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Re: [tor-dev] Stegotorus now available from gitweb.torproject.org



On Mon, Jun 04, 2012 at 09:35:10PM -0700, Zack Weinberg wrote:
> On 2012-06-04 8:13 PM, David Fifield wrote:
> >
> >$ git clone https://git.torproject.org/stegotorus.git
> >$ cd stegotorus
> >$ autoreconf -i
> >$ ./configure&&  make
> >$ ./stegotorus null socks 127.0.0.1:5000
> >[info] ./stegotorus process 28359 now initialized
> >$ tor ClientTransportPlugin "stegotorus socks4 127.0.0.1:5000" UseBridges 1 Bridge "stegotorus 87.73.82.145:8080"
> >
> >I found the bridge IP address in scripts/torrc. At this point stegotorus
> >printed out:
> >
> >[info] 127.0.0.1:5000: new connection to socks client from 127.0.0.1:42233
> >[info]<1>  trying to connect to 87.73.82.145:8080
> >[info]<1.1>  network error in read: Connection reset by peer
> >
> >[error] Segmentation fault at 0000000000000010
> >./stegotorus[0x4054b6]
> >/lib/x86_64-linux-gnu/libc.so.6(+0x324f0)[0x7fcff4cee4f0]
> >./stegotorus[0x40ec11]
> >./stegotorus[0x405f7a]
> >/usr/lib/libevent-2.0.so.5(+0x1bc4a)[0x7fcff5df8c4a]
> >/usr/lib/libevent-2.0.so.5(event_base_loop+0x414)[0x7fcff5dee254]
> >./stegotorus[0x404e76]
> >/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd)[0x7fcff4cdaead]
> >./stegotorus[0x405291]
> >Segmentation fault
> 
> This looks like a genuine bug - probably failure to handle
> ECONNRESET correctly somewhere.  I'll see if I can reproduce it, but
> it would be helpful to me if you changed your stegotorus invocation
> to
> 
> ./stegotorus --log-min-severity=debug \
>   null socks 127.0.0.1:5000 >& stegotorus.log
> 
> and sent me (off-list) the log file.

So, I don't get the crash today, but also the bridge address is today
accepting my connections. So I can actually get Tor to build a circuit
and everything. This is in stegotorus-null.log.gz.

I also tried against a server that sends a RST to try to simulate what
happened yesterday, but it appears to be gracefully handled. That log is
stegotorus-rst.log.gz.

Sorry, I should have tried this again yesterday. Maybe I had a glibc
version skew or something that resolved itself upon rebooting.

David
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Attachment: stegotorus-rst.log.gz
Description: Binary data

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