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4 Commits
481f8c431d ... main

Author SHA1 Message Date
Jose Luis Montañes Ojados
736922ca77 Rename internal asset path to /_gw/ to avoid collision with user apps 2026-01-27 03:16:08 +01:00
Jose Luis Montañes Ojados
8e473a5bae Fix syntax error and restore missing methods in client 2026-01-27 03:07:10 +01:00
Jose Luis Montañes Ojados
310d7e086c Add client support for HTTPS forwarding and custom Host headers 2026-01-27 03:05:09 +01:00
Jose Luis Montañes Ojados
b5f6f42311 feat: Implement initial client application with TUI for SSH tunnel management and monitoring. 2026-01-27 03:03:21 +01:00
5 changed files with 97 additions and 29 deletions
Expand all files Collapse all files

4
cmd/client/main.go
View File

@@ -35,6 +35,8 @@ func main() {
localPort := flag.String("local", "8080", "Local port to expose")
serverAddrFlag := flag.String("server", "", "Grokway server address")
tokenFlag := flag.String("token", "", "Authentication token (overrides config)")
hostHeaderFlag := flag.String("host-header", "", "Custom Host header to send to local service")
localHttpsFlag := flag.Bool("local-https", false, "Use HTTPS to connect to local service (implied if port is 443)")
flag.Parse()
// Load config
@@ -56,7 +58,7 @@ func main() {
serverAddr = "localhost:2222"
}
m := tui.InitialModel(*localPort, serverAddr, authToken)
m := tui.InitialModel(*localPort, serverAddr, authToken, *hostHeaderFlag, *localHttpsFlag)
p := tea.NewProgram(m, tea.WithAltScreen())
if _, err := p.Run(); err != nil {

5
cmd/server/main.go
View File

@@ -76,9 +76,8 @@ func (tm *TunnelManager) FindSlugByConn(conn *gossh.ServerConn) (string, bool) {
// HTTP Proxy to forward requests to the SSH tunnel
func startHttpProxy(port string) {
log.Printf("Starting HTTP Proxy on %s", port)
// Serve static files for 404 page
http.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("./cmd/server/static/assets"))))
// Serve static files for 404 page (namespaced to avoid collision with user apps)
http.Handle("/_gw/", http.StripPrefix("/_gw/", http.FileServer(http.Dir("./cmd/server/static/assets"))))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// Extract subdomain to identify the tunnel

6
cmd/server/static/404.html
View File

@@ -16,11 +16,11 @@
<link
rel="stylesheet"
id="a3a3_lazy_load-css"
href="./assets/a3_lazy_load.min.css"
href="/_gw/a3_lazy_load.min.css"
type="text/css"
media="all"
/>
<link rel="stylesheet" href="assets/style.css">
<link rel="stylesheet" href="/_gw/style.css">
</head>
<body>
<section class="error_404">
@@ -49,7 +49,7 @@
<!-- Astronaut -->
<div class="error_404_astro">
<object data="assets/astro.svg"></object>
<object data="/_gw/astro.svg"></object>
</div>
</div>

4
internal/tui/model.go
View File

@@ -68,8 +68,8 @@ type LogMsg string
type MetricMsg int64
type ClearCopiedMsg struct{}
func InitialModel(localPort, serverAddr, authToken string) Model {
c := tunnel.NewClient(serverAddr, localPort, authToken)
func InitialModel(localPort, serverAddr, authToken, hostHeader string, localHTTPS bool) Model {
c := tunnel.NewClient(serverAddr, localPort, authToken, hostHeader, localHTTPS)
return Model{
Client: c,
LogLines: []string{},

105
internal/tunnel/client.go
View File

@@ -1,6 +1,7 @@
package tunnel
import (
"crypto/tls"
"fmt"
"io"
"net"
@@ -23,6 +24,8 @@ type Client struct {
ServerAddr string
LocalPort string
AuthToken string
HostHeader string // New field for custom Host header
LocalHTTPS bool // New field: connect to local service with HTTPS
SSHClient *ssh.Client
Listener net.Listener
Events chan string // Channel to send logs/events to TUI
@@ -30,11 +33,13 @@ type Client struct {
PublicURL string // PublicURL is the URL accessible from the internet
}
func NewClient(serverAddr, localPort, authToken string) *Client {
func NewClient(serverAddr, localPort, authToken, hostHeader string, localHTTPS bool) *Client {
return &Client{
ServerAddr: serverAddr,
LocalPort: localPort,
AuthToken: authToken,
HostHeader: hostHeader,
LocalHTTPS: localHTTPS,
Events: make(chan string, 10),
Metrics: make(chan int64, 10),
}
@@ -110,37 +115,104 @@ func (c *Client) handleConnection(remoteConn net.Conn) {
defer remoteConn.Close()
// Dial local service
localConn, err := net.Dial("tcp", "localhost:"+c.LocalPort)
var localConn net.Conn
var err error
// Check if we should use TLS (explicit flag or port 443)
// You might want to strip "443" from "localhost:443" if localPort includes hostname, but user input is just port usually?
// User input is --local :443 or 443.
useTLS := c.LocalHTTPS
if c.LocalPort == "443" || strings.HasSuffix(c.LocalPort, ":443") {
useTLS = true
}
if useTLS {
conf := &tls.Config{InsecureSkipVerify: true}
localConn, err = tls.Dial("tcp", "localhost:"+c.LocalPort, conf)
} else {
localConn, err = net.Dial("tcp", "localhost:"+c.LocalPort)
}
if err != nil {
errMsg := fmt.Sprintf("Failed to dial local: %s", err)
errMsg := fmt.Sprintf("Failed to dial local (TLS=%v): %s", useTLS, err)
c.Events <- errMsg
logToFile(errMsg)
return
}
defer localConn.Close()
logToFile("Dialed local service successfully")
logToFile(fmt.Sprintf("Dialed local service successfully (TLS=%v)", useTLS))
// We need to peek at the connection to see if it's HTTP
// Wrap the connection to peek without consuming
logToFile("Handling new connection")
// Check if we can peek
// Since net.Conn doesn't support Peek, we read specific bytes and reconstruct
// or use a bufio reader if we weren't doing a raw Copy.
// But io.Copy needs a reader.
// Create a buffer to read the first few bytes
buf := make([]byte, 1024)
// Read first chunk to inspect headers
buf := make([]byte, 8192) // Increased buffer for headers
remoteConn.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
n, err := remoteConn.Read(buf)
if err != nil {
remoteConn.SetReadDeadline(time.Time{}) // Reset deadline
if err != nil && err != io.EOF && !os.IsTimeout(err) {
logToFile(fmt.Sprintf("Error reading from remote: %v", err))
return
}
if n == 0 {
return
}
payload := string(buf[:n])
// Try to parse rudimentary HTTP
// If it looks like HTTP, rewrite Host and add Proto headers
if strings.Contains(payload, "HTTP/") {
lines := strings.Split(payload, "\r\n")
var newLines []string
for _, line := range lines {
if strings.HasPrefix(strings.ToLower(line), "host:") {
if c.HostHeader != "" {
newLines = append(newLines, "Host: "+c.HostHeader)
} else {
// Default to localhost handling: keep original or set to localhost?
// Usually localhost:port is safest if user didn't specify.
newLines = append(newLines, "Host: localhost:"+c.LocalPort)
}
continue
}
newLines = append(newLines, line)
}
// Insert X-Forwarded-Proto if missing (prevents redirects loop)
if !strings.Contains(strings.ToLower(payload), "x-forwarded-proto:") {
// Find end of headers (empty line)
for i, line := range newLines {
if line == "" { // End of headers
// Insert before the empty line
finalHeaders := append(newLines[:i], "X-Forwarded-Proto: https")
finalHeaders = append(finalHeaders, newLines[i:]...)
newLines = finalHeaders
break
}
}
}
modifiedPayload := strings.Join(newLines, "\r\n")
// Log for debug
logToFile("Rewritten Headers:\n" + modifiedPayload)
// Send modified headers
localConn.Write([]byte(modifiedPayload))
} else {
// Not HTTP or couldn't parse, just forward as comes
localConn.Write(buf[:n])
}
// Try to parse rudimentary HTTP for TUI logs
// Format: METHOD PATH PROTOCOL
// We use the payload we just processed (or the original if not modified? No, logs should show original request usually,
// but here we have the payload string variable already.)
lines := strings.Split(payload, "\n")
if len(lines) > 0 {
firstLine := lines[0]
@@ -149,19 +221,14 @@ func (c *Client) handleConnection(remoteConn net.Conn) {
method := parts[0]
path := parts[1]
// Send structured log
c.Events <- fmt.Sprintf("HTTP|%s|%s|%d", method, path, 200) // Status is fake for now, acts as connection open
c.Events <- fmt.Sprintf("HTTP|%s|%s|%d", method, path, 200)
} else {
c.Events <- "TCP|||Connection"
}
}
// We need to write the bytes we read to the local connection first
localConn.Write(buf[:n])
// Bidirectional copy
// Calculate bytes?
// We can use a custom copy to track metrics
go func() {
n, _ := io.Copy(remoteConn, localConn)
c.Metrics <- n