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insert new diagram, flesh out API, add a few questions..

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John-Mark Gurney 2 years ago
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      lab.doc.md.html

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@@ -25,7 +25,7 @@ images on various boards remotely.
- Long term goals:
- Emulated microSD cards

### Architecture
### Physical Architecture

The following diagrams the connections between the components. It is expected
that the connections for the RockPro64 is followed similarly for other embedded
@@ -42,29 +42,101 @@ The PoE part of the switch will be used for power control. PoE splitters (~$10)
are readily available and inexpensive, and the cost per port is realatively
inexpensive considering that power consumption will also be provided.

***********************************************************************************
* *
* +--------------+ +-----------------+ *
* | Host machine +-----------------------------------------+ | Internet | *
* +-+------------+ | +-+---------------+ *
* | | | *
* | | | *
* | | | *
* +-+------------+ +----------------+ | +-+---------------+ *
* | USB Hub +-----+ Serial adapter | +--+ PoE/VLAN Switch | *
* +--------------+ +-+--------------+ +-+---------------+ *
* | | *
* | | *
* | | *
* +-+--------------+ Network +-+---------------+ *
* | RockPro64 +---------------------+ PoE Splitter | *
* +-+--------------+ +-+---------------+ *
* | | *
* | | *
* | | *
* Power | *
* -----------------------------------------+ *
* *
***********************************************************************************
**************************************************************************
* *
* +--------------+ +-----------------+ *
* | Host machine +-------------------------+ | Internet | *
* +-+------------+ | +-+---------------+ *
* | | | *
* | | | *
* | | | *
* +-+------------+ +----------------+ | +-+---------------+ *
* | USB Hub +-----+ Serial adapter | +---------+ PoE/VLAN Switch | *
* +--------------+ +-+--------------+ +-+---------------+ *
* | | *
* | | *
* | | *
* +-+--------------+ Network +-+---------------+ *
* | RockPro64 +------------+ PoE Splitter | *
* +-+--------------+ +-+---------------+ *
* | Power | *
* +-----------------------------+ *
* *
**************************************************************************

### Logical Architecture

No user will be able to log into the host machine directly. The only user
interface exposed on the host will be via an RPC interface, e.g.
`echo function xxx | ssh labhost labcli`, or via a socket from within
the jail.

Workflow
--------

# Functions

The functions that take a device handle can be executed from within the device jail
and the device handle of that device jail will be used. An error will be raised if
a device handle is provided and it does not match the current jail.

These are the functions a user can execute:
1. List device classes (onlyavailable=false)
List the device classes that are known about. If onlyavailable is true, than only
ones that are currently available for claiming are returned.
2. Device status (claimed=false)
List all the device statuses currently. This includes that status, claimed or
unclaimed. If the device is claimed, it includes the user to claimed it. If claimed
is true, only list devices that are currently claimed by you. The default is to list
all devices.
3. Claim device (device class, power=false)
A user can use this to lock a device. This will return a device handle with the
device information, such as the device's jail's IP address, or an error. Once they
have obtained a device, it will not be allocated to another user till they have release
this device (or in the future a timeout has been hit). The user's ssh keys will be
automatically populated in that jail. By default, the device will be in the power off
state. When a default configuration is provided for the board, it can be automatically
powered on to make it easier to integrate w/ systems like CI.
4. Reinit device (device handle)
This will remove the current jail, and recreate it as if it was claimed for the first
time. This can be done so you can get the jail in a clean state w/o risk losing the
lock by freeing it and then reclaiming it. If you have not claimed the device, an
error will be returned. If the reinit fails, an error will be returned, but the claim
will be maintained.
5. Release device (device handle)
Release a claim on the device handle returned by claim device. This will make it
available to users again. All data in the jail will be deleted. It will return an
error if you do have have a claim on the device.
6. Power off (device handle)
Turn off the power to the device.
7. Power on (device handle)
Turn on the power to the device.

# Services provided in the device jail

Once logged in, the jail will have the following services:
1. ssh
Incoming ssh must be provided for the user to login.
2. One interface for internet
nat setup so that all traffic appears from jail's IP.
3. One interface for device
4. Serial port for console access
5. dhcpd for device w/ tftp already configured
6. inetd w/ tftpd setup
7. nfsd setup w/ exports configured
8. power control for device

As the user will have root access, all of these can be modified after.

Questions
=========

Should the host key for the device be kept between invocations.
Pros: Users don't have to munch the known_hosts every time.
Cons: Malicious user could impersonate the jail as they can copy out the key.

IPv6 support?
I have enough that each device can get a /64, but this remove privacy in
that the network will tell which device was active at the time

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