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- /*
- * Copyright (c) 2021 Huawei Device Co., Ltd.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include "iot_sntp.h"
- #include <stdint.h>
- #include <stddef.h>
- #include <string.h>
- #include <stdlib.h>
- #include <time.h>
- #include <stdio.h>
- #include <unistd.h>
- #include "ohos_init.h"
- #include "ohos_types.h"
- #include "cmsis_os2.h"
- #include "lwip/sockets.h"
- #include "kv_store.h"
- // this is the default SNTP server and port defines, you could define your own by add it in the config.gni
- #ifndef NTP_SERVER_IP
- #define NTP_SERVER_IP "120.24.166.46"
- #endif
- #ifndef NTP_SERVER_PORT
- #define NTP_SERVER_PORT 123
- #endif
- /**
- * The ntp server returns the time from 1900-1-1-0-0-0, and the unix
- * timestamp compute from 1970-1-1-0-0-0, so we define the seconds between
- * 1900-1-1-0-0-0 and 1970-1-1-0-0-0; when we get timestamp from NTP server,
- * we must sub this time
- */
- #define SECONDS_FROM_1900_TO_1970 (2208988800L)
- /**
- * @brief NTP procto packet message
- * 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | LI| VN |Mode | Stratum | Poll | Precision |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | Root delay (32Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | Root dispersion (32Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | Reference identifier (32Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | |
- * | Reference timestamp (64Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | |
- * | Originate timestamp (64Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | |
- * | Receive timestamp (64Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | |
- * | Transmit timestamp (64Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- * | |
- * | Authenticator(optional 96Bits) |
- * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
- *
- * 主要字段的解释如下:
- * LI:当前时间闰秒标志。字段长度为2位整数,只在服务器端有效。取值定义为:
- * LI=0:无警告;
- * LI=1:最后一分钟是61秒;
- * LI=2:最后一分钟是59秒;
- * LI=3:警告(时钟没有同步)
- * 服务器在开始时,LI设置为3,一旦与主钟取得同步后就设置成其它值。
- * VN(Version Number):长度为3比特,表示NTP的版本号,可以是3或者是4
- * Mode:指示协议模式。字段长度为3位,取值定义为:
- * Mode=0:保留
- * Mode=1:对称主动;
- * Mode=2:对称被动;
- * Mode=3:客户;
- * Mode=4:服务器;
- * Mode=5:广播;
- * Mode=6:保留为NTP控制信息;
- * Mode=7:保留为用户定义;
- * 在单播和多播模式,客户在请求时把这个字段设置为3,服务器在响应时把这个字段设置为4。在广播模式下,服务器把这个字段设置为5。
- * Poll Interval:指示数据包的最大时间间隔,以秒为单位,作为2的指数方的指数部分,该字段只在服务器端有效。字段长度为8位整数,取值范围从4-17,即16秒到131,072秒。
- * Precision:指示系统时钟的精确性,以秒为单位,作为2的指数方的指数部分,该字段只在服务器端有效。字段长度为8位符号整数,取值范围从-6到-20。
- * Root Delay:指示与主时钟参考源的总共往返延迟,以秒为单位,该字段只在服务器端有效。字段长度为32位浮点数,小数部分在16位以后,取值范围从负几毫秒到正几百毫秒。
- * Root Dispersion:指示与主时钟参考源的误差,以秒为单位,该字段只在服务器端有效。字段长度为32位浮点数,小数部分在16位以后,取值范围从零毫秒到正几百毫秒。
- * Reference Identifier:指示时钟参考源的标记,该字段只在服务器端有效。对于一级服务器,字段长度为4字节ASCII字符串,左对齐不足添零。对于二级服务器,在IPV4环境下,取值为一级服务器的IP地址,在IPV6环境下,是一级服务器的NSAP地址。
- * Reference Timestamp:指示系统时钟最后一次校准的时间,该字段只在服务器端有效,以前面所述64位时间戳格式表示。
- * Originate Timestamp:指示客户向服务器发起请求的时间,以前面所述64位时间戳格式表示。
- * Receive Timestamp:指服务器收到客户请求的时间 ,以前面所述64位时间戳格式表示。
- * Transmit Timestamp:指示服务器向客户发时间戳的时间,以前面所述64位时间戳格式表示。
- * Authenticator(可选):当需要进行SNTP认证时,该字段包含密钥和信息加密码
- *
- */
- /**
- * @brief defines the NTP packet corresponding to the procto
- *
- */
- #pragma pack(1)
- typedef struct {
- uint32_t low;
- uint32_t high;
- }TimeStamp; // for the 64Bits timestamp use
- typedef struct {
- uint8_t liVnMode;
- uint8_t stratum;
- uint8_t poll;
- uint8_t precision;
- uint32_t rootDelay;
- uint32_t rootDispersion;
- uint8_t referenceID[4];
- TimeStamp refecenceTimestamp;
- TimeStamp originateTimestamp;
- TimeStamp receiveTimestamp;
- TimeStamp transmitTimestamp;
- }SntpPacket;
- #pragma pack()
- #define CN_TIMEZONE_MAXIMUM (11)
- #define CN_TIMEZONE_MINIMUM (-11)
- #define CN_SNTP_RETRYTIMES 10
- int SntpGetRtcTime(int localTimeZone, struct tm *rtcTime)
- {
- int ret = -1;
- int sockfd = -1;
- struct sockaddr_in server;
- socklen_t addrLen;
- fd_set set;
- struct timeval timeout;
- struct timeval tv;
- int nRet;
- SntpPacket sntpPacket;
- struct tm *time = NULL;
- int tryTimes = CN_SNTP_RETRYTIMES;
- // check the params passed to this API
- if ((localTimeZone > CN_TIMEZONE_MAXIMUM) || (localTimeZone < CN_TIMEZONE_MINIMUM) ||\
- rtcTime == NULL) {
- return ret;
- }
- // prepare the server address
- bzero(&server, sizeof(server));
- server.sin_family = AF_INET;
- server.sin_port = htons(NTP_SERVER_PORT);
- addrLen = sizeof(server);
- if (inet_aton(NTP_SERVER_IP, &server.sin_addr) <= 0) {
- printf("inet_pton error\n");
- return ret;
- }
- if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
- return ret;
- }
- // we do the loop here to get the time
- do{
- tryTimes--;
- // prepare the send packet
- bzero((char * )&sntpPacket, sizeof(sntpPacket)); // clean it
- sntpPacket.liVnMode = 0x1b; // set the mode to client
- if (sendto(sockfd, (char *) &sntpPacket, sizeof(sntpPacket), 0,
- (struct sockaddr*) &server, addrLen) < 0) {
- printf("sendto error!\n");
- continue;
- }
- // use select to get the data
- FD_ZERO(&set);
- FD_SET(sockfd, &set);
- timeout.tv_sec = 0;
- timeout.tv_usec = 500000;
- nRet = select(sockfd + 1, &set, NULL, NULL, &timeout);
- if (nRet < 0) {
- printf("select error!\n");
- continue;
- } else if (nRet == 0) {
- printf("time out!\n");
- continue;
- } else {
- if (FD_ISSET(sockfd, &set)) {
- if (recvfrom(sockfd, (char *) &sntpPacket, sizeof(sntpPacket),
- 0, (struct sockaddr*) &server, &addrLen) < 0) {
- printf("recv error!\n");
- continue;
- } else {
- tv.tv_usec = 0;
- tv.tv_sec = ntohl(sntpPacket.transmitTimestamp.low);
- tv.tv_sec -= SECONDS_FROM_1900_TO_1970;
- tv.tv_sec += (localTimeZone * 3600);
- if((time = gmtime_r((const long int *) &tv.tv_sec, rtcTime)) != NULL) {
- ret = 0;
- break;
- }
- }
- }
- }
- } while (tryTimes > 0);
- closesocket(sockfd);
- return ret;
- }
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