class/System/System.Diagnostics/EventLogImpl.cs

   1 //
   2 // System.Diagnostics.EventLogImpl.cs
   3 //
   4 // Authors:
   5 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   6 //   Atsushi Enomoto  <atsushi@ximian.com>
   7 //   Gert Driesen (drieseng@users.sourceforge.net)
   8 //
   9 // (C) 2003 Andreas Nahr
  10 // (C) 2006 Novell, Inc.
  11 //
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System;
  34 using System.ComponentModel;
  35 using System.ComponentModel.Design;
  36 using System.Diagnostics;
  37 using System.Globalization;
  38
  39 using Microsoft.Win32;
  40
  41 namespace System.Diagnostics
  42 {
  43         internal abstract class EventLogImpl
  44         {
  45                 readonly EventLog _coreEventLog;
  46
  47                 protected EventLogImpl (EventLog coreEventLog)
  48                 {
  49                         _coreEventLog = coreEventLog;
  50                 }
  51
  52                 protected EventLog CoreEventLog {
  53                         get { return _coreEventLog; }
  54                 }
  55
  56                 public int EntryCount {
  57                         get {
  58                                 if (_coreEventLog.Log == null || _coreEventLog.Log.Length == 0) {
  59                                         throw new ArgumentException ("Log property is not set.");
  60                                 }
  61
  62                                 if (!EventLog.Exists (_coreEventLog.Log, _coreEventLog.MachineName)) {
  63                                         throw new InvalidOperationException (string.Format (
  64                                                 CultureInfo.InvariantCulture, "The event log '{0}' on "
  65                                                 + " computer '{1}' does not exist.", _coreEventLog.Log,
  66                                                 _coreEventLog.MachineName));
  67                                 }
  68
  69                                 return GetEntryCount ();
  70                         }
  71                 }
  72
  73                 public EventLogEntry this[int index] {
  74                         get {
  75                                 if (_coreEventLog.Log == null || _coreEventLog.Log.Length == 0) {
  76                                         throw new ArgumentException ("Log property is not set.");
  77                                 }
  78
  79                                 if (!EventLog.Exists (_coreEventLog.Log, _coreEventLog.MachineName)) {
  80                                         throw new InvalidOperationException (string.Format (
  81                                                 CultureInfo.InvariantCulture, "The event log '{0}' on "
  82                                                 + " computer '{1}' does not exist.", _coreEventLog.Log,
  83                                                 _coreEventLog.MachineName));
  84                                 }
  85
  86                                 if (index < 0 || index >= EntryCount)
  87                                         throw new ArgumentException ("Index out of range");
  88
  89                                 return GetEntry (index);
  90                         }
  91                 }
  92
  93                 public string LogDisplayName {
  94                         get {
  95 #if NET_2_0
  96                                 // to-do perform valid character checks
  97                                 if (_coreEventLog.Log != null && _coreEventLog.Log.Length == 0) {
  98                                         throw new InvalidOperationException ("Event log names must"
  99                                                 + " consist of printable characters and cannot contain"
 100                                                 + " \\, *, ?, or spaces.");
 101                                 }
 102 #endif
 103                                 if (_coreEventLog.Log != null) {
 104                                         if (_coreEventLog.Log.Length == 0)
 105                                                 return string.Empty;
 106
 107                                         if (!EventLog.Exists (_coreEventLog.Log, _coreEventLog.MachineName)) {
 108                                                 throw new InvalidOperationException (string.Format (
 109                                                         CultureInfo.InvariantCulture, "Cannot find Log {0}"
 110                                                         + " on computer {1}.", _coreEventLog.Log,
 111                                                         _coreEventLog.MachineName));
 112                                         }
 113                                 }
 114
 115                                 return GetLogDisplayName ();
 116                         }
 117                 }
 118
 119                 public EventLogEntry [] GetEntries ()
 120                 {
 121                         string logName = CoreEventLog.Log;
 122                         if (logName == null || logName.Length == 0)
 123                                 throw new ArgumentException ("Log property value has not been specified.");
 124
 125                         if (!EventLog.Exists (logName))
 126                                 throw new InvalidOperationException (string.Format (
 127                                         CultureInfo.InvariantCulture, "The event log '{0}' on "
 128                                         + " computer '{1}' does not exist.", logName,
 129                                         _coreEventLog.MachineName));
 130
 131                         int entryCount = GetEntryCount ();
 132                         EventLogEntry [] entries = new EventLogEntry [entryCount];
 133                         for (int i = 0; i < entryCount; i++) {
 134                                 entries [i] = GetEntry (i);
 135                         }
 136                         return entries;
 137                 }
 138
 139                 public abstract void DisableNotification ();
 140
 141                 public abstract void EnableNotification ();
 142
 143                 public abstract void BeginInit ();
 144
 145                 public abstract void Clear ();
 146
 147                 public abstract void Close ();
 148
 149                 public abstract void CreateEventSource (EventSourceCreationData sourceData);
 150
 151                 public abstract void Delete (string logName, string machineName);
 152
 153                 public abstract void DeleteEventSource (string source, string machineName);
 154
 155                 public abstract void Dispose (bool disposing);
 156
 157                 public abstract void EndInit ();
 158
 159                 public abstract bool Exists (string logName, string machineName);
 160
 161                 protected abstract int GetEntryCount ();
 162
 163                 protected abstract EventLogEntry GetEntry (int index);
 164
 165                 public EventLog [] GetEventLogs (string machineName)
 166                 {
 167                         string [] logNames = GetLogNames (machineName);
 168                         EventLog [] eventLogs = new EventLog [logNames.Length];
 169                         for (int i = 0; i < logNames.Length; i++) {
 170                                 EventLog eventLog = new EventLog (logNames [i], machineName);
 171                                 eventLogs [i] = eventLog;
 172                         }
 173                         return eventLogs;
 174                 }
 175
 176                 protected abstract string GetLogDisplayName ();
 177
 178                 public abstract string LogNameFromSourceName (string source, string machineName);
 179
 180                 public abstract bool SourceExists (string source, string machineName);
 181
 182                 public abstract void WriteEntry (string [] replacementStrings, EventLogEntryType type, uint instanceID, short category, byte[] rawData);
 183
 184                 protected abstract string FormatMessage (string source, uint messageID, string [] replacementStrings);
 185
 186                 protected abstract string [] GetLogNames (string machineName);
 187
 188                 protected void ValidateCustomerLogName (string logName, string machineName)
 189                 {
 190                         if (logName.Length >= 8) {
 191                                 string significantName = logName.Substring (0, 8);
 192                                 if (string.Compare (significantName, "AppEvent", true) == 0 || string.Compare (significantName, "SysEvent", true) == 0 || string.Compare (significantName, "SecEvent", true) == 0)
 193                                         throw new ArgumentException (string.Format (
 194                                                 CultureInfo.InvariantCulture, "The log name: '{0}' is"
 195                                                 + " invalid for customer log creation.", logName));
 196
 197                                 // the first 8 characters of the log name are used as  filename
 198                                 // for .evt file and as such no two logs with 8 characters or
 199                                 // more should have the same first 8 characters (or the .evt
 200                                 // would be overwritten)
 201                                 //
 202                                 // this check is not strictly necessary on unix
 203                                 string [] logs = GetLogNames (machineName);
 204                                 for (int i = 0; i < logs.Length; i++) {
 205                                         string log = logs [i];
 206                                         if (log.Length >= 8 && string.Compare (log, 0, significantName, 0, 8, true) == 0)
 207                                                 throw new ArgumentException (string.Format (
 208                                                         CultureInfo.InvariantCulture, "Only the first eight"
 209                                                         + " characters of a custom log name are significant,"
 210                                                         + " and there is already another log on the system"
 211                                                         + " using the first eight characters of the name given."
 212                                                         + " Name given: '{0}', name of existing log: '{1}'.",
 213                                                         logName, log));
 214                                 }
 215                         }
 216
 217                         // LAMESPEC: check if the log name matches an existing source
 218                         // https://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=186552
 219                         if (SourceExists (logName, machineName)) {
 220                                 if (machineName == ".")
 221                                         throw new ArgumentException (string.Format (
 222                                                 CultureInfo.InvariantCulture, "Log {0} has already been"
 223                                                 + " registered as a source on the local computer.",
 224                                                 logName));
 225                                 else
 226                                         throw new ArgumentException (string.Format (
 227                                                 CultureInfo.InvariantCulture, "Log {0} has already been"
 228                                                 + " registered as a source on the computer {1}.",
 229                                                 logName, machineName));
 230                         }
 231                 }
 232
 233 #if NET_2_0
 234                 public abstract OverflowAction OverflowAction { get; }
 235
 236                 public abstract int MinimumRetentionDays { get; }
 237
 238                 public abstract long MaximumKilobytes { get; set; }
 239
 240                 public abstract void ModifyOverflowPolicy (OverflowAction action, int retentionDays);
 241
 242                 public abstract void RegisterDisplayName (string resourceFile, long resourceId);
 243 #endif
 244         }
 245 }