NTP Analyzer  0.8.2
Analyze the operation of time servers
Permission.cs
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1 //
2 // Copyright (c) 2013-2017 Carsten Sonne Larsen <cs@innolan.net>
3 //
4 // Permission is hereby granted, free of charge, to any person obtaining a copy
5 // of this software and associated documentation files (the "Software"), to deal
6 // in the Software without restriction, including without limitation the rights
7 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 // copies of the Software, and to permit persons to whom the Software is
9 // furnished to do so, subject to the following conditions:
10 //
11 // The above copyright notice and this permission notice shall be included in
12 // all copies or substantial portions of the Software.
13 //
14 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
20 // THE SOFTWARE.
21 
22 using System;
23 using Mono.Unix.Native;
24 
25 namespace Ntp.Common.IO
26 {
27  public static class Permission
28  {
29  public static bool ChangeFileMode(string file, uint mode)
30  {
31  // Changing file mode is only supported on Unix platforms
32  if (Environment.OSVersion.Platform != PlatformID.Unix)
33  return true;
34 
35  var permissions = NativeConvert.FromOctalPermissionString(mode.ToString());
36  return Syscall.chmod(file, permissions) == 0;
37  }
38 
39  public static bool ChangeFileOwner(string file, uint user, uint? group)
40  {
41  // Changing file owner is only supported on Unix platforms
42  if (Environment.OSVersion.Platform != PlatformID.Unix)
43  return true;
44 
45  return Syscall.chown(file, user, group ?? unchecked((uint) -1)) == 0;
46  }
47 
48  public static uint? GetGroupId(string groupName)
49  {
50  // Group IDs are only supported on Unix platforms
51  if (Environment.OSVersion.Platform != PlatformID.Unix)
52  return 0;
53 
54  var gr = Syscall.getgrnam(groupName);
55  return gr?.gr_gid;
56  }
57 
58  public static uint? GetUserId(string userName)
59  {
60  // User IDs are only supported on Unix platforms
61  if (Environment.OSVersion.Platform != PlatformID.Unix)
62  return 0;
63 
64  var pw = Syscall.getpwnam(userName);
65  return pw?.pw_uid;
66  }
67 
68  public static bool SetUserId(uint userId)
69  {
70  // Setting user ID is only supported on Unix platforms
71  if (Environment.OSVersion.Platform != PlatformID.Unix)
72  return true;
73 
74  try
75  {
76  Syscall.setuid(userId);
77  }
78  catch
79  {
80  return false;
81  }
82 
83  return true;
84  }
85  }
86 }
static uint GetGroupId(string groupName)
Definition: Permission.cs:48
static bool ChangeFileMode(string file, uint mode)
Definition: Permission.cs:29
static uint GetUserId(string userName)
Definition: Permission.cs:58
static bool SetUserId(uint userId)
Definition: Permission.cs:68
static bool ChangeFileOwner(string file, uint user, uint?group)
Definition: Permission.cs:39