CN108664441B - USB read-only control system and method - Google Patents
USB read-only control system and method Download PDFInfo
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- CN108664441B CN108664441B CN201810771327.7A CN201810771327A CN108664441B CN 108664441 B CN108664441 B CN 108664441B CN 201810771327 A CN201810771327 A CN 201810771327A CN 108664441 B CN108664441 B CN 108664441B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 41
- 238000012790 confirmation Methods 0.000 claims abstract description 15
- 230000006870 function Effects 0.000 claims description 10
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 230000015654 memory Effects 0.000 claims description 2
- 238000005457 optimization Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
Abstract
The invention discloses a USB read-only control system and a method, which comprises a main Controller (CPU), a USB Device interface, a USB Host interface, a Device side uplink Buffer (BUD), a Device side downlink Buffer (BDD), a Host side uplink Buffer (BUH) and a Host side downlink Buffer (BDH), wherein the USB Device interface is respectively in data connection with an upstream Host, the BUD and the BDD, the CPU is respectively in data connection with the BUD, the BDD, the BUH and the BDH, the USB Host interface is respectively in data connection with the BUH, the BDH and a downstream Device, and the CPU is also in control connection with the USB Device interface, the USB Host interface, the BUD, the BDD, the BUH and the BDH. Judging whether the packet of the BDD is a data packet or not by the CPU to select the flow direction of the packet, wherein the flow direction of the packet is the data packet, reading other fields in the packet header and taking out the data packet from the BDD by the CPU, generating a confirmation object packet at the same time, and putting the confirmation object packet into the BUD; if not, the CPU controls the packet to flow into BDH and further into downstream devices.
Description
Technical Field
The invention belongs to the field of data reading, and particularly relates to a USB read-only control system and a method.
Background
Due to the particularity of the electronic evidence, when the electronic evidence is collected, in order to ensure the originality, authenticity and legality of the electronic evidence, a professional evidence obtaining device is adopted to copy and backup the electronic evidence file when the electronic evidence is collected, the evidence obtaining device is required to have the functions of read-only design, automatic calibration and the like, and the requirement on the electronic evidence obtaining equipment is greatly improved. At present, many devices control the read-only function of the USB interface by installing control software, and when the control software is damaged, the read-only function of the USB interface fails. Therefore, when the data of the device to be proved is read, the data of the device to be proved may be changed due to misoperation of personnel, so that the data of the device to be proved is not real.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the USB read-only control system and the USB read-only control method, which enhance the credibility and the safety of the USB interface and effectively ensure the authenticity of the data of the equipment to be proved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a USB read-only control system, comprising: a main Controller (CPU), a USB Device interface, a USB Host interface, a Device side uplink Buffer (BUD), a Device side downlink Buffer (BDD), a Host side uplink Buffer (BUH), and a Host side downlink Buffer (BDH); the USB Device interface is connected with a USB Host interface of an upstream Host, the USB Device interface is also respectively connected with the Device side uplink buffer and the Device side downlink buffer, the Device side uplink buffer and the Device side downlink buffer are also connected with the main controller, the main controller is also connected with the Host side uplink buffer and the Host side downlink buffer, the Host side uplink buffer and the Host side downlink buffer are also connected with the USB Host interface, the USB Host interface is also connected with a USB Device interface of a downstream Device, and the main controller is also in control connection with the USB Device interface, the USB Host interface, the Device side uplink buffer, the Device side downlink buffer, the Host side uplink buffer and the Host side downlink buffer.
Wherein, the USB interface is a SUB3.0 interface.
When the USB read-only control system runs, the main controller controls the running direction of each module according to the state of each module, and the USB read-only control system is also used for:
a. a USB Host interface of an upstream Host sends out a serial data stream, and the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and is sent into the link layer;
b. the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending packets except the non-control packets in the parallel data stream to a Device side downlink buffer;
d. the Device side downlink buffer transmits the packets except the non-control packet to a main controller, and the main controller analyzes the types of the packets except the non-control packet, reads the type field of the packet header of the packets except the non-control packet and judges whether the packets except the non-control packet are data packets for transmitting data; if not, entering the step e; if yes, entering step f;
e. the control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through the USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from a Device side downlink buffer according to the read data length information in the packet headers;
g. the master controller generates a confirmation transaction packet according to the information in the packet header of the taken data packet and puts the confirmation transaction packet into a Device side uplink buffer;
h. and the acknowledgement transaction packet in the Device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
As optimization, the USB Device interface and the USB Host interface both include a link layer and a physical layer, and the physical layer includes electrical interfaces for signals, so as to realize the functions of signal timing synchronization, serial-to-parallel/parallel-to-serial conversion, data caching, line coding and decoding of data, and scrambling and descrambling of data; the link layer can realize the functions of packet delimitation, link connection establishment and management and error detection.
And as optimization, the Device side uplink buffer, the Device side downlink buffer, the Host side uplink buffer and the Host side downlink buffer adopt SRAM memories.
During operation, the Device side downlink buffer and the Host side downlink buffer are used for storing data stream information of an upstream Host, the Host side uplink buffer is used for storing data stream information of a downstream Device, and the Device side uplink buffer is used for storing data stream information of the downstream Device and a confirmation transaction packet generated by the main controller.
The invention relates to a USB read-only control method, which comprises the following steps:
a. a USB Host interface of an upstream Host sends out a serial data stream, and the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and is sent into the link layer;
b. the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending packets except the non-control packets in the parallel data stream to a Device side downlink buffer;
d. the Device side downlink buffer transmits the packets except the non-control Packet to a main controller, and the main controller analyzes the types of the packets except the non-control Packet, reads the type field of the Packet header of the packets except the non-control Packet and judges whether the packets except the non-control Packet are Data Packets (DP) for transmitting Data; if not, entering the step e; if yes, entering step f;
e. the control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through the USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from a Device side downlink buffer according to the read data length information in the packet headers;
g. the main controller generates an Acknowledgement Transaction Packet (ACK TP) according to information in the Packet header of the taken data Packet and puts the ACK TP into a Device side uplink buffer;
h. and the acknowledgement transaction packet in the Device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
As optimization, the upstream Host and the downstream Device establish a PPP protocol, and the upstream Host sends a control signal to the downstream Device through the USB Device interface and the USB Host interface.
And as optimization, the downstream Device sends an uplink data stream through the USB Host interface, wherein a physical layer in the USB Host interface converts the serial data stream into a parallel data stream and sends the parallel data stream into a link layer, the link layer puts packets except control packets processed by the layer into a Host-side uplink buffer, and the Host controller moves the packets in the Host-side uplink buffer into a Device-side uplink buffer and sends the packets to the upstream Host through the USB Device interface.
The invention has the beneficial effects that:
during evidence collection, after the interface of the equipment to be collected evidence is inserted into the evidence collection device, the USB interface of the evidence collection device only has the function of reading data, so that the data in the equipment to be collected evidence can not be changed due to misoperation.
Drawings
FIG. 1 is a system block diagram of a USB read-only control system according to the present invention;
fig. 2 is a flow chart of processing downlink data of a USB read-only control system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a system framework diagram of the present invention. As shown in fig. 1, a USB read-only control system includes: the Device comprises a main Controller (CPU), a USB Device interface, a USB Host interface, a Device side uplink Buffer (BUD), a Device side downlink Buffer (BDD), a Host side uplink Buffer (BUH) and a Host side downlink Buffer (BDH). The Device side uplink buffer, the Device side downlink buffer, the Host side downlink buffer are used for storing data flow information of an upstream Host, the Host side uplink buffer is used for storing data flow information of a downstream Device, and the Device side uplink buffer is used for storing data flow information of the downstream Device and a confirmation transaction packet generated by the main controller.
The USB Device interface is connected with a USB Host interface of an upstream Host, the USB Device interface is also respectively connected with a Device side uplink buffer and a Device side downlink buffer, the Device side uplink buffer and the Device side downlink buffer are also connected with a main controller, the main controller is also connected with a Host side uplink buffer and a Host side downlink buffer, the Host side uplink buffer and the Host side downlink buffer are also connected with the USB Host interface, the USB Host interface is also connected with a USB Host interface of a downstream Device,
wherein, the USB read-only control system is also used for:
a. the USB Host interface of the upstream Host sends out a serial data stream, and the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and sent into a link layer;
the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending packets except the non-control packets in the parallel data stream to a Device side downlink buffer;
the device side downlink buffer transmits the packets except the non-control packets to the main controller, and the main controller analyzes the types of the packets except the non-control packets, reads the type fields of the packet headers of the packets except the non-control packets and judges whether the packets except the non-control packets are data packets for transmitting data; if not, entering the step e; if yes, entering step f;
e. a control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through a USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from the Device side downlink buffer according to the read data length information in the packet headers;
g. the main controller generates a confirmation transaction packet according to the information in the packet header of the taken data packet and puts the confirmation transaction packet into a Device side uplink buffer;
and the acknowledgement transaction packet in the h.device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
Wherein, the USB interface is a USB3.0 interface.
The USB Device interface and the USB Host interface both comprise a link layer and a physical layer, and the physical layer comprises electrical interfaces of signals, so that the functions of signal timing synchronization, serial-parallel/parallel-serial conversion, data caching, line coding and decoding of data, and scrambling and descrambling of the data can be realized; the link layer can realize the functions of packet delimitation, link connection establishment and management and error detection.
Fig. 2 is a flow chart of the downlink data processing of the present invention. As shown in fig. 2, a USB read-only control method includes the following steps:
a. the USB Host interface of the upstream Host sends out a serial data stream, and the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and sent into the link layer;
the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending a control packet processed by a link layer in a non-USB Device interface to a Device side downlink buffer;
the device side downlink buffer transmits the packets except the non-control Packet to the main controller, and the main controller analyzes the types of the packets except the non-control Packet, reads the Packet type field in the Packet header of the packets except the non-control Packet and judges whether the packets except the non-control Packet are Data Packets (DP) for transmitting Data; if not, entering the step e; if yes, entering step f;
e. a control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through a USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from the Device side downlink buffer according to the read data length information in the packet headers;
g. the main controller generates an Acknowledgement Transaction Packet (ACK TP) according to information in the Packet header of the taken data Packet and puts the ACK TP into a Device side uplink buffer;
and the acknowledgement transaction packet in the h.device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
The upstream host and the downstream Device establish a PPP protocol, and the upstream host sends a control flow signal to the downstream Device through the USB Device interface and the USBHost interface.
The downstream Device sends the uplink data stream through the USB Host interface, wherein a physical layer in the USB Host interface converts the serial data stream into a parallel data stream and sends the parallel data stream into a link layer, the link layer puts packets except control packets processed by the layer into a Host side uplink buffer, and the Host controller moves the packets in the Host side uplink buffer into a Device side uplink buffer and sends the packets to the upstream Host through the USB Device interface.
The working principle of the invention is as follows: the upstream host is a forensics device, and the downstream equipment is equipment to be forensics. When the downstream Device is connected to the upstream Host, the upstream Host sends a control flow signal for reading the downstream Device, the downstream Device sends an uplink data flow through the USB interface, the USB Host interface receives the uplink data flow and then carries out processing of a physical layer and a link layer, all packets which do not belong to the processing of the link layer are put into the Host side uplink buffer, and the Host controller moves the packets in the Host side uplink buffer into the Device side uplink buffer and sends the packets to the Host through the USB Device interface.
When the upstream Host sends out a serial data stream, the serial data stream is processed by a physical layer and a link layer in a USB Device interface, and the data stream which does not belong to the link layer is sent to a Device side downlink buffer, the main controller analyzes the type of the data stream summarized by the Device side downlink buffer, judges whether the data stream is a data packet for transmitting data, if not, the data packet is put into a Host side downlink buffer and sent to downstream equipment by the USB Host interface; if so, the upstream host initiates the operation of writing data into the downstream Device, the main controller further reads other fields in the packet header, takes out the whole data packet from the Device side downlink buffer according to the length of the data in the packet header, generates a confirmation transaction packet according to the related information in the packet header of the data packet, puts the confirmation transaction packet into the Device side uplink buffer, and sends the confirmation transaction packet to the upstream host through the USB Device interface. The number of acknowledgement transaction packets generated matches the number of data packets for the host.
The specific implementation of the USB read-only control system and method thereof of the present invention may involve the use of software, but the software used is the most common software used by those skilled in the art, and is not the scope of the claims.
Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
Claims (6)
1. A USB read-only control system, comprising:
the Device comprises a main controller, a USB Device interface, a USB Host interface, a Device side uplink buffer, a Device side downlink buffer, a Host side uplink buffer and a Host side downlink buffer; the USB Device interface is in data connection with a USB port of an upstream Host, the USB Device interface is also in data connection with the Device side uplink buffer and the Device side downlink buffer respectively, the Device side uplink buffer and the Device side downlink buffer are also in data connection with the main controller, the main controller is also in data connection with the Host side uplink buffer and the Host side downlink buffer, the Host side uplink buffer and the Host side downlink buffer are also in data connection with the USB Host interface, and the main controller is also in control connection with the USB Device interface, the USB3.0 Host interface, the Device side uplink buffer, the Device side downlink buffer, the Host side uplink buffer and the Host side downlink buffer;
wherein the USB read-only control system is further configured to:
a. a USB Host interface of an upstream Host computer sends out a serial data stream, the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and is sent into a link layer in the USB Device interface;
b. the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending packets except the non-control packets in the parallel data stream to a Device side downlink buffer;
d. the Device side downlink buffer transmits the packets except the non-control packet to a main controller, and the main controller analyzes the types of the packets except the non-control packet, reads the type field of the packet header of the packets except the non-control packet and judges whether the packets except the non-control packet are data packets for transmitting data; if not, entering the step e; if yes, entering step f;
e. the control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through the USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from a Device side downlink buffer according to the read data length information in the packet headers;
g. the master controller generates a confirmation transaction packet according to the information in the packet header of the taken data packet and puts the confirmation transaction packet into a Device side uplink buffer;
h. and the acknowledgement transaction packet in the Device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
2. The USB read-only control system of claim 1, wherein the USB Device interface and the USB Host interface each comprise a link layer and a physical layer, and the physical layers each comprise an electrical interface for signals, and can implement functions of signal timing synchronization, serial-to-parallel/serial conversion, data caching, line coding and decoding of data, scrambling and descrambling of data; the link layer can realize the functions of packet delimitation, link connection establishment and management and error detection.
3. The USB read-only control system according to claim 1, wherein the Device side uplink buffer, the Device side downlink buffer, the Host side uplink buffer, and the Host side downlink buffer use SRAM memories, the Device side downlink buffer and the Host side downlink buffer are used to store data flow information of the upstream Host, the Host side uplink buffer is used to store data flow information of the downstream Device, and the Device side uplink buffer is used to store data flow information of the downstream Device and the acknowledgement transaction packet generated by the Host controller.
4. A USB read-only control method is characterized by comprising the following steps:
a. a USB Host interface of an upstream Host computer sends out a serial data stream, the serial data stream is converted into a parallel data stream through a physical layer in a USB Device interface and is sent into a link layer in the USB Device interface;
b. the link layer in the USB Device interface is used for determining the boundary of the inflowing parallel data stream so as to judge whether the control packet is processed by the link layer; if so, the link layer processes the control packet; if not, entering the step c;
c. sending packets except the non-control packets in the parallel data stream to a Device side downlink buffer;
d. the Device side downlink buffer transmits the packets except the non-control packet to a main controller, and the main controller analyzes the types of the packets except the non-control packet, reads the type field of the packet header of the packets except the non-control packet and judges whether the packets except the non-control packet are data packets for transmitting data; if not, entering the step e; if yes, entering step f;
e. the control packet of the main controller flows into a Host side downlink buffer, and then is sent to downstream equipment through a USB Device interface of the downstream equipment through the USB Host interface;
f. the main controller further reads the information in the packet headers of the packets except the non-control packet, and takes out the complete data packet from a Device side downlink buffer according to the read data length information in the packet headers;
g. the master controller generates a confirmation transaction packet according to the information in the packet header of the taken data packet and puts the confirmation transaction packet into a Device side uplink buffer;
h. and the acknowledgement transaction packet in the Device side uplink buffer is sent to the upstream host through the USB Device interface and is compared and matched with the data packet quantity of the upstream host.
5. The USB read-only control method of claim 4, wherein the upstream Host establishes a PPP protocol with the downstream Device, and the upstream Host sends the control flow signal to the downstream Device through the USB Device interface and the USB Host interface.
6. The method of claim 4, wherein the downstream Device sends the upstream data stream through the USB Host interface, wherein the physical layer in the USB Host interface converts the serial data stream into a parallel data stream and sends the parallel data stream to the link layer, the link layer puts packets other than the control packets processed by the physical layer into the Host-side uplink buffer, and the Host controller moves the packets in the Host-side uplink buffer to the Device-side uplink buffer for sending to the upstream Host through the USB Device interface.
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