实验四 Web服务器1-socket编程

基于华为鲲鹏云服务器CentOS中（或Ubuntu），使用Linux Socket实现：
1. time服务器的客户端服务器，提交程序运行截图
2. echo服务器的客户端服务器，提交程序运行截图，服务器把客户端传进来的内容加入“服务器进程pid  你的学号 姓名 echo :”返回给客户端
3. 服务器部署到华为云服务器，客户端用Ubuntu虚拟机。
4. 要用多线程或者多进程实现,至少连接两个客户端。
5. 把服务器部署到试验箱。（加分项）

time服务器与客户端

time_server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <time.h>

#define PORT 12345

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    
    // Create socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // Forcefully attaching socket to the port 12345
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    // Forcefully attaching socket to the port 12345
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))<0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    while (1) {
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0) {
            perror("accept");
            exit(EXIT_FAILURE);
        }
        char buffer[1024] = {0};
        time_t current_time;
        time(&current_time);
        snprintf(buffer, sizeof(buffer), "%s", ctime(&current_time));
        send(new_socket, buffer, strlen(buffer), 0);
        printf("Time sent to the client\n");
        close(new_socket);
    }
    return 0;
}

time_client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>

#define PORT 12345

int main() {
    struct sockaddr_in serv_addr;
    int sock = 0, valread;
    char buffer[1024] = {0};
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\n Socket creation error \n");
        return -1;
    }
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    // Convert IPv4 and IPv6 addresses from text to binary form
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("\nConnection Failed \n");
        return -1;
    }
    valread = read(sock, buffer, 1024);
    printf("%s\n", buffer);
    return 0;
}

运行截图：

echo服务器与客户端

echo_server.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/types.h>

#define PORT 12345

void handle_client(int new_socket) {
    char buffer[1024] = {0};
    int valread = read(new_socket, buffer, 1024);
    printf("Received message from client: %s\n", buffer);
    
    // 构造回复消息
    pid_t pid = getpid();
    char student_id[] = "20211110";
    char student_name[] = "梁艺轩";
    char reply_message[1024];
    sprintf(reply_message, "服务器进程pid %d %s %s echo: %s", pid, student_id, student_name, buffer);
    
    // 发送回复消息给客户端
    send(new_socket, reply_message, strlen(reply_message), 0);
    printf("Reply sent to the client\n");
    close(new_socket);
}

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    
    // 创建socket文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    
    // 设置socket选项，允许地址重用
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    
    // 将socket绑定到指定的IP地址和端口号
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))<0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
  
    while (1) {
        if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0) {
            perror("accept");
            exit(EXIT_FAILURE);
        }
        handle_client(new_socket);
    }
    return 0;
}

echo_client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

#define PORT 12345

int main() {
    struct sockaddr_in serv_addr;
    int sock = 0, valread;
    char buffer[1024] = {0};
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("\n Socket creation error \n");
        return -1;
    }
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    // 将IPv4地址从文本转换为二进制形式
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0) {
        printf("\nInvalid address/ Address not supported \n");
        return -1;
    }
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("\nConnection Failed \n");
        return -1;
    }
    
    // 发送消息给服务器
    char message[] = "Hello, server!";
    send(sock, message, strlen(message), 0);
    
    // 从服务器接收回复
    valread = read(sock, buffer, 1024);
    printf("Reply from server: %s\n", buffer);
    
    return 0;
}

运行截图：