Logo Search packages:      
Sourcecode: wireshark version File versions  Download package

randpkt.c

/*
 * randpkt.c
 * ---------
 * Creates random packet traces. Useful for debugging sniffers by testing
 * assumptions about the veracity of the data found in the packet.
 *
 * $Id: randpkt.c 21945 2007-05-25 23:40:42Z gerald $
 *
 * Copyright (C) 1999 by Gilbert Ramirez <gram@alumni.rice.edu>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef NEED_GETOPT_H
#include "getopt.h"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#include <time.h>
#include <errno.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include "wiretap/wtap.h"

#define array_length(x) (sizeof x / sizeof x[0])

/* Types of produceable packets */
enum {
      PKT_ARP,
      PKT_BGP,
      PKT_BVLC,
      PKT_DNS,
      PKT_ETHERNET,
      PKT_FDDI,
      PKT_GIOP,
      PKT_ICMP,
      PKT_IP,
      PKT_LLC,
      PKT_M2M,
      PKT_MEGACO,
      PKT_NBNS,
      PKT_NCP2222,
      PKT_SCTP,
      PKT_SYSLOG,
      PKT_TCP,
      PKT_TDS,
      PKT_TR,
      PKT_UDP
};

typedef struct {
      const char  *abbrev;
      const char  *longname;
      int         produceable_type;
      guint8            *sample_buffer;
      int         sample_wtap_encap;
      int         sample_length;
} pkt_example;

/* Ethernet, indicating ARP */
guint8 pkt_arp[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x00, 0x00,
      0x32, 0x25, 0x0f, 0xff,
      0x08, 0x06
};

/* Ethernet+IP+UDP, indicating DNS */
guint8 pkt_dns[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x3c,
      0xc5, 0x9e, 0x40, 0x00,
      0xff, 0x11, 0xd7, 0xe0,
      0xd0, 0x15, 0x02, 0xb8,
      0x0a, 0x01, 0x01, 0x63,

      0x05, 0xe8, 0x00, 0x35,
      0xff, 0xff, 0x2a, 0xb9,
      0x30
};

/* Ethernet+IP, indicating ICMP */
guint8 pkt_icmp[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x54,
      0x8f, 0xb3, 0x40, 0x00,
      0xfd, 0x01, 0x8a, 0x99,
      0xcc, 0xfc, 0x66, 0x0b,
      0xce, 0x41, 0x62, 0x12
};

/* Ethernet, indicating IP */
guint8 pkt_ip[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00
};

/* TR, indicating LLC */
guint8 pkt_llc[] = {
      0x10, 0x40, 0x68, 0x00,
      0x19, 0x69, 0x95, 0x8b,
      0x00, 0x01, 0xfa, 0x68,
      0xc4, 0x67
};

/* Ethernet, indicating WiMAX M2M */
guint8 pkt_m2m[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x00, 0x00,
      0x32, 0x25, 0x0f, 0xff,
      0x08, 0xf0
};

/* Ethernet+IP+UDP, indicating NBNS */
guint8 pkt_nbns[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x3c,
      0xc5, 0x9e, 0x40, 0x00,
      0xff, 0x11, 0xd7, 0xe0,
      0xd0, 0x15, 0x02, 0xb8,
      0x0a, 0x01, 0x01, 0x63,

      0x00, 0x89, 0x00, 0x89,
      0x00, 0x00, 0x2a, 0xb9,
      0x30
};

/* Ethernet+IP+UDP, indicating syslog */
guint8 pkt_syslog[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x64,
      0x20, 0x48, 0x00, 0x00,
      0xfc, 0x11, 0xf8, 0x03,
      0xd0, 0x15, 0x02, 0xb8,
      0x0a, 0x01, 0x01, 0x63,

      0x05, 0xe8, 0x02, 0x02,
      0x00, 0x50, 0x51, 0xe1,
      0x3c
};

/* TR+LLC+IP, indicating TCP */
guint8 pkt_tcp[] = {
      0x10, 0x40, 0x68, 0x00,
      0x19, 0x69, 0x95, 0x8b,
      0x00, 0x01, 0xfa, 0x68,
      0xc4, 0x67,

      0xaa, 0xaa, 0x03, 0x00,
      0x00, 0x00, 0x08, 0x00,

      0x45, 0x00, 0x00, 0x28,
      0x0b, 0x0b, 0x40, 0x00,
      0x20, 0x06, 0x85, 0x37,
      0xc0, 0xa8, 0x27, 0x01,
      0xc0, 0xa8, 0x22, 0x3c
};

/* Ethernet+IP, indicating UDP */
guint8 pkt_udp[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x3c,
      0xc5, 0x9e, 0x40, 0x00,
      0xff, 0x11, 0xd7, 0xe0,
      0xd0, 0x15, 0x02, 0xb8,
      0x0a, 0x01, 0x01, 0x63
};

/* Ethernet+IP+UDP, indicating BVLC */
guint8 pkt_bvlc[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x3c,
      0xc5, 0x9e, 0x40, 0x00,
      0xff, 0x11, 0x01, 0xaa,
      0xc1, 0xff, 0x19, 0x1e,
      0xc1, 0xff, 0x19, 0xff,
      0xba, 0xc0, 0xba, 0xc0,
      0x00, 0xff, 0x2d, 0x5e,
      0x81
};

/* TR+LLC+IPX, indicating NCP, with NCP Type == 0x2222 */
guint8 pkt_ncp2222[] = {
      0x10, 0x40, 0x00, 0x00,
      0xf6, 0x7c, 0x9b, 0x70,
      0x68, 0x00, 0x19, 0x69,
      0x95, 0x8b, 0xe0, 0xe0,
      0x03, 0xff, 0xff, 0x00,
      0x25, 0x02, 0x11, 0x00,
      0x00, 0x74, 0x14, 0x00,
      0x00, 0x00, 0x00, 0x00,
      0x01, 0x04, 0x51, 0x00,
      0x00, 0x00, 0x04, 0x00,
      0x02, 0x16, 0x19, 0x7a,
      0x84, 0x40, 0x01, 0x22,
      0x22
};

/* Ethernet+IP+TCP, indicating GIOP */
guint8 pkt_giop[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0xa6,
      0x00, 0x2f, 0x40, 0x00,
      0x40, 0x06, 0x3c, 0x21,
      0x7f, 0x00, 0x00, 0x01,
      0x7f, 0x00, 0x00, 0x01,

      0x30, 0x39, 0x04, 0x05,
      0xac, 0x02, 0x1e, 0x69,
      0xab, 0x74, 0xab, 0x64,
      0x80, 0x18, 0x79, 0x60,
      0xc4, 0xb8, 0x00, 0x00,
      0x01, 0x01, 0x08, 0x0a,
      0x00, 0x00, 0x48, 0xf5,
      0x00, 0x00, 0x48, 0xf5,

      0x47, 0x49, 0x4f, 0x50,
      0x01, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x30,
      0x00, 0x00, 0x00, 0x00,
      0x00, 0x00, 0x00, 0x01,
      0x01
};

/* Ethernet+IP+TCP, indicating BGP */
guint8 pkt_bgp[] = {
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0x01, 0x01,
      0x01, 0x01, 0x01, 0x01,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0xa6,
      0x00, 0x2f, 0x40, 0x00,
      0x40, 0x06, 0x3c, 0x21,
      0x7f, 0x00, 0x00, 0x01,
      0x7f, 0x00, 0x00, 0x01,

      0x30, 0x39, 0x00, 0xb3,
      0xac, 0x02, 0x1e, 0x69,
      0xab, 0x74, 0xab, 0x64,
      0x80, 0x18, 0x79, 0x60,
      0xc4, 0xb8, 0x00, 0x00,
      0x01, 0x01, 0x08, 0x0a,
      0x00, 0x00, 0x48, 0xf5,
      0x00, 0x00, 0x48, 0xf5,

      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff,
      0xff, 0xff, 0xff, 0xff,
};

/* Ethernet+IP+TCP, indicating TDS NetLib */
guint8 pkt_tds[] = {
      0x00, 0x50, 0x8b, 0x0d,
      0x7a, 0xed, 0x00, 0x08,
      0xa3, 0x98, 0x39, 0x81,
      0x08, 0x00,

      0x45, 0x00, 0x03, 0x8d,
      0x90, 0xd4, 0x40, 0x00,
      0x7c, 0x06, 0xc3, 0x1b,
      0xac, 0x14, 0x02, 0x22,
      0x0a, 0xc2, 0xee, 0x82,

      0x05, 0x99, 0x08, 0xf8,
      0xff, 0x4e, 0x85, 0x46,
      0xa2, 0xb4, 0x42, 0xaa,
      0x50, 0x18, 0x3c, 0x28,
      0x0f, 0xda, 0x00, 0x00,
};

/* Ethernet+IP, indicating SCTP */
guint8 pkt_sctp[] = {
      0x00, 0xa0, 0x80, 0x00,
      0x5e, 0x46, 0x08, 0x00,
      0x03, 0x4a, 0x00, 0x35,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x7c,
      0x14, 0x1c, 0x00, 0x00,
      0x3b, 0x84, 0x4a, 0x54,
      0x0a, 0x1c, 0x06, 0x2b,
      0x0a, 0x1c, 0x06, 0x2c,
};


/* Ethernet+IP+SCTP, indicating MEGACO */
guint8 pkt_megaco[] = {
      0x00, 0xa0, 0x80, 0x00,
      0x5e, 0x46, 0x08, 0x00,
      0x03, 0x4a, 0x00, 0x35,
      0x08, 0x00,

      0x45, 0x00, 0x00, 0x7c,
      0x14, 0x1c, 0x00, 0x00,
      0x3b, 0x84, 0x4a, 0x54,
      0x0a, 0x1c, 0x06, 0x2b,
      0x0a, 0x1c, 0x06, 0x2c,

      0x40, 0x00, 0x0b, 0x80,
      0x00, 0x01, 0x6f, 0x0a,
      0x6d, 0xb0, 0x18, 0x82,
      0x00, 0x03, 0x00, 0x5b,
      0x28, 0x02, 0x43, 0x45,
      0x00, 0x00, 0xa0, 0xbd,
      0x00, 0x00, 0x00, 0x07,
};

/* This little data table drives the whole program */
pkt_example examples[] = {
      { "arp", "Address Resolution Protocol",
            PKT_ARP,    pkt_arp,    WTAP_ENCAP_ETHERNET,    array_length(pkt_arp) },

      { "bgp", "Border Gateway Protocol",
            PKT_BGP,    pkt_bgp,    WTAP_ENCAP_ETHERNET,    array_length(pkt_bgp) },

      { "bvlc", "BACnet Virtual Link Control",
            PKT_BVLC,   pkt_bvlc,   WTAP_ENCAP_ETHERNET,    array_length(pkt_bvlc) },

      { "dns", "Domain Name Service",
            PKT_DNS,    pkt_dns,    WTAP_ENCAP_ETHERNET,    array_length(pkt_dns) },

      { "eth", "Ethernet",
            PKT_ETHERNET,     NULL,       WTAP_ENCAP_ETHERNET,    0 },

      { "fddi", "Fiber Distributed Data Interface",
            PKT_FDDI,   NULL,       WTAP_ENCAP_FDDI,  0 },

      { "giop", "General Inter-ORB Protocol",
            PKT_GIOP,   pkt_giop,   WTAP_ENCAP_ETHERNET,    array_length(pkt_giop) },

      { "icmp", "Internet Control Message Protocol",
            PKT_ICMP,   pkt_icmp,   WTAP_ENCAP_ETHERNET,    array_length(pkt_icmp) },

      { "ip", "Internet Protocol",
            PKT_IP,           pkt_ip,           WTAP_ENCAP_ETHERNET,    array_length(pkt_ip) },

      { "llc", "Logical Link Control",
            PKT_LLC,    pkt_llc,    WTAP_ENCAP_TOKEN_RING,  array_length(pkt_llc) },

      { "m2m", "WiMAX M2M Encapsulation Protocol",
            PKT_M2M,    pkt_m2m,    WTAP_ENCAP_ETHERNET,    array_length(pkt_m2m) },

      { "megaco", "MEGACO",
            PKT_MEGACO, pkt_megaco, WTAP_ENCAP_ETHERNET,    array_length(pkt_megaco) },

      { "nbns", "NetBIOS-over-TCP Name Service",
            PKT_NBNS,   pkt_nbns,   WTAP_ENCAP_ETHERNET,    array_length(pkt_nbns) },

      { "ncp2222", "NetWare Core Protocol",
            PKT_NCP2222,      pkt_ncp2222,      WTAP_ENCAP_TOKEN_RING,  array_length(pkt_ncp2222) },

      { "sctp", "Stream Control Transmission Protocol",
            PKT_SCTP,   pkt_sctp,   WTAP_ENCAP_ETHERNET,    array_length(pkt_sctp) },

      { "syslog", "Syslog message",
            PKT_SYSLOG, pkt_syslog, WTAP_ENCAP_ETHERNET,    array_length(pkt_syslog) },

      { "tds", "TDS NetLib",
            PKT_TDS,    pkt_tds,    WTAP_ENCAP_ETHERNET,    array_length(pkt_tds) },

      { "tcp", "Transmission Control Protocol",
            PKT_TCP,    pkt_tcp,    WTAP_ENCAP_TOKEN_RING,  array_length(pkt_tcp) },

      { "tr",      "Token-Ring",
            PKT_TR,           NULL,       WTAP_ENCAP_TOKEN_RING,  0 },

      { "udp", "User Datagram Protocol",
            PKT_UDP,    pkt_udp,    WTAP_ENCAP_ETHERNET,    array_length(pkt_udp) },

};



static int parse_type(char *string);
static void usage(void);
static void seed(void);

static pkt_example* find_example(int type);

int
main(int argc, char **argv)
{

      wtap_dumper       *dump;
      struct wtap_pkthdr      pkthdr;
      union wtap_pseudo_header      ps_header;
      int               i, j, len_this_pkt, len_random, err;
      guint8                  buffer[65536];

      int               opt;
      extern char       *optarg;
      extern int        optind;

      int               produce_count = 1000; /* number of pkts to produce */
      int               produce_type = PKT_ETHERNET;
      char              *produce_filename = NULL;
      int               produce_max_bytes = 5000;
      pkt_example       *example;

      while ((opt = getopt(argc, argv, "b:c:t:")) != -1) {
            switch (opt) {
                  case 'b':   /* max bytes */
                        produce_max_bytes = atoi(optarg);
                        if (produce_max_bytes > 65536) {
                              printf("Max bytes is 65536\n");
                              exit(0);
                        }
                        break;

                  case 'c':   /* count */
                        produce_count = atoi(optarg);
                        break;

                  case 't':   /* type of packet to produce */
                        produce_type = parse_type(optarg);
                        break;

                  default:
                        usage();
                        break;
            }
      }

      /* any more command line parameters? */
      if (argc > optind) {
            produce_filename = argv[optind];
      }
      else {
            usage();
      }

      example = find_example(produce_type);

      pkthdr.ts.secs = 0;
      pkthdr.ts.nsecs = 0;
      pkthdr.pkt_encap = example->sample_wtap_encap;

      dump = wtap_dump_open(produce_filename, WTAP_FILE_PCAP,
            example->sample_wtap_encap, produce_max_bytes, FALSE /* compressed */, &err);
    if (!dump) {
        printf("Error writing to %s\n", produce_filename);
        exit(1);
    }

      seed();

      /* reduce max_bytes by # of bytes already in sample */
      if (produce_max_bytes <= example->sample_length) {
            printf("Sample packet length is %d, which is greater than or equal to\n", example->sample_length);
            printf("your requested max_bytes value of %d\n", produce_max_bytes);
            exit(0);
      }
      else {
            produce_max_bytes -= example->sample_length;
      }

      /* Load the sample into our buffer */
      if (example->sample_buffer)
            memcpy(&buffer[0], example->sample_buffer, example->sample_length);

      /* Produce random packets */
      for (i = 0; i < produce_count; i++) {
            if (produce_max_bytes > 0) {
                  len_random = (rand() % produce_max_bytes + 1);
            }
            else {
                  len_random = 0;
            }

            len_this_pkt = example->sample_length + len_random;

            pkthdr.caplen = len_this_pkt;
            pkthdr.len = len_this_pkt;
            pkthdr.ts.secs = i; /* just for variety */

            for (j = example->sample_length; j < len_this_pkt; j++) {
                  /* Add format strings here and there */
                  if ((int) (100.0*rand()/(RAND_MAX+1.0)) < 3 && j < (len_random - 3)) {
                        memcpy(&buffer[j], "%s", 3);
                        j += 2;
                  } else {
                        buffer[j] = (rand() % 0x100);
                  }
            }

            wtap_dump(dump, &pkthdr, &ps_header, &buffer[0], &err);
      }

      wtap_dump_close(dump, &err);

      return 0;

}

/* Print usage statement and exit program */
static
void usage(void)
{
      int   num_entries = array_length(examples);
      int   i;

      printf("Usage: randpkt [-b maxbytes] [-c count] [-t type] filename\n");
      printf("Default max bytes (per packet) is 5000\n");
      printf("Default count is 1000.\n");
      printf("Types:\n");

      for (i = 0; i < num_entries; i++) {
            printf("\t%s\t%s\n", examples[i].abbrev, examples[i].longname);
      }

      printf("\n");

      exit(0);
}

/* Parse command-line option "type" and return enum type */
static
int parse_type(char *string)
{
      int   num_entries = array_length(examples);
      int   i;

      for (i = 0; i < num_entries; i++) {
            if (strcmp(examples[i].abbrev, string) == 0) {
                  return examples[i].produceable_type;
            }
      }

      /* Complain */
      printf("Type %s not known.\n", string);
      exit(1);
}

/* Find pkt_example record and return pointer to it */
static
pkt_example* find_example(int type)
{
      int   num_entries = array_length(examples);
      int   i;

      for (i = 0; i < num_entries; i++) {
            if (examples[i].produceable_type == type) {
                  return &examples[i];
            }
      }

      printf("Internal error. Type %d has no entry in examples table.\n", type);
      exit(1);
}

/* Seed the random-number generator */
void
seed(void)
{
      unsigned int      randomness;

#if defined(linux)
      /* Okay, I should use #ifdef HAVE_DEV_RANDOM, but this is a quick hack */
      int         fd;

      fd = open("/dev/random", O_RDONLY);
      if (fd < 0) {
            printf("Could not open /dev/random for reading: %s\n", strerror(errno));
            exit(0);
      }

      read(fd, &randomness, sizeof(randomness));
#else
      time_t now;

      now = time(NULL);
      randomness = (unsigned int) now;
#endif

      srand(randomness);
}

Generated by  Doxygen 1.6.0   Back to index