2011/7/14 Michal Novotny <minovotn@redhat.com>:
Hi guys, some time ago I've been investigating the options to get the guest's IP address information without having to connect to guest's VNC window or console. It was for one project I've been working on and I found that the solution lies in the procfs, precisely in the /proc/{PID}/net/arp...
The format is as follows:
$ cat /proc/{PID}/net/arp IP address HW type Flags HW address Mask Device 192.168.122.36 0x1 0x2 52:54:00:35:76:e6 * virbr0
where the HW address matches the MAC address associated to the guest's NIC. Implementing such an API shouldn't be a big problem however I know that there's some option to run libvirt on Windows machines. It should be just the client so it shouldn't really matter however I'd like to ask you whether it's really not an issue.
Windows or not is irrelevant here as the IP address lookup cannot be implemented in a general way/place, but will have to be implemented by the hypervisor/network drivers.
The function should return a string of the guest's IP address as read from the procfs or return a NULL value if there's no IP address associated with the guest.
If the multiple NICs are being used by the guest then the function should return either the IP address matching the MAC address passed to the function or the first IP address if omitted.
The prototype should be:
char *virDomainGetIPAddress(virDomainPtr domain, char *devmac);
First of all you're missing the unsigned int flags parameter. Also did you consider that the MAC to IP(v4|v6) mapping isn't necessarily a 1:1 mapping, but the signature of your function requires this? -- Matthias Bolte http://photron.blogspot.com