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prosody
Annotate
util/dns.lua @ 11870:1d1ed2be3491
util.startup: Understand -h, -? as --help in prosodyctl but ignore
prosodyctl -h showing an error was not very helpful, especially since
prosodyctl shows its help for any unknown (or none) command.
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 25 Oct 2021 15:47:18 +0200 |
parent | 10972:b3773b1b90a1 |
child | 12236:d0dfd48806f9 |
rev | line source |
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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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21 if have_net and not net_util.ntop then -- Added in Prosody 0.11 |
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22 have_net = false; |
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23 end |
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24 |
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25 local chartohex = {}; |
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26 |
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27 for c = 0, 255 do |
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28 chartohex[s_char(c)] = s_format("%02X", c); |
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29 end |
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30 |
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31 local function tohex(s) |
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32 return (s_gsub(s, ".", chartohex)); |
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33 end |
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34 |
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35 -- Converted from |
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36 -- http://www.iana.org/assignments/dns-parameters |
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37 -- 2020-06-25 |
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38 |
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39 local classes = { |
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40 IN = 1; "IN"; |
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41 nil; |
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42 CH = 3; "CH"; |
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43 HS = 4; "HS"; |
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44 }; |
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45 |
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46 local types = { |
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47 "A";"NS";"MD";"MF";"CNAME";"SOA";"MB";"MG";"MR";"NULL";"WKS";"PTR";"HINFO"; |
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48 "MINFO";"MX";"TXT";"RP";"AFSDB";"X25";"ISDN";"RT";"NSAP";"NSAP-PTR";"SIG"; |
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49 "KEY";"PX";"GPOS";"AAAA";"LOC";"NXT";"EID";"NIMLOC";"SRV";"ATMA";"NAPTR"; |
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50 "KX";"CERT";"A6";"DNAME";"SINK";"OPT";"APL";"DS";"SSHFP";"IPSECKEY";"RRSIG"; |
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51 "NSEC";"DNSKEY";"DHCID";"NSEC3";"NSEC3PARAM";"TLSA";"SMIMEA";[55]="HIP"; |
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52 [56]="NINFO";[57]="RKEY";[58]="TALINK";[59]="CDS";[60]="CDNSKEY";[61]="OPENPGPKEY"; |
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53 [62]="CSYNC";[63]="ZONEMD";[99]="SPF";[100]="UINFO";[101]="UID";[102]="GID"; |
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54 [103]="UNSPEC";[104]="NID";[105]="L32";[106]="L64";[107]="LP";[108]="EUI48"; |
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55 [109]="EUI64";["CSYNC"]=62;["TXT"]=16;["NAPTR"]=35;["A6"]=38;["RP"]=17; |
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56 ["TALINK"]=58;["NXT"]=30;["MR"]=9;["UINFO"]=100;["X25"]=19;["TKEY"]=249; |
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57 ["CERT"]=37;["SMIMEA"]=53;[252]="AXFR";[253]="MAILB";["CDS"]=59;[32769]="DLV"; |
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58 ["RT"]=21;["WKS"]=11;[249]="TKEY";["LP"]=107;[250]="TSIG";["SSHFP"]=44;["DS"]=43; |
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59 ["ISDN"]=20;["ATMA"]=34;["NS"]=2;[257]="CAA";["PX"]=26;["MX"]=15;["TSIG"]=250; |
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60 ["EID"]=31;["TLSA"]=52;["GID"]=102;["KX"]=36;["SPF"]=99;["DOA"]=259;["GPOS"]=27; |
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61 ["IPSECKEY"]=45;["NIMLOC"]=32;["RRSIG"]=46;["UID"]=101;["DNAME"]=39;["NSAP"]=22; |
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62 ["DNSKEY"]=48;["SINK"]=40;["DHCID"]=49;[32768]="TA";["NSAP-PTR"]=23;["AAAA"]=28; |
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63 ["PTR"]=12;["MINFO"]=14;["TA"]=32768;["EUI64"]=109;[260]="AMTRELAY"; |
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64 ["AMTRELAY"]=260;["CDNSKEY"]=60;[259]="DOA";["LOC"]=29;[258]="AVC";["AVC"]=258; |
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65 ["CAA"]=257;["MB"]=7;["*"]=255;[256]="URI";["URI"]=256;["SRV"]=33;["EUI48"]=108; |
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66 [255]="*";[254]="MAILA";["MAILA"]=254;["MAILB"]=253;["CNAME"]=5;[251]="IXFR"; |
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67 ["APL"]=42;["OPENPGPKEY"]=61;["MD"]=3;["NINFO"]=56;["ZONEMD"]=63;["RKEY"]=57; |
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68 ["L32"]=105;["NID"]=104;["HIP"]=55;["NSEC"]=47;["DLV"]=32769;["UNSPEC"]=103; |
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69 ["NSEC3PARAM"]=51;["MF"]=4;["MG"]=8;["AFSDB"]=18;["A"]=1;["SIG"]=24;["NSEC3"]=50; |
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70 ["HINFO"]=13;["IXFR"]=251;["NULL"]=10;["AXFR"]=252;["KEY"]=25;["OPT"]=41; |
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71 ["SOA"]=6;["L64"]=106; |
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72 } |
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73 |
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74 local errors = { |
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75 NoError = "No Error"; [0] = "NoError"; |
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76 FormErr = "Format Error"; "FormErr"; |
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77 ServFail = "Server Failure"; "ServFail"; |
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78 NXDomain = "Non-Existent Domain"; "NXDomain"; |
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79 NotImp = "Not Implemented"; "NotImp"; |
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80 Refused = "Query Refused"; "Refused"; |
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81 YXDomain = "Name Exists when it should not"; "YXDomain"; |
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82 YXRRSet = "RR Set Exists when it should not"; "YXRRSet"; |
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83 NXRRSet = "RR Set that should exist does not"; "NXRRSet"; |
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84 NotAuth = "Server Not Authoritative for zone"; "NotAuth"; |
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85 NotZone = "Name not contained in zone"; "NotZone"; |
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86 }; |
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87 |
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88 -- Simplified versions of Waqas DNS parsers |
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89 -- Only the per RR parsers are needed and only feed a single RR |
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90 |
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91 local parsers = {}; |
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92 |
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93 -- No support for pointers, but libunbound appears to take care of that. |
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94 local function readDnsName(packet, pos) |
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95 if s_byte(packet, pos) == 0 then return "."; end |
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96 local pack_len, r, len = #packet, {}; |
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97 pos = pos or 1; |
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98 repeat |
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99 len = s_byte(packet, pos) or 0; |
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100 t_insert(r, s_sub(packet, pos + 1, pos + len)); |
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101 pos = pos + len + 1; |
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102 until len == 0 or pos >= pack_len; |
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103 return t_concat(r, "."), pos; |
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104 end |
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105 |
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106 -- These are just simple names. |
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107 parsers.CNAME = readDnsName; |
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108 parsers.NS = readDnsName |
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109 parsers.PTR = readDnsName; |
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110 |
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111 local soa_mt = { |
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112 __tostring = function(rr) |
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113 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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114 end; |
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115 }; |
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116 function parsers.SOA(packet) |
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117 local mname, rname, offset; |
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118 |
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119 mname, offset = readDnsName(packet, 1); |
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120 rname, offset = readDnsName(packet, offset); |
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121 |
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122 -- Extract all the bytes of these fields in one call |
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123 local |
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124 s1, s2, s3, s4, -- serial |
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125 r1, r2, r3, r4, -- refresh |
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126 t1, t2, t3, t4, -- retry |
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127 e1, e2, e3, e4, -- expire |
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128 m1, m2, m3, m4 -- minimum |
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129 = s_byte(packet, offset, offset + 19); |
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130 |
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131 return setmetatable({ |
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132 mname = mname; |
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133 rname = rname; |
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134 serial = s1*0x1000000 + s2*0x10000 + s3*0x100 + s4; |
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135 refresh = r1*0x1000000 + r2*0x10000 + r3*0x100 + r4; |
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136 retry = t1*0x1000000 + t2*0x10000 + t3*0x100 + t4; |
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137 expire = e1*0x1000000 + e2*0x10000 + e3*0x100 + e4; |
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138 minimum = m1*0x1000000 + m2*0x10000 + m3*0x100 + m4; |
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139 }, soa_mt); |
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140 end |
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141 |
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142 function parsers.A(packet) |
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143 return s_format("%d.%d.%d.%d", s_byte(packet, 1, 4)); |
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144 end |
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145 |
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146 local aaaa = { nil, nil, nil, nil, nil, nil, nil, nil, }; |
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147 function parsers.AAAA(packet) |
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148 local hi, lo, ip, len, token; |
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149 for i = 1, 8 do |
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150 hi, lo = s_byte(packet, i * 2 - 1, i * 2); |
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151 aaaa[i] = s_format("%x", hi * 256 + lo); -- skips leading zeros |
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152 end |
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153 ip = t_concat(aaaa, ":", 1, 8); |
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154 len = (s_match(ip, "^0:[0:]+()") or 1) - 1; |
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155 for s in s_gmatch(ip, ":0:[0:]+") do |
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156 if len < #s then len, token = #s, s; end -- find longest sequence of zeros |
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157 end |
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158 return (s_gsub(ip, token or "^0:[0:]+", "::", 1)); |
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159 end |
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160 |
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161 if have_net then |
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162 parsers.A = net_util.ntop; |
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163 parsers.AAAA = net_util.ntop; |
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164 end |
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165 |
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166 local mx_mt = { |
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167 __tostring = function(rr) |
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168 return s_format("%d %s", rr.pref, rr.mx) |
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169 end |
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170 }; |
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171 function parsers.MX(packet) |
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172 local name = readDnsName(packet, 3); |
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173 local b1,b2 = s_byte(packet, 1, 2); |
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174 return setmetatable({ |
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175 pref = b1*256+b2; |
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176 mx = name; |
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177 }, mx_mt); |
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178 end |
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179 |
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180 local srv_mt = { |
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181 __tostring = function(rr) |
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182 return s_format("%d %d %d %s", rr.priority, rr.weight, rr.port, rr.target); |
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183 end |
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184 }; |
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185 function parsers.SRV(packet) |
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186 local name = readDnsName(packet, 7); |
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187 local b1, b2, b3, b4, b5, b6 = s_byte(packet, 1, 6); |
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188 return setmetatable({ |
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189 priority = b1*256+b2; |
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190 weight = b3*256+b4; |
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191 port = b5*256+b6; |
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192 target = name; |
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193 }, srv_mt); |
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194 end |
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195 |
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196 local txt_mt = { __tostring = t_concat }; |
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197 function parsers.TXT(packet) |
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198 local pack_len = #packet; |
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199 local r, pos, len = {}, 1; |
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200 repeat |
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201 len = s_byte(packet, pos) or 0; |
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202 t_insert(r, s_sub(packet, pos + 1, pos + len)); |
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203 pos = pos + len + 1; |
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204 until pos >= pack_len; |
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205 return setmetatable(r, txt_mt); |
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206 end |
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207 |
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208 parsers.SPF = parsers.TXT; |
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209 |
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210 -- Acronyms from RFC 7218 |
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211 local tlsa_usages = { |
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212 [0] = "PKIX-CA"; |
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213 [1] = "PKIX-EE"; |
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214 [2] = "DANE-TA"; |
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215 [3] = "DANE-EE"; |
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216 [255] = "PrivCert"; |
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217 }; |
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218 local tlsa_selectors = { |
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219 [0] = "Cert", |
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220 [1] = "SPKI", |
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221 [255] = "PrivSel", |
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222 }; |
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223 local tlsa_match_types = { |
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224 [0] = "Full", |
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225 [1] = "SHA2-256", |
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226 [2] = "SHA2-512", |
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227 [255] = "PrivMatch", |
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228 }; |
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229 local tlsa_mt = { |
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230 __tostring = function(rr) |
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231 return s_format("%s %s %s %s", |
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232 tlsa_usages[rr.use] or rr.use, |
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233 tlsa_selectors[rr.select] or rr.select, |
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234 tlsa_match_types[rr.match] or rr.match, |
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235 tohex(rr.data)); |
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236 end; |
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237 __index = { |
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238 getUsage = function(rr) return tlsa_usages[rr.use] end; |
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239 getSelector = function(rr) return tlsa_selectors[rr.select] end; |
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240 getMatchType = function(rr) return tlsa_match_types[rr.match] end; |
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241 } |
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242 }; |
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243 function parsers.TLSA(packet) |
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244 local use, select, match = s_byte(packet, 1,3); |
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245 return setmetatable({ |
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246 use = use; |
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247 select = select; |
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248 match = match; |
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249 data = s_sub(packet, 4); |
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250 }, tlsa_mt); |
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251 end |
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252 |
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253 local params = { |
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254 TLSA = { |
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255 use = tlsa_usages; |
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256 select = tlsa_selectors; |
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257 match = tlsa_match_types; |
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258 }; |
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259 }; |
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260 |
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261 local fallback_mt = { |
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262 __tostring = function(rr) |
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263 return s_format([[\# %d %s]], #rr.raw, tohex(rr.raw)); |
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264 end; |
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265 }; |
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266 local function fallback_parser(packet) |
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267 return setmetatable({ raw = packet },fallback_mt); |
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268 end |
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269 setmetatable(parsers, { __index = function() return fallback_parser end }); |
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270 |
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271 return { |
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272 parsers = parsers; |
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273 classes = classes; |
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274 types = types; |
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275 errors = errors; |
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276 params = params; |
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277 }; |