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

D-Bus 1.12.16

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 <stdlib.h>
39 #include <string.h>
40 #include <signal.h>
41 #include <unistd.h>
42 #include <stdio.h>
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <sys/stat.h>
46 #ifdef HAVE_SYS_RESOURCE_H
47 #include <sys/resource.h>
48 #endif
49 #include <grp.h>
50 #include <sys/socket.h>
51 #include <dirent.h>
52 #include <sys/un.h>
53
54 #ifdef HAVE_SYS_SYSLIMITS_H
55 #include <sys/syslimits.h>
56 #endif
57
58 #ifdef HAVE_SYSTEMD
59 #include <systemd/sd-daemon.h>
60 #endif
61
62 #ifndef O_BINARY
63 #define O_BINARY 0
64 #endif
65
81 dbus_bool_t
82 _dbus_become_daemon (const DBusString *pidfile,
83 DBusPipe *print_pid_pipe,
84 DBusError *error,
85 dbus_bool_t keep_umask)
86 {
87 const char *s;
88 pid_t child_pid;
89 DBusEnsureStandardFdsFlags flags;
90
91 _dbus_verbose ("Becoming a daemon...\n");
92
93 _dbus_verbose ("chdir to /\n");
94 if (chdir ("/") < 0)
95 {
96 dbus_set_error (error, DBUS_ERROR_FAILED,
97 "Could not chdir() to root directory");
98 return FALSE;
99 }
100
101 _dbus_verbose ("forking...\n");
102 switch ((child_pid = fork ()))
103 {
104 case -1:
105 _dbus_verbose ("fork failed\n");
106 dbus_set_error (error, _dbus_error_from_errno (errno),
107 "Failed to fork daemon: %s", _dbus_strerror (errno));
108 return FALSE;
109 break;
110
111 case 0:
112 _dbus_verbose ("in child, closing std file descriptors\n");
113
114 flags = DBUS_FORCE_STDIN_NULL | DBUS_FORCE_STDOUT_NULL;
115 s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
116
117 if (s == NULL || *s == '\0')
118 flags |= DBUS_FORCE_STDERR_NULL;
119 else
120 _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
121
122 if (!_dbus_ensure_standard_fds (flags, &s))
123 {
124 _dbus_warn ("%s: %s", s, _dbus_strerror (errno));
125 _exit (1);
126 }
127
128 if (!keep_umask)
129 {
130 /* Get a predictable umask */
131 _dbus_verbose ("setting umask\n");
132 umask (022);
133 }
134
135 _dbus_verbose ("calling setsid()\n");
136 if (setsid () == -1)
137 _dbus_assert_not_reached ("setsid() failed");
138
139 break;
140
141 default:
142 if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
143 child_pid, error))
144 {
145 _dbus_verbose ("pid file or pipe write failed: %s\n",
146 error->message);
147 kill (child_pid, SIGTERM);
148 return FALSE;
149 }
150
151 _dbus_verbose ("parent exiting\n");
152 _exit (0);
153 break;
154 }
155
156 return TRUE;
157 }
158
159
168 static dbus_bool_t
169 _dbus_write_pid_file (const DBusString *filename,
170 unsigned long pid,
171 DBusError *error)
172 {
173 const char *cfilename;
174 int fd;
175 FILE *f;
176
177 cfilename = _dbus_string_get_const_data (filename);
178
179 fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
180
181 if (fd < 0)
182 {
183 dbus_set_error (error, _dbus_error_from_errno (errno),
184 "Failed to open \"%s\": %s", cfilename,
185 _dbus_strerror (errno));
186 return FALSE;
187 }
188
189 if ((f = fdopen (fd, "w")) == NULL)
190 {
191 dbus_set_error (error, _dbus_error_from_errno (errno),
192 "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
193 _dbus_close (fd, NULL);
194 return FALSE;
195 }
196
197 if (fprintf (f, "%lu\n", pid) < 0)
198 {
199 dbus_set_error (error, _dbus_error_from_errno (errno),
200 "Failed to write to \"%s\": %s", cfilename,
201 _dbus_strerror (errno));
202
203 fclose (f);
204 return FALSE;
205 }
206
207 if (fclose (f) == EOF)
208 {
209 dbus_set_error (error, _dbus_error_from_errno (errno),
210 "Failed to close \"%s\": %s", cfilename,
211 _dbus_strerror (errno));
212 return FALSE;
213 }
214
215 return TRUE;
216 }
217
229 dbus_bool_t
230 _dbus_write_pid_to_file_and_pipe (const DBusString *pidfile,
231 DBusPipe *print_pid_pipe,
232 dbus_pid_t pid_to_write,
233 DBusError *error)
234 {
235 if (pidfile)
236 {
237 _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
238 if (!_dbus_write_pid_file (pidfile,
239 pid_to_write,
240 error))
241 {
242 _dbus_verbose ("pid file write failed\n");
243 _DBUS_ASSERT_ERROR_IS_SET(error);
244 return FALSE;
245 }
246 }
247 else
248 {
249 _dbus_verbose ("No pid file requested\n");
250 }
251
252 if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
253 {
254 DBusString pid;
255 int bytes;
256
257 _dbus_verbose ("writing our pid to pipe %d\n",
258 print_pid_pipe->fd);
259
260 if (!_dbus_string_init (&pid))
261 {
262 _DBUS_SET_OOM (error);
263 return FALSE;
264 }
265
266 if (!_dbus_string_append_int (&pid, pid_to_write) ||
267 !_dbus_string_append (&pid, "\n"))
268 {
269 _dbus_string_free (&pid);
270 _DBUS_SET_OOM (error);
271 return FALSE;
272 }
273
274 bytes = _dbus_string_get_length (&pid);
275 if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
276 {
277 /* _dbus_pipe_write sets error only on failure, not short write */
278 if (error != NULL && !dbus_error_is_set(error))
279 {
280 dbus_set_error (error, DBUS_ERROR_FAILED,
281 "Printing message bus PID: did not write enough bytes\n");
282 }
283 _dbus_string_free (&pid);
284 return FALSE;
285 }
286
287 _dbus_string_free (&pid);
288 }
289 else
290 {
291 _dbus_verbose ("No pid pipe to write to\n");
292 }
293
294 return TRUE;
295 }
296
303 dbus_bool_t
304 _dbus_verify_daemon_user (const char *user)
305 {
306 DBusString u;
307
308 _dbus_string_init_const (&u, user);
309
310 return _dbus_get_user_id_and_primary_group (&u, NULL, NULL);
311 }
312
313
314 /* The HAVE_LIBAUDIT case lives in selinux.c */
315 #ifndef HAVE_LIBAUDIT
316
323 dbus_bool_t
324 _dbus_change_to_daemon_user (const char *user,
325 DBusError *error)
326 {
327 dbus_uid_t uid;
328 dbus_gid_t gid;
329 DBusString u;
330
331 _dbus_string_init_const (&u, user);
332
333 if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
334 {
335 dbus_set_error (error, DBUS_ERROR_FAILED,
336 "User '%s' does not appear to exist?",
337 user);
338 return FALSE;
339 }
340
341 /* setgroups() only works if we are a privileged process,
342 * so we don't return error on failure; the only possible
343 * failure is that we don't have perms to do it.
344 *
345 * not sure this is right, maybe if setuid()
346 * is going to work then setgroups() should also work.
347 */
348 if (setgroups (0, NULL) < 0)
349 _dbus_warn ("Failed to drop supplementary groups: %s",
350 _dbus_strerror (errno));
351
352 /* Set GID first, or the setuid may remove our permission
353 * to change the GID
354 */
355 if (setgid (gid) < 0)
356 {
357 dbus_set_error (error, _dbus_error_from_errno (errno),
358 "Failed to set GID to %lu: %s", gid,
359 _dbus_strerror (errno));
360 return FALSE;
361 }
362
363 if (setuid (uid) < 0)
364 {
365 dbus_set_error (error, _dbus_error_from_errno (errno),
366 "Failed to set UID to %lu: %s", uid,
367 _dbus_strerror (errno));
368 return FALSE;
369 }
370
371 return TRUE;
372 }
373 #endif /* !HAVE_LIBAUDIT */
374
375 #ifdef HAVE_SETRLIMIT
376
377 /* We assume that if we have setrlimit, we also have getrlimit and
378 * struct rlimit.
379 */
380
381 struct DBusRLimit {
382 struct rlimit lim;
383 };
384
385 DBusRLimit *
386 _dbus_rlimit_save_fd_limit (DBusError *error)
387 {
388 DBusRLimit *self;
389
390 self = dbus_new0 (DBusRLimit, 1);
391
392 if (self == NULL)
393 {
394 _DBUS_SET_OOM (error);
395 return NULL;
396 }
397
398 if (getrlimit (RLIMIT_NOFILE, &self->lim) < 0)
399 {
400 dbus_set_error (error, _dbus_error_from_errno (errno),
401 "Failed to get fd limit: %s", _dbus_strerror (errno));
402 dbus_free (self);
403 return NULL;
404 }
405
406 return self;
407 }
408
409 /* Enough fds that we shouldn't run out, even if several uids work
410 * together to carry out a denial-of-service attack. This happens to be
411 * the same number that systemd < 234 would normally use. */
412 #define ENOUGH_FDS 65536
413
414 dbus_bool_t
415 _dbus_rlimit_raise_fd_limit (DBusError *error)
416 {
417 struct rlimit old, lim;
418
419 if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
420 {
421 dbus_set_error (error, _dbus_error_from_errno (errno),
422 "Failed to get fd limit: %s", _dbus_strerror (errno));
423 return FALSE;
424 }
425
426 old = lim;
427
428 if (getuid () == 0)
429 {
430 /* We are privileged, so raise the soft limit to at least
431 * ENOUGH_FDS, and the hard limit to at least the desired soft
432 * limit. This assumes we can exercise CAP_SYS_RESOURCE on Linux,
433 * or other OSs' equivalents. */
434 if (lim.rlim_cur != RLIM_INFINITY &&
435 lim.rlim_cur < ENOUGH_FDS)
436 lim.rlim_cur = ENOUGH_FDS;
437
438 if (lim.rlim_max != RLIM_INFINITY &&
439 lim.rlim_max < lim.rlim_cur)
440 lim.rlim_max = lim.rlim_cur;
441 }
442
443 /* Raise the soft limit to match the hard limit, which we can do even
444 * if we are unprivileged. In particular, systemd >= 240 will normally
445 * set rlim_cur to 1024 and rlim_max to 512*1024, recent Debian
446 * versions end up setting rlim_cur to 1024 and rlim_max to 1024*1024,
447 * and older and non-systemd Linux systems would typically set rlim_cur
448 * to 1024 and rlim_max to 4096. */
449 if (lim.rlim_max == RLIM_INFINITY || lim.rlim_cur < lim.rlim_max)
450 lim.rlim_cur = lim.rlim_max;
451
452 /* Early-return if there is nothing to do. */
453 if (lim.rlim_max == old.rlim_max &&
454 lim.rlim_cur == old.rlim_cur)
455 return TRUE;
456
457 if (setrlimit (RLIMIT_NOFILE, &lim) < 0)
458 {
459 dbus_set_error (error, _dbus_error_from_errno (errno),
460 "Failed to set fd limit to %lu: %s",
461 (unsigned long) lim.rlim_cur,
462 _dbus_strerror (errno));
463 return FALSE;
464 }
465
466 return TRUE;
467 }
468
469 dbus_bool_t
470 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
471 DBusError *error)
472 {
473 if (setrlimit (RLIMIT_NOFILE, &saved->lim) < 0)
474 {
475 dbus_set_error (error, _dbus_error_from_errno (errno),
476 "Failed to restore old fd limit: %s",
477 _dbus_strerror (errno));
478 return FALSE;
479 }
480
481 return TRUE;
482 }
483
484 #else /* !HAVE_SETRLIMIT */
485
486 static void
487 fd_limit_not_supported (DBusError *error)
488 {
489 dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
490 "cannot change fd limit on this platform");
491 }
492
493 DBusRLimit *
494 _dbus_rlimit_save_fd_limit (DBusError *error)
495 {
496 fd_limit_not_supported (error);
497 return NULL;
498 }
499
500 dbus_bool_t
501 _dbus_rlimit_raise_fd_limit (DBusError *error)
502 {
503 fd_limit_not_supported (error);
504 return FALSE;
505 }
506
507 dbus_bool_t
508 _dbus_rlimit_restore_fd_limit (DBusRLimit *saved,
509 DBusError *error)
510 {
511 fd_limit_not_supported (error);
512 return FALSE;
513 }
514
515 #endif
516
517 void
518 _dbus_rlimit_free (DBusRLimit *lim)
519 {
520 dbus_free (lim);
521 }
522
528 void
529 _dbus_set_signal_handler (int sig,
530 DBusSignalHandler handler)
531 {
532 struct sigaction act;
533 sigset_t empty_mask;
534
535 sigemptyset (&empty_mask);
536 act.sa_handler = handler;
537 act.sa_mask = empty_mask;
538 act.sa_flags = 0;
539 sigaction (sig, &act, NULL);
540 }
541
547 dbus_bool_t
548 _dbus_file_exists (const char *file)
549 {
550 return (access (file, F_OK) == 0);
551 }
552
559 dbus_bool_t
560 _dbus_user_at_console (const char *username,
561 DBusError *error)
562 {
563 #ifdef DBUS_CONSOLE_AUTH_DIR
564 DBusString u, f;
565 dbus_bool_t result;
566
567 result = FALSE;
568 if (!_dbus_string_init (&f))
569 {
570 _DBUS_SET_OOM (error);
571 return FALSE;
572 }
573
574 if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
575 {
576 _DBUS_SET_OOM (error);
577 goto out;
578 }
579
580 _dbus_string_init_const (&u, username);
581
582 if (!_dbus_concat_dir_and_file (&f, &u))
583 {
584 _DBUS_SET_OOM (error);
585 goto out;
586 }
587
588 result = _dbus_file_exists (_dbus_string_get_const_data (&f));
589
590 out:
591 _dbus_string_free (&f);
592
593 return result;
594 #else
595 return FALSE;
596 #endif
597 }
598
599
606 dbus_bool_t
607 _dbus_path_is_absolute (const DBusString *filename)
608 {
609 if (_dbus_string_get_length (filename) > 0)
610 return _dbus_string_get_byte (filename, 0) == '/';
611 else
612 return FALSE;
613 }
614
623 dbus_bool_t
624 _dbus_stat (const DBusString *filename,
625 DBusStat *statbuf,
626 DBusError *error)
627 {
628 const char *filename_c;
629 struct stat sb;
630
631 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
632
633 filename_c = _dbus_string_get_const_data (filename);
634
635 if (stat (filename_c, &sb) < 0)
636 {
637 dbus_set_error (error, _dbus_error_from_errno (errno),
638 "%s", _dbus_strerror (errno));
639 return FALSE;
640 }
641
642 statbuf->mode = sb.st_mode;
643 statbuf->nlink = sb.st_nlink;
644 statbuf->uid = sb.st_uid;
645 statbuf->gid = sb.st_gid;
646 statbuf->size = sb.st_size;
647 statbuf->atime = sb.st_atime;
648 statbuf->mtime = sb.st_mtime;
649 statbuf->ctime = sb.st_ctime;
650
651 return TRUE;
652 }
653
654
658 struct DBusDirIter
659 {
660 DIR *d;
662 };
663
671 DBusDirIter*
672 _dbus_directory_open (const DBusString *filename,
673 DBusError *error)
674 {
675 DIR *d;
676 DBusDirIter *iter;
677 const char *filename_c;
678
679 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
680
681 filename_c = _dbus_string_get_const_data (filename);
682
683 d = opendir (filename_c);
684 if (d == NULL)
685 {
686 dbus_set_error (error, _dbus_error_from_errno (errno),
687 "Failed to read directory \"%s\": %s",
688 filename_c,
689 _dbus_strerror (errno));
690 return NULL;
691 }
692 iter = dbus_new0 (DBusDirIter, 1);
693 if (iter == NULL)
694 {
695 closedir (d);
696 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
697 "Could not allocate memory for directory iterator");
698 return NULL;
699 }
700
701 iter->d = d;
702
703 return iter;
704 }
705
719 dbus_bool_t
720 _dbus_directory_get_next_file (DBusDirIter *iter,
721 DBusString *filename,
722 DBusError *error)
723 {
724 struct dirent *ent;
725 int err;
726
727 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
728
729 again:
730 errno = 0;
731 ent = readdir (iter->d);
732
733 if (!ent)
734 {
735 err = errno;
736
737 if (err != 0)
738 dbus_set_error (error,
739 _dbus_error_from_errno (err),
740 "%s", _dbus_strerror (err));
741
742 return FALSE;
743 }
744 else if (ent->d_name[0] == '.' &&
745 (ent->d_name[1] == '\0' ||
746 (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
747 goto again;
748 else
749 {
750 _dbus_string_set_length (filename, 0);
751 if (!_dbus_string_append (filename, ent->d_name))
752 {
753 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
754 "No memory to read directory entry");
755 return FALSE;
756 }
757 else
758 {
759 return TRUE;
760 }
761 }
762 }
763
767 void
768 _dbus_directory_close (DBusDirIter *iter)
769 {
770 closedir (iter->d);
771 dbus_free (iter);
772 }
773
774 static dbus_bool_t
775 fill_user_info_from_group (struct group *g,
776 DBusGroupInfo *info,
777 DBusError *error)
778 {
779 _dbus_assert (g->gr_name != NULL);
780
781 info->gid = g->gr_gid;
782 info->groupname = _dbus_strdup (g->gr_name);
783
784 /* info->members = dbus_strdupv (g->gr_mem) */
785
786 if (info->groupname == NULL)
787 {
788 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
789 return FALSE;
790 }
791
792 return TRUE;
793 }
794
795 static dbus_bool_t
796 fill_group_info (DBusGroupInfo *info,
797 dbus_gid_t gid,
798 const DBusString *groupname,
799 DBusError *error)
800 {
801 const char *group_c_str;
802
803 _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
804 _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
805
806 if (groupname)
807 group_c_str = _dbus_string_get_const_data (groupname);
808 else
809 group_c_str = NULL;
810
811 /* For now assuming that the getgrnam() and getgrgid() flavors
812 * always correspond to the pwnam flavors, if not we have
813 * to add more configure checks.
814 */
815
816 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
817 {
818 struct group *g;
819 int result;
820 size_t buflen;
821 char *buf;
822 struct group g_str;
823 dbus_bool_t b;
824
825 /* retrieve maximum needed size for buf */
826 buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
827
828 /* sysconf actually returns a long, but everything else expects size_t,
829 * so just recast here.
830 * https://bugs.freedesktop.org/show_bug.cgi?id=17061
831 */
832 if ((long) buflen <= 0)
833 buflen = 1024;
834
835 result = -1;
836 while (1)
837 {
838 buf = dbus_malloc (buflen);
839 if (buf == NULL)
840 {
841 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
842 return FALSE;
843 }
844
845 g = NULL;
846 #ifdef HAVE_POSIX_GETPWNAM_R
847 if (group_c_str)
848 result = getgrnam_r (group_c_str, &g_str, buf, buflen,
849 &g);
850 else
851 result = getgrgid_r (gid, &g_str, buf, buflen,
852 &g);
853 #else
854 g = getgrnam_r (group_c_str, &g_str, buf, buflen);
855 result = 0;
856 #endif /* !HAVE_POSIX_GETPWNAM_R */
857 /* Try a bigger buffer if ERANGE was returned:
858 https://bugs.freedesktop.org/show_bug.cgi?id=16727
859 */
860 if (result == ERANGE && buflen < 512 * 1024)
861 {
862 dbus_free (buf);
863 buflen *= 2;
864 }
865 else
866 {
867 break;
868 }
869 }
870
871 if (result == 0 && g == &g_str)
872 {
873 b = fill_user_info_from_group (g, info, error);
874 dbus_free (buf);
875 return b;
876 }
877 else
878 {
879 dbus_set_error (error, _dbus_error_from_errno (errno),
880 "Group %s unknown or failed to look it up\n",
881 group_c_str ? group_c_str : "???");
882 dbus_free (buf);
883 return FALSE;
884 }
885 }
886 #else /* ! HAVE_GETPWNAM_R */
887 {
888 /* I guess we're screwed on thread safety here */
889 struct group *g;
890
891 g = getgrnam (group_c_str);
892
893 if (g != NULL)
894 {
895 return fill_user_info_from_group (g, info, error);
896 }
897 else
898 {
899 dbus_set_error (error, _dbus_error_from_errno (errno),
900 "Group %s unknown or failed to look it up\n",
901 group_c_str ? group_c_str : "???");
902 return FALSE;
903 }
904 }
905 #endif /* ! HAVE_GETPWNAM_R */
906 }
907
917 dbus_bool_t
918 _dbus_group_info_fill (DBusGroupInfo *info,
919 const DBusString *groupname,
920 DBusError *error)
921 {
922 return fill_group_info (info, DBUS_GID_UNSET,
923 groupname, error);
924
925 }
926
936 dbus_bool_t
937 _dbus_group_info_fill_gid (DBusGroupInfo *info,
938 dbus_gid_t gid,
939 DBusError *error)
940 {
941 return fill_group_info (info, gid, NULL, error);
942 }
943
952 dbus_bool_t
953 _dbus_parse_unix_user_from_config (const DBusString *username,
954 dbus_uid_t *uid_p)
955 {
956 return _dbus_get_user_id (username, uid_p);
957
958 }
959
968 dbus_bool_t
969 _dbus_parse_unix_group_from_config (const DBusString *groupname,
970 dbus_gid_t *gid_p)
971 {
972 return _dbus_get_group_id (groupname, gid_p);
973 }
974
985 dbus_bool_t
986 _dbus_unix_groups_from_uid (dbus_uid_t uid,
987 dbus_gid_t **group_ids,
988 int *n_group_ids)
989 {
990 return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
991 }
992
1002 dbus_bool_t
1003 _dbus_unix_user_is_at_console (dbus_uid_t uid,
1004 DBusError *error)
1005 {
1006 return _dbus_is_console_user (uid, error);
1007
1008 }
1009
1017 dbus_bool_t
1018 _dbus_unix_user_is_process_owner (dbus_uid_t uid)
1019 {
1020 return uid == _dbus_geteuid ();
1021 }
1022
1030 dbus_bool_t
1031 _dbus_windows_user_is_process_owner (const char *windows_sid)
1032 {
1033 return FALSE;
1034 }
1035 /* End of DBusInternalsUtils functions */
1037
1049 dbus_bool_t
1050 _dbus_string_get_dirname (const DBusString *filename,
1051 DBusString *dirname)
1052 {
1053 int sep;
1054
1055 _dbus_assert (filename != dirname);
1056 _dbus_assert (filename != NULL);
1057 _dbus_assert (dirname != NULL);
1058
1059 /* Ignore any separators on the end */
1060 sep = _dbus_string_get_length (filename);
1061 if (sep == 0)
1062 return _dbus_string_append (dirname, "."); /* empty string passed in */
1063
1064 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1065 --sep;
1066
1067 _dbus_assert (sep >= 0);
1068
1069 if (sep == 0)
1070 return _dbus_string_append (dirname, "/");
1071
1072 /* Now find the previous separator */
1073 _dbus_string_find_byte_backward (filename, sep, '/', &sep);
1074 if (sep < 0)
1075 return _dbus_string_append (dirname, ".");
1076
1077 /* skip multiple separators */
1078 while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1079 --sep;
1080
1081 _dbus_assert (sep >= 0);
1082
1083 if (sep == 0 &&
1084 _dbus_string_get_byte (filename, 0) == '/')
1085 return _dbus_string_append (dirname, "/");
1086 else
1087 return _dbus_string_copy_len (filename, 0, sep - 0,
1088 dirname, _dbus_string_get_length (dirname));
1089 } /* DBusString stuff */
1091
1092 static void
1093 string_squash_nonprintable (DBusString *str)
1094 {
1095 unsigned char *buf;
1096 int i, len;
1097
1098 buf = _dbus_string_get_udata (str);
1099 len = _dbus_string_get_length (str);
1100
1101 for (i = 0; i < len; i++)
1102 {
1103 unsigned char c = (unsigned char) buf[i];
1104 if (c == '\0')
1105 buf[i] = ' ';
1106 else if (c < 0x20 || c > 127)
1107 buf[i] = '?';
1108 }
1109 }
1110
1125 dbus_bool_t
1126 _dbus_command_for_pid (unsigned long pid,
1127 DBusString *str,
1128 int max_len,
1129 DBusError *error)
1130 {
1131 /* This is all Linux-specific for now */
1132 DBusString path;
1133 DBusString cmdline;
1134 int fd;
1135
1136 if (!_dbus_string_init (&path))
1137 {
1138 _DBUS_SET_OOM (error);
1139 return FALSE;
1140 }
1141
1142 if (!_dbus_string_init (&cmdline))
1143 {
1144 _DBUS_SET_OOM (error);
1145 _dbus_string_free (&path);
1146 return FALSE;
1147 }
1148
1149 if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
1150 goto oom;
1151
1152 fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1153 if (fd < 0)
1154 {
1155 dbus_set_error (error,
1156 _dbus_error_from_errno (errno),
1157 "Failed to open \"%s\": %s",
1158 _dbus_string_get_const_data (&path),
1159 _dbus_strerror (errno));
1160 goto fail;
1161 }
1162
1163 if (!_dbus_read (fd, &cmdline, max_len))
1164 {
1165 dbus_set_error (error,
1166 _dbus_error_from_errno (errno),
1167 "Failed to read from \"%s\": %s",
1168 _dbus_string_get_const_data (&path),
1169 _dbus_strerror (errno));
1170 _dbus_close (fd, NULL);
1171 goto fail;
1172 }
1173
1174 if (!_dbus_close (fd, error))
1175 goto fail;
1176
1177 string_squash_nonprintable (&cmdline);
1178
1179 if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
1180 goto oom;
1181
1182 _dbus_string_free (&cmdline);
1183 _dbus_string_free (&path);
1184 return TRUE;
1185 oom:
1186 _DBUS_SET_OOM (error);
1187 fail:
1188 _dbus_string_free (&cmdline);
1189 _dbus_string_free (&path);
1190 return FALSE;
1191 }
1192
1201 dbus_bool_t
1202 _dbus_replace_install_prefix (DBusString *path)
1203 {
1204 return TRUE;
1205 }
1206
1207 static dbus_bool_t
1208 ensure_owned_directory (const char *label,
1209 const DBusString *string,
1210 dbus_bool_t create,
1211 DBusError *error)
1212 {
1213 const char *dir = _dbus_string_get_const_data (string);
1214 struct stat buf;
1215
1216 if (create && !_dbus_ensure_directory (string, error))
1217 return FALSE;
1218
1219 /*
1220 * The stat()-based checks in this function are to protect against
1221 * mistakes, not malice. We are working in a directory that is meant
1222 * to be trusted; but if a user has used `su` or similar to escalate
1223 * their privileges without correctly clearing the environment, the
1224 * XDG_RUNTIME_DIR in the environment might still be the user's
1225 * and not root's. We don't want to write root-owned files into that
1226 * directory, so just warn and don't provide support for transient
1227 * services in that case.
1228 *
1229 * In particular, we use stat() and not lstat() so that if we later
1230 * decide to use a different directory name for transient services,
1231 * we can drop in a compatibility symlink without breaking older
1232 * libdbus.
1233 */
1234
1235 if (stat (dir, &buf) != 0)
1236 {
1237 int saved_errno = errno;
1238
1239 dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1240 "%s \"%s\" not available: %s", label, dir,
1241 _dbus_strerror (saved_errno));
1242 return FALSE;
1243 }
1244
1245 if (!S_ISDIR (buf.st_mode))
1246 {
1247 dbus_set_error (error, DBUS_ERROR_FAILED, "%s \"%s\" is not a directory",
1248 label, dir);
1249 return FALSE;
1250 }
1251
1252 if (buf.st_uid != geteuid ())
1253 {
1254 dbus_set_error (error, DBUS_ERROR_FAILED,
1255 "%s \"%s\" is owned by uid %ld, not our uid %ld",
1256 label, dir, (long) buf.st_uid, (long) geteuid ());
1257 return FALSE;
1258 }
1259
1260 /* This is just because we have the stat() results already, so we might
1261 * as well check opportunistically. */
1262 if ((S_IWOTH | S_IWGRP) & buf.st_mode)
1263 {
1264 dbus_set_error (error, DBUS_ERROR_FAILED,
1265 "%s \"%s\" can be written by others (mode 0%o)",
1266 label, dir, buf.st_mode);
1267 return FALSE;
1268 }
1269
1270 return TRUE;
1271 }
1272
1273 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"
1274 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"
1275
1283 dbus_bool_t
1284 _dbus_set_up_transient_session_servicedirs (DBusList **dirs,
1285 DBusError *error)
1286 {
1287 const char *xdg_runtime_dir;
1288 DBusString services;
1289 DBusString dbus1;
1290 DBusString xrd;
1291 dbus_bool_t ret = FALSE;
1292 char *data = NULL;
1293
1294 if (!_dbus_string_init (&dbus1))
1295 {
1296 _DBUS_SET_OOM (error);
1297 return FALSE;
1298 }
1299
1300 if (!_dbus_string_init (&services))
1301 {
1302 _dbus_string_free (&dbus1);
1303 _DBUS_SET_OOM (error);
1304 return FALSE;
1305 }
1306
1307 if (!_dbus_string_init (&xrd))
1308 {
1309 _dbus_string_free (&dbus1);
1310 _dbus_string_free (&services);
1311 _DBUS_SET_OOM (error);
1312 return FALSE;
1313 }
1314
1315 xdg_runtime_dir = _dbus_getenv ("XDG_RUNTIME_DIR");
1316
1317 /* Not an error, we just can't have transient session services */
1318 if (xdg_runtime_dir == NULL)
1319 {
1320 _dbus_verbose ("XDG_RUNTIME_DIR is unset: transient session services "
1321 "not available here\n");
1322 ret = TRUE;
1323 goto out;
1324 }
1325
1326 if (!_dbus_string_append (&xrd, xdg_runtime_dir) ||
1327 !_dbus_string_append_printf (&dbus1, "%s/dbus-1",
1328 xdg_runtime_dir) ||
1329 !_dbus_string_append_printf (&services, "%s/dbus-1/services",
1330 xdg_runtime_dir))
1331 {
1332 _DBUS_SET_OOM (error);
1333 goto out;
1334 }
1335
1336 if (!ensure_owned_directory ("XDG_RUNTIME_DIR", &xrd, FALSE, error) ||
1337 !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &dbus1, TRUE,
1338 error) ||
1339 !ensure_owned_directory ("XDG_RUNTIME_DIR subdirectory", &services,
1340 TRUE, error))
1341 goto out;
1342
1343 if (!_dbus_string_steal_data (&services, &data) ||
1344 !_dbus_list_append (dirs, data))
1345 {
1346 _DBUS_SET_OOM (error);
1347 goto out;
1348 }
1349
1350 _dbus_verbose ("Transient service directory is %s\n", data);
1351 /* Ownership was transferred to @dirs */
1352 data = NULL;
1353 ret = TRUE;
1354
1355 out:
1356 _dbus_string_free (&dbus1);
1357 _dbus_string_free (&services);
1358 _dbus_string_free (&xrd);
1359 dbus_free (data);
1360 return ret;
1361 }
1362
1380 dbus_bool_t
1381 _dbus_get_standard_session_servicedirs (DBusList **dirs)
1382 {
1383 const char *xdg_data_home;
1384 const char *xdg_data_dirs;
1385 DBusString servicedir_path;
1386
1387 if (!_dbus_string_init (&servicedir_path))
1388 return FALSE;
1389
1390 xdg_data_home = _dbus_getenv ("XDG_DATA_HOME");
1391 xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
1392
1393 if (xdg_data_home != NULL)
1394 {
1395 if (!_dbus_string_append (&servicedir_path, xdg_data_home))
1396 goto oom;
1397 }
1398 else
1399 {
1400 const DBusString *homedir;
1401 DBusString local_share;
1402
1403 if (!_dbus_homedir_from_current_process (&homedir))
1404 goto oom;
1405
1406 if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir)))
1407 goto oom;
1408
1409 _dbus_string_init_const (&local_share, "/.local/share");
1410 if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share))
1411 goto oom;
1412 }
1413
1414 if (!_dbus_string_append (&servicedir_path, ":"))
1415 goto oom;
1416
1417 if (xdg_data_dirs != NULL)
1418 {
1419 if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
1420 goto oom;
1421
1422 if (!_dbus_string_append (&servicedir_path, ":"))
1423 goto oom;
1424 }
1425 else
1426 {
1427 if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
1428 goto oom;
1429 }
1430
1431 /*
1432 * add configured datadir to defaults
1433 * this may be the same as an xdg dir
1434 * however the config parser should take
1435 * care of duplicates
1436 */
1437 if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR))
1438 goto oom;
1439
1440 if (!_dbus_split_paths_and_append (&servicedir_path,
1441 DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
1442 dirs))
1443 goto oom;
1444
1445 _dbus_string_free (&servicedir_path);
1446 return TRUE;
1447
1448 oom:
1449 _dbus_string_free (&servicedir_path);
1450 return FALSE;
1451 }
1452
1453
1472 dbus_bool_t
1473 _dbus_get_standard_system_servicedirs (DBusList **dirs)
1474 {
1475 /*
1476 * DBUS_DATADIR may be the same as one of the standard directories. However,
1477 * the config parser should take care of the duplicates.
1478 *
1479 * Also, append /lib as counterpart of /usr/share on the root
1480 * directory (the root directory does not know /share), in order to
1481 * facilitate early boot system bus activation where /usr might not
1482 * be available.
1483 */
1484 static const char standard_search_path[] =
1485 "/usr/local/share:"
1486 "/usr/share:"
1487 DBUS_DATADIR ":"
1488 "/lib";
1489 DBusString servicedir_path;
1490
1491 _dbus_string_init_const (&servicedir_path, standard_search_path);
1492
1493 return _dbus_split_paths_and_append (&servicedir_path,
1494 DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
1495 dirs);
1496 }
1497
1506 dbus_bool_t
1507 _dbus_get_system_config_file (DBusString *str)
1508 {
1509 _dbus_assert (_dbus_string_get_length (str) == 0);
1510
1511 return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
1512 }
1513
1520 dbus_bool_t
1521 _dbus_get_session_config_file (DBusString *str)
1522 {
1523 _dbus_assert (_dbus_string_get_length (str) == 0);
1524
1525 return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
1526 }
1527
1528 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
1529
1530 /*
1531 * Set uid to a machine-readable authentication identity (numeric Unix
1532 * uid or ConvertSidToStringSid-style Windows SID) that is likely to exist,
1533 * and differs from the identity of the current process.
1534 *
1535 * @param uid Populated with a machine-readable authentication identity
1536 * on success
1537 * @returns #FALSE if no memory
1538 */
1539 dbus_bool_t
1540 _dbus_test_append_different_uid (DBusString *uid)
1541 {
1542 if (geteuid () == 0)
1543 return _dbus_string_append (uid, "65534");
1544 else
1545 return _dbus_string_append (uid, "0");
1546 }
1547
1548 /*
1549 * Set uid to a human-readable authentication identity (login name)
1550 * that is likely to exist, and differs from the identity of the current
1551 * process. This function currently only exists on Unix platforms.
1552 *
1553 * @param uid Populated with a machine-readable authentication identity
1554 * on success
1555 * @returns #FALSE if no memory
1556 */
1557 dbus_bool_t
1558 _dbus_test_append_different_username (DBusString *username)
1559 {
1560 if (geteuid () == 0)
1561 return _dbus_string_append (username, "nobody");
1562 else
1563 return _dbus_string_append (username, "root");
1564 }
1565
1566 #endif
_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:935
_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:228
DBusError::message
const char * message
public error message field
Definition: dbus-errors.h:51
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
_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:82
_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:1003
_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:937
_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:1050
_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:3019
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:702
_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:607
DBusStat
Portable struct with stat() results.
Definition: dbus-sysdeps.h:527
_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_ERROR_NOT_SUPPORTED
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
Definition: dbus-protocol.h:369
_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:356
_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:388
_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:969
_dbus_directory_close
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
Definition: dbus-sysdeps-util-unix.c:768
_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:49
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition: dbus-internals.h:152
_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:720
DBusStat::atime
unsigned long atime
Access time.
Definition: dbus-sysdeps.h:534
_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:1381
_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:3082
_dbus_directory_open
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
Definition: dbus-sysdeps-util-unix.c:672
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
_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:1126
_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:1507
_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:1283
DBusGroupInfo::groupname
char * groupname
Group name.
Definition: dbus-sysdeps-unix.h:122
_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:592
DBusDirIter
Internals of directory iterator.
Definition: dbus-sysdeps-util-unix.c:658
DBusStat::mode
unsigned long mode
File mode.
Definition: dbus-sysdeps.h:529
dbus_pid_t
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:132
_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:199
_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:324
DBusDirIter::d
DIR * d
The DIR* from opendir()
Definition: dbus-sysdeps-util-unix.c:660
dbus_malloc
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition: dbus-memory.c:462
DBusStat::gid
dbus_gid_t gid
Group owning file.
Definition: dbus-sysdeps.h:532
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:58
DBusPipe
Definition: dbus-pipe.h:41
DBusString
Definition: dbus-string.h:42
dbus_bool_t
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
_dbus_string_init_const
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition: dbus-string.c:190
_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:1521
_dbus_warn
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
Definition: dbus-internals.c:230
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:270
_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:704
_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:1114
_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:918
_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:160
DBusError
Object representing an exception.
Definition: dbus-errors.h:48
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_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:986
DBusStat::ctime
unsigned long ctime
Creation time.
Definition: dbus-sysdeps.h:536
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:259
DBUS_GID_UNSET
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition: dbus-sysdeps.h:143
_dbus_geteuid
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
Definition: dbus-sysdeps-unix.c:2743
_dbus_file_exists
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists.
Definition: dbus-sysdeps-util-unix.c:548
TRUE
#define TRUE
Expands to "1".
DBusStat::nlink
unsigned long nlink
Number of hard links.
Definition: dbus-sysdeps.h:530
_dbus_assert_not_reached
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
Definition: dbus-internals.h:163
_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:230
DBusStat::uid
dbus_uid_t uid
User owning file.
Definition: dbus-sysdeps.h:531
DBUS_ERROR_FAILED
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
Definition: dbus-protocol.h:355
_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:304
_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:90
_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:395
DBusGroupInfo
Information about a UNIX group.
Definition: dbus-sysdeps-unix.h:119
_dbus_stat
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
Definition: dbus-sysdeps-util-unix.c:624
_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:146
_dbus_set_signal_handler
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
Definition: dbus-sysdeps-util-unix.c:529
DBusList
A node in a linked list.
Definition: dbus-list.h:34
_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:1018
_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:1202
_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:560
_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:1031
_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:1284
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition: dbus-protocol.h:357
_dbus_close
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
Definition: dbus-sysdeps-unix.c:3276
FALSE
#define FALSE
Expands to "0".
DBusStat::mtime
unsigned long mtime
Modify time.
Definition: dbus-sysdeps.h:535
_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:802
_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:1375
_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:641
DBusGroupInfo::gid
dbus_gid_t gid
GID.
Definition: dbus-sysdeps-unix.h:121
DBusSignalHandler
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Definition: dbus-sysdeps-unix.h:169
dbus_gid_t
unsigned long dbus_gid_t
A group ID.
Definition: dbus-sysdeps.h:136
DBusStat::size
unsigned long size
Size of file.
Definition: dbus-sysdeps.h:533
_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:953
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition: dbus-internals.c:536
_dbus_getenv
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:187
dbus_uid_t
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:134
_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:1473
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