This is an advanced TCP client-server application implemented in C++ using Winsock for Windows. The application provides reliable data transport at the application layer, considering a channel with data loss and errors. It listens on port 443 for the server and uses the same port for the client to connect.
Before running this code, make sure you have the following:
- Visual Studio or a C++ development environment for Windows.
- Winsock library installed (linked via
#pragma comment(lib, "Ws2_32.lib")). - Cryptographic API library (linked via
-lcrypt32for the server).
To compile the server and client, use the following commands:
For the server:
g++ server.cpp -o server.exe -lws2_32 -lcrypt32 -std=c++11P
For the client:
g++ client.cpp -o client.exe -lws2_32 -std=c++11
- Clone the repository or download the source code.
- Open the project in your C++ development environment.
- Build and run the code using the compilation commands above.
- The server will start listening on port 443, and the client can connect to it.
- The server binds to the local IP address and port 443.
- It accepts incoming connections from clients.
- Both the client and server use a sliding window algorithm for reliable data transport.
- Messages are expected to end with "\r\n".
- The application handles:
- Checksums for data integrity
- Timers for timeouts
- Sequence numbers for ordered data transfer
- Acknowledgments (ACK) and Negative Acknowledgments (NACK)
- The server responds with either an "ACK" or "NACK" based on the received message's integrity and sequence number.
If you encounter any issues, consider checking the following:
- Ensure that the Winsock and Cryptographic API libraries are properly linked.
- Make sure no other application is using port 443 on your system.
This code is for educational purposes only and should be used responsibly and ethically. It demonstrates advanced socket programming concepts and should not be used for malicious purposes.