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Annotation of embedaddon/libnet/src/libnet_build_ntp.c, revision 1.1.1.3

1.1       misho       1: /*
1.1.1.2   misho       2:  *  $Id: libnet_build_ntp.c,v 1.11 2004/11/09 07:05:07 mike Exp $
1.1       misho       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: 
1.1.1.3 ! misho      33: #include "common.h"
1.1       misho      34: 
                     35: libnet_ptag_t
1.1.1.2   misho      36: libnet_build_ntp(uint8_t leap_indicator, uint8_t version, uint8_t mode,
                     37: uint8_t stratum, uint8_t poll, uint8_t precision, uint16_t delay_int,
                     38: uint16_t delay_frac, uint16_t dispersion_int, uint16_t dispersion_frac,
                     39: uint32_t reference_id, uint32_t ref_ts_int, uint32_t ref_ts_frac,
                     40: uint32_t orig_ts_int, uint32_t orig_ts_frac, uint32_t rec_ts_int,
                     41: uint32_t rec_ts_frac, uint32_t xmt_ts_int, uint32_t xmt_ts_frac,
                     42: const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
1.1       misho      43: {
1.1.1.2   misho      44:     uint32_t n, h;
1.1       misho      45:     libnet_pblock_t *p;
                     46:     struct libnet_ntp_hdr ntp_hdr;
                     47: 
                     48:     if (l == NULL)
                     49:     { 
                     50:         return (-1);
                     51:     } 
                     52: 
                     53:     n = LIBNET_NTP_H + payload_s;
                     54:     h = 0;
                     55: 
                     56:     /*
                     57:      *  Find the existing protocol block if a ptag is specified, or create
                     58:      *  a new one.
                     59:      */
                     60:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_NTP_H);
                     61:     if (p == NULL)
                     62:     {
                     63:         return (-1);
                     64:     }
                     65: 
                     66:     memset(&ntp_hdr, 0, sizeof(ntp_hdr));
                     67:     ntp_hdr.ntp_li_vn_mode          = LIBNET_NTP_DO_LI_VN_MODE(
                     68:                                       leap_indicator, version, mode);
                     69:     ntp_hdr.ntp_stratum             = stratum;
                     70:     ntp_hdr.ntp_poll                = poll;
                     71:     ntp_hdr.ntp_precision           = precision;
                     72:     ntp_hdr.ntp_delay.integer       = htons(delay_int);
                     73:     ntp_hdr.ntp_delay.fraction      = htons(delay_frac);
                     74:     ntp_hdr.ntp_dispersion.integer  = htons(dispersion_int);
                     75:     ntp_hdr.ntp_dispersion.fraction = htons(dispersion_frac);
                     76:     ntp_hdr.ntp_reference_id        = htonl(reference_id);
                     77:     ntp_hdr.ntp_ref_ts.integer      = htonl(ref_ts_int);
                     78:     ntp_hdr.ntp_ref_ts.fraction     = htonl(ref_ts_frac);
                     79:     ntp_hdr.ntp_orig_ts.integer     = htonl(orig_ts_int);
                     80:     ntp_hdr.ntp_orig_ts.fraction    = htonl(orig_ts_frac);
1.1.1.2   misho      81:     ntp_hdr.ntp_rec_ts.integer      = htonl(rec_ts_int);
                     82:     ntp_hdr.ntp_rec_ts.fraction     = htonl(rec_ts_frac);
1.1       misho      83:     ntp_hdr.ntp_xmt_ts.integer      = htonl(xmt_ts_int);
                     84:     ntp_hdr.ntp_xmt_ts.fraction     = htonl(xmt_ts_frac);
                     85: 
1.1.1.2   misho      86:     n = libnet_pblock_append(l, p, (uint8_t *)&ntp_hdr, LIBNET_NTP_H);
1.1       misho      87:     if (n == -1)
                     88:     {
                     89:         goto bad;
                     90:     }
                     91: 
1.1.1.2   misho      92:     /* boilerplate payload sanity check / append macro */
                     93:     LIBNET_DO_PAYLOAD(l, p);
1.1       misho      94: 
                     95:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_NTP_H));
                     96: bad:
                     97:     libnet_pblock_delete(l, p);
                     98:     return (-1);
                     99: }
                    100: 
1.1.1.3 ! misho     101: /**
        !           102:  * Local Variables:
        !           103:  *  indent-tabs-mode: nil
        !           104:  *  c-file-style: "stroustrup"
        !           105:  * End:
        !           106:  */