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    1: /*
    2:  *  $Id: libnet_build_802.2.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_802.2.c - 802.2 packet 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_802_2(u_int8_t dsap, u_int8_t ssap, u_int8_t control, 
   44: u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   45: {
   46:     u_int32_t n, h;
   47:     libnet_pblock_t *p;
   48:     struct libnet_802_2_hdr _802_2_hdr;
   49: 
   50:     if (l == NULL)
   51:     { 
   52:         return (-1);
   53:     } 
   54: 
   55:     n = LIBNET_802_2_H + payload_s;
   56:     h = 0;
   57:  
   58:     /*
   59:      *  Find the existing protocol block if a ptag is specified, or create
   60:      *  a new one.
   61:      */
   62:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_802_2_H);
   63:     if (p == NULL)
   64:     {
   65:         return (-1);
   66:     }
   67: 
   68:     memset(&_802_2_hdr, 0, sizeof(_802_2_hdr));
   69:     _802_2_hdr.llc_dsap = dsap;
   70:     _802_2_hdr.llc_ssap = ssap;
   71:     _802_2_hdr.llc_control = control;
   72: 
   73:     n = libnet_pblock_append(l, p, (u_int8_t *)&_802_2_hdr, LIBNET_802_2_H);
   74:     if (n == -1)
   75:     {
   76:         goto bad;
   77:     }
   78: 
   79:     if ((payload && !payload_s) || (!payload && payload_s))
   80:     {
   81:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   82:                 "%s(): payload inconsistency\n", __func__);
   83:         goto bad;
   84:     }
   85:  
   86:     if (payload && payload_s)
   87:     {
   88:         n = libnet_pblock_append(l, p, payload, payload_s);
   89:         if (n == -1)
   90:         {
   91:             goto bad;
   92:         }
   93:     }
   94: 
   95:     return (ptag ? ptag : libnet_pblock_update(l, p, h,
   96:             LIBNET_PBLOCK_802_2_H));
   97: bad:
   98:     libnet_pblock_delete(l, p);
   99:     return (-1);
  100: }
  101: 
  102: 
  103: libnet_ptag_t
  104: libnet_build_802_2snap(u_int8_t dsap, u_int8_t ssap, u_int8_t control, u_int8_t *oui,
  105:             u_int16_t type, u_int8_t *payload, u_int32_t payload_s, libnet_t *l,
  106:             libnet_ptag_t ptag)
  107: {
  108:     u_int32_t n, h;
  109:     libnet_pblock_t *p;
  110:     struct libnet_802_2snap_hdr _802_2_hdr;
  111: 
  112:     if (l == NULL)
  113:     { 
  114:         return (-1);
  115:     } 
  116: 
  117:     n = LIBNET_802_2SNAP_H + payload_s;
  118:     h = 0;
  119:  
  120:     /*
  121:      *  Find the existing protocol block if a ptag is specified, or create
  122:      *  a new one.
  123:      */
  124:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_802_2SNAP_H);
  125:     if (p == NULL)
  126:     {
  127:         return (-1);
  128:     }
  129: 
  130: 	memset(&_802_2_hdr, 0, sizeof(_802_2_hdr));
  131: 	_802_2_hdr.snap_dsap = dsap;
  132:     _802_2_hdr.snap_ssap = ssap;
  133:     _802_2_hdr.snap_control = control;
  134:     memcpy(_802_2_hdr.snap_oui, oui, 3);
  135:     _802_2_hdr.snap_type = htons(type);
  136: 
  137:     n = libnet_pblock_append(l, p, (u_int8_t *)&_802_2_hdr, LIBNET_802_2SNAP_H);
  138:     if (n == -1)
  139:     {
  140:         goto bad;
  141:     }
  142:  
  143:     if ((payload && !payload_s) || (!payload && payload_s))
  144:     {
  145:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
  146:                 "%s(): payload inconsistency\n", __func__);
  147:         goto bad;
  148:     }
  149: 
  150:     if (payload && payload_s)
  151:     {
  152:         n = libnet_pblock_append(l, p, payload, payload_s);
  153:         if (n == -1)
  154:         {
  155:             goto bad;
  156:         }
  157:     }
  158: 
  159:     return (ptag ? ptag : libnet_pblock_update(l, p, h,
  160:             LIBNET_PBLOCK_802_2SNAP_H));
  161: bad:
  162:     libnet_pblock_delete(l, p);
  163:     return (-1);
  164: }
  165: 
  166: 
  167: /* EOF */