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
|
-- Prosody IM
-- Copyright (C) 2008-2011 Florian Zeitz
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local ip_methods = {};
local ip_mt = { __index = function (ip, key) return (ip_methods[key])(ip); end,
__tostring = function (ip) return ip.addr; end,
__eq = function (ipA, ipB) return ipA.addr == ipB.addr; end};
local hex2bits = { ["0"] = "0000", ["1"] = "0001", ["2"] = "0010", ["3"] = "0011", ["4"] = "0100", ["5"] = "0101", ["6"] = "0110", ["7"] = "0111", ["8"] = "1000", ["9"] = "1001", ["A"] = "1010", ["B"] = "1011", ["C"] = "1100", ["D"] = "1101", ["E"] = "1110", ["F"] = "1111" };
local function new_ip(ipStr, proto)
if not proto then
local sep = ipStr:match("^%x+(.)");
if sep == ":" or (not(sep) and ipStr:sub(1,1) == ":") then
proto = "IPv6"
elseif sep == "." then
proto = "IPv4"
end
if not proto then
return nil, "invalid address";
end
elseif proto ~= "IPv4" and proto ~= "IPv6" then
return nil, "invalid protocol";
end
local zone;
if proto == "IPv6" and ipStr:find('%', 1, true) then
ipStr, zone = ipStr:match("^(.-)%%(.*)");
end
if proto == "IPv6" and ipStr:find('.', 1, true) then
local changed;
ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d)
return (":%04X:%04X"):format(a*256+b,c*256+d);
end);
if changed ~= 1 then return nil, "invalid-address"; end
end
return setmetatable({ addr = ipStr, proto = proto, zone = zone }, ip_mt);
end
local function toBits(ip)
local result = "";
local fields = {};
if ip.proto == "IPv4" then
ip = ip.toV4mapped;
end
ip = (ip.addr):upper();
ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
if not ip:match(":$") then fields[#fields] = nil; end
for i, field in ipairs(fields) do
if field:len() == 0 and i ~= 1 and i ~= #fields then
for _ = 1, 16 * (9 - #fields) do
result = result .. "0";
end
else
for _ = 1, 4 - field:len() do
result = result .. "0000";
end
for j = 1, field:len() do
result = result .. hex2bits[field:sub(j, j)];
end
end
end
return result;
end
local function commonPrefixLength(ipA, ipB)
ipA, ipB = toBits(ipA), toBits(ipB);
for i = 1, 128 do
if ipA:sub(i,i) ~= ipB:sub(i,i) then
return i-1;
end
end
return 128;
end
local function v4scope(ip)
local fields = {};
ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
-- Loopback:
if fields[1] == 127 then
return 0x2;
-- Link-local unicast:
elseif fields[1] == 169 and fields[2] == 254 then
return 0x2;
-- Global unicast:
else
return 0xE;
end
end
local function v6scope(ip)
-- Loopback:
if ip:match("^[0:]*1$") then
return 0x2;
-- Link-local unicast:
elseif ip:match("^[Ff][Ee][89ABab]") then
return 0x2;
-- Site-local unicast:
elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
return 0x5;
-- Multicast:
elseif ip:match("^[Ff][Ff]") then
return tonumber("0x"..ip:sub(4,4));
-- Global unicast:
else
return 0xE;
end
end
local function label(ip)
if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
return 0;
elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
return 2;
elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
return 5;
elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
return 13;
elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
return 11;
elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
return 12;
elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
return 3;
elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
return 4;
else
return 1;
end
end
local function precedence(ip)
if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
return 50;
elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
return 30;
elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
return 5;
elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
return 3;
elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
return 1;
elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
return 1;
elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
return 1;
elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
return 35;
else
return 40;
end
end
local function toV4mapped(ip)
local fields = {};
local ret = "::ffff:";
ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
ret = ret .. ("%02x"):format(fields[1]);
ret = ret .. ("%02x"):format(fields[2]);
ret = ret .. ":"
ret = ret .. ("%02x"):format(fields[3]);
ret = ret .. ("%02x"):format(fields[4]);
return new_ip(ret, "IPv6");
end
function ip_methods:toV4mapped()
if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
local value = toV4mapped(self.addr);
self.toV4mapped = value;
return value;
end
function ip_methods:label()
local value;
if self.proto == "IPv4" then
value = label(self.toV4mapped);
else
value = label(self);
end
self.label = value;
return value;
end
function ip_methods:precedence()
local value;
if self.proto == "IPv4" then
value = precedence(self.toV4mapped);
else
value = precedence(self);
end
self.precedence = value;
return value;
end
function ip_methods:scope()
local value;
if self.proto == "IPv4" then
value = v4scope(self.addr);
else
value = v6scope(self.addr);
end
self.scope = value;
return value;
end
function ip_methods:private()
local private = self.scope ~= 0xE;
if not private and self.proto == "IPv4" then
local ip = self.addr;
local fields = {};
ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
if fields[1] == 127 or fields[1] == 10 or (fields[1] == 192 and fields[2] == 168)
or (fields[1] == 172 and (fields[2] >= 16 or fields[2] <= 32)) then
private = true;
end
end
self.private = private;
return private;
end
local function parse_cidr(cidr)
local bits;
local ip_len = cidr:find("/", 1, true);
if ip_len then
bits = tonumber(cidr:sub(ip_len+1, -1));
cidr = cidr:sub(1, ip_len-1);
end
return new_ip(cidr), bits;
end
local function match(ipA, ipB, bits)
local common_bits = commonPrefixLength(ipA, ipB);
if bits and ipB.proto == "IPv4" then
common_bits = common_bits - 96; -- v6 mapped addresses always share these bits
end
return common_bits >= (bits or 128);
end
return {new_ip = new_ip,
commonPrefixLength = commonPrefixLength,
parse_cidr = parse_cidr,
match=match};
|
