FTP DTP not binding to correct IP Address

	alepra1 reported
Trac ID	trac#4256
Type	defect
Created	2010-02-04 20:24:07Z

When serving FTP on a box with multiple IP address, the DTP Protocol may bind to the wrong address when handling a PORT command.

For ex., I have a server with the following addresses:
192.168.1.8 -
192.168.1.9 -
192.168.1.10

When a connection to the FTP server is made on address 192.168.1.9, and an active file transfer is started, the DTP connection starts from 192.168.1.8

This may end up resulting in the impossibility to setup the data connection if the server is multi-homed.

I have attached a simple patch that seems to solve the problem for me, but is quite untested.

Attachments:

• ftp.patch (521 bytes) - added by alepra1 on 2010-02-04 20:24:39Z -

trac-id__4256 4256
type__defect defect
reporter__alepra1 alepra1
priority__normal normal
milestone__ 
branch__ 
branch_author__ 
status__new new
resolution__None None
component__ftp ftp
keywords__ 
time__1265315047000000 1265315047000000
changetime__1265318997000000 1265318997000000
version__None None
owner__ 
cc__pradu@... cc__exarkun

Start by reviewing the attached ftp.patch and the FTP DTP handling for active PORT commands. Reproduce the case on a multi-homed server with several local addresses, then verify that the data connection uses the address receiving the control connection and add or update coverage for that behavior.