【发布时间】：2018-10-01 03:20:43
【问题描述】：
我正在使用 pexpect 在 cisco 路由器上登录和运行命令。它卡在 RSA 是/否提示上，而不是发送“是”。这是代码的sn-p：
fout = file(filepath,'w')
child = pexpect.spawn('ssh %s@%s' % (username, agg))
child.logfile_read = fout
rsa_key = '\(yes\/no\)\?'
prompt = "Password:"
i = child.expect([rsa_key,prompt,""])
if i==0:
child.sendline('yes')
child.expect(prompt)
child.sendline(password)
elif i==1:
child.sendline(password)
else:
child.sendline(password)
child.expect('>')
child.sendline('enable')
child.expect('Password:')
child.sendline(password)
child.expect('#')
child.sendline('terminal length 0')
child.expect('#')
child.sendline('show processes cpu history')
child.expect('#')
child.sendline('logout')
这是我得到的错误：
Traceback (most recent call last):
File "/usr/pre_check.py", line 378, in <module>
agg_check = agg_checks(agg,username,password)
File "/usr/pre_check.py", line 198, in agg_checks
child.expect('>')
File "/usr/local/lib/python2.7/dist-packages/pexpect/spawnbase.py", line 327, in expect
timeout, searchwindowsize, async_)
File "/usr/local/lib/python2.7/dist-packages/pexpect/spawnbase.py", line 355, in expect_list
return exp.expect_loop(timeout)
File "/usr/local/lib/python2.7/dist-packages/pexpect/expect.py", line 104, in expect_loop
return self.timeout(e)
File "/usr/local/lib/python2.7/dist-packages/pexpect/expect.py", line 68, in timeout
raise TIMEOUT(msg)
pexpect.exceptions.TIMEOUT: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x7f6c5e4b89d0>
command: /usr/bin/ssh
args: ['/usr/bin/ssh', 'username@router']
buffer (last 100 chars): 'TyefPiveH4nHv1dfvbL/MFbqSR+dup1U7Cn+JaDeq0.\r\nAre you sure you want to continue connecting (yes/no)? '
before (last 100 chars): 'TyefPiveH4nHv1dfvbL/MFbqSR+dup1U7Cn+JaDeq0.\r\nAre you sure you want to continue connecting (yes/no)? '
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 28991
child_fd: 7
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: <open file 'mylogfile.txt', mode 'w' at 0x7f6c5e53ee40>
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
0: re.compile(">")
我尝试了不同版本的 rsa_key 变量，但遇到了同样的问题：
- 确定要继续连接（是/否）\？
- 确定要继续连接（是/否）？
- 确定要继续连接
- （是/否）？
- （是/否）\?
- （是/否）
这是 ssh 到交换机时的样子：
ssh username@routername
The authenticity of host 'routername (11.111.111.1)' can't be established.
RSA key fingerprint is SHA256:KCS1HKzltOwHgg+WhTsV3OTxNzxUQwN9T3Jp1lGVu00.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'routername,11.111.111.1' (RSA) to the list of known hosts.
Password:
routername>
【问题讨论】：
-
为什么要给
expect打电话的名单见：pexpect.readthedocs.io/en/stable/api/… -
@Adonis 该链接的第二和第三句：模式超载，可能采用多种类型。该模式可以是 StringType、EOF、已编译的 re 或任何这些类型的列表。 该部分中的大多数示例也将列表传递给
expect()。不过，不确定空字符串的用途是什么。 -
@glibdud 糟糕，我只看了签名... OP 能否提供提示的样子？也许您可以尝试使用像 (".*yes/no.*") 这样的正则表达式？
-
更新了 ssh 登录过程的样子。当 if 语句中有“else”时，需要空字符串。如果出于某种原因我有“else”而没有空字符串，它会中断。