Annotation of embedaddon/libnet/sample/icmp_unreach.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: icmp_unreach.c,v 1.4 2004/03/16 18:40:59 mike Exp $
! 3: *
! 4: * libnet 1.1
! 5: * Build an ICMP unreachable packet
! 6: *
! 7: * Hacked by Frederic Raynal <pappy@security-labs.org> to illustrate
! 8: * the new API of ICMP error messages fixing Aaron's bugs.
! 9: *
! 10: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
! 11: * All rights reserved.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: *
! 22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 25: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 32: * SUCH DAMAGE.
! 33: *
! 34: */
! 35:
! 36: #if (HAVE_CONFIG_H)
! 37: #include "../include/config.h"
! 38: #endif
! 39: #include "./libnet_test.h"
! 40:
! 41: int
! 42: main(int argc, char **argv)
! 43: {
! 44: int c, i;
! 45: libnet_t *l = NULL;
! 46: libnet_ptag_t ip_err = 0, icmp = 0, ip = 0, eth = 0;
! 47: u_long src_ip, dst_ip;
! 48: u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5};
! 49: u_long payload_s = 8;
! 50: int mode = LIBNET_LINK;
! 51: char errbuf[LIBNET_ERRBUF_SIZE];
! 52:
! 53: printf("libnet 1.1 packet shaping: ICMP unreachable[link]\n");
! 54:
! 55: src_ip = 0;
! 56: dst_ip = 0;
! 57:
! 58: while((c = getopt(argc, argv, "d:s:r")) != EOF)
! 59: {
! 60: switch (c)
! 61: {
! 62: case 'd':
! 63: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 64: {
! 65: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
! 66: exit(1);
! 67: }
! 68: break;
! 69: case 's':
! 70: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 71: {
! 72: fprintf(stderr, "Bad source IP address: %s\n", optarg);
! 73: exit(1);
! 74: }
! 75: break;
! 76: case 'r':
! 77: mode = LIBNET_RAW4;
! 78: break;
! 79: }
! 80: }
! 81: if (!src_ip || !dst_ip)
! 82: {
! 83: usage(argv[0]);
! 84: exit(EXIT_FAILURE);
! 85: }
! 86:
! 87: /*
! 88: * Initialize the library. Root priviledges are required.
! 89: */
! 90: l = libnet_init(
! 91: mode, /* injection type */
! 92: NULL, /* network interface */
! 93: errbuf); /* errbuf */
! 94:
! 95: if (l == NULL)
! 96: {
! 97: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 98: exit(EXIT_FAILURE);
! 99: }
! 100:
! 101: for (i=0; i<255; i++)
! 102: {
! 103: ip_err = libnet_build_ipv4(
! 104: LIBNET_IPV4_H + payload_s, /* o length */
! 105: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* o IP tos */
! 106: (u_int16_t)i, /* o IP ID */
! 107: 0, /* o frag */
! 108: 64, /* o TTL */
! 109: IPPROTO_UDP, /* o protocol */
! 110: 0, /* o checksum */
! 111: dst_ip, /* o source IP */
! 112: src_ip, /* o destination IP */
! 113: payload, /* payload */
! 114: payload_s, /* payload size */
! 115: l,
! 116: ip_err);
! 117: if (ip_err == -1)
! 118: {
! 119: fprintf(stderr, "Can't build error IPv4 header: %s\n",
! 120: libnet_geterror(l));
! 121: goto bad;
! 122: }
! 123:
! 124: icmp = libnet_build_icmpv4_unreach(
! 125: ICMP_UNREACH, /* type */
! 126: ICMP_UNREACH_PORT, /* code */
! 127: 0, /* checksum */
! 128: NULL, /* payload */
! 129: 0, /* payload size */
! 130: l, /* libnet handle */
! 131: icmp);
! 132: if (icmp == -1)
! 133: {
! 134: fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l));
! 135: goto bad;
! 136: }
! 137:
! 138: ip = libnet_build_ipv4(
! 139: LIBNET_IPV4_H + LIBNET_ICMPV4_UNREACH_H +
! 140: LIBNET_IPV4_H + payload_s, /* length */
! 141: IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */
! 142: (u_int16_t)i + 1, /* IP ID */
! 143: 0, /* IP Frag */
! 144: 64, /* TTL */
! 145: IPPROTO_ICMP, /* protocol */
! 146: 0, /* checksum */
! 147: src_ip, /* source IP */
! 148: dst_ip, /* destination IP */
! 149: NULL, /* payload */
! 150: 0, /* payload size */
! 151: l, /* libnet handle */
! 152: ip);
! 153: if (ip == -1)
! 154: {
! 155: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 156: goto bad;
! 157: }
! 158:
! 159: if (mode == LIBNET_LINK) {
! 160: eth = libnet_build_ethernet(
! 161: enet_dst, /* ethernet destination */
! 162: enet_src, /* ethernet source */
! 163: ETHERTYPE_IP, /* protocol type */
! 164: NULL, /* payload */
! 165: 0, /* payload size */
! 166: l, /* libnet handle */
! 167: eth); /* libnet id */
! 168:
! 169: if (eth == -1)
! 170: {
! 171: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
! 172: goto bad;
! 173: }
! 174: }
! 175: /*
! 176: * Write it to the wire.
! 177: */
! 178: libnet_diag_dump_pblock(l);
! 179: c = libnet_write(l);
! 180: if (c == -1)
! 181: {
! 182: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 183: goto bad;
! 184: }
! 185: else
! 186: {
! 187: fprintf(stderr, "Wrote %d byte ICMP packet; check the wire.\n", c);
! 188: }
! 189: }
! 190: libnet_destroy(l);
! 191: return (EXIT_SUCCESS);
! 192: bad:
! 193: libnet_destroy(l);
! 194: return (EXIT_FAILURE);
! 195: }
! 196:
! 197:
! 198: void
! 199: usage(char *name)
! 200: {
! 201: fprintf(stderr, "usage: %s [-r] -s source_ip -d destination_ip\n ", name);
! 202: }
! 203:
! 204: /* EOF */
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