DHCP



NodeJS implementation of DHCP socket connection

Install

``
npm install @network-utils/dhcp
`

Declarations

Module has got TypeScript declarations. It can be helpful to understand the module API

See declarations

Examples

$3

`javascript
"use strict";
let { BOOTMessageType, Server } = require("@network-utils/dhcp");

let s = new Server("192.168.1.1");

s.on("listening", () => {
console.log("Server start", s.address);
});

s.on("dhcp", e => {
console.log(e.packet.toString());
});

s.bind();
`

$3

`javascript
"use strict";
let { BOOTMessageType, Server } = require("@network-utils/dhcp");

let s = new Server({
serverId: "192.168.1.1",
gateways: ["192.168.1.1"],
domainServer: ["192.168.1.1"],
});

s.on("listening", () => {
console.log("Server start", s.address);
});

let ips = {};

s.on("discover", e => {
console.log("DISCOVER");

let pkt = e.packet;

// Get IP by MAC
let ip = "0.0.0.0";
if (pkt.op === BOOTMessageType.request) {
if (!(pkt.chaddr in ips))
ip = ips[pkt.chaddr] = 192.168.1.${Object.keys(ips).length + 2};
else
ip = ips[pkt.chaddr];
}

let offer = s.createOffer(pkt);

offer.yiaddr = ip;

s.send(offer);
});
s.on("request", e => {
console.log("REQUEST");
let ack = s.createAck(e.packet);

ack.yiaddr = ips[e.packet.chaddr];

s.send(ack);
});
s.on("release", e => {
console.log("RELEASE");
delete ips[e.packet.chaddr];
});

s.bind();
``

RFC

- Dynamic Host Configuration Protocol
- DHCP Options and BOOTP Vendor Extensions

RELATED

- dhcpjs
- node-dhcpd
- forge