安全产品开发实践远程控制系统-内含源码和说明书(可自己修改).zip

/******************************************************************************\ * *\ * *\ * *\ * program name: udpserver1.c *\ * Author: liang gang & Hu xiao-qin *\ * Function: remote control system server *\ * Aim: To tell students how to use socket to implement a simple*\ * remote control system *\ * date:03-11-2009 *\ * *\ * *\ *******************************************************************************/ #include<stdio.h> #include<unistd.h> #include<sys/socket.h> #include<string.h> #include<netdb.h> #include<netinet/in.h> #include<arpa/inet.h> #define PORT 8900 #define BUF_SIZE 2048 int execute(char* command,char* buf); int main() { int sockfd; struct sockaddr_in client; struct sockaddr_in server; char send_buf[BUF_SIZE]; char recv_buf[BUF_SIZE]; char cmd[2048]; int sendnum; int recvnum; int length; int port; memset(send_buf,0,2048); memset(recv_buf,0,2048); port = PORT; if (-1==(sockfd=socket(AF_INET,SOCK_DGRAM,0))) { perror("generating socket error\n"); exit(1); } memset(&server,0,sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_addr.s_addr = htonl(INADDR_ANY); server.sin_port = htons(port); if (-1==bind(sockfd,(struct sockaddr*)&server,sizeof(struct sockaddr))) { perror("binding error\n"); close(sockfd); exit(1); } length = sizeof(struct sockaddr_in); while(1) { memset(recv_buf,0,2048); memset(send_buf,0,2048); if(0>(recvnum = recvfrom(sockfd,recv_buf,sizeof(recv_buf),0,(struct sockaddr*)&client,&length))) { perror("error in recving data...\n"); break; } recv_buf[recvnum]='\0'; if (0==strcmp(recv_buf,"quit")) { perror("quitting remote controling\n"); break; } printf("the message is: %s\n",recv_buf); strcpy(cmd,"/bin/"); strcat(cmd,recv_buf); execute(cmd,send_buf); if ('\0'==*send_buf) { memset(cmd,0,sizeof(cmd)); strcpy(cmd,"/sbin/"); strcat(cmd,recv_buf); execute(cmd,send_buf); if ('\0'==*send_buf) { memset(cmd,0,sizeof(cmd)); strcpy(cmd,"/usr/bin/"); strcat(cmd,recv_buf); execute(cmd,send_buf); } if ('\0'==*send_buf) { memset(cmd,0,sizeof(cmd)); strcpy(cmd,"/usr/sbin/"); strcat(cmd,recv_buf); execute(cmd,send_buf); } } if ('\0'==*send_buf) sprintf(send_buf,"command is not vaild,check it please\n"); printf("the server message is:%s\n",send_buf); if (0>sendto(sockfd,send_buf,sizeof(send_buf),0,(struct sockaddr*)&client,length)) { perror("sending data error\n"); break; } } close(sockfd); exit(1); } int execute(char* command,char* buf) { FILE * fp; int count; if (NULL==(fp = popen(command,"r"))) { perror("creating pipe error\n"); exit(1); } count = 0 ; while(((buf[count] = fgetc(fp))!=EOF)&&count<2047) count++; buf[count]='\0'; pclose(fp); return count; }