62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// Currently only Darwin and Linux support this.
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package arpdis
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import (
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"log"
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"net"
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"os/exec"
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"strings"
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)
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func doLookup(ip net.IP) *Addr {
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// ping := exec.Command("ping", "-c1", "-t1", ip.String())
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// if err := ping.Run(); err != nil {
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// addr := &Addr{IP: ip, Type: TypeUnreachable}
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// return addr
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// }
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err := doPing(ip.String())
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if err != nil {
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// log.Println(err)
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addr := &Addr{IP: ip, Type: TypeUnreachable}
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return addr
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}
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return doArpShow(ip)
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}
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func doArpShow(ip net.IP) *Addr {
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cmd := exec.Command("ip", "n", "show", ip.String())
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out, err := cmd.Output()
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if err != nil {
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log.Println("lookup show", err)
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return nil
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}
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// os.Open("/proc/net/arp")
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// 192.168.1.2 0x1 0x2 e0:94:67:e2:42:5d * eth0
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// 192.168.1.2 dev eth0 lladdr 08:00:27:94:a5:a4 STALE
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outS := strings.ReplaceAll(string(out), " ", " ")
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outS = strings.TrimSpace(outS)
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arpArr := strings.Split(outS, " ")
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if len(arpArr) != 6 {
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log.Println("lookup arpArr", outS, ip)
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return nil
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}
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mac, err := net.ParseMAC(arpArr[4])
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if err != nil {
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log.Println("lookup mac", outS, err)
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return nil
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}
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return &Addr{IP: ip, HardwareAddr: mac}
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}
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// IP address HW type Flags HW address Mask Device
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// 172.23.24.12 0x1 0x2 00:e0:4c:73:5c:48 * anylink0
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// 172.23.24.1 0x1 0x2 3c:8c:40:a0:7a:2d * anylink0
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// 172.23.24.13 0x1 0x2 00:1c:42:4d:33:46 * anylink0
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// 172.23.24.2 0x1 0x0 00:00:00:00:00:00 * anylink0
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// 172.23.24.14 0x1 0x0 00:00:00:00:00:00 * anylink0
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