frp/server_plugin.md at 859a330e6cf01c1f789a527780ad73a9f21390fe

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Manage Plugin

frp manage plugin is aim to extend frp's ability without modifing self code.

It runs as a process and listen on a port to provide RPC interface. Before frps doing some operations, frps will send RPC requests to manage plugin and do operations by it's response.

RPC request

Support HTTP first.

When manage plugin accept the operation request, it can give three different responses.

Reject operation and return the reason.
Allow operation and keep original content.
Allow operation and return modified content.

Interface

HTTP path can be configured for each manage plugin in frps. Assume here is /handler.

Request

POST /handler
{
    "version": "0.1.0",
    "op": "Login",
    "content": {
        ... // Operation info
    }
}

Request Header
X-Frp-Reqid: for tracing

Response

Error if not return 200 http code.

Reject opeartion

{
    "reject": true,
    "reject_reason": "invalid user"
}

Allow operation and keep original content

{
    "reject": false,
    "unchange": true
}

Allow opeartion and modify content

{
    "unchange": "false",
    "content": {
        ... // Replaced content
    }
}

Operation

Now it supports Login and NewProxy.

Client login operation

{
    "content": {
        "version": <string>,
        "hostname": <string>,
        "os": <string>,
        "arch": <string>,
        "user": <string>,
        "timestamp": <int64>,
        "privilege_key": <string>,
        "run_id": <string>,
        "pool_count": <int>,
        "metas": map<string>string
    }
}

NewProxy

Create new proxy

{
    "content": {
        "user": {
            "user": <string>,
            "metas": map<string>string
        },
        "proxy_name": <string>,
        "proxy_type": <string>,
        "use_encryption": <bool>,
        "use_compression": <bool>,
        "group": <string>,
        "group_key": <string>,

        // tcp and udp only
        "remote_port": <int>,

        // http and https only
        "custom_domains": []<string>,
        "subdomain": <string>,
        "locations": <string>,
        "http_user": <string>,
        "http_pwd": <string>,
        "host_header_rewrite": <string>,
        "headers": map<string>string,

        "metas": map<string>string
    }
}

manage plugin configure

[common]
bind_port = 7000

[plugin.user-manager]
addr = 127.0.0.1:9000
path = /handler
ops = Login

[plugin.port-manager]
addr = 127.0.0.1:9001
path = /handler
ops = NewProxy

addr: plugin listen on. path: http request url path. ops: opeartions plugin needs handle.

meta data

Meta data will be sent to manage plugin in each RCP request.

Meta data start with meta_. It can be configured in common and each proxy.

# frpc.ini
[common]
server_addr = 127.0.0.1
server_port = 7000
user = fake
meta_token = fake
meta_version = 1.0.0

[ssh]
type = tcp
local_port = 22
remote_port = 6000
meta_id = 123

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