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

D-Bus 1.14.4

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 <limits.h>
47#include <sys/stat.h>
48#ifdef HAVE_SYS_RESOURCE_H
49#include <sys/resource.h>
50#endif
51#include <grp.h>
52#include <sys/socket.h>
53#include <dirent.h>
54#include <sys/un.h>
55
56#ifdef HAVE_SYS_PRCTL_H
57#include <sys/prctl.h>
58#endif
59
60#ifdef HAVE_SYSTEMD
61#include <systemd/sd-daemon.h>
62#endif
63
64#ifndef O_BINARY
65#define O_BINARY 0
66#endif
67
83 dbus_bool_t
84_dbus_become_daemon (const DBusString *pidfile,
85 DBusPipe *print_pid_pipe,
86 DBusError *error,
87 dbus_bool_t keep_umask)
88{
89 const char *s;
90 pid_t child_pid;
91 DBusEnsureStandardFdsFlags flags;
92
93 _dbus_verbose ("Becoming a daemon...\n");
94
95 _dbus_verbose ("chdir to /\n");
96 if (chdir ("/") < 0)
97 {
98 dbus_set_error (error, DBUS_ERROR_FAILED,
99 "Could not chdir() to root directory");
100 return FALSE;
101 }
102
103 _dbus_verbose ("forking...\n");
104
105 /* Make sure our output buffers aren't redundantly printed by both the
106 * parent and the child */
107 fflush (stdout);
108 fflush (stderr);
109
110 switch ((child_pid = fork ()))
111 {
112 case -1:
113 _dbus_verbose ("fork failed\n");
114 dbus_set_error (error, _dbus_error_from_errno (errno),
115 "Failed to fork daemon: %s", _dbus_strerror (errno));
116 return FALSE;
117 break;
118
119 case 0:
120 _dbus_verbose ("in child, closing std file descriptors\n");
121
122 flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
123 s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
124
125 if (s == NULL || *s == '\0')
126 flags |= DBUS_FORCE_STDERR_NULL;
127 else
128 _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
129
130 if (!_dbus_ensure_standard_fds (flags, &s))
131 {
132 _dbus_warn ("%s: %s", s, _dbus_strerror (errno));
133 _exit (1);
134 }
135
136 if (!keep_umask)
137 {
138 /* Get a predictable umask */
139 _dbus_verbose ("setting umask\n");
140 umask (022);
141 }
142
143 _dbus_verbose ("calling setsid()\n");
144 if (setsid () == -1)
145 _dbus_assert_not_reached ("setsid() failed");
146
147 break;
148
149 default:
150 if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
151 child_pid, error))
152 {
153 _dbus_verbose ("pid file or pipe write failed: %s\n",
154 error->message);
155 kill (child_pid, SIGTERM);
156 return FALSE;
157 }
158
159 _dbus_verbose ("parent exiting\n");
160 _exit (0);
161 break;
162 }
163
164 return TRUE;
165}
166
167
176static dbus_bool_t
177_dbus_write_pid_file (const DBusString *filename,
178 unsigned long pid,
179 DBusError *error)
180{
181 const char *cfilename;
182 int fd;
183 FILE *f;
184
185 cfilename = _dbus_string_get_const_data (filename);
186
187 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
188
189 if (fd < 0)
190 {
191 dbus_set_error (error, _dbus_error_from_errno (errno),
192 "Failed to open \"%s\": %s", cfilename,
193 _dbus_strerror (errno));
194 return FALSE;
195 }
196
197 if ((f = fdopen (fd, "w")) == NULL)
198 {
199 dbus_set_error (error, _dbus_error_from_errno (errno),
200 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
201 _dbus_close (fd, NULL);
202 return FALSE;
203 }
204
205 if (fprintf (f, "%lu\n", pid) < 0)
206 {
207 dbus_set_error (error, _dbus_error_from_errno (errno),
208 "Failed to write to \"%s\": %s", cfilename,
209 _dbus_strerror (errno));
210
211 fclose (f);
212 return FALSE;
213 }
214
215 if (fclose (f) == EOF)
216 {
217 dbus_set_error (error, _dbus_error_from_errno (errno),
218 "Failed to close \"%s\": %s", cfilename,
219 _dbus_strerror (errno));
220 return FALSE;
221 }
222
223 return TRUE;
224}
225
237 dbus_bool_t
238_dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
239 DBusPipe *print_pid_pipe,
240 dbus_pid_t pid_to_write,
241 DBusError *error)
242{
243 if (pidfile)
244 {
245 _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
246 if (!_dbus_write_pid_file (pidfile,
247 pid_to_write,
248 error))
249 {
250 _dbus_verbose ("pid file write failed\n");
251 _DBUS_ASSERT_ERROR_IS_SET(error);
252 return FALSE;
253 }
254 }
255 else
256 {
257 _dbus_verbose ("No pid file requested\n");
258 }
259
260 if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
261 {
262 DBusString pid;
263 int bytes;
264
265 _dbus_verbose ("writing our pid to pipe %d\n",
266 print_pid_pipe->fd);
267
268 if (!_dbus_string_init (&pid))
269 {
270 _DBUS_SET_OOM (error);
271 return FALSE;
272 }
273
274 if (!_dbus_string_append_int (&pid, pid_to_write) ||
275 !_dbus_string_append (&pid, "\n"))
276 {
277 _dbus_string_free (&pid);
278 _DBUS_SET_OOM (error);
279 return FALSE;
280 }
281
282 bytes = _dbus_string_get_length (&pid);
283 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
284 {
285 /* _dbus_pipe_write sets error only on failure, not short write */
286 if (error != NULL && !dbus_error_is_set(error))
287 {
288 dbus_set_error (error, DBUS_ERROR_FAILED,
289 "Printing message bus PID: did not write enough bytes\n");
290 }
291 _dbus_string_free (&pid);
292 return FALSE;
293 }
294
295 _dbus_string_free (&pid);
296 }
297 else
298 {
299 _dbus_verbose ("No pid pipe to write to\n");
300 }
301
302 return TRUE;
303}
304
311 dbus_bool_t
312_dbus_verify_daemon_user (const char *user)
313{
314 DBusString u;
315
316 _dbus_string_init_const (&u, user);
317
318 return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
319}
320
321
322/* The HAVE_LIBAUDIT case lives in selinux.c */
323#ifndef HAVE_LIBAUDIT
331 dbus_bool_t
332_dbus_change_to_daemon_user (const char *user,
333 DBusError *error)
334{
335 dbus_uid_t uid;
336 dbus_gid_t gid;
337 DBusString u;
338
339 _dbus_string_init_const (&u, user);
340
341 if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
342 {
343 dbus_set_error (error, DBUS_ERROR_FAILED,
344 "User '%s' does not appear to exist?",
345 user);
346 return FALSE;
347 }
348
349 /* setgroups() only works if we are a privileged process,
350 * so we don't return error on failure; the only possible
351 * failure is that we don't have perms to do it.
352 *
353 * not sure this is right, maybe if setuid()
354 * is going to work then setgroups() should also work.
355 */
356 if (setgroups (0, NULL) < 0)
357 _dbus_warn ("Failed to drop supplementary groups: %s",
358 _dbus_strerror (errno));
359
360 /* Set GID first, or the setuid may remove our permission
361 * to change the GID
362 */
363 if (setgid (gid) < 0)
364 {
365 dbus_set_error (error, _dbus_error_from_errno (errno),
366 "Failed to set GID to %lu: %s", gid,
367 _dbus_strerror (errno));
368 return FALSE;
369 }
370
371 if (setuid (uid) < 0)
372 {
373 dbus_set_error (error, _dbus_error_from_errno (errno),
374 "Failed to set UID to %lu: %s", uid,
375 _dbus_strerror (errno));
376 return FALSE;
377 }
378
379 return TRUE;
380}
381#endif /* !HAVE_LIBAUDIT */
382
383#ifdef HAVE_SETRLIMIT
384
385/* We assume that if we have setrlimit, we also have getrlimit and
386 * struct rlimit.
387 */
388
389struct DBusRLimit {
390 struct rlimit lim;
391};
392
393DBusRLimit *
394_dbus_rlimit_save_fd_limit (DBusError *error)
395{
396 DBusRLimit *self;
397
398 self = dbus_new0 (DBusRLimit, 1);
399
400 if (self == NULL)
401 {
402 _DBUS_SET_OOM (error);
403 return NULL;
404 }
405
406 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
407 {
408 dbus_set_error (error, _dbus_error_from_errno (errno),
409 "Failed to get fd limit: %s", _dbus_strerror (errno));
410 dbus_free (self);
411 return NULL;
412 }
413
414 return self;
415}
416
417/* Enough fds that we shouldn't run out, even if several uids work
418 * together to carry out a denial-of-service attack. This happens to be
419 * the same number that systemd < 234 would normally use. */
420#define ENOUGH_FDS 65536
421
422 dbus_bool_t
423_dbus_rlimit_raise_fd_limit (DBusError *error)
424{
425 struct rlimit old, lim;
426
427 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
428 {
429 dbus_set_error (error, _dbus_error_from_errno (errno),
430 "Failed to get fd limit: %s", _dbus_strerror (errno));
431 return FALSE;
432 }
433
434 old = lim;
435
436 if (getuid () == 0)
437 {
438 /* We are privileged, so raise the soft limit to at least
439 * ENOUGH_FDS, and the hard limit to at least the desired soft
440 * limit. This assumes we can exercise CAP_SYS_RESOURCE on Linux,
441 * or other OSs' equivalents. */
442 if (lim.rlim_cur != RLIM_INFINITY &&
443 lim.rlim_cur < ENOUGH_FDS)
444 lim.rlim_cur = ENOUGH_FDS;
445
446 if (lim.rlim_max != RLIM_INFINITY &&
447 lim.rlim_max < lim.rlim_cur)
448 lim.rlim_max = lim.rlim_cur;
449 }
450
451 /* Raise the soft limit to match the hard limit, which we can do even
452 * if we are unprivileged. In particular, systemd >= 240 will normally
453 * set rlim_cur to 1024 and rlim_max to 512*1024, recent Debian
454 * versions end up setting rlim_cur to 1024 and rlim_max to 1024*1024,
455 * and older and non-systemd Linux systems would typically set rlim_cur
456 * to 1024 and rlim_max to 4096. */
457 if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
458 {
459#if defined(__APPLE__) && defined(__MACH__)
460 /* macOS 10.5 and above no longer allows RLIM_INFINITY for rlim_cur */
461 lim.rlim_cur = MIN (OPEN_MAX, lim.rlim_max);
462#else
463 lim.rlim_cur = lim.rlim_max;
464#endif
465 }
466
467 /* Early-return if there is nothing to do. */
468 if (lim.rlim_max == old.rlim_max &&
469 lim.rlim_cur == old.rlim_cur)
470 return TRUE;
471
472 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
473 {
474 dbus_set_error (error, _dbus_error_from_errno (errno),
475 "Failed to set fd limit to %lu: %s",
476 (unsigned long) lim.rlim_cur,
477 _dbus_strerror (errno));
478 return FALSE;
479 }
480
481 return TRUE;
482}
483
484 dbus_bool_t
485_dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
486 DBusError *error)
487{
488 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
489 {
490 dbus_set_error (error, _dbus_error_from_errno (errno),
491 "Failed to restore old fd limit: %s",
492 _dbus_strerror (errno));
493 return FALSE;
494 }
495
496 return TRUE;
497}
498
499#else /* !HAVE_SETRLIMIT */
500
501static void
502fd_limit_not_supported (DBusError *error)
503{
504 dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
505 "cannot change fd limit on this platform");
506}
507
508DBusRLimit *
509_dbus_rlimit_save_fd_limit (DBusError *error)
510{
511 fd_limit_not_supported (error);
512 return NULL;
513}
514
515 dbus_bool_t
516_dbus_rlimit_raise_fd_limit (DBusError *error)
517{
518 fd_limit_not_supported (error);
519 return FALSE;
520}
521
522 dbus_bool_t
523_dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
524 DBusError *error)
525{
526 fd_limit_not_supported (error);
527 return FALSE;
528}
529
530#endif
531
532void
533_dbus_rlimit_free (DBusRLimit *lim)
534{
535 dbus_free (lim);
536}
537
543void
544 _dbus_set_signal_handler (int sig,
545 DBusSignalHandler handler)
546{
547 struct sigaction act;
548 sigset_t empty_mask;
549
550 sigemptyset (&empty_mask);
551 act.sa_handler = handler;
552 act.sa_mask = empty_mask;
553 act.sa_flags = 0;
554 sigaction (sig, &act, NULL);
555}
556
562 dbus_bool_t
563 _dbus_file_exists (const char *file)
564{
565 return (access (file, F_OK) == 0);
566}
567
574 dbus_bool_t
575_dbus_user_at_console (const char *username,
576 DBusError *error)
577{
578#ifdef DBUS_CONSOLE_AUTH_DIR
579 DBusString u, f;
580 dbus_bool_t result;
581
582 result = FALSE;
583 if (!_dbus_string_init (&f))
584 {
585 _DBUS_SET_OOM (error);
586 return FALSE;
587 }
588
589 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
590 {
591 _DBUS_SET_OOM (error);
592 goto out;
593 }
594
595 _dbus_string_init_const (&u, username);
596
597 if (!_dbus_concat_dir_and_file (&f, &u))
598 {
599 _DBUS_SET_OOM (error);
600 goto out;
601 }
602
603 result = _dbus_file_exists (_dbus_string_get_const_data (&f));
604
605 out:
606 _dbus_string_free (&f);
607
608 return result;
609#else
610 return FALSE;
611#endif
612}
613
614
621 dbus_bool_t
622_dbus_path_is_absolute (const DBusString *filename)
623{
624 if (_dbus_string_get_length (filename) > 0)
625 return _dbus_string_get_byte (filename, 0) == '/';
626 else
627 return FALSE;
628}
629
638 dbus_bool_t
639_dbus_stat (const DBusString *filename,
640 DBusStat *statbuf,
641 DBusError *error)
642{
643 const char *filename_c;
644 struct stat sb;
645
646 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
647
648 filename_c = _dbus_string_get_const_data (filename);
649
650 if (stat (filename_c, &sb) < 0)
651 {
652 dbus_set_error (error, _dbus_error_from_errno (errno),
653 "%s", _dbus_strerror (errno));
654 return FALSE;
655 }
656
657 statbuf->mode = sb.st_mode;
658 statbuf->nlink = sb.st_nlink;
659 statbuf->uid = sb.st_uid;
660 statbuf->gid = sb.st_gid;
661 statbuf->size = sb.st_size;
662 statbuf->atime = sb.st_atime;
663 statbuf->mtime = sb.st_mtime;
664 statbuf->ctime = sb.st_ctime;
665
666 return TRUE;
667}
668
669
673 struct DBusDirIter
674{
675 DIR *d;
677};
678
686 DBusDirIter*
687_dbus_directory_open (const DBusString *filename,
688 DBusError *error)
689{
690 DIR *d;
691 DBusDirIter *iter;
692 const char *filename_c;
693
694 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
695
696 filename_c = _dbus_string_get_const_data (filename);
697
698 d = opendir (filename_c);
699 if (d == NULL)
700 {
701 dbus_set_error (error, _dbus_error_from_errno (errno),
702 "Failed to read directory \"%s\": %s",
703 filename_c,
704 _dbus_strerror (errno));
705 return NULL;
706 }
707 iter = dbus_new0 (DBusDirIter, 1);
708 if (iter == NULL)
709 {
710 closedir (d);
711 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
712 "Could not allocate memory for directory iterator");
713 return NULL;
714 }
715
716 iter->d = d;
717
718 return iter;
719}
720
734 dbus_bool_t
735_dbus_directory_get_next_file (DBusDirIter *iter,
736 DBusString *filename,
737 DBusError *error)
738{
739 struct dirent *ent;
740 int err;
741
742 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
743
744 again:
745 errno = 0;
746 ent = readdir (iter->d);
747
748 if (!ent)
749 {
750 err = errno;
751
752 if (err != 0)
753 dbus_set_error (error,
754 _dbus_error_from_errno (err),
755 "%s", _dbus_strerror (err));
756
757 return FALSE;
758 }
759 else if (ent->d_name[0] == '.' &&
760 (ent->d_name[1] == '\0' ||
761 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
762 goto again;
763 else
764 {
765 _dbus_string_set_length (filename, 0);
766 if (!_dbus_string_append (filename, ent->d_name))
767 {
768 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
769 "No memory to read directory entry");
770 return FALSE;
771 }
772 else
773 {
774 return TRUE;
775 }
776 }
777}
778
782void
783_dbus_directory_close (DBusDirIter *iter)
784{
785 closedir (iter->d);
786 dbus_free (iter);
787}
788
789static dbus_bool_t
790fill_user_info_from_group (struct group *g,
791 DBusGroupInfo *info,
792 DBusError *error)
793{
794 _dbus_assert (g->gr_name != NULL);
795
796 info->gid = g->gr_gid;
797 info->groupname = _dbus_strdup (g->gr_name);
798
799 /* info->members = dbus_strdupv (g->gr_mem) */
800
801 if (info->groupname == NULL)
802 {
803 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
804 return FALSE;
805 }
806
807 return TRUE;
808}
809
810static dbus_bool_t
811fill_group_info (DBusGroupInfo *info,
812 dbus_gid_t gid,
813 const DBusString *groupname,
814 DBusError *error)
815{
816 const char *group_c_str;
817
818 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
819 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
820
821 if (groupname)
822 group_c_str = _dbus_string_get_const_data (groupname);
823 else
824 group_c_str = NULL;
825
826 /* For now assuming that the getgrnam() and getgrgid() flavors
827 * always correspond to the pwnam flavors, if not we have
828 * to add more configure checks.
829 */
830
831#ifdef HAVE_GETPWNAM_R
832 {
833 struct group *g;
834 int result;
835 size_t buflen;
836 char *buf;
837 struct group g_str;
838 dbus_bool_t b;
839
840 /* retrieve maximum needed size for buf */
841 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
842
843 /* sysconf actually returns a long, but everything else expects size_t,
844 * so just recast here.
845 * https://bugs.freedesktop.org/show_bug.cgi?id=17061
846 */
847 if ((long) buflen <= 0)
848 buflen = 1024;
849
850 result = -1;
851 while (1)
852 {
853 buf = dbus_malloc (buflen);
854 if (buf == NULL)
855 {
856 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
857 return FALSE;
858 }
859
860 g = NULL;
861 if (group_c_str)
862 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
863 &g);
864 else
865 result = getgrgid_r (gid, &g_str, buf, buflen,
866 &g);
867 /* Try a bigger buffer if ERANGE was returned:
868 https://bugs.freedesktop.org/show_bug.cgi?id=16727
869 */
870 if (result == ERANGE && buflen < 512 * 1024)
871 {
872 dbus_free (buf);
873 buflen *= 2;
874 }
875 else
876 {
877 break;
878 }
879 }
880
881 if (result == 0 && g == &g_str)
882 {
883 b = fill_user_info_from_group (g, info, error);
884 dbus_free (buf);
885 return b;
886 }
887 else
888 {
889 dbus_set_error (error, _dbus_error_from_errno (errno),
890 "Group %s unknown or failed to look it up\n",
891 group_c_str ? group_c_str : "???");
892 dbus_free (buf);
893 return FALSE;
894 }
895 }
896#else /* ! HAVE_GETPWNAM_R */
897 {
898 /* I guess we're screwed on thread safety here */
899 struct group *g;
900
901#warning getpwnam_r() not available, please report this to the dbus maintainers with details of your OS
902
903 g = getgrnam (group_c_str);
904
905 if (g != NULL)
906 {
907 return fill_user_info_from_group (g, info, error);
908 }
909 else
910 {
911 dbus_set_error (error, _dbus_error_from_errno (errno),
912 "Group %s unknown or failed to look it up\n",
913 group_c_str ? group_c_str : "???");
914 return FALSE;
915 }
916 }
917#endif /* ! HAVE_GETPWNAM_R */
918}
919
929 dbus_bool_t
930 _dbus_group_info_fill (DBusGroupInfo *info,
931 const DBusString *groupname,
932 DBusError *error)
933{
934 return fill_group_info (info, DBUS_GID_UNSET,
935 groupname, error);
936
937}
938
948 dbus_bool_t
949 _dbus_group_info_fill_gid (DBusGroupInfo *info,
950 dbus_gid_t gid,
951 DBusError *error)
952{
953 return fill_group_info (info, gid, NULL, error);
954}
955
964 dbus_bool_t
965_dbus_parse_unix_user_from_config (const DBusString *username,
966 dbus_uid_t *uid_p)
967{
968 return _dbus_get_user_id (username, uid_p);
969
970}
971
980 dbus_bool_t
981_dbus_parse_unix_group_from_config (const DBusString *groupname,
982 dbus_gid_t *gid_p)
983{
984 return _dbus_get_group_id (groupname, gid_p);
985}
986
997 dbus_bool_t
998_dbus_unix_groups_from_uid (dbus_uid_t uid,
999 dbus_gid_t **group_ids,
1000 int *n_group_ids)
1001{
1002 return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
1003}
1004
1014 dbus_bool_t
1015_dbus_unix_user_is_at_console (dbus_uid_t uid,
1016 DBusError *error)
1017{
1018 return _dbus_is_console_user (uid, error);
1019
1020}
1021
1029 dbus_bool_t
1030_dbus_unix_user_is_process_owner (dbus_uid_t uid)
1031{
1032 return uid == _dbus_geteuid ();
1033}
1034
1042 dbus_bool_t
1043_dbus_windows_user_is_process_owner (const char *windows_sid)
1044{
1045 return FALSE;
1046}
1047 /* End of DBusInternalsUtils functions */
1049
1061 dbus_bool_t
1062_dbus_string_get_dirname (const DBusString *filename,
1063 DBusString *dirname)
1064{
1065 int sep;
1066
1067 _dbus_assert (filename != dirname);
1068 _dbus_assert (filename != NULL);
1069 _dbus_assert (dirname != NULL);
1070
1071 /* Ignore any separators on the end */
1072 sep = _dbus_string_get_length (filename);
1073 if (sep == 0)
1074 return _dbus_string_append (dirname, "."); /* empty string passed in */
1075
1076 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1077 --sep;
1078
1079 _dbus_assert (sep >= 0);
1080
1081 if (sep == 0)
1082 return _dbus_string_append (dirname, "/");
1083
1084 /* Now find the previous separator */
1085 _dbus_string_find_byte_backward (filename, sep, '/', &sep);
1086 if (sep < 0)
1087 return _dbus_string_append (dirname, ".");
1088
1089 /* skip multiple separators */
1090 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1091 --sep;
1092
1093 _dbus_assert (sep >= 0);
1094
1095 if (sep == 0 &&
1096 _dbus_string_get_byte (filename, 0) == '/')
1097 return _dbus_string_append (dirname, "/");
1098 else
1099 return _dbus_string_copy_len (filename, 0, sep - 0,
1100 dirname, _dbus_string_get_length (dirname));
1101} /* DBusString stuff */
1103
1104static void
1105string_squash_nonprintable (DBusString *str)
1106{
1107 unsigned char *buf;
1108 int i, len;
1109
1110 buf = _dbus_string_get_udata (str);
1111 len = _dbus_string_get_length (str);
1112
1113 /* /proc/$pid/cmdline is a sequence of \0-terminated words, but we
1114 * want a sequence of space-separated words, with no extra trailing
1115 * space:
1116 * "/bin/sleep" "\0" "60" "\0"
1117 * -> "/bin/sleep" "\0" "60"
1118 * -> "/bin/sleep" " " "60"
1119 *
1120 * so chop off the trailing NUL before cleaning up unprintable
1121 * characters. */
1122 if (len > 0 && buf[len - 1] == '\0')
1123 {
1124 _dbus_string_shorten (str, 1);
1125 len--;
1126 }
1127
1128 for (i = 0; i < len; i++)
1129 {
1130 unsigned char c = (unsigned char) buf[i];
1131 if (c == '\0')
1132 buf[i] = ' ';
1133 else if (c < 0x20 || c > 127)
1134 buf[i] = '?';
1135 }
1136}
1137
1152 dbus_bool_t
1153_dbus_command_for_pid (unsigned long pid,
1154 DBusString *str,
1155 int max_len,
1156 DBusError *error)
1157{
1158 /* This is all Linux-specific for now */
1159 DBusString path;
1160 DBusString cmdline;
1161 int fd;
1162
1163 if (!_dbus_string_init (&path))
1164 {
1165 _DBUS_SET_OOM (error);
1166 return FALSE;
1167 }
1168
1169 if (!_dbus_string_init (&cmdline))
1170 {
1171 _DBUS_SET_OOM (error);
1172 _dbus_string_free (&path);
1173 return FALSE;
1174 }
1175
1176 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
1177 goto oom;
1178
1179 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1180 if (fd < 0)
1181 {
1182 dbus_set_error (error,
1183 _dbus_error_from_errno (errno),
1184 "Failed to open \"%s\": %s",
1185 _dbus_string_get_const_data (&path),
1186 _dbus_strerror (errno));
1187 goto fail;
1188 }
1189
1190 if (!_dbus_read (fd, &cmdline, max_len))
1191 {
1192 dbus_set_error (error,
1193 _dbus_error_from_errno (errno),
1194 "Failed to read from \"%s\": %s",
1195 _dbus_string_get_const_data (&path),
1196 _dbus_strerror (errno));
1197 _dbus_close (fd, NULL);
1198 goto fail;
1199 }
1200
1201 if (!_dbus_close (fd, error))
1202 goto fail;
1203
1204 string_squash_nonprintable (&cmdline);
1205
1206 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
1207 goto oom;
1208
1209 _dbus_string_free (&cmdline);
1210 _dbus_string_free (&path);
1211 return TRUE;
1212oom:
1213 _DBUS_SET_OOM (error);
1214fail:
1215 _dbus_string_free (&cmdline);
1216 _dbus_string_free (&path);
1217 return FALSE;
1218}
1219
1228 dbus_bool_t
1229_dbus_replace_install_prefix (DBusString *path)
1230{
1231 return TRUE;
1232}
1233
1234static dbus_bool_t
1235ensure_owned_directory (const char *label,
1236 const DBusString *string,
1237 dbus_bool_t create,
1238 DBusError *error)
1239{
1240 const char *dir = _dbus_string_get_const_data (string);
1241 struct stat buf;
1242
1243 if (create && !_dbus_ensure_directory (string, error))
1244 return FALSE;
1245
1246 /*
1247 * The stat()-based checks in this function are to protect against
1248 * mistakes, not malice. We are working in a directory that is meant
1249 * to be trusted; but if a user has used `su` or similar to escalate
1250 * their privileges without correctly clearing the environment, the
1251 * XDG_RUNTIME_DIR in the environment might still be the user's
1252 * and not root's. We don't want to write root-owned files into that
1253 * directory, so just warn and don't provide support for transient
1254 * services in that case.
1255 *
1256 * In particular, we use stat() and not lstat() so that if we later
1257 * decide to use a different directory name for transient services,
1258 * we can drop in a compatibility symlink without breaking older
1259 * libdbus.
1260 */
1261
1262 if (stat (dir, &buf) != 0)
1263 {
1264 int saved_errno = errno;
1265
1266 dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1267 "%s \"%s\" not available: %s", label, dir,
1268 _dbus_strerror (saved_errno));
1269 return FALSE;
1270 }
1271
1272 if (!S_ISDIR (buf.st_mode))
1273 {
1274 dbus_set_error (error, DBUS_ERROR_FAILED, "%s \"%s\" is not a directory",
1275 label, dir);
1276 return FALSE;
1277 }
1278
1279 if (buf.st_uid != geteuid ())
1280 {
1281 dbus_set_error (error, DBUS_ERROR_FAILED,
1282 "%s \"%s\" is owned by uid %ld, not our uid %ld",
1283 label, dir, (long) buf.st_uid, (long) geteuid ());
1284 return FALSE;
1285 }
1286
1287 /* This is just because we have the stat() results already, so we might
1288 * as well check opportunistically. */
1289 if ((S_IWOTH | S_IWGRP) & buf.st_mode)
1290 {
1291 dbus_set_error (error, DBUS_ERROR_FAILED,
1292 "%s \"%s\" can be written by others (mode 0%o)",
1293 label, dir, buf.st_mode);
1294 return FALSE;
1295 }
1296
1297 return TRUE;
1298}
1299
1300#define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"
1301#define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"
1302
1310 dbus_bool_t
1311_dbus_set_up_transient_session_servicedirs (DBusList **dirs,
1312 DBusError *error)
1313{
1314 const char *xdg_runtime_dir;
1315 DBusString services;
1316 DBusString dbus1;
1317 DBusString xrd;
1318 dbus_bool_t ret = FALSE;
1319 char *data = NULL;
1320
1321 if (!_dbus_string_init (&dbus1))
1322 {
1323 _DBUS_SET_OOM (error);
1324 return FALSE;
1325 }
1326
1327 if (!_dbus_string_init (&services))
1328 {
1329 _dbus_string_free (&dbus1);
1330 _DBUS_SET_OOM (error);
1331 return FALSE;
1332 }
1333
1334 if (!_dbus_string_init (&xrd))
1335 {
1336 _dbus_string_free (&dbus1);
1337 _dbus_string_free (&services);
1338 _DBUS_SET_OOM (error);
1339 return FALSE;
1340 }
1341
1342 xdg_runtime_dir = _dbus_getenv ("XDG_RUNTIME_DIR");
1343
1344 /* Not an error, we just can't have transient session services */
1345 if (xdg_runtime_dir == NULL)
1346 {
1347 _dbus_verbose ("XDG_RUNTIME_DIR is unset: transient session services "
1348 "not available here\n");
1349 ret = TRUE;
1350 goto out;
1351 }
1352
1353 if (!_dbus_string_append (&xrd, xdg_runtime_dir) ||
1354 !_dbus_string_append_printf (&dbus1, "%s/dbus-1",
1355 xdg_runtime_dir) ||
1356 !_dbus_string_append_printf (&services, "%s/dbus-1/services",
1357 xdg_runtime_dir))
1358 {
1359 _DBUS_SET_OOM (error);
1360 goto out;
1361 }
1362
1363 if (!ensure_owned_directory ("XDG_RUNTIME_DIR", &xrd, FALSE, error) ||
1364 !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &dbus1, TRUE,
1365 error) ||
1366 !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &services,
1367 TRUE, error))
1368 goto out;
1369
1370 if (!_dbus_string_steal_data (&services, &data) ||
1371 !_dbus_list_append (dirs, data))
1372 {
1373 _DBUS_SET_OOM (error);
1374 goto out;
1375 }
1376
1377 _dbus_verbose ("Transient service directory is %s\n", data);
1378 /* Ownership was transferred to @dirs */
1379 data = NULL;
1380 ret = TRUE;
1381
1382out:
1383 _dbus_string_free (&dbus1);
1384 _dbus_string_free (&services);
1385 _dbus_string_free (&xrd);
1386 dbus_free (data);
1387 return ret;
1388}
1389
1407 dbus_bool_t
1408_dbus_get_standard_session_servicedirs (DBusList **dirs)
1409{
1410 const char *xdg_data_home;
1411 const char *xdg_data_dirs;
1412 DBusString servicedir_path;
1413
1414 if (!_dbus_string_init (&servicedir_path))
1415 return FALSE;
1416
1417 xdg_data_home = _dbus_getenv ("XDG_DATA_HOME");
1418 xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
1419
1420 if (xdg_data_home != NULL)
1421 {
1422 if (!_dbus_string_append (&servicedir_path, xdg_data_home))
1423 goto oom;
1424 }
1425 else
1426 {
1427 const DBusString *homedir;
1428 DBusString local_share;
1429
1430 if (!_dbus_homedir_from_current_process (&homedir))
1431 goto oom;
1432
1433 if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir)))
1434 goto oom;
1435
1436 _dbus_string_init_const (&local_share, "/.local/share");
1437 if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share))
1438 goto oom;
1439 }
1440
1441 if (!_dbus_string_append (&servicedir_path, ":"))
1442 goto oom;
1443
1444 if (xdg_data_dirs != NULL)
1445 {
1446 if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
1447 goto oom;
1448
1449 if (!_dbus_string_append (&servicedir_path, ":"))
1450 goto oom;
1451 }
1452 else
1453 {
1454 if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
1455 goto oom;
1456 }
1457
1458 /*
1459 * add configured datadir to defaults
1460 * this may be the same as an xdg dir
1461 * however the config parser should take
1462 * care of duplicates
1463 */
1464 if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR))
1465 goto oom;
1466
1467 if (!_dbus_split_paths_and_append (&servicedir_path,
1468 DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
1469 dirs))
1470 goto oom;
1471
1472 _dbus_string_free (&servicedir_path);
1473 return TRUE;
1474
1475 oom:
1476 _dbus_string_free (&servicedir_path);
1477 return FALSE;
1478}
1479
1480
1499 dbus_bool_t
1500_dbus_get_standard_system_servicedirs (DBusList **dirs)
1501{
1502 /*
1503 * DBUS_DATADIR may be the same as one of the standard directories. However,
1504 * the config parser should take care of the duplicates.
1505 *
1506 * Also, append /lib as counterpart of /usr/share on the root
1507 * directory (the root directory does not know /share), in order to
1508 * facilitate early boot system bus activation where /usr might not
1509 * be available.
1510 */
1511 static const char standard_search_path[] =
1512 "/usr/local/share:"
1513 "/usr/share:"
1514 DBUS_DATADIR ":"
1515 "/lib";
1516 DBusString servicedir_path;
1517
1518 _dbus_string_init_const (&servicedir_path, standard_search_path);
1519
1520 return _dbus_split_paths_and_append (&servicedir_path,
1521 DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
1522 dirs);
1523}
1524
1533 dbus_bool_t
1534_dbus_get_system_config_file (DBusString *str)
1535{
1536 _dbus_assert (_dbus_string_get_length (str) == 0);
1537
1538 return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
1539}
1540
1547 dbus_bool_t
1548_dbus_get_session_config_file (DBusString *str)
1549{
1550 _dbus_assert (_dbus_string_get_length (str) == 0);
1551
1552 return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
1553}
1554
1559void
1560_dbus_daemon_report_ready (void)
1561{
1562#ifdef HAVE_SYSTEMD
1563 sd_notify (0, "READY=1");
1564#endif
1565}
1566
1571void
1572_dbus_daemon_report_reloading (void)
1573{
1574#ifdef HAVE_SYSTEMD
1575 sd_notify (0, "RELOADING=1");
1576#endif
1577}
1578
1583void
1584_dbus_daemon_report_reloaded (void)
1585{
1586#ifdef HAVE_SYSTEMD
1587 /* For systemd, this is the same code */
1588 _dbus_daemon_report_ready ();
1589#endif
1590}
1591
1596void
1597_dbus_daemon_report_stopping (void)
1598{
1599#ifdef HAVE_SYSTEMD
1600 sd_notify (0, "STOPPING=1");
1601#endif
1602}
1603
1617 dbus_bool_t
1618_dbus_reset_oom_score_adj (const char **error_str_p)
1619{
1620#ifdef __linux__
1621 int fd = -1;
1622 dbus_bool_t ret = FALSE;
1623 int saved_errno = 0;
1624 const char *error_str = NULL;
1625
1626#ifdef O_CLOEXEC
1627 fd = open ("/proc/self/oom_score_adj", O_RDONLY | O_CLOEXEC);
1628#endif
1629
1630 if (fd < 0)
1631 {
1632 fd = open ("/proc/self/oom_score_adj", O_RDONLY);
1633 if (fd >= 0)
1634 _dbus_fd_set_close_on_exec (fd);
1635 }
1636
1637 if (fd >= 0)
1638 {
1639 ssize_t read_result = -1;
1640 /* It doesn't actually matter whether we read the whole file,
1641 * as long as we get the presence or absence of the minus sign */
1642 char first_char = '\0';
1643
1644 read_result = read (fd, &first_char, 1);
1645
1646 if (read_result < 0)
1647 {
1648 /* This probably can't actually happen in practice: if we can
1649 * open it, then we can hopefully read from it */
1650 ret = FALSE;
1651 error_str = "failed to read from /proc/self/oom_score_adj";
1652 saved_errno = errno;
1653 goto out;
1654 }
1655
1656 /* If we are running with protection from the OOM killer
1657 * (typical for the system dbus-daemon under systemd), then
1658 * oom_score_adj will be negative. Drop that protection,
1659 * returning to oom_score_adj = 0.
1660 *
1661 * Conversely, if we are running with increased susceptibility
1662 * to the OOM killer (as user sessions typically do in
1663 * systemd >= 250), oom_score_adj will be strictly positive,
1664 * and we are not allowed to decrease it to 0 without privileges.
1665 *
1666 * If it's exactly 0 (typical for non-systemd systems, and
1667 * user processes on older systemd) then there's no need to
1668 * alter it.
1669 *
1670 * We shouldn't get an empty result, but if we do, assume it
1671 * means zero and don't try to change it. */
1672 if (read_result == 0 || first_char != '-')
1673 {
1674 /* Nothing needs to be done: the OOM score adjustment is
1675 * non-negative */
1676 ret = TRUE;
1677 goto out;
1678 }
1679
1680 close (fd);
1681#ifdef O_CLOEXEC
1682 fd = open ("/proc/self/oom_score_adj", O_WRONLY | O_CLOEXEC);
1683
1684 if (fd < 0)
1685#endif
1686 {
1687 fd = open ("/proc/self/oom_score_adj", O_WRONLY);
1688 if (fd >= 0)
1689 _dbus_fd_set_close_on_exec (fd);
1690 }
1691
1692 if (fd < 0)
1693 {
1694 ret = FALSE;
1695 error_str = "open(/proc/self/oom_score_adj) for writing";
1696 saved_errno = errno;
1697 goto out;
1698 }
1699
1700 if (pwrite (fd, "0", sizeof (char), 0) < 0)
1701 {
1702 ret = FALSE;
1703 error_str = "writing oom_score_adj error";
1704 saved_errno = errno;
1705 goto out;
1706 }
1707
1708 /* Success */
1709 ret = TRUE;
1710 }
1711 else if (errno == ENOENT)
1712 {
1713 /* If /proc/self/oom_score_adj doesn't exist, assume the kernel
1714 * doesn't support this feature and ignore it. */
1715 ret = TRUE;
1716 }
1717 else
1718 {
1719 ret = FALSE;
1720 error_str = "open(/proc/self/oom_score_adj) for reading";
1721 saved_errno = errno;
1722 goto out;
1723 }
1724
1725out:
1726 if (fd >= 0)
1727 _dbus_close (fd, NULL);
1728
1729 if (error_str_p != NULL)
1730 *error_str_p = error_str;
1731
1732 errno = saved_errno;
1733 return ret;
1734#else
1735 /* nothing to do on this platform */
1736 return TRUE;
1737#endif
1738}
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:354
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:329
_dbus_stat
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
Definition: dbus-sysdeps-util-unix.c:639
_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:238
_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:563
_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:440
_dbus_directory_close
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
Definition: dbus-sysdeps-util-unix.c:783
_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:930
_dbus_user_at_console
dbus_bool_t _dbus_user_at_console(const char *username, DBusError *error)
Checks if user is at the console.
Definition: dbus-sysdeps-util-unix.c:575
_dbus_directory_open
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
Definition: dbus-sysdeps-util-unix.c:687
_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:965
_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:312
_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:599
_dbus_set_signal_handler
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
Definition: dbus-sysdeps-util-unix.c:544
_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:622
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition: dbus-internals.c:589
_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)
Gets all groups corresponding to the given UNIX user ID.
Definition: dbus-sysdeps-util-unix.c:998
_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:332
_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:1030
_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:176
_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:1043
_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:981
_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:65
_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:735
_dbus_warn
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
Definition: dbus-internals.c:238
_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:217
_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:84
_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:949
_dbus_groups_from_uid
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.
Definition: dbus-userdb-util.c:379
_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:1015
_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:162
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:271
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
TRUE
#define TRUE
Expands to "1".
FALSE
#define FALSE
Expands to "0".
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:692
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:58
dbus_malloc
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition: dbus-memory.c:452
DBUS_ERROR_NOT_SUPPORTED
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
Definition: dbus-protocol.h:373
DBUS_ERROR_FAILED
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
Definition: dbus-protocol.h:359
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition: dbus-protocol.h:361
_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:833
_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:966
_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:1343
_dbus_string_append_int
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_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:672
_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_I...
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:811
_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:96
_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:1145
_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:1435
_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:1062
_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:1618
_dbus_close
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
Definition: dbus-sysdeps-unix.c:3566
DBusSignalHandler
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Definition: dbus-sysdeps-unix.h:172
_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:3522
_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:731
_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:155
_dbus_geteuid
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
Definition: dbus-sysdeps-unix.c:3001
_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:1408
_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:1560
dbus_uid_t
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:137
_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:1548
dbus_pid_t
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:135
_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:1572
dbus_gid_t
unsigned long dbus_gid_t
A group ID.
Definition: dbus-sysdeps.h:139
_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:1153
_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:1534
_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:1311
_dbus_getenv
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:195
_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:1500
_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:1584
DBUS_GID_UNSET
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition: dbus-sysdeps.h:146
_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:1597
_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:3336
_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:236
_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:1229
_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:3273
dbus_bool_t
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
DBusDirIter
Internals of directory iterator.
Definition: dbus-sysdeps-util-unix.c:674
DBusDirIter::d
DIR * d
The DIR* from opendir()
Definition: dbus-sysdeps-util-unix.c:675
DBusError
Object representing an exception.
Definition: dbus-errors.h:49
DBusError::message
const char * message
public error message field
Definition: dbus-errors.h:51
DBusGroupInfo
Information about a UNIX group.
Definition: dbus-sysdeps-unix.h:121
DBusGroupInfo::gid
dbus_gid_t gid
GID.
Definition: dbus-sysdeps-unix.h:123
DBusGroupInfo::groupname
char * groupname
Group name.
Definition: dbus-sysdeps-unix.h:124
DBusList
A node in a linked list.
Definition: dbus-list.h:35
DBusPipe
Definition: dbus-pipe.h:41
DBusStat
Portable struct with stat() results.
Definition: dbus-sysdeps.h:550
DBusStat::nlink
unsigned long nlink
Number of hard links.
Definition: dbus-sysdeps.h:552
DBusStat::size
unsigned long size
Size of file.
Definition: dbus-sysdeps.h:555
DBusStat::uid
dbus_uid_t uid
User owning file.
Definition: dbus-sysdeps.h:553
DBusStat::mode
unsigned long mode
File mode.
Definition: dbus-sysdeps.h:551
DBusStat::gid
dbus_gid_t gid
Group owning file.
Definition: dbus-sysdeps.h:554
DBusStat::atime
unsigned long atime
Access time.
Definition: dbus-sysdeps.h:556
DBusStat::ctime
unsigned long ctime
Creation time.
Definition: dbus-sysdeps.h:558
DBusStat::mtime
unsigned long mtime
Modify time.
Definition: dbus-sysdeps.h:557
DBusString
Definition: dbus-string.h:43