Am 07.09.17 um 11:55 schrieb Antonio Quartulli:
> From: Antonio Quartulli <anto...@openvpn.net>
> 
> Commit 23d61c56 introduced the AF_UNSPEC socket family
> to be used when we don't know the actual one until the local
> socket binding is performed.
> 
> In such case AF_UNSPEC is stored in the `ce.af` member of
> the `c->options` object, indicating that the family has to be
> determined at runtime.
> 
> However, the determined value is never propagated back to the
> `options` object, which remains AF_UNSPEC and that is
> later used to initialize the TCP children contexts (UDP
> children contexts are unaffected).
> 
> This unexpected setting can trigger weird behaviours, like
> the one reported in ticket #933.
> In this case the value AF_UNSPEC in combination with the
> changes implemented in 2bed089d are leading to a TCP
> server quitting with M_FATAL upon client connection.
> 
> Note that the misbehaviour described in #933 can only be
> triggered when running a TCP server with mtu-disc set
> in the config (no matter the value).
> 
> Fix this inconsistency by always propagating the AF
> family from the top to the child context when running
> in TCP server mode.
>

ACK. That is a really weird corner case that I must have missed :)

Arne

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