mirror of
https://github.com/Syngnat/GoNavi.git
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347 lines
9.0 KiB
Go
347 lines
9.0 KiB
Go
package proxy
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import (
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"bufio"
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"context"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"io"
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"net"
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"net/http"
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"net/url"
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"strings"
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"sync"
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"time"
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"GoNavi-Wails/internal/connection"
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"GoNavi-Wails/internal/logger"
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xproxy "golang.org/x/net/proxy"
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)
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const (
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defaultDialTimeout = 8 * time.Second
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)
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type LocalForwarder struct {
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LocalAddr string
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RemoteAddr string
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ProxyAddr string
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ProxyType string
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cfg connection.ProxyConfig
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listener net.Listener
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closeChan chan struct{}
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closeOnce sync.Once
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closed bool
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closedMu sync.RWMutex
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}
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var (
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forwarderMu sync.RWMutex
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localForwarders = make(map[string]*LocalForwarder)
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)
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func NormalizeConfig(config connection.ProxyConfig) (connection.ProxyConfig, error) {
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result := connection.ProxyConfig{
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Type: strings.ToLower(strings.TrimSpace(config.Type)),
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Host: strings.TrimSpace(config.Host),
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Port: config.Port,
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User: strings.TrimSpace(config.User),
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Password: config.Password,
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}
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switch result.Type {
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case "socks5", "socks5h", "http":
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default:
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return result, proxyTextError("proxy.backend.error.unsupported_type", map[string]any{"type": config.Type})
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}
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if result.Type == "socks5h" {
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result.Type = "socks5"
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}
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if result.Host == "" {
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return result, proxyTextError("proxy.backend.error.host_empty", nil)
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}
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if result.Port <= 0 || result.Port > 65535 {
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return result, proxyTextError("proxy.backend.error.port_invalid", map[string]any{"port": result.Port})
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}
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return result, nil
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}
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func GetOrCreateLocalForwarder(proxyConfig connection.ProxyConfig, remoteHost string, remotePort int) (*LocalForwarder, error) {
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cfg, err := NormalizeConfig(proxyConfig)
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if err != nil {
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return nil, err
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}
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if strings.TrimSpace(remoteHost) == "" || remotePort <= 0 {
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return nil, proxyTextError("proxy.backend.error.remote_addr_invalid", map[string]any{
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"address": fmt.Sprintf("%s:%d", remoteHost, remotePort),
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})
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}
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key := forwarderCacheKey(cfg, remoteHost, remotePort)
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forwarderMu.RLock()
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forwarder, exists := localForwarders[key]
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forwarderMu.RUnlock()
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if exists && forwarder != nil && !forwarder.IsClosed() {
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return forwarder, nil
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}
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if exists {
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forwarderMu.Lock()
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delete(localForwarders, key)
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forwarderMu.Unlock()
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}
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next, err := NewLocalForwarder(cfg, remoteHost, remotePort)
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if err != nil {
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return nil, err
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}
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forwarderMu.Lock()
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localForwarders[key] = next
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forwarderMu.Unlock()
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return next, nil
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}
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func forwarderCacheKey(cfg connection.ProxyConfig, remoteHost string, remotePort int) string {
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trimmedHost := strings.TrimSpace(remoteHost)
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credential := cfg.User + "\x00" + cfg.Password
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credentialHash := sha256.Sum256([]byte(credential))
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// 仅保留短指纹用于区分不同认证信息，避免在 key 日志中泄露明文口令。
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fingerprint := hex.EncodeToString(credentialHash[:8])
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return fmt.Sprintf("%s://%s:%d@%s:%d#%s", cfg.Type, cfg.Host, cfg.Port, trimmedHost, remotePort, fingerprint)
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}
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func NewLocalForwarder(proxyConfig connection.ProxyConfig, remoteHost string, remotePort int) (*LocalForwarder, error) {
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cfg, err := NormalizeConfig(proxyConfig)
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if err != nil {
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return nil, err
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}
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listener, err := net.Listen("tcp", "127.0.0.1:0")
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if err != nil {
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return nil, proxyWrapError("proxy.backend.error.listen_failed", map[string]any{"detail": err.Error()}, err)
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}
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localAddr := listener.Addr().String()
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remoteAddr := net.JoinHostPort(strings.TrimSpace(remoteHost), fmt.Sprintf("%d", remotePort))
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proxyAddr := net.JoinHostPort(cfg.Host, fmt.Sprintf("%d", cfg.Port))
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forwarder := &LocalForwarder{
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LocalAddr: localAddr,
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RemoteAddr: remoteAddr,
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ProxyAddr: proxyAddr,
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ProxyType: cfg.Type,
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cfg: cfg,
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listener: listener,
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closeChan: make(chan struct{}),
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}
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go forwarder.forward()
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logger.Infof("已创建代理端口转发：本地 %s -> 远端 %s（代理 %s://%s）", localAddr, remoteAddr, cfg.Type, proxyAddr)
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return forwarder, nil
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}
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func (f *LocalForwarder) forward() {
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for {
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localConn, err := f.listener.Accept()
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if err != nil {
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select {
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case <-f.closeChan:
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return
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default:
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logger.Warnf("接受本地代理连接失败：%v", err)
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return
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}
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}
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go f.handleConnection(localConn)
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}
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}
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func (f *LocalForwarder) handleConnection(localConn net.Conn) {
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defer localConn.Close()
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ctx, cancel := context.WithTimeout(context.Background(), defaultDialTimeout)
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remoteConn, err := dialThroughProxy(ctx, f.cfg, "tcp", f.RemoteAddr)
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cancel()
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if err != nil {
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logger.Warnf("通过代理连接远端失败：远端=%s 代理=%s://%s 错误=%v", f.RemoteAddr, f.ProxyType, f.ProxyAddr, err)
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return
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}
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defer remoteConn.Close()
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errc := make(chan error, 2)
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var closeOnce sync.Once
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closeBoth := func() {
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_ = localConn.Close()
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_ = remoteConn.Close()
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}
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go func() {
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_, copyErr := io.Copy(remoteConn, localConn)
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closeOnce.Do(closeBoth)
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errc <- copyErr
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}()
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go func() {
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_, copyErr := io.Copy(localConn, remoteConn)
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closeOnce.Do(closeBoth)
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errc <- copyErr
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}()
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<-errc
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<-errc
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}
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func (f *LocalForwarder) Close() error {
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var err error
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f.closeOnce.Do(func() {
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f.closedMu.Lock()
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f.closed = true
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f.closedMu.Unlock()
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close(f.closeChan)
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err = f.listener.Close()
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if err != nil {
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logger.Warnf("关闭代理端口转发失败：%v", err)
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}
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})
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return err
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}
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func (f *LocalForwarder) IsClosed() bool {
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f.closedMu.RLock()
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defer f.closedMu.RUnlock()
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return f.closed
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}
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func CloseAllForwarders() {
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forwarderMu.Lock()
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defer forwarderMu.Unlock()
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for key, forwarder := range localForwarders {
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if forwarder == nil {
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continue
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}
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_ = forwarder.Close()
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logger.Infof("已关闭代理端口转发：%s", key)
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}
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localForwarders = make(map[string]*LocalForwarder)
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}
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func DialContext(ctx context.Context, proxyConfig connection.ProxyConfig, network, address string) (net.Conn, error) {
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cfg, err := NormalizeConfig(proxyConfig)
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if err != nil {
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return nil, err
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}
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return dialThroughProxy(ctx, cfg, network, address)
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}
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func dialThroughProxy(ctx context.Context, cfg connection.ProxyConfig, network, address string) (net.Conn, error) {
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switch cfg.Type {
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case "socks5":
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return dialSOCKS5(ctx, cfg, network, address)
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case "http":
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return dialHTTPConnect(ctx, cfg, address)
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default:
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return nil, proxyTextError("proxy.backend.error.unsupported_type", map[string]any{"type": cfg.Type})
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}
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}
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func dialSOCKS5(ctx context.Context, cfg connection.ProxyConfig, network, address string) (net.Conn, error) {
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proxyAddr := net.JoinHostPort(cfg.Host, fmt.Sprintf("%d", cfg.Port))
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var auth *xproxy.Auth
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if cfg.User != "" || cfg.Password != "" {
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auth = &xproxy.Auth{
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User: cfg.User,
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Password: cfg.Password,
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}
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}
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dialer, err := xproxy.SOCKS5("tcp", proxyAddr, auth, &net.Dialer{Timeout: defaultDialTimeout})
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if err != nil {
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return nil, proxyWrapError("proxy.backend.error.socks5_dialer_failed", map[string]any{"detail": err.Error()}, err)
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}
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type result struct {
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conn net.Conn
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err error
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}
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ch := make(chan result, 1)
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go func() {
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conn, dialErr := dialer.Dial(network, address)
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ch <- result{conn: conn, err: dialErr}
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}()
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select {
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case <-ctx.Done():
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go func() {
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r := <-ch
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if r.conn != nil {
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_ = r.conn.Close()
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}
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}()
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return nil, ctx.Err()
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case r := <-ch:
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if r.err != nil {
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return nil, proxyWrapError("proxy.backend.error.socks5_connect_failed", map[string]any{"detail": r.err.Error()}, r.err)
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}
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return r.conn, nil
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}
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}
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func dialHTTPConnect(ctx context.Context, cfg connection.ProxyConfig, address string) (net.Conn, error) {
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proxyAddr := net.JoinHostPort(cfg.Host, fmt.Sprintf("%d", cfg.Port))
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dialer := &net.Dialer{Timeout: defaultDialTimeout}
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conn, err := dialer.DialContext(ctx, "tcp", proxyAddr)
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if err != nil {
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return nil, proxyWrapError("proxy.backend.error.http_connect_failed", map[string]any{"detail": err.Error()}, err)
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}
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connectReq := &http.Request{
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Method: http.MethodConnect,
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URL: &url.URL{Opaque: address},
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Host: address,
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Header: make(http.Header),
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}
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if cfg.User != "" || cfg.Password != "" {
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raw := cfg.User + ":" + cfg.Password
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connectReq.Header.Set("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(raw)))
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}
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if err := connectReq.Write(conn); err != nil {
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_ = conn.Close()
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return nil, proxyWrapError("proxy.backend.error.http_connect_write_failed", map[string]any{"detail": err.Error()}, err)
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}
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reader := bufio.NewReader(conn)
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resp, err := http.ReadResponse(reader, connectReq)
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if err != nil {
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_ = conn.Close()
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return nil, proxyWrapError("proxy.backend.error.http_connect_read_failed", map[string]any{"detail": err.Error()}, err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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_ = conn.Close()
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return nil, proxyTextError("proxy.backend.error.http_connect_status_failed", map[string]any{"status": strings.TrimSpace(resp.Status)})
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}
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if reader.Buffered() == 0 {
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return conn, nil
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}
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return &bufferedConn{Conn: conn, reader: reader}, nil
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}
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type bufferedConn struct {
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net.Conn
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reader *bufio.Reader
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}
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func (c *bufferedConn) Read(p []byte) (int, error) {
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if c.reader == nil {
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return c.Conn.Read(p)
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}
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if c.reader.Buffered() == 0 {
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c.reader = nil
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return c.Conn.Read(p)
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}
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return c.reader.Read(p)
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}
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