mercurial/httpclient/socketutil.py
author Augie Fackler <augie@google.com>
Sun, 17 May 2015 21:12:33 -0400
changeset 25157 a8d22895a575
parent 19748 59df9e52b5bb
child 25660 328739ea70c3
permissions -rw-r--r--
run-tests: introduce PYTHON3 boolean constant (issue4668) This will avoid open-coding lots of version_info checks later in the file.
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# Copyright 2010, Google Inc.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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#     * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#     * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following disclaimer
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# in the documentation and/or other materials provided with the
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# distribution.
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#     * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""Abstraction to simplify socket use for Python < 2.6
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This will attempt to use the ssl module and the new
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socket.create_connection method, but fall back to the old
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methods if those are unavailable.
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"""
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import logging
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import socket
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logger = logging.getLogger(__name__)
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try:
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    import ssl
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    # make demandimporters load the module
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    ssl.wrap_socket # pylint: disable=W0104
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    have_ssl = True
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except ImportError:
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    import httplib
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    import urllib2
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    have_ssl = getattr(urllib2, 'HTTPSHandler', False)
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    ssl = False
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try:
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    create_connection = socket.create_connection
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except AttributeError:
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    def create_connection(address):
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        """Backport of socket.create_connection from Python 2.6."""
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        host, port = address
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        msg = "getaddrinfo returns an empty list"
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        sock = None
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        for res in socket.getaddrinfo(host, port, 0,
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                                      socket.SOCK_STREAM):
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            af, socktype, proto, unused_canonname, sa = res
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            try:
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                sock = socket.socket(af, socktype, proto)
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                logger.info("connect: (%s, %s)", host, port)
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                sock.connect(sa)
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            except socket.error, msg:
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                logger.info('connect fail: %s %s', host, port)
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                if sock:
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                    sock.close()
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                sock = None
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                continue
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            break
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        if not sock:
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            raise socket.error(msg)
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        return sock
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if ssl:
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    wrap_socket = ssl.wrap_socket
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    CERT_NONE = ssl.CERT_NONE
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    CERT_OPTIONAL = ssl.CERT_OPTIONAL
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    CERT_REQUIRED = ssl.CERT_REQUIRED
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else:
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    class FakeSocket(httplib.FakeSocket):
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        """Socket wrapper that supports SSL."""
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        # Silence lint about this goofy backport class
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        # pylint: disable=W0232,E1101,R0903,R0913,C0111
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        # backport the behavior from Python 2.6, which is to busy wait
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        # on the socket instead of anything nice. Sigh.
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        # See http://bugs.python.org/issue3890 for more info.
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        def recv(self, buflen=1024, flags=0):
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            """ssl-aware wrapper around socket.recv
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            """
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            if flags != 0:
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                raise ValueError(
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                    "non-zero flags not allowed in calls to recv() on %s" %
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                    self.__class__)
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            while True:
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                try:
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                    return self._ssl.read(buflen)
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                except socket.sslerror, x:
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                    if x.args[0] == socket.SSL_ERROR_WANT_READ:
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                        continue
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                    else:
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                        raise x
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    _PROTOCOL_SSLv23 = 2
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    CERT_NONE = 0
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    CERT_OPTIONAL = 1
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    CERT_REQUIRED = 2
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    # Disable unused-argument because we're making a dumb wrapper
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    # that's like an upstream method.
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    #
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    # pylint: disable=W0613,R0913
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    def wrap_socket(sock, keyfile=None, certfile=None,
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                server_side=False, cert_reqs=CERT_NONE,
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                ssl_version=_PROTOCOL_SSLv23, ca_certs=None,
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                do_handshake_on_connect=True,
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                suppress_ragged_eofs=True):
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        """Backport of ssl.wrap_socket from Python 2.6."""
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        if cert_reqs != CERT_NONE and ca_certs:
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            raise CertificateValidationUnsupported(
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                'SSL certificate validation requires the ssl module'
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                '(included in Python 2.6 and later.)')
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        sslob = socket.ssl(sock)
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        # borrow httplib's workaround for no ssl.wrap_socket
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        sock = FakeSocket(sock, sslob)
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        return sock
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    # pylint: enable=W0613,R0913
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class CertificateValidationUnsupported(Exception):
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    """Exception raised when cert validation is requested but unavailable."""
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# no-check-code