C 实现sock5 代理程序
时间: 2024-02-17 15:05:02 浏览: 27
下面是一个简单的 C 语言实现 SOCKS5 代理程序的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#define PORT 8888
int main(int argc, char const *argv[]) {
int proxy_sock, client_sock, server_sock, valread;
struct sockaddr_in proxy_addr, client_addr, server_addr;
char buffer[1024] = {0};
// 创建代理服务器 socket
if ((proxy_sock = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置代理服务器地址
proxy_addr.sin_family = AF_INET;
proxy_addr.sin_addr.s_addr = INADDR_ANY;
proxy_addr.sin_port = htons(PORT);
// 绑定代理服务器 socket
if (bind(proxy_sock, (struct sockaddr *)&proxy_addr, sizeof(proxy_addr)) < 0) {
perror("bind failed");
exit(EXIT_FAILURE);
}
// 开始监听
if (listen(proxy_sock, 3) < 0) {
perror("listen failed");
exit(EXIT_FAILURE);
}
while (1) {
printf("Waiting for incoming connection...\n");
int addr_len = sizeof(client_addr);
// 接受客户端连接
if ((client_sock = accept(proxy_sock, (struct sockaddr *)&client_addr, (socklen_t *)&addr_len)) < 0) {
perror("accept failed");
exit(EXIT_FAILURE);
}
printf("Client connected from %s:%d\n", inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
// 读取客户端请求
valread = read(client_sock, buffer, 1024);
printf("%s\n", buffer);
// 连接目标服务器
if ((server_sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
perror("socket failed");
exit(EXIT_FAILURE);
}
// 设置目标服务器地址
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(80);
if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) <= 0) {
perror("inet_pton failed");
exit(EXIT_FAILURE);
}
// 连接目标服务器
if (connect(server_sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
perror("connect failed");
exit(EXIT_FAILURE);
}
// 将客户端请求转发给目标服务器
send(server_sock, buffer, strlen(buffer), 0);
printf("Request forwarded to server\n");
// 读取目标服务器响应
valread = read(server_sock, buffer, 1024);
printf("Response received from server\n");
// 将目标服务器响应转发给客户端
send(client_sock, buffer, strlen(buffer), 0);
printf("Response forwarded to client\n");
close(client_sock);
close(server_sock);
}
return 0;
}
```
这段代码创建了一个 SOCKS5 代理服务器,监听指定端口号。当客户端连接到该端口时,代理服务器会读取客户端请求并连接到目标服务器,将客户端请求转发给目标服务器,并读取目标服务器响应并将其转发给客户端。注意,该示例代码中的目标服务器地址和端口号是硬编码的,需要根据实际情况进行修改。
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