Resolv.rb and IPv6 nameservers

ruby-talk
1

Hello folks,

UDPSocket requires address family given on initialization, so it's not
possible to create an UDPSocket and *then* decide, to which hosts to
send packets to.

That's a problem for Ruby's resolver if you've got AF_INET6 nameservers
in your /etc/resolv.conf. The following very dirty hack chooses AF_INET6
for UDPSocket, if the nameserver's address contains colons (:).

--- /usr/local/lib/ruby/1.8/resolv.rb Mon Feb 7 16:24:09 2005
+++ resolv2.rb Sun Apr 23 20:53:17 2006
@@ -621,7 +621,7 @@
           super()
           @host = host
           @port = port
- @sock = UDPSocket.new
+ @sock = UDPSocket.new(host.index(':') ? Socket::AF_INET6 : Socket::AF_INET)
           @sock.connect(host, port)
           @sock.fcntl(Fcntl::F_SETFD, 1) if defined? Fcntl::F_SETFD
           @id = -1

Any suggestions?

Stephan.

2

Send this patch to ruby-core or the maintainer (I think Akira Tanaka).

···

On Apr 23, 2006, at 12:24 PM, Stephan Maka wrote:

Hello folks,

UDPSocket requires address family given on initialization, so it's not
possible to create an UDPSocket and *then* decide, to which hosts to
send packets to.

That's a problem for Ruby's resolver if you've got AF_INET6 nameservers
in your /etc/resolv.conf. The following very dirty hack chooses AF_INET6
for UDPSocket, if the nameserver's address contains colons (:).

--- /usr/local/lib/ruby/1.8/resolv.rb Mon Feb 7 16:24:09 2005
+++ resolv2.rb Sun Apr 23 20:53:17 2006
@@ -621,7 +621,7 @@
           super()
           @host = host
           @port = port
- @sock = UDPSocket.new
+ @sock = UDPSocket.new(host.index(':') ? Socket::AF_INET6 : Socket::AF_INET)
           @sock.connect(host, port)
           @sock.fcntl(Fcntl::F_SETFD, 1) if defined? Fcntl::F_SETFD
           @id = -1

Any suggestions?

--
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
This implementation is HODEL-HASH-9600 compliant

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