Developer Builds ICMP Packet Sniffer in x64 Assembly Without Any C Libraries

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A developer has published an open-source ICMP network sniffer written entirely in x64 Assembly, bypassing standard C libraries and relying solely on direct Linux system calls. The tool uses a raw socket via syscall 41 with AF_INET and SOCK_RAW parameters to capture only ICMP packets, filtering out all TCP and UDP traffic at the OS level. Incoming packets are manually parsed by stripping the 20-byte IPv4 and 8-byte ICMP headers to access the raw payload. A custom integer-to-ASCII engine, built without any external functions, converts binary IP addresses into human-readable strings using division instructions and ASCII offset calculations. The project, released on GitHub under the handle JM00NJ, is intended strictly for educational purposes and security research on networks the user owns or has permission to monitor.

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