func (*UtilsSuite) TestParseInterfaceType(c *gc.C) {
fakeSysPath := filepath.Join(c.MkDir(), network.SysClassNetPath)
err := os.MkdirAll(fakeSysPath, 0700)
c.Check(err, jc.ErrorIsNil)
writeFakeUEvent := func(interfaceName string, lines ...string) string {
fakeInterfacePath := filepath.Join(fakeSysPath, interfaceName)
err := os.MkdirAll(fakeInterfacePath, 0700)
c.Check(err, jc.ErrorIsNil)
fakeUEventPath := filepath.Join(fakeInterfacePath, "uevent")
contents := strings.Join(lines, "\n")
err = ioutil.WriteFile(fakeUEventPath, []byte(contents), 0644)
c.Check(err, jc.ErrorIsNil)
return fakeUEventPath
}
result := network.ParseInterfaceType(fakeSysPath, "missing")
c.Check(result, gc.Equals, network.UnknownInterface)
writeFakeUEvent("eth0", "IFINDEX=1", "INTERFACE=eth0")
result = network.ParseInterfaceType(fakeSysPath, "eth0")
c.Check(result, gc.Equals, network.UnknownInterface)
fakeUEventPath := writeFakeUEvent("eth0.42", "DEVTYPE=vlan")
result = network.ParseInterfaceType(fakeSysPath, "eth0.42")
c.Check(result, gc.Equals, network.VLAN_8021QInterface)
os.Chmod(fakeUEventPath, 0000) // permission denied error is OK
result = network.ParseInterfaceType(fakeSysPath, "eth0.42")
c.Check(result, gc.Equals, network.UnknownInterface)
writeFakeUEvent("bond0", "DEVTYPE=bond")
result = network.ParseInterfaceType(fakeSysPath, "bond0")
c.Check(result, gc.Equals, network.BondInterface)
writeFakeUEvent("br-ens4", "DEVTYPE=bridge")
result = network.ParseInterfaceType(fakeSysPath, "br-ens4")
c.Check(result, gc.Equals, network.BridgeInterface)
// First DEVTYPE found wins.
writeFakeUEvent("foo", "DEVTYPE=vlan", "DEVTYPE=bridge")
result = network.ParseInterfaceType(fakeSysPath, "foo")
c.Check(result, gc.Equals, network.VLAN_8021QInterface)
writeFakeUEvent("fake", "DEVTYPE=warp-drive")
result = network.ParseInterfaceType(fakeSysPath, "fake")
c.Check(result, gc.Equals, network.UnknownInterface)
}
// GetObservedNetworkConfig uses the given source to find all available network
// interfaces and their assigned addresses, and returns the result as
// []params.NetworkConfig. In addition to what the source returns, a few
// additional transformations are done:
//
// * On any OS, the state (UP/DOWN) of each interface and the DeviceIndex field,
// will be correctly populated. Loopback interfaces are also properly detected
// and will have InterfaceType set LoopbackInterface.
// * On Linux only, the InterfaceType field will be reliably detected for a few
// types: BondInterface, BridgeInterface, VLAN_8021QInterface.
// * Also on Linux, for interfaces that are discovered to be ports on a bridge,
// the ParentInterfaceName will be populated with the name of the bridge.
// * ConfigType fields will be set to ConfigManual when no address is detected,
// or ConfigStatic when it is.
// * TODO: any IPv6 addresses found will be ignored and treated as empty ATM.
//
// Result entries will be grouped by InterfaceName, in the same order they are
// returned by the given source.
func GetObservedNetworkConfig(source NetworkConfigSource) ([]params.NetworkConfig, error) {
logger.Tracef("discovering observed machine network config...")
interfaces, err := source.Interfaces()
if err != nil {
return nil, errors.Annotate(err, "cannot get network interfaces")
}
var namesOrder []string
nameToConfigs := make(map[string][]params.NetworkConfig)
sysClassNetPath := source.SysClassNetPath()
for _, nic := range interfaces {
nicType := network.ParseInterfaceType(sysClassNetPath, nic.Name)
nicConfig := interfaceToNetworkConfig(nic, nicType)
if nicType == network.BridgeInterface {
updateParentForBridgePorts(nic.Name, sysClassNetPath, nameToConfigs)
}
seenSoFar := false
if existing, ok := nameToConfigs[nic.Name]; ok {
nicConfig.ParentInterfaceName = existing[0].ParentInterfaceName
// If only ParentInterfaceName was set in a previous iteration (e.g.
// if the bridge appeared before the port), treat the interface as
// not yet seen.
seenSoFar = existing[0].InterfaceName != ""
}
if !seenSoFar {
nameToConfigs[nic.Name] = []params.NetworkConfig(nil)
namesOrder = append(namesOrder, nic.Name)
}
addrs, err := source.InterfaceAddresses(nic.Name)
if err != nil {
return nil, errors.Annotatef(err, "cannot get interface %q addresses", nic.Name)
}
if len(addrs) == 0 {
logger.Infof("no addresses observed on interface %q", nic.Name)
nameToConfigs[nic.Name] = append(nameToConfigs[nic.Name], nicConfig)
continue
}
for _, addr := range addrs {
addressConfig, err := interfaceAddressToNetworkConfig(nic.Name, nicConfig.ConfigType, addr)
if err != nil {
return nil, errors.Trace(err)
}
// Need to copy nicConfig so only the fields relevant for the
// current address are updated.
nicConfigCopy := nicConfig
nicConfigCopy.Address = addressConfig.Address
nicConfigCopy.CIDR = addressConfig.CIDR
nicConfigCopy.ConfigType = addressConfig.ConfigType
nameToConfigs[nic.Name] = append(nameToConfigs[nic.Name], nicConfigCopy)
}
}
// Return all interfaces configs in input order.
var observedConfig []params.NetworkConfig
for _, name := range namesOrder {
observedConfig = append(observedConfig, nameToConfigs[name]...)
}
logger.Tracef("observed network config: %+v", observedConfig)
return observedConfig, nil
}
