initial commit

listener/tun/metadata.go

@@ -0,0 +1,63 @@
+package tun
+
+import (
+	"net"
+	"strings"
+
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
+	tun_util "github.com/go-gost/x/internal/util/tun"
+)
+
+const (
+	DefaultMTU = 1350
+)
+
+type metadata struct {
+	config *tun_util.Config
+}
+
+func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
+	const (
+		name    = "name"
+		netKey  = "net"
+		peer    = "peer"
+		mtu     = "mtu"
+		routes  = "routes"
+		gateway = "gw"
+	)
+
+	config := &tun_util.Config{
+		Name:    mdata.GetString(md, name),
+		Net:     mdata.GetString(md, netKey),
+		Peer:    mdata.GetString(md, peer),
+		MTU:     mdata.GetInt(md, mtu),
+		Gateway: mdata.GetString(md, gateway),
+	}
+	if config.MTU <= 0 {
+		config.MTU = DefaultMTU
+	}
+
+	gw := net.ParseIP(config.Gateway)
+
+	for _, s := range mdata.GetStrings(md, routes) {
+		ss := strings.SplitN(s, " ", 2)
+		if len(ss) == 2 {
+			var route tun_util.Route
+			_, ipNet, _ := net.ParseCIDR(strings.TrimSpace(ss[0]))
+			if ipNet == nil {
+				continue
+			}
+			route.Net = *ipNet
+			route.Gateway = net.ParseIP(ss[1])
+			if route.Gateway == nil {
+				route.Gateway = gw
+			}
+
+			config.Routes = append(config.Routes, route)
+		}
+	}
+
+	l.md.config = config
+
+	return
+}