Feature: Exclude some domains in sniffing destOverride (#151)

Co-authored-by: RPRX <[email protected]>

app/dispatcher/default.go

@@ -175,12 +175,21 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 	return inboundLink, outboundLink
 }
 
-func shouldOverride(result SniffResult, domainOverride []string) bool {
-	for _, p := range domainOverride {
-		if strings.HasPrefix(result.Protocol(), p) {
+func shouldOverride(result SniffResult, request session.SniffingRequest) bool {
+	domain := result.Domain()
+	for _, d := range request.ExcludeForDomain {
+		if domain == d {
+			return false
+		}
+	}
+
+	protocol := result.Protocol()
+	for _, p := range request.OverrideDestinationForProtocol {
+		if strings.HasPrefix(protocol, p) {
 			return true
 		}
 	}
+
 	return false
 }
 
@@ -213,7 +222,7 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 			if err == nil {
 				content.Protocol = result.Protocol()
 			}
-			if err == nil && shouldOverride(result, sniffingRequest.OverrideDestinationForProtocol) {
+			if err == nil && shouldOverride(result, sniffingRequest) {
 				domain := result.Domain()
 				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 				destination.Address = net.ParseAddress(domain)

app/proxyman/config.pb.go

@@ -241,6 +241,7 @@ type SniffingConfig struct {
 	// Override target destination if sniff'ed protocol is in the given list.
 	// Supported values are "http", "tls".
 	DestinationOverride []string `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
+	DomainsExcluded     []string `protobuf:"bytes,3,rep,name=domains_excluded,json=domainsExcluded,proto3" json:"domains_excluded,omitempty"`
 }
 
 func (x *SniffingConfig) Reset() {
@@ -289,6 +290,13 @@ func (x *SniffingConfig) GetDestinationOverride() []string {
 	return nil
 }
 
+func (x *SniffingConfig) GetDomainsExcluded() []string {
+	if x != nil {
+		return x.DomainsExcluded
+	}
+	return nil
+}
+
 type ReceiverConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -756,92 +764,95 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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+	0x33,
 }
 
 var (

app/proxyman/config.proto

@@ -56,6 +56,7 @@ message SniffingConfig {
   // Override target destination if sniff'ed protocol is in the given list.
   // Supported values are "http", "tls".
   repeated string destination_override = 2;
+  repeated string domains_excluded = 3;
 }
 
 message ReceiverConfig {

app/proxyman/inbound/worker.go

@@ -97,6 +97,7 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
@@ -449,6 +450,7 @@ func (w *dsWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
 	}
 	ctx = session.ContextWithContent(ctx, content)
 

common/session/session.go

@@ -60,6 +60,7 @@ type Outbound struct {
 
 // SniffingRequest controls the behavior of content sniffing.
 type SniffingRequest struct {
+	ExcludeForDomain               []string
 	OverrideDestinationForProtocol []string
 	Enabled                        bool
 }

infra/conf/xray.go

@@ -58,29 +58,38 @@ func toProtocolList(s []string) ([]proxyman.KnownProtocols, error) {
 }
 
 type SniffingConfig struct {
-	Enabled      bool        `json:"enabled"`
-	DestOverride *StringList `json:"destOverride"`
+	Enabled         bool        `json:"enabled"`
+	DestOverride    *StringList `json:"destOverride"`
+	DomainsExcluded *StringList `json:"domainsExcluded"`
 }
 
 // Build implements Buildable.
 func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 	var p []string
 	if c.DestOverride != nil {
-		for _, domainOverride := range *c.DestOverride {
-			switch strings.ToLower(domainOverride) {
+		for _, protocol := range *c.DestOverride {
+			switch strings.ToLower(protocol) {
 			case "http":
 				p = append(p, "http")
 			case "tls", "https", "ssl":
 				p = append(p, "tls")
 			default:
-				return nil, newError("unknown protocol: ", domainOverride)
+				return nil, newError("unknown protocol: ", protocol)
 			}
 		}
 	}
 
+	var d []string
+	if c.DomainsExcluded != nil {
+		for _, domain := range *c.DomainsExcluded {
+			d = append(d, strings.ToLower(domain))
+		}
+	}
+
 	return &proxyman.SniffingConfig{
 		Enabled:             c.Enabled,
 		DestinationOverride: p,
+		DomainsExcluded:     d,
 	}, nil
 }