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libnet

    1: /*
    2:  *  $Id: libnet_advanced.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_advanced.c - Advanced routines
    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: int
   43: libnet_adv_cull_packet(libnet_t *l, u_int8_t **packet, u_int32_t *packet_s)
   44: {
   45:     *packet = NULL;
   46:     *packet_s = 0;
   47: 
   48:     if (l->injection_type != LIBNET_LINK_ADV)
   49:     {
   50:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   51:                 "%s(): advanced link mode not enabled\n", __func__);
   52:         return (-1);
   53:     }
   54: 
   55:     /* checksums will be written in */
   56:     return (libnet_pblock_coalesce(l, packet, packet_s));
   57: }
   58: 
   59: int
   60: libnet_adv_cull_header(libnet_t *l, libnet_ptag_t ptag, u_int8_t **header,
   61:         u_int32_t *header_s)
   62: {
   63:     libnet_pblock_t *p;
   64: 
   65:     *header = NULL;
   66:     *header_s = 0;
   67: 
   68:     if (l->injection_type != LIBNET_LINK_ADV)
   69:     {
   70:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   71:                 "%s(): advanced link mode not enabled\n", __func__);
   72:         return (-1);
   73:     }
   74: 
   75:     p = libnet_pblock_find(l, ptag);
   76:     if (p == NULL)
   77:     {
   78:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   79:             "%s(): ptag not found, you sure it exists?\n", __func__);
   80:         return (-1);
   81:     }
   82:     *header   = p->buf;
   83:     *header_s = p->b_len;
   84: 
   85:     return (1);
   86: }
   87: 
   88: int
   89: libnet_adv_write_link(libnet_t *l, u_int8_t *packet, u_int32_t packet_s)
   90: {
   91:     int c;
   92: 
   93:     if (l->injection_type != LIBNET_LINK_ADV)
   94:     {
   95:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   96:                 "%s(): advanced link mode not enabled\n", __func__);
   97:         return (-1);
   98:     }
   99:     c = libnet_write_link(l, packet, packet_s);
  100: 
  101:     /* do statistics */
  102:     if (c == packet_s)
  103:     {
  104:         l->stats.packets_sent++;
  105:         l->stats.bytes_written += c;
  106:     }
  107:     else
  108:     {
  109:         l->stats.packet_errors++;
  110:         /*
  111:          *  XXX - we probably should have a way to retrieve the number of
  112:          *  bytes actually written (since we might have written something).
  113:          */
  114:         if (c > 0)
  115:         {
  116:             l->stats.bytes_written += c;
  117:         }
  118:     }
  119:     return (c);
  120: }
  121: 
  122: void
  123: libnet_adv_free_packet(libnet_t *l, u_int8_t *packet)
  124: {
  125:     /*
  126:      *  Restore original pointer address so free won't complain about a
  127:      *  modified chunk pointer.
  128:      */
  129:     if (l->aligner > 0)
  130:     {
  131:         packet = packet - l->aligner;
  132:     }
  133:     free(packet);
  134: }
  135: 
  136: /* EOF */