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wireshark/wsutil/plugins.c

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/* plugins.c
* plugin routines
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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.
*/
#include "config.h"
#ifdef HAVE_PLUGINS
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <glib.h>
#include <gmodule.h>
#include <wsutil/filesystem.h>
#include <wsutil/privileges.h>
#include <wsutil/file_util.h>
#include <wsutil/report_message.h>
#include <wsutil/plugins.h>
#include <wsutil/ws_printf.h> /* ws_debug_printf */
/* linked list of all plugins */
typedef struct _plugin {
GModule *handle; /* handle returned by g_module_open */
gchar *name; /* plugin name */
gchar *version; /* plugin version */
guint32 types; /* bitmask of plugin types this plugin supports */
struct _plugin *next; /* forward link */
} plugin;
static plugin *plugin_list = NULL;
/*
* Add a new plugin type.
* Takes a callback routine as an argument; it is called for each plugin
* we find, and handed a handle for the plugin, the name of the plugin,
* and the version string for the plugin. The plugin returns TRUE if
* it's a plugin for that type and FALSE if not.
*/
typedef struct {
const char *type;
plugin_callback callback;
guint type_val;
} plugin_type;
static GSList *plugin_types = NULL;
void
add_plugin_type(const char *type, plugin_callback callback)
{
plugin_type *new_type;
static guint type_val;
if (type_val >= 32) {
/*
* There's a bitmask of types that a plugin provides, and it's
* 32 bits, so we don't support types > 31.
*/
report_failure("At most 32 plugin types can be supported, so the plugin type '%s' won't be supported.",
type);
return;
}
new_type = (plugin_type *)g_malloc(sizeof (plugin_type));
new_type->type = type;
new_type->callback = callback;
new_type->type_val = type_val;
plugin_types = g_slist_append(plugin_types, new_type);
type_val++;
}
/*
* add a new plugin to the list
* returns :
* - 0 : OK
* - EEXIST : the same plugin (i.e. name/version) was already registered.
*/
static int
add_plugin(plugin *new_plug)
{
plugin *pt_plug;
pt_plug = plugin_list;
if (!pt_plug) /* the list is empty */
{
plugin_list = new_plug;
}
else
{
while (1)
{
/* check if the same name/version is already registered */
if (strcmp(pt_plug->name, new_plug->name) == 0 &&
strcmp(pt_plug->version, new_plug->version) == 0)
{
return EEXIST;
}
/* we found the last plugin in the list */
if (pt_plug->next == NULL)
break;
pt_plug = pt_plug->next;
}
pt_plug->next = new_plug;
}
return 0;
}
static void
call_plugin_callback(gpointer data, gpointer user_data)
{
plugin_type *type = (plugin_type *)data;
plugin *new_plug = (plugin *)user_data;
if ((*type->callback)(new_plug->handle)) {
/* The plugin supports this type */
new_plug->types |= 1 << type->type_val;
}
}
static void
plugins_scan_dir(const char *dirname, plugin_load_failure_mode mode)
{
#define FILENAME_LEN 1024
WS_DIR *dir; /* scanned directory */
WS_DIRENT *file; /* current file */
const char *name;
gchar filename[FILENAME_LEN]; /* current file name */
GModule *handle; /* handle returned by g_module_open */
gpointer gp;
plugin *new_plug;
gchar *dot;
int cr;
if (!g_file_test(dirname, G_FILE_TEST_EXISTS) || !g_file_test(dirname, G_FILE_TEST_IS_DIR)) {
return;
}
if ((dir = ws_dir_open(dirname, 0, NULL)) != NULL)
{
while ((file = ws_dir_read_name(dir)) != NULL)
{
name = ws_dir_get_name(file);
/*
* GLib 2.x defines G_MODULE_SUFFIX as the extension used on
* this platform for loadable modules.
*/
/* skip anything but files with G_MODULE_SUFFIX */
dot = strrchr(name, '.');
if (dot == NULL || strcmp(dot+1, G_MODULE_SUFFIX) != 0)
continue;
#if WIN32
if (strncmp(name, "nordic_ble.dll", 14) == 0)
/*
* Skip the Nordic BLE Sniffer dll on WIN32 because
* the dissector has been added as internal.
*/
continue;
#endif
g_snprintf(filename, FILENAME_LEN, "%s" G_DIR_SEPARATOR_S "%s",
dirname, name);
if ((handle = g_module_open(filename, G_MODULE_BIND_LOCAL)) == NULL)
{
/*
* Only report load failures if we were asked to.
*
* XXX - we really should put different types of plugins
* (libwiretap, libwireshark) in different subdirectories,
* give libwiretap and libwireshark init routines that
* load the plugins, and have them scan the appropriate
* subdirectories so tha we don't even *try* to, for
* example, load libwireshark plugins in programs that
* only use libwiretap.
*/
if (mode == REPORT_LOAD_FAILURE) {
report_failure("Couldn't load module %s: %s", filename,
g_module_error());
}
continue;
}
if (!g_module_symbol(handle, "version", &gp))
{
report_failure("The plugin %s has no version symbol", name);
g_module_close(handle);
continue;
}
new_plug = (plugin *)g_malloc(sizeof(plugin));
new_plug->handle = handle;
new_plug->name = g_strdup(name);
new_plug->version = (char *)gp;
new_plug->types = 0;
new_plug->next = NULL;
/*
* Hand the plugin to each of the plugin type callbacks.
*/
g_slist_foreach(plugin_types, call_plugin_callback, new_plug);
/*
* Does this dissector do anything useful?
*/
if (new_plug->types == 0)
{
/*
* No.
*
* Only report this failure if we were asked to; it might
* just mean that it's a plugin type that this program
* doesn't support, such as a libwireshark plugin in
* a program that doesn't use libwireshark.
*
* XXX - we really should put different types of plugins
* (libwiretap, libwireshark) in different subdirectories,
* give libwiretap and libwireshark init routines that
* load the plugins, and have them scan the appropriate
* subdirectories so tha we don't even *try* to, for
* example, load libwireshark plugins in programs that
* only use libwiretap.
*/
if (mode == REPORT_LOAD_FAILURE) {
report_failure("The plugin '%s' has no registration routines",
name);
}
g_module_close(handle);
g_free(new_plug->name);
g_free(new_plug);
continue;
}
/*
* OK, attempt to add it to the list of plugins.
*/
cr = add_plugin(new_plug);
if (cr != 0)
{
g_assert(cr == EEXIST);
fprintf(stderr, "The plugin '%s' version %s "
"was found in multiple directories.\n",
new_plug->name, new_plug->version);
g_module_close(handle);
g_free(new_plug->name);
g_free(new_plug);
continue;
}
}
ws_dir_close(dir);
}
}
/*
* Scan for plugins.
*/
void
scan_plugins(plugin_load_failure_mode mode)
{
const char *plugin_dir;
const char *name;
char *plugin_dir_path;
WS_DIR *dir; /* scanned directory */
WS_DIRENT *file; /* current file */
if (plugin_list == NULL) /* only scan for plugins once */
{
/*
* Scan the global plugin directory.
* If we're running from a build directory, scan the "plugins"
* subdirectory, as that's where plugins are located in an
* out-of-tree build. If we find subdirectories scan those since
* they will contain plugins in the case of an in-tree build.
*/
plugin_dir = get_plugin_dir();
if (plugin_dir == NULL)
{
/* We couldn't find the plugin directory. */
return;
}
if (running_in_build_directory())
{
if ((dir = ws_dir_open(plugin_dir, 0, NULL)) != NULL)
{
plugins_scan_dir(plugin_dir, mode);
while ((file = ws_dir_read_name(dir)) != NULL)
{
name = ws_dir_get_name(file);
if (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
continue; /* skip "." and ".." */
/*
* Get the full path of a ".libs" subdirectory of that
* directory.
*/
plugin_dir_path = g_strdup_printf(
"%s" G_DIR_SEPARATOR_S "%s" G_DIR_SEPARATOR_S ".libs",
plugin_dir, name);
if (test_for_directory(plugin_dir_path) != EISDIR) {
/*
* Either it doesn't refer to a directory or it
* refers to something that doesn't exist.
*
* Assume that means that the plugins are in
* the subdirectory of the plugin directory, not
* a ".libs" subdirectory of that subdirectory.
*/
g_free(plugin_dir_path);
plugin_dir_path = g_strdup_printf("%s" G_DIR_SEPARATOR_S "%s",
plugin_dir, name);
}
plugins_scan_dir(plugin_dir_path, mode);
g_free(plugin_dir_path);
}
ws_dir_close(dir);
}
}
else
plugins_scan_dir(plugin_dir, mode);
/*
* If the program wasn't started with special privileges,
* scan the users plugin directory. (Even if we relinquish
* them, plugins aren't safe unless we've *permanently*
* relinquished them, and we can't do that in Wireshark as,
* if we need privileges to start capturing, we'd need to
* reclaim them before each time we start capturing.)
*/
if (!started_with_special_privs())
{
plugins_scan_dir(get_plugins_pers_dir(), mode);
}
}
}
/*
* Iterate over all plugins, calling a callback with information about
* the plugin.
*/
typedef struct {
plugin *pt_plug;
GString *types;
const char *sep;
} type_callback_info;
static void
add_plugin_type_description(gpointer data, gpointer user_data)
{
plugin_type *type = (plugin_type *)data;
type_callback_info *info = (type_callback_info *)user_data;
/*
* If the plugin handles this type, add the type to the list of types.
*/
if (info->pt_plug->types & (1 << type->type_val)) {
g_string_append_printf(info->types, "%s%s", info->sep, type->type);
info->sep = ", ";
}
}
WS_DLL_PUBLIC void
plugins_get_descriptions(plugin_description_callback callback, void *user_data)
{
type_callback_info info;
info.types = NULL; /* Certain compiler suites need a init state for this variable */
for (info.pt_plug = plugin_list; info.pt_plug != NULL;
info.pt_plug = info.pt_plug->next)
{
info.sep = "";
info.types = g_string_new("");
/*
* Build a list of all the plugin types.
*/
g_slist_foreach(plugin_types, add_plugin_type_description, &info);
/*
* And hand the information to the callback.
*/
callback(info.pt_plug->name, info.pt_plug->version, info.types->str,
g_module_name(info.pt_plug->handle), user_data);
g_string_free(info.types, TRUE);
}
}
static void
print_plugin_description(const char *name, const char *version,
const char *description, const char *filename,
void *user_data _U_)
{
ws_debug_printf("%s\t%s\t%s\t%s\n", name, version, description, filename);
}
void
plugins_dump_all(void)
{
plugins_get_descriptions(print_plugin_description, NULL);
}
static void
free_plugin_type(gpointer p, gpointer user_data _U_)
{
g_free(p);
}
void
plugins_cleanup(void)
{
plugin* cur, *next;
for (cur = plugin_list; cur != NULL; cur = next) {
next = cur->next;
g_free(cur->name);
g_free(cur);
}
g_slist_foreach(plugin_types, free_plugin_type, NULL);
g_slist_free(plugin_types);
}
#endif /* HAVE_PLUGINS */
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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