CN106413004A - Wireless MAC sniffing scanning method and apparatus - Google Patents
Wireless MAC sniffing scanning method and apparatus Download PDFInfo
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- CN106413004A CN106413004A CN201610802925.7A CN201610802925A CN106413004A CN 106413004 A CN106413004 A CN 106413004A CN 201610802925 A CN201610802925 A CN 201610802925A CN 106413004 A CN106413004 A CN 106413004A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/50—Allocation of resources, e.g. of the central processing unit [CPU]
- G06F9/5005—Allocation of resources, e.g. of the central processing unit [CPU] to service a request
- G06F9/5027—Allocation of resources, e.g. of the central processing unit [CPU] to service a request the resource being a machine, e.g. CPUs, Servers, Terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
- H04L45/7453—Address table lookup; Address filtering using hashing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
- H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
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- Computer Networks & Wireless Communication (AREA)
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- Computer Security & Cryptography (AREA)
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a wireless MAC sniffing scanning method and apparatus. The wireless MAC sniffing scanning method comprises: S1, capturing a detection data packet sent by a terminal; S2, softly interrupting a kernel of a wireless access device; S3, caching the detection data packet in a buffer, and generating a detection data packet record; S4, ending soft interruption of the kernel of the wireless access device, and normally running the wireless access device; and S5, reading, by a preset kernel thread, the detection data packet record from the buffer, and processing the detection data packet record. A large-operand data processing process is transferred to a pre-added kernel process for processing, thereby effectively avoiding the problem of over-long occupation time of soft interruption of the kernel due to data processing.
Description
Technical field
The present invention relates to communication technical field, more particularly, to a kind of wireless MAC sniff scan method and its device.
Background technology
In radio systems, for the ease of the deployment of wireless system AP (Access Point, access points), need
Whether there is not associated AP and the wireless terminal having associated this AP near solution AP, thus providing more accurate wireless service, this
One process is accomplished by realizing by AP scan function, and typically we will be called wireless MAC (Media Access this function
Control, media access control) sniff scanning, scans the information obtaining and includes MAC Address, RSSI (Received Signal
Strength Indication, received signal strength) and bottom of making an uproar.
The scanning of wireless MAC sniff is wide by intercepting and capturing the probe req (probe requests thereby) of wireless terminal/not associated AP transmission
Broadcast bag, to obtain the information of wireless terminal/not associated AP.But what packet receiving was realized generally by soft interrupt mechanism, that is,
Often receive a bag and all can produce traps, but, in kernel, traps can not be taken for a long time.
Correspondingly produce traps if often receiving a probe req broadcast packet, then wide for probe req
Broadcast bag and directly report consumer process, although this process will not allow traps overlong time, if whole region exist a large amount of
When wireless terminal/not associated AP sends probe req broadcast packet simultaneously, kernel can be led to ceaselessly to disappear as consumer process sends
Breath；And receive the bag that probe req broadcast packet occurs that more MAC Address repeats, a large amount of MAC Address undoubtedly can be reported to repeat
Garbage, the communication port not only consuming a large amount of kernel CPU but also excessively taking between inner nuclear layer and client layer.
In addition, if often receiving a probe req broadcast packet just produce traps, then filter all middle phase of MAC
Same bag is cached to queue again, and this process will lock to queue for the concordance of data；And the lookup of data, insert, delete
Except waiting operation all will take traps duration, it is easily caused traps and extremely leads to Kernel Panic.
Content of the invention
For the problems referred to above, the invention provides a kind of wireless MAC sniff scan method and its device, efficiently solve and grab
Take kernel traps holding time long problem during probe data packet.
The technical scheme that the present invention provides is as follows：
A kind of wireless MAC sniff scan method, is applied to radio reception device, including：
S1 captures the probe data packet that terminal sends；
S2 radio reception device kernel enters traps；
Probe data packet is put into relief area and is entered row cache by S3, and generates probe data packet record；
S4 radio reception device kernel terminates traps, normal operation；
S5 presets kernel thread and is processed from relief area reading probe data packet record.
In the technical program, radio reception device grab terminal transmission probe data packet after with will its caching
Enter in relief area, rather than immediately probe data packet is processed；Afterwards, using default kernel thread to the data detecting
Bag is processed.Processed in the kernel process adding in advance that data handling procedure big for operand is transferred to, effectively
Avoid and the long problem of kernel traps holding time is led to due to data processing.
It is further preferred that specifically including in step s3, detection count off evidence being put into buffer circle and enters row cache.
In the technical program, default kernel thread and kernel traps pass through buffer circle shared data, and buffer
Area is the buffer circle of no lock, the traps program run will not be had any impact, effectively carry in radio reception device
The high stability of system.
It is further preferred that specifically including in step s 5：
S51 presets kernel thread and reads relief area, obtains probe data packet record；
The probe data packet record that S52 parsing reads, and the probe data packet record of MAC Address repetition was carried out
Filter；
The MAC Address based on probe data packet for the S53 changes kernel Hash table；
S54 report change after kernel Hash table to user's space.
In the technical program, in default kernel thread, filtration treatment is carried out to probe data packet, will be wireless with this
The kernel isolation of access device, if processing procedure goes wrong, simply presets kernel thread and goes wrong, be not result in that kernel collapses
Burst, improve the stability of system.
It is further preferred that in step S52, also parsing the background noise of probe data packet and reception in every record
Time, and launch the signal intensity of this probe data packet terminal.
It is further preferred that specifically including in step S53：
MAC Address based on probe data packet makes a look up in current inner Hash table；
If finding identical MAC Address in current inner Hash table, the signal updating the association of this MAC Address is strong
Degree, background noise and reception time；
If not finding identical MAC Address in current inner Hash table, by the MAC Address of this probe data packet,
Signal intensity, background noise and reception time form new record insertion current inner Hash table.
It is further preferred that specifically including in step S54：
In kernel Hash table after change, pre-set space is completely or default report cycle is overtime, reports kernel Hash table after change
To user's space.
Present invention also offers a kind of wireless MAC sniff scanning means, it is applied to radio reception device, including：
Packet handling module, for capturing the probe data packet of terminal transmission；
Kernel traps module, the probe data packet traps radio reception device being grabbed based on packet handling module
Kernel；
Cache module, for, after radio reception device kernel traps, data cached bag handling module detects
Probe data packet, and generate probe data packet record；
Kernel traps terminate module, after buffering into cache module in probe data packet, terminate wireless access and set
The traps of standby kernel；
Data processing module, is processed for reading probe data packet record from relief area.
In the technical program, packet handling module grab terminal transmission probe data packet after with will its delay
It is stored in cache module, rather than immediately probe data packet is processed；Afterwards, using data processing module (kernel process)
The packet detecting is processed.The data processing mould adding in advance that data handling procedure big for operand is transferred to
Processed in block (kernel process), effectively prevent and kernel long the asking of traps holding time is led to due to data processing
Topic.
It is further preferred that described cache module is a buffer circle.
In the technical program, relief area is the buffer circle of no lock, will not be soft to run in radio reception device
Interrupt routine has any impact, and effectively increases the stability of system.
It is further preferred that data processing module includes：
Data-reading unit, for reading relief area, obtains probe data packet record；
Resolve packet unit, for parsing the probe data packet record reading, obtains the MAC ground of probe data packet
Location；The analysis result of concrete probe data packet record includes：The MAC Address of probe data packet in every record, background noise and
The reception time, and launch the signal intensity of this probe data packet terminal；
Packet Filtering unit, detection number MAC Address being repeated based on the MAC Address that resolve packet unit resolves go out
Filtered according to bag record；
Hash table changing unit, changes kernel Hash table based on the MAC Address that resolve packet unit resolves go out；
Hash table reporting unit, for reporting to user's space by the kernel Hash table after change.
In the technical program, in data processing module (default kernel thread), probe data packet is carried out at filtration
Reason, with this by the kernel isolation of radio reception device, if processing procedure goes wrong, simply presets kernel thread and goes wrong,
It is not result in Kernel Panic, improve the stability of system.
It is further preferred that also including a MAC Address searching unit in data processing module, based on probe data packet
MAC Address makes a look up in current inner Hash table；
If finding identical MAC Address in current inner Hash table, Hash table changing unit updates this MAC Address
The signal intensity of association, background noise and reception time；
If not finding identical MAC Address in current inner Hash table, Hash table changing unit is by this detection number
Form new record insertion current inner Hash table according to the MAC Address of bag, signal intensity, background noise and reception time.
In the wireless MAC sniff scan method that the present invention provides and its device, in the detection data of crawl terminal transmission
Add a kernel thread in kernel before bag；Afterwards, the probe data packet grabbing directly is put in relief area and carry out
Caching；Finally, the probe data packet that default kernel thread reads in this relief area is processed to it.By data big for operand
Processed in the kernel process adding in advance that processing procedure is transferred to, effectively prevent and lead to kernel soft due to data processing
Interrupt the long problem of holding time.The kernel of radio reception device is isolated, if processing procedure goes wrong, simply in advance simultaneously
If kernel thread goes wrong, it is not result in Kernel Panic, improve the stability of system.
Brief description
Below by the way of clearly understandable, preferred implementation is described with reference to the drawings, to above-mentioned characteristic, technical characteristic,
Advantage and its implementation are further described.
Fig. 1 is wireless MAC sniff scan method schematic flow sheet in the present invention；
Fig. 2 is that in the present invention, default kernel thread processes probe data packet schematic flow sheet；
Fig. 3 is wireless MAC sniff scanning means schematic diagram in the present invention；
Fig. 4 is data processing module a kind of embodiment schematic diagram in the present invention；
Fig. 5 is data processing module another embodiment schematic diagram in the present invention.
Drawing reference numeral explanation：
100- wireless MAC sniff scanning means, 110- packet handling module, 120- kernel traps module, 130- delays
Storing module, 140- kernel traps terminate module, 150- data processing module, 151- data-reading unit, 152- packet solution
Analysis unit, 153- Packet Filtering unit, 154- Hash table changing unit, 155- Hash table reporting unit, 156-MAC looks into address
Look for unit.
Specific embodiment
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, brief description will be compareed below
The specific embodiment of the present invention.It should be evident that drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing, and obtain other embodiments.
It is illustrated in figure 1 the wireless MAC sniff scan method schematic flow sheet of present invention offer, specifically this wireless MAC is smelt
Visit scan method and be applied to radio reception device, it can be seen that including in this wireless MAC sniff scan method：S1
The probe data packet (probe req bag) that crawl terminal sends；S2 radio reception device kernel enters traps；S3 will detect number
Put into relief area according to bag and enter row cache, and generate probe data packet record；S4 radio reception device kernel terminates traps, normally
Run；S5 presets kernel thread and is processed from relief area reading probe data packet record.
Specifically, specifically include in step s3, detection count off evidence is put into buffer circle and enters row cache.By buffering
Area is the buffer circle of no lock, the traps program run will not be had any impact, effectively carry in radio reception device
The high stability of system.In addition, above-mentioned radio reception device includes wireless apss, wireless router etc., here does not limit.
In a specific embodiment, above-mentioned buffer circle be dimensioned to 512 records, every record includes
13 bytes, totally 6656 bytes；Wherein, every 13 each bytes of including of record specifically include：6 bytes of MAC Address, eventually
1 byte of signal intensity (RSSI) at end, 2 bytes of background noise (Noise Floor), (Timestamp connects to receive the time
The timestamp in time receiving) 4 bytes.In other embodiments, buffer circle can also be other sizes, is entered according to practical application
Row sets, and here does not limit.
As shown in Fig. 2 presetting kernel thread from relief area reading probe data packet record is processed in step S5, tool
Body includes：S51 presets kernel thread and reads relief area, obtains probe data packet record；The probe data packet that S52 parsing reads
Record, and the probe data packet record of MAC Address repetition is filtered；In the MAC Address based on probe data packet for the S53 changes
Core Hash table (KVHLIST)；S54 report change after kernel Hash table to user's space.
Specifically, in step S52, probe data packet record is parsed, parse probe data packet in every record
MAC Address, also include the background noise of probe data packet and reception time in every record simultaneously, and launch this detection number
Signal intensity according to bag terminal.Afterwards, the MAC Address according to probe data packet in every record was carried out to detecting bag record
Filter, by MAC Address identical record remove (MAC Address said herein refers specifically to source MAC, MAC Address identical explanation from
The probe data packet of same terminal, so effectively prevent reporting of repetition garbage, has saved resource), after being filtered
Probe data packet record.Afterwards, the MAC ground in step S53, based on every record in the probe data packet record after filtering
Location is changed to kernel Hash table, finally in step S54, the kernel Hash table after change is uploaded to user's space.At this
During one, in default kernel thread, filtration treatment is carried out to probe data packet, by the kernel isolation of radio reception device
Out, if processing procedure goes wrong, such as collapse etc., also simply default kernel thread goes wrong, and is not result in Kernel Panic,
Undoubtedly improve the stability of system.
For further, the process in step S53, kernel Hash table being changed specifically includes：Based on detection number
MAC Address according to bag makes a look up in current inner Hash table；If finding identical MAC ground in current inner Hash table
Location, then update signal intensity, background noise and the reception time of the association of this MAC Address；If in current inner Hash table not
Find identical MAC Address, then by the MAC Address of this probe data packet, signal intensity, background noise and reception time shape
The record insertion current inner Hash table of Cheng Xin.After change, pre-set space is full or default report cycle surpasses in kernel Hash table
When, after reporting change, kernel Hash table, to user's space, realizes the scanning of wireless MAC sniff.
The structural representation of the wireless MAC sniff scanning means of present invention offer, specifically this wireless MAC are provided
Sniff scanning means 100 is applied to radio reception device, it can be seen that in this wireless MAC sniff scanning means 100
Including：Packet handling module 110, kernel traps module 120, cache module 130, kernel traps terminate module 140 with
And data processing module 150, wherein, kernel traps module is connected with packet handling module 110, cache module 130 with interior
Core traps module 120 connects, and kernel traps are terminated module 140 and are connected with cache module 130, data processing module 150 with
Kernel traps terminate module 140 and connect.
In the course of the work, first, capture, using packet handling module 110, the probe data packet that terminal sends, and
Kernel traps module 120 is sent a signal to after the probe data packet grabbing；Kernel traps module 120 receives this letter
Number afterwards, traps radio reception device kernel immediately, that is, radio reception device kernel enter traps program；Then, will grab
The probe data packet got buffers into cache module 130 and generates probe data packet record；And after caching, kernel traps
Terminate the traps that module 140 terminates radio reception device kernel；Finally, data processing module 150 reads from relief area and detects
Packet data recording is processed.
Specifically, above-mentioned cache module 130 is a buffer circle, the buffer circle being no lock by relief area, no
The traps program run in radio reception device can be had any impact, effectively increase the stability of system.Above-mentioned
Data processing module 150 is a kernel thread adding in advance, is exclusively used in the probe data packet grabbing is processed.Separately
Outward, above-mentioned radio reception device includes wireless apss, wireless router etc., and here does not limit.
In a specific embodiment, above-mentioned buffer circle be dimensioned to 512 records, every record includes
13 bytes, totally 6656 bytes；Wherein, every 13 each bytes of including of record specifically include：6 bytes of MAC Address, eventually
1 byte of signal intensity (RSSI) at end, 2 bytes of background noise (Noise Floor), (Timestamp connects to receive the time
The timestamp in time receiving) 4 bytes.In other embodiments, buffer circle can also be other sizes, is entered according to practical application
Row sets, and here does not limit.
Furthermore, it is understood that being illustrated in figure 4 a kind of embodiment schematic diagram of above-mentioned data processing module 150, specifically at this
In embodiment, specifically include in this data processing module 150：Data-reading unit 151, resolve packet unit 152, number
According to packet filtering unit 153, Hash table changing unit 154 and Hash table reporting unit 155, wherein, resolve packet unit 152
It is connected with data-reading unit 151, Packet Filtering unit 153 is connected with resolve packet unit 152, Hash table changing unit
154 are connected with data-reading unit 151, resolve packet unit 152 and Packet Filtering unit 153, on Hash table respectively
Declaration form unit 155 is connected with Hash table changing unit 154.
In the course of the work, data-reading unit 151 reads relief area, obtains probe data packet record；Afterwards, packet
Resolution unit 152 parses to the probe data packet record reading, and parses the MAC ground of probe data packet in every record
Location, also includes the background noise of probe data packet and reception time in every record simultaneously, and launches this probe data packet eventually
The signal intensity at end.Afterwards, Packet Filtering unit 153 wraps to detecting according to the MAC Address of probe data packet in every record
Record is filtered, and MAC Address identical record is removed, the probe data packet record after being filtered.Then, Hash table becomes
More unit 154 is changed to kernel Hash table based on the MAC Address of every record in the probe data packet record after filtering；?
Afterwards, after Hash table reporting unit 155 will change, kernel Hash table reports to user's space.In this course, default interior
In core thread, filtration treatment is carried out to probe data packet, the kernel of radio reception device is isolated, if processing procedure occurs
Problem, such as collapse etc., also simply default kernel thread goes wrong, and is not result in Kernel Panic, undoubtedly improves the steady of system
Qualitative energy.
Above-mentioned embodiment is improved, as shown in figure 5, reading except including data in this data processing module 150
Unit 151, resolve packet unit 152, Packet Filtering unit 153, Hash table changing unit 154 and Hash table is taken to report
Outside unit 155, also include a MAC Address searching unit 156, its MAC Address based on probe data packet is breathed out in current inner
Make a look up in uncommon table.Specifically, if finding identical MAC Address, Hash table changing unit in current inner Hash table
154 signal intensity, background noise and the reception times updating the association of this MAC Address；If not looking in current inner Hash table
Find identical MAC Address, then the MAC Address of this probe data packet, signal intensity, background are made an uproar by Hash table changing unit 154
Sound and reception time form new record insertion current inner Hash table.After change, pre-set space is full in kernel Hash table
Or default report cycle time-out, after Hash table reporting unit 155 will change, kernel Hash table reports to user's space, realizes wireless
MAC sniff scans.
It should be noted that above-described embodiment all can independent assortment as needed.The above is only the preferred of the present invention
Embodiment it is noted that for those skilled in the art, in the premise without departing from the principle of the invention
Under, some improvements and modifications can also be made, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of wireless MAC sniff scan method it is characterised in that being applied to radio reception device, sweep by described wireless MAC sniff
The method of retouching includes：
S1 captures the probe data packet that terminal sends；
S2 radio reception device kernel enters traps；
Probe data packet is put into relief area and is entered row cache by S3, and generates probe data packet record；
S4 radio reception device kernel terminates traps, normal operation；
S5 presets kernel thread and is processed from relief area reading probe data packet record.
2. wireless MAC sniff scan method as claimed in claim 1, it is characterised in that specifically including in step s3, will be visited
Observe and predict data and put into buffer circle and enter row cache.
3. wireless MAC sniff scan method as claimed in claim 1 or 2 is it is characterised in that specifically include in step s 5：
S51 presets kernel thread and reads relief area, obtains probe data packet record；
The probe data packet record that S52 parsing reads, and the probe data packet record of MAC Address repetition is filtered；
The MAC Address based on probe data packet for the S53 changes kernel Hash table；
S54 report change after kernel Hash table to user's space.
4. wireless MAC sniff scan method as claimed in claim 3 is it is characterised in that in step S52, also parse every
The background noise of probe data packet and reception time in bar record, and the signal intensity launching this probe data packet terminal.
5. wireless MAC sniff scan method as claimed in claim 4 is it is characterised in that specifically include in step S53：
MAC Address based on probe data packet makes a look up in current inner Hash table；
If finding identical MAC Address in current inner Hash table, update signal intensity, the back of the body of the association of this MAC Address
Scape noise and reception time；
If not finding identical MAC Address in current inner Hash table, by the MAC Address of this probe data packet, signal
Intensity, background noise and reception time form new record insertion current inner Hash table.
6. wireless MAC sniff scan method as claimed in claim 3 is it is characterised in that specifically include in step S54：
In kernel Hash table after change, pre-set space is completely or default report cycle is overtime, and after reporting change, kernel Hash table is to use
Family space.
7. a kind of wireless MAC sniff scanning means it is characterised in that being applied to radio reception device, sweep by described wireless MAC sniff
Imaging apparatus include：
Packet handling module, for capturing the probe data packet of terminal transmission；
Kernel traps module, based in the probe data packet traps radio reception device that packet handling module grabs
Core；
Cache module, for after radio reception device kernel traps, the detection that data cached bag handling module detects
Packet, and generate probe data packet record；
Kernel traps terminate module, after buffering into cache module in probe data packet, terminate in radio reception device
The traps of core；
Data processing module, is processed for reading probe data packet record from relief area.
8. wireless MAC sniff scanning means as claimed in claim 7 is it is characterised in that described cache module is that an annular is slow
Rush area.
9. wireless MAC sniff scanning means as claimed in claim 7 or 8 is it is characterised in that data processing module includes：
Data-reading unit, for reading relief area, obtains probe data packet record；
Resolve packet unit, for parsing the probe data packet record reading, obtains the MAC Address of probe data packet；Tool
The analysis result of body probe data packet record includes：In every record when the MAC Address of probe data packet, background noise and reception
Between, and the signal intensity launching this probe data packet terminal；
Packet Filtering unit, probe data packet MAC Address being repeated based on the MAC Address that resolve packet unit resolves go out
Record is filtered；
Hash table changing unit, changes kernel Hash table based on the MAC Address that resolve packet unit resolves go out；
Hash table reporting unit, for reporting to user's space by the kernel Hash table after change.
10. wireless MAC sniff scanning means as claimed in claim 9 is it is characterised in that also include one in data processing module
MAC Address searching unit, the MAC Address based on probe data packet makes a look up in current inner Hash table；
If finding identical MAC Address in current inner Hash table, Hash table changing unit updates the association of this MAC Address
Signal intensity, background noise and receive the time；
If not finding identical MAC Address in current inner Hash table, Hash table changing unit is by this probe data packet
MAC Address, signal intensity, background noise and reception time form new record insertion current inner Hash table.
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| CN109089301B (en) * | 2018-07-19 | 2021-01-15 | 深圳云盈网络科技有限公司 | Network data processing system and method |
| CN109660957A (en) * | 2018-12-26 | 2019-04-19 | 成都科来软件有限公司 | A kind of device and method of WLAN positioning AP |
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