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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#if defined(_MSC_VER) && _MSC_VER < 1300
#pragma warning(disable:4786)
#endif
#include "talk/base/asynctcpsocket.h"
#include "talk/base/byteorder.h"
#include "talk/base/common.h"
#include "talk/base/logging.h"
#include <cstring>
#if defined(_MSC_VER) && _MSC_VER < 1300
namespace std {
using ::strerror;
}
#endif
#ifdef POSIX
extern "C" {
#include <errno.h>
}
#endif // POSIX
namespace cricket {
const size_t MAX_PACKET_SIZE = 64 * 1024;
typedef uint16 PacketLength;
const size_t PKT_LEN_SIZE = sizeof(PacketLength);
const size_t BUF_SIZE = MAX_PACKET_SIZE + PKT_LEN_SIZE;
AsyncTCPSocket::AsyncTCPSocket(AsyncSocket* socket) : AsyncPacketSocket(socket), insize_(BUF_SIZE), inpos_(0), outsize_(BUF_SIZE), outpos_(0) {
inbuf_ = new char[insize_];
outbuf_ = new char[outsize_];
ASSERT(socket_ != NULL);
socket_->SignalConnectEvent.connect(this, &AsyncTCPSocket::OnConnectEvent);
socket_->SignalReadEvent.connect(this, &AsyncTCPSocket::OnReadEvent);
socket_->SignalWriteEvent.connect(this, &AsyncTCPSocket::OnWriteEvent);
socket_->SignalCloseEvent.connect(this, &AsyncTCPSocket::OnCloseEvent);
}
AsyncTCPSocket::~AsyncTCPSocket() {
delete [] inbuf_;
delete [] outbuf_;
}
int AsyncTCPSocket::Send(const void *pv, size_t cb) {
if (cb > MAX_PACKET_SIZE) {
socket_->SetError(EMSGSIZE);
return -1;
}
// If we are blocking on send, then silently drop this packet
if (outpos_)
return static_cast<int>(cb);
PacketLength pkt_len = HostToNetwork16(static_cast<PacketLength>(cb));
memcpy(outbuf_, &pkt_len, PKT_LEN_SIZE);
memcpy(outbuf_ + PKT_LEN_SIZE, pv, cb);
outpos_ = PKT_LEN_SIZE + cb;
int res = Flush();
if (res <= 0) {
// drop packet if we made no progress
outpos_ = 0;
return res;
}
// We claim to have sent the whole thing, even if we only sent partial
return static_cast<int>(cb);
}
int AsyncTCPSocket::SendTo(const void *pv, size_t cb, const SocketAddress& addr) {
if (addr == GetRemoteAddress())
return Send(pv, cb);
ASSERT(false);
socket_->SetError(ENOTCONN);
return -1;
}
int AsyncTCPSocket::SendRaw(const void * pv, size_t cb) {
if (outpos_ + cb > outsize_) {
socket_->SetError(EMSGSIZE);
return -1;
}
memcpy(outbuf_ + outpos_, pv, cb);
outpos_ += cb;
return Flush();
}
void AsyncTCPSocket::ProcessInput(char * data, size_t& len) {
SocketAddress remote_addr(GetRemoteAddress());
while (true) {
if (len < PKT_LEN_SIZE)
return;
PacketLength pkt_len;
memcpy(&pkt_len, data, PKT_LEN_SIZE);
pkt_len = NetworkToHost16(pkt_len);
if (len < PKT_LEN_SIZE + pkt_len)
return;
SignalReadPacket(data + PKT_LEN_SIZE, pkt_len, remote_addr, this);
len -= PKT_LEN_SIZE + pkt_len;
if (len > 0) {
memmove(data, data + PKT_LEN_SIZE + pkt_len, len);
}
}
}
int AsyncTCPSocket::Flush() {
int res = socket_->Send(outbuf_, outpos_);
if (res <= 0) {
return res;
}
if (static_cast<size_t>(res) <= outpos_) {
outpos_ -= res;
} else {
ASSERT(false);
return -1;
}
if (outpos_ > 0) {
memmove(outbuf_, outbuf_ + res, outpos_);
}
return res;
}
void AsyncTCPSocket::OnConnectEvent(AsyncSocket* socket) {
SignalConnect(this);
}
void AsyncTCPSocket::OnReadEvent(AsyncSocket* socket) {
ASSERT(socket == socket_);
int len = socket_->Recv(inbuf_ + inpos_, insize_ - inpos_);
if (len < 0) {
// TODO: Do something better like forwarding the error to the user.
LOG(INFO) << "recvfrom: " << errno << " " << std::strerror(errno);
return;
}
inpos_ += len;
ProcessInput(inbuf_, inpos_);
if (inpos_ >= insize_) {
LOG(INFO) << "input buffer overflow";
ASSERT(false);
inpos_ = 0;
}
}
void AsyncTCPSocket::OnWriteEvent(AsyncSocket* socket) {
ASSERT(socket == socket_);
if (outpos_ > 0) {
Flush();
}
}
void AsyncTCPSocket::OnCloseEvent(AsyncSocket* socket, int error) {
SignalClose(this, error);
}
} // namespace cricket
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