https://github.com/joexbayer/networking_c

MacOS TAP Ethernet interface that responds ICMP, UDP over IPv4.
https://github.com/joexbayer/networking_c

networking

Last synced: 8 days ago
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MacOS TAP Ethernet interface that responds ICMP, UDP over IPv4.

• Host: GitHub
• URL: https://github.com/joexbayer/networking_c
• Owner: joexbayer
• Created: 2021-06-23T12:16:23.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-07-18T17:38:50.000Z (over 3 years ago)
• Last Synced: 2023-08-09T21:28:46.015Z (about 1 year ago)
• Topics: networking
• Language: C
• Homepage:
• Size: 1.22 MB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Networking code for macOS with Tun/Tap

## Using TAP as a network interface to read and write packets.

### UDP

![alt text](https://github.com/joexbayer/Networking_c/blob/main/pictures/udp.png?raw=true)

### ARP

![alt text](https://github.com/joexbayer/Networking_c/blob/main/pictures/arp.png?raw=true)

![alt text](https://github.com/joexbayer/Networking_c/blob/main/pictures/arp_table.png?raw=true)

### ICMP

![alt text](https://github.com/joexbayer/Networking_c/blob/main/pictures/icmp_cli.png?raw=true)

![alt text](https://github.com/joexbayer/Networking_c/blob/main/pictures/icmp_wireshark.png?raw=true)

Currently working:

Parsing Ethernett Packets.

Accepting and parsing IPv4 packets.

Calculate checksum based on RFC 1071 #4.1.

Using a sk_buff.

Configurable net device with IP and MAC.

Parsing ICMP and responding ping.

Printing UDP messages from netcat.

Parsing ARP, sending ARP reply and saving ARP cache


For TAP on MacOS: TunTap

Inspired by: 

Linux Network Stack and 

Networking History