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PCAP_LOOKUPNET(3) Library Functions Manual PCAP_LOOKUPNET(3) 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. 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 prac- tical 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. SEE ALSO pcap(3) 13 March 2024 PCAP_LOOKUPNET(3)