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
|
---
-- This library implements the basics of NAT-PMP as described in the
-- NAT Port Mapping Protocol (NAT-PMP) draft:
-- o http://tools.ietf.org/html/draft-cheshire-nat-pmp-03
--
--
-- @author Patrik Karlsson <patrik@cqure.net>
--
local datetime = require "datetime"
local ipOps = require "ipOps"
local nmap = require "nmap"
local stdnse = require "stdnse"
local string = require "string"
_ENV = stdnse.module("natpmp", stdnse.seeall)
local ResultCode = {
SUCCESS = 0,
UNSUPPORTED_VERSION = 1,
NOT_AUTHORIZED = 2,
NETWORK_FAILURE = 3,
OUT_OF_RESOURCES = 4,
UNSUPPORTED_OPCODE = 5,
}
local ErrorMessage = {
[ResultCode.UNSUPPORTED_VERSION] = "The device did not support the protocol version",
[ResultCode.NOT_AUTHORIZED] = "The operation was not authorized",
[ResultCode.NETWORK_FAILURE] = "Network failure",
[ResultCode.OUT_OF_RESOURCES] = "The device is out of resources",
[ResultCode.UNSUPPORTED_OPCODE] = "The requested operation was not supported",
}
Request = {
GetWANIP = {
new = function(self)
local o = { version = 0, op = 0 }
setmetatable(o, self)
self.__index = self
return o
end,
__tostring = function(self)
return string.pack(">BB", self.version, self.op)
end,
},
MapPort = {
new = function(self, pubport, privport, proto, lifetime)
assert(proto == "udp" or proto == "tcp", "Unsupported protocol")
local o = {
version = 0,
pubport = pubport,
privport = privport,
proto = proto,
lifetime = lifetime or 3600
}
setmetatable(o, self)
self.__index = self
return o
end,
__tostring = function(self)
return string.pack(">BBI2I2I2I4",
self.version,
(self.proto=="udp" and 1 or 2),
0, -- reserved
self.privport, self.pubport,
self.lifetime)
end,
}
}
Response = {
GetWANIP = {
new = function(self, data)
local o = { data = data }
setmetatable(o, self)
self.__index = self
if ( o:parse() ) then
return o
end
end,
parse = function(self)
if ( #self.data ~= 12 ) then
return
end
local pos
self.version, self.op, self.rescode, pos = string.unpack(">BBI2", self.data)
if ( self.rescode ~= ResultCode.SUCCESS or self.op ~= 128 ) then
return
end
self.time, self.ip, pos = string.unpack(">I4I4", self.data, pos)
self.ip = ipOps.fromdword(self.ip)
self.time = datetime.format_timestamp(self.time)
return true
end,
},
MapPort = {
new = function(self, data)
local o = { data = data }
setmetatable(o, self)
self.__index = self
if ( o:parse() ) then
return o
end
end,
parse = function(self)
if ( #self.data ~= 16 ) then
return
end
local pos
self.version, self.op, self.rescode, pos = string.unpack(">BBI2", self.data)
if ( self.rescode ~= ResultCode.SUCCESS ) then
return
end
self.time, self.privport, self.pubport, self.lifetime, pos = string.unpack(">I4I2I2I4", self.data, pos)
return true
end,
}
}
Helper = {
new = function(self, host, port)
local o = { host = host, port = port }
setmetatable(o, self)
self.__index = self
return o
end,
exchPacket = function(self, data)
local socket = nmap.new_socket("udp")
socket:set_timeout(5000)
local status = socket:sendto(self.host, self.port, data)
if ( not(status) ) then
socket:close()
return false, "Failed to send request to device"
end
local response
status, response = socket:receive()
socket:close()
if ( not(status) ) then
return false, "Failed to receive response from router"
end
return true, response
end,
--- Gets the WAN ip of the router
getWANIP = function(self)
local packet = Request.GetWANIP:new()
local status, response = self:exchPacket(tostring(packet))
if ( not(status) ) then
return status, response
end
response = Response.GetWANIP:new(response)
if ( not(response) ) then
return false, "Failed to parse response from router"
end
return true, response
end,
--- Maps a public port to a private port
-- @param pubport number containing the public external port to map
-- @param privport number containing the private internal port to map
-- @param protocol string containing the protocol to map (udp|tcp)
-- @param lifetime [optional] number containing the lifetime in seconds
mapPort = function(self, pubport, privport, protocol, lifetime)
local packet = Request.MapPort:new(pubport, privport, protocol, lifetime)
local status, response = self:exchPacket(tostring(packet))
if ( not(status) ) then
return status, response
end
response = Response.MapPort:new(response)
if ( not(response) ) then
return false, "Failed to parse response from router"
end
return true, response
end,
unmapPort = function(self, pubport, privport)
return self:mapPort(pubport, privport, 0)
end,
unmapAllPorts = function(self)
return self.mapPort(0, 0, 0)
end,
}
return _ENV;
|
