+ ap = subprocess.Popen(
+ stdin = subprocess.DEVNULL,
+ stdout = subprocess.PIPE,
+ args = ['perl','-we',perl_script] + [str(x) for x in fds]
+ )
+ (output, dummy) = ap.communicate()
+ return output.decode('utf-8')
+
+ def donate(d, path, fds):
+ ancil = d._ancilmsg(fds)
+ d._eval_success('di.donate(%s, [ %s ])'
+ % (repr(path), ancil))
+ return len(ancil.split(','))
+
+ def mkdir(d, path):
+ d._eval_integer('di.mkdir(%s)'
+ % (repr(path)))
+
+ def _exists(d, path):
+ try:
+ os.stat(path)
+ return True
+ except OSError as oe:
+ if oe.errno != os.errno.ENOENT: raise oe
+ return False
+
+ def _sock_dir(d, target_euid):
+ run_dir = '/run/user/%d' % target_euid
+ if d._exists(run_dir):
+ return run_dir + '/fishdescriptor'
+
+ try:
+ pw = pwd.getpwuid(target_euid)
+ return pw.pw_dir + '/.fishdescriptor'
+ except KeyError:
+ pass
+
+ raise RuntimeError(
+ 'cannot find good socket path - no /run/user/UID nor pw entry for target process euid %d'
+ % target_euid
+ )
+
+ def fish(d, fds):
+ # -> list of fds in our process
+
+ euid = d._geteuid()
+ sockdir = d._sock_dir(euid)
+ d.mkdir(sockdir)
+
+ sockname = '%s/%s,%d' % (sockdir, os.uname().nodename, d.pid)
+
+ target_root = '/proc/%d/root' % d.pid
+ if not d._exists(target_root):
+ target_root = ''
+
+ our_sockname = target_root + sockname
+
+ s = None
+ s2 = None
+
+ try:
+ try: os.remove(our_sockname)
+ except FileNotFoundError: pass
+
+ s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+ s.bind(our_sockname)
+ s.listen(1)
+
+ ancil_len = d.donate(our_sockname, fds)
+ (s2, dummy) = s.accept()
+ (msg, ancil, flags, sender) = s2.recvmsg(1, ancil_len)
+
+ got_fds = None
+ unpack_fmt = '%di' % len(fds)
+
+ for clvl, ctype, cdata in ancil:
+ if clvl == socket.SOL_SOCKET and ctype == socket.SCM_RIGHTS:
+ assert(got_fds is None)
+ got_fds = struct.unpack_from(unpack_fmt, cdata)
+
+ finally:
+ if s is not None: s.close()
+ if s2 is not None: s2.close()
+
+ try: os.remove(our_sockname)
+ except FileNotFoundError: pass
+
+ return list(got_fds)