Revision history [back]

rosnode machine will list the machines (ie: hosts) that the master knows about, and rosnode machine <hostname> will list all nodes that run on a particular machine (ie: hostname).

As for how to do this with the Master API, take a look at how rosnode does this internally, specifically the get_machines_by_nodes() and get_nodes_by_machine() methods (here).

If you're going to be using this often, consider that these methods incur quite some overhead:

This is a very costly procedure as it must do N lookups with the Master, where N is the number of nodes.