06-24-2008
- How do you genarate $iplist and $rdnslist
- what occurrences do you want to count?
Can you also give exact output you want.
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LEARN ABOUT SUSE
pcap_findalldevs
PCAP_FINDALLDEVS(3PCAP) PCAP_FINDALLDEVS(3PCAP)
NAME
pcap_findalldevs, pcap_freealldevs - get a list of capture devices, and free that list
SYNOPSIS
#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];
int pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf);
void pcap_freealldevs(pcap_if_t *alldevs);
DESCRIPTION
pcap_findalldevs() constructs a list of network devices that can be opened with pcap_create() and pcap_activate() or with pcap_open_live().
(Note that there may be network devices that cannot be opened by the process calling pcap_findalldevs(), because, for example, that process
does not have sufficient privileges to open them for capturing; if so, those devices will not appear on the list.) If pcap_findalldevs()
succeeds, the pointer pointed to by alldevsp is set to point to the first element of the list, or to NULL if no devices were found (this is
considered success). Each element of the list is of type pcap_if_t, and has the following members:
next if not NULL, a pointer to the next element in the list; NULL for the last element of the list
name a pointer to a string giving a name for the device to pass to pcap_open_live()
description
if not NULL, a pointer to a string giving a human-readable description of the device
addresses
a pointer to the first element of a list of network addresses for the device, or NULL if the device has no addresses
flags device flags:
PCAP_IF_LOOPBACK
set if the device is a loopback interface
Each element of the list of addresses is of type pcap_addr_t, and has the following members:
next if not NULL, a pointer to the next element in the list; NULL for the last element of the list
addr a pointer to a struct sockaddr containing an address
netmask
if not NULL, a pointer to a struct sockaddr that contains the netmask corresponding to the address pointed to by addr
broadaddr
if not NULL, a pointer to a struct sockaddr that contains the broadcast address corresponding to the address pointed to by
addr; may be null if the device doesn't support broadcasts
dstaddr
if not NULL, a pointer to a struct sockaddr that contains the destination address corresponding to the address pointed to by
addr; may be null if the device isn't a point-to-point interface
Note that the addresses in the list of addresses might be IPv4 addresses, IPv6 addresses, or some other type of addresses, so you must
check the sa_family member of the struct sockaddr before interpreting the contents of the address; do not assume that the addresses are all
IPv4 addresses, or even all IPv4 or IPv6 addresses. IPv4 addresses have the value AF_INET, IPv6 addresses have the value AF_INET6 (which
older operating systems that don't support IPv6 might not define), and other addresses have other values. Whether other addresses are
returned, and what types they might have is platform-dependent. For IPv4 addresses, the struct sockaddr pointer can be interpreted as if
it pointed to a struct sockaddr_in; for IPv6 addresses, it can be interpreted as if it pointed to a struct sockaddr_in6.
The list of devices must be freed with pcap_freealldevs(), whch frees the list pointed to by alldevs.
RETURN VALUE
pcap_findalldevs() returns 0 on success and -1 on failure; as indicated, finding no devices is considered success, rather than failure, so
0 will be returned in that case. 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
pcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), pcap_open_live(3PCAP)
22 August 2010 PCAP_FINDALLDEVS(3PCAP)