522 lines
19 KiB
C++
522 lines
19 KiB
C++
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/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* This is a diagram of how TCP reconnect works for the active side. The
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* passive side just waits for an incoming connection.
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*
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* - Connected: Indicate whether the TCP socket is connected.
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*
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* - Writable: Whether the stun binding is completed. Sending a data packet
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* before stun binding completed will trigger IPC socket layer to shutdown
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* the connection.
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*
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* - PendingTCP: |connection_pending_| indicates whether there is an
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* outstanding TCP connection in progress.
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*
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* - PretendWri: Tracked by |pretending_to_be_writable_|. Marking connection as
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* WRITE_TIMEOUT will cause the connection be deleted. Instead, we're
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* "pretending" we're still writable for a period of time such that reconnect
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* could work.
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*
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* Data could only be sent in state 3. Sening data during state 2 & 6 will get
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* EWOULDBLOCK, 4 & 5 EPIPE.
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*
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* OS Timeout 7 -------------+
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* +----------------------->|Connected: N |
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* | |Writable: N | Timeout
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* | Timeout |Connection is |<----------------+
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* | +------------------->|Dead | |
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* | | +--------------+ |
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* | | ^ |
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* | | OnClose | |
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* | | +-----------------------+ | |
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* | | | | |Timeout |
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* | | v | | |
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* | 4 +----------+ 5 -----+--+--+ 6 -----+-----+
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* | |Connected: N|Send() or |Connected: N| |Connected: Y|
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* | |Writable: Y|Ping() |Writable: Y|OnConnect |Writable: Y|
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* | |PendingTCP:N+--------> |PendingTCP:Y+---------> |PendingTCP:N|
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* | |PretendWri:Y| |PretendWri:Y| |PretendWri:Y|
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* | +-----+------+ +------------+ +---+--+-----+
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* | ^ ^ | |
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* | | | OnClose | |
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* | | +----------------------------------------------+ |
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* | | |
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* | | Stun Binding Completed |
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* | | |
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* | | OnClose |
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* | +------------------------------------------------+ |
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* | | v
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* 1 -----------+ 2 -----------+Stun 3 -----------+
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* |Connected: N| |Connected: Y|Binding |Connected: Y|
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* |Writable: N|OnConnect |Writable: N|Completed |Writable: Y|
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* |PendingTCP:Y+---------> |PendingTCP:N+--------> |PendingTCP:N|
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* |PretendWri:N| |PretendWri:N| |PretendWri:N|
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* +------------+ +------------+ +------------+
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*
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*/
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#include "webrtc/p2p/base/tcpport.h"
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#include "webrtc/p2p/base/common.h"
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#include "webrtc/base/common.h"
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#include "webrtc/base/logging.h"
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namespace cricket {
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TCPPort::TCPPort(rtc::Thread* thread,
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rtc::PacketSocketFactory* factory,
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rtc::Network* network,
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const rtc::IPAddress& ip,
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uint16_t min_port,
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uint16_t max_port,
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const std::string& username,
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const std::string& password,
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bool allow_listen)
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: Port(thread,
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LOCAL_PORT_TYPE,
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factory,
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network,
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ip,
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min_port,
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max_port,
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username,
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password),
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incoming_only_(false),
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allow_listen_(allow_listen),
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socket_(NULL),
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error_(0) {
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// TODO(mallinath) - Set preference value as per RFC 6544.
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// http://b/issue?id=7141794
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}
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bool TCPPort::Init() {
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if (allow_listen_) {
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// Treat failure to create or bind a TCP socket as fatal. This
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// should never happen.
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socket_ = socket_factory()->CreateServerTcpSocket(
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rtc::SocketAddress(ip(), 0), min_port(), max_port(),
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false /* ssl */);
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if (!socket_) {
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LOG_J(LS_ERROR, this) << "TCP socket creation failed.";
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return false;
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}
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socket_->SignalNewConnection.connect(this, &TCPPort::OnNewConnection);
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socket_->SignalAddressReady.connect(this, &TCPPort::OnAddressReady);
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}
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return true;
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}
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TCPPort::~TCPPort() {
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delete socket_;
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std::list<Incoming>::iterator it;
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for (it = incoming_.begin(); it != incoming_.end(); ++it)
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delete it->socket;
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incoming_.clear();
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}
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Connection* TCPPort::CreateConnection(const Candidate& address,
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CandidateOrigin origin) {
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if (!SupportsProtocol(address.protocol())) {
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return NULL;
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}
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if (address.tcptype() == TCPTYPE_ACTIVE_STR ||
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(address.tcptype().empty() && address.address().port() == 0)) {
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// It's active only candidate, we should not try to create connections
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// for these candidates.
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return NULL;
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}
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// We can't accept TCP connections incoming on other ports
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if (origin == ORIGIN_OTHER_PORT)
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return NULL;
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// Check if we are allowed to make outgoing TCP connections
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if (incoming_only_ && (origin == ORIGIN_MESSAGE))
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return NULL;
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// We don't know how to act as an ssl server yet
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if ((address.protocol() == SSLTCP_PROTOCOL_NAME) &&
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(origin == ORIGIN_THIS_PORT)) {
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return NULL;
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}
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if (!IsCompatibleAddress(address.address())) {
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return NULL;
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}
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TCPConnection* conn = NULL;
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if (rtc::AsyncPacketSocket* socket =
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GetIncoming(address.address(), true)) {
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socket->SignalReadPacket.disconnect(this);
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conn = new TCPConnection(this, address, socket);
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} else {
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conn = new TCPConnection(this, address);
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}
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AddOrReplaceConnection(conn);
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return conn;
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}
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void TCPPort::PrepareAddress() {
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if (socket_) {
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// If socket isn't bound yet the address will be added in
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// OnAddressReady(). Socket may be in the CLOSED state if Listen()
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// failed, we still want to add the socket address.
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LOG(LS_VERBOSE) << "Preparing TCP address, current state: "
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<< socket_->GetState();
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if (socket_->GetState() == rtc::AsyncPacketSocket::STATE_BOUND ||
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socket_->GetState() == rtc::AsyncPacketSocket::STATE_CLOSED)
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AddAddress(socket_->GetLocalAddress(), socket_->GetLocalAddress(),
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rtc::SocketAddress(), TCP_PROTOCOL_NAME, "",
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TCPTYPE_PASSIVE_STR, LOCAL_PORT_TYPE,
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ICE_TYPE_PREFERENCE_HOST_TCP, 0, true);
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} else {
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LOG_J(LS_INFO, this) << "Not listening due to firewall restrictions.";
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// Note: We still add the address, since otherwise the remote side won't
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// recognize our incoming TCP connections. According to
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// https://tools.ietf.org/html/rfc6544#section-4.5, for active candidate,
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// the port must be set to the discard port, i.e. 9.
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AddAddress(rtc::SocketAddress(ip(), DISCARD_PORT),
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rtc::SocketAddress(ip(), 0), rtc::SocketAddress(),
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TCP_PROTOCOL_NAME, "", TCPTYPE_ACTIVE_STR, LOCAL_PORT_TYPE,
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ICE_TYPE_PREFERENCE_HOST_TCP, 0, true);
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}
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}
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int TCPPort::SendTo(const void* data, size_t size,
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const rtc::SocketAddress& addr,
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const rtc::PacketOptions& options,
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bool payload) {
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rtc::AsyncPacketSocket * socket = NULL;
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TCPConnection* conn = static_cast<TCPConnection*>(GetConnection(addr));
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// For Connection, this is the code path used by Ping() to establish
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// WRITABLE. It has to send through the socket directly as TCPConnection::Send
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// checks writability.
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if (conn) {
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if (!conn->connected()) {
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conn->MaybeReconnect();
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return SOCKET_ERROR;
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}
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socket = conn->socket();
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} else {
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socket = GetIncoming(addr);
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}
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if (!socket) {
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LOG_J(LS_ERROR, this) << "Attempted to send to an unknown destination, "
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<< addr.ToSensitiveString();
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return SOCKET_ERROR; // TODO(tbd): Set error_
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}
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int sent = socket->Send(data, size, options);
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if (sent < 0) {
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error_ = socket->GetError();
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// Error from this code path for a Connection (instead of from a bare
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// socket) will not trigger reconnecting. In theory, this shouldn't matter
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// as OnClose should always be called and set connected to false.
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LOG_J(LS_ERROR, this) << "TCP send of " << size
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<< " bytes failed with error " << error_;
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}
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return sent;
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}
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int TCPPort::GetOption(rtc::Socket::Option opt, int* value) {
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if (socket_) {
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return socket_->GetOption(opt, value);
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} else {
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return SOCKET_ERROR;
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}
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}
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int TCPPort::SetOption(rtc::Socket::Option opt, int value) {
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if (socket_) {
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return socket_->SetOption(opt, value);
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} else {
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return SOCKET_ERROR;
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}
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}
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int TCPPort::GetError() {
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return error_;
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}
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void TCPPort::OnNewConnection(rtc::AsyncPacketSocket* socket,
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rtc::AsyncPacketSocket* new_socket) {
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ASSERT(socket == socket_);
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Incoming incoming;
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incoming.addr = new_socket->GetRemoteAddress();
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incoming.socket = new_socket;
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incoming.socket->SignalReadPacket.connect(this, &TCPPort::OnReadPacket);
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incoming.socket->SignalReadyToSend.connect(this, &TCPPort::OnReadyToSend);
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incoming.socket->SignalSentPacket.connect(this, &TCPPort::OnSentPacket);
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LOG_J(LS_VERBOSE, this) << "Accepted connection from "
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<< incoming.addr.ToSensitiveString();
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incoming_.push_back(incoming);
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}
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rtc::AsyncPacketSocket* TCPPort::GetIncoming(
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const rtc::SocketAddress& addr, bool remove) {
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rtc::AsyncPacketSocket* socket = NULL;
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for (std::list<Incoming>::iterator it = incoming_.begin();
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it != incoming_.end(); ++it) {
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if (it->addr == addr) {
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socket = it->socket;
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if (remove)
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incoming_.erase(it);
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break;
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}
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}
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return socket;
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}
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void TCPPort::OnReadPacket(rtc::AsyncPacketSocket* socket,
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const char* data, size_t size,
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const rtc::SocketAddress& remote_addr,
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const rtc::PacketTime& packet_time) {
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Port::OnReadPacket(data, size, remote_addr, PROTO_TCP);
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}
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void TCPPort::OnSentPacket(rtc::AsyncPacketSocket* socket,
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const rtc::SentPacket& sent_packet) {
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PortInterface::SignalSentPacket(sent_packet);
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}
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void TCPPort::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
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Port::OnReadyToSend();
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}
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void TCPPort::OnAddressReady(rtc::AsyncPacketSocket* socket,
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const rtc::SocketAddress& address) {
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AddAddress(address, address, rtc::SocketAddress(), TCP_PROTOCOL_NAME, "",
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TCPTYPE_PASSIVE_STR, LOCAL_PORT_TYPE, ICE_TYPE_PREFERENCE_HOST_TCP,
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0, true);
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}
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TCPConnection::TCPConnection(TCPPort* port,
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const Candidate& candidate,
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rtc::AsyncPacketSocket* socket)
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: Connection(port, 0, candidate),
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socket_(socket),
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error_(0),
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outgoing_(socket == NULL),
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connection_pending_(false),
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pretending_to_be_writable_(false),
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reconnection_timeout_(cricket::CONNECTION_WRITE_CONNECT_TIMEOUT) {
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if (outgoing_) {
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CreateOutgoingTcpSocket();
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} else {
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// Incoming connections should match the network address.
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LOG_J(LS_VERBOSE, this)
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<< "socket ipaddr: " << socket_->GetLocalAddress().ToString()
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<< ",port() ip:" << port->ip().ToString();
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ASSERT(socket_->GetLocalAddress().ipaddr() == port->ip());
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ConnectSocketSignals(socket);
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}
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}
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TCPConnection::~TCPConnection() {
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}
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int TCPConnection::Send(const void* data, size_t size,
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const rtc::PacketOptions& options) {
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if (!socket_) {
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error_ = ENOTCONN;
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return SOCKET_ERROR;
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}
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// Sending after OnClose on active side will trigger a reconnect for a
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// outgoing connection. Note that the write state is still WRITABLE as we want
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// to spend a few seconds attempting a reconnect before saying we're
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// unwritable.
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if (!connected()) {
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MaybeReconnect();
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return SOCKET_ERROR;
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}
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// Note that this is important to put this after the previous check to give
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// the connection a chance to reconnect.
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if (pretending_to_be_writable_ || write_state() != STATE_WRITABLE) {
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// TODO: Should STATE_WRITE_TIMEOUT return a non-blocking error?
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error_ = EWOULDBLOCK;
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return SOCKET_ERROR;
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}
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stats_.sent_total_packets++;
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int sent = socket_->Send(data, size, options);
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if (sent < 0) {
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stats_.sent_discarded_packets++;
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error_ = socket_->GetError();
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} else {
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send_rate_tracker_.AddSamples(sent);
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}
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return sent;
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}
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int TCPConnection::GetError() {
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return error_;
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}
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||
|
|
|
||
|
|
void TCPConnection::OnConnectionRequestResponse(ConnectionRequest* req,
|
||
|
|
StunMessage* response) {
|
||
|
|
// Process the STUN response before we inform upper layer ready to send.
|
||
|
|
Connection::OnConnectionRequestResponse(req, response);
|
||
|
|
|
||
|
|
// If we're in the state of pretending to be writeable, we should inform the
|
||
|
|
// upper layer it's ready to send again as previous EWOULDLBLOCK from socket
|
||
|
|
// would have stopped the outgoing stream.
|
||
|
|
if (pretending_to_be_writable_) {
|
||
|
|
Connection::OnReadyToSend();
|
||
|
|
}
|
||
|
|
pretending_to_be_writable_ = false;
|
||
|
|
ASSERT(write_state() == STATE_WRITABLE);
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::OnConnect(rtc::AsyncPacketSocket* socket) {
|
||
|
|
ASSERT(socket == socket_.get());
|
||
|
|
// Do not use this connection if the socket bound to a different address than
|
||
|
|
// the one we asked for. This is seen in Chrome, where TCP sockets cannot be
|
||
|
|
// given a binding address, and the platform is expected to pick the
|
||
|
|
// correct local address.
|
||
|
|
const rtc::SocketAddress& socket_addr = socket->GetLocalAddress();
|
||
|
|
if (socket_addr.ipaddr() == port()->ip()) {
|
||
|
|
LOG_J(LS_VERBOSE, this) << "Connection established to "
|
||
|
|
<< socket->GetRemoteAddress().ToSensitiveString();
|
||
|
|
} else if (IPIsAny(port()->ip())) {
|
||
|
|
LOG(LS_WARNING) << "Socket is bound to a different address:"
|
||
|
|
<< socket_addr.ipaddr().ToString()
|
||
|
|
<< ", rather then the local port:"
|
||
|
|
<< port()->ip().ToString()
|
||
|
|
<< ". Still allowing it since it's any address"
|
||
|
|
<< ", possibly caused by multi-routes being disabled.";
|
||
|
|
} else if (socket_addr.IsLoopbackIP()) {
|
||
|
|
LOG(LS_WARNING) << "Socket is bound to a different address:"
|
||
|
|
<< socket_addr.ipaddr().ToString()
|
||
|
|
<< ", rather then the local port:"
|
||
|
|
<< port()->ip().ToString()
|
||
|
|
<< ". Still allowing it since it's localhost.";
|
||
|
|
} else {
|
||
|
|
LOG_J(LS_WARNING, this) << "Dropping connection as TCP socket bound to IP "
|
||
|
|
<< socket_addr.ipaddr().ToSensitiveString()
|
||
|
|
<< ", different from the local candidate IP "
|
||
|
|
<< port()->ip().ToSensitiveString();
|
||
|
|
OnClose(socket, 0);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Connection is established successfully.
|
||
|
|
set_connected(true);
|
||
|
|
connection_pending_ = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::OnClose(rtc::AsyncPacketSocket* socket, int error) {
|
||
|
|
ASSERT(socket == socket_.get());
|
||
|
|
LOG_J(LS_INFO, this) << "Connection closed with error " << error;
|
||
|
|
|
||
|
|
// Guard against the condition where IPC socket will call OnClose for every
|
||
|
|
// packet it can't send.
|
||
|
|
if (connected()) {
|
||
|
|
set_connected(false);
|
||
|
|
|
||
|
|
// Prevent the connection from being destroyed by redundant SignalClose
|
||
|
|
// events.
|
||
|
|
pretending_to_be_writable_ = true;
|
||
|
|
|
||
|
|
// We don't attempt reconnect right here. This is to avoid a case where the
|
||
|
|
// shutdown is intentional and reconnect is not necessary. We only reconnect
|
||
|
|
// when the connection is used to Send() or Ping().
|
||
|
|
port()->thread()->PostDelayed(RTC_FROM_HERE, reconnection_timeout(), this,
|
||
|
|
MSG_TCPCONNECTION_DELAYED_ONCLOSE);
|
||
|
|
} else if (!pretending_to_be_writable_) {
|
||
|
|
// OnClose could be called when the underneath socket times out during the
|
||
|
|
// initial connect() (i.e. |pretending_to_be_writable_| is false) . We have
|
||
|
|
// to manually destroy here as this connection, as never connected, will not
|
||
|
|
// be scheduled for ping to trigger destroy.
|
||
|
|
Destroy();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::OnMessage(rtc::Message* pmsg) {
|
||
|
|
switch (pmsg->message_id) {
|
||
|
|
case MSG_TCPCONNECTION_DELAYED_ONCLOSE:
|
||
|
|
// If this connection can't become connected and writable again in 5
|
||
|
|
// seconds, it's time to tear this down. This is the case for the original
|
||
|
|
// TCP connection on passive side during a reconnect.
|
||
|
|
if (pretending_to_be_writable_) {
|
||
|
|
Destroy();
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
Connection::OnMessage(pmsg);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::MaybeReconnect() {
|
||
|
|
// Only reconnect for an outgoing TCPConnection when OnClose was signaled and
|
||
|
|
// no outstanding reconnect is pending.
|
||
|
|
if (connected() || connection_pending_ || !outgoing_) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
LOG_J(LS_INFO, this) << "TCP Connection with remote is closed, "
|
||
|
|
<< "trying to reconnect";
|
||
|
|
|
||
|
|
CreateOutgoingTcpSocket();
|
||
|
|
error_ = EPIPE;
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::OnReadPacket(
|
||
|
|
rtc::AsyncPacketSocket* socket, const char* data, size_t size,
|
||
|
|
const rtc::SocketAddress& remote_addr,
|
||
|
|
const rtc::PacketTime& packet_time) {
|
||
|
|
ASSERT(socket == socket_.get());
|
||
|
|
Connection::OnReadPacket(data, size, packet_time);
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::OnReadyToSend(rtc::AsyncPacketSocket* socket) {
|
||
|
|
ASSERT(socket == socket_.get());
|
||
|
|
Connection::OnReadyToSend();
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::CreateOutgoingTcpSocket() {
|
||
|
|
ASSERT(outgoing_);
|
||
|
|
// TODO(guoweis): Handle failures here (unlikely since TCP).
|
||
|
|
int opts = (remote_candidate().protocol() == SSLTCP_PROTOCOL_NAME)
|
||
|
|
? rtc::PacketSocketFactory::OPT_SSLTCP
|
||
|
|
: 0;
|
||
|
|
socket_.reset(port()->socket_factory()->CreateClientTcpSocket(
|
||
|
|
rtc::SocketAddress(port()->ip(), 0), remote_candidate().address(),
|
||
|
|
port()->proxy(), port()->user_agent(), opts));
|
||
|
|
if (socket_) {
|
||
|
|
LOG_J(LS_VERBOSE, this)
|
||
|
|
<< "Connecting from " << socket_->GetLocalAddress().ToSensitiveString()
|
||
|
|
<< " to " << remote_candidate().address().ToSensitiveString();
|
||
|
|
set_connected(false);
|
||
|
|
connection_pending_ = true;
|
||
|
|
ConnectSocketSignals(socket_.get());
|
||
|
|
} else {
|
||
|
|
LOG_J(LS_WARNING, this) << "Failed to create connection to "
|
||
|
|
<< remote_candidate().address().ToSensitiveString();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void TCPConnection::ConnectSocketSignals(rtc::AsyncPacketSocket* socket) {
|
||
|
|
if (outgoing_) {
|
||
|
|
socket->SignalConnect.connect(this, &TCPConnection::OnConnect);
|
||
|
|
}
|
||
|
|
socket->SignalReadPacket.connect(this, &TCPConnection::OnReadPacket);
|
||
|
|
socket->SignalReadyToSend.connect(this, &TCPConnection::OnReadyToSend);
|
||
|
|
socket->SignalClose.connect(this, &TCPConnection::OnClose);
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace cricket
|