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glider is a forward proxy with multiple protocols support, and also a dns/dhcp server with ipset management features.

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# [glider](https://github.com/nadoo/glider)

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glider is a forward proxy with multiple protocols support, and also a dns/dhcp server with ipset management features.

we can set up local listeners as proxy servers, and forward requests to internet via forwarders.

## Features
- Act as both proxy client and proxy server(protocol converter)
- Flexible proxy & protocol chains
- Load balancing with the following scheduling algorithm:
  - rr: round robin
  - ha: high availability 
  - lha: latency based high availability
  - dh: destination hashing
- Rule & priority based forwarder choosing: [Config Examples](config/examples)
- DNS forwarding server:
  - dns over proxy
  - force upstream querying by tcp
  - association rules between dns and forwarder choosing
  - association rules between dns and ipset
  - dns cache support
  - custom dns record
- IPSet management (linux kernel version >= 2.6.32):
  - add ip/cidrs from rule files on startup
  - add resolved ips for domains from rule files by dns forwarding server
- Serve http and socks5 on the same port
- Periodical availability checking for forwarders
- Send requests from specific local ip/interface
- Services: 
  - dhcpd: a simple dhcp server that can run in failover mode

## Protocols

<details>
<summary>click to see details</summary>

|Protocol       | Listen/TCP |  Listen/UDP | Forward/TCP | Forward/UDP | Description
|:-:            |:-:|:-:|:-:|:-:|:-
|Mixed          |√|√| | |http+socks5 server
|HTTP           |√| |√| |client & server
|SOCKS5         |√|√|√|√|client & server
|SS             |√|√|√|√|client & server
|Trojan         |√| |√|√|client & server
|Trojanc        |√| |√|√|trojan cleartext(without tls)
|AnyTLS         |√| |√|√|client & server
|AnyTLSc        |√| |√|√|anytls cleartext(without tls)
|VLESS          |√| |√|√|client & server
|VMess          | | |√|√|client only
|SSH            | | |√| |client only
|SOCKS4         | | |√| |client only
|SOCKS4A        | | |√| |client only
|TCP            |√| |√| |tcp tunnel client & server
|UDP            | |√| |√|udp tunnel client & server
|TLS            |√| |√| |transport client & server
|KCP            | |√|√| |transport client & server
|Unix           |√|√|√|√|transport client & server
|VSOCK          |√| |√| |transport client & server
|Smux           |√| |√| |transport client & server
|Websocket(WS)  |√| |√| |transport client & server
|WS Secure      |√| |√| |websocket secure (wss)
|Proxy Protocol |√| | | |version 1 server only
|Simple-Obfs    | | |√| |transport client only
|Redir          |√| | | |linux redirect proxy
|Redir6         |√| | | |linux redirect proxy(ipv6)
|TProxy         | |√| | |linux tproxy(udp only)
|Reject         | | |√|√|reject all requests

</details>

## Install

- Binary: [https://github.com/nadoo/glider/releases](https://github.com/nadoo/glider/releases)
- Docker: `docker pull nadoo/glider`
- Manjaro: `pamac install glider`
- ArchLinux: `sudo pacman -S glider`
- Homebrew: `brew install glider`
- MacPorts: `sudo port install glider`
- Source: `go install github.com/nadoo/glider@latest`

## Usage

#### Run

```bash
glider -verbose -listen :8443
# docker run --rm -it nadoo/glider -verbose -listen :8443
```

#### Help

<details>
<summary><code>glider -help</code></summary>

```bash
Usage: glider [-listen URL]... [-forward URL]... [OPTION]...

e.g. glider -config /etc/glider/glider.conf
       glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080 -verbose

OPTION:
  -check string
        check=tcp[://HOST:PORT]: tcp port connect check
        check=http://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
        check=https://HOST[:PORT][/URI][#expect=REGEX_MATCH_IN_RESP_LINE]
        check=file://SCRIPT_PATH: run a check script, healthy when exitcode=0, env vars: FORWARDER_ADDR,FORWARDER_URL
        check=disable: disable health check (default "http://www.msftconnecttest.com/connecttest.txt#expect=200")
  -checkdisabledonly
        check disabled fowarders only
  -checkinterval int
        fowarder check interval(seconds) (default 30)ß
  -checklatencysamples int
        use the average latency of the latest N checks (default 10)
  -checktimeout int
        fowarder check timeout(seconds) (default 10)
  -checktolerance int
        fowarder check tolerance(ms), switch only when new_latency < old_latency - tolerance, only used in lha mode
  -config string
        config file path
  -dialtimeout int
        dial timeout(seconds) (default 3)
  -dns string
        local dns server listen address
  -dnsalwaystcp
        always use tcp to query upstream dns servers no matter there is a forwarder or not
  -dnscachelog
        show query log of dns cache
  -dnscachesize int
        max number of dns response in CACHE (default 4096)
  -dnsmaxttl int
        maximum TTL value for entries in the CACHE(seconds) (default 1800)
  -dnsminttl int
        minimum TTL value for entries in the CACHE(seconds)
  -dnsnoaaaa
        disable AAAA query
  -dnsrecord value
        custom dns record, format: domain/ip
  -dnsserver value
        remote dns server address
  -dnstimeout int
        timeout value used in multiple dnsservers switch(seconds) (default 3)
  -example
        show usage examples
  -forward value
        forward url, see the URL section below
  -include value
        include file
  -interface string
        source ip or source interface
  -listen value
        listen url, see the URL section below
  -logflags int
        do not change it if you do not know what it is, ref: https://pkg.go.dev/log#pkg-constants (default 19)
  -maxfailures int
        max failures to change forwarder status to disabled (default 3)
  -relaytimeout int
        relay timeout(seconds)
  -rulefile value
        rule file path
  -rules-dir string
        rule file folder
  -scheme string
        show help message of proxy scheme, use 'all' to see all schemes
  -service value
        run specified services, format: SERVICE_NAME[,SERVICE_CONFIG]
  -strategy string
        rr: Round Robin mode
        ha: High Availability mode
        lha: Latency based High Availability mode
        dh: Destination Hashing mode (default "rr")
  -tcpbufsize int
        tcp buffer size in Bytes (default 32768)
  -udpbufsize int
        udp buffer size in Bytes (default 2048)
  -verbose
        verbose mode

URL:
   proxy: SCHEME://[USER:PASS@][HOST]:PORT
   chain: proxy,proxy[,proxy]...

e.g. -listen socks5://:1080
         -listen tls://:443?cert=crtFilePath&key=keyFilePath,http://    (protocol chain)

e.g. -forward socks5://server:1080
         -forward tls://server.com:443,http://                          (protocol chain)
         -forward socks5://serverA:1080,socks5://serverB:1080           (proxy chain)

SCHEME:
   listen : anytls anytlsc http kcp mixed pxyproto redir redir6 smux sni socks5 ss tcp tls tproxy trojan trojanc udp unix vless vsock ws wss
   forward: anytls anytlsc direct http kcp reject simple-obfs smux socks4 socks4a socks5 ss ssh tcp tls trojan trojanc udp unix vless vmess vsock ws wss

Note: use 'glider -scheme all' or 'glider -scheme SCHEME' to see help info for the scheme.

--
Forwarder Options: FORWARD_URL#OPTIONS
   priority : the priority of that forwarder, the larger the higher, default: 0
   interface: the local interface or ip address used to connect remote server.

e.g. -forward socks5://server:1080#priority=100
        -forward socks5://server:1080#interface=eth0
        -forward socks5://server:1080#priority=100&interface=192.168.1.99

Services:
   dhcpd: service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
          service=dhcpd-failover,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
     e.g. service=dhcpd,eth1,192.168.1.100,192.168.1.199,720

--
Help:
   glider -help
   glider -scheme all
   glider -example

see README.md and glider.conf.example for more details.
--
glider 0.16.4, https://github.com/nadoo/glider (glider.proxy@gmail.com)
```

</details>

#### Schemes

<details>
<summary><code>glider -scheme all</code></summary>

```bash
Direct scheme:
  direct://

Only needed when you want to specify the outgoing interface:
  glider -verbose -listen :8443 -forward direct://#interface=eth0

Or load balance multiple interfaces directly:
  glider -verbose -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1 -strategy rr

Or you can use the high availability mode:
  glider -verbose -listen :8443 -forward direct://#interface=eth0&priority=100 -forward direct://#interface=eth1&priority=200 -strategy ha

--
Http scheme:
  http://[user:pass@]host:port

--
KCP scheme:
  kcp://CRYPT:KEY@host:port[?dataShards=NUM&parityShards=NUM&mode=MODE]
  
Available crypt types for KCP:
  none, sm4, tea, xor, aes, aes-128, aes-192, blowfish, twofish, cast5, 3des, xtea, salsa20
  
Available modes for KCP:
  fast, fast2, fast3, normal, default: fast

--
Simple-Obfs scheme:
  simple-obfs://host:port[?type=TYPE&host=HOST&uri=URI&ua=UA]
  
Available types for simple-obfs:
  http, tls

--
Reject scheme:
  reject://

--
Smux scheme:
  smux://host:port

--
Socks4 scheme:
  socks4://host:port

--
Socks5 scheme:
  socks5://[user:pass@]host:port

--
SS scheme:
  ss://method:pass@host:port
  
  Available methods for ss:
    AEAD Ciphers:
      AEAD_AES_128_GCM AEAD_AES_192_GCM AEAD_AES_256_GCM AEAD_CHACHA20_POLY1305 AEAD_XCHACHA20_POLY1305
    Stream Ciphers:
      AES-128-CFB AES-128-CTR AES-192-CFB AES-192-CTR AES-256-CFB AES-256-CTR CHACHA20-IETF XCHACHA20 CHACHA20 RC4-MD5
    Alias:
          chacha20-ietf-poly1305 = AEAD_CHACHA20_POLY1305, xchacha20-ietf-poly1305 = AEAD_XCHACHA20_POLY1305
    Plain: NONE

--
SSH scheme:
  ssh://user[:pass]@host:port[?key=keypath&timeout=SECONDS]
    timeout: timeout of ssh handshake and channel operation, default: 5

--
TLS client scheme:
  tls://host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&alpn=proto1][&alpn=proto2]
  
Proxy over tls client:
  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],scheme://
  tls://host:port[?skipVerify=true],http://[user:pass@]
  tls://host:port[?skipVerify=true],socks5://[user:pass@]
  tls://host:port[?skipVerify=true],vmess://[security:]uuid@?alterID=num
  
TLS server scheme:
  tls://host:port?cert=PATH&key=PATH[&alpn=proto1][&alpn=proto2]
  
Proxy over tls server:
  tls://host:port?cert=PATH&key=PATH,scheme://
  tls://host:port?cert=PATH&key=PATH,http://
  tls://host:port?cert=PATH&key=PATH,socks5://
  tls://host:port?cert=PATH&key=PATH,ss://method:pass@

--
Trojan client scheme:
  trojan://pass@host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH]
  trojanc://pass@host:port     (cleartext, without TLS)
  
Trojan server scheme:
  trojan://pass@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1]
  trojanc://pass@host:port[?fallback=127.0.0.1]     (cleartext, without TLS)

--
AnyTLS client scheme:
  anytls://password@host:port[?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&synackTimeout=10s]
  anytlsc://password@host:port     (cleartext, without TLS)

AnyTLS server scheme:
  anytls://password@host:port?cert=PATH&key=PATH[&fallback=127.0.0.1:80]
  anytlsc://password@host:port[?fallback=127.0.0.1:80]     (cleartext, without TLS)

--
Unix domain socket scheme:
  unix://path

--
VLESS scheme:
  vless://uuid@host:port[?fallback=127.0.0.1:80]

--
VMess scheme:
  vmess://[security:]uuid@host:port[?alterID=num]
    if alterID=0 or not set, VMessAEAD will be enabled
  
  Available security for vmess:
    zero, none, aes-128-gcm, chacha20-poly1305

--
Websocket client scheme:
  ws://host:port[/path][?host=HOST][&origin=ORIGIN]
  wss://host:port[/path][?serverName=SERVERNAME][&skipVerify=true][&cert=PATH][&host=HOST][&origin=ORIGIN]
  
Websocket server scheme:
  ws://:port[/path][?host=HOST]
  wss://:port[/path]?cert=PATH&key=PATH[?host=HOST]
  
Websocket with a specified proxy protocol:
  ws://host:port[/path][?host=HOST],scheme://
  ws://host:port[/path][?host=HOST],http://[user:pass@]
  ws://host:port[/path][?host=HOST],socks5://[user:pass@]
  
TLS and Websocket with a specified proxy protocol:
  tls://host:port[?skipVerify=true][&serverName=SERVERNAME],ws://[@/path[?host=HOST]],scheme://
  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],http://[user:pass@]
  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],socks5://[user:pass@]
  tls://host:port[?skipVerify=true],ws://[@/path[?host=HOST]],vmess://[security:]uuid@?alterID=num

--
VM socket scheme(linux only):
  vsock://[CID]:port

if you want to listen on any address, just set CID to 4294967295.
```

</details>

#### Examples

<details>
<summary><code>glider -example</code></summary>

```bash
Examples:
  glider -config glider.conf
    -run glider with specified config file.
  
  glider -listen :8443 -verbose
    -listen on :8443, serve as http/socks5 proxy on the same port, in verbose mode.

glider -listen socks5://:1080 -listen http://:8080 -verbose
    -multiple listeners: listen on :1080 as socks5 proxy server, and on :8080 as http proxy server.
  
  glider -listen :8443 -forward direct://#interface=eth0 -forward direct://#interface=eth1
    -multiple forwarders: listen on 8443 and forward requests via interface eth0 and eth1 in round robin mode.
  
  glider -listen tls://:443?cert=crtFilePath&key=keyFilePath,http:// -verbose
    -protocol chain: listen on :443 as a https(http over tls) proxy server.
  
  glider -listen http://:8080 -forward socks5://serverA:1080,socks5://serverB:1080
    -proxy chain: listen on :8080 as a http proxy server, forward all requests via forward chain.
  
  glider -listen :8443 -forward socks5://serverA:1080 -forward socks5://serverB:1080#priority=10 -forward socks5://serverC:1080#priority=10
    -forwarder priority: serverA will only be used when serverB and serverC are not available.
  
  glider -listen tcp://:80 -forward tcp://serverA:80
    -tcp tunnel: listen on :80 and forward all requests to serverA:80.
  
  glider -listen udp://:53 -forward socks5://serverA:1080,udp://8.8.8.8:53
    -udp tunnel: listen on :53 and forward all udp requests to 8.8.8.8:53 via remote socks5 server.
  
  glider -verbose -dns=:53 -dnsserver=8.8.8.8:53 -forward socks5://serverA:1080 -dnsrecord=abc.com/1.2.3.4
    -dns over proxy: listen on :53 as dns server, forward to 8.8.8.8:53 via socks5 server.
```

</details>

## Config

```bash
glider -config CONFIG_PATH
```

- [ConfigFile](config)
  - [glider.conf.example](config/glider.conf.example)
  - [office.rule.example](config/rules.d/office.rule.example)
- [Examples](config/examples)
  - [transparent proxy with dnsmasq](config/examples/8.transparent_proxy_with_dnsmasq)
  - [transparent proxy without dnsmasq](config/examples/9.transparent_proxy_without_dnsmasq)

## Service

- dhcpd / dhcpd-failover:
  - service=dhcpd,INTERFACE,START_IP,END_IP,LEASE_MINUTES[,MAC=IP,MAC=IP...]
    - service=dhcpd,eth1,192.168.1.100,192.168.1.199,720,fc:23:34:9e:25:01=192.168.1.101
    - service=dhcpd-failover,eth2,192.168.2.100,192.168.2.199,720
  - note: `dhcpd-failover` only serves requests when there's no other dhcp server exists in lan
    - detect interval: 1min

## Linux Daemon

- systemd: [https://github.com/nadoo/glider/tree/main/systemd](https://github.com/nadoo/glider/tree/main/systemd)

- <details> <summary>docker: click to see details</summary>

- run glider (config file path: /etc/glider/glider.conf)
    ```
    docker run -d --name glider --net host --restart=always \
      -v /etc/glider:/etc/glider \
      -v /etc/localtime:/etc/localtime:ro \
      nadoo/glider -config=/etc/glider/glider.conf
    ```
  - run watchtower if you need auto update
    ```
    docker run -d --name watchtower --restart=always \
      -v /var/run/docker.sock:/var/run/docker.sock \
      containrrr/watchtower --interval 21600 --cleanup \
      glider
    ```
  - open udp ports if you need udp nat fullcone
    ```
    iptables -I INPUT -p udp -m udp --dport 1024:65535 -j ACCEPT
    ```
  
  </details>

## Customize Build

<details><summary>You can customize and build glider if you want a smaller binary (click to see details)</summary>

1. Clone the source code:
  ```bash
  git clone https://github.com/nadoo/glider && cd glider
  ```
2. Customize features:

```bash
  open `feature.go` & `feature_linux.go`, comment out the packages you don't need
  // _ "github.com/nadoo/glider/proxy/kcp"
  ```

3. Build it:
  ```bash
  go build -v -ldflags "-s -w"
  ```

</details>

## Proxy & Protocol Chains
<details><summary>In glider, you can easily chain several proxy servers or protocols together (click to see details)</summary>

- Chain proxy servers:

```bash
  forward=http://1.1.1.1:80,socks5://2.2.2.2:1080,ss://method:pass@3.3.3.3:8443@
  ```

- Chain protocols: https proxy (http over tls)

```bash
  forward=tls://server.com:443,http://
  ```

- Chain protocols: vmess over ws over tls

```bash
  forward=tls://server.com:443,ws://,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@?alterID=2
  ```

- Chain protocols and servers:

``` bash
  forward=socks5://1.1.1.1:1080,tls://server.com:443,vmess://5a146038-0b56-4e95-b1dc-5c6f5a32cd98@?alterID=2
  ```

- Chain protocols in listener: https proxy server

``` bash
  listen=tls://:443?cert=crtFilePath&key=keyFilePath,http://
  ```

- Chain protocols in listener: http over smux over websocket proxy server

``` bash
  listen=ws://:10000,smux://,http://
  ```

</details>

## Links

- [ipset](https://github.com/nadoo/ipset): netlink ipset package for Go.
- [conflag](https://github.com/nadoo/conflag): a drop-in replacement for Go's standard flag package with config file support.
- [ArchLinux](https://archlinux.org/packages/extra/x86_64/glider): a great linux distribution with glider pre-built package.
- [urlencode](https://www.w3schools.com/tags/ref_urlencode.asp): you should encode special characters in scheme url. e.g., `@`->`%40`

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