├── README.md
├── .gitignore
├── NTPClient.h
├── LICENSE
└── NTPClient.cpp


/README.md:
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1 | NetworkTimeProtocol
2 | ===================
3 | 
4 | A C++ Library to use the Network Time Protocol
5 | 


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/.gitignore:
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 1 | # Compiled Object files
 2 | *.slo
 3 | *.lo
 4 | *.o
 5 | 
 6 | # Compiled Dynamic libraries
 7 | *.so
 8 | *.dylib
 9 | 
10 | # Compiled Static libraries
11 | *.lai
12 | *.la
13 | *.a
14 | 


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/NTPClient.h:
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 1 | #ifndef NTPClIENT_H
 2 | #define NTPCLIENT_H
 3 | 
 4 | #include <string>
 5 | #include <iostream>
 6 | 
 7 | //Components of the Boost Library
 8 | #include <boost/array.hpp>
 9 | #include <boost/asio.hpp>
10 | 
11 | using namespace std;
12 | 
13 | namespace MultipleKinectsPlatformServer{
14 | 	
15 | 	/**
16 | 	*  A Network Time Protocol Client that queries the DateTime from the Time Server located at hostname
17 | 	*/
18 | 	class NTPClient{
19 | 		private:
20 | 			string _host_name;
21 | 			unsigned short _port;
22 | 		public:
23 | 			NTPClient(string i_hostname);
24 | 			long RequestDatetime_UNIX();
25 | 	};
26 | 
27 | }
28 | 
29 | #endif


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/LICENSE:
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 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2014 Ethan Lim
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy of
 6 | this software and associated documentation files (the "Software"), to deal in
 7 | the Software without restriction, including without limitation the rights to
 8 | use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 9 | the Software, and to permit persons to whom the Software is furnished to do so,
10 | subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
17 | FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
18 | COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
21 | 


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/NTPClient.cpp:
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 1 | #include "NTPClient.h"
 2 | 
 3 | namespace MultipleKinectsPlatformServer{
 4 | 	
 5 | 	/**
 6 | 	 *  NTPClient
 7 | 	 *  @Param i_hostname - The time server host name which you are connecting to obtain the time
 8 | 	 *						eg. the pool.ntp.org project virtual cluster of timeservers
 9 | 	 */
10 | 	NTPClient::NTPClient(string i_hostname)
11 | 		:_host_name(i_hostname),_port(123)
12 | 	{
13 | 		//Host name is defined by you and port number is 123 for time protocol
14 | 	}
15 | 
16 | 	/**
17 | 	 * RequestDatetime_UNIX()
18 | 	 * @Returns long - number of seconds from the Unix Epoch start time
19 | 	 */
20 | 	long NTPClient::RequestDatetime_UNIX(){
21 | 
22 | 		time_t timeRecv;
23 | 
24 | 		boost::asio::io_service io_service;
25 | 
26 | 		boost::asio::ip::udp::resolver resolver(io_service);
27 | 		boost::asio::ip::udp::resolver::query query(
28 | 													 boost::asio::ip::udp::v4(),
29 | 													 this->_host_name,
30 | 													 "ntp");
31 | 
32 | 		boost::asio::ip::udp::endpoint receiver_endpoint = *resolver.resolve(query);
33 | 
34 | 		boost::asio::ip::udp::socket socket(io_service);
35 | 		socket.open(boost::asio::ip::udp::v4());
36 | 		
37 | 		boost::array<unsigned char, 48> sendBuf  = {010,0,0,0,0,0,0,0,0};
38 |     
39 | 		socket.send_to(boost::asio::buffer(sendBuf), receiver_endpoint);
40 | 
41 | 		boost::array<unsigned long, 1024> recvBuf;
42 | 		boost::asio::ip::udp::endpoint sender_endpoint;
43 | 		
44 | 		try{
45 | 			size_t len = socket.receive_from(
46 | 												boost::asio::buffer(recvBuf), 
47 | 												sender_endpoint
48 | 											);
49 | 
50 | 			timeRecv = ntohl((time_t)recvBuf[4]);
51 | 
52 | 			timeRecv-= 2208988800U;  //Unix time starts from 01/01/1970 == 2208988800U
53 | 
54 | 		}catch (std::exception& e){
55 | 
56 | 			std::cerr << e.what() << std::endl;
57 | 
58 | 		}
59 | 
60 | 		return (long)timeRecv;
61 | 	}
62 | 
63 | }


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