D-Bus  1.14.99
dbus-sysdeps-util-unix.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-sysdeps-util-unix.c Would be in dbus-sysdeps-unix.c, but not used in libdbus
3  *
4  * Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
5  * Copyright (C) 2003 CodeFactory AB
6  *
7  * Licensed under the Academic Free License version 2.1
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  *
23  */
24 
25 #include <config.h>
26 #include "dbus-sysdeps.h"
27 #include "dbus-sysdeps-unix.h"
28 #include "dbus-internals.h"
29 #include "dbus-list.h"
30 #include "dbus-pipe.h"
31 #include "dbus-protocol.h"
32 #include "dbus-string.h"
33 #define DBUS_USERDB_INCLUDES_PRIVATE 1
34 #include "dbus-userdb.h"
35 #include "dbus-test.h"
36 
37 #include <sys/types.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <signal.h>
42 #include <unistd.h>
43 #include <stdio.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <sys/stat.h>
47 #ifdef HAVE_SYS_RESOURCE_H
48 #include <sys/resource.h>
49 #endif
50 #include <grp.h>
51 #include <sys/socket.h>
52 #include <dirent.h>
53 #include <sys/un.h>
54 
55 #ifdef HAVE_SYS_PRCTL_H
56 #include <sys/prctl.h>
57 #endif
58 
59 #ifdef HAVE_SYS_SYSLIMITS_H
60 #include <sys/syslimits.h>
61 #endif
62 
63 #ifdef HAVE_SYSTEMD
64 #include <systemd/sd-daemon.h>
65 #endif
66 
67 #ifndef O_BINARY
68 #define O_BINARY 0
69 #endif
70 
88  DBusPipe *print_pid_pipe,
89  DBusError *error,
90  dbus_bool_t keep_umask)
91 {
92  const char *s;
93  pid_t child_pid;
94  DBusEnsureStandardFdsFlags flags;
95 
96  _dbus_verbose ("Becoming a daemon...\n");
97 
98  _dbus_verbose ("chdir to /\n");
99  if (chdir ("/") < 0)
100  {
102  "Could not chdir() to root directory");
103  return FALSE;
104  }
105 
106  _dbus_verbose ("forking...\n");
107 
108  /* Make sure our output buffers aren't redundantly printed by both the
109  * parent and the child */
110  fflush (stdout);
111  fflush (stderr);
112 
113  switch ((child_pid = fork ()))
114  {
115  case -1:
116  _dbus_verbose ("fork failed\n");
117  dbus_set_error (error, _dbus_error_from_errno (errno),
118  "Failed to fork daemon: %s", _dbus_strerror (errno));
119  return FALSE;
120  break;
121 
122  case 0:
123  _dbus_verbose ("in child, closing std file descriptors\n");
124 
125  flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
126  s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
127 
128  if (s == NULL || *s == '\0')
129  flags |= DBUS_FORCE_STDERR_NULL;
130  else
131  _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
132 
133  if (!_dbus_ensure_standard_fds (flags, &s))
134  {
135  _dbus_warn ("%s: %s", s, _dbus_strerror (errno));
136  _exit (1);
137  }
138 
139  if (!keep_umask)
140  {
141  /* Get a predictable umask */
142  _dbus_verbose ("setting umask\n");
143  umask (022);
144  }
145 
146  _dbus_verbose ("calling setsid()\n");
147  if (setsid () == -1)
148  _dbus_assert_not_reached ("setsid() failed");
149 
150  break;
151 
152  default:
153  if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
154  child_pid, error))
155  {
156  _dbus_verbose ("pid file or pipe write failed: %s\n",
157  error->message);
158  kill (child_pid, SIGTERM);
159  return FALSE;
160  }
161 
162  _dbus_verbose ("parent exiting\n");
163  _exit (0);
164  break;
165  }
166 
167  return TRUE;
168 }
169 
170 
179 static dbus_bool_t
180 _dbus_write_pid_file (const DBusString *filename,
181  unsigned long pid,
182  DBusError *error)
183 {
184  const char *cfilename;
185  int fd;
186  FILE *f;
187 
188  cfilename = _dbus_string_get_const_data (filename);
189 
190  fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
191 
192  if (fd < 0)
193  {
194  dbus_set_error (error, _dbus_error_from_errno (errno),
195  "Failed to open \"%s\": %s", cfilename,
196  _dbus_strerror (errno));
197  return FALSE;
198  }
199 
200  if ((f = fdopen (fd, "w")) == NULL)
201  {
202  dbus_set_error (error, _dbus_error_from_errno (errno),
203  "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
204  _dbus_close (fd, NULL);
205  return FALSE;
206  }
207 
208  if (fprintf (f, "%lu\n", pid) < 0)
209  {
210  dbus_set_error (error, _dbus_error_from_errno (errno),
211  "Failed to write to \"%s\": %s", cfilename,
212  _dbus_strerror (errno));
213 
214  fclose (f);
215  return FALSE;
216  }
217 
218  if (fclose (f) == EOF)
219  {
220  dbus_set_error (error, _dbus_error_from_errno (errno),
221  "Failed to close \"%s\": %s", cfilename,
222  _dbus_strerror (errno));
223  return FALSE;
224  }
225 
226  return TRUE;
227 }
228 
242  DBusPipe *print_pid_pipe,
243  dbus_pid_t pid_to_write,
244  DBusError *error)
245 {
246  if (pidfile)
247  {
248  _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
249  if (!_dbus_write_pid_file (pidfile,
250  pid_to_write,
251  error))
252  {
253  _dbus_verbose ("pid file write failed\n");
254  _DBUS_ASSERT_ERROR_IS_SET(error);
255  return FALSE;
256  }
257  }
258  else
259  {
260  _dbus_verbose ("No pid file requested\n");
261  }
262 
263  if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
264  {
265  DBusString pid;
266  int bytes;
267 
268  _dbus_verbose ("writing our pid to pipe %d\n",
269  print_pid_pipe->fd);
270 
271  if (!_dbus_string_init (&pid))
272  {
273  _DBUS_SET_OOM (error);
274  return FALSE;
275  }
276 
277  if (!_dbus_string_append_int (&pid, pid_to_write) ||
278  !_dbus_string_append (&pid, "\n"))
279  {
280  _dbus_string_free (&pid);
281  _DBUS_SET_OOM (error);
282  return FALSE;
283  }
284 
285  bytes = _dbus_string_get_length (&pid);
286  if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
287  {
288  /* _dbus_pipe_write sets error only on failure, not short write */
289  if (error != NULL && !dbus_error_is_set(error))
290  {
292  "Printing message bus PID: did not write enough bytes\n");
293  }
294  _dbus_string_free (&pid);
295  return FALSE;
296  }
297 
298  _dbus_string_free (&pid);
299  }
300  else
301  {
302  _dbus_verbose ("No pid pipe to write to\n");
303  }
304 
305  return TRUE;
306 }
307 
315 _dbus_verify_daemon_user (const char *user)
316 {
317  DBusString u;
318 
319  _dbus_string_init_const (&u, user);
320 
322 }
323 
324 
325 /* The HAVE_LIBAUDIT case lives in selinux.c */
326 #ifndef HAVE_LIBAUDIT
335 _dbus_change_to_daemon_user (const char *user,
336  DBusError *error)
337 {
338  dbus_uid_t uid;
339  dbus_gid_t gid;
340  DBusString u;
341 
342  _dbus_string_init_const (&u, user);
343 
344  if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
345  {
347  "User '%s' does not appear to exist?",
348  user);
349  return FALSE;
350  }
351 
352  /* setgroups() only works if we are a privileged process,
353  * so we don't return error on failure; the only possible
354  * failure is that we don't have perms to do it.
355  *
356  * not sure this is right, maybe if setuid()
357  * is going to work then setgroups() should also work.
358  */
359  if (setgroups (0, NULL) < 0)
360  _dbus_warn ("Failed to drop supplementary groups: %s",
361  _dbus_strerror (errno));
362 
363  /* Set GID first, or the setuid may remove our permission
364  * to change the GID
365  */
366  if (setgid (gid) < 0)
367  {
368  dbus_set_error (error, _dbus_error_from_errno (errno),
369  "Failed to set GID to %lu: %s", gid,
370  _dbus_strerror (errno));
371  return FALSE;
372  }
373 
374  if (setuid (uid) < 0)
375  {
376  dbus_set_error (error, _dbus_error_from_errno (errno),
377  "Failed to set UID to %lu: %s", uid,
378  _dbus_strerror (errno));
379  return FALSE;
380  }
381 
382  return TRUE;
383 }
384 #endif /* !HAVE_LIBAUDIT */
385 
386 #ifdef HAVE_SETRLIMIT
387 
388 /* We assume that if we have setrlimit, we also have getrlimit and
389  * struct rlimit.
390  */
391 
392 struct DBusRLimit {
393  struct rlimit lim;
394 };
395 
396 DBusRLimit *
397 _dbus_rlimit_save_fd_limit (DBusError *error)
398 {
399  DBusRLimit *self;
400 
401  self = dbus_new0 (DBusRLimit, 1);
402 
403  if (self == NULL)
404  {
405  _DBUS_SET_OOM (error);
406  return NULL;
407  }
408 
409  if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
410  {
411  dbus_set_error (error, _dbus_error_from_errno (errno),
412  "Failed to get fd limit: %s", _dbus_strerror (errno));
413  dbus_free (self);
414  return NULL;
415  }
416 
417  return self;
418 }
419 
420 /* Enough fds that we shouldn't run out, even if several uids work
421  * together to carry out a denial-of-service attack. This happens to be
422  * the same number that systemd < 234 would normally use. */
423 #define ENOUGH_FDS 65536
424 
426 _dbus_rlimit_raise_fd_limit (DBusError *error)
427 {
428  struct rlimit old, lim;
429 
430  if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
431  {
432  dbus_set_error (error, _dbus_error_from_errno (errno),
433  "Failed to get fd limit: %s", _dbus_strerror (errno));
434  return FALSE;
435  }
436 
437  old = lim;
438 
439  if (getuid () == 0)
440  {
441  /* We are privileged, so raise the soft limit to at least
442  * ENOUGH_FDS, and the hard limit to at least the desired soft
443  * limit. This assumes we can exercise CAP_SYS_RESOURCE on Linux,
444  * or other OSs' equivalents. */
445  if (lim.rlim_cur != RLIM_INFINITY &&
446  lim.rlim_cur < ENOUGH_FDS)
447  lim.rlim_cur = ENOUGH_FDS;
448 
449  if (lim.rlim_max != RLIM_INFINITY &&
450  lim.rlim_max < lim.rlim_cur)
451  lim.rlim_max = lim.rlim_cur;
452  }
453 
454  /* Raise the soft limit to match the hard limit, which we can do even
455  * if we are unprivileged. In particular, systemd >= 240 will normally
456  * set rlim_cur to 1024 and rlim_max to 512*1024, recent Debian
457  * versions end up setting rlim_cur to 1024 and rlim_max to 1024*1024,
458  * and older and non-systemd Linux systems would typically set rlim_cur
459  * to 1024 and rlim_max to 4096. */
460  if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
461  {
462 #if defined(__APPLE__) && defined(__MACH__)
463  /* macOS 10.5 and above no longer allows RLIM_INFINITY for rlim_cur */
464  lim.rlim_cur = MIN (OPEN_MAX, lim.rlim_max);
465 #else
466  lim.rlim_cur = lim.rlim_max;
467 #endif
468  }
469 
470  /* Early-return if there is nothing to do. */
471  if (lim.rlim_max == old.rlim_max &&
472  lim.rlim_cur == old.rlim_cur)
473  return TRUE;
474 
475  if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
476  {
477  dbus_set_error (error, _dbus_error_from_errno (errno),
478  "Failed to set fd limit to %lu: %s",
479  (unsigned long) lim.rlim_cur,
480  _dbus_strerror (errno));
481  return FALSE;
482  }
483 
484  return TRUE;
485 }
486 
488 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
489  DBusError *error)
490 {
491  if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
492  {
493  dbus_set_error (error, _dbus_error_from_errno (errno),
494  "Failed to restore old fd limit: %s",
495  _dbus_strerror (errno));
496  return FALSE;
497  }
498 
499  return TRUE;
500 }
501 
502 #else /* !HAVE_SETRLIMIT */
503 
504 static void
505 fd_limit_not_supported (DBusError *error)
506 {
508  "cannot change fd limit on this platform");
509 }
510 
511 DBusRLimit *
512 _dbus_rlimit_save_fd_limit (DBusError *error)
513 {
514  fd_limit_not_supported (error);
515  return NULL;
516 }
517 
519 _dbus_rlimit_raise_fd_limit (DBusError *error)
520 {
521  fd_limit_not_supported (error);
522  return FALSE;
523 }
524 
526 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
527  DBusError *error)
528 {
529  fd_limit_not_supported (error);
530  return FALSE;
531 }
532 
533 #endif
534 
535 void
536 _dbus_rlimit_free (DBusRLimit *lim)
537 {
538  dbus_free (lim);
539 }
540 
546 void
548  DBusSignalHandler handler)
549 {
550  struct sigaction act;
551  sigset_t empty_mask;
552 
553  sigemptyset (&empty_mask);
554  act.sa_handler = handler;
555  act.sa_mask = empty_mask;
556  act.sa_flags = 0;
557  sigaction (sig, &act, NULL);
558 }
559 
566 _dbus_file_exists (const char *file)
567 {
568  return (access (file, F_OK) == 0);
569 }
570 
579 {
580  if (_dbus_string_get_length (filename) > 0)
581  return _dbus_string_get_byte (filename, 0) == '/';
582  else
583  return FALSE;
584 }
585 
595 _dbus_stat (const DBusString *filename,
596  DBusStat *statbuf,
597  DBusError *error)
598 {
599  const char *filename_c;
600  struct stat sb;
601 
602  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
603 
604  filename_c = _dbus_string_get_const_data (filename);
605 
606  if (stat (filename_c, &sb) < 0)
607  {
608  dbus_set_error (error, _dbus_error_from_errno (errno),
609  "%s", _dbus_strerror (errno));
610  return FALSE;
611  }
612 
613  statbuf->mode = sb.st_mode;
614  statbuf->nlink = sb.st_nlink;
615  statbuf->uid = sb.st_uid;
616  statbuf->gid = sb.st_gid;
617  statbuf->size = sb.st_size;
618  statbuf->atime = sb.st_atime;
619  statbuf->mtime = sb.st_mtime;
620  statbuf->ctime = sb.st_ctime;
621 
622  return TRUE;
623 }
624 
625 
630 {
631  DIR *d;
633 };
634 
644  DBusError *error)
645 {
646  DIR *d;
647  DBusDirIter *iter;
648  const char *filename_c;
649 
650  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
651 
652  filename_c = _dbus_string_get_const_data (filename);
653 
654  d = opendir (filename_c);
655  if (d == NULL)
656  {
657  dbus_set_error (error, _dbus_error_from_errno (errno),
658  "Failed to read directory \"%s\": %s",
659  filename_c,
660  _dbus_strerror (errno));
661  return NULL;
662  }
663  iter = dbus_new0 (DBusDirIter, 1);
664  if (iter == NULL)
665  {
666  closedir (d);
668  "Could not allocate memory for directory iterator");
669  return NULL;
670  }
671 
672  iter->d = d;
673 
674  return iter;
675 }
676 
692  DBusString *filename,
693  DBusError *error)
694 {
695  struct dirent *ent;
696  int err;
697 
698  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
699 
700  again:
701  errno = 0;
702  ent = readdir (iter->d);
703 
704  if (!ent)
705  {
706  err = errno;
707 
708  if (err != 0)
709  dbus_set_error (error,
711  "%s", _dbus_strerror (err));
712 
713  return FALSE;
714  }
715  else if (ent->d_name[0] == '.' &&
716  (ent->d_name[1] == '\0' ||
717  (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
718  goto again;
719  else
720  {
721  _dbus_string_set_length (filename, 0);
722  if (!_dbus_string_append (filename, ent->d_name))
723  {
725  "No memory to read directory entry");
726  return FALSE;
727  }
728  else
729  {
730  return TRUE;
731  }
732  }
733 }
734 
738 void
740 {
741  closedir (iter->d);
742  dbus_free (iter);
743 }
744 
745 static dbus_bool_t
746 fill_user_info_from_group (struct group *g,
747  DBusGroupInfo *info,
748  DBusError *error)
749 {
750  _dbus_assert (g->gr_name != NULL);
751 
752  info->gid = g->gr_gid;
753  info->groupname = _dbus_strdup (g->gr_name);
754 
755  /* info->members = dbus_strdupv (g->gr_mem) */
756 
757  if (info->groupname == NULL)
758  {
760  return FALSE;
761  }
762 
763  return TRUE;
764 }
765 
766 static dbus_bool_t
767 fill_group_info (DBusGroupInfo *info,
768  dbus_gid_t gid,
769  const DBusString *groupname,
770  DBusError *error)
771 {
772  const char *group_c_str;
773 
774  _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
775  _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
776 
777  if (groupname)
778  group_c_str = _dbus_string_get_const_data (groupname);
779  else
780  group_c_str = NULL;
781 
782  /* For now assuming that the getgrnam() and getgrgid() flavors
783  * always correspond to the pwnam flavors, if not we have
784  * to add more configure checks.
785  */
786 
787 #ifdef HAVE_GETPWNAM_R
788  {
789  struct group *g;
790  int result;
791  size_t buflen;
792  char *buf;
793  struct group g_str;
794  dbus_bool_t b;
795 
796  /* retrieve maximum needed size for buf */
797  buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
798 
799  /* sysconf actually returns a long, but everything else expects size_t,
800  * so just recast here.
801  * https://bugs.freedesktop.org/show_bug.cgi?id=17061
802  */
803  if ((long) buflen <= 0)
804  buflen = 1024;
805 
806  result = -1;
807  while (1)
808  {
809  buf = dbus_malloc (buflen);
810  if (buf == NULL)
811  {
813  return FALSE;
814  }
815 
816  g = NULL;
817  if (group_c_str)
818  result = getgrnam_r (group_c_str, &g_str, buf, buflen,
819  &g);
820  else
821  result = getgrgid_r (gid, &g_str, buf, buflen,
822  &g);
823  /* Try a bigger buffer if ERANGE was returned:
824  https://bugs.freedesktop.org/show_bug.cgi?id=16727
825  */
826  if (result == ERANGE && buflen < 512 * 1024)
827  {
828  dbus_free (buf);
829  buflen *= 2;
830  }
831  else
832  {
833  break;
834  }
835  }
836 
837  if (result == 0 && g == &g_str)
838  {
839  b = fill_user_info_from_group (g, info, error);
840  dbus_free (buf);
841  return b;
842  }
843  else
844  {
845  dbus_set_error (error, _dbus_error_from_errno (errno),
846  "Group %s unknown or failed to look it up\n",
847  group_c_str ? group_c_str : "???");
848  dbus_free (buf);
849  return FALSE;
850  }
851  }
852 #else /* ! HAVE_GETPWNAM_R */
853  {
854  /* I guess we're screwed on thread safety here */
855  struct group *g;
856 
857 #warning getpwnam_r() not available, please report this to the dbus maintainers with details of your OS
858 
859  g = getgrnam (group_c_str);
860 
861  if (g != NULL)
862  {
863  return fill_user_info_from_group (g, info, error);
864  }
865  else
866  {
867  dbus_set_error (error, _dbus_error_from_errno (errno),
868  "Group %s unknown or failed to look it up\n",
869  group_c_str ? group_c_str : "???");
870  return FALSE;
871  }
872  }
873 #endif /* ! HAVE_GETPWNAM_R */
874 }
875 
887  const DBusString *groupname,
888  DBusError *error)
889 {
890  return fill_group_info (info, DBUS_GID_UNSET,
891  groupname, error);
892 
893 }
894 
906  dbus_gid_t gid,
907  DBusError *error)
908 {
909  return fill_group_info (info, gid, NULL, error);
910 }
911 
922  dbus_uid_t *uid_p)
923 {
924  return _dbus_get_user_id (username, uid_p);
925 
926 }
927 
938  dbus_gid_t *gid_p)
939 {
940  return _dbus_get_group_id (groupname, gid_p);
941 }
942 
955  dbus_gid_t **group_ids,
956  int *n_group_ids)
957 {
958  return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
959 }
960 
972  DBusError *error)
973 {
974  return _dbus_is_console_user (uid, error);
975 
976 }
977 
987 {
988  return uid == _dbus_geteuid ();
989 }
990 
999 _dbus_windows_user_is_process_owner (const char *windows_sid)
1000 {
1001  return FALSE;
1002 }
1003  /* End of DBusInternalsUtils functions */
1005 
1019  DBusString *dirname)
1020 {
1021  int sep;
1022 
1023  _dbus_assert (filename != dirname);
1024  _dbus_assert (filename != NULL);
1025  _dbus_assert (dirname != NULL);
1026 
1027  /* Ignore any separators on the end */
1028  sep = _dbus_string_get_length (filename);
1029  if (sep == 0)
1030  return _dbus_string_append (dirname, "."); /* empty string passed in */
1031 
1032  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1033  --sep;
1034 
1035  _dbus_assert (sep >= 0);
1036 
1037  if (sep == 0)
1038  return _dbus_string_append (dirname, "/");
1039 
1040  /* Now find the previous separator */
1041  _dbus_string_find_byte_backward (filename, sep, '/', &sep);
1042  if (sep < 0)
1043  return _dbus_string_append (dirname, ".");
1044 
1045  /* skip multiple separators */
1046  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1047  --sep;
1048 
1049  _dbus_assert (sep >= 0);
1050 
1051  if (sep == 0 &&
1052  _dbus_string_get_byte (filename, 0) == '/')
1053  return _dbus_string_append (dirname, "/");
1054  else
1055  return _dbus_string_copy_len (filename, 0, sep - 0,
1056  dirname, _dbus_string_get_length (dirname));
1057 } /* DBusString stuff */
1059 
1060 static void
1061 string_squash_nonprintable (DBusString *str)
1062 {
1063  unsigned char *buf;
1064  int i, len;
1065 
1066  buf = _dbus_string_get_udata (str);
1067  len = _dbus_string_get_length (str);
1068 
1069  /* /proc/$pid/cmdline is a sequence of \0-terminated words, but we
1070  * want a sequence of space-separated words, with no extra trailing
1071  * space:
1072  * "/bin/sleep" "\0" "60" "\0"
1073  * -> "/bin/sleep" "\0" "60"
1074  * -> "/bin/sleep" " " "60"
1075  *
1076  * so chop off the trailing NUL before cleaning up unprintable
1077  * characters. */
1078  if (len > 0 && buf[len - 1] == '\0')
1079  {
1080  _dbus_string_shorten (str, 1);
1081  len--;
1082  }
1083 
1084  for (i = 0; i < len; i++)
1085  {
1086  unsigned char c = (unsigned char) buf[i];
1087  if (c == '\0')
1088  buf[i] = ' ';
1089  else if (c < 0x20 || c > 127)
1090  buf[i] = '?';
1091  }
1092 }
1093 
1108 dbus_bool_t
1109 _dbus_command_for_pid (unsigned long pid,
1110  DBusString *str,
1111  int max_len,
1112  DBusError *error)
1113 {
1114  /* This is all Linux-specific for now */
1115  DBusString path;
1116  DBusString cmdline;
1117  int fd;
1118 
1119  if (!_dbus_string_init (&path))
1120  {
1121  _DBUS_SET_OOM (error);
1122  return FALSE;
1123  }
1124 
1125  if (!_dbus_string_init (&cmdline))
1126  {
1127  _DBUS_SET_OOM (error);
1128  _dbus_string_free (&path);
1129  return FALSE;
1130  }
1131 
1132  if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
1133  goto oom;
1134 
1135  fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1136  if (fd < 0)
1137  {
1138  dbus_set_error (error,
1139  _dbus_error_from_errno (errno),
1140  "Failed to open \"%s\": %s",
1141  _dbus_string_get_const_data (&path),
1142  _dbus_strerror (errno));
1143  goto fail;
1144  }
1145 
1146  if (!_dbus_read (fd, &cmdline, max_len))
1147  {
1148  dbus_set_error (error,
1149  _dbus_error_from_errno (errno),
1150  "Failed to read from \"%s\": %s",
1151  _dbus_string_get_const_data (&path),
1152  _dbus_strerror (errno));
1153  _dbus_close (fd, NULL);
1154  goto fail;
1155  }
1156 
1157  if (!_dbus_close (fd, error))
1158  goto fail;
1159 
1160  string_squash_nonprintable (&cmdline);
1161 
1162  if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
1163  goto oom;
1164 
1165  _dbus_string_free (&cmdline);
1166  _dbus_string_free (&path);
1167  return TRUE;
1168 oom:
1169  _DBUS_SET_OOM (error);
1170 fail:
1171  _dbus_string_free (&cmdline);
1172  _dbus_string_free (&path);
1173  return FALSE;
1174 }
1175 
1186 {
1187  return TRUE;
1188 }
1189 
1190 static dbus_bool_t
1191 ensure_owned_directory (const char *label,
1192  const DBusString *string,
1193  dbus_bool_t create,
1194  DBusError *error)
1195 {
1196  const char *dir = _dbus_string_get_const_data (string);
1197  struct stat buf;
1198 
1199  if (create && !_dbus_ensure_directory (string, error))
1200  return FALSE;
1201 
1202  /*
1203  * The stat()-based checks in this function are to protect against
1204  * mistakes, not malice. We are working in a directory that is meant
1205  * to be trusted; but if a user has used `su` or similar to escalate
1206  * their privileges without correctly clearing the environment, the
1207  * XDG_RUNTIME_DIR in the environment might still be the user's
1208  * and not root's. We don't want to write root-owned files into that
1209  * directory, so just warn and don't provide support for transient
1210  * services in that case.
1211  *
1212  * In particular, we use stat() and not lstat() so that if we later
1213  * decide to use a different directory name for transient services,
1214  * we can drop in a compatibility symlink without breaking older
1215  * libdbus.
1216  */
1217 
1218  if (stat (dir, &buf) != 0)
1219  {
1220  int saved_errno = errno;
1221 
1222  dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1223  "%s \"%s\" not available: %s", label, dir,
1224  _dbus_strerror (saved_errno));
1225  return FALSE;
1226  }
1227 
1228  if (!S_ISDIR (buf.st_mode))
1229  {
1230  dbus_set_error (error, DBUS_ERROR_FAILED, "%s \"%s\" is not a directory",
1231  label, dir);
1232  return FALSE;
1233  }
1234 
1235  if (buf.st_uid != geteuid ())
1236  {
1238  "%s \"%s\" is owned by uid %ld, not our uid %ld",
1239  label, dir, (long) buf.st_uid, (long) geteuid ());
1240  return FALSE;
1241  }
1242 
1243  /* This is just because we have the stat() results already, so we might
1244  * as well check opportunistically. */
1245  if ((S_IWOTH | S_IWGRP) & buf.st_mode)
1246  {
1248  "%s \"%s\" can be written by others (mode 0%o)",
1249  label, dir, buf.st_mode);
1250  return FALSE;
1251  }
1252 
1253  return TRUE;
1254 }
1255 
1256 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"
1257 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"
1258 
1268  DBusError *error)
1269 {
1270  const char *xdg_runtime_dir;
1271  DBusString services;
1272  DBusString dbus1;
1273  DBusString xrd;
1274  dbus_bool_t ret = FALSE;
1275  char *data = NULL;
1276 
1277  if (!_dbus_string_init (&dbus1))
1278  {
1279  _DBUS_SET_OOM (error);
1280  return FALSE;
1281  }
1282 
1283  if (!_dbus_string_init (&services))
1284  {
1285  _dbus_string_free (&dbus1);
1286  _DBUS_SET_OOM (error);
1287  return FALSE;
1288  }
1289 
1290  if (!_dbus_string_init (&xrd))
1291  {
1292  _dbus_string_free (&dbus1);
1293  _dbus_string_free (&services);
1294  _DBUS_SET_OOM (error);
1295  return FALSE;
1296  }
1297 
1298  xdg_runtime_dir = _dbus_getenv ("XDG_RUNTIME_DIR");
1299 
1300  /* Not an error, we just can't have transient session services */
1301  if (xdg_runtime_dir == NULL)
1302  {
1303  _dbus_verbose ("XDG_RUNTIME_DIR is unset: transient session services "
1304  "not available here\n");
1305  ret = TRUE;
1306  goto out;
1307  }
1308 
1309  if (!_dbus_string_append (&xrd, xdg_runtime_dir) ||
1310  !_dbus_string_append_printf (&dbus1, "%s/dbus-1",
1311  xdg_runtime_dir) ||
1312  !_dbus_string_append_printf (&services, "%s/dbus-1/services",
1313  xdg_runtime_dir))
1314  {
1315  _DBUS_SET_OOM (error);
1316  goto out;
1317  }
1318 
1319  if (!ensure_owned_directory ("XDG_RUNTIME_DIR", &xrd, FALSE, error) ||
1320  !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &dbus1, TRUE,
1321  error) ||
1322  !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &services,
1323  TRUE, error))
1324  goto out;
1325 
1326  if (!_dbus_string_steal_data (&services, &data) ||
1327  !_dbus_list_append (dirs, data))
1328  {
1329  _DBUS_SET_OOM (error);
1330  goto out;
1331  }
1332 
1333  _dbus_verbose ("Transient service directory is %s\n", data);
1334  /* Ownership was transferred to @dirs */
1335  data = NULL;
1336  ret = TRUE;
1337 
1338 out:
1339  _dbus_string_free (&dbus1);
1340  _dbus_string_free (&services);
1341  _dbus_string_free (&xrd);
1342  dbus_free (data);
1343  return ret;
1344 }
1345 
1365 {
1366  const char *xdg_data_home;
1367  const char *xdg_data_dirs;
1368  DBusString servicedir_path;
1369 
1370  if (!_dbus_string_init (&servicedir_path))
1371  return FALSE;
1372 
1373  xdg_data_home = _dbus_getenv ("XDG_DATA_HOME");
1374  xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
1375 
1376  if (xdg_data_home != NULL)
1377  {
1378  if (!_dbus_string_append (&servicedir_path, xdg_data_home))
1379  goto oom;
1380  }
1381  else
1382  {
1383  const DBusString *homedir;
1384  DBusString local_share;
1385 
1386  if (!_dbus_homedir_from_current_process (&homedir))
1387  goto oom;
1388 
1389  if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir)))
1390  goto oom;
1391 
1392  _dbus_string_init_const (&local_share, "/.local/share");
1393  if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share))
1394  goto oom;
1395  }
1396 
1397  if (!_dbus_string_append (&servicedir_path, ":"))
1398  goto oom;
1399 
1400  if (xdg_data_dirs != NULL)
1401  {
1402  if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
1403  goto oom;
1404 
1405  if (!_dbus_string_append (&servicedir_path, ":"))
1406  goto oom;
1407  }
1408  else
1409  {
1410  if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
1411  goto oom;
1412  }
1413 
1414  /*
1415  * add configured datadir to defaults
1416  * this may be the same as an xdg dir
1417  * however the config parser should take
1418  * care of duplicates
1419  */
1420  if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR))
1421  goto oom;
1422 
1423  if (!_dbus_split_paths_and_append (&servicedir_path,
1424  DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
1425  dirs))
1426  goto oom;
1427 
1428  _dbus_string_free (&servicedir_path);
1429  return TRUE;
1430 
1431  oom:
1432  _dbus_string_free (&servicedir_path);
1433  return FALSE;
1434 }
1435 
1436 
1457 {
1458  /*
1459  * DBUS_DATADIR may be the same as one of the standard directories. However,
1460  * the config parser should take care of the duplicates.
1461  *
1462  * Also, append /lib as counterpart of /usr/share on the root
1463  * directory (the root directory does not know /share), in order to
1464  * facilitate early boot system bus activation where /usr might not
1465  * be available.
1466  */
1467  static const char standard_search_path[] =
1468  "/usr/local/share:"
1469  "/usr/share:"
1470  DBUS_DATADIR ":"
1471  "/lib";
1472  DBusString servicedir_path;
1473 
1474  _dbus_string_init_const (&servicedir_path, standard_search_path);
1475 
1476  return _dbus_split_paths_and_append (&servicedir_path,
1477  DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
1478  dirs);
1479 }
1480 
1491 {
1492  _dbus_assert (_dbus_string_get_length (str) == 0);
1493 
1494  return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
1495 }
1496 
1505 {
1506  _dbus_assert (_dbus_string_get_length (str) == 0);
1507 
1508  return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
1509 }
1510 
1515 void
1517 {
1518 #ifdef HAVE_SYSTEMD
1519  sd_notify (0, "READY=1");
1520 #endif
1521 }
1522 
1527 void
1529 {
1530 #ifdef HAVE_SYSTEMD
1531  sd_notify (0, "RELOADING=1");
1532 #endif
1533 }
1534 
1539 void
1541 {
1542 #ifdef HAVE_SYSTEMD
1543  /* For systemd, this is the same code */
1545 #endif
1546 }
1547 
1552 void
1554 {
1555 #ifdef HAVE_SYSTEMD
1556  sd_notify (0, "STOPPING=1");
1557 #endif
1558 }
1559 
1574 _dbus_reset_oom_score_adj (const char **error_str_p)
1575 {
1576 #ifdef __linux__
1577  int fd = -1;
1578  dbus_bool_t ret = FALSE;
1579  int saved_errno = 0;
1580  const char *error_str = NULL;
1581 
1582 #ifdef O_CLOEXEC
1583  fd = open ("/proc/self/oom_score_adj", O_RDONLY | O_CLOEXEC);
1584 #endif
1585 
1586  if (fd < 0)
1587  {
1588  fd = open ("/proc/self/oom_score_adj", O_RDONLY);
1589  if (fd >= 0)
1591  }
1592 
1593  if (fd >= 0)
1594  {
1595  ssize_t read_result = -1;
1596  /* It doesn't actually matter whether we read the whole file,
1597  * as long as we get the presence or absence of the minus sign */
1598  char first_char = '\0';
1599 
1600  read_result = read (fd, &first_char, 1);
1601 
1602  if (read_result < 0)
1603  {
1604  /* This probably can't actually happen in practice: if we can
1605  * open it, then we can hopefully read from it */
1606  ret = FALSE;
1607  error_str = "failed to read from /proc/self/oom_score_adj";
1608  saved_errno = errno;
1609  goto out;
1610  }
1611 
1612  /* If we are running with protection from the OOM killer
1613  * (typical for the system dbus-daemon under systemd), then
1614  * oom_score_adj will be negative. Drop that protection,
1615  * returning to oom_score_adj = 0.
1616  *
1617  * Conversely, if we are running with increased susceptibility
1618  * to the OOM killer (as user sessions typically do in
1619  * systemd >= 250), oom_score_adj will be strictly positive,
1620  * and we are not allowed to decrease it to 0 without privileges.
1621  *
1622  * If it's exactly 0 (typical for non-systemd systems, and
1623  * user processes on older systemd) then there's no need to
1624  * alter it.
1625  *
1626  * We shouldn't get an empty result, but if we do, assume it
1627  * means zero and don't try to change it. */
1628  if (read_result == 0 || first_char != '-')
1629  {
1630  /* Nothing needs to be done: the OOM score adjustment is
1631  * non-negative */
1632  ret = TRUE;
1633  goto out;
1634  }
1635 
1636  close (fd);
1637 #ifdef O_CLOEXEC
1638  fd = open ("/proc/self/oom_score_adj", O_WRONLY | O_CLOEXEC);
1639 
1640  if (fd < 0)
1641 #endif
1642  {
1643  fd = open ("/proc/self/oom_score_adj", O_WRONLY);
1644  if (fd >= 0)
1646  }
1647 
1648  if (fd < 0)
1649  {
1650  ret = FALSE;
1651  error_str = "open(/proc/self/oom_score_adj) for writing";
1652  saved_errno = errno;
1653  goto out;
1654  }
1655 
1656  if (pwrite (fd, "0", sizeof (char), 0) < 0)
1657  {
1658  ret = FALSE;
1659  error_str = "writing oom_score_adj error";
1660  saved_errno = errno;
1661  goto out;
1662  }
1663 
1664  /* Success */
1665  ret = TRUE;
1666  }
1667  else if (errno == ENOENT)
1668  {
1669  /* If /proc/self/oom_score_adj doesn't exist, assume the kernel
1670  * doesn't support this feature and ignore it. */
1671  ret = TRUE;
1672  }
1673  else
1674  {
1675  ret = FALSE;
1676  error_str = "open(/proc/self/oom_score_adj) for reading";
1677  saved_errno = errno;
1678  goto out;
1679  }
1680 
1681 out:
1682  if (fd >= 0)
1683  _dbus_close (fd, NULL);
1684 
1685  if (error_str_p != NULL)
1686  *error_str_p = error_str;
1687 
1688  errno = saved_errno;
1689  return ret;
1690 #else
1691  /* nothing to do on this platform */
1692  return TRUE;
1693 #endif
1694 }
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
Definition: dbus-errors.c:354
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition: dbus-errors.c:329
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
dbus_bool_t _dbus_write_pid_to_file_and_pipe(const DBusString *pidfile, DBusPipe *print_pid_pipe, dbus_pid_t pid_to_write, DBusError *error)
Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a pipe (if non-NULL).
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists.
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process.
Definition: dbus-userdb.c:440
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
const char * _dbus_error_from_errno(int error_number)
Converts a UNIX errno, or Windows errno or WinSock error value into a DBusError name.
Definition: dbus-sysdeps.c:599
dbus_bool_t _dbus_group_info_fill(DBusGroupInfo *info, const DBusString *groupname, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group name.
dbus_bool_t _dbus_parse_unix_user_from_config(const DBusString *username, dbus_uid_t *uid_p)
Parse a UNIX user from the bus config file.
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user.
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path.
dbus_bool_t _dbus_unix_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UNIX user ID.
dbus_bool_t _dbus_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as.
dbus_bool_t _dbus_unix_user_is_process_owner(dbus_uid_t uid)
Checks to see if the UNIX user ID matches the UID of the process.
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname.
dbus_bool_t _dbus_windows_user_is_process_owner(const char *windows_sid)
Checks to see if the Windows user SID matches the owner of the process.
dbus_bool_t _dbus_parse_unix_group_from_config(const DBusString *groupname, dbus_gid_t *gid_p)
Parse a UNIX group from the bus config file.
char * _dbus_strdup(const char *str)
Duplicates a string.
dbus_bool_t _dbus_is_console_user(dbus_uid_t uid, DBusError *error)
Checks to see if the UID sent in is the console user.
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory.
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
dbus_bool_t _dbus_get_user_id_and_primary_group(const DBusString *username, dbus_uid_t *uid_p, dbus_gid_t *gid_p)
Gets user ID and primary group given username.
dbus_bool_t _dbus_become_daemon(const DBusString *pidfile, DBusPipe *print_pid_pipe, DBusError *error, dbus_bool_t keep_umask)
Does the chdir, fork, setsid, etc.
dbus_bool_t _dbus_group_info_fill_gid(DBusGroupInfo *info, dbus_gid_t gid, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group ID.
dbus_bool_t _dbus_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids)
Gets all groups corresponding to the given UID.
dbus_bool_t _dbus_unix_user_is_at_console(dbus_uid_t uid, DBusError *error)
Checks to see if the UNIX user ID is at the console.
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username.
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:271
#define NULL
A null pointer, defined appropriately for C or C++.
#define TRUE
Expands to "1".
#define FALSE
Expands to "0".
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:692
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:58
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition: dbus-memory.c:452
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:847
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
Definition: dbus-string.c:980
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:182
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition: dbus-string.c:197
dbus_bool_t _dbus_string_copy(const DBusString *source, int start, DBusString *dest, int insert_at)
Like _dbus_string_move(), but does not delete the section of the source string that's copied to the d...
Definition: dbus-string.c:1345
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString.
Definition: dbus-sysdeps.c:363
dbus_bool_t _dbus_string_steal_data(DBusString *str, char **data_return)
Like _dbus_string_get_data(), but removes the gotten data from the original string.
Definition: dbus-string.c:686
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(), and fills it with the same contents as #_DBUS_STRING_I...
Definition: dbus-string.c:278
void _dbus_string_shorten(DBusString *str, int length_to_remove)
Makes a string shorter by the given number of bytes.
Definition: dbus-string.c:825
dbus_bool_t _dbus_string_find_byte_backward(const DBusString *str, int start, unsigned char byte, int *found)
Find the given byte scanning backward from the given start.
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition: dbus-string.c:1147
dbus_bool_t _dbus_string_copy_len(const DBusString *source, int start, int len, DBusString *dest, int insert_at)
Like _dbus_string_copy(), but can copy a segment from the middle of the source string.
Definition: dbus-string.c:1437
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename.
dbus_bool_t _dbus_reset_oom_score_adj(const char **error_str_p)
If the current process has been protected from the Linux OOM killer (the oom_score_adj process parame...
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
void _dbus_fd_set_close_on_exec(int fd)
Sets the file descriptor to be close on exec.
int _dbus_read(int fd, DBusString *buffer, int count)
Thin wrapper around the read() system call that appends the data it reads to the DBusString buffer.
dbus_bool_t _dbus_ensure_standard_fds(DBusEnsureStandardFdsFlags flags, const char **error_str_p)
Ensure that the standard file descriptors stdin, stdout and stderr are open, by opening /dev/null if ...
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files.
void _dbus_daemon_report_ready(void)
Report to a service manager that the daemon calling this function is ready for use.
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:137
dbus_bool_t _dbus_get_session_config_file(DBusString *str)
Get the absolute path of the session.conf file.
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:135
void _dbus_daemon_report_reloading(void)
Report to a service manager that the daemon calling this function is reloading configuration.
unsigned long dbus_gid_t
A group ID.
Definition: dbus-sysdeps.h:139
dbus_bool_t _dbus_command_for_pid(unsigned long pid, DBusString *str, int max_len, DBusError *error)
Get a printable string describing the command used to execute the process with pid.
dbus_bool_t _dbus_get_system_config_file(DBusString *str)
Get the absolute path of the system.conf file (there is no system bus on Windows so this can just ret...
dbus_bool_t _dbus_set_up_transient_session_servicedirs(DBusList **dirs, DBusError *error)
Returns the standard directories for a session bus to look for transient service activation files.
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:195
dbus_bool_t _dbus_get_standard_system_servicedirs(DBusList **dirs)
Returns the standard directories for a system bus to look for service activation files.
void _dbus_daemon_report_reloaded(void)
Report to a service manager that the daemon calling this function is reloading configuration.
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition: dbus-sysdeps.h:146
void _dbus_daemon_report_stopping(void)
Report to a service manager that the daemon calling this function is shutting down.
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
dbus_bool_t _dbus_split_paths_and_append(DBusString *dirs, const char *suffix, DBusList **dir_list)
Split paths into a list of char strings.
Definition: dbus-sysdeps.c:236
dbus_bool_t _dbus_replace_install_prefix(DBusString *path)
Replace the DBUS_PREFIX in the given path, in-place, by the current D-Bus installation directory.
dbus_bool_t _dbus_ensure_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed.
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
Internals of directory iterator.
DIR * d
The DIR* from opendir()
Object representing an exception.
Definition: dbus-errors.h:49
const char * message
public error message field
Definition: dbus-errors.h:51
Information about a UNIX group.
dbus_gid_t gid
GID.
char * groupname
Group name.
A node in a linked list.
Definition: dbus-list.h:35
Portable struct with stat() results.
Definition: dbus-sysdeps.h:550
unsigned long nlink
Number of hard links.
Definition: dbus-sysdeps.h:552
unsigned long size
Size of file.
Definition: dbus-sysdeps.h:555
dbus_uid_t uid
User owning file.
Definition: dbus-sysdeps.h:553
unsigned long mode
File mode.
Definition: dbus-sysdeps.h:551
dbus_gid_t gid
Group owning file.
Definition: dbus-sysdeps.h:554
unsigned long atime
Access time.
Definition: dbus-sysdeps.h:556
unsigned long ctime
Creation time.
Definition: dbus-sysdeps.h:558
unsigned long mtime
Modify time.
Definition: dbus-sysdeps.h:557