diff options
Diffstat (limited to 'libnet/sample/icmp_redirect.c')
| -rw-r--r-- | libnet/sample/icmp_redirect.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/libnet/sample/icmp_redirect.c b/libnet/sample/icmp_redirect.c new file mode 100644 index 0000000..92d13c0 --- /dev/null +++ b/libnet/sample/icmp_redirect.c @@ -0,0 +1,200 @@ +/* + * $Id: icmp_redirect.c,v 1.3 2004/03/16 18:40:58 mike Exp $ + * + * libnet 1.1 + * Build an ICMP redirect packet + * + * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + * Copyright (c) 2003 Alberto Ornaghi <alor@antifork.org> + * All rights reserved. + * + * 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; + libnet_ptag_t t; + u_long src_ip, dst_ip, gw_ip; + u_char payload[8] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5}; + u_long payload_s = 8; + char errbuf[LIBNET_ERRBUF_SIZE]; + + printf("libnet 1.1 packet shaping: ICMP redirect[link]\n"); + + /* + * Initialize the library. Root priviledges are required. + */ + l = libnet_init( + LIBNET_LINK, /* injection type */ + NULL, /* network interface */ + errbuf); /* errbuf */ + + if (l == NULL) + { + fprintf(stderr, "libnet_init() failed: %s", errbuf); + exit(EXIT_FAILURE); + } + + src_ip = 0; + dst_ip = 0; + gw_ip = 0; + while((c = getopt(argc, argv, "d:s:g:")) != EOF) + { + switch (c) + { + case 'd': + if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad destination IP address: %s\n", optarg); + exit(1); + } + break; + case 's': + if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad source IP address: %s\n", optarg); + exit(1); + } + break; + case 'g': + if ((gw_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad gateway IP address: %s\n", optarg); + exit(1); + } + break; + } + } + if (!src_ip || !dst_ip || !gw_ip) + { + usage(argv[0]); + exit(EXIT_FAILURE); + } + + t = libnet_build_ipv4( + LIBNET_IPV4_H + payload_s, /* length */ + IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */ + 0x42, /* IP ID */ + 0, /* IP Frag */ + 64, /* TTL */ + IPPROTO_ICMP, /* protocol */ + 0, /* checksum */ + dst_ip, /* source IP */ + src_ip, /* destination IP */ + payload, /* payload */ + payload_s, /* payload size */ + l, /* libnet handle */ + 0); + if (t == -1) + { + fprintf(stderr, "Can't build error IP header: %s\n", + libnet_geterror(l)); + goto bad; + } + + t = libnet_build_icmpv4_redirect( + ICMP_REDIRECT, /* type */ + ICMP_REDIRECT_HOST, /* code */ + 0, /* checksum */ + gw_ip, + NULL, + 0, + l, /* libnet handle */ + 0); /* libnet id */ + if (t == -1) + { + fprintf(stderr, "Can't build ICMP header: %s\n", libnet_geterror(l)); + goto bad; + } + + t = libnet_build_ipv4( + LIBNET_IPV4_H + LIBNET_ICMPV4_REDIRECT_H + + LIBNET_IPV4_H + payload_s, /* length */ + IPTOS_LOWDELAY | IPTOS_THROUGHPUT, /* TOS */ + 0xee, /* IP ID */ + 0, /* IP Frag */ + 64, /* TTL */ + IPPROTO_ICMP, /* protocol */ + 0, /* checksum */ + src_ip, /* source IP */ + dst_ip, /* destination IP */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); + if (t == -1) + { + fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l)); + goto bad; + } + + t = libnet_build_ethernet( + enet_dst, /* ethernet destination */ + enet_src, /* ethernet source */ + ETHERTYPE_IP, /* protocol type */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + if (t == -1) + { + fprintf(stderr, "Can't build ethernet 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 ICMP 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 -g gateway_ip\n ", name); +} + +/* EOF */ |