Packet Analyzer

• A simple packet analyzer/sniffer , intercepts and log traffic that passes over a network.
• Supports live packet capture from multiple network interfaces (using goroutines) and packet filtering. You can also save the captured traffic to a file and analyze later using a program like wireshark.
• Why a packet sniffer ? Just another understanding computers(networking) exercise.

Usage

Available Commands:
  capture      Capture packets
  help         Help about any command
  list_devices Listen network devices

Flags:
  -h, --help   help for root

Capture

Capture packets

Usage:
  root capture [flags]

Flags:
  -d, --devices stringArray   Devices to capture on
  -f, --file string           Pcap file
  -F, --filter string         BPF filter
  -h, --help                  help for capture
  -N, --max_packets int       Maximum number of packets to capture

Example

• To capture traffic on eth0 and wlan0 with BPF filter tcp and port 8000 and save to file out.pcap

go run main.go capture -d wlan0 -d eth0 -f out.pcap - F 'tcp and port 8000'

Resources

• https://godoc.org/github.com/google/gopacket