diff options
| -rw-r--r-- | ipv6.go | 19 | ||||
| -rw-r--r-- | ipv6_test.go | 19 |
2 files changed, 38 insertions, 0 deletions
@@ -0,0 +1,19 @@ +package soundbox + +import ( + "fmt" + "net" +) + +// toLinkLocal converts a MAC address to the corresponding IPv6 link-local +// address. +func toLinkLocal(ha net.HardwareAddr) (net.IP, error) { + switch len(ha) { + case 6: + ip := net.IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, + ha[0] ^ 0b10, ha[1], ha[2], 0xff, 0xfe, ha[3], ha[4], ha[5]} + return ip, nil + default: + return nil, fmt.Errorf("Only IEEE 802 MAC-48 addresses supported") + } +} diff --git a/ipv6_test.go b/ipv6_test.go new file mode 100644 index 0000000..d46408b --- /dev/null +++ b/ipv6_test.go @@ -0,0 +1,19 @@ +package soundbox + +import ( + "net" + "reflect" + "testing" +) + +func TestToLinkLocal(t *testing.T) { + input := net.HardwareAddr{0xab, 0xcd, 0xef, 0x12, 0x34, 0x56} + expected := net.IP{0xfe, 0x80, 0, 0, 0, 0, 0, 0, 0xa9, 0xcd, 0xef, 0xff, 0xfe, 0x12, 0x34, 0x56} + computed, err := toLinkLocal(input) + if err != nil { + t.Errorf("Failed to call toLinkLocal(): %v", err) + } + if !reflect.DeepEqual(computed, expected) { + t.Errorf("Computed IPv6 link-local address %v did not match expectation %v", computed, expected) + } +} |