// getAddressForInterfaceImpl looks for the network interface
// and returns the IPv4 address from the possible addresses.
func getAddressForInterfaceImpl(interfaceName string) (string, error) {
iface, err := net.InterfaceByName(interfaceName)
if err != nil {
logger.Errorf("cannot find network interface %q: %v", interfaceName, err)
return "", err
}
addrs, err := iface.Addrs()
if err != nil {
logger.Errorf("cannot get addresses for network interface %q: %v", interfaceName, err)
return "", err
}
return utils.GetIPv4Address(addrs)
}
func (*networkSuite) TestGetIPv4Address(c *gc.C) {
for _, test := range []struct {
addresses []net.Addr
expected string
errorString string
}{{
addresses: makeAddresses(
"complete",
"nonsense"),
errorString: "invalid CIDR address: complete",
}, {
addresses: makeAddresses(
"fe80::90cf:9dff:fe6e:ece/64",
),
errorString: "no addresses match",
}, {
addresses: makeAddresses(
"fe80::90cf:9dff:fe6e:ece/64",
"10.0.3.1/24",
),
expected: "10.0.3.1",
}, {
addresses: makeAddresses(
"10.0.3.1/24",
"fe80::90cf:9dff:fe6e:ece/64",
),
expected: "10.0.3.1",
}} {
ip, err := utils.GetIPv4Address(test.addresses)
if test.errorString == "" {
c.Assert(err, gc.IsNil)
c.Assert(ip, gc.Equals, test.expected)
} else {
c.Assert(err, gc.ErrorMatches, test.errorString)
c.Assert(ip, gc.Equals, "")
}
}
}
