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main.go
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main.go
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// Copyright 2012 Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
// The pcapdump binary implements a tcpdump-like command line tool with gopacket
// using pcap as a backend data collection mechanism.
package main
import (
"code.google.com/p/gopacket/dumpcommand"
"code.google.com/p/gopacket/pcap"
"flag"
"fmt"
"log"
"os"
"strings"
"time"
)
var iface = flag.String("i", "eth0", "Interface to read packets from")
var fname = flag.String("r", "", "Filename to read from, overrides -i")
var snaplen = flag.Int("s", 65536, "Snap length (number of bytes max to read per packet")
func main() {
flag.Parse()
var handle *pcap.Handle
var err error
if *fname != "" {
if handle, err = pcap.OpenOffline(*fname); err != nil {
log.Fatalln("PCAP OpenOffline error:", err)
}
} else {
if handle, err = pcap.OpenLive(*iface, int32(*snaplen), true, time.Second); err != nil {
log.Fatalln("PCAP OpenLive error:", err)
}
if len(flag.Args()) > 0 {
bpffilter := strings.Join(flag.Args(), " ")
fmt.Fprintf(os.Stderr, "Using BPF filter %q\n", bpffilter)
if err = handle.SetBPFFilter(bpffilter); err != nil {
log.Fatalln("BPF filter error:", err)
}
}
}
dumpcommand.Run(handle)
}