/*
* 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);
}
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