Add ifIndex support

net/net.go

@@ -26,7 +26,6 @@ type IOCountersStat struct {
 	Dropout     uint64 `json:"dropout"`     // total number of outgoing packets which were dropped (always 0 on OSX and BSD)
 	Fifoin      uint64 `json:"fifoin"`      // total number of FIFO buffers errors while receiving
 	Fifoout     uint64 `json:"fifoout"`     // total number of FIFO buffers errors while sending
-
 }
 
 // Addr is implemented compatibility to psutil
@@ -58,6 +57,7 @@ type InterfaceAddr struct {
 }
 
 type InterfaceStat struct {
+	Index        int             `json:"index"`
 	MTU          int             `json:"mtu"`          // maximum transmission unit
 	Name         string          `json:"name"`         // e.g., "en0", "lo0", "eth0.100"
 	HardwareAddr string          `json:"hardwareaddr"` // IEEE MAC-48, EUI-48 and EUI-64 form
@@ -121,6 +121,7 @@ func InterfacesWithContext(ctx context.Context) ([]InterfaceStat, error) {
 	for _, ifi := range is {
 
 		var flags []string
+
 		if ifi.Flags&net.FlagUp != 0 {
 			flags = append(flags, "up")
 		}
@@ -138,6 +139,7 @@ func InterfacesWithContext(ctx context.Context) ([]InterfaceStat, error) {
 		}
 
 		r := InterfaceStat{
+			Index:        ifi.Index,
 			Name:         ifi.Name,
 			MTU:          ifi.MTU,
 			HardwareAddr: ifi.HardwareAddr.String(),