/* * 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 #include #include #include #include #include #include #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; }