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pcap_setdirection(3pcap)

25 July 2018

libpcap0.8-dev

development library and header files for libpcap0.8

libpcap

A system-independent interface for user-level packet capture

libpcap-devel

Libraries and header files for the libpcap library

NAME

pcap_setdirection - set the direction for which packets will be captured

SYNOPSIS

#include <pcap/pcap.h>

int pcap_setdirection(pcap_t *p, pcap_direction_t d);

DESCRIPTION

pcap_setdirection() is used to specify a direction that packets will be captured. d is one of the constants PCAP_D_IN, PCAP_D_OUT or PCAP_D_INOUT. PCAP_D_IN will only capture packets received by the device, PCAP_D_OUT will only capture packets sent by the device and PCAP_D_INOUT will capture packets received by or sent by the device. PCAP_D_INOUT is the default setting if this function is not called.
pcap_setdirection() isn’t necessarily fully supported on all platforms; some platforms might return an error for all values, and some other platforms might not support PCAP_D_OUT.
This operation is not supported if a ‘‘savefile’’ is being read.

RETURN VALUE

pcap_setdirection() returns 0 on success and PCAP_ERROR on failure. If PCAP_ERROR is returned, pcap_geterr(3PCAP) or pcap_perror(3PCAP) may be called with p as an argument to fetch or display the error text.

SEE ALSO

REFERENCED BY

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