test-libpcap.c

   1 /*
   2  * Focused test app to enable checking of libpcap with valgrind
   3  *
   4  * Build with: $ gcc -W -Wall -g test-libpcap.c -lpcap -o test-libpcap
   5  */
   6
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10 #include <pcap.h>
  11 #include <netinet/in.h>
  12
  13 int main(int argc, char **argv) {
  14         pcap_t *descr=NULL;
  15         char *dev = NULL, *device="eth1";
  16         pcap_if_t *this_dev, *alldevsp;
  17         char *pcap_filter = "tcp port 80";
  18         char errbuf[PCAP_ERRBUF_SIZE];
  19         struct bpf_program fp;
  20
  21         printf("Starting %s with %d arguments\n", argv[0], argc );
  22         printf("Using %s\n", pcap_lib_version());
  23         printf("Device %s wanted\n", device);
  24
  25         printf("calling pcap_findalldevs()\n");
  26         if (pcap_findalldevs(&alldevsp, errbuf) == 0) {
  27          printf("pcap_findalldevs() done.\n");
  28          this_dev = alldevsp;
  29          printf("while()\n");
  30          while (this_dev != NULL) {
  31           printf("device %s\n",this_dev->name);
  32           if (strcmp(device, this_dev->name) == 0) {
  33            dev = this_dev->name;
  34            break;
  35           }
  36           this_dev = this_dev->next;
  37          }
  38         }
  39         else {
  40          fprintf(stderr, "Error: pcap_findalldevs()\n");
  41         }
  42         this_dev =NULL;
  43         pcap_freealldevs(alldevsp); // free list memory
  44
  45         dev = pcap_lookupdev(errbuf);
  46         printf("pcap_lookupdev() done\n");
  47         if (dev != NULL) {
  48                 descr = pcap_open_live(dev, BUFSIZ, 0, 1024, errbuf);
  49                 printf("pcap_open_live() done\n");
  50                 if (descr != NULL) {
  51                         if(pcap_compile(descr, &fp, pcap_filter, 0, htonl(0xFFFF0000)) != -1)   {
  52                                   printf("pcap_compile() done\n");
  53                                   if(pcap_setfilter(descr, &fp) == 0) {
  54                                           printf("pcap_setfilter() done\n");
  55                                   }
  56                                   pcap_freecode(&fp);
  57                         }
  58                         pcap_close(descr);
  59                 }
  60                 dev=NULL;
  61         }
  62
  63         printf("Finished\n");
  64         return 0;
  65 }