def context_source(self):
try:
pc = pwngef.arch.CURRENT_ARCH.pc
symtabline = gdb.find_pc_line(pc)
symtab = symtabline.symtab
line_num = symtabline.line - 1 # we substract one because line number returned by gdb start at 1
if not symtab.is_valid():
return None
fpath = symtab.fullname()
with open(fpath, "r") as f:
lines = [l.rstrip() for l in f.readlines()]
except Exception:
return None
nb_line = self.get_setting("nb_lines_code")
fn = symtab.filename
if len(fn) > 20:
fn = "{}[...]{}".format(fn[:15], os.path.splitext(fn)[1])
title = "source:{}+{}".format(fn, line_num + 1)
cur_line_color = pwngef.config.get("theme.source_current_line")
self.context_title(title)
for i in range(line_num - nb_line + 1, line_num + nb_line):
if i < 0:
continue
if i < line_num:
print(
Color.grayify(" {:4d}\t {:s}".format(
i + 1,
lines[i],
)))
if i == line_num:
extra_info = self.get_pc_context_info(pc, lines[i])
prefix = "{}{:4d}\t ".format(config_arrow_right, i + 1)
leading = len(lines[i]) - len(lines[i].lstrip())
if extra_info:
print("{}{}".format(" " * (len(prefix) + leading),
extra_info))
print(
Color.colorify("{}{:s}".format(prefix, lines[i]),
cur_line_color))
if i > line_num:
try:
print(" {:4d}\t {:s}".format(
i + 1,
lines[i],
))
except IndexError:
break
return None
def context_code(self):
nb_insn = self.get_setting("nb_lines_code")
nb_insn_prev = self.get_setting("nb_lines_code_prev")
use_capstone = self.has_setting("use_capstone") and self.get_setting(
"use_capstone")
use_ida = self.get_setting("use_ida")
cur_insn_color = pwngef.config.get(
"theme.disassemble_current_instruction")
pc = int(pwngef.arch.CURRENT_ARCH.pc)
frame = gdb.selected_frame()
arch_name = "{}:{}".format(pwngef.arch.CURRENT_ARCH.arch.lower(),
pwngef.arch.CURRENT_ARCH.mode)
self.context_title("code:{}".format(arch_name))
try:
instruction_iterator = disass.capstone_disassemble if use_capstone else disass.gef_disassemble
instruction_iterator = disass.ida_disassemble if use_ida else instruction_iterator
for insn in instruction_iterator(pc, nb_insn,
nb_prev=nb_insn_prev):
line = []
is_taken = False
target = None
text = str(insn)
if insn.address < pc:
line += Color.grayify(" {}".format(text))
elif insn.address == pc:
line += Color.colorify(
"{:s}{:s}".format(config_arrow_right.rjust(3), text),
cur_insn_color)
if pwngef.arch.CURRENT_ARCH.is_conditional_branch(insn):
is_taken, reason = pwngef.arch.CURRENT_ARCH.is_branch_taken(
insn)
if is_taken:
target = insn.operands[-1].split()[0]
reason = "[Reason: {:s}]".format(
reason) if reason else ""
line += Color.colorify(
"\tTAKEN {:s}".format(reason), "bold green")
else:
reason = "[Reason: !({:s})]".format(
reason) if reason else ""
line += Color.colorify(
"\tNOT taken {:s}".format(reason), "bold red")
elif pwngef.arch.CURRENT_ARCH.is_call(
insn) and self.get_setting("peek_calls") is True:
target = insn.operands[-1].split()[0]
elif pwngef.arch.CURRENT_ARCH.is_ret(
insn) and self.get_setting("peek_ret") is True:
target = int(
pwngef.arch.CURRENT_ARCH.get_ra(insn, frame))
else:
line += " {}".format(text)
print("".join(line))
if target:
try:
target = int(target, 0)
except TypeError: # Already an int
pass
except ValueError:
# If the operand isn't an address right now we can't parse it
continue
for i, tinsn in enumerate(
instruction_iterator(target, nb_insn)):
text = " {} {}".format(
pwngef.config.DOWN_ARROW if i == 0 else " ",
str(tinsn))
print(text)
break
except gdb.MemoryError:
message.error("Cannot disassemble from $PC")
except Exception:
import traceback
print(traceback.format_exc())
return None