prosody
ff36ac5c7d2b
util/dns.lua

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util/dns.lua @ 12299:ff36ac5c7d2b

mod_s2s: Disable creation of new outgoing connections during shutdown
author Kim Alvefur <zash@zash.se>
date Fri, 11 Feb 2022 21:41:04 +0100
parent 12289:3a655adf1d0d
child 12355:a0ff5c438e9d
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_format = string.format;
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13 local s_sub = string.sub;
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14
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15 local iana_data = require "util.dnsregistry";
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16 local tohex = require "util.hex".to;
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17 local inet_ntop = require "util.net".ntop;
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18
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19 -- Simplified versions of Waqas DNS parsers
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20 -- Only the per RR parsers are needed and only feed a single RR
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21
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22 local parsers = {};
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23
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24 -- No support for pointers, but libunbound appears to take care of that.
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25 local function readDnsName(packet, pos)
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26 if s_byte(packet, pos) == 0 then return ".", pos+1; end
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27 local pack_len, r, len = #packet, {};
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28 pos = pos or 1;
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29 repeat
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30 len = s_byte(packet, pos) or 0;
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31 t_insert(r, s_sub(packet, pos + 1, pos + len));
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32 pos = pos + len + 1;
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33 until len == 0 or pos >= pack_len;
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34 return t_concat(r, "."), pos;
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35 end
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36
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37 -- These are just simple names.
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38 parsers.CNAME = readDnsName;
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39 parsers.NS = readDnsName
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40 parsers.PTR = readDnsName;
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41
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42 local soa_mt = {
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43 __tostring = function(rr)
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44 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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45 end;
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46 };
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47 function parsers.SOA(packet)
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48 local mname, rname, offset;
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49
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50 mname, offset = readDnsName(packet, 1);
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51 rname, offset = readDnsName(packet, offset);
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52
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53 -- Extract all the bytes of these fields in one call
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54 local
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55 s1, s2, s3, s4, -- serial
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56 r1, r2, r3, r4, -- refresh
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57 t1, t2, t3, t4, -- retry
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58 e1, e2, e3, e4, -- expire
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59 m1, m2, m3, m4 -- minimum
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60 = s_byte(packet, offset, offset + 19);
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61
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62 return setmetatable({
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63 mname = mname;
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64 rname = rname;
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65 serial = s1*0x1000000 + s2*0x10000 + s3*0x100 + s4;
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66 refresh = r1*0x1000000 + r2*0x10000 + r3*0x100 + r4;
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67 retry = t1*0x1000000 + t2*0x10000 + t3*0x100 + t4;
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68 expire = e1*0x1000000 + e2*0x10000 + e3*0x100 + e4;
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69 minimum = m1*0x1000000 + m2*0x10000 + m3*0x100 + m4;
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70 }, soa_mt);
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71 end
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72
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73 parsers.A = inet_ntop;
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74 parsers.AAAA = inet_ntop;
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75
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76 local mx_mt = {
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77 __tostring = function(rr)
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78 return s_format("%d %s", rr.pref, rr.mx)
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79 end
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80 };
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81 function parsers.MX(packet)
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82 local name = readDnsName(packet, 3);
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83 local b1,b2 = s_byte(packet, 1, 2);
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84 return setmetatable({
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85 pref = b1*256+b2;
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86 mx = name;
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87 }, mx_mt);
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88 end
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89
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90 local srv_mt = {
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91 __tostring = function(rr)
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92 return s_format("%d %d %d %s", rr.priority, rr.weight, rr.port, rr.target);
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93 end
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94 };
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95 function parsers.SRV(packet)
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96 local name = readDnsName(packet, 7);
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97 local b1, b2, b3, b4, b5, b6 = s_byte(packet, 1, 6);
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98 return setmetatable({
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99 priority = b1*256+b2;
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100 weight = b3*256+b4;
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101 port = b5*256+b6;
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102 target = name;
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103 }, srv_mt);
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104 end
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105
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106 local txt_mt = { __tostring = t_concat };
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107 function parsers.TXT(packet)
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108 local pack_len = #packet;
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109 local r, pos, len = {}, 1;
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110 repeat
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111 len = s_byte(packet, pos) or 0;
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112 t_insert(r, s_sub(packet, pos + 1, pos + len));
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113 pos = pos + len + 1;
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114 until pos >= pack_len;
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115 return setmetatable(r, txt_mt);
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116 end
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117
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118 parsers.SPF = parsers.TXT;
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119
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120 -- Acronyms from RFC 7218
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121 local tlsa_usages = {
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122 [0] = "PKIX-CA";
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123 [1] = "PKIX-EE";
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124 [2] = "DANE-TA";
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125 [3] = "DANE-EE";
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126 [255] = "PrivCert";
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127 };
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128 local tlsa_selectors = {
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129 [0] = "Cert",
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130 [1] = "SPKI",
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131 [255] = "PrivSel",
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132 };
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133 local tlsa_match_types = {
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134 [0] = "Full",
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135 [1] = "SHA2-256",
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136 [2] = "SHA2-512",
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137 [255] = "PrivMatch",
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138 };
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139 local tlsa_mt = {
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140 __tostring = function(rr)
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141 return s_format("%s %s %s %s",
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142 tlsa_usages[rr.use] or rr.use,
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143 tlsa_selectors[rr.select] or rr.select,
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144 tlsa_match_types[rr.match] or rr.match,
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145 tohex(rr.data));
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146 end;
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147 __index = {
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148 getUsage = function(rr) return tlsa_usages[rr.use] end;
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149 getSelector = function(rr) return tlsa_selectors[rr.select] end;
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150 getMatchType = function(rr) return tlsa_match_types[rr.match] end;
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151 }
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152 };
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153 function parsers.TLSA(packet)
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154 local use, select, match = s_byte(packet, 1,3);
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155 return setmetatable({
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156 use = use;
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157 select = select;
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158 match = match;
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159 data = s_sub(packet, 4);
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160 }, tlsa_mt);
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161 end
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162
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163 local svcb_params = {"alpn"; "no-default-alpn"; "port"; "ipv4hint"; "ech"; "ipv6hint"};
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164 setmetatable(svcb_params, {__index = function(_, n) return "key" .. tostring(n); end});
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165
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166 local svcb_mt = {
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167 __tostring = function (rr)
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168 local kv = {};
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169 for i = 1, #rr.fields do
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170 t_insert(kv, s_format("%s=%q", svcb_params[rr.fields[i].key], tostring(rr.fields[i].value)));
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171 -- FIXME the =value part may be omitted when the value is "empty"
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172 end
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173 return s_format("%d %s %s", rr.prio, rr.name, t_concat(kv, " "));
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174 end;
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175 };
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176 local svbc_ip_mt = {__tostring = function(ip) return t_concat(ip, ", "); end}
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177
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178 function parsers.SVCB(packet)
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179 local prio_h, prio_l = packet:byte(1,2);
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180 local prio = prio_h*256+prio_l;
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181 local name, pos = readDnsName(packet, 3);
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182 local fields = {};
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183 while #packet > pos do
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184 local key_h, key_l = packet:byte(pos+0,pos+1);
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185 local len_h, len_l = packet:byte(pos+2,pos+3);
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186 local key = key_h*256+key_l;
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187 local len = len_h*256+len_l;
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188 local value = packet:sub(pos+4,pos+4-1+len)
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189 if key == 1 then
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190 value = setmetatable(parsers.TXT(value), svbc_ip_mt);
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191 elseif key == 3 then
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192 local port_h, port_l = value:byte(1,2);
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193 local port = port_h*256+port_l;
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194 value = port;
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195 elseif key == 4 then
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196 local ip = {};
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197 for i = 1, #value, 4 do
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198 t_insert(ip, parsers.A(value:sub(i, i+3)));
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199 end
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200 value = setmetatable(ip, svbc_ip_mt);
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201 elseif key == 6 then
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202 local ip = {};
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203 for i = 1, #value, 16 do
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204 t_insert(ip, parsers.AAAA(value:sub(i, i+15)));
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205 end
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206 value = setmetatable(ip, svbc_ip_mt);
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207 end
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208 t_insert(fields, { key = key, value = value, len = len });
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209 pos = pos+len+4;
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210 end
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211 return setmetatable({
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212 prio = prio, name = name, fields = fields,
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213 }, svcb_mt);
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214 end
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215
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216 parsers.HTTPS = parsers.SVCB;
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217
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218 local params = {
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219 TLSA = {
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220 use = tlsa_usages;
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221 select = tlsa_selectors;
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222 match = tlsa_match_types;
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223 };
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224 };
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225
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226 local fallback_mt = {
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227 __tostring = function(rr)
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228 return s_format([[\# %d %s]], #rr.raw, tohex(rr.raw));
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229 end;
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230 };
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231 local function fallback_parser(packet)
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232 return setmetatable({ raw = packet },fallback_mt);
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233 end
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234 setmetatable(parsers, { __index = function() return fallback_parser end });
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235
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236 return {
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237 parsers = parsers;
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238 classes = iana_data.classes;
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239 types = iana_data.types;
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240 errors = iana_data.errors;
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241 params = params;
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242 };