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#include <stdio.h>
#include <pcap.h>
#define LINE_LEN 16
int main(int argc, char **argv)
{
pcap_t *fp;
char errbuf[PCAP_ERRBUF_SIZE];
struct pcap_pkthdr *header;
const u_char *pkt_data;
u_int i=0;
int res;
if(argc != 2)
{
printf("usage: %s filename", argv[0]);
return -1;
}
/* Open the capture file */
if ((fp = pcap_open_offline(argv[1], // name of the device
errbuf // error buffer
)) == NULL)
{
fprintf(stderr,"\nUnable to open the file %s.\n", argv[1]);
return -1;
}
/* Retrieve the packets from the file */
while((res = pcap_next_ex(fp, &header, &pkt_data)) >= 0)
{
/* print pkt timestamp and pkt len */
printf("%ld:%ld (%ld)\n", header->ts.tv_sec, header->ts.tv_usec, header->len);
/* Print the packet */
for (i=1; (i < header->caplen + 1 ) ; i++)
{
printf("%.2x ", pkt_data[i-1]);
if ( (i % LINE_LEN) == 0) printf("\n");
}
printf("\n\n");
}
if (res == -1)
{
printf("Error reading the packets: %s\n", pcap_geterr(fp));
}
pcap_close(fp);
return 0;
}
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