Public bug reported:
This bug has also been reported to debian [1].
1) lsb_release -rd
Description: Ubuntu 18.10
Release: 18.10
2) dpkg -l | grep libtorrent
ii libtorrent-rasterbar9 1.1.9-1
amd64 C++ bittorrent library by Rasterbar Software
ii python-libtorrent 1.1.9-1
amd64 Python bindings for libtorrent-rasterbar
* What led up to the situation?
My system has both IPv4 and IPv6 connections and I used deluged with
libtorrent to get the debian-9.5.0-amd64-netinst.iso .
* What exactly did you do (or not do) that was effective (or
ineffective)?
When I did an update tracker, I saw that 2 announce messages are sent.
One to the tracker's IPv4 address and one to the tracker's IPv6 address, but
the last one sent port=0 instead of the correct portnumber.
The order might change (first IPv6 and then IPv4).
* What was the outcome of this action?
I did a tcpdump of the connection to the debian tracker and saw the
following data:
To 130.239.18.159 on port 6969:
..`.NGD.GET
/announce?info_hash=%3b%1d%85%f8x%0e%f8%c4%d8S%8f%80%9azc%fcR%991%8e&peer_id=-DE13F0-a7HtrDr99EyW&port=28741&uploaded=0&downloaded=0&left=0&corrupt=0&key=EBA0497F&event=started&numwant=200&compact=1&no_peer_id=1&supportcrypto=1&redundant=0
HTTP/1.1
Host: bttracker.debian.org:6969
User-Agent: Deluge 1.3.15
Accept-Encoding: gzip
Connection: close
and to 2001:6b0:e:2018::159 on port 6969:
..5ENGD.GET
/announce?info_hash=%3b%1d%85%f8x%0e%f8%c4%d8S%8f%80%9azc%fcR%991%8e&peer_id=-DE13F0-a7HtrDr99EyW&port=0&uploaded=0&downloaded=0&left=0&corrupt=0&key=EBA0497F&event=started&numwant=200&compact=1&no_peer_id=1&supportcrypto=1&redundant=0
HTTP/1.1
Host: bttracker.debian.org:6969
User-Agent: Deluge 1.3.15
Accept-Encoding: gzip
Connection: close
Here you can see the port=0 part of the announce message, which will
make the tracker think the client is listening on port 0, but it is not.
* What outcome did you expect instead?
I would expect that both the IPv4 and IPv6 announce messages would send the
correct port
* Additional information
This issue has also been reported to upstream as #3306 [2] and has been fixed
with PR #3385 [3]. And it will be available in the next 1.1.X release.
I've added the patch that can be applied to fix the issue.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=911107
[2] https://github.com/arvidn/libtorrent/issues/3306
[3] https://github.com/arvidn/libtorrent/pull/3385
** Affects: libtorrent-rasterbar (Ubuntu)
Importance: Undecided
Status: New
** Tags: ipv6
** Patch added: "fix the port=0 issue"
https://bugs.launchpad.net/bugs/1801164/+attachment/5207977/+files/fix_port0_announce.patch
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https://bugs.launchpad.net/bugs/1801164
Title:
libtorrent sends port=0 via IPv6 announce instead of the correct port
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