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), void (*reg_handoff)(void),
71 void (*register_tap_listener)(void),
72 void (*register_wtap_module)(void),
73 void (*register_codec_module)(void))
75 plugin *new_plug, *pt_plug;
77 pt_plug = plugin_list;
78 if (!pt_plug) /* the list is empty */
80 new_plug = (plugin *)g_malloc(sizeof(plugin));
81 if (new_plug == NULL) return ENOMEM;
82 plugin_list = new_plug;
88 /* check if the same name/version is already registered */
89 if (!strcmp(pt_plug->name, name) &&
90 !strcmp(pt_plug->version, version))
95 /* we found the last plugin in the list */
96 if (pt_plug->next == NULL) break;
98 pt_plug = pt_plug->next;
100 new_plug = (plugin *)g_malloc(sizeof(plugin));
101 if (new_plug == NULL) return ENOMEM;
102 pt_plug->next = new_plug;
105 new_plug->handle = handle;
106 new_plug->name = name;
107 new_plug->version = version;
108 new_plug->register_protoinfo = register_protoinfo;
109 new_plug->reg_handoff = reg_handoff;
110 new_plug->register_tap_listener = register_tap_listener;
111 new_plug->register_wtap_module = register_wtap_module;
112 new_plug->register_codec_module = register_codec_module;
113 new_plug->next = NULL;
119 * XXX - when we remove support for old-style plugins (which we should
120 * probably do eventually, as all plugins should be written as new-style
121 * ones), we may want to have "init_plugins()" merely save a pointer
122 * to the plugin's "init" routine, just as we save a pointer to its
123 * "reg_handoff" routine, and have a "register_all_plugins()" routine
124 * to go through the list of plugins and call all of them.
126 * Then we'd have "epan_init()", or perhaps even something higher up
127 * in the call tree, call "init_plugins()", and have "proto_init()"
128 * call "register_all_plugins()" right after calling "register_all_protocols()";
129 * this might be a bit cleaner.
132 plugins_scan_dir(const char *dirname)
134 #define FILENAME_LEN 1024
135 WS_DIR *dir; /* scanned directory */
136 WS_DIRENT *file; /* current file */
138 gchar filename[FILENAME_LEN]; /* current file name */
139 GModule *handle; /* handle returned by dlopen */
142 void (*register_protoinfo)(void);
143 void (*reg_handoff)(void);
144 void (*register_tap_listener)(void);
145 void (*register_wtap_module)(void);
146 void (*register_codec_module)(void);
151 if ((dir = ws_dir_open(dirname, 0, NULL)) != NULL)
154 while ((file = ws_dir_read_name(dir)) != NULL)
156 name = ws_dir_get_name(file);
159 * GLib 2.x defines G_MODULE_SUFFIX as the extension used on
160 * this platform for loadable modules.
162 /* skip anything but files with G_MODULE_SUFFIX */
163 dot = strrchr(name, '.');
164 if (dot == NULL || strcmp(dot+1, G_MODULE_SUFFIX) != 0)
167 g_snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
169 if ((handle = g_module_open(filename, 0)) == NULL)
171 report_failure("Couldn't load module %s: %s", filename,
176 if (!g_module_symbol(handle, "version", &gp))
178 report_failure("The plugin %s has no version symbol", name);
179 g_module_close(handle);
185 * Do we have a register routine?
187 if (g_module_symbol(handle, "plugin_register", &gp))
190 * Yes - this plugin includes one or more dissectors.
192 register_protoinfo = gp;
197 * No - no dissectors.
199 register_protoinfo = NULL;
203 * Do we have a reg_handoff routine?
205 if (g_module_symbol(handle, "plugin_reg_handoff", &gp))
215 * No - that's OK even if we have dissectors, as long
216 * as the plugin registers by name *and* there's
217 * a caller looking for that name.
223 * Do we have a register_tap_listener routine?
225 if (g_module_symbol(handle, "plugin_register_tap_listener", &gp))
228 * Yes - this plugin includes one or more taps.
230 register_tap_listener = gp;
237 register_tap_listener = NULL;
241 * Do we have an old-style init routine?
243 if (g_module_symbol(handle, "plugin_init", &gp))
246 * Yes - do we also have a register routine or a
247 * register_tap_listener routine? If so, this is a bogus
248 * hybrid of an old-style and new-style plugin.
250 if (register_protoinfo != NULL || register_tap_listener != NULL)
252 report_failure("The plugin '%s' has an old plugin init routine\nand a new register or register_tap_listener routine.",
254 g_module_close(handle);
259 * It's just an unsupported old-style plugin;
261 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",
263 g_module_close(handle);
268 * Do we have a register_wtap_module routine?
270 if (g_module_symbol(handle, "register_wtap_module", &gp))
272 register_wtap_module = gp;
274 register_wtap_module = NULL;
278 * Do we have a register_codec_module routine?
280 if (g_module_symbol(handle, "register_codec_module", &gp))
282 register_codec_module = gp;
284 register_codec_module = NULL;
288 * Does this dissector do anything useful?
290 if (register_protoinfo == NULL &&
291 register_tap_listener == NULL &&
292 register_wtap_module == NULL &&
293 register_codec_module == NULL )
298 report_failure("The plugin '%s' has neither a register routine, "
299 "a register_tap_listener or a register_wtap_module or a register_codec_module routine",
301 g_module_close(handle);
306 * OK, attempt to add it to the list of plugins.
308 if ((cr = add_plugin(handle, g_strdup(name), version,
309 register_protoinfo, reg_handoff,
310 register_tap_listener,register_wtap_module,register_codec_module)))
313 fprintf(stderr, "The plugin %s, version %s\n"
314 "was found in multiple directories\n", name, version);
316 fprintf(stderr, "Memory allocation problem\n"
317 "when processing plugin %s, version %s\n",
319 g_module_close(handle);
328 /* get the personal plugin dir */
329 /* Return value is malloced so the caller should g_free() it. */
330 char *get_plugins_pers_dir(void)
332 return get_persconffile_path(PLUGINS_DIR_NAME, FALSE, FALSE);
341 const char *plugin_dir;
343 char *plugin_dir_path;
344 char *plugins_pers_dir;
345 WS_DIR *dir; /* scanned directory */
346 WS_DIRENT *file; /* current file */
348 if (plugin_list == NULL) /* ensure init_plugins is only run once */
351 * Scan the global plugin directory.
352 * If we're running from a build directory, scan the subdirectories
353 * of that directory, as the global plugin directory is the
354 * "plugins" directory of the source tree, and the subdirectories
355 * are the source directories for the plugins, with the plugins
356 * built in those subdirectories.
358 plugin_dir = get_plugin_dir();
359 if (running_in_build_directory()) {
360 if ((dir = ws_dir_open(plugin_dir, 0, NULL)) != NULL) {
361 while ((file = ws_dir_read_name(dir)) != NULL) {
362 name = ws_dir_get_name(file);
363 if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
364 continue; /* skip "." and ".." */
366 * Get the full path of a ".libs" subdirectory of that
369 plugin_dir_path = g_strdup_printf(
370 "%s" G_DIR_SEPARATOR_S "%s" G_DIR_SEPARATOR_S ".libs",
372 if (test_for_directory(plugin_dir_path) != EISDIR) {
374 * Either it doesn't refer to a directory or it
375 * refers to something that doesn't exist.
377 * Assume that means that the plugins are in
378 * the subdirectory of the plugin directory, not
379 * a ".libs" subdirectory of that subdirectory.
381 g_free(plugin_dir_path);
382 plugin_dir_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s",
385 plugins_scan_dir(plugin_dir_path);
386 g_free(plugin_dir_path);
390 plugins_scan_dir(plugin_dir);
393 * If the program wasn't started with special privileges,
394 * scan the users plugin directory. (Even if we relinquish
395 * them, plugins aren't safe unless we've *permanently*
396 * relinquished them, and we can't do that in Wireshark as,
397 * if we need privileges to start capturing, we'd need to
398 * reclaim them before each time we start capturing.)
400 if (!started_with_special_privs()) {
401 plugins_pers_dir = get_plugins_pers_dir();
402 plugins_scan_dir(plugins_pers_dir);
403 g_free(plugins_pers_dir);
406 register_all_wiretap_modules();
407 register_all_codecs();
411 register_all_plugin_registrations(void)
416 * For all plugins with register-handoff routines, call the routines.
417 * This is called from "proto_init()"; it must be called after
418 * "register_all_protocols()" and "init_plugins()" are called,
419 * in case one plugin registers itself either with a built-in
420 * dissector or with another plugin; we must first register all
421 * dissectors, whether built-in or plugin, so their dissector tables
422 * are initialized, and only then register all handoffs.
424 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
426 if (pt_plug->register_protoinfo)
427 (pt_plug->register_protoinfo)();
432 register_all_plugin_handoffs(void)
437 * For all plugins with register-handoff routines, call the routines.
438 * This is called from "proto_init()"; it must be called after
439 * "register_all_protocols()" and "init_plugins()" are called,
440 * in case one plugin registers itself either with a built-in
441 * dissector or with another plugin; we must first register all
442 * dissectors, whether built-in or plugin, so their dissector tables
443 * are initialized, and only then register all handoffs.
445 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
447 if (pt_plug->reg_handoff)
448 (pt_plug->reg_handoff)();
453 register_all_plugin_tap_listeners(void)
458 * For all plugins with register-tap-listener routines, call the
461 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
463 if (pt_plug->register_tap_listener)
464 (pt_plug->register_tap_listener)();
469 register_all_wiretap_modules(void)
474 * For all plugins with register_wtap_module routines, call the
477 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
479 if (pt_plug->register_wtap_module)
480 (pt_plug->register_wtap_module)();
485 register_all_codecs(void)
490 * For all plugins with register_wtap_module routines, call the
493 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
495 if (pt_plug->register_codec_module)
496 (pt_plug->register_codec_module)();