CN111565130A - TCP connection detection method and system - Google Patents
TCP connection detection method and system Download PDFInfo
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- CN111565130A CN111565130A CN202010322163.7A CN202010322163A CN111565130A CN 111565130 A CN111565130 A CN 111565130A CN 202010322163 A CN202010322163 A CN 202010322163A CN 111565130 A CN111565130 A CN 111565130A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- 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
- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
Abstract
The invention discloses a TCP connection detection method and a system, relating to the technical field of communication, wherein the method comprises the following steps: when the TCP connection to be detected is successfully established, starting a detection system for detecting the TCP connection to be detected; when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records the abnormal state information of the abnormal state; when the TCP to be detected is disconnected, exporting abnormal state information and closing a detection system; wherein the detection system does not send information to the TCP connection to be detected. The invention detects different working states of the TCP connection on the premise of not influencing the normal operation of the TCP connection, and meets the working requirement of detecting the TCP connection.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a TCP connection detection method and a TCP connection detection system.
Background
TCP (Transmission Control Protocol) is a connection-oriented, reliable Transport layer (Transport layer) communication Protocol based on byte streams, and is specified by RFC 793 of IETF, and is used in the OSI model of computer networks to implement the functions specified by the Transport layer of the fourth layer. In an operator-level network, important protocols such as BGP (Border Gateway Protocol), LDP (Label Distribution Protocol) and the like rely on TCP as a reliable channel to transmit related data, and once TCP connection is broken due to various reasons, a neighbor terminal of an upper layer service Protocol, even forwarding traffic is interrupted, thereby causing a serious network operation accident; in many network device development, test networking environments, TCP upper layer protocol interruption may be caused by various reasons such as devices, networks, etc., and it is difficult to locate and repair.
In the aspect of TCP operation management, because the operation of the TCP/IP protocol is triggered by a message, unlike persistent state management of a configuration and management module, the TCP/IP protocol does not have the capability of recording details of all messages, and therefore, when the TCP is managed, monitoring needs to be performed without depending on the logic of normal operation of the TCP during monitoring management, that is, without affecting the operation of the TCP.
Based on the technical problem, a TCP connection detection scheme is provided to meet the technical requirements.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a TCP connection detection method and a TCP connection detection system, which are used for detecting different working states of TCP connection on the premise of not influencing the normal operation of the TCP connection, so that the working requirement of detecting the TCP connection is met.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
in a first aspect, the present invention discloses a TCP connection detection method, which includes the following steps:
when the TCP connection to be detected is successfully established, starting a detection system for detecting the TCP connection to be detected;
when the TCP connection to be detected is in an abnormal state meeting a recording triggering condition, the detection system records abnormal state information of the abnormal state;
when the TCP to be detected is disconnected, exporting the abnormal state information and closing the detection system; wherein the content of the first and second substances,
and the detection system does not send information to the TCP connection to be detected.
On the basis of the technical scheme, the method further comprises the following steps:
and the detection system records disconnection state information of a disconnection state and derives the disconnection state information when the TCP to be detected is disconnected.
On the basis of the technical scheme, the method further comprises the following steps:
and the detection system periodically records the working state information of the TCP connection to be detected.
On the basis of the technical scheme, when the to-be-detected TCP connection is disconnected and before the detection system is closed, the method further comprises the following steps:
and the detection system deletes the working state information.
On the basis of the technical scheme, the method further comprises a detection system establishing process, wherein the detection system establishing process comprises the following steps:
responding to the starting state of the life cycle of the TCP connection to be detected, and generating detection system generation information;
establishing the detection system according to the detection system generation information; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection mark information to be detected.
In a second aspect, the present invention further discloses a TCP connection detecting system, which includes:
the detection system establishing unit is used for detecting a detection system of the TCP connection to be detected;
the state recording unit is used for controlling the detection system to record abnormal state information of the abnormal state when the TCP connection to be detected has the abnormal state which accords with the preset recording triggering condition;
the detection system closing unit is used for exporting the abnormal state information and closing the detection system when the TCP to be detected is disconnected; wherein the content of the first and second substances,
and the detection system does not send information to the TCP connection to be detected.
On the basis of the above technical solution, the state recording unit is further configured to control the detection system to record disconnection state information of a disconnection state;
and the detection system closing unit is also used for exporting the disconnection state information when the TCP to be detected is disconnected.
On the basis of the above technical solution, the state recording unit is further configured to control the detection system to periodically record the working state information of the TCP connection to be detected.
On the basis of the above technical solution, the state recording unit is further configured to control the detection system to delete the working state information when the TCP connection to be detected is disconnected and before the detection system is closed.
On the basis of the technical scheme, the detection system establishing unit is further used for responding to the open state of the life cycle of the TCP connection to be detected and generating detection system generation information;
the detection system establishing unit is further used for establishing the detection system according to the detection system generation information; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection mark information to be detected.
Compared with the prior art, the invention has the advantages that:
the invention detects different working states of the TCP connection without influencing the normal operation of the TCP connection, and retains the detection data corresponding to the abnormal state, thereby meeting the working requirement of detecting the TCP connection.
Drawings
FIG. 1 is a flowchart illustrating steps of a TCP connection detection method according to a first embodiment of the present invention;
fig. 2 is a flowchart illustrating TCP connection establishment in a TCP connection detection method according to an embodiment of the present invention;
fig. 3 is a block diagram of a TCP connection detection system according to a second embodiment of the present invention;
in the figure: 1. a detection system establishing unit; 2. a state recording unit; 3. a system shutdown unit is detected.
Detailed Description
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a TCP connection detection method and a TCP connection detection system, which are used for detecting different working states of TCP connection on the premise of not influencing the normal operation of the TCP connection, and retaining detection data corresponding to abnormal states, so that the working requirement of detecting the TCP connection is met.
In order to achieve the technical effects, the general idea of the application is as follows:
a TCP connection detection method, comprising the steps of:
s1, when the TCP connection to be detected is successfully established, starting a detection system for detecting the TCP connection to be detected;
s2, when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records the abnormal state information of the abnormal state;
s3, when the TCP connection to be detected is disconnected, deriving abnormal state information and closing the detection system; wherein the content of the first and second substances,
the detection system does not send information to the TCP connection to be detected.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 and 2, embodiment 1 of the present invention provides a TCP connection detection method, including the following steps:
s1, when the TCP connection to be detected is successfully established, starting a detection system for detecting the TCP connection to be detected;
s2, when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records the abnormal state information of the abnormal state;
s3, when the TCP connection to be detected is disconnected, deriving abnormal state information and closing the detection system; wherein the content of the first and second substances,
the detection system does not send information to the TCP connection to be detected.
In the embodiment of the invention, when the TCP connection is established initially, the TCP connection is marked as the TCP connection to be detected, when the TCP connection to be detected is established successfully, a detection system for detecting the TCP connection to be detected is established, and the working condition of the TCP connection to be detected is detected by the detection system subsequently;
when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records the abnormal state information of the abnormal state;
when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records abnormal state information of the abnormal state, and when the TCP connection to be detected is disconnected, the abnormal state information is exported and the detection system is closed;
and when the TCP connection to be detected is in a corresponding condition, the TCP connection to be detected is regarded as working in an abnormal state, and at the moment, recording is required.
The embodiment of the invention detects and records the working condition of the TCP connection to be detected in real time on the premise of not influencing the normal work of the TCP connection to be detected, thereby ensuring that the detection work is smoothly carried out on the premise of ensuring the normal work of the TCP connection to be detected, reducing the influence on the TCP connection and improving the accuracy of the detection work.
It should be noted that the detection system does not send information to the TCP connection to be detected, thereby avoiding the influence on the TCP connection to be detected.
It should be noted that, the specific forming manner of the life cycle of the TCP connection is that the TCP client and the server simultaneously initiate the neighbor establishment, after the three-way handshake succeeds, the neighbor establishment succeeds, and after the connection establishment succeeds, the streaming data can be carried to the opposite end, and the specific flow of the three-way handshake is as follows:
first handshake: setting a flag bit SYN to 1 by the TCP client, randomly generating a value seq which is J, sending the data packet to the server, and enabling the TCP client to enter a SYN _ SENT state and wait for the server to confirm;
second handshake: after the server receives the data packet, when the TCP client requests to establish connection, the server sets flag bits SYN and ACK to be 1, wherein ACK is J +1, a value seq is randomly generated to be K, the data packet is sent to the TCP client to confirm the connection request, and the server enters a SYN _ RCVD state;
third handshake: after receiving the acknowledgement, the TCP client checks whether ACK is J +1 or not, whether ACK is 1 or not, if the ACK is correct, the flag bit ACK is 1 and K +1, the data packet is sent to the server, the server checks whether ACK is K +1 or not and whether ACK is 1 or not, if the ACK is correct, connection establishment is successful, the server and the TCP client enter an ESTABLISHED state, three-way handshake is completed, and then data transmission can be started between the server and the TCP client;
wherein, SYN _ send in fig. 2 of the drawings of the specification represents a request connection, SYN _ RCVD, i.e. SYN _ Received, i.e. synchronous reception, and ESTABLISHED is used to represent a connection success.
In another implementation manner of the embodiment of the present invention, the method further includes the following steps:
the detection system records disconnection state information of the disconnection state and derives the disconnection state information when the TCP to be detected is disconnected;
when the TCP connection to be detected is disconnected, the life cycle of the TCP connection to be detected is terminated, and the detection system records and derives the disconnection state information, so that the external equipment is informed that the TCP connection to be detected is disconnected and the life cycle is ended.
In another implementation manner of the embodiment of the present invention, the method further includes the following steps:
the detection system periodically records the working state information of the TCP connection to be detected;
and periodically acquiring the working state information so as to be capable of mastering the working condition of the TCP connection to be detected.
In another implementation manner of the embodiment of the present invention, when the TCP connection to be detected is disconnected and before the detection system is turned off, the method further includes the following steps:
and the detection system deletes the working state information.
In another implementation manner in the embodiment of the present invention, the method further includes a detection system establishment procedure, where the detection system establishment procedure includes the following steps:
responding to the opening state of the life cycle of the TCP connection to be detected, and generating detection system generation information;
establishing a detection system according to the information generated by the detection system; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection marking information to be detected.
It should be noted that the life cycle of the detection system is synchronous with the life cycle of the TCP connection to be detected, and the detection system correspond to each other one by one, so that the accuracy of the detection work is improved.
Based on the same inventive concept, the present application provides embodiments of a TCP connection detection system corresponding to the first embodiment, which is detailed in the second embodiment
Example two
Referring to fig. 3, an embodiment of the present invention provides a TCP connection detection system, including:
a detection system establishing unit 1 for detecting a TCP connection to be detected;
the state recording unit 2 is used for controlling the detection system to record abnormal state information of an abnormal state when the TCP connection to be detected has the abnormal state which accords with a preset recording triggering condition;
a detection system closing unit 3 for deriving abnormal state information and closing the detection system when the TCP to be detected is disconnected; wherein the content of the first and second substances,
the detection system does not send information to the TCP connection to be detected.
In the embodiment of the invention, when the TCP connection is established initially, the TCP connection is marked as the TCP connection to be detected, when the TCP connection to be detected is established successfully, a detection system for detecting the TCP connection to be detected is established, and the working condition of the TCP connection to be detected is detected by the detection system subsequently;
when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records the abnormal state information of the abnormal state;
when the TCP connection to be detected is in an abnormal state meeting the recording triggering condition, the detection system records abnormal state information of the abnormal state, and when the TCP connection to be detected is disconnected, the abnormal state information is exported and the detection system is closed;
and when the TCP connection to be detected is in a corresponding condition, the TCP connection to be detected is regarded as working in an abnormal state, and at the moment, recording is required.
The embodiment of the invention detects and records the working condition of the TCP connection to be detected in real time on the premise of not influencing the normal work of the TCP connection to be detected, thereby ensuring that the detection work is smoothly carried out on the premise of ensuring the normal work of the TCP connection to be detected, reducing the influence on the TCP connection and improving the accuracy of the detection work.
It should be noted that the detection system does not send information to the TCP connection to be detected, thereby avoiding the influence on the TCP connection to be detected.
It should be noted that, the specific forming manner of the life cycle of the TCP connection is that the TCP client and the server simultaneously initiate the neighbor establishment, after the three-way handshake succeeds, the neighbor establishment succeeds, and after the connection establishment succeeds, the streaming data can be carried to the opposite end, and the specific flow of the three-way handshake is as follows:
first handshake: setting a flag bit SYN to 1 by the TCP client, randomly generating a value seq which is J, sending the data packet to the server, and enabling the TCP client to enter a SYN _ SENT state and wait for the server to confirm;
second handshake: after the server receives the data packet, when the TCP client requests to establish connection, the server sets flag bits SYN and ACK to be 1, wherein ACK is J +1, a value seq is randomly generated to be K, the data packet is sent to the TCP client to confirm the connection request, and the server enters a SYN _ RCVD state;
third handshake: after receiving the acknowledgement, the TCP client checks whether ACK is J +1, whether ACK is 1, if the ACK is correct, the flag ACK is 1, and ACK is K +1, and sends the data packet to the server, the server checks whether ACK is K +1, and whether ACK is 1, if the ACK is correct, the connection establishment is successful, the server and the TCP client enter an ESTABLISHED state, a three-way handshake is completed, and then data transmission between the server and the TCP client can start.
In another implementation manner in the embodiment of the present invention, the state recording unit 2 is further configured to control the detection system to record disconnection state information of the disconnection state;
the detection system closing unit 3 is also used for exporting disconnection state information when the TCP to be detected is disconnected;
when the TCP connection to be detected is disconnected, the life cycle of the TCP connection to be detected is terminated, and the detection system records and derives the disconnection state information, so that the external equipment is informed that the TCP connection to be detected is disconnected and the life cycle is ended.
In another implementation manner in the embodiment of the present invention, the state recording unit 2 is further configured to control the detection system to periodically record the working state information of the TCP connection to be detected;
and periodically acquiring the working state information so as to be capable of mastering the working condition of the TCP connection to be detected.
In another implementation manner in the embodiment of the present invention, the state recording unit 2 is further configured to control the detection system to delete the working state information when the TCP connection to be detected is disconnected and before the detection system is closed.
In another embodiment of the present invention, the detection system establishing unit 1 is further configured to generate detection system generation information in response to an open state of a life cycle of a TCP connection to be detected;
the detection system establishing unit 1 is also used for establishing a detection system according to the detection system generation information; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection marking information to be detected.
It should be noted that the life cycle of the detection system is synchronous with the life cycle of the TCP connection to be detected, and the detection system correspond to each other one by one, so that the accuracy of the detection work is improved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A TCP connection detection method, comprising the steps of:
when the TCP connection to be detected is successfully established, starting a detection system for detecting the TCP connection to be detected;
when the TCP connection to be detected is in an abnormal state meeting a recording triggering condition, the detection system records abnormal state information of the abnormal state;
when the TCP to be detected is disconnected, exporting the abnormal state information and closing the detection system; wherein the content of the first and second substances,
and the detection system does not send information to the TCP connection to be detected.
2. The method of claim 1, further comprising the steps of:
and the detection system records disconnection state information of a disconnection state and derives the disconnection state information when the TCP to be detected is disconnected.
3. The method of claim 1, further comprising the steps of:
and the detection system periodically records the working state information of the TCP connection to be detected.
4. The method according to claim 3, wherein when the TCP connection to be detected is disconnected, before the detection system is shut down, the method further comprises the steps of:
and the detection system deletes the working state information.
5. The method of claim 1, further comprising a detection system setup procedure, the detection system setup procedure comprising the steps of:
responding to the starting state of the life cycle of the TCP connection to be detected, and generating detection system generation information;
establishing the detection system according to the detection system generation information; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection mark information to be detected.
6. A TCP connection detection system, said system comprising:
a detection system establishing unit for detecting the TCP connection to be detected;
the state recording unit is used for controlling the detection system to record abnormal state information of the abnormal state when the TCP connection to be detected has the abnormal state which accords with the preset recording triggering condition;
the detection system closing unit is used for exporting the abnormal state information and closing the detection system when the TCP to be detected is disconnected; wherein the content of the first and second substances,
and the detection system does not send information to the TCP connection to be detected.
7. The system of claim 6, wherein:
the state recording unit is also used for controlling the detection system to record disconnection state information of a disconnection state;
and the detection system closing unit is also used for exporting the disconnection state information when the TCP to be detected is disconnected.
8. The system of claim 6, wherein:
and the state recording unit is also used for controlling the detection system to periodically record the working state information of the TCP connection to be detected.
9. The system of claim 8, wherein:
and the state recording unit is further used for controlling the detection system to delete the working state information when the TCP to be detected is disconnected and before the detection system is closed.
10. The system of claim 6, wherein:
the detection system establishing unit is also used for responding to the starting state of the life cycle of the TCP connection to be detected and generating detection system generation information;
the detection system establishing unit is further used for establishing the detection system according to the detection system generation information; wherein the content of the first and second substances,
the detection system generation information comprises detection system configuration information and TCP connection mark information to be detected.
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| CN114285771A (en) * | 2021-12-30 | 2022-04-05 | 阿里巴巴（中国）有限公司 | Connection state tracking method and device of TCP connection |
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Application publication date: 20200821 |