rfc2593.txt

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RFC 2593                    SMX Protocol 1.0                    May 1999


6.1.4.  Processing the `resume' Command

   When the runtime system receives a `resume' command, it processes it
   as follows:

   1.   If there is a syntax error in the running script identifier or
        if there is no running script matching the identifier, a `431'
        reply is sent and processing of the command is stopped.

   2.   If the running script is already in the state `running', a `231'
        reply is sent and processing of the command is stopped.

   3.   If the running script is in the state `suspended', it is resumed
        and a `231' reply is sent after resuming. If resuming fails, a
        `434' reply is sent and processing of the command is stopped.

   4.   If the `start' command is still being processed for the script,
        a `231' reply is sent when the state `running' has been reached.

   5.   If the running script is in any other state, a `434' reply is
        sent.

6.1.5.  Processing the `abort' Command

   When the runtime system receives an `abort' command, it processes it
   as follows:

   1.   If there is a syntax error in the running script identifier or
        if there is no running script matching the identifier, a `431'
        reply is sent and processing of the command is stopped.

   2.   If the running script is already aborted, a `232' reply is sent
        and processing of the command is stopped.

   3.   The running script is aborted and a `232' reply is sent after
        aborting. If aborting fails, a `434' reply is sent and
        processing is stopped.

6.1.6.  Processing the `status' Command

   When the runtime system receives a `status' command, it processes it
   as follows:

   1.   If there is a syntax error in the running script identifier or
        if there is no running script matching the identifier, a `431'
        reply is sent and processing of the command is stopped.

   2.   The status of the script is obtained and a `231' reply is sent.



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6.1.7.  Generation of Asynchronous Notifications

   The runtime system generates or may generate the following
   notifications:

   1.   If a change of the status of a running script is observed by the
        runtime system, a `531' reply is sent.

   2.   A `534' reply is sent if a running script terminates normally.

   3.   A `535' reply is sent if a running script terminates abnormally.

   4.   If a script generates an intermediate result, a `532' reply is
        sent.

   5.   If a script requests the generation of a `smScriptResult'
        notification, a `533' reply is sent.

   6.   Besides the notifications mentioned above, the runtime system
        may generate arbitrary `511' replies, which are logged or
        displayed by the SNMP agent.

6.2.  SMX Message Processing on the SNMP Agent

   This section describes the conditions under which an SNMP agent
   implementing the Script MIB generates SMX commands. It also describes
   how the SNMP agent processes replies to SMX commands.

6.2.1.  Creating a Runtime System

   New runtime systems are started by the SNMP agent while processing
   set requests for a `smLaunchStart' variable. The SNMP agent first
   searches for an already running runtime systems which matches the
   security profiles associated with the `smLaunchStart' variable. If no
   suitable runtime system is available, a new runtime system is started
   by preparing the environment for the new runtime system and starting
   the executable for the runtime system in a new process which conforms
   to the operating system security profile. The SNMP agent prepares to
   accept a connection from the new runtime system. The `smRunState' of
   all scripts that should be executed in this new runtime system is set
   to `initializing'.

6.2.2.  Generating the `hello' Command

   The `hello' command is generated once a connection request from a
   runtime system has been accepted. The SNMP agent sends the `hello'
   command as defined in section 5.2. The SNMP agent then expects a
   reply from the runtime system within a reasonable timeout interval.



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RFC 2593                    SMX Protocol 1.0                    May 1999


   1.   If the timeout expires before the SNMP agent received a reply,
        then the connection is closed and all data associated with it is
        deleted.  Any scripts that should be running in this runtime
        system are aborted, the `smRunExitCode' is set to `genericError'
        and `smRunError' is modified to describe the error situation.

   2.   If the received message can not be analyzed because it does not
        have the required format, then the connection is closed and all
        data associated with it is deleted. Any scripts that should be
        running in this runtime system are aborted, the `smRunExitCode'
        is set to `genericError' and `smRunError' is modified to
        describe the error situation.

   3.   If the received message is a `211' reply, then the `Id' is
        checked whether it matches the `Id' used in the `hello' command.
        If the `Id' matches, then the `Version' is checked. If the
        `Version' matches a supported SMX protocol version, then the
        `Cookie' is checked whether it matches the cookie passed to the
        runtime system. If any of these tests fails, then the connection
        is closed and all data associated with this runtime system is
        deleted. Any scripts that should be running in this runtime
        system are aborted, the `smRunExitCode' is set to `genericError'
        and `smRunError' is modified to describe the error situation.

   4.   Received messages are discarded if none of the previous rules
        applies.

6.2.3.  Generating the `start' Command

   The `start' command is generated while processing set-requests for a
   `smLaunchStart' variable. The `start' command assumes that the SNMP
   agent already determined a runtime system suitable to execute the
   script associated with the `smLaunchStart' variable.  The SNMP agent
   sends the `start' command as defined in section 5.2 to the selected
   runtime system. The SNMP agent then expects a reply from the runtime
   system within a reasonable timeout interval.

   1.   If the timeout expires before the SNMP agent received a reply,
        then the SNMP agent sends an `abort' command to abort the
        running script and sets the `smRunState' of the running script
        to `terminated', the `smRunExitCode' to `genericError' and
        `smRunError' is modified to describe the timeout situation.

   2.   If the received message can not be analyzed because it does not
        have the required format, then the message is ignored. The SNMP
        agent continues to wait for a valid reply message until the
        timeout expires.




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   3.   If the received message is a `4yz' reply and the `Id' matches
        the `Id' of the `start' command, then the SNMP agent assumes
        that the script can not be started. The `smRunState' of the
        running script is set to `terminated', the `smRunExitCode' to
        `genericError' and the `smRunError' is modified to contain a
        message describing the error situation.

   4.   If the received message is a `231' reply and the `Id' matches
        the `Id' of the `start' command, then the `smRunState' variable
        of the running script is updated.

   5.   Received messages are discarded if none of the previous rules
        applies.

6.2.4.  Generating the `suspend' Command

   The `suspend' command is generated while processing set-requests for
   the `smLaunchControl' and `smRunControl' variables which change the
   value to `suspend'. The SNMP agent sets the `smRunState' variable to
   `suspending' and sends the `suspend' command as defined in section
   5.2. The SNMP agent then expects a reply from the runtime system
   within a reasonable timeout interval.

   1.   If the timeout expires before the SNMP agent received a reply,
        then the SNMP agent sends an `abort' command to abort the
        running script and sets the `smRunState' of the running script
        to `terminated', the `smRunExitCode' to `genericError' and
        `smRunError' is modified to describe the timeout situation.

   2.   If the received message can not be analyzed because it does not
        have the required format, then the message is ignored. The SNMP
        agent continues to wait for a valid reply message until the
        timeout expires.

   3.   If the received message is a `401', `402' or a `431' reply and
        the `Id' matches the `Id' of the `suspend' command, then the
        runtime systems is assumed to not provide the suspend/resume
        capability and processing of the `suspend' command stops.

   4.   If the received message is a `231' reply and the `Id' matches
        the `Id' of the `suspend' command, then the `smRunState'
        variable of the running script is updated.

   5.   Received messages are discarded if none of the previous rules
        applies.






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6.2.5.  Generating the `resume' Command

   The `resume' command is generated while processing set-requests for
   the `smLaunchControl' and `smRunControl' variables which change the
   value to `resume'. The SNMP agent sets the `smRunState' variable to
   `resuming' and sends the `resume' command as defined in section 5.2.
   The SNMP agent then expects a reply from the runtime system within a
   reasonable timeout interval.

   1.   If the timeout expires before the SNMP agent received a reply,
        then the SNMP agent sends an `abort' command to abort the
        running script and sets the `smRunState' of the running script
        to `terminated', the `smRunExitCode' to `genericError' and
        `smRunError' is modified to describe the timeout situation.

   2.   If the received message can not be analyzed because it does not
        have the required format, then the message is ignored. The SNMP
        agent continues to wait for a valid reply message until the
        timeout expires.

   3.   If the received message is a `401', `402' or a `431' reply and
        the `Id' matches the `Id' of the `resume' command, then the
        runtime systems is assumed to not provide the suspend/resume
        capability and processing of the `resume' command stops.

   4.   If the received message is a `231' reply and the `Id' matches
        the `Id' of the `resume' command, then the `smRunState' variable
        of the running script is updated.

   5.   Received messages are discarded if none of the previous rules
        applies.

6.2.6.  Generating the `abort' Command

   The `abort' command is generated while processing set-requests for
   the `smLaunchControl' and `smRunControl' variables which change the
   value to `abort'. In addition, the `abort' command is also generated
   if the `smRunLifeTime' variable reaches the value 0. The SNMP agent
   sends the `abort' command as defined in section 5.2. The SNMP agent
   then expects a reply from the runtime system within a reasonable
   timeout interval.

   1.   If the timeout expires before the SNMP agent received a reply,
        then the SNMP agent sets the `smRunState' of the running script
        to `terminated', the `smRunExitCode' to `genericError' and
        `smRunError' is modified to describe the timeout situation.





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   2.   If the received message can not be analyzed because it does not
        have the required format, then the message is ignored. The SNMP
        agent continues to wait for a valid reply message until the
        timeout expires.

   3.   If the received message is a `4yz' reply and the `Id' matches
        the `Id' of the `abort' command, then the SNMP agent assumes
        that the script can not be aborted. The `smRunState' of the
        running script is set to `terminated', the `smRunExitCode' to
        `genericError' and the `smRunResult' is modified to describe the
        error situation.

   4.   If the received message is a `232' reply and the `Id' matches
        the `Id' of the `abort' command, then the `smRunExitCode'
        variable of the terminated script is changed to either `halted'
        (when processing a set-request for the `smLaunchControl' and
        `smRunControl' variables) or `lifeTimeExceeded' (if the `abort'
        command was generated because the `smRunLifeTime' variable
        reached the value 0). The `smRunState' variable is changed to
        the value `terminated'.

   5.   Received messages are discarded if none of the previous rules
        applies.

6.2.7.  Generating the `status' Command