2 files changed, 31 insertions, 0 deletions
diff --git a/dhcpv4/utils.go b/dhcpv4/utils.go
new file mode 100644
index 0000000..d95f586
--- /dev/null
+++ b/dhcpv4/utils.go
@@ -0,0 +1,14 @@
+package dhcpv4
+
+// IsRequested function takes a DHCPv4 message and an OptionCode, and returns
+// true if that option is within the requested options of the DHCPv6 message.
+func IsRequested(pkt *DHCPv4, requested OptionCode) bool {
+	for _, optprl := range pkt.GetOption(OptionParameterRequestList) {
+		for _, o := range optprl.(*OptParameterRequestList).RequestedOpts {
+			if o == requested {
+				return true
+			}
+		}
+	}
+	return false
+}
diff --git a/dhcpv4/utils_test.go b/dhcpv4/utils_test.go
new file mode 100644
index 0000000..d722466
--- /dev/null
+++ b/dhcpv4/utils_test.go
@@ -0,0 +1,17 @@
+package dhcpv4
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestIsRequetsed(t *testing.T) {
+	pkt, err := New()
+	require.NoError(t, err)
+	require.False(t, IsRequested(pkt, OptionDomainNameServer))
+
+	optprl := OptParameterRequestList{RequestedOpts: []OptionCode{OptionDomainNameServer}}
+	pkt.AddOption(&optprl)
+	require.True(t, IsRequested(pkt, OptionDomainNameServer))
+}