我想编写一个程序(在Windows 7上的Python 3.x中),它通过ssh在远程shell上执行多个命令。看完paramikos' exec_command()
函数,我意识到它不适合我的用例(因为在执行命令后通道关闭),因为命令依赖于环境变量(由先前命令设置)并且可以&#39 ; t被连接成一个exec_command()
调用,因为它们将在程序中的不同时间执行。
因此,我想在同一个频道中执行命令。我研究的下一个选项是使用paramikos'来实现交互式shell。 invoke_shell()
功能:
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(host, username=user, password=psw, port=22)
channel = ssh.invoke_shell()
out = channel.recv(9999)
channel.send('cd mivne_final\n')
channel.send('ls\n')
while not channel.recv_ready():
time.sleep(3)
out = channel.recv(9999)
print(out.decode("ascii"))
channel.send('cd ..\n')
channel.send('cd or_fail\n')
channel.send('ls\n')
while not channel.recv_ready():
time.sleep(3)
out = channel.recv(9999)
print(out.decode("ascii"))
channel.send('cd ..\n')
channel.send('cd simulator\n')
channel.send('ls\n')
while not channel.recv_ready():
time.sleep(3)
out = channel.recv(9999)
print(out.decode("ascii"))
ssh.close()
此代码存在一些问题:
print
并不总是打印ls
输出(有时它只打印在第二个print
上)。cd
和ls
命令始终存在于输出中(我通过recv
命令获取它们,作为输出的一部分),而以下所有{{1有时会打印和cd
命令,有时它们不是。ls
和cd
命令(打印时)始终显示在第一个ls
输出之前。我对这个"非决定论"感到困惑。非常感谢你的帮助。
答案 0 :(得分:16)
import paramiko
import re
class ShellHandler:
def __init__(self, host, user, psw):
self.ssh = paramiko.SSHClient()
self.ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.ssh.connect(host, username=user, password=psw, port=22)
channel = self.ssh.invoke_shell()
self.stdin = channel.makefile('wb')
self.stdout = channel.makefile('r')
def __del__(self):
self.ssh.close()
def execute(self, cmd):
"""
:param cmd: the command to be executed on the remote computer
:examples: execute('ls')
execute('finger')
execute('cd folder_name')
"""
cmd = cmd.strip('\n')
self.stdin.write(cmd + '\n')
finish = 'end of stdOUT buffer. finished with exit status'
echo_cmd = 'echo {} $?'.format(finish)
self.stdin.write(echo_cmd + '\n')
shin = self.stdin
self.stdin.flush()
shout = []
sherr = []
exit_status = 0
for line in self.stdout:
if str(line).startswith(cmd) or str(line).startswith(echo_cmd):
# up for now filled with shell junk from stdin
shout = []
elif str(line).startswith(finish):
# our finish command ends with the exit status
exit_status = int(str(line).rsplit(maxsplit=1)[1])
if exit_status:
# stderr is combined with stdout.
# thus, swap sherr with shout in a case of failure.
sherr = shout
shout = []
break
else:
# get rid of 'coloring and formatting' special characters
shout.append(re.compile(r'(\x9B|\x1B\[)[0-?]*[ -/]*[@-~]').sub('', line).
replace('\b', '').replace('\r', ''))
# first and last lines of shout/sherr contain a prompt
if shout and echo_cmd in shout[-1]:
shout.pop()
if shout and cmd in shout[0]:
shout.pop(0)
if sherr and echo_cmd in sherr[-1]:
sherr.pop()
if sherr and cmd in sherr[0]:
sherr.pop(0)
return shin, shout, sherr
答案 1 :(得分:0)
我基本上使用了所有代码,只添加了for循环:
commands = ["ls","command2","command3"]
conn_one = ShellHandler(host,name,pwd)
for command in commands:
conn_one.execute(command)
它使用正确的输出执行2个命令,但它只是坐在那里。我想知道是否需要在代码中的某处调用 del 。