6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 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.
52 #include "filesystem.h"
53 #include <wsutil/privileges.h>
54 #include <wsutil/file_util.h>
55 #include "report_err.h"
57 /* linked list of all plugins */
58 plugin *plugin_list = NULL;
61 * add a new plugin to the list
64 * - ENOMEM : memory allocation problem
65 * - EEXIST : the same plugin (i.e. name/version) was already registered.
68 add_plugin(void *handle, gchar *name, gchar *version,
69 void (*register_protoinfo)(void),
70 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));
83 plugin_list = new_plug;
89 /* check if the same name/version is already registered */
90 if (!strcmp(pt_plug->name, name) &&
91 !strcmp(pt_plug->version, version))
96 /* we found the last plugin in the list */
97 if (pt_plug->next == NULL)
100 pt_plug = pt_plug->next;
102 new_plug = (plugin *)g_malloc(sizeof(plugin));
103 if (new_plug == NULL)
105 pt_plug->next = new_plug;
108 new_plug->handle = handle;
109 new_plug->name = name;
110 new_plug->version = version;
111 new_plug->register_protoinfo = register_protoinfo;
112 new_plug->reg_handoff = reg_handoff;
113 new_plug->register_tap_listener = register_tap_listener;
114 new_plug->register_wtap_module = register_wtap_module;
115 new_plug->register_codec_module = register_codec_module;
116 new_plug->next = NULL;
122 * XXX - when we remove support for old-style plugins (which we should
123 * probably do eventually, as all plugins should be written as new-style
124 * ones), we may want to have "init_plugins()" merely save a pointer
125 * to the plugin's "init" routine, just as we save a pointer to its
126 * "reg_handoff" routine, and have a "register_all_plugins()" routine
127 * to go through the list of plugins and call all of them.
129 * Then we'd have "epan_init()", or perhaps even something higher up
130 * in the call tree, call "init_plugins()", and have "proto_init()"
131 * call "register_all_plugins()" right after calling "register_all_protocols()";
132 * this might be a bit cleaner.
135 plugins_scan_dir(const char *dirname)
137 #define FILENAME_LEN 1024
138 WS_DIR *dir; /* scanned directory */
139 WS_DIRENT *file; /* current file */
141 gchar filename[FILENAME_LEN]; /* current file name */
142 GModule *handle; /* handle returned by dlopen */
145 void (*register_protoinfo)(void);
146 void (*reg_handoff)(void);
147 void (*register_tap_listener)(void);
148 void (*register_wtap_module)(void);
149 void (*register_codec_module)(void);
154 if ((dir = ws_dir_open(dirname, 0, NULL)) != NULL)
156 while ((file = ws_dir_read_name(dir)) != NULL)
158 name = ws_dir_get_name(file);
161 * GLib 2.x defines G_MODULE_SUFFIX as the extension used on
162 * this platform for loadable modules.
164 /* skip anything but files with G_MODULE_SUFFIX */
165 dot = strrchr(name, '.');
166 if (dot == NULL || strcmp(dot+1, G_MODULE_SUFFIX) != 0)
169 g_snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
171 if ((handle = g_module_open(filename, 0)) == NULL)
173 report_failure("Couldn't load module %s: %s", filename,
178 if (!g_module_symbol(handle, "version", &gp))
180 report_failure("The plugin %s has no version symbol", name);
181 g_module_close(handle);
187 * Do we have a register routine?
189 if (g_module_symbol(handle, "plugin_register", &gp))
192 * Yes - this plugin includes one or more dissectors.
194 register_protoinfo = gp;
199 * No - no dissectors.
201 register_protoinfo = NULL;
205 * Do we have a reg_handoff routine?
207 if (g_module_symbol(handle, "plugin_reg_handoff", &gp))
217 * No - that's OK even if we have dissectors, as long
218 * as the plugin registers by name *and* there's
219 * a caller looking for that name.
225 * Do we have a register_tap_listener routine?
227 if (g_module_symbol(handle, "plugin_register_tap_listener", &gp))
230 * Yes - this plugin includes one or more taps.
232 register_tap_listener = gp;
239 register_tap_listener = NULL;
243 * Do we have an old-style init routine?
245 if (g_module_symbol(handle, "plugin_init", &gp))
248 * Yes - do we also have a register routine or a
249 * register_tap_listener routine? If so, this is a bogus
250 * hybrid of an old-style and new-style plugin.
252 if (register_protoinfo != NULL || register_tap_listener != NULL)
254 report_failure("The plugin '%s' has an old plugin init routine\nand a new register or register_tap_listener routine.",
256 g_module_close(handle);
261 * It's just an unsupported old-style plugin;
263 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",
265 g_module_close(handle);
270 * Do we have a register_wtap_module routine?
272 if (g_module_symbol(handle, "register_wtap_module", &gp))
274 register_wtap_module = gp;
278 register_wtap_module = NULL;
282 * Do we have a register_codec_module routine?
284 if (g_module_symbol(handle, "register_codec_module", &gp))
286 register_codec_module = gp;
290 register_codec_module = NULL;
294 * Does this dissector do anything useful?
296 if (register_protoinfo == NULL &&
297 register_tap_listener == NULL &&
298 register_wtap_module == NULL &&
299 register_codec_module == NULL )
304 report_failure("The plugin '%s' has neither a register routine, "
305 "a register_tap_listener or a register_wtap_module or a register_codec_module routine",
307 g_module_close(handle);
312 * OK, attempt to add it to the list of plugins.
314 if ((cr = add_plugin(handle, g_strdup(name), version,
315 register_protoinfo, reg_handoff,
316 register_tap_listener,register_wtap_module,register_codec_module)))
319 fprintf(stderr, "The plugin %s, version %s\n"
320 "was found in multiple directories\n", name, version);
322 fprintf(stderr, "Memory allocation problem\n"
323 "when processing plugin %s, version %s\n",
325 g_module_close(handle);
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())
361 if ((dir = ws_dir_open(plugin_dir, 0, NULL)) != NULL)
363 while ((file = ws_dir_read_name(dir)) != NULL)
365 name = ws_dir_get_name(file);
366 if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
367 continue; /* skip "." and ".." */
369 * Get the full path of a ".libs" subdirectory of that
372 plugin_dir_path = g_strdup_printf(
373 "%s" G_DIR_SEPARATOR_S "%s" G_DIR_SEPARATOR_S ".libs",
375 if (test_for_directory(plugin_dir_path) != EISDIR) {
377 * Either it doesn't refer to a directory or it
378 * refers to something that doesn't exist.
380 * Assume that means that the plugins are in
381 * the subdirectory of the plugin directory, not
382 * a ".libs" subdirectory of that subdirectory.
384 g_free(plugin_dir_path);
385 plugin_dir_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s",
388 plugins_scan_dir(plugin_dir_path);
389 g_free(plugin_dir_path);
395 plugins_scan_dir(plugin_dir);
398 * If the program wasn't started with special privileges,
399 * scan the users plugin directory. (Even if we relinquish
400 * them, plugins aren't safe unless we've *permanently*
401 * relinquished them, and we can't do that in Wireshark as,
402 * if we need privileges to start capturing, we'd need to
403 * reclaim them before each time we start capturing.)
405 if (!started_with_special_privs())
407 plugins_pers_dir = get_plugins_pers_dir();
408 plugins_scan_dir(plugins_pers_dir);
409 g_free(plugins_pers_dir);
413 register_all_wiretap_modules();
414 register_all_codecs();
418 register_all_plugin_registrations(void)
423 * For all plugins with register-handoff routines, call the routines.
424 * This is called from "proto_init()"; it must be called after
425 * "register_all_protocols()" and "init_plugins()" are called,
426 * in case one plugin registers itself either with a built-in
427 * dissector or with another plugin; we must first register all
428 * dissectors, whether built-in or plugin, so their dissector tables
429 * are initialized, and only then register all handoffs.
431 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
433 if (pt_plug->register_protoinfo)
434 (pt_plug->register_protoinfo)();
439 register_all_plugin_handoffs(void)
444 * For all plugins with register-handoff routines, call the routines.
445 * This is called from "proto_init()"; it must be called after
446 * "register_all_protocols()" and "init_plugins()" are called,
447 * in case one plugin registers itself either with a built-in
448 * dissector or with another plugin; we must first register all
449 * dissectors, whether built-in or plugin, so their dissector tables
450 * are initialized, and only then register all handoffs.
452 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
454 if (pt_plug->reg_handoff)
455 (pt_plug->reg_handoff)();
460 register_all_plugin_tap_listeners(void)
465 * For all plugins with register-tap-listener routines, call the
468 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
470 if (pt_plug->register_tap_listener)
471 (pt_plug->register_tap_listener)();
476 register_all_wiretap_modules(void)
481 * For all plugins with register_wtap_module routines, call the
484 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
486 if (pt_plug->register_wtap_module)
487 (pt_plug->register_wtap_module)();
492 register_all_codecs(void)
497 * For all plugins with register_wtap_module routines, call the
500 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
502 if (pt_plug->register_codec_module)
503 (pt_plug->register_codec_module)();