2020-10-26 12:35:25 +00:00
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/**
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* @file
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* SNTP client module
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*/
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/*
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* Copyright (c) 2007-2009 Frédéric Bernon, Simon Goldschmidt
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* This file is part of the lwIP TCP/IP stack.
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*
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* Author: Frédéric Bernon, Simon Goldschmidt
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*/
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/**
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* @defgroup sntp SNTP
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* @ingroup apps
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*
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* This is simple "SNTP" client for the lwIP raw API.
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* It is a minimal implementation of SNTPv4 as specified in RFC 4330.
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*
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* For a list of some public NTP servers, see this link:
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* http://support.ntp.org/bin/view/Servers/NTPPoolServers
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*
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* @todo:
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* - complete SNTP_CHECK_RESPONSE checks 3 and 4
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*/
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#include <FreeRTOS.h>
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#include <task.h>
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#include "lwip/apps/sntp.h"
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#include "lwip/opt.h"
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#include "lwip/timeouts.h"
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#include "lwip/udp.h"
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#include "lwip/dns.h"
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#include "lwip/ip_addr.h"
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#include "lwip/pbuf.h"
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#include "lwip/dhcp.h"
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#include <string.h>
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#include <time.h>
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#include <bl_sys_time.h>
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#if LWIP_UDP
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/* Handle support for more than one server via SNTP_MAX_SERVERS */
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#if SNTP_MAX_SERVERS > 1
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#define SNTP_SUPPORT_MULTIPLE_SERVERS 1
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#else /* NTP_MAX_SERVERS > 1 */
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#define SNTP_SUPPORT_MULTIPLE_SERVERS 0
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#endif /* NTP_MAX_SERVERS > 1 */
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#ifndef SNTP_SUPPRESS_DELAY_CHECK
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#if SNTP_UPDATE_DELAY < 15000
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#error "SNTPv4 RFC 4330 enforces a minimum update time of 15 seconds (define SNTP_SUPPRESS_DELAY_CHECK to disable this error)!"
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#endif
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#endif
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/* the various debug levels for this file */
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#define SNTP_DEBUG_TRACE (SNTP_DEBUG | LWIP_DBG_TRACE)
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#define SNTP_DEBUG_STATE (SNTP_DEBUG | LWIP_DBG_STATE)
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#define SNTP_DEBUG_WARN (SNTP_DEBUG | LWIP_DBG_LEVEL_WARNING)
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#define SNTP_DEBUG_WARN_STATE (SNTP_DEBUG | LWIP_DBG_LEVEL_WARNING | LWIP_DBG_STATE)
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#define SNTP_DEBUG_SERIOUS (SNTP_DEBUG | LWIP_DBG_LEVEL_SERIOUS)
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#define SNTP_ERR_KOD 1
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/* SNTP protocol defines */
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#define SNTP_MSG_LEN 48
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#define SNTP_OFFSET_LI_VN_MODE 0
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#define SNTP_LI_MASK 0xC0
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#define SNTP_LI_NO_WARNING (0x00 << 6)
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#define SNTP_LI_LAST_MINUTE_61_SEC (0x01 << 6)
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#define SNTP_LI_LAST_MINUTE_59_SEC (0x02 << 6)
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#define SNTP_LI_ALARM_CONDITION (0x03 << 6) /* (clock not synchronized) */
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#define SNTP_VERSION_MASK 0x38
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#define SNTP_VERSION (4/* NTP Version 4*/<<3)
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#define SNTP_MODE_MASK 0x07
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#define SNTP_MODE_CLIENT 0x03
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#define SNTP_MODE_SERVER 0x04
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#define SNTP_MODE_BROADCAST 0x05
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#define SNTP_OFFSET_STRATUM 1
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#define SNTP_STRATUM_KOD 0x00
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#define SNTP_OFFSET_ORIGINATE_TIME 24
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#define SNTP_OFFSET_RECEIVE_TIME 32
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#define SNTP_OFFSET_TRANSMIT_TIME 40
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/* Number of seconds between 1970 and Feb 7, 2036 06:28:16 UTC (epoch 1) */
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#define DIFF_SEC_1970_2036 ((u32_t)2085978496L)
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/** Convert NTP timestamp fraction to microseconds.
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*/
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#ifndef SNTP_FRAC_TO_US
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# if LWIP_HAVE_INT64
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# define SNTP_FRAC_TO_US(f) ((u32_t)(((u64_t)(f) * 1000000UL) >> 32))
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# else
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# define SNTP_FRAC_TO_US(f) ((u32_t)(f) / 4295)
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# endif
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#endif /* !SNTP_FRAC_TO_US */
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/* Configure behaviour depending on native, microsecond or second precision.
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* Treat NTP timestamps as signed two's-complement integers. This way,
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* timestamps that have the MSB set simply become negative offsets from
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* the epoch (Feb 7, 2036 06:28:16 UTC). Representable dates range from
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* 1968 to 2104.
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*/
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#ifndef SNTP_SET_SYSTEM_TIME_NTP
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# ifdef SNTP_SET_SYSTEM_TIME_US
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# define SNTP_SET_SYSTEM_TIME_NTP(s, f) \
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SNTP_SET_SYSTEM_TIME_US((u32_t)((s) + DIFF_SEC_1970_2036), SNTP_FRAC_TO_US(f))
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# else
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# define SNTP_SET_SYSTEM_TIME_NTP(s, f) \
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SNTP_SET_SYSTEM_TIME((u32_t)((s) + DIFF_SEC_1970_2036))
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# endif
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#endif /* !SNTP_SET_SYSTEM_TIME_NTP */
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/* Get the system time either natively as NTP timestamp or convert from
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* Unix time in seconds and microseconds. Take care to avoid overflow if the
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* microsecond value is at the maximum of 999999. Also add 0.5 us fudge to
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* avoid special values like 0, and to mask round-off errors that would
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* otherwise break round-trip conversion identity.
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*/
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#ifndef SNTP_GET_SYSTEM_TIME_NTP
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# define SNTP_GET_SYSTEM_TIME_NTP(s, f) do { \
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u32_t sec_, usec_; \
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SNTP_GET_SYSTEM_TIME(sec_, usec_); \
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(s) = (s32_t)(sec_ - DIFF_SEC_1970_2036); \
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(f) = usec_ * 4295 - ((usec_ * 2143) >> 16) + 2147; \
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} while (0)
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#endif /* !SNTP_GET_SYSTEM_TIME_NTP */
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/* Start offset of the timestamps to extract from the SNTP packet */
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#define SNTP_OFFSET_TIMESTAMPS \
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(SNTP_OFFSET_TRANSMIT_TIME + 8 - sizeof(struct sntp_timestamps))
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/* Round-trip delay arithmetic helpers */
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#if SNTP_COMP_ROUNDTRIP
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# if !LWIP_HAVE_INT64
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# error "SNTP round-trip delay compensation requires 64-bit arithmetic"
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# endif
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# define SNTP_SEC_FRAC_TO_S64(s, f) \
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((s64_t)(((u64_t)(s) << 32) | (u32_t)(f)))
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# define SNTP_TIMESTAMP_TO_S64(t) \
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SNTP_SEC_FRAC_TO_S64(lwip_ntohl((t).sec), lwip_ntohl((t).frac))
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#endif /* SNTP_COMP_ROUNDTRIP */
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/**
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* 64-bit NTP timestamp, in network byte order.
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*/
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struct sntp_time {
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u32_t sec;
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u32_t frac;
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};
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/**
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* Timestamps to be extracted from the NTP header.
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*/
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struct sntp_timestamps {
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#if SNTP_COMP_ROUNDTRIP || SNTP_CHECK_RESPONSE >= 2
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struct sntp_time orig;
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struct sntp_time recv;
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#endif
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struct sntp_time xmit;
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};
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/**
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* SNTP packet format (without optional fields)
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* Timestamps are coded as 64 bits:
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* - signed 32 bits seconds since Feb 07, 2036, 06:28:16 UTC (epoch 1)
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* - unsigned 32 bits seconds fraction (2^32 = 1 second)
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*/
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/bpstruct.h"
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#endif
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PACK_STRUCT_BEGIN
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struct sntp_msg {
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PACK_STRUCT_FLD_8(u8_t li_vn_mode);
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PACK_STRUCT_FLD_8(u8_t stratum);
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PACK_STRUCT_FLD_8(u8_t poll);
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PACK_STRUCT_FLD_8(u8_t precision);
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PACK_STRUCT_FIELD(u32_t root_delay);
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PACK_STRUCT_FIELD(u32_t root_dispersion);
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PACK_STRUCT_FIELD(u32_t reference_identifier);
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PACK_STRUCT_FIELD(u32_t reference_timestamp[2]);
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PACK_STRUCT_FIELD(u32_t originate_timestamp[2]);
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PACK_STRUCT_FIELD(u32_t receive_timestamp[2]);
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PACK_STRUCT_FIELD(u32_t transmit_timestamp[2]);
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} PACK_STRUCT_STRUCT;
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PACK_STRUCT_END
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#ifdef PACK_STRUCT_USE_INCLUDES
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# include "arch/epstruct.h"
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#endif
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/* function prototypes */
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static void sntp_request(void *arg);
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/** The operating mode */
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static u8_t sntp_opmode;
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/** The UDP pcb used by the SNTP client */
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static struct udp_pcb *sntp_pcb;
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/** Names/Addresses of servers */
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struct sntp_server {
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#if SNTP_SERVER_DNS
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const char *name;
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#endif /* SNTP_SERVER_DNS */
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ip_addr_t addr;
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#if SNTP_MONITOR_SERVER_REACHABILITY
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/** Reachability shift register as described in RFC 5905 */
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u8_t reachability;
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#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
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};
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static struct sntp_server sntp_servers[SNTP_MAX_SERVERS];
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#if SNTP_GET_SERVERS_FROM_DHCP
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static u8_t sntp_set_servers_from_dhcp;
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#endif /* SNTP_GET_SERVERS_FROM_DHCP */
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#if SNTP_SUPPORT_MULTIPLE_SERVERS
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/** The currently used server (initialized to 0) */
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static u8_t sntp_current_server;
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#else /* SNTP_SUPPORT_MULTIPLE_SERVERS */
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#define sntp_current_server 0
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#endif /* SNTP_SUPPORT_MULTIPLE_SERVERS */
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#if SNTP_RETRY_TIMEOUT_EXP
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#define SNTP_RESET_RETRY_TIMEOUT() sntp_retry_timeout = SNTP_RETRY_TIMEOUT
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/** Retry time, initialized with SNTP_RETRY_TIMEOUT and doubled with each retry. */
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static u32_t sntp_retry_timeout;
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#else /* SNTP_RETRY_TIMEOUT_EXP */
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#define SNTP_RESET_RETRY_TIMEOUT()
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#define sntp_retry_timeout SNTP_RETRY_TIMEOUT
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#endif /* SNTP_RETRY_TIMEOUT_EXP */
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#if SNTP_CHECK_RESPONSE >= 1
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/** Saves the last server address to compare with response */
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static ip_addr_t sntp_last_server_address;
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#endif /* SNTP_CHECK_RESPONSE >= 1 */
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#if SNTP_CHECK_RESPONSE >= 2
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/** Saves the last timestamp sent (which is sent back by the server)
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* to compare against in response. Stored in network byte order. */
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static struct sntp_time sntp_last_timestamp_sent;
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#endif /* SNTP_CHECK_RESPONSE >= 2 */
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#if defined(LWIP_DEBUG) && !defined(sntp_format_time)
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/* Debug print helper. */
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static const char *
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sntp_format_time(s32_t sec)
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{
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time_t ut;
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ut = (u32_t)((u32_t)sec + DIFF_SEC_1970_2036);
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return ctime(&ut);
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}
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#endif /* LWIP_DEBUG && !sntp_format_time */
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static uint32_t ntp_sec, ntp_frag, time_obtained;
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/**
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* SNTP processing of received timestamp
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*/
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static void
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sntp_process(const struct sntp_timestamps *timestamps)
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{
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s32_t sec;
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u32_t frac;
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sec = (s32_t)lwip_ntohl(timestamps->xmit.sec);
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frac = lwip_ntohl(timestamps->xmit.frac);
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printf("Processing...\r\n");
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#if SNTP_COMP_ROUNDTRIP
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# if SNTP_CHECK_RESPONSE >= 2
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if (timestamps->recv.sec != 0 || timestamps->recv.frac != 0)
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# endif
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{
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s32_t dest_sec;
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u32_t dest_frac;
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u32_t step_sec;
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/* Get the destination time stamp, i.e. the current system time */
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SNTP_GET_SYSTEM_TIME_NTP(dest_sec, dest_frac);
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step_sec = (dest_sec < sec) ? ((u32_t)sec - (u32_t)dest_sec)
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: ((u32_t)dest_sec - (u32_t)sec);
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/* In order to avoid overflows, skip the compensation if the clock step
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* is larger than about 34 years. */
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if ((step_sec >> 30) == 0) {
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s64_t t1, t2, t3, t4;
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t4 = SNTP_SEC_FRAC_TO_S64(dest_sec, dest_frac);
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t3 = SNTP_SEC_FRAC_TO_S64(sec, frac);
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t1 = SNTP_TIMESTAMP_TO_S64(timestamps->orig);
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t2 = SNTP_TIMESTAMP_TO_S64(timestamps->recv);
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/* Clock offset calculation according to RFC 4330 */
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t4 += ((t2 - t1) + (t3 - t4)) / 2;
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sec = (s32_t)((u64_t)t4 >> 32);
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frac = (u32_t)((u64_t)t4);
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}
|
|
|
|
}
|
|
|
|
#endif /* SNTP_COMP_ROUNDTRIP */
|
|
|
|
|
|
|
|
SNTP_SET_SYSTEM_TIME_NTP(sec, frac);
|
|
|
|
|
|
|
|
taskENTER_CRITICAL();
|
|
|
|
ntp_sec = sec + DIFF_SEC_1970_2036;
|
|
|
|
ntp_frag = frac;
|
|
|
|
time_obtained = xTaskGetTickCount();
|
|
|
|
bl_sys_time_update(((uint64_t)ntp_sec) * 1000 + ntp_frag / 1000);
|
|
|
|
taskEXIT_CRITICAL();
|
|
|
|
|
|
|
|
LWIP_UNUSED_ARG(frac); /* might be unused if only seconds are set */
|
|
|
|
printf("sntp_process: %ld, %" U32_F " us\r\n", sec + DIFF_SEC_1970_2036, SNTP_FRAC_TO_US(frac));
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Initialize request struct to be sent to server.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_initialize_request(struct sntp_msg *req)
|
|
|
|
{
|
|
|
|
memset(req, 0, SNTP_MSG_LEN);
|
|
|
|
req->li_vn_mode = SNTP_LI_NO_WARNING | SNTP_VERSION | SNTP_MODE_CLIENT;
|
|
|
|
|
|
|
|
#if SNTP_CHECK_RESPONSE >= 2 || SNTP_COMP_ROUNDTRIP
|
|
|
|
{
|
|
|
|
s32_t secs;
|
|
|
|
u32_t sec, frac;
|
|
|
|
/* Get the transmit timestamp */
|
|
|
|
SNTP_GET_SYSTEM_TIME_NTP(secs, frac);
|
|
|
|
sec = lwip_htonl((u32_t)secs);
|
|
|
|
frac = lwip_htonl(frac);
|
|
|
|
|
|
|
|
# if SNTP_CHECK_RESPONSE >= 2
|
|
|
|
sntp_last_timestamp_sent.sec = sec;
|
|
|
|
sntp_last_timestamp_sent.frac = frac;
|
|
|
|
# endif
|
|
|
|
req->transmit_timestamp[0] = sec;
|
|
|
|
req->transmit_timestamp[1] = frac;
|
|
|
|
}
|
|
|
|
#endif /* SNTP_CHECK_RESPONSE >= 2 || SNTP_COMP_ROUNDTRIP */
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Retry: send a new request (and increase retry timeout).
|
|
|
|
*
|
|
|
|
* @param arg is unused (only necessary to conform to sys_timeout)
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_retry(void *arg)
|
|
|
|
{
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_retry: Next request will be sent in %"U32_F" ms\n",
|
|
|
|
sntp_retry_timeout));
|
|
|
|
|
|
|
|
/* set up a timer to send a retry and increase the retry delay */
|
|
|
|
sys_timeout(sntp_retry_timeout, sntp_request, NULL);
|
|
|
|
|
|
|
|
#if SNTP_RETRY_TIMEOUT_EXP
|
|
|
|
{
|
|
|
|
u32_t new_retry_timeout;
|
|
|
|
/* increase the timeout for next retry */
|
|
|
|
new_retry_timeout = sntp_retry_timeout << 1;
|
|
|
|
/* limit to maximum timeout and prevent overflow */
|
|
|
|
if ((new_retry_timeout <= SNTP_RETRY_TIMEOUT_MAX) &&
|
|
|
|
(new_retry_timeout > sntp_retry_timeout)) {
|
|
|
|
sntp_retry_timeout = new_retry_timeout;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* SNTP_RETRY_TIMEOUT_EXP */
|
|
|
|
}
|
|
|
|
|
|
|
|
#if SNTP_SUPPORT_MULTIPLE_SERVERS
|
|
|
|
/**
|
|
|
|
* If Kiss-of-Death is received (or another packet parsing error),
|
|
|
|
* try the next server or retry the current server and increase the retry
|
|
|
|
* timeout if only one server is available.
|
|
|
|
* (implicitly, SNTP_MAX_SERVERS > 1)
|
|
|
|
*
|
|
|
|
* @param arg is unused (only necessary to conform to sys_timeout)
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_try_next_server(void *arg)
|
|
|
|
{
|
|
|
|
u8_t old_server, i;
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
|
|
|
|
old_server = sntp_current_server;
|
|
|
|
for (i = 0; i < SNTP_MAX_SERVERS - 1; i++) {
|
|
|
|
sntp_current_server++;
|
|
|
|
if (sntp_current_server >= SNTP_MAX_SERVERS) {
|
|
|
|
sntp_current_server = 0;
|
|
|
|
}
|
|
|
|
if (!ip_addr_isany(&sntp_servers[sntp_current_server].addr)
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
|| (sntp_servers[sntp_current_server].name != NULL)
|
|
|
|
#endif
|
|
|
|
) {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_try_next_server: Sending request to server %"U16_F"\n",
|
|
|
|
(u16_t)sntp_current_server));
|
|
|
|
/* new server: reset retry timeout */
|
|
|
|
SNTP_RESET_RETRY_TIMEOUT();
|
|
|
|
/* instantly send a request to the next server */
|
|
|
|
sntp_request(NULL);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/* no other valid server found */
|
|
|
|
sntp_current_server = old_server;
|
|
|
|
sntp_retry(NULL);
|
|
|
|
}
|
|
|
|
#else /* SNTP_SUPPORT_MULTIPLE_SERVERS */
|
|
|
|
/* Always retry on error if only one server is supported */
|
|
|
|
#define sntp_try_next_server sntp_retry
|
|
|
|
#endif /* SNTP_SUPPORT_MULTIPLE_SERVERS */
|
|
|
|
|
|
|
|
/** UDP recv callback for the sntp pcb */
|
|
|
|
static void
|
|
|
|
sntp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
|
|
|
|
{
|
|
|
|
struct sntp_timestamps timestamps;
|
|
|
|
u8_t mode;
|
|
|
|
u8_t stratum;
|
|
|
|
err_t err;
|
2020-11-08 19:56:51 +00:00
|
|
|
|
2020-10-26 12:35:25 +00:00
|
|
|
printf("SNTP time now\r\n");
|
|
|
|
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
LWIP_UNUSED_ARG(pcb);
|
|
|
|
|
|
|
|
err = ERR_ARG;
|
|
|
|
#if SNTP_CHECK_RESPONSE >= 1
|
|
|
|
/* check server address and port */
|
|
|
|
if (((sntp_opmode != SNTP_OPMODE_POLL) || ip_addr_cmp(addr, &sntp_last_server_address)) &&
|
|
|
|
(port == SNTP_PORT))
|
|
|
|
#else /* SNTP_CHECK_RESPONSE >= 1 */
|
|
|
|
LWIP_UNUSED_ARG(addr);
|
|
|
|
LWIP_UNUSED_ARG(port);
|
|
|
|
#endif /* SNTP_CHECK_RESPONSE >= 1 */
|
|
|
|
{
|
|
|
|
/* process the response */
|
|
|
|
if (p->tot_len == SNTP_MSG_LEN) {
|
|
|
|
mode = pbuf_get_at(p, SNTP_OFFSET_LI_VN_MODE) & SNTP_MODE_MASK;
|
|
|
|
/* if this is a SNTP response... */
|
|
|
|
if (((sntp_opmode == SNTP_OPMODE_POLL) && (mode == SNTP_MODE_SERVER)) ||
|
|
|
|
((sntp_opmode == SNTP_OPMODE_LISTENONLY) && (mode == SNTP_MODE_BROADCAST))) {
|
|
|
|
stratum = pbuf_get_at(p, SNTP_OFFSET_STRATUM);
|
|
|
|
|
|
|
|
if (stratum == SNTP_STRATUM_KOD) {
|
|
|
|
/* Kiss-of-death packet. Use another server or increase UPDATE_DELAY. */
|
|
|
|
err = SNTP_ERR_KOD;
|
|
|
|
printf("sntp_recv: Received Kiss-of-Death\r\n");
|
|
|
|
} else {
|
|
|
|
pbuf_copy_partial(p, ×tamps, sizeof(timestamps), SNTP_OFFSET_TIMESTAMPS);
|
|
|
|
#if SNTP_CHECK_RESPONSE >= 2
|
|
|
|
/* check originate_timetamp against sntp_last_timestamp_sent */
|
|
|
|
if (timestamps.orig.sec != sntp_last_timestamp_sent.sec ||
|
|
|
|
timestamps.orig.frac != sntp_last_timestamp_sent.frac) {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_WARN,
|
|
|
|
("sntp_recv: Invalid originate timestamp in response\n"));
|
|
|
|
} else
|
|
|
|
#endif /* SNTP_CHECK_RESPONSE >= 2 */
|
|
|
|
/* @todo: add code for SNTP_CHECK_RESPONSE >= 3 and >= 4 here */
|
|
|
|
{
|
|
|
|
/* correct answer */
|
|
|
|
err = ERR_OK;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_WARN, ("sntp_recv: Invalid mode in response: %"U16_F"\n", (u16_t)mode));
|
|
|
|
/* wait for correct response */
|
|
|
|
err = ERR_TIMEOUT;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_WARN, ("sntp_recv: Invalid packet length: %"U16_F"\n", p->tot_len));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#if SNTP_CHECK_RESPONSE >= 1
|
|
|
|
else {
|
|
|
|
/* packet from wrong remote address or port, wait for correct response */
|
|
|
|
err = ERR_TIMEOUT;
|
|
|
|
}
|
|
|
|
#endif /* SNTP_CHECK_RESPONSE >= 1 */
|
|
|
|
|
|
|
|
pbuf_free(p);
|
|
|
|
|
|
|
|
printf("Try process\r\n");
|
|
|
|
if (err == ERR_OK) {
|
|
|
|
/* correct packet received: process it it */
|
|
|
|
sntp_process(×tamps);
|
|
|
|
|
|
|
|
#if SNTP_MONITOR_SERVER_REACHABILITY
|
|
|
|
/* indicate that server responded */
|
|
|
|
sntp_servers[sntp_current_server].reachability |= 1;
|
|
|
|
#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
|
|
|
|
/* Set up timeout for next request (only if poll response was received)*/
|
|
|
|
if (sntp_opmode == SNTP_OPMODE_POLL) {
|
|
|
|
u32_t sntp_update_delay;
|
|
|
|
sys_untimeout(sntp_try_next_server, NULL);
|
|
|
|
sys_untimeout(sntp_request, NULL);
|
|
|
|
|
|
|
|
/* Correct response, reset retry timeout */
|
|
|
|
SNTP_RESET_RETRY_TIMEOUT();
|
|
|
|
|
|
|
|
sntp_update_delay = (u32_t)SNTP_UPDATE_DELAY;
|
|
|
|
sys_timeout(sntp_update_delay, sntp_request, NULL);
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_recv: Scheduled next time request: %"U32_F" ms\n",
|
|
|
|
sntp_update_delay));
|
|
|
|
}
|
|
|
|
} else if (err == SNTP_ERR_KOD) {
|
|
|
|
/* KOD errors are only processed in case of an explicit poll response */
|
|
|
|
if (sntp_opmode == SNTP_OPMODE_POLL) {
|
|
|
|
/* Kiss-of-death packet. Use another server or increase UPDATE_DELAY. */
|
|
|
|
sntp_try_next_server(NULL);
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* ignore any broken packet, poll mode: retry after timeout to avoid flooding */
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/** Actually send an sntp request to a server.
|
|
|
|
*
|
|
|
|
* @param server_addr resolved IP address of the SNTP server
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_send_request(const ip_addr_t *server_addr)
|
|
|
|
{
|
|
|
|
struct pbuf *p;
|
|
|
|
|
|
|
|
LWIP_ASSERT("server_addr != NULL", server_addr != NULL);
|
|
|
|
|
|
|
|
p = pbuf_alloc(PBUF_TRANSPORT, SNTP_MSG_LEN, PBUF_RAM);
|
|
|
|
if (p != NULL) {
|
|
|
|
struct sntp_msg *sntpmsg = (struct sntp_msg *)p->payload;
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_send_request: Sending request to server\n"));
|
|
|
|
/* initialize request message */
|
|
|
|
sntp_initialize_request(sntpmsg);
|
|
|
|
/* send request */
|
|
|
|
udp_sendto(sntp_pcb, p, server_addr, SNTP_PORT);
|
|
|
|
/* free the pbuf after sending it */
|
|
|
|
pbuf_free(p);
|
|
|
|
#if SNTP_MONITOR_SERVER_REACHABILITY
|
|
|
|
/* indicate new packet has been sent */
|
|
|
|
sntp_servers[sntp_current_server].reachability <<= 1;
|
|
|
|
#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
|
|
|
|
/* set up receive timeout: try next server or retry on timeout */
|
|
|
|
sys_timeout((u32_t)SNTP_RECV_TIMEOUT, sntp_try_next_server, NULL);
|
|
|
|
#if SNTP_CHECK_RESPONSE >= 1
|
|
|
|
/* save server address to verify it in sntp_recv */
|
|
|
|
ip_addr_copy(sntp_last_server_address, *server_addr);
|
|
|
|
#endif /* SNTP_CHECK_RESPONSE >= 1 */
|
|
|
|
} else {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_SERIOUS, ("sntp_send_request: Out of memory, trying again in %"U32_F" ms\n",
|
|
|
|
(u32_t)SNTP_RETRY_TIMEOUT));
|
|
|
|
/* out of memory: set up a timer to send a retry */
|
|
|
|
sys_timeout((u32_t)SNTP_RETRY_TIMEOUT, sntp_request, NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
/**
|
|
|
|
* DNS found callback when using DNS names as server address.
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_dns_found(const char *hostname, const ip_addr_t *ipaddr, void *arg)
|
|
|
|
{
|
|
|
|
LWIP_UNUSED_ARG(hostname);
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
|
|
|
|
if (ipaddr != NULL) {
|
|
|
|
/* Address resolved, send request */
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_dns_found: Server address resolved, sending request\n"));
|
|
|
|
sntp_servers[sntp_current_server].addr = *ipaddr;
|
|
|
|
sntp_send_request(ipaddr);
|
|
|
|
} else {
|
|
|
|
/* DNS resolving failed -> try another server */
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_WARN_STATE, ("sntp_dns_found: Failed to resolve server address resolved, trying next server\n"));
|
|
|
|
sntp_try_next_server(NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* SNTP_SERVER_DNS */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Send out an sntp request.
|
|
|
|
*
|
|
|
|
* @param arg is unused (only necessary to conform to sys_timeout)
|
|
|
|
*/
|
|
|
|
static void
|
|
|
|
sntp_request(void *arg)
|
|
|
|
{
|
|
|
|
ip_addr_t sntp_server_address;
|
|
|
|
err_t err;
|
|
|
|
|
|
|
|
LWIP_UNUSED_ARG(arg);
|
|
|
|
|
|
|
|
/* initialize SNTP server address */
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
if (sntp_servers[sntp_current_server].name) {
|
|
|
|
/* always resolve the name and rely on dns-internal caching & timeout */
|
|
|
|
ip_addr_set_zero(&sntp_servers[sntp_current_server].addr);
|
|
|
|
err = dns_gethostbyname(sntp_servers[sntp_current_server].name, &sntp_server_address,
|
|
|
|
sntp_dns_found, NULL);
|
|
|
|
if (err == ERR_INPROGRESS) {
|
|
|
|
/* DNS request sent, wait for sntp_dns_found being called */
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_STATE, ("sntp_request: Waiting for server address to be resolved.\n"));
|
|
|
|
return;
|
|
|
|
} else if (err == ERR_OK) {
|
|
|
|
sntp_servers[sntp_current_server].addr = sntp_server_address;
|
|
|
|
}
|
|
|
|
} else
|
|
|
|
#endif /* SNTP_SERVER_DNS */
|
|
|
|
{
|
|
|
|
sntp_server_address = sntp_servers[sntp_current_server].addr;
|
|
|
|
err = (ip_addr_isany_val(sntp_server_address)) ? ERR_ARG : ERR_OK;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err == ERR_OK) {
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_TRACE, ("sntp_request: current server address is %s\n",
|
|
|
|
ipaddr_ntoa(&sntp_server_address)));
|
|
|
|
sntp_send_request(&sntp_server_address);
|
|
|
|
} else {
|
|
|
|
/* address conversion failed, try another server */
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_WARN_STATE, ("sntp_request: Invalid server address, trying next server.\n"));
|
|
|
|
sys_timeout((u32_t)SNTP_RETRY_TIMEOUT, sntp_try_next_server, NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Initialize this module.
|
|
|
|
* Send out request instantly or after SNTP_STARTUP_DELAY(_FUNC).
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_init(void)
|
|
|
|
{
|
|
|
|
/* LWIP_ASSERT_CORE_LOCKED(); is checked by udp_new() */
|
|
|
|
|
|
|
|
#ifdef SNTP_SERVER_ADDRESS
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
sntp_setservername(0, SNTP_SERVER_ADDRESS);
|
|
|
|
#else
|
|
|
|
#error SNTP_SERVER_ADDRESS string not supported SNTP_SERVER_DNS==0
|
|
|
|
#endif
|
|
|
|
#endif /* SNTP_SERVER_ADDRESS */
|
|
|
|
|
|
|
|
if (sntp_pcb == NULL) {
|
|
|
|
sntp_pcb = udp_new_ip_type(IPADDR_TYPE_ANY);
|
|
|
|
printf("[SNTP] pcb isready, %p\r\n", sntp_pcb);
|
|
|
|
LWIP_ASSERT("Failed to allocate udp pcb for sntp client", sntp_pcb != NULL);
|
|
|
|
if (sntp_pcb != NULL) {
|
|
|
|
udp_recv(sntp_pcb, sntp_recv, NULL);
|
|
|
|
|
|
|
|
if (sntp_opmode == SNTP_OPMODE_POLL) {
|
|
|
|
SNTP_RESET_RETRY_TIMEOUT();
|
|
|
|
#if SNTP_STARTUP_DELAY
|
|
|
|
sys_timeout((u32_t)SNTP_STARTUP_DELAY_FUNC, sntp_request, NULL);
|
|
|
|
#else
|
|
|
|
sntp_request(NULL);
|
|
|
|
#endif
|
|
|
|
} else if (sntp_opmode == SNTP_OPMODE_LISTENONLY) {
|
|
|
|
ip_set_option(sntp_pcb, SOF_BROADCAST);
|
|
|
|
udp_bind(sntp_pcb, IP_ANY_TYPE, SNTP_PORT);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Stop this module.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_stop(void)
|
|
|
|
{
|
|
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
|
|
if (sntp_pcb != NULL) {
|
|
|
|
#if SNTP_MONITOR_SERVER_REACHABILITY
|
|
|
|
u8_t i;
|
|
|
|
for (i = 0; i < SNTP_MAX_SERVERS; i++) {
|
|
|
|
sntp_servers[i].reachability = 0;
|
|
|
|
}
|
|
|
|
#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
|
|
|
|
sys_untimeout(sntp_request, NULL);
|
|
|
|
sys_untimeout(sntp_try_next_server, NULL);
|
|
|
|
udp_remove(sntp_pcb);
|
|
|
|
sntp_pcb = NULL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Get enabled state.
|
|
|
|
*/
|
|
|
|
u8_t sntp_enabled(void)
|
|
|
|
{
|
|
|
|
return (sntp_pcb != NULL) ? 1 : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Sets the operating mode.
|
|
|
|
* @param operating_mode one of the available operating modes
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_setoperatingmode(u8_t operating_mode)
|
|
|
|
{
|
|
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
|
|
LWIP_ASSERT("Invalid operating mode", operating_mode <= SNTP_OPMODE_LISTENONLY);
|
|
|
|
LWIP_ASSERT("Operating mode must not be set while SNTP client is running", sntp_pcb == NULL);
|
|
|
|
sntp_opmode = operating_mode;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Gets the operating mode.
|
|
|
|
*/
|
|
|
|
u8_t
|
|
|
|
sntp_getoperatingmode(void)
|
|
|
|
{
|
|
|
|
return sntp_opmode;
|
|
|
|
}
|
|
|
|
|
|
|
|
#if SNTP_MONITOR_SERVER_REACHABILITY
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Gets the server reachability shift register as described in RFC 5905.
|
|
|
|
*
|
|
|
|
* @param idx the index of the NTP server
|
|
|
|
*/
|
|
|
|
u8_t
|
|
|
|
sntp_getreachability(u8_t idx)
|
|
|
|
{
|
|
|
|
if (idx < SNTP_MAX_SERVERS) {
|
|
|
|
return sntp_servers[idx].reachability;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif /* SNTP_MONITOR_SERVER_REACHABILITY */
|
|
|
|
|
|
|
|
#if SNTP_GET_SERVERS_FROM_DHCP
|
|
|
|
/**
|
|
|
|
* Config SNTP server handling by IP address, name, or DHCP; clear table
|
|
|
|
* @param set_servers_from_dhcp enable or disable getting server addresses from dhcp
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_servermode_dhcp(int set_servers_from_dhcp)
|
|
|
|
{
|
|
|
|
u8_t new_mode = set_servers_from_dhcp ? 1 : 0;
|
|
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
|
|
if (sntp_set_servers_from_dhcp != new_mode) {
|
|
|
|
sntp_set_servers_from_dhcp = new_mode;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* SNTP_GET_SERVERS_FROM_DHCP */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Initialize one of the NTP servers by IP address
|
|
|
|
*
|
|
|
|
* @param idx the index of the NTP server to set must be < SNTP_MAX_SERVERS
|
|
|
|
* @param server IP address of the NTP server to set
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_setserver(u8_t idx, const ip_addr_t *server)
|
|
|
|
{
|
|
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
|
|
if (idx < SNTP_MAX_SERVERS) {
|
|
|
|
if (server != NULL) {
|
|
|
|
sntp_servers[idx].addr = (*server);
|
|
|
|
} else {
|
|
|
|
ip_addr_set_zero(&sntp_servers[idx].addr);
|
|
|
|
}
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
sntp_servers[idx].name = NULL;
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#if LWIP_DHCP && SNTP_GET_SERVERS_FROM_DHCP
|
|
|
|
/**
|
|
|
|
* Initialize one of the NTP servers by IP address, required by DHCP
|
|
|
|
*
|
|
|
|
* @param num the index of the NTP server to set must be < SNTP_MAX_SERVERS
|
|
|
|
* @param server IP address of the NTP server to set
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
dhcp_set_ntp_servers(u8_t num, const ip4_addr_t *server)
|
|
|
|
{
|
|
|
|
LWIP_DEBUGF(SNTP_DEBUG_TRACE, ("sntp: %s %u.%u.%u.%u as NTP server #%u via DHCP\n",
|
|
|
|
(sntp_set_servers_from_dhcp ? "Got" : "Rejected"),
|
|
|
|
ip4_addr1(server), ip4_addr2(server), ip4_addr3(server), ip4_addr4(server), num));
|
|
|
|
if (sntp_set_servers_from_dhcp && num) {
|
|
|
|
u8_t i;
|
|
|
|
for (i = 0; (i < num) && (i < SNTP_MAX_SERVERS); i++) {
|
|
|
|
ip_addr_t addr;
|
|
|
|
ip_addr_copy_from_ip4(addr, server[i]);
|
|
|
|
sntp_setserver(i, &addr);
|
|
|
|
}
|
|
|
|
for (i = num; i < SNTP_MAX_SERVERS; i++) {
|
|
|
|
sntp_setserver(i, NULL);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif /* LWIP_DHCP && SNTP_GET_SERVERS_FROM_DHCP */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* @ingroup sntp
|
|
|
|
* Obtain one of the currently configured by IP address (or DHCP) NTP servers
|
|
|
|
*
|
|
|
|
* @param idx the index of the NTP server
|
|
|
|
* @return IP address of the indexed NTP server or "ip_addr_any" if the NTP
|
|
|
|
* server has not been configured by address (or at all).
|
|
|
|
*/
|
|
|
|
const ip_addr_t *
|
|
|
|
sntp_getserver(u8_t idx)
|
|
|
|
{
|
|
|
|
if (idx < SNTP_MAX_SERVERS) {
|
|
|
|
return &sntp_servers[idx].addr;
|
|
|
|
}
|
|
|
|
return IP_ADDR_ANY;
|
|
|
|
}
|
|
|
|
|
|
|
|
int sntp_get_time(uint32_t *seconds, uint32_t *frags)
|
|
|
|
{
|
|
|
|
uint32_t seconds_now, frags_now;
|
|
|
|
int ms_diff;
|
|
|
|
|
|
|
|
taskENTER_CRITICAL();
|
|
|
|
|
|
|
|
if (0 == ntp_sec) {
|
|
|
|
*seconds = 0;
|
|
|
|
*frags = 0;
|
|
|
|
} else {
|
|
|
|
ms_diff = ((int32_t)xTaskGetTickCount()) - ((int32_t)time_obtained);
|
|
|
|
|
|
|
|
seconds_now = ntp_sec;
|
|
|
|
frags_now = ntp_frag / 1000;
|
|
|
|
|
|
|
|
seconds_now += (ms_diff / 1000);
|
|
|
|
frags_now += (ms_diff % 1000);
|
|
|
|
|
|
|
|
*seconds = seconds_now;
|
|
|
|
*frags = frags_now;
|
|
|
|
}
|
|
|
|
|
|
|
|
taskEXIT_CRITICAL();
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
#if SNTP_SERVER_DNS
|
|
|
|
/**
|
|
|
|
* Initialize one of the NTP servers by name
|
|
|
|
*
|
|
|
|
* @param idx the index of the NTP server to set must be < SNTP_MAX_SERVERS
|
|
|
|
* @param server DNS name of the NTP server to set, to be resolved at contact time
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
sntp_setservername(u8_t idx, const char *server)
|
|
|
|
{
|
|
|
|
LWIP_ASSERT_CORE_LOCKED();
|
|
|
|
if (idx < SNTP_MAX_SERVERS) {
|
|
|
|
sntp_servers[idx].name = server;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Obtain one of the currently configured by name NTP servers.
|
|
|
|
*
|
|
|
|
* @param idx the index of the NTP server
|
|
|
|
* @return IP address of the indexed NTP server or NULL if the NTP
|
|
|
|
* server has not been configured by name (or at all)
|
|
|
|
*/
|
|
|
|
const char *
|
|
|
|
sntp_getservername(u8_t idx)
|
|
|
|
{
|
|
|
|
if (idx < SNTP_MAX_SERVERS) {
|
|
|
|
return sntp_servers[idx].name;
|
|
|
|
}
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif /* SNTP_SERVER_DNS */
|
|
|
|
|
|
|
|
#endif /* LWIP_UDP */
|