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|
// Package tor implements Tor Hidden Service transport
package tor
import (
"fmt"
"net"
"net/url"
"golang.org/x/net/proxy"
"veilith/transport"
)
// TorTransport implements Tor-based networking
type TorTransport struct {
socksProxy string // SOCKS5 proxy address (default: 127.0.0.1:9050)
dialer proxy.Dialer
listener net.Listener
closed bool
}
// NewTorTransport creates a new Tor transport
func NewTorTransport(socksProxy string) (*TorTransport, error) {
if socksProxy == "" {
socksProxy = "127.0.0.1:9050" // Default Tor SOCKS proxy
}
// Create SOCKS5 dialer
proxyURL, err := url.Parse("socks5://" + socksProxy)
if err != nil {
return nil, fmt.Errorf("invalid SOCKS proxy address: %w", err)
}
dialer, err := proxy.FromURL(proxyURL, proxy.Direct)
if err != nil {
return nil, fmt.Errorf("failed to create SOCKS dialer: %w", err)
}
return &TorTransport{
socksProxy: socksProxy,
dialer: dialer,
}, nil
}
// Connect connects to a Tor Hidden Service (.onion address)
func (t *TorTransport) Connect(address string) (net.Conn, error) {
if t.closed {
return nil, fmt.Errorf("tor transport is closed")
}
// Validate .onion address
if !isOnionAddress(address) {
return nil, fmt.Errorf("invalid .onion address: %s", address)
}
// Connect via SOCKS proxy
conn, err := t.dialer.Dial("tcp", address)
if err != nil {
return nil, fmt.Errorf("failed to connect to %s: %w", address, err)
}
return conn, nil
}
// Listen starts a Tor Hidden Service listener
// Note: This is a simplified implementation. In production, you'd need to:
// 1. Configure torrc to create a hidden service
// 2. Get the .onion address from Tor control port
// 3. Listen on the local port specified in torrc
func (t *TorTransport) Listen(address string) (net.Listener, error) {
if t.closed {
return nil, fmt.Errorf("tor transport is closed")
}
if t.listener != nil {
return nil, fmt.Errorf("already listening")
}
// Listen on localhost (Tor will forward to this)
// In production, parse the address to get the port
listener, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
return nil, fmt.Errorf("failed to create listener: %w", err)
}
t.listener = listener
return listener, nil
}
// Type returns the transport type
func (t *TorTransport) Type() transport.TransportType {
return transport.TransportTor
}
// Close closes the Tor transport
func (t *TorTransport) Close() error {
if t.closed {
return nil
}
t.closed = true
if t.listener != nil {
if err := t.listener.Close(); err != nil {
return fmt.Errorf("failed to close listener: %w", err)
}
t.listener = nil
}
return nil
}
// GetSOCKSProxy returns the SOCKS proxy address
func (t *TorTransport) GetSOCKSProxy() string {
return t.socksProxy
}
// isOnionAddress checks if an address is a valid .onion address
func isOnionAddress(address string) bool {
// Simple validation: check if it contains ".onion"
// In production, use regex to validate v3 onion addresses (56 chars base32)
return len(address) > 6 && address[len(address)-6:] == ".onion" ||
len(address) > 13 && address[len(address)-13:len(address)-7] == ".onion:"
}
// String returns a string representation
func (t *TorTransport) String() string {
return fmt.Sprintf("TorTransport(proxy=%s, closed=%v)", t.socksProxy, t.closed)
}
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