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core_translator.py
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core_translator.py
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#! /usr/bin/python
# -*- coding:utf-8 -*-
"""
Coredump Translator
Author: matrix
Date: 2019-02-14
"""
import pdb
import subprocess
import sys
import os
import errno
def safe_delete(filepath):
""" wrapper for os.remove """
try:
os.remove(filepath)
except OSError as err:
# don't care the ENOENT error
if err.errno != errno.ENOENT:
raise
def run_cmd(command):
"""
@arg1: command string
@ret: the result of after running command
"""
output = []
with open("/dev/null") as null:
proc = subprocess.Popen(command.split(), stdout=subprocess.PIPE,
stdin=subprocess.PIPE,
stderr=null)
while True:
data = proc.stdout.readline()
if data:
output.append(data)
else:
break
return output
class LoadMap(object):
""" Represent a load address map """
def __init__(self):
self._start_addr = None
self._end_addr = None
self._flag = None
self._path = None
def __str__(self):
ret = "Load Map:\r\n"
fmt = "%-15s %-15s %-5s %-s\r\n"
ret += fmt % ("Start Address", "End Address", "flag", "path")
ret += fmt % (hex(self._start_addr), hex(self._end_addr), self._flag, self._path)
return ret
@property
def start_addr(self):
return self._start_addr
@start_addr.setter
def start_addr(self, v):
self._start_addr = v
@property
def end_address(self):
return self._end_addr
@end_address.setter
def end_address(self, v):
self._end_addr = v
@property
def flag(self):
return self._flag
@flag.setter
def flag(self, v):
self._flag = v
@property
def path(self):
return self._path
@path.setter
def path(self, v):
if os.path.isfile(v):
self._path = v
else:
lib_suffix = ".so"
libname = v.split(lib_suffix)
if len(libname) > 1:
self._path = libname[0] + lib_suffix
else:
self._path = v
class CoreDump(object):
""" Represents a coredump file """
def __init__(self, core_file):
self.core_file = core_file
self.load_maps = []
def load(self):
quick_lookup_dict = dict()
output = run_cmd("readelf -n %s" % self.core_file)
new_map = None
for v in output:
items = v.split()
if len(items) == 3 and items[0].strip().startswith("0x"):
new_map = LoadMap()
new_map.start_addr = int(items[0], 16)
new_map.end_address = int(items[1], 16)
if new_map and len(items) == 1:
new_map.path = items[0].strip()
self.load_maps.append(new_map)
quick_lookup_dict[new_map.start_addr] = new_map
new_map = None
# find the flag only have RE of the load address
output = run_cmd("readelf -l %s" % self.core_file)
start_address = None
flag = None
for v in output:
items = v.split()
if len(items) == 4 and items[2].startswith("0x"):
start_address = int(items[2], 16)
continue
if start_address:
if v.find("R E") != -1:
load_map = quick_lookup_dict.get(start_address)
if load_map:
load_map.flag = "RE"
start_address = None
self.load_maps = [ m for m in self.load_maps if m.flag == "RE" ]
del quick_lookup_dict
def find_map(self, address):
for m in self.load_maps:
if address >= m.start_addr and address <= m.end_address:
return m
return None
class GDBController(object):
def __init__(self, core_file):
self.raw_stack = []
self.translated_strace = []
self.symbols = {}
self.core_file = core_file
self.coredump = CoreDump(core_file)
self.init()
def init(self):
self.coredump.load()
self.init_rawstack()
def init_rawstack(self):
output_file = "/tmp/coretrans.%s" % os.getpid()
gdb_script = "/tmp/coretrans.gdb.init.%s" % os.getpid()
cmd = "set logging file %s\n" % output_file
cmd += "core-file %s\n" % self.core_file
cmd += "set logging on\n"
cmd += "bt\nset logging off\nquit\n"
try:
with open(gdb_script, "w") as f:
f.write(cmd)
gdb_cmd = "gdb -x %s --batch-silent" % gdb_script
run_cmd(gdb_cmd)
with open(output_file, "r") as f:
for line in f:
stack = line.split()
if stack[0].strip().startswith("#") and line.find("in ??") != -1:
self.raw_stack.append(int(stack[1], 16))
except IOError:
pass
finally:
safe_delete(gdb_script)
safe_delete(output_file)
def get_filetype(self, path):
output = run_cmd("readelf -h %s" % path)
for line in output:
if line.find("Type:") != -1:
items = line.split()
return items[1]
return None
def add_symbol(self, path, load_addr):
is_changed = False
if path in self.symbols:
return is_changed
file_type = self.get_filetype(path)
text_offset = None
output = run_cmd("readelf -S %s" % path)
for line in output:
if line.find(".text") != -1:
items = line.split()
if len(items) == 5:
text_offset = int(items[3], 16)
if file_type == "DYN":
# dynamic object need relocation
self.symbols.setdefault(path, load_addr + text_offset)
is_changed = True
elif file_type == "EXEC":
self.symbols.setdefault(path, text_offset)
is_changed = True
break
return is_changed
def update(self):
output_file = "/tmp/coretrans.%s" % os.getpid()
gdb_script = "/tmp/coretrans.gdb.init.%s" % os.getpid()
cmd = "set logging file %s\n" % output_file
cmd += "core-file %s\n" % self.core_file
for path, text_addr in self.symbols.iteritems():
cmd += "add-symbol-file %s %s\n" % (path, hex(text_addr))
cmd += "set logging on\n"
cmd += "info register\n"
cmd += "bt\nset logging off\nquit\n"
try:
with open(gdb_script, "w") as f:
f.write(cmd)
gdb_cmd = "gdb -x %s --batch-silent" % gdb_script
run_cmd(gdb_cmd)
del self.translated_strace[:]
del self.raw_stack[:]
with open(output_file, "r") as f:
for line in f:
stack = line.split()
if stack[0].strip().startswith("#"):
if line.find("in ??") != -1:
self.raw_stack.append(int(stack[1], 16))
self.translated_strace.append(line[:-1])
except IOError:
pass
finally:
safe_delete(output_file)
safe_delete(gdb_script)
def translate(self):
try_again = False
for raw_stack in self.raw_stack:
m = self.coredump.find_map(raw_stack)
if m and self.add_symbol(m.path, m.start_addr):
try_again = True
if try_again:
self.update()
self.translate()
def show_stack(self):
print("Exception Information:")
if len(self.translated_strace) != 0:
for strace in self.translated_strace:
print(strace)
else:
print("\tNo exception found.")
# Entry point
if __name__ == "__main__":
if len(sys.argv) != 2:
print("Usage: %s <coredump filepath>" % sys.argv[0])
sys.exit(1)
try:
core_filepath = sys.argv[1]
if os.path.isfile(core_filepath):
controller = GDBController(core_filepath)
controller.translate()
controller.show_stack()
sys.exit(0)
else:
print("%s is invalid coredump file." % core_filepath)
sys.exit(1)
except Exception as e:
print("Failed to translate coredump: %s", e)
sys.exit(1)