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pcap_lookupnet(3pcap) [centos man page]

PCAP_LOOKUPNET(3PCAP)													     PCAP_LOOKUPNET(3PCAP)

NAME
pcap_lookupnet - find the IPv4 network number and netmask for a device SYNOPSIS
#include <pcap/pcap.h> char errbuf[PCAP_ERRBUF_SIZE]; int pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp, char *errbuf); DESCRIPTION
pcap_lookupnet() is used to determine the IPv4 network number and mask associated with the network device device. Both netp and maskp are bpf_u_int32 pointers. RETURN VALUE
pcap_lookupnet() returns 0 on success and -1 on failure. If -1 is returned, errbuf is filled in with an appropriate error message. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars. SEE ALSO
pcap(3PCAP) 5 April 2008 PCAP_LOOKUPNET(3PCAP)

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PCAP_OPEN_LIVE(3PCAP)													     PCAP_OPEN_LIVE(3PCAP)

NAME
pcap_open_live - open a device for capturing SYNOPSIS
#include <pcap/pcap.h> char errbuf[PCAP_ERRBUF_SIZE]; pcap_t *pcap_open_live(const char *device, int snaplen, int promisc, int to_ms, char *errbuf); DESCRIPTION
pcap_open_live() is used to obtain a packet capture handle to look at packets on the network. device is a string that specifies the net- work device to open; on Linux systems with 2.2 or later kernels, a device argument of "any" or NULL can be used to capture packets from all interfaces. snaplen specifies the snapshot length to be set on the handle. promisc specifies if the interface is to be put into promiscuous mode. to_ms specifies the read timeout in milliseconds. RETURN VALUE
pcap_open_live() returns a pcap_t * on success and NULL on failure. If NULL is returned, errbuf is filled in with an appropriate error message. errbuf may also be set to warning text when pcap_open_live() succeeds; to detect this case the caller should store a zero-length string in errbuf before calling pcap_open_live() and display the warning to the user if errbuf is no longer a zero-length string. errbuf is assumed to be able to hold at least PCAP_ERRBUF_SIZE chars. SEE ALSO
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP) 5 April 2008 PCAP_OPEN_LIVE(3PCAP)
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