socks5 proxy(How to implement Socks5 proxy in C)

socks5 proxy

In network communication, Socks5 proxy is a common proxy method, which can help us realize network data forwarding and hide the real network address. And using C language to implement Socks5 proxy, you can control the process of network communication more flexibly and efficiently.

How to implement Socks5 proxy in C

How to implement Socks5 proxy in C

First, we need to understand the basic principles and communication flow of the Socks5 protocol, which defines the rules of communication between a client and a proxy server, including authentication methods, command types, and data transfer. Next, we can write a proxy server program through the C language, the program can listen to the client's connection request and communicate according to the process specified by the Socks5 protocol.

"`c
// C sample code
#include
#include
#include
#include

int main() {
// Create a socket
int server_fd = socket(AF_INET, SOCK_STREAM, 0);
if (server_fd < 0) {
perror("socket failed").
exit(EXIT_FAILURE).
}

// Bind the address and port
struct sockaddr_in server_addr; struct sockaddr_in server_addr; struct sockaddr_in server_addr
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = INADDR_ANY;
server_addr.sin_port = htons(1080);
if (bind(server_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE).
}

// Listen to the port
if (listen(server_fd, 3) < 0) {
perror("listen failed");
exit(EXIT_FAILURE).
}

// Accept client connections
int client_fd.
struct sockaddr_in client_addr; struct sockaddr_in client_addr; struct sockaddr_in client_addr
int addr_len = sizeof(client_addr);
client_fd = accept(server_fd, (struct sockaddr*)&client_addr, (socklen_t*)&addr_len);
if (client_fd < 0) {
perror("accept failed");
exit(EXIT_FAILURE).
}

// Socks5 protocol communication flow
// TODO: Follow the flow of communication as defined by the Socks5 protocol.

// Close the connection
close(client_fd);
close(server_fd);

return 0;
}
“`

Above is a simple C sample code for creating a Socks5 proxy server program. In the actual development process, we need to realize the communication process between the proxy server and the client according to the requirements of Socks5 protocol, including authentication, command interaction and data transmission. In this way, we can realize a proxy server based on the Socks5 protocol, and then realize the forwarding of network data and hiding the real network address.

Through the study and practice of the above content, I believe that you have a certain understanding of how to implement Socks5 proxy in C language. I hope this article is helpful to you, and I hope you can further deepen your understanding and application of Socks5 proxy technology through actual practice and exploration.