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import select, socket, threading, traceback, sys
from OpenSSL import SSL
class NetLibError(Exception): pass
class FileLike:
def __init__(self, o):
self.o = o
def __getattr__(self, attr):
return getattr(self.o, attr)
def flush(self):
pass
def read(self, length):
result = ''
while length > 0:
try:
data = self.o.read(length)
except (SSL.ZeroReturnError, SSL.SysCallError):
break
if not data:
break
result += data
length -= len(data)
return result
def write(self, v):
self.o.sendall(v)
def readline(self, size = None):
result = ''
bytes_read = 0
while True:
if size is not None and bytes_read >= size:
break
ch = self.read(1)
bytes_read += 1
if not ch:
break
else:
result += ch
if ch == '\n':
break
return result
class TCPClient:
def __init__(self, host, port):
self.host, self.port = host, port
self.connection, self.rfile, self.wfile = None, None, None
self.cert = None
self.ssl_established = False
def convert_to_ssl(self, clientcert=None, sni=None):
context = SSL.Context(SSL.SSLv23_METHOD)
if clientcert:
context.use_certificate_file(self.clientcert)
self.connection = SSL.Connection(context, self.connection)
if sni:
self.connection.set_tlsext_host_name(sni)
self.connection.set_connect_state()
try:
self.connection.do_handshake()
except SSL.Error, v:
raise NetLibError("SSL handshake error: %s"%str(v))
self.cert = self.connection.get_peer_certificate()
self.rfile = FileLike(self.connection)
self.wfile = FileLike(self.connection)
self.ssl_established = True
def connect(self):
try:
addr = socket.gethostbyname(self.host)
connection = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
connection.connect((addr, self.port))
self.rfile, self.wfile = connection.makefile('rb'), connection.makefile('wb')
except socket.error, err:
raise NetLibError('Error connecting to "%s": %s' % (self.host, err))
self.connection = connection
class BaseHandler:
"""
The instantiator is expected to call the handle() and finish() methods.
"""
rbufsize = -1
wbufsize = -1
def __init__(self, connection, client_address, server):
self.connection = connection
self.rfile = self.connection.makefile('rb', self.rbufsize)
self.wfile = self.connection.makefile('wb', self.wbufsize)
self.client_address = client_address
self.server = server
self.finished = False
self.ssl_established = False
def convert_to_ssl(self, cert, key):
ctx = SSL.Context(SSL.SSLv23_METHOD)
ctx.set_tlsext_servername_callback(self.handle_sni)
ctx.use_privatekey_file(key)
ctx.use_certificate_file(cert)
self.connection = SSL.Connection(ctx, self.connection)
self.connection.set_accept_state()
# SNI callback happens during do_handshake()
try:
self.connection.do_handshake()
except SSL.Error, v:
raise NetLibError("SSL handshake error: %s"%str(v))
self.rfile = FileLike(self.connection)
self.wfile = FileLike(self.connection)
self.ssl_established = True
def finish(self):
self.finished = True
try:
if not getattr(self.wfile, "closed", False):
self.wfile.flush()
self.connection.close()
self.wfile.close()
self.rfile.close()
except IOError: # pragma: no cover
pass
def handle_sni(self, connection):
"""
Called if the client has given a server name indication.
Server name can be retrieved like this:
connection.get_servername()
And you can specify the connection keys as follows:
new_context = Context(TLSv1_METHOD)
new_context.use_privatekey(key)
new_context.use_certificate(cert)
connection.set_context(new_context)
"""
pass
def handle(self): # pragma: no cover
raise NotImplementedError
class TCPServer:
request_queue_size = 20
def __init__(self, server_address):
self.server_address = server_address
self.__is_shut_down = threading.Event()
self.__shutdown_request = False
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind(self.server_address)
self.server_address = self.socket.getsockname()
self.port = self.server_address[1]
self.socket.listen(self.request_queue_size)
def request_thread(self, request, client_address):
try:
self.handle_connection(request, client_address)
request.close()
except:
self.handle_error(request, client_address)
request.close()
def serve_forever(self, poll_interval=0.1):
self.__is_shut_down.clear()
try:
while not self.__shutdown_request:
r, w, e = select.select([self.socket], [], [], poll_interval)
if self.socket in r:
try:
request, client_address = self.socket.accept()
except socket.error:
return
try:
t = threading.Thread(
target = self.request_thread,
args = (request, client_address)
)
t.setDaemon(1)
t.start()
except:
self.handle_error(request, client_address)
request.close()
finally:
self.__shutdown_request = False
self.__is_shut_down.set()
def shutdown(self):
self.__shutdown_request = True
self.__is_shut_down.wait()
self.socket.close()
self.handle_shutdown()
def handle_error(self, request, client_address, fp=sys.stderr):
"""
Called when handle_connection raises an exception.
"""
print >> fp, '-'*40
print >> fp, "Error processing of request from %s:%s"%client_address
print >> fp, traceback.format_exc()
print >> fp, '-'*40
def handle_connection(self, request, client_address): # pragma: no cover
"""
Called after client connection.
"""
raise NotImplementedError
def handle_shutdown(self):
"""
Called after server shutdown.
"""
pass
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