feat: implement sessions request from grpc server

- Replace ReadString with ReadSlice to eliminate allocations
- Use bytes operations instead of strings
- Add FromBytes variant for in-memory parsing

.gitea/workflows/build.yml

@@ -5,6 +5,8 @@ on:
     branches:
       - main
       - staging
+    tags:
+      - 'v*'
     paths:
       - '**.go'
       - 'go.mod'
@@ -15,8 +17,9 @@ on:
       - '.gitea/workflows/build.yml'
 
 jobs:
-  build-and-push:
+  build-and-push-branches:
     runs-on: ubuntu-latest
+    if: github.ref_type == 'branch'
 
     steps:
       - name: Checkout repository
@@ -32,6 +35,17 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
+      - name: Set version variables
+        id: vars
+        run: |
+          if [ "${{ github.ref }}" == "refs/heads/main" ]; then
+            echo "VERSION=dev-main" >> $GITHUB_OUTPUT
+          else
+            echo "VERSION=dev-staging" >> $GITHUB_OUTPUT
+          fi
+          echo "BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
+          echo "COMMIT=${{ github.sha }}" >> $GITHUB_OUTPUT
+
       - name: Build and push Docker image for main
         uses: docker/build-push-action@v6
         with:
@@ -40,6 +54,10 @@ jobs:
           tags: |
             git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:latest
           platforms: linux/amd64,linux/arm64
+          build-args: |
+            VERSION=${{ steps.vars.outputs.VERSION }}
+            BUILD_DATE=${{ steps.vars.outputs.BUILD_DATE }}
+            COMMIT=${{ steps.vars.outputs.COMMIT }}
         if: github.ref == 'refs/heads/main'
 
       - name: Build and push Docker image for staging
@@ -50,4 +68,85 @@ jobs:
           tags: |
             git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:staging
           platforms: linux/amd64,linux/arm64
+          build-args: |
+            VERSION=${{ steps.vars.outputs.VERSION }}
+            BUILD_DATE=${{ steps.vars.outputs.BUILD_DATE }}
+            COMMIT=${{ steps.vars.outputs.COMMIT }}
         if: github.ref == 'refs/heads/staging'
+
+  build-and-push-tags:
+    runs-on: ubuntu-latest
+    if: github.ref_type == 'tag' && startsWith(github.ref, 'refs/tags/v')
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: git.fossy.my.id
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract version and determine release type
+        id: version
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/v}
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
+          echo "BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT
+          echo "COMMIT=${{ github.sha }}" >> $GITHUB_OUTPUT
+          
+          if echo "$VERSION" | grep -qE '^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?$'; then
+            MAJOR=$(echo "$VERSION" | cut -d. -f1)
+            MINOR=$(echo "$VERSION" | cut -d. -f2)
+            
+            echo "MAJOR=$MAJOR" >> $GITHUB_OUTPUT
+            echo "MINOR=$MINOR" >> $GITHUB_OUTPUT
+            
+            if echo "$VERSION" | grep -q '-'; then
+              echo "IS_PRERELEASE=true" >> $GITHUB_OUTPUT
+              echo "ADDITIONAL_TAG=staging" >> $GITHUB_OUTPUT
+            else
+              echo "IS_PRERELEASE=false" >> $GITHUB_OUTPUT
+              echo "ADDITIONAL_TAG=latest" >> $GITHUB_OUTPUT
+            fi
+          else
+            echo "Invalid version format: $VERSION"
+            exit 1
+          fi
+
+      - name: Build and push Docker image for release
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:v${{ steps.version.outputs.VERSION }}
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:v${{ steps.version.outputs.MAJOR }}.${{ steps.version.outputs.MINOR }}
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:v${{ steps.version.outputs.MAJOR }}
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:${{ steps.version.outputs.ADDITIONAL_TAG }}
+          platforms: linux/amd64,linux/arm64
+          build-args: |
+            VERSION=${{ steps.version.outputs.VERSION }}
+            BUILD_DATE=${{ steps.version.outputs.BUILD_DATE }}
+            COMMIT=${{ steps.version.outputs.COMMIT }}
+        if: steps.version.outputs.IS_PRERELEASE == 'false'
+
+      - name: Build and push Docker image for pre-release
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:v${{ steps.version.outputs.VERSION }}
+            git.fossy.my.id/${{ secrets.DOCKER_USERNAME }}/tunnel-please:${{ steps.version.outputs.ADDITIONAL_TAG }}
+          platforms: linux/amd64,linux/arm64
+          build-args: |
+            VERSION=${{ steps.version.outputs.VERSION }}
+            BUILD_DATE=${{ steps.version.outputs.BUILD_DATE }}
+            COMMIT=${{ steps.version.outputs.COMMIT }}
+        if: steps.version.outputs.IS_PRERELEASE == 'true'

Dockerfile

@@ -1,5 +1,9 @@
 FROM golang:1.25.5-alpine AS go_builder
 
+ARG VERSION=dev
+ARG BUILD_DATE=unknown
+ARG COMMIT=unknown
+
 RUN apk update && apk upgrade && \
     apk add --no-cache ca-certificates tzdata git && \
     update-ca-certificates
@@ -18,7 +22,7 @@ RUN --mount=type=cache,target=/go/pkg/mod \
     --mount=type=cache,target=/root/.cache/go-build \
     CGO_ENABLED=0 GOOS=linux \
     go build -trimpath \
-    -ldflags="-w -s" \
+    -ldflags="-w -s -X tunnel_pls/version.Version=${VERSION} -X tunnel_pls/version.BuildDate=${BUILD_DATE} -X tunnel_pls/version.Commit=${COMMIT}" \
     -o /app/tunnel_pls \
     .
 
@@ -28,6 +32,10 @@ RUN adduser -D -u 10001 -g '' appuser && \
 
 FROM scratch
 
+ARG VERSION=dev
+ARG BUILD_DATE=unknown
+ARG COMMIT=unknown
+
 COPY --from=go_builder /usr/share/zoneinfo /usr/share/zoneinfo
 COPY --from=go_builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY --from=go_builder /etc/passwd /etc/passwd
@@ -43,6 +51,9 @@ ENV TZ=Asia/Jakarta
 EXPOSE 2200 8080 8443
 
 LABEL org.opencontainers.image.title="Tunnel Please" \
-      org.opencontainers.image.description="SSH-based tunnel server"
+      org.opencontainers.image.description="SSH-based tunnel server" \
+      org.opencontainers.image.version="${VERSION}" \
+      org.opencontainers.image.revision="${COMMIT}" \
+      org.opencontainers.image.created="${BUILD_DATE}"
 
 ENTRYPOINT ["/app/tunnel_pls"]

README.md

@@ -33,6 +33,10 @@ The following environment variables can be configured in the `.env` file:
 | `BUFFER_SIZE` | Buffer size for io.Copy operations in bytes (4096-1048576) | `32768` | No |
 | `PPROF_ENABLED` | Enable pprof profiling server | `false` | No |
 | `PPROF_PORT` | Port for pprof server | `6060` | No |
+| `MODE` | Runtime mode: `standalone` (default, no gRPC/auth) or `node` (enable gRPC + auth) | `standalone` | No |
+| `GRPC_ADDRESS` | gRPC server address/host used in `node` mode | `localhost` | No |
+| `GRPC_PORT` | gRPC server port used in `node` mode | `8080` | No |
+| `NODE_TOKEN` | Authentication token sent to controller in `node` mode | - (required in `node`) | Yes (node mode) |
 
 **Note:** All environment variables now use UPPERCASE naming. The application includes sensible defaults for all variables, so you can run it without a `.env` file for basic functionality.
 

go.mod

@@ -1,28 +1,55 @@
 module tunnel_pls
 
-go 1.24.4
+go 1.25.5
 
 require (
+	git.fossy.my.id/bagas/tunnel-please-grpc v1.2.0
 	github.com/caddyserver/certmagic v0.25.0
+	github.com/charmbracelet/bubbles v0.21.0
+	github.com/charmbracelet/bubbletea v1.3.10
+	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/joho/godotenv v1.5.1
 	github.com/libdns/cloudflare v0.2.2
+	github.com/muesli/termenv v0.16.0
 	golang.org/x/crypto v0.46.0
+	google.golang.org/grpc v1.78.0
+	google.golang.org/protobuf v1.36.11
 )
 
 require (
+	github.com/atotto/clipboard v0.1.4 // indirect
+	github.com/aymanbagabas/go-osc52/v2 v2.0.1 // indirect
 	github.com/caddyserver/zerossl v0.1.3 // indirect
+	github.com/charmbracelet/colorprofile v0.4.1 // indirect
+	github.com/charmbracelet/x/ansi v0.11.3 // indirect
+	github.com/charmbracelet/x/cellbuf v0.0.14 // indirect
+	github.com/charmbracelet/x/term v0.2.2 // indirect
+	github.com/clipperhouse/displaywidth v0.6.2 // indirect
+	github.com/clipperhouse/stringish v0.1.1 // indirect
+	github.com/clipperhouse/uax29/v2 v2.3.0 // indirect
+	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/libdns/libdns v1.1.1 // indirect
-	github.com/mholt/acmez/v3 v3.1.3 // indirect
+	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
-	github.com/miekg/dns v1.1.68 // indirect
+	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-localereader v0.0.1 // indirect
+	github.com/mattn/go-runewidth v0.0.19 // indirect
+	github.com/mholt/acmez/v3 v3.1.4 // indirect
+	github.com/miekg/dns v1.1.69 // indirect
+	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
+	github.com/muesli/cancelreader v0.2.2 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/sahilm/fuzzy v0.1.1 // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
 	github.com/zeebo/blake3 v0.2.4 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	go.uber.org/zap v1.27.0 // indirect
+	go.uber.org/zap v1.27.1 // indirect
 	go.uber.org/zap/exp v0.3.0 // indirect
-	golang.org/x/mod v0.30.0 // indirect
+	golang.org/x/mod v0.31.0 // indirect
-	golang.org/x/net v0.47.0 // indirect
+	golang.org/x/net v0.48.0 // indirect
 	golang.org/x/sync v0.19.0 // indirect
 	golang.org/x/sys v0.39.0 // indirect
 	golang.org/x/text v0.32.0 // indirect
-	golang.org/x/tools v0.39.0 // indirect
+	golang.org/x/tools v0.40.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251222181119-0a764e51fe1b // indirect
 )

go.sum

@@ -1,56 +1,142 @@
+git.fossy.my.id/bagas/tunnel-please-grpc v1.2.0 h1:BS1dJU3wa2ILgTGwkV95Knle0il0OQtErGqyb6xV7SU=
+git.fossy.my.id/bagas/tunnel-please-grpc v1.2.0/go.mod h1:fG+VkArdkceGB0bNA7IFQus9GetLAwdF5Oi4jdMlXtY=
+github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
+github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
+github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
+github.com/aymanbagabas/go-udiff v0.2.0 h1:TK0fH4MteXUDspT88n8CKzvK0X9O2xu9yQjWpi6yML8=
+github.com/aymanbagabas/go-udiff v0.2.0/go.mod h1:RE4Ex0qsGkTAJoQdQQCA0uG+nAzJO/pI/QwceO5fgrA=
 github.com/caddyserver/certmagic v0.25.0 h1:VMleO/XA48gEWes5l+Fh6tRWo9bHkhwAEhx63i+F5ic=
 github.com/caddyserver/certmagic v0.25.0/go.mod h1:m9yB7Mud24OQbPHOiipAoyKPn9pKHhpSJxXR1jydBxA=
 github.com/caddyserver/zerossl v0.1.3 h1:onS+pxp3M8HnHpN5MMbOMyNjmTheJyWRaZYwn+YTAyA=
 github.com/caddyserver/zerossl v0.1.3/go.mod h1:CxA0acn7oEGO6//4rtrRjYgEoa4MFw/XofZnrYwGqG4=
+github.com/charmbracelet/bubbles v0.21.0 h1:9TdC97SdRVg/1aaXNVWfFH3nnLAwOXr8Fn6u6mfQdFs=
+github.com/charmbracelet/bubbles v0.21.0/go.mod h1:HF+v6QUR4HkEpz62dx7ym2xc71/KBHg+zKwJtMw+qtg=
+github.com/charmbracelet/bubbletea v1.3.10 h1:otUDHWMMzQSB0Pkc87rm691KZ3SWa4KUlvF9nRvCICw=
+github.com/charmbracelet/bubbletea v1.3.10/go.mod h1:ORQfo0fk8U+po9VaNvnV95UPWA1BitP1E0N6xJPlHr4=
+github.com/charmbracelet/colorprofile v0.4.1 h1:a1lO03qTrSIRaK8c3JRxJDZOvhvIeSco3ej+ngLk1kk=
+github.com/charmbracelet/colorprofile v0.4.1/go.mod h1:U1d9Dljmdf9DLegaJ0nGZNJvoXAhayhmidOdcBwAvKk=
+github.com/charmbracelet/lipgloss v1.1.0 h1:vYXsiLHVkK7fp74RkV7b2kq9+zDLoEU4MZoFqR/noCY=
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+github.com/charmbracelet/x/ansi v0.11.3 h1:6DcVaqWI82BBVM/atTyq6yBoRLZFBsnoDoX9GCu2YOI=
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+github.com/charmbracelet/x/cellbuf v0.0.14 h1:iUEMryGyFTelKW3THW4+FfPgi4fkmKnnaLOXuc+/Kj4=
+github.com/charmbracelet/x/cellbuf v0.0.14/go.mod h1:P447lJl49ywBbil/KjCk2HexGh4tEY9LH0/1QrZZ9rA=
+github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91 h1:payRxjMjKgx2PaCWLZ4p3ro9y97+TVLZNaRZgJwSVDQ=
+github.com/charmbracelet/x/exp/golden v0.0.0-20241011142426-46044092ad91/go.mod h1:wDlXFlCrmJ8J+swcL/MnGUuYnqgQdW9rhSD61oNMb6U=
+github.com/charmbracelet/x/term v0.2.2 h1:xVRT/S2ZcKdhhOuSP4t5cLi5o+JxklsoEObBSgfgZRk=
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+github.com/clipperhouse/displaywidth v0.6.2 h1:ZDpTkFfpHOKte4RG5O/BOyf3ysnvFswpyYrV7z2uAKo=
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 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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-github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
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 github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
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 github.com/libdns/libdns v1.1.1 h1:wPrHrXILoSHKWJKGd0EiAVmiJbFShguILTg9leS/P/U=
 github.com/libdns/libdns v1.1.1/go.mod h1:4Bj9+5CQiNMVGf87wjX4CY3HQJypUHRuLvlsfsZqLWQ=
-github.com/mholt/acmez/v3 v3.1.3 h1:gUl789rjbJSuM5hYzOFnNaGgWPV1xVfnOs59o0dZEcc=
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internal/config/config.go

@@ -0,0 +1,35 @@
+package config
+
+import (
+	"log"
+	"os"
+	"strconv"
+
+	"github.com/joho/godotenv"
+)
+
+func init() {
+	if _, err := os.Stat(".env"); err == nil {
+		if err := godotenv.Load(".env"); err != nil {
+			log.Printf("Warning: Failed to load .env file: %s", err)
+		}
+	}
+}
+
+func Getenv(key, defaultValue string) string {
+	val := os.Getenv(key)
+	if val == "" {
+		val = defaultValue
+	}
+
+	return val
+}
+
+func GetBufferSize() int {
+	sizeStr := Getenv("BUFFER_SIZE", "32768")
+	size, err := strconv.Atoi(sizeStr)
+	if err != nil || size < 4096 || size > 1048576 {
+		return 32768
+	}
+	return size
+}

internal/grpc/client/client.go

@@ -0,0 +1,377 @@
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"time"
+	"tunnel_pls/internal/config"
+
+	"tunnel_pls/session"
+
+	proto "git.fossy.my.id/bagas/tunnel-please-grpc/gen"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/grpc/health/grpc_health_v1"
+	"google.golang.org/grpc/keepalive"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+type GrpcConfig struct {
+	Address             string
+	UseTLS              bool
+	InsecureSkipVerify  bool
+	Timeout             time.Duration
+	KeepAlive           bool
+	MaxRetries          int
+	KeepAliveTime       time.Duration
+	KeepAliveTimeout    time.Duration
+	PermitWithoutStream bool
+}
+
+type Client struct {
+	conn                       *grpc.ClientConn
+	config                     *GrpcConfig
+	sessionRegistry            session.Registry
+	slugService                proto.SlugChangeClient
+	eventService               proto.EventServiceClient
+	authorizeConnectionService proto.UserServiceClient
+}
+
+func DefaultConfig() *GrpcConfig {
+	return &GrpcConfig{
+		Address:             "localhost:50051",
+		UseTLS:              false,
+		InsecureSkipVerify:  false,
+		Timeout:             10 * time.Second,
+		KeepAlive:           true,
+		MaxRetries:          3,
+		KeepAliveTime:       2 * time.Minute,
+		KeepAliveTimeout:    10 * time.Second,
+		PermitWithoutStream: false,
+	}
+}
+
+func New(config *GrpcConfig, sessionRegistry session.Registry) (*Client, error) {
+	if config == nil {
+		config = DefaultConfig()
+	} else {
+		defaults := DefaultConfig()
+		if config.Address == "" {
+			config.Address = defaults.Address
+		}
+		if config.Timeout == 0 {
+			config.Timeout = defaults.Timeout
+		}
+		if config.MaxRetries == 0 {
+			config.MaxRetries = defaults.MaxRetries
+		}
+		if config.KeepAliveTime == 0 {
+			config.KeepAliveTime = defaults.KeepAliveTime
+		}
+		if config.KeepAliveTimeout == 0 {
+			config.KeepAliveTimeout = defaults.KeepAliveTimeout
+		}
+	}
+
+	var opts []grpc.DialOption
+
+	if config.UseTLS {
+		tlsConfig := &tls.Config{
+			InsecureSkipVerify: config.InsecureSkipVerify,
+		}
+		creds := credentials.NewTLS(tlsConfig)
+		opts = append(opts, grpc.WithTransportCredentials(creds))
+	} else {
+		opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	}
+
+	if config.KeepAlive {
+		kaParams := keepalive.ClientParameters{
+			Time:                config.KeepAliveTime,
+			Timeout:             config.KeepAliveTimeout,
+			PermitWithoutStream: config.PermitWithoutStream,
+		}
+		opts = append(opts, grpc.WithKeepaliveParams(kaParams))
+	}
+
+	opts = append(opts,
+		grpc.WithDefaultCallOptions(
+			grpc.MaxCallRecvMsgSize(4*1024*1024),
+			grpc.MaxCallSendMsgSize(4*1024*1024),
+		),
+	)
+
+	conn, err := grpc.NewClient(config.Address, opts...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to gRPC server at %s: %w", config.Address, err)
+	}
+
+	slugService := proto.NewSlugChangeClient(conn)
+	eventService := proto.NewEventServiceClient(conn)
+	authorizeConnectionService := proto.NewUserServiceClient(conn)
+
+	return &Client{
+		conn:                       conn,
+		config:                     config,
+		slugService:                slugService,
+		sessionRegistry:            sessionRegistry,
+		eventService:               eventService,
+		authorizeConnectionService: authorizeConnectionService,
+	}, nil
+}
+
+func (c *Client) SubscribeEvents(ctx context.Context, identity, authToken string) error {
+	const (
+		baseBackoff = time.Second
+		maxBackoff  = 30 * time.Second
+	)
+
+	backoff := baseBackoff
+	wait := func() error {
+		if backoff <= 0 {
+			return nil
+		}
+		select {
+		case <-time.After(backoff):
+			return nil
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+	growBackoff := func() {
+		backoff *= 2
+		if backoff > maxBackoff {
+			backoff = maxBackoff
+		}
+	}
+
+	for {
+		subscribe, err := c.eventService.Subscribe(ctx)
+		if err != nil {
+			if !isConnectionError(err) {
+				return err
+			}
+			if status.Code(err) == codes.Unauthenticated {
+				return err
+			}
+			if err := wait(); err != nil {
+				return err
+			}
+			growBackoff()
+			continue
+		}
+
+		err = subscribe.Send(&proto.Node{
+			Type: proto.EventType_AUTHENTICATION,
+			Payload: &proto.Node_AuthEvent{
+				AuthEvent: &proto.Authentication{
+					Identity:  identity,
+					AuthToken: authToken,
+				},
+			},
+		})
+
+		if err != nil {
+			log.Println("Authentication failed to send to gRPC server:", err)
+			if isConnectionError(err) {
+				if err := wait(); err != nil {
+					return err
+				}
+				growBackoff()
+				continue
+			}
+			return err
+		}
+		log.Println("Authentication Successfully sent to gRPC server")
+		backoff = baseBackoff
+
+		if err = c.processEventStream(subscribe); err != nil {
+			if isConnectionError(err) {
+				log.Printf("Reconnect to controller within %v sec", backoff.Seconds())
+				if err := wait(); err != nil {
+					return err
+				}
+				growBackoff()
+				continue
+			}
+			return err
+		}
+	}
+}
+
+func (c *Client) processEventStream(subscribe grpc.BidiStreamingClient[proto.Node, proto.Events]) error {
+	for {
+		recv, err := subscribe.Recv()
+		if err != nil {
+			if isConnectionError(err) {
+				log.Printf("connection error receiving from gRPC server: %v", err)
+				return err
+			}
+			if status.Code(err) == codes.Unauthenticated {
+				log.Printf("Authentication failed: %v", err)
+				return err
+			}
+			log.Printf("non-connection receive error from gRPC server: %v", err)
+			continue
+		}
+		switch recv.GetType() {
+		case proto.EventType_SLUG_CHANGE:
+			oldSlug := recv.GetSlugEvent().GetOld()
+			newSlug := recv.GetSlugEvent().GetNew()
+			sess, err := c.sessionRegistry.Get(oldSlug)
+			if err != nil {
+				errSend := subscribe.Send(&proto.Node{
+					Type: proto.EventType_SLUG_CHANGE_RESPONSE,
+					Payload: &proto.Node_SlugEventResponse{
+						SlugEventResponse: &proto.SlugChangeEventResponse{
+							Success: false,
+							Message: err.Error(),
+						},
+					},
+				})
+				if errSend != nil {
+					if isConnectionError(errSend) {
+						log.Printf("connection error sending slug change failure: %v", errSend)
+						return errSend
+					}
+					log.Printf("non-connection send error for slug change failure: %v", errSend)
+				}
+				continue
+			}
+			err = c.sessionRegistry.Update(oldSlug, newSlug)
+			if err != nil {
+				errSend := subscribe.Send(&proto.Node{
+					Type: proto.EventType_SLUG_CHANGE_RESPONSE,
+					Payload: &proto.Node_SlugEventResponse{
+						SlugEventResponse: &proto.SlugChangeEventResponse{
+							Success: false,
+							Message: err.Error(),
+						},
+					},
+				})
+				if errSend != nil {
+					if isConnectionError(errSend) {
+						log.Printf("connection error sending slug change failure: %v", errSend)
+						return errSend
+					}
+					log.Printf("non-connection send error for slug change failure: %v", errSend)
+				}
+				continue
+			}
+			sess.GetInteraction().Redraw()
+			err = subscribe.Send(&proto.Node{
+				Type: proto.EventType_SLUG_CHANGE_RESPONSE,
+				Payload: &proto.Node_SlugEventResponse{
+					SlugEventResponse: &proto.SlugChangeEventResponse{
+						Success: true,
+						Message: "",
+					},
+				},
+			})
+			if err != nil {
+				if isConnectionError(err) {
+					log.Printf("connection error sending slug change success: %v", err)
+					return err
+				}
+				log.Printf("non-connection send error for slug change success: %v", err)
+				continue
+			}
+		case proto.EventType_GET_SESSIONS:
+			sessions := c.sessionRegistry.GetAllSessionFromUser(recv.GetGetSessionsEvent().GetIdentity())
+			var details []*proto.Detail
+			for _, ses := range sessions {
+				detail := ses.Detail()
+				details = append(details, &proto.Detail{
+					Node:           config.Getenv("domain", "localhost"),
+					ForwardingType: detail.ForwardingType,
+					Slug:           detail.Slug,
+					UserId:         detail.UserID,
+					Active:         detail.Active,
+					StartedAt:      timestamppb.New(detail.StartedAt),
+				})
+			}
+			err = subscribe.Send(&proto.Node{
+				Type: proto.EventType_GET_SESSIONS,
+				Payload: &proto.Node_GetSessionsEvent{
+					GetSessionsEvent: &proto.GetSessionsResponse{
+						Details: details,
+					},
+				},
+			})
+			if err != nil {
+				if isConnectionError(err) {
+					log.Printf("connection error sending sessions success: %v", err)
+					return err
+				}
+				log.Printf("non-connection send error for sessions success: %v", err)
+				continue
+			}
+		default:
+			log.Printf("Unknown event type received: %v", recv.GetType())
+		}
+	}
+}
+
+func (c *Client) GetConnection() *grpc.ClientConn {
+	return c.conn
+}
+
+func (c *Client) AuthorizeConn(ctx context.Context, token string) (authorized bool, user string, err error) {
+	check, err := c.authorizeConnectionService.Check(ctx, &proto.CheckRequest{AuthToken: token})
+	if err != nil {
+		return false, "UNAUTHORIZED", err
+	}
+
+	if check.GetResponse() == proto.AuthorizationResponse_MESSAGE_TYPE_UNAUTHORIZED {
+		return false, "UNAUTHORIZED", nil
+	}
+	return true, check.GetUser(), nil
+}
+
+func (c *Client) Close() error {
+	if c.conn != nil {
+		log.Printf("Closing gRPC connection to %s", c.config.Address)
+		return c.conn.Close()
+	}
+	return nil
+}
+
+func (c *Client) CheckServerHealth(ctx context.Context) error {
+	healthClient := grpc_health_v1.NewHealthClient(c.GetConnection())
+	resp, err := healthClient.Check(ctx, &grpc_health_v1.HealthCheckRequest{
+		Service: "",
+	})
+	if err != nil {
+		return fmt.Errorf("health check failed: %w", err)
+	}
+	if resp.Status != grpc_health_v1.HealthCheckResponse_SERVING {
+		return fmt.Errorf("server not serving: %v", resp.Status)
+	}
+	return nil
+}
+
+func (c *Client) GetConfig() *GrpcConfig {
+	return c.config
+}
+
+func isConnectionError(err error) bool {
+	if err == nil {
+		return false
+	}
+	if errors.Is(err, io.EOF) {
+		return true
+	}
+	switch status.Code(err) {
+	case codes.Unavailable, codes.Canceled, codes.DeadlineExceeded:
+		return true
+	default:
+		return false
+	}
+}

internal/key/key.go

@@ -1,4 +1,4 @@
-package utils
+package key
 
 import (
 	"crypto/rand"
@@ -6,54 +6,12 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"log"
-	mathrand "math/rand"
 	"os"
 	"path/filepath"
-	"strconv"
-	"strings"
-	"time"
 
-	"github.com/joho/godotenv"
 	"golang.org/x/crypto/ssh"
 )
 
-func init() {
-	if _, err := os.Stat(".env"); err == nil {
-		if err := godotenv.Load(".env"); err != nil {
-			log.Printf("Warning: Failed to load .env file: %s", err)
-		}
-	}
-}
-
-func GenerateRandomString(length int) string {
-	const charset = "abcdefghijklmnopqrstuvwxyz"
-	seededRand := mathrand.New(mathrand.NewSource(time.Now().UnixNano() + int64(mathrand.Intn(9999))))
-	var result strings.Builder
-	for i := 0; i < length; i++ {
-		randomIndex := seededRand.Intn(len(charset))
-		result.WriteString(string(charset[randomIndex]))
-	}
-	return result.String()
-}
-
-func Getenv(key, defaultValue string) string {
-	val := os.Getenv(key)
-	if val == "" {
-		val = defaultValue
-	}
-
-	return val
-}
-
-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 GenerateSSHKeyIfNotExist(keyPath string) error {
 	if _, err := os.Stat(keyPath); err == nil {
 		log.Printf("SSH key already exists at %s", keyPath)

internal/port/port.go

@@ -6,7 +6,7 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"tunnel_pls/utils"
+	"tunnel_pls/internal/config"
 )
 
 type Manager interface {
@@ -28,7 +28,7 @@ var Default Manager = &manager{
 }
 
 func init() {
-	rawRange := utils.Getenv("ALLOWED_PORTS", "")
+	rawRange := config.Getenv("ALLOWED_PORTS", "")
 	if rawRange == "" {
 		return
 	}

internal/random/random.go

@@ -0,0 +1,18 @@
+package random
+
+import (
+	mathrand "math/rand"
+	"strings"
+	"time"
+)
+
+func GenerateRandomString(length int) string {
+	const charset = "abcdefghijklmnopqrstuvwxyz"
+	seededRand := mathrand.New(mathrand.NewSource(time.Now().UnixNano() + int64(mathrand.Intn(9999))))
+	var result strings.Builder
+	for i := 0; i < length; i++ {
+		randomIndex := seededRand.Intn(len(charset))
+		result.WriteString(string(charset[randomIndex]))
+	}
+	return result.String()
+}

main.go

@@ -1,24 +1,41 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"net/http"
 	_ "net/http/pprof"
 	"os"
+	"strings"
+	"time"
+	"tunnel_pls/internal/config"
+	"tunnel_pls/internal/grpc/client"
+	"tunnel_pls/internal/key"
 	"tunnel_pls/server"
-	"tunnel_pls/utils"
+	"tunnel_pls/session"
+	"tunnel_pls/version"
 
 	"golang.org/x/crypto/ssh"
 )
 
 func main() {
+	if len(os.Args) > 1 && (os.Args[1] == "--version" || os.Args[1] == "-v") {
+		fmt.Println(version.GetVersion())
+		os.Exit(0)
+	}
+
 	log.SetOutput(os.Stdout)
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 
-	pprofEnabled := utils.Getenv("PPROF_ENABLED", "false")
+	log.Printf("Starting %s", version.GetVersion())
+
+	mode := strings.ToLower(config.Getenv("MODE", "standalone"))
+	isNodeMode := mode == "node"
+
+	pprofEnabled := config.Getenv("PPROF_ENABLED", "false")
 	if pprofEnabled == "true" {
-		pprofPort := utils.Getenv("PPROF_PORT", "6060")
+		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)
@@ -30,11 +47,11 @@ func main() {
 
 	sshConfig := &ssh.ServerConfig{
 		NoClientAuth:  true,
-		ServerVersion: "SSH-2.0-TunnlPls-1.0",
+		ServerVersion: fmt.Sprintf("SSH-2.0-TunnlPls-%s", version.GetShortVersion()),
 	}
 
 	sshKeyPath := "certs/ssh/id_rsa"
-	if err := utils.GenerateSSHKeyIfNotExist(sshKeyPath); err != nil {
+	if err := key.GenerateSSHKeyIfNotExist(sshKeyPath); err != nil {
 		log.Fatalf("Failed to generate SSH key: %s", err)
 	}
 
@@ -49,6 +66,62 @@ func main() {
 	}
 
 	sshConfig.AddHostKey(private)
-	app := server.NewServer(sshConfig)
+	sessionRegistry := session.NewRegistry()
+
+	var grpcClient *client.Client
+	var cancel context.CancelFunc = func() {}
+	var ctx context.Context = context.Background()
+
+	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")
+			return
+		}
+		
+		grpcClient, err = client.New(&client.GrpcConfig{
+			Address:            grpcAddr,
+			UseTLS:             false,
+			InsecureSkipVerify: false,
+			Timeout:            10 * time.Second,
+			KeepAlive:          true,
+			MaxRetries:         3,
+		}, sessionRegistry)
+		if err != nil {
+			return
+		}
+		defer func(grpcClient *client.Client) {
+			err := grpcClient.Close()
+			if err != nil {
+
+			}
+		}(grpcClient)
+
+		ctx, cancel = context.WithTimeout(context.Background(), time.Second*5)
+		err = grpcClient.CheckServerHealth(ctx)
+		if err != nil {
+			log.Fatalf("gRPC health check failed: %s", err)
+			return
+		}
+		cancel()
+
+		ctx, cancel = context.WithCancel(context.Background())
+		go func() {
+			identity := config.Getenv("DOMAIN", "localhost")
+			err = grpcClient.SubscribeEvents(ctx, identity, nodeToken)
+			if err != nil {
+				return
+			}
+		}()
+	}
+
+	app, err := server.NewServer(sshConfig, sessionRegistry, grpcClient)
+	if err != nil {
+		log.Fatalf("Failed to start server: %s", err)
+	}
 	app.Start()
+	cancel()
 }

renovate.json

@@ -11,7 +11,7 @@
         "digest"
       ],
       "automerge": true,
-      "baseBranches": [
+      "baseBranchPatterns": [
         "staging"
       ]
     }

server/handler.go

@@ -1,28 +0,0 @@
-package server
-
-import (
-	"log"
-	"net"
-	"tunnel_pls/session"
-
-	"golang.org/x/crypto/ssh"
-)
-
-func (s *Server) handleConnection(conn net.Conn) {
-	sshConn, chans, forwardingReqs, err := ssh.NewServerConn(conn, s.config)
-	if err != nil {
-		log.Printf("failed to establish SSH connection: %v", err)
-		err := conn.Close()
-		if err != nil {
-			log.Printf("failed to close SSH connection: %v", err)
-			return
-		}
-		return
-	}
-
-	log.Println("SSH connection established:", sshConn.User())
-
-	session.New(sshConn, forwardingReqs, chans)
-
-	return
-}

server/header.go

@@ -4,7 +4,6 @@ import (
 	"bufio"
 	"bytes"
 	"fmt"
-	"strings"
 )
 
 type HeaderManager interface {
@@ -44,43 +43,132 @@ type requestHeaderFactory struct {
 	headers   map[string]string
 }
 
-func NewRequestHeaderFactory(br *bufio.Reader) (RequestHeaderManager, error) {
+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),
+		headers: make(map[string]string, 16),
 	}
 
-	startLine, err := br.ReadString('\n')
+	lineEnd := bytes.IndexByte(headerData, '\n')
-	if err != nil {
+	if lineEnd == -1 {
-		return nil, err
+		return nil, fmt.Errorf("invalid request: no newline found")
 	}
-	startLine = strings.TrimRight(startLine, "\r\n")
-	header.startLine = []byte(startLine)
 
-	parts := strings.Split(startLine, " ")
+	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 = parts[0]
+	header.method = string(parts[0])
-	header.path = parts[1]
+	header.path = string(parts[1])
-	header.version = parts[2]
+	header.version = string(parts[2])
 
-	for {
+	remaining := headerData[lineEnd+1:]
-		line, err := br.ReadString('\n')
+
-		if err != nil {
+	for len(remaining) > 0 {
-			return nil, err
+		lineEnd = bytes.IndexByte(remaining, '\n')
+		if lineEnd == -1 {
+			lineEnd = len(remaining)
 		}
-		line = strings.TrimRight(line, "\r\n")
 
-		if line == "" {
+		line := bytes.TrimRight(remaining[:lineEnd], "\r\n")
+
+		if len(line) == 0 {
 			break
 		}
 
-		kv := strings.SplitN(line, ":", 2)
+		colonIdx := bytes.IndexByte(line, ':')
-		if len(kv) != 2 {
+		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
 		}
-		header.headers[strings.TrimSpace(kv[0])] = strings.TrimSpace(kv[1])
+
+		key := bytes.TrimSpace(lineBytes[:colonIdx])
+		value := bytes.TrimSpace(lineBytes[colonIdx+1:])
+
+		header.headers[string(key)] = string(value)
 	}
 
 	return header, nil

server/http.go

@@ -11,21 +11,15 @@ import (
 	"regexp"
 	"strings"
 	"time"
+	"tunnel_pls/internal/config"
 	"tunnel_pls/session"
-	"tunnel_pls/utils"
 
 	"golang.org/x/crypto/ssh"
 )
 
-type Interaction interface {
-	SendMessage(message string)
-}
-
 type HTTPWriter interface {
 	io.Reader
 	io.Writer
-	SetInteraction(interaction Interaction)
-	AddInteraction(interaction Interaction)
 	GetRemoteAddr() net.Addr
 	GetWriter() io.Writer
 	AddResponseMiddleware(mw ResponseMiddleware)
@@ -35,21 +29,16 @@ type HTTPWriter interface {
 }
 
 type customWriter struct {
-	remoteAddr  net.Addr
+	remoteAddr net.Addr
-	writer      io.Writer
+	writer     io.Writer
-	reader      io.Reader
+	reader     io.Reader
-	headerBuf   []byte
+	headerBuf  []byte
-	buf         []byte
+	buf        []byte
-	respHeader  ResponseHeaderManager
+	respHeader ResponseHeaderManager
-	reqHeader   RequestHeaderManager
+	reqHeader  RequestHeaderManager
-	interaction Interaction
+	respMW     []ResponseMiddleware
-	respMW      []ResponseMiddleware
+	reqStartMW []RequestMiddleware
-	reqStartMW  []RequestMiddleware
+	reqEndMW   []RequestMiddleware
-	reqEndMW    []RequestMiddleware
-}
-
-func (cw *customWriter) SetInteraction(interaction Interaction) {
-	cw.interaction = interaction
 }
 
 func (cw *customWriter) GetRemoteAddr() net.Addr {
@@ -110,8 +99,7 @@ func (cw *customWriter) Read(p []byte) (int, error) {
 		}
 	}
 
-	headerReader := bufio.NewReader(bytes.NewReader(header))
+	reqhf, err := NewRequestHeaderFactory(header)
-	reqhf, err := NewRequestHeaderFactory(headerReader)
 	if err != nil {
 		return 0, err
 	}
@@ -135,11 +123,10 @@ func (cw *customWriter) Read(p []byte) (int, error) {
 
 func NewCustomWriter(writer io.Writer, reader io.Reader, remoteAddr net.Addr) HTTPWriter {
 	return &customWriter{
-		remoteAddr:  remoteAddr,
+		remoteAddr: remoteAddr,
-		writer:      writer,
+		writer:     writer,
-		reader:      reader,
+		reader:     reader,
-		buf:         make([]byte, 0, 4096),
+		buf:        make([]byte, 0, 4096),
-		interaction: nil,
 	}
 }
 
@@ -224,19 +211,29 @@ func (cw *customWriter) Write(p []byte) (int, error) {
 	return len(p), nil
 }
 
-func (cw *customWriter) AddInteraction(interaction Interaction) {
-	cw.interaction = interaction
-}
-
 var redirectTLS = false
 
-func NewHTTPServer() error {
+type HTTPServer interface {
-	httpPort := utils.Getenv("HTTP_PORT", "8080")
+	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 utils.Getenv("TLS_ENABLED", "false") == "true" && utils.Getenv("TLS_REDIRECT", "false") == "true" {
+	if config.Getenv("TLS_ENABLED", "false") == "true" && config.Getenv("TLS_REDIRECT", "false") == "true" {
 		redirectTLS = true
 	}
 	go func() {
@@ -251,13 +248,13 @@ func NewHTTPServer() error {
 				continue
 			}
 
-			go Handler(conn)
+			go hs.handler(conn)
 		}
 	}()
 	return nil
 }
 
-func Handler(conn net.Conn) {
+func (hs *httpServer) handler(conn net.Conn) {
 	defer func() {
 		err := conn.Close()
 		if err != nil && !errors.Is(err, net.ErrClosed) {
@@ -288,7 +285,7 @@ func Handler(conn net.Conn) {
 
 	if redirectTLS {
 		_, err = conn.Write([]byte("HTTP/1.1 301 Moved Permanently\r\n" +
-			fmt.Sprintf("Location: https://%s.%s/\r\n", slug, utils.Getenv("DOMAIN", "localhost")) +
+			fmt.Sprintf("Location: https://%s.%s/\r\n", slug, config.Getenv("DOMAIN", "localhost")) +
 			"Content-Length: 0\r\n" +
 			"Connection: close\r\n" +
 			"\r\n"))
@@ -316,8 +313,8 @@ func Handler(conn net.Conn) {
 		return
 	}
 
-	sshSession, ok := session.Clients[slug]
+	sshSession, err := hs.sessionRegistry.Get(slug)
-	if !ok {
+	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" +
@@ -330,7 +327,6 @@ func Handler(conn net.Conn) {
 		return
 	}
 	cw := NewCustomWriter(conn, dstReader, conn.RemoteAddr())
-	cw.SetInteraction(sshSession.GetInteraction())
 	forwardRequest(cw, reqhf, sshSession)
 	return
 }

server/https.go

@@ -8,13 +8,12 @@ import (
 	"log"
 	"net"
 	"strings"
-	"tunnel_pls/session"
+	"tunnel_pls/internal/config"
-	"tunnel_pls/utils"
 )
 
-func NewHTTPSServer() error {
+func (hs *httpServer) ListenAndServeTLS() error {
-	domain := utils.Getenv("DOMAIN", "localhost")
+	domain := config.Getenv("DOMAIN", "localhost")
-	httpsPort := utils.Getenv("HTTPS_PORT", "8443")
+	httpsPort := config.Getenv("HTTPS_PORT", "8443")
 
 	tlsConfig, err := NewTLSConfig(domain)
 	if err != nil {
@@ -38,13 +37,13 @@ func NewHTTPSServer() error {
 				continue
 			}
 
-			go HandlerTLS(conn)
+			go hs.handlerTLS(conn)
 		}
 	}()
 	return nil
 }
 
-func HandlerTLS(conn net.Conn) {
+func (hs *httpServer) handlerTLS(conn net.Conn) {
 	defer func() {
 		err := conn.Close()
 		if err != nil {
@@ -90,8 +89,8 @@ func HandlerTLS(conn net.Conn) {
 		return
 	}
 
-	sshSession, ok := session.Clients[slug]
+	sshSession, err := hs.sessionRegistry.Get(slug)
-	if !ok {
+	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" +
@@ -104,7 +103,6 @@ func HandlerTLS(conn net.Conn) {
 		return
 	}
 	cw := NewCustomWriter(conn, dstReader, conn.RemoteAddr())
-	cw.SetInteraction(sshSession.GetInteraction())
 	forwardRequest(cw, reqhf, sshSession)
 	return
 }

server/server.go

@@ -1,53 +1,52 @@
 package server
 
 import (
+	"context"
 	"fmt"
 	"log"
 	"net"
-	"net/http"
+	"tunnel_pls/internal/config"
-	"tunnel_pls/utils"
+	"tunnel_pls/internal/grpc/client"
+	"tunnel_pls/session"
 
 	"golang.org/x/crypto/ssh"
 )
 
 type Server struct {
-	conn       *net.Listener
+	conn            *net.Listener
-	config     *ssh.ServerConfig
+	config          *ssh.ServerConfig
-	httpServer *http.Server
+	sessionRegistry session.Registry
+	grpcClient      *client.Client
 }
 
-func (s *Server) GetConn() *net.Listener {
+func NewServer(sshConfig *ssh.ServerConfig, sessionRegistry session.Registry, grpcClient *client.Client) (*Server, error) {
-	return s.conn
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%s", config.Getenv("PORT", "2200")))
-}
-
-func (s *Server) GetConfig() *ssh.ServerConfig {
-	return s.config
-}
-
-func (s *Server) GetHttpServer() *http.Server {
-	return s.httpServer
-}
-
-func NewServer(config *ssh.ServerConfig) *Server {
-	listener, err := net.Listen("tcp", fmt.Sprintf(":%s", utils.Getenv("PORT", "2200")))
 	if err != nil {
 		log.Fatalf("failed to listen on port 2200: %v", err)
-		return nil
+		return nil, err
 	}
-	if utils.Getenv("TLS_ENABLED", "false") == "true" {
+
-		err = NewHTTPSServer()
+	HttpServer := NewHTTPServer(sessionRegistry)
-		if err != nil {
+	err = HttpServer.ListenAndServe()
-			log.Fatalf("failed to start https server: %v", err)
-		}
-	}
-	err = NewHTTPServer()
 	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{
-		conn:   &listener,
+		conn:            &listener,
-		config: config,
+		config:          sshConfig,
-	}
+		sessionRegistry: sessionRegistry,
+		grpcClient:      grpcClient,
+	}, nil
 }
 
 func (s *Server) Start() {
@@ -62,3 +61,39 @@ func (s *Server) Start() {
 		go s.handleConnection(conn)
 	}
 }
+
+func (s *Server) handleConnection(conn net.Conn) {
+	sshConn, chans, forwardingReqs, err := ssh.NewServerConn(conn, s.config)
+	defer func(sshConn *ssh.ServerConn) {
+		err = sshConn.Close()
+		if err != nil {
+			log.Printf("failed to close SSH server: %v", err)
+		}
+	}(sshConn)
+
+	if err != nil {
+		log.Printf("failed to establish SSH connection: %v", err)
+		err := conn.Close()
+		if err != nil {
+			log.Printf("failed to close SSH connection: %v", err)
+			return
+		}
+		return
+	}
+	ctx := context.Background()
+	log.Println("SSH connection established:", sshConn.User())
+
+	user := "UNAUTHORIZED"
+	if s.grpcClient != nil {
+		_, u, _ := s.grpcClient.AuthorizeConn(ctx, sshConn.User())
+		user = u
+	}
+
+	sshSession := session.New(sshConn, forwardingReqs, chans, s.sessionRegistry, user)
+	err = sshSession.Start()
+	if err != nil {
+		log.Printf("SSH session ended with error: %v", err)
+		return
+	}
+	return
+}

server/tls.go

@@ -10,7 +10,7 @@ import (
 	"os"
 	"sync"
 	"time"
-	"tunnel_pls/utils"
+	"tunnel_pls/internal/config"
 
 	"github.com/caddyserver/certmagic"
 	"github.com/libdns/cloudflare"
@@ -92,7 +92,7 @@ func NewTLSConfig(domain string) (*tls.Config, error) {
 }
 
 func isACMEConfigComplete() bool {
-	cfAPIToken := utils.Getenv("CF_API_TOKEN", "")
+	cfAPIToken := config.Getenv("CF_API_TOKEN", "")
 	return cfAPIToken != ""
 }
 
@@ -241,9 +241,9 @@ func (tm *tlsManager) initCertMagic() error {
 		return fmt.Errorf("failed to create cert storage directory: %w", err)
 	}
 
-	acmeEmail := utils.Getenv("ACME_EMAIL", "admin@"+tm.domain)
+	acmeEmail := config.Getenv("ACME_EMAIL", "admin@"+tm.domain)
-	cfAPIToken := utils.Getenv("CF_API_TOKEN", "")
+	cfAPIToken := config.Getenv("CF_API_TOKEN", "")
-	acmeStaging := utils.Getenv("ACME_STAGING", "false") == "true"
+	acmeStaging := config.Getenv("ACME_STAGING", "false") == "true"
 
 	if cfAPIToken == "" {
 		return fmt.Errorf("CF_API_TOKEN environment variable is required for automatic certificate generation")
@@ -301,7 +301,22 @@ func (tm *tlsManager) initCertMagic() error {
 func (tm *tlsManager) getTLSConfig() *tls.Config {
 	return &tls.Config{
 		GetCertificate: tm.getCertificate,
-		MinVersion:     tls.VersionTLS12,
+		MinVersion:     tls.VersionTLS13,
+		MaxVersion:     tls.VersionTLS13,
+
+		SessionTicketsDisabled: false,
+
+		CipherSuites: []uint16{
+			tls.TLS_AES_128_GCM_SHA256,
+			tls.TLS_CHACHA20_POLY1305_SHA256,
+		},
+
+		CurvePreferences: []tls.CurveID{
+			tls.X25519,
+		},
+
+		ClientAuth: tls.NoClientCert,
+		NextProtos: nil,
 	}
 }
 

session/forwarder/forwarder.go

@@ -10,16 +10,16 @@ import (
 	"strconv"
 	"sync"
 	"time"
+	"tunnel_pls/internal/config"
 	"tunnel_pls/session/slug"
 	"tunnel_pls/types"
-	"tunnel_pls/utils"
 
 	"golang.org/x/crypto/ssh"
 )
 
 var bufferPool = sync.Pool{
 	New: func() interface{} {
-		bufSize := utils.GetBufferSize()
+		bufSize := config.GetBufferSize()
 		return make([]byte, bufSize)
 	},
 }
@@ -152,25 +152,26 @@ func (f *Forwarder) HandleConnection(dst io.ReadWriter, src ssh.Channel, remoteA
 
 	log.Printf("Handling new forwarded connection from %s", remoteAddr)
 
-	done := make(chan struct{}, 2)
+	var wg sync.WaitGroup
-
+	wg.Add(2)
-	go func() {
-		_, err := copyWithBuffer(src, dst)
-		if err != nil && !errors.Is(err, io.EOF) && !errors.Is(err, net.ErrClosed) {
-			log.Printf("Error copying from conn.Reader to channel: %v", err)
-		}
-		done <- struct{}{}
-	}()
 
 	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 from channel to conn.Writer: %v", err)
+			log.Printf("Error copying src→dst: %v", err)
 		}
-		done <- struct{}{}
 	}()
 
-	<-done
+	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)
+		}
+	}()
+
+	wg.Wait()
 }
 
 func (f *Forwarder) SetType(tunnelType types.TunnelType) {

session/handler.go

@@ -7,10 +7,9 @@ import (
 	"log"
 	"net"
 	portUtil "tunnel_pls/internal/port"
+	"tunnel_pls/internal/random"
 	"tunnel_pls/types"
 
-	"tunnel_pls/utils"
-
 	"golang.org/x/crypto/ssh"
 )
 
@@ -19,7 +18,28 @@ var blockedReservedPorts = []uint16{1080, 1433, 1521, 1900, 2049, 3306, 3389, 54
 func (s *SSHSession) HandleGlobalRequest(GlobalRequest <-chan *ssh.Request) {
 	for req := range GlobalRequest {
 		switch req.Type {
-		case "shell", "pty-req", "window-change":
+		case "shell", "pty-req":
+			err := req.Reply(true, nil)
+			if err != nil {
+				log.Println("Failed to reply to request:", err)
+				return
+			}
+		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)
@@ -59,7 +79,6 @@ func (s *SSHSession) HandleTCPIPForward(req *ssh.Request) {
 	var rawPortToBind uint32
 	if err := binary.Read(reader, binary.BigEndian, &rawPortToBind); err != nil {
 		log.Println("Failed to read port from payload:", err)
-		s.interaction.SendMessage(fmt.Sprintf("Port %d is already in use or restricted. Please choose a different port. (02) \r\n", rawPortToBind))
 		err := req.Reply(false, nil)
 		if err != nil {
 			log.Println("Failed to reply to request:", err)
@@ -73,7 +92,7 @@ func (s *SSHSession) HandleTCPIPForward(req *ssh.Request) {
 	}
 
 	if rawPortToBind > 65535 {
-		s.interaction.SendMessage(fmt.Sprintf("Port %d is larger then allowed port of 65535. (02)\r\n", rawPortToBind))
+		log.Printf("Port %d is larger than allowed port of 65535", rawPortToBind)
 		err := req.Reply(false, nil)
 		if err != nil {
 			log.Println("Failed to reply to request:", err)
@@ -87,9 +106,8 @@ func (s *SSHSession) HandleTCPIPForward(req *ssh.Request) {
 	}
 
 	portToBind := uint16(rawPortToBind)
-
 	if isBlockedPort(portToBind) {
-		s.interaction.SendMessage(fmt.Sprintf("Port %d is already in use or restricted. Please choose a different port. (02)\r\n", portToBind))
+		log.Printf("Port %d is blocked or restricted", portToBind)
 		err := req.Reply(false, nil)
 		if err != nil {
 			log.Println("Failed to reply to request:", err)
@@ -105,25 +123,12 @@ func (s *SSHSession) HandleTCPIPForward(req *ssh.Request) {
 	if portToBind == 80 || portToBind == 443 {
 		s.HandleHTTPForward(req, portToBind)
 		return
-	} else {
+	}
-		if portToBind == 0 {
+	if portToBind == 0 {
-			unassign, success := portUtil.Default.GetUnassignedPort()
+		unassign, success := portUtil.Default.GetUnassignedPort()
-			portToBind = unassign
+		portToBind = unassign
-			if !success {
+		if !success {
-				s.interaction.SendMessage("No available port\r\n")
+			log.Println("No available port")
-				err := req.Reply(false, nil)
-				if err != nil {
-					log.Println("Failed to reply to request:", err)
-					return
-				}
-				err = s.lifecycle.Close()
-				if err != nil {
-					log.Printf("failed to close session: %v", err)
-				}
-				return
-			}
-		} else if isUse, isExist := portUtil.Default.GetPortStatus(portToBind); isExist && isUse {
-			s.interaction.SendMessage(fmt.Sprintf("Port %d is already in use or restricted. Please choose a different port. (03)\r\n", portToBind))
 			err := req.Reply(false, nil)
 			if err != nil {
 				log.Println("Failed to reply to request:", err)
@@ -135,26 +140,32 @@ func (s *SSHSession) HandleTCPIPForward(req *ssh.Request) {
 			}
 			return
 		}
-		err := portUtil.Default.SetPortStatus(portToBind, true)
+	} else if isUse, isExist := portUtil.Default.GetPortStatus(portToBind); isExist && isUse {
+		log.Printf("Port %d is already in use or restricted", portToBind)
+		err := req.Reply(false, nil)
 		if err != nil {
-			log.Println("Failed to set port status:", err)
+			log.Println("Failed to reply to request:", err)
 			return
 		}
+		err = s.lifecycle.Close()
+		if err != nil {
+			log.Printf("failed to close session: %v", err)
+		}
+		return
 	}
+	err = portUtil.Default.SetPortStatus(portToBind, true)
+	if err != nil {
+		log.Println("Failed to set port status:", err)
+		return
+	}
+
 	s.HandleTCPForward(req, addr, portToBind)
 }
 
 func (s *SSHSession) HandleHTTPForward(req *ssh.Request, portToBind uint16) {
-	slug := generateUniqueSlug()
+	slug := random.GenerateRandomString(20)
-	if slug == "" {
-		err := req.Reply(false, nil)
-		if err != nil {
-			log.Println("Failed to reply to request:", err)
-		}
-		return
-	}
 
-	if !registerClient(slug, s) {
+	if !s.registry.Register(slug, s) {
 		log.Printf("Failed to register client with slug: %s", slug)
 		err := req.Reply(false, nil)
 		if err != nil {
@@ -167,7 +178,7 @@ func (s *SSHSession) HandleHTTPForward(req *ssh.Request, portToBind uint16) {
 	err := binary.Write(buf, binary.BigEndian, uint32(portToBind))
 	if err != nil {
 		log.Println("Failed to write port to buffer:", err)
-		unregisterClient(slug)
+		s.registry.Remove(slug)
 		err = req.Reply(false, nil)
 		if err != nil {
 			log.Println("Failed to reply to request:", err)
@@ -176,16 +187,10 @@ func (s *SSHSession) HandleHTTPForward(req *ssh.Request, portToBind uint16) {
 	}
 	log.Printf("HTTP forwarding approved on port: %d", portToBind)
 
-	domain := utils.Getenv("DOMAIN", "localhost")
-	protocol := "http"
-	if utils.Getenv("TLS_ENABLED", "false") == "true" {
-		protocol = "https"
-	}
-
 	err = req.Reply(true, buf.Bytes())
 	if err != nil {
 		log.Println("Failed to reply to request:", err)
-		unregisterClient(slug)
+		s.registry.Remove(slug)
 		err = req.Reply(false, nil)
 		if err != nil {
 			log.Println("Failed to reply to request:", err)
@@ -196,18 +201,15 @@ func (s *SSHSession) HandleHTTPForward(req *ssh.Request, portToBind uint16) {
 	s.forwarder.SetType(types.HTTP)
 	s.forwarder.SetForwardedPort(portToBind)
 	s.slugManager.Set(slug)
-	s.interaction.SendMessage("\033[H\033[2J")
-	s.interaction.ShowWelcomeMessage()
-	s.interaction.SendMessage(fmt.Sprintf("Forwarding your traffic to %s://%s.%s\r\n", protocol, slug, domain))
 	s.lifecycle.SetStatus(types.RUNNING)
-	s.interaction.HandleUserInput()
+	s.interaction.Start()
 }
 
 func (s *SSHSession) HandleTCPForward(req *ssh.Request, addr string, portToBind uint16) {
 	log.Printf("Requested forwarding on %s:%d", addr, portToBind)
 	listener, err := net.Listen("tcp", fmt.Sprintf("0.0.0.0:%d", portToBind))
 	if err != nil {
-		s.interaction.SendMessage(fmt.Sprintf("Port %d is already in use or restricted. Please choose a different port.\r\n", portToBind))
+		log.Printf("Port %d is already in use or restricted", portToBind)
 		if setErr := portUtil.Default.SetPortStatus(portToBind, false); setErr != nil {
 			log.Printf("Failed to reset port status: %v", setErr)
 		}
@@ -256,31 +258,9 @@ func (s *SSHSession) HandleTCPForward(req *ssh.Request, addr string, portToBind
 	s.forwarder.SetType(types.TCP)
 	s.forwarder.SetListener(listener)
 	s.forwarder.SetForwardedPort(portToBind)
-	s.interaction.SendMessage("\033[H\033[2J")
-	s.interaction.ShowWelcomeMessage()
-	s.interaction.SendMessage(fmt.Sprintf("Forwarding your traffic to tcp://%s:%d \r\n", utils.Getenv("DOMAIN", "localhost"), s.forwarder.GetForwardedPort()))
 	s.lifecycle.SetStatus(types.RUNNING)
 	go s.forwarder.AcceptTCPConnections()
-	s.interaction.HandleUserInput()
+	s.interaction.Start()
-}
-
-func generateUniqueSlug() string {
-	maxAttempts := 5
-
-	for i := 0; i < maxAttempts; i++ {
-		slug := utils.GenerateRandomString(20)
-
-		clientsMutex.RLock()
-		_, exists := Clients[slug]
-		clientsMutex.RUnlock()
-
-		if !exists {
-			return slug
-		}
-	}
-
-	log.Println("Failed to generate unique slug after multiple attempts")
-	return ""
 }
 
 func readSSHString(reader *bytes.Reader) (string, error) {

session/interaction/constants.go

@@ -1,27 +0,0 @@
-package interaction
-
-const (
-	backspaceChar    = 8
-	deleteChar       = 127
-	enterChar        = 13
-	escapeChar       = 27
-	ctrlC            = 3
-	forwardSlash     = '/'
-	minPrintableChar = 32
-	maxPrintableChar = 126
-
-	minSlugLength = 3
-	maxSlugLength = 20
-
-	clearScreen    = "\033[H\033[2J"
-	clearLine      = "\033[K"
-	clearToLineEnd = "\r\033[K"
-	backspaceSeq   = "\b \b"
-
-	minBoxWidth  = 50
-	paddingRight = 4
-)
-
-var forbiddenSlugs = []string{
-	"ping",
-}

session/lifecycle/lifecycle.go

@@ -4,6 +4,8 @@ import (
 	"errors"
 	"io"
 	"net"
+	"time"
+
 	portUtil "tunnel_pls/internal/port"
 	"tunnel_pls/session/slug"
 	"tunnel_pls/types"
@@ -11,10 +13,6 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
-type Interaction interface {
-	SendMessage(string)
-}
-
 type Forwarder interface {
 	Close() error
 	GetTunnelType() types.TunnelType
@@ -25,21 +23,21 @@ type Lifecycle struct {
 	status           types.Status
 	conn             ssh.Conn
 	channel          ssh.Channel
-	interaction      Interaction
 	forwarder        Forwarder
 	slugManager      slug.Manager
 	unregisterClient func(slug string)
+	startedAt        time.Time
 }
 
-func NewLifecycle(conn ssh.Conn, interaction Interaction, forwarder Forwarder, slugManager slug.Manager) *Lifecycle {
+func NewLifecycle(conn ssh.Conn, forwarder Forwarder, slugManager slug.Manager) *Lifecycle {
 	return &Lifecycle{
-		status:           "",
+		status:           types.INITIALIZING,
 		conn:             conn,
 		channel:          nil,
-		interaction:      interaction,
 		forwarder:        forwarder,
 		slugManager:      slugManager,
 		unregisterClient: nil,
+		startedAt:        time.Now(),
 	}
 }
 
@@ -54,6 +52,8 @@ type SessionLifecycle interface {
 	GetChannel() ssh.Channel
 	SetChannel(channel ssh.Channel)
 	SetUnregisterClient(unregisterClient func(slug string))
+	IsActive() bool
+	StartedAt() time.Time
 }
 
 func (l *Lifecycle) GetChannel() ssh.Channel {
@@ -68,6 +68,9 @@ func (l *Lifecycle) GetConnection() ssh.Conn {
 }
 func (l *Lifecycle) SetStatus(status types.Status) {
 	l.status = status
+	if status == types.RUNNING && l.startedAt.IsZero() {
+		l.startedAt = time.Now()
+	}
 }
 
 func (l *Lifecycle) Close() error {
@@ -104,3 +107,11 @@ func (l *Lifecycle) Close() error {
 
 	return nil
 }
+
+func (l *Lifecycle) IsActive() bool {
+	return l.status == types.RUNNING
+}
+
+func (l *Lifecycle) StartedAt() time.Time {
+	return l.startedAt
+}

session/registry.go

@@ -0,0 +1,290 @@
+package session
+
+import (
+	"fmt"
+	"sync"
+)
+
+type Registry interface {
+	Get(slug string) (session *SSHSession, err error)
+	Update(oldSlug, newSlug string) error
+	Register(slug string, session *SSHSession) (success bool)
+	Remove(slug string)
+	GetAllSessionFromUser(user string) []*SSHSession
+}
+type registry struct {
+	mu        sync.RWMutex
+	byUser    map[string]map[string]*SSHSession
+	slugIndex map[string]string
+}
+
+func NewRegistry() Registry {
+	return &registry{
+		byUser:    make(map[string]map[string]*SSHSession),
+		slugIndex: make(map[string]string),
+	}
+}
+
+func (r *registry) Get(slug string) (session *SSHSession, err error) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	userID, ok := r.slugIndex[slug]
+	if !ok {
+		return nil, fmt.Errorf("session not found")
+	}
+
+	client, ok := r.byUser[userID][slug]
+	if !ok {
+		return nil, fmt.Errorf("session not found")
+	}
+	return client, nil
+}
+
+func (r *registry) Update(oldSlug, newSlug string) error {
+	if isForbiddenSlug(newSlug) {
+		return fmt.Errorf("this subdomain is reserved. Please choose a different one")
+	} else if !isValidSlug(newSlug) {
+		return fmt.Errorf("invalid subdomain. Follow the rules")
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	userID, ok := r.slugIndex[oldSlug]
+	if !ok {
+		return fmt.Errorf("session not found")
+	}
+
+	if _, exists := r.slugIndex[newSlug]; exists && newSlug != oldSlug {
+		return fmt.Errorf("someone already uses this subdomain")
+	}
+
+	client, ok := r.byUser[userID][oldSlug]
+	if !ok {
+		return fmt.Errorf("session not found")
+	}
+
+	delete(r.byUser[userID], oldSlug)
+	delete(r.slugIndex, oldSlug)
+
+	client.slugManager.Set(newSlug)
+	r.slugIndex[newSlug] = userID
+
+	if r.byUser[userID] == nil {
+		r.byUser[userID] = make(map[string]*SSHSession)
+	}
+	r.byUser[userID][newSlug] = client
+	return nil
+}
+
+func (r *registry) Register(slug string, session *SSHSession) (success bool) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if _, exists := r.slugIndex[slug]; exists {
+		return false
+	}
+
+	userID := session.userID
+	if r.byUser[userID] == nil {
+		r.byUser[userID] = make(map[string]*SSHSession)
+	}
+
+	r.byUser[userID][slug] = session
+	r.slugIndex[slug] = userID
+	return true
+}
+
+func (r *registry) GetAllSessionFromUser(user string) []*SSHSession {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+
+	m := r.byUser[user]
+	if len(m) == 0 {
+		return []*SSHSession{}
+	}
+
+	sessions := make([]*SSHSession, 0, len(m))
+	for _, s := range m {
+		sessions = append(sessions, s)
+	}
+	return sessions
+}
+
+func (r *registry) Remove(slug string) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	userID, ok := r.slugIndex[slug]
+	if !ok {
+		return
+	}
+
+	delete(r.byUser[userID], slug)
+	if len(r.byUser[userID]) == 0 {
+		delete(r.byUser, userID)
+	}
+	delete(r.slugIndex, slug)
+}
+
+func isValidSlug(slug string) bool {
+	if len(slug) < minSlugLength || len(slug) > maxSlugLength {
+		return false
+	}
+
+	if slug[0] == '-' || slug[len(slug)-1] == '-' {
+		return false
+	}
+
+	for _, c := range slug {
+		if !isValidSlugChar(byte(c)) {
+			return false
+		}
+	}
+
+	return true
+}
+
+func isValidSlugChar(c byte) bool {
+	return (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9') || c == '-'
+}
+
+func isForbiddenSlug(slug string) bool {
+	_, ok := forbiddenSlugs[slug]
+	return ok
+}
+
+var forbiddenSlugs = map[string]struct{}{
+	"ping":          {},
+	"staging":       {},
+	"admin":         {},
+	"root":          {},
+	"api":           {},
+	"www":           {},
+	"support":       {},
+	"help":          {},
+	"status":        {},
+	"health":        {},
+	"login":         {},
+	"logout":        {},
+	"signup":        {},
+	"register":      {},
+	"settings":      {},
+	"config":        {},
+	"null":          {},
+	"undefined":     {},
+	"example":       {},
+	"test":          {},
+	"dev":           {},
+	"system":        {},
+	"administrator": {},
+	"dashboard":     {},
+	"account":       {},
+	"profile":       {},
+	"user":          {},
+	"users":         {},
+	"auth":          {},
+	"oauth":         {},
+	"callback":      {},
+	"webhook":       {},
+	"webhooks":      {},
+	"static":        {},
+	"assets":        {},
+	"cdn":           {},
+	"mail":          {},
+	"email":         {},
+	"ftp":           {},
+	"ssh":           {},
+	"git":           {},
+	"svn":           {},
+	"blog":          {},
+	"news":          {},
+	"about":         {},
+	"contact":       {},
+	"terms":         {},
+	"privacy":       {},
+	"legal":         {},
+	"billing":       {},
+	"payment":       {},
+	"checkout":      {},
+	"cart":          {},
+	"shop":          {},
+	"store":         {},
+	"download":      {},
+	"uploads":       {},
+	"images":        {},
+	"img":           {},
+	"css":           {},
+	"js":            {},
+	"fonts":         {},
+	"public":        {},
+	"private":       {},
+	"internal":      {},
+	"external":      {},
+	"proxy":         {},
+	"cache":         {},
+	"debug":         {},
+	"metrics":       {},
+	"monitoring":    {},
+	"graphql":       {},
+	"rest":          {},
+	"rpc":           {},
+	"socket":        {},
+	"ws":            {},
+	"wss":           {},
+	"app":           {},
+	"apps":          {},
+	"mobile":        {},
+	"desktop":       {},
+	"embed":         {},
+	"widget":        {},
+	"docs":          {},
+	"documentation": {},
+	"wiki":          {},
+	"forum":         {},
+	"community":     {},
+	"feedback":      {},
+	"report":        {},
+	"abuse":         {},
+	"spam":          {},
+	"security":      {},
+	"verify":        {},
+	"confirm":       {},
+	"reset":         {},
+	"password":      {},
+	"recovery":      {},
+	"unsubscribe":   {},
+	"subscribe":     {},
+	"notifications": {},
+	"alerts":        {},
+	"messages":      {},
+	"inbox":         {},
+	"outbox":        {},
+	"sent":          {},
+	"draft":         {},
+	"trash":         {},
+	"archive":       {},
+	"search":        {},
+	"explore":       {},
+	"discover":      {},
+	"trending":      {},
+	"popular":       {},
+	"featured":      {},
+	"new":           {},
+	"latest":        {},
+	"top":           {},
+	"best":          {},
+	"hot":           {},
+	"random":        {},
+	"all":           {},
+	"any":           {},
+	"none":          {},
+	"true":          {},
+	"false":         {},
+}
+
+var (
+	minSlugLength = 3
+	maxSlugLength = 20
+)

session/session.go

@@ -3,22 +3,16 @@ package session
 import (
 	"fmt"
 	"log"
-	"sync"
 	"time"
+	"tunnel_pls/internal/config"
 	"tunnel_pls/session/forwarder"
 	"tunnel_pls/session/interaction"
 	"tunnel_pls/session/lifecycle"
 	"tunnel_pls/session/slug"
-	"tunnel_pls/utils"
 
 	"golang.org/x/crypto/ssh"
 )
 
-var (
-	clientsMutex sync.RWMutex
-	Clients      = make(map[string]*SSHSession)
-)
-
 type Session interface {
 	HandleGlobalRequest(ch <-chan *ssh.Request)
 	HandleTCPIPForward(req *ssh.Request)
@@ -27,10 +21,14 @@ type Session interface {
 }
 
 type SSHSession struct {
-	lifecycle   lifecycle.SessionLifecycle
+	initialReq    <-chan *ssh.Request
-	interaction interaction.Controller
+	sshReqChannel <-chan ssh.NewChannel
-	forwarder   forwarder.ForwardingController
+	lifecycle     lifecycle.SessionLifecycle
-	slugManager slug.Manager
+	interaction   interaction.Controller
+	forwarder     forwarder.ForwardingController
+	slugManager   slug.Manager
+	registry      Registry
+	userID        string
 }
 
 func (s *SSHSession) GetLifecycle() lifecycle.SessionLifecycle {
@@ -49,55 +47,83 @@ func (s *SSHSession) GetSlugManager() slug.Manager {
 	return s.slugManager
 }
 
-func New(conn *ssh.ServerConn, forwardingReq <-chan *ssh.Request, sshChan <-chan ssh.NewChannel) {
+func New(conn *ssh.ServerConn, forwardingReq <-chan *ssh.Request, sshChan <-chan ssh.NewChannel, sessionRegistry Registry, userID string) *SSHSession {
 	slugManager := slug.NewManager()
 	forwarderManager := forwarder.NewForwarder(slugManager)
 	interactionManager := interaction.NewInteraction(slugManager, forwarderManager)
-	lifecycleManager := lifecycle.NewLifecycle(conn, interactionManager, forwarderManager, slugManager)
+	lifecycleManager := lifecycle.NewLifecycle(conn, forwarderManager, slugManager)
 
 	interactionManager.SetLifecycle(lifecycleManager)
-	interactionManager.SetSlugModificator(updateClientSlug)
+	interactionManager.SetSlugModificator(sessionRegistry.Update)
 	forwarderManager.SetLifecycle(lifecycleManager)
-	lifecycleManager.SetUnregisterClient(unregisterClient)
+	lifecycleManager.SetUnregisterClient(sessionRegistry.Remove)
 
-	session := &SSHSession{
+	return &SSHSession{
-		lifecycle:   lifecycleManager,
+		initialReq:    forwardingReq,
-		interaction: interactionManager,
+		sshReqChannel: sshChan,
-		forwarder:   forwarderManager,
+		lifecycle:     lifecycleManager,
-		slugManager: slugManager,
+		interaction:   interactionManager,
-	}
+		forwarder:     forwarderManager,
-
+		slugManager:   slugManager,
-	var once sync.Once
+		registry:      sessionRegistry,
-	for channel := range sshChan {
+		userID:        userID,
-		ch, reqs, err := channel.Accept()
-		if err != nil {
-			log.Printf("failed to accept channel: %v", err)
-			continue
-		}
-		once.Do(func() {
-			session.lifecycle.SetChannel(ch)
-			session.interaction.SetChannel(ch)
-
-			tcpipReq := session.waitForTCPIPForward(forwardingReq)
-			if tcpipReq == nil {
-				session.interaction.SendMessage(fmt.Sprintf("Port forwarding request not received.\r\nEnsure you ran the correct command with -R flag.\r\nExample: ssh %s -p %s -R 80:localhost:3000\r\nFor more details, visit https://tunnl.live.\r\n\r\n", utils.Getenv("DOMAIN", "localhost"), utils.Getenv("PORT", "2200")))
-				if err := session.lifecycle.Close(); err != nil {
-					log.Printf("failed to close session: %v", err)
-				}
-				return
-			}
-			session.HandleTCPIPForward(tcpipReq)
-		})
-		go session.HandleGlobalRequest(reqs)
-	}
-	if err := session.lifecycle.Close(); err != nil {
-		log.Printf("failed to close session: %v", err)
 	}
 }
 
-func (s *SSHSession) waitForTCPIPForward(forwardingReq <-chan *ssh.Request) *ssh.Request {
+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"`
+}
+
+func (s *SSHSession) Detail() Detail {
+	return Detail{
+		ForwardingType: string(s.forwarder.GetTunnelType()),
+		Slug:           s.slugManager.Get(),
+		UserID:         s.userID,
+		Active:         s.lifecycle.IsActive(),
+		StartedAt:      s.lifecycle.StartedAt(),
+	}
+}
+
+func (s *SSHSession) Start() error {
+	channel := <-s.sshReqChannel
+	ch, reqs, err := channel.Accept()
+	if err != nil {
+		log.Printf("failed to accept channel: %v", err)
+		return err
+	}
+	go s.HandleGlobalRequest(reqs)
+
+	tcpipReq := s.waitForTCPIPForward()
+	if tcpipReq == nil {
+		_, err := ch.Write([]byte(fmt.Sprintf("Port 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")
+	}
+
+	s.lifecycle.SetChannel(ch)
+	s.interaction.SetChannel(ch)
+
+	s.HandleTCPIPForward(tcpipReq)
+
+	if err := s.lifecycle.Close(); err != nil {
+		log.Printf("failed to close session: %v", err)
+		return err
+	}
+	return nil
+}
+
+func (s *SSHSession) waitForTCPIPForward() *ssh.Request {
 	select {
-	case req, ok := <-forwardingReq:
+	case req, ok := <-s.initialReq:
 		if !ok {
 			log.Println("Forwarding request channel closed")
 			return nil
@@ -115,41 +141,3 @@ func (s *SSHSession) waitForTCPIPForward(forwardingReq <-chan *ssh.Request) *ssh
 		return nil
 	}
 }
-
-func updateClientSlug(oldSlug, newSlug string) bool {
-	clientsMutex.Lock()
-	defer clientsMutex.Unlock()
-
-	if _, exists := Clients[newSlug]; exists && newSlug != oldSlug {
-		return false
-	}
-
-	client, ok := Clients[oldSlug]
-	if !ok {
-		return false
-	}
-
-	delete(Clients, oldSlug)
-	client.slugManager.Set(newSlug)
-	Clients[newSlug] = client
-	return true
-}
-
-func registerClient(slug string, session *SSHSession) bool {
-	clientsMutex.Lock()
-	defer clientsMutex.Unlock()
-
-	if _, exists := Clients[slug]; exists {
-		return false
-	}
-
-	Clients[slug] = session
-	return true
-}
-
-func unregisterClient(slug string) {
-	clientsMutex.Lock()
-	defer clientsMutex.Unlock()
-
-	delete(Clients, slug)
-}

session/slug/slug.go

@@ -1,32 +1,24 @@
 package slug
 
-import "sync"
-
 type Manager interface {
 	Get() string
 	Set(slug string)
 }
 
 type manager struct {
-	slug   string
+	slug string
-	slugMu sync.RWMutex
 }
 
 func NewManager() Manager {
 	return &manager{
-		slug:   "",
+		slug: "",
-		slugMu: sync.RWMutex{},
 	}
 }
 
 func (s *manager) Get() string {
-	s.slugMu.RLock()
-	defer s.slugMu.RUnlock()
 	return s.slug
 }
 
 func (s *manager) Set(slug string) {
-	s.slugMu.Lock()
 	s.slug = slug
-	s.slugMu.Unlock()
 }

types/types.go

@@ -15,12 +15,6 @@ const (
 	TCP  TunnelType = "TCP"
 )
 
-type InteractionType string
-
-const (
-	Slug InteractionType = "SLUG"
-)
-
 var BadGatewayResponse = []byte("HTTP/1.1 502 Bad Gateway\r\n" +
 	"Content-Length: 11\r\n" +
 	"Content-Type: text/plain\r\n\r\n" +

version/version.go

@@ -0,0 +1,17 @@
+package version
+
+import "fmt"
+
+var (
+	Version   = "dev"
+	BuildDate = "unknown"
+	Commit    = "unknown"
+)
+
+func GetVersion() string {
+	return fmt.Sprintf("tunnel_pls %s (commit: %s, built: %s)", Version, Commit, BuildDate)
+}
+
+func GetShortVersion() string {
+	return Version
+}