RADIUS Accounting Packet Processing
This article gives an explanation of how ClearBox Server processes RADIUS
accounting request packets. These packets have 'Accounting-Request' type
and are received on RADIUS accounting UDP port (default value is 1813
until another is set in server configuration). Read more about accounting
First, server tries to make custom packet processing if IRADIUSProcessor
interface is supported by server extension. If interface is not implemented,
this step is skipped.
Not only accounting packet can be custom-processed when they are received
on the RADIUS accounting port. It depends on result returned by IRADIUSProcessor::CanProcessPacket.
If extension can process packet with the type specified in the packet,
is called. If extension decides that packet processing is done, it may
return response packet, which is sent back to client immediately. If
no packet is returned, next step is performed. Response packet MUST
be returned for packets with non-standard types (other than Access-Request
Next, realm stripping is performed if IRADIUSRealmStripping
interface is supported by server extension:
- If it returns an error or nameOK parameter is set to VARIANT_FALSE,
accounting processing terminates.
- If packet proxy-forwarding is disabled ("Enable RADIUS proxy"
server configuration parameter is switched off) and forwardPacket
was set to VARIANT_TRUE, it's forced to be VARIANT_FALSE.
- If user name is empty after realm stripping then accounting processing
If server extension instructs server to forward packet after call to
(forwardPacket parameter was set to VARIANT_TRUE) , RADIUS proxy
manager is started (it is server configuration parameter), "Enable
RADIUS proxy" option is on and no loop is detected in chain
of servers that has forwarded the packet, it is passed to RADIUS proxy
manager, terminating accounting process. (See RADIUS
is called then, passing to server extension all attributes found in the
packet . If it returns A_DISCONNECT in response to this method call, server
tries to invoke INASManagement::DisconnectUser
on a synchronizer object associated with a NAS from which accounting packet
is received (see Synchronization process
article). Note, that A_DISCONNECT return value is valid only for packets
with 'Acct-Status-Type' attribute having value equal to 'Interim-Update'
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