网络编程模型——基础模板

Posted 2023-02-03 _BitterSweet

server.c 服务器端

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

void error_handling(char *message)

    fputs(message, stderr);
    fputc('\\n', stderr);
    exit(1);



int main(int argc, char *argv[])

    int server_sock;
    int client_sock;

    struct sockaddr_in server_addr;
    struct sockaddr_in client_addr;
    socklen_t client_addr_size;

    char message[] = "hello world!";

    if(argc != 2)
    
        printf("Usage : %s <port>\\n", argv[0]);
    

    // 创建套接字
    server_sock = socket(PF_INET, SOCK_STREAM, 0); 
    if(server_sock == -1)
    
        error_handling("socket create error");
    

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    server_addr.sin_port = htons(atoi(argv[1]));

    //调用bind函数分配ip地址和端口号
    if(bind(server_sock, (struct sockaddr*) &server_addr, sizeof(server_addr)) == -1)
    
        error_handling("bind error");
    

    //listen：将套接字转为可接受连接状态
    if(listen(server_sock, 5) == -1)
    
        error_handling("listen error");
    

    client_addr_size = sizeof(client_addr);
    //accept函数：处理连接请求，没有连接的情况下调用该函数，则不会返回
    client_sock = accept(server_sock, (struct sockaddr*) &client_addr, &client_addr_size);
    if(client_sock == -1)
    
        error_handling("accept error");
    
    //write：用于传输数据
    write(client_sock, message, sizeof(message));
    close(client_sock);
    close(server_sock);

    return 0;

client.c 客户端

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

void error_handling(char *message)

    fputs(message, stderr);
    fputc('\\n', stderr);
    exit(1);



int main(int argc, char *argv[])

    int sock;
    struct sockaddr_in server_addr;
    char message[128];
    int str_len;

    if(argc != 3)
    
        printf("Usage : %s <ip> <port>\\n", argv[0]);
        exit(1);
    

    sock = socket(PF_INET, SOCK_STREAM, 0);
    if(sock == -1)
    
        error_handling("socket create error");
    

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr(argv[1]);
    server_addr.sin_port = htons(atoi(argv[2]));

    if(connect(sock, (struct sockaddr*)&server_addr, sizeof(server_addr)) == -1)
    
        error_handling("connect error");
    

    str_len = read(sock, message, sizeof(message) - 1);
    if(str_len == -1)
    
        error_handling("read error");
    

    printf("Message from server : %s \\n", message);
    close(sock);
    return 0;

执行方式：

• gcc server.c -o server / gcc client.c -o client
• ./server 8080
• ./client 127.0.0.1 8080
• message可以自定义发送消息内容