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[tor-bugs] #21136 [Obfuscation/Obfsproxy]: obfs4proxy doesn't listen on both 0.0.0.0 and [::]
#21136: obfs4proxy doesn't listen on both 0.0.0.0 and [::]
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Reporter: kaie | Owner: asn
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Obfuscation/Obfsproxy | Version:
Severity: Normal | Keywords:
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
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I'm using a system that has native IPv6 support and also IPv4
If obfs4proxy is started with the following configuration:
TOR_PT_SERVER_BINDADDR="obfs4-0.0.0.0:1234,obfs4-[::]:1234"
then obfs4proxy fails to bind to both ipv4 and ipv6.
Instead, the first call to Net.Listen will cause it to listen on [::], and
the second call will fail with "bind: port 1234 is already in use".
I found some discussions around the behavior of the Net, and it seems that
it tries to some automatic decisions which aren't perfect. I've seen a
recommendation that it's best to specifically request which tcp family is
requested.
I've implemented a patch that will request either tcp4 or tcp6, which
makes it work correctly for me, with the patch obfs4proxy will listen on
both 0.0.0.0 and [::]
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21136>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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