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| MQMD-USERIDENTIFIER case changes |
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| leomelita |
 Posted: Wed Feb 16, 2005 5:29 am Post subject: MQMD-USERIDENTIFIER case changes |
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Newbie
Joined: 16 Feb 2005
Posts: 1
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We have an in-house app that sends a msg from z/OS (MQ 5.3) to HP-UX (MQ 5.2) setting the useridentifier context info to "AAbbbbb" (mixed case). When the msg is viewed on the UNIX platform the useridentifier appears as "aabbbbb" (all lowercase). This has caused authorization issues (2035) in attempting to return a COD report msg. We added a userid to the UNIX platform "aabbbbb" as a work-around. The COD report msgs are now received on the z/OS platform but the useridentifier appears as "AABBBBB" (all uppercase). The message data is mixed case and this is preserved in both directions! What controls this behavior?
Thanx! |
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| Eyal_Pu |
| Posted: Wed Feb 16, 2005 7:26 am Post subject: |
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Newbie
Joined: 05 Nov 2003
Posts: 4
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All you described are normal behaviors.
Unix works with lowercase user names.
Z/OS works with uppercase user names.
All of this is normal and part of the operation system.
On the other hand, MQ does not touch the data you send from side to side, since it can contain any number of things (files, numbers and more).
So there is nothing to worry about.  |
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| bbburson |
| Posted: Wed Feb 16, 2005 7:36 am Post subject: |
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Partisan
Joined: 06 Jan 2004
Posts: 378
Location: Nowhere near a queue manager
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| Eyal_Pu wrote: |
| Unix works with lowercase user names. |
Nonsense. UNIX user names can be lowercase, uppercase, or mixed and IT DOES MAKE A DIFFERENCE. The convention is to always make them lowercase but that's not a restriction imposed by the OS. |
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| kman |
| Posted: Mon Feb 21, 2005 10:10 pm Post subject: |
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Partisan
Joined: 21 Jan 2003
Posts: 309
Location: Kuala Lumpur, Malaysia
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can you provide your code snippet for the userid context setting here? from both sides?
it should not be changed in any way by WMQ, so we should try to inspect the code and how the setting/userid assignment is made. What is displayed when viewed (MQMD headers) normally is based on what was used. i.e., if you set the MQMD Userid value in mix case, the displayed should also be in mix case.
The COD failure report should also explain the reason for failure (in DLQ).
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| markt |
| Posted: Mon Feb 21, 2005 11:14 pm Post subject: |
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Knight
Joined: 14 May 2002
Posts: 508
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Because Unix userids are NORMALLY (though not always) in lowercase, and the userid on most other platforms is normally in uppercase (case insensitive), MQ will by default change the case of a userid to the appropriate kind for the platform. If you don't like that behaviour then instlaling a message exit for the channel - which does not have to actually do any work - will inhibit it.
Quoting from the books:
Platforms other than Windows systems and UNIX systems use uppercase characters for user IDs. To allow Windows systems and UNIX systems to use lowercase user IDs, the following conversions are carried out by the message channel agent (MCA) on these platforms:
At the sending end
The alpha characters in all user IDs are converted to uppercase, if there is no message exit installed.
At the receiving end
The alpha characters in all user IDs are converted to lowercase, if there is no message exit installed.
Note that the automatic conversions are not carried out if you provide a message exit on UNIX systems and Windows systems for any other reason. |
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