The value of this integer is generated by the server upon completion of a successful SMB2/TreeConnect call. Tree IDĪn integer that identifies a specific share that is mounted. Normally for non-async commands the P bit will be set to 0 and the PID will be set to the default value of 0x0000feff. See SMB2/Cancel for a discussion on how the PID is used in these cases. This is used by SMB2/Notify and SMB2/Cancel to set and cancel a directory watch but can also be used for reads from named pipes if they can not be completed immediately. If the client wants to SMB2/Cancel a pending command it can do so by sending a SMB2/Cancel to the server with the P bit set to 1 and the PID as was returned in the initial STATUS_PENDING reply. Once the command completes later the server will send a second reply to the command, this time still keeping the P bit set to 1 and repeating the same PID as in the initial STATUS_PENDING reply. This STATUS_PENDING reply has the P bit set to 1 to indicate that the PID is valid. If a SMB2 command can not be completed immediately the server will respond immediately with STATUS_PENDING and specify a value for the PID that the client can use later to Cancel the request. The Process ID of the server process/thread for a command with deferred/async completion. The command sequnce number starts with 0 for the initial SMB2/NegotiateProtocol command and is incremented by one for each additional command.Ĭommand sequence number -1 is used when servers sends unsolicited oplock breaks SMB2/Break to clients. This is the command sequnce number for the TCP session used to match requests to responses. The offset to the next SMB2 PDU within the current NBT PDU. =1 signature is present, =0 signature is not present =1 the PID field is valid, =0 PID is not validĬ: End of Chain =1 this is the last PDU in a chain =1 if this is a response, =0 for a request See below for a list of known command opcodes. Total length of the SMB2 header including the 0xFE 'S' 'M' 'B' signature. Microsoft's : Server Message Block (SMB) Version 2 Protocol Specification Implementations SMB2 Header StructureĪs for the older SMB protocol, all multibyte integers are represented in little-endian format. You cannot directly filter on SMB2 while capturing but you can capture for TCP port 445 External links Show only the SMB2 based traffic : smb2 Capture Filter That is: conditional ACEs (use filter "nt.ace.cond"), system resource attribute ACEs (use filter "nt.ace.sra") and scopred policy ID ACEs (use filter "nt.ace.type = 19").Ī complete list of SMB2 display filter fields can be found in the display filter reference Smb2_dac_ A capture containing SMB2/GetInfo and SMB2/SetInfo with examples of Dynamic Access Control specific ACEs. Smb2-peter.pcap Simulated traffic (containing file reads/writes) between a Samba 4.4.x client and server on Arch Linux (from June 2016). Smb-on-windows-10.pcapng Handshake between two workstations running Windows 10 Ifstest.out The log output from the ifstest.exe tool A capture of two Vista beta2 boxes running ifstest.exe (XXX add links to preference settings affecting how DCE/RPC is dissected). The SMB2 dissector is partially functional. XXX - Add example traffic here (as plain text or Wireshark screenshot).
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