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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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PCAP_LOOKUPNET(3PCAP) PCAP_LOOKUPNET(3PCAP)
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. 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(3PCAP)
for a more elaborate solution to the problem.
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.
pcap(3PCAP)
This page is part of the libpcap (packet capture library)
project. Information about the project can be found at
⟨http://www.tcpdump.org/⟩. If you have a bug report for this
manual page, see ⟨http://www.tcpdump.org/#patches⟩. This page
was obtained from the project's upstream Git repository
⟨https://github.com/the-tcpdump-group/libpcap.git⟩ on 2024-06-14.
(At that time, the date of the most recent commit that was found
in the repository was 2024-06-04.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
13 March 2024 PCAP_LOOKUPNET(3PCAP)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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