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
    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...
");
        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：
      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
", 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

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

  • 用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
", 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

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：

    用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

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原文地址：https://www.cnblogs.com/crazymosquito/p/7862622.html