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|
=begin
= net/smtp.rb
Copyright (c) 1999-2003 Yukihiro Matsumoto
Copyright (c) 1999-2003 Minero Aoki
written & maintained by Minero Aoki <aamine@loveruby.net>
This program is free software. You can re-distribute and/or
modify this program under the same terms as Ruby itself,
Ruby Distribute License or GNU General Public License.
NOTE: You can find Japanese version of this document in
the doc/net directory of the standard ruby interpreter package.
$Id$
== What is This Module?
This module provides your program the functions to send internet
mail via SMTP, Simple Mail Transfer Protocol. For details of
SMTP itself, refer [RFC2821] ((<URL:http://www.ietf.org/rfc/rfc2821.txt>)).
== What is NOT This Module?
This module does NOT provide functions to compose internet mails.
You must create it by yourself. If you want better mail support,
try RubyMail or TMail. You can get both libraries from RAA.
((<URL:http://www.ruby-lang.org/en/raa.html>))
FYI: official documentation of internet mail is:
[RFC2822] ((<URL:http://www.ietf.org/rfc/rfc2822.txt>)).
== Examples
=== Sending Mail
You must open connection to SMTP server before sending mails.
First argument is the address of SMTP server, and second argument
is port number. Using SMTP.start with block is the most simple way
to do it. SMTP connection is closed automatically after block is
executed.
require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) {|smtp|
# use SMTP object only in this block
}
Replace 'your.smtp.server' by your SMTP server. Normally
your system manager or internet provider is supplying a server
for you.
Then you can send mail.
mail_text = <<END_OF_MAIL
From: Your Name <your@mail.address>
To: Dest Address <to@some.domain>
Subject: test mail
Date: Sat, 23 Jun 2001 16:26:43 +0900
Message-Id: <unique.message.id.string@some.domain>
This is test mail.
END_OF_MAIL
require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) {|smtp|
smtp.send_mail mail_text,
'your@mail.address',
'his_addess@example.com'
}
=== Closing Session
You MUST close SMTP session after sending mails, by calling #finish
method. You can also use block form of SMTP.start/SMTP#start, which
closes session automatically. I strongly recommend later one. It is
more beautiful and simple.
# using SMTP#finish
smtp = Net::SMTP.start('your.smtp.server', 25)
smtp.send_mail mail_string, 'from@address', 'to@address'
smtp.finish
# using block form of SMTP.start
Net::SMTP.start('your.smtp.server', 25) {|smtp|
smtp.send_mail mail_string, 'from@address', 'to@address'
}
=== Sending Mails From non-String Sources
In an example above I has sent mail from String (here document literal).
SMTP#send_mail accepts any objects which has "each" method
like File and Array.
require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) {|smtp|
File.open('Mail/draft/1') {|f|
smtp.send_mail f, 'your@mail.address', 'to@some.domain'
}
}
=== HELO domain
In almost all situation, you must designate the third argument
of SMTP.start/SMTP#start. It is the domain name which you are on
(the host to send mail from). It is called "HELO domain".
SMTP server will judge if he/she should send or reject
the SMTP session by inspecting HELO domain.
Net::SMTP.start( 'your.smtp.server', 25,
'mail.from.domain' ) {|smtp|
== class Net::SMTP
=== Class Methods
: new( address, port = 25 )
creates a new Net::SMTP object.
: start( address, port = 25, helo_domain = 'localhost.localdomain', account = nil, password = nil, authtype = nil )
: start( address, port = 25, helo_domain = 'localhost.localdomain', account = nil, password = nil, authtype = nil ) {|smtp| .... }
is equal to
Net::SMTP.new(address,port).start(helo_domain,account,password,authtype)
# example
Net::SMTP.start( 'your.smtp.server' ) {
smtp.send_mail mail_string, 'from@mail.address', 'dest@mail.address'
}
=== Instance Methods
: start( helo_domain = <local host name>, account = nil, password = nil, authtype = nil )
: start( helo_domain = <local host name>, account = nil, password = nil, authtype = nil ) {|smtp| .... }
opens TCP connection and starts SMTP session.
HELO_DOMAIN is a domain that you'll dispatch mails from.
If protocol had been started, raises IOError.
When this methods is called with block, give a SMTP object to block and
close session after block call finished.
If both of account and password are given, is trying to get
authentication by using AUTH command. :plain or :cram_md5 is
allowed for AUTHTYPE.
: started?
true if SMTP session is started.
: esmtp?
true if the SMTP object uses ESMTP.
: esmtp=(b)
set wheather SMTP should use ESMTP.
: address
the address to connect
: port
the port number to connect
: open_timeout
: open_timeout=(n)
seconds to wait until connection is opened.
If SMTP object cannot open a conection in this seconds,
it raises TimeoutError exception.
: read_timeout
: read_timeout=(n)
seconds to wait until reading one block (by one read(1) call).
If SMTP object cannot open a conection in this seconds,
it raises TimeoutError exception.
: finish
finishes SMTP session.
If SMTP session had not started, raises an IOError.
: send_mail( mailsrc, from_addr, *to_addrs )
This method sends MAILSRC as mail. A SMTP object read strings
from MAILSRC by calling "each" iterator, with converting them
into CRLF ("\r\n") terminated string when write.
FROM_ADDR must be a String, representing source mail address.
TO_ADDRS must be Strings or an Array of Strings, representing
destination mail addresses.
# example
Net::SMTP.start( 'your.smtp.server' ) {|smtp|
smtp.send_mail mail_string,
'from@mail.address',
'dest@mail.address' 'dest2@mail.address'
}
: ready( from_addr, *to_addrs ) {|adapter| .... }
This method stands by the SMTP object for sending mail and
gives adapter object to the block. ADAPTER has these 5 methods:
puts print printf write <<
FROM_ADDR must be a String, representing source mail address.
TO_ADDRS must be Strings or an Array of Strings, representing
destination mail addresses.
# example
Net::SMTP.start( 'your.smtp.server', 25 ) {|smtp|
smtp.ready( 'from@mail.addr', 'dest@mail.addr' ) {|f|
f.puts 'From: aamine@loveruby.net'
f.puts 'To: someone@somedomain.org'
f.puts 'Subject: test mail'
f.puts
f.puts 'This is test mail.'
}
}
== Exceptions
SMTP objects raise these exceptions:
: Net::ProtoSyntaxError
Syntax error (errno.500)
: Net::ProtoFatalError
Fatal error (errno.550)
: Net::ProtoUnknownError
Unknown error. (is probably bug)
: Net::ProtoServerBusy
Temporal error (errno.420/450)
=end
require 'net/protocol'
require 'digest/md5'
module Net
class SMTP < Protocol
Revision = %q$Revision$.split[1]
def SMTP.default_port
25
end
def initialize( address, port = nil )
@address = address
@port = port || SMTP.default_port
@esmtp = true
@command = nil
@socket = nil
@started = false
@open_timeout = 30
@read_timeout = 60
@debug_output = nil
end
def inspect
"#<#{self.class} #{address}:#{@port} open=#{@started}>"
end
def esmtp?
@esmtp
end
def esmtp=( bool )
@esmtp = bool
end
alias esmtp esmtp?
attr_reader :address
attr_reader :port
attr_accessor :open_timeout
attr_reader :read_timeout
def read_timeout=( sec )
@socket.read_timeout = sec if @socket
@read_timeout = sec
end
def set_debug_output( arg )
@debug_output = arg
end
#
# SMTP session control
#
def SMTP.start( address, port = nil,
helo = 'localhost.localdomain',
user = nil, secret = nil, authtype = nil,
&block)
new(address, port).start(helo, user, secret, authtype, &block)
end
def started?
@started
end
def start( helo = 'localhost.localdomain',
user = nil, secret = nil, authtype = nil )
raise IOError, 'SMTP session already started' if @started
if block_given?
begin
do_start(helo, user, secret, authtype)
return yield(self)
ensure
finish if @started
end
else
do_start(helo, user, secret, authtype)
return self
end
end
def do_start( helo, user, secret, authtype )
@socket = InternetMessageIO.open(@address, @port,
@open_timeout, @read_timeout,
@debug_output)
@command = SMTPCommand.new(@socket)
begin
if @esmtp
@command.ehlo helo
else
@command.helo helo
end
rescue ProtocolError
if @esmtp
@esmtp = false
@command = SMTPCommand.new(@socket)
retry
end
raise
end
if user or secret
raise ArgumentError, 'both of account and password are required'\
unless user and secret
mid = 'auth_' + (authtype || 'cram_md5').to_s
raise ArgumentError, "wrong auth type #{authtype}"\
unless command().respond_to?(mid)
@command.__send__ mid, user, secret
end
end
private :do_start
def finish
raise IOError, 'closing already closed SMTP session' unless @started
@command.quit if @command
@command = nil
@socket.close if @socket and not @socket.closed?
@socket = nil
@started = false
end
#
# SMTP wrapper
#
def send_mail( mailsrc, from_addr, *to_addrs )
do_ready from_addr, to_addrs.flatten
command().write_mail mailsrc
end
alias sendmail send_mail # backward compatibility
def ready( from_addr, *to_addrs, &block )
do_ready from_addr, to_addrs.flatten
command().through_mail(&block)
end
private
def do_ready( from_addr, to_addrs )
raise ArgumentError, 'mail destination does not given' if to_addrs.empty?
command().mailfrom from_addr
command().rcpt to_addrs
end
def command
raise IOError, "closed session" unless @command
@command
end
end
SMTPSession = SMTP
class SMTPCommand
def initialize( sock )
@socket = sock
@in_critical_block = false
check_response(critical { recv_response() })
end
def inspect
"#<#{self.class} socket=#{@socket.inspect}>"
end
def helo( domain )
getok('HELO %s', domain)
end
def ehlo( domain )
getok('EHLO %s', domain)
end
# "PLAIN" authentication [RFC2554]
def auth_plain( user, secret )
res = critical { get_response('AUTH PLAIN %s',
["\0#{user}\0#{secret}"].pack('m').chomp) }
raise SMTPAuthenticationError, res unless /\A2../ === res
end
# "CRAM-MD5" authentication [RFC2195]
def auth_cram_md5( user, secret )
res = nil
critical {
res = check_response(get_response('AUTH CRAM-MD5'), true)
challenge = res.split(/ /)[1].unpack('m')[0]
secret = Digest::MD5.digest(secret) if secret.size > 64
isecret = secret + "\0" * (64 - secret.size)
osecret = isecret.dup
0.upto(63) do |i|
isecret[i] ^= 0x36
osecret[i] ^= 0x5c
end
tmp = Digest::MD5.digest(isecret + challenge)
tmp = Digest::MD5.hexdigest(osecret + tmp)
res = get_response([user + ' ' + tmp].pack('m').gsub(/\s+/, ''))
}
raise SMTPAuthenticationError, res unless /\A2../ === res
end
def mailfrom( fromaddr )
getok('MAIL FROM:<%s>', fromaddr)
end
def rcpt( toaddrs )
toaddrs.each do |i|
getok('RCPT TO:<%s>', i)
end
end
def write_mail( src )
res = critical {
check_response(get_response('DATA'), true)
@socket.write_message src
recv_response()
}
check_response(res)
end
def through_mail( &block )
res = critical {
check_response(get_response('DATA'), true)
@socket.through_message(&block)
recv_response()
}
check_response(res)
end
def quit
getok('QUIT')
end
private
def getok( fmt, *args )
@socket.writeline sprintf(fmt, *args)
check_response(critical { recv_response() })
end
def get_response( fmt, *args )
@socket.writeline sprintf(fmt, *args)
recv_response()
end
def recv_response
res = ''
while true
line = @socket.readline
res << line << "\n"
break unless line[3] == ?- # "210-PIPELINING"
end
res
end
def check_response( res, cont = false )
etype = case res[0]
when ?2 then nil
when ?3 then cont ? nil : ProtoUnknownError
when ?4 then ProtoServerError
when ?5 then
case res[1]
when ?0 then ProtoSyntaxError
when ?3 then ProtoAuthError
when ?5 then ProtoFatalError
end
end
raise etype, res if etype
res
end
def critical
return if @in_critical_block
@in_critical_block = true
result = yield()
@in_critical_block = false
result
end
end
end # module Net
|