.gitea/workflows/sonarqube.yml

@@ -0,0 +1,20 @@
+on:
+  push:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+name: SonarQube Scan
+jobs:
+  sonarqube:
+    name: SonarQube Trigger
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checking out
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: SonarQube Scan
+        uses: SonarSource/sonarqube-scan-action@v7.0.0
+        env:
+          SONAR_HOST_URL: ${{ secrets.SONARQUBE_HOST }}
+          SONAR_TOKEN: ${{ secrets.SONARQUBE_TOKEN }}

internal/config/config.go

@@ -1,33 +1,63 @@
 package config
 
-import (
-	"os"
-	"strconv"
+import "tunnel_pls/types"
 
-	"github.com/joho/godotenv"
-)
+type Config interface {
+	Domain() string
+	SSHPort() string
 
-func Load() error {
-	if _, err := os.Stat(".env"); err == nil {
-		return godotenv.Load(".env")
-	}
-	return nil
+	HTTPPort() string
+	HTTPSPort() string
+
+	TLSEnabled() bool
+	TLSRedirect() bool
+
+	ACMEEmail() string
+	CFAPIToken() string
+	ACMEStaging() bool
+
+	AllowedPortsStart() uint16
+	AllowedPortsEnd() uint16
+
+	BufferSize() int
+
+	PprofEnabled() bool
+	PprofPort() string
+
+	Mode() types.ServerMode
+	GRPCAddress() string
+	GRPCPort() string
+	NodeToken() string
 }
 
-func Getenv(key, defaultValue string) string {
-	val := os.Getenv(key)
-	if val == "" {
-		val = defaultValue
+func MustLoad() (Config, error) {
+	if err := loadEnvFile(); err != nil {
+		return nil, err
 	}
 
-	return val
+	cfg, err := parse()
+	if err != nil {
+		return nil, err
+	}
+
+	return cfg, nil
 }
 
-func GetBufferSize() int {
-	sizeStr := Getenv("BUFFER_SIZE", "32768")
-	size, err := strconv.Atoi(sizeStr)
-	if err != nil || size < 4096 || size > 1048576 {
-		return 32768
-	}
-	return size
-}
+func (c *config) Domain() string            { return c.domain }
+func (c *config) SSHPort() string           { return c.sshPort }
+func (c *config) HTTPPort() string          { return c.httpPort }
+func (c *config) HTTPSPort() string         { return c.httpsPort }
+func (c *config) TLSEnabled() bool          { return c.tlsEnabled }
+func (c *config) TLSRedirect() bool         { return c.tlsRedirect }
+func (c *config) ACMEEmail() string         { return c.acmeEmail }
+func (c *config) CFAPIToken() string        { return c.cfAPIToken }
+func (c *config) ACMEStaging() bool         { return c.acmeStaging }
+func (c *config) AllowedPortsStart() uint16 { return c.allowedPortsStart }
+func (c *config) AllowedPortsEnd() uint16   { return c.allowedPortsEnd }
+func (c *config) BufferSize() int           { return c.bufferSize }
+func (c *config) PprofEnabled() bool        { return c.pprofEnabled }
+func (c *config) PprofPort() string         { return c.pprofPort }
+func (c *config) Mode() types.ServerMode    { return c.mode }
+func (c *config) GRPCAddress() string       { return c.grpcAddress }
+func (c *config) GRPCPort() string          { return c.grpcPort }
+func (c *config) NodeToken() string         { return c.nodeToken }

internal/config/loader.go

@@ -0,0 +1,170 @@
+package config
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"tunnel_pls/types"
+
+	"github.com/joho/godotenv"
+)
+
+type config struct {
+	domain  string
+	sshPort string
+
+	httpPort  string
+	httpsPort string
+
+	tlsEnabled  bool
+	tlsRedirect bool
+
+	acmeEmail   string
+	cfAPIToken  string
+	acmeStaging bool
+
+	allowedPortsStart uint16
+	allowedPortsEnd   uint16
+
+	bufferSize int
+
+	pprofEnabled bool
+	pprofPort    string
+
+	mode        types.ServerMode
+	grpcAddress string
+	grpcPort    string
+	nodeToken   string
+}
+
+func parse() (*config, error) {
+	mode, err := parseMode()
+	if err != nil {
+		return nil, err
+	}
+
+	domain := getenv("DOMAIN", "localhost")
+	sshPort := getenv("PORT", "2200")
+
+	httpPort := getenv("HTTP_PORT", "8080")
+	httpsPort := getenv("HTTPS_PORT", "8443")
+
+	tlsEnabled := getenvBool("TLS_ENABLED", false)
+	tlsRedirect := tlsEnabled && getenvBool("TLS_REDIRECT", false)
+
+	acmeEmail := getenv("ACME_EMAIL", "admin@"+domain)
+	acmeStaging := getenvBool("ACME_STAGING", false)
+
+	cfToken := getenv("CF_API_TOKEN", "")
+	if tlsEnabled && cfToken == "" {
+		return nil, fmt.Errorf("CF_API_TOKEN is required when TLS is enabled")
+	}
+
+	start, end, err := parseAllowedPorts()
+	if err != nil {
+		return nil, err
+	}
+
+	bufferSize := parseBufferSize()
+
+	pprofEnabled := getenvBool("PPROF_ENABLED", false)
+	pprofPort := getenv("PPROF_PORT", "6060")
+
+	grpcHost := getenv("GRPC_ADDRESS", "localhost")
+	grpcPort := getenv("GRPC_PORT", "8080")
+
+	nodeToken := getenv("NODE_TOKEN", "")
+	if mode == types.ServerModeNODE && nodeToken == "" {
+		return nil, fmt.Errorf("NODE_TOKEN is required in node mode")
+	}
+
+	return &config{
+		domain:            domain,
+		sshPort:           sshPort,
+		httpPort:          httpPort,
+		httpsPort:         httpsPort,
+		tlsEnabled:        tlsEnabled,
+		tlsRedirect:       tlsRedirect,
+		acmeEmail:         acmeEmail,
+		cfAPIToken:        cfToken,
+		acmeStaging:       acmeStaging,
+		allowedPortsStart: start,
+		allowedPortsEnd:   end,
+		bufferSize:        bufferSize,
+		pprofEnabled:      pprofEnabled,
+		pprofPort:         pprofPort,
+		mode:              mode,
+		grpcAddress:       grpcHost,
+		grpcPort:          grpcPort,
+		nodeToken:         nodeToken,
+	}, nil
+}
+
+func loadEnvFile() error {
+	if _, err := os.Stat(".env"); err == nil {
+		return godotenv.Load(".env")
+	}
+	return nil
+}
+
+func parseMode() (types.ServerMode, error) {
+	switch strings.ToLower(getenv("MODE", "standalone")) {
+	case "standalone":
+		return types.ServerModeSTANDALONE, nil
+	case "node":
+		return types.ServerModeNODE, nil
+	default:
+		return 0, fmt.Errorf("invalid MODE value")
+	}
+}
+
+func parseAllowedPorts() (uint16, uint16, error) {
+	raw := getenv("ALLOWED_PORTS", "")
+	if raw == "" {
+		return 0, 0, nil
+	}
+
+	parts := strings.Split(raw, "-")
+	if len(parts) != 2 {
+		return 0, 0, fmt.Errorf("invalid ALLOWED_PORTS format")
+	}
+
+	start, err := strconv.ParseUint(parts[0], 10, 16)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	end, err := strconv.ParseUint(parts[1], 10, 16)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	return uint16(start), uint16(end), nil
+}
+
+func parseBufferSize() int {
+	raw := getenv("BUFFER_SIZE", "32768")
+	size, err := strconv.Atoi(raw)
+	if err != nil || size < 4096 || size > 1048576 {
+		log.Println("Invalid BUFFER_SIZE, falling back to 4096")
+		return 4096
+	}
+	return size
+}
+
+func getenv(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func getenvBool(key string, def bool) bool {
+	val := os.Getenv(key)
+	if val == "" {
+		return def
+	}
+	return val == "true"
+}

internal/grpc/client/client.go

@@ -8,10 +8,9 @@ import (
 	"log"
 	"time"
 	"tunnel_pls/internal/config"
+	"tunnel_pls/internal/registry"
 	"tunnel_pls/types"
 
-	"tunnel_pls/session"
-
 	proto "git.fossy.my.id/bagas/tunnel-please-grpc/gen"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
@@ -30,15 +29,16 @@ type Client interface {
 	CheckServerHealth(ctx context.Context) error
 }
 type client struct {
+	config                     config.Config
 	conn                       *grpc.ClientConn
 	address                    string
-	sessionRegistry            session.Registry
+	sessionRegistry            registry.Registry
 	eventService               proto.EventServiceClient
 	authorizeConnectionService proto.UserServiceClient
 	closing                    bool
 }
 
-func New(address string, sessionRegistry session.Registry) (Client, error) {
+func New(config config.Config, address string, sessionRegistry registry.Registry) (Client, error) {
 	var opts []grpc.DialOption
 
 	opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
@@ -67,6 +67,7 @@ func New(address string, sessionRegistry session.Registry) (Client, error) {
 	authorizeConnectionService := proto.NewUserServiceClient(conn)
 
 	return &client{
+		config:                     config,
 		conn:                       conn,
 		address:                    address,
 		sessionRegistry:            sessionRegistry,
@@ -193,7 +194,7 @@ func (c *client) handleSlugChange(subscribe grpc.BidiStreamingClient[proto.Node,
 	oldSlug := slugEvent.GetOld()
 	newSlug := slugEvent.GetNew()
 
-	userSession, err := c.sessionRegistry.Get(types.SessionKey{Id: oldSlug, Type: types.HTTP})
+	userSession, err := c.sessionRegistry.Get(types.SessionKey{Id: oldSlug, Type: types.TunnelTypeHTTP})
 	if err != nil {
 		return c.sendNode(subscribe, &proto.Node{
 			Type: proto.EventType_SLUG_CHANGE_RESPONSE,
@@ -203,7 +204,7 @@ func (c *client) handleSlugChange(subscribe grpc.BidiStreamingClient[proto.Node,
 		}, "slug change failure response")
 	}
 
-	if err = c.sessionRegistry.Update(user, types.SessionKey{Id: oldSlug, Type: types.HTTP}, types.SessionKey{Id: newSlug, Type: types.HTTP}); err != nil {
+	if err = c.sessionRegistry.Update(user, types.SessionKey{Id: oldSlug, Type: types.TunnelTypeHTTP}, types.SessionKey{Id: newSlug, Type: types.TunnelTypeHTTP}); err != nil {
 		return c.sendNode(subscribe, &proto.Node{
 			Type: proto.EventType_SLUG_CHANGE_RESPONSE,
 			Payload: &proto.Node_SlugEventResponse{
@@ -228,7 +229,7 @@ func (c *client) handleGetSessions(subscribe grpc.BidiStreamingClient[proto.Node
 	for _, ses := range sessions {
 		detail := ses.Detail()
 		details = append(details, &proto.Detail{
-			Node:           config.Getenv("DOMAIN", "localhost"),
+			Node:           c.config.Domain(),
 			ForwardingType: detail.ForwardingType,
 			Slug:           detail.Slug,
 			UserId:         detail.UserID,
@@ -300,11 +301,11 @@ func (c *client) sendNode(subscribe grpc.BidiStreamingClient[proto.Node, proto.E
 func (c *client) protoToTunnelType(t proto.TunnelType) (types.TunnelType, error) {
 	switch t {
 	case proto.TunnelType_HTTP:
-		return types.HTTP, nil
+		return types.TunnelTypeHTTP, nil
 	case proto.TunnelType_TCP:
-		return types.TCP, nil
+		return types.TunnelTypeTCP, nil
 	default:
-		return types.UNKNOWN, fmt.Errorf("unknown tunnel type received")
+		return types.TunnelTypeUNKNOWN, fmt.Errorf("unknown tunnel type received")
 	}
 }
 

internal/http/header/header.go

@@ -0,0 +1,30 @@
+package header
+
+type ResponseHeader interface {
+	Value(key string) string
+	Set(key string, value string)
+	Remove(key string)
+	Finalize() []byte
+}
+
+type responseHeader struct {
+	startLine []byte
+	headers   map[string]string
+}
+
+type RequestHeader interface {
+	Value(key string) string
+	Set(key string, value string)
+	Remove(key string)
+	Finalize() []byte
+	Method() string
+	Path() string
+	Version() string
+}
+type requestHeader struct {
+	method    string
+	path      string
+	version   string
+	startLine []byte
+	headers   map[string]string
+}

internal/http/header/parser.go

@@ -0,0 +1,148 @@
+package header
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+)
+
+func setRemainingHeaders(remaining []byte, header interface {
+	Set(key string, value string)
+}) {
+	for len(remaining) > 0 {
+		lineEnd := bytes.Index(remaining, []byte("\r\n"))
+		if lineEnd == -1 {
+			lineEnd = len(remaining)
+		}
+
+		line := remaining[:lineEnd]
+
+		if len(line) == 0 {
+			break
+		}
+
+		colonIdx := bytes.IndexByte(line, ':')
+		if colonIdx != -1 {
+			key := bytes.TrimSpace(line[:colonIdx])
+			value := bytes.TrimSpace(line[colonIdx+1:])
+			header.Set(string(key), string(value))
+		}
+
+		if lineEnd == len(remaining) {
+			break
+		}
+
+		remaining = remaining[lineEnd+2:]
+	}
+}
+
+func parseHeadersFromBytes(headerData []byte) (RequestHeader, error) {
+	header := &requestHeader{
+		headers: make(map[string]string, 16),
+	}
+
+	lineEnd := bytes.Index(headerData, []byte("\r\n"))
+	if lineEnd == -1 {
+		return nil, fmt.Errorf("invalid request: no CRLF found in start line")
+	}
+
+	startLine := headerData[:lineEnd]
+	header.startLine = startLine
+	var err error
+	header.method, header.path, header.version, err = parseStartLine(startLine)
+	if err != nil {
+		return nil, err
+	}
+
+	remaining := headerData[lineEnd+2:]
+
+	setRemainingHeaders(remaining, header)
+
+	return header, nil
+}
+
+func parseStartLine(startLine []byte) (method, path, version string, err error) {
+	firstSpace := bytes.IndexByte(startLine, ' ')
+	if firstSpace == -1 {
+		return "", "", "", fmt.Errorf("invalid start line: missing method")
+	}
+
+	secondSpace := bytes.IndexByte(startLine[firstSpace+1:], ' ')
+	if secondSpace == -1 {
+		return "", "", "", fmt.Errorf("invalid start line: missing version")
+	}
+	secondSpace += firstSpace + 1
+
+	method = string(startLine[:firstSpace])
+	path = string(startLine[firstSpace+1 : secondSpace])
+	version = string(startLine[secondSpace+1:])
+
+	return method, path, version, nil
+}
+
+func parseHeadersFromReader(br *bufio.Reader) (RequestHeader, error) {
+	header := &requestHeader{
+		headers: make(map[string]string, 16),
+	}
+
+	startLineBytes, err := br.ReadSlice('\n')
+	if err != nil {
+		return nil, err
+	}
+
+	startLineBytes = bytes.TrimRight(startLineBytes, "\r\n")
+	header.startLine = make([]byte, len(startLineBytes))
+	copy(header.startLine, startLineBytes)
+
+	header.method, header.path, header.version, err = parseStartLine(header.startLine)
+	if err != nil {
+		return nil, err
+	}
+
+	for {
+		lineBytes, err := br.ReadSlice('\n')
+		if err != nil {
+			return nil, err
+		}
+
+		lineBytes = bytes.TrimRight(lineBytes, "\r\n")
+
+		if len(lineBytes) == 0 {
+			break
+		}
+
+		colonIdx := bytes.IndexByte(lineBytes, ':')
+		if colonIdx == -1 {
+			continue
+		}
+
+		key := bytes.TrimSpace(lineBytes[:colonIdx])
+		value := bytes.TrimSpace(lineBytes[colonIdx+1:])
+
+		header.headers[string(key)] = string(value)
+	}
+
+	return header, nil
+}
+
+func finalize(startLine []byte, headers map[string]string) []byte {
+	size := len(startLine) + 2
+	for key, val := range headers {
+		size += len(key) + 2 + len(val) + 2
+	}
+	size += 2
+
+	buf := make([]byte, 0, size)
+	buf = append(buf, startLine...)
+	buf = append(buf, '\r', '\n')
+
+	for key, val := range headers {
+		buf = append(buf, key...)
+		buf = append(buf, ':', ' ')
+		buf = append(buf, val...)
+		buf = append(buf, '\r', '\n')
+	}
+
+	buf = append(buf, '\r', '\n')
+	return buf
+}

internal/http/header/request.go

@@ -0,0 +1,49 @@
+package header
+
+import (
+	"bufio"
+	"fmt"
+)
+
+func NewRequest(r interface{}) (RequestHeader, error) {
+	switch v := r.(type) {
+	case []byte:
+		return parseHeadersFromBytes(v)
+	case *bufio.Reader:
+		return parseHeadersFromReader(v)
+	default:
+		return nil, fmt.Errorf("unsupported type: %T", r)
+	}
+}
+
+func (req *requestHeader) Value(key string) string {
+	val, ok := req.headers[key]
+	if !ok {
+		return ""
+	}
+	return val
+}
+
+func (req *requestHeader) Set(key string, value string) {
+	req.headers[key] = value
+}
+
+func (req *requestHeader) Remove(key string) {
+	delete(req.headers, key)
+}
+
+func (req *requestHeader) Method() string {
+	return req.method
+}
+
+func (req *requestHeader) Path() string {
+	return req.path
+}
+
+func (req *requestHeader) Version() string {
+	return req.version
+}
+
+func (req *requestHeader) Finalize() []byte {
+	return finalize(req.startLine, req.headers)
+}

internal/http/header/response.go

@@ -0,0 +1,40 @@
+package header
+
+import (
+	"bytes"
+	"fmt"
+)
+
+func NewResponse(headerData []byte) (ResponseHeader, error) {
+	header := &responseHeader{
+		startLine: nil,
+		headers:   make(map[string]string, 16),
+	}
+
+	lineEnd := bytes.Index(headerData, []byte("\r\n"))
+	if lineEnd == -1 {
+		return nil, fmt.Errorf("invalid response: no CRLF found in start line")
+	}
+
+	header.startLine = headerData[:lineEnd]
+	remaining := headerData[lineEnd+2:]
+	setRemainingHeaders(remaining, header)
+
+	return header, nil
+}
+
+func (resp *responseHeader) Value(key string) string {
+	return resp.headers[key]
+}
+
+func (resp *responseHeader) Set(key string, value string) {
+	resp.headers[key] = value
+}
+
+func (resp *responseHeader) Remove(key string) {
+	delete(resp.headers, key)
+}
+
+func (resp *responseHeader) Finalize() []byte {
+	return finalize(resp.startLine, resp.headers)
+}

internal/http/stream/parser.go

@@ -0,0 +1,29 @@
+package stream
+
+import "bytes"
+
+func splitHeaderAndBody(data []byte, delimiterIdx int) ([]byte, []byte) {
+	headerByte := data[:delimiterIdx+len(DELIMITER)]
+	body := data[delimiterIdx+len(DELIMITER):]
+	return headerByte, body
+}
+
+func isHTTPHeader(buf []byte) bool {
+	lines := bytes.Split(buf, []byte("\r\n"))
+
+	startLine := string(lines[0])
+	if !requestLine.MatchString(startLine) && !responseLine.MatchString(startLine) {
+		return false
+	}
+
+	for _, line := range lines[1:] {
+		if len(line) == 0 {
+			break
+		}
+		colonIdx := bytes.IndexByte(line, ':')
+		if colonIdx <= 0 {
+			return false
+		}
+	}
+	return true
+}

internal/http/stream/reader.go

@@ -0,0 +1,50 @@
+package stream
+
+import (
+	"bytes"
+	"tunnel_pls/internal/http/header"
+)
+
+func (hs *http) Read(p []byte) (int, error) {
+	tmp := make([]byte, len(p))
+	read, err := hs.reader.Read(tmp)
+	if read == 0 && err != nil {
+		return 0, err
+	}
+
+	tmp = tmp[:read]
+
+	headerEndIdx := bytes.Index(tmp, DELIMITER)
+	if headerEndIdx == -1 {
+		return handleNoDelimiter(p, tmp, err)
+	}
+
+	headerByte, bodyByte := splitHeaderAndBody(tmp, headerEndIdx)
+
+	if !isHTTPHeader(headerByte) {
+		copy(p, tmp)
+		return read, nil
+	}
+
+	return hs.processHTTPRequest(p, headerByte, bodyByte)
+}
+
+func (hs *http) processHTTPRequest(p, headerByte, bodyByte []byte) (int, error) {
+	reqhf, err := header.NewRequest(headerByte)
+	if err != nil {
+		return 0, err
+	}
+
+	if err = hs.ApplyRequestMiddlewares(reqhf); err != nil {
+		return 0, err
+	}
+
+	hs.reqHeader = reqhf
+	combined := append(reqhf.Finalize(), bodyByte...)
+	return copy(p, combined), nil
+}
+
+func handleNoDelimiter(p, tmp []byte, err error) (int, error) {
+	copy(p, tmp)
+	return len(tmp), err
+}

internal/http/stream/stream.go

@@ -0,0 +1,103 @@
+package stream
+
+import (
+	"io"
+	"log"
+	"net"
+	"regexp"
+	"tunnel_pls/internal/http/header"
+	"tunnel_pls/internal/middleware"
+)
+
+var DELIMITER = []byte{0x0D, 0x0A, 0x0D, 0x0A}
+var requestLine = regexp.MustCompile(`^(GET|POST|PUT|DELETE|HEAD|OPTIONS|PATCH|TRACE|CONNECT) \S+ HTTP/\d\.\d$`)
+var responseLine = regexp.MustCompile(`^HTTP/\d\.\d \d{3} .+`)
+
+type HTTP interface {
+	io.ReadWriteCloser
+	CloseWrite() error
+	RemoteAddr() net.Addr
+	UseResponseMiddleware(mw middleware.ResponseMiddleware)
+	UseRequestMiddleware(mw middleware.RequestMiddleware)
+	SetRequestHeader(header header.RequestHeader)
+	RequestMiddlewares() []middleware.RequestMiddleware
+	ResponseMiddlewares() []middleware.ResponseMiddleware
+	ApplyResponseMiddlewares(resphf header.ResponseHeader, body []byte) error
+	ApplyRequestMiddlewares(reqhf header.RequestHeader) error
+}
+
+type http struct {
+	remoteAddr net.Addr
+	writer     io.Writer
+	reader     io.Reader
+	headerBuf  []byte
+	buf        []byte
+	respHeader header.ResponseHeader
+	reqHeader  header.RequestHeader
+	respMW     []middleware.ResponseMiddleware
+	reqMW      []middleware.RequestMiddleware
+}
+
+func New(writer io.Writer, reader io.Reader, remoteAddr net.Addr) HTTP {
+	return &http{
+		remoteAddr: remoteAddr,
+		writer:     writer,
+		reader:     reader,
+		buf:        make([]byte, 0, 4096),
+	}
+}
+
+func (hs *http) RemoteAddr() net.Addr {
+	return hs.remoteAddr
+}
+
+func (hs *http) UseResponseMiddleware(mw middleware.ResponseMiddleware) {
+	hs.respMW = append(hs.respMW, mw)
+}
+
+func (hs *http) UseRequestMiddleware(mw middleware.RequestMiddleware) {
+	hs.reqMW = append(hs.reqMW, mw)
+}
+
+func (hs *http) SetRequestHeader(header header.RequestHeader) {
+	hs.reqHeader = header
+}
+
+func (hs *http) RequestMiddlewares() []middleware.RequestMiddleware {
+	return hs.reqMW
+}
+
+func (hs *http) ResponseMiddlewares() []middleware.ResponseMiddleware {
+	return hs.respMW
+}
+
+func (hs *http) Close() error {
+	return hs.writer.(io.Closer).Close()
+}
+
+func (hs *http) CloseWrite() error {
+	if closer, ok := hs.writer.(interface{ CloseWrite() error }); ok {
+		return closer.CloseWrite()
+	}
+	return hs.Close()
+}
+
+func (hs *http) ApplyRequestMiddlewares(reqhf header.RequestHeader) error {
+	for _, m := range hs.RequestMiddlewares() {
+		if err := m.HandleRequest(reqhf); err != nil {
+			log.Printf("Error when applying request middleware: %v", err)
+			return err
+		}
+	}
+	return nil
+}
+
+func (hs *http) ApplyResponseMiddlewares(resphf header.ResponseHeader, bodyByte []byte) error {
+	for _, m := range hs.ResponseMiddlewares() {
+		if err := m.HandleResponse(resphf, bodyByte); err != nil {
+			log.Printf("Cannot apply middleware: %s\n", err)
+			return err
+		}
+	}
+	return nil
+}

internal/http/stream/writer.go

@@ -0,0 +1,88 @@
+package stream
+
+import (
+	"bytes"
+	"tunnel_pls/internal/http/header"
+)
+
+func (hs *http) Write(p []byte) (int, error) {
+	if hs.shouldBypassBuffering(p) {
+		hs.respHeader = nil
+	}
+
+	if hs.respHeader != nil {
+		return hs.writer.Write(p)
+	}
+
+	hs.buf = append(hs.buf, p...)
+
+	headerEndIdx := bytes.Index(hs.buf, DELIMITER)
+	if headerEndIdx == -1 {
+		return len(p), nil
+	}
+
+	return hs.processBufferedResponse(p, headerEndIdx)
+}
+
+func (hs *http) shouldBypassBuffering(p []byte) bool {
+	return hs.respHeader != nil && len(hs.buf) == 0 && len(p) >= 5 && string(p[0:5]) == "HTTP/"
+}
+
+func (hs *http) processBufferedResponse(p []byte, delimiterIdx int) (int, error) {
+	headerByte, bodyByte := splitHeaderAndBody(hs.buf, delimiterIdx)
+
+	if !isHTTPHeader(headerByte) {
+		return hs.writeRawBuffer()
+	}
+
+	if err := hs.processHTTPResponse(headerByte, bodyByte); err != nil {
+		return 0, err
+	}
+
+	hs.buf = nil
+	return len(p), nil
+}
+
+func (hs *http) writeRawBuffer() (int, error) {
+	_, err := hs.writer.Write(hs.buf)
+	length := len(hs.buf)
+	hs.buf = nil
+	if err != nil {
+		return 0, err
+	}
+	return length, nil
+}
+
+func (hs *http) processHTTPResponse(headerByte, bodyByte []byte) error {
+	resphf, err := header.NewResponse(headerByte)
+	if err != nil {
+		return err
+	}
+
+	if err = hs.ApplyResponseMiddlewares(resphf, bodyByte); err != nil {
+		return err
+	}
+
+	hs.respHeader = resphf
+	finalHeader := resphf.Finalize()
+
+	if err = hs.writeHeaderAndBody(finalHeader, bodyByte); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (hs *http) writeHeaderAndBody(header, bodyByte []byte) error {
+	if _, err := hs.writer.Write(header); err != nil {
+		return err
+	}
+
+	if len(bodyByte) > 0 {
+		if _, err := hs.writer.Write(bodyByte); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

internal/middleware/forwardedfor.go

@@ -0,0 +1,23 @@
+package middleware
+
+import (
+	"net"
+	"tunnel_pls/internal/http/header"
+)
+
+type ForwardedFor struct {
+	addr net.Addr
+}
+
+func NewForwardedFor(addr net.Addr) *ForwardedFor {
+	return &ForwardedFor{addr: addr}
+}
+
+func (ff *ForwardedFor) HandleRequest(header header.RequestHeader) error {
+	host, _, err := net.SplitHostPort(ff.addr.String())
+	if err != nil {
+		return err
+	}
+	header.Set("X-Forwarded-For", host)
+	return nil
+}

internal/middleware/middleware.go

@@ -0,0 +1,13 @@
+package middleware
+
+import (
+	"tunnel_pls/internal/http/header"
+)
+
+type RequestMiddleware interface {
+	HandleRequest(header header.RequestHeader) error
+}
+
+type ResponseMiddleware interface {
+	HandleResponse(header header.ResponseHeader, body []byte) error
+}

internal/middleware/tunnelfingerprint.go

@@ -0,0 +1,16 @@
+package middleware
+
+import (
+	"tunnel_pls/internal/http/header"
+)
+
+type TunnelFingerprint struct{}
+
+func NewTunnelFingerprint() *TunnelFingerprint {
+	return &TunnelFingerprint{}
+}
+
+func (h *TunnelFingerprint) HandleResponse(header header.ResponseHeader, body []byte) error {
+	header.Set("Server", "Tunnel Please")
+	return nil
+}

internal/port/port.go

@@ -6,37 +6,37 @@ import (
 	"sync"
 )
 
-type Registry interface {
-	AddPortRange(startPort, endPort uint16) error
-	GetUnassignedPort() (uint16, bool)
-	SetPortStatus(port uint16, assigned bool) error
-	ClaimPort(port uint16) (claimed bool)
+type Port interface {
+	AddRange(startPort, endPort uint16) error
+	Unassigned() (uint16, bool)
+	SetStatus(port uint16, assigned bool) error
+	Claim(port uint16) (claimed bool)
 }
 
-type registry struct {
+type port struct {
 	mu          sync.RWMutex
 	ports       map[uint16]bool
 	sortedPorts []uint16
 }
 
-func New() Registry {
-	return &registry{
+func New() Port {
+	return &port{
 		ports:       make(map[uint16]bool),
 		sortedPorts: []uint16{},
 	}
 }
 
-func (pm *registry) AddPortRange(startPort, endPort uint16) error {
+func (pm *port) AddRange(startPort, endPort uint16) error {
 	pm.mu.Lock()
 	defer pm.mu.Unlock()
 
 	if startPort > endPort {
 		return fmt.Errorf("start port cannot be greater than end port")
 	}
-	for port := startPort; port <= endPort; port++ {
-		if _, exists := pm.ports[port]; !exists {
-			pm.ports[port] = false
-			pm.sortedPorts = append(pm.sortedPorts, port)
+	for index := startPort; index <= endPort; index++ {
+		if _, exists := pm.ports[index]; !exists {
+			pm.ports[index] = false
+			pm.sortedPorts = append(pm.sortedPorts, index)
 		}
 	}
 	sort.Slice(pm.sortedPorts, func(i, j int) bool {
@@ -45,19 +45,19 @@ func (pm *registry) AddPortRange(startPort, endPort uint16) error {
 	return nil
 }
 
-func (pm *registry) GetUnassignedPort() (uint16, bool) {
+func (pm *port) Unassigned() (uint16, bool) {
 	pm.mu.Lock()
 	defer pm.mu.Unlock()
 
-	for _, port := range pm.sortedPorts {
-		if !pm.ports[port] {
-			return port, true
+	for _, index := range pm.sortedPorts {
+		if !pm.ports[index] {
+			return index, true
 		}
 	}
 	return 0, false
 }
 
-func (pm *registry) SetPortStatus(port uint16, assigned bool) error {
+func (pm *port) SetStatus(port uint16, assigned bool) error {
 	pm.mu.Lock()
 	defer pm.mu.Unlock()
 
@@ -65,7 +65,7 @@ func (pm *registry) SetPortStatus(port uint16, assigned bool) error {
 	return nil
 }
 
-func (pm *registry) ClaimPort(port uint16) (claimed bool) {
+func (pm *port) Claim(port uint16) (claimed bool) {
 	pm.mu.Lock()
 	defer pm.mu.Unlock()
 

internal/registry/registry.go

@@ -1,13 +1,25 @@
-package session
+package registry
 
 import (
 	"fmt"
 	"sync"
+	"tunnel_pls/session/forwarder"
+	"tunnel_pls/session/interaction"
+	"tunnel_pls/session/lifecycle"
+	"tunnel_pls/session/slug"
 	"tunnel_pls/types"
 )
 
 type Key = types.SessionKey
 
+type Session interface {
+	Lifecycle() lifecycle.Lifecycle
+	Interaction() interaction.Interaction
+	Forwarder() forwarder.Forwarder
+	Slug() slug.Slug
+	Detail() *types.Detail
+}
+
 type Registry interface {
 	Get(key Key) (session Session, err error)
 	GetWithUser(user string, key Key) (session Session, err error)
@@ -22,6 +34,15 @@ type registry struct {
 	slugIndex map[Key]string
 }
 
+var (
+	ErrSessionNotFound      = fmt.Errorf("session not found")
+	ErrSlugInUse            = fmt.Errorf("slug already in use")
+	ErrInvalidSlug          = fmt.Errorf("invalid slug")
+	ErrForbiddenSlug        = fmt.Errorf("forbidden slug")
+	ErrSlugChangeNotAllowed = fmt.Errorf("slug change not allowed for this tunnel type")
+	ErrSlugUnchanged        = fmt.Errorf("slug is unchanged")
+)
+
 func NewRegistry() Registry {
 	return &registry{
 		byUser:    make(map[string]map[Key]Session),
@@ -35,12 +56,12 @@ func (r *registry) Get(key Key) (session Session, err error) {
 
 	userID, ok := r.slugIndex[key]
 	if !ok {
-		return nil, fmt.Errorf("session not found")
+		return nil, ErrSessionNotFound
 	}
 
 	client, ok := r.byUser[userID][key]
 	if !ok {
-		return nil, fmt.Errorf("session not found")
+		return nil, ErrSessionNotFound
 	}
 	return client, nil
 }
@@ -51,37 +72,37 @@ func (r *registry) GetWithUser(user string, key Key) (session Session, err error
 
 	client, ok := r.byUser[user][key]
 	if !ok {
-		return nil, fmt.Errorf("session not found")
+		return nil, ErrSessionNotFound
 	}
 	return client, nil
 }
 
 func (r *registry) Update(user string, oldKey, newKey Key) error {
 	if oldKey.Type != newKey.Type {
-		return fmt.Errorf("tunnel type cannot change")
+		return ErrSlugUnchanged
 	}
 
-	if newKey.Type != types.HTTP {
-		return fmt.Errorf("non http tunnel cannot change slug")
+	if newKey.Type != types.TunnelTypeHTTP {
+		return ErrSlugChangeNotAllowed
 	}
 
 	if isForbiddenSlug(newKey.Id) {
-		return fmt.Errorf("this subdomain is reserved. Please choose a different one")
+		return ErrForbiddenSlug
 	}
 
 	if !isValidSlug(newKey.Id) {
-		return fmt.Errorf("invalid subdomain. Follow the rules")
+		return ErrInvalidSlug
 	}
 
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
 	if _, exists := r.slugIndex[newKey]; exists && newKey != oldKey {
-		return fmt.Errorf("someone already uses this subdomain")
+		return ErrSlugInUse
 	}
 	client, ok := r.byUser[user][oldKey]
 	if !ok {
-		return fmt.Errorf("session not found")
+		return ErrSessionNotFound
 	}
 
 	delete(r.byUser[user], oldKey)
@@ -97,7 +118,7 @@ func (r *registry) Update(user string, oldKey, newKey Key) error {
 	return nil
 }
 
-func (r *registry) Register(key Key, session Session) (success bool) {
+func (r *registry) Register(key Key, userSession Session) (success bool) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
@@ -105,12 +126,12 @@ func (r *registry) Register(key Key, session Session) (success bool) {
 		return false
 	}
 
-	userID := session.Lifecycle().User()
+	userID := userSession.Lifecycle().User()
 	if r.byUser[userID] == nil {
 		r.byUser[userID] = make(map[Key]Session)
 	}
 
-	r.byUser[userID][key] = session
+	r.byUser[userID][key] = userSession
 	r.slugIndex[key] = userID
 	return true
 }

internal/transport/http.go

@@ -0,0 +1,40 @@
+package transport
+
+import (
+	"errors"
+	"log"
+	"net"
+	"tunnel_pls/internal/registry"
+)
+
+type httpServer struct {
+	handler *httpHandler
+	port    string
+}
+
+func NewHTTPServer(domain, port string, sessionRegistry registry.Registry, redirectTLS bool) Transport {
+	return &httpServer{
+		handler: newHTTPHandler(domain, sessionRegistry, redirectTLS),
+		port:    port,
+	}
+}
+
+func (ht *httpServer) Listen() (net.Listener, error) {
+	return net.Listen("tcp", ":"+ht.port)
+}
+
+func (ht *httpServer) Serve(listener net.Listener) error {
+	log.Printf("HTTP server is starting on port %s", ht.port)
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			if errors.Is(err, net.ErrClosed) {
+				return err
+			}
+			log.Printf("Error accepting connection: %v", err)
+			continue
+		}
+
+		go ht.handler.handler(conn, false)
+	}
+}

internal/transport/httphandler.go

@@ -0,0 +1,231 @@
+package transport
+
+import (
+	"bufio"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+	"tunnel_pls/internal/http/header"
+	"tunnel_pls/internal/http/stream"
+	"tunnel_pls/internal/middleware"
+	"tunnel_pls/internal/registry"
+	"tunnel_pls/types"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type httpHandler struct {
+	domain          string
+	sessionRegistry registry.Registry
+	redirectTLS     bool
+}
+
+func newHTTPHandler(domain string, sessionRegistry registry.Registry, redirectTLS bool) *httpHandler {
+	return &httpHandler{
+		domain:          domain,
+		sessionRegistry: sessionRegistry,
+		redirectTLS:     redirectTLS,
+	}
+}
+
+func (hh *httpHandler) redirect(conn net.Conn, status int, location string) error {
+	_, err := conn.Write([]byte(fmt.Sprintf("HTTP/1.1 %d Moved Permanently\r\n", status) +
+		fmt.Sprintf("Location: %s", location) +
+		"Content-Length: 0\r\n" +
+		"Connection: close\r\n" +
+		"\r\n"))
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (hh *httpHandler) badRequest(conn net.Conn) error {
+	if _, err := conn.Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\n")); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (hh *httpHandler) handler(conn net.Conn, isTLS bool) {
+	defer hh.closeConnection(conn)
+
+	dstReader := bufio.NewReader(conn)
+	reqhf, err := header.NewRequest(dstReader)
+	if err != nil {
+		log.Printf("Error creating request header: %v", err)
+		return
+	}
+
+	slug, err := hh.extractSlug(reqhf)
+	if err != nil {
+		_ = hh.badRequest(conn)
+		return
+	}
+
+	if hh.shouldRedirectToTLS(isTLS) {
+		_ = hh.redirect(conn, http.StatusMovedPermanently, fmt.Sprintf("Location: https://%s.%s/\r\n", slug, hh.domain))
+		return
+	}
+
+	if hh.handlePingRequest(slug, conn) {
+		return
+	}
+
+	sshSession, err := hh.getSession(slug)
+	if err != nil {
+		_ = hh.redirect(conn, http.StatusMovedPermanently, fmt.Sprintf("https://tunnl.live/tunnel-not-found?slug=%s\r\n", slug))
+		return
+	}
+
+	hw := stream.New(conn, dstReader, conn.RemoteAddr())
+	defer func(hw stream.HTTP) {
+		err = hw.Close()
+		if err != nil {
+			log.Printf("Error closing HTTP stream: %v", err)
+		}
+	}(hw)
+	hh.forwardRequest(hw, reqhf, sshSession)
+}
+
+func (hh *httpHandler) closeConnection(conn net.Conn) {
+	err := conn.Close()
+	if err != nil && !errors.Is(err, net.ErrClosed) {
+		log.Printf("Error closing connection: %v", err)
+	}
+}
+
+func (hh *httpHandler) extractSlug(reqhf header.RequestHeader) (string, error) {
+	host := strings.Split(reqhf.Value("Host"), ".")
+	if len(host) < 1 {
+		return "", errors.New("invalid host")
+	}
+	return host[0], nil
+}
+
+func (hh *httpHandler) shouldRedirectToTLS(isTLS bool) bool {
+	return !isTLS && hh.redirectTLS
+}
+
+func (hh *httpHandler) handlePingRequest(slug string, conn net.Conn) bool {
+	if slug != "ping" {
+		return false
+	}
+
+	_, err := conn.Write([]byte(
+		"HTTP/1.1 200 OK\r\n" +
+			"Content-Length: 0\r\n" +
+			"Connection: close\r\n" +
+			"Access-Control-Allow-Origin: *\r\n" +
+			"Access-Control-Allow-Methods: GET, HEAD, OPTIONS\r\n" +
+			"Access-Control-Allow-Headers: *\r\n" +
+			"\r\n",
+	))
+	if err != nil {
+		log.Println("Failed to write 200 OK:", err)
+	}
+	return true
+}
+
+func (hh *httpHandler) getSession(slug string) (registry.Session, error) {
+	sshSession, err := hh.sessionRegistry.Get(types.SessionKey{
+		Id:   slug,
+		Type: types.TunnelTypeHTTP,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return sshSession, nil
+}
+
+func (hh *httpHandler) forwardRequest(hw stream.HTTP, initialRequest header.RequestHeader, sshSession registry.Session) {
+	channel, err := hh.openForwardedChannel(hw, sshSession)
+	if err != nil {
+		log.Printf("Failed to establish channel: %v", err)
+		sshSession.Forwarder().WriteBadGatewayResponse(hw)
+		return
+	}
+
+	defer func() {
+		err = channel.Close()
+		if err != nil && !errors.Is(err, io.EOF) {
+			log.Printf("Error closing forwarded channel: %v", err)
+		}
+	}()
+
+	hh.setupMiddlewares(hw)
+
+	if err = hh.sendInitialRequest(hw, initialRequest, channel); err != nil {
+		log.Printf("Failed to forward initial request: %v", err)
+		return
+	}
+	sshSession.Forwarder().HandleConnection(hw, channel)
+}
+
+func (hh *httpHandler) openForwardedChannel(hw stream.HTTP, sshSession registry.Session) (ssh.Channel, error) {
+	payload := sshSession.Forwarder().CreateForwardedTCPIPPayload(hw.RemoteAddr())
+
+	type channelResult struct {
+		channel ssh.Channel
+		reqs    <-chan *ssh.Request
+		err     error
+	}
+
+	resultChan := make(chan channelResult, 1)
+
+	go func() {
+		channel, reqs, err := sshSession.Lifecycle().Connection().OpenChannel("forwarded-tcpip", payload)
+		select {
+		case resultChan <- channelResult{channel, reqs, err}:
+		default:
+			hh.cleanupUnusedChannel(channel, reqs)
+		}
+	}()
+
+	select {
+	case result := <-resultChan:
+		if result.err != nil {
+			return nil, result.err
+		}
+		go ssh.DiscardRequests(result.reqs)
+		return result.channel, nil
+	case <-time.After(5 * time.Second):
+		return nil, errors.New("timeout opening forwarded-tcpip channel")
+	}
+}
+
+func (hh *httpHandler) cleanupUnusedChannel(channel ssh.Channel, reqs <-chan *ssh.Request) {
+	if channel != nil {
+		if err := channel.Close(); err != nil {
+			log.Printf("Failed to close unused channel: %v", err)
+		}
+		go ssh.DiscardRequests(reqs)
+	}
+}
+
+func (hh *httpHandler) setupMiddlewares(hw stream.HTTP) {
+	fingerprintMiddleware := middleware.NewTunnelFingerprint()
+	forwardedForMiddleware := middleware.NewForwardedFor(hw.RemoteAddr())
+
+	hw.UseResponseMiddleware(fingerprintMiddleware)
+	hw.UseRequestMiddleware(forwardedForMiddleware)
+}
+
+func (hh *httpHandler) sendInitialRequest(hw stream.HTTP, initialRequest header.RequestHeader, channel ssh.Channel) error {
+	hw.SetRequestHeader(initialRequest)
+
+	if err := hw.ApplyRequestMiddlewares(initialRequest); err != nil {
+		return fmt.Errorf("error applying request middlewares: %w", err)
+	}
+
+	if _, err := channel.Write(initialRequest.Finalize()); err != nil {
+		return fmt.Errorf("error writing to channel: %w", err)
+	}
+
+	return nil
+}

internal/transport/https.go

@@ -0,0 +1,45 @@
+package transport
+
+import (
+	"crypto/tls"
+	"errors"
+	"log"
+	"net"
+	"tunnel_pls/internal/registry"
+)
+
+type https struct {
+	tlsConfig   *tls.Config
+	httpHandler *httpHandler
+	domain      string
+	port        string
+}
+
+func NewHTTPSServer(domain, port string, sessionRegistry registry.Registry, redirectTLS bool, tlsConfig *tls.Config) Transport {
+	return &https{
+		tlsConfig:   tlsConfig,
+		httpHandler: newHTTPHandler(domain, sessionRegistry, redirectTLS),
+		domain:      domain,
+		port:        port,
+	}
+}
+
+func (ht *https) Listen() (net.Listener, error) {
+	return tls.Listen("tcp", ":"+ht.port, ht.tlsConfig)
+}
+
+func (ht *https) Serve(listener net.Listener) error {
+	log.Printf("HTTPS server is starting on port %s", ht.port)
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			if errors.Is(err, net.ErrClosed) {
+				return err
+			}
+			log.Printf("Error accepting connection: %v", err)
+			continue
+		}
+
+		go ht.httpHandler.handler(conn, true)
+	}
+}

internal/transport/tcp.go

@@ -0,0 +1,66 @@
+package transport
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type tcp struct {
+	port      uint16
+	forwarder forwarder
+}
+
+type forwarder interface {
+	CreateForwardedTCPIPPayload(origin net.Addr) []byte
+	OpenForwardedChannel(payload []byte) (ssh.Channel, <-chan *ssh.Request, error)
+	HandleConnection(dst io.ReadWriter, src ssh.Channel)
+}
+
+func NewTCPServer(port uint16, forwarder forwarder) Transport {
+	return &tcp{
+		port:      port,
+		forwarder: forwarder,
+	}
+}
+
+func (tt *tcp) Listen() (net.Listener, error) {
+	return net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", tt.port))
+}
+
+func (tt *tcp) Serve(listener net.Listener) error {
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			if errors.Is(err, net.ErrClosed) {
+				return nil
+			}
+			log.Printf("Error accepting connection: %v", err)
+			continue
+		}
+		go tt.handleTcp(conn)
+	}
+}
+
+func (tt *tcp) handleTcp(conn net.Conn) {
+	defer func() {
+		err := conn.Close()
+		if err != nil {
+			log.Printf("Failed to close connection: %v", err)
+		}
+	}()
+	payload := tt.forwarder.CreateForwardedTCPIPPayload(conn.RemoteAddr())
+	channel, reqs, err := tt.forwarder.OpenForwardedChannel(payload)
+	if err != nil {
+		log.Printf("Failed to open forwarded-tcpip channel: %v", err)
+
+		return
+	}
+
+	go ssh.DiscardRequests(reqs)
+	tt.forwarder.HandleConnection(conn, channel)
+}

internal/transport/tls.go

@@ -1,4 +1,4 @@
-package server
+package transport
 
 import (
 	"context"
@@ -26,7 +26,8 @@ type TLSManager interface {
 }
 
 type tlsManager struct {
-	domain      string
+	config config.Config
+
 	certPath    string
 	keyPath     string
 	storagePath string
@@ -42,7 +43,7 @@ type tlsManager struct {
 var globalTLSManager TLSManager
 var tlsManagerOnce sync.Once
 
-func NewTLSConfig(domain string) (*tls.Config, error) {
+func NewTLSConfig(config config.Config) (*tls.Config, error) {
 	var initErr error
 
 	tlsManagerOnce.Do(func() {
@@ -51,7 +52,7 @@ func NewTLSConfig(domain string) (*tls.Config, error) {
 		storagePath := "certs/tls/certmagic"
 
 		tm := &tlsManager{
-			domain:      domain,
+			config:      config,
 			certPath:    certPath,
 			keyPath:     keyPath,
 			storagePath: storagePath,
@@ -66,14 +67,7 @@ func NewTLSConfig(domain string) (*tls.Config, error) {
 			tm.useCertMagic = false
 			tm.startCertWatcher()
 		} else {
-			if !isACMEConfigComplete() {
-				log.Printf("User certificates missing or invalid, and ACME configuration is incomplete")
-				log.Printf("To enable automatic certificate generation, set CF_API_TOKEN environment variable")
-				initErr = fmt.Errorf("no valid certificates found and ACME configuration is incomplete (CF_API_TOKEN is required)")
-				return
-			}
-
-			log.Printf("User certificates missing or don't cover %s and *.%s, using CertMagic", domain, domain)
+			log.Printf("User certificates missing or don't cover %s and *.%s, using CertMagic", config.Domain(), config.Domain())
 			if err := tm.initCertMagic(); err != nil {
 				initErr = fmt.Errorf("failed to initialize CertMagic: %w", err)
 				return
@@ -91,11 +85,6 @@ func NewTLSConfig(domain string) (*tls.Config, error) {
 	return globalTLSManager.getTLSConfig(), nil
 }
 
-func isACMEConfigComplete() bool {
-	cfAPIToken := config.Getenv("CF_API_TOKEN", "")
-	return cfAPIToken != ""
-}
-
 func (tm *tlsManager) userCertsExistAndValid() bool {
 	if _, err := os.Stat(tm.certPath); os.IsNotExist(err) {
 		log.Printf("Certificate file not found: %s", tm.certPath)
@@ -106,7 +95,7 @@ func (tm *tlsManager) userCertsExistAndValid() bool {
 		return false
 	}
 
-	return ValidateCertDomains(tm.certPath, tm.domain)
+	return ValidateCertDomains(tm.certPath, tm.config.Domain())
 }
 
 func ValidateCertDomains(certPath, domain string) bool {
@@ -206,15 +195,9 @@ func (tm *tlsManager) startCertWatcher() {
 			if certInfo.ModTime().After(lastCertMod) || keyInfo.ModTime().After(lastKeyMod) {
 				log.Printf("Certificate files changed, reloading...")
 
-				if !ValidateCertDomains(tm.certPath, tm.domain) {
+				if !ValidateCertDomains(tm.certPath, tm.config.Domain()) {
 					log.Printf("New certificates don't cover required domains")
 
-					if !isACMEConfigComplete() {
-						log.Printf("Cannot switch to CertMagic: ACME configuration is incomplete (CF_API_TOKEN is required)")
-						continue
-					}
-
-					log.Printf("Switching to CertMagic for automatic certificate management")
 					if err := tm.initCertMagic(); err != nil {
 						log.Printf("Failed to initialize CertMagic: %v", err)
 						continue
@@ -241,16 +224,12 @@ func (tm *tlsManager) initCertMagic() error {
 		return fmt.Errorf("failed to create cert storage directory: %w", err)
 	}
 
-	acmeEmail := config.Getenv("ACME_EMAIL", "admin@"+tm.domain)
-	cfAPIToken := config.Getenv("CF_API_TOKEN", "")
-	acmeStaging := config.Getenv("ACME_STAGING", "false") == "true"
-
-	if cfAPIToken == "" {
+	if tm.config.CFAPIToken() == "" {
 		return fmt.Errorf("CF_API_TOKEN environment variable is required for automatic certificate generation")
 	}
 
 	cfProvider := &cloudflare.Provider{
-		APIToken: cfAPIToken,
+		APIToken: tm.config.CFAPIToken(),
 	}
 
 	storage := &certmagic.FileStorage{Path: tm.storagePath}
@@ -266,7 +245,7 @@ func (tm *tlsManager) initCertMagic() error {
 	})
 
 	acmeIssuer := certmagic.NewACMEIssuer(magic, certmagic.ACMEIssuer{
-		Email:  acmeEmail,
+		Email:  tm.config.ACMEEmail(),
 		Agreed: true,
 		DNS01Solver: &certmagic.DNS01Solver{
 			DNSManager: certmagic.DNSManager{
@@ -275,7 +254,7 @@ func (tm *tlsManager) initCertMagic() error {
 		},
 	})
 
-	if acmeStaging {
+	if tm.config.ACMEStaging() {
 		acmeIssuer.CA = certmagic.LetsEncryptStagingCA
 		log.Printf("Using Let's Encrypt staging server")
 	} else {
@@ -286,7 +265,7 @@ func (tm *tlsManager) initCertMagic() error {
 	magic.Issuers = []certmagic.Issuer{acmeIssuer}
 	tm.magic = magic
 
-	domains := []string{tm.domain, "*." + tm.domain}
+	domains := []string{tm.config.Domain(), "*." + tm.config.Domain()}
 	log.Printf("Requesting certificates for: %v", domains)
 
 	ctx := context.Background()

internal/transport/transport.go

@@ -0,0 +1,10 @@
+package transport
+
+import (
+	"net"
+)
+
+type Transport interface {
+	Listen() (net.Listener, error)
+	Serve(listener net.Listener) error
+}

main.go

@@ -4,21 +4,22 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"net"
 	"net/http"
 	_ "net/http/pprof"
 	"os"
 	"os/signal"
-	"strconv"
-	"strings"
 	"syscall"
 	"time"
 	"tunnel_pls/internal/config"
 	"tunnel_pls/internal/grpc/client"
 	"tunnel_pls/internal/key"
 	"tunnel_pls/internal/port"
+	"tunnel_pls/internal/registry"
+	"tunnel_pls/internal/transport"
+	"tunnel_pls/internal/version"
 	"tunnel_pls/server"
-	"tunnel_pls/session"
-	"tunnel_pls/version"
+	"tunnel_pls/types"
 
 	"golang.org/x/crypto/ssh"
 )
@@ -34,27 +35,12 @@ func main() {
 
 	log.Printf("Starting %s", version.GetVersion())
 
-	err := config.Load()
+	conf, err := config.MustLoad()
 	if err != nil {
 		log.Fatalf("Failed to load configuration: %s", err)
 		return
 	}
 
-	mode := strings.ToLower(config.Getenv("MODE", "standalone"))
-	isNodeMode := mode == "node"
-
-	pprofEnabled := config.Getenv("PPROF_ENABLED", "false")
-	if pprofEnabled == "true" {
-		pprofPort := config.Getenv("PPROF_PORT", "6060")
-		go func() {
-			pprofAddr := fmt.Sprintf("localhost:%s", pprofPort)
-			log.Printf("Starting pprof server on http://%s/debug/pprof/", pprofAddr)
-			if err = http.ListenAndServe(pprofAddr, nil); err != nil {
-				log.Printf("pprof server error: %v", err)
-			}
-		}()
-	}
-
 	sshConfig := &ssh.ServerConfig{
 		NoClientAuth:  true,
 		ServerVersion: fmt.Sprintf("SSH-2.0-TunnelPlease-%s", version.GetShortVersion()),
@@ -76,7 +62,7 @@ func main() {
 	}
 
 	sshConfig.AddHostKey(private)
-	sessionRegistry := session.NewRegistry()
+	sessionRegistry := registry.NewRegistry()
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -86,16 +72,11 @@ func main() {
 	signal.Notify(shutdownChan, os.Interrupt, syscall.SIGTERM)
 
 	var grpcClient client.Client
-	if isNodeMode {
-		grpcHost := config.Getenv("GRPC_ADDRESS", "localhost")
-		grpcPort := config.Getenv("GRPC_PORT", "8080")
-		grpcAddr := fmt.Sprintf("%s:%s", grpcHost, grpcPort)
-		nodeToken := config.Getenv("NODE_TOKEN", "")
-		if nodeToken == "" {
-			log.Fatalf("NODE_TOKEN is required in node mode")
-		}
 
-		grpcClient, err = client.New(grpcAddr, sessionRegistry)
+	if conf.Mode() == types.ServerModeNODE {
+		grpcAddr := fmt.Sprintf("%s:%s", conf.GRPCAddress(), conf.GRPCPort())
+
+		grpcClient, err = client.New(conf, grpcAddr, sessionRegistry)
 		if err != nil {
 			log.Fatalf("failed to create grpc client: %v", err)
 		}
@@ -108,47 +89,73 @@ func main() {
 		healthCancel()
 
 		go func() {
-			identity := config.Getenv("DOMAIN", "localhost")
-			if err = grpcClient.SubscribeEvents(ctx, identity, nodeToken); err != nil {
+			if err = grpcClient.SubscribeEvents(ctx, conf.Domain(), conf.NodeToken()); err != nil {
 				errChan <- fmt.Errorf("failed to subscribe to events: %w", err)
 			}
 		}()
 	}
 
-	portManager := port.New()
-	rawRange := config.Getenv("ALLOWED_PORTS", "")
-	if rawRange != "" {
-		splitRange := strings.Split(rawRange, "-")
-		if len(splitRange) == 2 {
-			var start, end uint64
-			start, err = strconv.ParseUint(splitRange[0], 10, 16)
-			if err != nil {
-				log.Fatalf("Failed to parse start port: %s", err)
-			}
-
-			end, err = strconv.ParseUint(splitRange[1], 10, 16)
-			if err != nil {
-				log.Fatalf("Failed to parse end port: %s", err)
-			}
-
-			if err = portManager.AddPortRange(uint16(start), uint16(end)); err != nil {
-				log.Fatalf("Failed to add port range: %s", err)
-			}
-			log.Printf("PortRegistry range configured: %d-%d", start, end)
-		} else {
-			log.Printf("Invalid ALLOWED_PORTS format, expected 'start-end', got: %s", rawRange)
+	go func() {
+		var httpListener net.Listener
+		httpserver := transport.NewHTTPServer(conf.Domain(), conf.HTTPPort(), sessionRegistry, conf.TLSRedirect())
+		httpListener, err = httpserver.Listen()
+		if err != nil {
+			errChan <- fmt.Errorf("failed to start http server: %w", err)
+			return
 		}
+		err = httpserver.Serve(httpListener)
+		if err != nil {
+			errChan <- fmt.Errorf("error when serving http server: %w", err)
+			return
+		}
+	}()
+
+	if conf.TLSEnabled() {
+		go func() {
+			var httpsListener net.Listener
+			tlsConfig, _ := transport.NewTLSConfig(conf)
+			httpsServer := transport.NewHTTPSServer(conf.Domain(), conf.HTTPSPort(), sessionRegistry, conf.TLSRedirect(), tlsConfig)
+			httpsListener, err = httpsServer.Listen()
+			if err != nil {
+				errChan <- fmt.Errorf("failed to start http server: %w", err)
+				return
+			}
+			err = httpsServer.Serve(httpsListener)
+			if err != nil {
+				errChan <- fmt.Errorf("error when serving http server: %w", err)
+				return
+			}
+		}()
 	}
+	
+	portManager := port.New()
+	err = portManager.AddRange(conf.AllowedPortsStart(), conf.AllowedPortsEnd())
+	if err != nil {
+		log.Fatalf("Failed to initialize port manager: %s", err)
+		return
+	}
+
 	var app server.Server
 	go func() {
-		app, err = server.New(sshConfig, sessionRegistry, grpcClient, portManager)
+		app, err = server.New(conf, sshConfig, sessionRegistry, grpcClient, portManager, conf.SSHPort())
 		if err != nil {
 			errChan <- fmt.Errorf("failed to start server: %s", err)
 			return
 		}
 		app.Start()
+
 	}()
 
+	if conf.PprofEnabled() {
+		go func() {
+			pprofAddr := fmt.Sprintf("localhost:%s", conf.PprofPort())
+			log.Printf("Starting pprof server on http://%s/debug/pprof/", pprofAddr)
+			if err = http.ListenAndServe(pprofAddr, nil); err != nil {
+				log.Printf("pprof server error: %v", err)
+			}
+		}()
+	}
+
 	select {
 	case err = <-errChan:
 		log.Printf("error happen : %s", err)

server/header.go

@@ -1,276 +0,0 @@
-package server
-
-import (
-	"bufio"
-	"bytes"
-	"fmt"
-)
-
-type HeaderManager interface {
-	Get(key string) []byte
-	Set(key string, value []byte)
-	Remove(key string)
-	Finalize() []byte
-}
-
-type ResponseHeaderManager interface {
-	Get(key string) string
-	Set(key string, value string)
-	Remove(key string)
-	Finalize() []byte
-}
-
-type RequestHeaderManager interface {
-	Get(key string) string
-	Set(key string, value string)
-	Remove(key string)
-	Finalize() []byte
-	GetMethod() string
-	GetPath() string
-	GetVersion() string
-}
-
-type responseHeaderFactory struct {
-	startLine []byte
-	headers   map[string]string
-}
-
-type requestHeaderFactory struct {
-	method    string
-	path      string
-	version   string
-	startLine []byte
-	headers   map[string]string
-}
-
-func NewRequestHeaderFactory(r interface{}) (RequestHeaderManager, error) {
-	switch v := r.(type) {
-	case []byte:
-		return parseHeadersFromBytes(v)
-	case *bufio.Reader:
-		return parseHeadersFromReader(v)
-	default:
-		return nil, fmt.Errorf("unsupported type: %T", r)
-	}
-}
-
-func parseHeadersFromBytes(headerData []byte) (RequestHeaderManager, error) {
-	header := &requestHeaderFactory{
-		headers: make(map[string]string, 16),
-	}
-
-	lineEnd := bytes.IndexByte(headerData, '\n')
-	if lineEnd == -1 {
-		return nil, fmt.Errorf("invalid request: no newline found")
-	}
-
-	startLine := bytes.TrimRight(headerData[:lineEnd], "\r\n")
-	header.startLine = make([]byte, len(startLine))
-	copy(header.startLine, startLine)
-
-	parts := bytes.Split(startLine, []byte{' '})
-	if len(parts) < 3 {
-		return nil, fmt.Errorf("invalid request line")
-	}
-
-	header.method = string(parts[0])
-	header.path = string(parts[1])
-	header.version = string(parts[2])
-
-	remaining := headerData[lineEnd+1:]
-
-	for len(remaining) > 0 {
-		lineEnd = bytes.IndexByte(remaining, '\n')
-		if lineEnd == -1 {
-			lineEnd = len(remaining)
-		}
-
-		line := bytes.TrimRight(remaining[:lineEnd], "\r\n")
-
-		if len(line) == 0 {
-			break
-		}
-
-		colonIdx := bytes.IndexByte(line, ':')
-		if colonIdx != -1 {
-			key := bytes.TrimSpace(line[:colonIdx])
-			value := bytes.TrimSpace(line[colonIdx+1:])
-			header.headers[string(key)] = string(value)
-		}
-
-		if lineEnd == len(remaining) {
-			break
-		}
-		remaining = remaining[lineEnd+1:]
-	}
-
-	return header, nil
-}
-
-func parseHeadersFromReader(br *bufio.Reader) (RequestHeaderManager, error) {
-	header := &requestHeaderFactory{
-		headers: make(map[string]string, 16),
-	}
-
-	startLineBytes, err := br.ReadSlice('\n')
-	if err != nil {
-		if err == bufio.ErrBufferFull {
-			var startLine string
-			startLine, err = br.ReadString('\n')
-			if err != nil {
-				return nil, err
-			}
-			startLineBytes = []byte(startLine)
-		} else {
-			return nil, err
-		}
-	}
-
-	startLineBytes = bytes.TrimRight(startLineBytes, "\r\n")
-	header.startLine = make([]byte, len(startLineBytes))
-	copy(header.startLine, startLineBytes)
-
-	parts := bytes.Split(startLineBytes, []byte{' '})
-	if len(parts) < 3 {
-		return nil, fmt.Errorf("invalid request line")
-	}
-
-	header.method = string(parts[0])
-	header.path = string(parts[1])
-	header.version = string(parts[2])
-
-	for {
-		lineBytes, err := br.ReadSlice('\n')
-		if err != nil {
-			if err == bufio.ErrBufferFull {
-				var line string
-				line, err = br.ReadString('\n')
-				if err != nil {
-					return nil, err
-				}
-				lineBytes = []byte(line)
-			} else {
-				return nil, err
-			}
-		}
-
-		lineBytes = bytes.TrimRight(lineBytes, "\r\n")
-
-		if len(lineBytes) == 0 {
-			break
-		}
-
-		colonIdx := bytes.IndexByte(lineBytes, ':')
-		if colonIdx == -1 {
-			continue
-		}
-
-		key := bytes.TrimSpace(lineBytes[:colonIdx])
-		value := bytes.TrimSpace(lineBytes[colonIdx+1:])
-
-		header.headers[string(key)] = string(value)
-	}
-
-	return header, nil
-}
-
-func NewResponseHeaderFactory(startLine []byte) ResponseHeaderManager {
-	header := &responseHeaderFactory{
-		startLine: nil,
-		headers:   make(map[string]string),
-	}
-	lines := bytes.Split(startLine, []byte("\r\n"))
-	if len(lines) == 0 {
-		return header
-	}
-	header.startLine = lines[0]
-	for _, h := range lines[1:] {
-		if len(h) == 0 {
-			continue
-		}
-
-		parts := bytes.SplitN(h, []byte(":"), 2)
-		if len(parts) < 2 {
-			continue
-		}
-
-		key := parts[0]
-		val := bytes.TrimSpace(parts[1])
-		header.headers[string(key)] = string(val)
-	}
-	return header
-}
-
-func (resp *responseHeaderFactory) Get(key string) string {
-	return resp.headers[key]
-}
-
-func (resp *responseHeaderFactory) Set(key string, value string) {
-	resp.headers[key] = value
-}
-
-func (resp *responseHeaderFactory) Remove(key string) {
-	delete(resp.headers, key)
-}
-
-func (resp *responseHeaderFactory) Finalize() []byte {
-	var buf bytes.Buffer
-
-	buf.Write(resp.startLine)
-	buf.WriteString("\r\n")
-
-	for key, val := range resp.headers {
-		buf.WriteString(key)
-		buf.WriteString(": ")
-		buf.WriteString(val)
-		buf.WriteString("\r\n")
-	}
-
-	buf.WriteString("\r\n")
-	return buf.Bytes()
-}
-
-func (req *requestHeaderFactory) Get(key string) string {
-	val, ok := req.headers[key]
-	if !ok {
-		return ""
-	}
-	return val
-}
-
-func (req *requestHeaderFactory) Set(key string, value string) {
-	req.headers[key] = value
-}
-
-func (req *requestHeaderFactory) Remove(key string) {
-	delete(req.headers, key)
-}
-
-func (req *requestHeaderFactory) GetMethod() string {
-	return req.method
-}
-
-func (req *requestHeaderFactory) GetPath() string {
-	return req.path
-}
-
-func (req *requestHeaderFactory) GetVersion() string {
-	return req.version
-}
-
-func (req *requestHeaderFactory) Finalize() []byte {
-	var buf bytes.Buffer
-
-	buf.Write(req.startLine)
-	buf.WriteString("\r\n")
-
-	for key, val := range req.headers {
-		buf.WriteString(key)
-		buf.WriteString(": ")
-		buf.WriteString(val)
-		buf.WriteString("\r\n")
-	}
-
-	buf.WriteString("\r\n")
-	return buf.Bytes()
-}

server/http.go

@@ -1,395 +0,0 @@
-package server
-
-import (
-	"bufio"
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"regexp"
-	"strings"
-	"time"
-	"tunnel_pls/internal/config"
-	"tunnel_pls/session"
-	"tunnel_pls/types"
-
-	"golang.org/x/crypto/ssh"
-)
-
-type HTTPWriter interface {
-	io.Reader
-	io.Writer
-	GetRemoteAddr() net.Addr
-	GetWriter() io.Writer
-	AddResponseMiddleware(mw ResponseMiddleware)
-	AddRequestStartMiddleware(mw RequestMiddleware)
-	SetRequestHeader(header RequestHeaderManager)
-	GetRequestStartMiddleware() []RequestMiddleware
-}
-
-type customWriter struct {
-	remoteAddr net.Addr
-	writer     io.Writer
-	reader     io.Reader
-	headerBuf  []byte
-	buf        []byte
-	respHeader ResponseHeaderManager
-	reqHeader  RequestHeaderManager
-	respMW     []ResponseMiddleware
-	reqStartMW []RequestMiddleware
-	reqEndMW   []RequestMiddleware
-}
-
-func (cw *customWriter) GetRemoteAddr() net.Addr {
-	return cw.remoteAddr
-}
-
-func (cw *customWriter) GetWriter() io.Writer {
-	return cw.writer
-}
-
-func (cw *customWriter) AddResponseMiddleware(mw ResponseMiddleware) {
-	cw.respMW = append(cw.respMW, mw)
-}
-
-func (cw *customWriter) AddRequestStartMiddleware(mw RequestMiddleware) {
-	cw.reqStartMW = append(cw.reqStartMW, mw)
-}
-
-func (cw *customWriter) SetRequestHeader(header RequestHeaderManager) {
-	cw.reqHeader = header
-}
-
-func (cw *customWriter) GetRequestStartMiddleware() []RequestMiddleware {
-	return cw.reqStartMW
-}
-
-func (cw *customWriter) Read(p []byte) (int, error) {
-	tmp := make([]byte, len(p))
-	read, err := cw.reader.Read(tmp)
-	if read == 0 && err != nil {
-		return 0, err
-	}
-
-	tmp = tmp[:read]
-
-	idx := bytes.Index(tmp, DELIMITER)
-	if idx == -1 {
-		copy(p, tmp)
-		if err != nil {
-			return read, err
-		}
-		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
-		}
-	}
-
-	reqhf, err := NewRequestHeaderFactory(header)
-	if err != nil {
-		return 0, err
-	}
-
-	for _, m := range cw.reqStartMW {
-		if mwErr := m.HandleRequest(reqhf); mwErr != nil {
-			log.Printf("Error when applying request middleware: %v", mwErr)
-			return 0, mwErr
-		}
-	}
-
-	cw.reqHeader = reqhf
-	finalHeader := reqhf.Finalize()
-
-	combined := append(finalHeader, body...)
-
-	n := copy(p, combined)
-
-	return n, nil
-}
-
-func NewCustomWriter(writer io.Writer, reader io.Reader, remoteAddr net.Addr) HTTPWriter {
-	return &customWriter{
-		remoteAddr: remoteAddr,
-		writer:     writer,
-		reader:     reader,
-		buf:        make([]byte, 0, 4096),
-	}
-}
-
-var DELIMITER = []byte{0x0D, 0x0A, 0x0D, 0x0A}
-var requestLine = regexp.MustCompile(`^(GET|POST|PUT|DELETE|HEAD|OPTIONS|PATCH|TRACE|CONNECT) \S+ HTTP/\d\.\d$`)
-var responseLine = regexp.MustCompile(`^HTTP/\d\.\d \d{3} .+`)
-
-func isHTTPHeader(buf []byte) bool {
-	lines := bytes.Split(buf, []byte("\r\n"))
-
-	startLine := string(lines[0])
-	if !requestLine.MatchString(startLine) && !responseLine.MatchString(startLine) {
-		return false
-	}
-
-	for _, line := range lines[1:] {
-		if len(line) == 0 {
-			break
-		}
-		colonIdx := bytes.IndexByte(line, ':')
-		if colonIdx <= 0 {
-			return false
-		}
-	}
-	return true
-}
-
-func (cw *customWriter) Write(p []byte) (int, error) {
-	if cw.respHeader != nil && len(cw.buf) == 0 && len(p) >= 5 && string(p[0:5]) == "HTTP/" {
-		cw.respHeader = nil
-	}
-
-	if cw.respHeader != nil {
-		n, err := cw.writer.Write(p)
-		if err != nil {
-			return n, err
-		}
-		return n, nil
-	}
-
-	cw.buf = append(cw.buf, p...)
-
-	idx := bytes.Index(cw.buf, DELIMITER)
-	if idx == -1 {
-		return len(p), nil
-	}
-
-	header := cw.buf[:idx+len(DELIMITER)]
-	body := cw.buf[idx+len(DELIMITER):]
-
-	if !isHTTPHeader(header) {
-		_, err := cw.writer.Write(cw.buf)
-		cw.buf = nil
-		if err != nil {
-			return 0, err
-		}
-		return len(p), nil
-	}
-
-	resphf := NewResponseHeaderFactory(header)
-	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
-	}
-	if len(body) > 0 {
-		_, err = cw.writer.Write(body)
-		if err != nil {
-			return 0, err
-		}
-	}
-	cw.buf = nil
-	return len(p), nil
-}
-
-var redirectTLS = false
-
-type HTTPServer interface {
-	ListenAndServe() error
-	ListenAndServeTLS() error
-	handler(conn net.Conn)
-	handlerTLS(conn net.Conn)
-}
-type httpServer struct {
-	sessionRegistry session.Registry
-}
-
-func NewHTTPServer(sessionRegistry session.Registry) HTTPServer {
-	return &httpServer{sessionRegistry: sessionRegistry}
-}
-
-func (hs *httpServer) ListenAndServe() error {
-	httpPort := config.Getenv("HTTP_PORT", "8080")
-	listener, err := net.Listen("tcp", ":"+httpPort)
-	if err != nil {
-		return errors.New("Error listening: " + err.Error())
-	}
-	if config.Getenv("TLS_ENABLED", "false") == "true" && config.Getenv("TLS_REDIRECT", "false") == "true" {
-		redirectTLS = true
-	}
-	go func() {
-		for {
-			var conn net.Conn
-			conn, err = listener.Accept()
-			if err != nil {
-				if errors.Is(err, net.ErrClosed) {
-					return
-				}
-				log.Printf("Error accepting connection: %v", err)
-				continue
-			}
-
-			go hs.handler(conn)
-		}
-	}()
-	return nil
-}
-
-func (hs *httpServer) handler(conn net.Conn) {
-	defer func() {
-		err := conn.Close()
-		if err != nil && !errors.Is(err, net.ErrClosed) {
-			log.Printf("Error closing connection: %v", err)
-			return
-		}
-		return
-	}()
-
-	dstReader := bufio.NewReader(conn)
-	reqhf, err := NewRequestHeaderFactory(dstReader)
-	if err != nil {
-		log.Printf("Error creating request header: %v", err)
-		return
-	}
-
-	host := strings.Split(reqhf.Get("Host"), ".")
-	if len(host) < 1 {
-		_, err := conn.Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\n"))
-		if err != nil {
-			log.Println("Failed to write 400 Bad Request:", err)
-			return
-		}
-		return
-	}
-
-	slug := host[0]
-
-	if redirectTLS {
-		_, err = conn.Write([]byte("HTTP/1.1 301 Moved Permanently\r\n" +
-			fmt.Sprintf("Location: https://%s.%s/\r\n", slug, config.Getenv("DOMAIN", "localhost")) +
-			"Content-Length: 0\r\n" +
-			"Connection: close\r\n" +
-			"\r\n"))
-		if err != nil {
-			log.Println("Failed to write 301 Moved Permanently:", err)
-			return
-		}
-		return
-	}
-
-	if slug == "ping" {
-		_, err = conn.Write([]byte(
-			"HTTP/1.1 200 OK\r\n" +
-				"Content-Length: 0\r\n" +
-				"Connection: close\r\n" +
-				"Access-Control-Allow-Origin: *\r\n" +
-				"Access-Control-Allow-Methods: GET, HEAD, OPTIONS\r\n" +
-				"Access-Control-Allow-Headers: *\r\n" +
-				"\r\n",
-		))
-		if err != nil {
-			log.Println("Failed to write 200 OK:", err)
-			return
-		}
-		return
-	}
-
-	sshSession, err := hs.sessionRegistry.Get(types.SessionKey{
-		Id:   slug,
-		Type: types.HTTP,
-	})
-	if err != nil {
-		_, err = conn.Write([]byte("HTTP/1.1 301 Moved Permanently\r\n" +
-			fmt.Sprintf("Location: https://tunnl.live/tunnel-not-found?slug=%s\r\n", slug) +
-			"Content-Length: 0\r\n" +
-			"Connection: close\r\n" +
-			"\r\n"))
-		if err != nil {
-			log.Println("Failed to write 301 Moved Permanently:", err)
-			return
-		}
-		return
-	}
-	cw := NewCustomWriter(conn, dstReader, conn.RemoteAddr())
-	forwardRequest(cw, reqhf, sshSession)
-	return
-}
-
-func forwardRequest(cw HTTPWriter, initialRequest RequestHeaderManager, sshSession session.Session) {
-	payload := sshSession.Forwarder().CreateForwardedTCPIPPayload(cw.GetRemoteAddr())
-
-	type channelResult struct {
-		channel ssh.Channel
-		reqs    <-chan *ssh.Request
-		err     error
-	}
-	resultChan := make(chan channelResult, 1)
-
-	go func() {
-		channel, reqs, err := sshSession.Lifecycle().Connection().OpenChannel("forwarded-tcpip", payload)
-		resultChan <- channelResult{channel, reqs, err}
-	}()
-
-	var channel ssh.Channel
-	var reqs <-chan *ssh.Request
-
-	select {
-	case result := <-resultChan:
-		if result.err != nil {
-			log.Printf("Failed to open forwarded-tcpip channel: %v", result.err)
-			sshSession.Forwarder().WriteBadGatewayResponse(cw.GetWriter())
-			return
-		}
-		channel = result.channel
-		reqs = result.reqs
-	case <-time.After(5 * time.Second):
-		log.Printf("Timeout opening forwarded-tcpip channel")
-		sshSession.Forwarder().WriteBadGatewayResponse(cw.GetWriter())
-		return
-	}
-
-	go ssh.DiscardRequests(reqs)
-
-	fingerprintMiddleware := NewTunnelFingerprint()
-	forwardedForMiddleware := NewForwardedFor(cw.GetRemoteAddr())
-
-	cw.AddResponseMiddleware(fingerprintMiddleware)
-	cw.AddRequestStartMiddleware(forwardedForMiddleware)
-	cw.SetRequestHeader(initialRequest)
-
-	for _, m := range cw.GetRequestStartMiddleware() {
-		if err := m.HandleRequest(initialRequest); err != nil {
-			log.Printf("Error handling request: %v", err)
-			return
-		}
-	}
-
-	_, err := channel.Write(initialRequest.Finalize())
-	if err != nil {
-		log.Printf("Failed to forward request: %v", err)
-		return
-	}
-
-	sshSession.Forwarder().HandleConnection(cw, channel, cw.GetRemoteAddr())
-	return
-}

server/https.go

@@ -1,112 +0,0 @@
-package server
-
-import (
-	"bufio"
-	"crypto/tls"
-	"errors"
-	"fmt"
-	"log"
-	"net"
-	"strings"
-	"tunnel_pls/internal/config"
-	"tunnel_pls/types"
-)
-
-func (hs *httpServer) ListenAndServeTLS() error {
-	domain := config.Getenv("DOMAIN", "localhost")
-	httpsPort := config.Getenv("HTTPS_PORT", "8443")
-
-	tlsConfig, err := NewTLSConfig(domain)
-	if err != nil {
-		return fmt.Errorf("failed to initialize TLS config: %w", err)
-	}
-
-	ln, err := tls.Listen("tcp", ":"+httpsPort, tlsConfig)
-	if err != nil {
-		return err
-	}
-
-	go func() {
-		for {
-			var conn net.Conn
-			conn, err = ln.Accept()
-			if err != nil {
-				if errors.Is(err, net.ErrClosed) {
-					log.Println("https server closed")
-				}
-				log.Printf("Error accepting connection: %v", err)
-				continue
-			}
-
-			go hs.handlerTLS(conn)
-		}
-	}()
-	return nil
-}
-
-func (hs *httpServer) handlerTLS(conn net.Conn) {
-	defer func() {
-		err := conn.Close()
-		if err != nil {
-			log.Printf("Error closing connection: %v", err)
-			return
-		}
-		return
-	}()
-
-	dstReader := bufio.NewReader(conn)
-	reqhf, err := NewRequestHeaderFactory(dstReader)
-	if err != nil {
-		log.Printf("Error creating request header: %v", err)
-		return
-	}
-
-	host := strings.Split(reqhf.Get("Host"), ".")
-	if len(host) < 1 {
-		_, err = conn.Write([]byte("HTTP/1.1 400 Bad Request\r\n\r\n"))
-		if err != nil {
-			log.Println("Failed to write 400 Bad Request:", err)
-			return
-		}
-		return
-	}
-
-	slug := host[0]
-
-	if slug == "ping" {
-		_, err = conn.Write([]byte(
-			"HTTP/1.1 200 OK\r\n" +
-				"Content-Length: 0\r\n" +
-				"Connection: close\r\n" +
-				"Access-Control-Allow-Origin: *\r\n" +
-				"Access-Control-Allow-Methods: GET, HEAD, OPTIONS\r\n" +
-				"Access-Control-Allow-Headers: *\r\n" +
-				"\r\n",
-		))
-		if err != nil {
-			log.Println("Failed to write 200 OK:", err)
-			return
-		}
-		return
-	}
-
-	sshSession, err := hs.sessionRegistry.Get(types.SessionKey{
-		Id:   slug,
-		Type: types.HTTP,
-	})
-	if err != nil {
-		_, err = conn.Write([]byte("HTTP/1.1 301 Moved Permanently\r\n" +
-			fmt.Sprintf("Location: https://tunnl.live/tunnel-not-found?slug=%s\r\n", slug) +
-			"Content-Length: 0\r\n" +
-			"Connection: close\r\n" +
-			"\r\n"))
-		if err != nil {
-			log.Println("Failed to write 301 Moved Permanently:", err)
-			return
-		}
-		return
-	}
-	cw := NewCustomWriter(conn, dstReader, conn.RemoteAddr())
-	forwardRequest(cw, reqhf, sshSession)
-	return
-}

server/middleware.go

@@ -1,41 +0,0 @@
-package server
-
-import (
-	"net"
-)
-
-type RequestMiddleware interface {
-	HandleRequest(header RequestHeaderManager) error
-}
-
-type ResponseMiddleware interface {
-	HandleResponse(header ResponseHeaderManager, body []byte) error
-}
-
-type TunnelFingerprint struct{}
-
-func NewTunnelFingerprint() *TunnelFingerprint {
-	return &TunnelFingerprint{}
-}
-
-func (h *TunnelFingerprint) HandleResponse(header ResponseHeaderManager, body []byte) error {
-	header.Set("Server", "Tunnel Please")
-	return nil
-}
-
-type ForwardedFor struct {
-	addr net.Addr
-}
-
-func NewForwardedFor(addr net.Addr) *ForwardedFor {
-	return &ForwardedFor{addr: addr}
-}
-
-func (ff *ForwardedFor) HandleRequest(header RequestHeaderManager) error {
-	host, _, err := net.SplitHostPort(ff.addr.String())
-	if err != nil {
-		return err
-	}
-	header.Set("X-Forwarded-For", host)
-	return nil
-}

server/server.go

@@ -10,6 +10,7 @@ import (
 	"tunnel_pls/internal/config"
 	"tunnel_pls/internal/grpc/client"
 	"tunnel_pls/internal/port"
+	"tunnel_pls/internal/registry"
 	"tunnel_pls/session"
 
 	"golang.org/x/crypto/ssh"
@@ -20,38 +21,26 @@ type Server interface {
 	Close() error
 }
 type server struct {
-	listener        net.Listener
-	config          *ssh.ServerConfig
+	config          config.Config
+	sshPort         string
+	sshListener     net.Listener
+	sshConfig       *ssh.ServerConfig
 	grpcClient      client.Client
-	sessionRegistry session.Registry
-	portRegistry    port.Registry
+	sessionRegistry registry.Registry
+	portRegistry    port.Port
 }
 
-func New(sshConfig *ssh.ServerConfig, sessionRegistry session.Registry, grpcClient client.Client, portRegistry port.Registry) (Server, error) {
-	listener, err := net.Listen("tcp", fmt.Sprintf(":%s", config.Getenv("PORT", "2200")))
+func New(config config.Config, sshConfig *ssh.ServerConfig, sessionRegistry registry.Registry, grpcClient client.Client, portRegistry port.Port, sshPort string) (Server, error) {
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%s", sshPort))
 	if err != nil {
-		log.Fatalf("failed to listen on port 2200: %v", err)
 		return nil, err
 	}
 
-	HttpServer := NewHTTPServer(sessionRegistry)
-	err = HttpServer.ListenAndServe()
-	if err != nil {
-		log.Fatalf("failed to start http server: %v", err)
-		return nil, err
-	}
-
-	if config.Getenv("TLS_ENABLED", "false") == "true" {
-		err = HttpServer.ListenAndServeTLS()
-		if err != nil {
-			log.Fatalf("failed to start https server: %v", err)
-			return nil, err
-		}
-	}
-
 	return &server{
-		listener:        listener,
-		config:          sshConfig,
+		config:          config,
+		sshPort:         sshPort,
+		sshListener:     listener,
+		sshConfig:       sshConfig,
 		grpcClient:      grpcClient,
 		sessionRegistry: sessionRegistry,
 		portRegistry:    portRegistry,
@@ -59,9 +48,9 @@ func New(sshConfig *ssh.ServerConfig, sessionRegistry session.Registry, grpcClie
 }
 
 func (s *server) Start() {
-	log.Println("SSH server is starting on port 2200...")
+	log.Printf("SSH server is starting on port %s", s.sshPort)
 	for {
-		conn, err := s.listener.Accept()
+		conn, err := s.sshListener.Accept()
 		if err != nil {
 			if errors.Is(err, net.ErrClosed) {
 				log.Println("listener closed, stopping server")
@@ -76,11 +65,11 @@ func (s *server) Start() {
 }
 
 func (s *server) Close() error {
-	return s.listener.Close()
+	return s.sshListener.Close()
 }
 
 func (s *server) handleConnection(conn net.Conn) {
-	sshConn, chans, forwardingReqs, err := ssh.NewServerConn(conn, s.config)
+	sshConn, chans, forwardingReqs, err := ssh.NewServerConn(conn, s.sshConfig)
 	if err != nil {
 		log.Printf("failed to establish SSH connection: %v", err)
 		err = conn.Close()
@@ -106,7 +95,7 @@ func (s *server) handleConnection(conn net.Conn) {
 		cancel()
 	}
 	log.Println("SSH connection established:", sshConn.User())
-	sshSession := session.New(sshConn, forwardingReqs, chans, s.sessionRegistry, s.portRegistry, user)
+	sshSession := session.New(s.config, sshConn, forwardingReqs, chans, s.sessionRegistry, s.portRegistry, user)
 	err = sshSession.Start()
 	if err != nil {
 		log.Printf("SSH session ended with error: %v", err)

session/forwarder/forwarder.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"io"
 	"log"
 	"net"
@@ -17,37 +18,6 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
-var bufferPool = sync.Pool{
-	New: func() interface{} {
-		bufSize := config.GetBufferSize()
-		return make([]byte, bufSize)
-	},
-}
-
-func copyWithBuffer(dst io.Writer, src io.Reader) (written int64, err error) {
-	buf := bufferPool.Get().([]byte)
-	defer bufferPool.Put(buf)
-	return io.CopyBuffer(dst, src, buf)
-}
-
-type forwarder struct {
-	listener      net.Listener
-	tunnelType    types.TunnelType
-	forwardedPort uint16
-	slug          slug.Slug
-	conn          ssh.Conn
-}
-
-func New(slug slug.Slug, conn ssh.Conn) Forwarder {
-	return &forwarder{
-		listener:      nil,
-		tunnelType:    types.UNKNOWN,
-		forwardedPort: 0,
-		slug:          slug,
-		conn:          conn,
-	}
-}
-
 type Forwarder interface {
 	SetType(tunnelType types.TunnelType)
 	SetForwardedPort(port uint16)
@@ -55,110 +25,124 @@ type Forwarder interface {
 	Listener() net.Listener
 	TunnelType() types.TunnelType
 	ForwardedPort() uint16
-	HandleConnection(dst io.ReadWriter, src ssh.Channel, remoteAddr net.Addr)
+	HandleConnection(dst io.ReadWriter, src ssh.Channel)
 	CreateForwardedTCPIPPayload(origin net.Addr) []byte
+	OpenForwardedChannel(payload []byte) (ssh.Channel, <-chan *ssh.Request, error)
 	WriteBadGatewayResponse(dst io.Writer)
-	AcceptTCPConnections()
 	Close() error
 }
+type forwarder struct {
+	listener      net.Listener
+	tunnelType    types.TunnelType
+	forwardedPort uint16
+	slug          slug.Slug
+	conn          ssh.Conn
+	bufferPool    sync.Pool
+}
 
-func (f *forwarder) AcceptTCPConnections() {
-	for {
-		conn, err := f.Listener().Accept()
-		if err != nil {
-			if errors.Is(err, net.ErrClosed) {
-				return
-			}
-			log.Printf("Error accepting connection: %v", err)
-			continue
-		}
-
-		if err = conn.SetDeadline(time.Now().Add(5 * time.Second)); err != nil {
-			log.Printf("Failed to set connection deadline: %v", err)
-			if closeErr := conn.Close(); closeErr != nil {
-				log.Printf("Failed to close connection: %v", closeErr)
-			}
-			continue
-		}
-
-		payload := f.CreateForwardedTCPIPPayload(conn.RemoteAddr())
-
-		type channelResult struct {
-			channel ssh.Channel
-			reqs    <-chan *ssh.Request
-			err     error
-		}
-		resultChan := make(chan channelResult, 1)
-
-		go func() {
-			channel, reqs, err := f.conn.OpenChannel("forwarded-tcpip", payload)
-			resultChan <- channelResult{channel, reqs, err}
-		}()
-
-		select {
-		case result := <-resultChan:
-			if result.err != nil {
-				log.Printf("Failed to open forwarded-tcpip channel: %v", result.err)
-				if closeErr := conn.Close(); closeErr != nil {
-					log.Printf("Failed to close connection: %v", closeErr)
-				}
-				continue
-			}
-
-			if err = conn.SetDeadline(time.Time{}); err != nil {
-				log.Printf("Failed to clear connection deadline: %v", err)
-			}
-
-			go ssh.DiscardRequests(result.reqs)
-			go f.HandleConnection(conn, result.channel, conn.RemoteAddr())
-
-		case <-time.After(5 * time.Second):
-			log.Printf("Timeout opening forwarded-tcpip channel")
-			if closeErr := conn.Close(); closeErr != nil {
-				log.Printf("Failed to close connection: %v", closeErr)
-			}
-		}
+func New(config config.Config, slug slug.Slug, conn ssh.Conn) Forwarder {
+	return &forwarder{
+		listener:      nil,
+		tunnelType:    types.TunnelTypeUNKNOWN,
+		forwardedPort: 0,
+		slug:          slug,
+		conn:          conn,
+		bufferPool: sync.Pool{
+			New: func() interface{} {
+				bufSize := config.BufferSize()
+				return make([]byte, bufSize)
+			},
+		},
 	}
 }
 
-func (f *forwarder) HandleConnection(dst io.ReadWriter, src ssh.Channel, remoteAddr net.Addr) {
+func (f *forwarder) copyWithBuffer(dst io.Writer, src io.Reader) (written int64, err error) {
+	buf := f.bufferPool.Get().([]byte)
+	defer f.bufferPool.Put(buf)
+	return io.CopyBuffer(dst, src, buf)
+}
+
+func (f *forwarder) OpenForwardedChannel(payload []byte) (ssh.Channel, <-chan *ssh.Request, error) {
+	type channelResult struct {
+		channel ssh.Channel
+		reqs    <-chan *ssh.Request
+		err     error
+	}
+	resultChan := make(chan channelResult, 1)
+
+	go func() {
+		channel, reqs, err := f.conn.OpenChannel("forwarded-tcpip", payload)
+		select {
+		case resultChan <- channelResult{channel, reqs, err}:
+		default:
+			if channel != nil {
+				err = channel.Close()
+				if err != nil {
+					log.Printf("Failed to close unused channel: %v", err)
+					return
+				}
+				go ssh.DiscardRequests(reqs)
+			}
+		}
+	}()
+
+	select {
+	case result := <-resultChan:
+		return result.channel, result.reqs, result.err
+	case <-time.After(5 * time.Second):
+		return nil, nil, errors.New("timeout opening forwarded-tcpip channel")
+	}
+}
+
+func closeWriter(w io.Writer) error {
+	if cw, ok := w.(interface{ CloseWrite() error }); ok {
+		return cw.CloseWrite()
+	}
+	if closer, ok := w.(io.Closer); ok {
+		return closer.Close()
+	}
+	return nil
+}
+
+func (f *forwarder) copyAndClose(dst io.Writer, src io.Reader, direction string) error {
+	var errs []error
+	_, err := f.copyWithBuffer(dst, src)
+	if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
+		errs = append(errs, fmt.Errorf("copy error (%s): %w", direction, err))
+	}
+
+	if err = closeWriter(dst); err != nil && !errors.Is(err, io.EOF) {
+		errs = append(errs, fmt.Errorf("close stream error (%s): %w", direction, err))
+	}
+	return errors.Join(errs...)
+}
+
+func (f *forwarder) HandleConnection(dst io.ReadWriter, src ssh.Channel) {
 	defer func() {
 		_, err := io.Copy(io.Discard, src)
 		if err != nil {
 			log.Printf("Failed to discard connection: %v", err)
 		}
-
-		err = src.Close()
-		if err != nil && !errors.Is(err, io.EOF) {
-			log.Printf("Error closing source channel: %v", err)
-		}
-
-		if closer, ok := dst.(io.Closer); ok {
-			err = closer.Close()
-			if err != nil && !errors.Is(err, io.EOF) {
-				log.Printf("Error closing destination connection: %v", err)
-			}
-		}
 	}()
 
-	log.Printf("Handling new forwarded connection from %s", remoteAddr)
-
 	var wg sync.WaitGroup
 	wg.Add(2)
 
 	go func() {
 		defer wg.Done()
-		_, err := copyWithBuffer(dst, src)
-		if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
-			log.Printf("Error copying src→dst: %v", err)
+		err := f.copyAndClose(dst, src, "src to dst")
+		if err != nil {
+			log.Println("Error during copy: ", err)
+			return
 		}
 	}()
 
 	go func() {
 		defer wg.Done()
-		_, err := copyWithBuffer(src, dst)
-		if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
-			log.Printf("Error copying dst→src: %v", err)
+		err := f.copyAndClose(src, dst, "dst to src")
+		if err != nil {
+			log.Println("Error during copy: ", err)
+			return
 		}
 	}()
 

session/interaction/interaction.go

@@ -18,9 +18,9 @@ import (
 )
 
 type Interaction interface {
-	Mode() types.Mode
+	Mode() types.InteractiveMode
 	SetChannel(channel ssh.Channel)
-	SetMode(m types.Mode)
+	SetMode(m types.InteractiveMode)
 	SetWH(w, h int)
 	Start()
 	Redraw()
@@ -39,6 +39,7 @@ type Forwarder interface {
 
 type CloseFunc func() error
 type interaction struct {
+	config          config.Config
 	channel         ssh.Channel
 	slug            slug.Slug
 	forwarder       Forwarder
@@ -48,14 +49,14 @@ type interaction struct {
 	program         *tea.Program
 	ctx             context.Context
 	cancel          context.CancelFunc
-	mode            types.Mode
+	mode            types.InteractiveMode
 }
 
-func (i *interaction) SetMode(m types.Mode) {
+func (i *interaction) SetMode(m types.InteractiveMode) {
 	i.mode = m
 }
 
-func (i *interaction) Mode() types.Mode {
+func (i *interaction) Mode() types.InteractiveMode {
 	return i.mode
 }
 
@@ -75,9 +76,10 @@ func (i *interaction) SetWH(w, h int) {
 	}
 }
 
-func New(slug slug.Slug, forwarder Forwarder, sessionRegistry SessionRegistry, user string, closeFunc CloseFunc) Interaction {
+func New(config config.Config, slug slug.Slug, forwarder Forwarder, sessionRegistry SessionRegistry, user string, closeFunc CloseFunc) Interaction {
 	ctx, cancel := context.WithCancel(context.Background())
 	return &interaction{
+		config:          config,
 		channel:         nil,
 		slug:            slug,
 		forwarder:       forwarder,
@@ -174,14 +176,13 @@ func (m *model) View() string {
 }
 
 func (i *interaction) Start() {
-	if i.mode == types.HEADLESS {
+	if i.mode == types.InteractiveModeHEADLESS {
 		return
 	}
 	lipgloss.SetColorProfile(termenv.TrueColor)
 
-	domain := config.Getenv("DOMAIN", "localhost")
 	protocol := "http"
-	if config.Getenv("TLS_ENABLED", "false") == "true" {
+	if i.config.TLSEnabled() {
 		protocol = "https"
 	}
 
@@ -209,7 +210,7 @@ func (i *interaction) Start() {
 	ti.Width = 50
 
 	m := &model{
-		domain:      domain,
+		domain:      i.config.Domain(),
 		protocol:    protocol,
 		tunnelType:  tunnelType,
 		port:        port,

session/interaction/model.go

@@ -41,7 +41,7 @@ type model struct {
 }
 
 func (m *model) getTunnelURL() string {
-	if m.tunnelType == types.HTTP {
+	if m.tunnelType == types.TunnelTypeHTTP {
 		return buildURL(m.protocol, m.interaction.slug.String(), m.domain)
 	}
 	return fmt.Sprintf("tcp://%s:%d", m.domain, m.port)

session/interaction/slug.go

@@ -15,7 +15,7 @@ import (
 func (m *model) slugUpdate(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	var cmd tea.Cmd
 
-	if m.tunnelType != types.HTTP {
+	if m.tunnelType != types.TunnelTypeHTTP {
 		m.editingSlug = false
 		m.slugError = ""
 		return m, tea.Batch(tea.ClearScreen, textinput.Blink)
@@ -30,10 +30,10 @@ func (m *model) slugUpdate(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		inputValue := m.slugInput.Value()
 		if err := m.interaction.sessionRegistry.Update(m.interaction.user, types.SessionKey{
 			Id:   m.interaction.slug.String(),
-			Type: types.HTTP,
+			Type: types.TunnelTypeHTTP,
 		}, types.SessionKey{
 			Id:   inputValue,
-			Type: types.HTTP,
+			Type: types.TunnelTypeHTTP,
 		}); err != nil {
 			m.slugError = err.Error()
 			return m, nil
@@ -130,7 +130,7 @@ func (m *model) slugView() string {
 	b.WriteString(titleStyle.Render(title))
 	b.WriteString("\n\n")
 
-	if m.tunnelType != types.HTTP {
+	if m.tunnelType != types.TunnelTypeHTTP {
 		warningBoxWidth := getResponsiveWidth(m.width, 10, 30, 60)
 		warningBoxStyle := lipgloss.NewStyle().
 			Foreground(lipgloss.Color("#FFA500")).

session/lifecycle/lifecycle.go

@@ -2,8 +2,6 @@ package lifecycle
 
 import (
 	"errors"
-	"io"
-	"net"
 	"time"
 
 	portUtil "tunnel_pls/internal/port"
@@ -24,20 +22,20 @@ type SessionRegistry interface {
 }
 
 type lifecycle struct {
-	status          types.Status
+	status          types.SessionStatus
 	conn            ssh.Conn
 	channel         ssh.Channel
 	forwarder       Forwarder
 	slug            slug.Slug
 	startedAt       time.Time
 	sessionRegistry SessionRegistry
-	portRegistry    portUtil.Registry
+	portRegistry    portUtil.Port
 	user            string
 }
 
-func New(conn ssh.Conn, forwarder Forwarder, slugManager slug.Slug, port portUtil.Registry, sessionRegistry SessionRegistry, user string) Lifecycle {
+func New(conn ssh.Conn, forwarder Forwarder, slugManager slug.Slug, port portUtil.Port, sessionRegistry SessionRegistry, user string) Lifecycle {
 	return &lifecycle{
-		status:          types.INITIALIZING,
+		status:          types.SessionStatusINITIALIZING,
 		conn:            conn,
 		channel:         nil,
 		forwarder:       forwarder,
@@ -51,16 +49,16 @@ func New(conn ssh.Conn, forwarder Forwarder, slugManager slug.Slug, port portUti
 
 type Lifecycle interface {
 	Connection() ssh.Conn
-	PortRegistry() portUtil.Registry
+	PortRegistry() portUtil.Port
 	User() string
 	SetChannel(channel ssh.Channel)
-	SetStatus(status types.Status)
+	SetStatus(status types.SessionStatus)
 	IsActive() bool
 	StartedAt() time.Time
 	Close() error
 }
 
-func (l *lifecycle) PortRegistry() portUtil.Registry {
+func (l *lifecycle) PortRegistry() portUtil.Port {
 	return l.portRegistry
 }
 
@@ -74,35 +72,30 @@ func (l *lifecycle) SetChannel(channel ssh.Channel) {
 func (l *lifecycle) Connection() ssh.Conn {
 	return l.conn
 }
-func (l *lifecycle) SetStatus(status types.Status) {
+func (l *lifecycle) SetStatus(status types.SessionStatus) {
 	l.status = status
-	if status == types.RUNNING && l.startedAt.IsZero() {
+	if status == types.SessionStatusRUNNING && l.startedAt.IsZero() {
 		l.startedAt = time.Now()
 	}
 }
 
+func closeIfNotNil(c interface{ Close() error }) error {
+	if c != nil {
+		return c.Close()
+	}
+	return nil
+}
+
 func (l *lifecycle) Close() error {
-	var firstErr error
+	var errs []error
 	tunnelType := l.forwarder.TunnelType()
 
-	if err := l.forwarder.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
-		firstErr = err
+	if err := closeIfNotNil(l.channel); err != nil {
+		errs = append(errs, err)
 	}
 
-	if l.channel != nil {
-		if err := l.channel.Close(); err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
-			if firstErr == nil {
-				firstErr = err
-			}
-		}
-	}
-
-	if l.conn != nil {
-		if err := l.conn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
-			if firstErr == nil {
-				firstErr = err
-			}
-		}
+	if err := closeIfNotNil(l.conn); err != nil {
+		errs = append(errs, err)
 	}
 
 	clientSlug := l.slug.String()
@@ -112,17 +105,20 @@ func (l *lifecycle) Close() error {
 	}
 	l.sessionRegistry.Remove(key)
 
-	if tunnelType == types.TCP {
-		if err := l.PortRegistry().SetPortStatus(l.forwarder.ForwardedPort(), false); err != nil && firstErr == nil {
-			firstErr = err
+	if tunnelType == types.TunnelTypeTCP {
+		if err := l.PortRegistry().SetStatus(l.forwarder.ForwardedPort(), false); err != nil {
+			errs = append(errs, err)
+		}
+		if err := l.forwarder.Close(); err != nil {
+			errs = append(errs, err)
 		}
 	}
 
-	return firstErr
+	return errors.Join(errs...)
 }
 
 func (l *lifecycle) IsActive() bool {
-	return l.status == types.RUNNING
+	return l.status == types.SessionStatusRUNNING
 }
 
 func (l *lifecycle) StartedAt() time.Time {

session/session.go

@@ -12,6 +12,8 @@ import (
 	"tunnel_pls/internal/config"
 	portUtil "tunnel_pls/internal/port"
 	"tunnel_pls/internal/random"
+	"tunnel_pls/internal/registry"
+	"tunnel_pls/internal/transport"
 	"tunnel_pls/session/forwarder"
 	"tunnel_pls/session/interaction"
 	"tunnel_pls/session/lifecycle"
@@ -21,46 +23,40 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
-type Detail struct {
-	ForwardingType string    `json:"forwarding_type,omitempty"`
-	Slug           string    `json:"slug,omitempty"`
-	UserID         string    `json:"user_id,omitempty"`
-	Active         bool      `json:"active,omitempty"`
-	StartedAt      time.Time `json:"started_at,omitempty"`
-}
-
 type Session interface {
-	HandleGlobalRequest(ch <-chan *ssh.Request)
-	HandleTCPIPForward(req *ssh.Request)
-	HandleHTTPForward(req *ssh.Request, port uint16)
-	HandleTCPForward(req *ssh.Request, addr string, port uint16)
+	HandleGlobalRequest(ch <-chan *ssh.Request) error
+	HandleTCPIPForward(req *ssh.Request) error
+	HandleHTTPForward(req *ssh.Request, port uint16) error
+	HandleTCPForward(req *ssh.Request, addr string, port uint16) error
 	Lifecycle() lifecycle.Lifecycle
 	Interaction() interaction.Interaction
 	Forwarder() forwarder.Forwarder
 	Slug() slug.Slug
-	Detail() *Detail
+	Detail() *types.Detail
 	Start() error
 }
 
 type session struct {
+	config      config.Config
 	initialReq  <-chan *ssh.Request
 	sshChan     <-chan ssh.NewChannel
 	lifecycle   lifecycle.Lifecycle
 	interaction interaction.Interaction
 	forwarder   forwarder.Forwarder
 	slug        slug.Slug
-	registry    Registry
+	registry    registry.Registry
 }
 
 var blockedReservedPorts = []uint16{1080, 1433, 1521, 1900, 2049, 3306, 3389, 5432, 5900, 6379, 8080, 8443, 9000, 9200, 27017}
 
-func New(conn *ssh.ServerConn, initialReq <-chan *ssh.Request, sshChan <-chan ssh.NewChannel, sessionRegistry Registry, portRegistry portUtil.Registry, user string) Session {
+func New(config config.Config, conn *ssh.ServerConn, initialReq <-chan *ssh.Request, sshChan <-chan ssh.NewChannel, sessionRegistry registry.Registry, portRegistry portUtil.Port, user string) Session {
 	slugManager := slug.New()
-	forwarderManager := forwarder.New(slugManager, conn)
+	forwarderManager := forwarder.New(config, slugManager, conn)
 	lifecycleManager := lifecycle.New(conn, forwarderManager, slugManager, portRegistry, sessionRegistry, user)
-	interactionManager := interaction.New(slugManager, forwarderManager, sessionRegistry, user, lifecycleManager.Close)
+	interactionManager := interaction.New(config, slugManager, forwarderManager, sessionRegistry, user, lifecycleManager.Close)
 
 	return &session{
+		config:      config,
 		initialReq:  initialReq,
 		sshChan:     sshChan,
 		lifecycle:   lifecycleManager,
@@ -87,16 +83,17 @@ func (s *session) Slug() slug.Slug {
 	return s.slug
 }
 
-func (s *session) Detail() *Detail {
-	var tunnelType string
-	if s.forwarder.TunnelType() == types.HTTP {
-		tunnelType = "HTTP"
-	} else if s.forwarder.TunnelType() == types.TCP {
-		tunnelType = "TCP"
-	} else {
-		tunnelType = "UNKNOWN"
+func (s *session) Detail() *types.Detail {
+	tunnelTypeMap := map[types.TunnelType]string{
+		types.TunnelTypeHTTP: "TunnelTypeHTTP",
+		types.TunnelTypeTCP:  "TunnelTypeTCP",
 	}
-	return &Detail{
+	tunnelType, ok := tunnelTypeMap[s.forwarder.TunnelType()]
+	if !ok {
+		tunnelType = "TunnelTypeUNKNOWN"
+	}
+
+	return &types.Detail{
 		ForwardingType: tunnelType,
 		Slug:           s.slug.String(),
 		UserID:         s.lifecycle.User(),
@@ -106,55 +103,80 @@ func (s *session) Detail() *Detail {
 }
 
 func (s *session) Start() error {
-	var channel ssh.NewChannel
-	var ok bool
-	select {
-	case channel, ok = <-s.sshChan:
-		if !ok {
-			log.Println("Forwarding request channel closed")
-			return nil
-		}
-		ch, reqs, err := channel.Accept()
-		if err != nil {
-			log.Printf("failed to accept channel: %v", err)
-			return err
-		}
-		go s.HandleGlobalRequest(reqs)
-
-		s.lifecycle.SetChannel(ch)
-		s.interaction.SetChannel(ch)
-		s.interaction.SetMode(types.INTERACTIVE)
-	case <-time.After(500 * time.Millisecond):
-		s.interaction.SetMode(types.HEADLESS)
+	if err := s.setupSessionMode(); err != nil {
+		return err
 	}
 
 	tcpipReq := s.waitForTCPIPForward()
 	if tcpipReq == nil {
-		err := s.interaction.Send(fmt.Sprintf("PortRegistry forwarding request not received. Ensure you ran the correct command with -R flag. Example: ssh %s -p %s -R 80:localhost:3000", config.Getenv("DOMAIN", "localhost"), config.Getenv("PORT", "2200")))
-		if err != nil {
-			return err
-		}
-		if err = s.lifecycle.Close(); err != nil {
-			log.Printf("failed to close session: %v", err)
-		}
-		return fmt.Errorf("no forwarding Request")
+		return s.handleMissingForwardRequest()
 	}
 
-	if (s.interaction.Mode() == types.HEADLESS && config.Getenv("MODE", "standalone") == "standalone") && s.lifecycle.User() == "UNAUTHORIZED" {
-		if err := tcpipReq.Reply(false, nil); err != nil {
-			log.Printf("cannot reply to tcpip req: %s\n", err)
-			return err
-		}
-		if err := s.lifecycle.Close(); err != nil {
-			log.Printf("failed to close session: %v", err)
-			return err
-		}
-		return nil
+	if s.shouldRejectUnauthorized() {
+		return s.denyForwardingRequest(tcpipReq, nil, nil, fmt.Sprintf("headless forwarding only allowed on node mode"))
 	}
 
-	s.HandleTCPIPForward(tcpipReq)
+	if err := s.HandleTCPIPForward(tcpipReq); err != nil {
+		return err
+	}
 	s.interaction.Start()
 
+	return s.waitForSessionEnd()
+}
+
+func (s *session) setupSessionMode() error {
+	select {
+	case channel, ok := <-s.sshChan:
+		if !ok {
+			log.Println("Forwarding request channel closed")
+			return nil
+		}
+		return s.setupInteractiveMode(channel)
+	case <-time.After(500 * time.Millisecond):
+		s.interaction.SetMode(types.InteractiveModeHEADLESS)
+		return nil
+	}
+}
+
+func (s *session) setupInteractiveMode(channel ssh.NewChannel) error {
+	ch, reqs, err := channel.Accept()
+	if err != nil {
+		log.Printf("failed to accept channel: %v", err)
+		return err
+	}
+
+	go func() {
+		err = s.HandleGlobalRequest(reqs)
+		if err != nil {
+			log.Printf("global request handler error: %v", err)
+		}
+	}()
+
+	s.lifecycle.SetChannel(ch)
+	s.interaction.SetChannel(ch)
+	s.interaction.SetMode(types.InteractiveModeINTERACTIVE)
+
+	return nil
+}
+
+func (s *session) handleMissingForwardRequest() error {
+	err := s.interaction.Send(fmt.Sprintf("PortRegistry forwarding request not received. Ensure you ran the correct command with -R flag. Example: ssh %s -p %s -R 80:localhost:3000", s.config.Domain(), s.config.SSHPort()))
+	if err != nil {
+		return err
+	}
+	if err = s.lifecycle.Close(); err != nil {
+		log.Printf("failed to close session: %v", err)
+	}
+	return fmt.Errorf("no forwarding Request")
+}
+
+func (s *session) shouldRejectUnauthorized() bool {
+	return s.interaction.Mode() == types.InteractiveModeHEADLESS &&
+		s.config.Mode() == types.ServerModeSTANDALONE &&
+		s.lifecycle.User() == "UNAUTHORIZED"
+}
+
+func (s *session) waitForSessionEnd() error {
 	if err := s.lifecycle.Connection().Wait(); err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
 		log.Printf("ssh connection closed with error: %v", err)
 	}
@@ -187,220 +209,191 @@ func (s *session) waitForTCPIPForward() *ssh.Request {
 	}
 }
 
-func (s *session) HandleGlobalRequest(GlobalRequest <-chan *ssh.Request) {
+func (s *session) handleWindowChange(req *ssh.Request) error {
+	p := req.Payload
+	if len(p) < 16 {
+		log.Println("invalid window-change payload")
+		return req.Reply(false, nil)
+	}
+
+	cols := binary.BigEndian.Uint32(p[0:4])
+	rows := binary.BigEndian.Uint32(p[4:8])
+
+	s.interaction.SetWH(int(cols), int(rows))
+	return req.Reply(true, nil)
+}
+
+func (s *session) HandleGlobalRequest(GlobalRequest <-chan *ssh.Request) error {
 	for req := range GlobalRequest {
 		switch req.Type {
 		case "shell", "pty-req":
 			err := req.Reply(true, nil)
 			if err != nil {
-				log.Println("Failed to reply to request:", err)
-				return
+				return err
 			}
 		case "window-change":
-			p := req.Payload
-			if len(p) < 16 {
-				log.Println("invalid window-change payload")
-				err := req.Reply(false, nil)
-				if err != nil {
-					log.Println("Failed to reply to request:", err)
-					return
-				}
-				return
-			}
-			cols := binary.BigEndian.Uint32(p[0:4])
-			rows := binary.BigEndian.Uint32(p[4:8])
-
-			s.interaction.SetWH(int(cols), int(rows))
-
-			err := req.Reply(true, nil)
-			if err != nil {
-				log.Println("Failed to reply to request:", err)
-				return
+			if err := s.handleWindowChange(req); err != nil {
+				return err
 			}
 		default:
 			log.Println("Unknown request type:", req.Type)
 			err := req.Reply(false, nil)
 			if err != nil {
-				log.Println("Failed to reply to request:", err)
-				return
+				return err
 			}
 		}
 	}
+	return nil
 }
 
-func (s *session) HandleTCPIPForward(req *ssh.Request) {
-	log.Println("PortRegistry forwarding request detected")
-
-	fail := func(msg string) {
-		log.Println(msg)
-		if err := req.Reply(false, nil); err != nil {
-			log.Println("Failed to reply to request:", err)
-			return
-		}
-		if err := s.lifecycle.Close(); err != nil {
-			log.Printf("failed to close session: %v", err)
-		}
-	}
-
-	reader := bytes.NewReader(req.Payload)
-
-	addr, err := readSSHString(reader)
+func (s *session) parseForwardPayload(payloadReader io.Reader) (address string, port uint16, err error) {
+	address, err = readSSHString(payloadReader)
 	if err != nil {
-		fail(fmt.Sprintf("Failed to read address from payload: %v", err))
-		return
+		return "", 0, err
 	}
 
 	var rawPortToBind uint32
-	if err = binary.Read(reader, binary.BigEndian, &rawPortToBind); err != nil {
-		fail(fmt.Sprintf("Failed to read port from payload: %v", err))
-		return
+	if err = binary.Read(payloadReader, binary.BigEndian, &rawPortToBind); err != nil {
+		return "", 0, err
 	}
 
 	if rawPortToBind > 65535 {
-		fail(fmt.Sprintf("PortRegistry %d is larger than allowed port of 65535", rawPortToBind))
-		return
+		return "", 0, fmt.Errorf("port is larger than allowed port of 65535")
 	}
 
-	portToBind := uint16(rawPortToBind)
-	if isBlockedPort(portToBind) {
-		fail(fmt.Sprintf("PortRegistry %d is blocked or restricted", portToBind))
-		return
+	port = uint16(rawPortToBind)
+	if isBlockedPort(port) {
+		return "", 0, fmt.Errorf("port is block")
 	}
 
-	switch portToBind {
+	if port == 0 {
+		unassigned, ok := s.lifecycle.PortRegistry().Unassigned()
+		if !ok {
+			return "", 0, fmt.Errorf("no available port")
+		}
+		return address, unassigned, err
+	}
+
+	return address, port, err
+}
+
+func (s *session) denyForwardingRequest(req *ssh.Request, key *types.SessionKey, listener io.Closer, msg string) error {
+	var errs []error
+	if key != nil {
+		s.registry.Remove(*key)
+	}
+	if listener != nil {
+		if err := listener.Close(); err != nil {
+			errs = append(errs, fmt.Errorf("close listener: %w", err))
+		}
+	}
+	if err := req.Reply(false, nil); err != nil {
+		errs = append(errs, fmt.Errorf("reply request: %w", err))
+	}
+	if err := s.lifecycle.Close(); err != nil {
+		errs = append(errs, fmt.Errorf("close session: %w", err))
+	}
+	errs = append(errs, fmt.Errorf("deny forwarding request: %s", msg))
+	return errors.Join(errs...)
+}
+
+func (s *session) approveForwardingRequest(req *ssh.Request, port uint16) (err error) {
+	buf := new(bytes.Buffer)
+	err = binary.Write(buf, binary.BigEndian, uint32(port))
+	if err != nil {
+		return err
+	}
+
+	err = req.Reply(true, buf.Bytes())
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func (s *session) finalizeForwarding(req *ssh.Request, portToBind uint16, listener net.Listener, tunnelType types.TunnelType, slug string) error {
+	err := s.approveForwardingRequest(req, portToBind)
+	if err != nil {
+		return err
+	}
+
+	s.forwarder.SetType(tunnelType)
+	s.forwarder.SetForwardedPort(portToBind)
+	s.slug.Set(slug)
+	s.lifecycle.SetStatus(types.SessionStatusRUNNING)
+
+	if listener != nil {
+		s.forwarder.SetListener(listener)
+	}
+
+	return nil
+}
+
+func (s *session) HandleTCPIPForward(req *ssh.Request) error {
+	reader := bytes.NewReader(req.Payload)
+
+	address, port, err := s.parseForwardPayload(reader)
+	if err != nil {
+		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("cannot parse forwarded payload: %s", err.Error()))
+	}
+
+	switch port {
 	case 80, 443:
-		s.HandleHTTPForward(req, portToBind)
+		return s.HandleHTTPForward(req, port)
 	default:
-		s.HandleTCPForward(req, addr, portToBind)
+		return s.HandleTCPForward(req, address, port)
 	}
 }
 
-func (s *session) HandleHTTPForward(req *ssh.Request, portToBind uint16) {
-	fail := func(msg string, key *types.SessionKey) {
-		log.Println(msg)
-		if key != nil {
-			s.registry.Remove(*key)
-		}
-		if err := req.Reply(false, nil); err != nil {
-			log.Println("Failed to reply to request:", err)
-		}
-	}
-
+func (s *session) HandleHTTPForward(req *ssh.Request, portToBind uint16) error {
 	randomString, err := random.GenerateRandomString(20)
 	if err != nil {
-		fail(fmt.Sprintf("Failed to create slug: %s", err), nil)
-		return
+		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("Failed to create slug: %s", err))
 	}
-	key := types.SessionKey{Id: randomString, Type: types.HTTP}
+	key := types.SessionKey{Id: randomString, Type: types.TunnelTypeHTTP}
 	if !s.registry.Register(key, s) {
-		fail(fmt.Sprintf("Failed to register client with slug: %s", randomString), nil)
-		return
+		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("Failed to register client with slug: %s", randomString))
 	}
 
-	buf := new(bytes.Buffer)
-	err = binary.Write(buf, binary.BigEndian, uint32(portToBind))
+	err = s.finalizeForwarding(req, portToBind, nil, types.TunnelTypeHTTP, key.Id)
 	if err != nil {
-		fail(fmt.Sprintf("Failed to write port to buffer: %v", err), &key)
-		return
+		return s.denyForwardingRequest(req, &key, nil, fmt.Sprintf("Failed to finalize forwarding: %s", err))
 	}
-	log.Printf("HTTP forwarding approved on port: %d", portToBind)
-
-	err = req.Reply(true, buf.Bytes())
-	if err != nil {
-		fail(fmt.Sprintf("Failed to reply to request: %v", err), &key)
-		return
-	}
-
-	s.forwarder.SetType(types.HTTP)
-	s.forwarder.SetForwardedPort(portToBind)
-	s.slug.Set(randomString)
-	s.lifecycle.SetStatus(types.RUNNING)
+	return nil
 }
 
-func (s *session) HandleTCPForward(req *ssh.Request, addr string, portToBind uint16) {
-	fail := func(msg string) {
-		log.Println(msg)
-		if err := req.Reply(false, nil); err != nil {
-			log.Println("Failed to reply to request:", err)
-			return
-		}
-		if err := s.lifecycle.Close(); err != nil {
-			log.Printf("failed to close session: %v", err)
-		}
+func (s *session) HandleTCPForward(req *ssh.Request, addr string, portToBind uint16) error {
+	if claimed := s.lifecycle.PortRegistry().Claim(portToBind); !claimed {
+		return s.denyForwardingRequest(req, nil, nil, fmt.Sprintf("PortRegistry %d is already in use or restricted", portToBind))
 	}
 
-	cleanup := func(msg string, port uint16, listener net.Listener, key *types.SessionKey) {
-		log.Println(msg)
-		if key != nil {
-			s.registry.Remove(*key)
-		}
-		if port != 0 {
-			if setErr := s.lifecycle.PortRegistry().SetPortStatus(port, false); setErr != nil {
-				log.Printf("Failed to reset port status: %v", setErr)
-			}
-		}
-		if listener != nil {
-			if closeErr := listener.Close(); closeErr != nil {
-				log.Printf("Failed to close listener: %v", closeErr)
-			}
-		}
-		if err := req.Reply(false, nil); err != nil {
-			log.Println("Failed to reply to request:", err)
-		}
-		_ = s.lifecycle.Close()
-	}
-
-	if portToBind == 0 {
-		unassigned, ok := s.lifecycle.PortRegistry().GetUnassignedPort()
-		if !ok {
-			fail("No available port")
-			return
-		}
-		portToBind = unassigned
-	}
-
-	if claimed := s.lifecycle.PortRegistry().ClaimPort(portToBind); !claimed {
-		fail(fmt.Sprintf("PortRegistry %d is already in use or restricted", portToBind))
-		return
-	}
-
-	log.Printf("Requested forwarding on %s:%d", addr, portToBind)
-	listener, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", portToBind))
+	tcpServer := transport.NewTCPServer(portToBind, s.forwarder)
+	listener, err := tcpServer.Listen()
 	if err != nil {
-		cleanup(fmt.Sprintf("PortRegistry %d is already in use or restricted", portToBind), portToBind, nil, nil)
-		return
+		return s.denyForwardingRequest(req, nil, listener, fmt.Sprintf("PortRegistry %d is already in use or restricted", portToBind))
 	}
 
-	key := types.SessionKey{Id: fmt.Sprintf("%d", portToBind), Type: types.TCP}
-
+	key := types.SessionKey{Id: fmt.Sprintf("%d", portToBind), Type: types.TunnelTypeTCP}
 	if !s.registry.Register(key, s) {
-		cleanup(fmt.Sprintf("Failed to register TCP client with id: %s", key.Id), portToBind, listener, nil)
-		return
+		return s.denyForwardingRequest(req, nil, listener, fmt.Sprintf("Failed to register TunnelTypeTCP client with id: %s", key.Id))
 	}
 
-	buf := new(bytes.Buffer)
-	err = binary.Write(buf, binary.BigEndian, uint32(portToBind))
+	err = s.finalizeForwarding(req, portToBind, listener, types.TunnelTypeTCP, key.Id)
 	if err != nil {
-		cleanup(fmt.Sprintf("Failed to write port to buffer: %v", err), portToBind, listener, &key)
-		return
+		return s.denyForwardingRequest(req, &key, listener, fmt.Sprintf("Failed to finalize forwarding: %s", err))
 	}
 
-	log.Printf("TCP forwarding approved on port: %d", portToBind)
-	err = req.Reply(true, buf.Bytes())
-	if err != nil {
-		cleanup(fmt.Sprintf("Failed to reply to request: %v", err), portToBind, listener, &key)
-		return
-	}
+	go func() {
+		err = tcpServer.Serve(listener)
+		if err != nil {
+			log.Printf("Failed serving tcp server: %s\n", err)
+		}
+	}()
 
-	s.forwarder.SetType(types.TCP)
-	s.forwarder.SetListener(listener)
-	s.forwarder.SetForwardedPort(portToBind)
-	s.slug.Set(key.Id)
-	s.lifecycle.SetStatus(types.RUNNING)
-	go s.forwarder.AcceptTCPConnections()
+	return nil
 }
 
-func readSSHString(reader *bytes.Reader) (string, error) {
+func readSSHString(reader io.Reader) (string, error) {
 	var length uint32
 	if err := binary.Read(reader, binary.BigEndian, &length); err != nil {
 		return "", err

sonar-project.properties

@@ -0,0 +1 @@
+sonar.projectKey=tunnel-please

types/types.go

@@ -1,25 +1,34 @@
 package types
 
-type Status int
+import "time"
+
+type SessionStatus int
 
 const (
-	INITIALIZING Status = iota
-	RUNNING
+	SessionStatusINITIALIZING SessionStatus = iota
+	SessionStatusRUNNING
 )
 
-type Mode int
+type InteractiveMode int
 
 const (
-	INTERACTIVE Mode = iota
-	HEADLESS
+	InteractiveModeINTERACTIVE InteractiveMode = iota + 1
+	InteractiveModeHEADLESS
 )
 
 type TunnelType int
 
 const (
-	UNKNOWN TunnelType = iota
-	HTTP
-	TCP
+	TunnelTypeUNKNOWN TunnelType = iota
+	TunnelTypeHTTP
+	TunnelTypeTCP
+)
+
+type ServerMode int
+
+const (
+	ServerModeSTANDALONE = iota + 1
+	ServerModeNODE
 )
 
 type SessionKey struct {
@@ -27,6 +36,14 @@ type SessionKey struct {
 	Type TunnelType
 }
 
+type Detail struct {
+	ForwardingType string    `json:"forwarding_type,omitempty"`
+	Slug           string    `json:"slug,omitempty"`
+	UserID         string    `json:"user_id,omitempty"`
+	Active         bool      `json:"active,omitempty"`
+	StartedAt      time.Time `json:"started_at,omitempty"`
+}
+
 var BadGatewayResponse = []byte("HTTP/1.1 502 Bad Gateway\r\n" +
 	"Content-Length: 11\r\n" +
 	"Content-Type: text/plain\r\n\r\n" +