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Implementing CIFS: SMBThe Echo. Count field is a multiplier. It tells the server. Echo. Count times. If Echo. Count is zero. If Echo. Count is 9,9. We say likely because of the wide variety. One bit of weirdation is that all of the systems that were tested. ECHO REQUEST even if no SESSION. SETUP had been sent and no authentication performed. This behavior is, in fact. Echo. Count replies to a single. It would probably be safer for the server to send a. ERRSRV/ERRnosupport error message in response to an. ECHO REQUEST.). Other strangisms of note. In testing, Windows/9x systems returned an "Invalid. TID" error unless the TID was set to 0x. FFFF. Also. these systems sent back at most a single reply, handling. Echo. Count as if it were a boolean. Windows. NT4 and Windows. K would try to send as many. Echo. Count. If the data block. SMB_DATA. Bytes) was very large (4. K was tested) and the. Echo. Count very high (eg, 2. Samba has an upper limit of 1. Also. Samba sends the replies fast enough that multiple replies will be. TCP packet. (That's normal behavior. TCP stream.). The Windows. NT4 (Service Pack 6) system used in testing. Windows. 20. 00 seems to have an upper limit of 1. TCP connection. email. From. Conrad Minshall, Apple Computer. To. Chris Hertel. Cc. Samba Technical Mailing List. Subject. Re: Bizarre limit alert. I saw the same "packet drop" with an overlong. WRITE_ANDX. The maximum buffer size an NT SP6 claims on the. NEGOTIATE response is 0x. This limit is not on the. SMB header (3. 2 bytes) and the SMB. Based upon the size of an ECHO command I'd expect you. No apologies. This is CIFS we're talking about. The ECHO SMB may be one of those things that gets coded up. It also. appears as though ECHO hasn't been tested much. Certainly. the more it is stressed the more variation that can be seen. There. is, however, something to note in the last example in the list above. Conrad: once you know what you're looking at. These common themes are derived from common. Another fine point highlighted by our quick look at the. ECHO SMB is that TCP is designed to carry streams of. This can be seen in the results of the. Samba, in which multiple replies were contained in a. TCP packet. At the other extreme, several TCP packets are. ECHO if it has a very large data. As a result, a single read operation may or may not return. SMB message. Oversimplification Alert: The Recv. Timeout() function (provided way back in Listing. SMB message will be. That's a weak. assumption. It works well enough for the simple testing we have. SMB implementation. A better version of Recv. Timeout() would verify the. NBT SESSION_MESSAGE. LENGTH. field value to ensure that only one message is read at a time, and. Readin', Writin', and 'Rithmatic. Here is a quick run- down on some of the basic essentials of SMB. This SMB is discussed in examples given throughout the SNIA. That's because it. Leach/Naik CIFS draft. The NT_CREATE_ANDX SMB is now considered the more. Servers must still support the. OPEN_ANDX SMB, however, and there are certainly clients. NT LM 0. 1. 2 dialect). It's times like these that the earlier documentation comes in. The OPEN_ANDX SMB is used to gain access to a file for. The. open file is identified by a FID (File ID). The FID, of course, is returned by a successful. OPEN_ANDX call. It seems fairly obvious. This one lets you read blocks of data. The READ_ANDX. request supports 6. Offset. High. field is present (if it is present, the Word. Count will be. An oddity of the READ_ANDX is the Max. Count. High. field, which is only used if the CAP_LARGE_READX. Max. Count. High is an unsigned long. Max. Count field. Two. problems with this. Why use a 3. 2- bit field to hold 1. Even with CAP_LARGE_READX set, the maximum large read. K. That should fit into the Max. Count field with. Max. Count. High. Play with it and see what happens. Should be interesting. WRITE_ANDX. Allows writing to a file or device. This SMB can also be. Offset. High field, thus. There is also a Data. Length. High. field that is comparable to the Max. Count. High from the. READ_ANDX. In this case, though, the. Data. Length. High field is given as an unsigned short. That's only two bytes, which makes more sense. This one may be considered deprecated. Newer clients probably. SEEK_ANDX, but servers may need to. From. Charles Caldarale. To. j. CIFS Mailing List. SMB_COM_SEEK is a useless SMB, since all of the read and. It's not. surprising it wasn't used; it would have been a waste of network. Chuck. See also the SNIA doc's comments regarding this SMB. The SMB_COM_FLUSH has nothing to do with plumbing. It is sent by the client to ask the server to write all data and. FID) to disk. If a FID value of 0x. FFFF is given, the server is being. TID. NT_CREATE_ANDX. This SMB is used to open, create, or overwrite a file or. It offers a myriad of options for file attributes, file. As the "NT" in the name implies. NT_CREATE_ANDX SMB is closely tied to the feature set. Windows. NT filesystem calls. Here's where you start. Windows itself. One problem with complex calls such as this is that the number. There are various reports describing combinations of values that. Windows. NT client or server to go BSOD (Blue. Screen Of Death). Have fun with your testing. There is yet another version of this SMB known as the. NT_TRANSACT_CREATE, which is implemented as a sub- command. SMB_COM_NT_TRANSACTION SMB. It is used to apply. Extended Attributes (EAs) or Security Descriptors (SDs) to a file. All good things must come to an end. Close the file, say. Remember earlier when we talked about SMB messages as if we were. Well. we've moved beyond Entomology, Invertebrate Zoology, Taxonomy, and. We're now studying really complex stuff like Sociology. Psychology, and Numismatics, and we get to put the little critters. Skinner boxes and see how they react to various stimuli. It's. important research, and there are all sorts of interesting things to. Consider, for example, the SMB_COM_COPY command. It's. supposed to allow you to copy a file from one location on the server. That saves the client from having to read the. A good idea, eh? Unfortunately, no one seems to be able to get it to work- -at least. Windows servers. There has been some limited success in. Greg Mc. Cain. To. Chris Hertel. Subject. CIFS and SMB_COPYChris,I found that smb_copy will in fact copy a file iff. Instead, just specify the names of the. The resulting destination file will be named like the source. It will NOT be named as specified in. Hence "smb_copy wanda - > fred" results. This works on the . NET server RC1 and Windows 2. I've tried. Hope it helps. SMB is an old protocol, and it has gotten sloppy over the years. As you work your way through the SMB messages, implementing first the. It's not your fault. Say it to yourself now: "It's not my fault.". That will prevent you from getting frustrated and doubting your own. It's really not your fault. Transaction SMBs. We are going to blast through this, so you'd better get your. The purpose of the Transaction SMBs is to carry specialized. Examples include the Remote. Administration Protocol (RAP) and Microsoft's. DCE/RPC (MS- RPC). There are other, more esoteric. We will play with some of them when we get to. Browse Service. Think of these sub- protocols as sets of function calls that are. As suggested in figure 2. The call is then completed at the. In CIFS jargon, that's called a transaction. Figure 2. 1. 8]Transactions are designed to be able to transfer more data than the. They do so by. fragmenting the payload. The protocol for sending large. Protocol Data Units (PDUs) is described in a. A primary Transaction SMB is sent. It. includes the total expected size of the transaction (so that the. It also contains as much. SMB message. If everything. The server sends back an interim response. If the. interim response contains an error code then the transaction will. Otherwise, it is a signal telling the client to. The WORDCOUNT and BYTECOUNT fields are. The client sends as many secondary. Transaction SMBs as necessary to complete the transaction request. The server executes the called function. The server sends as many response messages as. In some cases the request does. There are three primary Transaction SMBs. SMB_COM_TRANSACTION == 0x. SMB_COM_TRANSACTION2 == 0x. SMB_COM_NT_TRANSACT == 0x. A0. Those are really long names, so folks on the various mailing lists. SMBtrans", "Trans. NTtrans", respectively. Each of these also has a matching. SMB_COM_TRANSACTION_SECONDARY == 0x. SMB_COM_TRANSACTION2_SECONDARY == 0x. SMB_COM_NT_TRANSACT_SECONDARY == 0x.
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