python-pexpect_02ssh

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#!/usr/bin/env python

"""
This runs a command on a remote host using SSH. At the prompts enter hostname,
user, password and the command.
"""

import pexpect
import getpass, os

#user: ssh 主机的用户名
#host:ssh 主机的域名
#password:ssh 主机的密码
#command:即将在远端 ssh 主机上运行的命令
def ssh_command (user, host, password, command):
    """
    This runs a command on the remote host. This could also be done with the
    pxssh class, but this demonstrates what that class does at a simpler level.
    This returns a pexpect.spawn object. This handles the case when you try to
    connect to a new host and ssh asks you if you want to accept the public key
    fingerprint and continue connecting.
    """
    ssh_newkey = Are you sure you want to continue connecting
    # 为 ssh 命令生成一个 spawn 类的子程序对象.
    child = pexpect.spawn(ssh -l %s %s %s%(user, host, command))
    i = child.expect([pexpect.TIMEOUT, ssh_newkey, password: ])
    # 如果登录超时,打印出错信息,并退出.
    if i == 0: # Timeout
        print ERROR!
        print SSH could not login. Here is what SSH said:
        print child.before, child.after
        return None
    # 如果 ssh 没有 public key,接受它.
    if i == 1: # SSH does not have the public key. Just accept it.
        child.sendline (yes)
        child.expect (password: )
        i = child.expect([pexpect.TIMEOUT, password: ])
        if i == 0: # Timeout
            print ERROR!
            print SSH could not login. Here is what SSH said:
            print child.before, child.after
        return None
    # 输入密码.
    child.sendline(password)
    return child

def main ():
    # 获得用户指定 ssh 主机域名.
    host = raw_input(Hostname: )
    # 获得用户指定 ssh 主机用户名.
    user = raw_input(User: )
    # 获得用户指定 ssh 主机密码.
    password = getpass.getpass()
    # 获得用户指定 ssh 主机上即将运行的命令.
    command = raw_input(Enter the command: )
    child = ssh_command (user, host, password, command)
    # 匹配 pexpect.EOF
    child.expect(pexpect.EOF)
    # 输出命令结果.
    print child.before

if __name__ == __main__:
    try:
        main()
    except Exception, e:
        print str(e)
        traceback.print_exc()
        os._exit(1)

 

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