更改目录结构

server/pkg/arpdis/lookup.go

@@ -0,0 +1,61 @@
+// Currently only Darwin and Linux support this.
+
+package arpdis
+
+import (
+	"log"
+	"net"
+	"os/exec"
+	"strings"
+)
+
+func doLookup(ip net.IP) *Addr {
+	// ping := exec.Command("ping", "-c1", "-t1", ip.String())
+	// if err := ping.Run(); err != nil {
+	// 	addr := &Addr{IP: ip, Type: TypeUnreachable}
+	// 	return addr
+	// }
+
+	err := doPing(ip.String())
+	if err != nil {
+		// log.Println(err)
+		addr := &Addr{IP: ip, Type: TypeUnreachable}
+		return addr
+	}
+
+	return doArpShow(ip)
+}
+
+func doArpShow(ip net.IP) *Addr {
+	cmd := exec.Command("ip", "n", "show", ip.String())
+	out, err := cmd.Output()
+	if err != nil {
+		log.Println("lookup show", err)
+		return nil
+	}
+
+	// os.Open("/proc/net/arp")
+	// 192.168.1.2      0x1         0x2         e0:94:67:e2:42:5d     *        eth0
+	// 192.168.1.2 dev eth0 lladdr 08:00:27:94:a5:a4 STALE
+	outS := strings.ReplaceAll(string(out), "  ", " ")
+	outS = strings.TrimSpace(outS)
+	arpArr := strings.Split(outS, " ")
+	if len(arpArr) != 6 {
+		log.Println("lookup arpArr", outS, ip)
+		return nil
+	}
+	mac, err := net.ParseMAC(arpArr[4])
+	if err != nil {
+		log.Println("lookup mac", outS, err)
+		return nil
+	}
+
+	return &Addr{IP: ip, HardwareAddr: mac}
+}
+
+// IP address       HW type     Flags       HW address            Mask     Device
+// 172.23.24.12     0x1         0x2         00:e0:4c:73:5c:48     *        anylink0
+// 172.23.24.1      0x1         0x2         3c:8c:40:a0:7a:2d     *        anylink0
+// 172.23.24.13     0x1         0x2         00:1c:42:4d:33:46     *        anylink0
+// 172.23.24.2      0x1         0x0         00:00:00:00:00:00     *        anylink0
+// 172.23.24.14     0x1         0x0         00:00:00:00:00:00     *        anylink0