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](https://github.com/Dreamacro/clash/wiki).
## Advanced usage for this branch
### DNS configuration
Support resolve ip with a proxy tunnel.
Support `geosite` with `fallback-filter`.
```yaml
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 unsafe DNS providers.
domain:
- +.example.com
ipcidr:
- 0.0.0.0/32
```
### TUN configuration
Supports macOS, Linux and Windows.
Support lwIP stack, a lightweight TCP/IP stack, it's recommended set to tun.
On Windows, you should download the [Wintun](https://www.wintun.net) driver and copy `wintun.dll` into Clash home directory.
```yaml
# Enable the TUN listener
tun:
enable: true
stack: lwip # lwip(recommended), system or gvisor
dns-listen: 0.0.0.0:53 # additional dns server listen on TUN
auto-route: true # auto set global route
```
### Rules configuration
- Support rule `GEOSITE`.
- Support rule `SCRIPT`.
- Support `multiport` condition for rule `SRC-PORT` and `DST-PORT`.
- Support `network` condition for all rules.
- Support source IPCIDR condition for all rules, just append to the end.
The `GEOSITE` databases via https://github.com/Loyalsoldier/v2ray-rules-dat.
```yaml
mode: rule
script:
shortcuts:
quic: 'network == "udp" and dst_port == 443'
privacy: '"analytics" in host or "adservice" in host or "firebase" in host or "safebrowsing" in host or "doubleclick" in host'
rules:
# rule SCRIPT
- SCRIPT,quic,REJECT # Disable QUIC, same as rule "DST-PORT,443,REJECT,udp"
- SCRIPT,privacy,REJECT
# network(tcp/udp) condition for all rules
- DOMAIN-SUFFIX,bilibili.com,DIRECT,tcp
- DOMAIN-SUFFIX,bilibili.com,REJECT,udp
# 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,private,DIRECT,no-resolve
- GEOIP,cn,DIRECT
- MATCH,PROXY
```
### Script configuration
Script enables users to programmatically select a policy for the packets with more flexibility.
```yaml
mode: script
rules:
# the rule GEOSITE just as a rule provider in mode script
- GEOSITE,category-ads-all,Whatever
- GEOSITE,youtube,Whatever
- GEOSITE,geolocation-cn,Whatever
script:
code: |
def main(ctx, metadata):
if metadata["process_name"] == 'apsd':
return "DIRECT"
if metadata["network"] == 'udp' and metadata["dst_port"] == 443:
return "REJECT"
host = metadata["host"]
for kw in ['analytics', 'adservice', 'firebase', 'bugly', 'safebrowsing', 'doubleclick']:
if kw in host:
return "REJECT"
now = time.now()
if (now.hour < 8 or now.hour > 17) and metadata["src_ip"] == '192.168.1.99':
return "REJECT"
if ctx.rule_providers["geosite:category-ads-all"].match(metadata):
return "REJECT"
if ctx.rule_providers["geosite:youtube"].match(metadata):
ctx.log('[Script] domain %s matched youtube' % host)
return "Proxy"
if ctx.rule_providers["geosite:geolocation-cn"].match(metadata):
ctx.log('[Script] domain %s matched geolocation-cn' % host)
return "DIRECT"
ip = metadata["dst_ip"]
if host != "":
ip = ctx.resolve_ip(host)
if ip == "":
return "Proxy"
code = ctx.geoip(ip)
if code == "LAN" or code == "CN":
return "DIRECT"
return "Proxy" # default policy for requests which are not matched by any other script
```
the context and metadata
```ts
interface Metadata {
type: string // socks5、http
network: string // tcp
host: string
process_name: string
src_ip: string
src_port: int
dst_ip: string
dst_port: int
}
interface Context {
resolve_ip: (host: string) => string // ip string
geoip: (ip: string) => string // country code
log: (log: string) => void
rule_providers: Record boolean }>
}
```
### Proxies configuration
Support outbound transport protocol `VLESS`.
The XTLS only support TCP transport by the XRAY-CORE.
```yaml
proxies:
- name: "vless-tcp"
type: vless
server: server
port: 443
uuid: uuid
network: tcp
servername: example.com # AKA SNI
# flow: xtls-rprx-direct # xtls-rprx-origin # enable XTLS
# skip-cert-verify: true
- name: "vless-ws"
type: vless
server: server
port: 443
uuid: uuid
udp: true
network: ws
servername: example.com # priority over wss host
# skip-cert-verify: true
ws-path: /path
ws-headers:
Host: example.com
```
### 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.
```yaml
# Enable the TPROXY listener
tproxy-port: 9898
# Disable the TUN listener
tun:
enable: false
```
Create user given name `clash`.
Run Clash by user `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
User=clash
Group=clash
CapabilityBoundingSet=cap_net_admin
AmbientCapabilities=cap_net_admin
Restart=always
ExecStart=/usr/local/bin/clash -d /etc/clash
[Install]
WantedBy=multi-user.target
```
Launch clashd on system startup with:
```shell
$ systemctl enable clash
```
Launch clashd immediately with:
```shell
$ systemctl start clash
```
### Display Process name
Clash 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](https://github.com/Dreamacro/clash/wiki/use-clash-as-a-library)
## Credits
* [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
* [v2ray/v2ray-core](https://github.com/v2ray/v2ray-core)
* [WireGuard/wireguard-go](https://github.com/WireGuard/wireguard-go)
## License
This software is released under the GPL-3.0 license.
[](https://app.fossa.io/projects/git%2Bgithub.com%2FDreamacro%2Fclash?ref=badge_large)