Police wireless local area network air interface protocol analysis equipment

Abstract

The invention discloses police wireless local area network air interface protocol analysis equipment. A PWL communication module is provided with a first CPU, an antenna interface, a data sending interface and a first interface management module, and the antenna interface, the data sending interface and the first interface management module are all in communication connection with the first CPU; the protocol analysis module is provided with a second CPU, a data receiving interface and a second interface management module, the data receiving interface and the second interface management module are both in communication connection with the second CPU, and PWL air interface data analysis software is installed in the second CPU; the password module is provided with a third CPU and a third interface management module, and the second interface management module is in communication connection with the third CPU. The antenna interface is connected to the antenna array, the data sending interface is in communication connection with the data receiving interface, and the first interface management module and the second interface management module are both in communication connection with the third interface management module. According to the invention, the situation that a non-original air interface data packet with a relatively high bit error rate is received and even the packet is lost due to an MIMO technology and a third-party monitoring mode is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of network communication, and in particular to a police wireless local area network air interface protocol analysis device. Background Art

[0002] When developing, debugging and testing communication equipment, it is usually necessary to use corresponding protocol analysis equipment to obtain data during the communication process and parse the acquired communication data, so as to determine whether the communication equipment has problems such as signaling format errors and parameter mismatches based on the analysis results.

[0003] Police Wireless Lan (PWL) technology is based on the existing wireless LAN technology, and is formed by modifying and developing the air interface protocol to meet the requirements of the public security industry. Currently, there are two technical systems for police wireless LAN technology: PWL-E and PWL-W. They are based on EUHT and IEEE 802.11 technologies respectively. Without changing the basic transmission mechanism and MIMO and other technologies, the message format and parameters of the key signaling in the EUHT and IEEE 802.11 air interface protocols are reconstructed and encrypted.

[0004] Due to the incompatibility of air interface protocols and air interface signaling encryption, existing protocol analysis equipment cannot be used to analyze PWL air interface data. During the development and testing of PWL equipment, air interface data is usually viewed and analyzed using equipment logs, serial port printing, and other methods. Ciphertext data also needs to obtain the key through other methods after communication. If specific signaling parameters are involved, the air interface data needs to be manually proofread bit by bit according to the protocol format, which has a high error rate, leading to problems such as extended equipment development cycles and difficulty in fault detection.

[0005] Chinese patent CN201585138U discloses a wireless local area network authentication and confidentiality infrastructure WAPI protocol analyzer, which uses a wireless network card working in monitoring mode and belongs to a third party outside the communicating parties. Since PWL uses MIMO technology, the air interface data transmission between the communicating parties is very purposeful and directional. If the air interface data is still obtained by third-party monitoring, it is easy to receive non-original air interface data packets with high bit error rate or even packet loss, which ultimately leads to erroneous air interface data analysis results. In addition, in the prior art, the processor, USB control chip, and wireless network card have a tight coupling relationship such as driver support, interface and operating system matching. For example, some wireless network cards must use a specific version of the driver that only supports the Windows operating system. If the processor is replaced with a Linux system, the driver needs to be re-adapted or the appropriate wireless network card needs to be replaced, which makes upgrading difficult. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a police wireless local area network air interface protocol analysis device.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A police wireless local area network air interface protocol analysis device, comprising a PWL communication module, a protocol analysis module, a password module and an antenna array;

[0009] The PWL communication module is provided with a CPU 1, an antenna interface, a data transmission interface, and an interface management module 1, wherein the antenna interface, the data transmission interface, and the interface management module 1 are all in communication connection with the CPU 1;

[0010] The protocol analysis module is provided with a CPU 2, a data receiving interface and an interface management module 2, both of which are connected to the CPU 2 for communication, and the CPU 2 is installed with PWL air interface data analysis software;

[0011] The password module is provided with a CPU 3 and an interface management module 3, and the interface management module 2 is communicatively connected with the CPU 3; the CPU 3 generates a key for encryption and decryption of PWL air interface data during the PWL communication process;

[0012] The antenna interface is connected to the antenna array, the data sending interface is communicatively connected to the data receiving interface, and the interface management module one and the interface management module two are both communicatively connected to the interface management module three.

[0013] Furthermore, the protocol analysis module also includes a storage interface, which is communicatively connected to the CPU 2 and is used to connect to a storage device.

[0014] Furthermore, the protocol analysis module also includes a display interface, which is communicatively connected to the CPU 2 and is used to connect to a display device.

[0015] Furthermore, the protocol analysis module also includes a peripheral interface, which is communicatively connected to the CPU 2 and is used to connect to an external device.

[0016] As another embodiment of the present invention, the present invention also provides a working method of the above-mentioned police wireless local area network air interface protocol analysis device, the specific process is:

[0017] A1, the CPU 1 of the PWL communication module communicates with the device under test through the antenna array, and the antenna array obtains the PWL air interface data during the communication process and transmits it to the CPU 1;

[0018] A2, CPU 1 encapsulates the acquired PWL air interface data into a general protocol message;

[0019] A3, CPU 1 sends the encapsulated general protocol message to the data receiving interface of the protocol analysis module through the data sending interface, and the data receiving interface further transmits it to CPU 2 of the protocol analysis module;

[0020] A4, CPU 1 calls the key in CPU 3 of the cryptographic module through the interface management module 1 to decrypt the acquired PWL air interface data;

[0021] A5. CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it with the key in CPU 3 and sends it to the device under test through the antenna array;

[0022] After receiving the general protocol message through the data receiving interface, B1 and CPU 2 decapsulate the general protocol message and extract the PWL air interface data;

[0023] B2, CPU 2 calls the key in CPU 3 of the cryptographic module through interface management module 2 to decrypt the PWL air interface data;

[0024] B3, CPU 2 parses and decrypts the PWL air interface data obtained according to the PWL air interface protocol format;

[0025] B4. CPU 2 displays the analysis results through a display device, and exports or saves the analysis results to a storage device.

[0026] As another embodiment of the present invention, the present invention also provides another working method of the above-mentioned police wireless local area network air interface protocol analysis device, and the specific process is:

[0027] A1, the CPU 1 of the PWL communication module communicates with the device under test through the antenna array, and the antenna array obtains the PWL air interface data during the communication process and transmits it to the CPU 1;

[0028] A2, CPU 1 calls the key in CPU 3 of the cryptographic module through the interface management module 1 to decrypt the PWL air interface data;

[0029] A3, CPU 1 encapsulates the decrypted PWL air interface data into a general protocol message;

[0030] A4, CPU 1 sends the encapsulated general protocol message to the data receiving interface of the protocol analysis module through the data sending interface, and the data receiving interface further transmits it to CPU 2 of the protocol analysis module;

[0031] A5. CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it with the key in CPU 3 and sends it to the device under test through the antenna array;

[0032] After receiving the general protocol message through the data receiving interface, B1 and CPU 2 decapsulate the general protocol message and extract the PWL air interface data;

[0033] B2, CPU 2 parses PWL air interface data according to the PWL air interface protocol format;

[0034] B3. CPU 2 displays the analysis result through a display device, and exports or saves the analysis result to a storage device.

[0035] The beneficial effects of the present invention are:

[0036] 1. The police wireless local area network air interface protocol analysis device of the present invention directly obtains the original air interface data packet as a participant in the communication, avoiding the situation where non-original air interface data packets with high bit error rate are received or even packet loss due to MIMO technology and third-party monitoring method.

[0037] 2. In the present invention, the key generated during the communication process can be reused for protocol analysis without the need to obtain the key through other means after the communication.

[0038] 3. The present invention adopts a modular design concept, and modules use a common protocol to interact with each other, solving problems such as upgrade difficulties caused by tight coupling between modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of the structure of the police wireless local area network air interface protocol analysis device in Example 1 of the present invention;

[0040] Figure 2 This is a working diagram of the PWL communication module in Embodiment 2 of the present invention;

[0041] Figure 3 This is a workflow diagram of the protocol analysis module in Example 2 of the present invention;

[0042] Figure 4 This is a working diagram of the PWL communication module in Embodiment 3 of the present invention;

[0043] Figure 5 This is a workflow diagram of the protocol analysis module in Example 3 of the present invention;

[0044] Figure 6 This is a schematic diagram of the structure of the police wireless local area network air interface protocol analysis device in Example 4 of the present invention;

[0045] Figure 7 This is a schematic diagram of the structure of the police wireless local area network air interface protocol analysis device in Example 5 of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0047] Example 1

[0048] This embodiment provides a police wireless local area network air interface protocol analysis device, such as Figure 1 As shown, it includes a PWL communication module 1, a protocol analysis module 2, a cryptographic module 3 and an antenna array 4;

[0049] The PWL communication module 1 is provided with a CPU-11, an antenna interface 12, a data transmission interface 13, and an interface management module-14, and the antenna interface 12, the data transmission interface 13, and the interface management module-14 are all connected to the CPU-11 for communication;

[0050] The protocol analysis module 2 is provided with a CPU 21, a data receiving interface 22, an interface management module 23, a storage interface 24, a display interface 25 and a peripheral interface 26. The data receiving interface 22, the interface management module 23, the storage interface 24, the display interface 25 and the peripheral interface 26 are all connected to the CPU 21 for communication. The CPU 21 is installed with PWL air interface data analysis software; the storage interface 24 is used to connect a storage device, the display interface 25 is used to connect a display device, and the peripheral interface 26 is used to connect an external device (such as a mouse, a keyboard, a USB flash drive, etc.);

[0051] The password module 3 is provided with a CPU 3 31 and an interface management module 3 32. The interface management module 2 32 is communicatively connected with the CPU 3 31. The CPU 3 31 can generate a key for PWL air interface data encryption and decryption during the PWL communication process.

[0052] The antenna interface 12 is connected to the antenna array 4 , the data sending interface 13 is communicatively connected to the data receiving interface 22 , and the interface management module 1 14 and the interface management module 2 23 are both communicatively connected to the interface management module 3 32 .

[0053] It should be noted that the PWL communication module 1 can be replaced separately according to actual test requirements. When the device under test is a PWL STA, a PWL communication module 1 with a PWL AP function is used. When the device under test is a PWL AP, a PWL communication module 1 with a PWL STA function is used. A PWL communication module 1 with both PWL AP and PWL STA communication functions can also be used, and the PWL communication module 1 can be switched according to the type of the device under test when used.

[0054] Example 2

[0055] This embodiment provides a working method of the police wireless local area network air interface protocol analysis device described in Embodiment 1, such as Figure 2-3 As shown, the specific process is:

[0056] A1, the CPU-11 of the PWL communication module 1 communicates with the device under test through the antenna array 4, and the antenna array 4 obtains the PWL air interface data during the communication process and transmits it to the CPU-11;

[0057] A2, CPU-11 encapsulates the acquired PWL air interface data into a general protocol message;

[0058] A3, CPU one 11 sends the encapsulated general protocol message to the data receiving interface 22 of the protocol analysis module 2 through the data sending interface 13, and the data receiving interface 22 further transmits it to the CPU two 21 of the protocol analysis module 2;

[0059] A4. Since PWL is encrypted communication, to determine the subsequent process, CPU 1 must first call the key in CPU 3 of the password module through interface management module 1 to decrypt the acquired PWL air interface data;

[0060] A5, CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it using the key in CPU 3 and sends it to the device under test through antenna array 4;

[0061] B1, after the CPU 21 receives the general protocol message through the data receiving interface 22, the general protocol message is decapsulated and the PWL air interface data is extracted;

[0062] B2, the PWL air interface data parsing software in the CPU 21 calls the key in the CPU 3 31 of the password module 3 through the interface management module 2 23 (this key is the same as the key in step A4), and decrypts the ciphertext that needs to be decrypted in the PWL air interface data;

[0063] B3, the PWL air interface data parsing software in the CPU 21 parses and decrypts the PWL air interface data according to the PWL air interface protocol format;

[0064] B4. The CPU 21 displays the analysis result through the display device, and exports or saves the analysis result to the storage device connected to the storage interface 24.

[0065] Example 3

[0066] This embodiment provides another working method of the police wireless local area network air interface protocol analysis device described in Embodiment 1, such as Figure 4-5 As shown, the specific process is:

[0067] A1, the CPU 1 of the PWL communication module communicates with the device under test through the antenna array, and the antenna array obtains the PWL air interface data during the communication process and transmits it to the CPU 1;

[0068] A2, CPU 1 calls the key in CPU 3 of the cryptographic module through the interface management module 1 to decrypt the PWL air interface data;

[0069] A3, CPU 1 encapsulates the decrypted PWL air interface data into a general protocol message;

[0070] A4, CPU 1 sends the encapsulated general protocol message to the data receiving interface of the protocol analysis module through the data sending interface, and the data receiving interface further transmits it to CPU 2 of the protocol analysis module;

[0071] A5. CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it with the key in CPU 3 and sends it to the device under test through the antenna array;

[0072] After receiving the general protocol message through the data receiving interface, B1 and CPU 2 use the PWL air interface data parsing software to decapsulate the general protocol message and extract the PWL air interface data;

[0073] B2, the PWL air interface data parsing software in CPU 2 parses the PWL air interface data according to the PWL air interface protocol format;

[0074] B3. CPU 2 displays the analysis result through a display device, and exports or saves the analysis result to a storage device.

[0075] Example 4

[0076] This embodiment provides an application example of Embodiments 1 and 2.

[0077] like Figure 6As shown, the device under test in this embodiment is a PWL-W AP, the PWL communication module is a PWL-W communication module, which has a PWL-W STA communication function, the main control chip CPU-11 is RK3562, and the PWL-W antenna array connected through the PWL-W antenna interface (SMA) communicates with the device under test, and uses a USB interface as a data transmission interface 13. The protocol analysis module 2 uses a development board with a main control chip CPU-21 as N4200, equipped with 8G memory and 128G eMMC, and uses a USB interface as a data receiving interface 22, a SATA interface as a storage interface, another USB interface as a peripheral interface, and a DP interface as a display interface. The SATA interface is connected to the storage device HDD, the USB interface as a peripheral interface is connected to the keyboard and mouse, the DP interface is connected to the display screen, and the CPU-21 is equipped with Wireshark software that can parse PWL-W air interface data according to the PWL-W air interface protocol format. The main control chip CPU 31 of the cryptographic module 3 is PWL01, which can generate a key for PWL-W air interface data encryption and decryption during the PWL-W communication process.

[0078] The interface management module 1 14 uses a high-speed UART interface protocol, the interface management module 2 23 uses an SPI interface protocol, and the interface management module 3 32 supports both the SPI interface protocol and the high-speed UART interface protocol.

[0079] When working, the main control chip RK3562 of the PWL-W communication module communicates with the device under test PWL-WAP through the PWL-W antenna array, obtains the PWL-W air interface data during the communication process, and encapsulates the PWL-W air interface data into a message in the USB protocol format. Then the main control chip RK3562 sends the encapsulated USB message to the USB interface of the protocol analysis module 2 as the data receiving interface through the USB interface of the PWL-W communication module. Since PWL is an encrypted communication, in order to determine the subsequent process, the main control chip RK3562 must first call the key in the main control chip PWL01 of the password module 3 through the interface management module 14 to decrypt the PWL-W air interface data. If the PWL-W air interface protocol requires no reply data, the main control chip RK3562 continues to wait for receiving subsequent PWL-W air interface data; if the PWL-W air interface protocol requires reply data, the main control chip RK3562 forms response data and encrypts it with the key in the PWL01 chip and sends it to the device under test PWL-W AP through the antenna array.

[0080] The main control chip N4200 of the protocol analysis module 2 receives the USB message sent by the PWL-W communication module through the USB interface of the protocol analysis module 2 as the data receiving interface, and then decapsulates the received USB message to extract the PWL-W air interface data. The Wireshark software on the main control chip N4200 that can parse the PWL-W air interface data calls the key in the main control chip PWL01 of the password module 3 through the interface management module 2 23 (this key is the same as the key when the main control chip RK3562 is called), decrypts the ciphertext that needs to be decrypted in the PWL-W air interface data, and parses the decrypted PWL-W air interface data according to the PWL-W air interface protocol format. Finally, the main control chip N4200 displays the analysis results on the display screen connected to the DP interface, and operates through the keyboard and mouse connected to the USB interface as the peripheral interface, and exports or saves the analysis results to the HDD hard disk connected to the SATA interface.

[0081] Example 5

[0082] This embodiment provides an application example of Embodiments 1 and 3.

[0083] like Figure 7 As shown, the device under test in this embodiment is a PWL-E STA, the PWL communication module is a PWL-E communication module, which has a PWL-E AP communication function, the main control chip CPU-11 is NL6303, and the PWL-E antenna array connected via the PWL-E antenna interface (SMA) communicates with the device under test, and uses an RJ45 interface as a data transmission interface 13. The protocol analysis module 2 uses a development board with a main control chip CPU-21 as RK3568, equipped with 4G memory and 32GeMMC, and uses an RJ45 interface as a data receiving interface 22, an HDMI interface as a display interface 25, a USB interface as a peripheral interface 26, and an M.2 interface as a storage interface 24. The M.2 interface is connected to the storage device SSD, the HDMI interface is connected to the display screen, and the USB interface is connected to the keyboard and mouse. In addition, the CPU-21 is equipped with Wireshark software that can parse PWL-E air interface data according to the PWL-E air interface protocol format. The main control chip CPU 31 of the cryptographic module 3 is PWL01, which can generate a key for PWL-E air interface data encryption and decryption during the PWL-E communication process.

[0084] The interface management module one 14, the interface management module two 23, and the interface management module three 32 all use the SPI interface protocol.

[0085] When working, the main control chip NL6303 of the PWL-E communication module communicates with the device under test PWL-ESTA through the PWL-E antenna array, obtains the PWL-E air interface data during the communication process, and then calls the key in the main control chip PWL01 of the password module through the interface management module 14 to decrypt the PWL-E air interface data, and then encapsulates the decrypted PWL-E air interface data into an Ethernet message in UDP format. The main control chip NL6303 sends the encapsulated Ethernet message to the RJ45 interface of the protocol analysis module 2 through the RJ45 interface of the PWL-E communication module. According to the requirements of the PWL-E air interface protocol, the PWL-E communication module continues to wait for the receipt of subsequent PWL-E air interface data, or forms response data and encrypts it with the key in the PWL01 chip and sends it to the device under test PWL-E STA through the antenna array.

[0086] The main control chip RK3568 of the protocol analysis module 2 receives the Ethernet message sent by the PWL-E communication module through the RJ45 interface of the protocol analysis module 2, and uses the Wireshark software that can parse the PWL-E air interface data to decapsulate the received Ethernet message and extract the PWL-E air interface data. Then, the Wireshark software that can parse the PWL-E air interface data in the main control chip RK3568 parses and decrypts the PWL-E air interface data according to the PWL-E air interface protocol format. Finally, the main control chip RK3568 displays the analysis results on the display connected to the HDMI interface, and operates through the keyboard and mouse connected to the USB interface to export or save the analysis results to the SSD hard disk connected to the M.2 interface.

[0087] When the device under test is a PWL-E AP, the PWL-E communication module can be replaced with a module with PWL-E STA communication function. At this time, the main control chip of the PWL-E communication module is NL6683, and the models of the antenna interface 12, the data transmission interface 13, and the interface management module 14 remain unchanged.

[0088] Since CPU11 is the PWL-E communication module of NL6303 which also has the PWL-E STA communication function, when the device under test is a PWL-E AP, it can also be switched to the PWL-E STA mode to achieve the same technical effect.

[0089] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. A police wireless local area network air interface protocol analysis device, characterized in that: It includes PWL communication module, protocol analysis module, cryptographic module and antenna array; The PWL communication module is provided with a CPU 1, an antenna interface, a data transmission interface, and an interface management module 1, wherein the antenna interface, the data transmission interface, and the interface management module 1 are all in communication connection with the CPU 1; The protocol analysis module is provided with a CPU 2, a data receiving interface and an interface management module 2, both of which are connected to the CPU 2 for communication, and the CPU 2 is installed with PWL air interface data analysis software; The password module is provided with a CPU 3 and an interface management module 3, and the interface management module 2 is communicatively connected with the CPU 3; the CPU 3 generates a key for encryption and decryption of PWL air interface data during the PWL communication process; The antenna interface is connected to the antenna array, the data sending interface is communicatively connected to the data receiving interface, and the interface management module one and the interface management module two are both communicatively connected to the interface management module three.

2. The police wireless local area network air interface protocol analysis device according to claim 1, characterized in that: The protocol analysis module also includes a storage interface, which is communicatively connected to the CPU 2 and is used to connect to a storage device.

3. The police wireless local area network air interface protocol analysis device according to claim 1, characterized in that: The protocol analysis module also includes a display interface, which is communicatively connected to the CPU 2 and is used to connect to a display device.

4. The police wireless local area network air interface protocol analysis device according to claim 1, characterized in that: The protocol analysis module also includes a peripheral interface, which is communicatively connected to the CPU 2 and is used to connect to an external device.

5. A working method of the police wireless local area network air interface protocol analysis device according to any one of claims 1 to 4, characterized in that: The specific process is: A1, the CPU 1 of the PWL communication module communicates with the device under test through the antenna array, and the antenna array obtains the PWL air interface data during the communication process and transmits it to the CPU 1; A2, CPU 1 encapsulates the acquired PWL air interface data into a general protocol message; A3, CPU 1 sends the encapsulated general protocol message to the data receiving interface of the protocol analysis module through the data sending interface, and the data receiving interface further transmits it to CPU 2 of the protocol analysis module; A4, CPU 1 calls the key in CPU 3 of the cryptographic module through the interface management module 1 to decrypt the acquired PWL air interface data; A5. CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it with the key in CPU 3 and sends it to the device under test through the antenna array; After receiving the general protocol message through the data receiving interface, B1 and CPU 2 decapsulate the general protocol message and extract the PWL air interface data; B2, CPU 2 calls the key in CPU 3 of the cryptographic module through interface management module 2 to decrypt the PWL air interface data; B3, CPU 2 parses and decrypts the PWL air interface data obtained according to the PWL air interface protocol format; B4. CPU 2 displays the analysis results through a display device, and exports or saves the analysis results to a storage device.

6. A working method of the police wireless local area network air interface protocol analysis device according to any one of claims 1 to 4, characterized in that: The specific process is: A1, the CPU 1 of the PWL communication module communicates with the device under test through the antenna array, and the antenna array obtains the PWL air interface data during the communication process and transmits it to the CPU 1; A2, CPU 1 calls the key in CPU 3 of the cryptographic module through the interface management module 1 to decrypt the PWL air interface data; A3, CPU 1 encapsulates the decrypted PWL air interface data into a general protocol message; A4, CPU 1 sends the encapsulated general protocol message to the data receiving interface of the protocol analysis module through the data sending interface, and the data receiving interface further transmits it to CPU 2 of the protocol analysis module; A5. CPU 1 continues to wait for receiving subsequent PWL air interface data according to the PWL air interface protocol requirements, or forms response data and encrypts it with the key in CPU 3 and sends it to the device under test through the antenna array; After receiving the general protocol message through the data receiving interface, B1 and CPU 2 decapsulate the general protocol message and extract the PWL air interface data; B2, CPU 2 parses PWL air interface data according to the PWL air interface protocol format; B3. CPU 2 displays the analysis result through a display device, and exports or saves the analysis result to a storage device.

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