src/dynamic.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include "configreader.h"
  21 #include "globals.h"
  22 #include "dynamic.h"
  23
  24 #ifndef STATIC_LINK
  25 #include <dlfcn.h>
  26 #else
  27 #include "modlist.h"
  28 #endif
  29
  30 #include "inspstring.h"
  31 #include "helperfuncs.h"
  32 #include <unistd.h>
  33 #include <sys/types.h>
  34 #include <stdio.h>
  35
  36 extern ServerConfig* Config;
  37
  38 DLLManager::DLLManager(char *fname)
  39 {
  40         err = NULL;
  41
  42         if (!strstr(fname,".so"))
  43         {
  44                 err = "This doesn't look like a module file to me...";
  45                 return;
  46         }
  47 #ifdef STATIC_LINK
  48         this->staticname[0] = '\0';
  49         log(DEBUG,"Loading core-compiled module '%s'",fname);
  50         for (int j = 0; modsyms[j].name; j++)
  51         {
  52                 log(DEBUG,"Check %s",modsyms[j].name);
  53                 if (!strcmp(modsyms[j].name,fname))
  54                 {
  55                         log(DEBUG,"Found %s",fname);
  56                         strlcpy(this->staticname,fname,1020);
  57                         err = 0;
  58                         return;
  59                 }
  60         }
  61         err = "Module is not statically compiled into the ircd";
  62 #else
  63         // Copy the library to a temp location, this makes recompiles
  64         // a little safer if the ircd is running at the time as the
  65         // shared libraries are mmap()ed and not doing this causes
  66         // segfaults.
  67         FILE* x = fopen(fname,"rb");
  68         if (!x)
  69         {
  70                 err = "Module file not found or cannot access, game over man!";
  71                 return;
  72         }
  73         char tmpfile_template[255];
  74         char buffer[65536];
  75         snprintf(tmpfile_template, 255, "%s/inspircd_file.so.%d.XXXXXXXXXX",Config->TempDir,getpid());
  76         int fd = mkstemp(tmpfile_template);
  77         if (fd == -1)
  78         {
  79                 fclose(x);
  80                 err = strerror(errno);
  81                 return;
  82         }
  83         while (!feof(x))
  84         {
  85                 int n = fread(buffer, 1, 65535, x);
  86                 if (n)
  87                 {
  88                         int written = write(fd,buffer,n);
  89                         if (written != n)
  90                         {
  91                                 fclose(x);
  92                                 err = strerror(errno);
  93                                 return;
  94                         }
  95                 }
  96         }
  97         // Try to open the library now and get any error message.
  98
  99         h = dlopen(tmpfile_template, RTLD_NOW );
 100         err = (char*)dlerror();
 101         close(fd);
 102         fclose(x);
 103         // We can delete the tempfile once it's loaded, leaving just the inode.
 104         if (!Config->debugging)
 105                 unlink(tmpfile_template);
 106 #endif
 107 }
 108
 109 DLLManager::~DLLManager()
 110 {
 111 #ifndef STATIC_LINK
 112         // close the library if it isn't null
 113         if (h != 0)
 114         dlclose(h);
 115 #endif
 116 }
 117
 118
 119
 120 #ifdef STATIC_LINK
 121
 122 bool DLLManager::GetSymbol(initfunc* &v, char *sym_name)
 123 {
 124         log(DEBUG,"Symbol search...");
 125         for (int j = 0; modsyms[j].name; j++)
 126         {
 127                 if (!strcmp(this->staticname,modsyms[j].name))
 128                 {
 129                         log(DEBUG,"Loading symbol...");
 130                         v = modsyms[j].value;
 131                         err = 0;
 132                         return true;
 133                 }
 134         }
 135         err = "Module symbol missing from the core";
 136         return false;
 137 }
 138
 139 #else
 140
 141 bool DLLManager::GetSymbol(void **v, char *sym_name)
 142 {
 143         // try extract a symbol from the library
 144         // get any error message is there is any
 145
 146         if(h != 0)
 147         {
 148                 *v = dlsym( h, sym_name );
 149                 err = (char*)dlerror();
 150                 if( err == 0 )
 151                         return true;
 152                 else
 153                         return false;
 154         }
 155         else
 156         {
 157                 return false;
 158         }
 159 }
 160
 161 #endif
 162
 163 DLLFactoryBase::DLLFactoryBase(char *fname, char *factory) : DLLManager(fname)
 164 {
 165         // try get the factory function if there is no error yet
 166
 167         factory_func = 0;
 168
 169         if(LastError() == 0)
 170         {
 171 #ifdef STATIC_LINK
 172                 GetSymbol( factory_func, factory ? factory : (char*)"init_module" );
 173 #else
 174                 GetSymbol( (void **)&factory_func, factory ? factory : (char*)"init_module" );
 175 #endif
 176         }
 177 }
 178
 179
 180 DLLFactoryBase::~DLLFactoryBase()
 181 {
 182 }