The goal of this project is to take a URL on the command line and downloads the associated file. The implementation includes protocols from Data-link Layer to Application Layer with the basic raw socket. The main work is about building the Ethernet, IP and TCP headers in each packet.
| Ethernet Header | IP Header | TCP Header | HTTP Data | Padding |
|---|---|---|---|---|
| 14 byte | 20 byte | 20 byte or more | add to 64 |