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Implement HAProxy protocol support

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This patch implements support for incoming connections wrapped in the
HAProxy protocol v1.

This is useful when running chasquid behind a HAProxy server, as it
needs the original source IP to perform SPF checks.

This patch is a reimplementation of one originally provided by Denys
Vitali in pull request #15, except the logic for the protocol handling
is moved to a new package, and the smtpsrv.Conn handling of the source
IP is simplified.

It is marked as experimental for now, since we want to give it a bit
more exposure just in case the option/api needs adjustment.

Thanks a lot to Denys Vitali (@denysvitali in github) for sending the
original patch for this, and helping test it!
This commit is contained in:
Alberto Bertogli
2020-11-12 22:00:46 +00:00
parent c9d3ba0ca0
commit e79586a014
22 changed files with 389 additions and 24 deletions
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test/Dockerfile
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@@ -25,7 +25,8 @@ RUN apt-get install -y -q python3 msmtp
# Install the optional packages for the integration tests.
RUN apt-get install -y -q \
gettext-base dovecot-imapd \
exim4-daemon-light
exim4-daemon-light \
haproxy
# Install sudo, needed for the docker entrypoint.
RUN apt-get install -y -q sudo