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plugins/mod_posix.lua @ 3342:20e99763a08a
util.caps: Entity capabilities hash generation (moved from mod_pep)
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 09 Jul 2010 13:18:42 +0100 |
parent | 3341:a8a3e662fea7 |
child | 3471:482275e38224 |
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-- Prosody IM -- Copyright (C) 2008-2010 Matthew Wild -- Copyright (C) 2008-2010 Waqas Hussain -- -- This project is MIT/X11 licensed. Please see the -- COPYING file in the source package for more information. -- local want_pposix_version = "0.3.3"; 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 lfs = require "lfs"; local stat = lfs.attributes; local prosody = _G.prosody; module.host = "*"; -- we're a global module local umask = module:get_option("umask") or "027"; pposix.umask(umask); -- 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! if not prosody.start_time then -- server-starting 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; local pidfile_handle; local function remove_pidfile() if pidfile_handle then pidfile_handle:close(); os.remove(pidfile); pidfile, pidfile_handle = nil, nil; end end local function write_pidfile() if pidfile_handle then remove_pidfile(); end pidfile = module:get_option("pidfile"); if pidfile then local err; local mode = stat(pidfile) and "r+" or "w+"; pidfile_handle, err = io.open(pidfile, mode); if not pidfile_handle then module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err); prosody.shutdown("Couldn't write pidfile"); else if not lfs.lock(pidfile_handle, "w") then -- Exclusive lock local other_pid = pidfile_handle:read("*a"); module:log("error", "Another Prosody instance seems to be running with PID %s, quitting", other_pid); pidfile_handle = nil; prosody.shutdown("Prosody already running"); else pidfile_handle:close(); pidfile_handle, err = io.open(pidfile, "w+"); if not pidfile_handle then module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err); prosody.shutdown("Couldn't write pidfile"); else if lfs.lock(pidfile_handle, "w") then pidfile_handle:write(tostring(pposix.getpid())); pidfile_handle:flush(); end end end 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 if not prosody.start_time then -- server-starting daemonize_server(); end 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