Vlan server protocol and library *draft*
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telnet-based protocol. Client commands are text, server responses are numbers followed by
an explicative text (like irc). Common messages number should probalbly be grouped.

Two different notions: session and connexion
    session has a long timeout (several hours), and should not use server-side resources
    connexion has a short timeout (a few minutes) and can use server-side resources (thread)

A vlan resource (switch+port) is identified by a unique id. Changes can obviously be done
with this id, but also, for administrative facilities, with other identifiers.

Client commands:

LOGIN <login> [<application>]
    -> open connexion, required before any communication with server. Login and password should
    correspond to groups (admin, users...) rather than individual ids. Application is for stats.
    answers:    100: ok
                101: rejected, invalid login
                102: rejected, too many connexions
                103: rejected, forbidden source 
                104: rejected, already logged in
                109: rejected, other reason    
                password required

PASS <password>

LOGOUT -> close connexion
    answer:     200: ok, session closed

OPEN <client-session-id>
    -> open session. required before any write operations
    answers:    300: <server-session-id>
                301: rejected, not authorized
                302: rejected, too many sessions
                399: rejected, other reason

RECOVER <client-session-id> <server-session-id>
    -> recover session. Both id are required for security.
    answer:     400: ok
                401: rejected, not authorized (invalid login or something else)
                402: rejected, invalid ids
                403: rejected, session already active on another connexion
                499: rejected, other reason

CLOSE [<server-session-id>]
    -> close session. Session must be active for normal users.
    answer:     500: ok, session closed
                501: error, not loged in
                502: error: active session
                503: error: not authorized

STATUS ME
STATUS MAC <mac>
STATUS IP <ip>
STATUS ID <rsc-id>
    give informations about something
    answer:     600: mark beginning of status info
                601: mark end of status info
                602: error, not authorized
                603: error, unknown
                604: error, request failed             
                610: <rsc-id>
                611: <vlan>
                612: <ip>
                613: <mac>
                614: <switch-ip>
                615: <switch-port>
                616: <number of interfaces dependant of this resource>
                617: <lock info>
                699: error, other reason

LOCK ME
LOCK MAC <mac>
LOCK IP <ip>
LOCK ID <rsc-id>
    lock a resource id (session required)
    answers:
     
UNLOCK ME
UNLOCK MAC <mac>
UNLOCK IP <ip>
UNLOCK ID <id>
    unlock a resource id (session required)
    answers:

CHANGE ME <vlan>
CHANGE MAC <mac> <vlan>
CHANGE IP <ip> <vlan>
CHANGE ID <id> <vlan>
    change a vlan (session required)

Administrative commands:

HELP
    print list of commands
    answer:     

KICK

RESET

LIST IDS
LIST MACS
LIST IPS
LIST SESSIONS
LIST CONNECTIONS
LIST LOGINS

QUIT

CONFIRM