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libnet

    1: /*
    2:  *  libnet
    3:  *  libnet_build_sebek.c - sebek packet assembler
    4:  *
    5:  *  Copyright (c) 2004 Frederic Raynal <pappy@security-labs.org>
    6:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    7:  *  All rights reserved.
    8:  *
    9:  * Redistribution and use in source and binary forms, with or without
   10:  * modification, are permitted provided that the following conditions
   11:  * are met:
   12:  * 1. Redistributions of source code must retain the above copyright
   13:  *    notice, this list of conditions and the following disclaimer.
   14:  * 2. Redistributions in binary form must reproduce the above copyright
   15:  *    notice, this list of conditions and the following disclaimer in the
   16:  *    documentation and/or other materials provided with the distribution.
   17:  *
   18:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28:  * SUCH DAMAGE.
   29:  *
   30:  */
   31: 
   32: #if (HAVE_CONFIG_H)
   33: #include "../include/config.h"
   34: #endif
   35: #if (!(_WIN32) || (__CYGWIN__)) 
   36: #include "../include/libnet.h"
   37: #else
   38: #include "../include/win32/libnet.h"
   39: #endif
   40: 
   41: libnet_ptag_t
   42: libnet_build_sebek(u_int32_t magic, u_int16_t version, u_int16_t type, 
   43: u_int32_t counter, u_int32_t time_sec, u_int32_t time_usec, u_int32_t pid,
   44: u_int32_t uid, u_int32_t fd, u_int8_t cmd[SEBEK_CMD_LENGTH], u_int32_t length,
   45: u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   46: {
   47:     u_int32_t n;
   48:     libnet_pblock_t *p;
   49:     struct libnet_sebek_hdr sebek_hdr;
   50: 
   51:     if (l == NULL)
   52:     { 
   53:         return (-1);
   54:     } 
   55: 
   56:     n = LIBNET_SEBEK_H + payload_s;               /* size of memory block */
   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_SEBEK_H);
   63:     if (p == NULL)
   64:     {
   65:         return (-1);
   66:     }
   67: 
   68:     memset(&sebek_hdr, 0, sizeof(sebek_hdr));
   69:     sebek_hdr.magic     = htonl(magic);
   70:     sebek_hdr.version   = htons(version);
   71:     sebek_hdr.type      = htons(type);
   72:     sebek_hdr.counter   = htonl(counter);
   73:     sebek_hdr.time_sec  = htonl(time_sec);
   74:     sebek_hdr.time_usec = htonl(time_usec);
   75:     sebek_hdr.pid       = htonl(pid);
   76:     sebek_hdr.uid       = htonl(uid);
   77:     sebek_hdr.fd        = htonl(fd);
   78:     memcpy(sebek_hdr.cmd, cmd, SEBEK_CMD_LENGTH*sizeof(u_int8_t));
   79:     sebek_hdr.length = htonl(length);
   80: 
   81:     n = libnet_pblock_append(l, p, (u_int8_t *)&sebek_hdr, LIBNET_SEBEK_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:     return (ptag ? ptag : libnet_pblock_update(l, p, 0, LIBNET_PBLOCK_SEBEK_H));
  104: bad:
  105:     libnet_pblock_delete(l, p);
  106:     return (-1);
  107: }
  108: /* EOF */