Annotate

net/resolvers/basic.lua @ 13107:9c4dc1e6d2c9

mod_http: Add way to retrieve internal URL instead of external This could be of help when configuring reverse proxies, as it is the internal URL the proxy must point at. Argument treated as an enum "internal" "external"(default) to allow for future extensibility.
author Kim Alvefur <zash@zash.se>
date Wed, 24 May 2023 14:43:45 +0200
parent 12974:ba409c67353b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12974
ba409c67353b net: Prefix module imports with prosody namespace
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1 local adns = require "prosody.net.adns";
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2 local inet_pton = require "prosody.util.net".pton;
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3 local inet_ntop = require "prosody.util.net".ntop;
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4 local idna_to_ascii = require "prosody.util.encodings".idna.to_ascii;
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5 local promise = require "prosody.util.promise";
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6 local t_move = require "prosody.util.table".move;
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7
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8 local methods = {};
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9 local resolver_mt = { __index = methods };
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10
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913276ba0c47 net.connect: Mention RFC 6724 regression
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11 -- FIXME RFC 6724
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12
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13 local function do_dns_lookup(self, dns_resolver, record_type, name, allow_insecure)
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14 return promise.new(function (resolve, reject)
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15 local ipv = (record_type == "A" and "4") or (record_type == "AAAA" and "6") or nil;
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16 if ipv and self.extra["use_ipv"..ipv] == false then
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17 return reject(("IPv%s disabled - %s lookup skipped"):format(ipv, record_type));
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18 elseif record_type == "TLSA" and self.extra.use_dane ~= true then
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19 return reject("DANE disabled - TLSA lookup skipped");
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20 end
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21 dns_resolver:lookup(function (answer, err)
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22 if not answer then
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23 return reject(err);
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24 elseif answer.bogus then
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25 return reject(("Validation error in %s lookup"):format(record_type));
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26 elseif not (answer.secure or allow_insecure) then
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27 return reject(("Insecure response in %s lookup"):format(record_type));
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28 elseif answer.status and #answer == 0 then
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29 return reject(("%s in %s lookup"):format(answer.status, record_type));
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30 end
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31
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32 local targets = { secure = answer.secure };
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33 for _, record in ipairs(answer) do
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34 if ipv then
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35 table.insert(targets, { self.conn_type..ipv, record[record_type:lower()], self.port, self.extra });
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36 else
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37 table.insert(targets, record[record_type:lower()]);
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38 end
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39 end
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40 return resolve(targets);
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41 end, name, record_type, "IN");
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42 end);
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43 end
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44
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45 local function merge_targets(ipv4_targets, ipv6_targets)
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46 local result = { secure = ipv4_targets.secure and ipv6_targets.secure };
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47 local common_length = math.min(#ipv4_targets, #ipv6_targets);
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48 for i = 1, common_length do
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49 table.insert(result, ipv6_targets[i]);
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50 table.insert(result, ipv4_targets[i]);
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51 end
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52 if common_length < #ipv4_targets then
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53 t_move(ipv4_targets, common_length+1, #ipv4_targets, common_length+1, result);
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54 elseif common_length < #ipv6_targets then
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55 t_move(ipv6_targets, common_length+1, #ipv6_targets, common_length+1, result);
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56 end
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57 return result;
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58 end
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59
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60 -- Find the next target to connect to, and
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61 -- pass it to cb()
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62 function methods:next(cb)
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63 if self.targets then
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64 if #self.targets == 0 then
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65 cb(nil);
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66 return;
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67 end
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68 local next_target = table.remove(self.targets, 1);
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69 cb(next_target[1], next_target[2], next_target[3], next_target[4], not not self.targets[1]);
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70 return;
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71 end
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72
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73 if not self.hostname then
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74 self.last_error = "hostname failed IDNA";
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75 cb(nil);
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76 return;
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77 end
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78
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79 -- Resolve DNS to target list
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80 local dns_resolver = adns.resolver();
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81
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82 local dns_lookups = {
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83 ipv4 = do_dns_lookup(self, dns_resolver, "A", self.hostname, true);
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84 ipv6 = do_dns_lookup(self, dns_resolver, "AAAA", self.hostname, true);
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85 tlsa = do_dns_lookup(self, dns_resolver, "TLSA", ("_%d._%s.%s"):format(self.port, self.conn_type, self.hostname));
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86 };
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87
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88 promise.all_settled(dns_lookups):next(function (dns_results)
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89 -- Combine targets, assign to self.targets, self:next(cb)
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90 local have_ipv4 = dns_results.ipv4.status == "fulfilled";
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91 local have_ipv6 = dns_results.ipv6.status == "fulfilled";
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92
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93 if have_ipv4 and have_ipv6 then
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94 self.targets = merge_targets(dns_results.ipv4.value, dns_results.ipv6.value);
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95 elseif have_ipv4 then
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96 self.targets = dns_results.ipv4.value;
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97 elseif have_ipv6 then
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98 self.targets = dns_results.ipv6.value;
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99 else
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100 self.targets = {};
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101 end
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102
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103 if self.extra and self.extra.use_dane then
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104 if self.targets.secure and dns_results.tlsa.status == "fulfilled" then
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105 self.extra.tlsa = dns_results.tlsa.value;
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106 self.extra.dane_hostname = self.hostname;
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107 else
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108 self.extra.tlsa = nil;
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109 self.extra.dane_hostname = nil;
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110 end
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111 elseif self.extra and self.extra.srv_secure then
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112 self.extra.secure_hostname = self.hostname;
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113 end
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114
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115 self:next(cb);
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116 end):catch(function (err)
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117 self.last_error = err;
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118 self.targets = {};
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119 end);
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120 end
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121
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122 local function new(hostname, port, conn_type, extra)
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123 local ascii_host = idna_to_ascii(hostname);
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124 local targets = nil;
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125 conn_type = conn_type or "tcp";
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126
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127 local is_ip = inet_pton(hostname);
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128 if not is_ip and hostname:sub(1,1) == '[' then
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129 is_ip = inet_pton(hostname:sub(2,-2));
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130 end
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131 if is_ip then
10439
97c0f5fe5f41 net.resolvers.basic: Normalise IP literals, ensures net.server is happy
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132 hostname = inet_ntop(is_ip);
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133 if #is_ip == 16 then
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134 targets = { { conn_type.."6", hostname, port, extra } };
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diff changeset
135 elseif #is_ip == 4 then
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parents: 10400
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136 targets = { { conn_type.."4", hostname, port, extra } };
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parents: 10400
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137 end
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parents: 10400
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138 end
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parents: 10400
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139
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
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140 return setmetatable({
10436
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141 hostname = ascii_host;
8531
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 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
143 conn_type = conn_type;
12408
acfc51b9530c net.resolvers.basic: Refactor to remove code duplication
Matthew Wild <mwild1@gmail.com>
parents: 12129
diff changeset
144 extra = extra or {};
10436
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145 targets = targets;
8531
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parents:
diff changeset
146 }, resolver_mt);
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Matthew Wild <mwild1@gmail.com>
parents:
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147 end
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
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parents:
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148
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parents:
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149 return {
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parents:
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150 new = new;
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
151 };