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Diffstat (limited to 'modules/language/python/module/smtplib.py')
| -rwxr-xr-x | modules/language/python/module/smtplib.py | 1116 |
1 files changed, 1116 insertions, 0 deletions
diff --git a/modules/language/python/module/smtplib.py b/modules/language/python/module/smtplib.py new file mode 100755 index 0000000..54c2de2 --- /dev/null +++ b/modules/language/python/module/smtplib.py @@ -0,0 +1,1116 @@ +module(smtplib) +#! /usr/bin/python3.6 + +'''SMTP/ESMTP client class. + +This should follow RFC 821 (SMTP), RFC 1869 (ESMTP), RFC 2554 (SMTP +Authentication) and RFC 2487 (Secure SMTP over TLS). + +Notes: + +Please remember, when doing ESMTP, that the names of the SMTP service +extensions are NOT the same thing as the option keywords for the RCPT +and MAIL commands! + +Example: + + >>> import smtplib + >>> s=smtplib.SMTP("localhost") + >>> print(s.help()) + This is Sendmail version 8.8.4 + Topics: + HELO EHLO MAIL RCPT DATA + RSET NOOP QUIT HELP VRFY + EXPN VERB ETRN DSN + For more info use "HELP <topic>". + To report bugs in the implementation send email to + sendmail-bugs@sendmail.org. + For local information send email to Postmaster at your site. + End of HELP info + >>> s.putcmd("vrfy","someone@here") + >>> s.getreply() + (250, "Somebody OverHere <somebody@here.my.org>") + >>> s.quit() +''' + +# Author: The Dragon De Monsyne <dragondm@integral.org> +# ESMTP support, test code and doc fixes added by +# Eric S. Raymond <esr@thyrsus.com> +# Better RFC 821 compliance (MAIL and RCPT, and CRLF in data) +# by Carey Evans <c.evans@clear.net.nz>, for picky mail servers. +# RFC 2554 (authentication) support by Gerhard Haering <gerhard@bigfoot.de>. +# +# This was modified from the Python 1.5 library HTTP lib. + +import socket +import io +import re +import email.utils +import email.message +import email.generator +import base64 +import hmac +import copy +import datetime +import sys +from email.base64mime import body_encode as encode_base64 + +__all__ = ["SMTPException", "SMTPServerDisconnected", "SMTPResponseException", + "SMTPSenderRefused", "SMTPRecipientsRefused", "SMTPDataError", + "SMTPConnectError", "SMTPHeloError", "SMTPAuthenticationError", + "quoteaddr", "quotedata", "SMTP"] + +SMTP_PORT = 25 +SMTP_SSL_PORT = 465 +CRLF = "\r\n" +bCRLF = b"\r\n" +_MAXLINE = 8192 # more than 8 times larger than RFC 821, 4.5.3 + +OLDSTYLE_AUTH = re.compile(r"auth=(.*)", re.I) + +# Exception classes used by this module. +class SMTPException(OSError): + """Base class for all exceptions raised by this module.""" + +class SMTPNotSupportedError(SMTPException): + """The command or option is not supported by the SMTP server. + + This exception is raised when an attempt is made to run a command or a + command with an option which is not supported by the server. + """ + +class SMTPServerDisconnected(SMTPException): + """Not connected to any SMTP server. + + This exception is raised when the server unexpectedly disconnects, + or when an attempt is made to use the SMTP instance before + connecting it to a server. + """ + +class SMTPResponseException(SMTPException): + """Base class for all exceptions that include an SMTP error code. + + These exceptions are generated in some instances when the SMTP + server returns an error code. The error code is stored in the + `smtp_code' attribute of the error, and the `smtp_error' attribute + is set to the error message. + """ + + def __init__(self, code, msg): + self.smtp_code = code + self.smtp_error = msg + self.args = (code, msg) + +class SMTPSenderRefused(SMTPResponseException): + """Sender address refused. + + In addition to the attributes set by on all SMTPResponseException + exceptions, this sets `sender' to the string that the SMTP refused. + """ + + def __init__(self, code, msg, sender): + self.smtp_code = code + self.smtp_error = msg + self.sender = sender + self.args = (code, msg, sender) + +class SMTPRecipientsRefused(SMTPException): + """All recipient addresses refused. + + The errors for each recipient are accessible through the attribute + 'recipients', which is a dictionary of exactly the same sort as + SMTP.sendmail() returns. + """ + + def __init__(self, recipients): + self.recipients = recipients + self.args = (recipients,) + + +class SMTPDataError(SMTPResponseException): + """The SMTP server didn't accept the data.""" + +class SMTPConnectError(SMTPResponseException): + """Error during connection establishment.""" + +class SMTPHeloError(SMTPResponseException): + """The server refused our HELO reply.""" + +class SMTPAuthenticationError(SMTPResponseException): + """Authentication error. + + Most probably the server didn't accept the username/password + combination provided. + """ + +def quoteaddr(addrstring): + """Quote a subset of the email addresses defined by RFC 821. + + Should be able to handle anything email.utils.parseaddr can handle. + """ + displayname, addr = email.utils.parseaddr(addrstring) + if (displayname, addr) == ('', ''): + # parseaddr couldn't parse it, use it as is and hope for the best. + if addrstring.strip().startswith('<'): + return addrstring + return "<%s>" % addrstring + return "<%s>" % addr + +def _addr_only(addrstring): + displayname, addr = email.utils.parseaddr(addrstring) + if (displayname, addr) == ('', ''): + # parseaddr couldn't parse it, so use it as is. + return addrstring + return addr + +# Legacy method kept for backward compatibility. +def quotedata(data): + """Quote data for email. + + Double leading '.', and change Unix newline '\\n', or Mac '\\r' into + Internet CRLF end-of-line. + """ + return re.sub(r'(?m)^\.', '..', + re.sub(r'(?:\r\n|\n|\r(?!\n))', CRLF, data)) + +def _quote_periods(bindata): + return re.sub(br'(?m)^\.', b'..', bindata) + +def _fix_eols(data): + return re.sub(r'(?:\r\n|\n|\r(?!\n))', CRLF, data) + +try: + import ssl +except ImportError: + _have_ssl = False +else: + _have_ssl = True + + +class SMTP: + """This class manages a connection to an SMTP or ESMTP server. + SMTP Objects: + SMTP objects have the following attributes: + helo_resp + This is the message given by the server in response to the + most recent HELO command. + + ehlo_resp + This is the message given by the server in response to the + most recent EHLO command. This is usually multiline. + + does_esmtp + This is a True value _after you do an EHLO command_, if the + server supports ESMTP. + + esmtp_features + This is a dictionary, which, if the server supports ESMTP, + will _after you do an EHLO command_, contain the names of the + SMTP service extensions this server supports, and their + parameters (if any). + + Note, all extension names are mapped to lower case in the + dictionary. + + See each method's docstrings for details. In general, there is a + method of the same name to perform each SMTP command. There is also a + method called 'sendmail' that will do an entire mail transaction. + """ + debuglevel = 0 + file = None + helo_resp = None + ehlo_msg = "ehlo" + ehlo_resp = None + does_esmtp = 0 + default_port = SMTP_PORT + + def __init__(self, host='', port=0, local_hostname=None, + timeout=socket._GLOBAL_DEFAULT_TIMEOUT, + source_address=None): + """Initialize a new instance. + + If specified, `host' is the name of the remote host to which to + connect. If specified, `port' specifies the port to which to connect. + By default, smtplib.SMTP_PORT is used. If a host is specified the + connect method is called, and if it returns anything other than a + success code an SMTPConnectError is raised. If specified, + `local_hostname` is used as the FQDN of the local host in the HELO/EHLO + command. Otherwise, the local hostname is found using + socket.getfqdn(). The `source_address` parameter takes a 2-tuple (host, + port) for the socket to bind to as its source address before + connecting. If the host is '' and port is 0, the OS default behavior + will be used. + + """ + self._host = host + self.timeout = timeout + self.esmtp_features = {} + self.command_encoding = 'ascii' + self.source_address = source_address + + if host: + (code, msg) = self.connect(host, port) + if code != 220: + self.close() + raise SMTPConnectError(code, msg) + if local_hostname is not None: + self.local_hostname = local_hostname + else: + # RFC 2821 says we should use the fqdn in the EHLO/HELO verb, and + # if that can't be calculated, that we should use a domain literal + # instead (essentially an encoded IP address like [A.B.C.D]). + fqdn = socket.getfqdn() + if '.' in fqdn: + self.local_hostname = fqdn + else: + # We can't find an fqdn hostname, so use a domain literal + addr = '127.0.0.1' + try: + addr = socket.gethostbyname(socket.gethostname()) + except socket.gaierror: + pass + self.local_hostname = '[%s]' % addr + + def __enter__(self): + return self + + def __exit__(self, *args): + try: + code, message = self.docmd("QUIT") + if code != 221: + raise SMTPResponseException(code, message) + except SMTPServerDisconnected: + pass + finally: + self.close() + + def set_debuglevel(self, debuglevel): + """Set the debug output level. + + A non-false value results in debug messages for connection and for all + messages sent to and received from the server. + + """ + self.debuglevel = debuglevel + + def _print_debug(self, *args): + if self.debuglevel > 1: + print(datetime.datetime.now().time(), *args, file=sys.stderr) + else: + print(*args, file=sys.stderr) + + def _get_socket(self, host, port, timeout): + # This makes it simpler for SMTP_SSL to use the SMTP connect code + # and just alter the socket connection bit. + if self.debuglevel > 0: + self._print_debug('connect: to', (host, port), self.source_address) + return socket.create_connection((host, port), timeout, + self.source_address) + + def connect(self, host='localhost', port=0, source_address=None): + """Connect to a host on a given port. + + If the hostname ends with a colon (`:') followed by a number, and + there is no port specified, that suffix will be stripped off and the + number interpreted as the port number to use. + + Note: This method is automatically invoked by __init__, if a host is + specified during instantiation. + + """ + + if source_address: + self.source_address = source_address + + if not port and (host.find(':') == host.rfind(':')): + i = host.rfind(':') + if i >= 0: + host, port = host[:i], host[i + 1:] + try: + port = int(port) + except ValueError: + raise OSError("nonnumeric port") + if not port: + port = self.default_port + if self.debuglevel > 0: + self._print_debug('connect:', (host, port)) + self.sock = self._get_socket(host, port, self.timeout) + self.file = None + (code, msg) = self.getreply() + if self.debuglevel > 0: + self._print_debug('connect:', repr(msg)) + return (code, msg) + + def send(self, s): + """Send `s' to the server.""" + if self.debuglevel > 0: + self._print_debug('send:', repr(s)) + if hasattr(self, 'sock') and self.sock: + if isinstance(s, str): + # send is used by the 'data' command, where command_encoding + # should not be used, but 'data' needs to convert the string to + # binary itself anyway, so that's not a problem. + s = s.encode(self.command_encoding) + try: + self.sock.sendall(s) + except OSError: + self.close() + raise SMTPServerDisconnected('Server not connected') + else: + raise SMTPServerDisconnected('please run connect() first') + + def putcmd(self, cmd, args=""): + """Send a command to the server.""" + if args == "": + str = '%s%s' % (cmd, CRLF) + else: + str = '%s %s%s' % (cmd, args, CRLF) + self.send(str) + + def getreply(self): + """Get a reply from the server. + + Returns a tuple consisting of: + + - server response code (e.g. '250', or such, if all goes well) + Note: returns -1 if it can't read response code. + + - server response string corresponding to response code (multiline + responses are converted to a single, multiline string). + + Raises SMTPServerDisconnected if end-of-file is reached. + """ + resp = [] + if self.file is None: + self.file = self.sock.makefile('rb') + while 1: + try: + line = self.file.readline(_MAXLINE + 1) + except OSError as e: + self.close() + raise SMTPServerDisconnected("Connection unexpectedly closed: " + + str(e)) + if not line: + self.close() + raise SMTPServerDisconnected("Connection unexpectedly closed") + if self.debuglevel > 0: + self._print_debug('reply:', repr(line)) + if len(line) > _MAXLINE: + self.close() + raise SMTPResponseException(500, "Line too long.") + resp.append(line[4:].strip(b' \t\r\n')) + code = line[:3] + # Check that the error code is syntactically correct. + # Don't attempt to read a continuation line if it is broken. + try: + errcode = int(code) + except ValueError: + errcode = -1 + break + # Check if multiline response. + if line[3:4] != b"-": + break + + errmsg = b"\n".join(resp) + if self.debuglevel > 0: + self._print_debug('reply: retcode (%s); Msg: %a' % (errcode, errmsg)) + return errcode, errmsg + + def docmd(self, cmd, args=""): + """Send a command, and return its response code.""" + self.putcmd(cmd, args) + return self.getreply() + + # std smtp commands + def helo(self, name=''): + """SMTP 'helo' command. + Hostname to send for this command defaults to the FQDN of the local + host. + """ + self.putcmd("helo", name or self.local_hostname) + (code, msg) = self.getreply() + self.helo_resp = msg + return (code, msg) + + def ehlo(self, name=''): + """ SMTP 'ehlo' command. + Hostname to send for this command defaults to the FQDN of the local + host. + """ + self.esmtp_features = {} + self.putcmd(self.ehlo_msg, name or self.local_hostname) + (code, msg) = self.getreply() + # According to RFC1869 some (badly written) + # MTA's will disconnect on an ehlo. Toss an exception if + # that happens -ddm + if code == -1 and len(msg) == 0: + self.close() + raise SMTPServerDisconnected("Server not connected") + self.ehlo_resp = msg + if code != 250: + return (code, msg) + self.does_esmtp = 1 + #parse the ehlo response -ddm + assert isinstance(self.ehlo_resp, bytes), repr(self.ehlo_resp) + resp = self.ehlo_resp.decode("latin-1").split('\n') + del resp[0] + for each in resp: + # To be able to communicate with as many SMTP servers as possible, + # we have to take the old-style auth advertisement into account, + # because: + # 1) Else our SMTP feature parser gets confused. + # 2) There are some servers that only advertise the auth methods we + # support using the old style. + auth_match = OLDSTYLE_AUTH.match(each) + if auth_match: + # This doesn't remove duplicates, but that's no problem + self.esmtp_features["auth"] = self.esmtp_features.get("auth", "") \ + + " " + auth_match.groups(0)[0] + continue + + # RFC 1869 requires a space between ehlo keyword and parameters. + # It's actually stricter, in that only spaces are allowed between + # parameters, but were not going to check for that here. Note + # that the space isn't present if there are no parameters. + m = re.match(r'(?P<feature>[A-Za-z0-9][A-Za-z0-9\-]*) ?', each) + if m: + feature = m.group("feature").lower() + params = m.string[m.end("feature"):].strip() + if feature == "auth": + self.esmtp_features[feature] = self.esmtp_features.get(feature, "") \ + + " " + params + else: + self.esmtp_features[feature] = params + return (code, msg) + + def has_extn(self, opt): + """Does the server support a given SMTP service extension?""" + return opt.lower() in self.esmtp_features + + def help(self, args=''): + """SMTP 'help' command. + Returns help text from server.""" + self.putcmd("help", args) + return self.getreply()[1] + + def rset(self): + """SMTP 'rset' command -- resets session.""" + self.command_encoding = 'ascii' + return self.docmd("rset") + + def _rset(self): + """Internal 'rset' command which ignores any SMTPServerDisconnected error. + + Used internally in the library, since the server disconnected error + should appear to the application when the *next* command is issued, if + we are doing an internal "safety" reset. + """ + try: + self.rset() + except SMTPServerDisconnected: + pass + + def noop(self): + """SMTP 'noop' command -- doesn't do anything :>""" + return self.docmd("noop") + + def mail(self, sender, options=[]): + """SMTP 'mail' command -- begins mail xfer session. + + This method may raise the following exceptions: + + SMTPNotSupportedError The options parameter includes 'SMTPUTF8' + but the SMTPUTF8 extension is not supported by + the server. + """ + optionlist = '' + if options and self.does_esmtp: + if any(x.lower()=='smtputf8' for x in options): + if self.has_extn('smtputf8'): + self.command_encoding = 'utf-8' + else: + raise SMTPNotSupportedError( + 'SMTPUTF8 not supported by server') + optionlist = ' ' + ' '.join(options) + self.putcmd("mail", "FROM:%s%s" % (quoteaddr(sender), optionlist)) + return self.getreply() + + def rcpt(self, recip, options=[]): + """SMTP 'rcpt' command -- indicates 1 recipient for this mail.""" + optionlist = '' + if options and self.does_esmtp: + optionlist = ' ' + ' '.join(options) + self.putcmd("rcpt", "TO:%s%s" % (quoteaddr(recip), optionlist)) + return self.getreply() + + def data(self, msg): + """SMTP 'DATA' command -- sends message data to server. + + Automatically quotes lines beginning with a period per rfc821. + Raises SMTPDataError if there is an unexpected reply to the + DATA command; the return value from this method is the final + response code received when the all data is sent. If msg + is a string, lone '\\r' and '\\n' characters are converted to + '\\r\\n' characters. If msg is bytes, it is transmitted as is. + """ + self.putcmd("data") + (code, repl) = self.getreply() + if self.debuglevel > 0: + self._print_debug('data:', (code, repl)) + if code != 354: + raise SMTPDataError(code, repl) + else: + if isinstance(msg, str): + msg = _fix_eols(msg).encode('ascii') + q = _quote_periods(msg) + if q[-2:] != bCRLF: + q = q + bCRLF + q = q + b"." + bCRLF + self.send(q) + (code, msg) = self.getreply() + if self.debuglevel > 0: + self._print_debug('data:', (code, msg)) + return (code, msg) + + def verify(self, address): + """SMTP 'verify' command -- checks for address validity.""" + self.putcmd("vrfy", _addr_only(address)) + return self.getreply() + # a.k.a. + vrfy = verify + + def expn(self, address): + """SMTP 'expn' command -- expands a mailing list.""" + self.putcmd("expn", _addr_only(address)) + return self.getreply() + + # some useful methods + + def ehlo_or_helo_if_needed(self): + """Call self.ehlo() and/or self.helo() if needed. + + If there has been no previous EHLO or HELO command this session, this + method tries ESMTP EHLO first. + + This method may raise the following exceptions: + + SMTPHeloError The server didn't reply properly to + the helo greeting. + """ + if self.helo_resp is None and self.ehlo_resp is None: + if not (200 <= self.ehlo()[0] <= 299): + (code, resp) = self.helo() + if not (200 <= code <= 299): + raise SMTPHeloError(code, resp) + + def auth(self, mechanism, authobject, *, initial_response_ok=True): + """Authentication command - requires response processing. + + 'mechanism' specifies which authentication mechanism is to + be used - the valid values are those listed in the 'auth' + element of 'esmtp_features'. + + 'authobject' must be a callable object taking a single argument: + + data = authobject(challenge) + + It will be called to process the server's challenge response; the + challenge argument it is passed will be a bytes. It should return + bytes data that will be base64 encoded and sent to the server. + + Keyword arguments: + - initial_response_ok: Allow sending the RFC 4954 initial-response + to the AUTH command, if the authentication methods supports it. + """ + # RFC 4954 allows auth methods to provide an initial response. Not all + # methods support it. By definition, if they return something other + # than None when challenge is None, then they do. See issue #15014. + mechanism = mechanism.upper() + initial_response = (authobject() if initial_response_ok else None) + if initial_response is not None: + response = encode_base64(initial_response.encode('ascii'), eol='') + (code, resp) = self.docmd("AUTH", mechanism + " " + response) + else: + (code, resp) = self.docmd("AUTH", mechanism) + # If server responds with a challenge, send the response. + if code == 334: + challenge = base64.decodebytes(resp) + response = encode_base64( + authobject(challenge).encode('ascii'), eol='') + (code, resp) = self.docmd(response) + if code in (235, 503): + return (code, resp) + raise SMTPAuthenticationError(code, resp) + + def auth_cram_md5(self, challenge=None): + """ Authobject to use with CRAM-MD5 authentication. Requires self.user + and self.password to be set.""" + # CRAM-MD5 does not support initial-response. + if challenge is None: + return None + return self.user + " " + hmac.HMAC( + self.password.encode('ascii'), challenge, 'md5').hexdigest() + + def auth_plain(self, challenge=None): + """ Authobject to use with PLAIN authentication. Requires self.user and + self.password to be set.""" + return "\0%s\0%s" % (self.user, self.password) + + def auth_login(self, challenge=None): + """ Authobject to use with LOGIN authentication. Requires self.user and + self.password to be set.""" + if challenge is None: + return self.user + else: + return self.password + + def login(self, user, password, *, initial_response_ok=True): + """Log in on an SMTP server that requires authentication. + + The arguments are: + - user: The user name to authenticate with. + - password: The password for the authentication. + + Keyword arguments: + - initial_response_ok: Allow sending the RFC 4954 initial-response + to the AUTH command, if the authentication methods supports it. + + If there has been no previous EHLO or HELO command this session, this + method tries ESMTP EHLO first. + + This method will return normally if the authentication was successful. + + This method may raise the following exceptions: + + SMTPHeloError The server didn't reply properly to + the helo greeting. + SMTPAuthenticationError The server didn't accept the username/ + password combination. + SMTPNotSupportedError The AUTH command is not supported by the + server. + SMTPException No suitable authentication method was + found. + """ + + self.ehlo_or_helo_if_needed() + if not self.has_extn("auth"): + raise SMTPNotSupportedError( + "SMTP AUTH extension not supported by server.") + + # Authentication methods the server claims to support + advertised_authlist = self.esmtp_features["auth"].split() + + # Authentication methods we can handle in our preferred order: + preferred_auths = ['CRAM-MD5', 'PLAIN', 'LOGIN'] + + # We try the supported authentications in our preferred order, if + # the server supports them. + authlist = [auth for auth in preferred_auths + if auth in advertised_authlist] + if not authlist: + raise SMTPException("No suitable authentication method found.") + + # Some servers advertise authentication methods they don't really + # support, so if authentication fails, we continue until we've tried + # all methods. + self.user, self.password = user, password + for authmethod in authlist: + method_name = 'auth_' + authmethod.lower().replace('-', '_') + try: + (code, resp) = self.auth( + authmethod, getattr(self, method_name), + initial_response_ok=initial_response_ok) + # 235 == 'Authentication successful' + # 503 == 'Error: already authenticated' + if code in (235, 503): + return (code, resp) + except SMTPAuthenticationError as e: + last_exception = e + + # We could not login successfully. Return result of last attempt. + raise last_exception + + def starttls(self, keyfile=None, certfile=None, context=None): + """Puts the connection to the SMTP server into TLS mode. + + If there has been no previous EHLO or HELO command this session, this + method tries ESMTP EHLO first. + + If the server supports TLS, this will encrypt the rest of the SMTP + session. If you provide the keyfile and certfile parameters, + the identity of the SMTP server and client can be checked. This, + however, depends on whether the socket module really checks the + certificates. + + This method may raise the following exceptions: + + SMTPHeloError The server didn't reply properly to + the helo greeting. + """ + self.ehlo_or_helo_if_needed() + if not self.has_extn("starttls"): + raise SMTPNotSupportedError( + "STARTTLS extension not supported by server.") + (resp, reply) = self.docmd("STARTTLS") + if resp == 220: + if not _have_ssl: + raise RuntimeError("No SSL support included in this Python") + if context is not None and keyfile is not None: + raise ValueError("context and keyfile arguments are mutually " + "exclusive") + if context is not None and certfile is not None: + raise ValueError("context and certfile arguments are mutually " + "exclusive") + if keyfile is not None or certfile is not None: + import warnings + warnings.warn("keyfile and certfile are deprecated, use a" + "custom context instead", DeprecationWarning, 2) + if context is None: + context = ssl._create_stdlib_context(certfile=certfile, + keyfile=keyfile) + self.sock = context.wrap_socket(self.sock, + server_hostname=self._host) + self.file = None + # RFC 3207: + # The client MUST discard any knowledge obtained from + # the server, such as the list of SMTP service extensions, + # which was not obtained from the TLS negotiation itself. + self.helo_resp = None + self.ehlo_resp = None + self.esmtp_features = {} + self.does_esmtp = 0 + else: + # RFC 3207: + # 501 Syntax error (no parameters allowed) + # 454 TLS not available due to temporary reason + raise SMTPResponseException(resp, reply) + return (resp, reply) + + def sendmail(self, from_addr, to_addrs, msg, mail_options=[], + rcpt_options=[]): + """This command performs an entire mail transaction. + + The arguments are: + - from_addr : The address sending this mail. + - to_addrs : A list of addresses to send this mail to. A bare + string will be treated as a list with 1 address. + - msg : The message to send. + - mail_options : List of ESMTP options (such as 8bitmime) for the + mail command. + - rcpt_options : List of ESMTP options (such as DSN commands) for + all the rcpt commands. + + msg may be a string containing characters in the ASCII range, or a byte + string. A string is encoded to bytes using the ascii codec, and lone + \\r and \\n characters are converted to \\r\\n characters. + + If there has been no previous EHLO or HELO command this session, this + method tries ESMTP EHLO first. If the server does ESMTP, message size + and each of the specified options will be passed to it. If EHLO + fails, HELO will be tried and ESMTP options suppressed. + + This method will return normally if the mail is accepted for at least + one recipient. It returns a dictionary, with one entry for each + recipient that was refused. Each entry contains a tuple of the SMTP + error code and the accompanying error message sent by the server. + + This method may raise the following exceptions: + + SMTPHeloError The server didn't reply properly to + the helo greeting. + SMTPRecipientsRefused The server rejected ALL recipients + (no mail was sent). + SMTPSenderRefused The server didn't accept the from_addr. + SMTPDataError The server replied with an unexpected + error code (other than a refusal of + a recipient). + SMTPNotSupportedError The mail_options parameter includes 'SMTPUTF8' + but the SMTPUTF8 extension is not supported by + the server. + + Note: the connection will be open even after an exception is raised. + + Example: + + >>> import smtplib + >>> s=smtplib.SMTP("localhost") + >>> tolist=["one@one.org","two@two.org","three@three.org","four@four.org"] + >>> msg = '''\\ + ... From: Me@my.org + ... Subject: testin'... + ... + ... This is a test ''' + >>> s.sendmail("me@my.org",tolist,msg) + { "three@three.org" : ( 550 ,"User unknown" ) } + >>> s.quit() + + In the above example, the message was accepted for delivery to three + of the four addresses, and one was rejected, with the error code + 550. If all addresses are accepted, then the method will return an + empty dictionary. + + """ + self.ehlo_or_helo_if_needed() + esmtp_opts = [] + if isinstance(msg, str): + msg = _fix_eols(msg).encode('ascii') + if self.does_esmtp: + if self.has_extn('size'): + esmtp_opts.append("size=%d" % len(msg)) + for option in mail_options: + esmtp_opts.append(option) + (code, resp) = self.mail(from_addr, esmtp_opts) + if code != 250: + if code == 421: + self.close() + else: + self._rset() + raise SMTPSenderRefused(code, resp, from_addr) + senderrs = {} + if isinstance(to_addrs, str): + to_addrs = [to_addrs] + for each in to_addrs: + (code, resp) = self.rcpt(each, rcpt_options) + if (code != 250) and (code != 251): + senderrs[each] = (code, resp) + if code == 421: + self.close() + raise SMTPRecipientsRefused(senderrs) + if len(senderrs) == len(to_addrs): + # the server refused all our recipients + self._rset() + raise SMTPRecipientsRefused(senderrs) + (code, resp) = self.data(msg) + if code != 250: + if code == 421: + self.close() + else: + self._rset() + raise SMTPDataError(code, resp) + #if we got here then somebody got our mail + return senderrs + + def send_message(self, msg, from_addr=None, to_addrs=None, + mail_options=[], rcpt_options={}): + """Converts message to a bytestring and passes it to sendmail. + + The arguments are as for sendmail, except that msg is an + email.message.Message object. If from_addr is None or to_addrs is + None, these arguments are taken from the headers of the Message as + described in RFC 2822 (a ValueError is raised if there is more than + one set of 'Resent-' headers). Regardless of the values of from_addr and + to_addr, any Bcc field (or Resent-Bcc field, when the Message is a + resent) of the Message object won't be transmitted. The Message + object is then serialized using email.generator.BytesGenerator and + sendmail is called to transmit the message. If the sender or any of + the recipient addresses contain non-ASCII and the server advertises the + SMTPUTF8 capability, the policy is cloned with utf8 set to True for the + serialization, and SMTPUTF8 and BODY=8BITMIME are asserted on the send. + If the server does not support SMTPUTF8, an SMTPNotSupported error is + raised. Otherwise the generator is called without modifying the + policy. + + """ + # 'Resent-Date' is a mandatory field if the Message is resent (RFC 2822 + # Section 3.6.6). In such a case, we use the 'Resent-*' fields. However, + # if there is more than one 'Resent-' block there's no way to + # unambiguously determine which one is the most recent in all cases, + # so rather than guess we raise a ValueError in that case. + # + # TODO implement heuristics to guess the correct Resent-* block with an + # option allowing the user to enable the heuristics. (It should be + # possible to guess correctly almost all of the time.) + + self.ehlo_or_helo_if_needed() + resent = msg.get_all('Resent-Date') + if resent is None: + header_prefix = '' + elif len(resent) == 1: + header_prefix = 'Resent-' + else: + raise ValueError("message has more than one 'Resent-' header block") + if from_addr is None: + # Prefer the sender field per RFC 2822:3.6.2. + from_addr = (msg[header_prefix + 'Sender'] + if (header_prefix + 'Sender') in msg + else msg[header_prefix + 'From']) + if to_addrs is None: + addr_fields = [f for f in (msg[header_prefix + 'To'], + msg[header_prefix + 'Bcc'], + msg[header_prefix + 'Cc']) + if f is not None] + to_addrs = [a[1] for a in email.utils.getaddresses(addr_fields)] + # Make a local copy so we can delete the bcc headers. + msg_copy = copy.copy(msg) + del msg_copy['Bcc'] + del msg_copy['Resent-Bcc'] + international = False + try: + ''.join([from_addr, *to_addrs]).encode('ascii') + except UnicodeEncodeError: + if not self.has_extn('smtputf8'): + raise SMTPNotSupportedError( + "One or more source or delivery addresses require" + " internationalized email support, but the server" + " does not advertise the required SMTPUTF8 capability") + international = True + with io.BytesIO() as bytesmsg: + if international: + g = email.generator.BytesGenerator( + bytesmsg, policy=msg.policy.clone(utf8=True)) + mail_options += ['SMTPUTF8', 'BODY=8BITMIME'] + else: + g = email.generator.BytesGenerator(bytesmsg) + g.flatten(msg_copy, linesep='\r\n') + flatmsg = bytesmsg.getvalue() + return self.sendmail(from_addr, to_addrs, flatmsg, mail_options, + rcpt_options) + + def close(self): + """Close the connection to the SMTP server.""" + try: + file = self.file + self.file = None + if file: + file.close() + finally: + sock = self.sock + self.sock = None + if sock: + sock.close() + + def quit(self): + """Terminate the SMTP session.""" + res = self.docmd("quit") + # A new EHLO is required after reconnecting with connect() + self.ehlo_resp = self.helo_resp = None + self.esmtp_features = {} + self.does_esmtp = False + self.close() + return res + +if _have_ssl: + + class SMTP_SSL(SMTP): + """ This is a subclass derived from SMTP that connects over an SSL + encrypted socket (to use this class you need a socket module that was + compiled with SSL support). If host is not specified, '' (the local + host) is used. If port is omitted, the standard SMTP-over-SSL port + (465) is used. local_hostname and source_address have the same meaning + as they do in the SMTP class. keyfile and certfile are also optional - + they can contain a PEM formatted private key and certificate chain file + for the SSL connection. context also optional, can contain a + SSLContext, and is an alternative to keyfile and certfile; If it is + specified both keyfile and certfile must be None. + + """ + + default_port = SMTP_SSL_PORT + + def __init__(self, host='', port=0, local_hostname=None, + keyfile=None, certfile=None, + timeout=socket._GLOBAL_DEFAULT_TIMEOUT, + source_address=None, context=None): + if context is not None and keyfile is not None: + raise ValueError("context and keyfile arguments are mutually " + "exclusive") + if context is not None and certfile is not None: + raise ValueError("context and certfile arguments are mutually " + "exclusive") + if keyfile is not None or certfile is not None: + import warnings + warnings.warn("keyfile and certfile are deprecated, use a" + "custom context instead", DeprecationWarning, 2) + self.keyfile = keyfile + self.certfile = certfile + if context is None: + context = ssl._create_stdlib_context(certfile=certfile, + keyfile=keyfile) + self.context = context + SMTP.__init__(self, host, port, local_hostname, timeout, + source_address) + + def _get_socket(self, host, port, timeout): + if self.debuglevel > 0: + self._print_debug('connect:', (host, port)) + new_socket = socket.create_connection((host, port), timeout, + self.source_address) + new_socket = self.context.wrap_socket(new_socket, + server_hostname=self._host) + return new_socket + + __all__.append("SMTP_SSL") + +# +# LMTP extension +# +LMTP_PORT = 2003 + +class LMTP(SMTP): + """LMTP - Local Mail Transfer Protocol + + The LMTP protocol, which is very similar to ESMTP, is heavily based + on the standard SMTP client. It's common to use Unix sockets for + LMTP, so our connect() method must support that as well as a regular + host:port server. local_hostname and source_address have the same + meaning as they do in the SMTP class. To specify a Unix socket, + you must use an absolute path as the host, starting with a '/'. + + Authentication is supported, using the regular SMTP mechanism. When + using a Unix socket, LMTP generally don't support or require any + authentication, but your mileage might vary.""" + + ehlo_msg = "lhlo" + + def __init__(self, host='', port=LMTP_PORT, local_hostname=None, + source_address=None): + """Initialize a new instance.""" + SMTP.__init__(self, host, port, local_hostname=local_hostname, + source_address=source_address) + + def connect(self, host='localhost', port=0, source_address=None): + """Connect to the LMTP daemon, on either a Unix or a TCP socket.""" + if host[0] != '/': + return SMTP.connect(self, host, port, source_address=source_address) + + # Handle Unix-domain sockets. + try: + self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) + self.file = None + self.sock.connect(host) + except OSError: + if self.debuglevel > 0: + self._print_debug('connect fail:', host) + if self.sock: + self.sock.close() + self.sock = None + raise + (code, msg) = self.getreply() + if self.debuglevel > 0: + self._print_debug('connect:', msg) + return (code, msg) + + +# Test the sendmail method, which tests most of the others. +# Note: This always sends to localhost. +if __name__ == '__main__': + def prompt(prompt): + sys.stdout.write(prompt + ": ") + sys.stdout.flush() + return sys.stdin.readline().strip() + + fromaddr = prompt("From") + toaddrs = prompt("To").split(',') + print("Enter message, end with ^D:") + msg = '' + while 1: + line = sys.stdin.readline() + if not line: + break + msg = msg + line + print("Message length is %d" % len(msg)) + + server = SMTP('localhost') + server.set_debuglevel(1) + server.sendmail(fromaddr, toaddrs, msg) + server.quit() |