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CommunicationChannels.pas
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// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
unit
CommunicationChannels;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
interface
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
Configuration,
DnsProtocol,
IPUtils;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TCommunicationChannel = class
public
class procedure Initialize;
class procedure Finalize;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TIPv4UdpCommunicationChannel = class
private
IPv4UdpSocketHandle: Integer;
public
constructor Create;
procedure Bind(BindingAddress: TIPv4Address); overload;
procedure Bind(BindingAddress: TIPv4Address; BindingPort: Word); overload;
procedure Send(Buffer: Pointer; BufferLen: Integer; DestinationAddress: TIPv4Address; DestinationPort: Word);
function Receive(Timeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer; var RemoteAddress: TIPv4Address; var RemotePort: Word): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TIPv6UdpCommunicationChannel = class
private
IPv6UdpSocketHandle: Integer;
public
constructor Create;
procedure Bind(BindingAddress: TIPv6Address); overload;
procedure Bind(BindingAddress: TIPv6Address; BindingPort: Word); overload;
procedure Send(Buffer: Pointer; BufferLen: Integer; DestinationAddress: TIPv6Address; DestinationPort: Word);
function Receive(Timeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer; var RemoteAddress: TIPv6Address; var RemotePort: Word): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TIPv4TcpCommunicationChannel = class
private
IPv4TcpSocketHandle: Integer;
public
IsConnected: Boolean;
public
RemoteAddress: TIPv4Address;
RemotePort: Word;
public
constructor Create; overload;
constructor Create(IPv4TcpSocketHandle: Integer; RemoteAddress: TIPv4Address; RemotePort: Word); overload;
procedure Bind(BindingAddress: TIPv4Address; BindingPort: Word);
function Listen: TIPv4TcpCommunicationChannel;
procedure Connect(RemoteAddress: TIPv4Address; RemotePort: Word);
procedure Send(Buffer: Pointer; BufferLen: Integer);
function Receive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer): Boolean;
function PerformSocks5Handshake(ProxyFirstByteTimeout: Integer; ProxyOtherBytesTimeout: Integer; ProxyRemoteConnectTimeout: Integer; RemoteAddress: TDualIPAddress; RemotePort: Word): Boolean;
destructor Destroy; override;
private
procedure InternalSend(Buffer: Pointer; BufferLen: Integer);
procedure InternalSendContinue(Buffer: Pointer; BufferLen: Integer; BytesSent: Integer);
function InternalReceive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer): Boolean;
function InternalReceiveContinue(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer; BytesReceived: Integer): Boolean;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TIPv6TcpCommunicationChannel = class
private
IPv6TcpSocketHandle: Integer;
public
IsConnected: Boolean;
public
RemoteAddress: TIpv6Address;
RemotePort: Word;
public
constructor Create; overload;
constructor Create(IPv6TcpSocketHandle: Integer; RemoteAddress: TIPv6Address; RemotePort: Word); overload;
procedure Bind(BindingAddress: TIPv6Address; BindingPort: Word);
function Listen: TIPv6TcpCommunicationChannel;
procedure Connect(RemoteAddress: TIPv6Address; RemotePort: Word);
procedure Send(Buffer: Pointer; BufferLen: Integer);
function Receive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer): Boolean;
function PerformSocks5Handshake(ProxyFirstByteTimeout: Integer; ProxyOtherBytesTimeout: Integer; ProxyRemoteConnectTimeout: Integer; RemoteAddress: TDualIPAddress; RemotePort: Word): Boolean;
destructor Destroy; override;
private
procedure InternalSend(Buffer: Pointer; BufferLen: Integer);
procedure InternalSendContinue(Buffer: Pointer; BufferLen: Integer; BytesSent: Integer);
function InternalReceive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer): Boolean;
function InternalReceiveContinue(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer; BytesReceived: Integer): Boolean;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
type
TDnsOverHttpsCommunicationChannel = class
public
constructor Create;
function SendAndReceiveUsingWinInet(RequestBuffer: Pointer; RequestBufferLen: Integer; const DestinationAddress: String; DestinationPort: Word; const DestinationPath: String; const DestinationHost: String; ConnectionType: TDnsOverHttpsProtocolConnectionType; ReuseConnections: Boolean; ResponseTimeout: Integer; MaxResponseBufferLen: Integer; var ResponseBuffer: Pointer; var ResponseBufferLen: Integer): Boolean;
function SendAndReceiveUsingWinHttp(RequestBuffer: Pointer; RequestBufferLen: Integer; const DestinationAddress: String; DestinationPort: Word; const DestinationPath: String; const DestinationHost: String; ConnectionType: TDnsOverHttpsProtocolConnectionType; ReuseConnections: Boolean; ResponseTimeout: Integer; MaxResponseBufferLen: Integer; var ResponseBuffer: Pointer; var ResponseBufferLen: Integer): Boolean;
destructor Destroy; override;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
implementation
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
uses
SysUtils,
WinInet,
AcrylicVersionInfo,
WinHttp,
WinSock;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TCommunicationChannel.Initialize;
var
WSAData: TWSAData;
begin
WSAStartup(WINDOWS_SOCKETS_VERSION, WSAData);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
class procedure TCommunicationChannel.Finalize;
begin
WSACleanup;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv4UdpCommunicationChannel.Create;
begin
Self.IPv4UdpSocketHandle := INVALID_SOCKET;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4UdpCommunicationChannel.Bind(BindingAddress: TIPv4Address);
var
IPv4SocketAddress: TIPv4SocketAddress;
begin
Self.IPv4UdpSocketHandle := Socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if not(IsValidSocketHandle(Self.IPv4UdpSocketHandle)) then raise Exception.Create('TIPv4UdpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv4SocketAddress, SizeOf(TIPv4SocketAddress), 0);
IPv4SocketAddress.sin_family := AF_INET; IPv4SocketAddress.sin_addr := BindingAddress;
if not(IsValidSocketResult(IPv4Bind(Self.IPv4UdpSocketHandle, IPv4SocketAddress, SizeOf(TIPv4SocketAddress)))) then raise Exception.Create('TIPv4UdpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4UdpCommunicationChannel.Bind(BindingAddress: TIPv4Address; BindingPort: Word);
var
IPv4SocketAddress: TIPv4SocketAddress;
begin
Self.IPv4UdpSocketHandle := Socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if not(IsValidSocketHandle(Self.IPv4UdpSocketHandle)) then raise Exception.Create('TIPv4UdpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv4SocketAddress, SizeOf(TIPv4SocketAddress), 0);
IPv4SocketAddress.sin_family := AF_INET; IPv4SocketAddress.sin_addr := BindingAddress; IPv4SocketAddress.sin_port := HTONS(BindingPort);
if not(IsValidSocketResult(IPv4Bind(Self.IPv4UdpSocketHandle, IPv4SocketAddress, SizeOf(TIPv4SocketAddress)))) then raise Exception.Create('TIPv4UdpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4UdpCommunicationChannel.Send(Buffer: Pointer; BufferLen: Integer; DestinationAddress: TIPv4Address; DestinationPort: Word);
var
IPv4SocketAddress: TIPv4SocketAddress;
begin
FillChar(IPv4SocketAddress, SizeOf(TIPv4SocketAddress), 0);
IPv4SocketAddress.sin_family := AF_INET; IPv4SocketAddress.sin_addr := DestinationAddress; IPv4SocketAddress.sin_port := HTONS(DestinationPort);
if not(IsValidSocketResult(IPv4SendTo(Self.IPv4UdpSocketHandle, Buffer^, BufferLen, 0, IPv4SocketAddress, SizeOf(TIPv4SocketAddress)))) then raise Exception.Create('TIPv4UdpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4UdpCommunicationChannel.Receive(Timeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer; var RemoteAddress: TIPv4Address; var RemotePort: Word): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; IPv4SocketAddress: TIPv4SocketAddress; IPv4SocketAddressSize: Integer;
begin
Result := False;
TimeVal.tv_sec := Timeout div 1000;
TimeVal.tv_usec := 1000 * (Timeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv4UdpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv4UdpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
IPv4SocketAddressSize := SizeOf(TIPv4SocketAddress); BufferLen := IPv4RecvFrom(Self.IPv4UdpSocketHandle, Buffer^, MaxBufferLen, 0, IPv4SocketAddress, IPv4SocketAddressSize);
if (BufferLen > 0) then begin
RemoteAddress := IPv4SocketAddress.sin_addr; RemotePort := HTONS(IPv4SocketAddress.sin_port); Result := True; Exit;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TIPv4UdpCommunicationChannel.Destroy;
begin
if IsValidSocketHandle(Self.IPv4UdpSocketHandle) then CloseSocket(Self.IPv4UdpSocketHandle);
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv6UdpCommunicationChannel.Create;
begin
Self.IPv6UdpSocketHandle := INVALID_SOCKET;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6UdpCommunicationChannel.Bind(BindingAddress: TIPv6Address);
var
IPv6SocketAddress: TIPv6SocketAddress;
begin
Self.IPv6UdpSocketHandle := Socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if not(IsValidSocketHandle(Self.IPv6UdpSocketHandle)) then raise Exception.Create('TIPv6UdpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv6SocketAddress, SizeOf(TIPv6SocketAddress), 0);
IPv6SocketAddress.sin_family := AF_INET6; IPv6SocketAddress.sin_addr := BindingAddress;
if not(IsValidSocketResult(IPv6Bind(Self.IPv6UdpSocketHandle, IPv6SocketAddress, SizeOf(TIPv6SocketAddress)))) then raise Exception.Create('TIPv6UdpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6UdpCommunicationChannel.Bind(BindingAddress: TIPv6Address; BindingPort: Word);
var
IPv6SocketAddress: TIPv6SocketAddress;
begin
Self.IPv6UdpSocketHandle := Socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if not(IsValidSocketHandle(Self.IPv6UdpSocketHandle)) then raise Exception.Create('TIPv6UdpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv6SocketAddress, SizeOf(TIPv6SocketAddress), 0);
IPv6SocketAddress.sin_family := AF_INET6; IPv6SocketAddress.sin_addr := BindingAddress; IPv6SocketAddress.sin_port := HTONS(BindingPort);
if not(IsValidSocketResult(IPv6Bind(Self.IPv6UdpSocketHandle, IPv6SocketAddress, SizeOf(TIPv6SocketAddress)))) then raise Exception.Create('TIPv6UdpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6UdpCommunicationChannel.Send(Buffer: Pointer; BufferLen: Integer; DestinationAddress: TIPv6Address; DestinationPort: Word);
var
IPv6SocketAddress: TIPv6SocketAddress;
begin
FillChar(IPv6SocketAddress, SizeOf(TIPv6SocketAddress), 0);
IPv6SocketAddress.sin_family := AF_INET6; IPv6SocketAddress.sin_addr := DestinationAddress; IPv6SocketAddress.sin_port := HTONS(DestinationPort);
if not(IsValidSocketResult(IPv6SendTo(Self.IPv6UdpSocketHandle, Buffer^, BufferLen, 0, IPv6SocketAddress, SizeOf(TIPv6SocketAddress)))) then raise Exception.Create('TIPv6UdpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv6UdpCommunicationChannel.Receive(Timeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer; var RemoteAddress: TIPv6Address; var RemotePort: Word): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; IPv6SocketAddress: TIPv6SocketAddress; IPv6SocketAddressSize: Integer;
begin
Result := False;
TimeVal.tv_sec := Timeout div 1000;
TimeVal.tv_usec := 1000 * (Timeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv6UdpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv6UdpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
IPv6SocketAddressSize := SizeOf(TIPv6SocketAddress); BufferLen := IPv6RecvFrom(Self.IPv6UdpSocketHandle, Buffer^, MaxBufferLen, 0, IPv6SocketAddress, IPv6SocketAddressSize);
if (BufferLen > 0) then begin
RemoteAddress := IPv6SocketAddress.sin_addr; RemotePort := HTONS(IPv6SocketAddress.sin_port); Result := True; Exit;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TIPv6UdpCommunicationChannel.Destroy;
begin
if IsValidSocketHandle(Self.IPv6UdpSocketHandle) then CloseSocket(Self.IPv6UdpSocketHandle);
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv4TcpCommunicationChannel.Create;
begin
Self.IPv4TcpSocketHandle := INVALID_SOCKET;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv4TcpCommunicationChannel.Create(IPv4TcpSocketHandle: Integer; RemoteAddress: TIPv4Address; RemotePort: Word);
begin
Self.IPv4TcpSocketHandle := IPv4TcpSocketHandle;
Self.RemoteAddress := RemoteAddress; Self.RemotePort := RemotePort; Self.IsConnected := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4TcpCommunicationChannel.Bind(BindingAddress: TIPv4Address; BindingPort: Word);
var
IPv4SocketAddress: TIPv4SocketAddress;
begin
Self.IPv4TcpSocketHandle := Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if not(IsValidSocketHandle(Self.IPv4TcpSocketHandle)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv4SocketAddress, SizeOf(TIPv4SocketAddress), 0);
IPv4SocketAddress.sin_family := AF_INET; IPv4SocketAddress.sin_addr := BindingAddress; IPv4SocketAddress.sin_port := HTONS(BindingPort);
if not(IsValidSocketResult(IPv4Bind(Self.IPv4TcpSocketHandle, IPv4SocketAddress, SizeOf(TIPv4SocketAddress)))) then raise Exception.Create('TIPv4TcpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4TcpCommunicationChannel.Listen: TIPv4TcpCommunicationChannel;
var
IPv4TcpSessionSocketHandle: Integer; IPv4SocketAddress: TIPv4SocketAddress; IPv4SocketAddressSize: Integer;
begin
if (IPv4Listen(Self.IPv4TcpSocketHandle, 200) = 0) then begin
IPv4SocketAddressSize := SizeOf(TIPv4SocketAddress); IPv4TcpSessionSocketHandle := IPv4Accept(Self.IPv4TcpSocketHandle, IPv4SocketAddress, IPv4SocketAddressSize); if IsValidSocketHandle(IPv4TcpSessionSocketHandle) then begin
Result := TIPv4TcpCommunicationChannel.Create(IPv4TcpSessionSocketHandle, IPv4SocketAddress.sin_addr, HTONS(IPv4SocketAddress.sin_port)); Exit;
end;
end;
Result := nil;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4TcpCommunicationChannel.Connect(RemoteAddress: TIPv4Address; RemotePort: Word);
var
IPv4SocketAddress: TIPv4SocketAddress;
begin
Self.IPv4TcpSocketHandle := Socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if not(IsValidSocketHandle(Self.IPv4TcpSocketHandle)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Connect: Socket allocation failed.');
FillChar(IPv4SocketAddress, SizeOf(TIPv4SocketAddress), 0);
IPv4SocketAddress.sin_family := AF_INET; IPv4SocketAddress.sin_addr := RemoteAddress; IPv4SocketAddress.sin_port := HTONS(RemotePort);
if not(IsValidSocketResult(IPv4Connect(Self.IPv4TcpSocketHandle, IPv4SocketAddress, SizeOf(TIPv4SocketAddress)))) then raise Exception.Create('TIPv4TcpCommunicationChannel.Connect: Connect to address ' + TIPv4AddressUtility.ToString(RemoteAddress) + ' and port ' + IntToStr(RemotePort) + ' failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
Self.RemoteAddress := RemoteAddress; Self.RemotePort := RemotePort; Self.IsConnected := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4TcpCommunicationChannel.Send(Buffer: Pointer; BufferLen: Integer);
var
DnsPacketLen: Word;
begin
DnsPacketLen := HTONS(Word(BufferLen)); Self.InternalSend(@DnsPacketLen, SizeOf(Word)); Self.InternalSend(Buffer, BufferLen);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4TcpCommunicationChannel.InternalSend(Buffer: Pointer; BufferLen: Integer);
var
IPv4SendResult: Integer;
begin
IPv4SendResult := IPv4Send(Self.IPv4TcpSocketHandle, Buffer^, BufferLen, 0); if not(IsValidSocketResult(IPv4SendResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4SendResult = 0) then raise Exception.Create('TIPv4TcpCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.'); if (IPv4SendResult < BufferLen) then Self.InternalSendContinue(Buffer, BufferLen, IPv4SendResult);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv4TcpCommunicationChannel.InternalSendContinue(Buffer: Pointer; BufferLen: Integer; BytesSent: Integer);
var
BytesRemaining: Integer; IPv4SendResult: Integer;
begin
BytesRemaining := BufferLen - BytesSent; IPv4SendResult := IPv4Send(Self.IPv4TcpSocketHandle, Pointer(Integer(Buffer) + BytesSent)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv4SendResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4SendResult = 0) then raise Exception.Create('TIPv4TcpClientCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.'); while (IPv4SendResult < BytesRemaining) do begin
BytesSent := BytesSent + IPv4SendResult; BytesRemaining := BytesRemaining - IPv4SendResult; IPv4SendResult := IPv4Send(Self.IPv4TcpSocketHandle, Pointer(Integer(Buffer) + BytesSent)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv4SendResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4SendResult = 0) then raise Exception.Create('TIPv4TcpCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4TcpCommunicationChannel.Receive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer): Boolean;
var
DnsPacketLen: Word;
begin
Result := False;
if Self.InternalReceive(FirstByteTimeout, OtherBytesTimeout, @DnsPacketLen, SizeOf(Word)) then begin
DnsPacketLen := HTONS(DnsPacketLen); if (DnsPacketLen > MaxBufferLen) then DnsPacketLen := MaxBufferLen;
if Self.InternalReceive(OtherBytesTimeout, OtherBytesTimeout, Buffer, DnsPacketLen) then begin
BufferLen := DnsPacketLen; Result := True;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4TcpCommunicationChannel.InternalReceive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; IPv4RecvResult: Integer;
begin
Result := False;
TimeVal.tv_sec := FirstByteTimeout div 1000;
TimeVal.tv_usec := 1000 * (FirstByteTimeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv4TcpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
IPv4RecvResult := IPv4Recv(Self.IPv4TcpSocketHandle, Buffer^, BufferLen, 0); if not(IsValidSocketResult(IPv4RecvResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4RecvResult = 0) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.'); if (IPv4RecvResult < BufferLen) then Result := Self.InternalReceiveContinue(FirstByteTimeout, OtherBytesTimeout, Buffer, BufferLen, IPv4RecvResult) else Result := True;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4TcpCommunicationChannel.InternalReceiveContinue(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer; BytesReceived: Integer): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; BytesRemaining: Integer; IPv4RecvResult: Integer;
begin
Result := False;
TimeVal.tv_sec := OtherBytesTimeout div 1000;
TimeVal.tv_usec := 1000 * (OtherBytesTimeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv4TcpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
BytesRemaining := BufferLen - BytesReceived; IPv4RecvResult := IPv4Recv(Self.IPv4TcpSocketHandle, Pointer(Integer(Buffer) + BytesReceived)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv4RecvResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4RecvResult = 0) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.'); while (IPv4RecvResult < BytesRemaining) do begin
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
BytesReceived := BytesReceived + IPv4RecvResult; BytesRemaining := BytesRemaining - IPv4RecvResult; IPv4RecvResult := IPv4Recv(Self.IPv4TcpSocketHandle, Pointer(Integer(Buffer) + BytesReceived)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv4RecvResult)) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv4RecvResult = 0) then raise Exception.Create('TIPv4TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.');
end else begin
Exit;
end;
end;
Result := True;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv4TcpCommunicationChannel.PerformSocks5Handshake(ProxyFirstByteTimeout: Integer; ProxyOtherBytesTimeout: Integer; ProxyRemoteConnectTimeout: Integer; RemoteAddress: TDualIPAddress; RemotePort: Word): Boolean;
var
Socks5Buffer: Array [0..1023] of Byte;
begin
Socks5Buffer[00] := $05;
Socks5Buffer[01] := $01;
Socks5Buffer[02] := $00;
Self.InternalSend(@Socks5Buffer, 3); if Self.InternalReceive(ProxyFirstByteTimeout, ProxyOtherBytesTimeout, @Socks5Buffer, 2) then begin
if RemoteAddress.IsIPv6Address then begin
Socks5Buffer[00] := $05;
Socks5Buffer[01] := $01;
Socks5Buffer[02] := $00;
Socks5Buffer[03] := $04;
Move(RemoteAddress.IPv6Address, Socks5Buffer[04], SizeOf(TIPv6Address));
Socks5Buffer[20] := RemotePort shr $08;
Socks5Buffer[21] := RemotePort and $ff;
Self.InternalSend(@Socks5Buffer, 22); if Self.InternalReceive(ProxyRemoteConnectTimeout, ProxyOtherBytesTimeout, @Socks5Buffer, 22) then begin
if (Socks5Buffer[01] <> 0) then begin
raise Exception.Create('TIPv4TcpCommunicationChannel.PerformSocks5Handshake: Handshake failed on phase 3 with reply ' + IntToStr(Socks5Buffer[01]) + '.');
end;
Result := True;
end else begin
raise Exception.Create('TIPv4TcpCommunicationChannel.PerformSocks5Handshake: Handshake failed on phase 2.');
end;
end else begin
Socks5Buffer[00] := $05;
Socks5Buffer[01] := $01;
Socks5Buffer[02] := $00;
Socks5Buffer[03] := $01;
Move(RemoteAddress.IPv4Address, Socks5Buffer[04], SizeOf(TIPv4Address));
Socks5Buffer[08] := RemotePort shr $08;
Socks5Buffer[09] := RemotePort and $ff;
Self.InternalSend(@Socks5Buffer, 10);
if Self.InternalReceive(ProxyRemoteConnectTimeout, ProxyOtherBytesTimeout, @Socks5Buffer, 10) then begin
if (Socks5Buffer[01] <> 0) then begin
raise Exception.Create('TIPv4TcpCommunicationChannel.PerformSocks5Handshake: Handshake failed on phase 3 with reply ' + IntToStr(Socks5Buffer[01]) + '.');
end;
Result := True;
end else begin
raise Exception.Create('TIPv4TcpCommunicationChannel.PerformSocks5Handshake: Handshake failed on phase 2.');
end;
end;
end else begin
raise Exception.Create('TIPv4TcpCommunicationChannel.PerformSocks5Handshake: Handshake failed on phase 1.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
destructor TIPv4TcpCommunicationChannel.Destroy;
begin
if IsValidSocketHandle(Self.IPv4TcpSocketHandle) then begin if Self.IsConnected then IPv4Shutdown(Self.IPv4TcpSocketHandle, 2); CloseSocket(Self.IPv4TcpSocketHandle); end;
inherited Destroy;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv6TcpCommunicationChannel.Create;
begin
Self.IPv6TcpSocketHandle := INVALID_SOCKET;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
constructor TIPv6TcpCommunicationChannel.Create(IPv6TcpSocketHandle: Integer; RemoteAddress: TIPv6Address; RemotePort: Word);
begin
Self.IPv6TcpSocketHandle := IPv6TcpSocketHandle;
Self.RemoteAddress := RemoteAddress; Self.RemotePort := RemotePort; Self.IsConnected := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6TcpCommunicationChannel.Bind(BindingAddress: TIPv6Address; BindingPort: Word);
var
IPv6SocketAddress: TIPv6SocketAddress;
begin
Self.IPv6TcpSocketHandle := Socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
if not(IsValidSocketHandle(Self.IPv6TcpSocketHandle)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Bind: Socket allocation failed.');
FillChar(IPv6SocketAddress, SizeOf(IPv6SocketAddress), 0);
IPv6SocketAddress.sin_family := AF_INET6; IPv6SocketAddress.sin_addr := BindingAddress; IPv6SocketAddress.sin_port := HTONS(BindingPort);
if not(IsValidSocketResult(IPv6Bind(Self.IPv6TcpSocketHandle, IPv6SocketAddress, SizeOf(TIPv6SocketAddress)))) then raise Exception.Create('TIPv6TcpCommunicationChannel.Bind: Bind failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv6TcpCommunicationChannel.Listen: TIPv6TcpCommunicationChannel;
var
IPv6TcpChildSocketHandle: Integer; IPv6SocketAddress: TIPv6SocketAddress; IPv6SocketAddressSize: Integer;
begin
if (IPv6Listen(Self.IPv6TcpSocketHandle, 200) = 0) then begin
IPv6SocketAddressSize := SizeOf(TIPv6SocketAddress); IPv6TcpChildSocketHandle := IPv6Accept(Self.IPv6TcpSocketHandle, IPv6SocketAddress, IPv6SocketAddressSize); if IsValidSocketHandle(IPv6TcpChildSocketHandle) then begin
Result := TIPv6TcpCommunicationChannel.Create(IPv6TcpChildSocketHandle, IPv6SocketAddress.sin_addr, HTONS(IPv6SocketAddress.sin_port)); Exit;
end;
end;
Result := nil;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6TcpCommunicationChannel.Connect(RemoteAddress: TIPv6Address; RemotePort: Word);
var
IPv6SocketAddress: TIPv6SocketAddress;
begin
Self.IPv6TcpSocketHandle := Socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
if not(IsValidSocketHandle(Self.IPv6TcpSocketHandle)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Create: Socket allocation failed.');
FillChar(IPv6SocketAddress, SizeOf(TIPv6SocketAddress), 0);
IPv6SocketAddress.sin_family := AF_INET6; IPv6SocketAddress.sin_addr := RemoteAddress; IPv6SocketAddress.sin_port := HTONS(RemotePort);
if not(IsValidSocketResult(IPv6Connect(Self.IPv6TcpSocketHandle, IPv6SocketAddress, SizeOf(TIPv6SocketAddress)))) then raise Exception.Create('TIPv6TcpCommunicationChannel.Connect: Connect to address ' + TIPv6AddressUtility.ToString(RemoteAddress) + ' and port ' + IntToStr(RemotePort) + ' failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.');
Self.RemoteAddress := RemoteAddress; Self.RemotePort := RemotePort; Self.IsConnected := True;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6TcpCommunicationChannel.Send(Buffer: Pointer; BufferLen: Integer);
var
DnsPacketLen: Word;
begin
DnsPacketLen := HTONS(Word(BufferLen)); Self.InternalSend(@DnsPacketLen, SizeOf(Word)); Self.InternalSend(Buffer, BufferLen);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6TcpCommunicationChannel.InternalSend(Buffer: Pointer; BufferLen: Integer);
var
IPv6SendResult: Integer;
begin
IPv6SendResult := IPv6Send(Self.IPv6TcpSocketHandle, Buffer^, BufferLen, 0); if not(IsValidSocketResult(IPv6SendResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6SendResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.'); if (IPv6SendResult < BufferLen) then Self.InternalSendContinue(Buffer, BufferLen, IPv6SendResult);
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
procedure TIPv6TcpCommunicationChannel.InternalSendContinue(Buffer: Pointer; BufferLen: Integer; BytesSent: Integer);
var
BytesRemaining: Integer; IPv6SendResult: Integer;
begin
BytesRemaining := BufferLen - BytesSent; IPv6SendResult := IPv6Send(Self.IPv6TcpSocketHandle, Pointer(Integer(Buffer) + BytesSent)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv6SendResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6SendResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.'); while (IPv6SendResult < BytesRemaining) do begin
BytesSent := BytesSent + IPv6SendResult; BytesRemaining := BytesRemaining - IPv6SendResult; IPv6SendResult := IPv6Send(Self.IPv6TcpSocketHandle, Pointer(Integer(Buffer) + BytesSent)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv6SendResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6SendResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Send: Send failed with Windows Sockets reporting 0 bytes sent.');
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv6TcpCommunicationChannel.Receive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; MaxBufferLen: Integer; Buffer: Pointer; var BufferLen: Integer): Boolean;
var
DnsPacketLen: Word;
begin
Result := False;
if Self.InternalReceive(FirstByteTimeout, OtherBytesTimeout, @DnsPacketLen, SizeOf(Word)) then begin
DnsPacketLen := HTONS(DnsPacketLen); if (DnsPacketLen > MaxBufferLen) then DnsPacketLen := MaxBufferLen;
if Self.InternalReceive(OtherBytesTimeout, OtherBytesTimeout, Buffer, DnsPacketLen) then begin
BufferLen := DnsPacketLen; Result := True;
end;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv6TcpCommunicationChannel.InternalReceive(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; IPv6RecvResult: Integer;
begin
Result := False;
TimeVal.tv_sec := FirstByteTimeout div 1000;
TimeVal.tv_usec := 1000 * (FirstByteTimeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv6TcpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
IPv6RecvResult := IPv6Recv(Self.IPv6TcpSocketHandle, Buffer^, BufferLen, 0); if not(IsValidSocketResult(IPv6RecvResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6RecvResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.'); if (IPv6RecvResult < BufferLen) then Result := Self.InternalReceiveContinue(FirstByteTimeout, OtherBytesTimeout, Buffer, BufferLen, IPv6RecvResult) else Result := True;
end;
end;
// --------------------------------------------------------------------------
//
// --------------------------------------------------------------------------
function TIPv6TcpCommunicationChannel.InternalReceiveContinue(FirstByteTimeout: Integer; OtherBytesTimeout: Integer; Buffer: Pointer; BufferLen: Integer; BytesReceived: Integer): Boolean;
var
TimeVal: TTimeVal; ReadFDSet: TFDSet; SelectResult: Integer; BytesRemaining: Integer; IPv6RecvResult: Integer;
begin
Result := False;
TimeVal.tv_sec := OtherBytesTimeout div 1000;
TimeVal.tv_usec := 1000 * (OtherBytesTimeout mod 1000);
ReadFDSet.fd_count := 1; ReadFDSet.fd_array[0] := Self.IPv6TcpSocketHandle;
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
BytesRemaining := BufferLen - BytesReceived; IPv6RecvResult := IPv6Recv(Self.IPv6TcpSocketHandle, Pointer(Integer(Buffer) + BytesReceived)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv6RecvResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6RecvResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.'); while (IPv6RecvResult < BytesRemaining) do begin
SelectResult := Select(0, @ReadFDSet, nil, nil, @TimeVal); if not(IsValidSocketResult(SelectResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Select failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (SelectResult > 0) then begin
BytesReceived := BytesReceived + IPv6RecvResult; BytesRemaining := BytesRemaining - IPv6RecvResult; IPv6RecvResult := IPv6Recv(Self.IPv6TcpSocketHandle, Pointer(Integer(Buffer) + BytesReceived)^, BytesRemaining, 0); if not(IsValidSocketResult(IPv6RecvResult)) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets error code ' + IntToStr(WSAGetLastError) + '.'); if (IPv6RecvResult = 0) then raise Exception.Create('TIPv6TcpCommunicationChannel.Receive: Receive failed with Windows Sockets reporting 0 bytes received.');
end else begin
Exit;