v6: add IA AddressOptions (StatusCode only)

Signed-off-by: Chris Koch <chrisko@google.com>

2 files changed, 27 insertions, 7 deletions

diff --git a/dhcpv6/option_iaaddress.go b/dhcpv6/option_iaaddress.go
index c4184e1..9752ee7 100644
--- a/dhcpv6/option_iaaddress.go
+++ b/dhcpv6/option_iaaddress.go
@@ -8,6 +8,26 @@ import (
 	"github.com/u-root/u-root/pkg/uio"
 )
 
+// AddressOptions are options valid for the IAAddress option field.
+//
+// RFC 8415 Appendix C lists only the Status Code option as valid.
+type AddressOptions struct {
+	Options
+}
+
+// Status returns the status code associated with this option.
+func (ao AddressOptions) Status() *OptStatusCode {
+	opt := ao.Options.GetOne(OptionStatusCode)
+	if opt == nil {
+		return nil
+	}
+	sc, ok := opt.(*OptStatusCode)
+	if !ok {
+		return nil
+	}
+	return sc
+}
+
 // OptIAAddress represents an OptionIAAddr.
 //
 // This module defines the OptIAAddress structure.
@@ -16,7 +36,7 @@ type OptIAAddress struct {
 	IPv6Addr          net.IP
 	PreferredLifetime time.Duration
 	ValidLifetime     time.Duration
-	Options           Options
+	Options           AddressOptions
 }
 
 // Code returns the option's code
@@ -39,7 +59,7 @@ func (op *OptIAAddress) ToBytes() []byte {
 }
 
 func (op *OptIAAddress) String() string {
-	return fmt.Sprintf("OptIAAddress{ipv6addr=%v, preferredlifetime=%v, validlifetime=%v, options=%v}",
+	return fmt.Sprintf("IAAddress: IP=%v PreferredLifetime=%v ValidLifetime=%v Options=%v",
 		op.IPv6Addr, op.PreferredLifetime, op.ValidLifetime, op.Options)
 }
 
diff --git a/dhcpv6/option_iaaddress_test.go b/dhcpv6/option_iaaddress_test.go
index 4db999c..900973c 100644
--- a/dhcpv6/option_iaaddress_test.go
+++ b/dhcpv6/option_iaaddress_test.go
@@ -54,9 +54,9 @@ func TestOptIAAddressToBytes(t *testing.T) {
 		IPv6Addr:          net.IP(ipBytes),
 		PreferredLifetime: 0x0a0b0c0d * time.Second,
 		ValidLifetime:     0x0e0f0102 * time.Second,
-		Options: []Option{
+		Options: AddressOptions{[]Option{
 			OptElapsedTime(10 * time.Millisecond),
-		},
+		}},
 	}
 	require.Equal(t, expected, opt.ToBytes())
 }
@@ -74,17 +74,17 @@ func TestOptIAAddressString(t *testing.T) {
 	str := opt.String()
 	require.Contains(
 		t, str,
-		"ipv6addr=2401:203:405:607:809:a0b:c0d:e0f",
+		"IP=2401:203:405:607:809:a0b:c0d:e0f",
 		"String() should return the ipv6addr",
 	)
 	require.Contains(
 		t, str,
-		"preferredlifetime=1m10s",
+		"PreferredLifetime=1m10s",
 		"String() should return the preferredlifetime",
 	)
 	require.Contains(
 		t, str,
-		"validlifetime=50s",
+		"ValidLifetime=50s",
 		"String() should return the validlifetime",
 	)
 }