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 "inspircd_io.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 #ifdef STATIC_LINK
  41         this->staticname[0] = '\0';
  42         log(DEBUG,"Loading core-compiled module '%s'",fname);
  43         for (int j = 0; modsyms[j].name; j++)
  44         {
  45                 log(DEBUG,"Check %s",modsyms[j].name);
  46                 if (!strcmp(modsyms[j].name,fname))
  47                 {
  48                         log(DEBUG,"Found %s",fname);
  49                         strlcpy(this->staticname,fname,1020);
  50                         err = 0;
  51                         return;
  52                 }
  53         }
  54         err = "Module is not statically compiled into the ircd";
  55 #else
  56         // Copy the library to a temp location, this makes recompiles
  57         // a little safer if the ircd is running at the time as the
  58         // shared libraries are mmap()ed and not doing this causes
  59         // segfaults.
  60         FILE* x = fopen(fname,"rb");
  61         char tmpfile_template[255];
  62         char buffer[65536];
  63         snprintf(tmpfile_template, 255, "/tmp/inspircd_file.so.%d.XXXXXXXXXX",getpid());
  64         int fd = mkstemp(tmpfile_template);
  65         while (!feof(x))
  66         {
  67                 int n = fread(buffer, 1, 65535, x);
  68                 if (n)
  69                         write(fd,buffer,n);
  70         }
  71
  72         // Try to open the library now and get any error message.
  73
  74         h = dlopen(tmpfile_template, RTLD_NOW );
  75         err = (char*)dlerror();
  76         close(fd);
  77         // We can delete the tempfile once it's loaded, leaving just the inode.
  78         if (!Config->debugging)
  79                 unlink(tmpfile_template);
  80 #endif
  81 }
  82
  83 DLLManager::~DLLManager()
  84 {
  85 #ifndef STATIC_LINK
  86         // close the library if it isn't null
  87         if (h != 0)
  88         dlclose(h);
  89 #endif
  90 }
  91
  92
  93
  94 #ifdef STATIC_LINK
  95
  96 bool DLLManager::GetSymbol(initfunc* &v, char *sym_name)
  97 {
  98         log(DEBUG,"Symbol search...");
  99         for (int j = 0; modsyms[j].name; j++)
 100         {
 101                 if (!strcmp(this->staticname,modsyms[j].name))
 102                 {
 103                         log(DEBUG,"Loading symbol...");
 104                         v = modsyms[j].value;
 105                         err = 0;
 106                         return true;
 107                 }
 108         }
 109         err = "Module symbol missing from the core";
 110         return false;
 111 }
 112
 113 #else
 114
 115 bool DLLManager::GetSymbol(void **v, char *sym_name)
 116 {
 117         // try extract a symbol from the library
 118         // get any error message is there is any
 119
 120         if(h != 0)
 121         {
 122                 *v = dlsym( h, sym_name );
 123                 err = (char*)dlerror();
 124                 if( err == 0 )
 125                         return true;
 126                 else
 127                         return false;
 128         }
 129         else
 130         {
 131                 return false;
 132         }
 133 }
 134
 135 #endif
 136
 137 DLLFactoryBase::DLLFactoryBase(char *fname, char *factory) : DLLManager(fname)
 138 {
 139         // try get the factory function if there is no error yet
 140
 141         factory_func = 0;
 142
 143         if(LastError() == 0)
 144         {
 145 #ifdef STATIC_LINK
 146                 GetSymbol( factory_func, factory ? factory : (char*)"init_module" );
 147 #else
 148                 GetSymbol( (void **)&factory_func, factory ? factory : (char*)"init_module" );
 149 #endif
 150         }
 151 }
 152
 153
 154 DLLFactoryBase::~DLLFactoryBase()
 155 {
 156 }