1 files changed, 52 insertions, 0 deletions
diff --git a/dhcpv4/option_class_identifier.go b/dhcpv4/option_class_identifier.go
new file mode 100644
index 0000000..ae5dba2
--- /dev/null
+++ b/dhcpv4/option_class_identifier.go
@@ -0,0 +1,52 @@
+package dhcpv4
+
+import (
+	"fmt"
+)
+
+// This option implements the Class Identifier option
+// https://tools.ietf.org/html/rfc2132
+
+// OptClassIdentifier represents the DHCP message type option.
+type OptClassIdentifier struct {
+	Identifier string
+}
+
+// ParseOptClassIdentifier constructs an OptClassIdentifier struct from a sequence of
+// bytes and returns it, or an error.
+func ParseOptClassIdentifier(data []byte) (*OptClassIdentifier, error) {
+	// Should at least have code and length
+	if len(data) < 2 {
+		return nil, ErrShortByteStream
+	}
+	code := OptionCode(data[0])
+	if code != OptionClassIdentifier {
+		return nil, fmt.Errorf("expected option %v, got %v instead", OptionClassIdentifier, code)
+	}
+	length := int(data[1])
+	if len(data) < 2+length {
+		return nil, ErrShortByteStream
+	}
+	return &OptClassIdentifier{Identifier: string(data[2 : 2+length])}, nil
+}
+
+// Code returns the option code.
+func (o *OptClassIdentifier) Code() OptionCode {
+	return OptionClassIdentifier
+}
+
+// ToBytes returns a serialized stream of bytes for this option.
+func (o *OptClassIdentifier) ToBytes() []byte {
+	return append([]byte{byte(o.Code()), byte(o.Length())}, []byte(o.Identifier)...)
+}
+
+// String returns a human-readable string for this option.
+func (o *OptClassIdentifier) String() string {
+	return fmt.Sprintf("Class Identifier -> %v", o.Identifier)
+}
+
+// Length returns the length of the data portion (excluding option code and byte
+// for length, if any).
+func (o *OptClassIdentifier) Length() int {
+	return len(o.Identifier)
+}