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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" |
0eb49b6d | 24 | #include "MemBuf.h" |
8822ebee | 25 | #include "mgr/Registration.h" |
582c2af2 | 26 | #include "rfc3596.h" |
4d5904f7 | 27 | #include "SquidConfig.h" |
582c2af2 FC |
28 | #include "SquidTime.h" |
29 | #include "Store.h" | |
8d03bdb4 | 30 | #include "tools.h" |
7176768b | 31 | #include "util.h" |
d295d770 | 32 | #include "wordlist.h" |
68836b58 | 33 | |
9c0a2256 FC |
34 | #if SQUID_SNMP |
35 | #include "snmp_core.h" | |
36 | #endif | |
37 | ||
68836b58 | 38 | #if HAVE_ARPA_NAMESER_H |
39 | #include <arpa/nameser.h> | |
40 | #endif | |
1a30fdf5 | 41 | #include <cerrno> |
68836b58 | 42 | #if HAVE_RESOLV_H |
43 | #include <resolv.h> | |
44 | #endif | |
45 | ||
be266cb2 | 46 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
47 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
48 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
49 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 50 | #endif |
68836b58 | 51 | #ifndef _PATH_RESCONF |
52 | #define _PATH_RESCONF "/etc/resolv.conf" | |
53 | #endif | |
54 | #ifndef NS_DEFAULTPORT | |
55 | #define NS_DEFAULTPORT 53 | |
56 | #endif | |
57 | ||
58 | #ifndef NS_MAXDNAME | |
59 | #define NS_MAXDNAME 1025 | |
60 | #endif | |
61 | ||
62 | #ifndef MAXDNSRCH | |
63 | #define MAXDNSRCH 6 | |
7b724b86 | 64 | #endif |
68836b58 | 65 | |
66 | /* The buffer size required to store the maximum allowed search path */ | |
67 | #ifndef RESOLV_BUFSZ | |
68 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 69 | #endif |
70 | ||
42b51993 | 71 | #define IDNS_MAX_TRIES 20 |
e210930b | 72 | #define MAX_RCODE 17 |
558be27a | 73 | #define MAX_ATTEMPT 3 |
74 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
75 | // NP: see http://www.iana.org/assignments/dns-parameters |
76 | static const char *Rcodes[] = { | |
24520b1b AJ |
77 | /* RFC 1035 */ |
78 | "Success", | |
79 | "Packet Format Error", | |
80 | "DNS Server Failure", | |
81 | "Non-Existent Domain", | |
82 | "Not Implemented", | |
83 | "Query Refused", | |
84 | /* RFC 2136 */ | |
85 | "Name Exists when it should not", | |
86 | "RR Set Exists when it should not", | |
87 | "RR Set that should exist does not", | |
88 | "Server Not Authoritative for zone", | |
89 | "Name not contained in zone", | |
90 | /* unassigned */ | |
91 | "","","","","", | |
92 | /* RFC 2671 */ | |
93 | "Bad OPT Version or TSIG Signature Failure" | |
94 | }; | |
558be27a | 95 | |
58a39dc9 | 96 | typedef struct _idns_query idns_query; |
62e76326 | 97 | |
7b724b86 | 98 | typedef struct _ns ns; |
58a39dc9 | 99 | |
68836b58 | 100 | typedef struct _sp sp; |
101 | ||
d24ef4e9 | 102 | typedef struct _nsvc nsvc; |
103 | ||
26ac0430 | 104 | struct _idns_query { |
3074b9d1 | 105 | hash_link hash; |
9e1f210d | 106 | rfc1035_query query; |
68836b58 | 107 | char buf[RESOLV_BUFSZ]; |
108 | char name[NS_MAXDNAME + 1]; | |
109 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 110 | ssize_t sz; |
049441d9 | 111 | unsigned short query_id; /// random query ID sent to server; changes with every query sent |
13b08e1c | 112 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried |
91dcbd43 | 113 | |
58a39dc9 | 114 | int nsends; |
d24ef4e9 | 115 | int need_vc; |
a079e38b | 116 | bool permit_mdns; |
049441d9 | 117 | int pending; |
62e76326 | 118 | |
58a39dc9 | 119 | struct timeval start_t; |
120 | struct timeval sent_t; | |
820ee9fa | 121 | struct timeval queue_t; |
58a39dc9 | 122 | dlink_node lru; |
123 | IDNSCB *callback; | |
124 | void *callback_data; | |
558be27a | 125 | int attempt; |
7ba8d0b8 | 126 | int rcode; |
3074b9d1 | 127 | idns_query *queue; |
0e6432d0 HN |
128 | idns_query *slave; // single linked list |
129 | idns_query *master; // single pointer to a shared master | |
68836b58 | 130 | unsigned short domain; |
131 | unsigned short do_searchpath; | |
049441d9 HN |
132 | rfc1035_message *message; |
133 | int ancount; | |
33ab4aaf | 134 | const char *error; |
58a39dc9 | 135 | }; |
91dcbd43 | 136 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 137 | |
26ac0430 | 138 | struct _nsvc { |
d24ef4e9 | 139 | int ns; |
00406b24 | 140 | Comm::ConnectionPointer conn; |
d24ef4e9 | 141 | unsigned short msglen; |
142 | int read_msglen; | |
032785bf | 143 | MemBuf *msg; |
144 | MemBuf *queue; | |
d24ef4e9 | 145 | bool busy; |
146 | }; | |
147 | ||
26ac0430 | 148 | struct _ns { |
b7ac5457 | 149 | Ip::Address S; |
7b724b86 | 150 | int nqueries; |
151 | int nreplies; | |
e210930b AJ |
152 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
153 | int last_seen_edns; | |
154 | #endif | |
a079e38b | 155 | bool mDNSResolver; |
d24ef4e9 | 156 | nsvc *vc; |
7b724b86 | 157 | }; |
58a39dc9 | 158 | |
26ac0430 | 159 | struct _sp { |
68836b58 | 160 | char domain[NS_MAXDNAME]; |
161 | int queries; | |
162 | }; | |
163 | ||
d24ef4e9 | 164 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 165 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 166 | |
7b724b86 | 167 | static ns *nameservers = NULL; |
68836b58 | 168 | static sp *searchpath = NULL; |
7b724b86 | 169 | static int nns = 0; |
170 | static int nns_alloc = 0; | |
51aee437 | 171 | static int nns_mdns_count = 0; |
68836b58 | 172 | static int npc = 0; |
173 | static int npc_alloc = 0; | |
174 | static int ndots = 1; | |
7b724b86 | 175 | static dlink_list lru_list; |
7cfc1c9a | 176 | static int event_queued = 0; |
3074b9d1 | 177 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 178 | |
e210930b AJ |
179 | /* |
180 | * Notes on EDNS: | |
181 | * | |
182 | * IPv4: | |
183 | * EDNS as specified may be sent as an additional record for any request. | |
184 | * early testing has revealed that it works on common devices, but cannot | |
185 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
186 | * | |
187 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
188 | * | |
189 | * Squid design: | |
190 | * Squid is optimized to generate one packet and re-send it to all NS | |
191 | * due to this we cannot customize the EDNS size per NS. | |
192 | * | |
193 | * As such we take the configuration option value as fixed. | |
194 | * | |
195 | * FUTURE TODO: | |
196 | * This may not be worth doing, but if/when additional-records are parsed | |
197 | * we will be able to recover the OPT value specific to any one NS and | |
198 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
199 | * size our active NS are capable. | |
200 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
201 | * Responses from the configured NS may cause this to be raised or turned off. | |
202 | */ | |
203 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
204 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
205 | #endif | |
206 | ||
7b724b86 | 207 | static OBJH idnsStats; |
208 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 209 | static void idnsAddMDNSNameservers(); |
68836b58 | 210 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 211 | static void idnsFreeNameservers(void); |
68836b58 | 212 | static void idnsFreeSearchpath(void); |
a079e38b | 213 | static bool idnsParseNameservers(void); |
a079e38b | 214 | static bool idnsParseResolvConf(void); |
be266cb2 | 215 | #if _SQUID_WINDOWS_ |
a079e38b | 216 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 217 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 218 | #endif |
33ab4aaf | 219 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 220 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 221 | static IOCB idnsReadVCHeader; |
e0d28505 | 222 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 223 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
224 | static IOCB idnsReadVC; |
225 | static IOCB idnsSentQueryVC; | |
62e76326 | 226 | |
b7ac5457 | 227 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 228 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 229 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 230 | static PF idnsRead; |
7cfc1c9a | 231 | static EVH idnsCheckQueue; |
efd900cb | 232 | static void idnsTickleQueue(void); |
558be27a | 233 | static void idnsRcodeCount(int, int); |
575d05c4 | 234 | static CLCB idnsVCClosed; |
91dcbd43 | 235 | static unsigned short idnsQueryID(void); |
049441d9 | 236 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 237 | |
a079e38b AJ |
238 | static void |
239 | idnsCheckMDNS(idns_query *q) | |
240 | { | |
bce61b00 AJ |
241 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
242 | return; | |
243 | ||
a079e38b AJ |
244 | size_t slen = strlen(q->name); |
245 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
246 | q->permit_mdns = true; | |
247 | } | |
248 | } | |
249 | ||
250 | static void | |
251 | idnsAddMDNSNameservers() | |
252 | { | |
51aee437 | 253 | nns_mdns_count=0; |
a079e38b | 254 | |
bce61b00 AJ |
255 | // mDNS is disabled |
256 | if (!Config.onoff.dns_mdns) | |
257 | return; | |
258 | ||
a079e38b | 259 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
260 | if (Ip::EnableIpv6) { |
261 | idnsAddNameserver("FF02::FB"); | |
262 | nameservers[nns-1].S.port(5353); | |
263 | nameservers[nns-1].mDNSResolver = true; | |
264 | ++nns_mdns_count; | |
265 | } | |
a079e38b AJ |
266 | |
267 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 268 | nameservers[nns-1].S.port(5353); |
a079e38b | 269 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
270 | |
271 | ++nns_mdns_count; | |
a079e38b AJ |
272 | } |
273 | ||
7b724b86 | 274 | static void |
275 | idnsAddNameserver(const char *buf) | |
276 | { | |
b7ac5457 | 277 | Ip::Address A; |
62e76326 | 278 | |
cc192b50 | 279 | if (!(A = buf)) { |
fa84c01d | 280 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 281 | return; |
d20b1cd0 | 282 | } |
62e76326 | 283 | |
4dd643d5 | 284 | if (A.isAnyAddr()) { |
fa84c01d | 285 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 286 | A.setLocalhost(); |
fa84c01d | 287 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 288 | } |
62e76326 | 289 | |
4dd643d5 | 290 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
291 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
292 | return; | |
5c5a349d | 293 | } |
62e76326 | 294 | |
7b724b86 | 295 | if (nns == nns_alloc) { |
62e76326 | 296 | int oldalloc = nns_alloc; |
297 | ns *oldptr = nameservers; | |
298 | ||
299 | if (nns_alloc == 0) | |
300 | nns_alloc = 2; | |
301 | else | |
302 | nns_alloc <<= 1; | |
303 | ||
304 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
305 | ||
306 | if (oldptr && oldalloc) | |
41d00cd3 | 307 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 308 | |
309 | if (oldptr) | |
310 | safe_free(oldptr); | |
7b724b86 | 311 | } |
62e76326 | 312 | |
7b724b86 | 313 | assert(nns < nns_alloc); |
4dd643d5 | 314 | A.port(NS_DEFAULTPORT); |
cc192b50 | 315 | nameservers[nns].S = A; |
e210930b AJ |
316 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
317 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
318 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
319 | #endif | |
cc192b50 | 320 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 321 | ++nns; |
7b724b86 | 322 | } |
323 | ||
68836b58 | 324 | static void |
325 | idnsAddPathComponent(const char *buf) | |
326 | { | |
327 | if (npc == npc_alloc) { | |
328 | int oldalloc = npc_alloc; | |
329 | sp *oldptr = searchpath; | |
330 | ||
331 | if (0 == npc_alloc) | |
332 | npc_alloc = 2; | |
333 | else | |
334 | npc_alloc <<= 1; | |
335 | ||
336 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
337 | ||
338 | if (oldptr && oldalloc) | |
41d00cd3 | 339 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 340 | |
341 | if (oldptr) | |
342 | safe_free(oldptr); | |
343 | } | |
344 | ||
345 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
346 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
347 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 348 | Tolower(searchpath[npc].domain); |
bf8fe701 | 349 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 350 | ++npc; |
68836b58 | 351 | } |
352 | ||
7b724b86 | 353 | static void |
354 | idnsFreeNameservers(void) | |
355 | { | |
356 | safe_free(nameservers); | |
357 | nns = nns_alloc = 0; | |
358 | } | |
359 | ||
68836b58 | 360 | static void |
361 | idnsFreeSearchpath(void) | |
362 | { | |
363 | safe_free(searchpath); | |
364 | npc = npc_alloc = 0; | |
365 | } | |
366 | ||
a079e38b | 367 | static bool |
efd900cb | 368 | idnsParseNameservers(void) |
369 | { | |
a079e38b AJ |
370 | bool result = false; |
371 | for (wordlist *w = Config.dns_nameservers; w; w = w->next) { | |
e0236918 | 372 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 373 | idnsAddNameserver(w->key); |
a079e38b | 374 | result = true; |
efd900cb | 375 | } |
a079e38b | 376 | return result; |
efd900cb | 377 | } |
378 | ||
a079e38b | 379 | static bool |
7b724b86 | 380 | idnsParseResolvConf(void) |
381 | { | |
a079e38b | 382 | bool result = false; |
aa0ca030 AJ |
383 | #if !_SQUID_WINDOWS_ || _SQUID_CYGWIN_ |
384 | FILE *fp = fopen(_PATH_RESCONF, "r"); | |
62e76326 | 385 | |
7b724b86 | 386 | if (fp == NULL) { |
e0236918 | 387 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
a079e38b | 388 | return false; |
7b724b86 | 389 | } |
62e76326 | 390 | |
be266cb2 | 391 | #if _SQUID_CYGWIN_ |
c4aefe96 | 392 | setmode(fileno(fp), O_TEXT); |
393 | #endif | |
62e76326 | 394 | |
aa0ca030 AJ |
395 | char buf[RESOLV_BUFSZ]; |
396 | const char *t = NULL; | |
68836b58 | 397 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 398 | t = strtok(buf, w_space); |
399 | ||
68836b58 | 400 | if (NULL == t) { |
62e76326 | 401 | continue; |
a37d6070 | 402 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 403 | t = strtok(NULL, w_space); |
62e76326 | 404 | |
68836b58 | 405 | if (NULL == t) |
406 | continue; | |
62e76326 | 407 | |
e0236918 | 408 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 409 | |
68836b58 | 410 | idnsAddNameserver(t); |
a079e38b | 411 | result = true; |
a37d6070 | 412 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
413 | idnsFreeSearchpath(); |
414 | t = strtok(NULL, w_space); | |
a083e75a | 415 | |
26ac0430 AJ |
416 | if (NULL == t) |
417 | continue; | |
a083e75a | 418 | |
e0236918 | 419 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 420 | |
26ac0430 | 421 | idnsAddPathComponent(t); |
a37d6070 | 422 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 423 | idnsFreeSearchpath(); |
68836b58 | 424 | while (NULL != t) { |
425 | t = strtok(NULL, w_space); | |
426 | ||
427 | if (NULL == t) | |
428 | continue; | |
429 | ||
e0236918 | 430 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 431 | |
432 | idnsAddPathComponent(t); | |
433 | } | |
a37d6070 | 434 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 435 | while (NULL != t) { |
436 | t = strtok(NULL, w_space); | |
62e76326 | 437 | |
68836b58 | 438 | if (NULL == t) |
439 | continue; | |
62e76326 | 440 | |
2c2da7d3 | 441 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 442 | ndots = atoi(t + 6); |
443 | ||
444 | if (ndots < 1) | |
445 | ndots = 1; | |
446 | ||
e0236918 | 447 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 448 | } |
449 | } | |
450 | } | |
7b724b86 | 451 | } |
a083e75a | 452 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
453 | t = strchr(t, '.'); |
454 | if (t) | |
455 | idnsAddPathComponent(t+1); | |
a083e75a | 456 | } |
62e76326 | 457 | |
7b724b86 | 458 | fclose(fp); |
aa0ca030 | 459 | #endif |
a079e38b | 460 | return result; |
7b724b86 | 461 | } |
462 | ||
be266cb2 | 463 | #if _SQUID_WINDOWS_ |
6b610e34 | 464 | static void |
d02b72b4 | 465 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 466 | { |
a16cb11f | 467 | char *t; |
6b610e34 | 468 | char *token; |
469 | HKEY hndKey; | |
470 | ||
0dde2160 | 471 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 472 | DWORD Type = 0; |
473 | DWORD Size = 0; | |
474 | LONG Result; | |
04f7fd38 | 475 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
476 | |
477 | if (Result == ERROR_SUCCESS && Size) { | |
478 | t = (char *) xmalloc(Size); | |
0dde2160 | 479 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 480 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
481 | idnsAddPathComponent(t); |
482 | xfree(t); | |
483 | } | |
04f7fd38 | 484 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 485 | |
486 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 487 | t = (char *) xmalloc(Size); |
04f7fd38 | 488 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 489 | token = strtok(t, Separator); |
6b610e34 | 490 | |
491 | while (token) { | |
492 | idnsAddPathComponent(token); | |
e0236918 | 493 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 494 | token = strtok(NULL, Separator); |
495 | } | |
26ac0430 | 496 | xfree(t); |
6b610e34 | 497 | } |
498 | ||
499 | RegCloseKey(hndKey); | |
500 | } | |
a6cae565 | 501 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
502 | t = strchr(t, '.'); |
503 | if (t) | |
504 | idnsAddPathComponent(t + 1); | |
a16cb11f | 505 | } |
6b610e34 | 506 | } |
507 | ||
a079e38b | 508 | static bool |
0e6d05ef | 509 | idnsParseWIN32Registry(void) |
510 | { | |
a16cb11f | 511 | char *t; |
0e6d05ef | 512 | char *token; |
513 | HKEY hndKey, hndKey2; | |
a079e38b | 514 | bool result = false; |
0e6d05ef | 515 | |
0e6d05ef | 516 | switch (WIN32_OS_version) { |
62e76326 | 517 | |
0e6d05ef | 518 | case _WIN_OS_WINNT: |
62e76326 | 519 | /* get nameservers from the Windows NT registry */ |
520 | ||
04f7fd38 | 521 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 522 | DWORD Type = 0; |
523 | DWORD Size = 0; | |
524 | LONG Result; | |
04f7fd38 | 525 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 526 | |
527 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 528 | t = (char *) xmalloc(Size); |
0dde2160 | 529 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 530 | token = strtok(t, ", "); |
62e76326 | 531 | |
532 | while (token) { | |
533 | idnsAddNameserver(token); | |
a079e38b | 534 | result = true; |
e0236918 | 535 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 536 | token = strtok(NULL, ","); |
62e76326 | 537 | } |
26ac0430 | 538 | xfree(t); |
62e76326 | 539 | } |
540 | ||
0dde2160 | 541 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 542 | |
543 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 544 | t = (char *) xmalloc(Size); |
a6cae565 | 545 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 546 | token = strtok(t, ", "); |
62e76326 | 547 | |
548 | while (token) { | |
e0236918 | 549 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 550 | idnsAddNameserver(token); |
a079e38b | 551 | result = true; |
62e76326 | 552 | token = strtok(NULL, ", "); |
553 | } | |
26ac0430 | 554 | xfree(t); |
62e76326 | 555 | } |
556 | ||
557 | RegCloseKey(hndKey); | |
558 | } | |
559 | ||
6b610e34 | 560 | idnsParseWIN32SearchList(" "); |
561 | ||
62e76326 | 562 | break; |
563 | ||
0e6d05ef | 564 | case _WIN_OS_WIN2K: |
62e76326 | 565 | |
b671cc68 | 566 | case _WIN_OS_WINXP: |
62e76326 | 567 | |
6b1846cf | 568 | case _WIN_OS_WINNET: |
28170269 | 569 | |
570 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
571 | |
572 | case _WIN_OS_WIN7: | |
62e76326 | 573 | /* get nameservers from the Windows 2000 registry */ |
574 | /* search all interfaces for DNS server addresses */ | |
575 | ||
04f7fd38 | 576 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 577 | int i; |
04f7fd38 AJ |
578 | DWORD MaxSubkeyLen, InterfacesCount; |
579 | char *keyname; | |
580 | FILETIME ftLastWriteTime; | |
581 | ||
582 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
583 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 584 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
585 | DWORD j; |
586 | j = MaxSubkeyLen; | |
587 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
588 | char *newkeyname; | |
589 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
590 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
591 | strcat(newkeyname, "\\"); | |
592 | strcat(newkeyname, keyname); | |
593 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
594 | DWORD Type = 0; | |
595 | DWORD Size = 0; | |
596 | LONG Result; | |
597 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
598 | if (Result == ERROR_SUCCESS && Size) { | |
599 | t = (char *) xmalloc(Size); | |
600 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
601 | token = strtok(t, ", "); | |
602 | while (token) { | |
e0236918 | 603 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 604 | idnsAddNameserver(token); |
a079e38b | 605 | result = true; |
04f7fd38 AJ |
606 | token = strtok(NULL, ", "); |
607 | } | |
608 | xfree(t); | |
609 | } | |
610 | ||
611 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
612 | if (Result == ERROR_SUCCESS && Size) { | |
613 | t = (char *) xmalloc(Size); | |
614 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
615 | token = strtok(t, ", "); | |
616 | while (token) { | |
e0236918 | 617 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 618 | idnsAddNameserver(token); |
a079e38b | 619 | result = true; |
04f7fd38 AJ |
620 | token = strtok(NULL, ", "); |
621 | } | |
622 | ||
623 | xfree(t); | |
62e76326 | 624 | } |
62e76326 | 625 | |
0dde2160 | 626 | RegCloseKey(hndKey2); |
62e76326 | 627 | } |
628 | ||
04f7fd38 | 629 | xfree(newkeyname); |
62e76326 | 630 | } |
631 | } | |
0dde2160 | 632 | |
04f7fd38 | 633 | xfree(keyname); |
62e76326 | 634 | } |
635 | ||
636 | RegCloseKey(hndKey); | |
637 | } | |
638 | ||
6b610e34 | 639 | idnsParseWIN32SearchList(", "); |
640 | ||
62e76326 | 641 | break; |
642 | ||
0e6d05ef | 643 | case _WIN_OS_WIN95: |
62e76326 | 644 | |
0e6d05ef | 645 | case _WIN_OS_WIN98: |
62e76326 | 646 | |
be20dac7 | 647 | case _WIN_OS_WINME: |
62e76326 | 648 | /* get nameservers from the Windows 9X registry */ |
649 | ||
04f7fd38 | 650 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 651 | DWORD Type = 0; |
652 | DWORD Size = 0; | |
653 | LONG Result; | |
04f7fd38 | 654 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 655 | |
656 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 657 | t = (char *) xmalloc(Size); |
a6cae565 | 658 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 659 | token = strtok(t, ", "); |
62e76326 | 660 | |
661 | while (token) { | |
e0236918 | 662 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 663 | idnsAddNameserver(token); |
a079e38b | 664 | result = true; |
62e76326 | 665 | token = strtok(NULL, ", "); |
666 | } | |
26ac0430 | 667 | xfree(t); |
62e76326 | 668 | } |
669 | ||
670 | RegCloseKey(hndKey); | |
671 | } | |
672 | ||
673 | break; | |
674 | ||
0e6d05ef | 675 | default: |
e0236918 | 676 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 677 | } |
a079e38b AJ |
678 | |
679 | return result; | |
0e6d05ef | 680 | } |
62e76326 | 681 | |
0e6d05ef | 682 | #endif |
683 | ||
7b724b86 | 684 | static void |
685 | idnsStats(StoreEntry * sentry) | |
686 | { | |
a16b4aa0 | 687 | dlink_node *n; |
688 | idns_query *q; | |
7cfc1c9a | 689 | int i; |
558be27a | 690 | int j; |
cc192b50 | 691 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 692 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 693 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 694 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
695 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
696 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 697 | |
a16b4aa0 | 698 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 699 | q = (idns_query *)n->data; |
bce61b00 | 700 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 701 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 702 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
703 | tvSubDsec(q->sent_t, current_time), |
704 | (q->permit_mdns? 'M':' '), | |
705 | q->name); | |
7cfc1c9a | 706 | } |
62e76326 | 707 | |
e210930b | 708 | if (Config.dns.packet_max > 0) |
bce61b00 | 709 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 710 | else |
bce61b00 | 711 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 712 | |
7cfc1c9a | 713 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
714 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
715 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 716 | |
95dc7ff4 | 717 | for (i = 0; i < nns; ++i) { |
a079e38b | 718 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 719 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 720 | nameservers[i].nqueries, |
a079e38b AJ |
721 | nameservers[i].nreplies, |
722 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 723 | } |
62e76326 | 724 | |
558be27a | 725 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
726 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 727 | |
95dc7ff4 | 728 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 729 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
730 | ||
e210930b | 731 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 732 | |
95dc7ff4 | 733 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
734 | if (j > 10 && j < 16) |
735 | continue; // unassigned by IANA. | |
736 | ||
62e76326 | 737 | storeAppendPrintf(sentry, "%5d", j); |
738 | ||
95dc7ff4 | 739 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 740 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
741 | ||
e210930b | 742 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 743 | } |
6b610e34 | 744 | |
745 | if (npc) { | |
746 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
747 | ||
95dc7ff4 | 748 | for (i=0; i < npc; ++i) |
6b610e34 | 749 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
750 | ||
751 | storeAppendPrintf(sentry, "\n"); | |
752 | } | |
7b724b86 | 753 | } |
754 | ||
efd900cb | 755 | static void |
756 | idnsTickleQueue(void) | |
757 | { | |
758 | if (event_queued) | |
62e76326 | 759 | return; |
760 | ||
efd900cb | 761 | if (NULL == lru_list.tail) |
62e76326 | 762 | return; |
763 | ||
fd0f51c4 CT |
764 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
765 | ||
766 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 767 | |
efd900cb | 768 | event_queued = 1; |
769 | } | |
770 | ||
d24ef4e9 | 771 | static void |
ced8def3 | 772 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag flag, int, void *data) |
d24ef4e9 | 773 | { |
774 | nsvc * vc = (nsvc *)data; | |
775 | ||
c8407295 | 776 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 777 | return; |
af6a12ee | 778 | |
e0d28505 AJ |
779 | // XXX: irrelevant now that we have conn pointer? |
780 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 781 | return; |
d24ef4e9 | 782 | |
c8407295 | 783 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 784 | conn->close(); |
d24ef4e9 | 785 | return; |
786 | } | |
787 | ||
788 | vc->busy = 0; | |
789 | idnsDoSendQueryVC(vc); | |
790 | } | |
791 | ||
792 | static void | |
793 | idnsDoSendQueryVC(nsvc *vc) | |
794 | { | |
795 | if (vc->busy) | |
796 | return; | |
797 | ||
032785bf | 798 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 799 | return; |
800 | ||
8401d6fc AR |
801 | // if retrying after a TC UDP response, our close handler cb may be pending |
802 | if (fd_table[vc->conn->fd].closing()) | |
803 | return; | |
804 | ||
032785bf | 805 | MemBuf *mb = vc->queue; |
d24ef4e9 | 806 | |
032785bf | 807 | vc->queue = new MemBuf; |
d24ef4e9 | 808 | |
809 | vc->busy = 1; | |
810 | ||
fd0f51c4 | 811 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
812 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
813 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 814 | AsyncCall::Pointer nil; |
d4b21972 | 815 | |
1b76e6c1 | 816 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 817 | |
ec41b64c AJ |
818 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
819 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 820 | Comm::Write(vc->conn, mb, call); |
032785bf | 821 | |
822 | delete mb; | |
d24ef4e9 | 823 | } |
824 | ||
825 | static void | |
ced8def3 | 826 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int, void *data) |
d24ef4e9 | 827 | { |
828 | nsvc * vc = (nsvc *)data; | |
829 | ||
c8407295 | 830 | if (status != Comm::OK || !conn) { |
dd3fb890 AR |
831 | char buf[MAX_IPSTRLEN] = ""; |
832 | if (vc->ns < nns) | |
4dd643d5 | 833 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 834 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 835 | return; |
836 | } | |
837 | ||
00406b24 | 838 | vc->conn = conn; |
cfd66529 AJ |
839 | |
840 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
841 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
842 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
843 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 844 | vc->busy = 0; |
845 | idnsDoSendQueryVC(vc); | |
846 | } | |
847 | ||
848 | static void | |
575d05c4 | 849 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 850 | { |
575d05c4 | 851 | nsvc * vc = (nsvc *)params.data; |
032785bf | 852 | delete vc->queue; |
853 | delete vc->msg; | |
00406b24 | 854 | vc->conn = NULL; |
f64091a7 | 855 | if (vc->ns < nns) // XXX: dnsShutdown may have freed nameservers[] |
dd3fb890 | 856 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 857 | cbdataFree(vc); |
d24ef4e9 | 858 | } |
859 | ||
860 | static void | |
9dca980d | 861 | idnsInitVC(int nsv) |
d24ef4e9 | 862 | { |
863 | nsvc *vc = cbdataAlloc(nsvc); | |
9dca980d | 864 | assert(nsv < nns); |
00406b24 | 865 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d AJ |
866 | nameservers[nsv].vc = vc; |
867 | vc->ns = nsv; | |
032785bf | 868 | vc->queue = new MemBuf; |
032785bf | 869 | vc->msg = new MemBuf; |
cfd66529 | 870 | vc->busy = 1; |
d24ef4e9 | 871 | |
00406b24 | 872 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 873 | |
4dd643d5 | 874 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 875 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 876 | else |
7fb5be3e | 877 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 878 | |
7fb5be3e | 879 | if (conn->remote.isIPv4()) |
4dd643d5 | 880 | conn->local.setIPv4(); |
f5ba22ff | 881 | |
cfd66529 | 882 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 883 | |
4accd6d8 | 884 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 885 | cs->setHost("DNS TCP Socket"); |
855150a4 | 886 | AsyncJob::Start(cs); |
d24ef4e9 | 887 | } |
888 | ||
889 | static void | |
9dca980d | 890 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 891 | { |
9dca980d AJ |
892 | assert(nsn < nns); |
893 | if (nameservers[nsn].vc == NULL) | |
894 | idnsInitVC(nsn); | |
d24ef4e9 | 895 | |
9dca980d | 896 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 897 | |
445962f3 HN |
898 | if (!vc) { |
899 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 900 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
901 | |
902 | return; | |
903 | } | |
904 | ||
2fe7eff9 | 905 | vc->queue->reset(); |
d24ef4e9 | 906 | |
907 | short head = htons(q->sz); | |
908 | ||
2fe7eff9 | 909 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 910 | |
2fe7eff9 | 911 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 912 | |
913 | idnsDoSendQueryVC(vc); | |
914 | } | |
915 | ||
7b724b86 | 916 | static void |
917 | idnsSendQuery(idns_query * q) | |
918 | { | |
4d6c8504 | 919 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 920 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 921 | return; |
0a69973e | 922 | } |
62e76326 | 923 | |
cc192b50 | 924 | if (nns <= 0) { |
e0236918 | 925 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 926 | return; |
927 | } | |
62e76326 | 928 | |
7b724b86 | 929 | assert(q->lru.next == NULL); |
62e76326 | 930 | |
7b724b86 | 931 | assert(q->lru.prev == NULL); |
62e76326 | 932 | |
4d6c8504 | 933 | int x = -1, y = -1; |
9dca980d | 934 | int nsn; |
4d6c8504 | 935 | |
213b6c90 | 936 | do { |
a079e38b AJ |
937 | // only use mDNS resolvers for mDNS compatible queries |
938 | if (!q->permit_mdns) | |
51aee437 | 939 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
940 | else |
941 | nsn = q->nsends % nns; | |
213b6c90 AJ |
942 | |
943 | if (q->need_vc) { | |
9dca980d | 944 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 945 | x = y = 0; |
213b6c90 | 946 | } else { |
4dd643d5 | 947 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 948 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 949 | else if (DnsSocketA >= 0) |
9dca980d | 950 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 951 | } |
62e76326 | 952 | |
95dc7ff4 | 953 | ++ q->nsends; |
62e76326 | 954 | |
33ab4aaf | 955 | q->sent_t = current_time; |
62e76326 | 956 | |
4dd643d5 | 957 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
e0236918 | 958 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4dd643d5 | 959 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
e0236918 | 960 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
961 | |
962 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 963 | |
bd6a0c8f | 964 | if (y > 0) { |
4d6c8504 | 965 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 966 | } |
bd6a0c8f | 967 | if (x > 0) { |
4d6c8504 | 968 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 969 | } |
62e76326 | 970 | |
9dca980d | 971 | ++ nameservers[nsn].nqueries; |
c131f066 | 972 | q->queue_t = current_time; |
7b724b86 | 973 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 974 | q->pending = 1; |
efd900cb | 975 | idnsTickleQueue(); |
7b724b86 | 976 | } |
977 | ||
978 | static int | |
b7ac5457 | 979 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 980 | { |
981 | int i; | |
62e76326 | 982 | |
95dc7ff4 | 983 | for (i = 0; i < nns; ++i) { |
cc192b50 | 984 | if (nameservers[i].S != from) |
62e76326 | 985 | continue; |
986 | ||
4dd643d5 | 987 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 988 | continue; |
989 | ||
990 | return i; | |
7b724b86 | 991 | } |
62e76326 | 992 | |
7cfc1c9a | 993 | return -1; |
7b724b86 | 994 | } |
995 | ||
996 | static idns_query * | |
997 | idnsFindQuery(unsigned short id) | |
998 | { | |
999 | dlink_node *n; | |
1000 | idns_query *q; | |
62e76326 | 1001 | |
7b724b86 | 1002 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1003 | q = (idns_query*)n->data; |
1004 | ||
049441d9 | 1005 | if (q->query_id == id) |
62e76326 | 1006 | return q; |
7b724b86 | 1007 | } |
62e76326 | 1008 | |
7b724b86 | 1009 | return NULL; |
1010 | } | |
1011 | ||
108d67a0 | 1012 | static unsigned short |
1013 | idnsQueryID(void) | |
1014 | { | |
1015 | unsigned short id = squid_random() & 0xFFFF; | |
1016 | unsigned short first_id = id; | |
1017 | ||
26ac0430 | 1018 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1019 | ++id; |
108d67a0 | 1020 | |
846c8960 | 1021 | if (id == first_id) { |
e0236918 | 1022 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1023 | break; |
846c8960 | 1024 | } |
108d67a0 | 1025 | } |
1026 | ||
846c8960 | 1027 | return id; |
108d67a0 | 1028 | } |
1029 | ||
3074b9d1 | 1030 | static void |
33ab4aaf | 1031 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1032 | { |
1033 | IDNSCB *callback; | |
1034 | void *cbdata; | |
1035 | ||
33ab4aaf HN |
1036 | if (error) |
1037 | q->error = error; | |
1038 | ||
1039 | if (q->master) | |
1040 | q = q->master; | |
1041 | ||
33ab4aaf | 1042 | // If any of our subqueries are still pending then wait for them to complete before continuing |
9dca980d | 1043 | for (idns_query *q2 = q; q2; q2 = q2->slave) { |
33ab4aaf HN |
1044 | if (q2->pending) { |
1045 | return; | |
1046 | } | |
1047 | } | |
1048 | ||
1049 | /* Merge results */ | |
1050 | rfc1035_message *message = q->message; | |
1051 | q->message = NULL; | |
1052 | int n = q->ancount; | |
1053 | error = q->error; | |
1054 | ||
9dca980d | 1055 | while ( idns_query *q2 = q->slave ) { |
33ab4aaf HN |
1056 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); |
1057 | q->slave = q2->slave; | |
1058 | if ( !q2->error ) { | |
1059 | if (n > 0) { | |
1060 | // two sets of RR need merging | |
1061 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1062 | if (Config.dns.v4_first) { | |
1063 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1064 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1065 | } else { | |
1066 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1067 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1068 | } | |
1069 | n += q2->ancount; | |
1070 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1071 | // result, do not free them here | |
1072 | safe_free(message->answer); | |
1073 | safe_free(q2->message->answer); | |
1074 | message->answer = result; | |
1075 | message->ancount += q2->message->ancount; | |
1076 | } else { | |
1077 | // first response empty or failed, just use the second | |
1078 | rfc1035MessageDestroy(&message); | |
1079 | message = q2->message; | |
1080 | q2->message = NULL; | |
1081 | n = q2->ancount; | |
1082 | error = NULL; | |
1083 | } | |
1084 | } | |
1085 | rfc1035MessageDestroy(&q2->message); | |
1086 | cbdataFree(q2); | |
1087 | } | |
1088 | ||
1089 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1090 | ||
3074b9d1 | 1091 | callback = q->callback; |
1092 | q->callback = NULL; | |
33ab4aaf | 1093 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1094 | |
1095 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1096 | callback(cbdata, answers, n, error); | |
1097 | ||
26ac0430 | 1098 | while (q->queue) { |
3074b9d1 | 1099 | idns_query *q2 = q->queue; |
1100 | q->queue = q2->queue; | |
1101 | callback = q2->callback; | |
1102 | q2->callback = NULL; | |
1103 | ||
1104 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1105 | callback(cbdata, answers, n, error); | |
1106 | ||
63a0e6b7 | 1107 | cbdataFree(q2); |
3074b9d1 | 1108 | } |
1109 | ||
1110 | if (q->hash.key) { | |
1111 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1112 | q->hash.key = NULL; | |
1113 | } | |
33ab4aaf HN |
1114 | |
1115 | rfc1035MessageDestroy(&message); | |
1116 | cbdataFree(q); | |
3074b9d1 | 1117 | } |
1118 | ||
7b724b86 | 1119 | static void |
ced8def3 | 1120 | idnsGrokReply(const char *buf, size_t sz, int /*from_ns*/) |
7b724b86 | 1121 | { |
1122 | int n; | |
ec7bade0 | 1123 | rfc1035_message *message = NULL; |
7b724b86 | 1124 | idns_query *q; |
3074b9d1 | 1125 | |
cc192b50 | 1126 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1127 | |
ec7bade0 | 1128 | if (message == NULL) { |
e0236918 | 1129 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1130 | return; |
7b724b86 | 1131 | } |
62e76326 | 1132 | |
91dcbd43 | 1133 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1134 | |
1135 | q = idnsFindQuery(message->id); | |
1136 | ||
7b724b86 | 1137 | if (q == NULL) { |
bf8fe701 | 1138 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1139 | rfc1035MessageDestroy(&message); |
62e76326 | 1140 | return; |
7b724b86 | 1141 | } |
62e76326 | 1142 | |
9e1f210d | 1143 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1144 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1145 | rfc1035MessageDestroy(&message); |
9e1f210d | 1146 | return; |
1147 | } | |
1148 | ||
e210930b AJ |
1149 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1150 | // TODO: actually gr the message right here. | |
f53969cc SM |
1151 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q |
1152 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1153 | // AND allows us to merge AN+AR sections from both responses (one day) | |
e210930b AJ |
1154 | |
1155 | if (q->edns_seen >= 0) { | |
1156 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1157 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1158 | // the altered NS was limiting the whole group. | |
1159 | max_shared_edns = q->edns_seen; | |
1160 | // may be limited by one of the others still | |
95dc7ff4 | 1161 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1162 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1163 | } else { | |
1164 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1165 | // maybe reduce the global limit downwards to accomodate this NS | |
1166 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1167 | } | |
1168 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1169 | max_shared_edns = -1; | |
1170 | } | |
1171 | #endif | |
1172 | ||
049441d9 HN |
1173 | dlinkDelete(&q->lru, &lru_list); |
1174 | q->pending = 0; | |
1175 | ||
d24ef4e9 | 1176 | if (message->tc) { |
bae9832d | 1177 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1178 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1179 | |
1180 | if (!q->need_vc) { | |
1181 | q->need_vc = 1; | |
5e263176 | 1182 | -- q->nsends; |
d24ef4e9 | 1183 | idnsSendQuery(q); |
91dcbd43 CT |
1184 | } else { |
1185 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1186 | // Return an error and cleanup; no point in trying TCP again. | |
1187 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1188 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1189 | } |
1190 | ||
1191 | return; | |
1192 | } | |
9e1f210d | 1193 | |
558be27a | 1194 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1195 | |
558be27a | 1196 | if (n < 0) { |
7ba8d0b8 | 1197 | q->rcode = -n; |
42687bb2 | 1198 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1199 | |
95dc7ff4 | 1200 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1201 | /* |
1202 | * RCODE 2 is "Server failure - The name server was | |
1203 | * unable to process this query due to a problem with | |
1204 | * the name server." | |
1205 | */ | |
cc192b50 | 1206 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1207 | rfc1035MessageDestroy(&message); | |
62e76326 | 1208 | idnsSendQuery(q); |
1209 | return; | |
1210 | } | |
68836b58 | 1211 | |
0e6432d0 HN |
1212 | // Do searchpath processing on the master A query only to keep |
1213 | // things simple. NXDOMAIN is authorative for the label, not | |
1214 | // the record type. | |
049441d9 | 1215 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1216 | assert(NULL == message->answer); |
1217 | strcpy(q->name, q->orig); | |
1218 | ||
cc192b50 | 1219 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1220 | ||
68836b58 | 1221 | if (q->domain < npc) { |
1222 | strcat(q->name, "."); | |
1223 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1224 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1225 | ++ q->domain; |
68836b58 | 1226 | } else { |
95dc7ff4 | 1227 | ++ q->attempt; |
68836b58 | 1228 | } |
1229 | ||
049441d9 | 1230 | rfc1035MessageDestroy(&message); |
cc192b50 | 1231 | |
33ab4aaf | 1232 | // cleanup slave AAAA query |
049441d9 HN |
1233 | while (idns_query *slave = q->slave) { |
1234 | dlinkDelete(&slave->lru, &lru_list); | |
1235 | q->slave = slave->slave; | |
1236 | rfc1035MessageDestroy(&slave->message); | |
1237 | cbdataFree(slave); | |
cc192b50 | 1238 | } |
c7ba545e | 1239 | |
049441d9 HN |
1240 | // Build new query |
1241 | q->query_id = idnsQueryID(); | |
1242 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1243 | // see EDNS notes at top of file why this sends 0 | |
1244 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1245 | if (q->sz < 0) { |
1246 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1247 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1248 | return; |
1249 | } | |
1250 | ||
33ab4aaf HN |
1251 | q->nsends = 0; |
1252 | ||
a079e38b | 1253 | idnsCheckMDNS(q); |
68836b58 | 1254 | idnsSendQuery(q); |
049441d9 HN |
1255 | if (Ip::EnableIpv6) |
1256 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1257 | return; |
1258 | } | |
558be27a | 1259 | } |
62e76326 | 1260 | |
049441d9 HN |
1261 | q->message = message; |
1262 | q->ancount = n; | |
cc192b50 | 1263 | |
33ab4aaf HN |
1264 | if (n >= 0) |
1265 | idnsCallback(q, NULL); | |
1266 | else | |
1267 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1268 | |
7b724b86 | 1269 | } |
1270 | ||
1271 | static void | |
ced8def3 | 1272 | idnsRead(int fd, void *) |
7b724b86 | 1273 | { |
d193a436 | 1274 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1275 | int len; |
42b51993 | 1276 | int max = INCOMING_DNS_MAX; |
d29b40de | 1277 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1278 | Ip::Address from; |
cc192b50 | 1279 | |
d7e7eaa7 | 1280 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1281 | |
bd6a0c8f HN |
1282 | // Always keep reading. This stops (or at least makes harder) several |
1283 | // attacks on the DNS client. | |
d841c88d | 1284 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1285 | |
cc192b50 | 1286 | /* BUG (UNRESOLVED) |
1287 | * two code lines after returning from comm_udprecvfrom() | |
1288 | * something overwrites the memory behind the from parameter. | |
1289 | * NO matter where in the stack declaration list above it is placed | |
1290 | * The cause of this is still unknown, however copying the data appears | |
1291 | * to allow it to be passed further without this erasure. | |
1292 | */ | |
b7ac5457 | 1293 | Ip::Address bugbypass; |
62e76326 | 1294 | |
5e263176 FC |
1295 | while (max) { |
1296 | --max; | |
cc192b50 | 1297 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1298 | |
cc192b50 | 1299 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1300 | |
1301 | if (len == 0) | |
1302 | break; | |
1303 | ||
1304 | if (len < 0) { | |
1305 | if (ignoreErrno(errno)) | |
1306 | break; | |
1307 | ||
1191b93b | 1308 | #if _SQUID_LINUX_ |
62e76326 | 1309 | /* Some Linux systems seem to set the FD for reading and then |
1310 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1311 | * port unreachable message. */ | |
1312 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1313 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1314 | #endif |
62e76326 | 1315 | |
e0236918 | 1316 | debugs(50, DBG_IMPORTANT, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1317 | |
1318 | break; | |
1319 | } | |
1320 | ||
055421ee | 1321 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1322 | |
62e76326 | 1323 | assert(N); |
aec55359 | 1324 | ++(*N); |
cc192b50 | 1325 | |
1326 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1327 | ||
1328 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1329 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1330 | |
9dca980d AJ |
1331 | if (nsn >= 0) { |
1332 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1333 | } |
1334 | ||
1335 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1336 | // but after the ++ above to keep statistics right. | |
1337 | if (!lru_list.head) | |
1338 | continue; // Don't process replies if there is no pending query. | |
1339 | ||
9dca980d | 1340 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1341 | static time_t last_warning = 0; |
1342 | ||
1343 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1344 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1345 | last_warning = squid_curtime; |
26ac0430 | 1346 | } else { |
e0236918 | 1347 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1348 | } |
1349 | continue; | |
62e76326 | 1350 | } |
1351 | ||
9dca980d | 1352 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1353 | } |
1354 | } | |
1355 | ||
7cfc1c9a | 1356 | static void |
ced8def3 | 1357 | idnsCheckQueue(void *) |
7cfc1c9a | 1358 | { |
1359 | dlink_node *n; | |
0c4fe9e4 | 1360 | dlink_node *p = NULL; |
7cfc1c9a | 1361 | idns_query *q; |
1362 | event_queued = 0; | |
62e76326 | 1363 | |
820ee9fa AJ |
1364 | if (0 == nns) |
1365 | /* name servers went away; reconfiguring or shutting down */ | |
1366 | return; | |
1367 | ||
0c4fe9e4 | 1368 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1369 | |
820ee9fa | 1370 | p = n->prev; |
733cedc0 | 1371 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1372 | |
820ee9fa | 1373 | /* Anything to process in the queue? */ |
fd0f51c4 | 1374 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1375 | break; |
62e76326 | 1376 | |
33ab4aaf | 1377 | /* Query timer still running? */ |
fd0f51c4 | 1378 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1379 | dlinkDelete(&q->lru, &lru_list); |
1380 | q->queue_t = current_time; | |
1381 | dlinkAdd(q, &q->lru, &lru_list); | |
1382 | continue; | |
1383 | } | |
62e76326 | 1384 | |
91dcbd43 CT |
1385 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1386 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1387 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1388 | |
1389 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1390 | q->pending = 0; |
62e76326 | 1391 | |
fd0f51c4 | 1392 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1393 | idnsSendQuery(q); |
1394 | } else { | |
91dcbd43 | 1395 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1396 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1397 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1398 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1399 | |
1400 | if (q->rcode != 0) | |
33ab4aaf | 1401 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1402 | else |
33ab4aaf | 1403 | idnsCallback(q, "Timeout"); |
62e76326 | 1404 | } |
7cfc1c9a | 1405 | } |
62e76326 | 1406 | |
efd900cb | 1407 | idnsTickleQueue(); |
7cfc1c9a | 1408 | } |
1409 | ||
d24ef4e9 | 1410 | static void |
ced8def3 | 1411 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1412 | { |
1413 | nsvc * vc = (nsvc *)data; | |
1414 | ||
c8407295 | 1415 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1416 | return; |
1417 | ||
c8407295 | 1418 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1419 | if (Comm::IsConnOpen(conn)) |
1420 | conn->close(); | |
d24ef4e9 | 1421 | return; |
1422 | } | |
1423 | ||
bd6a0c8f | 1424 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1425 | |
032785bf | 1426 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1427 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1428 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1429 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1430 | return; |
1431 | } | |
1432 | ||
dd3fb890 | 1433 | assert(vc->ns < nns); |
e0d28505 | 1434 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1435 | |
e210930b | 1436 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1437 | vc->msg->clean(); |
abd8f140 AJ |
1438 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1439 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1440 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1441 | } |
1442 | ||
1443 | static void | |
ced8def3 | 1444 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1445 | { |
1446 | nsvc * vc = (nsvc *)data; | |
1447 | ||
c8407295 | 1448 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1449 | return; |
1450 | ||
c8407295 | 1451 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1452 | if (Comm::IsConnOpen(conn)) |
1453 | conn->close(); | |
d24ef4e9 | 1454 | return; |
1455 | } | |
1456 | ||
1457 | vc->read_msglen += len; | |
1458 | ||
1459 | assert(vc->read_msglen <= 2); | |
1460 | ||
1461 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1462 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1463 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1464 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1465 | return; |
1466 | } | |
1467 | ||
1468 | vc->read_msglen = 0; | |
1469 | ||
1470 | vc->msglen = ntohs(vc->msglen); | |
1471 | ||
8185c30b SS |
1472 | if (!vc->msglen) { |
1473 | if (Comm::IsConnOpen(conn)) | |
1474 | conn->close(); | |
1475 | return; | |
1476 | } | |
1477 | ||
2fe7eff9 | 1478 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1479 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1480 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1481 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1482 | } |
1483 | ||
558be27a | 1484 | /* |
1485 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1486 | */ | |
1487 | static void | |
1488 | idnsRcodeCount(int rcode, int attempt) | |
1489 | { | |
1490 | if (rcode > 0) | |
62e76326 | 1491 | rcode = 0; |
558be27a | 1492 | else if (rcode < 0) |
62e76326 | 1493 | rcode = -rcode; |
1494 | ||
558be27a | 1495 | if (rcode < MAX_RCODE) |
62e76326 | 1496 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1497 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1498 | } |
1499 | ||
7b724b86 | 1500 | /* ====================================================================== */ |
1501 | ||
5f5e883f FC |
1502 | static void |
1503 | idnsRegisterWithCacheManager(void) | |
1504 | { | |
8822ebee | 1505 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1506 | } |
1507 | ||
7b724b86 | 1508 | void |
f64091a7 | 1509 | dnsInit(void) |
7b724b86 | 1510 | { |
1511 | static int init = 0; | |
62e76326 | 1512 | |
d24ef4e9 | 1513 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1514 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1515 | |
4d6c8504 | 1516 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1517 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1518 | |
4dd643d5 | 1519 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1520 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1521 | else |
049441d9 | 1522 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1523 | |
049441d9 | 1524 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1525 | addrV4.setIPv4(); |
7e07ced1 | 1526 | |
4dd643d5 | 1527 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1528 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1529 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1530 | IPPROTO_UDP, |
049441d9 | 1531 | addrV6, |
04f7fd38 | 1532 | COMM_NONBLOCKING, |
055421ee | 1533 | "DNS Socket IPv6"); |
7e07ced1 | 1534 | } |
4d6c8504 | 1535 | |
4dd643d5 | 1536 | if (addrV4.isIPv4()) { |
049441d9 | 1537 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1538 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1539 | IPPROTO_UDP, |
049441d9 | 1540 | addrV4, |
04f7fd38 | 1541 | COMM_NONBLOCKING, |
055421ee | 1542 | "DNS Socket IPv4"); |
7e07ced1 | 1543 | } |
62e76326 | 1544 | |
4d6c8504 | 1545 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1546 | fatal("Could not create a DNS socket"); |
1547 | ||
1548 | /* Ouch... we can't call functions using debug from a debug | |
1549 | * statement. Doing so messes up the internal Debug::level | |
1550 | */ | |
04f7fd38 | 1551 | if (DnsSocketB >= 0) { |
e91e2a72 | 1552 | comm_local_port(DnsSocketB); |
e0236918 | 1553 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1554 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1555 | } |
04f7fd38 | 1556 | if (DnsSocketA >= 0) { |
e91e2a72 | 1557 | comm_local_port(DnsSocketA); |
e0236918 | 1558 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1559 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1560 | } |
7b724b86 | 1561 | } |
62e76326 | 1562 | |
efd900cb | 1563 | assert(0 == nns); |
a079e38b AJ |
1564 | idnsAddMDNSNameservers(); |
1565 | bool nsFound = idnsParseNameservers(); | |
62e76326 | 1566 | |
a079e38b AJ |
1567 | if (!nsFound) |
1568 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1569 | |
be266cb2 | 1570 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1571 | if (!nsFound) |
1572 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1573 | #endif |
62e76326 | 1574 | |
a079e38b | 1575 | if (!nsFound) { |
e0236918 | 1576 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1577 | #if _SQUID_WINDOWS_ |
e0236918 | 1578 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1579 | #else |
e0236918 | 1580 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1581 | #endif |
29fe9bd5 | 1582 | |
e0236918 | 1583 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1584 | if (Ip::EnableIpv6) |
1585 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1586 | idnsAddNameserver("127.0.0.1"); |
1587 | } | |
62e76326 | 1588 | |
7b724b86 | 1589 | if (!init) { |
62e76326 | 1590 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1591 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1592 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1593 | ++init; |
7b724b86 | 1594 | } |
372fb44e | 1595 | |
e210930b AJ |
1596 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1597 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1598 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1599 | max_shared_edns = -1; // disable if we might receive random replies. | |
1600 | } | |
1601 | #endif | |
1602 | ||
372fb44e | 1603 | idnsRegisterWithCacheManager(); |
7b724b86 | 1604 | } |
1605 | ||
1606 | void | |
f64091a7 | 1607 | dnsShutdown(void) |
7b724b86 | 1608 | { |
4d6c8504 | 1609 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1610 | return; |
1611 | ||
04f7fd38 | 1612 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1613 | comm_close(DnsSocketA); |
1614 | DnsSocketA = -1; | |
1615 | } | |
62e76326 | 1616 | |
055421ee | 1617 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1618 | comm_close(DnsSocketB); |
1619 | DnsSocketB = -1; | |
1620 | } | |
62e76326 | 1621 | |
95dc7ff4 | 1622 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1623 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1624 | if (Comm::IsConnOpen(vc->conn)) |
1625 | vc->conn->close(); | |
b26754c4 | 1626 | } |
1627 | } | |
1628 | ||
dd3fb890 | 1629 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1630 | idnsFreeNameservers(); |
68836b58 | 1631 | idnsFreeSearchpath(); |
7b724b86 | 1632 | } |
1633 | ||
3074b9d1 | 1634 | static int |
1635 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1636 | { | |
1637 | idns_query *q; | |
1638 | ||
1639 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1640 | ||
1641 | if (!old) | |
1642 | return 0; | |
1643 | ||
63a0e6b7 | 1644 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1645 | // idns_query is POD so no constructors are called after allocation |
1646 | q->xact_id.change(); | |
049441d9 | 1647 | // no query_id on this instance. |
3074b9d1 | 1648 | |
1649 | q->callback = callback; | |
1650 | ||
1651 | q->callback_data = cbdataReference(data); | |
1652 | ||
1653 | q->queue = old->queue; | |
1654 | ||
1655 | old->queue = q; | |
1656 | ||
1657 | return 1; | |
1658 | } | |
1659 | ||
1660 | static void | |
33ab4aaf | 1661 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1662 | { |
33ab4aaf HN |
1663 | q->start_t = current_time; |
1664 | q->callback = callback; | |
1665 | q->callback_data = cbdataReference(data); | |
1666 | ||
049441d9 | 1667 | q->hash.key = q->orig; |
3074b9d1 | 1668 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1669 | |
1670 | idnsSendQuery(q); | |
3074b9d1 | 1671 | } |
1672 | ||
049441d9 HN |
1673 | static void |
1674 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1675 | { | |
1676 | idns_query *q = cbdataAlloc(idns_query); | |
1677 | memcpy(q->name, master->name, sizeof(q->name)); | |
1678 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1679 | q->master = master; | |
1680 | q->query_id = idnsQueryID(); | |
1681 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1682 | q->start_t = master->start_t; |
049441d9 | 1683 | q->slave = master->slave; |
c7ba545e | 1684 | |
cafb131e | 1685 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1686 | ", id = 0x" << std::hex << q->query_id); |
1687 | if (!q->sz) { | |
1688 | cbdataFree(q); | |
1689 | return; | |
1690 | } | |
a079e38b | 1691 | idnsCheckMDNS(q); |
049441d9 HN |
1692 | master->slave = q; |
1693 | idnsSendQuery(q); | |
1694 | } | |
1695 | ||
7b724b86 | 1696 | void |
1697 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1698 | { | |
32f89713 NH |
1699 | size_t nameLength = strlen(name); |
1700 | ||
1701 | // Prevent buffer overflow on q->name | |
1702 | if (nameLength > NS_MAXDNAME) { | |
1703 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
1704 | callback(data, NULL, 0, "Internal error"); | |
1705 | return; | |
1706 | } | |
3074b9d1 | 1707 | |
1708 | if (idnsCachedLookup(name, callback, data)) | |
1709 | return; | |
1710 | ||
32f89713 | 1711 | idns_query *q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1712 | // idns_query is POD so no constructors are called after allocation |
1713 | q->xact_id.change(); | |
049441d9 | 1714 | q->query_id = idnsQueryID(); |
71952967 | 1715 | |
32f89713 NH |
1716 | int nd = 0; |
1717 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1718 | if (name[i] == '.') |
95dc7ff4 | 1719 | ++nd; |
68836b58 | 1720 | |
32f89713 | 1721 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1722 | q->do_searchpath = 1; |
1723 | } else { | |
1724 | q->do_searchpath = 0; | |
1725 | } | |
1726 | ||
1727 | strcpy(q->orig, name); | |
1728 | strcpy(q->name, q->orig); | |
1729 | ||
1730 | if (q->do_searchpath && nd < ndots) { | |
1731 | q->domain = 0; | |
1732 | strcat(q->name, "."); | |
1733 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1734 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1735 | } |
1736 | ||
049441d9 HN |
1737 | // see EDNS notes at top of file why this sends 0 |
1738 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1739 | |
2041330b | 1740 | if (q->sz < 0) { |
1741 | /* problem with query data -- query not sent */ | |
1742 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1743 | cbdataFree(q); |
2041330b | 1744 | return; |
1745 | } | |
1746 | ||
26ac0430 | 1747 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1748 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1749 | |
a079e38b | 1750 | idnsCheckMDNS(q); |
33ab4aaf | 1751 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1752 | |
1753 | if (Ip::EnableIpv6) | |
1754 | idnsSendSlaveAAAAQuery(q); | |
1755 | ||
7b724b86 | 1756 | } |
8db71107 | 1757 | |
1758 | void | |
b7ac5457 | 1759 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1760 | { |
3074b9d1 | 1761 | idns_query *q; |
1762 | ||
cc192b50 | 1763 | char ip[MAX_IPSTRLEN]; |
1764 | ||
4dd643d5 | 1765 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1766 | |
63a0e6b7 | 1767 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1768 | |
91dcbd43 CT |
1769 | // idns_query is POD so no constructors are called after allocation |
1770 | q->xact_id.change(); | |
049441d9 | 1771 | q->query_id = idnsQueryID(); |
71952967 | 1772 | |
4dd643d5 | 1773 | if (addr.isIPv6()) { |
cc192b50 | 1774 | struct in6_addr addr6; |
4dd643d5 | 1775 | addr.getInAddr(addr6); |
546ae352 | 1776 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1777 | } else { |
cc192b50 | 1778 | struct in_addr addr4; |
4dd643d5 | 1779 | addr.getInAddr(addr4); |
e210930b | 1780 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1781 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1782 | } |
1783 | ||
26ac0430 | 1784 | if (q->sz < 0) { |
2041330b | 1785 | /* problem with query data -- query not sent */ |
1786 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1787 | cbdataFree(q); |
2041330b | 1788 | return; |
1789 | } | |
1790 | ||
37f3da43 | 1791 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1792 | cbdataFree(q); |
1793 | return; | |
37f3da43 | 1794 | } |
1795 | ||
26ac0430 | 1796 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1797 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1798 | |
bce61b00 | 1799 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1800 | idnsStartQuery(q, callback, data); |
8db71107 | 1801 | } |
eb824054 | 1802 | |
59ad6d31 | 1803 | #if SQUID_SNMP |
3c573763 | 1804 | /* |
1805 | * The function to return the DNS via SNMP | |
1806 | */ | |
1807 | variable_list * | |
f64091a7 | 1808 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1809 | { |
1810 | int i, n = 0; | |
1811 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1812 | MemBuf tmp; |
1813 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1814 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1815 | |
3c573763 | 1816 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1817 | |
3c573763 | 1818 | case DNS_REQ: |
62e76326 | 1819 | |
95dc7ff4 | 1820 | for (i = 0; i < nns; ++i) |
62e76326 | 1821 | n += nameservers[i].nqueries; |
1822 | ||
1823 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1824 | n, | |
1825 | SMI_COUNTER32); | |
1826 | ||
1827 | break; | |
1828 | ||
3c573763 | 1829 | case DNS_REP: |
95dc7ff4 | 1830 | for (i = 0; i < nns; ++i) |
62e76326 | 1831 | n += nameservers[i].nreplies; |
1832 | ||
1833 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1834 | n, | |
1835 | SMI_COUNTER32); | |
1836 | ||
1837 | break; | |
1838 | ||
3c573763 | 1839 | case DNS_SERVERS: |
62e76326 | 1840 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1841 | nns, |
62e76326 | 1842 | SMI_COUNTER32); |
1843 | ||
1844 | break; | |
1845 | ||
3c573763 | 1846 | default: |
62e76326 | 1847 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1848 | ||
1849 | break; | |
3c573763 | 1850 | } |
62e76326 | 1851 | |
3c573763 | 1852 | return Answer; |
1853 | } | |
62e76326 | 1854 | |
3c573763 | 1855 | #endif /*SQUID_SNMP */ |
f53969cc | 1856 |