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March 20th, 2009
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 Can't detect queries when using wireshark Hello, I am writing a program I want to use to detect queries using the libraries from Wireshark (a network protocol analyzer). The problem is not the program, but the Limewire I want to detect queries from. I have Limewire 4.18.3, which after a few hours of being up is connected as an Ultrapeer. I make a search through the user interface and get some results. I use at the same time Wireshark (for testing purposes) to capture the packets sent to my computer so that I can trace the query sent by Limewire and the queryhits sent by the other peers/leafs. Most of the packets flow through TCP connections, I assume the same connections established with my peers/leafs. Some queryhits arrive through UDP. The problem is that I can't recognize any of the messages (query and queryhits), because they look like encrypted (in the TCP case). None of the messages I capture follow the Gnutella specification. They just have garbage (to me, but not to Limewire). The only way to recognize something (at least parts of it, in which case the packet follow the Gnutella specification) is when the queryhit arrives through UDP. I don't have a clue why this is happening because Gnutella is open and I should see all the fields of the protocol in the packet trace and easily recognize a queryhit. The same case for a query. Do any of you have a clue why this is happening? I have done this with Bearshare and the same happens. Is there something I am missing here? I know queryhits might flow through the TCP connections, but encrypted?? thanks all! Mike  |
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May 4th, 2009
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 Hi Mike, I have the same problem as you with wireshark and the packets return by my gnutella client (gtk-gnutella). The data are not encrypted but compressed with zlib. As someone a solution to see easily the gnutella protocol packets in wireshark or should I write some code to decompress the stream received from the ultrapeers ? Thanks in advance for your answers. Regards Yodoloi |
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May 4th, 2009
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| RE: hello Yodoloi, I didn't recall the deflate option used at the beginning of the handshake by the time I wrote this post. What I did is that I used the Limewire source and modified the source for it to send everything not compressed. I was lazy enough to write the code to decompress it. A cool thing would be though if the libraries used by Wireshark (libpcap or winpcap) had the option of decompressing the payload of a packet, like you said. That would save a lot. And it doesn't sound unreasonable. I actually wrote a program to detect gnutella traffic. I will try to find something like that and post it here. Mike |
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May 13th, 2009
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| hello Mike, Could you tell me which file did you modify on the limewire code. I tried to search some library for wireshark and to recompile wireshark on my linux computer with differents options, but without success to decompress the packets on wireshark.  Actually I'm trying to write a littel client (juste with the basic fonctionality ping, pong, query, query hit, bye) in C# for my Master project, and I think in the beginning I will not use the deflate option, I don't know if it's a good idea but for the moment it's the fatest way to have a prototype working in a short time. Juan |
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May 13th, 2009
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| Re: Hello Juan, the file is the following: LimeWire/core/com/limegroup/gnutella/settings/ConnectionSettings.java Two lines I changed: 157: FACTORY.createBooleanSetting("ACCEPT_GNUTELLA_DEFL ATE", true); I changed the true for a false FACTORY.createBooleanSetting("ACCEPT_GNUTELLA_DEFL ATE", false); 167: FACTORY.createBooleanSetting("ENCODE_GNUTELLA_DEFL ATE", true); I changed the true for a false FACTORY.createBooleanSetting("ENCODE_GNUTELLA_DEFL ATE", false); I don't recall changing anything else. I know also is not the best idea, but I am on the same situation, for prototype purposes. Hope it helps! mikejim |
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March 22nd, 2010
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| query Hi, the query and query hit is transmit using udp or tcp? Where can I know which message using tcp or udp of limewire,I just find little udp message such as ping ,pong when bootstrap and handshake,why? If the limewire using tls encryption,then we don't see the content using wireshark,isn't it? |
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