class Net::SMTP

What is This Library?

This library provides functionality to send internet mail via SMTP, the Simple Mail Transfer Protocol. For details of SMTP itself, see [RFC2821] (www.ietf.org/rfc/rfc2821.txt).

What is This Library NOT?

This library does NOT provide functions to compose internet mails. You must create them by yourself. If you want better mail support, try RubyMail or TMail or search for alternatives in RubyGems.org or The Ruby Toolbox.

FYI: the official documentation on internet mail is: [RFC2822] (www.ietf.org/rfc/rfc2822.txt).

Examples

Sending Messages

You must open a connection to an SMTP server before sending messages. The first argument is the address of your SMTP server, and the second argument is the port number. Using SMTP.start with a block is the simplest way to do this. This way, the SMTP connection is closed automatically after the block is executed.

require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  # Use the SMTP object smtp only in this block.
end

Replace ‘your.smtp.server’ with your SMTP server. Normally your system manager or internet provider supplies a server for you.

Then you can send messages.

msgstr = <<END_OF_MESSAGE
From: Your Name <your@mail.address>
To: Destination Address <someone@example.com>
Subject: test message
Date: Sat, 23 Jun 2001 16:26:43 +0900
Message-Id: <unique.message.id.string@example.com>

This is a test message.
END_OF_MESSAGE

require 'net/smtp'
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  smtp.send_message msgstr,
                    'your@mail.address',
                    'his_address@example.com'
end

Closing the Session

You MUST close the SMTP session after sending messages, by calling the finish method:

# using SMTP#finish
smtp = Net::SMTP.start('your.smtp.server', 25)
smtp.send_message msgstr, 'from@address', 'to@address'
smtp.finish

You can also use the block form of SMTP.start/SMTP#start. This closes the SMTP session automatically:

# using block form of SMTP.start
Net::SMTP.start('your.smtp.server', 25) do |smtp|
  smtp.send_message msgstr, 'from@address', 'to@address'
end

I strongly recommend this scheme. This form is simpler and more robust.

HELO domain

In almost all situations, you must provide a third argument to SMTP.start/SMTP#start. This is the domain name which you are on (the host to send mail from). It is called the “HELO domain”. The SMTP server will judge whether it should send or reject the SMTP session by inspecting the HELO domain.

Net::SMTP.start('your.smtp.server', 25
                helo: 'mail.from.domain') { |smtp| ... }

SMTP Authentication

The Net::SMTP class supports three authentication schemes; PLAIN, LOGIN and CRAM MD5. (SMTP Authentication: [RFC2554]) To use SMTP authentication, pass extra arguments to SMTP.start/SMTP#start.

# PLAIN
Net::SMTP.start('your.smtp.server', 25
                user: 'Your Account', secret: 'Your Password', authtype: :plain)
# LOGIN
Net::SMTP.start('your.smtp.server', 25
                user: 'Your Account', secret: 'Your Password', authtype: :login)

# CRAM MD5
Net::SMTP.start('your.smtp.server', 25
                user: 'Your Account', secret: 'Your Password', authtype: :cram_md5)

Constants

CRAM_BUFSIZE
DEFAULT_AUTH_TYPE

Authentication

IMASK
OMASK
Revision
VERSION

Attributes

address[R]

The address of the SMTP server to connect to.

capabilities[R]

The server capabilities by EHLO response

esmtp[RW]

Set whether to use ESMTP or not. This should be done before calling start. Note that if start is called in ESMTP mode, and the connection fails due to a ProtocolError, the SMTP object will automatically switch to plain SMTP mode and retry (but not vice versa).

esmtp?[RW]

Set whether to use ESMTP or not. This should be done before calling start. Note that if start is called in ESMTP mode, and the connection fails due to a ProtocolError, the SMTP object will automatically switch to plain SMTP mode and retry (but not vice versa).

open_timeout[RW]

Seconds to wait while attempting to open a connection. If the connection cannot be opened within this time, a Net::OpenTimeout is raised. The default value is 30 seconds.

port[R]

The port number of the SMTP server to connect to.

read_timeout[R]

Seconds to wait while reading one block (by one read(2) call). If the read(2) call does not complete within this time, a Net::ReadTimeout is raised. The default value is 60 seconds.

ssl_context_params[RW]

Hash for additional SSLContext parameters.

tls_hostname[RW]

The hostname for verifying hostname in the server certificatate.

tls_verify[RW]

If true, verify th server’s certificate.

Public Class Methods

default_port() click to toggle source

The default SMTP port number, 25.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 187
def SMTP.default_port
  25
end
default_ssl_context(ssl_context_params = nil) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 205
def SMTP.default_ssl_context(ssl_context_params = nil)
  context = OpenSSL::SSL::SSLContext.new
  context.set_params(ssl_context_params ? ssl_context_params : {})
  context
end
default_ssl_port()
Alias for: default_tls_port
default_submission_port() click to toggle source

The default mail submission port number, 587.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 192
def SMTP.default_submission_port
  587
end
default_tls_port() click to toggle source

The default SMTPS port number, 465.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 197
def SMTP.default_tls_port
  465
end
Also aliased as: default_ssl_port
new(address, port = nil, tls: false, starttls: :auto, tls_verify: true, tls_hostname: nil, ssl_context_params: nil) click to toggle source

Creates a new Net::SMTP object.

address is the hostname or ip address of your SMTP server. port is the port to connect to; it defaults to port 25.

If tls is true, enable TLS. The default is false. If starttls is :always, enable STARTTLS, if :auto, use STARTTLS when the server supports it, if false, disable STARTTLS.

If tls_verify is true, verify the server’s certificate. The default is true. If the hostname in the server certificate is different from address, it can be specified with tls_hostname.

Additional SSLContext params can be added to ssl_context_params hash argument and are passed to +OpenSSL::SSL::SSLContext#set_params+

+tls_verify: true+ is equivalent to +ssl_context_params: { verify_mode: OpenSSL::SSL::VERIFY_PEER }+. This method does not open the TCP connection. You can use SMTP.start instead of SMTP.new if you want to do everything at once. Otherwise, follow SMTP.new with SMTP#start.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 234
def initialize(address, port = nil, tls: false, starttls: :auto, tls_verify: true, tls_hostname: nil, ssl_context_params: nil)
  @address = address
  @port = (port || SMTP.default_port)
  @esmtp = true
  @capabilities = nil
  @socket = nil
  @started = false
  @open_timeout = 30
  @read_timeout = 60
  @error_occurred = false
  @debug_output = nil
  @tls = tls
  @starttls = starttls
  @ssl_context_tls = nil
  @ssl_context_starttls = nil
  @tls_verify = tls_verify
  @tls_hostname = tls_hostname
  @ssl_context_params = ssl_context_params
end
start(address, port = nil, helo: 'localhost', user: nil, secret: nil, authtype: nil, tls: false, starttls: :auto, tls_verify: true, tls_hostname: nil, ssl_context_params: nil) { |smtp| ... } click to toggle source
start(address, port = nil, helo = 'localhost', user = nil, secret = nil, authtype = nil) { |smtp| ... }

Creates a new Net::SMTP object and connects to the server.

This method is equivalent to:

Net::SMTP.new(address, port).start(helo: helo_domain, user: account, secret: password, authtype: authtype, tls_verify: flag, tls_hostname: hostname, ssl_context_params: nil)

Example

Net::SMTP.start('your.smtp.server') do |smtp|
  smtp.send_message msgstr, 'from@example.com', ['dest@example.com']
end

Block Usage

If called with a block, the newly-opened Net::SMTP object is yielded to the block, and automatically closed when the block finishes. If called without a block, the newly-opened Net::SMTP object is returned to the caller, and it is the caller’s responsibility to close it when finished.

Parameters

address is the hostname or ip address of your smtp server.

port is the port to connect to; it defaults to port 25.

helo is the HELO domain provided by the client to the server (see overview comments); it defaults to ‘localhost’.

The remaining arguments are used for SMTP authentication, if required or desired. user is the account name; secret is your password or other authentication token; and authtype is the authentication type, one of :plain, :login, or :cram_md5. See the discussion of SMTP Authentication in the overview notes.

If tls is true, enable TLS. The default is false. If starttls is :always, enable STARTTLS, if :auto, use STARTTLS when the server supports it, if false, disable STARTTLS.

If tls_verify is true, verify the server’s certificate. The default is true. If the hostname in the server certificate is different from address, it can be specified with tls_hostname.

Additional SSLContext params can be added to ssl_context_params hash argument and are passed to +OpenSSL::SSL::SSLContext#set_params+

+tls_verify: true+ is equivalent to +ssl_context_params: { verify_mode: OpenSSL::SSL::VERIFY_PEER }+.

Errors

This method may raise:

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 511
def SMTP.start(address, port = nil, *args, helo: nil,
               user: nil, secret: nil, password: nil, authtype: nil,
               tls: false, starttls: :auto,
               tls_verify: true, tls_hostname: nil, ssl_context_params: nil,
               &block)
  raise ArgumentError, "wrong number of arguments (given #{args.size + 2}, expected 1..6)" if args.size > 4
  helo ||= args[0] || 'localhost'
  user ||= args[1]
  secret ||= password || args[2]
  authtype ||= args[3]
  new(address, port, tls: tls, starttls: starttls, tls_verify: tls_verify, tls_hostname: tls_hostname, ssl_context_params: ssl_context_params).start(helo: helo, user: user, secret: secret, authtype: authtype, &block)
end

Public Instance Methods

auth_cram_md5(user, secret) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 843
def auth_cram_md5(user, secret)
  check_auth_args user, secret
  res = critical {
    res0 = get_response('AUTH CRAM-MD5')
    check_auth_continue res0
    crammed = cram_md5_response(secret, res0.cram_md5_challenge)
    get_response(base64_encode("#{user} #{crammed}"))
  }
  check_auth_response res
  res
end
auth_login(user, secret) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 832
def auth_login(user, secret)
  check_auth_args user, secret
  res = critical {
    check_auth_continue get_response('AUTH LOGIN')
    check_auth_continue get_response(base64_encode(user))
    get_response(base64_encode(secret))
  }
  check_auth_response res
  res
end
auth_plain(user, secret) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 823
def auth_plain(user, secret)
  check_auth_args user, secret
  res = critical {
    get_response('AUTH PLAIN ' + base64_encode("\0#{user}\0#{secret}"))
  }
  check_auth_response res
  res
end
authenticate(user, secret, authtype = DEFAULT_AUTH_TYPE) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 817
def authenticate(user, secret, authtype = DEFAULT_AUTH_TYPE)
  check_auth_method authtype
  check_auth_args user, secret
  public_send auth_method(authtype), user, secret
end
capable?(key) click to toggle source

true if the EHLO response contains key.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 287
def capable?(key)
  return nil unless @capabilities
  @capabilities[key] ? true : false
end
capable_auth_types() click to toggle source

Returns supported authentication methods on this server. You cannot get valid value before opening SMTP session.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 322
def capable_auth_types
  return [] unless @capabilities
  return [] unless @capabilities['AUTH']
  @capabilities['AUTH']
end
capable_cram_md5_auth?() click to toggle source

true if server advertises AUTH CRAM-MD5. You cannot get valid value before opening SMTP session.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 309
def capable_cram_md5_auth?
  auth_capable?('CRAM-MD5')
end
capable_login_auth?() click to toggle source

true if server advertises AUTH LOGIN. You cannot get valid value before opening SMTP session.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 303
def capable_login_auth?
  auth_capable?('LOGIN')
end
capable_plain_auth?() click to toggle source

true if server advertises AUTH PLAIN. You cannot get valid value before opening SMTP session.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 297
def capable_plain_auth?
  auth_capable?('PLAIN')
end
capable_starttls?() click to toggle source

true if server advertises STARTTLS. You cannot get valid value before opening SMTP session.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 282
def capable_starttls?
  capable?('STARTTLS')
end
data(msgstr = nil) { |stream| ... } click to toggle source

This method sends a message. If msgstr is given, sends it as a message. If block is given, yield a message writer stream. You must write message before the block is closed.

# Example 1 (by string)
smtp.data(<<EndMessage)
From: john@example.com
To: betty@example.com
Subject: I found a bug

Check vm.c:58879.
EndMessage

# Example 2 (by block)
smtp.data {|f|
  f.puts "From: john@example.com"
  f.puts "To: betty@example.com"
  f.puts "Subject: I found a bug"
  f.puts ""
  f.puts "Check vm.c:58879."
}
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 981
def data(msgstr = nil, &block)   #:yield: stream
  if msgstr and block
    raise ArgumentError, "message and block are exclusive"
  end
  unless msgstr or block
    raise ArgumentError, "message or block is required"
  end
  res = critical {
    check_continue get_response('DATA')
    socket_sync_bak = @socket.io.sync
    begin
      @socket.io.sync = false
      if msgstr
        @socket.write_message msgstr
      else
        @socket.write_message_by_block(&block)
      end
    ensure
      @socket.io.flush
      @socket.io.sync = socket_sync_bak
    end
    recv_response()
  }
  check_response res
  res
end
debug_output=(arg) click to toggle source

WARNING: This method causes serious security holes. Use this method for only debugging.

Set an output stream for debug logging. You must call this before start.

# example
smtp = Net::SMTP.new(addr, port)
smtp.set_debug_output $stderr
smtp.start do |smtp|
  ....
end
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 435
def debug_output=(arg)
  @debug_output = arg
end
Also aliased as: set_debug_output
disable_ssl()
Alias for: disable_tls
disable_starttls() click to toggle source

Disables SMTP/TLS (STARTTLS) for this object. Must be called before the connection is established to have any effect.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 393
def disable_starttls
  @starttls = false
  @ssl_context_starttls = nil
end
disable_tls() click to toggle source

Disables SMTP/TLS for this object. Must be called before the connection is established to have any effect.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 349
def disable_tls
  @tls = false
  @ssl_context_tls = nil
end
Also aliased as: disable_ssl
ehlo(domain) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 921
def ehlo(domain)
  getok("EHLO #{domain}")
end
enable_ssl(context = nil)
Alias for: enable_tls
enable_starttls(context = nil) click to toggle source

Enables SMTP/TLS (STARTTLS) for this object. context is a OpenSSL::SSL::SSLContext object.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 375
def enable_starttls(context = nil)
  raise 'openssl library not installed' unless defined?(OpenSSL::VERSION)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @tls
  @starttls = :always
  @ssl_context_starttls = context
end
enable_starttls_auto(context = nil) click to toggle source

Enables SMTP/TLS (STARTTLS) for this object if server accepts. context is a OpenSSL::SSL::SSLContext object.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 384
def enable_starttls_auto(context = nil)
  raise 'openssl library not installed' unless defined?(OpenSSL::VERSION)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @tls
  @starttls = :auto
  @ssl_context_starttls = context
end
enable_tls(context = nil) click to toggle source

Enables SMTP/TLS (SMTPS: SMTP over direct TLS connection) for this object. Must be called before the connection is established to have any effect. context is a OpenSSL::SSL::SSLContext object.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 338
def enable_tls(context = nil)
  raise 'openssl library not installed' unless defined?(OpenSSL::VERSION)
  raise ArgumentError, "SMTPS and STARTTLS is exclusive" if @starttls == :always
  @tls = true
  @ssl_context_tls = context
end
Also aliased as: enable_ssl
finish() click to toggle source

Finishes the SMTP session and closes TCP connection. Raises IOError if not started.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 617
def finish
  raise IOError, 'not yet started' unless started?
  do_finish
end
helo(domain) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 917
def helo(domain)
  getok("HELO #{domain}")
end
inspect() click to toggle source

Provide human-readable stringification of class state.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 264
def inspect
  "#<#{self.class} #{@address}:#{@port} started=#{@started}>"
end
mailfrom(from_addr) click to toggle source

from_addr is String or Net::SMTP::Address

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 926
def mailfrom(from_addr)
  addr = Address.new(from_addr)
  getok((["MAIL FROM:<#{addr.address}>"] + addr.parameters).join(' '))
end
open_message_stream(from_addr, *to_addrs) { |stream| ... } click to toggle source

Opens a message writer stream and gives it to the block. The stream is valid only in the block, and has these methods:

puts(str = ”)

outputs STR and CR LF.

print(str)

outputs STR.

printf(fmt, *args)

outputs sprintf(fmt,*args).

write(str)

outputs STR and returns the length of written bytes.

<<(str)

outputs STR and returns self.

If a single CR (“r”) or LF (“n”) is found in the message, it is converted to the CR LF pair. You cannot send a binary message with this method.

Parameters

from_addr is a String or Net::SMTP::Address representing the source mail address.

to_addr is a String or Net::SMTP::Address or Array of them, representing the destination mail address or addresses.

Example

Net::SMTP.start('smtp.example.com', 25) do |smtp|
  smtp.open_message_stream('from@example.com', ['dest@example.com']) do |f|
    f.puts 'From: from@example.com'
    f.puts 'To: dest@example.com'
    f.puts 'Subject: test message'
    f.puts
    f.puts 'This is a test message.'
  end
end

Errors

This method may raise:

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 801
def open_message_stream(from_addr, *to_addrs, &block)   # :yield: stream
  raise IOError, 'closed session' unless @socket
  mailfrom from_addr
  rcptto_list(to_addrs) {data(&block)}
end
Also aliased as: ready
quit() click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1008
def quit
  getok('QUIT')
end
rcptto(to_addr) click to toggle source

to_addr is String or Net::SMTP::Address

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 953
def rcptto(to_addr)
  addr = Address.new(to_addr)
  getok((["RCPT TO:<#{addr.address}>"] + addr.parameters).join(' '))
end
rcptto_list(to_addrs) { || ... } click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 931
def rcptto_list(to_addrs)
  raise ArgumentError, 'mail destination not given' if to_addrs.empty?
  ok_users = []
  unknown_users = []
  to_addrs.flatten.each do |addr|
    begin
      rcptto addr
    rescue SMTPAuthenticationError
      unknown_users << addr.to_s.dump
    else
      ok_users << addr
    end
  end
  raise ArgumentError, 'mail destination not given' if ok_users.empty?
  ret = yield
  unless unknown_users.empty?
    raise SMTPAuthenticationError, "failed to deliver for #{unknown_users.join(', ')}"
  end
  ret
end
read_timeout=(sec) click to toggle source

Set the number of seconds to wait until timing-out a read(2) call.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 416
def read_timeout=(sec)
  @socket.read_timeout = sec if @socket
  @read_timeout = sec
end
ready(from_addr, *to_addrs)
Alias for: open_message_stream
rset() click to toggle source

Aborts the current mail transaction

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 909
def rset
  getok('RSET')
end
send_mail(msgstr, from_addr, *to_addrs)
Alias for: send_message
send_message(msgstr, from_addr, *to_addrs) click to toggle source

Sends msgstr as a message. Single CR (“r”) and LF (“n”) found in the msgstr, are converted into the CR LF pair. You cannot send a binary message with this method. msgstr should include both the message headers and body.

from_addr is a String or Net::SMTP::Address representing the source mail address.

to_addr is a String or Net::SMTP::Address or Array of them, representing the destination mail address or addresses.

Example

Net::SMTP.start('smtp.example.com') do |smtp|
  smtp.send_message msgstr,
                    'from@example.com',
                    ['dest@example.com', 'dest2@example.com']
end

Net::SMTP.start('smtp.example.com') do |smtp|
  smtp.send_message msgstr,
                    Net::SMTP::Address.new('from@example.com', size: 12345),
                    Net::SMTP::Address.new('dest@example.com', notify: :success)
end

Errors

This method may raise:

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 748
def send_message(msgstr, from_addr, *to_addrs)
  raise IOError, 'closed session' unless @socket
  mailfrom from_addr
  rcptto_list(to_addrs) {data msgstr}
end
Also aliased as: send_mail, sendmail
sendmail(msgstr, from_addr, *to_addrs)
Alias for: send_message
set_debug_output(arg)
Alias for: debug_output=
ssl?()
Alias for: tls?
start(helo: 'localhost', user: nil, secret: nil, authtype: nil) { |smtp| ... } click to toggle source
start(helo = 'localhost', user = nil, secret = nil, authtype = nil) { |smtp| ... }

Opens a TCP connection and starts the SMTP session.

Parameters

helo is the HELO domain that you’ll dispatch mails from; see the discussion in the overview notes.

If both of user and secret are given, SMTP authentication will be attempted using the AUTH command. authtype specifies the type of authentication to attempt; it must be one of :login, :plain, and :cram_md5. See the notes on SMTP Authentication in the overview.

Block Usage

When this methods is called with a block, the newly-started SMTP object is yielded to the block, and automatically closed after the block call finishes. Otherwise, it is the caller’s responsibility to close the session when finished.

Example

This is very similar to the class method SMTP.start.

require 'net/smtp'
smtp = Net::SMTP.new('smtp.mail.server', 25)
smtp.start(helo: helo_domain, user: account, secret: password, authtype: authtype) do |smtp|
  smtp.send_message msgstr, 'from@example.com', ['dest@example.com']
end

The primary use of this method (as opposed to SMTP.start) is probably to set debugging (set_debug_output) or ESMTP (esmtp=), which must be done before the session is started.

Errors

If session has already been started, an IOError will be raised.

This method may raise:

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 584
def start(*args, helo: nil, user: nil, secret: nil, password: nil, authtype: nil)
  raise ArgumentError, "wrong number of arguments (given #{args.size}, expected 0..4)" if args.size > 4
  helo ||= args[0] || 'localhost'
  user ||= args[1]
  secret ||= password || args[2]
  authtype ||= args[3]
  if defined?(OpenSSL::VERSION)
    ssl_context_params = @ssl_context_params || {}
    unless ssl_context_params.has_key?(:verify_mode)
      ssl_context_params[:verify_mode] = @tls_verify ? OpenSSL::SSL::VERIFY_PEER : OpenSSL::SSL::VERIFY_NONE
    end
    if @tls && @ssl_context_tls.nil?
      @ssl_context_tls = SMTP.default_ssl_context(ssl_context_params)
    end
    if @starttls && @ssl_context_starttls.nil?
      @ssl_context_starttls = SMTP.default_ssl_context(ssl_context_params)
    end
  end
  if block_given?
    begin
      do_start helo, user, secret, authtype
      return yield(self)
    ensure
      do_finish
    end
  else
    do_start helo, user, secret, authtype
    return self
  end
end
started?() click to toggle source

true if the SMTP session has been started.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 525
def started?
  @started
end
starttls() click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 913
def starttls
  getok('STARTTLS')
end
starttls?() click to toggle source

Returns truth value if this object uses STARTTLS. If this object always uses STARTTLS, returns :always. If this object uses STARTTLS when the server support TLS, returns :auto.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 359
def starttls?
  @starttls
end
starttls_always?() click to toggle source

true if this object uses STARTTLS.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 364
def starttls_always?
  @starttls == :always
end
starttls_auto?() click to toggle source

true if this object uses STARTTLS when server advertises STARTTLS.

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 369
def starttls_auto?
  @starttls == :auto
end
tls?() click to toggle source

true if this object uses SMTP/TLS (SMTPS).

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 329
def tls?
  @tls
end
Also aliased as: ssl?

Private Instance Methods

auth_capable?(type) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 313
def auth_capable?(type)
  return nil unless @capabilities
  return false unless @capabilities['AUTH']
  @capabilities['AUTH'].include?(type)
end
auth_method(type) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 863
def auth_method(type)
  "auth_#{type.to_s.downcase}".intern
end
base64_encode(str) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 876
def base64_encode(str)
  # expects "str" may not become too long
  [str].pack('m0')
end
check_auth_args(user, secret, authtype = DEFAULT_AUTH_TYPE) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 867
def check_auth_args(user, secret, authtype = DEFAULT_AUTH_TYPE)
  unless user
    raise ArgumentError, 'SMTP-AUTH requested but missing user name'
  end
  unless secret
    raise ArgumentError, 'SMTP-AUTH requested but missing secret phrase'
  end
end
check_auth_continue(res) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1075
def check_auth_continue(res)
  unless res.continue?
    raise res.exception_class.new(res)
  end
end
check_auth_method(type) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 857
def check_auth_method(type)
  unless respond_to?(auth_method(type), true)
    raise ArgumentError, "wrong authentication type #{type}"
  end
end
check_auth_response(res) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1069
def check_auth_response(res)
  unless res.success?
    raise SMTPAuthenticationError.new(res)
  end
end
check_continue(res) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1063
def check_continue(res)
  unless res.continue?
    raise SMTPUnknownError.new(res, message: "could not get 3xx (#{res.status}: #{res.string})")
  end
end
check_response(res) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1057
def check_response(res)
  unless res.success?
    raise res.exception_class.new(res)
  end
end
cram_md5_response(secret, challenge) click to toggle source

CRAM-MD5: [RFC2195]

# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 885
def cram_md5_response(secret, challenge)
  tmp = Digest::MD5.digest(cram_secret(secret, IMASK) + challenge)
  Digest::MD5.hexdigest(cram_secret(secret, OMASK) + tmp)
end
cram_secret(secret, mask) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 892
def cram_secret(secret, mask)
  secret = Digest::MD5.digest(secret) if secret.size > CRAM_BUFSIZE
  buf = secret.ljust(CRAM_BUFSIZE, "\0")
  0.upto(buf.size - 1) do |i|
    buf[i] = (buf[i].ord ^ mask).chr
  end
  buf
end
critical() { || ... } click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1047
def critical
  return Response.parse('200 dummy reply code') if @error_occurred
  begin
    return yield()
  rescue Exception
    @error_occurred = true
    raise
  end
end
do_finish() click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 697
def do_finish
  quit if @socket and not @socket.closed? and not @error_occurred
ensure
  @started = false
  @error_occurred = false
  @socket.close if @socket
  @socket = nil
end
do_helo(helo_domain) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 685
def do_helo(helo_domain)
  res = @esmtp ? ehlo(helo_domain) : helo(helo_domain)
  @capabilities = res.capabilities
rescue SMTPError
  if @esmtp
    @esmtp = false
    @error_occurred = false
    retry
  end
  raise
end
do_start(helo_domain, user, secret, authtype) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 633
def do_start(helo_domain, user, secret, authtype)
  raise IOError, 'SMTP session already started' if @started
  if user or secret
    check_auth_method(authtype || DEFAULT_AUTH_TYPE)
    check_auth_args user, secret
  end
  s = tcp_socket(@address, @port)
  logging "Connection opened: #{@address}:#{@port}"
  @socket = new_internet_message_io(tls? ? tlsconnect(s, @ssl_context_tls) : s)
  check_response critical { recv_response() }
  do_helo helo_domain
  if ! tls? and (starttls_always? or (capable_starttls? and starttls_auto?))
    unless capable_starttls?
      raise SMTPUnsupportedCommand.new(nil, message: "STARTTLS is not supported on this server")
    end
    starttls
    @socket = new_internet_message_io(tlsconnect(s, @ssl_context_starttls))
    # helo response may be different after STARTTLS
    do_helo helo_domain
  end
  authenticate user, secret, (authtype || DEFAULT_AUTH_TYPE) if user
  @started = true
ensure
  unless @started
    # authentication failed, cancel connection.
    s.close if s
    @socket = nil
  end
end
get_response(reqline) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1031
def get_response(reqline)
  validate_line reqline
  @socket.writeline reqline
  recv_response()
end
getok(reqline) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1021
def getok(reqline)
  validate_line reqline
  res = critical {
    @socket.writeline reqline
    recv_response()
  }
  check_response res
  res
end
logging(msg) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1160
def logging(msg)
  @debug_output << msg + "\n" if @debug_output
end
new_internet_message_io(s) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 680
def new_internet_message_io(s)
  InternetMessageIO.new(s, read_timeout: @read_timeout,
                        debug_output: @debug_output)
end
recv_response() click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1037
def recv_response
  buf = ''.dup
  while true
    line = @socket.readline
    buf << line << "\n"
    break unless line[3,1] == '-'   # "210-PIPELINING"
  end
  Response.parse(buf)
end
ssl_socket(socket, context) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 663
def ssl_socket(socket, context)
  OpenSSL::SSL::SSLSocket.new socket, context
end
tcp_socket(address, port) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 624
def tcp_socket(address, port)
  begin
    Socket.tcp address, port, nil, nil, connect_timeout: @open_timeout
  rescue Errno::ETIMEDOUT #raise Net:OpenTimeout instead for compatibility with previous versions
    raise Net::OpenTimeout, "Timeout to open TCP connection to "\
      "#{address}:#{port} (exceeds #{@open_timeout} seconds)"
  end
end
tlsconnect(s, context) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 667
def tlsconnect(s, context)
  verified = false
  s = ssl_socket(s, context)
  logging "TLS connection started"
  s.sync_close = true
  s.hostname = @tls_hostname || @address
  ssl_socket_connect(s, @open_timeout)
  verified = true
  s
ensure
  s.close unless verified
end
validate_line(line) click to toggle source
# File net-smtp-0.3.1.1/lib/net/smtp.rb, line 1014
def validate_line(line)
  # A bare CR or LF is not allowed in RFC5321.
  if /[\r\n]/ =~ line
    raise ArgumentError, "A line must not contain CR or LF"
  end
end