Are these zero length constructs actually allowed by the standard?
If they are not it might be better to just abort dissection completely
with a [malformed packet] message.
On 9/25/06, Anders Broman (AL/EAB) [EMAIL PROTECTED] wrote:
Hi,
Well there is one item of Zero length :)
Which may not be so easy to fix.
Brg
Anders
-Original Message-
From: [EMAIL PROTECTED] on behalf of Oleg Kostenko
Sent: Mon 9/25/2006 11:09 AM
To: Anders Broman; wireshark-dev@wireshark.org
Subject: Re: [Wireshark-dev] Fwd: And again BER errors while
decodingH248packets
Hello Anders,
BER errors are gone, but now some lines tell that there is '1 item' f
something, while actually there isn't:
...
Item: mediaDescriptor (1)
mediaDescriptor
termStateDescr
here: propertyParms: 1 item
serviceState: inSvc (2)
streams: oneStream (0)
oneStream
localControlDescriptor
reserveValue: False
reserveGroup: False
here: propertyParms: 1 item
Item: eventsDescriptor (4)
eventsDescriptor
requestID: 0
here: eventList: 1 item
...
--
Best regards,
Olegmailto:[EMAIL PROTECTED]
Monday, September 25, 2006, 1:08:29 AM, you wrote:
AB Hi,
AB I have checked in a fix please verify it with your traces.
AB Best regards
AB Anders
AB -Ursprungligt meddelande-
AB Från: Oleg Kostenko [mailto:[EMAIL PROTECTED]
AB Skickat: den 20 september 2006 10:41
AB Till: Anders Broman; wireshark-dev@wireshark.org
AB Ämne: Re[2]: Fwd: And again BER errors while decoding H248packets
AB Hello Anders,
AB Here is the fragment from the ASN.1 specification for H.248.
AB TerminationStateDescriptor ::= SEQUENCE
AB {
AB propertyParms SEQUENCE OF PropertyParm,
AB eventBufferControl EventBufferControl OPTIONAL,
AB serviceStateServiceState OPTIONAL,
AB ...
AB }
AB As I understand, SEQUENCE OF means zero or more elements, so it is
AB possible that there will be no propertyParms at all. So in terms of
AB ASN.1 the packet is correct and no BER errors should occur. Right?
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