pcap_set_protocol_linux - activated capture handle
#include <pcap/pcap.h> int pcap_set_protocol_linux(pcap_t *p, int protocol);
PCAP_SET_PROTOCOL_LINUX(3pcap)
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 pro-
tocol 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(3PCAP).
If a given network interface provides a standard link-layer header,
with a standard packet type, but provides some packet types with a dif-
ferent 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.
BACKWARD COMPATIBILITY
This function became available in libpcap release 1.9.0.
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+------------------------+
|Availability | system/library/libpcap |
+---------------+------------------------+
|Stability | Uncommitted |
+---------------+------------------------+
SEE ALSO
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP)
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from https://www.tcpdump.org/release/libp-
cap-1.9.1.tar.gz.
Further information about this software can be found on the open source
community website at https://www.tcpdump.org/.
24 August 2017
PCAP_SET_PROTOCOL_LINUX(3pcap)