ubuntu - pcap_lookupdev() 已弃用 l。如何解决

Question

由于在 libcap >=1.9 中已弃用 lookupdev，因此我在使用 v1.8 编写的代码时遇到错误。我无法解决它。
建议我使用 pcap_findalldevs 但我收到错误消息。

int sniffARPPackets(char* gateway, char* gateway_ipp)

{

strncpy(gtwy, gateway, 17);
strncpy(gateway_ip, gateway_ipp, 15);
int i;
char *dev;
char errbuf[PCAP_ERRBUF_SIZE];
pcap_t* descr;
const u_char *packet;
struct pcap_pkthdr hdr;
struct ether_header *eptr;
struct bpf_program fp;
bpf_u_int32 maskp;
bpf_u_int32 netp;

dev = pcap_lookupdev(errbuf);

if(dev == NULL) {
    fprintf(stderr, "%s\n", errbuf);
    exit(1);
}

pcap_lookupnet(dev, &netp, &maskp, errbuf);


descr = pcap_open_live(dev, BUFSIZ, 1,-1, errbuf);
if(descr == NULL) {
    printf("pcap_open_live(): %s\n", errbuf);
    exit(1);
}


if(pcap_compile(descr, &fp, "arp", 0, netp) == -1) {
    fprintf(stderr, "Error calling pcap_compile\n");
    exit(1);
}


if(pcap_setfilter(descr, &fp) == -1) {
    fprintf(stderr, "Error setting filter\n");
    exit(1);
}


pcap_loop(descr, -1, my_callback, NULL);
return 0;

}
这是代码。

Answer 1

为什么它被弃用？
引用 pcap_lookupdev 手册页:

BUGS
   The pointer returned by pcap_lookupdev() points  to  a  static  buffer;
   subsequent  calls  to  pcap_lookupdev() in the same thread, or calls to
   pcap_lookupdev() in another thread, may overwrite that buffer.

   In WinPcap, this function may return a UTF-16  string  rather  than  an
   ASCII or UTF-8 string.

你应该怎么做？
引用 pcap_lookupdev 手册页:

DESCRIPTION
   This  interface  is  obsoleted  by  pcap_findalldevs(3PCAP).  To find a
   default device on which to capture, call pcap_findalldevs() and, if the
   list  it  returns  is not empty, use the first device in the list.  (If
   the list is empty, there are no devices on which capture is  possible.)

在除 Windows 之外的所有平台上， pcap_lookupdev()来电 pcap_findalldevs()并返回第一个设备(除非它是环回设备)，所以如果 pcap_findalldevs()不工作， pcap_lookupdev()也不会工作。您在使用 pcap_findalldevs() 时遇到什么错误？ ?