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pydbgc.py
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#!c:\python\python.exe
"""
PyDbg Just-In-Time Debugger
Copyright (C) 2006 Cody Pierce <codyrpierce@gmail.com>
$Id: pydbgc.py 233 2009-02-12 19:01:53Z codyrpierce $
Description:
This quick and dirty hack gives you a PyDbg command line console with WinDbg-esque commands. One of the cooler
features of this hack is the ability to step backwards. Yes really, you can step backwards.
"""
import sys, struct, string, re, signal
# This should point to paimei if its not in site-packages
#sys.path.append("C:\\code\\python\\paimei")
from ctypes import *
kernel32 = windll.kernel32
from pydbg import *
from pydbg.defines import *
class PydbgClient:
####################################################################################################################
def __init__(self, dbg="", attach_breakpoint=True):
self.dbg = dbg
self.attach_breakpoint = attach_breakpoint
self.steps = []
self.breakpoints = []
self.commands = []
self.commands.append({"command": "bc", "description": "Clear breakpoints", "handler": self.clear_breakpoints})
self.commands.append({"command": "bd", "description": "Delete a breakpoint (ex: db 2)", "handler": self.delete_breakpoint})
self.commands.append({"command": "bl", "description": "List breakpoints", "handler": self.list_breakpoints})
self.commands.append({"command": "bp", "description": "Set a breakpoint (ex: bp 7ffdb000)", "handler": self.breakpoint})
self.commands.append({"command": "dc", "description": "Dump Data Charactes", "handler": self.dump_data_characters})
self.commands.append({"command": "dd", "description": "Dump Data", "handler": self.dump_data})
self.commands.append({"command": "g", "description": "Resume Execution", "handler": self.go})
self.commands.append({"command": "h", "description": "Help", "handler": self.print_help})
self.commands.append({"command": "help", "description": "Help", "handler": self.print_help})
self.commands.append({"command": "k", "description": "Call Stack", "handler": self.call_stack})
self.commands.append({"command": "quit", "description": "Quit", "handler": self.quit})
self.commands.append({"command": "r", "description": "Modify a register (ex: r eax=10)", "handler": self.register})
self.commands.append({"command": "s", "description": "Single Step", "handler": self.single_step})
self.commands.append({"command": "sb", "description": "Single Step Backwards", "handler": self.step_back})
self.commands.append({"command": "seh", "description": "Current SEH", "handler": self.seh})
self.commands.append({"command": "u", "description": "Disassemble (ex: u 7ffdb000", "handler": self.disassemble})
####################################################################################################################
def breakpoint_handler(self, dbg):
self.dbg = dbg
# Initial module bp
if dbg.first_breakpoint:
if self.attach_breakpoint:
signal.signal(signal.SIGBREAK, self.interrupt_handler)
self.command_line()
return DBG_CONTINUE
self.command_line()
return DBG_CONTINUE
####################################################################################################################
def single_step_handler(self, dbg):
self.dbg = dbg
self.command_line()
return DBG_CONTINUE
####################################################################################################################
def interrupt_handler(self, signum, frame):
#
# I gotta figure out how to get a signal in pydbg back here
sys.stdout.write("\n[*] Catching signal %d\n" % signum)
if not kernel32.DebugBreakProcess(self.dbg.h_process):
sys.stdout.write("[!] Problem breaking into process\n")
return DBG_CONTINUE
####################################################################################################################
def record_step(self):
step = {}
stack = ""
(stacktop, stackbottom) = self.dbg.stack_range()
current = stackbottom
stack = self.dbg.read(current, stacktop - stackbottom)
step["context"] = self.dbg.context
step["stacktop"] = stacktop
step["stackbottom"] = stackbottom
step["stack"] = stack
self.steps.append(step)
return 0
####################################################################################################################
def command_line(self):
self.print_state()
while True:
sys.stdout.write("pydbgc> ")
commandline = sys.stdin.readline().rstrip('\n')
if re.search(' ', commandline):
(command, args) = commandline.split(' ', 1)
else:
command = commandline
args = ""
rc = self.process_command(command, args)
if rc == 1:
return True
sys.stdout.write("\n")
return False
####################################################################################################################
def print_state(self):
#address = self.dbg.exception_address
address = self.get_reg_value("eip")
instruction = self.dbg.get_instruction(address)
'''
eax=7ffdf000 ebx=00000001 ecx=00000002 edx=00000003 esi=00000004 edi=00000005
eip=7c901230 esp=0092ffcc ebp=0092fff4 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=0038 gs=0000 efl=00000246
ntdll!DbgBreakPoint:
7c901230 cc int 3
'''
try:
module = self.dbg.addr_to_module(address).szModule
except:
module = "N/A"
sys.stdout.write("\n")
sys.stdout.write("eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n" %
(self.get_reg_value("eax"), self.get_reg_value("ebx"), self.get_reg_value("ecx"),
self.get_reg_value("edx"), self.get_reg_value("esi"), self.get_reg_value("edi")))
sys.stdout.write("eip=%08x esp=%08x ebp=%08x\n\n" %
(self.get_reg_value("eip"), self.get_reg_value("esp"), self.get_reg_value("ebp")))
sys.stdout.write("%s!%08x %s\n\n" %
(module, address, self.dbg.disasm(address)))
return 0
####################################################################################################################
def process_command(self, command, args):
for c in self.commands:
if command == c["command"]:
rc = c["handler"](args)
return rc
sys.stdout.write("Unknown command %s" % command)
return -1
####################################################################################################################
def go(self, *arguments, **keywords):
self.dbg.single_step(False)
sys.stdout.write("\nContinuing\n")
return 1
####################################################################################################################
def breakpoint(self, *arguments, **keywords):
try:
address = string.atol(arguments[0], 16)
except:
sys.stdout.write("Syntax error\n")
return -1
self.dbg.bp_set(address, restore=True, handler=self.breakpoint_handler)
self.breakpoints.append(address)
return 0
####################################################################################################################
def disassemble(self, *arguments, **keywords):
try:
address = string.atol(arguments[0], 16)
except:
sys.stdout.write("Syntax error\n")
return -1
sys.stdout.write(self.dbg.disasm(address))
return 0
####################################################################################################################
def list_breakpoints(self, *arguments, **keywords):
for i in xrange(0, len(self.breakpoints)):
address = self.breakpoints[i]
sys.stdout.write("[%d] %s!%08x\n" %
(i, self.dbg.addr_to_module(address).szModule, address))
return 0
####################################################################################################################
def clear_breakpoints(self, *arguments, **keywords):
for address in self.breakpoints:
self.dbg.bp_del(address)
self.breakpoints = []
return 0
####################################################################################################################
def delete_breakpoint(self, *arguments, **keywords):
try:
bp = int(arguments[0])
except:
sys.stdout.write("Syntax error\n")
return -1
self.dbg.bp_del(self.breakpoints[bp])
self.breakpoints.remove(self.breakpoints[bp])
return 0
####################################################################################################################
def single_step(self, *arguments, **keywords):
self.record_step()
self.dbg.single_step(True)
return 1
####################################################################################################################
def step_back(self, *arguments, **keywords):
step = self.steps.pop()
context = step["context"]
stack = step["stack"]
current = step["stackbottom"]
self.dbg.write(current, stack)
self.dbg.set_thread_context(context)
self.print_state()
return 0
####################################################################################################################
def register(self, *arguments, **keywords):
arg1 = arguments[0].strip()
if not re.search('=', arg1):
self.print_state()
return 0
try:
(register, value) = re.split('=', arg1)
register = register.strip()
value = string.atol(value.strip())
except:
sys.stdout.write("Syntax error\n")
return -1
self.set_reg_value(register, value)
return 0
####################################################################################################################
def dump_data(self, *arguments, **keywords):
display = 128
length = 0
arg1 = arguments[0].strip()
try:
if re.search('\+', arg1):
(address, offset) = arg1.split('+', 1)
if re.search('[g-x]', address, re.I):
address = self.get_reg_value(address)
else:
address = string.atol(address.stip(), 16)
address = address + int(offset.strip())
elif re.search('-', arg1):
(address, offset) = arg1.split('-', 1)
address = string.atol(address.strip(), 16) - int(offset.strip())
else:
if re.search('[g-x]', arg1, re.I):
address = self.get_reg_value(arg1)
else:
address = string.atol(arg1, 16)
except:
sys.stdout.write("Syntax error\n")
return -1
while length <= display:
if not length % 32:
sys.stdout.write("\n%08x: " % (address + length))
else:
sys.stdout.write(" ")
try:
bytes = self.dbg.read(address + length, 4)
sys.stdout.write("%08x" % (self.dbg.flip_endian_dword(bytes)))
except:
sys.stdout.write("????????")
length += 4
sys.stdout.write("\n")
return 0
####################################################################################################################
def dump_data_characters(self, *arguments, **keywords):
# Todo
return 0
####################################################################################################################
def call_stack(self, *arguments, **keywords):
callstack = self.dbg.stack_unwind()
for address in callstack:
sys.stdout.write("%s!%x\n" % (self.dbg.addr_to_module(address).szModule, address))
return 0
####################################################################################################################
def seh(self, *arguments, **keywords):
seh = self.dbg.seh_unwind()
for address, handler in seh:
sys.stdout.write("%x: %x\n" % (address, handler))
return 0
####################################################################################################################
def quit(self, *arguments, **keywords):
self.clear_breakpoints()
self.steps = []
return 1
####################################################################################################################
def print_help(self, *arguments, **keywords):
sys.stdout.write("\n")
for command in self.commands:
sys.stdout.write("\t%s:\t%s\n" % (command["command"], command["description"]))
return 0
####################################################################################################################
def get_reg_value(self, register):
context = self.dbg.get_thread_context(self.dbg.h_thread)
if register == "eax" or register == 0: return context.Eax
elif register == "ecx" or register == 1: return context.Ecx
elif register == "edx" or register == 2: return context.Edx
elif register == "ebx" or register == 3: return context.Ebx
elif register == "esp" or register == 4: return context.Esp
elif register == "ebp" or register == 5: return context.Ebp
elif register == "esi" or register == 6: return context.Esi
elif register == "edi" or register == 7: return context.Edi
elif register == "eip" or register == 8: return context.Eip
return False
####################################################################################################################
def set_reg_value(self, register, value):
context = self.dbg.get_thread_context(self.dbg.h_thread)
if register == "eax" or register == 0: context.Eax = value
elif register == "ecx" or register == 1: context.Ecx = value
elif register == "edx" or register == 2: context.Edx = value
elif register == "ebx" or register == 3: context.Ebx = value
elif register == "esp" or register == 4: context.Esp = value
elif register == "ebp" or register == 5: context.Ebp = value
elif register == "esi" or register == 6: context.Esi = value
elif register == "edi" or register == 7: context.Edi = value
elif register == "eip" or register == 8: context.Eip = value
self.dbg.set_thread_context(context)
return True
########################################################################################################################
if __name__ == "__main__":
def attach_target_proc(dbg, procname):
'''
Attaches to procname if it finds it otherwise loads.
'''
imagename = procname.rsplit('\\')[-1]
print "[*] Trying to attach to existing %s" % imagename
for (pid, name) in dbg.enumerate_processes():
if imagename in name:
try:
print "[*] Attaching to %s (%d)" % (name, pid)
dbg.attach(pid)
except:
print "[!] Problem attaching to %s" % name
return False
return True
try:
print "[*] Trying to load %s" % (procname)
dbg.load(procname, "")
except:
print "[!] Problem loading %s" % (procname)
return False
return True
####################################################################################################################
if len(sys.argv) < 2 or len(sys.argv) > 3:
print "%s <process name> [attach breakpoint]" % sys.argv[0]
sys.exit(-1)
elif len(sys.argv) == 3:
option = int(sys.argv[2])
if option == 1:
ab = True
else:
ab = False
process = sys.argv[1]
dbg = pydbg()
pydbgc = PydbgClient(attach_breakpoint=ab)
dbg.pydbgc = pydbgc
dbg.set_callback(EXCEPTION_BREAKPOINT, dbg.pydbgc.breakpoint_handler)
dbg.set_callback(EXCEPTION_SINGLE_STEP, dbg.pydbgc.single_step_handler)
if not attach_target_proc(dbg, process):
print "[!] Couldnt load/attach to %s" % process
sys.exit(-1)
dbg.debug_event_loop()