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This commit is contained in:
Evan Reichard 2025-09-19 14:59:07 -04:00
commit 5bb9052fa4
15 changed files with 937 additions and 0 deletions
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6
.golangci.toml Normal file
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#:schema https://golangci-lint.run/jsonschema/golangci.jsonschema.json
version = "2"
[[linters.exclusions.rules]]
linters = [ "errcheck" ]
source = "^\\s*defer\\s+"

159
client/client.go Normal file
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package client
import (
"fmt"
"net"
"net/url"
"sync"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
"reichard.io/conduit/config"
"reichard.io/conduit/types"
)
func NewTunnel(cfg *config.ClientConfig) (*Tunnel, error) {
// Parse Server URL
serverURL, err := url.Parse(cfg.ServerAddress)
if err != nil {
return nil, err
}
// Parse Scheme
var wsScheme string
switch serverURL.Scheme {
case "https":
wsScheme = "wss"
case "http":
wsScheme = "ws"
default:
return nil, fmt.Errorf("unsupported scheme: %s", serverURL.Scheme)
}
// Create Tunnel Name
if cfg.TunnelName == "" {
cfg.TunnelName = generateTunnelName()
log.Infof("tunnel name not provided; generated: %s", cfg.TunnelName)
}
// Connect Server WS
wsURL := fmt.Sprintf("%s://%s/_conduit/tunnel?tunnelName=%s&apiKey=%s", wsScheme, serverURL.Host, cfg.TunnelName, cfg.APIKey)
serverConn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
if err != nil {
return nil, fmt.Errorf("failed to connect: %v", err)
}
return &Tunnel{
name: cfg.TunnelName,
target: cfg.TunnelTarget,
serverURL: serverURL,
serverConn: serverConn,
localConns: make(map[string]net.Conn),
}, nil
}
type Tunnel struct {
name string
target string
serverURL *url.URL
serverConn *websocket.Conn
localConns map[string]net.Conn
mu sync.RWMutex
}
func (t *Tunnel) Start() error {
log.Infof("starting tunnel: %s.%s -> %s\n", t.name, t.serverURL.Hostname(), t.target)
defer t.serverConn.Close()
// Handle Messages
for {
// Read Message
var msg types.Message
err := t.serverConn.ReadJSON(&msg)
if err != nil {
log.Errorf("error reading from tunnel: %v", err)
break
}
switch msg.Type {
case types.MessageTypeData:
localConn, err := t.getLocalConn(msg.StreamID)
if err != nil {
log.Errorf("failed to get local connection: %v", err)
continue
}
// Write data to local connection
if _, err := localConn.Write(msg.Data); err != nil {
log.Errorf("error writing to local connection: %v", err)
localConn.Close()
t.mu.Lock()
delete(t.localConns, msg.StreamID)
t.mu.Unlock()
}
case types.MessageTypeClose:
t.mu.Lock()
if localConn, exists := t.localConns[msg.StreamID]; exists {
localConn.Close()
delete(t.localConns, msg.StreamID)
}
t.mu.Unlock()
}
}
return nil
}
func (t *Tunnel) getLocalConn(streamID string) (net.Conn, error) {
// Get Cached Connection
t.mu.RLock()
localConn, exists := t.localConns[streamID]
t.mu.RUnlock()
if exists {
return localConn, nil
}
// Initiate Connection & Cache
localConn, err := net.Dial("tcp", t.target)
if err != nil {
log.Errorf("failed to connect to %s: %v", t.target, err)
return nil, err
}
t.mu.Lock()
t.localConns[streamID] = localConn
t.mu.Unlock()
// Start Response Relay & Return Connection
go t.startResponseRelay(streamID, localConn)
return localConn, nil
}
func (t *Tunnel) startResponseRelay(streamID string, localConn net.Conn) {
defer func() {
t.mu.Lock()
delete(t.localConns, streamID)
t.mu.Unlock()
localConn.Close()
}()
buffer := make([]byte, 4096)
for {
n, err := localConn.Read(buffer)
if err != nil {
break
}
response := types.Message{
Type: types.MessageTypeData,
StreamID: streamID,
Data: buffer[:n],
}
if err := t.serverConn.WriteJSON(response); err != nil {
break
}
}
}

23
client/name.go Normal file
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package client
import (
"fmt"
"math/rand"
)
var colors = []string{
"red", "blue", "green", "yellow", "purple", "orange",
"pink", "brown", "black", "white", "gray", "cyan",
}
var animals = []string{
"cat", "dog", "bird", "fish", "lion", "tiger",
"bear", "wolf", "fox", "deer", "rabbit", "mouse",
}
func generateTunnelName() string {
color := colors[rand.Intn(len(colors))]
animal := animals[rand.Intn(len(animals))]
number := rand.Intn(900) + 100
return fmt.Sprintf("%s-%s-%d", color, animal, number)
}

39
cmd/link.go Normal file
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package cmd
import (
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"reichard.io/conduit/client"
"reichard.io/conduit/config"
)
var linkCmd = &cobra.Command{
Use: "link <name> <host:port>",
Short: "Create a conduit tunnel",
Run: func(cmd *cobra.Command, args []string) {
// Get Client Config
cfg, err := config.GetClientConfig(cmd.Flags())
if err != nil {
log.Fatal("failed to get client config:", err)
}
// Create Tunnel
tunnel, err := client.NewTunnel(cfg)
if err != nil {
log.Fatal("failed to create tunnel:", err)
}
// Start Tunnel
log.Infof("creating TCP tunnel: %s -> %s", cfg.TunnelName, cfg.TunnelTarget)
if err := tunnel.Start(); err != nil {
log.Fatal("failed to start tunnel:", err)
}
},
}
func init() {
configDefs := config.GetConfigDefs[config.ClientConfig]()
for _, d := range configDefs {
linkCmd.Flags().String(d.Key, d.Default, d.Description)
}
}

26
cmd/root.go Normal file
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package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
)
var rootCmd = &cobra.Command{
Use: "conduit",
Short: "A tunneling service similar to ngrok",
Long: `Conduit allows you to expose local services through secure tunnels`,
}
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func init() {
rootCmd.AddCommand(serveCmd)
rootCmd.AddCommand(linkCmd)
}

40
cmd/serve.go Normal file
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package cmd
import (
"reichard.io/conduit/config"
"reichard.io/conduit/server"
log "github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
var serveCmd = &cobra.Command{
Use: "serve",
Short: "Start the conduit server",
Long: `Start the conduit server to handle incoming tunnel requests`,
Run: func(cmd *cobra.Command, args []string) {
// Get Server Config
cfg, err := config.GetServerConfig(cmd.Flags())
if err != nil {
log.Fatal("failed to get server config:", err)
}
// Create Server
srv, err := server.NewServer(cfg)
if err != nil {
log.Fatal("failed to create server:", err)
}
// Start Server
if err := srv.Start(); err != nil {
log.Fatal("failed to start server:", err)
}
},
}
func init() {
configDefs := config.GetConfigDefs[config.ServerConfig]()
for _, d := range configDefs {
serveCmd.Flags().String(d.Key, d.Default, d.Description)
}
}

153
config/config.go Normal file
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package config
import (
"errors"
"fmt"
"net/url"
"os"
"reflect"
"strings"
"github.com/spf13/pflag"
)
type ConfigDef struct {
Key string
Env string
Default string
Description string
}
type BaseConfig struct {
ServerAddress string `json:"server" description:"Conduit server address" default:"http://localhost:8080"`
APIKey string `json:"api_key" description:"API Key for the conduit API"`
}
func (c *BaseConfig) Validate() error {
if c.APIKey == "" {
return errors.New("api_key is required")
}
if c.ServerAddress == "" {
return errors.New("server is required")
}
if _, err := url.Parse(c.ServerAddress); err != nil {
return fmt.Errorf("server is invalid: %w", err)
}
return nil
}
type ServerConfig struct {
BaseConfig
BindAddress string `json:"bind" default:"0.0.0.0:8080" description:"Address the conduit server listens on"`
}
type ClientConfig struct {
BaseConfig
TunnelName string `json:"name" description:"Tunnel name"`
TunnelTarget string `json:"target" description:"Tunnel target address"`
}
func (c *ClientConfig) Validate() error {
if err := c.BaseConfig.Validate(); err != nil {
return err
}
if c.TunnelTarget == "" {
return fmt.Errorf("target is required")
}
return nil
}
func GetServerConfig(cmdFlags *pflag.FlagSet) (*ServerConfig, error) {
defs := GetConfigDefs[ServerConfig]()
cfgValues := make(map[string]string)
for _, def := range defs {
cfgValues[def.Key] = getConfigValue(cmdFlags, def)
}
cfg := &ServerConfig{
BaseConfig: BaseConfig{
ServerAddress: cfgValues["server"],
APIKey: cfgValues["api_key"],
},
BindAddress: cfgValues["bind"],
}
return cfg, cfg.Validate()
}
func GetClientConfig(cmdFlags *pflag.FlagSet) (*ClientConfig, error) {
defs := GetConfigDefs[ClientConfig]()
cfgValues := make(map[string]string)
for _, def := range defs {
cfgValues[def.Key] = getConfigValue(cmdFlags, def)
}
cfg := &ClientConfig{
BaseConfig: BaseConfig{
ServerAddress: cfgValues["server"],
APIKey: cfgValues["api_key"],
},
TunnelName: cfgValues["name"],
TunnelTarget: cfgValues["target"],
}
return cfg, cfg.Validate()
}
func GetConfigDefs[T ServerConfig | ClientConfig]() []ConfigDef {
var defs []ConfigDef
processFields(reflect.TypeFor[T](), &defs)
return defs
}
func getConfigValue(cmdFlags *pflag.FlagSet, def ConfigDef) string {
// 1. Get Flags First
if cmdFlags != nil {
if val, err := cmdFlags.GetString(def.Key); err == nil && val != "" {
return val
}
}
// 2. Environment Variables Next
if envVal := os.Getenv(def.Env); envVal != "" {
return envVal
}
// 3. Defaults Last
return def.Default
}
func processFields(t reflect.Type, defs *[]ConfigDef) {
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
// Process Embedded (BaseConfig)
if field.Anonymous {
processFields(field.Type, defs)
continue
}
// Extract Struct Tags
jsonTag := field.Tag.Get("json")
defaultTag := field.Tag.Get("default")
descriptionTag := field.Tag.Get("description")
// Skip JSON Fields
if jsonTag == "" {
continue
}
// Get Key & Env
key := strings.Split(jsonTag, ",")[0]
env := "CONDUIT_" + strings.ToUpper(key)
*defs = append(*defs, ConfigDef{
Key: key,
Env: env,
Default: defaultTag,
Description: descriptionTag,
})
}
}

61
flake.lock generated Normal file
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{
"nodes": {
"flake-utils": {
"inputs": {
"systems": "systems"
},
"locked": {
"lastModified": 1731533236,
"narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
"owner": "numtide",
"repo": "flake-utils",
"rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
"type": "github"
},
"original": {
"owner": "numtide",
"repo": "flake-utils",
"type": "github"
}
},
"nixpkgs": {
"locked": {
"lastModified": 1758216857,
"narHash": "sha256-h1BW2y7CY4LI9w61R02wPaOYfmYo82FyRqHIwukQ6SY=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "d2ed99647a4b195f0bcc440f76edfa10aeb3b743",
"type": "github"
},
"original": {
"owner": "NixOS",
"ref": "nixos-25.05",
"repo": "nixpkgs",
"type": "github"
}
},
"root": {
"inputs": {
"flake-utils": "flake-utils",
"nixpkgs": "nixpkgs"
}
},
"systems": {
"locked": {
"lastModified": 1681028828,
"narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
"owner": "nix-systems",
"repo": "default",
"rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
"type": "github"
},
"original": {
"owner": "nix-systems",
"repo": "default",
"type": "github"
}
}
},
"root": "root",
"version": 7
}

26
flake.nix Normal file
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{
description = "Development Environment";
inputs = {
nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
flake-utils.url = "github:numtide/flake-utils";
};
outputs = { self, nixpkgs, flake-utils }:
flake-utils.lib.eachDefaultSystem (system:
let
pkgs = nixpkgs.legacyPackages.${system};
in
{
devShells.default = pkgs.mkShell {
packages = with pkgs; [
go
golangci-lint
];
shellHook = ''
export PATH=$PATH:~/go/bin
'';
};
}
);
}

12
go.mod Normal file
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module reichard.io/conduit
go 1.24.4
require (
github.com/gorilla/websocket v1.5.3 // indirect
github.com/inconshreveable/mousetrap v1.1.0 // indirect
github.com/sirupsen/logrus v1.9.3 // indirect
github.com/spf13/cobra v1.10.1 // indirect
github.com/spf13/pflag v1.0.9 // indirect
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
)

22
go.sum Normal file
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github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
github.com/spf13/cobra v1.10.1 h1:lJeBwCfmrnXthfAupyUTzJ/J4Nc1RsHC/mSRU2dll/s=
github.com/spf13/cobra v1.10.1/go.mod h1:7SmJGaTHFVBY0jW4NXGluQoLvhqFQM+6XSKD+P4XaB0=
github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 h1:0A+M6Uqn+Eje4kHMK80dtF3JCXC4ykBgQG4Fe06QRhQ=
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

7
main.go Normal file
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package main
import "reichard.io/conduit/cmd"
func main() {
cmd.Execute()
}

301
server/server.go Normal file
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package server
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
log "github.com/sirupsen/logrus"
"reichard.io/conduit/config"
"reichard.io/conduit/types"
)
type TunnelConnection struct {
*websocket.Conn
name string
streams map[string]chan []byte
}
type Server struct {
host string
cfg *config.ServerConfig
mu sync.RWMutex
upgrader websocket.Upgrader
tunnels map[string]*TunnelConnection
}
func NewServer(cfg *config.ServerConfig) (*Server, error) {
serverURL, err := url.Parse(cfg.ServerAddress)
if err != nil {
return nil, fmt.Errorf("failed to parse server address: %v", err)
} else if serverURL.Host == "" {
return nil, errors.New("invalid server address")
}
return &Server{
cfg: cfg,
host: serverURL.Host,
tunnels: make(map[string]*TunnelConnection),
upgrader: websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool {
return true
},
},
}, nil
}
func (s *Server) Start() error {
// Raw TCP Listener - This is necessary so we can conditionally either relay
// the raw TCP connection, or handle conduit control server API requests.
listener, err := net.Listen("tcp", s.cfg.BindAddress)
if err != nil {
return err
}
defer listener.Close()
// Start Listening
log.Infof("conduit server listening on %s", s.cfg.BindAddress)
for {
conn, err := listener.Accept()
if err != nil {
log.Printf("error accepting connection: %v", err)
continue
}
go s.handleRawConnection(conn)
}
}
func (s *Server) getStatus(w http.ResponseWriter, _ *http.Request) {
s.mu.RLock()
count := len(s.tunnels)
s.mu.RUnlock()
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(200)
response := fmt.Sprintf(`{"tunnels": %d}`, count)
_, _ = w.Write([]byte(response))
}
func (s *Server) proxyRawConnection(clientConn net.Conn, tunnelConn *TunnelConnection, dataReader io.Reader) {
defer clientConn.Close()
// Create Identifiers
streamID := fmt.Sprintf("stream_%d", time.Now().UnixNano())
responseChan := make(chan []byte, 100)
// Register Stream
s.mu.Lock()
if tunnelConn.streams == nil {
tunnelConn.streams = make(map[string]chan []byte)
}
tunnelConn.streams[streamID] = responseChan
s.mu.Unlock()
// Clean Up
defer func() {
s.mu.Lock()
delete(tunnelConn.streams, streamID)
close(responseChan)
s.mu.Unlock()
// Send Close
closeMsg := types.Message{
Type: types.MessageTypeClose,
StreamID: streamID,
}
_ = tunnelConn.WriteJSON(closeMsg)
}()
// Read & Send Chunks
go func() {
buffer := make([]byte, 4096)
for {
n, err := dataReader.Read(buffer)
if err != nil {
return
}
if err := tunnelConn.WriteJSON(types.Message{
Type: types.MessageTypeData,
StreamID: streamID,
Data: buffer[:n],
}); err != nil {
return
}
}
}()
// Return Response Data
for data := range responseChan {
if _, err := clientConn.Write(data); err != nil {
break
}
}
}
func (s *Server) handleRawConnection(conn net.Conn) {
defer conn.Close()
// Capture Consumed Data - When determining where to route the request, we
// have to read the host headers. This requires reading from the buffer, so
// if we later decide to tunnel the TCP connection we need to reconstruct the
// data from the buffer.
var capturedData bytes.Buffer
teeReader := io.TeeReader(conn, &capturedData)
bufReader := bufio.NewReader(teeReader)
// Create HTTP Request & Writer
w := &connResponseWriter{conn: conn}
r, err := http.ReadRequest(bufReader)
if err != nil {
w.WriteHeader(http.StatusBadRequest)
return
}
defer r.Body.Close()
// Validate Host
if !strings.Contains(r.Host, s.host) {
w.WriteHeader(http.StatusBadRequest)
_, _ = fmt.Fprintf(w, "unknown host: %s", r.Host)
return
}
// Extract Subdomain
subdomain := strings.TrimSuffix(strings.Replace(r.Host, s.host, "", 1), ".")
if strings.Count(subdomain, ".") != 0 {
w.WriteHeader(http.StatusBadRequest)
_, _ = fmt.Fprintf(w, "cannot tunnel nested subdomains: %s", r.Host)
return
}
// Handle Control Endpoints
if subdomain == "" {
s.handleAsHTTP(w, r)
return
}
// Handle Tunnels
s.mu.RLock()
tunnelConn, exists := s.tunnels[subdomain]
s.mu.RUnlock()
if exists {
log.Infof("relaying %s to tunnel", subdomain)
// Reconstruct Data & Proxy Connection
allReader := io.MultiReader(&capturedData, r.Body)
s.proxyRawConnection(conn, tunnelConn, allReader)
}
}
func (s *Server) handleAsHTTP(w http.ResponseWriter, r *http.Request) {
// Authorize Control Endpoints
apiKey := r.URL.Query().Get("apiKey")
if apiKey != s.cfg.APIKey {
log.Error("unauthorized client")
w.WriteHeader(http.StatusUnauthorized)
return
}
// Handle Control Endpoints
switch r.URL.Path {
case "/_conduit/tunnel":
s.createTunnel(w, r)
case "/_conduit/status":
s.getStatus(w, r)
default:
w.WriteHeader(http.StatusNotFound)
}
}
func (s *Server) handleTunnelMessages(tunnel *TunnelConnection) {
for {
var msg types.Message
err := tunnel.ReadJSON(&msg)
if err != nil {
return
}
if msg.StreamID == "" {
log.Infof("tunnel %s missing streamID", tunnel.name)
continue
}
switch msg.Type {
case types.MessageTypeClose:
return
case types.MessageTypeData:
s.mu.RLock()
streamChan, exists := tunnel.streams[msg.StreamID]
if !exists {
log.Infof("stream %s does not exist", msg.StreamID)
s.mu.RUnlock()
continue
}
select {
case streamChan <- msg.Data:
case <-time.After(time.Second):
log.Warnf("stream %s channel full, dropping data", msg.StreamID)
}
s.mu.RUnlock()
}
}
}
func (s *Server) createTunnel(w http.ResponseWriter, r *http.Request) {
// Get Tunnel Name
tunnelName := r.URL.Query().Get("tunnelName")
if tunnelName == "" {
w.WriteHeader(http.StatusBadRequest)
_, _ = w.Write([]byte("Missing tunnelName parameter"))
return
}
// Validate Unique
if _, exists := s.tunnels[tunnelName]; exists {
w.WriteHeader(http.StatusConflict)
_, _ = w.Write([]byte("Tunnel already registered"))
return
}
// Upgrade Connection
wsConn, err := s.upgrader.Upgrade(w, r, nil)
if err != nil {
log.Errorf("websocket upgrade failed: %v", err)
return
}
// Create & Cache TunnelConnection
tunnel := &TunnelConnection{
Conn: wsConn,
name: tunnelName,
streams: make(map[string]chan []byte),
}
s.mu.Lock()
s.tunnels[tunnelName] = tunnel
s.mu.Unlock()
log.Infof("tunnel established: %s", tunnelName)
// Keep connection alive and handle cleanup
defer func() {
s.mu.Lock()
delete(s.tunnels, tunnelName)
s.mu.Unlock()
_ = wsConn.Close()
log.Infof("tunnel closed: %s", tunnelName)
}()
// Handle tunnel messages
s.handleTunnelMessages(tunnel)
}

48
server/writer.go Normal file
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@ -0,0 +1,48 @@
package server
import (
"bufio"
"fmt"
"net"
"net/http"
)
var _ http.ResponseWriter = (*connResponseWriter)(nil)
type connResponseWriter struct {
conn net.Conn
header http.Header
}
func (f *connResponseWriter) Header() http.Header {
if f.header == nil {
f.header = make(http.Header)
}
return f.header
}
func (f *connResponseWriter) Write(data []byte) (int, error) {
return f.conn.Write(data)
}
func (f *connResponseWriter) WriteHeader(statusCode int) {
// Write Status
status := fmt.Sprintf("HTTP/1.1 %d %s\r\n", statusCode, http.StatusText(statusCode))
_, _ = f.conn.Write([]byte(status))
// Write Headers
for key, values := range f.header {
for _, value := range values {
_, _ = fmt.Fprintf(f.conn, "%s: %s\r\n", key, value)
}
}
// End Headers
_, _ = f.conn.Write([]byte("\r\n"))
}
func (f *connResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
// Return Raw Connection & ReadWriter
rw := bufio.NewReadWriter(bufio.NewReader(f.conn), bufio.NewWriter(f.conn))
return f.conn, rw, nil
}

14
types/message.go Normal file
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@ -0,0 +1,14 @@
package types
type MessageType string
const (
MessageTypeData MessageType = "data"
MessageTypeClose MessageType = "close"
)
type Message struct {
Type MessageType `json:"type"`
StreamID string `json:"stream_id"`
Data []byte `json:"data,omitempty"`
}