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7b724b86 | 1 | /* |
7b724b86 | 2 | * DEBUG: section 78 DNS lookups; interacts with lib/rfc1035.c |
3 | * AUTHOR: Duane Wessels | |
4 | * | |
2b6662ba | 5 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
7b724b86 | 6 | * ---------------------------------------------------------- |
7 | * | |
2b6662ba | 8 | * Squid is the result of efforts by numerous individuals from |
9 | * the Internet community; see the CONTRIBUTORS file for full | |
10 | * details. Many organizations have provided support for Squid's | |
11 | * development; see the SPONSORS file for full details. Squid is | |
12 | * Copyrighted (C) 2001 by the Regents of the University of | |
13 | * California; see the COPYRIGHT file for full details. Squid | |
14 | * incorporates software developed and/or copyrighted by other | |
15 | * sources; see the CREDITS file for full details. | |
7b724b86 | 16 | * |
17 | * This program is free software; you can redistribute it and/or modify | |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
26ac0430 | 21 | * |
7b724b86 | 22 | * This program is distributed in the hope that it will be useful, |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26ac0430 | 26 | * |
7b724b86 | 27 | * You should have received a copy of the GNU General Public License |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
30 | * | |
31 | */ | |
32 | ||
582c2af2 FC |
33 | #include "squid.h" |
34 | #include "base/InstanceId.h" | |
55cbb02b | 35 | #include "comm/Connection.h" |
aed188fd | 36 | #include "comm/ConnOpener.h" |
063dc1eb | 37 | #include "comm.h" |
d841c88d AJ |
38 | #include "comm/Loops.h" |
39 | #include "comm/Write.h" | |
cfd66529 | 40 | #include "event.h" |
c4ad1349 | 41 | #include "fd.h" |
2c471ba8 | 42 | #include "fde.h" |
055421ee | 43 | #include "ip/tools.h" |
8a89c28f | 44 | #include "Mem.h" |
0eb49b6d | 45 | #include "MemBuf.h" |
8822ebee | 46 | #include "mgr/Registration.h" |
582c2af2 | 47 | #include "rfc3596.h" |
4d5904f7 | 48 | #include "SquidConfig.h" |
582c2af2 FC |
49 | #include "SquidTime.h" |
50 | #include "Store.h" | |
8d03bdb4 | 51 | #include "tools.h" |
7176768b | 52 | #include "util.h" |
d295d770 | 53 | #include "wordlist.h" |
68836b58 | 54 | |
9c0a2256 FC |
55 | #if SQUID_SNMP |
56 | #include "snmp_core.h" | |
57 | #endif | |
58 | ||
68836b58 | 59 | #if HAVE_ARPA_NAMESER_H |
60 | #include <arpa/nameser.h> | |
61 | #endif | |
62 | #if HAVE_RESOLV_H | |
63 | #include <resolv.h> | |
64 | #endif | |
21d845b1 FC |
65 | #if HAVE_ERRNO_H |
66 | #include <errno.h> | |
67 | #endif | |
68836b58 | 68 | |
454e8283 | 69 | /* MS Visual Studio Projects are monolithic, so we need the following |
1f1ae50a | 70 | #ifndef to exclude the internal DNS code from compile process when |
71 | using external DNS process. | |
72 | */ | |
f64091a7 | 73 | #if !USE_DNSHELPER |
be266cb2 | 74 | #if _SQUID_WINDOWS_ |
0dde2160 GS |
75 | #define REG_TCPIP_PARA_INTERFACES "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces" |
76 | #define REG_TCPIP_PARA "SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters" | |
77 | #define REG_VXD_MSTCP "SYSTEM\\CurrentControlSet\\Services\\VxD\\MSTCP" | |
0e6d05ef | 78 | #endif |
68836b58 | 79 | #ifndef _PATH_RESCONF |
80 | #define _PATH_RESCONF "/etc/resolv.conf" | |
81 | #endif | |
82 | #ifndef NS_DEFAULTPORT | |
83 | #define NS_DEFAULTPORT 53 | |
84 | #endif | |
85 | ||
86 | #ifndef NS_MAXDNAME | |
87 | #define NS_MAXDNAME 1025 | |
88 | #endif | |
89 | ||
90 | #ifndef MAXDNSRCH | |
91 | #define MAXDNSRCH 6 | |
7b724b86 | 92 | #endif |
68836b58 | 93 | |
94 | /* The buffer size required to store the maximum allowed search path */ | |
95 | #ifndef RESOLV_BUFSZ | |
96 | #define RESOLV_BUFSZ NS_MAXDNAME * MAXDNSRCH + sizeof("search ") + 1 | |
7b724b86 | 97 | #endif |
98 | ||
42b51993 | 99 | #define IDNS_MAX_TRIES 20 |
e210930b | 100 | #define MAX_RCODE 17 |
558be27a | 101 | #define MAX_ATTEMPT 3 |
102 | static int RcodeMatrix[MAX_RCODE][MAX_ATTEMPT]; | |
e210930b AJ |
103 | // NP: see http://www.iana.org/assignments/dns-parameters |
104 | static const char *Rcodes[] = { | |
24520b1b AJ |
105 | /* RFC 1035 */ |
106 | "Success", | |
107 | "Packet Format Error", | |
108 | "DNS Server Failure", | |
109 | "Non-Existent Domain", | |
110 | "Not Implemented", | |
111 | "Query Refused", | |
112 | /* RFC 2136 */ | |
113 | "Name Exists when it should not", | |
114 | "RR Set Exists when it should not", | |
115 | "RR Set that should exist does not", | |
116 | "Server Not Authoritative for zone", | |
117 | "Name not contained in zone", | |
118 | /* unassigned */ | |
119 | "","","","","", | |
120 | /* RFC 2671 */ | |
121 | "Bad OPT Version or TSIG Signature Failure" | |
122 | }; | |
558be27a | 123 | |
58a39dc9 | 124 | typedef struct _idns_query idns_query; |
62e76326 | 125 | |
7b724b86 | 126 | typedef struct _ns ns; |
58a39dc9 | 127 | |
68836b58 | 128 | typedef struct _sp sp; |
129 | ||
d24ef4e9 | 130 | typedef struct _nsvc nsvc; |
131 | ||
26ac0430 | 132 | struct _idns_query { |
3074b9d1 | 133 | hash_link hash; |
9e1f210d | 134 | rfc1035_query query; |
68836b58 | 135 | char buf[RESOLV_BUFSZ]; |
136 | char name[NS_MAXDNAME + 1]; | |
137 | char orig[NS_MAXDNAME + 1]; | |
c4a7fa29 | 138 | ssize_t sz; |
049441d9 | 139 | unsigned short query_id; /// random query ID sent to server; changes with every query sent |
13b08e1c | 140 | InstanceId<idns_query> xact_id; /// identifies our "transaction", stays constant when query is retried |
91dcbd43 | 141 | |
58a39dc9 | 142 | int nsends; |
d24ef4e9 | 143 | int need_vc; |
a079e38b | 144 | bool permit_mdns; |
049441d9 | 145 | int pending; |
62e76326 | 146 | |
58a39dc9 | 147 | struct timeval start_t; |
148 | struct timeval sent_t; | |
820ee9fa | 149 | struct timeval queue_t; |
58a39dc9 | 150 | dlink_node lru; |
151 | IDNSCB *callback; | |
152 | void *callback_data; | |
558be27a | 153 | int attempt; |
7ba8d0b8 | 154 | int rcode; |
3074b9d1 | 155 | idns_query *queue; |
0e6432d0 HN |
156 | idns_query *slave; // single linked list |
157 | idns_query *master; // single pointer to a shared master | |
68836b58 | 158 | unsigned short domain; |
159 | unsigned short do_searchpath; | |
049441d9 HN |
160 | rfc1035_message *message; |
161 | int ancount; | |
33ab4aaf | 162 | const char *error; |
58a39dc9 | 163 | }; |
91dcbd43 | 164 | InstanceIdDefinitions(idns_query, "dns"); |
58a39dc9 | 165 | |
26ac0430 | 166 | struct _nsvc { |
d24ef4e9 | 167 | int ns; |
00406b24 | 168 | Comm::ConnectionPointer conn; |
d24ef4e9 | 169 | unsigned short msglen; |
170 | int read_msglen; | |
032785bf | 171 | MemBuf *msg; |
172 | MemBuf *queue; | |
d24ef4e9 | 173 | bool busy; |
174 | }; | |
175 | ||
26ac0430 | 176 | struct _ns { |
b7ac5457 | 177 | Ip::Address S; |
7b724b86 | 178 | int nqueries; |
179 | int nreplies; | |
e210930b AJ |
180 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
181 | int last_seen_edns; | |
182 | #endif | |
a079e38b | 183 | bool mDNSResolver; |
d24ef4e9 | 184 | nsvc *vc; |
7b724b86 | 185 | }; |
58a39dc9 | 186 | |
26ac0430 | 187 | struct _sp { |
68836b58 | 188 | char domain[NS_MAXDNAME]; |
189 | int queries; | |
190 | }; | |
191 | ||
d24ef4e9 | 192 | CBDATA_TYPE(nsvc); |
63a0e6b7 | 193 | CBDATA_TYPE(idns_query); |
d24ef4e9 | 194 | |
7b724b86 | 195 | static ns *nameservers = NULL; |
68836b58 | 196 | static sp *searchpath = NULL; |
7b724b86 | 197 | static int nns = 0; |
198 | static int nns_alloc = 0; | |
51aee437 | 199 | static int nns_mdns_count = 0; |
68836b58 | 200 | static int npc = 0; |
201 | static int npc_alloc = 0; | |
202 | static int ndots = 1; | |
7b724b86 | 203 | static dlink_list lru_list; |
7cfc1c9a | 204 | static int event_queued = 0; |
3074b9d1 | 205 | static hash_table *idns_lookup_hash = NULL; |
7b724b86 | 206 | |
e210930b AJ |
207 | /* |
208 | * Notes on EDNS: | |
209 | * | |
210 | * IPv4: | |
211 | * EDNS as specified may be sent as an additional record for any request. | |
212 | * early testing has revealed that it works on common devices, but cannot | |
213 | * be reliably used on any A or PTR requet done for IPv4 addresses. | |
214 | * | |
215 | * As such the IPv4 packets are still hard-coded not to contain EDNS (0) | |
216 | * | |
217 | * Squid design: | |
218 | * Squid is optimized to generate one packet and re-send it to all NS | |
219 | * due to this we cannot customize the EDNS size per NS. | |
220 | * | |
221 | * As such we take the configuration option value as fixed. | |
222 | * | |
223 | * FUTURE TODO: | |
224 | * This may not be worth doing, but if/when additional-records are parsed | |
225 | * we will be able to recover the OPT value specific to any one NS and | |
226 | * cache it. Effectively automating the tuning of EDNS advertised to the | |
227 | * size our active NS are capable. | |
228 | * Default would need to start with 512 bytes RFC1035 says every NS must accept. | |
229 | * Responses from the configured NS may cause this to be raised or turned off. | |
230 | */ | |
231 | #if WHEN_EDNS_RESPONSES_ARE_PARSED | |
232 | static int max_shared_edns = RFC1035_DEFAULT_PACKET_SZ; | |
233 | #endif | |
234 | ||
7b724b86 | 235 | static OBJH idnsStats; |
236 | static void idnsAddNameserver(const char *buf); | |
a079e38b | 237 | static void idnsAddMDNSNameservers(); |
68836b58 | 238 | static void idnsAddPathComponent(const char *buf); |
7b724b86 | 239 | static void idnsFreeNameservers(void); |
68836b58 | 240 | static void idnsFreeSearchpath(void); |
a079e38b AJ |
241 | static bool idnsParseNameservers(void); |
242 | #if _SQUID_WINDOWS_ | |
243 | static bool idnsParseResolvConf(void); | |
1f1ae50a | 244 | #endif |
be266cb2 | 245 | #if _SQUID_WINDOWS_ |
a079e38b | 246 | static bool idnsParseWIN32Registry(void); |
d02b72b4 | 247 | static void idnsParseWIN32SearchList(const char *); |
0e6d05ef | 248 | #endif |
33ab4aaf | 249 | static void idnsStartQuery(idns_query * q, IDNSCB * callback, void *data); |
7b724b86 | 250 | static void idnsSendQuery(idns_query * q); |
d24ef4e9 | 251 | static IOCB idnsReadVCHeader; |
e0d28505 | 252 | static void idnsDoSendQueryVC(nsvc *vc); |
cfd66529 | 253 | static CNCB idnsInitVCConnected; |
e0d28505 AJ |
254 | static IOCB idnsReadVC; |
255 | static IOCB idnsSentQueryVC; | |
62e76326 | 256 | |
b7ac5457 | 257 | static int idnsFromKnownNameserver(Ip::Address const &from); |
7b724b86 | 258 | static idns_query *idnsFindQuery(unsigned short id); |
e210930b | 259 | static void idnsGrokReply(const char *buf, size_t sz, int from_ns); |
7b724b86 | 260 | static PF idnsRead; |
7cfc1c9a | 261 | static EVH idnsCheckQueue; |
efd900cb | 262 | static void idnsTickleQueue(void); |
558be27a | 263 | static void idnsRcodeCount(int, int); |
575d05c4 | 264 | static CLCB idnsVCClosed; |
91dcbd43 | 265 | static unsigned short idnsQueryID(void); |
049441d9 | 266 | static void idnsSendSlaveAAAAQuery(idns_query *q); |
7b724b86 | 267 | |
a079e38b AJ |
268 | static void |
269 | idnsCheckMDNS(idns_query *q) | |
270 | { | |
271 | size_t slen = strlen(q->name); | |
272 | if (slen > 6 && memcmp(q->name +(slen-6),".local", 6) == 0) { | |
273 | q->permit_mdns = true; | |
274 | } | |
275 | } | |
276 | ||
277 | static void | |
278 | idnsAddMDNSNameservers() | |
279 | { | |
51aee437 | 280 | nns_mdns_count=0; |
a079e38b AJ |
281 | |
282 | // mDNS resolver addresses are explicit multicast group IPs | |
51aee437 AJ |
283 | if (Ip::EnableIpv6) { |
284 | idnsAddNameserver("FF02::FB"); | |
285 | nameservers[nns-1].S.port(5353); | |
286 | nameservers[nns-1].mDNSResolver = true; | |
287 | ++nns_mdns_count; | |
288 | } | |
a079e38b AJ |
289 | |
290 | idnsAddNameserver("224.0.0.251"); | |
57cb5aa1 | 291 | nameservers[nns-1].S.port(5353); |
a079e38b | 292 | nameservers[nns-1].mDNSResolver = true; |
51aee437 AJ |
293 | |
294 | ++nns_mdns_count; | |
a079e38b AJ |
295 | } |
296 | ||
7b724b86 | 297 | static void |
298 | idnsAddNameserver(const char *buf) | |
299 | { | |
b7ac5457 | 300 | Ip::Address A; |
62e76326 | 301 | |
cc192b50 | 302 | if (!(A = buf)) { |
fa84c01d | 303 | debugs(78, DBG_CRITICAL, "WARNING: rejecting '" << buf << "' as a name server, because it is not a numeric IP address"); |
62e76326 | 304 | return; |
d20b1cd0 | 305 | } |
62e76326 | 306 | |
4dd643d5 | 307 | if (A.isAnyAddr()) { |
fa84c01d | 308 | debugs(78, DBG_CRITICAL, "WARNING: Squid does not accept " << A << " in DNS server specifications."); |
4dd643d5 | 309 | A.setLocalhost(); |
fa84c01d | 310 | debugs(78, DBG_CRITICAL, "Will be using " << A << " instead, assuming you meant that DNS is running on the same machine"); |
5c5a349d | 311 | } |
62e76326 | 312 | |
4dd643d5 | 313 | if (!Ip::EnableIpv6 && !A.setIPv4()) { |
715b5def AJ |
314 | debugs(78, DBG_IMPORTANT, "WARNING: IPv6 is disabled. Discarding " << A << " in DNS server specifications."); |
315 | return; | |
5c5a349d | 316 | } |
62e76326 | 317 | |
7b724b86 | 318 | if (nns == nns_alloc) { |
62e76326 | 319 | int oldalloc = nns_alloc; |
320 | ns *oldptr = nameservers; | |
321 | ||
322 | if (nns_alloc == 0) | |
323 | nns_alloc = 2; | |
324 | else | |
325 | nns_alloc <<= 1; | |
326 | ||
327 | nameservers = (ns *)xcalloc(nns_alloc, sizeof(*nameservers)); | |
328 | ||
329 | if (oldptr && oldalloc) | |
41d00cd3 | 330 | memcpy(nameservers, oldptr, oldalloc * sizeof(*nameservers)); |
62e76326 | 331 | |
332 | if (oldptr) | |
333 | safe_free(oldptr); | |
7b724b86 | 334 | } |
62e76326 | 335 | |
7b724b86 | 336 | assert(nns < nns_alloc); |
4dd643d5 | 337 | A.port(NS_DEFAULTPORT); |
cc192b50 | 338 | nameservers[nns].S = A; |
e210930b AJ |
339 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
340 | nameservers[nns].last_seen_edns = RFC1035_DEFAULT_PACKET_SZ; | |
341 | // TODO generate a test packet to probe this NS from EDNS size and ability. | |
342 | #endif | |
cc192b50 | 343 | debugs(78, 3, "idnsAddNameserver: Added nameserver #" << nns << " (" << A << ")"); |
95dc7ff4 | 344 | ++nns; |
7b724b86 | 345 | } |
346 | ||
68836b58 | 347 | static void |
348 | idnsAddPathComponent(const char *buf) | |
349 | { | |
350 | if (npc == npc_alloc) { | |
351 | int oldalloc = npc_alloc; | |
352 | sp *oldptr = searchpath; | |
353 | ||
354 | if (0 == npc_alloc) | |
355 | npc_alloc = 2; | |
356 | else | |
357 | npc_alloc <<= 1; | |
358 | ||
359 | searchpath = (sp *)xcalloc(npc_alloc, sizeof(*searchpath)); | |
360 | ||
361 | if (oldptr && oldalloc) | |
41d00cd3 | 362 | memcpy(searchpath, oldptr, oldalloc * sizeof(*searchpath)); |
68836b58 | 363 | |
364 | if (oldptr) | |
365 | safe_free(oldptr); | |
366 | } | |
367 | ||
368 | assert(npc < npc_alloc); | |
0a84e4fb AJ |
369 | strncpy(searchpath[npc].domain, buf, sizeof(searchpath[npc].domain)-1); |
370 | searchpath[npc].domain[sizeof(searchpath[npc].domain)-1] = '\0'; | |
7176768b | 371 | Tolower(searchpath[npc].domain); |
bf8fe701 | 372 | debugs(78, 3, "idnsAddPathComponent: Added domain #" << npc << ": " << searchpath[npc].domain); |
95dc7ff4 | 373 | ++npc; |
68836b58 | 374 | } |
375 | ||
7b724b86 | 376 | static void |
377 | idnsFreeNameservers(void) | |
378 | { | |
379 | safe_free(nameservers); | |
380 | nns = nns_alloc = 0; | |
381 | } | |
382 | ||
68836b58 | 383 | static void |
384 | idnsFreeSearchpath(void) | |
385 | { | |
386 | safe_free(searchpath); | |
387 | npc = npc_alloc = 0; | |
388 | } | |
389 | ||
a079e38b | 390 | static bool |
efd900cb | 391 | idnsParseNameservers(void) |
392 | { | |
a079e38b AJ |
393 | bool result = false; |
394 | for (wordlist *w = Config.dns_nameservers; w; w = w->next) { | |
e0236918 | 395 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << w->key << " from squid.conf"); |
62e76326 | 396 | idnsAddNameserver(w->key); |
a079e38b | 397 | result = true; |
efd900cb | 398 | } |
a079e38b | 399 | return result; |
efd900cb | 400 | } |
401 | ||
7aa9bb3e | 402 | #if !_SQUID_WINDOWS_ |
a079e38b | 403 | static bool |
7b724b86 | 404 | idnsParseResolvConf(void) |
405 | { | |
406 | FILE *fp; | |
68836b58 | 407 | char buf[RESOLV_BUFSZ]; |
a083e75a | 408 | const char *t; |
a079e38b | 409 | bool result = false; |
68836b58 | 410 | fp = fopen(_PATH_RESCONF, "r"); |
62e76326 | 411 | |
7b724b86 | 412 | if (fp == NULL) { |
e0236918 | 413 | debugs(78, DBG_IMPORTANT, "" << _PATH_RESCONF << ": " << xstrerror()); |
a079e38b | 414 | return false; |
7b724b86 | 415 | } |
62e76326 | 416 | |
be266cb2 | 417 | #if _SQUID_CYGWIN_ |
c4aefe96 | 418 | setmode(fileno(fp), O_TEXT); |
419 | #endif | |
62e76326 | 420 | |
68836b58 | 421 | while (fgets(buf, RESOLV_BUFSZ, fp)) { |
62e76326 | 422 | t = strtok(buf, w_space); |
423 | ||
68836b58 | 424 | if (NULL == t) { |
62e76326 | 425 | continue; |
a37d6070 | 426 | } else if (strcmp(t, "nameserver") == 0) { |
68836b58 | 427 | t = strtok(NULL, w_space); |
62e76326 | 428 | |
68836b58 | 429 | if (NULL == t) |
430 | continue; | |
62e76326 | 431 | |
e0236918 | 432 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << t << " from " << _PATH_RESCONF); |
62e76326 | 433 | |
68836b58 | 434 | idnsAddNameserver(t); |
a079e38b | 435 | result = true; |
a37d6070 | 436 | } else if (strcmp(t, "domain") == 0) { |
26ac0430 AJ |
437 | idnsFreeSearchpath(); |
438 | t = strtok(NULL, w_space); | |
a083e75a | 439 | |
26ac0430 AJ |
440 | if (NULL == t) |
441 | continue; | |
a083e75a | 442 | |
e0236918 | 443 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
a083e75a | 444 | |
26ac0430 | 445 | idnsAddPathComponent(t); |
a37d6070 | 446 | } else if (strcmp(t, "search") == 0) { |
26ac0430 | 447 | idnsFreeSearchpath(); |
68836b58 | 448 | while (NULL != t) { |
449 | t = strtok(NULL, w_space); | |
450 | ||
451 | if (NULL == t) | |
452 | continue; | |
453 | ||
e0236918 | 454 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from " << _PATH_RESCONF); |
68836b58 | 455 | |
456 | idnsAddPathComponent(t); | |
457 | } | |
a37d6070 | 458 | } else if (strcmp(t, "options") == 0) { |
68836b58 | 459 | while (NULL != t) { |
460 | t = strtok(NULL, w_space); | |
62e76326 | 461 | |
68836b58 | 462 | if (NULL == t) |
463 | continue; | |
62e76326 | 464 | |
2c2da7d3 | 465 | if (strncmp(t, "ndots:", 6) == 0) { |
68836b58 | 466 | ndots = atoi(t + 6); |
467 | ||
468 | if (ndots < 1) | |
469 | ndots = 1; | |
470 | ||
e0236918 | 471 | debugs(78, DBG_IMPORTANT, "Adding ndots " << ndots << " from " << _PATH_RESCONF); |
68836b58 | 472 | } |
473 | } | |
474 | } | |
7b724b86 | 475 | } |
a083e75a | 476 | if (npc == 0 && (t = getMyHostname())) { |
26ac0430 AJ |
477 | t = strchr(t, '.'); |
478 | if (t) | |
479 | idnsAddPathComponent(t+1); | |
a083e75a | 480 | } |
62e76326 | 481 | |
7b724b86 | 482 | fclose(fp); |
a079e38b | 483 | return result; |
7b724b86 | 484 | } |
485 | ||
1f1ae50a | 486 | #endif |
487 | ||
be266cb2 | 488 | #if _SQUID_WINDOWS_ |
6b610e34 | 489 | static void |
d02b72b4 | 490 | idnsParseWIN32SearchList(const char * Separator) |
6b610e34 | 491 | { |
a16cb11f | 492 | char *t; |
6b610e34 | 493 | char *token; |
494 | HKEY hndKey; | |
495 | ||
0dde2160 | 496 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
6b610e34 | 497 | DWORD Type = 0; |
498 | DWORD Size = 0; | |
499 | LONG Result; | |
04f7fd38 | 500 | Result = RegQueryValueEx(hndKey, "Domain", NULL, &Type, NULL, &Size); |
26ac0430 AJ |
501 | |
502 | if (Result == ERROR_SUCCESS && Size) { | |
503 | t = (char *) xmalloc(Size); | |
0dde2160 | 504 | RegQueryValueEx(hndKey, "Domain", NULL, &Type, (LPBYTE) t, &Size); |
e0236918 | 505 | debugs(78, DBG_IMPORTANT, "Adding domain " << t << " from Registry"); |
26ac0430 AJ |
506 | idnsAddPathComponent(t); |
507 | xfree(t); | |
508 | } | |
04f7fd38 | 509 | Result = RegQueryValueEx(hndKey, "SearchList", NULL, &Type, NULL, &Size); |
6b610e34 | 510 | |
511 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 512 | t = (char *) xmalloc(Size); |
04f7fd38 | 513 | RegQueryValueEx(hndKey, "SearchList", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 514 | token = strtok(t, Separator); |
6b610e34 | 515 | |
516 | while (token) { | |
517 | idnsAddPathComponent(token); | |
e0236918 | 518 | debugs(78, DBG_IMPORTANT, "Adding domain " << token << " from Registry"); |
6b610e34 | 519 | token = strtok(NULL, Separator); |
520 | } | |
26ac0430 | 521 | xfree(t); |
6b610e34 | 522 | } |
523 | ||
524 | RegCloseKey(hndKey); | |
525 | } | |
a6cae565 | 526 | if (npc == 0 && (t = (char *) getMyHostname())) { |
26ac0430 AJ |
527 | t = strchr(t, '.'); |
528 | if (t) | |
529 | idnsAddPathComponent(t + 1); | |
a16cb11f | 530 | } |
6b610e34 | 531 | } |
532 | ||
a079e38b | 533 | static bool |
0e6d05ef | 534 | idnsParseWIN32Registry(void) |
535 | { | |
a16cb11f | 536 | char *t; |
0e6d05ef | 537 | char *token; |
538 | HKEY hndKey, hndKey2; | |
a079e38b | 539 | bool result = false; |
0e6d05ef | 540 | |
0e6d05ef | 541 | switch (WIN32_OS_version) { |
62e76326 | 542 | |
0e6d05ef | 543 | case _WIN_OS_WINNT: |
62e76326 | 544 | /* get nameservers from the Windows NT registry */ |
545 | ||
04f7fd38 | 546 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 547 | DWORD Type = 0; |
548 | DWORD Size = 0; | |
549 | LONG Result; | |
04f7fd38 | 550 | Result = RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, NULL, &Size); |
62e76326 | 551 | |
552 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 553 | t = (char *) xmalloc(Size); |
0dde2160 | 554 | RegQueryValueEx(hndKey, "DhcpNameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 555 | token = strtok(t, ", "); |
62e76326 | 556 | |
557 | while (token) { | |
558 | idnsAddNameserver(token); | |
a079e38b | 559 | result = true; |
e0236918 | 560 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
6b610e34 | 561 | token = strtok(NULL, ","); |
62e76326 | 562 | } |
26ac0430 | 563 | xfree(t); |
62e76326 | 564 | } |
565 | ||
0dde2160 | 566 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 567 | |
568 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 569 | t = (char *) xmalloc(Size); |
a6cae565 | 570 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 571 | token = strtok(t, ", "); |
62e76326 | 572 | |
573 | while (token) { | |
e0236918 | 574 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 575 | idnsAddNameserver(token); |
a079e38b | 576 | result = true; |
62e76326 | 577 | token = strtok(NULL, ", "); |
578 | } | |
26ac0430 | 579 | xfree(t); |
62e76326 | 580 | } |
581 | ||
582 | RegCloseKey(hndKey); | |
583 | } | |
584 | ||
6b610e34 | 585 | idnsParseWIN32SearchList(" "); |
586 | ||
62e76326 | 587 | break; |
588 | ||
0e6d05ef | 589 | case _WIN_OS_WIN2K: |
62e76326 | 590 | |
b671cc68 | 591 | case _WIN_OS_WINXP: |
62e76326 | 592 | |
6b1846cf | 593 | case _WIN_OS_WINNET: |
28170269 | 594 | |
595 | case _WIN_OS_WINLON: | |
4f5320f2 GS |
596 | |
597 | case _WIN_OS_WIN7: | |
62e76326 | 598 | /* get nameservers from the Windows 2000 registry */ |
599 | /* search all interfaces for DNS server addresses */ | |
600 | ||
04f7fd38 | 601 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_TCPIP_PARA_INTERFACES, 0, KEY_READ, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 602 | int i; |
04f7fd38 AJ |
603 | DWORD MaxSubkeyLen, InterfacesCount; |
604 | char *keyname; | |
605 | FILETIME ftLastWriteTime; | |
606 | ||
607 | if (RegQueryInfoKey(hndKey, NULL, NULL, NULL, &InterfacesCount, &MaxSubkeyLen, NULL, NULL, NULL, NULL, NULL, NULL) == ERROR_SUCCESS) { | |
608 | keyname = (char *) xmalloc(++MaxSubkeyLen); | |
95dc7ff4 | 609 | for (i = 0; i < (int) InterfacesCount; ++i) { |
04f7fd38 AJ |
610 | DWORD j; |
611 | j = MaxSubkeyLen; | |
612 | if (RegEnumKeyEx(hndKey, i, keyname, &j, NULL, NULL, NULL, &ftLastWriteTime) == ERROR_SUCCESS) { | |
613 | char *newkeyname; | |
614 | newkeyname = (char *) xmalloc(sizeof(REG_TCPIP_PARA_INTERFACES) + j + 2); | |
615 | strcpy(newkeyname, REG_TCPIP_PARA_INTERFACES); | |
616 | strcat(newkeyname, "\\"); | |
617 | strcat(newkeyname, keyname); | |
618 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, newkeyname, 0, KEY_QUERY_VALUE, &hndKey2) == ERROR_SUCCESS) { | |
619 | DWORD Type = 0; | |
620 | DWORD Size = 0; | |
621 | LONG Result; | |
622 | Result = RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, NULL, &Size); | |
623 | if (Result == ERROR_SUCCESS && Size) { | |
624 | t = (char *) xmalloc(Size); | |
625 | RegQueryValueEx(hndKey2, "DhcpNameServer", NULL, &Type, (LPBYTE)t, &Size); | |
626 | token = strtok(t, ", "); | |
627 | while (token) { | |
e0236918 | 628 | debugs(78, DBG_IMPORTANT, "Adding DHCP nameserver " << token << " from Registry"); |
04f7fd38 | 629 | idnsAddNameserver(token); |
a079e38b | 630 | result = true; |
04f7fd38 AJ |
631 | token = strtok(NULL, ", "); |
632 | } | |
633 | xfree(t); | |
634 | } | |
635 | ||
636 | Result = RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, NULL, &Size); | |
637 | if (Result == ERROR_SUCCESS && Size) { | |
638 | t = (char *) xmalloc(Size); | |
639 | RegQueryValueEx(hndKey2, "NameServer", NULL, &Type, (LPBYTE)t, &Size); | |
640 | token = strtok(t, ", "); | |
641 | while (token) { | |
e0236918 | 642 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
04f7fd38 | 643 | idnsAddNameserver(token); |
a079e38b | 644 | result = true; |
04f7fd38 AJ |
645 | token = strtok(NULL, ", "); |
646 | } | |
647 | ||
648 | xfree(t); | |
62e76326 | 649 | } |
62e76326 | 650 | |
0dde2160 | 651 | RegCloseKey(hndKey2); |
62e76326 | 652 | } |
653 | ||
04f7fd38 | 654 | xfree(newkeyname); |
62e76326 | 655 | } |
656 | } | |
0dde2160 | 657 | |
04f7fd38 | 658 | xfree(keyname); |
62e76326 | 659 | } |
660 | ||
661 | RegCloseKey(hndKey); | |
662 | } | |
663 | ||
6b610e34 | 664 | idnsParseWIN32SearchList(", "); |
665 | ||
62e76326 | 666 | break; |
667 | ||
0e6d05ef | 668 | case _WIN_OS_WIN95: |
62e76326 | 669 | |
0e6d05ef | 670 | case _WIN_OS_WIN98: |
62e76326 | 671 | |
be20dac7 | 672 | case _WIN_OS_WINME: |
62e76326 | 673 | /* get nameservers from the Windows 9X registry */ |
674 | ||
04f7fd38 | 675 | if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, REG_VXD_MSTCP, 0, KEY_QUERY_VALUE, &hndKey) == ERROR_SUCCESS) { |
62e76326 | 676 | DWORD Type = 0; |
677 | DWORD Size = 0; | |
678 | LONG Result; | |
04f7fd38 | 679 | Result = RegQueryValueEx(hndKey, "NameServer", NULL, &Type, NULL, &Size); |
62e76326 | 680 | |
681 | if (Result == ERROR_SUCCESS && Size) { | |
a16cb11f | 682 | t = (char *) xmalloc(Size); |
a6cae565 | 683 | RegQueryValueEx(hndKey, "NameServer", NULL, &Type, (LPBYTE) t, &Size); |
a16cb11f | 684 | token = strtok(t, ", "); |
62e76326 | 685 | |
686 | while (token) { | |
e0236918 | 687 | debugs(78, DBG_IMPORTANT, "Adding nameserver " << token << " from Registry"); |
62e76326 | 688 | idnsAddNameserver(token); |
a079e38b | 689 | result = true; |
62e76326 | 690 | token = strtok(NULL, ", "); |
691 | } | |
26ac0430 | 692 | xfree(t); |
62e76326 | 693 | } |
694 | ||
695 | RegCloseKey(hndKey); | |
696 | } | |
697 | ||
698 | break; | |
699 | ||
0e6d05ef | 700 | default: |
e0236918 | 701 | debugs(78, DBG_IMPORTANT, "Failed to read nameserver from Registry: Unknown System Type."); |
0e6d05ef | 702 | } |
a079e38b AJ |
703 | |
704 | return result; | |
0e6d05ef | 705 | } |
62e76326 | 706 | |
0e6d05ef | 707 | #endif |
708 | ||
7b724b86 | 709 | static void |
710 | idnsStats(StoreEntry * sentry) | |
711 | { | |
a16b4aa0 | 712 | dlink_node *n; |
713 | idns_query *q; | |
7cfc1c9a | 714 | int i; |
558be27a | 715 | int j; |
cc192b50 | 716 | char buf[MAX_IPSTRLEN]; |
7b724b86 | 717 | storeAppendPrintf(sentry, "Internal DNS Statistics:\n"); |
a16b4aa0 | 718 | storeAppendPrintf(sentry, "\nThe Queue:\n"); |
0a69973e | 719 | storeAppendPrintf(sentry, " DELAY SINCE\n"); |
720 | storeAppendPrintf(sentry, " ID SIZE SENDS FIRST SEND LAST SEND\n"); | |
721 | storeAppendPrintf(sentry, "------ ---- ----- ---------- ---------\n"); | |
62e76326 | 722 | |
a16b4aa0 | 723 | for (n = lru_list.head; n; n = n->next) { |
62e76326 | 724 | q = (idns_query *)n->data; |
725 | storeAppendPrintf(sentry, "%#06x %4d %5d %10.3f %9.3f\n", | |
049441d9 | 726 | (int) q->query_id, (int) q->sz, q->nsends, |
62e76326 | 727 | tvSubDsec(q->start_t, current_time), |
728 | tvSubDsec(q->sent_t, current_time)); | |
7cfc1c9a | 729 | } |
62e76326 | 730 | |
e210930b | 731 | if (Config.dns.packet_max > 0) |
d8b258a9 | 732 | storeAppendPrintf(sentry, "DNS jumbo-grams: %zd Bytes\n", Config.dns.packet_max); |
e210930b AJ |
733 | else |
734 | storeAppendPrintf(sentry, "DNS jumbo-grams: not working\n"); | |
735 | ||
7cfc1c9a | 736 | storeAppendPrintf(sentry, "\nNameservers:\n"); |
a079e38b AJ |
737 | storeAppendPrintf(sentry, "IP ADDRESS # QUERIES # REPLIES Type\n"); |
738 | storeAppendPrintf(sentry, "---------------------------------------------- --------- --------- --------\n"); | |
62e76326 | 739 | |
95dc7ff4 | 740 | for (i = 0; i < nns; ++i) { |
a079e38b | 741 | storeAppendPrintf(sentry, "%-45s %9d %9d %s\n", /* Let's take the maximum: (15 IPv4/45 IPv6) */ |
4dd643d5 | 742 | nameservers[i].S.toStr(buf,MAX_IPSTRLEN), |
62e76326 | 743 | nameservers[i].nqueries, |
a079e38b AJ |
744 | nameservers[i].nreplies, |
745 | nameservers[i].mDNSResolver?"multicast":"recurse"); | |
a16b4aa0 | 746 | } |
62e76326 | 747 | |
558be27a | 748 | storeAppendPrintf(sentry, "\nRcode Matrix:\n"); |
749 | storeAppendPrintf(sentry, "RCODE"); | |
62e76326 | 750 | |
95dc7ff4 | 751 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 752 | storeAppendPrintf(sentry, " ATTEMPT%d", i + 1); |
753 | ||
e210930b | 754 | storeAppendPrintf(sentry, " PROBLEM\n"); |
62e76326 | 755 | |
95dc7ff4 | 756 | for (j = 0; j < MAX_RCODE; ++j) { |
e210930b AJ |
757 | if (j > 10 && j < 16) |
758 | continue; // unassigned by IANA. | |
759 | ||
62e76326 | 760 | storeAppendPrintf(sentry, "%5d", j); |
761 | ||
95dc7ff4 | 762 | for (i = 0; i < MAX_ATTEMPT; ++i) |
62e76326 | 763 | storeAppendPrintf(sentry, " %8d", RcodeMatrix[j][i]); |
764 | ||
e210930b | 765 | storeAppendPrintf(sentry, " : %s\n",Rcodes[j]); |
558be27a | 766 | } |
6b610e34 | 767 | |
768 | if (npc) { | |
769 | storeAppendPrintf(sentry, "\nSearch list:\n"); | |
770 | ||
95dc7ff4 | 771 | for (i=0; i < npc; ++i) |
6b610e34 | 772 | storeAppendPrintf(sentry, "%s\n", searchpath[i].domain); |
773 | ||
774 | storeAppendPrintf(sentry, "\n"); | |
775 | } | |
7b724b86 | 776 | } |
777 | ||
efd900cb | 778 | static void |
779 | idnsTickleQueue(void) | |
780 | { | |
781 | if (event_queued) | |
62e76326 | 782 | return; |
783 | ||
efd900cb | 784 | if (NULL == lru_list.tail) |
62e76326 | 785 | return; |
786 | ||
fd0f51c4 CT |
787 | const double when = min(Config.Timeout.idns_query, Config.Timeout.idns_retransmit)/1000.0; |
788 | ||
789 | eventAdd("idnsCheckQueue", idnsCheckQueue, NULL, when, 1); | |
62e76326 | 790 | |
efd900cb | 791 | event_queued = 1; |
792 | } | |
793 | ||
d24ef4e9 | 794 | static void |
e0d28505 | 795 | idnsSentQueryVC(const Comm::ConnectionPointer &conn, char *buf, size_t size, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 796 | { |
797 | nsvc * vc = (nsvc *)data; | |
798 | ||
799 | if (flag == COMM_ERR_CLOSING) | |
800 | return; | |
af6a12ee | 801 | |
e0d28505 AJ |
802 | // XXX: irrelevant now that we have conn pointer? |
803 | if (!Comm::IsConnOpen(conn) || fd_table[conn->fd].closing()) | |
af6a12ee | 804 | return; |
d24ef4e9 | 805 | |
806 | if (flag != COMM_OK || size <= 0) { | |
80463bb4 | 807 | conn->close(); |
d24ef4e9 | 808 | return; |
809 | } | |
810 | ||
811 | vc->busy = 0; | |
812 | idnsDoSendQueryVC(vc); | |
813 | } | |
814 | ||
815 | static void | |
816 | idnsDoSendQueryVC(nsvc *vc) | |
817 | { | |
818 | if (vc->busy) | |
819 | return; | |
820 | ||
032785bf | 821 | if (vc->queue->contentSize() == 0) |
d24ef4e9 | 822 | return; |
823 | ||
8401d6fc AR |
824 | // if retrying after a TC UDP response, our close handler cb may be pending |
825 | if (fd_table[vc->conn->fd].closing()) | |
826 | return; | |
827 | ||
032785bf | 828 | MemBuf *mb = vc->queue; |
d24ef4e9 | 829 | |
032785bf | 830 | vc->queue = new MemBuf; |
d24ef4e9 | 831 | |
832 | vc->busy = 1; | |
833 | ||
fd0f51c4 | 834 | // Comm needs seconds but idnsCheckQueue() will check the exact timeout |
d4b21972 A |
835 | const int timeout = (Config.Timeout.idns_query % 1000 ? |
836 | Config.Timeout.idns_query + 1000 : Config.Timeout.idns_query) / 1000; | |
8d77a37c | 837 | AsyncCall::Pointer nil; |
d4b21972 | 838 | |
1b76e6c1 | 839 | commSetConnTimeout(vc->conn, timeout, nil); |
d24ef4e9 | 840 | |
ec41b64c AJ |
841 | AsyncCall::Pointer call = commCbCall(78, 5, "idnsSentQueryVC", |
842 | CommIoCbPtrFun(&idnsSentQueryVC, vc)); | |
b0388924 | 843 | Comm::Write(vc->conn, mb, call); |
032785bf | 844 | |
845 | delete mb; | |
d24ef4e9 | 846 | } |
847 | ||
848 | static void | |
00406b24 | 849 | idnsInitVCConnected(const Comm::ConnectionPointer &conn, comm_err_t status, int xerrno, void *data) |
d24ef4e9 | 850 | { |
851 | nsvc * vc = (nsvc *)data; | |
852 | ||
cfd66529 | 853 | if (status != COMM_OK || !conn) { |
dd3fb890 AR |
854 | char buf[MAX_IPSTRLEN] = ""; |
855 | if (vc->ns < nns) | |
4dd643d5 | 856 | nameservers[vc->ns].S.toStr(buf,MAX_IPSTRLEN); |
e0236918 | 857 | debugs(78, DBG_IMPORTANT, HERE << "Failed to connect to nameserver " << buf << " using TCP."); |
d24ef4e9 | 858 | return; |
859 | } | |
860 | ||
00406b24 | 861 | vc->conn = conn; |
cfd66529 AJ |
862 | |
863 | comm_add_close_handler(conn->fd, idnsVCClosed, vc); | |
abd8f140 AJ |
864 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
865 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
866 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 867 | vc->busy = 0; |
868 | idnsDoSendQueryVC(vc); | |
869 | } | |
870 | ||
871 | static void | |
575d05c4 | 872 | idnsVCClosed(const CommCloseCbParams ¶ms) |
d24ef4e9 | 873 | { |
575d05c4 | 874 | nsvc * vc = (nsvc *)params.data; |
032785bf | 875 | delete vc->queue; |
876 | delete vc->msg; | |
00406b24 | 877 | vc->conn = NULL; |
f64091a7 | 878 | if (vc->ns < nns) // XXX: dnsShutdown may have freed nameservers[] |
dd3fb890 | 879 | nameservers[vc->ns].vc = NULL; |
63a0e6b7 | 880 | cbdataFree(vc); |
d24ef4e9 | 881 | } |
882 | ||
883 | static void | |
9dca980d | 884 | idnsInitVC(int nsv) |
d24ef4e9 | 885 | { |
886 | nsvc *vc = cbdataAlloc(nsvc); | |
9dca980d | 887 | assert(nsv < nns); |
00406b24 | 888 | assert(vc->conn == NULL); // MUST be NULL from the construction process! |
9dca980d AJ |
889 | nameservers[nsv].vc = vc; |
890 | vc->ns = nsv; | |
032785bf | 891 | vc->queue = new MemBuf; |
032785bf | 892 | vc->msg = new MemBuf; |
cfd66529 | 893 | vc->busy = 1; |
d24ef4e9 | 894 | |
00406b24 | 895 | Comm::ConnectionPointer conn = new Comm::Connection(); |
105f7a99 | 896 | |
4dd643d5 | 897 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
105f7a99 AJ |
898 | conn->local = Config.Addrs.udp_outgoing; |
899 | else | |
900 | conn->local = Config.Addrs.udp_incoming; | |
901 | ||
9dca980d | 902 | conn->remote = nameservers[nsv].S; |
d24ef4e9 | 903 | |
4dd643d5 AJ |
904 | if (conn->remote.isIPv4()) { |
905 | conn->local.setIPv4(); | |
f5ba22ff AJ |
906 | } |
907 | ||
cfd66529 | 908 | AsyncCall::Pointer call = commCbCall(78,3, "idnsInitVCConnected", CommConnectCbPtrFun(idnsInitVCConnected, vc)); |
d24ef4e9 | 909 | |
4accd6d8 | 910 | Comm::ConnOpener *cs = new Comm::ConnOpener(conn, call, Config.Timeout.connect); |
aed188fd | 911 | cs->setHost("DNS TCP Socket"); |
855150a4 | 912 | AsyncJob::Start(cs); |
d24ef4e9 | 913 | } |
914 | ||
915 | static void | |
9dca980d | 916 | idnsSendQueryVC(idns_query * q, int nsn) |
d24ef4e9 | 917 | { |
9dca980d AJ |
918 | assert(nsn < nns); |
919 | if (nameservers[nsn].vc == NULL) | |
920 | idnsInitVC(nsn); | |
d24ef4e9 | 921 | |
9dca980d | 922 | nsvc *vc = nameservers[nsn].vc; |
d24ef4e9 | 923 | |
445962f3 HN |
924 | if (!vc) { |
925 | char buf[MAX_IPSTRLEN]; | |
4dd643d5 | 926 | debugs(78, DBG_IMPORTANT, "idnsSendQuery: Failed to initiate TCP connection to nameserver " << nameservers[nsn].S.toStr(buf,MAX_IPSTRLEN) << "!"); |
445962f3 HN |
927 | |
928 | return; | |
929 | } | |
930 | ||
2fe7eff9 | 931 | vc->queue->reset(); |
d24ef4e9 | 932 | |
933 | short head = htons(q->sz); | |
934 | ||
2fe7eff9 | 935 | vc->queue->append((char *)&head, 2); |
d24ef4e9 | 936 | |
2fe7eff9 | 937 | vc->queue->append(q->buf, q->sz); |
d24ef4e9 | 938 | |
939 | idnsDoSendQueryVC(vc); | |
940 | } | |
941 | ||
7b724b86 | 942 | static void |
943 | idnsSendQuery(idns_query * q) | |
944 | { | |
4d6c8504 | 945 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
e0236918 | 946 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS socket!"); |
62e76326 | 947 | return; |
0a69973e | 948 | } |
62e76326 | 949 | |
cc192b50 | 950 | if (nns <= 0) { |
e0236918 | 951 | debugs(78, DBG_IMPORTANT, "WARNING: idnsSendQuery: Can't send query, no DNS nameservers known!"); |
cc192b50 | 952 | return; |
953 | } | |
62e76326 | 954 | |
7b724b86 | 955 | assert(q->lru.next == NULL); |
62e76326 | 956 | |
7b724b86 | 957 | assert(q->lru.prev == NULL); |
62e76326 | 958 | |
4d6c8504 | 959 | int x = -1, y = -1; |
9dca980d | 960 | int nsn; |
4d6c8504 | 961 | |
213b6c90 | 962 | do { |
a079e38b AJ |
963 | // only use mDNS resolvers for mDNS compatible queries |
964 | if (!q->permit_mdns) | |
51aee437 | 965 | nsn = nns_mdns_count + q->nsends % (nns-nns_mdns_count); |
a079e38b AJ |
966 | else |
967 | nsn = q->nsends % nns; | |
213b6c90 AJ |
968 | |
969 | if (q->need_vc) { | |
9dca980d | 970 | idnsSendQueryVC(q, nsn); |
4d6c8504 | 971 | x = y = 0; |
213b6c90 | 972 | } else { |
4dd643d5 | 973 | if (DnsSocketB >= 0 && nameservers[nsn].S.isIPv6()) |
9dca980d | 974 | y = comm_udp_sendto(DnsSocketB, nameservers[nsn].S, q->buf, q->sz); |
049441d9 | 975 | else if (DnsSocketA >= 0) |
9dca980d | 976 | x = comm_udp_sendto(DnsSocketA, nameservers[nsn].S, q->buf, q->sz); |
213b6c90 | 977 | } |
62e76326 | 978 | |
95dc7ff4 | 979 | ++ q->nsends; |
62e76326 | 980 | |
33ab4aaf | 981 | q->sent_t = current_time; |
62e76326 | 982 | |
4dd643d5 | 983 | if (y < 0 && nameservers[nsn].S.isIPv6()) |
e0236918 | 984 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketB << ": sendto: " << xstrerror()); |
4dd643d5 | 985 | if (x < 0 && nameservers[nsn].S.isIPv4()) |
e0236918 | 986 | debugs(50, DBG_IMPORTANT, "idnsSendQuery: FD " << DnsSocketA << ": sendto: " << xstrerror()); |
4d6c8504 AJ |
987 | |
988 | } while ( (x<0 && y<0) && q->nsends % nns != 0); | |
62e76326 | 989 | |
bd6a0c8f | 990 | if (y > 0) { |
4d6c8504 | 991 | fd_bytes(DnsSocketB, y, FD_WRITE); |
4d6c8504 | 992 | } |
bd6a0c8f | 993 | if (x > 0) { |
4d6c8504 | 994 | fd_bytes(DnsSocketA, x, FD_WRITE); |
0a69973e | 995 | } |
62e76326 | 996 | |
9dca980d | 997 | ++ nameservers[nsn].nqueries; |
c131f066 | 998 | q->queue_t = current_time; |
7b724b86 | 999 | dlinkAdd(q, &q->lru, &lru_list); |
049441d9 | 1000 | q->pending = 1; |
efd900cb | 1001 | idnsTickleQueue(); |
7b724b86 | 1002 | } |
1003 | ||
1004 | static int | |
b7ac5457 | 1005 | idnsFromKnownNameserver(Ip::Address const &from) |
7b724b86 | 1006 | { |
1007 | int i; | |
62e76326 | 1008 | |
95dc7ff4 | 1009 | for (i = 0; i < nns; ++i) { |
cc192b50 | 1010 | if (nameservers[i].S != from) |
62e76326 | 1011 | continue; |
1012 | ||
4dd643d5 | 1013 | if (nameservers[i].S.port() != from.port()) |
62e76326 | 1014 | continue; |
1015 | ||
1016 | return i; | |
7b724b86 | 1017 | } |
62e76326 | 1018 | |
7cfc1c9a | 1019 | return -1; |
7b724b86 | 1020 | } |
1021 | ||
1022 | static idns_query * | |
1023 | idnsFindQuery(unsigned short id) | |
1024 | { | |
1025 | dlink_node *n; | |
1026 | idns_query *q; | |
62e76326 | 1027 | |
7b724b86 | 1028 | for (n = lru_list.tail; n; n = n->prev) { |
62e76326 | 1029 | q = (idns_query*)n->data; |
1030 | ||
049441d9 | 1031 | if (q->query_id == id) |
62e76326 | 1032 | return q; |
7b724b86 | 1033 | } |
62e76326 | 1034 | |
7b724b86 | 1035 | return NULL; |
1036 | } | |
1037 | ||
108d67a0 | 1038 | static unsigned short |
1039 | idnsQueryID(void) | |
1040 | { | |
1041 | unsigned short id = squid_random() & 0xFFFF; | |
1042 | unsigned short first_id = id; | |
1043 | ||
26ac0430 | 1044 | while (idnsFindQuery(id)) { |
95dc7ff4 | 1045 | ++id; |
108d67a0 | 1046 | |
846c8960 | 1047 | if (id == first_id) { |
e0236918 | 1048 | debugs(78, DBG_IMPORTANT, "idnsQueryID: Warning, too many pending DNS requests"); |
108d67a0 | 1049 | break; |
846c8960 | 1050 | } |
108d67a0 | 1051 | } |
1052 | ||
846c8960 | 1053 | return id; |
108d67a0 | 1054 | } |
1055 | ||
3074b9d1 | 1056 | static void |
33ab4aaf | 1057 | idnsCallback(idns_query *q, const char *error) |
3074b9d1 | 1058 | { |
1059 | IDNSCB *callback; | |
1060 | void *cbdata; | |
1061 | ||
33ab4aaf HN |
1062 | if (error) |
1063 | q->error = error; | |
1064 | ||
1065 | if (q->master) | |
1066 | q = q->master; | |
1067 | ||
33ab4aaf | 1068 | // If any of our subqueries are still pending then wait for them to complete before continuing |
9dca980d | 1069 | for (idns_query *q2 = q; q2; q2 = q2->slave) { |
33ab4aaf HN |
1070 | if (q2->pending) { |
1071 | return; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | /* Merge results */ | |
1076 | rfc1035_message *message = q->message; | |
1077 | q->message = NULL; | |
1078 | int n = q->ancount; | |
1079 | error = q->error; | |
1080 | ||
9dca980d | 1081 | while ( idns_query *q2 = q->slave ) { |
33ab4aaf HN |
1082 | debugs(78, 6, HERE << "Merging DNS results " << q->name << " A has " << n << " RR, AAAA has " << q2->ancount << " RR"); |
1083 | q->slave = q2->slave; | |
1084 | if ( !q2->error ) { | |
1085 | if (n > 0) { | |
1086 | // two sets of RR need merging | |
1087 | rfc1035_rr *result = (rfc1035_rr*) xmalloc( sizeof(rfc1035_rr)*(n + q2->ancount) ); | |
1088 | if (Config.dns.v4_first) { | |
1089 | memcpy(result, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1090 | memcpy(result+n, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1091 | } else { | |
1092 | memcpy(result, q2->message->answer, (sizeof(rfc1035_rr)*q2->ancount) ); | |
1093 | memcpy(result+q2->ancount, message->answer, (sizeof(rfc1035_rr)*n) ); | |
1094 | } | |
1095 | n += q2->ancount; | |
1096 | // HACK WARNING, the answer rr:s have been copied in-place to | |
1097 | // result, do not free them here | |
1098 | safe_free(message->answer); | |
1099 | safe_free(q2->message->answer); | |
1100 | message->answer = result; | |
1101 | message->ancount += q2->message->ancount; | |
1102 | } else { | |
1103 | // first response empty or failed, just use the second | |
1104 | rfc1035MessageDestroy(&message); | |
1105 | message = q2->message; | |
1106 | q2->message = NULL; | |
1107 | n = q2->ancount; | |
1108 | error = NULL; | |
1109 | } | |
1110 | } | |
1111 | rfc1035MessageDestroy(&q2->message); | |
1112 | cbdataFree(q2); | |
1113 | } | |
1114 | ||
1115 | debugs(78, 6, HERE << "Sending " << n << " (" << (error ? error : "OK") << ") DNS results to caller."); | |
1116 | ||
3074b9d1 | 1117 | callback = q->callback; |
1118 | q->callback = NULL; | |
33ab4aaf | 1119 | const rfc1035_rr *answers = message ? message->answer : NULL; |
3074b9d1 | 1120 | |
1121 | if (cbdataReferenceValidDone(q->callback_data, &cbdata)) | |
1122 | callback(cbdata, answers, n, error); | |
1123 | ||
26ac0430 | 1124 | while (q->queue) { |
3074b9d1 | 1125 | idns_query *q2 = q->queue; |
1126 | q->queue = q2->queue; | |
1127 | callback = q2->callback; | |
1128 | q2->callback = NULL; | |
1129 | ||
1130 | if (cbdataReferenceValidDone(q2->callback_data, &cbdata)) | |
1131 | callback(cbdata, answers, n, error); | |
1132 | ||
63a0e6b7 | 1133 | cbdataFree(q2); |
3074b9d1 | 1134 | } |
1135 | ||
1136 | if (q->hash.key) { | |
1137 | hash_remove_link(idns_lookup_hash, &q->hash); | |
1138 | q->hash.key = NULL; | |
1139 | } | |
33ab4aaf HN |
1140 | |
1141 | rfc1035MessageDestroy(&message); | |
1142 | cbdataFree(q); | |
3074b9d1 | 1143 | } |
1144 | ||
7b724b86 | 1145 | static void |
e210930b | 1146 | idnsGrokReply(const char *buf, size_t sz, int from_ns) |
7b724b86 | 1147 | { |
1148 | int n; | |
ec7bade0 | 1149 | rfc1035_message *message = NULL; |
7b724b86 | 1150 | idns_query *q; |
3074b9d1 | 1151 | |
cc192b50 | 1152 | n = rfc1035MessageUnpack(buf, sz, &message); |
62e76326 | 1153 | |
ec7bade0 | 1154 | if (message == NULL) { |
e0236918 | 1155 | debugs(78, DBG_IMPORTANT, "idnsGrokReply: Malformed DNS response"); |
62e76326 | 1156 | return; |
7b724b86 | 1157 | } |
62e76326 | 1158 | |
91dcbd43 | 1159 | debugs(78, 3, "idnsGrokReply: QID 0x" << std::hex << message->id << ", " << std::dec << n << " answers"); |
ec7bade0 | 1160 | |
1161 | q = idnsFindQuery(message->id); | |
1162 | ||
7b724b86 | 1163 | if (q == NULL) { |
bf8fe701 | 1164 | debugs(78, 3, "idnsGrokReply: Late response"); |
cc192b50 | 1165 | rfc1035MessageDestroy(&message); |
62e76326 | 1166 | return; |
7b724b86 | 1167 | } |
62e76326 | 1168 | |
9e1f210d | 1169 | if (rfc1035QueryCompare(&q->query, message->query) != 0) { |
bf8fe701 | 1170 | debugs(78, 3, "idnsGrokReply: Query mismatch (" << q->query.name << " != " << message->query->name << ")"); |
cc192b50 | 1171 | rfc1035MessageDestroy(&message); |
9e1f210d | 1172 | return; |
1173 | } | |
1174 | ||
e210930b AJ |
1175 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1176 | // TODO: actually gr the message right here. | |
1177 | // pull out the DNS meta data we need (A records, AAAA records and EDNS OPT) and store in q | |
1178 | // this is overall better than force-feeding A response with AAAA an section later anyway. | |
1179 | // AND allows us to merge AN+AR sections from both responses (one day) | |
1180 | ||
1181 | if (q->edns_seen >= 0) { | |
1182 | if (max_shared_edns == nameservers[from_ns].last_seen_edns && max_shared_edns < q->edns_seen) { | |
1183 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1184 | // the altered NS was limiting the whole group. | |
1185 | max_shared_edns = q->edns_seen; | |
1186 | // may be limited by one of the others still | |
95dc7ff4 | 1187 | for (int i = 0; i < nns; ++i) |
e210930b AJ |
1188 | max_shared_edns = min(max_shared_edns, nameservers[i].last_seen_edns); |
1189 | } else { | |
1190 | nameservers[from_ns].last_seen_edns = q->edns_seen; | |
1191 | // maybe reduce the global limit downwards to accomodate this NS | |
1192 | max_shared_edns = min(max_shared_edns, q->edns_seen); | |
1193 | } | |
1194 | if (max_shared_edns < RFC1035_DEFAULT_PACKET_SZ) | |
1195 | max_shared_edns = -1; | |
1196 | } | |
1197 | #endif | |
1198 | ||
049441d9 HN |
1199 | dlinkDelete(&q->lru, &lru_list); |
1200 | q->pending = 0; | |
1201 | ||
d24ef4e9 | 1202 | if (message->tc) { |
bae9832d | 1203 | debugs(78, 3, HERE << "Resolver requested TC (" << q->query.name << ")"); |
cc192b50 | 1204 | rfc1035MessageDestroy(&message); |
d24ef4e9 | 1205 | |
1206 | if (!q->need_vc) { | |
1207 | q->need_vc = 1; | |
5e263176 | 1208 | -- q->nsends; |
d24ef4e9 | 1209 | idnsSendQuery(q); |
91dcbd43 CT |
1210 | } else { |
1211 | // Strange: A TCP DNS response with the truncation bit (TC) set. | |
1212 | // Return an error and cleanup; no point in trying TCP again. | |
1213 | debugs(78, 3, HERE << "TCP DNS response"); | |
33ab4aaf | 1214 | idnsCallback(q, "Truncated TCP DNS response"); |
d24ef4e9 | 1215 | } |
1216 | ||
1217 | return; | |
1218 | } | |
9e1f210d | 1219 | |
558be27a | 1220 | idnsRcodeCount(n, q->attempt); |
62e76326 | 1221 | |
558be27a | 1222 | if (n < 0) { |
7ba8d0b8 | 1223 | q->rcode = -n; |
42687bb2 | 1224 | debugs(78, 3, "idnsGrokReply: error " << rfc1035ErrorMessage(n) << " (" << q->rcode << ")"); |
7ba8d0b8 | 1225 | |
95dc7ff4 | 1226 | if (q->rcode == 2 && (++ q->attempt) < MAX_ATTEMPT) { |
62e76326 | 1227 | /* |
1228 | * RCODE 2 is "Server failure - The name server was | |
1229 | * unable to process this query due to a problem with | |
1230 | * the name server." | |
1231 | */ | |
cc192b50 | 1232 | debugs(78, 3, "idnsGrokReply: Query result: SERV_FAIL"); |
1233 | rfc1035MessageDestroy(&message); | |
62e76326 | 1234 | idnsSendQuery(q); |
1235 | return; | |
1236 | } | |
68836b58 | 1237 | |
0e6432d0 HN |
1238 | // Do searchpath processing on the master A query only to keep |
1239 | // things simple. NXDOMAIN is authorative for the label, not | |
1240 | // the record type. | |
049441d9 | 1241 | if (q->rcode == 3 && !q->master && q->do_searchpath && q->attempt < MAX_ATTEMPT) { |
68836b58 | 1242 | assert(NULL == message->answer); |
1243 | strcpy(q->name, q->orig); | |
1244 | ||
cc192b50 | 1245 | debugs(78, 3, "idnsGrokReply: Query result: NXDOMAIN - " << q->name ); |
1246 | ||
68836b58 | 1247 | if (q->domain < npc) { |
1248 | strcat(q->name, "."); | |
1249 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1250 | debugs(78, 3, "idnsGrokReply: searchpath used for " << q->name); |
95dc7ff4 | 1251 | ++ q->domain; |
68836b58 | 1252 | } else { |
95dc7ff4 | 1253 | ++ q->attempt; |
68836b58 | 1254 | } |
1255 | ||
049441d9 | 1256 | rfc1035MessageDestroy(&message); |
cc192b50 | 1257 | |
33ab4aaf | 1258 | // cleanup slave AAAA query |
049441d9 HN |
1259 | while (idns_query *slave = q->slave) { |
1260 | dlinkDelete(&slave->lru, &lru_list); | |
1261 | q->slave = slave->slave; | |
1262 | rfc1035MessageDestroy(&slave->message); | |
1263 | cbdataFree(slave); | |
cc192b50 | 1264 | } |
c7ba545e | 1265 | |
049441d9 HN |
1266 | // Build new query |
1267 | q->query_id = idnsQueryID(); | |
1268 | debugs(78, 3, "idnsGrokReply: Trying A Query for " << q->name); | |
1269 | // see EDNS notes at top of file why this sends 0 | |
1270 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
c4a7fa29 AJ |
1271 | if (q->sz < 0) { |
1272 | /* problem with query data -- query not sent */ | |
33ab4aaf | 1273 | idnsCallback(q, "Internal error"); |
c4a7fa29 AJ |
1274 | return; |
1275 | } | |
1276 | ||
33ab4aaf HN |
1277 | q->nsends = 0; |
1278 | ||
a079e38b | 1279 | idnsCheckMDNS(q); |
68836b58 | 1280 | idnsSendQuery(q); |
049441d9 HN |
1281 | if (Ip::EnableIpv6) |
1282 | idnsSendSlaveAAAAQuery(q); | |
68836b58 | 1283 | return; |
1284 | } | |
558be27a | 1285 | } |
62e76326 | 1286 | |
049441d9 HN |
1287 | q->message = message; |
1288 | q->ancount = n; | |
cc192b50 | 1289 | |
33ab4aaf HN |
1290 | if (n >= 0) |
1291 | idnsCallback(q, NULL); | |
1292 | else | |
1293 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); | |
bae9832d | 1294 | |
7b724b86 | 1295 | } |
1296 | ||
1297 | static void | |
1298 | idnsRead(int fd, void *data) | |
1299 | { | |
d193a436 | 1300 | int *N = &incoming_sockets_accepted; |
0b6d1955 | 1301 | int len; |
42b51993 | 1302 | int max = INCOMING_DNS_MAX; |
d29b40de | 1303 | static char rbuf[SQUID_UDP_SO_RCVBUF]; |
b7ac5457 | 1304 | Ip::Address from; |
cc192b50 | 1305 | |
d7e7eaa7 | 1306 | debugs(78, 3, "idnsRead: starting with FD " << fd); |
cc192b50 | 1307 | |
bd6a0c8f HN |
1308 | // Always keep reading. This stops (or at least makes harder) several |
1309 | // attacks on the DNS client. | |
d841c88d | 1310 | Comm::SetSelect(fd, COMM_SELECT_READ, idnsRead, NULL, 0); |
bd6a0c8f | 1311 | |
cc192b50 | 1312 | /* BUG (UNRESOLVED) |
1313 | * two code lines after returning from comm_udprecvfrom() | |
1314 | * something overwrites the memory behind the from parameter. | |
1315 | * NO matter where in the stack declaration list above it is placed | |
1316 | * The cause of this is still unknown, however copying the data appears | |
1317 | * to allow it to be passed further without this erasure. | |
1318 | */ | |
b7ac5457 | 1319 | Ip::Address bugbypass; |
62e76326 | 1320 | |
5e263176 FC |
1321 | while (max) { |
1322 | --max; | |
cc192b50 | 1323 | len = comm_udp_recvfrom(fd, rbuf, SQUID_UDP_SO_RCVBUF, 0, bugbypass); |
62e76326 | 1324 | |
cc192b50 | 1325 | from = bugbypass; // BUG BYPASS. see notes above. |
62e76326 | 1326 | |
1327 | if (len == 0) | |
1328 | break; | |
1329 | ||
1330 | if (len < 0) { | |
1331 | if (ignoreErrno(errno)) | |
1332 | break; | |
1333 | ||
1191b93b | 1334 | #if _SQUID_LINUX_ |
62e76326 | 1335 | /* Some Linux systems seem to set the FD for reading and then |
1336 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
1337 | * port unreachable message. */ | |
1338 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
1339 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7b724b86 | 1340 | #endif |
62e76326 | 1341 | |
e0236918 | 1342 | debugs(50, DBG_IMPORTANT, "idnsRead: FD " << fd << " recvfrom: " << xstrerror()); |
62e76326 | 1343 | |
1344 | break; | |
1345 | } | |
1346 | ||
055421ee | 1347 | fd_bytes(fd, len, FD_READ); |
4d6c8504 | 1348 | |
62e76326 | 1349 | assert(N); |
aec55359 | 1350 | ++(*N); |
cc192b50 | 1351 | |
1352 | debugs(78, 3, "idnsRead: FD " << fd << ": received " << len << " bytes from " << from); | |
1353 | ||
1354 | /* BUG: see above. Its here that it becomes apparent that the content of bugbypass is gone. */ | |
9dca980d | 1355 | int nsn = idnsFromKnownNameserver(from); |
62e76326 | 1356 | |
9dca980d AJ |
1357 | if (nsn >= 0) { |
1358 | ++ nameservers[nsn].nreplies; | |
bd6a0c8f HN |
1359 | } |
1360 | ||
1361 | // Before unknown_nameservers check to avoid flooding cache.log on attacks, | |
1362 | // but after the ++ above to keep statistics right. | |
1363 | if (!lru_list.head) | |
1364 | continue; // Don't process replies if there is no pending query. | |
1365 | ||
9dca980d | 1366 | if (nsn < 0 && Config.onoff.ignore_unknown_nameservers) { |
62e76326 | 1367 | static time_t last_warning = 0; |
1368 | ||
1369 | if (squid_curtime - last_warning > 60) { | |
e0236918 | 1370 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from); |
62e76326 | 1371 | last_warning = squid_curtime; |
26ac0430 | 1372 | } else { |
e0236918 | 1373 | debugs(78, DBG_IMPORTANT, "WARNING: Reply from unknown nameserver " << from << " (retrying..." << (squid_curtime-last_warning) << "<=60)" ); |
26ac0430 AJ |
1374 | } |
1375 | continue; | |
62e76326 | 1376 | } |
1377 | ||
9dca980d | 1378 | idnsGrokReply(rbuf, len, nsn); |
7b724b86 | 1379 | } |
1380 | } | |
1381 | ||
7cfc1c9a | 1382 | static void |
1383 | idnsCheckQueue(void *unused) | |
1384 | { | |
1385 | dlink_node *n; | |
0c4fe9e4 | 1386 | dlink_node *p = NULL; |
7cfc1c9a | 1387 | idns_query *q; |
1388 | event_queued = 0; | |
62e76326 | 1389 | |
820ee9fa AJ |
1390 | if (0 == nns) |
1391 | /* name servers went away; reconfiguring or shutting down */ | |
1392 | return; | |
1393 | ||
0c4fe9e4 | 1394 | for (n = lru_list.tail; n; n = p) { |
62e76326 | 1395 | |
820ee9fa | 1396 | p = n->prev; |
733cedc0 | 1397 | q = static_cast<idns_query*>(n->data); |
62e76326 | 1398 | |
820ee9fa | 1399 | /* Anything to process in the queue? */ |
fd0f51c4 | 1400 | if ((time_msec_t)tvSubMsec(q->queue_t, current_time) < Config.Timeout.idns_retransmit ) |
26ac0430 | 1401 | break; |
62e76326 | 1402 | |
33ab4aaf | 1403 | /* Query timer still running? */ |
fd0f51c4 | 1404 | if ((time_msec_t)tvSubMsec(q->sent_t, current_time) < (Config.Timeout.idns_retransmit * 1 << ((q->nsends - 1) / nns))) { |
820ee9fa AJ |
1405 | dlinkDelete(&q->lru, &lru_list); |
1406 | q->queue_t = current_time; | |
1407 | dlinkAdd(q, &q->lru, &lru_list); | |
1408 | continue; | |
1409 | } | |
62e76326 | 1410 | |
91dcbd43 CT |
1411 | debugs(78, 3, "idnsCheckQueue: ID " << q->xact_id << |
1412 | " QID 0x" << std::hex << std::setfill('0') << | |
049441d9 | 1413 | std::setw(4) << q->query_id << ": timeout" ); |
62e76326 | 1414 | |
1415 | dlinkDelete(&q->lru, &lru_list); | |
33ab4aaf | 1416 | q->pending = 0; |
62e76326 | 1417 | |
fd0f51c4 | 1418 | if ((time_msec_t)tvSubMsec(q->start_t, current_time) < Config.Timeout.idns_query) { |
62e76326 | 1419 | idnsSendQuery(q); |
1420 | } else { | |
91dcbd43 | 1421 | debugs(78, 2, "idnsCheckQueue: ID " << q->xact_id << |
049441d9 | 1422 | " QID 0x" << std::hex << q->query_id << |
91dcbd43 | 1423 | " : giving up after " << std::dec << q->nsends << " tries and " << |
26ac0430 | 1424 | std::setw(5)<< std::setprecision(2) << tvSubDsec(q->start_t, current_time) << " seconds"); |
3074b9d1 | 1425 | |
1426 | if (q->rcode != 0) | |
33ab4aaf | 1427 | idnsCallback(q, rfc1035ErrorMessage(q->rcode)); |
3074b9d1 | 1428 | else |
33ab4aaf | 1429 | idnsCallback(q, "Timeout"); |
62e76326 | 1430 | } |
7cfc1c9a | 1431 | } |
62e76326 | 1432 | |
efd900cb | 1433 | idnsTickleQueue(); |
7cfc1c9a | 1434 | } |
1435 | ||
d24ef4e9 | 1436 | static void |
e0d28505 | 1437 | idnsReadVC(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1438 | { |
1439 | nsvc * vc = (nsvc *)data; | |
1440 | ||
1441 | if (flag == COMM_ERR_CLOSING) | |
1442 | return; | |
1443 | ||
1444 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1445 | if (Comm::IsConnOpen(conn)) |
1446 | conn->close(); | |
d24ef4e9 | 1447 | return; |
1448 | } | |
1449 | ||
bd6a0c8f | 1450 | vc->msg->size += len; // XXX should not access -> size directly |
d24ef4e9 | 1451 | |
032785bf | 1452 | if (vc->msg->contentSize() < vc->msglen) { |
abd8f140 AJ |
1453 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1454 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1455 | comm_read(conn, buf+len, vc->msglen - vc->msg->contentSize(), call); | |
d24ef4e9 | 1456 | return; |
1457 | } | |
1458 | ||
dd3fb890 | 1459 | assert(vc->ns < nns); |
e0d28505 | 1460 | debugs(78, 3, HERE << conn << ": received " << vc->msg->contentSize() << " bytes via TCP from " << nameservers[vc->ns].S << "."); |
d24ef4e9 | 1461 | |
e210930b | 1462 | idnsGrokReply(vc->msg->buf, vc->msg->contentSize(), vc->ns); |
2fe7eff9 | 1463 | vc->msg->clean(); |
abd8f140 AJ |
1464 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1465 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1466 | comm_read(conn, (char *)&vc->msglen, 2, call); | |
d24ef4e9 | 1467 | } |
1468 | ||
1469 | static void | |
e0d28505 | 1470 | idnsReadVCHeader(const Comm::ConnectionPointer &conn, char *buf, size_t len, comm_err_t flag, int xerrno, void *data) |
d24ef4e9 | 1471 | { |
1472 | nsvc * vc = (nsvc *)data; | |
1473 | ||
1474 | if (flag == COMM_ERR_CLOSING) | |
1475 | return; | |
1476 | ||
1477 | if (flag != COMM_OK || len <= 0) { | |
80463bb4 AJ |
1478 | if (Comm::IsConnOpen(conn)) |
1479 | conn->close(); | |
d24ef4e9 | 1480 | return; |
1481 | } | |
1482 | ||
1483 | vc->read_msglen += len; | |
1484 | ||
1485 | assert(vc->read_msglen <= 2); | |
1486 | ||
1487 | if (vc->read_msglen < 2) { | |
abd8f140 AJ |
1488 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVCHeader", |
1489 | CommIoCbPtrFun(idnsReadVCHeader, vc)); | |
1490 | comm_read(conn, buf+len, 2 - vc->read_msglen, call); | |
d24ef4e9 | 1491 | return; |
1492 | } | |
1493 | ||
1494 | vc->read_msglen = 0; | |
1495 | ||
1496 | vc->msglen = ntohs(vc->msglen); | |
1497 | ||
2fe7eff9 | 1498 | vc->msg->init(vc->msglen, vc->msglen); |
abd8f140 AJ |
1499 | AsyncCall::Pointer call = commCbCall(5,4, "idnsReadVC", |
1500 | CommIoCbPtrFun(idnsReadVC, vc)); | |
1501 | comm_read(conn, vc->msg->buf, vc->msglen, call); | |
d24ef4e9 | 1502 | } |
1503 | ||
558be27a | 1504 | /* |
1505 | * rcode < 0 indicates an error, rocde >= 0 indicates success | |
1506 | */ | |
1507 | static void | |
1508 | idnsRcodeCount(int rcode, int attempt) | |
1509 | { | |
1510 | if (rcode > 0) | |
62e76326 | 1511 | rcode = 0; |
558be27a | 1512 | else if (rcode < 0) |
62e76326 | 1513 | rcode = -rcode; |
1514 | ||
558be27a | 1515 | if (rcode < MAX_RCODE) |
62e76326 | 1516 | if (attempt < MAX_ATTEMPT) |
95dc7ff4 | 1517 | ++ RcodeMatrix[rcode][attempt]; |
558be27a | 1518 | } |
1519 | ||
7b724b86 | 1520 | /* ====================================================================== */ |
1521 | ||
5f5e883f FC |
1522 | static void |
1523 | idnsRegisterWithCacheManager(void) | |
1524 | { | |
8822ebee | 1525 | Mgr::RegisterAction("idns", "Internal DNS Statistics", idnsStats, 0, 1); |
5f5e883f FC |
1526 | } |
1527 | ||
7b724b86 | 1528 | void |
f64091a7 | 1529 | dnsInit(void) |
7b724b86 | 1530 | { |
1531 | static int init = 0; | |
62e76326 | 1532 | |
d24ef4e9 | 1533 | CBDATA_INIT_TYPE(nsvc); |
63a0e6b7 | 1534 | CBDATA_INIT_TYPE(idns_query); |
d24ef4e9 | 1535 | |
4d6c8504 | 1536 | if (DnsSocketA < 0 && DnsSocketB < 0) { |
049441d9 | 1537 | Ip::Address addrV6; // since we don't want to alter Config.Addrs.udp_* and dont have one of our own. |
62e76326 | 1538 | |
4dd643d5 | 1539 | if (!Config.Addrs.udp_outgoing.isNoAddr()) |
049441d9 | 1540 | addrV6 = Config.Addrs.udp_outgoing; |
62e76326 | 1541 | else |
049441d9 | 1542 | addrV6 = Config.Addrs.udp_incoming; |
62e76326 | 1543 | |
049441d9 | 1544 | Ip::Address addrV4 = addrV6; |
4dd643d5 | 1545 | addrV4.setIPv4(); |
7e07ced1 | 1546 | |
4dd643d5 | 1547 | if (Ip::EnableIpv6 && addrV6.isIPv6()) { |
049441d9 | 1548 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV6); |
4d6c8504 | 1549 | DnsSocketB = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1550 | IPPROTO_UDP, |
049441d9 | 1551 | addrV6, |
04f7fd38 | 1552 | COMM_NONBLOCKING, |
055421ee | 1553 | "DNS Socket IPv6"); |
7e07ced1 | 1554 | } |
4d6c8504 | 1555 | |
4dd643d5 | 1556 | if (addrV4.isIPv4()) { |
049441d9 | 1557 | debugs(78, 2, "idnsInit: attempt open DNS socket to: " << addrV4); |
4d6c8504 | 1558 | DnsSocketA = comm_open_listener(SOCK_DGRAM, |
04f7fd38 | 1559 | IPPROTO_UDP, |
049441d9 | 1560 | addrV4, |
04f7fd38 | 1561 | COMM_NONBLOCKING, |
055421ee | 1562 | "DNS Socket IPv4"); |
7e07ced1 | 1563 | } |
62e76326 | 1564 | |
4d6c8504 | 1565 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1566 | fatal("Could not create a DNS socket"); |
1567 | ||
1568 | /* Ouch... we can't call functions using debug from a debug | |
1569 | * statement. Doing so messes up the internal Debug::level | |
1570 | */ | |
04f7fd38 | 1571 | if (DnsSocketB >= 0) { |
e91e2a72 | 1572 | comm_local_port(DnsSocketB); |
e0236918 | 1573 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV6 << ", FD " << DnsSocketB); |
d841c88d | 1574 | Comm::SetSelect(DnsSocketB, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1575 | } |
04f7fd38 | 1576 | if (DnsSocketA >= 0) { |
e91e2a72 | 1577 | comm_local_port(DnsSocketA); |
e0236918 | 1578 | debugs(78, DBG_IMPORTANT, "DNS Socket created at " << addrV4 << ", FD " << DnsSocketA); |
d841c88d | 1579 | Comm::SetSelect(DnsSocketA, COMM_SELECT_READ, idnsRead, NULL, 0); |
4d6c8504 | 1580 | } |
7b724b86 | 1581 | } |
62e76326 | 1582 | |
efd900cb | 1583 | assert(0 == nns); |
a079e38b AJ |
1584 | idnsAddMDNSNameservers(); |
1585 | bool nsFound = idnsParseNameservers(); | |
7aa9bb3e | 1586 | #if !_SQUID_WINDOWS_ |
62e76326 | 1587 | |
a079e38b AJ |
1588 | if (!nsFound) |
1589 | nsFound = idnsParseResolvConf(); | |
62e76326 | 1590 | |
0e6d05ef | 1591 | #endif |
be266cb2 | 1592 | #if _SQUID_WINDOWS_ |
a079e38b AJ |
1593 | if (!nsFound) |
1594 | nsFound = idnsParseWIN32Registry(); | |
0e6d05ef | 1595 | #endif |
62e76326 | 1596 | |
a079e38b | 1597 | if (!nsFound) { |
e0236918 | 1598 | debugs(78, DBG_IMPORTANT, "Warning: Could not find any nameservers. Trying to use localhost"); |
be266cb2 | 1599 | #if _SQUID_WINDOWS_ |
e0236918 | 1600 | debugs(78, DBG_IMPORTANT, "Please check your TCP-IP settings or /etc/resolv.conf file"); |
0e6d05ef | 1601 | #else |
e0236918 | 1602 | debugs(78, DBG_IMPORTANT, "Please check your /etc/resolv.conf file"); |
0e6d05ef | 1603 | #endif |
29fe9bd5 | 1604 | |
e0236918 | 1605 | debugs(78, DBG_IMPORTANT, "or use the 'dns_nameservers' option in squid.conf."); |
29fe9bd5 | 1606 | idnsAddNameserver("127.0.0.1"); |
1607 | } | |
62e76326 | 1608 | |
7b724b86 | 1609 | if (!init) { |
62e76326 | 1610 | memDataInit(MEM_IDNS_QUERY, "idns_query", sizeof(idns_query), 0); |
62e76326 | 1611 | memset(RcodeMatrix, '\0', sizeof(RcodeMatrix)); |
30abd221 | 1612 | idns_lookup_hash = hash_create((HASHCMP *) strcmp, 103, hash_string); |
95dc7ff4 | 1613 | ++init; |
7b724b86 | 1614 | } |
372fb44e | 1615 | |
e210930b AJ |
1616 | #if WHEN_EDNS_RESPONSES_ARE_PARSED |
1617 | if (Config.onoff.ignore_unknown_nameservers && max_shared_edns > 0) { | |
1618 | debugs(0, DBG_IMPORTANT, "ERROR: cannot negotiate EDNS with unknown nameservers. Disabling"); | |
1619 | max_shared_edns = -1; // disable if we might receive random replies. | |
1620 | } | |
1621 | #endif | |
1622 | ||
372fb44e | 1623 | idnsRegisterWithCacheManager(); |
7b724b86 | 1624 | } |
1625 | ||
1626 | void | |
f64091a7 | 1627 | dnsShutdown(void) |
7b724b86 | 1628 | { |
4d6c8504 | 1629 | if (DnsSocketA < 0 && DnsSocketB < 0) |
62e76326 | 1630 | return; |
1631 | ||
04f7fd38 | 1632 | if (DnsSocketA >= 0 ) { |
4d6c8504 AJ |
1633 | comm_close(DnsSocketA); |
1634 | DnsSocketA = -1; | |
1635 | } | |
62e76326 | 1636 | |
055421ee | 1637 | if (DnsSocketB >= 0 ) { |
4d6c8504 AJ |
1638 | comm_close(DnsSocketB); |
1639 | DnsSocketB = -1; | |
1640 | } | |
62e76326 | 1641 | |
95dc7ff4 | 1642 | for (int i = 0; i < nns; ++i) { |
b26754c4 | 1643 | if (nsvc *vc = nameservers[i].vc) { |
00406b24 AJ |
1644 | if (Comm::IsConnOpen(vc->conn)) |
1645 | vc->conn->close(); | |
b26754c4 | 1646 | } |
1647 | } | |
1648 | ||
dd3fb890 | 1649 | // XXX: vcs are not closed/freed yet and may try to access nameservers[] |
efd900cb | 1650 | idnsFreeNameservers(); |
68836b58 | 1651 | idnsFreeSearchpath(); |
7b724b86 | 1652 | } |
1653 | ||
3074b9d1 | 1654 | static int |
1655 | idnsCachedLookup(const char *key, IDNSCB * callback, void *data) | |
1656 | { | |
1657 | idns_query *q; | |
1658 | ||
1659 | idns_query *old = (idns_query *) hash_lookup(idns_lookup_hash, key); | |
1660 | ||
1661 | if (!old) | |
1662 | return 0; | |
1663 | ||
63a0e6b7 | 1664 | q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1665 | // idns_query is POD so no constructors are called after allocation |
1666 | q->xact_id.change(); | |
049441d9 | 1667 | // no query_id on this instance. |
3074b9d1 | 1668 | |
1669 | q->callback = callback; | |
1670 | ||
1671 | q->callback_data = cbdataReference(data); | |
1672 | ||
1673 | q->queue = old->queue; | |
1674 | ||
1675 | old->queue = q; | |
1676 | ||
1677 | return 1; | |
1678 | } | |
1679 | ||
1680 | static void | |
33ab4aaf | 1681 | idnsStartQuery(idns_query *q, IDNSCB * callback, void *data) |
3074b9d1 | 1682 | { |
33ab4aaf HN |
1683 | q->start_t = current_time; |
1684 | q->callback = callback; | |
1685 | q->callback_data = cbdataReference(data); | |
1686 | ||
049441d9 | 1687 | q->hash.key = q->orig; |
3074b9d1 | 1688 | hash_join(idns_lookup_hash, &q->hash); |
33ab4aaf HN |
1689 | |
1690 | idnsSendQuery(q); | |
3074b9d1 | 1691 | } |
1692 | ||
049441d9 HN |
1693 | static void |
1694 | idnsSendSlaveAAAAQuery(idns_query *master) | |
1695 | { | |
1696 | idns_query *q = cbdataAlloc(idns_query); | |
1697 | memcpy(q->name, master->name, sizeof(q->name)); | |
1698 | memcpy(q->orig, master->orig, sizeof(q->orig)); | |
1699 | q->master = master; | |
1700 | q->query_id = idnsQueryID(); | |
1701 | q->sz = rfc3596BuildAAAAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); | |
33ab4aaf | 1702 | q->start_t = master->start_t; |
049441d9 | 1703 | q->slave = master->slave; |
c7ba545e | 1704 | |
cafb131e | 1705 | debugs(78, 3, HERE << "buf is " << q->sz << " bytes for " << q->name << |
049441d9 HN |
1706 | ", id = 0x" << std::hex << q->query_id); |
1707 | if (!q->sz) { | |
1708 | cbdataFree(q); | |
1709 | return; | |
1710 | } | |
a079e38b | 1711 | idnsCheckMDNS(q); |
049441d9 HN |
1712 | master->slave = q; |
1713 | idnsSendQuery(q); | |
1714 | } | |
1715 | ||
7b724b86 | 1716 | void |
1717 | idnsALookup(const char *name, IDNSCB * callback, void *data) | |
1718 | { | |
32f89713 NH |
1719 | size_t nameLength = strlen(name); |
1720 | ||
1721 | // Prevent buffer overflow on q->name | |
1722 | if (nameLength > NS_MAXDNAME) { | |
1723 | debugs(23, DBG_IMPORTANT, "SECURITY ALERT: DNS name too long to perform lookup: '" << name << "'. see access.log for details."); | |
1724 | callback(data, NULL, 0, "Internal error"); | |
1725 | return; | |
1726 | } | |
3074b9d1 | 1727 | |
1728 | if (idnsCachedLookup(name, callback, data)) | |
1729 | return; | |
1730 | ||
32f89713 | 1731 | idns_query *q = cbdataAlloc(idns_query); |
91dcbd43 CT |
1732 | // idns_query is POD so no constructors are called after allocation |
1733 | q->xact_id.change(); | |
049441d9 | 1734 | q->query_id = idnsQueryID(); |
71952967 | 1735 | |
32f89713 NH |
1736 | int nd = 0; |
1737 | for (unsigned int i = 0; i < nameLength; ++i) | |
68836b58 | 1738 | if (name[i] == '.') |
95dc7ff4 | 1739 | ++nd; |
68836b58 | 1740 | |
32f89713 | 1741 | if (Config.onoff.res_defnames && npc > 0 && name[nameLength-1] != '.') { |
68836b58 | 1742 | q->do_searchpath = 1; |
1743 | } else { | |
1744 | q->do_searchpath = 0; | |
1745 | } | |
1746 | ||
1747 | strcpy(q->orig, name); | |
1748 | strcpy(q->name, q->orig); | |
1749 | ||
1750 | if (q->do_searchpath && nd < ndots) { | |
1751 | q->domain = 0; | |
1752 | strcat(q->name, "."); | |
1753 | strcat(q->name, searchpath[q->domain].domain); | |
bf8fe701 | 1754 | debugs(78, 3, "idnsALookup: searchpath used for " << q->name); |
68836b58 | 1755 | } |
1756 | ||
049441d9 HN |
1757 | // see EDNS notes at top of file why this sends 0 |
1758 | q->sz = rfc3596BuildAQuery(q->name, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); | |
62e76326 | 1759 | |
2041330b | 1760 | if (q->sz < 0) { |
1761 | /* problem with query data -- query not sent */ | |
1762 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1763 | cbdataFree(q); |
2041330b | 1764 | return; |
1765 | } | |
1766 | ||
26ac0430 | 1767 | debugs(78, 3, "idnsALookup: buf is " << q->sz << " bytes for " << q->name << |
049441d9 | 1768 | ", id = 0x" << std::hex << q->query_id); |
aa6c61e3 | 1769 | |
a079e38b | 1770 | idnsCheckMDNS(q); |
33ab4aaf | 1771 | idnsStartQuery(q, callback, data); |
049441d9 HN |
1772 | |
1773 | if (Ip::EnableIpv6) | |
1774 | idnsSendSlaveAAAAQuery(q); | |
1775 | ||
7b724b86 | 1776 | } |
8db71107 | 1777 | |
1778 | void | |
b7ac5457 | 1779 | idnsPTRLookup(const Ip::Address &addr, IDNSCB * callback, void *data) |
8db71107 | 1780 | { |
3074b9d1 | 1781 | idns_query *q; |
1782 | ||
cc192b50 | 1783 | char ip[MAX_IPSTRLEN]; |
1784 | ||
4dd643d5 | 1785 | addr.toStr(ip,MAX_IPSTRLEN); |
3074b9d1 | 1786 | |
63a0e6b7 | 1787 | q = cbdataAlloc(idns_query); |
3074b9d1 | 1788 | |
91dcbd43 CT |
1789 | // idns_query is POD so no constructors are called after allocation |
1790 | q->xact_id.change(); | |
049441d9 | 1791 | q->query_id = idnsQueryID(); |
71952967 | 1792 | |
4dd643d5 | 1793 | if (addr.isIPv6()) { |
cc192b50 | 1794 | struct in6_addr addr6; |
4dd643d5 | 1795 | addr.getInAddr(addr6); |
546ae352 | 1796 | q->sz = rfc3596BuildPTRQuery6(addr6, q->buf, sizeof(q->buf), q->query_id, &q->query, Config.dns.packet_max); |
055421ee | 1797 | } else { |
cc192b50 | 1798 | struct in_addr addr4; |
4dd643d5 | 1799 | addr.getInAddr(addr4); |
e210930b | 1800 | // see EDNS notes at top of file why this sends 0 |
546ae352 | 1801 | q->sz = rfc3596BuildPTRQuery4(addr4, q->buf, sizeof(q->buf), q->query_id, &q->query, 0); |
cc192b50 | 1802 | } |
1803 | ||
26ac0430 | 1804 | if (q->sz < 0) { |
2041330b | 1805 | /* problem with query data -- query not sent */ |
1806 | callback(data, NULL, 0, "Internal error"); | |
63a0e6b7 | 1807 | cbdataFree(q); |
2041330b | 1808 | return; |
1809 | } | |
1810 | ||
37f3da43 | 1811 | if (idnsCachedLookup(q->query.name, callback, data)) { |
26ac0430 AJ |
1812 | cbdataFree(q); |
1813 | return; | |
37f3da43 | 1814 | } |
1815 | ||
26ac0430 | 1816 | debugs(78, 3, "idnsPTRLookup: buf is " << q->sz << " bytes for " << ip << |
049441d9 | 1817 | ", id = 0x" << std::hex << q->query_id); |
3074b9d1 | 1818 | |
a079e38b | 1819 | q->permit_mdns = true; |
33ab4aaf | 1820 | idnsStartQuery(q, callback, data); |
8db71107 | 1821 | } |
eb824054 | 1822 | |
59ad6d31 | 1823 | #if SQUID_SNMP |
3c573763 | 1824 | /* |
1825 | * The function to return the DNS via SNMP | |
1826 | */ | |
1827 | variable_list * | |
f64091a7 | 1828 | snmp_netDnsFn(variable_list * Var, snint * ErrP) |
3c573763 | 1829 | { |
1830 | int i, n = 0; | |
1831 | variable_list *Answer = NULL; | |
6a644e75 AJ |
1832 | MemBuf tmp; |
1833 | debugs(49, 5, "snmp_netDnsFn: Processing request: " << snmpDebugOid(Var->name, Var->name_length, tmp)); | |
3c573763 | 1834 | *ErrP = SNMP_ERR_NOERROR; |
62e76326 | 1835 | |
3c573763 | 1836 | switch (Var->name[LEN_SQ_NET + 1]) { |
62e76326 | 1837 | |
3c573763 | 1838 | case DNS_REQ: |
62e76326 | 1839 | |
95dc7ff4 | 1840 | for (i = 0; i < nns; ++i) |
62e76326 | 1841 | n += nameservers[i].nqueries; |
1842 | ||
1843 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1844 | n, | |
1845 | SMI_COUNTER32); | |
1846 | ||
1847 | break; | |
1848 | ||
3c573763 | 1849 | case DNS_REP: |
95dc7ff4 | 1850 | for (i = 0; i < nns; ++i) |
62e76326 | 1851 | n += nameservers[i].nreplies; |
1852 | ||
1853 | Answer = snmp_var_new_integer(Var->name, Var->name_length, | |
1854 | n, | |
1855 | SMI_COUNTER32); | |
1856 | ||
1857 | break; | |
1858 | ||
3c573763 | 1859 | case DNS_SERVERS: |
62e76326 | 1860 | Answer = snmp_var_new_integer(Var->name, Var->name_length, |
e494f5e9 | 1861 | nns, |
62e76326 | 1862 | SMI_COUNTER32); |
1863 | ||
1864 | break; | |
1865 | ||
3c573763 | 1866 | default: |
62e76326 | 1867 | *ErrP = SNMP_ERR_NOSUCHNAME; |
1868 | ||
1869 | break; | |
3c573763 | 1870 | } |
62e76326 | 1871 | |
3c573763 | 1872 | return Answer; |
1873 | } | |
62e76326 | 1874 | |
3c573763 | 1875 | #endif /*SQUID_SNMP */ |
f64091a7 | 1876 | #endif /* USE_DNSHELPER */ |