Hi!

As you may know, the proxy protocol [1,2] is a way to communicate
a client's IP address to a backend server sitting behind a proxy
front-end. It is the equivalent of the X-Forwarded-For HTTP
header, but done at Layer 4.  This protocol was originally
proposed by one of the HAProxy developers and its support is
becoming more widespread. Percona, Amazon AWS, HAProxy, NGINX,
and others.

Mariadb's Jira shows an unassigned feature request for it, but
with no one apparently assigned to it [3].

Percona supports proxy protocol [4]. For the configuration part,
Percona defines a global variable that gives the IP address of
the proxy front-ends that are authorized to send a proxy protocol
header.

Percona's handler code for the proxy protocol (minus the global
variable handling) is in the vio/viosockets.c file [4] I looked
at Percona's implementation. This file looks very similar to
MariaDb's own viosockets.c file [5] so it may a potential good
insertion point. Percona's software license seems to be permisive
enough for reusing / adapting their code [6].

Please correct me if I'm wrong but it seems no one is currently
working on this feature right now. I'd like to know
if you would be interested in help side-porting
Percona's proxy protocol code to MariaDB. I'll probably need
some help or pointers on how to add a global
variable, though.

Best regards,

--jose

[1] Proxy protocol documentation
https://blog.haproxy.com/haproxy/proxy-protocol/

[2] Proxy protocol specification
www.haproxy.org/download/1.8/doc/proxy-protocol.txt

[3] Mariadb feature request for proxy protocol
https://jira.mariadb.org/browse/MDEV-11159?jql=project%20%3D%20MDEV%20AND%20text%20~%20proxy

[3] Percona proxy protocol manual page
https://www.percona.com/doc/percona-server/5.6/flexibility/proxy_protocol_support.html

[4] Percona proxy protocol handler code
https://github.com/percona/percona-server/blob/1e2f003a5bd48763c27e37542d97cd8f59d98eaa/vio/viosocket.c#L738
https://github.com/percona/percona-server/blob/1e2f003a5bd48763c27e37542d97cd8f59d98eaa/vio/viosocket.c#L1006

[5] mariadb potential insertion pode for proxy protocol code
https://github.com/MariaDB/server/blob/bb2c1a52c61706dde8c525a8887f2d364c0db1eb/vio/viosocket.c#L832

[6] Percona software license
https://www.percona.com/doc/percona-server/LATEST/copyright.html

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