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https://issues.apache.org/jira/browse/NET-462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bogdan Drozdowski updated NET-462:
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Attachment: ftp-bindlocal.diff
The attached patch fixes this by adding a new field in FTPClient. By calling
setPassiveLocalIPAddress(), you can set the local address to bind to. The field
will be used in the same place as in your code (but it is a separate value from
what getHostAddress returns).
In the meantime, you can create and install your own SocketFactory in the
FTPClient. You can take DefaultSocketFactory class as an example and make you
own factory, which will create sockes already bound to your local address. This
will work even with the older versions of Commons-Net.
> FTPClient in PASSIVE_LOCAL_DATA_CONNECTION_MODE cannot work when host have
> several different IP
> -----------------------------------------------------------------------------------------------
>
> Key: NET-462
> URL: https://issues.apache.org/jira/browse/NET-462
> Project: Commons Net
> Issue Type: Improvement
> Components: FTP
> Affects Versions: 3.1
> Environment: All OS,for example linux or windows and so on
> Reporter: Junsheng Chen
> Priority: Minor
> Labels: ActiveIp, FTPClient, PASSIVE_LOCAL_DATA_CONNECTION_MODE
> Fix For: 3.2
>
> Attachments: ftp-bindlocal.diff
>
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> When host have several different IP and client setting to
> PASSIVE_LOCAL_DATA_CONNECTION_MODE，_openDataConnection_ creating socket may
> use the unexpected ip。
> For example, The host have two Ips, one for intra and the another for extern,
> only the extern one can be connect with the outside。But when in
> PASSIVE_LOCAL_DATA_CONNECTION_MODE, FTPClient may be select the intra Ip, So
> it didn't work。
> So I change code like this, it can work normally by the specific ip.
> Code:
> In FTPClient._openDataConnection_(String command, String arg)，line 761 change
> as bellow:
> socket = _socketFactory_.createSocket();
>
> // add begin
> // local as client, transfer data must use the appointed local host
> socket.bind(new InetSocketAddress(getHostAddress(), 0));
> // add end
> After log in success,User can set the ip which he want to use by call the
> method in FTPClient:
> setActiveExternalIPAddress(String ip);
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