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// Copyright (c) 2010 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/websockets/websocket_handshake.h"
#include "base/ref_counted.h"
#include "base/string_util.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
namespace net {
const int WebSocketHandshake::kWebSocketPort = 80;
const int WebSocketHandshake::kSecureWebSocketPort = 443;
const char WebSocketHandshake::kServerHandshakeHeader[] =
"HTTP/1.1 101 Web Socket Protocol Handshake\r\n";
const size_t WebSocketHandshake::kServerHandshakeHeaderLength =
sizeof(kServerHandshakeHeader) - 1;
const char WebSocketHandshake::kUpgradeHeader[] = "Upgrade: WebSocket\r\n";
const size_t WebSocketHandshake::kUpgradeHeaderLength =
sizeof(kUpgradeHeader) - 1;
const char WebSocketHandshake::kConnectionHeader[] = "Connection: Upgrade\r\n";
const size_t WebSocketHandshake::kConnectionHeaderLength =
sizeof(kConnectionHeader) - 1;
WebSocketHandshake::WebSocketHandshake(
const GURL& url,
const std::string& origin,
const std::string& location,
const std::string& protocol)
: url_(url),
origin_(origin),
location_(location),
protocol_(protocol),
mode_(MODE_INCOMPLETE) {
}
WebSocketHandshake::~WebSocketHandshake() {
}
bool WebSocketHandshake::is_secure() const {
return url_.SchemeIs("wss");
}
std::string WebSocketHandshake::CreateClientHandshakeMessage() const {
std::string msg;
msg = "GET ";
msg += url_.path();
if (url_.has_query()) {
msg += "?";
msg += url_.query();
}
msg += " HTTP/1.1\r\n";
msg += kUpgradeHeader;
msg += kConnectionHeader;
msg += "Host: ";
msg += StringToLowerASCII(url_.host());
if (url_.has_port()) {
bool secure = is_secure();
int port = url_.EffectiveIntPort();
if ((!secure &&
port != kWebSocketPort && port != url_parse::PORT_UNSPECIFIED) ||
(secure &&
port != kSecureWebSocketPort && port != url_parse::PORT_UNSPECIFIED)) {
msg += ":";
msg += IntToString(port);
}
}
msg += "\r\n";
msg += "Origin: ";
// It's OK to lowercase the origin as the Origin header does not contain
// the path or query portions, as per
// http://tools.ietf.org/html/draft-abarth-origin-00.
//
// TODO(satorux): Should we trim the port portion here if it's 80 for
// http:// or 443 for https:// ? Or can we assume it's done by the
// client of the library?
msg += StringToLowerASCII(origin_);
msg += "\r\n";
if (!protocol_.empty()) {
msg += "WebSocket-Protocol: ";
msg += protocol_;
msg += "\r\n";
}
// TODO(ukai): Add cookie if necessary.
msg += "\r\n";
return msg;
}
int WebSocketHandshake::ReadServerHandshake(const char* data, size_t len) {
mode_ = MODE_INCOMPLETE;
if (len < kServerHandshakeHeaderLength) {
return -1;
}
if (!memcmp(data, kServerHandshakeHeader, kServerHandshakeHeaderLength)) {
mode_ = MODE_NORMAL;
} else {
int eoh = HttpUtil::LocateEndOfHeaders(data, len);
if (eoh < 0)
return -1;
return eoh;
}
const char* p = data + kServerHandshakeHeaderLength;
const char* end = data + len + 1;
if (mode_ == MODE_NORMAL) {
size_t header_size = end - p;
if (header_size < kUpgradeHeaderLength)
return -1;
if (memcmp(p, kUpgradeHeader, kUpgradeHeaderLength)) {
mode_ = MODE_FAILED;
DLOG(INFO) << "Bad Upgrade Header "
<< std::string(p, kUpgradeHeaderLength);
return p - data;
}
p += kUpgradeHeaderLength;
header_size = end - p;
if (header_size < kConnectionHeaderLength)
return -1;
if (memcmp(p, kConnectionHeader, kConnectionHeaderLength)) {
mode_ = MODE_FAILED;
DLOG(INFO) << "Bad Connection Header "
<< std::string(p, kConnectionHeaderLength);
return p - data;
}
p += kConnectionHeaderLength;
}
int eoh = HttpUtil::LocateEndOfHeaders(data, len);
if (eoh == -1)
return eoh;
scoped_refptr<HttpResponseHeaders> headers(
new HttpResponseHeaders(HttpUtil::AssembleRawHeaders(data, eoh)));
if (!ProcessHeaders(*headers)) {
DLOG(INFO) << "Process Headers failed: "
<< std::string(data, eoh);
mode_ = MODE_FAILED;
}
switch (mode_) {
case MODE_NORMAL:
if (CheckResponseHeaders()) {
mode_ = MODE_CONNECTED;
} else {
mode_ = MODE_FAILED;
}
break;
default:
mode_ = MODE_FAILED;
break;
}
return eoh;
}
// Gets the value of the specified header.
// It assures only one header of |name| in |headers|.
// Returns true iff single header of |name| is found in |headers|
// and |value| is filled with the value.
// Returns false otherwise.
static bool GetSingleHeader(const HttpResponseHeaders& headers,
const std::string& name,
std::string* value) {
std::string first_value;
void* iter = NULL;
if (!headers.EnumerateHeader(&iter, name, &first_value))
return false;
// Checks no more |name| found in |headers|.
// Second call of EnumerateHeader() must return false.
std::string second_value;
if (headers.EnumerateHeader(&iter, name, &second_value))
return false;
*value = first_value;
return true;
}
bool WebSocketHandshake::ProcessHeaders(const HttpResponseHeaders& headers) {
if (!GetSingleHeader(headers, "websocket-origin", &ws_origin_))
return false;
if (!GetSingleHeader(headers, "websocket-location", &ws_location_))
return false;
// If |protocol_| is not specified by client, we don't care if there's
// protocol field or not as specified in the spec.
if (!protocol_.empty()
&& !GetSingleHeader(headers, "websocket-protocol", &ws_protocol_))
return false;
return true;
}
bool WebSocketHandshake::CheckResponseHeaders() const {
DCHECK(mode_ == MODE_NORMAL);
if (!LowerCaseEqualsASCII(origin_, ws_origin_.c_str()))
return false;
if (location_ != ws_location_)
return false;
if (!protocol_.empty() && protocol_ != ws_protocol_)
return false;
return true;
}
} // namespace net
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