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7b724b86 | 1 | /* |
bde978a6 | 2 | * Copyright (C) 1996-2015 The Squid Software Foundation and contributors |
7b724b86 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7b724b86 | 7 | */ |
8 | ||
4a3b98d7 | 9 | /* DEBUG: section 78 DNS lookups; interacts with dns/rfc1035.cc */ |
bbc27441 | 10 | |
582c2af2 FC |
11 | #include "squid.h" |
12 | #include "base/InstanceId.h" | |
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" |
4a3b98d7 AJ |
20 | #include "dns/forward.h" |
21 | #include "dns/rfc3596.h" | |
cfd66529 | 22 | #include "event.h" |
c4ad1349 | 23 | #include "fd.h" |
2c471ba8 | 24 | #include "fde.h" |
055421ee | 25 | #include "ip/tools.h" |
0eb49b6d | 26 | #include "MemBuf.h" |
8822ebee | 27 | #include "mgr/Registration.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 | 214 | static bool idnsParseNameservers(void); |
a079e38b | 215 | static bool idnsParseResolvConf(void); |
be266cb2 | 216 | #if _SQUID_WINDOWS_ |
a079e38b | 217 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 218 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 219 | #endif |
33ab4aaf | 220 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 221 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 222 | static IOCB idnsReadVCHeader; |
e0d28505 | 223 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 224 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
225 | static IOCB idnsReadVC; |
226 | static IOCB idnsSentQueryVC; | |
62e76326 | 227 | |
b7ac5457 | 228 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 229 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 230 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 231 | static PF idnsRead; |
7cfc1c9a | 232 | static EVH idnsCheckQueue; |
efd900cb | 233 | static void idnsTickleQueue(void); |
558be27a | 234 | static void idnsRcodeCount(int, int); |
575d05c4 | 235 | static CLCB idnsVCClosed; |
91dcbd43 | 236 | static unsigned short idnsQueryID(void); |
049441d9 | 237 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 238 | |
a079e38b AJ |
239 | static void |
240 | idnsCheckMDNS(idns_query *q) | |
241 | { | |
bce61b00 AJ |
242 | if (!Config.onoff.dns_mdns || q->permit_mdns) |
243 | return; | |
244 | ||
a079e38b AJ |
245 | size_t slen = strlen(q->name); |
246 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
247 | q->permit_mdns = true; | |
248 | } | |
249 | } | |
250 | ||
251 | static void | |
252 | idnsAddMDNSNameservers() | |
253 | { | |
51aee437 | 254 | nns_mdns_count=0; |
a079e38b | 255 | |
bce61b00 AJ |
256 | // mDNS is disabled |
257 | if (!Config.onoff.dns_mdns) | |
258 | return; | |
259 | ||
a079e38b | 260 | // mDNS resolver addresses are explicit multicast group IPs |
51aee437 AJ |
261 | if (Ip::EnableIpv6) { |
262 | idnsAddNameserver("FF02::FB"); | |
263 | nameservers[nns-1].S.port(5353); | |
264 | nameservers[nns-1].mDNSResolver = true; | |
265 | ++nns_mdns_count; | |
266 | } | |
a079e38b AJ |
267 | |
268 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 269 | nameservers[nns-1].S.port(5353); |
a079e38b | 270 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
271 | |
272 | ++nns_mdns_count; | |
a079e38b AJ |
273 | } |
274 | ||
7b724b86 | 275 | static void |
276 | idnsAddNameserver(const char *buf) | |
277 | { | |
b7ac5457 | 278 | Ip::Address A; |
62e76326 | 279 | |
cc192b50 | 280 | if (!(A = buf)) { |
fa84c01d | 281 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 282 | return; |
d20b1cd0 | 283 | } |
62e76326 | 284 | |
4dd643d5 | 285 | if (A.isAnyAddr()) { |
fa84c01d | 286 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 287 | A.setLocalhost(); |
fa84c01d | 288 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 289 | } |
62e76326 | 290 | |
4dd643d5 | 291 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
292 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
293 | return; | |
5c5a349d | 294 | } |
62e76326 | 295 | |
7b724b86 | 296 | if (nns == nns_alloc) { |
62e76326 | 297 | int oldalloc = nns_alloc; |
298 | ns *oldptr = nameservers; | |
299 | ||
300 | if (nns_alloc == 0) | |
301 | nns_alloc = 2; | |
302 | else | |
303 | nns_alloc <<= 1; | |
304 | ||
305 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
306 | ||
307 | if (oldptr && oldalloc) | |
41d00cd3 | 308 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 309 | |
310 | if (oldptr) | |
311 | safe_free(oldptr); | |
7b724b86 | 312 | } |
62e76326 | 313 | |
7b724b86 | 314 | assert(nns < nns_alloc); |
4dd643d5 | 315 | A.port(NS_DEFAULTPORT); |
cc192b50 | 316 | nameservers[nns].S = A; |
e210930b AJ |
317 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
318 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
319 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
320 | #endif | |
cc192b50 | 321 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 322 | ++nns; |
7b724b86 | 323 | } |
324 | ||
68836b58 | 325 | static void |
326 | idnsAddPathComponent(const char *buf) | |
327 | { | |
328 | if (npc == npc_alloc) { | |
329 | int oldalloc = npc_alloc; | |
330 | sp *oldptr = searchpath; | |
331 | ||
332 | if (0 == npc_alloc) | |
333 | npc_alloc = 2; | |
334 | else | |
335 | npc_alloc <<= 1; | |
336 | ||
337 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
338 | ||
339 | if (oldptr && oldalloc) | |
41d00cd3 | 340 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 341 | |
342 | if (oldptr) | |
343 | safe_free(oldptr); | |
344 | } | |
345 | ||
346 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
347 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
348 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 349 | Tolower(searchpath[npc].domain); |
bf8fe701 | 350 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 351 | ++npc; |
68836b58 | 352 | } |
353 | ||
7b724b86 | 354 | static void |
355 | idnsFreeNameservers(void) | |
356 | { | |
357 | safe_free(nameservers); | |
358 | nns = nns_alloc = 0; | |
359 | } | |
360 | ||
68836b58 | 361 | static void |
362 | idnsFreeSearchpath(void) | |
363 | { | |
364 | safe_free(searchpath); | |
365 | npc = npc_alloc = 0; | |
366 | } | |
367 | ||
a079e38b | 368 | static bool |
efd900cb | 369 | idnsParseNameservers(void) |
370 | { | |
a079e38b AJ |
371 | bool result = false; |
372 | for (wordlist *w = Config.dns_nameservers; w; w = w->next) { | |
e0236918 | 373 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 374 | idnsAddNameserver(w->key); |
a079e38b | 375 | result = true; |
efd900cb | 376 | } |
a079e38b | 377 | return result; |
efd900cb | 378 | } |
379 | ||
a079e38b | 380 | static bool |
7b724b86 | 381 | idnsParseResolvConf(void) |
382 | { | |
a079e38b | 383 | bool result = false; |
aa0ca030 AJ |
384 | #if !_SQUID_WINDOWS_ || _SQUID_CYGWIN_ |
385 | FILE *fp = fopen(_PATH_RESCONF, "r"); | |
62e76326 | 386 | |
7b724b86 | 387 | if (fp == NULL) { |
e0236918 | 388 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
a079e38b | 389 | return false; |
7b724b86 | 390 | } |
62e76326 | 391 | |
be266cb2 | 392 | #if _SQUID_CYGWIN_ |
c4aefe96 | 393 | setmode(fileno(fp), O_TEXT); |
394 | #endif | |
62e76326 | 395 | |
aa0ca030 AJ |
396 | char buf[RESOLV_BUFSZ]; |
397 | const char *t = NULL; | |
68836b58 | 398 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 399 | t = strtok(buf, w_space); |
400 | ||
68836b58 | 401 | if (NULL == t) { |
62e76326 | 402 | continue; |
a37d6070 | 403 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 404 | t = strtok(NULL, w_space); |
62e76326 | 405 | |
68836b58 | 406 | if (NULL == t) |
407 | continue; | |
62e76326 | 408 | |
e0236918 | 409 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 410 | |
68836b58 | 411 | idnsAddNameserver(t); |
a079e38b | 412 | result = true; |
a37d6070 | 413 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
414 | idnsFreeSearchpath(); |
415 | t = strtok(NULL, w_space); | |
a083e75a | 416 | |
26ac0430 AJ |
417 | if (NULL == t) |
418 | continue; | |
a083e75a | 419 | |
e0236918 | 420 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 421 | |
26ac0430 | 422 | idnsAddPathComponent(t); |
a37d6070 | 423 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 424 | idnsFreeSearchpath(); |
68836b58 | 425 | while (NULL != t) { |
426 | t = strtok(NULL, w_space); | |
427 | ||
428 | if (NULL == t) | |
429 | continue; | |
430 | ||
e0236918 | 431 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 432 | |
433 | idnsAddPathComponent(t); | |
434 | } | |
a37d6070 | 435 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 436 | while (NULL != t) { |
437 | t = strtok(NULL, w_space); | |
62e76326 | 438 | |
68836b58 | 439 | if (NULL == t) |
440 | continue; | |
62e76326 | 441 | |
2c2da7d3 | 442 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 443 | ndots = atoi(t + 6); |
444 | ||
445 | if (ndots < 1) | |
446 | ndots = 1; | |
447 | ||
e0236918 | 448 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 449 | } |
450 | } | |
451 | } | |
7b724b86 | 452 | } |
a083e75a | 453 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
454 | t = strchr(t, '.'); |
455 | if (t) | |
456 | idnsAddPathComponent(t+1); | |
a083e75a | 457 | } |
62e76326 | 458 | |
7b724b86 | 459 | fclose(fp); |
aa0ca030 | 460 | #endif |
a079e38b | 461 | return result; |
7b724b86 | 462 | } |
463 | ||
be266cb2 | 464 | #if _SQUID_WINDOWS_ |
6b610e34 | 465 | static void |
d02b72b4 | 466 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 467 | { |
a16cb11f | 468 | char *t; |
6b610e34 | 469 | char *token; |
470 | HKEY hndKey; | |
471 | ||
0dde2160 | 472 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 473 | DWORD Type = 0; |
474 | DWORD Size = 0; | |
475 | LONG Result; | |
04f7fd38 | 476 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
477 | |
478 | if (Result == ERROR_SUCCESS && Size) { | |
479 | t = (char *) xmalloc(Size); | |
0dde2160 | 480 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 481 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
482 | idnsAddPathComponent(t); |
483 | xfree(t); | |
484 | } | |
04f7fd38 | 485 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 486 | |
487 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 488 | t = (char *) xmalloc(Size); |
04f7fd38 | 489 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 490 | token = strtok(t, Separator); |
6b610e34 | 491 | |
492 | while (token) { | |
493 | idnsAddPathComponent(token); | |
e0236918 | 494 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 495 | token = strtok(NULL, Separator); |
496 | } | |
26ac0430 | 497 | xfree(t); |
6b610e34 | 498 | } |
499 | ||
500 | RegCloseKey(hndKey); | |
501 | } | |
a6cae565 | 502 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
503 | t = strchr(t, '.'); |
504 | if (t) | |
505 | idnsAddPathComponent(t + 1); | |
a16cb11f | 506 | } |
6b610e34 | 507 | } |
508 | ||
a079e38b | 509 | static bool |
0e6d05ef | 510 | idnsParseWIN32Registry(void) |
511 | { | |
a16cb11f | 512 | char *t; |
0e6d05ef | 513 | char *token; |
514 | HKEY hndKey, hndKey2; | |
a079e38b | 515 | bool result = false; |
0e6d05ef | 516 | |
0e6d05ef | 517 | switch (WIN32_OS_version) { |
62e76326 | 518 | |
0e6d05ef | 519 | case _WIN_OS_WINNT: |
62e76326 | 520 | /* get nameservers from the Windows NT registry */ |
521 | ||
04f7fd38 | 522 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 523 | DWORD Type = 0; |
524 | DWORD Size = 0; | |
525 | LONG Result; | |
04f7fd38 | 526 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 527 | |
528 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 529 | t = (char *) xmalloc(Size); |
0dde2160 | 530 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 531 | token = strtok(t, ", "); |
62e76326 | 532 | |
533 | while (token) { | |
534 | idnsAddNameserver(token); | |
a079e38b | 535 | result = true; |
e0236918 | 536 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 537 | token = strtok(NULL, ","); |
62e76326 | 538 | } |
26ac0430 | 539 | xfree(t); |
62e76326 | 540 | } |
541 | ||
0dde2160 | 542 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 543 | |
544 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 545 | t = (char *) xmalloc(Size); |
a6cae565 | 546 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 547 | token = strtok(t, ", "); |
62e76326 | 548 | |
549 | while (token) { | |
e0236918 | 550 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 551 | idnsAddNameserver(token); |
a079e38b | 552 | result = true; |
62e76326 | 553 | token = strtok(NULL, ", "); |
554 | } | |
26ac0430 | 555 | xfree(t); |
62e76326 | 556 | } |
557 | ||
558 | RegCloseKey(hndKey); | |
559 | } | |
560 | ||
6b610e34 | 561 | idnsParseWIN32SearchList(" "); |
562 | ||
62e76326 | 563 | break; |
564 | ||
0e6d05ef | 565 | case _WIN_OS_WIN2K: |
62e76326 | 566 | |
b671cc68 | 567 | case _WIN_OS_WINXP: |
62e76326 | 568 | |
6b1846cf | 569 | case _WIN_OS_WINNET: |
28170269 | 570 | |
571 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
572 | |
573 | case _WIN_OS_WIN7: | |
62e76326 | 574 | /* get nameservers from the Windows 2000 registry */ |
575 | /* search all interfaces for DNS server addresses */ | |
576 | ||
04f7fd38 | 577 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 578 | int i; |
04f7fd38 AJ |
579 | DWORD MaxSubkeyLen, InterfacesCount; |
580 | char *keyname; | |
581 | FILETIME ftLastWriteTime; | |
582 | ||
583 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
584 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 585 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
586 | DWORD j; |
587 | j = MaxSubkeyLen; | |
588 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
589 | char *newkeyname; | |
590 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
591 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
592 | strcat(newkeyname, "\\"); | |
593 | strcat(newkeyname, keyname); | |
594 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
595 | DWORD Type = 0; | |
596 | DWORD Size = 0; | |
597 | LONG Result; | |
598 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
599 | if (Result == ERROR_SUCCESS && Size) { | |
600 | t = (char *) xmalloc(Size); | |
601 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
602 | token = strtok(t, ", "); | |
603 | while (token) { | |
e0236918 | 604 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 605 | idnsAddNameserver(token); |
a079e38b | 606 | result = true; |
04f7fd38 AJ |
607 | token = strtok(NULL, ", "); |
608 | } | |
609 | xfree(t); | |
610 | } | |
611 | ||
612 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
613 | if (Result == ERROR_SUCCESS && Size) { | |
614 | t = (char *) xmalloc(Size); | |
615 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
616 | token = strtok(t, ", "); | |
617 | while (token) { | |
e0236918 | 618 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 619 | idnsAddNameserver(token); |
a079e38b | 620 | result = true; |
04f7fd38 AJ |
621 | token = strtok(NULL, ", "); |
622 | } | |
623 | ||
624 | xfree(t); | |
62e76326 | 625 | } |
62e76326 | 626 | |
0dde2160 | 627 | RegCloseKey(hndKey2); |
62e76326 | 628 | } |
629 | ||
04f7fd38 | 630 | xfree(newkeyname); |
62e76326 | 631 | } |
632 | } | |
0dde2160 | 633 | |
04f7fd38 | 634 | xfree(keyname); |
62e76326 | 635 | } |
636 | ||
637 | RegCloseKey(hndKey); | |
638 | } | |
639 | ||
6b610e34 | 640 | idnsParseWIN32SearchList(", "); |
641 | ||
62e76326 | 642 | break; |
643 | ||
0e6d05ef | 644 | case _WIN_OS_WIN95: |
62e76326 | 645 | |
0e6d05ef | 646 | case _WIN_OS_WIN98: |
62e76326 | 647 | |
be20dac7 | 648 | case _WIN_OS_WINME: |
62e76326 | 649 | /* get nameservers from the Windows 9X registry */ |
650 | ||
04f7fd38 | 651 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 652 | DWORD Type = 0; |
653 | DWORD Size = 0; | |
654 | LONG Result; | |
04f7fd38 | 655 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 656 | |
657 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 658 | t = (char *) xmalloc(Size); |
a6cae565 | 659 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 660 | token = strtok(t, ", "); |
62e76326 | 661 | |
662 | while (token) { | |
e0236918 | 663 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 664 | idnsAddNameserver(token); |
a079e38b | 665 | result = true; |
62e76326 | 666 | token = strtok(NULL, ", "); |
667 | } | |
26ac0430 | 668 | xfree(t); |
62e76326 | 669 | } |
670 | ||
671 | RegCloseKey(hndKey); | |
672 | } | |
673 | ||
674 | break; | |
675 | ||
0e6d05ef | 676 | default: |
e0236918 | 677 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 678 | } |
a079e38b AJ |
679 | |
680 | return result; | |
0e6d05ef | 681 | } |
62e76326 | 682 | |
0e6d05ef | 683 | #endif |
684 | ||
7b724b86 | 685 | static void |
686 | idnsStats(StoreEntry * sentry) | |
687 | { | |
a16b4aa0 | 688 | dlink_node *n; |
689 | idns_query *q; | |
7cfc1c9a | 690 | int i; |
558be27a | 691 | int j; |
cc192b50 | 692 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 693 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 694 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 695 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
bce61b00 AJ |
696 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND M FQDN\n"); |
697 | storeAppendPrintf(sentry, "------ ---- ----- ---------- --------- - ----\n"); | |
62e76326 | 698 | |
a16b4aa0 | 699 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 700 | q = (idns_query *)n->data; |
bce61b00 | 701 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f %c %s\n", |
049441d9 | 702 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 703 | tvSubDsec(q->start_t, current_time), |
bce61b00 AJ |
704 | tvSubDsec(q->sent_t, current_time), |
705 | (q->permit_mdns? 'M':' '), | |
706 | q->name); | |
7cfc1c9a | 707 | } |
62e76326 | 708 | |
e210930b | 709 | if (Config.dns.packet_max > 0) |
bce61b00 | 710 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b | 711 | else |
bce61b00 | 712 | storeAppendPrintf(sentry, "\nDNS jumbo-grams: not working\n"); |
e210930b | 713 | |
7cfc1c9a | 714 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
715 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
716 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 717 | |
95dc7ff4 | 718 | for (i = 0; i < nns; ++i) { |
a079e38b | 719 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 720 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 721 | nameservers[i].nqueries, |
a079e38b AJ |
722 | nameservers[i].nreplies, |
723 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 724 | } |
62e76326 | 725 | |
558be27a | 726 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
727 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 728 | |
95dc7ff4 | 729 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 730 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
731 | ||
e210930b | 732 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 733 | |
95dc7ff4 | 734 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
735 | if (j > 10 && j < 16) |
736 | continue; // unassigned by IANA. | |
737 | ||
62e76326 | 738 | storeAppendPrintf(sentry, "%5d", j); |
739 | ||
95dc7ff4 | 740 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 741 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
742 | ||
e210930b | 743 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 744 | } |
6b610e34 | 745 | |
746 | if (npc) { | |
747 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
748 | ||
95dc7ff4 | 749 | for (i=0; i < npc; ++i) |
6b610e34 | 750 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
751 | ||
752 | storeAppendPrintf(sentry, "\n"); | |
753 | } | |
7b724b86 | 754 | } |
755 | ||
efd900cb | 756 | static void |
757 | idnsTickleQueue(void) | |
758 | { | |
759 | if (event_queued) | |
62e76326 | 760 | return; |
761 | ||
efd900cb | 762 | if (NULL == lru_list.tail) |
62e76326 | 763 | return; |
764 | ||
fd0f51c4 CT |
765 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
766 | ||
767 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 768 | |
efd900cb | 769 | event_queued = 1; |
770 | } | |
771 | ||
d24ef4e9 | 772 | static void |
ced8def3 | 773 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *, size_t size, Comm::Flag flag, int, void *data) |
d24ef4e9 | 774 | { |
775 | nsvc * vc = (nsvc *)data; | |
776 | ||
c8407295 | 777 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 778 | return; |
af6a12ee | 779 | |
e0d28505 AJ |
780 | // XXX: irrelevant now that we have conn pointer? |
781 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 782 | return; |
d24ef4e9 | 783 | |
c8407295 | 784 | if (flag != Comm::OK || size <= 0) { |
80463bb4 | 785 | conn->close(); |
d24ef4e9 | 786 | return; |
787 | } | |
788 | ||
789 | vc->busy = 0; | |
790 | idnsDoSendQueryVC(vc); | |
791 | } | |
792 | ||
793 | static void | |
794 | idnsDoSendQueryVC(nsvc *vc) | |
795 | { | |
796 | if (vc->busy) | |
797 | return; | |
798 | ||
032785bf | 799 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 800 | return; |
801 | ||
8401d6fc AR |
802 | // if retrying after a TC UDP response, our close handler cb may be pending |
803 | if (fd_table[vc->conn->fd].closing()) | |
804 | return; | |
805 | ||
032785bf | 806 | MemBuf *mb = vc->queue; |
d24ef4e9 | 807 | |
032785bf | 808 | vc->queue = new MemBuf; |
d24ef4e9 | 809 | |
810 | vc->busy = 1; | |
811 | ||
fd0f51c4 | 812 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
813 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
814 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 815 | AsyncCall::Pointer nil; |
d4b21972 | 816 | |
1b76e6c1 | 817 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 818 | |
ec41b64c AJ |
819 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
820 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 821 | Comm::Write(vc->conn, mb, call); |
032785bf | 822 | |
823 | delete mb; | |
d24ef4e9 | 824 | } |
825 | ||
826 | static void | |
ced8def3 | 827 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, Comm::Flag status, int, void *data) |
d24ef4e9 | 828 | { |
829 | nsvc * vc = (nsvc *)data; | |
830 | ||
c8407295 | 831 | if (status != Comm::OK || !conn) { |
dd3fb890 AR |
832 | char buf[MAX_IPSTRLEN] = ""; |
833 | if (vc->ns < nns) | |
4dd643d5 | 834 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 835 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 836 | return; |
837 | } | |
838 | ||
00406b24 | 839 | vc->conn = conn; |
cfd66529 AJ |
840 | |
841 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
842 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
843 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
844 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 845 | vc->busy = 0; |
846 | idnsDoSendQueryVC(vc); | |
847 | } | |
848 | ||
849 | static void | |
575d05c4 | 850 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 851 | { |
575d05c4 | 852 | nsvc * vc = (nsvc *)params.data; |
032785bf | 853 | delete vc->queue; |
854 | delete vc->msg; | |
00406b24 | 855 | vc->conn = NULL; |
4a3b98d7 | 856 | if (vc->ns < nns) // XXX: Dns::Shutdown may have freed nameservers[] |
dd3fb890 | 857 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 858 | cbdataFree(vc); |
d24ef4e9 | 859 | } |
860 | ||
861 | static void | |
9dca980d | 862 | idnsInitVC(int nsv) |
d24ef4e9 | 863 | { |
864 | nsvc *vc = cbdataAlloc(nsvc); | |
9dca980d | 865 | assert(nsv < nns); |
00406b24 | 866 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d AJ |
867 | nameservers[nsv].vc = vc; |
868 | vc->ns = nsv; | |
032785bf | 869 | vc->queue = new MemBuf; |
032785bf | 870 | vc->msg = new MemBuf; |
cfd66529 | 871 | vc->busy = 1; |
d24ef4e9 | 872 | |
00406b24 | 873 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 874 | |
4dd643d5 | 875 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
7fb5be3e | 876 | conn->setAddrs(Config.Addrs.udp_outgoing, nameservers[nsv].S); |
105f7a99 | 877 | else |
7fb5be3e | 878 | conn->setAddrs(Config.Addrs.udp_incoming, nameservers[nsv].S); |
105f7a99 | 879 | |
7fb5be3e | 880 | if (conn->remote.isIPv4()) |
4dd643d5 | 881 | conn->local.setIPv4(); |
f5ba22ff | 882 | |
cfd66529 | 883 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 884 | |
4accd6d8 | 885 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 886 | cs->setHost("DNS TCP Socket"); |
855150a4 | 887 | AsyncJob::Start(cs); |
d24ef4e9 | 888 | } |
889 | ||
890 | static void | |
9dca980d | 891 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 892 | { |
9dca980d AJ |
893 | assert(nsn < nns); |
894 | if (nameservers[nsn].vc == NULL) | |
895 | idnsInitVC(nsn); | |
d24ef4e9 | 896 | |
9dca980d | 897 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 898 | |
445962f3 HN |
899 | if (!vc) { |
900 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 901 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
902 | |
903 | return; | |
904 | } | |
905 | ||
2fe7eff9 | 906 | vc->queue->reset(); |
d24ef4e9 | 907 | |
908 | short head = htons(q->sz); | |
909 | ||
2fe7eff9 | 910 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 911 | |
2fe7eff9 | 912 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 913 | |
914 | idnsDoSendQueryVC(vc); | |
915 | } | |
916 | ||
7b724b86 | 917 | static void |
918 | idnsSendQuery(idns_query * q) | |
919 | { | |
4d6c8504 | 920 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 921 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 922 | return; |
0a69973e | 923 | } |
62e76326 | 924 | |
cc192b50 | 925 | if (nns <= 0) { |
e0236918 | 926 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 927 | return; |
928 | } | |
62e76326 | 929 | |
7b724b86 | 930 | assert(q->lru.next == NULL); |
62e76326 | 931 | |
7b724b86 | 932 | assert(q->lru.prev == NULL); |
62e76326 | 933 | |
4d6c8504 | 934 | int x = -1, y = -1; |
9dca980d | 935 | int nsn; |
4d6c8504 | 936 | |
213b6c90 | 937 | do { |
a079e38b AJ |
938 | // only use mDNS resolvers for mDNS compatible queries |
939 | if (!q->permit_mdns) | |
51aee437 | 940 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
941 | else |
942 | nsn = q->nsends % nns; | |
213b6c90 AJ |
943 | |
944 | if (q->need_vc) { | |
9dca980d | 945 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 946 | x = y = 0; |
213b6c90 | 947 | } else { |
4dd643d5 | 948 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 949 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 950 | else if (DnsSocketA >= 0) |
9dca980d | 951 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 952 | } |
62e76326 | 953 | |
95dc7ff4 | 954 | ++ q->nsends; |
62e76326 | 955 | |
33ab4aaf | 956 | q->sent_t = current_time; |
62e76326 | 957 | |
4dd643d5 | 958 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
e0236918 | 959 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4dd643d5 | 960 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
e0236918 | 961 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
962 | |
963 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 964 | |
bd6a0c8f | 965 | if (y > 0) { |
4d6c8504 | 966 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 967 | } |
bd6a0c8f | 968 | if (x > 0) { |
4d6c8504 | 969 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 970 | } |
62e76326 | 971 | |
9dca980d | 972 | ++ nameservers[nsn].nqueries; |
c131f066 | 973 | q->queue_t = current_time; |
7b724b86 | 974 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 975 | q->pending = 1; |
efd900cb | 976 | idnsTickleQueue(); |
7b724b86 | 977 | } |
978 | ||
979 | static int | |
b7ac5457 | 980 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 981 | { |
982 | int i; | |
62e76326 | 983 | |
95dc7ff4 | 984 | for (i = 0; i < nns; ++i) { |
cc192b50 | 985 | if (nameservers[i].S != from) |
62e76326 | 986 | continue; |
987 | ||
4dd643d5 | 988 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 989 | continue; |
990 | ||
991 | return i; | |
7b724b86 | 992 | } |
62e76326 | 993 | |
7cfc1c9a | 994 | return -1; |
7b724b86 | 995 | } |
996 | ||
997 | static idns_query * | |
998 | idnsFindQuery(unsigned short id) | |
999 | { | |
1000 | dlink_node *n; | |
1001 | idns_query *q; | |
62e76326 | 1002 | |
7b724b86 | 1003 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1004 | q = (idns_query*)n->data; |
1005 | ||
049441d9 | 1006 | if (q->query_id == id) |
62e76326 | 1007 | return q; |
7b724b86 | 1008 | } |
62e76326 | 1009 | |
7b724b86 | 1010 | return NULL; |
1011 | } | |
1012 | ||
108d67a0 | 1013 | static unsigned short |
1014 | idnsQueryID(void) | |
1015 | { | |
1016 | unsigned short id = squid_random() & 0xFFFF; | |
1017 | unsigned short first_id = id; | |
1018 | ||
26ac0430 | 1019 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1020 | ++id; |
108d67a0 | 1021 | |
846c8960 | 1022 | if (id == first_id) { |
e0236918 | 1023 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1024 | break; |
846c8960 | 1025 | } |
108d67a0 | 1026 | } |
1027 | ||
846c8960 | 1028 | return id; |
108d67a0 | 1029 | } |
1030 | ||
3074b9d1 | 1031 | static void |
33ab4aaf | 1032 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1033 | { |
1034 | IDNSCB *callback; | |
1035 | void *cbdata; | |
1036 | ||
33ab4aaf HN |
1037 | if (error) |
1038 | q->error = error; | |
1039 | ||
1040 | if (q->master) | |
1041 | q = q->master; | |
1042 | ||
33ab4aaf | 1043 | // If any of our subqueries are still pending then wait for them to complete before continuing |
9dca980d | 1044 | for (idns_query *q2 = q; q2; q2 = q2->slave) { |
33ab4aaf HN |
1045 | if (q2->pending) { |
1046 | return; | |
1047 | } | |
1048 | } | |
1049 | ||
1050 | /* Merge results */ | |
1051 | rfc1035_message *message = q->message; | |
1052 | q->message = NULL; | |
1053 | int n = q->ancount; | |
1054 | error = q->error; | |
1055 | ||
9dca980d | 1056 | while ( idns_query *q2 = q->slave ) { |
33ab4aaf HN |
1057 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); |
1058 | q->slave = q2->slave; | |
1059 | if ( !q2->error ) { | |
1060 | if (n > 0) { | |
1061 | // two sets of RR need merging | |
1062 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1063 | if (Config.dns.v4_first) { | |
1064 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1065 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1066 | } else { | |
1067 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1068 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1069 | } | |
1070 | n += q2->ancount; | |
1071 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1072 | // result, do not free them here | |
1073 | safe_free(message->answer); | |
1074 | safe_free(q2->message->answer); | |
1075 | message->answer = result; | |
1076 | message->ancount += q2->message->ancount; | |
1077 | } else { | |
1078 | // first response empty or failed, just use the second | |
1079 | rfc1035MessageDestroy(&message); | |
1080 | message = q2->message; | |
1081 | q2->message = NULL; | |
1082 | n = q2->ancount; | |
1083 | error = NULL; | |
1084 | } | |
1085 | } | |
1086 | rfc1035MessageDestroy(&q2->message); | |
1087 | cbdataFree(q2); | |
1088 | } | |
1089 | ||
1090 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1091 | ||
3074b9d1 | 1092 | callback = q->callback; |
1093 | q->callback = NULL; | |
33ab4aaf | 1094 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1095 | |
1096 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1097 | callback(cbdata, answers, n, error); | |
1098 | ||
26ac0430 | 1099 | while (q->queue) { |
3074b9d1 | 1100 | idns_query *q2 = q->queue; |
1101 | q->queue = q2->queue; | |
1102 | callback = q2->callback; | |
1103 | q2->callback = NULL; | |
1104 | ||
1105 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1106 | callback(cbdata, answers, n, error); | |
1107 | ||
63a0e6b7 | 1108 | cbdataFree(q2); |
3074b9d1 | 1109 | } |
1110 | ||
1111 | if (q->hash.key) { | |
1112 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1113 | q->hash.key = NULL; | |
1114 | } | |
33ab4aaf HN |
1115 | |
1116 | rfc1035MessageDestroy(&message); | |
1117 | cbdataFree(q); | |
3074b9d1 | 1118 | } |
1119 | ||
7b724b86 | 1120 | static void |
ced8def3 | 1121 | idnsGrokReply(const char *buf, size_t sz, int /*from_ns*/) |
7b724b86 | 1122 | { |
1123 | int n; | |
ec7bade0 | 1124 | rfc1035_message *message = NULL; |
7b724b86 | 1125 | idns_query *q; |
3074b9d1 | 1126 | |
cc192b50 | 1127 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1128 | |
ec7bade0 | 1129 | if (message == NULL) { |
e0236918 | 1130 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1131 | return; |
7b724b86 | 1132 | } |
62e76326 | 1133 | |
91dcbd43 | 1134 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1135 | |
1136 | q = idnsFindQuery(message->id); | |
1137 | ||
7b724b86 | 1138 | if (q == NULL) { |
bf8fe701 | 1139 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1140 | rfc1035MessageDestroy(&message); |
62e76326 | 1141 | return; |
7b724b86 | 1142 | } |
62e76326 | 1143 | |
9e1f210d | 1144 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1145 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1146 | rfc1035MessageDestroy(&message); |
9e1f210d | 1147 | return; |
1148 | } | |
1149 | ||
e210930b AJ |
1150 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1151 | // TODO: actually gr the message right here. | |
f53969cc SM |
1152 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q |
1153 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1154 | // AND allows us to merge AN+AR sections from both responses (one day) | |
e210930b AJ |
1155 | |
1156 | if (q->edns_seen >= 0) { | |
1157 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1158 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1159 | // the altered NS was limiting the whole group. | |
1160 | max_shared_edns = q->edns_seen; | |
1161 | // may be limited by one of the others still | |
95dc7ff4 | 1162 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1163 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1164 | } else { | |
1165 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1166 | // maybe reduce the global limit downwards to accomodate this NS | |
1167 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1168 | } | |
1169 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1170 | max_shared_edns = -1; | |
1171 | } | |
1172 | #endif | |
1173 | ||
049441d9 HN |
1174 | dlinkDelete(&q->lru, &lru_list); |
1175 | q->pending = 0; | |
1176 | ||
d24ef4e9 | 1177 | if (message->tc) { |
bae9832d | 1178 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1179 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1180 | |
1181 | if (!q->need_vc) { | |
1182 | q->need_vc = 1; | |
5e263176 | 1183 | -- q->nsends; |
d24ef4e9 | 1184 | idnsSendQuery(q); |
91dcbd43 CT |
1185 | } else { |
1186 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1187 | // Return an error and cleanup; no point in trying TCP again. | |
1188 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1189 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1190 | } |
1191 | ||
1192 | return; | |
1193 | } | |
9e1f210d | 1194 | |
558be27a | 1195 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1196 | |
558be27a | 1197 | if (n < 0) { |
7ba8d0b8 | 1198 | q->rcode = -n; |
42687bb2 | 1199 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1200 | |
95dc7ff4 | 1201 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1202 | /* |
1203 | * RCODE 2 is "Server failure - The name server was | |
1204 | * unable to process this query due to a problem with | |
1205 | * the name server." | |
1206 | */ | |
cc192b50 | 1207 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1208 | rfc1035MessageDestroy(&message); | |
62e76326 | 1209 | idnsSendQuery(q); |
1210 | return; | |
1211 | } | |
68836b58 | 1212 | |
0e6432d0 HN |
1213 | // Do searchpath processing on the master A query only to keep |
1214 | // things simple. NXDOMAIN is authorative for the label, not | |
1215 | // the record type. | |
049441d9 | 1216 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1217 | assert(NULL == message->answer); |
1218 | strcpy(q->name, q->orig); | |
1219 | ||
cc192b50 | 1220 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1221 | ||
68836b58 | 1222 | if (q->domain < npc) { |
1223 | strcat(q->name, "."); | |
1224 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1225 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1226 | ++ q->domain; |
68836b58 | 1227 | } else { |
95dc7ff4 | 1228 | ++ q->attempt; |
68836b58 | 1229 | } |
1230 | ||
049441d9 | 1231 | rfc1035MessageDestroy(&message); |
cc192b50 | 1232 | |
33ab4aaf | 1233 | // cleanup slave AAAA query |
049441d9 HN |
1234 | while (idns_query *slave = q->slave) { |
1235 | dlinkDelete(&slave->lru, &lru_list); | |
1236 | q->slave = slave->slave; | |
1237 | rfc1035MessageDestroy(&slave->message); | |
1238 | cbdataFree(slave); | |
cc192b50 | 1239 | } |
c7ba545e | 1240 | |
049441d9 HN |
1241 | // Build new query |
1242 | q->query_id = idnsQueryID(); | |
1243 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1244 | // see EDNS notes at top of file why this sends 0 | |
1245 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1246 | if (q->sz < 0) { |
1247 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1248 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1249 | return; |
1250 | } | |
1251 | ||
33ab4aaf HN |
1252 | q->nsends = 0; |
1253 | ||
a079e38b | 1254 | idnsCheckMDNS(q); |
68836b58 | 1255 | idnsSendQuery(q); |
049441d9 HN |
1256 | if (Ip::EnableIpv6) |
1257 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1258 | return; |
1259 | } | |
558be27a | 1260 | } |
62e76326 | 1261 | |
049441d9 HN |
1262 | q->message = message; |
1263 | q->ancount = n; | |
cc192b50 | 1264 | |
33ab4aaf HN |
1265 | if (n >= 0) |
1266 | idnsCallback(q, NULL); | |
1267 | else | |
1268 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1269 | |
7b724b86 | 1270 | } |
1271 | ||
1272 | static void | |
ced8def3 | 1273 | idnsRead(int fd, void *) |
7b724b86 | 1274 | { |
d193a436 | 1275 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1276 | int len; |
42b51993 | 1277 | int max = INCOMING_DNS_MAX; |
d29b40de | 1278 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1279 | Ip::Address from; |
cc192b50 | 1280 | |
d7e7eaa7 | 1281 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1282 | |
bd6a0c8f HN |
1283 | // Always keep reading. This stops (or at least makes harder) several |
1284 | // attacks on the DNS client. | |
d841c88d | 1285 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1286 | |
cc192b50 | 1287 | /* BUG (UNRESOLVED) |
1288 | * two code lines after returning from comm_udprecvfrom() | |
1289 | * something overwrites the memory behind the from parameter. | |
1290 | * NO matter where in the stack declaration list above it is placed | |
1291 | * The cause of this is still unknown, however copying the data appears | |
1292 | * to allow it to be passed further without this erasure. | |
1293 | */ | |
b7ac5457 | 1294 | Ip::Address bugbypass; |
62e76326 | 1295 | |
5e263176 FC |
1296 | while (max) { |
1297 | --max; | |
cc192b50 | 1298 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1299 | |
cc192b50 | 1300 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1301 | |
1302 | if (len == 0) | |
1303 | break; | |
1304 | ||
1305 | if (len < 0) { | |
1306 | if (ignoreErrno(errno)) | |
1307 | break; | |
1308 | ||
1191b93b | 1309 | #if _SQUID_LINUX_ |
62e76326 | 1310 | /* Some Linux systems seem to set the FD for reading and then |
1311 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1312 | * port unreachable message. */ | |
1313 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1314 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1315 | #endif |
62e76326 | 1316 | |
e0236918 | 1317 | debugs(50, DBG_IMPORTANT, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1318 | |
1319 | break; | |
1320 | } | |
1321 | ||
055421ee | 1322 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1323 | |
62e76326 | 1324 | assert(N); |
aec55359 | 1325 | ++(*N); |
cc192b50 | 1326 | |
1327 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1328 | ||
1329 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1330 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1331 | |
9dca980d AJ |
1332 | if (nsn >= 0) { |
1333 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1334 | } |
1335 | ||
1336 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1337 | // but after the ++ above to keep statistics right. | |
1338 | if (!lru_list.head) | |
1339 | continue; // Don't process replies if there is no pending query. | |
1340 | ||
9dca980d | 1341 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1342 | static time_t last_warning = 0; |
1343 | ||
1344 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1345 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1346 | last_warning = squid_curtime; |
26ac0430 | 1347 | } else { |
e0236918 | 1348 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1349 | } |
1350 | continue; | |
62e76326 | 1351 | } |
1352 | ||
9dca980d | 1353 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1354 | } |
1355 | } | |
1356 | ||
7cfc1c9a | 1357 | static void |
ced8def3 | 1358 | idnsCheckQueue(void *) |
7cfc1c9a | 1359 | { |
1360 | dlink_node *n; | |
0c4fe9e4 | 1361 | dlink_node *p = NULL; |
7cfc1c9a | 1362 | idns_query *q; |
1363 | event_queued = 0; | |
62e76326 | 1364 | |
820ee9fa AJ |
1365 | if (0 == nns) |
1366 | /* name servers went away; reconfiguring or shutting down */ | |
1367 | return; | |
1368 | ||
0c4fe9e4 | 1369 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1370 | |
820ee9fa | 1371 | p = n->prev; |
733cedc0 | 1372 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1373 | |
820ee9fa | 1374 | /* Anything to process in the queue? */ |
fd0f51c4 | 1375 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1376 | break; |
62e76326 | 1377 | |
33ab4aaf | 1378 | /* Query timer still running? */ |
fd0f51c4 | 1379 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1380 | dlinkDelete(&q->lru, &lru_list); |
1381 | q->queue_t = current_time; | |
1382 | dlinkAdd(q, &q->lru, &lru_list); | |
1383 | continue; | |
1384 | } | |
62e76326 | 1385 | |
91dcbd43 CT |
1386 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1387 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1388 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1389 | |
1390 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1391 | q->pending = 0; |
62e76326 | 1392 | |
fd0f51c4 | 1393 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1394 | idnsSendQuery(q); |
1395 | } else { | |
91dcbd43 | 1396 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1397 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1398 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1399 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1400 | |
1401 | if (q->rcode != 0) | |
33ab4aaf | 1402 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1403 | else |
33ab4aaf | 1404 | idnsCallback(q, "Timeout"); |
62e76326 | 1405 | } |
7cfc1c9a | 1406 | } |
62e76326 | 1407 | |
efd900cb | 1408 | idnsTickleQueue(); |
7cfc1c9a | 1409 | } |
1410 | ||
d24ef4e9 | 1411 | static void |
ced8def3 | 1412 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1413 | { |
1414 | nsvc * vc = (nsvc *)data; | |
1415 | ||
c8407295 | 1416 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1417 | return; |
1418 | ||
c8407295 | 1419 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1420 | if (Comm::IsConnOpen(conn)) |
1421 | conn->close(); | |
d24ef4e9 | 1422 | return; |
1423 | } | |
1424 | ||
bd6a0c8f | 1425 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1426 | |
032785bf | 1427 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1428 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1429 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1430 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1431 | return; |
1432 | } | |
1433 | ||
dd3fb890 | 1434 | assert(vc->ns < nns); |
e0d28505 | 1435 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1436 | |
e210930b | 1437 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1438 | vc->msg->clean(); |
abd8f140 AJ |
1439 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1440 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1441 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1442 | } |
1443 | ||
1444 | static void | |
ced8def3 | 1445 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, Comm::Flag flag, int, void *data) |
d24ef4e9 | 1446 | { |
1447 | nsvc * vc = (nsvc *)data; | |
1448 | ||
c8407295 | 1449 | if (flag == Comm::ERR_CLOSING) |
d24ef4e9 | 1450 | return; |
1451 | ||
c8407295 | 1452 | if (flag != Comm::OK || len <= 0) { |
80463bb4 AJ |
1453 | if (Comm::IsConnOpen(conn)) |
1454 | conn->close(); | |
d24ef4e9 | 1455 | return; |
1456 | } | |
1457 | ||
1458 | vc->read_msglen += len; | |
1459 | ||
1460 | assert(vc->read_msglen <= 2); | |
1461 | ||
1462 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1463 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1464 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1465 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1466 | return; |
1467 | } | |
1468 | ||
1469 | vc->read_msglen = 0; | |
1470 | ||
1471 | vc->msglen = ntohs(vc->msglen); | |
1472 | ||
8185c30b SS |
1473 | if (!vc->msglen) { |
1474 | if (Comm::IsConnOpen(conn)) | |
1475 | conn->close(); | |
1476 | return; | |
1477 | } | |
1478 | ||
2fe7eff9 | 1479 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1480 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1481 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1482 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1483 | } |
1484 | ||
558be27a | 1485 | /* |
1486 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1487 | */ | |
1488 | static void | |
1489 | idnsRcodeCount(int rcode, int attempt) | |
1490 | { | |
1491 | if (rcode > 0) | |
62e76326 | 1492 | rcode = 0; |
558be27a | 1493 | else if (rcode < 0) |
62e76326 | 1494 | rcode = -rcode; |
1495 | ||
558be27a | 1496 | if (rcode < MAX_RCODE) |
62e76326 | 1497 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1498 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1499 | } |
1500 | ||
7b724b86 | 1501 | void |
4a3b98d7 | 1502 | Dns::Init(void) |
7b724b86 | 1503 | { |
1504 | static int init = 0; | |
62e76326 | 1505 | |
d24ef4e9 | 1506 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1507 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1508 | |
4d6c8504 | 1509 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1510 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1511 | |
4dd643d5 | 1512 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1513 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1514 | else |
049441d9 | 1515 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1516 | |
049441d9 | 1517 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1518 | addrV4.setIPv4(); |
7e07ced1 | 1519 | |
4dd643d5 | 1520 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1521 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1522 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1523 | IPPROTO_UDP, |
049441d9 | 1524 | addrV6, |
04f7fd38 | 1525 | COMM_NONBLOCKING, |
055421ee | 1526 | "DNS Socket IPv6"); |
7e07ced1 | 1527 | } |
4d6c8504 | 1528 | |
4dd643d5 | 1529 | if (addrV4.isIPv4()) { |
049441d9 | 1530 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1531 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1532 | IPPROTO_UDP, |
049441d9 | 1533 | addrV4, |
04f7fd38 | 1534 | COMM_NONBLOCKING, |
055421ee | 1535 | "DNS Socket IPv4"); |
7e07ced1 | 1536 | } |
62e76326 | 1537 | |
4d6c8504 | 1538 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1539 | fatal("Could not create a DNS socket"); |
1540 | ||
1541 | /* Ouch... we can't call functions using debug from a debug | |
1542 | * statement. Doing so messes up the internal Debug::level | |
1543 | */ | |
04f7fd38 | 1544 | if (DnsSocketB >= 0) { |
e91e2a72 | 1545 | comm_local_port(DnsSocketB); |
e0236918 | 1546 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1547 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1548 | } |
04f7fd38 | 1549 | if (DnsSocketA >= 0) { |
e91e2a72 | 1550 | comm_local_port(DnsSocketA); |
e0236918 | 1551 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1552 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1553 | } |
7b724b86 | 1554 | } |
62e76326 | 1555 | |
efd900cb | 1556 | assert(0 == nns); |
a079e38b AJ |
1557 | idnsAddMDNSNameservers(); |
1558 | bool nsFound = idnsParseNameservers(); | |
62e76326 | 1559 | |
a079e38b AJ |
1560 | if (!nsFound) |
1561 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1562 | |
be266cb2 | 1563 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1564 | if (!nsFound) |
1565 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1566 | #endif |
62e76326 | 1567 | |
a079e38b | 1568 | if (!nsFound) { |
e0236918 | 1569 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1570 | #if _SQUID_WINDOWS_ |
e0236918 | 1571 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1572 | #else |
e0236918 | 1573 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1574 | #endif |
29fe9bd5 | 1575 | |
e0236918 | 1576 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
747552d8 AJ |
1577 | if (Ip::EnableIpv6) |
1578 | idnsAddNameserver("::1"); | |
29fe9bd5 | 1579 | idnsAddNameserver("127.0.0.1"); |
1580 | } | |
62e76326 | 1581 | |
7b724b86 | 1582 | if (!init) { |
62e76326 | 1583 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1584 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1585 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1586 | ++init; |
7b724b86 | 1587 | } |
372fb44e | 1588 | |
e210930b AJ |
1589 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1590 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1591 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1592 | max_shared_edns = -1; // disable if we might receive random replies. | |
1593 | } | |
1594 | #endif | |
1595 | ||
4a3b98d7 | 1596 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
7b724b86 | 1597 | } |
1598 | ||
1599 | void | |
4a3b98d7 | 1600 | Dns::Shutdown(void) |
7b724b86 | 1601 | { |
4d6c8504 | 1602 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1603 | return; |
1604 | ||
04f7fd38 | 1605 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1606 | comm_close(DnsSocketA); |
1607 | DnsSocketA = -1; | |
1608 | } | |
62e76326 | 1609 | |
055421ee | 1610 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1611 | comm_close(DnsSocketB); |
1612 | DnsSocketB = -1; | |
1613 | } | |
62e76326 | 1614 | |
95dc7ff4 | 1615 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1616 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1617 | if (Comm::IsConnOpen(vc->conn)) |
1618 | vc->conn->close(); | |
b26754c4 | 1619 | } |
1620 | } | |
1621 | ||
dd3fb890 | 1622 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1623 | idnsFreeNameservers(); |
68836b58 | 1624 | idnsFreeSearchpath(); |
7b724b86 | 1625 | } |
1626 | ||
3074b9d1 | 1627 | static int |
1628 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1629 | { | |
1630 | idns_query *q; | |
1631 | ||
1632 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1633 | ||
1634 | if (!old) | |
1635 | return 0; | |
1636 | ||
63a0e6b7 | 1637 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1638 | // idns_query is POD so no constructors are called after allocation |
1639 | q->xact_id.change(); | |
049441d9 | 1640 | // no query_id on this instance. |
3074b9d1 | 1641 | |
1642 | q->callback = callback; | |
1643 | ||
1644 | q->callback_data = cbdataReference(data); | |
1645 | ||
1646 | q->queue = old->queue; | |
1647 | ||
1648 | old->queue = q; | |
1649 | ||
1650 | return 1; | |
1651 | } | |
1652 | ||
1653 | static void | |
33ab4aaf | 1654 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1655 | { |
33ab4aaf HN |
1656 | q->start_t = current_time; |
1657 | q->callback = callback; | |
1658 | q->callback_data = cbdataReference(data); | |
1659 | ||
049441d9 | 1660 | q->hash.key = q->orig; |
3074b9d1 | 1661 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1662 | |
1663 | idnsSendQuery(q); | |
3074b9d1 | 1664 | } |
1665 | ||
049441d9 HN |
1666 | static void |
1667 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1668 | { | |
1669 | idns_query *q = cbdataAlloc(idns_query); | |
1670 | memcpy(q->name, master->name, sizeof(q->name)); | |
1671 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1672 | q->master = master; | |
1673 | q->query_id = idnsQueryID(); | |
1674 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1675 | q->start_t = master->start_t; |
049441d9 | 1676 | q->slave = master->slave; |
c7ba545e | 1677 | |
cafb131e | 1678 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1679 | ", id = 0x" << std::hex << q->query_id); |
1680 | if (!q->sz) { | |
1681 | cbdataFree(q); | |
1682 | return; | |
1683 | } | |
a079e38b | 1684 | idnsCheckMDNS(q); |
049441d9 HN |
1685 | master->slave = q; |
1686 | idnsSendQuery(q); | |
1687 | } | |
1688 | ||
7b724b86 | 1689 | void |
1690 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1691 | { | |
32f89713 NH |
1692 | size_t nameLength = strlen(name); |
1693 | ||
1694 | // Prevent buffer overflow on q->name | |
1695 | if (nameLength > NS_MAXDNAME) { | |
1696 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
1697 | callback(data, NULL, 0, "Internal error"); | |
1698 | return; | |
1699 | } | |
3074b9d1 | 1700 | |
1701 | if (idnsCachedLookup(name, callback, data)) | |
1702 | return; | |
1703 | ||
32f89713 | 1704 | idns_query *q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1705 | // idns_query is POD so no constructors are called after allocation |
1706 | q->xact_id.change(); | |
049441d9 | 1707 | q->query_id = idnsQueryID(); |
71952967 | 1708 | |
32f89713 NH |
1709 | int nd = 0; |
1710 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1711 | if (name[i] == '.') |
95dc7ff4 | 1712 | ++nd; |
68836b58 | 1713 | |
32f89713 | 1714 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1715 | q->do_searchpath = 1; |
1716 | } else { | |
1717 | q->do_searchpath = 0; | |
1718 | } | |
1719 | ||
1720 | strcpy(q->orig, name); | |
1721 | strcpy(q->name, q->orig); | |
1722 | ||
1723 | if (q->do_searchpath && nd < ndots) { | |
1724 | q->domain = 0; | |
1725 | strcat(q->name, "."); | |
1726 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1727 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1728 | } |
1729 | ||
049441d9 HN |
1730 | // see EDNS notes at top of file why this sends 0 |
1731 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1732 | |
2041330b | 1733 | if (q->sz < 0) { |
1734 | /* problem with query data -- query not sent */ | |
1735 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1736 | cbdataFree(q); |
2041330b | 1737 | return; |
1738 | } | |
1739 | ||
26ac0430 | 1740 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1741 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1742 | |
a079e38b | 1743 | idnsCheckMDNS(q); |
33ab4aaf | 1744 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1745 | |
1746 | if (Ip::EnableIpv6) | |
1747 | idnsSendSlaveAAAAQuery(q); | |
1748 | ||
7b724b86 | 1749 | } |
8db71107 | 1750 | |
1751 | void | |
b7ac5457 | 1752 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1753 | { |
3074b9d1 | 1754 | idns_query *q; |
1755 | ||
cc192b50 | 1756 | char ip[MAX_IPSTRLEN]; |
1757 | ||
4dd643d5 | 1758 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1759 | |
63a0e6b7 | 1760 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1761 | |
91dcbd43 CT |
1762 | // idns_query is POD so no constructors are called after allocation |
1763 | q->xact_id.change(); | |
049441d9 | 1764 | q->query_id = idnsQueryID(); |
71952967 | 1765 | |
4dd643d5 | 1766 | if (addr.isIPv6()) { |
cc192b50 | 1767 | struct in6_addr addr6; |
4dd643d5 | 1768 | addr.getInAddr(addr6); |
546ae352 | 1769 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1770 | } else { |
cc192b50 | 1771 | struct in_addr addr4; |
4dd643d5 | 1772 | addr.getInAddr(addr4); |
e210930b | 1773 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1774 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1775 | } |
1776 | ||
26ac0430 | 1777 | if (q->sz < 0) { |
2041330b | 1778 | /* problem with query data -- query not sent */ |
1779 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1780 | cbdataFree(q); |
2041330b | 1781 | return; |
1782 | } | |
1783 | ||
37f3da43 | 1784 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1785 | cbdataFree(q); |
1786 | return; | |
37f3da43 | 1787 | } |
1788 | ||
26ac0430 | 1789 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1790 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1791 | |
bce61b00 | 1792 | q->permit_mdns = Config.onoff.dns_mdns; |
33ab4aaf | 1793 | idnsStartQuery(q, callback, data); |
8db71107 | 1794 | } |
eb824054 | 1795 | |
59ad6d31 | 1796 | #if SQUID_SNMP |
3c573763 | 1797 | /* |
1798 | * The function to return the DNS via SNMP | |
1799 | */ | |
1800 | variable_list * | |
f64091a7 | 1801 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1802 | { |
1803 | int i, n = 0; | |
1804 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1805 | MemBuf tmp; |
1806 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1807 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1808 | |
3c573763 | 1809 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1810 | |
3c573763 | 1811 | case DNS_REQ: |
62e76326 | 1812 | |
95dc7ff4 | 1813 | for (i = 0; i < nns; ++i) |
62e76326 | 1814 | n += nameservers[i].nqueries; |
1815 | ||
1816 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1817 | n, | |
1818 | SMI_COUNTER32); | |
1819 | ||
1820 | break; | |
1821 | ||
3c573763 | 1822 | case DNS_REP: |
95dc7ff4 | 1823 | for (i = 0; i < nns; ++i) |
62e76326 | 1824 | n += nameservers[i].nreplies; |
1825 | ||
1826 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1827 | n, | |
1828 | SMI_COUNTER32); | |
1829 | ||
1830 | break; | |
1831 | ||
3c573763 | 1832 | case DNS_SERVERS: |
62e76326 | 1833 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1834 | nns, |
62e76326 | 1835 | SMI_COUNTER32); |
1836 | ||
1837 | break; | |
1838 | ||
3c573763 | 1839 | default: |
62e76326 | 1840 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1841 | ||
1842 | break; | |
3c573763 | 1843 | } |
62e76326 | 1844 | |
3c573763 | 1845 | return Answer; |
1846 | } | |
62e76326 | 1847 | |
3c573763 | 1848 | #endif /*SQUID_SNMP */ |
f53969cc | 1849 |