I want to experiment a bit with the vchan library and develop a program that
make unprivileged VMs communicate without using the network and without Qrexec
or any Qubes specific framework.
Qubes OS run on top of Xen, so it should be possible to use the vchan library
inside the unprivileged domains.
1) In the sites its described a communication between Dom0 and a VM, but I need
to establish variuos bidirectional channels between VMs. Is it possible?
2) Does Qubes OS use a different version of the vchan library or set up
specific limitations that could make the job harder?
3) In the libs folders I found all the libraries I think I need, but I couldn't
find any header (libxenvchan.h, ...) in the VMs systems, so do I need to
compile and install Xen from source, to be able to write my own programs, even
on Qubes?
And if I wanted to distribute a package, the default Debian/Fedora templates
would need extra deps?
I've tried to write a new header with the `extern` declarations and compile
'node.c' from /xen/tools/libvchan:
[https://github.com/xen-project/xen/blob/master/tools/libvchan/node.c] as a
test, linking the binary to 'libvchan-xen.so', which I think its Qubes specific
and 'libxenvchan.so' in a second attempt.
The compilation succeded, but the program couldn't establish any connections
between VMs:
user@develop:~/myvchan$ ./node server write 3 /data/vchan
libxenvchan_*_init: Permission denied
user@develop:~/myvchan$ ./node server write 3
libxenvchan_*_init: Permission denied
user@develop:~/myvchan$ ./node client read 3 /data/vchan
libxenvchan_*_init: Permission denied
user@develop:~/myvchan$ ./node client read 3 /local/domain//myc
libxenvchan_*_init: No such file or directory
user@develop:~/myvchan$ xenstore-exists /local/domain//matrix
user@develop:~/myvchan$ echo $?
0
Anyone can explain me what I'm missing and guide me through the right procedure
?
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