libpcap pcap_findalldevs 获取网卡设备列表

函数原型：
int    pcap_findalldevs(pcap_if_t **, char *);

returns 0 on success and -1 on failure.

/*
 * Item in a list of interfaces.
 */
struct pcap_if {
	struct pcap_if *next;
	char *name;		/* name to hand to "pcap_open_live()" */
	char *description;	/* textual description of interface, or NULL */
	struct pcap_addr *addresses;
	bpf_u_int32 flags;	/* PCAP_IF_ interface flags */
};
typedef struct pcap_if pcap_if_t;

#include <pcap/pcap.h>
void CCapture::findDev()
{
    char buf[1024];
    pcap_if_t *allDev;
    pcap_findalldevs(&allDev, buf);

    for (pcap_if_t *pdev = allDev; pdev; pdev=pdev->next)
    {
        cout<<"@:"<<pdev->name<<endl;
    }
    pcap_freealldevs(allDev);
}
int main(int argc, char *argv[])
{
    CCapture capt;
    capt.findDev();
    return 1;
}

g++ main.cpp capture.cpp -lpcap -o testcap