2017-2018-1 20155314《信息安全系统设计基础》实验三 并发程序

2017-2018-1 20155314《信息安全系统设计基础》实验三 并发程序

并发程序-1

实验要求

  • 学习使用Linux命令wc(1)
  • 基于Linux Socket程序设计实现wc(1)服务器(端口号是你学号的后6位)和客户端
  • 客户端传一个文本文件给服务器
  • 服务器返加文本文件中的单词数

上方提交代码

附件提交测试截图,至少要测试附件中的两个文件

实验步骤

  • man wc命令学习wc命令的使用
    29cjO.png

  • mywc的编写

    • mywc20155314.c:

      #include <stdio.h>
      #include <stdlib.h>
      int main(int argc, char *argv[]){
          int count=0;
          char s[100];
          FILE *fp;
          if((fp=fopen(argv[1],"r"))==NULL){
              printf("Open the file failure...\n");
              exit(0);
          }
          while(fscanf(fp,"%s",s)!=EOF)
              count++;
          fclose(fp);
          printf("There is(are) %d word(s) in the text.\n",count);
          return 0;
      }
      
    • 运行结果:
      2peeJ.png

本题代码

  • server.c:

    #include<netinet/in.h>  // sockaddr_in  
    #include<sys/types.h>   // socket  
    #include<sys/socket.h>  // socket  
    #include<stdio.h>       // printf  
    #include<stdlib.h>      // exit  
    #include<string.h>      // bzero  
      
    #define SERVER_PORT 155314  
    #define LENGTH_OF_LISTEN_QUEUE 20  
    #define BUFFER_SIZE 1024
    #define FILE_NAME_MAX_SIZE 512  
     
    int main(void)  
    {  
        // 声明并初始化一个服务器端的socket地址结构  
        struct sockaddr_in server_addr;  
        bzero(&server_addr, sizeof(server_addr));  
        server_addr.sin_family = AF_INET;  
        server_addr.sin_addr.s_addr = htons(INADDR_ANY);  
        server_addr.sin_port = htons(SERVER_PORT);  
      
        // 创建socket,若成功,返回socket描述符  
        int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);  
        if(server_socket_fd < 0)  
        {  
            perror("Create Socket Failed:");  
            exit(1);  
        }  
        int opt = 1;  
        setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));  
      
        // 绑定socket和socket地址结构  
        if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))  
        {  
            perror("Server Bind Failed:");  
            exit(1);  
        }  
          
        // socket监听  
        if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))  
        {  
            perror("Server Listen Failed:");  
            exit(1);  
        }  
      
        while(1)  
        {  
            // 定义客户端的socket地址结构  
            struct sockaddr_in client_addr;  
            socklen_t client_addr_length = sizeof(client_addr);  
      
            // 接受连接请求,返回一个新的socket(描述符),这个新socket用于同连接的客户端通信  
            // accept函数会把连接到的客户端信息写到client_addr中  
            int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);  
            if(new_server_socket_fd < 0)  
            {  
                perror("Server Accept Failed:");  
                break;  
            }  
      
           // recv函数接收数据到缓冲区buffer中  
            char buffer[BUFFER_SIZE];  
            bzero(buffer, BUFFER_SIZE);  
            if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
            {  
                perror("Server Recieve Data Failed:");  
                break;  
            }  
      
            // 然后从buffer(缓冲区)拷贝到file_name中  
            char file_name[FILE_NAME_MAX_SIZE+1];  
            bzero(file_name, FILE_NAME_MAX_SIZE+1);  
            strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));  
            printf("%s\n", file_name);  
      
    	// 打开文件,准备写入  
        	FILE *fp = fopen(file_name, "w");  
        	if(NULL == fp)  
        	{  
            	printf("File:\t%s Can Not Open To Write\n", file_name);  
            	exit(1);  
        	}  
      	
    	// 从客户端接收数据到buffer中  
        	// 每接收一段数据,便将其写入文件中,循环直到文件接收完并写完为止  
        	bzero(buffer, BUFFER_SIZE);  
        	int length = 0;  
        	while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)  
        	{  
    		if(strcmp(buffer,"OK")==0) break;
            	if(fwrite(buffer, sizeof(char), length, fp) < length)  
            	{  
                	printf("File:\t%s Write Failed\n", file_name);  
                	break;  
            	}  
            	bzero(buffer, BUFFER_SIZE);  
        	}  
    	
    	
    	// 接收成功后,关闭文件,关闭socket  
        	printf("Receive File:\t%s From Client IP Successful!\n", file_name);  
        	fclose(fp);
    
    
    	// 统计文件单词个数,并发送给客户端
    	int words=0;
    	char s[100];
    	FILE *fp2;
    	if((fp2=fopen(file_name,"r"))==NULL){
    		printf("ERROR!\n");
    		exit(0);
    	}
    	while(fscanf(fp2,"%s",s)!=EOF)
    		words++;
    	fclose(fp2);
    	//printf("%d words.\n",words);
    
    
    	sprintf(buffer,"%d",words);
    
    	send(new_server_socket_fd,buffer,BUFFER_SIZE,0);
    
    	//send(new_server_socket_fd,&words,sizeof(words),0);
    	close(new_server_socket_fd);  
    	
    	
    	
            // 关闭与客户端的连接  
            
        }  
        // 关闭监听用的socket  
        close(server_socket_fd);  
        return 0;  
    } 
    
    
  • client.c:

    #include<netinet/in.h>   // sockaddr_in  
    #include<sys/types.h>    // socket  
    #include<sys/socket.h>   // socket  
    #include<stdio.h>        // printf  
    #include<stdlib.h>       // exit  
    #include<string.h>       // bzero  
      
    #define SERVER_PORT 155314  
    #define BUFFER_SIZE 1024  
    #define FILE_NAME_MAX_SIZE 512  
      
    int main()  
    {  
        // 声明并初始化一个客户端的socket地址结构  
        struct sockaddr_in client_addr;  
        bzero(&client_addr, sizeof(client_addr));  
        client_addr.sin_family = AF_INET;  
        client_addr.sin_addr.s_addr = htons(INADDR_ANY);  
        client_addr.sin_port = htons(0);  
      
        // 创建socket,若成功,返回socket描述符  
        int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);  
        if(client_socket_fd < 0)  
        {  
            perror("Create Socket Failed:");  
            exit(1);  
        }  
      
        // 绑定客户端的socket和客户端的socket地址结构 非必需  
        if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))  
        {  
            perror("Client Bind Failed:");  
            exit(1);  
        }  
      
        // 声明一个服务器端的socket地址结构,并用服务器那边的IP地址及端口对其进行初始化,用于后面的连接  
        struct sockaddr_in server_addr;  
        bzero(&server_addr, sizeof(server_addr));  
        server_addr.sin_family = AF_INET;  
        if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)  
        {  
            perror("Server IP Address Error:");  
            exit(1);  
        }  
        server_addr.sin_port = htons(SERVER_PORT);  
        socklen_t server_addr_length = sizeof(server_addr);  
      
        // 向服务器发起连接,连接成功后client_socket_fd代表了客户端和服务器的一个socket连接  
        if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)  
        {  
            perror("Can Not Connect To Server IP:");  
            exit(0);  
        }  
      
        // 输入文件名,并放到缓冲区buffer中等待发送  
        char file_name[FILE_NAME_MAX_SIZE+1];  
        bzero(file_name, FILE_NAME_MAX_SIZE+1);  
    
        printf("Please Input File Name On Client:\t");
        scanf("%s", file_name);  
      
        char buffer[BUFFER_SIZE];  
        bzero(buffer, BUFFER_SIZE);  
        strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));  
          
        // 向服务器发送buffer中的数据  
        if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
        {  
            perror("Send File Name Failed:");  
            exit(1);  
        }  
      
        
        // 打开文件并读取文件数据  
            FILE *fp = fopen(file_name, "r");  
            if(NULL == fp)  
            {  
                printf("File:%s Not Found\n", file_name);  
            }  
            else  
            {  
                bzero(buffer, BUFFER_SIZE);  
                int length = 0;  
                // 每读取一段数据,便将其发送给服务器,循环直到文件读完为止  
                while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)  
                {  
                    if(send(client_socket_fd, buffer, length, 0) < 0)  
                    {  
                        printf("Send File:%s Failed./n", file_name);  
                        break;  
                    }  
                    bzero(buffer, BUFFER_SIZE);  
                }  
      
                // 关闭文件  
    	    
                fclose(fp);  
                printf("File:%s Transfer Successful!\n", file_name);  
    	    char s[50];	
    	    scanf("%s",s);
    	    send(client_socket_fd,"OK",BUFFER_SIZE,0);
    	    recv(client_socket_fd,buffer,BUFFER_SIZE,0);	
    	    printf("%d words.\n",atoi(buffer));
    	}  
    
        close(client_socket_fd);  
        return 0;  
    } 
    
    

运行结果

2p5lT.png

并发程序-2

实验要求

  • 使用多线程实现wc服务器并使用同步互斥机制保证计数正确
  • 上方提交代码
  • 下方提交测试
  • 对比单线程版本的性能,并分析原因

实验步骤

  • man pthread命令学习pthread相关调用
    294UA.png
    29hEd.png

本题代码

  • pthread_server.c:

    #include<netinet/in.h>  // sockaddr_in  
    #include<sys/types.h>   // socket  
    #include<sys/socket.h>  // socket  
    #include<stdio.h>       // printf  
    #include<stdlib.h>      // exit  
    #include<string.h>      // bzero  
      
    #define SERVER_PORT 155314  
    #define LENGTH_OF_LISTEN_QUEUE 20  
    #define BUFFER_SIZE 1024
    #define FILE_NAME_MAX_SIZE 512  
    
    pthread_mutex_t counter_mutex = PTHREAD_MUTEX_INITIALIZER;
    
    void *mywc20155314(void *m) // 统计文件单词个数
    {
    	pthread_mutex_lock(&counter_mutex);
    	// recv函数接收数据到缓冲区buffer中  
    	char buffer[BUFFER_SIZE]; 
    	bzero(buffer, BUFFER_SIZE);
    	if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)  
    	{  
    		perror("Server Recieve Data Failed:");  
    		break;  
    	}  
    
    	// 然后从buffer(缓冲区)拷贝到file_name中  
    	char file_name[FILE_NAME_MAX_SIZE+1];  
    	bzero(file_name, FILE_NAME_MAX_SIZE+1);  
    	strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));  
    	printf("%s\n", file_name);  
      
    	// 打开文件,准备写入  
    	FILE *fp = fopen(file_name, "w");  
    	if(NULL == fp)  
    	{  
    		printf("File:\t%s Can Not Open To Write\n", file_name);  
    		exit(1);  
    	}  
      	
    	// 从客户端接收数据到buffer中  
    	// 每接收一段数据,便将其写入文件中,循环直到文件接收完并写完为止  
    	bzero(buffer, BUFFER_SIZE);  
    	int length = 0;  
    	while((length = recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)  
    	{  
    		if(strcmp(buffer,"OK")==0) break;
            	if(fwrite(buffer, sizeof(char), length, fp) < length)  
            	{  
                	printf("File:\t%s Write Failed\n", file_name);  
                	break;  
            	}  
    		bzero(buffer, BUFFER_SIZE);  
    	}  
    	
    	
    	// 接收成功后,关闭文件,关闭socket  
    	printf("Receive File:\t%s From Client IP Successful!\n", file_name);  
    	fclose(fp);
    
    
    	// 统计文件单词个数,并发送给客户端
    	int words=0;
    	char s[100];
    	FILE *fp2;
    	if((fp2=fopen(file_name,"r"))==NULL){
    		printf("ERROR!\n");
    		exit(0);
    	}
    	while(fscanf(fp2,"%s",s)!=EOF)
    		words++;
    	fclose(fp2);
    
    	sprintf(buffer,"%d",words);
    
    	send(new_server_socket_fd,buffer,BUFFER_SIZE,0);
    	close(new_server_socket_fd);  
    	
    	// 关闭与客户端的连接
    	
    	pthread_mutex_unlock( &counter_mutex );
    	return NULL;   
    
    }
    
    int main(void)  
    {  
        // 声明并初始化一个服务器端的socket地址结构  
        struct sockaddr_in server_addr;  
        bzero(&server_addr, sizeof(server_addr));  
        server_addr.sin_family = AF_INET;  
        server_addr.sin_addr.s_addr = htons(INADDR_ANY);  
        server_addr.sin_port = htons(SERVER_PORT);  
      
        // 创建socket,若成功,返回socket描述符  
        int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);  
        if(server_socket_fd < 0)  
        {  
            perror("Create Socket Failed:");  
            exit(1);  
        }  
        int opt = 1;  
        setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));  
      
        // 绑定socket和socket地址结构  
        if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))  
        {  
            perror("Server Bind Failed:");  
            exit(1);  
        }  
          
        // socket监听  
        if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))  
        {  
            perror("Server Listen Failed:");  
            exit(1);  
        }  
      
        while(1)  
        {  
            // 定义客户端的socket地址结构  
            struct sockaddr_in client_addr;  
            socklen_t client_addr_length = sizeof(client_addr);  
      
            // 接受连接请求,返回一个新的socket(描述符),这个新socket用于同连接的客户端通信  
            // accept函数会把连接到的客户端信息写到client_addr中  
            int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);  
            if(new_server_socket_fd < 0)  
            {  
                perror("Server Accept Failed:");  
                break;  
            }
        	
    		pthread_create(&t, NULL, &wc, NULL);
    		pthread_join(&t, NULL);
            
        }  
        // 关闭监听用的socket  
        close(server_socket_fd);  
        return 0;  
    } 
    
    
  • pthread_client.c同并发程序-1的client.c

运行结果

2pAQU.png

实验中遇到的问题及解决过程

Ubuntu Linux下exfat挂载问题

  • 问题描述:

    在Ubuntu下,由于版权的原因,默认不支持exFAT格式的U盘:29aB4.png

  • 解决方法:

    sudo apt-get install exfat-utils命令添加对exFAT的支持:
    29dHJ.png
    我的64G exFAT格式的U盘终于能被Ubuntu所读取!
    290E9.png

参考资料

posted @ 2017-11-19 22:44  20155314刘子健  阅读(300)  评论(0编辑  收藏  举报
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