Question

我希望在SSH会话中的远程计算机上工作：

登录远程服务器
su
让我的工作

使用我的脚本a可以执行步骤1和2。执行su命令时，我可以发送密码，得到我期待的答案（

on_data: data = gis@v04ree:~>
got gis@v04ree:~>

但是，那我该怎么办？我坐在我的频道上，没有任何反应。如何让频道了解命令已经完成以及我想在远程机器上进行操作？

require 'net/ssh'
require 'net/sftp'

class Connection
  def connect
host = 'host'
user = 'user'

#1. Login
Net::SSH.start(host, user) do |ssh|
  puts ssh.exec!("whoami")
  #2. su
  begin
    puts(su(ssh, "otherUser", "otherPwd"))
  rescue Exception => e
    puts e
  end
  #3. work
  puts "logged in as " << ssh.exec!("whoami")
  ssh.close
end
end

def su(ssh, user, pwd)
 channel = ssh.open_channel do |ch|
  channel.request_pty do |ch, success|
    raise "Could not obtain pty (i.e. an interactive ssh session)" if !success
  end

  command = "su - #{user}\n"
  puts "command = #{command}"
  channel.exec command do |ch, success|
    raise "could not execute command" unless success

    # "on_data" is called when the process writes something to stdout
    ch.on_data do |c, data|
      puts "on_data: data = "+data
      if data == "Password: "
        puts "Password request"
        channel.send_data "#{pwd}\n"
      end
      if data == "gis@v04ree:~> "
        #logged in as gis
        puts "got gis@v04ree:~>"
        #and now? What's next?
        #channel.eof! # <-doesn't work

        ch.exec "ls" do |ch, success| #<- doesn't work either: success is false
          unless success
            puts "alas! the command could not be invoked!"
          end
        end
      end
    end
    #wouldn't be called
    ch.on_extended_data do |c, type, data|
      puts "on_extended_data: data = #{data}"
    end
  end #end su - gis

  #which statement
  ssh.loop
  #channel.wait
end
end
end #class end

Connection.new.connect

Answer 1

问题是su正在创建一个子shell，而net-ssh正在控制最外层的shell。就像运行emacs或来自net-ssh的某些内容一样，您不能指望net-ssh能够知道如何控制内壳。

所以你需要做的就是当你发现su成功时，你必须发送数据就好像你只是输入它一样，然后你就可以阅读标准输出了。遗憾的是，您不能将stdout与stderr分开，因为它位于子shell中，但您仍然可以获得输出。

在成功ch.exec之后，不使用su，而是使用ch.send_data "command\n"并阅读输出。不要忘记用ch.send_data "exit\n"结束所有事情。（请注意，\n必须遵循每个命令来模拟控制台中的回车键

ruby ssh：交互式命令“su”：成功登录后又如何？

1 个答案: