2024.8.12 作业

news2024/9/22 23:28:07

TCP服务器端代码实现

#include <myhead.h>
#define SER_PORT 6666
#define SER_IP "192.168.254.129"
int main(int argc,const char *argv[])
{
    //1.创建套接字文件
    int sfd = socket(AF_INET,SOCK_STREAM,0);
    if(sfd==-1)
    {
        perror("socket error");
        return -1;
    }       
    printf("socket success,sfd = %d\n",sfd);

    //将端口号快速重用
    int reuse = 1;
    if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
    {
        perror("setsockopt error");
        return -1;
    }
    printf("端口号快速重用成功\n");
    
    //2.为套接字绑定ip地址和端口号
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(SER_PORT);
    sin.sin_addr.s_addr = inet_addr(SER_IP);
    if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin))==-1)
    {
        perror("bind error");
        return -1;
    }
    printf("bind success\n");

    //3.将套接字设置为被动监听状态
    if(listen(sfd,128)==-1)
    {
        perror("listen error");
        return -1;
    }
    printf("listen success\n");

    //4.阻塞等待客户端的连接请求
    struct sockaddr_in cin;
    socklen_t addrlen = sizeof(cin);
    int newfd = accept(sfd,(struct sockaddr *)&cin,&addrlen);
    if(newfd==-1)
    {
        perror("accept error");
        return -1;
    }
    printf("[%s:%d]已成功连接一个客户端\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));

    //数据收发
    char buf[128]="";
    while(1)
    {
        memset(buf,0,sizeof(buf));
        int res = recv(newfd,buf,sizeof(buf),0);
        if(res==-1)
        {
            perror("read error");
            return -1;
        }
        else if(res==0)
        {
            printf("客户端已经下线\n");
            close(newfd);
            break;
        }
        printf("[%s:%d] : %s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);
        strcat(buf,"*_*");
        if(send(newfd,buf,strlen(buf),0)==-1)
        {
            perror("发送失败");
            return -1;
        }
        printf("发送成功\n");
    }
    close(sfd);
    return 0;
}

TCP客户端实现

#include <myhead.h>
#define SER_PORT 6666
#define SER_IP "192.168.254.129"
#define CLI_PORT 8888
#define CLI_IP "192.168.254.129"
int main(int argc,const char *argv[])
{
    //1.创建用于通信的套接字文件描述符
    int cfd = socket(AF_INET,SOCK_STREAM,0);
    if(cfd==-1)
    {
        perror("socket error");
        return -1;
    }
    printf("cfd = %d\n",cfd);

    //2.绑定IP地址和端口号
    struct sockaddr_in cin;
    cin.sin_family = AF_INET;
    cin.sin_port = htons(CLI_PORT);
    cin.sin_addr.s_addr = inet_addr(CLI_IP);
    if(bind(cfd,(struct sockaddr *)&cin,sizeof(cin))==-1)
    {
        perror("bind error");
        return -1;
    }
    printf("bind success\n");

    //3.连接到服务器
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(SER_PORT);
    sin.sin_addr.s_addr = inet_addr(SER_IP);
    if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin))==-1)
    {
        perror("connect error");
        return -1;
    }
    printf("连接服务器成功\n");

    //4.数据收发
    char buf[128]="";
    while(1)
    {
        printf("请输入>>>");
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1]=0;
        send(cfd,buf,strlen(buf),0);
        printf("发送成功\n");
        memset(buf,0,sizeof(buf));
        recv(cfd,buf,sizeof(buf),0);
        printf("收到服务器消息为:%s\n",buf);
    }

    //5.关闭套接字
    close(cfd);
    return 0;
}

UDP服务器端实现

#include <myhead.h>
#define SER_PORT 9999
#define SER_IP "192.168.254.129"
int main(int argc,const char *argv[])
{
    //1.创建用于通信的服务器套接字文件描述符
    int sfd = socket(AF_INET,SOCK_DGRAM,0);
    if(sfd==-1)
    {
        perror("socket error");
        return -1;
    }

    //将端口号快速重用
    int reuse = 1;
    if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
    {
        perror("reuse error");
        return -1;
    }
    printf("端口号快速重用成功\n");

    //2.为套接字绑定ip地址和端口号
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(SER_PORT);
    sin.sin_addr.s_addr = inet_addr(SER_IP);
    if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin))==-1)
    {
        perror("bind error");
        return -1;
    } 
    printf("bind success\n");

    //3.数据收发
    char buf[128]="";
    struct sockaddr_in cin;
    socklen_t addrlen = sizeof(cin);
    while(1)
    {
        memset(buf,0,sizeof(buf));
        recvfrom(sfd,buf,sizeof(buf),0,(struct sockaddr *)&cin,&addrlen);
        printf("收到的消息为:%s\n",buf);
        strcat(buf,"*_*");
        if(sendto(sfd,buf,strlen(buf),0,(struct sockaddr *)&cin,sizeof(cin))==-1)
        {
            perror("发送error");
            return -1;
        }
        printf("发送成功\n");
    }
    close(sfd);
    return 0;
}

UDP客户端实现

#include <myhead.h>
#define SER_PORT 9999
#define SER_IP "192.168.254.129"
#define CLI_PORT 5555
#define CLI_IP "192.168.254.129"
int main(int argc,const char *argv[])
{
    //1.创建用于通信的服务器套接字文件描述符
    int cfd = socket(AF_INET,SOCK_DGRAM,0);
    if(cfd==-1)
    {
        perror("socket error");
        return -1;
    }

    //将端口号快速重用
    int reuse = 1;
    if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
    {
        perror("reuse error");
        return -1;
    }
    printf("端口号快速重用成功\n");

    //2.为套接字绑定ip地址和端口号
    struct sockaddr_in cin;
    cin.sin_family = AF_INET;
    cin.sin_port = htons(CLI_PORT);
    cin.sin_addr.s_addr = inet_addr(CLI_IP);
    if(bind(cfd,(struct sockaddr *)&cin,sizeof(cin))==-1)
    {
        perror("bind error");
        return -1;
    } 
    printf("bind success\n");

    //3.数据收发
    char buf[128]="";
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(SER_PORT);
    sin.sin_addr.s_addr = inet_addr(SER_IP);
    while(1)
    {
        printf("请输入>>>");
        fgets(buf,sizeof(buf),stdin);
        buf[strlen(buf)-1]=0;
        if(sendto(cfd,buf,strlen(buf),0,(struct sockaddr *)&sin,sizeof(sin))==-1)
        {
            perror("发送error");
            return -1;
        }
        printf("发送成功\n");
        memset(buf,0,sizeof(buf));
        recvfrom(cfd,buf,sizeof(buf),0,NULL,NULL);
        printf("收到服务器消息为:%s\n",buf);
    }
    close(cfd);
    return 0;
}