From d72349e63fe18c534df556f94e78b3979d526b1d Mon Sep 17 00:00:00 2001
From: Shannon Haworth <shannon.haworth@gmail.com>
Date: Sat, 6 Oct 2018 23:38:17 -0400
Subject: [PATCH] Update arp.go

Added SearchByMac which returns the IP Address for a given MAC Address
---
 arp.go | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arp.go b/arp.go
index a4958ec..0dadd8d 100644
--- a/arp.go
+++ b/arp.go
@@ -2,6 +2,7 @@ package arp
 
 import (
 	"time"
+	"errors"
 )
 
 type ArpTable map[string]string
@@ -47,3 +48,15 @@ func CacheUpdateCount() int {
 func Search(ip string) string {
 	return arpCache.Search(ip)
 }
+
+// Search looks up the IP address by MAC address
+// in the arp table
+func SearchByMac(target string) (string, error) {
+	for ip, _ := range Table() {
+		m := Search(ip)
+		if(m == target) {
+			return ip, nil
+		}
+	}
+	return "", errors.New("Mac not found")
+}