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    1: /*
    2:  *  $Id: libnet_build_ntp.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_ntp.c - NTP 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_ntp(u_int8_t leap_indicator, u_int8_t version, u_int8_t mode,
   44: u_int8_t stratum, u_int8_t poll, u_int8_t precision, u_int16_t delay_int,
   45: u_int16_t delay_frac, u_int16_t dispersion_int, u_int16_t dispersion_frac,
   46: u_int32_t reference_id, u_int32_t ref_ts_int, u_int32_t ref_ts_frac,
   47: u_int32_t orig_ts_int, u_int32_t orig_ts_frac, u_int32_t rec_ts_int,
   48: u_int32_t rec_ts_frac, u_int32_t xmt_ts_int, u_int32_t xmt_ts_frac,
   49: u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   50: {
   51:     u_int32_t n, h;
   52:     libnet_pblock_t *p;
   53:     struct libnet_ntp_hdr ntp_hdr;
   54: 
   55:     if (l == NULL)
   56:     { 
   57:         return (-1);
   58:     } 
   59: 
   60:     n = LIBNET_NTP_H + payload_s;
   61:     h = 0;
   62: 
   63:     /*
   64:      *  Find the existing protocol block if a ptag is specified, or create
   65:      *  a new one.
   66:      */
   67:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_NTP_H);
   68:     if (p == NULL)
   69:     {
   70:         return (-1);
   71:     }
   72: 
   73:     memset(&ntp_hdr, 0, sizeof(ntp_hdr));
   74:     ntp_hdr.ntp_li_vn_mode          = LIBNET_NTP_DO_LI_VN_MODE(
   75:                                       leap_indicator, version, mode);
   76:     ntp_hdr.ntp_stratum             = stratum;
   77:     ntp_hdr.ntp_poll                = poll;
   78:     ntp_hdr.ntp_precision           = precision;
   79:     ntp_hdr.ntp_delay.integer       = htons(delay_int);
   80:     ntp_hdr.ntp_delay.fraction      = htons(delay_frac);
   81:     ntp_hdr.ntp_dispersion.integer  = htons(dispersion_int);
   82:     ntp_hdr.ntp_dispersion.fraction = htons(dispersion_frac);
   83:     ntp_hdr.ntp_reference_id        = htonl(reference_id);
   84:     ntp_hdr.ntp_ref_ts.integer      = htonl(ref_ts_int);
   85:     ntp_hdr.ntp_ref_ts.fraction     = htonl(ref_ts_frac);
   86:     ntp_hdr.ntp_orig_ts.integer     = htonl(orig_ts_int);
   87:     ntp_hdr.ntp_orig_ts.fraction    = htonl(orig_ts_frac);
   88:     ntp_hdr.ntp_rec_ts.integer      = htonl(orig_ts_int);
   89:     ntp_hdr.ntp_rec_ts.fraction     = htonl(orig_ts_frac);
   90:     ntp_hdr.ntp_xmt_ts.integer      = htonl(xmt_ts_int);
   91:     ntp_hdr.ntp_xmt_ts.fraction     = htonl(xmt_ts_frac);
   92: 
   93:     n = libnet_pblock_append(l, p, (u_int8_t *)&ntp_hdr, LIBNET_NTP_H);
   94:     if (n == -1)
   95:     {
   96:         goto bad;
   97:     }
   98: 
   99:     if ((payload && !payload_s) || (!payload && payload_s))
  100:     {
  101:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
  102:                 "%s(): payload inconsistency\n", __func__);
  103:         goto bad;
  104:     }
  105: 
  106:     if (payload && payload_s)
  107:     {
  108:         n = libnet_pblock_append(l, p, payload, payload_s);
  109:         if (n == -1)
  110:         {
  111:             goto bad;
  112:         }
  113:     }
  114: 
  115:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_NTP_H));
  116: bad:
  117:     libnet_pblock_delete(l, p);
  118:     return (-1);
  119: }
  120: 
  121: /* EOF */