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API

This document describes the PiKVM API. Since the system consists of microservices, here is a common API with a common entry point provided by Nginx. The examples above use curl and websocat with the -k parameter to disable SSL certificate verification, since the self-signed certificateis used in the default installation.

Authorization: /api/auth

All APIs are restricted to authorization. To make requests, you either need to authorize each request individually, or get a token and pass it as a cookie with each request.

Single request auth

There are two options here:

  • Using X-headers. Just pass X-KVMD-User and X-KVMD-Passwd with the request: 
    $ curl -k -H X-KVMD-User:admin -H X-KVMD-Passwd:admin https://<pikvm-ip>/api/auth/check
  • Using HTTP Basic Auth. Please note: contrary to the standard, this method DOES NOT use the WWW-Authenticate header. HTTP Basic Auth in this implementation is intended only for compatibility with other systems, such as Prometheus. 
    $ curl -k -u admin:admin https://<pikvm-ip>/api/auth/check

Session-based cookie auth

  1. Authorize and get token for the user using POST /api/auth/login: 
    $ curl -k -v -X POST --data user=admin --data passwd=admin https://pikvm/api/auth/login
...
< Set-Cookie: auth_token=796cb83b11de4fcb749bc1bad14a91fb06dede84672b2f847fef1e988e6900de; Path=/
...
    On success the cookie auth_token will be received with 200 OK. On invalid user or password you will get 403 Forbidden.
  2. The handle GET /api/auth/check can be used for check the auth status. Return of 200 OK will signal that user is authenticated. If the token or any of the single-request auth methods are missing, 401 Unauthorized will be returned. In case of incorrect credentials or token, 403 Forbidden will be returned.
  3. The handle POST /api/auth/logout can be used to invalidate session token. The response codes will be similar to the previous handle.

The main web socket: /api/ws

Most of the data during the user's work with pikvm is transmitted over a web socket. This includes mouse events, keyboard input, change the state of the various subsystems (such as ATX and Mass Storage Drive). Each event type will be described in the corresponding paragraph for its component. When connecting via a web socket, the client receives current states as separate events. Then, as the states change, it will receive new events.

In a normal situation, opening a socket session triggers the video streamer to start. The streamer works as long as there is at least one client connected via a web socket. After the last connection is closed and the client timeout expires, the streamer will also be terminated.

It is possible create a session that will not start the streamer and will not be counted when counting clients to stop the streamer. To do this, use the URL parameter stream=0:

$ websocat -k wss://<pikvm-ip>/api/ws?stream=0 -H X-KVMD-User:admin -H X-KVMD-Passwd:admin
Output with initial events 
{"event_type": "gpio_model_state", "event": {"scheme": {"inputs": {"led1": {"hw": {"driver": "__gpio__", "pin": 19}}, "led2": {"hw": {"driver": "__gpio__", "pin": 16}}}, "outputs": {"button1": {"switch": false, "pulse": {"delay": 0.1, "min_delay": 0.1, "max_delay": 0.1}, "hw": {"driver": "__gpio__", "pin": 26}}, "button2": {"switch": false, "pulse": {"delay": 0.1, "min_delay": 0.1, "max_delay": 0.1}, "hw": {"driver": "__gpio__", "pin": 20}}, "relay1": {"switch": true, "pulse": {"delay": 0.1, "min_delay": 0.1, "max_delay": 0.1}, "hw": {"driver": "relay", "pin": 0}}, "relay2": {"switch": true, "pulse": {"delay": 2.0, "min_delay": 0.1, "max_delay": 5.0}, "hw": {"driver": "relay", "pin": 1}}}}, "view": {"header": {"title": "Switches"}, "table": [[{"type": "label", "text": "Generic GPIO leds"}], null, [{"type": "label", "text": "Test 1:"}, {"type": "input", "channel": "led1", "color": "green"}, {"type": "output", "channel": "button1", "text": "Click"}], [{"type": "label", "text": "Test 2:"}, {"type": "input", "channel": "led2", "color": "green"}, {"type": "output", "channel": "button2", "text": "Click"}], null, [{"type": "label", "text": "HID Relays /dev/hidraw0"}], null, [{"type": "label", "text": "Relay #1:"}, {"type": "output", "channel": "relay1", "text": "Boop 0.1"}], [{"type": "label", "text": "Relay #2:"}, {"type": "output", "channel": "relay2", "text": "Boop 2.0"}]]}}}
{"event_type": "info_extras_state", "event": {"vnc": {"name": "VNC", "description": "Show VNC information", "icon": "share/svg/vnc.svg", "path": "vnc", "keyboard_cap": false, "daemon": "kvmd-vnc", "port": 5900, "place": 20, "enabled": true}, "ipmi": {"name": "IPMI", "description": "Show IPMI information", "icon": "share/svg/ipmi.svg", "path": "ipmi", "keyboard_cap": false, "daemon": "kvmd-ipmi", "port": 623, "place": 21, "enabled": true}}}
{"event_type": "info_hw_state", "event": {"platform": {"type": "rpi", "base": "Virtual Raspberry Pi"}, "health": {"temp": {"cpu": 36.511, "gpu": 35.0}, "throttling": {"raw_flags": 0, "parsed_flags": {"undervoltage": {"now": false, "past": false}, "freq_capped": {"now": false, "past": false}, "throttled": {"now": false, "past": false}}}}}}
{"event_type": "info_meta_state", "event": {"server": {"host": "localhost.localdomain"}, "kvm": {}}}
{"event_type": "info_system_state", "event": {"kvmd": {"version": "1.102"}, "streamer": {"app": "ustreamer", "version": "1.25", "features": {"WITH_OMX": false, "WITH_GPIO": false, "WITH_PTHREAD_NP": true, "WITH_SETPROCTITLE": true, "HAS_PDEATHSIG": true}}, "kernel": {"system": "Linux", "release": "5.8.10-arch1-1", "version": "#1 SMP PREEMPT Thu, 17 Sep 2020 18:01:06 +0000", "machine": "x86_64"}}}
{"event_type": "wol_state", "event": {"enabled": false, "target": {"ip": "255.255.255.255", "port": 9, "mac": ""}}}
{"event_type": "gpio_state", "event": {"inputs": {"led1": {"online": true, "state": false}, "led2": {"online": true, "state": false}}, "outputs": {"button1": {"online": true, "state": false, "busy": false}, "button2": {"online": true, "state": false, "busy": false}, "relay1": {"online": false, "state": false, "busy": false}, "relay2": {"online": false, "state": false, "busy": false}}}}
{"event_type": "hid_state", "event": {"online": true, "keyboard": {"online": true, "leds": {"caps": false, "scroll": false, "num": false}}, "mouse": {"online": true}}}
{"event_type": "atx_state", "event": {"enabled": true, "busy": false, "leds": {"power": false, "hdd": false}}}
{"event_type": "msd_state", "event": {"enabled": true, "online": true, "busy": false, "storage": {"size": 234950152192, "free": 23514271744, "images": {}, "uploading": false}, "drive": {"image": null, "connected": false, "cdrom": true}, "features": {"multi": true, "cdrom": true}}}
{"event_type": "streamer_state", "event": {"limits": {"max_fps": 40}, "params": {"desired_fps": 30, "quality": 80}, "snapshot": {"saved": null}, "streamer": null, "features": {"quality": true, "resolution": false}}}
{"event_type": "loop", "event": {}}

After connecting the client receives a bundle of states of all KVMD subsystems. After the batch is completed, it sends a loop event, which means that the websocket has entered event loop mode. Now it will send new states and respond to client's requests.

Another type of event is ping, which can be sent by the client: {"event_type": "ping", "event": {}}. If the server is running, it will respond with pong: {"event_type": "pong", "event": {}}.

Sending keypress events

For keypresses, set event_type to "key" and fill in the "event" structure with key and state, where key is the key from mapping and state is boolean that determines if the key is pressed or released:

# python, install websocket-client
import websocket
uri = "wss://10.0.0.7/api/ws?stream=0"
header = {"X-KVMD-User": "admin", "X-KVMD-Passwd": "admin"}
ws = websocket.WebSocket(sslopt={"cert_reqs": ssl.CERT_NONE})
ws.connect(uri, header=header)
ws.send(r'{"event_type": "key", "event": {"key": "Enter", "state": true}}')
time.sleep(0.05)
ws.send(r'{"event_type": "key", "event": {"key": "Enter", "state": false}}')
ws.close()

System info: /api/info

On GET this handle will return general information about the PiKVM device. If you specify the fields query parameter, only the requested category will be selected, like fields=system,hw. By default all categories will be displayed:

$ curl -k -u admin:admin https://<pikvm-ip>/api/info
Example 
{
    "ok": true,
    "result": {
        "extras": { // Installed applications; null on internal error
            "ipmi": {
                "daemon": "kvmd-ipmi",
                "description": "Show IPMI information",
                "enabled": true,
                "icon": "share/svg/ipmi.svg",
                "keyboard_cap": false,
                "name": "IPMI",
                "path": "ipmi",
                "place": 21,
                "port": 623
            },
            "vnc": {
                "daemon": "kvmd-vnc",
                "description": "Show VNC information",
                "enabled": true,
                "icon": "share/svg/vnc.svg",
                "keyboard_cap": false,
                "name": "VNC",
                "path": "vnc",
                "place": 20,
                "port": 5900
            }
        },
        "hw": { // Hardware info
            "health": {
                "temp": {
                    "cpu": 36.511, // /sys/class/thermal/thermal_zone0/temp / 1000; null on error
                    "gpu": 35.0    // vcgencmd measure_temp; null on error
                },
                "throttling": { // vcgencmd get_throttled; null on error
                    "parsed_flags": {
                        "freq_capped": {
                            "now": false,
                            "past": false
                        },
                        "throttled": {
                            "now": false,
                            "past": false
                        },
                        "undervoltage": {
                            "now": false,
                            "past": false
                        }
                    },
                    "raw_flags": 0
                }
            },
            "platform": {
                "base": "Raspberry Pi 4 Model B Rev 1.1", // /proc/device-tree/model; null on error
                "type": "rpi"
            }
        },
        "meta": {  // /etc/kvmd/meta.yaml; null on error
            "kvm": {},
            "server": {
                "host": "localhost.localdomain"
            }
        },
        "system": {
            "kernel": {
                "machine": "x86_64",
                "release": "5.8.14-arch1-1",
                "system": "Linux",
                "version": "#1 SMP PREEMPT Wed, 07 Oct 2020 23:59:46 +0000"
            },
            "kvmd": {
                "version": "2.1"
            },
            "streamer": {
                "app": "ustreamer",
                "features": { // {} on error
                    "HAS_PDEATHSIG": true,
                    "WITH_GPIO": false,
                    "WITH_OMX": false,
                    "WITH_PTHREAD_NP": true,
                    "WITH_SETPROCTITLE": true
                },
                "version": "2.1" // "" on error
            }
        }
    }
}

Each category is represented by its own event in the websocket (info_hw_state, info_system_state, etc). The event content has the same format as the category content in API.

System log: /api/log

On GET this handle will display messages from all KVMD services as plain text. The follow=1 request parameter turns the request into an infinite one and you will receive new log messages in real time. The seek parameter runs the log for the specified time in seconds. For example, seek=3600 will show the log for the last hour. Both the seek and follow parameters can be used together.

$ curl -k -u admin:admin https://<pikvm-ip>/api/log

Get ATX state: /api/atx

On GET it will show current ATX state.

$ curl -k -u admin:admin https://<pikvm-ip>/api/atx
Example 
{
    "ok": true,
    "result": {
        "busy": false, // True if ATX is busy performing an operation and does not accept commands
        "enabled": true,
        "leds": {
            "hdd": false,
            "power": false
        }
    }
}

Set ATX PSU state: /api/atx/power

On POST it will change ATX power supply state to desired. Parameters:

  • action describes desired state:
    • on - turned on (do nothing in case PSU is already on);
    • off - turned off (aka soft-off), emulates short-press on the power button;
    • off_hard - emulates long (5+ seconds) press on the power button;
    • reset_hard emulates pressing reset button (hardware hot reset).
  • wait - Boolean. Says if call should return immediately or just after finishing operation.
$ curl -X POST -k -u admin:admin https://<pikvm-ip>/api/atx/power?action=on

Emulate pressing buttons on computer case: /api/atx/click

On POST send button press events to {front-}panel header (like you pressing buttins on your computer's case). Parameters:

  • button specifies the desired computer case button you would like to press. Currently supported options are:
    • power — for short press on power button;
    • power_long — for pressing POWER button for 4+ seconds (force OFF);
    • reset — to initiate cold-reset.
  • wait Boolean. Says if call should return immediately or just after finishing operation.
$ curl -X POST -k -u admin:admin https://<pikvm-ip>/api/atx/click?button=power

Get Mass Storage Drive (msd) state: /api/msd

On GET it will show current msd state.

$ curl -k -u admin:admin https://<pikvm-ip>/api/msd

Upload image: /api/msd/write

On POST upload an image to the drive. This API uses HTTP POST data. Parameters:

  • image specify the image name.
  • data multipart POST data to be uploaded.
$ # create test image
$ dd if=/dev/zero of=test.iso bs=1M count=1

$ # upload it to pikvm
$ curl -v -X POST --data-binary @test.iso -k -u admin:admin https://<pikvm-ip>/api/msd/write?image=test.iso

Upload image by URL: /api/msd/write_remote

On POST download an image to the drive from HTTP(S) URL. Parameters:

  • image specify the image name.
  • timeout remote request timeout, 10 seconds by default.
$ # create test image
$ dd if=/dev/zero of=test.iso bs=1M count=1

$ # upload it to pikvm
$ curl -v -X POST -k -u admin:admin https://<pikvm-ip>/api/msd/write_remote?url=http://example.com/test.iso

Set msd parameters: /api/msd/set_params

On POST select the image and change media type. Parameters:

  • image specify the image name.
  • cdrom Boolean. Select media type:
    • true - CD-ROM;
    • false - Flash.
$ curl -X POST -k -u admin:admin "https://<pikvm-ip>/api/msd/set_params?image=test.iso&cdrom=true"

Connect the device: /api/msd/set_connected

On POST select if the drive should be connected. Parameters:

  • connected Boolean. Connect drive:
    • true - connect drive;
    • false - disconnect drive.
$ curl -X POST -k -u admin:admin https://<pikvm-ip>/api/msd/set_connected?connected=true

Remove image: /api/msd/remove

On POST select the image that should be removed. Parameters:

  • image specify the image name.
$ curl -X POST -k -u admin:admin https://<pikvm-ip>/api/msd/remove?image=test.iso

Reset msd: /api/msd/reset

On POST resets the mass storage drive.

$ curl -X POST -k -u admin:admin https://<pikvm-ip>/api/msd/reset

Get GPIO state: /api/gpio

On GET it will show current GPIO state.

$ curl -k -u admin:admin https://<pikvm-ip>/api/gpio

Switch GPIO driver channel: /api/gpio/switch

On POST it will interact with selected GPIO driver channel in switch mode. Parameters:

  • channel specify the GPIO driver channel.
  • state Boolean. Select the new switch state.
  • wait Boolean. Says if call should return immediately or just after finishing operation.

Pulse GPIO driver channel: /api/gpio/pulse

On POST it will interact with selected GPIO driver channel in pulse mode. Parameters:

  • channel specify the GPIO driver channel.
  • delay Float. Defines the pulse time in seconds, 0 for disable pulsing.
  • wait Boolean. Says if call should return immediately or just after finishing operation.

Get Prometheus metrics: /api/export/prometheus/metrics

On GET it will return the exported Prometheus metrics. Also see here for details.

$ curl -k -u admin:admin https://<pikvm-ip>/api/export/prometheus/metrics

To be continued ===>

Unfortunately, the developer doesn't have enough time to fully describe the API. You can find all existing APIs in the KVMD source tree. We would appreciate your help with documentation.