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import os
from miasm2.jitter.csts import PAGE_READ, PAGE_WRITE
BASE_SB_PATH = "file_sb"
def get_str_ansi(jitter, ad_str, max_char=None):
l = 0
tmp = ad_str
while ((max_char is None or l < max_char) and
jitter.vm.get_mem(tmp, 1) != "\x00"):
tmp += 1
l += 1
return jitter.vm.get_mem(ad_str, l)
def get_str_unic(jitter, ad_str, max_char=None):
l = 0
tmp = ad_str
while ((max_char is None or l < max_char) and
jitter.vm.get_mem(tmp, 2) != "\x00\x00"):
tmp += 2
l += 2
s = jitter.vm.get_mem(ad_str, l)
# TODO: real unicode decoding
s = s[::2]
return s
def set_str_ansi(s):
return s + "\x00"
def set_str_unic(s):
# TODO: real unicode encoding
return "\x00".join(list(s)) + '\x00' * 3
class heap(object):
"Light heap simulation"
addr = 0x20000000
align = 0x1000
size = 32
mask = (1<< size) - 1
def next_addr(self, size):
"""
@size: the size to allocate
return the future checnk address
"""
ret = self.addr
self.addr = (self.addr + size + self.align - 1)
self.addr &= self.mask ^ (self.align - 1)
return ret
def alloc(self, jitter, size):
"""
@jitter: a jitter instance
@size: the size to allocate
"""
addr = self.next_addr(size)
jitter.vm.add_memory_page(addr, PAGE_READ | PAGE_WRITE, "\x00" * size)
return addr
def windows_to_sbpath(path):
"""Convert a Windows path to a valid filename within the sandbox
base directory.
"""
path = [elt for elt in path.lower().replace('/', '_').split('\\') if elt]
return os.path.join(BASE_SB_PATH, *path)
def unix_to_sbpath(path):
"""Convert a POSIX path to a valid filename within the sandbox
base directory.
"""
path = [elt for elt in path.split('/') if elt]
return os.path.join(BASE_SB_PATH, *path)
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