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04f55905 | 1 | /* |
b510f3a1 | 2 | * DEBUG: section 05 Listener Socket Handler |
04f55905 AJ |
3 | * AUTHOR: Harvest Derived |
4 | * | |
5 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
6 | * ---------------------------------------------------------- | |
7 | * | |
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. | |
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. | |
21 | * | |
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. | |
26 | * | |
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 | * Copyright (c) 2003, Robert Collins <robertc@squid-cache.org> | |
33 | */ | |
34 | ||
582c2af2 | 35 | #include "squid.h" |
a9870624 | 36 | #include "base/TextException.h" |
95e6d864 | 37 | #include "client_db.h" |
04f55905 | 38 | #include "comm/AcceptLimiter.h" |
582c2af2 | 39 | #include "CommCalls.h" |
04f55905 | 40 | #include "comm/comm_internal.h" |
5b67dfa4 | 41 | #include "comm/Connection.h" |
d841c88d | 42 | #include "comm/Loops.h" |
cbff89ba | 43 | #include "comm/TcpAcceptor.h" |
c4ad1349 | 44 | #include "fd.h" |
04f55905 | 45 | #include "fde.h" |
67679543 | 46 | #include "globals.h" |
40d34a62 | 47 | #include "ip/Intercept.h" |
582c2af2 | 48 | #include "profiler/Profiler.h" |
4d5904f7 | 49 | #include "SquidConfig.h" |
04f55905 | 50 | #include "SquidTime.h" |
e4f1fdae | 51 | #include "StatCounters.h" |
04f55905 | 52 | |
21d845b1 FC |
53 | #if HAVE_ERRNO_H |
54 | #include <errno.h> | |
55 | #endif | |
f842580f AJ |
56 | #ifdef HAVE_NETINET_TCP_H |
57 | // required for accept_filter to build. | |
58 | #include <netinet/tcp.h> | |
59 | #endif | |
21d845b1 | 60 | |
f842580f | 61 | CBDATA_NAMESPACED_CLASS_INIT(Comm, TcpAcceptor); |
a9870624 | 62 | |
8bbb16e3 | 63 | Comm::TcpAcceptor::TcpAcceptor(const Comm::ConnectionPointer &newConn, const char *note, const Subscription::Pointer &aSub) : |
cbff89ba | 64 | AsyncJob("Comm::TcpAcceptor"), |
0ba55a12 AJ |
65 | errcode(0), |
66 | isLimited(0), | |
5b67dfa4 AJ |
67 | theCallSub(aSub), |
68 | conn(newConn) | |
cbff89ba | 69 | {} |
0ba55a12 AJ |
70 | |
71 | void | |
cbff89ba | 72 | Comm::TcpAcceptor::subscribe(const Subscription::Pointer &aSub) |
0ba55a12 | 73 | { |
cbff89ba | 74 | debugs(5, 5, HERE << status() << " AsyncCall Subscription: " << aSub); |
5b67dfa4 AJ |
75 | unsubscribe("subscription change"); |
76 | theCallSub = aSub; | |
4c5518e5 AJ |
77 | } |
78 | ||
0ba55a12 | 79 | void |
cbff89ba | 80 | Comm::TcpAcceptor::unsubscribe(const char *reason) |
0ba55a12 | 81 | { |
cbff89ba | 82 | debugs(5, 5, HERE << status() << " AsyncCall Subscription " << theCallSub << " removed: " << reason); |
5b67dfa4 | 83 | theCallSub = NULL; |
0ba55a12 AJ |
84 | } |
85 | ||
a9870624 | 86 | void |
cbff89ba | 87 | Comm::TcpAcceptor::start() |
a9870624 | 88 | { |
cbff89ba | 89 | debugs(5, 5, HERE << status() << " AsyncCall Subscription: " << theCallSub); |
a9870624 AJ |
90 | |
91 | Must(IsConnOpen(conn)); | |
92 | ||
93 | setListen(); | |
94 | ||
95 | // if no error so far start accepting connections. | |
96 | if (errcode == 0) | |
8bbb16e3 | 97 | SetSelect(conn->fd, COMM_SELECT_READ, doAccept, this, 0); |
a9870624 AJ |
98 | } |
99 | ||
100 | bool | |
cbff89ba | 101 | Comm::TcpAcceptor::doneAll() const |
a9870624 | 102 | { |
6f8536c0 | 103 | // stop when FD is closed |
a9870624 | 104 | if (!IsConnOpen(conn)) { |
a9870624 AJ |
105 | return AsyncJob::doneAll(); |
106 | } | |
107 | ||
5b67dfa4 AJ |
108 | // stop when handlers are gone |
109 | if (theCallSub == NULL) { | |
a9870624 AJ |
110 | return AsyncJob::doneAll(); |
111 | } | |
112 | ||
5b67dfa4 | 113 | // open FD with handlers...keep accepting. |
a9870624 AJ |
114 | return false; |
115 | } | |
116 | ||
117 | void | |
cbff89ba | 118 | Comm::TcpAcceptor::swanSong() |
a9870624 AJ |
119 | { |
120 | debugs(5,5, HERE); | |
5b67dfa4 | 121 | unsubscribe("swanSong"); |
a9870624 | 122 | conn = NULL; |
5b67dfa4 | 123 | AcceptLimiter::Instance().removeDead(this); |
a9870624 AJ |
124 | AsyncJob::swanSong(); |
125 | } | |
126 | ||
cbff89ba AJ |
127 | const char * |
128 | Comm::TcpAcceptor::status() const | |
129 | { | |
8bbb16e3 AJ |
130 | if (conn == NULL) |
131 | return "[nil connection]"; | |
132 | ||
cbff89ba AJ |
133 | static char ipbuf[MAX_IPSTRLEN] = {'\0'}; |
134 | if (ipbuf[0] == '\0') | |
8bbb16e3 | 135 | conn->local.ToHostname(ipbuf, MAX_IPSTRLEN); |
cbff89ba AJ |
136 | |
137 | static MemBuf buf; | |
138 | buf.reset(); | |
8bbb16e3 | 139 | buf.Printf(" FD %d, %s",conn->fd, ipbuf); |
cbff89ba AJ |
140 | |
141 | const char *jobStatus = AsyncJob::status(); | |
142 | buf.append(jobStatus, strlen(jobStatus)); | |
143 | ||
144 | return buf.content(); | |
145 | } | |
146 | ||
0ba55a12 AJ |
147 | /** |
148 | * New-style listen and accept routines | |
149 | * | |
150 | * setListen simply registers our interest in an FD for listening. | |
151 | * The constructor takes a callback to call when an FD has been | |
152 | * accept()ed some time later. | |
153 | */ | |
154 | void | |
cbff89ba | 155 | Comm::TcpAcceptor::setListen() |
0ba55a12 AJ |
156 | { |
157 | errcode = 0; // reset local errno copy. | |
a9870624 | 158 | if (listen(conn->fd, Squid_MaxFD >> 2) < 0) { |
cbff89ba | 159 | debugs(50, DBG_CRITICAL, "ERROR: listen(" << status() << ", " << (Squid_MaxFD >> 2) << "): " << xstrerror()); |
0ba55a12 AJ |
160 | errcode = errno; |
161 | return; | |
162 | } | |
163 | ||
164 | if (Config.accept_filter && strcmp(Config.accept_filter, "none") != 0) { | |
165 | #ifdef SO_ACCEPTFILTER | |
166 | struct accept_filter_arg afa; | |
167 | bzero(&afa, sizeof(afa)); | |
5b67dfa4 | 168 | debugs(5, DBG_IMPORTANT, "Installing accept filter '" << Config.accept_filter << "' on " << conn); |
0ba55a12 | 169 | xstrncpy(afa.af_name, Config.accept_filter, sizeof(afa.af_name)); |
a9870624 | 170 | if (setsockopt(conn->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) |
5b67dfa4 | 171 | debugs(5, DBG_CRITICAL, "WARNING: SO_ACCEPTFILTER '" << Config.accept_filter << "': '" << xstrerror()); |
0ba55a12 AJ |
172 | #elif defined(TCP_DEFER_ACCEPT) |
173 | int seconds = 30; | |
174 | if (strncmp(Config.accept_filter, "data=", 5) == 0) | |
175 | seconds = atoi(Config.accept_filter + 5); | |
a9870624 | 176 | if (setsockopt(conn->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &seconds, sizeof(seconds)) < 0) |
5b67dfa4 | 177 | debugs(5, DBG_CRITICAL, "WARNING: TCP_DEFER_ACCEPT '" << Config.accept_filter << "': '" << xstrerror()); |
0ba55a12 | 178 | #else |
5b67dfa4 | 179 | debugs(5, DBG_CRITICAL, "WARNING: accept_filter not supported on your OS"); |
0ba55a12 AJ |
180 | #endif |
181 | } | |
04f55905 AJ |
182 | } |
183 | ||
184 | /** | |
185 | * This private callback is called whenever a filedescriptor is ready | |
186 | * to dupe itself and fob off an accept()ed connection | |
187 | * | |
188 | * It will either do that accept operation. Or if there are not enough FD | |
189 | * available to do the clone safely will push the listening FD into a list | |
190 | * of deferred operations. The list gets kicked and the dupe/accept() actually | |
191 | * done later when enough sockets become available. | |
192 | */ | |
193 | void | |
cbff89ba | 194 | Comm::TcpAcceptor::doAccept(int fd, void *data) |
04f55905 | 195 | { |
5b67dfa4 AJ |
196 | try { |
197 | debugs(5, 2, HERE << "New connection on FD " << fd); | |
04f55905 | 198 | |
5b67dfa4 | 199 | Must(isOpen(fd)); |
cbff89ba | 200 | TcpAcceptor *afd = static_cast<TcpAcceptor*>(data); |
04f55905 | 201 | |
5b67dfa4 AJ |
202 | if (!okToAccept()) { |
203 | AcceptLimiter::Instance().defer(afd); | |
204 | } else { | |
205 | afd->acceptNext(); | |
206 | } | |
cbff89ba | 207 | SetSelect(fd, COMM_SELECT_READ, Comm::TcpAcceptor::doAccept, afd, 0); |
5b67dfa4 | 208 | |
db98b2bd | 209 | } catch (const std::exception &e) { |
cbff89ba | 210 | fatalf("FATAL: error while accepting new client connection: %s\n", e.what()); |
db98b2bd | 211 | } catch (...) { |
5b67dfa4 | 212 | fatal("FATAL: error while accepting new client connection: [unkown]\n"); |
04f55905 | 213 | } |
04f55905 AJ |
214 | } |
215 | ||
216 | bool | |
cbff89ba | 217 | Comm::TcpAcceptor::okToAccept() |
04f55905 AJ |
218 | { |
219 | static time_t last_warn = 0; | |
220 | ||
221 | if (fdNFree() >= RESERVED_FD) | |
222 | return true; | |
223 | ||
224 | if (last_warn + 15 < squid_curtime) { | |
225 | debugs(5, DBG_CRITICAL, "WARNING! Your cache is running out of filedescriptors"); | |
226 | last_warn = squid_curtime; | |
227 | } | |
228 | ||
229 | return false; | |
230 | } | |
231 | ||
971581ee | 232 | void |
cbff89ba | 233 | Comm::TcpAcceptor::acceptOne() |
04f55905 AJ |
234 | { |
235 | /* | |
236 | * We don't worry about running low on FDs here. Instead, | |
237 | * doAccept() will use AcceptLimiter if we reach the limit | |
238 | * there. | |
239 | */ | |
240 | ||
241 | /* Accept a new connection */ | |
5b67dfa4 | 242 | ConnectionPointer newConnDetails = new Connection(); |
8bbb16e3 | 243 | const comm_err_t flag = oldAccept(newConnDetails); |
04f55905 AJ |
244 | |
245 | /* Check for errors */ | |
5b67dfa4 | 246 | if (!newConnDetails->isOpen()) { |
04f55905 | 247 | |
cbff89ba | 248 | if (flag == COMM_NOMESSAGE) { |
04f55905 | 249 | /* register interest again */ |
6f8536c0 | 250 | debugs(5, 5, HERE << "try later: " << conn << " handler Subscription: " << theCallSub); |
8bbb16e3 | 251 | SetSelect(conn->fd, COMM_SELECT_READ, doAccept, this, 0); |
971581ee | 252 | return; |
04f55905 AJ |
253 | } |
254 | ||
255 | // A non-recoverable error; notify the caller */ | |
cbff89ba | 256 | debugs(5, 5, HERE << "non-recoverable error:" << status() << " handler Subscription: " << theCallSub); |
8bbb16e3 | 257 | notify(flag, newConnDetails); |
5b67dfa4 | 258 | mustStop("Listener socket closed"); |
971581ee | 259 | return; |
04f55905 AJ |
260 | } |
261 | ||
5b67dfa4 AJ |
262 | debugs(5, 5, HERE << "Listener: " << conn << |
263 | " accepted new connection " << newConnDetails << | |
6f8536c0 | 264 | " handler Subscription: " << theCallSub); |
8bbb16e3 | 265 | notify(flag, newConnDetails); |
04f55905 AJ |
266 | } |
267 | ||
268 | void | |
cbff89ba | 269 | Comm::TcpAcceptor::acceptNext() |
04f55905 | 270 | { |
a9870624 | 271 | Must(IsConnOpen(conn)); |
5b67dfa4 | 272 | debugs(5, 2, HERE << "connection on " << conn); |
971581ee | 273 | acceptOne(); |
04f55905 AJ |
274 | } |
275 | ||
276 | void | |
8bbb16e3 | 277 | Comm::TcpAcceptor::notify(const comm_err_t flag, const Comm::ConnectionPointer &newConnDetails) const |
04f55905 AJ |
278 | { |
279 | // listener socket handlers just abandon the port with COMM_ERR_CLOSING | |
280 | // it should only happen when this object is deleted... | |
1fc32b95 | 281 | if (flag == COMM_ERR_CLOSING) { |
04f55905 AJ |
282 | return; |
283 | } | |
284 | ||
5b67dfa4 AJ |
285 | if (theCallSub != NULL) { |
286 | AsyncCall::Pointer call = theCallSub->callback(); | |
287 | CommAcceptCbParams ¶ms = GetCommParams<CommAcceptCbParams>(call); | |
a9870624 | 288 | params.fd = conn->fd; |
5b67dfa4 | 289 | params.conn = newConnDetails; |
0ba55a12 AJ |
290 | params.flag = flag; |
291 | params.xerrno = errcode; | |
292 | ScheduleCallHere(call); | |
0ba55a12 | 293 | } |
04f55905 AJ |
294 | } |
295 | ||
296 | /** | |
97b8ac39 | 297 | * accept() and process |
5b67dfa4 AJ |
298 | * Wait for an incoming connection on our listener socket. |
299 | * | |
300 | * \retval COMM_OK success. details parameter filled. | |
301 | * \retval COMM_NOMESSAGE attempted accept() but nothing useful came in. | |
302 | * \retval COMM_ERROR an outright failure occured. | |
303 | * Or if this client has too many connections already. | |
273f66c4 | 304 | */ |
5b67dfa4 | 305 | comm_err_t |
8bbb16e3 | 306 | Comm::TcpAcceptor::oldAccept(Comm::ConnectionPointer &details) |
04f55905 AJ |
307 | { |
308 | PROF_start(comm_accept); | |
e4f1fdae | 309 | ++statCounter.syscalls.sock.accepts; |
04f55905 AJ |
310 | int sock; |
311 | struct addrinfo *gai = NULL; | |
5b67dfa4 | 312 | details->local.InitAddrInfo(gai); |
04f55905 | 313 | |
1fc32b95 | 314 | errcode = 0; // reset local errno copy. |
a9870624 | 315 | if ((sock = accept(conn->fd, gai->ai_addr, &gai->ai_addrlen)) < 0) { |
1fc32b95 | 316 | errcode = errno; // store last accept errno locally. |
04f55905 | 317 | |
5b67dfa4 | 318 | details->local.FreeAddrInfo(gai); |
04f55905 AJ |
319 | |
320 | PROF_stop(comm_accept); | |
321 | ||
322 | if (ignoreErrno(errno)) { | |
cbff89ba | 323 | debugs(50, 5, HERE << status() << ": " << xstrerror()); |
04f55905 AJ |
324 | return COMM_NOMESSAGE; |
325 | } else if (ENFILE == errno || EMFILE == errno) { | |
cbff89ba | 326 | debugs(50, 3, HERE << status() << ": " << xstrerror()); |
04f55905 AJ |
327 | return COMM_ERROR; |
328 | } else { | |
e0236918 | 329 | debugs(50, DBG_IMPORTANT, HERE << status() << ": " << xstrerror()); |
04f55905 AJ |
330 | return COMM_ERROR; |
331 | } | |
332 | } | |
333 | ||
a9870624 | 334 | Must(sock >= 0); |
5b67dfa4 AJ |
335 | details->fd = sock; |
336 | details->remote = *gai; | |
04f55905 | 337 | |
5511c78a | 338 | if ( Config.client_ip_max_connections >= 0) { |
5b67dfa4 AJ |
339 | if (clientdbEstablished(details->remote, 0) > Config.client_ip_max_connections) { |
340 | debugs(50, DBG_IMPORTANT, "WARNING: " << details->remote << " attempting more than " << Config.client_ip_max_connections << " connections."); | |
341 | details->local.FreeAddrInfo(gai); | |
5511c78a AJ |
342 | return COMM_ERROR; |
343 | } | |
344 | } | |
345 | ||
903198a7 | 346 | // lookup the local-end details of this new connection |
5b67dfa4 AJ |
347 | details->local.InitAddrInfo(gai); |
348 | details->local.SetEmpty(); | |
e42281f9 AJ |
349 | if (getsockname(sock, gai->ai_addr, &gai->ai_addrlen) != 0) { |
350 | debugs(50, DBG_IMPORTANT, "ERROR: getsockname() failed to locate local-IP on " << details << ": " << xstrerror()); | |
351 | details->local.FreeAddrInfo(gai); | |
352 | return COMM_ERROR; | |
353 | } | |
5b67dfa4 AJ |
354 | details->local = *gai; |
355 | details->local.FreeAddrInfo(gai); | |
04f55905 AJ |
356 | |
357 | /* fdstat update */ | |
5b67dfa4 | 358 | // XXX : these are not all HTTP requests. use a note about type and ip:port details-> |
903198a7 | 359 | // so we end up with a uniform "(HTTP|FTP-data|HTTPS|...) remote-ip:remote-port" |
04f55905 AJ |
360 | fd_open(sock, FD_SOCKET, "HTTP Request"); |
361 | ||
362 | fdd_table[sock].close_file = NULL; | |
363 | fdd_table[sock].close_line = 0; | |
364 | ||
365 | fde *F = &fd_table[sock]; | |
5b67dfa4 AJ |
366 | details->remote.NtoA(F->ipaddr,MAX_IPSTRLEN); |
367 | F->remote_port = details->remote.GetPort(); | |
368 | F->local_addr = details->local; | |
369 | F->sock_family = details->local.IsIPv6()?AF_INET6:AF_INET; | |
04f55905 | 370 | |
903198a7 AJ |
371 | // set socket flags |
372 | commSetCloseOnExec(sock); | |
04f55905 AJ |
373 | commSetNonBlocking(sock); |
374 | ||
375 | /* IFF the socket is (tproxy) transparent, pass the flag down to allow spoofing */ | |
40d34a62 AJ |
376 | F->flags.transparent = fd_table[conn->fd].flags.transparent; // XXX: can we remove this line yet? |
377 | ||
378 | // Perform NAT or TPROXY operations to retrieve the real client/dest IP addresses | |
379 | if (conn->flags&(COMM_TRANSPARENT|COMM_INTERCEPTION) && !Ip::Interceptor.Lookup(details, conn)) { | |
380 | // Failed. | |
381 | return COMM_ERROR; | |
382 | } | |
04f55905 AJ |
383 | |
384 | PROF_stop(comm_accept); | |
5b67dfa4 | 385 | return COMM_OK; |
04f55905 | 386 | } |