src/dynamic.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "configreader.h"
  15 #include "dynamic.h"
  16
  17 #ifndef STATIC_LINK
  18 #include <dlfcn.h>
  19 #else
  20 #include "modlist.h"
  21 #endif
  22
  23 #include "inspircd.h"
  24
  25 DLLManager::DLLManager(InspIRCd* ServerInstance, const char *fname)
  26 {
  27         err = NULL;
  28
  29         if (!strstr(fname,".so"))
  30         {
  31                 err = "This doesn't look like a module file to me...";
  32                 return;
  33         }
  34 #ifdef STATIC_LINK
  35         this->staticname[0] = '\0';
  36         ServerInstance->Log(DEBUG,"Loading core-compiled module '%s'",fname);
  37         for (int j = 0; modsyms[j].name; j++)
  38         {
  39                 ServerInstance->Log(DEBUG,"Check %s",modsyms[j].name);
  40                 if (!strcmp(modsyms[j].name,fname))
  41                 {
  42                         ServerInstance->Log(DEBUG,"Found %s",fname);
  43                         strlcpy(this->staticname,fname,1020);
  44                         err = 0;
  45                         return;
  46                 }
  47         }
  48         err = "Module is not statically compiled into the ircd";
  49 #else
  50         h = dlopen(fname, RTLD_NOW|RTLD_LOCAL);
  51         if (!h)
  52         {
  53                 err = (char*)dlerror();
  54                 ServerInstance->Log(DEBUG,"dlerror '%s' occured!", err);
  55                 return;
  56         }
  57
  58         ServerInstance->Log(DEBUG,"Finished loading '%s': %0x", fname, h);
  59 #endif
  60 }
  61
  62 DLLManager::~DLLManager()
  63 {
  64 #ifndef STATIC_LINK
  65         // close the library if it isn't null
  66         if (h)
  67                 dlclose(h);
  68 #endif
  69 }
  70
  71
  72
  73 #ifdef STATIC_LINK
  74
  75 bool DLLManager::GetSymbol(initfunc* &v, const char *sym_name)
  76 {
  77         for (int j = 0; modsyms[j].name; j++)
  78         {
  79                 if (!strcmp(this->staticname,modsyms[j].name))
  80                 {
  81                         v = modsyms[j].value;
  82                         err = 0;
  83                         return true;
  84                 }
  85         }
  86         err = "Module symbol missing from the core";
  87         return false;
  88 }
  89
  90 #else
  91
  92 bool DLLManager::GetSymbol(void** v, const char* sym_name)
  93 {
  94         // try extract a symbol from the library
  95         // get any error message is there is any
  96
  97         if (h)
  98         {
  99                 dlerror(); // clear value
 100                 *v = dlsym(h, sym_name);
 101                 err = (char*)dlerror();
 102                 if (!*v || err)
 103                         return false;
 104         }
 105
 106         if (err)
 107         {
 108                 return false;
 109         }
 110         else
 111         {
 112                 return true;
 113         }
 114 }
 115
 116 #endif
 117
 118 DLLFactoryBase::DLLFactoryBase(InspIRCd* Instance, const char* fname, const char* symbol) : DLLManager(Instance, fname)
 119 {
 120         // try get the factory function if there is no error yet
 121         factory_func = 0;
 122
 123         if (!LastError())
 124         {
 125 #ifdef STATIC_LINK
 126                 if (!GetSymbol( factory_func, symbol ? symbol : "init_module"))
 127 #else
 128                 if (!GetSymbol( (void **)&factory_func, symbol ? symbol : "init_module"))
 129 #endif
 130                 {
 131                         throw ModuleException("Missing init_module() entrypoint!");
 132                 }
 133         }
 134 }
 135
 136 DLLFactoryBase::~DLLFactoryBase()
 137 {
 138 }
 139