WebSocketChannel.cpp [plain text]
#include "config.h"
#if ENABLE(WEB_SOCKETS)
#include "WebSocketChannel.h"
#include "CookieJar.h"
#include "Document.h"
#include "Logging.h"
#include "PlatformString.h"
#include "ScriptExecutionContext.h"
#include "SocketStreamError.h"
#include "SocketStreamHandle.h"
#include "StringHash.h"
#include "WebSocketChannelClient.h"
#include "WebSocketHandshake.h"
#include <wtf/text/CString.h>
#include <wtf/Deque.h>
#include <wtf/FastMalloc.h>
#include <wtf/HashMap.h>
namespace WebCore {
WebSocketChannel::WebSocketChannel(ScriptExecutionContext* context, WebSocketChannelClient* client, const KURL& url, const String& protocol)
: m_context(context)
, m_client(client)
, m_handshake(url, protocol, context)
, m_buffer(0)
, m_bufferSize(0)
, m_resumeTimer(this, &WebSocketChannel::resumeTimerFired)
, m_suspended(false)
, m_closed(false)
, m_shouldDiscardReceivedData(false)
, m_unhandledBufferedAmount(0)
{
}
WebSocketChannel::~WebSocketChannel()
{
fastFree(m_buffer);
}
void WebSocketChannel::connect()
{
LOG(Network, "WebSocketChannel %p connect", this);
ASSERT(!m_handle);
ASSERT(!m_suspended);
m_handshake.reset();
ref();
m_handle = SocketStreamHandle::create(m_handshake.url(), this);
}
bool WebSocketChannel::send(const String& msg)
{
LOG(Network, "WebSocketChannel %p send %s", this, msg.utf8().data());
ASSERT(m_handle);
ASSERT(!m_suspended);
Vector<char> buf;
buf.append('\0'); buf.append(msg.utf8().data(), msg.utf8().length());
buf.append('\xff'); return m_handle->send(buf.data(), buf.size());
}
unsigned long WebSocketChannel::bufferedAmount() const
{
LOG(Network, "WebSocketChannel %p bufferedAmount", this);
ASSERT(m_handle);
ASSERT(!m_suspended);
return m_handle->bufferedAmount();
}
void WebSocketChannel::close()
{
LOG(Network, "WebSocketChannel %p close", this);
ASSERT(!m_suspended);
if (m_handle)
m_handle->close(); }
void WebSocketChannel::disconnect()
{
LOG(Network, "WebSocketChannel %p disconnect", this);
m_handshake.clearScriptExecutionContext();
m_client = 0;
m_context = 0;
if (m_handle)
m_handle->close();
}
void WebSocketChannel::suspend()
{
m_suspended = true;
}
void WebSocketChannel::resume()
{
m_suspended = false;
if ((m_buffer || m_closed) && m_client && !m_resumeTimer.isActive())
m_resumeTimer.startOneShot(0);
}
void WebSocketChannel::didOpen(SocketStreamHandle* handle)
{
LOG(Network, "WebSocketChannel %p didOpen", this);
ASSERT(handle == m_handle);
if (!m_context)
return;
const CString& handshakeMessage = m_handshake.clientHandshakeMessage();
if (!handle->send(handshakeMessage.data(), handshakeMessage.length())) {
m_context->addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, "Error sending handshake message.", 0, m_handshake.clientOrigin());
handle->close();
}
}
void WebSocketChannel::didClose(SocketStreamHandle* handle)
{
LOG(Network, "WebSocketChannel %p didClose", this);
ASSERT_UNUSED(handle, handle == m_handle || !m_handle);
m_closed = true;
if (m_handle) {
m_unhandledBufferedAmount = m_handle->bufferedAmount();
if (m_suspended)
return;
WebSocketChannelClient* client = m_client;
m_client = 0;
m_context = 0;
m_handle = 0;
if (client)
client->didClose(m_unhandledBufferedAmount);
}
deref();
}
void WebSocketChannel::didReceiveData(SocketStreamHandle* handle, const char* data, int len)
{
LOG(Network, "WebSocketChannel %p didReceiveData %d", this, len);
RefPtr<WebSocketChannel> protect(this); ASSERT(handle == m_handle);
if (!m_context) {
return;
}
if (!m_client) {
m_shouldDiscardReceivedData = true;
handle->close();
return;
}
if (m_shouldDiscardReceivedData)
return;
if (!appendToBuffer(data, len)) {
m_shouldDiscardReceivedData = true;
handle->close();
return;
}
while (!m_suspended && m_client && m_buffer)
if (!processBuffer())
break;
}
void WebSocketChannel::didFail(SocketStreamHandle* handle, const SocketStreamError&)
{
LOG(Network, "WebSocketChannel %p didFail", this);
ASSERT(handle == m_handle || !m_handle);
m_shouldDiscardReceivedData = true;
handle->close();
}
void WebSocketChannel::didReceiveAuthenticationChallenge(SocketStreamHandle*, const AuthenticationChallenge&)
{
}
void WebSocketChannel::didCancelAuthenticationChallenge(SocketStreamHandle*, const AuthenticationChallenge&)
{
}
bool WebSocketChannel::appendToBuffer(const char* data, size_t len)
{
size_t newBufferSize = m_bufferSize + len;
if (newBufferSize < m_bufferSize) {
LOG(Network, "WebSocket buffer overflow (%lu+%lu)", static_cast<unsigned long>(m_bufferSize), static_cast<unsigned long>(len));
return false;
}
char* newBuffer = 0;
if (tryFastMalloc(newBufferSize).getValue(newBuffer)) {
if (m_buffer)
memcpy(newBuffer, m_buffer, m_bufferSize);
memcpy(newBuffer + m_bufferSize, data, len);
fastFree(m_buffer);
m_buffer = newBuffer;
m_bufferSize = newBufferSize;
return true;
}
m_context->addMessage(JSMessageSource, LogMessageType, ErrorMessageLevel, String::format("WebSocket frame (at %lu bytes) is too long.", static_cast<unsigned long>(newBufferSize)), 0, m_handshake.clientOrigin());
return false;
}
void WebSocketChannel::skipBuffer(size_t len)
{
ASSERT(len <= m_bufferSize);
m_bufferSize -= len;
if (!m_bufferSize) {
fastFree(m_buffer);
m_buffer = 0;
return;
}
memmove(m_buffer, m_buffer + len, m_bufferSize);
}
bool WebSocketChannel::processBuffer()
{
ASSERT(!m_suspended);
ASSERT(m_client);
ASSERT(m_buffer);
if (m_shouldDiscardReceivedData)
return false;
if (m_handshake.mode() == WebSocketHandshake::Incomplete) {
int headerLength = m_handshake.readServerHandshake(m_buffer, m_bufferSize);
if (headerLength <= 0)
return false;
if (m_handshake.mode() == WebSocketHandshake::Connected) {
if (!m_handshake.serverSetCookie().isEmpty()) {
if (m_context->isDocument()) {
Document* document = static_cast<Document*>(m_context);
if (cookiesEnabled(document)) {
ExceptionCode ec; document->setCookie(m_handshake.serverSetCookie(), ec);
}
}
}
LOG(Network, "WebSocketChannel %p connected", this);
skipBuffer(headerLength);
m_client->didConnect();
LOG(Network, "remaining in read buf %lu", static_cast<unsigned long>(m_bufferSize));
return m_buffer;
}
LOG(Network, "WebSocketChannel %p connection failed", this);
skipBuffer(headerLength);
m_shouldDiscardReceivedData = true;
if (!m_closed)
m_handle->close();
return false;
}
if (m_handshake.mode() != WebSocketHandshake::Connected)
return false;
const char* nextFrame = m_buffer;
const char* p = m_buffer;
const char* end = p + m_bufferSize;
unsigned char frameByte = static_cast<unsigned char>(*p++);
if ((frameByte & 0x80) == 0x80) {
size_t length = 0;
bool errorFrame = false;
while (p < end) {
if (length > std::numeric_limits<size_t>::max() / 128) {
LOG(Network, "frame length overflow %lu", static_cast<unsigned long>(length));
errorFrame = true;
break;
}
size_t newLength = length * 128;
unsigned char msgByte = static_cast<unsigned char>(*p);
unsigned int lengthMsgByte = msgByte & 0x7f;
if (newLength > std::numeric_limits<size_t>::max() - lengthMsgByte) {
LOG(Network, "frame length overflow %lu+%u", static_cast<unsigned long>(newLength), lengthMsgByte);
errorFrame = true;
break;
}
newLength += lengthMsgByte;
if (newLength < length) { LOG(Network, "frame length integer wrap %lu->%lu", static_cast<unsigned long>(length), static_cast<unsigned long>(newLength));
errorFrame = true;
break;
}
length = newLength;
++p;
if (!(msgByte & 0x80))
break;
}
if (p + length < p) {
LOG(Network, "frame buffer pointer wrap %p+%lu->%p", p, static_cast<unsigned long>(length), p + length);
errorFrame = true;
}
if (errorFrame) {
skipBuffer(m_bufferSize); m_shouldDiscardReceivedData = true;
m_client->didReceiveMessageError();
if (!m_client)
return false;
if (!m_closed)
m_handle->close();
return false;
}
ASSERT(p + length >= p);
if (p + length < end) {
p += length;
nextFrame = p;
ASSERT(nextFrame > m_buffer);
skipBuffer(nextFrame - m_buffer);
m_client->didReceiveMessageError();
return m_buffer;
}
return false;
}
const char* msgStart = p;
while (p < end && *p != '\xff')
++p;
if (p < end && *p == '\xff') {
int msgLength = p - msgStart;
++p;
nextFrame = p;
if (frameByte == 0x00) {
String msg = String::fromUTF8(msgStart, msgLength);
skipBuffer(nextFrame - m_buffer);
m_client->didReceiveMessage(msg);
} else {
skipBuffer(nextFrame - m_buffer);
m_client->didReceiveMessageError();
}
return m_buffer;
}
return false;
}
void WebSocketChannel::resumeTimerFired(Timer<WebSocketChannel>* timer)
{
ASSERT_UNUSED(timer, timer == &m_resumeTimer);
RefPtr<WebSocketChannel> protect(this); while (!m_suspended && m_client && m_buffer)
if (!processBuffer())
break;
if (!m_suspended && m_client && m_closed && m_handle)
didClose(m_handle.get());
}
}
#endif // ENABLE(WEB_SOCKETS)