pb ssl + select

[Ktm]

Hi,

the following code (just taken on the example) blocks on recv unless I
uncomment the 'send' function. I tested it with stunnel. Select seems to
tell that there is something to read whereas there is nothing. Moreover
why does it block since I am in non blocking mode ?


-----

from OpenSSL import SSL
import sys, os, select, socket


def verify_cb(conn, cert, errnum, depth, ok):
# This obviously has to be updated
print 'Got certificate: %s' % cert.get_subjec t()
return ok

if len(sys.argv) < 2:
print 'Usage: python[2] server.py PORT'
sys.exit(1)

dir = os.path.dirname (sys.argv[0])
if dir == '':
dir = os.curdir

# Initialize context
ctx = SSL.Context(SSL .SSLv23_METHOD)
ctx.set_options (SSL.OP_NO_SSLv 2)
ctx.set_verify( SSL.VERIFY_NONE , verify_cb) # Demand a certificate
ctx.use_private key_file (os.path.join(d ir, 'cert/server.pkey'))
ctx.use_certifi cate_file(os.pa th.join(dir, 'cert/server.cert'))
ctx.load_verify _locations(os.p ath.join(dir, 'cert/CA.cert'))

# Set up server
server = SSL.Connection( ctx, socket.socket(s ocket.AF_INET,
socket.SOCK_STR EAM))
server.bind(('' , int(sys.argv[1])))
server.listen(3 )
server.setblock ing(0)

clients = {}
writers = {}

def dropClient(cli, errors=None):
if errors:
print 'Client %s left unexpectedly:' % (clients[cli],)
print ' ', errors
else:
print 'Client %s left politely' % (clients[cli],)
del clients[cli]
if writers.has_key (cli):
del writers[cli]
if not errors:
cli.shutdown()
cli.close()
__cli = None
while 1:
print 'select'
try:
r,w,_ = select.select([server]+clients.keys() , writers.keys(),
[], 1) except:
break
print '[ OK ]'
for cli in r:
if cli == server:
cli,addr = server.accept()
__cli = cli
print 'Connection from %s' % (addr,)
clients[cli] = addr

else:
try:
print 'recv...'
######## we block here ###########
ret = cli.recv(1024)
print '[ OK ]'
except (SSL.WantReadEr ror, SSL.WantWriteEr ror,
SSL.WantX509Loo kupError):
pass
except SSL.ZeroReturnE rror:
dropClient(cli)
except SSL.Error, errors:
dropClient(cli, errors)
else:
if not writers.has_key (cli):
writers[cli] = ''
writers[cli] = writers[cli] + ret
# if we decomment this it is ok
###if __cli:
###print 'send'
###__cli.send(' test\n') ###print '[ OK ]'
for cli in w:
try:
ret = cli.send(writer s[cli])
except (SSL.WantReadEr ror, SSL.WantWriteEr ror,
SSL.WantX509Loo kupError):
pass
except SSL.ZeroReturnE rror:
dropClient(cli)
except SSL.Error, errors:
dropClient(cli, errors)
else:
writers[cli] = writers[cli][ret:]
if writers[cli] == '':
del writers[cli]

for cli in clients.keys():
cli.close()
server.close()