I ran the code that you supplied and received this. Google search suggests that I likely got that error code from terminating the script (Ctrl+C)
Code:
^C1091 packets captured
1091 packets received by filter
0 packets dropped by kernel
Return code : 130
When I run it this way I get a 0 error code (although Im still killing it with Ctrl+c)
Code:
#! /bin/bash
while true
do
if tcpdump -s 700 -t -n -N -X src 67.11.11.11 | grep -E "Miami|Austin|Chicago|Reno"
then
echo " found at " $(date)
play sound.mp3
fi
echo "Return code : $?"
done
1774 packets received by filter
0 packets dropped by kernel
Return code : 0
Moderator's Comments:
Please start using code tags. Thank you.
Last edited by Scott; 07-22-2010 at 03:16 PM..
Reason: Code tags
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LEARN ABOUT LINUX
pcap_stats
PCAP_STATS(3PCAP)PCAP_STATS(3PCAP)NAME
pcap_stats - get capture statistics
SYNOPSIS
#include <pcap/pcap.h>
int pcap_stats(pcap_t *p, struct pcap_stat *ps);
DESCRIPTION
pcap_stats() fills in the struct pcap_stat pointed to by its second argument. The values represent packet statistics from the start of the
run to the time of the call.
pcap_stats() is supported only on live captures, not on ``savefiles''; no statistics are stored in ``savefiles'', so no statistics are
available when reading from a ``savefile''.
A struct pcap_stat has the following members:
ps_recv
number of packets received;
ps_drop
number of packets dropped because there was no room in the operating system's buffer when they arrived, because packets
weren't being read fast enough;
ps_ifdrop
number of packets dropped by the network interface or its driver.
The statistics do not behave the same way on all platforms. ps_recv might count packets whether they passed any filter set with pcap_set-
filter(3PCAP) or not, or it might count only packets that pass the filter. It also might, or might not, count packets dropped because
there was no room in the operating system's buffer when they arrived. ps_drop is not available on all platforms; it is zero on platforms
where it's not available. If packet filtering is done in libpcap, rather than in the operating system, it would count packets that don't
pass the filter. Both ps_recv and ps_drop might, or might not, count packets not yet read from the operating system and thus not yet seen
by the application. ps_ifdrop might, or might not, be implemented; if it's zero, that might mean that no packets were dropped by the
interface, or it might mean that the statistic is unavailable, so it should not be treated as an indication that the interface did not drop
any packets.
RETURN VALUE
pcap_stats() returns 0 on success and returns -1 if there is an error or if p doesn't support packet statistics. If -1 is returned,
pcap_geterr() or pcap_perror() may be called with p as an argument to fetch or display the error text.
SEE ALSO pcap(3PCAP), pcap_geterr(3PCAP)
7 September 2009 PCAP_STATS(3PCAP)
07-22-2010
