Bug #12494: win32/resolv.rb may add outdated nameservers

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN

[valentyn (Valentijn Sessink)]

When using Ruby on Windows, the Resolv class may use outdated nameservers without notice.

This is due to the fact that win32/resolv.rb walks the Registry and adds nameservers from all interfaces, including the ones that have a link down status. Code:

reg.open('Interfaces') do |reg|
reg.each_key do |iface,|
reg.open(iface) do |regif|
begin
[ 'NameServer', 'DhcpNameServer' ].each do |key|
ns = regif.read_s(key)
unless ns.empty?
nameserver.concat(ns.split(/[,\s]\s*/))

When interface 1 has 8.8.8.8 for DhcpNameServer but the interface is down, and interface 2 has 10.something for nameserver, then still 8.8.8.8 will be queried by Resolv.

[nobu (Nobuyoshi Nakada)]

• Has duplicate Bug #12604: Win32::Resolv.get_resolv_info returns unavailable DNS servers added

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed