DNS: add clientip for specific nameserver (#504)

app/dns/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.13.0
+// 	protoc        v3.14.0
 // source: app/dns/config.proto
 
 package dns
@@ -85,6 +85,7 @@ type NameServer struct {
 	unknownFields protoimpl.UnknownFields
 
 	Address           *net.Endpoint                `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	ClientIp          []byte                       `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"`
 	PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
 	Geoip             []*router.GeoIP              `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
 	OriginalRules     []*NameServer_OriginalRule   `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
@@ -129,6 +130,13 @@ func (x *NameServer) GetAddress() *net.Endpoint {
 	return nil
 }
 
+func (x *NameServer) GetClientIp() []byte {
+	if x != nil {
+		return x.ClientIp
+	}
+	return nil
+}
+
 func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
 	if x != nil {
 		return x.PrioritizedDomain
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+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/dns/config.proto

@@ -12,6 +12,7 @@ import "app/router/config.proto";
 
 message NameServer {
   v2ray.core.common.net.Endpoint address = 1;
+  bytes client_ip = 5;
 
   message PriorityDomain {
     DomainMatchingType type = 1;

app/dns/dohdns.go

@@ -44,6 +44,7 @@ type DoHNameServer struct {
 // NewDoHNameServer creates DOH client object for remote resolving
 func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.IP) (*DoHNameServer, error) {
 	newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
+	newError("DNS: Remote DOH client ", url.String(), " use clientip ", clientIP.String()).AtInfo().WriteToLog()
 	s := baseDOHNameServer(url, "DOH", clientIP)
 
 	// Dispatched connection will be closed (interrupted) after each request
@@ -107,6 +108,7 @@ func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
 		Transport: tr,
 	}
 	newError("DNS: created Local DOH client for ", url.String()).AtInfo().WriteToLog()
+	newError("DNS: Local DOH client ", url.String(), " use clientip ", clientIP.String()).AtInfo().WriteToLog()
 	return s
 }
 

app/dns/server.go

@@ -98,6 +98,13 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 		endpoint := ns.Address
 		address := endpoint.Address.AsAddress()
 
+		var myClientIP net.IP
+		if len(ns.ClientIp) == net.IPv4len || len(ns.ClientIp) == net.IPv6len {
+			myClientIP = net.IP(ns.ClientIp)
+		} else {
+			myClientIP = server.clientIP
+		}
+
 		switch {
 		case address.Family().IsDomain() && address.Domain() == "localhost":
 			server.clients = append(server.clients, NewLocalNameServer())
@@ -125,7 +132,7 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 			if err != nil {
 				log.Fatalln(newError("DNS config error").Base(err))
 			}
-			server.clients = append(server.clients, NewDoHLocalNameServer(u, server.clientIP))
+			server.clients = append(server.clients, NewDoHLocalNameServer(u, myClientIP))
 
 		case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https://"):
 			// DOH Remote mode
@@ -138,7 +145,7 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 
 			// need the core dispatcher, register DOHClient at callback
 			common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
-				c, err := NewDoHNameServer(u, d, server.clientIP)
+				c, err := NewDoHNameServer(u, d, myClientIP)
 				if err != nil {
 					log.Fatalln(newError("DNS config error").Base(err))
 				}
@@ -156,7 +163,7 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 				server.clients = append(server.clients, nil)
 
 				common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
-					server.clients[idx] = NewClassicNameServer(dest, d, server.clientIP)
+					server.clients[idx] = NewClassicNameServer(dest, d, myClientIP)
 				}))
 			}
 		}

app/dns/udpns.go

@@ -54,7 +54,8 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 		Execute:  s.Cleanup,
 	}
 	s.udpServer = udp.NewDispatcher(dispatcher, s.HandleResponse)
-	newError("DNS: created udp client inited for ", address.NetAddr()).AtInfo().WriteToLog()
+	newError("DNS: created UDP client inited for ", address.NetAddr()).AtInfo().WriteToLog()
+	newError("DNS: UDP client ", address.NetAddr(), " use clientip ", clientIP.String()).AtInfo().WriteToLog()
 	return s
 }
 

infra/conf/dns.go

@@ -12,6 +12,7 @@ import (
 
 type NameServerConfig struct {
 	Address   *Address
+	ClientIP  *Address
 	Port      uint16
 	Domains   []string
 	ExpectIPs StringList
@@ -26,12 +27,14 @@ func (c *NameServerConfig) UnmarshalJSON(data []byte) error {
 
 	var advanced struct {
 		Address   *Address   `json:"address"`
+		ClientIP  *Address   `json:"clientIp"`
 		Port      uint16     `json:"port"`
 		Domains   []string   `json:"domains"`
 		ExpectIPs StringList `json:"expectIps"`
 	}
 	if err := json.Unmarshal(data, &advanced); err == nil {
 		c.Address = advanced.Address
+		c.ClientIP = advanced.ClientIP
 		c.Port = advanced.Port
 		c.Domains = advanced.Domains
 		c.ExpectIPs = advanced.ExpectIPs
@@ -87,12 +90,21 @@ func (c *NameServerConfig) Build() (*dns.NameServer, error) {
 		return nil, newError("invalid ip rule: ", c.ExpectIPs).Base(err)
 	}
 
+	var myClientIP []byte
+	if c.ClientIP != nil {
+		if !c.ClientIP.Family().IsIP() {
+			return nil, newError("not an IP address:", c.ClientIP.String())
+		}
+		myClientIP = []byte(c.ClientIP.IP())
+	}
+
 	return &dns.NameServer{
 		Address: &net.Endpoint{
 			Network: net.Network_UDP,
 			Address: c.Address.Build(),
 			Port:    uint32(c.Port),
 		},
+		ClientIp:          myClientIP,
 		PrioritizedDomain: domains,
 		Geoip:             geoipList,
 		OriginalRules:     originalRules,

infra/conf/dns_test.go

@@ -45,6 +45,7 @@ func init() {
 	common.Must(err)
 	common.Must2(geositeFile.Write(listBytes))
 }
+
 func TestDNSConfigParsing(t *testing.T) {
 	geositePath := platform.GetAssetLocation("geosite.dat")
 	defer func() {
@@ -67,6 +68,7 @@ func TestDNSConfigParsing(t *testing.T) {
 			Input: `{
 				"servers": [{
 					"address": "8.8.8.8",
+					"clientIp": "10.0.0.1",
 					"port": 5353,
 					"domains": ["domain:v2ray.com"]
 				}],
@@ -92,6 +94,7 @@ func TestDNSConfigParsing(t *testing.T) {
 							Network: net.Network_UDP,
 							Port:    5353,
 						},
+						ClientIp: []byte{10, 0, 0, 1},
 						PrioritizedDomain: []*dns.NameServer_PriorityDomain{
 							{
 								Type:   dns.DomainMatchingType_Subdomain,