代写ECE4016、Python设计编程代做

日期：2024-10-10 11:42

ECE4016 Assignment 1

In this assignment, you are required to implement a simple Local DNS Server .

Introduction

The Domain Name System (DNS) is the hierarchical and decentralized naming system used to

identify computers reachable through the Internet or other Internet Protocol (IP) networks. The

resource records contained in the DNS associate domain names with other forms of information.

These are most commonly used to map human-friendly domain names to the numerical IP

addresses computers need to locate services and devices using the underlying network

protocols, but have been extended over time to perform many other functions as well. The

Domain Name System has been an essential component of the functionality of the Internet since

1985. (wikipedia)

Iterative query and Recursive query

Detailed grading rule

The local DNS server should have the following function:Listen and accept the DNS queries

Send response to the clients

Maintain a cache(20 points). If the ip address is queried before, it should be stored in the

cache. if the answer for the query is found in cache, Local DNS Server send this answer to

Client as the DNS response

Support the DNS queries of www.baidu.com through recursive or iterative searching (30

points)

Support the DNS queries of www.example.com through recursive or iterative searching (20

points)

Support the DNS queries of www.baidu.com through public DNS server (15 points)

Support the DNS queries of www.example.com through public DNS server (15 points)

Requirements

Print the ip address of all the servers you pass by during the searching

Use a variable flag to indicate whether ask the public server for the IP address. When the

flag is set to be 0 , ask the public server for the IP address. When the flag is set to be 1 do

the recursive or iterative searching

Make sure your program works under ubuntu 20

Show how to execute your code

The programming language should be Python(version 3.9)

Dnspython is not allowed to use in this lab

The server is required to work on port 1234 of 127.0.0.1

Useful tools

There are some useful tools that may help you in your programming. (Dnspython is not allowed

to use in this lab)

socket

dnslibSimple test by yourself

You can use dig to test your local NDS server.

An example test code:

dig www.example.com @127.0.0.1 -p 1234

dig www.baidu.com @127.0.0.1 -p 1234

Note that this test code will be used in the evaluation of this project, make sure your program

works given this test code.

Submission

Due on 23:59, 13 Oct 2024(Late submission within 5 minitues is allowed without

punishment)

Every 24h late delivery will be deducted 10%, and 48h late delivery will be allowed at most.

After 48h, 0 marks will be given for this assignment

Honesty

We take your honesty seriously. If you are caught copying others' code, you will get an

automatic 0 in this project. Please write your own code.