This file is indexed.

/usr/share/pyshared/Pyro/protocol.py is in pyro 1:3.14-1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
#############################################################################
#
#	Pyro Protocol Adapters
#
#	This is part of "Pyro" - Python Remote Objects
#	which is (c) Irmen de Jong - irmen@razorvine.net
#
#############################################################################

from __future__ import with_statement
import socket, struct, os, time, sys, hmac, types, random, errno, select
import imp, marshal, new, __builtin__
try:
	import hashlib
	md5=hashlib.md5
except ImportError:
	import md5
	md5=md5.md5
import Pyro.constants, Pyro.util

from Pyro.errors import *
from Pyro.errors import _InternalNoModuleError
pickle = Pyro.util.getPickle()
Log = Pyro.util.Log
	
if Pyro.util.supports_multithreading():
	from threading import Thread,currentThread
	_has_threading = 1
else:
	_has_threading = 0

if Pyro.util.supports_compression():
	import zlib
	_has_compression = 1
else:
	_has_compression = 0


try:
	from M2Crypto import SSL
	from M2Crypto.SSL import SSLError
	if _has_threading:
		import M2Crypto
		M2Crypto.threading.init()
except ImportError:
	class SSLError(Exception): pass

#------ Get the hostname (possibly of other machines) (returns None on error)
def getHostname(ip=None):
	try:
		if ip:
			(hn,alias,ips) = socket.gethostbyaddr(ip)
			return hn
		else:
			return socket.gethostname()
	except socket.error:
		return None

#------ Get IP address (return None on error)
def getIPAddress(host=None):
	try:
		return socket.gethostbyname(host or getHostname())
	except socket.error:
		return None

	
#------ Socket helper functions for sending and receiving data correctly.


# process optional timeout on socket.
# notice the check for M2Crypto SSL sockets: if there's data pending,
# a select on them will fail. So we avoid calling select in that case.
def _sock_timeout_send(sock, timeout):
	if timeout and (not hasattr(sock,'pending') or sock.pending()==0):
		r,w,e=safe_select([],[sock],[],timeout)
		if not w:
			raise TimeoutError('connection timeout sending')

def _sock_timeout_recv(sock, timeout):
	if timeout and (not hasattr(sock,'pending') or sock.pending()==0):
		r,w,e=safe_select([sock],[],[],timeout)
		if not r:
			raise TimeoutError('connection timeout receiving')

# Receive a precise number of bytes from a socket. Raises the
# ConnectionClosedError if  that number of bytes was not available.
# (the connection has probably been closed then).
# Never will this function return an empty message (if size>0).
# We need this because 'recv' isn't guaranteed to return all desired
# bytes in one call, for instance, when network load is high.
# Use a list of all chunks and join at the end: faster!
# Handle EINTR states (interrupted system call) by just retrying.
def sock_recvmsg(sock, size, timeout=0):
	while True:
		try:
			return _recv_msg(sock,size,timeout)
		except socket.timeout:
			raise TimeoutError("connection timeout receiving")
		except socket.error,x:
			if x.args[0] == errno.EINTR or (hasattr(errno, 'WSAEINTR') and x.args[0] == errno.WSAEINTR):
				# interrupted system call, just retry
				continue
			raise ConnectionClosedError('connection lost: %s' % x)
		except SSLError,x:
			raise ConnectionClosedError('connection lost: %s' % x)

# select the optimal recv() implementation
if hasattr(socket,"MSG_WAITALL") and not Pyro.config.PYRO_BROKEN_MSGWAITALL:
	def _recv_msg(sock,size,timeout):
		_sock_timeout_recv(sock,timeout)
		try:		
			chunk=sock.recv(size, socket.MSG_WAITALL)   # receive all data in one call
		except TypeError:
			# M2Crypto sock.recv() doesn't support MSG_WAITALL parameter
			return __recv_msg_compat(sock,size,timeout)
		else:
			if len(chunk)!=size:
				err=ConnectionClosedError('connection lost')
				err.partialMsg=chunk  # store the message that was received until now
				raise err
			return chunk
else:
	def _recv_msg(sock,size,timeout):
		_sock_timeout_recv(sock, timeout)
		return __recv_msg_compat(sock,size,timeout)

def __recv_msg_compat(sock,size,timeout):   # compatibility implementation for non-MSG_WAITALL / M2Crypto
	msglen=0
	msglist=[]
	# Receive chunks of max. 60kb size:
	# (rather arbitrary limit, but it avoids memory/buffer problems on certain OSes -- VAX/VMS, Windows)
	while msglen<size:
		chunk=sock.recv(min(60000,size-msglen))
		if not chunk:
			if hasattr(sock,'pending'):
				# m2crypto ssl socket - they have problems with a defaulttimeout
				if socket.getdefaulttimeout() != None:
					raise ConnectionClosedError("m2crypto SSL can't be used when socket.setdefaulttimeout() has been set")
			err = ConnectionClosedError('connection lost')
			err.partialMsg=''.join(msglist)    # store the message that was received until now
			raise err
		msglist.append(chunk)
		msglen+=len(chunk)
	return ''.join(msglist)


# Send a message over a socket. Raises ConnectionClosedError if the msg
# couldn't be sent (the connection has probably been lost then).
# We need this because 'send' isn't guaranteed to send all desired
# bytes in one call, for instance, when network load is high.

def sock_sendmsg(sock,msg,timeout=0):
	try:
		_sock_timeout_send(sock,timeout)
		sock.sendall(msg)
	except socket.error:
		raise ConnectionClosedError('connection lost')


# set socket option to try to re-use a server port if possible
def set_reuse_addr(sock):
	if os.name not in ('nt','dos','ce') and sys.platform!='cygwin':
		# only do this on a non-windows platform. Windows screws things up with REUSEADDR...
		try:
			sock.setsockopt ( socket.SOL_SOCKET, socket.SO_REUSEADDR,
				sock.getsockopt (socket.SOL_SOCKET, socket.SO_REUSEADDR) | 1)
		except:
			pass

# set socket option to enable timeout checking for server sockets.
def set_sock_keepalive(sock):
	if Pyro.config.PYRO_SOCK_KEEPALIVE:
		try:
			sock.setsockopt ( socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1 )
		except:
			Pyro.config.PYRO_SOCK_KEEPALIVE=0    # it didn't work--disable keepalives.

# set socket to not inherit in subprocess
try:
	import fcntl
	def set_sock_no_inherit(sock):
		# Mark the given socket fd as non-inheritable (posix)
		fd = sock.fileno() 
		flags = fcntl.fcntl(fd, fcntl.F_GETFD) 
		fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
except ImportError:
	# no fcntl available, try the windows version
	try: 
		from ctypes import windll, WinError 
		def set_sock_no_inherit(sock): 
			# mark the given socket fd as non-inheritable (Windows).
			if not windll.kernel32.SetHandleInformation(sock.fileno(), 1, 0): 
				raise WinError() 	
	except ImportError:
		# nothing available, define a dummy function
		def set_sock_no_inherit(sock):
			pass

#------ PYRO: adapter (default Pyro wire protocol)
#------ This adapter is for protocol version 4 ONLY
# Future adapters could be downwards compatible and more flexible.

PFLG_COMPRESSED = 0x01		# protocol flag: compressed body
PFLG_CHECKSUM =   0x02		# protocol flag: checksum body
PFLG_XMLPICKLE_GNOSIS =  0x04		# protocol flag: used xml pickling (Gnosis)


class PYROAdapter(object):
	headerFmt = '!4sHHlHl'	# header (id, ver, hsiz,bsiz,pflags,crc)
	headerID = 'PYRO'
	connectMSG='CONNECT'
	acceptMSG= 'GRANTED'
	denyMSG=   'DENIED'	# must be same length as acceptMSG,
						# note that a 1-character code is appended!

	AUTH_CHALLENGE_SIZE = 16

	headerSize = struct.calcsize(headerFmt)
	version=5				# version 5 protocol
	def __init__(self):
		self.onewayMethods=[]		# methods that should be called one-way
		self.timeout=None			# socket timeout
		self.ident=''				# connection identification
		self.setNewConnectionValidator(DefaultConnValidator())
		self.__getLockObjects()
	def sendAccept(self, conn):		# called by TCPServer
		sock_sendmsg(conn.sock, self.acceptMSG, self.timeout)
	def sendDeny(self, conn, reasonCode=Pyro.constants.DENIED_UNSPECIFIED):	# called by TCPServer
		sock_sendmsg(conn.sock, self.denyMSG+str(reasonCode)[0], self.timeout)
	def __del__(self):
		self.release(nolog=1)
	def __getstate__(self):
		# need to tweak the pickle because lock objects and conn objects can't be pickled
		self.release()   # cannot pickle the active connection so just release it
		d=self.__dict__.copy()
		del d["lock"]
		return d
	def __setstate__(self, state):
		# restore the pickle state and recreate the unpickleable lock objects
		self.__dict__.update(state)
		self.__getLockObjects()
	def __getLockObjects(self):
		self.lock=Pyro.util.getLockObject()
	def recvAuthChallenge(self, conn):
		ver,body,pflags = self.receiveMsg(conn)
		if ver==self.version and len(body)==self.AUTH_CHALLENGE_SIZE:
			return body
		raise ValueError("Received version must be "+`self.version`+" and auth challenge must be exactly "+`self.AUTH_CHALLENGE_SIZE`+" bytes")
	def setNewConnectionValidator(self,validator):
		if not isinstance(validator, DefaultConnValidator):
			raise TypeError("validator must be specialization of DefaultConnValidator")
		self.newConnValidator=validator
	def getNewConnectionValidator(self):
		return self.newConnValidator
	def bindToURI(self,URI):
		# Client-side connection stuff. Use auth code from our own connValidator.
		if URI.protocol not in ('PYRO', 'PYROLOC'):
			Log.error('PYROAdapter','incompatible protocol in URI:',URI.protocol)
			raise ProtocolError('incompatible protocol in URI')
		with self.lock:   # only 1 thread at a time can bind the URI
			try:
				self.URI=URI
				sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
				sock.connect((URI.address, URI.port))
				conn=TCPConnection(sock,sock.getpeername())
				# receive the authentication challenge string, and use that to build the actual identification string.
				try:
					authChallenge=self.recvAuthChallenge(conn)
				except ProtocolError,x:
					# check if we were denied
					if hasattr(x,"partialMsg") and x.partialMsg[:len(self.denyMSG)]==self.denyMSG:
						raise ConnectionDeniedError(Pyro.constants.deniedReasons[int(x.partialMsg[-1])])
					else:
						raise
				# reply with our ident token, generated from the ident passphrase and the challenge
				msg = self._sendConnect(sock,self.newConnValidator.createAuthToken(self.ident, authChallenge, conn.addr, self.URI, None) )
				if msg==self.acceptMSG:
					self.conn=conn
					self.conn.connected=1
					Log.msg('PYROAdapter','connected to',str(URI))
					if URI.protocol=='PYROLOC':
						self.resolvePYROLOC_URI("PYRO") # updates self.URI
				elif msg[:len(self.denyMSG)]==self.denyMSG:
					try:
						raise ConnectionDeniedError(Pyro.constants.deniedReasons[int(msg[-1])])
					except (KeyError,ValueError):
						raise ConnectionDeniedError('invalid response')
			except socket.error:
				Log.msg('PYROAdapter','connection failed to URI',str(URI))
				raise ProtocolError('connection failed')

	def resolvePYROLOC_URI(self, newProtocol):
		# This method looks up the object URI referenced by
		# the PYROLOC string, and updates self.URI in place!
		objectName=self.URI.objectID
		Log.msg('PYROAdapter','resolving PYROLOC name: ',objectName)
		# call the special Resolve method on the daemon itself:
		self.URI.objectID=Pyro.constants.INTERNAL_DAEMON_GUID
		result=self._remoteInvocation('ResolvePYROLOC',0,objectName)
		# found it, switching to regular pyro protocol
		self.URI.objectID=result
		self.URI.protocol=newProtocol

	def _sendConnect(self, sock, ident):
		body=self.connectMSG+ident
		sock_sendmsg(sock, self.createMsg(body), self.timeout)
		return sock_recvmsg(sock, len(self.acceptMSG),self.timeout)

	def release(self,nolog=0):
		if hasattr(self,'conn'):
			if not nolog:
				Log.msg('PYROAdapter','releasing connection')
			self.conn.close()
			del self.conn

	def connected(self):
		if hasattr(self,'conn'):
			return self.conn.connected
		return 0	

	def rebindURI(self, tries=sys.maxint, wait=1):
		t=0
		while t<tries:
			try:
				self.bindToURI(self.URI)
				return
			except ProtocolError:
				t+=1
				if t<tries:
					time.sleep(wait)
		raise TimeoutError('connection lost')
		
	def createMsg(self, body, replyflags=0):
		pflgs=replyflags
		if _has_compression and Pyro.config.PYRO_COMPRESSION:
			before=len(body)
			bz=zlib.compress(body) # default compression level
			if len(bz)<before:
				pflgs|=PFLG_COMPRESSED
				body=bz
		crc=0
		if Pyro.config.PYRO_CHECKSUM and _has_compression:
			crc=zlib.adler32(body)
			pflgs|=PFLG_CHECKSUM
		if Pyro.config.PYRO_XML_PICKLE=='gnosis':
			pflgs|=PFLG_XMLPICKLE_GNOSIS
		return struct.pack(self.headerFmt, self.headerID, self.version, self.headerSize, len(body), pflgs, crc) + body

	def setOneway(self, methods):
		self.onewayMethods.extend(methods)
	def setTimeout(self, timeout):
		if os.name=='java':
			# don't allow the use of the timeout feature in jython because it causes unreliable behavior
			raise RuntimeError("using setTimeout causes unreliable behavior in Jython")
		self.timeout=timeout
	def setIdentification(self, ident, munge=True):
		if ident:
			if munge:
				self.ident=self.newConnValidator.mungeIdent(ident)   # don't store ident itself. 
			else:
				self.ident=ident # per-munged ident string
		else:
			self.ident=''
	def getIdentification(self):
		return self.ident

	# Retrieve code from the remote peer. Works recursively.
	def _retrieveCode(self, mname, level):
		Log.msg("PYROAdapter","client cannot find module: "+mname)
		# XXX this is nasty code, and also duplicated in core.py remote_supply_code()
		if mname in sys.modules:
			# module is already loaded, do nothing
			# XXX how can we be sure if the module is "complete"?
			# XXX because things might go wrong during the loading code below?
			return
		try:
			# Called by the client-side to obtain code from the server-side.
			# Call the special method on the server to retrieve the code.
			# No need for complex exception stuff like when the server needs
			# code from the client (see handleInvocation): because the server
			# is a Pyro object we can actually *call* it :-)
			module = self._remoteInvocationMobileCode("remote_retrieve_code",0,mname)
			imp.acquire_lock()  # obtain the global import lock
			mname = mname.split('.')
			path = ''
			mod = new.module("pyro-server-context")
			for m in mname:
				path += '.' + m
				# use already loaded modules instead of overwriting them
				real_path = path[1:]
				if sys.modules.has_key(real_path):
					mod = sys.modules[real_path]
				else:
					setattr(mod, m, new.module(real_path))
					mod = getattr(mod, m)
					sys.modules[real_path] = mod

			Log.msg('PYROAdapter','loading supplied code: ',mname)
			if module[0:4] != imp.get_magic():
				code = compile(module, "<downloaded>", "exec")
			else:
				code = marshal.loads(module[8:])
	 
			importer=None
			try:
				loaded = 0
				# XXX probably want maxtries here...
				while not loaded:
					# install a custom importer to intercept any extra needed modules
					# when executing the module code just obtained from the server
					imp.acquire_lock()
					importer = agent_import(__builtin__.__import__)
					__builtin__.__import__ = importer
					imp.release_lock()
	 
					try:
						exec code in mod.__dict__
						loaded = 1
					except ImportError:
						mname = importer.name
						if importer is not None:
							__builtin__.__import__ = importer.orig_import
							importer = None
	 
						# XXX probably want maxrecursion here...
						self._retrieveCode(mname, level+1)
	 
			finally:
				if importer is not None:
					__builtin__.__import__ = importer.orig_import
		finally:
			imp.release_lock() # release the global import lock


	def _remoteInvocationMobileCode(self, method, flags, *args):
		# special trimmed-down version for mobile code methods (no locking etc)
		body=pickle.dumps((self.URI.objectID,method,flags,args),Pyro.config.PYRO_PICKLE_FORMAT)
		sock_sendmsg(self.conn.sock, self.createMsg(body), self.timeout)
		ver,answer,pflags = self.receiveMsg(self.conn,1)
		if answer is None:
			raise ProtocolError('incorrect answer received')
		answer=pickle.loads(answer)
		if isinstance(answer,PyroExceptionCapsule):
			if isinstance(answer.excObj,_InternalNoModuleError):
				# server couldn't load module, supply it
				return self.processMissingModuleError(answer.excObj, method, flags, args)
			else:
				# we have an encapsulated exception, raise it again.
				answer.raiseEx()
		return answer

	def remoteInvocation(self, method, flags, *args):
		with self.lock:
			# only 1 thread at a time may use this connection to call a remote method
			try:
				self.__pyrocallbusy=True
				return self._remoteInvocation(method, flags, *args)
				self.__pyrocallbusy=False
			finally:
				if self.__pyrocallbusy:
					# the call has been aborted before completion, close the connection
					# to avoid corrupt transfers on the next call
					self.release()

	def _remoteInvocation(self, method, flags, *args):
		if 'conn' not in self.__dict__.keys():
			Log.error('PYROAdapter','no connection available in remoteinvocation')
			raise ProtocolError('no connection available in remoteinvocation')
		if method in self.onewayMethods:
			flags |= Pyro.constants.RIF_Oneway
		body=pickle.dumps((self.URI.objectID,method,flags,args),Pyro.config.PYRO_PICKLE_FORMAT)
		try:
			sock_sendmsg(self.conn.sock, self.createMsg(body), self.timeout)
		except (socket.error, ProtocolError, KeyboardInterrupt):
			# Communication error during write. To avoid corrupt transfers, we close the connection.
			# Otherwise we might receive the previous reply as a result of a new methodcall! 
			# Special case for keyboardinterrupt: people pressing ^C to abort the client
			# may be catching the keyboardinterrupt in their code. We should probably be on the
			# safe side and release the proxy connection in this case too, because they might
			# be reusing the proxy object after catching the exception...
			self.release()
			raise
		else:
			if flags & Pyro.constants.RIF_Oneway:
				self.__pyrocallbusy=False
				return None		# no answer required, return immediately
			ver,answer,pflags = self.receiveMsg(self.conn,1)  # read the server's response, send no further replies
			self.__pyrocallbusy=False
			if answer is None:
				raise ProtocolError('incorrect answer received')
	
			# Try to get the answer from the server.
			# If there are import problems, try to get those modules from
			# the server too (if mobile code is enabled).
			if not Pyro.config.PYRO_MOBILE_CODE:
				answer = pickle.loads(answer)
			else:
				importer=None
				try:
					imp.acquire_lock()
					loaded = 0
					# XXX maxtries here...
					while not loaded:
						# install a custom importer to intercept any extra needed modules
						# when unpickling the answer just obtained from the server
						imp.acquire_lock()
						importer = agent_import(__builtin__.__import__)
						__builtin__.__import__ = importer
						imp.release_lock()
	 
						try:
							answer = pickle.loads(answer)
							loaded = 1
						except ImportError:
							mname = importer.name
							if importer is not None:
								__builtin__.__import__ = importer.orig_import
								importer = None
								self._retrieveCode(mname, 0)
	 
				finally:
					if importer is not None:
						__builtin__.__import__ = importer.orig_import
					imp.release_lock()
	
			if isinstance(answer,PyroExceptionCapsule):
				if isinstance(answer.excObj,_InternalNoModuleError):
					# server couldn't load the module, send it
					return self.processMissingModuleError(answer.excObj, method, flags, args)
				else:
					# we have an encapsulated exception, raise it again.
					answer.raiseEx()
			return answer

	def processMissingModuleError(self, errorinfo, method, flags, args):
		# server couldn't load module, supply it
		# XXX this code is ugly. and duplicated in remote_retrieve_code in core.py
		Log.msg('PYROAdapter',"server can't load module: "+errorinfo.modulename)
		try:
			importmodule=new.module('-agent-import-')
			mname=errorinfo.modulename
			# not used: fromlist=errorinfo.fromlist
			try:
				exec 'import '+mname in importmodule.__dict__
			except ImportError:
				Log.error('PYROAdapter','Server wanted a non-existing module:',mname)
				raise PyroError('Server wanted a non-existing module',mname)
			m=eval('importmodule.'+mname)
			bytecode=None
			if hasattr(m,"_PYRO_bytecode"):
				# use the bytecode that was put there earlier,
				# this avoids recompiles of the source .py if we don't have .pyc bytecode available
				bytecode=m._PYRO_bytecode
			else:
				# try to load the module's compiled source, or the real .py source if that fails.
				# note that the source code (.py) is opened with universal newline mode
				if not hasattr(m,"__file__"):
					raise PyroError("cannot read module source code",mname)
				(filebase,ext)=os.path.splitext(m.__file__)
				if ext.startswith(".PY"):
					exts = ( (".PYO","rb"), (".PYC","rb"), (".PY","rU") )	# uppercase
				else:
					exts = ( (".pyo","rb"), (".pyc","rb"), (".py","rU") )	# lowercase
				for ext,mode in exts:
					try:
						bytecode=open(filebase+ext, mode).read()
						break
					except EnvironmentError:
						pass
			if bytecode:
				Log.msg('PYROAdapter',"sending module to server: "+mname)
				self._remoteInvocationMobileCode("remote_supply_code",0,mname, bytecode, self.conn.sock.getsockname())
				# retry the method invocation
				return self._remoteInvocation(* (method, flags)+args)   # use the non-locking call
			Log.error("PYROAdapter","cannot read module source code for module:", mname)
			raise PyroError("cannot read module source code",mname)
		finally:
			del importmodule
		
	# (private) receives a socket message, returns: (protocolver, message, protocolflags)
	def receiveMsg(self,conn,noReply=0):
		try:
			msg=sock_recvmsg(conn.sock, self.headerSize, self.timeout)
			(hid, ver, hsiz, bsiz, pflags, crc) = struct.unpack(self.headerFmt,msg)
			# store in the connection what pickle method this is
			if pflags&PFLG_XMLPICKLE_GNOSIS:
				conn.pflags|=PFLG_XMLPICKLE_GNOSIS
			if ver!=self.version:
				msg='incompatible protocol version'
				Log.error('PYROAdapter',msg)
				if not noReply:
					# try to report error to client, but most likely the connection will terminate:
					self.returnException(conn, ProtocolError(msg))
				raise ProtocolError(msg)
			if hid!=self.headerID or hsiz!=self.headerSize:
				msg='invalid header'
				Log.error('PYROAdapter',msg)
				Log.error('PYROAdapter','INVALID HEADER DETAILS: ',conn,( hid, ver, hsiz, bsiz,pflags))
				if not noReply:
					# try to report error to client, but most likely the connection will terminate:
					self.returnException(conn, ProtocolError(msg), shutdown=1)
				raise ProtocolError(msg)
			body=sock_recvmsg(conn.sock, bsiz, self.timeout)
			if pflags&PFLG_CHECKSUM:
				if _has_compression:
					if crc!=zlib.adler32(body):
						msg='checksum error'
						Log.error('PYROAdapter',msg)
						if not noReply:
							self.returnException(conn, ProtocolError(msg))
						raise ProtocolError(msg)
				else:
					raise ProtocolError('cannot perform checksum')
			if pflags&PFLG_COMPRESSED:
				if _has_compression:
					body=zlib.decompress(body)
				else:
					# We received a compressed message but cannot decompress.
					# Is this really a server error? We now throw an exception on the server...
					raise ProtocolError('compression not supported')
			return ver,body,pflags
		except (socket.error, ProtocolError, KeyboardInterrupt),x:
			# Communication error during read. To avoid corrupt transfers, we close the connection.
			# Otherwise we might receive the previous reply as a result of a new methodcall! 
			# Special case for keyboardinterrupt: people pressing ^C to abort the client
			# may be catching the keyboardinterrupt in their code. We should probably be on the
			# safe side and release the proxy connection in this case too, because they might
			# be reusing the proxy object after catching the exception...
			self.release() 
			raise

	def _unpickleRequest(self, pflags, body):
		if pflags&PFLG_XMLPICKLE_GNOSIS:
			if Pyro.config.PYRO_XML_PICKLE=='gnosis':
				return pickle.loads(body)
			else:
				return Pyro.util.getXMLPickle('gnosis').loads(body)
		elif Pyro.config.PYRO_XML_PICKLE:
			Log.error('PYROAdapter','xml pickle required, got other pickle')
			raise ProtocolError('xml pickle required, got other pickle')
		else:
			return pickle.loads(body)

	def handleInvocation(self,daemon,conn):
		ver,body,pflags = self.receiveMsg(conn)
		if not body:
			# something went wrong even before receiving the full message body
			return
		if ver!=self.version:
			Log.error('PYROAdapter','incompatible protocol version')
			self.returnException(conn, ProtocolError('incompatible protocol version'))
			return 

		# Unpickle the request, which is a tuple:
		#  (object ID, method name, flags, (arg1,arg2,...))
		importer=fromlist=None
		try:
			if Pyro.config.PYRO_MOBILE_CODE:
				# install a custom importer to intercept any extra needed modules
				# when unpickling the request just obtained from the client
				try:
					imp.acquire_lock()
					importer=agent_import(__builtin__.__import__)
					__builtin__.__import__=importer
					req=self._unpickleRequest(pflags, body)
				finally:
					__builtin__.__import__=importer.orig_import
					imp.release_lock()
			else:
				# no mobile code; just unpickle the stuff without a custom importer.
				req=self._unpickleRequest(pflags, body)

			if type(req)!=tuple or len(req)!=4 or type(req[3])!=tuple:
				# sanity check failed
				raise ProtocolError("invalid request data format")

		except ImportError,x:
			if Pyro.config.PYRO_MOBILE_CODE:
				# return a special exception that will be processed by client;
				# it will call the internal 'remote_supply_code' member
				if importer:
					modname=importer.name
					fromlist=importer.fromlist
				else:
					modname = x.args[0][16:]
					fromlist=None
				self.returnException(conn, _InternalNoModuleError(modname,fromlist),0) # don't shutdown!
			else:
				Log.error('PYROAdapter','code problem with incoming object: '+str(x))
				self.returnException(conn, NoModuleError(* x.args))
			return

		try:
			# find the object in the implementation database of our daemon
			o=daemon.getLocalObject(req[0])
		except (KeyError, TypeError) ,x:
			Log.warn('PYROAdapter','Invocation to unknown object ignored:',x)
			self.returnException(conn, ProtocolError('unknown object ID'))
			return
		else:
			# Do the invocation. We are already running in our own thread.
			if req[2]&Pyro.constants.RIF_Oneway and Pyro.config.PYRO_ONEWAY_THREADED and daemon.threaded:
				# received a oneway call, run this in its own thread.
				thread=Thread(target=self._handleInvocation2, args=(daemon,req,pflags,conn,o,True))
				thread.setDaemon(1)   # thread must exit at program termination.
				thread.localStorage=LocalStorage()   # set local storage for the new thread
				thread.start()
			else:
				# not oneway or not in threaded mode, just do the invocation synchronously
				self._handleInvocation2(daemon,req,pflags,conn,o,False)

	def _handleInvocation2(self, daemon, req, pflags, conn, obj, mustInitTLS=False):
		if mustInitTLS:
			daemon.initTLS(daemon.getLocalStorage())
		try:
			flags=req[2]
			importer=None
			if not Pyro.config.PYRO_MOBILE_CODE:
				res = obj.Pyro_dyncall(req[1],flags,req[3])	# (method,flags,args)
			else:
				try:
					# install a custom importer to intercept any extra needed modules
					# when executing the remote method. (using the data passed in by
					# the client may trigger additional imports)
					imp.acquire_lock()
					importer=agent_import(__builtin__.__import__)
					__builtin__.__import__=importer
					res = obj.Pyro_dyncall(req[1],flags,req[3])	# (method,flags,args)
				finally:
					__builtin__.__import__=importer.orig_import
					imp.release_lock()

			if flags&Pyro.constants.RIF_Oneway:
				return		# no result, return immediately
			# reply the result to the caller
			if pflags&PFLG_XMLPICKLE_GNOSIS:
				replyflags=PFLG_XMLPICKLE_GNOSIS
				if Pyro.config.PYRO_XML_PICKLE=='gnosis':
					body=pickle.dumps(res,Pyro.config.PYRO_PICKLE_FORMAT)
				else:
					body=Pyro.util.getXMLPickle('gnosis').dumps(res,Pyro.config.PYRO_PICKLE_FORMAT)
			else:
				replyflags=0
				body=pickle.dumps(res,Pyro.config.PYRO_PICKLE_FORMAT)
			sock_sendmsg(conn.sock, self.createMsg(body,replyflags),self.timeout)
		except ImportError,ix:
			if Pyro.config.PYRO_MOBILE_CODE:
				# Return a special exception that will be processed by client;
				# it will call the internal 'remote_supply_code' member.
				# We have to use this seemingly complex way to signal the client
				# to supply us some code, but it is only a proxy! We can't *call* it!
				if importer:
					# grab the import info from our importer
					name=importer.name
					fromlist=importer.fromlist
				else:
					# XXX the importerror sometimes doesn't contain the package :-(
					name=ix.args[0][16:]
					fromlist=None
				Log.msg('PYROAdapter','failed to import',name)
				self.returnException(conn, _InternalNoModuleError(name,fromlist),0) # don't shutdown!
			else:
				Log.error('PYROAdapter','code problem with incoming object: '+str(ix))
				self.returnException(conn, NoModuleError(* ix.args))
		except Exception:
			# Handle the exception. Pass in if it was a oneway call,
			# those calls don't need any response to be sent.
			daemon.handleError(conn, bool(flags&Pyro.constants.RIF_Oneway))

	def returnException(self, conn, exc, shutdown=1, args=None):
		# return an encapsulated exception to the client
		if conn.pflags&PFLG_XMLPICKLE_GNOSIS:
			pic=Pyro.util.getXMLPickle('gnosis')
		else:
			pic=pickle
		try:
			body=pic.dumps(PyroExceptionCapsule(exc,args),Pyro.config.PYRO_PICKLE_FORMAT)
		except Exception,x:
			# hmm, pickling the exception failed... pickle the string instead
			body=pic.dumps(PyroExceptionCapsule(PyroError(str(x)),args),Pyro.config.PYRO_PICKLE_FORMAT)
		sock_sendmsg(conn.sock, self.createMsg(body),self.timeout)
		if shutdown:
			conn.close()

	def handleConnection(self, conn, tcpserver):
		# Server-side connection stuff. Use auth code from tcpserver's validator.
		try:
			# Validate the connection source (host) immediately,
			# if it's ok, send authentication challenge, and read identification data to validate. 
			(ok,reasonCode) = tcpserver.newConnValidator.acceptHost(tcpserver,conn)
			if ok:
				challenge=tcpserver.newConnValidator.createAuthChallenge(tcpserver,conn)
				if len(challenge)!=self.AUTH_CHALLENGE_SIZE:
					raise ValueError("Auth challenge must be exactly "+`self.AUTH_CHALLENGE_SIZE`+" bytes")
				sock_sendmsg(conn.sock, self.createMsg(challenge),self.timeout)
				ver,body,pflags = self.receiveMsg(conn)
				# only process the message if it makes a bit of sense
				if ver==self.version and body.startswith(self.connectMSG):
					token=body[len(self.connectMSG):]
					(ok,reasonCode) = tcpserver.newConnValidator.acceptIdentification(tcpserver,conn,token,challenge)
					if ok:
						self.sendAccept(conn)
						conn.connected=1
						return 1
					else:
						self.sendDeny(conn,reasonCode)
			else:
				self.sendDeny(conn,reasonCode)
			return 0	
		except ProtocolError:
			# ignore the message if it caused protocol errors
			return 0

# import wrapper class to help with importing remote modules
class agent_import(object):
	def __init__(self, orig_import):
		self.orig_import=orig_import
	def __call__(self,name,iglobals={},ilocals={},fromlist=None, *rest, **krest):
		if os.name=="java":
			# workaround for odd Jython bug, iglobals and ilocals may not exist in this scope...(?!)
			iglobals=vars().get("iglobals",{})
			ilocals=vars().get("ilocals",{})
		# save the import details:
		self.name=name		# note: this must be a str object
		self.fromlist=fromlist
		return self.orig_import(name,iglobals,ilocals,fromlist, *rest, **krest)

#
# The SSL adapter that handles SSL connections instead of regular sockets.
#
class PYROSSLAdapter(PYROAdapter):
	def __init__(self):
		PYROAdapter.__init__(self)
		try:
			from M2Crypto import SSL
		except ImportError:
			raise ProtocolError('SSL not available')

		self.ctx = SSL.Context('sslv23')
		if Pyro.config.PYROSSL_KEY:
			keyfile = os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_KEY)
		else:
			keyfile = None
		self.ctx.load_cert(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CERT),
				   keyfile)
		self.ctx.load_client_ca(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CA_CERT))
		self.ctx.load_verify_info(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CA_CERT))
		self.ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert,10)
		self.ctx.set_allow_unknown_ca(1)
		Log.msg('PYROSSLAdapter','SSL Context initialized')
	
	def setTimeout(self, timeout):
		PYROAdapter.setTimeout(self, timeout)
		
	def bindToURI(self,URI):
		if URI.protocol not in ('PYROSSL','PYROLOCSSL'):
			Log.error('PYROSSLAdapter','incompatible protocol in URI:',URI.protocol)
			raise ProtocolError('incompatible protocol in URI')
		with self.lock:   # only 1 thread at a time can bind the URI
			try:
				self.URI=URI
				sock = SSL.Connection(self.ctx,socket.socket(socket.AF_INET, socket.SOCK_STREAM))
				if not Pyro.config.PYROSSL_POSTCONNCHECK:
					sock.postConnectionCheck=None
				sock.connect((URI.address, URI.port))
				conn=TCPConnection(sock, sock.getpeername())
				# receive the authentication challenge string, and use that to build the actual identification string.
				authChallenge=self.recvAuthChallenge(conn)
				# reply with our ident token, generated from the ident passphrase and the challenge
				msg = self._sendConnect(sock,self.newConnValidator.createAuthToken(self.ident, authChallenge, conn.addr, self.URI, None) )
				if msg==self.acceptMSG:
					self.conn=conn
					self.conn.connected=1
					Log.msg('PYROSSLAdapter','connected to',str(URI))
					if URI.protocol=='PYROLOCSSL':
						self.resolvePYROLOC_URI("PYROSSL") # updates self.URI
				elif msg[:len(self.denyMSG)]==self.denyMSG:
					try:
						raise ConnectionDeniedError(Pyro.constants.deniedReasons[int(msg[-1])])
					except (KeyError,ValueError):
						raise ConnectionDeniedError('invalid response')
			except socket.error:
				Log.msg('PYROSSLAdapter','connection failed to URI',str(URI))
				raise ProtocolError('connection failed')

	def _sendConnect(self, sock, ident):
		return PYROAdapter._sendConnect(self, sock, ident)
	

def getProtocolAdapter(protocol):
	if protocol in ('PYRO', 'PYROLOC'):
		return PYROAdapter()
	elif protocol in ('PYROSSL', 'PYROLOCSSL'):
		return PYROSSLAdapter()
	else:
		Log.error('getProtocolAdapter','unsupported protocol:',protocol)
		raise ProtocolError('unsupported protocol')


#-------- TCPConnection object for TCPServer class
class TCPConnection(object):
	def __init__(self, sock, addr):
		self.sock = sock
		set_sock_keepalive(self.sock)   # enable tcp/ip keepalive on this socket
		self.addr = addr
		self.connected=0		# connected?	
		self.pflags=0			# protocol flags
	def __del__(self):
		self.close()
	def fileno(self):
		return self.sock.fileno()
	def close(self):
		#self.sock.makefile().flush()
		self.sock.close()
		self.connected=0
	def shutdown(self):
		#self.sock.makefile().flush()
		self.sock.shutdown(2) # no further send/receives
	def __str__(self):
		return 'TCPConnection with '+str(self.addr)+' connected='+str(self.connected)

#-------- The New Connection Validators:
#-------- DefaultConnValidator checks max number of connections & identification
#-------- and ident check is done using hmac-md5 secure hash of passphrase+challenge.
#-------- Contains client- & server-side auth code.
class DefaultConnValidator(object):
	def __init__(self):
		self.setAllowedIdentifications(None)	# default=accept all (None means all!)
	def acceptHost(self,daemon,connection):
		if len(daemon.connections)>=Pyro.config.PYRO_MAXCONNECTIONS:
			Log.msg('DefaultConnValidator','Too many open connections, closing',connection,'#conns=',len(daemon.connections))
			return (0, Pyro.constants.DENIED_SERVERTOOBUSY)
		return (1,0)
	def acceptIdentification(self, daemon, connection, token, challenge):
		if "all" in self.allowedIDs:
			return (1,0)
		for authid in self.allowedIDs[:]:
			if self.createAuthToken(authid, challenge, connection.addr, None, daemon) == token:
				return (1,0)
		Log.warn('DefaultConnValidator','connect authentication failed on conn ',connection)
		return (0,Pyro.constants.DENIED_SECURITY)
	def createAuthToken(self, authid, challenge, peeraddr, URI, daemon):
		# Called from both client and server, is used to be able to validate the token.
		# client: URI & peeraddr provided, daemon is None
		# server: URI is None, peeraddr and daemon provided.
		# Return hmac-md5 secure hash of our authentication phrase & the challenge.
		return hmac.new(challenge, authid).digest()
	def createAuthChallenge(self, tcpserver, conn):
		# Server-side only, when new connection comes in.
		# Challenge is secure hash of: server IP, process ID, timestamp, random value
		# (NOTE: MUST RETURN EXACTLY AUTH_CHALLENGE_SIZE(=16) BYTES!)
		try:
			pid=os.getpid()
		except:
			pid=id(self)	# at least jython has no getpid()
		string = '%s-%d-%.20f-%.20f' %(str(getIPAddress()), pid, time.time(), random.random())
		return md5(string).digest()
	def mungeIdent(self, ident):
		# munge the identification string into something else that's
		# not easily guessed or recognised, like the md5 hash:
		return md5(ident).digest()
	def setAllowedIdentifications(self, ids):
		if ids is not None:
			if type(ids) in (types.TupleType, types.ListType):
				self.allowedIDs=map(self.mungeIdent, ids)  # don't store ids themselves
			else:
				raise TypeError("ids must be a list")
		else:
			self.allowedIDs=["all"]  # trick: allow all incoming authentications.

	
#-------- basic SSL connection validator, a specialized default validator.
class BasicSSLValidator(DefaultConnValidator):
	def __init__(self):
		DefaultConnValidator.__init__(self)
	def acceptHost(self,daemon,connection):
		(ok,code) = DefaultConnValidator.acceptHost(self, daemon, connection)
		if ok:
			peercert=connection.sock.get_peer_cert()
			return self.checkCertificate(peercert)
		return (ok,code)
	def checkCertificate(self,cert):
		# do something interesting with the cert here, in a subclass :)
		if cert is None:
			return (0,Pyro.constants.DENIED_SECURITY)
		return (1,0)



#-------- Helper class for local storage.
class LocalStorage(object):
	def __init__(self):
		self.caller=None

#-------- TCPServer base class


class TCPServer(object):
	def __init__(self, port, host='', threaded=_has_threading,prtcol='PYRO'):
		self._ssl_server = 0
		self.connections = []  # connection threads
		self.initTLS=lambda tls: None  # default do-nothing func
		if host:
			socket.gethostbyname(host)  # validate hostname
		try:
			if prtcol=='PYROSSL':
				try:
					from M2Crypto import SSL
				except ImportError:
					raise ProtocolError('SSL not available')
				try:
					self.ctx = SSL.Context('sslv23')
					if Pyro.config.PYROSSL_KEY:
						keyfile = os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_KEY)
					else:
						keyfile = None
					self.ctx.load_cert(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CERT),
							   keyfile)
					self.ctx.load_client_ca(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CA_CERT))
					self.ctx.load_verify_info(os.path.join(Pyro.config.PYROSSL_CERTDIR, Pyro.config.PYROSSL_CA_CERT))
					self.ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert,10)
					self.ctx.set_allow_unknown_ca(1)
					self._ssl_server = 1
					Log.msg('TCPServer','SSL Context initialized')
				except:
					Log.warn('TCPServer','SSL Context could not be initialized !!!')
				self.setNewConnectionValidator(BasicSSLValidator())
			else:
				self.setNewConnectionValidator(DefaultConnValidator())
				
			# create server socket for new connections
			self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
			set_reuse_addr(self.sock)
			set_sock_no_inherit(self.sock)
			self.sock.bind((host,port))
			self.sock.listen(Pyro.config.PYRO_TCP_LISTEN_BACKLOG)
			if self._ssl_server:
				self.sock = SSL.Connection(self.ctx,self.sock)   # wrap server socket as SSL socket
			# rest of members
			self.threaded = threaded
			self.mustShutdown=0  # global shutdown
			self.localStorage=LocalStorage()  # TLS for systems that don't have threads
			return		
		except socket.error,msg:
			raise ProtocolError(msg)
		Log.msg('TCPServer','initialized')
			
	def __del__(self):
		self.closedown(nolog=1)

	def setInitTLS(self, initTLS):
		if not callable(initTLS):
			raise TypeError("initTLS must be callable object")
		self.initTLS=initTLS
		# if in single thread mode, (re-)init the TLS right away.
		if not Pyro.config.PYRO_MULTITHREADED:
			self.initTLS(self.localStorage)
		
	def closedown(self, nolog=0):
		# explicit closedown request
		if len(self.connections)>0:
			if not nolog:
				Log.warn('TCPServer','Shutting down but there are still',len(self.connections),'active connections')
			for c in self.connections[:]:
				if isinstance(c,TCPConnection):
					c.close()
				if isinstance(c,Thread):
					c.join()
			self.connections=[]
		if hasattr(self,'sock'):
			self.sock.close()
			del self.sock

	def setNewConnectionValidator(self,validator):
		if not isinstance(validator, DefaultConnValidator):
			raise TypeError("validator must be specialization of DefaultConnValidator")
		self.newConnValidator=validator
	def getNewConnectionValidator(self):
		return self.newConnValidator

	def connectionHandler(self, conn):
		# Handle the connection and all requests that arrive on it.
		# This is only called in multithreading mode.
		self.initTLS(self.getLocalStorage())
		try:
			if self.getAdapter().handleConnection(conn, self):
				Log.msg('TCPServer','new connection ',conn, ' #conns=',len(self.connections))
				while not self.mustShutdown:
					try:
						if not conn.connected:
							# connection has been closed in the meantime!
							raise ConnectionClosedError()
						self.handleInvocation(conn)
					except ConnectionClosedError:
						# client went away. Exit immediately
						self.removeConnection(conn)
						return 
					except (PyroExceptionCapsule, Exception):
						self.handleError(conn)
			else:
				# log entry has already been written by newConnValidator
				self.removeConnection(conn)
		finally:
			# exiting thread.
			self._removeFromConnectionList(None)

	def _removeFromConnectionList(self, obj):
		if self.threaded and currentThread:
			obj=currentThread()
		try:
			self.connections.remove(obj)
		except ValueError:
			pass


	# this is the preferred way of dealing with the request loop.
	def requestLoop(self, condition=lambda:1, timeout=3, others=[], callback=None):
		while condition() and not self.mustShutdown:
			self.handleRequests(timeout,others,callback)

	def handleRequests(self, timeout=None, others=[], callback=None):
		if others and not callback:
			raise ProtocolError('callback required')
		if self.threaded:
			self._handleRequest_Threaded(timeout,others,callback)
		else:
			self._handleRequest_NoThreads(timeout,others,callback)
	
	def _handleRequest_NoThreads(self,timeout,others,callback):
		# self.connections is used to keep track of TCPConnections
		socklist = self.connections+[self.sock]+others
		ins,outs,exs = safe_select(socklist,[],[],timeout)
		if self.sock in ins:
			# it was the server socket, new incoming connection
			ins.remove(self.sock)
			if self._ssl_server:
				try:
					csock, addr = self.sock.accept()
					#if not Pyro.config.PYROSSL_POSTCONNCHECK:
					#	csock.postConnectionCheck=None
				except SSL.SSLError,error:
					Log.warn('TCPServer','SSL error: '+str(error))
					return
			else:
				csock, addr = self.sock.accept()

			conn=TCPConnection(csock,addr)
			if self.getAdapter().handleConnection(conn, self):
				Log.msg('TCPServer','new connection ',conn, ' #conns=',len(self.connections))
				self.connections.append(conn)
			else:
				# connection denied, log entry has already been written by newConnValidator
				self.removeConnection(conn)

		for c in ins[0:]:
			if isinstance(c,TCPConnection):
				ins.remove(c)
				try:
					self.handleInvocation(c)
					if not c.connected:
						self.removeConnection(c)
				except ConnectionClosedError:
					# client went away.
					self.removeConnection(c)
				except:
					self.handleError(c)
				
		if ins and callback:
			# the 'others' must have fired...
			callback(ins)

	# def handleInvocation(self, conn):	.... abstract method (implemented in subclass)


	def _handleRequest_Threaded(self,timeout,others,callback):
		# self.connections is used to keep track of connection Threads
		socklist = [self.sock]+others
		ins,outs,exs = safe_select(socklist,[],[],timeout)
		if self.sock in ins:
			# it was the server socket, new incoming connection
			if self._ssl_server:
				try:
					csock, addr = self.sock.accept()
					#if not Pyro.config.PYROSSL_POSTCONNCHECK:
					#	csock.postConnectionCheck=None
				except SSL.SSLError,error:
					Log.warn('TCPServer','SSL error: '+str(error))
					return
			else:
				csock, addr = self.sock.accept()

			conn=TCPConnection(csock,addr)
			thread=Thread(target=self.connectionHandler, args=(conn,))
			thread.setDaemon(1)   # thread must exit at program termination.
			thread.localStorage=LocalStorage()
			self.connections.append(thread)
			thread.start()
		elif callback:
			# the 'others' must have fired...
			callback(ins)

	def getLocalStorage(self):
		# return storage object for this thread.
		if self.threaded:
			return currentThread().localStorage
		else:
			return self.localStorage

	# to be called if a dropped connection is detected:
	def removeConnection(self, conn):
		conn.close()
		self._removeFromConnectionList(conn)
		Log.msg('TCPServer','removed connection ',conn,' #conns=',len(self.connections))

	# to be called to stop all connections and shut down.
	def shutdown(self):
		self.mustShutdown=1

	def getAdapter(self):
		raise NotImplementedError,'must be overridden to return protocol adapter'
	def handleError(self,conn,onewaycall=False):
		raise NotImplementedError,'must be overridden'

	def getServerSockets(self):
		if self.threaded:
			return [self.sock]
		else:
			return map(lambda conn: conn.sock, self.connections)+[self.sock]

# Sometimes safe_select() raises an select.error exception with the EINTR
# errno flag set, which basically tells the caller to try again later.
# This safe_select method works around this case and indeed just tries again.
_selectfunction=select.select
if os.name=="java":
	from select import cpython_compatible_select as _selectfunction
def safe_select(r,w,e,timeout=None):
	delay=timeout
	while True:
		try:
			# Make sure we don't delay longer than requested
			start=time.time()
			if delay is not None:
				return _selectfunction(r,w,e,delay)
			else:
				return _selectfunction(r,w,e)
		except select.error,x:
			if x.args[0] == errno.EINTR or (hasattr(errno, 'WSAEINTR') and x.args[0] == errno.WSAEINTR):
				delay=max(0.0,time.time()-start)
			else:
				raise