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Full Discussion: Creating an Interactive Bash Script to Analyze a PCAP
Top Forums Shell Programming and Scripting Creating an Interactive Bash Script to Analyze a PCAP Post 302795269 by MrTuxor on Wednesday 17th of April 2013 01:23:49 PM
Old 04-17-2013
Creating an Interactive Bash Script to Analyze a PCAP
Hello Everyone,

I am currently trying to write a Bash Script to call a PCAP file. The command I will use in the script will be the following:

tshark -r test.pcap -T fields -e frame.number -e frame.time -e eth.src -e eth.dst -e ip.src -e ip.dst -r ip.proto -E header=y -E separator=, quote=d -E occurance=f > pcap.csv

This command will allow me to see everything I need in a nicely formatted CSV file however I am struggling to write an interactive script to input both the name of the pcap (testfile.pcap above) and the name of the csv file (testfile.csv above) for the output to be saved to.

Does anyone know how I could put this into an interactive script so that when an admin runs the script, they can input the name of the existing pcap and the name of the csv file that the formatted information should be saved to?

So far my script contains the following:
#!/bin/bash

echo="What is the name of your PCAP input file?"

echo="What is the name of your CSV output file?

tshark -r test.pcap -T fields -e frame.number -e frame.time -e eth.src -e eth.dst -e ip.src -e ip.dst -r ip.proto -E header=y -E separator=, quote=d -E occurance=f > pcap.csv

I have been watching and reading a lot about bash scripting and I think the test.pcap and pcap.csv above should each be a variable but how do I make a variable represent something input by a user? Essentially I would like the user to be able to enter in the name of the pcap (and location if need be) to analyze, followed by the name of the csv file to send the output to.

Thanks in advance!

Tuxor
 

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LEARN ABOUT DEBIAN

pcap_fopen_offline

PCAP_OPEN_OFFLINE(3PCAP)												  PCAP_OPEN_OFFLINE(3PCAP)

NAME

       pcap_open_offline, pcap_fopen_offline - open a saved capture file for reading

SYNOPSIS

       #include <pcap/pcap.h>

       char errbuf[PCAP_ERRBUF_SIZE];

       pcap_t *pcap_open_offline(const char *fname, char *errbuf);
       pcap_t *pcap_fopen_offline(FILE *fp, char *errbuf);

DESCRIPTION

       pcap_open_offline() is called to open a ``savefile'' for reading.

       fname  specifies  the  name of the file to open. The file can have the pcap file format as described in pcap-savefile(5), which is the file
       format used by, among other programs, tcpdump(1) and tcpslice(1), or can have the pcap-ng file format, although not all pcap-ng	files  can
       be read.  The name "-" in a synonym for stdin.

       Alternatively,  you  may  call pcap_fopen_offline() to read dumped data from an existing open stream fp.  Note that on Windows, that stream
       should be opened in binary mode.

RETURN VALUE

       pcap_open_offline() and pcap_fopen_offline() return a pcap_t * on success and NULL on failure.  If NULL is returned, errbuf  is	filled	in
       with an appropriate error message.  errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.

SEE ALSO

       pcap(3PCAP), pcap-savefile(5)

								   5 April 2008 					  PCAP_OPEN_OFFLINE(3PCAP)
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