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@startuml
title DHCPv4 Assign Lease (Kea 1.8.0)
agent "Check Subnet" as subnet
note left : entry point
agent "Get server id" as server_id
agent "Get hint" as hint
agent "Get hardware address and client id" as ident
rectangle "INIT-REBOOT state" as init_reboot {
agent "Get existing lease by client id" as by_client_id
agent "Get existing lease by hardware address" as by_hw_addr
agent "Get authoritative" as authoritative
}
agent "Process hostname" as hostname
agent "Request lease" as allocate
rectangle "Lease allocated" as allocated {
agent "update DDNS" as ddns
agent "Send ACK" as ack
}
agent "No lease allocated" as failed
note right : exit point
agent "Send NAK" as nak
note right : exit point
agent "No response" as no_response
note right : exit point
subnet --> server_id
subnet ---> nak : no subnet
server_id --> hint
hint --> ident : use requested address option
hint --> ident : use client address
hint --> ident : no hint
ident --> init_reboot : requested address and no server id
ident ---> hostname
init_reboot --> by_client_id : has a client id
init_reboot --> by_hw_addr : no client id
by_client_id ---> authoritative : found
by_client_id --> by_hw_addr : not found
by_hw_addr --> authoritative
authoritative ---> no_response : not authoritative and no owned lease
authoritative --> nak : owned lease with hint mismatch
authoritative --> nak : authoritative and no owned lease
authoritative --> hostname : other cases
hostname --> allocate
allocate --> allocated : lease allocated
allocated --> ddns
ddns --> ack
allocate --> failed : no lease allocated
failed --> nak
@enduml
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