Real-time hierarchical protocol decoding

摘要

Real-time USB class level decoding is disclosed. In some embodiments, a first packet associated with a USB class level operation associated with a target USB device that is being monitored is received. A second packet generated by a USB hardware analyzer configured to observe USB traffic associated with the target USB device is received. It is determined based at least in part on a time associated with one or both of the first packet and the second packet that the class level operation has timed out.

主权项

1. A method of analyzing communication protocol data, comprising:
receiving a first packet associated with an operation associated with a first hierarchical level of operations associated with a target device that is being monitored, wherein the first hierarchical level of operations is one of a plurality of hierarchical levels of operations; receiving one or more packets generated by a hardware analyzer configured to observe device communication protocol traffic associated with the target device, wherein at least one of the one or more packets generated by the hardware analyzer comprises a “no activity” packet that the hardware analyzer is configured to generate and provide as output if the hardware analyzer determines that no activity has been seen on a monitored communication stream within a prescribed time; and determining that the operation associated with the first hierarchical level of operations has timed out in the event that the at least one of the one or more packets generated by the hardware analyzer are received after the first packet is received but before a subsequent second packet associated with the operation associated with the first hierarchical level of operations is received.