D-Bus  1.8.4
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-pipe.h"
30 #include "dbus-protocol.h"
31 #include "dbus-string.h"
32 #define DBUS_USERDB_INCLUDES_PRIVATE 1
33 #include "dbus-userdb.h"
34 #include "dbus-test.h"
35 
36 #include <sys/types.h>
37 #include <stdlib.h>
38 #include <string.h>
39 #include <signal.h>
40 #include <unistd.h>
41 #include <stdio.h>
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <sys/stat.h>
45 #ifdef HAVE_SYS_RESOURCE_H
46 #include <sys/resource.h>
47 #endif
48 #include <grp.h>
49 #include <sys/socket.h>
50 #include <dirent.h>
51 #include <sys/un.h>
52 
53 #ifdef HAVE_SYSLOG_H
54 #include <syslog.h>
55 #endif
56 
57 #ifdef HAVE_SYS_SYSLIMITS_H
58 #include <sys/syslimits.h>
59 #endif
60 
61 #include "sd-daemon.h"
62 
63 #ifndef O_BINARY
64 #define O_BINARY 0
65 #endif
66 
84  DBusPipe *print_pid_pipe,
85  DBusError *error,
86  dbus_bool_t keep_umask)
87 {
88  const char *s;
89  pid_t child_pid;
90  int dev_null_fd;
91 
92  _dbus_verbose ("Becoming a daemon...\n");
93 
94  _dbus_verbose ("chdir to /\n");
95  if (chdir ("/") < 0)
96  {
98  "Could not chdir() to root directory");
99  return FALSE;
100  }
101 
102  _dbus_verbose ("forking...\n");
103  switch ((child_pid = fork ()))
104  {
105  case -1:
106  _dbus_verbose ("fork failed\n");
107  dbus_set_error (error, _dbus_error_from_errno (errno),
108  "Failed to fork daemon: %s", _dbus_strerror (errno));
109  return FALSE;
110  break;
111 
112  case 0:
113  _dbus_verbose ("in child, closing std file descriptors\n");
114 
115  /* silently ignore failures here, if someone
116  * doesn't have /dev/null we may as well try
117  * to continue anyhow
118  */
119 
120  dev_null_fd = open ("/dev/null", O_RDWR);
121  if (dev_null_fd >= 0)
122  {
123  dup2 (dev_null_fd, 0);
124  dup2 (dev_null_fd, 1);
125 
126  s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
127  if (s == NULL || *s == '\0')
128  dup2 (dev_null_fd, 2);
129  else
130  _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
131  close (dev_null_fd);
132  }
133 
134  if (!keep_umask)
135  {
136  /* Get a predictable umask */
137  _dbus_verbose ("setting umask\n");
138  umask (022);
139  }
140 
141  _dbus_verbose ("calling setsid()\n");
142  if (setsid () == -1)
143  _dbus_assert_not_reached ("setsid() failed");
144 
145  break;
146 
147  default:
148  if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
149  child_pid, error))
150  {
151  _dbus_verbose ("pid file or pipe write failed: %s\n",
152  error->message);
153  kill (child_pid, SIGTERM);
154  return FALSE;
155  }
156 
157  _dbus_verbose ("parent exiting\n");
158  _exit (0);
159  break;
160  }
161 
162  return TRUE;
163 }
164 
165 
174 static dbus_bool_t
175 _dbus_write_pid_file (const DBusString *filename,
176  unsigned long pid,
177  DBusError *error)
178 {
179  const char *cfilename;
180  int fd;
181  FILE *f;
182 
183  cfilename = _dbus_string_get_const_data (filename);
184 
185  fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
186 
187  if (fd < 0)
188  {
189  dbus_set_error (error, _dbus_error_from_errno (errno),
190  "Failed to open \"%s\": %s", cfilename,
191  _dbus_strerror (errno));
192  return FALSE;
193  }
194 
195  if ((f = fdopen (fd, "w")) == NULL)
196  {
197  dbus_set_error (error, _dbus_error_from_errno (errno),
198  "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
199  _dbus_close (fd, NULL);
200  return FALSE;
201  }
202 
203  if (fprintf (f, "%lu\n", pid) < 0)
204  {
205  dbus_set_error (error, _dbus_error_from_errno (errno),
206  "Failed to write to \"%s\": %s", cfilename,
207  _dbus_strerror (errno));
208 
209  fclose (f);
210  return FALSE;
211  }
212 
213  if (fclose (f) == EOF)
214  {
215  dbus_set_error (error, _dbus_error_from_errno (errno),
216  "Failed to close \"%s\": %s", cfilename,
217  _dbus_strerror (errno));
218  return FALSE;
219  }
220 
221  return TRUE;
222 }
223 
237  DBusPipe *print_pid_pipe,
238  dbus_pid_t pid_to_write,
239  DBusError *error)
240 {
241  if (pidfile)
242  {
243  _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
244  if (!_dbus_write_pid_file (pidfile,
245  pid_to_write,
246  error))
247  {
248  _dbus_verbose ("pid file write failed\n");
249  _DBUS_ASSERT_ERROR_IS_SET(error);
250  return FALSE;
251  }
252  }
253  else
254  {
255  _dbus_verbose ("No pid file requested\n");
256  }
257 
258  if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
259  {
260  DBusString pid;
261  int bytes;
262 
263  _dbus_verbose ("writing our pid to pipe %d\n",
264  print_pid_pipe->fd);
265 
266  if (!_dbus_string_init (&pid))
267  {
268  _DBUS_SET_OOM (error);
269  return FALSE;
270  }
271 
272  if (!_dbus_string_append_int (&pid, pid_to_write) ||
273  !_dbus_string_append (&pid, "\n"))
274  {
275  _dbus_string_free (&pid);
276  _DBUS_SET_OOM (error);
277  return FALSE;
278  }
279 
280  bytes = _dbus_string_get_length (&pid);
281  if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
282  {
283  /* _dbus_pipe_write sets error only on failure, not short write */
284  if (error != NULL && !dbus_error_is_set(error))
285  {
287  "Printing message bus PID: did not write enough bytes\n");
288  }
289  _dbus_string_free (&pid);
290  return FALSE;
291  }
292 
293  _dbus_string_free (&pid);
294  }
295  else
296  {
297  _dbus_verbose ("No pid pipe to write to\n");
298  }
299 
300  return TRUE;
301 }
302 
310 _dbus_verify_daemon_user (const char *user)
311 {
312  DBusString u;
313 
314  _dbus_string_init_const (&u, user);
315 
317 }
318 
319 
320 /* The HAVE_LIBAUDIT case lives in selinux.c */
321 #ifndef HAVE_LIBAUDIT
322 
330 _dbus_change_to_daemon_user (const char *user,
331  DBusError *error)
332 {
333  dbus_uid_t uid;
334  dbus_gid_t gid;
335  DBusString u;
336 
337  _dbus_string_init_const (&u, user);
338 
339  if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
340  {
342  "User '%s' does not appear to exist?",
343  user);
344  return FALSE;
345  }
346 
347  /* setgroups() only works if we are a privileged process,
348  * so we don't return error on failure; the only possible
349  * failure is that we don't have perms to do it.
350  *
351  * not sure this is right, maybe if setuid()
352  * is going to work then setgroups() should also work.
353  */
354  if (setgroups (0, NULL) < 0)
355  _dbus_warn ("Failed to drop supplementary groups: %s\n",
356  _dbus_strerror (errno));
357 
358  /* Set GID first, or the setuid may remove our permission
359  * to change the GID
360  */
361  if (setgid (gid) < 0)
362  {
363  dbus_set_error (error, _dbus_error_from_errno (errno),
364  "Failed to set GID to %lu: %s", gid,
365  _dbus_strerror (errno));
366  return FALSE;
367  }
368 
369  if (setuid (uid) < 0)
370  {
371  dbus_set_error (error, _dbus_error_from_errno (errno),
372  "Failed to set UID to %lu: %s", uid,
373  _dbus_strerror (errno));
374  return FALSE;
375  }
376 
377  return TRUE;
378 }
379 #endif /* !HAVE_LIBAUDIT */
380 
381 
392 void
394 {
395 #ifdef HAVE_SETRLIMIT
396  struct rlimit lim;
397  struct rlimit target_lim;
398 
399  /* No point to doing this practically speaking
400  * if we're not uid 0. We expect the system
401  * bus to use this before we change UID, and
402  * the session bus takes the Linux default
403  * of 1024 for both cur and max.
404  */
405  if (getuid () != 0)
406  return;
407 
408  if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
409  return;
410 
411  if (lim.rlim_cur >= limit)
412  return;
413 
414  /* Ignore "maximum limit", assume we have the "superuser"
415  * privileges. On Linux this is CAP_SYS_RESOURCE.
416  */
417  target_lim.rlim_cur = target_lim.rlim_max = limit;
418  /* Also ignore errors; if we fail, we will at least work
419  * up to whatever limit we had, which seems better than
420  * just outright aborting.
421  *
422  * However, in the future we should probably log this so OS builders
423  * have a chance to notice any misconfiguration like dbus-daemon
424  * being started without CAP_SYS_RESOURCE.
425  */
426  setrlimit (RLIMIT_NOFILE, &target_lim);
427 #endif
428 }
429 
430 void
431 _dbus_init_system_log (dbus_bool_t is_daemon)
432 {
433 #ifdef HAVE_SYSLOG_H
434  int logopts = LOG_PID;
435 
436 #if HAVE_DECL_LOG_PERROR
437 #ifdef HAVE_SYSTEMD
438  if (!is_daemon || sd_booted () <= 0)
439 #endif
440  logopts |= LOG_PERROR;
441 #endif
442 
443  openlog ("dbus", logopts, LOG_DAEMON);
444 #endif
445 }
446 
453 void
454 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
455 {
456  va_list args;
457 
458  va_start (args, msg);
459 
460  _dbus_system_logv (severity, msg, args);
461 
462  va_end (args);
463 }
464 
475 void
476 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
477 {
478  va_list tmp;
479 #ifdef HAVE_SYSLOG_H
480  int flags;
481  switch (severity)
482  {
483  case DBUS_SYSTEM_LOG_INFO:
484  flags = LOG_DAEMON | LOG_NOTICE;
485  break;
486  case DBUS_SYSTEM_LOG_SECURITY:
487  flags = LOG_AUTH | LOG_NOTICE;
488  break;
489  case DBUS_SYSTEM_LOG_FATAL:
490  flags = LOG_DAEMON|LOG_CRIT;
491  break;
492  default:
493  return;
494  }
495 
496  DBUS_VA_COPY (tmp, args);
497  vsyslog (flags, msg, tmp);
498  va_end (tmp);
499 #endif
500 
501 #if !defined(HAVE_SYSLOG_H) || !HAVE_DECL_LOG_PERROR
502  {
503  /* vsyslog() won't write to stderr, so we'd better do it */
504  DBUS_VA_COPY (tmp, args);
505  fprintf (stderr, "dbus[" DBUS_PID_FORMAT "]: ", _dbus_getpid ());
506  vfprintf (stderr, msg, tmp);
507  fputc ('\n', stderr);
508  va_end (tmp);
509  }
510 #endif
511 
512  if (severity == DBUS_SYSTEM_LOG_FATAL)
513  exit (1);
514 }
515 
521 void
523  DBusSignalHandler handler)
524 {
525  struct sigaction act;
526  sigset_t empty_mask;
527 
528  sigemptyset (&empty_mask);
529  act.sa_handler = handler;
530  act.sa_mask = empty_mask;
531  act.sa_flags = 0;
532  sigaction (sig, &act, NULL);
533 }
534 
541 _dbus_file_exists (const char *file)
542 {
543  return (access (file, F_OK) == 0);
544 }
545 
553 _dbus_user_at_console (const char *username,
554  DBusError *error)
555 {
556 
557  DBusString u, f;
558  dbus_bool_t result;
559 
560  result = FALSE;
561  if (!_dbus_string_init (&f))
562  {
563  _DBUS_SET_OOM (error);
564  return FALSE;
565  }
566 
567  if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
568  {
569  _DBUS_SET_OOM (error);
570  goto out;
571  }
572 
573  _dbus_string_init_const (&u, username);
574 
575  if (!_dbus_concat_dir_and_file (&f, &u))
576  {
577  _DBUS_SET_OOM (error);
578  goto out;
579  }
580 
582 
583  out:
584  _dbus_string_free (&f);
585 
586  return result;
587 }
588 
589 
598 {
599  if (_dbus_string_get_length (filename) > 0)
600  return _dbus_string_get_byte (filename, 0) == '/';
601  else
602  return FALSE;
603 }
604 
614 _dbus_stat (const DBusString *filename,
615  DBusStat *statbuf,
616  DBusError *error)
617 {
618  const char *filename_c;
619  struct stat sb;
620 
621  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
622 
623  filename_c = _dbus_string_get_const_data (filename);
624 
625  if (stat (filename_c, &sb) < 0)
626  {
627  dbus_set_error (error, _dbus_error_from_errno (errno),
628  "%s", _dbus_strerror (errno));
629  return FALSE;
630  }
631 
632  statbuf->mode = sb.st_mode;
633  statbuf->nlink = sb.st_nlink;
634  statbuf->uid = sb.st_uid;
635  statbuf->gid = sb.st_gid;
636  statbuf->size = sb.st_size;
637  statbuf->atime = sb.st_atime;
638  statbuf->mtime = sb.st_mtime;
639  statbuf->ctime = sb.st_ctime;
640 
641  return TRUE;
642 }
643 
644 
649 {
650  DIR *d;
652 };
653 
663  DBusError *error)
664 {
665  DIR *d;
666  DBusDirIter *iter;
667  const char *filename_c;
668 
669  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
670 
671  filename_c = _dbus_string_get_const_data (filename);
672 
673  d = opendir (filename_c);
674  if (d == NULL)
675  {
676  dbus_set_error (error, _dbus_error_from_errno (errno),
677  "Failed to read directory \"%s\": %s",
678  filename_c,
679  _dbus_strerror (errno));
680  return NULL;
681  }
682  iter = dbus_new0 (DBusDirIter, 1);
683  if (iter == NULL)
684  {
685  closedir (d);
687  "Could not allocate memory for directory iterator");
688  return NULL;
689  }
690 
691  iter->d = d;
692 
693  return iter;
694 }
695 
711  DBusString *filename,
712  DBusError *error)
713 {
714  struct dirent *ent;
715  int err;
716 
717  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
718 
719  again:
720  errno = 0;
721  ent = readdir (iter->d);
722 
723  if (!ent)
724  {
725  err = errno;
726 
727  if (err != 0)
728  dbus_set_error (error,
730  "%s", _dbus_strerror (err));
731 
732  return FALSE;
733  }
734  else if (ent->d_name[0] == '.' &&
735  (ent->d_name[1] == '\0' ||
736  (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
737  goto again;
738  else
739  {
740  _dbus_string_set_length (filename, 0);
741  if (!_dbus_string_append (filename, ent->d_name))
742  {
744  "No memory to read directory entry");
745  return FALSE;
746  }
747  else
748  {
749  return TRUE;
750  }
751  }
752 }
753 
757 void
759 {
760  closedir (iter->d);
761  dbus_free (iter);
762 }
763 
764 static dbus_bool_t
765 fill_user_info_from_group (struct group *g,
766  DBusGroupInfo *info,
767  DBusError *error)
768 {
769  _dbus_assert (g->gr_name != NULL);
770 
771  info->gid = g->gr_gid;
772  info->groupname = _dbus_strdup (g->gr_name);
773 
774  /* info->members = dbus_strdupv (g->gr_mem) */
775 
776  if (info->groupname == NULL)
777  {
779  return FALSE;
780  }
781 
782  return TRUE;
783 }
784 
785 static dbus_bool_t
786 fill_group_info (DBusGroupInfo *info,
787  dbus_gid_t gid,
788  const DBusString *groupname,
789  DBusError *error)
790 {
791  const char *group_c_str;
792 
793  _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
794  _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
795 
796  if (groupname)
797  group_c_str = _dbus_string_get_const_data (groupname);
798  else
799  group_c_str = NULL;
800 
801  /* For now assuming that the getgrnam() and getgrgid() flavors
802  * always correspond to the pwnam flavors, if not we have
803  * to add more configure checks.
804  */
805 
806 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
807  {
808  struct group *g;
809  int result;
810  size_t buflen;
811  char *buf;
812  struct group g_str;
813  dbus_bool_t b;
814 
815  /* retrieve maximum needed size for buf */
816  buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
817 
818  /* sysconf actually returns a long, but everything else expects size_t,
819  * so just recast here.
820  * https://bugs.freedesktop.org/show_bug.cgi?id=17061
821  */
822  if ((long) buflen <= 0)
823  buflen = 1024;
824 
825  result = -1;
826  while (1)
827  {
828  buf = dbus_malloc (buflen);
829  if (buf == NULL)
830  {
832  return FALSE;
833  }
834 
835  g = NULL;
836 #ifdef HAVE_POSIX_GETPWNAM_R
837  if (group_c_str)
838  result = getgrnam_r (group_c_str, &g_str, buf, buflen,
839  &g);
840  else
841  result = getgrgid_r (gid, &g_str, buf, buflen,
842  &g);
843 #else
844  g = getgrnam_r (group_c_str, &g_str, buf, buflen);
845  result = 0;
846 #endif /* !HAVE_POSIX_GETPWNAM_R */
847  /* Try a bigger buffer if ERANGE was returned:
848  https://bugs.freedesktop.org/show_bug.cgi?id=16727
849  */
850  if (result == ERANGE && buflen < 512 * 1024)
851  {
852  dbus_free (buf);
853  buflen *= 2;
854  }
855  else
856  {
857  break;
858  }
859  }
860 
861  if (result == 0 && g == &g_str)
862  {
863  b = fill_user_info_from_group (g, info, error);
864  dbus_free (buf);
865  return b;
866  }
867  else
868  {
869  dbus_set_error (error, _dbus_error_from_errno (errno),
870  "Group %s unknown or failed to look it up\n",
871  group_c_str ? group_c_str : "???");
872  dbus_free (buf);
873  return FALSE;
874  }
875  }
876 #else /* ! HAVE_GETPWNAM_R */
877  {
878  /* I guess we're screwed on thread safety here */
879  struct group *g;
880 
881  g = getgrnam (group_c_str);
882 
883  if (g != NULL)
884  {
885  return fill_user_info_from_group (g, info, error);
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  return FALSE;
893  }
894  }
895 #endif /* ! HAVE_GETPWNAM_R */
896 }
897 
909  const DBusString *groupname,
910  DBusError *error)
911 {
912  return fill_group_info (info, DBUS_GID_UNSET,
913  groupname, error);
914 
915 }
916 
928  dbus_gid_t gid,
929  DBusError *error)
930 {
931  return fill_group_info (info, gid, NULL, error);
932 }
933 
944  dbus_uid_t *uid_p)
945 {
946  return _dbus_get_user_id (username, uid_p);
947 
948 }
949 
960  dbus_gid_t *gid_p)
961 {
962  return _dbus_get_group_id (groupname, gid_p);
963 }
964 
977  dbus_gid_t **group_ids,
978  int *n_group_ids)
979 {
980  return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
981 }
982 
994  DBusError *error)
995 {
996  return _dbus_is_console_user (uid, error);
997 
998 }
999 
1009 {
1010  return uid == _dbus_geteuid ();
1011 }
1012 
1021 _dbus_windows_user_is_process_owner (const char *windows_sid)
1022 {
1023  return FALSE;
1024 }
1025  /* End of DBusInternalsUtils functions */
1027 
1041  DBusString *dirname)
1042 {
1043  int sep;
1044 
1045  _dbus_assert (filename != dirname);
1046  _dbus_assert (filename != NULL);
1047  _dbus_assert (dirname != NULL);
1048 
1049  /* Ignore any separators on the end */
1050  sep = _dbus_string_get_length (filename);
1051  if (sep == 0)
1052  return _dbus_string_append (dirname, "."); /* empty string passed in */
1053 
1054  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1055  --sep;
1056 
1057  _dbus_assert (sep >= 0);
1058 
1059  if (sep == 0)
1060  return _dbus_string_append (dirname, "/");
1061 
1062  /* Now find the previous separator */
1063  _dbus_string_find_byte_backward (filename, sep, '/', &sep);
1064  if (sep < 0)
1065  return _dbus_string_append (dirname, ".");
1066 
1067  /* skip multiple separators */
1068  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1069  --sep;
1070 
1071  _dbus_assert (sep >= 0);
1072 
1073  if (sep == 0 &&
1074  _dbus_string_get_byte (filename, 0) == '/')
1075  return _dbus_string_append (dirname, "/");
1076  else
1077  return _dbus_string_copy_len (filename, 0, sep - 0,
1078  dirname, _dbus_string_get_length (dirname));
1079 } /* DBusString stuff */
1081 
1082 static void
1083 string_squash_nonprintable (DBusString *str)
1084 {
1085  unsigned char *buf;
1086  int i, len;
1087 
1088  buf = _dbus_string_get_data (str);
1089  len = _dbus_string_get_length (str);
1090 
1091  for (i = 0; i < len; i++)
1092  {
1093  unsigned char c = (unsigned char) buf[i];
1094  if (c == '\0')
1095  buf[i] = ' ';
1096  else if (c < 0x20 || c > 127)
1097  buf[i] = '?';
1098  }
1099 }
1100 
1115 dbus_bool_t
1116 _dbus_command_for_pid (unsigned long pid,
1117  DBusString *str,
1118  int max_len,
1119  DBusError *error)
1120 {
1121  /* This is all Linux-specific for now */
1122  DBusString path;
1123  DBusString cmdline;
1124  int fd;
1125 
1126  if (!_dbus_string_init (&path))
1127  {
1128  _DBUS_SET_OOM (error);
1129  return FALSE;
1130  }
1131 
1132  if (!_dbus_string_init (&cmdline))
1133  {
1134  _DBUS_SET_OOM (error);
1135  _dbus_string_free (&path);
1136  return FALSE;
1137  }
1138 
1139  if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
1140  goto oom;
1141 
1142  fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1143  if (fd < 0)
1144  {
1145  dbus_set_error (error,
1146  _dbus_error_from_errno (errno),
1147  "Failed to open \"%s\": %s",
1149  _dbus_strerror (errno));
1150  goto fail;
1151  }
1152 
1153  if (!_dbus_read (fd, &cmdline, max_len))
1154  {
1155  dbus_set_error (error,
1156  _dbus_error_from_errno (errno),
1157  "Failed to read from \"%s\": %s",
1159  _dbus_strerror (errno));
1160  _dbus_close (fd, NULL);
1161  goto fail;
1162  }
1163 
1164  if (!_dbus_close (fd, error))
1165  goto fail;
1166 
1167  string_squash_nonprintable (&cmdline);
1168 
1169  if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
1170  goto oom;
1171 
1172  _dbus_string_free (&cmdline);
1173  _dbus_string_free (&path);
1174  return TRUE;
1175 oom:
1176  _DBUS_SET_OOM (error);
1177 fail:
1178  _dbus_string_free (&cmdline);
1179  _dbus_string_free (&path);
1180  return FALSE;
1181 }
1182 
1183 /*
1184  * replaces the term DBUS_PREFIX in configure_time_path by the
1185  * current dbus installation directory. On unix this function is a noop
1186  *
1187  * @param configure_time_path
1188  * @return real path
1189  */
1190 const char *
1191 _dbus_replace_install_prefix (const char *configure_time_path)
1192 {
1193  return configure_time_path;
1194 }
1195 
1196 #define DBUS_UNIX_STANDARD_SESSION_SERVICEDIR "/dbus-1/services"
1197 #define DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR "/dbus-1/system-services"
1198 
1218 {
1219  const char *xdg_data_home;
1220  const char *xdg_data_dirs;
1221  DBusString servicedir_path;
1222 
1223  if (!_dbus_string_init (&servicedir_path))
1224  return FALSE;
1225 
1226  xdg_data_home = _dbus_getenv ("XDG_DATA_HOME");
1227  xdg_data_dirs = _dbus_getenv ("XDG_DATA_DIRS");
1228 
1229  if (xdg_data_home != NULL)
1230  {
1231  if (!_dbus_string_append (&servicedir_path, xdg_data_home))
1232  goto oom;
1233  }
1234  else
1235  {
1236  const DBusString *homedir;
1237  DBusString local_share;
1238 
1239  if (!_dbus_homedir_from_current_process (&homedir))
1240  goto oom;
1241 
1242  if (!_dbus_string_append (&servicedir_path, _dbus_string_get_const_data (homedir)))
1243  goto oom;
1244 
1245  _dbus_string_init_const (&local_share, "/.local/share");
1246  if (!_dbus_concat_dir_and_file (&servicedir_path, &local_share))
1247  goto oom;
1248  }
1249 
1250  if (!_dbus_string_append (&servicedir_path, ":"))
1251  goto oom;
1252 
1253  if (xdg_data_dirs != NULL)
1254  {
1255  if (!_dbus_string_append (&servicedir_path, xdg_data_dirs))
1256  goto oom;
1257 
1258  if (!_dbus_string_append (&servicedir_path, ":"))
1259  goto oom;
1260  }
1261  else
1262  {
1263  if (!_dbus_string_append (&servicedir_path, "/usr/local/share:/usr/share:"))
1264  goto oom;
1265  }
1266 
1267  /*
1268  * add configured datadir to defaults
1269  * this may be the same as an xdg dir
1270  * however the config parser should take
1271  * care of duplicates
1272  */
1273  if (!_dbus_string_append (&servicedir_path, DBUS_DATADIR))
1274  goto oom;
1275 
1276  if (!_dbus_split_paths_and_append (&servicedir_path,
1277  DBUS_UNIX_STANDARD_SESSION_SERVICEDIR,
1278  dirs))
1279  goto oom;
1280 
1281  _dbus_string_free (&servicedir_path);
1282  return TRUE;
1283 
1284  oom:
1285  _dbus_string_free (&servicedir_path);
1286  return FALSE;
1287 }
1288 
1289 
1310 {
1311  /*
1312  * DBUS_DATADIR may be the same as one of the standard directories. However,
1313  * the config parser should take care of the duplicates.
1314  *
1315  * Also, append /lib as counterpart of /usr/share on the root
1316  * directory (the root directory does not know /share), in order to
1317  * facilitate early boot system bus activation where /usr might not
1318  * be available.
1319  */
1320  static const char standard_search_path[] =
1321  "/usr/local/share:"
1322  "/usr/share:"
1323  DBUS_DATADIR ":"
1324  "/lib";
1325  DBusString servicedir_path;
1326 
1327  _dbus_string_init_const (&servicedir_path, standard_search_path);
1328 
1329  return _dbus_split_paths_and_append (&servicedir_path,
1330  DBUS_UNIX_STANDARD_SYSTEM_SERVICEDIR,
1331  dirs);
1332 }
1333 
1344 {
1345  return _dbus_string_append (str, DBUS_SYSTEM_CONFIG_FILE);
1346 }
1347 
1356 {
1357  return _dbus_string_append (str, DBUS_SESSION_CONFIG_FILE);
1358 }
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:918
const char * message
public error message field
Definition: dbus-errors.h:51
#define NULL
A null pointer, defined appropriately for C or C++.
dbus_bool_t _dbus_append_system_config_file(DBusString *str)
Append the absolute path of the system.conf file (there is no system bus on Windows so this can just ...
dbus_bool_t _dbus_become_daemon(const DBusString *pidfile, DBusPipe *print_pid_pipe, DBusError *error, dbus_bool_t keep_umask)
Does the chdir, fork, setsid, etc.
dbus_bool_t _dbus_unix_user_is_at_console(dbus_uid_t uid, DBusError *error)
Checks to see if the UNIX user ID is at the console.
dbus_bool_t _dbus_group_info_fill_gid(DBusGroupInfo *info, dbus_gid_t gid, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group ID...
dbus_bool_t _dbus_string_get_dirname(const DBusString *filename, DBusString *dirname)
Get the directory name from a complete filename.
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:701
dbus_bool_t _dbus_path_is_absolute(const DBusString *filename)
Checks whether the filename is an absolute path.
void _dbus_system_log(DBusSystemLogSeverity severity, const char *msg,...)
Log a message to the system log file (e.g.
Portable struct with stat() results.
Definition: dbus-sysdeps.h:401
dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString.
Definition: dbus-sysdeps.c:354
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.
#define DBUS_PID_FORMAT
an appropriate printf format for dbus_pid_t
Definition: dbus-sysdeps.h:110
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.
void _dbus_directory_close(DBusDirIter *iter)
Closes a directory iteration.
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.
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
dbus_bool_t _dbus_directory_get_next_file(DBusDirIter *iter, DBusString *filename, DBusError *error)
Get next file in the directory.
unsigned long atime
Access time.
Definition: dbus-sysdeps.h:408
dbus_bool_t _dbus_get_standard_session_servicedirs(DBusList **dirs)
Returns the standard directories for a session bus to look for service activation files...
unsigned char _dbus_string_get_byte(const DBusString *str, int start)
Gets the byte at the given position.
Definition: dbus-string.c:545
DBusDirIter * _dbus_directory_open(const DBusString *filename, DBusError *error)
Open a directory to iterate over.
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
dbus_pid_t _dbus_getpid(void)
Gets our process ID.
dbus_bool_t _dbus_command_for_pid(unsigned long pid, DBusString *str, int max_len, DBusError *error)
Get a printable string describing the command used to execute the process with pid.
dbus_bool_t _dbus_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:1265
char * groupname
Group name.
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:185
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:614
Internals of directory iterator.
unsigned long mode
File mode.
Definition: dbus-sysdeps.h:403
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:96
dbus_bool_t _dbus_get_user_id_and_primary_group(const DBusString *username, dbus_uid_t *uid_p, dbus_gid_t *gid_p)
Gets user ID and primary group given username.
dbus_bool_t _dbus_change_to_daemon_user(const char *user, DBusError *error)
Changes the user and group the bus is running as.
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition: dbus-memory.c:461
dbus_gid_t gid
Group owning file.
Definition: dbus-sysdeps.h:406
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition: dbus-string.c:190
char * _dbus_string_get_data(DBusString *str)
Gets the raw character buffer from the string.
Definition: dbus-string.c:434
DIR * d
The DIR* from opendir()
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
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:1096
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...
int _dbus_string_get_length(const DBusString *str)
Gets the length of a string (not including nul termination).
Definition: dbus-string.c:722
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Definition: dbus-sysdeps.h:443
dbus_bool_t _dbus_get_group_id(const DBusString *groupname, dbus_gid_t *gid)
Gets group ID given groupname.
Object representing an exception.
Definition: dbus-errors.h:48
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
Definition: dbus-errors.c:354
dbus_bool_t _dbus_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.
unsigned long ctime
Creation time.
Definition: dbus-sysdeps.h:410
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:242
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition: dbus-sysdeps.h:107
dbus_bool_t _dbus_file_exists(const char *file)
Checks if a file exists.
#define TRUE
Expands to "1".
unsigned long nlink
Number of hard links.
Definition: dbus-sysdeps.h:404
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
dbus_bool_t _dbus_write_pid_to_file_and_pipe(const DBusString *pidfile, DBusPipe *print_pid_pipe, dbus_pid_t pid_to_write, DBusError *error)
Writes the given pid_to_write to a pidfile (if non-NULL) and/or to a pipe (if non-NULL).
dbus_uid_t uid
User owning file.
Definition: dbus-sysdeps.h:405
void _dbus_system_logv(DBusSystemLogSeverity severity, const char *msg, va_list args)
Log a message to the system log file (e.g.
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
dbus_bool_t _dbus_verify_daemon_user(const char *user)
Verify that after the fork we can successfully change to this user.
dbus_bool_t _dbus_string_find_byte_backward(const DBusString *str, int start, unsigned char byte, int *found)
Find the given byte scanning backward from the given start.
dbus_bool_t _dbus_homedir_from_current_process(const DBusString **homedir)
Gets homedir of user owning current process.
Definition: dbus-userdb.c:395
Information about a UNIX group.
dbus_bool_t _dbus_stat(const DBusString *filename, DBusStat *statbuf, DBusError *error)
stat() wrapper.
dbus_bool_t _dbus_get_user_id(const DBusString *username, dbus_uid_t *uid)
Gets user ID given username.
void _dbus_set_signal_handler(int sig, DBusSignalHandler handler)
Installs a UNIX signal handler.
A node in a linked list.
Definition: dbus-list.h:34
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:226
dbus_bool_t _dbus_unix_user_is_process_owner(dbus_uid_t uid)
Checks to see if the UNIX user ID matches the UID of the process.
dbus_bool_t _dbus_user_at_console(const char *username, DBusError *error)
Checks if user is at the console.
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.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
#define FALSE
Expands to "0".
unsigned long mtime
Modify time.
Definition: dbus-sysdeps.h:409
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:785
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:1357
dbus_gid_t gid
GID.
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
unsigned long dbus_gid_t
A group ID.
Definition: dbus-sysdeps.h:100
unsigned long size
Size of file.
Definition: dbus-sysdeps.h:407
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.
char * _dbus_strdup(const char *str)
Duplicates a string.
dbus_bool_t _dbus_append_session_config_file(DBusString *str)
Append the absolute path of the session.conf file.
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:98
const char * _dbus_string_get_const_data(const DBusString *str)
Gets the raw character buffer from a const string.
Definition: dbus-string.c:451
void _dbus_request_file_descriptor_limit(unsigned int limit)
Attempt to ensure that the current process can open at least limit file descriptors.
dbus_bool_t _dbus_get_standard_system_servicedirs(DBusList **dirs)
Returns the standard directories for a system bus to look for service activation files.
int _dbus_read(int fd, DBusString *buffer, int count)
Thin wrapper around the read() system call that appends the data it reads to the DBusString buffer...
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition: dbus-errors.c:329