cpython/Lib/smtplib.py

459 lines
15 KiB
Python
Executable File

#! /usr/bin/env python
'''SMTP/ESMTP client class.
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.
This was modified from the Python 1.5 library HTTP lib.
This should follow RFC 821 (SMTP) and RFC 1869 (ESMTP).
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()
'''
import socket
import string
import re
import rfc822
import types
SMTP_PORT = 25
CRLF="\r\n"
# used for exceptions
class SMTPException(Exception): pass
class SMTPServerDisconnected(SMTPException): pass
class SMTPSenderRefused(SMTPException): pass
class SMTPRecipientsRefused(SMTPException): pass
class SMTPDataError(SMTPException): pass
def quoteaddr(addr):
"""Quote a subset of the email addresses defined by RFC 821.
Should be able to handle anything rfc822.parseaddr can handle.
"""
m=None
try:
m=rfc822.parseaddr(addr)[1]
except AttributeError:
pass
if not m:
#something weird here.. punt -ddm
return addr
else:
return "<%s>" % m
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))
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 responce to the
most recent HELO command.
ehlo_resp
This is the message given by the server in responce 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 extentions this server supports, and their
parameters (if any).
Note, all extention names are mapped to lower case in the
dictionary.
For method docs, see each method's docstrings. In general, there is
a method of the same name to perform each SMTP command, and there
is a method called 'sendmail' that will do an entire mail
transaction.
"""
debuglevel = 0
file = None
helo_resp = None
ehlo_resp = None
does_esmtp = 0
def __init__(self, host = '', port = 0):
"""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.
"""
self.esmtp_features = {}
if host: self.connect(host, port)
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 connect(self, host='localhost', port = 0):
"""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 not port:
i = string.find(host, ':')
if i >= 0:
host, port = host[:i], host[i+1:]
try: port = string.atoi(port)
except string.atoi_error:
raise socket.error, "nonnumeric port"
if not port: port = SMTP_PORT
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
if self.debuglevel > 0: print 'connect:', (host, port)
self.sock.connect(host, port)
(code,msg)=self.getreply()
if self.debuglevel >0 : print "connect:", msg
return msg
def send(self, str):
"""Send `str' to the server."""
if self.debuglevel > 0: print 'send:', `str`
if self.sock:
try:
self.sock.send(str)
except socket.error:
raise SMTPServerDisconnected('Server not connected')
else:
raise SMTPServerDisconnected('please run connect() first')
def putcmd(self, cmd, args=""):
"""Send a command to the server."""
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:
line = self.file.readline()
if line == '':
self.close()
raise SMTPServerDisconnected("Connection unexpectedly closed")
if self.debuglevel > 0: print 'reply:', `line`
resp.append(string.strip(line[4:]))
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 = string.atoi(code)
except ValueError:
errcode = -1
break
# Check if multiline response.
if line[3:4]!="-":
break
errmsg = string.join(resp,"\n")
if self.debuglevel > 0:
print 'reply: retcode (%s); Msg: %s' % (errcode,errmsg)
return errcode, errmsg
def docmd(self, cmd, args=""):
"""Send a command, and return its response code."""
self.putcmd(cmd,args)
(code,msg)=self.getreply()
return code
# std smtp commands
def helo(self, name=''):
"""SMTP 'helo' command.
Hostname to send for this command defaults to the FQDN of the local
host.
"""
name=string.strip(name)
if len(name)==0:
name=socket.gethostbyaddr(socket.gethostname())[0]
self.putcmd("helo",name)
(code,msg)=self.getreply()
self.helo_resp=msg
return code
def ehlo(self, name=''):
""" SMTP 'ehlo' command.
Hostname to send for this command defaults to the FQDN of the local
host.
"""
name=string.strip(name)
if len(name)==0:
name=socket.gethostbyaddr(socket.gethostname())[0]
self.putcmd("ehlo",name)
(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:
raise SMTPServerDisconnected("Server not connected")
self.ehlo_resp=msg
if code<>250:
return code
self.does_esmtp=1
#parse the ehlo responce -ddm
resp=string.split(self.ehlo_resp,'\n')
del resp[0]
for each in resp:
m=re.match(r'(?P<feature>[A-Za-z0-9][A-Za-z0-9\-]*)',each)
if m:
feature=string.lower(m.group("feature"))
params=string.strip(m.string[m.end("feature"):])
self.esmtp_features[feature]=params
return code
def has_extn(self, opt):
"""Does the server support a given SMTP service extension?"""
return self.esmtp_features.has_key(string.lower(opt))
def help(self, args=''):
"""SMTP 'help' command.
Returns help text from server."""
self.putcmd("help", args)
(code,msg)=self.getreply()
return msg
def rset(self):
"""SMTP 'rset' command -- resets session."""
code=self.docmd("rset")
return code
def noop(self):
"""SMTP 'noop' command -- doesn't do anything :>"""
code=self.docmd("noop")
return code
def mail(self,sender,options=[]):
"""SMTP 'mail' command -- begins mail xfer session."""
optionlist = ''
if options and self.does_esmtp:
optionlist = string.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 = ' ' + string.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.
"""
self.putcmd("data")
(code,repl)=self.getreply()
if self.debuglevel >0 : print "data:", (code,repl)
if code <> 354:
return -1
else:
self.send(quotedata(msg))
self.send("%s.%s" % (CRLF, CRLF))
(code,msg)=self.getreply()
if self.debuglevel >0 : print "data:", (code,msg)
return code
def verify(self, address):
"""SMTP 'verify' command -- checks for address validity."""
self.putcmd("vrfy", quoteaddr(address))
return self.getreply()
# a.k.a.
vrfy=verify
def expn(self, address):
"""SMTP 'verify' command -- checks for address validity."""
self.putcmd("expn", quoteaddr(address))
return self.getreply()
# some useful methods
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.
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. Otherwise it will throw an exception (either
SMTPSenderRefused, SMTPRecipientsRefused, or SMTPDataError) That is,
if this method does not throw an exception, then someone should get
your mail. If this method does not throw an exception, it returns a
dictionary, with one entry for each recipient that was refused.
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.
"""
if not self.helo_resp and not self.ehlo_resp:
if self.ehlo() >= 400:
self.helo()
esmtp_opts = []
if self.does_esmtp:
# Hmmm? what's this? -ddm
# self.esmtp_features['7bit']=""
if self.has_extn('size'):
esmtp_opts.append("size=" + `len(msg)`)
for option in mail_options:
esmtp_opts.append(option)
(code,resp) = self.mail(from_addr, esmtp_opts)
if code <> 250:
self.rset()
raise SMTPSenderRefused('%s: %s' % (from_addr, resp))
senderrs={}
if type(to_addrs) == types.StringType:
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 len(senderrs)==len(to_addrs):
# the server refused all our recipients
self.rset()
raise SMTPRecipientsRefused(string.join(
map(lambda x:"%s: %s" % (x[0], x[1][1]), senderrs.items()),
'; '))
code=self.data(msg)
if code <>250 :
self.rset()
raise SMTPDataError('data transmission error: %s' % code)
#if we got here then somebody got our mail
return senderrs
def close(self):
"""Close the connection to the SMTP server."""
if self.file:
self.file.close()
self.file = None
if self.sock:
self.sock.close()
self.sock = None
def quit(self):
"""Terminate the SMTP session."""
self.docmd("quit")
self.close()
# Test the sendmail method, which tests most of the others.
# Note: This always sends to localhost.
if __name__ == '__main__':
import sys, rfc822
def prompt(prompt):
sys.stdout.write(prompt + ": ")
return string.strip(sys.stdin.readline())
fromaddr = prompt("From")
toaddrs = string.splitfields(prompt("To"), ',')
print "Enter message, end with ^D:"
msg = ''
while 1:
line = sys.stdin.readline()
if not line:
break
msg = msg + line
print "Message length is " + `len(msg)`
server = SMTP('localhost')
server.set_debuglevel(1)
server.sendmail(fromaddr, toaddrs, msg)
server.quit()