Issue #16439 has been reported by jmr (Jan-Martin R=E4mer).

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Bug #16439: Resolv::DNS: timeouts if multiple IPv6 name servers are given a=
nd address contains leading zero
https://bugs.ruby-lang.org/issues/16439

* Author: jmr (Jan-Martin R=E4mer)
* Status: Open
* Priority: Normal
* Assignee: =

* Target version: =

* ruby -v: =

* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Hi,

Resolv::DNS does not return any results under those conditions:
- there are at least two name servers (in /etc/resolv.conf).
- The name servers have IPv6 addresses containing leading zeros.

Example resolv.conf:
nameserver 2001:0db8::0001:1
nameserver 2001:0db8::0002:1

This is caused by a mismatch in representation of the address: Requester::s=
ender_for compares the address of the answering server (e.g. 2001:0db8::1:1=
) with the address the request was sent to (e.g. 2001:0db8::0001:1).
This can be fixed by stripping leading zeros from the sender's address, as =
done in the attached patch.

Best regards,
Jan-Martin


---Files--------------------------------
resolv.rb.patch (397 Bytes)


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