利用流套接字实现一个简单的远程控制系统.doc

四 川 大 学 计 算 机 学 院、软 件 学 院实 验 报 告 学号： 1143111172 姓名：柴承训 专业：软件学院 班级：09 第 3 周 课程名称 信息安全产品开发实践 实验课时1实验项目远程控制系统实验时间2013/9/27实验目的 流套接字与数据报套接字回顾 远程控制系统流程 实验环境 X86，Windows7，VMware9.0，Red Hat Enterprise Linux 5.0 实验内容（算法、程序、步骤和方法） 利用流套接字实现一个简单的远程控制系统：客户端输入“quit”,客户端程序与服务器端程序打印退出信息，终止程序的执行；客户输入命令，客户端将命令通过流套接字发送给客户端，服务器执行收到的命令，并将结果发送到客户端显示；如果没有客户输入的命令，服务器发送命令非法信息，并在客户端显示该条信息。编写实验报告：列出程序运行状态、截图、配文字说明；独立完成，打印报告，报告语言为中文，不少于4页A4，封面上书写姓名、学号。 （接上）实验内容（算法、程序、步骤和方法）修改代码：编译运行结果：源代码: udpclient.c/* * = * * Filename: udpclient.c * * Description: : This program is used to demostrate how to implement a udp rpc control server * * Version: 1.0 * Created: 2013骞?9鏈?5鏃?16鏃?6鍒?5绉? * Revision: none * Compiler: gcc * * Author: Gang liang * Organization: Computer Science College, Sichuan University * * = */#include #include #include #include #include #define PORT 8888#define SIZE 2048#include/* * = FUNCTION = * Name: print_useage * Description: * = */void print_usage (char* cmd )fprintf(stderr,Usage:%s ip addressn,cmd);/* - end of function print_useage - */* * = FUNCTION = * Name: main * Description: * = */intmain ( int argc, char *argv )int sockfd;struct sockaddr_in client;struct sockaddr_in server;int len;int port;int rvalue;char bufferSIZE;char cmd10; /* these two vars used to deal with cd command */char path2028;/initsockfd=-1;bzero(&client,sizeof(struct sockaddr);bzero(&server,sizeof(struct sockaddr);len=-1;rvalue=-1;port=PORT;memset(buffer,0,sizeof(buffer);bzero(cmd,10);/bzero(path,2048);if (2!=argc)print_usage(argv0);exit(-1);/phrase 1: The creation of the socketsockfd=socket(AF_INET,SOCK_STREAM,0);if (-1=sockfd)fprintf(stderr,error in creating socketn);exit(-1);/Communation with the server.Attention:Client should send data to the server first./Set the destinations addressserver.sin_family=AF_INET;server.sin_addr.s_addr=inet_addr(argv1);server.sin_port=htons(port);if (-1=connect(sockfd,(struct sockaddr*)&server,sizeof(server)perror(connect errorn);close(sockfd);return -1;while(1)fprintf(stderr,TCP);fgets(buffer,SIZE,stdin);rvalue=write(sockfd,buffer,strlen(buffer),0);if (0=strcmp(buffer,quitn)|(0=strcmp(buffer,QUITN)fprintf(stderr,quit.n);break;if (0rvalue)fprintf(stderr,error in receiving datan);continue;sscanf(buffer,%s,cmd);if (0=strcmp(cd,cmd)|(0=strcmp(CD,cmd)continue;len=sizeof(struct sockaddr);rvalue=read(sockfd,buffer,SIZE,0);if (0rvalue)bufferrvalue=0;fprintf(stderr,%sn,buffer);elsecontinue;close(sockfd);return EXIT_SUCCESS;/* - end of function main - */Udpserver.c/* * = * * Filename: udpserver.c * * Description: This program is used to demostrate how to implement a udp rpc server * * Version: 1.0 * Created: 2013骞?9鏈?4鏃?20鏃?9鍒?2绉? * Revision: none * Compiler: gcc * * Author: Gang Liang * Organization: Computer Science College, Sichuan Universtiy * * = */#include #include #include #include #include #include#definePORT 8888/*server port */#defineSIZE 2048/* 2K BUFFER */int exec (char* command,char* result)FILE * in;int len;char c;len=0;bzero(result,sizeof(result);in=popen(command,r);if (NULL=in)fprintf(stderr,error in create a pipen);return -1;while(c=fgetc(in)!=EOF)&(lenrvalue)fprintf(stderr,error in receiving datan);continue;recv_bufrvalue-1=0;if (0=strcmp(recv_buf,quit)fprintf(stderr,the client is quitn);close(connected);break;sscanf(recv_buf,%s %s,cmd,path);if (0=strcmp(cd,cmd) |(0=strcmp(CD,cmd)chdir(path);continue;fprintf(stderr,the result is n%s,send_buf);exec(recv_buf,send_buf);rvalue=-1;rvalue=write(connected,send_buf,strlen(send_buf);if (0rvalue)fprintf(stderr,error in sending datan);continue;close(connected);/phrase 4:release the socketclose(sockfd);return EXIT_SUCCESS;/* - end of function main - */数据记录和计算 TCP套接字编程（cont.）：工作原理： 客户端接收用户输入的命令，客户端通过套