prosody
1f42b08b134f
util/dns.lua

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util/dns.lua @ 11052:1f42b08b134f

util.startup: Init util.error with defaults if none given
author Matthew Wild <mwild1@gmail.com>
date Fri, 28 Aug 2020 12:54:31 +0100
parent 10972:b3773b1b90a1
child 12236:d0dfd48806f9
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
f93dce30089a util.dns: Library for decoding DNS records
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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
f93dce30089a util.dns: Library for decoding DNS records
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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
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
129 = s_byte(packet, offset, offset + 19);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
130
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
131 return setmetatable({
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
132 mname = mname;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
133 rname = rname;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
134 serial = s1*0x1000000 + s2*0x10000 + s3*0x100 + s4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
135 refresh = r1*0x1000000 + r2*0x10000 + r3*0x100 + r4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
136 retry = t1*0x1000000 + t2*0x10000 + t3*0x100 + t4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
137 expire = e1*0x1000000 + e2*0x10000 + e3*0x100 + e4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
138 minimum = m1*0x1000000 + m2*0x10000 + m3*0x100 + m4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
139 }, soa_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
140 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
141
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
142 function parsers.A(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
143 return s_format("%d.%d.%d.%d", s_byte(packet, 1, 4));
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
144 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
145
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
146 local aaaa = { nil, nil, nil, nil, nil, nil, nil, nil, };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
147 function parsers.AAAA(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
148 local hi, lo, ip, len, token;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
149 for i = 1, 8 do
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
150 hi, lo = s_byte(packet, i * 2 - 1, i * 2);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
151 aaaa[i] = s_format("%x", hi * 256 + lo); -- skips leading zeros
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
152 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
153 ip = t_concat(aaaa, ":", 1, 8);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
154 len = (s_match(ip, "^0:[0:]+()") or 1) - 1;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
155 for s in s_gmatch(ip, ":0:[0:]+") do
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
156 if len < #s then len, token = #s, s; end -- find longest sequence of zeros
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
157 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
158 return (s_gsub(ip, token or "^0:[0:]+", "::", 1));
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
159 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
160
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
161 if have_net then
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
162 parsers.A = net_util.ntop;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
163 parsers.AAAA = net_util.ntop;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
164 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
165
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
166 local mx_mt = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
167 __tostring = function(rr)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
168 return s_format("%d %s", rr.pref, rr.mx)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
169 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
170 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
171 function parsers.MX(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
172 local name = readDnsName(packet, 3);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
173 local b1,b2 = s_byte(packet, 1, 2);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
174 return setmetatable({
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
175 pref = b1*256+b2;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
176 mx = name;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
177 }, mx_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
178 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
179
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
180 local srv_mt = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
181 __tostring = function(rr)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
182 return s_format("%d %d %d %s", rr.priority, rr.weight, rr.port, rr.target);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
183 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
184 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
185 function parsers.SRV(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
186 local name = readDnsName(packet, 7);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
187 local b1, b2, b3, b4, b5, b6 = s_byte(packet, 1, 6);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
188 return setmetatable({
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
189 priority = b1*256+b2;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
190 weight = b3*256+b4;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
191 port = b5*256+b6;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
192 target = name;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
193 }, srv_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
194 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
195
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
196 local txt_mt = { __tostring = t_concat };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
197 function parsers.TXT(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
198 local pack_len = #packet;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
199 local r, pos, len = {}, 1;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
200 repeat
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
201 len = s_byte(packet, pos) or 0;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
202 t_insert(r, s_sub(packet, pos + 1, pos + len));
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
203 pos = pos + len + 1;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
204 until pos >= pack_len;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
205 return setmetatable(r, txt_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
206 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
207
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
208 parsers.SPF = parsers.TXT;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
209
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
210 -- Acronyms from RFC 7218
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
211 local tlsa_usages = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
212 [0] = "PKIX-CA";
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
213 [1] = "PKIX-EE";
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
214 [2] = "DANE-TA";
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
215 [3] = "DANE-EE";
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
216 [255] = "PrivCert";
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
217 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
218 local tlsa_selectors = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
219 [0] = "Cert",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
220 [1] = "SPKI",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
221 [255] = "PrivSel",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
222 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
223 local tlsa_match_types = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
224 [0] = "Full",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
225 [1] = "SHA2-256",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
226 [2] = "SHA2-512",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
227 [255] = "PrivMatch",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
228 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
229 local tlsa_mt = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
230 __tostring = function(rr)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
231 return s_format("%s %s %s %s",
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
232 tlsa_usages[rr.use] or rr.use,
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
233 tlsa_selectors[rr.select] or rr.select,
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
234 tlsa_match_types[rr.match] or rr.match,
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
235 tohex(rr.data));
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
236 end;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
237 __index = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
238 getUsage = function(rr) return tlsa_usages[rr.use] end;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
239 getSelector = function(rr) return tlsa_selectors[rr.select] end;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
240 getMatchType = function(rr) return tlsa_match_types[rr.match] end;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
241 }
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
242 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
243 function parsers.TLSA(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
244 local use, select, match = s_byte(packet, 1,3);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
245 return setmetatable({
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
246 use = use;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
247 select = select;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
248 match = match;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
249 data = s_sub(packet, 4);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
250 }, tlsa_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
251 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
252
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
253 local params = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
254 TLSA = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
255 use = tlsa_usages;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
256 select = tlsa_selectors;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
257 match = tlsa_match_types;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
258 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
259 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
260
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
261 local fallback_mt = {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
262 __tostring = function(rr)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
263 return s_format([[\# %d %s]], #rr.raw, tohex(rr.raw));
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
264 end;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
265 };
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
266 local function fallback_parser(packet)
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
267 return setmetatable({ raw = packet },fallback_mt);
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
268 end
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
269 setmetatable(parsers, { __index = function() return fallback_parser end });
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
270
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
271 return {
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
272 parsers = parsers;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
273 classes = classes;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
274 types = types;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
275 errors = errors;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
276 params = params;
f93dce30089a util.dns: Library for decoding DNS records
Kim Alvefur <zash@zash.se>
parents:
diff changeset
277 };