trunk/src/modules.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *  modules.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 "ltdl.h"

#include "stdinc.h"
#include "list.h"
#include "modules.h"
#include "log.h"
#include "ircd.h"
#include "client.h"
#include "send.h"
#include "conf.h"
#include "numeric.h"
#include "parse.h"
#include "ircd_defs.h"
#include "irc_string.h"
#include "memory.h"


dlink_list modules_list = { NULL, NULL, 0 };

static const char *unknown_ver = "<unknown>";

static const char *core_module_table[] =
{
  "m_die.la",
  "m_error.la",
  "m_join.la",
  "m_kick.la",
  "m_kill.la",
  "m_message.la",
  "m_mode.la",
  "m_nick.la",
  "m_part.la",
  "m_quit.la",
  "m_server.la",
  "m_sjoin.la",
  "m_squit.la",
  NULL
};

static dlink_list mod_paths = { NULL, NULL, 0 };
static dlink_list conf_modules = { NULL, NULL, 0 };

int
modules_valid_suffix(const char *name)
{
  return ((name = strrchr(name, '.'))) && !strcmp(name, ".la");
}

/* 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(const char *name, int warn)
{
  struct module *modp = NULL;

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

  if (modp->modexit)
   modp->modexit();

  assert(dlink_list_length(&modules_list) > 0);
  dlinkDelete(&modp->node, &modules_list);
  MyFree(modp->name);

  lt_dlclose(modp->handle);

  if (warn == 1)
  {
    ilog(LOG_TYPE_IRCD, "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(const char *path, int warn)
{
  lt_dlhandle tmpptr = NULL;
  const char *mod_basename = NULL;
  struct module *modp = NULL;

  if (findmodule_byname((mod_basename = libio_basename(path))))
    return 1;

  if (!(tmpptr = lt_dlopen(path))) {
    const char *err = ((err = lt_dlerror())) ? err : "<unknown>";

    sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
                         mod_basename, err);
    ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
    return -1;
  }

  if ((modp = lt_dlsym(tmpptr, "module_entry")) == NULL)
  {
    const char *err = ((err = lt_dlerror())) ? err : "<unknown>";

    sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
                         mod_basename, err);
    ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
    lt_dlclose(tmpptr);
    return -1;
  }

  modp->handle = tmpptr;

  if (EmptyString(modp->version))
    modp->version = unknown_ver;

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

  if (modp->modinit)
    modp->modinit();

  if (warn == 1)
  {
    sendto_realops_flags(UMODE_ALL, L_ALL,
                         "Module %s [version: %s handle: %p] loaded.",
                         modp->name, modp->version, tmpptr);
    ilog(LOG_TYPE_IRCD, "Module %s [version: %s handle: %p] loaded.",
         modp->name, modp->version, tmpptr);
  }

  return 0;
}

/*
 * modules_init
 *
 * input        - NONE
 * output       - NONE
 * side effects - The basic module manipulation modules are loaded
 */
void
modules_init(void)
{
  if (lt_dlinit())
  {
    ilog(LOG_TYPE_IRCD, "Couldn't initialize the libltdl run time dynamic"
         " link library. Exiting.");
    exit(0);
  }
}

/* mod_find_path()
 *
 * input        - path
 * output       - none
 * side effects - returns a module path from path
 */
static struct module_path *
mod_find_path(const char *path)
{
  dlink_node *ptr;

  DLINK_FOREACH(ptr, mod_paths.head)
  {
    struct module_path *mpath = ptr->data;

    if (!strcmp(path, mpath->path))
      return mpath;
  }

  return NULL;
}

/* mod_add_path()
 *
 * input        - path
 * output       - NONE
 * side effects - adds path to list
 */
void
mod_add_path(const char *path)
{
  struct module_path *pathst;

  if (mod_find_path(path))
    return;

  pathst = MyMalloc(sizeof(struct module_path));

  strlcpy(pathst->path, path, sizeof(pathst->path));
  dlinkAdd(pathst, &pathst->node, &mod_paths);
}

/* add_conf_module
 *
 * input        - module name
 * output       - NONE
 * side effects - adds module to conf_mod
 */
void
add_conf_module(const char *name)
{
  struct module_path *pathst;

  pathst = MyMalloc(sizeof(struct module_path));

  strlcpy(pathst->path, name, sizeof(pathst->path));
  dlinkAdd(pathst, &pathst->node, &conf_modules);
}

/* mod_clear_paths()
 *
 * input        - NONE
 * output       - NONE
 * side effects - clear the lists of paths and conf modules
 */
void
mod_clear_paths(void)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;

  DLINK_FOREACH_SAFE(ptr, next_ptr, mod_paths.head)
  {
    dlinkDelete(ptr, &mod_paths);
    MyFree(ptr->data);
  }

  DLINK_FOREACH_SAFE(ptr, next_ptr, conf_modules.head)
  {
    dlinkDelete(ptr, &conf_modules);
    MyFree(ptr->data);
  }
}

/* findmodule_byname
 *
 * input        - name of module
 * output       - NULL if not found or pointer to module
 * side effects - NONE
 */
struct module *
findmodule_byname(const char *name)
{
  dlink_node *ptr = NULL;

  DLINK_FOREACH(ptr, modules_list.head)
  {
    struct module *modp = ptr->data;

    if (strcmp(modp->name, name) == 0)
      return modp;
  }

  return NULL;
}

/* load_all_modules()
 *
 * input        - int flag warn
 * output       - NONE
 * side effects - load all modules found in autoload directory
 */
void
load_all_modules(int warn)
{
  DIR *system_module_dir = NULL;
  struct dirent *ldirent = NULL;
  char module_fq_name[PATH_MAX + 1];

  if ((system_module_dir = opendir(AUTOMODPATH)) == NULL)
  {
    ilog(LOG_TYPE_IRCD, "Could not load modules from %s: %s",
         AUTOMODPATH, strerror(errno));
    return;
  }

  while ((ldirent = readdir(system_module_dir)) != NULL)
  {
    if (modules_valid_suffix(ldirent->d_name))
    {
       snprintf(module_fq_name, sizeof(module_fq_name), "%s/%s",
                AUTOMODPATH, ldirent->d_name);
       load_a_module(module_fq_name, warn);
    }
  }

  closedir(system_module_dir);
}

/* load_conf_modules()
 *
 * input        - NONE
 * output       - NONE
 * side effects - load modules given in ircd.conf
 */
void
load_conf_modules(void)
{
  dlink_node *ptr = NULL;

  DLINK_FOREACH(ptr, conf_modules.head)
  {
    struct module_path *mpath = ptr->data;

    if (findmodule_byname(mpath->path) == NULL)
      load_one_module(mpath->path);
  }
}

/* load_core_modules()
 *
 * input        - int flag warn
 * output       - NONE
 * side effects - core modules are loaded, if any fail, kill ircd
 */
void
load_core_modules(int warn)
{
  char module_name[PATH_MAX + 1];
  int i = 0;

  for (; core_module_table[i]; ++i)
  {
    snprintf(module_name, sizeof(module_name), "%s%s",
             MODPATH, core_module_table[i]);

    if (load_a_module(module_name, warn) == -1)
    {
      ilog(LOG_TYPE_IRCD, "Error loading core module %s: terminating ircd",
           core_module_table[i]);
      exit(EXIT_FAILURE);
    }
  }
}

/* load_one_module()
 *
 * input        - pointer to path
 *              - flagged as core module or not
 * output       - -1 if error 
 * side effects - module is loaded if found.
 */
int
load_one_module(const char *path)
{
  dlink_node *ptr = NULL;
  char modpath[PATH_MAX + 1];
  struct stat statbuf;

  DLINK_FOREACH(ptr, mod_paths.head)
  {
    const struct module_path *mpath = ptr->data;

    snprintf(modpath, sizeof(modpath), "%s/%s", mpath->path, path);

    if (!modules_valid_suffix(path))
      continue;

    if (strstr(modpath, "../") == NULL &&
        strstr(modpath, "/..") == NULL) 
      if (!stat(modpath, &statbuf))
        if (S_ISREG(statbuf.st_mode))  /* Regular files only please */
          return load_a_module(modpath, 1);
  }

  sendto_realops_flags(UMODE_ALL, L_ALL,
                       "Cannot locate module %s", path);
  ilog(LOG_TYPE_IRCD, "Cannot locate module %s", path);
  return -1;
}
Revision:	1592
Committed:	Sat Oct 27 21:02:32 2012 UTC (12 years, 10 months ago) by michael
Content type:	text/x-csrc
File size:	8928 byte(s)
Log Message:	- Second time's the charm? Moving svnroot/ircd-hybrid-8 to svnroot/ircd-hybrid/trunk
#	User	Rev	Content
1	adx	30	/*
2			* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3			* modules.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	knight	31	* $Id$
23	adx	30	*/
24
25	michael	1237	#include "ltdl.h"
26
27	adx	30	#include "stdinc.h"
28	michael	1011	#include "list.h"
29	adx	30	#include "modules.h"
30	michael	1309	#include "log.h"
31	adx	30	#include "ircd.h"
32			#include "client.h"
33			#include "send.h"
34	michael	1309	#include "conf.h"
35	adx	30	#include "numeric.h"
36			#include "parse.h"
37			#include "ircd_defs.h"
38			#include "irc_string.h"
39			#include "memory.h"
40
41
42	michael	1447	dlink_list modules_list = { NULL, NULL, 0 };
43	adx	30
44	michael	1237	static const char *unknown_ver = "<unknown>";
45
46	adx	30	static const char *core_module_table[] =
47			{
48	michael	912	"m_die.la",
49	michael	946	"m_error.la",
50	michael	912	"m_join.la",
51			"m_kick.la",
52			"m_kill.la",
53			"m_message.la",
54			"m_mode.la",
55			"m_nick.la",
56			"m_part.la",
57			"m_quit.la",
58			"m_server.la",
59			"m_sjoin.la",
60			"m_squit.la",
61	adx	30	NULL
62			};
63
64			static dlink_list mod_paths = { NULL, NULL, 0 };
65			static dlink_list conf_modules = { NULL, NULL, 0 };
66
67	michael	1237	int
68			modules_valid_suffix(const char *name)
69			{
70			return ((name = strrchr(name, '.'))) && !strcmp(name, ".la");
71			}
72
73			/* unload_one_module()
74			*
75			* inputs - name of module to unload
76			* - 1 to say modules unloaded, 0 to not
77			* output - 0 if successful, -1 if error
78			* side effects - module is unloaded
79			*/
80			int
81			unload_one_module(const char *name, int warn)
82			{
83			struct module *modp = NULL;
84
85			if ((modp = findmodule_byname(name)) == NULL)
86			return -1;
87
88			if (modp->modexit)
89			modp->modexit();
90
91	michael	1238	assert(dlink_list_length(&modules_list) > 0);
92			dlinkDelete(&modp->node, &modules_list);
93	michael	1237	MyFree(modp->name);
94
95			lt_dlclose(modp->handle);
96
97			if (warn == 1)
98			{
99	michael	1247	ilog(LOG_TYPE_IRCD, "Module %s unloaded", name);
100	michael	1237	sendto_realops_flags(UMODE_ALL, L_ALL, "Module %s unloaded", name);
101			}
102
103			return 0;
104			}
105
106			/* load_a_module()
107			*
108			* inputs - path name of module, int to notice, int of core
109			* output - -1 if error 0 if success
110			* side effects - loads a module if successful
111			*/
112			int
113	michael	1404	load_a_module(const char *path, int warn)
114	michael	1237	{
115			lt_dlhandle tmpptr = NULL;
116			const char *mod_basename = NULL;
117			struct module *modp = NULL;
118
119			if (findmodule_byname((mod_basename = libio_basename(path))))
120			return 1;
121
122			if (!(tmpptr = lt_dlopen(path))) {
123			const char *err = ((err = lt_dlerror())) ? err : "<unknown>";
124
125			sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
126			mod_basename, err);
127	michael	1247	ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
128	michael	1237	return -1;
129			}
130
131			if ((modp = lt_dlsym(tmpptr, "module_entry")) == NULL)
132			{
133	michael	1574	const char *err = ((err = lt_dlerror())) ? err : "<unknown>";
134
135			sendto_realops_flags(UMODE_ALL, L_ALL, "Error loading module %s: %s",
136			mod_basename, err);
137			ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
138	michael	1237	lt_dlclose(tmpptr);
139			return -1;
140			}
141
142			modp->handle = tmpptr;
143
144			if (EmptyString(modp->version))
145			modp->version = unknown_ver;
146
147			DupString(modp->name, mod_basename);
148	michael	1238	dlinkAdd(modp, &modp->node, &modules_list);
149	michael	1237
150			if (modp->modinit)
151			modp->modinit();
152
153			if (warn == 1)
154			{
155			sendto_realops_flags(UMODE_ALL, L_ALL,
156			"Module %s [version: %s handle: %p] loaded.",
157			modp->name, modp->version, tmpptr);
158	michael	1247	ilog(LOG_TYPE_IRCD, "Module %s [version: %s handle: %p] loaded.",
159	michael	1237	modp->name, modp->version, tmpptr);
160			}
161
162			return 0;
163			}
164
165	adx	30	/*
166			* modules_init
167			*
168			* input - NONE
169			* output - NONE
170			* side effects - The basic module manipulation modules are loaded
171			*/
172			void
173			modules_init(void)
174			{
175	michael	1237	if (lt_dlinit())
176			{
177	michael	1247	ilog(LOG_TYPE_IRCD, "Couldn't initialize the libltdl run time dynamic"
178	michael	1237	" link library. Exiting.");
179			exit(0);
180			}
181	adx	30	}
182
183			/* mod_find_path()
184			*
185			* input - path
186			* output - none
187			* side effects - returns a module path from path
188			*/
189			static struct module_path *
190			mod_find_path(const char *path)
191			{
192			dlink_node *ptr;
193
194			DLINK_FOREACH(ptr, mod_paths.head)
195			{
196	michael	1404	struct module_path *mpath = ptr->data;
197	adx	30
198			if (!strcmp(path, mpath->path))
199			return mpath;
200			}
201
202			return NULL;
203			}
204
205			/* mod_add_path()
206			*
207			* input - path
208			* output - NONE
209			* side effects - adds path to list
210			*/
211			void
212			mod_add_path(const char *path)
213			{
214			struct module_path *pathst;
215
216			if (mod_find_path(path))
217			return;
218
219			pathst = MyMalloc(sizeof(struct module_path));
220
221			strlcpy(pathst->path, path, sizeof(pathst->path));
222			dlinkAdd(pathst, &pathst->node, &mod_paths);
223			}
224
225			/* add_conf_module
226			*
227			* input - module name
228			* output - NONE
229			* side effects - adds module to conf_mod
230			*/
231			void
232			add_conf_module(const char *name)
233			{
234			struct module_path *pathst;
235
236			pathst = MyMalloc(sizeof(struct module_path));
237
238			strlcpy(pathst->path, name, sizeof(pathst->path));
239			dlinkAdd(pathst, &pathst->node, &conf_modules);
240			}
241
242			/* mod_clear_paths()
243			*
244			* input - NONE
245			* output - NONE
246			* side effects - clear the lists of paths and conf modules
247			*/
248			void
249			mod_clear_paths(void)
250			{
251	michael	1237	dlink_node ptr = NULL, next_ptr = NULL;
252	adx	30
253			DLINK_FOREACH_SAFE(ptr, next_ptr, mod_paths.head)
254			{
255	michael	1404	dlinkDelete(ptr, &mod_paths);
256			MyFree(ptr->data);
257	adx	30	}
258
259			DLINK_FOREACH_SAFE(ptr, next_ptr, conf_modules.head)
260			{
261	michael	1404	dlinkDelete(ptr, &conf_modules);
262			MyFree(ptr->data);
263	adx	30	}
264			}
265
266			/* findmodule_byname
267			*
268			* input - name of module
269			* output - NULL if not found or pointer to module
270			* side effects - NONE
271			*/
272	michael	1230	struct module *
273	adx	30	findmodule_byname(const char *name)
274			{
275	michael	1230	dlink_node *ptr = NULL;
276	adx	30
277	michael	1238	DLINK_FOREACH(ptr, modules_list.head)
278	adx	30	{
279	michael	1230	struct module *modp = ptr->data;
280	adx	30
281	db	218	if (strcmp(modp->name, name) == 0)
282	michael	1230	return modp;
283	adx	30	}
284
285			return NULL;
286			}
287
288			/* load_all_modules()
289			*
290			* input - int flag warn
291			* output - NONE
292			* side effects - load all modules found in autoload directory
293			*/
294			void
295			load_all_modules(int warn)
296			{
297			DIR *system_module_dir = NULL;
298			struct dirent *ldirent = NULL;
299			char module_fq_name[PATH_MAX + 1];
300
301			if ((system_module_dir = opendir(AUTOMODPATH)) == NULL)
302			{
303	michael	1247	ilog(LOG_TYPE_IRCD, "Could not load modules from %s: %s",
304	adx	30	AUTOMODPATH, strerror(errno));
305			return;
306			}
307
308			while ((ldirent = readdir(system_module_dir)) != NULL)
309			{
310	michael	912	if (modules_valid_suffix(ldirent->d_name))
311	adx	30	{
312			snprintf(module_fq_name, sizeof(module_fq_name), "%s/%s",
313			AUTOMODPATH, ldirent->d_name);
314	michael	1404	load_a_module(module_fq_name, warn);
315	adx	30	}
316			}
317
318			closedir(system_module_dir);
319			}
320
321			/* load_conf_modules()
322			*
323			* input - NONE
324			* output - NONE
325			* side effects - load modules given in ircd.conf
326			*/
327			void
328			load_conf_modules(void)
329			{
330			dlink_node *ptr = NULL;
331
332			DLINK_FOREACH(ptr, conf_modules.head)
333			{
334	michael	1404	struct module_path *mpath = ptr->data;
335	adx	30
336			if (findmodule_byname(mpath->path) == NULL)
337	michael	1404	load_one_module(mpath->path);
338	adx	30	}
339			}
340
341			/* load_core_modules()
342			*
343			* input - int flag warn
344			* output - NONE
345			* side effects - core modules are loaded, if any fail, kill ircd
346			*/
347			void
348			load_core_modules(int warn)
349			{
350			char module_name[PATH_MAX + 1];
351			int i = 0;
352
353			for (; core_module_table[i]; ++i)
354			{
355	michael	912	snprintf(module_name, sizeof(module_name), "%s%s",
356			MODPATH, core_module_table[i]);
357	adx	30
358	michael	1404	if (load_a_module(module_name, warn) == -1)
359	adx	30	{
360	michael	1247	ilog(LOG_TYPE_IRCD, "Error loading core module %s: terminating ircd",
361	michael	912	core_module_table[i]);
362	adx	30	exit(EXIT_FAILURE);
363			}
364			}
365			}
366
367			/* load_one_module()
368			*
369			* input - pointer to path
370			* - flagged as core module or not
371			* output - -1 if error
372			* side effects - module is loaded if found.
373			*/
374			int
375	michael	1404	load_one_module(const char *path)
376	adx	30	{
377			dlink_node *ptr = NULL;
378			char modpath[PATH_MAX + 1];
379			struct stat statbuf;
380
381			DLINK_FOREACH(ptr, mod_paths.head)
382			{
383			const struct module_path *mpath = ptr->data;
384
385			snprintf(modpath, sizeof(modpath), "%s/%s", mpath->path, path);
386
387	michael	912	if (!modules_valid_suffix(path))
388			continue;
389
390	adx	30	if (strstr(modpath, "../") == NULL &&
391			strstr(modpath, "/..") == NULL)
392			if (!stat(modpath, &statbuf))
393	michael	1404	if (S_ISREG(statbuf.st_mode)) /* Regular files only please */
394			return load_a_module(modpath, 1);
395	adx	30	}
396
397			sendto_realops_flags(UMODE_ALL, L_ALL,
398			"Cannot locate module %s", path);
399	michael	1247	ilog(LOG_TYPE_IRCD, "Cannot locate module %s", path);
400	adx	30	return -1;
401			}