我正试图从PC上ssh隧道 - > server1 ---> server2 ---->交换机1 这可以通过一个简单的常规终端来实现:ssh switch1它引用了我的ssh_config:
Host server1
user bill
Hostname server1
ForwardAgent yes
IdentityFile ~/.ssh/id_rsa
ProxyCommand none
Host server2
user bill
Hostname server2
IdentityFile ~/.ssh/id_rsa
ProxyCommand ssh server1 /usr/bin/nc %h %p
Host switch1
user bill
Hostname %h.omniture.com
ProxyCommand ssh server2 /usr/bin/nc %h %p
常规终端没问题。但是,尝试构建一个python脚本来实现它已经证明是困难的。
脚本如下:
import paramiko
import subprocess
import getpass
import os
def ssh_command(ip, user, passwd, command):
client = paramiko.SSHClient()
client.load_host_keys('/Users/bill/.ssh/known_hosts')
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
config = paramiko.SSHConfig()
if os.path.exists('/etc/ssh/ssh_config'):
config.parse(open('/etc/ssh/ssh_config'))
if os.path.exists(os.path.expanduser('~/.ssh/config')):
config.parse(open(os.path.expanduser('~/.ssh/config')))
host = config.lookup(ip)
if 'proxycommand' in host:
proxy = paramiko.ProxyCommand(
subprocess.check_output(
[os.environ['SHELL'], '-c', 'echo %s' %
host['proxycommand']]
).strip()
)
else:
proxy = None
client.connect(host['hostname'], username='bill',
password=getpass.getpass(), sock=proxy)
ssh_session = client.get_transport().open_session()
if ssh_session.active:
ssh_session.exec_command(command)
print ssh_session.recv(1024)
return
ssh_command('sw-a-102.sin2', 'bill', getpass.getpass(), 'show ver')
我得到的错误是:
No handlers could be found for logger "paramiko.transport"
Traceback (most recent call last):
File "/Users/bill/git/tools/python/dns-check/proxy-test.py", line 34, in <module>
ssh_command('switch1', 'bill', getpass.getpass(), 'show ver')
File "/Users/bill/git/tools/python/dns-check/proxy-test.py", line 28, in ssh_command
client.connect(host['hostname'], username='bill', password=getpass.getpass(), sock=proxy)
File "/Library/Python/2.7/site-packages/paramiko/client.py", line 265, in connect
t.start_client()
File "/Library/Python/2.7/site-packages/paramiko/transport.py", line 406, in start_client
raise e
paramiko.ssh_exception.ProxyCommandFailure: ('ssh server2 /usr/bin/nc switch1 22', 'Broken pipe')
如果我可以使用paramiko工作,这将是伟大的,如果有人知道更好的方式,那也将是好的。感谢您的时间。
答案 0 :(得分:0)
有一种更好的方式,仍然使用Paramiko但没有ProxyCommand
配置。
paramiko的代理命令支持的原因是错误并且容易出现竞争条件,这是上述错误的原因。
OTOH,SSH本身支持协议本身的隧道,并且不需要外部工具来实现它。
import paramiko
# Make clients
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy())
server2_client = paramiko.SSHClient()
server2_client.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy())
switch1_client = paramiko.SSHClient()
switch1_client.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy())
# Connect to server1 normally
client.connect('server1')
# Make channel server1 -> server2
server2_chan = client.get_transport().open_channel('direct-tcpip', ('<server2 ip>', 22,), ('127.0.0.1', 0))
# Connect to server2 via server1's channel
server2_client.connect('<server2 ip>', sock=server1_chan)
# Make channel server2 -> switch1
switch1_chan = server2_client.get_transport().open_channel('direct-tcpip', ('<switch1 ip>', 22,), ('127.0.0.1', 0))
# Finally connect to switch1 via server2 channel
switch1_client.connect('switch1', sock=server2_chan)
switch1_client.exec_command(<command>)
用其IP地址替换服务器和交换机名称。
另请参阅支持本机SSH隧道的parallel SSH client based on paramiko。