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73 lines
2.8 KiB
73 lines
2.8 KiB
4 months ago
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.\" Copyright (c) 1994, 1996, 1997
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that: (1) source code distributions
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.\" retain the above copyright notice and this paragraph in its entirety, (2)
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.\" distributions including binary code include the above copyright notice and
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.\" this paragraph in its entirety in the documentation or other materials
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.\" provided with the distribution, and (3) all advertising materials mentioning
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.\" features or use of this software display the following acknowledgement:
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.\" ``This product includes software developed by the University of California,
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.\" Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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.\" the University nor the names of its contributors may be used to endorse
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.\" or promote products derived from this software without specific prior
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.\" written permission.
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.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.TH PCAP_SET_PROTOCOL_LINUX 3PCAP "22 August 2018"
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.SH NAME
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pcap_set_protocol_linux \- set capture protocol for a not-yet-activated
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capture handle
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.SH SYNOPSIS
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.nf
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.ft B
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#include <pcap/pcap.h>
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.LP
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.ft B
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int pcap_set_protocol_linux(pcap_t *p, int protocol);
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.ft
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.fi
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.SH DESCRIPTION
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On network interface devices on Linux,
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.BR pcap_set_protocol_linux ()
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sets the protocol to be used in the
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.BR socket (2)
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call to create a capture socket when the handle is activated. The
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argument is a link-layer protocol value, such as the values in the
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.B <linux/if_ether.h>
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header file, specified in host byte order.
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If
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.I protocol
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is non-zero, packets of that protocol will be captured when the
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handle is activated, otherwise, all packets will be captured. This
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function is only provided on Linux, and, if it is used on any device
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other than a network interface, it will have no effect.
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.LP
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It should not be used in portable code; instead, a filter should be
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specified with
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.BR pcap_setfilter (3PCAP).
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.LP
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If a given network interface provides a standard link-layer header, with
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a standard packet type, but provides some packet types with a different
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socket-layer protocol type from the one in the link-layer header, that
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packet type cannot be filtered with a filter specified with
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.BR pcap_setfilter ()
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but can be filtered by specifying the socket-layer protocol type using
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.BR pcap_set_protocol_linux ().
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.SH RETURN VALUE
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.BR pcap_set_protocol_linux ()
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returns
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.B 0
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on success or
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.B PCAP_ERROR_ACTIVATED
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if called on a capture handle that has been activated.
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.SH BACKWARD COMPATIBILITY
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This function became available in libpcap release 1.9.0.
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.SH SEE ALSO
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.BR pcap (3PCAP),
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.BR pcap_create (3PCAP),
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.BR pcap_activate (3PCAP)
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