rabbit_peer_discovery: Pass inetrc config file to temporary hidden node

[dumbbell]

Why

As shown in #10728, in an IPv6-only environment, kernel name resolution must be configured through an inetrc file.

The temporary hidden node must be configured exactly like the main node (and all nodes in the cluster in fact) to allow communication. Thus we must pass the same inetrc file to that temporary hidden node. This wasn’t the case before this patch.

How

We query the main node’s kernel to see if there is any inetrc file set and we use the same on the temporary hidden node’s command line.

While here, extract the handling of the proto_dist module from the TLS code. This parameter may be used outside of TLS like this IPv6-only environment.

Fixes #10728.

[lukebakken]

You know, I haven't tested any of this "hidden node" stuff on Windows. I'll make time to do that with this patch and will test TLS-enabled distribution as well.

[dumbbell]

You know, I haven't tested any of this "hidden node" stuff on Windows. I'll make time to do that with this patch and will test TLS-enabled distribution as well.

That would be great! Thank you very much :-)

[lukebakken]

I'm just making a note here that this PR is a follow-up to #10194

[lukebakken]

OK, I built a Windows zip with this PR, and the inetrc argument is passed to the peer node at startup:

Peer discovery: peer node arguments: #{args =>
                                           ["-ssl_dist_optfile",
                                            "C:/Users/lbakken/development/lukebakken/windows-rabbitmq-cluster/rmq1 Евгений/inter_node_tls.config",
                                            "-kernel","inetrc",
                                            "\"C:/Users/lbakken/development/lukebakken/windows-rabbitmq-cluster/erl_inetrc\"",
                                            "-proto_dist","inet_tls","-pa",
                                            "c:/Users/lbakken/scoop/apps/erlang/26.2.3/lib/ssl-11.1.2/ebin",
                                            "-boot","start_sasl","-hidden"],
                                       name => "rmq1-4-22800"}

Cluster formation worked correctly, as well. Here is the erl_inetrc file I used:

https://github.com/lukebakken/windows-rabbitmq-cluster/blob/tls-disterl-utf8/erl_inetrc

[michaelklishin]

The reporter suggests that a package built off of this branch does work as expected (the way 3.12.x did in the same environment) #10728 (comment).

[michaelklishin]

The forced push was a rebase.

[dumbbell]

The patch was not ready (hence the draft status) and should not have been merged. I reverted it.