poll() is specified in POSIX.1-2001 as a simpler interface for
multiplexed file descriptors than select(). It also provides more
functionality.
This PR replaces the select() calls used in xrdp with poll()
equivalents.
Add xrdp-ssh-agent.c which forwards ssh-agent protocol over an RDP
dynamic virtual channel, just as the normal ssh-agent forwards it over
an SSH channel.
Usage:
Run an RDP client with the corresponding plugin enabled; for example
"xfreerdp /ssh-agent ...".
In the remote desktop session run xrdp-ssh-agent and evaluate the output
in the shell as for ssh-agent to set the required environment variables
(specifically $SSH_AUTH_SOCK):
eval "$(xrdp-ssh-agent -s)"
This is the same as for the normal ssh-agent. You would typically do
this in your Xsession or /etc/xrdp/startwm.sh.
Limitations:
1. Error checking and handling could be improved.
2. This stays running when the xrdp session closes. This should be
fixed using a command line argument as for the real ssh-agent.
3. This is only tested on Linux and will only work on systems where
clients talk to the ssh-agent via Unix domain sockets. It won't
currently work on Windows but it could be ported.
matt335672