aboutsummaryrefslogtreecommitdiffstats
path: root/plugins/mod_posix.lua
blob: 0f28041c2306339c49fdd10353a3e5fad8a279b7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
-- 
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--


local want_pposix_version = "0.3.2";

local pposix = assert(require "util.pposix");
if pposix._VERSION ~= want_pposix_version then module:log("warn", "Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version); end

local signal = select(2, pcall(require, "util.signal"));
if type(signal) == "string" then
	module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
end

local logger_set = require "util.logger".setwriter;

local prosody = _G.prosody;

module.host = "*"; -- we're a global module

-- Allow switching away from root, some people like strange ports.
module:add_event_hook("server-started", function ()
		local uid = module:get_option("setuid");
		local gid = module:get_option("setgid");
		if gid then
			local success, msg = pposix.setgid(gid);
			if success then
				module:log("debug", "Changed group to "..gid.." successfully.");
			else
				module:log("error", "Failed to change group to "..gid..". Error: "..msg);
				prosody.shutdown("Failed to change group to "..gid);
			end
		end
		if uid then
			local success, msg = pposix.setuid(uid);
			if success then
				module:log("debug", "Changed user to "..uid.." successfully.");
			else
				module:log("error", "Failed to change user to "..uid..". Error: "..msg);
				prosody.shutdown("Failed to change user to "..uid);
			end
		end
	end);

-- Don't even think about it!
module:add_event_hook("server-starting", function ()
		local suid = module:get_option("setuid");
		if not suid or suid == 0 or suid == "root" then
			if pposix.getuid() == 0 and not module:get_option("run_as_root") then
				module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
				module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
				prosody.shutdown("Refusing to run as root");
			end
		end
	end);

local pidfile_written;

local function remove_pidfile()
	if pidfile_written then
		os.remove(pidfile_written);
		pidfile_written = nil;
	end
end

local function write_pidfile()
	if pidfile_written then
		remove_pidfile();
	end
	local pidfile = module:get_option("pidfile");
	if pidfile then
		local pf, err = io.open(pidfile, "w+");
		if not pf then
			module:log("error", "Couldn't write pidfile; %s", err);
		else
			pf:write(tostring(pposix.getpid()));
			pf:close();
			pidfile_written = pidfile;
		end
	end
end

local syslog_opened 
function syslog_sink_maker(config)
	if not syslog_opened then
		pposix.syslog_open("prosody");
		syslog_opened = true;
	end
	local syslog, format = pposix.syslog_log, string.format;
	return function (name, level, message, ...)
			if ... then
				syslog(level, format(message, ...));
			else
				syslog(level, message);
			end
		end;
end
require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);

local daemonize = module:get_option("daemonize");
if daemonize == nil then
	local no_daemonize = module:get_option("no_daemonize"); --COMPAT w/ 0.5
	daemonize = not no_daemonize;
	if no_daemonize ~= nil then
		module:log("warn", "The 'no_daemonize' option is now replaced by 'daemonize'");
		module:log("warn", "Update your config from 'no_daemonize = %s' to 'daemonize = %s'", tostring(no_daemonize), tostring(daemonize));
	end
end

if daemonize then
	local function daemonize_server()
		local ok, ret = pposix.daemonize();
		if not ok then
			module:log("error", "Failed to daemonize: %s", ret);
		elseif ret and ret > 0 then
			os.exit(0);
		else
			module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
			write_pidfile();
		end
	end
	module:add_event_hook("server-starting", daemonize_server);
else
	-- Not going to daemonize, so write the pid of this process
	write_pidfile();
end

module:add_event_hook("server-stopped", remove_pidfile);

-- Set signal handlers
if signal.signal then
	signal.signal("SIGTERM", function ()
		module:log("warn", "Received SIGTERM");
		prosody.unlock_globals();
		prosody.shutdown("Received SIGTERM");
		prosody.lock_globals();
	end);

	signal.signal("SIGHUP", function ()
		module:log("info", "Received SIGHUP");
		prosody.reload_config();
		prosody.reopen_logfiles();
	end);
	
	signal.signal("SIGINT", function ()
		module:log("info", "Received SIGINT");
		prosody.unlock_globals();
		prosody.shutdown("Received SIGINT");
		prosody.lock_globals();
	end);
end