pysmb is a pure Python implementation of the client-side SMB/CIFS networking protocol, designed to let Python applications access, transfer, and manage files on remote shared folders without mounting them to the host OS. ⚙️ Core Architecture and Capabilities
Protocol Compatibility: It supports both SMB1 and SMB2 variants natively. It automatically negotiates and falls back to SMB1 if SMB2 is unavailable on the destination server.
No OS Dependencies: Because it is written entirely in Python, it does not rely on local samba or Windows binaries, making it highly portable across Windows, Linux, and macOS. Primary Frameworks:
smb Module: Contains the core SMB operations, commands, and structures.
nmb Module: Handles NetBIOS over TCP/IP operations required to resolve names on local networks. 🛠️ Key Technical Implementations
SMBConnection: The synchronous, blocking connection class used for standard scripting.
SMBProtocolFactory: The asynchronous connection class engineered for integration with asynchronous network frameworks like Twisted.
Direct TCP Mode: Supports direct routing over port 445 (bypassing NetBIOS) or traditional port 139 routing. ⚠️ Critical Limitations and Caveats
Concurrency: A single SMBConnection instance is strictly non-thread-safe and cannot execute multiple file operations simultaneously.
Keepalive Disconnections: Most remote SMB servers enforce aggressive idle timeouts; keeping a connection open without active traffic will result in forced disconnections.
Operation Throttling: Remote servers strictly cap concurrent file transfers, meaning high-volume batch transfers require custom queuing algorithms to execute in sequenced batches. 💻 Implementation Example
A fundamental script to connect, list files, and download from a remote share utilizes the following structure:
from smb.SMBConnection import SMBConnection # Establish authentication and machine identities conn = SMBConnection( username=“domain_user”, password=“secure_password”, my_name=“local_client_hostname”, remote_name=“remote_server_name”, use_ntlm_v2=True, is_direct_tcp=True # Uses Port 445 ) # Connect to the remote server IP connected = conn.connect(“192.168.1.50”, 445) if connected: # List all files matching a wildcard pattern in a target share folder file_list = conn.listPath(service_name=“SharedFolder”, path=“/TargetDirectory”) for file in file_list: print(f”Found file: {file.filename}“) # Download a specific file to a local destination with open(“local_copy.txt”, “wb”) as local_file: conn.retrieveFile(service_name=“SharedFolder”, path=“/TargetDirectory/remote_file.txt”, file_obj=local_file) conn.close() Use code with caution. If you are planning an upcoming project, tell me: What operating systems are your client and server running?
Will you be transferring large batches of small files or single massive files?
Do you require an asynchronous network model like Twisted or standard synchronous scripts?
I can provide targeted code snippets or optimization strategies for your network environment. miketeo/pysmb
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