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elf.py
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elf.py
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from struct import *
class phdr(object):
PT_TYPE = {
0: 'PT_NULL'
,1: 'PT_LOAD'
,2: 'PT_DYNAMIC'
,3: 'PT_INTERP'
,4: 'PT_NOTE'
,5: 'PT_SHLIB'
,6: 'PT_PHDR'
,7: 'PT_TLS'
,8: 'PT_NUM'
,0x6474e550: 'PT_GNU_EH_FRAME'
,0x6474e551: 'PT_GNU_STACK'
,0x6474e552: 'PT_GNU_RELRO'
}
PF_X = 1 << 0
PF_W = 1 << 1
PF_R = 1 << 2
def __init__(self,addr,is32,endi):
# extra
self.address = addr
self.is32 = is32
self.endianes = endi
self.p_type = None
self.p_offset = None
self.p_vaddr = None
self.p_paddr = None
self.p_filesz = None
self.p_memsz = None
self.p_flags = None
self.p_align = None
for k,v in self.PT_TYPE.items():
setattr(self,v,k)
def parse(self,mem): # whole file
fmt = self.endianes
if self.is32:
fmt += 'IIIIIIII'
( self.p_type \
, self.p_offset \
, self.p_vaddr \
, self.p_paddr \
, self.p_filesz \
, self.p_memsz \
, self.p_flags \
, self.p_align \
) = unpack_from(fmt,mem,self.address)
else:
fmt += 'IIQQQQQQ'
( self.p_type \
, self.p_flags \
, self.p_offset \
, self.p_vaddr \
, self.p_paddr \
, self.p_filesz \
, self.p_memsz \
, self.p_align \
) = unpack_from(fmt,mem,self.address)
def size(self,from_file = False):
ad = self.p_filesz if from_file else self.p_memsz
return self.align(ad)
def align(self,value):
a_s = self.p_align if self.p_align < 0x1000 else 0x1000
am = ~(a_s-1)
return (value + a_s) & am
def prety_flag(self):
ret = ''
ret += "R" if self.p_flags & self.PF_R else ' '
ret += "W" if self.p_flags & self.PF_W else ' '
ret += "X" if self.p_flags & self.PF_X else ' '
return ret
def dump(self):
if not self.p_type:
return ""
ret = ''
ret += "%s\t" % self.PT_TYPE[self.p_type]
ret += "%x " % self.p_offset
ret += "%x " % self.p_vaddr
ret += "%x " % self.p_paddr
ret += "%x " % self.p_filesz
ret += "%x " % self.p_memsz
ret += "%s " % self.prety_flag()
ret += "%x " % self.p_align
return ret
def __str__(self):
return self.dump()
class ehdr(object):
def __init__(self,mem=None):
self.mem = mem
self.e_ident = None
self.e_type = None
self.e_machine = None
self.e_version = None
self.e_entry = None
self.e_phoff = None
self.e_shoff = None
self.e_flags = None
self.e_ehsize = None
self.e_phentsize = None
self.e_phnum = None
self.e_shentsize = None
self.e_shnum = None
self.e_shstrndx = None
def parse(self,mem=None):
nmem = self.mem if not mem else mem
self.e_ident = unpack_from('16B',nmem,0)
self.is32 = self.e_ident[4] == 1
self.endines = '<' if self.e_ident[5] == 1 else '>'
fmt = self.endines
if self.is32:
fmt += 'HHIIIIIHHHHHH'
else:
fmt += 'HHIQQQIHHHHHH'
(self.e_type \
,self.e_machine \
,self.e_version \
,self.e_entry \
,self.e_phoff \
,self.e_shoff \
,self.e_flags \
,self.e_ehsize \
,self.e_phentsize \
,self.e_phnum \
,self.e_shentsize \
,self.e_shnum \
,self.e_shstrndx \
) = unpack_from(fmt,nmem,16)
return self
def enum_phdr(self):
if not self.e_ident and self.mem:
self.parse(self.mem)
if not self.e_ident:
print "[-] parse youre memory first dude"
return
for i in range(0,self.e_phnum):
addr = self.e_phoff + (i*self.e_phentsize)
#print "phdr @ %x" % addr
ph = phdr(addr,self.is32,self.endines)
ph.parse(self.mem)
yield ph