plugins/mod_posix.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local want_pposix_version = "0.3.1";
  11
  12 local pposix = assert(require "util.pposix");
  13 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
  14
  15 local signal = select(2, pcall(require, "util.signal"));
  16 if type(signal) == "string" then
  17         module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
  18 end
  19
  20 local logger_set = require "util.logger".setwriter;
  21
  22 local prosody = _G.prosody;
  23
  24 module.host = "*"; -- we're a global module
  25
  26 -- Allow switching away from root, some people like strange ports.
  27 module:add_event_hook("server-started", function ()
  28                 local uid = module:get_option("setuid");
  29                 local gid = module:get_option("setgid");
  30                 if gid then
  31                         local success, msg = pposix.setgid(gid);
  32                         if success then
  33                                 module:log("debug", "Changed group to "..gid.." successfully.");
  34                         else
  35                                 module:log("error", "Failed to change group to "..gid..". Error: "..msg);
  36                                 prosody.shutdown("Failed to change group to "..gid);
  37                         end
  38                 end
  39                 if uid then
  40                         local success, msg = pposix.setuid(uid);
  41                         if success then
  42                                 module:log("debug", "Changed user to "..uid.." successfully.");
  43                         else
  44                                 module:log("error", "Failed to change user to "..uid..". Error: "..msg);
  45                                 prosody.shutdown("Failed to change user to "..uid);
  46                         end
  47                 end
  48         end);
  49
  50 -- Don't even think about it!
  51 module:add_event_hook("server-starting", function ()
  52                 local suid = module:get_option("setuid");
  53                 if not suid or suid == 0 or suid == "root" then
  54                         if pposix.getuid() == 0 and not module:get_option("run_as_root") then
  55                                 module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
  56                                 module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
  57                                 prosody.shutdown("Refusing to run as root");
  58                         end
  59                 end
  60         end);
  61
  62 local pidfile_written;
  63
  64 local function remove_pidfile()
  65         if pidfile_written then
  66                 os.remove(pidfile_written);
  67                 pidfile_written = nil;
  68         end
  69 end
  70
  71 local function write_pidfile()
  72         if pidfile_written then
  73                 remove_pidfile();
  74         end
  75         local pidfile = module:get_option("pidfile");
  76         if pidfile then
  77                 local pf, err = io.open(pidfile, "w+");
  78                 if not pf then
  79                         module:log("error", "Couldn't write pidfile; %s", err);
  80                 else
  81                         pf:write(tostring(pposix.getpid()));
  82                         pf:close();
  83                         pidfile_written = pidfile;
  84                 end
  85         end
  86 end
  87
  88 local syslog_opened
  89 function syslog_sink_maker(config)
  90         if not syslog_opened then
  91                 pposix.syslog_open("prosody");
  92                 syslog_opened = true;
  93         end
  94         local syslog, format = pposix.syslog_log, string.format;
  95         return function (name, level, message, ...)
  96                         if ... then
  97                                 syslog(level, format(message, ...));
  98                         else
  99                                 syslog(level, message);
 100                         end
 101                 end;
 102 end
 103 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
 104
 105 local daemonize = module:get_option("daemonize");
 106 if daemonize == nil then
 107         local no_daemonize = module:get_option("no_daemonize"); --COMPAT w/ 0.5
 108         daemonize = not no_daemonize;
 109         if no_daemonize ~= nil then
 110                 module:log("warn", "The 'no_daemonize' option is now replaced by 'daemonize'");
 111                 module:log("warn", "Update your config from 'no_daemonize = %s' to 'daemonize = %s'", tostring(no_daemonize), tostring(daemonize));
 112         end
 113 end
 114
 115 if daemonize then
 116         local function daemonize_server()
 117                 local ok, ret = pposix.daemonize();
 118                 if not ok then
 119                         module:log("error", "Failed to daemonize: %s", ret);
 120                 elseif ret and ret > 0 then
 121                         os.exit(0);
 122                 else
 123                         module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
 124                         write_pidfile();
 125                 end
 126         end
 127         module:add_event_hook("server-starting", daemonize_server);
 128 else
 129         -- Not going to daemonize, so write the pid of this process
 130         write_pidfile();
 131 end
 132
 133 module:add_event_hook("server-stopped", remove_pidfile);
 134
 135 -- Set signal handlers
 136 if signal.signal then
 137         signal.signal("SIGTERM", function ()
 138                 module:log("warn", "Received SIGTERM");
 139                 signal.signal("SIGTERM", function () end); -- Fixes us getting into some kind of loop
 140                 prosody.unlock_globals();
 141                 prosody.shutdown("Received SIGTERM");
 142                 prosody.lock_globals();
 143         end);
 144
 145         signal.signal("SIGHUP", function ()
 146                 module:log("info", "Received SIGHUP");
 147                 prosody.reload_config();
 148                 prosody.reopen_logfiles();
 149         end);
 150
 151         signal.signal("SIGINT", function ()
 152                 module:log("info", "Received SIGINT");
 153                 signal.signal("SIGINT", function () end); -- Fix to not loop
 154                 prosody.unlock_globals();
 155                 prosody.shutdown("Received SIGINT");
 156                 prosody.lock_globals();
 157         end);
 158 end