CN102404279B - Accurate judging method and system of moving distance in network - Google Patents
Accurate judging method and system of moving distance in network Download PDFInfo
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- CN102404279B CN102404279B CN201010276998.XA CN201010276998A CN102404279B CN 102404279 B CN102404279 B CN 102404279B CN 201010276998 A CN201010276998 A CN 201010276998A CN 102404279 B CN102404279 B CN 102404279B
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Abstract
An accurate judging method of moving distance in a network includes: a server side periodically sends messages containing server side time to a client side so as to update client side time; the client end sends a first moving message to the server side, and a server obtains a first delay according to the server side time and the client side time in the first moving message; the client side sends a second moving message to the server, and the server obtains a second relay according to the server side time and client side time in the second moving message; the client side moves a distance within the time interval between the first moving message and the second moving message, and when the distance is the same as the position interval within the time interval of the client side, the moving distance is correct; and otherwise, the moving distance is incorrect. The invention further discloses an accurate judging device of moving distance in the network. By means of the accurate judging method and the system of moving distance in the network, moving distance is accurately judged, and limitations and insecurities in existence are avoided.
Description
Technical field
The present invention relates to networking technology area, more specifically, relate to accurate judging method and the system of displacement in a kind of network.
Background technology
Online game is divided into client and server end.In client, when player is moved, by comprise the position of player, moving direction, translational speed and movement the mobile messaging of time of origin be sent to server end.Server end judges the correctness of player shift position according to following technical proposals, uses cheating software change data bag content to avoid player.
Such as, see Fig. 1, upper reference axis is client time reference axis, and lower reference axis is server-end time reference axis.When represented by dotted arrows does not have a network delay, client sends mobile messaging to server end at Tc1, and server end receives this mobile messaging at Tc1; When solid line represents and has network delay, client sends mobile messaging to server end at Tc1, and server end receives this mobile messaging at Ts1, and client time delay equals Ts1-Tc1.
Client sends the first mobile messaging at Tc1 to server end, and Tell server end player move from the position of range coordinate point of origin P c1, and moving direction to the right, translational speed is 100 pixels/second; Client sends the second mobile messaging at Tc2 to server end, and Tell server end player move from the position of range coordinate point of origin P c2, and moving direction upwards, translational speed is 100 pixels/second.Have for not using the client of cheating software: Pc2 equals the distance sum of Pc1 and movement within the Tc2-Tc1 time, i.e. Pc2=Pc1+(Tc2-Tc1) * 100 pixels/second.
But due to network delay, server end receives mobile message corresponding to the first mobile messaging at Ts1, and server end receives mobile message corresponding to the second mobile messaging at Ts2.If client does not use cheating software, then player client (Tc2-Tc1) in the time interval distance of movement equal the distance of player in server end (Ts2-Ts1) movement.In first message, Pc1 is correct, according to translational speed in the first message, has Pc2=Pc1+(Tc2-Tc1) * 100=Ps1+(Ts2-Ts1) * 100, known: Tc2-Tc1=Ts2-Ts1.
Can in actual application, the network delay of client and server is time to time change, and does not have fixing Changing Pattern.Such as, in fig 2, Ts1-Tc1 > Ts2-Tc2, then have Tc2-Tc1 > Ts2-Ts1.Often occur Tc2-Tc1 ≠ Ts2-Ts1, namely Tc2-Tc1 is greater than Ts2-Ts1, or Tc2-Tc1 is less than Ts2-Ts1.Therefore, player client (Tc2-Tc1) in the time interval distance of movement be not equal to the distance of player in server end (Ts2-Ts1) movement.
For this reason, server end arranges a network fluctuation error range, and the fluctuation range as proper network is 0.5 second, and Ze is Dang ∣ (Ts2-Ts1)-(during Tc2-Tc1) ∣≤0.5 second, server end judges that the movement of client player is legal.So when the translational speed of player is 100 pixels/second, the site error of client player 0.5 second * 100 pixel/second=50 pixels within, server end judges that the player position of client is correct.
When client network time delay is greater than 0.5s, server end is bound to judge that client player position is wrong; And when the time delay of client is less than or equal to 0.5s, in cheating software, utilize the difference of maximum fluctuation extreme value and the actual time delay of client, the distance of the actual movement of player can be increased.Such as, the time of client is 0.3s, maximum fluctuation extreme value is 0.5s, cheating software is utilized the time delay of notification server end client to be 0.5s, then the distance of server end player movement be 0.5 second * 100 pixel/second=50 pixels, and the distance of client player movement be 0.3 second * 100 pixel/second=30 pixels.
Visible, when arranging less maximum fluctuation extreme value, when client network situation is poor, the use of client can be affected; And larger maximum fluctuation extreme value is set, client can utilize cheating software to adjust actual displacement.In prior art there is limitation and insecurity in the judgement of Network Mobility position.
Summary of the invention
The embodiment of the present invention proposes the accurate judging method of displacement in a kind of network, under the different network condition of client, accurately judges displacement, solves limitation and the insecurity of existence.
The embodiment of the present invention also proposes the accurate judgement system of displacement in a kind of network, under the different network condition of client, accurately judges displacement, solves limitation and the insecurity of existence.
The technical scheme of the embodiment of the present invention is as follows:
An accurate judging method for displacement in network, the method comprises:
Server end periodically sends the message comprising server-end time to client, client upgrades client time according to server time;
Client sends first and moves message, and server obtains the first time delay according to server-end time and the first client time of moving in message; User end to server sends second and moves message, and server obtains the second time delay according to server-end time and the second client time of moving in message;
Whether correctly judge that client moves first the displacement that message and second moves between message according to the first time delay and the second time delay.
Described user end to server transmission second is moved message and is comprised: if the very first time is less than or equal to the threshold value pre-set, user end to server sends second and moves message;
Described second time delay is in equaling described threshold value.
Described judgement comprises:
When client, to move the distance of movement in the time interval that message and second moves message first identical with the location interval of client within the described time interval, then client moves message and the second displacement moved between message is correct first; Described distance is unequal with described location interval, and client moves message and the second displacement moved between message is wrong first.
Described renewal comprises, and is less than the server-end time in described message when client time, is then updated to the server-end time in described message client time; Otherwise described client time remains unchanged.
Describedly obtain the first time delay according to server-end time and the first client time of moving in message and comprise, described server-end time and described first client time of moving in message subtract each other and obtain described first time delay.
Describedly obtain the second time delay according to server-end time and the second client time of moving in message and comprise, described server-end time and described second client time of moving in message subtract each other and obtain described second time delay.
Described distance equals server end and receives described first and move the product that time interval and described first that message and described second moves message moves the translational speed in message.
Described location interval equals the difference that the position in message is moved in the described first position and described second of moving in message.
An accurate judgement system for displacement in network, described system comprises server end and client,
Described server end, for periodically sending the message comprising server-end time to client, obtains the first time delay according to server-end time and the first client time of moving in message; The second time delay is obtained according to server-end time and the second client time of moving in message; Whether correctly judge that client moves first the displacement that message and second moves between message according to the first time delay and the second time delay; Described client, for upgrading client time according to server time; Client sends first and moves message.
Described server end is further used for, and judges whether the first time delay is greater than the threshold value preset and arrange; Judge whether the second time delay is greater than described threshold value;
Described client is further used for, if the first time delay is less than or equal to described threshold value, then sends second to server end and moves message.
Described server end is further used for,
Whether identically with the location interval of client within the described time interval determine that client moves the distance of movement in the time interval that message and second moves message first, whether correctly judge that client moves first the displacement that message and second moves between message.
Described server end comprises, control module and judge module,
Described control module, for periodically sending the message comprising server-end time to client;
Described judge module, for obtaining the first time delay according to server-end time and the first client time of moving in message, obtain the second time delay according to server-end time and the second client time of moving in message, whether correctly judge that client moves first the displacement that message and second moves between message according to the first time delay and the second time delay.
Described judge module is further used for, and judges whether the first time delay is greater than the threshold value preset and arrange; Judge whether the second time delay is greater than described threshold value.
Described judge module is further used for, whether identically with the location interval of client within the described time interval determine that client moves the distance of movement in the time interval that message and second moves message first, whether correctly judge that client moves first the displacement that message and second moves between message.
Described client comprises, update module and sending module,
Described update module, for upgrading client time according to server time;
Described sending module, sends mobile message for client, if first move message send after the first time delay of obtaining be less than or equal to described threshold value, then user end to server sends second and moves message.
As can be seen from technique scheme, in embodiments of the present invention, server end periodically sends the message comprising server-end time to client, client upgrades client time according to server time; Ensure that the lower-delay of client time and server time.Client sends first and moves message, and server obtains the first time delay according to server-end time and the first client time of moving in message, if the first time delay is greater than the threshold value pre-set, then this judges to lose efficacy; If the first time delay is less than or equal to this threshold value, then user end to server sends second and moves message, server obtains the second time delay according to server-end time and the second client time of moving in message, if the second time delay is greater than described threshold value, then this judges to lose efficacy; If the first time delay or the second time delay are greater than this threshold value, then judge to lose efficacy.Only when the first time delay and the second time delay are all less than described threshold value, move the distance of movement in time interval that message and second moves message according to client first whether identical with the location interval of client within the described time interval, whether correctly judge that client moves first the displacement that message and second moves between message.By adjusting client time constantly, the time delay of client being judged, within the time interval, is judging the displacement of user side.Accurately effective judgement can be carried out according to the difference of network condition to the displacement of client, avoid user side to use cheating software, solve limitation and the insecurity of existence.
Accompanying drawing explanation
Fig. 1 is that client sends mobile messaging schematic diagram;
Fig. 2 is that under heterogeneous networks situation, client sends mobile messaging schematic diagram;
Fig. 3 is the schematic flow sheet of the accurate judging method of displacement in embodiment of the present invention network;
Fig. 4 is that embodiment of the present invention server end sends the schematic diagram of server time to client;
Fig. 5 is the structural representation of the accurate judgment means of displacement in embodiment of the present invention network.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, first server end periodically sends message to client, upgrades client time, make client time closer to server-end time by server-end time.Even if when network condition is poor, owing to upgrading client time constantly before in the good situation of network condition, then directly can not affect client time because of now poor network condition.The first message sent by client obtains the first time delay, if the first time delay is less than or equal to the threshold value pre-set, then client sends the second message to server end again, obtains the second time delay by the second message, judges the relation of the second time delay and threshold value.Passing threshold judges the validity of time delay, when time delay be greater than threshold value then client likely utilize cheating software participate in game, therefore time delay is greater than threshold value without the need to further judging, avoid client utilize cheating software.When the second time delay is less than or equal to threshold value, just the displacement between twice message of client is judged.And then accurately can judge that whether the displacement of client is correct, ensure that the fail safe of client and server info.
See the schematic flow sheet that accompanying drawing 3 is the accurate judging method of displacement, specifically comprise the following steps:
Step 301, renewal client time.
Server end periodically sends the message comprising server-end time to client.The numerical value in cycle is determined as the case may be, repeats no more herein.Due to network delay, this message needs through arriving client after a while.Therefore, the time of client is not consistent with server-end time.
Server end sends the message comprising server-end time first to client.After client receives this message, arranging client time is the time that server sends this message, and namely client time equals the server time in message.Client constantly receives the message with server-end time that server end sends, client specifically comprised according to server-end time renewal client time: when client time is less than the server-end time in this message, is then updated to the server-end time in described message client time; Otherwise client time remains unchanged.In the manner described above, client time=server-end time+server end is to client lower-delay.Illustrate below according to server-end time renewal client time.
Such as, be that server end sends the schematic diagram of server time to client see accompanying drawing 4, server periodically sends the message including server time to client.Cycle is set to 1 second.The server time time delay of 1 second is Tc1-1, and the server time time delay of 2 seconds is Tc2-2, and the server time time delay of 3 seconds is Tc3-3.Apparent by Fig. 4, (Tc1-1) > (Tc3-3) > (Tc2-2).
Server time 1 second, server end sent to client first and includes the server time message of 1 second, because network delay client receives this message at Tc1.Now, client time is made to equal server time in this message 1 second.
Server-end time 2 seconds, server end sent to client and includes the server time message of 2 seconds, because network delay client receives this message at Tc2.Client time now equals 1+Tc2-Tc1, and the server time in message is 2 seconds.Judge client time and the server time relation of 2 seconds.The server-end time time delay of 1 second is greater than the server end time delay of 2 seconds, i.e. (Tc1-1) > (Tc2-2), there is Tc2-Tc1<1, then there is 1+Tc2-Tc1<2, i.e. client time < server time.Adjustment client time, make client time=server time.
Server time 3 seconds, server end sent to client and includes the server time message of 3 seconds, because network delay client receives this message at Tc3.Client time now equals 2+Tc3-Tc2, and the server time in message is 3 seconds.Judge client time and the server time relation of 3 seconds.The server-end time time delay of 3 seconds is greater than the server end time delay of 2 seconds, i.e. (Tc3-3) > (Tc2-2), there is Tc3-Tc2>1, then there is 2+Tc3-Tc2>3, i.e. client time > server time.Do not adjust client time, keep client time.
Step 302, judge whether the first time delay is greater than threshold value.
Client sends first and moves message, and server obtains the first time delay according to server-end time and the first client time of moving in message, if the first time delay is greater than the threshold value pre-set, then performs step 307; Otherwise, steps performed 303.
Client sends and comprises first of client time and move message.When server end receive first move message after, server-end time and client time subtract each other and obtain the first time delay.Under normal circumstances, due to the time delay between client and server, client time is less than server-end time.If but used cheating software in client, just there will be client time would be greater than server-end time.Described server-end time and described first client time of moving in message subtract each other and obtain described first time delay.By judging whether the first time delay is greater than threshold value, distinguish that this time whether the mobile message of transmission is effective.Threshold value be greater than 0 numerical value, exact numerical values recited pre-determines according to specific circumstances, repeats no more herein.
Step 303, judge whether the second time delay is greater than threshold value.
Client sends second and moves message, and server obtains the second time delay according to server-end time and the second client time of moving in message, if the second time delay is greater than threshold value, then performs step 307; Otherwise, steps performed 304.
When server end receive second move message after, server-end time and client time subtract each other and obtain the second time delay.
Step 304, judge whether displacement equals location interval.
Judge that client moves the distance of movement in the time interval that message and second moves message first whether identical with the location interval of client within this time interval, if the same steps performed 305; If not identical, then perform step 306.
Server end receives according to record the server-end time that first moves message, receives the time that second moves message, obtain first and move the time interval that message and described second moves message with record.First translational speed and first moved in message moves message and described second time interval of moving message and obtains client moves movement in time interval that message and second moves message distance first.
Move first the primary importance coordinate that message includes client, same moves second the second place coordinate that message includes client.Client first can be calculated by primary importance coordinate and initial point according to the range formula between 2 o'clock and move position in message; Same, client second can be calculated by second place coordinate and initial point according to the range formula between 2 o'clock and move position in message.Origin is arranged according to actual needs.That is the difference that the position in message is moved in first position and second of moving in message first moves message and second and moves location interval in the time interval of message.
Step 305, judge that displacement is correct.
When client, to move the distance of movement in the time interval that message and second moves message first equal with the location interval of client within this time interval, then judge that client moves the distance of movement in the time interval that message and second moves message first correct.
Step 306, judge displacement mistake.
When client first move the distance of movement in the time interval that message and second moves message and the location interval of client within this time interval unequal, then judge that client moves the distance mistake of movement in the time interval that message and second moves message first.
Step 307, judgement lost efficacy.
When the first time delay is greater than threshold value or the second time delay is greater than threshold value, then now judge to lose efficacy.
Are structural representations of the accurate judgment means of displacement in network see accompanying drawing 5, specifically comprise:
Server end 501 comprises, control module 5012 and judge module 5011.
Control module 5011, for periodically sending the message comprising server-end time to client;
Judge module 5012, for obtaining the first time delay according to server-end time and the first client time of moving in message, judges whether the first time delay is greater than the threshold value pre-set; Obtain the second time delay according to server-end time and the second client time of moving in message, judge whether the second time delay is greater than described threshold value; Whether identically with the location interval of client within the described time interval move the distance of movement in time interval that message and second moves message according to client first, whether correctly judge that client moves first the displacement that message and second moves between message.
Client 502 comprises, update module 5021 and sending module 5022,
Update module 5021, for upgrading client time according to server time;
Sending module 5022, sends first for client and moves message, if the first time delay is less than or equal to threshold value, then user end to server sends second and moves message.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the accurate judging method of displacement in network, it is characterized in that, the method comprises:
Server end periodically sends the message comprising server-end time to client, client upgrades client time according to server time;
Client sends first and moves message, and server obtains the first time delay according to server-end time and the first client time of moving in message;
If the first time delay is greater than the threshold value pre-set, then this judges to lose efficacy;
If the first time delay is less than or equal to described threshold value, user end to server sends second and moves message, and server obtains the second time delay according to server-end time and the second client time of moving in message;
If the second time delay is greater than described threshold value, then this judges to lose efficacy;
If the second time delay is less than or equal to described threshold value, when client, to move the distance of movement in the time interval that message and second moves message first identical with the location interval of client within the described time interval, then client moves message and the second displacement moved between message is correct first; Described distance is unequal with described location interval, and client moves message and the second displacement moved between message is wrong first.
2. the accurate judging method of displacement in network according to claim 1, it is characterized in that, described renewal comprises, and is less than the server-end time in described message when client time, is then updated to the server-end time in described message client time; Otherwise described client time remains unchanged.
3. the accurate judging method of displacement in network according to claim 1, it is characterized in that, describedly obtain the first time delay according to server-end time and the first client time of moving in message and comprise, described server-end time and described first client time of moving in message subtract each other and obtain described first time delay.
4. the accurate judging method of displacement in network according to claim 1, it is characterized in that, describedly obtain the second time delay according to server-end time and the second client time of moving in message and comprise, described server-end time and described second client time of moving in message subtract each other and obtain described second time delay.
5. the accurate judging method of displacement in network according to claim 1, it is characterized in that, described distance equals server end and receives described first and move the product that time interval and described first that message and described second moves message moves the translational speed in message.
6. the accurate judging method of displacement in network according to claim 1, it is characterized in that, described location interval equals the difference that the position in message is moved in the described first position and described second of moving in message.
7. the accurate judgement system of displacement in network, it is characterized in that, described system comprises server end and client,
Described server end, for periodically sending the message comprising server-end time to client, obtains the first time delay according to server-end time and the first client time of moving in message, judges whether the first time delay is greater than the threshold value pre-set; Obtain the second time delay according to server-end time and the second client time of moving in message, judge whether the second time delay is greater than described threshold value; Whether client moves the distance of movement in the time interval that message and second moves message first identical with the location interval of client within the described time interval, whether correctly judges that client moves first the displacement that message and second moves between message;
Described client, for upgrading client time according to server time; Client sends first and moves message, if the first time delay is less than or equal to described threshold value, then user end to server sends second and moves message.
8. the accurate judgement system of displacement in network according to claim 7, it is characterized in that, described server end comprises, control module and judge module,
Described control module, for periodically sending the message comprising server-end time to client;
Described judge module, for obtaining the first time delay according to server-end time and the first client time of moving in message, judges whether the first time delay is greater than the threshold value pre-set; Obtain the second time delay according to server-end time and the second client time of moving in message, judge whether the second time delay is greater than described threshold value; Whether identically with the location interval of client within the described time interval move the distance of movement in time interval that message and second moves message according to client first, whether correctly judge that client moves first the displacement that message and second moves between message.
9. the accurate judgement system of displacement in network according to claim 7, it is characterized in that, described client comprises, update module and sending module,
Described update module, for upgrading client time according to server time;
Described sending module, sends mobile message for client, if first move message send after the first time delay of obtaining be less than or equal to described threshold value, then user end to server sends second and moves message.
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