A method of obtaining a client address at a server

Abstract

The invention discloses a method for obtaining the address of a client end at a server, comprising the following steps: a) a NAT device forwards a message, and an option of TCP type TCPOPT_SA is addedin the TCP option of an ACK message which is connected between the NAT device and the server; b) the server realizes the network monitoring type driver based on WFP, the network monitoring type driver of WFP intercepts the ACK message that establishes the TCP connection, the network monitoring type driver of WFP parses the ACK message and parses the real IP of the client from the ACK message, andthe network monitoring type driver of WFP inserts the real IP information of the client into the hash table; c) the SPI queries the real address of the corresponding socket from the network monitoring type driver of the WFP and returns the real address to the user. The application program running on the Windows server can obtain the real IP address of the client, which provides the possibility ofrealizing the information service function based on the client for the server application running on the Windows platform.

Description

technical field [0001] The invention relates to a method for obtaining a client address on a server. Background technique [0002] When the client accesses the server through the NAT device, the NAT device receives the message from the client and forwards the message to the server. In this process, the NAT device will change the source IP address and port of the message to its own IP address and port, and the remote address obtained by the server application is the IP address of the NAT device. That is, the server cannot obtain the real source IP address of the data packet forwarded by the NAT device, that is, the source IP address of the data packet; at the same time, the server application based on the TCP protocol cannot obtain the real source IP address of the data packet forwarded by the NAT device address; [0003] The present invention mainly solves the problem of how the server application program obtains the real IP address of the client under the scenario of acce...

AI Technical Summary

Problems solved by technology

That is, the server cannot obtain the real source IP address of the data packet forwarded by the NAT device, that is, the source IP address of the data packet; at the same time, the server application based on the TCP protocol cannot obtain the real source IP address of the data packet forwarded by the NAT device address;

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