2018-11-24 21:39:18 +00:00
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/*-
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* Copyright (c) 2007 TANDBERG Telecom AS
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* Copyright (c) 2008-2009 Dag-Erling Smørgrav <des@des.no>
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2021-01-12 22:16:18 +00:00
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* Copyright (c) 2017-2021 Carsten Sonne Larsen <cs@innolan.net>
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2018-11-24 21:39:18 +00:00
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#ifndef SNTP_H_INCLUDED
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#define SNTP_H_INCLUDED
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#include "config.h"
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2021-01-12 22:02:29 +00:00
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#include "tz.h"
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2018-11-24 21:39:18 +00:00
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struct sntp;
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/*
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* Structure of an NTP timestamp
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*/
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struct ntptime
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{
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uint32_t sec;
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uint32_t frac;
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};
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/*
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* Useful epochs, in seconds since NTP epoch
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*/
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#define UNIX_EPOCH 2208988800UL /* 1970-01-01 00:00:00 UTC */
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#define UTC_EPOCH 2272060800UL /* 1972-01-01 00:00:00 UTC */
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/* clear a struct ntptime */
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#define nt_zero(nt) \
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(void)((nt).sec = (nt).frac = 0)
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/* comparison macros */
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#define nt_cmp(nt1, op, nt2) \
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((nt1).sec op(nt2).sec && (nt1).frac op(nt2).frac)
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#define nt_lt(nt1, nt2) \
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nt_cmp(nt1, <, nt2)
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#define nt_le(nt1, nt2) \
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nt_cmp(nt1, <=, nt2)
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#define nt_eq(nt1, nt2) \
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nt_cmp(nt1, ==, nt2)
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#define nt_ge(nt1, nt2) \
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nt_cmp(nt1, >=, nt2)
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#define nt_gt(nt1, nt2) \
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nt_cmp(nt1, >, nt2)
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/*
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* Conversion functions
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*/
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void tv2nt(struct timeval *, struct ntptime *);
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void nt2tv(struct ntptime *, struct timeval *);
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void h2n_nt(struct ntptime *);
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void n2h_nt(struct ntptime *);
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/*
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* Error codes
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*/
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typedef enum sntp_err
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{
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SNTP_OK, /* fine */
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SNTP_SYSERR, /* check errno */
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SNTP_DNSERR, /* dns error */
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SNTP_NOREQ, /* no request sent */
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SNTP_NORESP, /* no response received */
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SNTP_BADRESP, /* invalid response received */
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SNTP_LAME, /* server is lame / unsynchronized */
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SNTP_BACKOFF, /* polling too frequently */
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} sntp_err_t;
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/*
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* SNTP client
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*/
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struct sntp *sntp_create(const char *, const char *, const char *, const char *);
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int sntp_open(struct sntp *);
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void sntp_close(struct sntp *);
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void sntp_destroy(struct sntp *);
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sntp_err_t sntp_send(struct sntp *);
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sntp_err_t sntp_pending(struct sntp *);
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sntp_err_t sntp_poll(struct sntp *, int);
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2021-01-12 22:00:49 +00:00
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sntp_err_t sntp_recv(struct sntp *, struct ntptime *, int *);
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2018-11-24 21:39:18 +00:00
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#endif
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