ssh2.cr

This library provides binding for libssh2 library.

Requirements

• Crystal language version 0.7.0 and higher.
• libssh2 version 1.5.0 or higher

You can use homebrew to install the latest libssh2:

$ brew install libssh2

Goal

The goal is to utilize libssh2 API by providing services like ability to run shell commands via ssh as well as scp and sftp services.

Usage

An example of running a shell command via SSH on the remote server:

require "ssh2"

SSH2::Session.open("my_server") do |session|
  session.login("username", "password")
  session.open_session do |channel|
    channel.command("uptime")
    IO.copy(channel, STDOUT)
  end
end

An example of running shell:

require "ssh2"

session = SSH2::Session.open("localhost", 2222)
session.login("root", "somepassword")
channel = session.open_session

# request the terminal has echo mode off
channel.request_pty("vt100", [{SSH2::TerminalMode::ECHO, 0u32}])
channel.shell

# Send commands
spawn {
  list = ["ls\n", "ps aux\n", "uptime\n"]
  loop do
    channel.write(list.sample(1)[0].to_slice)
    sleep 3
  end
}

# Receive responses
raw_data = Bytes.new(2048)
loop do
  bytes_read = channel.read(raw_data)
  puts String.new(raw_data[0, bytes_read])
end

An example of using SFTP API:

require "ssh2"

SSH2::Session.open("localhost", 2222) do |session|
  # NOTE:: ED25519 based keys only work on latest versions of libssh2
  session.login_with_pubkey("root", "./spec/keys/id_rsa", "./spec/keys/id_rsa.pub")
  session.sftp_session do |sftp|
    sftp.open_dir(".").ll do |fn|
      puts fn
    end
    file = sftp.open(".bashrc")
    puts file.gets_to_end
  end
end

Testing

In order to run test suite you need to pull and run the following docker container:

$ docker pull tutum/ubuntu:trusty
$ docker run -d -p 2222:22 -e AUTHORIZED_KEYS="`cat ./spec/keys/id_rsa.pub`" tutum/ubuntu:trusty

License

MIT clause - see LICENSE for more details. Many thanks to the original author Kent Sibilev