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[W32TIME] Use a reasonable fallback of 9 hours. (#1724)

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CORE-16181

This allows preventing spamming the time servers if the registry entry
becomes corrupted or missing. Also, disallow a setting of less than
2 minutes for the same reasons, and instead use the fallback of 9 hours.
This commit is contained in:
Benjamin Aerni 2019-07-12 23:42:10 -07:00 committed by Hermès Bélusca-Maïto
parent 7f59361911
commit 5b9543c31a
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GPG key ID: 3B2539C65E7B93D0
1 changed files with 13 additions and 11 deletions
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24
base/services/w32time/w32time.c
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@ -129,16 +129,18 @@ GetIntervalSetting(VOID)
LONG lRet; LONG lRet;
dwData = 0; dwData = 0;
if (RegOpenKeyExW(HKEY_LOCAL_MACHINE, lRet = RegOpenKeyExW(HKEY_LOCAL_MACHINE,
L"SYSTEM\\CurrentControlSet\\Services\\W32Time\\TimeProviders\\NtpClient", L"SYSTEM\\CurrentControlSet\\Services\\W32Time\\TimeProviders\\NtpClient",
0, 0,
KEY_QUERY_VALUE, KEY_QUERY_VALUE,
&hKey) == ERROR_SUCCESS) &hKey);
if (lRet == ERROR_SUCCESS)
{ {
/* This key holds the update interval in seconds /*
* It is useful for testing to set it to a value of 10 (Decimal) * This key holds the update interval in seconds.
* This will cause the clock to try and update every 10 seconds * It is useful for testing to set it to a value of 10 (Decimal).
* So you can change the time and expect it to be set back correctly in 10-20 seconds * This will cause the clock to try and update every 10 seconds.
* So you can change the time and expect it to be set back correctly in 10-20 seconds.
*/ */
lRet = RegQueryValueExW(hKey, lRet = RegQueryValueExW(hKey,
L"SpecialPollInterval", L"SpecialPollInterval",
@ -149,8 +151,8 @@ GetIntervalSetting(VOID)
RegCloseKey(hKey); RegCloseKey(hKey);
} }
if (lRet != ERROR_SUCCESS) if (lRet != ERROR_SUCCESS || dwData < 120)
return 0; return 9 * 60 * 60; // 9 hours, because Windows uses 9 hrs, 6 mins and 8 seconds by default.
else else
return dwData; return dwData;
} }