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#!/usr/bin/ruby -Ku

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#--
# CyborgHood, a distributed system management software.
# Copyright (c) 2009 Marc Dequènes (Duck) <Duck@DuckCorp.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#++

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# to allow in-place run for test
$: << File.join(File.dirname(__FILE__), "..", "lib")
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#require 'socket'
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require 'tempfile'
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require 'shellwords'
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require 'cyborghood/imap'
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require 'cyborghood/mail'
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require 'cyborghood/mail_order'
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require 'cyborghood/objects'
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require 'cyborghood/services/dns'
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#Socket.gethostname

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module CyborgHood
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module PostmanHome
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include GetText
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bindtextdomain("cyborghood_postman", {:path => Config::L10N_DIR, :charset => "UTF-8"})
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# not yet ready to be a real Cyborg
class Postman #< Cyborg
include GetText
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def initialize
# load config
Config.load(self.human_name.downcase)
@config = Config.instance
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ldap_config = @config.ldap
ldap_config.logger = logger
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ActiveLdap::Base.setup_connection(ldap_config.marshal_dump)
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# setup logs
unless @config.log.nil?
logger.output_level(@config.log.console_level) unless @config.log.console_level.nil?
logger.log_to_file(@config.log.file) unless @config.log.file.nil?
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end
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@current_thread = Thread.current
@stop_asap = false
@waiting = false

logger.info "Bot '#{self.human_name}' loaded"
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end

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def run
imap = IMAP.new(@config.imap)
until @stop_asap
t = Time.now.to_i
logger.debug "Starting mail check"
check_mails(imap)
logger.debug "Mail check finished"
t2 = Time.now.to_i
sleep_time = @config.imap.min_check_interval - (t2 - t)
if sleep_time > 0
logger.debug "Having a break before new check..."
@waiting = true
begin
sleep(sleep_time)
rescue
end
@waiting = false
end
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end
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logger.info "Bot was asked to stop..." if @stop_asap
logger.info "Bot terminating"
end
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def ask_to_stop
@stop_asap = true
Thread.critical = true
@current_thread.raise if @waiting
Thread.critical = false
end

private

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def check_mails(imap)
imap.check_mail do |msg|
if @stop_asap
logger.info "Bot was asked to stop..."
break
end
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mail = Mail.new(msg.content)
logger.info "Received mail with ID '#{mail.message_id}': #{mail.from_addrs} -> #{mail.to_addrs} (#{mail.subject})"
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# ignore mails not signed or encrypted
unless mail.is_pgp_signed? or mail.is_pgp_encrypted?
logger.info "Mail not signed/encrypted or not RFC3156 compliant, ignoring..."
msg.delete
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next
end
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logger.debug "RFC3156 content detected"
begin
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report = mail.process
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rescue CyberError => e
case e.severity
when :dangerous
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logger.fatal "Fatal processing error, exiting (#{e.message})"
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exit 2
when :unrecoverable
logger.error "Internal processing error, skipping mail (#{e.message})"
next
when :ignorable
end
end
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result_tag = report.ok? ? "SUCCESS" : "FAILURE"
logger.info "Processing result: #{result_tag} (#{report.error})"

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i18n = I18n.instance
i18n.set_language_for_user(report.user)
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unless report.ok?
if report.warn_sender
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logger.info "Sending reply for rejected message"
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intro = report.user ? sprintf(_("Hello %s,"), report.user.cn) : _("Hello,")
mail_reply = mail.create_simple_reject_reply(intro + "\n\n" + sprintf(
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_("A message (ID: %s), apparently from you, was rejected for the following reason:"),
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mail.message_id) + "\n " + _(report.error) + "\n" + mail_signature())
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mail_reply.deliver
end
msg.delete
next
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end

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order = MailOrder.parse(report.user, report.message)
result_tag = order.valid? ? "SUCCESS" : "FAILURE"
logger.info "Processing result: #{result_tag} (#{order.error})"

unless order.valid?
logger.info "Sending reply for rejected order"
mail_reply = mail.create_simple_reject_reply(sprintf(_("Hello %s,"), order.user.cn) + "\n\n" +
sprintf(_("An order, in a message (ID: %s) from you, was rejected for the following reason:"),
mail.message_id) + "\n " + _(order.error) + "\n" + mail_signature())
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mail_reply.sign_and_crypt(order.user.keyFingerPrint)
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mail_reply.deliver
msg.delete
next
end

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logger.debug "Message accepted, processing orders..."
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result_list = CommandRunner.run(order)
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# create transcript
logger.debug "Preparing reply"
reply_txt = sprintf(_("Hello %s,"), order.user.cn) + "\n\n"
reply_txt += _("Follows the transcript of your commands:") + "\n"
reply_attachments = []
result_list.each do |result|
reply_txt << "> #{result.cmd}\n"
reply_txt << "#{result.message}\n"
reply_attachments += result.refs unless result.refs.nil?
end
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reply_txt << mail_signature()
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# create mail
logger.debug "Preparing mail"
mail_reply = mail.create_reply
if reply_attachments.empty?
transcript_part = mail_reply
else
mail_reply.set_content_type("multipart", "mixed", {'boundary' => TMail.new_boundary})
parts = []
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p = CyborgHood::Mail.new
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transcript_part = p
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mail_reply.parts << p
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reply_attachments.each do |attachment|
p = CyborgHood::Mail.new
p.set_content_type("text", "plain", {'charset' => "utf-8"})
p.set_disposition("attachment", {'filename' => attachment.filename})
p.quoted_printable_body = attachment.content
mail_reply.parts << p
end
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end
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# insert transcript
transcript_part.set_content_type("text", "plain", {'charset' => 'utf-8', 'format' => 'flowed'})
transcript_part.set_disposition("inline")
transcript_part.quoted_printable_body = reply_txt

# send reply
logger.debug "Sending mail"
mail_reply.sign_and_crypt(order.user.keyFingerPrint)
mail_reply.deliver

logger.info "Message processed completely, deleting"
msg.delete
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end
end

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def mail_signature
s = "\n" +
"-- \n" +
"#{CyborgHood::PRODUCT} v#{CyborgHood::VERSION}\n"
s += _("Contact eMail:") + " \"#{@config.contact.name}\" <#{@config.contact.email}>\n" if @config.contact.email
s += _("Contact URL:") + " #{@config.contact.url}\n" if @config.contact.url
s
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end
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end

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class CommandRunner
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include GetText

def self.run(order)
result_list = []
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order.commands.each do |cmd|
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if cmd.valid?
logger.info "Executing command: #{cmd.cmdline}"
begin
result = execute_cmd(order.user, cmd.cmdsplit, order.shared_parameters)
if result.nil?
result = OpenStruct.new
result.cmd = cmd.cmdline
result.ok = false
result.message = _("Command not recognized.")
result.refs = nil
end
rescue CyberError => e
result = OpenStruct.new
result.cmd = cmd.cmdline
result.ok = false
result.message = e.message.capitalize + "."
result.refs = nil
rescue
logger.warn "Command crashed: " + $!
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result = OpenStruct.new
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result.cmd = cmd.cmdline
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result.ok = false
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result.message = _("Internal error. Administrator is warned.")
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result.refs = nil
end
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tag = result.ok ? "SUCCESS" :"FAILURE"
logger.debug "Command result: [#{tag}] #{result.message}"
else
logger.info "Detected invalid command: #{cmd.cmdline}"
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result = OpenStruct.new
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result.cmd = cmd.cmdline
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result.ok = false
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result.message = cmd.parsing_errors.collect{|err| _(err) }.join("\n")
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result.refs = nil
end
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result_list << result
end
result_list
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end
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private
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def self.execute_cmd(user, cmdline, shared_parameters)
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subsys = cmdline.shift
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result = OpenStruct.new
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result.cmd = cmdline
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result.ok = false
ok = true
case subsys.upcase
when "DNS"
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return if cmdline.empty?
case cmdline.shift.upcase
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when "INFO"
return unless cmdline.empty?
list = CyborgHood::DnsDomain.find_by_manager(user)
txt_list = list.collect{|z| z.cn }.sort.join(", ")
result.ok = true
result.message = sprintf(_("You are manager of the following zones: %s."), txt_list)
when "GET"
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return if cmdline.empty?
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case cmdline.shift.upcase
when "ZONE"
return if cmdline.empty?
zone = cmdline.shift.downcase

dom = CyborgHood::DnsDomain.new(zone)
unless dom.hosted?
result.message = ("This zone is not hosted here.")
return result
end
unless dom.managed_by? user
result.message = _("You are not allowed to manage this zone.")
return result
end

srv_dns = CyborgHood::Services::DNS.new(zone)
result.ok = true
result.message = _("Requested zone content attached.")
zone_ref = {:content => srv_dns.read_zone, :filename => "dnszone_#{zone}.txt"}.to_ostruct
result.refs = [zone_ref]
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end
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when "SET"
return if cmdline.empty?
case cmdline.shift.upcase
when "ZONE"
return if cmdline.empty?
zone = cmdline.shift.downcase
dom = CyborgHood::DnsDomain.new(zone)
unless dom.hosted?
result.message = _("This zone is not hosted here.")
return result
end
unless dom.managed_by? user
result.message = _("You are not allowed to manage this zone.")
return result
end
srv_dns = CyborgHood::Services::DNS.new(zone)

return if cmdline.empty?
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content_ref = cmdline.shift
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part = shared_parameters[content_ref]
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unless part.type == "text/plain"
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result.message = _("Attachment has wrong content-type.")
return result
end
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f = Tempfile.new(zone)
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f.write(part.content)
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f.close
logger.debug "Created temporary zone file '#{f.path}'"
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srv_dns = CyborgHood::Services::DNS.new(zone)
current_serial = srv_dns.serial
logger.debug "Current serial: #{current_serial}"
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dns_result = srv_dns.check_zone_file(f.path)
unless dns_result.ok
result.message = _("Invalid zone data.")
f.close!
return result
end
logger.debug "New serial: #{dns_result.serial}"
# allow new serial or missing serial (to allow creating a new zone or replacing a broken zone)
unless current_serial.nil? or dns_result.serial > current_serial
result.message = _("Zone serial is not superior to current serial.")
f.close!
return result
end
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begin
srv_dns.write_zone_from_file(f.path)
logger.debug "zone changed"
if srv_dns.reload_zone
logger.debug "zone reloaded"
result.ok = true
result.message = _("Zone updated.")
else
logger.warn "zone reload failed, replacing old content"
srv_dns.replace_zone_with_backup
result.message = _("Internal error. Administrator is warned.")
end
rescue
logger.warn "Writing zone file failed"
raise
ensure
f.close!
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end
end
end
end
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if result.message.nil?
# here fall lost souls
nil
else
result
end
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end
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end
end
end

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bot = CyborgHood::PostmanHome::Postman.new
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trap('INT') do
bot.ask_to_stop
end
trap('TERM') do
bot.ask_to_stop
end

bot.run