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shadowsocks-libev

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Bug-fix-only libev port of shadowsocks. Future development moved to shadowsocks-rust

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# shadowsocks-libev

[![Build Status](https://travis-ci.com/shadowsocks/shadowsocks-libev.svg?branch=master)](https://travis-ci.com/shadowsocks/shadowsocks-libev) [![Snap Status](https://snapcraft.io/shadowsocks-libev/badge.svg)](https://snapcraft.io/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: 3.3.6 | [Changelog](debian/changelog)

## 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 lightweight 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).

## Quick Start

Snap is the recommended way to install the latest binaries.

### Install snap core

https://snapcraft.io/core

### Install from snapcraft.io

Stable channel:

```bash
sudo snap install shadowsocks-libev
```

Edge channel:

```bash
sudo snap install shadowsocks-libev --edge
```

## Installation

### Distribution-specific guide

- [Debian & Ubuntu](#debian--ubuntu)
    + [Install from repository](#install-from-repository-not-recommended)
    + [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)
- [Archlinux & Manjaro](#archlinux--manjaro)
- [NixOS](#nixos)
- [Nix](#nix)
- [Directly build and install on UNIX-like system](#linux)
- [FreeBSD](#freebsd)
    + [Install](#install)
    + [Configuration](#configuration)
    + [Run](#run)
    + [Run as client](#run-as-client)
- [OpenWRT](#openwrt)
- [OS X](#os-x)
- [Windows (MinGW)](#windows-mingw)
- [Docker](#docker)

* * *

### Build from source (CMake)

shadowsocks-libev uses CMake as its sole build system. Start by pulling submodules:

```bash
git submodule update --init --recursive
```

Then build:

```bash
mkdir -p build && cd build
cmake ..
make
sudo make install
```

To run unit tests:

```bash
cd build
ctest --output-on-failure
```

#### CMake options

For a complete list of available options, run `cmake -LH` from a build directory.
Commonly used options:

| Option | Default | Description |
|---|---|---|
| `-DWITH_EMBEDDED_SRC=OFF` | `ON` | Use system libcork/libipset/libbloom instead of bundled submodules |
| `-DWITH_DOC_MAN=OFF` | `ON` | Skip man page generation (removes asciidoc/xmlto dependency) |
| `-DBUILD_TESTING=OFF` | `ON` | Disable unit tests |
| `-DENABLE_CONNMARKTOS=ON` | `OFF` | Linux netfilter conntrack QoS support |
| `-DENABLE_NFTABLES=ON` | `OFF` | nftables firewall integration |

On macOS, if libraries are installed via Homebrew, specify paths:

```bash
cmake .. -DCMAKE_PREFIX_PATH="/usr/local/opt/mbedtls;/usr/local/opt/libsodium"
```

### Debian & Ubuntu

#### Install from repository (not recommended)

Shadowsocks-libev is available in the official repository for following distributions:

* Debian 8 or higher, including oldoldstable (jessie), old stable (stretch), stable (buster), testing (bullseye) and unstable (sid)
* Ubuntu 16.10 or higher

```bash
sudo apt update
sudo apt install shadowsocks-libev
```

#### Build deb package 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
```

For older systems, building `.deb` packages is not supported.
Please try to build and install directly from source. See the [Linux](#linux) section below.

#### 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:

* Recent Fedora versions (until EOL)
* 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 prerequirements to build from source code:

```bash
yum install epel-release -y
yum install gcc gettext autoconf libtool automake make pcre-devel asciidoc xmlto c-ares-devel libev-devel libsodium-devel mbedtls-devel -y
```

### Archlinux & Manjaro

```bash
sudo pacman -S shadowsocks-libev
```

Please refer to downstream [PKGBUILD](https://github.com/archlinux/svntogit-community/blob/packages/shadowsocks-libev/trunk/PKGBUILD)
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:

* cmake (>= 3.2)
* a C compiler (gcc or clang)
* pkg-config
* libmbedtls
* libsodium (>= 1.0.4)
* libpcre2
* libev
* libc-ares
* asciidoc (for documentation only)
* xmlto (for documentation only)

If your system is too old to provide libmbedtls and libsodium (>= 1.0.4), you will need to either install those libraries manually or upgrade your system.

Install build dependencies for your distribution:

```bash
# Debian / Ubuntu
sudo apt-get install --no-install-recommends build-essential cmake pkg-config \
    libpcre2-dev libev-dev libc-ares-dev libmbedtls-dev libsodium-dev \
    asciidoc xmlto

# CentOS / Fedora / RHEL
sudo yum install gcc cmake make pkg-config pcre2-devel c-ares-devel \
    libev-devel libsodium-devel mbedtls-devel asciidoc xmlto

# Arch
sudo pacman -S gcc cmake make pkg-config pcre2 c-ares libev libsodium mbedtls \
    asciidoc xmlto
```

Then build and install:

```bash
git submodule update --init --recursive
mkdir -p build && cd build
cmake ..
make
sudo make install
```

### FreeBSD
#### Install
Shadowsocks-libev is available in FreeBSD Ports Collection. You can install it in either way, `pkg` or `ports`.

**pkg (recommended)**

```bash
pkg install shadowsocks-libev
```

**ports**

```bash
cd /usr/ports/net/shadowsocks-libev
make install
```

#### Configuration
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"
```

#### Run

Start the Shadowsocks server:

```bash
service shadowsocks_libev start
```

#### Run as client
By default, shadowsocks-libev is running as a server in FreeBSD. If you would like to start shadowsocks-libev in client mode, you can modify the rc script (`/usr/local/etc/rc.d/shadowsocks_libev`) manually.

```
# modify the following line from "ss-server" to "ss-local"
command="/usr/local/bin/ss-local"
```

Note that is simply a workaround, each time you upgrade the port your changes will be overwritten by the new version.

### 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
```

### Windows (MinGW)
To build Windows native binaries, the recommended method is to use Docker:

* On Windows: double-click `make.bat` in `docker\mingw`
* On Unix-like system:

cd shadowsocks-libev/docker/mingw
        make

A tarball with 32-bit and 64-bit binaries will be generated in the same directory.

You could also manually use MinGW-w64 compilers to build in Unix-like shell (MSYS2/Cygwin), or cross-compile on Unix-like systems (Linux/MacOS). Please refer to build scripts in `docker/mingw`.

Currently you need to use a patched libev library for MinGW:

* https://github.com/shadowsocks/libev/archive/mingw.zip

Notice that TCP Fast Open (TFO) is only available on **Windows 10**, **1607** or later version (precisely, build >= 14393). If you are using **1709** (build 16299) or later version, you also need to run the following command in PowerShell/Command Prompt **as Administrator** and **reboot** to use TFO properly:

netsh int tcp set global fastopenfallback=disabled

### Docker

As you expect, simply pull the image and run.
```
docker pull shadowsocks/shadowsocks-libev
docker run -e PASSWORD=<password> -p<server-port>:8388 -p<server-port>:8388/udp -d shadowsocks/shadowsocks-libev
```

More information about the image can be found [here](docker/alpine/README.md).

## 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-ietf-poly1305,
                                  xchacha20-ietf-poly1305,
                                  salsa20, chacha20 and chacha20-ietf.
                                  The default cipher is chacha20-ietf-poly1305.

[-a <user>]                Run as another user.

[-f <pid_file>]            The file path to store pid.

[-t <timeout>]             Socket timeout in seconds.

[-c <config_file>]         The path to config file.

[-n <number>]              Max number of open files.

[-i <interface>]           Network interface to bind.
                                  (not available in redir mode)

[-b <local_address>]       Local address to bind.
                                  For servers: Specify the local address to use 
                                  while this server is making outbound 
                                  connections to remote servers on behalf of the
                                  clients.
                                  For clients: Specify the local address to use 
                                  while this client is making outbound 
                                  connections to the server.

[-u]                       Enable UDP relay.
                                  (TPROXY is required in redir mode)

[-U]                       Enable UDP relay and disable TCP relay.
                                  (not available in local mode)

[-T]                       Use tproxy instead of redirect. (for tcp)
                                  (only available in redir mode)

[-L <addr>:<port>]         Destination server address and port
                                  for local port forwarding.
                                  (only available in tunnel mode)

[-6]                       Resolve hostname to IPv6 address first.

[-d <addr>]                Name servers for internal DNS resolver.
                                  (only available in server mode)

[--reuse-port]             Enable port reuse.

[--fast-open]              Enable TCP fast open.
                                  with Linux kernel > 3.7.0.
                                  (only available in local and server mode)

[--acl <acl_file>]         Path to 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)

[--mtu <MTU>]              MTU of your network interface.

[--mptcp]                  Enable Multipath TCP on MPTCP Kernel.

[--no-delay]               Enable TCP_NODELAY.

[--executable <path>]      Path to the executable of ss-server.
                                  (only available in manager mode)

[-D <path>]                Path to the working directory of ss-manager.
                                  (only available in manager mode)

[--key <key_in_base64>]    Key of your remote server.

[--plugin <name>]          Enable SIP003 plugin. (Experimental)

[--plugin-opts <options>]  Set SIP003 plugin options. (Experimental)

[-v]                       Verbose mode.

## Helper Scripts

### ss-setup

`ss-setup` is an interactive TUI (text user interface) tool for setting up shadowsocks-libev server and client configurations. It uses `whiptail` or `dialog` for the menu interface.

It is installed automatically by `make install` and can also be run directly from `scripts/ss-setup.sh`.

**Prerequisites:** `whiptail` or `dialog`, `openssl` (optional, for password generation)

#### Server setup (with systemd service)

Run as root for full functionality (config + systemd service installation):

```bash
sudo ss-setup
```

This launches an interactive menu that walks you through:
1. Choosing a config instance name
2. Setting the listen address and port (manual or random high port)
3. Selecting an AEAD cipher (chacha20-ietf-poly1305, aes-256-gcm, etc.)
4. Generating or entering a password
5. Configuring timeout, network mode (TCP/UDP), and TCP Fast Open
6. Optionally selecting a SIP003 plugin
7. Installing and starting a systemd service

The config is saved to `/etc/shadowsocks-libev/<name>.json` and a systemd template service `shadowsocks-libev-server@<name>.service` is created.

At the end, it displays a `ss://` URI you can import into clients.

#### Client config generation

Select "Generate ss-local client config" from the main menu. The wizard prompts for the remote server address, port, cipher, password, and local SOCKS5 port, then writes a JSON config:

```bash
# Run without root to generate config in the current directory
ss-setup
# Select: client -> fill in server details -> save

# Then start the client
ss-local -c ~/ss-client.json
```

#### Config-only mode (non-root)

When run without root, `ss-setup` skips service installation and plugin management, but still generates config files in the current directory:

```bash
ss-setup
# Config saved to ./config.json (in current directory)
# Start manually:
ss-server -c ./config.json
```

#### Service management

From the main menu, select "Manage running services" to start, stop, restart, enable/disable, or view logs for any configured instance:

```
sudo ss-setup
# Select: service -> pick instance -> start/stop/restart/logs
```

#### Plugin installation

Select "Install a SIP003 plugin" from the main menu (requires root). Supports automatic download of:
- simple-obfs (build from source or package manager)
- v2ray-plugin (GitHub release)
- xray-plugin (GitHub release)
- kcptun (GitHub release)
- Custom plugin binary

### ss-nat

`ss-nat` is a helper script that sets up iptables NAT rules for `ss-redir` to provide transparent TCP/UDP redirection. It is installed on Linux systems by `make install`.

**Prerequisites:** Linux with `iptables`, `ipset`, and optionally TPROXY kernel module for UDP

#### Basic usage (TCP redirect)

```bash
# Start ss-redir first
ss-redir -s YOUR_SERVER_IP -p 8388 -l 1080 -k PASSWORD -m chacha20-ietf-poly1305 -u

# Set up NAT rules to redirect TCP traffic through ss-redir
sudo ss-nat -s YOUR_SERVER_IP -l 1080
```

#### Enable UDP relay with TPROXY

```bash
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -u
```

#### Apply rules to OUTPUT chain (proxy the local machine itself)

```bash
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -u -o
```

#### Use separate TCP/UDP servers

```bash
sudo ss-nat -s TCP_SERVER_IP -l 1080 -S UDP_SERVER_IP -L 1080 -U
```

#### Bypass specific WAN IPs

```bash
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -b "1.2.3.4 5.6.7.8"
```

#### Use a bypass IP list file

```bash
# Create a file with one IP/CIDR per line
echo "1.2.3.0/24" > /etc/ss-bypass.list
echo "5.6.7.0/24" >> /etc/ss-bypass.list

sudo ss-nat -s YOUR_SERVER_IP -l 1080 -i /etc/ss-bypass.list
```

#### LAN access control

```bash
# Whitelist mode: only proxy traffic from these LAN IPs
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -a "w192.168.1.10 192.168.1.20"

# Blacklist mode: proxy all LAN traffic except these IPs
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -a "b192.168.1.100"
```

#### Flush all rules

```bash
sudo ss-nat -f
```

#### Complete example: transparent proxy gateway

Set up a Linux box as a transparent proxy gateway for the entire LAN:

```bash
# 1. Start ss-redir with UDP relay
ss-redir -s YOUR_SERVER_IP -p 8388 -l 1080 -k PASSWORD \
    -m chacha20-ietf-poly1305 -u -f /var/run/ss-redir.pid

# 2. Set up NAT rules (TCP + UDP, apply to local OUTPUT too)
sudo ss-nat -s YOUR_SERVER_IP -l 1080 -u -o -I eth0

# 3. Point other devices' default gateway to this machine's LAN IP
#    and set their DNS to a public resolver (e.g., 1.1.1.1 or 8.8.8.8)

# To tear down:
sudo ss-nat -f
```

## Transparent proxy (manual iptables)

The latest shadowsocks-libev has provided a *redir* mode. You can configure your Linux-based box or router to proxy all TCP traffic transparently, which is handy if you use an OpenWRT-powered router.

Note: For most use cases, [`ss-nat`](#ss-nat) above is simpler than writing iptables rules manually.

# Create new chain
    iptables -t nat -N SHADOWSOCKS
    iptables -t mangle -N SHADOWSOCKS

# Ignore your shadowsocks server's addresses
    # It's very IMPORTANT, just be careful.
    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.
    iptables -t nat -A SHADOWSOCKS -d 0.0.0.0/8 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 10.0.0.0/8 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 127.0.0.0/8 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 169.254.0.0/16 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 172.16.0.0/12 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 192.168.0.0/16 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 224.0.0.0/4 -j RETURN
    iptables -t nat -A SHADOWSOCKS -d 240.0.0.0/4 -j RETURN

# Anything else should be redirected to shadowsocks's local port
    iptables -t nat -A SHADOWSOCKS -p tcp -j REDIRECT --to-ports 12345

# Add any UDP rules
    ip route add local default dev lo table 100
    ip rule add fwmark 1 lookup 100
    iptables -t mangle -A SHADOWSOCKS -p udp --dport 53 -j TPROXY --on-port 12345 --tproxy-mark 0x01/0x01

# Apply the rules
    iptables -t nat -A PREROUTING -p tcp -j SHADOWSOCKS
    iptables -t mangle -A PREROUTING -j SHADOWSOCKS

# Start the shadowsocks-redir
    ss-redir -u -c /etc/config/shadowsocks.json -f /var/run/shadowsocks.pid

## Transparent proxy (pure tproxy)

Executing this script on the linux host can proxy all outgoing traffic of this machine (except the traffic sent to the reserved address). Other hosts under the same LAN can also change their default gateway to the ip of this linux host (at the same time change the dns server to 1.1.1.1 or 8.8.8.8, etc.) to proxy their outgoing traffic.

> Of course, the ipv6 proxy is similar, just change `iptables` to `ip6tables`, `ip` to `ip -6`, `127.0.0.1` to `::1`, and other details.

```shell
#!/bin/bash

start_ssredir() {
    # please modify MyIP, MyPort, etc.
    (ss-redir -s MyIP -p MyPort -m MyMethod -k MyPasswd -b 127.0.0.1 -l 60080 --no-delay -u -T -v </dev/null &>>/var/log/ss-redir.log &)
}

stop_ssredir() {
    kill -9 $(pidof ss-redir) &>/dev/null
}

start_iptables() {
    ##################### SSREDIR #####################
    iptables -t mangle -N SSREDIR

# connection-mark -> packet-mark
    iptables -t mangle -A SSREDIR -j CONNMARK --restore-mark
    iptables -t mangle -A SSREDIR -m mark --mark 0x2333 -j RETURN

# please modify MyIP, MyPort, etc.
    # ignore traffic sent to ss-server
    iptables -t mangle -A SSREDIR -p tcp -d MyIP --dport MyPort -j RETURN
    iptables -t mangle -A SSREDIR -p udp -d MyIP --dport MyPort -j RETURN

# ignore traffic sent to reserved addresses
    iptables -t mangle -A SSREDIR -d 0.0.0.0/8          -j RETURN
    iptables -t mangle -A SSREDIR -d 10.0.0.0/8         -j RETURN
    iptables -t mangle -A SSREDIR -d 100.64.0.0/10      -j RETURN
    iptables -t mangle -A SSREDIR -d 127.0.0.0/8        -j RETURN
    iptables -t mangle -A SSREDIR -d 169.254.0.0/16     -j RETURN
    iptables -t mangle -A SSREDIR -d 172.16.0.0/12      -j RETURN
    iptables -t mangle -A SSREDIR -d 192.0.0.0/24       -j RETURN
    iptables -t mangle -A SSREDIR -d 192.0.2.0/24       -j RETURN
    iptables -t mangle -A SSREDIR -d 192.88.99.0/24     -j RETURN
    iptables -t mangle -A SSREDIR -d 192.168.0.0/16     -j RETURN
    iptables -t mangle -A SSREDIR -d 198.18.0.0/15      -j RETURN
    iptables -t mangle -A SSREDIR -d 198.51.100.0/24    -j RETURN
    iptables -t mangle -A SSREDIR -d 203.0.113.0/24     -j RETURN
    iptables -t mangle -A SSREDIR -d 224.0.0.0/4        -j RETURN
    iptables -t mangle -A SSREDIR -d 240.0.0.0/4        -j RETURN
    iptables -t mangle -A SSREDIR -d 255.255.255.255/32 -j RETURN

# mark the first packet of the connection
    iptables -t mangle -A SSREDIR -p tcp --syn                      -j MARK --set-mark 0x2333
    iptables -t mangle -A SSREDIR -p udp -m conntrack --ctstate NEW -j MARK --set-mark 0x2333

# packet-mark -> connection-mark
    iptables -t mangle -A SSREDIR -j CONNMARK --save-mark

##################### OUTPUT #####################
    # proxy the outgoing traffic from this machine
    iptables -t mangle -A OUTPUT -p tcp -m addrtype --src-type LOCAL ! --dst-type LOCAL -j SSREDIR
    iptables -t mangle -A OUTPUT -p udp -m addrtype --src-type LOCAL ! --dst-type LOCAL -j SSREDIR

##################### PREROUTING #####################
    # proxy traffic passing through this machine (other->other)
    iptables -t mangle -A PREROUTING -p tcp -m addrtype ! --src-type LOCAL ! --dst-type LOCAL -j SSREDIR
    iptables -t mangle -A PREROUTING -p udp -m addrtype ! --src-type LOCAL ! --dst-type LOCAL -j SSREDIR

# hand over the marked package to TPROXY for processing
    iptables -t mangle -A PREROUTING -p tcp -m mark --mark 0x2333 -j TPROXY --on-ip 127.0.0.1 --on-port 60080
    iptables -t mangle -A PREROUTING -p udp -m mark --mark 0x2333 -j TPROXY --on-ip 127.0.0.1 --on-port 60080
}

stop_iptables() {
    ##################### PREROUTING #####################
    iptables -t mangle -D PREROUTING -p tcp -m mark --mark 0x2333 -j TPROXY --on-ip 127.0.0.1 --on-port 60080 &>/dev/null
    iptables -t mangle -D PREROUTING -p udp -m mark --mark 0x2333 -j TPROXY --on-ip 127.0.0.1 --on-port 60080 &>/dev/null

iptables -t mangle -D PREROUTING -p tcp -m addrtype ! --src-type LOCAL ! --dst-type LOCAL -j SSREDIR &>/dev/null
    iptables -t mangle -D PREROUTING -p udp -m addrtype ! --src-type LOCAL ! --dst-type LOCAL -j SSREDIR &>/dev/null

##################### OUTPUT #####################
    iptables -t mangle -D OUTPUT -p tcp -m addrtype --src-type LOCAL ! --dst-type LOCAL -j SSREDIR &>/dev/null
    iptables -t mangle -D OUTPUT -p udp -m addrtype --src-type LOCAL ! --dst-type LOCAL -j SSREDIR &>/dev/null

##################### SSREDIR #####################
    iptables -t mangle -F SSREDIR &>/dev/null
    iptables -t mangle -X SSREDIR &>/dev/null
}

start_iproute2() {
    ip route add local default dev lo table 100
    ip rule  add fwmark 0x2333        table 100
}

stop_iproute2() {
    ip rule  del   table 100 &>/dev/null
    ip route flush table 100 &>/dev/null
}

start_resolvconf() {
    # or nameserver 8.8.8.8, etc.
    echo "nameserver 1.1.1.1" >/etc/resolv.conf
}

stop_resolvconf() {
    echo "nameserver 114.114.114.114" >/etc/resolv.conf
}

start() {
    echo "start ..."
    start_ssredir
    start_iptables
    start_iproute2
    start_resolvconf
    echo "start end"
}

stop() {
    echo "stop ..."
    stop_resolvconf
    stop_iproute2
    stop_iptables
    stop_ssredir
    echo "stop end"
}

restart() {
    stop
    sleep 1
    start
}

main() {
    if [ $# -eq 0 ]; then
        echo "usage: $0 start|stop|restart ..."
        return 1
    fi

for funcname in "$@"; do
        if [ "$(type -t $funcname)" != 'function' ]; then
            echo "'$funcname' not a shell function"
            return 1
        fi
    done

for funcname in "$@"; do
        $funcname
    done
    return 0
}
main "$@"
```

## Security Tips

For any public server, to avoid users accessing localhost of your server, please add `--acl acl/server_block_local.acl` to the command line.

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>
           2013-2018, 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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