pcap_lookupnet.3pcap man page

pcap_lookupnet — find the IPv4 network number and netmask for a device


#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);


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



3 January 2014