ircd-hybrid/src/dynlink.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  dynlink.c: A module loader.
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 *
 * $Id$
 *
 */
#include "stdinc.h"
#include "modules.h"
#include "client.h"
#include "send.h"

#ifndef RTLD_NOW
#define RTLD_NOW RTLD_LAZY /* openbsd deficiency */
#endif

extern dlink_list mod_list;

static char unknown_ver[] = "<unknown>";

/* This file contains the core functions to use dynamic libraries.
 * -TimeMr14C
 */

#if !defined(HAVE_SHL_LOAD) && !defined(HAVE_DLFUNC)
/*
 * Fake dlfunc(3) if we don't have it, cause it's happy.
 */
typedef void (*__function_p)(void);

static __function_p
dlfunc(void *myHandle, const char *functionName)
{
  /* XXX This is not guaranteed to work, but with
   * traditional dl*(3), it is the best we can do.
   * -jmallett
   */
  void *symbolp;

  symbolp = dlsym(myHandle, functionName);
  return((__function_p)(uintptr_t)symbolp);
}
#endif

#ifdef _WIN32
/*
 * jmallett's dl*(3) stubs for DLL management.
 */

char *
dlerror(void)
{
  static char errbuf[IRCD_BUFSIZE];

  FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), errbuf, sizeof(errbuf), NULL);

  return errbuf;
}

void *
dlopen(char *filename, int unused)
{
  return LoadLibrary(filename);
}

int
dlclose(void *module)
{
  return FreeLibrary((HMODULE) module) ? 0 : -1;
}

void *
dlsym(void *module, char *sym)
{
  return GetProcAddress((HMODULE) module, sym);
}
#endif

#ifdef HAVE_MACH_O_DYLD_H
/*
** jmallett's dl*(3) shims for NSModule(3) systems.
*/
#include <mach-o/dyld.h>

#ifndef HAVE_DLOPEN
#ifndef RTLD_LAZY
#define RTLD_LAZY 2185 /* built-in dl*(3) don't care */
#endif

void undefinedErrorHandler(const char *);
NSModule multipleErrorHandler(NSSymbol, NSModule, NSModule);
void linkEditErrorHandler(NSLinkEditErrors, int, const char *, const char *);
char *dlerror(void);
void *dlopen(char *, int);
int dlclose(void *);
void *dlsym(void *, char *);

static int firstLoad = TRUE;
static int myDlError;
static const char *myErrorTable[] =
{
  "Loading file as object failed\n",
  "Loading file as object succeeded\n",
  "Not a valid shared object\n",
  "Architecture of object invalid on this architecture\n",
  "Invalid or corrupt image\n",
  "Could not access object\n",
  "NSCreateObjectFileImageFromFile failed\n",
  NULL
};

void
undefinedErrorHandler(const char *symbolName)
{
  sendto_realops_flags(UMODE_ALL, L_ALL, "Undefined symbol: %s", symbolName);
  ilog(L_WARN, "Undefined symbol: %s", symbolName);
}

NSModule
multipleErrorHandler(NSSymbol s, NSModule old, NSModule new)
{
  /* XXX
  ** This results in substantial leaking of memory... Should free one
  ** module, maybe?
  */
  sendto_realops_flags(UMODE_ALL, L_ALL, "Symbol `%s' found in `%s' and `%s'",
                       NSNameOfSymbol(s), NSNameOfModule(old), NSNameOfModule(new));
  ilog(L_WARN, "Symbol `%s' found in `%s' and `%s'", NSNameOfSymbol(s),
       NSNameOfModule(old), NSNameOfModule(new));
  /* We return which module should be considered valid, I believe */
  return new;
}

void
linkEditErrorHandler(NSLinkEditErrors errorClass, int errnum,
                     const char *fileName, const char *errorString)
{
  sendto_realops_flags(UMODE_ALL, L_ALL, "Link editor error: %s for %s",
                       errorString, fileName);
  ilog(L_WARN, "Link editor error: %s for %s", errorString, fileName);
  return;
}

char *
dlerror(void)
{
  return(myDlError == NSObjectFileImageSuccess ? NULL : myErrorTable[myDlError % 7]);
}

void *
dlopen(char *filename, int unused)
{
  NSObjectFileImage myImage;
  NSModule myModule;

  if (firstLoad)
  {
    /* If we are loading our first symbol (huzzah!) we should go ahead
     * and install link editor error handling!
     */
    NSLinkEditErrorHandlers linkEditorErrorHandlers;

    linkEditorErrorHandlers.undefined = undefinedErrorHandler;
    linkEditorErrorHandlers.multiple  = multipleErrorHandler;
    linkEditorErrorHandlers.linkEdit  = linkEditErrorHandler;
    NSInstallLinkEditErrorHandlers(&linkEditorErrorHandlers);
    firstLoad = FALSE;
  }

  myDlError = NSCreateObjectFileImageFromFile(filename, &myImage);

  if (myDlError != NSObjectFileImageSuccess)
    return(NULL);

  myModule = NSLinkModule(myImage, filename, NSLINKMODULE_OPTION_PRIVATE);
  return((void *)myModule);
}

int
dlclose(void *myModule)
{
  NSUnLinkModule(myModule, FALSE);
  return(0);
}

void *
dlsym(void *myModule, char *mySymbolName)
{
  NSSymbol mySymbol;

  mySymbol = NSLookupSymbolInModule((NSModule)myModule, mySymbolName);
  return NSAddressOfSymbol(mySymbol);
}
#endif
#endif

/* unload_one_module()
 *
 * inputs       - name of module to unload
 *              - 1 to say modules unloaded, 0 to not
 * output       - 0 if successful, -1 if error
 * side effects - module is unloaded
 */
int
unload_one_module(char *name, int warn)
{
  dlink_node *ptr = NULL;
  struct module *modp = NULL;

  if ((ptr = findmodule_byname(name)) == NULL) 
    return -1;

  modp = ptr->data;

  if (modp->modremove)
    (*modp->modremove)();

#ifdef HAVE_SHL_LOAD
    /* shl_* and friends have a slightly different format than dl*. But it does not
     * require creation of a totally new modules.c, instead proper usage of
     * defines solve this case. -TimeMr14C
     */
  shl_unload((shl_t) & (modp->handle));
#else
  /* We use FreeBSD's dlfunc(3) interface, or fake it as we
   * used to here if it isn't there.  The interface should
   * be standardised some day, and so it eventually will be
   * providing something guaranteed to do the right thing here.
   *          -jmallett
   */
  dlclose(modp->handle);
#endif
  assert(dlink_list_length(&mod_list) > 0);
  dlinkDelete(ptr, &mod_list);
  MyFree(modp->name);
  MyFree(modp);

  if (warn == 1)
  {
    ilog(L_INFO, "Module %s unloaded", name);
    sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s unloaded", name);
  }

  return 0;
}

/* load_a_module()
 *
 * inputs       - path name of module, int to notice, int of core
 * output       - -1 if error 0 if success
 * side effects - loads a module if successful
 */
int
load_a_module(char *path, int warn, int core)
{
#ifdef HAVE_DLINFO
  Link_map *map;
#endif
#ifdef HAVE_SHL_LOAD
  shl_t tmpptr;
#else
  void *tmpptr = NULL;
#endif
  void *addr = NULL;
  char *mod_basename;
  void (*initfunc)(void) = NULL;
  void (*mod_deinit)(void) = NULL;
  char **verp;
  char *ver;
  struct module *modp;

  mod_basename = basename(path);

  if (findmodule_byname(mod_basename) != NULL)
    return(1);

#ifdef HAVE_SHL_LOAD
  tmpptr = shl_load(path, BIND_IMMEDIATE, NULL);
#else
  tmpptr = dlopen(path, RTLD_NOW);
#endif

  if (tmpptr == NULL)
  {
#ifdef HAVE_SHL_LOAD
    const char *err = strerror(errno);
#else
    const char *err = dlerror();
#endif
    sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
                         mod_basename, err);
    ilog(L_WARN, "Error loading module %s: %s", mod_basename, err);
    
    return(-1);
  }

#ifdef HAVE_SHL_LOAD
  if (shl_findsym(&tmpptr, "_modinit", TYPE_UNDEFINED, (void *)&initfunc) == -1)
  {
    if (shl_findsym(&tmpptr, "__modinit", TYPE_UNDEFINED, (void *)&initfunc) == -1)
    {
      ilog(L_WARN, "Module %s has no _modinit() function", mod_basename);
      sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _modinit() function",
                           mod_basename);
      shl_unload(tmpptr);
      return(-1);
    }
  }

  if (shl_findsym(&tmpptr, "_moddeinit", TYPE_UNDEFINED, (void *)&mod_deinit) == -1)
  {
    if (shl_findsym(&tmpptr, "__moddeinit", TYPE_UNDEFINED, (void *)&mod_deinit) == -1)
    {
      ilog(L_WARN, "Module %s has no _moddeinit() function", mod_basename);
      sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _moddeinit() function",
                           mod_basename);
      /* this is a soft error.  we're allowed not to have one, i guess.
       * (judging by the code in unload_one_module() */
      mod_deinit = NULL;
    }
  }

  if (shl_findsym(&tmpptr, "_version", TYPE_UNDEFINED, &verp) == -1)
  {
    if (shl_findsym(&tmpptr, "__version", TYPE_UNDEFINED, &verp) == -1)
      ver = unknown_ver;
    else
      ver = *verp;
  }
  else
    ver = *verp;
#else
  if ((initfunc = (void(*)(void))dlfunc(tmpptr, "_modinit")) == NULL &&
      /* Only for compatibility, because some systems have underscore
       * prepended symbol names */
      (initfunc = (void(*)(void))dlfunc(tmpptr, "__modinit")) == NULL)
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _modinit() function",
                         mod_basename);
    ilog(L_WARN, "Module %s has no _modinit() function", mod_basename);
    dlclose(tmpptr);
    return(-1);
  }

  mod_deinit = (void(*)(void))dlfunc(tmpptr, "_moddeinit");

  if (mod_deinit == NULL && (mod_deinit = (void(*)(void))dlfunc(tmpptr, "__moddeinit")) == NULL)
  {
    sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _moddeinit() function",
                         mod_basename);
    ilog(L_WARN, "Module %s has no _moddeinit() function", mod_basename);
    /* blah blah soft error, see above. */
    mod_deinit = NULL;
  }

  verp = (char **)dlsym(tmpptr, "_version");

  if (verp == NULL && (verp = (char **)dlsym(tmpptr, "__version")) == NULL)
    ver = unknown_ver;
  else
    ver = *verp;
#endif

  
  modp            = MyMalloc(sizeof(struct module));
#ifdef HAVE_DLINFO
  dlinfo(tmpptr, RTLD_DI_LINKMAP, &map);
  if (map != NULL)
    addr = map->l_addr;
  else
    addr = tmpptr;
#endif

  modp->handle    = tmpptr;
  modp->address   = addr;
  modp->version   = ver;
  modp->core      = core;
  modp->modremove = mod_deinit;

  DupString(modp->name, mod_basename);
  dlinkAdd(modp, &modp->node, &mod_list);

  initfunc();

  if (warn == 1)
  {
    sendto_realops_flags(UMODE_ALL, L_ALL,
                         "Module %s [version: %s] loaded at %p",
                         mod_basename, ver, addr);
    ilog(L_WARN, "Module %s [version: %s] loaded at %p",
         mod_basename, ver, addr);
  }

  return(0);
}
Revision:	186
Committed:	Sun Oct 23 16:05:01 2005 UTC (20 years, 9 months ago) by db
Content type:	text/x-csrc
File size:	10779 byte(s)
Log Message:	- Q. When is an address not an address? A. When it is a handle! Keep track of handle address and base address of loaded module separately. The address is also used for modlist and could be derived in modlist from handle, but later.
#	Content
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	* dynlink.c: A module loader.
4	*
5	* Copyright (C) 2002 by the past and present ircd coders, and others.
6	*
7	* This program is free software; you can redistribute it and/or modify
8	* it under the terms of the GNU General Public License as published by
9	* the Free Software Foundation; either version 2 of the License, or
10	* (at your option) any later version.
11	*
12	* This program is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15	* GNU General Public License for more details.
16	*
17	* You should have received a copy of the GNU General Public License
18	* along with this program; if not, write to the Free Software
19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20	* USA
21	*
22	* $Id$
23	*
24	*/
25	#include "stdinc.h"
26	#include "modules.h"
27	#include "client.h"
28	#include "send.h"
29
30	#ifndef RTLD_NOW
31	#define RTLD_NOW RTLD_LAZY /* openbsd deficiency */
32	#endif
33
34	extern dlink_list mod_list;
35
36	static char unknown_ver[] = "<unknown>";
37
38	/* This file contains the core functions to use dynamic libraries.
39	* -TimeMr14C
40	*/
41
42	#if !defined(HAVE_SHL_LOAD) && !defined(HAVE_DLFUNC)
43	/*
44	* Fake dlfunc(3) if we don't have it, cause it's happy.
45	*/
46	typedef void (*__function_p)(void);
47
48	static __function_p
49	dlfunc(void myHandle, const char functionName)
50	{
51	/* XXX This is not guaranteed to work, but with
52	* traditional dl*(3), it is the best we can do.
53	* -jmallett
54	*/
55	void *symbolp;
56
57	symbolp = dlsym(myHandle, functionName);
58	return((__function_p)(uintptr_t)symbolp);
59	}
60	#endif
61
62	#ifdef _WIN32
63	/*
64	* jmallett's dl*(3) stubs for DLL management.
65	*/
66
67	char *
68	dlerror(void)
69	{
70	static char errbuf[IRCD_BUFSIZE];
71
72	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(),
73	MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), errbuf, sizeof(errbuf), NULL);
74
75	return errbuf;
76	}
77
78	void *
79	dlopen(char *filename, int unused)
80	{
81	return LoadLibrary(filename);
82	}
83
84	int
85	dlclose(void *module)
86	{
87	return FreeLibrary((HMODULE) module) ? 0 : -1;
88	}
89
90	void *
91	dlsym(void module, char sym)
92	{
93	return GetProcAddress((HMODULE) module, sym);
94	}
95	#endif
96
97	#ifdef HAVE_MACH_O_DYLD_H
98	/*
99	** jmallett's dl*(3) shims for NSModule(3) systems.
100	*/
101	#include <mach-o/dyld.h>
102
103	#ifndef HAVE_DLOPEN
104	#ifndef RTLD_LAZY
105	#define RTLD_LAZY 2185 /* built-in dl(3) don't care /
106	#endif
107
108	void undefinedErrorHandler(const char *);
109	NSModule multipleErrorHandler(NSSymbol, NSModule, NSModule);
110	void linkEditErrorHandler(NSLinkEditErrors, int, const char , const char );
111	char *dlerror(void);
112	void dlopen(char , int);
113	int dlclose(void *);
114	void dlsym(void , char *);
115
116	static int firstLoad = TRUE;
117	static int myDlError;
118	static const char *myErrorTable[] =
119	{
120	"Loading file as object failed\n",
121	"Loading file as object succeeded\n",
122	"Not a valid shared object\n",
123	"Architecture of object invalid on this architecture\n",
124	"Invalid or corrupt image\n",
125	"Could not access object\n",
126	"NSCreateObjectFileImageFromFile failed\n",
127	NULL
128	};
129
130	void
131	undefinedErrorHandler(const char *symbolName)
132	{
133	sendto_realops_flags(UMODE_ALL, L_ALL, "Undefined symbol: %s", symbolName);
134	ilog(L_WARN, "Undefined symbol: %s", symbolName);
135	}
136
137	NSModule
138	multipleErrorHandler(NSSymbol s, NSModule old, NSModule new)
139	{
140	/* XXX
141	** This results in substantial leaking of memory... Should free one
142	** module, maybe?
143	*/
144	sendto_realops_flags(UMODE_ALL, L_ALL, "Symbol `%s' found in `%s' and `%s'",
145	NSNameOfSymbol(s), NSNameOfModule(old), NSNameOfModule(new));
146	ilog(L_WARN, "Symbol `%s' found in `%s' and `%s'", NSNameOfSymbol(s),
147	NSNameOfModule(old), NSNameOfModule(new));
148	/* We return which module should be considered valid, I believe */
149	return new;
150	}
151
152	void
153	linkEditErrorHandler(NSLinkEditErrors errorClass, int errnum,
154	const char fileName, const char errorString)
155	{
156	sendto_realops_flags(UMODE_ALL, L_ALL, "Link editor error: %s for %s",
157	errorString, fileName);
158	ilog(L_WARN, "Link editor error: %s for %s", errorString, fileName);
159	return;
160	}
161
162	char *
163	dlerror(void)
164	{
165	return(myDlError == NSObjectFileImageSuccess ? NULL : myErrorTable[myDlError % 7]);
166	}
167
168	void *
169	dlopen(char *filename, int unused)
170	{
171	NSObjectFileImage myImage;
172	NSModule myModule;
173
174	if (firstLoad)
175	{
176	/* If we are loading our first symbol (huzzah!) we should go ahead
177	* and install link editor error handling!
178	*/
179	NSLinkEditErrorHandlers linkEditorErrorHandlers;
180
181	linkEditorErrorHandlers.undefined = undefinedErrorHandler;
182	linkEditorErrorHandlers.multiple = multipleErrorHandler;
183	linkEditorErrorHandlers.linkEdit = linkEditErrorHandler;
184	NSInstallLinkEditErrorHandlers(&linkEditorErrorHandlers);
185	firstLoad = FALSE;
186	}
187
188	myDlError = NSCreateObjectFileImageFromFile(filename, &myImage);
189
190	if (myDlError != NSObjectFileImageSuccess)
191	return(NULL);
192
193	myModule = NSLinkModule(myImage, filename, NSLINKMODULE_OPTION_PRIVATE);
194	return((void *)myModule);
195	}
196
197	int
198	dlclose(void *myModule)
199	{
200	NSUnLinkModule(myModule, FALSE);
201	return(0);
202	}
203
204	void *
205	dlsym(void myModule, char mySymbolName)
206	{
207	NSSymbol mySymbol;
208
209	mySymbol = NSLookupSymbolInModule((NSModule)myModule, mySymbolName);
210	return NSAddressOfSymbol(mySymbol);
211	}
212	#endif
213	#endif
214
215	/* unload_one_module()
216	*
217	* inputs - name of module to unload
218	* - 1 to say modules unloaded, 0 to not
219	* output - 0 if successful, -1 if error
220	* side effects - module is unloaded
221	*/
222	int
223	unload_one_module(char *name, int warn)
224	{
225	dlink_node *ptr = NULL;
226	struct module *modp = NULL;
227
228	if ((ptr = findmodule_byname(name)) == NULL)
229	return -1;
230
231	modp = ptr->data;
232
233	if (modp->modremove)
234	(*modp->modremove)();
235
236	#ifdef HAVE_SHL_LOAD
237	/* shl_* and friends have a slightly different format than dl*. But it does not
238	* require creation of a totally new modules.c, instead proper usage of
239	* defines solve this case. -TimeMr14C
240	*/
241	shl_unload((shl_t) & (modp->handle));
242	#else
243	/* We use FreeBSD's dlfunc(3) interface, or fake it as we
244	* used to here if it isn't there. The interface should
245	* be standardised some day, and so it eventually will be
246	* providing something guaranteed to do the right thing here.
247	* -jmallett
248	*/
249	dlclose(modp->handle);
250	#endif
251	assert(dlink_list_length(&mod_list) > 0);
252	dlinkDelete(ptr, &mod_list);
253	MyFree(modp->name);
254	MyFree(modp);
255
256	if (warn == 1)
257	{
258	ilog(L_INFO, "Module %s unloaded", name);
259	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s unloaded", name);
260	}
261
262	return 0;
263	}
264
265	/* load_a_module()
266	*
267	* inputs - path name of module, int to notice, int of core
268	* output - -1 if error 0 if success
269	* side effects - loads a module if successful
270	*/
271	int
272	load_a_module(char *path, int warn, int core)
273	{
274	#ifdef HAVE_DLINFO
275	Link_map *map;
276	#endif
277	#ifdef HAVE_SHL_LOAD
278	shl_t tmpptr;
279	#else
280	void *tmpptr = NULL;
281	#endif
282	void *addr = NULL;
283	char *mod_basename;
284	void (*initfunc)(void) = NULL;
285	void (*mod_deinit)(void) = NULL;
286	char **verp;
287	char *ver;
288	struct module *modp;
289
290	mod_basename = basename(path);
291
292	if (findmodule_byname(mod_basename) != NULL)
293	return(1);
294
295	#ifdef HAVE_SHL_LOAD
296	tmpptr = shl_load(path, BIND_IMMEDIATE, NULL);
297	#else
298	tmpptr = dlopen(path, RTLD_NOW);
299	#endif
300
301	if (tmpptr == NULL)
302	{
303	#ifdef HAVE_SHL_LOAD
304	const char *err = strerror(errno);
305	#else
306	const char *err = dlerror();
307	#endif
308	sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
309	mod_basename, err);
310	ilog(L_WARN, "Error loading module %s: %s", mod_basename, err);
311
312	return(-1);
313	}
314
315	#ifdef HAVE_SHL_LOAD
316	if (shl_findsym(&tmpptr, "_modinit", TYPE_UNDEFINED, (void *)&initfunc) == -1)
317	{
318	if (shl_findsym(&tmpptr, "__modinit", TYPE_UNDEFINED, (void *)&initfunc) == -1)
319	{
320	ilog(L_WARN, "Module %s has no _modinit() function", mod_basename);
321	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _modinit() function",
322	mod_basename);
323	shl_unload(tmpptr);
324	return(-1);
325	}
326	}
327
328	if (shl_findsym(&tmpptr, "_moddeinit", TYPE_UNDEFINED, (void *)&mod_deinit) == -1)
329	{
330	if (shl_findsym(&tmpptr, "__moddeinit", TYPE_UNDEFINED, (void *)&mod_deinit) == -1)
331	{
332	ilog(L_WARN, "Module %s has no _moddeinit() function", mod_basename);
333	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _moddeinit() function",
334	mod_basename);
335	/* this is a soft error. we're allowed not to have one, i guess.
336	* (judging by the code in unload_one_module() */
337	mod_deinit = NULL;
338	}
339	}
340
341	if (shl_findsym(&tmpptr, "_version", TYPE_UNDEFINED, &verp) == -1)
342	{
343	if (shl_findsym(&tmpptr, "__version", TYPE_UNDEFINED, &verp) == -1)
344	ver = unknown_ver;
345	else
346	ver = *verp;
347	}
348	else
349	ver = *verp;
350	#else
351	if ((initfunc = (void(*)(void))dlfunc(tmpptr, "_modinit")) == NULL &&
352	/* Only for compatibility, because some systems have underscore
353	* prepended symbol names */
354	(initfunc = (void(*)(void))dlfunc(tmpptr, "__modinit")) == NULL)
355	{
356	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _modinit() function",
357	mod_basename);
358	ilog(L_WARN, "Module %s has no _modinit() function", mod_basename);
359	dlclose(tmpptr);
360	return(-1);
361	}
362
363	mod_deinit = (void(*)(void))dlfunc(tmpptr, "_moddeinit");
364
365	if (mod_deinit == NULL && (mod_deinit = (void(*)(void))dlfunc(tmpptr, "__moddeinit")) == NULL)
366	{
367	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s has no _moddeinit() function",
368	mod_basename);
369	ilog(L_WARN, "Module %s has no _moddeinit() function", mod_basename);
370	/* blah blah soft error, see above. */
371	mod_deinit = NULL;
372	}
373
374	verp = (char **)dlsym(tmpptr, "_version");
375
376	if (verp == NULL && (verp = (char **)dlsym(tmpptr, "__version")) == NULL)
377	ver = unknown_ver;
378	else
379	ver = *verp;
380	#endif
381
382
383	modp = MyMalloc(sizeof(struct module));
384	#ifdef HAVE_DLINFO
385	dlinfo(tmpptr, RTLD_DI_LINKMAP, &map);
386	if (map != NULL)
387	addr = map->l_addr;
388	else
389	addr = tmpptr;
390	#endif
391
392	modp->handle = tmpptr;
393	modp->address = addr;
394	modp->version = ver;
395	modp->core = core;
396	modp->modremove = mod_deinit;
397
398	DupString(modp->name, mod_basename);
399	dlinkAdd(modp, &modp->node, &mod_list);
400
401	initfunc();
402
403	if (warn == 1)
404	{
405	sendto_realops_flags(UMODE_ALL, L_ALL,
406	"Module %s [version: %s] loaded at %p",
407	mod_basename, ver, addr);
408	ilog(L_WARN, "Module %s [version: %s] loaded at %p",
409	mod_basename, ver, addr);
410	}
411
412	return(0);
413	}