Create an extensible getPassiveExternalAddress() method in PASV command so ftp
integrators can define additional ways to obtain their 'external passive
address'.
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Key: FTPSERVER-300
URL: https://issues.apache.org/jira/browse/FTPSERVER-300
Project: FtpServer
Issue Type: Improvement
Reporter: David Latorre
PASV command will return the server's ip address and a port number to the
client in order for this to initiate a new data connection.
In the case we are behind a NAT proxy, we need to figure out what is the IP
address the client is actually connecting to. For this, ftpserver provides a
configuration option to establish the IP address which will be returned after
a PASV command is sent.
This method will work in a number of cases but it is not enough in several
others , e.g., if the server has a dynamic ip or if different users see
different ips for the same machine ( which can be the case, it is my case
actually) .
So we might add a protected method getExternalPassiveAddress() in PASV command
implementation so the external ip guessing can be customized as needed by
extenders. Otherwise, the whole Passive method should be re-implemented.
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