D-Bus: dbus-sysdeps-util-unix.c Source File

D-Bus 1.16.2

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 * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
8 *
9 * Licensed under the Academic Free License version 2.1
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 *
25 */
26
27#include <config.h>
28#include "dbus-sysdeps.h"
29#include "dbus-sysdeps-unix.h"
30#include "dbus-internals.h"
31#include "dbus-list.h"
32#include "dbus-pipe.h"
33#include "dbus-protocol.h"
34#include "dbus-string.h"
35#define DBUS_USERDB_INCLUDES_PRIVATE 1
36#include "dbus-userdb.h"
37#include "dbus-test.h"
38
39#include <sys/types.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <signal.h>
44#include <unistd.h>
45#include <stdio.h>
46#include <errno.h>
47#include <fcntl.h>
48#include <limits.h>
49#include <sys/stat.h>
50#ifdef HAVE_SYS_RESOURCE_H
51#include <sys/resource.h>
52#endif
53#include <grp.h>
54#include <sys/socket.h>
55#include <dirent.h>
56#include <sys/un.h>
57
58#ifdef HAVE_SYS_PRCTL_H
59#include <sys/prctl.h>
60#endif
61
62#ifdef HAVE_SYSTEMD
63#include <systemd/sd-daemon.h>
64#endif
65
66#ifndef O_BINARY
67#define O_BINARY 0
68#endif
69
85dbus_bool_t
86_dbus_become_daemon (const DBusString *pidfile,
87 DBusPipe *print_pid_pipe,
88 DBusError *error,
89 dbus_bool_t keep_umask)
90{
91 const char *s;
92 pid_t child_pid;
93 DBusEnsureStandardFdsFlags flags;
94
95 _dbus_verbose ("Becoming a daemon...\n");
96
97 _dbus_verbose ("chdir to /\n");
98 if (chdir ("/") < 0)
99 {
100 dbus_set_error (error, DBUS_ERROR_FAILED,
101 "Could not chdir() to root directory");
102 return FALSE;
103 }
104
105 _dbus_verbose ("forking...\n");
106
107 /* Make sure our output buffers aren't redundantly printed by both the
108 * parent and the child */
109 fflush (stdout);
110 fflush (stderr);
111
112 switch ((child_pid = fork ()))
113 {
114 case -1:
115 _dbus_verbose ("fork failed\n");
116 dbus_set_error (error, _dbus_error_from_errno (errno),
117 "Failed to fork daemon: %s", _dbus_strerror (errno));
118 return FALSE;
119 break;
120
121 case 0:
122 _dbus_verbose ("in child, closing std file descriptors\n");
123
124 flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
125 s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
126
127 if (s == NULL || *s == '\0')
128 flags |= DBUS_FORCE_STDERR_NULL;
129 else
130 _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
131
132 if (!_dbus_ensure_standard_fds (flags, &s))
133 {
134 _dbus_warn ("%s: %s", s, _dbus_strerror (errno));
135 _exit (1);
136 }
137
138 if (!keep_umask)
139 {
140 /* Get a predictable umask */
141 _dbus_verbose ("setting umask\n");
142 umask (022);
143 }
144
145 _dbus_verbose ("calling setsid()\n");
146 if (setsid () == -1)
147 _dbus_assert_not_reached ("setsid() failed");
148
149 break;
150
151 default:
152 if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
153 child_pid, error))
154 {
155 _dbus_verbose ("pid file or pipe write failed: %s\n",
156 error->message);
157 kill (child_pid, SIGTERM);
158 return FALSE;
159 }
160
161 _dbus_verbose ("parent exiting\n");
162 _exit (0);
163 break;
164 }
165
166 return TRUE;
167}
168
169
178static dbus_bool_t
179_dbus_write_pid_file (const DBusString *filename,
180 unsigned long pid,
181 DBusError *error)
182{
183 const char *cfilename;
184 int fd;
185 FILE *f;
186
187 cfilename = _dbus_string_get_const_data (filename);
188
189 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
190
191 if (fd < 0)
192 {
193 dbus_set_error (error, _dbus_error_from_errno (errno),
194 "Failed to open \"%s\": %s", cfilename,
195 _dbus_strerror (errno));
196 return FALSE;
197 }
198
199 if ((f = fdopen (fd, "w")) == NULL)
200 {
201 dbus_set_error (error, _dbus_error_from_errno (errno),
202 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
203 _dbus_close (fd, NULL);
204 return FALSE;
205 }
206
207 if (fprintf (f, "%lu\n", pid) < 0)
208 {
209 dbus_set_error (error, _dbus_error_from_errno (errno),
210 "Failed to write to \"%s\": %s", cfilename,
211 _dbus_strerror (errno));
212
213 fclose (f);
214 return FALSE;
215 }
216
217 if (fclose (f) == EOF)
218 {
219 dbus_set_error (error, _dbus_error_from_errno (errno),
220 "Failed to close \"%s\": %s", cfilename,
221 _dbus_strerror (errno));
222 return FALSE;
223 }
224
225 return TRUE;
226}
227
239dbus_bool_t
240_dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
241 DBusPipe *print_pid_pipe,
242 dbus_pid_t pid_to_write,
243 DBusError *error)
244{
245 if (pidfile)
246 {
247 _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
248 if (!_dbus_write_pid_file (pidfile,
249 pid_to_write,
250 error))
251 {
252 _dbus_verbose ("pid file write failed\n");
253 _DBUS_ASSERT_ERROR_IS_SET(error);
254 return FALSE;
255 }
256 }
257 else
258 {
259 _dbus_verbose ("No pid file requested\n");
260 }
261
262 if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
263 {
264 DBusString pid;
265 int bytes;
266
267 _dbus_verbose ("writing our pid to pipe %d\n",
268 print_pid_pipe->fd);
269
270 if (!_dbus_string_init (&pid))
271 {
272 _DBUS_SET_OOM (error);
273 return FALSE;
274 }
275
276 if (!_dbus_string_append_printf (&pid, DBUS_PID_FORMAT "\n", pid_to_write))
277 {
278 _dbus_string_free (&pid);
279 _DBUS_SET_OOM (error);
280 return FALSE;
281 }
282
283 bytes = _dbus_string_get_length (&pid);
284 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
285 {
286 /* _dbus_pipe_write sets error only on failure, not short write */
287 if (error != NULL && !dbus_error_is_set(error))
288 {
289 dbus_set_error (error, DBUS_ERROR_FAILED,
290 "Printing message bus PID: did not write enough bytes\n");
291 }
292 _dbus_string_free (&pid);
293 return FALSE;
294 }
295
296 _dbus_string_free (&pid);
297 }
298 else
299 {
300 _dbus_verbose ("No pid pipe to write to\n");
301 }
302
303 return TRUE;
304}
305
312dbus_bool_t
313_dbus_verify_daemon_user (const char *user)
314{
315 DBusString u;
316
317 _dbus_string_init_const (&u, user);
318
319 return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
320}
321
322
323/* The HAVE_LIBAUDIT case lives in selinux.c */
324#ifndef HAVE_LIBAUDIT
332dbus_bool_t
333_dbus_change_to_daemon_user (const char *user,
334 DBusError *error)
335{
336 dbus_uid_t uid;
337 dbus_gid_t gid;
338 DBusString u;
339
340 _dbus_string_init_const (&u, user);
341
342 if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
343 {
344 dbus_set_error (error, DBUS_ERROR_FAILED,
345 "User '%s' does not appear to exist?",
346 user);
347 return FALSE;
348 }
349
350 /* setgroups() only works if we are a privileged process,
351 * so we don't return error on failure; the only possible
352 * failure is that we don't have perms to do it.
353 *
354 * not sure this is right, maybe if setuid()
355 * is going to work then setgroups() should also work.
356 */
357 if (setgroups (0, NULL) < 0)
358 _dbus_warn ("Failed to drop supplementary groups: %s",
359 _dbus_strerror (errno));
360
361 /* Set GID first, or the setuid may remove our permission
362 * to change the GID
363 */
364 if (setgid (gid) < 0)
365 {
366 dbus_set_error (error, _dbus_error_from_errno (errno),
367 "Failed to set GID to %lu: %s", gid,
368 _dbus_strerror (errno));
369 return FALSE;
370 }
371
372 if (setuid (uid) < 0)
373 {
374 dbus_set_error (error, _dbus_error_from_errno (errno),
375 "Failed to set UID to %lu: %s", uid,
376 _dbus_strerror (errno));
377 return FALSE;
378 }
379
380 return TRUE;
381}
382#endif /* !HAVE_LIBAUDIT */
383
384#ifdef HAVE_SETRLIMIT
385
386/* We assume that if we have setrlimit, we also have getrlimit and
387 * struct rlimit.
388 */
389
390struct DBusRLimit {
391 struct rlimit lim;
392};
393
394DBusRLimit *
395_dbus_rlimit_save_fd_limit (DBusError *error)
396{
397 DBusRLimit *self;
398
399 self = dbus_new0 (DBusRLimit, 1);
400
401 if (self == NULL)
402 {
403 _DBUS_SET_OOM (error);
404 return NULL;
405 }
406
407 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
408 {
409 dbus_set_error (error, _dbus_error_from_errno (errno),
410 "Failed to get fd limit: %s", _dbus_strerror (errno));
411 dbus_free (self);
412 return NULL;
413 }
414
415 return self;
416}
417
418/* Enough fds that we shouldn't run out, even if several uids work
419 * together to carry out a denial-of-service attack. This happens to be
420 * the same number that systemd < 234 would normally use. */
421#define ENOUGH_FDS 65536
422
423dbus_bool_t
424_dbus_rlimit_raise_fd_limit (DBusError *error)
425{
426 struct rlimit old, lim;
427
428 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
429 {
430 dbus_set_error (error, _dbus_error_from_errno (errno),
431 "Failed to get fd limit: %s", _dbus_strerror (errno));
432 return FALSE;
433 }
434
435 old = lim;
436
437 if (getuid () == 0)
438 {
439 /* We are privileged, so raise the soft limit to at least
440 * ENOUGH_FDS, and the hard limit to at least the desired soft
441 * limit. This assumes we can exercise CAP_SYS_RESOURCE on Linux,
442 * or other OSs' equivalents. */
443 if (lim.rlim_cur != RLIM_INFINITY &&
444 lim.rlim_cur < ENOUGH_FDS)
445 lim.rlim_cur = ENOUGH_FDS;
446
447 if (lim.rlim_max != RLIM_INFINITY &&
448 lim.rlim_max < lim.rlim_cur)
449 lim.rlim_max = lim.rlim_cur;
450 }
451
452 /* Raise the soft limit to match the hard limit, which we can do even
453 * if we are unprivileged. In particular, systemd >= 240 will normally
454 * set rlim_cur to 1024 and rlim_max to 512*1024, recent Debian
455 * versions end up setting rlim_cur to 1024 and rlim_max to 1024*1024,
456 * and older and non-systemd Linux systems would typically set rlim_cur
457 * to 1024 and rlim_max to 4096. */
458 if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
459 {
460#if defined(__APPLE__) && defined(__MACH__)
461 /* macOS 10.5 and above no longer allows RLIM_INFINITY for rlim_cur */
462 lim.rlim_cur = MIN (OPEN_MAX, lim.rlim_max);
463#else
464 lim.rlim_cur = lim.rlim_max;
465#endif
466 }
467
468 /* Early-return if there is nothing to do. */
469 if (lim.rlim_max == old.rlim_max &&
470 lim.rlim_cur == old.rlim_cur)
471 return TRUE;
472
473 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
474 {
475 dbus_set_error (error, _dbus_error_from_errno (errno),
476 "Failed to set fd limit to %lu: %s",
477 (unsigned long) lim.rlim_cur,
478 _dbus_strerror (errno));
479 return FALSE;
480 }
481
482 return TRUE;
483}
484
485dbus_bool_t
486_dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
487 DBusError *error)
488{
489 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
490 {
491 dbus_set_error (error, _dbus_error_from_errno (errno),
492 "Failed to restore old fd limit: %s",
493 _dbus_strerror (errno));
494 return FALSE;
495 }
496
497 return TRUE;
498}
499
500#else /* !HAVE_SETRLIMIT */
501
502static void
503fd_limit_not_supported (DBusError *error)
504{
505 dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
506 "cannot change fd limit on this platform");
507}
508
509DBusRLimit *
510_dbus_rlimit_save_fd_limit (DBusError *error)
511{
512 fd_limit_not_supported (error);
513 return NULL;
514}
515
516dbus_bool_t
517_dbus_rlimit_raise_fd_limit (DBusError *error)
518{
519 fd_limit_not_supported (error);
520 return FALSE;
521}
522
523dbus_bool_t
524_dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
525 DBusError *error)
526{
527 fd_limit_not_supported (error);
528 return FALSE;
529}
530
531#endif
532
533void
534_dbus_rlimit_free (DBusRLimit *lim)
535{
536 dbus_free (lim);
537}
538
544void
545 _dbus_set_signal_handler (int sig,
546 DBusSignalHandler handler)
547{
548 struct sigaction act;
549 sigset_t empty_mask;
550
551 sigemptyset (&empty_mask);
552 act.sa_handler = handler;
553 act.sa_mask = empty_mask;
554 act.sa_flags = 0;
555 sigaction (sig, &act, NULL);
556}
557
563dbus_bool_t
564 _dbus_file_exists (const char *file)
565{
566 return (access (file, F_OK) == 0);
567}
568
575dbus_bool_t
576_dbus_path_is_absolute (const DBusString *filename)
577{
578 if (_dbus_string_get_length (filename) > 0)
579 return _dbus_string_get_byte (filename, 0) == '/';
580 else
581 return FALSE;
582}
583
592dbus_bool_t
593_dbus_stat (const DBusString *filename,
594 DBusStat *statbuf,
595 DBusError *error)
596{
597 const char *filename_c;
598 struct stat sb;
599
600 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
601
602 filename_c = _dbus_string_get_const_data (filename);
603
604 if (stat (filename_c, &sb) < 0)
605 {
606 dbus_set_error (error, _dbus_error_from_errno (errno),
607 "%s", _dbus_strerror (errno));
608 return FALSE;
609 }
610
611 statbuf->mode = sb.st_mode;
612 statbuf->nlink = sb.st_nlink;
613 statbuf->uid = sb.st_uid;
614 statbuf->gid = sb.st_gid;
615 statbuf->size = sb.st_size;
616 statbuf->atime = sb.st_atime;
617 statbuf->mtime = sb.st_mtime;
618 statbuf->ctime = sb.st_ctime;
619
620 return TRUE;
621}
622
623
627 struct DBusDirIter
628{
629 DIR *d;
631};
632
640 DBusDirIter*
641_dbus_directory_open (const DBusString *filename,
642 DBusError *error)
643{
644 DIR *d;
645 DBusDirIter *iter;
646 const char *filename_c;
647
648 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
649
650 filename_c = _dbus_string_get_const_data (filename);
651
652 d = opendir (filename_c);
653 if (d == NULL)
654 {
655 dbus_set_error (error, _dbus_error_from_errno (errno),
656 "Failed to read directory \"%s\": %s",
657 filename_c,
658 _dbus_strerror (errno));
659 return NULL;
660 }
661 iter = dbus_new0 (DBusDirIter, 1);
662 if (iter == NULL)
663 {
664 closedir (d);
665 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
666 "Could not allocate memory for directory iterator");
667 return NULL;
668 }
669
670 iter->d = d;
671
672 return iter;
673}
674
688dbus_bool_t
689_dbus_directory_get_next_file (DBusDirIter *iter,
690 DBusString *filename,
691 DBusError *error)
692{
693 struct dirent *ent;
694 int err;
695
696 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
697
698 again:
699 errno = 0;
700 ent = readdir (iter->d);
701
702 if (!ent)
703 {
704 err = errno;
705
706 if (err != 0)
707 dbus_set_error (error,
708 _dbus_error_from_errno (err),
709 "%s", _dbus_strerror (err));
710
711 return FALSE;
712 }
713 else if (ent->d_name[0] == '.' &&
714 (ent->d_name[1] == '\0' ||
715 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
716 goto again;
717 else
718 {
719 _dbus_string_set_length (filename, 0);
720 if (!_dbus_string_append (filename, ent->d_name))
721 {
722 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
723 "No memory to read directory entry");
724 return FALSE;
725 }
726 else
727 {
728 return TRUE;
729 }
730 }
731}
732
736void
737_dbus_directory_close (DBusDirIter *iter)
738{
739 closedir (iter->d);
740 dbus_free (iter);
741}
742
743static dbus_bool_t
744fill_user_info_from_group (struct group *g,
745 DBusGroupInfo *info,
746 DBusError *error)
747{
748 _dbus_assert (g->gr_name != NULL);
749
750 info->gid = g->gr_gid;
751 info->groupname = _dbus_strdup (g->gr_name);
752
753 /* info->members = dbus_strdupv (g->gr_mem) */
754
755 if (info->groupname == NULL)
756 {
757 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
758 return FALSE;
759 }
760
761 return TRUE;
762}
763
764static dbus_bool_t
765fill_group_info (DBusGroupInfo *info,
766 dbus_gid_t gid,
767 const DBusString *groupname,
768 DBusError *error)
769{
770 const char *group_c_str;
771
772 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
773 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
774
775 if (groupname)
776 group_c_str = _dbus_string_get_const_data (groupname);
777 else
778 group_c_str = NULL;
779
780 /* For now assuming that the getgrnam() and getgrgid() flavors
781 * always correspond to the pwnam flavors, if not we have
782 * to add more configure checks.
783 */
784
785#ifdef HAVE_GETPWNAM_R
786 {
787 struct group *g;
788 int result;
789 size_t buflen;
790 char *buf;
791 struct group g_str;
792 dbus_bool_t b;
793
794 /* retrieve maximum needed size for buf */
795 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
796
797 /* sysconf actually returns a long, but everything else expects size_t,
798 * so just recast here.
799 * https://bugs.freedesktop.org/show_bug.cgi?id=17061
800 */
801 if ((long) buflen <= 0)
802 buflen = 1024;
803
804 result = -1;
805 while (1)
806 {
807 buf = dbus_malloc (buflen);
808 if (buf == NULL)
809 {
810 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
811 return FALSE;
812 }
813
814 g = NULL;
815 if (group_c_str)
816 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
817 &g);
818 else
819 result = getgrgid_r (gid, &g_str, buf, buflen,
820 &g);
821 /* Try a bigger buffer if ERANGE was returned:
822 https://bugs.freedesktop.org/show_bug.cgi?id=16727
823 */
824 if (result == ERANGE && buflen < 512 * 1024)
825 {
826 dbus_free (buf);
827 buflen *= 2;
828 }
829 else
830 {
831 break;
832 }
833 }
834
835 if (result == 0 && g == &g_str)
836 {
837 b = fill_user_info_from_group (g, info, error);
838 dbus_free (buf);
839 return b;
840 }
841 else
842 {
843 dbus_set_error (error, _dbus_error_from_errno (errno),
844 "Group %s unknown or failed to look it up\n",
845 group_c_str ? group_c_str : "???");
846 dbus_free (buf);
847 return FALSE;
848 }
849 }
850#else /* ! HAVE_GETPWNAM_R */
851 {
852 /* I guess we're screwed on thread safety here */
853 struct group *g;
854
855#warning getpwnam_r() not available, please report this to the dbus maintainers with details of your OS
856
857 g = getgrnam (group_c_str);
858
859 if (g != NULL)
860 {
861 return fill_user_info_from_group (g, info, error);
862 }
863 else
864 {
865 dbus_set_error (error, _dbus_error_from_errno (errno),
866 "Group %s unknown or failed to look it up\n",
867 group_c_str ? group_c_str : "???");
868 return FALSE;
869 }
870 }
871#endif /* ! HAVE_GETPWNAM_R */
872}
873
883dbus_bool_t
884 _dbus_group_info_fill (DBusGroupInfo *info,
885 const DBusString *groupname,
886 DBusError *error)
887{
888 return fill_group_info (info, DBUS_GID_UNSET,
889 groupname, error);
890
891}
892
902dbus_bool_t
903 _dbus_group_info_fill_gid (DBusGroupInfo *info,
904 dbus_gid_t gid,
905 DBusError *error)
906{
907 return fill_group_info (info, gid, NULL, error);
908}
909
918dbus_bool_t
919_dbus_parse_unix_user_from_config (const DBusString *username,
920 dbus_uid_t *uid_p)
921{
922 return _dbus_get_user_id (username, uid_p);
923
924}
925
934dbus_bool_t
935_dbus_parse_unix_group_from_config (const DBusString *groupname,
936 dbus_gid_t *gid_p)
937{
938 return _dbus_get_group_id (groupname, gid_p);
939}
940
952dbus_bool_t
953_dbus_unix_groups_from_uid (dbus_uid_t uid,
954 dbus_gid_t **group_ids,
955 int *n_group_ids,
956 DBusError *error)
957{
958 return _dbus_groups_from_uid (uid, group_ids, n_group_ids, error);
959}
960
970dbus_bool_t
971_dbus_unix_user_is_at_console (dbus_uid_t uid,
972 DBusError *error)
973{
974 return _dbus_is_console_user (uid, error);
975
976}
977
985dbus_bool_t
986_dbus_unix_user_is_process_owner (dbus_uid_t uid)
987{
988 return uid == _dbus_geteuid ();
989}
990
998dbus_bool_t
999_dbus_windows_user_is_process_owner (const char *windows_sid)
1000{
1001 return FALSE;
1002}
1003 /* End of DBusInternalsUtils functions */
1005
1017dbus_bool_t
1018_dbus_string_get_dirname (const DBusString *filename,
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
1060static void
1061string_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
1108dbus_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;
1168oom:
1169 _DBUS_SET_OOM (error);
1170fail:
1171 _dbus_string_free (&cmdline);
1172 _dbus_string_free (&path);
1173 return FALSE;
1174}
1175
1184dbus_bool_t
1185_dbus_replace_install_prefix (DBusString *path)
1186{
1187 return TRUE;
1188}
1189
1190static dbus_bool_t
1191ensure_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 {
1237 dbus_set_error (error, DBUS_ERROR_FAILED,
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 {
1247 dbus_set_error (error, DBUS_ERROR_FAILED,
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
1266dbus_bool_t
1267_dbus_set_up_transient_session_servicedirs (DBusList **dirs,
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
1338out:
1339 _dbus_string_free (&dbus1);
1340 _dbus_string_free (&services);
1341 _dbus_string_free (&xrd);
1342 dbus_free (data);
1343 return ret;
1344}
1345
1363dbus_bool_t
1364_dbus_get_standard_session_servicedirs (DBusList **dirs)
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
1455dbus_bool_t
1456_dbus_get_standard_system_servicedirs (DBusList **dirs)
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
1481
1494dbus_bool_t
1495_dbus_get_local_system_servicedirs (DBusList **dirs)
1496{
1497 static const char standard_search_path[] =
1498 "/etc:"
1499 "/run";
1500 DBusString servicedir_path;
1501
1502 _dbus_string_init_const (&servicedir_path, standard_search_path);
1503
1504 return _dbus_split_paths_and_append (&servicedir_path,
1505 DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
1506 dirs);
1507}
1508
1517dbus_bool_t
1518_dbus_get_system_config_file (DBusString *str)
1519{
1520 _dbus_assert (_dbus_string_get_length (str) == 0);
1521
1522 return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
1523}
1524
1531dbus_bool_t
1532_dbus_get_session_config_file (DBusString *str)
1533{
1534 _dbus_assert (_dbus_string_get_length (str) == 0);
1535
1536 return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
1537}
1538
1543void
1544_dbus_daemon_report_ready (void)
1545{
1546#ifdef HAVE_SYSTEMD
1547 sd_notify (0, "READY=1");
1548#endif
1549}
1550
1555void
1556_dbus_daemon_report_reloading (void)
1557{
1558#ifdef HAVE_SYSTEMD
1559 sd_notify (0, "RELOADING=1");
1560#endif
1561}
1562
1567void
1568_dbus_daemon_report_reloaded (void)
1569{
1570#ifdef HAVE_SYSTEMD
1571 /* For systemd, this is the same code */
1572 _dbus_daemon_report_ready ();
1573#endif
1574}
1575
1580void
1581_dbus_daemon_report_stopping (void)
1582{
1583#ifdef HAVE_SYSTEMD
1584 sd_notify (0, "STOPPING=1");
1585#endif
1586}
1587
1601dbus_bool_t
1602_dbus_reset_oom_score_adj (const char **error_str_p)
1603{
1604#ifdef __linux__
1605 int fd = -1;
1606 dbus_bool_t ret = FALSE;
1607 int saved_errno = 0;
1608 const char *error_str = NULL;
1609
1610#ifdef O_CLOEXEC
1611 fd = open ("/proc/self/oom_score_adj", O_RDONLY | O_CLOEXEC);
1612#endif
1613
1614 if (fd < 0)
1615 {
1616 fd = open ("/proc/self/oom_score_adj", O_RDONLY);
1617 if (fd >= 0)
1618 _dbus_fd_set_close_on_exec (fd);
1619 }
1620
1621 if (fd >= 0)
1622 {
1623 ssize_t read_result = -1;
1624 /* It doesn't actually matter whether we read the whole file,
1625 * as long as we get the presence or absence of the minus sign */
1626 char first_char = '\0';
1627
1628 read_result = read (fd, &first_char, 1);
1629
1630 if (read_result < 0)
1631 {
1632 /* This probably can't actually happen in practice: if we can
1633 * open it, then we can hopefully read from it */
1634 ret = FALSE;
1635 error_str = "failed to read from /proc/self/oom_score_adj";
1636 saved_errno = errno;
1637 goto out;
1638 }
1639
1640 /* If we are running with protection from the OOM killer
1641 * (typical for the system dbus-daemon under systemd), then
1642 * oom_score_adj will be negative. Drop that protection,
1643 * returning to oom_score_adj = 0.
1644 *
1645 * Conversely, if we are running with increased susceptibility
1646 * to the OOM killer (as user sessions typically do in
1647 * systemd >= 250), oom_score_adj will be strictly positive,
1648 * and we are not allowed to decrease it to 0 without privileges.
1649 *
1650 * If it's exactly 0 (typical for non-systemd systems, and
1651 * user processes on older systemd) then there's no need to
1652 * alter it.
1653 *
1654 * We shouldn't get an empty result, but if we do, assume it
1655 * means zero and don't try to change it. */
1656 if (read_result == 0 || first_char != '-')
1657 {
1658 /* Nothing needs to be done: the OOM score adjustment is
1659 * non-negative */
1660 ret = TRUE;
1661 goto out;
1662 }
1663
1664 close (fd);
1665#ifdef O_CLOEXEC
1666 fd = open ("/proc/self/oom_score_adj", O_WRONLY | O_CLOEXEC);
1667
1668 if (fd < 0)
1669#endif
1670 {
1671 fd = open ("/proc/self/oom_score_adj", O_WRONLY);
1672 if (fd >= 0)
1673 _dbus_fd_set_close_on_exec (fd);
1674 }
1675
1676 if (fd < 0)
1677 {
1678 ret = FALSE;
1679 error_str = "open(/proc/self/oom_score_adj) for writing";
1680 saved_errno = errno;
1681 goto out;
1682 }
1683
1684 if (pwrite (fd, "0", sizeof (char), 0) < 0)
1685 {
1686 ret = FALSE;
1687 error_str = "writing oom_score_adj error";
1688 saved_errno = errno;
1689 goto out;
1690 }
1691
1692 /* Success */
1693 ret = TRUE;
1694 }
1695 else if (errno == ENOENT)
1696 {
1697 /* If /proc/self/oom_score_adj doesn't exist, assume the kernel
1698 * doesn't support this feature and ignore it. */
1699 ret = TRUE;
1700 }
1701 else
1702 {
1703 ret = FALSE;
1704 error_str = "open(/proc/self/oom_score_adj) for reading";
1705 saved_errno = errno;
1706 goto out;
1707 }
1708
1709out:
1710 if (fd >= 0)
1711 _dbus_close (fd, NULL);
1712
1713 if (error_str_p != NULL)
1714 *error_str_p = error_str;
1715
1716 errno = saved_errno;
1717 return ret;
1718#else
1719 /* nothing to do on this platform */
1720 return TRUE;
1721#endif
1722}
dbus_set_error
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:356
dbus_error_is_set
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition dbus-errors.c:331
_dbus_stat
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
Definition dbus-sysdeps-util-unix.c:593
_dbus_assert_not_reached
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
Definition dbus-internals.h:164
_dbus_write_pid_to_file_and_pipe
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).
Definition dbus-sysdeps-util-unix.c:240
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition dbus-internals.h:153
_dbus_file_exists
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists.
Definition dbus-sysdeps-util-unix.c:564
_dbus_homedir_from_current_process
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process.
Definition dbus-userdb.c:442
_dbus_directory_close
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
Definition dbus-sysdeps-util-unix.c:737
_dbus_group_info_fill
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.
Definition dbus-sysdeps-util-unix.c:884
_dbus_directory_open
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
Definition dbus-sysdeps-util-unix.c:641
_dbus_parse_unix_user_from_config
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.
Definition dbus-sysdeps-util-unix.c:919
_dbus_verify_daemon_user
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user.
Definition dbus-sysdeps-util-unix.c:313
_dbus_error_from_errno
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:565
_dbus_set_signal_handler
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
Definition dbus-sysdeps-util-unix.c:545
_dbus_path_is_absolute
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path.
Definition dbus-sysdeps-util-unix.c:576
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition dbus-internals.c:621
_dbus_change_to_daemon_user
dbus_bool_t _dbus_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as.
Definition dbus-sysdeps-util-unix.c:333
_dbus_unix_user_is_process_owner
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.
Definition dbus-sysdeps-util-unix.c:986
_dbus_get_group_id
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname.
Definition dbus-userdb-util.c:149
_dbus_windows_user_is_process_owner
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.
Definition dbus-sysdeps-util-unix.c:999
_dbus_parse_unix_group_from_config
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.
Definition dbus-sysdeps-util-unix.c:935
_dbus_unix_groups_from_uid
dbus_bool_t _dbus_unix_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids, DBusError *error)
Gets all groups corresponding to the given UNIX user ID.
Definition dbus-sysdeps-util-unix.c:953
_dbus_is_console_user
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.
Definition dbus-userdb-util.c:71
_dbus_groups_from_uid
dbus_bool_t _dbus_groups_from_uid(dbus_uid_t uid, dbus_gid_t **group_ids, int *n_group_ids, DBusError *error)
Gets all groups corresponding to the given UID.
Definition dbus-userdb-util.c:353
_dbus_directory_get_next_file
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory.
Definition dbus-sysdeps-util-unix.c:689
_dbus_warn
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
Definition dbus-internals.c:278
_dbus_get_user_id_and_primary_group
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.
Definition dbus-userdb-util.c:190
_dbus_become_daemon
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.
Definition dbus-sysdeps-util-unix.c:86
_dbus_group_info_fill_gid
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.
Definition dbus-sysdeps-util-unix.c:903
_dbus_unix_user_is_at_console
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.
Definition dbus-sysdeps-util-unix.c:971
_dbus_get_user_id
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username.
Definition dbus-userdb-util.c:135
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition dbus-list.c:273
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
Definition dbus-macros.h:51
TRUE
#define TRUE
Expands to "1".
Definition dbus-macros.h:41
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:44
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:710
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition dbus-memory.h:60
dbus_malloc
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition dbus-memory.c:470
DBUS_ERROR_NOT_SUPPORTED
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
Definition dbus-protocol.h:375
DBUS_ERROR_FAILED
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
Definition dbus-protocol.h:361
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition dbus-protocol.h:363
_dbus_string_set_length
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition dbus-string.c:847
_dbus_string_append
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_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition dbus-string.c:182
_dbus_string_init_const
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition dbus-string.c:197
_dbus_string_copy
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_string_steal_data
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
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(), and fills it with the same contents as _DBUS_STRING_IN...
Definition dbus-string.c:278
_dbus_string_shorten
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_string_find_byte_backward
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.
Definition dbus-string-util.c:98
_dbus_string_append_printf
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_string_copy_len
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_string_get_dirname
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename.
Definition dbus-sysdeps-util-unix.c:1018
_dbus_reset_oom_score_adj
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...
Definition dbus-sysdeps-util-unix.c:1602
_dbus_close
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
Definition dbus-sysdeps-unix.c:3727
DBusSignalHandler
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Definition dbus-sysdeps-unix.h:158
_dbus_fd_set_close_on_exec
void _dbus_fd_set_close_on_exec(int fd)
Sets the file descriptor to be close on exec.
Definition dbus-sysdeps-unix.c:3683
_dbus_read
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.
Definition dbus-sysdeps-unix.c:767
_dbus_ensure_standard_fds
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 ...
Definition dbus-sysdeps-unix.c:179
_dbus_geteuid
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
Definition dbus-sysdeps-unix.c:3145
_dbus_get_standard_session_servicedirs
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files.
Definition dbus-sysdeps-util-unix.c:1364
_dbus_daemon_report_ready
void _dbus_daemon_report_ready(void)
Report to a service manager that the daemon calling this function is ready for use.
Definition dbus-sysdeps-util-unix.c:1544
dbus_uid_t
unsigned long dbus_uid_t
A user ID.
Definition dbus-sysdeps.h:141
_dbus_get_session_config_file
dbus_bool_t _dbus_get_session_config_file(DBusString *str)
Get the absolute path of the session.conf file.
Definition dbus-sysdeps-util-unix.c:1532
dbus_pid_t
unsigned long dbus_pid_t
A process ID.
Definition dbus-sysdeps.h:139
_dbus_daemon_report_reloading
void _dbus_daemon_report_reloading(void)
Report to a service manager that the daemon calling this function is reloading configuration.
Definition dbus-sysdeps-util-unix.c:1556
dbus_gid_t
unsigned long dbus_gid_t
A group ID.
Definition dbus-sysdeps.h:143
_dbus_command_for_pid
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.
Definition dbus-sysdeps-util-unix.c:1109
_dbus_get_system_config_file
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...
Definition dbus-sysdeps-util-unix.c:1518
_dbus_set_up_transient_session_servicedirs
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.
Definition dbus-sysdeps-util-unix.c:1267
_dbus_getenv
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition dbus-sysdeps.c:197
_dbus_get_standard_system_servicedirs
dbus_bool_t _dbus_get_standard_system_servicedirs(DBusList **dirs)
Returns the standard directories for a system bus to look for service activation files.
Definition dbus-sysdeps-util-unix.c:1456
_dbus_get_local_system_servicedirs
dbus_bool_t _dbus_get_local_system_servicedirs(DBusList **dirs)
Returns the local admin directories for a system bus to look for service activation files.
Definition dbus-sysdeps-util-unix.c:1495
_dbus_daemon_report_reloaded
void _dbus_daemon_report_reloaded(void)
Report to a service manager that the daemon calling this function is reloading configuration.
Definition dbus-sysdeps-util-unix.c:1568
DBUS_GID_UNSET
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition dbus-sysdeps.h:150
_dbus_daemon_report_stopping
void _dbus_daemon_report_stopping(void)
Report to a service manager that the daemon calling this function is shutting down.
Definition dbus-sysdeps-util-unix.c:1581
_dbus_concat_dir_and_file
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
Definition dbus-sysdeps-unix.c:3497
_dbus_split_paths_and_append
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:238
_dbus_replace_install_prefix
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.
Definition dbus-sysdeps-util-unix.c:1185
DBUS_PID_FORMAT
#define DBUS_PID_FORMAT
an appropriate printf format for dbus_pid_t
Definition dbus-sysdeps.h:153
_dbus_ensure_directory
dbus_bool_t _dbus_ensure_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed.
Definition dbus-sysdeps-unix.c:3434
DBusDirIter
Internals of directory iterator.
Definition dbus-sysdeps-util-unix.c:628
DBusDirIter::d
DIR * d
The DIR* from opendir()
Definition dbus-sysdeps-util-unix.c:629
DBusError
Object representing an exception.
Definition dbus-errors.h:51
DBusError::message
const char * message
public error message field
Definition dbus-errors.h:53
DBusGroupInfo
Information about a UNIX group.
Definition dbus-sysdeps-unix.h:107
DBusGroupInfo::gid
dbus_gid_t gid
GID.
Definition dbus-sysdeps-unix.h:109
DBusGroupInfo::groupname
char * groupname
Group name.
Definition dbus-sysdeps-unix.h:110
DBusList
A node in a linked list.
Definition dbus-list.h:37
DBusPipe
Definition dbus-pipe.h:41
DBusStat
Portable struct with stat() results.
Definition dbus-sysdeps.h:570
DBusStat::nlink
unsigned long nlink
Number of hard links.
Definition dbus-sysdeps.h:572
DBusStat::size
unsigned long size
Size of file.
Definition dbus-sysdeps.h:575
DBusStat::uid
dbus_uid_t uid
User owning file.
Definition dbus-sysdeps.h:573
DBusStat::mode
unsigned long mode
File mode.
Definition dbus-sysdeps.h:571
DBusStat::gid
dbus_gid_t gid
Group owning file.
Definition dbus-sysdeps.h:574
DBusStat::atime
unsigned long atime
Access time.
Definition dbus-sysdeps.h:576
DBusStat::ctime
unsigned long ctime
Creation time.
Definition dbus-sysdeps.h:578
DBusStat::mtime
unsigned long mtime
Modify time.
Definition dbus-sysdeps.h:577
DBusString
Definition dbus-string.h:47