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#include <pcap/pcap.h>
char errbuf[PCAP_ERRBUF_SIZE];int pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf);
DESCRIPTIONpcap_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 might not have sufficient privileges to open them for capturing; if so, those devices will not appear on the list.) alldevsp is set to point to the first element of the list; 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 addresses for the interface
flags interface flags:
PCAP_IF_LOOPBACK set if the interface 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 interface 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 interface isn't a point-to-point interface
Note that not all the addresses in the list of addresses are necessarily IPv4 or IPv6 addresses - you must check the sa_family member of the "struct sockaddr" before interpreting the contents of the address.
The list of devices must be freed with pcap_freealldevs() .
RETURN VALUEpcap_findalldevs() 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 ALSOpcap(3PCAP), pcap_create(3PCAP), pcap_activate(3PCAP), pcap_open_live(3PCAP), pcap_freealldevs(3PCAP)