ST / NTPClient

NTP client to get UTC time from the internet time servers

Dependents:   NTPClient_HelloWorld

Fork of NTPClient by ST Expansion SW Team

NTPClient.cpp@7:2ac816b0f4ab, 2017-01-03 (annotated)

Committer:
mapellil
Date:
Tue Jan 03 13:28:59 2017 +0000
Revision:
7:2ac816b0f4ab
Parent:
6:510bffa8b3d9 
fixed warning

Who changed what in which revision?

UserRevisionLine numberNew contents of line
donatien 0:04a82df0f587 1 /* NTPClient.cpp */
donatien 2:9a64a50df235 2 /* Copyright (C) 2012 mbed.org, MIT License
donatien 2:9a64a50df235 3 *
donatien 2:9a64a50df235 4 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
donatien 2:9a64a50df235 5 * and associated documentation files (the "Software"), to deal in the Software without restriction,
donatien 2:9a64a50df235 6 * including without limitation the rights to use, copy, modify, merge, publish, distribute,
donatien 2:9a64a50df235 7 * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
donatien 2:9a64a50df235 8 * furnished to do so, subject to the following conditions:
donatien 2:9a64a50df235 9 *
donatien 2:9a64a50df235 10 * The above copyright notice and this permission notice shall be included in all copies or
donatien 2:9a64a50df235 11 * substantial portions of the Software.
donatien 2:9a64a50df235 12 *
donatien 2:9a64a50df235 13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
donatien 2:9a64a50df235 14 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
donatien 2:9a64a50df235 15 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
donatien 2:9a64a50df235 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
donatien 2:9a64a50df235 17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
donatien 2:9a64a50df235 18 */
donatien 0:04a82df0f587 19
donatien 2:9a64a50df235 20 //Debug is disabled by default
donatien 4:881559865a93 21 #if 0
donatien 2:9a64a50df235 22 //Enable debug
donatien 2:9a64a50df235 23 #define __DEBUG__
donatien 2:9a64a50df235 24 #include <cstdio>
donatien 2:9a64a50df235 25 #define DBG(x, ...) std::printf("[NTPClient : DBG]"x"\r\n", ##__VA_ARGS__);
donatien 2:9a64a50df235 26 #define WARN(x, ...) std::printf("[NTPClient : WARN]"x"\r\n", ##__VA_ARGS__);
donatien 2:9a64a50df235 27 #define ERR(x, ...) std::printf("[NTPClient : ERR]"x"\r\n", ##__VA_ARGS__);
donatien 0:04a82df0f587 28
donatien 2:9a64a50df235 29 #else
donatien 2:9a64a50df235 30 //Disable debug
donatien 2:9a64a50df235 31 #define DBG(x, ...)
donatien 2:9a64a50df235 32 #define WARN(x, ...)
donatien 2:9a64a50df235 33 #define ERR(x, ...)
donatien 2:9a64a50df235 34
donatien 0:04a82df0f587 35 #endif
mapellil 5:fe36718063a5 36 #include "NetworkStack.h"
donatien 0:04a82df0f587 37 #include "NTPClient.h"
donatien 0:04a82df0f587 38
donatien 1:b221a8765b3f 39 #include "UDPSocket.h"
donatien 1:b221a8765b3f 40
donatien 0:04a82df0f587 41 #include "mbed.h" //time() and set_time()
donatien 0:04a82df0f587 42
donatien 0:04a82df0f587 43 #define NTP_PORT 123
donatien 0:04a82df0f587 44 #define NTP_CLIENT_PORT 0 //Random port
donatien 0:04a82df0f587 45 #define NTP_TIMESTAMP_DELTA 2208988800ull //Diff btw a UNIX timestamp (Starting Jan, 1st 1970) and a NTP timestamp (Starting Jan, 1st 1900)
donatien 0:04a82df0f587 46
mapellil 5:fe36718063a5 47 /*NTPClient::NTPClient() : m_sock()
donatien 0:04a82df0f587 48 {
donatien 0:04a82df0f587 49
mapellil 5:fe36718063a5 50 }*/
donatien 0:04a82df0f587 51
mapellil 5:fe36718063a5 52 NTPClient::NTPClient(NetworkStack & _m_intf) : m_intf(_m_intf)
mapellil 5:fe36718063a5 53 {
donatien 0:04a82df0f587 54 }
donatien 0:04a82df0f587 55
mapellil 5:fe36718063a5 56 #ifdef htons
mapellil 5:fe36718063a5 57 #undef htons
mapellil 5:fe36718063a5 58 #endif /* htons */
mapellil 5:fe36718063a5 59 #ifdef htonl
mapellil 5:fe36718063a5 60 #undef htonl
mapellil 5:fe36718063a5 61 #endif /* htonl */
mapellil 5:fe36718063a5 62 #ifdef ntohs
mapellil 5:fe36718063a5 63 #undef ntohs
mapellil 5:fe36718063a5 64 #endif /* ntohs */
mapellil 5:fe36718063a5 65 #ifdef ntohl
mapellil 5:fe36718063a5 66 #undef ntohl
mapellil 5:fe36718063a5 67 #endif /* ntohl */
mapellil 5:fe36718063a5 68
mapellil 5:fe36718063a5 69
mapellil 5:fe36718063a5 70 #if ((__BYTE_ORDER__) == (__ORDER_LITTLE_ENDIAN__))
mapellil 5:fe36718063a5 71
mapellil 5:fe36718063a5 72 #define htons(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
mapellil 5:fe36718063a5 73 #define ntohs(x) htons(x)
mapellil 5:fe36718063a5 74 #define htonl(x) ((((x) & 0xff) << 24) | \
mapellil 5:fe36718063a5 75 (((x) & 0xff00) << 8) | \
mapellil 5:fe36718063a5 76 (((x) & 0xff0000UL) >> 8) | \
mapellil 5:fe36718063a5 77 (((x) & 0xff000000UL) >> 24))
mapellil 5:fe36718063a5 78 #define ntohl(x) htonl(x)
mapellil 5:fe36718063a5 79
mapellil 5:fe36718063a5 80 #else
mapellil 5:fe36718063a5 81
mapellil 5:fe36718063a5 82 #define htons(x) (x)
mapellil 5:fe36718063a5 83 #define htonl(x) (x)
mapellil 5:fe36718063a5 84 #define ntohl(x) (x)
mapellil 5:fe36718063a5 85 #define ntohs(x) (x)
mapellil 5:fe36718063a5 86
mapellil 5:fe36718063a5 87 #endif
mapellil 5:fe36718063a5 88
mapellil 5:fe36718063a5 89
donatien 2:9a64a50df235 90 NTPResult NTPClient::setTime(const char* host, uint16_t port, uint32_t timeout)
donatien 0:04a82df0f587 91 {
donatien 2:9a64a50df235 92 #ifdef __DEBUG__
donatien 0:04a82df0f587 93 time_t ctTime;
donatien 0:04a82df0f587 94 ctTime = time(NULL);
mapellil 5:fe36718063a5 95 set_time(ctTime);
donatien 2:9a64a50df235 96 DBG("Time is set to (UTC): %s", ctime(&ctTime));
donatien 0:04a82df0f587 97 #endif
donatien 0:04a82df0f587 98
mapellil 5:fe36718063a5 99 SocketAddress address(0, port);
mapellil 5:fe36718063a5 100 int r = m_intf.gethostbyname(&address, host);
mapellil 5:fe36718063a5 101 if (r) {
mapellil 5:fe36718063a5 102 printf("error: 'gethostbyname(\"%s\")' failed with code %d\r\n", host, r);
mapellil 5:fe36718063a5 103 } else if (!address) {
mapellil 5:fe36718063a5 104 printf("error: 'gethostbyname(\"%s\")' returned null IP address\r\n", host);
mapellil 5:fe36718063a5 105 }
mapellil 5:fe36718063a5 106 //printf ("address: %s\n\r",address.get_ip_address());
mapellil 5:fe36718063a5 107
donatien 1:b221a8765b3f 108 //Create & bind socket
mapellil 5:fe36718063a5 109 if (m_sock.open(&m_intf) < 0) printf ("ERROR sock open \n\r");
mapellil 6:510bffa8b3d9 110 m_sock.set_timeout(timeout);
donatien 0:04a82df0f587 111
mapellil 5:fe36718063a5 112 struct NTPPacket pkt;
mapellil 5:fe36718063a5 113 memset (&pkt, 0, sizeof(NTPPacket));
donatien 0:04a82df0f587 114
donatien 0:04a82df0f587 115 //Now ping the server and wait for response
donatien 0:04a82df0f587 116 DBG("Ping");
donatien 0:04a82df0f587 117 //Prepare NTP Packet:
donatien 0:04a82df0f587 118 pkt.li = 0; //Leap Indicator : No warning
donatien 0:04a82df0f587 119 pkt.vn = 4; //Version Number : 4
donatien 0:04a82df0f587 120 pkt.mode = 3; //Client mode
donatien 0:04a82df0f587 121 pkt.stratum = 0; //Not relevant here
donatien 0:04a82df0f587 122 pkt.poll = 0; //Not significant as well
donatien 0:04a82df0f587 123 pkt.precision = 0; //Neither this one is
donatien 0:04a82df0f587 124
mapellil 5:fe36718063a5 125 int ret = m_sock.sendto(address, (char*)&pkt, sizeof(NTPPacket) );
donatien 2:9a64a50df235 126 if (ret < 0 )
donatien 0:04a82df0f587 127 {
mapellil 5:fe36718063a5 128 ERR("Could not send packet %d", ret);
donatien 2:9a64a50df235 129 m_sock.close();
donatien 2:9a64a50df235 130 return NTP_CONN;
donatien 0:04a82df0f587 131 }
donatien 0:04a82df0f587 132
donatien 0:04a82df0f587 133 //Read response
mapellil 5:fe36718063a5 134 DBG("Pong");
donatien 2:9a64a50df235 135
mapellil 5:fe36718063a5 136 ret = m_sock.recvfrom(&address, (char*)&pkt, sizeof(NTPPacket) ); // LICIO
mapellil 5:fe36718063a5 137 if(ret < 0)
donatien 0:04a82df0f587 138 {
mapellil 5:fe36718063a5 139 ERR("Could not receive packet %d", ret);
mapellil 5:fe36718063a5 140 m_sock.close();
mapellil 5:fe36718063a5 141 return NTP_CONN;
mapellil 5:fe36718063a5 142 }
donatien 0:04a82df0f587 143
donatien 0:04a82df0f587 144 if(ret < sizeof(NTPPacket)) //TODO: Accept chunks
donatien 0:04a82df0f587 145 {
donatien 0:04a82df0f587 146 ERR("Receive packet size does not match");
donatien 2:9a64a50df235 147 m_sock.close();
donatien 2:9a64a50df235 148 return NTP_PRTCL;
donatien 0:04a82df0f587 149 }
donatien 0:04a82df0f587 150
donatien 0:04a82df0f587 151 if( pkt.stratum == 0) //Kiss of death message : Not good !
donatien 0:04a82df0f587 152 {
donatien 0:04a82df0f587 153 ERR("Kissed to death!");
donatien 2:9a64a50df235 154 m_sock.close();
donatien 2:9a64a50df235 155 return NTP_PRTCL;
donatien 0:04a82df0f587 156 }
donatien 0:04a82df0f587 157
donatien 0:04a82df0f587 158 //Correct Endianness
mapellil 5:fe36718063a5 159 pkt.refTm_s = ntohl( pkt.refTm_s );
donatien 0:04a82df0f587 160 pkt.refTm_f = ntohl( pkt.refTm_f );
donatien 0:04a82df0f587 161 pkt.origTm_s = ntohl( pkt.origTm_s );
donatien 0:04a82df0f587 162 pkt.origTm_f = ntohl( pkt.origTm_f );
donatien 0:04a82df0f587 163 pkt.rxTm_s = ntohl( pkt.rxTm_s );
donatien 0:04a82df0f587 164 pkt.rxTm_f = ntohl( pkt.rxTm_f );
donatien 0:04a82df0f587 165 pkt.txTm_s = ntohl( pkt.txTm_s );
donatien 0:04a82df0f587 166 pkt.txTm_f = ntohl( pkt.txTm_f );
donatien 0:04a82df0f587 167
mapellil 5:fe36718063a5 168 // see RFC 4330 p.13
mapellil 5:fe36718063a5 169 time_t txTm = (time_t)(pkt.txTm_s - NTP_TIMESTAMP_DELTA);
mapellil 5:fe36718063a5 170 set_time(txTm);
donatien 0:04a82df0f587 171
donatien 2:9a64a50df235 172 #ifdef __DEBUG__
donatien 0:04a82df0f587 173 ctTime = time(NULL);
donatien 2:9a64a50df235 174 DBG("Time is now (UTC): %s", ctime(&ctTime));
donatien 0:04a82df0f587 175 #endif
donatien 2:9a64a50df235 176 m_sock.close();
donatien 0:04a82df0f587 177
donatien 2:9a64a50df235 178 return NTP_OK;
donatien 0:04a82df0f587 179 }
donatien 0:04a82df0f587 180