-
Notifications
You must be signed in to change notification settings - Fork 1
/
constructopts.go
51 lines (43 loc) · 1.83 KB
/
constructopts.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dhcp4
import (
"net"
"github.com/google/gopacket/layers"
)
// MessageTypeOpt is a short-hand for constructing a MessageType DHCP option.
func MessageTypeOpt(msgType layers.DHCPMsgType) layers.DHCPOption {
return layers.NewDHCPOption(layers.DHCPOptMessageType, []byte{byte(msgType)})
}
// HostnameOpt is a short-hand for constructing a Hostname DHCP option.
func HostnameOpt(hostname string) layers.DHCPOption {
// TODO: limit length
return layers.NewDHCPOption(layers.DHCPOptHostname, []byte(hostname))
}
// ClientIDOpt is a short-hand for constructing a ClientID DHCP option.
func ClientIDOpt(linkType layers.LinkType, hwaddr net.HardwareAddr) layers.DHCPOption {
return layers.NewDHCPOption(layers.DHCPOptClientID, append([]byte{byte(linkType)}, hwaddr...))
}
// ParamsRequestOpt is a short-hand for constructing a ParamsRequest DHCP option.
func ParamsRequestOpt(opts ...layers.DHCPOpt) layers.DHCPOption {
b := make([]byte, len(opts))
for idx, opt := range opts {
b[idx] = byte(opt)
}
return layers.NewDHCPOption(layers.DHCPOptParamsRequest, b)
}
// RequestIPOpt is a short-hand for constructing a RequestIP DHCP option.
func RequestIPOpt(requestIP net.IP) layers.DHCPOption {
return layers.NewDHCPOption(layers.DHCPOptRequestIP, []byte(requestIP))
}