/*
* $Id: nemesis-ip.c,v 1.1.1.1 2003/10/31 21:29:37 jnathan Exp $
*
* THE NEMESIS PROJECT
* Copyright (C) 2002, 2003 Jeff Nathan <jeff@snort.org>
* Original version submitted by ocsic <pisco@private.as>
*
* nemesis-ip.c (IP Packet Injector)
*
*/
#include "nemesis-ip.h"
#include "nemesis.h"
#if defined(WIN32)
#include <pcap.h>
#endif
static ETHERhdr etherhdr;
static IPhdr iphdr;
static FileData pd, ipod;
static int got_payload;
static char *payloadfile = NULL; /* payload file name */
static char *ipoptionsfile = NULL; /* IP options file name */
static char *device = NULL; /* Ethernet device */
#if defined(WIN32)
static char *ifacetmp = NULL;
#endif
static void ip_cmdline(int, char **);
static int ip_exit(int);
static void ip_initdata(void);
static void ip_usage(char *);
static void ip_validatedata(void);
static void ip_verbose(void);
void nemesis_ip(int argc, char **argv)
{
const char *module = "IP Packet Injection";
nemesis_maketitle(title, module, version);
if (argc > 1 && !strncmp(argv[1], "help", 4))
ip_usage(argv[0]);
if (nemesis_seedrand() < 0)
fprintf(stderr, "ERROR: Unable to seed random number generator.\n");
ip_initdata();
ip_cmdline(argc, argv);
ip_validatedata();
ip_verbose();
if (got_payload)
{
#if defined(WIN32)
if (builddatafromfile(IP_LINKBUFFSIZE, &pd, (const char *)payloadfile,
(const u_int32_t)PAYLOADMODE) < 0)
#else
if (builddatafromfile(((got_link == 1) ? IP_LINKBUFFSIZE :
IP_RAWBUFFSIZE), &pd, (const char *)payloadfile,
(const u_int32_t)PAYLOADMODE) < 0)
#endif
ip_exit(1);
}
if (got_ipoptions)
{
if (builddatafromfile(OPTIONSBUFFSIZE, &ipod,
(const char *)ipoptionsfile, (const u_int32_t)OPTIONSMODE) < 0)
ip_exit(1);
}
if (buildip(ðerhdr, &iphdr, &pd, &ipod, device) < 0)
{
puts("\nIP Injection Failure");
ip_exit(1);
}
else
{
puts("\nIP Packet Injected");
ip_exit(0);
}
}
static void ip_initdata(void)
{
/* defaults */
etherhdr.ether_type = ETHERTYPE_IP; /* Ethernet type IP */
memset(etherhdr.ether_shost, 0, 6); /* Ethernet source address */
memset(etherhdr.ether_dhost, 0xff, 6); /* Ethernet destination address */
memset(&iphdr.ip_src.s_addr, 0, 4); /* IP source address */
memset(&iphdr.ip_dst.s_addr, 0, 4); /* IP destination address */
iphdr.ip_tos = 0; /* IP type of service */
iphdr.ip_id = (u_int16_t)libnet_get_prand(PRu16); /* IP ID */
iphdr.ip_off = 0; /* IP fragmentation offset */
iphdr.ip_ttl = 255; /* IP TTL */
iphdr.ip_p = 0; /* IP protocol */
pd.file_mem = NULL;
pd.file_s = 0;
ipod.file_mem = NULL;
ipod.file_s = 0;
return;
}
static void ip_validatedata(void)
{
struct sockaddr_in sin;
/* validation tests */
if (iphdr.ip_src.s_addr == 0)
iphdr.ip_src.s_addr = (u_int32_t)libnet_get_prand(PRu32);
if (iphdr.ip_dst.s_addr == 0)
iphdr.ip_dst.s_addr = (u_int32_t)libnet_get_prand(PRu32);
/* if the user has supplied a source hardware addess but not a device
* try to select a device automatically
*/
if (memcmp(etherhdr.ether_shost, zero, 6) && !got_link && !device)
{
if (libnet_select_device(&sin, &device, (char *)&errbuf) < 0)
{
printf("ERROR: Device not specified and unable to automatically "
"select a device.\n");
ip_exit(1);
}
else
{
#ifdef DEBUG
printf("DEBUG: automatically selected device: "
" %s\n", device);
#endif
got_link = 1;
}
}
/* if a device was specified and the user has not specified a source
* hardware address, try to determine the source address automatically
*/
if (got_link)
{
if ((nemesis_check_link(ðerhdr, device)) < 0)
{
fprintf(stderr, "ERROR: cannot retrieve hardware address of "
"%s.\n", device);
ip_exit(1);
}
}
return;
}
static void ip_usage(char *arg)
{
nemesis_printtitle((const char *)title);
printf("IP Usage:\n %s [-v (verbose)] [options]\n\n", arg);
printf("IP Options: \n"
" -S <Source IP address>\n"
" -D <Destination IP address>\n"
" -I <IP ID>\n"
" -p <IP protocol number>\n"
" -T <IP TTL>\n"
" -t <IP TOS>\n"
" -F <IP fragmentation options>\n"
" -F[D],[M],[R],[offset]\n"
" -O <IP options file>\n"
" -P <Payload file>\n\n");
printf("Data Link Options: \n"
#if defined(WIN32)
" -d <Ethernet device number>\n"
#else
" -d <Ethernet device name>\n"
#endif
" -H <Source MAC address>\n"
" -M <Destination MAC address>\n");
#if defined(WIN32)
printf(" -Z (List available network interfaces by number)\n");
#endif
putchar('\n');
ip_exit(1);
}
static void ip_cmdline(int argc, char **argv)
{
int opt, i;
u_int32_t addr_tmp[6];
char *ip_options;
extern char *optarg;
extern int optind;
#if defined(ENABLE_PCAPOUTPUT)
#if defined(WIN32)
ip_options = "d:D:F:H:I:M:O:p:P:S:t:T:vWZ?";
#else
ip_options = "d:D:F:H:I:M:O:p:P:S:t:T:vW?";
#endif
#else
#if defined(WIN32)
ip_options = "d:D:F:H:I:M:O:p:P:S:t:T:vZ?";
#else
ip_options = "d:D:F:H:I:M:O:p:P:S:t:T:v?";
#endif
#endif
while ((opt = getopt(argc, argv, ip_options)) != -1)
{
switch (opt)
{
case 'd': /* Ethernet device */
#if defined(WIN32)
if (nemesis_getdev(atoi(optarg), &device) < 0)
{
fprintf(stderr, "ERROR: Unable to lookup device: '%d'.\n",
atoi(optarg));
ip_exit(1);
}
#else
if (strlen(optarg) < 256)
{
device = strdup(optarg);
got_link = 1;
}
else
{
fprintf(stderr, "ERROR: device %s > 256 characters\n",
optarg);
ip_exit(1);
}
#endif
break;
case 'D': /* destination IP address */
if ((nemesis_name_resolve(optarg,
(u_int32_t *)&iphdr.ip_dst.s_addr )) < 0)
{
fprintf(stderr, "ERROR: Invalid destination IP address: "
"\"%s\".\n", optarg);
ip_exit(1);
}
break;
case 'F': /* IP fragmentation options */
if (parsefragoptions(&iphdr, optarg) < 0)
ip_exit(1);
break;
case 'H': /* Ethernet source address */
memset(addr_tmp, 0, sizeof(addr_tmp));
sscanf(optarg, "%02X:%02X:%02X:%02X:%02X:%02X", &addr_tmp[0],
&addr_tmp[1], &addr_tmp[2], &addr_tmp[3], &addr_tmp[4],
&addr_tmp[5]);
for (i = 0; i < 6; i++)
etherhdr.ether_shost[i] = (u_int8_t)addr_tmp[i];
break;
case 'I': /* IP ID */
iphdr.ip_id = xgetint16(optarg);
break;
case 'M': /* Ethernet destination address */
memset(addr_tmp, 0, sizeof(addr_tmp));
sscanf(optarg, "%02X:%02X:%02X:%02X:%02X:%02X", &addr_tmp[0],
&addr_tmp[1], &addr_tmp[2], &addr_tmp[3], &addr_tmp[4],
&addr_tmp[5]);
for (i = 0; i < 6; i++)
etherhdr.ether_dhost[i] = (u_int8_t)addr_tmp[i];
break;
case 'O': /* IP options file */
if (strlen(optarg) < 256)
{
ipoptionsfile = strdup(optarg);
got_ipoptions = 1;
}
else
{
fprintf(stderr, "ERROR: IP options file %s > 256 "
"characters.\n", optarg);
ip_exit(1);
}
break;
case 'p': /* IP protocol */
iphdr.ip_p = xgetint8(optarg);
break;
case 'P': /* payload file */
if (strlen(optarg) < 256)
{
payloadfile = strdup(optarg);
got_payload = 1;
}
else
{
fprintf(stderr, "ERROR: payload file %s > 256 characters\n",
optarg);
ip_exit(1);
}
break;
case 'S': /* source IP address */
if ((nemesis_name_resolve(optarg,
(u_int32_t *)&iphdr.ip_src.s_addr )) < 0)
{
fprintf(stderr, "ERROR: Invalid source IP address: \"%s\"."
"\n", optarg);
ip_exit(1);
}
break;
case 't': /* IP type of service */
iphdr.ip_tos = xgetint8(optarg);
break;
case 'T': /* IP time to live */
iphdr.ip_ttl = xgetint8(optarg);
break;
case 'v':
verbose++;
if (verbose == 1)
nemesis_printtitle((const char *)title);
break;
#if defined(WIN32)
case 'Z':
if ((ifacetmp = pcap_lookupdev(errbuf)) == NULL)
perror(errbuf);
PrintDeviceList(ifacetmp);
ip_exit(1);
#endif
case '?': /* FALLTHROUGH */
default:
ip_usage(argv[0]);
break;
}
}
argc -= optind;
argv += optind;
return;
}
static int ip_exit(int code)
{
if (got_payload)
free(pd.file_mem);
if (got_ipoptions)
free(ipod.file_mem);
if (device != NULL)
free(device);
if (ipoptionsfile != NULL)
free(ipoptionsfile);
if (payloadfile != NULL)
free(payloadfile);
#if defined(WIN32)
if (ifacetmp != NULL)
free(ifacetmp);
#endif
exit(code);
}
static void ip_verbose(void)
{
if (verbose)
{
if (got_link)
nemesis_printeth(ðerhdr);
nemesis_printip(&iphdr);
}
return;
}
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