refact: divided os specific code for arp parsing

net/arp.go

@@ -2,11 +2,7 @@ package net
 
 import (
 	"fmt"
-	"regexp"
-	"strings"
 	"sync"
-
-	"github.com/evilsocket/bettercap-ng/core"
 )
 
 type ArpTable map[string]string
@@ -17,9 +13,6 @@ var (
 	arp_table  = make(ArpTable)
 )
 
-var ArpTableParser = regexp.MustCompile("^[^\\d\\.]+([\\d\\.]+).+\\s+([a-f0-9:]{17}).+\\s+(.+)$")
-var ArpTableTokens = 4
-
 func ArpDiff(current, before ArpTable) ArpTable {
 	diff := make(ArpTable)
 	for ip, mac := range current {
@@ -53,35 +46,3 @@ func ArpParsed() bool {
 	defer arp_lock.Unlock()
 	return arp_parsed
 }
-
-func ArpUpdate(iface string) (ArpTable, error) {
-	arp_lock.Lock()
-	defer arp_lock.Unlock()
-
-	// Signal we parsed the ARP table at least once.
-	arp_parsed = true
-
-	// Run "arp -an" and parse the output.
-	output, err := core.Exec("arp", []string{"-a", "-n"})
-	if err != nil {
-		return arp_table, err
-	}
-
-	new_table := make(ArpTable)
-	for _, line := range strings.Split(output, "\n") {
-		m := ArpTableParser.FindStringSubmatch(line)
-		if len(m) == ArpTableTokens {
-			address := m[1]
-			mac := m[2]
-			ifname := m[3]
-
-			if ifname == iface {
-				new_table[address] = mac
-			}
-		}
-	}
-
-	arp_table = new_table
-
-	return arp_table, nil
-}

net/arp_unix.go

@@ -0,0 +1,43 @@
+package net
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/evilsocket/bettercap-ng/core"
+)
+
+var ArpTableParser = regexp.MustCompile("^[^\\d\\.]+([\\d\\.]+).+\\s+([a-f0-9:]{17}).+\\s+(.+)$")
+var ArpTableTokens = 4
+
+func ArpUpdate(iface string) (ArpTable, error) {
+	arp_lock.Lock()
+	defer arp_lock.Unlock()
+
+	// Signal we parsed the ARP table at least once.
+	arp_parsed = true
+
+	// Run "arp -an" and parse the output.
+	output, err := core.Exec("arp", []string{"-a", "-n"})
+	if err != nil {
+		return arp_table, err
+	}
+
+	new_table := make(ArpTable)
+	for _, line := range strings.Split(output, "\n") {
+		m := ArpTableParser.FindStringSubmatch(line)
+		if len(m) == ArpTableTokens {
+			address := m[1]
+			mac := m[2]
+			ifname := m[3]
+
+			if ifname == iface {
+				new_table[address] = mac
+			}
+		}
+	}
+
+	arp_table = new_table
+
+	return arp_table, nil
+}