net: add bare Interface implementation

src/net/interface_tinygo.go

@@ -0,0 +1,53 @@
+// +build tinygo
+
+package net
+
+const (
+	tinyGoInterfaceName = "tinygo-undefined"
+	maxTransmissionUnit = 1500 // Ethernet?
+)
+
+// DE:AD:BE:EF:FE:FF
+var defaultMAC = HardwareAddr{0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xFF}
+
+// If the ifindex is zero, interfaceTable returns mappings of all
+// network interfaces. Otherwise it returns a mapping of a specific
+// interface.
+func interfaceTable(ifindex int) ([]Interface, error) {
+	i, err := readInterface(0)
+	if err != nil {
+		return nil, err
+	}
+	return []Interface{*i}, nil
+}
+
+func readInterface(i int) (*Interface, error) {
+	if i != 0 {
+		return nil, errInvalidInterfaceIndex
+	}
+	ifc := &Interface{
+		Index:        i + 1, // Offset the index by one to suit the contract
+		Name:         tinyGoInterfaceName,
+		MTU:          maxTransmissionUnit,
+		HardwareAddr: defaultMAC,
+		Flags:        0, // No flags since interface is not implemented.
+	}
+	return ifc, nil
+}
+
+func interfaceCount() (int, error) {
+	return 1, nil
+}
+
+// If the ifi is nil, interfaceAddrTable returns addresses for all
+// network interfaces. Otherwise it returns addresses for a specific
+// interface.
+func interfaceAddrTable(ifi *Interface) ([]Addr, error) {
+	return nil, nil
+}
+
+// interfaceMulticastAddrTable returns addresses for a specific
+// interface.
+func interfaceMulticastAddrTable(ifi *Interface) ([]Addr, error) {
+	return nil, nil
+}