2017-2018-1 20155219 《信息安全系统设计基础》实验三——实时系统
- 任务一
1.学习使用Linux命令wc(1)
2.基于Linux Socket程序设计实现wc服务器(端口号是你学号的后6位)和客户端
3.客户端传一个文本文件给服务器
4.服务器返加文本文件中的单词数
实验步骤
命令wc(1)
1．命令格式：
wc [选项]文件...
2．命令功能：
统计指定文件中的字节数、字数、行数，并将统计结果显示输出。该命令统计指定文件中的字节数、字数、行数。如果没有给出文件名，则从标准输入读取。wc同时也给出所指定文件的总统计数。
3．命令参数：
-c 统计字节数。
-l 统计行数。
-m 统计字符数。这个标志不能与 -c 标志一起使用。
-w 统计字数。一个字被定义为由空白、跳格或换行字符分隔的字符串。
-L 打印最长行的长度。
-help 显示帮助信息
学到的知识点
-
更加清楚了客户端与服务器之间的编程关系
-
学习了基于c语言的多线程socket编程。
-
学习了线程之间的分工合作
-
了解了线程间的互斥机制保
-
任务1客户端
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <time.h>
#define HELLO_WORLD_SERVER_PORT 6666
#define BUFFER_SIZE 1024
char* itoa(int num,char* str,int radix);
void talk_to_server(char ** argv)
{
//设置一个socket地址结构client_addr,代表客户机internet地址, 端口
struct sockaddr_in client_addr;
bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0
client_addr.sin_family = AF_INET; //internet协议族
client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址
client_addr.sin_port = htons(0); //0表示让系统自动分配一个空闲端口
//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
int client_socket = socket(AF_INET,SOCK_STREAM,0);
time_t t;
if( client_socket < 0)
{
printf("Create Socket Failed!\n");
exit(1);
}
//把客户机的socket和客户机的socket地址结构联系起来
if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
{
printf("Client Bind Port Failed!\n");
exit(1);
}
//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
{
printf("Server IP Address Error!\n");
exit(1);
}
server_addr.sin_port = htons(HELLO_WORLD_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代表了客户机和服务器的一个socket连接
if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
{
printf("Can Not Connect To %s!\n",argv[1]);
exit(1);
}
char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
//从服务器接收数据到buffer中
int i=0;
int length = recv(client_socket,buffer,BUFFER_SIZE,0);
if(length < 0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1]);
exit(1);
}
printf("From Server %s :\t",argv[1]);
/*
while(buffer[i]!='\n')
{
printf("%c",buffer[i]);
i++;
}
printf("\n");
i++;
int b=buffer[i]-48+buffer[++i]-48;
printf("%d\n",b);*/
length = recv(client_socket,(void *)&t,sizeof(time_t),0);
if(length < 0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1]);
exit(1);
}
printf("当前时间： %s \n",ctime(&t));
bzero(buffer,BUFFER_SIZE);
//从服务器接收数据到buffer中
length= recv(client_socket,buffer,BUFFER_SIZE,0);
if(length < 0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1]);
exit(1);
}
printf("%s",buffer);
bzero(buffer,BUFFER_SIZE);
strcat(buffer,argv[2]);
/*itoa(b,buffer,10);
*/
//向服务器发送buffer中的数据
send(client_socket,buffer,BUFFER_SIZE,0);
//关闭socket
close(client_socket);
}
char* itoa(int num,char *str,int radix)//number->string
{/*索引表*/
char index[]="0123456789ABCDEF";
unsigned unum;/*中间变量*/
int i=0,j,k;
/*确定unum的值*/
if(radix==10&&num<0)/*十进制负数*/
{
unum=(unsigned)-num;
str[i++]='-';
}
else unum=(unsigned)num;/*其他情况*/
/*转换*/
do{
str[i++]=index[unum%(unsigned)radix];
unum/=radix;
}while(unum);
str[i]='\0';
/*逆序*/
if(str[0]=='-')k=1;/*十进制负数*/
else k=0;
char temp;
for(j=k;j<=(i-1)/2;j++)
{
temp=str[j];
str[j]=str[i-1+k-j];
str[i-1+k-j]=temp;
}
return str;
}
int main(int argc, char **argv)
{
if (argc != 3)
{
printf("Usage: .\%s ServerIPAddress\n",argv[0]);
exit(1);
}
talk_to_server(argv);
return 0;
}
- 服务器
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <unistd.h> // for fork
#include <sys/signal.h> // for signal
#include <sys/wait.h> // for wait
#include <time.h>
#include <arpa/inet.h>
#define HELLO_WORLD_SERVER_PORT 6666
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
char* itoa(int num,char *str,int radix);
int CountWordsOfEuropeanTxtFile(char *szFileName);
int CountWordsInOneLine(const char *szLine);
void reaper(int sig)
{
int status;
//调用wait3读取子进程的返回值,使zombie状态的子进程彻底释放
while(wait3(&status,WNOHANG,(struct rusage*)0) >=0)
;
}
int main(int argc, char **argv)
{
//设置一个socket地址结构server_addr,代表服务器internet地址, 端口
struct sockaddr_in server_addr;
char a,b;
bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htons(INADDR_ANY);
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
time_t t;
t=time(NULL);
printf("服务器开始工作！\n");
//创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
int server_socket = socket(AF_INET,SOCK_STREAM,0);
if( server_socket < 0)
{
printf("Create Socket Failed!\n");
exit(1);
}
//把socket和socket地址结构联系起来
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!\n", HELLO_WORLD_SERVER_PORT);
exit(1);
}
//server_socket用于监听
if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
{
printf("Server Listen Failed!");
exit(1);
}
//通知操作系统,当收到子进程的退出信号(SIGCHLD)时,执行reaper函数,释放zombie状态的进程
(void)signal(SIGCHLD,reaper);
while (1) //服务器端要一直运行
{
//定义客户端的socket地址结构client_addr
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr);
//接受一个到server_socket代表的socket的一个连接
//如果没有连接请求,就等待到有连接请求--这是accept函数的特性
//accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信
//new_server_socket代表了服务器和客户端之间的一个通信通道
//accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中
int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
if ( new_server_socket < 0)
{
printf("Server Accept Failed!\n");
break;
}
int child_process_pid = fork(); //fork()后,子进程是主进程的拷贝
//在主进程和子进程中的区别是fork()的返回值不同.
if(child_process_pid == 0 )//如果当前进程是子进程,就执行与客户端的交互
{
close(server_socket); //子进程中不需要被复制过来的server_socket
char buffer[BUFFER_SIZE];
/*bzero(buffer, BUFFER_SIZE);//clean
strcpy(buffer,"20155219实现");
strcat(buffer,"\n");
printf("enter two numbers:\n");
scanf("%c %c",&a,&b);
strcat(buffer,&a);
strcat(buffer,&b); //C语言字符串连接
*/
//发送buffer中的字符串到new_server_socket,实际是给客户端
send(new_server_socket,buffer,BUFFER_SIZE,0);
printf("服务器实现者学号：20155219\n");
printf("当前时间： %s\n",ctime(&t));
send(new_server_socket,(void *)&t,sizeof(time_t),0);
bzero(buffer,BUFFER_SIZE);
//接收客户端发送来的信息到buffer中
length = recv(new_server_socket,buffer,BUFFER_SIZE,0);
if (length < 0)
{
printf("Server Recieve Data Failed!\n");
exit(1);
}
printf("\n%s\n",buffer);
int k=0;
char name[10];
while(*(buffer+k)!='\0')
{
name[k]=*(buffer+k);
k++;
}
printf("文件中单词个数%d\n",CountWordsOfEuropeanTxtFile(name));
bzero(buffer, BUFFER_SIZE);//clean
strcpy(buffer,"20155219实现");
strcat(buffer,"文件中单词个数");
strcat(buffer,itoa(CountWordsOfEuropeanTxtFile(name),buffer,10));
strcat(buffer,"\n");
send(new_server_socket,buffer,BUFFER_SIZE,0);
//关闭与客户端的连接
close(new_server_socket);
exit(0);
}
else if(child_process_pid > 0) //如果当前进程是主进程
close(new_server_socket); //主进程中不需要用于同客户端交互的new_server_socket
}
//关闭监听用的socket
close(server_socket);
return 0;
}
/***********************************************\
函数名称:
CountWordsOfEuropeanTxtFile
功能描述:
统计文件中单词个数
函数参数:
char *szFileName 文件名
返回值:
int 词的个数
\**********************************************/
int CountWordsOfEuropeanTxtFile(char *szFileName)
{
int nWords = 0;//词计数变量，初始值为0
FILE *fp; //文件指针
char carrBuffer[1024];//每行字符缓冲，每行最多1024个字符
//打开文件
if ((fp = fopen(szFileName, "r")) == NULL)
{
return -1; //文件打开不成功是返回-1
}
while (!feof(fp))//如果没有读到文件末尾
{
//从文件中读一行
if (fgets(carrBuffer, sizeof(carrBuffer),fp) != NULL)
//统计每行词数
nWords += CountWordsInOneLine(carrBuffer);
}
//关闭文件
fclose(fp);
return nWords;
}
/*
* 函数名称:
* CountWordsInOneLine
* 功能：统计一行正文中词的个数
* 参数：const char *szLine 一行正文
* 返回值：
* int 单词数
*/
int CountWordsInOneLine(const char *szLine)
{
int nWords = 0;
int i=0;
for (;i<strlen(szLine);i++)
{
if (*(szLine+i)!=' '&&(*(szLine+i+1)==' '||*(szLine+i+1)=='\n'))
{
nWords++;
while ((*(szLine+i)!=' ')&&(*(szLine+i+1)!='\0'))
{
i++;
}
}
}
//printf("%d\t",nWords);
return nWords;
}
char* itoa(int num,char *str,int radix)//number->string
{/*索引表*/
char index[]="0123456789ABCDEF";
unsigned unum;/*中间变量*/
int i=0,j,k;
/*确定unum的值*/
if(radix==10&&num<0)/*十进制负数*/
{
unum=(unsigned)-num;
str[i++]='-';
}
else unum=(unsigned)num;/*其他情况*/
/*转换*/
do{
str[i++]=index[unum%(unsigned)radix];
unum/=radix;
}while(unum);
str[i]='\0';
/*逆序*/
if(str[0]=='-')k=1;/*十进制负数*/
else k=0;
char temp;
for(j=k;j<=(i-1)/2;j++)
{
temp=str[j];
str[j]=str[i-1+k-j];
str[i-1+k-j]=temp;
}
return str;
}
实现如下图：
任务二
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
服务器端代码如下所示：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <pthread.h>
#define PORT 155228
#define BACKLOG 5
#define MAXDATASIZE 1000
void process_cli(int connfd, struct sockaddr_in client);
void *function(void* arg);
struct ARG {
int connfd;
struct sockaddr_in client;
};
main()
{
int listenfd,connfd;
pthread_t tid;
struct ARG *arg;
struct sockaddr_in server;
struct sockaddr_in client;
socklen_t len;
if ((listenfd =socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("Creatingsocket failed.");
exit(1);
}
int opt =SO_REUSEADDR;
setsockopt(listenfd,SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
bzero(&server,sizeof(server));
server.sin_family=AF_INET;
server.sin_port=htons(PORT);
server.sin_addr.s_addr= htonl (INADDR_ANY);
if (bind(listenfd,(struct sockaddr *)&server, sizeof(server)) == -1) {
perror("Bind()error.");
exit(1);
}
if(listen(listenfd,BACKLOG)== -1){
perror("listen()error\n");
exit(1);
}
len=sizeof(client);
while(1)
{
if ((connfd =accept(listenfd,(struct sockaddr *)&client,&len))==-1) {
perror("accept() error\n");
exit(1);
}
arg = (struct ARG *)malloc(sizeof(struct ARG));
arg->connfd =connfd;
memcpy((void*)&arg->client, &client, sizeof(client));
if(pthread_create(&tid, NULL, function, (void*)arg)) {
perror("Pthread_create() error");
exit(1);
}
}
close(listenfd);
}
void process_cli(int connfd, struct sockaddr_in client)
{
int num;
char recvbuf[MAXDATASIZE], sendbuf[MAXDATASIZE], cli_name[MAXDATASIZE];
printf("Yougot a connection from %s. \n ",inet_ntoa(client.sin_addr) );
num = recv(connfd,cli_name, MAXDATASIZE,0);
if (num == 0) {
close(connfd);
printf("Clientdisconnected.\n");
return;
}
cli_name[num - 1] ='\0';
printf("Client'sname is %s.\n",cli_name);
while (num =recv(connfd, recvbuf, MAXDATASIZE,0)) {
recvbuf[num] ='\0';
printf("Receivedclient( %s ) message: %s",cli_name, recvbuf);
int i;
for (i = 0; i <num - 1; i++) {
if((recvbuf[i]>='a'&&recvbuf[i]<='z')||(recvbuf[i]>='A'&&recvbuf[i]<='Z'))
{
recvbuf[i]=recvbuf[i]+ 3;
if((recvbuf[i]>'Z'&&recvbuf[i]<='Z'+3)||(recvbuf[i]>'z'))
recvbuf[i]=recvbuf[i]- 26;
}
sendbuf[i] =recvbuf[i];
}
sendbuf[num -1] = '\0';
send(connfd,sendbuf,strlen(sendbuf),0);
}
close(connfd);
}
void *function(void* arg)
{
struct ARG *info;
info = (struct ARG*)arg;
process_cli(info->connfd,info->client);
free (arg);
pthread_exit(NULL);
}
客户端代码如下：
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define PORT 155228
#define BACKLOG 5
#define MAXDATASIZE 1000
void process_cli(int connfd, struct sockaddr_in client);
main()
{
int listenfd, connfd;
pid_t pid;
struct sockaddr_in server;
struct sockaddr_in client;
int len;
if ((listenfd =socket(AF_INET, SOCK_STREAM, 0)) == -1) {
perror("Creatingsocket failed.");
exit(1);
}
int opt =SO_REUSEADDR;
setsockopt(listenfd,SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
bzero(&server,sizeof(server));
server.sin_family=AF_INET;
server.sin_port=htons(PORT);
server.sin_addr.s_addr= htonl (INADDR_ANY);
if (bind(listenfd,(struct sockaddr *)&server, sizeof(server)) == -1) {
perror("Bind()error.");
exit(1);
}
if(listen(listenfd,BACKLOG)== -1){
perror("listen() error\n");
exit(1);
}
len=sizeof(client);
while(1)
{
if ((connfd =accept(listenfd,(struct sockaddr *)&client,&len))==-1) {
perror("accept() error\n");
exit(1);
}
if ((pid=fork())>0){
close(connfd);
continue;
}
else if (pid==0) {
close(listenfd);
process_cli(connfd, client);
exit(0);
}
else {
printf("fork()error\n");
exit(0);
}
}
close(listenfd);
}
void process_cli(int connfd, struct sockaddr_in client)
{
int num;
char recvbuf[MAXDATASIZE], sendbuf[MAXDATASIZE], cli_name[MAXDATASIZE];
printf("Yougot a connection from %s. ",inet_ntoa(client.sin_addr) );
num = recv(connfd,cli_name, MAXDATASIZE,0);
if (num == 0)
{
close(connfd);
printf("Client disconnected.\n");
return;
}
cli_name[num - 1] ='\0';
printf("Client'sname is %s.\n",cli_name);
while (num =recv(connfd, recvbuf, MAXDATASIZE,0)) {
recvbuf[num] ='\0';
printf("Receivedclient( %s ) message: %s",cli_name, recvbuf);
int i = 0;
for (i = 0;i < num - 1; i++) {
if((recvbuf[i]>='a'&&recvbuf[i]<='z')||(recvbuf[i]>='A'&&recvbuf[i]<='Z'))
{
recvbuf[i]=recvbuf[i]+ 3;
if((recvbuf[i]>'Z'&&recvbuf[i]<='Z'+3)||(recvbuf[i]>'z'))
recvbuf[i]=recvbuf[i]- 26;
}
sendbuf[i] =recvbuf[i];
}
sendbuf[num - 1]= '\0';
send(connfd,sendbuf,strlen(sendbuf),0);
}
close(connfd);
}
实现结果如下图：
