prosody
628374809421
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 11978:628374809421

mod_smacks: Remove redundant fields Given that the registry is scoped per user and the module is scoped per host, there seems no point to checking or storing both username and host here.
author Kim Alvefur <zash@zash.se>
date Wed, 01 Dec 2021 16:26:53 +0100
parent 11901:26406ce35e20
child 12025:6ed7fd28f5e3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 local adns = require "net.adns";
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ae7cf011e46a net.resolvers.basic: Support IP address literals
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2 local inet_pton = require "util.net".pton;
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97c0f5fe5f41 net.resolvers.basic: Normalise IP literals, ensures net.server is happy
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3 local inet_ntop = require "util.net".ntop;
10384
94c9c574cd8a net.resolvers: Apply IDNA conversion to ascii for DNS lookups (fixes #1426)
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4 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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e11e076f0eb8 various: Don't rely on _G.unpack existing
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5 local unpack = table.unpack or unpack; -- luacheck: ignore 113
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6
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7 local methods = {};
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8 local resolver_mt = { __index = methods };
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9
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913276ba0c47 net.connect: Mention RFC 6724 regression
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10 -- FIXME RFC 6724
10484
b13a31cea7d9 net.connect: Add some TODOs and FIXMEs
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11
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12 -- Find the next target to connect to, and
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13 -- pass it to cb()
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14 function methods:next(cb)
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15 if self.targets then
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16 if #self.targets == 0 then
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17 cb(nil);
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18 return;
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19 end
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20 local next_target = table.remove(self.targets, 1);
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21 cb(unpack(next_target, 1, 4));
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22 return;
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23 end
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24
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62a7042e0771 net.resolvers: Abort on hostnames not passing IDNA validation
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25 if not self.hostname then
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26 -- FIXME report IDNA error
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27 cb(nil);
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28 return;
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29 end
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30
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31 local secure = true;
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32 local tlsa = {};
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33 local targets = {};
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34 local n = 3;
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35 local function ready()
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36 n = n - 1;
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37 if n > 0 then return; end
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38 self.targets = targets;
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39 if self.extra and self.extra.use_dane then
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40 if secure and tlsa[1] then
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41 self.extra.tlsa = tlsa;
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42 self.extra.dane_hostname = self.hostname;
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43 else
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44 self.extra.tlsa = nil;
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45 self.extra.dane_hostname = nil;
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46 end
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47 end
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48 self:next(cb);
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49 end
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50
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51 -- Resolve DNS to target list
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52 local dns_resolver = adns.resolver();
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53
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54 if not self.extra or self.extra.use_ipv4 ~= false then
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55 dns_resolver:lookup(function (answer, err)
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56 if answer then
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57 secure = secure and answer.secure;
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58 for _, record in ipairs(answer) do
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59 table.insert(targets, { self.conn_type.."4", record.a, self.port, self.extra });
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60 end
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61 if answer.status then
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62 self.last_error = answer.status .. " in A lookup";
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63 end
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64 else
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65 self.last_error = err;
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66 end
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67 ready();
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68 end, self.hostname, "A", "IN");
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69 else
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70 ready();
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71 end
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72
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73 if not self.extra or self.extra.use_ipv6 ~= false then
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74 dns_resolver:lookup(function (answer, err)
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75 if answer then
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76 secure = secure and answer.secure;
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77 for _, record in ipairs(answer) do
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78 table.insert(targets, { self.conn_type.."6", record.aaaa, self.port, self.extra });
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79 end
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80 if answer.status then
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81 self.last_error = answer.status .. " in AAAA lookup";
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82 end
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83 else
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84 self.last_error = err;
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85 end
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86 ready();
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87 end, self.hostname, "AAAA", "IN");
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88 else
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89 ready();
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90 end
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91
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92 if self.extra and self.extra.use_dane == true then
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93 dns_resolver:lookup(function (answer, err)
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94 if answer then
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95 secure = secure and answer.secure;
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96 for _, record in ipairs(answer) do
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97 table.insert(tlsa, record.tlsa);
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98 end
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99 if answer.status then
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100 self.last_error = answer.status .. " in TLSA lookup";
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101 end
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102 else
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103 self.last_error = err;
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104 end
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105 ready();
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106 end, ("_%d._tcp.%s"):format(self.port, self.hostname), "TLSA", "IN");
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107 else
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108 ready();
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109 end
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110 end
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111
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112 local function new(hostname, port, conn_type, extra)
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113 local ascii_host = idna_to_ascii(hostname);
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114 local targets = nil;
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115 conn_type = conn_type or "tcp";
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116
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117 local is_ip = inet_pton(hostname);
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118 if not is_ip and hostname:sub(1,1) == '[' then
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119 is_ip = inet_pton(hostname:sub(2,-2));
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120 end
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121 if is_ip then
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122 hostname = inet_ntop(is_ip);
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123 if #is_ip == 16 then
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124 targets = { { conn_type.."6", hostname, port, extra } };
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125 elseif #is_ip == 4 then
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126 targets = { { conn_type.."4", hostname, port, extra } };
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127 end
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128 end
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129
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130 return setmetatable({
10436
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131 hostname = ascii_host;
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132 port = port;
11007
1d8e1f7a587c net.resolvers.basic: Default conn_type to 'tcp' consistently if unspecified (thanks marc0s)
Matthew Wild <mwild1@gmail.com>
parents: 10439
diff changeset
133 conn_type = conn_type;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
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134 extra = extra;
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
135 targets = targets;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
136 }, resolver_mt);
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
137 end
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
139 return {
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
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140 new = new;
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 };