1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
# encoding: UTF-8
require 'ipaddr'
require 'socket'
#begin
# require 'locale'
#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
#
# Must have a `replace`. We supply a default, but it doesn't
# get used so if we want to use Sender outside of bin/mauvesend,
# we have to manually add it here with an explicit `false`.
# `nil` doesn't work.
update.replace ||= false
#
# 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.respond_to?(:encode)
value = value.encode("UTF-8", :undef => :replace, :invalid => :replace)
end
update.__send__("#{field.name}=", value)
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.respond_to?(:encode)
value = value.encode("UTF-8", :undef => :replace, :invalid => :replace)
end
alert.__send__("#{field.name}=", value)
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
|
