Module: Sisimai::Lhost::DragonFly

Defined in:
lib/sisimai/lhost/dragonfly.rb

Overview

Sisimai::Lhost::DragonFly decodes a bounce email which created by DMA: DragonFly Mail Agent www.dragonflybsd.org/handbook/mta/. Methods in the module are called from only Sisimai::Message.

Constant Summary collapse

Indicators = 
Sisimai::Lhost.INDICATORS
Boundaries = 
['Original message follows.', 'Message headers follow'].freeze
StartingOf = 
{
  # https://github.com/corecode/dma/blob/ffad280aa40c242aa9a2cb9ca5b1b6e8efedd17e/mail.c#L84
  message: ['This is the DragonFly Mail Agent '],
}.freeze

Class Method Summary collapse

Class Method Details

.description ⇒ Object 



80
 
# File 'lib/sisimai/lhost/dragonfly.rb', line 80

def description; return 'DragonFly'; end

.inquire(mhead, mbody) ⇒ Hash, Nil

This method is abstract.

Decodes the bounce message from DMA: DragonFly Mail Agent

Parameters:

  • mhead (Hash) —

    Message headers of a bounce email

  • mbody (String) —

    Message body of a bounce email

Returns:

  • (Hash) —

    Bounce data list and message/rfc822 part

  • (Nil) —

    it failed to decode or the arguments are missing



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# File 'lib/sisimai/lhost/dragonfly.rb', line 23

def inquire(mhead, mbody)
  return nil if mhead['subject'].start_with?('Mail delivery failed') == false
  return nil if mhead['received'].none? { |a| a.include?(' (DragonFly Mail Agent') }

  dscontents = [Sisimai::Lhost.DELIVERYSTATUS]; v = nil
  emailparts = Sisimai::RFC5322.part(mbody, Boundaries)
  bodyslices = emailparts[0].split("\n")
  readcursor = 0      # (Integer) Points the current cursor position
  recipients = 0      # (Integer) The number of 'Final-Recipient' header

  while e = bodyslices.shift do
    # Read error messages and delivery status lines from the head of the email to the previous
    # line of the beginning of the original message.
    if readcursor == 0
      # Beginning of the bounce message or delivery status part
      readcursor |= Indicators[:deliverystatus] if e.start_with?(StartingOf[:message][0])
      next
    end
    next if (readcursor & Indicators[:deliverystatus]) == 0 || e.empty?

    # This is the DragonFly Mail Agent v0.13 at df.example.jp.
    #
    # There was an error delivering your mail to <kijitora@example.com>.
    #
    # email.example.jp [192.0.2.25] did not like our RCPT TO:
    # 552 5.2.2 <kijitora@example.com>: Recipient address rejected: Mailbox full
    #
    # Original message follows.
    v = dscontents[-1]

    if e.start_with?('There was an error delivering your mail to <')
      # email.example.jp [192.0.2.25] did not like our RCPT TO:
      # 552 5.2.2 <kijitora@example.com>: Recipient address rejected: Mailbox full
      if v["recipient"] != ""
        # There are multiple recipient addresses in the message body.
        dscontents << Sisimai::Lhost.DELIVERYSTATUS
        v = dscontents[-1]
      end
      v['recipient'] = Sisimai::Address.find(e, false)[0][:address]
      recipients += 1
    else
      # Pick the error message
      v['diagnosis'] += " #{e}"

      # Pick the remote hostname, and the SMTP command
      # net.c:500| snprintf(errmsg, sizeof(errmsg), "%s [%s] did not like our %s:\n%s",
      next if e.include?(' did not like our ') == false
      next if v['rhost'] != ""

      p = e.split(' ', 3)
      v['rhost']   = if p[0].include?('.') then p[0] else p[1] end
      v['command'] = Sisimai::SMTP::Command.find(e)
    end
  end
  return nil if recipients == 0
  return { 'ds' => dscontents, 'rfc822' => emailparts[1] }
end