view mod_srvinjection/mod_srvinjection.lua @ 5296:0f5657db1cfc

mod_isolate_host: handle server-generated stanzas The hook for setting the no_host_isolation is only called for c2s sessions. This does not work for stanzas generated by the server, such as PEP notifications or presence probe answers. To handle that, we do per-stanza checks for the case that the origin is local.
author Jonas Schäfer <jonas@wielicki.name>
date Sat, 01 Apr 2023 12:03:08 +0200
parents 47fb4f36dacd
children
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module:set_global();

local adns = require "net.adns";

local map_config = module:get_option("srvinjection") or {};
local map = module:shared "s2s_map"

for host, mapping in pairs(map_config) do
	if type(mapping) == "table" and type(mapping[1]) == "string" and (type(mapping[2]) == "number") then
		local connecthost, connectport = mapping[1], mapping[2] or 5269;
		map[host] = {{
			srv = {
				target = connecthost..".";
				port = connectport;
				priority = 1;
				weight = 0;
			};
		}};
	else
		module:log("warn", "Ignoring invalid SRV injection for host '%s'", host);
		map[host] = nil;
	end
end

local original_lookup = adns.lookup;
function adns.lookup(handler, qname, qtype, qclass)
	if qtype == "SRV" then
		local host = qname:match("^_xmpp%-server%._tcp%.(.*)%.$");
		local mapping = map[host] or map["*"];
		if mapping then
			handler(mapping);
			return;
		end
	elseif qtype == "A" then
		if (qname == "localhost." or qname == "127.0.0.1.") then
			handler({{ a = "127.0.0.1" }});
			return;
		end
		local ip = qname:match("^(%d+.%d+.%d+.%d+).$");
		if ip then
			handler({{ a = ip }});
			return;
		end
	end
	return original_lookup(handler, qname, qtype, qclass);
end

function module.unload()
	adns.lookup = original_lookup;
end