132 lines
2.7 KiB
Go
132 lines
2.7 KiB
Go
package mtcp
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import (
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"context"
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"errors"
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"net"
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"sync"
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"time"
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"github.com/go-gost/core/dialer"
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"github.com/go-gost/core/logger"
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md "github.com/go-gost/core/metadata"
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"github.com/go-gost/x/internal/util/mux"
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"github.com/go-gost/x/registry"
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)
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func init() {
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registry.DialerRegistry().Register("mtcp", NewDialer)
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}
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type mtcpDialer struct {
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sessions map[string]*muxSession
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sessionMutex sync.Mutex
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logger logger.Logger
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md metadata
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options dialer.Options
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}
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func NewDialer(opts ...dialer.Option) dialer.Dialer {
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options := dialer.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &mtcpDialer{
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sessions: make(map[string]*muxSession),
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logger: options.Logger,
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options: options,
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}
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}
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func (d *mtcpDialer) Init(md md.Metadata) (err error) {
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if err = d.parseMetadata(md); err != nil {
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return
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}
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return nil
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}
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// Multiplex implements dialer.Multiplexer interface.
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func (d *mtcpDialer) Multiplex() bool {
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return true
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}
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func (d *mtcpDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
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d.sessionMutex.Lock()
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defer d.sessionMutex.Unlock()
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session, ok := d.sessions[addr]
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if session != nil && session.IsClosed() {
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delete(d.sessions, addr) // session is dead
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ok = false
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}
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if !ok {
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var options dialer.DialOptions
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for _, opt := range opts {
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opt(&options)
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}
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conn, err = options.NetDialer.Dial(ctx, "tcp", addr)
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if err != nil {
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return
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}
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session = &muxSession{conn: conn}
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d.sessions[addr] = session
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}
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return session.conn, err
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}
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// Handshake implements dialer.Handshaker
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func (d *mtcpDialer) Handshake(ctx context.Context, conn net.Conn, options ...dialer.HandshakeOption) (net.Conn, error) {
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opts := &dialer.HandshakeOptions{}
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for _, option := range options {
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option(opts)
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}
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d.sessionMutex.Lock()
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defer d.sessionMutex.Unlock()
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if d.md.handshakeTimeout > 0 {
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conn.SetDeadline(time.Now().Add(d.md.handshakeTimeout))
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defer conn.SetDeadline(time.Time{})
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}
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session, ok := d.sessions[opts.Addr]
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if session != nil && session.conn != conn {
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conn.Close()
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return nil, errors.New("mtls: unrecognized connection")
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}
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if !ok || session.session == nil {
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s, err := d.initSession(ctx, conn)
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if err != nil {
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d.logger.Error(err)
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conn.Close()
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delete(d.sessions, opts.Addr)
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return nil, err
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}
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session = s
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d.sessions[opts.Addr] = session
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}
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cc, err := session.GetConn()
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if err != nil {
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session.Close()
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delete(d.sessions, opts.Addr)
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return nil, err
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}
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return cc, nil
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}
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func (d *mtcpDialer) initSession(ctx context.Context, conn net.Conn) (*muxSession, error) {
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// stream multiplex
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session, err := mux.ClientSession(conn, d.md.muxCfg)
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if err != nil {
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return nil, err
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}
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return &muxSession{conn: conn, session: session}, nil
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}
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