File: nm-vpn-plugin-utils.c

package info (click to toggle)
network-manager-fortisslvpn 1.2.8-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid
  • size: 2,564 kB
  • sloc: ansic: 5,340; sh: 4,177; makefile: 271; xml: 19
file content (130 lines) | stat: -rw-r--r-- 4,681 bytes parent folder | download | duplicates (15)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 * Copyright 2016 Red Hat, Inc.
 */

#include "nm-default.h"

#include "nm-vpn-plugin-utils.h"

#include <dlfcn.h>

/*****************************************************************************/

NMVpnEditor *
nm_vpn_plugin_utils_load_editor (const char *module_name,
                                 const char *factory_name,
                                 NMVpnPluginUtilsEditorFactory editor_factory,
                                 NMVpnEditorPlugin *editor_plugin,
                                 NMConnection *connection,
                                 gpointer user_data,
                                 GError **error)

{
	static struct {
		gpointer factory;
		void *dl_module;
		char *module_name;
		char *factory_name;
	} cached = { 0 };
	NMVpnEditor *editor;

	g_return_val_if_fail (module_name && g_path_is_absolute (module_name), NULL);
	g_return_val_if_fail (factory_name && factory_name[0], NULL);
	g_return_val_if_fail (editor_factory, NULL);
	g_return_val_if_fail (NM_IS_VPN_EDITOR_PLUGIN (editor_plugin), NULL);
	g_return_val_if_fail (NM_IS_CONNECTION (connection), NULL);
	g_return_val_if_fail (!error || !*error, NULL);

	/* we really expect this function to be called with unchanging @module_name
	 * and @factory_name. And we only want to load the module once, hence it would
	 * be more complicated to accept changing @module_name/@factory_name arguments.
	 *
	 * The reason for only loading once is that due to glib types, we cannot create a
	 * certain type-name more then once, so loading the same module or another version
	 * of the same module will fail horribly as both try to create a GType with the same
	 * name.
	 *
	 * Only support loading once, any future calls will reuse the handle. To simplify
	 * that, we enforce that the @factory_name and @module_name is the same. */
	if (cached.factory) {
		g_return_val_if_fail (cached.dl_module, NULL);
		g_return_val_if_fail (cached.factory_name && nm_streq0 (cached.factory_name, factory_name), NULL);
		g_return_val_if_fail (cached.module_name && nm_streq0 (cached.module_name, module_name), NULL);
	} else {
		gpointer factory;
		void *dl_module;

		dl_module = dlopen (module_name, RTLD_LAZY | RTLD_LOCAL);
		if (!dl_module) {
			if (!g_file_test (module_name, G_FILE_TEST_EXISTS)) {
				g_set_error (error,
				             G_FILE_ERROR,
				             G_FILE_ERROR_NOENT,
				             _("missing plugin file \"%s\""), module_name);
				return NULL;
			}
			g_set_error (error,
			             NM_CONNECTION_ERROR,
			             NM_CONNECTION_ERROR_FAILED,
			             _("cannot load editor plugin: %s"), dlerror ());
			return NULL;
		}

		factory = dlsym (dl_module, factory_name);
		if (!factory) {
			g_set_error (error,
			             NM_CONNECTION_ERROR,
			             NM_CONNECTION_ERROR_FAILED,
			             _("cannot load factory %s from plugin: %s"),
			             factory_name, dlerror ());
			dlclose (dl_module);
			return NULL;
		}

		/* we cannot ever unload the module because it creates glib types, which
		 * cannot be unregistered.
		 *
		 * Thus we just leak the dl_module handle indefinitely. */
		cached.factory = factory;
		cached.dl_module = dl_module;
		cached.module_name = g_strdup (module_name);
		cached.factory_name = g_strdup (factory_name);
	}

	editor = editor_factory (cached.factory,
	                         editor_plugin,
	                         connection,
	                         user_data,
	                         error);
	if (!editor) {
		if (error && !*error ) {
			g_set_error_literal (error,
			                     NM_CONNECTION_ERROR,
			                     NM_CONNECTION_ERROR_FAILED,
			                     _("unknown error creating editor instance"));
			g_return_val_if_reached (NULL);
		}
		return NULL;
	}

	g_return_val_if_fail (NM_IS_VPN_EDITOR (editor), NULL);
	return editor;
}