Make networking code reusable

To prevent code duplication when creating new network backends move
reusable code into a separate internal package.

This allows all network backends to use the same code as long as they
implement the new NetUtil interface.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

1 files changed, 34 insertions, 0 deletions

diff --git a/libpod/network/internal/util/interfaces.go b/libpod/network/internal/util/interfaces.go
new file mode 100644
index 000000000..20819f756
--- /dev/null
+++ b/libpod/network/internal/util/interfaces.go
@@ -0,0 +1,34 @@
+package util
+
+import "net"
+
+// getLiveNetworkSubnets returns a slice of subnets representing what the system
+// has defined as network interfaces
+func getLiveNetworkSubnets() ([]*net.IPNet, error) {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return nil, err
+	}
+	nets := make([]*net.IPNet, 0, len(addrs))
+	for _, address := range addrs {
+		_, n, err := net.ParseCIDR(address.String())
+		if err != nil {
+			return nil, err
+		}
+		nets = append(nets, n)
+	}
+	return nets, nil
+}
+
+// GetLiveNetworkNames returns a list of network interface names on the system
+func GetLiveNetworkNames() ([]string, error) {
+	liveInterfaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+	interfaceNames := make([]string, 0, len(liveInterfaces))
+	for _, i := range liveInterfaces {
+		interfaceNames = append(interfaceNames, i.Name)
+	}
+	return interfaceNames, nil
+}