How to extract the "info" field from a pcap file? - parsing

I have a pcap file with me and I opened it in Wireshark, I want to extract a specific field basically the "Info" field from the pcap trace and port it to a text file, which I can then parse and use for data analysis. I looked up certain StackOverflow posts and those posts mentioned to use TShark, but I couldn't find any way of extracting the "info" field using TShark. It would be great if someone could point me to an automated way of dumping field specific data to a text file. I have also pasted the image of the wireshark dump for convenience.

With tshark version 1.12.0 or later:
tshark -r inFile.pcap -T fields -e _ws.col.Info > outFile.csv

tshark -r FILE -T fields -e col.info
All of these options are documented in the manual: http://www.wireshark.org/docs/man-pages/tshark.html

Related

Problems finding human readable ascii text in log files

I understand that assisting with college assignments is frowned upon here but I am seeking help with grep. I have been searching for answers online all day & am running out of time.
I have a zipped logparse file that I have unzipped - it contains over 1000 logs, I need to examine the contents of this file to obtain a 72 character human readable text from one of the log files, any grep command i run freezes my VM, losing time re-booting ect., I have attempted
grep --text <file>
grep -a <file>
grep -w <file>
grep [char] <file> returns a output stating text has been detected but again when i go to view via vi or vim it again crashes
any help greatly appreciated,
Sarah

Does anyone know how to get the tdb2.dump command to actually do anything

I'm trying to dump a jena database as triples.
There seems to be a command that sounds perfectly suited to the task: tdb2.dump
jena#debian-clean:~$ ./apache-jena-3.8.0/bin/tdb2.tdbdump --help
tdbdump : Write a dataset to stdout (defaults to N-Quads)
Output control
--output=FMT Output in the given format, streaming if possible.
--formatted=FMT Output, using pretty printing (consumes memory)
--stream=FMT Output, using a streaming format
--compress Compress the output with gzip
Location
--loc=DIR Location (a directory)
--tdb= Assembler description file
Symbol definition
--set Set a configuration symbol to a value
--mem=FILE Execute on an in-memory TDB database (for testing)
--desc= Assembler description file
General
-v --verbose Verbose
-q --quiet Run with minimal output
--debug Output information for debugging
--help
--version Version information
--strict Operate in strict SPARQL mode (no extensions of any kind)
jena#debian-clean:~$
But I've not succeded in getting it to write anything to STDOUT.
When I use the --loc parameter to point to a DB, a new copy of that DB appears in the subfolder: Data-0001, but nothing appears in STDOUT.
When I try the --tdb parameter, and point it to a ttl file, I get a stack trace complaining about its formatting.
Google has turned up the Jena documentation telling me the command exists, and that's it. So any help appreciated.
"--loc" should be the same as used to create the database.
Suppose that's "DB2". For TDB2 (not TDB1) after the database is created, then "DB2/Data-0001" will already exist. Do not use this for --loc. Use "--loc DB2".
If it is a TDB1 database (the files are in the directory at "--loc", no "Datat-0001"), the use tdbdump. An empty database has no triples/quads in it so you would get no output.
Fuseki currently (up to 3.16.0) has to be called with the same setup each time it is run, which is fragile regarding TDB1/TDB2. If you created the TDB2 database outside Fuseki and only use command line args, you'll need "--tdb2" each time.
Fuseki in next release (3.17.0) detects existing database type.

Where packets are stored on tshark using live capture?

I'm writing a real time sniffer using python and tshark and I'm a bit worried about where packets or data are stored in tshark. The idea is being able to execute the python script for days or weeks without stopping it and I'm not really sure if this concern could be a problem.
I have studied and have tried to understand tshark source code from here but I didn't found any line of code concerning this issue.
Is there anyone who knows how this works?
Thank you.
So, by query, the packets captured on the interfaces are applied with the "filter" of the TShark options, and then redirected to the stdout. However, there exists provision to redirect it to specific log file, in specified format.
For Example:
tshark -T json -i eth0 -O UDP -n > log.out
For more options, refer here.

Setting ESP Preferences from commandline using tshark

There is a scripting need where i have to set the ESP preferences using tshark commandline. Does any one have idea how to pass this preferences from tshark commandline Ex: below
tshark -R "sip" -2 -r 131104_pcap.pcap -o esp.enable_null_encryption_decode_heuristic:true
I tried using the above command but getting the error "unknown preference" (May be because -o specifies change in preferences rather than esap_sa) I am using wireshark 1.8 on my pc. I see a file esp_sa in \Appdata\wireshark\ with below line "IPv4","","","*","AES-CBC [RFC3602]","0x3732297C3619A67029FA2C045869EDE1","HMAC-MD5-96 [RFC2403]","0x2B9F652AC3C0E6AEF19B82B060F28E6A" after adding the same from GUI. Also i see preferences file in the same location
So Is there any way to change this esp_qa using tshark line ??
The above command (with, of course, a different SIP capture file) works with my 1.8 version of tshark (i.e. no "unknown preference" message).
So: is this a "regions and languages" localization issue ?
Are you able to specify any preference ? For example:
tshark -o tcp.summary_in_tree:false

start capturing with command line in libpcap format

I try to start capturing with Wireshark using command line but the default output file is pcap extension but Wireshark - pcapng file type and I need libpcap file type.
My command is
tshark.exe" -i interfacenumber -W MyFile.pcap
I also tried
tshark.exe" -i 1 -F libpcap -W MyFile.pcap
and in this case no file created on my disk although I can see the packets in the command line window
tshark.exe -i 1 -F libpcap -w MyFile.pcap`
is the right answer (note the lower case 'w').
(-W does something different. There's lot's of tshark options, so you need to look carefully at the tshark -h output to make sure you're using the right option).
Since the -F libpcap option is not working for me either, I'm using another command line tool in the same directory:
editcap -F libpcap currentFile.pcap(ng) libpcapConvertedFile.pcap where "currentFile.whatever" is the pcapng-formatted file and "libpcapConvertedFile.whatever" is the outputted legacy libpcap format.
I run this once tshark is done capturing the original file.
I think that in the newest Wireshark versions (1.8.x or 1.10.x) you cannot start capturing in libpcap format and the default format is pcapng (also pcap extension - try to use verion 1.6.x)
That's what solve my problem
http://www.wireshark.org/download/win64/all-versions/
http://www.wireshark.org/download/win32/all-versions/

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