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Commit | Line | Data |
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983061ed | 1 | /* |
b8ae064d | 2 | * Copyright (C) 1996-2023 The Squid Software Foundation and contributors |
e25c139f | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
983061ed | 7 | */ |
983061ed | 8 | |
bbc27441 AJ |
9 | /* DEBUG: section 26 Secure Sockets Layer Proxy */ |
10 | ||
582c2af2 | 11 | #include "squid.h" |
a011edee | 12 | #include "acl/FilledChecklist.h" |
e5ddd4ce | 13 | #include "base/AsyncCallbacks.h" |
6c420975 | 14 | #include "base/CbcPointer.h" |
2b6b1bcb | 15 | #include "base/JobWait.h" |
675b8408 | 16 | #include "base/Raw.h" |
a011edee | 17 | #include "CachePeer.h" |
9fe3d316 | 18 | #include "cbdata.h" |
a011edee | 19 | #include "client_side.h" |
602d9612 | 20 | #include "client_side_request.h" |
f5e17947 | 21 | #include "clients/HttpTunneler.h" |
9f518b4a | 22 | #include "comm.h" |
cfd66529 | 23 | #include "comm/Connection.h" |
aed188fd | 24 | #include "comm/ConnOpener.h" |
7e66d5e2 | 25 | #include "comm/Read.h" |
ec41b64c | 26 | #include "comm/Write.h" |
a011edee | 27 | #include "errorpage.h" |
6821c276 | 28 | #include "fd.h" |
a011edee | 29 | #include "fde.h" |
4f3c27a1 | 30 | #include "FwdState.h" |
40f1e76d | 31 | #include "globals.h" |
55622953 | 32 | #include "HappyConnOpener.h" |
e5ee81f0 | 33 | #include "http.h" |
a98270b0 | 34 | #include "http/StatusCode.h" |
d3dddfb5 | 35 | #include "http/Stream.h" |
a011edee | 36 | #include "HttpRequest.h" |
9710965e | 37 | #include "icmp/net_db.h" |
6dc6127b | 38 | #include "ip/QosConfig.h" |
8a713747 | 39 | #include "LogTags.h" |
a011edee | 40 | #include "MemBuf.h" |
0ce8e93b | 41 | #include "neighbors.h" |
cfd66529 | 42 | #include "PeerSelectState.h" |
55622953 | 43 | #include "ResolvedPeers.h" |
65e41a45 | 44 | #include "sbuf/SBuf.h" |
a72b6e88 | 45 | #include "security/BlindPeerConnector.h" |
4d5904f7 | 46 | #include "SquidConfig.h" |
765afa31 | 47 | #include "StatCounters.h" |
a23223bf | 48 | #if USE_OPENSSL |
93ead3fd | 49 | #include "ssl/bio.h" |
5d65362c | 50 | #include "ssl/ServerBump.h" |
a23223bf | 51 | #endif |
4e540555 | 52 | #include "tools.h" |
8b082ed9 | 53 | #include "tunnel.h" |
582c2af2 FC |
54 | #if USE_DELAY_POOLS |
55 | #include "DelayId.h" | |
56 | #endif | |
57 | ||
074d6a40 AJ |
58 | #include <climits> |
59 | #include <cerrno> | |
582c2af2 | 60 | |
8ca1d33d AJ |
61 | /** |
62 | * TunnelStateData is the state engine performing the tasks for | |
63 | * setup of a TCP tunnel from an existing open client FD to a server | |
64 | * then shuffling binary data between the resulting FD pair. | |
65 | */ | |
66 | /* | |
67 | * TODO 1: implement a read/write API on ConnStateData to send/receive blocks | |
68 | * of pre-formatted data. Then we can use that as the client side of the tunnel | |
69 | * instead of re-implementing it here and occasionally getting the ConnStateData | |
70 | * read/write state wrong. | |
71 | * | |
72 | * TODO 2: then convert this into a AsyncJob, possibly a child of 'Server' | |
73 | */ | |
6043e368 | 74 | class TunnelStateData: public PeerSelectionInitiator |
62e76326 | 75 | { |
6043e368 | 76 | CBDATA_CHILD(TunnelStateData); |
a46d2c0e | 77 | |
78 | public: | |
6b2b6cfe | 79 | TunnelStateData(ClientHttpRequest *); |
337b9aa4 | 80 | ~TunnelStateData() override; |
8ca1d33d AJ |
81 | TunnelStateData(const TunnelStateData &); // do not implement |
82 | TunnelStateData &operator =(const TunnelStateData &); // do not implement | |
a46d2c0e | 83 | |
84 | class Connection; | |
c8407295 AJ |
85 | static void ReadClient(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag errcode, int xerrno, void *data); |
86 | static void ReadServer(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag errcode, int xerrno, void *data); | |
87 | static void WriteClientDone(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data); | |
88 | static void WriteServerDone(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data); | |
a46d2c0e | 89 | |
90 | bool noConnections() const; | |
25d2603f EB |
91 | /// closes both client and server connections |
92 | void closeConnections(); | |
93 | ||
983061ed | 94 | char *url; |
6c420975 | 95 | CbcPointer<ClientHttpRequest> http; |
8a70cdbb | 96 | HttpRequest::Pointer request; |
06521a10 | 97 | AccessLogEntryPointer al; |
62e76326 | 98 | |
fb046c1b | 99 | const char * getHost() const { |
aee3523a | 100 | return (server.conn != nullptr && server.conn->getPeer() ? server.conn->getPeer()->host : request->url.host()); |
fb046c1b AJ |
101 | }; |
102 | ||
e2bbd3b3 AR |
103 | /// store the given to-server connection; prohibit retries and do not look |
104 | /// for any other destinations | |
105 | void commitToServer(const Comm::ConnectionPointer &); | |
106 | ||
3ed5793b | 107 | /// Whether the client sent a CONNECT request to us. |
1c8fc082 | 108 | bool clientExpectsConnectResponse() const { |
aff439e0 | 109 | // If we are forcing a tunnel after receiving a client CONNECT, then we |
6b2b6cfe CT |
110 | // have already responded to that CONNECT before tunnel.cc started. |
111 | if (request && request->flags.forceTunnel) | |
112 | return false; | |
5d65362c CT |
113 | #if USE_OPENSSL |
114 | // We are bumping and we had already send "OK CONNECTED" | |
090f1d3c | 115 | if (http.valid() && http->getConn() && http->getConn()->serverBump() && http->getConn()->serverBump()->at(XactionStep::tlsBump2, XactionStep::tlsBump3)) |
5d65362c CT |
116 | return false; |
117 | #endif | |
aee3523a | 118 | return !(request != nullptr && |
1c8fc082 A |
119 | (request->flags.interceptTproxy || request->flags.intercepted)); |
120 | } | |
3ed5793b | 121 | |
0ce8e93b EB |
122 | /// starts connecting to the next hop, either for the first time or while |
123 | /// recovering from the previous connect failure | |
124 | void startConnecting(); | |
25b0ce45 CT |
125 | void closePendingConnection(const Comm::ConnectionPointer &conn, const char *reason); |
126 | ||
f5e17947 | 127 | /// called when negotiations with the peer have been successfully completed |
25b0ce45 | 128 | void notePeerReadyToShovel(const Comm::ConnectionPointer &); |
f5e17947 | 129 | |
a46d2c0e | 130 | class Connection |
62e76326 | 131 | { |
a46d2c0e | 132 | |
133 | public: | |
aee3523a | 134 | Connection() : len (0), buf ((char *)xmalloc(SQUID_TCP_SO_RCVBUF)), size_ptr(nullptr), delayedLoops(0), |
25d2603f | 135 | dirty(false), |
aee3523a | 136 | readPending(nullptr), readPendingFunc(nullptr) {} |
a46d2c0e | 137 | |
8a467c4b AJ |
138 | ~Connection(); |
139 | ||
25d2603f EB |
140 | /// initiates Comm::Connection ownership, including closure monitoring |
141 | template <typename Method> | |
142 | void initConnection(const Comm::ConnectionPointer &aConn, Method method, const char *name, TunnelStateData *tunnelState); | |
143 | ||
144 | /// reacts to the external closure of our connection | |
145 | void noteClosure(); | |
146 | ||
8a467c4b | 147 | int bytesWanted(int lower=0, int upper = INT_MAX) const; |
a46d2c0e | 148 | void bytesIn(int const &); |
9a0a18de | 149 | #if USE_DELAY_POOLS |
a46d2c0e | 150 | |
151 | void setDelayId(DelayId const &); | |
152 | #endif | |
153 | ||
154 | void error(int const xerrno); | |
5c926411 | 155 | int debugLevelForError(int const xerrno) const; |
25d2603f | 156 | |
8a467c4b | 157 | void dataSent (size_t amount); |
74f35ca8 AR |
158 | /// writes 'b' buffer, setting the 'writer' member to 'callback'. |
159 | void write(const char *b, int size, AsyncCall::Pointer &callback, FREE * free_func); | |
62e76326 | 160 | int len; |
8a467c4b | 161 | char *buf; |
74f35ca8 | 162 | AsyncCall::Pointer writer; ///< pending Comm::Write callback |
ac9f46af | 163 | uint64_t *size_ptr; /* pointer to size in an ConnStateData for logging */ |
62e76326 | 164 | |
fb046c1b | 165 | Comm::ConnectionPointer conn; ///< The currently connected connection. |
9fe3d316 | 166 | uint8_t delayedLoops; ///< how many times a read on this connection has been postponed. |
fb046c1b | 167 | |
25d2603f EB |
168 | bool dirty; ///< whether write() has been called (at least once) |
169 | ||
215c41fa AJ |
170 | // XXX: make these an AsyncCall when event API can handle them |
171 | TunnelStateData *readPending; | |
172 | EVH *readPendingFunc; | |
f5e17947 | 173 | |
9a0a18de | 174 | #if USE_DELAY_POOLS |
62e76326 | 175 | |
a46d2c0e | 176 | DelayId delayId; |
59715b38 | 177 | #endif |
62e76326 | 178 | |
25d2603f EB |
179 | private: |
180 | /// the registered close handler for the connection | |
181 | AsyncCall::Pointer closer; | |
a46d2c0e | 182 | }; |
183 | ||
184 | Connection client, server; | |
8a713747 | 185 | int *status_ptr; ///< pointer for logging HTTP status |
f5e17947 | 186 | |
3248e962 | 187 | SBuf preReadClientData; |
6821c276 | 188 | SBuf preReadServerData; |
0ce8e93b | 189 | time_t startTime; ///< object creation time, before any peer selection/connection attempts |
55622953 CT |
190 | ResolvedPeersPointer destinations; ///< paths for forwarding the request |
191 | bool destinationsFound; ///< At least one candidate path found | |
e2bbd3b3 AR |
192 | |
193 | /// whether the decision to tunnel to a particular destination was final | |
194 | bool committedToServer; | |
195 | ||
a98270b0 EB |
196 | int n_tries; ///< the number of forwarding attempts so far |
197 | ||
198 | /// a reason to ban reforwarding attempts (or nil) | |
199 | const char *banRetries; | |
200 | ||
5106d639 EB |
201 | // TODO: remove after fixing deferred reads in TunnelStateData::copyRead() |
202 | CodeContext::Pointer codeContext; ///< our creator context | |
55622953 | 203 | |
2b6b1bcb AR |
204 | /// waits for a transport connection to the peer to be established/opened |
205 | JobWait<HappyConnOpener> transportWait; | |
206 | ||
207 | /// waits for the established transport connection to be secured/encrypted | |
208 | JobWait<Security::PeerConnector> encryptionWait; | |
209 | ||
210 | /// waits for an HTTP CONNECT tunnel through a cache_peer to be negotiated | |
211 | /// over the (encrypted, if needed) transport connection to that cache_peer | |
212 | JobWait<Http::Tunneler> peerWait; | |
3ed5793b | 213 | |
a46d2c0e | 214 | void copyRead(Connection &from, IOCB *completion); |
215 | ||
a23223bf | 216 | /// continue to set up connection to a peer, going async for SSL peers |
25b0ce45 CT |
217 | void connectToPeer(const Comm::ConnectionPointer &); |
218 | void secureConnectionToPeer(const Comm::ConnectionPointer &); | |
a23223bf | 219 | |
6043e368 | 220 | /* PeerSelectionInitiator API */ |
337b9aa4 AR |
221 | void noteDestination(Comm::ConnectionPointer conn) override; |
222 | void noteDestinationsEnd(ErrorState *selectionError) override; | |
6043e368 | 223 | |
55622953 CT |
224 | void syncHierNote(const Comm::ConnectionPointer &server, const char *origin); |
225 | ||
226 | /// called when a connection has been successfully established or | |
227 | /// when all candidate destinations have been tried and all have failed | |
228 | void noteConnection(HappyConnOpenerAnswer &); | |
229 | ||
55622953 CT |
230 | /// Start using an established connection |
231 | void connectDone(const Comm::ConnectionPointer &conn, const char *origin, const bool reused); | |
232 | ||
233 | void notifyConnOpener(); | |
234 | ||
6043e368 AR |
235 | void saveError(ErrorState *finalError); |
236 | void sendError(ErrorState *finalError, const char *reason); | |
237 | ||
a46d2c0e | 238 | private: |
3dde9e52 CT |
239 | void usePinned(); |
240 | ||
25b0ce45 CT |
241 | /// callback handler for the Security::PeerConnector encryptor |
242 | void noteSecurityPeerConnectorAnswer(Security::EncryptorAnswer &); | |
243 | ||
244 | /// called after connection setup (including any encryption) | |
245 | void connectedToPeer(const Comm::ConnectionPointer &); | |
246 | void establishTunnelThruProxy(const Comm::ConnectionPointer &); | |
247 | ||
248 | template <typename StepStart> | |
249 | void advanceDestination(const char *stepDescription, const Comm::ConnectionPointer &conn, const StepStart &startStep); | |
fcfdf7f9 | 250 | |
25d2603f EB |
251 | /// \returns whether the request should be retried (nil) or the description why it should not |
252 | const char *checkRetry(); | |
e2bbd3b3 AR |
253 | |
254 | bool transporting() const; | |
25d2603f | 255 | |
a98270b0 | 256 | // TODO: convert to unique_ptr |
6043e368 AR |
257 | /// details of the "last tunneling attempt" failure (if it failed) |
258 | ErrorState *savedError = nullptr; | |
259 | ||
f5e17947 CT |
260 | /// resumes operations after the (possibly failed) HTTP CONNECT exchange |
261 | void tunnelEstablishmentDone(Http::TunnelerAnswer &answer); | |
262 | ||
e6a3ff69 | 263 | void finishWritingAndDelete(Connection &); |
25d2603f EB |
264 | void deleteThis(); |
265 | ||
2b6b1bcb AR |
266 | void cancelStep(const char *reason); |
267 | ||
a98270b0 | 268 | bool exhaustedTries() const; |
e7a9b7a8 | 269 | void updateAttempts(int); |
a98270b0 | 270 | |
5c2f68b7 | 271 | public: |
c8407295 | 272 | bool keepGoingAfterRead(size_t len, Comm::Flag errcode, int xerrno, Connection &from, Connection &to); |
3ed5793b | 273 | void copy(size_t len, Connection &from, Connection &to, IOCB *); |
c8407295 AJ |
274 | void readServer(char *buf, size_t len, Comm::Flag errcode, int xerrno); |
275 | void readClient(char *buf, size_t len, Comm::Flag errcode, int xerrno); | |
276 | void writeClientDone(char *buf, size_t len, Comm::Flag flag, int xerrno); | |
277 | void writeServerDone(char *buf, size_t len, Comm::Flag flag, int xerrno); | |
3ed5793b | 278 | |
3248e962 | 279 | void copyClientBytes(); |
6821c276 | 280 | void copyServerBytes(); |
25d2603f EB |
281 | |
282 | /// handles client-to-Squid connection closure; may destroy us | |
283 | void clientClosed(); | |
284 | ||
285 | /// handles Squid-to-server connection closure; may destroy us | |
286 | void serverClosed(); | |
287 | ||
288 | /// tries connecting to another destination, if available, | |
289 | /// otherwise, initiates the transaction termination | |
290 | void retryOrBail(const char *context); | |
a46d2c0e | 291 | }; |
983061ed | 292 | |
11007d4b | 293 | static ERCB tunnelErrorComplete; |
575d05c4 AJ |
294 | static CLCB tunnelServerClosed; |
295 | static CLCB tunnelClientClosed; | |
8d77a37c | 296 | static CTCB tunnelTimeout; |
215c41fa AJ |
297 | static EVH tunnelDelayedClientRead; |
298 | static EVH tunnelDelayedServerRead; | |
30a4f2a8 | 299 | |
25d2603f | 300 | /// TunnelStateData::serverClosed() wrapper |
b8d8561b | 301 | static void |
575d05c4 | 302 | tunnelServerClosed(const CommCloseCbParams ¶ms) |
30a4f2a8 | 303 | { |
25d2603f EB |
304 | const auto tunnelState = reinterpret_cast<TunnelStateData *>(params.data); |
305 | tunnelState->serverClosed(); | |
306 | } | |
26ac0430 | 307 | |
25d2603f EB |
308 | void |
309 | TunnelStateData::serverClosed() | |
310 | { | |
311 | server.noteClosure(); | |
752fa208 | 312 | |
e6a3ff69 AR |
313 | request->hier.stopPeerClock(false); |
314 | ||
315 | finishWritingAndDelete(client); | |
30a4f2a8 | 316 | } |
317 | ||
25d2603f | 318 | /// TunnelStateData::clientClosed() wrapper |
b177367b | 319 | static void |
575d05c4 | 320 | tunnelClientClosed(const CommCloseCbParams ¶ms) |
30a4f2a8 | 321 | { |
25d2603f EB |
322 | const auto tunnelState = reinterpret_cast<TunnelStateData *>(params.data); |
323 | tunnelState->clientClosed(); | |
324 | } | |
62e76326 | 325 | |
25d2603f EB |
326 | void |
327 | TunnelStateData::clientClosed() | |
328 | { | |
329 | client.noteClosure(); | |
e6a3ff69 AR |
330 | finishWritingAndDelete(server); |
331 | } | |
26ac0430 | 332 | |
e6a3ff69 AR |
333 | /// Gracefully handles non-retriable connection closure. If necessary, either |
334 | /// starts closing the given connection or waits for its pending write to | |
335 | /// finish. Otherwise, immediately destroys the tunnel object. | |
336 | /// \prec The other Connection is not open. | |
337 | void | |
338 | TunnelStateData::finishWritingAndDelete(Connection &remainingConnection) | |
339 | { | |
25d2603f EB |
340 | if (noConnections()) |
341 | return deleteThis(); | |
342 | ||
e6a3ff69 AR |
343 | // XXX: The code below should precede the noConnections() check above. When |
344 | // there is no writer, we should trigger an immediate noConnections() | |
345 | // outcome instead of waiting for an asynchronous call to our own closure | |
346 | // callback (that will call this method again). We should not move this code | |
347 | // until a noConnections() outcome guarantees a nil writer because such a | |
348 | // move will unnecessary delay deleteThis(). | |
349 | ||
350 | if (remainingConnection.writer) { | |
351 | debugs(26, 5, "waiting to finish writing to " << remainingConnection.conn); | |
352 | // the write completion callback must close its remainingConnection | |
353 | // after noticing that the other connection is gone | |
354 | return; | |
355 | } | |
356 | ||
357 | // XXX: Stop abusing connection closure callback for terminating tunneling | |
358 | // in cases like this, where our code knows that tunneling must end. The | |
359 | // closure callback should be dedicated to handling rare connection closures | |
360 | // originated _outside_ of TunnelStateData (e.g., during shutdown). In all | |
361 | // other cases, our own close()-calling code must detail the | |
362 | // closure-triggering error (if any) _and_ clear all callbacks: Our code | |
363 | // does not need to be (asynchronously) notified of the closure that it | |
364 | // itself has initiated! Until that (significant) refactoring, | |
365 | // serverClosed() and clientClosed() callbacks will continue to mishandle | |
366 | // those rare closures as regular ones, and access.log records will continue | |
367 | // to lack some tunneling error indicators/details. | |
368 | // | |
369 | // This asynchronous close() leads to another finishWritingAndDelete() call | |
370 | // but with true noConnections() that finally triggers deleteThis(). | |
371 | remainingConnection.conn->close(); | |
25d2603f EB |
372 | } |
373 | ||
374 | /// destroys the tunnel (after performing potentially-throwing cleanup) | |
375 | void | |
376 | TunnelStateData::deleteThis() | |
377 | { | |
378 | assert(noConnections()); | |
379 | // ConnStateData pipeline should contain the CONNECT we are performing | |
380 | // but it may be invalid already (bug 4392) | |
381 | if (const auto h = http.valid()) { | |
382 | if (const auto c = h->getConn()) | |
383 | if (const auto ctx = c->pipeline.front()) | |
384 | ctx->finished(); | |
71a2ced6 | 385 | } |
25d2603f | 386 | delete this; |
30a4f2a8 | 387 | } |
983061ed | 388 | |
6b2b6cfe | 389 | TunnelStateData::TunnelStateData(ClientHttpRequest *clientRequest) : |
f5e17947 | 390 | startTime(squid_curtime), |
55622953 | 391 | destinations(new ResolvedPeers()), |
5106d639 | 392 | destinationsFound(false), |
e2bbd3b3 | 393 | committedToServer(false), |
a98270b0 EB |
394 | n_tries(0), |
395 | banRetries(nullptr), | |
5106d639 | 396 | codeContext(CodeContext::Current()) |
8ca1d33d AJ |
397 | { |
398 | debugs(26, 3, "TunnelStateData constructed this=" << this); | |
215c41fa AJ |
399 | client.readPendingFunc = &tunnelDelayedClientRead; |
400 | server.readPendingFunc = &tunnelDelayedServerRead; | |
6b2b6cfe CT |
401 | |
402 | assert(clientRequest); | |
403 | url = xstrdup(clientRequest->uri); | |
404 | request = clientRequest->request; | |
55622953 | 405 | Must(request); |
6b2b6cfe CT |
406 | server.size_ptr = &clientRequest->out.size; |
407 | client.size_ptr = &clientRequest->al->http.clientRequestSz.payloadData; | |
408 | status_ptr = &clientRequest->al->http.code; | |
6b2b6cfe CT |
409 | al = clientRequest->al; |
410 | http = clientRequest; | |
411 | ||
c6aa169d AR |
412 | al->cache.code.update(LOG_TCP_TUNNEL); |
413 | ||
25d2603f | 414 | client.initConnection(clientRequest->getConn()->clientConnection, tunnelClientClosed, "tunnelClientClosed", this); |
6b2b6cfe CT |
415 | |
416 | AsyncCall::Pointer timeoutCall = commCbCall(5, 4, "tunnelTimeout", | |
417 | CommTimeoutCbPtrFun(tunnelTimeout, this)); | |
418 | commSetConnTimeout(client.conn, Config.Timeout.lifetime, timeoutCall); | |
8ca1d33d AJ |
419 | } |
420 | ||
421 | TunnelStateData::~TunnelStateData() | |
983061ed | 422 | { |
8ca1d33d AJ |
423 | debugs(26, 3, "TunnelStateData destructed this=" << this); |
424 | assert(noConnections()); | |
425 | xfree(url); | |
2b6b1bcb | 426 | cancelStep("~TunnelStateData"); |
6043e368 | 427 | delete savedError; |
983061ed | 428 | } |
429 | ||
8a467c4b AJ |
430 | TunnelStateData::Connection::~Connection() |
431 | { | |
215c41fa AJ |
432 | if (readPending) |
433 | eventDelete(readPendingFunc, readPending); | |
434 | ||
8a467c4b AJ |
435 | safe_free(buf); |
436 | } | |
437 | ||
25d2603f EB |
438 | const char * |
439 | TunnelStateData::checkRetry() | |
440 | { | |
441 | if (shutting_down) | |
442 | return "shutting down"; | |
a98270b0 EB |
443 | if (exhaustedTries()) |
444 | return "exhausted tries"; | |
25d2603f EB |
445 | if (!FwdState::EnoughTimeToReForward(startTime)) |
446 | return "forwarding timeout"; | |
a98270b0 EB |
447 | if (banRetries) |
448 | return banRetries; | |
25d2603f EB |
449 | if (noConnections()) |
450 | return "no connections"; | |
a98270b0 | 451 | |
09835feb | 452 | // TODO: Use std::optional for peer_reply_status to avoid treating zero value specially. |
a98270b0 EB |
453 | if (request->hier.peer_reply_status != Http::scNone && !Http::IsReforwardableStatus(request->hier.peer_reply_status)) |
454 | return "received HTTP status code is not reforwardable"; | |
455 | ||
456 | // TODO: check pinned connections; see FwdState::pinnedCanRetry() | |
25d2603f EB |
457 | return nullptr; |
458 | } | |
459 | ||
460 | void | |
461 | TunnelStateData::retryOrBail(const char *context) | |
462 | { | |
25d2603f EB |
463 | assert(!server.conn); |
464 | ||
465 | const auto *bailDescription = checkRetry(); | |
466 | if (!bailDescription) { | |
467 | if (!destinations->empty()) | |
468 | return startConnecting(); // try connecting to another destination | |
469 | ||
470 | if (subscribed) { | |
471 | debugs(26, 4, "wait for more destinations to try"); | |
472 | return; // expect a noteDestination*() call | |
473 | } | |
474 | ||
475 | // fall through to bail | |
476 | } | |
477 | ||
478 | /* bail */ | |
479 | ||
480 | if (request) | |
481 | request->hier.stopPeerClock(false); | |
482 | ||
483 | // TODO: Add sendSavedErrorOr(err_type type, Http::StatusCode, context). | |
484 | // Then, the remaining method code (below) should become the common part of | |
485 | // sendNewError() and sendSavedErrorOr(), used in "error detected" cases. | |
486 | if (!savedError) | |
487 | saveError(new ErrorState(ERR_CANNOT_FORWARD, Http::scInternalServerError, request.getRaw(), al)); | |
488 | const auto canSendError = Comm::IsConnOpen(client.conn) && !client.dirty && | |
489 | clientExpectsConnectResponse(); | |
490 | if (canSendError) | |
491 | return sendError(savedError, bailDescription ? bailDescription : context); | |
492 | *status_ptr = savedError->httpStatus; | |
493 | ||
e6a3ff69 | 494 | finishWritingAndDelete(client); |
25d2603f EB |
495 | } |
496 | ||
a46d2c0e | 497 | int |
8a467c4b | 498 | TunnelStateData::Connection::bytesWanted(int lowerbound, int upperbound) const |
447e176b | 499 | { |
9a0a18de | 500 | #if USE_DELAY_POOLS |
8a467c4b | 501 | return delayId.bytesWanted(lowerbound, upperbound); |
a46d2c0e | 502 | #else |
8b082ed9 | 503 | (void)lowerbound; |
8a467c4b | 504 | return upperbound; |
a46d2c0e | 505 | #endif |
506 | } | |
62e76326 | 507 | |
a46d2c0e | 508 | void |
fa34dd97 | 509 | TunnelStateData::Connection::bytesIn(int const &count) |
a46d2c0e | 510 | { |
bf95c10a | 511 | debugs(26, 3, "len=" << len << " + count=" << count); |
9a0a18de | 512 | #if USE_DELAY_POOLS |
a46d2c0e | 513 | delayId.bytesIn(count); |
514 | #endif | |
62e76326 | 515 | |
a46d2c0e | 516 | len += count; |
447e176b | 517 | } |
62e76326 | 518 | |
55622953 CT |
519 | /// update "hierarchy" annotations with a new (possibly failed) destination |
520 | /// \param origin the name of the origin server we were trying to reach | |
521 | void | |
522 | TunnelStateData::syncHierNote(const Comm::ConnectionPointer &conn, const char *origin) | |
523 | { | |
524 | request->hier.resetPeerNotes(conn, origin); | |
12f5a662 | 525 | al->hier.resetPeerNotes(conn, origin); |
55622953 CT |
526 | } |
527 | ||
e7a9b7a8 EB |
528 | /// sets n_tries to the given value (while keeping ALE in sync) |
529 | void | |
530 | TunnelStateData::updateAttempts(const int newValue) | |
531 | { | |
532 | Assure(n_tries <= newValue); // n_tries cannot decrease | |
533 | ||
534 | // Squid probably creates at most one FwdState/TunnelStateData object per | |
535 | // ALE, but, unlike an assignment would, this increment logic works even if | |
536 | // Squid uses multiple such objects for a given ALE in some esoteric cases. | |
537 | al->requestAttempts += (newValue - n_tries); | |
538 | ||
539 | n_tries = newValue; | |
540 | debugs(26, 5, n_tries); | |
541 | } | |
542 | ||
a46d2c0e | 543 | int |
fa34dd97 | 544 | TunnelStateData::Connection::debugLevelForError(int const xerrno) const |
a46d2c0e | 545 | { |
546 | #ifdef ECONNRESET | |
547 | ||
548 | if (xerrno == ECONNRESET) | |
549 | return 2; | |
550 | ||
447e176b | 551 | #endif |
552 | ||
a46d2c0e | 553 | if (ignoreErrno(xerrno)) |
554 | return 3; | |
555 | ||
556 | return 1; | |
557 | } | |
adb78bd4 | 558 | |
983061ed | 559 | /* Read from server side and queue it for writing to the client */ |
a46d2c0e | 560 | void |
c8407295 | 561 | TunnelStateData::ReadServer(const Comm::ConnectionPointer &c, char *buf, size_t len, Comm::Flag errcode, int xerrno, void *data) |
983061ed | 562 | { |
fa34dd97 | 563 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
e0d28505 | 564 | assert(cbdataReferenceValid(tunnelState)); |
bf95c10a | 565 | debugs(26, 3, c); |
c4b7a5a9 | 566 | |
11007d4b | 567 | tunnelState->readServer(buf, len, errcode, xerrno); |
a46d2c0e | 568 | } |
62e76326 | 569 | |
a46d2c0e | 570 | void |
ced8def3 | 571 | TunnelStateData::readServer(char *, size_t len, Comm::Flag errcode, int xerrno) |
a46d2c0e | 572 | { |
bf95c10a | 573 | debugs(26, 3, server.conn << ", read " << len << " bytes, err=" << errcode); |
9fe3d316 | 574 | server.delayedLoops=0; |
d01053a2 | 575 | |
a46d2c0e | 576 | /* |
c8407295 | 577 | * Bail out early on Comm::ERR_CLOSING |
26ac0430 | 578 | * - close handlers will tidy up for us |
a46d2c0e | 579 | */ |
a55f4cea | 580 | |
c8407295 | 581 | if (errcode == Comm::ERR_CLOSING) |
a46d2c0e | 582 | return; |
62e76326 | 583 | |
ee1679df | 584 | if (len > 0) { |
a46d2c0e | 585 | server.bytesIn(len); |
a0864754 AJ |
586 | statCounter.server.all.kbytes_in += len; |
587 | statCounter.server.other.kbytes_in += len; | |
d8165775 | 588 | request->hier.notePeerRead(); |
ee1679df | 589 | } |
62e76326 | 590 | |
3ed5793b AR |
591 | if (keepGoingAfterRead(len, errcode, xerrno, server, client)) |
592 | copy(len, server, client, WriteClientDone); | |
593 | } | |
594 | ||
a46d2c0e | 595 | void |
fa34dd97 | 596 | TunnelStateData::Connection::error(int const xerrno) |
a46d2c0e | 597 | { |
bf95c10a | 598 | debugs(50, debugLevelForError(xerrno), conn << ": read/write failure: " << xstrerr(xerrno)); |
62e76326 | 599 | |
a46d2c0e | 600 | if (!ignoreErrno(xerrno)) |
fb046c1b | 601 | conn->close(); |
983061ed | 602 | } |
603 | ||
604 | /* Read from client side and queue it for writing to the server */ | |
a46d2c0e | 605 | void |
c8407295 | 606 | TunnelStateData::ReadClient(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag errcode, int xerrno, void *data) |
983061ed | 607 | { |
fa34dd97 | 608 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
11007d4b | 609 | assert (cbdataReferenceValid (tunnelState)); |
62e76326 | 610 | |
11007d4b | 611 | tunnelState->readClient(buf, len, errcode, xerrno); |
a46d2c0e | 612 | } |
62e76326 | 613 | |
a46d2c0e | 614 | void |
ced8def3 | 615 | TunnelStateData::readClient(char *, size_t len, Comm::Flag errcode, int xerrno) |
a46d2c0e | 616 | { |
bf95c10a | 617 | debugs(26, 3, client.conn << ", read " << len << " bytes, err=" << errcode); |
9fe3d316 | 618 | client.delayedLoops=0; |
d01053a2 | 619 | |
a46d2c0e | 620 | /* |
c8407295 | 621 | * Bail out early on Comm::ERR_CLOSING |
26ac0430 | 622 | * - close handlers will tidy up for us |
a46d2c0e | 623 | */ |
a55f4cea | 624 | |
c8407295 | 625 | if (errcode == Comm::ERR_CLOSING) |
a46d2c0e | 626 | return; |
a55f4cea | 627 | |
a46d2c0e | 628 | if (len > 0) { |
629 | client.bytesIn(len); | |
a0864754 | 630 | statCounter.client_http.kbytes_in += len; |
a46d2c0e | 631 | } |
62e76326 | 632 | |
3ed5793b AR |
633 | if (keepGoingAfterRead(len, errcode, xerrno, client, server)) |
634 | copy(len, client, server, WriteServerDone); | |
a46d2c0e | 635 | } |
62e76326 | 636 | |
3ed5793b AR |
637 | /// Updates state after reading from client or server. |
638 | /// Returns whether the caller should use the data just read. | |
639 | bool | |
c8407295 | 640 | TunnelStateData::keepGoingAfterRead(size_t len, Comm::Flag errcode, int xerrno, Connection &from, Connection &to) |
a46d2c0e | 641 | { |
bf95c10a | 642 | debugs(26, 3, "from={" << from.conn << "}, to={" << to.conn << "}"); |
fd54d9b2 | 643 | |
a46d2c0e | 644 | /* I think this is to prevent free-while-in-a-callback behaviour |
26ac0430 | 645 | * - RBC 20030229 |
fb046c1b | 646 | * from.conn->close() / to.conn->close() done here trigger close callbacks which may free TunnelStateData |
a46d2c0e | 647 | */ |
83564ee7 | 648 | const CbcPointer<TunnelStateData> safetyLock(this); |
62e76326 | 649 | |
60dafd5e | 650 | /* Bump the source connection read timeout on any activity */ |
8d77a37c AJ |
651 | if (Comm::IsConnOpen(from.conn)) { |
652 | AsyncCall::Pointer timeoutCall = commCbCall(5, 4, "tunnelTimeout", | |
dc49061a | 653 | CommTimeoutCbPtrFun(tunnelTimeout, this)); |
8d77a37c AJ |
654 | commSetConnTimeout(from.conn, Config.Timeout.read, timeoutCall); |
655 | } | |
99c02c10 | 656 | |
2677c3b1 JPM |
657 | /* Bump the dest connection read timeout on any activity */ |
658 | /* see Bug 3659: tunnels can be weird, with very long one-way transfers */ | |
659 | if (Comm::IsConnOpen(to.conn)) { | |
660 | AsyncCall::Pointer timeoutCall = commCbCall(5, 4, "tunnelTimeout", | |
661 | CommTimeoutCbPtrFun(tunnelTimeout, this)); | |
662 | commSetConnTimeout(to.conn, Config.Timeout.read, timeoutCall); | |
663 | } | |
664 | ||
58c0b17d | 665 | if (errcode) |
a46d2c0e | 666 | from.error (xerrno); |
60dafd5e | 667 | else if (len == 0 || !Comm::IsConnOpen(to.conn)) { |
bf95c10a | 668 | debugs(26, 3, "Nothing to write or client gone. Terminate the tunnel."); |
fb046c1b | 669 | from.conn->close(); |
62e76326 | 670 | |
60dafd5e | 671 | /* Only close the remote end if we've finished queueing data to it */ |
97c81191 | 672 | if (from.len == 0 && Comm::IsConnOpen(to.conn) ) { |
fb046c1b | 673 | to.conn->close(); |
c4b7a5a9 | 674 | } |
ec41b64c | 675 | } else if (cbdataReferenceValid(this)) { |
3ed5793b AR |
676 | return true; |
677 | } | |
678 | ||
679 | return false; | |
680 | } | |
681 | ||
682 | void | |
683 | TunnelStateData::copy(size_t len, Connection &from, Connection &to, IOCB *completion) | |
684 | { | |
bf95c10a | 685 | debugs(26, 3, "Schedule Write"); |
1c8fc082 A |
686 | AsyncCall::Pointer call = commCbCall(5,5, "TunnelBlindCopyWriteHandler", |
687 | CommIoCbPtrFun(completion, this)); | |
aee3523a | 688 | to.write(from.buf, len, call, nullptr); |
983061ed | 689 | } |
690 | ||
691 | /* Writes data from the client buffer to the server side */ | |
a46d2c0e | 692 | void |
c8407295 | 693 | TunnelStateData::WriteServerDone(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
983061ed | 694 | { |
fa34dd97 | 695 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
11007d4b | 696 | assert (cbdataReferenceValid (tunnelState)); |
aee3523a | 697 | tunnelState->server.writer = nullptr; |
a46d2c0e | 698 | |
11007d4b | 699 | tunnelState->writeServerDone(buf, len, flag, xerrno); |
a46d2c0e | 700 | } |
a55f4cea | 701 | |
a46d2c0e | 702 | void |
ced8def3 | 703 | TunnelStateData::writeServerDone(char *, size_t len, Comm::Flag flag, int xerrno) |
a46d2c0e | 704 | { |
bf95c10a | 705 | debugs(26, 3, server.conn << ", " << len << " bytes written, flag=" << flag); |
62e76326 | 706 | |
d8165775 AR |
707 | if (flag == Comm::ERR_CLOSING) |
708 | return; | |
709 | ||
710 | request->hier.notePeerWrite(); | |
711 | ||
5dacdf3f | 712 | /* Error? */ |
c8407295 | 713 | if (flag != Comm::OK) { |
d8165775 AR |
714 | debugs(26, 4, "to-server write failed: " << xerrno); |
715 | server.error(xerrno); // may call comm_close | |
5dacdf3f | 716 | return; |
c4b7a5a9 | 717 | } |
62e76326 | 718 | |
5dacdf3f | 719 | /* EOF? */ |
a46d2c0e | 720 | if (len == 0) { |
bf95c10a | 721 | debugs(26, 4, "No read input. Closing server connection."); |
fb046c1b | 722 | server.conn->close(); |
a46d2c0e | 723 | return; |
724 | } | |
62e76326 | 725 | |
5dacdf3f | 726 | /* Valid data */ |
a0864754 AJ |
727 | statCounter.server.all.kbytes_out += len; |
728 | statCounter.server.other.kbytes_out += len; | |
5dacdf3f | 729 | client.dataSent(len); |
730 | ||
a46d2c0e | 731 | /* If the other end has closed, so should we */ |
97c81191 | 732 | if (!Comm::IsConnOpen(client.conn)) { |
bf95c10a | 733 | debugs(26, 4, "Client gone away. Shutting down server connection."); |
fb046c1b | 734 | server.conn->close(); |
a55f4cea | 735 | return; |
c4b7a5a9 | 736 | } |
62e76326 | 737 | |
f53969cc | 738 | const CbcPointer<TunnelStateData> safetyLock(this); /* ??? should be locked by the caller... */ |
a46d2c0e | 739 | |
5dacdf3f | 740 | if (cbdataReferenceValid(this)) |
3248e962 | 741 | copyClientBytes(); |
983061ed | 742 | } |
743 | ||
744 | /* Writes data from the server buffer to the client side */ | |
a46d2c0e | 745 | void |
c8407295 | 746 | TunnelStateData::WriteClientDone(const Comm::ConnectionPointer &, char *buf, size_t len, Comm::Flag flag, int xerrno, void *data) |
983061ed | 747 | { |
fa34dd97 | 748 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
11007d4b | 749 | assert (cbdataReferenceValid (tunnelState)); |
aee3523a | 750 | tunnelState->client.writer = nullptr; |
a46d2c0e | 751 | |
11007d4b | 752 | tunnelState->writeClientDone(buf, len, flag, xerrno); |
a46d2c0e | 753 | } |
754 | ||
755 | void | |
e0d28505 | 756 | TunnelStateData::Connection::dataSent(size_t amount) |
a46d2c0e | 757 | { |
bf95c10a | 758 | debugs(26, 3, "len=" << len << " - amount=" << amount); |
a46d2c0e | 759 | assert(amount == (size_t)len); |
760 | len =0; | |
761 | /* increment total object size */ | |
762 | ||
763 | if (size_ptr) | |
764 | *size_ptr += amount; | |
d8165775 | 765 | |
a46d2c0e | 766 | } |
767 | ||
74f35ca8 AR |
768 | void |
769 | TunnelStateData::Connection::write(const char *b, int size, AsyncCall::Pointer &callback, FREE * free_func) | |
770 | { | |
771 | writer = callback; | |
25d2603f | 772 | dirty = true; |
74f35ca8 AR |
773 | Comm::Write(conn, b, size, callback, free_func); |
774 | } | |
775 | ||
25d2603f EB |
776 | template <typename Method> |
777 | void | |
778 | TunnelStateData::Connection::initConnection(const Comm::ConnectionPointer &aConn, Method method, const char *name, TunnelStateData *tunnelState) | |
779 | { | |
780 | Must(!Comm::IsConnOpen(conn)); | |
781 | Must(!closer); | |
782 | Must(Comm::IsConnOpen(aConn)); | |
783 | conn = aConn; | |
784 | closer = commCbCall(5, 4, name, CommCloseCbPtrFun(method, tunnelState)); | |
785 | comm_add_close_handler(conn->fd, closer); | |
786 | } | |
787 | ||
788 | void | |
789 | TunnelStateData::Connection::noteClosure() | |
790 | { | |
791 | debugs(26, 3, conn); | |
792 | conn = nullptr; | |
793 | closer = nullptr; | |
794 | writer = nullptr; // may already be nil | |
795 | } | |
796 | ||
a46d2c0e | 797 | void |
ced8def3 | 798 | TunnelStateData::writeClientDone(char *, size_t len, Comm::Flag flag, int xerrno) |
a46d2c0e | 799 | { |
bf95c10a | 800 | debugs(26, 3, client.conn << ", " << len << " bytes written, flag=" << flag); |
62e76326 | 801 | |
d8165775 AR |
802 | if (flag == Comm::ERR_CLOSING) |
803 | return; | |
804 | ||
5dacdf3f | 805 | /* Error? */ |
c8407295 | 806 | if (flag != Comm::OK) { |
d8165775 AR |
807 | debugs(26, 4, "from-client read failed: " << xerrno); |
808 | client.error(xerrno); // may call comm_close | |
5dacdf3f | 809 | return; |
c4b7a5a9 | 810 | } |
62e76326 | 811 | |
5dacdf3f | 812 | /* EOF? */ |
a46d2c0e | 813 | if (len == 0) { |
bf95c10a | 814 | debugs(26, 4, "Closing client connection due to 0 byte read."); |
fb046c1b | 815 | client.conn->close(); |
62e76326 | 816 | return; |
983061ed | 817 | } |
62e76326 | 818 | |
5dacdf3f | 819 | /* Valid data */ |
a0864754 | 820 | statCounter.client_http.kbytes_out += len; |
5dacdf3f | 821 | server.dataSent(len); |
822 | ||
a46d2c0e | 823 | /* If the other end has closed, so should we */ |
97c81191 | 824 | if (!Comm::IsConnOpen(server.conn)) { |
bf95c10a | 825 | debugs(26, 4, "Server has gone away. Terminating client connection."); |
fb046c1b | 826 | client.conn->close(); |
a55f4cea | 827 | return; |
983061ed | 828 | } |
62e76326 | 829 | |
f53969cc | 830 | CbcPointer<TunnelStateData> safetyLock(this); /* ??? should be locked by the caller... */ |
a55f4cea | 831 | |
5dacdf3f | 832 | if (cbdataReferenceValid(this)) |
6821c276 | 833 | copyServerBytes(); |
983061ed | 834 | } |
835 | ||
b8d8561b | 836 | static void |
8d77a37c | 837 | tunnelTimeout(const CommTimeoutCbParams &io) |
983061ed | 838 | { |
8d77a37c | 839 | TunnelStateData *tunnelState = static_cast<TunnelStateData *>(io.data); |
bf95c10a | 840 | debugs(26, 3, io.conn); |
11007d4b | 841 | /* Temporary lock to protect our own feets (comm_close -> tunnelClientClosed -> Free) */ |
83564ee7 | 842 | CbcPointer<TunnelStateData> safetyLock(tunnelState); |
a55f4cea | 843 | |
25d2603f | 844 | tunnelState->closeConnections(); |
a46d2c0e | 845 | } |
62e76326 | 846 | |
25b0ce45 CT |
847 | void |
848 | TunnelStateData::closePendingConnection(const Comm::ConnectionPointer &conn, const char *reason) | |
849 | { | |
850 | debugs(26, 3, "because " << reason << "; " << conn); | |
851 | assert(!server.conn); | |
852 | if (IsConnOpen(conn)) | |
853 | conn->close(); | |
854 | } | |
855 | ||
a46d2c0e | 856 | void |
25d2603f | 857 | TunnelStateData::closeConnections() |
a46d2c0e | 858 | { |
25d2603f EB |
859 | if (Comm::IsConnOpen(server.conn)) |
860 | server.conn->close(); | |
861 | if (Comm::IsConnOpen(client.conn)) | |
862 | client.conn->close(); | |
a46d2c0e | 863 | } |
864 | ||
9fe3d316 AJ |
865 | static void |
866 | tunnelDelayedClientRead(void *data) | |
867 | { | |
868 | if (!data) | |
869 | return; | |
4846303f | 870 | |
215c41fa | 871 | TunnelStateData *tunnel = static_cast<TunnelStateData*>(data); |
5106d639 EB |
872 | const auto savedContext = CodeContext::Current(); |
873 | CodeContext::Reset(tunnel->codeContext); | |
aee3523a | 874 | tunnel->client.readPending = nullptr; |
9fe3d316 | 875 | static uint64_t counter=0; |
215c41fa | 876 | debugs(26, 7, "Client read(2) delayed " << ++counter << " times"); |
9fe3d316 | 877 | tunnel->copyRead(tunnel->client, TunnelStateData::ReadClient); |
5106d639 | 878 | CodeContext::Reset(savedContext); |
9fe3d316 AJ |
879 | } |
880 | ||
881 | static void | |
882 | tunnelDelayedServerRead(void *data) | |
883 | { | |
884 | if (!data) | |
885 | return; | |
4846303f | 886 | |
215c41fa | 887 | TunnelStateData *tunnel = static_cast<TunnelStateData*>(data); |
5106d639 EB |
888 | const auto savedContext = CodeContext::Current(); |
889 | CodeContext::Reset(tunnel->codeContext); | |
aee3523a | 890 | tunnel->server.readPending = nullptr; |
9fe3d316 | 891 | static uint64_t counter=0; |
215c41fa | 892 | debugs(26, 7, "Server read(2) delayed " << ++counter << " times"); |
9fe3d316 | 893 | tunnel->copyRead(tunnel->server, TunnelStateData::ReadServer); |
5106d639 | 894 | CodeContext::Reset(savedContext); |
9fe3d316 AJ |
895 | } |
896 | ||
a46d2c0e | 897 | void |
fa34dd97 | 898 | TunnelStateData::copyRead(Connection &from, IOCB *completion) |
a46d2c0e | 899 | { |
900 | assert(from.len == 0); | |
9fe3d316 AJ |
901 | // If only the minimum permitted read size is going to be attempted |
902 | // then we schedule an event to try again in a few I/O cycles. | |
903 | // Allow at least 1 byte to be read every (0.3*10) seconds. | |
904 | int bw = from.bytesWanted(1, SQUID_TCP_SO_RCVBUF); | |
5106d639 EB |
905 | // XXX: Delay pools must not delay client-to-Squid traffic (i.e. when |
906 | // from.readPendingFunc is tunnelDelayedClientRead()). | |
a928fdfd | 907 | // XXX: Bug #4913: For delay pools, use delayRead() API instead. |
9fe3d316 | 908 | if (bw == 1 && ++from.delayedLoops < 10) { |
215c41fa AJ |
909 | from.readPending = this; |
910 | eventAdd("tunnelDelayedServerRead", from.readPendingFunc, from.readPending, 0.3, true); | |
9fe3d316 AJ |
911 | return; |
912 | } | |
913 | ||
fd54d9b2 | 914 | AsyncCall::Pointer call = commCbCall(5,4, "TunnelBlindCopyReadHandler", |
abd8f140 | 915 | CommIoCbPtrFun(completion, this)); |
9fe3d316 | 916 | comm_read(from.conn, from.buf, bw, call); |
983061ed | 917 | } |
918 | ||
3248e962 CT |
919 | void |
920 | TunnelStateData::copyClientBytes() | |
921 | { | |
922 | if (preReadClientData.length()) { | |
923 | size_t copyBytes = preReadClientData.length() > SQUID_TCP_SO_RCVBUF ? SQUID_TCP_SO_RCVBUF : preReadClientData.length(); | |
924 | memcpy(client.buf, preReadClientData.rawContent(), copyBytes); | |
925 | preReadClientData.consume(copyBytes); | |
926 | client.bytesIn(copyBytes); | |
927 | if (keepGoingAfterRead(copyBytes, Comm::OK, 0, client, server)) | |
928 | copy(copyBytes, client, server, TunnelStateData::WriteServerDone); | |
929 | } else | |
930 | copyRead(client, ReadClient); | |
931 | } | |
932 | ||
6821c276 CT |
933 | void |
934 | TunnelStateData::copyServerBytes() | |
935 | { | |
936 | if (preReadServerData.length()) { | |
937 | size_t copyBytes = preReadServerData.length() > SQUID_TCP_SO_RCVBUF ? SQUID_TCP_SO_RCVBUF : preReadServerData.length(); | |
938 | memcpy(server.buf, preReadServerData.rawContent(), copyBytes); | |
939 | preReadServerData.consume(copyBytes); | |
940 | server.bytesIn(copyBytes); | |
941 | if (keepGoingAfterRead(copyBytes, Comm::OK, 0, server, client)) | |
942 | copy(copyBytes, server, client, TunnelStateData::WriteClientDone); | |
943 | } else | |
944 | copyRead(server, ReadServer); | |
945 | } | |
946 | ||
379e8c1c | 947 | /** |
87f237a9 | 948 | * Set the HTTP status for this request and sets the read handlers for client |
379e8c1c AR |
949 | * and server side connections. |
950 | */ | |
951 | static void | |
952 | tunnelStartShoveling(TunnelStateData *tunnelState) | |
953 | { | |
2b6b1bcb AR |
954 | assert(!tunnelState->transportWait); |
955 | assert(!tunnelState->encryptionWait); | |
956 | assert(!tunnelState->peerWait); | |
957 | ||
25b0ce45 CT |
958 | assert(tunnelState->server.conn); |
959 | AsyncCall::Pointer timeoutCall = commCbCall(5, 4, "tunnelTimeout", | |
960 | CommTimeoutCbPtrFun(tunnelTimeout, tunnelState)); | |
961 | commSetConnTimeout(tunnelState->server.conn, Config.Timeout.read, timeoutCall); | |
962 | ||
955394ce | 963 | *tunnelState->status_ptr = Http::scOkay; |
379e8c1c | 964 | if (cbdataReferenceValid(tunnelState)) { |
6c420975 | 965 | |
5eedd56a | 966 | // Shovel any payload already pushed into reply buffer by the server response |
3ed5793b | 967 | if (!tunnelState->server.len) |
6821c276 | 968 | tunnelState->copyServerBytes(); |
6c420975 AJ |
969 | else { |
970 | debugs(26, DBG_DATA, "Tunnel server PUSH Payload: \n" << Raw("", tunnelState->server.buf, tunnelState->server.len) << "\n----------"); | |
3ed5793b | 971 | tunnelState->copy(tunnelState->server.len, tunnelState->server, tunnelState->client, TunnelStateData::WriteClientDone); |
6c420975 AJ |
972 | } |
973 | ||
fcc444e3 AJ |
974 | if (tunnelState->http.valid() && tunnelState->http->getConn() && !tunnelState->http->getConn()->inBuf.isEmpty()) { |
975 | SBuf * const in = &tunnelState->http->getConn()->inBuf; | |
976 | debugs(26, DBG_DATA, "Tunnel client PUSH Payload: \n" << *in << "\n----------"); | |
977 | tunnelState->preReadClientData.append(*in); | |
978 | in->consume(); // ConnStateData buffer accounting after the shuffle. | |
3248e962 CT |
979 | } |
980 | tunnelState->copyClientBytes(); | |
379e8c1c AR |
981 | } |
982 | } | |
983 | ||
b0388924 AJ |
984 | /** |
985 | * All the pieces we need to write to client and/or server connection | |
1b76e6c1 | 986 | * have been written. |
379e8c1c | 987 | * Call the tunnelStartShoveling to start the blind pump. |
b0388924 | 988 | */ |
c4b7a5a9 | 989 | static void |
c6f9a0ff | 990 | tunnelConnectedWriteDone(const Comm::ConnectionPointer &conn, char *, size_t len, Comm::Flag flag, int, void *data) |
c4b7a5a9 | 991 | { |
fa34dd97 | 992 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
bf95c10a | 993 | debugs(26, 3, conn << ", flag=" << flag); |
aee3523a | 994 | tunnelState->client.writer = nullptr; |
62e76326 | 995 | |
c8407295 | 996 | if (flag != Comm::OK) { |
955394ce | 997 | *tunnelState->status_ptr = Http::scInternalServerError; |
e0d28505 | 998 | tunnelErrorComplete(conn->fd, data, 0); |
62e76326 | 999 | return; |
1000 | } | |
1001 | ||
c6f9a0ff CT |
1002 | if (auto http = tunnelState->http.get()) { |
1003 | http->out.headers_sz += len; | |
1004 | http->out.size += len; | |
1005 | } | |
1006 | ||
379e8c1c | 1007 | tunnelStartShoveling(tunnelState); |
c4b7a5a9 | 1008 | } |
1009 | ||
f5e17947 CT |
1010 | void |
1011 | TunnelStateData::tunnelEstablishmentDone(Http::TunnelerAnswer &answer) | |
3ed5793b | 1012 | { |
2b6b1bcb | 1013 | peerWait.finish(); |
f5e17947 | 1014 | server.len = 0; |
3ed5793b | 1015 | |
a98270b0 EB |
1016 | // XXX: al->http.code (i.e. *status_ptr) should not be (re)set |
1017 | // until we actually start responding to the client. Right here/now, we only | |
1018 | // know how this cache_peer has responded to us. | |
f5e17947 CT |
1019 | if (answer.peerResponseStatus != Http::scNone) |
1020 | *status_ptr = answer.peerResponseStatus; | |
1021 | ||
25b0ce45 CT |
1022 | auto sawProblem = false; |
1023 | ||
1024 | if (!answer.positive()) { | |
1025 | sawProblem = true; | |
2b6b1bcb | 1026 | assert(!answer.conn); |
25b0ce45 CT |
1027 | } else if (!Comm::IsConnOpen(answer.conn) || fd_table[answer.conn->fd].closing()) { |
1028 | sawProblem = true; | |
1029 | closePendingConnection(answer.conn, "conn was closed while waiting for tunnelEstablishmentDone"); | |
1030 | } | |
1031 | ||
1032 | if (!sawProblem) { | |
1033 | assert(answer.positive()); // paranoid | |
f5e17947 CT |
1034 | // copy any post-200 OK bytes to our buffer |
1035 | preReadServerData = answer.leftovers; | |
25b0ce45 | 1036 | notePeerReadyToShovel(answer.conn); |
3ed5793b AR |
1037 | return; |
1038 | } | |
1039 | ||
25b0ce45 CT |
1040 | ErrorState *error = nullptr; |
1041 | if (answer.positive()) { | |
1042 | error = new ErrorState(ERR_CANNOT_FORWARD, Http::scServiceUnavailable, request.getRaw(), al); | |
1043 | } else { | |
1044 | error = answer.squidError.get(); | |
1045 | Must(error); | |
1046 | answer.squidError.clear(); // preserve error for errorSendComplete() | |
1047 | } | |
1048 | assert(error); | |
1049 | saveError(error); | |
25d2603f | 1050 | retryOrBail("tunneler error"); |
3ed5793b AR |
1051 | } |
1052 | ||
f5e17947 | 1053 | void |
25b0ce45 | 1054 | TunnelStateData::notePeerReadyToShovel(const Comm::ConnectionPointer &conn) |
983061ed | 1055 | { |
25d2603f | 1056 | assert(!client.dirty); |
e2bbd3b3 | 1057 | commitToServer(conn); |
25b0ce45 | 1058 | |
f5e17947 CT |
1059 | if (!clientExpectsConnectResponse()) |
1060 | tunnelStartShoveling(this); // ssl-bumped connection, be quiet | |
379e8c1c | 1061 | else { |
f5e17947 | 1062 | *status_ptr = Http::scOkay; |
379e8c1c | 1063 | AsyncCall::Pointer call = commCbCall(5,5, "tunnelConnectedWriteDone", |
f5e17947 | 1064 | CommIoCbPtrFun(tunnelConnectedWriteDone, this)); |
ea55799d EB |
1065 | al->reply = HttpReply::MakeConnectionEstablished(); |
1066 | const auto mb = al->reply->pack(); | |
1067 | client.write(mb->content(), mb->contentSize(), call, mb->freeFunc()); | |
1068 | delete mb; | |
379e8c1c | 1069 | } |
983061ed | 1070 | } |
1071 | ||
e2bbd3b3 AR |
1072 | void |
1073 | TunnelStateData::commitToServer(const Comm::ConnectionPointer &conn) | |
1074 | { | |
1075 | committedToServer = true; | |
a98270b0 | 1076 | banRetries = "committed to server"; |
e2bbd3b3 AR |
1077 | PeerSelectionInitiator::subscribed = false; // may already be false |
1078 | server.initConnection(conn, tunnelServerClosed, "tunnelServerClosed", this); | |
1079 | } | |
1080 | ||
b8d8561b | 1081 | static void |
fd54d9b2 | 1082 | tunnelErrorComplete(int fd/*const Comm::ConnectionPointer &*/, void *data, size_t) |
30a4f2a8 | 1083 | { |
fa34dd97 | 1084 | TunnelStateData *tunnelState = (TunnelStateData *)data; |
bf95c10a | 1085 | debugs(26, 3, "FD " << fd); |
aee3523a | 1086 | assert(tunnelState != nullptr); |
11007d4b | 1087 | /* temporary lock to save our own feets (comm_close -> tunnelClientClosed -> Free) */ |
83564ee7 | 1088 | CbcPointer<TunnelStateData> safetyLock(tunnelState); |
62e76326 | 1089 | |
97c81191 | 1090 | if (Comm::IsConnOpen(tunnelState->client.conn)) |
fb046c1b | 1091 | tunnelState->client.conn->close(); |
62e76326 | 1092 | |
97c81191 | 1093 | if (Comm::IsConnOpen(tunnelState->server.conn)) |
fb046c1b | 1094 | tunnelState->server.conn->close(); |
30a4f2a8 | 1095 | } |
1096 | ||
6043e368 | 1097 | void |
55622953 | 1098 | TunnelStateData::noteConnection(HappyConnOpener::Answer &answer) |
6043e368 | 1099 | { |
2b6b1bcb | 1100 | transportWait.finish(); |
55622953 | 1101 | |
e7a9b7a8 | 1102 | updateAttempts(answer.n_tries); |
a98270b0 | 1103 | |
25b0ce45 CT |
1104 | ErrorState *error = nullptr; |
1105 | if ((error = answer.error.get())) { | |
a98270b0 | 1106 | banRetries = "HappyConnOpener gave up"; |
25b0ce45 | 1107 | Must(!Comm::IsConnOpen(answer.conn)); |
55622953 | 1108 | syncHierNote(answer.conn, request->url.host()); |
25b0ce45 CT |
1109 | answer.error.clear(); |
1110 | } else if (!Comm::IsConnOpen(answer.conn) || fd_table[answer.conn->fd].closing()) { | |
1111 | error = new ErrorState(ERR_CANNOT_FORWARD, Http::scServiceUnavailable, request.getRaw(), al); | |
1112 | closePendingConnection(answer.conn, "conn was closed while waiting for noteConnection"); | |
1113 | } | |
1114 | ||
1115 | if (error) { | |
55622953 | 1116 | saveError(error); |
25d2603f | 1117 | retryOrBail("tried all destinations"); |
55622953 CT |
1118 | return; |
1119 | } | |
6043e368 | 1120 | |
55622953 | 1121 | connectDone(answer.conn, request->url.host(), answer.reused); |
6043e368 AR |
1122 | } |
1123 | ||
55622953 CT |
1124 | void |
1125 | TunnelStateData::connectDone(const Comm::ConnectionPointer &conn, const char *origin, const bool reused) | |
983061ed | 1126 | { |
55622953 | 1127 | Must(Comm::IsConnOpen(conn)); |
cfd66529 | 1128 | |
55622953 CT |
1129 | if (reused) |
1130 | ResetMarkingsToServer(request.getRaw(), *conn); | |
1131 | // else Comm::ConnOpener already applied proper/current markings | |
1132 | ||
a98270b0 EB |
1133 | // TODO: add pconn race state tracking |
1134 | ||
25b0ce45 | 1135 | syncHierNote(conn, origin); |
cfd66529 | 1136 | |
4beb4bab AJ |
1137 | #if USE_DELAY_POOLS |
1138 | /* no point using the delayIsNoDelay stuff since tunnel is nice and simple */ | |
1139 | if (conn->getPeer() && conn->getPeer()->options.no_delay) | |
55622953 | 1140 | server.setDelayId(DelayId()); |
4beb4bab AJ |
1141 | #endif |
1142 | ||
55622953 | 1143 | netdbPingSite(request->url.host()); |
4beb4bab | 1144 | |
55622953 | 1145 | request->peer_host = conn->getPeer() ? conn->getPeer()->host : nullptr; |
cfd66529 | 1146 | |
f5e17947 CT |
1147 | bool toOrigin = false; // same semantics as StateFlags::toOrigin |
1148 | if (const auto * const peer = conn->getPeer()) { | |
55622953 | 1149 | request->prepForPeering(*peer); |
f5e17947 | 1150 | toOrigin = peer->options.originserver; |
fe40a877 | 1151 | } else { |
55622953 | 1152 | request->prepForDirect(); |
f5e17947 | 1153 | toOrigin = true; |
cfd66529 | 1154 | } |
62e76326 | 1155 | |
f5e17947 | 1156 | if (!toOrigin) |
25b0ce45 | 1157 | connectToPeer(conn); |
cfd66529 | 1158 | else { |
25b0ce45 | 1159 | notePeerReadyToShovel(conn); |
983061ed | 1160 | } |
983061ed | 1161 | } |
30a4f2a8 | 1162 | |
a98270b0 EB |
1163 | /// whether we have used up all permitted forwarding attempts |
1164 | bool | |
1165 | TunnelStateData::exhaustedTries() const | |
1166 | { | |
1167 | return n_tries >= Config.forward_max_tries; | |
1168 | } | |
1169 | ||
770f051d | 1170 | void |
ac9f46af | 1171 | tunnelStart(ClientHttpRequest * http) |
30a4f2a8 | 1172 | { |
bf95c10a | 1173 | debugs(26, 3, MYNAME); |
30a4f2a8 | 1174 | /* Create state structure. */ |
aee3523a AR |
1175 | TunnelStateData *tunnelState = nullptr; |
1176 | ErrorState *err = nullptr; | |
190154cf | 1177 | HttpRequest *request = http->request; |
d5964d58 | 1178 | char *url = http->uri; |
fb046c1b | 1179 | |
f1003989 | 1180 | /* |
4dd643d5 | 1181 | * client_addr.isNoAddr() indicates this is an "internal" request |
a4b8110e | 1182 | * from peer_digest.c, asn.c, netdb.c, etc and should always |
1183 | * be allowed. yuck, I know. | |
1184 | */ | |
62e76326 | 1185 | |
4dd643d5 | 1186 | if (Config.accessList.miss && !request->client_addr.isNoAddr()) { |
62e76326 | 1187 | /* |
1188 | * Check if this host is allowed to fetch MISSES from us (miss_access) | |
b50e327b | 1189 | * default is to allow. |
62e76326 | 1190 | */ |
aee3523a | 1191 | ACLFilledChecklist ch(Config.accessList.miss, request, nullptr); |
cb365059 | 1192 | ch.al = http->al; |
62e76326 | 1193 | ch.src_addr = request->client_addr; |
1194 | ch.my_addr = request->my_addr; | |
cb365059 | 1195 | ch.syncAle(request, http->log_uri); |
06bf5384 | 1196 | if (ch.fastCheck().denied()) { |
bf95c10a | 1197 | debugs(26, 4, "MISS access forbidden."); |
c6aa169d | 1198 | http->updateLoggingTags(LOG_TCP_TUNNEL); |
7e6eabbc | 1199 | err = new ErrorState(ERR_FORWARDING_DENIED, Http::scForbidden, request, http->al); |
ac9f46af | 1200 | http->al->http.code = Http::scForbidden; |
73c36fd9 | 1201 | errorSend(http->getConn()->clientConnection, err); |
62e76326 | 1202 | return; |
1203 | } | |
f1003989 | 1204 | } |
62e76326 | 1205 | |
7f06a3d8 | 1206 | debugs(26, 3, request->method << ' ' << url << ' ' << request->http_ver); |
5db6bf73 FC |
1207 | ++statCounter.server.all.requests; |
1208 | ++statCounter.server.other.requests; | |
62e76326 | 1209 | |
6b2b6cfe | 1210 | tunnelState = new TunnelStateData(http); |
9a0a18de | 1211 | #if USE_DELAY_POOLS |
f5e17947 | 1212 | tunnelState->server.setDelayId(DelayId::DelayClient(http)); |
59715b38 | 1213 | #endif |
6043e368 | 1214 | tunnelState->startSelectingDestinations(request, http->al, nullptr); |
30a4f2a8 | 1215 | } |
98ffb7e4 | 1216 | |
a23223bf | 1217 | void |
25b0ce45 | 1218 | TunnelStateData::connectToPeer(const Comm::ConnectionPointer &conn) |
e2849af8 | 1219 | { |
25b0ce45 CT |
1220 | if (const auto p = conn->getPeer()) { |
1221 | if (p->secure.encryptTransport) | |
1222 | return advanceDestination("secure connection to peer", conn, [this,&conn] { | |
1c2b4465 CT |
1223 | secureConnectionToPeer(conn); |
1224 | }); | |
a23223bf | 1225 | } |
a23223bf | 1226 | |
25b0ce45 | 1227 | connectedToPeer(conn); |
a23223bf CT |
1228 | } |
1229 | ||
25b0ce45 | 1230 | /// encrypts an established TCP connection to peer |
a23223bf | 1231 | void |
25b0ce45 CT |
1232 | TunnelStateData::secureConnectionToPeer(const Comm::ConnectionPointer &conn) |
1233 | { | |
e5ddd4ce | 1234 | const auto callback = asyncCallback(5, 4, TunnelStateData::noteSecurityPeerConnectorAnswer, this); |
25b0ce45 | 1235 | const auto connector = new Security::BlindPeerConnector(request, conn, callback, al); |
2b6b1bcb | 1236 | encryptionWait.start(connector, callback); |
25b0ce45 CT |
1237 | } |
1238 | ||
1239 | /// starts a preparation step for an established connection; retries on failures | |
1240 | template <typename StepStart> | |
1241 | void | |
1242 | TunnelStateData::advanceDestination(const char *stepDescription, const Comm::ConnectionPointer &conn, const StepStart &startStep) | |
1243 | { | |
1244 | // TODO: Extract destination-specific handling from TunnelStateData so that | |
1245 | // all the awkward, limited-scope advanceDestination() calls can be replaced | |
1246 | // with a single simple try/catch,retry block. | |
1247 | try { | |
1248 | startStep(); | |
1249 | // now wait for the step callback | |
1250 | } catch (...) { | |
1251 | debugs (26, 2, "exception while trying to " << stepDescription << ": " << CurrentException); | |
1252 | closePendingConnection(conn, "connection preparation exception"); | |
1253 | if (!savedError) | |
1254 | saveError(new ErrorState(ERR_CANNOT_FORWARD, Http::scInternalServerError, request.getRaw(), al)); | |
25d2603f | 1255 | retryOrBail(stepDescription); |
25b0ce45 CT |
1256 | } |
1257 | } | |
1258 | ||
1259 | /// callback handler for the connection encryptor | |
1260 | void | |
1261 | TunnelStateData::noteSecurityPeerConnectorAnswer(Security::EncryptorAnswer &answer) | |
a23223bf | 1262 | { |
2b6b1bcb AR |
1263 | encryptionWait.finish(); |
1264 | ||
25d2603f | 1265 | ErrorState *error = nullptr; |
2b6b1bcb | 1266 | assert(!answer.tunneled); |
25d2603f | 1267 | if ((error = answer.error.get())) { |
2b6b1bcb | 1268 | assert(!answer.conn); |
25d2603f EB |
1269 | answer.error.clear(); |
1270 | } else if (!Comm::IsConnOpen(answer.conn) || fd_table[answer.conn->fd].closing()) { | |
1271 | error = new ErrorState(ERR_CANNOT_FORWARD, Http::scServiceUnavailable, request.getRaw(), al); | |
1272 | closePendingConnection(answer.conn, "conn was closed while waiting for noteSecurityPeerConnectorAnswer"); | |
a23223bf CT |
1273 | } |
1274 | ||
25d2603f EB |
1275 | if (error) { |
1276 | saveError(error); | |
1277 | retryOrBail("TLS peer connection error"); | |
25b0ce45 CT |
1278 | return; |
1279 | } | |
1280 | ||
1281 | connectedToPeer(answer.conn); | |
1282 | } | |
1283 | ||
1284 | void | |
1285 | TunnelStateData::connectedToPeer(const Comm::ConnectionPointer &conn) | |
1286 | { | |
1287 | advanceDestination("establish tunnel through proxy", conn, [this,&conn] { | |
1288 | establishTunnelThruProxy(conn); | |
1289 | }); | |
1290 | } | |
1291 | ||
1292 | void | |
1293 | TunnelStateData::establishTunnelThruProxy(const Comm::ConnectionPointer &conn) | |
1294 | { | |
e5ddd4ce | 1295 | const auto callback = asyncCallback(5, 4, TunnelStateData::tunnelEstablishmentDone, this); |
25b0ce45 | 1296 | const auto tunneler = new Http::Tunneler(conn, request, callback, Config.Timeout.lifetime, al); |
f5e17947 CT |
1297 | #if USE_DELAY_POOLS |
1298 | tunneler->setDelayId(server.delayId); | |
1299 | #endif | |
2b6b1bcb | 1300 | peerWait.start(tunneler, callback); |
98ffb7e4 | 1301 | } |
33ea9fff | 1302 | |
6043e368 AR |
1303 | void |
1304 | TunnelStateData::noteDestination(Comm::ConnectionPointer path) | |
33ea9fff | 1305 | { |
55622953 | 1306 | destinationsFound = true; |
3dde9e52 CT |
1307 | |
1308 | if (!path) { // decided to use a pinned connection | |
1309 | // We can call usePinned() without fear of clashing with an earlier | |
1310 | // forwarding attempt because PINNED must be the first destination. | |
55622953 | 1311 | assert(destinations->empty()); |
3dde9e52 CT |
1312 | usePinned(); |
1313 | return; | |
1314 | } | |
1315 | ||
55622953 CT |
1316 | destinations->addPath(path); |
1317 | ||
2b6b1bcb | 1318 | if (transportWait) { |
e2bbd3b3 | 1319 | assert(!transporting()); |
55622953 CT |
1320 | notifyConnOpener(); |
1321 | return; // and continue to wait for tunnelConnectDone() callback | |
1322 | } | |
1323 | ||
e2bbd3b3 AR |
1324 | if (transporting()) |
1325 | return; // and continue to receive destinations for backup | |
1326 | ||
55622953 | 1327 | startConnecting(); |
6043e368 | 1328 | } |
62e76326 | 1329 | |
6043e368 AR |
1330 | void |
1331 | TunnelStateData::noteDestinationsEnd(ErrorState *selectionError) | |
1332 | { | |
1333 | PeerSelectionInitiator::subscribed = false; | |
55622953 CT |
1334 | destinations->destinationsFinalized = true; |
1335 | if (!destinationsFound) { | |
6b2b6cfe | 1336 | |
25d2603f EB |
1337 | // XXX: Honor clientExpectsConnectResponse() before replying. |
1338 | ||
6043e368 AR |
1339 | if (selectionError) |
1340 | return sendError(selectionError, "path selection has failed"); | |
6b2b6cfe | 1341 | |
e2bbd3b3 | 1342 | // TODO: Merge with FwdState and remove this likely unnecessary check. |
6043e368 | 1343 | if (savedError) |
e2bbd3b3 | 1344 | return sendError(savedError, "path selection found no paths (with an impossible early error)"); |
6043e368 | 1345 | |
0d55f01c | 1346 | return sendError(new ErrorState(ERR_CANNOT_FORWARD, Http::scInternalServerError, request.getRaw(), al), |
6043e368 | 1347 | "path selection found no paths"); |
db1cd23c | 1348 | } |
6043e368 AR |
1349 | // else continue to use one of the previously noted destinations; |
1350 | // if all of them fail, tunneling as whole will fail | |
1351 | Must(!selectionError); // finding at least one path means selection succeeded | |
55622953 | 1352 | |
e2bbd3b3 AR |
1353 | if (transportWait) { |
1354 | assert(!transporting()); | |
1355 | notifyConnOpener(); | |
1356 | return; // and continue to wait for the noteConnection() callback | |
1357 | } | |
1358 | ||
1359 | if (transporting()) { | |
1360 | // We are already using a previously opened connection (but were also | |
1361 | // receiving more destinations in case we need to re-forward). | |
1362 | debugs(17, 7, "keep transporting"); | |
55622953 CT |
1363 | return; |
1364 | } | |
1365 | ||
e2bbd3b3 | 1366 | // destinationsFound, but none of them worked, and we were waiting for more |
db8b598f AR |
1367 | debugs(17, 7, "no more destinations to try after " << n_tries << " failed attempts"); |
1368 | if (!savedError) { | |
1369 | // retryOrBail() must be preceded by saveError(), but in case we forgot: | |
1370 | const auto finalError = new ErrorState(ERR_CANNOT_FORWARD, Http::scBadGateway, request.getRaw(), al); | |
1371 | static const auto d = MakeNamedErrorDetail("RETRY_TO_NONE"); | |
1372 | finalError->detailError(d); | |
1373 | saveError(finalError); | |
1374 | } // else use actual error from last forwarding attempt | |
1375 | ||
e2bbd3b3 AR |
1376 | // XXX: Honor clientExpectsConnectResponse() before replying. |
1377 | sendError(savedError, "all found paths have failed"); | |
6043e368 | 1378 | } |
a37fdd8a | 1379 | |
e2bbd3b3 AR |
1380 | /// Whether a tunneling attempt to some selected destination X is in progress |
1381 | /// (after successfully opening/reusing a transport connection to X). | |
1382 | /// \sa transportWait | |
2b6b1bcb | 1383 | bool |
e2bbd3b3 | 1384 | TunnelStateData::transporting() const |
2b6b1bcb | 1385 | { |
e2bbd3b3 | 1386 | return encryptionWait || peerWait || committedToServer; |
2b6b1bcb AR |
1387 | } |
1388 | ||
6043e368 AR |
1389 | /// remembers an error to be used if there will be no more connection attempts |
1390 | void | |
1391 | TunnelStateData::saveError(ErrorState *error) | |
1392 | { | |
1393 | debugs(26, 4, savedError << " ? " << error); | |
1394 | assert(error); | |
1395 | delete savedError; // may be nil | |
1396 | savedError = error; | |
1397 | } | |
1398 | ||
1399 | /// Starts sending the given error message to the client, leading to the | |
1400 | /// eventual transaction termination. Call with savedError to send savedError. | |
1401 | void | |
1402 | TunnelStateData::sendError(ErrorState *finalError, const char *reason) | |
1403 | { | |
1404 | debugs(26, 3, "aborting transaction for " << reason); | |
1405 | ||
1406 | if (request) | |
1407 | request->hier.stopPeerClock(false); | |
1408 | ||
2b6b1bcb | 1409 | cancelStep(reason); |
55622953 | 1410 | |
6043e368 | 1411 | assert(finalError); |
16b70e2a | 1412 | |
6043e368 AR |
1413 | // get rid of any cached error unless that is what the caller is sending |
1414 | if (savedError != finalError) | |
1415 | delete savedError; // may be nil | |
1416 | savedError = nullptr; | |
62e76326 | 1417 | |
6043e368 AR |
1418 | // we cannot try other destinations after responding with an error |
1419 | PeerSelectionInitiator::subscribed = false; // may already be false | |
1420 | ||
1421 | *status_ptr = finalError->httpStatus; | |
1422 | finalError->callback = tunnelErrorComplete; | |
1423 | finalError->callback_data = this; | |
1424 | errorSend(client.conn, finalError); | |
0ce8e93b EB |
1425 | } |
1426 | ||
2b6b1bcb AR |
1427 | /// Notify a pending subtask, if any, that we no longer need its help. We do not |
1428 | /// have to do this -- the subtask job will eventually end -- but ending it | |
1429 | /// earlier reduces waste and may reduce DoS attack surface. | |
55622953 | 1430 | void |
2b6b1bcb | 1431 | TunnelStateData::cancelStep(const char *reason) |
55622953 | 1432 | { |
2b6b1bcb AR |
1433 | transportWait.cancel(reason); |
1434 | encryptionWait.cancel(reason); | |
1435 | peerWait.cancel(reason); | |
55622953 CT |
1436 | } |
1437 | ||
0ce8e93b EB |
1438 | void |
1439 | TunnelStateData::startConnecting() | |
1440 | { | |
6043e368 AR |
1441 | if (request) |
1442 | request->hier.startPeerClock(); | |
1443 | ||
55622953 | 1444 | assert(!destinations->empty()); |
e2bbd3b3 | 1445 | assert(!transporting()); |
a98270b0 EB |
1446 | |
1447 | delete savedError; // may still be nil | |
1448 | savedError = nullptr; | |
1449 | request->hier.peer_reply_status = Http::scNone; // TODO: Move to startPeerClock()? | |
1450 | ||
e5ddd4ce | 1451 | const auto callback = asyncCallback(17, 5, TunnelStateData::noteConnection, this); |
a98270b0 | 1452 | const auto cs = new HappyConnOpener(destinations, callback, request, startTime, n_tries, al); |
55622953 CT |
1453 | cs->setHost(request->url.host()); |
1454 | cs->setRetriable(false); | |
1455 | cs->allowPersistent(false); | |
1456 | destinations->notificationPending = true; // start() is async | |
2b6b1bcb | 1457 | transportWait.start(cs, callback); |
33ea9fff | 1458 | } |
a46d2c0e | 1459 | |
3dde9e52 CT |
1460 | /// send request on an existing connection dedicated to the requesting client |
1461 | void | |
1462 | TunnelStateData::usePinned() | |
1463 | { | |
55622953 CT |
1464 | Must(request); |
1465 | const auto connManager = request->pinnedConnection(); | |
0dc19a63 A |
1466 | Comm::ConnectionPointer serverConn = nullptr; |
1467 | ||
daf80700 | 1468 | try { |
0dc19a63 | 1469 | serverConn = ConnStateData::BorrowPinnedConnection(request.getRaw(), al); |
daf80700 | 1470 | debugs(26, 7, "pinned peer connection: " << serverConn); |
daf80700 CT |
1471 | } catch (ErrorState * const error) { |
1472 | syncHierNote(nullptr, connManager ? connManager->pinning.host : request->url.host()); | |
25d2603f | 1473 | // XXX: Honor clientExpectsConnectResponse() before replying. |
3dde9e52 | 1474 | // a PINNED path failure is fatal; do not wait for more paths |
daf80700 | 1475 | sendError(error, "pinned path failure"); |
3dde9e52 CT |
1476 | return; |
1477 | } | |
1478 | ||
0dc19a63 A |
1479 | updateAttempts(n_tries + 1); |
1480 | ||
1481 | // Set HttpRequest pinned related flags for consistency even if | |
1482 | // they are not really used by tunnel.cc code. | |
1483 | request->flags.pinned = true; | |
1484 | ||
1485 | Assure(connManager); | |
1486 | if (connManager->pinnedAuth()) | |
1487 | request->flags.auth = true; | |
1488 | ||
1489 | // the server may close the pinned connection before this request | |
1490 | const auto reused = true; | |
1491 | connectDone(serverConn, connManager->pinning.host, reused); | |
3dde9e52 CT |
1492 | } |
1493 | ||
fa34dd97 | 1494 | CBDATA_CLASS_INIT(TunnelStateData); |
a46d2c0e | 1495 | |
a46d2c0e | 1496 | bool |
fa34dd97 | 1497 | TunnelStateData::noConnections() const |
a46d2c0e | 1498 | { |
97c81191 | 1499 | return !Comm::IsConnOpen(server.conn) && !Comm::IsConnOpen(client.conn); |
a46d2c0e | 1500 | } |
1501 | ||
9a0a18de | 1502 | #if USE_DELAY_POOLS |
a46d2c0e | 1503 | void |
fa34dd97 | 1504 | TunnelStateData::Connection::setDelayId(DelayId const &newDelay) |
a46d2c0e | 1505 | { |
1506 | delayId = newDelay; | |
1507 | } | |
1508 | ||
1509 | #endif | |
93ead3fd | 1510 | |
2b6b1bcb | 1511 | /// makes sure connection opener knows that the destinations have changed |
55622953 CT |
1512 | void |
1513 | TunnelStateData::notifyConnOpener() | |
1514 | { | |
1515 | if (destinations->notificationPending) { | |
1516 | debugs(17, 7, "reusing pending notification"); | |
1517 | } else { | |
1518 | destinations->notificationPending = true; | |
2b6b1bcb | 1519 | CallJobHere(17, 5, transportWait.job(), HappyConnOpener, noteCandidatesChange); |
55622953 CT |
1520 | } |
1521 | } | |
1522 | ||
1c2b4465 CT |
1523 | /** |
1524 | * Sets up a TCP tunnel through Squid and starts shoveling traffic. | |
1525 | * \param request the request that initiated/caused this tunnel | |
1526 | * \param clientConn the already accepted client-to-Squid TCP connection | |
1527 | * \param srvConn the already established Squid-to-server TCP connection | |
1528 | * \param preReadServerData server-sent bytes to be forwarded to the client | |
1529 | */ | |
93ead3fd | 1530 | void |
1c2b4465 | 1531 | switchToTunnel(HttpRequest *request, const Comm::ConnectionPointer &clientConn, const Comm::ConnectionPointer &srvConn, const SBuf &preReadServerData) |
93ead3fd | 1532 | { |
25b0ce45 CT |
1533 | Must(Comm::IsConnOpen(clientConn)); |
1534 | Must(Comm::IsConnOpen(srvConn)); | |
1535 | ||
c91d4d4e | 1536 | debugs(26,5, "Revert to tunnel FD " << clientConn->fd << " with FD " << srvConn->fd); |
93ead3fd | 1537 | |
6b2b6cfe | 1538 | /* Create state structure. */ |
93ead3fd CT |
1539 | ++statCounter.server.all.requests; |
1540 | ++statCounter.server.other.requests; | |
1541 | ||
6b2b6cfe CT |
1542 | auto conn = request->clientConnectionManager.get(); |
1543 | Must(conn); | |
1544 | Http::StreamPointer context = conn->pipeline.front(); | |
1545 | Must(context && context->http); | |
a95989ed | 1546 | |
6b2b6cfe | 1547 | debugs(26, 3, request->method << " " << context->http->uri << " " << request->http_ver); |
a95989ed | 1548 | |
6b2b6cfe | 1549 | TunnelStateData *tunnelState = new TunnelStateData(context->http); |
e2bbd3b3 | 1550 | tunnelState->commitToServer(srvConn); |
93ead3fd | 1551 | |
d8165775 | 1552 | request->hier.resetPeerNotes(srvConn, tunnelState->getHost()); |
93ead3fd | 1553 | |
6b2b6cfe CT |
1554 | #if USE_DELAY_POOLS |
1555 | /* no point using the delayIsNoDelay stuff since tunnel is nice and simple */ | |
f5e17947 | 1556 | if (!srvConn->getPeer() || !srvConn->getPeer()->options.no_delay) |
6b2b6cfe CT |
1557 | tunnelState->server.setDelayId(DelayId::DelayClient(context->http)); |
1558 | #endif | |
1559 | ||
f53e6e84 | 1560 | request->peer_host = srvConn->getPeer() ? srvConn->getPeer()->host : nullptr; |
93ead3fd | 1561 | |
e4f14091 | 1562 | debugs(26, 4, "determine post-connect handling pathway."); |
f5e17947 CT |
1563 | if (const auto peer = srvConn->getPeer()) |
1564 | request->prepForPeering(*peer); | |
1565 | else | |
1566 | request->prepForDirect(); | |
93ead3fd | 1567 | |
1c2b4465 | 1568 | tunnelState->preReadServerData = preReadServerData; |
93ead3fd | 1569 | |
6821c276 | 1570 | tunnelStartShoveling(tunnelState); |
93ead3fd | 1571 | } |
f53969cc | 1572 |