[Bug 1664] New: add support for tagging session channels with friendly names and add "ps" control command

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1664

           Summary: add support for tagging session channels with friendly
                    names and add "ps" control command
           Product: Portable OpenSSH
           Version: -current
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: ssh
        AssignedTo: unassigned-bugs at mindrot.org
        ReportedBy: sfandino at yahoo.com


Created an attachment (id=1706)
 --> (https://bugzilla.mindrot.org/attachment.cgi?id=1706)
adds the base channel tagging code

The attached patches add support for tagging the session channels with
friendly names and listing them with a new control command (ps).

At present, the PID of the local controlling process is used as the tag
though a new flag could be added to let the user select a different one
(but the PID is so convenient... :-).

There are three patches:

 #1 adds the base channel tagging code
 #2 cleanups mux.c so it becomes easier to add new mux commands
 #3 adds support for the ps command and passing the slave pid through
the mux channel when requesting a new session.

This is mostly the same as the patch I had added to ticket 1424 but
without the kill command support.

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