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.
remove not used chansrv <-> xrdp messages
move static channel disable control into libxrdp
remove some blocking read, write chansrv calls
add drdynvc calls to libxrdp
add drdynvc calls to chansrv
channel cleanup
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.
Use XRDP_SOCKET_PATH in file_loc.h
Don't define any non-socket paths in file_loc.h, they should come from
the makefiles.
Define all paths unconditionally, they should not be defined elsewhere.
Pass XRDP_SOCKET_PATH as environment variable to the backends.
In C, an empty argument list in a declaration means that the function
can accept any arguments. Use "void" instead, it means "no arguments".
C++ treats void and empty list as "no arguments".
AM_CPPFLAGS is a documented Automake variable for C preprocessor flags
that should not be overridden when compiling the package.
There is no need to have two additional variables that are ultimately
merged into AM_CPPFLAGS.
Their names are also confusing. EXTDA_DIST is a documented Automake
variable. Everything else that starts with "EXTRA" is not.
libdir is for shared and static libraries. Some xrdp libraries are loaded
dynamically from a non-standard directory, so they are used like modules.
Having separate libdir and moduledir would eventually allow to separate
dynamically loaded modules from shared libraries.
AM_CPPFLAGS is for flags passed to the preprocessor, such as defines and
includes. AM_CFLAGS is for flags affecting the compiler, such as debug
and optimization settings.
INCLUDES is an obsolete name. Users can pass INCLUDES and break
compilation. AM_CPPFLAGS is more explicit that the flags come from
Automake and should not be overridden.
