Socket远程执行命令并结果回传（客户端）

/*
*客户端,执行命令，回传执行结果
*By rekken
*/

#include <sys/types.h>

#include <sys/socket.h>

#include <stdlib.h>

#include <stdio.h>

#include <errno.h>

#include <netinet/in.h>

#include <unistd.h>

#include <string.h>

#define SERVERPORT 3490

#define BACKLOG 10

#define MAX_CONNECTED_NO 10

#define MAXDATASIZE 120

int main()

{

//declare the variable
to be used

FILE *pp;; //used
for file handle, pp used as buf after doing command

char sendout[65535]; //used
for store the data retrived from the file

struct sockaddr_in server_sockaddr,client_sockaddr; //for create socket

int sin_size,recvbytes,sendbytes; //recv
and send used for recv()
and send()

int sockfd,client_fd; //for socket creation

char buf[MAXDATASIZE]; //store the file dir from recv()

char output[MAXDATASIZE];

//creat socket connection

if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1){

perror("socket");

exit(1);

}

printf("socket success!,sockfd=%d\n",sockfd);

//set relevant parameters
in the socketr_in struct

server_sockaddr.sin_family=AF_INET;

server_sockaddr.sin_port=htons(SERVERPORT);

server_sockaddr.sin_addr.s_addr=INADDR_ANY;

bzero(&(server_sockaddr.sin_zero),8);

//bind the sockfd
and port

if(bind(sockfd,(struct sockaddr
*)&server_sockaddr,sizeof(struct sockaddr))==-1){

perror("bind");

exit(1);

}

printf("bind success!\n");

//begin
to listen

if(listen(sockfd,BACKLOG)==-1){

perror("listen");

exit(1);

}

printf("listening....\n");

//call the accept(),wait
for the peer's connecting

if((client_fd=accept(sockfd,(struct
sockaddr *)&client_sockaddr,&sin_size))==-1){

perror("accept");

exit(1);

}

//receive the data from the peer

if((recvbytes=recv(client_fd,buf,sizeof(buf),0))==-1){

perror("recv");

exit(1);

}

//do the received command

if((pp
= popen(buf,
"r"))
==
NULL )

{

printf("popen error!\n");

return 0;

}

while(fgets(output, 255, pp))

{

printf("%s", output);

if((sendbytes=send(client_fd,output,strlen(output),0))==-1){

perror("send file");

exit(1);

}

printf("send data length:%d\n",sendbytes);

}

pclose(pp);

close(sockfd);

return 1;

}

/*

*讲命令执行部分封装

*/

int do_command(int sockfd,char
*command,char
*output)//sockfd套接字用于结果回传，command为待执行命令，output存放执行结果

{

FILE *pp;

int count_byte=0;

if((pp
= popen(command,
"r"))
==
NULL )

{

printf("popen error!\n");

return 0;

}

while(!feof(pp)){//判断文件尾，下两行用于将文件内容保存在output中

output[count_byte]=fgetc(pp);

count_byte++;

}

if((send(sockfd,output,count_byte,0))==-1){//将执行结果发送回请求端

perror("send file");

exit(1);

}

pclose(pp);

return count_byte;//返回值为传送字节数

}