prior to this change, allow_anonymous is only true | false
when set to 'false', even if the client is connected without
a username, the auth backends will be invoked.
this commit introduced a new config value `false_quick_deny`
to deny access immediately without involving auth backends
Fixes https://github.com/emqx/emqx-lua-hook/issues/118
1) If the Lua hook returns an empty list, it should replace the final
topic filter list.
2) The subscribed topics after running the 'client.subscribe' hook
should not contain topics filtered out by the hooks.
If there is no information in the `ClientInfo` map that can be used to
template a placeholder, then we should avoid letting the literal
placeholder match. Otherwise, the literal placeholder will allow
messages to be published/received unintentionally.
One can still use `{eq, <<"%c">>}` if matching the placeholder is
really desired.
Port of #7108 .
Sometimes, the `emqx_sys_mon:procinfo/1` might be called with
something that is not a port, like `[]`. Not sure on the conditions
for this to happen.
```
2022-02-18T20:05:02.671592+00:00 [error] Generic server emqx_sys_mon terminating. Reason: {badarg,[{erlang,port_info,[[]],[{error_info,#{module => erl_erts_errors}}]},{emqx_sys_mon,portinfo,1,[{file,"/emqx/apps/emqx/src/emqx_sys_mon.erl"},{line,205}]},{emqx_sys_mon,'-handle_info/2-fun-5-',2,[{file,"/emqx/apps/emqx/src/emqx_sys_mon.erl"},{line,150}]},{emqx_sys_mon,suppress,3,[{file,"/emqx/apps/emqx/src/emqx_sys_mon.erl"},{line,184}]},{gen_server,try_dispatch,4,[{file,"gen_server.erl"},{line,695}]},{gen_server,handle_msg,6,[{file,"gen_server.erl"},{line,771}]},{proc_lib,wake_up,3,[{file,"proc_lib.erl"},{line,236}]}]}. Last message: {monitor,<0.7796.0>,busy_dist_port,[]}. State: #{events => [{busy_dist_port,#Port<0.127>}],timer => #Ref<0.2758388682.1853620226.133920>}.
```
Without passing an empty argument list to `emqx_ctl:print`, formatting
instructions like `~n` are being printed literally.
```
Ignore.~nJoin the cluster successfully.~nCluster status: #{running_nodes =>
['emqx@emqx-0.int.thalesmg','emqx@emqx-1.int.thalesmg',
'emqx@emqx-2.int.thalesmg','emqx@emqx-3.int.thalesmg',
'emqx@emqx-4.int.thalesmg'],
stopped_nodes => []}
```
As described in the 5.0 specification, we should disconnect clients that
exceed the receive-maximum limit.
> If it receives more than Receive Maximum QoS 1 and QoS 2 PUBLISH packets
where it has not sent a PUBACK or PUBCOMP in response, **the Server uses a
DISCONNECT packet with Reason Code 0x9**
fix: #6447
Thales Macedo Garitezi