The SOCKS5 proxy looks complicated, but it is only one of the proxy IP protocols, and it is also the most important and popular protocol. Only the proxy IP of the SOCKS5 protocol can implement true anonymous proxy, without which all high anonymous proxy IP will be invalid.
SOCKS5 is a proxy protocol, which plays an intermediary role between the front-end machine and the server machine using TCP/IP protocol to communicate, so that the front-end machine in the Intranet can access the server in the Internet network, so that the communication is 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 packet itself as it sends the communication request to the real server. The SOCKS5 server receives the response from the real server and forwards it to the front end as is. Because SOCKS operates on the session layer, it is a scheme that provides security services between the session layer and the session layer, and is not affected by changes in high-level applications.
The SOCKS5 proxy is a universal proxy server that adopts the SOCKS protocol. The default port number is 1080. The SOCKS5 proxy works at the session layer and does not require the application to adhere to a specific operating system platform. The SOCKS5 proxy simply passes packets regardless of the application protocol (such as FTP, HTTP, and NNTP requests).
Introduction to the principles of Socks5
Socks5 is a proxy protocol that sits between the transport layer (TCP/UDP, etc.) and the application layer. The Socks software package consists of the following structures:
Socks library: Installed on the client. As an alternative to the Socket library, all programs that use Socks must change the Socket library function call to a Socks library function call. Note that the Socks library function still needs to call the Socket library function, and the Socks only does security verification on it.
Sockd daemon: Installed on the server, receives and handles CONNECT, BIND and UDP associate requests from clients. Take the CONNECT request as an example. The workflow is as follows:
1. The client sends a request to the proxy server to negotiate the version and authentication method
2. The proxy server replies and sends the selected method to the client
3. The client and proxy server enter a sub-negotiation process determined by the selected authentication method
4. After the sub-negotiation is complete, the client sends a request information containing the IP address and port of the target server
5. The proxy server authenticates the client and connects to the target server
6. The proxy server returns connection information to the client
7. If the connection is complete, the proxy server begins to act as a transfer station for data
The Socks5 protocol supports both TCP and UDP proxies. It mainly works at the session layer, so it has nothing to do with the upper-layer protocols. However, it cannot do global proxy.
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Network security blogger, focusing on practical guides in the field of residential proxy IP; sharing professional insights on network privacy protection and proxy technology in a concise and easy-to-understand way.