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

• 用man wc命令学习wc命令的使用
  

• 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...
    ");
            exit(0);
        }
        while(fscanf(fp,"%s",s)!=EOF)
            count++;
        fclose(fp);
        printf("There is(are) %d word(s) in the text.
    ",count);
        return 0;
    }
    

  • 运行结果：
    

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
  ", file_name);  
    
  	// 打开文件，准备写入  
      	FILE *fp = fopen(file_name, "w");  
      	if(NULL == fp)  
      	{  
          	printf("File:	%s Can Not Open To Write
  ", 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:	%s Write Failed
  ", file_name);  
              	break;  
          	}  
          	bzero(buffer, BUFFER_SIZE);  
      	}  
  	
  	
  	// 接收成功后，关闭文件，关闭socket  
      	printf("Receive File:	%s From Client IP Successful!
  ", 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!
  ");
  		exit(0);
  	}
  	while(fscanf(fp2,"%s",s)!=EOF)
  		words++;
  	fclose(fp2);
  	//printf("%d words.
  ",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:	");
      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
  ", 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!
  ", 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.
  ",atoi(buffer));
  	}  
  
      close(client_socket_fd);  
      return 0;  
  } 
  
  

运行结果

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

• 用man pthread命令学习pthread相关调用
  
  

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
  ", file_name);  
    
  	// 打开文件，准备写入  
  	FILE *fp = fopen(file_name, "w");  
  	if(NULL == fp)  
  	{  
  		printf("File:	%s Can Not Open To Write
  ", 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:	%s Write Failed
  ", file_name);  
              	break;  
          	}  
  		bzero(buffer, BUFFER_SIZE);  
  	}  
  	
  	
  	// 接收成功后，关闭文件，关闭socket  
  	printf("Receive File:	%s From Client IP Successful!
  ", 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!
  ");
  		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

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：

• 解决方法：

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

参考资料

• ubuntu 挂载exfat