prosody
5eaf77114fdb
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 12590:5eaf77114fdb

compat: Use table.pack (there since Lua 5.2) over our util.table Added in d278a770eddc avoid having to deal with its absence in Lua 5.1. No longer needed when Lua 5.1 support is dropped.
author Kim Alvefur <zash@zash.se>
date Mon, 11 Jul 2022 19:15:24 +0200
parent 12413:e155f4509954
child 12601:72f7bb3f30d3
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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4 local idna_to_ascii = require "util.encodings".idna.to_ascii;
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5 local promise = require "util.promise";
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6 local t_move = require "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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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)
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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 answer.status and #answer == 0 then
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27 return reject(("%s in %s lookup"):format(answer.status, record_type));
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28 end
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29
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30 local targets = { secure = answer.secure };
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31 for _, record in ipairs(answer) do
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32 if ipv then
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33 table.insert(targets, { self.conn_type..ipv, record[record_type:lower()], self.port, self.extra });
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34 else
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35 table.insert(targets, record[record_type:lower()]);
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36 end
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37 end
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38 return resolve(targets);
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39 end, name, record_type, "IN");
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40 end);
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41 end
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42
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43 local function merge_targets(ipv4_targets, ipv6_targets)
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44 local result = { secure = ipv4_targets.secure and ipv6_targets.secure };
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45 local common_length = math.min(#ipv4_targets, #ipv6_targets);
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46 for i = 1, common_length do
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47 table.insert(result, ipv6_targets[i]);
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48 table.insert(result, ipv4_targets[i]);
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49 end
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50 if common_length < #ipv4_targets then
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51 t_move(ipv4_targets, common_length+1, #ipv4_targets, common_length+1, result);
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52 elseif common_length < #ipv6_targets then
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53 t_move(ipv6_targets, common_length+1, #ipv6_targets, common_length+1, result);
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54 end
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55 return result;
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56 end
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57
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58 -- Find the next target to connect to, and
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59 -- pass it to cb()
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60 function methods:next(cb)
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61 if self.targets then
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62 if #self.targets == 0 then
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63 cb(nil);
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64 return;
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65 end
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66 local next_target = table.remove(self.targets, 1);
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67 cb(next_target[1], next_target[2], next_target[3], next_target[4], not not self.targets[1]);
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68 return;
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69 end
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70
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71 if not self.hostname then
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72 self.last_error = "hostname failed IDNA";
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73 cb(nil);
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74 return;
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75 end
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76
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77 -- Resolve DNS to target list
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78 local dns_resolver = adns.resolver();
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79
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80 local dns_lookups = {
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81 ipv4 = do_dns_lookup(self, dns_resolver, "A", self.hostname);
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82 ipv6 = do_dns_lookup(self, dns_resolver, "AAAA", self.hostname);
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83 tlsa = do_dns_lookup(self, dns_resolver, "TLSA", ("_%d._%s.%s"):format(self.port, self.conn_type, self.hostname));
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84 };
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85
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86 promise.all_settled(dns_lookups):next(function (dns_results)
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87 -- Combine targets, assign to self.targets, self:next(cb)
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88 local have_ipv4 = dns_results.ipv4.status == "fulfilled";
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89 local have_ipv6 = dns_results.ipv6.status == "fulfilled";
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90
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91 if have_ipv4 and have_ipv6 then
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92 self.targets = merge_targets(dns_results.ipv4.value, dns_results.ipv6.value);
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93 elseif have_ipv4 then
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94 self.targets = dns_results.ipv4.value;
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95 elseif have_ipv6 then
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96 self.targets = dns_results.ipv6.value;
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97 else
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98 self.targets = {};
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99 end
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100
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101 if self.extra and self.extra.use_dane then
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102 if self.targets.secure and dns_results.tlsa.status == "fulfilled" then
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103 self.extra.tlsa = dns_results.tlsa.value;
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104 self.extra.dane_hostname = self.hostname;
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105 else
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106 self.extra.tlsa = nil;
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107 self.extra.dane_hostname = nil;
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108 end
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109 end
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110
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111 self:next(cb);
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112 end):catch(function (err)
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113 self.last_error = err;
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114 self.targets = {};
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115 end);
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116 end
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117
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118 local function new(hostname, port, conn_type, extra)
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119 local ascii_host = idna_to_ascii(hostname);
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120 local targets = nil;
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121 conn_type = conn_type or "tcp";
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122
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123 local is_ip = inet_pton(hostname);
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124 if not is_ip and hostname:sub(1,1) == '[' then
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125 is_ip = inet_pton(hostname:sub(2,-2));
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126 end
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127 if is_ip then
10439
97c0f5fe5f41 net.resolvers.basic: Normalise IP literals, ensures net.server is happy
Kim Alvefur <zash@zash.se>
parents: 10437
diff changeset
128 hostname = inet_ntop(is_ip);
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
129 if #is_ip == 16 then
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Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
130 targets = { { conn_type.."6", hostname, port, extra } };
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
131 elseif #is_ip == 4 then
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Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
132 targets = { { conn_type.."4", hostname, port, extra } };
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
133 end
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
134 end
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
135
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
136 return setmetatable({
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
137 hostname = ascii_host;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
138 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
139 conn_type = conn_type;
12408
acfc51b9530c net.resolvers.basic: Refactor to remove code duplication
Matthew Wild <mwild1@gmail.com>
parents: 12129
diff changeset
140 extra = extra or {};
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
141 targets = targets;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
142 }, resolver_mt);
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
143 end
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
144
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
145 return {
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
146 new = new;
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
147 };