Bug #14369: Win32::Resolv.get_hosts_path may return nil, causing Resolv to fail

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: trunk
• Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN

[docwhat (Christian Höltje)]

Win32::Resolv.get_hosts_path() may return nil.

The Resolv class uses that to get the hosts filename which is used as the default when initializing Hosts as @filename.

However, File.open(@filename, 'rb') is always called, even if @filename is nil.

This causes the error: TypeError: no implicit conversion of nil into String

[docwhat (Christian Höltje)]

Added GitHub PR #1791

[nobu (Nobuyoshi Nakada)]

What configuration causes it?
No TCP/IP stack?

[nobu (Nobuyoshi Nakada)]

• Status changed from Open to Closed

Applied in changeset trunk|r61898.

---

resolv.rb: NUL hosts

• lib/resolv.rb (Resolv::Hosts::DefaultFileName): fallback to NUL
  device when Win32::Resolv.get_hosts_path() returned nil, to get
  rid of TypeError in lazy_initialize.
  [ruby-core:84907] [Bug #14369] [Fix GH-1791]