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From "Bogdan Drozdowski (JIRA)" <>
Subject [jira] [Updated] (NET-462) FTPClient in PASSIVE_LOCAL_DATA_CONNECTION_MODE cannot work when host have several different IP
Date Wed, 04 Jul 2012 16:54:34 GMT


Bogdan Drozdowski updated NET-462:

    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
> FTPClient in PASSIVE_LOCAL_DATA_CONNECTION_MODE cannot work when host have several different
> -----------------------------------------------------------------------------------------------
>                 Key: NET-462
>                 URL:
>             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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