Count Packets in a PCAP

pcap_count_packets.go

package main

import (
  "flag"
  "fmt"
  "github.com/google/gopacket"
  "github.com/google/gopacket/pcap"
  "log"
)

var (
  pcapFile = flag.String("r", "", "Filename to read from")
  handle   *pcap.Handle
  err      error
)

func main() {
  flag.Parse()
  packet_count = 0
  
  // Open file instead of device
  handle, err = pcap.OpenOffline(*pcapFile)
  if err != nil { 
    log.Fatal(err) 
  }
  defer handle.Close()

  packetSource := gopacket.NewPacketSource(handle, handle.LinkType())
  for range packetSource.Packets() {
    packet_count++
  }
  
  fmt.Printf("%d\n", packet_count)
}