62 lines
1.0 KiB
Go
62 lines
1.0 KiB
Go
package main
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import (
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"fmt"
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"io/ioutil"
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"net"
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"strings"
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)
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var ARPTable string = "/proc/net/arp"
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type ARPEntry struct {
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IP net.IP
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HWType int
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Flags int
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HWAddress net.HardwareAddr
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Mask string
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Device string
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}
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func ARPAnalyze() (ents []ARPEntry, err error) {
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var content []byte
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if content, err = ioutil.ReadFile(ARPTable); err != nil {
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return
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}
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for _, line := range strings.Split(string(content), "\n") {
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f := strings.Fields(line)
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if len(f) > 5 {
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var e ARPEntry
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if _, err := fmt.Sscanf(f[1], "0x%x", &e.HWType); err != nil {
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continue
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}
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if _, err := fmt.Sscanf(f[2], "0x%x", &e.Flags); err != nil {
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continue
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}
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e.IP = net.ParseIP(f[0])
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if e.HWAddress, err = net.ParseMAC(f[3]); err != nil {
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continue
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}
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e.Mask = f[4]
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e.Device = f[5]
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ents = append(ents, e)
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}
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}
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return
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}
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func ARPContainsIP(ents []ARPEntry, ip net.IP) *ARPEntry {
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for i, e := range ents {
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if e.IP.Equal(ip) && (e.Flags == 2 || e.Flags == 6) {
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return &ents[i]
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}
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}
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return nil
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}
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