Michael Stapelberg
52 lines
1.8 KiB
Go
52 lines
1.8 KiB
Go
// Copyright 2018 Google Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dhcp4
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import (
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"net"
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"github.com/google/gopacket/layers"
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)
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// MessageTypeOpt is a short-hand for constructing a MessageType DHCP option.
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func MessageTypeOpt(msgType layers.DHCPMsgType) layers.DHCPOption {
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return layers.NewDHCPOption(layers.DHCPOptMessageType, []byte{byte(msgType)})
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}
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// HostnameOpt is a short-hand for constructing a Hostname DHCP option.
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func HostnameOpt(hostname string) layers.DHCPOption {
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// TODO: limit length
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return layers.NewDHCPOption(layers.DHCPOptHostname, []byte(hostname))
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}
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// ClientIDOpt is a short-hand for constructing a ClientID DHCP option.
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func ClientIDOpt(linkType layers.LinkType, hwaddr net.HardwareAddr) layers.DHCPOption {
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return layers.NewDHCPOption(layers.DHCPOptClientID, append([]byte{byte(linkType)}, hwaddr...))
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}
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// ParamsRequestOpt is a short-hand for constructing a ParamsRequest DHCP option.
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func ParamsRequestOpt(opts ...layers.DHCPOpt) layers.DHCPOption {
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b := make([]byte, len(opts))
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for idx, opt := range opts {
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b[idx] = byte(opt)
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}
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return layers.NewDHCPOption(layers.DHCPOptParamsRequest, b)
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}
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// RequestIPOpt is a short-hand for constructing a RequestIP DHCP option.
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func RequestIPOpt(requestIP net.IP) layers.DHCPOption {
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return layers.NewDHCPOption(layers.DHCPOptRequestIP, []byte(requestIP))
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}
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