prosody
d0dfd48806f9
util/dns.lua

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util/dns.lua @ 12236:d0dfd48806f9

util.dns: Move DNS parameters details into util.dnsregistry Goal is to regenerate this file from the IANA registry using a tool. Having it in a separate file will reduce vcs noise in util.dns
author Kim Alvefur <zash@zash.se>
date Sun, 04 Oct 2020 19:23:16 +0200
parent 10972:b3773b1b90a1
child 12239:578ce0415398
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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f93dce30089a util.dns: Library for decoding DNS records
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1 -- libunbound based net.adns replacement for Prosody IM
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2 -- Copyright (C) 2012-2015 Kim Alvefur
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3 -- Copyright (C) 2012 Waqas Hussain
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4 --
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5 -- This file is MIT licensed.
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6
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7 local setmetatable = setmetatable;
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8 local table = table;
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9 local t_concat = table.concat;
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10 local t_insert = table.insert;
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11 local s_byte = string.byte;
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12 local s_char = string.char;
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13 local s_format = string.format;
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14 local s_gsub = string.gsub;
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15 local s_sub = string.sub;
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16 local s_match = string.match;
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17 local s_gmatch = string.gmatch;
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18
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19 local have_net, net_util = pcall(require, "util.net");
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20
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d0dfd48806f9 util.dns: Move DNS parameters details into util.dnsregistry
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21 local iana_data = require "util.dnsregistry";
10961
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22 if have_net and not net_util.ntop then -- Added in Prosody 0.11
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23 have_net = false;
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24 end
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25
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26 local chartohex = {};
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27
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28 for c = 0, 255 do
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29 chartohex[s_char(c)] = s_format("%02X", c);
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30 end
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31
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32 local function tohex(s)
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33 return (s_gsub(s, ".", chartohex));
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34 end
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35
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36 -- Simplified versions of Waqas DNS parsers
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37 -- Only the per RR parsers are needed and only feed a single RR
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38
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39 local parsers = {};
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40
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41 -- No support for pointers, but libunbound appears to take care of that.
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42 local function readDnsName(packet, pos)
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43 if s_byte(packet, pos) == 0 then return "."; end
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44 local pack_len, r, len = #packet, {};
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45 pos = pos or 1;
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46 repeat
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47 len = s_byte(packet, pos) or 0;
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48 t_insert(r, s_sub(packet, pos + 1, pos + len));
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49 pos = pos + len + 1;
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50 until len == 0 or pos >= pack_len;
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51 return t_concat(r, "."), pos;
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52 end
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53
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54 -- These are just simple names.
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55 parsers.CNAME = readDnsName;
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56 parsers.NS = readDnsName
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57 parsers.PTR = readDnsName;
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58
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59 local soa_mt = {
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60 __tostring = function(rr)
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61 return s_format("%s %s %d %d %d %d %d", rr.mname, rr.rname, rr.serial, rr.refresh, rr.retry, rr.expire, rr.minimum);
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62 end;
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63 };
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64 function parsers.SOA(packet)
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65 local mname, rname, offset;
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66
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67 mname, offset = readDnsName(packet, 1);
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68 rname, offset = readDnsName(packet, offset);
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69
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70 -- Extract all the bytes of these fields in one call
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71 local
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72 s1, s2, s3, s4, -- serial
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73 r1, r2, r3, r4, -- refresh
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74 t1, t2, t3, t4, -- retry
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75 e1, e2, e3, e4, -- expire
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76 m1, m2, m3, m4 -- minimum
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77 = s_byte(packet, offset, offset + 19);
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78
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79 return setmetatable({
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80 mname = mname;
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81 rname = rname;
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82 serial = s1*0x1000000 + s2*0x10000 + s3*0x100 + s4;
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83 refresh = r1*0x1000000 + r2*0x10000 + r3*0x100 + r4;
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84 retry = t1*0x1000000 + t2*0x10000 + t3*0x100 + t4;
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85 expire = e1*0x1000000 + e2*0x10000 + e3*0x100 + e4;
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86 minimum = m1*0x1000000 + m2*0x10000 + m3*0x100 + m4;
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87 }, soa_mt);
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88 end
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89
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90 function parsers.A(packet)
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91 return s_format("%d.%d.%d.%d", s_byte(packet, 1, 4));
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92 end
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93
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94 local aaaa = { nil, nil, nil, nil, nil, nil, nil, nil, };
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95 function parsers.AAAA(packet)
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96 local hi, lo, ip, len, token;
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97 for i = 1, 8 do
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98 hi, lo = s_byte(packet, i * 2 - 1, i * 2);
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99 aaaa[i] = s_format("%x", hi * 256 + lo); -- skips leading zeros
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100 end
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101 ip = t_concat(aaaa, ":", 1, 8);
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102 len = (s_match(ip, "^0:[0:]+()") or 1) - 1;
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103 for s in s_gmatch(ip, ":0:[0:]+") do
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104 if len < #s then len, token = #s, s; end -- find longest sequence of zeros
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105 end
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106 return (s_gsub(ip, token or "^0:[0:]+", "::", 1));
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107 end
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108
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109 if have_net then
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110 parsers.A = net_util.ntop;
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111 parsers.AAAA = net_util.ntop;
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112 end
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113
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114 local mx_mt = {
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115 __tostring = function(rr)
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116 return s_format("%d %s", rr.pref, rr.mx)
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117 end
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118 };
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119 function parsers.MX(packet)
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120 local name = readDnsName(packet, 3);
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121 local b1,b2 = s_byte(packet, 1, 2);
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122 return setmetatable({
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123 pref = b1*256+b2;
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124 mx = name;
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125 }, mx_mt);
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126 end
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127
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128 local srv_mt = {
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129 __tostring = function(rr)
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130 return s_format("%d %d %d %s", rr.priority, rr.weight, rr.port, rr.target);
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131 end
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132 };
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133 function parsers.SRV(packet)
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134 local name = readDnsName(packet, 7);
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135 local b1, b2, b3, b4, b5, b6 = s_byte(packet, 1, 6);
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136 return setmetatable({
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137 priority = b1*256+b2;
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138 weight = b3*256+b4;
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139 port = b5*256+b6;
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140 target = name;
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141 }, srv_mt);
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142 end
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143
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144 local txt_mt = { __tostring = t_concat };
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145 function parsers.TXT(packet)
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146 local pack_len = #packet;
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147 local r, pos, len = {}, 1;
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148 repeat
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149 len = s_byte(packet, pos) or 0;
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150 t_insert(r, s_sub(packet, pos + 1, pos + len));
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151 pos = pos + len + 1;
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152 until pos >= pack_len;
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153 return setmetatable(r, txt_mt);
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154 end
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155
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156 parsers.SPF = parsers.TXT;
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157
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158 -- Acronyms from RFC 7218
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159 local tlsa_usages = {
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160 [0] = "PKIX-CA";
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161 [1] = "PKIX-EE";
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162 [2] = "DANE-TA";
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163 [3] = "DANE-EE";
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164 [255] = "PrivCert";
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165 };
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166 local tlsa_selectors = {
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167 [0] = "Cert",
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168 [1] = "SPKI",
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169 [255] = "PrivSel",
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170 };
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171 local tlsa_match_types = {
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172 [0] = "Full",
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173 [1] = "SHA2-256",
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174 [2] = "SHA2-512",
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175 [255] = "PrivMatch",
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176 };
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177 local tlsa_mt = {
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178 __tostring = function(rr)
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179 return s_format("%s %s %s %s",
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180 tlsa_usages[rr.use] or rr.use,
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181 tlsa_selectors[rr.select] or rr.select,
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182 tlsa_match_types[rr.match] or rr.match,
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183 tohex(rr.data));
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184 end;
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185 __index = {
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186 getUsage = function(rr) return tlsa_usages[rr.use] end;
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187 getSelector = function(rr) return tlsa_selectors[rr.select] end;
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188 getMatchType = function(rr) return tlsa_match_types[rr.match] end;
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189 }
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190 };
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191 function parsers.TLSA(packet)
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192 local use, select, match = s_byte(packet, 1,3);
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193 return setmetatable({
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194 use = use;
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195 select = select;
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196 match = match;
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197 data = s_sub(packet, 4);
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198 }, tlsa_mt);
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199 end
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200
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201 local params = {
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202 TLSA = {
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203 use = tlsa_usages;
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204 select = tlsa_selectors;
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205 match = tlsa_match_types;
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206 };
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207 };
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208
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209 local fallback_mt = {
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210 __tostring = function(rr)
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211 return s_format([[\# %d %s]], #rr.raw, tohex(rr.raw));
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212 end;
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213 };
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214 local function fallback_parser(packet)
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215 return setmetatable({ raw = packet },fallback_mt);
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216 end
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217 setmetatable(parsers, { __index = function() return fallback_parser end });
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218
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219 return {
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220 parsers = parsers;
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221 classes = iana_data.classes;
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222 types = iana_data.types;
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223 errors = iana_data.errors;
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224 params = params;
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225 };