https://github.com/basemax/ssl-file-downloader-c
A simple C program that downloads files over HTTPS using OpenSSL, with support for SSL/TLS connections.
https://github.com/basemax/ssl-file-downloader-c
c c-language clang download-file file-download https openssl socket
Last synced: 7 months ago
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A simple C program that downloads files over HTTPS using OpenSSL, with support for SSL/TLS connections.
- Host: GitHub
- URL: https://github.com/basemax/ssl-file-downloader-c
- Owner: BaseMax
- License: gpl-3.0
- Created: 2024-09-04T11:31:27.000Z (about 1 year ago)
- Default Branch: main
- Last Pushed: 2024-09-04T11:37:18.000Z (about 1 year ago)
- Last Synced: 2025-03-10T15:11:52.414Z (7 months ago)
- Topics: c, c-language, clang, download-file, file-download, https, openssl, socket
- Language: C
- Homepage:
- Size: 20.5 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# SSL File Downloader in C
This project is a simple SSL file downloader written in C. The program connects to a remote server over HTTPS, sends an HTTP GET request, and downloads the specified file. The downloaded file is saved locally as downloaded_file.txt.
The project utilizes OpenSSL for handling the SSL/TLS connections and includes basic error handling for networking and SSL-related operations.
## Features
- Connects to an HTTPS server using SSL/TLS.
- Sends a GET request to download a file.
- Parses the HTTP response to skip the headers.
- Saves the file content to a local file named downloaded_file.txt.
## Prerequisites
To build and run this project, you'll need:
- GCC (or any C compiler)
- OpenSSL library
## Building the Project
To compile the code, run the following command:
```bash
gcc -o ssl-file-downloader ssl-file-downloader.c -lssl -lcrypto
```
This will produce an executable named ssl-file-downloader.
## Running the Program
Once compiled, you can run the program using:
```bash
./ssl-file-downloader
```
This will download the file from the specified URL (`https://raw.githubusercontent.com/SalamLang/Salam/main/src/array.c`) and save it as `downloaded_file.txt` in the current directory.
## Installing OpenSSL (Linux)
If OpenSSL is not installed, you can install it using the following command:
```bash
sudo apt-get install libssl-dev
```
## Code Explanation
- SSL Initialization: The program initializes the OpenSSL library and sets up an SSL context using the TLS_client_method() function.
- Socket Setup: The program resolves the hostname using getaddrinfo() and establishes a connection to the server using socket() and connect().
- SSL Connection: An SSL object is created and associated with the socket file descriptor using SSL_set_fd(). The program then performs an SSL handshake using SSL_connect().
- HTTP Request and Response Handling: The program sends a GET request to the server and reads the response. It searches for the end of the HTTP headers and begins writing the file content to downloaded_file.txt.
- Cleanup: After the download is complete, the program releases all resources, including closing the file, the SSL connection, and the socket.
## Important Notes
- Hardcoded URL: The hostname and file path are currently hardcoded in the source code. Modify these variables to download different files.
- File Output: The downloaded file is saved as downloaded_file.txt. Ensure that the program has write permissions in the directory where it is executed.
### License
This project is licensed under the GPL-3.0 License. See the LICENSE file for more details.
### Author
Max Base
### Contributions
Contributions, issues, and feature requests are welcome! Feel free to check the issues page if you have any questions or suggestions.
Copyright 2024, Max Base