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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.
// An implementation of jingle_xmpp::AsyncSocket that uses Chrome Network Service
// sockets.
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "jingle/glue/network_service_config.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "mojo/public/cpp/system/simple_watcher.h"
#include "net/base/host_port_pair.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
#include "services/network/public/mojom/proxy_resolving_socket.mojom.h"
#include "services/network/public/mojom/tcp_socket.mojom.h"
#include "services/network/public/mojom/tls_socket.mojom.h"
#include "third_party/libjingle_xmpp/xmpp/asyncsocket.h"
namespace jingle_glue {
class NetworkServiceAsyncSocket : public jingle_xmpp::AsyncSocket,
public network::mojom::SocketObserver {
GetProxyResolvingSocketFactoryCallback get_socket_factory_callback,
bool use_fake_tls_handshake,
size_t read_buf_size,
size_t write_buf_size,
const net::NetworkTrafficAnnotationTag& traffic_annotation);
// Does not raise any signals.
~NetworkServiceAsyncSocket() override;
// jingle_xmpp::AsyncSocket implementation.
// The current state (see jingle_xmpp::AsyncSocket::State; all but
// STATE_CLOSING is used).
State state() override;
// The last generated error. Errors are generated when the main
// functions below return false or when SignalClosed is raised due
// to an asynchronous error.
Error error() override;
// GetError() (which is of type net::Error) != net::OK only when
// error() == ERROR_WINSOCK.
int GetError() override;
// Tries to connect to the given address.
// If state() is not STATE_CLOSED, sets error to ERROR_WRONGSTATE
// and returns false.
// If |address| has an empty hostname or a zero port, sets error to
// ERROR_DNS and returns false. (We don't use the IP address even
// if it's present, as DNS resolution is done by the network service).
// But it's perfectly fine if the hostname is a stringified IP address.)
// Otherwise, starts the connection process and returns true.
// SignalConnected will be raised when the connection is successful;
// otherwise, SignalClosed will be raised with a net error set.
bool Connect(const net::HostPortPair& address) override;
// Tries to read at most |len| bytes into |data|.
// If state() is not STATE_TLS_CONNECTING, STATE_OPEN, or
// STATE_TLS_OPEN, sets error to ERROR_WRONGSTATE and returns false.
// Otherwise, fills in |len_read| with the number of bytes read and
// returns true. If this is called when state() is
// STATE_TLS_CONNECTING, reads 0 bytes. (We have to handle this
// case because StartTls() is called during a slot connected to
// SignalRead after parsing the final non-TLS reply from the server
// [see XmppClient::Private::OnSocketRead()].)
bool Read(char* data, size_t len, size_t* len_read) override;
// Queues up |len| bytes of |data| for writing.
// If state() is not STATE_TLS_CONNECTING, STATE_OPEN, or
// STATE_TLS_OPEN, sets error to ERROR_WRONGSTATE and returns false.
// If the given data is too big for the internal write buffer, sets
// returns false.
// Otherwise, queues up the data and returns true. If this is
// called when state() == STATE_TLS_CONNECTING, the data is will be
// sent only after the TLS connection succeeds. (See StartTls()
// below for why this happens.)
// Note that there's no guarantee that the data will actually be
// sent; however, it is guaranteed that the any data sent will be
// sent in FIFO order.
bool Write(const char* data, size_t len) override;
// If the socket is not already closed, closes the socket and raises
// SignalClosed. Always returns true.
bool Close() override;
// Tries to change to a TLS connection with the given domain name.
// If state() is not STATE_OPEN or there are pending reads or
// writes, sets error to ERROR_WRONGSTATE and returns false. (In
// practice, this means that StartTls() can only be called from a
// slot connected to SignalRead.)
// Otherwise, starts the TLS connection process and returns true.
// SignalSSLConnected will be raised when the connection is
// successful; otherwise, SignalClosed will be raised with a net
// error set.
bool StartTls(const std::string& domain_name) override;
// Signal behavior:
// SignalConnected: raised whenever the connect initiated by a call
// to Connect() is complete.
// SignalSSLConnected: raised whenever the connect initiated by a
// call to StartTls() is complete. Not actually used by
// XmppClient. (It just assumes that if SignalRead is raised after a
// call to StartTls(), the connection has been successfully
// upgraded.)
// SignalClosed: raised whenever the socket is closed, either due to
// an asynchronous error, the other side closing the connection, or
// when Close() is called.
// SignalRead: raised whenever the next call to Read() will succeed
// with a non-zero |len_read| (assuming nothing else happens in the
// meantime).
// SignalError: not used.
enum AsyncIOState {
// An I/O op is not in progress or has been handed over to the network
// service.
// Waiting for network service to be ready to handle an operation.
bool IsOpen() const;
// Error functions.
void DoNonNetError(Error error);
void DoNetError(net::Error net_error);
void DoNetErrorFromStatus(int status);
void ProcessSocketObserverError();
// SocketObserver implementation
void OnReadError(int32_t net_error) override;
void OnWriteError(int32_t net_error) override;
// Connection functions.
void ProcessConnectDone(
network::mojom::SocketObserverRequest socket_observer_request,
int status,
const base::Optional<net::IPEndPoint>& local_addr,
const base::Optional<net::IPEndPoint>& peer_addr,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream);
// Read loop functions.
void WatchForReadReady();
void ProcessReadReady(MojoResult result,
const mojo::HandleSignalsState& state);
void ReportReadError(int net_error);
// Write loop functions.
void WatchForWriteReady();
void ProcessWriteReady(MojoResult result,
const mojo::HandleSignalsState& state);
void ProcessWriteClosed(MojoResult result,
const mojo::HandleSignalsState& state);
// SSL/TLS connection functions.
void ProcessSSLConnectDone(
network::mojom::SocketObserverRequest socket_observer_request,
int status,
mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream);
// Close functions.
void DoClose();
void ConnectPipes(mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream);
void BindSocketObserver(
network::mojom::SocketObserverRequest socket_observer_request);
// |socket_factory_| is recreated every time via |get_socket_factory_callback|
// to handle network service restarts after crashes.
GetProxyResolvingSocketFactoryCallback get_socket_factory_callback_;
network::mojom::ProxyResolvingSocketFactoryPtr socket_factory_;
// The handle to the proxy resolving socket for the current connection, if one
// exists.
network::mojom::ProxyResolvingSocketPtr socket_;
// TLS socket, if StartTls has been called.
network::mojom::TLSClientSocketPtr tls_socket_;
// Used to route error notifications here.
mojo::Binding<network::mojom::SocketObserver> socket_observer_binding_;
bool use_fake_tls_handshake_;
// jingle_xmpp::AsyncSocket state.
jingle_xmpp::AsyncSocket::State state_;
jingle_xmpp::AsyncSocket::Error error_;
net::Error net_error_;
// State for the read loop. |read_start_| <= |read_end_| <=
// |read_buf_->size()|. There's a read in flight (i.e.,
// |read_state_| != IDLE) iff |read_end_| == 0.
AsyncIOState read_state_;
std::vector<char> read_buf_;
size_t read_start_, read_end_;
mojo::ScopedDataPipeConsumerHandle read_pipe_;
std::unique_ptr<mojo::SimpleWatcher> read_watcher_;
// Handling read errors is a bit tricky since the status is reported via
// |socket_observer_binding_|, which is unordered compared to |read_pipe_|,
// so it's possible to see an end of file (or an error) there while there is
// still useful data pending. As a result, the code waits to see both happen
// before reporting error statuses (including EOF). Likewise for write pipes.
bool saw_error_on_read_pipe_;
bool saw_error_on_write_pipe_;
// This is != net::ERR_IO_PENDING (including possibly net::OK for end-of-file)
// if a read error was reported via socket observer interface.
int saw_read_error_on_socket_observer_pipe_;
int saw_write_error_on_socket_observer_pipe_;
// State for the write loop. |write_end_| <= |write_buf_->size()|.
// There's a write in flight (i.e., |write_state_| != IDLE) iff
// |write_end_| > 0.
AsyncIOState write_state_;
std::vector<char> write_buf_;
size_t write_end_;
mojo::ScopedDataPipeProducerHandle write_pipe_;
std::unique_ptr<mojo::SimpleWatcher> write_watcher_;
std::unique_ptr<mojo::SimpleWatcher> write_close_watcher_;
// Network traffic annotation for downstream socket write.
// NetworkServiceAsyncSocket is not reused, hence annotation can be added in
// constructor and used in all subsequent writes.
const net::NetworkTrafficAnnotationTag traffic_annotation_;
} // namespace jingle_glue