Add shadowsocks tests

test/clash_darwin_test.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"net/netip"
+	"syscall"
+
+	"golang.org/x/net/route"
+)
+
+func defaultRouteIP() (netip.Addr, error) {
+	idx, err := defaultRouteInterfaceIndex()
+	if err != nil {
+		return netip.Addr{}, err
+	}
+	iface, err := net.InterfaceByIndex(idx)
+	if err != nil {
+		return netip.Addr{}, err
+	}
+	addrs, err := iface.Addrs()
+	if err != nil {
+		return netip.Addr{}, err
+	}
+	for _, addr := range addrs {
+		ip := addr.(*net.IPNet).IP
+		if ip.To4() != nil {
+			return netip.AddrFrom4(*(*[4]byte)(ip)), nil
+		}
+	}
+
+	return netip.Addr{}, errors.New("no ipv4 addr")
+}
+
+func defaultRouteInterfaceIndex() (int, error) {
+	rib, err := route.FetchRIB(syscall.AF_UNSPEC, syscall.NET_RT_DUMP2, 0)
+	if err != nil {
+		return 0, fmt.Errorf("route.FetchRIB: %w", err)
+	}
+	msgs, err := route.ParseRIB(syscall.NET_RT_IFLIST2, rib)
+	if err != nil {
+		return 0, fmt.Errorf("route.ParseRIB: %w", err)
+	}
+	for _, message := range msgs {
+		routeMessage := message.(*route.RouteMessage)
+		if routeMessage.Flags&(syscall.RTF_UP|syscall.RTF_GATEWAY|syscall.RTF_STATIC) == 0 {
+			continue
+		}
+
+		addresses := routeMessage.Addrs
+
+		destination, ok := addresses[0].(*route.Inet4Addr)
+		if !ok {
+			continue
+		}
+
+		if destination.IP != [4]byte{0, 0, 0, 0} {
+			continue
+		}
+
+		switch addresses[1].(type) {
+		case *route.Inet4Addr:
+			return routeMessage.Index, nil
+		default:
+			continue
+		}
+	}
+
+	return 0, fmt.Errorf("ambiguous gateway interfaces found")
+}