get list of computer names on network [duplicate] - c#

I was wondering if there is a way to get all the computer names that show up in my network places using C#.

You will want to use the NetServerEnum() API. I dont believe there is a managed wrapper for this in the base .NET libraries but I was able to find this with a quick google search: http://www.codeproject.com/Articles/16113/Retreiving-a-list-of-network-computer-names-using
NOTE: I haven't tested or thoroughly reviewed the codeproject code but it should be enough of a starting point for what you need if there are any issues.
EDIT: Do not use DirectoryServices unless your sure of a domain environment. The System.DirectoryServices class is an ADSI wrapper that dosent work without an Active Directory to query against. NetServerEnum() works on workgroups and domains but dosen't guarantee the most reliable data (not all machines may show up). It relies on the Computer Browser service.
The best solution would probably be a class that wraps both possibilities and merges the results :/

This works, but it takes a while. :/
public List<String> ListNetworkComputers()
{
List<String> _ComputerNames = new List<String>();
String _ComputerSchema = "Computer";
System.DirectoryServices.DirectoryEntry _WinNTDirectoryEntries = new System.DirectoryServices.DirectoryEntry("WinNT:");
foreach (System.DirectoryServices.DirectoryEntry _AvailDomains in _WinNTDirectoryEntries.Children) {
foreach (System.DirectoryServices.DirectoryEntry _PCNameEntry in _AvailDomains.Children) {
if (_PCNameEntry.SchemaClassName.ToLower().Contains(_ComputerSchema.ToLower())) {
_ComputerNames.Add(_PCNameEntry.Name);
}
}
}
return _ComputerNames;
}

Depends on the user's permission, the application may or may not get those information.
Try using ActiveDirectory. This should get you precise information about the local network.
Use System.DirectoryServices.

Related

Directory exists is producing inconsistant results on desktop vs server

I have a C# program which checks if a specific directory exists.
It is simply doing:
Directory.Exists(path).
I tried other ways as well. Using DirectoryInfo and using AlphaFS
On my local machine, the path exists. When I run the same program on a server with the same credentials it doesn't exist.
I wonder if it is a group policy issue. But I am able to go up one level and see it.
\server\volume\share\sub directory - Doesn't exist remotely but on my desktop it does
\server\volume\share - Does exist both on my desktop and remote server
Update
I forgot to mention, that since I had access to my desktop, I got the ACL information.
None of the groups were able to translate.
I really just want to get this application to behave the same way is on the server and find out why it is behaving differently.
Update 2
These are physical servers.
My desktop is Liquid VDI
Below is the code:
var path = txtPath.Text;
using (var user = new Impersonation(fuserdomain, fc_user, fc_pass))
{
var alphaExists = Alphaleonis.Win32.Filesystem.Directory.Exists(path);
var alphaDIExists = new Alphaleonis.Win32.Filesystem.DirectoryInfo(path).Exists;
var SystemExists = System.IO.Directory.Exists(path);
var SystemDIExists = new System.IO.DirectoryInfo(path).Exists;
var AlphaHasFiles = false;
var AlphaDIHasFiles = false;
var SystemHasFiles = false;
var SystemDIHasFiles = false;
try
{
Directory.GetFiles(path);
AlphaHasFiles = true;
}
catch { }
try
{
new DirectoryInfo(path).GetFiles();
AlphaDIHasFiles = true;
}
catch { }
try
{
System.IO.Directory.GetFiles(path);
SystemHasFiles = true;
}
catch { }
try
{
new System.IO.DirectoryInfo(path).GetFiles();
SystemDIHasFiles = true;
}
catch { }
MessageBox.Show(string.Format("alphaExists: {0}\nalphaDIExists: {1}\nSystemExists: {2}\nSystemDIExists: {3}\nAlphaGetFiles: {4}\nAlphaDIGetFiles: {5}\nSystemGetFiles: {6}\nSystemDIGetFiles: {7}\n", alphaExists, alphaDIExists, SystemExists, SystemDIExists, AlphaHasFiles, AlphaDIHasFiles, SystemHasFiles, SystemDIHasFiles));
}
Update 3
Although I have workaround this issue; I am still not sure why I would have a difference between my desktop and server. Is there any tool that can help me see where the issue may be?
I've seen the same thing with File.Exists. I never found an answer and finally threw in the towel, I simply try to use it and catch the exception.
Robust code has to catch it anyway, all the test does is avoid trying if the file or directory is not there. (And the PITA that Visual Studio no longer as any way to ignore an exception on a certain line. No problem runtime, annoying in development.)
This is a complete shot in the dark, since we don't have any specific details to go on. e.g. Is the server you're talking about physically yours, or is it a cloud-based server service?
I'd guess that your machine is an older operating system than the server, and the folder that you're trying to access is one of those special folders that has become more locked down with more recent operating systems (particularly on server operating systems) like the "Program Files" folder. So even though the folder exists on both, the method works on your machine but not on the server, due to permissions.
Hope this helps.
As far as I can tell, the Impersonation class in your code is not part of the dot net framework. Googling finds a couple of implementations. Where does it come from and How confident are you that it actually works in your scenario?
For example, if you remove the Impersonation code, and actually run it as that user, does that make it work?
One other clarification... When you say
\server\volume\share
Do you mean this is a network location (e.g. a UNC location), so is the same network path you are trying to access from both machines? If so, this would open up new possibilities for problems like firewalls, etc... Is that location on either of the two machines that we know about from the question, or a different location?

Query for retrieving account associated with ServicePrincipleName(SPN)

We have an internal site which was built on C# and has various tools for various functions to help the company like looking up/modifying/adding service accounts, for example. The tools are just C# code to automate these tasks. /vague
I've been asked to find/create a way to enter an SPN and have it return the service account which it's associated to.
So something like:
Input: HTTP/server1.company.com
Output: SVC_ACCT_AWESOME
The other request I got was for entering a service account name and have it give the KVNO back.
Issue, I have never done anything in C# before. I have Visual Studio 2013 loaded and I want to learn. I've spent hours pouring over the Googles and haven't found anything useful other than this:
https://msdn.microsoft.com/en-us/library/vstudio/system.servicemodel.configuration.identityelement.serviceprincipalname(v=vs.100).aspx
Unfortunately it doesn't mean anything to me.
Any direction that can be given for these specific tasks would be super appreciated!
Thanks.
I believe you can query AD for SPNs with something like this:
using (var root = new DirectoryEntry()) // or pass in something like "LDAP://dc=example,dc=com" to query a different domain
using (var searcher = new DirectorySearcher(root))
{
searcher.Filter = "(servicePrincipalName=HTTP/server1.company.com)";
using (var results = searcher.FindAll())
{
foreach (SearchResult result in results)
Console.WriteLine(result.Properties["samAccountName"][0]); // or whatever you want to do with it
}
}
(this needs a reference to System.DirectoryServices)

Getting computer names from my network places

I was wondering if there is a way to get all the computer names that show up in my network places using C#.
You will want to use the NetServerEnum() API. I dont believe there is a managed wrapper for this in the base .NET libraries but I was able to find this with a quick google search: http://www.codeproject.com/Articles/16113/Retreiving-a-list-of-network-computer-names-using
NOTE: I haven't tested or thoroughly reviewed the codeproject code but it should be enough of a starting point for what you need if there are any issues.
EDIT: Do not use DirectoryServices unless your sure of a domain environment. The System.DirectoryServices class is an ADSI wrapper that dosent work without an Active Directory to query against. NetServerEnum() works on workgroups and domains but dosen't guarantee the most reliable data (not all machines may show up). It relies on the Computer Browser service.
The best solution would probably be a class that wraps both possibilities and merges the results :/
This works, but it takes a while. :/
public List<String> ListNetworkComputers()
{
List<String> _ComputerNames = new List<String>();
String _ComputerSchema = "Computer";
System.DirectoryServices.DirectoryEntry _WinNTDirectoryEntries = new System.DirectoryServices.DirectoryEntry("WinNT:");
foreach (System.DirectoryServices.DirectoryEntry _AvailDomains in _WinNTDirectoryEntries.Children) {
foreach (System.DirectoryServices.DirectoryEntry _PCNameEntry in _AvailDomains.Children) {
if (_PCNameEntry.SchemaClassName.ToLower().Contains(_ComputerSchema.ToLower())) {
_ComputerNames.Add(_PCNameEntry.Name);
}
}
}
return _ComputerNames;
}
Depends on the user's permission, the application may or may not get those information.
Try using ActiveDirectory. This should get you precise information about the local network.
Use System.DirectoryServices.

vmware .net api help vmware.vim.dll problems

Vmware's .net api reference is somewhat confusing and hard to follow. I have been able to connect to my vcenter host then get a list of esxi hosts. Then I have been able get all the running modules on the host using HostKernelModuleSystem, and probe the properties on the variable "mod"... but I am not able to figure out how to get license info, I tried creating an object lic below, trying all different kinds of "types" from vmware with the word license in the type. but, it never works it has a problem converting the line with LicenseManagerLicenseInfo lic = .... I always get the following:
"Cannot convert type 'Vmware.Vim.Viewbase' to
'Vmware.Vim.LicenseManagerLicenseInfo'"
but the declaration above it for "mod" works fine.
I have also tried:
HostLicenseConnectInfo
LicenseAssignmentManagerLicenseAssignment
LicenseManager
I am hoping someone who has worked with vmware .net api can shed some light on what i am doing wrong? I am new to C# about 1 year :) but these VMware APIs are somewhat confusing to me.
esxList = client.FindEntityViews(typeof(HostSystem), null, null, null);
foreach (HostSystem host in esxList)
{
HostKernelModuleSystem mod = (HostKernelModuleSystem)client.GetView(host.ConfigManager.KernelModuleSystem, null);
LicenseManagerLicenseInfo lic = (LicenseManagerLicenseInfo)client.GetView(host.ConfigManager.LicenseManager, null);
string name = lic.Name;
}
I'll have to go to work tomorrow to look at this ( don't have ESX and VMWare SDK for .NET at home ) but I've done a bit of this work.
I wrote a generics method that wraps FindEntityViews and takes a filter as an argument. That makes it easy to search for anything. Also I've noticed that searches come back as ManagedObjectReferences and can't be cast to the subclasses. You have to construct them passing the ManagedObjectReference as an argument.
Also I find searching for PowerCLI examples and watching the classes in the immeadiate window very help in navigating this API. It's a fairly decent SDK but they put all of the classes in a single namespace and there's lots of little style inconsistencies ( Device instead of Devices and properties that take strings instead of enums when an enum exists ).
i figured out how to do it :) , by using http://vcenter_hostname/mob I was able to walk through api better. here is what I did, plus instead of of using "host" which was type HostSystem I jused my instance of my vCenter host "client"
VMware.Vim.LicenseManager lic_manager = (VMware.Vim.LicenseManager)client.GetView(client.ServiceContent.LicenseManager, null);
LicenseManagerLicenseInfo[] lic_found = lic_manager.Licenses;
foreach (LicenseManagerLicenseInfo lic in lic_found)
{
string test = lic.Name.ToString();
string test2 = lic.LicenseKey.ToString();
}

P4.NET - How to list user's workspaces?

I am not an expert in P4.NET plugin, but I would like to show the existing workspaces for a user in a combo box, so that I can set the p4.Client to the selected workspace.
using (var p4 = new P4Connection())
{
p4.Connect();
???
}
How do I get the list of existing workspaces?
I think the command line to achieve this would be
p4 clients -m 100 -u username
If P4.Net behaves similar to the official Perforce APIs, then you would likely want to run:
p4.Run("clients", "-m 100 -u username")
or similar. Inspired by the P4Ruby documentation.
Ok I have no choice than answering my own question, because the code would be too much to insert as comments to jhwist answer. Sorry jhwist. I had no choice.
#appinger, I hope you find this answer helpful. Took me hours to figure out this api working. :)
cmbBoxPerforceWorkspaceLocation is just your combobox for your workspaces. I am using Winforms by the way.
I need to extract a shortname from the windows username. Windows username starts usually with xxxx\\username. In my code I extract the username out of the longname and save it as shortname. If your network is set differently this code might have to change accordingly.
Let me know if it worked for you.
using (var p4 = new P4Connection())
{
p4.Connect();
var longName = WindowsIdentity.GetCurrent().Name;
var shortname = longName.Substring(longName.IndexOf("\\") + 1);
var records = p4.Run("clients", "-u", shortname);
cmbBoxPerforceWorkspaceLocation.Items.Clear();
foreach (P4Record record in records.Records)
{
cmbBoxPerforceWorkspaceLocation.Items.Add(record["client"]);
}
}
P4.Net is designed to be similar to the scripting APIs, which in turn are designed around the command line interface. It definitely does not have a intuitive object-oriented interface... which is off putting at first. But if you start from the command-line (esp -ztag flag) and piece together all data/actions your app needs, you will find it pretty easy to use P4.Net. And since it's similar to all the scripting APIs, you'll find it natural to pickup Python or Ruby if you wish :-)

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