearchpath(); |
7b724b86 | 1639 | } |
1640 | ||
3074b9d1 | 1641 | static int |
1642 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1643 | { | |
1644 | idns_query *q; | |
1645 | ||
1646 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1647 | ||
1648 | if (!old) | |
1649 | return 0; | |
1650 | ||
63a0e6b7 | 1651 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1652 | // idns_query is POD so no constructors are called after allocation |
1653 | q->xact_id.change(); | |
049441d9 | 1654 | // no query_id on this instance. |
3074b9d1 | 1655 | |
1656 | q->callback = callback; | |
1657 | ||
1658 | q->callback_data = cbdataReference(data); | |
1659 | ||
1660 | q->queue = old->queue; | |
1661 | ||
1662 | old->queue = q; | |
1663 | ||
1664 | return 1; | |
1665 | } | |
1666 | ||
1667 | static void | |
33ab4aaf | 1668 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1669 | { |
33ab4aaf HN |
1670 | q->start_t = current_time; |
1671 | q->callback = callback; | |
1672 | q->callback_data = cbdataReference(data); | |
1673 | ||
049441d9 | 1674 | q->hash.key = q->orig; |
3074b9d1 | 1675 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1676 | |
1677 | idnsSendQuery(q); | |
3074b9d1 | 1678 | } |
1679 | ||
049441d9 HN |
1680 | static void |
1681 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1682 | { | |
1683 | idns_query *q = cbdataAlloc(idns_query); | |
1684 | memcpy(q->name, master->name, sizeof(q->name)); | |
1685 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1686 | q->master = master; | |
1687 | q->query_id = idnsQueryID(); | |
1688 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1689 | q->start_t = master->start_t; |
049441d9 | 1690 | q->slave = master->slave; |
c7ba545e | 1691 | |
cafb131e | 1692 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1693 | ", id = 0x" << std::hex << q->query_id); |
1694 | if (!q->sz) { | |
1695 | cbdataFree(q); | |
1696 | return; | |
1697 | } | |
a079e38b | 1698 | idnsCheckMDNS(q); |
049441d9 HN |
1699 | master->slave = q; |
1700 | idnsSendQuery(q); | |
1701 | } | |
1702 | ||
7b724b86 | 1703 | void |
1704 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1705 | { | |
32f89713 NH |
1706 | size_t nameLength = strlen(name); |
1707 | ||
1708 | // Prevent buffer overflow on q->name | |
1709 | if (nameLength > NS_MAXDNAME) { | |
1710 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
1711 | callback(data, NULL, 0, "Internal error"); | |
1712 | return; | |
1713 | } | |
3074b9d1 | 1714 | |
1715 | if (idnsCachedLookup(name, callback, data)) | |
1716 | return; | |
1717 | ||
32f89713 | 1718 | idns_query *q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1719 | // idns_query is POD so no constructors are called after allocation |
1720 | q->xact_id.change(); | |
049441d9 | 1721 | q->query_id = idnsQueryID(); |
71952967 | 1722 | |
32f89713 NH |
1723 | int nd = 0; |
1724 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1725 | if (name[i] == '.') |
95dc7ff4 | 1726 | ++nd; |
68836b58 | 1727 | |
32f89713 | 1728 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1729 | q->do_searchpath = 1; |
1730 | } else { | |
1731 | q->do_searchpath = 0; | |
1732 | } | |
1733 | ||
1734 | strcpy(q->orig, name); | |
1735 | strcpy(q->name, q->orig); | |
1736 | ||
1737 | if (q->do_searchpath && nd < ndots) { | |
1738 | q->domain = 0; | |
1739 | strcat(q->name, "."); | |
1740 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1741 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1742 | } |
1743 | ||
049441d9 HN |
1744 | // see EDNS notes at top of file why this sends 0 |
1745 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1746 | |
2041330b | 1747 | if (q->sz < 0) { |
1748 | /* problem with query data -- query not sent */ | |
1749 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1750 | cbdataFree(q); |
2041330b | 1751 | return; |
1752 | } | |
1753 | ||
26ac0430 | 1754 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1755 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1756 | |
a079e38b | 1757 | idnsCheckMDNS(q); |
33ab4aaf | 1758 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1759 | |
1760 | if (Ip::EnableIpv6) | |
1761 | idnsSendSlaveAAAAQuery(q); | |
1762 | ||
7b724b86 | 1763 | } |
8db71107 | 1764 | |
1765 | void | |
b7ac5457 | 1766 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1767 | { |
3074b9d1 | 1768 | idns_query *q; |
1769 | ||
cc192b50 | 1770 | char ip[MAX_IPSTRLEN]; |
1771 | ||
4dd643d5 | 1772 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1773 | |
63a0e6b7 | 1774 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1775 | |
91dcbd43 CT |
1776 | // idns_query is POD so no constructors are called after allocation |
1777 | q->xact_id.change(); | |
049441d9 | 1778 | q->query_id = idnsQueryID(); |
71952967 | 1779 | |
4dd643d5 | 1780 | if (addr.isIPv6()) { |
cc192b50 | 1781 | struct in6_addr addr6; |
4dd643d5 | 1782 | addr.getInAddr(addr6); |
546ae352 | 1783 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1784 | } else { |
cc192b50 | 1785 | struct in_addr addr4; |
4dd643d5 | 1786 | addr.getInAddr(addr4); |
e210930b | 1787 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1788 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1789 | } |
1790 | ||
26ac0430 | 1791 | if (q->sz < 0) { |
2041330b | 1792 | /* problem with query data -- query not sent */ |
1793 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1794 | cbdataFree(q); |
2041330b | 1795 | return; |
1796 | } | |
1797 | ||
37f3da43 | 1798 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1799 | cbdataFree(q); |
1800 | return; | |
37f3da43 | 1801 | } |
1802 | ||
26ac0430 | 1803 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1804 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1805 | |
bce61b00 | 1806 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1807 | idnsStartQuery(q, callback, data); |
8db71107 | 1808 | } |
eb824054 | 1809 | |
59ad6d31 | 1810 | #if SQUID_SNMP |
3c573763 | 1811 | /* |
1812 | * The function to return the DNS via SNMP | |
1813 | */ | |
1814 | variable_list * | |
f64091a7 | 1815 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1816 | { |
1817 | int i, n = 0; | |
1818 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1819 | MemBuf tmp; |
1820 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1821 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1822 | |
3c573763 | 1823 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1824 | |
3c573763 | 1825 | case DNS_REQ: |
62e76326 | 1826 | |
95dc7ff4 | 1827 | for (i = 0; i < nns; ++i) |
62e76326 | 1828 | n += nameservers[i].nqueries; |
1829 | ||
1830 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1831 | n, | |
1832 | SMI_COUNTER32); | |
1833 | ||
1834 | break; | |
1835 | ||
3c573763 | 1836 | case DNS_REP: |
95dc7ff4 | 1837 | for (i = 0; i < nns; ++i) |
62e76326 | 1838 | n += nameservers[i].nreplies; |
1839 | ||
1840 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1841 | n, | |
1842 | SMI_COUNTER32); | |
1843 | ||
1844 | break; | |
1845 | ||
3c573763 | 1846 | case DNS_SERVERS: |
62e76326 | 1847 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1848 | nns, |
62e76326 | 1849 | SMI_COUNTER32); |
1850 | ||
1851 | break; | |
1852 | ||
3c573763 | 1853 | default: |
62e76326 | 1854 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1855 | ||
1856 | break; | |
3c573763 | 1857 | } |
62e76326 | 1858 | |
3c573763 | 1859 | return Answer; |
1860 | } | |
62e76326 | 1861 | |
3c573763 | 1862 | #endif /*SQUID_SNMP */ |