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#!/usr/bin/env ruby
#--
# Copyright (C) 2002 Matt Armstrong. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote
# products derived from this software without specific prior
# written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
# GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
# IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#++
# This script delivers a mail message taken from stdin to a mail
# queue, and then starts the mail filter program if it isn't already
# running.
#
# === Usage
#
# deliver.rb is invoked from the command line using:
#
# % deliver.rb <options>
#
# Options are:
#
# <tt>--load-path</tt>:: Prepend the given directory to ruby's
# load path.
#
# <tt>--log</tt> <i>filename</i>:: Log to the given <i>filename</i>. If no
# log is specified, no logging occurs.
#
# <tt>--home</tt> <i>directory</i>:: Specify the home <i>directory</i>.
# rdeliver will change to this directory
# before reading and writing any files.
# The home directory defaults to
# the value of the +HOME+ or +LOGDIR+
# environment variable.
# === Installation
#
# Assuming you have the RubyMail mail classes installed, you typically
# have to put something like this in your .forward file:
#
# |"/usr/local/bin/deliver.rb --log /home/you/.rlog"
#
# This will call rdeliver for each new message you get, and log to
# <tt>/home/you/.rlog</tt>.
#
# === Catastrophic Errors
#
# The deliver.rb script is very careful with errors. If there is any
# problem, it logs the error to the log file you specify. But if you
# do not specify a log file, or the error occurs before the log file
# is opened, a record of the error is placed in a file called
# CATASTROPHIC_DELIVERY_FAILURE in the home directory. If that fails,
# the error information is printed to the standard output in the hopes
# that it will be part of a bounce message. In all cases, the exit
# code 75 is returned, which tells the MTA to re-try the delivery
# again.
def print_exception(file, exception) # :nodoc:
file.puts("Exception:\n " +
exception.inspect + "\n")
file.puts "Backtrace:\n"
exception.backtrace.each { |line|
file.puts " " + line + "\n"
}
end
def filter_pid(queue_dir)
pid = nil
begin
File::open("Maildir/.filterpid") { |file|
if Time.now - file.stat.mtime < (60 * 60 * 4)
pid_str = file.gets.chomp.strip
if pid_str =~ /^\d+/
pid = Integer(pid_str)
end
end
}
rescue Errno::ENOENT
end
return pid
end
def run_filter
# FIXME: this is useful only for me. Hmm...
exec("/home/matt/pkg/bin/ruby-cvs",
'-I', '/home/matt/bk/live/rubyfilter',
'-I', '/home/matt/bk/live/rubymail',
"/home/matt/bk/live/rubyfilter/bin/filter.rb")
end
# Try to get to home dir, in preparation for possibly writing
# CATASTROPHIC_DELIVERY_FAILURE
not_in_home_dir_exception = nil
begin
Dir.chdir
rescue Exception
not_in_home_dir_exception = $!
end
begin
$SAFE = 1
require 'getoptlong'
parser = GetoptLong.new\
(['--load-path', '-I', GetoptLong::REQUIRED_ARGUMENT],
['--log', '-l', GetoptLong::REQUIRED_ARGUMENT],
['--home', '-h', GetoptLong::REQUIRED_ARGUMENT])
parser.quiet = true
log = nil
parser.each_option do |name, arg|
case name
when '--home'
Dir.chdir(arg.untaint)
not_in_home_dir_exception = nil
when '--log'
log = arg.untaint
when '--load-path'
$LOAD_PATH.unshift(arg.untaint)
else
raise "don't know about argument #{name}"
end
end
raise "extra arguments passed to #{$0}: #{ARGV.inspect}" unless ARGV.empty?
require 'rfilter/deliver'
include RFilter::Deliver
queue = "Maildir"
deliver_maildir(queue, $stdin)
fork {
Process.setsid()
File.umask(077)
devnull = open('/dev/null', 'r+')
# errors = open('/tmp/errors', 'w')
$stdin.reopen(devnull)
# $stdout.reopen(errors)
# $stderr.reopen(errors)
$stdout.reopen(devnull)
$stderr.reopen(devnull)
run_filter
exit!
}
exit(0)
rescue Exception => exception
if exception.class <= SystemExit
raise exception # normal exit
else
# Be nice and stick the last delivery failure due to a catastrophic
# situation in home/CATASTROPHIC_DELIVERY_FAILURE
begin
unless not_in_home_dir_exception.nil?
raise not_in_home_dir_exception
end
File.open("CATASTROPHIC_DELIVERY_FAILURE", "w") { |file|
print_exception(file, exception)
file.puts "LOAD_PATH"
file.puts $LOAD_PATH.inspect
}
rescue Exception => another_exception
# In the event that the above doesn't happen, we write the error
# to stdout and hope the mailer includes it in the bounce that
# will eventually occur.
print_exception(STDOUT, exception)
puts "Failed writing CATASTROPHIC_DELIVERY_FAILURE because:"
print_exception(STDOUT, another_exception)
ensure
exit 75 # EX_TMPFAIL
end
end
end
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