Avoid mess other platform.

core/core.go

@@ -46,7 +46,3 @@ func Exec(executable string, args []string) (string, error) {
 		return str.Trim(string(raw)), nil
 	}
 }
-
-func ExecInEnglish(executable string, args []string) (string, error) {
-	return Exec("cmd", append([]string{"/C", "chcp 437", "&&", executable}, args...))
-}

core/core_windows.go

@@ -3,3 +3,7 @@ package core
 func Shell(cmd string) (string, error) {
 	return Exec("cmd.exe", []string{"/c", cmd})
 }
+
+func ExecInEnglish(executable string, args []string) (string, error) {
+	return Exec("cmd", append([]string{"/C", "chcp 437", "&&", executable}, args...))
+}

network/net.go

@@ -303,7 +303,7 @@ func SetInterfaceTxPower(name string, txpower int) error {
 }
 
 func GatewayProvidedByUser(iface *Endpoint, gateway string) (*Endpoint, error) {
-	Debug("GatewayProvidedByUser(%s) [cmd=%v opts=%v]", gateway, IPv4RouteCmd, IPv4RouteCmdOpts)
+	Debug("GatewayProvidedByUser(%s) [cmd=%v opts=%v parser=%v]", gateway, IPv4RouteCmd, IPv4RouteCmdOpts, IPv4RouteParser)
 	if IPv4Validator.MatchString(gateway) {
 		Debug("valid gateway ip %s", gateway)
 		// we have the address, now we need its mac

network/net_gateway.go

@@ -1,19 +1,20 @@
 // +build !android
+// +build !windows
 
 package network
 
 import (
-	"bufio"
-	"fmt"
 	"strings"
 
 	"github.com/bettercap/bettercap/core"
+
+	"github.com/evilsocket/islazy/str"
 )
 
 func FindGateway(iface *Endpoint) (*Endpoint, error) {
-	Debug("FindGateway(%s) [cmd=%v opts=%v]", iface.Name(), IPv4RouteCmd, IPv4RouteCmdOpts)
+	Debug("FindGateway(%s) [cmd=%v opts=%v parser=%v]", iface.Name(), IPv4RouteCmd, IPv4RouteCmdOpts, IPv4RouteParser)
 
-	output, err := core.ExecInEnglish(IPv4RouteCmd, append(IPv4RouteCmdOpts, fmt.Sprintf("%d", iface.Index)))
+	output, err := core.Exec(IPv4RouteCmd, IPv4RouteCmdOpts)
 	if err != nil {
 		Debug("FindGateway(%s): core.Exec failed with %s", err)
 		return nil, err
@@ -22,24 +23,25 @@ func FindGateway(iface *Endpoint) (*Endpoint, error) {
 	Debug("FindGateway(%s) output:\n%s", iface.Name(), output)
 
 	ifName := iface.Name()
-	scanner := bufio.NewScanner(strings.NewReader(output))
+	for _, line := range strings.Split(output, "\n") {
-	for scanner.Scan() {
+		if line = str.Trim(line); strings.Contains(line, ifName) {
-		keyPair := strings.Split(scanner.Text(), ":")
+			m := IPv4RouteParser.FindStringSubmatch(line)
-		if len(keyPair) != 2 {
+			if len(m) >= IPv4RouteTokens {
-			continue
+				Debug("FindGateway(%s) line '%s' matched with %v", iface.Name(), line, m)
-		}
+				return IPv4RouteIsGateway(ifName, m, func(gateway string) (*Endpoint, error) {
-		key, value := strings.TrimSpace(keyPair[0]), strings.TrimSpace(keyPair[1])
+					if gateway == iface.IpAddress {
-		if key == "Default Gateway" {
+						Debug("gateway is the interface")
-			if value == iface.IpAddress {
 						return iface, nil
 					} else {
 						// we have the address, now we need its mac
-				mac, err := ArpLookup(ifName, value, false)
+						mac, err := ArpLookup(ifName, gateway, false)
 						if err != nil {
 							return nil, err
 						}
-				Debug("gateway is %s[%s]", value, mac)
+						Debug("gateway is %s[%s]", gateway, mac)
-				return NewEndpoint(value, mac), nil
+						return NewEndpoint(gateway, mac), nil
+					}
+				})
 			}
 		}
 	}

network/net_gateway_windows.go

@@ -0,0 +1,46 @@
+package network
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/bettercap/bettercap/core"
+	"strings"
+)
+
+func FindGateway(iface *Endpoint) (*Endpoint, error) {
+	Debug("FindGateway(%s) [cmd=%v opts=%v parser=%v]", iface.Name(), IPv4RouteCmd, IPv4RouteCmdOpts, IPv4RouteParser)
+
+	output, err := core.ExecInEnglish(IPv4RouteCmd, append(IPv4RouteCmdOpts, fmt.Sprintf("%d", iface.Index)))
+	if err != nil {
+		Debug("FindGateway(%s): core.Exec failed with %s", err)
+		return nil, err
+	}
+
+	Debug("FindGateway(%s) output:\n%s", iface.Name(), output)
+
+	ifName := iface.Name()
+	scanner := bufio.NewScanner(strings.NewReader(output))
+	for scanner.Scan() {
+		keyPair := strings.Split(scanner.Text(), ":")
+		if len(keyPair) != 2 {
+			continue
+		}
+		key, value := strings.TrimSpace(keyPair[0]), strings.TrimSpace(keyPair[1])
+		if key == "Default Gateway" {
+			if value == iface.IpAddress {
+				return iface, nil
+			} else {
+				// we have the address, now we need its mac
+				mac, err := ArpLookup(ifName, value, false)
+				if err != nil {
+					return nil, err
+				}
+				Debug("gateway is %s[%s]", value, mac)
+				return NewEndpoint(value, mac), nil
+			}
+		}
+	}
+
+	Debug("FindGateway(%s): nothing found :/", iface.Name())
+	return nil, ErrNoGateway
+}

network/net_windows.go

@@ -3,22 +3,18 @@ package network
 import (
 	"fmt"
 	"net"
+	"regexp"
 	"strings"
 
 	"github.com/google/gopacket/pcap"
 )
 
 // only matches gateway lines
+var IPv4RouteParser = regexp.MustCompile("^.+\\s+.+\\s+\\d+\\s+([0-9\\.]+/\\d+)\\s+\\d+\\s+([0-9\\.]+).*$")
+var IPv4RouteTokens = 3
 var IPv4RouteCmd = "netsh"
 var IPv4RouteCmdOpts = []string{"interface", "ipv4", "show", "address"}
 
-func IPv4RouteIsGateway(ifname string, tokens []string, f func(gateway string) (*Endpoint, error)) (*Endpoint, error) {
-	// TODO check if the subnet is the same as iface ?
-	// subnet := tokens[1]
-	gateway := tokens[2]
-	return f(gateway)
-}
-
 /*
  * net.Interface does not have the correct name on Windows and pcap.Interface
  * does not have the hardware address for some reason ... so this is what I