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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.
- #ifndef NET_SOCKET_SOCKS5_CLIENT_SOCKET_H_
- #define NET_SOCKET_SOCKS5_CLIENT_SOCKET_H_
- #include <stddef.h>
- #include <stdint.h>
- #include <memory>
- #include <string>
- #include "base/memory/ref_counted.h"
- #include "net/base/address_list.h"
- #include "net/base/completion_once_callback.h"
- #include "net/base/completion_repeating_callback.h"
- #include "net/base/host_port_pair.h"
- #include "net/base/net_errors.h"
- #include "net/base/net_export.h"
- #include "net/log/net_log_with_source.h"
- #include "net/socket/stream_socket.h"
- #include "net/traffic_annotation/network_traffic_annotation.h"
- #include "url/gurl.h"
- namespace net {
- // This StreamSocket is used to setup a SOCKSv5 handshake with a socks proxy.
- // Currently no SOCKSv5 authentication is supported.
- class NET_EXPORT_PRIVATE SOCKS5ClientSocket : public StreamSocket {
- public:
- // |destination| contains the hostname and port to which the socket above will
- // communicate to via the SOCKS layer.
- //
- // Although SOCKS 5 supports 3 different modes of addressing, we will
- // always pass it a hostname. This means the DNS resolving is done
- // proxy side.
- SOCKS5ClientSocket(std::unique_ptr<StreamSocket> transport_socket,
- const HostPortPair& destination,
- const NetworkTrafficAnnotationTag& traffic_annotation);
- SOCKS5ClientSocket(const SOCKS5ClientSocket&) = delete;
- SOCKS5ClientSocket& operator=(const SOCKS5ClientSocket&) = delete;
- // On destruction Disconnect() is called.
- ~SOCKS5ClientSocket() override;
- // StreamSocket implementation.
- // Does the SOCKS handshake and completes the protocol.
- int Connect(CompletionOnceCallback callback) override;
- void Disconnect() override;
- bool IsConnected() const override;
- bool IsConnectedAndIdle() const override;
- const NetLogWithSource& NetLog() const override;
- bool WasEverUsed() const override;
- bool WasAlpnNegotiated() const override;
- NextProto GetNegotiatedProtocol() const override;
- bool GetSSLInfo(SSLInfo* ssl_info) override;
- int64_t GetTotalReceivedBytes() const override;
- void ApplySocketTag(const SocketTag& tag) override;
- // Socket implementation.
- int Read(IOBuffer* buf,
- int buf_len,
- CompletionOnceCallback callback) override;
- int Write(IOBuffer* buf,
- int buf_len,
- CompletionOnceCallback callback,
- const NetworkTrafficAnnotationTag& traffic_annotation) override;
- int SetReceiveBufferSize(int32_t size) override;
- int SetSendBufferSize(int32_t size) override;
- int GetPeerAddress(IPEndPoint* address) const override;
- int GetLocalAddress(IPEndPoint* address) const override;
- private:
- enum State {
- STATE_GREET_WRITE,
- STATE_GREET_WRITE_COMPLETE,
- STATE_GREET_READ,
- STATE_GREET_READ_COMPLETE,
- STATE_HANDSHAKE_WRITE,
- STATE_HANDSHAKE_WRITE_COMPLETE,
- STATE_HANDSHAKE_READ,
- STATE_HANDSHAKE_READ_COMPLETE,
- STATE_NONE,
- };
- // Addressing type that can be specified in requests or responses.
- enum SocksEndPointAddressType {
- kEndPointDomain = 0x03,
- kEndPointResolvedIPv4 = 0x01,
- kEndPointResolvedIPv6 = 0x04,
- };
- static const unsigned int kGreetReadHeaderSize;
- static const unsigned int kWriteHeaderSize;
- static const unsigned int kReadHeaderSize;
- static const uint8_t kSOCKS5Version;
- static const uint8_t kTunnelCommand;
- static const uint8_t kNullByte;
- void DoCallback(int result);
- void OnIOComplete(int result);
- void OnReadWriteComplete(CompletionOnceCallback callback, int result);
- int DoLoop(int last_io_result);
- int DoHandshakeRead();
- int DoHandshakeReadComplete(int result);
- int DoHandshakeWrite();
- int DoHandshakeWriteComplete(int result);
- int DoGreetRead();
- int DoGreetReadComplete(int result);
- int DoGreetWrite();
- int DoGreetWriteComplete(int result);
- // Writes the SOCKS handshake buffer into |handshake|
- // and return OK on success.
- int BuildHandshakeWriteBuffer(std::string* handshake) const;
- CompletionRepeatingCallback io_callback_;
- // Stores the underlying socket.
- std::unique_ptr<StreamSocket> transport_socket_;
- State next_state_ = STATE_NONE;
- // Stores the callback to the layer above, called on completing Connect().
- CompletionOnceCallback user_callback_;
- // This IOBuffer is used by the class to read and write
- // SOCKS handshake data. The length contains the expected size to
- // read or write.
- scoped_refptr<IOBuffer> handshake_buf_;
- // While writing, this buffer stores the complete write handshake data.
- // While reading, it stores the handshake information received so far.
- std::string buffer_;
- // This becomes true when the SOCKS handshake has completed and the
- // overlying connection is free to communicate.
- bool completed_handshake_ = false;
- // These contain the bytes sent / received by the SOCKS handshake.
- size_t bytes_sent_ = 0;
- size_t bytes_received_ = 0;
- size_t read_header_size;
- bool was_ever_used_ = false;
- const HostPortPair destination_;
- NetLogWithSource net_log_;
- // Traffic annotation for socket control.
- NetworkTrafficAnnotationTag traffic_annotation_;
- };
- } // namespace net
- #endif // NET_SOCKET_SOCKS5_CLIENT_SOCKET_H_
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