prosody
08892e3f24bd
plugins/mod_posix.lua

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plugins/mod_posix.lua @ 2793:08892e3f24bd

mod_posix: Lock pidfile when in use, shut down if we can't write or lock the pidfile
author Matthew Wild <mwild1@gmail.com>
date Sun, 10 Jan 2010 23:49:38 +0000
parent 2074:c59c8f3ec645
child 2795:d6fcd13c07e7
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1522
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9
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10 local want_pposix_version = "0.3.1";
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11
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12 local pposix = assert(require "util.pposix");
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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
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14
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15 local signal = select(2, pcall(require, "util.signal"));
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16 if type(signal) == "string" then
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17 module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");
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18 end
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19
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20 local logger_set = require "util.logger".setwriter;
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21
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22 local lfs = require "lfs";
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23
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24 local prosody = _G.prosody;
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25
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26 module.host = "*"; -- we're a global module
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27
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28 -- Allow switching away from root, some people like strange ports.
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29 module:add_event_hook("server-started", function ()
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30 local uid = module:get_option("setuid");
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31 local gid = module:get_option("setgid");
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32 if gid then
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33 local success, msg = pposix.setgid(gid);
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34 if success then
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35 module:log("debug", "Changed group to "..gid.." successfully.");
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36 else
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37 module:log("error", "Failed to change group to "..gid..". Error: "..msg);
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38 prosody.shutdown("Failed to change group to "..gid);
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39 end
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40 end
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41 if uid then
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42 local success, msg = pposix.setuid(uid);
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43 if success then
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44 module:log("debug", "Changed user to "..uid.." successfully.");
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45 else
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46 module:log("error", "Failed to change user to "..uid..". Error: "..msg);
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47 prosody.shutdown("Failed to change user to "..uid);
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48 end
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49 end
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50 end);
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51
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52 -- Don't even think about it!
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53 module:add_event_hook("server-starting", function ()
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54 local suid = module:get_option("setuid");
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55 if not suid or suid == 0 or suid == "root" then
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56 if pposix.getuid() == 0 and not module:get_option("run_as_root") then
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57 module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");
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58 module:log("error", "For more information on running Prosody as root, see http://prosody.im/doc/root");
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59 prosody.shutdown("Refusing to run as root");
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60 end
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61 end
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62 end);
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63
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64 local pidfile;
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65 local pidfile_handle;
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66
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67 local function remove_pidfile()
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68 if pidfile_handle then
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69 pidfile_handle:close();
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70 os.remove(pidfile);
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71 pidfile, pidfile_handle = nil, nil;
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72 end
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73 end
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74
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75 local function write_pidfile()
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76 if pidfile_handle then
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77 remove_pidfile();
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78 end
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79 pidfile = module:get_option("pidfile");
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80 if pidfile then
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81 pidfile_handle, err = io.open(pidfile, "a+");
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82 if not pidfile_handle then
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83 module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err);
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84 prosody.shutdown("Couldn't write pidfile");
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85 else
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86 if not lfs.lock(pidfile_handle, "w") then -- Exclusive lock
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87 local other_pid = pidfile_handle:read("*a");
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88 module:log("error", "Another Prosody instance seems to be running with PID %s, quitting", other_pid);
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89 pidfile_handle = nil;
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90 prosody.shutdown("Prosody already running");
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91 else
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92 pidfile_handle:write(tostring(pposix.getpid()));
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93 pidfile_handle:flush();
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94 end
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95 end
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96 end
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97 end
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98
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99 local syslog_opened
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100 function syslog_sink_maker(config)
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101 if not syslog_opened then
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102 pposix.syslog_open("prosody");
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103 syslog_opened = true;
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104 end
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105 local syslog, format = pposix.syslog_log, string.format;
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106 return function (name, level, message, ...)
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107 if ... then
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108 syslog(level, format(message, ...));
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109 else
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110 syslog(level, message);
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111 end
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112 end;
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113 end
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114 require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);
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115
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116 local daemonize = module:get_option("daemonize");
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117 if daemonize == nil then
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118 local no_daemonize = module:get_option("no_daemonize"); --COMPAT w/ 0.5
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119 daemonize = not no_daemonize;
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120 if no_daemonize ~= nil then
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121 module:log("warn", "The 'no_daemonize' option is now replaced by 'daemonize'");
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122 module:log("warn", "Update your config from 'no_daemonize = %s' to 'daemonize = %s'", tostring(no_daemonize), tostring(daemonize));
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123 end
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parents: 1712
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124 end
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parents: 1712
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125
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126 if daemonize then
587
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parents:
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127 local function daemonize_server()
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128 local ok, ret = pposix.daemonize();
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129 if not ok then
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130 module:log("error", "Failed to daemonize: %s", ret);
587
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131 elseif ret and ret > 0 then
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132 os.exit(0);
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133 else
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134 module:log("info", "Successfully daemonized to PID %d", pposix.getpid());
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
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parents: 735
diff changeset
135 write_pidfile();
587
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136 end
43f509a1519a Add mod_posix, fixes #5
Matthew Wild <mwild1@gmail.com>
parents:
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137 end
43f509a1519a Add mod_posix, fixes #5
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138 module:add_event_hook("server-starting", daemonize_server);
991
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parents: 735
diff changeset
139 else
1032
409f22d0430f mod_posix: Remove pidfile on exit
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parents: 991
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140 -- Not going to daemonize, so write the pid of this process
991
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parents: 735
diff changeset
141 write_pidfile();
587
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142 end
991
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parents: 735
diff changeset
143
1032
409f22d0430f mod_posix: Remove pidfile on exit
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parents: 991
diff changeset
144 module:add_event_hook("server-stopped", remove_pidfile);
409f22d0430f mod_posix: Remove pidfile on exit
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parents: 991
diff changeset
145
1118
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parents: 1092
diff changeset
146 -- Set signal handlers
991
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parents: 735
diff changeset
147 if signal.signal then
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diff changeset
148 signal.signal("SIGTERM", function ()
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parents: 1092
diff changeset
149 module:log("warn", "Received SIGTERM");
1238
f4c08caca3e7 mod_posix: Use global prosody object
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parents: 1119
diff changeset
150 prosody.unlock_globals();
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parents: 1119
diff changeset
151 prosody.shutdown("Received SIGTERM");
f4c08caca3e7 mod_posix: Use global prosody object
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parents: 1119
diff changeset
152 prosody.lock_globals();
991
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parents: 735
diff changeset
153 end);
1118
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Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
154
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
Matthew Wild <mwild1@gmail.com>
parents: 1092
diff changeset
155 signal.signal("SIGHUP", function ()
239d4362a040 mod_posix: Reload the config and reopen log files on SIGHUP
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parents: 1092
diff changeset
156 module:log("info", "Received SIGHUP");
1238
f4c08caca3e7 mod_posix: Use global prosody object
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parents: 1119
diff changeset
157 prosody.reload_config();
f4c08caca3e7 mod_posix: Use global prosody object
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parents: 1119
diff changeset
158 prosody.reopen_logfiles();
1118
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parents: 1092
diff changeset
159 end);
991
cd0d75de8345 mod_posix: Allow logging and pidfile options to take effect without needing to daemonize. Add the ability to catch SIGTERM.
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parents: 735
diff changeset
160 end