Annotation of embedaddon/libnet/sample/bgp4_update.c, revision 1.1
1.1 ! misho 1: /*
! 2: *
! 3: * libnet 1.1
! 4: * Build a BGP4 update message with what you want as payload
! 5: *
! 6: * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org>
! 7: * All rights reserved.
! 8: *
! 9: * Examples:
! 10: *
! 11: * empty BGP UPDATE message:
! 12: *
! 13: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2
! 14: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
! 15: * Wrote 63 byte TCP packet; check the wire.
! 16: *
! 17: * 13:44:29.216135 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
! 18: * 16843009:16843032(23) win 32767: BGP (ttl 64, id 242, len 63)
! 19: * 0x0000 4500 003f 00f2 0000 4006 73c2 0101 0101 E..?....@.s.....
! 20: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
! 21: * 0x0020 5002 7fff b288 0000 0101 0101 0101 0101 P...............
! 22: * 0x0030 0101 0101 0101 0101 0017 0200 0000 00 ...............
! 23: *
! 24: *
! 25: * BGP UPDATE with Path Attributes and Unfeasible Routes Length
! 26: *
! 27: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2 -a `printf "\x01\x02\x03"` -A 3 -W 13
! 28: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
! 29: * Wrote 79 byte TCP packet; check the wire.
! 30: *
! 31: * 13:45:59.579901 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
! 32: * 16843009:16843048(39) win 32767: BGP (ttl 64, id 242, len 79)
! 33: * 0x0000 4500 004f 00f2 0000 4006 73b2 0101 0101 E..O....@.s.....
! 34: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
! 35: * 0x0020 5002 7fff 199b 0000 0101 0101 0101 0101 P...............
! 36: * 0x0030 0101 0101 0101 0101 0027 0200 0d41 4141 .........'...AAA
! 37: * 0x0040 4141 4141 4141 4141 4141 0003 0102 03 AAAAAAAAAA.....
! 38: *
! 39: *
! 40: * BGP UPDATE with Reachability Information
! 41: *
! 42: * # ./bgp4_update -s 1.1.1.1 -d 2.2.2.2 -I 7
! 43: * libnet 1.1 packet shaping: BGP4 update + payload[raw]
! 44: * Wrote 70 byte TCP packet; check the wire.
! 45: *
! 46: * 13:49:02.829225 1.1.1.1.26214 > 2.2.2.2.179: S [tcp sum ok]
! 47: * 16843009:16843039(30) win 32767: BGP (ttl 64, id 242, len 70)
! 48: * 0x0000 4500 0046 00f2 0000 4006 73bb 0101 0101 E..F....@.s.....
! 49: * 0x0010 0202 0202 6666 00b3 0101 0101 0202 0202 ....ff..........
! 50: * 0x0020 5002 7fff e86d 0000 0101 0101 0101 0101 P....m..........
! 51: * 0x0030 0101 0101 0101 0101 001e 0200 0000 0043 ...............C
! 52: * 0x0040 4343 4343 4343 CCCCCC
! 53: *
! 54: *
! 55: * Redistribution and use in source and binary forms, with or without
! 56: * modification, are permitted provided that the following conditions
! 57: * are met:
! 58: * 1. Redistributions of source code must retain the above copyright
! 59: * notice, this list of conditions and the following disclaimer.
! 60: * 2. Redistributions in binary form must reproduce the above copyright
! 61: * notice, this list of conditions and the following disclaimer in the
! 62: * documentation and/or other materials provided with the distribution.
! 63: *
! 64: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 65: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 66: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 67: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 68: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 69: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 70: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 71: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 72: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 73: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 74: * SUCH DAMAGE.
! 75: *
! 76: */
! 77: #if (HAVE_CONFIG_H)
! 78: #include "../include/config.h"
! 79: #endif
! 80: #include "./libnet_test.h"
! 81:
! 82:
! 83: #define set_ptr_and_size(ptr, size, val, flag) \
! 84: if (size && !ptr) \
! 85: { \
! 86: ptr = (u_char *)malloc(size); \
! 87: if (!ptr) \
! 88: { \
! 89: printf("memory allocation failed (%u bytes requested)\n", size); \
! 90: goto bad; \
! 91: } \
! 92: memset(ptr, val, size); \
! 93: flag = 1; \
! 94: } \
! 95: \
! 96: if (ptr && !size) \
! 97: { \
! 98: size = strlen(ptr); \
! 99: }
! 100:
! 101:
! 102:
! 103: int
! 104: main(int argc, char *argv[])
! 105: {
! 106: int c;
! 107: libnet_t *l;
! 108: u_long src_ip, dst_ip, length;
! 109: libnet_ptag_t t = 0;
! 110: char errbuf[LIBNET_ERRBUF_SIZE];
! 111: u_char *payload = NULL;
! 112: u_long payload_s = 0;
! 113: u_char marker[LIBNET_BGP4_MARKER_SIZE];
! 114:
! 115: u_short u_rt_l = 0;
! 116: u_char *withdraw_rt = NULL;
! 117: char flag_w = 0;
! 118: u_short attr_l = 0;
! 119: u_char *attr = NULL;
! 120: char flag_a = 0;
! 121: u_short info_l = 0;
! 122: u_char *info = NULL;
! 123: char flag_i = 0;
! 124:
! 125: printf("libnet 1.1 packet shaping: BGP4 update + payload[raw]\n");
! 126:
! 127: /*
! 128: * Initialize the library. Root priviledges are required.
! 129: */
! 130: l = libnet_init(
! 131: LIBNET_RAW4, /* injection type */
! 132: NULL, /* network interface */
! 133: errbuf); /* error buffer */
! 134:
! 135: if (l == NULL)
! 136: {
! 137: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 138: exit(EXIT_FAILURE);
! 139: }
! 140:
! 141: src_ip = 0;
! 142: dst_ip = 0;
! 143: memset(marker, 0x1, LIBNET_BGP4_MARKER_SIZE);
! 144:
! 145: while ((c = getopt(argc, argv, "d:s:t:m:p:w:W:a:A:i:I:")) != EOF)
! 146: {
! 147: switch (c)
! 148: {
! 149: /*
! 150: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
! 151: * point cp to the last dot of the IP address/port string and
! 152: * then seperate them with a NULL byte. The optarg now points to
! 153: * just the IP address, and cp points to the port.
! 154: */
! 155: case 'd':
! 156: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 157: {
! 158: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
! 159: exit(EXIT_FAILURE);
! 160: }
! 161: break;
! 162:
! 163: case 's':
! 164: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 165: {
! 166: fprintf(stderr, "Bad source IP address: %s\n", optarg);
! 167: exit(EXIT_FAILURE);
! 168: }
! 169: break;
! 170:
! 171: case 'p':
! 172: payload = optarg;
! 173: payload_s = strlen(payload);
! 174: break;
! 175:
! 176: case 'w':
! 177: withdraw_rt = optarg;
! 178: break;
! 179:
! 180: case 'W':
! 181: u_rt_l = atoi(optarg);
! 182: break;
! 183:
! 184: case 'a':
! 185: attr = optarg;
! 186: break;
! 187:
! 188: case 'A':
! 189: attr_l = atoi(optarg);
! 190: break;
! 191:
! 192: case 'i':
! 193: info = optarg;
! 194: break;
! 195:
! 196: case 'I':
! 197: info_l = atoi(optarg);
! 198: break;
! 199:
! 200: default:
! 201: exit(EXIT_FAILURE);
! 202: }
! 203: }
! 204:
! 205: if (!src_ip || !dst_ip)
! 206: {
! 207: usage(argv[0]);
! 208: goto bad;
! 209: }
! 210:
! 211: set_ptr_and_size(withdraw_rt, u_rt_l, 0x41, flag_w);
! 212: set_ptr_and_size(attr, attr_l, 0x42, flag_a);
! 213: set_ptr_and_size(info, info_l, 0x43, flag_i);
! 214:
! 215: /*
! 216: * BGP4 update messages are "dynamic" are fields have variable size. The only
! 217: * sizes we know are those for the 2 first fields ... so we need to count them
! 218: * plus their value.
! 219: */
! 220: length = LIBNET_BGP4_UPDATE_H + u_rt_l + attr_l + info_l + payload_s;
! 221: t = libnet_build_bgp4_update(
! 222: u_rt_l, /* Unfeasible Routes Length */
! 223: withdraw_rt, /* Withdrawn Routes */
! 224: attr_l, /* Total Path Attribute Length */
! 225: attr, /* Path Attributes */
! 226: info_l, /* Network Layer Reachability Information length */
! 227: info, /* Network Layer Reachability Information */
! 228: payload, /* payload */
! 229: payload_s, /* payload size */
! 230: l, /* libnet handle */
! 231: 0); /* libnet id */
! 232: if (t == -1)
! 233: {
! 234: fprintf(stderr, "Can't build BGP4 update header: %s\n", libnet_geterror(l));
! 235: goto bad;
! 236: }
! 237:
! 238: length+=LIBNET_BGP4_HEADER_H;
! 239: t = libnet_build_bgp4_header(
! 240: marker, /* marker */
! 241: length, /* length */
! 242: LIBNET_BGP4_UPDATE, /* message type */
! 243: NULL, /* payload */
! 244: 0, /* payload size */
! 245: l, /* libnet handle */
! 246: 0); /* libnet id */
! 247: if (t == -1)
! 248: {
! 249: fprintf(stderr, "Can't build BGP4 header: %s\n", libnet_geterror(l));
! 250: goto bad;
! 251: }
! 252:
! 253: length+=LIBNET_TCP_H;
! 254: t = libnet_build_tcp(
! 255: 0x6666, /* source port */
! 256: 179, /* destination port */
! 257: 0x01010101, /* sequence number */
! 258: 0x02020202, /* acknowledgement num */
! 259: TH_SYN, /* control flags */
! 260: 32767, /* window size */
! 261: 0, /* checksum */
! 262: 0, /* urgent pointer */
! 263: length, /* TCP packet size */
! 264: NULL, /* payload */
! 265: 0, /* payload size */
! 266: l, /* libnet handle */
! 267: 0); /* libnet id */
! 268: if (t == -1)
! 269: {
! 270: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
! 271: goto bad;
! 272: }
! 273:
! 274: length+=LIBNET_IPV4_H;
! 275: t = libnet_build_ipv4(
! 276: length, /* length */
! 277: 0, /* TOS */
! 278: 242, /* IP ID */
! 279: 0, /* IP Frag */
! 280: 64, /* TTL */
! 281: IPPROTO_TCP, /* protocol */
! 282: 0, /* checksum */
! 283: src_ip, /* source IP */
! 284: dst_ip, /* destination IP */
! 285: NULL, /* payload */
! 286: 0, /* payload size */
! 287: l, /* libnet handle */
! 288: 0); /* libnet id */
! 289: if (t == -1)
! 290: {
! 291: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 292: goto bad;
! 293: }
! 294:
! 295: /*
! 296: * Write it to the wire.
! 297: */
! 298: c = libnet_write(l);
! 299: if (c == -1)
! 300: {
! 301: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 302: goto bad;
! 303: }
! 304: else
! 305: {
! 306: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
! 307: }
! 308:
! 309: if (flag_w) free(withdraw_rt);
! 310: if (flag_a) free(attr);
! 311: if (flag_i) free(info);
! 312:
! 313: libnet_destroy(l);
! 314: return (EXIT_SUCCESS);
! 315: bad:
! 316: if (flag_w) free(withdraw_rt);
! 317: if (flag_a) free(attr);
! 318: if (flag_i) free(info);
! 319:
! 320: libnet_destroy(l);
! 321: return (EXIT_FAILURE);
! 322: }
! 323:
! 324: void
! 325: usage(char *name)
! 326: {
! 327: fprintf(stderr,
! 328: "usage: %s -s source_ip -d destination_ip \n"
! 329: " [-m marker] [-p payload] [-S payload size]\n"
! 330: " [-w Withdrawn Routes] [-W Unfeasible Routes Length]\n"
! 331: " [-a Path Attributes] [-A Attribute Length]\n"
! 332: " [-i Reachability Information] [-I Reachability Information length]\n",
! 333: name);
! 334: }
! 335:
! 336:
! 337: /* EOF */
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