Clash

A rule-based tunnel in Go.

Features

• Local HTTP/HTTPS/SOCKS server with authentication support
• VMess, Shadowsocks, Trojan, Snell protocol support for remote connections
• Built-in DNS server that aims to minimize DNS pollution attack impact, supports DoH/DoT upstream and fake IP.
• Rules based off domains, GEOIP, IPCIDR or Process to forward packets to different nodes
• Remote groups allow users to implement powerful rules. Supports automatic fallback, load balancing or auto select node based off latency
• Remote providers, allowing users to get node lists remotely instead of hardcoding in config
• Netfilter TCP redirecting. Deploy Clash on your Internet gateway with iptables.
• Comprehensive HTTP RESTful API controller

Getting Started

Documentations are now moved to GitHub Wiki.

Advanced usage for this branch

DNS configuration

Support resolve ip with a proxy tunnel.

Support geosite with fallback-filter.

dns:
  enable: true
  use-hosts: true
  ipv6: false
  enhanced-mode: fake-ip
  fake-ip-range: 198.18.0.1/16
  listen: 127.0.0.1:6868
  default-nameserver:
    - 119.29.29.29
    - 114.114.114.114
  nameserver:
    - https://doh.pub/dns-query
    - tls://223.5.5.5:853
  fallback:
    - 'https://1.0.0.1/dns-query#Proxy'  # append the proxy adapter name to the end of DNS URL with '#' prefix.
    - 'tls://8.8.4.4:853#Proxy'
  fallback-filter:
    geoip: false
    geosite:
      - gfw  # `geosite` filter only use fallback server to resolve ip, prevent DNS leaks to untrusted DNS providers.
    domain:
      - +.example.com
    ipcidr:
      - 0.0.0.0/32

TUN configuration

Supports macOS, Linux and Windows.

On Windows, you should download the Wintun driver and copy wintun.dll into the system32 directory.

# Enable the TUN listener
tun:
  enable: true
  stack: gvisor # System or gVisor
  # device: tun://utun8 # or fd://xxx, it's optional
  dns-hijack: 
    - 0.0.0.0:53 # hijack all public
  auto-route: true # auto set global route

Rules configuration

• Support rule GEOSITE.
• Support multiport condition for rule SRC-PORT and DST-PORT.
• Support network condition for all rules.
• Support process condition for all rules.
• Support source IPCIDR condition for all rules, just append to the end.

The GEOIP databases via https://github.com/Loyalsoldier/geoip.

The GEOSITE databases via https://github.com/Loyalsoldier/v2ray-rules-dat.

rules:
  # network condition for all rules
  - DOMAIN-SUFFIX,example.com,DIRECT,tcp
  - DOMAIN-SUFFIX,example.com,REJECT,udp

  # process condition for all rules (add 'P:' prefix)
  - DOMAIN-SUFFIX,example.com,REJECT,P:Google Chrome Helper

  # multiport condition for rules SRC-PORT and DST-PORT
  - DST-PORT,123/136/137-139,DIRECT,udp
  
  # rule GEOSITE
  - GEOSITE,category-ads-all,REJECT
  - GEOSITE,icloud@cn,DIRECT
  - GEOSITE,apple@cn,DIRECT
  - GEOSITE,apple-cn,DIRECT
  - GEOSITE,microsoft@cn,DIRECT
  - GEOSITE,facebook,PROXY
  - GEOSITE,youtube,PROXY
  - GEOSITE,geolocation-cn,DIRECT
  - GEOSITE,geolocation-!cn,PROXY

  # source IPCIDR condition for all rules in gateway proxy
  #- GEOSITE,geolocation-!cn,REJECT,192.168.1.88/32,192.168.1.99/32
  
  - GEOIP,telegram,PROXY,no-resolve
  - GEOIP,lan,DIRECT,no-resolve
  - GEOIP,cn,DIRECT

  - MATCH,PROXY

Proxies configuration

Support outbound transport protocol VLESS.

The XTLS only support TCP transport by the XRAY-CORE.

proxies:
  - name: "vless-tcp"
    type: vless
    server: server
    port: 443
    uuid: uuid
    network: tcp
    servername: example.com
    # flow: xtls-rprx-direct # xtls-rprx-origin  # enable XTLS
    # skip-cert-verify: true

IPTABLES auto-configuration

Only work on Linux OS who support iptables, Clash will auto-configuration iptables for tproxy listener when tproxy-port value isn't zero.

If TPROXY is enabled, the TUN must be disabled.

# Enable the TPROXY listener
tproxy-port: 9898
# Disable the TUN listener
tun:
  enable: false

Run Clash as a daemon.

Create the systemd configuration file at /etc/systemd/system/clash.service:

[Unit]
Description=Clash daemon, A rule-based proxy in Go.
After=network.target

[Service]
Type=simple
CapabilityBoundingSet=cap_net_admin
Restart=always
ExecStart=/usr/local/bin/clash -d /etc/clash

[Install]
WantedBy=multi-user.target

Launch clashd on system startup with:

$ systemctl enable clash

Launch clashd immediately with:

$ systemctl start clash

Display Process name

Add field Process to Metadata and prepare to get process name for Restful API GET /connections.

To display process name in GUI please use https://yaling888.github.io/yacd/.

Development

If you want to build an application that uses clash as a library, check out the the GitHub Wiki

Credits

• riobard/go-shadowsocks2
• v2ray/v2ray-core
• WireGuard/wireguard-go

License

This software is released under the GPL-3.0 license.