VxWorks中实现SOCKS5代理的示例代码

该示例代码展示了如何在VxWorks中实现SOCKS5代理，用于转发网络请求。

/*
 * socks_proxy.c - VxWorks下实现SOCKS5代理的示例代码
 * 首先使用socket API创建代理服务器监听端口，当有请求到达时，解析请求中的目标地址和端口，并建立与目标主机的连接。
 * 使用recv和send API将来自client的请求转发给server，将server的响应转发给client
 */
#include <stdio.h>
#include <sockLib.h>
#include <inetLib.h>
#include <ioLib.h>

void server_task()
{
    int server_fd, client_fd, target_fd;
    struct sockaddr_in server_addr, client_addr, target_addr;
    int server_port = 1080;
    char buffer[4096];
    int len;
    bzero((char *) &server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(server_port);
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    bind(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
    listen(server_fd, 5); 
    while (1) {
        len = sizeof(client_addr);
        client_fd = accept(server_fd, (struct sockaddr *)&client_addr, &len);
        len = recv(client_fd, buffer, sizeof(buffer), 0);
        target_fd = socket(AF_INET, SOCK_STREAM, 0);
        bzero((char *) &target_addr, sizeof(target_addr));
        target_addr.sin_family = AF_INET;
        target_addr.sin_port = htons(buffer[2] * 256 + buffer[3]);
        inet_aton(buffer+4, &target_addr.sin_addr);
        connect(target_fd, (struct sockaddr *)&target_addr, sizeof(target_addr));
        send(target_fd, buffer, len, 0);
        while (len = recv(target_fd, buffer, sizeof(buffer), 0)) {
            send(client_fd, buffer, len, 0);
        }
        close(target_fd);
        close(client_fd);
    }
}

void client_task()
{
    int client_fd, server_fd;
    struct sockaddr_in server_addr;
    int server_port = 1080;
    char buffer[4096];
    int len;
    bzero((char *) &server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(server_port);
    inet_aton("127.0.0.1", &server_addr.sin_addr);
    client_fd = socket(AF_INET, SOCK_STREAM, 0);
    connect(client_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
    buffer[0] = 0x05; // SOCKS5版本号
    buffer[1] = 0x01; // 发送1个认证方式
    buffer[2] = 0x00; // 认证方式为无需认证
    send(client_fd, buffer, 3, 0);
    len = recv(client_fd, buffer, sizeof(buffer), 0);
    buffer[0] = 0x05; // SOCKS5版本号
    buffer[1] = 0x01; // 建立TCP连接
    buffer[2] = 0x00; // 保留位，必须为0
    buffer[3] = 0x03; // 目标服务器地址为域名
    strcpy(buffer + 4, "www.google.com");
    buffer[4 + strlen("www.google.com")] = 0;
    buffer[4 + strlen("www.google.com") + 1] = 0x1F; // 目标服务器端口号为80
    buffer[4 + strlen("www.google.com") + 2] = 0x50;
    send(client_fd, buffer, strlen(buffer + 4) + 7, 0);
    len = recv(client_fd, buffer, sizeof(buffer), 0);
    server_fd = socket(AF_INET, SOCK_STREAM, 0);
    bzero((char *) &server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(buffer[2] * 256 + buffer[3]);
    inet_aton("112.74.214.43", &server_addr.sin_addr);
    connect(server_fd, (struct sockaddr *)&server_addr, sizeof(server_addr));
    send(server_fd, buffer, len, 0);
    while (len = recv(client_fd, buffer, sizeof(buffer), 0)) {
        send(server_fd, buffer, len, 0);
    }
    close(server_fd);
    close(client_fd);
}

int main()
{
    taskSpawn("tServer", 4, 0, 0x1000, (FUNCPTR)server_task, 0,0,0,0,0,0,0,0,0,0);
    taskSpawn("tClient", 4, 0, 0x1000, (FUNCPTR)client_task, 0,0,0,0,0,0,0,0,0,0);
    return 0;
}

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