src/dynamic.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 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 "globals.h"
  21 #include "dynamic.h"
  22
  23 #ifndef STATIC_LINK
  24 #include <dlfcn.h>
  25 #else
  26 #include "modlist.h"
  27 #endif
  28
  29 #include "inspstring.h"
  30 #include "helperfuncs.h"
  31 #include <unistd.h>
  32 #include <sys/types.h>
  33 #include <stdio.h>
  34
  35 DLLManager::DLLManager(char *fname)
  36 {
  37 #ifdef STATIC_LINK
  38         this->staticname[0] = '\0';
  39         log(DEBUG,"Loading core-compiled module '%s'",fname);
  40         for (int j = 0; modsyms[j].name; j++)
  41         {
  42                 log(DEBUG,"Check %s",modsyms[j].name);
  43                 if (!strcmp(modsyms[j].name,fname))
  44                 {
  45                         log(DEBUG,"Found %s",fname);
  46                         strlcpy(this->staticname,fname,1020);
  47                         err = 0;
  48                         return;
  49                 }
  50         }
  51         err = "Module is not statically compiled into the ircd";
  52 #else
  53         // Copy the library to a temp location, this makes recompiles
  54         // a little safer if the ircd is running at the time as the
  55         // shared libraries are mmap()ed and not doing this causes
  56         // segfaults.
  57         FILE* x = fopen(fname,"rb");
  58         char tmpfile_template[255];
  59         char buffer[65536];
  60         snprintf(tmpfile_template, 255, "/tmp/inspircd_file.so.%d.XXXXXXXXXX",getpid());
  61         int fd = mkstemp(tmpfile_template);
  62         while (!feof(x))
  63         {
  64                 int n = fread(buffer, 1, 65535, x);
  65                 if (n)
  66                         write(fd,buffer,n);
  67         }
  68
  69         // Try to open the library now and get any error message.
  70
  71         h = dlopen(tmpfile_template, RTLD_NOW );
  72         err = (char*)dlerror();
  73         close(fd);
  74 #endif
  75 }
  76
  77 DLLManager::~DLLManager()
  78 {
  79 #ifndef STATIC_LINK
  80         // close the library if it isn't null
  81         if (h != 0)
  82         dlclose(h);
  83 #endif
  84 }
  85
  86
  87
  88 #ifdef STATIC_LINK
  89
  90 bool DLLManager::GetSymbol(initfunc* &v, char *sym_name)
  91 {
  92         log(DEBUG,"Symbol search...");
  93         for (int j = 0; modsyms[j].name; j++)
  94         {
  95                 if (!strcmp(this->staticname,modsyms[j].name))
  96                 {
  97                         log(DEBUG,"Loading symbol...");
  98                         v = modsyms[j].value;
  99                         err = 0;
 100                         return true;
 101                 }
 102         }
 103         err = "Module symbol missing from the core";
 104         return false;
 105 }
 106
 107 #else
 108
 109 bool DLLManager::GetSymbol(void **v, char *sym_name)
 110 {
 111         // try extract a symbol from the library
 112         // get any error message is there is any
 113
 114         if(h != 0)
 115         {
 116                 *v = dlsym( h, sym_name );
 117                 err = (char*)dlerror();
 118                 if( err == 0 )
 119                         return true;
 120                 else
 121                         return false;
 122         }
 123         else
 124         {
 125                 return false;
 126         }
 127 }
 128
 129 #endif
 130
 131 DLLFactoryBase::DLLFactoryBase(char *fname, char *factory) : DLLManager(fname)
 132 {
 133         // try get the factory function if there is no error yet
 134
 135         factory_func = 0;
 136
 137         if(LastError() == 0)
 138         {
 139 #ifdef STATIC_LINK
 140                 GetSymbol( factory_func, factory ? factory : (char*)"init_module" );
 141 #else
 142                 GetSymbol( (void **)&factory_func, factory ? factory : (char*)"init_module" );
 143 #endif
 144         }
 145 }
 146
 147
 148 DLLFactoryBase::~DLLFactoryBase()
 149 {
 150 }