[Pidgin] #16711: Randomize manual filetransfer port range

[Pidgin]

#16711: Randomize manual filetransfer port range
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 Reporter:  Beanow       |      Owner:
     Type:  enhancement  |     Status:  new
Milestone:               |  Component:  pidgin (gtk)
  Version:  2.10.9       |   Keywords:
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 Because the "automatic router port forwarding" option caused issues for
 me, I opted for a manual port range.

 Using this I noticed a privacy issue. File transfer ports (using
 http://xmpp.org/extensions/xep-0065.html socks5 bytestreams) always start
 at the beginning of this range. Which will leak to your contact's client
 and server how many file transfers you currently are performing if they
 can guess/deduce the first port in the range.

 I suggest to always take a random (available) port from the range instead
 of starting at the beginning.

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Ticket URL: <https://developer.pidgin.im/ticket/16711>
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