util/dependencies.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 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 local function softreq(...) local ok, lib =  pcall(require, ...); if ok then return lib; else return nil, lib; end end
  10
  11 -- Required to be able to find packages installed with luarocks
  12 if not softreq "luarocks.loader" then -- LuaRocks 2.x
  13         softreq "luarocks.require"; -- LuaRocks <1.x
  14 end
  15
  16 local function missingdep(name, sources, msg)
  17         print("");
  18         print("**************************");
  19         print("Prosody was unable to find "..tostring(name));
  20         print("This package can be obtained in the following ways:");
  21         print("");
  22         local longest_platform = 0;
  23         for platform in pairs(sources) do
  24                 longest_platform = math.max(longest_platform, #platform);
  25         end
  26         for platform, source in pairs(sources) do
  27                 print("", platform..":"..(" "):rep(4+longest_platform-#platform)..source);
  28         end
  29         print("");
  30         print(msg or (name.." is required for Prosody to run, so we will now exit."));
  31         print("More help can be found on our website, at https://prosody.im/doc/depends");
  32         print("**************************");
  33         print("");
  34 end
  35
  36 local function check_dependencies()
  37         if _VERSION < "Lua 5.1" then
  38                 print "***********************************"
  39                 print("Unsupported Lua version: ".._VERSION);
  40                 print("At least Lua 5.1 is required.");
  41                 print "***********************************"
  42                 return false;
  43         end
  44
  45         local fatal;
  46
  47         local lxp = softreq "lxp"
  48
  49         if not lxp then
  50                 missingdep("luaexpat", {
  51                                 ["Debian/Ubuntu"] = "sudo apt-get install lua-expat";
  52                                 ["luarocks"] = "luarocks install luaexpat";
  53                                 ["Source"] = "http://matthewwild.co.uk/projects/luaexpat/";
  54                         });
  55                 fatal = true;
  56         end
  57
  58         local socket = softreq "socket"
  59
  60         if not socket then
  61                 missingdep("luasocket", {
  62                                 ["Debian/Ubuntu"] = "sudo apt-get install lua-socket";
  63                                 ["luarocks"] = "luarocks install luasocket";
  64                                 ["Source"] = "http://www.tecgraf.puc-rio.br/~diego/professional/luasocket/";
  65                         });
  66                 fatal = true;
  67         elseif not socket.tcp4 then
  68                 -- COMPAT LuaSocket before being IP-version agnostic
  69                 socket.tcp4 = socket.tcp;
  70                 socket.udp4 = socket.udp;
  71         end
  72
  73         local lfs, err = softreq "lfs"
  74         if not lfs then
  75                 missingdep("luafilesystem", {
  76                         ["luarocks"] = "luarocks install luafilesystem";
  77                         ["Debian/Ubuntu"] = "sudo apt-get install lua-filesystem";
  78                         ["Source"] = "http://www.keplerproject.org/luafilesystem/";
  79                 });
  80                 fatal = true;
  81         end
  82
  83         local ssl = softreq "ssl"
  84
  85         if not ssl then
  86                 missingdep("LuaSec", {
  87                                 ["Debian/Ubuntu"] = "sudo apt-get install lua-sec";
  88                                 ["luarocks"] = "luarocks install luasec";
  89                                 ["Source"] = "https://github.com/brunoos/luasec";
  90                         }, "SSL/TLS support will not be available");
  91         end
  92
  93         local bit = _G.bit32 or softreq"bit";
  94
  95         if not bit then
  96                 missingdep("lua-bitops", {
  97                         ["Debian/Ubuntu"] = "sudo apt-get install lua-bitop";
  98                         ["luarocks"] = "luarocks install luabitop";
  99                         ["Source"] = "http://bitop.luajit.org/";
 100                 }, "WebSocket support will not be available");
 101         end
 102
 103         local encodings, err = softreq "util.encodings"
 104         if not encodings then
 105                 if err:match("module '[^']*' not found") then
 106                         missingdep("util.encodings", {
 107                                 ["Windows"] = "Make sure you have encodings.dll from the Prosody distribution in util/";
 108                                 ["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/encodings.so";
 109                         });
 110                 else
 111                         print "***********************************"
 112                         print("util/encodings couldn't be loaded. Check that you have a recent version of libidn");
 113                         print ""
 114                         print("The full error was:");
 115                         print(err)
 116                         print "***********************************"
 117                 end
 118                 fatal = true;
 119         end
 120
 121         local hashes, err = softreq "util.hashes"
 122         if not hashes then
 123                 if err:match("module '[^']*' not found") then
 124                         missingdep("util.hashes", {
 125                                 ["Windows"] = "Make sure you have hashes.dll from the Prosody distribution in util/";
 126                                 ["GNU/Linux"] = "Run './configure' and 'make' in the Prosody source directory to build util/hashes.so";
 127                         });
 128                 else
 129                         print "***********************************"
 130                         print("util/hashes couldn't be loaded. Check that you have a recent version of OpenSSL (libcrypto in particular)");
 131                         print ""
 132                         print("The full error was:");
 133                         print(err)
 134                         print "***********************************"
 135                 end
 136                 fatal = true;
 137         end
 138
 139         return not fatal;
 140 end
 141
 142 local function log_warnings()
 143         if _VERSION > "Lua 5.2" then
 144                 prosody.log("warn", "Support for %s is experimental, please report any issues", _VERSION);
 145         end
 146         local ssl = softreq"ssl";
 147         if ssl then
 148                 local major, minor, veryminor, patched = ssl._VERSION:match("(%d+)%.(%d+)%.?(%d*)(M?)");
 149                 if not major or ((tonumber(major) == 0 and (tonumber(minor) or 0) <= 3 and (tonumber(veryminor) or 0) <= 2) and patched ~= "M") then
 150                         prosody.log("error", "This version of LuaSec contains a known bug that causes disconnects, see https://prosody.im/doc/depends");
 151                 end
 152         end
 153         local lxp = softreq"lxp";
 154         if lxp then
 155                 if not pcall(lxp.new, { StartDoctypeDecl = false }) then
 156                         prosody.log("error", "The version of LuaExpat on your system leaves Prosody "
 157                                 .."vulnerable to denial-of-service attacks. You should upgrade to "
 158                                 .."LuaExpat 1.3.0 or higher as soon as possible. See "
 159                                 .."https://prosody.im/doc/depends#luaexpat for more information.");
 160                 end
 161                 if not lxp.new({}).getcurrentbytecount then
 162                         prosody.log("error", "The version of LuaExpat on your system does not support "
 163                                 .."stanza size limits, which may leave servers on untrusted "
 164                                 .."networks (e.g. the internet) vulnerable to denial-of-service "
 165                                 .."attacks. You should upgrade to LuaExpat 1.3.0 or higher as "
 166                                 .."soon as possible. See "
 167                                 .."https://prosody.im/doc/depends#luaexpat for more information.");
 168                 end
 169         end
 170 end
 171
 172 return {
 173         softreq = softreq;
 174         missingdep = missingdep;
 175         check_dependencies = check_dependencies;
 176         log_warnings = log_warnings;
 177 };