Solved

Small program to get server OS name

Posted on 2011-03-01
10
1,143 Views
Last Modified: 2012-05-11
I got this small C source code and compiled with GCC, in order to get server OS information, using data stored in ServerMessegeBlock (SMB) APIs.

When I call it with no parameters, the code correctily shows OS from current machine:
    "GetOSName.exe      ENTER"

But when a run the utility passing server name, no information is printed:
    "GetOSName.exe   \\MYSERVER    ENTER"

So, what is wrong with this code ?
#ifndef UNICODE
#define UNICODE
#endif
#pragma comment(lib, "netapi32.lib")

#include <stdio.h>
#include <windows.h> 
#include <lm.h>

int main(int argc, wchar_t *argv[])
{
   DWORD dwLevel = 101;
   LPSERVER_INFO_101 pBuf = NULL;
   NET_API_STATUS nStatus;
   LPTSTR pszServerName = NULL;

   if (argc > 2)
   {
      fwprintf(stderr, L"Usage: %s [\\\\ServerName]\n", argv[0]);
      exit(1);
   }

   // The server is not the default local computer.
   //
   if (argc == 2)
      pszServerName = (LPTSTR) argv[1];

   //
   // Call the NetServerGetInfo function, specifying level 101.
   //
   nStatus = NetServerGetInfo(pszServerName,
                              dwLevel,
                              (LPBYTE *)&pBuf);
   //
   // If the call succeeds,
   //
   if (nStatus == NERR_Success)
   {
      //
      // Check for the type of server.
      //

      printf("sv101_type..........: %d\n", pBuf->sv101_type);
      wprintf(L"sv101_name..........: %s\n", pBuf->sv101_name);
      printf("sv101_platform_id...: %d\n", pBuf->sv101_platform_id);
      printf("sv101_version_major.: %d\n", pBuf->sv101_version_major);
      printf("sv101_version_minor.: %d\n", pBuf->sv101_version_minor);
      wprintf(L"sv101_comment.......: %s\n", pBuf->sv101_comment);


      if ((pBuf->sv101_type & SV_TYPE_DOMAIN_CTRL) ||
         (pBuf->sv101_type & SV_TYPE_DOMAIN_BAKCTRL) ||
         (pBuf->sv101_type & SV_TYPE_SERVER_NT))
         printf("This is a server\n");
      else
         printf("This is a workstation\n");
   }
   //
   // Otherwise, print the system error.
   //
   else
      fprintf(stderr, "A system error has occurred: %d\n", nStatus);
   //
   // Free the allocated memory.
   //
   if (pBuf != NULL)
      NetApiBufferFree(pBuf);

   return 0;
}

Open in new window

0
Comment
Question by:MarcosBarroso
  • 3
  • 3
  • 2
  • +1
10 Comments
 
LVL 4

Expert Comment

by:denissie
ID: 35012397
Hi MacrosBarroso,

Could you please add the output of your program when using the server name?
Do you get the ""A system error has occurred" message?

Thanks.
0
 

Author Comment

by:MarcosBarroso
ID: 35016260
If I use  
    "GetOSName.exe   \\MYSERVER    ENTER"     or
    "GetOSName.exe   MYSERVER    ENTER"

Then i get value 53 returned to variable nStatus:  
    " A system error has occurred: 53"

Thanks

Marcos

0
 

Author Comment

by:MarcosBarroso
ID: 35016433
I think my error is in line 26:
     "pszServerName = (LPTSTR) argv[1];"

Maybe wrong cast or string /pointer type, because if I don't pass any parameter, information about current machine is showed ok.

Marcos


0
Three Reasons Why Backup is Strategic

Backup is strategic to your business because your data is strategic to your business. Without backup, your business will fail. This white paper explains why it is vital for you to design and immediately execute a backup strategy to protect 100 percent of your data.

 
LVL 33

Accepted Solution

by:
sarabande earned 500 total points
ID: 35016484
error 53 means "bad network path"

the servername passed to NetServerGetInfo must be LPWSTR ( == wchar_t *)  while LPTSTR can be either LPSTR (==char*) or LPWSTR depending on the defined character set of the project. try to pass L"MYSERVER"  to check that issue.

Sara
0
 
LVL 16

Expert Comment

by:sjklein42
ID: 35016503
I'll go out on a limb and make a fool of myself, but doesn't function main have char *argv, not wchar_t:

int main(int argc, char *argv[])

Open in new window

0
 
LVL 33

Expert Comment

by:sarabande
ID: 35016590
a wizard generated win32 console project in Visual Studio has function

   int _tmain(int argc, LPTSTR argv[]);

as main function where the LPTSTR either is char* or wchar_t*

Sara
0
 
LVL 4

Expert Comment

by:denissie
ID: 35021922
The WinAPI "NetServerGetInfo" uses LPWSTR servername as server name's input.
Therefore, you should use unicode.

As might be seen in MSDn code example (http://msdn.microsoft.com/en-us/library/aa370624%28v=vs.85%29.aspx), use "int wmain(int argc, wchar_t *argv[])".

BTW:Your code looks a lot like that code example. Might it be that you've omitted to copy the "int wmain..." line?
Could you change that and try again?

Thanks.
0
 
LVL 16

Expert Comment

by:sjklein42
ID: 35022135
MarcosBarroso:  Did you try my simple change on the "main" line just to see if it works?

sara:  He's using "main", not "_tmain".  I think it makes a difference. The raw "main" is the same in C and C++:

http://en.wikipedia.org/wiki/Main_function
0
 
LVL 16

Expert Comment

by:sjklein42
ID: 35022662
I knew I'd be the fool in this discussion.   Good going sarabande.
0
 
LVL 33

Expert Comment

by:sarabande
ID: 35024967
sjklein42, i like your humour :-)

you rightly stated that marcosborroso used wrong argument wchar_t* as type for second argument.

Sara
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Sometimes drives fill up and we don't know why.  If you don't understand the best way to use the tools available, you may end up being stumped as to why your drive says it's not full when you have no space left!  Here's how you can find out...
The recent Microsoft changes on update philosophy for Windows pre-10 and their impact on existing WSUS implementations.
This tutorial will show how to push an installation of Backup Exec to an additional server in both 2012 and 2014 versions of the software. Click on the Backup Exec button in the upper left corner. From here, select Installation and Licensing, then I…
This tutorial will walk an individual through locating and launching the BEUtility application to properly change the service account username and\or password in situation where it may be necessary or where the password has been inadvertently change…

828 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question