fix: refactored routing logic (fixes #701)

routing/update_windows.go

@@ -0,0 +1,44 @@
+package routing
+
+import (
+	"github.com/bettercap/bettercap/core"
+	"github.com/evilsocket/islazy/str"
+	"regexp"
+	"strings"
+)
+
+var parser = regexp.MustCompile(`^.+\d+\s+([^\s]+)\s+\d+\s+(.+)$`)
+
+func update() ([]Route, error) {
+	table = make([]Route, 0)
+
+	for ip, inet := range map[RouteType]string{IPv4: "ipv4", IPv6: "ipv6"} {
+		output, err := core.Exec("netsh", []string{"interface", inet, "show", "route"})
+		if err != nil {
+			return nil, err
+		}
+
+		for _, line := range strings.Split(output, "\n") {
+			if line = str.Trim(line); len(line) > 0 {
+				matches := parser.FindStringSubmatch(line)
+				if num := len(matches); num == 3 {
+					route := Route{
+						Type:        ip,
+						Destination: matches[1],
+						Device:      matches[2],
+					}
+
+					if route.Destination == "0.0.0.0/0" || route.Destination == "::/0" {
+						route.Default = true
+						route.Gateway = route.Device
+						route.Device = ""
+					}
+
+					table = append(table, route)
+				}
+			}
+		}
+	}
+
+	return table, nil
+}