pcapdump(1)pcapdump(1)NAME
pcapdump - dedicated packet capture utility
SYNOPSIS
pcapdump [OPTIONS]...
DESCRIPTION
pcapdump captures packets from a network interface and writes them to a dumpfile. The filename argument given to -w will be formated by
strftime(3).
PCAPNET OPTIONS -i interface
Input interface to read packets from.
-r pcap file
Dump file to read packets from.
-w pcap file
Dump file to write filtered packets to.
-f expression
BPF expression which selects packets to be filtered.
-s snaplen
Capture snaplen bytes of data from each packet.
-p Disable promiscuous mode sniffing.
PROGRAM OPTIONS -u owner
Set the output file's owning user to owner.
-g group
Set the output file's owning group to group.
-m mode
Set the output file's mode to mode, specified in octal.
-t secs
Dump file rotation interval in seconds.
-c count
Exit after capturing count packets.
-T secs
Exit after capturing during this amount of seconds.
-H Only capture link, network, and transport headers; do not capture application-layer data.
-S sample value
Sample the packet stream by only dumping 1 in every sample value packets.
-R Together with -S, sample the packets randomly, not systematically.
-P pidfile
Daemonize the process and write its PID to pidfile.
-C config file
File to read configuration variables from. Instead of passing configuration through the command line, a file can be used to specify
values for the bpf, device, filefmt, group, interval, mode, owner, promisc, and snaplen options (not all need to be specified; de-
faults will be used otherwise). See /usr/share/doc/pcaputils/examples/pcapdump/eth0 for an example.
9 May 2009 pcapdump(1)
Check Out this Related Man Page
PCAP_OPEN_LIVE(3PCAP)PCAP_OPEN_LIVE(3PCAP)NAME
pcap_open_live - open a device for capturing
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t *pcap_open_live(const char *device, int snaplen,
int promisc, int to_ms, char *errbuf);
DESCRIPTION
pcap_open_live() is used to obtain a packet capture handle to look at packets on the network. device is a string that specifies the net-
work device to open; on Linux systems with 2.2 or later kernels, a device argument of "any" or NULL can be used to capture packets from all
interfaces.
snaplen specifies the snapshot length to be set on the handle.
promisc specifies if the interface is to be put into promiscuous mode.
to_ms specifies the read timeout in milliseconds.
RETURN VALUE
pcap_open_live() returns a pcap_t * on success and NULL on failure. If NULL is returned, errbuf is filled in with an appropriate error
message. errbuf may also be set to warning text when pcap_open_live() succeeds; to detect this case the caller should store a zero-length
string in errbuf before calling pcap_open_live() and display the warning to the user if errbuf is no longer a zero-length string. errbuf
is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars.
SEE ALSO pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
5 April 2008 PCAP_OPEN_LIVE(3PCAP)
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