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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,223 @@ | ||
| // Copyright 2023 The frp Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "context" | ||
| "crypto/tls" | ||
| "io" | ||
| "net" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| libdial "github.com/fatedier/golib/net/dial" | ||
| fmux "github.com/hashicorp/yamux" | ||
| quic "github.com/quic-go/quic-go" | ||
| "github.com/samber/lo" | ||
|
|
||
| v1 "github.com/fatedier/frp/pkg/config/v1" | ||
| "github.com/fatedier/frp/pkg/transport" | ||
| utilnet "github.com/fatedier/frp/pkg/util/net" | ||
| "github.com/fatedier/frp/pkg/util/xlog" | ||
| ) | ||
|
|
||
| // Connector is a interface for establishing connections to the server. | ||
| type Connector interface { | ||
| Open() error | ||
| Connect() (net.Conn, error) | ||
| Close() error | ||
| } | ||
|
|
||
| // defaultConnectorImpl is the default implementation of Connector for normal frpc. | ||
| type defaultConnectorImpl struct { | ||
| ctx context.Context | ||
| cfg *v1.ClientCommonConfig | ||
|
|
||
| muxSession *fmux.Session | ||
| quicConn quic.Connection | ||
| } | ||
|
|
||
| func NewConnector(ctx context.Context, cfg *v1.ClientCommonConfig) Connector { | ||
| return &defaultConnectorImpl{ | ||
| ctx: ctx, | ||
| cfg: cfg, | ||
| } | ||
| } | ||
|
|
||
| // Open opens a underlying connection to the server. | ||
| // The underlying connection is either a TCP connection or a QUIC connection. | ||
| // After the underlying connection is established, you can call Connect() to get a stream. | ||
| // If TCPMux isn't enabled, the underlying connection is nil, you will get a new real TCP connection every time you call Connect(). | ||
| func (c *defaultConnectorImpl) Open() error { | ||
| xl := xlog.FromContextSafe(c.ctx) | ||
|
|
||
| // special for quic | ||
| if strings.EqualFold(c.cfg.Transport.Protocol, "quic") { | ||
| var tlsConfig *tls.Config | ||
| var err error | ||
| sn := c.cfg.Transport.TLS.ServerName | ||
| if sn == "" { | ||
| sn = c.cfg.ServerAddr | ||
| } | ||
| if lo.FromPtr(c.cfg.Transport.TLS.Enable) { | ||
| tlsConfig, err = transport.NewClientTLSConfig( | ||
| c.cfg.Transport.TLS.CertFile, | ||
| c.cfg.Transport.TLS.KeyFile, | ||
| c.cfg.Transport.TLS.TrustedCaFile, | ||
| sn) | ||
| } else { | ||
| tlsConfig, err = transport.NewClientTLSConfig("", "", "", sn) | ||
| } | ||
| if err != nil { | ||
| xl.Warn("fail to build tls configuration, err: %v", err) | ||
| return err | ||
| } | ||
| tlsConfig.NextProtos = []string{"frp"} | ||
|
|
||
| conn, err := quic.DialAddr( | ||
| c.ctx, | ||
| net.JoinHostPort(c.cfg.ServerAddr, strconv.Itoa(c.cfg.ServerPort)), | ||
| tlsConfig, &quic.Config{ | ||
| MaxIdleTimeout: time.Duration(c.cfg.Transport.QUIC.MaxIdleTimeout) * time.Second, | ||
| MaxIncomingStreams: int64(c.cfg.Transport.QUIC.MaxIncomingStreams), | ||
| KeepAlivePeriod: time.Duration(c.cfg.Transport.QUIC.KeepalivePeriod) * time.Second, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| c.quicConn = conn | ||
| return nil | ||
| } | ||
|
|
||
| if !lo.FromPtr(c.cfg.Transport.TCPMux) { | ||
| return nil | ||
| } | ||
|
|
||
| conn, err := c.realConnect() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| fmuxCfg := fmux.DefaultConfig() | ||
| fmuxCfg.KeepAliveInterval = time.Duration(c.cfg.Transport.TCPMuxKeepaliveInterval) * time.Second | ||
| fmuxCfg.LogOutput = io.Discard | ||
| fmuxCfg.MaxStreamWindowSize = 6 * 1024 * 1024 | ||
| session, err := fmux.Client(conn, fmuxCfg) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| c.muxSession = session | ||
| return nil | ||
| } | ||
|
|
||
| // Connect returns a stream from the underlying connection, or a new TCP connection if TCPMux isn't enabled. | ||
| func (c *defaultConnectorImpl) Connect() (net.Conn, error) { | ||
| if c.quicConn != nil { | ||
| stream, err := c.quicConn.OpenStreamSync(context.Background()) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return utilnet.QuicStreamToNetConn(stream, c.quicConn), nil | ||
| } else if c.muxSession != nil { | ||
| stream, err := c.muxSession.OpenStream() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return stream, nil | ||
| } | ||
|
|
||
| return c.realConnect() | ||
| } | ||
|
|
||
| func (c *defaultConnectorImpl) realConnect() (net.Conn, error) { | ||
| xl := xlog.FromContextSafe(c.ctx) | ||
| var tlsConfig *tls.Config | ||
| var err error | ||
| tlsEnable := lo.FromPtr(c.cfg.Transport.TLS.Enable) | ||
| if c.cfg.Transport.Protocol == "wss" { | ||
| tlsEnable = true | ||
| } | ||
| if tlsEnable { | ||
| sn := c.cfg.Transport.TLS.ServerName | ||
| if sn == "" { | ||
| sn = c.cfg.ServerAddr | ||
| } | ||
|
|
||
| tlsConfig, err = transport.NewClientTLSConfig( | ||
| c.cfg.Transport.TLS.CertFile, | ||
| c.cfg.Transport.TLS.KeyFile, | ||
| c.cfg.Transport.TLS.TrustedCaFile, | ||
| sn) | ||
| if err != nil { | ||
| xl.Warn("fail to build tls configuration, err: %v", err) | ||
| return nil, err | ||
| } | ||
| } | ||
|
|
||
| proxyType, addr, auth, err := libdial.ParseProxyURL(c.cfg.Transport.ProxyURL) | ||
| if err != nil { | ||
| xl.Error("fail to parse proxy url") | ||
| return nil, err | ||
| } | ||
| dialOptions := []libdial.DialOption{} | ||
| protocol := c.cfg.Transport.Protocol | ||
| switch protocol { | ||
| case "websocket": | ||
| protocol = "tcp" | ||
| dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{Hook: utilnet.DialHookWebsocket(protocol, "")})) | ||
| dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{ | ||
| Hook: utilnet.DialHookCustomTLSHeadByte(tlsConfig != nil, lo.FromPtr(c.cfg.Transport.TLS.DisableCustomTLSFirstByte)), | ||
| })) | ||
| dialOptions = append(dialOptions, libdial.WithTLSConfig(tlsConfig)) | ||
| case "wss": | ||
| protocol = "tcp" | ||
| dialOptions = append(dialOptions, libdial.WithTLSConfigAndPriority(100, tlsConfig)) | ||
| // Make sure that if it is wss, the websocket hook is executed after the tls hook. | ||
| dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{Hook: utilnet.DialHookWebsocket(protocol, tlsConfig.ServerName), Priority: 110})) | ||
| default: | ||
| dialOptions = append(dialOptions, libdial.WithAfterHook(libdial.AfterHook{ | ||
| Hook: utilnet.DialHookCustomTLSHeadByte(tlsConfig != nil, lo.FromPtr(c.cfg.Transport.TLS.DisableCustomTLSFirstByte)), | ||
| })) | ||
| dialOptions = append(dialOptions, libdial.WithTLSConfig(tlsConfig)) | ||
| } | ||
|
|
||
| if c.cfg.Transport.ConnectServerLocalIP != "" { | ||
| dialOptions = append(dialOptions, libdial.WithLocalAddr(c.cfg.Transport.ConnectServerLocalIP)) | ||
| } | ||
| dialOptions = append(dialOptions, | ||
| libdial.WithProtocol(protocol), | ||
| libdial.WithTimeout(time.Duration(c.cfg.Transport.DialServerTimeout)*time.Second), | ||
| libdial.WithKeepAlive(time.Duration(c.cfg.Transport.DialServerKeepAlive)*time.Second), | ||
| libdial.WithProxy(proxyType, addr), | ||
| libdial.WithProxyAuth(auth), | ||
| ) | ||
| conn, err := libdial.DialContext( | ||
| c.ctx, | ||
| net.JoinHostPort(c.cfg.ServerAddr, strconv.Itoa(c.cfg.ServerPort)), | ||
| dialOptions..., | ||
| ) | ||
| return conn, err | ||
| } | ||
|
|
||
| func (c *defaultConnectorImpl) Close() error { | ||
| if c.quicConn != nil { | ||
| _ = c.quicConn.CloseWithError(0, "") | ||
| } | ||
| if c.muxSession != nil { | ||
| _ = c.muxSession.Close() | ||
| } | ||
| return nil | ||
| } |
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