[libvirt-users] How to use ext transport?

Hi, I would like to use the ext transport mode to migrate VMs between two hosts, but I didn't find any documentation about the ext interface. I have successfully migrate a vm with a programm that passes it's incomming messages through the network to libvirts socket on the target server. But the external program on the source side didn't get the connection URI or the server address or port. Is is possible to pass some arguments to the external programm or how can the external programm get the connection URI? My migration command looks like: virsh migrate --live --verbose myvm qemu+ext://targethost:7866/system?command=/root/dev/bin/trans At the moment I've written the target host and the port in the transport programm, but I think there have to be a better solution... -- Christian