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# -*- coding: latin-1 -*-
#
# Copyright (C) AB Strakt
# Copyright (C) Jean-Paul Calderone
# See LICENSE for details.
"""
Simple echo server, using nonblocking I/O
"""
from OpenSSL import SSL, crypto
import sys, os, select, socket
def verify_cb(conn, cert, errnum, depth, ok):
certsubject = crypto.X509Name(cert.get_subject())
commonname = certsubject.commonName
print(('Got certificate: ' + commonname))
return ok
if len(sys.argv) < 2:
print('Usage: python 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_SSLv2)
ctx.set_verify(SSL.VERIFY_PEER|SSL.VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb) # Demand a certificate
ctx.use_privatekey_file (os.path.join(dir, 'server.pkey'))
ctx.use_certificate_file(os.path.join(dir, 'server.cert'))
ctx.load_verify_locations(os.path.join(dir, 'CA.cert'))
# Set up server
server = SSL.Connection(ctx, socket.socket(socket.AF_INET, socket.SOCK_STREAM))
server.bind(('', int(sys.argv[1])))
server.listen(3)
server.setblocking(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 cli in writers:
del writers[cli]
if not errors:
cli.shutdown()
cli.close()
while 1:
try:
r, w, _ = select.select([server] + list(clients.keys()), list(writers.keys()), [])
except:
break
for cli in r:
if cli == server:
cli,addr = server.accept()
print('Connection from %s' % (addr,))
clients[cli] = addr
else:
try:
ret = cli.recv(1024).decode('utf-8')
except (SSL.WantReadError, SSL.WantWriteError, SSL.WantX509LookupError):
pass
except SSL.ZeroReturnError:
dropClient(cli)
except SSL.Error as errors:
dropClient(cli, errors)
else:
if cli not in writers:
writers[cli] = ''
writers[cli] = writers[cli] + ret
for cli in w:
try:
ret = cli.send(writers[cli])
except (SSL.WantReadError, SSL.WantWriteError, SSL.WantX509LookupError):
pass
except SSL.ZeroReturnError:
dropClient(cli)
except SSL.Error as 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()
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