CN108810124B - Remote access control system for large number of multimedia terminals in public network environment - Google Patents
Remote access control system for large number of multimedia terminals in public network environment Download PDFInfo
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- CN108810124B CN108810124B CN201810559491.1A CN201810559491A CN108810124B CN 108810124 B CN108810124 B CN 108810124B CN 201810559491 A CN201810559491 A CN 201810559491A CN 108810124 B CN108810124 B CN 108810124B
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- 238000012546 transfer Methods 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000012423 maintenance Methods 0.000 claims abstract description 18
- 230000003993 interaction Effects 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000011664 signaling Effects 0.000 claims abstract description 4
- 230000000977 initiatory effect Effects 0.000 claims abstract description 3
- 238000012545 processing Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000003139 buffering effect Effects 0.000 claims description 2
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 abstract description 3
- 238000005538 encapsulation Methods 0.000 abstract 1
- 239000000470 constituent Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
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- 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
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/22—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks comprising specially adapted graphical user interfaces [GUI]
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- 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
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
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- 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
- H04L67/14—Session management
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Abstract
The invention belongs to the technical field of network multimedia terminals, and particularly relates to a remote access control system for a large number of multimedia terminals in a public network environment. The invention comprises the following steps: the transfer proxy server is used for monitoring a specific port, receiving the connection of the media terminal, and maintaining and recording the connection state; receiving an operation request of a command operation end; the media terminal is used for responding to the remote control request, locally starting pty the pseudo terminal, constructing a shell interaction process and the like; and the terminal command line operation interface is used for initiating a control connection request, acquiring command execution output and the like. Besides, the method also comprises the step of constructing a network event driven programming framework to carry out encapsulation management on network connection, interactive signaling and control data receiving and sending. The invention realizes the remote control of a large number of terminals accessing the internet after NAT protocol in public network environment, provides a convenient and fully functional remote operation and maintenance debugging mode, can reduce the operation and maintenance cost of the system and improve the operation quality of the system.
Description
Technical Field
The invention belongs to the technical field of network multimedia terminals, and particularly relates to a remote access control system for a large number of multimedia terminals in a public network environment.
Background
The network multimedia terminal requests audio and video data from the media platform through the broadband network, provides audio and video playing service for users, is widely deployed and used, a large number of IPTV terminals and OTT terminals enter various industries, maintenance and fault treatment of the large number of network multimedia terminals become time-consuming, labor-consuming and important work, and the operation quality of the whole system is influenced. In maintenance or fault handling, in a general method, a maintainer provides manual service to a field, or a terminal reports a log for post analysis, the former is expensive, and the latter is delayed and has a limited handling mode. Therefore, it becomes necessary to provide an operation and maintenance mode capable of remotely accessing a large number of multimedia terminals deployed in a public network through a network and providing a complete control operation function, which is very helpful to improve the fault resolution capability of the system and reduce the operation and maintenance cost of the system.
Compared with a common remote access control scene, a multimedia terminal deployed in a public network is generally connected to the public network after an intranet passes through NAT, does not have an independent public network IP, cannot directly access the multimedia terminal, needs an agent mechanism for network connection, and also needs an L inux login mechanism under the agent environment to realize remote login of the multimedia terminal.
Disclosure of Invention
The invention aims to provide a remote access control system of a large number of multimedia terminals deployed on a public network, so that the network remote maintenance of the large number of multimedia terminals can be carried out, the operation and maintenance cost of the system is reduced, and the operation quality of the system is improved.
The invention relates to a general network access control method, which requires that an accessed terminal and a system operation and maintenance platform are in network intercommunication, in particular to a remote access control system which can directly access the accessed terminal through a network, and is usually deployed in an internal network on site and connected to a public network through NAT, wherein the system operation and maintenance platform cannot be directly and actively connected with the multimedia terminal through the network mode, such as telnet or ssh mode.
The remote access control system of a large number of multimedia terminals deployed on the public network provided by the invention is marked as ClearRemoteCtl, and in the system, three components are provided:
1. ClearRemoteCtl Server transfer proxy Server: a server in public network environment monitors a specific port, receives the connection of a media terminal, and maintains and records the connection state. Receiving an operation request of a command operation end, establishing a control connection channel between the command operation end and a media terminal through signaling data interaction, and transmitting remote control data through the control channel;
2. ClearRemoteCtl Stb media terminal. The transfer proxy server is connected to respond to the remote control request, locally starts pty the pseudo terminal, constructs the shell interaction process, and transfers the data of the network control channel to the standard input and standard output of the local pseudo terminal;
3. ClearRemoteCtl Interface terminal command line Interface. And the control interface used by the operation and maintenance personnel initiates a control connection request, and the requested media terminal to be operated takes the mac address as the unique identifier. After the remote control connection is established, a system command can be input by using a command line interface, and command execution output is acquired.
In order to realize remote access control, the specific flow of interaction of each module in the system is as follows:
1: the media terminal actively initiates the connection to the transfer proxy server and sends the authentication message;
2: the transfer proxy server receives the connection of the media terminal, marks the identity of the media terminal, and records the corresponding relation between the identity information and the connection information;
3: the terminal command line operates the interface terminal, initiates the connection to the transfer proxy server, sends the authentication message, and waits to be recognized and received by the transfer proxy server;
4: the terminal command line operation interface terminal sends a request to the transfer proxy server to request remote control to a certain media terminal;
5: the transfer proxy server searches the connection list of the current media terminal, finds the target media terminal and sends a request needing remote control to the target media terminal;
6: after receiving the request, the target media terminal performs the following operations:
(a) newly constructing a network connection with the transfer proxy server;
(b) opening pty a pseudo terminal and starting a shell process;
(c) in the network connection constructed in operation (a), informing the transfer server of readiness;
7: after receiving the ready message of the target media terminal, the transit proxy server temporarily creates a monitoring port (11023 and 12023), and then informs the terminal command line operation interface end of the port;
8: the terminal command line operation interface end newly initiates a network connection to connect the temporary port distributed by the upper transfer proxy server and constructs a remote control network channel; starting a command line input window, receiving user input and displaying output;
9: the transfer proxy server and the target media terminal transfer the remotely controlled network communication data, and the specific operations are as follows:
(a) at the transfer proxy server, any data sent from the terminal command line operation interface terminal is directly transferred to the network connection of the target media terminal;
(b) at the target media terminal, any data sent from the network channel of the transfer server is directly transferred to pty pseudo terminal to the shell process;
(c) at the target media terminal, any data read from the pty pseudo terminal is sent to the network channel of the transit proxy server;
(d) in the transfer proxy server, any data sent from the target media terminal is directly transferred to the network connection at the terminal command line operation interface terminal.
In order to realize network interactive communication among all the constituent modules of the system, the invention also constructs a programming framework driven by network events, wherein the functions of network connection, read-write events, timers, cross-platform and the like are encapsulated for the use of the constituent modules of the system, and the method specifically comprises the following steps:
(a) a single threaded event driven framework. The method comprises the following steps: an event pool, which monitors the event occurrence in the event pool, polls each event, and calls a call-back processing function when registering the event to process the event;
(b) and registering, canceling and calling back the network read-write event. The method comprises the following steps: establishing a package socket connection, and logging in and out of a read-write event of a network connection descriptor;
(c) and registering a timer, canceling the timer and calling back for processing. The method comprises the following steps: creating a package timer, registering, calling back a function statement, registering and the like;
(d) management of network transmission buffering. The method comprises the following steps: encapsulating tcp sending buffer control, wherein the upper layer does not need to worry about sending operation blockage caused by insufficient buffer of the bottom layer system or slow network sending;
(e) and (4) performing bottom-layer differential packaging on windows and linux platforms.
The invention combines the remote control protocol and the proxy transfer mode, realizes the remote control of a large number of terminals which surf the internet after the NAT protocol in the public network environment, and provides a convenient and complete-function remote operation and maintenance debugging mode.
The remote access control system of a large number of multimedia terminals can carry out network remote maintenance on a large number of multimedia terminals, reduce the operation and maintenance cost of the system and improve the operation quality of the system. In a practical project, the business trip rate of the implementation maintenance personnel is reduced by more than 20%, and a large amount of business trip cost is saved.
Drawings
Fig. 1 shows the basic structure of the system of the present invention.
FIG. 2 is a schematic diagram of interactive messages among the constituent modules of the system of the present invention.
Detailed Description
Specific implementations of the present invention are further described below.
In the transit proxy server, the basic data structure is to construct a set table fd _ map of transit proxy sessions. Each unit entry in the table holds a session information:
fd: a socket descriptor at the terminal command line operation interface end;
peer _ fd: a socket descriptor with the media terminal;
peer _ mac: mac of the media terminal, identity;
and (5) state: a current remote control state;
read _ buf: caching of remote control data;
the relay proxy server stores the connection information of the media terminal, the remote control session information, etc. in the table.
After the media terminal receives the request of creating remote control, the following logic is executed:
open a pty pseudo terminal:
pty = getpt()；
t = open(tty_name, O_RDWR | O_NOCTTY)；
and starting a shell process:
execv("/bin/sh")。
in a programming framework driven by network events, which is needed by three component modules of a transfer proxy server, a media terminal and an operation terminal, the following operations are packaged and realized:
initializing the Init;
mainloop, event-driven main loop;
regRead registers a network read event and call-back processing function;
unregRead, logging off a network read event;
tcpWrite: tcp non-blocking write;
registering a tcp connection request and a callback processing function;
regTimer registers a timer and callback processing function;
unregimer deregisters the timer.
The transfer proxy Server adopts general Server hardware configuration, runs the ClearRemoteCtl Server main program, binds a public network IP, and monitors 10030 signaling ports. A remotely controlled servo process is run on each media terminal to maintain a connection with the transit proxy server. And operating a terminal command line operation interface on a workstation computer of an operation and maintenance controller, wherein the terminal command line operation interface is used for initiating remote connection control and performing command interaction.
In a platform with more than 1000 media playing terminals, the remote access control system is deployed, wherein the remote access control system comprises one transit server, each media playing terminal is embedded with a servo process for access control, the hardware and implementation cost is low, but the number of business trip maintenance times is reduced greatly (by more than 20%), namely the remote access control system has a very good effect.
Claims (1)
1. A system for remote access control of a plurality of multimedia terminals deployed over a public network, the system comprising three components:
the relay proxy Server runs a ClearRemoteCtl Server main program, is a Server in a public network environment, and is used for monitoring a specific port, receiving the connection of a media terminal, and maintaining and recording the connection state; receiving an operation request of a command operation end, establishing a control connection channel between the command operation end and a media terminal through signaling data interaction, and transmitting remote control data through the control channel;
the transit proxy server constructs a transit proxy session set table fd _ map, and each unit item in the set table stores session information:
fd: a socket descriptor at the terminal command line operation interface end;
peer _ fd: a socket descriptor with the media terminal;
peer _ mac: mac address and identity of the media terminal;
and (5) state: a current remote control state;
read _ buf: caching of remote control data;
the transfer proxy server stores the connection information of the media terminal and the remote control session information in the collection table;
the media terminal does not have an independent public network IP address in a public network environment, surfs the internet after an NAT protocol, embeds and runs a servo process of access control so as to keep connecting to a transfer proxy server, responds to a remote control request by the media terminal, locally starts pty a pseudo terminal, constructs a shell interaction process, and transfers data of a network control channel to the standard input and standard output of a local pseudo terminal;
a terminal command line operation interface which is a control interface used by operation and maintenance personnel and used for initiating a control connection request, wherein the requested media terminal to be operated takes the mac address as a unique identifier; after the remote control connection is established, inputting a system command by using a command line interface, and acquiring command execution output;
the specific flow of interaction of the modules is as follows:
(1) the media terminal actively initiates the connection to the transfer proxy server and sends the authentication message;
(2) the transfer proxy server receives the connection of the media terminal, marks the identity of the media terminal, and records the corresponding relation between the identity information and the connection information;
(3) the terminal command line operates the interface terminal, initiates the connection to the transfer proxy server, sends the authentication message, and waits to be recognized and received by the transfer proxy server;
(4) the terminal command line operation interface terminal sends a request to the transfer proxy server to request remote control to a certain media terminal;
(5) the transfer proxy server searches the connection list of the current media terminal, finds the target media terminal and sends a request needing remote control to the target media terminal;
(6) after receiving the request, the target media terminal performs the following operations:
(a) newly constructing a network connection with the transfer proxy server;
(b) opening pty a pseudo terminal and starting a shell process;
(c) in the network connection constructed in operation (a), informing the transfer server of readiness;
(7): after receiving the ready message of the target media terminal, the transfer proxy server temporarily creates a monitoring port and informs the terminal command line operation interface end of the port;
(8) the terminal command line operation interface end newly initiates a network connection to connect the temporary port distributed by the upper transfer proxy server and constructs a remote control network channel; starting a command line input window, receiving user input and displaying output;
(9) the transfer proxy server and the target media terminal transfer the remotely controlled network communication data, and the specific operations are as follows:
(a) at the transfer proxy server, any data sent from the terminal command line operation interface terminal is directly transferred to the network connection of the target media terminal;
(b) at the target media terminal, any data sent from the network channel of the transfer server is directly transferred to pty pseudo terminal to the shell process;
(c) at the target media terminal, any data read from the pty pseudo terminal is sent to the network channel of the transit proxy server;
(d) at the transfer proxy server, any data sent from the target media terminal is directly transferred to the network connection at the terminal command line operation interface end;
wherein, still construct a network event driven programming frame, wherein capsulate the network connection, read and write the event, the timer, cross the platform function, for the system makes up the module to use, specifically as follows:
(a) a single threaded event driven framework comprising: an event pool, which monitors the event occurrence in the event pool, polls each event, and calls a call-back processing function when registering the event to process the event;
(b) registering, canceling and calling back a network read-write event, comprising the following steps: establishing a package socket connection, and logging in and out of a read-write event of a network connection descriptor;
(c) the timer registration, cancellation and callback processing comprise the following steps: creating a package timer, registering, calling back a function statement and registering;
(d) management of network transmit buffering, comprising: encapsulating tcp send buffer control for preventing upper layer send operation blocking caused by insufficient buffer of a bottom layer system or slow network send;
(e) and (4) performing bottom-layer differential packaging on windows and linux platforms.
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| CN110266705B (en) * | 2019-06-25 | 2020-10-02 | 珠海格力电器股份有限公司 | Control method and system |
| CN111221605B (en) * | 2019-11-18 | 2022-07-08 | 杭州安恒信息技术股份有限公司 | Method and device for controlling Windows host based on RDP protocol |
| CN111064794B (en) * | 2019-12-19 | 2022-04-15 | 浙江诺诺网络科技有限公司 | Fault detection method, device, equipment and storage medium of terminal equipment |
| CN114338632B (en) * | 2021-12-24 | 2023-09-22 | 广州通则康威智能科技有限公司 | Remote terminal control method, remote terminal control device, computer equipment and storage medium |
| CN114666628B (en) * | 2022-03-11 | 2024-03-12 | 深圳市宝泽科技有限公司 | Multimedia remote play control method, device and system |
| CN114745169A (en) * | 2022-04-06 | 2022-07-12 | 北京天融信网络安全技术有限公司 | NAT mapping-based multi-port access method, device, device, medium and product |
| CN115334151B (en) * | 2022-08-16 | 2024-05-10 | 钛信(上海)信息科技有限公司 | Cross-regional network remote host access method and system |
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