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Sending Specific Character String Response with SSH Client using PuTTY

In some cases, you might need to send a specific character string response when using an SSH client like PuTTY. This article will guide you on how to configure PuTTY to send a specific character string response.

Understanding the Issue

By default, when you connect to a remote server using an SSH client like PuTTY, it sends a login banner and waits for your input. However, in some cases, you might want to automate this process and send a specific character string response instead of manually typing it.

Configuring PuTTY to Send Specific Character String Response

To configure PuTTY to send a specific character string response, follow these steps:

1. Open PuTTY and enter the hostname or IP address of the remote server in the Host Name (or IP address) field.

2. Click on the Connection category in the left-hand pane, then select SSH and finally Tunnels. In the Source port field, enter a local port number (e.g., 8022). Click on the Add button.

3. Still under the Connection category, select Data and then Auto-login username. Enter your username in the field provided.

4. Click on the Session category in the left-hand pane. In the Saved Sessions field, enter a name for this session. Click on the Save button to save the session.

5. Click on the Session category again. Click on the Open button to open the session.

6. After the login prompt appears, press Enter to start the login process. At this point, PuTTY will send your username.

7. To send a specific character string response, you'll need to use a script or a tool that can send keystrokes after the login prompt. For example, you can use AutoHotkey on Windows or expect on Linux/macOS.

Here's a simple example using AutoHotkey:

#NoEnv
Send, your_specific_string^E
Sleep, 1000
Send, {Enter}

Save this script with a .ahk extension and run it after opening the PuTTY session. The ^E sends the ^E sequence, which is the escape character followed by the letter 'E'. This is the configuration option that tells the SSH client to send a specific character string response.

References

• PuTTY Configuration Guide
• SSH Authentication with PuTTY
• AutoHotkey Scripting Language Documentation
• Expect - Tcl Network Programming