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# shadowsocks-libev
## Intro
[Shadowsocks-libev](https://shadowsocks.org) is a lightweight secured SOCKS5
proxy for embedded devices and low-end boxes.
It is a port of [Shadowsocks](https://github.com/shadowsocks/shadowsocks)
created by [@clowwindy](https://github.com/clowwindy), and maintained by
[@madeye](https://github.com/madeye) and [@linusyang](https://github.com/linusyang).
Current version: 3.0.6 | [Changelog](debian/changelog)
Travis CI: [![Travis CI](https://travis-ci.org/shadowsocks/shadowsocks-libev.svg?branch=master)](https://travis-ci.org/shadowsocks/shadowsocks-libev)
## Features
Shadowsocks-libev is written in pure C and depends on [libev](http://software.schmorp.de/pkg/libev.html). It's designed
to be a very simple implementation of shadowsocks protocol, in order to keep the resource usage as low as possible.
For a full list of feature comparison between different versions of shadowsocks,
refer to the [Wiki page](https://github.com/shadowsocks/shadowsocks/wiki/Feature-Comparison-across-Different-Versions).
## Prerequisites
### Get the latest source code
To get the latest source code, you should also update the submodules as following:
```bash
git clone https://github.com/shadowsocks/shadowsocks-libev.git
cd shadowsocks-libev
git submodule update --init --recursive
```
### Build and install with recent libsodium
You have to install libsodium 1.0.8 or later before building. See [Directly build and install on UNIX-like system](#linux).
## Installation
### Distribution-specific guide
- [Debian & Ubuntu](#debian--ubuntu)
+ [Install from repository](#install-from-repository)
+ [Build deb package from source](#build-deb-package-from-source)
+ [Configure and start the service](#configure-and-start-the-service)
- [Fedora & RHEL](#fedora--rhel)
+ [Build from source with centos](#build-from-source-with-centos)
+ [Install from repository](#install-from-repository-1)
- [Archlinux](#archlinux)
- [NixOS](#nixos)
- [Nix](#nix)
- [Directly build and install on UNIX-like system](#linux)
- [FreeBSD](#freebsd)
- [OpenWRT](#openwrt)
- [OS X](#os-x)
- [Windows](#windows)
* * *
### Pre-build configure guide
For a complete list of avaliable configure-time option,
try `configure --help`.
### Debian & Ubuntu
#### Install from repository
**Note: The repositories doesn't always contain the latest version. Please build from source if you want the latest version. (see below)**
Shadowsocks-libev is available in the official repository for following distributions:
* Debian 9 or higher (including testing and unstable/sid)
* Ubuntu 16.10 or higher
```bash
sudo apt update
sudo apt install shadowsocks-libev
```
For **Debian 8 (Jessie)** users, please install it from `jessie-backports`:
We strongly encourage you to install shadowsocks-libev from `jessie-backports`.
Please follow instructions on [Debian Backports](https://backports.debian.org).
```bash
sudo sh -c 'printf "deb http://httpredir.debian.org/debian jessie-backports main" > /etc/apt/sources.list.d/jessie-backports.list'
sudo apt update
sudo apt -t jessie-backports install shadowsocks-libev
```
For **Ubuntu 14.04 and 16.04** users, please install from PPA:
```bash
sudo add-apt-repository ppa:max-c-lv/shadowsocks-libev
sudo apt-get update
sudo apt install shadowsocks-libev
```
#### Build deb package from source
Supported distributions:
* Debian 8, 9 or higher
* Ubuntu 14.04 LTS, 16.04 LTS, 16.10 or higher
For older systems, building `.deb` packages is not supported. Please directly install it from source.
You can build shadowsocks-libev and all its dependencies by script:
```bash
mkdir -p ~/build-area/
cp ./scripts/build_deb.sh ~/build-area/
cd ~/build-area
./build_deb.sh
```
Otherwise, try to build and install directly from source. See the [Linux](#linux) section below.
**Note for Debian 8 (Jessie) users**:
We strongly encourage you to install shadowsocks-libev from `jessie-backports`. If you insist on building from source, you will need to manually install libsodium from `jessie-backports`, **NOT** libsodium in main repository.
Please follow the instructions on [Debian Backports Website](https://backports.debian.org).
``` bash
cd shadowsocks-libev
sudo apt-get install --no-install-recommends devscripts equivs
mk-build-deps --root-cmd sudo --install --tool "apt-get -o Debug::pkgProblemResolver=yes --no-install-recommends -y"
./autogen.sh && dpkg-buildpackage -b -us -uc
cd ..
sudo dpkg -i shadowsocks-libev*.deb
```
#### Configure and start the service
```
# Edit the configuration file
sudo vim /etc/shadowsocks-libev/config.json
# Edit the default configuration for debian
sudo vim /etc/default/shadowsocks-libev
# Start the service
sudo /etc/init.d/shadowsocks-libev start # for sysvinit, or
sudo systemctl start shadowsocks-libev # for systemd
```
### Fedora & RHEL
Supported distributions:
* Fedora 22, 23, 24
* RHEL 6, 7 and derivatives (including CentOS, Scientific Linux)
#### Build from source with centos
If you are using CentOS 7, you need to install these prequirement to build from source code:
```bash
yum install epel-release -y
yum install gcc gettext autoconf libtool automake make pcre-devel asciidoc xmlto udns-devel libev-devel -y
```
#### Install from repository
Enable repo via `dnf`:
```
su -c 'dnf copr enable librehat/shadowsocks'
```
Or download yum repo on [Fedora Copr](https://copr.fedoraproject.org/coprs/librehat/shadowsocks/) and put it inside `/etc/yum.repos.d/`. The release `Epel` is for RHEL and its derivatives.
Then, install `shadowsocks-libev` via `dnf`:
```bash
su -c 'dnf update'
su -c 'dnf install shadowsocks-libev'
```
or `yum`:
```bash
su -c 'yum update'
su -c 'yum install shadowsocks-libev'
```
### Archlinux
```bash
sudo pacman -S shadowsocks-libev
```
Please refer to downstream [PKGBUILD](https://projects.archlinux.org/svntogit/community.git/tree/trunk?h=packages/shadowsocks-libev)
script for extra modifications and distribution-specific bugs.
### NixOS
```bash
nix-env -iA nixos.shadowsocks-libev
```
### Nix
```bash
nix-env -iA nixpkgs.shadowsocks-libev
```
### Linux
In general, you need the following build dependencies:
* autotools (autoconf, automake, libtool)
* gettext
* pkg-config
* libmbedtls
* libsodium
* libpcre3 (old pcre library)
* libev
* libudns
* asciidoc (for documentation only)
* xmlto (for documentation only)
If your system is too old to provide libmbedtls and libsodium (later than **v1.0.8**), you will need to either install those libraries manually or upgrade your system.
If your system provides with those libraries, you **should not** install them from source. You should jump this section and install them from distribution repository instead.
For some of the distributions, you might install build dependencies like this:
```bash
# Installation of basic build dependencies
## Debian / Ubuntu
sudo apt-get install --no-install-recommends gettext build-essential autoconf libtool libpcre3-dev asciidoc xmlto libev-dev libudns-dev automake libmbedtls-dev libsodium-dev
## CentOS / Fedora / RHEL
sudo yum install gettext gcc autoconf libtool automake make asciidoc xmlto udns-devel libev-devel
## Arch
sudo pacman -S gettext gcc autoconf libtool automake make asciidoc xmlto udns libev
# Installation of Libsodium
export LIBSODIUM_VER=1.0.12
wget https://download.libsodium.org/libsodium/releases/libsodium-$LIBSODIUM_VER.tar.gz
tar xvf libsodium-$LIBSODIUM_VER.tar.gz
pushd libsodium-$LIBSODIUM_VER
./configure --prefix=/usr && make
sudo make install
popd
sudo ldconfig
# Installation of MbedTLS
export MBEDTLS_VER=2.4.2
wget https://tls.mbed.org/download/mbedtls-$MBEDTLS_VER-gpl.tgz
tar xvf mbedtls-$MBEDTLS_VER-gpl.tgz
pushd mbedtls-$MBEDTLS_VER
make SHARED=1 CFLAGS=-fPIC
sudo make DESTDIR=/usr install
popd
sudo ldconfig
# Start building
./autogen.sh && ./configure && make
sudo make install
```
You may need to manually install missing softwares.
### FreeBSD
```bash
su
cd /usr/ports/net/shadowsocks-libev
make install
```
Edit your config.json file. By default, it's located in /usr/local/etc/shadowsocks-libev.
To enable shadowsocks-libev, add the following rc variable to your /etc/rc.conf file:
```
shadowsocks_libev_enable="YES"
```
Start the Shadowsocks server:
```bash
service shadowsocks_libev start
```
### OpenWRT
The OpenWRT project is maintained here:
[openwrt-shadowsocks](https://github.com/shadowsocks/openwrt-shadowsocks).
### OS X
For OS X, use [Homebrew](http://brew.sh) to install or build.
Install Homebrew:
```bash
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
```
Install shadowsocks-libev:
```bash
brew install shadowsocks-libev
```
## Usage
For a detailed and complete list of all supported arguments,
you may refer to the man pages of the applications, respectively.
```
   ss-[local|redir|server|tunnel|manager]
-s <server_host> host name or ip address of your remote server
-p <server_port> port number of your remote server
-l <local_port> port number of your local server
-k <password> password of your remote server
-m <encrypt_method> Encrypt method: rc4-md5,
aes-128-gcm, aes-192-gcm, aes-256-gcm,
aes-128-cfb, aes-192-cfb, aes-256-cfb,
aes-128-ctr, aes-192-ctr, aes-256-ctr,
camellia-128-cfb, camellia-192-cfb,
camellia-256-cfb, bf-cfb,
chacha20-poly1305, chacha20-ietf-poly1305
salsa20, chacha20 and chacha20-ietf.
[-f <pid_file>] the file path to store pid
[-t <timeout>] socket timeout in seconds
[-c <config_file>] the path to config file
[-i <interface>] network interface to bind,
not available in redir mode
[-b <local_address>] local address to bind
[-u] enable udprelay mode,
TPROXY is required in redir mode
[-U] enable UDP relay and disable TCP relay,
not available in local mode
[-L <addr>:<port>] specify destination server address and port
for local port forwarding,
only available in tunnel mode
[-d <addr>] setup name servers for internal DNS resolver,
only available in server mode
[--fast-open] enable TCP fast open,
only available in local and server mode,
with Linux kernel > 3.7.0
[--acl <acl_file>] config file of ACL (Access Control List)
only available in local and server mode
[--manager-address <addr>] UNIX domain socket address
only available in server and manager mode
[--executable <path>] path to the executable of ss-server
only available in manager mode
[--plugin <name>] Enable SIP003 plugin. (Experimental)
[--plugin-opts <options>] Set SIP003 plugin options. (Experimental)
[-v] verbose mode
notes:
ss-redir provides a transparent proxy function and only works on the
Linux platform with iptables.
```
## Advanced usage
The latest shadowsocks-libev has provided a *redir* mode. You can configure your Linux-based box or router to proxy all TCP traffic transparently.
# Create new chain
root@Wrt:~# iptables -t nat -N SHADOWSOCKS
root@Wrt:~# iptables -t mangle -N SHADOWSOCKS
root@Wrt:~# iptables -t mangle -N SHADOWSOCKS_MARK
# Ignore your shadowsocks server's addresses
# It's very IMPORTANT, just be careful.
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 123.123.123.123 -j RETURN
# Ignore LANs and any other addresses you'd like to bypass the proxy
# See Wikipedia and RFC5735 for full list of reserved networks.
# See ashi009/bestroutetb for a highly optimized CHN route list.
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN
# Anything else should be redirected to shadowsocks's local port
root@Wrt:~# iptables -t nat -A SHADOWSOCKS -p tcp -j REDIRECT --to-ports 12345
# Add any UDP rules
root@Wrt:~# ip route add local default dev lo table 100
root@Wrt:~# ip rule add fwmark 1 lookup 100
root@Wrt:~# iptables -t mangle -A SHADOWSOCKS -p udp --dport 53 -j TPROXY --on-port 12345 --tproxy-mark 0x01/0x01
root@Wrt:~# iptables -t mangle -A SHADOWSOCKS_MARK -p udp --dport 53 -j MARK --set-mark 1
# Apply the rules
root@Wrt:~# iptables -t nat -A OUTPUT -p tcp -j SHADOWSOCKS
root@Wrt:~# iptables -t mangle -A PREROUTING -j SHADOWSOCKS
root@Wrt:~# iptables -t mangle -A OUTPUT -j SHADOWSOCKS_MARK
# Start the shadowsocks-redir
root@Wrt:~# ss-redir -u -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid
## Shadowsocks over KCP
It's quite easy to use shadowsocks and [KCP](https://github.com/skywind3000/kcp) together with [kcptun](https://github.com/xtaci/kcptun).
The goal of shadowsocks over KCP is to provide a fully configurable, UDP based protocol to improve poor connections, e.g. a high packet loss 3G network.
### Setup your server
```bash
server_linux_amd64 -l :21 -t 127.0.0.1:443 --crypt none --mtu 1200 --nocomp --mode normal --dscp 46 &
ss-server -s 0.0.0.0 -p 443 -k passwd -m chacha20 -u
```
### Setup your client
```bash
client_linux_amd64 -l 127.0.0.1:1090 -r <server_ip>:21 --crypt none --mtu 1200 --nocomp --mode normal --dscp 46 &
ss-local -s 127.0.0.1 -p 1090 -k passwd -m chacha20 -l 1080 -b 0.0.0.0 &
ss-local -s <server_ip> -p 443 -k passwd -m chacha20 -l 1080 -U -b 0.0.0.0
```
## Security Tips
Although shadowsocks-libev can handle thousands of concurrent connections nicely, we still recommend
setting up your server's firewall rules to limit connections from each user:
# Up to 32 connections are enough for normal usage
iptables -A INPUT -p tcp --syn --dport ${SHADOWSOCKS_PORT} -m connlimit --connlimit-above 32 -j REJECT --reject-with tcp-reset
## License
```
Copyright: 2013-2015, Clow Windy <clowwindy42@gmail.com>
2013-2017, Max Lv <max.c.lv@gmail.com>
2014, Linus Yang <linusyang@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
```
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