Annotation of embedaddon/libnet/sample/tcp2.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: tcp2.c,v 1.3 2004/01/28 19:45:00 mike Exp $
! 3: *
! 4: * libnet 1.1
! 5: * raw_tcp.c - 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:
! 38: int
! 39: main(int argc, char **argv)
! 40: {
! 41: int c;
! 42: u_char *cp;
! 43: libnet_t *l;
! 44: libnet_ptag_t t;
! 45: char *payload;
! 46: u_short payload_s;
! 47: u_long src_ip, dst_ip;
! 48: u_short src_prt, dst_prt;
! 49: char errbuf[LIBNET_ERRBUF_SIZE];
! 50:
! 51: printf("libnet 1.1 packet shaping: TCP[raw]\n");
! 52:
! 53: /*
! 54: * Initialize the library. Root priviledges are required.
! 55: */
! 56: l = libnet_init(
! 57: LIBNET_RAW4, /* injection type */
! 58: NULL, /* network interface */
! 59: errbuf); /* errbuf */
! 60: if (l == NULL)
! 61: {
! 62: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 63: exit(EXIT_FAILURE);
! 64: }
! 65:
! 66: src_ip = 0;
! 67: dst_ip = 0;
! 68: src_prt = 0;
! 69: dst_prt = 0;
! 70: payload = NULL;
! 71: payload_s = 0;
! 72: while((c = getopt(argc, argv, "d:s:p:")) != EOF)
! 73: {
! 74: switch (c)
! 75: {
! 76: /*
! 77: * We expect the input to be of the form `ip.ip.ip.ip.port`. We
! 78: * point cp to the last dot of the IP address/port string and
! 79: * then seperate them with a NULL byte. The optarg now points to
! 80: * just the IP address, and cp points to the port.
! 81: */
! 82: case 'd':
! 83: if (!(cp = strrchr(optarg, '.')))
! 84: {
! 85: usage(argv[0]);
! 86: }
! 87: *cp++ = 0;
! 88: dst_prt = (u_short)atoi(cp);
! 89: if ((dst_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 90: {
! 91: fprintf(stderr, "Bad destination IP address: %s\n", optarg);
! 92: exit(EXIT_FAILURE);
! 93: }
! 94: break;
! 95: break;
! 96: case 'p':
! 97: payload = optarg;
! 98: payload_s = strlen(payload);
! 99: break;
! 100: case 's':
! 101: if (!(cp = strrchr(optarg, '.')))
! 102: {
! 103: usage(argv[0]);
! 104: }
! 105: *cp++ = 0;
! 106: src_prt = (u_short)atoi(cp);
! 107: if ((src_ip = libnet_name2addr4(l, optarg, LIBNET_RESOLVE)) == -1)
! 108: {
! 109: fprintf(stderr, "Bad source IP address: %s\n", optarg);
! 110: exit(EXIT_FAILURE);
! 111: }
! 112: break;
! 113: }
! 114: }
! 115: if (!src_ip || !src_prt || !dst_ip || !dst_prt)
! 116: {
! 117: usage(argv[0]);
! 118: exit(EXIT_FAILURE);
! 119: }
! 120:
! 121: t = libnet_build_tcp(
! 122: src_prt, /* source port */
! 123: dst_prt, /* destination port */
! 124: 0x01010101, /* sequence number */
! 125: 0x02020202, /* acknowledgement num */
! 126: TH_SYN, /* control flags */
! 127: 32767, /* window size */
! 128: 0, /* checksum */
! 129: 10, /* urgent pointer */
! 130: LIBNET_TCP_H + payload_s, /* TCP packet size */
! 131: payload, /* payload */
! 132: payload_s, /* payload size */
! 133: l, /* libnet handle */
! 134: 0); /* libnet id */
! 135: if (t == -1)
! 136: {
! 137: fprintf(stderr, "Can't build TCP header: %s\n", libnet_geterror(l));
! 138: goto bad;
! 139: }
! 140:
! 141: t = libnet_build_ipv4(
! 142: LIBNET_IPV4_H + LIBNET_TCP_H + payload_s, /* length */
! 143: 0, /* TOS */
! 144: 242, /* IP ID */
! 145: 0, /* IP Frag */
! 146: 64, /* TTL */
! 147: IPPROTO_TCP, /* protocol */
! 148: 0, /* checksum */
! 149: src_ip, /* source IP */
! 150: dst_ip, /* destination IP */
! 151: NULL, /* payload */
! 152: 0, /* payload size */
! 153: l, /* libnet handle */
! 154: 0); /* libnet id */
! 155: if (t == -1)
! 156: {
! 157: fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
! 158: goto bad;
! 159: }
! 160:
! 161: /*
! 162: * Write it to the wire.
! 163: */
! 164:
! 165: c = libnet_write(l);
! 166: if (c == -1)
! 167: {
! 168: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 169: goto bad;
! 170: }
! 171: else
! 172: {
! 173: fprintf(stderr, "Wrote %d byte TCP packet; check the wire.\n", c);
! 174: }
! 175: libnet_destroy(l);
! 176: return (EXIT_SUCCESS);
! 177: bad:
! 178: libnet_destroy(l);
! 179: return (EXIT_FAILURE);
! 180: }
! 181:
! 182:
! 183: void
! 184: usage(char *name)
! 185: {
! 186: fprintf(stderr,
! 187: "usage: %s -s source_ip.source_port -d destination_ip.destination_port"
! 188: " [-p payload]\n",
! 189: name);
! 190: }
! 191:
! 192: /* EOF */
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