Return to libnet_build_isl.c CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / embedaddon / libnet / src

libnet

    1: /*
    2:  *  $Id: libnet_build_isl.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_isl.c - cisco's inter-switch link assembler
    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: #if (!(_WIN32) || (__CYGWIN__)) 
   37: #include "../include/libnet.h"
   38: #else
   39: #include "../include/win32/libnet.h"
   40: #endif
   41: 
   42: libnet_ptag_t
   43: libnet_build_isl(u_int8_t *dhost, u_int8_t type, u_int8_t user, u_int8_t *shost,
   44:             u_int16_t len, u_int8_t *snap, u_int16_t vid, u_int16_t index,
   45:             u_int16_t reserved, u_int8_t *payload, u_int32_t payload_s,
   46:             libnet_t *l, libnet_ptag_t ptag)
   47: {
   48:     u_int32_t n, h;
   49:     libnet_pblock_t *p;
   50:     struct libnet_isl_hdr isl_hdr;
   51: 
   52:     if (l == NULL)
   53:     {
   54:         return (-1);
   55:     }
   56: 
   57:     n = LIBNET_ISL_H + payload_s;           /* size of memory block */
   58:     h = 0;
   59: 
   60:     /*
   61:      *  Find the existing protocol block if a ptag is specified, or create
   62:      *  a new one.
   63:      */
   64:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ISL_H);
   65:     if (p == NULL)
   66:     {
   67:         return (-1);
   68:     }
   69: 
   70: 	memset(&isl_hdr, 0, sizeof(isl_hdr));
   71: 	memcpy(&isl_hdr.isl_dhost, dhost, 5);
   72:     isl_hdr.isl_type    = type;
   73:     isl_hdr.isl_user    = user;
   74:     memcpy(&isl_hdr.isl_shost, shost, 6);
   75:     isl_hdr.isl_len     = htons(len);
   76:     memcpy(&isl_hdr.isl_dhost, snap, 6);
   77:     isl_hdr.isl_vid     = htons(vid);
   78:     isl_hdr.isl_index   = htons(index);
   79:     isl_hdr.isl_reserved= htons(reserved);
   80: 
   81:     n = libnet_pblock_append(l, p, (u_int8_t *)&isl_hdr, LIBNET_ISL_H);
   82:     if (n == -1)
   83:     {
   84:         goto bad;
   85:     }
   86: 
   87:     if ((payload && !payload_s) || (!payload && payload_s))
   88:     {
   89:          snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   90: 			     "%s(): payload inconsistency\n", __func__);
   91:         goto bad;
   92:     }
   93: 
   94:     if (payload && payload_s)
   95:     {
   96:         n = libnet_pblock_append(l, p, payload, payload_s);
   97:         if (n == -1)
   98:         {
   99:             goto bad;
  100:         }
  101:     }
  102: 
  103:     /* we need to compute the CRC for the ethernet frame and the ISL frame */
  104:     libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
  105:     return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
  106:             LIBNET_PBLOCK_ISL_H));
  107: bad:
  108:     libnet_pblock_delete(l, p);
  109:     return (-1);
  110: }
  111: 
  112: 
  113: /* EOF */