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makeKey can not be redirected using shell #8130

Gunni opened this issue Jul 27, 2019 · 0 comments

makeKey can not be redirected using shell #8130

Gunni opened this issue Jul 27, 2019 · 0 comments


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@Gunni Gunni commented Jul 27, 2019

  • Program: dnsdist
  • Issue type: Bug report

Short description

I was attempting to use echo "makeKey()" | dnsdist to get a usable console key, it works, but when I then did echo "makeKey()" | dnsdist | grep setKey it stopped working.


  • Operating system: Fedora 30
  • Software version: 1.3.3 (Lua 5.1.4 [LuaJIT 2.1.0-beta3]) with dns-over-tls(openssl) dnscrypt ebpf libsodium protobuf recvmmsg/sendmmsg systemd
  • Software source: Operating system repository

Steps to reproduce

  1. echo "makeKey()" | dnsdist works
  2. echo "makeKey()" | dnsdist -C /dev/null works (config is not relevant)
  3. echo "makeKey()" | dnsdist | cat does not work, because setKey is not printed when piped

Expected behaviour

The setKey line gets printed.

Actual behaviour

The setKey does not get printed when stdout/stderr is redirected.

Other information

makeKey is implemented here but I can not find where g_outputBuffer is printed.


My idea was to make ansible run echo "makeKey()" | dnsdist | grep setKey > /etc/dnsdist/key/key.conf if it didn't exist and then to do a includeDirectory /etc/dnsdist/key in the main config file.


It would be nice if there was a dnsdist --print-new-key command that just printed a new key, no reading configs, or starting the server or listening on sockets or anything.

dwfreed added a commit to dwfreed/pdns that referenced this issue Jul 27, 2019
cout may not be a tty, in which case it is block buffered by stdlib, so
flush it after printing g_outputBuffer.

Fixes PowerDNS#8130
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