297 lines
7.6 KiB
Go
297 lines
7.6 KiB
Go
package mysql
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import (
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"context"
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"crypto/tls"
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"net"
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"sync"
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"sync/atomic"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/adapter/outbound"
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"github.com/sagernet/sing-box/common/dialer"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/bufio"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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"github.com/sagernet/smux"
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"github.com/go-mysql-org/go-mysql/client"
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)
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func RegisterOutbound(registry *outbound.Registry) {
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outbound.Register[option.MySQLOutboundOptions](registry, C.TypeMySQL, NewOutbound)
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}
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var _ adapter.InterfaceUpdateListener = (*Outbound)(nil)
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type Outbound struct {
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outbound.Adapter
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ctx context.Context
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logger logger.ContextLogger
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dialer N.Dialer
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serverAddr M.Socksaddr
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username string
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password string
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tlsConfig *tls.Config
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maxConnections int
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nextSession uint32
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sessionAccess sync.Mutex
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sessions []*muxSession
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}
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type muxSession struct {
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session *smux.Session
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conn net.Conn
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}
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func NewOutbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.MySQLOutboundOptions) (adapter.Outbound, error) {
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outboundDialer, err := dialer.New(ctx, options.DialerOptions, options.ServerIsDomain())
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if err != nil {
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return nil, err
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}
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outbound := &Outbound{
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Adapter: outbound.NewAdapterWithDialerOptions(C.TypeMySQL, tag, []string{N.NetworkTCP, N.NetworkUDP}, options.DialerOptions),
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ctx: ctx,
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logger: logger,
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dialer: outboundDialer,
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serverAddr: options.ServerOptions.Build(),
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username: options.Username,
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password: options.Password,
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maxConnections: 1,
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}
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if options.Multiplex != nil && options.Multiplex.Enabled && options.Multiplex.MaxConnections > 1 {
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outbound.maxConnections = options.Multiplex.MaxConnections
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}
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outbound.sessions = make([]*muxSession, outbound.maxConnections)
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if outbound.serverAddr.Port == 0 {
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outbound.serverAddr.Port = 3306
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}
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if outbound.username == "" {
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outbound.username = "root"
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}
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// Build TLS config for MySQL client handshake
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if options.TLS != nil && options.TLS.Enabled {
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outbound.tlsConfig = &tls.Config{
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InsecureSkipVerify: options.TLS.Insecure,
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ServerName: options.TLS.ServerName,
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}
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if outbound.tlsConfig.ServerName == "" {
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outbound.tlsConfig.ServerName = options.Server
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}
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} else {
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// Default: use insecure TLS (since this is for tunneling, not real MySQL)
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outbound.tlsConfig = &tls.Config{
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InsecureSkipVerify: true,
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}
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}
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return outbound, nil
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}
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func (h *Outbound) createSession() (*muxSession, error) {
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h.logger.InfoContext(h.ctx, "creating smux session")
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// Dial TCP connection to server
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conn, err := h.dialer.DialContext(h.ctx, N.NetworkTCP, h.serverAddr)
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if err != nil {
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return nil, E.Cause(err, "dial server")
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}
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// Perform MySQL handshake with TLS
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mysqlConn, err := client.ConnectWithDialer(
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h.ctx,
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"tcp",
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h.serverAddr.String(),
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h.username,
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h.password,
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"",
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func(ctx context.Context, network, address string) (net.Conn, error) {
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// Return the already-established connection
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return conn, nil
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},
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func(c *client.Conn) error {
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c.SetTLSConfig(h.tlsConfig)
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return nil
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},
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)
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if err != nil {
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conn.Close()
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return nil, E.Cause(err, "MySQL handshake")
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}
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// After MySQL handshake, the underlying connection is TLS-encrypted.
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// Get the underlying net.Conn.
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tlsConn := mysqlConn.Conn.Conn
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// Create smux session over the TLS connection
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session, err := smux.Client(tlsConn, smuxConfig())
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if err != nil {
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tlsConn.Close()
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return nil, E.Cause(err, "create mux session")
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}
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return &muxSession{session: session, conn: tlsConn}, nil
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}
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func (h *Outbound) getSession(index int) (*smux.Session, error) {
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h.sessionAccess.Lock()
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defer h.sessionAccess.Unlock()
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entry := h.sessions[index]
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if entry != nil && !entry.session.IsClosed() {
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return entry.session, nil
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}
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if entry != nil {
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entry.conn.Close()
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h.sessions[index] = nil
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}
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entry, err := h.createSession()
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if err != nil {
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return nil, err
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}
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h.sessions[index] = entry
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go func(index int, session *smux.Session, conn net.Conn) {
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// When session is closed, clean up
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<-session.CloseChan()
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h.sessionAccess.Lock()
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if current := h.sessions[index]; current != nil && current.session == session {
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h.sessions[index] = nil
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}
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h.sessionAccess.Unlock()
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conn.Close()
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}(index, entry.session, entry.conn)
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return entry.session, nil
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}
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func (h *Outbound) invalidateSession(index int, session *smux.Session) {
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h.sessionAccess.Lock()
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defer h.sessionAccess.Unlock()
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if current := h.sessions[index]; current != nil && current.session == session {
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h.sessions[index] = nil
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current.conn.Close()
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}
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}
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func (h *Outbound) openStream(ctx context.Context, command byte, destination M.Socksaddr) (net.Conn, error) {
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_ = ctx
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start := int(atomic.AddUint32(&h.nextSession, 1)-1) % h.maxConnections
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var lastErr error
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for i := 0; i < h.maxConnections; i++ {
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index := (start + i) % h.maxConnections
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session, err := h.getSession(index)
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if err != nil {
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lastErr = err
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continue
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}
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stream, err := session.OpenStream()
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if err != nil {
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h.invalidateSession(index, session)
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lastErr = err
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continue
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}
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// Write stream header: command + destination
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_, err = stream.Write([]byte{command})
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if err != nil {
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stream.Close()
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lastErr = E.Cause(err, "write stream header command")
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continue
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}
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err = M.SocksaddrSerializer.WriteAddrPort(stream, destination)
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if err != nil {
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stream.Close()
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lastErr = E.Cause(err, "write stream header destination")
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continue
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}
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return stream, nil
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}
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if lastErr == nil {
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lastErr = E.New("open mux stream")
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}
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return nil, E.Cause(lastErr, "open mux stream")
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}
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func (h *Outbound) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
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switch N.NetworkName(network) {
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case N.NetworkTCP:
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h.logger.InfoContext(ctx, "outbound connection to ", destination)
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return h.openStream(ctx, commandTCP, destination)
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case N.NetworkUDP:
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h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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conn, err := h.openStream(ctx, commandUDP, destination)
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if err != nil {
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return nil, err
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}
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return bufio.NewBindPacketConn(&packetConn{conn}, destination), nil
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default:
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return nil, E.New("unsupported network: ", network)
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}
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}
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func (h *Outbound) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
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h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
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conn, err := h.openStream(ctx, commandUDP, destination)
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if err != nil {
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return nil, err
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}
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return &packetConn{conn}, nil
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}
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func (h *Outbound) InterfaceUpdated() {
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h.sessionAccess.Lock()
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defer h.sessionAccess.Unlock()
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for i, session := range h.sessions {
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if session == nil {
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continue
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}
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session.session.Close()
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session.conn.Close()
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h.sessions[i] = nil
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}
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}
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func (h *Outbound) Close() error {
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h.sessionAccess.Lock()
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defer h.sessionAccess.Unlock()
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var err error
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for i, session := range h.sessions {
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if session == nil {
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continue
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}
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err = common.Close(session.session, session.conn)
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h.sessions[i] = nil
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}
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return err
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}
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// packetConn wraps a net.Conn as a net.PacketConn for UDP-over-TCP
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type packetConn struct {
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net.Conn
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}
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func (c *packetConn) ReadFrom(p []byte) (n int, addr net.Addr, err error) {
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n, err = c.Conn.Read(p)
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return
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}
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func (c *packetConn) WriteTo(p []byte, addr net.Addr) (n int, err error) {
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return c.Conn.Write(p)
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}
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