使用 pexpect 和 pxssh 时的 EOF [英] EOF when using pexpect and pxssh
问题描述
我正在尝试在 暴力蟒蛇.同时使用 child.expect() 和 pxssh 我得到了类似的 EOF 错误.
I'm trying to run the code in the Interacting with SSH Through Pexpect and Brute Forcing SSH Passwords with Pxssh sections from Chapter 2 of Violent Python. Using both child.expect() and pxssh I get similar EOF errors.
从 Python 控制台运行这些命令:
Running these commands from the Python console:
import pexpect
connStr = "ssh root@127.0.0.1"
child = pexpect.spawn(connStr)
ret = child.expect([pexpect.TIMEOUT, ssh_newkey, "[P|p]assword:"])
我得到这个输出:
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1316, in expect
return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1330, in expect_list
return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1401, in expect_loop
raise EOF (str(e) + '\n' + str(self))
EOF: End Of File (EOF) in read_nonblocking(). Empty string style platform.
<pexpect.spawn object at 0x10180c550>
version: 2.4 ($Revision: 516 $)
command: /usr/bin/ssh
args: ['/usr/bin/ssh', 'root@127.0.0.1']
searcher: searcher_re:
0: TIMEOUT
1: re.compile("Are you sure you want to continue connecting")
2: re.compile("[P|p]assword:")
buffer (last 100 chars):
before (last 100 chars):
after: <class 'pexpect.EOF'>
match: None
match_index: None
exitstatus: 255
flag_eof: True
pid: 12122
child_fd: 4
closed: False
timeout: 30
delimiter: <class 'pexpect.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
并使用 pxssh 运行这些命令:
And running these commands, using pxssh:
import pxssh
s = pxssh.pxssh()
s.login("127.0.0.1", "root", "1234")
我得到这个输出:
Traceback (most recent call last):
File "<input>", line 1, in <module>
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pxssh.py", line
196, in login
i = self.expect(["(?i)are you sure you want to continue connecting", original_prompt, "(?i)(?:pas
sword)|(?:passphrase for key)", "(?i)permission denied", "(?i)terminal type", TIMEOUT, "(?i)connectio
n closed by remote host"], timeout=login_timeout)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1316, in expect
return self.expect_list(compiled_pattern_list, timeout, searchwindowsize)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1330, in expect_list
return self.expect_loop(searcher_re(pattern_list), timeout, searchwindowsize)
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pexpect.py", li
ne 1401, in expect_loop
raise EOF (str(e) + '\n' + str(self))
EOF: End Of File (EOF) in read_nonblocking(). Empty string style platform.
<pxssh.pxssh object at 0x1016bff90>
version: 2.4 ($Revision: 516 $)
command: /usr/bin/ssh
args: ['/usr/bin/ssh', '-q', '-l', 'root', '127.0.0.1']
searcher: searcher_re:
0: re.compile("(?i)are you sure you want to continue connecting")
1: re.compile("[#$]")
2: re.compile("(?i)(?:password)|(?:passphrase for key)")
3: re.compile("(?i)permission denied")
4: re.compile("(?i)terminal type")
5: TIMEOUT
6: re.compile("(?i)connection closed by remote host")
buffer (last 100 chars):
before (last 100 chars):
after: <class 'pexpect.EOF'>
match: None
match_index: None
exitstatus: None
flag_eof: True
pid: 12136
child_fd: 3
closed: False
timeout: 30
delimiter: <class 'pexpect.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
当我用其他主机替换 127.0.0.1 并尝试不同的用户名/密码组合时，我得到了类似的结果.
I get similar results when I substitute 127.0.0.1 with other hosts and try different username/password combinations.
pexpect 文档 建议使用 expect(pexpect.EOF)避免产生 EOF 异常.确实，当我执行以下操作时:
The pexpect documentation suggests using expect(pexpect.EOF) to avoid generating the EOF exception. Indeed, when I do the following:
connStr = "ssh root@127.0.0.1"
child = pexpect.spawn(connStr)
print child.expect(pexpect.EOF)
结果是0.
但以下问题仍然存在:
- 我对这本书的语法感到困惑:
child.expect([pexpect.TIMEOUT, ssh_newkey, "[P|p]assword:"]).为什么我们要向expect()传递一个列表?这个列表应该包含什么? - 在使用 pxssh 时，我如何使用
expect(pexpect.EOF)，如文档所述? - 为什么书中的代码运行不正常?本书出版后，pexpect 图书馆有什么变化吗?是因为我使用的是 OS X 吗?
- I'm confused by the book's syntax:
child.expect([pexpect.TIMEOUT, ssh_newkey, "[P|p]assword:"]). Why are we passing a list toexpect()? What is this list supposed to contain? - How do I make use of
expect(pexpect.EOF), as the documentation instructs, when using pxssh? - Why does the code in the book not work properly? Has something changed in the pexpect library since the book's publication? Is it because I am on OS X?
我在 Mac OS X 10.8.4 上运行 Python 2.7 和 pexpect 2.4.
I have Python 2.7 and pexpect 2.4 running on Mac OS X 10.8.4.
推荐答案
关于 #2:期待 EOF 在这里是一个红鲱鱼.您-不- 期望登录时出现EOF，您期望登录时出现密码提示.当 pxssh 在没有密码提示的情况下从 ssh 登录时返回 EOF 时，会触发该错误.之所以会发生这种情况，是因为它使用 ssh -q 没有收到警告，而您却收到了来自 ssh 的警告.使用它正在使用的 ssh 选项并在没有 q 的情况下自己运行它们:
Regarding #2: Expecting EOF is a red herring here. You -don't- expect EOF on login, you expect a password prompt on login. pxssh kicks that error when it gets back EOF on login from ssh without getting a password prompt. This can happen because it's using ssh -q to not get warnings, and you're getting a warning from ssh. Take the ssh options it is using and run them yourself without the q:
/usr/bin/ssh -l root 127.0.0.1
/usr/bin/ssh -l root 127.0.0.1
就我而言，当 ssh 由于我连接到的机器的身份已更改而踢出已知的主机违规时，我会收到此错误消息.
In my case, I can get this error message when ssh is kicking out a known hosts violation due to the machine I am connecting to having its identity changed.
这篇关于使用 pexpect 和 pxssh 时的 EOF的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
