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Hi Andreas,
I might have exactly the right thing for you.
This is a copy of a mail that I sent some time ago (31 Jan 97) to
Juergen (from which I didn't get a reply yet).
Please let me know if it works for you.
Regards,
Hans
Hi Juergen,
First of all I have to express my admiration for the professional
quality of the complete Scotty package!
Code quality is good, documentation is excellent etc. etc.
Despite all this, I found some bugs which you might want to include in
your next release of Scotty.
The context is as follows:
We implemented an snmp agent in tnm which we want to use to control and
monitor equipment.
For this reason we have written our own MIB which makes extensive use of
arrays.
The snmp manager can create new rows in such an array and delete them
again.
The control of a row is managed through a status field which can be set
to:
1 locked and activated
2 unlocked
3 delete
The index of a row is for example the IP address and an ID.
An example of an instance of the field "status" in the array row with
index IP address 193.70.135.1 and ID 1234 would be:
...enterprises.<our
company>.<device>.<tables>.<status>.193.70.135.1.1234
In the instance database in tnm, you create intermediate nodes which
hold the index variables.
For example 193, 70, 135, 1 and 1234 all result in intermediate nodes of
which only the node 1234 is used to bind the actual instance value.
Problem number 1:
When I delete the instance variable which is bound to the instance node,
the intermediate nodes never get deleted. This is a memory leak and also
causes malfunction of FindNextNode.
I fixed this by changing the semantics of the offset field in the
SNMP_Node structure:
For intermediate nodes, the offset field is now also set to the
instance part of the name.
The RemoveNode function is rewritten to make sure that all intermediate
nodes are deleted as well whenever an instance variable is deleted.
Because of the recursive nature of this function, I had to rewrite this
function extensively.
I tested it and works well now.
Problem number 2:
The FindNextNode can return intermediate nodes which do not contain an
instance variable. This causes the get-next function to fail, in stead
of returning the next instance variable.
This problem occurs when one binds a piece of tcl code to an MIB node
without having an instance variable for this node.
This is fixed by some extra tests in FindNextNode.
I tested this and it doesn't give me any problems any more.
Problem number 3:
I have code which deletes a whole array row when the status field of
that row is set to the value 3.
I did this in the commit call back and it resulted in a core dump.
I fixed this by making the code Tnm_SnmpEvalNodeBinding more safe.
I tested this and it now is no problem to delete the instance variable
related to the node for which a commit callback code is executed.
I didn't mail this to the mailing list yet, I leave it up to your
judgement whether it would be useful to send this to everybody.
Thanks again and best regards,
Hans Dekker
This is the file which contains all the changes:
Hans Dekker
e-mail: gjd@irdeto.nl
Tel: +31 23 5679381
Fax: +31 23 5679320
GSM: +31 653207330
>-----Original Message-----
>From: Andreas Bokeloh [SMTP:Andreas.Bokeloh@Informatik.Uni-Oldenburg.DE]
>Sent: Thursday, April 03, 1997 17:14
>To: tkined@ibr.cs.tu-bs.de
>Subject: Problem with mib tables
>
>Hi,
>I'm trying to implement a mib which I wrote and discovered a problem with
>tables which have two attributes as their index. When I remove all attributes
>with the same first index by unsetting the bound variables, all entries
>behind
>these attributes disappear, although the bound variables still exist.
>I have appended an example using the udpTable from the MIB-II which shows the
>same behaviour.
>EntryList contains the entries for udpTable. CreateTable registers the table
>instances by binding them to a variable in the global array MibArray using
>the
>OID as an index.
>RemoveAddr removes all entries with a certain address entry from EntryList
>and
>unsets the corresponding variables in MibArray().
>After unsetting the last entry with a given address all bindings with bigger
>indexes are gone, too.
>I use scotty version 2.1.5 on an i486 under Linux 2.0.28.
>Can anybody tell me what's wrong?
>Thanks in advance.
>Bye, Andreas.
>
>############ begin example ############
>#!/usr/bin/scotty2.1.5
>
>proc CreateTable {TableName EntryList} {
> set TableOID [mib oid $TableName]
> global SnmpSession MibArray
> foreach TableRow $EntryList {
> set index1 [lindex $TableRow 0]
> set index2 [lindex $TableRow 1]
> set counter 0
> foreach RowEntry $TableRow {
> incr counter
> set TmpOID $TableOID.1.$counter.$index1.$index2
> $SnmpSession instance $TmpOID MibArray($TmpOID) $RowEntry
> $SnmpSession bind $TmpOID get {
> puts "Received SNMP-Get on %o"
> }
> }
> }
>}
>
>proc RemoveAddr Set {
> global EntryList MibArray
> set NewList {}
> set TmpOID "[mib oid udpTable].1"
> foreach SetEntry $EntryList {
> if {[lindex $SetEntry 0] != $Set} then {
> lappend NewList $SetEntry
> } else {
> set Index0 [lindex $SetEntry 0]
> set Index1 [lindex $SetEntry 1]
> set counter 0
> foreach Entry $SetEntry {
> incr counter
> unset MibArray($TmpOID.$counter.$Index0.$Index1)
> }
> }
> }
> set EntryList $NewList
>}
>
>set MibArray() ""
>set SnmpSession [ snmp session -port 1701 -agent "" ]
>
>set EntryList {\
> {127.0.0.1 255}\
> {127.0.0.1 256}\
> {0.0.0.0 1}\
> {0.0.0.0 2}\
> {192.168.13.0 0}\
> {192.168.13.0 1}\
> {192.168.13.0 2}\
> {192.168.13.0 3}\
> {192.168.13.0 4}\
> {192.168.13.0 5}\
> {192.168.14.0 6}\
> {192.168.14.0 7}\
> {192.168.14.0 8}\
> {192.168.14.0 9}\
> {192.168.14.0 10}\
>}
>CreateTable udpTable $EntryList
>
>RemoveAddr 192.168.13.0
>foreach blafasel [lsort [array names MibArray]] {
> puts $blafasel
>}
>
>#exit
>puts "Agent running..."
>############ end example ############
>--
>Email: Andreas.Bokeloh@informatik.uni-oldenburg.de
>
>--
>!! This message is brought to you via the `tkined & scotty' mailing list.
>!! Please do not reply to this message to unsubscribe. To subscribe or
>!! unsubscribe, send a mail message to <tkined-request@ibr.cs.tu-bs.de>.
>!! See http://wwwsnmp.cs.utwente.nl/~schoenw/scotty/ for more information.
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