Allow to send through random IPv6

app/proxyman/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.33.0
-// 	protoc        v4.23.1
+// 	protoc        v5.26.0
 // source: app/proxyman/config.proto
 
 package proxyman
@@ -524,6 +524,7 @@ type SenderConfig struct {
 	StreamSettings    *internet.StreamConfig `protobuf:"bytes,2,opt,name=stream_settings,json=streamSettings,proto3" json:"stream_settings,omitempty"`
 	ProxySettings     *internet.ProxyConfig  `protobuf:"bytes,3,opt,name=proxy_settings,json=proxySettings,proto3" json:"proxy_settings,omitempty"`
 	MultiplexSettings *MultiplexingConfig    `protobuf:"bytes,4,opt,name=multiplex_settings,json=multiplexSettings,proto3" json:"multiplex_settings,omitempty"`
+	ViaCidr           string                 `protobuf:"bytes,5,opt,name=via_cidr,json=viaCidr,proto3" json:"via_cidr,omitempty"`
 }
 
 func (x *SenderConfig) Reset() {
@@ -586,6 +587,13 @@ func (x *SenderConfig) GetMultiplexSettings() *MultiplexingConfig {
 	return nil
 }
 
+func (x *SenderConfig) GetViaCidr() string {
+	if x != nil {
+		return x.ViaCidr
+	}
+	return ""
+}
+
 type MultiplexingConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -855,7 +863,7 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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@@ -874,26 +882,28 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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 }
 
 var (

app/proxyman/config.proto

@@ -91,6 +91,7 @@ message SenderConfig {
   xray.transport.internet.StreamConfig stream_settings = 2;
   xray.transport.internet.ProxyConfig proxy_settings = 3;
   MultiplexingConfig multiplex_settings = 4;
+  string via_cidr = 5;
 }
 
 message MultiplexingConfig {

app/proxyman/outbound/handler.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"errors"
 	"io"
+	"math/rand"
+	gonet "net"
 	"os"
 
 	"github.com/xtls/xray-core/app/proxyman"
@@ -269,7 +271,11 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connecti
 				outbound = new(session.Outbound)
 				ctx = session.ContextWithOutbound(ctx, outbound)
 			}
+			if h.senderSettings.ViaCidr == "" {
 				outbound.Gateway = h.senderSettings.Via.AsAddress()
+			} else { //Get a random address.
+				outbound.Gateway = ParseRandomIPv6(h.senderSettings.Via.AsAddress(), h.senderSettings.ViaCidr)
+			}
 		}
 	}
 
@@ -312,3 +318,17 @@ func (h *Handler) Close() error {
 	common.Close(h.mux)
 	return nil
 }
+
+// Return random IPv6 in a CIDR block
+func ParseRandomIPv6(address net.Address, prefix string) net.Address {
+	addr := address.IP().String()
+	_, network, _ := gonet.ParseCIDR(addr + "/" + prefix)
+
+	ipv6 := network.IP.To16()
+	prefixLen, _ := network.Mask.Size()
+	for i := prefixLen / 8; i < 16; i++ {
+		ipv6[i] = byte(rand.Intn(256))
+	}
+
+	return net.ParseAddress(gonet.IP(ipv6).String())
+}

infra/conf/xray.go

@@ -11,6 +11,7 @@ import (
 	"github.com/xtls/xray-core/app/dispatcher"
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/app/stats"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/transport/internet"
@@ -279,7 +280,7 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 
 type OutboundDetourConfig struct {
 	Protocol      string           `json:"protocol"`
-	SendThrough   *Address         `json:"sendThrough"`
+	SendThrough   *string          `json:"sendThrough"`
 	Tag           string           `json:"tag"`
 	Settings      *json.RawMessage `json:"settings"`
 	StreamSetting *StreamConfig    `json:"streamSettings"`
@@ -305,10 +306,15 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	}
 
 	if c.SendThrough != nil {
-		address := c.SendThrough
+		address := ParseSendThough(c.SendThrough)
+		//Check if CIDR exists
+		if strings.Contains(*c.SendThrough, "/") {
+			senderSettings.ViaCidr = strings.Split(*c.SendThrough, "/")[1]
+		} else {
 			if address.Family().IsDomain() {
 				return nil, newError("unable to send through: " + address.String())
 			}
+		}
 		senderSettings.Via = address.Build()
 	}
 
@@ -717,3 +723,10 @@ func (c *Config) Build() (*core.Config, error) {
 
 	return config, nil
 }
+
+// Convert string to Address.
+func ParseSendThough(Addr *string) *Address {
+	var addr Address
+	addr.Address = net.ParseAddress(strings.Split(*Addr, "/")[0])
+	return &addr
+}