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#
# Connection objects
#
# Copyright (c) 2002--2016 Red Hat, Inc.
#
# Author: Mihai Ibanescu <misa@redhat.com>
import base64
import encodings.idna
import socket
from platform import python_version
from rhn import SSL
from rhn import nonblocking
from rhn import i18n
try: # python2
import httplib
# Import into the local namespace some httplib-related names
from httplib import _CS_REQ_SENT, _CS_IDLE, ResponseNotReady
import xmlrpclib
except ImportError: # python3
import http.client as httplib
# Import into the local namespace some httplib-related names
from http.client import _CS_REQ_SENT, _CS_IDLE, ResponseNotReady
import xmlrpc.client as xmlrpclib
class HTTPResponse(httplib.HTTPResponse):
def set_callback(self, rs, ws, ex, user_data, callback):
if not isinstance(self.fp, nonblocking.NonBlockingFile):
self.fp = nonblocking.NonBlockingFile(self.fp)
self.fp.set_callback(rs, ws, ex, user_data, callback)
class HTTPConnection(httplib.HTTPConnection):
response_class = HTTPResponse
def __init__(self, host, port=None, timeout=SSL.DEFAULT_TIMEOUT):
if python_version() >= '2.6.1':
httplib.HTTPConnection.__init__(self, host, port, timeout=timeout)
else:
httplib.HTTPConnection.__init__(self, host, port)
self._cb_rs = []
self._cb_ws = []
self._cb_ex = []
self._cb_user_data = None
self._cb_callback = None
self._user_agent = "rhn.connections $Revision$ (python)"
self.timeout = timeout
def set_callback(self, rs, ws, ex, user_data, callback):
# XXX check the params
self._cb_rs = rs
self._cb_ws = ws
self._cb_ex = ex
self._cb_user_data = user_data
self._cb_callback = callback
def set_user_agent(self, user_agent):
self._user_agent = user_agent
# XXX Had to copy the function from httplib.py, because the nonblocking
# framework had to be initialized
def getresponse(self):
"Get the response from the server."
# check if a prior response has been completed
if self.__response and self.__response.isclosed():
self.__response = None
#
# if a prior response exists, then it must be completed (otherwise, we
# cannot read this response's header to determine the connection-close
# behavior)
#
# note: if a prior response existed, but was connection-close, then the
# socket and response were made independent of this HTTPConnection
# object since a new request requires that we open a whole new
# connection
#
# this means the prior response had one of two states:
# 1) will_close: this connection was reset and the prior socket and
# response operate independently
# 2) persistent: the response was retained and we await its
# isclosed() status to become true.
#
if self.__state != _CS_REQ_SENT or self.__response:
raise ResponseNotReady()
if self.debuglevel > 0:
response = self.response_class(self.sock, self.debuglevel)
else:
response = self.response_class(self.sock)
# The only modification compared to the stock HTTPConnection
if self._cb_callback:
response.set_callback(self._cb_rs, self._cb_ws, self._cb_ex,
self._cb_user_data, self._cb_callback)
response.begin()
assert response.will_close != httplib._UNKNOWN
self.__state = _CS_IDLE
if response.will_close:
# this effectively passes the connection to the response
self.close()
else:
# remember this, so we can tell when it is complete
self.__response = response
return response
def connect(self):
httplib.HTTPConnection.connect(self)
self.sock.settimeout(self.timeout)
class HTTPProxyConnection(HTTPConnection):
def __init__(self, proxy, host, port=None, username=None, password=None,
timeout=SSL.DEFAULT_TIMEOUT):
# The connection goes through the proxy
HTTPConnection.__init__(self, proxy, timeout=timeout)
# save the proxy values
self.__proxy, self.__proxy_port = self.host, self.port
# self.host and self.port will point to the real host
self._set_hostport(host, port)
# save the host and port
self._host, self._port = self.host, self.port
# Authenticated proxies support
self.__username = username
self.__password = password
def connect(self):
# We are actually connecting to the proxy
self._set_hostport(self.__proxy, self.__proxy_port)
HTTPConnection.connect(self)
# Restore the real host and port
self._set_hostport(self._host, self._port)
def putrequest(self, method, url, skip_host=0):
# The URL has to include the real host
hostname = self._host
if self._port != self.default_port:
hostname = hostname + ':' + str(self._port)
newurl = "http://%s%s" % (hostname, url)
# Piggyback on the parent class
HTTPConnection.putrequest(self, method, newurl, skip_host=skip_host)
# Add proxy-specific headers
self._add_proxy_headers()
def _add_proxy_headers(self):
if not self.__username:
return
# Authenticated proxy
userpass = "%s:%s" % (self.__username, self.__password)
enc_userpass = base64.encodestring(i18n.bstr(userpass)).replace(i18n.bstr("\n"), i18n.bstr(""))
self.putheader("Proxy-Authorization", "Basic %s" % i18n.sstr(enc_userpass))
def _set_hostport(self, host, port):
(self.host, self.port) = self._get_hostport(host, port)
class HTTPSConnection(HTTPConnection):
response_class = HTTPResponse
default_port = httplib.HTTPSConnection.default_port
def __init__(self, host, port=None, trusted_certs=None,
timeout=SSL.DEFAULT_TIMEOUT):
HTTPConnection.__init__(self, host, port, timeout=timeout)
trusted_certs = trusted_certs or []
self.trusted_certs = trusted_certs
def connect(self):
"Connect to a host on a given (SSL) port"
results = socket.getaddrinfo(self.host, self.port,
socket.AF_UNSPEC, socket.SOCK_STREAM)
for r in results:
af, socktype, proto, canonname, sa = r
try:
sock = socket.socket(af, socktype, proto)
except socket.error:
sock = None
continue
try:
sock.connect((self.host, self.port))
sock.settimeout(self.timeout)
except socket.error:
sock.close()
sock = None
continue
break
if sock is None:
raise socket.error("Unable to connect to the host and port specified")
self.sock = SSL.SSLSocket(sock, self.trusted_certs)
self.sock.init_ssl()
class HTTPSProxyResponse(HTTPResponse):
def begin(self):
HTTPResponse.begin(self)
self.will_close = 0
class HTTPSProxyConnection(HTTPProxyConnection):
default_port = HTTPSConnection.default_port
def __init__(self, proxy, host, port=None, username=None, password=None,
trusted_certs=None, timeout=SSL.DEFAULT_TIMEOUT):
HTTPProxyConnection.__init__(self, proxy, host, port, username,
password, timeout=timeout)
trusted_certs = trusted_certs or []
self.trusted_certs = trusted_certs
def connect(self):
# Set the connection with the proxy
HTTPProxyConnection.connect(self)
# Use the stock HTTPConnection putrequest
host = "%s:%s" % (self._host, self._port)
HTTPConnection.putrequest(self, "CONNECT", host)
# Add proxy-specific stuff
self._add_proxy_headers()
# And send the request
HTTPConnection.endheaders(self)
# Save the response class
response_class = self.response_class
# And replace the response class with our own one, which does not
# close the connection after
self.response_class = HTTPSProxyResponse
response = HTTPConnection.getresponse(self)
# Restore the response class
self.response_class = response_class
# Close the response object manually
response.close()
if response.status != 200:
# Close the connection manually
self.close()
raise xmlrpclib.ProtocolError(host,
response.status, response.reason, response.msg)
self.sock = SSL.SSLSocket(self.sock, self.trusted_certs)
self.sock.init_ssl()
def putrequest(self, method, url, skip_host=0):
return HTTPConnection.putrequest(self, method, url, skip_host=skip_host)
def _add_proxy_headers(self):
HTTPProxyConnection._add_proxy_headers(self)
# Add a User-Agent header
self.putheader("User-Agent", self._user_agent)
def idn_puny_to_unicode(hostname):
""" Convert Internationalized domain name from Punycode (RFC3492) to Unicode """
if hostname is None:
return None
else:
hostname = i18n.bstr(hostname)
return hostname.decode('idna')
def idn_ascii_to_puny(hostname):
""" Convert domain name to Punycode (RFC3492). Hostname can be instance of string or Unicode """
if hostname is None:
return None
else:
hostname = i18n.ustr(hostname)
return i18n.ustr(hostname.encode('idna'))