pcap_lookupnet3
Find the ipv4 network number and netmask for a device
Usage
#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);
Overview
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. errbuf is a buffer large enough to hold at least PCAP_ERRBUF_SIZE chars.
This function is not available on Windows. It supports neither IPv6 nor multiple IPv4 addresses per interface, which obviously is not practical in modern networks. See pcap_findalldevs(3) for a more elaborate solution to the problem.
Return value
pcap_lookupnet() returns 0 on success and PCAP_ERROR on failure. If PCAP_ERROR is returned, errbuf is filled in with an appropriate error message.
Releases
39 releases since FreeBSD 8.0-RELEASE; the text changed 9 times.