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bgp4_open.c
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/*
*
* libnet 1.1
* Build a BGP4 open message with what you want as payload
*
* Copyright (c) 2003 Frédéric Raynal <[email protected]>
* All rights reserved.
*
* Examples:
*
* minimal BGP OPEN message:
*
* ./bgp4_open -s 1.1.1.1 -d 2.2.2.2
*
* 12:17:00.879139 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
* 16843009:16843038(29) win 32767: BGP (ttl 64, id 242, len 69)
* 0x0000 4500 0045 00f2 0000 4006 73bc 0101 0101 [email protected].....
* 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
* 0x0020 5002 7fff ad2e 0000 0101 0101 0101 0101 P...............
* 0x0030 0101 0101 0101 0101 001d 0104 1234 5678 .............4Vx
* 0x0040 dead beef 00 .....
*
*
* use payload as BGP option for authentication:
*
* ./bgp4_open -s 1.1.1.1 -d 2.2.2.2 -p `printf "\x01\x01\x00"` -S 3
*
* 12:15:48.102808 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
* 16843009:16843041(32) win 32767: BGP (ttl 64, id 242, len 72)
* 0x0000 4500 0048 00f2 0000 4006 73b9 0101 0101 [email protected].....
* 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
* 0x0020 5002 7fff a927 0000 0101 0101 0101 0101 P....'..........
* 0x0030 0101 0101 0101 0101 0020 0104 1234 5678 .............4Vx
* 0x0040 dead beef 0301 0100 ........
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#include "./libnet_test.h"
int
main(int argc, char *argv[])
{
int c;
libnet_t *l;
u_long src_ip, dst_ip, length;
libnet_ptag_t t = 0;
char errbuf[LIBNET_ERRBUF_SIZE];
u_char *payload = NULL;
u_long payload_s = 0;
u_char marker[LIBNET_BGP4_MARKER_SIZE];
printf("libnet 1.1 packet shaping: BGP4 open + payload[raw]\n");
/*
* Initialize the library. Root priviledges are required.
*/
l = libnet_init(
LIBNET_RAW4, /* injection type */
NULL, /* network interface */
errbuf); /* error buffer */
if (l == NULL)
{
fprintf(stderr, "libnet_init() failed: %s", errbuf);
exit(EXIT_FAILURE);
}
src_ip = 0;
dst_ip = 0;
memset(marker, 0x1, LIBNET_BGP4_MARKER_SIZE);
while ((c = getopt(argc, argv, "d:s:t:m:p:S:")) != EOF)
{
switch (c)
{
/*
* We expect the input to be of the form `ip.ip.ip.ip.port`. We
* point cp to the last dot of the IP address/port string and
* then separate them with a NULL byte. The optarg now points to
* just the IP address, and cp points to the port.
*/
case 'd':
if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
{
fprintf(stderr, "Bad destination IP address: %s\n", optarg);
exit(EXIT_FAILURE);
}
break;
case 's':
if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
{
fprintf(stderr, "Bad source IP address: %s\n", optarg);
exit(EXIT_FAILURE);
}
break;
case 'm':
memcpy(marker, optarg, LIBNET_BGP4_MARKER_SIZE);
break;
case 'p':
payload = (u_char *)optarg;
break;
case 'S':
payload_s = atoi(optarg);
break;
default:
exit(EXIT_FAILURE);
}
}
if (!src_ip || !dst_ip)
{
usage(argv[0]);
goto bad;
}
if (payload_s && !payload)
{
payload = (u_char *)malloc(payload_s);
if (!payload)
{
printf("memory allocation failed (%ld bytes requested)\n", payload_s);
goto bad;
}
memset(payload, 0x41, payload_s);
}
if (payload && !payload_s)
{
payload_s = strlen((char *)payload);
}
length = LIBNET_BGP4_OPEN_H + payload_s;
t = libnet_build_bgp4_open(
4, /* version */
0x3412, /* my AS */
0x7856, /* hold time */
0xefbeadde, /* BGP id */
payload_s, /* options length */
payload, /* payload */
payload_s, /* payload size */
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build BGP4 open header: %s\n", libnet_geterror(l));
goto bad;
}
length+=LIBNET_BGP4_HEADER_H;
t = libnet_build_bgp4_header(
marker, /* marker */
length, /* length */
LIBNET_BGP4_OPEN, /* message type */
NULL, /* payload */
0, /* payload size */
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build BGP4 header: %s\n", libnet_geterror(l));
goto bad;
}
length+=LIBNET_TCP_H;
t = libnet_build_tcp(
0x6666, /* source port */
179, /* destination port */
0x01010101, /* sequence number */
0x02020202, /* acknowledgement num */
TH_SYN, /* control flags */
32767, /* window size */
0, /* checksum */
0, /* urgent pointer */
length, /* TCP packet size */
NULL, /* payload */
0, /* payload size */
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
goto bad;
}
length+=LIBNET_IPV4_H;
t = libnet_build_ipv4(
length, /* length */
0, /* TOS */
242, /* IP ID */
0, /* IP Frag */
64, /* TTL */
IPPROTO_TCP, /* protocol */
0, /* checksum */
src_ip, /* source IP */
dst_ip, /* destination IP */
NULL, /* payload */
0, /* payload size */
l, /* libnet handle */
0); /* libnet id */
if (t == -1)
{
fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
goto bad;
}
/*
* Write it to the wire.
*/
c = libnet_write(l);
if (c == -1)
{
fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
goto bad;
}
else
{
fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
}
libnet_destroy(l);
return (EXIT_SUCCESS);
bad:
libnet_destroy(l);
return (EXIT_FAILURE);
}
void
usage(char *name)
{
fprintf(stderr,
"usage: %s -s source_ip -d destination_ip"
" [-m marker] [-p payload] [-S payload size]\n",
name);
}