Port Scanner

A C++ network port scanner for learning socket programming and networking fundamentals.

🎯 Current Features

Working Implementation:

• Multi-port TCP connection testing
• Predefined common service port scanning
• Clean output showing only open ports
• Proper socket lifecycle management
• Input validation and error handling

Sample Output:

 ___                  _         ___
| _ \   ___    _ _   | |_      / __|   __    __ _    _ _     _ _     ___    _ _
|  _/  / _ \  | '_|  |  _|     \__ \  / _|  / _` |  | ' \   | ' \   / -_)  | '_|
|_|    \___/  |_|     \__|     |___/  \__|  \__,_|  |_||_|  |_||_|  \___|  |_|

Enter target IP (or 'quit' / 'q' to exit): 127.0.0.1
[1] Quick Scan
[2] Custom Port Range
[3] Exit

Enter choice: 1

[Quick Scan] Scanning common ports...
Port 81 : CLOSED
Port 110 : CLOSED
Port 135 : OPEN
Port 143 : CLOSED
Port 443 : CLOSED
Port 445 : OPEN

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🚀 Skills Demonstrated

• Winsock API: Socket creation, connection handling, cleanup
• C++ STL: Vector containers, range-based loops
• Network Programming: TCP connection testing, port enumeration
• Resource Management: Proper socket lifecycle and memory cleanup

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🔧 Build & Run

Requirements:

• Windows 10/11
• g++ with C++17 support
• CMake 3.13+

Build:

mkdir build && cd build
cmake ..
cmake --build .
../port-scanner.exe