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 config_get = require "core.configmanager".get;
  21 local logger_set = require "util.logger".setwriter;
  22
  23 local prosody = _G.prosody;
  24
  25 module.host = "*"; -- we're a global module
  26
  27 -- Allow switching away from root, some people like strange ports.
  28 module:add_event_hook("server-started", function ()
  29                 local uid = config_get("*", "core", "setuid");
  30                 local gid = config_get("*", "core", "setgid");
  31                 if gid then
  32                         local success, msg = pposix.setgid(gid);
  33                         if success then
  34                                 module:log("debug", "Changed group to "..gid.." successfully.");
  35                         else
  36                                 module:log("error", "Failed to change group to "..gid..". Error: "..msg);
  37                                 prosody.shutdown("Failed to change group to "..gid);
  38                         end
  39                 end
  40                 if uid then
  41                         local success, msg = pposix.setuid(uid);
  42                         if success then
  43                                 module:log("debug", "Changed user to "..uid.." successfully.");
  44                         else
  45                                 module:log("error", "Failed to change user to "..uid..". Error: "..msg);
  46                                 prosody.shutdown("Failed to change user to "..uid);
  47                         end
  48                 end
  49         end);
  50
  51 -- Don't even think about it!
  52 module:add_event_hook("server-starting", function ()
  53                 local suid = config_get("*", "core", "setuid");
  54                 if not suid or suid == 0 or suid == "root" then
  55                         if pposix.getuid() == 0 and not config_get("*", "core", "run_as_root") then
  56                                 module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
  57                                 module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
  58                                 prosody.shutdown("Refusing to run as root");
  59                         end
  60                 end
  61         end);
  62
  63 local pidfile_written;
  64
  65 local function remove_pidfile()
  66         if pidfile_written then
  67                 os.remove(pidfile_written);
  68                 pidfile_written = nil;
  69         end
  70 end
  71
  72 local function write_pidfile()
  73         if pidfile_written then
  74                 remove_pidfile();
  75         end
  76         local pidfile = config_get("*", "core", "pidfile");
  77         if pidfile then
  78                 local pf, err = io.open(pidfile, "w+");
  79                 if not pf then
  80                         module:log("error", "Couldn't write pidfile; %s", err);
  81                 else
  82                         pf:write(tostring(pposix.getpid()));
  83                         pf:close();
  84                         pidfile_written = pidfile;
  85                 end
  86         end
  87 end
  88
  89 local syslog_opened
  90 function syslog_sink_maker(config)
  91         if not syslog_opened then
  92                 pposix.syslog_open("prosody");
  93                 syslog_opened = true;
  94         end
  95         local syslog, format = pposix.syslog_log, string.format;
  96         return function (name, level, message, ...)
  97                         if ... then
  98                                 syslog(level, format(message, ...));
  99                         else
 100                                 syslog(level, message);
 101                         end
 102                 end;
 103 end
 104 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
 105
 106 if not config_get("*", "core", "no_daemonize") then
 107         local function daemonize_server()
 108                 local ok, ret = pposix.daemonize();
 109                 if not ok then
 110                         module:log("error", "Failed to daemonize: %s", ret);
 111                 elseif ret and ret > 0 then
 112                         os.exit(0);
 113                 else
 114                         module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
 115                         write_pidfile();
 116                 end
 117         end
 118         module:add_event_hook("server-starting", daemonize_server);
 119 else
 120         -- Not going to daemonize, so write the pid of this process
 121         write_pidfile();
 122 end
 123
 124 module:add_event_hook("server-stopped", remove_pidfile);
 125
 126 -- Set signal handlers
 127 if signal.signal then
 128         signal.signal("SIGTERM", function ()
 129                 module:log("warn", "Received SIGTERM");
 130                 prosody.unlock_globals();
 131                 prosody.shutdown("Received SIGTERM");
 132                 prosody.lock_globals();
 133         end);
 134
 135         signal.signal("SIGHUP", function ()
 136                 module:log("info", "Received SIGHUP");
 137                 prosody.reload_config();
 138                 prosody.reopen_logfiles();
 139         end);
 140 end