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net/server/web_socket.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/server/web_socket.h"
+
+#include "base/base64.h"
+#include "base/rand_util.h"
+#include "base/logging.h"
+#include "base/md5.h"
+#include "base/sha1.h"
+#include "base/string_number_conversions.h"
+#include "base/stringprintf.h"
+#include "net/server/http_connection.h"
+#include "net/server/http_server_request_info.h"
+
+#if defined(OS_WIN)
+#include <winsock2.h>
+#else
+#include <arpa/inet.h>
+#endif
+
+#include <limits>
+
+namespace net {
+
+namespace {
+
+static uint32 WebSocketKeyFingerprint(const std::string& str) {

[yurys, 2011/08/01 13:42:29]

Consider splitting this class into two files with Hixies76 and Hybi10
implementations.

+  std::string result;
+  const char* pChar = str.c_str();
+  int length = str.length();
+  int spaces = 0;
+  for (int i = 0; i < length; ++i) {
+    if (pChar[i] >= '0' && pChar[i] <= '9')
+      result.append(&pChar[i], 1);
+    else if (pChar[i] == ' ')
+      spaces++;
+  }
+  if (spaces == 0)
+    return 0;
+  int64 number = 0;
+  if (!base::StringToInt64(result, &number))
+    return 0;
+  return htonl(static_cast<uint32>(number / spaces));
+}
+
+class WebSocketHixie76 : public net::WebSocket {
+ public:
+  static net::WebSocket* Create(HttpConnection* connection,
+                                const HttpServerRequestInfo& request,
+                                size_t* pos) {
+    if (connection->recv_data().length() < *pos + kWebSocketHandshakeBodyLen)
+      return NULL;
+    return new WebSocketHixie76(connection, request, pos);
+  }
+
+  virtual void Accept(const HttpServerRequestInfo& request) {
+    std::string key1 = request.GetHeaderValue("Sec-WebSocket-Key1");
+    std::string key2 = request.GetHeaderValue("Sec-WebSocket-Key2");
+
+    uint32 fp1 = WebSocketKeyFingerprint(key1);
+    uint32 fp2 = WebSocketKeyFingerprint(key2);
+
+    char data[16];
+    memcpy(data, &fp1, 4);
+    memcpy(data + 4, &fp2, 4);
+    memcpy(data + 8, &key3_[0], 8);
+
+    base::MD5Digest digest;
+    base::MD5Sum(data, 16, &digest);
+
+    std::string origin = request.GetHeaderValue("Origin");
+    std::string host = request.GetHeaderValue("Host");
+    std::string location = "ws://" + host + request.path;
+    connection_->Send(base::StringPrintf(
+        "HTTP/1.1 101 WebSocket Protocol Handshake\r\n"
+        "Upgrade: WebSocket\r\n"
+        "Connection: Upgrade\r\n"
+        "Sec-WebSocket-Origin: %s\r\n"
+        "Sec-WebSocket-Location: %s\r\n"
+        "\r\n",
+        origin.c_str(),
+        location.c_str()));
+    connection_->Send(reinterpret_cast<char*>(digest.a), 16);
+  }
+
+  virtual ParseResult Read(std::string* message) {
+    DCHECK(message);
+    const std::string& data = connection_->recv_data();
+    if (data[0])
+      return FRAME_ERROR;
+
+    size_t pos = data.find('\377', 1);
+    if (pos == std::string::npos)
+      return FRAME_INCOMPLETE;
+
+    std::string buffer(data.begin() + 1, data.begin() + pos);
+    message->swap(buffer);
+    connection_->Shift(pos + 1);
+
+    return FRAME_OK;
+  }
+
+  virtual void Send(const std::string& message) {
+    char message_start = 0;
+    char message_end = -1;
+    connection_->Send(&message_start, 1);
+    connection_->Send(message);
+    connection_->Send(&message_end, 1);
+  }
+
+ private:
+  static const int kWebSocketHandshakeBodyLen;
+
+  WebSocketHixie76(HttpConnection* connection,
+                   const HttpServerRequestInfo& request,
+                   size_t* pos) : WebSocket(connection) {
+    std::string key1 = request.GetHeaderValue("Sec-WebSocket-Key1");
+    std::string key2 = request.GetHeaderValue("Sec-WebSocket-Key2");
+
+    if (key1.empty()) {
+      connection->Send500("Invalid request format. "
+                          "Sec-WebSocket-Key1 is empty or isn't specified.");
+      return;
+    }
+
+    if (key2.empty()) {
+      connection->Send500("Invalid request format. "
+                          "Sec-WebSocket-Key2 is empty or isn't specified.");
+      return;
+    }
+
+    key3_ = connection->recv_data().substr(
+        *pos,
+        *pos + kWebSocketHandshakeBodyLen);
+    *pos += kWebSocketHandshakeBodyLen;
+  }
+
+  std::string key3_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketHixie76);
+};
+
+const int WebSocketHixie76::kWebSocketHandshakeBodyLen = 8;
+
+
+// Constants for hybi-10 frame format.
+
+typedef int OpCode;
+
+const OpCode kOpCodeContinuation = 0x0;
+const OpCode kOpCodeText = 0x1;
+const OpCode kOpCodeBinary = 0x2;
+const OpCode kOpCodeClose = 0x8;
+const OpCode kOpCodePing = 0x9;
+const OpCode kOpCodePong = 0xA;
+
+const unsigned char kFinalBit = 0x80;
+const unsigned char kReserved1Bit = 0x40;
+const unsigned char kReserved2Bit = 0x20;
+const unsigned char kReserved3Bit = 0x10;
+const unsigned char kOpCodeMask = 0xF;
+const unsigned char kMaskBit = 0x80;
+const unsigned char kPayloadLengthMask = 0x7F;
+
+const size_t kMaxSingleBytePayloadLength = 125;
+const size_t kTwoBytePayloadLengthField = 126;
+const size_t kEightBytePayloadLengthField = 127;
+const size_t kMaskingKeyWidthInBytes = 4;
+
+class WebSocketHybi10 : public WebSocket {
+ public:
+  static WebSocket* Create(HttpConnection* connection,
+                           const HttpServerRequestInfo& request,
+                           size_t* pos) {
+    std::string version = request.GetHeaderValue("Sec-WebSocket-Version");
+    if (version != "8")
+      return NULL;
+
+    std::string key = request.GetHeaderValue("Sec-WebSocket-Key");
+    if (key.empty()) {
+      connection->Send500("Invalid request format. "
+              "Sec-WebSocket-Key is empty or isn't specified.");
+      return NULL;
+    }
+    return new WebSocketHybi10(connection, request, pos);
+  }
+
+  virtual void Accept(const HttpServerRequestInfo& request) {
+    static const char* const web_socket_GUID =
+        "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
+    std::string key = request.GetHeaderValue("Sec-WebSocket-Key");
+    std::string data = base::StringPrintf("%s%s", key.c_str(), web_socket_GUID);
+    std::string encoded_hash;
+    base::Base64Encode(base::SHA1HashString(data), &encoded_hash);
+
+    std::string response = base::StringPrintf(
+        "HTTP/1.1 101 WebSocket Protocol Handshake\r\n"
+        "Upgrade: WebSocket\r\n"
+        "Connection: Upgrade\r\n"
+        "Sec-WebSocket-Accept: %s\r\n"
+        "\r\n",
+        encoded_hash.c_str());
+    connection_->Send(response);
+  }
+
+  virtual ParseResult Read(std::string* message) {
+    size_t data_length = connection_->recv_data().length();
+    if (data_length < 2)
+      return FRAME_INCOMPLETE;
+
+    const char* p = connection_->recv_data().c_str();
+    const char* buffer_end = p + data_length;
+
+    unsigned char first_byte = *p++;
+    unsigned char second_byte = *p++;
+
+    final_ = first_byte & kFinalBit;
+    reserved1_ = first_byte & kReserved1Bit;
+    reserved2_ = first_byte & kReserved2Bit;
+    reserved3_ = first_byte & kReserved3Bit;
+    op_code_ = first_byte & kOpCodeMask;
+    masked_ = second_byte & kMaskBit;
+
+    CHECK(op_code_ == kOpCodeText);
+
+    uint64 payload_length64 = second_byte & kPayloadLengthMask;
+    if (payload_length64 > kMaxSingleBytePayloadLength) {
+      int extended_payload_length_size;
+      if (payload_length64 == kTwoBytePayloadLengthField)
+        extended_payload_length_size = 2;
+      else {
+        DCHECK(payload_length64 == kEightBytePayloadLengthField);
+        extended_payload_length_size = 8;
+      }
+      if (buffer_end - p < extended_payload_length_size)
+        return FRAME_INCOMPLETE;
+      payload_length64 = 0;
+      for (int i = 0; i < extended_payload_length_size; ++i) {
+        payload_length64 <<= 8;
+        payload_length64 |= static_cast<unsigned char>(*p++);
+      }
+    }
+
+    static const uint64 max_payload_ength = 0x7FFFFFFFFFFFFFFFull;

[yurys, 2011/08/01 13:51:09]

max_payload_ength -> max_payload_length

+    size_t masking_key_length = masked_ ? kMaskingKeyWidthInBytes : 0;
+    static size_t max_length = std::numeric_limits<size_t>::max();
+    if (payload_length64 > max_payload_ength ||
+        payload_length64 + masking_key_length > max_length) {
+      // WebSocket frame length too large.
+      return FRAME_ERROR;
+    }
+    payload_length_ = static_cast<size_t>(payload_length64);
+
+    size_t total_length = masking_key_length + payload_length_;
+    if (static_cast<size_t>(buffer_end - p) < total_length)
+      return FRAME_INCOMPLETE;
+
+    if (masked_) {
+      message->resize(payload_length_);
+      const char* masking_key = p;
+      char* payload = const_cast<char*>(p + kMaskingKeyWidthInBytes);
+      for (size_t i = 0; i < payload_length_; ++i) // Unmask the payload.
+        (*message)[i] = payload[i] ^ masking_key[i % kMaskingKeyWidthInBytes];
+    } else {
+      std::string buffer(p, p + payload_length_);
+      message->swap(buffer);
+    }
+
+    size_t pos = p + masking_key_length + payload_length_ -
+        connection_->recv_data().c_str();
+    connection_->Shift(pos);
+    return FRAME_OK;
+  }
+
+  virtual void Send(const std::string& message) {
+    std::vector<char> frame;
+    OpCode op_code = kOpCodeText;
+    size_t data_length = message.length();
+
+    frame.push_back(kFinalBit | op_code);
+    if (data_length <= kMaxSingleBytePayloadLength)
+      frame.push_back(kMaskBit | data_length);
+    else if (data_length <= 0xFFFF) {
+      frame.push_back(kMaskBit | kTwoBytePayloadLengthField);
+      frame.push_back((data_length & 0xFF00) >> 8);
+      frame.push_back(data_length & 0xFF);
+    } else {
+      frame.push_back(kMaskBit | kEightBytePayloadLengthField);
+      char extended_payload_length[8];
+      size_t remaining = data_length;
+      // Fill the length into extended_payload_length in the network byte order.
+      for (int i = 0; i < 8; ++i) {
+        extended_payload_length[7 - i] = remaining & 0xFF;
+        remaining >>= 8;
+      }
+      frame.insert(frame.end(),
+                   extended_payload_length,
+                   extended_payload_length + 8);
+      DCHECK(!remaining);
+    }
+
+    // Mask the frame.
+    size_t masking_key_start = frame.size();
+    // Add placeholder for masking key. Will be overwritten.
+    frame.resize(frame.size() + kMaskingKeyWidthInBytes);
+    size_t payload_start = frame.size();
+    const char* data = message.c_str();
+    frame.insert(frame.end(), data, data + data_length);
+
+    base::RandBytes(&frame[0] + masking_key_start,
+                    kMaskingKeyWidthInBytes);
+    for (size_t i = 0; i < data_length; ++i) {
+      frame[payload_start + i] ^=
+          frame[masking_key_start + i % kMaskingKeyWidthInBytes];
+    }
+    connection_->Send(&frame[0], frame.size());
+  }
+
+ private:
+  WebSocketHybi10(HttpConnection* connection,
+                  const HttpServerRequestInfo& request,
+                  size_t* pos)
+    : WebSocket(connection),
+      op_code_(0),
+      final_(false),
+      reserved1_(false),
+      reserved2_(false),
+      reserved3_(false),
+      masked_(false),
+      payload_(0),
+      payload_length_(0),
+      frame_end_(0) {
+  }
+
+  OpCode op_code_;
+  bool final_;
+  bool reserved1_;
+  bool reserved2_;
+  bool reserved3_;
+  bool masked_;
+  const char* payload_;
+  size_t payload_length_;
+  const char* frame_end_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketHybi10);
+};
+
+}  // anonymous namespace
+
+WebSocket* WebSocket::CreateWebSocket(HttpConnection* connection,
+                                      const HttpServerRequestInfo& request,
+                                      size_t* pos) {
+  WebSocket* socket = WebSocketHybi10::Create(connection, request, pos);
+  if (socket)
+    return socket;
+
+  return WebSocketHixie76::Create(connection, request, pos);
+}
+
+WebSocket::WebSocket(HttpConnection* connection) : connection_(connection) {
+}
+
+}  // namespace net