当计算机不在活动目录中时,如何获取本地计算机组/用户列表? [英] How to get a list of local machine groups / users when machine is not in active directory?
问题描述
当Windows计算机不是AD成员并且无法使用LDAP搜索时,是否可以通过C#获取本地组和用户列表?
Is there a way to get in C# a list of local groups and users, when the windows machine is no AD member and an LDAP search can't be used?
推荐答案
您可以使用P / Invoke调用本地网络管理API 来获取本地用户名和组名:
You can use P/Invoke to call the native network management API to get local user and group names:
static class NativeMethods {
[DllImport("netapi32.dll")]
public static extern void NetApiBufferFree(IntPtr bufptr);
[DllImport("netapi32.dll")]
public static extern UInt32 NetUserEnum([MarshalAs(UnmanagedType.LPWStr)] String servername, UInt32 level, UInt32 filter, ref IntPtr bufptr, UInt32 prefmaxlen, ref UInt32 entriesread, ref UInt32 totalentries, IntPtr resumehandle);
[DllImport("netapi32.dll")]
public static extern UInt32 NetLocalGroupEnum([MarshalAs(UnmanagedType.LPWStr)] String servername, UInt32 level, ref IntPtr bufptr, UInt32 prefmaxlen, ref UInt32 entriesread, ref UInt32 totalentries, IntPtr resumehandle);
[DllImport("Netapi32.dll")]
public extern static UInt32 NetLocalGroupGetMembers([MarshalAs(UnmanagedType.LPWStr)] String servername, [MarshalAs(UnmanagedType.LPWStr)] String localgroupname, UInt32 level, ref IntPtr bufptr, UInt32 prefmaxlen, ref UInt32 entriesread, ref UInt32 totalentries, IntPtr resumehandle);
}
API可让您获取有关用户的各种信息。如果只希望使用名称,则可以使用以下功能:
The API allows you to get various information about users. If you only want names you can use this function:
IEnumerable<String> GetUserNames() {
var buffer = IntPtr.Zero;
try {
UInt32 entriesRead = 0;
UInt32 totalEntries = 0;
var result = NativeMethods.NetUserEnum(null, 0, 0, ref buffer, UInt32.MaxValue, ref entriesRead, ref totalEntries, IntPtr.Zero);
if (result != 0)
throw new Win32Exception((Int32) result);
var userNames = Enumerable
.Range(0, (Int32) entriesRead)
.Select(
i => {
var userInfo = Marshal.ReadIntPtr(buffer, i*IntPtr.Size);
var userName = Marshal.PtrToStringAuto(userInfo);
return userName;
}
)
.ToList();
return userNames;
}
finally {
NativeMethods.NetApiBufferFree(buffer);
}
}
LINQ语句用于解析缓冲区包含 USER_INFO_0
结构。如果您要查询其他信息,则必须做更多详细的解析。
The LINQ statement is used to "parse" the buffer that contains USER_INFO_0
strutures. If you are querying for additional information you will have to do more elaborate "parsing".
同样,您可以获得本地组名:
Likewise you can get local group names:
IEnumerable<String> GetLocalGroupNames() {
var buffer = IntPtr.Zero;
try {
UInt32 entriesRead = 0;
UInt32 totalEntries = 0;
var result = NativeMethods.NetLocalGroupEnum(null, 0, ref buffer, UInt32.MaxValue, ref entriesRead, ref totalEntries, IntPtr.Zero);
if (result != 0)
throw new Win32Exception((Int32) result);
var localGroupNames = Enumerable
.Range(0, (Int32) entriesRead)
.Select(
i => {
var localGroupInfo = Marshal.ReadIntPtr(buffer, i*IntPtr.Size);
var groupName = Marshal.PtrToStringAuto(localGroupInfo);
return groupName;
}
)
.ToList();
return localGroupNames;
}
finally {
NativeMethods.NetApiBufferFree(buffer);
}
}
缓冲区中的结构为 LOCALGROUP_INFO_0
具有与 USER_INFO_0
结构相同的布局,因此解析代码相同。
The structures in the buffer are LOCALGROUP_INFO_0
with the same layout as the USER_INFO_0
structure so the "parsing" code is identical.
最后,这是如何使用 LOCALGROUP_MEMBERS_INFO_3
结构:
Finally, here is how to get group membership using the LOCALGROUP_MEMBERS_INFO_3
structure:
IEnumerable<String> GetLocalGroupUsers(String localGroupName) {
var buffer = IntPtr.Zero;
try {
UInt32 entriesRead = 0;
UInt32 totalEntries = 0;
var result = NativeMethods.NetLocalGroupGetMembers(null, localGroupName, 3, ref buffer, UInt32.MaxValue, ref entriesRead, ref totalEntries, IntPtr.Zero);
if (result != 0)
throw new Win32Exception((Int32) result);
var userNames = Enumerable
.Range(0, (Int32) entriesRead)
.Select(
i => {
var membersInfo = Marshal.ReadIntPtr(buffer, i*IntPtr.Size);
var userName = Marshal.PtrToStringAuto(membersInfo );
return userName;
}
)
.ToList();
return userNames;
}
finally {
NativeMethods.NetApiBufferFree(buffer);
}
}
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