Parse proxy protocol

[silviucpp]

In case you want to load balance the servers with an HAPROXY and you need to properly detect the peer ip you need to use the PROXY PROTOCOL: http://www.haproxy.org/download/1.8/doc/proxy-protocol.txt

[mworrell]

I guess it is a bit tricky to add a test for this?
(Considering you need some proxy to talk to...)

[silviucpp]

@ mworrell the fix is not proper. I will adjust it in the next days.

[silviucpp]

I made the implementation much easy by using {packet, line}. Previous one was wrong because I was reading from socket also additional data coming after the proxy protocol.

[silviucpp]

can be tested with haproxy basic config:

listen smtp-server

        bind :5878
        mode tcp
        option  tcplog
        balance roundrobin

        server smtp_tcp_s01 127.0.0.1:2525 check port 2525 send-proxy inter 4s rise 3 fall 2

[Vagabond]

You should probably use the right, address specific parser for v4 or v6, so if the proxy sends TCP4 with a v6 address, things fail.

[silviucpp]

Huh... can you be more explicit ?

[Vagabond]

There's also a binary form of this protocol (version 2), were you planning on supporting this as well?

[silviucpp]

We can support if you think it makes sense. Idea is that you have control in what version you want to use:

send-proxy is v1 (current implementation)
send-proxy-v2 - is v2