add salsa20, xtea crypto

This reverts commit 003617186b.

.github/ISSUE_TEMPLATE

@@ -0,0 +1,13 @@
+Before firing issue, make sure you figured out the following common questions.
+
+PLEASE DO SEARCH FIRST.
+
+1. Check your ```-key xxx``` for at least 3 times, ***MAKE SURE*** both sides share the same secret.
+2. ```-nocomp, -datashard, -parityshard,  -key, -crypt``` ***must be the same*** on both side.
+3. Did you correctly set the ***-target*** on the server side?
+4. ***MAKE SURE*** ```telnet target port``` on your server successful(don't ask me why couldn't).
+5. Does your ***firewall allows UDP*** communications? (including your ISP Cable-Modem)
+6. Are you using the **same version** for both client & server
+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

@@ -1,7 +1,7 @@
 # <img src="logo.png" alt="kcptun" height="60px" /> 
-[![GoDoc][1]][2] [![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Gitter][19]][20]
-[1]: https://godoc.org/github.com/xtaci/kcptun?status.svg
-[2]: https://godoc.org/github.com/xtaci/kcptun
+[![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Gitter][19]][20] [![Docker][1]][2]
+[1]: https://images.microbadger.com/badges/image/xtaci/kcptun.svg
+[2]: https://microbadger.com/images/xtaci/kcptun
 [3]: https://travis-ci.org/xtaci/kcptun.svg?branch=master
 [4]: https://travis-ci.org/xtaci/kcptun
 [5]: https://goreportcard.com/badge/github.com/xtaci/kcptun
@@ -29,8 +29,8 @@ A tool for converting tcp stream into kcp+udp stream, :zap: ***[download address
 
 ### *QuickStart* :lollipop:
 ```
-Server Side: ./server_linux_amd64 -t "127.0.0.1:1080" -l ":554" -mode fast2  // forwarding to local port 1080
-Client Side: ./client_darwin_amd64 -r "SERVERIP:554" -l ":1080" -mode fast2  // listening on port 1080
+Server Side: ./server_linux_amd64 -t "127.0.0.1:1080" -l ":4000" -mode fast2  // forwarding to local port 1080
+Client Side: ./client_darwin_amd64 -r "SERVERIP:4000" -l ":1080" -mode fast2  // listening on port 1080
 ```
 
 ### *Performance* :lollipop:
@@ -40,20 +40,83 @@ Client Side: ./client_darwin_amd64 -r "SERVERIP:554" -l ":1080" -mode fast2  //
 * WIFI: 5GHz TL-WDR3320
 
 ### *Usage* :lollipop:
-![client](client.png)
-![server](server.png)
+Help output under MacOS X:
+```
+$ ./client_darwin_amd64 -h
+NAME:
+   kcptun - kcptun client
+
+USAGE:
+   client_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160819
+
+COMMANDS:
+     help, h  Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --localaddr value, -l value   local listen address (default: ":12948")
+   --remoteaddr value, -r value  kcp server address (default: "vps:29900")
+   --key value                   pre-shared secret for client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value                 aes, aes-128, aes-192, blowfish, cast5, 3des, tea, xor, none (default: "aes")
+   --mode value                  profiles: fast3, fast2, fast, normal (default: "fast")
+   --conn value                  set num of UDP connections to server (default: 1)
+   --mtu value                   set maximum transmission unit of UDP packets (default: 1350)
+   --sndwnd value                set send window size(num of packets) (default: 128)
+   --rcvwnd value                set receive window size(num of packets) (default: 1024)
+   --datashard value             set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value           set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value                  set DSCP(6bit) (default: 0)
+   --nocomp                      disable compression
+   --help, -h                    show help
+   --version, -v                 print the version
+
+
+$ ./server_darwin_amd64 -h
+NAME:
+   kcptun - kcptun server
+
+USAGE:
+   server_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160819
+
+COMMANDS:
+     help, h  Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --listen value, -l value  kcp server listen address (default: ":29900")
+   --target value, -t value  target server address (default: "127.0.0.1:12948")
+   --key value               pre-shared secret for client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value             aes, aes-128, aes-192, blowfish, cast5, 3des, tea, xor, none (default: "aes")
+   --mode value              profiles: fast3, fast2, fast, normal (default: "fast")
+   --mtu value               set maximum transmission unit of UDP packets (default: 1350)
+   --sndwnd value            set send window size(num of packets) (default: 1024)
+   --rcvwnd value            set receive window size(num of packets) (default: 1024)
+   --datashard value         set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value       set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value              set DSCP(6bit) (default: 0)
+   --nocomp                  disable compression
+   --help, -h                show help
+   --version, -v             print the version
+```
 
 ### *Applications* :lollipop:   
 1. Real-time gaming.
 2. Cross-ISP data exchange in PRC.
 3. Other lossy network.
 
-### *Parameters Recommended* :lollipop: 
-```
-Test Environment: China Telecom 100M ADSL(100mbps up/8mbps down)
-SERVER:   -mtu 1400 -sndwnd 2048 -rcvwnd 2048 -mode fast2
-CLIENT:   -mtu 1400 -sndwnd 256 -rcvwnd 2048 -mode fast2 -dscp 46
-```
+### *Parameters* :lollipop: 
+***Both sides must agree on the following parameters:***
+* datashard
+* parityshard
+* nocomp
+* key
+* crypt
+
+other parameters can be set independently.
 
 *How to optimize*：
 > Step 1：Increase client rcvwnd & server sndwnd simultaneously & gradually。       
@@ -61,6 +124,16 @@ CLIENT:   -mtu 1400 -sndwnd 256 -rcvwnd 2048 -mode fast2 -dscp 46
 
 ***NOTICE: if too much retranmission happens, it's quite possible the windows are too large***
 
+### *Security* :lollipop: 
+No matter what encryption you are using for application layer, if you specify ```-crypt none``` to kcptun, 
+the header will be ***PLAINTEXT*** to everyone; I suggest ```-crypt aes-128``` for encryption at least .
+
+NOTICE: ```-crypt xor``` is also insecure, do not use this unless you know what you are doing.
+
+### *Memory Control* :lollipop: 
+Routers, mobile devices are sensitive to memory consumption; by setting GOGC environment(eg: GOGC=20) will lower memory consumption.
+Reference: https://blog.golang.org/go15gc
+
 ### *Traffic Control* :lollipop: 
 ***Intended audience : for those server's bandwidth is quite limited.***      
 
@@ -92,6 +165,7 @@ Manual control is supported with hidden parameters, you must understand KCP prot
 ```
  -mode manual -nodelay 1 -resend 2 -nc 1 -interval 20
 ```
+I suggest fast2 for high-loss network, normal for low-loss network.
 
 ### *Forward Error Correction* :lollipop: 
 In coding theory, the Reed–Solomon code belongs to the class of non-binary cyclic error-correcting codes. The Reed–Solomon code is based on univariate polynomials over finite fields.

README.md

@@ -1,7 +1,7 @@
 # <img src="logo.png" alt="kcptun" height="60px" /> 
-[![GoDoc][1]][2] [![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Gitter][19]][20]
-[1]: https://godoc.org/github.com/xtaci/kcptun?status.svg
-[2]: https://godoc.org/github.com/xtaci/kcptun
+[![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Gitter][19]][20] [![Docker][1]][2]
+[1]: https://images.microbadger.com/badges/image/xtaci/kcptun.svg
+[2]: https://microbadger.com/images/xtaci/kcptun
 [3]: https://travis-ci.org/xtaci/kcptun.svg?branch=master
 [4]: https://travis-ci.org/xtaci/kcptun
 [5]: https://goreportcard.com/badge/github.com/xtaci/kcptun
@@ -25,8 +25,8 @@
 [English Readme](README.en.md)
 ### *快速设定* :lollipop:
 ```
-服务器: ./server_linux_amd64 -t "127.0.0.1:8388" -l ":554" -mode fast2  // 转发到服务器的本地8388端口
-客户端: ./client_darwin_amd64 -r "服务器IP地址:554" -l ":8388" -mode fast2    // 监听客户端的本地8388端口
+服务器: ./server_linux_amd64 -t "127.0.0.1:8388" -l ":4000" -mode fast2  // 转发到服务器的本地8388端口
+客户端: ./client_darwin_amd64 -r "服务器IP地址:4000" -l ":8388" -mode fast2    // 监听客户端的本地8388端口
 注: 服务器端需要有服务监听8388端口
 ```
 
@@ -38,21 +38,70 @@
 
 ### *使用方法* :lollipop:
 在Mac OS X El Capitan下的帮助输出: 
-
-![client](client.png)
-![server](server.png)
-
-### *推荐参数* :lollipop: 
 ```
-适用大部分ADSL接入（非对称上下行）的参数（实验环境电信100M ADSL）
-其它带宽请按比例调整，比如 50M ADSL，把 CLIENT 的 -sndwnd -rcvwnd 减掉一半，SERVER 不变
+$ ./client_darwin_amd64 -h
+NAME:
+   kcptun - kcptun client
 
-SERVER:   -mtu 1400 -sndwnd 2048 -rcvwnd 2048 -mode fast2
-CLIENT:   -mtu 1400 -sndwnd 256 -rcvwnd 2048 -mode fast2 -dscp 46
-*巭孬嫑乱动* 
+USAGE:
+   client_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160819
+
+COMMANDS:
+     help, h  Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --localaddr value, -l value   local listen address (default: ":12948")
+   --remoteaddr value, -r value  kcp server address (default: "vps:29900")
+   --key value                   pre-shared secret for client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value                 aes, aes-128, aes-192, blowfish, cast5, 3des, tea, xor, none (default: "aes")
+   --mode value                  profiles: fast3, fast2, fast, normal (default: "fast")
+   --conn value                  set num of UDP connections to server (default: 1)
+   --mtu value                   set maximum transmission unit of UDP packets (default: 1350)
+   --sndwnd value                set send window size(num of packets) (default: 128)
+   --rcvwnd value                set receive window size(num of packets) (default: 1024)
+   --datashard value             set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value           set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value                  set DSCP(6bit) (default: 0)
+   --nocomp                      disable compression
+   --help, -h                    show help
+   --version, -v                 print the version
+
+
+$ ./server_darwin_amd64 -h
+NAME:
+   kcptun - kcptun server
+
+USAGE:
+   server_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160819
+
+COMMANDS:
+     help, h  Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --listen value, -l value  kcp server listen address (default: ":29900")
+   --target value, -t value  target server address (default: "127.0.0.1:12948")
+   --key value               pre-shared secret for client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value             aes, aes-128, aes-192, blowfish, cast5, 3des, tea, xor, none (default: "aes")
+   --mode value              profiles: fast3, fast2, fast, normal (default: "fast")
+   --mtu value               set maximum transmission unit of UDP packets (default: 1350)
+   --sndwnd value            set send window size(num of packets) (default: 1024)
+   --rcvwnd value            set receive window size(num of packets) (default: 1024)
+   --datashard value         set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value       set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value              set DSCP(6bit) (default: 0)
+   --nocomp                  disable compression
+   --help, -h                show help
+   --version, -v             print the version
 ```
 
-两端参数必须一致的有:
+### *参数调整* :lollipop: 
+***两端参数必须一致的有:***
 * datashard
 * parityshard
 * nocomp
@@ -92,6 +141,15 @@ CLIENT:   -mtu 1400 -sndwnd 256 -rcvwnd 2048 -mode fast2 -dscp 46
 		max_bandwidth_fec = max_bandwidth * (10 + 3) /10 = 1.3*max_bandwidth ＝ 1.3 * 25Mbps = 32.5Mbps
 ```
 
+### *安全* :lollipop: 
+无论你上层如何加密，如果```-crypt none```，那么协议头部都是***明文***的，建议至少采用```-crypt aes-128```加密。
+
+注意: ```-crypt xor``` 也是不安全的，除非你知道你在做什么。
+
+### *内存控制* :lollipop: 
+路由器，手机等嵌入式设备通常对内存用量敏感，通过调节环境变量GOGC（例如GOGC=20)后启动client，可以降低内存使用。      
+参考：https://blog.golang.org/go15gc
+
 ### *流量控制* :lollipop: 
 ***必要性: 针对流量敏感的服务器，做双保险。***      
 
@@ -147,6 +205,7 @@ DSCP差分服务代码点（Differentiated Services Code Point），IETF于1998
 ```
  -mode manual -nodelay 1 -resend 2 -nc 1 -interval 20
 ```
+高丢包率的网络建议采用fast2, 低丢包率的网络，建议采用normal。
 
 ### *SNMP* :lollipop:
 ```go
@@ -197,7 +256,7 @@ type Snmp struct {
 
 对该项目的捐款将用于[gonet/2](http://gonet2.github.io/)游戏服务器框架的研发。     
 
-> 特别感谢: 郑H立, 南D风, Li, 七q, 凌J，昶，Les*ables, Ky*n等，名字已做特殊处理。
+```特别感谢: 郑H立, 南D风, Li, 七q, 凌J，昶，Les*ables, Ky*n, 噼**啦, 等，名字已做特殊处理。```
 
 ### *参考资料* :paperclip:
 1. https://github.com/skywind3000/kcp -- KCP - A Fast and Reliable ARQ Protocol.

build-release.sh

@@ -12,6 +12,7 @@ fi
 
 VERSION=`date -u +%Y%m%d`
 LDFLAGS="-X main.VERSION=$VERSION -s -w"
+GCFLAGS="-B"
 
 OSES=(linux darwin windows freebsd)
 ARCHS=(amd64 386)
@@ -22,8 +23,8 @@ for os in ${OSES[@]}; do
 		then
 			suffix=".exe"
 		fi
-		env CGO_ENABLED=0 GOOS=$os GOARCH=$arch go build -ldflags "$LDFLAGS" -o client_${os}_${arch}${suffix} github.com/xtaci/kcptun/client
-		env CGO_ENABLED=0 GOOS=$os GOARCH=$arch go build -ldflags "$LDFLAGS" -o server_${os}_${arch}${suffix} github.com/xtaci/kcptun/server
+		env CGO_ENABLED=0 GOOS=$os GOARCH=$arch go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_${os}_${arch}${suffix} github.com/xtaci/kcptun/client
+		env CGO_ENABLED=0 GOOS=$os GOARCH=$arch go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_${os}_${arch}${suffix} github.com/xtaci/kcptun/server
 		if $UPX; then upx -9 client_${os}_${arch}${suffix} server_${os}_${arch}${suffix};fi
 		tar -zcf kcptun-${os}-${arch}-$VERSION.tar.gz client_${os}_${arch}${suffix} server_${os}_${arch}${suffix}
 		$MD5 kcptun-${os}-${arch}-$VERSION.tar.gz
@@ -33,8 +34,8 @@ done
 # ARM
 ARMS=(5 6 7)
 for v in ${ARMS[@]}; do
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -o client_linux_arm$v  github.com/xtaci/kcptun/client
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -o server_linux_arm$v  github.com/xtaci/kcptun/server
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_arm$v  github.com/xtaci/kcptun/client
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_arm$v  github.com/xtaci/kcptun/server
 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*

client/main.go

@@ -87,6 +87,10 @@ func checkError(err error) {
 
 func main() {
 	rand.Seed(int64(time.Now().Nanosecond()))
+	if VERSION == "SELFBUILD" {
+		// add more log flags for debugging
+		log.SetFlags(log.LstdFlags | log.Lshortfile)
+	}
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"
 	myApp.Usage = "kcptun client"
@@ -105,28 +109,28 @@ func main() {
 		cli.StringFlag{
 			Name:   "key",
 			Value:  "it's a secrect",
-			Usage:  "key for communcation, must be the same as kcptun server",
+			Usage:  "pre-shared secret for client and server",
 			EnvVar: "KCPTUN_KEY",
 		},
 		cli.StringFlag{
 			Name:  "crypt",
 			Value: "aes",
-			Usage: "methods for encryption: aes, tea, xor, none",
+			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none",
 		},
 		cli.StringFlag{
 			Name:  "mode",
 			Value: "fast",
-			Usage: "mode for communication: fast3, fast2, fast, normal",
+			Usage: "profiles: fast3, fast2, fast, normal",
 		},
 		cli.IntFlag{
 			Name:  "conn",
 			Value: 1,
-			Usage: "establish N physical connections as specified by 'conn' to server",
+			Usage: "set num of UDP connections to server",
 		},
 		cli.IntFlag{
 			Name:  "mtu",
 			Value: 1350,
-			Usage: "set MTU of UDP packets, suggest 'tracepath' to discover path mtu",
+			Usage: "set maximum transmission unit of UDP packets",
 		},
 		cli.IntFlag{
 			Name:  "sndwnd",
@@ -138,10 +142,6 @@ func main() {
 			Value: 1024,
 			Usage: "set receive window size(num of packets)",
 		},
-		cli.BoolFlag{
-			Name:  "nocomp",
-			Usage: "disable compression",
-		},
 		cli.IntFlag{
 			Name:  "datashard",
 			Value: 10,
@@ -162,6 +162,10 @@ func main() {
 			Value: 0,
 			Usage: "set DSCP(6bit)",
 		},
+		cli.BoolFlag{
+			Name:  "nocomp",
+			Usage: "disable compression",
+		},
 		cli.IntFlag{
 			Name:   "nodelay",
 			Value:  0,
@@ -224,7 +228,24 @@ func main() {
 			block, _ = kcp.NewSimpleXORBlockCrypt(pass)
 		case "none":
 			block, _ = kcp.NewNoneBlockCrypt(pass)
+		case "aes-128":
+			block, _ = kcp.NewAESBlockCrypt(pass[:16])
+		case "aes-192":
+			block, _ = kcp.NewAESBlockCrypt(pass[:24])
+		case "blowfish":
+			block, _ = kcp.NewBlowfishBlockCrypt(pass)
+		case "twofish":
+			block, _ = kcp.NewTwofishBlockCrypt(pass)
+		case "cast5":
+			block, _ = kcp.NewCast5BlockCrypt(pass[:16])
+		case "3des":
+			block, _ = kcp.NewTripleDESBlockCrypt(pass[:24])
+		case "xtea":
+			block, _ = kcp.NewXTEABlockCrypt(pass[:16])
+		case "salsa20":
+			block, _ = kcp.NewSalsa20BlockCrypt(pass)
 		default:
+			crypt = "aes"
 			block, _ = kcp.NewAESBlockCrypt(pass)
 		}
 
@@ -248,6 +269,14 @@ func main() {
 		log.Println("keepalive:", keepalive)
 		log.Println("conn:", conn)
 
+		config := &yamux.Config{
+			AcceptBacklog:          256,
+			EnableKeepAlive:        true,
+			KeepAliveInterval:      30 * time.Second,
+			ConnectionWriteTimeout: 10 * time.Second,
+			MaxStreamWindowSize:    uint32(sockbuf),
+			LogOutput:              os.Stderr,
+		}
 		createConn := func() *yamux.Session {
 			kcpconn, err := kcp.DialWithOptions(remoteaddr, block, datashard, parityshard)
 			checkError(err)
@@ -269,14 +298,6 @@ func main() {
 			}
 
 			// stream multiplex
-			config := &yamux.Config{
-				AcceptBacklog:          256,
-				EnableKeepAlive:        true,
-				KeepAliveInterval:      30 * time.Second,
-				ConnectionWriteTimeout: 30 * time.Second,
-				MaxStreamWindowSize:    uint32(sockbuf),
-				LogOutput:              os.Stderr,
-			}
 			var session *yamux.Session
 			if nocomp {
 				session, err = yamux.Client(kcpconn, config)
@@ -302,8 +323,8 @@ func main() {
 			if err != nil { // yamux failure
 				log.Println(err)
 				p1.Close()
-				mux.Close()
 				muxes[rr%numconn] = createConn()
+				mux.Close()
 				continue
 			}
 			go handleClient(p1, p2)

server/main.go

@@ -55,13 +55,11 @@ func newCompStream(conn net.Conn) *compStream {
 // handle multiplex-ed connection
 func handleMux(conn io.ReadWriteCloser, target string, config *yamux.Config) {
 	// stream multiplex
-	var mux *yamux.Session
-	m, err := yamux.Server(conn, config)
+	mux, err := yamux.Server(conn, config)
 	if err != nil {
 		log.Println(err)
 		return
 	}
-	mux = m
 	defer mux.Close()
 
 	for {
@@ -107,6 +105,10 @@ func handleClient(p1, p2 io.ReadWriteCloser) {
 
 func main() {
 	rand.Seed(int64(time.Now().Nanosecond()))
+	if VERSION == "SELFBUILD" {
+		// add more log flags for debugging
+		log.SetFlags(log.LstdFlags | log.Lshortfile)
+	}
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"
 	myApp.Usage = "kcptun server"
@@ -125,23 +127,23 @@ func main() {
 		cli.StringFlag{
 			Name:   "key",
 			Value:  "it's a secrect",
-			Usage:  "key for communcation, must be the same as kcptun client",
+			Usage:  "pre-shared secret for client and server",
 			EnvVar: "KCPTUN_KEY",
 		},
 		cli.StringFlag{
 			Name:  "crypt",
 			Value: "aes",
-			Usage: "methods for encryption: aes, tea, xor, none",
+			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none",
 		},
 		cli.StringFlag{
 			Name:  "mode",
 			Value: "fast",
-			Usage: "mode for communication: fast3, fast2, fast, normal",
+			Usage: "profiles: fast3, fast2, fast, normal",
 		},
 		cli.IntFlag{
 			Name:  "mtu",
 			Value: 1350,
-			Usage: "set MTU of UDP packets, suggest 'tracepath' to discover path mtu",
+			Usage: "set maximum transmission unit of UDP packets",
 		},
 		cli.IntFlag{
 			Name:  "sndwnd",
@@ -153,10 +155,6 @@ func main() {
 			Value: 1024,
 			Usage: "set receive window size(num of packets)",
 		},
-		cli.BoolFlag{
-			Name:  "nocomp",
-			Usage: "disable compression",
-		},
 		cli.IntFlag{
 			Name:  "datashard",
 			Value: 10,
@@ -177,6 +175,10 @@ func main() {
 			Value: 0,
 			Usage: "set DSCP(6bit)",
 		},
+		cli.BoolFlag{
+			Name:  "nocomp",
+			Usage: "disable compression",
+		},
 		cli.IntFlag{
 			Name:   "nodelay",
 			Value:  0,
@@ -232,7 +234,24 @@ func main() {
 			block, _ = kcp.NewSimpleXORBlockCrypt(pass)
 		case "none":
 			block, _ = kcp.NewNoneBlockCrypt(pass)
+		case "aes-128":
+			block, _ = kcp.NewAESBlockCrypt(pass[:16])
+		case "aes-192":
+			block, _ = kcp.NewAESBlockCrypt(pass[:24])
+		case "blowfish":
+			block, _ = kcp.NewBlowfishBlockCrypt(pass)
+		case "twofish":
+			block, _ = kcp.NewTwofishBlockCrypt(pass)
+		case "cast5":
+			block, _ = kcp.NewCast5BlockCrypt(pass[:16])
+		case "3des":
+			block, _ = kcp.NewTripleDESBlockCrypt(pass[:24])
+		case "xtea":
+			block, _ = kcp.NewXTEABlockCrypt(pass[:16])
+		case "salsa20":
+			block, _ = kcp.NewSalsa20BlockCrypt(pass)
 		default:
+			crypt = "aes"
 			block, _ = kcp.NewAESBlockCrypt(pass)
 		}
 
@@ -272,7 +291,7 @@ func main() {
 			AcceptBacklog:          256,
 			EnableKeepAlive:        true,
 			KeepAliveInterval:      30 * time.Second,
-			ConnectionWriteTimeout: 30 * time.Second,
+			ConnectionWriteTimeout: 10 * time.Second,
 			MaxStreamWindowSize:    uint32(sockbuf),
 			LogOutput:              os.Stderr,
 		}