D-Bus  1.6.12
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 #include <syslog.h>
53 
54 #ifdef HAVE_SYS_SYSLIMITS_H
55 #include <sys/syslimits.h>
56 #endif
57 
58 #ifndef O_BINARY
59 #define O_BINARY 0
60 #endif
61 
79  DBusPipe *print_pid_pipe,
80  DBusError *error,
81  dbus_bool_t keep_umask)
82 {
83  const char *s;
84  pid_t child_pid;
85  int dev_null_fd;
86 
87  _dbus_verbose ("Becoming a daemon...\n");
88 
89  _dbus_verbose ("chdir to /\n");
90  if (chdir ("/") < 0)
91  {
93  "Could not chdir() to root directory");
94  return FALSE;
95  }
96 
97  _dbus_verbose ("forking...\n");
98  switch ((child_pid = fork ()))
99  {
100  case -1:
101  _dbus_verbose ("fork failed\n");
102  dbus_set_error (error, _dbus_error_from_errno (errno),
103  "Failed to fork daemon: %s", _dbus_strerror (errno));
104  return FALSE;
105  break;
106 
107  case 0:
108  _dbus_verbose ("in child, closing std file descriptors\n");
109 
110  /* silently ignore failures here, if someone
111  * doesn't have /dev/null we may as well try
112  * to continue anyhow
113  */
114 
115  dev_null_fd = open ("/dev/null", O_RDWR);
116  if (dev_null_fd >= 0)
117  {
118  dup2 (dev_null_fd, 0);
119  dup2 (dev_null_fd, 1);
120 
121  s = _dbus_getenv ("DBUS_DEBUG_OUTPUT");
122  if (s == NULL || *s == '\0')
123  dup2 (dev_null_fd, 2);
124  else
125  _dbus_verbose ("keeping stderr open due to DBUS_DEBUG_OUTPUT\n");
126  close (dev_null_fd);
127  }
128 
129  if (!keep_umask)
130  {
131  /* Get a predictable umask */
132  _dbus_verbose ("setting umask\n");
133  umask (022);
134  }
135 
136  _dbus_verbose ("calling setsid()\n");
137  if (setsid () == -1)
138  _dbus_assert_not_reached ("setsid() failed");
139 
140  break;
141 
142  default:
143  if (!_dbus_write_pid_to_file_and_pipe (pidfile, print_pid_pipe,
144  child_pid, error))
145  {
146  _dbus_verbose ("pid file or pipe write failed: %s\n",
147  error->message);
148  kill (child_pid, SIGTERM);
149  return FALSE;
150  }
151 
152  _dbus_verbose ("parent exiting\n");
153  _exit (0);
154  break;
155  }
156 
157  return TRUE;
158 }
159 
160 
169 static dbus_bool_t
170 _dbus_write_pid_file (const DBusString *filename,
171  unsigned long pid,
172  DBusError *error)
173 {
174  const char *cfilename;
175  int fd;
176  FILE *f;
177 
178  cfilename = _dbus_string_get_const_data (filename);
179 
180  fd = open (cfilename, O_WRONLY|O_CREAT|O_EXCL|O_BINARY, 0644);
181 
182  if (fd < 0)
183  {
184  dbus_set_error (error, _dbus_error_from_errno (errno),
185  "Failed to open \"%s\": %s", cfilename,
186  _dbus_strerror (errno));
187  return FALSE;
188  }
189 
190  if ((f = fdopen (fd, "w")) == NULL)
191  {
192  dbus_set_error (error, _dbus_error_from_errno (errno),
193  "Failed to fdopen fd %d: %s", fd, _dbus_strerror (errno));
194  _dbus_close (fd, NULL);
195  return FALSE;
196  }
197 
198  if (fprintf (f, "%lu\n", pid) < 0)
199  {
200  dbus_set_error (error, _dbus_error_from_errno (errno),
201  "Failed to write to \"%s\": %s", cfilename,
202  _dbus_strerror (errno));
203 
204  fclose (f);
205  return FALSE;
206  }
207 
208  if (fclose (f) == EOF)
209  {
210  dbus_set_error (error, _dbus_error_from_errno (errno),
211  "Failed to close \"%s\": %s", cfilename,
212  _dbus_strerror (errno));
213  return FALSE;
214  }
215 
216  return TRUE;
217 }
218 
232  DBusPipe *print_pid_pipe,
233  dbus_pid_t pid_to_write,
234  DBusError *error)
235 {
236  if (pidfile)
237  {
238  _dbus_verbose ("writing pid file %s\n", _dbus_string_get_const_data (pidfile));
239  if (!_dbus_write_pid_file (pidfile,
240  pid_to_write,
241  error))
242  {
243  _dbus_verbose ("pid file write failed\n");
244  _DBUS_ASSERT_ERROR_IS_SET(error);
245  return FALSE;
246  }
247  }
248  else
249  {
250  _dbus_verbose ("No pid file requested\n");
251  }
252 
253  if (print_pid_pipe != NULL && _dbus_pipe_is_valid (print_pid_pipe))
254  {
255  DBusString pid;
256  int bytes;
257 
258  _dbus_verbose ("writing our pid to pipe %d\n",
259  print_pid_pipe->fd);
260 
261  if (!_dbus_string_init (&pid))
262  {
263  _DBUS_SET_OOM (error);
264  return FALSE;
265  }
266 
267  if (!_dbus_string_append_int (&pid, pid_to_write) ||
268  !_dbus_string_append (&pid, "\n"))
269  {
270  _dbus_string_free (&pid);
271  _DBUS_SET_OOM (error);
272  return FALSE;
273  }
274 
275  bytes = _dbus_string_get_length (&pid);
276  if (_dbus_pipe_write (print_pid_pipe, &pid, 0, bytes, error) != bytes)
277  {
278  /* _dbus_pipe_write sets error only on failure, not short write */
279  if (error != NULL && !dbus_error_is_set(error))
280  {
282  "Printing message bus PID: did not write enough bytes\n");
283  }
284  _dbus_string_free (&pid);
285  return FALSE;
286  }
287 
288  _dbus_string_free (&pid);
289  }
290  else
291  {
292  _dbus_verbose ("No pid pipe to write to\n");
293  }
294 
295  return TRUE;
296 }
297 
305 _dbus_verify_daemon_user (const char *user)
306 {
307  DBusString u;
308 
309  _dbus_string_init_const (&u, user);
310 
312 }
313 
314 
315 /* The HAVE_LIBAUDIT case lives in selinux.c */
316 #ifndef HAVE_LIBAUDIT
317 
325 _dbus_change_to_daemon_user (const char *user,
326  DBusError *error)
327 {
328  dbus_uid_t uid;
329  dbus_gid_t gid;
330  DBusString u;
331 
332  _dbus_string_init_const (&u, user);
333 
334  if (!_dbus_get_user_id_and_primary_group (&u, &uid, &gid))
335  {
337  "User '%s' does not appear to exist?",
338  user);
339  return FALSE;
340  }
341 
342  /* setgroups() only works if we are a privileged process,
343  * so we don't return error on failure; the only possible
344  * failure is that we don't have perms to do it.
345  *
346  * not sure this is right, maybe if setuid()
347  * is going to work then setgroups() should also work.
348  */
349  if (setgroups (0, NULL) < 0)
350  _dbus_warn ("Failed to drop supplementary groups: %s\n",
351  _dbus_strerror (errno));
352 
353  /* Set GID first, or the setuid may remove our permission
354  * to change the GID
355  */
356  if (setgid (gid) < 0)
357  {
358  dbus_set_error (error, _dbus_error_from_errno (errno),
359  "Failed to set GID to %lu: %s", gid,
360  _dbus_strerror (errno));
361  return FALSE;
362  }
363 
364  if (setuid (uid) < 0)
365  {
366  dbus_set_error (error, _dbus_error_from_errno (errno),
367  "Failed to set UID to %lu: %s", uid,
368  _dbus_strerror (errno));
369  return FALSE;
370  }
371 
372  return TRUE;
373 }
374 #endif /* !HAVE_LIBAUDIT */
375 
376 
387 void
389 {
390 #ifdef HAVE_SETRLIMIT
391  struct rlimit lim;
392  struct rlimit target_lim;
393 
394  /* No point to doing this practically speaking
395  * if we're not uid 0. We expect the system
396  * bus to use this before we change UID, and
397  * the session bus takes the Linux default
398  * of 1024 for both cur and max.
399  */
400  if (getuid () != 0)
401  return;
402 
403  if (getrlimit (RLIMIT_NOFILE, &lim) < 0)
404  return;
405 
406  if (lim.rlim_cur >= limit)
407  return;
408 
409  /* Ignore "maximum limit", assume we have the "superuser"
410  * privileges. On Linux this is CAP_SYS_RESOURCE.
411  */
412  target_lim.rlim_cur = target_lim.rlim_max = limit;
413  /* Also ignore errors; if we fail, we will at least work
414  * up to whatever limit we had, which seems better than
415  * just outright aborting.
416  *
417  * However, in the future we should probably log this so OS builders
418  * have a chance to notice any misconfiguration like dbus-daemon
419  * being started without CAP_SYS_RESOURCE.
420  */
421  setrlimit (RLIMIT_NOFILE, &target_lim);
422 #endif
423 }
424 
425 void
426 _dbus_init_system_log (void)
427 {
428 #if HAVE_DECL_LOG_PERROR
429  openlog ("dbus", LOG_PID | LOG_PERROR, LOG_DAEMON);
430 #else
431  openlog ("dbus", LOG_PID, LOG_DAEMON);
432 #endif
433 }
434 
443 void
444 _dbus_system_log (DBusSystemLogSeverity severity, const char *msg, ...)
445 {
446  va_list args;
447 
448  va_start (args, msg);
449 
450  _dbus_system_logv (severity, msg, args);
451 
452  va_end (args);
453 }
454 
465 void
466 _dbus_system_logv (DBusSystemLogSeverity severity, const char *msg, va_list args)
467 {
468  int flags;
469  switch (severity)
470  {
471  case DBUS_SYSTEM_LOG_INFO:
472  flags = LOG_DAEMON | LOG_NOTICE;
473  break;
474  case DBUS_SYSTEM_LOG_SECURITY:
475  flags = LOG_AUTH | LOG_NOTICE;
476  break;
477  case DBUS_SYSTEM_LOG_FATAL:
478  flags = LOG_DAEMON|LOG_CRIT;
479  break;
480  default:
481  return;
482  }
483 
484 #ifndef HAVE_DECL_LOG_PERROR
485  {
486  /* vsyslog() won't write to stderr, so we'd better do it */
487  va_list tmp;
488 
489  DBUS_VA_COPY (tmp, args);
490  fprintf (stderr, "dbus[" DBUS_PID_FORMAT "]: ", _dbus_getpid ());
491  vfprintf (stderr, msg, tmp);
492  fputc ('\n', stderr);
493  va_end (tmp);
494  }
495 #endif
496 
497  vsyslog (flags, msg, args);
498 
499  if (severity == DBUS_SYSTEM_LOG_FATAL)
500  exit (1);
501 }
502 
508 void
510  DBusSignalHandler handler)
511 {
512  struct sigaction act;
513  sigset_t empty_mask;
514 
515  sigemptyset (&empty_mask);
516  act.sa_handler = handler;
517  act.sa_mask = empty_mask;
518  act.sa_flags = 0;
519  sigaction (sig, &act, NULL);
520 }
521 
528 _dbus_file_exists (const char *file)
529 {
530  return (access (file, F_OK) == 0);
531 }
532 
540 _dbus_user_at_console (const char *username,
541  DBusError *error)
542 {
543 
544  DBusString u, f;
545  dbus_bool_t result;
546 
547  result = FALSE;
548  if (!_dbus_string_init (&f))
549  {
550  _DBUS_SET_OOM (error);
551  return FALSE;
552  }
553 
554  if (!_dbus_string_append (&f, DBUS_CONSOLE_AUTH_DIR))
555  {
556  _DBUS_SET_OOM (error);
557  goto out;
558  }
559 
560  _dbus_string_init_const (&u, username);
561 
562  if (!_dbus_concat_dir_and_file (&f, &u))
563  {
564  _DBUS_SET_OOM (error);
565  goto out;
566  }
567 
569 
570  out:
571  _dbus_string_free (&f);
572 
573  return result;
574 }
575 
576 
585 {
586  if (_dbus_string_get_length (filename) > 0)
587  return _dbus_string_get_byte (filename, 0) == '/';
588  else
589  return FALSE;
590 }
591 
601 _dbus_stat (const DBusString *filename,
602  DBusStat *statbuf,
603  DBusError *error)
604 {
605  const char *filename_c;
606  struct stat sb;
607 
608  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
609 
610  filename_c = _dbus_string_get_const_data (filename);
611 
612  if (stat (filename_c, &sb) < 0)
613  {
614  dbus_set_error (error, _dbus_error_from_errno (errno),
615  "%s", _dbus_strerror (errno));
616  return FALSE;
617  }
618 
619  statbuf->mode = sb.st_mode;
620  statbuf->nlink = sb.st_nlink;
621  statbuf->uid = sb.st_uid;
622  statbuf->gid = sb.st_gid;
623  statbuf->size = sb.st_size;
624  statbuf->atime = sb.st_atime;
625  statbuf->mtime = sb.st_mtime;
626  statbuf->ctime = sb.st_ctime;
627 
628  return TRUE;
629 }
630 
631 
636 {
637  DIR *d;
639 };
640 
650  DBusError *error)
651 {
652  DIR *d;
653  DBusDirIter *iter;
654  const char *filename_c;
655 
656  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
657 
658  filename_c = _dbus_string_get_const_data (filename);
659 
660  d = opendir (filename_c);
661  if (d == NULL)
662  {
663  dbus_set_error (error, _dbus_error_from_errno (errno),
664  "Failed to read directory \"%s\": %s",
665  filename_c,
666  _dbus_strerror (errno));
667  return NULL;
668  }
669  iter = dbus_new0 (DBusDirIter, 1);
670  if (iter == NULL)
671  {
672  closedir (d);
674  "Could not allocate memory for directory iterator");
675  return NULL;
676  }
677 
678  iter->d = d;
679 
680  return iter;
681 }
682 
698  DBusString *filename,
699  DBusError *error)
700 {
701  struct dirent *ent;
702  int err;
703 
704  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
705 
706  again:
707  errno = 0;
708  ent = readdir (iter->d);
709 
710  if (!ent)
711  {
712  err = errno;
713 
714  if (err != 0)
715  dbus_set_error (error,
717  "%s", _dbus_strerror (err));
718 
719  return FALSE;
720  }
721  else if (ent->d_name[0] == '.' &&
722  (ent->d_name[1] == '\0' ||
723  (ent->d_name[1] == '.' && ent->d_name[2] == '\0')))
724  goto again;
725  else
726  {
727  _dbus_string_set_length (filename, 0);
728  if (!_dbus_string_append (filename, ent->d_name))
729  {
731  "No memory to read directory entry");
732  return FALSE;
733  }
734  else
735  {
736  return TRUE;
737  }
738  }
739 }
740 
744 void
746 {
747  closedir (iter->d);
748  dbus_free (iter);
749 }
750 
751 static dbus_bool_t
752 fill_user_info_from_group (struct group *g,
753  DBusGroupInfo *info,
754  DBusError *error)
755 {
756  _dbus_assert (g->gr_name != NULL);
757 
758  info->gid = g->gr_gid;
759  info->groupname = _dbus_strdup (g->gr_name);
760 
761  /* info->members = dbus_strdupv (g->gr_mem) */
762 
763  if (info->groupname == NULL)
764  {
766  return FALSE;
767  }
768 
769  return TRUE;
770 }
771 
772 static dbus_bool_t
773 fill_group_info (DBusGroupInfo *info,
774  dbus_gid_t gid,
775  const DBusString *groupname,
776  DBusError *error)
777 {
778  const char *group_c_str;
779 
780  _dbus_assert (groupname != NULL || gid != DBUS_GID_UNSET);
781  _dbus_assert (groupname == NULL || gid == DBUS_GID_UNSET);
782 
783  if (groupname)
784  group_c_str = _dbus_string_get_const_data (groupname);
785  else
786  group_c_str = NULL;
787 
788  /* For now assuming that the getgrnam() and getgrgid() flavors
789  * always correspond to the pwnam flavors, if not we have
790  * to add more configure checks.
791  */
792 
793 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
794  {
795  struct group *g;
796  int result;
797  size_t buflen;
798  char *buf;
799  struct group g_str;
800  dbus_bool_t b;
801 
802  /* retrieve maximum needed size for buf */
803  buflen = sysconf (_SC_GETGR_R_SIZE_MAX);
804 
805  /* sysconf actually returns a long, but everything else expects size_t,
806  * so just recast here.
807  * https://bugs.freedesktop.org/show_bug.cgi?id=17061
808  */
809  if ((long) buflen <= 0)
810  buflen = 1024;
811 
812  result = -1;
813  while (1)
814  {
815  buf = dbus_malloc (buflen);
816  if (buf == NULL)
817  {
819  return FALSE;
820  }
821 
822  g = NULL;
823 #ifdef HAVE_POSIX_GETPWNAM_R
824  if (group_c_str)
825  result = getgrnam_r (group_c_str, &g_str, buf, buflen,
826  &g);
827  else
828  result = getgrgid_r (gid, &g_str, buf, buflen,
829  &g);
830 #else
831  g = getgrnam_r (group_c_str, &g_str, buf, buflen);
832  result = 0;
833 #endif /* !HAVE_POSIX_GETPWNAM_R */
834  /* Try a bigger buffer if ERANGE was returned:
835  https://bugs.freedesktop.org/show_bug.cgi?id=16727
836  */
837  if (result == ERANGE && buflen < 512 * 1024)
838  {
839  dbus_free (buf);
840  buflen *= 2;
841  }
842  else
843  {
844  break;
845  }
846  }
847 
848  if (result == 0 && g == &g_str)
849  {
850  b = fill_user_info_from_group (g, info, error);
851  dbus_free (buf);
852  return b;
853  }
854  else
855  {
856  dbus_set_error (error, _dbus_error_from_errno (errno),
857  "Group %s unknown or failed to look it up\n",
858  group_c_str ? group_c_str : "???");
859  dbus_free (buf);
860  return FALSE;
861  }
862  }
863 #else /* ! HAVE_GETPWNAM_R */
864  {
865  /* I guess we're screwed on thread safety here */
866  struct group *g;
867 
868  g = getgrnam (group_c_str);
869 
870  if (g != NULL)
871  {
872  return fill_user_info_from_group (g, info, error);
873  }
874  else
875  {
876  dbus_set_error (error, _dbus_error_from_errno (errno),
877  "Group %s unknown or failed to look it up\n",
878  group_c_str ? group_c_str : "???");
879  return FALSE;
880  }
881  }
882 #endif /* ! HAVE_GETPWNAM_R */
883 }
884 
896  const DBusString *groupname,
897  DBusError *error)
898 {
899  return fill_group_info (info, DBUS_GID_UNSET,
900  groupname, error);
901 
902 }
903 
915  dbus_gid_t gid,
916  DBusError *error)
917 {
918  return fill_group_info (info, gid, NULL, error);
919 }
920 
931  dbus_uid_t *uid_p)
932 {
933  return _dbus_get_user_id (username, uid_p);
934 
935 }
936 
947  dbus_gid_t *gid_p)
948 {
949  return _dbus_get_group_id (groupname, gid_p);
950 }
951 
964  dbus_gid_t **group_ids,
965  int *n_group_ids)
966 {
967  return _dbus_groups_from_uid (uid, group_ids, n_group_ids);
968 }
969 
981  DBusError *error)
982 {
983  return _dbus_is_console_user (uid, error);
984 
985 }
986 
996 {
997  return uid == _dbus_geteuid ();
998 }
999 
1008 _dbus_windows_user_is_process_owner (const char *windows_sid)
1009 {
1010  return FALSE;
1011 }
1012  /* End of DBusInternalsUtils functions */
1014 
1028  DBusString *dirname)
1029 {
1030  int sep;
1031 
1032  _dbus_assert (filename != dirname);
1033  _dbus_assert (filename != NULL);
1034  _dbus_assert (dirname != NULL);
1035 
1036  /* Ignore any separators on the end */
1037  sep = _dbus_string_get_length (filename);
1038  if (sep == 0)
1039  return _dbus_string_append (dirname, "."); /* empty string passed in */
1040 
1041  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1042  --sep;
1043 
1044  _dbus_assert (sep >= 0);
1045 
1046  if (sep == 0)
1047  return _dbus_string_append (dirname, "/");
1048 
1049  /* Now find the previous separator */
1050  _dbus_string_find_byte_backward (filename, sep, '/', &sep);
1051  if (sep < 0)
1052  return _dbus_string_append (dirname, ".");
1053 
1054  /* skip multiple separators */
1055  while (sep > 0 && _dbus_string_get_byte (filename, sep - 1) == '/')
1056  --sep;
1057 
1058  _dbus_assert (sep >= 0);
1059 
1060  if (sep == 0 &&
1061  _dbus_string_get_byte (filename, 0) == '/')
1062  return _dbus_string_append (dirname, "/");
1063  else
1064  return _dbus_string_copy_len (filename, 0, sep - 0,
1065  dirname, _dbus_string_get_length (dirname));
1066 } /* DBusString stuff */
1068 
1069 static void
1070 string_squash_nonprintable (DBusString *str)
1071 {
1072  unsigned char *buf;
1073  int i, len;
1074 
1075  buf = _dbus_string_get_data (str);
1076  len = _dbus_string_get_length (str);
1077 
1078  for (i = 0; i < len; i++)
1079  {
1080  unsigned char c = (unsigned char) buf[i];
1081  if (c == '\0')
1082  buf[i] = ' ';
1083  else if (c < 0x20 || c > 127)
1084  buf[i] = '?';
1085  }
1086 }
1087 
1102 dbus_bool_t
1103 _dbus_command_for_pid (unsigned long pid,
1104  DBusString *str,
1105  int max_len,
1106  DBusError *error)
1107 {
1108  /* This is all Linux-specific for now */
1109  DBusString path;
1110  DBusString cmdline;
1111  int fd;
1112 
1113  if (!_dbus_string_init (&path))
1114  {
1115  _DBUS_SET_OOM (error);
1116  return FALSE;
1117  }
1118 
1119  if (!_dbus_string_init (&cmdline))
1120  {
1121  _DBUS_SET_OOM (error);
1122  _dbus_string_free (&path);
1123  return FALSE;
1124  }
1125 
1126  if (!_dbus_string_append_printf (&path, "/proc/%ld/cmdline", pid))
1127  goto oom;
1128 
1129  fd = open (_dbus_string_get_const_data (&path), O_RDONLY);
1130  if (fd < 0)
1131  {
1132  dbus_set_error (error,
1133  _dbus_error_from_errno (errno),
1134  "Failed to open \"%s\": %s",
1136  _dbus_strerror (errno));
1137  goto fail;
1138  }
1139 
1140  if (!_dbus_read (fd, &cmdline, max_len))
1141  {
1142  dbus_set_error (error,
1143  _dbus_error_from_errno (errno),
1144  "Failed to read from \"%s\": %s",
1146  _dbus_strerror (errno));
1147  goto fail;
1148  }
1149 
1150  if (!_dbus_close (fd, error))
1151  goto fail;
1152 
1153  string_squash_nonprintable (&cmdline);
1154 
1155  if (!_dbus_string_copy (&cmdline, 0, str, _dbus_string_get_length (str)))
1156  goto oom;
1157 
1158  _dbus_string_free (&cmdline);
1159  _dbus_string_free (&path);
1160  return TRUE;
1161 oom:
1162  _DBUS_SET_OOM (error);
1163 fail:
1164  _dbus_string_free (&cmdline);
1165  _dbus_string_free (&path);
1166  return FALSE;
1167 }
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:913
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_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_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:700
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:390
dbus_bool_t _dbus_string_append_int(DBusString *str, long value)
Appends an integer to a DBusString.
Definition: dbus-sysdeps.c:352
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:112
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:397
unsigned char _dbus_string_get_byte(const DBusString *str, int start)
Gets the byte at the given position.
Definition: dbus-string.c:540
dbus_bool_t _dbus_file_exists(const char *file)
File interface.
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&#39;s copied to the d...
Definition: dbus-string.c:1280
char * groupname
Group name.
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:183
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:612
Internals of directory iterator.
unsigned long mode
File mode.
Definition: dbus-sysdeps.h:392
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:98
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:460
dbus_gid_t gid
Group owning file.
Definition: dbus-sysdeps.h:395
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:429
DIR * d
The DIR* from opendir()
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
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_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition: dbus-string.c:1111
int _dbus_string_get_length(const DBusString *str)
Gets the length of a string (not including nul termination).
Definition: dbus-string.c:717
void(* DBusSignalHandler)(int sig)
A UNIX signal handler.
Definition: dbus-sysdeps.h:432
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:399
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:109
#define TRUE
Expands to &quot;1&quot;.
unsigned long nlink
Number of hard links.
Definition: dbus-sysdeps.h:393
#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_bool_t _dbus_group_info_fill(DBusGroupInfo *info, const DBusString *groupname, DBusError *error)
Initializes the given DBusGroupInfo struct with information about the given group name...
dbus_uid_t uid
User owning file.
Definition: dbus-sysdeps.h:394
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; &quot;something went wrong&quot; - 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.
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.
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 &quot;0&quot;.
unsigned long mtime
Modify time.
Definition: dbus-sysdeps.h:398
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:780
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:1372
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:102
unsigned long size
Size of file.
Definition: dbus-sysdeps.h:396
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.
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:100
const char * _dbus_string_get_const_data(const DBusString *str)
Gets the raw character buffer from a const string.
Definition: dbus-string.c:446
void _dbus_request_file_descriptor_limit(unsigned int limit)
Attempt to ensure that the current process can open at least file descriptors.
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