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基于C语言采用UDP协议实现远程控制|详细说明|利用流套接字实现一个简单的远程控制系统
代码
客户端
#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<string.h>
#include<netdb.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.h>
#define PORT 8900
#define BUF_SIZE 2048
void print_usage(char* str)
{
printf("%s usage :\n",str);
printf("%s Ipaddr \n");
}
int main(int argc, char** argv)
{
int sockfd;
struct sockaddr_in client;
struct sockaddr_in server;
char send_buf[BUF_SIZE];
char recv_buf[BUF_SIZE];
int sendnum;
int recvnum;
int length;
int port;
int input_len;
if(2!=argc)
{
print_usage(argv[0]);
exit(1);
}
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 = inet_addr(argv[1]);
server.sin_port = htons(port);
length = sizeof(struct sockaddr);
while(1)
{
printf("udp>");
fgets(send_buf,BUF_SIZE,stdin);
input_len=strlen(send_buf);
send_buf[input_len-1]='\0';
printf("\n");
if (0>sendto(sockfd,send_buf,strlen(send_buf),0,(struct sockaddr*)&server,length))
{
perror("error occar in sending data\n");
break;
}
if (0==strcmp(send_buf,"quit"))
{
perror("quitting remote ctroling\n");
break;
}
if (0>recvfrom(sockfd,recv_buf,sizeof(recv_buf),0,(struct sockaddr*)&client,&length))
{
perror("error occar in receiving data\n");
break;
}
fprintf(stdout,"%s\n",recv_buf);
}
close(sockfd);
exit(1);
}
服务端
#include<stdio.h>
#include<unistd.h>
#include<sys/socket.h>
#include<string.h>
#include<netdb.h>
#include<netinet/in.h>
#include<arpa/inet.h>
#include<stdlib.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;
}
if (1)
{
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;
}
END
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