Socks5 introduction
If your computer has a legitimate Internet IP address, or if you use your computer's modem to dial up the Internet and can freely communicate with any host on the Internet, you generally don't need to care about the Socks5 protocol.
The Socks5 protocol is useful for machines in the internal network that need to access the outside world through some machines in the network that can connect to the outside Internet. Socks5 is a proxy protocol. It acts as an intermediary between the front-end machine and the server machine that uses TCP/IP protocol to communicate, so that the front-end machine in the Intranet can access the server in the Internet network, or make the communication more secure. The Socks5 server simulates the behavior of a front end by forwarding requests from the front end to the actual target server. Here, the front end and Socks5 also communicate over TCP/IP. The front end sends the request intended for the real server to the Socks5 server, which then forwards the request to the real server. The Socks5 server makes no changes to the request itself as it passes the communication request to the real server. The Socks5 server receives the response from the real server and forwards it to the front end. Therefore, Socks5 protocol is a proxy protocol, can adapt to a variety of TCP/ IP-based application layer protocols, is almost universal. Although it can not understand the internal structure of the data it forwards, it can faithfully forward the communication packet and complete the function of the protocol.
Different from Socks5 protocol, HTTP proxy is carried out through HTTP protocol. The HTTP proxy server software understands the internal structure of the communication packet and carries out some program modification and transformation of the communication in the process of forwarding. Unlike the HTTP proxy protocol, Socks5 is actually a transport layer proxy protocol.
We can imagine that if each specific application layer protocol had to be designed to represent the corresponding proxy protocol, a particular proxy server would not be able to support so many emerging protocols anyway. Therefore, it can be said that the emergence of Socks5 alleviates the difficult situation that a variety of specific agreements need to be specially designed agency agreements. However, not all the software using the application protocol based on TCP/IP protocol can unconditionally communicate through the Socks5 server, but also requires that the front-end software itself has a Socks5 interface, in order to use the Socks5 proxy server. A front-end that supports the Socks5 protocol typically has two running states:
1. Direct communication status. The Socks5 interface is not used. This communication is directed to the final server.
2. Socks5 status. The Socks5 interface is used to send the request that would otherwise go to the final server to the Socks5 server. During the initial session between the front-end and the Socks5 server, the front-end tells the Socks5 server about the IP address and port information of the final server, so the Socks5 server can faithfully start the communication process with the final server according to the requirements of the front-end.
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