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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that: (1) source code distributions
retain the above copyright notice and this paragraph in its entirety, (2)
distributions including binary code include the above copyright notice and
this paragraph in its entirety in the documentation or other materials
provided with the distribution, and (3) all advertising materials mentioning
features or use of this software display the following acknowledgement:
``This product includes software developed by the University of California,
Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
the University nor the names of its contributors may be used to endorse
or promote products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
PCAP_SET_PROTOCOL_LINUX 3PCAP "24 August 2017"
NAME
pcap_set_protocol_linux - set capture protocol for a not-yet-activated
capture handle
SYNOPSIS
#include <pcap/pcap.h>int pcap_set_protocol_linux(pcap_t *p, int protocol);
DESCRIPTION
On network interface devices on Linux,
pcap_set_protocol_linux() sets the protocol to be used in the
socket (2) call to create a capture socket when the handle is activated. The
argument is a link-layer protocol value, such as the values in the
<linux/if_ether.h> header file, specified in host byte order.
If
protocol is non-zero, packets of that protocol will be captured when the
handle is activated, otherwise, all packets will be captured. This
function is only provided on Linux, and, if it is used on any device
other than a network interface, it will have no effect.
It should not be used in portable code; instead, a filter should be specified with pcap_setfilter() .
If a given network interface provides a standard link-layer header, with a standard packet type, but provides some packet types with a different socket-layer protocol type from the one in the link-layer header, that packet type cannot be filtered with a filter specified with pcap_setfilter() but can be filtered by specifying the socket-layer protocol type using pcap_set_protocol_linux() .
RETURN VALUE
pcap_set_protocol_linux() returns 0 on success or
PCAP_ERROR_ACTIVATED if called on a capture handle that has been activated.
SEE ALSO
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), socket(2),
pcap_setfilter(3PCAP)