winpcap/Examples/pktdump_ex/pktdump_ex.c

   1 /*
   2  * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
   3  * Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  * notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  * notice, this list of conditions and the following disclaimer in the
  14  * documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the Politecnico di Torino, CACE Technologies
  16  * nor the names of its contributors may be used to endorse or promote
  17  * products derived from this software without specific prior written
  18  * permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  *
  32  */
  33
  34
  35 #include <stdlib.h>
  36 #include <stdio.h>
  37
  38 //
  39 // NOTE: remember to include WPCAP and HAVE_REMOTE among your
  40 // preprocessor definitions.
  41 //
  42
  43 #include <pcap.h>
  44
  45 #define LINE_LEN 16
  46
  47 main(int argc, char **argv)
  48 {
  49 pcap_if_t *alldevs, *d;
  50 pcap_t *fp;
  51 u_int inum, i=0;
  52 char errbuf[PCAP_ERRBUF_SIZE];
  53 int res;
  54 struct pcap_pkthdr *header;
  55 const u_char *pkt_data;
  56
  57         printf("pktdump_ex: prints the packets of the network using WinPcap.\n");
  58         printf("   Usage: pktdump_ex [-s source]\n\n"
  59                    "   Examples:\n"
  60                    "      pktdump_ex -s file://c:/temp/file.acp\n"
  61                    "      pktdump_ex -s rpcap://\\Device\\NPF_{C8736017-F3C3-4373-94AC-9A34B7DAD998}\n\n");
  62
  63         if(argc < 3)
  64         {
  65
  66                 printf("\nNo adapter selected: printing the device list:\n");
  67                 /* The user didn't provide a packet source: Retrieve the local device list */
  68                 if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
  69                 {
  70                         fprintf(stderr,"Error in pcap_findalldevs_ex: %s\n", errbuf);
  71                         return -1;
  72                 }
  73
  74                 /* Print the list */
  75                 for(d=alldevs; d; d=d->next)
  76                 {
  77                         printf("%d. %s\n    ", ++i, d->name);
  78
  79                         if (d->description)
  80                                 printf(" (%s)\n", d->description);
  81                         else
  82                                 printf(" (No description available)\n");
  83                 }
  84
  85                 if (i==0)
  86                 {
  87                         fprintf(stderr,"No interfaces found! Exiting.\n");
  88                         return -1;
  89                 }
  90
  91                 printf("Enter the interface number (1-%d):",i);
  92                 scanf("%d", &inum);
  93
  94                 if (inum < 1 || inum > i)
  95                 {
  96                         printf("\nInterface number out of range.\n");
  97
  98                         /* Free the device list */
  99                         pcap_freealldevs(alldevs);
 100                         return -1;
 101                 }
 102
 103                 /* Jump to the selected adapter */
 104                 for (d=alldevs, i=0; i< inum-1 ;d=d->next, i++);
 105
 106                 /* Open the device */
 107                 if ( (fp= pcap_open(d->name,
 108                                                         100 /*snaplen*/,
 109                                                         PCAP_OPENFLAG_PROMISCUOUS /*flags*/,
 110                                                         20 /*read timeout*/,
 111                                                         NULL /* remote authentication */,
 112                                                         errbuf)
 113                                                         ) == NULL)
 114                 {
 115                         fprintf(stderr,"\nError opening adapter\n");
 116                         return -1;
 117                 }
 118         }
 119         else
 120         {
 121                 // Do not check for the switch type ('-s')
 122                 if ( (fp= pcap_open(argv[2],
 123                                                         100 /*snaplen*/,
 124                                                         PCAP_OPENFLAG_PROMISCUOUS /*flags*/,
 125                                                         20 /*read timeout*/,
 126                                                         NULL /* remote authentication */,
 127                                                         errbuf)
 128                                                         ) == NULL)
 129                 {
 130                         fprintf(stderr,"\nError opening source: %s\n", errbuf);
 131                         return -1;
 132                 }
 133         }
 134
 135         /* Read the packets */
 136         while((res = pcap_next_ex( fp, &header, &pkt_data)) >= 0)
 137         {
 138
 139                 if(res == 0)
 140                         /* Timeout elapsed */
 141                         continue;
 142
 143                 /* print pkt timestamp and pkt len */
 144                 printf("%ld:%ld (%ld)\n", header->ts.tv_sec, header->ts.tv_usec, header->len);
 145
 146                 /* Print the packet */
 147                 for (i=1; (i < header->caplen + 1 ) ; i++)
 148                 {
 149                         printf("%.2x ", pkt_data[i-1]);
 150                         if ( (i % LINE_LEN) == 0) printf("\n");
 151                 }
 152
 153                 printf("\n\n");
 154         }
 155
 156         if(res == -1)
 157         {
 158                 fprintf(stderr, "Error reading the packets: %s\n", pcap_geterr(fp));
 159                 return -1;
 160         }
 161
 162         return 0;
 163 }