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// Copyright (c) 2012 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/logging.h"
#include "base/md5.h"
#include "base/sha1.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/sys_byteorder.h"
#include "net/server/http_connection.h"
#include "net/server/http_server.h"
#include "net/server/http_server_request_info.h"
#include "net/server/http_server_response_info.h"
#include "net/server/web_socket_encoder.h"
namespace net {
namespace {
static uint32 WebSocketKeyFingerprint(const std::string& str) {
std::string result;
const char* p_char = str.c_str();
int length = str.length();
int spaces = 0;
for (int i = 0; i < length; ++i) {
if (p_char[i] >= '0' && p_char[i] <= '9')
result.append(&p_char[i], 1);
else if (p_char[i] == ' ')
spaces++;
}
if (spaces == 0)
return 0;
int64 number = 0;
if (!base::StringToInt64(result, &number))
return 0;
return base::HostToNet32(static_cast<uint32>(number / spaces));
}
class WebSocketHixie76 : public WebSocket {
public:
static WebSocket* Create(HttpServer* server,
HttpConnection* connection,
const HttpServerRequestInfo& request,
size_t* pos) {
if (connection->read_buf()->GetSize() <
static_cast<int>(*pos + kWebSocketHandshakeBodyLen))
return NULL;
return new WebSocketHixie76(server, connection, request, pos);
}
void Accept(const HttpServerRequestInfo& request) override {
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;
server_->SendRaw(
connection_->id(),
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()));
server_->SendRaw(connection_->id(),
std::string(reinterpret_cast<char*>(digest.a), 16));
}
ParseResult Read(std::string* message) override {
DCHECK(message);
HttpConnection::ReadIOBuffer* read_buf = connection_->read_buf();
if (read_buf->StartOfBuffer()[0])
return FRAME_ERROR;
base::StringPiece data(read_buf->StartOfBuffer(), read_buf->GetSize());
size_t pos = data.find('\377', 1);
if (pos == base::StringPiece::npos)
return FRAME_INCOMPLETE;
message->assign(data.data() + 1, pos - 1);
read_buf->DidConsume(pos + 1);
return FRAME_OK;
}
void Send(const std::string& message) override {
char message_start = 0;
char message_end = -1;
server_->SendRaw(connection_->id(), std::string(1, message_start));
server_->SendRaw(connection_->id(), message);
server_->SendRaw(connection_->id(), std::string(1, message_end));
}
private:
static const int kWebSocketHandshakeBodyLen;
WebSocketHixie76(HttpServer* server,
HttpConnection* connection,
const HttpServerRequestInfo& request,
size_t* pos)
: WebSocket(server, connection) {
std::string key1 = request.GetHeaderValue("sec-websocket-key1");
std::string key2 = request.GetHeaderValue("sec-websocket-key2");
if (key1.empty()) {
server->SendResponse(
connection->id(),
HttpServerResponseInfo::CreateFor500(
"Invalid request format. Sec-WebSocket-Key1 is empty or isn't "
"specified."));
return;
}
if (key2.empty()) {
server->SendResponse(
connection->id(),
HttpServerResponseInfo::CreateFor500(
"Invalid request format. Sec-WebSocket-Key2 is empty or isn't "
"specified."));
return;
}
key3_.assign(connection->read_buf()->StartOfBuffer() + *pos,
kWebSocketHandshakeBodyLen);
*pos += kWebSocketHandshakeBodyLen;
}
std::string key3_;
DISALLOW_COPY_AND_ASSIGN(WebSocketHixie76);
};
const int WebSocketHixie76::kWebSocketHandshakeBodyLen = 8;
class WebSocketHybi17 : public WebSocket {
public:
static WebSocket* Create(HttpServer* server,
HttpConnection* connection,
const HttpServerRequestInfo& request,
size_t* pos) {
std::string version = request.GetHeaderValue("sec-websocket-version");
if (version != "8" && version != "13")
return NULL;
std::string key = request.GetHeaderValue("sec-websocket-key");
if (key.empty()) {
server->SendResponse(
connection->id(),
HttpServerResponseInfo::CreateFor500(
"Invalid request format. Sec-WebSocket-Key is empty or isn't "
"specified."));
return NULL;
}
return new WebSocketHybi17(server, connection, request, pos);
}
void Accept(const HttpServerRequestInfo& request) override {
static const char* const kWebSocketGuid =
"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
std::string key = request.GetHeaderValue("sec-websocket-key");
std::string data = base::StringPrintf("%s%s", key.c_str(), kWebSocketGuid);
std::string encoded_hash;
base::Base64Encode(base::SHA1HashString(data), &encoded_hash);
server_->SendRaw(connection_->id(),
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"
"%s"
"\r\n",
encoded_hash.c_str(), response_extensions_.c_str()));
}
ParseResult Read(std::string* message) override {
HttpConnection::ReadIOBuffer* read_buf = connection_->read_buf();
base::StringPiece frame(read_buf->StartOfBuffer(), read_buf->GetSize());
int bytes_consumed = 0;
ParseResult result = encoder_->DecodeFrame(frame, &bytes_consumed, message);
if (result == FRAME_OK)
read_buf->DidConsume(bytes_consumed);
if (result == FRAME_CLOSE)
closed_ = true;
return result;
}
void Send(const std::string& message) override {
if (closed_)
return;
std::string encoded;
encoder_->EncodeFrame(message, 0, &encoded);
server_->SendRaw(connection_->id(), encoded);
}
private:
WebSocketHybi17(HttpServer* server,
HttpConnection* connection,
const HttpServerRequestInfo& request,
size_t* pos)
: WebSocket(server, connection),
closed_(false) {
std::string request_extensions =
request.GetHeaderValue("sec-websocket-extensions");
encoder_.reset(WebSocketEncoder::CreateServer(request_extensions,
&response_extensions_));
if (!response_extensions_.empty()) {
response_extensions_ =
"Sec-WebSocket-Extensions: " + response_extensions_ + "\r\n";
}
}
scoped_ptr<WebSocketEncoder> encoder_;
std::string response_extensions_;
bool closed_;
DISALLOW_COPY_AND_ASSIGN(WebSocketHybi17);
};
} // anonymous namespace
WebSocket* WebSocket::CreateWebSocket(HttpServer* server,
HttpConnection* connection,
const HttpServerRequestInfo& request,
size_t* pos) {
WebSocket* socket = WebSocketHybi17::Create(server, connection, request, pos);
if (socket)
return socket;
return WebSocketHixie76::Create(server, connection, request, pos);
}
WebSocket::WebSocket(HttpServer* server, HttpConnection* connection)
: server_(server),
connection_(connection) {
}
WebSocket::~WebSocket() {
}
} // namespace net
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