summaryrefslogtreecommitdiffstats
path: root/src/hotplug-sniffer/hotplug-sniffer.c
blob: af3a4c2fc245874062c0f8f62159be1f43e2ec7a (plain)
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
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
 * Copyright (C) 2011 Red Hat, Inc.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Authors: David Zeuthen <davidz@redhat.com>
 *          Cosimo Cecchi <cosimoc@redhat.com>
 *
 */

#include "shell-mime-sniffer.h"
#include "hotplug-mimetypes.h"

/* Set the environment variable HOTPLUG_SNIFFER_DEBUG to show debug */
static void print_debug (const gchar *str, ...);

#define BUS_NAME "org.gnome.Shell.HotplugSniffer"
#define AUTOQUIT_TIMEOUT 5

static const gchar introspection_xml[] =
  "<node>"
  "  <interface name='org.gnome.Shell.HotplugSniffer'>"
  "    <method name='SniffURI'>"
  "      <arg type='s' name='uri' direction='in'/>"
  "      <arg type='as' name='content_types' direction='out'/>"
  "    </method>"
  "  </interface>"
  "</node>";

static GDBusNodeInfo *introspection_data = NULL;
static GMainLoop     *loop = NULL;
static guint          autoquit_id = 0;

static gboolean
autoquit_timeout_cb (gpointer _unused)
{
  print_debug ("Timeout reached, quitting...");

  autoquit_id = 0;
  g_main_loop_quit (loop);

  return FALSE;
}

static void
ensure_autoquit_off (void)
{
  if (g_getenv ("HOTPLUG_SNIFFER_PERSIST") != NULL)
    return;

  if (autoquit_id != 0)
    {
      g_source_remove (autoquit_id);
      autoquit_id = 0;
    }
}

static void
ensure_autoquit_on (void)
{
  if (g_getenv ("HOTPLUG_SNIFFER_PERSIST") != NULL)
    return;

  autoquit_id = 
    g_timeout_add_seconds (AUTOQUIT_TIMEOUT,
                           autoquit_timeout_cb, NULL);
}

typedef struct {
  GVariant *parameters;
  GDBusMethodInvocation *invocation;
} InvocationData;

static InvocationData *
invocation_data_new (GVariant *params,
                     GDBusMethodInvocation *invocation)
{
  InvocationData *ret;

  ret = g_slice_new0 (InvocationData);
  ret->parameters = g_variant_ref (params);
  ret->invocation = g_object_ref (invocation);

  return ret;
}

static void
invocation_data_free (InvocationData *data)
{
  g_variant_unref (data->parameters);
  g_clear_object (&data->invocation);

  g_slice_free (InvocationData, data);
}

static void
sniff_async_ready_cb (GObject *source,
                      GAsyncResult *res,
                      gpointer user_data)
{
  InvocationData *data = user_data;
  gchar **types;
  GError *error = NULL;

  types = shell_mime_sniffer_sniff_finish (SHELL_MIME_SNIFFER (source),
                                           res, &error);

  if (error != NULL)
    {
      g_dbus_method_invocation_return_gerror (data->invocation, error);
      g_error_free (error);
      goto out;
    }

  g_dbus_method_invocation_return_value (data->invocation,
                                         g_variant_new ("(^as)", types));
  g_strfreev (types);

 out:
  invocation_data_free (data);
  ensure_autoquit_on ();
}

static void
handle_sniff_uri (InvocationData *data)
{
  ShellMimeSniffer *sniffer;
  const gchar *uri;
  GFile *file;

  ensure_autoquit_off ();

  g_variant_get (data->parameters, 
                 "(&s)", &uri,
                 NULL);
  file = g_file_new_for_uri (uri);

  print_debug ("Initiating sniff for uri %s", uri);

  sniffer = shell_mime_sniffer_new (file);
  shell_mime_sniffer_sniff_async (sniffer,
                                  sniff_async_ready_cb,
                                  data);

  g_object_unref (sniffer);
  g_object_unref (file);
}

static void
handle_method_call (GDBusConnection       *connection,
                    const gchar           *sender,
                    const gchar           *object_path,
                    const gchar           *interface_name,
                    const gchar           *method_name,
                    GVariant              *parameters,
                    GDBusMethodInvocation *invocation,
                    gpointer               user_data)
{
  InvocationData *data;

  data = invocation_data_new (parameters, invocation);

  if (g_strcmp0 (method_name, "SniffURI") == 0)
    handle_sniff_uri (data);
  else
    g_assert_not_reached ();
}

static const GDBusInterfaceVTable interface_vtable =
{
  handle_method_call,
  NULL, /* get_property */
  NULL, /* set_property */
};

static void
on_bus_acquired (GDBusConnection *connection,
                 const gchar *name,
                 gpointer user_data)
{
  GError *error = NULL;

  print_debug ("Connected to the session bus: %s", name);

  g_dbus_connection_register_object (connection,
                                     "/org/gnome/Shell/HotplugSniffer",
                                     introspection_data->interfaces[0],
                                     &interface_vtable,
                                     NULL,
                                     NULL,
                                     &error);

  if (error != NULL)
    {
      g_printerr ("Error exporting object on the session bus: %s",
                  error->message);
      g_error_free (error);

      _exit(1);
    }

  print_debug ("Object exported on the session bus");
}

static void
on_name_lost (GDBusConnection *connection,
              const gchar *name,
              gpointer user_data)
{
  print_debug ("Lost bus name: %s, exiting", name);

  g_main_loop_quit (loop);
}

static void
on_name_acquired (GDBusConnection *connection,
                  const gchar *name,
                  gpointer user_data)
{
  print_debug ("Acquired bus name: %s", name);
}

int
main (int    argc,
      char **argv)
{
  guint name_owner_id;

  introspection_data = g_dbus_node_info_new_for_xml (introspection_xml, NULL);
  g_assert (introspection_data != NULL);

  ensure_autoquit_on ();
  loop = g_main_loop_new (NULL, FALSE);

  name_owner_id = g_bus_own_name (G_BUS_TYPE_SESSION,
                                  BUS_NAME, 0,
                                  on_bus_acquired,
                                  on_name_acquired,
                                  on_name_lost,
                                  NULL,
                                  NULL);

  g_main_loop_run (loop);

  if (name_owner_id != 0)
    g_bus_unown_name (name_owner_id);

  if (loop != NULL)
    g_main_loop_unref (loop);

  return 0;
}

/* ---------------------------------------------------------------------------------------------------- */

static void
print_debug (const gchar *format, ...)
{
  gchar *s;
  va_list ap;
  gchar timebuf[64];
  GTimeVal now;
  time_t now_t;
  struct tm broken_down;
  static volatile gsize once_init_value = 0;
  static gboolean show_debug = FALSE;
  static guint pid = 0;

  if (g_once_init_enter (&once_init_value))
    {
      show_debug = (g_getenv ("HOTPLUG_SNIFFER_DEBUG") != NULL);
      pid = getpid ();
      g_once_init_leave (&once_init_value, 1);
    }

  if (!show_debug)
    goto out;

  g_get_current_time (&now);
  now_t = now.tv_sec;
  localtime_r (&now_t, &broken_down);
  strftime (timebuf, sizeof timebuf, "%H:%M:%S", &broken_down);

  va_start (ap, format);
  s = g_strdup_vprintf (format, ap);
  va_end (ap);

  g_print ("gnome-shell-hotplug-sniffer[%d]: %s.%03d: %s\n", pid, timebuf, (gint) (now.tv_usec / 1000), s);
  g_free (s);
 out:
  ;
}