Return to libnet_build_ntp.c CVS log

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

Annotation of embedaddon/libnet/src/libnet_build_ntp.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  *  $Id: libnet_build_ntp.c,v 1.9 2004/03/01 20:26:12 mike 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 */