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| 1 /* | |
| 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #include <memory> | |
| 12 | |
| 13 #if defined(WEBRTC_WIN) | |
| 14 #include "webrtc/base/win32.h" | |
| 15 #else // !WEBRTC_WIN | |
| 16 #define SEC_E_CERT_EXPIRED (-2146893016) | |
| 17 #endif // !WEBRTC_WIN | |
| 18 | |
| 19 #include "webrtc/base/checks.h" | |
| 20 #include "webrtc/base/httpbase.h" | |
| 21 #include "webrtc/base/logging.h" | |
| 22 #include "webrtc/base/socket.h" | |
| 23 #include "webrtc/base/stringutils.h" | |
| 24 #include "webrtc/base/thread.h" | |
| 25 | |
| 26 namespace rtc { | |
| 27 | |
| 28 ////////////////////////////////////////////////////////////////////// | |
| 29 // Helpers | |
| 30 ////////////////////////////////////////////////////////////////////// | |
| 31 | |
| 32 bool MatchHeader(const char* str, size_t len, HttpHeader header) { | |
| 33 const char* const header_str = ToString(header); | |
| 34 const size_t header_len = strlen(header_str); | |
| 35 return (len == header_len) && (_strnicmp(str, header_str, header_len) == 0); | |
| 36 } | |
| 37 | |
| 38 enum { | |
| 39 MSG_READ | |
| 40 }; | |
| 41 | |
| 42 ////////////////////////////////////////////////////////////////////// | |
| 43 // HttpParser | |
| 44 ////////////////////////////////////////////////////////////////////// | |
| 45 | |
| 46 HttpParser::HttpParser() { | |
| 47 reset(); | |
| 48 } | |
| 49 | |
| 50 HttpParser::~HttpParser() { | |
| 51 } | |
| 52 | |
| 53 void | |
| 54 HttpParser::reset() { | |
| 55 state_ = ST_LEADER; | |
| 56 chunked_ = false; | |
| 57 data_size_ = SIZE_UNKNOWN; | |
| 58 } | |
| 59 | |
| 60 HttpParser::ProcessResult | |
| 61 HttpParser::Process(const char* buffer, size_t len, size_t* processed, | |
| 62 HttpError* error) { | |
| 63 *processed = 0; | |
| 64 *error = HE_NONE; | |
| 65 | |
| 66 if (state_ >= ST_COMPLETE) { | |
| 67 RTC_NOTREACHED(); | |
| 68 return PR_COMPLETE; | |
| 69 } | |
| 70 | |
| 71 while (true) { | |
| 72 if (state_ < ST_DATA) { | |
| 73 size_t pos = *processed; | |
| 74 while ((pos < len) && (buffer[pos] != '\n')) { | |
| 75 pos += 1; | |
| 76 } | |
| 77 if (pos >= len) { | |
| 78 break; // don't have a full header | |
| 79 } | |
| 80 const char* line = buffer + *processed; | |
| 81 size_t len = (pos - *processed); | |
| 82 *processed = pos + 1; | |
| 83 while ((len > 0) && isspace(static_cast<unsigned char>(line[len-1]))) { | |
| 84 len -= 1; | |
| 85 } | |
| 86 ProcessResult result = ProcessLine(line, len, error); | |
| 87 LOG(LS_VERBOSE) << "Processed line, result=" << result; | |
| 88 | |
| 89 if (PR_CONTINUE != result) { | |
| 90 return result; | |
| 91 } | |
| 92 } else if (data_size_ == 0) { | |
| 93 if (chunked_) { | |
| 94 state_ = ST_CHUNKTERM; | |
| 95 } else { | |
| 96 return PR_COMPLETE; | |
| 97 } | |
| 98 } else { | |
| 99 size_t available = len - *processed; | |
| 100 if (available <= 0) { | |
| 101 break; // no more data | |
| 102 } | |
| 103 if ((data_size_ != SIZE_UNKNOWN) && (available > data_size_)) { | |
| 104 available = data_size_; | |
| 105 } | |
| 106 size_t read = 0; | |
| 107 ProcessResult result = ProcessData(buffer + *processed, available, read, | |
| 108 error); | |
| 109 LOG(LS_VERBOSE) << "Processed data, result: " << result << " read: " | |
| 110 << read << " err: " << error; | |
| 111 | |
| 112 if (PR_CONTINUE != result) { | |
| 113 return result; | |
| 114 } | |
| 115 *processed += read; | |
| 116 if (data_size_ != SIZE_UNKNOWN) { | |
| 117 data_size_ -= read; | |
| 118 } | |
| 119 } | |
| 120 } | |
| 121 | |
| 122 return PR_CONTINUE; | |
| 123 } | |
| 124 | |
| 125 HttpParser::ProcessResult | |
| 126 HttpParser::ProcessLine(const char* line, size_t len, HttpError* error) { | |
| 127 LOG_F(LS_VERBOSE) << " state: " << state_ << " line: " | |
| 128 << std::string(line, len) << " len: " << len << " err: " | |
| 129 << error; | |
| 130 | |
| 131 switch (state_) { | |
| 132 case ST_LEADER: | |
| 133 state_ = ST_HEADERS; | |
| 134 return ProcessLeader(line, len, error); | |
| 135 | |
| 136 case ST_HEADERS: | |
| 137 if (len > 0) { | |
| 138 const char* value = strchrn(line, len, ':'); | |
| 139 if (!value) { | |
| 140 *error = HE_PROTOCOL; | |
| 141 return PR_COMPLETE; | |
| 142 } | |
| 143 size_t nlen = (value - line); | |
| 144 const char* eol = line + len; | |
| 145 do { | |
| 146 value += 1; | |
| 147 } while ((value < eol) && isspace(static_cast<unsigned char>(*value))); | |
| 148 size_t vlen = eol - value; | |
| 149 if (MatchHeader(line, nlen, HH_CONTENT_LENGTH)) { | |
| 150 // sscanf isn't safe with strings that aren't null-terminated, and there | |
| 151 // is no guarantee that |value| is. | |
| 152 // Create a local copy that is null-terminated. | |
| 153 std::string value_str(value, vlen); | |
| 154 unsigned int temp_size; | |
| 155 if (sscanf(value_str.c_str(), "%u", &temp_size) != 1) { | |
| 156 *error = HE_PROTOCOL; | |
| 157 return PR_COMPLETE; | |
| 158 } | |
| 159 data_size_ = static_cast<size_t>(temp_size); | |
| 160 } else if (MatchHeader(line, nlen, HH_TRANSFER_ENCODING)) { | |
| 161 if ((vlen == 7) && (_strnicmp(value, "chunked", 7) == 0)) { | |
| 162 chunked_ = true; | |
| 163 } else if ((vlen == 8) && (_strnicmp(value, "identity", 8) == 0)) { | |
| 164 chunked_ = false; | |
| 165 } else { | |
| 166 *error = HE_PROTOCOL; | |
| 167 return PR_COMPLETE; | |
| 168 } | |
| 169 } | |
| 170 return ProcessHeader(line, nlen, value, vlen, error); | |
| 171 } else { | |
| 172 state_ = chunked_ ? ST_CHUNKSIZE : ST_DATA; | |
| 173 return ProcessHeaderComplete(chunked_, data_size_, error); | |
| 174 } | |
| 175 break; | |
| 176 | |
| 177 case ST_CHUNKSIZE: | |
| 178 if (len > 0) { | |
| 179 char* ptr = nullptr; | |
| 180 data_size_ = strtoul(line, &ptr, 16); | |
| 181 if (ptr != line + len) { | |
| 182 *error = HE_PROTOCOL; | |
| 183 return PR_COMPLETE; | |
| 184 } | |
| 185 state_ = (data_size_ == 0) ? ST_TRAILERS : ST_DATA; | |
| 186 } else { | |
| 187 *error = HE_PROTOCOL; | |
| 188 return PR_COMPLETE; | |
| 189 } | |
| 190 break; | |
| 191 | |
| 192 case ST_CHUNKTERM: | |
| 193 if (len > 0) { | |
| 194 *error = HE_PROTOCOL; | |
| 195 return PR_COMPLETE; | |
| 196 } else { | |
| 197 state_ = chunked_ ? ST_CHUNKSIZE : ST_DATA; | |
| 198 } | |
| 199 break; | |
| 200 | |
| 201 case ST_TRAILERS: | |
| 202 if (len == 0) { | |
| 203 return PR_COMPLETE; | |
| 204 } | |
| 205 // *error = onHttpRecvTrailer(); | |
| 206 break; | |
| 207 | |
| 208 default: | |
| 209 RTC_NOTREACHED(); | |
| 210 break; | |
| 211 } | |
| 212 | |
| 213 return PR_CONTINUE; | |
| 214 } | |
| 215 | |
| 216 bool | |
| 217 HttpParser::is_valid_end_of_input() const { | |
| 218 return (state_ == ST_DATA) && (data_size_ == SIZE_UNKNOWN); | |
| 219 } | |
| 220 | |
| 221 void | |
| 222 HttpParser::complete(HttpError error) { | |
| 223 if (state_ < ST_COMPLETE) { | |
| 224 state_ = ST_COMPLETE; | |
| 225 OnComplete(error); | |
| 226 } | |
| 227 } | |
| 228 | |
| 229 ////////////////////////////////////////////////////////////////////// | |
| 230 // HttpBase::DocumentStream | |
| 231 ////////////////////////////////////////////////////////////////////// | |
| 232 | |
| 233 class BlockingMemoryStream : public ExternalMemoryStream { | |
| 234 public: | |
| 235 BlockingMemoryStream(char* buffer, size_t size) | |
| 236 : ExternalMemoryStream(buffer, size) { } | |
| 237 | |
| 238 StreamResult DoReserve(size_t size, int* error) override { | |
| 239 return (buffer_length_ >= size) ? SR_SUCCESS : SR_BLOCK; | |
| 240 } | |
| 241 }; | |
| 242 | |
| 243 class HttpBase::DocumentStream : public StreamInterface { | |
| 244 public: | |
| 245 DocumentStream(HttpBase* base) : base_(base), error_(HE_DEFAULT) { } | |
| 246 | |
| 247 StreamState GetState() const override { | |
| 248 if (nullptr == base_) | |
| 249 return SS_CLOSED; | |
| 250 if (HM_RECV == base_->mode_) | |
| 251 return SS_OPEN; | |
| 252 return SS_OPENING; | |
| 253 } | |
| 254 | |
| 255 StreamResult Read(void* buffer, | |
| 256 size_t buffer_len, | |
| 257 size_t* read, | |
| 258 int* error) override { | |
| 259 if (!base_) { | |
| 260 if (error) *error = error_; | |
| 261 return (HE_NONE == error_) ? SR_EOS : SR_ERROR; | |
| 262 } | |
| 263 | |
| 264 if (HM_RECV != base_->mode_) { | |
| 265 return SR_BLOCK; | |
| 266 } | |
| 267 | |
| 268 // DoReceiveLoop writes http document data to the StreamInterface* document | |
| 269 // member of HttpData. In this case, we want this data to be written | |
| 270 // directly to our buffer. To accomplish this, we wrap our buffer with a | |
| 271 // StreamInterface, and replace the existing document with our wrapper. | |
| 272 // When the method returns, we restore the old document. Ideally, we would | |
| 273 // pass our StreamInterface* to DoReceiveLoop, but due to the callbacks | |
| 274 // of HttpParser, we would still need to store the pointer temporarily. | |
| 275 std::unique_ptr<StreamInterface> stream( | |
| 276 new BlockingMemoryStream(reinterpret_cast<char*>(buffer), buffer_len)); | |
| 277 | |
| 278 // Replace the existing document with our wrapped buffer. | |
| 279 base_->data_->document.swap(stream); | |
| 280 | |
| 281 // Pump the I/O loop. DoReceiveLoop is guaranteed not to attempt to | |
| 282 // complete the I/O process, which means that our wrapper is not in danger | |
| 283 // of being deleted. To ensure this, DoReceiveLoop returns true when it | |
| 284 // wants complete to be called. We make sure to uninstall our wrapper | |
| 285 // before calling complete(). | |
| 286 HttpError http_error; | |
| 287 bool complete = base_->DoReceiveLoop(&http_error); | |
| 288 | |
| 289 // Reinstall the original output document. | |
| 290 base_->data_->document.swap(stream); | |
| 291 | |
| 292 // If we reach the end of the receive stream, we disconnect our stream | |
| 293 // adapter from the HttpBase, and further calls to read will either return | |
| 294 // EOS or ERROR, appropriately. Finally, we call complete(). | |
| 295 StreamResult result = SR_BLOCK; | |
| 296 if (complete) { | |
| 297 HttpBase* base = Disconnect(http_error); | |
| 298 if (error) *error = error_; | |
| 299 result = (HE_NONE == error_) ? SR_EOS : SR_ERROR; | |
| 300 base->complete(http_error); | |
| 301 } | |
| 302 | |
| 303 // Even if we are complete, if some data was read we must return SUCCESS. | |
| 304 // Future Reads will return EOS or ERROR based on the error_ variable. | |
| 305 size_t position; | |
| 306 stream->GetPosition(&position); | |
| 307 if (position > 0) { | |
| 308 if (read) *read = position; | |
| 309 result = SR_SUCCESS; | |
| 310 } | |
| 311 return result; | |
| 312 } | |
| 313 | |
| 314 StreamResult Write(const void* data, | |
| 315 size_t data_len, | |
| 316 size_t* written, | |
| 317 int* error) override { | |
| 318 if (error) *error = -1; | |
| 319 return SR_ERROR; | |
| 320 } | |
| 321 | |
| 322 void Close() override { | |
| 323 if (base_) { | |
| 324 HttpBase* base = Disconnect(HE_NONE); | |
| 325 if (HM_RECV == base->mode_ && base->http_stream_) { | |
| 326 // Read I/O could have been stalled on the user of this DocumentStream, | |
| 327 // so restart the I/O process now that we've removed ourselves. | |
| 328 base->http_stream_->PostEvent(SE_READ, 0); | |
| 329 } | |
| 330 } | |
| 331 } | |
| 332 | |
| 333 bool GetAvailable(size_t* size) const override { | |
| 334 if (!base_ || HM_RECV != base_->mode_) | |
| 335 return false; | |
| 336 size_t data_size = base_->GetDataRemaining(); | |
| 337 if (SIZE_UNKNOWN == data_size) | |
| 338 return false; | |
| 339 if (size) | |
| 340 *size = data_size; | |
| 341 return true; | |
| 342 } | |
| 343 | |
| 344 HttpBase* Disconnect(HttpError error) { | |
| 345 RTC_DCHECK(nullptr != base_); | |
| 346 RTC_DCHECK(nullptr != base_->doc_stream_); | |
| 347 HttpBase* base = base_; | |
| 348 base_->doc_stream_ = nullptr; | |
| 349 base_ = nullptr; | |
| 350 error_ = error; | |
| 351 return base; | |
| 352 } | |
| 353 | |
| 354 private: | |
| 355 HttpBase* base_; | |
| 356 HttpError error_; | |
| 357 }; | |
| 358 | |
| 359 ////////////////////////////////////////////////////////////////////// | |
| 360 // HttpBase | |
| 361 ////////////////////////////////////////////////////////////////////// | |
| 362 | |
| 363 HttpBase::HttpBase() | |
| 364 : mode_(HM_NONE), | |
| 365 data_(nullptr), | |
| 366 notify_(nullptr), | |
| 367 http_stream_(nullptr), | |
| 368 doc_stream_(nullptr) {} | |
| 369 | |
| 370 HttpBase::~HttpBase() { | |
| 371 RTC_DCHECK(HM_NONE == mode_); | |
| 372 } | |
| 373 | |
| 374 bool | |
| 375 HttpBase::isConnected() const { | |
| 376 return (http_stream_ != nullptr) && (http_stream_->GetState() == SS_OPEN); | |
| 377 } | |
| 378 | |
| 379 bool | |
| 380 HttpBase::attach(StreamInterface* stream) { | |
| 381 if ((mode_ != HM_NONE) || (http_stream_ != nullptr) || (stream == nullptr)) { | |
| 382 RTC_NOTREACHED(); | |
| 383 return false; | |
| 384 } | |
| 385 http_stream_ = stream; | |
| 386 http_stream_->SignalEvent.connect(this, &HttpBase::OnHttpStreamEvent); | |
| 387 mode_ = (http_stream_->GetState() == SS_OPENING) ? HM_CONNECT : HM_NONE; | |
| 388 return true; | |
| 389 } | |
| 390 | |
| 391 StreamInterface* | |
| 392 HttpBase::detach() { | |
| 393 RTC_DCHECK(HM_NONE == mode_); | |
| 394 if (mode_ != HM_NONE) { | |
| 395 return nullptr; | |
| 396 } | |
| 397 StreamInterface* stream = http_stream_; | |
| 398 http_stream_ = nullptr; | |
| 399 if (stream) { | |
| 400 stream->SignalEvent.disconnect(this); | |
| 401 } | |
| 402 return stream; | |
| 403 } | |
| 404 | |
| 405 void | |
| 406 HttpBase::send(HttpData* data) { | |
| 407 RTC_DCHECK(HM_NONE == mode_); | |
| 408 if (mode_ != HM_NONE) { | |
| 409 return; | |
| 410 } else if (!isConnected()) { | |
| 411 OnHttpStreamEvent(http_stream_, SE_CLOSE, HE_DISCONNECTED); | |
| 412 return; | |
| 413 } | |
| 414 | |
| 415 mode_ = HM_SEND; | |
| 416 data_ = data; | |
| 417 len_ = 0; | |
| 418 ignore_data_ = chunk_data_ = false; | |
| 419 | |
| 420 if (data_->document) { | |
| 421 data_->document->SignalEvent.connect(this, &HttpBase::OnDocumentEvent); | |
| 422 } | |
| 423 | |
| 424 std::string encoding; | |
| 425 if (data_->hasHeader(HH_TRANSFER_ENCODING, &encoding) | |
| 426 && (encoding == "chunked")) { | |
| 427 chunk_data_ = true; | |
| 428 } | |
| 429 | |
| 430 len_ = data_->formatLeader(buffer_, sizeof(buffer_)); | |
| 431 len_ += strcpyn(buffer_ + len_, sizeof(buffer_) - len_, "\r\n"); | |
| 432 | |
| 433 header_ = data_->begin(); | |
| 434 if (header_ == data_->end()) { | |
| 435 // We must call this at least once, in the case where there are no headers. | |
| 436 queue_headers(); | |
| 437 } | |
| 438 | |
| 439 flush_data(); | |
| 440 } | |
| 441 | |
| 442 void | |
| 443 HttpBase::recv(HttpData* data) { | |
| 444 RTC_DCHECK(HM_NONE == mode_); | |
| 445 if (mode_ != HM_NONE) { | |
| 446 return; | |
| 447 } else if (!isConnected()) { | |
| 448 OnHttpStreamEvent(http_stream_, SE_CLOSE, HE_DISCONNECTED); | |
| 449 return; | |
| 450 } | |
| 451 | |
| 452 mode_ = HM_RECV; | |
| 453 data_ = data; | |
| 454 len_ = 0; | |
| 455 ignore_data_ = chunk_data_ = false; | |
| 456 | |
| 457 reset(); | |
| 458 if (doc_stream_) { | |
| 459 doc_stream_->SignalEvent(doc_stream_, SE_OPEN | SE_READ, 0); | |
| 460 } else { | |
| 461 read_and_process_data(); | |
| 462 } | |
| 463 } | |
| 464 | |
| 465 void | |
| 466 HttpBase::abort(HttpError err) { | |
| 467 if (mode_ != HM_NONE) { | |
| 468 if (http_stream_ != nullptr) { | |
| 469 http_stream_->Close(); | |
| 470 } | |
| 471 do_complete(err); | |
| 472 } | |
| 473 } | |
| 474 | |
| 475 StreamInterface* HttpBase::GetDocumentStream() { | |
| 476 if (doc_stream_) | |
| 477 return nullptr; | |
| 478 doc_stream_ = new DocumentStream(this); | |
| 479 return doc_stream_; | |
| 480 } | |
| 481 | |
| 482 HttpError HttpBase::HandleStreamClose(int error) { | |
| 483 if (http_stream_ != nullptr) { | |
| 484 http_stream_->Close(); | |
| 485 } | |
| 486 if (error == 0) { | |
| 487 if ((mode_ == HM_RECV) && is_valid_end_of_input()) { | |
| 488 return HE_NONE; | |
| 489 } else { | |
| 490 return HE_DISCONNECTED; | |
| 491 } | |
| 492 } else if (error == SOCKET_EACCES) { | |
| 493 return HE_AUTH; | |
| 494 } else if (error == SEC_E_CERT_EXPIRED) { | |
| 495 return HE_CERTIFICATE_EXPIRED; | |
| 496 } | |
| 497 LOG_F(LS_ERROR) << "(" << error << ")"; | |
| 498 return (HM_CONNECT == mode_) ? HE_CONNECT_FAILED : HE_SOCKET_ERROR; | |
| 499 } | |
| 500 | |
| 501 bool HttpBase::DoReceiveLoop(HttpError* error) { | |
| 502 RTC_DCHECK(HM_RECV == mode_); | |
| 503 RTC_DCHECK(nullptr != error); | |
| 504 | |
| 505 // Do to the latency between receiving read notifications from | |
| 506 // pseudotcpchannel, we rely on repeated calls to read in order to acheive | |
| 507 // ideal throughput. The number of reads is limited to prevent starving | |
| 508 // the caller. | |
| 509 | |
| 510 size_t loop_count = 0; | |
| 511 const size_t kMaxReadCount = 20; | |
| 512 bool process_requires_more_data = false; | |
| 513 do { | |
| 514 // The most frequent use of this function is response to new data available | |
| 515 // on http_stream_. Therefore, we optimize by attempting to read from the | |
| 516 // network first (as opposed to processing existing data first). | |
| 517 | |
| 518 if (len_ < sizeof(buffer_)) { | |
| 519 // Attempt to buffer more data. | |
| 520 size_t read; | |
| 521 int read_error; | |
| 522 StreamResult read_result = http_stream_->Read(buffer_ + len_, | |
| 523 sizeof(buffer_) - len_, | |
| 524 &read, &read_error); | |
| 525 switch (read_result) { | |
| 526 case SR_SUCCESS: | |
| 527 RTC_DCHECK(len_ + read <= sizeof(buffer_)); | |
| 528 len_ += read; | |
| 529 break; | |
| 530 case SR_BLOCK: | |
| 531 if (process_requires_more_data) { | |
| 532 // We're can't make progress until more data is available. | |
| 533 return false; | |
| 534 } | |
| 535 // Attempt to process the data already in our buffer. | |
| 536 break; | |
| 537 case SR_EOS: | |
| 538 // Clean close, with no error. | |
| 539 read_error = 0; | |
| 540 FALLTHROUGH(); // Fall through to HandleStreamClose. | |
| 541 case SR_ERROR: | |
| 542 *error = HandleStreamClose(read_error); | |
| 543 return true; | |
| 544 } | |
| 545 } else if (process_requires_more_data) { | |
| 546 // We have too much unprocessed data in our buffer. This should only | |
| 547 // occur when a single HTTP header is longer than the buffer size (32K). | |
| 548 // Anything longer than that is almost certainly an error. | |
| 549 *error = HE_OVERFLOW; | |
| 550 return true; | |
| 551 } | |
| 552 | |
| 553 // Process data in our buffer. Process is not guaranteed to process all | |
| 554 // the buffered data. In particular, it will wait until a complete | |
| 555 // protocol element (such as http header, or chunk size) is available, | |
| 556 // before processing it in its entirety. Also, it is valid and sometimes | |
| 557 // necessary to call Process with an empty buffer, since the state machine | |
| 558 // may have interrupted state transitions to complete. | |
| 559 size_t processed; | |
| 560 ProcessResult process_result = Process(buffer_, len_, &processed, | |
| 561 error); | |
| 562 RTC_DCHECK(processed <= len_); | |
| 563 len_ -= processed; | |
| 564 memmove(buffer_, buffer_ + processed, len_); | |
| 565 switch (process_result) { | |
| 566 case PR_CONTINUE: | |
| 567 // We need more data to make progress. | |
| 568 process_requires_more_data = true; | |
| 569 break; | |
| 570 case PR_BLOCK: | |
| 571 // We're stalled on writing the processed data. | |
| 572 return false; | |
| 573 case PR_COMPLETE: | |
| 574 // *error already contains the correct code. | |
| 575 return true; | |
| 576 } | |
| 577 } while (++loop_count <= kMaxReadCount); | |
| 578 | |
| 579 LOG_F(LS_WARNING) << "danger of starvation"; | |
| 580 return false; | |
| 581 } | |
| 582 | |
| 583 void | |
| 584 HttpBase::read_and_process_data() { | |
| 585 HttpError error; | |
| 586 if (DoReceiveLoop(&error)) { | |
| 587 complete(error); | |
| 588 } | |
| 589 } | |
| 590 | |
| 591 void | |
| 592 HttpBase::flush_data() { | |
| 593 RTC_DCHECK(HM_SEND == mode_); | |
| 594 | |
| 595 // When send_required is true, no more buffering can occur without a network | |
| 596 // write. | |
| 597 bool send_required = (len_ >= sizeof(buffer_)); | |
| 598 | |
| 599 while (true) { | |
| 600 RTC_DCHECK(len_ <= sizeof(buffer_)); | |
| 601 | |
| 602 // HTTP is inherently sensitive to round trip latency, since a frequent use | |
| 603 // case is for small requests and responses to be sent back and forth, and | |
| 604 // the lack of pipelining forces a single request to take a minimum of the | |
| 605 // round trip time. As a result, it is to our benefit to pack as much data | |
| 606 // into each packet as possible. Thus, we defer network writes until we've | |
| 607 // buffered as much data as possible. | |
| 608 | |
| 609 if (!send_required && (header_ != data_->end())) { | |
| 610 // First, attempt to queue more header data. | |
| 611 send_required = queue_headers(); | |
| 612 } | |
| 613 | |
| 614 if (!send_required && data_->document) { | |
| 615 // Next, attempt to queue document data. | |
| 616 | |
| 617 const size_t kChunkDigits = 8; | |
| 618 size_t offset, reserve; | |
| 619 if (chunk_data_) { | |
| 620 // Reserve characters at the start for X-byte hex value and \r\n | |
| 621 offset = len_ + kChunkDigits + 2; | |
| 622 // ... and 2 characters at the end for \r\n | |
| 623 reserve = offset + 2; | |
| 624 } else { | |
| 625 offset = len_; | |
| 626 reserve = offset; | |
| 627 } | |
| 628 | |
| 629 if (reserve >= sizeof(buffer_)) { | |
| 630 send_required = true; | |
| 631 } else { | |
| 632 size_t read; | |
| 633 int error; | |
| 634 StreamResult result = data_->document->Read(buffer_ + offset, | |
| 635 sizeof(buffer_) - reserve, | |
| 636 &read, &error); | |
| 637 if (result == SR_SUCCESS) { | |
| 638 RTC_DCHECK(reserve + read <= sizeof(buffer_)); | |
| 639 if (chunk_data_) { | |
| 640 // Prepend the chunk length in hex. | |
| 641 // Note: sprintfn appends a null terminator, which is why we can't | |
| 642 // combine it with the line terminator. | |
| 643 sprintfn(buffer_ + len_, kChunkDigits + 1, "%.*x", | |
| 644 kChunkDigits, read); | |
| 645 // Add line terminator to the chunk length. | |
| 646 memcpy(buffer_ + len_ + kChunkDigits, "\r\n", 2); | |
| 647 // Add line terminator to the end of the chunk. | |
| 648 memcpy(buffer_ + offset + read, "\r\n", 2); | |
| 649 } | |
| 650 len_ = reserve + read; | |
| 651 } else if (result == SR_BLOCK) { | |
| 652 // Nothing to do but flush data to the network. | |
| 653 send_required = true; | |
| 654 } else if (result == SR_EOS) { | |
| 655 if (chunk_data_) { | |
| 656 // Append the empty chunk and empty trailers, then turn off | |
| 657 // chunking. | |
| 658 RTC_DCHECK(len_ + 5 <= sizeof(buffer_)); | |
| 659 memcpy(buffer_ + len_, "0\r\n\r\n", 5); | |
| 660 len_ += 5; | |
| 661 chunk_data_ = false; | |
| 662 } else if (0 == len_) { | |
| 663 // No more data to read, and no more data to write. | |
| 664 do_complete(); | |
| 665 return; | |
| 666 } | |
| 667 // Although we are done reading data, there is still data which needs | |
| 668 // to be flushed to the network. | |
| 669 send_required = true; | |
| 670 } else { | |
| 671 LOG_F(LS_ERROR) << "Read error: " << error; | |
| 672 do_complete(HE_STREAM); | |
| 673 return; | |
| 674 } | |
| 675 } | |
| 676 } | |
| 677 | |
| 678 if (0 == len_) { | |
| 679 // No data currently available to send. | |
| 680 if (!data_->document) { | |
| 681 // If there is no source document, that means we're done. | |
| 682 do_complete(); | |
| 683 } | |
| 684 return; | |
| 685 } | |
| 686 | |
| 687 size_t written; | |
| 688 int error; | |
| 689 StreamResult result = http_stream_->Write(buffer_, len_, &written, &error); | |
| 690 if (result == SR_SUCCESS) { | |
| 691 RTC_DCHECK(written <= len_); | |
| 692 len_ -= written; | |
| 693 memmove(buffer_, buffer_ + written, len_); | |
| 694 send_required = false; | |
| 695 } else if (result == SR_BLOCK) { | |
| 696 if (send_required) { | |
| 697 // Nothing more we can do until network is writeable. | |
| 698 return; | |
| 699 } | |
| 700 } else { | |
| 701 RTC_DCHECK(result == SR_ERROR); | |
| 702 LOG_F(LS_ERROR) << "error"; | |
| 703 OnHttpStreamEvent(http_stream_, SE_CLOSE, error); | |
| 704 return; | |
| 705 } | |
| 706 } | |
| 707 | |
| 708 RTC_NOTREACHED(); | |
| 709 } | |
| 710 | |
| 711 bool | |
| 712 HttpBase::queue_headers() { | |
| 713 RTC_DCHECK(HM_SEND == mode_); | |
| 714 while (header_ != data_->end()) { | |
| 715 size_t len = sprintfn(buffer_ + len_, sizeof(buffer_) - len_, | |
| 716 "%.*s: %.*s\r\n", | |
| 717 header_->first.size(), header_->first.data(), | |
| 718 header_->second.size(), header_->second.data()); | |
| 719 if (len_ + len < sizeof(buffer_) - 3) { | |
| 720 len_ += len; | |
| 721 ++header_; | |
| 722 } else if (len_ == 0) { | |
| 723 LOG(WARNING) << "discarding header that is too long: " << header_->first; | |
| 724 ++header_; | |
| 725 } else { | |
| 726 // Not enough room for the next header, write to network first. | |
| 727 return true; | |
| 728 } | |
| 729 } | |
| 730 // End of headers | |
| 731 len_ += strcpyn(buffer_ + len_, sizeof(buffer_) - len_, "\r\n"); | |
| 732 return false; | |
| 733 } | |
| 734 | |
| 735 void | |
| 736 HttpBase::do_complete(HttpError err) { | |
| 737 RTC_DCHECK(mode_ != HM_NONE); | |
| 738 HttpMode mode = mode_; | |
| 739 mode_ = HM_NONE; | |
| 740 if (data_ && data_->document) { | |
| 741 data_->document->SignalEvent.disconnect(this); | |
| 742 } | |
| 743 data_ = nullptr; | |
| 744 if ((HM_RECV == mode) && doc_stream_) { | |
| 745 RTC_DCHECK(HE_NONE != | |
| 746 err); // We should have Disconnected doc_stream_ already. | |
| 747 DocumentStream* ds = doc_stream_; | |
| 748 ds->Disconnect(err); | |
| 749 ds->SignalEvent(ds, SE_CLOSE, err); | |
| 750 } | |
| 751 if (notify_) { | |
| 752 notify_->onHttpComplete(mode, err); | |
| 753 } | |
| 754 } | |
| 755 | |
| 756 // | |
| 757 // Stream Signals | |
| 758 // | |
| 759 | |
| 760 void | |
| 761 HttpBase::OnHttpStreamEvent(StreamInterface* stream, int events, int error) { | |
| 762 RTC_DCHECK(stream == http_stream_); | |
| 763 if ((events & SE_OPEN) && (mode_ == HM_CONNECT)) { | |
| 764 do_complete(); | |
| 765 return; | |
| 766 } | |
| 767 | |
| 768 if ((events & SE_WRITE) && (mode_ == HM_SEND)) { | |
| 769 flush_data(); | |
| 770 return; | |
| 771 } | |
| 772 | |
| 773 if ((events & SE_READ) && (mode_ == HM_RECV)) { | |
| 774 if (doc_stream_) { | |
| 775 doc_stream_->SignalEvent(doc_stream_, SE_READ, 0); | |
| 776 } else { | |
| 777 read_and_process_data(); | |
| 778 } | |
| 779 return; | |
| 780 } | |
| 781 | |
| 782 if ((events & SE_CLOSE) == 0) | |
| 783 return; | |
| 784 | |
| 785 HttpError http_error = HandleStreamClose(error); | |
| 786 if (mode_ == HM_RECV) { | |
| 787 complete(http_error); | |
| 788 } else if (mode_ != HM_NONE) { | |
| 789 do_complete(http_error); | |
| 790 } else if (notify_) { | |
| 791 notify_->onHttpClosed(http_error); | |
| 792 } | |
| 793 } | |
| 794 | |
| 795 void | |
| 796 HttpBase::OnDocumentEvent(StreamInterface* stream, int events, int error) { | |
| 797 RTC_DCHECK(stream == data_->document.get()); | |
| 798 if ((events & SE_WRITE) && (mode_ == HM_RECV)) { | |
| 799 read_and_process_data(); | |
| 800 return; | |
| 801 } | |
| 802 | |
| 803 if ((events & SE_READ) && (mode_ == HM_SEND)) { | |
| 804 flush_data(); | |
| 805 return; | |
| 806 } | |
| 807 | |
| 808 if (events & SE_CLOSE) { | |
| 809 LOG_F(LS_ERROR) << "Read error: " << error; | |
| 810 do_complete(HE_STREAM); | |
| 811 return; | |
| 812 } | |
| 813 } | |
| 814 | |
| 815 // | |
| 816 // HttpParser Implementation | |
| 817 // | |
| 818 | |
| 819 HttpParser::ProcessResult | |
| 820 HttpBase::ProcessLeader(const char* line, size_t len, HttpError* error) { | |
| 821 *error = data_->parseLeader(line, len); | |
| 822 return (HE_NONE == *error) ? PR_CONTINUE : PR_COMPLETE; | |
| 823 } | |
| 824 | |
| 825 HttpParser::ProcessResult | |
| 826 HttpBase::ProcessHeader(const char* name, size_t nlen, const char* value, | |
| 827 size_t vlen, HttpError* error) { | |
| 828 std::string sname(name, nlen), svalue(value, vlen); | |
| 829 data_->addHeader(sname, svalue); | |
| 830 return PR_CONTINUE; | |
| 831 } | |
| 832 | |
| 833 HttpParser::ProcessResult | |
| 834 HttpBase::ProcessHeaderComplete(bool chunked, size_t& data_size, | |
| 835 HttpError* error) { | |
| 836 StreamInterface* old_docstream = doc_stream_; | |
| 837 if (notify_) { | |
| 838 *error = notify_->onHttpHeaderComplete(chunked, data_size); | |
| 839 // The request must not be aborted as a result of this callback. | |
| 840 RTC_DCHECK(nullptr != data_); | |
| 841 } | |
| 842 if ((HE_NONE == *error) && data_->document) { | |
| 843 data_->document->SignalEvent.connect(this, &HttpBase::OnDocumentEvent); | |
| 844 } | |
| 845 if (HE_NONE != *error) { | |
| 846 return PR_COMPLETE; | |
| 847 } | |
| 848 if (old_docstream != doc_stream_) { | |
| 849 // Break out of Process loop, since our I/O model just changed. | |
| 850 return PR_BLOCK; | |
| 851 } | |
| 852 return PR_CONTINUE; | |
| 853 } | |
| 854 | |
| 855 HttpParser::ProcessResult | |
| 856 HttpBase::ProcessData(const char* data, size_t len, size_t& read, | |
| 857 HttpError* error) { | |
| 858 if (ignore_data_ || !data_->document) { | |
| 859 read = len; | |
| 860 return PR_CONTINUE; | |
| 861 } | |
| 862 int write_error = 0; | |
| 863 switch (data_->document->Write(data, len, &read, &write_error)) { | |
| 864 case SR_SUCCESS: | |
| 865 return PR_CONTINUE; | |
| 866 case SR_BLOCK: | |
| 867 return PR_BLOCK; | |
| 868 case SR_EOS: | |
| 869 LOG_F(LS_ERROR) << "Unexpected EOS"; | |
| 870 *error = HE_STREAM; | |
| 871 return PR_COMPLETE; | |
| 872 case SR_ERROR: | |
| 873 default: | |
| 874 LOG_F(LS_ERROR) << "Write error: " << write_error; | |
| 875 *error = HE_STREAM; | |
| 876 return PR_COMPLETE; | |
| 877 } | |
| 878 } | |
| 879 | |
| 880 void | |
| 881 HttpBase::OnComplete(HttpError err) { | |
| 882 LOG_F(LS_VERBOSE); | |
| 883 do_complete(err); | |
| 884 } | |
| 885 | |
| 886 } // namespace rtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2877023002:
Move webrtc/{base => rtc_base} (Closed)
