Annotation of embedaddon/libnet/sample/stp.c, revision 1.1
1.1 ! misho 1: /*
! 2: * $Id: stp.c,v 1.3 2004/01/21 19:01:29 mike Exp $
! 3: *
! 4: * libnet 1.1
! 5: * Build an STP frame
! 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: #define CONF 1
! 39: #define TCN 2
! 40:
! 41: int
! 42: main(int argc, char *argv[])
! 43: {
! 44: int c, len, type;
! 45: libnet_t *l;
! 46: libnet_ptag_t t;
! 47: u_char *dst, *src;
! 48: u_char rootid[8], bridgeid[8];
! 49: char *device = NULL;
! 50: char errbuf[LIBNET_ERRBUF_SIZE];
! 51:
! 52: printf("libnet 1.1 packet shaping: [STP]\n");
! 53:
! 54: device = NULL;
! 55: src = dst = NULL;
! 56: type = CONF;
! 57: while ((c = getopt(argc, argv, "cd:i:s:t")) != EOF)
! 58: {
! 59: switch (c)
! 60: {
! 61: case 'c':
! 62: type = CONF;
! 63: break;
! 64: case 'd':
! 65: dst = libnet_hex_aton(optarg, &len);
! 66: break;
! 67: case 'i':
! 68: device = optarg;
! 69: break;
! 70: case 's':
! 71: src = libnet_hex_aton(optarg, &len);
! 72: break;
! 73: case 't':
! 74: type = TCN;
! 75: break;
! 76: default:
! 77: usage(argv[0]);
! 78: exit(EXIT_FAILURE);
! 79: }
! 80: }
! 81:
! 82: if (src == NULL || dst == NULL)
! 83: {
! 84: usage(argv[0]);
! 85: exit(EXIT_FAILURE);
! 86: }
! 87:
! 88: /*
! 89: * Initialize the library. Root priviledges are required.
! 90: */
! 91: l = libnet_init(
! 92: LIBNET_LINK, /* injection type */
! 93: device, /* network interface */
! 94: errbuf); /* errbuf */
! 95:
! 96: if (l == NULL)
! 97: {
! 98: fprintf(stderr, "libnet_init() failed: %s", errbuf);
! 99: exit(EXIT_FAILURE);
! 100: }
! 101:
! 102: if (type == CONF)
! 103: {
! 104: rootid[0] = 0x80;
! 105: rootid[1] = 0x00;
! 106: rootid[2] = 0x00;
! 107: rootid[3] = 0x07;
! 108: rootid[4] = 0xec;
! 109: rootid[5] = 0xae;
! 110: rootid[6] = 0x30;
! 111: rootid[7] = 0x41;
! 112:
! 113: bridgeid[0] = 0x80;
! 114: bridgeid[1] = 0x00;
! 115: bridgeid[2] = 0x00;
! 116: bridgeid[3] = 0x07;
! 117: bridgeid[4] = 0xec;
! 118: bridgeid[5] = 0xae;
! 119: bridgeid[6] = 0x30;
! 120: bridgeid[7] = 0x41;
! 121:
! 122: t = libnet_build_stp_conf(
! 123: 0x0000, /* protocol id */
! 124: 0x00, /* protocol version */
! 125: 0x00, /* BPDU type */
! 126: 0x00, /* BPDU flags */
! 127: rootid, /* root id */
! 128: 0x00000001, /* root path cost */
! 129: bridgeid, /* bridge id */
! 130: 0x8002, /* port id */
! 131: 0x00, /* message age */
! 132: 0x0014, /* max age */
! 133: 0x0002, /* hello time */
! 134: 0x000f, /* forward delay */
! 135: NULL, /* payload */
! 136: 0, /* payload size */
! 137: l, /* libnet handle */
! 138: 0); /* libnet id */
! 139: if (t == -1)
! 140: {
! 141: fprintf(stderr, "Can't build STP conf header: %s\n",
! 142: libnet_geterror(l));
! 143: goto bad;
! 144: }
! 145: }
! 146: else
! 147: {
! 148: t = libnet_build_stp_tcn(
! 149: 0x0000, /* protocol id */
! 150: 0x00, /* protocol version */
! 151: 0x80, /* BPDU type */
! 152: NULL, /* payload */
! 153: 0, /* payload size */
! 154: l, /* libnet handle */
! 155: 0); /* libnet id */
! 156: if (t == -1)
! 157: {
! 158: fprintf(stderr, "Can't build STP tcn header: %s\n",
! 159: libnet_geterror(l));
! 160: goto bad;
! 161: }
! 162: }
! 163:
! 164: t = libnet_build_802_2(
! 165: LIBNET_SAP_STP, /* DSAP */
! 166: LIBNET_SAP_STP, /* SSAP */
! 167: 0x03, /* control */
! 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 ethernet header: %s\n",
! 175: libnet_geterror(l));
! 176: goto bad;
! 177: }
! 178:
! 179: t = libnet_build_802_3(
! 180: dst, /* ethernet destination */
! 181: src, /* ethernet source */
! 182: LIBNET_802_2_H + ((type == CONF) ? LIBNET_STP_CONF_H :
! 183: LIBNET_STP_TCN_H), /* frame size */
! 184: NULL, /* payload */
! 185: 0, /* payload size */
! 186: l, /* libnet handle */
! 187: 0); /* libnet id */
! 188: if (t == -1)
! 189: {
! 190: fprintf(stderr, "Can't build ethernet header: %s\n",
! 191: libnet_geterror(l));
! 192: goto bad;
! 193: }
! 194: /*
! 195: * Write it to the wire.
! 196: */
! 197: c = libnet_write(l);
! 198:
! 199: if (c == -1)
! 200: {
! 201: fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
! 202: goto bad;
! 203: }
! 204: else
! 205: {
! 206: fprintf(stderr, "Wrote %d byte STP packet; check the wire.\n", c);
! 207: }
! 208: free(dst);
! 209: free(src);
! 210: libnet_destroy(l);
! 211: return (EXIT_SUCCESS);
! 212: bad:
! 213: free(dst);
! 214: free(src);
! 215: libnet_destroy(l);
! 216: return (EXIT_FAILURE);
! 217: }
! 218:
! 219:
! 220: void
! 221: usage(char *name)
! 222: {
! 223: fprintf(stderr, "usage %s -d dst -s src -t -c [-i interface]\n",
! 224: name);
! 225: }
! 226:
! 227: /* EOF */
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