Annotation of embedaddon/libnet/sample/tcp1.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: tcp1.c,v 1.6 2004/03/01 20:26:12 mike Exp $
! 3: *
! 4: * libnet 1.1
! 5: * Build a TCP packet
! 6: *
! 7: * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
! 8: * All rights reserved.
! 9: *
! 10: * Redistribution and use in source and binary forms, with or without
! 11: * modification, are permitted provided that the following conditions
! 12: * are met:
! 13: * 1. Redistributions of source code must retain the above copyright
! 14: * notice, this list of conditions and the following disclaimer.
! 15: * 2. Redistributions in binary form must reproduce the above copyright
! 16: * notice, this list of conditions and the following disclaimer in the
! 17: * documentation and/or other materials provided with the distribution.
! 18: *
! 19: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
! 20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 22: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
! 23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 29: * SUCH DAMAGE.
! 30: *
! 31: */
! 32:
! 33: #if (HAVE_CONFIG_H)
! 34: #include "../include/config.h"
! 35: #endif
! 36: #include "libnet_test.h"
! 37: #ifdef __WIN32__
! 38: #include "../include/win32/getopt.h"
! 39: #endif
! 40:
! 41: int
! 42: main(int argc, char *argv[])
! 43: {
! 44: int c;
! 45: u_char *cp;
! 46: libnet_t *l;
! 47: libnet_ptag_t t;
! 48: char *payload;
! 49: u_short payload_s;
! 50: u_long src_ip, dst_ip;
! 51: u_short src_prt, dst_prt;
! 52: char errbuf[LIBNET_ERRBUF_SIZE];
! 53:
! 54: printf("libnet 1.1 packet shaping: TCP + options[link]\n");
! 55:
! 56: /*
! 57: * Initialize the library. Root priviledges are required.
! 58: */
! 59: l = libnet_init(
! 60: LIBNET_LINK, /* injection type */
! 61: NULL, /* network interface */
! 62: errbuf); /* error buffer */
! 63:
! 64: if (l == NULL)
! 65: {
! 66: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 67: exit(EXIT_FAILURE);
! 68: }
! 69:
! 70: src_ip = 0;
! 71: dst_ip = 0;
! 72: src_prt = 0;
! 73: dst_prt = 0;
! 74: payload = NULL;
! 75: payload_s = 0;
! 76: while ((c = getopt(argc, argv, "d:s:p:")) != EOF)
! 77: {
! 78: switch (c)
! 79: {
! 80: /*
! 81: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
! 82: * point cp to the last dot of the IP address/port string and
! 83: * then seperate them with a NULL byte. The optarg now points to
! 84: * just the IP address, and cp points to the port.
! 85: */
! 86: case 'd':
! 87: if (!(cp = strrchr(optarg, '.')))
! 88: {
! 89: usage(argv[0]);
! 90: }
! 91: *cp++ = 0;
! 92: dst_prt = (u_short)atoi(cp);
! 93: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 94: {
! 95: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
! 96: exit(EXIT_FAILURE);
! 97: }
! 98: break;
! 99: case 's':
! 100: if (!(cp = strrchr(optarg, '.')))
! 101: {
! 102: usage(argv[0]);
! 103: }
! 104: *cp++ = 0;
! 105: src_prt = (u_short)atoi(cp);
! 106: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 107: {
! 108: fprintf(stderr, "Bad source IP address: %s\n", optarg);
! 109: exit(EXIT_FAILURE);
! 110: }
! 111: break;
! 112: case 'p':
! 113: payload = optarg;
! 114: payload_s = strlen(payload);
! 115: break;
! 116: default:
! 117: exit(EXIT_FAILURE);
! 118: }
! 119: }
! 120:
! 121: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
! 122: {
! 123: usage(argv[0]);
! 124: exit(EXIT_FAILURE);
! 125: }
! 126:
! 127: t = libnet_build_tcp_options(
! 128: "\003\003\012\001\002\004\001\011\010\012\077\077\077\077\000\000\000\000\000\000",
! 129: 20,
! 130: l,
! 131: 0);
! 132: if (t == -1)
! 133: {
! 134: fprintf(stderr, "Can't build TCP options: %s\n", libnet_geterror(l));
! 135: goto bad;
! 136: }
! 137:
! 138: t = libnet_build_tcp(
! 139: src_prt, /* source port */
! 140: dst_prt, /* destination port */
! 141: 0x01010101, /* sequence number */
! 142: 0x02020202, /* acknowledgement num */
! 143: TH_SYN, /* control flags */
! 144: 32767, /* window size */
! 145: 0, /* checksum */
! 146: 10, /* urgent pointer */
! 147: LIBNET_TCP_H + 20 + payload_s, /* TCP packet size */
! 148: payload, /* payload */
! 149: payload_s, /* payload size */
! 150: l, /* libnet handle */
! 151: 0); /* libnet id */
! 152: if (t == -1)
! 153: {
! 154: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
! 155: goto bad;
! 156: }
! 157:
! 158: t = libnet_build_ipv4(
! 159: LIBNET_IPV4_H + LIBNET_TCP_H + 20 + payload_s,/* length */
! 160: 0, /* TOS */
! 161: 242, /* IP ID */
! 162: 0, /* IP Frag */
! 163: 64, /* TTL */
! 164: IPPROTO_TCP, /* protocol */
! 165: 0, /* checksum */
! 166: src_ip, /* source IP */
! 167: dst_ip, /* destination IP */
! 168: NULL, /* payload */
! 169: 0, /* payload size */
! 170: l, /* libnet handle */
! 171: 0); /* libnet id */
! 172: if (t == -1)
! 173: {
! 174: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 175: goto bad;
! 176: }
! 177:
! 178: t = libnet_build_ethernet(
! 179: enet_dst, /* ethernet destination */
! 180: enet_src, /* ethernet source */
! 181: ETHERTYPE_IP, /* protocol type */
! 182: NULL, /* payload */
! 183: 0, /* payload size */
! 184: l, /* libnet handle */
! 185: 0); /* libnet id */
! 186: if (t == -1)
! 187: {
! 188: fprintf(stderr, "Can't build ethernet header: %s\n", libnet_geterror(l));
! 189: goto bad;
! 190: }
! 191:
! 192: /*
! 193: * Write it to the wire.
! 194: */
! 195: c = libnet_write(l);
! 196: if (c == -1)
! 197: {
! 198: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 199: goto bad;
! 200: }
! 201: else
! 202: {
! 203: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
! 204: }
! 205:
! 206: libnet_destroy(l);
! 207: return (EXIT_SUCCESS);
! 208: bad:
! 209: libnet_destroy(l);
! 210: return (EXIT_FAILURE);
! 211: }
! 212:
! 213: void
! 214: usage(char *name)
! 215: {
! 216: fprintf(stderr,
! 217: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
! 218: " [-p payload]\n",
! 219: name);
! 220: }
! 221:
! 222: #if defined(__WIN32__)
! 223: #include <../include/win32/getopt.h>
! 224: #include <winsock2.h>
! 225: #include <ws2tcpip.h>
! 226: #endif /* __WIN32__ */
! 227: /* EOF */
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