On Wed, Mar 18, 2009 at 12:02:23PM +0530, Rajkumar S wrote:
> Hello All,
>
> I am pretty new with OpenSolaris and trying to explore the possibility
> of using OS for one of my project.
>
> For my project I need to know the total number of bytes sent and
> received by an ip including that of ongoing sessions. OS records these
> information in a flow table and outputs to disk after end of each
> session. So out of box I can only get the count of completed sessions,
> and not that of ongoing sessions.
>
> Solaris documentation states that
>
> "The flowacct module gathers information about flows in a flow table
> that is composed of flow records. Each entry in the table contains one
> flow record. You cannot display a flow table."
>
> But my requirement needs the data from the current session also at the
> time of reading. Can dtrace help me to gather flow records that are
> stored in flow table?
Hi Rajkumar,
Well, looking at the code, flowacct_update_flows_tbl() is the nexus of
updating stats. so use:
fbt::flowacct_update_flows_tbl:entry
args[0] has the extracted information about the new element, in the form of a
header_t (defined in uts/common/ipp/flowacct/flowacct_impl.h)
Start with a script:
--- cut here ---
#!/usr/sbin/dtrace -s
#pragma D option quiet
BEGIN
{
printf("%-10s %-10s %10s\n", "SADDR", "DADDR", "PKTLEN");
}
fbt::flowacct_update_flows_tbl:entry
/args[0]->isv4/
{
/* ugly, but this is how it is stored */
this->saddr = inet_ntoa((ipaddr_t *)&args[0]->saddr.s6_addr32[3]);
this->daddr = inet_ntoa((ipaddr_t *)&args[0]->daddr.s6_addr32[3]);
printf("%-10s %-10s %10d\n", this->saddr, this->daddr, args[0]->pktlen);
}
fbt::flowacct_update_flows_tbl:entry
/!args[0]->isv4/
{
this->saddr = inet_ntoa6(&args[0]->saddr);
this->daddr = inet_ntoa6(&args[0]->daddr);
printf("%-10s %-10s %10d\n", this->saddr, this->daddr, args[0]->pktlen);
}
--- cut here ---
(this is untested, but I think it will work) To change the data you want to
collect, just change the printf()s.
Cheers,
- jonathan
> Since I am pretty new to OS and dtrace is bit daunting at first look,
> some pointers where I can start working would be very helpful
>
> thanks and regards,
>
> raj
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss@opensolaris.org
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