345 lines
6.6 KiB
Go
345 lines
6.6 KiB
Go
package logging
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import (
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"errors"
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"fmt"
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"os"
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"os/exec"
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"syscall"
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"golang.org/x/sys/windows/registry"
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"golang.org/x/sys/windows/svc/eventlog"
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"r00t2.io/sysutils/paths"
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)
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/*
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Setup sets up/configures a WinLogger and prepares it for use.
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This will fail with an Access Denied (the first time, at least) unless running with elevated permissions unless WinLogger.Prefix is
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a registered Event Log source.
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If a failure occurs while trying to open the log with the given WinLogger.Prefix ("source"), a new Event Log source will be registered.
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If WinLogger.Executable is not empty at the time of calling WinLogger.Setup (or WinLogger.ForceService is true),
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eventlog.Install will be used (with the WinLogger.ExpandKey field).
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Otherwise eventlog.InstallAsEventCreate will be used.
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*/
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func (l *WinLogger) Setup() (err error) {
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/*
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A sanity check on the EventIDs.
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Since we use eventcreate, all Event IDs must be 1 <= eid <= 1000.
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*/
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for _, eid := range []uint32{
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l.EIDs.Alert,
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l.EIDs.Crit,
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l.EIDs.Debug,
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l.EIDs.Emerg,
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l.EIDs.Err,
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l.EIDs.Info,
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l.EIDs.Notice,
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l.EIDs.Warning,
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} {
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if !((eid <= EIDMax) && (EIDMin <= eid)) {
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err = ErrBadEid
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return
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}
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}
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if err = l.Install(); err != nil {
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return
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}
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if l.elog, err = eventlog.Open(l.Prefix); err != nil {
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return
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}
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return
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}
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// Install installs/registers the WinLogger Event Log interface. You most likely do not need to run this directly.
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func (l *WinLogger) Install() (err error) {
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var exists bool
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var doNotCreate bool
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var useEventCreate bool = true
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if doNotCreate, err = l.Exists(); err != nil {
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return
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} else if !doNotCreate {
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if l.Executable != "" {
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if l.Executable, err = exec.LookPath(l.Executable); err != nil {
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return
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}
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useEventCreate = false
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} else if l.ForceService {
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if l.Executable, err = exec.LookPath(os.Args[0]); err != nil {
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return
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}
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useEventCreate = false
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}
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if !useEventCreate {
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if exists, err = paths.RealPathExists(&l.Executable); err != nil {
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return
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} else if !exists {
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err = ErrBadBinPath
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return
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}
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if err = eventlog.Install(l.Prefix, l.Executable, l.ExpandKey, eventlog.Error|eventlog.Warning|eventlog.Info); err != nil {
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return
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}
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} else {
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if err = eventlog.InstallAsEventCreate(l.Prefix, eventlog.Error|eventlog.Warning|eventlog.Info); err != nil {
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return
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}
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}
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}
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return
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}
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// Remove uninstalls a registered WinLogger source.
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func (l *WinLogger) Remove() (err error) {
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if err = eventlog.Remove(l.Prefix); err != nil {
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return
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}
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return
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}
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/*
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Shutdown cleanly shuts down a WinLogger but keep the source registered. Use WinLogger.Remove
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(or set WinLogger.RemoveOnClose to true before calling WinLogger.Shutdown) to remove the registered source.
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*/
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func (l *WinLogger) Shutdown() (err error) {
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if err = l.elog.Close(); err != nil {
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// TODO: check for no access or file not exists syscall errors?
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return
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}
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if l.RemoveOnClose {
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if err = l.Remove(); err != nil {
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return
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}
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}
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return
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}
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/*
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GetPrefix returns the prefix used by this WinLogger.
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err will always be nil; it's there for interface-compat.
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*/
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func (l *WinLogger) GetPrefix() (prefix string, err error) {
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prefix = l.Prefix
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return
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}
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/*
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DoDebug sets the debug state of this WinLogger.
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Note that this merely acts as a *safety filter* for debug messages to avoid sensitive information being written to the log.
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err will always be nil; it's there for interface-compat.
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*/
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func (l *WinLogger) DoDebug(d bool) (err error) {
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l.EnableDebug = d
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return
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}
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// GetDebug returns the debug status of this WinLogger.
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func (l *WinLogger) GetDebug() (d bool) {
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d = l.EnableDebug
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return
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}
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// SetPrefix sets the prefix for this WinLogger.
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func (l *WinLogger) SetPrefix(prefix string) (err error) {
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// To properly change the prefix, we need to tear down the old event log and create a new one.
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if err = l.Shutdown(); err != nil {
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return
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}
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l.Prefix = prefix
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if err = l.Setup(); err != nil {
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return
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}
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return
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}
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// Exists indicates if the WinLogger.Prefix is a registered source or not.
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func (l *WinLogger) Exists() (e bool, err error) {
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var regKey registry.Key
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var subKey registry.Key
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if regKey, err = registry.OpenKey(registry.LOCAL_MACHINE, eventLogRegistryKey, registry.READ); err != nil {
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return
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}
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defer regKey.Close()
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if subKey, err = registry.OpenKey(regKey, l.Prefix, registry.READ); err != nil {
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if errors.Is(err, syscall.ERROR_FILE_NOT_FOUND) {
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e = false
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err = nil
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}
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return
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}
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defer subKey.Close()
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e = true
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return
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}
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// Alert writes an ALERT-level message to this WinLogger.
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func (l *WinLogger) Alert(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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// Treat ALERT as Warning
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err = l.elog.Warning(l.EIDs.Alert, msg)
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return
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}
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// Crit writes an CRITICAL-level message to this WinLogger.
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func (l *WinLogger) Crit(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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// Treat CRIT as Error
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err = l.elog.Error(l.EIDs.Crit, msg)
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return
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}
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// Debug writes a DEBUG-level message to this WinLogger.
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func (l *WinLogger) Debug(s string, v ...interface{}) (err error) {
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if !l.EnableDebug {
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return
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}
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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// Treat DEBUG as Info
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err = l.elog.Info(l.EIDs.Debug, msg)
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return
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}
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// Emerg writes an EMERGENCY-level message to this WinLogger.
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func (l *WinLogger) Emerg(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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// Treat EMERG as Error
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err = l.elog.Error(l.EIDs.Emerg, msg)
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return
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}
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// Err writes an ERROR-level message to this WinLogger.
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func (l *WinLogger) Err(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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err = l.elog.Error(l.EIDs.Err, msg)
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return
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}
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// Info writes an INFO-level message to this WinLogger.
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func (l *WinLogger) Info(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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err = l.elog.Info(l.EIDs.Info, msg)
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return
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}
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// Notice writes a NOTICE-level message to this WinLogger.
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func (l *WinLogger) Notice(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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// Treat NOTICE as Info
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err = l.elog.Info(l.EIDs.Notice, msg)
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return
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}
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// Warning writes a WARNING/WARN-level message to this WinLogger.
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func (l *WinLogger) Warning(s string, v ...interface{}) (err error) {
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var msg string
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if v != nil {
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msg = fmt.Sprintf(s, v...)
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} else {
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msg = s
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}
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err = l.elog.Warning(l.EIDs.Warning, msg)
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return
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}
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