[Kea-users] API call 'reservation-del' removes all v6 reservations.

[Darren Ankney]

Hi Andy,

I was not able to reproduce this in 2.4.0.  What version were you using?

I tested using this simple configuration:

{
  "Dhcp6": {
    "control-socket": {
      "socket-type": "unix",
      "socket-name": "/tmp/socket6"
    },
    "interfaces-config": {
      "interfaces": [
        "ens256"
      ]
    },
    "hosts-database": {
      "type": "mysql",
      "name": "kea",
      "user": "kea",
      "password": "kea",
    },
    "hooks-libraries": [
      {
        "library": "/usr/local/kea/2.4.0/lib/kea/hooks/libdhcp_host_cmds.so"
      }
    ],
    "subnet6": [
      {
        "id": 1,
        "subnet": "2001:db8::/64",
        "pools": [
          {
            "pool": "2001:db8::aaaa-2001:db8::ffff"
          }
        ]
      }
    ]
  }
}

I added a host reservation with this command:

{
  "command": "reservation-add",
  "arguments": {
    "reservation": {
      "subnet-id": 1,
      "duid": "1a:1b:1c:1d:1e:0a",
      "ip-addresses": [ "2001:db8::101" ]
    }
  }
}

and then another

{
  "command": "reservation-add",
  "arguments": {
    "reservation": {
      "subnet-id": 1,
      "duid": "1a:1b:1c:1d:1e:0b",
      "ip-addresses": [ "2001:db8::102" ]
    }
  }
}

I then had two reservations:

{
  "arguments": {
    "hosts": [
      {
        "client-classes": [],
        "duid": "1a:1b:1c:1d:1e:0a",
        "hostname": "",
        "ip-addresses": [
          "2001:db8::101"
        ],
        "option-data": [],
        "prefixes": [],
        "subnet-id": 1
      },
      {
        "client-classes": [],
        "duid": "1a:1b:1c:1d:1e:0b",
        "hostname": "",
        "ip-addresses": [
          "2001:db8::102"
        ],
        "option-data": [],
        "prefixes": [],
        "subnet-id": 1
      }
    ]
  },
  "result": 0,
  "text": "2 IPv6 host(s) found."
}

I then deleted one of them by IP address:

{
    "command": "reservation-del",
    "arguments": {
        "subnet-id": 1,
        "ip-address": "2001:db8::101"
    }
}

and still had one reservation left:

{
  "arguments": {
    "hosts": [
      {
        "client-classes": [],
        "duid": "1a:1b:1c:1d:1e:0b",
        "hostname": "",
        "ip-addresses": [
          "2001:db8::102"
        ],
        "option-data": [],
        "prefixes": [],
        "subnet-id": 1
      }
    ]
  },
  "result": 0,
  "text": "1 IPv6 host(s) found."
}


On Mon, Mar 11, 2024 at 11:19 AM Andrew Mulheirn via Kea-users
<kea-users at lists.isc.org> wrote:
>
> Hi all,
>
>
>
> I've noticed that using reservation-del against dhcp6 removes *all* reservations, while doing the same against dhcp4 behaves as expected and removes just the reservation that was specified.   I can't see why they behave differently.
>
>
>
> I have made reservations for 2a00:e340:1102::3 and 2a00:e340:1102::4 and can see them both when I do a reservation-get-all.
>
>
>
> Then I try to delete one of them.  Here is the call I am making for v6:
>
> {
>
>     "command": "reservation-del",
>
>     "service": ["dhcp6"],
>
>     "arguments": {
>
>         "subnet-id": 1,
>
>         "ip-address": "2a00:e340:1102::3"
>
>     }
>
> }
>
>
>
>
>
> When I look at the debug, I see messages just deleting this one reservation:
>
> INFO  COMMAND_RECEIVED Received command 'reservation-del'
>
> DEBUG HOOKS_CALLOUTS_BEGIN begin all callouts for hook $reservation_del
>
> INFO  HOST_CMDS_RESERV_DEL reservation-del command called (parameters: { "ip-address": "2a00:e340:1102::3", "subnet-id": 1 })
>
> INFO  HOST_CMDS_RESERV_DEL_SUCCESS reservation-del command success (parameters: { "ip-address": "2a00:e340:1102::3", "subnet-id": 1 })
>
> DEBUG HOOKS_CALLOUT_CALLED hooks library with index 2 has called a callout on hook $reservation_del that has address 0x7ff2f67cecb0 (callout duration: 5.882 ms)
>
> DEBUG HOOKS_CALLOUTS_COMPLETE completed callouts for hook $reservation_del (total callouts duration: 5.882 ms)
>
>
>
>
>
> However, when I do another reservation-get-all, the table is now empty:
>
> [
>
>     {
>
>         "arguments": {
>
>             "hosts": []
>
>         },
>
>         "result": 3,
>
>         "text": "0 IPv6 host(s) found."
>
>     }
>
> ]
>
>
>
>
>
> As I say, v4 works fine.   Any pointers would be most welcome,
>
>
>
> Cheers,
>
> Andy
>
>
> Andrew Mulheirn
>
> Senior Network Architect
>
> M: +44 (0) 74 3654 8126
>
> E: andrew.mulheirn at vorboss.com
>
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>
>
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