# frp [![Build Status](https://travis-ci.org/fatedier/frp.svg?branch=master)](https://travis-ci.org/fatedier/frp) [README](README.md) | [中文文档](README_zh.md) ## What is frp? frp is a fast reverse proxy to help you expose a local server behind a NAT or firewall to the Internet. As of now, it supports **TCP** and **UDP**, as well as **HTTP** and **HTTPS** protocols, where requests can be forwarded to internal services by domain name. frp also has a P2P connect mode. ## Table of Contents * [Development Status](#development-status) * [Architecture](#architecture) * [Example Usage](#example-usage) * [Access your computer in LAN by SSH](#access-your-computer-in-lan-by-ssh) * [Visit your web service in LAN by custom domains](#visit-your-web-service-in-lan-by-custom-domains) * [Forward DNS query request](#forward-dns-query-request) * [Forward Unix domain socket](#forward-unix-domain-socket) * [Expose a simple HTTP file server](#expose-a-simple-http-file-server) * [Enable HTTPS for local HTTP service](#enable-https-for-local-http-service) * [Expose your service privately](#expose-your-service-privately) * [P2P Mode](#p2p-mode) * [Features](#features) * [Configuration Files](#configuration-files) * [Using Environment Variables](#using-environment-variables) * [Dashboard](#dashboard) * [Admin UI](#admin-ui) * [Monitor](#monitor) * [Prometheus](#prometheus) * [Authenticating the Client](#authenticating-the-client) * [Token Authentication](#token-authentication) * [OIDC Authentication](#oidc-authentication) * [Encryption and Compression](#encryption-and-compression) * [TLS](#tls) * [Hot-Reloading frpc configuration](#hot-reloading-frpc-configuration) * [Get proxy status from client](#get-proxy-status-from-client) * [Only allowing certain ports on the server](#only-allowing-certain-ports-on-the-server) * [Port Reuse](#port-reuse) * [Bandwidth Limit](#bandwidth-limit) * [For Each Proxy](#for-each-proxy) * [TCP Stream Multiplexing](#tcp-stream-multiplexing) * [Support KCP Protocol](#support-kcp-protocol) * [Connection Pooling](#connection-pooling) * [Load balancing](#load-balancing) * [Service Health Check](#service-health-check) * [Rewriting the HTTP Host Header](#rewriting-the-http-host-header) * [Setting other HTTP Headers](#setting-other-http-headers) * [Get Real IP](#get-real-ip) * [HTTP X-Forwarded-For](#http-x-forwarded-for) * [Proxy Protocol](#proxy-protocol) * [Require HTTP Basic Auth (Password) for Web Services](#require-http-basic-auth-password-for-web-services) * [Custom Subdomain Names](#custom-subdomain-names) * [URL Routing](#url-routing) * [TCP Port Multiplexing](#tcp-port-multiplexing) * [Connecting to frps via HTTP PROXY](#connecting-to-frps-via-http-proxy) * [Range ports mapping](#range-ports-mapping) * [Client Plugins](#client-plugins) * [Server Manage Plugins](#server-manage-plugins) * [Development Plan](#development-plan) * [Contributing](#contributing) * [Donation](#donation) * [AliPay](#alipay) * [Wechat Pay](#wechat-pay) * [Paypal](#paypal) ## Development Status frp is under development. Try the latest release version in the `master` branch, or use the `dev` branch for the version in development. **The protocol might change at a release and we don't promise backwards compatibility. Please check the release log when upgrading the client and the server.** ## Architecture ![architecture](/doc/pic/architecture.png) ## Example Usage Firstly, download the latest programs from [Release](https://github.com/fatedier/frp/releases) page according to your operating system and architecture. Put `frps` and `frps.ini` onto your server A with public IP. Put `frpc` and `frpc.ini` onto your server B in LAN (that can't be connected from public Internet). ### Access your computer in LAN by SSH 1. Modify `frps.ini` on server A: ```ini # frps.ini [common] bind_port = 7000 ``` 2. Start `frps` on server A: `./frps -c ./frps.ini` 3. On server B, modify `frpc.ini` to put in your `frps` server public IP as `server_addr` field: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [ssh] type = tcp local_ip = 127.0.0.1 local_port = 22 remote_port = 6000 ``` 4. Start `frpc` on server B: `./frpc -c ./frpc.ini` 5. From another machine, SSH to server B like this (assuming that username is `test`): `ssh -oPort=6000 test@x.x.x.x` ### Visit your web service in LAN by custom domains Sometimes we want to expose a local web service behind a NAT network to others for testing with your own domain name and unfortunately we can't resolve a domain name to a local IP. However, we can expose an HTTP(S) service using frp. 1. Modify `frps.ini`, set the vhost HTTP port to 8080: ```ini # frps.ini [common] bind_port = 7000 vhost_http_port = 8080 ``` 2. Start `frps`: `./frps -c ./frps.ini` 3. Modify `frpc.ini` and set `server_addr` to the IP address of the remote frps server. The `local_port` is the port of your web service: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [web] type = http local_port = 80 custom_domains = www.example.com ``` 4. Start `frpc`: `./frpc -c ./frpc.ini` 5. Resolve A record of `www.example.com` to the public IP of the remote frps server or CNAME record to your origin domain. 6. Now visit your local web service using url `http://www.example.com:8080`. ### Forward DNS query request 1. Modify `frps.ini`: ```ini # frps.ini [common] bind_port = 7000 ``` 2. Start `frps`: `./frps -c ./frps.ini` 3. Modify `frpc.ini` and set `server_addr` to the IP address of the remote frps server, forward DNS query request to Google Public DNS server `8.8.8.8:53`: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [dns] type = udp local_ip = 8.8.8.8 local_port = 53 remote_port = 6000 ``` 4. Start frpc: `./frpc -c ./frpc.ini` 5. Test DNS resolution using `dig` command: `dig @x.x.x.x -p 6000 www.google.com` ### Forward Unix domain socket Expose a Unix domain socket (e.g. the Docker daemon socket) as TCP. Configure `frps` same as above. 1. Start `frpc` with configuration: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [unix_domain_socket] type = tcp remote_port = 6000 plugin = unix_domain_socket plugin_unix_path = /var/run/docker.sock ``` 2. Test: Get Docker version using `curl`: `curl http://x.x.x.x:6000/version` ### Expose a simple HTTP file server Browser your files stored in the LAN, from public Internet. Configure `frps` same as above. 1. Start `frpc` with configuration: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [test_static_file] type = tcp remote_port = 6000 plugin = static_file plugin_local_path = /tmp/files plugin_strip_prefix = static plugin_http_user = abc plugin_http_passwd = abc ``` 2. Visit `http://x.x.x.x:6000/static/` from your browser and specify correct user and password to view files in `/tmp/files` on the `frpc` machine. ### Enable HTTPS for local HTTP service 1. Start `frpc` with configuration: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [test_https2http] type = https custom_domains = test.example.com plugin = https2http plugin_local_addr = 127.0.0.1:80 plugin_crt_path = ./server.crt plugin_key_path = ./server.key plugin_host_header_rewrite = 127.0.0.1 plugin_header_X-From-Where = frp ``` 2. Visit `https://test.example.com`. ### Expose your service privately Some services will be at risk if exposed directly to the public network. With **STCP** (secret TCP) mode, a preshared key is needed to access the service from another client. Configure `frps` same as above. 1. Start `frpc` on machine B with the following config. This example is for exposing the SSH service (port 22), and note the `sk` field for the preshared key, and that the `remote_port` field is removed here: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [secret_ssh] type = stcp sk = abcdefg local_ip = 127.0.0.1 local_port = 22 ``` 2. Start another `frpc` (typically on another machine C) with the following config to access the SSH service with a security key (`sk` field): ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [secret_ssh_visitor] type = stcp role = visitor server_name = secret_ssh sk = abcdefg bind_addr = 127.0.0.1 bind_port = 6000 ``` 3. On machine C, connect to SSH on machine B, using this command: `ssh -oPort=6000 127.0.0.1` ### P2P Mode **xtcp** is designed for transmitting large amounts of data directly between clients. A frps server is still needed, as P2P here only refers the actual data transmission. Note it can't penetrate all types of NAT devices. You might want to fallback to **stcp** if **xtcp** doesn't work. 1. In `frps.ini` configure a UDP port for xtcp: ```ini # frps.ini bind_udp_port = 7001 ``` 2. Start `frpc` on machine B, expose the SSH port. Note that `remote_port` field is removed: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [p2p_ssh] type = xtcp sk = abcdefg local_ip = 127.0.0.1 local_port = 22 ``` 3. Start another `frpc` (typically on another machine C) with the config to connect to SSH using P2P mode: ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [p2p_ssh_visitor] type = xtcp role = visitor server_name = p2p_ssh sk = abcdefg bind_addr = 127.0.0.1 bind_port = 6000 ``` 4. On machine C, connect to SSH on machine B, using this command: `ssh -oPort=6000 127.0.0.1` ## Features ### Configuration Files Read the full example configuration files to find out even more features not described here. [Full configuration file for frps (Server)](./conf/frps_full.ini) [Full configuration file for frpc (Client)](./conf/frpc_full.ini) ### Using Environment Variables Environment variables can be referenced in the configuration file, using Go's standard format: ```ini # frpc.ini [common] server_addr = {{ .Envs.FRP_SERVER_ADDR }} server_port = 7000 [ssh] type = tcp local_ip = 127.0.0.1 local_port = 22 remote_port = {{ .Envs.FRP_SSH_REMOTE_PORT }} ``` With the config above, variables can be passed into `frpc` program like this: ``` export FRP_SERVER_ADDR="x.x.x.x" export FRP_SSH_REMOTE_PORT="6000" ./frpc -c ./frpc.ini ``` `frpc` will render configuration file template using OS environment variables. Remember to prefix your reference with `.Envs`. ### Dashboard Check frp's status and proxies' statistics information by Dashboard. Configure a port for dashboard to enable this feature: ```ini [common] dashboard_port = 7500 # dashboard's username and password are both optional,if not set, default is admin. dashboard_user = admin dashboard_pwd = admin ``` Then visit `http://[server_addr]:7500` to see the dashboard, with username and password both being `admin` by default. ![dashboard](/doc/pic/dashboard.png) ### Admin UI The Admin UI helps you check and manage frpc's configuration. Configure an address for admin UI to enable this feature: ```ini [common] admin_addr = 127.0.0.1 admin_port = 7400 admin_user = admin admin_pwd = admin ``` Then visit `http://127.0.0.1:7400` to see admin UI, with username and password both being `admin` by default. ### Monitor When dashboard is enabled, frps will save monitor data in cache. It will be cleared after process restart. Prometheus is also supported. #### Prometheus Enable dashboard first, then configure `enable_prometheus = true` in `frps.ini`. `http://{dashboard_addr}/metrics` will provide prometheus monitor data. ### Authenticating the Client There are 2 authentication methods to authenticate frpc with frps. You can decide which one to use by configuring `authentication_method` under `[common]` in `frpc.ini` and `frps.ini`. Configuring `authenticate_heartbeats = true` under `[common]` will use the configured authentication method to add and validate authentication on every heartbeat between frpc and frps. Configuring `authenticate_new_work_conns = true` under `[common]` will do the same for every new work connection between frpc and frps. #### Token Authentication When specifying `authentication_method = token` under `[common]` in `frpc.ini` and `frps.ini` - token based authentication will be used. Make sure to specify the same `token` in the `[common]` section in `frps.ini` and `frpc.ini` for frpc to pass frps validation #### OIDC Authentication When specifying `authentication_method = oidc` under `[common]` in `frpc.ini` and `frps.ini` - OIDC based authentication will be used. OIDC stands for OpenID Connect, and the flow used is called [Client Credentials Grant](https://tools.ietf.org/html/rfc6749#section-4.4). To use this authentication type - configure `frpc.ini` and `frps.ini` as follows: ```ini # frps.ini [common] authentication_method = oidc oidc_issuer = https://example-oidc-issuer.com/ oidc_audience = https://oidc-audience.com/.default ``` ```ini # frpc.ini [common] authentication_method = oidc oidc_client_id = 98692467-37de-409a-9fac-bb2585826f18 # Replace with OIDC client ID oidc_client_secret = oidc_secret oidc_audience = https://oidc-audience.com/.default oidc_token_endpoint_url = https://example-oidc-endpoint.com/oauth2/v2.0/token ``` ### Encryption and Compression The features are off by default. You can turn on encryption and/or compression: ```ini # frpc.ini [ssh] type = tcp local_port = 22 remote_port = 6000 use_encryption = true use_compression = true ``` #### TLS frp supports the TLS protocol between `frpc` and `frps` since v0.25.0. Config `tls_enable = true` in the `[common]` section to `frpc.ini` to enable this feature. For port multiplexing, frp sends a first byte `0x17` to dial a TLS connection. To enforce `frps` to only accept TLS connections - configure `tls_only = true` in the `[common]` section in `frps.ini`. ### Hot-Reloading frpc configuration The `admin_addr` and `admin_port` fields are required for enabling HTTP API: ```ini # frpc.ini [common] admin_addr = 127.0.0.1 admin_port = 7400 ``` Then run command `frpc reload -c ./frpc.ini` and wait for about 10 seconds to let `frpc` create or update or delete proxies. **Note that parameters in [common] section won't be modified except 'start'.** ### Get proxy status from client Use `frpc status -c ./frpc.ini` to get status of all proxies. The `admin_addr` and `admin_port` fields are required for enabling HTTP API. ### Only allowing certain ports on the server `allow_ports` in `frps.ini` is used to avoid abuse of ports: ```ini # frps.ini [common] allow_ports = 2000-3000,3001,3003,4000-50000 ``` `allow_ports` consists of specific ports or port ranges (lowest port number, dash `-`, highest port number), separated by comma `,`. ### Port Reuse `vhost_http_port` and `vhost_https_port` in frps can use same port with `bind_port`. frps will detect the connection's protocol and handle it correspondingly. We would like to try to allow multiple proxies bind a same remote port with different protocols in the future. ### Bandwidth Limit #### For Each Proxy ```ini # frpc.ini [ssh] type = tcp local_port = 22 remote_port = 6000 bandwidth_limit = 1MB ``` Set `bandwidth_limit` in each proxy's configure to enable this feature. Supported units are `MB` and `KB`. ### TCP Stream Multiplexing frp supports tcp stream multiplexing since v0.10.0 like HTTP2 Multiplexing, in which case all logic connections to the same frpc are multiplexed into the same TCP connection. You can disable this feature by modify `frps.ini` and `frpc.ini`: ```ini # frps.ini and frpc.ini, must be same [common] tcp_mux = false ``` ### Support KCP Protocol KCP is a fast and reliable protocol that can achieve the transmission effect of a reduction of the average latency by 30% to 40% and reduction of the maximum delay by a factor of three, at the cost of 10% to 20% more bandwidth wasted than TCP. KCP mode uses UDP as the underlying transport. Using KCP in frp: 1. Enable KCP in frps: ```ini # frps.ini [common] bind_port = 7000 # Specify a UDP port for KCP. kcp_bind_port = 7000 ``` The `kcp_bind_port` number can be the same number as `bind_port`, since `bind_port` field specifies a TCP port. 2. Configure `frpc.ini` to use KCP to connect to frps: ```ini # frpc.ini [common] server_addr = x.x.x.x # Same as the 'kcp_bind_port' in frps.ini server_port = 7000 protocol = kcp ``` ### Connection Pooling By default, frps creates a new frpc connection to the backend service upon a user request. With connection pooling, frps keeps a certain number of pre-established connections, reducing the time needed to establish a connection. This feature is suitable for a large number of short connections. 1. Configure the limit of pool count each proxy can use in `frps.ini`: ```ini # frps.ini [common] max_pool_count = 5 ``` 2. Enable and specify the number of connection pool: ```ini # frpc.ini [common] pool_count = 1 ``` ### Load balancing Load balancing is supported by `group`. This feature is only available for types `tcp` and `http` now. ```ini # frpc.ini [test1] type = tcp local_port = 8080 remote_port = 80 group = web group_key = 123 [test2] type = tcp local_port = 8081 remote_port = 80 group = web group_key = 123 ``` `group_key` is used for authentication. Connections to port 80 will be dispatched to proxies in the same group randomly. For type `tcp`, `remote_port` in the same group should be the same. For type `http`, `custom_domains`, `subdomain`, `locations` should be the same. ### Service Health Check Health check feature can help you achieve high availability with load balancing. Add `health_check_type = tcp` or `health_check_type = http` to enable health check. With health check type **tcp**, the service port will be pinged (TCPing): ```ini # frpc.ini [test1] type = tcp local_port = 22 remote_port = 6000 # Enable TCP health check health_check_type = tcp # TCPing timeout seconds health_check_timeout_s = 3 # If health check failed 3 times in a row, the proxy will be removed from frps health_check_max_failed = 3 # A health check every 10 seconds health_check_interval_s = 10 ``` With health check type **http**, an HTTP request will be sent to the service and an HTTP 2xx OK response is expected: ```ini # frpc.ini [web] type = http local_ip = 127.0.0.1 local_port = 80 custom_domains = test.example.com # Enable HTTP health check health_check_type = http # frpc will send a GET request to '/status' # and expect an HTTP 2xx OK response health_check_url = /status health_check_timeout_s = 3 health_check_max_failed = 3 health_check_interval_s = 10 ``` ### Rewriting the HTTP Host Header By default frp does not modify the tunneled HTTP requests at all as it's a byte-for-byte copy. However, speaking of web servers and HTTP requests, your web server might rely on the `Host` HTTP header to determine the website to be accessed. frp can rewrite the `Host` header when forwarding the HTTP requests, with the `host_header_rewrite` field: ```ini # frpc.ini [web] type = http local_port = 80 custom_domains = test.example.com host_header_rewrite = dev.example.com ``` The HTTP request will have the the `Host` header rewritten to `Host: dev.example.com` when it reaches the actual web server, although the request from the browser probably has `Host: test.example.com`. ### Setting other HTTP Headers Similar to `Host`, You can override other HTTP request headers with proxy type `http`. ```ini # frpc.ini [web] type = http local_port = 80 custom_domains = test.example.com host_header_rewrite = dev.example.com header_X-From-Where = frp ``` Note that parameter(s) prefixed with `header_` will be added to HTTP request headers. In this example, it will set header `X-From-Where: frp` in the HTTP request. ### Get Real IP #### HTTP X-Forwarded-For This feature is for http proxy only. You can get user's real IP from HTTP request headers `X-Forwarded-For` and `X-Real-IP`. #### Proxy Protocol frp supports Proxy Protocol to send user's real IP to local services. It support all types except UDP. Here is an example for https service: ```ini # frpc.ini [web] type = https local_port = 443 custom_domains = test.example.com # now v1 and v2 are supported proxy_protocol_version = v2 ``` You can enable Proxy Protocol support in nginx to expose user's real IP in HTTP header `X-Real-IP`, and then read `X-Real-IP` header in your web service for the real IP. ### Require HTTP Basic Auth (Password) for Web Services Anyone who can guess your tunnel URL can access your local web server unless you protect it with a password. This enforces HTTP Basic Auth on all requests with the username and password specified in frpc's configure file. It can only be enabled when proxy type is http. ```ini # frpc.ini [web] type = http local_port = 80 custom_domains = test.example.com http_user = abc http_pwd = abc ``` Visit `http://test.example.com` in the browser and now you are prompted to enter the username and password. ### Custom Subdomain Names It is convenient to use `subdomain` configure for http and https types when many people share one frps server. ```ini # frps.ini subdomain_host = frps.com ``` Resolve `*.frps.com` to the frps server's IP. This is usually called a Wildcard DNS record. ```ini # frpc.ini [web] type = http local_port = 80 subdomain = test ``` Now you can visit your web service on `test.frps.com`. Note that if `subdomain_host` is not empty, `custom_domains` should not be the subdomain of `subdomain_host`. ### URL Routing frp supports forwarding HTTP requests to different backend web services by url routing. `locations` specifies the prefix of URL used for routing. frps first searches for the most specific prefix location given by literal strings regardless of the listed order. ```ini # frpc.ini [web01] type = http local_port = 80 custom_domains = web.example.com locations = / [web02] type = http local_port = 81 custom_domains = web.example.com locations = /news,/about ``` HTTP requests with URL prefix `/news` or `/about` will be forwarded to **web02** and other requests to **web01**. ### TCP Port Multiplexing frp supports receiving TCP sockets directed to different proxies on a single port on frps, similar to `vhost_http_port` and `vhost_https_port`. The only supported TCP port multiplexing method available at the moment is `httpconnect` - HTTP CONNECT tunnel. When setting `tcpmux_httpconnect_port` to anything other than 0 in frps under `[common]`, frps will listen on this port for HTTP CONNECT requests. The host of the HTTP CONNECT request will be used to match the proxy in frps. Proxy hosts can be configured in frpc by configuring `custom_domain` and / or `subdomain` under `type = tcpmux` proxies, when `multiplexer = httpconnect`. For example: ```ini # frps.ini [common] bind_port = 7000 tcpmux_httpconnect_port = 1337 ``` ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 [proxy1] type = tcpmux multiplexer = httpconnect custom_domains = test1 [proxy2] type = tcpmux multiplexer = httpconnect custom_domains = test2 ``` In the above configuration - frps can be contacted on port 1337 with a HTTP CONNECT header such as: ``` CONNECT test1 HTTP/1.1\r\n\r\n ``` and the connection will be routed to `proxy1`. ### Connecting to frps via HTTP PROXY frpc can connect to frps using HTTP proxy if you set OS environment variable `HTTP_PROXY`, or if `http_proxy` is set in frpc.ini file. It only works when protocol is tcp. ```ini # frpc.ini [common] server_addr = x.x.x.x server_port = 7000 http_proxy = http://user:pwd@192.168.1.128:8080 ``` ### Range ports mapping Proxy with names that start with `range:` will support mapping range ports. ```ini # frpc.ini [range:test_tcp] type = tcp local_ip = 127.0.0.1 local_port = 6000-6006,6007 remote_port = 6000-6006,6007 ``` frpc will generate 8 proxies like `test_tcp_0`, `test_tcp_1`, ..., `test_tcp_7`. ### Client Plugins frpc only forwards requests to local TCP or UDP ports by default. Plugins are used for providing rich features. There are built-in plugins such as `unix_domain_socket`, `http_proxy`, `socks5`, `static_file` and you can see [example usage](#example-usage). Specify which plugin to use with the `plugin` parameter. Configuration parameters of plugin should be started with `plugin_`. `local_ip` and `local_port` are not used for plugin. Using plugin **http_proxy**: ```ini # frpc.ini [http_proxy] type = tcp remote_port = 6000 plugin = http_proxy plugin_http_user = abc plugin_http_passwd = abc ``` `plugin_http_user` and `plugin_http_passwd` are configuration parameters used in `http_proxy` plugin. ### Server Manage Plugins Read the [document](/doc/server_plugin.md). Find more plugins in [gofrp/plugin](https://github.com/gofrp/plugin). ## Development Plan * Log HTTP request information in frps. ## Contributing Interested in getting involved? We would like to help you! * Take a look at our [issues list](https://github.com/fatedier/frp/issues) and consider sending a Pull Request to **dev branch**. * If you want to add a new feature, please create an issue first to describe the new feature, as well as the implementation approach. Once a proposal is accepted, create an implementation of the new features and submit it as a pull request. * Sorry for my poor English. Improvements for this document are welcome, even some typo fixes. * If you have great ideas, send an email to fatedier@gmail.com. **Note: We prefer you to give your advise in [issues](https://github.com/fatedier/frp/issues), so others with a same question can search it quickly and we don't need to answer them repeatedly.** ## Donation If frp helps you a lot, you can support us by: frp QQ group: 606194980 ### AliPay ![donation-alipay](/doc/pic/donate-alipay.png) ### Wechat Pay ![donation-wechatpay](/doc/pic/donate-wechatpay.png) ### Paypal Donate money by [paypal](https://www.paypal.me/fatedier) to my account **fatedier@gmail.com**.