add external ip route command

.gitignore

@@ -1,3 +1,4 @@
 test.sh
 openvpn-dm-mgt-server
 openvpn-dm-mgt-server.conf
+iproute/iproute

iproute/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"os/exec"
+	"regexp"
+)
+
+func checkArg(args []string, pos int, value string) {
+	if args[pos] != value {
+		fmt.Println(errors.New("invalid command : " + args[pos]))
+		os.Exit(10 + pos)
+	}
+}
+
+func main() {
+	if len(os.Args) != 6 {
+		fmt.Println(errors.New("missing args"), len(os.Args))
+		os.Exit(1)
+	}
+
+	args := os.Args[1:]
+
+	r := regexp.MustCompile("[^a-zA-Z0-9.-]")
+	var ip string
+
+	checkArg(args, 0, "route")
+	checkArg(args, 1, "replace")
+
+	if testip := net.ParseIP(args[2]); testip != nil {
+		ip = testip.String()
+	} else {
+		fmt.Println(errors.New("invalid ip"))
+		os.Exit(2)
+	}
+
+	checkArg(args, 3, "dev")
+
+	dev := r.ReplaceAllString(args[4], "")
+
+	cmd := exec.Command("/bin/ip", "route", "replace", ip, "dev", dev)
+	if err := cmd.Run(); err != nil {
+		fmt.Println(err)
+		os.Exit(3)
+	}
+}