79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
#include <stdio.h>
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#include <pcap.h>
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#define LINE_LEN 16
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void dispatcher_handler(u_char *, const struct pcap_pkthdr *, const u_char *);
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int main(int argc, char **argv)
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{
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pcap_t *fp;
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char errbuf[PCAP_ERRBUF_SIZE];
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char source[PCAP_BUF_SIZE];
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if(argc != 2){
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printf("usage: %s filename", argv[0]);
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return -1;
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}
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/* Create the source string according to the new WinPcap syntax */
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if ( pcap_createsrcstr( source, // variable that will keep the source string
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PCAP_SRC_FILE, // we want to open a file
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NULL, // remote host
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NULL, // port on the remote host
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argv[1], // name of the file we want to open
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errbuf // error buffer
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) != 0)
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{
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fprintf(stderr,"\nError creating a source string\n");
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return -1;
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}
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/* Open the capture file */
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if ( (fp= pcap_open(source, // 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 file %s.\n", source);
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return -1;
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}
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// read and dispatch packets until EOF is reached
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pcap_loop(fp, 0, dispatcher_handler, NULL);
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return 0;
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}
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void dispatcher_handler(u_char *temp1,
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const struct pcap_pkthdr *header, const u_char *pkt_data)
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{
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u_int i=0;
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/*
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* Unused variable
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*/
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(VOID)temp1;
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/* print pkt timestamp and pkt len */
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printf("%ld:%ld (%ld)\n", header->ts.tv_sec, header->ts.tv_usec, header->len);
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/* Print the packet */
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for (i=1; (i < header->caplen + 1 ) ; i++)
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{
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printf("%.2x ", pkt_data[i-1]);
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if ( (i % LINE_LEN) == 0) printf("\n");
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}
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printf("\n\n");
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}
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