Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "shill/http_proxy.h" |
| 6 | |
| 7 | #include <errno.h> |
| 8 | #include <netinet/in.h> |
| 9 | #include <linux/if.h> // Needs definitions from netinet/in.h |
| 10 | #include <stdio.h> |
| 11 | #include <time.h> |
| 12 | |
| 13 | #include <string> |
| 14 | #include <vector> |
| 15 | |
| 16 | #include <base/logging.h> |
| 17 | #include <base/string_number_conversions.h> |
| 18 | #include <base/string_split.h> |
| 19 | #include <base/string_util.h> |
| 20 | #include <base/stringprintf.h> |
| 21 | |
| 22 | #include "shill/async_connection.h" |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 23 | #include "shill/connection.h" |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 24 | #include "shill/dns_client.h" |
| 25 | #include "shill/event_dispatcher.h" |
| 26 | #include "shill/ip_address.h" |
| 27 | #include "shill/sockets.h" |
| 28 | |
| 29 | using base::StringPrintf; |
| 30 | using std::string; |
| 31 | using std::vector; |
| 32 | |
| 33 | namespace shill { |
| 34 | |
| 35 | const int HTTPProxy::kClientHeaderTimeoutSeconds = 1; |
| 36 | const int HTTPProxy::kConnectTimeoutSeconds = 10; |
| 37 | const int HTTPProxy::kDNSTimeoutSeconds = 5; |
| 38 | const int HTTPProxy::kDefaultServerPort = 80; |
| 39 | const int HTTPProxy::kInputTimeoutSeconds = 30; |
| 40 | const size_t HTTPProxy::kMaxClientQueue = 10; |
| 41 | const size_t HTTPProxy::kMaxHeaderCount = 128; |
| 42 | const size_t HTTPProxy::kMaxHeaderSize = 2048; |
| 43 | const int HTTPProxy::kTransactionTimeoutSeconds = 600; |
| 44 | |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 45 | const char HTTPProxy::kHTTPMethodConnect[] = "connect"; |
| 46 | const char HTTPProxy::kHTTPMethodTerminator[] = " "; |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 47 | const char HTTPProxy::kHTTPURLDelimiters[] = " /#?"; |
| 48 | const char HTTPProxy::kHTTPURLPrefix[] = "http://"; |
| 49 | const char HTTPProxy::kHTTPVersionPrefix[] = " HTTP/1"; |
| 50 | const char HTTPProxy::kInternalErrorMsg[] = "Proxy Failed: Internal Error"; |
| 51 | |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 52 | HTTPProxy::HTTPProxy(ConnectionRefPtr connection) |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 53 | : state_(kStateIdle), |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 54 | connection_(connection), |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 55 | accept_callback_(NewCallback(this, &HTTPProxy::AcceptClient)), |
| 56 | connect_completion_callback_( |
| 57 | NewCallback(this, &HTTPProxy::OnConnectCompletion)), |
| 58 | dns_client_callback_(NewCallback(this, &HTTPProxy::GetDNSResult)), |
| 59 | read_client_callback_(NewCallback(this, &HTTPProxy::ReadFromClient)), |
| 60 | read_server_callback_(NewCallback(this, &HTTPProxy::ReadFromServer)), |
| 61 | write_client_callback_(NewCallback(this, &HTTPProxy::WriteToClient)), |
| 62 | write_server_callback_(NewCallback(this, &HTTPProxy::WriteToServer)), |
| 63 | task_factory_(this), |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 64 | dispatcher_(NULL), |
| 65 | dns_client_(NULL), |
| 66 | proxy_port_(-1), |
| 67 | proxy_socket_(-1), |
| 68 | server_async_connection_(NULL), |
| 69 | sockets_(NULL), |
| 70 | client_socket_(-1), |
| 71 | server_port_(kDefaultServerPort), |
| 72 | server_socket_(-1), |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 73 | is_route_requested_(false), |
| 74 | idle_timeout_(NULL) { } |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 75 | |
| 76 | HTTPProxy::~HTTPProxy() { |
| 77 | Stop(); |
| 78 | } |
| 79 | |
| 80 | bool HTTPProxy::Start(EventDispatcher *dispatcher, |
| 81 | Sockets *sockets) { |
| 82 | VLOG(3) << "In " << __func__; |
| 83 | |
| 84 | if (sockets_) { |
| 85 | // We are already running. |
| 86 | return true; |
| 87 | } |
| 88 | |
| 89 | proxy_socket_ = sockets->Socket(PF_INET, SOCK_STREAM, 0); |
| 90 | if (proxy_socket_ < 0) { |
| 91 | PLOG(ERROR) << "Failed to open proxy socket"; |
| 92 | return false; |
| 93 | } |
| 94 | |
| 95 | struct sockaddr_in addr; |
| 96 | socklen_t addrlen = sizeof(addr); |
| 97 | memset(&addr, 0, sizeof(addr)); |
| 98 | addr.sin_family = AF_INET; |
| 99 | addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK); |
| 100 | if (sockets->Bind(proxy_socket_, |
| 101 | reinterpret_cast<struct sockaddr *>(&addr), |
| 102 | sizeof(addr)) < 0 || |
| 103 | sockets->GetSockName(proxy_socket_, |
| 104 | reinterpret_cast<struct sockaddr *>(&addr), |
| 105 | &addrlen) < 0 || |
| 106 | sockets->SetNonBlocking(proxy_socket_) < 0 || |
| 107 | sockets->Listen(proxy_socket_, kMaxClientQueue) < 0) { |
| 108 | sockets->Close(proxy_socket_); |
| 109 | proxy_socket_ = -1; |
| 110 | PLOG(ERROR) << "HTTPProxy socket setup failed"; |
| 111 | return false; |
| 112 | } |
| 113 | |
| 114 | accept_handler_.reset( |
| 115 | dispatcher->CreateReadyHandler(proxy_socket_, IOHandler::kModeInput, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 116 | accept_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 117 | dispatcher_ = dispatcher; |
| 118 | dns_client_.reset(new DNSClient(IPAddress::kFamilyIPv4, |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 119 | connection_->interface_name(), |
| 120 | connection_->dns_servers(), |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 121 | kDNSTimeoutSeconds * 1000, |
| 122 | dispatcher, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 123 | dns_client_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 124 | proxy_port_ = ntohs(addr.sin_port); |
| 125 | server_async_connection_.reset( |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 126 | new AsyncConnection(connection_->interface_name(), dispatcher, sockets, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 127 | connect_completion_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 128 | sockets_ = sockets; |
| 129 | state_ = kStateWaitConnection; |
| 130 | return true; |
| 131 | } |
| 132 | |
| 133 | void HTTPProxy::Stop() { |
| 134 | VLOG(3) << "In " << __func__; |
| 135 | |
| 136 | if (!sockets_ ) { |
| 137 | return; |
| 138 | } |
| 139 | |
| 140 | StopClient(); |
| 141 | |
| 142 | accept_handler_.reset(); |
| 143 | dispatcher_ = NULL; |
| 144 | dns_client_.reset(); |
| 145 | proxy_port_ = -1; |
| 146 | server_async_connection_.reset(); |
| 147 | sockets_->Close(proxy_socket_); |
| 148 | proxy_socket_ = -1; |
| 149 | sockets_ = NULL; |
| 150 | state_ = kStateIdle; |
| 151 | } |
| 152 | |
| 153 | // IOReadyHandler callback routine fired when a client connects to the |
| 154 | // proxy's socket. We Accept() the client and start reading a request |
| 155 | // from it. |
| 156 | void HTTPProxy::AcceptClient(int fd) { |
| 157 | VLOG(3) << "In " << __func__; |
| 158 | |
| 159 | int client_fd = sockets_->Accept(fd, NULL, NULL); |
| 160 | if (client_fd < 0) { |
| 161 | PLOG(ERROR) << "Client accept failed"; |
| 162 | return; |
| 163 | } |
| 164 | |
| 165 | accept_handler_->Stop(); |
| 166 | |
| 167 | client_socket_ = client_fd; |
| 168 | |
| 169 | sockets_->SetNonBlocking(client_socket_); |
| 170 | read_client_handler_.reset( |
| 171 | dispatcher_->CreateInputHandler(client_socket_, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 172 | read_client_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 173 | // Overall transaction timeout. |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 174 | dispatcher_->PostDelayedTask( |
| 175 | task_factory_.NewRunnableMethod(&HTTPProxy::StopClient), |
| 176 | kTransactionTimeoutSeconds * 1000); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 177 | |
| 178 | state_ = kStateReadClientHeader; |
| 179 | StartIdleTimeout(); |
| 180 | } |
| 181 | |
| 182 | bool HTTPProxy::ConnectServer(const IPAddress &address, int port) { |
| 183 | state_ = kStateConnectServer; |
| 184 | if (!server_async_connection_->Start(address, port)) { |
| 185 | SendClientError(500, "Could not create socket to connect to server"); |
| 186 | return false; |
| 187 | } |
| 188 | StartIdleTimeout(); |
| 189 | return true; |
| 190 | } |
| 191 | |
| 192 | // DNSClient callback that fires when the DNS request completes. |
Paul Stewart | bdb02e6 | 2012-02-22 16:24:33 -0800 | [diff] [blame] | 193 | void HTTPProxy::GetDNSResult(const Error &error, const IPAddress &address) { |
| 194 | if (!error.IsSuccess()) { |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 195 | SendClientError(502, string("Could not resolve hostname: ") + |
Paul Stewart | bdb02e6 | 2012-02-22 16:24:33 -0800 | [diff] [blame] | 196 | error.message()); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 197 | return; |
| 198 | } |
Paul Stewart | bdb02e6 | 2012-02-22 16:24:33 -0800 | [diff] [blame] | 199 | ConnectServer(address, server_port_); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 200 | } |
| 201 | |
| 202 | // IOReadyHandler callback routine which fires when the asynchronous Connect() |
| 203 | // to the remote server completes (or fails). |
| 204 | void HTTPProxy::OnConnectCompletion(bool success, int fd) { |
| 205 | if (!success) { |
| 206 | SendClientError(500, string("Socket connection delayed failure: ") + |
| 207 | server_async_connection_->error()); |
| 208 | return; |
| 209 | } |
| 210 | server_socket_ = fd; |
| 211 | state_ = kStateTunnelData; |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 212 | |
| 213 | // If this was a "CONNECT" request, notify the client that the connection |
| 214 | // has been established by sending an "OK" response. |
| 215 | if (LowerCaseEqualsASCII(client_method_, kHTTPMethodConnect)) { |
| 216 | SetClientResponse(200, "OK", "", ""); |
| 217 | StartReceive(); |
| 218 | } |
| 219 | |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 220 | StartTransmit(); |
| 221 | } |
| 222 | |
| 223 | // Read through the header lines from the client, modifying or adding |
| 224 | // lines as necessary. Perform final determination of the hostname/port |
| 225 | // we should connect to and either start a DNS request or connect to a |
| 226 | // numeric address. |
| 227 | bool HTTPProxy::ParseClientRequest() { |
| 228 | VLOG(3) << "In " << __func__; |
| 229 | |
| 230 | string host; |
| 231 | bool found_via = false; |
| 232 | bool found_connection = false; |
| 233 | for (vector<string>::iterator it = client_headers_.begin(); |
| 234 | it != client_headers_.end(); ++it) { |
| 235 | if (StartsWithASCII(*it, "Host:", false)) { |
| 236 | host = it->substr(5); |
| 237 | } else if (StartsWithASCII(*it, "Via:", false)) { |
| 238 | found_via = true; |
| 239 | (*it).append(StringPrintf(", %s shill-proxy", client_version_.c_str())); |
| 240 | } else if (StartsWithASCII(*it, "Connection:", false)) { |
| 241 | found_connection = true; |
| 242 | (*it).assign("Connection: close"); |
| 243 | } else if (StartsWithASCII(*it, "Proxy-Connection:", false)) { |
| 244 | (*it).assign("Proxy-Connection: close"); |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | if (!found_connection) { |
| 249 | client_headers_.push_back("Connection: close"); |
| 250 | } |
| 251 | if (!found_via) { |
| 252 | client_headers_.push_back( |
| 253 | StringPrintf("Via: %s shill-proxy", client_version_.c_str())); |
| 254 | } |
| 255 | |
| 256 | // Assemble the request as it will be sent to the server. |
| 257 | client_data_.Clear(); |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 258 | if (!LowerCaseEqualsASCII(client_method_, kHTTPMethodConnect)) { |
| 259 | for (vector<string>::iterator it = client_headers_.begin(); |
| 260 | it != client_headers_.end(); ++it) { |
| 261 | client_data_.Append(ByteString(*it + "\r\n", false)); |
| 262 | } |
| 263 | client_data_.Append(ByteString(string("\r\n"), false)); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 264 | } |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 265 | |
| 266 | TrimWhitespaceASCII(host, TRIM_ALL, &host); |
| 267 | if (host.empty()) { |
| 268 | // Revert to using the hostname in the URL if no "Host:" header exists. |
| 269 | host = server_hostname_; |
| 270 | } |
| 271 | |
| 272 | if (host.empty()) { |
| 273 | SendClientError(400, "I don't know what host you want me to connect to"); |
| 274 | return false; |
| 275 | } |
| 276 | |
| 277 | server_port_ = 80; |
| 278 | vector<string> host_parts; |
| 279 | base::SplitString(host, ':', &host_parts); |
| 280 | |
| 281 | if (host_parts.size() > 2) { |
| 282 | SendClientError(400, "Too many colons in hostname"); |
| 283 | return false; |
| 284 | } else if (host_parts.size() == 2) { |
| 285 | server_hostname_ = host_parts[0]; |
| 286 | if (!base::StringToInt(host_parts[1], &server_port_)) { |
| 287 | SendClientError(400, "Could not parse port number"); |
| 288 | return false; |
| 289 | } |
| 290 | } else { |
| 291 | server_hostname_ = host; |
| 292 | } |
| 293 | |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 294 | connection_->RequestRouting(); |
| 295 | is_route_requested_ = true; |
| 296 | |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 297 | IPAddress addr(IPAddress::kFamilyIPv4); |
| 298 | if (addr.SetAddressFromString(server_hostname_)) { |
| 299 | if (!ConnectServer(addr, server_port_)) { |
| 300 | return false; |
| 301 | } |
| 302 | } else { |
| 303 | VLOG(3) << "Looking up host: " << server_hostname_; |
Paul Stewart | bdb02e6 | 2012-02-22 16:24:33 -0800 | [diff] [blame] | 304 | Error error; |
| 305 | if (!dns_client_->Start(server_hostname_, &error)) { |
| 306 | SendClientError(502, "Could not resolve hostname: " + error.message()); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 307 | return false; |
| 308 | } |
| 309 | state_ = kStateLookupServer; |
| 310 | } |
| 311 | return true; |
| 312 | } |
| 313 | |
| 314 | // Accept a new line into the client headers. Returns false if a parse |
| 315 | // error occurs. |
| 316 | bool HTTPProxy::ProcessLastHeaderLine() { |
| 317 | string *header = &client_headers_.back(); |
| 318 | TrimString(*header, "\r", header); |
| 319 | |
| 320 | if (header->empty()) { |
| 321 | // Empty line terminates client headers. |
| 322 | client_headers_.pop_back(); |
| 323 | if (!ParseClientRequest()) { |
| 324 | return false; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | // Is this is the first header line? |
| 329 | if (client_headers_.size() == 1) { |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 330 | if (!ReadClientHTTPMethod(header) || |
| 331 | !ReadClientHTTPVersion(header) || |
| 332 | !ReadClientHostname(header)) { |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 333 | return false; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | if (client_headers_.size() >= kMaxHeaderCount) { |
| 338 | SendClientError(500, kInternalErrorMsg); |
| 339 | return false; |
| 340 | } |
| 341 | |
| 342 | return true; |
| 343 | } |
| 344 | |
| 345 | // Split input from client into header lines, and consume parsed lines |
| 346 | // from InputData. The passed in |data| is modified to indicate the |
| 347 | // characters consumed. |
| 348 | bool HTTPProxy::ReadClientHeaders(InputData *data) { |
| 349 | unsigned char *ptr = data->buf; |
| 350 | unsigned char *end = ptr + data->len; |
| 351 | |
| 352 | if (client_headers_.empty()) { |
| 353 | client_headers_.push_back(string()); |
| 354 | } |
| 355 | |
| 356 | for (; ptr < end && state_ == kStateReadClientHeader; ++ptr) { |
| 357 | if (*ptr == '\n') { |
| 358 | if (!ProcessLastHeaderLine()) { |
| 359 | return false; |
| 360 | } |
| 361 | |
| 362 | // Start a new line. New chararacters we receive will be appended there. |
| 363 | client_headers_.push_back(string()); |
| 364 | continue; |
| 365 | } |
| 366 | |
| 367 | string *header = &client_headers_.back(); |
| 368 | // Is the first character of the header line a space or tab character? |
| 369 | if (header->empty() && (*ptr == ' ' || *ptr == '\t') && |
| 370 | client_headers_.size() > 1) { |
| 371 | // Line Continuation: Add this character to the previous header line. |
| 372 | // This way, all of the data (including newlines and line continuation |
| 373 | // characters) related to a specific header will be contained within |
| 374 | // a single element of |client_headers_|, and manipulation of headers |
| 375 | // such as appending will be simpler. This is accomplished by removing |
| 376 | // the empty line we started, and instead appending the whitespace |
| 377 | // and following characters to the previous line. |
| 378 | client_headers_.pop_back(); |
| 379 | header = &client_headers_.back(); |
| 380 | header->append("\r\n"); |
| 381 | } |
| 382 | |
| 383 | if (header->length() >= kMaxHeaderSize) { |
| 384 | SendClientError(500, kInternalErrorMsg); |
| 385 | return false; |
| 386 | } |
| 387 | header->push_back(*ptr); |
| 388 | } |
| 389 | |
| 390 | // Return the remaining data to the caller -- this could be POST data |
| 391 | // or other non-header data sent with the client request. |
| 392 | data->buf = ptr; |
| 393 | data->len = end - ptr; |
| 394 | |
| 395 | return true; |
| 396 | } |
| 397 | |
| 398 | // Finds the URL in the first line of an HTTP client header, and extracts |
| 399 | // and removes the hostname (and port) from the URL. Returns false if a |
| 400 | // parse error occurs, and true otherwise (whether or not the hostname was |
| 401 | // found). |
| 402 | bool HTTPProxy::ReadClientHostname(string *header) { |
| 403 | const string http_url_prefix(kHTTPURLPrefix); |
| 404 | size_t url_idx = header->find(http_url_prefix); |
| 405 | if (url_idx != string::npos) { |
| 406 | size_t host_start = url_idx + http_url_prefix.length(); |
| 407 | size_t host_end = |
| 408 | header->find_first_of(kHTTPURLDelimiters, host_start); |
| 409 | if (host_end != string::npos) { |
| 410 | server_hostname_ = header->substr(host_start, |
| 411 | host_end - host_start); |
| 412 | // Modify the URL passed upstream to remove "http://<hostname>". |
| 413 | header->erase(url_idx, host_end - url_idx); |
| 414 | if ((*header)[url_idx] != '/') { |
| 415 | header->insert(url_idx, "/"); |
| 416 | } |
| 417 | } else { |
| 418 | LOG(ERROR) << "Could not find end of hostname in request. Line was: " |
| 419 | << *header; |
| 420 | SendClientError(500, kInternalErrorMsg); |
| 421 | return false; |
| 422 | } |
| 423 | } |
| 424 | return true; |
| 425 | } |
| 426 | |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 427 | bool HTTPProxy::ReadClientHTTPMethod(string *header) { |
| 428 | size_t method_end = header->find(kHTTPMethodTerminator); |
| 429 | if (method_end == string::npos || method_end == 0) { |
| 430 | LOG(ERROR) << "Could not parse HTTP method. Line was: " << *header; |
| 431 | SendClientError(501, "Server could not parse HTTP method"); |
| 432 | return false; |
| 433 | } |
| 434 | client_method_ = header->substr(0, method_end); |
| 435 | return true; |
| 436 | } |
| 437 | |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 438 | // Extract the HTTP version number from the first line of the client headers. |
| 439 | // Returns true if found. |
| 440 | bool HTTPProxy::ReadClientHTTPVersion(string *header) { |
| 441 | const string http_version_prefix(kHTTPVersionPrefix); |
| 442 | size_t http_ver_pos = header->find(http_version_prefix); |
| 443 | if (http_ver_pos != string::npos) { |
| 444 | client_version_ = |
| 445 | header->substr(http_ver_pos + http_version_prefix.length() - 1); |
| 446 | } else { |
| 447 | SendClientError(501, "Server only accepts HTTP/1.x requests"); |
| 448 | return false; |
| 449 | } |
| 450 | return true; |
| 451 | } |
| 452 | |
| 453 | // IOInputHandler callback that fires when data is read from the client. |
| 454 | // This could be header data, or perhaps POST data that follows the headers. |
| 455 | void HTTPProxy::ReadFromClient(InputData *data) { |
| 456 | VLOG(3) << "In " << __func__ << " length " << data->len; |
| 457 | |
| 458 | if (data->len == 0) { |
| 459 | // EOF from client. |
| 460 | StopClient(); |
| 461 | return; |
| 462 | } |
| 463 | |
| 464 | if (state_ == kStateReadClientHeader) { |
| 465 | if (!ReadClientHeaders(data)) { |
| 466 | return; |
| 467 | } |
| 468 | if (state_ == kStateReadClientHeader) { |
| 469 | // Still consuming client headers; restart the input timer. |
| 470 | StartIdleTimeout(); |
| 471 | return; |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | // Check data->len again since ReadClientHeaders() may have consumed some |
| 476 | // part of it. |
| 477 | if (data->len != 0) { |
| 478 | // The client sent some information after its headers. Buffer the client |
| 479 | // input and temporarily disable input events from the client. |
| 480 | client_data_.Append(ByteString(data->buf, data->len)); |
| 481 | read_client_handler_->Stop(); |
| 482 | StartTransmit(); |
| 483 | } |
| 484 | } |
| 485 | |
| 486 | // IOInputHandler callback which fires when data has been read from the |
| 487 | // server. |
| 488 | void HTTPProxy::ReadFromServer(InputData *data) { |
| 489 | VLOG(3) << "In " << __func__ << " length " << data->len; |
| 490 | if (data->len == 0) { |
| 491 | // Server closed connection. |
| 492 | if (server_data_.IsEmpty()) { |
| 493 | StopClient(); |
| 494 | return; |
| 495 | } |
| 496 | state_ = kStateFlushResponse; |
| 497 | } else { |
| 498 | read_server_handler_->Stop(); |
| 499 | } |
| 500 | |
| 501 | server_data_.Append(ByteString(data->buf, data->len)); |
| 502 | |
| 503 | StartTransmit(); |
| 504 | } |
| 505 | |
| 506 | // Return an HTTP error message back to the client. |
| 507 | void HTTPProxy::SendClientError(int code, const string &error) { |
| 508 | VLOG(3) << "In " << __func__; |
| 509 | LOG(ERROR) << "Sending error " << error; |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 510 | SetClientResponse(code, "ERROR", "text/plain", error); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 511 | state_ = kStateFlushResponse; |
| 512 | StartTransmit(); |
| 513 | } |
| 514 | |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 515 | // Create an HTTP response message to be sent to the client. |
| 516 | void HTTPProxy::SetClientResponse(int code, const string &type, |
| 517 | const string &content_type, |
| 518 | const string &message) { |
| 519 | string content_line; |
| 520 | if (!message.empty() && !content_type.empty()) { |
| 521 | content_line = StringPrintf("Content-Type: %s\r\n", content_type.c_str()); |
| 522 | } |
| 523 | string response = StringPrintf("HTTP/1.1 %d %s\r\n" |
| 524 | "%s\r\n" |
| 525 | "%s", code, type.c_str(), |
| 526 | content_line.c_str(), |
| 527 | message.c_str()); |
| 528 | server_data_ = ByteString(response, false); |
| 529 | } |
| 530 | |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 531 | // Start a timeout for "the next event". This timeout augments the overall |
| 532 | // transaction timeout to make sure there is some activity occurring at |
| 533 | // reasonable intervals. |
| 534 | void HTTPProxy::StartIdleTimeout() { |
| 535 | int timeout_seconds = 0; |
| 536 | switch (state_) { |
| 537 | case kStateReadClientHeader: |
| 538 | timeout_seconds = kClientHeaderTimeoutSeconds; |
| 539 | break; |
| 540 | case kStateConnectServer: |
| 541 | timeout_seconds = kConnectTimeoutSeconds; |
| 542 | break; |
| 543 | case kStateLookupServer: |
| 544 | // DNSClient has its own internal timeout, so we need not set one here. |
| 545 | timeout_seconds = 0; |
| 546 | break; |
| 547 | default: |
| 548 | timeout_seconds = kInputTimeoutSeconds; |
| 549 | break; |
| 550 | } |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 551 | if (idle_timeout_) { |
| 552 | idle_timeout_->Cancel(); |
| 553 | idle_timeout_ = NULL; |
| 554 | } |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 555 | if (timeout_seconds != 0) { |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 556 | idle_timeout_ = task_factory_.NewRunnableMethod(&HTTPProxy::StopClient); |
| 557 | dispatcher_->PostDelayedTask(idle_timeout_, timeout_seconds * 1000); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 558 | } |
| 559 | } |
| 560 | |
| 561 | // Start the various input handlers. Listen for new data only if we have |
| 562 | // completely written the last data we've received to the other end. |
| 563 | void HTTPProxy::StartReceive() { |
| 564 | if (state_ == kStateTunnelData && client_data_.IsEmpty()) { |
| 565 | read_client_handler_->Start(); |
| 566 | } |
| 567 | if (server_data_.IsEmpty()) { |
| 568 | if (state_ == kStateTunnelData) { |
| 569 | if (read_server_handler_.get()) { |
| 570 | read_server_handler_->Start(); |
| 571 | } else { |
| 572 | read_server_handler_.reset( |
| 573 | dispatcher_->CreateInputHandler(server_socket_, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 574 | read_server_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 575 | } |
| 576 | } else if (state_ == kStateFlushResponse) { |
| 577 | StopClient(); |
| 578 | return; |
| 579 | } |
| 580 | } |
| 581 | StartIdleTimeout(); |
| 582 | } |
| 583 | |
| 584 | // Start the various output-ready handlers for the endpoints we have |
| 585 | // data waiting for. |
| 586 | void HTTPProxy::StartTransmit() { |
| 587 | if (state_ == kStateTunnelData && !client_data_.IsEmpty()) { |
| 588 | if (write_server_handler_.get()) { |
| 589 | write_server_handler_->Start(); |
| 590 | } else { |
| 591 | write_server_handler_.reset( |
| 592 | dispatcher_->CreateReadyHandler(server_socket_, |
| 593 | IOHandler::kModeOutput, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 594 | write_server_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 595 | } |
| 596 | } |
| 597 | if ((state_ == kStateFlushResponse || state_ == kStateTunnelData) && |
| 598 | !server_data_.IsEmpty()) { |
| 599 | if (write_client_handler_.get()) { |
| 600 | write_client_handler_->Start(); |
| 601 | } else { |
| 602 | write_client_handler_.reset( |
| 603 | dispatcher_->CreateReadyHandler(client_socket_, |
| 604 | IOHandler::kModeOutput, |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 605 | write_client_callback_.get())); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 606 | } |
| 607 | } |
| 608 | StartIdleTimeout(); |
| 609 | } |
| 610 | |
| 611 | // End the transaction with the current client, restart the IOHandler |
| 612 | // which alerts us to new clients connecting. This function is called |
| 613 | // during various error conditions and is a callback for all timeouts. |
| 614 | void HTTPProxy::StopClient() { |
| 615 | VLOG(3) << "In " << __func__; |
| 616 | |
Paul Stewart | c8f4bef | 2011-12-13 09:45:51 -0800 | [diff] [blame] | 617 | if (is_route_requested_) { |
| 618 | connection_->ReleaseRouting(); |
| 619 | is_route_requested_ = false; |
| 620 | } |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 621 | write_client_handler_.reset(); |
| 622 | read_client_handler_.reset(); |
| 623 | if (client_socket_ != -1) { |
| 624 | sockets_->Close(client_socket_); |
| 625 | client_socket_ = -1; |
| 626 | } |
| 627 | client_headers_.clear(); |
Paul Stewart | 58a577b | 2012-01-10 11:18:52 -0800 | [diff] [blame] | 628 | client_method_.clear(); |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 629 | client_version_.clear(); |
| 630 | server_port_ = kDefaultServerPort; |
| 631 | write_server_handler_.reset(); |
| 632 | read_server_handler_.reset(); |
| 633 | if (server_socket_ != -1) { |
| 634 | sockets_->Close(server_socket_); |
| 635 | server_socket_ = -1; |
| 636 | } |
| 637 | server_hostname_.clear(); |
| 638 | client_data_.Clear(); |
| 639 | server_data_.Clear(); |
| 640 | dns_client_->Stop(); |
| 641 | server_async_connection_->Stop(); |
Eric Shienbrood | b5c8940 | 2012-03-13 08:29:25 -0700 | [diff] [blame] | 642 | task_factory_.RevokeAll(); |
| 643 | idle_timeout_ = NULL; |
Paul Stewart | f65320c | 2011-10-13 14:34:52 -0700 | [diff] [blame] | 644 | accept_handler_->Start(); |
| 645 | state_ = kStateWaitConnection; |
| 646 | } |
| 647 | |
| 648 | // Output ReadyHandler callback which fires when the client socket is |
| 649 | // ready for data to be sent to it. |
| 650 | void HTTPProxy::WriteToClient(int fd) { |
| 651 | CHECK_EQ(client_socket_, fd); |
| 652 | int ret = sockets_->Send(fd, server_data_.GetConstData(), |
| 653 | server_data_.GetLength(), 0); |
| 654 | VLOG(3) << "In " << __func__ << " wrote " << ret << " of " << |
| 655 | server_data_.GetLength(); |
| 656 | if (ret < 0) { |
| 657 | LOG(ERROR) << "Server write failed"; |
| 658 | StopClient(); |
| 659 | return; |
| 660 | } |
| 661 | |
| 662 | server_data_ = ByteString(server_data_.GetConstData() + ret, |
| 663 | server_data_.GetLength() - ret); |
| 664 | |
| 665 | if (server_data_.IsEmpty()) { |
| 666 | write_client_handler_->Stop(); |
| 667 | } |
| 668 | |
| 669 | StartReceive(); |
| 670 | } |
| 671 | |
| 672 | // Output ReadyHandler callback which fires when the server socket is |
| 673 | // ready for data to be sent to it. |
| 674 | void HTTPProxy::WriteToServer(int fd) { |
| 675 | CHECK_EQ(server_socket_, fd); |
| 676 | int ret = sockets_->Send(fd, client_data_.GetConstData(), |
| 677 | client_data_.GetLength(), 0); |
| 678 | VLOG(3) << "In " << __func__ << " wrote " << ret << " of " << |
| 679 | client_data_.GetLength(); |
| 680 | |
| 681 | if (ret < 0) { |
| 682 | LOG(ERROR) << "Client write failed"; |
| 683 | StopClient(); |
| 684 | return; |
| 685 | } |
| 686 | |
| 687 | client_data_ = ByteString(client_data_.GetConstData() + ret, |
| 688 | client_data_.GetLength() - ret); |
| 689 | |
| 690 | if (client_data_.IsEmpty()) { |
| 691 | write_server_handler_->Stop(); |
| 692 | } |
| 693 | |
| 694 | StartReceive(); |
| 695 | } |
| 696 | |
| 697 | } // namespace shill |