CN117097822B - Method, system and storage medium for stream type recombination network data package - Google Patents
Method, system and storage medium for stream type recombination network data package Download PDFInfo
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- CN117097822B CN117097822B CN202311352993.4A CN202311352993A CN117097822B CN 117097822 B CN117097822 B CN 117097822B CN 202311352993 A CN202311352993 A CN 202311352993A CN 117097822 B CN117097822 B CN 117097822B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005215 recombination Methods 0.000 title abstract description 16
- 230000006798 recombination Effects 0.000 title abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 17
- 239000000284 extract Substances 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 3
- 230000008521 reorganization Effects 0.000 abstract description 21
- 238000001514 detection method Methods 0.000 abstract description 13
- 238000012544 monitoring process Methods 0.000 abstract description 6
- 239000000872 buffer Substances 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005314 correlation function Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 239000012464 large buffer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- H04L69/22—Parsing or analysis of headers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
- H04L49/9057—Arrangements for supporting packet reassembly or resequencing
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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
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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- 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
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The invention relates to the technical field of network monitoring and discloses a method, a system and a storage medium for stream type recombination of network data packets, wherein the method, the system and the storage medium are used for acquiring the data packets, extracting relevant information and serial numbers of the data packets, mounting the relevant information and the serial numbers into a list according to the serial numbers, and generating a processing notice at the same time; generating a call instruction according to the processing notice; finding out the data packet with the correct sequence number from the list according to the calling instruction, and extracting and restoring the data packet to obtain effective data; therefore, the limitation of block type cache is avoided, the memory occupation of a large number of data packets is reduced, the connected content in different data packets is completely restored, the detection success rate of the analysis module is improved, meanwhile, the analysis module can acquire the flow reorganization module through a calling interface when in need, the use mode of other modules for reorganizing and restoring data is simplified, and the delay of a restoring result is reduced.
Description
Technical Field
The invention relates to the technical field of network monitoring, in particular to a method, a system and a storage medium for stream type recombination of network data packets.
Background
In the fields of network monitoring and network security, it is generally required to acquire a data packet of a network layer, perform stream reassembly, restore the data stream, and then perform detection and other processes. Because the data packet is acquired in a third-party monitoring mode at the network layer, the flow recombination of the data packet is not in the conventional processing flow of the network protocol stack of the operating system and cannot depend on the functions of the operating system. A detection program or device is required to independently handle the stream reassembly process of the data packet.
In general, existing packet restoration detection is based on data reassembly and restoration of block-type stream reassembly, such as open-source network security detection software snort, surica, zeek, and other closed-source detection systems described in the disclosure. Specifically, there are two implementation manners, the first way, single packet processing: only single packet detection is carried out on the data packet, and content and detection are restored only in the data packet; second, block-type stream reorganization: the method comprises the steps of recombining and assembling a plurality of data packets into a buffer area, then performing restoration and detection operation in the buffer area, wherein the disadvantage of single packet processing is that restoration content is incomplete, and detection cannot be completed when the restoration content spans a plurality of data packets, and the disadvantage of block type stream recombination is that: the buffer area consumes a large amount of memory, and the reduced content is incomplete due to memory limitation, so that detection fails.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a method, a system and a storage medium for stream recombination of network data packets.
In order to achieve the above object, the present invention provides the following technical solutions:
a method of streaming a reassembled network packet comprising the steps of:
s1, acquiring a data packet, extracting related information and a serial number of the data packet, mounting the data packet and the serial number into a list according to the serial number, and generating a processing notice at the same time;
s2, generating a calling instruction according to the processing notice;
s3, finding the data packet with the correct sequence number from the list according to the calling instruction, and extracting and restoring the data packet to obtain effective data.
In the present invention, preferably, in step S1, the data packet is acquired while the list is determined, whether the list storage data exceeds the configuration length is determined, if not, the relevant information corresponding to the data packet is mounted to the corresponding position of the list according to the serial number, otherwise, the data packet is discarded.
In the present invention, preferably, the corresponding data call instruction is the first length and the serial number of the data to be acquired by the parsing module.
In the present invention, preferably, in step S3, the method specifically further includes the following steps:
s31, acquiring the serial number of the first data packet on the list, judging whether the serial number is correct, if so, carrying out the next step, otherwise, returning to the reading failure;
s32, extracting reduced effective data from the first data packet according to the first length, and returning the reduced effective data to the analysis module.
In the present invention, preferably, in step S32, the method specifically further includes the following steps:
s33, judging whether the data length corresponding to the first data packet is larger than the first length, if so, directly extracting and restoring the effective data with the first length from the first data packet to an analysis module, otherwise, carrying out the next step;
s34, continuously acquiring the data packet corresponding to the next correct serial number from the list, judging whether the sum of the data length in the data packet and the data length in the first data packet is larger than the first length, if so, extracting and restoring the effective data of the first length in the data packet corresponding to the correct serial number to the analysis module, and if so, continuously acquiring the data in the data packet corresponding to the next correct serial number.
In the present invention, preferably, in step S34, if the sequence number of the next packet is not within the required range of the parsing module, the valid data extracted and restored from the first packet is directly returned to the parsing module.
In the invention, preferably, if the serial number on the list is incorrect, a restoration failure instruction is returned, and when the next data packet arrives, a call instruction is generated again to acquire, if the next acquisition is incorrect, the next acquisition is tried, and when the serial number is still incorrect after repeating for N times, the analysis module enters an error processing flow, and the current call instruction fails.
In the present invention, preferably, if the stream reorganization module successfully extracts and returns the reduced valid data to the parsing module, the stream reorganization module deletes the related information and the serial number corresponding to the current data packet from the list to make a list space free.
The system for stream recombination network data package comprises a stream recombination module and an analysis module, wherein the analysis module is connected with the recombination module through a data calling interface, the stream recombination module acquires the data package through a correlation function inlet, extracts the correlation information, the data length and the serial number of the data package, mounts the correlation information and the data length of the data package into a list according to the serial number, and extracts and restores effective data in the data package to be transmitted to the analysis module according to the requirement of the analysis module.
A storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of the method as described above.
Compared with the prior art, the invention has the beneficial effects that:
the method of the invention obtains the serial numbers and the related information of the data packets by adopting the stream reorganization module, mounts the serial numbers and the related information into the list, manages the data packets by the list, when the analysis module needs, the stream reorganization module finds the data packets with correct serial numbers for reorganization and restoration, then deletes the information of the reorganized and restored data packets in the list, and updates the list in time without independently storing the data packets, thereby avoiding the limitation of block cache, reducing the memory occupation of a large number of data packets, completely restoring the connected content in different data packets, improving the detection success rate of the analysis module, and simultaneously obtaining the data packets from the stream reorganization module by calling interfaces when the analysis module needs, simplifying the use mode of other modules on reorganization and restoration data, and reducing the delay of restoration results.
Drawings
Fig. 1 is a flow chart of a method for reassembling network packets according to the present invention.
Fig. 2 is a schematic flow chart of acquiring a data packet in a method for stream-type reorganizing network data packets according to the present invention.
Fig. 3 is a schematic flow chart of extracting effective data in a method for stream-type reorganizing network data packets according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
When the data packet is transmitted to the stream reorganization module, the data packet information is managed by a list, when the analysis module needs data, the stream reorganization module extracts and restores the data in the corresponding data packet according to the list in time and transmits the restored data to the analysis module through a calling interface, the restored data packet corresponding information is deleted from the list, then a new data packet is acquired, the data packet is continuously acquired in a form of one data stream through list management, extraction, restoration and deletion, the restoration data is continuously extracted, then the release is continuously deleted, and a large buffer block is not needed to buffer the restored data, and meanwhile, the problems of limitation and delay of the size of the block reorganization restoration data are avoided.
The following will specifically describe the above process with reference to fig. 1, and the wireless communication method of the present application mainly includes the following steps:
s1, acquiring a data packet, extracting related information and a serial number of the data packet, mounting the data packet and the serial number into a list according to the serial number, and generating a processing notice at the same time;
s2, generating a calling instruction according to the processing notice;
s3, finding the data packet with the correct sequence number from the list according to the calling instruction, and extracting and restoring the data packet to obtain effective data.
Specifically, the stream reorganization module is a part of a network monitoring and network security monitoring system, and is used for reorganizing and restoring an acquired data packet stream into complete and correct application layer data for use by a subsequent analysis module and other modules, the data packet is transmitted through a related function inlet of the stream reorganization module, related information and serial numbers of the data packet are firstly extracted, wherein the related information comprises data length and five-tuple information, the related information is mounted in a list in sequence according to the serial numbers, the related information and the like are stored in the list as catalogues, when the catalogues are acquired in the list, the limitation of the length is equivalent to acquiring the data packet, so that the list is judged while the data packet is acquired, whether the stored data of the list exceeds the configuration length is judged, if the stored data does not exceed the configuration length, the related information corresponding to the data packet is stored in the corresponding position of the list according to the serial numbers, and the configuration exceeds the configuration length of the column, the data packet is directly returned to fail, so that excessive resources are not occupied.
In this embodiment, when a data packet arrives, the flow reorganization module sends a processing notification to the analysis module, and after the analysis module obtains the notification to process the data of the corresponding data packet, a corresponding data call instruction is initiated to the flow reorganization module, where the corresponding data call instruction includes five-tuple information, a first length of data, and a serial number corresponding to the data packet that needs to be acquired by the analysis module.
In this embodiment, the call interface is a data call interface provided by the flow reassembling module to the parsing module, through which the parsing module obtains valid data to be parsed, and when the parsing module sends a call instruction to the call interface, the flow reassembling module begins to reassemble and restore the data packet.
In this embodiment, after receiving the call instruction, the flow reorganizing module specifically further includes the following steps:
s31, acquiring the serial number of the first data packet on the list, judging whether the serial number is correct, if so, carrying out the next step, otherwise, returning to the reading failure;
s32, extracting reduced effective data from the first data packet according to the first length, and returning the reduced effective data to the analysis module.
In this embodiment, in step S32, the method specifically further includes the steps of:
s33, judging whether the data length corresponding to the first data packet is larger than the first length, if so, directly extracting and restoring the effective data with the first length from the first data packet to an analysis module, otherwise, carrying out the next step;
s34, continuously acquiring the data packet corresponding to the next correct serial number from the list, judging whether the sum of the data length in the data packet and the data length in the first data packet is larger than the first length, if so, extracting and restoring the effective data of the first length in the two data packets to the analysis module, and if not, continuously acquiring the data in the data packet corresponding to the next correct serial number.
In this embodiment, in step S34, if the sequence number of the next packet is not within the required range of the parsing module, the valid data extracted and restored from the first packet is directly returned to the parsing module.
Specifically, after receiving the call instruction, the stream reorganization module firstly acquires related information and sequence numbers of the first data packets on the list according to the call instruction, firstly judges whether the sequence numbers are correct, if the sequence numbers are incorrect, indicates that the acquired data packets are disordered or lost, directly returns to the analysis module to fail in reading this time, and waits for the analysis module to be notified to try to acquire next time, thereby avoiding detection failure caused by different requirements of the early-stage restored content and the analysis module.
If the serial number is correct, the data of the current data packet is reasonable data, namely the data packet which needs to be recombined and restored, and the data in the corresponding data packet is extracted according to the serial number; when the data is extracted, the data length is required to be judged, the first length of the data sent by the analysis module is the required data length, whether the data length in the corresponding data packet exceeds the first length is judged, if yes, the effective data with the first length is extracted in the data packet and then returned to the analysis module, if not, the sequence number and related information of the next data packet are continuously acquired in the list, the corresponding data packet with the correct sequence number is selected, the data length in the data packet is judged, until the sum of the data lengths in the data packet corresponding to the acquired correct sequence number reaches the first length, namely, the data is complete, the corresponding effective data is acquired, and the effective data is returned to the analysis module after being sequenced, restored and recombined according to the sequence number; if the sequence number corresponding to the subsequent data packet is incorrect or no redundant data packet exists, effective data in the data packet corresponding to the correct sequence number is extracted, restored and returned to the analysis module, the analysis module calculates the residual data length when the effective data received by the analysis module is smaller than the first length, and the residual data length is obtained after receiving the next processing notification.
In this embodiment, according to the call instruction, if the serial number on the list is incorrect, a restoration failure instruction is returned, and when the next data packet arrives, the next data packet is acquired according to the call instruction again, if the next acquisition is incorrect, the next acquisition is attempted, and if the serial number is still incorrect after repeating N times, the parsing module enters an error processing flow, the current call instruction fails, the link corresponding to the call instruction is wrong, the processing is not performed, and the parsing module generates a new call instruction.
In this embodiment, if the stream reorganization module successfully extracts and returns the reduced valid data to the parsing module and the extraction of the valid data in the corresponding data packet is completed, the stream reorganization module deletes the related information and the serial number corresponding to the current data packet from the list to free the list space, avoid occupying resources, and free space for the next incoming data packet.
The system for stream recombination network data package includes stream recombination module and analysis module, the analysis module is connected with the recombination module by means of data calling interface, the stream recombination module can obtain data package by means of related function inlet, extract related information, data length and serial number of data package, store the related information and data length of data package into list according to serial number, according to analysis module requirement stream recombination module can extract effective data in data package, restore and recombine them into complete correct application layer data, transfer them into analysis module, analysis module can make protocol analysis and detection treatment for effective data.
Specifically, the stream reorganization module mainly reorganizes and restores the data packet, and provides a calling interface for the analysis module, so that the analysis module obtains application layer data according to the data length through the calling interface, wherein the stream reorganization module manages the data packet by using a list, and mounts the new data packet related information and the serial number into the list, and timely deletes the extracted and restored data packet related information from the list without limitation of block cache, thereby reducing memory occupation of a large number of data packets, completely restoring session connection content, improving detection success rate, simplifying use modes of other modules on reorganizing and restoring data, and reducing delay of restoring results.
In further preferred embodiments of the present invention, a storage medium is provided, characterized in that a computer program is stored, which, when being executed by a processor, causes the processor to carry out the steps of the method as described above.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (8)
1. A method for streaming and reassembling network data packets, comprising the steps of:
s1, acquiring a data packet, extracting related information and a serial number of the data packet, mounting the data packet and the serial number into a list according to the serial number, and generating a processing notice at the same time;
s2, generating a calling instruction according to the processing notice, wherein the calling instruction is a first length and a serial number of data to be acquired by the analysis module;
s3, finding the data packet with the correct sequence number from the list according to the calling instruction, extracting and restoring the data packet to obtain effective data,
in step S3, the method specifically further includes the following steps:
s31, acquiring the serial number of the first data packet on the list, judging whether the serial number is correct, if so, carrying out the next step, otherwise, returning to the reading failure;
s32, extracting reduced effective data from the first data packet according to the first length, and returning the reduced effective data to the analysis module.
2. The method according to claim 1, wherein in step S1, the list is determined while the data packet is acquired, whether the stored data in the list exceeds the configuration length is determined, if not, the relevant information corresponding to the data packet is mounted to the corresponding position of the list according to the serial number, otherwise, the data packet is discarded.
3. The method of streaming and reassembly of a network packet according to claim 2, further comprising the steps of:
s33, judging whether the data length corresponding to the first data packet is larger than the first length, if so, directly extracting and restoring the effective data with the first length from the first data packet to an analysis module, otherwise, carrying out the next step;
s34, continuously acquiring the data packet corresponding to the next correct serial number from the list, judging whether the sum of the data length in the data packet and the data length in the first data packet is larger than the first length, if so, extracting and restoring the effective data of the first length in the data packet corresponding to the correct serial number to the analysis module, and if so, continuously acquiring the data in the data packet corresponding to the next correct serial number.
4. A method according to claim 3, wherein in step S34, if the sequence number of the next packet is not within the required range of the parsing module, the parsing module is directly returned to extract the recovered valid data from the first packet.
5. The method of claim 1, wherein if the sequence number on the list is incorrect, returning a restore failure instruction, and when the next data packet arrives, generating a call instruction again to acquire, if the call instruction is incorrect, attempting to acquire next time, and repeating N times, and if the sequence number is still incorrect, then entering an error processing flow by the parsing module, and disabling the current call instruction.
6. The method of claim 1, wherein if the stream reorganizing module successfully extracts and returns the reduced valid data to the parsing module, the stream reorganizing module deletes the related information and the sequence number corresponding to the current data packet from the list to make the list space.
7. The system for implementing the method for stream reorganizing network data packet according to any one of claims 1 to 6, comprising a stream reorganizing module and an parsing module, wherein the parsing module is connected with the reorganizing module through a data calling interface, the stream reorganizing module obtains a data packet through a related function entry, extracts related information, a data length and a serial number of the data packet, mounts the related information and the data length of the data packet into a list according to the serial number, and extracts effective data in a restored data packet according to the requirement of the parsing module and transmits the effective data to the parsing module.
8. A storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of a method of streaming reorganising network packets as claimed in any one of claims 1 to 6.
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