ReactOS 0.4.15-dev-8116-gf69e256
ntpclient.c
Go to the documentation of this file.
1/*
2 * PROJECT: ReactOS Timedate Control Panel
3 * LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
4 * PURPOSE: Queries the NTP server
5 * COPYRIGHT: Copyright 2006 Ged Murphy <gedmurphy@gmail.com>
6 */
7
8#include "w32time.h"
9
10#include <winsock2.h>
11
12#define TIMEOUT 4000 /* 4 second timeout */
13
14typedef struct _INFO
15{
22
23
24static BOOL
26 LPSTR lpAddress)
27{
28 WSADATA wsaData;
29 HOSTENT *he;
30 INT Ret;
31
32 Ret = WSAStartup(MAKEWORD(2, 2),
33 &wsaData);
34 if (Ret != 0)
35 return FALSE;
36
37 pInfo->Sock = socket(AF_INET,
39 0);
40 if (pInfo->Sock == INVALID_SOCKET)
41 return FALSE;
42
43 /* Setup server info */
44 he = gethostbyname(lpAddress);
45 if (he != NULL)
46 {
47 /* Setup server socket info */
48 ZeroMemory(&pInfo->ntpAddr, sizeof(SOCKADDR_IN));
49 pInfo->ntpAddr.sin_family = AF_INET; // he->h_addrtype;
50 pInfo->ntpAddr.sin_port = htons(NTPPORT);
51 pInfo->ntpAddr.sin_addr = *((struct in_addr *)he->h_addr);
52 }
53 else
54 return FALSE;
55
56 return TRUE;
57}
58
59
60static VOID
62{
63 WSACleanup();
64}
65
66
67static BOOL
69{
70 return TRUE;
71}
72
73
74/* Send some data to wake the server up */
75static BOOL
77{
78 TIMEPACKET tp = { 0, 0 };
79 INT Ret;
80
81 ZeroMemory(&pInfo->SendPacket, sizeof(pInfo->SendPacket));
82 pInfo->SendPacket.LiVnMode = 0x1b; /* 0x1b = 011 011 - version 3 , mode 3 (client) */
83 if (!GetTransmitTime(&tp))
84 return FALSE;
86
87 Ret = sendto(pInfo->Sock,
88 (char *)&pInfo->SendPacket,
89 sizeof(pInfo->SendPacket),
90 0,
91 (SOCKADDR *)&pInfo->ntpAddr,
92 sizeof(SOCKADDR_IN));
93
94 if (Ret == SOCKET_ERROR)
95 return FALSE;
96
97 return TRUE;
98}
99
100
101static ULONG
103{
104 TIMEVAL timeVal;
105 FD_SET readFDS;
106 INT Ret;
107 ULONG ulTime = 0;
108
109 /* Monitor socket for incoming connections */
110 FD_ZERO(&readFDS);
111 FD_SET(pInfo->Sock, &readFDS);
112
113 /* Set timeout values */
114 timeVal.tv_sec = TIMEOUT / 1000;
115 timeVal.tv_usec = TIMEOUT % 1000;
116
117 /* Check for data on the socket for TIMEOUT millisecs */
118 Ret = select(0, &readFDS, NULL, NULL, &timeVal);
119
120 if ((Ret != SOCKET_ERROR) && (Ret != 0))
121 {
122 Ret = recvfrom(pInfo->Sock,
123 (char *)&pInfo->RecvPacket,
124 sizeof(pInfo->RecvPacket),
125 0,
126 NULL,
127 NULL);
128
129 if (Ret != SOCKET_ERROR)
131 }
132
133 return ulTime;
134}
135
136
137ULONG
139{
140 PINFO pInfo;
141 LPSTR lpAddr;
142 DWORD dwSize = wcslen(lpAddress) + 1;
143 ULONG ulTime = 0;
144
145 pInfo = (PINFO)HeapAlloc(GetProcessHeap(),
146 0,
147 sizeof(INFO));
148 lpAddr = (LPSTR)HeapAlloc(GetProcessHeap(),
149 0,
150 dwSize);
151
152 if (pInfo && lpAddr)
153 {
155 0,
156 lpAddress,
157 -1,
158 lpAddr,
159 dwSize,
160 NULL,
161 NULL))
162 {
163 if (InitConnection(pInfo, lpAddr))
164 {
165 if (SendData(pInfo))
166 {
167 ulTime = ReceiveData(pInfo);
168 }
169 }
170
172 }
173 }
174
175 if (pInfo)
176 HeapFree(GetProcessHeap(), 0, pInfo);
177 if (lpAddr)
178 HeapFree(GetProcessHeap(), 0, lpAddr);
179
180 return ulTime;
181}
#define NULL
Definition: types.h:112
#define TRUE
Definition: types.h:120
#define FALSE
Definition: types.h:117
#define GetProcessHeap()
Definition: compat.h:736
#define CP_ACP
Definition: compat.h:109
#define HeapAlloc
Definition: compat.h:733
#define HeapFree(x, y, z)
Definition: compat.h:735
#define WideCharToMultiByte
Definition: compat.h:111
INT WSAAPI recvfrom(IN SOCKET s, OUT CHAR FAR *buf, IN INT len, IN INT flags, OUT LPSOCKADDR from, IN OUT INT FAR *fromlen)
Definition: recv.c:87
INT WSAAPI select(IN INT s, IN OUT LPFD_SET readfds, IN OUT LPFD_SET writefds, IN OUT LPFD_SET exceptfds, IN CONST struct timeval *timeout)
Definition: select.c:41
INT WSAAPI sendto(IN SOCKET s, IN CONST CHAR FAR *buf, IN INT len, IN INT flags, IN CONST struct sockaddr *to, IN INT tolen)
Definition: send.c:82
INT WINAPI WSAStartup(IN WORD wVersionRequested, OUT LPWSADATA lpWSAData)
Definition: startup.c:113
_In_ uint64_t _In_ uint64_t _In_ uint64_t _In_opt_ traverse_ptr * tp
Definition: btrfs.c:2996
#define AF_INET
Definition: tcpip.h:117
unsigned int BOOL
Definition: ntddk_ex.h:94
unsigned long DWORD
Definition: ntddk_ex.h:95
PHOSTENT WSAAPI gethostbyname(IN const char FAR *name)
Definition: getxbyxx.c:221
_CRTIMP size_t __cdecl wcslen(_In_z_ const wchar_t *_Str)
#define htons(x)
Definition: module.h:215
#define ntohl(x)
Definition: module.h:205
PSDBQUERYRESULT_VISTA PVOID DWORD * dwSize
Definition: env.c:56
#define TIMEOUT
Definition: ntpclient.c:12
struct _INFO INFO
static BOOL SendData(PINFO pInfo)
Definition: ntpclient.c:76
static VOID DestroyConnection(VOID)
Definition: ntpclient.c:61
struct _INFO * PINFO
static BOOL InitConnection(PINFO pInfo, LPSTR lpAddress)
Definition: ntpclient.c:25
ULONG GetServerTime(LPWSTR lpAddress)
Definition: ntpclient.c:138
static ULONG ReceiveData(PINFO pInfo)
Definition: ntpclient.c:102
static BOOL GetTransmitTime(PTIMEPACKET ptp)
Definition: ntpclient.c:68
SOCKET WSAAPI socket(IN INT af, IN INT type, IN INT protocol)
Definition: socklife.c:143
Definition: precomp.h:84
SOCKADDR_IN ntpAddr
Definition: ntpclient.c:18
SOCKADDR_IN myAddr
Definition: ntpclient.c:17
NTPPACKET RecvPacket
Definition: ntpclient.c:20
NTPPACKET SendPacket
Definition: ntpclient.c:19
SOCKET Sock
Definition: ntpclient.c:16
TIMEPACKET TransmitTimestamp
Definition: w32time.h:43
BYTE LiVnMode
Definition: w32time.h:33
DWORD dwInteger
Definition: w32time.h:26
Definition: winsock.h:66
Definition: tcpip.h:126
struct in_addr sin_addr
Definition: winsock.h:512
short sin_family
Definition: winsock.h:510
u_short sin_port
Definition: winsock.h:511
unsigned long tv_sec
Definition: linux.h:1738
unsigned long tv_usec
Definition: linux.h:1739
#define MAKEWORD(a, b)
Definition: typedefs.h:248
int32_t INT
Definition: typedefs.h:58
uint32_t ULONG
Definition: typedefs.h:59
#define NTPPORT
Definition: w32time.h:18
#define ZeroMemory
Definition: winbase.h:1712
#define FD_ZERO(set)
Definition: winsock.h:96
int PASCAL FAR WSACleanup(void)
Definition: startup.c:60
#define INVALID_SOCKET
Definition: winsock.h:332
#define SOCK_DGRAM
Definition: winsock.h:336
UINT_PTR SOCKET
Definition: winsock.h:47
#define SOCKET_ERROR
Definition: winsock.h:333
#define FD_SET(fd, set)
Definition: winsock.h:89
char * LPSTR
Definition: xmlstorage.h:182
WCHAR * LPWSTR
Definition: xmlstorage.h:184