summaryrefslogtreecommitdiff
path: root/bus/main.c
blob: 8c605be36f1c5f525280bc160b08d44b5eb34c4b (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
308
309
310
311
312
313
314
315
316
317
318
/* -*- mode: C; c-file-style: "gnu" -*- */
/* main.c  main() for message bus
 *
 * Copyright (C) 2003 Red Hat, Inc.
 *
 * Licensed under the Academic Free License version 1.2
 * 
 * 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
 *
 */
#include "bus.h"
#include <dbus/dbus-internals.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <errno.h>

static BusContext *context;
static dbus_bool_t got_sighup = FALSE;

static void
signal_handler (int sig)
{
  switch (sig)
    {
    case SIGHUP:
      got_sighup = TRUE;
    case SIGTERM:
      _dbus_loop_quit (bus_context_get_loop (context));
      break;
    }
}

static void
usage (void)
{
  fprintf (stderr, "dbus-daemon-1 [--version] [--session] [--system] [--config-file=FILE] [--print-address[=DESCRIPTOR]] [--print-pid[=DESCRIPTOR]] [--fork]\n");
  exit (1);
}

static void
version (void)
{
  printf ("D-BUS Message Bus Daemon %s\n"
          "Copyright (C) 2002, 2003 Red Hat, Inc., CodeFactory AB, and others\n"
          "This is free software; see the source for copying conditions.\n"
          "There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
          VERSION);
  exit (0);
}

static void
check_two_config_files (const DBusString *config_file,
                        const char       *extra_arg)
{
  if (_dbus_string_get_length (config_file) > 0)
    {
      fprintf (stderr, "--%s specified but configuration file %s already requested\n",
               extra_arg, _dbus_string_get_const_data (config_file));
      exit (1);
    }
}

static void
check_two_addr_descriptors (const DBusString *addr_fd,
                            const char       *extra_arg)
{
  if (_dbus_string_get_length (addr_fd) > 0)
    {
      fprintf (stderr, "--%s specified but printing address to %s already requested\n",
               extra_arg, _dbus_string_get_const_data (addr_fd));
      exit (1);
    }
}

static void
check_two_pid_descriptors (const DBusString *pid_fd,
                           const char       *extra_arg)
{
  if (_dbus_string_get_length (pid_fd) > 0)
    {
      fprintf (stderr, "--%s specified but printing pid to %s already requested\n",
               extra_arg, _dbus_string_get_const_data (pid_fd));
      exit (1);
    }
}

int
main (int argc, char **argv)
{
  DBusError error;
  DBusString config_file;
  DBusString addr_fd;
  DBusString pid_fd;
  const char *prev_arg;
  int print_addr_fd;
  int print_pid_fd;
  int i;
  dbus_bool_t print_address;
  dbus_bool_t print_pid;
  dbus_bool_t force_fork;
  
  if (!_dbus_string_init (&config_file))
    return 1;

  if (!_dbus_string_init (&addr_fd))
    return 1;

  if (!_dbus_string_init (&pid_fd))
    return 1;
  
  print_address = FALSE;
  print_pid = FALSE;
  force_fork = FALSE;
  
  prev_arg = NULL;
  i = 1;
  while (i < argc)
    {
      const char *arg = argv[i];
      
      if (strcmp (arg, "--help") == 0 ||
          strcmp (arg, "-h") == 0 ||
          strcmp (arg, "-?") == 0)
        usage ();
      else if (strcmp (arg, "--version") == 0)
        version ();
      else if (strcmp (arg, "--fork") == 0)
        force_fork = TRUE;
      else if (strcmp (arg, "--system") == 0)
        {
          check_two_config_files (&config_file, "system");

          if (!_dbus_string_append (&config_file, DBUS_SYSTEM_CONFIG_FILE))
            exit (1);
        }
      else if (strcmp (arg, "--session") == 0)
        {
          check_two_config_files (&config_file, "session");

          if (!_dbus_string_append (&config_file, DBUS_SESSION_CONFIG_FILE))
            exit (1);
        }
      else if (strstr (arg, "--config-file=") == arg)
        {
          const char *file;

          check_two_config_files (&config_file, "config-file");
          
          file = strchr (arg, '=');
          ++file;

          if (!_dbus_string_append (&config_file, file))
            exit (1);
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--config-file") == 0)
        {
          check_two_config_files (&config_file, "config-file");
          
          if (!_dbus_string_append (&config_file, arg))
            exit (1);
        }
      else if (strcmp (arg, "--config-file") == 0)
        ; /* wait for next arg */
      else if (strstr (arg, "--print-address=") == arg)
        {
          const char *desc;

          check_two_addr_descriptors (&addr_fd, "print-address");
          
          desc = strchr (arg, '=');
          ++desc;

          if (!_dbus_string_append (&addr_fd, desc))
            exit (1);

          print_address = TRUE;
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--print-address") == 0)
        {
          check_two_addr_descriptors (&addr_fd, "print-address");
          
          if (!_dbus_string_append (&addr_fd, arg))
            exit (1);

          print_address = TRUE;
        }
      else if (strcmp (arg, "--print-address") == 0)
        print_address = TRUE; /* and we'll get the next arg if appropriate */
      else if (strstr (arg, "--print-pid=") == arg)
        {
          const char *desc;

          check_two_pid_descriptors (&pid_fd, "print-pid");
          
          desc = strchr (arg, '=');
          ++desc;

          if (!_dbus_string_append (&pid_fd, desc))
            exit (1);

          print_pid = TRUE;
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--print-pid") == 0)
        {
          check_two_pid_descriptors (&pid_fd, "print-pid");
          
          if (!_dbus_string_append (&pid_fd, arg))
            exit (1);
          
          print_pid = TRUE;
        }
      else if (strcmp (arg, "--print-pid") == 0)
        print_pid = TRUE; /* and we'll get the next arg if appropriate */
      else
        usage ();
      
      prev_arg = arg;
      
      ++i;
    }

  if (_dbus_string_get_length (&config_file) == 0)
    {
      fprintf (stderr, "No configuration file specified.\n");
      usage ();
    }

  print_addr_fd = -1;
  if (print_address)
    {
      print_addr_fd = 1; /* stdout */
      if (_dbus_string_get_length (&addr_fd) > 0)
        {
          long val;
          int end;
          if (!_dbus_string_parse_int (&addr_fd, 0, &val, &end) ||
              end != _dbus_string_get_length (&addr_fd) ||
              val < 0 || val > _DBUS_INT_MAX)
            {
              fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
                       _dbus_string_get_const_data (&addr_fd));
              exit (1);
            }

          print_addr_fd = val;
        }
    }

  print_pid_fd = -1;
  if (print_pid)
    {
      print_pid_fd = 1; /* stdout */
      if (_dbus_string_get_length (&pid_fd) > 0)
        {
          long val;
          int end;
          if (!_dbus_string_parse_int (&pid_fd, 0, &val, &end) ||
              end != _dbus_string_get_length (&pid_fd) ||
              val < 0 || val > _DBUS_INT_MAX)
            {
              fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
                       _dbus_string_get_const_data (&pid_fd));
              exit (1);
            }

          print_pid_fd = val;
        }
    }
  
  dbus_error_init (&error);
  context = bus_context_new (&config_file, force_fork,
                             print_addr_fd, print_pid_fd,
                             &error);
  _dbus_string_free (&config_file);
  if (context == NULL)
    {
      _dbus_warn ("Failed to start message bus: %s\n",
                  error.message);
      dbus_error_free (&error);
      exit (1);
    }
  
  /* FIXME we have to handle this properly below _dbus_set_signal_handler (SIGHUP, signal_handler); */
  _dbus_set_signal_handler (SIGTERM, signal_handler);
  
  _dbus_verbose ("We are on D-Bus...\n");
  _dbus_loop_run (bus_context_get_loop (context));
  
  bus_context_shutdown (context);
  bus_context_unref (context);

  /* If we exited on TERM we just exit, if we exited on
   * HUP we restart the daemon.
   */
  if (got_sighup)
    {
      /* FIXME execv (argv) basically */
    }
  
  return 0;
}