[WIP] Strip a trailing . when present in name - #4348

[cscherban]

This is a very poor attempt at addressing the issue mentioned here: https://github.com/confluentinc/librdkafka/issues/4348, which is caused by https://github.com/openssl/openssl/issues/11560#issuecomment-1619143823

If this is the wrong place to be attempting to address the issue, I would love guidance on how to properly tackle the problem. I don't use librdkafka directly, but rely on a ruby wrapping library. (karafka).

What I'm attempting here is to transform my.kafka.domain.com.:9093 -> my.kafka.domain.com:9093 by splitting on ":" and replacing trailing "." with "\0"

[cla-assistant[bot]]

All committers have signed the CLA.

[Quuxplusone]

No comment on the desirability of this patch (versus waiting for OpenSSL to fix it, or discovering that it's not really a bug after all) — but unless I'm mistaken, the :9093 part has already been stripped by line 452, and any : characters that remain are part of an IPv6 address. So probably all you want here is:

         /* Remove ":9092" port suffix from nodename */
         if ((t = strrchr(name, ':')))
                 *t = '\0';
+
+        /* Remove "." trailing dot suffix from nodename */
+        if ((t = strrchr(name, '.')) && t[1] == '\0')
+                *t = '\0';