how to print timestamp in output files for every message

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pavan...@gmail.com

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Feb 24, 2016, 9:29:51 AM2/24/16
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I am using tcpflow 1.3.0 version for CentOS 5 to capture tcp data on sockets and print tcp messages to files.  But I would like to see the time when the message is received/sent at the message level(not file level). Right now it is printing just the message  Is there an option to set ? If not can someone please suggest where I can make modifications in the code to include timestamps using time from the local linux server?

Thanks

Simson Garfinkel

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Feb 28, 2016, 11:38:15 PM2/28/16
to tcpflo...@googlegroups.com, pavan...@gmail.com
What do you mean by "message level" ?  Are you referring to a particular TCP protocol?


On Feb 24, 2016, at 9:29 AM, pavan...@gmail.com wrote:

I am using tcpflow 1.3.0 version for CentOS 5 to capture tcp data on sockets and print tcp messages to files.  But I would like to see the time when the message is received/sent at the message level(not file level). Right now it is printing just the message  Is there an option to set ? If not can someone please suggest where I can make modifications in the code to include timestamps using time from the local linux server?

Thanks

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pavan...@gmail.com

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Mar 2, 2016, 3:31:48 PM3/2/16
to tcpflow-users, pavan...@gmail.com
The idea was to capture the tcp message and prepend it with current timestamp and log it to files.  I was able to achieve it.   But now I have another issue.  When I try to monitor the sockets on localhost it works even after giving the ip address of the server.  But when I run tcpflow to monitor sockets on remote server tcpflow is not working.

My tcpflow command is :

tcpflow -c -i any host 172.xx.xxx.111 and tcp dst portrange 1000-65000 and src portrange 1000-65000

If I run the above command from the same machine it works but if I run it from another server it does not work.  Can you please help me how to make this work?

thanks

Simson Garfinkel

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Mar 2, 2016, 9:19:26 PM3/2/16
to tcpflo...@googlegroups.com, pavan...@gmail.com
Hi.

You are having problems with libpcap and basic packet capturing. I suggest you check your commands first using tcpdump. You can also capture the packets first using tcpdump and reassemble the tcp streams at a later point in time. That will provide the functionality you wish.

I'm sorry, but I cannot provide you with technical support regarding packet capture issues.

pavan...@gmail.com

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Mar 3, 2016, 9:17:43 AM3/3/16
to tcpflow-users, pavan...@gmail.com
Thank you for the input.  I have checked the tcpdump commands. It also can monitor local ports only.  It is not capturing the packets from the ports of a remote server.  So it looks like tcpdump/tcpflow cannot capture the data from ports of a remote server.  Only local ports can be monitored. My idea  was to install tcpflow on a different machine(Server #2) and monitor ports of a remote server(Server #1) from Server #2 so that Server #1 will not have the performance hit.

Thanks again 
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