An extensible file access method for accessing a foreign file system from a data processing system with a native file system, said foreign file system and said native file system implementing different file system protocols, and wherein files created by the foreign file system may not be accessed using a native file system protocol, said file access method comprising: The file access method of claim 1wherein the file access method is extended to support a second foreign file system by providing a translation from the intermediate programming interface to the second foreign file system protocol, said method further comprising: The file access method of claim 1wherein the file access method is extended to support a second native file system by providing a translation from the second native file system protocol to the intermediate programming interface, said method further comprising:
It is backwards compatible with all of the other SMB variants. In the purest sense, this means that a client sends a request to a server, which acts on the request and returns a reply.
This brings out an important point in Samba terminology: A server is a machine with a resource to share. A client is a machine that wishes to use that resource.
A server can be a client of another computer's resource at any given time. Note that there are no implications as to the amount of resources that make up a server, or whether it has a large disk space or fast processor. A server could be an old with a printer attached to it, or it could be an UltraSparc station with a 10 gigabyte disk service.
Microsoft Windows products have both the SMB client and server built in to the operating system. Unfortunately, on the client side there are far fewer offerings, limited mainly to Digital Equipment's Pathworks product, and of course, Samba.
We present this information largely as a way to help you get familiar with how the SMB protocol negotiates connections with other computers on the network. There are four steps that the client and server must complete in order to establish a connection to a resource: Establish a virtual connection.
Negotiate the protocol variant to speak. Make a tree smb write andx response to literature to a resource. We will examine each of these steps through the eyes of a useful tool that we mentioned earlier: You can download this program at samba. Use this program as you would use the standard tcpdump application, but add the -s switch to ensure that you get the whole packet and not just the first few bytes.
The result is a bidirectional virtual channel between the client and server. In reality, there are only two messages that the client and server need to establish this connection. This is shown in the following example session request and response, as captured by tcpdump: Next, the client sends a message to the server to negotiate an SMB protocol.
As mentioned earlier, the client sets its tree identifier TID field to zero, since it does not yet know what TID to use. A tree identifier is a number that represents a connection to a share on a server.
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The command in the message is SMBnegprot, a request to negotiate a protocol variant that will be used for the entire session. Note that the client sends to the server a list of all of the variants that it can speak, not vice versa. The server responds to the SMBnegprot request with an index into the list of variants that the client offered, starting with index 0, or with the value 0xFF if none of the protocol variants are acceptable.
Continuing this example, the server responds with the value 5, which indicates that the NT LM 0. This includes the account name and password if there is onethe workgroup name, the maximum size of data that can be transferred, and the number of pending requests that may be in the queue at any one time.
In the following example, the Session Setup command presented allows for an additional SMB command to be piggybacked onto it.
The letter X at the end of the command name indicates this, and the hexadecimal code of the second command is given in the Com2 field. In this case the command is 0x75, which is the Tree Connect and X command.
This is the last field listed in the following request. Using the "and X" commands like this speeds up each transaction, since the server doesn't have to wait on the client to make a second request.
Note that the TID is still zero. The server will provide a TID to the client once the session has been established and a connection has been made to the requested resource. In addition, note that the password is sent in the open.
We can change this later using encrypted passwords: It also sets the ServiceType field to "A" to indicate that this is a file service. Available service types are: Now that a TID has been assigned, the client may issue any sort of command that it would use on a local disk drive.
It can open files, read and write to them, delete them, create new files, search for filenames, and so on.If the operation is successful, the server MUST construct an SMB_COM_READ_ANDX Response (section ) message with the following additional requirements: If the request was to a named pipe, Available MUST be set to the number of bytes remaining to be read from the named pipe, which can be .
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More information. Receiving an SMB_COM_WRITE_ANDX Request When the server receives an SMB_COM_WRITE_ANDX Request (section ), message handling proceeds as follows. The server MUST verify that the FID field represents a valid Open (has an entry in the SMB connection 's timberdesignmag.comenTable).
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