new feature plugin and unix domian socket plugin

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.6
+FROM golang:1.8
 
 COPY . /go/src/github.com/fatedier/frp
 

Makefile

@@ -42,7 +42,7 @@ alltest: gotest
 clean:
 	rm -f ./bin/frpc
 	rm -f ./bin/frps
-	cd ./test && ./clean_test.sh && cd -
+	cd ./tests && ./clean_test.sh && cd -
 
 save:
 	godep save ./...

client/control.go

@@ -166,7 +166,7 @@ func (ctl *Control) NewWorkConn() {
 
 	// dispatch this work connection to related proxy
 	if pxy, ok := ctl.proxies[startMsg.ProxyName]; ok {
-		workConn.Info("start a new work connection, localAddr: %s remoteAddr: %s", workConn.LocalAddr().String(), workConn.RemoteAddr().String())
+		workConn.Debug("start a new work connection, localAddr: %s remoteAddr: %s", workConn.LocalAddr().String(), workConn.RemoteAddr().String())
 		go pxy.InWorkConn(workConn)
 	} else {
 		workConn.Close()

client/proxy.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/fatedier/frp/models/config"
 	"github.com/fatedier/frp/models/msg"
+	"github.com/fatedier/frp/models/plugin"
 	"github.com/fatedier/frp/models/proto/tcp"
 	"github.com/fatedier/frp/models/proto/udp"
 	"github.com/fatedier/frp/utils/errors"
@@ -81,57 +82,87 @@ type BaseProxy struct {
 type TcpProxy struct {
 	BaseProxy
 
-	cfg *config.TcpProxyConf
+	cfg         *config.TcpProxyConf
+	proxyPlugin plugin.Plugin
 }
 
 func (pxy *TcpProxy) Run() (err error) {
+	if pxy.cfg.Plugin != "" {
+		pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
+		if err != nil {
+			return
+		}
+	}
 	return
 }
 
 func (pxy *TcpProxy) Close() {
+	if pxy.proxyPlugin != nil {
+		pxy.proxyPlugin.Close()
+	}
 }
 
 func (pxy *TcpProxy) InWorkConn(conn frpNet.Conn) {
 	defer conn.Close()
-	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, &pxy.cfg.BaseProxyConf, conn)
+	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn)
 }
 
 // HTTP
 type HttpProxy struct {
 	BaseProxy
 
-	cfg *config.HttpProxyConf
+	cfg         *config.HttpProxyConf
+	proxyPlugin plugin.Plugin
 }
 
 func (pxy *HttpProxy) Run() (err error) {
+	if pxy.cfg.Plugin != "" {
+		pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
+		if err != nil {
+			return
+		}
+	}
 	return
 }
 
 func (pxy *HttpProxy) Close() {
+	if pxy.proxyPlugin != nil {
+		pxy.proxyPlugin.Close()
+	}
 }
 
 func (pxy *HttpProxy) InWorkConn(conn frpNet.Conn) {
 	defer conn.Close()
-	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, &pxy.cfg.BaseProxyConf, conn)
+	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn)
 }
 
 // HTTPS
 type HttpsProxy struct {
 	BaseProxy
 
-	cfg *config.HttpsProxyConf
+	cfg         *config.HttpsProxyConf
+	proxyPlugin plugin.Plugin
 }
 
 func (pxy *HttpsProxy) Run() (err error) {
+	if pxy.cfg.Plugin != "" {
+		pxy.proxyPlugin, err = plugin.Create(pxy.cfg.Plugin, pxy.cfg.PluginParams)
+		if err != nil {
+			return
+		}
+	}
 	return
 }
 
 func (pxy *HttpsProxy) Close() {
+	if pxy.proxyPlugin != nil {
+		pxy.proxyPlugin.Close()
+	}
 }
 
 func (pxy *HttpsProxy) InWorkConn(conn frpNet.Conn) {
 	defer conn.Close()
-	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, &pxy.cfg.BaseProxyConf, conn)
+	HandleTcpWorkConnection(&pxy.cfg.LocalSvrConf, pxy.proxyPlugin, &pxy.cfg.BaseProxyConf, conn)
 }
 
 // UDP
@@ -240,14 +271,13 @@ func (pxy *UdpProxy) InWorkConn(conn frpNet.Conn) {
 }
 
 // Common handler for tcp work connections.
-func HandleTcpWorkConnection(localInfo *config.LocalSvrConf, baseInfo *config.BaseProxyConf, workConn frpNet.Conn) {
-	localConn, err := frpNet.ConnectTcpServer(fmt.Sprintf("%s:%d", localInfo.LocalIp, localInfo.LocalPort))
-	if err != nil {
-		workConn.Error("connect to local service [%s:%d] error: %v", localInfo.LocalIp, localInfo.LocalPort, err)
-		return
-	}
+func HandleTcpWorkConnection(localInfo *config.LocalSvrConf, proxyPlugin plugin.Plugin,
+	baseInfo *config.BaseProxyConf, workConn frpNet.Conn) {
 
-	var remote io.ReadWriteCloser
+	var (
+		remote io.ReadWriteCloser
+		err    error
+	)
 	remote = workConn
 	if baseInfo.UseEncryption {
 		remote, err = tcp.WithEncryption(remote, []byte(config.ClientCommonCfg.PrivilegeToken))
@@ -259,8 +289,23 @@ func HandleTcpWorkConnection(localInfo *config.LocalSvrConf, baseInfo *config.Ba
 	if baseInfo.UseCompression {
 		remote = tcp.WithCompression(remote)
 	}
-	workConn.Debug("join connections, localConn(l[%s] r[%s]) workConn(l[%s] r[%s])", localConn.LocalAddr().String(),
-		localConn.RemoteAddr().String(), workConn.LocalAddr().String(), workConn.RemoteAddr().String())
-	tcp.Join(localConn, remote)
-	workConn.Debug("join connections closed")
+
+	if proxyPlugin != nil {
+		// if plugin is set, let plugin handle connections first
+		workConn.Debug("handle by plugin: %s", proxyPlugin.Name())
+		proxyPlugin.Handle(remote)
+		workConn.Debug("handle by plugin finished")
+		return
+	} else {
+		localConn, err := frpNet.ConnectTcpServer(fmt.Sprintf("%s:%d", localInfo.LocalIp, localInfo.LocalPort))
+		if err != nil {
+			workConn.Error("connect to local service [%s:%d] error: %v", localInfo.LocalIp, localInfo.LocalPort, err)
+			return
+		}
+
+		workConn.Debug("join connections, localConn(l[%s] r[%s]) workConn(l[%s] r[%s])", localConn.LocalAddr().String(),
+			localConn.RemoteAddr().String(), workConn.LocalAddr().String(), workConn.RemoteAddr().String())
+		tcp.Join(localConn, remote)
+		workConn.Debug("join connections closed")
+	}
 }

cmd/frpc/main.go

@@ -46,7 +46,7 @@ Options:
     --log-level=<log_level>     set log level: debug, info, warn, error
     --server-addr=<server_addr> addr which frps is listening for, example: 0.0.0.0:7000
     -h --help                   show this screen
-    --version                   show version
+    -v --version                show version
 `
 
 func main() {

conf/frpc.ini

@@ -81,3 +81,12 @@ use_encryption = false
 use_compression = false 
 subdomain = web01
 custom_domains = web02.yourdomain.com
+
+[unix_domain]
+type = tcp
+remote_port = 6001
+# if plugin is defined, local_ip and local_port is useless
+# plugin will handle connections got from frps
+plugin = unix_domain_socket
+# params set with prefix "plugin_" that plugin needed
+plugin_unix_path = /var/run/docker.sock

models/config/proxy.go

@@ -239,6 +239,7 @@ func (cfg *DomainConf) check() (err error) {
 	return nil
 }
 
+// Local service info
 type LocalSvrConf struct {
 	LocalIp   string `json:"-"`
 	LocalPort int    `json:"-"`
@@ -259,12 +260,34 @@ func (cfg *LocalSvrConf) LoadFromFile(name string, section ini.Section) (err err
 	return nil
 }
 
+type PluginConf struct {
+	Plugin       string            `json:"-"`
+	PluginParams map[string]string `json:"-"`
+}
+
+func (cfg *PluginConf) LoadFromFile(name string, section ini.Section) (err error) {
+	cfg.Plugin = section["plugin"]
+	cfg.PluginParams = make(map[string]string)
+	if cfg.Plugin != "" {
+		// get params begin with "plugin_"
+		for k, v := range section {
+			if strings.HasPrefix(k, "plugin_") {
+				cfg.PluginParams[k] = v
+			}
+		}
+	} else {
+		return fmt.Errorf("Parse conf error: proxy [%s] no plugin info found", name)
+	}
+	return
+}
+
 // TCP
 type TcpProxyConf struct {
 	BaseProxyConf
 	BindInfoConf
 
 	LocalSvrConf
+	PluginConf
 }
 
 func (cfg *TcpProxyConf) LoadFromMsg(pMsg *msg.NewProxy) {
@@ -279,8 +302,11 @@ func (cfg *TcpProxyConf) LoadFromFile(name string, section ini.Section) (err err
 	if err = cfg.BindInfoConf.LoadFromFile(name, section); err != nil {
 		return
 	}
-	if err = cfg.LocalSvrConf.LoadFromFile(name, section); err != nil {
-		return
+
+	if err = cfg.PluginConf.LoadFromFile(name, section); err != nil {
+		if err = cfg.LocalSvrConf.LoadFromFile(name, section); err != nil {
+			return
+		}
 	}
 	return
 }
@@ -337,6 +363,7 @@ type HttpProxyConf struct {
 	DomainConf
 
 	LocalSvrConf
+	PluginConf
 
 	Locations         []string `json:"locations"`
 	HostHeaderRewrite string   `json:"host_header_rewrite"`
@@ -405,6 +432,7 @@ type HttpsProxyConf struct {
 	DomainConf
 
 	LocalSvrConf
+	PluginConf
 }
 
 func (cfg *HttpsProxyConf) LoadFromMsg(pMsg *msg.NewProxy) {

models/plugin/plugin.go

@@ -0,0 +1,45 @@
+// Copyright 2017 fatedier, fatedier@gmail.com
+//
+// 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 plugin
+
+import (
+	"fmt"
+	"io"
+)
+
+// Creators is used for create plugins to handle connections.
+var creators = make(map[string]CreatorFn)
+
+// params has prefix "plugin_"
+type CreatorFn func(params map[string]string) (Plugin, error)
+
+func Register(name string, fn CreatorFn) {
+	creators[name] = fn
+}
+
+func Create(name string, params map[string]string) (p Plugin, err error) {
+	if fn, ok := creators[name]; ok {
+		p, err = fn(params)
+	} else {
+		err = fmt.Errorf("plugin [%s] is not registered", name)
+	}
+	return
+}
+
+type Plugin interface {
+	Name() string
+	Handle(conn io.ReadWriteCloser)
+	Close() error
+}

models/plugin/unix_domain_socket.go

@@ -0,0 +1,69 @@
+// Copyright 2017 fatedier, fatedier@gmail.com
+//
+// 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 plugin
+
+import (
+	"fmt"
+	"io"
+	"net"
+
+	"github.com/fatedier/frp/models/proto/tcp"
+)
+
+const PluginUnixDomainSocket = "unix_domain_socket"
+
+func init() {
+	Register(PluginUnixDomainSocket, NewUnixDomainSocketPlugin)
+}
+
+type UnixDomainSocketPlugin struct {
+	UnixAddr *net.UnixAddr
+}
+
+func NewUnixDomainSocketPlugin(params map[string]string) (p Plugin, err error) {
+	unixPath, ok := params["plugin_unix_path"]
+	if !ok {
+		err = fmt.Errorf("plugin_unix_path not found")
+		return
+	}
+
+	unixAddr, errRet := net.ResolveUnixAddr("unix", unixPath)
+	if errRet != nil {
+		err = errRet
+		return
+	}
+
+	p = &UnixDomainSocketPlugin{
+		UnixAddr: unixAddr,
+	}
+	return
+}
+
+func (uds *UnixDomainSocketPlugin) Handle(conn io.ReadWriteCloser) {
+	localConn, err := net.DialUnix("unix", nil, uds.UnixAddr)
+	if err != nil {
+		return
+	}
+
+	tcp.Join(localConn, conn)
+}
+
+func (uds *UnixDomainSocketPlugin) Name() string {
+	return PluginUnixDomainSocket
+}
+
+func (uds *UnixDomainSocketPlugin) Close() error {
+	return nil
+}

tests/conf/auto_test_frpc.ini

@@ -27,3 +27,9 @@ type = udp
 local_ip = 127.0.0.1
 local_port = 10703
 remote_port = 10712
+
+[unix_domain]
+type = tcp
+remote_port = 10704
+plugin = unix_domain_socket
+plugin_unix_path = /tmp/frp_echo_server.sock

tests/echo_server.go

@@ -4,12 +4,15 @@ import (
 	"bufio"
 	"fmt"
 	"io"
+	"net"
+	"os"
+	"syscall"
 
-	"github.com/fatedier/frp/utils/net"
+	frpNet "github.com/fatedier/frp/utils/net"
 )
 
 func StartEchoServer() {
-	l, err := net.ListenTcp("127.0.0.1", 10701)
+	l, err := frpNet.ListenTcp("127.0.0.1", 10701)
 	if err != nil {
 		fmt.Printf("echo server listen error: %v\n", err)
 		return
@@ -27,7 +30,7 @@ func StartEchoServer() {
 }
 
 func StartUdpEchoServer() {
-	l, err := net.ListenUDP("127.0.0.1", 10703)
+	l, err := frpNet.ListenUDP("127.0.0.1", 10703)
 	if err != nil {
 		fmt.Printf("udp echo server listen error: %v\n", err)
 		return
@@ -44,6 +47,27 @@ func StartUdpEchoServer() {
 	}
 }
 
+func StartUnixDomainServer() {
+	unixPath := "/tmp/frp_echo_server.sock"
+	os.Remove(unixPath)
+	syscall.Umask(0)
+	l, err := net.Listen("unix", unixPath)
+	if err != nil {
+		fmt.Printf("unix domain server listen error: %v\n", err)
+		return
+	}
+
+	for {
+		c, err := l.Accept()
+		if err != nil {
+			fmt.Printf("unix domain server accept error: %v\n", err)
+			return
+		}
+
+		go echoWorker(c)
+	}
+}
+
 func echoWorker(c net.Conn) {
 	br := bufio.NewReader(c)
 	for {

tests/func_test.go

@@ -26,6 +26,7 @@ func init() {
 	go StartEchoServer()
 	go StartUdpEchoServer()
 	go StartHttpServer()
+	go StartUnixDomainServer()
 	time.Sleep(500 * time.Millisecond)
 }
 
@@ -95,3 +96,24 @@ func TestUdpEchoServer(t *testing.T) {
 		t.Fatalf("message got from udp server error, get %s", string(data[:n-1]))
 	}
 }
+
+func TestUnixDomainServer(t *testing.T) {
+	c, err := frpNet.ConnectTcpServer(fmt.Sprintf("127.0.0.1:%d", 10704))
+	if err != nil {
+		t.Fatalf("connect to echo server error: %v", err)
+	}
+	timer := time.Now().Add(time.Duration(5) * time.Second)
+	c.SetDeadline(timer)
+
+	c.Write([]byte(ECHO_TEST_STR + "\n"))
+
+	br := bufio.NewReader(c)
+	buf, err := br.ReadString('\n')
+	if err != nil {
+		t.Fatalf("read from echo server error: %v", err)
+	}
+
+	if ECHO_TEST_STR != buf {
+		t.Fatalf("content error, send [%s], get [%s]", strings.Trim(ECHO_TEST_STR, "\n"), strings.Trim(buf, "\n"))
+	}
+}