Fix closes Issue11281 - smtplib.STMP gets source_address parameter, which adds the ability to bind to specific source address on a machine with multiple interfaces. Patch by Paulo Scardine.
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Senthil Kumaran
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@ -20,7 +20,7 @@ details of SMTP and ESMTP operation, consult :rfc:`821` (Simple Mail Transfer
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Protocol) and :rfc:`1869` (SMTP Service Extensions).
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.. class:: SMTP(host='', port=0, local_hostname=None[, timeout])
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.. class:: SMTP(host='', port=0, local_hostname=None[, timeout], source_address=None)
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A :class:`SMTP` instance encapsulates an SMTP connection. It has methods
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that support a full repertoire of SMTP and ESMTP operations. If the optional
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@ -29,7 +29,12 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
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raised if the specified host doesn't respond correctly. The optional
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*timeout* parameter specifies a timeout in seconds for blocking operations
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like the connection attempt (if not specified, the global default timeout
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setting will be used).
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setting will be used). The optional source_address parameter allows to bind to some
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specific source address in a machine with multiple network interfaces,
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and/or to some specific source tcp port. It takes a 2-tuple (host, port),
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for the socket to bind to as its source address before connecting. If
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ommited (or if host or port are '' and/or 0 respectively) the OS default
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behavior will be used.
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For normal use, you should only require the initialization/connect,
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:meth:`sendmail`, and :meth:`quit` methods. An example is included below.
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@ -48,8 +53,10 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
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.. versionchanged:: 3.3
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Support for the :keyword:`with` statement was added.
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.. versionadded:: 3.3
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source_address parameter.
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.. class:: SMTP_SSL(host='', port=0, local_hostname=None, keyfile=None, certfile=None[, timeout], context=None)
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.. class:: SMTP_SSL(host='', port=0, local_hostname=None, keyfile=None, certfile=None[, timeout], context=None, source_address=None)
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A :class:`SMTP_SSL` instance behaves exactly the same as instances of
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:class:`SMTP`. :class:`SMTP_SSL` should be used for situations where SSL is
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@ -62,18 +69,28 @@ Protocol) and :rfc:`1869` (SMTP Service Extensions).
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keyfile and certfile must be None. The optional *timeout*
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parameter specifies a timeout in seconds for blocking operations like the
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connection attempt (if not specified, the global default timeout setting
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will be used).
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will be used). The optional source_address parameter allows to bind to some
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specific source address in a machine with multiple network interfaces,
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and/or to some specific source tcp port. It takes a 2-tuple (host, port),
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for the socket to bind to as its source address before connecting. If
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ommited (or if host or port are '' and/or 0 respectively) the OS default
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behavior will be used.
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.. versionchanged:: 3.3
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*context* was added.
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.. versionadded:: 3.3
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source_address parameter.
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.. class:: LMTP(host='', port=LMTP_PORT, local_hostname=None)
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.. class:: LMTP(host='', port=LMTP_PORT, local_hostname=None, source_address=None)
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The LMTP protocol, which is very similar to ESMTP, is heavily based on the
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standard SMTP client. It's common to use Unix sockets for LMTP, so our :meth:`connect`
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method must support that as well as a regular host:port server. To specify a
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Unix socket, you must use an absolute path for *host*, starting with a '/'.
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standard SMTP client. It's common to use Unix sockets for LMTP, so our
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:meth:`connect` method must support that as well as a regular host:port
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server. The optional parameters local_hostname and source_address has the
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same meaning as that of SMTP client.To specify a Unix socket, you must use
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an absolute path for *host*, starting with a '/'.
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Authentication is supported, using the regular SMTP mechanism. When using a Unix
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socket, LMTP generally don't support or require any authentication, but your
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@ -215,7 +215,8 @@ class SMTP:
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default_port = SMTP_PORT
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def __init__(self, host='', port=0, local_hostname=None,
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT):
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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source_address=None):
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"""Initialize a new instance.
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If specified, `host' is the name of the remote host to which to
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@ -223,11 +224,16 @@ class SMTP:
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By default, smtplib.SMTP_PORT is used. An SMTPConnectError is raised
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if the specified `host' doesn't respond correctly. If specified,
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`local_hostname` is used as the FQDN of the local host. By default,
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the local hostname is found using socket.getfqdn().
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the local hostname is found using socket.getfqdn(). The
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`source_address` parameter takes a 2-tuple (host, port) for the socket
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to bind to as its source address before connecting. If the host is ''
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and port is 0, the OS default behavior will be used.
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"""
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self.timeout = timeout
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self.esmtp_features = {}
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self.source_address = source_address
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if host:
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(code, msg) = self.connect(host, port)
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if code != 220:
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@ -276,10 +282,11 @@ class SMTP:
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# This makes it simpler for SMTP_SSL to use the SMTP connect code
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# and just alter the socket connection bit.
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if self.debuglevel > 0:
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print('connect:', (host, port), file=stderr)
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return socket.create_connection((host, port), timeout)
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print('connect: to', (host, port), self.source_address, file=stderr)
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return socket.create_connection((host, port), timeout,
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self.source_address)
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def connect(self, host='localhost', port=0):
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def connect(self, host='localhost', port=0, source_address=None):
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"""Connect to a host on a given port.
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If the hostname ends with a colon (`:') followed by a number, and
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@ -290,6 +297,7 @@ class SMTP:
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specified during instantiation.
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"""
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if source_address: self.source_address = source_address
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if not port and (host.find(':') == host.rfind(':')):
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i = host.rfind(':')
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if i >= 0:
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@ -829,7 +837,8 @@ if _have_ssl:
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""" This is a subclass derived from SMTP that connects over an SSL encrypted
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socket (to use this class you need a socket module that was compiled with SSL
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support). If host is not specified, '' (the local host) is used. If port is
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omitted, the standard SMTP-over-SSL port (465) is used. keyfile and certfile
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omitted, the standard SMTP-over-SSL port (465) is used. The optional
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source_address takes a two-tuple (host,port) for socket to bind to. keyfile and certfile
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are also optional - they can contain a PEM formatted private key and
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certificate chain file for the SSL connection. context also optional, can contain
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a SSLContext, and is an alternative to keyfile and certfile; If it is specified both
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@ -840,7 +849,8 @@ if _have_ssl:
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def __init__(self, host='', port=0, local_hostname=None,
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keyfile=None, certfile=None,
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT, context=None):
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timeout=socket._GLOBAL_DEFAULT_TIMEOUT,
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source_address=None, context=None):
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if context is not None and keyfile is not None:
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raise ValueError("context and keyfile arguments are mutually "
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"exclusive")
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@ -850,12 +860,14 @@ if _have_ssl:
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self.keyfile = keyfile
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self.certfile = certfile
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self.context = context
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SMTP.__init__(self, host, port, local_hostname, timeout)
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SMTP.__init__(self, host, port, local_hostname, timeout,
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source_address)
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def _get_socket(self, host, port, timeout):
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if self.debuglevel > 0:
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print('connect:', (host, port), file=stderr)
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new_socket = socket.create_connection((host, port), timeout)
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new_socket = socket.create_connection((host, port), timeout,
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self.source_address)
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if self.context is not None:
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new_socket = self.context.wrap_socket(new_socket)
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else:
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@ -884,14 +896,16 @@ class LMTP(SMTP):
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ehlo_msg = "lhlo"
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def __init__(self, host='', port=LMTP_PORT, local_hostname=None):
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def __init__(self, host='', port=LMTP_PORT, local_hostname=None,
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source_address=None):
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"""Initialize a new instance."""
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SMTP.__init__(self, host, port, local_hostname)
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SMTP.__init__(self, host, port, local_hostname = local_hostname,
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source_address = source_address)
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def connect(self, host='localhost', port=0):
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def connect(self, host='localhost', port=0, source_address=None):
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"""Connect to the LMTP daemon, on either a Unix or a TCP socket."""
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if host[0] != '/':
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return SMTP.connect(self, host, port)
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return SMTP.connect(self, host, port, source_address = source_address)
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# Handle Unix-domain sockets.
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try:
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@ -106,7 +106,8 @@ def socket(family=None, type=None, proto=None):
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return MockSocket()
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def create_connection(address, timeout=socket_module._GLOBAL_DEFAULT_TIMEOUT):
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def create_connection(address, timeout=socket_module._GLOBAL_DEFAULT_TIMEOUT,
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source_address=None):
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try:
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int_port = int(address[1])
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except ValueError:
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@ -72,6 +72,14 @@ class GeneralTests(unittest.TestCase):
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smtp = smtplib.SMTP(HOST, self.port)
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smtp.close()
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def testSourceAddress(self):
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mock_socket.reply_with(b"220 Hola mundo")
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# connects
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smtp = smtplib.SMTP(HOST, self.port,
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source_address=('127.0.0.1',19876))
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self.assertEqual(smtp.source_address, ('127.0.0.1', 19876))
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smtp.close()
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def testBasic2(self):
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mock_socket.reply_with(b"220 Hola mundo")
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# connects, include port in host name
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@ -206,6 +214,15 @@ class DebuggingServerTests(unittest.TestCase):
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smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
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smtp.quit()
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def testSourceAddress(self):
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# connect
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smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3,
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source_address=('127.0.0.1', 19876))
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self.assertEqual(smtp.source_address, ('127.0.0.1', 19876))
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self.assertEqual(smtp.local_hostname, 'localhost')
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print(dir(smtp))
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smtp.quit()
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def testNOOP(self):
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smtp = smtplib.SMTP(HOST, self.port, local_hostname='localhost', timeout=3)
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expected = (250, b'Ok')
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@ -246,6 +246,10 @@ Core and Builtins
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Library
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-------
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- Issue #11281: smtplib.STMP gets source_address parameter, which adds the
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ability to bind to specific source address on a machine with multiple
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interfaces. Patch by Paulo Scardine.
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- Issue #12464: tempfile.TemporaryDirectory.cleanup() should not follow
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symlinks: fix it. Patch by Petri Lehtinen.
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