101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
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#include "pcap.h"
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/* prototype of the packet handler */
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void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data);
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int main()
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{
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pcap_if_t *alldevs;
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pcap_if_t *d;
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int inum;
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int i=0;
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pcap_t *adhandle;
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char errbuf[PCAP_ERRBUF_SIZE];
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/* Retrieve the device list on the local machine */
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if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
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{
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fprintf(stderr,"Error in pcap_findalldevs: %s\n", errbuf);
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exit(1);
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}
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/* Print the list */
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for(d=alldevs; d; d=d->next)
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{
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printf("%d. %s", ++i, d->name);
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if (d->description)
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printf(" (%s)\n", d->description);
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else
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printf(" (No description available)\n");
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}
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if(i==0)
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{
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printf("\nNo interfaces found! Make sure WinPcap is installed.\n");
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return -1;
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}
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printf("Enter the interface number (1-%d):",i);
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scanf_s("%d", &inum);
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if(inum < 1 || inum > i)
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{
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printf("\nInterface number out of range.\n");
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/* Free the device list */
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pcap_freealldevs(alldevs);
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return -1;
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}
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/* Jump to the selected adapter */
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for(d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
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/* Open the device */
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if ( (adhandle= pcap_open(d->name, // name of the device
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65536, // portion of the packet to capture
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// 65536 guarantees that the whole packet will be captured on all the link layers
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PCAP_OPENFLAG_PROMISCUOUS, // promiscuous mode
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1000, // read timeout
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NULL, // authentication on the remote machine
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errbuf // error buffer
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) ) == NULL)
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{
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fprintf(stderr,"\nUnable to open the adapter. %s is not supported by WinPcap\n", d->name);
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/* Free the device list */
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pcap_freealldevs(alldevs);
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return -1;
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}
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printf("\nlistening on %s...\n", d->description);
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/* At this point, we don't need any more the device list. Free it */
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pcap_freealldevs(alldevs);
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/* start the capture */
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pcap_loop(adhandle, 0, packet_handler, NULL);
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return 0;
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}
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/* Callback function invoked by libpcap for every incoming packet */
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void packet_handler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data)
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{
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struct tm ltime;
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char timestr[16];
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time_t local_tv_sec;
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/*
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* unused variables
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*/
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(VOID)(param);
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(VOID)(pkt_data);
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/* convert the timestamp to readable format */
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local_tv_sec = header->ts.tv_sec;
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localtime_s(<ime, &local_tv_sec);
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strftime( timestr, sizeof timestr, "%H:%M:%S", <ime);
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printf("%s,%.6d len:%d\n", timestr, header->ts.tv_usec, header->len);
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}
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