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from __future__ import print_function |
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import argparse |
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import errno |
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import json |
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import os |
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import signal |
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import socket |
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import sys |
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import time |
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from contextlib import closing |
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from contextlib import contextmanager |
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from subprocess import check_call |
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import manhole |
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from manhole import get_peercred |
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from manhole.cli import parse_signal |
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from . import actions |
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from . import stop |
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from . import trace |
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def install(**kwargs): |
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kwargs.setdefault('oneshot_on', 'URG') |
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kwargs.setdefault('connection_handler', 'exec') |
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manhole.install(**kwargs) |
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class RemoteStream(object): |
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def __init__(self, path, isatty, encoding): |
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self._sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
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self._sock.connect(path) |
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self._isatty = isatty |
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self._encoding = encoding |
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def isatty(self): |
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return self._isatty |
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def write(self, data): |
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try: |
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self._sock.send(data.encode(self._encoding)) |
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except Exception as exc: |
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print("Hunter failed to send trace output: %s. Stopping tracer." % exc, file=sys.stderr) |
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stop() |
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def flush(self): |
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pass |
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@contextmanager |
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def manhole_bootstrap(args, activation_payload, deactivation_payload): |
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activation_payload += '\nexit()\n' |
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deactivation_payload += '\nexit()\n' |
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activation_payload = activation_payload.encode('utf-8') |
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deactivation_payload = deactivation_payload.encode('utf-8') |
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with closing(connect_manhole(args.pid, args.timeout, args.signal)) as manhole: |
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manhole.send(activation_payload) |
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try: |
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yield |
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finally: |
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with closing(connect_manhole(args.pid, args.timeout, args.signal)) as manhole: |
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manhole.send(deactivation_payload) |
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@contextmanager |
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def gdb_bootstrap(args, activation_payload, deactivation_payload): |
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print('WARNING: Using GDB may deadlock the process or create unpredictable results!') |
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activation_command = [ |
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'gdb', '-p', str(args.pid), '-batch', |
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'-ex', 'call Py_AddPendingCall(PyRun_SimpleString, %s)' % json.dumps(activation_payload), |
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] |
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deactivation_command = [ |
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'gdb', '-p', str(args.pid), '-batch', |
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'-ex', 'call Py_AddPendingCall(PyRun_SimpleString, %s)' % json.dumps(deactivation_payload), |
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] |
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check_call(activation_command) |
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try: |
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yield |
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finally: |
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check_call(deactivation_command) |
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def connect_manhole(pid, timeout, signal): |
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os.kill(pid, signal) |
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start = time.time() |
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uds_path = '/tmp/manhole-%s' % pid |
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manhole = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
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manhole.settimeout(timeout) |
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while time.time() - start < timeout: |
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try: |
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manhole.connect(uds_path) |
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except Exception as exc: |
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if exc.errno not in (errno.ENOENT, errno.ECONNREFUSED): |
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print("Failed to connect to %r: %r" % (uds_path, exc), file=sys.stderr) |
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else: |
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break |
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else: |
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print("Failed to connect to %r: Timeout" % uds_path, file=sys.stderr) |
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sys.exit(5) |
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return manhole |
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106
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107
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def activate(sink_path, isatty, encoding, options): |
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stream = actions.DEFAULT_STREAM = RemoteStream(sink_path, isatty, encoding) |
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try: |
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stream.write("Output stream active. Starting tracer ...\n\n") |
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eval("trace(%s)" % options) |
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except Exception as exc: |
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stream.write("Failed to activate: %s. %s\n" % ( |
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exc, |
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'Tracer options where: %s.' % options if options else 'No tracer options.' |
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)) |
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actions.DEFAULT_STREAM = sys.stderr |
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raise |
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120
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trace # used in eval above |
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def deactivate(): |
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actions.DEFAULT_STREAM = sys.stderr |
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stop() |
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128
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129
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parser = argparse.ArgumentParser(description='Trace a process.') |
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parser.add_argument('-p', '--pid', metavar='PID', type=int, required=True, |
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help='A numerical process id.') |
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parser.add_argument('options', metavar='OPTIONS', nargs='*') |
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parser.add_argument('-t', '--timeout', dest='timeout', default=1, type=float, |
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help='Timeout to use. Default: %(default)s seconds.') |
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parser.add_argument('--gdb', dest='gdb', action='store_true', |
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help='Use GDB to activate tracing. WARNING: it may deadlock the process!') |
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parser.add_argument('-s', '--signal', dest='signal', type=parse_signal, metavar="SIGNAL", default=signal.SIGURG, |
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help='Send the given SIGNAL to the process before connecting.') |
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def main(): |
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args = parser.parse_args() |
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sink = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
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sink_path = '/tmp/hunter-%s' % os.getpid() |
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sink.bind(sink_path) |
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sink.listen(1) |
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os.chmod(sink_path, 0o777) |
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149
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150
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stdout = os.fdopen(sys.stdout.fileno(), 'wb', 0) |
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encoding = getattr(sys.stdout, 'encoding', 'utf-8') or 'utf-8' |
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bootstrapper = gdb_bootstrap if args.gdb else manhole_bootstrap |
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payload = 'from hunter import remote; remote.activate(%r, %r, %r, %r)' % ( |
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sink_path, |
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sys.stdout.isatty(), |
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encoding, |
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','.join(i.strip(',') for i in args.options) |
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) |
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with bootstrapper(args, payload, 'from hunter import remote; remote.deactivate()'): |
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conn, _ = sink.accept() |
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os.unlink(sink_path) |
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pid, _, _ = get_peercred(conn) |
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if pid != args.pid: |
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raise Exception("Unexpected pid %r connected to output socket. Was expecting %s." % (pid, args.pid)) |
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data = conn.recv(1024) |
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while data: |
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stdout.write(data) |
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data = conn.recv(1024) |
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ionelmc /
python-hunter
