SMB Diag Tool (Server Message Block)

A small native Win32 C++ utility for testing SMB / Windows file share connectivity.

The tool performs these checks:

• Builds the target UNC path from the server and share fields.
• Resolves the SMB server name.
• Tests TCP connectivity to port 445.
• Optionally connects with supplied credentials through WNetAddConnection2.
• Checks whether the share path is accessible with GetFileAttributes.
• Attempts to enumerate the top-level directory entries.

Build

If Visual Studio Build Tools are installed, run:

.\build.ps1

You can also run build.cmd directly from cmd.exe.

Or use CMake with a Visual Studio generator:

cmake -S . -B build -G "Visual Studio 17 2022" -A x64
cmake --build build --config Release

The executable will be produced at:

build\Release\SmbDiagTool.exe

Notes

SMB authentication package selection is handled by Windows. The UI exposes Default, NT LAN Manager (NTLM), and Kerberos-style choices for diagnostic clarity, but this simple Win32 implementation does not force a specific SMB security package.