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