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services/ntp/NTPClient.cpp@0:ac21159e27f4, 2010-07-02 (annotated)

Committer:: darran
Date:: Fri Jul 02 17:21:58 2010 +0000
Revision:: 0:ac21159e27f4

Who changed what in which revision?

User	Revision	Line number	New contents of line
darran	0:ac21159e27f4	1
darran	0:ac21159e27f4	2	/*
darran	0:ac21159e27f4	3	Copyright (c) 2010 Donatien Garnier (donatiengar [at] gmail [dot] com)
darran	0:ac21159e27f4	4
darran	0:ac21159e27f4	5	Permission is hereby granted, free of charge, to any person obtaining a copy
darran	0:ac21159e27f4	6	of this software and associated documentation files (the "Software"), to deal
darran	0:ac21159e27f4	7	in the Software without restriction, including without limitation the rights
darran	0:ac21159e27f4	8	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
darran	0:ac21159e27f4	9	copies of the Software, and to permit persons to whom the Software is
darran	0:ac21159e27f4	10	furnished to do so, subject to the following conditions:
darran	0:ac21159e27f4	11
darran	0:ac21159e27f4	12	The above copyright notice and this permission notice shall be included in
darran	0:ac21159e27f4	13	all copies or substantial portions of the Software.
darran	0:ac21159e27f4	14
darran	0:ac21159e27f4	15	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
darran	0:ac21159e27f4	16	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
darran	0:ac21159e27f4	17	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
darran	0:ac21159e27f4	18	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
darran	0:ac21159e27f4	19	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
darran	0:ac21159e27f4	20	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
darran	0:ac21159e27f4	21	THE SOFTWARE.
darran	0:ac21159e27f4	22	*/
darran	0:ac21159e27f4	23
darran	0:ac21159e27f4	24	#include "NTPClient.h"
darran	0:ac21159e27f4	25
darran	0:ac21159e27f4	26	#include <stdio.h>
darran	0:ac21159e27f4	27
darran	0:ac21159e27f4	28	//#define __DEBUG
darran	0:ac21159e27f4	29	#include "dbg/dbg.h"
darran	0:ac21159e27f4	30
darran	0:ac21159e27f4	31	#define NTP_PORT 123
darran	0:ac21159e27f4	32	#define NTP_CLIENT_PORT 0//50420 //Random port
darran	0:ac21159e27f4	33	#define NTP_REQUEST_TIMEOUT 15000
darran	0:ac21159e27f4	34	#define NTP_TIMESTAMP_DELTA 2208988800ull //Diff btw a UNIX timestamp (Starting Jan, 1st 1970) and a NTP timestamp (Starting Jan, 1st 1900)
darran	0:ac21159e27f4	35
darran	0:ac21159e27f4	36	#define htons( x ) ( (( x << 8 ) & 0xFF00) \| (( x >> 8 ) & 0x00FF) )
darran	0:ac21159e27f4	37	#define ntohs( x ) (htons(x))
darran	0:ac21159e27f4	38
darran	0:ac21159e27f4	39	#define htonl( x ) ( (( x << 24 ) & 0xFF000000) \
darran	0:ac21159e27f4	40	\| (( x << 8 ) & 0x00FF0000) \
darran	0:ac21159e27f4	41	\| (( x >> 8 ) & 0x0000FF00) \
darran	0:ac21159e27f4	42	\| (( x >> 24 ) & 0x000000FF) )
darran	0:ac21159e27f4	43	#define ntohl( x ) (htonl(x))
darran	0:ac21159e27f4	44
darran	0:ac21159e27f4	45	NTPClient::NTPClient() : NetService(false), m_state(NTP_PING), m_pCbItem(NULL), m_pCbMeth(NULL), m_pCb(NULL),
darran	0:ac21159e27f4	46	m_watchdog(), m_timeout(0), m_closed(true), m_host(), m_pDnsReq(NULL), m_blockingResult(NTP_PROCESSING)
darran	0:ac21159e27f4	47	{
darran	0:ac21159e27f4	48	setTimeout(NTP_REQUEST_TIMEOUT);
darran	0:ac21159e27f4	49	DBG("\r\nNew NTPClient %p\r\n",this);
darran	0:ac21159e27f4	50	}
darran	0:ac21159e27f4	51
darran	0:ac21159e27f4	52	NTPClient::~NTPClient()
darran	0:ac21159e27f4	53	{
darran	0:ac21159e27f4	54	close();
darran	0:ac21159e27f4	55	}
darran	0:ac21159e27f4	56
darran	0:ac21159e27f4	57	//High level setup functions
darran	0:ac21159e27f4	58	NTPResult NTPClient::setTime(const Host& host) //Blocking
darran	0:ac21159e27f4	59	{
darran	0:ac21159e27f4	60	doSetTime(host);
darran	0:ac21159e27f4	61	return blockingProcess();
darran	0:ac21159e27f4	62	}
darran	0:ac21159e27f4	63
darran	0:ac21159e27f4	64	NTPResult NTPClient::setTime(const Host& host, void (*pMethod)(NTPResult)) //Non blocking
darran	0:ac21159e27f4	65	{
darran	0:ac21159e27f4	66	setOnResult(pMethod);
darran	0:ac21159e27f4	67	doSetTime(host);
darran	0:ac21159e27f4	68	return NTP_PROCESSING;
darran	0:ac21159e27f4	69	}
darran	0:ac21159e27f4	70
darran	0:ac21159e27f4	71	#if 0 //For doc only
darran	0:ac21159e27f4	72	template<class T>
darran	0:ac21159e27f4	73	NTPResult NTPClient::setTime(const Host& host, T* pItem, void (T::*pMethod)(NTPResult)) //Non blocking
darran	0:ac21159e27f4	74	{
darran	0:ac21159e27f4	75	setOnResult(pItem, pMethod);
darran	0:ac21159e27f4	76	doSetTime(host);
darran	0:ac21159e27f4	77	return NTP_PROCESSING;
darran	0:ac21159e27f4	78	}
darran	0:ac21159e27f4	79	#endif
darran	0:ac21159e27f4	80
darran	0:ac21159e27f4	81	void NTPClient::doSetTime(const Host& host)
darran	0:ac21159e27f4	82	{
darran	0:ac21159e27f4	83	init();
darran	0:ac21159e27f4	84	resetTimeout();
darran	0:ac21159e27f4	85	m_host = host;
darran	0:ac21159e27f4	86	if(!m_host.getPort())
darran	0:ac21159e27f4	87	{
darran	0:ac21159e27f4	88	m_host.setPort(NTP_PORT);
darran	0:ac21159e27f4	89	}
darran	0:ac21159e27f4	90	if(m_host.getIp().isNull())
darran	0:ac21159e27f4	91	{
darran	0:ac21159e27f4	92	//DNS query required
darran	0:ac21159e27f4	93	m_pDnsReq = new DNSRequest();
darran	0:ac21159e27f4	94	DBG("\r\nNTPClient : DNSRequest %p\r\n", m_pDnsReq);
darran	0:ac21159e27f4	95	m_pDnsReq->setOnReply(this, &NTPClient::onDNSReply);
darran	0:ac21159e27f4	96	m_pDnsReq->resolve(&m_host);
darran	0:ac21159e27f4	97	return;
darran	0:ac21159e27f4	98	}
darran	0:ac21159e27f4	99	open();
darran	0:ac21159e27f4	100	}
darran	0:ac21159e27f4	101
darran	0:ac21159e27f4	102	void NTPClient::setOnResult( void (*pMethod)(NTPResult) )
darran	0:ac21159e27f4	103	{
darran	0:ac21159e27f4	104	m_pCb = pMethod;
darran	0:ac21159e27f4	105	}
darran	0:ac21159e27f4	106
darran	0:ac21159e27f4	107	void NTPClient::close()
darran	0:ac21159e27f4	108	{
darran	0:ac21159e27f4	109	if(m_closed)
darran	0:ac21159e27f4	110	return;
darran	0:ac21159e27f4	111	m_closed = true; //Prevent recursive calling or calling on an object being destructed by someone else
darran	0:ac21159e27f4	112	m_watchdog.stop();
darran	0:ac21159e27f4	113	m_pUDPSocket->resetOnEvent();
darran	0:ac21159e27f4	114	m_pUDPSocket->close();
darran	0:ac21159e27f4	115	delete m_pUDPSocket;
darran	0:ac21159e27f4	116	if( m_pDnsReq )
darran	0:ac21159e27f4	117	{
darran	0:ac21159e27f4	118	m_pDnsReq->close();
darran	0:ac21159e27f4	119	delete m_pDnsReq;
darran	0:ac21159e27f4	120	m_pDnsReq = NULL;
darran	0:ac21159e27f4	121	}
darran	0:ac21159e27f4	122	}
darran	0:ac21159e27f4	123
darran	0:ac21159e27f4	124	void NTPClient::poll() //Called by NetServices
darran	0:ac21159e27f4	125	{
darran	0:ac21159e27f4	126	if( (!m_closed) && (m_watchdog.read_ms() >= m_timeout) )
darran	0:ac21159e27f4	127	{
darran	0:ac21159e27f4	128	onTimeout();
darran	0:ac21159e27f4	129	}
darran	0:ac21159e27f4	130	}
darran	0:ac21159e27f4	131
darran	0:ac21159e27f4	132	void NTPClient::init() //Create and setup socket if needed
darran	0:ac21159e27f4	133	{
darran	0:ac21159e27f4	134	if(!m_closed) //Already opened
darran	0:ac21159e27f4	135	return;
darran	0:ac21159e27f4	136	m_state = NTP_PING;
darran	0:ac21159e27f4	137	m_pUDPSocket = new UDPSocket;
darran	0:ac21159e27f4	138	m_pUDPSocket->setOnEvent(this, &NTPClient::onUDPSocketEvent);
darran	0:ac21159e27f4	139	m_closed = false;
darran	0:ac21159e27f4	140	DBG("NTPClient: Init OK\n");
darran	0:ac21159e27f4	141	}
darran	0:ac21159e27f4	142
darran	0:ac21159e27f4	143	void NTPClient::open()
darran	0:ac21159e27f4	144	{
darran	0:ac21159e27f4	145	resetTimeout();
darran	0:ac21159e27f4	146	DBG("Opening connection\n");
darran	0:ac21159e27f4	147	m_state = NTP_PING;
darran	0:ac21159e27f4	148	Host localhost(IpAddr(127,0,0,1), NTP_CLIENT_PORT, "localhost");
darran	0:ac21159e27f4	149	m_pUDPSocket->bind(localhost);
darran	0:ac21159e27f4	150	set_time( 1280000000 ); //End of July 2010... just there to limit offset range
darran	0:ac21159e27f4	151	process();
darran	0:ac21159e27f4	152	}
darran	0:ac21159e27f4	153
darran	0:ac21159e27f4	154	#define MIN(a,b) ((a)<(b))?(a):(b)
darran	0:ac21159e27f4	155	void NTPClient::process() //Main state-machine
darran	0:ac21159e27f4	156	{
darran	0:ac21159e27f4	157	int len;
darran	0:ac21159e27f4	158	Host host;
darran	0:ac21159e27f4	159
darran	0:ac21159e27f4	160	switch(m_state)
darran	0:ac21159e27f4	161	{
darran	0:ac21159e27f4	162	case NTP_PING:
darran	0:ac21159e27f4	163	DBG("\r\nPing\r\n");
darran	0:ac21159e27f4	164	//Prepare NTP Packet:
darran	0:ac21159e27f4	165	m_pkt.li = 0; //Leap Indicator : No warning
darran	0:ac21159e27f4	166	m_pkt.vn = 4; //Version Number : 4
darran	0:ac21159e27f4	167	m_pkt.mode = 3; //Client mode
darran	0:ac21159e27f4	168	m_pkt.stratum = 0; //Not relevant here
darran	0:ac21159e27f4	169	m_pkt.poll = 0; //Not significant as well
darran	0:ac21159e27f4	170	m_pkt.precision = 0; //Neither this one is
darran	0:ac21159e27f4	171
darran	0:ac21159e27f4	172	m_pkt.rootDelay = 0; //Or this one
darran	0:ac21159e27f4	173	m_pkt.rootDispersion = 0; //Or that one
darran	0:ac21159e27f4	174	m_pkt.refId = 0; //...
darran	0:ac21159e27f4	175
darran	0:ac21159e27f4	176	m_pkt.refTm_s = 0;
darran	0:ac21159e27f4	177	m_pkt.origTm_s = 0;
darran	0:ac21159e27f4	178	m_pkt.rxTm_s = 0;
darran	0:ac21159e27f4	179	m_pkt.txTm_s = htonl( NTP_TIMESTAMP_DELTA + time(NULL) ); //WARN: We are in LE format, network byte order is BE
darran	0:ac21159e27f4	180
darran	0:ac21159e27f4	181	m_pkt.refTm_f = m_pkt.origTm_f = m_pkt.rxTm_f = m_pkt.txTm_f = 0;
darran	0:ac21159e27f4	182
darran	0:ac21159e27f4	183	//Hex Dump:
darran	0:ac21159e27f4	184	DBG("\r\nDump Tx:\r\n");
darran	0:ac21159e27f4	185	for(int i = 0; i< sizeof(NTPPacket); i++)
darran	0:ac21159e27f4	186	{
darran	0:ac21159e27f4	187	DBG("%02x ", ((char)&m_pkt + i));
darran	0:ac21159e27f4	188	}
darran	0:ac21159e27f4	189	DBG("\r\n\r\n");
darran	0:ac21159e27f4	190
darran	0:ac21159e27f4	191	len = m_pUDPSocket->sendto( (char*)&m_pkt, sizeof(NTPPacket), &m_host );
darran	0:ac21159e27f4	192	if(len < sizeof(NTPPacket))
darran	0:ac21159e27f4	193	{ onResult(NTP_PRTCL); close(); return; }
darran	0:ac21159e27f4	194
darran	0:ac21159e27f4	195	m_state = NTP_PONG;
darran	0:ac21159e27f4	196
darran	0:ac21159e27f4	197	break;
darran	0:ac21159e27f4	198
darran	0:ac21159e27f4	199	case NTP_PONG:
darran	0:ac21159e27f4	200	DBG("\r\nPong\r\n");
darran	0:ac21159e27f4	201	while( len = m_pUDPSocket->recvfrom( (char*)&m_pkt, sizeof(NTPPacket), &host ) )
darran	0:ac21159e27f4	202	{
darran	0:ac21159e27f4	203	if( len <= 0 )
darran	0:ac21159e27f4	204	break;
darran	0:ac21159e27f4	205	if( !host.getIp().isEq(m_host.getIp()) )
darran	0:ac21159e27f4	206	continue; //Not our packet
darran	0:ac21159e27f4	207	if( len > 0 )
darran	0:ac21159e27f4	208	break;
darran	0:ac21159e27f4	209	}
darran	0:ac21159e27f4	210
darran	0:ac21159e27f4	211	if(len == 0)
darran	0:ac21159e27f4	212	return; //Wait for the next packet
darran	0:ac21159e27f4	213
darran	0:ac21159e27f4	214	if(len < 0)
darran	0:ac21159e27f4	215	{ onResult(NTP_PRTCL); close(); return; }
darran	0:ac21159e27f4	216
darran	0:ac21159e27f4	217	if(len < sizeof(NTPPacket)) //TODO: Accept chunks
darran	0:ac21159e27f4	218	{ onResult(NTP_PRTCL); close(); return; }
darran	0:ac21159e27f4	219
darran	0:ac21159e27f4	220	//Hex Dump:
darran	0:ac21159e27f4	221	DBG("\r\nDump Rx:\r\n");
darran	0:ac21159e27f4	222	for(int i = 0; i< sizeof(NTPPacket); i++)
darran	0:ac21159e27f4	223	{
darran	0:ac21159e27f4	224	DBG("%02x ", ((char)&m_pkt + i));
darran	0:ac21159e27f4	225	}
darran	0:ac21159e27f4	226	DBG("\r\n\r\n");
darran	0:ac21159e27f4	227
darran	0:ac21159e27f4	228	if( m_pkt.stratum == 0) //Kiss of death message : Not good !
darran	0:ac21159e27f4	229	{
darran	0:ac21159e27f4	230	onResult(NTP_PRTCL); close(); return;
darran	0:ac21159e27f4	231	}
darran	0:ac21159e27f4	232
darran	0:ac21159e27f4	233	//Correct Endianness
darran	0:ac21159e27f4	234	m_pkt.refTm_s = ntohl( m_pkt.refTm_s );
darran	0:ac21159e27f4	235	m_pkt.refTm_f = ntohl( m_pkt.refTm_f );
darran	0:ac21159e27f4	236	m_pkt.origTm_s = ntohl( m_pkt.origTm_s );
darran	0:ac21159e27f4	237	m_pkt.origTm_f = ntohl( m_pkt.origTm_f );
darran	0:ac21159e27f4	238	m_pkt.rxTm_s = ntohl( m_pkt.rxTm_s );
darran	0:ac21159e27f4	239	m_pkt.rxTm_f = ntohl( m_pkt.rxTm_f );
darran	0:ac21159e27f4	240	m_pkt.txTm_s = ntohl( m_pkt.txTm_s );
darran	0:ac21159e27f4	241	m_pkt.txTm_f = ntohl( m_pkt.txTm_f );
darran	0:ac21159e27f4	242
darran	0:ac21159e27f4	243	//Compute offset, see RFC 4330 p.13
darran	0:ac21159e27f4	244	uint32_t destTm_s = (NTP_TIMESTAMP_DELTA + time(NULL));
darran	0:ac21159e27f4	245	//int32_t origTm = (int32_t) ((uint64_t) m_pkt.origTm - NTP_TIMESTAMP_DELTA); //Convert in local 32 bits timestamps
darran	0:ac21159e27f4	246	//int32_t rxTm = (int32_t) ((uint64_t) m_pkt.rxTm - NTP_TIMESTAMP_DELTA); //Convert in local 32 bits timestamps
darran	0:ac21159e27f4	247	//int32_t txTm = (int32_t) ((uint64_t) m_pkt.txTm - NTP_TIMESTAMP_DELTA); //Convert in local 32 bits timestamps
darran	0:ac21159e27f4	248	// int64_t offset = ( ( ( m_pkt.rxTm_s - m_pkt.origTm_s ) + ( m_pkt.txTm_s - destTm_s ) ) << 32 + ( ( m_pkt.rxTm_f - m_pkt.origTm_f ) + ( m_pkt.txTm_f - 0 ) ) ) / 2;
darran	0:ac21159e27f4	249	int64_t offset = ( (int64_t)( m_pkt.rxTm_s - m_pkt.origTm_s ) + (int64_t) ( m_pkt.txTm_s - destTm_s ) ) / 2; //Avoid overflow
darran	0:ac21159e27f4	250	DBG("\r\nSent @%d\r\n", m_pkt.txTm_s);
darran	0:ac21159e27f4	251	DBG("\r\nOffset: %d\r\n", offset);
darran	0:ac21159e27f4	252	//Set time accordingly
darran	0:ac21159e27f4	253	set_time( time(NULL) + (offset />> 32/) );
darran	0:ac21159e27f4	254
darran	0:ac21159e27f4	255	onResult(NTP_OK);
darran	0:ac21159e27f4	256	close();
darran	0:ac21159e27f4	257
darran	0:ac21159e27f4	258	break;
darran	0:ac21159e27f4	259	}
darran	0:ac21159e27f4	260	}
darran	0:ac21159e27f4	261
darran	0:ac21159e27f4	262	void NTPClient::setTimeout(int ms)
darran	0:ac21159e27f4	263	{
darran	0:ac21159e27f4	264	m_timeout = ms;
darran	0:ac21159e27f4	265	}
darran	0:ac21159e27f4	266
darran	0:ac21159e27f4	267	void NTPClient::resetTimeout()
darran	0:ac21159e27f4	268	{
darran	0:ac21159e27f4	269	m_watchdog.reset();
darran	0:ac21159e27f4	270	m_watchdog.start();
darran	0:ac21159e27f4	271	}
darran	0:ac21159e27f4	272
darran	0:ac21159e27f4	273	void NTPClient::onTimeout() //Connection has timed out
darran	0:ac21159e27f4	274	{
darran	0:ac21159e27f4	275	close();
darran	0:ac21159e27f4	276	onResult(NTP_TIMEOUT);
darran	0:ac21159e27f4	277	}
darran	0:ac21159e27f4	278
darran	0:ac21159e27f4	279	void NTPClient::onDNSReply(DNSReply r)
darran	0:ac21159e27f4	280	{
darran	0:ac21159e27f4	281	if(m_closed)
darran	0:ac21159e27f4	282	{
darran	0:ac21159e27f4	283	DBG("\r\nWARN: Discarded\r\n");
darran	0:ac21159e27f4	284	return;
darran	0:ac21159e27f4	285	}
darran	0:ac21159e27f4	286
darran	0:ac21159e27f4	287	if( r != DNS_FOUND )
darran	0:ac21159e27f4	288	{
darran	0:ac21159e27f4	289	DBG("\r\nCould not resolve hostname.\r\n");
darran	0:ac21159e27f4	290	onResult(NTP_DNS);
darran	0:ac21159e27f4	291	close();
darran	0:ac21159e27f4	292	return;
darran	0:ac21159e27f4	293	}
darran	0:ac21159e27f4	294	DBG("\r\nDNS resolved.\r\n");
darran	0:ac21159e27f4	295	m_pDnsReq->close();
darran	0:ac21159e27f4	296	delete m_pDnsReq;
darran	0:ac21159e27f4	297	m_pDnsReq=NULL;
darran	0:ac21159e27f4	298	open();
darran	0:ac21159e27f4	299	}
darran	0:ac21159e27f4	300
darran	0:ac21159e27f4	301	void NTPClient::onUDPSocketEvent(UDPSocketEvent e)
darran	0:ac21159e27f4	302	{
darran	0:ac21159e27f4	303	resetTimeout();
darran	0:ac21159e27f4	304	switch(e)
darran	0:ac21159e27f4	305	{
darran	0:ac21159e27f4	306	case UDPSOCKET_READABLE: //The only event for now
darran	0:ac21159e27f4	307	resetTimeout();
darran	0:ac21159e27f4	308	process();
darran	0:ac21159e27f4	309	break;
darran	0:ac21159e27f4	310	}
darran	0:ac21159e27f4	311	}
darran	0:ac21159e27f4	312
darran	0:ac21159e27f4	313	void NTPClient::onResult(NTPResult r) //Must be called by impl when the request completes
darran	0:ac21159e27f4	314	{
darran	0:ac21159e27f4	315	if(m_pCbItem && m_pCbMeth)
darran	0:ac21159e27f4	316	(m_pCbItem->*m_pCbMeth)(r);
darran	0:ac21159e27f4	317	else if(m_pCb)
darran	0:ac21159e27f4	318	m_pCb(r);
darran	0:ac21159e27f4	319	m_blockingResult = r; //Blocking mode
darran	0:ac21159e27f4	320	}
darran	0:ac21159e27f4	321
darran	0:ac21159e27f4	322	NTPResult NTPClient::blockingProcess() //Called in blocking mode, calls Net::poll() until return code is available
darran	0:ac21159e27f4	323	{
darran	0:ac21159e27f4	324	m_blockingResult = NTP_PROCESSING;
darran	0:ac21159e27f4	325	do
darran	0:ac21159e27f4	326	{
darran	0:ac21159e27f4	327	Net::poll();
darran	0:ac21159e27f4	328	} while(m_blockingResult == NTP_PROCESSING);
darran	0:ac21159e27f4	329	Net::poll(); //Necessary for cleanup
darran	0:ac21159e27f4	330	return m_blockingResult;
darran	0:ac21159e27f4	331	}

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	02 Jul 2010
Imports:	2
Forks:	0
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	1

services/ntp/NTPClient.cpp@0:ac21159e27f4, 2010-07-02 (annotated)

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