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Diffstat (limited to 'dhcpv4/option_server_identifier.go')
-rw-r--r--dhcpv4/option_server_identifier.go56
1 files changed, 56 insertions, 0 deletions
diff --git a/dhcpv4/option_server_identifier.go b/dhcpv4/option_server_identifier.go
new file mode 100644
index 0000000..26c21a7
--- /dev/null
+++ b/dhcpv4/option_server_identifier.go
@@ -0,0 +1,56 @@
+package dhcpv4
+
+import (
+ "fmt"
+ "net"
+)
+
+// This option implements the server identifier option
+// https://tools.ietf.org/html/rfc2132
+
+// OptServerIdentifier represents an option encapsulating the server identifier.
+type OptServerIdentifier struct {
+ ServerID net.IP
+}
+
+// ParseOptServerIdentifier returns a new OptServerIdentifier from a byte
+// stream, or error if any.
+func ParseOptServerIdentifier(data []byte) (*OptServerIdentifier, error) {
+ if len(data) < 2 {
+ return nil, ErrShortByteStream
+ }
+ code := OptionCode(data[0])
+ if code != OptionServerIdentifier {
+ return nil, fmt.Errorf("expected code %v, got %v", OptionServerIdentifier, code)
+ }
+ length := int(data[1])
+ if length != 4 {
+ return nil, fmt.Errorf("unexepcted length: expected 4, got %v", length)
+ }
+ if len(data) < 6 {
+ return nil, ErrShortByteStream
+ }
+ return &OptServerIdentifier{ServerID: net.IP(data[2 : 2+length])}, nil
+}
+
+// Code returns the option code.
+func (o *OptServerIdentifier) Code() OptionCode {
+ return OptionServerIdentifier
+}
+
+// ToBytes returns a serialized stream of bytes for this option.
+func (o *OptServerIdentifier) ToBytes() []byte {
+ ret := []byte{byte(o.Code()), byte(o.Length())}
+ return append(ret, o.ServerID.To4()...)
+}
+
+// String returns a human-readable string.
+func (o *OptServerIdentifier) String() string {
+ return fmt.Sprintf("Server Identifier -> %v", o.ServerID.String())
+}
+
+// Length returns the length of the data portion (excluding option code an byte
+// length).
+func (o *OptServerIdentifier) Length() int {
+ return len(o.ServerID.To4())
+}