• Stars
    star
    135
  • Rank 269,297 (Top 6 %)
  • Language
    C
  • License
    Creative Commons ...
  • Created over 11 years ago
  • Updated 6 months ago

Reviews

There are no reviews yet. Be the first to send feedback to the community and the maintainers!

Repository Details

A very simple and small DNS Server to help understanding the protocol basics.

Introduction

SimpleDNS is a very simple DNS server written in C. It was made to learn the basics of the DNS protocol.

Features:

  • very small
  • single-threaded
  • very simplistic memory management
  • supports A, AAAA and TXT queries
  • no full protection against invalid requests :|

Build

git clone https://github.com/mwarning/SimpleDNS.git
cd SimpleDNS
make

Test

Start SimpleDNS:

$./main
Listening on port 9000.

In another console execute dig to make a DNS request:

$ dig @127.0.0.1 -p 9000 foo.bar.com A

; <<>> DiG 9.8.4-rpz2+rl005.12-P1 <<>> @127.0.0.1 -p 9000 foo.bar.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; -&gt;&gt;HEADER&lt;&lt;- opcode: QUERY, status: NOERROR, id: 15287
;; flags: qr; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;foo.bar.com.                   IN      A

;; ANSWER SECTION:
foo.bar.com.            0       IN      A       192.168.1.1

;; Query time: 0 msec
;; SERVER: 127.0.0.1#9000(127.0.0.1)
;; WHEN: Mon Apr 15 00:50:38 2013
;; MSG SIZE  rcvd: 56

Note:

  • On Debian Linux, dig is part of the dnsutils package.
  • Use AAAA instead of A in the dig command line to request the IPv6 address.

Modify address entries

The code maps the domain foo.bar.com to the IPv4 address 192.168.1.1 and IPv6 address fe80::1. It is easy to find it in the code and to add other entries.

Recommended Reading

The DNS section of the TCP/IP-Guide was very helpful for understanding the protocol.

Similar Projects

More Repositories

1

zerotier-openwrt

A OpenWrt package for ZeroTier One - Pull requests are welcome!
Shell
675
star
2

KadNode

P2P DNS with content key, crypto key and PKI support. DynDNS alternative.
C
408
star
3

openwrt-examples

Examples for creating OpenWrt programs&packages.
Makefile
192
star
4

meshnet-lab

Emulate huge mobile ad-hoc mesh networks using Linux network namespaces.
Python
147
star
5

docker-openwrt-build-env

A Docker container to build OpenWrt images
Dockerfile
139
star
6

trigger

Android app to lock/unlock/ring doors. Supports generic HTTPS/SSH/Bluetooth/MQTT and Nuki Smartlock.
Kotlin
133
star
7

UDP-hole-punching-examples

A small collection of examples for UDP hole punching.
C
104
star
8

chaos-sticker-collection

A collection of chaos event / nerd culture related stickers.
HTML
96
star
9

MeshNetSimulator

A simulator for sketching and testing mesh network routing strategies
Rust
78
star
10

netlink-examples

Linux kernel Netlink examples inspired by "Why and How to Use Netlink Socket"
C
59
star
11

openwrt-firmware-selector

OpenWrt firmware selector. With custom image builder support.
JavaScript
39
star
12

device-observatory

Discover what your phone does on the Internet.
C
31
star
13

SimpleOctree

A simple and very fast Octree Implementation that supports Nearest Neigbour Search
C++
28
star
14

libsodium-example

A simple example on how to use the libsodium crypto library
C
20
star
15

testmesh

A collection of mesh routing protocols.
C
17
star
16

MeshGraphViewer

Visualize mesh graphs as forcegraph and on OpenStreetMap
JavaScript
16
star
17

dhtd

Utilize the BitTorrent network for hash identifier storage and lookup
C
15
star
18

p2p-gui

A remote web interface for MLdonkey, aMule, rTorrent, Transmission and giFT.
D
14
star
19

mtdRW

A small Linux kernel module that makes all MTD partitions writeable at runtime.
C
12
star
20

mbedtls_ecp_compression

Elliptic Curve Point compression/decompression for mbedtls
C
11
star
21

dat-c

A hobby implementation of the dat protocol in C
C
9
star
22

libsodium-openwrt

libsodium package for OpenWrt
Makefile
6
star
23

web-torrent

Experimental web browser with P2P capabilities
Python
4
star
24

guest-counter

A shell script to count active devices on the local network.
Shell
3
star
25

monty-hall-problem

Monty Hall Problem in Python
Python
2
star
26

mwarning.de

My Website :-)
JavaScript
1
star
27

plain-prpl

A simplistic protocol plugin for Pidgin / libpurple
C
1
star
28

titanion

Titanion is a classic 2.5D shooter game.
Rust
1
star
29

PyQt4-Examples

Some Qt4 examples translated to PyQt4/Python
Python
1
star
30

shell_copy_progress

A simple wrapper around the cp command to show the progress.
Shell
1
star
31

openwrt-autoconnect

A small openwrt script/package to connect to an SSID from a configured list
Shell
1
star
32

Hyperbolic-Graph-Generator

A Rust port of https://github.com/named-data/Hyperbolic-Graph-Generator
Rust
1
star