void
VmDnsUnlockWrite(
PVMDNS_RWLOCK pLock
)
{
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
if (!pWriteLockCount)
{
VMDNS_LOG_ERROR("Out of memory, can't decrement lock count.");
}
else
{
if (*pWriteLockCount ==1)
{
pthread_rwlock_unlock(&pLock->rwLock);
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"[UNLOCK WRITE] result write count is %u.\n",
*pWriteLockCount);
}
if (*pWriteLockCount > 0)
{
(*pWriteLockCount)--;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[--WRITE %u]\n", *pWriteLockCount);
}
else
{
VmDnsLog(VMDNS_LOG_LEVEL_ERROR,
"Unexpected unlock write, write count is %u.\n",
*pWriteLockCount);
}
}
}
static
DWORD
VmDnsForwarderMetricsDelete(
PVMDNS_FORWARDER_ENTRY pForwarderEntry
)
{
DWORD dwError = 0;
BAIL_ON_VMDNS_ERROR(dwError);
/* dwError = VmMetricsHistogramDelete(
gVmDnsMetricsContext,
pForwarderEntry->ForwarderMetricsContext.pQueryDuration);
BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmMetricsHistogramDelete(
gVmDnsMetricsContext,
pForwarderEntry->ForwarderMetricsContext.pUpdateDuration);
BAIL_ON_VMDNS_ERROR(dwError);
*/
cleanup:
return dwError;
error:
VmDnsLog(VMDNS_LOG_LEVEL_ERROR, "%s failed, error (%d)", __FUNCTION__, dwError);
goto cleanup;
}
int
VmDnsTryLockRead(
PVMDNS_RWLOCK pLock
)
{
int result = ERROR_BUSY;
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
int* pReadLockCount = VmDnsGetLockKey(&pLock->readKey);
if (pWriteLockCount && pReadLockCount)
{
if (*pWriteLockCount > 0)
{
// Simply increment a read count but don't lock for read
// as that would cause undefined behavior.
result = 0;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"Lock read when already holding %u write lock.",
*pWriteLockCount);
}
else
{
if (*pReadLockCount == 0)
{
result = pthread_rwlock_tryrdlock(&pLock->rwLock);
if (!result)
{
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"Locked for read. Result read count: %u\n",
*pReadLockCount + 1);
}
}
else
{
result = 0;
}
}
if (!result)
{
(*pReadLockCount)++;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[++READ %u]\n", *pReadLockCount);
}
}
return result;
}
DWORD
VmDnsCacheRemoveZoneProc(
PVOID pData,
PCSTR pszZone
)
{
PVMDNS_CACHE_CONTEXT pCacheContext = (PVMDNS_CACHE_CONTEXT) pData;
PVMDNS_ZONE_OBJECT pZoneObject = NULL;
DWORD dwError = 0;
dwError = VmDnsCacheFindZone(pCacheContext, pszZone, &pZoneObject);
BAIL_ON_VMDNS_ERROR_IF(dwError && dwError != ERROR_NOT_FOUND);
if (dwError == ERROR_NOT_FOUND)
{
//already deleted (probably same node)
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Zone (%s) already deleted from cache",
pszZone
);
dwError = 0;
}
else
{
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Removing Zone (%s) From Cache",
pszZone
);
dwError = VmDnsCacheRemoveZone(pCacheContext, pZoneObject);
BAIL_ON_VMDNS_ERROR(dwError);
}
cleanup:
VmDnsZoneObjectRelease(pZoneObject);
return dwError;
error:
goto cleanup;
}
int
VmDnsTryLockWrite(
PVMDNS_RWLOCK pLock
)
{
int result = ERROR_BUSY;
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
int* pReadLockCount = VmDnsGetLockKey(&pLock->readKey);
if (pWriteLockCount && pReadLockCount)
{
if (*pReadLockCount > 0)
{
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"Cannot wrlock with %u existing rdlock from same thread.\n",
*pReadLockCount);
result = ERROR_POSSIBLE_DEADLOCK;
}
else
{
if (*pWriteLockCount <= 0)
{
result = pthread_rwlock_trywrlock(&pLock->rwLock);
if (result)
{
VmDnsLog(VMDNS_LOG_LEVEL_ERROR, "trywrlock returned %u\n", result);
}
}
else
{
result = 0;
}
if (!result)
{
(*pWriteLockCount)++;
VmDnsLog(VMDNS_LOG_LEVEL_ERROR, "[++WRITE %u]\n", *pWriteLockCount);
}
}
}
return result;
}
void
VmDnsLockWrite(
PVMDNS_RWLOCK pLock
)
{
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
if (!pWriteLockCount)
{
VMDNS_LOG_WARNING("Out of memory, try plain locking.");
pthread_rwlock_wrlock(&pLock->rwLock);
}
else
{
if (*pWriteLockCount == 0)
{
pthread_rwlock_wrlock(&pLock->rwLock);
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[LOCK WRITE]");
}
(*pWriteLockCount)++;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[++WRITE %u]\n", *pWriteLockCount);
}
}
void
VmDnsUnlockRead(
PVMDNS_RWLOCK pLock
)
{
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
int* pReadLockCount = VmDnsGetLockKey(&pLock->readKey);
if (!pWriteLockCount || !pReadLockCount)
{
VMDNS_LOG_ERROR("Out of memory, can't decrement lock count.");
}
else
{
if (*pWriteLockCount > 0)
{
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "Read unlock while already holding write lock.");
}
else
{
if (*pReadLockCount ==1)
{
pthread_rwlock_unlock(&pLock->rwLock);
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[UNLOCK READ]");
}
}
if (*pReadLockCount > 0)
{
(*pReadLockCount)--;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[--READ %u]\n", *pReadLockCount);
}
else
{
VmDnsLog(VMDNS_LOG_LEVEL_ERROR, "Unexpected read unlock.");
}
}
}
void
VmDnsLockRead(
PVMDNS_RWLOCK pLock
)
{
int* pWriteLockCount = VmDnsGetLockKey(&pLock->writeKey);
int* pReadLockCount = VmDnsGetLockKey(&pLock->readKey);
if (!pWriteLockCount || !pReadLockCount)
{
VMDNS_LOG_WARNING("Out of memory, try plain locking.");
pthread_rwlock_rdlock(&pLock->rwLock);
}
else
{
if (*pWriteLockCount > 0)
{
// Simply increment a read count but don't lock for read
// as that would cause undefined behavior.
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"Lock read when already holding %u write lock.",
*pWriteLockCount);
}
else
{
if (*pReadLockCount == 0)
{
pthread_rwlock_rdlock(&pLock->rwLock);
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG,
"Actually locking for read. Result read count: %u\n",
*pReadLockCount + 1);
}
}
(*pReadLockCount)++;
VmDnsLog(VMDNS_LOG_LEVEL_DEBUG, "[++READ %u]\n", *pReadLockCount);
}
}
static
DWORD
VmDnsForwarderMetricsInit(
PVMDNS_FORWARDER_ENTRY pForwarderEntry
)
{
DWORD dwError = 0;
UINT64 buckets[] = {1, 10, 100, 300, 1000};
VM_METRICS_LABEL labelDurationOps[2][2] = {{{"operation","query"},{"forwarder",""}},
{{"operation","update"},{"forwarder",""}}};
labelDurationOps[0][1].pszValue = pForwarderEntry->pszForwarder;
labelDurationOps[1][1].pszValue = pForwarderEntry->pszForwarder;
BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmMetricsHistogramNew(
gVmDnsMetricsContext,
"vmdns_forwarder_request_duration",
labelDurationOps[0],
2,
"Forwarder Process Request Duration",
buckets,
5,
&pForwarderEntry->ForwarderMetricsContext.pQueryDuration
);
BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmMetricsHistogramNew(
gVmDnsMetricsContext,
"vmdns_forwarder_request_duration",
labelDurationOps[1],
2,
"Forwarder Process Request Duration",
buckets,
5,
&pForwarderEntry->ForwarderMetricsContext.pUpdateDuration
);
BAIL_ON_VMDNS_ERROR(dwError);
cleanup:
return dwError;
error:
VmDnsLog(VMDNS_LOG_LEVEL_ERROR, "%s failed, error (%d)", __FUNCTION__, dwError);
goto cleanup;
}
static
DWORD
VmDnsNotifyLikewiseServiceManager()
{
DWORD dwError = ERROR_SUCCESS;
PCSTR pszSmNotify = NULL;
int ret = 0;
int notifyFd = -1;
char notifyCode = 0;
// interact with likewise service manager (start/stop control)
if ((pszSmNotify = getenv("LIKEWISE_SM_NOTIFY")) != NULL)
{
notifyFd = atoi(pszSmNotify);
do
{
ret = write(notifyFd, ¬ifyCode, sizeof(notifyCode));
} while (ret != sizeof(notifyCode) && errno == EINTR);
if (ret < 0)
{
#define BUFFER_SIZE 1024
char buffer[BUFFER_SIZE]= {0};
int errorNumber = errno;
VmDnsStringErrorA( buffer, BUFFER_SIZE, errorNumber );
VmDnsLog( VMDNS_LOG_LEVEL_DEBUG,
"Could not notify service manager: %s (%i)",
buffer,
errorNumber);
dwError = LwErrnoToWin32Error(errno);
BAIL_ON_VMDNS_ERROR(dwError);
#undef BUFFER_SIZE
}
}
error:
if(notifyFd != -1)
{
close(notifyFd);
}
return dwError;
}
DWORD
VmDnsCacheEvictEntryProc(
PVMDNS_NAME_ENTRY pNameEntry,
PVMDNS_ZONE_OBJECT pZoneObject
)
{
//assumes locks for cache and hashmap are already held
DWORD dwError = 0;
//Remove if not SOA
if (VmDnsStringCompareA(
pZoneObject->pszName,
pNameEntry->pszName,
FALSE
) != 0)
{
dwError = VmDnsZoneRemoveNameEntry(
pZoneObject,
pNameEntry
);
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Purged (%s) from Zone (%s) Cache",
pNameEntry->pszName,
pZoneObject->pszName
);
}
else
{
dwError = ERROR_INVALID_PARAMETER;
}
cleanup:
return dwError;
error:
goto cleanup;
}
int
main(
int argc,
char * argv[])
{
DWORD dwError = 0;
int logLevel = VMDNS_LOG_LEVEL_INFO;
PCSTR pszLogFile = NULL;
BOOLEAN bEnableSysLog = FALSE;
//dwError = VmDnsSrvUpdateConfig();
//BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmDnsParseArgs(
argc,
argv,
&logLevel,
&pszLogFile,
&gVmdnsGlobals.iListenPort,
&bEnableSysLog,
NULL);
if(dwError != ERROR_SUCCESS)
{
ShowUsage( argv[0] );
BAIL_ON_VMDNS_ERROR(dwError);
}
vmdns_syslog_level = logLevel;
if( bEnableSysLog != FALSE )
{
vmdns_syslog = 1;
}
if (pszLogFile)
{
dwError = VmDnsAllocateStringA(
pszLogFile,
&gVmdnsGlobals.pszLogFile);
BAIL_ON_VMDNS_ERROR(dwError);
}
dwError = VmDnsConfigGetDword(VMDNS_KEY_VALUE_LOG_CAP, &gVmdnsGlobals.dwMaximumOldFiles);
if (dwError)
{
gVmdnsGlobals.dwMaximumOldFiles = VMDNS_DEFAULT_LOG_CAP;
}
dwError = VmDnsConfigGetDword(VMDNS_KEY_VALUE_LOG_SIZE, &gVmdnsGlobals.dwMaxLogSizeBytes);
if (dwError)
{
gVmdnsGlobals.dwMaxLogSizeBytes = VMDNS_DEFAULT_LOG_SIZE;
}
dwError = VmDnsLogInitialize(gVmdnsGlobals.pszLogFile,
gVmdnsGlobals.dwMaximumOldFiles,
gVmdnsGlobals.dwMaxLogSizeBytes);
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsLog(VMDNS_LOG_LEVEL_INFO, "Vmdnsd: start" );
VmDnsBlockSelectedSignals();
dwError = VmDnsInit();
BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmDnsNotifyLikewiseServiceManager();
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsdStateSet(VMDNSD_RUNNING);
// main thread waits on signals
dwError = VmDnsHandleSignals();
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsLog( VMDNS_LOG_LEVEL_INFO, "Vmdnsd exiting..." );
cleanup:
VmDnsdStateSet(VMDNS_SHUTDOWN);
VmDnsShutdown();
VmDnsLog( VMDNS_LOG_LEVEL_INFO, "Vmdnsd: stop" );
VmDnsLogTerminate();
return dwError;
error:
goto cleanup;
}
DWORD
VmDnsCacheSyncZoneProc(
PVOID pData,
PCSTR pszZone
)
{
PVMDNS_CACHE_CONTEXT pCacheContext = (PVMDNS_CACHE_CONTEXT) pData;
PVMDNS_ZONE_OBJECT pZoneObject = NULL;
DWORD dwError = 0;
DWORD dwForwarderCount = 0;
PSTR* ppszForwarders = NULL;
dwError = VmDnsCacheFindZone(
pCacheContext,
pszZone,
&pZoneObject
);
BAIL_ON_VMDNS_ERROR_IF(dwError && dwError != ERROR_NOT_FOUND);
if (dwError == ERROR_NOT_FOUND)
{
dwError = VmDnsCacheLoadZoneFromStore(pCacheContext, pszZone);
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Added Zone %s to Cache",
pszZone
);
}
else if (pZoneObject && pZoneObject->zoneId == VMDNS_ZONE_ID_FORWARDER)
{
dwError = VmDnsStoreGetForwarders(
pszZone,
&dwForwarderCount,
&ppszForwarders);
BAIL_ON_VMDNS_ERROR_IF(dwError && dwError != ERROR_NO_DATA);
dwError = 0;
if (dwForwarderCount > 0 && *ppszForwarders)
{
dwError = VmDnsSetForwarders(
pZoneObject->pForwarderContext,
pszZone,
dwForwarderCount,
ppszForwarders);
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsFreeStringCountedArrayA(ppszForwarders, dwForwarderCount);
ppszForwarders = NULL;
dwForwarderCount = 0;
}
}
cleanup:
VmDnsZoneObjectRelease(pZoneObject);
if (ppszForwarders)
{
VmDnsFreeStringCountedArrayA(ppszForwarders, dwForwarderCount);
}
return dwError;
error:
goto cleanup;
}
DWORD
VmDnsCachePurgeRecord(
PVMDNS_ZONE_OBJECT pZoneObject,
PCSTR pszRecord,
DWORD dwCachePurgeEvent
)
{
PVMDNS_RECORD_LIST pList = NULL;
DWORD dwError = 0;
if (VmDnsStringCompareA(pZoneObject->pszName, pszRecord, FALSE) == 0)
{
//update SOA record
dwError = VmDnsStoreGetRecords(
pZoneObject->pszName,
pZoneObject->pszName,
&pList
);
BAIL_ON_VMDNS_ERROR(dwError);
dwError = VmDnsZoneUpdateRecords(
pZoneObject,
pZoneObject->pszName,
pList
);
BAIL_ON_VMDNS_ERROR(dwError);
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Refreshed (%s) in Cache",
pZoneObject->pszName
);
}
else
{
dwError = VmDnsZonePurgeRecords(pZoneObject, pszRecord);
BAIL_ON_VMDNS_ERROR_IF(dwError && dwError != ERROR_NOT_FOUND)
if (dwError == ERROR_NOT_FOUND)
{
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Record (%s) not found in Cache",
pszRecord
);
dwError = 0;
}
else
{
if (dwCachePurgeEvent == CACHE_PURGE_MODIFICATION)
{
VmMetricsCounterIncrement(gVmDnsCounterMetrics[CACHE_MODIFY_PURGE_COUNT]);
}
else if (dwCachePurgeEvent == CACHE_PURGE_REPLICATION)
{
VmMetricsCounterIncrement(gVmDnsCounterMetrics[CACHE_NOTIFY_PURGE_COUNT]);
}
VmDnsLog(
VMDNS_LOG_LEVEL_DEBUG,
"Succesfully Purged (%s) from Cache",
pszRecord
);
}
}
cleanup:
if (pList)
{
VmDnsRecordListRelease(pList);
}
return dwError;
error:
goto cleanup;
}
