Module: Sisimai::RFC1123

Defined in:
lib/sisimai/rfc1123.rb

Overview

Sisimai::RFC1123 is a class related to the Internet host

Constant Summary collapse

Sandwiched = 
[
    # (Postfix) postfix/src/smtp/smtp_proto.c: "host %s said: %s (in reply to %s)",
    # - <kijitora@example.com>: host re2.example.com[198.51.100.2] said: 550 ...
    # - <kijitora@example.org>: host r2.example.org[198.51.100.18] refused to talk to me:
    ["host ", " said: "],
    ["host ", " talk to me: "],
    ["while talking to ", ":"], # (Sendmail) ... while talking to mx.bouncehammer.jp.:
    ["host ", " ["],            # (Exim) host mx.example.jp [192.0.2.20]: 550 5.7.0 
    [" by ", ". ["],            # (Gmail) ...for the recipient domain example.jp by mx.example.jp. [192.0.2.1].

    # (MailFoundry)
    # - Delivery failed for the following reason: Server mx22.example.org[192.0.2.222] failed with: 550...
    # - Delivery failed for the following reason: mail.example.org[192.0.2.222] responded with failure: 552..
    ["delivery failed for the following reason: ", " with"],
    ["remote system: ", "("],   # (MessagingServer) Remote system: dns;mx.example.net (mx. -- 
    ["smtp server <", ">"],     # (X6) SMTP Server <smtpd.libsisimai.org> rejected recipient ...
    ["-mta: ", ">"],            # (MailMarshal) Reporting-MTA:      <rr1.example.com>
    [" : ", "["],               # (SendGrid) cat:000000:<cat@example.jp> : 192.0.2.1 : mx.example.jp:[192.0.2.2]...
].freeze
StartAfter = 
[
    "generating server: ",      # (Exchange2007) en-US/Generating server: mta4.example.org
    "serveur de g",             # (Exchange2007) fr-FR/Serveur de g辿?辿?ation
    "server di generazione",    # (Exchange2007) it-CH
    "genererande server",       # (Exchange2007) sv-SE
].freeze
ExistUntil = 
[
    " did not like our ",       # (Dragonfly) mail-inbound.libsisimai.net [192.0.2.25] did not like our DATA: ...
].freeze

Class Method Summary collapse

Class Method Details

.find(argv1 = "") ⇒ Object

find() returns a valid internet hostname found from the argument

Parameters:

  • string —

    argv1 String including hostnames

Returns:

  • string A valid internet hostname found in the argument

Since:

  • v5.2.0



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# File 'lib/sisimai/rfc1123.rb', line 113

def find(argv1 = "")
  return "" if argv1.nil? || argv1.size < 5

  sourcetext = argv1.downcase
  sourcelist = []
  foundtoken = []
  thelongest = 0
  hostnameis = ""

  # Replace some string for splitting by " "
  # - mx.example.net[192.0.2.1] => mx.example.net [192.0.2.1]
  # - mx.example.jp:[192.0.2.1] => mx.example.jp :[192.0.2.1]
  sourcetext = sourcetext.gsub("[", " [").gsub("(", " (").gsub("<", " <") # Prefix a space character before each bracket
  sourcetext = sourcetext.gsub("]", "] ").gsub(")", ") ").gsub(">", "> ") # Suffix a space character behind each bracket
  sourcetext = sourcetext.gsub(":", ": ").gsub(";", "; ")                 # Suffix a space character behind : and ;
  sourcetext = sourcetext.split.join(" ")

  catch :MAKELIST do
    Sandwiched.each do |e|
      # Check a hostname exists between the $e->[0] and $e->[1] at array "Sandwiched"
      # Each array in Sandwiched have 2 elements
      next if Sisimai::String.aligned(sourcetext, e) == false

      p1 = sourcetext.index(e[0])
      p2 = sourcetext.index(e[1])
      cw = e[0].size
      next if p1 + cw >= p2

      sourcelist = sourcetext[p1 + cw, p2 - cw - p1].split(" ")
      throw :MAKELIST
    end

    # Check other patterns which are not sandwiched
    StartAfter.each do |e|
      # StartAfter have some strings, not an array
      p1 = sourcetext.index(e); next if p1.nil?
      cw = e.size
      sourcelist = sourcetext[p1 + cw, sourcetext.size].split(" ")
      throw :MAKELIST
    end
    ExistUntil.each do |e|
      # ExistUntil have some strings, not an array
      p1 = sourcetext.index(e); next if p1.nil?
      sourcelist = sourcetext[0, p1].split(" ")
      throw :MAKELIST
    end

    sourcelist = sourcetext.split(" ") if sourcelist.size == 0
    throw :MAKELIST
  end

  sourcelist.each do |e|
    # Pick some strings which is 4 or more length, is including "." character
    e.chop! if e[-1, 1] == "." # Remove "." at the end of the string
    e.delete!('[]()<>:;')

    next if e.size < 4
    next if e.include?(".") == false
    next if Sisimai::RFC1123.is_internethost(e) == false
    foundtoken << e
  end
  return ""            if foundtoken.size == 0
  return foundtoken[0] if foundtoken.size == 1

  foundtoken.each do |e|
    # Returns the longest hostname
    cw = e.size; next if thelongest >= cw
    hostnameis = e
    thelongest = cw
  end
  return hostnameis
end

.is_domainliteral(email) ⇒ Boolean

returns true if the domain part is [IPv4:…] or [IPv6:…].

Parameters:

  • email (String) —

    Email address.

Returns:

  • (Boolean) —

    false: the domain part is not a domain literal. true: the domain part is a domain literal.



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# File 'lib/sisimai/rfc1123.rb', line 70

def is_domainliteral(email)
  return false if email.is_a?(::String) == false

  email = email.delete_prefix('<').delete_suffix('>')
  return false if email.size < 16 # e@[IPv4:0.0.0.0] is 16 characters
  return false if email[-1, 1] != ']'

  lastb = email.rindex('@[IPv'); return false if lastb == false
  dpart = email.split('@')[-1]

  if email.include?('@[IPv4:')
    # neko@[IPv4:192.0.2.25]
    ipv4a = email[lastb + 7, 16].delete_suffix(']')
    return Sisimai::RFC791.is_ipv4address(ipv4a)

  elsif email.include?('@[IPv6:')
    # neko@[IPv6:2001:0DB8:0000:0000:0000:0000:0000:0001]
    # neko@[IPv6:2001:0DB8:0000:0000:0000:0000:0000:0001]
    # IPv6-address-literal  = "IPv6:" IPv6-addr
    #    IPv6-addr      = IPv6-full / IPv6-comp / IPv6v4-full / IPv6v4-comp
    #    IPv6-hex       = 1*4HEXDIG
    #    IPv6-full      = IPv6-hex 7(":" IPv6-hex)
    #    IPv6-comp      = [IPv6-hex *5(":" IPv6-hex)] "::"
    #                     [IPv6-hex *5(":" IPv6-hex)]
    #                     ; The "::" represents at least 2 16-bit groups of
    #                     ; zeros.  No more than 6 groups in addition to the
    #                     ; "::" may be present.
    #    IPv6v4-full    = IPv6-hex 5(":" IPv6-hex) ":" IPv4-address-literal
    #    IPv6v4-comp    = [IPv6-hex *3(":" IPv6-hex)] "::"
    #                     [IPv6-hex *3(":" IPv6-hex) ":"]
    #                     IPv4-address-literal
    #                     ; The "::" represents at least 2 16-bit groups of
    #                     ; zeros.  No more than 4 groups in addition to the
    #                     ; "::" and IPv4-address-literal may be present.
    return true if dpart.size > 2 && dpart.rindex(':') > 7
  end
  return false
end

.is_internethost(argv0 = '') ⇒ Boolean

Returns “true” when the given string is a valid internet host

Parameters:

  • argv0 (String) (defaults to: '') —

    Hostname

Returns:

  • (Boolean) —

    false: is not a valid internet host, true: is a valid interneet host

Since:

  • v5.2.0



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# File 'lib/sisimai/rfc1123.rb', line 40

def is_internethost(argv0 = '')
  return false if argv0.nil? || argv0.size < 4 || argv0.size > 255
  return true  if argv0 == 'localhost' || argv0 == 'localhost6'
  return false if argv0.include?(".") == false
  return false if argv0.include?("..") || argv0.include?("--")
  return false if argv0.start_with?(".", "-") || argv0.end_with?("-")

  characters = argv0.upcase.split("")
  characters.each do |e|
    # Check each characater is a number or an alphabet
    f = e.ord
    return false if f <  45             # 45 = '-'
    return false if f == 47             # 47 = '/'
    return false if f >  57 && f <  65  # 57 = '9', 65 = 'A'
    return false if f >  90             # 90 = 'Z'
  end

  p1 = argv0.rindex(".")
  cv = argv0[p1 + 1, argv0.size - p1]; return false if cv.size > 63
  cv.split("").each do |e|
    # The top level domain should not include a number
    f = e.ord; return false if f > 47 && f < 58
  end
  return true
end