91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
#include <stdio.h>
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#include <pcap.h>
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#define LINE_LEN 16
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#ifdef WIN32
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#include <tchar.h>
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BOOL LoadNpcapDlls()
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{
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_TCHAR npcap_dir[512];
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UINT len;
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len = GetSystemDirectory(npcap_dir, 480);
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if (!len) {
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fprintf(stderr, "Error in GetSystemDirectory: %x", GetLastError());
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return FALSE;
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}
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_tcscat_s(npcap_dir, 512, _T("\\Npcap"));
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if (SetDllDirectory(npcap_dir) == 0) {
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fprintf(stderr, "Error in SetDllDirectory: %x", GetLastError());
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return FALSE;
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}
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return TRUE;
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}
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#endif
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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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#ifdef WIN32
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/* Load Npcap and its functions. */
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if (!LoadNpcapDlls())
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{
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fprintf(stderr, "Couldn't load Npcap\n");
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exit(1);
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}
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#endif
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if(argc != 2)
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{
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printf("usage: %s filename", argv[0]);
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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_offline(argv[1], // name of the device
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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", argv[1]);
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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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pcap_close(fp);
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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,
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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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