Merge branch 'master' of https://github.com/xtaci/kcptun

optimized xor doesn't need -B flag for bce
Update README.en.md
2024-04-21 12:32:32 +00:00 · 2016-11-10 20:36:39 +08:00 · 2016-11-10 20:35:33 +08:00 · 2016-11-04 10:56:03 +08:00 · 2016-11-04 10:55:36 +08:00 · 2016-11-01 13:47:57 +08:00
22 changed files with 653 additions and 798 deletions
@@ -1,15 +1,3 @@
-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.
@@ -23,5 +11,3 @@ 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**?
-
-
@@ -1,8 +1,6 @@
 language: go
 go:
-    - 1.9.x
-    - 1.10.x
-    - 1.11.x
+    - 1.6
 before_install:
    - go get github.com/mattn/goveralls
    - go get golang.org/x/tools/cmd/cover
@@ -1,11 +1,8 @@
-FROM golang:alpine as builder
+FROM golang:alpine
 MAINTAINER xtaci <daniel820313@gmail.com>
 RUN apk update && \
    apk upgrade && \
    apk add git
-RUN go get -ldflags "-X main.VERSION=$(date -u +%Y%m%d) -s -w" github.com/xtaci/kcptun/client && go get -ldflags "-X main.VERSION=$(date -u +%Y%m%d) -s -w" github.com/xtaci/kcptun/server
-
-FROM alpine:3.9
-COPY --from=builder /go/bin /bin
+RUN go get github.com/xtaci/kcptun/client && go get github.com/xtaci/kcptun/server
 EXPOSE 29900/udp
 EXPOSE 12948
@@ -0,0 +1,250 @@
+# <img src="logo.png" alt="kcptun" height="60px" /> 
+[![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
+[6]: https://goreportcard.com/report/github.com/xtaci/kcptun
+[7]: https://img.shields.io/badge/license-MIT-blue.svg
+[8]: https://raw.githubusercontent.com/xtaci/kcptun/master/LICENSE.md
+[9]: https://img.shields.io/github/stars/xtaci/kcptun.svg
+[10]: https://github.com/xtaci/kcptun/stargazers
+[11]: https://img.shields.io/badge/license-MIT-blue.svg
+[12]: LICENSE.md
+[13]: https://img.shields.io/github/release/xtaci/kcptun.svg
+[14]: https://github.com/xtaci/kcptun/releases/latest
+[15]: https://img.shields.io/github/downloads/xtaci/kcptun/total.svg?maxAge=1800
+[16]: https://github.com/xtaci/kcptun/releases
+[17]: https://img.shields.io/badge/KCP-Powered-blue.svg
+[18]: https://github.com/skywind3000/kcp
+[19]: https://badges.gitter.im/xtaci/kcptun.svg
+[20]: https://gitter.im/xtaci/kcptun?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge
+
+A tool for converting tcp stream into kcp+udp stream, :zap: ***[download address](https://github.com/xtaci/kcptun/releases/latest)***:zap:
+
+![kcptun](kcptun.png)
+
+***kcptun is based on [kcp-go](https://github.com/xtaci/kcp-go)***   
+
+### *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" -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).
+
+
+### *Performance* :lollipop:
+<img src="fast.png" alt="fast.com" height="256px" />       
+* Speed tested with: https://fast.com
+* WAN Link Speed: 100M ADSL
+* WIFI: 5GHz TL-WDR3320
+
+### *Usage* :lollipop:
+Help output under MacOS X:
+```
+$ ./client_darwin_amd64 -h
+NAME:
+   kcptun - client(with SMUX)
+
+USAGE:
+   client_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160922
+
+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 between client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value                 aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none (default: "aes")
+   --mode value                  profiles: fast3, fast2, fast, normal (default: "fast")
+   --conn value                  set num of UDP connections to server (default: 1)
+   --autoexpire value            set auto expiration time(in seconds) for a single UDP connection, 0 to disable (default: 0)
+   --mtu value                   set maximum transmission unit for UDP packets (default: 1350)
+   --sndwnd value                set send window size(num of packets) (default: 128)
+   --rcvwnd value                set receive window size(num of packets) (default: 1024)
+   --datashard value             set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value           set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value                  set DSCP(6bit) (default: 0)
+   --nocomp                      disable compression
+   --log value                   specify a log file to output, default goes to stderr
+   -c value                      config from json file, which will override the command from shell
+   --help, -h                    show help
+   --version, -v                 print the version
+
+$ ./server_darwin_amd64 -h
+NAME:
+   kcptun - server(with SMUX)
+
+USAGE:
+   server_darwin_amd64 [global options] command [command options] [arguments...]
+
+VERSION:
+   20160922
+
+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 between client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value             aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none (default: "aes")
+   --mode value              profiles: fast3, fast2, fast, normal (default: "fast")
+   --mtu value               set maximum transmission unit for 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
+   --log value               specify a log file to output, default goes to stderr
+   -c value                  config from json file, which will override the command from shell
+   --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.
+2. Cross-ISP data exchange in PRC.
+3. Other lossy network.
+
+### *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。       
+> Step 2：Try download something and observer, if the bandwidth usage is close the limit then stop, otherwise goto step 1.     
+
+***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.***      
+
+Example: To limit outgoing bandwidth to 32mbit/s on server. 
+```
+root@kcptun:~# cat tc.sh
+tc qdisc del dev eth0 root
+tc qdisc add dev eth0 root handle 1: htb
+tc class add dev eth0 parent 1: classid 1:1 htb rate 32mbit
+tc filter add dev eth0 protocol ip parent 1:0 prio 1 handle 10 fw flowid 1:1
+iptables -t mangle -A POSTROUTING -o eth0  -j MARK --set-mark 10
+root@kcptun:~#
+```
+
+### *DSCP* :lollipop: 
+Differentiated services or DiffServ is a computer networking architecture that specifies a simple, scalable and coarse-grained mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks. DiffServ can, for example, be used to provide low-latency to critical network traffic such as voice or streaming media while providing simple best-effort service to non-critical services such as web traffic or file transfers.
+
+DiffServ uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. The DS field and ECN field replace the outdated IPv4 TOS field.[1]
+
+setting each side with ```-dscp value```.
+
+### *Embeded Mode* :lollipop: 
+Latency:     
+*fast3 >* ***[fast2]*** *> fast > normal > default*        
+Payload Ratio:     
+*default > normal > fast >* ***[fast2]*** *> fast3*       
+Parameters in middle is balanced for latency & payload ratio, the faster you get the more wasteful you are.
+Manual control is supported with hidden parameters, you must understand KCP protocol before doing this.
+```
+ -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.
+
+It is able to detect and correct multiple symbol errors. By adding t check symbols to the data, a Reed–Solomon code can detect any combination of up to t erroneous symbols, or correct up to ⌊t/2⌋ symbols. As an erasure code, it can correct up to t known erasures, or it can detect and correct combinations of errors and erasures. Furthermore, Reed–Solomon codes are suitable as multiple-burst bit-error correcting codes, since a sequence of b + 1 consecutive bit errors can affect at most two symbols of size b. The choice of t is up to the designer of the code, and may be selected within wide limits.
+
+![reed-solomon](rs.png)
+
+Setting parameters of RS-Code with ```-datashard m -parityshard n```
+
+### *Snappy Stream Compression* :lollipop: 
+> Snappy is a compression/decompression library. It does not aim for maximum
+> compression, or compatibility with any other compression library; instead,
+> it aims for very high speeds and reasonable compression. For instance,
+> compared to the fastest mode of zlib, Snappy is an order of magnitude faster
+> for most inputs, but the resulting compressed files are anywhere from 20% to
+> 100% bigger.
+
+> Reference: http://google.github.io/snappy/
+
+disable compression by setting ```-nocomp``` on both side.
+
+> Tips: Turning off compression may reduce latency.
+
+### *SNMP* :lollipop:
+```go
+// Snmp defines network statistics indicator
+type Snmp struct {
+	BytesSent        uint64 // payload bytes sent
+	BytesReceived    uint64
+	MaxConn          uint64
+	ActiveOpens      uint64
+	PassiveOpens     uint64
+	CurrEstab        uint64
+	InErrs           uint64
+	InCsumErrors     uint64 // checksum errors
+	InSegs           uint64
+	OutSegs          uint64
+	OutBytes         uint64 // udp bytes sent
+	RetransSegs      uint64
+	FastRetransSegs  uint64
+	EarlyRetransSegs uint64
+	LostSegs         uint64
+	RepeatSegs       uint64
+	FECRecovered     uint64
+	FECErrs          uint64
+	FECSegs          uint64 // fec segments received
+}
+```
+
+Sending a signal by ```kill -SIGUSR1 pid``` will give SNMP information for KCP，useful for fine-grained adjustment.
+Of which ```RetransSegs,FastRetransSegs,LostSegs,OutSegs``` is the most useful.
+
+### *Donations* :dollar:
+![donate](donate.png)          
+
+Best wishes to you all.
+
+### *References* :paperclip:
+1. https://github.com/skywind3000/kcp -- KCP - A Fast and Reliable ARQ Protocol.
+2. https://github.com/klauspost/reedsolomon -- Reed-Solomon Erasure Coding in Go.
+3. https://en.wikipedia.org/wiki/Differentiated_services -- DSCP.
+4. http://google.github.io/snappy/ -- A fast compressor/decompressor.
+5. https://www.backblaze.com/blog/reed-solomon/ -- Reed-Solomon Explained.
+6. http://www.qualcomm.cn/products/raptorq -- RaptorQ Forward Error Correction Scheme for Object Delivery.
+7. https://en.wikipedia.org/wiki/PBKDF2 -- Key stretching.
+8. http://blog.appcanary.com/2016/encrypt-or-compress.html -- Should you encrypt or compress first?
+9. https://github.com/hashicorp/yamux -- Connection multiplexing library.
+10. https://tools.ietf.org/html/rfc6937 -- Proportional Rate Reduction for TCP.
+11. https://tools.ietf.org/html/rfc5827 -- Early Retransmit for TCP and Stream Control Transmission Protocol (SCTP).
+12. http://http2.github.io/ -- What is HTTP/2?
+13. http://www.lartc.org/ -- Linux Advanced Routing & Traffic Control
@@ -1,7 +1,9 @@
-# <img src="logo.png" alt="kcptun" height="54px" /> 
+<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>

-[![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Docker][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] [![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
@@ -18,265 +20,194 @@
 [16]: https://github.com/xtaci/kcptun/releases
 [17]: https://img.shields.io/badge/KCP-Powered-blue.svg
 [18]: https://github.com/skywind3000/kcp
+[19]: https://badges.gitter.im/xtaci/kcptun.svg
+[20]: https://gitter.im/xtaci/kcptun?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge

-<img src="kcptun.png" alt="kcptun" height="300px"/>
+<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>

-> *Disclaimer: kcptun maintains a single website — [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun). Any websites other than [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun) are not endorsed by xtaci.*
+-

-### QuickStart
-
-Increase the number of open files on your server, as:
-
-`ulimit -n 65535`, or write it in `~/.bashrc`.
-
-Suggested `sysctl.conf` parameters for better handling of UDP packets:
+### 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。
 ```
-net.core.rmem_max=26214400 // BDP - bandwidth delay product
-net.core.rmem_default=26214400
-net.core.wmem_max=26214400
-net.core.wmem_default=26214400
-net.core.netdev_max_backlog=2048 // proportional to -rcvwnd
+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）。

-You can also increase the per-socket buffer by adding parameter(default 4MB):
+### 速度对比
+
+<img src="fast.png" alt="fast.com" height="256px" />       
+* 测速网站: https://fast.com
+* 接入速度: 100Mbps
+* WIFI: 5GHz TL-WDR3320
+
+### 使用方法
+
+在Mac OS X El Capitan下的帮助输出，注意默认值: 
 ```
-sockbuf 16777217
-```
-for **slow processors**, increasing this buffer is **CRITICAL** to receive packets properly.
-
-Download a corresponding one from precompiled [Releases](https://github.com/xtaci/kcptun/releases).
-
-```
-KCP Client: ./client_darwin_amd64 -r "KCP_SERVER_IP:4000" -l ":8388" -mode fast3 -nocomp -autoexpire 900 -sockbuf 16777217 -dscp 46
-KCP Server: ./server_linux_amd64 -t "TARGET_IP:8388" -l ":4000" -mode fast3 -nocomp -sockbuf 16777217 -dscp 46
-```
-The above commands will establish port forwarding channel for 8388/tcp as:
-
-> Application -> **KCP Client(8388/tcp) -> KCP Server(4000/udp)** -> Target Server(8388/tcp) 
-
-which tunnels the original connection:
-
-> Application -> Target Server(8388/tcp) 
-
-### Install from source
-
-```
-$go get -u github.com/xtaci/kcptun/...
-```
-
-All precompiled releases are genereated from `build-release.sh` script.
-
-### Performance
-
-<img src="fast.png" alt="fast.com" height="256px" />    
-
-<img src="bw.png" alt="bandwidth usage graph" height="256px" />       
-
-> Practical bandwidth graph with parameters:  -mode fast3 -ds 10 -ps 3
-
-### Basic Tuning Guide
-
-#### Improving Thoughput
-
-> **Q: I have a high speed network link, how to reach the maximum bandwidth?**        
-
-> **A:** Increase `-rcvwnd` on KCP Client and `-sndwnd` on KCP Server **simultaneously & gradually**, the mininum one decides the maximum transfer rate of the link, as `wnd * mtu / rtt`; Then try downloading something and to see if it meets your requirements. 
-(mtu is adjustable by `-mtu`)
-
-#### Improving Latency
-
-> **Q: I'm using kcptun for game, I don't want any lag happening.**    
-
-> **A:** Lag means packet loss for most of the time, lags can be improved by changing `-mode`.
-
-> eg: `-mode fast3`    
-
-> Aggresiveness/Responsiveness on retransmission for embeded modes are:
-
-> *fast3 > fast2 > fast > normal > default*
-
-#### HOLB
-
-Since streams are multiplexed into a single physical channel, head of line blocking may appear under certain circumstances, by
-increasing `-smuxbuf` to a larger value (default 4MB) may mitigate this problem, obviously this will costs more memory.
-
-#### Slow Devices
-
-kcptun made use of **ReedSolomon-Codes** to recover lost packets, which requires massive amount of computation, a low-end ARM device cannot satisfy kcptun well. To unleash the full potential of kcptun, a multi-core x86 homeserver CPU like AMD Opteron is recommended.
-If you insist on running under some ARM routers, you'd better turn off `FEC` and use `salsa20` as the encryption method.
-
-### Expert Tuning Guide
-
-#### Overview
-
-<p align="left"><img src="layeredparams.png" alt="params" height="450px"/></p>
-
-#### Usage
-
-```
-xtaci@gw:~$ ./client_linux_amd64 -h
+$ ./client_darwin_amd64 -h
 NAME:
   kcptun - client(with SMUX)

 USAGE:
-   client_linux_amd64 [global options] command [command options] [arguments...]
+   client_darwin_amd64 [global options] command [command options] [arguments...]

 VERSION:
-   20190409
+   20161025

 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 between client and server (default: "it's a secrect") [$KCPTUN_KEY]
-   --crypt value                    aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none (default: "aes")
-   --mode value                     profiles: fast3, fast2, fast, normal, manual (default: "fast")
-   --conn value                     set num of UDP connections to server (default: 1)
-   --autoexpire value               set auto expiration time(in seconds) for a single UDP connection, 0 to disable (default: 0)
-   --scavengettl value              set how long an expired connection can live(in sec), -1 to disable (default: 600)
-   --mtu value                      set maximum transmission unit for 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: 512)
-   --datashard value, --ds value    set reed-solomon erasure coding - datashard (default: 10)
-   --parityshard value, --ps value  set reed-solomon erasure coding - parityshard (default: 3)
-   --dscp value                     set DSCP(6bit) (default: 0)
-   --nocomp                         disable compression
-   --sockbuf value                  per-socket buffer in bytes (default: 4194304)
-   --smuxbuf value                  the overall de-mux buffer in bytes (default: 4194304)
-   --keepalive value                seconds between heartbeats (default: 10)
-   --snmplog value                  collect snmp to file, aware of timeformat in golang, like: ./snmp-20060102.log
-   --snmpperiod value               snmp collect period, in seconds (default: 60)
-   --log value                      specify a log file to output, default goes to stderr
-   --quiet                          to suppress the 'stream open/close' messages
-   -c value                         config from json file, which will override the command from shell
-   --help, -h                       show help
-   --version, -v                    print the version
-   
-xtaci@gw:~$ ./server_linux_amd64 -h
+   --localaddr value, -l value   local listen address (default: ":12948")
+   --remoteaddr value, -r value  kcp server address (default: "vps:29900")
+   --key value                   pre-shared secret between client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value                 aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none (default: "aes")
+   --mode value                  profiles: fast3, fast2, fast, normal (default: "fast")
+   --conn value                  set num of UDP connections to server (default: 1)
+   --autoexpire value            set auto expiration time(in seconds) for a single UDP connection, 0 to disable (default: 0)
+   --mtu value                   set maximum transmission unit for UDP packets (default: 1350)
+   --sndwnd value                set send window size(num of packets) (default: 128)
+   --rcvwnd value                set receive window size(num of packets) (default: 1024)
+   --datashard value             set reed-solomon erasure coding - datashard (default: 10)
+   --parityshard value           set reed-solomon erasure coding - parityshard (default: 3)
+   --dscp value                  set DSCP(6bit) (default: 0)
+   --nocomp                      disable compression
+   --log value                   specify a log file to output, default goes to stderr
+   -c value                      config from json file, which will override the command from shell
+   --help, -h                    show help
+   --version, -v                 print the version
+
+$ ./server_darwin_amd64 -h
 NAME:
   kcptun - server(with SMUX)

 USAGE:
-   server_linux_amd64 [global options] command [command options] [arguments...]
+   server_darwin_amd64 [global options] command [command options] [arguments...]

 VERSION:
-   20190409
+   20161025

 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 between client and server (default: "it's a secrect") [$KCPTUN_KEY]
-   --crypt value                    aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none (default: "aes")
-   --mode value                     profiles: fast3, fast2, fast, normal, manual (default: "fast")
-   --mtu value                      set maximum transmission unit for 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, --ds value    set reed-solomon erasure coding - datashard (default: 10)
-   --parityshard value, --ps value  set reed-solomon erasure coding - parityshard (default: 3)
-   --dscp value                     set DSCP(6bit) (default: 0)
-   --nocomp                         disable compression
-   --sockbuf value                  per-socket buffer in bytes (default: 4194304)
-   --smuxbuf value                  the overall de-mux buffer in bytes (default: 4194304)
-   --keepalive value                seconds between heartbeats (default: 10)
-   --snmplog value                  collect snmp to file, aware of timeformat in golang, like: ./snmp-20060102.log
-   --snmpperiod value               snmp collect period, in seconds (default: 60)
-   --pprof                          start profiling server on :6060
-   --log value                      specify a log file to output, default goes to stderr
-   --quiet                          to suppress the 'stream open/close' messages
-   -c value                         config from json file, which will override the command from shell
-   --help, -h                       show help
-   --version, -v                    print the version
+   --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 between client and server (default: "it's a secrect") [$KCPTUN_KEY]
+   --crypt value             aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none (default: "aes")
+   --mode value              profiles: fast3, fast2, fast, normal (default: "fast")
+   --mtu value               set maximum transmission unit for 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
+   --log value               specify a log file to output, default goes to stderr
+   -c value                  config from json file, which will override the command from shell
+   --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>
+
+### 内置模式
+
+响应速度:     
+*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。       
+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
 ```

-#### Forward Error Correction
+* 搭配1. fast + FEC(5,5)
+* 搭配2. fast2 + FEC(10,3)
+* 搭配3. fast2 + FEC(0,0)

-In coding theory, the [Reed–Solomon code](https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction) belongs to the class of non-binary cyclic error-correcting codes. The Reed–Solomon code is based on univariate polynomials over finite fields.
+默认profile参考: https://github.com/xtaci/kcptun/blob/master/client/main.go#L248

-It is able to detect and correct multiple symbol errors. By adding t check symbols to the data, a Reed–Solomon code can detect any combination of up to t erroneous symbols, or correct up to ⌊t/2⌋ symbols. As an erasure code, it can correct up to t known erasures, or it can detect and correct combinations of errors and erasures. Furthermore, Reed–Solomon codes are suitable as multiple-burst bit-error correcting codes, since a sequence of b + 1 consecutive bit errors can affect at most two symbols of size b. The choice of t is up to the designer of the code, and may be selected within wide limits.
+### 前向纠错

-![FED](FEC.png)
+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**。

-Setting parameters of RS-Code with ```-datashard m -parityshard n``` on **BOTH** KCP Client & KCP Server **MUST** be **IDENTICAL**.
+![reed-solomon](rs.png)

-#### DSCP
+通过参数```-datashard n -parityshard m``` 在两端同时设定。

-Differentiated services or DiffServ is a computer networking architecture that specifies a simple, scalable and coarse-grained mechanism for classifying and managing network traffic and providing quality of service (QoS) on modern IP networks. DiffServ can, for example, be used to provide low-latency to critical network traffic such as voice or streaming media while providing simple best-effort service to non-critical services such as web traffic or file transfers.
+数据包发送顺序严格遵循: n个datashard紧接m个parityshard，重复。

-DiffServ uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. The DS field and ECN field replace the outdated IPv4 TOS field.
+注意：为了发挥FEC最佳效果，设置 parityshard/(parity+datashard) > packet loss，比如5/(5+5) > 30%

-setting each side with ```-dscp value```, Here are some [Commonly used DSCP values](https://en.wikipedia.org/wiki/Differentiated_services#Commonly_used_DSCP_values).
+### 窗口调整

-#### Cryptanalysis
+**两端参数必须一致的有**:

-kcptun is shipped with builtin packet encryption powered by various block encryption algorithms and works in [Cipher Feedback Mode](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_Feedback_(CFB)), for each packet to be sent, the encryption process will start from encrypting a [nonce](https://en.wikipedia.org/wiki/Cryptographic_nonce) from the [system entropy](https://en.wikipedia.org/wiki//dev/random), so encryption to same plaintexts never leads to a same ciphertexts thereafter.
+* datashard --前向纠错
+* parityshard --前向纠错
+* nocomp --压缩
+* key --密钥
+* crypt --加密算法

-The contents of the packets are completely anonymous with encryption, including the headers(FEC,KCP), checksums and contents. Note that, no matter which encryption method you choose on you upper layer, if you disable encryption by specifying `-crypt none` to kcptun, the transmit will be insecure somehow, since the header is ***PLAINTEXT*** to everyone it would be susceptible to header tampering, such as jamming the *sliding window size*, *round-trip time*, *FEC property* and *checksums*. ```aes-128``` is suggested for minimal encryption since modern CPUs are shipped with [AES-NI](https://en.wikipedia.org/wiki/AES_instruction_set) instructions and performs even better than `salsa20`(check the table below).
+其余为两边可独立设定的参数

-Other possible attacks to kcptun includes: a) [traffic analysis](https://en.wikipedia.org/wiki/Traffic_analysis), dataflow on specific websites may have pattern while interchanging data, but this type of eavesdropping has been mitigated by adapting [smux](https://github.com/xtaci/smux) to mix data streams so as to introduce noises, perfect solution to this has not appeared yet, theroretically by shuffling/mixing messages on larger scale network may mitigate this problem.  b) [replay attack](https://en.wikipedia.org/wiki/Replay_attack), since the asymmetrical encryption has not been introduced into kcptun for some reason, capturing the packets and replay them on a different machine is possible, (notice: hijacking the session and decrypting the contents is still *impossible*), so upper layers should contain a asymmetrical encryption system to guarantee the authenticity of each message(to process message exactly once), such as HTTPS/OpenSSL/LibreSSL, only by signing the requests with private keys can eliminate this type of attack. 
+**简易窗口自我调优方法**：

-Important: 
-1. `-crypt` and `-key` must be the same on both KCP Client & KCP Server.
-2. `-crypt xor` is also insecure and vulnerable to [known-plaintext attack](https://en.wikipedia.org/wiki/Known-plaintext_attack), do not use this unless you know what you are doing. (*cryptanalysis note: any type of [counter mode](https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Counter_(CTR)) is insecure in packet encryption due to the shorten of counter period and leads to iv/nonce collision*)
+> 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。

-Benchmarks for crypto algorithms supported by kcptun:
+**注意：产生大量重传时，一定是窗口偏大了**
+
+### 安全
+
+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，并修改密码。
+
+密码可以通过`-key`指定，也可以通过环境变量`KCPTUN_KEY`指定。
+
+注意: ```-crypt xor``` 也是不安全的，除非你知道你在做什么。 
+
+附加密速度Benchmark：

 ```
-BenchmarkSM4-4                 	   50000	     32087 ns/op	  93.49 MB/s	       0 B/op	       0 allocs/op
-BenchmarkAES128-4              	  500000	      3274 ns/op	 916.15 MB/s	       0 B/op	       0 allocs/op
-BenchmarkAES192-4              	  500000	      3587 ns/op	 836.34 MB/s	       0 B/op	       0 allocs/op
-BenchmarkAES256-4              	  300000	      3828 ns/op	 783.60 MB/s	       0 B/op	       0 allocs/op
-BenchmarkTEA-4                 	  100000	     15359 ns/op	 195.32 MB/s	       0 B/op	       0 allocs/op
-BenchmarkXOR-4                 	20000000	        90.2 ns/op	33249.02 MB/s	       0 B/op	       0 allocs/op
-BenchmarkBlowfish-4            	   50000	     26885 ns/op	 111.58 MB/s	       0 B/op	       0 allocs/op
-BenchmarkNone-4                	30000000	        45.8 ns/op	65557.11 MB/s	       0 B/op	       0 allocs/op
-BenchmarkCast5-4               	   50000	     34370 ns/op	  87.29 MB/s	       0 B/op	       0 allocs/op
-Benchmark3DES-4                	   10000	    117893 ns/op	  25.45 MB/s	       0 B/op	       0 allocs/op
-BenchmarkTwofish-4             	   50000	     33477 ns/op	  89.61 MB/s	       0 B/op	       0 allocs/op
-BenchmarkXTEA-4                	   30000	     45825 ns/op	  65.47 MB/s	       0 B/op	       0 allocs/op
-BenchmarkSalsa20-4             	  500000	      3282 ns/op	 913.90 MB/s	       0 B/op	       0 allocs/op
+BenchmarkAES128-4      	  200000	     11182 ns/op
+BenchmarkAES192-4      	  200000	     12699 ns/op
+BenchmarkAES256-4      	  100000	     13757 ns/op
+BenchmarkTEA-4         	   50000	     26441 ns/op
+BenchmarkSimpleXOR-4   	 3000000	       441 ns/op
+BenchmarkBlowfish-4    	   30000	     48036 ns/op
+BenchmarkNone-4        	20000000	       106 ns/op
+BenchmarkCast5-4       	   20000	     60222 ns/op
+BenchmarkTripleDES-4   	    2000	    878759 ns/op
+BenchmarkTwofish-4     	   20000	     68501 ns/op
+BenchmarkXTEA-4        	   20000	     77417 ns/op
+BenchmarkSalsa20-4     	  300000	      4998 ns/op
 ```

-Benchmark result from openssl
+### 内存控制

-```
-$ openssl speed -evp aes-128-cfb
-Doing aes-128-cfb for 3s on 16 size blocks: 157794127 aes-128-cfb's in 2.98s
-Doing aes-128-cfb for 3s on 64 size blocks: 39614018 aes-128-cfb's in 2.98s
-Doing aes-128-cfb for 3s on 256 size blocks: 9971090 aes-128-cfb's in 2.99s
-Doing aes-128-cfb for 3s on 1024 size blocks: 2510877 aes-128-cfb's in 2.99s
-Doing aes-128-cfb for 3s on 8192 size blocks: 310865 aes-128-cfb's in 2.98s
-OpenSSL 1.0.2p  14 Aug 2018
-built on: reproducible build, date unspecified
-options:bn(64,64) rc4(ptr,int) des(idx,cisc,16,int) aes(partial) idea(int) blowfish(idx)
-compiler: clang -I. -I.. -I../include  -fPIC -fno-common -DOPENSSL_PIC -DOPENSSL_THREADS -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -arch x86_64 -O3 -DL_ENDIAN -Wall -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DWHIRLPOOL_ASM -DGHASH_ASM -DECP_NISTZ256_ASM
-The 'numbers' are in 1000s of bytes per second processed.
-type             16 bytes     64 bytes    256 bytes   1024 bytes   8192 bytes
-aes-128-cfb     847216.79k   850770.86k   853712.05k   859912.39k   854565.80k
-```
-
-The encrytion performance in kcptun is as fast as in openssl library(if not faster).
+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


-#### Memory Control
+### DSCP

-Routers, mobile devices are susceptible to memory consumption; by setting GOGC environment(eg: GOGC=20) will make the garbage collector to recycle faster.
-Reference: https://blog.golang.org/go15gc
+DSCP差分服务代码点（Differentiated Services Code Point），IETF于1998年12月发布了Diff-Serv（Differentiated Service）的QoS分类标准。它在每个数据包IP头部的服务类别TOS标识字节中，利用已使用的**6比特**和未使用的2比特，通过编码值来区分优先级。     
+常用DSCP值可以参考[Wikipedia DSCP](https://en.wikipedia.org/wiki/Differentiated_services#Commonly_used_DSCP_values)，至于有没有用，完全取决于数据包经过的设备。 

-Primary memory allocation are done from a global buffer pool *xmit.Buf*, in kcp-go, when we need to allocate some bytes, we can get from that pool, and a *fixed-capacity* 1500 bytes(mtuLimit) will be returned, the *rx queue*, *tx queue* and *fec queue* all receive bytes from there, and they will return the bytes to the pool after using to prevent *unnecessary zer0ing* of bytes. 
-The pool mechanism maintained a *high watermark* for slice objects, these *in-flight* objects from the pool will survive from the perodical garbage collection, meanwhile the pool kept the ability to return the memory to runtime if in idle, `-sndwnd`,`-rcvwnd`,`-ds`, `-ps`, these parameters affect this *high watermark*, the larger the value, the bigger the memory consumption will be.
+通过 ```-dscp ``` 参数指定dscp值，两端可分别设定。

-`-smuxbuf` also affects the maximum memory consumption, this parameter maintains a subtle balance between *concurrency* and *resource*, you can increase this value(default 4MB) to boost concurrency if you have many clients to serve and you get a powerful server at the same time, and also you can decrease this value to serve only 1 or 2 clients and hope this program can run under some embeded SoC system with limited memory and only you can access. (Notice that the `-smuxbuf` value is not proprotional to concurrency, you need to test.)
+注意：设置dscp不一定会更好，需要尝试。

-
-#### Compression
-
-kcptun has builtin snappy algorithms for compressing streams:
+### Snappy数据流压缩

 > Snappy is a compression/decompression library. It does not aim for maximum
 > compression, or compatibility with any other compression library; instead,
@@ -287,87 +218,133 @@ kcptun has builtin snappy algorithms for compressing streams:

 > Reference: http://google.github.io/snappy/

-Compression may save bandwidth for **PLAINTEXT** data, it's quite useful for specific scenarios as cross-datacenter replications, by compressing the redologs in dbms or kafka-like message queues and then transfer the data streams across the continent can be much faster.
+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。

-Compression is enabled by default, you can disable it by setting ```-nocomp``` on **BOTH** KCP Client & KCP Server **MUST** be **IDENTICAL**.
+### 流量控制

-#### SNMP
+**必要性: 针对流量敏感的服务器，做双保险。**      
+
+> 基本原则: SERVER的发送速率不能超过ADSL下行带宽，否则只会浪费您的服务器带宽。  
+
+在server通过linux tc，可以限制服务器发送带宽。   
+举例:  用linux tc限制server发送带宽为32mbit/s: 
+```
+root@kcptun:~# cat tc.sh
+tc qdisc del dev eth0 root
+tc qdisc add dev eth0 root handle 1: htb
+tc class add dev eth0 parent 1: classid 1:1 htb rate 32mbit
+tc filter add dev eth0 protocol ip parent 1:0 prio 1 handle 10 fw flowid 1:1
+iptables -t mangle -A POSTROUTING -o eth0  -j MARK --set-mark 10
+root@kcptun:~#
+```
+其中eth0为网卡，有些服务器为ens3，有些为p2p1，通过ifconfig查询修改。
+
+### SNMP

 ```go
 // Snmp defines network statistics indicator
 type Snmp struct {
-    BytesSent        uint64 // raw bytes sent
-    BytesReceived    uint64
-    MaxConn          uint64
-    ActiveOpens      uint64
-    PassiveOpens     uint64
-    CurrEstab        uint64 // count of connections for now
-    InErrs           uint64 // udp read errors
-    InCsumErrors     uint64 // checksum errors from CRC32
-    KCPInErrors      uint64 // packet iput errors from kcp
-    InSegs           uint64
-    OutSegs          uint64
-    InBytes          uint64 // udp bytes received
-    OutBytes         uint64 // udp bytes sent
-    RetransSegs      uint64
-    FastRetransSegs  uint64
-    EarlyRetransSegs uint64
-    LostSegs         uint64 // number of segs infered as lost
-    RepeatSegs       uint64 // number of segs duplicated
-    FECRecovered     uint64 // correct packets recovered from FEC
-    FECErrs          uint64 // incorrect packets recovered from FEC
-    FECSegs          uint64 // FEC segments received
-    FECShortShards   uint64 // number of data shards that's not enough for recovery
+	BytesSent        uint64 // payload bytes sent
+	BytesReceived    uint64
+	MaxConn          uint64
+	ActiveOpens      uint64
+	PassiveOpens     uint64
+	CurrEstab        uint64
+	InErrs           uint64
+	InCsumErrors     uint64 // checksum errors
+	InSegs           uint64
+	OutSegs          uint64
+	OutBytes         uint64 // udp bytes sent
+	RetransSegs      uint64
+	FastRetransSegs  uint64
+	EarlyRetransSegs uint64
+	LostSegs         uint64
+	RepeatSegs       uint64
+	FECRecovered     uint64
+	FECErrs          uint64
+	FECSegs          uint64 // fec segments received
 }
 ```

-Sending a `SIGUSR1` signal to KCP Client or KCP Server will dump SNMP information to console, just like `/proc/net/snmp`. You can use this information to do fine-grained tuning.
+使用```kill -SIGUSR1 pid``` 可以在控制台打印出SNMP信息，通常用于精细调整**当前链路的有效载荷比**。        
+观察```RetransSegs,FastRetransSegs,LostSegs,OutSegs```这几者的数值比例，用于参考调整```-mode manual,fec```的参数。    

-### Manual Control
+#### 带宽计算公式

-https://github.com/skywind3000/kcp/blob/master/README.en.md#protocol-configuration
+```
+在不丢包的情况下，有最大-rcvwnd 个数据包在网络上正在向你传输，以平均数据包大小avgsize计算，在任意时刻，有：     

-`-mode manual -nodelay 1 -interval 20 -resend 2 -nc 1`
+		network_cap = rcvwnd*avgsize

-Low-level KCP configuration can be altered by using manual mode like above, make sure you really **UNDERSTAND** what these means before doing **ANY** manual settings.
+数据流向你，这个值再除以ping值(rtt)，等于最大带宽使用量。

+		max_bandwidth = network_cap/rtt = rcvwnd*avgsize/rtt
+		
+举例，设rcvwnd = 1024, avgsize = 1KB, rtt = 400ms，则：

-### Identical Parmeters
+		max_bandwidth = 1024 * 1KB / 400ms = 2.5MB/s ~= 25Mbps
+		
+（注：以上计算不包括前向纠错的数据量）

-The parameters below **MUST** be **IDENTICAL** on **BOTH** side:
+前向纠错是最大带宽量的一个固定比例增加：

-1. -key
-1. -crypt
-1. -nocomp
-1. -datashard
-1. -parityshard
+		max_bandwidth_fec = max_bandwidth*(datashard+parityshard)/datashard

-### References
+举例，设datashard = 10 , partiyshard = 3，则：
+
+		max_bandwidth_fec = max_bandwidth * (10 + 3) /10 = 1.3*max_bandwidth ＝ 1.3 * 25Mbps = 32.5Mbps
+```
+
+### 故障排除
+
+> Q: 客户端和服务器端**皆无** ```stream opened```信息。       
+> A: 连接客户端程序的端口设置错误。     
+
+> Q: 客户端有 ```stream opened```信息，服务器端没有。     
+> A: 连接服务器的端口设置错误，或者被防火墙拦截。     
+
+> Q: 客户端服务器**皆有** ```stream opened```信息，但无法通信。      
+> A: 上层软件的设定错误。     
+
+### 免责申明
+
+**用户以各种方式使用本软件（包括但不限于修改使用、直接使用、通过第三方使用）的过程中，不得以任何方式利用本软件直接或间接从事违反中国法律、以及社会公德的行为。软件的使用者需对自身行为负责，因使用软件引发的一切纠纷，由使用者承担全部法律及连带责任。作者不承担任何法律及连带责任。**       
+
+**对免责声明的解释、修改及更新权均属于作者本人所有。**
+
+### 捐赠
+
+![donate](donate.png)          
+
+### 特别鸣谢
+
+> 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，我不是林J
+
+好人一生平安!
+
+### 相关软件
+
+1. https://github.com/bettermanbao/openwrt-kcptun
+2. https://github.com/EasyPi/openwrt-kcptun
+3. https://github.com/kuoruan/luci-app-kcptun
+4. https://github.com/dfdragon/kcptun_gclient
+
+### 参考资料

 1. https://github.com/skywind3000/kcp -- KCP - A Fast and Reliable ARQ Protocol.
-1. https://github.com/xtaci/kcp-go/ -- A Production-Grade Reliable-UDP Library for golang
-1. https://github.com/klauspost/reedsolomon -- Reed-Solomon Erasure Coding in Go.
-1. https://en.wikipedia.org/wiki/Differentiated_services -- DSCP.
-1. http://google.github.io/snappy/ -- A fast compressor/decompressor.
-1. https://www.backblaze.com/blog/reed-solomon/ -- Reed-Solomon Explained.
-1. http://www.qualcomm.cn/products/raptorq -- RaptorQ Forward Error Correction Scheme for Object Delivery.
-1. https://en.wikipedia.org/wiki/PBKDF2 -- Key stretching.
-1. http://blog.appcanary.com/2016/encrypt-or-compress.html -- Should you encrypt or compress first?
-1. https://github.com/hashicorp/yamux -- Connection multiplexing library.
-1. https://tools.ietf.org/html/rfc6937 -- Proportional Rate Reduction for TCP.
-1. https://tools.ietf.org/html/rfc5827 -- Early Retransmit for TCP and Stream Control Transmission Protocol (SCTP).
-1. http://http2.github.io/ -- What is HTTP/2?
-1. http://www.lartc.org/ -- Linux Advanced Routing & Traffic Control
-1. https://en.wikipedia.org/wiki/Noisy-channel_coding_theorem -- Noisy channel coding theorem
-
-### Donate 
-
-via Ethereum(ETH): Address: 0x2e4b43ab3d0983da282592571eef61ae5e60f726 , Or scan here:
-
-<img src="0x2e4b43ab3d0983da282592571eef61ae5e60f726.png" alt="kcptun" height="120px" /> 
-
-via WeChat
-
-<img src="wechat_donate.jpg" alt="kcptun" height="120px" /> 
-
-（注意：我没有任何社交网站的账号，请小心骗子。）
+2. https://github.com/klauspost/reedsolomon -- Reed-Solomon Erasure Coding in Go.
+3. https://en.wikipedia.org/wiki/Differentiated_services -- DSCP.
+4. http://google.github.io/snappy/ -- A fast compressor/decompressor.
+5. https://www.backblaze.com/blog/reed-solomon/ -- Reed-Solomon Explained.
+6. http://www.qualcomm.cn/products/raptorq -- RaptorQ Forward Error Correction Scheme for Object Delivery.
+7. https://en.wikipedia.org/wiki/PBKDF2 -- Key stretching.
+8. http://blog.appcanary.com/2016/encrypt-or-compress.html -- Should you encrypt or compress first?
+9. https://github.com/hashicorp/yamux -- Connection multiplexing library.
+10. https://tools.ietf.org/html/rfc6937 -- Proportional Rate Reduction for TCP.
+11. https://tools.ietf.org/html/rfc5827 -- Early Retransmit for TCP and Stream Control Transmission Protocol (SCTP).
+12. http://http2.github.io/ -- What is HTTP/2?
+13. http://www.lartc.org/LARTC-zh_CN.GB2312.pdf -- Linux Advanced Routing & Traffic Control
+14. https://en.wikipedia.org/wiki/Noisy-channel_coding_theorem -- Noisy channel coding theorem
@@ -0,0 +1,42 @@
+#!/bin/bash
+MD5='md5sum'
+unamestr=`uname`
+if [[ "$unamestr" == 'Darwin' ]]; then
+	MD5='md5'
+fi
+
+UPX=false
+if hash upx 2>/dev/null; then
+	UPX=true
+fi
+
+VERSION=`date -u +%Y%m%d`
+LDFLAGS="-X main.VERSION=$VERSION -s -w"
+GCFLAGS=""
+
+OSES=(linux darwin windows freebsd)
+ARCHS=(amd64 386)
+for os in ${OSES[@]}; do
+	for arch in ${ARCHS[@]}; do
+		suffix=""
+		if [ "$os" == "windows" ]
+		then
+			suffix=".exe"
+		fi
+		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
+	done
+done
+
+# ARM
+ARMS=(5 6 7)
+for v in ${ARMS[@]}; do
+	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -gcflags "$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*
+$MD5 kcptun-linux-arm-$VERSION.tar.gz
@@ -1,81 +0,0 @@
-#!/bin/bash
-sum="sha1sum"
-
-echo "If you need reproducible build, export GO111MODULE=on first"
-
-if ! hash sha1sum 2>/dev/null; then
-	if ! hash shasum 2>/dev/null; then
-		echo "I can't see 'sha1sum' or 'shasum'"
-		echo "Please install one of them!"
-		exit
-	fi
-	sum="shasum"
-fi
-
-UPX=false
-if hash upx 2>/dev/null; then
-	UPX=true
-fi
-
-VERSION=`date -u +%Y%m%d`
-LDFLAGS="-X main.VERSION=$VERSION -s -w"
-GCFLAGS=""
-
-# AMD64 
-OSES=(linux darwin windows freebsd)
-for os in ${OSES[@]}; do
-	suffix=""
-	if [ "$os" == "windows" ]
-	then
-		suffix=".exe"
-	fi
-	env CGO_ENABLED=0 GOOS=$os GOARCH=amd64 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_${os}_amd64${suffix} github.com/xtaci/kcptun/client
-	env CGO_ENABLED=0 GOOS=$os GOARCH=amd64 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_${os}_amd64${suffix} github.com/xtaci/kcptun/server
-	if $UPX; then upx -9 client_${os}_amd64${suffix} server_${os}_amd64${suffix};fi
-	tar -zcf kcptun-${os}-amd64-$VERSION.tar.gz client_${os}_amd64${suffix} server_${os}_amd64${suffix}
-	$sum kcptun-${os}-amd64-$VERSION.tar.gz
-done
-
-# 386
-OSES=(linux windows)
-for os in ${OSES[@]}; do
-	suffix=""
-	if [ "$os" == "windows" ]
-	then
-		suffix=".exe"
-	fi
-	env CGO_ENABLED=0 GOOS=$os GOARCH=386 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_${os}_386${suffix} github.com/xtaci/kcptun/client
-	env CGO_ENABLED=0 GOOS=$os GOARCH=386 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_${os}_386${suffix} github.com/xtaci/kcptun/server
-	if $UPX; then upx -9 client_${os}_386${suffix} server_${os}_386${suffix};fi
-	tar -zcf kcptun-${os}-386-$VERSION.tar.gz client_${os}_386${suffix} server_${os}_386${suffix}
-	$sum kcptun-${os}-386-$VERSION.tar.gz
-done
-
-# ARM
-ARMS=(5 6 7)
-for v in ${ARMS[@]}; do
-	env CGO_ENABLED=0 GOOS=linux GOARCH=arm GOARM=$v go build -ldflags "$LDFLAGS" -gcflags "$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
-if $UPX; then upx -9 client_linux_arm$v server_linux_arm$v;fi
-tar -zcf kcptun-linux-arm$v-$VERSION.tar.gz client_linux_arm$v server_linux_arm$v
-$sum kcptun-linux-arm$v-$VERSION.tar.gz
-done
-
-# ARM64
-env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_arm64  github.com/xtaci/kcptun/client
-env CGO_ENABLED=0 GOOS=linux GOARCH=arm64 go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_arm64  github.com/xtaci/kcptun/server
-if $UPX; then upx -9 client_linux_arm64 server_linux_arm64*;fi
-tar -zcf kcptun-linux-arm64-$VERSION.tar.gz client_linux_arm64 server_linux_arm64
-$sum kcptun-linux-arm64-$VERSION.tar.gz
-
-#MIPS32LE
-env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mipsle github.com/xtaci/kcptun/client
-env CGO_ENABLED=0 GOOS=linux GOARCH=mipsle GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o server_linux_mipsle github.com/xtaci/kcptun/server
-env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat go build -ldflags "$LDFLAGS" -gcflags "$GCFLAGS" -o client_linux_mips github.com/xtaci/kcptun/client
-env CGO_ENABLED=0 GOOS=linux GOARCH=mips GOMIPS=softfloat 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-$VERSION.tar.gz client_linux_mips server_linux_mips
-$sum kcptun-linux-mipsle-$VERSION.tar.gz
-$sum kcptun-linux-mips-$VERSION.tar.gz
@@ -14,7 +14,6 @@ type Config struct {
 	Mode         string `json:"mode"`
 	Conn         int    `json:"conn"`
 	AutoExpire   int    `json:"autoexpire"`
-	ScavengeTTL  int    `json:"scavengettl"`
 	MTU          int    `json:"mtu"`
 	SndWnd       int    `json:"sndwnd"`
 	RcvWnd       int    `json:"rcvwnd"`
@@ -28,12 +27,8 @@ type Config struct {
 	Resend       int    `json:"resend"`
 	NoCongestion int    `json:"nc"`
 	SockBuf      int    `json:"sockbuf"`
-	SmuxBuf      int    `json:"smuxbuf"`
 	KeepAlive    int    `json:"keepalive"`
 	Log          string `json:"log"`
-	SnmpLog      string `json:"snmplog"`
-	SnmpPeriod   int    `json:"snmpperiod"`
-	Quiet        bool   `json:"quiet"`
 }

 func parseJSONConfig(config *Config, path string) error {
@@ -2,35 +2,28 @@ package main

 import (
 	"crypto/sha1"
-	"encoding/csv"
-	"fmt"
 	"io"
 	"log"
 	"math/rand"
 	"net"
 	"os"
-	"sync"
 	"time"

 	"golang.org/x/crypto/pbkdf2"

-	"github.com/golang/snappy"
+	"github.com/klauspost/compress/snappy"
 	"github.com/pkg/errors"
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
 	"github.com/xtaci/smux"
-
-	"path/filepath"
 )

-// SALT is use for pbkdf2 key expansion
-const SALT = "kcp-go"
-
-// VERSION is injected by buildflags
-var VERSION = "SELFBUILD"
-
-// A pool for stream copying
-var xmitBuf sync.Pool
+var (
+	// VERSION is injected by buildflags
+	VERSION = "SELFBUILD"
+	// SALT is use for pbkdf2 key expansion
+	SALT = "kcp-go"
+)

 type compStream struct {
 	conn net.Conn
@@ -60,34 +53,23 @@ func newCompStream(conn net.Conn) *compStream {
 	return c
 }

-func handleClient(sess *smux.Session, p1 io.ReadWriteCloser, quiet bool) {
-	if !quiet {
-		log.Println("stream opened")
-		defer log.Println("stream closed")
-	}
-
+func handleClient(p1, p2 io.ReadWriteCloser) {
+	log.Println("stream opened")
+	defer log.Println("stream closed")
 	defer p1.Close()
-	p2, err := sess.OpenStream()
-	if err != nil {
-		return
-	}
 	defer p2.Close()

-	// start tunnel & wait for tunnel termination
-	streamCopy := func(dst io.Writer, src io.Reader) chan struct{} {
-		die := make(chan struct{})
-		go func() {
-			buf := xmitBuf.Get().([]byte)
-			io.CopyBuffer(dst, src, buf)
-			xmitBuf.Put(buf)
-			close(die)
-		}()
-		return die
-	}
+	// start tunnel
+	p1die := make(chan struct{})
+	go func() { io.Copy(p1, p2); close(p1die) }()

+	p2die := make(chan struct{})
+	go func() { io.Copy(p2, p1); close(p2die) }()
+
+	// wait for tunnel termination
 	select {
-	case <-streamCopy(p1, p2):
-	case <-streamCopy(p2, p1):
+	case <-p1die:
+	case <-p2die:
 	}
 }

@@ -104,10 +86,6 @@ func main() {
 		// add more log flags for debugging
 		log.SetFlags(log.LstdFlags | log.Lshortfile)
 	}
-	xmitBuf.New = func() interface{} {
-		return make([]byte, 65535)
-	}
-
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"
 	myApp.Usage = "client(with SMUX)"
@@ -132,12 +110,12 @@ func main() {
 		cli.StringFlag{
 			Name:  "crypt",
 			Value: "aes",
-			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none",
+			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none",
 		},
 		cli.StringFlag{
 			Name:  "mode",
 			Value: "fast",
-			Usage: "profiles: fast3, fast2, fast, normal, manual",
+			Usage: "profiles: fast3, fast2, fast, normal",
 		},
 		cli.IntFlag{
 			Name:  "conn",
@@ -149,11 +127,6 @@ func main() {
 			Value: 0,
 			Usage: "set auto expiration time(in seconds) for a single UDP connection, 0 to disable",
 		},
-		cli.IntFlag{
-			Name:  "scavengettl",
-			Value: 600,
-			Usage: "set how long an expired connection can live(in sec), -1 to disable",
-		},
 		cli.IntFlag{
 			Name:  "mtu",
 			Value: 1350,
@@ -166,16 +139,16 @@ func main() {
 		},
 		cli.IntFlag{
 			Name:  "rcvwnd",
-			Value: 512,
+			Value: 1024,
 			Usage: "set receive window size(num of packets)",
 		},
 		cli.IntFlag{
-			Name:  "datashard,ds",
+			Name:  "datashard",
 			Value: 10,
 			Usage: "set reed-solomon erasure coding - datashard",
 		},
 		cli.IntFlag{
-			Name:  "parityshard,ps",
+			Name:  "parityshard",
 			Value: 3,
 			Usage: "set reed-solomon erasure coding - parityshard",
 		},
@@ -200,7 +173,7 @@ func main() {
 		},
 		cli.IntFlag{
 			Name:   "interval",
-			Value:  50,
+			Value:  40,
 			Hidden: true,
 		},
 		cli.IntFlag{
@@ -214,39 +187,20 @@ func main() {
 			Hidden: true,
 		},
 		cli.IntFlag{
-			Name:  "sockbuf",
-			Value: 4194304, // socket buffer size in bytes
-			Usage: "per-socket buffer in bytes",
+			Name:   "sockbuf",
+			Value:  4194304, // socket buffer size in bytes
+			Hidden: true,
 		},
 		cli.IntFlag{
-			Name:  "smuxbuf",
-			Value: 4194304,
-			Usage: "the overall de-mux buffer in bytes",
-		},
-		cli.IntFlag{
-			Name:  "keepalive",
-			Value: 10, // nat keepalive interval in seconds
-			Usage: "seconds between heartbeats",
-		},
-		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",
+			Name:   "keepalive",
+			Value:  10, // nat keepalive interval in seconds
+			Hidden: true,
 		},
 		cli.StringFlag{
 			Name:  "log",
 			Value: "",
 			Usage: "specify a log file to output, default goes to stderr",
 		},
-		cli.BoolFlag{
-			Name:  "quiet",
-			Usage: "to suppress the 'stream open/close' messages",
-		},
 		cli.StringFlag{
 			Name:  "c",
 			Value: "", // when the value is not empty, the config path must exists
@@ -262,7 +216,6 @@ func main() {
 		config.Mode = c.String("mode")
 		config.Conn = c.Int("conn")
 		config.AutoExpire = c.Int("autoexpire")
-		config.ScavengeTTL = c.Int("scavengettl")
 		config.MTU = c.Int("mtu")
 		config.SndWnd = c.Int("sndwnd")
 		config.RcvWnd = c.Int("rcvwnd")
@@ -276,12 +229,8 @@ func main() {
 		config.Resend = c.Int("resend")
 		config.NoCongestion = c.Int("nc")
 		config.SockBuf = c.Int("sockbuf")
-		config.SmuxBuf = c.Int("smuxbuf")
 		config.KeepAlive = c.Int("keepalive")
 		config.Log = c.String("log")
-		config.SnmpLog = c.String("snmplog")
-		config.SnmpPeriod = c.Int("snmpperiod")
-		config.Quiet = c.Bool("quiet")

 		if c.String("c") != "" {
 			err := parseJSONConfig(&config, c.String("c"))
@@ -298,9 +247,9 @@ func main() {

 		switch config.Mode {
 		case "normal":
-			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 40, 2, 1
-		case "fast":
 			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 30, 2, 1
+		case "fast":
+			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 20, 2, 1
 		case "fast2":
 			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 1, 20, 2, 1
 		case "fast3":
@@ -313,12 +262,9 @@ func main() {
 		listener, err := net.ListenTCP("tcp", addr)
 		checkError(err)

-		log.Println("initiating key derivation")
 		pass := pbkdf2.Key([]byte(config.Key), []byte(SALT), 4096, 32, sha1.New)
 		var block kcp.BlockCrypt
 		switch config.Crypt {
-		case "sm4":
-			block, _ = kcp.NewSM4BlockCrypt(pass[:16])
 		case "tea":
 			block, _ = kcp.NewTEABlockCrypt(pass[:16])
 		case "xor":
@@ -357,18 +303,12 @@ func main() {
 		log.Println("acknodelay:", config.AckNodelay)
 		log.Println("dscp:", config.DSCP)
 		log.Println("sockbuf:", config.SockBuf)
-		log.Println("smuxbuf:", config.SmuxBuf)
 		log.Println("keepalive:", config.KeepAlive)
 		log.Println("conn:", config.Conn)
 		log.Println("autoexpire:", config.AutoExpire)
-		log.Println("scavengettl:", config.ScavengeTTL)
-		log.Println("snmplog:", config.SnmpLog)
-		log.Println("snmpperiod:", config.SnmpPeriod)
-		log.Println("quiet:", config.Quiet)

 		smuxConfig := smux.DefaultConfig()
-		smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-		smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
+		smuxConfig.MaxReceiveBuffer = config.SockBuf

 		createConn := func() (*smux.Session, error) {
 			kcpconn, err := kcp.DialWithOptions(config.RemoteAddr, block, config.DataShard, config.ParityShard)
@@ -376,11 +316,11 @@ func main() {
 				return nil, errors.Wrap(err, "createConn()")
 			}
 			kcpconn.SetStreamMode(true)
-			kcpconn.SetWriteDelay(false)
 			kcpconn.SetNoDelay(config.NoDelay, config.Interval, config.Resend, config.NoCongestion)
 			kcpconn.SetWindowSize(config.SndWnd, config.RcvWnd)
 			kcpconn.SetMtu(config.MTU)
 			kcpconn.SetACKNoDelay(config.AckNodelay)
+			kcpconn.SetKeepAlive(config.KeepAlive)

 			if err := kcpconn.SetDSCP(config.DSCP); err != nil {
 				log.Println("SetDSCP:", err)
@@ -402,7 +342,6 @@ func main() {
 			if err != nil {
 				return nil, errors.Wrap(err, "createConn()")
 			}
-			log.Println("connection:", kcpconn.LocalAddr(), "->", kcpconn.RemoteAddr())
 			return session, nil
 		}

@@ -412,7 +351,6 @@ func main() {
 				if session, err := createConn(); err == nil {
 					return session
 				} else {
-					log.Println("re-connecting:", err)
 					time.Sleep(time.Second)
 				}
 			}
@@ -425,30 +363,43 @@ func main() {
 		}, numconn)

 		for k := range muxes {
-			muxes[k].session = waitConn()
+			sess, err := createConn()
+			checkError(err)
+			muxes[k].session = sess
 			muxes[k].ttl = time.Now().Add(time.Duration(config.AutoExpire) * time.Second)
 		}

 		chScavenger := make(chan *smux.Session, 128)
-		go scavenger(chScavenger, config.ScavengeTTL)
-		go snmpLogger(config.SnmpLog, config.SnmpPeriod)
+		go scavenger(chScavenger)
 		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)
+			}
+			if err := p1.SetWriteBuffer(config.SockBuf); err != nil {
+				log.Println("TCP SetWriteBuffer:", err)
 			}
 			checkError(err)
 			idx := rr % numconn

-			// do auto expiration && reconnection
-			if muxes[idx].session.IsClosed() || (config.AutoExpire > 0 && time.Now().After(muxes[idx].ttl)) {
+		OPEN_P2:
+			// do auto expiration
+			if 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)
 			}

-			go handleClient(muxes[idx].session, p1, config.Quiet)
+			// 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)
 			rr++
 		}
 	}
@@ -457,27 +408,27 @@ func main() {

 type scavengeSession struct {
 	session *smux.Session
-	ts      time.Time
+	ttl     time.Time
 }

-func scavenger(ch chan *smux.Session, ttl int) {
-	ticker := time.NewTicker(time.Second)
+const (
+	maxScavengeTTL = 10 * time.Minute
+)
+
+func scavenger(ch chan *smux.Session) {
+	ticker := time.NewTicker(30 * time.Second)
 	defer ticker.Stop()
 	var sessionList []scavengeSession
 	for {
 		select {
 		case sess := <-ch:
 			sessionList = append(sessionList, scavengeSession{sess, time.Now()})
-			log.Println("session marked as expired")
 		case <-ticker.C:
 			var newList []scavengeSession
 			for k := range sessionList {
 				s := sessionList[k]
-				if s.session.NumStreams() == 0 || s.session.IsClosed() {
-					log.Println("session normally closed")
-					s.session.Close()
-				} else if ttl >= 0 && time.Since(s.ts) >= time.Duration(ttl)*time.Second {
-					log.Println("session reached scavenge ttl")
+				if s.session.NumStreams() == 0 || s.session.IsClosed() || time.Since(s.ttl) > maxScavengeTTL {
+					log.Println("session scavenged")
 					s.session.Close()
 				} else {
 					newList = append(newList, sessionList[k])
@@ -487,37 +438,3 @@ func scavenger(ch chan *smux.Session, ttl int) {
 		}
 	}
 }
-
-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:
-			// split path into dirname and filename
-			logdir, logfile := filepath.Split(path)
-			// only format logfile
-			f, err := os.OpenFile(logdir+time.Now().Format(logfile), 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()
-		}
-	}
-}
@@ -18,7 +18,6 @@ func init() {
 func sigHandler() {
 	ch := make(chan os.Signal, 1)
 	signal.Notify(ch, syscall.SIGUSR1)
-	signal.Ignore(syscall.SIGPIPE)

 	for {
 		switch <-ch {
@@ -1,19 +0,0 @@
-module github.com/xtaci/kcptun
-
-require (
-	github.com/golang/snappy v0.0.1
-	github.com/klauspost/cpuid v1.2.1 // indirect
-	github.com/klauspost/reedsolomon v1.9.1 // indirect
-	github.com/pkg/errors v0.8.1
-	github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
-	github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b // indirect
-	github.com/tjfoc/gmsm v1.0.1 // indirect
-	github.com/urfave/cli v1.20.0
-	github.com/xtaci/kcp-go v5.2.7+incompatible
-	github.com/xtaci/smux v1.2.10
-	golang.org/x/crypto v0.0.0-20190422183909-d864b10871cd
-	golang.org/x/net v0.0.0-20190424112056-4829fb13d2c6 // indirect
-	golang.org/x/sys v0.0.0-20190422165155-953cdadca894 // indirect
-	golang.org/x/text v0.3.1 // indirect
-	golang.org/x/tools v0.0.0-20190424031103-cb2dda6eabdf // indirect
-)
@@ -1,106 +0,0 @@
-github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
-github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
-github.com/klauspost/cpuid v1.2.0 h1:NMpwD2G9JSFOE1/TJjGSo5zG7Yb2bTe7eq1jH+irmeE=
-github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/cpuid v1.2.1 h1:vJi+O/nMdFt0vqm8NZBI6wzALWdA2X+egi0ogNyrC/w=
-github.com/klauspost/cpuid v1.2.1/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/reedsolomon v1.9.1 h1:kYrT1MlR4JH6PqOpC+okdb9CDTcwEC/BqpzK4WFyXL8=
-github.com/klauspost/reedsolomon v1.9.1/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
-github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
-github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
-github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 h1:89CEmDvlq/F7SJEOqkIdNDGJXrQIhuIx9D2DBXjavSU=
-github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161/go.mod h1:wM7WEvslTq+iOEAMDLSzhVuOt5BRZ05WirO+b09GHQU=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b h1:mnG1fcsIB1d/3vbkBak2MM0u+vhGhlQwpeimUi7QncM=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b/go.mod h1:5XA7W9S6mni3h5uvOC75dA3m9CCCaS83lltmc0ukdi4=
-github.com/tjfoc/gmsm v1.0.1 h1:R11HlqhXkDospckjZEihx9SW/2VW0RgdwrykyWMFOQU=
-github.com/tjfoc/gmsm v1.0.1/go.mod h1:XxO4hdhhrzAd+G4CjDqaOkd0hUzmtPR/d3EiBBMn/wc=
-github.com/urfave/cli v1.20.0 h1:fDqGv3UG/4jbVl/QkFwEdddtEDjh/5Ov6X+0B/3bPaw=
-github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
-github.com/xtaci/kcp-go v5.0.7+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.1.1+incompatible h1:A6zXUGblo98vosfEdaHcy0cTBZKY2dByJxICuaV+L5g=
-github.com/xtaci/kcp-go v5.1.1+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.1.2+incompatible h1:UafCgw2Yk3QOf8MRm8jYEWJt1l4J61BgLpMsROkJQxo=
-github.com/xtaci/kcp-go v5.1.2+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.1.3+incompatible h1:s96+ulBrZlxk4DPRPgEGPBV8o55kYKKFVivDwVgZNcA=
-github.com/xtaci/kcp-go v5.1.3+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.1.4+incompatible h1:GHIUAicdHMKwTys8sx2ZnZbFaK8lvmwDniQlFa2BOo4=
-github.com/xtaci/kcp-go v5.1.4+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.1+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.3+incompatible h1:LD/Go8xYxtcyvOvFzeo387BV3UNPcwJvMY+8H+JDhfk=
-github.com/xtaci/kcp-go v5.2.3+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.4+incompatible h1:96bjdOFrUFfU4wYXqGwPJkEOdvnVwciGlAGOHEDpgy8=
-github.com/xtaci/kcp-go v5.2.4+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.5+incompatible h1:9C3xCFYCw6HUMN1/DQhLlUcbx1DmFiLbpiNA/moLYPM=
-github.com/xtaci/kcp-go v5.2.5+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.6+incompatible h1:WokjD7IJJopwivFVIleBjmuHYlhGTlR/JAhCsapl1dk=
-github.com/xtaci/kcp-go v5.2.6+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.2.7+incompatible h1:NkJrwfMj3K6lRHfppR8H+oayahPS6GkGGF4BKiRAiFg=
-github.com/xtaci/kcp-go v5.2.7+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/smux v1.1.1 h1:ZyIo9XHuHkAeENzHR8yGWC+6xUSCTeP2tPTRE8mnLvc=
-github.com/xtaci/smux v1.1.1/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.1.2 h1:AeAzHKqvDeFEcicL9Q06LTjIVW2I55iooUbpDRGHth4=
-github.com/xtaci/smux v1.1.2/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.1/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.2 h1:pF/P78jvAXNG3yddhxKYTXMmNLzxXxdGKKjUBvxF8lk=
-github.com/xtaci/smux v1.2.2/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.3/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.4 h1:l+peIfF3MUC5OmA93nKlezj8Nhejjv76BvnTyQEB2RI=
-github.com/xtaci/smux v1.2.4/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.5 h1:p5K13hQEKeMo/H0XwO7jNxuT2G4/guo7Z7blfxBWBpI=
-github.com/xtaci/smux v1.2.5/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.6 h1:lcooP+CKdWf1IE0d35eJ4MuUt7+kA3hwtQN0uPdd5lo=
-github.com/xtaci/smux v1.2.6/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.7 h1:h7m7UL5zNZRaqEAtFXReqAVuStI3Al85zvJSGxqDqF0=
-github.com/xtaci/smux v1.2.7/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.8 h1:mNFGEdnACCih1aER/JF4JVJIcOl7Mkf5yrQNzdDY6jg=
-github.com/xtaci/smux v1.2.8/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.9 h1:aLBpFdORtDMzFJnrktW5hhe6UScbiS9inicP01KWR7M=
-github.com/xtaci/smux v1.2.9/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-github.com/xtaci/smux v1.2.10 h1:DQiH08XfO+33X7l5XOGV5urQHrgK8PRFWYxT/z9Hrnw=
-github.com/xtaci/smux v1.2.10/go.mod h1:f+nYm6SpuHMy/SH0zpbvAFHT1QoMcgLOsWcFip5KfPw=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576 h1:aUX/1G2gFSs4AsJJg2cL3HuoRhCSCz733FE5GUSuaT4=
-golang.org/x/crypto v0.0.0-20190320223903-b7391e95e576/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c h1:Vj5n4GlwjmQteupaxJ9+0FNOmBrHfq7vN4btdGoDZgI=
-golang.org/x/crypto v0.0.0-20190325154230-a5d413f7728c/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
-golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a h1:Igim7XhdOpBnWPuYJ70XcNpq8q3BCACtVgNfoJxOV7g=
-golang.org/x/crypto v0.0.0-20190411191339-88737f569e3a/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
-golang.org/x/crypto v0.0.0-20190417174047-f416ebab96af h1:6qGQw30u837TXZbCmLFR9AVA+RjJU1LIbvk0oIkDZGY=
-golang.org/x/crypto v0.0.0-20190417174047-f416ebab96af/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
-golang.org/x/crypto v0.0.0-20190418165655-df01cb2cc480 h1:O5YqonU5IWby+w98jVUG9h7zlCWCcH4RHyPVReBmhzk=
-golang.org/x/crypto v0.0.0-20190418165655-df01cb2cc480/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
-golang.org/x/crypto v0.0.0-20190422183909-d864b10871cd h1:sMHc2rZHuzQmrbVoSpt9HgerkXPyIeCSO6k0zUMGfFk=
-golang.org/x/crypto v0.0.0-20190422183909-d864b10871cd/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53 h1:kcXqo9vE6fsZY5X5Rd7R1l7fTgnWaDCVmln65REefiE=
-golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190324223953-e3b2ff56ed87 h1:yh5/K199RObPR6zqVBYf+AyJuweAqx+fOe9s3cekn1Y=
-golang.org/x/net v0.0.0-20190324223953-e3b2ff56ed87/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190328230028-74de082e2cca h1:hyA6yiAgbUwuWqtscNvWAI7U1CtlaD1KilQ6iudt1aI=
-golang.org/x/net v0.0.0-20190328230028-74de082e2cca/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190415214537-1da14a5a36f2 h1:iC0Y6EDq+rhnAePxGvJs2kzUAYcwESqdcGRPzEUfzTU=
-golang.org/x/net v0.0.0-20190415214537-1da14a5a36f2/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190420063019-afa5a82059c6 h1:HdqqaWmYAUI7/dmByKKEw+yxDksGSo+9GjkUc9Zp34E=
-golang.org/x/net v0.0.0-20190420063019-afa5a82059c6/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190424024845-afe8014c977f h1:uALRiwYevCJtciRa4mKKFkrs5jY4F2OTf1D2sfi1swY=
-golang.org/x/net v0.0.0-20190424024845-afe8014c977f/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190424112056-4829fb13d2c6 h1:FP8hkuE6yUEaJnK7O2eTuejKWwW+Rhfj80dQ2JcKxCU=
-golang.org/x/net v0.0.0-20190424112056-4829fb13d2c6/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190321052220-f7bb7a8bee54/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190322080309-f49334f85ddc/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190329044733-9eb1bfa1ce65/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190415145633-3fd5a3612ccd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190416152802-12500544f89f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190419153524-e8e3143a4f4a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.1/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190424031103-cb2dda6eabdf/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
@@ -25,13 +25,8 @@ type Config struct {
 	Resend       int    `json:"resend"`
 	NoCongestion int    `json:"nc"`
 	SockBuf      int    `json:"sockbuf"`
-	SmuxBuf      int    `json:"smuxbuf"`
 	KeepAlive    int    `json:"keepalive"`
 	Log          string `json:"log"`
-	SnmpLog      string `json:"snmplog"`
-	SnmpPeriod   int    `json:"snmpperiod"`
-	Pprof        bool   `json:"pprof"`
-	Quiet        bool   `json:"quiet"`
 }

 func parseJSONConfig(config *Config, path string) error {
@@ -2,36 +2,27 @@ package main

 import (
 	"crypto/sha1"
-	"encoding/csv"
-	"fmt"
 	"io"
 	"log"
 	"math/rand"
 	"net"
-	"net/http"
-	_ "net/http/pprof"
 	"os"
-	"sync"
 	"time"

 	"golang.org/x/crypto/pbkdf2"

-	"path/filepath"
-
-	"github.com/golang/snappy"
+	"github.com/klauspost/compress/snappy"
 	"github.com/urfave/cli"
 	kcp "github.com/xtaci/kcp-go"
 	"github.com/xtaci/smux"
 )

-// SALT is use for pbkdf2 key expansion
-const SALT = "kcp-go"
-
-// VERSION is injected by buildflags
-var VERSION = "SELFBUILD"
-
-// A pool for stream copying
-var xmitBuf sync.Pool
+var (
+	// VERSION is injected by buildflags
+	VERSION = "SELFBUILD"
+	// SALT is use for pbkdf2 key expansion
+	SALT = "kcp-go"
+)

 type compStream struct {
 	conn net.Conn
@@ -65,9 +56,7 @@ func newCompStream(conn net.Conn) *compStream {
 func handleMux(conn io.ReadWriteCloser, config *Config) {
 	// stream multiplex
 	smuxConfig := smux.DefaultConfig()
-	smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-	smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
-
+	smuxConfig.MaxReceiveBuffer = config.SockBuf
 	mux, err := smux.Server(conn, smuxConfig)
 	if err != nil {
 		log.Println(err)
@@ -75,47 +64,44 @@ func handleMux(conn io.ReadWriteCloser, config *Config) {
 	}
 	defer mux.Close()
 	for {
-		stream, err := mux.AcceptStream()
+		p1, err := mux.AcceptStream()
 		if err != nil {
 			log.Println(err)
 			return
 		}
-
-		go func(p1 *smux.Stream) {
-			p2, err := net.Dial("tcp", config.Target)
-			if err != nil {
-				p1.Close()
-				log.Println(err)
-				return
-			}
-			handleClient(p1, p2, config.Quiet)
-		}(stream)
+		p2, err := net.DialTimeout("tcp", config.Target, 5*time.Second)
+		if err != nil {
+			p1.Close()
+			log.Println(err)
+			continue
+		}
+		if err := p2.(*net.TCPConn).SetReadBuffer(config.SockBuf); err != nil {
+			log.Println("TCP SetReadBuffer:", err)
+		}
+		if err := p2.(*net.TCPConn).SetWriteBuffer(config.SockBuf); err != nil {
+			log.Println("TCP SetWriteBuffer:", err)
+		}
+		go handleClient(p1, p2)
 	}
 }

-func handleClient(p1, p2 io.ReadWriteCloser, quiet bool) {
-	if !quiet {
-		log.Println("stream opened")
-		defer log.Println("stream closed")
-	}
+func handleClient(p1, p2 io.ReadWriteCloser) {
+	log.Println("stream opened")
+	defer log.Println("stream closed")
 	defer p1.Close()
 	defer p2.Close()

-	// start tunnel & wait for tunnel termination
-	streamCopy := func(dst io.Writer, src io.Reader) chan struct{} {
-		die := make(chan struct{})
-		go func() {
-			buf := xmitBuf.Get().([]byte)
-			io.CopyBuffer(dst, src, buf)
-			xmitBuf.Put(buf)
-			close(die)
-		}()
-		return die
-	}
+	// start tunnel
+	p1die := make(chan struct{})
+	go func() { io.Copy(p1, p2); close(p1die) }()

+	p2die := make(chan struct{})
+	go func() { io.Copy(p2, p1); close(p2die) }()
+
+	// wait for tunnel termination
 	select {
-	case <-streamCopy(p1, p2):
-	case <-streamCopy(p2, p1):
+	case <-p1die:
+	case <-p2die:
 	}
 }

@@ -132,10 +118,6 @@ func main() {
 		// add more log flags for debugging
 		log.SetFlags(log.LstdFlags | log.Lshortfile)
 	}
-	xmitBuf.New = func() interface{} {
-		return make([]byte, 65535)
-	}
-
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"
 	myApp.Usage = "server(with SMUX)"
@@ -160,12 +142,12 @@ func main() {
 		cli.StringFlag{
 			Name:  "crypt",
 			Value: "aes",
-			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, sm4, none",
+			Usage: "aes, aes-128, aes-192, salsa20, blowfish, twofish, cast5, 3des, tea, xtea, xor, none",
 		},
 		cli.StringFlag{
 			Name:  "mode",
 			Value: "fast",
-			Usage: "profiles: fast3, fast2, fast, normal, manual",
+			Usage: "profiles: fast3, fast2, fast, normal",
 		},
 		cli.IntFlag{
 			Name:  "mtu",
@@ -183,12 +165,12 @@ func main() {
 			Usage: "set receive window size(num of packets)",
 		},
 		cli.IntFlag{
-			Name:  "datashard,ds",
+			Name:  "datashard",
 			Value: 10,
 			Usage: "set reed-solomon erasure coding - datashard",
 		},
 		cli.IntFlag{
-			Name:  "parityshard,ps",
+			Name:  "parityshard",
 			Value: 3,
 			Usage: "set reed-solomon erasure coding - parityshard",
 		},
@@ -213,7 +195,7 @@ func main() {
 		},
 		cli.IntFlag{
 			Name:   "interval",
-			Value:  50,
+			Value:  40,
 			Hidden: true,
 		},
 		cli.IntFlag{
@@ -227,43 +209,20 @@ func main() {
 			Hidden: true,
 		},
 		cli.IntFlag{
-			Name:  "sockbuf",
-			Value: 4194304, // socket buffer size in bytes
-			Usage: "per-socket buffer in bytes",
+			Name:   "sockbuf",
+			Value:  4194304, // socket buffer size in bytes
+			Hidden: true,
 		},
 		cli.IntFlag{
-			Name:  "smuxbuf",
-			Value: 4194304,
-			Usage: "the overall de-mux buffer in bytes",
-		},
-		cli.IntFlag{
-			Name:  "keepalive",
-			Value: 10, // nat keepalive interval in seconds
-			Usage: "seconds between heartbeats",
-		},
-		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.BoolFlag{
-			Name:  "pprof",
-			Usage: "start profiling server on :6060",
+			Name:   "keepalive",
+			Value:  10, // nat keepalive interval in seconds
+			Hidden: true,
 		},
 		cli.StringFlag{
 			Name:  "log",
 			Value: "",
 			Usage: "specify a log file to output, default goes to stderr",
 		},
-		cli.BoolFlag{
-			Name:  "quiet",
-			Usage: "to suppress the 'stream open/close' messages",
-		},
 		cli.StringFlag{
 			Name:  "c",
 			Value: "", // when the value is not empty, the config path must exists
@@ -290,13 +249,8 @@ func main() {
 		config.Resend = c.Int("resend")
 		config.NoCongestion = c.Int("nc")
 		config.SockBuf = c.Int("sockbuf")
-		config.SmuxBuf = c.Int("smuxbuf")
 		config.KeepAlive = c.Int("keepalive")
 		config.Log = c.String("log")
-		config.SnmpLog = c.String("snmplog")
-		config.SnmpPeriod = c.Int("snmpperiod")
-		config.Pprof = c.Bool("pprof")
-		config.Quiet = c.Bool("quiet")

 		if c.String("c") != "" {
 			//Now only support json config file
@@ -314,9 +268,9 @@ func main() {

 		switch config.Mode {
 		case "normal":
-			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 40, 2, 1
-		case "fast":
 			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 30, 2, 1
+		case "fast":
+			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 0, 20, 2, 1
 		case "fast2":
 			config.NoDelay, config.Interval, config.Resend, config.NoCongestion = 1, 20, 2, 1
 		case "fast3":
@@ -324,12 +278,9 @@ func main() {
 		}

 		log.Println("version:", VERSION)
-		log.Println("initiating key derivation")
 		pass := pbkdf2.Key([]byte(config.Key), []byte(SALT), 4096, 32, sha1.New)
 		var block kcp.BlockCrypt
 		switch config.Crypt {
-		case "sm4":
-			block, _ = kcp.NewSM4BlockCrypt(pass[:16])
 		case "tea":
 			block, _ = kcp.NewTEABlockCrypt(pass[:16])
 		case "xor":
@@ -370,12 +321,7 @@ func main() {
 		log.Println("acknodelay:", config.AckNodelay)
 		log.Println("dscp:", config.DSCP)
 		log.Println("sockbuf:", config.SockBuf)
-		log.Println("smuxbuf:", config.SmuxBuf)
 		log.Println("keepalive:", config.KeepAlive)
-		log.Println("snmplog:", config.SnmpLog)
-		log.Println("snmpperiod:", config.SnmpPeriod)
-		log.Println("pprof:", config.Pprof)
-		log.Println("quiet:", config.Quiet)

 		if err := lis.SetDSCP(config.DSCP); err != nil {
 			log.Println("SetDSCP:", err)
@@ -386,21 +332,15 @@ func main() {
 		if err := lis.SetWriteBuffer(config.SockBuf); err != nil {
 			log.Println("SetWriteBuffer:", err)
 		}
-
-		go snmpLogger(config.SnmpLog, config.SnmpPeriod)
-		if config.Pprof {
-			go http.ListenAndServe(":6060", nil)
-		}
-
 		for {
 			if conn, err := lis.AcceptKCP(); err == nil {
 				log.Println("remote address:", conn.RemoteAddr())
 				conn.SetStreamMode(true)
-				conn.SetWriteDelay(false)
 				conn.SetNoDelay(config.NoDelay, config.Interval, config.Resend, config.NoCongestion)
 				conn.SetMtu(config.MTU)
 				conn.SetWindowSize(config.SndWnd, config.RcvWnd)
 				conn.SetACKNoDelay(config.AckNodelay)
+				conn.SetKeepAlive(config.KeepAlive)

 				if config.NoComp {
 					go handleMux(conn, &config)
@@ -414,37 +354,3 @@ 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:
-			// split path into dirname and filename
-			logdir, logfile := filepath.Split(path)
-			// only format logfile
-			f, err := os.OpenFile(logdir+time.Now().Format(logfile), 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()
-		}
-	}
-}
@@ -18,7 +18,6 @@ func init() {
 func sigHandler() {
 	ch := make(chan os.Signal, 1)
 	signal.Notify(ch, syscall.SIGUSR1)
-	signal.Ignore(syscall.SIGPIPE)

 	for {
 		switch <-ch {
Author	SHA1	Message	Date
xtaci	229a4a8783	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-11-10 20:36:39 +08:00
xtaci	052f0a5397	optimized xor doesn't need -B flag for bce	2016-11-10 20:35:33 +08:00
xtaciandGitHub	8e74cf410c	Update README.en.md	2016-11-04 10:56:03 +08:00
xtaciandGitHub	206df4b69f	Update README.md	2016-11-04 10:55:36 +08:00
xtaciandGitHub	4ccc922059	Update README.md	2016-11-01 13:47:57 +08:00
xtaciandGitHub	1e88951c54	Update README.md	2016-11-01 13:41:49 +08:00
xtaciandGitHub	6540e3e90a	Update README.en.md	2016-11-01 13:38:47 +08:00
xtaciandGitHub	9ac03a973b	Update README.md	2016-11-01 13:34:51 +08:00
xtaciandGitHub	f911127426	Add files via upload	2016-11-01 13:31:48 +08:00
xtaciandGitHub	c601a18b3c	Update README.md	2016-10-29 21:42:49 +08:00
xtaciandGitHub	7eb8d3ce41	Update README.md	2016-10-28 17:56:18 +08:00
xtaciandGitHub	d425d472eb	Update README.md	2016-10-28 16:44:04 +08:00
xtaciandGitHub	bb9574e700	Update README.md	2016-10-28 13:02:58 +08:00
xtaciandGitHub	4670fa3a92	Update README.md	2016-10-28 12:55:03 +08:00
xtaciandGitHub	b84a293eda	simplify	2016-10-28 11:34:01 +08:00
xtaciandGitHub	7e1acb4a0f	Update README.md	2016-10-28 11:32:58 +08:00
xtaciandGitHub	829694fb75	Update README.md	2016-10-26 21:05:48 +08:00
xtaciandGitHub	c0c7d56f47	Update README.md	2016-10-26 14:51:04 +08:00
xtaciandGitHub	79d69e76bc	Update README.md	2016-10-26 14:43:49 +08:00
xtaciandGitHub	2378dc7dfe	Update README.md	2016-10-26 14:43:02 +08:00
xtaciandGitHub	4e4882741a	Update README.md	2016-10-26 14:32:08 +08:00
xtaciandGitHub	af39e7edf0	Update README.md	2016-10-26 14:28:58 +08:00
xtaciandGitHub	e12977a031	Update README.md	2016-10-26 14:27:33 +08:00
xtaciandGitHub	5ba941f654	Update README.md	2016-10-26 11:08:25 +08:00
xtaciandGitHub	5dbc2d25c8	Update README.md	2016-10-26 11:06:09 +08:00
xtaciandGitHub	0bcf57c444	Update README.md	2016-10-26 11:00:41 +08:00
xtaciandGitHub	a8b5c0677e	Update README.en.md	2016-10-26 10:59:49 +08:00
xtaciandGitHub	27b67c1a5a	Update README.md	2016-10-26 10:58:38 +08:00
xtaciandGitHub	45a802a137	Update README.en.md	2016-10-25 22:19:52 +08:00
xtaciandGitHub	c8cc2fe95e	Update README.md	2016-10-25 21:56:20 +08:00
xtaciandGitHub	2addfa670d	Update README.md	2016-10-25 17:59:16 +08:00
xtaciandGitHub	4001e1b23d	Update README.md	2016-10-24 22:59:48 +08:00
xtaciandGitHub	40590417a9	Update README.md	2016-10-24 17:28:45 +08:00
xtaciandGitHub	67db1f276b	Update README.md	2016-10-24 13:15:54 +08:00
xtaciandGitHub	16b4b6a9a0	Update README.md	2016-10-24 13:15:07 +08:00
xtaciandGitHub	c4d07f13f1	Update README.md	2016-10-22 23:02:55 +08:00
xtaciandGitHub	5945a2490c	Update README.md	2016-10-22 11:00:33 +08:00
xtaciandGitHub	532b2c89d5	Update README.md	2016-10-19 13:41:01 +08:00
xtaciandGitHub	b2b4f8cdf6	Update README.md	2016-10-19 11:38:56 +08:00
xtaciandGitHub	f7655b79e0	Update README.md	2016-10-19 11:35:27 +08:00
xtaciandGitHub	91980543ee	Update README.md	2016-10-19 11:29:56 +08:00
xtaciandGitHub	02cda02f9a	Update README.md	2016-10-19 11:28:55 +08:00
xtaciandGitHub	6016302e8a	Update README.md	2016-10-19 10:29:00 +08:00
xtaciandGitHub	dfdd4c8c24	Update README.md	2016-10-18 23:16:48 +08:00
xtaciandGitHub	2195981b01	Update README.md	2016-10-18 11:25:15 +08:00
xtaciandGitHub	485572857e	Update README.md	2016-10-18 10:27:16 +08:00
xtaci	4b2d0e567d	replace "github.com/golang/snappy" with "github.com/klauspost/compress/snappy"	2016-10-18 10:14:23 +08:00
xtaciandGitHub	68b36fbf74	Update README.md	2016-10-01 09:49:36 +08:00
xtaci	9b08423b3e	upd README	2016-09-27 12:36:23 +08:00
xtaci	35522d30cb	upd README	2016-09-23 12:42:14 +08:00
xtaci	e8e3e5a894	add -log option to redirect log , see issue #199	2016-09-22 15:20:42 +08:00
xtaci	9c95df026b	lint	2016-09-20 16:16:36 +08:00
xtaci	09aea3056a	block-waiting for a connection after the client has been started	2016-09-19 10:40:59 +08:00
xtaci	0788aa8260	Revert "Revert "do not panic when network is temporarily unavailable"" This reverts commit `2f479b788c`.	2016-09-19 10:31:21 +08:00
xtaci	2f479b788c	Revert "do not panic when network is temporarily unavailable" This reverts commit `f3f78460a4`.	2016-09-18 21:00:28 +08:00
xtaci	f3f78460a4	do not panic when network is temporarily unavailable	2016-09-18 20:51:35 +08:00
xtaci	3127b2d19f	lint	2016-09-06 16:29:36 +08:00
xtaci	3db63cdff6	add a max ttl for session in scavenger	2016-09-03 14:32:35 +08:00
xtaci	5154cf81de	api change of smux	2016-09-02 23:18:29 +08:00
xtaci	cc80029b1e	adjust params	2016-09-02 17:29:55 +08:00
xtaci	23d6624745	upd	2016-09-02 17:05:44 +08:00
xtaci	f38f7a8ac5	scavenge only	2016-09-02 10:55:22 +08:00
xtaci	e913f96f7e	Merge branch 'smux'	2016-09-02 10:54:00 +08:00
xtaci	5d0d8bd74d	upd	2016-09-02 10:42:23 +08:00
xtaci	4010c83e8f	upd	2016-09-01 15:02:21 +08:00
xtaci	76351dff2b	upd	2016-09-01 12:59:08 +08:00
xtaci	7a5807cbf5	Revert "explict close session" This reverts commit `cb0f299263`.	2016-08-31 23:24:30 +08:00
xtaci	6b26c75ea5	upd	2016-08-31 21:48:43 +08:00
xtaci	0873f349c3	upd	2016-08-31 21:46:14 +08:00
xtaci	281f8675a3	upd	2016-08-31 21:33:52 +08:00
xtaci	65512e9296	upd	2016-08-31 21:31:05 +08:00
xtaci	3ea858ed90	upd	2016-08-31 21:29:27 +08:00
xtaci	5f23781fc0	scavenger	2016-08-31 21:27:19 +08:00
xtaci	2b3573f4ea	Merge branch 'master' into smux	2016-08-31 18:10:48 +08:00
xtaci	cb0f299263	explict close session	2016-08-31 18:07:24 +08:00
xtaci	f64bc908ee	upd	2016-08-31 16:30:51 +08:00
xtaci	43c6a674ef	upd	2016-08-31 15:28:43 +08:00
xtaci	1a48680a55	upd	2016-08-31 15:23:31 +08:00
xtaci	dbdb5293b4	branch smux	2016-08-31 11:39:56 +08:00
xtaci	94070bfcbe	should continue	2016-08-30 15:34:19 +08:00
xtaciandGitHub	398a0bf9fc	Merge pull request #166 from jannson/master add support for json configuration	2016-08-30 14:56:33 +08:00
janson	ff54a2dc92	better for parseJsonConfig	2016-08-30 14:44:55 +08:00
janson	747eba0ee1	add usage and check error for json config	2016-08-30 14:24:08 +08:00
janson	f057cbc7f4	add support for json configuration (server side)	2016-08-30 13:50:37 +08:00
janson	a83ae4bf15	add support for json configuration	2016-08-30 13:39:08 +08:00
xtaci	4d062090a7	bugfix	2016-08-30 11:17:15 +08:00
xtaci	27f76582e1	structured configuration	2016-08-29 16:06:38 +08:00
xtaci	b023b542e8	handle errors gracefully	2016-08-28 10:37:09 +08:00
xtaci	9a3be067bf	upd	2016-08-27 21:52:42 +08:00
xtaci	8705bd7670	upd	2016-08-27 09:17:16 +08:00
xtaci	b4e5181a2f	optimize retry strategy	2016-08-27 09:00:35 +08:00
xtaci	94f61b5945	upd param	2016-08-26 13:04:38 +08:00
xtaci	efc0b99d21	Revert "replace yamux with muxado" This reverts commit `3803993529`.	2016-08-26 11:35:13 +08:00
xtaci	3803993529	replace yamux with muxado	2016-08-26 10:58:43 +08:00
xtaci	d23ff7c351	upd	2016-08-25 20:34:33 +08:00
xtaci	f383ee31a5	add autoexpire option	2016-08-25 20:33:04 +08:00
xtaci	d399f220f0	remove a line	2016-08-25 20:04:34 +08:00
xtaci	59a1bbc7b8	SetFinalizer to session	2016-08-25 18:22:20 +08:00
xtaci	3b656e101f	better api	2016-08-25 11:46:17 +08:00
xtaci	aec364eb72	set tcp socket buffer	2016-08-24 12:27:33 +08:00
xtaci	e26ab6729f	spelling	2016-08-22 14:46:57 +08:00
xtaci	583fe3ba24	simple layer	2016-08-21 19:09:08 +08:00
xtaci	7fd6442284	refer to my fork	2016-08-20 21:15:05 +08:00
xtaci	81f4643830	Revert "refer to fork" This reverts commit `744a6407e7`.	2016-08-20 20:49:44 +08:00
xtaci	744a6407e7	refer to fork	2016-08-20 20:23:04 +08:00
xtaci	2cf5292ac1	revert yamux config	2016-08-20 18:37:52 +08:00
xtaci	b3a8b631b4	upd README	2016-08-20 16:48:10 +08:00
xtaci	1167419210	add salsa20, xtea crypto	2016-08-20 15:02:25 +08:00
xtaci	56f9f0d01a	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-08-20 13:39:01 +08:00
xtaci	96888f1cac	pisces	2016-08-20 13:35:27 +08:00
xtaciandGitHub	e752d70c79	Update README.en.md	2016-08-20 10:47:59 +08:00
xtaciandGitHub	a882b94e5b	Update README.md	2016-08-20 10:46:34 +08:00
xtaciandGitHub	790a6d5352	Update README.en.md	2016-08-19 21:21:03 +08:00
xtaciandGitHub	603c2db5ab	Update README.md	2016-08-19 21:20:15 +08:00
xtaci	581df3a34d	update README.md	2016-08-19 15:00:25 +08:00
xtaci	6113d2b497	update README.md	2016-08-19 14:27:13 +08:00
xtaci	d3b8a4d71d	keep compatiability	2016-08-19 13:17:02 +08:00
xtaci	1f0a4a2c2f	change default settings	2016-08-19 12:31:51 +08:00
xtaci	75923fb08f	adjust -help	2016-08-19 12:22:36 +08:00
xtaci	0243422885	add supports for blowfish, cast5, 3des	2016-08-19 11:15:13 +08:00
xtaci	6374cb0d36	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-08-18 23:44:25 +08:00
xtaci	0aedc21c50	Revert "change default resend from 2 -> 3" This reverts commit `003617186b`.	2016-08-18 23:40:51 +08:00
xtaciandGitHub	727887517f	Update README.en.md	2016-08-18 10:56:46 +08:00
xtaciandGitHub	7b81b24e8d	Update README.md	2016-08-18 10:55:55 +08:00
xtaci	ba22434379	experimental Bounds Checking Elimination	2016-08-18 09:51:17 +08:00
xtaci	003617186b	change default resend from 2 -> 3	2016-08-17 21:07:27 +08:00
xtaciandGitHub	b9ce27cb3e	Update README.en.md	2016-08-17 11:33:53 +08:00
xtaciandGitHub	c93a199823	Update README.md	2016-08-17 11:32:58 +08:00
xtaci	bb34894947	upd issue	2016-08-17 11:26:35 +08:00
xtaci	f743a075c5	upd	2016-08-17 11:22:09 +08:00
xtaci	a04c959c9c	add aes-128 aes-192 cipher	2016-08-16 16:46:27 +08:00
xtaci	4a79d26d35	upd README.md	2016-08-16 10:31:37 +08:00
xtaci	8104d18959	Revert "add manual GC support" This reverts commit `ae699f498c`.	2016-08-15 21:34:43 +08:00
xtaci	ae699f498c	add manual GC support	2016-08-15 20:28:15 +08:00
xtaci	dbdd79f1d6	upd	2016-08-15 14:04:45 +08:00
xtaciandGitHub	51bdedb1b3	Update README.md	2016-08-15 14:03:48 +08:00
xtaci	8ea071fa03	upd README	2016-08-15 10:23:47 +08:00
xtaciandGitHub	f74201a410	Update ISSUE_TEMPLATE	2016-08-14 18:34:32 +08:00
xtaci	96622bcfc0	add issue template	2016-08-12 10:27:17 +08:00
xtaciandGitHub	29328b375a	Update README.md	2016-08-11 21:02:21 +08:00
xtaciandGitHub	db7f1def1b	Update README.en.md	2016-08-11 20:50:48 +08:00
xtaciandGitHub	628e723167	Update README.md	2016-08-11 20:48:48 +08:00
xtaci	ff393ccacb	revert part of the PR	2016-08-11 14:47:43 +08:00
xtaciandGitHub	1bb61dbcfc	Merge pull request #113 from buaazp/yamux-optimize *: some optimizes for yamux cache and config	2016-08-11 14:38:05 +08:00
招牌疯子	0b1598d09f	*: yamux optimizes for cache and config and debug log flags when selfbuild.	2016-08-11 14:23:44 +08:00
xtaci	0552bebe46	upd	2016-08-11 13:29:01 +08:00
xtaci	d158e6df3f	set stream max windows size to sockbuff	2016-08-11 13:20:03 +08:00
xtaciandGitHub	cf7bca5cb7	Update README.md	2016-08-11 10:05:05 +08:00
xtaciandGitHub	99a2b60c7d	Update README.md	2016-08-11 10:04:25 +08:00
xtaciandGitHub	4a5024b361	Update README.md	2016-08-11 10:04:02 +08:00
xtaciandGitHub	12bd3853d5	Update README.en.md	2016-08-10 10:31:05 +08:00
xtaciandGitHub	7992b87889	Update README.md	2016-08-10 10:30:17 +08:00
xtaciandGitHub	cfcc2e0676	Update README.en.md	2016-08-09 15:52:45 +08:00
xtaciandGitHub	1e870f02af	Update README.md	2016-08-09 14:08:22 +08:00
xtaci	bf2abf14e7	change default socket buffer to 4MB(macOS default limit)	2016-08-08 10:50:46 +08:00
xtaci	2df3e6c438	optimize API	2016-08-08 10:41:42 +08:00
xtaciandGitHub	ba4c93c3f5	Update README.md	2016-08-07 21:00:52 +08:00
xtaciandGitHub	bc22f46065	Merge pull request #97 from buaazp/master optmize cli flags for accept callback	2016-08-07 19:45:01 +08:00
招牌疯子	3fc15de95d	optmize cli flags for accept callback And use custom kcp package name for godef.	2016-08-07 14:09:58 +08:00
xtaci	6f9449bb10	rename api	2016-08-06 11:21:20 +08:00
xtaci	c6cbfd307e	change ping -> keepalive for nat keep-alive	2016-08-06 10:19:13 +08:00
xtaci	d68792cb1a	add hidden parameters -- ping	2016-08-05 22:46:11 +08:00
xtaci	117edce137	upd kcp-go api	2016-08-05 17:06:57 +08:00
xtaciandGitHub	990a5f7f87	Update README.md	2016-08-02 14:24:42 +08:00
xtaciandGitHub	19d7d74d59	Add files via upload	2016-08-01 12:44:41 +08:00
xtaci	31afe325ad	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-07-29 10:17:33 +08:00
xtaci	ab7519c2d6	remove one unnecessary line	2016-07-29 10:17:14 +08:00
xtaciandGitHub	d6da2e1ead	Update README.en.md	2016-07-27 13:51:13 +08:00
xtaciandGitHub	4d5a3dd791	Update README.md	2016-07-27 13:49:01 +08:00
xtaciandGitHub	4a46d696b6	Update README.md	2016-07-27 13:41:31 +08:00
xtaciandGitHub	33d50dcd45	Update README.en.md	2016-07-26 23:26:23 +08:00
xtaciandGitHub	2b3f6dbabe	Update README.md	2016-07-26 23:25:15 +08:00
xtaciandGitHub	448717fa1c	Update README.md	2016-07-26 21:40:17 +08:00
xtaciandGitHub	887fba3381	Update README.md	2016-07-26 21:33:52 +08:00
xtaciandGitHub	fb62d45df8	Update README.en.md	2016-07-26 16:10:29 +08:00
xtaciandGitHub	cd1e2b4ff7	Update README.md	2016-07-26 16:09:08 +08:00
xtaci	5ee659dd41	improve network latency by introducing stream mode	2016-07-25 20:14:12 +08:00
xtaciandGitHub	1a596f55f4	Update README.en.md	2016-07-24 16:18:28 +08:00
xtaciandGitHub	889a904dca	Update README.md	2016-07-24 16:18:09 +08:00
xtaciandGitHub	172dcf6481	Update README.en.md	2016-07-24 16:16:34 +08:00
xtaciandGitHub	ff92c70b40	Add files via upload	2016-07-24 16:15:22 +08:00
xtaciandGitHub	af1d28ae5a	Update README.md	2016-07-24 16:09:06 +08:00
xtaciandGitHub	4a7d143c69	Update README.en.md	2016-07-24 16:04:58 +08:00
xtaciandGitHub	7ff69f16d5	Update README.md	2016-07-24 16:03:48 +08:00
xtaciandGitHub	7eb037c4dd	Update README.md	2016-07-24 16:00:53 +08:00
xtaciandGitHub	a87f6af812	Add files via upload	2016-07-24 15:58:35 +08:00
xtaciandGitHub	7574f9bfd3	Update README.md	2016-07-24 09:23:47 +08:00
xtaci	d5b5cf683b	update Dockerfile	2016-07-23 11:30:37 +08:00
xtaci	fded353b68	update Dockerfile	2016-07-23 11:23:18 +08:00
xtaci	832dbed064	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-07-23 11:18:48 +08:00
xtaci	4b660fa02c	update	2016-07-23 11:18:29 +08:00
xtaciandGitHub	59e6ebee05	Update README.md	2016-07-23 11:10:55 +08:00
xtaciandGitHub	c1a895426d	Update README.md	2016-07-23 10:49:21 +08:00
xtaci	ebdcc9ae8a	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-07-22 21:41:24 +08:00
xtaci	2c076f7a34	update Dockerfile to alpine	2016-07-22 21:25:29 +08:00
Daniel FuandGitHub	a1a0fbd060	Update README.md	2016-07-21 20:25:43 +08:00
Daniel FuandGitHub	bc4214e4a8	Update README.md	2016-07-21 12:27:00 +08:00
Daniel FuandGitHub	61e6dfe87b	Update README.md	2016-07-21 12:26:00 +08:00
Daniel FuandGitHub	4448a2658d	Add files via upload	2016-07-20 14:53:01 +08:00
Daniel FuandGitHub	c9a312f12b	Update README.md	2016-07-18 11:04:47 +08:00
Daniel FuandGitHub	2bb48495d3	Update README.md	2016-07-18 11:03:30 +08:00
Daniel FuandGitHub	06f0a6f80b	Update README.md	2016-07-18 11:01:21 +08:00
Daniel FuandGitHub	ea895ad824	Update README.md	2016-07-18 10:52:37 +08:00
Daniel FuandGitHub	a72bf0c9b5	Update README.md	2016-07-18 10:32:22 +08:00
xtaci	2b83dbda07	hide acknodelay parameters	2016-07-16 22:57:03 +08:00
xtaci	c35ef339af	fix urfave deprecated action signature	2016-07-14 10:01:35 +08:00
xtaci	c96d4b534e	Merge branch 'master' of https://github.com/xtaci/kcptun	2016-07-12 12:35:54 +08:00
xtaci	6216049c14	force CGO_ENABLED=0	2016-07-12 12:35:23 +08:00
Daniel FuandGitHub	0d98020e59	Update README.md	2016-07-12 11:32:42 +08:00
Daniel FuandGitHub	14ea6f8a71	Update README.md	2016-07-11 17:23:00 +08:00
Daniel FuandGitHub	214669eaf9	Update README.md	2016-07-11 17:15:15 +08:00
Daniel FuandGitHub	48d2cad6ac	Update README.en.md	2016-07-11 17:14:04 +08:00
Daniel FuandGitHub	67cd5a4e22	Update README.md	2016-07-11 17:06:34 +08:00
Daniel FuandGitHub	f49392c95e	Update README.md	2016-07-11 17:03:18 +08:00
Daniel FuandGitHub	4c9370a252	Update README.en.md	2016-07-07 11:07:42 +08:00
Daniel FuandGitHub	ef3cf3d982	Update README.en.md	2016-07-07 11:03:49 +08:00
Daniel FuandGitHub	8e5f405336	Update README.md	2016-07-07 10:52:50 +08:00
Daniel FuandGitHub	2aa6887860	Update README.md	2016-07-07 10:37:27 +08:00
Daniel FuandGitHub	9d13ec9350	Update README.md	2016-07-06 21:31:55 +08:00
Daniel FuandGitHub	ef9d08567f	Update README.md	2016-07-06 21:26:30 +08:00
Daniel FuandGitHub	66ebcf2773	Update README.md	2016-07-06 21:18:52 +08:00
Daniel FuandGitHub	67a08b43ed	Update README.md	2016-07-06 21:15:36 +08:00
Daniel FuandGitHub	46ce8a2e51	Update README.md	2016-07-06 21:12:34 +08:00
Daniel FuandGitHub	fd6a6e4a64	Update README.md	2016-07-06 19:18:55 +08:00
Daniel FuandGitHub	1de3c1fa8a	Update README.md	2016-07-05 22:31:08 +08:00
Daniel FuandGitHub	cc821b6eaf	Update README.en.md	2016-07-05 22:30:25 +08:00
xtaci	6f8ce90c23	add english readme	2016-07-05 22:25:36 +08:00
Daniel FuandGitHub	32be3e836b	Update README.md	2016-07-05 21:46:37 +08:00
Daniel FuandGitHub	664a79e488	Update README.md	2016-07-05 14:12:33 +08:00
Daniel FuandGitHub	74d874b0db	Update README.md	2016-07-04 11:37:58 +08:00
Daniel FuandGitHub	58874784f3	Add files via upload	2016-07-04 11:36:24 +08:00
Daniel FuandGitHub	f92bae1d03	Update README.md	2016-07-04 11:35:35 +08:00
Daniel FuandGitHub	a1aa89ea1c	Update README.md	2016-07-02 17:04:35 +08:00
Daniel FuandGitHub	52c75f68ba	Update README.md	2016-07-02 11:11:35 +08:00
Daniel FuandGitHub	57fce73ca6	Update README.md	2016-07-02 09:52:18 +08:00
xtaci	13e980cdff	lint	2016-06-30 14:45:26 +08:00