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Subject: Re: resolv.conf and gnupg2
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From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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Date: Thu, 11 Aug 2022 15:36:45 +0200
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Andrey Repin wrote:
> Greetings, Christian Franke!
>
> ...
>> Unfortunately the ipconfig output is always localized, so this does only
>> work OOTB with English versions of Windows. The ipconfig parsing is also broken due to two reasons:
>> - The current Cygwin versions of awk, grep and sed no longer convert CR/LF
>> -> LF on stdin, so '/FooBar$/' patterns never match.
>> - ipconfig may output scoped IPv6 addresses ("fe80::1%12") which are not matched by the awk script.
>> A draft patch is attached. It also avoids the tmp file and uses shell builtins where possible.
> Why not use netsh with `chcp 65001`?

How would netsh help?

Netsh is also localized and changing the codepage does possibly not 
change the output language. Changing the language would also require 
'.../en-US/netsh.exe.mui' file which is not necessarily installed.

If netsh is run interactively, it prints a deprecation warning for 
'interface' and other commands and recommends usage of powershell.

This works but is slow and might violate local security policy:

  powersh()
  {
    local x
    # May require '-ExecutionPolicy ...'
    if ! x=$(powershell -NoProfile -Command "$@" 2>/dev/null); then
      echo "powershell: failed" >&2
      return 1
    fi
    echo "$x" | tr -d '\r'
  }

  search=$(powersh \
    'Get-DnsClientGlobalSetting `
     | ForEach-Object SuffixSearchList')

  nameservers=$(powersh \
    'Get-DnsClientServerAddress `
     | ForEach-Object ServerAddresses `
     | select -Unique')

  # Alternatively
  nameservers=$(powersh \
    'Get-NetIPConfiguration `
     | ForEach-Object DNSServer `
     | ForEach-Object ServerAddresses `
     | select -Unique')

...

-- 
Regards,
Christian


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