Add restartability to sesman #3346
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matt335672
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This function does not need to have global scope.
The function sesexce_scp_data_in in sesexec.c is a development artefact and can safely be removed
This is used by sesman to connect to sockets in the restart directory.
Adds a module which can be used when sesman is restarting. This is initially used to rediscover sessions from a previous run.
Also add useful comment to session_send_term()
The module is a dummy to be filled in later Other structural changes to sesexec:- 1) A failure of sesman needs to be detected and handled without causing sesexec to exit 2) If sesexec exits, the session can never be rediscovered. sesexec must be robust enough to stay up for the lifetime of the session so that the discovery function always works. 3) There is a mechanism for sesexec to terminate the session, but it doesn't work, as SIGCHLD is not processed while we are waiting for the session to finish. This needs fixing.
These sesexec functions are needed for the discovery module to function.
Add functionality to sesexec discovery module to enable sesman restarts.
The KillMode of process allows an xrdp connection to survive a reatart of the xrdp process. This is of minimal benefit, as a user can always simply reconnect - the session will survive the restart. The downside is that xrdp will not benefit from any security fixes, and may well end up out-of-sync with sesman.
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I'll try this next. |
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I've added a minor update to this wiki page documenting the recovery directory used by this PR. https://github.com/neutrinolabs/xrdp/wiki/The-socketdir-directory |
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This is now ready for review.
Fixes #800
Depends on #3328
See also #819
This PR allows for sesman to be restarted without losing sessions.
A restart of xrdp will still drop connections, but these can easily be restarted.
In brief, the design is this (I can add more details around this):-