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Diffstat (limited to 'libnet/sample/ip_link.c')
-rw-r--r-- | libnet/sample/ip_link.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/libnet/sample/ip_link.c b/libnet/sample/ip_link.c new file mode 100644 index 0000000..9b471f0 --- /dev/null +++ b/libnet/sample/ip_link.c @@ -0,0 +1,201 @@ +/* + * + * libnet 1.1 + * Build a IPv4 packet with what you want as payload + * + * Copyright (c) 2003 Frédéric Raynal <pappy@security-labs.org> + * All rights reserved. + * + * Ex: + * - send an UDP packet from port 4369 to port 8738 + * ./ip -s 1.1.1.1 -d 2.2.2.2 + * + * - send a TCP SYN from port 4369 to port 8738 + * ./ip -s 1.1.1.1 -d 2.2.2.2 -t -p `printf "\x04\x57\x08\xae\x01\x01\x01\x01\x02\x02\x02\x02\x50\x02\x7f\xff\xd5\x91\x41\x41"` + * + * + * 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; + char *device = NULL; + char *dst = "2.2.2.2", *src = "1.1.1.1"; + char *hwdst = "22:22:22:22:22:22", *hwsrc = "11:11:11:11:11:11"; + u_long src_ip, dst_ip; + char errbuf[LIBNET_ERRBUF_SIZE]; + libnet_ptag_t ip_ptag = 0; + libnet_ptag_t eth_ptag = 0; + u_short proto = IPPROTO_UDP; + u_char payload[255] = {0x11, 0x11, 0x22, 0x22, 0x00, 0x08, 0xc6, 0xa5}; + u_long payload_s = 8; + + printf("libnet 1.1 packet shaping: IP + payload[link]\n"); + + while ((c = getopt(argc, argv, "d:s:D:S:tp:i:h")) != EOF) + { + switch (c) + { + case 'D': + hwdst = optarg; + break; + + case 'S': + hwsrc = optarg; + break; + + case 'd': + dst = optarg; + break; + + case 's': + src = optarg; + break; + + case 'i': + device = optarg; + break; + + case 't': + proto = IPPROTO_TCP; + break; + + case 'p': + strncpy(payload, optarg, sizeof(payload)-1); + payload_s = strlen(payload); + break; + + case 'h': + usage(argv[0]); + exit(EXIT_SUCCESS); + + default: + exit(EXIT_FAILURE); + } + } + + + /* + * Initialize the library. Root priviledges are required. + */ + l = libnet_init( + LIBNET_LINK, /* injection type */ + device, /* network interface */ + errbuf); /* error buffer */ + + printf("Using device %s\n", l->device); + + if (l == NULL) + { + fprintf(stderr, "libnet_init() failed: %s", errbuf); + exit(EXIT_FAILURE); + } + + if ((dst_ip = libnet_name2addr4(l, dst, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad destination IP address: %s\n", dst); + exit(EXIT_FAILURE); + } + + if ((src_ip = libnet_name2addr4(l, src, LIBNET_RESOLVE)) == -1) + { + fprintf(stderr, "Bad source IP address: %s\n", src); + exit(EXIT_FAILURE); + } + + /* + * Build the packet + */ + ip_ptag = libnet_build_ipv4( + LIBNET_IPV4_H + payload_s, /* length */ + 0, /* TOS */ + 242, /* IP ID */ + 0, /* IP Frag */ + 64, /* TTL */ + proto, /* protocol */ + 0, /* checksum */ + src_ip, /* source IP */ + dst_ip, /* destination IP */ + payload, /* payload */ + payload_s, /* payload size */ + l, /* libnet handle */ + ip_ptag); /* libnet id */ + if (ip_ptag == -1) + { + fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l)); + goto bad; + } + + eth_ptag = libnet_build_ethernet( + hwdst, /* ethernet destination */ + hwsrc, /* ethernet source */ + ETHERTYPE_IP, /* protocol type */ + NULL, /* payload */ + 0, /* payload size */ + l, /* libnet handle */ + 0); /* libnet id */ + if (eth_ptag == -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 IP 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]" + " [-S HW src] [-D HW dst]" + " [-i iface] [-p payload] [-t]\n", + name); +} + +/* EOF */ |