https://github.com/dechristopher/dhcp-client

Reference DHCP client in go
https://github.com/dechristopher/dhcp-client

client dhcp golang reference

Last synced: 23 days ago
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Reference DHCP client in go

• Host: GitHub
• URL: https://github.com/dechristopher/dhcp-client
• Owner: dechristopher
• License: unlicense
• Created: 2020-04-09T00:28:45.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2020-09-10T12:26:34.000Z (about 4 years ago)
• Last Synced: 2024-06-20T03:29:17.036Z (5 months ago)
• Topics: client, dhcp, golang, reference
• Language: Go
• Homepage:
• Size: 432 KB
• Stars: 8
• Watchers: 3
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Golang DHCP Client Demonstration

A toy golang DHCP client to explore the DHCP protocol.

Randomizes request MAC address as to not step on the same lease over and over.

## Usage

```bash

./compile.sh

./toydhcp [-ip4 address]

```

## Outline

- [DHCP Protocol Diagram](#dhcp-protocol-diagram)

- [DHCP Packet Sequence](#dhcp-packet-sequence)

    1. [DISCOVER](#discover)

    2. [OFFER](#offer)

    3. [REQUEST](#request)

    4. [(N)ACKNOWLEDGE](#nacknowledge)

- [DHCP Option Codes](#dhcp-option-codes)

- [Additional Reading](#additional-reading)

## DHCP Protocol Diagram

![flow](img/flow.png)  

Wikipedia - Gelmo96 / CC BY-SA (https://creativecommons.org/licenses/by-sa/4.0)

## DHCP Packet Sequence

#### DISCOVER

![discover](img/discover.png)

#### OFFER

![offer](img/offer.png)

#### REQUEST

![request](img/request.png)

#### (N)ACKNOWLEDGE

![acknowledge](img/ack.png)

## DHCP Option Codes

A small selection of important DHCP Option Codes

- *53* - DHCP Message Type (1B) - Indicates the specific type of DHCP message: DISCOVER(1), OFFER(2), REQUEST(3), DECLINE(4), ACK(5), NACK(6), RELEASE(7), INFORM(8)

- *50* - Requested IP Address (4B)

- *54* - DHCP Server Address (4B)

- *51* - Lease Time in Seconds (4B)

- *3* - Router IP Address (4B)

- *1* - Network Subnet Mask (4B)

- *255* - End Mark (1B)

## Additional Reading

[Wikipedia.org - DHCP](https://en.wikipedia.org/wiki/Dynamic_Host_Configuration_Protocol)   

[The TCP/IP Guide - DHCP Options](http://www.tcpipguide.com/free/t_SummaryOfDHCPOptionsBOOTPVendorInformationFields-2.htm)