Fix ARIN -> RIPE referrals in whois(1)

[mail_fbsd2.e4m.org]

Summary

For some whois queries (e.g. whois 137.31.32.184) the referral from ARIN to RIPE does not work.
This is my attempt to fix it. Instead of "ResourceLink:" one could also use "ReferralServer:".

[michaelo]

@pouria Is this something you can review? I am totally unknowledgeable here.

[pouria]

We should migrate to rfc9083 sooner or later...
Also please rebase it to main. I can't test it.

usr.bin/whois/whois.c

106

Use ReferralServer instead, unfortunately, it's not formal but the only thing that is referenced in a RFC.
See: RFC7485 Sec 4.3

Also, it's not specific to RIPE, it used by ARIN in general.
For example:

whois -a 1.1.1.1

[pouria]

usr.bin/whois/whois.c

104–107

I just tested it, and I think we should remove all ReferralServer lines and add a single ReferralServer: without any prefix. This should do the job.

For testing:
whois -aR 5.159.192.0

Alternatively, we could simply add another WHOIS_REFERRAL("ReferralServer:"), below it to prioritize the ReferralServers with a specified protocol. However, that would be a bit ugly.

[mail_fbsd2.e4m.org]

usr.bin/whois/whois.c

104–107

When only using one "ReferralServer:" this breaks stuff when, for example, "rwhois://" is prepended, like "whois 146.115.106.228".
I don't know if chopping off everything before :// would be OK in all cases. So I think the "ugly" version might be ugly but should work.

[pouria]

usr.bin/whois/whois.c

104–107

Go head, I'm ok with the other one too.

[mail_fbsd2.e4m.org]

Use "ReferralServer" instead of "ResourceLink"

[pouria]

LGTM