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# encoding: UTF-8
require 'ipaddr'
require 'socket'
begin
require 'locale'
rescue LoadError
# Do nothing -- these are bonus libraries :)
end
begin
require 'iconv' unless String.new.respond_to?(:encode)
rescue LoadError
# Do nothing -- these are bonus libraries :)
end
require 'mauve/mauve_resolv'
require 'mauve/mauve_time'
require 'mauve/proto'
module Mauve
#
# This is the class that send the Mauve packets.
#
class Sender
#
# This is the default mauve receiving port.
#
DEFAULT_PORT = 32741
include Resolv::DNS::Resource::IN
# Set up a new sender. It takes a list of destinations and uses DNS to
# resolve names to addresses.
#
# A destination can look like
#
# 1.2.3.4:5678
# 1.2.3.4
# [2001:1af:ba8::dead]:5678
# [2001:1af:ba8::dead]
# mauve.host:5678
# mauve.host
#
# If no port is specified, DEFAULT_PORT is used.
#
# If a hostname is used, SRV records are used, with the prefix
# +_mauvealert._udp+ to determine the real hostname and port to which
# alerts should be sent.
#
# Otherwise AAAA and A records are looked up.
#
# @param [Array] destinations List of destinations to which the update is to be sent.
#
def initialize(*destinations)
destinations = destinations.flatten
destinations = begin
File.read("/etc/mauvealert/mauvesend.destination").split(/\s+/)
rescue Errno::ENOENT => notfound
[]
end if destinations.empty?
if !destinations || destinations.empty?
raise ArgumentError.new("No destinations specified, and could not read any destinations from /etc/mauvealert/mauvesend.destination")
end
#
# Resolv results
#
results = []
destinations.each do |spec|
case spec
when /^((?:\d{1,3}\.){3}\d{1,3})(?::(\d+))?$/
#
# IPv4 with a port
#
results << [$1, $2 || DEFAULT_PORT]
when /^\[([0-9a-f:\.]{2,39})\](?::(\d+))?$/i
#
# IPv6 with a port
#
results << [$1, $2 || DEFAULT_PORT]
when /^([^: ]+)(?::(\d+))?/
domain = $1
#
# If no port is specified, set it to the default, and also try to
# use SRV records.
#
if $2.nil?
port = DEFAULT_PORT
use_srv = true
else
port = $2
use_srv = false
end
list = []
Resolv::DNS.open do |dns|
if use_srv
#
# Search for SRV records first. If the first character of the
# domain is an underscore, assume that it is a SRV record
#
srv_domain = (domain[0] == ?_ ? domain : "_mauvealert._udp.#{domain}")
list += dns.getresources(srv_domain, SRV).map do |srv|
[srv.target.to_s, srv.port]
end
end
end
#
# If nothing found, just use the domain and port
#
list = [[domain, port]] if list.empty?
list.each do |d,p|
r = []
#
# This gets both AAAA and A records
#
Mauve::MauveResolv.get_ips_for(d).each do |a|
r << [a, p]
end
results += r unless r.empty?
end
end ## case
end ## each
#
# Validate results.
#
@destinations = []
results.each do |ip, port|
ip = IPAddr.new(ip)
@destinations << [ip, port.to_i]
end
end
# Sanitise all fields in an update, such that when we send, they are
# normal.
#
#
def sanitize(update)
#
# Must have a source, so default to hostname if user doesn't care
update.source ||= Socket.gethostname
#
# Check the locale charset. This is to maximise the amout of information
# mauve receives, rather than provide proper sanitized data for the server.
#
from_charset = (Locale.current.charset || Locale.charset) if defined?(Locale)
from_charset ||= "UTF-8"
#
#
#
update.each_field do |field, value|
#
# Make sure all string fields are UTF8 -- to ensure the maximal amount of information is sent.
#
if value.is_a?(String)
if value.respond_to?(:encode)
value = value.encode("UTF-8", :undef => :replace, :invalid => :replace)
elsif defined? Iconv
value = Iconv.conv("UTF-8//IGNORE", from_charset, value)
end
update.__send__("#{field.name}=", value)
end
end
update.alert.each do |alert|
#
# Make sure all alerts default to "-r now"
#
alert.raise_time = Time.now.to_i unless (alert.raise_time > 0 or alert.clear_time > 0)
alert.each_field do |field, value|
#
# Make sure all string fields are UTF8 -- to ensure the maximal amount of information is sent.
#
if value.is_a?(String)
if value.respond_to?(:encode)
value = value.encode("UTF-8", :undef => :replace, :invalid => :replace)
elsif defined? Iconv
value = Iconv.conv("UTF-8//IGNORE", from_charset, value)
end
alert.__send__("#{field.name}=", value)
end
end
end
#
# Make sure we set the transmission time and ID.
#
update.transmission_time = Time.now.to_i if update.transmission_time.nil? or update.transmission_time == 0
update.transmission_id = rand(2**63) if update.transmission_id.nil? or update.transmission_id == 0
update
end
# Send an update.
#
# @param [Mauve::Proto] update The update to send
# @param [Integer] vebose The verbosity -- higher is more.
#
# @return [Integer] the number of packets sent.
def send(update, verbose=0)
#
# Clean up the update, and set any missing fields.
#
update = sanitize(update)
data = sanitize(update).serialize_to_string
if verbose == 1
summary = "#{update.transmission_id} from #{update.source}"
elsif verbose >= 2
summary = update.inspect.split("\n").join(" ")
end
if verbose > 0
puts "Sending #{summary} to #{@destinations.collect{|i,p| (i.ipv6? ? "[#{i}]" : i.to_s )+":#{p}"}.join(", ")}"
end
#
# Keep a count of the number of alerts sent.
#
sent = 0
@destinations.each do |ip, port|
begin
UDPSocket.open(ip.family).send(data, 0, ip.to_s, port)
sent += 1
rescue Errno::ENETUNREACH => ex
# Catch and ignore unreachable network errors.
warn "Got #{ex.to_s} whilst trying to send to "+(ip.ipv6? ? "[#{ip}]" : ip.to_s )+":#{port}" if verbose > 0
end
end
raise "Failed to send any packets to any destinations!" unless sent > 0
sent
end
end
end
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