This repository is a collection of low-level network utilities written in C, designed to help understand and implement foundational network protocols and tools without relying on external libraries or high-level APIs.
It aims to build core networking skills using raw sockets, manual protocol handling, and custom packet construction.
| Folder | Description |
|---|---|
Fingerprinting |
Tools to identify systems, banners, and open ports (active/passive scan). |
Network_Mapping |
DNS lookup, WHOIS queries, and traceroute-style implementations. |
Server-Client Relationship |
Basic TCP/UDP socket programming for custom client/server applications. |
✅ DNS Lookup
→ Send and parse DNS query packets manually to resolve domain names.
✅ WHOIS Query
→ Connect to WHOIS servers and retrieve domain ownership/registration data.
✅ Traceroute-like Utility
→ Send packets with incremental TTL and analyze ICMP replies to trace routes.
✅ Zone Transfer (AXFR)
→ Connect to DNS servers and attempt zone transfers (for educational purposes).
✅ Custom Server-Client Architecture
→ Build minimal TCP/UDP echo and messaging servers using raw socket APIs.
| Category | Planned Enhancements |
|---|---|
| 🔍 Nmap-style Scanning | Open port and service discovery using TCP/UDP probes. |
| 📡 Protocol Emulation | FTP, SMTP, HTTP request parsing and minimal response logic. |
| 🧠 DNS Expansion | Reverse DNS lookups, MX record retrieval, and custom resolver logic. |
| 🧪 Packet Analysis | Raw packet sniffing with custom filters (no libpcap). |
| 📶 ARP/ICMP Tools | ARP spoofing, ping utilities, and spoofed ICMP packet creation. |
+---------+ TTL=1 +--------+ TTL=2 +---------+ | Your PC | ---------------> | Router | ---------------> | Gateway | +---------+ (ICMP) +--------+ (ICMP) +---------+ | ↑ ↑ └-------> Receives ICMP TTL Exceeded <---------------┘
- Clone the repository:
git clone https://github.com/abkarada/C_Network_Tools.git
cd C_Network_Tools
gcc Network_Mapping/dns_lookup.c -o dns_lookup
./dns_lookup example.com