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#!/usr/bin/env python
from ptrace import PtraceError
from ptrace.debugger import (PtraceDebugger, Application,
ProcessExit, ProcessSignal, NewProcessEvent, ProcessExecution)
from ptrace.syscall import (SYSCALL_NAMES, SYSCALL_PROTOTYPES,
FILENAME_ARGUMENTS, SOCKET_SYSCALL_NAMES)
from ptrace.func_call import FunctionCallOptions
from sys import stderr, exit
from optparse import OptionParser
from logging import getLogger, error
from ptrace.error import PTRACE_ERRORS, writeError
from ptrace.ctypes_tools import formatAddress
from ptrace.tools import signal_to_exitcode
import sys
import re
class SyscallTracer(Application):
def __init__(self):
Application.__init__(self)
# Parse self.options
self.parseOptions()
# Setup output (log)
self.setupLog()
def setupLog(self):
if self.options.output:
fd = open(self.options.output, 'w')
self._output = fd
else:
fd = stderr
self._output = None
self._setupLog(fd)
def parseOptions(self):
parser = OptionParser(
usage="%prog [options] -- program [arg1 arg2 ...]")
self.createCommonOptions(parser)
parser.add_option("--enter", help="Show system call enter and exit",
action="store_true", default=False)
parser.add_option("--profiler", help="Use profiler",
action="store_true", default=False)
parser.add_option("--type", help="Display arguments type and result type (default: no)",
action="store_true", default=False)
parser.add_option("--name", help="Display argument name (default: no)",
action="store_true", default=False)
parser.add_option("--string-length", "-s", help="String max length (default: 300)",
type="int", default=300)
parser.add_option("--array-count", help="Maximum number of array items (default: 20)",
type="int", default=20)
parser.add_option("--raw-socketcall", help="Raw socketcall form",
action="store_true", default=False)
parser.add_option("--output", "-o", help="Write output to specified log file",
type="str")
parser.add_option("--ignore-regex", help="Regex used to filter syscall names (e.g. --ignore='^(gettimeofday|futex|f?stat)')",
type="str")
parser.add_option("--address", help="Display structure address",
action="store_true", default=False)
parser.add_option("--syscalls", '-e', help="Comma separated list of shown system calls (other will be skipped)",
type="str", default=None)
parser.add_option("--socket", help="Show only socket functions",
action="store_true", default=False)
parser.add_option("--filename", help="Show only syscall using filename",
action="store_true", default=False)
parser.add_option("--show-pid",
help="Prefix line with process identifier",
action="store_true", default=False)
parser.add_option("--list-syscalls",
help="Display system calls and exit",
action="store_true", default=False)
parser.add_option("-i", "--show-ip",
help="print instruction pointer at time of syscall",
action="store_true", default=False)
self.createLogOptions(parser)
self.options, self.program = parser.parse_args()
if self.options.list_syscalls:
syscalls = list(SYSCALL_NAMES.items())
syscalls.sort(key=lambda data: data[0])
for num, name in syscalls:
print("% 3s: %s" % (num, name))
exit(0)
if self.options.pid is None and not self.program:
parser.print_help()
exit(1)
# Create "only" filter
only = set()
if self.options.syscalls:
# split by "," and remove spaces
for item in self.options.syscalls.split(","):
item = item.strip()
if not item or item in only:
continue
ok = True
valid_names = list(SYSCALL_NAMES.values())
for name in only:
if name not in valid_names:
print("ERROR: unknown syscall %r" % name, file=stderr)
ok = False
if not ok:
print(file=stderr)
print(
"Use --list-syscalls options to get system calls list", file=stderr)
exit(1)
# remove duplicates
only.add(item)
if self.options.filename:
for syscall, format in SYSCALL_PROTOTYPES.items():
restype, arguments = format
if any(argname in FILENAME_ARGUMENTS for argtype, argname in arguments):
only.add(syscall)
if self.options.socket:
only |= SOCKET_SYSCALL_NAMES
self.only = only
if self.options.ignore_regex:
try:
self.ignore_regex = re.compile(self.options.ignore_regex)
except Exception as err:
print("Invalid regular expression! %s" % err)
print("(regex: %r)" % self.options.ignore_regex)
exit(1)
else:
self.ignore_regex = None
if self.options.fork:
self.options.show_pid = True
self.processOptions()
def ignoreSyscall(self, syscall):
name = syscall.name
if self.only and (name not in self.only):
return True
if self.ignore_regex and self.ignore_regex.match(name):
return True
return False
def displaySyscall(self, syscall):
text = syscall.format()
if syscall.result is not None:
text = "%-40s = %s" % (text, syscall.result_text)
prefix = []
if self.options.show_pid:
prefix.append("[%s]" % syscall.process.pid)
if self.options.show_ip:
prefix.append("[%s]" % formatAddress(syscall.instr_pointer))
if prefix:
text = ''.join(prefix) + ' ' + text
error(text)
def syscallTrace(self, process):
# First query to break at next syscall
self.prepareProcess(process)
exitcode = 0
while True:
# No more process? Exit
if not self.debugger:
break
# Wait until next syscall enter
try:
event = self.debugger.waitSyscall()
except ProcessExit as event:
self.processExited(event)
if event.exitcode is not None:
exitcode = event.exitcode
continue
except ProcessSignal as event:
event.display()
event.process.syscall(event.signum)
exitcode = signal_to_exitcode(event.signum)
continue
except NewProcessEvent as event:
self.newProcess(event)
continue
except ProcessExecution as event:
self.processExecution(event)
continue
# Process syscall enter or exit
self.syscall(event.process)
return exitcode
def syscall(self, process):
state = process.syscall_state
syscall = state.event(self.syscall_options)
if syscall and (syscall.result is not None or self.options.enter):
self.displaySyscall(syscall)
# Break at next syscall
process.syscall()
def processExited(self, event):
# Display syscall which has not exited
state = event.process.syscall_state
if (state.next_event == "exit") \
and (not self.options.enter) \
and state.syscall:
self.displaySyscall(state.syscall)
# Display exit message
error("*** %s ***" % event)
def prepareProcess(self, process):
process.syscall()
process.syscall_state.ignore_callback = self.ignoreSyscall
def newProcess(self, event):
process = event.process
error("*** New process %s ***" % process.pid)
self.prepareProcess(process)
process.parent.syscall()
def processExecution(self, event):
process = event.process
error("*** Process %s execution ***" % process.pid)
process.syscall()
def runDebugger(self):
# Create debugger and traced process
self.setupDebugger()
process = self.createProcess()
if not process:
return
self.syscall_options = FunctionCallOptions(
write_types=self.options.type,
write_argname=self.options.name,
string_max_length=self.options.string_length,
replace_socketcall=not self.options.raw_socketcall,
write_address=self.options.address,
max_array_count=self.options.array_count,
)
self.syscall_options.instr_pointer = self.options.show_ip
return self.syscallTrace(process)
def main(self):
if self.options.profiler:
from ptrace.profiler import runProfiler
exitcode = runProfiler(getLogger(), self._main)
else:
exitcode = self._main()
if self._output is not None:
self._output.close()
sys.exit(exitcode)
def _main(self):
self.debugger = PtraceDebugger()
exitcode = 0
try:
exitcode = self.runDebugger()
except ProcessExit as event:
self.processExited(event)
if event.exitcode is not None:
exitcode = event.exitcode
except PtraceError as err:
error("ptrace() error: %s" % err)
if err.errno is not None:
exitcode = err.errno
except KeyboardInterrupt:
error("Interrupted.")
exitcode = 1
except PTRACE_ERRORS as err:
writeError(getLogger(), err, "Debugger error")
exitcode = 1
self.debugger.quit()
return exitcode
def createChild(self, program):
pid = Application.createChild(self, program)
error("execve(%s, %s, [/* 40 vars */]) = %s" % (
program[0], program, pid))
return pid
if __name__ == "__main__":
SyscallTracer().main()
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