4 * $Id: plugins.c,v 1.77 2003/09/24 18:35:07 guy Exp $
6 * Ethereal - Network traffic analyzer
7 * By Gerald Combs <gerald@ethereal.com>
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.
29 #ifdef NEED_SNPRINTF_H
30 # include "snprintf.h"
51 #ifdef HAVE_SYS_STAT_H
59 #include "filesystem.h"
61 #ifdef PLUGINS_NEED_ADDRESS_TABLE
62 #include "conversation.h"
63 #include "reassemble.h"
65 #include "packet-giop.h"
66 #include "packet-tpkt.h"
67 #include "packet-tcp.h"
70 #include "packet-per.h"
71 #include "plugins/plugin_table.h"
72 static plugin_address_table_t patable = {
73 /* file generated by plugin_gen.py */
74 #include "plugins/Xass-list"
78 /* linked list of all plugins */
81 static gchar *user_plug_dir = NULL;
83 #define PLUGINS_DIR_NAME "plugins"
86 * add a new plugin to the list
89 * - ENOMEM : memory allocation problem
90 * - EEXIST : the same plugin (i.e. name/version) was already registered.
93 add_plugin(void *handle, gchar *name, gchar *version,
94 void (*reg_handoff)(void))
96 plugin *new_plug, *pt_plug;
98 pt_plug = plugin_list;
99 if (!pt_plug) /* the list is empty */
101 new_plug = (plugin *)g_malloc(sizeof(plugin));
102 if (new_plug == NULL) return ENOMEM;
103 plugin_list = new_plug;
109 /* check if the same name/version is already registered */
110 if (!strcmp(pt_plug->name, name) &&
111 !strcmp(pt_plug->version, version))
116 /* we found the last plugin in the list */
117 if (pt_plug->next == NULL) break;
119 pt_plug = pt_plug->next;
121 new_plug = (plugin *)g_malloc(sizeof(plugin));
122 if (new_plug == NULL) return ENOMEM;
123 pt_plug->next = new_plug;
126 new_plug->handle = handle;
127 new_plug->name = name;
128 new_plug->version = version;
129 new_plug->reg_handoff = reg_handoff;
130 new_plug->next = NULL;
135 * XXX - when we remove support for old-style plugins (which we should
136 * probably do eventually, as all plugins should be written as new-style
137 * ones), we may want to have "init_plugins()" merely save a pointer
138 * to the plugin's "init" routine, just as we save a pointer to its
139 * "reg_handoff" routine, and have a "register_all_plugins()" routine
140 * to go through the list of plugins and call all of them.
142 * Then we'd have "epan_init()", or perhaps even something higher up
143 * in the call tree, call "init_plugins()", and have "proto_init()"
144 * call "register_all_plugins()" right after calling "register_all_protocols()";
145 * this might be a bit cleaner.
148 plugins_scan_dir(const char *dirname)
150 #define FILENAME_LEN 1024
151 #if GLIB_MAJOR_VERSION < 2
152 gchar *hack_path; /* pathname used to construct lt_lib_ext */
153 gchar *lt_lib_ext; /* extension for loadable modules */
154 DIR *dir; /* scanned directory */
155 struct dirent *file; /* current file */
158 GDir *dir; /* scanned directory */
162 gchar filename[FILENAME_LEN]; /* current file name */
163 GModule *handle; /* handle returned by dlopen */
165 void (*init)(void *);
166 void (*reg_handoff)(void);
170 #if GLIB_MAJOR_VERSION < 2
172 * We find the extension used on this platform for loadable modules
173 * by the sneaky hack of calling "g_module_build_path" to build
174 * the pathname for a module with an empty directory name and
175 * empty module name, and then search for the last "." and use
176 * everything from the last "." on.
178 hack_path = g_module_build_path("", "");
179 lt_lib_ext = strrchr(hack_path, '.');
180 if (lt_lib_ext == NULL)
183 * Does this mean there *is* no extension? Assume so.
185 * XXX - the code below assumes that all loadable modules have
191 if ((dir = opendir(dirname)) != NULL)
193 while ((file = readdir(dir)) != NULL)
195 /* don't try to open "." and ".." */
196 if (!(strcmp(file->d_name, "..") &&
197 strcmp(file->d_name, "."))) continue;
199 /* skip anything but files with lt_lib_ext */
200 dot = strrchr(file->d_name, '.');
201 if (dot == NULL || strcmp(dot, lt_lib_ext) != 0) continue;
203 snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
204 dirname, file->d_name);
205 name = (gchar *)file->d_name;
208 * GLib 2.x defines G_MODULE_SUFFIX as the extension used on this
209 * platform for loadable modules.
211 dummy = g_malloc(sizeof(GError *));
213 if ((dir = g_dir_open(dirname, 0, dummy)) != NULL)
215 while ((name = g_dir_read_name(dir)) != NULL)
217 /* skip anything but files with G_MODULE_SUFFIX */
218 dot = strrchr(name, '.');
219 if (dot == NULL || strcmp(dot+1, G_MODULE_SUFFIX) != 0) continue;
221 snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
224 if ((handle = g_module_open(filename, 0)) == NULL)
226 g_warning("Couldn't load module %s: %s", filename,
230 if (g_module_symbol(handle, "version", (gpointer*)&version) == FALSE)
232 g_warning("The plugin %s has no version symbol", name);
233 g_module_close(handle);
238 * Old-style dissectors don't have a "plugin_reg_handoff()"
239 * routine; we no longer support them.
241 * New-style dissectors have one, because, otherwise, there's
242 * no way for them to arrange that they ever be called.
244 if (g_module_symbol(handle, "plugin_reg_handoff",
245 (gpointer*)®_handoff))
248 * We require it to have a "plugin_init()" routine.
250 if (!g_module_symbol(handle, "plugin_init", (gpointer*)&init))
252 g_warning("The plugin %s has a plugin_reg_handoff symbol but no plugin_init routine",
254 g_module_close(handle);
259 * We have a "plugin_reg_handoff()" routine, so we don't
260 * need the protocol, filter string, or dissector pointer.
262 if ((cr = add_plugin(handle, g_strdup(name), version,
266 fprintf(stderr, "The plugin %s, version %s\n"
267 "was found in multiple directories\n", name, version);
269 fprintf(stderr, "Memory allocation problem\n"
270 "when processing plugin %s, version %s\n",
272 g_module_close(handle);
277 * Call its init routine.
279 #ifdef PLUGINS_NEED_ADDRESS_TABLE
288 * This is an old-style dissector; warn that it won't
289 * be used, as those aren't supported.
292 "The plugin %s, version %s is an old-style plugin;\n"
293 "Those are no longer supported.\n", name, version);
296 #if GLIB_MAJOR_VERSION < 2
303 g_clear_error(dummy);
312 init_plugins(const char *plugin_dir)
315 const char *datafile_dir;
316 char *install_plugin_dir;
319 if (plugin_list == NULL) /* ensure init_plugins is only run once */
323 * On Windows, the data file directory is the installation
324 * directory; the plugins are stored under it.
326 * Assume we're running the installed version of Ethereal;
327 * on Windows, the data file directory is the directory
328 * in which the Ethereal binary resides.
330 datafile_dir = get_datafile_dir();
331 install_plugin_dir = g_malloc(strlen(datafile_dir) + strlen("plugins") +
332 strlen(VERSION) + 3);
333 sprintf(install_plugin_dir, "%s\\plugins\\%s", datafile_dir, VERSION);
336 * Make sure that pathname refers to a directory.
338 if (test_for_directory(install_plugin_dir) != EISDIR) {
340 * Either it doesn't refer to a directory or it
341 * refers to something that doesn't exist.
343 * Assume that means we're running, for example,
344 * a version of Ethereal we've built in a source
345 * directory, and fall back on the default
346 * installation directory, so you can put the plugins
347 * somewhere so they can be used with this version
350 * XXX - should we, instead, have the Windows build
351 * procedure create a subdirectory of the "plugins"
352 * source directory, and copy the plugin DLLs there,
353 * so that you use the plugins from the build tree?
356 g_strdup("C:\\Program Files\\Ethereal\\plugins\\" VERSION);
360 * Scan that directory.
362 plugins_scan_dir(install_plugin_dir);
363 g_free(install_plugin_dir);
366 * Scan the plugin directory.
368 plugins_scan_dir(plugin_dir);
371 user_plug_dir = get_persconffile_path(PLUGINS_DIR_NAME, FALSE);
372 plugins_scan_dir(user_plug_dir);
377 register_all_plugin_handoffs(void)
382 * For all new-style plugins, call the register-handoff routine.
383 * This is called from "proto_init()"; it must be called after
384 * "register_all_protocols()" and "init_plugins()" are called,
385 * in case one plugin registers itself either with a built-in
386 * dissector or with another plugin; we must first register all
387 * dissectors, whether built-in or plugin, so their dissector tables
388 * are initialized, and only then register all handoffs.
390 * We treat those protocols as always being enabled; they should
391 * use the standard mechanism for enabling/disabling protocols, not
392 * the plugin-specific mechanism.
394 for (pt_plug = plugin_list; pt_plug != NULL; pt_plug = pt_plug->next)
395 (pt_plug->reg_handoff)();