帮我用C语言写一段客户服务器代码

以下是一个简单的客户端/服务器程序示例，使用 TCP/IP 协议进行通信。

服务器端代码：

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

#define PORT 8080

int main()
{
int server_fd, new_socket, valread;
struct sockaddr_in address;
int opt = 1;
int addrlen = sizeof(address);
char buffer[1024] = {0};
char *hello = "Hello from server";

// 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
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);

// 绑定 socket 到指定端口
if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0)
{
perror("bind failed");
exit(EXIT_FAILURE);
}

// 监听 socket
if (listen(server_fd, 3) < 0)
{
perror("listen");
exit(EXIT_FAILURE);
}

// 接受客户端连接
if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t *)&addrlen)) < 0)
{
perror("accept");
exit(EXIT_FAILURE);
}

// 从客户端读取数据
valread = read(new_socket, buffer, 1024);
printf("%s\n", buffer);

// 向客户端发送数据
send(new_socket, hello, strlen(hello), 0);
printf("Hello message sent\n");

return 0;
}

客户端代码：

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

#define PORT 8080

int main(int argc, char const *argv[])
{
int sock = 0, valread;
struct sockaddr_in serv_addr;
char *hello = "Hello from client";
char buffer[1024] = {0};

// 创建 socket 文件描述符
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
printf("\n Socket creation error \n");
return -1;
}

memset(&serv_addr, '0', sizeof(serv_addr));

serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);

// 将 IPv4 地址从点分十进制转换为二进制格式
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0)
{
printf("\nInvalid address/ Address not supported \n");
return -1;
}

// 连接到服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
printf("\nConnection Failed \n");
return -1;
}

// 向服务器发送数据
send(sock, hello, strlen(hello), 0);
printf("Hello message sent\n");

// 从服务器读取数据
valread = read(sock, buffer, 1024);
printf("%s\n", buffer);

return 0;
}