Overview
This command is a debug build of `wget`, specifically designed to output detailed information during SSL/TLS communication, aiding in problem-solving. It shares the same usage as the standard `wget`, but provides much richer SSL-related diagnostic information when the `--debug` option is used.
Key Features
- Outputs detailed SSL/TLS handshake and certificate information
- Facilitates diagnosis and root cause analysis of HTTPS connection issues
- Supports all download functionalities of standard `wget`
- Useful in development and testing environments
Key Options
`wget-ssl-debug` supports all options of the regular `wget`, and provides richer information particularly when using debugging-related options.
Debug and Output Control
Download Control
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Description:
`wget-ssl-debug` Executes the command.
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Usage Examples
Demonstrates various ways to download files with SSL/TLS debugging information using the wget-ssl-debug command.
Basic SSL Debug Download
wget-ssl-debug --debug https://www.example.com/index.htmlDownloads a file from a specified URL while outputting detailed SSL/TLS debug information.
Debug Download Ignoring Certificate Check
wget-ssl-debug --debug --no-check-certificate https://self-signed.badssl.com/Useful when downloading from servers with invalid or self-signed certificates. Exercise caution regarding security.
Saving Debug Output to a File
wget-ssl-debug --debug https://www.example.com/file.zip 2>&1 | tee wget_debug.logIf the debug output is extensive, you can redirect standard error (stderr) to standard output (stdout) and save it to a file.
Saving File to a Specific Directory
wget-ssl-debug --debug -P /tmp/downloads https://www.example.com/data.jsonDownloads a file to a specified directory while outputting debug information.
Installation
`wget-ssl-debug` is not typically included by default in most Linux distributions. It is a special build version usually obtained by compiling the `wget` source code with specific debugging options. Therefore, you may need to compile it yourself or find a package provided by a specific developer repository.
Standard wget Installation (Reference)
Most systems have the standard `wget` installed. If you need `wget-ssl-debug`, you can check if `wget` is installed with the following commands and install it if it's not.
Debian/Ubuntu
sudo apt update && sudo apt install wgetCentOS/RHEL/Fedora
sudo yum install wgetHow to Obtain wget-ssl-debug
`wget-ssl-debug` can primarily be obtained by downloading the `wget` source code and compiling it with SSL-related debugging options enabled, such as `--enable-debug` or `--with-ssl=openssl`. For precise compilation instructions, refer to the `INSTALL` or `README` files in the `wget` source code. It might also be included in developer tool packages for specific distributions.
Tips & Precautions
Tips and precautions for effectively using wget-ssl-debug.
Interpreting Debug Output
The output from the `--debug` option can be very extensive. It's advisable to filter the necessary information using `grep` with specific keywords (e.g., 'SSL', 'certificate', 'handshake') or view it page by page using the `less` command.
- Filter specific information with grep: `wget-ssl-debug --debug <URL> 2>&1 | grep 'SSL'`
- View page by page with less: `wget-ssl-debug --debug <URL> 2>&1 | less`
Security Warning: --no-check-certificate
The `--no-check-certificate` option bypasses server certificate validation, making you vulnerable to Man-in-the-Middle attacks. This option should strictly be used for development and debugging purposes only and never in production environments.
Saving Log Files
Saving the debug output to a file for later analysis is useful. You can use `2>&1 | tee logfile.log` to redirect both standard output and standard error to a file simultaneously.