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SQL Stored Procedure --> Getting the server to send its MAC address to a client (trigger)

Posted on 2004-09-10
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Last Modified: 2008-02-01
Here's the problem......

I have a MS Access Application that connects to a SQL database on a remote server. What has to happen is that when the connection is made to the the server, the server needs to send back its MAC address to the application so I can compare it to the MAC address I have stored in a local MS access table.

Is there some kind of trigger / SP that will do this for me?

Thanks
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Question by:b_o_b
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by:mastoo
ID: 12026758
You'd have to probably run a proc to retrieve sysprocesses.net_address where spid = @@SPID from the master database.  I believe that is the client MAC address.
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by:jdlambert1
ID: 12026773
There is no T-SQL function for this, and the difficulty is compounded by the fact than many SQL Servers use mulitple network cards.

Here's a basis for one solution: Create a program that loops through a computer's LANA's, uses each LANA in an NCBASTAT command to get the MAC address for each network card, and then connect to the database and store the values in a configuration table of your own.

Here's some sample code to get started: http://support.microsoft.com/default.aspx?scid=kb;en-us;118623
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by:jdlambert1
ID: 12026833
I happily stand corrected (and better educated!). sysprocessess does indeed store the MAC addresses. Just be careful about one server having more than one...

Thanks, mastoo!
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by:jdlambert1
ID: 12026945
As simple as:

SELECT Distinct net_address
FROM master.dbo.sysprocesses
WHERE net_address <> ''

I didn't know you could do that!  I love EE!
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by:ShogunWade
ID: 12026946
ah.   one slight flaw,     "the server needs to send back its MAC address to the application "   of course net_address in sysprocesses is the client macaddress.
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by:jdlambert1
ID: 12026976
I tested the query using FROM master.dbo.sysprocesses against a couple of my systems, and it only returned the server's MAC addresses, so using the master table seems to be the key.
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by:jdlambert1
ID: 12027000
Okay, I'm still ignorant. sysprocesses only exists in master, so how come I'm not getting client addresses?
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ShogunWade earned 150 total points
ID: 12027001
BOL:

"net_address nchar(12) Assigned unique identifier for the network interface card on each user's workstation. When the user logs in, this identifier is inserted in the net_address column. "
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by:ShogunWade
ID: 12027051
jd,  i dont suppose you were lookin at the process info for any sql agent tasks ?
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by:ShogunWade
ID: 12027505
Try this:





CREATE PROCEDURE usp_ServerMacs AS

create table #t (a varchar(500))
insert #t
exec xp_cmdshell 'ipconfig /all'
select LTRIM(RTRIM(SUBSTRING(a,CHARINDEX(':',a)+1,200))) MacAddress from #t where a like '%physical address%'
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by:jdlambert1
ID: 12027745
I'm not only ignorant, I'm stupid. I ran it on development systems, not production boxes. The only connections were from the tools and services running on the dev systems.  Duh.

@@spid doesn't seem to help, as it "Returns the server process identifier (ID) of the current user process."

The command shell you posted worked for me, Shogun. I'm gonna bookmark this Q in case I ever need that. :)
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by:ShogunWade
ID: 12027806
no worries.    one slight thing is that the format returned has -'s in which is a a touch differnet than the net_address in sysprocesses.   but of course its trivial to remove those.   but I think it should return all macs.  cant really test that here though cos I've only got a single card :(
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by:jdlambert1
ID: 12027874
I tested it with multiple cards and it works perfectly!

You want us to take up a collection to get you a second card, Shogun?
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by:ShogunWade
ID: 12027902
Na, Ive got no free slots in this 8088 machine ;)
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by:mastoo
ID: 12029324
Ah, as you all observed I read the original question too quickly and thought the question was looking for the client MAC.  I like the shell approach above.  I think you ccould also use the sysprocesses method but just go after one of the sqle entries - since sqle is running on your sql server box (assuming you have sqle running).
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by:ShogunWade
ID: 12042603
only snag there is that the net_address is supressed for system processes, otherwise you could have easily done this by taking the net_address of SPID 1
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by:mastoo
ID: 12044813
I forgot sometimes people have trouble reading my mind.  By sqle I meant whatever account you have Sql Agent running under, assuming it is not just using the local system account.  It runs on the same box and shows up with the server's mac.  But the shell method is probably better as it doesn't rely on undocumented behavior such as counting on Sql Server storing the MAC in this column.
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by:ShogunWade
ID: 12296075
I think my solution gives what was asked
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by:jdlambert1
ID: 12301920
All points should go to Shogun, IMHO.
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