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# encoding: UTF-8
require 'ipaddr'
require 'resolv'
require 'socket'
require 'mauve/mauve_time'
require 'pp'
module Mauve
class Sender
DEFAULT_PORT = 32741
include Resolv::DNS::Resource::IN
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
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
#
# If nothing found, just use the domain and port
#
list = [[domain, port]] if list.empty?
list.each do |d,p|
r = []
#
# Try IPv6 first.
#
dns.getresources(d, AAAA).map do |a|
r << [a.address.to_s, p]
end
#
# Try IPv4 too.
#
dns.getresources(d, A).each do |a|
r << [a.address.to_s, p]
end
results += r unless r.empty?
end
end
end
end
#
# Validate results.
#
@destinations = []
results.each do |ip, port|
ip = IPAddr.new(ip)
@destinations << [ip, port.to_i]
end
end
#
# Returns the number of packets sent.
#
def send(update, verbose=0)
#
# Must have a source, so default to hostname if user doesn't care
update.source ||= `hostname -f`.chomp
#
# Make sure all alerts default to "-r now"
#
update.alert.each do |alert|
next if alert.raise_time || alert.clear_time
alert.raise_time = MauveTime.now.to_i
end
#
# Make sure we set the transmission time
#
update.transmission_time = MauveTime.now.to_i
data = 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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