如何将连接超时设置为 sshtunnel

Question

我在 python 上使用 sshtunnel 模块中的 SSHTunnelForwarder。

给定下一个代码：

server = SSHTunnelForwarder(
    (sshServer, sshPort),
    ssh_username=sshUsername,
    ssh_password=sshPassword,
    remote_bind_address=(imapServer, imapPort),
    local_bind_address=('127.0.0.1', localPort)
)

print('STARTING')

server.start()

print(server.is_active)

有时需要很长时间，可能几分钟，然后我得到错误：

2019-04-22 22:25:54,365| ERROR   | Could not connect to gateway ip..... : 110
Traceback (most recent call last):
  File "PYTHON_TUNNEL.py", line 24, in <module>
    server.start()
  File "/home/mike/.local/lib/python2.7/site-packages/sshtunnel.py", line 1295, in start
    reason='Could not establish session to SSH gateway')
  File "/home/mike/.local/lib/python2.7/site-packages/sshtunnel.py", line 1101, in _raise
    raise exception(reason)
sshtunnel.BaseSSHTunnelForwarderError: Could not establish session to SSH gateway

Ubuntu18.04，python2.7

是否可以设置隧道建立超时？

Answer 1

在调用 connect 之前有一个 SSH_TIMEOUT constant with a default of None in sshtunnel.py that is set on the socket used to create the transport。

不幸的是，我自己无法测试，但您可以在启动隧道转发器之前尝试修补该常量：

import sshtunnel

sshtunnel.SSH_TIMEOUT = 5.0

server = sshtunnel.SSHTunnelForwarder([...])    
server.start()

还有一个 TUNNEL_TIMEOUT constant, but that seems to be used for checks if the tunnel is already established and for the call to open_channel on the underlying Paramiko Transport instance。它似乎在隧道的创建过程中没有发挥作用。
此外，TUNNEL_TIMEOUT 默认设置为一秒，并且您在 server.start() 之前遇到了长达一分钟的延迟BaseSSHTunnelForwarderError 被提出，这个常量似乎不太可能与您的问题的解决方案相关。

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