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#include "pcap.h"

void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);

int main()

{

pcap_if_t *alldevs;

pcap_if_t *d;

int inum;

int i=0;

pcap_t *adhandle;

char errbuf[PCAP_ERRBUF_SIZE];

if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)

{

fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);

exit(1);

}

for(d=alldevs; d; d=d->next)

{

printf("%d. %s", ++i, d->name);

if (d->description)

printf(" (%s)\n", d->description);

else

printf(" (No description available)\n");

}

if(i==0)

{

printf("\nNo interfaces found! Make sure WinPcap is installed.\n");

return -1;

}

printf("Enter the interface number (1-%d):",i);

scanf_s("%d", &inum);

if(inum < 1 || inum > i)

{

printf("\nInterface number out of range.\n");

pcap_freealldevs(alldevs);

return -1;

}

for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);

if ( (adhandle= pcap_open(d->name, // name of the device

65536, // portion of the packet to capture

// 65536 guarantees that the whole packet will be captured on all the link layers

PCAP_OPENFLAG_PROMISCUOUS, // promiscuous mode

1000, // read timeout

NULL, // authentication on the remote machine

errbuf // error buffer

) ) == NULL)

{

fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);

pcap_freealldevs(alldevs);

return -1;

}

printf("\nlistening on %s

\n", d->description);

pcap_freealldevs(alldevs);

pcap_loop(adhandle, 0, packet_handler, NULL);

return 0;

}

void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)

{

struct tm ltime;

char timestr[16];

time_t local_tv_sec;

(VOID)(param);

(VOID)(pkt_data);

local_tv_sec = header->ts.tv_sec;

localtime_s(&ltime, &local_tv_sec);

strftime( timestr, sizeof timestr, "%H:%M:%S", &ltime);

printf("%s,%.6d len:%d\n", timestr, header->ts.tv_usec, header->len);

}

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-1 is returned on an error; 0 is returned if cnt is exhausted; -2 is returned if the loop terminated due to a call to pcap_breakloop() before any packets were processed. If your application uses pcap_breakloop(), make sure that you explicitly check for -1 and -2, rather than just checking for a return value < 0.

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pcap_t* pcap_open  ( const char *  source,
  int  snaplen,
  int  flags,
  int  read_timeout,  //灝辨槸榪欎釜璁劇疆瓚呮椂浜嗭紝鍗曚綅鏄縐?br />  struct pcap_rmtauth *  auth,
  char *  errbuf
)

typedef void(* pcap_handler)(u_char *user, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data)

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