PCAP_LOOKUPNET(3PCAP)

okay so bestie, welcome to the PCAP_LOOKUPNET(3PCAP) page 💅✨ it’s literally all about one function and we’re gonna get you comfy with it.

🌸 NAME 🌸

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

✨ SYNOPSIS ✨

first, the receipts 📜:

#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 🦋

okay so 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, and errbuf is a buffer large enough to hold at least PCAP_ERRBUF_SIZE chars 💖

Windows girlies, this one is not available on Windows 🙈

it supports neither IPv6 nor multiple IPv4 addresses per interface, which obviously is not practical in modern networks 😭 for a more elaborate solution to the problem, see pcap_findalldevs(3PCAP) 🫶

💀 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(3PCAP)

okay that’s the whole page, bestie 🫶 this one’s from the PCAP_LOOKUPNET(3PCAP) manual, dated 13 March 2024 — mwah 💋💖