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
|
#--
#Copyright 2007 Nominet UK
#
#Licensed under the Apache License, Version 2.0 (the "License");
#you may not use this file except in compliance with the License.
#You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
#Unless required by applicable law or agreed to in writing, software
#distributed under the License is distributed on an "AS IS" BASIS,
#WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#See the License for the specific language governing permissions and
#limitations under the License.
#++
module Dnsruby
#== Dnsruby::SingleResolver
#
# This class has been deprecated.
# This implementation exists for legacy clients. New code should use the Dnsruby::Resolver class.
# The SingleResolver class targets a single resolver, and controls the sending of a single
# packet with a packet timeout. It performs no retries. Only two threads are used - the client
# thread and a select thread (which is reused across all queries).
#
#== Methods
#
#=== Synchronous
#These methods raise an exception or return a response message with rcode==NOERROR
#
#* Dnsruby::SingleResolver#send_message(msg [, use_tcp]))
#* Dnsruby::SingleResolver#query(name [, type [, klass]])
#
#=== Asynchronous
#These methods use a response queue to return the response and the error to the client.
#Support for EventMachine has been deprecated
#
#* Dnsruby::SingleResolver#send_async(...)
#
class SingleResolver < Resolver
# Can take a hash with the following optional keys :
#
# * :server
# * :port
# * :use_tcp
# * :no_tcp
# * :ignore_truncation
# * :src_address
# * :src_address6
# * :src_port
# * :udp_size
# * :persistent_tcp
# * :persistent_udp
# * :tsig
# * :packet_timeout
# * :recurse
def initialize(*args)
arg=args[0]
@single_res_mutex = Mutex.new
@packet_timeout = Resolver::DefaultPacketTimeout
@query_timeout = @packet_timeout
@port = Resolver::DefaultPort
@udp_size = Resolver::DefaultUDPSize
@dnssec = Resolver::DefaultDnssec
@use_tcp = false
@no_tcp = false
@tsig = nil
@ignore_truncation = false
@src_address = nil
@src_address6 = nil
@src_port = [0]
@recurse = true
@persistent_udp = false
@persistent_tcp = false
@retry_times = 1
@retry_delay = 0
@single_resolvers = []
@configured = false
@do_caching = true
@config = Config.new
if (arg==nil)
# Get default config
@config = Config.new
@config.get_ready
@server = @config.nameserver[0]
elsif (arg.kind_of?String)
@config.get_ready
@configured= true
@config.nameserver=[arg]
@server = @config.nameserver[0]
# @server=arg
elsif (arg.kind_of?Name)
@config.get_ready
@configured= true
@config.nameserver=arg
@server = @config.nameserver[0]
# @server=arg
elsif (arg.kind_of?Hash)
arg.keys.each do |attr|
if (attr == :server)
@config.get_ready
@configured= true
@config.nameserver=[arg[attr]]
@server = @config.nameserver[0]
else
begin
send(attr.to_s+"=", arg[attr])
rescue Exception
Dnsruby.log.error{"Argument #{attr} not valid\n"}
end
end
end
end
isr = PacketSender.new({:server=>@server, :dnssec=>@dnssec,
:use_tcp=>@use_tcp, :no_tcp=>@no_tcp, :packet_timeout=>@packet_timeout,
:tsig => @tsig, :ignore_truncation=>@ignore_truncation,
:src_address=>@src_address, :src_address6=>@src_address6, :src_port=>@src_port,
:recurse=>@recurse, :udp_size=>@udp_size})
@single_resolvers = [isr]
# ResolverRegister::register_single_resolver(self)
end
def server=(s)
if (!@configured)
@config.get_ready
end
@server = Config.resolve_server(s).to_s
isr = PacketSender.new({:server=>@server, :dnssec=>@dnssec,
:use_tcp=>@use_tcp, :no_tcp=>@no_tcp, :packet_timeout=>@packet_timeout,
:tsig => @tsig, :ignore_truncation=>@ignore_truncation,
:src_address=>@src_address, :src_address6=>@src_address6, :src_port=>@src_port,
:recurse=>@recurse, :udp_size=>@udp_size})
@single_res_mutex.synchronize {
@single_resolvers = [isr]
}
end
def server
# @single_res_mutex.synchronize {
if (!@configured)
@config.get_ready
add_config_nameservers
end
return @single_resolvers[0].server
# }
end
def retry_times=(n) # :nodoc:
raise NoMethodError.new("SingleResolver does not have retry_times")
end
def retry_delay=(n) # :nodoc:
raise NoMethodError.new("SingleResolver does not have retry_delay")
end
def packet_timeout=(t)
@packet_timeout = t
@query_timeout = t
end
# Add the appropriate EDNS OPT RR for the specified packet. This is done
# automatically, unless you are using Resolver#send_plain_message
def add_opt_rr(m)
@single_res_mutex.synchronize {
@single_resolvers[0].add_opt_rr(m)
}
end
alias :query_timeout :packet_timeout
alias :query_timeout= :packet_timeout=
end
end
|
