prosody-modules
ba312cd7907f
mod_dnsupdate/mod_dnsupdate.lua

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mod_dnsupdate/mod_dnsupdate.lua @ 4762:ba312cd7907f

mod_dnsupdate: Use with nsupdate to update DNS records from config
author Kim Alvefur <zash@zash.se>
date Sat, 06 Nov 2021 14:48:35 +0100
child 4763:91077c928c57
comparison
equal deleted inserted replaced
4761:ea1ecbc1d04d 4762:ba312cd7907f
1 module:set_global();
2
3 local config = require "core.configmanager";
4 local argparse = require "util.argparse";
5 local dns = require"net.adns".resolver();
6 local async = require "util.async";
7 local set = require "util.set";
8 local nameprep = require"util.encodings".stringprep.nameprep;
9 local idna_to_ascii = require"util.encodings".idna.to_ascii;
10
11 local services = { "xmpp-client"; "xmpps-client"; "xmpp-server"; "xmpps-server" }
12
13 local function validate_dnsname_option(options, option_name, default)
14 local host = options[option_name];
15 if host == nil then return default end
16 local normalized = nameprep(host);
17 if not normalized then
18 module:log("error", "--%s %q fails normalization");
19 return;
20 end
21 local alabel = idna_to_ascii(normalized);
22 if not alabel then
23 module:log("error", "--%s %q fails IDNA");
24 return;
25 end
26 return alabel;
27 end
28
29 function module.command(arg)
30 local opts = argparse.parse(arg, {
31 short_params = { d = "domain"; p = "primary"; t = "target"; l = "ttl"; h = "help"; ["?"] = "help" };
32 value_params = { domain = true; primary = true; target = true; ttl = true };
33 });
34
35 if not arg[1] or arg[2] or not opts or opts.help or not opts.domain then
36 local out = opts.help and io.stdout or io.stderr;
37 out:write("prosodyctl mod_dnsupdate [options] virtualhost\n");
38 out:write("\t-d --domain\tbase domain name *required*\n");
39 out:write("\t-p --primary\tprimary DNS name server\n");
40 out:write("\t-t --target\ttarget hostname for SRV\n");
41 out:write("\t-l --ttl\tTTL to use\n");
42 out:write("\t--each\tremove and replace individual SRV records\n");
43 out:write("\t--reset\tremove and replace all SRV records\n");
44 return opts and opts.help and 0 or 1;
45 end
46
47 local vhost = nameprep(arg[1]); -- TODO loop over arg[]?
48 if not vhost then
49 module:log("error", "Host %q fails normalization", arg[1]);
50 return 1;
51 end
52 local ihost = idna_to_ascii(vhost);
53 if not ihost then
54 module:log("error", "Host %q falis IDNA", vhost);
55 return 1;
56 end
57 if not config.get(vhost, "defined") then
58 module:log("error", "Host %q is not defined in the config", vhost);
59 return 1;
60 end
61
62 local domain = validate_dnsname_option(opts, "domain");
63 if not domain then
64 module:log("error", "--domain is required");
65 return 1;
66 end
67 local primary = validate_dnsname_option(opts, "primary")
68 or async.wait_for(dns:lookup_promise(domain, "SOA"):next(function(ret) return ret[1].soa.mname; end));
69 if not primary then
70 module:log("error", "Could not discover primary name server, specify it with --primary");
71 return 1;
72 end
73 local target = validate_dnsname_option(opts, "target", module:context(vhost):get_option_string("xmpp_host", ihost));
74 -- TODO validate that target has A/AAAA
75
76 local configured_ports = {
77 ["xmpp-client"] = module:get_option_array("c2s_ports", { 5222 });
78 ["xmpp-server"] = module:get_option_array("c2s_ports", { 5269 });
79 ["xmpps-client"] = module:get_option_array("c2s_direct_tls_ports", {});
80 ["xmpps-server"] = module:get_option_array("c2s_ports", {});
81 };
82
83 if opts.multiplex then
84 for opt, ports in pairs(configured_ports) do
85 ports:append(module:get_option_array(opt:sub(1, 5) == "xmpps" and "ssl_ports" or "ports", {}));
86 end
87 end
88
89 local existing_srv = {};
90 for _, service in ipairs(services) do
91 existing_srv[service] = dns:lookup_promise(("_%s._tcp.%s"):format(service, ihost), "SRV");
92 end
93
94 print("zone", domain);
95 print("server", primary);
96 print("ttl " .. tostring(opts.ttl or 60 * 60));
97
98 for _, service in ipairs(services) do
99 local ports = set.new(configured_ports[service]);
100 local records = (async.wait_for(existing_srv[service]));
101 local replace = opts.reset;
102 for _, rr in ipairs(records) do
103 if not ports:contains(rr.srv.port) or target ~= nameprep(rr.srv.target):gsub("%.$", "") then
104 if not opts.each then
105 replace = true;
106 break
107 end
108 print(("del _%s._tcp.%s IN SRV %s"):format(service, ihost, rr));
109 end
110 end
111 if replace then
112 print(("del _%s._tcp.%s IN SRV"):format(service, ihost));
113 for port in ports do print(("add _%s._tcp.%s IN SRV 1 1 %d %s"):format(service, ihost, port, target)); end
114 end
115 end
116
117 print("show");
118 print("send");
119 print("answer");
120 end