网络基础—socket编程（2）-----基于UDP的客户端和服务器端的实现

亦凉 2022-05-28 03:49 224阅读 0赞

## 基于UDP的socket 服务端和客户端实现 ##

**——服务端**

#include <stdlib.h>
    #include <stdio.h>
    #include <errno.h>
    #include <string.h>
    #include <unistd.h>
    #include <netdb.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    
    #define SERVER_PORT 7890 
    #define MAX_MSG_SIZE 1024 
    
    
    int main(void) 
    { 
        int sockfd; 
        struct sockaddr_in addr; 
    
        sockfd=socket(AF_INET,SOCK_DGRAM,0); 
    
        bzero(&addr,sizeof(struct sockaddr_in)); // 初始化,置0
        addr.sin_family=AF_INET; // Internet
        addr.sin_addr.s_addr=htonl(INADDR_ANY); 
        //addr.sin_addr.s_addr=inet_addr("127.0.0.1"); 
        addr.sin_port=htons(SERVER_PORT); 
    
        int ret = bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in)); 
    
    
        struct sockaddr_in client_addr; 
        int addrlen,n; 
        char msg[MAX_MSG_SIZE]; 
    
        while(1) 
        {   
            bzero(msg,sizeof(msg)); // 初始化,清零
            addrlen = sizeof(struct sockaddr); 
            n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0,(struct sockaddr*)&client_addr,&addrlen); // 从客户端接收消息
            msg[n]=0; 
            fprintf(stdout,"Server received %s",msg); // 显示消息
        } 
    
        close(sockfd); 
    }

**——客户端**

#include <stdlib.h>
    #include <stdio.h>
    #include <errno.h>
    #include <string.h>
    #include <unistd.h>
    #include <netdb.h>
    #include <sys/socket.h>
    #include <netinet/in.h>
    #include <sys/types.h>
    #include <arpa/inet.h>
    
    #define SERVER_PORT 7890 
    #define MAX_BUF_SIZE 1024 
    
    
    int main(int argc,char **argv) 
    { 
        int sockfd; 
        struct sockaddr_in addr; 
    
        sockfd=socket(AF_INET,SOCK_DGRAM,0); 
    
        bzero(&addr,sizeof(struct sockaddr_in)); // 初始化,置0
        addr.sin_family=AF_INET; // Internet
        addr.sin_port=htons(SERVER_PORT);
        int ret = inet_aton(argv[1],&addr.sin_addr); 
    
    
        char buffer[MAX_BUF_SIZE]; 
        int n; 
        while(1) 
        {   
            fgets(buffer,MAX_BUF_SIZE,stdin); 
            struct sockadd_int *t_addr = &addr;
            sendto(sockfd,buffer,strlen(buffer),0,(struct sockaddr*)t_addr,sizeof(struct sockaddr_in)); 
            bzero(buffer,MAX_BUF_SIZE); 
        } 
    
        close(sockfd); 
    }