summaryrefslogtreecommitdiff
path: root/lib/resolv-replace.rb
blob: a83e79d99603d4d843fc8e73a259e6b265999758 (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
# frozen_string_literal: true

require 'socket'
require 'resolv'

class << IPSocket
  # :stopdoc:
  alias original_resolv_getaddress getaddress
  # :startdoc:
  def getaddress(host)
    begin
      return Resolv.getaddress(host).to_s
    rescue Resolv::ResolvError
      raise SocketError, "Hostname not known: #{host}"
    end
  end
end

class TCPSocket < IPSocket
  # :stopdoc:
  alias original_resolv_initialize initialize
  # :startdoc:
  def initialize(host, serv, *rest)
    rest[0] = IPSocket.getaddress(rest[0]) if rest[0]
    original_resolv_initialize(IPSocket.getaddress(host), serv, *rest)
  end
end

class UDPSocket < IPSocket
  # :stopdoc:
  alias original_resolv_bind bind
  # :startdoc:
  def bind(host, port)
    host = IPSocket.getaddress(host) if host != ""
    original_resolv_bind(host, port)
  end

  # :stopdoc:
  alias original_resolv_connect connect
  # :startdoc:
  def connect(host, port)
    original_resolv_connect(IPSocket.getaddress(host), port)
  end

  # :stopdoc:
  alias original_resolv_send send
  # :startdoc:
  def send(mesg, flags, *rest)
    if rest.length == 2
      host, port = rest
      begin
        addrs = Resolv.getaddresses(host)
      rescue Resolv::ResolvError
        raise SocketError, "Hostname not known: #{host}"
      end
      addrs[0...-1].each {|addr|
        begin
          return original_resolv_send(mesg, flags, addr, port)
        rescue SystemCallError
        end
      }
      original_resolv_send(mesg, flags, addrs[-1], port)
    else
      original_resolv_send(mesg, flags, *rest)
    end
  end
end

class SOCKSSocket < TCPSocket
  # :stopdoc:
  alias original_resolv_initialize initialize
  # :startdoc:
  def initialize(host, serv)
    original_resolv_initialize(IPSocket.getaddress(host), port)
  end
end if defined? SOCKSSocket