6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1999 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
51 #include "filesystem.h"
52 #include <wsutil/privileges.h>
53 #include <wsutil/file_util.h>
54 #include "report_err.h"
56 /* linked list of all plugins */
59 #define PLUGINS_DIR_NAME "plugins"
62 * add a new plugin to the list
65 * - ENOMEM : memory allocation problem
66 * - EEXIST : the same plugin (i.e. name/version) was already registered.
69 add_plugin(void *handle, gchar *name, gchar *version,
70 void (*register_protoinfo)(void),
71 void (*reg_handoff)(void),
72 void (*register_tap_listener)(void),
73 void (*register_wtap_module)(void),
74 void (*register_codec_module)(void))
76 plugin *new_plug, *pt_plug;
78 pt_plug = plugin_list;
79 if (!pt_plug) /* the list is empty */
81 new_plug = (plugin *)g_malloc(sizeof(plugin));
84 plugin_list = new_plug;
90 /* check if the same name/version is already registered */
91 if (!strcmp(pt_plug->name, name) &&
92 !strcmp(pt_plug->version, version))
97 /* we found the last plugin in the list */
98 if (pt_plug->next == NULL)
101 pt_plug = pt_plug->next;
103 new_plug = (plugin *)g_malloc(sizeof(plugin));
104 if (new_plug == NULL)
106 pt_plug->next = new_plug;
109 new_plug->handle = handle;
110 new_plug->name = name;
111 new_plug->version = version;
112 new_plug->register_protoinfo = register_protoinfo;
113 new_plug->reg_handoff = reg_handoff;
114 new_plug->register_tap_listener = register_tap_listener;
115 new_plug->register_wtap_module = register_wtap_module;
116 new_plug->register_codec_module = register_codec_module;
117 new_plug->next = NULL;
123 * XXX - when we remove support for old-style plugins (which we should
124 * probably do eventually, as all plugins should be written as new-style
125 * ones), we may want to have "init_plugins()" merely save a pointer
126 * to the plugin's "init" routine, just as we save a pointer to its
127 * "reg_handoff" routine, and have a "register_all_plugins()" routine
128 * to go through the list of plugins and call all of them.
130 * Then we'd have "epan_init()", or perhaps even something higher up
131 * in the call tree, call "init_plugins()", and have "proto_init()"
132 * call "register_all_plugins()" right after calling "register_all_protocols()";
133 * this might be a bit cleaner.
136 plugins_scan_dir(const char *dirname)
138 #define FILENAME_LEN 1024
139 WS_DIR *dir; /* scanned directory */
140 WS_DIRENT *file; /* current file */
142 gchar filename[FILENAME_LEN]; /* current file name */
143 GModule *handle; /* handle returned by dlopen */
146 void (*register_protoinfo)(void);
147 void (*reg_handoff)(void);
148 void (*register_tap_listener)(void);
149 void (*register_wtap_module)(void);
150 void (*register_codec_module)(void);
155 if ((dir = ws_dir_open(dirname, 0, NULL)) != NULL)
157 while ((file = ws_dir_read_name(dir)) != NULL)
159 name = ws_dir_get_name(file);
162 * GLib 2.x defines G_MODULE_SUFFIX as the extension used on
163 * this platform for loadable modules.
165 /* skip anything but files with G_MODULE_SUFFIX */
166 dot = strrchr(name, '.');
167 if (dot == NULL || strcmp(dot+1, G_MODULE_SUFFIX) != 0)
170 g_snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
172 if ((handle = g_module_open(filename, 0)) == NULL)
174 report_failure("Couldn't load module %s: %s", filename,
179 if (!g_module_symbol(handle, "version", &gp))
181 report_failure("The plugin %s has no version symbol", name);
182 g_module_close(handle);
188 * Do we have a register routine?
190 if (g_module_symbol(handle, "plugin_register", &gp))
193 * Yes - this plugin includes one or more dissectors.
195 register_protoinfo = gp;
200 * No - no dissectors.
202 register_protoinfo = NULL;
206 * Do we have a reg_handoff routine?
208 if (g_module_symbol(handle, "plugin_reg_handoff", &gp))
218 * No - that's OK even if we have dissectors, as long
219 * as the plugin registers by name *and* there's
220 * a caller looking for that name.
226 * Do we have a register_tap_listener routine?
228 if (g_module_symbol(handle, "plugin_register_tap_listener", &gp))
231 * Yes - this plugin includes one or more taps.
233 register_tap_listener = gp;
240 register_tap_listener = NULL;
244 * Do we have an old-style init routine?
246 if (g_module_symbol(handle, "plugin_init", &gp))
249 * Yes - do we also have a register routine or a
250 * register_tap_listener routine? If so, this is a bogus
251 * hybrid of an old-style and new-style plugin.
253 if (register_protoinfo != NULL || register_tap_listener != NULL)
255 report_failure("The plugin '%s' has an old plugin init routine\nand a new register or register_tap_listener routine.",
257 g_module_close(handle);
262 * It's just an unsupported old-style plugin;
264 report_failure("The plugin '%s' has an old plugin init routine. Support has been dropped.\n Information on how to update your plugin is available at \nhttp://anonsvn.wireshark.org/wireshark/trunk/doc/README.plugins",
266 g_module_close(handle);
271 * Do we have a register_wtap_module routine?
273 if (g_module_symbol(handle, "register_wtap_module", &gp))
275 register_wtap_module = gp;
279 register_wtap_module = NULL;
283 * Do we have a register_codec_module routine?
285 if (g_module_symbol(handle, "register_codec_module", &gp))
287 register_codec_module = gp;
291 register_codec_module = NULL;
295 * Does this dissector do anything useful?
297 if (register_protoinfo == NULL &&
298 register_tap_listener == NULL &&
299 register_wtap_module == NULL &&
300 register_codec_module == NULL )
305 report_failure("The plugin '%s' has neither a register routine, "
306 "a register_tap_listener or a register_wtap_module or a register_codec_module routine",
308 g_module_close(handle);
313 * OK, attempt to add it to the list of plugins.
315 if ((cr = add_plugin(handle, g_strdup(name), version,
316 register_protoinfo, reg_handoff,
317 register_tap_listener,register_wtap_module,register_codec_module)))
320 fprintf(stderr, "The plugin %s, version %s\n"
321 "was found in multiple directories\n", name, version);
323 fprintf(stderr, "Memory allocation problem\n"
324 "when processing plugin %s, version %s\n",
326 g_module_close(handle);
335 /* get the personal plugin dir */
336 /* Return value is malloced so the caller should g_free() it. */
337 char *get_plugins_pers_dir(void)
339 return get_persconffile_path(PLUGINS_DIR_NAME, FALSE, FALSE);
348 const char *plugin_dir;
350 char *plugin_dir_path;
351 char *plugins_pers_dir;
352 WS_DIR *dir; /* scanned directory */
353 WS_DIRENT *file; /* current file */
355 if (plugin_list == NULL) /* ensure init_plugins is only run once */
358 * Scan the global plugin directory.
359 * If we're running from a build directory, scan the subdirectories
360 * of that directory, as the global plugin directory is the
361 * "plugins" directory of the source tree, and the subdirectories
362 * are the source directories for the plugins, with the plugins
363 * built in those subdirectories.
365 plugin_dir = get_plugin_dir();
366 if (running_in_build_directory())
368 if ((dir = ws_dir_open(plugin_dir, 0, NULL)) != NULL)
370 while ((file = ws_dir_read_name(dir)) != NULL)
372 name = ws_dir_get_name(file);
373 if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
374 continue; /* skip "." and ".." */
376 * Get the full path of a ".libs" subdirectory of that
379 plugin_dir_path = g_strdup_printf(
380 "%s" G_DIR_SEPARATOR_S "%s" G_DIR_SEPARATOR_S ".libs",
382 if (test_for_directory(plugin_dir_path) != EISDIR) {
384 * Either it doesn't refer to a directory or it
385 * refers to something that doesn't exist.
387 * Assume that means that the plugins are in
388 * the subdirectory of the plugin directory, not
389 * a ".libs" subdirectory of that subdirectory.
391 g_free(plugin_dir_path);
392 plugin_dir_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s",
395 plugins_scan_dir(plugin_dir_path);
396 g_free(plugin_dir_path);
402 plugins_scan_dir(plugin_dir);
405 * If the program wasn't started with special privileges,
406 * scan the users plugin directory. (Even if we relinquish
407 * them, plugins aren't safe unless we've *permanently*
408 * relinquished them, and we can't do that in Wireshark as,
409 * if we need privileges to start capturing, we'd need to
410 * reclaim them before each time we start capturing.)
412 if (!started_with_special_privs())
414 plugins_pers_dir = get_plugins_pers_dir();
415 plugins_scan_dir(plugins_pers_dir);
416 g_free(plugins_pers_dir);
420 register_all_wiretap_modules();
421 register_all_codecs();
425 register_all_plugin_registrations(void)
430 * For all plugins with register-handoff routines, call the routines.
431 * This is called from "proto_init()"; it must be called after
432 * "register_all_protocols()" and "init_plugins()" are called,
433 * in case one plugin registers itself either with a built-in
434 * dissector or with another plugin; we must first register all
435 * dissectors, whether built-in or plugin, so their dissector tables
436 * are initialized, and only then register all handoffs.
438 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
440 if (pt_plug->register_protoinfo)
441 (pt_plug->register_protoinfo)();
446 register_all_plugin_handoffs(void)
451 * For all plugins with register-handoff routines, call the routines.
452 * This is called from "proto_init()"; it must be called after
453 * "register_all_protocols()" and "init_plugins()" are called,
454 * in case one plugin registers itself either with a built-in
455 * dissector or with another plugin; we must first register all
456 * dissectors, whether built-in or plugin, so their dissector tables
457 * are initialized, and only then register all handoffs.
459 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
461 if (pt_plug->reg_handoff)
462 (pt_plug->reg_handoff)();
467 register_all_plugin_tap_listeners(void)
472 * For all plugins with register-tap-listener routines, call the
475 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
477 if (pt_plug->register_tap_listener)
478 (pt_plug->register_tap_listener)();
483 register_all_wiretap_modules(void)
488 * For all plugins with register_wtap_module routines, call the
491 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
493 if (pt_plug->register_wtap_module)
494 (pt_plug->register_wtap_module)();
499 register_all_codecs(void)
504 * For all plugins with register_wtap_module routines, call the
507 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
509 if (pt_plug->register_codec_module)
510 (pt_plug->register_codec_module)();