trunk/src/modules.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 2000-2016 ircd-hybrid development team
 *
 *  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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file modules.c
 * \brief A module loader.
 * \version $Id$
 */

#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"


static dlink_list modules_list;
static dlink_list modules_path;
static dlink_list modules_conf;

static const char *const unknown_ver = "<unknown>";
static const char *const core_module_table[] =
{
  "m_bmask.la",
  "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",
  "m_tmode.la",
  NULL
};


dlink_list *
modules_get_list(void)
{
  return &modules_list;
}

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);
  xfree(modp->name);

  lt_dlclose(modp->handle);

  if (warn == 1)
  {
    ilog(LOG_TYPE_IRCD, "Module %s unloaded", name);
    sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "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_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "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_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "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;

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

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

  if (warn == 1)
  {
    sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
                         "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(EXIT_FAILURE);
  }
}

/* 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 *node = NULL;

  DLINK_FOREACH(node, modules_path.head)
  {
    struct module_path *mpath = node->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 = xcalloc(sizeof(struct module_path));
  pathst->path = xstrdup(path);
  dlinkAdd(pathst, &pathst->node, &modules_path);
}

/* 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 = xcalloc(sizeof(struct module_path));
  pathst->path = xstrdup(name);
  dlinkAdd(pathst, &pathst->node, &modules_conf);
}

/* mod_clear_paths()
 *
 * input        - NONE
 * output       - NONE
 * side effects - clear the lists of paths and conf modules
 */
void
modules_conf_clear(void)
{
  while (modules_path.head)
  {
    struct module_path *path = modules_path.head->data;

    dlinkDelete(&path->node, &modules_path);
    xfree(path->path);
    xfree(path);
  }

  while (modules_conf.head)
  {
    struct module_path *path = modules_conf.head->data;

    dlinkDelete(&path->node, &modules_conf);
    xfree(path->path);
    xfree(path);
  }
}

/* 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 *node = NULL;

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

    if (!strcmp(modp->name, name))
      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[HYB_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)))
  {
    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 *node = NULL;

  DLINK_FOREACH(node, modules_conf.head)
  {
    struct module_path *mpath = node->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[HYB_PATH_MAX + 1];

  for (unsigned int i = 0; 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 *name)
{
  dlink_node *node = NULL;
  char path[HYB_PATH_MAX + 1];
  struct stat statbuf;

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

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

    if (!modules_valid_suffix(name))
      continue;

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

  sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
                       "Cannot locate module %s", name);
  ilog(LOG_TYPE_IRCD, "Cannot locate module %s", name);
  return -1;
}
Revision:	7499
Committed:	Tue Mar 22 19:47:12 2016 UTC (9 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	9237 byte(s)
Log Message:	- modules.h, modules.c: avoid using HYB_PATH_MAX for module_path::path
#	Content
1	/*
2	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	*
4	* Copyright (c) 2000-2016 ircd-hybrid development team
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
19	* USA
20	*/
21
22	/*! \file modules.c
23	* \brief A module loader.
24	* \version $Id$
25	*/
26
27	#include "ltdl.h"
28
29	#include "stdinc.h"
30	#include "list.h"
31	#include "modules.h"
32	#include "log.h"
33	#include "ircd.h"
34	#include "client.h"
35	#include "send.h"
36	#include "conf.h"
37	#include "numeric.h"
38	#include "parse.h"
39	#include "ircd_defs.h"
40	#include "irc_string.h"
41	#include "memory.h"
42
43
44	static dlink_list modules_list;
45	static dlink_list modules_path;
46	static dlink_list modules_conf;
47
48	static const char *const unknown_ver = "<unknown>";
49	static const char *const core_module_table[] =
50	{
51	"m_bmask.la",
52	"m_die.la",
53	"m_error.la",
54	"m_join.la",
55	"m_kick.la",
56	"m_kill.la",
57	"m_message.la",
58	"m_mode.la",
59	"m_nick.la",
60	"m_part.la",
61	"m_quit.la",
62	"m_server.la",
63	"m_sjoin.la",
64	"m_squit.la",
65	"m_tmode.la",
66	NULL
67	};
68
69
70	dlink_list *
71	modules_get_list(void)
72	{
73	return &modules_list;
74	}
75
76	int
77	modules_valid_suffix(const char *name)
78	{
79	return ((name = strrchr(name, '.'))) && !strcmp(name, ".la");
80	}
81
82	/* unload_one_module()
83	*
84	* inputs - name of module to unload
85	* - 1 to say modules unloaded, 0 to not
86	* output - 0 if successful, -1 if error
87	* side effects - module is unloaded
88	*/
89	int
90	unload_one_module(const char *name, int warn)
91	{
92	struct module *modp = NULL;
93
94	if ((modp = findmodule_byname(name)) == NULL)
95	return -1;
96
97	if (modp->modexit)
98	modp->modexit();
99
100	assert(dlink_list_length(&modules_list) > 0);
101	dlinkDelete(&modp->node, &modules_list);
102	xfree(modp->name);
103
104	lt_dlclose(modp->handle);
105
106	if (warn == 1)
107	{
108	ilog(LOG_TYPE_IRCD, "Module %s unloaded", name);
109	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
110	"Module %s unloaded", name);
111	}
112
113	return 0;
114	}
115
116	/* load_a_module()
117	*
118	* inputs - path name of module, int to notice, int of core
119	* output - -1 if error 0 if success
120	* side effects - loads a module if successful
121	*/
122	int
123	load_a_module(const char *path, int warn)
124	{
125	lt_dlhandle tmpptr = NULL;
126	const char *mod_basename = NULL;
127	struct module *modp = NULL;
128
129	if (findmodule_byname((mod_basename = libio_basename(path))))
130	return 1;
131
132	if (!(tmpptr = lt_dlopen(path)))
133	{
134	const char *err = ((err = lt_dlerror())) ? err : "<unknown>";
135
136	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
137	"Error loading module %s: %s",
138	mod_basename, err);
139	ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
140	return -1;
141	}
142
143	if ((modp = lt_dlsym(tmpptr, "module_entry")) == NULL)
144	{
145	const char *err = ((err = lt_dlerror())) ? err : "<unknown>";
146
147	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
148	"Error loading module %s: %s",
149	mod_basename, err);
150	ilog(LOG_TYPE_IRCD, "Error loading module %s: %s", mod_basename, err);
151	lt_dlclose(tmpptr);
152	return -1;
153	}
154
155	modp->handle = tmpptr;
156
157	if (EmptyString(modp->version))
158	modp->version = unknown_ver;
159
160	modp->name = xstrdup(mod_basename);
161	dlinkAdd(modp, &modp->node, &modules_list);
162
163	if (modp->modinit)
164	modp->modinit();
165
166	if (warn == 1)
167	{
168	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
169	"Module %s [version: %s handle: %p] loaded.",
170	modp->name, modp->version, tmpptr);
171	ilog(LOG_TYPE_IRCD, "Module %s [version: %s handle: %p] loaded.",
172	modp->name, modp->version, tmpptr);
173	}
174
175	return 0;
176	}
177
178	/*
179	* modules_init
180	*
181	* input - NONE
182	* output - NONE
183	* side effects - The basic module manipulation modules are loaded
184	*/
185	void
186	modules_init(void)
187	{
188	if (lt_dlinit())
189	{
190	ilog(LOG_TYPE_IRCD, "Couldn't initialize the libltdl run time dynamic"
191	" link library. Exiting.");
192	exit(EXIT_FAILURE);
193	}
194	}
195
196	/* mod_find_path()
197	*
198	* input - path
199	* output - none
200	* side effects - returns a module path from path
201	*/
202	static struct module_path *
203	mod_find_path(const char *path)
204	{
205	dlink_node *node = NULL;
206
207	DLINK_FOREACH(node, modules_path.head)
208	{
209	struct module_path *mpath = node->data;
210
211	if (!strcmp(path, mpath->path))
212	return mpath;
213	}
214
215	return NULL;
216	}
217
218	/* mod_add_path()
219	*
220	* input - path
221	* output - NONE
222	* side effects - adds path to list
223	*/
224	void
225	mod_add_path(const char *path)
226	{
227	struct module_path *pathst;
228
229	if (mod_find_path(path))
230	return;
231
232	pathst = xcalloc(sizeof(struct module_path));
233	pathst->path = xstrdup(path);
234	dlinkAdd(pathst, &pathst->node, &modules_path);
235	}
236
237	/* add_conf_module
238	*
239	* input - module name
240	* output - NONE
241	* side effects - adds module to conf_mod
242	*/
243	void
244	add_conf_module(const char *name)
245	{
246	struct module_path *pathst;
247
248	pathst = xcalloc(sizeof(struct module_path));
249	pathst->path = xstrdup(name);
250	dlinkAdd(pathst, &pathst->node, &modules_conf);
251	}
252
253	/* mod_clear_paths()
254	*
255	* input - NONE
256	* output - NONE
257	* side effects - clear the lists of paths and conf modules
258	*/
259	void
260	modules_conf_clear(void)
261	{
262	while (modules_path.head)
263	{
264	struct module_path *path = modules_path.head->data;
265
266	dlinkDelete(&path->node, &modules_path);
267	xfree(path->path);
268	xfree(path);
269	}
270
271	while (modules_conf.head)
272	{
273	struct module_path *path = modules_conf.head->data;
274
275	dlinkDelete(&path->node, &modules_conf);
276	xfree(path->path);
277	xfree(path);
278	}
279	}
280
281	/* findmodule_byname
282	*
283	* input - name of module
284	* output - NULL if not found or pointer to module
285	* side effects - NONE
286	*/
287	struct module *
288	findmodule_byname(const char *name)
289	{
290	dlink_node *node = NULL;
291
292	DLINK_FOREACH(node, modules_list.head)
293	{
294	struct module *modp = node->data;
295
296	if (!strcmp(modp->name, name))
297	return modp;
298	}
299
300	return NULL;
301	}
302
303	/* load_all_modules()
304	*
305	* input - int flag warn
306	* output - NONE
307	* side effects - load all modules found in autoload directory
308	*/
309	void
310	load_all_modules(int warn)
311	{
312	DIR *system_module_dir = NULL;
313	struct dirent *ldirent = NULL;
314	char module_fq_name[HYB_PATH_MAX + 1];
315
316	if ((system_module_dir = opendir(AUTOMODPATH)) == NULL)
317	{
318	ilog(LOG_TYPE_IRCD, "Could not load modules from %s: %s",
319	AUTOMODPATH, strerror(errno));
320	return;
321	}
322
323	while ((ldirent = readdir(system_module_dir)))
324	{
325	if (modules_valid_suffix(ldirent->d_name))
326	{
327	snprintf(module_fq_name, sizeof(module_fq_name), "%s/%s",
328	AUTOMODPATH, ldirent->d_name);
329	load_a_module(module_fq_name, warn);
330	}
331	}
332
333	closedir(system_module_dir);
334	}
335
336	/* load_conf_modules()
337	*
338	* input - NONE
339	* output - NONE
340	* side effects - load modules given in ircd.conf
341	*/
342	void
343	load_conf_modules(void)
344	{
345	dlink_node *node = NULL;
346
347	DLINK_FOREACH(node, modules_conf.head)
348	{
349	struct module_path *mpath = node->data;
350
351	if (findmodule_byname(mpath->path) == NULL)
352	load_one_module(mpath->path);
353	}
354	}
355
356	/* load_core_modules()
357	*
358	* input - int flag warn
359	* output - NONE
360	* side effects - core modules are loaded, if any fail, kill ircd
361	*/
362	void
363	load_core_modules(int warn)
364	{
365	char module_name[HYB_PATH_MAX + 1];
366
367	for (unsigned int i = 0; core_module_table[i]; ++i)
368	{
369	snprintf(module_name, sizeof(module_name), "%s%s",
370	MODPATH, core_module_table[i]);
371
372	if (load_a_module(module_name, warn) == -1)
373	{
374	ilog(LOG_TYPE_IRCD, "Error loading core module %s: terminating ircd",
375	core_module_table[i]);
376	exit(EXIT_FAILURE);
377	}
378	}
379	}
380
381	/* load_one_module()
382	*
383	* input - pointer to path
384	* - flagged as core module or not
385	* output - -1 if error
386	* side effects - module is loaded if found.
387	*/
388	int
389	load_one_module(const char *name)
390	{
391	dlink_node *node = NULL;
392	char path[HYB_PATH_MAX + 1];
393	struct stat statbuf;
394
395	DLINK_FOREACH(node, modules_path.head)
396	{
397	const struct module_path *mpath = node->data;
398
399	snprintf(path, sizeof(path), "%s/%s", mpath->path, name);
400
401	if (!modules_valid_suffix(name))
402	continue;
403
404	if (strstr(path, "../") == NULL &&
405	strstr(path, "/..") == NULL)
406	if (!stat(path, &statbuf))
407	if (S_ISREG(statbuf.st_mode)) /* Regular files only please */
408	return load_a_module(path, 1);
409	}
410
411	sendto_realops_flags(UMODE_SERVNOTICE, L_ALL, SEND_NOTICE,
412	"Cannot locate module %s", name);
413	ilog(LOG_TYPE_IRCD, "Cannot locate module %s", name);
414	return -1;
415	}