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pdh.go
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pdh.go
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//go:build windows
// +build windows
/*
** Zabbix
** Copyright (C) 2001-2023 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
package win32
import (
"errors"
"fmt"
"syscall"
"time"
"unsafe"
"git.zabbix.com/ap/plugin-support/log"
"golang.org/x/sys/windows"
)
const (
PDH_CSTATUS_VALID_DATA = 0x00000000
PDH_CSTATUS_NEW_DATA = 0x00000001
PDH_CSTATUS_INVALID_DATA = 0xC0000BBA
PDH_MORE_DATA = 0x800007D2
PDH_NO_DATA = 0x800007D5
PDH_INVALID_DATA = 0xc0000bc6
PDH_CALC_NEGATIVE_DENOMINATOR = 0x800007D6
PDH_FMT_DOUBLE = 0x00000200
PDH_FMT_LARGE = 0x00000400
PDH_FMT_NOCAP100 = 0x00008000
PDH_MAX_COUNTER_NAME = 1024
PERF_DETAIL_WIZARD = 400
)
var (
NegDenomErr = newPdhError(PDH_CALC_NEGATIVE_DENOMINATOR)
hPdh = mustLoadLibrary("pdh.dll")
pdhOpenQuery = hPdh.mustGetProcAddress("PdhOpenQuery")
pdhCloseQuery = hPdh.mustGetProcAddress("PdhCloseQuery")
pdhAddCounter = hPdh.mustGetProcAddress("PdhAddCounterW")
pdhAddEnglishCounter = hPdh.mustGetProcAddress("PdhAddEnglishCounterW")
pdhCollectQueryData = hPdh.mustGetProcAddress("PdhCollectQueryData")
pdhGetFormattedCounterValue = hPdh.mustGetProcAddress("PdhGetFormattedCounterValue")
pdhParseCounterPath = hPdh.mustGetProcAddress("PdhParseCounterPathW")
pdhMakeCounterPath = hPdh.mustGetProcAddress("PdhMakeCounterPathW")
pdhLookupPerfNameByIndex = hPdh.mustGetProcAddress("PdhLookupPerfNameByIndexW")
pdhLookupPerfIndexByName = hPdh.mustGetProcAddress("PdhLookupPerfIndexByNameW")
pdhRemoveCounter = hPdh.mustGetProcAddress("PdhRemoveCounter")
pdhEnumObjectItems = hPdh.mustGetProcAddress("PdhEnumObjectItemsW")
pdhEnumObjects = hPdh.mustGetProcAddress("PdhEnumObjectsW")
)
type Instance struct {
Name string `json:"{#INSTANCE}"`
}
func PdhOpenQuery(dataSource *string, userData uintptr) (query PDH_HQUERY, err error) {
var source uintptr
if dataSource != nil {
wcharSource := windows.StringToUTF16(*dataSource)
source = uintptr(unsafe.Pointer(&wcharSource[0]))
}
ret, _, _ := syscall.Syscall(pdhOpenQuery, 3, source, userData, uintptr(unsafe.Pointer(&query)))
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return 0, newPdhError(ret)
}
return
}
func PdhCloseQuery(query PDH_HQUERY) (err error) {
ret, _, _ := syscall.Syscall(pdhCloseQuery, 1, uintptr(query), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return newPdhError(ret)
}
return nil
}
func PdhAddCounter(query PDH_HQUERY, path string, userData uintptr) (counter PDH_HCOUNTER, err error) {
wcharPath, _ := syscall.UTF16PtrFromString(path)
ret, _, _ := syscall.Syscall6(pdhAddCounter, 4, uintptr(query), uintptr(unsafe.Pointer(wcharPath)), userData,
uintptr(unsafe.Pointer(&counter)), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return 0, newPdhError(ret)
}
return
}
func PdhAddEnglishCounter(query PDH_HQUERY, path string, userData uintptr) (counter PDH_HCOUNTER, err error) {
wcharPath, _ := syscall.UTF16PtrFromString(path)
ret, _, _ := syscall.Syscall6(pdhAddEnglishCounter, 4, uintptr(query), uintptr(unsafe.Pointer(wcharPath)), userData,
uintptr(unsafe.Pointer(&counter)), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return 0, newPdhError(ret)
}
return
}
func PdhCollectQueryData(query PDH_HQUERY) (err error) {
ret, _, _ := syscall.Syscall(pdhCollectQueryData, 1, uintptr(query), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return newPdhError(ret)
}
return nil
}
func PdhGetFormattedCounterValueDouble(counter PDH_HCOUNTER, tryCount int) (*float64, error) {
tryCount--
value, err := getCounterValueDouble(counter)
if err != nil {
if !errors.Is(err, NegDenomErr) || tryCount <= 0 {
return nil, err
}
log.Debugf(
"Detected performance counter with negative denominator, retrying in 1 second",
)
time.Sleep(time.Second)
return PdhGetFormattedCounterValueDouble(counter, tryCount)
}
return value, nil
}
func PdhGetFormattedCounterValueInt64(counter PDH_HCOUNTER) (value *int64, err error) {
return PdhGetFormattedCounterValueInt64Helper(counter, true)
}
func PdhGetFormattedCounterValueInt64Helper(counter PDH_HCOUNTER, retry bool) (value *int64, err error) {
var pdhValue PDH_FMT_COUNTERVALUE_LARGE
ret, _, _ := syscall.Syscall6(pdhGetFormattedCounterValue, 4, uintptr(counter), uintptr(PDH_FMT_LARGE), 0,
uintptr(unsafe.Pointer(&pdhValue)), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
if ret == PDH_CALC_NEGATIVE_DENOMINATOR {
if retry {
log.Debugf("Detected performance counter with negative denominator, retrying in 1 second")
time.Sleep(time.Second)
return PdhGetFormattedCounterValueInt64Helper(counter, false)
}
log.Warningf("Detected performance counter with negative denominator the second time after retry, giving up...")
} else if ret == PDH_INVALID_DATA || ret == PDH_CSTATUS_INVALID_DATA {
return nil, nil
}
return nil, newPdhError(ret)
}
return &pdhValue.Value, nil
}
func PdhRemoveCounter(counter PDH_HCOUNTER) (err error) {
ret, _, _ := syscall.Syscall(pdhRemoveCounter, 1, uintptr(counter), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return newPdhError(ret)
}
return nil
}
func PdhParseCounterPath(path string) (elements *PDH_COUNTER_PATH_ELEMENTS, err error) {
wPath := windows.StringToUTF16(path)
ptrPath := uintptr(unsafe.Pointer(&wPath[0]))
var size uint32
ret, _, _ := syscall.Syscall6(pdhParseCounterPath, 4, ptrPath, 0, uintptr(unsafe.Pointer(&size)), 0, 0, 0)
if ret != PDH_MORE_DATA && syscall.Errno(ret) != windows.ERROR_SUCCESS {
return nil, newPdhError(ret)
}
buf := make([]uint16, size/2)
ret, _, _ = syscall.Syscall6(pdhParseCounterPath, 4, ptrPath, uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&size)), 0, 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return nil, newPdhError(ret)
}
return LP_PDH_COUNTER_PATH_ELEMENTS(unsafe.Pointer(&buf[0])), nil
}
func PdhMakeCounterPath(elements *PDH_COUNTER_PATH_ELEMENTS) (path string, err error) {
size := uint32(PDH_MAX_COUNTER_NAME)
buf := make([]uint16, size)
ret, _, _ := syscall.Syscall6(pdhMakeCounterPath, 4, uintptr(unsafe.Pointer(elements)),
uintptr(unsafe.Pointer(&buf[0])), uintptr(unsafe.Pointer(&size)), 0, 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return "", newPdhError(ret)
}
return windows.UTF16ToString(buf), nil
}
func PdhLookupPerfNameByIndex(index int) (path string, err error) {
size := uint32(PDH_MAX_COUNTER_NAME)
buf := make([]uint16, size)
ret, _, _ := syscall.Syscall6(pdhLookupPerfNameByIndex, 4, 0, uintptr(index), uintptr(unsafe.Pointer(&buf[0])),
uintptr(unsafe.Pointer(&size)), 0, 0)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return "", newPdhError(ret)
}
return windows.UTF16ToString(buf), nil
}
func PdhLookupPerfIndexByName(name string) (idx int, err error) {
nameUTF16, err := syscall.UTF16PtrFromString(name)
if err != nil {
return 0, err
}
ret, _, _ := syscall.Syscall(pdhLookupPerfIndexByName, 3, 0, uintptr(unsafe.Pointer(nameUTF16)), uintptr(unsafe.Pointer(&idx)))
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return 0, newPdhError(ret)
}
return idx, nil
}
func PdhEnumObjectItems(objectName string) (instances []Instance, err error) {
var counterListSize, instanceListSize uint32
nameUTF16, err := syscall.UTF16FromString(objectName)
if err != nil {
return nil, err
}
ptrNameUTF16 := uintptr(unsafe.Pointer(&nameUTF16[0]))
ret, _, _ := syscall.Syscall9(pdhEnumObjectItems, 9, 0, 0,
ptrNameUTF16, 0, uintptr(unsafe.Pointer(&counterListSize)), 0,
uintptr(unsafe.Pointer(&instanceListSize)), uintptr(PERF_DETAIL_WIZARD), 0)
if ret != PDH_MORE_DATA {
if syscall.Errno(ret) == windows.ERROR_SUCCESS {
return
}
return nil, newPdhError(ret)
}
var instptr uintptr
var instbuf []uint16
if counterListSize < 1 {
return nil, fmt.Errorf("No counters found for given object.")
}
counterbuf := make([]uint16, counterListSize)
for {
if instanceListSize == 0 {
return nil, fmt.Errorf("Object does not support variable instances.")
}
instbuf = make([]uint16, instanceListSize)
instptr = uintptr(unsafe.Pointer(&instbuf[0]))
ret, _, _ = syscall.Syscall9(pdhEnumObjectItems, 9, 0, 0, ptrNameUTF16, uintptr(unsafe.Pointer(&counterbuf[0])),
uintptr(unsafe.Pointer(&counterListSize)), instptr, uintptr(unsafe.Pointer(&instanceListSize)),
uintptr(PERF_DETAIL_WIZARD), 0)
if ret == PDH_MORE_DATA {
continue
}
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return nil, newPdhError(ret)
}
break
}
var singleName []uint16
m := make(map[string]bool)
for len(instbuf) != 0 {
singleName, instbuf = NextField(instbuf)
if len(singleName) == 0 {
break
}
strName := windows.UTF16ToString(singleName)
if _, ok := m[strName]; !ok {
m[strName] = true
instances = append(instances, Instance{strName})
}
}
return instances, nil
}
func PdhEnumObject() (objects []string, err error) {
var objectListSize uint32
ret, _, _ := syscall.Syscall6(pdhEnumObjects, 6, 0, 0, 0, uintptr(unsafe.Pointer(&objectListSize)),
uintptr(PERF_DETAIL_WIZARD), bool2uintptr(true))
if ret != PDH_MORE_DATA {
return nil, newPdhError(ret)
}
if objectListSize < 1 {
return nil, fmt.Errorf("No objects found.")
}
objectBuf := make([]uint16, objectListSize)
ret, _, _ = syscall.Syscall6(pdhEnumObjects, 6, 0, 0, uintptr(unsafe.Pointer(&objectBuf[0])),
uintptr(unsafe.Pointer(&objectListSize)), uintptr(PERF_DETAIL_WIZARD),
bool2uintptr(false))
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
return nil, newPdhError(ret)
}
var singleName []uint16
for len(objectBuf) != 0 {
singleName, objectBuf = NextField(objectBuf)
if len(singleName) == 0 {
break
}
objects = append(objects, windows.UTF16ToString(singleName))
}
return objects, nil
}
func getCounterValueDouble(counter PDH_HCOUNTER) (*float64, error) {
var pdhValue PDH_FMT_COUNTERVALUE_DOUBLE
ret, _, _ := syscall.SyscallN(
pdhGetFormattedCounterValue,
uintptr(counter),
uintptr(PDH_FMT_DOUBLE|PDH_FMT_NOCAP100),
0,
uintptr(unsafe.Pointer(&pdhValue)),
)
if syscall.Errno(ret) != windows.ERROR_SUCCESS {
if ret == PDH_INVALID_DATA || ret == PDH_CSTATUS_INVALID_DATA {
return nil, nil
}
return nil, newPdhError(ret)
}
return &pdhValue.Value, nil
}
func newPdhError(ret uintptr) (err error) {
flags := uint32(windows.FORMAT_MESSAGE_FROM_HMODULE | windows.FORMAT_MESSAGE_IGNORE_INSERTS)
var len uint32
buf := make([]uint16, 1024)
len, err = windows.FormatMessage(flags, uintptr(hPdh), uint32(ret), 0, buf, nil)
if len == 0 {
return
}
return errors.New(windows.UTF16ToString(buf))
}