prosody
6ed7fd28f5e3
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 12025:6ed7fd28f5e3

net.resolvers: Report when hostname fails IDNA Not a particularly user-friendly error message, but better than "unable to resolve service" and having no clue where it came from.
author Kim Alvefur <zash@zash.se>
date Tue, 07 Dec 2021 21:43:36 +0100
parent 11901:26406ce35e20
child 12129:7a68d5828f3b
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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2 local inet_pton = require "util.net".pton;
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3 local inet_ntop = require "util.net".ntop;
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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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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
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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 self.last_error = "hostname failed IDNA";
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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({
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131 hostname = ascii_host;
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601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
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:
diff changeset
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:
diff changeset
140 new = new;
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
141 };