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9cef6668 | 1 | /* |
cc192b50 | 2 | * DEBUG: section 12 Internet Cache Protocol (ICP) |
9cef6668 | 3 | * AUTHOR: Duane Wessels |
4 | * | |
2b6662ba | 5 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
9cef6668 | 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. | |
9cef6668 | 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 | * |
9cef6668 | 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 | * |
9cef6668 | 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 | ||
63be0a78 | 33 | /** |
34 | \defgroup ServerProtocolICPInternal2 ICPv2 Internals | |
35 | \ingroup ServerProtocolICPAPI | |
36 | */ | |
37 | ||
7a2f978b | 38 | #include "squid.h" |
e6ccf245 | 39 | #include "Store.h" |
063dc1eb | 40 | #include "comm.h" |
e6ccf245 | 41 | #include "ICP.h" |
528b2c61 | 42 | #include "HttpRequest.h" |
c0941a6a AR |
43 | #include "acl/FilledChecklist.h" |
44 | #include "acl/Acl.h" | |
450e0c10 | 45 | #include "AccessLogEntry.h" |
d295d770 | 46 | #include "wordlist.h" |
985c86bc | 47 | #include "SquidTime.h" |
bef81ea5 | 48 | #include "SwapDir.h" |
9b5c4a9a | 49 | #include "icmp/net_db.h" |
9837e5f0 | 50 | #include "ip/IpAddress.h" |
1fa9b1a7 | 51 | #include "rfc1738.h" |
7a2f978b | 52 | |
63be0a78 | 53 | /// \ingroup ServerProtocolICPInternal2 |
b7ac5457 | 54 | static void icpLogIcp(const Ip::Address &, log_type, int, const char *, int); |
62e76326 | 55 | |
63be0a78 | 56 | /// \ingroup ServerProtocolICPInternal2 |
b7ac5457 | 57 | static void icpHandleIcpV2(int, Ip::Address &, char *, int); |
63be0a78 | 58 | |
59 | /// \ingroup ServerProtocolICPInternal2 | |
071a3ae7 | 60 | static void icpCount(void *, int, size_t, int); |
17b6e784 | 61 | |
63be0a78 | 62 | /** |
63 | \ingroup ServerProtocolICPInternal2 | |
48382032 | 64 | * IcpQueueHead is global so comm_incoming() knows whether or not |
65 | * to call icpUdpSendQueue. | |
66 | */ | |
d4cb310b | 67 | static icpUdpData *IcpQueueHead = NULL; |
63be0a78 | 68 | /// \ingroup ServerProtocolICPInternal2 |
69 | static icpUdpData *IcpQueueTail = NULL; | |
7a2f978b | 70 | |
e1f7507e | 71 | /// \ingroup ServerProtocolICPInternal2 |
b7ac5457 | 72 | Ip::Address theOutICPAddr; |
e1f7507e | 73 | |
e6ccf245 | 74 | /* icp_common_t */ |
75 | _icp_common_t::_icp_common_t() : opcode(ICP_INVALID), version(0), length(0), reqnum(0), flags(0), pad(0), shostid(0) | |
62e76326 | 76 | {} |
e6ccf245 | 77 | |
78 | _icp_common_t::_icp_common_t(char *buf, unsigned int len) | |
79 | { | |
80 | if (len < sizeof(_icp_common_t)) { | |
62e76326 | 81 | /* mark as invalid */ |
82 | length = len + 1; | |
83 | return; | |
e6ccf245 | 84 | } |
62e76326 | 85 | |
e6ccf245 | 86 | xmemcpy(this, buf, sizeof(icp_common_t)); |
87 | /* | |
88 | * Convert network order sensitive fields | |
89 | */ | |
90 | length = ntohs(length); | |
91 | reqnum = ntohl(reqnum); | |
92 | flags = ntohl(flags); | |
93 | pad = ntohl(pad); | |
94 | } | |
95 | ||
96 | icp_opcode | |
97 | _icp_common_t::getOpCode() const | |
98 | { | |
99 | if (opcode > (char)ICP_END) | |
62e76326 | 100 | return ICP_INVALID; |
101 | ||
e6ccf245 | 102 | return (icp_opcode)opcode; |
103 | } | |
104 | ||
105 | /* ICPState */ | |
106 | ||
63be0a78 | 107 | ICPState::ICPState(icp_common_t &aHeader, HttpRequest *aRequest): |
26ac0430 AJ |
108 | header(aHeader), |
109 | request(HTTPMSGLOCK(aRequest)), | |
62e76326 | 110 | fd(-1), |
111 | url(NULL) | |
112 | {} | |
e6ccf245 | 113 | |
114 | ICPState::~ICPState() | |
115 | { | |
116 | safe_free(url); | |
f72fb56b | 117 | HTTPMSGUNLOCK(request); |
e6ccf245 | 118 | } |
119 | ||
120 | ||
121 | /* End ICPState */ | |
122 | ||
123 | /* ICP2State */ | |
62e76326 | 124 | |
63be0a78 | 125 | /// \ingroup ServerProtocolICPInternal2 |
126 | class ICP2State : public ICPState, public StoreClient | |
62e76326 | 127 | { |
128 | ||
129 | public: | |
f72fb56b | 130 | ICP2State(icp_common_t & aHeader, HttpRequest *aRequest): |
26ac0430 | 131 | ICPState(aHeader, aRequest),rtt(0),src_rtt(0),flags(0) {} |
62e76326 | 132 | |
133 | ~ICP2State(); | |
e6ccf245 | 134 | void created(StoreEntry * newEntry); |
135 | ||
136 | int rtt; | |
137 | int src_rtt; | |
138 | u_int32_t flags; | |
139 | }; | |
140 | ||
63be0a78 | 141 | ICP2State::~ICP2State() |
62e76326 | 142 | {} |
e6ccf245 | 143 | |
144 | void | |
63be0a78 | 145 | ICP2State::created(StoreEntry *newEntry) |
e6ccf245 | 146 | { |
147 | StoreEntry *entry = newEntry->isNull () ? NULL : newEntry; | |
bf8fe701 | 148 | debugs(12, 5, "icpHandleIcpV2: OPCODE " << icp_opcode_str[header.opcode]); |
e6ccf245 | 149 | icp_opcode codeToSend; |
62e76326 | 150 | |
e6ccf245 | 151 | if (icpCheckUdpHit(entry, request)) { |
62e76326 | 152 | codeToSend = ICP_HIT; |
e6ccf245 | 153 | } else { |
9b5c4a9a | 154 | #if USE_ICMP |
62e76326 | 155 | if (Config.onoff.test_reachability && rtt == 0) { |
cc192b50 | 156 | if ((rtt = netdbHostRtt(request->GetHost())) == 0) |
157 | netdbPingSite(request->GetHost()); | |
62e76326 | 158 | } |
9b5c4a9a | 159 | #endif /* USE_ICMP */ |
62e76326 | 160 | |
161 | if (icpGetCommonOpcode() != ICP_ERR) | |
162 | codeToSend = icpGetCommonOpcode(); | |
163 | else if (Config.onoff.test_reachability && rtt == 0) | |
164 | codeToSend = ICP_MISS_NOFETCH; | |
165 | else | |
166 | codeToSend = ICP_MISS; | |
e6ccf245 | 167 | } |
62e76326 | 168 | |
cc192b50 | 169 | icpCreateAndSend(codeToSend, flags, url, header.reqnum, src_rtt, fd, from); |
e6ccf245 | 170 | delete this; |
171 | } | |
172 | ||
173 | /* End ICP2State */ | |
174 | ||
63be0a78 | 175 | /// \ingroup ServerProtocolICPInternal2 |
7a2f978b | 176 | static void |
b7ac5457 | 177 | icpLogIcp(const Ip::Address &caddr, log_type logcode, int len, const char *url, int delay) |
7a2f978b | 178 | { |
7a2f978b | 179 | AccessLogEntry al; |
62e76326 | 180 | |
96c617da | 181 | if (LOG_TAG_NONE == logcode) |
62e76326 | 182 | return; |
183 | ||
071a3ae7 | 184 | if (LOG_ICP_QUERY == logcode) |
62e76326 | 185 | return; |
186 | ||
17b6e784 | 187 | clientdbUpdate(caddr, logcode, PROTO_ICP, len); |
62e76326 | 188 | |
7a2f978b | 189 | if (!Config.onoff.log_udp) |
62e76326 | 190 | return; |
191 | ||
27cd7235 | 192 | al.icp.opcode = ICP_QUERY; |
62e76326 | 193 | |
7a2f978b | 194 | al.url = url; |
62e76326 | 195 | |
17b6e784 | 196 | al.cache.caddr = caddr; |
62e76326 | 197 | |
1a86db31 | 198 | al.cache.replySize = len; |
62e76326 | 199 | |
17b6e784 | 200 | al.cache.code = logcode; |
62e76326 | 201 | |
17b6e784 | 202 | al.cache.msec = delay; |
62e76326 | 203 | |
7684c4b1 | 204 | accessLogLog(&al, NULL); |
7a2f978b | 205 | } |
206 | ||
63be0a78 | 207 | /// \ingroup ServerProtocolICPInternal2 |
48382032 | 208 | void |
17b6e784 | 209 | icpUdpSendQueue(int fd, void *unused) |
7a2f978b | 210 | { |
17b6e784 | 211 | icpUdpData *q; |
7a2f978b | 212 | int x; |
17b6e784 | 213 | int delay; |
62e76326 | 214 | |
48382032 | 215 | while ((q = IcpQueueHead) != NULL) { |
62e76326 | 216 | delay = tvSubUsec(q->queue_time, current_time); |
217 | /* increment delay to prevent looping */ | |
cc192b50 | 218 | x = icpUdpSend(fd, q->address, (icp_common_t *) q->msg, q->logcode, ++delay); |
62e76326 | 219 | IcpQueueHead = q->next; |
220 | safe_free(q); | |
221 | ||
222 | if (x < 0) | |
223 | break; | |
7a2f978b | 224 | } |
225 | } | |
226 | ||
e6ccf245 | 227 | _icp_common_t * |
228 | _icp_common_t::createMessage( | |
7a2f978b | 229 | icp_opcode opcode, |
230 | int flags, | |
231 | const char *url, | |
232 | int reqnum, | |
233 | int pad) | |
234 | { | |
235 | char *buf = NULL; | |
236 | icp_common_t *headerp = NULL; | |
237 | char *urloffset = NULL; | |
238 | int buf_len; | |
239 | buf_len = sizeof(icp_common_t) + strlen(url) + 1; | |
62e76326 | 240 | |
27cd7235 | 241 | if (opcode == ICP_QUERY) |
62e76326 | 242 | buf_len += sizeof(u_int32_t); |
243 | ||
e6ccf245 | 244 | buf = (char *) xcalloc(buf_len, 1); |
62e76326 | 245 | |
7a2f978b | 246 | headerp = (icp_common_t *) (void *) buf; |
62e76326 | 247 | |
79d39a72 | 248 | headerp->opcode = (char) opcode; |
62e76326 | 249 | |
7a2f978b | 250 | headerp->version = ICP_VERSION_CURRENT; |
62e76326 | 251 | |
a9245686 | 252 | headerp->length = (u_int16_t) htons(buf_len); |
62e76326 | 253 | |
7a2f978b | 254 | headerp->reqnum = htonl(reqnum); |
62e76326 | 255 | |
7a2f978b | 256 | headerp->flags = htonl(flags); |
62e76326 | 257 | |
7a2f978b | 258 | headerp->pad = htonl(pad); |
62e76326 | 259 | |
cc192b50 | 260 | theOutICPAddr.GetInAddr( *((struct in_addr*)&headerp->shostid) ); |
62e76326 | 261 | |
7a2f978b | 262 | urloffset = buf + sizeof(icp_common_t); |
62e76326 | 263 | |
27cd7235 | 264 | if (opcode == ICP_QUERY) |
62e76326 | 265 | urloffset += sizeof(u_int32_t); |
266 | ||
7a2f978b | 267 | xmemcpy(urloffset, url, strlen(url)); |
62e76326 | 268 | |
e6ccf245 | 269 | return (icp_common_t *)buf; |
7a2f978b | 270 | } |
271 | ||
17b6e784 | 272 | int |
7a2f978b | 273 | icpUdpSend(int fd, |
b7ac5457 | 274 | const Ip::Address &to, |
62e76326 | 275 | icp_common_t * msg, |
276 | log_type logcode, | |
277 | int delay) | |
7a2f978b | 278 | { |
17b6e784 | 279 | icpUdpData *queue; |
8e68922c | 280 | int x; |
17b6e784 | 281 | int len; |
282 | len = (int) ntohs(msg->length); | |
bf8fe701 | 283 | debugs(12, 5, "icpUdpSend: FD " << fd << " sending " << |
cc192b50 | 284 | icp_opcode_str[msg->opcode] << ", " << len << " bytes to " << to); |
bf8fe701 | 285 | |
cc192b50 | 286 | x = comm_udp_sendto(fd, to, msg, len); |
62e76326 | 287 | |
26ac0430 | 288 | if (x >= 0) { |
62e76326 | 289 | /* successfully written */ |
cc192b50 | 290 | icpLogIcp(to, logcode, len, (char *) (msg + 1), delay); |
62e76326 | 291 | icpCount(msg, SENT, (size_t) len, delay); |
292 | safe_free(msg); | |
26ac0430 | 293 | } else if (0 == delay) { |
62e76326 | 294 | /* send failed, but queue it */ |
295 | queue = (icpUdpData *) xcalloc(1, sizeof(icpUdpData)); | |
cc192b50 | 296 | queue->address = to; |
62e76326 | 297 | queue->msg = msg; |
298 | queue->len = (int) ntohs(msg->length); | |
299 | queue->queue_time = current_time; | |
300 | queue->logcode = logcode; | |
301 | ||
302 | if (IcpQueueHead == NULL) { | |
303 | IcpQueueHead = queue; | |
304 | IcpQueueTail = queue; | |
305 | } else if (IcpQueueTail == IcpQueueHead) { | |
306 | IcpQueueTail = queue; | |
307 | IcpQueueHead->next = queue; | |
308 | } else { | |
309 | IcpQueueTail->next = queue; | |
310 | IcpQueueTail = queue; | |
311 | } | |
312 | ||
313 | commSetSelect(fd, COMM_SELECT_WRITE, icpUdpSendQueue, NULL, 0); | |
314 | statCounter.icp.replies_queued++; | |
26ac0430 | 315 | } else { |
62e76326 | 316 | /* don't queue it */ |
317 | statCounter.icp.replies_dropped++; | |
8e68922c | 318 | } |
62e76326 | 319 | |
17b6e784 | 320 | return x; |
7a2f978b | 321 | } |
322 | ||
323 | int | |
190154cf | 324 | icpCheckUdpHit(StoreEntry * e, HttpRequest * request) |
7a2f978b | 325 | { |
326 | if (e == NULL) | |
62e76326 | 327 | return 0; |
328 | ||
3900307b | 329 | if (!e->validToSend()) |
62e76326 | 330 | return 0; |
331 | ||
7a2f978b | 332 | if (Config.onoff.icp_hit_stale) |
62e76326 | 333 | return 1; |
334 | ||
829a9357 | 335 | if (refreshCheckICP(e, request)) |
62e76326 | 336 | return 0; |
337 | ||
7a2f978b | 338 | return 1; |
339 | } | |
7a2f978b | 340 | |
63be0a78 | 341 | /** |
bef81ea5 | 342 | * This routine selects an ICP opcode for ICP misses. |
63be0a78 | 343 | * |
344 | \retval ICP_ERR no opcode selected here | |
345 | \retval ICP_MISS_NOFETCH store is rebuilding, no fetch is possible yet | |
bef81ea5 | 346 | */ |
e6ccf245 | 347 | icp_opcode |
348 | icpGetCommonOpcode() | |
349 | { | |
bef81ea5 | 350 | /* if store is rebuilding, return a UDP_MISS_NOFETCH */ |
62e76326 | 351 | |
871899ca | 352 | if ((StoreController::store_dirs_rebuilding && opt_reload_hit_only) || |
62e76326 | 353 | hit_only_mode_until > squid_curtime) { |
354 | return ICP_MISS_NOFETCH; | |
e6ccf245 | 355 | } |
62e76326 | 356 | |
e6ccf245 | 357 | return ICP_ERR; |
358 | } | |
359 | ||
360 | log_type | |
361 | icpLogFromICPCode(icp_opcode opcode) | |
362 | { | |
363 | if (opcode == ICP_ERR) | |
62e76326 | 364 | return LOG_UDP_INVALID; |
365 | ||
e6ccf245 | 366 | if (opcode == ICP_DENIED) |
62e76326 | 367 | return LOG_UDP_DENIED; |
368 | ||
e6ccf245 | 369 | if (opcode == ICP_HIT) |
62e76326 | 370 | return LOG_UDP_HIT; |
371 | ||
e6ccf245 | 372 | if (opcode == ICP_MISS) |
62e76326 | 373 | return LOG_UDP_MISS; |
374 | ||
e6ccf245 | 375 | if (opcode == ICP_MISS_NOFETCH) |
62e76326 | 376 | return LOG_UDP_MISS_NOFETCH; |
377 | ||
e6ccf245 | 378 | fatal("expected ICP opcode\n"); |
62e76326 | 379 | |
e6ccf245 | 380 | return LOG_UDP_INVALID; |
381 | } | |
382 | ||
383 | void | |
b7ac5457 | 384 | icpCreateAndSend(icp_opcode opcode, int flags, char const *url, int reqnum, int pad, int fd, const Ip::Address &from) |
e6ccf245 | 385 | { |
386 | icp_common_t *reply = _icp_common_t::createMessage(opcode, flags, url, reqnum, pad); | |
387 | icpUdpSend(fd, from, reply, icpLogFromICPCode(opcode), 0); | |
388 | } | |
389 | ||
390 | void | |
b7ac5457 | 391 | icpDenyAccess(Ip::Address &from, char *url, int reqnum, int fd) |
e6ccf245 | 392 | { |
cc192b50 | 393 | debugs(12, 2, "icpDenyAccess: Access Denied for " << from << " by " << AclMatchedName << "."); |
62e76326 | 394 | |
26ac0430 | 395 | if (clientdbCutoffDenied(from)) { |
62e76326 | 396 | /* |
397 | * count this DENIED query in the clientdb, even though | |
398 | * we're not sending an ICP reply... | |
399 | */ | |
cc192b50 | 400 | clientdbUpdate(from, LOG_UDP_DENIED, PROTO_ICP, 0); |
26ac0430 | 401 | } else { |
62e76326 | 402 | icpCreateAndSend(ICP_DENIED, 0, url, reqnum, 0, fd, from); |
e6ccf245 | 403 | } |
404 | } | |
405 | ||
406 | int | |
b7ac5457 | 407 | icpAccessAllowed(Ip::Address &from, HttpRequest * icp_request) |
7a2f978b | 408 | { |
b50e327b AJ |
409 | /* absent an explicit allow, we deny all */ |
410 | if (!Config.accessList.icp) | |
411 | return 0; | |
412 | ||
c0941a6a | 413 | ACLFilledChecklist checklist(Config.accessList.icp, icp_request, NULL); |
cc192b50 | 414 | checklist.src_addr = from; |
415 | checklist.my_addr.SetNoAddr(); | |
b448c119 | 416 | int result = checklist.fastCheck(); |
b448c119 | 417 | return result; |
e6ccf245 | 418 | } |
419 | ||
420 | char const * | |
421 | icpGetUrlToSend(char *url) | |
422 | { | |
423 | if (strpbrk(url, w_space)) | |
62e76326 | 424 | return rfc1738_escape(url); |
e6ccf245 | 425 | else |
62e76326 | 426 | return url; |
e6ccf245 | 427 | } |
428 | ||
190154cf | 429 | HttpRequest * |
b7ac5457 | 430 | icpGetRequest(char *url, int reqnum, int fd, Ip::Address &from) |
e6ccf245 | 431 | { |
26ac0430 | 432 | if (strpbrk(url, w_space)) { |
62e76326 | 433 | url = rfc1738_escape(url); |
434 | icpCreateAndSend(ICP_ERR, 0, rfc1738_escape(url), reqnum, 0, fd, from); | |
435 | return NULL; | |
e6ccf245 | 436 | } |
62e76326 | 437 | |
190154cf | 438 | HttpRequest *result; |
62e76326 | 439 | |
c21ad0f5 | 440 | if ((result = HttpRequest::CreateFromUrl(url)) == NULL) |
62e76326 | 441 | icpCreateAndSend(ICP_ERR, 0, url, reqnum, 0, fd, from); |
442 | ||
e6ccf245 | 443 | return result; |
444 | ||
445 | } | |
446 | ||
447 | static void | |
b7ac5457 | 448 | doV2Query(int fd, Ip::Address &from, char *buf, icp_common_t header) |
e6ccf245 | 449 | { |
450 | int rtt = 0; | |
7a2f978b | 451 | int src_rtt = 0; |
a9245686 | 452 | u_int32_t flags = 0; |
e6ccf245 | 453 | /* We have a valid packet */ |
454 | char *url = buf + sizeof(icp_common_t) + sizeof(u_int32_t); | |
cc192b50 | 455 | HttpRequest *icp_request = icpGetRequest(url, header.reqnum, fd, from); |
62e76326 | 456 | |
e6ccf245 | 457 | if (!icp_request) |
62e76326 | 458 | return; |
459 | ||
6dd9f4bd | 460 | HTTPMSGLOCK(icp_request); |
319bf5a7 | 461 | |
26ac0430 | 462 | if (!icpAccessAllowed(from, icp_request)) { |
cc192b50 | 463 | icpDenyAccess(from, url, header.reqnum, fd); |
6dd9f4bd | 464 | HTTPMSGUNLOCK(icp_request); |
62e76326 | 465 | return; |
e6ccf245 | 466 | } |
9b5c4a9a | 467 | #if USE_ICMP |
26ac0430 | 468 | if (header.flags & ICP_FLAG_SRC_RTT) { |
cc192b50 | 469 | rtt = netdbHostRtt(icp_request->GetHost()); |
470 | int hops = netdbHostHops(icp_request->GetHost()); | |
62e76326 | 471 | src_rtt = ((hops & 0xFFFF) << 16) | (rtt & 0xFFFF); |
472 | ||
473 | if (rtt) | |
474 | flags |= ICP_FLAG_SRC_RTT; | |
e6ccf245 | 475 | } |
9b5c4a9a | 476 | #endif /* USE_ICMP */ |
62e76326 | 477 | |
e6ccf245 | 478 | /* The peer is allowed to use this cache */ |
f72fb56b | 479 | ICP2State *state = new ICP2State (header, icp_request); |
62e76326 | 480 | |
e6ccf245 | 481 | state->fd = fd; |
62e76326 | 482 | |
e6ccf245 | 483 | state->from = from; |
62e76326 | 484 | |
e6ccf245 | 485 | state->url = xstrdup (url); |
62e76326 | 486 | |
e6ccf245 | 487 | state->flags = flags; |
62e76326 | 488 | |
e6ccf245 | 489 | state->rtt = rtt; |
62e76326 | 490 | |
e6ccf245 | 491 | state->src_rtt = src_rtt; |
62e76326 | 492 | |
3b13a8fd | 493 | StoreEntry::getPublic (state, url, METHOD_GET); |
319bf5a7 | 494 | |
6dd9f4bd | 495 | HTTPMSGUNLOCK(icp_request); |
e6ccf245 | 496 | } |
497 | ||
498 | void | |
b7ac5457 | 499 | _icp_common_t::handleReply(char *buf, Ip::Address &from) |
e6ccf245 | 500 | { |
26ac0430 | 501 | if (neighbors_do_private_keys && reqnum == 0) { |
cc192b50 | 502 | debugs(12, 0, "icpHandleIcpV2: Neighbor " << from << " returned reqnum = 0"); |
bf8fe701 | 503 | debugs(12, 0, "icpHandleIcpV2: Disabling use of private keys"); |
62e76326 | 504 | neighbors_do_private_keys = 0; |
e6ccf245 | 505 | } |
62e76326 | 506 | |
e6ccf245 | 507 | char *url = buf + sizeof(icp_common_t); |
cc192b50 | 508 | debugs(12, 3, "icpHandleIcpV2: " << icp_opcode_str[opcode] << " from " << from << " for '" << url << "'"); |
bf8fe701 | 509 | |
e6ccf245 | 510 | const cache_key *key = icpGetCacheKey(url, (int) reqnum); |
511 | /* call neighborsUdpAck even if ping_status != PING_WAITING */ | |
512 | neighborsUdpAck(key, this, from); | |
513 | } | |
514 | ||
515 | static void | |
b7ac5457 | 516 | icpHandleIcpV2(int fd, Ip::Address &from, char *buf, int len) |
e6ccf245 | 517 | { |
26ac0430 | 518 | if (len <= 0) { |
bf8fe701 | 519 | debugs(12, 3, "icpHandleIcpV2: ICP message is too small"); |
62e76326 | 520 | return; |
e6ccf245 | 521 | } |
62e76326 | 522 | |
e6ccf245 | 523 | icp_common_t header(buf, len); |
7b83b3d9 | 524 | /* |
525 | * Length field should match the number of bytes read | |
526 | */ | |
62e76326 | 527 | |
26ac0430 | 528 | if (len != header.length) { |
bf8fe701 | 529 | debugs(12, 3, "icpHandleIcpV2: ICP message is too small"); |
62e76326 | 530 | return; |
7b83b3d9 | 531 | } |
62e76326 | 532 | |
26ac0430 | 533 | switch (header.opcode) { |
62e76326 | 534 | |
27cd7235 | 535 | case ICP_QUERY: |
62e76326 | 536 | /* We have a valid packet */ |
537 | doV2Query(fd, from, buf, header); | |
538 | break; | |
7a2f978b | 539 | |
27cd7235 | 540 | case ICP_HIT: |
62e76326 | 541 | |
27cd7235 | 542 | case ICP_DECHO: |
62e76326 | 543 | |
27cd7235 | 544 | case ICP_MISS: |
62e76326 | 545 | |
27cd7235 | 546 | case ICP_DENIED: |
62e76326 | 547 | |
27cd7235 | 548 | case ICP_MISS_NOFETCH: |
cc192b50 | 549 | header.handleReply(buf, from); |
62e76326 | 550 | break; |
7a2f978b | 551 | |
27cd7235 | 552 | case ICP_INVALID: |
62e76326 | 553 | |
27cd7235 | 554 | case ICP_ERR: |
62e76326 | 555 | break; |
7a2f978b | 556 | |
557 | default: | |
cc192b50 | 558 | debugs(12, 0, "icpHandleIcpV2: UNKNOWN OPCODE: " << header.opcode << " from " << from); |
bf8fe701 | 559 | |
62e76326 | 560 | break; |
7a2f978b | 561 | } |
7a2f978b | 562 | } |
563 | ||
564 | #ifdef ICP_PKT_DUMP | |
565 | static void | |
566 | icpPktDump(icp_common_t * pkt) | |
567 | { | |
b7ac5457 | 568 | Ip::Address a; |
7a2f978b | 569 | |
4a7a3d56 | 570 | debugs(12, 9, "opcode: " << std::setw(3) << pkt->opcode << " " << icp_opcode_str[pkt->opcode]); |
571 | debugs(12, 9, "version: "<< std::left << std::setw(8) << pkt->version); | |
572 | debugs(12, 9, "length: "<< std::left << std::setw(8) << ntohs(pkt->length)); | |
bf8fe701 | 573 | debugs(12, 9, "reqnum: "<< std::left << std::setw(8) << ntohl(pkt->reqnum)); |
574 | debugs(12, 9, "flags: "<< std::left << std::hex << std::setw(8) << ntohl(pkt->flags)); | |
cc192b50 | 575 | a = (struct in_addr)pkt->shostid; |
576 | debugs(12, 9, "shostid: " << a ); | |
bf8fe701 | 577 | debugs(12, 9, "payload: " << (char *) pkt + sizeof(icp_common_t)); |
7a2f978b | 578 | } |
62e76326 | 579 | |
7a2f978b | 580 | #endif |
581 | ||
582 | void | |
ba4f8e5a | 583 | icpHandleUdp(int sock, void *data) |
7a2f978b | 584 | { |
d193a436 | 585 | int *N = &incoming_sockets_accepted; |
62e76326 | 586 | |
b7ac5457 | 587 | Ip::Address from; |
7a2f978b | 588 | LOCAL_ARRAY(char, buf, SQUID_UDP_SO_RCVBUF); |
0b6d1955 | 589 | int len; |
7a2f978b | 590 | int icp_version; |
309ad3b6 | 591 | int max = INCOMING_ICP_MAX; |
7a2f978b | 592 | commSetSelect(sock, COMM_SELECT_READ, icpHandleUdp, NULL, 0); |
62e76326 | 593 | |
5b0aaa58 | 594 | while (max--) { |
62e76326 | 595 | len = comm_udp_recvfrom(sock, |
596 | buf, | |
597 | SQUID_UDP_SO_RCVBUF - 1, | |
598 | 0, | |
cc192b50 | 599 | from); |
62e76326 | 600 | |
601 | if (len == 0) | |
602 | break; | |
603 | ||
604 | if (len < 0) { | |
605 | if (ignoreErrno(errno)) | |
606 | break; | |
607 | ||
7a2f978b | 608 | #ifdef _SQUID_LINUX_ |
62e76326 | 609 | /* Some Linux systems seem to set the FD for reading and then |
610 | * return ECONNREFUSED when sendto() fails and generates an ICMP | |
611 | * port unreachable message. */ | |
612 | /* or maybe an EHOSTUNREACH "No route to host" message */ | |
613 | if (errno != ECONNREFUSED && errno != EHOSTUNREACH) | |
7a2f978b | 614 | #endif |
62e76326 | 615 | |
bf8fe701 | 616 | debugs(50, 1, "icpHandleUdp: FD " << sock << " recvfrom: " << xstrerror()); |
62e76326 | 617 | |
618 | break; | |
619 | } | |
620 | ||
621 | (*N)++; | |
622 | icpCount(buf, RECV, (size_t) len, 0); | |
623 | buf[len] = '\0'; | |
bf8fe701 | 624 | debugs(12, 4, "icpHandleUdp: FD " << sock << ": received " << |
cc192b50 | 625 | (unsigned long int)len << " bytes from " << from); |
bf8fe701 | 626 | |
7a2f978b | 627 | #ifdef ICP_PACKET_DUMP |
62e76326 | 628 | |
629 | icpPktDump(buf); | |
7a2f978b | 630 | #endif |
62e76326 | 631 | |
0b6d1955 | 632 | if ((size_t) len < sizeof(icp_common_t)) { |
bf8fe701 | 633 | debugs(12, 4, "icpHandleUdp: Ignoring too-small UDP packet"); |
62e76326 | 634 | break; |
635 | } | |
636 | ||
637 | icp_version = (int) buf[1]; /* cheat! */ | |
638 | ||
639 | if (icp_version == ICP_VERSION_2) | |
640 | icpHandleIcpV2(sock, from, buf, len); | |
641 | else if (icp_version == ICP_VERSION_3) | |
642 | icpHandleIcpV3(sock, from, buf, len); | |
643 | else | |
26ac0430 AJ |
644 | debugs(12, 1, "WARNING: Unused ICP version " << icp_version << |
645 | " received from " << from); | |
7a2f978b | 646 | } |
7a2f978b | 647 | } |
15df8349 | 648 | |
649 | void | |
650 | icpConnectionsOpen(void) | |
651 | { | |
a9245686 | 652 | u_int16_t port; |
b7ac5457 | 653 | Ip::Address addr; |
62e76326 | 654 | |
cc192b50 | 655 | struct addrinfo *xai = NULL; |
15df8349 | 656 | int x; |
15df8349 | 657 | wordlist *s; |
62e76326 | 658 | |
15df8349 | 659 | if ((port = Config.Port.icp) <= 0) |
62e76326 | 660 | return; |
661 | ||
15df8349 | 662 | enter_suid(); |
62e76326 | 663 | |
cc192b50 | 664 | addr = Config.Addrs.udp_incoming; |
665 | addr.SetPort(port); | |
31be869c | 666 | theInIcpConnection = comm_open_listener(SOCK_DGRAM, |
04f7fd38 AJ |
667 | IPPROTO_UDP, |
668 | addr, | |
669 | COMM_NONBLOCKING, | |
670 | "ICP Socket"); | |
15df8349 | 671 | leave_suid(); |
62e76326 | 672 | |
15df8349 | 673 | if (theInIcpConnection < 0) |
62e76326 | 674 | fatal("Cannot open ICP Port"); |
675 | ||
15df8349 | 676 | commSetSelect(theInIcpConnection, |
62e76326 | 677 | COMM_SELECT_READ, |
678 | icpHandleUdp, | |
679 | NULL, | |
680 | 0); | |
681 | ||
15df8349 | 682 | for (s = Config.mcast_group_list; s; s = s->next) |
62e76326 | 683 | ipcache_nbgethostbyname(s->key, mcastJoinGroups, NULL); |
684 | ||
cc192b50 | 685 | debugs(12, 1, "Accepting ICP messages at " << addr << ", FD " << theInIcpConnection << "."); |
62e76326 | 686 | |
cc192b50 | 687 | addr.SetEmpty(); // clear for next use. |
688 | addr = Config.Addrs.udp_outgoing; | |
689 | if ( !addr.IsNoAddr() ) { | |
62e76326 | 690 | enter_suid(); |
cc192b50 | 691 | addr.SetPort(port); |
31be869c | 692 | theOutIcpConnection = comm_open_listener(SOCK_DGRAM, |
04f7fd38 AJ |
693 | IPPROTO_UDP, |
694 | addr, | |
695 | COMM_NONBLOCKING, | |
696 | "ICP Port"); | |
62e76326 | 697 | leave_suid(); |
698 | ||
699 | if (theOutIcpConnection < 0) | |
700 | fatal("Cannot open Outgoing ICP Port"); | |
701 | ||
702 | commSetSelect(theOutIcpConnection, | |
703 | COMM_SELECT_READ, | |
704 | icpHandleUdp, | |
705 | NULL, | |
706 | 0); | |
707 | ||
cc192b50 | 708 | debugs(12, 1, "Outgoing ICP messages on port " << addr.GetPort() << ", FD " << theOutIcpConnection << "."); |
62e76326 | 709 | |
710 | fd_note(theOutIcpConnection, "Outgoing ICP socket"); | |
711 | ||
712 | fd_note(theInIcpConnection, "Incoming ICP socket"); | |
15df8349 | 713 | } else { |
62e76326 | 714 | theOutIcpConnection = theInIcpConnection; |
15df8349 | 715 | } |
62e76326 | 716 | |
cc192b50 | 717 | theOutICPAddr.SetEmpty(); |
62e76326 | 718 | |
cc192b50 | 719 | theOutICPAddr.InitAddrInfo(xai); |
62e76326 | 720 | |
cc192b50 | 721 | x = getsockname(theOutIcpConnection, xai->ai_addr, &xai->ai_addrlen); |
62e76326 | 722 | |
15df8349 | 723 | if (x < 0) |
bf8fe701 | 724 | debugs(50, 1, "theOutIcpConnection FD " << theOutIcpConnection << ": getsockname: " << xstrerror()); |
15df8349 | 725 | else |
cc192b50 | 726 | theOutICPAddr = *xai; |
727 | ||
728 | theOutICPAddr.FreeAddrInfo(xai); | |
15df8349 | 729 | } |
c0fbae16 | 730 | |
63be0a78 | 731 | /** |
26ac0430 | 732 | * icpConnectionShutdown only closes the 'in' socket if it is |
17e6c0a1 | 733 | * different than the 'out' socket. |
734 | */ | |
c0fbae16 | 735 | void |
17e6c0a1 | 736 | icpConnectionShutdown(void) |
c0fbae16 | 737 | { |
738 | if (theInIcpConnection < 0) | |
62e76326 | 739 | return; |
740 | ||
17e6c0a1 | 741 | if (theInIcpConnection != theOutIcpConnection) { |
bf8fe701 | 742 | debugs(12, 1, "FD " << theInIcpConnection << " Closing ICP connection"); |
62e76326 | 743 | comm_close(theInIcpConnection); |
17e6c0a1 | 744 | } |
62e76326 | 745 | |
63be0a78 | 746 | /** |
c0fbae16 | 747 | * Here we set 'theInIcpConnection' to -1 even though the ICP 'in' |
748 | * and 'out' sockets might be just one FD. This prevents this | |
749 | * function from executing repeatedly. When we are really ready to | |
750 | * exit or restart, main will comm_close the 'out' descriptor. | |
751 | */ | |
752 | theInIcpConnection = -1; | |
62e76326 | 753 | |
63be0a78 | 754 | /** |
c0fbae16 | 755 | * Normally we only write to the outgoing ICP socket, but |
756 | * we also have a read handler there to catch messages sent | |
757 | * to that specific interface. During shutdown, we must | |
758 | * disable reading on the outgoing socket. | |
759 | */ | |
760 | assert(theOutIcpConnection > -1); | |
62e76326 | 761 | |
c0fbae16 | 762 | commSetSelect(theOutIcpConnection, COMM_SELECT_READ, NULL, NULL, 0); |
763 | } | |
17e6c0a1 | 764 | |
765 | void | |
766 | icpConnectionClose(void) | |
767 | { | |
768 | icpConnectionShutdown(); | |
62e76326 | 769 | |
17e6c0a1 | 770 | if (theOutIcpConnection > -1) { |
bf8fe701 | 771 | debugs(12, 1, "FD " << theOutIcpConnection << " Closing ICP connection"); |
62e76326 | 772 | comm_close(theOutIcpConnection); |
773 | theOutIcpConnection = -1; | |
17e6c0a1 | 774 | } |
775 | } | |
071a3ae7 | 776 | |
777 | static void | |
778 | icpCount(void *buf, int which, size_t len, int delay) | |
779 | { | |
e6ccf245 | 780 | icp_common_t *icp = (icp_common_t *) buf; |
62e76326 | 781 | |
071a3ae7 | 782 | if (len < sizeof(*icp)) |
62e76326 | 783 | return; |
784 | ||
071a3ae7 | 785 | if (SENT == which) { |
62e76326 | 786 | statCounter.icp.pkts_sent++; |
787 | kb_incr(&statCounter.icp.kbytes_sent, len); | |
788 | ||
789 | if (ICP_QUERY == icp->opcode) { | |
790 | statCounter.icp.queries_sent++; | |
791 | kb_incr(&statCounter.icp.q_kbytes_sent, len); | |
792 | } else { | |
793 | statCounter.icp.replies_sent++; | |
794 | kb_incr(&statCounter.icp.r_kbytes_sent, len); | |
795 | /* this is the sent-reply service time */ | |
796 | statHistCount(&statCounter.icp.reply_svc_time, delay); | |
797 | } | |
798 | ||
799 | if (ICP_HIT == icp->opcode) | |
800 | statCounter.icp.hits_sent++; | |
071a3ae7 | 801 | } else if (RECV == which) { |
62e76326 | 802 | statCounter.icp.pkts_recv++; |
803 | kb_incr(&statCounter.icp.kbytes_recv, len); | |
804 | ||
805 | if (ICP_QUERY == icp->opcode) { | |
806 | statCounter.icp.queries_recv++; | |
807 | kb_incr(&statCounter.icp.q_kbytes_recv, len); | |
808 | } else { | |
809 | statCounter.icp.replies_recv++; | |
810 | kb_incr(&statCounter.icp.r_kbytes_recv, len); | |
811 | /* statCounter.icp.query_svc_time set in clientUpdateCounters */ | |
812 | } | |
813 | ||
814 | if (ICP_HIT == icp->opcode) | |
815 | statCounter.icp.hits_recv++; | |
071a3ae7 | 816 | } |
817 | } | |
007b8be4 | 818 | |
819 | #define N_QUERIED_KEYS 8192 | |
820 | #define N_QUERIED_KEYS_MASK 8191 | |
c3031d67 | 821 | static cache_key queried_keys[N_QUERIED_KEYS][SQUID_MD5_DIGEST_LENGTH]; |
007b8be4 | 822 | |
823 | int | |
5942e8d4 | 824 | icpSetCacheKey(const cache_key * key) |
007b8be4 | 825 | { |
826 | static int reqnum = 0; | |
62e76326 | 827 | |
007b8be4 | 828 | if (++reqnum < 0) |
62e76326 | 829 | reqnum = 1; |
830 | ||
007b8be4 | 831 | storeKeyCopy(queried_keys[reqnum & N_QUERIED_KEYS_MASK], key); |
62e76326 | 832 | |
007b8be4 | 833 | return reqnum; |
834 | } | |
835 | ||
836 | const cache_key * | |
837 | icpGetCacheKey(const char *url, int reqnum) | |
838 | { | |
839 | if (neighbors_do_private_keys && reqnum) | |
62e76326 | 840 | return queried_keys[reqnum & N_QUERIED_KEYS_MASK]; |
841 | ||
007b8be4 | 842 | return storeKeyPublic(url, METHOD_GET); |
843 | } |