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package interfaces
import "net"
// InterfaceMatcher is a function type used to match the interfaces we want. See
// GetInterfacesFunc below for usage.
type InterfaceMatcher func(net.Interface) bool
// interfaceGetter is used for testing purposes
var interfaceGetter = net.Interfaces
// GetInterfacesFunc loops through the available network interfaces, and returns
// a list of interfaces for which the passed InterfaceMatcher function returns
// true.
func GetInterfacesFunc(matcher InterfaceMatcher) ([]net.Interface, error) {
ifaces, err := interfaceGetter()
if err != nil {
return nil, err
}
ret := make([]net.Interface, 0)
for _, iface := range ifaces {
if matcher(iface) {
ret = append(ret, iface)
}
}
return ret, nil
}
// GetLoopbackInterfaces returns a list of loopback interfaces.
func GetLoopbackInterfaces() ([]net.Interface, error) {
return GetInterfacesFunc(func(iface net.Interface) bool {
return iface.Flags&net.FlagLoopback != 0
})
}
// GetNonLoopbackInterfaces returns a list of non-loopback interfaces.
func GetNonLoopbackInterfaces() ([]net.Interface, error) {
return GetInterfacesFunc(func(iface net.Interface) bool {
return iface.Flags&net.FlagLoopback == 0
})
}
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