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#include <Networking/TCPClient.hpp>
#include <UserExperience/UserInterface.hpp>
namespace Networking
{
// We will only receive up to 256 bytes per cycle.
constexpr int BufferSize = 256;
void TCPClient::SendRawBytes(ByteArray &Bytes)
{
// Send data.
int32_t Result = send(m_Socket, (char *)Bytes.data(), (int)Bytes.size(), 0);
if(Result == -1)
INFO_ASSERT(STR("[000F:00002B00] Server closed the connection unexpectedly."));
WRAP_IF_DEBUG(
size_t BreakIndex = 0;
printf("[DEBUG] Sending data (%zd bytes):\n[DEBUG] ", Bytes.size());
for(auto &Byte : Bytes)
{
printf("%02x ", Byte);
if(BreakIndex++ % 8 == 0)
printf("\n[DEBUG] ");
}
printf("\n");
);
}
ByteArray TCPClient::ReceiveRawBytes()
{
ByteArray ReceivedBytes;
uint8_t RecvBuffer[BufferSize];
// Attempt to receive a packet.
while(true)
{
int32_t Received = recv(m_Socket, (char*)RecvBuffer, BufferSize, 0);
// No more bytes left to receive.
if(Received < 0)
break;
// Emplace all received bytes.
for(int n = 0; n < Received; ++n)
{
ReceivedBytes.push_back(RecvBuffer[n]);
}
// No more bytes left to receive.
if(Received < BufferSize)
break;
}
WRAP_IF_DEBUG(
size_t BreakIndex = 0;
printf("[DEBUG] Receiving data (%zd bytes):\n[DEBUG] ", ReceivedBytes.size());
for(auto &Byte : ReceivedBytes)
{
printf("%02x ", Byte);
if(BreakIndex++ % 8 == 0)
printf("\n[DEBUG] ");
}
printf("\n");
);
return ReceivedBytes;
}
void TCPClient::SendBytes(ByteArray &Bytes)
{
// Encrypt outgoing data.
ByteArray EncryptionKey;
EncryptionKey.insert(
EncryptionKey.begin(),
m_EncryptionKey,
m_EncryptionKey + sizeof m_EncryptionKey
);
Wrapper::Encryption Encryption; Encryption.Start(EncryptionKey);
ByteArray Encrypted = Encryption.Encrypt(Bytes);
SendRawBytes(Encrypted);
}
ByteArray TCPClient::ReceiveBytes()
{
// Decrypt incoming data.
ByteArray ReceivedBytes = ReceiveRawBytes();
ByteArray EncryptionKey;
EncryptionKey.insert(
EncryptionKey.begin(),
m_EncryptionKey,
m_EncryptionKey + sizeof m_EncryptionKey
);
Wrapper::Encryption Encryption; Encryption.Start(EncryptionKey);
ByteArray Decrypted = Encryption.Decrypt(ReceivedBytes);
return Decrypted;
}
bool TCPClient::Start(uint32_t ServerAddress, uint16_t ServerPort)
{
const int32_t version = 0x101;
// Initialise WinSocks.
if(WSAStartup(version, &m_WinSocks))
return false;
// Create an IPv4 socket.
m_Socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(m_Socket == INVALID_SOCKET)
return false;
// Set up client context.
m_Context.sin_addr.s_addr = ServerAddress;
m_Context.sin_family = AF_INET;
m_Context.sin_port = htons(ServerPort);
// Attempt connection.
if(connect(m_Socket, (sockaddr *)&m_Context, sizeof m_Context))
return false;
// Initialise encryption wrapper.
WRAP_IF_DEBUG(
printf("[DEBUG] Attempting to handshake with server...\n");
);
ByteArray EncryptionKey = ReceiveRawBytes();
if(EncryptionKey.empty())
return false;
std::memcpy(m_EncryptionKey, EncryptionKey.data(), EncryptionKey.size());
WRAP_IF_DEBUG(
printf("[DEBUG] Server handshake successful!\n");
)
return true;
}
void TCPClient::Kill()
{
if(m_Socket)
closesocket(m_Socket);
WSACleanup();
}
}
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