fix: conn reader stuck when header have body

main.go

@@ -1,14 +1,20 @@
 package main
 
 import (
-	"golang.org/x/crypto/ssh"
 	"log"
+	"net/http"
+	_ "net/http/pprof"
 	"os"
 	"tunnel_pls/server"
 	"tunnel_pls/utils"
+
+	"golang.org/x/crypto/ssh"
 )
 
 func main() {
+	go func() {
+		log.Println(http.ListenAndServe("localhost:6060", nil))
+	}()
 	sshConfig := &ssh.ServerConfig{
 		NoClientAuth:  true,
 		ServerVersion: "SSH-2.0-TunnlPls-1.0",

server/http.go

@@ -10,7 +10,6 @@ import (
 	"net"
 	"regexp"
 	"strings"
-	"time"
 	"tunnel_pls/session"
 	"tunnel_pls/utils"
 
@@ -28,27 +27,66 @@ type CustomWriter struct {
 	reader      io.Reader
 	headerBuf   []byte
 	buf         []byte
+	respHeader  *ResponseHeaderFactory
+	reqHeader   *RequestHeaderFactory
 	interaction *session.Interaction
+	respMW      []ResponseMiddleware
+	reqStartMW  []RequestMiddleware
+	reqEndMW    []RequestMiddleware
 }
 
 func (cw *CustomWriter) Read(p []byte) (int, error) {
-	if cw == nil {
+	tmp := make([]byte, len(p))
-		return 0, errors.New("can not read from nil CustomWriter")
+	read, err := cw.reader.Read(tmp)
-	}
-	read, err := cw.reader.Read(p)
 	if err != nil {
 		return 0, err
 	}
-	reader := bytes.NewReader(p)
+
-	reqhf, err := NewRequestHeaderFactory(reader)
+	tmp = tmp[:read]
-	if err != nil {
+
-		if errors.Is(err, io.EOF) {
+	idx := bytes.Index(tmp, DELIMITER)
-			return read, io.EOF
+	if idx == -1 {
+		copy(p, tmp)
+		return read, nil
+	}
+
+	header := tmp[:idx+len(DELIMITER)]
+	body := tmp[idx+len(DELIMITER):]
+
+	if !isHTTPHeader(header) {
+		copy(p, tmp)
+		return read, nil
+	}
+
+	for _, m := range cw.reqEndMW {
+		err := m.HandleRequest(cw.reqHeader)
+		if err != nil {
+			log.Printf("Error when applying request middleware: %v", err)
+			return 0, err
 		}
+	}
+
+	headerReader := bufio.NewReader(bytes.NewReader(header))
+	reqhf, err := NewRequestHeaderFactory(headerReader)
+	if err != nil {
 		return 0, err
 	}
-	cw.interaction.SendMessage(fmt.Sprintf("\033[32m%s %s -> %s %s \033[0m\r\n", time.Now().UTC().Format(time.RFC3339), cw.RemoteAddr.String(), reqhf.Method, reqhf.Path))
+
-	return read, err
+	for _, m := range cw.reqStartMW {
+		err := m.HandleRequest(reqhf)
+		if err != nil {
+			log.Printf("Error when applying request middleware: %v", err)
+			return 0, err
+		}
+	}
+
+	cw.reqHeader = reqhf
+	finalHeader := reqhf.Finalize()
+
+	n := copy(p, finalHeader)
+	n += copy(p[n:], body)
+
+	return n, nil
 }
 
 func NewCustomWriter(writer io.Writer, reader io.Reader, remoteAddr net.Addr) *CustomWriter {
@@ -99,9 +137,15 @@ func (cw *CustomWriter) Write(p []byte) (int, error) {
 
 		if isHTTPHeader(header) {
 			resphf := NewResponseHeaderFactory(header)
-			resphf.Set("Server", "Tunnel Please")
+			for _, m := range cw.respMW {
-
+				err := m.HandleResponse(resphf, body)
+				if err != nil {
+					log.Printf("Cannot apply middleware: %s\n", err)
+					return 0, err
+				}
+			}
 			header = resphf.Finalize()
+			cw.respHeader = resphf
 			_, err := cw.writer.Write(header)
 			if err != nil {
 				return 0, err
@@ -117,12 +161,19 @@ func (cw *CustomWriter) Write(p []byte) (int, error) {
 			return len(p), nil
 		}
 	}
+
 	cw.buf = nil
 	n, err := cw.writer.Write(p)
 	if err != nil {
 		return n, err
 	}
-
+	for _, m := range cw.respMW {
+		err := m.HandleResponse(cw.respHeader, p)
+		if err != nil {
+			log.Printf("Cannot apply middleware: %s\n", err)
+			return 0, err
+		}
+	}
 	return n, nil
 }
 
@@ -272,14 +323,28 @@ func forwardRequest(cw *CustomWriter, initialRequest *RequestHeaderFactory, sshS
 			}
 		}
 	}()
-
 	_, err = channel.Write(initialRequest.Finalize())
 	if err != nil {
 		log.Printf("Failed to forward request: %v", err)
 		return
 	}
+	//TODO: Implement wrapper func buat add/remove middleware
+	fingerprintMiddleware := NewTunnelFingerprint()
+	loggerMiddleware := NewRequestLogger(cw.interaction, cw.RemoteAddr)
+	cw.respMW = append(cw.respMW, fingerprintMiddleware)
+	cw.reqStartMW = append(cw.reqStartMW, loggerMiddleware)
 
-	cw.interaction.SendMessage(fmt.Sprintf("\033[32m%s %s -> %s %s \033[0m\r\n", time.Now().UTC().Format(time.RFC3339), cw.RemoteAddr.String(), initialRequest.Method, initialRequest.Path))
+	//TODO: Tambah req Middleware
+	cw.reqEndMW = nil
+	cw.reqHeader = initialRequest
+
+	for _, m := range cw.reqStartMW {
+		err := m.HandleRequest(cw.reqHeader)
+		if err != nil {
+			log.Printf("Error handling request: %v", err)
+			return
+		}
+	}
 
 	sshSession.HandleForwardedConnection(cw, channel, cw.RemoteAddr)
 	return

server/middleware.go

@@ -0,0 +1,162 @@
+package server
+
+import (
+	"fmt"
+	"net"
+	"time"
+	"tunnel_pls/session"
+)
+
+type RequestMiddleware interface {
+	HandleRequest(header *RequestHeaderFactory) error
+}
+
+type ResponseMiddleware interface {
+	HandleResponse(header *ResponseHeaderFactory, body []byte) error
+}
+
+type TunnelFingerprint struct{}
+
+func NewTunnelFingerprint() *TunnelFingerprint {
+	return &TunnelFingerprint{}
+}
+func (h *TunnelFingerprint) HandleRequest(header *RequestHeaderFactory) error {
+	return nil
+}
+func (h *TunnelFingerprint) HandleResponse(header *ResponseHeaderFactory, body []byte) error {
+	header.Set("Server", "Tunnel Please")
+	return nil
+}
+
+type RequestLogger struct {
+	interaction session.Interaction
+	remoteAddr  net.Addr
+}
+
+func NewRequestLogger(interaction *session.Interaction, remoteAddr net.Addr) *RequestLogger {
+	return &RequestLogger{
+		interaction: *interaction,
+		remoteAddr:  remoteAddr,
+	}
+}
+func (rl *RequestLogger) HandleRequest(header *RequestHeaderFactory) error {
+	rl.interaction.SendMessage(fmt.Sprintf("\033[32m%s %s -> %s %s \033[0m\r\n", time.Now().UTC().Format(time.RFC3339), rl.remoteAddr.String(), header.Method, header.Path))
+	return nil
+}
+func (rl *RequestLogger) HandleResponse(header *ResponseHeaderFactory, body []byte) error { return nil }
+
+//TODO: Implement caching atau enggak
+//const maxCacheSize = 50 * 1024 * 1024
+//
+//type DiskCacheMiddleware struct {
+//	dir       string
+//	mu        sync.Mutex
+//	file      *os.File
+//	path      string
+//	cacheable bool
+//}
+//
+//func NewDiskCacheMiddleware() *DiskCacheMiddleware {
+//	return &DiskCacheMiddleware{dir: "cache"}
+//}
+//
+//func (c *DiskCacheMiddleware) ensureDir() error {
+//	return os.MkdirAll(c.dir, 0755)
+//}
+//
+//func (c *DiskCacheMiddleware) cacheKey(method, path string) string {
+//	return fmt.Sprintf("%s_%s.cache", method, base64.URLEncoding.EncodeToString([]byte(path)))
+//}
+//
+//func (c *DiskCacheMiddleware) filePath(method, path string) string {
+//	return filepath.Join(c.dir, c.cacheKey(method, path))
+//}
+//
+//func fileExists(path string) bool {
+//	_, err := os.Stat(path)
+//	if err == nil {
+//		return true
+//	}
+//	if os.IsNotExist(err) {
+//		return false
+//	}
+//	return false
+//}
+//
+//func canCacheRequest(header *RequestHeaderFactory) bool {
+//	if header.Method != "GET" {
+//		return false
+//	}
+//
+//	if cacheControl := header.Get("Cache-Control"); cacheControl != "" {
+//		if strings.Contains(cacheControl, "no-store") || strings.Contains(cacheControl, "private") || strings.Contains(cacheControl, "no-cache") || strings.Contains(cacheControl, "max-age=0") {
+//			return false
+//		}
+//	}
+//
+//	if header.Get("Authorization") != "" {
+//		return false
+//	}
+//
+//	if header.Get("Cookie") != "" {
+//		return false
+//	}
+//
+//	return true
+//}
+//
+//func (c *DiskCacheMiddleware) HandleRequest(header *RequestHeaderFactory) error {
+//	if !canCacheRequest(header) {
+//		c.cacheable = false
+//		return nil
+//	}
+//
+//	c.cacheable = true
+//	_ = c.ensureDir()
+//	path := c.filePath(header.Method, header.Path)
+//
+//	if fileExists(path + ".finish") {
+//		c.file = nil
+//		return nil
+//	}
+//
+//	if c.file != nil {
+//		err := c.file.Close()
+//		if err != nil {
+//			return err
+//		}
+//		err = os.Rename(c.path, c.path+".finish")
+//		if err != nil {
+//			return err
+//		}
+//	}
+//
+//	c.path = path
+//	f, err := os.OpenFile(path, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+//	if err != nil {
+//		return err
+//	}
+//
+//	c.file = f
+//
+//	return nil
+//}
+//
+//func (c *DiskCacheMiddleware) HandleResponse(header *ResponseHeaderFactory, body []byte) error {
+//	if !c.cacheable {
+//		return nil
+//	}
+//
+//	if c.file == nil {
+//		header.Set("X-Cache", "HIT")
+//		return nil
+//	}
+//
+//	_, err := c.file.Write(body)
+//	if err != nil {
+//		return err
+//	}
+//
+//	header.Set("X-Cache", "MISS")
+//	return nil
+//}

session/forwarder.go

@@ -0,0 +1,37 @@
+package session
+
+import (
+	"net"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type Forwarder struct {
+	Listener      net.Listener
+	TunnelType    TunnelType
+	ForwardedPort uint16
+
+	getSlug func() string
+	setSlug func(string)
+}
+
+type ForwardingController interface {
+	HandleGlobalRequest(ch <-chan *ssh.Request)
+	HandleTCPIPForward(req *ssh.Request)
+	HandleHTTPForward(req *ssh.Request, port uint16)
+	HandleTCPForward(req *ssh.Request, addr string, port uint16)
+	AcceptTCPConnections()
+}
+
+type ForwarderInfo interface {
+	GetTunnelType() TunnelType
+	GetForwardedPort() uint16
+}
+
+func (f *Forwarder) GetTunnelType() TunnelType {
+	return f.TunnelType
+}
+
+func (f *Forwarder) GetForwardedPort() uint16 {
+	return f.ForwardedPort
+}

session/interaction.go

@@ -12,6 +12,32 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
+type InteractionController interface {
+	SendMessage(message string)
+	HandleUserInput()
+	HandleCommand(conn ssh.Channel, command string, inSlugEditMode *bool, editSlug *string, buf *bytes.Buffer)
+	HandleSlugEditMode(conn ssh.Channel, inSlugEditMode *bool, editSlug *string, char byte, buf *bytes.Buffer)
+	HandleSlugSave(conn ssh.Channel, inSlugEditMode *bool, editSlug *string, buf *bytes.Buffer)
+	HandleSlugCancel(conn ssh.Channel, inSlugEditMode *bool, buf *bytes.Buffer)
+	HandleSlugUpdateError()
+	ShowWelcomeMessage()
+	DisplaySlugEditor()
+}
+
+type Interaction struct {
+	CommandBuffer *bytes.Buffer
+	EditMode      bool
+	EditSlug      string
+	channel       ssh.Channel
+
+	getSlug func() string
+	setSlug func(string)
+
+	session SessionCloser
+
+	forwarder ForwarderInfo
+}
+
 func (i *Interaction) SendMessage(message string) {
 	if i.channel != nil {
 		_, err := i.channel.Write([]byte(message))

session/session.go

@@ -3,7 +3,6 @@ package session
 import (
 	"bytes"
 	"log"
-	"net"
 	"sync"
 
 	"golang.org/x/crypto/ssh"
@@ -31,26 +30,6 @@ type SessionCloser interface {
 	Close() error
 }
 
-type InteractionController interface {
-	SendMessage(message string)
-	HandleUserInput()
-	HandleCommand(conn ssh.Channel, command string, inSlugEditMode *bool, editSlug *string, buf *bytes.Buffer)
-	HandleSlugEditMode(conn ssh.Channel, inSlugEditMode *bool, editSlug *string, char byte, buf *bytes.Buffer)
-	HandleSlugSave(conn ssh.Channel, inSlugEditMode *bool, editSlug *string, buf *bytes.Buffer)
-	HandleSlugCancel(conn ssh.Channel, inSlugEditMode *bool, buf *bytes.Buffer)
-	HandleSlugUpdateError()
-	ShowWelcomeMessage()
-	DisplaySlugEditor()
-}
-
-type ForwardingController interface {
-	HandleGlobalRequest(ch <-chan *ssh.Request)
-	HandleTCPIPForward(req *ssh.Request)
-	HandleHTTPForward(req *ssh.Request, port uint16)
-	HandleTCPForward(req *ssh.Request, addr string, port uint16)
-	AcceptTCPConnections()
-}
-
 type Session interface {
 	SessionLifecycle
 	InteractionController
@@ -61,41 +40,6 @@ type Lifecycle struct {
 	Status Status
 }
 
-type Forwarder struct {
-	Listener      net.Listener
-	TunnelType    TunnelType
-	ForwardedPort uint16
-
-	getSlug func() string
-	setSlug func(string)
-}
-
-type ForwarderInfo interface {
-	GetTunnelType() TunnelType
-	GetForwardedPort() uint16
-}
-
-func (f *Forwarder) GetTunnelType() TunnelType {
-	return f.TunnelType
-}
-
-func (f *Forwarder) GetForwardedPort() uint16 {
-	return f.ForwardedPort
-}
-
-type Interaction struct {
-	CommandBuffer *bytes.Buffer
-	EditMode      bool
-	EditSlug      string
-	channel       ssh.Channel
-
-	getSlug func() string
-	setSlug func(string)
-
-	session SessionCloser
-
-	forwarder ForwarderInfo
-}
 type SSHSession struct {
 	Lifecycle   *Lifecycle
 	Interaction *Interaction