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windows-nt-4.0/private/net/svcdlls/upssvc/subr.c

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/*++
Copyright (c) 1992-1996 Microsoft Corporation
Module Name:
subr.c
Abstract:
This module contains the subrountines for the UPS service.
Author:
Kin Hong Kan (t-kinh)
Revision History:
Who When What
-------- -------- ----------------------------------------------
t-kinh 8/20/92 Created.
vladimv 1992 Big reorgs. Make it look like a real service.
ericb 10/25/95 fix bug 8133 - make shutdown wait configurable
Notes:
--*/
#include "ups.h"
extern HANDLE UpsGlobalLogFileHandle;
extern UPS_CONFIG UpsGlobalConfig;
extern UPS_TIME UpsGlobalBatteryTime;
extern CHAR UpsGlobalCommand[ MAX_PATH];
BOOL
UpsGetKeyValue(
HKEY MyKey,
LPTSTR SubKey,
DWORD min,
DWORD max,
LPDWORD ret
);
// these values are also defined in the UPS applet...
#define REGISTRY_UPS_DIRECTORY "System\\CurrentControlSet\\Services\\UPS"
#define REGISTRY_PORT "Port"
#define REGISTRY_OPTIONS "Options"
#define REGISTRY_BATTERY_LIFE "BatteryLife"
#define REGISTRY_RECHARGE_RATE "RechargeRate"
#define REGISTRY_FIRST_MESSAGE_DELAY "FirstMessageDelay"
#define REGISTRY_MESSAGE_INTERVAL "MessageInterval"
#define REGISTRY_COMMAND_FILE "CommandFile"
// additional ones for sending out messages and alerts
#define REGISTRY_COMPUTER_NAME "ComputerName"
#define REGISTRY_COMPUTER_NAME_DIRECTORY \
"System\\CurrentControlSet\\Control\\ComputerName\\ComputerName"
#define REGISTRY_SHUTDOWN_WAIT "ShutdownWait"
VOID
UpsAlertRaise(
DWORD MessageId
)
/*++
Routine Description:
Sends an alert.
Arguments:
MessageId - The Message Id of the alert as defined in netmsg.h
Return Value:
None.
Notes:
NetAlertRaise() only supports unicode version, that results in
the Computer name is hardwired to wchat_t.
--*/
{
CHAR buff[ (sizeof(ADMIN_OTHER_INFO) + 2 * (MAX_PATH+1))];
LPTSTR CompName;
LPADMIN_OTHER_INFO OInfo;
DWORD status;
OInfo = (LPADMIN_OTHER_INFO)buff;
OInfo->alrtad_errcode = MessageId;
OInfo->alrtad_numstrings = 1;
CompName = (buff + sizeof(ADMIN_OTHER_INFO));
wcscpy(
(LPWSTR)CompName,
(LPWSTR)UpsGlobalConfig.ComputerName
);
status = NetAlertRaiseEx(
L"ADMIN", // alert type
buff, // info buffer
sizeof(buff), // info size
L"UPS" // service name
);
if ( status != 0) {
// This occurs if for example alerter service has not been started.
KdPrint(("[UPS] NetAlertRaise() returns status = %ld\n", status));
}
}
BOOL
UpsGetCommand(
HKEY UpsKey,
PCHAR CommandFileBuffer,
DWORD CommandFileBufferSize
)
/*++
Routine Description:
Reads registry to find out the value of CommandFile and initialize
UpsGlobalCommand.
It returns TRUE if it does not find an entry for CommandFile, or if
it finds a valid entry for CommandFile. In this latter case it
initializes UpsGlobalCommand to point to a command exec string.
It returns FALSE if it finds an invalid entry for CommandFile, or fails
initializing UpsGlobalCommand for any other reason.
Arguments:
UpsKey - Registry key to UPS service configuration.
CommandFileBuffer - Buffer for command file.
CommandFileBufferSize - Size in bytes of CommandFileBuffer.
Return Value:
TRUE - Did not find an entry or found a valid entry.
FALSE - Found an invalid entry.
--*/
{
DWORD status;
DWORD length;
DWORD type;
DWORD SpaceLeft;
DWORD CommandFileLength;
status = RegQueryValueEx(
UpsKey,
REGISTRY_COMMAND_FILE,
NULL,
&type,
(LPBYTE)CommandFileBuffer,
&CommandFileBufferSize
);
if ( status == ERROR_FILE_NOT_FOUND) {
return( TRUE); // value is not present in the registry
}
if ( status != ERROR_SUCCESS || type != REG_SZ ||
CommandFileBufferSize == 0) {
return( FALSE); // an invalid error or invalid type
}
// subtract terminating null
CommandFileLength = CommandFileBufferSize - sizeof( CommandFileBuffer[0]);
if ( CommandFileLength == 0) {
return( TRUE); // an empty string is OK
}
SpaceLeft = sizeof( UpsGlobalCommand);
length = GetSystemDirectory(
UpsGlobalCommand,
SpaceLeft
);
if ( length == 0 || length >= SpaceLeft) {
return( FALSE);
}
if ( UpsGlobalCommand[ length - 1] != '\\') {
UpsGlobalCommand[ length] = '\\';
if ( ++length >= SpaceLeft) {
return( FALSE);
}
UpsGlobalCommand[ length] = '\0';
}
if ( length + CommandFileLength + 1 >= SpaceLeft) {
return( FALSE);
}
strcpy( UpsGlobalCommand + length, CommandFileBuffer);
type = GetFileAttributes( UpsGlobalCommand);
if ( (type & FILE_ATTRIBUTE_DIRECTORY) != 0) {
return( FALSE);
}
return( TRUE);
}
BOOL
UpsGetConfig(
VOID
)
/*++
Routine Descrption:
Open the required keys to the registry to read in the configuration of
the UPS service and the name of the local system. Range checks are being
done for numerical entries of the UPS configuation.
Return Value:
TRUE - all values are put in the Config structure.
FALSE - either one of the following cases:
a. Can't open registry key.
b. Can't read any required value.
c. The values are not within the defined range.
--*/
{
DWORD status;
HKEY RegistryKey;
DWORD value;
CHAR temp[ MAX_PATH];
DWORD size;
DWORD type;
status = RegOpenKeyEx(
HKEY_LOCAL_MACHINE,
REGISTRY_UPS_DIRECTORY,
0,
KEY_READ,
&RegistryKey // key to UPS service configuration
);
if ( status != ERROR_SUCCESS){
KdPrint(("[UPS] Cannot open registry key, error_code %d\n", status));
return( FALSE);
}
if (FALSE == UpsGetKeyValue(
RegistryKey,
REGISTRY_OPTIONS,
0,
0XFFFFFFFF, // no range check for mask
&value)) {
return( FALSE);
}
UpsGlobalConfig.Options = value; // Options value
if (! (UpsGlobalConfig.Options & UPS_INSTALLED)) {
KdPrint(("[UPS] UPS not installed\n"));
return( FALSE); // UPS must be installed
}
if (!(UpsGlobalConfig.Options & (UPS_LOWBATTERYSIGNAL | UPS_POWERFAILSIGNAL))) {
KdPrint(("[UPS] no signal lines supported - Options %d\n", UpsGlobalConfig.Options));
return( FALSE); // UPS must support signalling
}
if (FALSE == UpsGetKeyValue(
RegistryKey,
REGISTRY_BATTERY_LIFE,
MINBATTERYLIFE,
MAXBATTERYLIFE,
&value)) {
return( FALSE);
}
UpsGlobalConfig.BatteryLife = value; // BatterLife value
if (FALSE == UpsGetKeyValue(
RegistryKey,
REGISTRY_RECHARGE_RATE,
MINRECHARGEPERMINUTE,
MAXRECHARGEPERMINUTE,
&value)) {
return( FALSE);
}
UpsGlobalConfig.RechargeRate = value; // RechargeRate value
if (FALSE == UpsGetKeyValue(
RegistryKey,
REGISTRY_FIRST_MESSAGE_DELAY,
MINFIRSTWARNING,
MAXFIRSTWARNING,
&value)) {
return( FALSE);
}
UpsGlobalConfig.FirstMessageDelay = value; // FirstMessageDelay
if (FALSE == UpsGetKeyValue(
RegistryKey,
REGISTRY_MESSAGE_INTERVAL,
MINWARNINGINTERVAL,
MAXWARNINGINTERVAL,
&value)) {
return( FALSE);
}
UpsGlobalConfig.MessageInterval = value; // MessageInterval
//
// configurable shutdown wait interval
//
size = sizeof(value);
status = RegQueryValueEx(RegistryKey,
REGISTRY_SHUTDOWN_WAIT,
NULL,
NULL,
(LPBYTE)&value,
&size);
if (status != ERROR_SUCCESS)
{ // if a value is not stored in the registry, use the default;
value = DEFAULTSHUTDOWNWAIT;
}
else
{
if (MAXSHUTDOWNWAIT < value)
{
value = MAXSHUTDOWNWAIT;
}
}
UpsGlobalConfig.ShutdownWait = value;
KdPrint(("[UPS] ShutdownWait set to %d\n", value));
size = sizeof(temp);
status = RegQueryValueEx(
RegistryKey,
REGISTRY_PORT,
NULL,
&type,
(LPBYTE)&temp,
&size
);
if (status != ERROR_SUCCESS) {
KdPrint((
"[UPS] Can't get value of %s error_code - %d\n",
REGISTRY_PORT,
status
));
return( FALSE);
}
// Copy the comm port string, stripping the colon at the end.
strncpy(
(PCHAR)UpsGlobalConfig.Port,
temp,
strlen( temp)-1
);
if ( UpsGlobalConfig.Options & UPS_COMMANDFILE
&& UpsGetCommand( RegistryKey, temp, sizeof( temp)) == FALSE) {
KdPrint((
"[UPS] Bad value of %s \n",
REGISTRY_COMMAND_FILE
));
//
// Just log an event and send an alert. This problem is assumed
// to be benign enough so that we do not want to abort the startup
// on this account.
//
UpsReportEvent( NELOG_UPS_CmdFileConfig, NULL, ERROR_SUCCESS);
UpsAlertRaise( ALERT_CmdFileConfig);
}
RegCloseKey( RegistryKey); // done with service configuration
status = RegOpenKeyEx(
HKEY_LOCAL_MACHINE, //Open Reg Key
REGISTRY_COMPUTER_NAME_DIRECTORY,
0,
KEY_READ,
&RegistryKey // key for computer name
);
if (status != ERROR_SUCCESS){
KdPrint(("[UPS] Can't open registry key, error_code %d\n", status));
return( FALSE);
}
// ComputerName is hardwired UNICODE string, since NetAlertRaise()
// and UPSNotifyUsers() don't take in ANSI string... Remove conversion
// when ANSI is supported....
size = sizeof(temp);
status = RegQueryValueEx(
RegistryKey,
REGISTRY_COMPUTER_NAME,
NULL,
&type,
(LPBYTE)&temp,
&size
);
if (strlen(temp) > sizeof( UpsGlobalConfig.ComputerName ) / sizeof( UpsGlobalConfig.ComputerName[0])) {
KdPrint(("[UPS] Computer name too long\n"));
return( FALSE);
}
if (0 == MultiByteToWideChar(
CP_ACP,
MB_PRECOMPOSED,
temp,
strlen(temp)+1, //copy null char also
(LPWSTR) UpsGlobalConfig.ComputerName,
sizeof(UpsGlobalConfig.ComputerName)/sizeof(UpsGlobalConfig.ComputerName[0]))) {
KdPrint(("[UPS]CompName not translated to Unicode, %ld\n",
GetLastError()));
return( FALSE);
}
if (status != ERROR_SUCCESS) {
KdPrint((
"[UPS] Can't get value of %s error_code - %d\n",
REGISTRY_COMPUTER_NAME,
status
));
return( FALSE);
}
return( TRUE);
}
BOOL
UpsGetKeyValue(
HKEY RegistryKey,
LPTSTR SubKey,
DWORD min,
DWORD max,
LPDWORD ret
)
/*++
Routine Description:
Get a numerical key value from the registry when given a key and
subkey to the registry. The numeric value is returned if the value
passes the range check.
Arguments:
RegistryKey - Opened key to the registry.
SubKey - Name of the subkey to be read from registry.
min - minimum value for the range check (exclusive)
max - maximum value for the range check (exclusive)
ret - pointer to a DWORD to return the numeric value
Return Value:
TRUE - the value is successfully read from the registry and
passed the range check
FALSE - the value is not read from the registry, or the value
doesn't pass the range test.
--*/
{
DWORD temp;
LONG status;
DWORD size;
DWORD type;
size = sizeof(DWORD);
status = RegQueryValueEx(
RegistryKey,
SubKey,
NULL,
&type,
(LPBYTE)&temp,
&size
);
if (status != ERROR_SUCCESS) {
KdPrint((
"[UPS] Can't get value of %s error_code - %d\n",
SubKey,
status
));
return( FALSE);
}
if ( ((DWORD)temp < min) || ((DWORD)temp > max)) {
KdPrint((
"[UPS] Value of %s not in range - %d\n",
SubKey,
(DWORD)temp
));
return( FALSE);
}
*ret = temp;
return( TRUE);
}
BOOL
UpsLineAsserted(
DWORD ModemStatus,
DWORD Line
)
/*++
Routine Descriptions:
Checking if a specified signal, either LINE_FAIL or LOW_POWER, is
asserted or not. This is tricky, since:
1. assertion can be either positive voltage level, or negative voltage
level, as defined by UpsGlobalConfig.
2. SET means positive voltage in GetCommModemStatus.
Arguments:
ModemStatus- CommPort as returned by GetCommModemStatus()
Line - either LINE_FAIL or LOW_POWER
Return Value: TRUE if asserted
FALSE if not asserted
--*/
{
DWORD status, assertion;
status = Line & ModemStatus;
assertion = (Line == LINE_FAIL) ?
(UpsGlobalConfig.Options & UPS_POSSIGONPOWERFAIL) :
(UpsGlobalConfig.Options & UPS_POSSIGONLOWBATTERY);
if (status) { //line positive
if (assertion){ //positive asssertion
return TRUE;}
else{ //negative assertion
return FALSE;}
}
else { //line negative
if (assertion){ //positive assertion
return FALSE;}
else{
return TRUE;} //negative assertion
}
}
VOID
UpsReportEvent(
DWORD MessageId,
PCHAR SingleString,
DWORD Error
)
/*++
Routine Descriptions:
Calls ReportEvent to write to a system event log.
Arguments:
MessageId - The Message Id of the event defined in lmerrlog.h
String - Pointer to a single insertion string - or NULL if there
is no string to insert.
Error - Error code to log as data - or ERROR_SUCCESS if there
is no error code to log.
Return Value:
None.
--*/
{
WORD eventType;
WORD cStrings; // count of insertion strings
LPTSTR Strings[1]; // array of insertion strings
LPTSTR * pStrings; // pointer to array of insertion strings
DWORD cbData; // count of data (in bytes)
LPVOID pData; // pointer to data
eventType = (MessageId > ERRLOG_BASE) ?
EVENTLOG_WARNING_TYPE : EVENTLOG_ERROR_TYPE;
if ( Error == ERROR_SUCCESS) {
pData = NULL;
cbData = 0;
} else {
pData = &Error;
cbData = sizeof( Error);
}
if ( SingleString == NULL) {
pStrings = NULL;
cStrings = 0;
} else {
Strings[ 0] = SingleString;
pStrings = Strings;
cStrings = 1;
}
KdPrint(("[UPS] ReportEvent(): MessageId = (dec)%d\n", MessageId));
if ( !ReportEvent(
UpsGlobalLogFileHandle, // handle
eventType, // event type
0, // event category,
MessageId, // message id
NULL, // user id
cStrings, // number of strings
cbData, // number of data bytes
pStrings, // array of strings
pData // data buffer
)) {
KdPrint(("[UPS] ReportEvent: error = (dec)%d\n", GetLastError()));
}
}
VOID
UpsUpdateTime(
DWORD Status
)
/*++
Routine Descriptions:
Update the BatteryTime sturcture. If Status is passed DISCHARGE, the
amount of time that between "MarkTime" and now is subtrated from
"StoredTime". If Status is passed CHARGE, the time would be divided by
the recharge rate in the Config and added to the Stored time.
Arguments:
Status - indicating what happened for the time elapsed
can either be CHARGE or DISCHARGE.
Return Value:
None.
--*/
{
time_t CurrentTime, TimeElapsed, MaxLife;
MaxLife = UpsGlobalConfig.BatteryLife * 60;
CurrentTime = time((time_t *)NULL);
TimeElapsed = CurrentTime - UpsGlobalBatteryTime.MarkTime;
ASSERT( TimeElapsed >=0 && (Status == CHARGE || Status == DISCHARGE));
UpsGlobalBatteryTime.MarkTime = CurrentTime;
if ( Status == CHARGE) {
if (UpsGlobalConfig.RechargeRate == 0) { // just in case
UpsGlobalBatteryTime.StoredTime = MaxLife;
} else {
UpsGlobalBatteryTime.StoredTime +=
(TimeElapsed / UpsGlobalConfig.RechargeRate);
if ( UpsGlobalBatteryTime.StoredTime > MaxLife) {
UpsGlobalBatteryTime.StoredTime = MaxLife;
}
}
} else {
UpsGlobalBatteryTime.StoredTime =
(UpsGlobalBatteryTime.StoredTime > TimeElapsed) ?
(UpsGlobalBatteryTime.StoredTime - TimeElapsed) : 0;
}
}