prosody
06453c564141
net/resolvers/basic.lua

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net/resolvers/basic.lua @ 13014:06453c564141

util.startup: Add prosody.started promise to easily execute code after startup To avoid a race where server-started fires before the promise function body is run (on next tick), I moved server-started to fire on the next tick, which seems sensible anyway. Errors are logged, I'm not sure if we ought to be doing something more here. I'm sure we'll find out.
author Matthew Wild <mwild1@gmail.com>
date Sat, 01 Apr 2023 11:56:38 +0100
parent 12974:ba409c67353b
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rev   line source
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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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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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fcfc8f4d14a8 net.resolvers.basic: Fix resolution of IPv6 literals (in brackets) (fixes #1459)
Kim Alvefur <zash@zash.se>
parents: 10436
diff changeset
128 if not is_ip and hostname:sub(1,1) == '[' then
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parents: 10436
diff changeset
129 is_ip = inet_pton(hostname:sub(2,-2));
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parents: 10436
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130 end
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
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parents: 10400
diff changeset
131 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
132 hostname = inet_ntop(is_ip);
10436
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Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
133 if #is_ip == 16 then
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Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
134 targets = { { conn_type.."6", hostname, port, extra } };
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
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parents: 10400
diff changeset
135 elseif #is_ip == 4 then
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parents: 10400
diff changeset
136 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
137 end
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
138 end
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
139
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
140 return setmetatable({
10436
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
141 hostname = ascii_host;
8531
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
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
0d702ec77f0c net.resolvers.basic: Move IP literal check to constructor
Kim Alvefur <zash@zash.se>
parents: 10400
diff changeset
145 targets = targets;
8531
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
146 }, resolver_mt);
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
147 end
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
148
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
149 return {
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
150 new = new;
601681acea73 net.connect: New API for outgoing connections, based on 'service resolvers'
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
151 };