[Bug 41615] New: StreamTubeServer doesn't support exporting services listening only on an Unix socket

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=41615

           Summary: StreamTubeServer doesn't support exporting services
                    listening only on an Unix socket
           Product: Telepathy
           Version: git master
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: low
         Component: tp-qt4
        AssignedTo: telepathy-bugs at lists.freedesktop.org
        ReportedBy: ollisal at gmail.com
         QAContact: telepathy-bugs at lists.freedesktop.org


Probably not very big of a problem, which is why we're merging STS although it
has this limitation. The API has sufficient flexibility, though, to allow
adding Unix socket support later.

Reasons it was left out originally:
 - TCP sockets allow us to more conveniently associate ongoing connections with
the remote contacts they're from as long as the CM supports
Socket_Access_Control_Port (gabble does), as there are only so many (256)
different 8-bit credential byte values for Unix, and credential bytes can't be
even used with all protocols as they are in-line with the protocol bytestream
 - I don't know of any services which couldn't be configured to also listen on
TCP. X11 and cups can be, for example - so they're likely to be exported as TCP
services due to the above limitation with connection monitoring
 - The spec only requires CMs to support TCPv4 sockets too. Gabble supports all
the address types anyway though.

Reasons why it would still be nice to have one day:
 - Maybe better performance than TCP sockets for the same service? Dunno how
much better, or if at all on practical systems.
 - Credentials AC allows restricting the processes allowed to connect to those
from the same UID (like our protocol backend), without explicitly
authenticating using the tube payload protocol
 - After all, some services might be really Unix only. At least X11 is in its
usual distro configs (-nolisten tcp) and it's a bit crappy to have to change
that.

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