Update README.md

This reverts commit a981e32abe.

.github/ISSUE_TEMPLATE

@@ -1,3 +1,15 @@
+问问题前先搜索ISSUE，并搞清楚下面的问题:
+
+1. 检查 ```-key xxx``` 至少三遍, ***保证***两边一致。
+2. 保证```-nocomp, -datashard, -parityshard,  -key, -crypt```两边一致。
+3. 是否在服务器端，正确设定了转发的目标服务器地址 ***--target***。
+4. 如果第3条不确定，尝试在服务器上telnet target port试试。
+5. 防火墙是否关闭了UDP通信。
+6. 两端的版本是否一致？
+7. 是不是最新版本？
+8. 两端分别是什么操作系统？
+9. 两端的输出日志是什么？
+
 Before firing issue, make sure you figured out the following common questions.
 
 PLEASE DO SEARCH FIRST.
@@ -11,3 +23,5 @@ PLEASE DO SEARCH FIRST.
 7. Are you using the **latest release**?
 8. Which **OS** do you use?
 9. Which end for this issue related to, **client or server**?
+
+

README.en.md

@@ -30,8 +30,8 @@ A tool for converting tcp stream into kcp+udp stream, :zap: ***[download address
 ### *QuickStart* :lollipop:
 Client, server, respectively, download the corresponding platform binary compression package, and extract, through the following command to start port forwarding.
 ```
-Server: ./server_linux_amd64 -t "SERVER_IP:8388" -l ":4000"
-Client: ./client_darwin_amd64 -r "SERVER_IP:4000" -l ":8388"
+Server: ./server_linux_amd64 -t "SERVER_IP:8388" -l ":4000" -mode fast2
+Client: ./client_darwin_amd64 -r "SERVER_IP:4000" -l ":8388" -mode fast2
 ```
 The above command can establish 8388/tcp port forwarding (through 4000/udp port).
 
@@ -109,6 +109,9 @@ GLOBAL OPTIONS:
    --help, -h                show help
    --version, -v             print the version
 ```
+#### *Parameters by Layers* :lollipop:   
+
+<p align="left"><img src="layeredparams.png" alt="params" height="450px"/></p>
 
 ### *Applications* :lollipop:   
 1. Real-time gaming.

README.md

@@ -1,5 +1,5 @@
 <p align="center"><img src="logo.png" alt="kcptun" height="60px" /></p>
-<p align="center"><em>也许是世界上最快的UDP传输工具</em></p>
+<p align="center"><em>A Simple UDP Tunnel Based On KCP</em></p>
 
 -
 
@@ -26,16 +26,24 @@
 <p align="center"><img src="kcptun.png" alt="kcptun" height="200px"/></p>
 <p align="center"><a href="https://github.com/xtaci/kcptun/releases/latest">立即安装</a></p>
 <p align="center"><em>支持macOS/Linux/Windows/FreeBSD/ARM/Raspberry Pi/OpenWrt</em></p>
-<p align="right"><a href="https://github.com/xtaci/kcptun/blob/master/README.en.md">ENG</a></p>
+<p align="right"><a href="https://github.com/xtaci/kcptun/blob/master/README.en.md">ENGLISH VERSION</a></p>
 
 -
+### 手动编译
+```
+$go get -u github.com/xtaci/kcptun/client
+$go get -u github.com/xtaci/kcptun/server
+```
+注意: 如果出现错误提示，请确保依赖库能正确访问到。
+
+Release中的所有二进制版本，是通过 `build-release.sh` 脚本生成并优化。
 
 ### 快速设定
 
 客户端、服务器分别**下载**对应平台的二进制压缩包，并**解压**，通过下面的命令**启动**端口转发。
 ```
-服务器: ./server_linux_amd64 -t "服务器IP地址:8388" -l ":4000"
-客户端: ./client_darwin_amd64 -r "服务器IP地址:4000" -l ":8388"
+服务器: ./server_linux_amd64 -t "服务器IP地址:8388" -l ":4000" -mode fast2
+客户端: ./client_darwin_amd64 -r "服务器IP地址:4000" -l ":8388" -mode fast2
 ```
 以上命令可以实现8388/tcp端口的转发（通过4000/udp端口）。
 
@@ -114,6 +122,19 @@ GLOBAL OPTIONS:
    --help, -h                show help
    --version, -v             print the version
 ```
+#### 分层参数图
+
+<p align="left"><img src="layeredparams.png" alt="params" height="450px"/></p>
+
+**两端参数必须一致的有**:
+
+* datashard --前向纠错
+* parityshard --前向纠错
+* nocomp --压缩
+* key --密钥
+* crypt --加密算法
+
+其余为两边可独立设定的参数
 
 ### 内置模式
 
@@ -121,7 +142,7 @@ GLOBAL OPTIONS:
 *fast3 > fast2 >* **[fast]** *> normal > default*        
 有效载荷比:     
 *default > normal >* **[fast]** *> fast2 > fast3*       
-中间mode参数比较均衡，总之就是越快，包重传越激进。       
+中间-mode参数比较均衡，总之就是越快，包重传越激进。       
 更高级的 **手动档** 需要理解KCP协议，并通过 **隐藏参数** 调整，例如:
 ```
  -mode manual -nodelay 1 -resend 2 -nc 1 -interval 20
@@ -131,6 +152,8 @@ GLOBAL OPTIONS:
 * 搭配2. fast2 + FEC(10,3)
 * 搭配3. fast2 + FEC(0,0)
 
+默认profile参考: https://github.com/xtaci/kcptun/blob/master/client/main.go#L248
+
 ### 前向纠错
 
 前向纠错采用Reed Solomon纠删码, 它的基本原理如下： 给定n个数据块d1, d2,…, dn，n和一个正整数m， RS根据n个数据块生成m个校验块， c1, c2,…, cm。 对于任意的n和m， 从n个原始数据块和m 个校验块中任取n块就能解码出原始数据， 即RS最多**容忍m个数据块或者校验块同时丢失**。
@@ -144,21 +167,10 @@ GLOBAL OPTIONS:
 注意：为了发挥FEC最佳效果，设置 parityshard/(parity+datashard) > packet loss，比如5/(5+5) > 30%
 
 ### 窗口调整
-
-**两端参数必须一致的有**:
-
-* datashard --前向纠错
-* parityshard --前向纠错
-* nocomp --压缩
-* key --密钥
-* crypt --加密算法
-
-其余为两边可独立设定的参数
-
 **简易窗口自我调优方法**：
 
 > 第一步：同时在两端逐步增大client rcvwnd和server sndwnd;        
-> 第二步：尝试下载，观察如果带宽利用率（服务器＋客户端两端都要观察）接近物理带宽则停止，否则跳转到第一步。
+> 第二步：尝试下载，观察如果带宽利用率（服务器＋客户端两端都要观察）到达预期则停止，否则跳转到第一步。
 
 **注意：产生大量重传时，一定是窗口偏大了**
 
@@ -213,6 +225,8 @@ DSCP差分服务代码点（Differentiated Services Code Point），IETF于1998
 
 > Reference: http://google.github.io/snappy/
 
+压缩对于非加密，非压缩的数据能降低传输数据量，比如点对点的HTTP数据转发。
+
 通过参数 ```-nocomp``` 在两端同时设定以关闭压缩。
 > 提示: 关闭压缩可能会降低延迟。
 
@@ -316,7 +330,9 @@ type Snmp struct {
 
 > 郑H立, 南东风, Li, 七七, 凌君, 昶，LesMiserables, KyOn, 噼里啪啦, 继斌, 小苍辛苦, **Ken**, 
 > 乔槁, 佳晨, 猪肉佬, lcx, 昊文, 冰峰, 凡, alex, **海豹叔叔**, 奥姐, 张冰, 司成, 
-> 武子, **慎**，Alex43211，**Coxxs**，荣，NeroNg，吴骁，定一
+> 武子, **慎**，Alex43211，**Coxxs**，荣，NeroNg，吴骁，定一，我不是林J，Patrick, 超, 陈，windfarer, 宇,
+> 今晶，斌，晓东，最后一缕阳光，亮，Ethan，一心不乱，allenm，冬卯，GELATO，用户1，Butterfly，光子曲面，
+> 丞佳，捉鱼，Talon，Biny，李勇，***阿彪***
 
 好人一生平安!
 
@@ -326,6 +342,7 @@ type Snmp struct {
 2. https://github.com/EasyPi/openwrt-kcptun
 3. https://github.com/kuoruan/luci-app-kcptun
 4. https://github.com/dfdragon/kcptun_gclient
+5. https://github.com/dfdragon/kcptun_xclient
 
 ### 参考资料
 

build-release.sh

@@ -12,7 +12,7 @@ fi
 
 VERSION=`date -u +%Y%m%d`
 LDFLAGS="-X main.VERSION=$VERSION -s -w"
-GCFLAGS="-B"
+GCFLAGS=""
 
 OSES=(linux darwin windows freebsd)
 ARCHS=(amd64 386)
@@ -40,3 +40,15 @@ done
 if $UPX; then upx -9 client_linux_arm* server_linux_arm*;fi
 tar -zcf kcptun-linux-arm-$VERSION.tar.gz client_linux_arm* server_linux_arm*
 $MD5 kcptun-linux-arm-$VERSION.tar.gz
+
+#MIPS32LE
+env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mipsle github.com/xtaci/kcptun/client
+env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mipsle github.com/xtaci/kcptun/server
+env CGO_ENABLED=0 GOOS=linux GOARCH=mips go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mips github.com/xtaci/kcptun/client
+env CGO_ENABLED=0 GOOS=linux GOARCH=mips go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mips github.com/xtaci/kcptun/server
+
+if $UPX; then upx -9 client_linux_mips* server_linux_mips*;fi
+tar -zcf kcptun-linux-mipsle-$VERSION.tar.gz client_linux_mipsle server_linux_mipsle
+tar -zcf kcptun-linux-mips-$VERSION.tar.gz client_linux_mips server_linux_mips
+$MD5 kcptun-linux-mipsle-$VERSION.tar.gz
+$MD5 kcptun-linux-mips-$VERSION.tar.gz

client/config.go

@@ -29,6 +29,8 @@ type Config struct {
 	SockBuf      int    `json:"sockbuf"`
 	KeepAlive    int    `json:"keepalive"`
 	Log          string `json:"log"`
+	SnmpLog      string `json:"snmplog"`
+	SnmpPeriod   int    `json:"snmpperiod"`
 }
 
 func parseJSONConfig(config *Config, path string) error {

client/main.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"crypto/sha1"
+	"encoding/csv"
+	"fmt"
 	"io"
 	"log"
 	"math/rand"
@@ -11,7 +13,7 @@ import (
 
 	"golang.org/x/crypto/pbkdf2"
 
-	"github.com/klauspost/compress/snappy"
+	"github.com/golang/snappy"
 	"github.com/pkg/errors"
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
@@ -53,7 +55,12 @@ func newCompStream(conn net.Conn) *compStream {
 	return c
 }
 
-func handleClient(p1, p2 io.ReadWriteCloser) {
+func handleClient(sess *smux.Session, p1 io.ReadWriteCloser) {
+	p2, err := sess.OpenStream()
+	if err != nil {
+		return
+	}
+
 	log.Println("stream opened")
 	defer log.Println("stream closed")
 	defer p1.Close()
@@ -139,7 +146,7 @@ func main() {
 		},
 		cli.IntFlag{
 			Name:  "rcvwnd",
-			Value: 1024,
+			Value: 512,
 			Usage: "set receive window size(num of packets)",
 		},
 		cli.IntFlag{
@@ -196,6 +203,16 @@ func main() {
 			Value:  10, // nat keepalive interval in seconds
 			Hidden: true,
 		},
+		cli.StringFlag{
+			Name:  "snmplog",
+			Value: "",
+			Usage: "collect snmp to file, aware of timeformat in golang, like: ./snmp-20060102.log",
+		},
+		cli.IntFlag{
+			Name:  "snmpperiod",
+			Value: 60,
+			Usage: "snmp collect period, in seconds",
+		},
 		cli.StringFlag{
 			Name:  "log",
 			Value: "",
@@ -231,6 +248,8 @@ func main() {
 		config.SockBuf = c.Int("sockbuf")
 		config.KeepAlive = c.Int("keepalive")
 		config.Log = c.String("log")
+		config.SnmpLog = c.String("snmplog")
+		config.SnmpPeriod = c.Int("snmpperiod")
 
 		if c.String("c") != "" {
 			err := parseJSONConfig(&config, c.String("c"))
@@ -306,6 +325,8 @@ func main() {
 		log.Println("keepalive:", config.KeepAlive)
 		log.Println("conn:", config.Conn)
 		log.Println("autoexpire:", config.AutoExpire)
+		log.Println("snmplog:", config.SnmpLog)
+		log.Println("snmpperiod:", config.SnmpPeriod)
 
 		smuxConfig := smux.DefaultConfig()
 		smuxConfig.MaxReceiveBuffer = config.SockBuf
@@ -371,9 +392,13 @@ func main() {
 
 		chScavenger := make(chan *smux.Session, 128)
 		go scavenger(chScavenger)
+		go snmpLogger(config.SnmpLog, config.SnmpPeriod)
 		rr := uint16(0)
 		for {
 			p1, err := listener.AcceptTCP()
+			if err != nil {
+				log.Fatalln(err)
+			}
 			if err := p1.SetReadBuffer(config.SockBuf); err != nil {
 				log.Println("TCP SetReadBuffer:", err)
 			}
@@ -383,23 +408,14 @@ func main() {
 			checkError(err)
 			idx := rr % numconn
 
-		OPEN_P2:
-			// do auto expiration
-			if config.AutoExpire > 0 && time.Now().After(muxes[idx].ttl) {
+			// do auto expiration && reconnection
+			if muxes[idx].session.IsClosed() || (config.AutoExpire > 0 && time.Now().After(muxes[idx].ttl)) {
 				chScavenger <- muxes[idx].session
 				muxes[idx].session = waitConn()
 				muxes[idx].ttl = time.Now().Add(time.Duration(config.AutoExpire) * time.Second)
 			}
 
-			// do session open
-			p2, err := muxes[idx].session.OpenStream()
-			if err != nil { // mux failure
-				chScavenger <- muxes[idx].session
-				muxes[idx].session = waitConn()
-				muxes[idx].ttl = time.Now().Add(time.Duration(config.AutoExpire) * time.Second)
-				goto OPEN_P2
-			}
-			go handleClient(p1, p2)
+			go handleClient(muxes[idx].session, p1)
 			rr++
 		}
 	}
@@ -438,3 +454,34 @@ func scavenger(ch chan *smux.Session) {
 		}
 	}
 }
+
+func snmpLogger(path string, interval int) {
+	if path == "" || interval == 0 {
+		return
+	}
+	ticker := time.NewTicker(time.Duration(interval) * time.Second)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			f, err := os.OpenFile(time.Now().Format(path), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+			if err != nil {
+				log.Println(err)
+				return
+			}
+			w := csv.NewWriter(f)
+			// write header in empty file
+			if stat, err := f.Stat(); err == nil && stat.Size() == 0 {
+				if err := w.Write(append([]string{"Unix"}, kcp.DefaultSnmp.Header()...)); err != nil {
+					log.Println(err)
+				}
+			}
+			if err := w.Write(append([]string{fmt.Sprint(time.Now().Unix())}, kcp.DefaultSnmp.ToSlice()...)); err != nil {
+				log.Println(err)
+			}
+			kcp.DefaultSnmp.Reset()
+			w.Flush()
+			f.Close()
+		}
+	}
+}

server/config.go

@@ -27,6 +27,8 @@ type Config struct {
 	SockBuf      int    `json:"sockbuf"`
 	KeepAlive    int    `json:"keepalive"`
 	Log          string `json:"log"`
+	SnmpLog      string `json:"snmplog"`
+	SnmpPeriod   int    `json:"snmpperiod"`
 }
 
 func parseJSONConfig(config *Config, path string) error {

server/main.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"crypto/sha1"
+	"encoding/csv"
+	"fmt"
 	"io"
 	"log"
 	"math/rand"
@@ -11,7 +13,7 @@ import (
 
 	"golang.org/x/crypto/pbkdf2"
 
-	"github.com/klauspost/compress/snappy"
+	"github.com/golang/snappy"
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
 	"github.com/xtaci/smux"
@@ -218,6 +220,16 @@ func main() {
 			Value:  10, // nat keepalive interval in seconds
 			Hidden: true,
 		},
+		cli.StringFlag{
+			Name:  "snmplog",
+			Value: "",
+			Usage: "collect snmp to file, aware of timeformat in golang, like: ./snmp-20060102.log",
+		},
+		cli.IntFlag{
+			Name:  "snmpperiod",
+			Value: 60,
+			Usage: "snmp collect period, in seconds",
+		},
 		cli.StringFlag{
 			Name:  "log",
 			Value: "",
@@ -251,6 +263,8 @@ func main() {
 		config.SockBuf = c.Int("sockbuf")
 		config.KeepAlive = c.Int("keepalive")
 		config.Log = c.String("log")
+		config.SnmpLog = c.String("snmplog")
+		config.SnmpPeriod = c.Int("snmpperiod")
 
 		if c.String("c") != "" {
 			//Now only support json config file
@@ -322,6 +336,8 @@ func main() {
 		log.Println("dscp:", config.DSCP)
 		log.Println("sockbuf:", config.SockBuf)
 		log.Println("keepalive:", config.KeepAlive)
+		log.Println("snmplog:", config.SnmpLog)
+		log.Println("snmpperiod:", config.SnmpPeriod)
 
 		if err := lis.SetDSCP(config.DSCP); err != nil {
 			log.Println("SetDSCP:", err)
@@ -332,6 +348,8 @@ func main() {
 		if err := lis.SetWriteBuffer(config.SockBuf); err != nil {
 			log.Println("SetWriteBuffer:", err)
 		}
+
+		go snmpLogger(config.SnmpLog, config.SnmpPeriod)
 		for {
 			if conn, err := lis.AcceptKCP(); err == nil {
 				log.Println("remote address:", conn.RemoteAddr())
@@ -354,3 +372,34 @@ func main() {
 	}
 	myApp.Run(os.Args)
 }
+
+func snmpLogger(path string, interval int) {
+	if path == "" || interval == 0 {
+		return
+	}
+	ticker := time.NewTicker(time.Duration(interval) * time.Second)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			f, err := os.OpenFile(time.Now().Format(path), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+			if err != nil {
+				log.Println(err)
+				return
+			}
+			w := csv.NewWriter(f)
+			// write header in empty file
+			if stat, err := f.Stat(); err == nil && stat.Size() == 0 {
+				if err := w.Write(append([]string{"Unix"}, kcp.DefaultSnmp.Header()...)); err != nil {
+					log.Println(err)
+				}
+			}
+			if err := w.Write(append([]string{fmt.Sprint(time.Now().Unix())}, kcp.DefaultSnmp.ToSlice()...)); err != nil {
+				log.Println(err)
+			}
+			kcp.DefaultSnmp.Reset()
+			w.Flush()
+			f.Close()
+		}
+	}
+}