Python SFTP Paramiko: catch Wrong Hostname Error-CodePudding

I am currently testing an exception for when the username or host is wrong but I don't know which exception I should catch. I tried BadHostkeyException but apparently that was wront. If I catch socket.gaierror then that would be to vague.

I am getting this Output:

  File "./sFTPscript10.py", line 141, in connSFTP
    c.connect( hostname = config.host, username = config.username, pkey = k )
  File "/usr/local/lib/python3.6/site-packages/paramiko/client.py", line 340, in connect
    to_try = list(self._families_and_addresses(hostname, port))
  File "/usr/local/lib/python3.6/site-packages/paramiko/client.py", line 204, in _families_and_addresses
    hostname, port, socket.AF_UNSPEC, socket.SOCK_STREAM
  File "/usr/lib64/python3.6/socket.py", line 745, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

My Code:

def connSFTP(config,logger_info,logger_error,resetConnSFTP,logger_error_mail,reset):
    #Fehleroptionen 1. Pfad zum SSH-KeyError
                        #-SSH-Key vorhanden?
                    #2.Host und/oder Username ist falsch
    try:
        k = paramiko.RSAKey.from_private_key_file(config.ssh_key_filepath) #SSH KEY
        c = paramiko.SSHClient()
        c.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        c.connect( hostname = config.host, username = config.username, pkey = k )
        sftp = c.open_sftp()
        logger_info.info('Connected with '  config.host)

        return sftp

    except (paramiko.BadHostKeyException) as err:
        print('Username or Host is wrong'   str(err))

CodePudding user response：

You can see yourself that the exception is socket.gaierror. There's no more specific exception.

You can check the errno for more specific error (-2 in your case). But note that it won't be platform independent.

except socket.gaierror as e:
    print(e.errno)