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106 lines
3.2 KiB
106 lines
3.2 KiB
/*- |
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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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* Copyright (c) 2017-2021 Carsten Sonne Larsen <cs@innolan.net> |
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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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#include "tz.h" |
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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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sntp_err_t sntp_recv(struct sntp *, struct ntptime *, int *); |
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#endif
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