使用Paramiko在Python上用ssh实现交互式shell?
发布时间:2020-12-20 10:34:45 所属栏目:Python 来源:网络整理
导读: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.在查看paramikos的exec_command()函数之后,我意识到它不适合我的用例(因为在执行命令后通道被关闭),因为命令依赖于环境变量(由先前的命令设置)并且不能连接到一个exec_
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.在查看paramikos的exec_command()函数之后,我意识到它不适合我的用例(因为在执行命令后通道被关闭),因为命令依赖于环境变量(由先前的命令设置)并且不能连接到一个exec_command()调用,因为它们将在程序中的不同时间执行.
因此,我想在同一个通道中执行命令.我研究的下一个选项是使用paramikos的invoke_shell()函数实现交互式shell: 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_finaln') channel.send('lsn') while not channel.recv_ready(): time.sleep(3) out = channel.recv(9999) print(out.decode("ascii")) channel.send('cd ..n') channel.send('cd or_failn') channel.send('lsn') while not channel.recv_ready(): time.sleep(3) out = channel.recv(9999) print(out.decode("ascii")) channel.send('cd ..n') channel.send('cd simulatorn') channel.send('lsn') while not channel.recv_ready(): time.sleep(3) out = channel.recv(9999) print(out.decode("ascii")) ssh.close() 这段代码存在一些问题: >第一次打印并不总是打印ls输出(有时它只打印在第二次打印时). 我对这种“非决定论”感到困惑,非常感谢你的帮助. 解决方法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,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 (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |