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Webserver(4.3)TCP通信实现

article 2024/12/25 2:14:50

服务器端

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

int main(){
    //1.创建socket(用于监听的套接字)
    int lfd=socket(AF_INET,SOCK_STREAM,0);
    if(lfd==-1){
        perror("socket");
        exit(0);
    }
    //2.绑定
    struct sockaddr_in saddr;
    saddr.sin_family=AF_INET;
    //indet_pton(AF_INET,"192.168.227.129",saddr.sin_addr.s_addr);
    saddr.sin_addr.s_addr=INADDR_ANY;
    saddr.sin_port=htons(9999);
    int ret=bind(lfd,(struct sockaddr *)&saddr,sizeof(saddr));
    if(ret==-1){
        perror("bind");
        exit(0);
    }

    //3.监听
    ret=listen(lfd,8);
    if(ret==-1){
        perror("listen");
        exit(0);
    }

    //4.接收客户端的连接
    struct sockaddr_in clientaddr;
    socklen_t len=sizeof(clientaddr);
    int cfd=accept(lfd,(struct sockaddr *)&clientaddr,&len);
    if(cfd==-1){
        perror("accept");
        exit(0);
    }

    //输出客户端的信息
    char clientIP[16];
    inet_ntop(AF_INET,&clientaddr.sin_addr.s_addr,clientIP,sizeof(clientIP));
    unsigned short clientPort =ntohs(clientaddr.sin_port);
    printf("client ip is %s,port is %d\n",clientIP,clientPort);

    //5.通信
    char recvBuf[1024]={0};
    //获取客户端的数据
    while(1){
        
        int num=read(cfd,recvBuf,sizeof(recvBuf));
        if(num==-1){
            perror("read");
            exit(-1);
        }else if(num>0){
            printf("recv client data:%s\n",recvBuf);
        }else if(num==0){
            //表示客户端断开连接
            printf("client closed...");
            break;
        }

        char * data="hello,i am server";
        //给客户端发送数据
        write(cfd,data,strlen(data));
    }
    

    //关闭文件描述符
    close(cfd);
    close(lfd);

    return 0;
}

客户端

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

int main(){

    //1.创建套接字
    int fd=socket(AF_INET,SOCK_STREAM,0);
    if(fd==-1){
        perror("socket");
        exit(-1);
    }

    //2.连接服务器端
    struct sockaddr_in serveraddr;
    serveraddr.sin_family=AF_INET;
    inet_pton(AF_INET,"192.168.227.129",&serveraddr.sin_addr.s_addr);
    serveraddr.sin_port=htons(9999);
    int ret=connect(fd,(struct sockaddr *)&serveraddr,sizeof(serveraddr));
    if(ret==-1){
        perror("connect");
        exit(-1);
    }

    char recvBuf[1024]={0};
    //3.通信
    while(1){
         char * data="hello,i am client";
        //给服务器发送数据
        write(fd,data,strlen(data));
        sleep(1);
        
        int len=read(fd,recvBuf,sizeof(recvBuf));
        if(len==-1){
            perror("read");
            exit(-1);
        }else if(len>0){
            printf("recv server data:%s\n",recvBuf);
        }else if(len==0){
            //表示客户端断开连接
            printf("server closed...");
        }
    }
   

    //关闭连接
    close(fd);



    return 0;
}