From fdac804dc9375ebe7c607059c186b771d5c49800 Mon Sep 17 00:00:00 2001
From: Owen Mooney <mooneyow@tcd.ie>
Date: Wed, 25 Jul 2018 13:14:11 +0100
Subject: Add TFTP server name option (#92)

---
 dhcpv4/option_tftp_server_name.go | 54 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 dhcpv4/option_tftp_server_name.go

(limited to 'dhcpv4/option_tftp_server_name.go')

diff --git a/dhcpv4/option_tftp_server_name.go b/dhcpv4/option_tftp_server_name.go
new file mode 100644
index 0000000..b4029e1
--- /dev/null
+++ b/dhcpv4/option_tftp_server_name.go
@@ -0,0 +1,54 @@
+package dhcpv4
+
+import (
+	"fmt"
+)
+
+// This option implements the TFTP server name option.
+// https://tools.ietf.org/html/rfc2132
+
+// OptTFTPServerName implements the TFTP server name option.
+type OptTFTPServerName struct {
+	TFTPServerName []byte
+}
+
+// Code returns the option code
+func (op *OptTFTPServerName) Code() OptionCode {
+	return OptionTFTPServerName
+}
+
+// ToBytes serializes the option and returns it as a sequence of bytes
+func (op *OptTFTPServerName) ToBytes() []byte {
+	return append([]byte{byte(op.Code()), byte(op.Length())}, op.TFTPServerName...)
+}
+
+// Length returns the option length in bytes
+func (op *OptTFTPServerName) Length() int {
+	return len(op.TFTPServerName)
+}
+
+func (op *OptTFTPServerName) String() string {
+	return fmt.Sprintf("OptTFTPServerName{TFTPServerName=%s}", op.TFTPServerName)
+}
+
+// ParseOptTFTPServerName returns a new OptTFTPServerName fomr a byte stream or error if any
+func ParseOptTFTPServerName(data []byte) (*OptTFTPServerName, error) {
+	if len(data) < 3 {
+		return nil, ErrShortByteStream
+	}
+	code := OptionCode(data[0])
+	if code != OptionTFTPServerName {
+		return nil, fmt.Errorf("ParseOptTFTPServerName: invalid code: %v; want %v",
+			code, OptionTFTPServerName)
+	}
+	length := int(data[1])
+	if length < 1 {
+		return nil, fmt.Errorf("TFTP server name has invalid length of %d", length)
+	}
+	TFTPServerNameData := data[2:]
+	if len(TFTPServerNameData) < length {
+		return nil, fmt.Errorf("ParseOptTFTPServerName: short data: %d bytes; want %d",
+			len(TFTPServerNameData), length)
+	}
+	return &OptTFTPServerName{TFTPServerName: TFTPServerNameData[:length]}, nil
+}
-- 
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