[test]

rule/base.go

@@ -2,6 +2,9 @@ package rules
 
 import (
 	"errors"
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
 )
 
 var (
@@ -18,3 +21,33 @@ func HasNoResolve(params []string) bool {
 	}
 	return false
 }
+
+func findNetwork(params []string) C.NetWork {
+	for _, p := range params {
+		if p == "tcp" {
+			return C.TCP
+		} else if p == "udp" {
+			return C.UDP
+		}
+	}
+	return C.ALLNet
+}
+
+func findSourceIPs(params []string) []*net.IPNet {
+	var ips []*net.IPNet
+	for _, p := range params {
+		if p == noResolve || len(p) < 7 {
+			continue
+		}
+		_, ipnet, err := net.ParseCIDR(p)
+		if err != nil {
+			continue
+		}
+		ips = append(ips, ipnet)
+	}
+
+	if len(ips) > 0 {
+		return ips
+	}
+	return nil
+}