feat: Add multi-peer support for wireguard outbound

adapter/outbound/wireguard.go

@@ -41,19 +41,26 @@ type WireGuard struct {
 
 type WireGuardOption struct {
 	BasicOption
+	WireGuardPeerOption
 	Name                string `proxy:"name"`
-	Server              string  `proxy:"server"`
-	Port                int     `proxy:"port"`
-	Ip                  string  `proxy:"ip,omitempty"`
-	Ipv6                string  `proxy:"ipv6,omitempty"`
 	PrivateKey          string `proxy:"private-key"`
-	PublicKey           string  `proxy:"public-key"`
-	PreSharedKey        string  `proxy:"pre-shared-key,omitempty"`
-	Reserved            []uint8 `proxy:"reserved,omitempty"`
 	Workers             int    `proxy:"workers,omitempty"`
 	MTU                 int    `proxy:"mtu,omitempty"`
 	UDP                 bool   `proxy:"udp,omitempty"`
 	PersistentKeepalive int    `proxy:"persistent-keepalive,omitempty"`
+
+	Peers []WireGuardPeerOption `proxy:"peers,omitempty"`
+}
+
+type WireGuardPeerOption struct {
+	Server       string   `proxy:"server"`
+	Port         int      `proxy:"port"`
+	Ip           string   `proxy:"ip,omitempty"`
+	Ipv6         string   `proxy:"ipv6,omitempty"`
+	PublicKey    string   `proxy:"public-key,omitempty"`
+	PreSharedKey string   `proxy:"pre-shared-key,omitempty"`
+	Reserved     []uint8  `proxy:"reserved,omitempty"`
+	AllowedIPs   []string `proxy:"allowed_ips,omitempty"`
 }
 
 type wgSingDialer struct {
@@ -80,32 +87,11 @@ func (d wgNetDialer) DialContext(ctx context.Context, network, address string) (
 	return d.tunDevice.DialContext(ctx, network, M.ParseSocksaddr(address).Unwrap())
 }
 
-func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
-	outbound := &WireGuard{
-		Base: &Base{
-			name:   option.Name,
-			addr:   net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
-			tp:     C.WireGuard,
-			udp:    option.UDP,
-			iface:  option.Interface,
-			rmark:  option.RoutingMark,
-			prefer: C.NewDNSPrefer(option.IPVersion),
-		},
-		dialer: &wgSingDialer{dialer: dialer.NewDialer()},
+func (option WireGuardPeerOption) Addr() M.Socksaddr {
+	return M.ParseSocksaddrHostPort(option.Server, uint16(option.Port))
 }
-	runtime.SetFinalizer(outbound, closeWireGuard)
 
-	var reserved [3]uint8
-	if len(option.Reserved) > 0 {
-		if len(option.Reserved) != 3 {
-			return nil, E.New("invalid reserved value, required 3 bytes, got ", len(option.Reserved))
-		}
-		reserved[0] = uint8(option.Reserved[0])
-		reserved[1] = uint8(option.Reserved[1])
-		reserved[2] = uint8(option.Reserved[2])
-	}
-	peerAddr := M.ParseSocksaddrHostPort(option.Server, uint16(option.Port))
-	outbound.bind = wireguard.NewClientBind(context.Background(), outbound.dialer, true, peerAddr, reserved)
+func (option WireGuardPeerOption) Prefixes() ([]netip.Prefix, error) {
 	localPrefixes := make([]netip.Prefix, 0, 2)
 	if len(option.Ip) > 0 {
 		if !strings.Contains(option.Ip, "/") {
@@ -130,7 +116,46 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 	if len(localPrefixes) == 0 {
 		return nil, E.New("missing local address")
 	}
-	var privateKey, peerPublicKey, preSharedKey string
+	return localPrefixes, nil
+}
+
+func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
+	outbound := &WireGuard{
+		Base: &Base{
+			name:   option.Name,
+			addr:   net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
+			tp:     C.WireGuard,
+			udp:    option.UDP,
+			iface:  option.Interface,
+			rmark:  option.RoutingMark,
+			prefer: C.NewDNSPrefer(option.IPVersion),
+		},
+		dialer: &wgSingDialer{dialer: dialer.NewDialer()},
+	}
+	runtime.SetFinalizer(outbound, closeWireGuard)
+
+	var reserved [3]uint8
+	if len(option.Reserved) > 0 {
+		if len(option.Reserved) != 3 {
+			return nil, E.New("invalid reserved value, required 3 bytes, got ", len(option.Reserved))
+		}
+		copy(reserved[:], option.Reserved)
+	}
+	var isConnect bool
+	var connectAddr M.Socksaddr
+	if len(option.Peers) < 2 {
+		isConnect = true
+		if len(option.Peers) == 1 {
+			connectAddr = option.Peers[0].Addr()
+		} else {
+			connectAddr = option.Addr()
+		}
+	}
+	outbound.bind = wireguard.NewClientBind(context.Background(), outbound.dialer, isConnect, connectAddr, reserved)
+
+	var localPrefixes []netip.Prefix
+
+	var privateKey string
 	{
 		bytes, err := base64.StdEncoding.DecodeString(option.PrivateKey)
 		if err != nil {
@@ -138,6 +163,52 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 		}
 		privateKey = hex.EncodeToString(bytes)
 	}
+	ipcConf := "private_key=" + privateKey
+	if peersLen := len(option.Peers); peersLen > 0 {
+		localPrefixes = make([]netip.Prefix, 0, peersLen*2)
+		for i, peer := range option.Peers {
+			var peerPublicKey, preSharedKey string
+			{
+				bytes, err := base64.StdEncoding.DecodeString(peer.PublicKey)
+				if err != nil {
+					return nil, E.Cause(err, "decode public key for peer ", i)
+				}
+				peerPublicKey = hex.EncodeToString(bytes)
+			}
+			if peer.PreSharedKey != "" {
+				bytes, err := base64.StdEncoding.DecodeString(peer.PreSharedKey)
+				if err != nil {
+					return nil, E.Cause(err, "decode pre shared key for peer ", i)
+				}
+				preSharedKey = hex.EncodeToString(bytes)
+			}
+			destination := peer.Addr()
+			ipcConf += "\npublic_key=" + peerPublicKey
+			ipcConf += "\nendpoint=" + destination.String()
+			if preSharedKey != "" {
+				ipcConf += "\npreshared_key=" + preSharedKey
+			}
+			if len(peer.AllowedIPs) == 0 {
+				return nil, E.New("missing allowed_ips for peer ", i)
+			}
+			for _, allowedIP := range peer.AllowedIPs {
+				ipcConf += "\nallowed_ip=" + allowedIP
+			}
+			if len(peer.Reserved) > 0 {
+				if len(peer.Reserved) != 3 {
+					return nil, E.New("invalid reserved value for peer ", i, ", required 3 bytes, got ", len(peer.Reserved))
+				}
+				copy(reserved[:], option.Reserved)
+				outbound.bind.SetReservedForEndpoint(destination, reserved)
+			}
+			prefixes, err := peer.Prefixes()
+			if err != nil {
+				return nil, err
+			}
+			localPrefixes = append(localPrefixes, prefixes...)
+		}
+	} else {
+		var peerPublicKey, preSharedKey string
 		{
 			bytes, err := base64.StdEncoding.DecodeString(option.PublicKey)
 			if err != nil {
@@ -152,12 +223,16 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 			}
 			preSharedKey = hex.EncodeToString(bytes)
 		}
-	ipcConf := "private_key=" + privateKey
 		ipcConf += "\npublic_key=" + peerPublicKey
-	ipcConf += "\nendpoint=" + peerAddr.String()
+		ipcConf += "\nendpoint=" + connectAddr.String()
 		if preSharedKey != "" {
 			ipcConf += "\npreshared_key=" + preSharedKey
 		}
+		var err error
+		localPrefixes, err = option.Prefixes()
+		if err != nil {
+			return nil, err
+		}
 		var has4, has6 bool
 		for _, address := range localPrefixes {
 			if address.Addr().Is4() {
@@ -172,6 +247,8 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 		if has6 {
 			ipcConf += "\nallowed_ip=::/0"
 		}
+	}
+
 	if option.PersistentKeepalive != 0 {
 		ipcConf += fmt.Sprintf("\npersistent_keepalive_interval=%d", option.PersistentKeepalive)
 	}
@@ -179,6 +256,9 @@ func NewWireGuard(option WireGuardOption) (*WireGuard, error) {
 	if mtu == 0 {
 		mtu = 1408
 	}
+	if len(localPrefixes) == 0 {
+		return nil, E.New("missing local address")
+	}
 	var err error
 	outbound.tunDevice, err = wireguard.NewStackDevice(localPrefixes, uint32(mtu))
 	if err != nil {

docs/config.yaml

@@ -620,12 +620,23 @@ proxies: # socks5
     port: 2480
     ip: 172.16.0.2
     ipv6: fd01:5ca1:ab1e:80fa:ab85:6eea:213f:f4a5
-    private-key: eCtXsJZ27+4PbhDkHnB923tkUn2Gj59wZw5wFA75MnU=
     public-key: Cr8hWlKvtDt7nrvf+f0brNQQzabAqrjfBvas9pmowjo=
+    #    pre-shared-key: 31aIhAPwktDGpH4JDhA8GNvjFXEf/a6+UaQRyOAiyfM=
+    private-key: eCtXsJZ27+4PbhDkHnB923tkUn2Gj59wZw5wFA75MnU=
     udp: true
     reserved: "U4An"
     # 数组格式也是合法的
     # reserved: [209,98,59]
+    # 如果peers不为空，该段落中的allowed_ips不可为空；前面段落的server,port,ip,ipv6,public-key,pre-shared-key均会被忽略，但private-key会被保留且只能在顶层指定
+    # peers:
+    #   - server: 162.159.192.1
+    #     port: 2480
+    #     ip: 172.16.0.2
+    #     ipv6: fd01:5ca1:ab1e:80fa:ab85:6eea:213f:f4a5
+    #     public-key: Cr8hWlKvtDt7nrvf+f0brNQQzabAqrjfBvas9pmowjo=
+    #     # pre-shared-key: 31aIhAPwktDGpH4JDhA8GNvjFXEf/a6+UaQRyOAiyfM=
+    #     allowed_ips: ['0.0.0.0/0']
+    #     reserved: [209,98,59]
   
   # tuic
   - name: tuic