不推荐使用pcap_lookupdev如何解决

如何解决不推荐使用pcap_lookupdev如何解决

由于在libcap> = 1.9中不建议使用lookupdev，所以我在用v1.8编写的代码上遇到错误。我无法解决它。建议是我使用pcap_findalldevs，但出现错误。

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",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,my_callback,NULL);
return 0;

}

这是代码。

解决方法

为什么不推荐使用它？

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.

您应该怎么做？

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Windows以外的所有平台上，pcap_lookupdev()调用pcap_findalldevs()并返回第一个设备（除非它是回送设备），因此如果pcap_findalldevs()不起作用，则{{1} }也不起作用。 pcap_lookupdev()出现什么错误？