import struct
import socket
import threading
+import traceback
import errno
import fcntl
+import random
import traceback
import functools
import collections
packet[48:] if (int(packet[1],16) > 5) else packet[40:], # payload
) ) )
-def _packetReady(buf, ether_mode=False, len=len):
+def _packetReady(buf, ether_mode=False, len=len, str=str):
if not buf:
return False
totallen = socket.htons(totallen)
rv = len(buf[0]) >= totallen
if not rv and len(buf) > 1:
- nbuf = ''.join(buf)
- buf.clear()
- buf.append(nbuf)
+ # collapse only first two buffers
+ # as needed, to mantain len(buf) meaningful
+ p1 = buf.popleft()
+ buf[0] = p1+str(buf[0])
else:
return rv
return rv
-def _pullPacket(buf, ether_mode=False, len=len):
+def _pullPacket(buf, ether_mode=False, len=len, buffer=buffer):
if ether_mode:
return buf.popleft()
else:
_,totallen = struct.unpack('HH',buf[0][:4])
totallen = socket.htons(totallen)
- if len(buf[0]) < totallen:
- rv = buf[0][:totallen]
- buf[0] = buf[0][totallen:]
+ if len(buf[0]) > totallen:
+ rv = buffer(buf[0],0,totallen)
+ buf[0] = buffer(buf[0],totallen)
else:
rv = buf.popleft()
return rv
-def etherStrip(buf):
+def etherStrip(buf, buffer=buffer, len=len):
if len(buf) < 14:
return ""
if buf[12:14] == '\x08\x10' and buf[16:18] == '\x08\x00':
# tagged ethernet frame
- return buf[18:]
+ return buffer(buf, 18)
elif buf[12:14] == '\x08\x00':
# untagged ethernet frame
- return buf[14:]
+ return buffer(buf, 14)
else:
return ""
return False
def tun_fwd(tun, remote, with_pi, ether_mode, cipher_key, udp, TERMINATE, stderr=sys.stderr, reconnect=None, rwrite=None, rread=None, tunqueue=1000, tunkqueue=1000,
- cipher='AES', accept_local=None, accept_remote=None, slowlocal=True,
- len=len, max=max, OSError=OSError, select=select.select, selecterror=select.error, os=os, socket=socket,
+ cipher='AES', accept_local=None, accept_remote=None, slowlocal=True, queueclass=None, bwlimit=None,
+ len=len, max=max, min=min, buffer=buffer, OSError=OSError, select=select.select, selecterror=select.error, os=os, socket=socket,
retrycodes=(os.errno.EWOULDBLOCK, os.errno.EAGAIN, os.errno.EINTR) ):
crypto_mode = False
+ crypter = None
+
try:
- if cipher_key:
+ if cipher_key and cipher:
import Crypto.Cipher
import hashlib
__import__('Crypto.Cipher.'+cipher)
if rread is None:
def rread(remote, maxlen, os_read=os.read):
return os_read(remote_fd, maxlen)
-
+
rnonblock = nonblock(remote)
tnonblock = nonblock(tun)
else:
return None
- # Limited frame parsing, to preserve packet boundaries.
- # Which is needed, since /dev/net/tun is unbuffered
maxbkbuf = maxfwbuf = max(10,tunqueue-tunkqueue)
tunhurry = max(0,maxbkbuf/2)
- fwbuf = collections.deque()
- bkbuf = collections.deque()
+
+ if queueclass is None:
+ queueclass = collections.deque
+ maxbatch = 2000
+ maxtbatch = 50
+ else:
+ maxfwbuf = maxbkbuf = 2000000000
+ maxbatch = 50
+ maxtbatch = 30
+ tunhurry = 30
+
+ fwbuf = queueclass()
+ bkbuf = queueclass()
nfwbuf = 0
nbkbuf = 0
- if ether_mode:
+
+ # backwards queue functions
+ # they may need packet inspection to
+ # reconstruct packet boundaries
+ if ether_mode or udp:
packetReady = bool
- pullPacket = collections.deque.popleft
- reschedule = collections.deque.appendleft
+ pullPacket = queueclass.popleft
+ reschedule = queueclass.appendleft
else:
packetReady = _packetReady
pullPacket = _pullPacket
- reschedule = collections.deque.appendleft
+ reschedule = queueclass.appendleft
+
+ # forward queue functions
+ # no packet inspection needed
+ fpacketReady = bool
+ fpullPacket = queueclass.popleft
+ freschedule = queueclass.appendleft
+
tunfd = tun.fileno()
os_read = os.read
os_write = os.write
+ tget = time.time
+ maxbwfree = bwfree = 1500 * tunqueue
+ lastbwtime = tget()
+
remoteok = True
+
while not TERMINATE:
wset = []
if packetReady(bkbuf):
wset.append(tun)
- if remoteok and packetReady(fwbuf):
+ if remoteok and fpacketReady(fwbuf) and (not bwlimit or bwfree > 0):
wset.append(remote)
rset = []
if e.args[0] == errno.EINTR:
# just retry
continue
+ else:
+ traceback.print_exc(file=sys.stderr)
+ raise
# check for errors
if errs:
# check to see if we can write
#rr = wr = rt = wt = 0
if remote in wrdy:
+ sent = 0
try:
try:
- for x in xrange(2000):
+ for x in xrange(maxbatch):
packet = pullPacket(fwbuf)
if crypto_mode:
packet = encrypt_(packet, crypter)
- rwrite(remote, packet)
+ sentnow = rwrite(remote, packet)
+ sent += sentnow
#wr += 1
- if not rnonblock or not packetReady(fwbuf):
+ if not udp and 0 <= sentnow < len(packet):
+ # packet partially sent
+ # reschedule the remaining part
+ # this doesn't happen ever in udp mode
+ freschedule(fwbuf, buffer(packet,sentnow))
+
+ if not rnonblock or not fpacketReady(fwbuf):
break
except OSError,e:
# This except handles the entire While block on PURPOSE
# The only operation that can raise this exception is rwrite
if e.errno in retrycodes:
# re-schedule packet
- reschedule(fwbuf, packet)
+ freschedule(fwbuf, packet)
else:
raise
except:
# in UDP mode, we ignore errors - packet loss man...
raise
#traceback.print_exc(file=sys.stderr)
+
+ if bwlimit:
+ bwfree -= sent
if tun in wrdy:
try:
- for x in xrange(50):
+ for x in xrange(maxtbatch):
packet = pullPacket(bkbuf)
twrite(tunfd, packet)
#wt += 1
# check incoming data packets
if tun in rdrdy:
try:
- for x in xrange(2000):
+ for x in xrange(maxbatch):
packet = tread(tunfd,2000) # tun.read blocks until it gets 2k!
if not packet:
continue
if remote in rdrdy:
try:
try:
- for x in xrange(2000):
+ for x in xrange(maxbatch):
packet = rread(remote,2000)
+
#rr += 1
if crypto_mode:
# in UDP mode, we ignore errors - packet loss man...
raise
traceback.print_exc(file=sys.stderr)
+
+ if bwlimit:
+ tnow = tget()
+ delta = tnow - lastbwtime
+ if delta > 0.001:
+ delta = int(bwlimit * delta)
+ if delta > 0:
+ bwfree = min(bwfree+delta, maxbwfree)
+ lastbwtime = tnow
#print >>sys.stderr, "rr:%d\twr:%d\trt:%d\twt:%d" % (rr,wr,rt,wt)
+def udp_connect(TERMINATE, local_addr, local_port, peer_addr, peer_port):
+ rsock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
+ retrydelay = 1.0
+ for i in xrange(30):
+ # TERMINATE is a array. An item can be added to TERMINATE, from
+ # outside this function to force termination of the loop
+ if TERMINATE:
+ raise OSError, "Killed"
+ try:
+ rsock.bind((local_addr, local_port))
+ break
+ except socket.error:
+ # wait a while, retry
+ print >>sys.stderr, "%s: Could not bind. Retrying in a sec..." % (time.strftime('%c'),)
+ time.sleep(min(30.0,retrydelay))
+ retrydelay *= 1.1
+ else:
+ rsock.bind((local_addr, local_port))
+ print >>sys.stderr, "Listening UDP at: %s:%d" % (local_addr, local_port)
+ print >>sys.stderr, "Connecting UDP to: %s:%d" % (peer_addr, peer_port)
+ rsock.connect((peer_addr, peer_port))
+ return rsock
+
+def udp_handshake(TERMINATE, rsock):
+ endme = False
+ def keepalive():
+ while not endme and not TERMINATE:
+ try:
+ rsock.send('')
+ except:
+ pass
+ time.sleep(1)
+ try:
+ rsock.send('')
+ except:
+ pass
+ keepalive_thread = threading.Thread(target=keepalive)
+ keepalive_thread.start()
+ for i in xrange(900):
+ if TERMINATE:
+ raise OSError, "Killed"
+ try:
+ heartbeat = rsock.recv(10)
+ break
+ except:
+ time.sleep(1)
+ else:
+ heartbeat = rsock.recv(10)
+ endme = True
+ keepalive_thread.join()
+
+def udp_establish(TERMINATE, local_addr, local_port, peer_addr, peer_port):
+ rsock = udp_connect(TERMINATE, local_addr, local_port, peer_addr,
+ peer_port)
+ udp_handshake(TERMINATE, rsock)
+ return rsock
+
+def tcp_connect(TERMINATE, stop, rsock, peer_addr, peer_port):
+ sock = None
+ retrydelay = 1.0
+ # The peer has a firewall that prevents a response to the connect, we
+ # will be forever blocked in the connect, so we put a reasonable timeout.
+ rsock.settimeout(10)
+ # We wait for
+ for i in xrange(30):
+ if stop:
+ break
+ if TERMINATE:
+ raise OSError, "Killed"
+ try:
+ rsock.connect((peer_addr, peer_port))
+ sock = rsock
+ break
+ except socket.error:
+ # wait a while, retry
+ print >>sys.stderr, "%s: Could not connect. Retrying in a sec..." % (time.strftime('%c'),)
+ time.sleep(min(30.0,retrydelay))
+ retrydelay *= 1.1
+ else:
+ rsock.connect((peer_addr, peer_port))
+ sock = rsock
+ if sock:
+ print >>sys.stderr, "tcp_connect: TCP sock connected to remote %s:%s" % (peer_addr, peer_port)
+ sock.settimeout(0)
+
+ print >>sys.stderr, "tcp_connect: disabling NAGLE"
+ sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+ return sock
+
+def tcp_listen(TERMINATE, stop, lsock, local_addr, local_port):
+ sock = None
+ retrydelay = 1.0
+ # We try to bind to the local virtual interface.
+ # It might not exist yet so we wait in a loop.
+ for i in xrange(30):
+ if stop:
+ break
+ if TERMINATE:
+ raise OSError, "Killed"
+ try:
+ lsock.bind((local_addr, local_port))
+ break
+ except socket.error:
+ # wait a while, retry
+ print >>sys.stderr, "%s: Could not bind. Retrying in a sec..." % (time.strftime('%c'),)
+ time.sleep(min(30.0,retrydelay))
+ retrydelay *= 1.1
+ else:
+ lsock.bind((local_addr, local_port))
+
+ print >>sys.stderr, "tcp_listen: TCP sock listening in local sock %s:%s" % (local_addr, local_port)
+ # Now we wait until the other side connects.
+ # The other side might not be ready yet, so we also wait in a loop for timeouts.
+ timeout = 1
+ lsock.listen(1)
+ for i in xrange(30):
+ if TERMINATE:
+ raise OSError, "Killed"
+ rlist, wlist, xlist = select.select([lsock], [], [], timeout)
+ if stop:
+ break
+ if lsock in rlist:
+ sock,raddr = lsock.accept()
+ print >>sys.stderr, "tcp_listen: TCP connection accepted in local sock %s:%s" % (local_addr, local_port)
+ break
+ timeout += 5
+ return sock
+
+def tcp_handshake(rsock, listen, hand):
+ # we are going to use a barrier algorithm to decide wich side listen.
+ # each side will "roll a dice" and send the resulting value to the other
+ # side.
+ win = False
+ rsock.settimeout(10)
+ try:
+ rsock.send(hand)
+ peer_hand = rsock.recv(1)
+ print >>sys.stderr, "tcp_handshake: hand %s, peer_hand %s" % (hand, peer_hand)
+ if hand < peer_hand:
+ if listen:
+ win = True
+ elif hand > peer_hand:
+ if not listen:
+ win = True
+ except socket.timeout:
+ pass
+ rsock.settimeout(0)
+ return win
+
+def tcp_establish(TERMINATE, local_addr, local_port, peer_addr, peer_port):
+ def listen(stop, hand, lsock, lresult):
+ win = False
+ rsock = tcp_listen(TERMINATE, stop, lsock, local_addr, local_port)
+ if rsock:
+ win = tcp_handshake(rsock, True, hand)
+ stop.append(True)
+ lresult.append((win, rsock))
+
+ def connect(stop, hand, rsock, rresult):
+ win = False
+ rsock = tcp_connect(TERMINATE, stop, rsock, peer_addr, peer_port)
+ if rsock:
+ win = tcp_handshake(rsock, False, hand)
+ stop.append(True)
+ rresult.append((win, rsock))
+
+ end = False
+ sock = None
+ for i in xrange(0, 50):
+ if end:
+ break
+ if TERMINATE:
+ raise OSError, "Killed"
+ hand = str(random.randint(1, 6))
+ stop = []
+ lresult = []
+ rresult = []
+ lsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
+ rsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
+ listen_thread = threading.Thread(target=listen, args=(stop, hand, lsock, lresult))
+ connect_thread = threading.Thread(target=connect, args=(stop, hand, rsock, rresult))
+ connect_thread.start()
+ listen_thread.start()
+ connect_thread.join()
+ listen_thread.join()
+ (lwin, lrsock) = lresult[0]
+ (rwin, rrsock) = rresult[0]
+ if not lrsock or not rrsock:
+ if not lrsock:
+ sock = rrsock
+ if not rrsock:
+ sock = lrsock
+ end = True
+ # both socket are connected
+ else:
+ if lwin:
+ sock = lrsock
+ end = True
+ elif rwin:
+ sock = rrsock
+ end = True
+
+ if not sock:
+ raise OSError, "Error: tcp_establish could not establish connection."
+ return sock
git://git.onelab.eu / nepi.git / blobdiff