blob: 2a0c705b037b6d11c3755e580b8eddae1b443aa2 (
plain)
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
|
require 'custodian/settings'
require 'ipaddr'
require 'socket'
require 'timeout'
#
# This class is responsible for doing forward/reverse DNS lookups
#
module Custodian
module Util
class DNS
#
# Return the reverse DNS for the specified IP address, nil on failure.
#
def DNS.ip_to_hostname( ip )
resolved = nil
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
begin
timeout( period ) do
begin
resolved = Socket.getnameinfo(Socket.sockaddr_in(80, ip) ).first
rescue SocketError
resolved = nil
end
end
rescue Timeout::Error => e
resolved = nil
end
resolved
end
#
# Convert a hostname to an IP address, return nil on failure.
#
def DNS.hostname_to_ip( hostname )
resolved = nil
#
# Get the timeout period.
#
settings = Custodian::Settings.instance
period = settings.timeout
begin
timeout( period ) do
begin
Socket.getaddrinfo(hostname, 'echo').each do |a|
resolved = a[3] if a
end
rescue SocketError
resolved = nil
end
end
rescue Timeout::Error => e
resolved = nil
end
resolved
end
end
end
end
|
