linux下c语言心跳包

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 8080
#define BUFFER_SIZE 1024

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[BUFFER_SIZE] = {0};

    // 创建socket文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // 绑定端口
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

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

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

    while (1) {
        int valread = read(new_socket, buffer, BUFFER_SIZE);
        if (strcmp(buffer, "HEARTBEAT") == 0) {
            printf("Heartbeat received
");
            send(new_socket, "HEARTBEAT_ACK", 12, 0);
        }
        memset(buffer, 0, BUFFER_SIZE);
    }

    return 0;
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 8080
#define BUFFER_SIZE 1024

int main() {
    int sock = 0;
    struct sockaddr_in serv_addr;
    char *hello = "HEARTBEAT";
    char buffer[BUFFER_SIZE] = {0};

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

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

    // 转换IPv4地址从文本到二进制形式
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0)  {
        printf("
Invalid address/ Address not supported 
");
        return -1;
    }

    // 连接服务器
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("
Connection Failed 
");
        return -1;
    }

    while (1) {
        send(sock, hello, strlen(hello), 0);
        printf("Heartbeat sent
");
        int valread = read(sock, buffer, BUFFER_SIZE);
        if (strcmp(buffer, "HEARTBEAT_ACK") == 0) {
            printf("Heartbeat acknowledged
");
        }
        sleep(5); // 每5秒发送一次心跳包
    }

    return 0;
}