信息安全實(shí)踐第四次作業(yè)遠(yuǎn)程控制系統(tǒng)

1、四 川 大 學(xué) 計(jì) 算 機(jī) 學(xué) 院、軟 件 學(xué) 院實(shí) 驗(yàn) 報(bào) 告 學(xué)號(hào)： 姓名：專(zhuān)業(yè)： 班級(jí)： 第 3 周 課程名稱 信息安全產(chǎn)品開(kāi)發(fā)實(shí)踐  實(shí)驗(yàn)課時(shí)4實(shí)驗(yàn)項(xiàng)目遠(yuǎn)程控制系統(tǒng)實(shí)驗(yàn)時(shí)間2013.9.27實(shí)驗(yàn)?zāi)康?利用流套接字實(shí)現(xiàn)一個(gè)簡(jiǎn)單的遠(yuǎn)程控制系統(tǒng)  實(shí)驗(yàn)環(huán)境 虛擬機(jī) Ubuntu-VMware Workstation  實(shí)驗(yàn)內(nèi)容（算法、程序、步驟和方法） 服務(wù)器服務(wù)器代碼中有兩個(gè)死循環(huán)，外部是為了重復(fù)連接客戶端（即使對(duì)方斷了此次連接仍然能繼續(xù)等待并連接下一客戶端），要注意每連接一次客戶端套接字都會(huì)不同，而且除了連接客戶端的套接字以外還有監(jiān)聽(tīng)套接字。#include

2、<stdlib.h>#include<stdio.h>#include<sys/socket.h>#include<netdb.h>#include<string.h>#include<unistd.h>#include<netinet/in.h>#include<arpa/inet.h>#define PORT 8900#defineSIZE 2048/* 2K BUFFER */void exec (char* command,char* result)FILE * in;int len;cha

3、r 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)&&(len<SIZE)resultlen=c;len+;resultlen='0'pclose(in);if (0=len)sprintf(result,"%s cannot executen",comm

4、and);int main(int argc,char* argv)struct sockaddr_in server;struct sockaddr_in client;int len;int port;int listend;int connectd;int sendnum;int opt;int recvnum;char send_buf2048;char recv_buf2048;int rvalue;char cmd10; /* these two var used to deal with cd command */char path2048;port= PORT;memset(s

5、end_buf,0,2048);memset(recv_buf,0,2048);opt = SO_REUSEADDR;if (-1=(listend=socket(AF_INET,SOCK_STREAM,0)/使用TCP創(chuàng)建監(jiān)聽(tīng)用的套接字perror("create listen socket errorn");exit(1);setsockopt(listend,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt);#ifdef DEBUGprintf("the listen id is %dn",listend);

6、#endifmemset(&server,0,sizeof(struct sockaddr_in);server.sin_family = AF_INET;/IPv4協(xié)議server.sin_addr.s_addr = htonl(INADDR_ANY);/接收任意地址server.sin_port = htons(port);/設(shè)置端口號(hào)if (-1=bind(listend,(struct sockaddr *)&server,sizeof(struct sockaddr)/綁定perror("bind errorn");exit(1); if (-1=

7、listen(listend,5) perror("listen errorn");exit(1); while(1)/外部死循環(huán)，用來(lái)重復(fù)連接客戶端if (-1=(connectd=accept(listend,(struct sockaddr*)&client,&len)/創(chuàng)建新的套接字連接客戶端perror("create connect socket errorn");continue;while (1)memset(recv_buf,0,2048);#ifdef DEBUGprintf("the connect id

8、is %d",connect);printf("the client ip addr is %s",inet_ntoa(client.sin_addr);#endif#ifdef DEBUGprintf("the send num is %d",sendnum);printf("the client ip addr is %s",inet_ntoa(client.sin_addr);#endifif (0>(recvnum = recv(connectd,recv_buf,sizeof(recv_buf),0)perr

9、or("recv errorn");close(connectd);continue;recv_bufrecvnum-1='0'/這里要注意-1，不然會(huì)保留換行符if (0=strcmp(recv_buf,"quit")|(0=strcmp(recv_buf,"QUIT")/結(jié)束對(duì)話，跳出內(nèi)部循環(huán)，繼續(xù)外部循環(huán)printf("overn");break;sscanf(recv_buf,"%s %s",cmd,path);if (0=strcmp("cd",cm

10、d) |(0=strcmp("CD",cmd)chdir(path);continue;exec(recv_buf,send_buf);rvalue=-1;rvalue=send(connectd,send_buf,sizeof(send_buf),0); close(listend); return 0;  （接上）實(shí)驗(yàn)內(nèi)容（算法、程序、步驟和方法）客戶端客戶端代碼中只有一個(gè)死循環(huán)，和上次實(shí)驗(yàn)差別不大。#include<stdlib.h>#include<stdio.h>#include<sys/socket.h>#inclu

11、de<netdb.h>#include<string.h>#include<unistd.h>#include<netinet/in.h>#include<arpa/inet.h>#define SIZE 2048void print_usage (char* cmd )fprintf(stderr,"Usage:%s ip addressn",cmd);int main(int argc,char* argv)struct sockaddr_in server;int ret;int len;int port;i

12、nt sockfd;int sendnum;int recvnum;char send_buf2048;char recv_buf2048;int rvalue;char bufferSIZE;char cmd10; if (2>argc)| (argc >3)print_usage(argv0);exit(1);if (3=argc) /這里的端口號(hào)從主函數(shù)參數(shù)獲取port = atoi(argv2);if (-1=(sockfd=socket(AF_INET,SOCK_STREAM,0)perror("can not create socketn");exi

13、t(1);memset(&server,0,sizeof(struct sockaddr_in);server.sin_family = AF_INET;server.sin_addr.s_addr = inet_addr(argv1);server.sin_port = htons(port);if (0>(ret=connect(sockfd,(struct sockaddr*)&server,sizeof(struct sockaddr)perror("connect error");close(sockfd);exit(1);while(1)/

14、這邊只需一個(gè)死循環(huán)memset(buffer,0,2048);fprintf(stderr,"TCP>");fgets(buffer,SIZE,stdin);rvalue=send(sockfd,buffer,strlen(buffer),0);if (0=strcmp(buffer,"quitn")|(0=strcmp(buffer,"QUITn")/結(jié)束對(duì)話close(sockfd);break;if (0>rvalue)fprintf(stderr,"error in receiving datan");continue;sscanf(buffer,"%s",cmd);if (0=strcmp("cd",cmd)|(0=strcmp("CD",cmd)continue;/如果是cd命令則沒(méi)有返回內(nèi)容直接重新開(kāi)始循環(huán)len=sizeof(struct sockaddr);if (0>(len=recv(sockfd,buffer,2048,0)perror("recv data errorn");close(sockfd);exit(1);bufferlen='0'printf(&