Question

我正在使用pxssh进行简单的ssh登录。关注T.J.来自Cookbook的Connor脚本。

我可以使用pxssh成功进入远程计算机，并在尝试使用python解释器时传递命令。以下是观点。

>>> from pexpect import pxssh
>>> s = pxssh.pxssh()
>>> s.login("192.168.1.107", "shineesh", "password123")
True
>>> s
<pexpect.pxssh.pxssh object at 0xb72d772c>
>>> s.sendline("ifconfig")
9
>>> s.prompt()
True
>>> print s.before
ifconfig
eth0      Link encap:Ethernet  HWaddr 3X:XX:XX:XX:XX:X4  
      UP BROADCAST MULTICAST  MTU:1500  Metric:1
      RX packets:0 errors:0 dropped:0 overruns:0 frame:0
      TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
      collisions:0 txqueuelen:1000 
      RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

现在当我再次尝试同样的事情时，我得到了这个

>>> s = pxssh.pxssh()
>>> s.login("192.168.1.107", "shineesh", "password123")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/pexpect/pxssh.py", line 331, in login
if not self.sync_original_prompt(sync_multiplier):
File "/usr/lib/python2.7/dist-packages/pexpect/pxssh.py", line 218, in sync_original_prompt
b = self.try_read_prompt(sync_multiplier)
File "/usr/lib/python2.7/dist-packages/pexpect/pxssh.py", line 182, in try_read_prompt
prompt += self.read_nonblocking(size=1, timeout=timeout)
File "/usr/lib/python2.7/dist-packages/pexpect/pty_spawn.py", line 455, in read_nonblocking
return super(spawn, self).read_nonblocking(size)
File "/usr/lib/python2.7/dist-packages/pexpect/spawnbase.py", line 149, in read_nonblocking
raise EOF('End Of File (EOF). Exception style platform.')
pexpect.exceptions.EOF: End Of File (EOF). Exception style platform.
>>>

下面的脚本也会抛出EOF异常

#! /usr/bin/python -tt
from pexpect import pxssh
import pexpect

def send_commands(s, command):
    s.sendline(command)
    s.prompt(pexpect.EOF)
    print s.before
def connect(host, username, password):
    try:
            child = pxssh.pxssh()
            child.login(host, username, password)
            return child
    except Exception, e:
            print "[-] Error Connecting\n" +  str(e)
            exit(0)

def main():

    s = connect('192.168.1.107', 'shineesh', 'password123')
    send_commands(s, 'ifconfig')

if __name__ == '__main__':
    main()

-----输出--------------

[-] Error Connecting
End Of File (EOF). Exception style platform.

再次跟随

中的几个线程/引用

http://stackoverflow.com/questions/24919980/pxssh-throwing-end-of-file-eof-exception-style-platform-exception
http://pexpect.sourceforge.net/doc/

----------新剧本--------------

#! /usr/bin/python -tt
from pexpect import pxssh
import pexpect

def send_commands(s, command):
    s.sendline(command)
    s.prompt(pexpect.EOF)
    print s.before
def connect(host, username, password):
    try:
            child = pxssh.pxssh()
            child.login(host, username, password)
            child.expect(pexpect.EOF, timeout=None)
            return child
    except Exception, e:
            print "[-] Error Connecting\n" +  str(e)
            exit(0)

def main():

    s = connect('192.168.1.107', 'shineesh', 'password123')
    send_commands(s, 'ls -all')

if __name__ == '__main__':
    main()

-------输出-------------

[-] Error Connecting
End Of File (EOF). Exception style platform.

我在哪里错了？

Answer 1

经过大量的例子/文章后，终于想出了什么阻止了pxssh成功登录SSH。

来自pxssh的connect（）方法接受＆＃34; login_timeout = 10＆＃34;默认情况下。在这里，SSH登录远程计算机的时间超过10秒，因此login（）引发了ExceptionPxssh异常。该例外具有误导性，因为它说＆＃34; pexpect.exceptions.EOF：文件结束（EOF）。异常风格平台。＆＃34;

无论如何设置login_timeout = 15，pxssh脚本都会通过。以下是解决方案代码。

#! /usr/bin/python -tt
from pexpect import pxssh

def send_commands(s, command):
    s.sendline(command)
    s.prompt()
    print s.before
def connect(host, username, password):
    try:
            child = pxssh.pxssh()
            child.login(host, username, password, login_timeout=15)
            return child
    except pxssh.ExceptionPxssh, e:
            print "[-] Error Connecting\n" +  str(e)
            exit(0)
def main():

    s = connect('192.168.1.107', 'shineesh', 'password123')
    send_commands(s, 'ifconfig')

if __name__ == '__main__':
    main()

卡住了pxssh。首次成功登录后，它无法再次登录？

1 个答案: