Golang implementation of libssh

With the advent of the cloud computing era, more and more enterprises are adopting cloud computing technology to run applications. Most applications need to communicate through network protocols, and this communication needs to be encrypted to ensure data security. The SSH (Secure Shell) protocol is an encrypted network protocol used to securely transfer data between computers. libssh is an open source SSH client and server-side implementation library that can be used to develop SSH client-side and server-side applications.

This article will introduce the golang implementation of libssh and how to use it to develop SSH client and server-side applications.

1. Golang implementation of libssh

libssh is a low-level SSH protocol implementation library. It provides various functions of the SSH protocol, such as connecting to the SSH server, authenticating users, and starting remote commands. and transfer files, etc. libssh was originally written in C language, but due to golang's efficiency and ease of use, more and more commercial applications are developed in golang. Therefore, in order to facilitate golang developers, the golang implementation of libssh, namely libgossh, was launched.

libgossh is a golang implementation based on libssh 0.7.x version. It provides a series of APIs to easily develop SSH client and server-side applications. Compared with libssh, it is more easy to use, flexible and efficient.

2. How to use libgossh

Before using libgossh, you need to install the libssh library first. In Ubuntu and Debian systems, you can use the following command to install:

sudo apt-get update
sudo apt-get install libssh-dev

In CentOS and Fedora systems, you can use the following command to install:

sudo yum install -y libssh-devel

After installing the libssh library, you can Start using libgossh. Here are some commonly used APIs.

1. Connect to SSH server

To connect to the SSH server, you need to specify the server's IP address and SSH port number. For example:

client, err := gossh.Connect("192.168.0.100", 22)
if err != nil {
    log.Fatal("Failed to connect to SSH server: ", err)
}

2. Authenticated user

After connecting to the SSH server, the user needs to be authenticated. You can use the following API for user authentication:

err = client.Auth(passwordAuth("user", "password"))
if err != nil {
    log.Fatal("Failed to authenticate user: ", err)
}

Among them, passwordAuth is a custom function used to generate user password authentication information.

3. Start the remote command

After connecting to the SSH server and authenticating the user, you can start the remote command. For example:

cmd, err := client.NewCommand("ls -l")
if err != nil {
    log.Fatal("Failed to create new command: ", err)
}

4. Transfer files

In addition to launching remote commands, you can also use libgossh to transfer files. For example:

file, err := os.Open("/local/path/file.txt")
if err != nil {
    log.Fatal("Failed to open local file: ", err)
}
defer file.Close()

remoteFile, err := client.Create("/remote/path/file.txt")
if err != nil {
    log.Fatal("Failed to create remote file: ", err)
}
defer remoteFile.Close()

_, err = io.Copy(remoteFile, file)
if err != nil {
    log.Fatal("Failed to copy local file to remote file: ", err)
}

The above are some common APIs of libgossh, which can easily develop SSH client and server-side applications.

3. Summary

libgossh is the golang implementation of libssh, which provides golang developers with a convenient API to develop SSH client and server-side applications. It is easy to use, flexible and efficient, making it a good choice for enterprises to develop golang applications.

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