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- package mitm
- import (
- "bufio"
- "bytes"
- "context"
- "crypto/tls"
- "crypto/x509"
- "encoding/base64"
- "io"
- "math"
- "mime"
- "net"
- "net/http"
- "net/url"
- "os"
- "path/filepath"
- "strings"
- "time"
- "unicode"
- "github.com/sagernet/sing-box/adapter"
- "github.com/sagernet/sing-box/common/dialer"
- sTLS "github.com/sagernet/sing-box/common/tls"
- "github.com/sagernet/sing-box/option"
- "github.com/sagernet/sing/common"
- "github.com/sagernet/sing/common/atomic"
- E "github.com/sagernet/sing/common/exceptions"
- F "github.com/sagernet/sing/common/format"
- "github.com/sagernet/sing/common/logger"
- M "github.com/sagernet/sing/common/metadata"
- N "github.com/sagernet/sing/common/network"
- "github.com/sagernet/sing/common/ntp"
- sHTTP "github.com/sagernet/sing/protocol/http"
- "github.com/sagernet/sing/service"
- "golang.org/x/crypto/pkcs12"
- "golang.org/x/net/http2"
- )
- var _ adapter.MITMEngine = (*Engine)(nil)
- type Engine struct {
- ctx context.Context
- logger logger.ContextLogger
- connection adapter.ConnectionManager
- script adapter.ScriptManager
- timeFunc func() time.Time
- http2Enabled bool
- tlsDecryptionEnabled bool
- tlsPrivateKey any
- tlsCertificate *x509.Certificate
- }
- func NewEngine(ctx context.Context, logger logger.ContextLogger, options option.MITMOptions) (*Engine, error) {
- engine := &Engine{
- ctx: ctx,
- logger: logger,
- http2Enabled: options.HTTP2Enabled,
- }
- if options.TLSDecryptionOptions != nil && options.TLSDecryptionOptions.Enabled {
- pfxBytes, err := base64.StdEncoding.DecodeString(options.TLSDecryptionOptions.KeyPair)
- if err != nil {
- return nil, E.Cause(err, "decode key pair base64 bytes")
- }
- privateKey, certificate, err := pkcs12.Decode(pfxBytes, options.TLSDecryptionOptions.KeyPassword)
- if err != nil {
- return nil, E.Cause(err, "decode key pair")
- }
- engine.tlsDecryptionEnabled = true
- engine.tlsPrivateKey = privateKey
- engine.tlsCertificate = certificate
- }
- return engine, nil
- }
- func (e *Engine) Start(stage adapter.StartStage) error {
- switch stage {
- case adapter.StartStateInitialize:
- e.connection = service.FromContext[adapter.ConnectionManager](e.ctx)
- e.script = service.FromContext[adapter.ScriptManager](e.ctx)
- e.timeFunc = ntp.TimeFuncFromContext(e.ctx)
- if e.timeFunc == nil {
- e.timeFunc = time.Now
- }
- }
- return nil
- }
- func (e *Engine) Close() error {
- return nil
- }
- func (e *Engine) ExportCertificate() *x509.Certificate {
- return e.tlsCertificate
- }
- func (e *Engine) NewConnection(ctx context.Context, this N.Dialer, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) {
- if e.tlsDecryptionEnabled && metadata.ClientHello != nil {
- err := e.newTLS(ctx, this, conn, metadata, onClose)
- if err != nil {
- e.logger.ErrorContext(ctx, err)
- } else {
- e.logger.DebugContext(ctx, "connection closed")
- }
- if onClose != nil {
- onClose(err)
- }
- return
- } else if metadata.HTTPRequest != nil {
- err := e.newHTTP1(ctx, this, conn, nil, metadata)
- if err != nil {
- e.logger.ErrorContext(ctx, err)
- } else {
- e.logger.DebugContext(ctx, "connection closed")
- }
- if onClose != nil {
- onClose(err)
- }
- return
- } else {
- e.logger.DebugContext(ctx, "HTTP and TLS not detected, skipped")
- }
- metadata.MITM = nil
- e.connection.NewConnection(ctx, this, conn, metadata, onClose)
- }
- func (e *Engine) newTLS(ctx context.Context, this N.Dialer, conn net.Conn, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
- acceptHTTP := len(metadata.ClientHello.SupportedProtos) == 0 || common.Contains(metadata.ClientHello.SupportedProtos, "http/1.1")
- acceptH2 := e.http2Enabled && common.Contains(metadata.ClientHello.SupportedProtos, "h2")
- if !acceptHTTP && !acceptH2 {
- metadata.MITM = nil
- e.logger.DebugContext(ctx, "unsupported application protocol: ", strings.Join(metadata.ClientHello.SupportedProtos, ","))
- e.connection.NewConnection(ctx, this, conn, metadata, onClose)
- return nil
- }
- var nextProtos []string
- if acceptH2 {
- nextProtos = append(nextProtos, "h2")
- } else if acceptHTTP {
- nextProtos = append(nextProtos, "http/1.1")
- }
- var (
- maxVersion uint16
- minVersion uint16
- )
- for _, version := range metadata.ClientHello.SupportedVersions {
- maxVersion = common.Max(maxVersion, version)
- minVersion = common.Min(minVersion, version)
- }
- serverName := metadata.ClientHello.ServerName
- if serverName == "" && metadata.Destination.IsIP() {
- serverName = metadata.Destination.Addr.String()
- }
- tlsConfig := &tls.Config{
- Time: e.timeFunc,
- ServerName: serverName,
- NextProtos: nextProtos,
- MinVersion: minVersion,
- MaxVersion: maxVersion,
- GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
- return sTLS.GenerateKeyPair(e.tlsCertificate, e.tlsPrivateKey, e.timeFunc, serverName)
- },
- }
- tlsConn := tls.Server(conn, tlsConfig)
- err := tlsConn.HandshakeContext(ctx)
- if err != nil {
- return E.Cause(err, "TLS handshake failed for ", metadata.ClientHello.ServerName, ", ", strings.Join(metadata.ClientHello.SupportedProtos, ", "))
- }
- if tlsConn.ConnectionState().NegotiatedProtocol == "h2" {
- return e.newHTTP2(ctx, this, tlsConn, tlsConfig, metadata, onClose)
- } else {
- return e.newHTTP1(ctx, this, tlsConn, tlsConfig, metadata)
- }
- }
- func (e *Engine) newHTTP1(ctx context.Context, this N.Dialer, conn net.Conn, tlsConfig *tls.Config, metadata adapter.InboundContext) error {
- options := metadata.MITM
- defer conn.Close()
- reader := bufio.NewReader(conn)
- request, err := sHTTP.ReadRequest(reader)
- if err != nil {
- return E.Cause(err, "read HTTP request")
- }
- rawRequestURL := request.URL
- if tlsConfig != nil {
- rawRequestURL.Scheme = "https"
- } else {
- rawRequestURL.Scheme = "http"
- }
- if rawRequestURL.Host == "" {
- rawRequestURL.Host = request.Host
- }
- requestURL := rawRequestURL.String()
- request.RequestURI = ""
- var (
- requestMatch bool
- requestScript adapter.SurgeScript
- requestScriptOptions option.MITMRouteSurgeScriptOptions
- )
- match:
- for _, scriptOptions := range options.Script {
- script, loaded := e.script.Script(scriptOptions.Tag)
- if !loaded {
- e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
- continue
- }
- surgeScript, isSurge := script.(adapter.SurgeScript)
- if !isSurge {
- e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
- continue
- }
- for _, pattern := range scriptOptions.Pattern {
- if pattern.Build().MatchString(requestURL) {
- e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
- requestScript = surgeScript
- requestScriptOptions = scriptOptions
- requestMatch = true
- break match
- }
- }
- }
- var body []byte
- if options.Print && request.ContentLength > 0 && request.ContentLength <= 131072 {
- body, err = io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- request.Body = io.NopCloser(bytes.NewReader(body))
- }
- if options.Print {
- e.printRequest(ctx, request, body)
- }
- if requestScript != nil {
- if body == nil && requestScriptOptions.RequiresBody && request.ContentLength > 0 && (requestScriptOptions.MaxSize == 0 && request.ContentLength <= 131072 || request.ContentLength <= requestScriptOptions.MaxSize) {
- body, err = io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- request.Body = io.NopCloser(bytes.NewReader(body))
- }
- var result *adapter.HTTPRequestScriptResult
- result, err = requestScript.ExecuteHTTPRequest(ctx, time.Duration(requestScriptOptions.Timeout), request, body, requestScriptOptions.BinaryBodyMode, requestScriptOptions.Arguments)
- if err != nil {
- return E.Cause(err, "execute script/", requestScript.Type(), "[", requestScript.Tag(), "]")
- }
- if result.Response != nil {
- if result.Response.Status == 0 {
- result.Response.Status = http.StatusOK
- }
- response := &http.Response{
- StatusCode: result.Response.Status,
- Status: http.StatusText(result.Response.Status),
- Proto: request.Proto,
- ProtoMajor: request.ProtoMajor,
- ProtoMinor: request.ProtoMinor,
- Header: result.Response.Headers,
- Body: io.NopCloser(bytes.NewReader(result.Response.Body)),
- }
- err = response.Write(conn)
- if err != nil {
- return E.Cause(err, "write fake response body")
- }
- return nil
- } else {
- if result.URL != "" {
- var newURL *url.URL
- newURL, err = url.Parse(result.URL)
- if err != nil {
- return E.Cause(err, "parse updated request URL")
- }
- request.URL = newURL
- newDestination := M.ParseSocksaddrHostPortStr(newURL.Hostname(), newURL.Port())
- if newDestination.Port == 0 {
- newDestination.Port = metadata.Destination.Port
- }
- metadata.Destination = newDestination
- if tlsConfig != nil {
- tlsConfig.ServerName = newURL.Hostname()
- }
- }
- for key, values := range result.Headers {
- request.Header[key] = values
- }
- if newHost := result.Headers.Get("Host"); newHost != "" {
- request.Host = newHost
- request.Header.Del("Host")
- }
- if result.Body != nil {
- body = result.Body
- request.Body = io.NopCloser(bytes.NewReader(body))
- request.ContentLength = int64(len(body))
- }
- }
- }
- if !requestMatch {
- for i, rule := range options.SurgeURLRewrite {
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- e.logger.DebugContext(ctx, "match url_rewrite[", i, "] => ", rule.String())
- if rule.Reject {
- return E.New("request rejected by url_rewrite")
- } else if rule.Redirect {
- w := new(simpleResponseWriter)
- http.Redirect(w, request, rule.Destination.String(), http.StatusFound)
- err = w.Build(request).Write(conn)
- if err != nil {
- return E.Cause(err, "write url_rewrite 302 response")
- }
- return nil
- }
- requestMatch = true
- request.URL = rule.Destination
- newDestination := M.ParseSocksaddrHostPortStr(rule.Destination.Hostname(), rule.Destination.Port())
- if newDestination.Port == 0 {
- newDestination.Port = metadata.Destination.Port
- }
- metadata.Destination = newDestination
- if tlsConfig != nil {
- tlsConfig.ServerName = rule.Destination.Hostname()
- }
- break
- }
- for i, rule := range options.SurgeHeaderRewrite {
- if rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
- switch {
- case rule.Add:
- if strings.ToLower(rule.Key) == "host" {
- request.Host = rule.Value
- continue
- }
- request.Header.Add(rule.Key, rule.Value)
- case rule.Delete:
- request.Header.Del(rule.Key)
- case rule.Replace:
- if request.Header.Get(rule.Key) != "" {
- request.Header.Set(rule.Key, rule.Value)
- }
- case rule.ReplaceRegex:
- if value := request.Header.Get(rule.Key); value != "" {
- request.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
- }
- }
- }
- for i, rule := range options.SurgeBodyRewrite {
- if rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
- if body == nil {
- if request.ContentLength <= 0 {
- e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
- break
- } else if request.ContentLength > 131072 {
- e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
- break
- }
- body, err = io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- }
- for mi := 0; i < len(rule.Match); i++ {
- body = rule.Match[mi].ReplaceAll(body, []byte(rule.Replace[i]))
- }
- request.Body = io.NopCloser(bytes.NewReader(body))
- request.ContentLength = int64(len(body))
- }
- }
- if !requestMatch {
- for i, rule := range options.SurgeMapLocal {
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match map_local[", i, "] => ", rule.String())
- var (
- statusCode = http.StatusOK
- headers = make(http.Header)
- )
- if rule.StatusCode > 0 {
- statusCode = rule.StatusCode
- }
- switch {
- case rule.File:
- resource, err := os.ReadFile(rule.Data)
- if err != nil {
- return E.Cause(err, "open map local source")
- }
- mimeType := mime.TypeByExtension(filepath.Ext(rule.Data))
- if mimeType == "" {
- mimeType = "application/octet-stream"
- }
- headers.Set("Content-Type", mimeType)
- body = resource
- case rule.Text:
- headers.Set("Content-Type", "text/plain")
- body = []byte(rule.Data)
- case rule.TinyGif:
- headers.Set("Content-Type", "image/gif")
- body = surgeTinyGif()
- case rule.Base64:
- headers.Set("Content-Type", "application/octet-stream")
- body = rule.Base64Data
- }
- response := &http.Response{
- StatusCode: statusCode,
- Status: http.StatusText(statusCode),
- Proto: request.Proto,
- ProtoMajor: request.ProtoMajor,
- ProtoMinor: request.ProtoMinor,
- Header: headers,
- Body: io.NopCloser(bytes.NewReader(body)),
- }
- err = response.Write(conn)
- if err != nil {
- return E.Cause(err, "write map local response")
- }
- return nil
- }
- }
- ctx = adapter.WithContext(ctx, &metadata)
- var innerErr atomic.TypedValue[error]
- httpClient := &http.Client{
- Transport: &http.Transport{
- DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
- if len(metadata.DestinationAddresses) > 0 || metadata.Destination.IsIP() {
- return dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
- } else {
- return this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
- }
- },
- TLSClientConfig: tlsConfig,
- },
- CheckRedirect: func(req *http.Request, via []*http.Request) error {
- return http.ErrUseLastResponse
- },
- }
- defer httpClient.CloseIdleConnections()
- requestCtx, cancel := context.WithCancel(ctx)
- defer cancel()
- response, err := httpClient.Do(request.WithContext(requestCtx))
- if err != nil {
- cancel()
- return E.Errors(innerErr.Load(), err)
- }
- var (
- responseScript adapter.SurgeScript
- responseMatch bool
- responseScriptOptions option.MITMRouteSurgeScriptOptions
- )
- matchResponse:
- for _, scriptOptions := range options.Script {
- script, loaded := e.script.Script(scriptOptions.Tag)
- if !loaded {
- e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
- continue
- }
- surgeScript, isSurge := script.(adapter.SurgeScript)
- if !isSurge {
- e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
- continue
- }
- for _, pattern := range scriptOptions.Pattern {
- if pattern.Build().MatchString(requestURL) {
- e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
- responseScript = surgeScript
- responseScriptOptions = scriptOptions
- responseMatch = true
- break matchResponse
- }
- }
- }
- var responseBody []byte
- if options.Print && response.ContentLength > 0 && response.ContentLength <= 131072 {
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP response body")
- }
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- }
- if options.Print {
- e.printResponse(ctx, request, response, responseBody)
- }
- if responseScript != nil {
- if responseBody == nil && responseScriptOptions.RequiresBody && response.ContentLength > 0 && (responseScriptOptions.MaxSize == 0 && response.ContentLength <= 131072 || response.ContentLength <= responseScriptOptions.MaxSize) {
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP response body")
- }
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- }
- var result *adapter.HTTPResponseScriptResult
- result, err = responseScript.ExecuteHTTPResponse(ctx, time.Duration(responseScriptOptions.Timeout), request, response, responseBody, responseScriptOptions.BinaryBodyMode, responseScriptOptions.Arguments)
- if err != nil {
- return E.Cause(err, "execute script/", responseScript.Type(), "[", responseScript.Tag(), "]")
- }
- if result.Status > 0 {
- response.Status = http.StatusText(result.Status)
- response.StatusCode = result.Status
- }
- for key, values := range result.Headers {
- response.Header[key] = values
- }
- if result.Body != nil {
- response.Body.Close()
- responseBody = result.Body
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- response.ContentLength = int64(len(responseBody))
- }
- }
- if !responseMatch {
- for i, rule := range options.SurgeHeaderRewrite {
- if !rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- responseMatch = true
- e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
- switch {
- case rule.Add:
- response.Header.Add(rule.Key, rule.Value)
- case rule.Delete:
- response.Header.Del(rule.Key)
- case rule.Replace:
- if response.Header.Get(rule.Key) != "" {
- response.Header.Set(rule.Key, rule.Value)
- }
- case rule.ReplaceRegex:
- if value := response.Header.Get(rule.Key); value != "" {
- response.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
- }
- }
- }
- for i, rule := range options.SurgeBodyRewrite {
- if !rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- responseMatch = true
- e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
- if responseBody == nil {
- if response.ContentLength <= 0 {
- e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
- break
- } else if response.ContentLength > 131072 {
- e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
- break
- }
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- }
- for mi := 0; i < len(rule.Match); i++ {
- responseBody = rule.Match[mi].ReplaceAll(responseBody, []byte(rule.Replace[i]))
- }
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- response.ContentLength = int64(len(responseBody))
- }
- }
- if !options.Print && !requestMatch && !responseMatch {
- e.logger.WarnContext(ctx, "request not modified")
- }
- err = response.Write(conn)
- if err != nil {
- return E.Errors(E.Cause(err, "write HTTP response"), innerErr.Load())
- } else if innerErr.Load() != nil {
- return E.Cause(innerErr.Load(), "write HTTP response")
- }
- return nil
- }
- func (e *Engine) newHTTP2(ctx context.Context, this N.Dialer, conn net.Conn, tlsConfig *tls.Config, metadata adapter.InboundContext, onClose N.CloseHandlerFunc) error {
- httpTransport := &http.Transport{
- ForceAttemptHTTP2: true,
- DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
- ctx = adapter.WithContext(ctx, &metadata)
- if len(metadata.DestinationAddresses) > 0 || metadata.Destination.IsIP() {
- return dialer.DialSerialNetwork(ctx, this, N.NetworkTCP, metadata.Destination, metadata.DestinationAddresses, metadata.NetworkStrategy, metadata.NetworkType, metadata.FallbackNetworkType, metadata.FallbackDelay)
- } else {
- return this.DialContext(ctx, N.NetworkTCP, metadata.Destination)
- }
- },
- TLSClientConfig: tlsConfig,
- }
- err := http2.ConfigureTransport(httpTransport)
- if err != nil {
- return E.Cause(err, "configure HTTP/2 transport")
- }
- handler := &engineHandler{
- Engine: e,
- conn: conn,
- tlsConfig: tlsConfig,
- dialer: this,
- metadata: metadata,
- httpClient: &http.Client{
- Transport: httpTransport,
- CheckRedirect: func(req *http.Request, via []*http.Request) error {
- return http.ErrUseLastResponse
- },
- },
- onClose: onClose,
- }
- http2Server := &http2.Server{
- MaxReadFrameSize: math.MaxUint32,
- }
- http2Server.ServeConn(conn, &http2.ServeConnOpts{
- Context: ctx,
- Handler: handler,
- })
- return nil
- }
- type engineHandler struct {
- *Engine
- conn net.Conn
- tlsConfig *tls.Config
- dialer N.Dialer
- metadata adapter.InboundContext
- onClose N.CloseHandlerFunc
- httpClient *http.Client
- }
- func (e *engineHandler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
- err := e.serveHTTP(request.Context(), writer, request)
- if err != nil {
- if E.IsClosedOrCanceled(err) {
- e.logger.DebugContext(request.Context(), E.Cause(err, "connection closed"))
- } else {
- e.logger.ErrorContext(request.Context(), err)
- }
- }
- }
- func (e *engineHandler) serveHTTP(ctx context.Context, writer http.ResponseWriter, request *http.Request) error {
- options := e.metadata.MITM
- rawRequestURL := request.URL
- rawRequestURL.Scheme = "https"
- if rawRequestURL.Host == "" {
- rawRequestURL.Host = request.Host
- }
- requestURL := rawRequestURL.String()
- request.RequestURI = ""
- var (
- requestMatch bool
- requestScript adapter.SurgeScript
- requestScriptOptions option.MITMRouteSurgeScriptOptions
- )
- match:
- for _, scriptOptions := range options.Script {
- script, loaded := e.script.Script(scriptOptions.Tag)
- if !loaded {
- e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
- continue
- }
- surgeScript, isSurge := script.(adapter.SurgeScript)
- if !isSurge {
- e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
- continue
- }
- for _, pattern := range scriptOptions.Pattern {
- if pattern.Build().MatchString(requestURL) {
- e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
- requestScript = surgeScript
- requestScriptOptions = scriptOptions
- requestMatch = true
- break match
- }
- }
- }
- var (
- body []byte
- err error
- )
- if options.Print && request.ContentLength > 0 && request.ContentLength <= 131072 {
- body, err = io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- request.Body.Close()
- request.Body = io.NopCloser(bytes.NewReader(body))
- }
- if options.Print {
- e.printRequest(ctx, request, body)
- }
- if requestScript != nil {
- if body == nil && requestScriptOptions.RequiresBody && request.ContentLength > 0 && (requestScriptOptions.MaxSize == 0 && request.ContentLength <= 131072 || request.ContentLength <= requestScriptOptions.MaxSize) {
- body, err = io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- request.Body.Close()
- request.Body = io.NopCloser(bytes.NewReader(body))
- }
- result, err := requestScript.ExecuteHTTPRequest(ctx, time.Duration(requestScriptOptions.Timeout), request, body, requestScriptOptions.BinaryBodyMode, requestScriptOptions.Arguments)
- if err != nil {
- return E.Cause(err, "execute script/", requestScript.Type(), "[", requestScript.Tag(), "]")
- }
- if result.Response != nil {
- if result.Response.Status == 0 {
- result.Response.Status = http.StatusOK
- }
- for key, values := range result.Response.Headers {
- writer.Header()[key] = values
- }
- writer.WriteHeader(result.Response.Status)
- if result.Response.Body != nil {
- _, err = writer.Write(result.Response.Body)
- if err != nil {
- return E.Cause(err, "write fake response body")
- }
- }
- return nil
- } else {
- if result.URL != "" {
- var newURL *url.URL
- newURL, err = url.Parse(result.URL)
- if err != nil {
- return E.Cause(err, "parse updated request URL")
- }
- request.URL = newURL
- newDestination := M.ParseSocksaddrHostPortStr(newURL.Hostname(), newURL.Port())
- if newDestination.Port == 0 {
- newDestination.Port = e.metadata.Destination.Port
- }
- e.metadata.Destination = newDestination
- e.tlsConfig.ServerName = newURL.Hostname()
- }
- for key, values := range result.Headers {
- request.Header[key] = values
- }
- if newHost := result.Headers.Get("Host"); newHost != "" {
- request.Host = newHost
- request.Header.Del("Host")
- }
- if result.Body != nil {
- io.Copy(io.Discard, request.Body)
- request.Body = io.NopCloser(bytes.NewReader(result.Body))
- request.ContentLength = int64(len(result.Body))
- }
- }
- }
- if !requestMatch {
- for i, rule := range options.SurgeURLRewrite {
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- e.logger.DebugContext(ctx, "match url_rewrite[", i, "] => ", rule.String())
- if rule.Reject {
- return E.New("request rejected by url_rewrite")
- } else if rule.Redirect {
- http.Redirect(writer, request, rule.Destination.String(), http.StatusFound)
- return nil
- }
- requestMatch = true
- request.URL = rule.Destination
- newDestination := M.ParseSocksaddrHostPortStr(rule.Destination.Hostname(), rule.Destination.Port())
- if newDestination.Port == 0 {
- newDestination.Port = e.metadata.Destination.Port
- }
- e.metadata.Destination = newDestination
- e.tlsConfig.ServerName = rule.Destination.Hostname()
- break
- }
- for i, rule := range options.SurgeHeaderRewrite {
- if rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
- switch {
- case rule.Add:
- if strings.ToLower(rule.Key) == "host" {
- request.Host = rule.Value
- continue
- }
- request.Header.Add(rule.Key, rule.Value)
- case rule.Delete:
- request.Header.Del(rule.Key)
- case rule.Replace:
- if request.Header.Get(rule.Key) != "" {
- request.Header.Set(rule.Key, rule.Value)
- }
- case rule.ReplaceRegex:
- if value := request.Header.Get(rule.Key); value != "" {
- request.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
- }
- }
- }
- for i, rule := range options.SurgeBodyRewrite {
- if rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
- var body []byte
- if request.ContentLength <= 0 {
- e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
- break
- } else if request.ContentLength > 131072 {
- e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
- break
- }
- body, err := io.ReadAll(request.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- request.Body.Close()
- for mi := 0; i < len(rule.Match); i++ {
- body = rule.Match[mi].ReplaceAll(body, []byte(rule.Replace[i]))
- }
- request.Body = io.NopCloser(bytes.NewReader(body))
- request.ContentLength = int64(len(body))
- }
- }
- if !requestMatch {
- for i, rule := range options.SurgeMapLocal {
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- requestMatch = true
- e.logger.DebugContext(ctx, "match map_local[", i, "] => ", rule.String())
- go func() {
- io.Copy(io.Discard, request.Body)
- request.Body.Close()
- }()
- var (
- statusCode = http.StatusOK
- headers = make(http.Header)
- body []byte
- )
- if rule.StatusCode > 0 {
- statusCode = rule.StatusCode
- }
- switch {
- case rule.File:
- resource, err := os.ReadFile(rule.Data)
- if err != nil {
- return E.Cause(err, "open map local source")
- }
- mimeType := mime.TypeByExtension(filepath.Ext(rule.Data))
- if mimeType == "" {
- mimeType = "application/octet-stream"
- }
- headers.Set("Content-Type", mimeType)
- body = resource
- case rule.Text:
- headers.Set("Content-Type", "text/plain")
- body = []byte(rule.Data)
- case rule.TinyGif:
- headers.Set("Content-Type", "image/gif")
- body = surgeTinyGif()
- case rule.Base64:
- headers.Set("Content-Type", "application/octet-stream")
- body = rule.Base64Data
- }
- for key, values := range headers {
- writer.Header()[key] = values
- }
- writer.WriteHeader(statusCode)
- _, err = writer.Write(body)
- if err != nil {
- return E.Cause(err, "write map local response")
- }
- return nil
- }
- }
- requestCtx, cancel := context.WithCancel(ctx)
- defer cancel()
- response, err := e.httpClient.Do(request.WithContext(requestCtx))
- if err != nil {
- cancel()
- return E.Cause(err, "exchange request")
- }
- var (
- responseScript adapter.SurgeScript
- responseMatch bool
- responseScriptOptions option.MITMRouteSurgeScriptOptions
- )
- matchResponse:
- for _, scriptOptions := range options.Script {
- script, loaded := e.script.Script(scriptOptions.Tag)
- if !loaded {
- e.logger.WarnContext(ctx, "script not found: ", scriptOptions.Tag)
- continue
- }
- surgeScript, isSurge := script.(adapter.SurgeScript)
- if !isSurge {
- e.logger.WarnContext(ctx, "specified script/", script.Type(), "[", script.Tag(), "] is not a Surge script")
- continue
- }
- for _, pattern := range scriptOptions.Pattern {
- if pattern.Build().MatchString(requestURL) {
- e.logger.DebugContext(ctx, "match script/", surgeScript.Type(), "[", surgeScript.Tag(), "]")
- responseScript = surgeScript
- responseScriptOptions = scriptOptions
- responseMatch = true
- break matchResponse
- }
- }
- }
- var responseBody []byte
- if options.Print && response.ContentLength > 0 && response.ContentLength <= 131072 {
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP response body")
- }
- response.Body.Close()
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- }
- if options.Print {
- e.printResponse(ctx, request, response, responseBody)
- }
- if responseScript != nil {
- if responseBody == nil && responseScriptOptions.RequiresBody && response.ContentLength > 0 && (responseScriptOptions.MaxSize == 0 && response.ContentLength <= 131072 || response.ContentLength <= responseScriptOptions.MaxSize) {
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP response body")
- }
- response.Body.Close()
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- }
- var result *adapter.HTTPResponseScriptResult
- result, err = responseScript.ExecuteHTTPResponse(ctx, time.Duration(responseScriptOptions.Timeout), request, response, responseBody, responseScriptOptions.BinaryBodyMode, responseScriptOptions.Arguments)
- if err != nil {
- return E.Cause(err, "execute script/", responseScript.Type(), "[", responseScript.Tag(), "]")
- }
- if result.Status > 0 {
- response.Status = http.StatusText(result.Status)
- response.StatusCode = result.Status
- }
- for key, values := range result.Headers {
- response.Header[key] = values
- }
- if result.Body != nil {
- response.Body.Close()
- response.Body = io.NopCloser(bytes.NewReader(result.Body))
- response.ContentLength = int64(len(result.Body))
- }
- }
- if !responseMatch {
- for i, rule := range options.SurgeHeaderRewrite {
- if !rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- responseMatch = true
- e.logger.DebugContext(ctx, "match header_rewrite[", i, "] => ", rule.String())
- switch {
- case rule.Add:
- response.Header.Add(rule.Key, rule.Value)
- case rule.Delete:
- response.Header.Del(rule.Key)
- case rule.Replace:
- if response.Header.Get(rule.Key) != "" {
- response.Header.Set(rule.Key, rule.Value)
- }
- case rule.ReplaceRegex:
- if value := response.Header.Get(rule.Key); value != "" {
- response.Header.Set(rule.Key, rule.Match.ReplaceAllString(value, rule.Value))
- }
- }
- }
- for i, rule := range options.SurgeBodyRewrite {
- if !rule.Response {
- continue
- }
- if !rule.Pattern.MatchString(requestURL) {
- continue
- }
- responseMatch = true
- e.logger.DebugContext(ctx, "match body_rewrite[", i, "] => ", rule.String())
- if responseBody == nil {
- if response.ContentLength <= 0 {
- e.logger.WarnContext(ctx, "body replace skipped due to non-fixed content length")
- break
- } else if response.ContentLength > 131072 {
- e.logger.WarnContext(ctx, "body replace skipped due to large content length: ", request.ContentLength)
- break
- }
- responseBody, err = io.ReadAll(response.Body)
- if err != nil {
- return E.Cause(err, "read HTTP request body")
- }
- response.Body.Close()
- }
- for mi := 0; i < len(rule.Match); i++ {
- responseBody = rule.Match[mi].ReplaceAll(responseBody, []byte(rule.Replace[i]))
- }
- response.Body = io.NopCloser(bytes.NewReader(responseBody))
- response.ContentLength = int64(len(responseBody))
- }
- }
- if !options.Print && !requestMatch && !responseMatch {
- e.logger.WarnContext(ctx, "request not modified")
- }
- for key, values := range response.Header {
- writer.Header()[key] = values
- }
- writer.WriteHeader(response.StatusCode)
- _, err = io.Copy(writer, response.Body)
- response.Body.Close()
- if err != nil {
- return E.Cause(err, "write HTTP response")
- }
- return nil
- }
- func (e *Engine) printRequest(ctx context.Context, request *http.Request, body []byte) {
- var builder strings.Builder
- builder.WriteString(F.ToString(request.Proto, " ", request.Method, " ", request.URL))
- builder.WriteString("\n")
- if request.URL.Hostname() != "" && request.URL.Hostname() != request.Host {
- builder.WriteString("Host: ")
- builder.WriteString(request.Host)
- builder.WriteString("\n")
- }
- for key, values := range request.Header {
- for _, value := range values {
- builder.WriteString(key)
- builder.WriteString(": ")
- builder.WriteString(value)
- builder.WriteString("\n")
- }
- }
- if len(body) > 0 {
- builder.WriteString("\n")
- if !bytes.ContainsFunc(body, func(r rune) bool {
- return !unicode.IsPrint(r) && !unicode.IsSpace(r)
- }) {
- builder.Write(body)
- } else {
- builder.WriteString("(body not printable)")
- }
- }
- e.logger.InfoContext(ctx, "request: ", builder.String())
- }
- func (e *Engine) printResponse(ctx context.Context, request *http.Request, response *http.Response, body []byte) {
- var builder strings.Builder
- builder.WriteString(F.ToString(response.Proto, " ", response.Status, " ", request.URL))
- builder.WriteString("\n")
- for key, values := range response.Header {
- for _, value := range values {
- builder.WriteString(key)
- builder.WriteString(": ")
- builder.WriteString(value)
- builder.WriteString("\n")
- }
- }
- if len(body) > 0 {
- builder.WriteString("\n")
- if !bytes.ContainsFunc(body, func(r rune) bool {
- return !unicode.IsPrint(r) && !unicode.IsSpace(r)
- }) {
- builder.Write(body)
- } else {
- builder.WriteString("(body not printable)")
- }
- }
- e.logger.InfoContext(ctx, "response: ", builder.String())
- }
- type simpleResponseWriter struct {
- statusCode int
- header http.Header
- body bytes.Buffer
- }
- func (w *simpleResponseWriter) Build(request *http.Request) *http.Response {
- return &http.Response{
- StatusCode: w.statusCode,
- Status: http.StatusText(w.statusCode),
- Proto: request.Proto,
- ProtoMajor: request.ProtoMajor,
- ProtoMinor: request.ProtoMinor,
- Header: w.header,
- Body: io.NopCloser(&w.body),
- }
- }
- func (w *simpleResponseWriter) Header() http.Header {
- if w.header == nil {
- w.header = make(http.Header)
- }
- return w.header
- }
- func (w *simpleResponseWriter) Write(b []byte) (int, error) {
- return w.body.Write(b)
- }
- func (w *simpleResponseWriter) WriteHeader(statusCode int) {
- w.statusCode = statusCode
- }
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