src/modmanager_dynamic.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *
   6  * This file is part of InspIRCd.  InspIRCd is free software: you can
   7  * redistribute it and/or modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation, version 2.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  12  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  13  * details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include "inspircd.h"
  21 #include "xline.h"
  22 #include "socket.h"
  23 #include "socketengine.h"
  24 #include "command_parse.h"
  25 #include "dns.h"
  26 #include "exitcodes.h"
  27
  28 #ifndef _WIN32
  29 #include <dirent.h>
  30 #endif
  31
  32 #ifndef PURE_STATIC
  33
  34 bool ModuleManager::Load(const std::string& filename, bool defer)
  35 {
  36         /* Don't allow people to specify paths for modules, it doesn't work as expected */
  37         if (filename.find('/') != std::string::npos)
  38                 return false;
  39
  40         char modfile[MAXBUF];
  41         snprintf(modfile,MAXBUF,"%s/%s",ServerInstance->Config->ModPath.c_str(),filename.c_str());
  42
  43         if (!ServerConfig::FileExists(modfile))
  44         {
  45                 LastModuleError = "Module file could not be found: " + filename;
  46                 ServerInstance->Logs->Log("MODULE", DEFAULT, LastModuleError);
  47                 return false;
  48         }
  49
  50         if (Modules.find(filename) != Modules.end())
  51         {
  52                 LastModuleError = "Module " + filename + " is already loaded, cannot load a module twice!";
  53                 ServerInstance->Logs->Log("MODULE", DEFAULT, LastModuleError);
  54                 return false;
  55         }
  56
  57         Module* newmod = NULL;
  58         DLLManager* newhandle = new DLLManager(modfile);
  59
  60         try
  61         {
  62                 newmod = newhandle->CallInit();
  63
  64                 if (newmod)
  65                 {
  66                         newmod->ModuleSourceFile = filename;
  67                         newmod->ModuleDLLManager = newhandle;
  68                         Modules[filename] = newmod;
  69                         std::string version = newhandle->GetVersion();
  70                         if (defer)
  71                         {
  72                                 ServerInstance->Logs->Log("MODULE", DEFAULT,"New module introduced: %s (Module version %s)",
  73                                         filename.c_str(), version.c_str());
  74                         }
  75                         else
  76                         {
  77                                 newmod->init();
  78
  79                                 Version v = newmod->GetVersion();
  80                                 ServerInstance->Logs->Log("MODULE", DEFAULT,"New module introduced: %s (Module version %s)%s",
  81                                         filename.c_str(), version.c_str(), (!(v.Flags & VF_VENDOR) ? " [3rd Party]" : " [Vendor]"));
  82                         }
  83                 }
  84                 else
  85                 {
  86                         LastModuleError = "Unable to load " + filename + ": " + newhandle->LastError();
  87                         ServerInstance->Logs->Log("MODULE", DEFAULT, LastModuleError);
  88                         delete newhandle;
  89                         return false;
  90                 }
  91         }
  92         catch (CoreException& modexcept)
  93         {
  94                 // failure in module constructor
  95                 if (newmod)
  96                         DoSafeUnload(newmod);
  97                 else
  98                         delete newhandle;
  99                 LastModuleError = "Unable to load " + filename + ": " + modexcept.GetReason();
 100                 ServerInstance->Logs->Log("MODULE", DEFAULT, LastModuleError);
 101                 return false;
 102         }
 103
 104         this->ModCount++;
 105         if (defer)
 106                 return true;
 107
 108         FOREACH_MOD(I_OnLoadModule,OnLoadModule(newmod));
 109         /* We give every module a chance to re-prioritize when we introduce a new one,
 110          * not just the one thats loading, as the new module could affect the preference
 111          * of others
 112          */
 113         for(int tries = 0; tries < 20; tries++)
 114         {
 115                 prioritizationState = tries > 0 ? PRIO_STATE_LAST : PRIO_STATE_FIRST;
 116                 for (std::map<std::string, Module*>::iterator n = Modules.begin(); n != Modules.end(); ++n)
 117                         n->second->Prioritize();
 118
 119                 if (prioritizationState == PRIO_STATE_LAST)
 120                         break;
 121                 if (tries == 19)
 122                         ServerInstance->Logs->Log("MODULE", DEFAULT, "Hook priority dependency loop detected while loading " + filename);
 123         }
 124
 125         ServerInstance->BuildISupport();
 126         return true;
 127 }
 128
 129 namespace {
 130         struct UnloadAction : public HandlerBase0<void>
 131         {
 132                 Module* const mod;
 133                 UnloadAction(Module* m) : mod(m) {}
 134                 void Call()
 135                 {
 136                         DLLManager* dll = mod->ModuleDLLManager;
 137                         ServerInstance->Modules->DoSafeUnload(mod);
 138                         ServerInstance->GlobalCulls.Apply();
 139                         delete dll;
 140                         ServerInstance->GlobalCulls.AddItem(this);
 141                 }
 142         };
 143
 144         struct ReloadAction : public HandlerBase0<void>
 145         {
 146                 Module* const mod;
 147                 HandlerBase1<void, bool>* const callback;
 148                 ReloadAction(Module* m, HandlerBase1<void, bool>* c)
 149                         : mod(m), callback(c) {}
 150                 void Call()
 151                 {
 152                         DLLManager* dll = mod->ModuleDLLManager;
 153                         std::string name = mod->ModuleSourceFile;
 154                         ServerInstance->Modules->DoSafeUnload(mod);
 155                         ServerInstance->GlobalCulls.Apply();
 156                         delete dll;
 157                         bool rv = ServerInstance->Modules->Load(name.c_str());
 158                         if (callback)
 159                                 callback->Call(rv);
 160                         ServerInstance->GlobalCulls.AddItem(this);
 161                 }
 162         };
 163 }
 164
 165 bool ModuleManager::Unload(Module* mod)
 166 {
 167         if (!CanUnload(mod))
 168                 return false;
 169         ServerInstance->AtomicActions.AddAction(new UnloadAction(mod));
 170         return true;
 171 }
 172
 173 void ModuleManager::Reload(Module* mod, HandlerBase1<void, bool>* callback)
 174 {
 175         if (CanUnload(mod))
 176                 ServerInstance->AtomicActions.AddAction(new ReloadAction(mod, callback));
 177         else
 178                 callback->Call(false);
 179 }
 180
 181 /* We must load the modules AFTER initializing the socket engine, now */
 182 void ModuleManager::LoadAll()
 183 {
 184         ModCount = 0;
 185
 186         printf("\nLoading core commands");
 187         fflush(stdout);
 188
 189         DIR* library = opendir(ServerInstance->Config->ModPath.c_str());
 190         if (library)
 191         {
 192                 dirent* entry = NULL;
 193                 while (0 != (entry = readdir(library)))
 194                 {
 195                         if (InspIRCd::Match(entry->d_name, "cmd_*.so", ascii_case_insensitive_map))
 196                         {
 197                                 printf(".");
 198                                 fflush(stdout);
 199
 200                                 if (!Load(entry->d_name, true))
 201                                 {
 202                                         ServerInstance->Logs->Log("MODULE", DEFAULT, this->LastError());
 203                                         printf_c("\n[\033[1;31m*\033[0m] %s\n\n", this->LastError().c_str());
 204                                         ServerInstance->Exit(EXIT_STATUS_MODULE);
 205                                 }
 206                         }
 207                 }
 208                 closedir(library);
 209                 printf("\n");
 210         }
 211
 212         ConfigTagList tags = ServerInstance->Config->ConfTags("module");
 213         for(ConfigIter i = tags.first; i != tags.second; ++i)
 214         {
 215                 ConfigTag* tag = i->second;
 216                 std::string name = tag->getString("name");
 217                 printf_c("[\033[1;32m*\033[0m] Loading module:\t\033[1;32m%s\033[0m\n",name.c_str());
 218
 219                 if (!this->Load(name, true))
 220                 {
 221                         ServerInstance->Logs->Log("MODULE", DEFAULT, this->LastError());
 222                         printf_c("\n[\033[1;31m*\033[0m] %s\n\n", this->LastError().c_str());
 223                         ServerInstance->Exit(EXIT_STATUS_MODULE);
 224                 }
 225         }
 226
 227         for(std::map<std::string, Module*>::iterator i = Modules.begin(); i != Modules.end(); i++)
 228         {
 229                 Module* mod = i->second;
 230                 try
 231                 {
 232                         ServerInstance->Logs->Log("MODULE", DEBUG, "Initializing %s", i->first.c_str());
 233                         mod->init();
 234                 }
 235                 catch (CoreException& modexcept)
 236                 {
 237                         LastModuleError = "Unable to initialize " + mod->ModuleSourceFile + ": " + modexcept.GetReason();
 238                         ServerInstance->Logs->Log("MODULE", DEFAULT, LastModuleError);
 239                         printf_c("\n[\033[1;31m*\033[0m] %s\n\n", LastModuleError.c_str());
 240                         ServerInstance->Exit(EXIT_STATUS_MODULE);
 241                 }
 242         }
 243
 244         /* We give every module a chance to re-prioritize when we introduce a new one,
 245          * not just the one thats loading, as the new module could affect the preference
 246          * of others
 247          */
 248         for(int tries = 0; tries < 20; tries++)
 249         {
 250                 prioritizationState = tries > 0 ? PRIO_STATE_LAST : PRIO_STATE_FIRST;
 251                 for (std::map<std::string, Module*>::iterator n = Modules.begin(); n != Modules.end(); ++n)
 252                         n->second->Prioritize();
 253
 254                 if (prioritizationState == PRIO_STATE_LAST)
 255                         break;
 256                 if (tries == 19)
 257                 {
 258                         ServerInstance->Logs->Log("MODULE", DEFAULT, "Hook priority dependency loop detected");
 259                         ServerInstance->Exit(EXIT_STATUS_MODULE);
 260                 }
 261         }
 262 }
 263
 264 #endif