CN113794715A - Virtual point-to-point network data transmitting, receiving and responding method and system thereof - Google Patents

Virtual point-to-point network data transmitting, receiving and responding method and system thereof Download PDF

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CN113794715A
CN113794715A CN202111070682.XA CN202111070682A CN113794715A CN 113794715 A CN113794715 A CN 113794715A CN 202111070682 A CN202111070682 A CN 202111070682A CN 113794715 A CN113794715 A CN 113794715A
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data
network
network interface
sending
receiving
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CN113794715B (en
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卢敏
陈燕其
赵斌
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DELTA NETWORKS (XIAMEN) Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0281—Proxies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0272—Virtual private networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/029—Firewall traversal, e.g. tunnelling or, creating pinholes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/104—Peer-to-peer [P2P] networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/34—Network arrangements or protocols for supporting network services or applications involving the movement of software or configuration parameters 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks
    • H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to a virtual point-to-point network data sending, receiving and responding method and a system thereof, wherein the sending method comprises the following steps: an initialization step: initializing and monitoring a destination port; constructing a network interface: starting a local network penetration service to establish connection with a remote server, and constructing a network interface of an LWIP bottom layer through the local network penetration service; a link generation step: sending the first application data to the destination port, calling a corresponding API of the LWIP to send the first application data to the network interface and triggering a callback function to generate network interface data; a sending step: and sending the network interface data to the remote server through the network penetration service, and the remote server analyzes the network interface data and forwards the network interface data to a corresponding receiving terminal.

Description

Virtual point-to-point network data transmitting, receiving and responding method and system thereof
Technical Field
The invention relates to the field of virtual point-to-point network communication, in particular to a virtual point-to-point network data sending, receiving and responding method and a system thereof.
Background
The Virtual Private Network (VPN) is a network that establishes a private network on a public network to perform encrypted communication, and is widely used in enterprise networks. The VPN gateway realizes remote access through encryption of the data packet and conversion of a data packet target address. A VPN may be implemented in a number of ways, including server, hardware, software, etc.
With the rapid development of the Internet technology and the coming of the Internet of things era, the management of the operating system on the authority is more and more strict. In the existing mobile terminal system, because the operating system is closed and the authority limit cannot create the virtual network card, the existing technology can only perform virtual network communication through system support protocols such as IPSec, IKEv1, OpenVPN, and the like.
The invention aims to design a virtual point-to-point network data sending, receiving and responding method and a system thereof aiming at the problems in the prior art.
Disclosure of Invention
In view of the problems in the prior art, the present invention provides a method and system for transmitting, receiving, and responding to virtual peer-to-peer network data, which can effectively solve the problems in the prior art.
The technical scheme of the invention is as follows:
a method for sending virtual point-to-point network data of mobile equipment comprises the following steps:
an initialization step: initializing and monitoring a destination port;
constructing a network interface: starting a local network penetration service to establish connection with a remote server, and constructing a network interface of an LWIP bottom layer through the local network penetration service;
a link generation step: sending the first application data to the destination port, calling a corresponding API of the LWIP to send the first application data to the network interface and triggering a callback function to generate network interface data;
a sending step: and sending the network interface data to the remote server through the network penetration service, and the remote server analyzes the network interface data and forwards the network interface data to a corresponding receiving terminal.
Further, the initializing step specifically includes initializing a home network agent service, and monitoring a destination port of the home network agent service.
Further, the link generation step specifically includes sending first application data to the destination port through an upper layer application, and after receiving the complete first application data, the destination port calls an LWIP corresponding API to send the first application data to the network interface and triggers a callback function, so as to generate network interface data.
Further, the upper layer application sends the first application data to the destination port through a standard TCP/IP protocol stack.
Further, the sending of the network interface data to the remote server by the network penetration service is specifically that the remote server parses a first link layer data frame of the network interface data to obtain a destination frame ID, and the remote server forwards the network interface data to a corresponding receiving terminal according to the destination frame ID.
Further provided is a method for receiving virtual peer-to-peer network data of a mobile device, comprising the following steps:
a receiving step: receiving network interface data forwarded by a remote server, and writing the network interface data into a local virtual network card;
and (3) analyzing: and analyzing the network interface data to obtain first application data, and transmitting the first application data to a corresponding process.
Further provided is a virtual peer-to-peer network data response method for mobile equipment, comprising the following steps:
and a response sending step: the receiving terminal processes the first application data to generate response data, the response data are reversely sent to a local penetration service of the sending terminal along an original network path through a local virtual network card of the receiving terminal, a callback function of a network interface of the sending terminal is called, and second application data are generated and sent to a destination port of the sending terminal;
and a forwarding response step: and the upper layer application receives the second application data and completes the response.
Further, the callback function of the network interface of the calling sending terminal is specifically,
calling the corresponding API of the LWIP to send the response data to the network interface of the sending terminal, and triggering a callback function.
Further, a method for data communication of a virtual peer-to-peer network of a mobile device is provided, which includes the above sending method, the above receiving method, and the above responding method.
There is further provided a mobile device virtual peer-to-peer network data communication system, comprising:
a sending module, configured to implement the sending method;
a receiving module, configured to implement the receiving method;
and the response module is used for realizing the response method.
Accordingly, the present invention provides the following effects and/or advantages:
the invention provides a virtual point-to-point network data sending method which is realized by monitoring a destination port, constructing a network interface, generating a link and sending, wherein the network interface is constructed by constructing a network interface at the bottom layer of an LWIP (light weight internet protocol) through a local network penetration service.
The invention further provides a virtual point-to-point network data receiving and sending method which is matched with the virtual point-to-point network data sending method, so that virtual point-to-point network data communication is realized.
The point-to-point virtual network technology adopted by the invention only acts on the current application and does not influence other applications of the system to use.
The data frame of the link layer generated by the LWIP protocol stack adopted by the invention can realize highly self-defined communication protocol, thereby increasing the flexibility of the system.
It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
Drawings
Fig. 1 is a schematic flow chart of the first embodiment.
FIG. 2 is a logic diagram of the first embodiment.
Fig. 3 is a schematic flow chart of the second embodiment.
FIG. 4 is a logic block diagram of the second embodiment.
Fig. 5 is a schematic flow chart of the third embodiment.
Fig. 6 is a schematic structural diagram of the fifth embodiment.
Detailed Description
To facilitate understanding of those skilled in the art, the structure of the present invention will now be described in further detail by way of examples in conjunction with the accompanying drawings:
because the operating system is closed and the authority limit cannot create the virtual network card, the prior art can only carry out virtual network communication through system support protocols such as IPSec, IKEv1, OpenVPN and the like. The following describes in detail the virtual peer-to-peer network data sending, receiving, and responding methods provided by the present invention, creating a virtual network card and completing communication functions without special authorities.
Example one
Referring to fig. 1-2, a data transmission method for a virtual peer-to-peer network of a mobile device, which is provided in this embodiment, is used to create a virtual peer-to-peer network and transmit data of a sending client to a receiving client, where the sending client and the receiving client may be a mobile device, a personal computer, an intelligent terminal, and the like, and are not limited herein. The sending method comprises the following steps:
s1, initialization step: initializing and monitoring a destination port; specifically, the home network agent service a is initialized, and the destination port of the home network agent service a is monitored. The method is mainly realized by the following codes:
Figure BDA0003260120980000051
Figure BDA0003260120980000061
in this embodiment, as used herein, the term "local web-server" may be considered and/or referred to as: the local network agent service A has the function of acting on a network user to obtain network information, is a transfer station of the network information, is an intermediate agent mechanism between a personal network and an Internet service provider, and is responsible for transferring the network information and controlling and registering the transfer; the term "port" may be considered and/or referred to as: each port corresponds to an application or service, and has a special protocol, most of which is TCPIP protocol, and some of which is UDP protocol, the selection of the specific protocol is also determined according to the characteristics of the application, and the combination of the port number and IP is equivalent to the coordinates of the desired destination. The HTTP protocol proxy server commonly uses a port number: 80/8080/3128/8081/9080.
The interception destination port refers to a kind of information record operated for the client. The port may be user-specified or preset. For example, in this embodiment, the destination port number of the listening home network proxy service a is 8080.
S2, constructing a network interface: and starting the local network penetration service B to establish connection with a remote server C, and constructing a network interface of an LWIP bottom layer through the local network penetration service B. The method is mainly realized by the following codes:
netif_set_default(netif_add(&netif,&ipaddr,&netmask,&gateway,NULL,vlncif_init,tcpip_input))；
netif_set_up(&netif)；
sys_sem_signal(sem)；
in this embodiment, as used herein, the term "local network penetration service" may be considered and/or referred to as: the local network penetration service establishes a special connection channel in the public network transit server, and aims to transmit data to a remote end without change. And starting the local network penetration service B to establish connection with the remote server C, and completing the synchronization of the encryption module. Starting the local network traversal service B to establish a connection with the remote server C is a straightforward implementation of the prior art, and the principle thereof is not described in detail herein.
In this embodiment, as used herein, the term "LWIP" may be considered and/or referred to as: LwIP is a Light Weight IP protocol that can run with or without operating system support. The network interface for constructing the LWIP bottom layer can call the following functions to realize:
netif _ add () and netif _ set _ up ().
After the network interface of the LWIP bottom layer is constructed, this embodiment further performs:
and initializing transceiving callback functions tcpip _ input and linkoutput of the network interface.
LWIP is divided into four levels: link layer, network layer, transport layer, and application layer. Wherein tcpip _ input is an input callback function, and the function submits the received data packet to the IP layer; linkoutput is an output callback function, which is used for sending an IP layer packet to a destination address, and when the IP layer sends the packet, it will traverse the linked list, find out the most suitable network interface, and call the output function registered by it to send the packet. The LWIP running device may have multiple network interfaces: an ethernet interface, a serial link interface, a loopback interface, etc. In order to realize effective management of all network interfaces, initialization of the network interfaces needs to be completed.
S3, link generation step: sending the first application data to the destination port, calling a corresponding API of the LWIP to send the first application data to the network interface and triggering a callback function to generate network interface data;
further, the link generation step specifically includes sending first application data to the destination port through an upper application standard TCP/IP protocol stack, and after receiving the complete first application data, the destination port calls an LWIP corresponding API to send the first application data to the network interface and triggers a callback function, thereby generating network interface data.
In this embodiment, as used herein, the term "link" may be considered and/or referred to as: the link is a section of path from one node to an adjacent node, and there is no other switching node in the middle, and when data communication is performed, the path between two computers is often formed by connecting a plurality of links in series.
This embodiment sends the first application data to the destination port of the home network proxy service a: 8080, in the process of sending the first application data, the method can automatically determine whether the data has been completely sent, and if not, the method continues to wait for the data without executing the subsequent steps. After receiving the complete first application data, the local network proxy service a calls the LWIP stack interface netconn _ write to generate a link layer data frame and triggers the callback function linkoutput. The link establishment between the local network proxy service a and the remote server C is completed through the link generation step. The LWIP protocol stack function is a complete internal protocol system, the LWIP internal process is always circularly operated and is mainly responsible for two functions: 1. receiving the data conversion of the application layer, sending the data to the interface of the network interface, and triggering and calling back linkoutput; 2. and receiving bottom layer drive data, calling a tcpip _ input interface and performing corresponding TCP/IP protocol stack analysis.
S4, the transmission step: and sending the network interface data to the remote server C through the network penetration service, and the remote server C analyzes the network interface data and forwards the network interface data to a corresponding receiving terminal. The method is mainly realized by the following codes:
Figure BDA0003260120980000091
further, the network penetration service sends the network interface data to the remote server C specifically, the remote server C analyzes a first link layer data frame of the network interface data to obtain a destination frame ID, and the remote server C forwards the network interface data to a corresponding receiving terminal according to the destination frame ID.
In this embodiment, before the remote server C parses the first link layer data frame of the network interface data, the callback function linkoutput is called first to encrypt the network interface data through the network penetration service, and then send the encrypted network interface data to the remote server C.
The link layer data frame is a protocol data unit of a data link layer and comprises three parts: frame header, data section, frame trailer. The frame head and the frame tail contain necessary control information, such as synchronization information, address information, error control information, and the like; the data portion includes data passed down by the network layer, such as IP packets, etc. At the transmitting end, the data link layer packages the data passed down by the network layer into frames and then transmits the frames to the link. The frame ID is important information such as address information, data type, data usage and the like, and the remote server C forwards the network interface data to the corresponding receiving terminal according to the target frame ID, completes the forwarding of the network interface data and sends the network interface data to the corresponding receiving terminal.
Through the step S1-4, the restriction of the system security authority can be effectively avoided in a manner of simulating the virtual network card based on the LWIP protocol stack, so that network data can be freely sent to the corresponding receiving terminal.
In other embodiments, when the LWIP stack function is used, the UDP mode may be used instead for the pass through communication. The interface can also be designed to encode and decode link layer data according to standard TCPIP protocol content.
Example two
Referring to fig. 3 to 4, a method for receiving virtual peer-to-peer network data of a mobile device, the receiving method provided in this embodiment, is used to control a receiving terminal to cooperate with a sending method provided in the first embodiment.
The receiving method comprises the following steps:
s5, receiving step: and receiving the network interface data forwarded by the remote server C, and writing the network interface data into the local virtual network card.
In this embodiment, as used herein, the term "virtual network card" may be considered and/or referred to as: the virtual network card can simulate the function of a HUB to realize the function of VPN, so that the system recognizes the software as a network card, and if the software has the network card, the software can be connected to the virtual HUB (HUB) to form a local area network with other computers as long as the external network can be accessed. The physical network card is used for receiving the network interface data forwarded by the remote server C. The network interface data is written into the local virtual network card, and then the network interface data can be received by the virtual network card as byte streams. In the process of receiving the first application data, the embodiment can also automatically judge whether the data is completely sent or not, and if the data is not completely received, the embodiment continues to wait for the data without executing the subsequent steps.
S6, the analyzing step: and analyzing the network interface data to obtain first application data, and transmitting the first application data to a corresponding process.
In this embodiment, the parsing step is that the virtual network card imports the network interface data into a corresponding process. The method specifically comprises the following steps: and the operating system where the receiving client is positioned analyzes and acquires the first application data according to the TCP/IP protocol stack and delivers the first application data to the corresponding process. The method is directly adopted in the prior art, is the same as the principle of constructing vpn by a virtual network card, belongs to the known means of technicians in the field, and is not specifically developed here.
EXAMPLE III
Referring to fig. 5, a virtual peer-to-peer network data responding method for a mobile device, which is a responding method provided in this embodiment, is used to control a receiving terminal and a sending terminal to cooperate with each other, so that the receiving terminal wants the sending terminal to return a data signal, and informs the sending terminal of a corresponding receiving situation, and the like.
The response comprises the following steps:
s7, response sending step: and the receiving terminal processes the first application data to generate response data, reversely transmits the response data to the local penetration service of the transmitting terminal along the original network path through the local virtual network card of the receiving terminal, calls a callback function of the network interface of the transmitting terminal, generates second application data and transmits the second application data to the destination port of the transmitting terminal.
Further, the calling back function of the network interface of the sending terminal is specifically to call the corresponding API of the LWIP to send the response data to the network interface of the sending terminal, and trigger the calling back function.
In the first embodiment, a network link is generated in the present embodiment. In this step, the local virtual network card of the receiving terminal reversely sends the response data to the local penetration service of the sending terminal along the network link generated in the embodiment, and the local penetration service calls a callback function tcpip _ input of the LWIP network interface to send a link layer data frame to the LWIP protocol stack for analysis to generate second application data, and forwards the second application data to a destination port of the local network proxy service a of the sending terminal: 8080.
s8, forwarding response step: and the upper layer application receives the second application data and completes the response.
Example four
A method for virtual peer-to-peer network data communication of a mobile device, comprising the sending method according to the first embodiment; the receiving method as in embodiment two; the response method as described in example three.
The sending client side sends data to the receiving client side through the sending method, the receiving client side receives and analyzes the data to obtain corresponding data through the receiving method, and meanwhile the receiving client side responds to the sending client side through the response method.
The specific implementation manner of this embodiment is a combination of the first, second and third embodiments, and will not be described herein again.
EXAMPLE five
A mobile device virtual peer-to-peer network data communication system, comprising:
a sending module, configured to implement the sending method according to the first embodiment;
a receiving module, configured to implement the receiving method according to embodiment two;
and the response module is used for realizing the response method in the third embodiment.
Referring to fig. 6, in the present embodiment, the sending module is a mobile device, wherein a local network proxy service a and a local network penetration service B are provided and/or integrated in the sending client, and the local network proxy service a and the local network penetration service B communicate by constructing a network interface and a link at the LWIP bottom layer and communicate with the receiving module (device terminal) by means of internet-remote server-internet.
An experiment is performed by using the communication system provided in any one of the first to fourth embodiments and/or the fifth embodiment, wherein the sending client is a mobile device, the running system software is a DIACom, the receiving client is an industrial router device, the running system software is a vlnclient, and a network interface and a link of the LWIP bottom layer are established through the DIACom software for communication. The required authority is the network authority, and the sending client and the receiving client successfully carry out virtual point-to-point network communication.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.

Claims (10)

1. A method for sending virtual point-to-point network data of mobile equipment is characterized in that: comprises the following steps:
an initialization step: initializing and monitoring a destination port;
constructing a network interface: starting a local network penetration service to establish connection with a remote server, and constructing a network interface of an LWIP bottom layer through the local network penetration service;
a link generation step: sending the first application data to the destination port, calling a corresponding API of the LWIP to send the first application data to the network interface and triggering a callback function to generate network interface data;
a sending step: and sending the network interface data to the remote server through the network penetration service, and the remote server analyzes the network interface data and forwards the network interface data to a corresponding receiving terminal.
2. The method according to claim 1, wherein the method comprises: the initializing step specifically includes initializing the home network proxy service, and monitoring a destination port of the home network proxy service.
3. The method according to claim 2, wherein the method comprises: the link generation step specifically includes that first application data are sent to the destination port through upper layer application, and after the destination port receives the complete first application data, the corresponding API of the LWIP is called to send the first application data to the network interface and trigger a callback function, so that network interface data are generated.
4. The method according to claim 3, wherein the method comprises: and the upper layer application sends the first application data to the destination port through a standard TCP/IP protocol stack.
5. The method according to claim 1, wherein the method comprises: the network penetration service sends the network interface data to the remote server specifically, the remote server analyzes a first link layer data frame of the network interface data to obtain a destination frame ID, and the remote server forwards the network interface data to a corresponding receiving terminal according to the destination frame ID.
6. A method for receiving virtual point-to-point network data of mobile equipment is characterized in that: comprises the following steps:
a receiving step: receiving network interface data forwarded by a remote server, and writing the network interface data into a local virtual network card;
and (3) analyzing: and analyzing the network interface data to obtain first application data, and transmitting the first application data to a corresponding process.
7. A virtual point-to-point network data response method for mobile equipment is characterized in that: comprises the following steps:
and a response sending step: the receiving terminal processes the first application data to generate response data, the response data are reversely sent to a local penetration service of the sending terminal along an original network path through a local virtual network card of the receiving terminal, a callback function of a network interface of the sending terminal is called, and second application data are generated and sent to a destination port of the sending terminal;
and a forwarding response step: and the upper layer application receives the second application data and completes the response.
8. The virtual peer-to-peer network data response method for the mobile device as claimed in claim 7, wherein: the callback function for calling the network interface of the sending terminal is specifically,
calling the corresponding API of the LWIP to send the response data to the network interface of the sending terminal, and triggering a callback function.
9. A method for virtual peer-to-peer network data communication of a mobile device is characterized in that: comprising the transmission method according to any one of claims 1 to 5, the reception method according to claim 6, and the response method according to any one of claims 7 to 8.
10. A mobile device virtual peer-to-peer network data communication system, characterized by: comprises the following steps:
a sending module, configured to implement the sending method according to any one of claims 1 to 5;
a receiving module for implementing the receiving method of claim 6;
a response module for implementing the response method of any one of claims 7-8.
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