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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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PCAP_SET_PROTOCOL(3PCAP) PCAP_SET_PROTOCOL(3PCAP)
pcap_set_protocol - set capture protocol for a not-yet-activated cap‐
ture handle
#include <pcap/pcap.h>
int pcap_set_protocol(pcap_t *p, int protocol);
On network interface devices on Linux, pcap_set_protocol() 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().
pcap_set_protocol() returns 0 on success or PCAP_ERROR_ACTIVATED if
called on a capture handle that has been activated.
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), socket(2),
pcap_setfilter(3PCAP)
This page is part of the libpcap (packet capture library) project.
Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this manual
page, see ⟨http://www.tcpdump.org/#patches⟩. This page was obtained
from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2018-02-02.
(At that time, the date of the most recent commit that was found in
the repository was 2018-01-31.) If you discover any rendering prob‐
lems in this HTML version of the page, or you believe there is a bet‐
ter or more up-to-date source for the page, or you have corrections
or improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to man-pages@man7.org
3 January 2014 PCAP_SET_PROTOCOL(3PCAP)
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