Artical--2--TCP_IP服务器端/客户端迭代一

阳光穿透心脏的1/2处 2022-08-30 04:13 175阅读 0赞

## Artical–2--TCP\_IP服务器端/客户端迭代一 ##

迭代一：服务器端简单将接收到客户端的message，发回给客户端：  
echo\_server.c

#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <arpa/inet.h>
    #include <sys/socket.h>
    
    #define BUF_SIZE 1024
    void error_handling(char * message);
    
    int main(int argc,char * argv[])
    {
        
        int serv_sock;
        int clnt_sock;
        
        char message[BUF_SIZE];
        int str_len,i;
    
        struct sockaddr_in serv_adr;
        struct sockaddr_in clnt_adr;
        socklen_t clnt_adr_sz;
    
        if(argc != 2)
        {
        
            printf("usage : %s <port>\n",argv[0]);
            exit(1);
        }
        
        serv_sock = socket(PF_INET,SOCK_STREAM,0);
        if(serv_sock == -1)
            error_handling("socket() error");
        
        memset(&serv_adr,0,sizeof(serv_adr));
        serv_adr.sin_family = AF_INET;
        serv_adr.sin_addr.s_addr=htonl(INADDR_ANY);
        serv_adr.sin_port=htons(atoi(argv[1]));
    
        if(bind(serv_sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
            error_handling("bind() error");
        if(listen(serv_sock,5)==-1)
            error_handling("listen() error");
        clnt_adr_sz=sizeof(clnt_adr);
        for(i=0;i<5;i++){
        
        clnt_sock=accept(serv_sock,(struct sockaddr*)&clnt_adr,&clnt_adr_sz);
        if(clnt_sock==-1)
            error_handling("accept() error");
        else
            printf("Connected client %d \n",i+1);
    
        //read(clnt_sock,server_recv_msg,sizeof(server_recv_msg));
        //printf("server recieve client %s\n",server_recv_msg);
        while((str_len=read(clnt_sock,message,BUF_SIZE))!=0)     
             write(clnt_sock,message,sizeof(message));
        close(clnt_sock);
        }
        close(serv_sock);
        return 0;
    }
    
    void error_handling(char *message)
    {
        
        fputs(message,stderr);
        fputc('\n',stderr);
        exit(1);
     }

echo\_client.c

#include <stdio.h>
    #include <stdlib.h>
    #include <string.h>
    #include <unistd.h>
    #include <arpa/inet.h>
    #include <sys/socket.h>
    
    #define BUF_SIZE 1024
    void error_handling(char * message);
    
    int main(int argc, char * argv[])
    {
        
        int sock;
        char message[BUF_SIZE];
        int str_len;
        struct sockaddr_in serv_adr;
    
        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() error");
    
        memset(&serv_adr,0,sizeof(serv_adr));
        serv_adr.sin_family=AF_INET;
        serv_adr.sin_addr.s_addr=inet_addr(argv[1]);
        serv_adr.sin_port=htons(atoi(argv[2]));
    
        if(connect(sock,(struct sockaddr*)&serv_adr,sizeof(serv_adr))==-1)
    	    error_handling("connect() error !");
        else
    	    puts("connected.........");
    
        while(1){
        
            fputs("Input message(Q to quit): ",stdout);
    	fgets(message,BUF_SIZE,stdin);
    
    	if(!strcmp(message,"q\n") || !strcmp(message,"Q\n"))
    		break;
    
    	write(sock,message,strlen(message));
    	str_len=read(sock,message,BUF_SIZE-1);
    	message[str_len]=0;
    	printf("Message from server : %s",message);
        }
        close(sock);
        return 0;
    }
    
    void error_handling(char * message){
        
    	fputs(message,stderr);
    	fputc('\n',stderr);
    	exit(1);
    }

运行示意图：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L015TnVUaA_size_16_color_FFFFFF_t_70_pic_center]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L015TnVUaA_size_16_color_FFFFFF_t_70_pic_center]: /images/20220829/bf3ce1d8ac1a41759e21486ba2ec7217.png