November 2012 - Ibr-dtn - lists.ibr.cs.tu-bs.de

Any tutorial?
by Chen Yang 30 Nov '12

30 Nov '12

Hi all, Is there any tutorial for how to use IBR-DTN? I noticed that all the README.txt are either empty or just the copy right. I also found this link from the archive of the mailing list but it is not working now. http://www.ibr.cs.tu-bs.de/projects/ibr-dtn/getstarted.html I have already got two nodes connected and used dtnsend to send data. If I want to know more detail about the ibr-dtn, do I have to look at the source code? Thanks. Chen Yang

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Bundle's Discard Politic
by João Paulo Ramirez 30 Nov '12

30 Nov '12

Good night, I've been browsing the ibr dtn source code in the project wiki and I've ran into the StorageSizeExeededException at the line 125 in the BundleStorage::allocSpace() method in the BundleStorage.cpp. Nevertheless, I could not find where this exception is treated. In fact, I am doing a work about the discard politic of DTN and I was trying to find this politic implementation in the ibr dtn. So, I supose I'll find that when meet the place of the source code where this exception is treated. If you could help me with that and tell me about this politic in the ibr dtn I would be very thankful. Thanks in advance. João Paulo de Freitas Ramirez

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how filetransfer with filename
by 고석갑 30 Nov '12

30 Nov '12

Hello. I am tring to send a file from Android to Linux server using ibrdtn. dtnapi has send(dest, fd, len) method to send a file under Android, and dtnrecv can receive content of the file under Linux. However, we do not have a way to send its filename One way is to add special header to include filename into file. And, dtnrecv extract filename from the received file. However, this way may be too slow because of file copy if the file is big. I think better way to add a dtn block including filename into a dtn bundle. I do not know if there is that block spec in irtf drafts. We need new api method for it in Android dtnapi and to make dtnrecv support it and rename filename using that block. Thank you. - Softgear Ko

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Bundle size limit (< 1M) of Android application.
by Yoshimi Fujii 20 Nov '12

20 Nov '12

Hello, When I'm trying to send a file more than 1M byte as a bundle, some Java exception seems to be raised and it always fails. With Linux application, no problem with files over 1M byte. Do you think of any cause of this problem? -- Yoshimi Fujii Kozo Keikaku Engineering, Inc. TEL +81 3 5342 1129

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Queue Management and Forwarding Policy implementation
by Guilherme Rolim 02 Nov '12

02 Nov '12

Good day, I am interested in modifying the IBR-DTN code. In doing so, I plan to make changes on the DTN Queue Management and Forwarding Policy, however, I don't know which classes to modify our work with. Could someone point me at the right direction? Thanks in advance, Guilherme Rolim

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terminate called after throwing an instance of 'ibrcommon::socket_exception'
by 고석갑 02 Nov '12

02 Nov '12

Hello. I downloaded ibrdtn source code using SVN. I am using Ubuntu-10.04.4 64bit. Because of compile error, I added ‘#include “Configuration.h”’ into BundleCore.cpp. Afterthat, I got successful compile. However, When I run ibrdtn with default configuration (no touched ibrdtnd.conf from SVN), I get 'ibrcommon::socket_exception’ error. softgear@softgear-cube02:~/dtn/ibrdtn-svn$ dtnd -c ibrdtnd.conf -d 1000 Thu Nov 1 23:07:32 2012 INFO: Configuration: ibrdtnd.conf Thu Nov 1 23:07:32 2012 INFO: IBR-DTN daemon 0.8.0 (build 59560) Thu Nov 1 23:07:32 2012 INFO: debug level set to 1000 Thu Nov 1 23:07:32 2012 INFO: use logfile for output: /var/log/ibrdtn/ibrdtn.log Thu Nov 1 23:07:32 2012 INFO: Local node name: dtn://softgear-cube02 Thu Nov 1 23:07:32 2012 INFO: using bundle storage in memory-only mode Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: DOWN -> SAFE_DOWN Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: SAFE_DOWN -> DOWN Thu Nov 1 23:07:32 2012 INFO: DiscoveryAgent: listen to [224.0.0.1]:4551 Thu Nov 1 23:07:32 2012 INFO: StandByManager: IPNDAgent adopted Thu Nov 1 23:07:32 2012 INFO: Using default routing extensions Thu Nov 1 23:07:32 2012 INFO: Forwarding of bundles enabled. Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: DOWN -> SAFE_DOWN Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: SAFE_DOWN -> DOWN Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: DOWN -> SAFE_DOWN Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: SAFE_DOWN -> DOWN Thu Nov 1 23:07:32 2012 INFO: API initialized using tcp socket: lo:4550 Thu Nov 1 23:07:32 2012 DEBUG.20: Initialize component StandByManager Thu Nov 1 23:07:32 2012 DEBUG.20: Initialize component MemoryBundleStorage Thu Nov 1 23:07:32 2012 DEBUG.20: Initialize component IPNDAgent Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: DOWN -> PENDING_UP Thu Nov 1 23:07:32 2012 DEBUG.66: SocketState transition: PENDING_UP -> DOWN terminate called after throwing an instance of 'ibrcommon::socket_exception' what(): failed to getaddrinfo with address: <any>:4551 Aborted softgear@softgear-cube02:~/dtn/ibrdtn-svn$ So, I tried to debug this as the following. softgear@softgear-cube02:~/dtn/ibrdtn-svn$ gdb daemon/src/.libs/dtnd Reading symbols from /home/softgear/dtn/ibrdtn-svn/daemon/src/.libs/dtnd...done. (gdb) r -c ibrdtnd.conf -d 1000 terminate called after throwing an instance of 'ibrcommon::socket_exception' what(): failed to getaddrinfo with address: <any>:4551 Program received signal SIGABRT, Aborted. 0x00007ffff69e0a75 in raise () from /lib/libc.so.6 (gdb) bt #0 0x00007ffff69e0a75 in raise () from /lib/libc.so.6 #1 0x00007ffff69e45c0 in abort () from /lib/libc.so.6 #2 0x00007ffff72998c5 in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/libstdc++.so.6 #3 0x00007ffff7297cf6 in ?? () from /usr/lib/libstdc++.so.6 #4 0x00007ffff7297d23 in std::terminate() () from /usr/lib/libstdc++.so.6 #5 0x00007ffff7297d36 in ?? () from /usr/lib/libstdc++.so.6 #6 0x00007ffff7297373 in __cxa_call_unexpected () from /usr/lib/libstdc++.so.6 #7 0x000000000046e5f2 in dtn::net::IPNDAgent::componentUp (this=<value optimized out>) at IPNDAgent.cpp:255 #8 0x000000000041e766 in __daemon_run (conf=<value optimized out>) at Main.cpp:892 #9 0x00007ffff69cbc4d in __libc_start_main () from /lib/libc.so.6 #10 0x000000000041b749 in _start () (gdb) So, After I traced the source code, I found that getaddrinfo(address, service, &hints, &res) returned -2 in udpsocket::bind(const vaddress &addr) throw (socket_exception) in ibrcommon/ibrcommon/net/socket.cpp . At that time, address was NULL. Could you help me? Thanks in advance. - Softgear Ko.

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