D-Bus  1.10.12
dbus-sysdeps-unix.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-sysdeps-unix.c Wrappers around UNIX system/libc features (internal to D-Bus implementation)
3  *
4  * Copyright (C) 2002, 2003, 2006 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 
27 #include "dbus-internals.h"
28 #include "dbus-sysdeps.h"
29 #include "dbus-sysdeps-unix.h"
30 #include "dbus-threads.h"
31 #include "dbus-protocol.h"
32 #include "dbus-file.h"
33 #include "dbus-transport.h"
34 #include "dbus-string.h"
35 #include "dbus-userdb.h"
36 #include "dbus-list.h"
37 #include "dbus-credentials.h"
38 #include "dbus-nonce.h"
39 
40 #include <sys/types.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <signal.h>
44 #include <unistd.h>
45 #include <stdio.h>
46 #include <fcntl.h>
47 #include <sys/socket.h>
48 #include <dirent.h>
49 #include <sys/un.h>
50 #include <pwd.h>
51 #include <time.h>
52 #include <locale.h>
53 #include <sys/time.h>
54 #include <sys/stat.h>
55 #include <sys/wait.h>
56 #include <netinet/in.h>
57 #include <netinet/tcp.h>
58 #include <netdb.h>
59 #include <grp.h>
60 #include <arpa/inet.h>
61 
62 #ifdef HAVE_ERRNO_H
63 #include <errno.h>
64 #endif
65 #ifdef HAVE_WRITEV
66 #include <sys/uio.h>
67 #endif
68 #ifdef HAVE_POLL
69 #include <sys/poll.h>
70 #endif
71 #ifdef HAVE_BACKTRACE
72 #include <execinfo.h>
73 #endif
74 #ifdef HAVE_GETPEERUCRED
75 #include <ucred.h>
76 #endif
77 #ifdef HAVE_ALLOCA_H
78 #include <alloca.h>
79 #endif
80 
81 #ifdef HAVE_ADT
82 #include <bsm/adt.h>
83 #endif
84 
85 #ifdef HAVE_SYSTEMD
86 #include <systemd/sd-daemon.h>
87 #endif
88 
89 #if !DBUS_USE_SYNC
90 #include <pthread.h>
91 #endif
92 
93 #ifndef O_BINARY
94 #define O_BINARY 0
95 #endif
96 
97 #ifndef AI_ADDRCONFIG
98 #define AI_ADDRCONFIG 0
99 #endif
100 
101 #ifndef HAVE_SOCKLEN_T
102 #define socklen_t int
103 #endif
104 
105 #if defined (__sun) || defined (__sun__)
106 /*
107  * CMS_SPACE etc. definitions for Solaris < 10, based on
108  * http://mailman.videolan.org/pipermail/vlc-devel/2006-May/024402.html
109  * via
110  * http://wiki.opencsw.org/porting-faq#toc10
111  *
112  * These are only redefined for Solaris, for now: if your OS needs these too,
113  * please file a bug. (Or preferably, improve your OS so they're not needed.)
114  */
115 
116 # ifndef CMSG_ALIGN
117 # ifdef __sun__
118 # define CMSG_ALIGN(len) _CMSG_DATA_ALIGN (len)
119 # else
120  /* aligning to sizeof (long) is assumed to be portable (fd.o#40235) */
121 # define CMSG_ALIGN(len) (((len) + sizeof (long) - 1) & \
122  ~(sizeof (long) - 1))
123 # endif
124 # endif
125 
126 # ifndef CMSG_SPACE
127 # define CMSG_SPACE(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + \
128  CMSG_ALIGN (len))
129 # endif
130 
131 # ifndef CMSG_LEN
132 # define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
133 # endif
134 
135 #endif /* Solaris */
136 
152 _dbus_ensure_standard_fds (DBusEnsureStandardFdsFlags flags,
153  const char **error_str_p)
154 {
155  static int const relevant_flag[] = { DBUS_FORCE_STDIN_NULL,
156  DBUS_FORCE_STDOUT_NULL,
157  DBUS_FORCE_STDERR_NULL };
158  /* Should always get replaced with the real error before use */
159  const char *error_str = "Failed mysteriously";
160  int devnull = -1;
161  int saved_errno;
162  /* This function relies on the standard fds having their POSIX values. */
163  _DBUS_STATIC_ASSERT (STDIN_FILENO == 0);
164  _DBUS_STATIC_ASSERT (STDOUT_FILENO == 1);
165  _DBUS_STATIC_ASSERT (STDERR_FILENO == 2);
166  int i;
167 
168  for (i = STDIN_FILENO; i <= STDERR_FILENO; i++)
169  {
170  /* Because we rely on being single-threaded, and we want the
171  * standard fds to not be close-on-exec, we don't set it
172  * close-on-exec. */
173  if (devnull < i)
174  devnull = open ("/dev/null", O_RDWR);
175 
176  if (devnull < 0)
177  {
178  error_str = "Failed to open /dev/null";
179  goto out;
180  }
181 
182  /* We already opened all fds < i, so the only way this assertion
183  * could fail is if another thread closed one, and we document
184  * this function as not safe for multi-threading. */
185  _dbus_assert (devnull >= i);
186 
187  if (devnull != i && (flags & relevant_flag[i]) != 0)
188  {
189  if (dup2 (devnull, i) < 0)
190  {
191  error_str = "Failed to dup2 /dev/null onto a standard fd";
192  goto out;
193  }
194  }
195  }
196 
197  error_str = NULL;
198 
199 out:
200  saved_errno = errno;
201 
202  if (devnull > STDERR_FILENO)
203  close (devnull);
204 
205  if (error_str_p != NULL)
206  *error_str_p = error_str;
207 
208  errno = saved_errno;
209  return (error_str == NULL);
210 }
211 
212 static dbus_bool_t _dbus_set_fd_nonblocking (int fd,
213  DBusError *error);
214 
215 static dbus_bool_t
216 _dbus_open_socket (int *fd_p,
217  int domain,
218  int type,
219  int protocol,
220  DBusError *error)
221 {
222 #ifdef SOCK_CLOEXEC
223  dbus_bool_t cloexec_done;
224 
225  *fd_p = socket (domain, type | SOCK_CLOEXEC, protocol);
226  cloexec_done = *fd_p >= 0;
227 
228  /* Check if kernel seems to be too old to know SOCK_CLOEXEC */
229  if (*fd_p < 0 && (errno == EINVAL || errno == EPROTOTYPE))
230 #endif
231  {
232  *fd_p = socket (domain, type, protocol);
233  }
234 
235  if (*fd_p >= 0)
236  {
237 #ifdef SOCK_CLOEXEC
238  if (!cloexec_done)
239 #endif
240  {
242  }
243 
244  _dbus_verbose ("socket fd %d opened\n", *fd_p);
245  return TRUE;
246  }
247  else
248  {
249  dbus_set_error(error,
250  _dbus_error_from_errno (errno),
251  "Failed to open socket: %s",
252  _dbus_strerror (errno));
253  return FALSE;
254  }
255 }
256 
267 static dbus_bool_t
268 _dbus_open_unix_socket (int *fd,
269  DBusError *error)
270 {
271  return _dbus_open_socket(fd, PF_UNIX, SOCK_STREAM, 0, error);
272 }
273 
284  DBusError *error)
285 {
286  return _dbus_close (fd.fd, error);
287 }
288 
298 int
300  DBusString *buffer,
301  int count)
302 {
303  return _dbus_read (fd.fd, buffer, count);
304 }
305 
316 int
318  const DBusString *buffer,
319  int start,
320  int len)
321 {
322 #if HAVE_DECL_MSG_NOSIGNAL
323  const char *data;
324  int bytes_written;
325 
326  data = _dbus_string_get_const_data_len (buffer, start, len);
327 
328  again:
329 
330  bytes_written = send (fd.fd, data, len, MSG_NOSIGNAL);
331 
332  if (bytes_written < 0 && errno == EINTR)
333  goto again;
334 
335  return bytes_written;
336 
337 #else
338  return _dbus_write (fd.fd, buffer, start, len);
339 #endif
340 }
341 
354 int
356  DBusString *buffer,
357  int count,
358  int *fds,
359  int *n_fds) {
360 #ifndef HAVE_UNIX_FD_PASSING
361  int r;
362 
363  if ((r = _dbus_read_socket(fd, buffer, count)) < 0)
364  return r;
365 
366  *n_fds = 0;
367  return r;
368 
369 #else
370  int bytes_read;
371  int start;
372  struct msghdr m;
373  struct iovec iov;
374 
375  _dbus_assert (count >= 0);
376  _dbus_assert (*n_fds >= 0);
377 
378  start = _dbus_string_get_length (buffer);
379 
380  if (!_dbus_string_lengthen (buffer, count))
381  {
382  errno = ENOMEM;
383  return -1;
384  }
385 
386  _DBUS_ZERO(iov);
387  iov.iov_base = _dbus_string_get_data_len (buffer, start, count);
388  iov.iov_len = count;
389 
390  _DBUS_ZERO(m);
391  m.msg_iov = &iov;
392  m.msg_iovlen = 1;
393 
394  /* Hmm, we have no clue how long the control data will actually be
395  that is queued for us. The least we can do is assume that the
396  caller knows. Hence let's make space for the number of fds that
397  we shall read at max plus the cmsg header. */
398  m.msg_controllen = CMSG_SPACE(*n_fds * sizeof(int));
399 
400  /* It's probably safe to assume that systems with SCM_RIGHTS also
401  know alloca() */
402  m.msg_control = alloca(m.msg_controllen);
403  memset(m.msg_control, 0, m.msg_controllen);
404 
405  /* Do not include the padding at the end when we tell the kernel
406  * how much we're willing to receive. This avoids getting
407  * the padding filled with additional fds that we weren't expecting,
408  * if a (potentially malicious) sender included them. (fd.o #83622) */
409  m.msg_controllen = CMSG_LEN (*n_fds * sizeof(int));
410 
411  again:
412 
413  bytes_read = recvmsg (fd.fd, &m, 0
414 #ifdef MSG_CMSG_CLOEXEC
415  |MSG_CMSG_CLOEXEC
416 #endif
417  );
418 
419  if (bytes_read < 0)
420  {
421  if (errno == EINTR)
422  goto again;
423  else
424  {
425  /* put length back (note that this doesn't actually realloc anything) */
426  _dbus_string_set_length (buffer, start);
427  return -1;
428  }
429  }
430  else
431  {
432  struct cmsghdr *cm;
433  dbus_bool_t found = FALSE;
434 
435  if (m.msg_flags & MSG_CTRUNC)
436  {
437  /* Hmm, apparently the control data was truncated. The bad
438  thing is that we might have completely lost a couple of fds
439  without chance to recover them. Hence let's treat this as a
440  serious error. */
441 
442  errno = ENOSPC;
443  _dbus_string_set_length (buffer, start);
444  return -1;
445  }
446 
447  for (cm = CMSG_FIRSTHDR(&m); cm; cm = CMSG_NXTHDR(&m, cm))
448  if (cm->cmsg_level == SOL_SOCKET && cm->cmsg_type == SCM_RIGHTS)
449  {
450  size_t i;
451  int *payload = (int *) CMSG_DATA (cm);
452  size_t payload_len_bytes = (cm->cmsg_len - CMSG_LEN (0));
453  size_t payload_len_fds = payload_len_bytes / sizeof (int);
454  size_t fds_to_use;
455 
456  /* Every non-negative int fits in a size_t without truncation,
457  * and we already know that *n_fds is non-negative, so
458  * casting (size_t) *n_fds is OK */
459  _DBUS_STATIC_ASSERT (sizeof (size_t) >= sizeof (int));
460 
461  if (_DBUS_LIKELY (payload_len_fds <= (size_t) *n_fds))
462  {
463  /* The fds in the payload will fit in our buffer */
464  fds_to_use = payload_len_fds;
465  }
466  else
467  {
468  /* Too many fds in the payload. This shouldn't happen
469  * any more because we're setting m.msg_controllen to
470  * the exact number we can accept, but be safe and
471  * truncate. */
472  fds_to_use = (size_t) *n_fds;
473 
474  /* Close the excess fds to avoid DoS: if they stayed open,
475  * someone could send us an extra fd per message
476  * and we'd eventually run out. */
477  for (i = fds_to_use; i < payload_len_fds; i++)
478  {
479  close (payload[i]);
480  }
481  }
482 
483  memcpy (fds, payload, fds_to_use * sizeof (int));
484  found = TRUE;
485  /* This cannot overflow because we have chosen fds_to_use
486  * to be <= *n_fds */
487  *n_fds = (int) fds_to_use;
488 
489  /* Linux doesn't tell us whether MSG_CMSG_CLOEXEC actually
490  worked, hence we need to go through this list and set
491  CLOEXEC everywhere in any case */
492  for (i = 0; i < fds_to_use; i++)
494 
495  break;
496  }
497 
498  if (!found)
499  *n_fds = 0;
500 
501  /* put length back (doesn't actually realloc) */
502  _dbus_string_set_length (buffer, start + bytes_read);
503 
504 #if 0
505  if (bytes_read > 0)
506  _dbus_verbose_bytes_of_string (buffer, start, bytes_read);
507 #endif
508 
509  return bytes_read;
510  }
511 #endif
512 }
513 
514 int
515 _dbus_write_socket_with_unix_fds(DBusSocket fd,
516  const DBusString *buffer,
517  int start,
518  int len,
519  const int *fds,
520  int n_fds) {
521 
522 #ifndef HAVE_UNIX_FD_PASSING
523 
524  if (n_fds > 0) {
525  errno = ENOTSUP;
526  return -1;
527  }
528 
529  return _dbus_write_socket(fd, buffer, start, len);
530 #else
531  return _dbus_write_socket_with_unix_fds_two(fd, buffer, start, len, NULL, 0, 0, fds, n_fds);
532 #endif
533 }
534 
535 int
536 _dbus_write_socket_with_unix_fds_two(DBusSocket fd,
537  const DBusString *buffer1,
538  int start1,
539  int len1,
540  const DBusString *buffer2,
541  int start2,
542  int len2,
543  const int *fds,
544  int n_fds) {
545 
546 #ifndef HAVE_UNIX_FD_PASSING
547 
548  if (n_fds > 0) {
549  errno = ENOTSUP;
550  return -1;
551  }
552 
553  return _dbus_write_socket_two(fd,
554  buffer1, start1, len1,
555  buffer2, start2, len2);
556 #else
557 
558  struct msghdr m;
559  struct cmsghdr *cm;
560  struct iovec iov[2];
561  int bytes_written;
562 
563  _dbus_assert (len1 >= 0);
564  _dbus_assert (len2 >= 0);
565  _dbus_assert (n_fds >= 0);
566 
567  _DBUS_ZERO(iov);
568  iov[0].iov_base = (char*) _dbus_string_get_const_data_len (buffer1, start1, len1);
569  iov[0].iov_len = len1;
570 
571  if (buffer2)
572  {
573  iov[1].iov_base = (char*) _dbus_string_get_const_data_len (buffer2, start2, len2);
574  iov[1].iov_len = len2;
575  }
576 
577  _DBUS_ZERO(m);
578  m.msg_iov = iov;
579  m.msg_iovlen = buffer2 ? 2 : 1;
580 
581  if (n_fds > 0)
582  {
583  m.msg_controllen = CMSG_SPACE(n_fds * sizeof(int));
584  m.msg_control = alloca(m.msg_controllen);
585  memset(m.msg_control, 0, m.msg_controllen);
586 
587  cm = CMSG_FIRSTHDR(&m);
588  cm->cmsg_level = SOL_SOCKET;
589  cm->cmsg_type = SCM_RIGHTS;
590  cm->cmsg_len = CMSG_LEN(n_fds * sizeof(int));
591  memcpy(CMSG_DATA(cm), fds, n_fds * sizeof(int));
592  }
593 
594  again:
595 
596  bytes_written = sendmsg (fd.fd, &m, 0
597 #if HAVE_DECL_MSG_NOSIGNAL
598  |MSG_NOSIGNAL
599 #endif
600  );
601 
602  if (bytes_written < 0 && errno == EINTR)
603  goto again;
604 
605 #if 0
606  if (bytes_written > 0)
607  _dbus_verbose_bytes_of_string (buffer, start, bytes_written);
608 #endif
609 
610  return bytes_written;
611 #endif
612 }
613 
627 int
629  const DBusString *buffer1,
630  int start1,
631  int len1,
632  const DBusString *buffer2,
633  int start2,
634  int len2)
635 {
636 #if HAVE_DECL_MSG_NOSIGNAL
637  struct iovec vectors[2];
638  const char *data1;
639  const char *data2;
640  int bytes_written;
641  struct msghdr m;
642 
643  _dbus_assert (buffer1 != NULL);
644  _dbus_assert (start1 >= 0);
645  _dbus_assert (start2 >= 0);
646  _dbus_assert (len1 >= 0);
647  _dbus_assert (len2 >= 0);
648 
649  data1 = _dbus_string_get_const_data_len (buffer1, start1, len1);
650 
651  if (buffer2 != NULL)
652  data2 = _dbus_string_get_const_data_len (buffer2, start2, len2);
653  else
654  {
655  data2 = NULL;
656  start2 = 0;
657  len2 = 0;
658  }
659 
660  vectors[0].iov_base = (char*) data1;
661  vectors[0].iov_len = len1;
662  vectors[1].iov_base = (char*) data2;
663  vectors[1].iov_len = len2;
664 
665  _DBUS_ZERO(m);
666  m.msg_iov = vectors;
667  m.msg_iovlen = data2 ? 2 : 1;
668 
669  again:
670 
671  bytes_written = sendmsg (fd.fd, &m, MSG_NOSIGNAL);
672 
673  if (bytes_written < 0 && errno == EINTR)
674  goto again;
675 
676  return bytes_written;
677 
678 #else
679  return _dbus_write_two (fd.fd, buffer1, start1, len1,
680  buffer2, start2, len2);
681 #endif
682 }
683 
700 int
701 _dbus_read (int fd,
702  DBusString *buffer,
703  int count)
704 {
705  int bytes_read;
706  int start;
707  char *data;
708 
709  _dbus_assert (count >= 0);
710 
711  start = _dbus_string_get_length (buffer);
712 
713  if (!_dbus_string_lengthen (buffer, count))
714  {
715  errno = ENOMEM;
716  return -1;
717  }
718 
719  data = _dbus_string_get_data_len (buffer, start, count);
720 
721  again:
722 
723  bytes_read = read (fd, data, count);
724 
725  if (bytes_read < 0)
726  {
727  if (errno == EINTR)
728  goto again;
729  else
730  {
731  /* put length back (note that this doesn't actually realloc anything) */
732  _dbus_string_set_length (buffer, start);
733  return -1;
734  }
735  }
736  else
737  {
738  /* put length back (doesn't actually realloc) */
739  _dbus_string_set_length (buffer, start + bytes_read);
740 
741 #if 0
742  if (bytes_read > 0)
743  _dbus_verbose_bytes_of_string (buffer, start, bytes_read);
744 #endif
745 
746  return bytes_read;
747  }
748 }
749 
760 int
761 _dbus_write (int fd,
762  const DBusString *buffer,
763  int start,
764  int len)
765 {
766  const char *data;
767  int bytes_written;
768 
769  data = _dbus_string_get_const_data_len (buffer, start, len);
770 
771  again:
772 
773  bytes_written = write (fd, data, len);
774 
775  if (bytes_written < 0 && errno == EINTR)
776  goto again;
777 
778 #if 0
779  if (bytes_written > 0)
780  _dbus_verbose_bytes_of_string (buffer, start, bytes_written);
781 #endif
782 
783  return bytes_written;
784 }
785 
806 int
808  const DBusString *buffer1,
809  int start1,
810  int len1,
811  const DBusString *buffer2,
812  int start2,
813  int len2)
814 {
815  _dbus_assert (buffer1 != NULL);
816  _dbus_assert (start1 >= 0);
817  _dbus_assert (start2 >= 0);
818  _dbus_assert (len1 >= 0);
819  _dbus_assert (len2 >= 0);
820 
821 #ifdef HAVE_WRITEV
822  {
823  struct iovec vectors[2];
824  const char *data1;
825  const char *data2;
826  int bytes_written;
827 
828  data1 = _dbus_string_get_const_data_len (buffer1, start1, len1);
829 
830  if (buffer2 != NULL)
831  data2 = _dbus_string_get_const_data_len (buffer2, start2, len2);
832  else
833  {
834  data2 = NULL;
835  start2 = 0;
836  len2 = 0;
837  }
838 
839  vectors[0].iov_base = (char*) data1;
840  vectors[0].iov_len = len1;
841  vectors[1].iov_base = (char*) data2;
842  vectors[1].iov_len = len2;
843 
844  again:
845 
846  bytes_written = writev (fd,
847  vectors,
848  data2 ? 2 : 1);
849 
850  if (bytes_written < 0 && errno == EINTR)
851  goto again;
852 
853  return bytes_written;
854  }
855 #else /* HAVE_WRITEV */
856  {
857  int ret1, ret2;
858 
859  ret1 = _dbus_write (fd, buffer1, start1, len1);
860  if (ret1 == len1 && buffer2 != NULL)
861  {
862  ret2 = _dbus_write (fd, buffer2, start2, len2);
863  if (ret2 < 0)
864  ret2 = 0; /* we can't report an error as the first write was OK */
865 
866  return ret1 + ret2;
867  }
868  else
869  return ret1;
870  }
871 #endif /* !HAVE_WRITEV */
872 }
873 
874 #define _DBUS_MAX_SUN_PATH_LENGTH 99
875 
905 int
906 _dbus_connect_unix_socket (const char *path,
907  dbus_bool_t abstract,
908  DBusError *error)
909 {
910  int fd;
911  size_t path_len;
912  struct sockaddr_un addr;
913 
914  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
915 
916  _dbus_verbose ("connecting to unix socket %s abstract=%d\n",
917  path, abstract);
918 
919 
920  if (!_dbus_open_unix_socket (&fd, error))
921  {
922  _DBUS_ASSERT_ERROR_IS_SET(error);
923  return -1;
924  }
925  _DBUS_ASSERT_ERROR_IS_CLEAR(error);
926 
927  _DBUS_ZERO (addr);
928  addr.sun_family = AF_UNIX;
929  path_len = strlen (path);
930 
931  if (abstract)
932  {
933 #ifdef HAVE_ABSTRACT_SOCKETS
934  addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
935  path_len++; /* Account for the extra nul byte added to the start of sun_path */
936 
937  if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
938  {
940  "Abstract socket name too long\n");
941  _dbus_close (fd, NULL);
942  return -1;
943  }
944 
945  strncpy (&addr.sun_path[1], path, path_len);
946  /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
947 #else /* HAVE_ABSTRACT_SOCKETS */
949  "Operating system does not support abstract socket namespace\n");
950  _dbus_close (fd, NULL);
951  return -1;
952 #endif /* ! HAVE_ABSTRACT_SOCKETS */
953  }
954  else
955  {
956  if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
957  {
959  "Socket name too long\n");
960  _dbus_close (fd, NULL);
961  return -1;
962  }
963 
964  strncpy (addr.sun_path, path, path_len);
965  }
966 
967  if (connect (fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
968  {
969  dbus_set_error (error,
970  _dbus_error_from_errno (errno),
971  "Failed to connect to socket %s: %s",
972  path, _dbus_strerror (errno));
973 
974  _dbus_close (fd, NULL);
975  return -1;
976  }
977 
978  if (!_dbus_set_fd_nonblocking (fd, error))
979  {
980  _DBUS_ASSERT_ERROR_IS_SET (error);
981 
982  _dbus_close (fd, NULL);
983  return -1;
984  }
985 
986  return fd;
987 }
988 
1001 int
1002 _dbus_connect_exec (const char *path,
1003  char *const argv[],
1004  DBusError *error)
1005 {
1006  int fds[2];
1007  pid_t pid;
1008  int retval;
1009  dbus_bool_t cloexec_done = 0;
1010 
1011  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1012 
1013  _dbus_verbose ("connecting to process %s\n", path);
1014 
1015 #ifdef SOCK_CLOEXEC
1016  retval = socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, fds);
1017  cloexec_done = (retval >= 0);
1018 
1019  if (retval < 0 && (errno == EINVAL || errno == EPROTOTYPE))
1020 #endif
1021  {
1022  retval = socketpair (AF_UNIX, SOCK_STREAM, 0, fds);
1023  }
1024 
1025  if (retval < 0)
1026  {
1027  dbus_set_error (error,
1028  _dbus_error_from_errno (errno),
1029  "Failed to create socket pair: %s",
1030  _dbus_strerror (errno));
1031  return -1;
1032  }
1033 
1034  if (!cloexec_done)
1035  {
1036  _dbus_fd_set_close_on_exec (fds[0]);
1037  _dbus_fd_set_close_on_exec (fds[1]);
1038  }
1039 
1040  pid = fork ();
1041  if (pid < 0)
1042  {
1043  dbus_set_error (error,
1044  _dbus_error_from_errno (errno),
1045  "Failed to fork() to call %s: %s",
1046  path, _dbus_strerror (errno));
1047  close (fds[0]);
1048  close (fds[1]);
1049  return -1;
1050  }
1051 
1052  if (pid == 0)
1053  {
1054  /* child */
1055  close (fds[0]);
1056 
1057  dup2 (fds[1], STDIN_FILENO);
1058  dup2 (fds[1], STDOUT_FILENO);
1059 
1060  if (fds[1] != STDIN_FILENO &&
1061  fds[1] != STDOUT_FILENO)
1062  close (fds[1]);
1063 
1064  /* Inherit STDERR and the controlling terminal from the
1065  parent */
1066 
1067  _dbus_close_all ();
1068 
1069  execvp (path, argv);
1070 
1071  fprintf (stderr, "Failed to execute process %s: %s\n", path, _dbus_strerror (errno));
1072 
1073  _exit(1);
1074  }
1075 
1076  /* parent */
1077  close (fds[1]);
1078 
1079  if (!_dbus_set_fd_nonblocking (fds[0], error))
1080  {
1081  _DBUS_ASSERT_ERROR_IS_SET (error);
1082 
1083  close (fds[0]);
1084  return -1;
1085  }
1086 
1087  return fds[0];
1088 }
1089 
1107 int
1108 _dbus_listen_unix_socket (const char *path,
1109  dbus_bool_t abstract,
1110  DBusError *error)
1111 {
1112  int listen_fd;
1113  struct sockaddr_un addr;
1114  size_t path_len;
1115 
1116  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1117 
1118  _dbus_verbose ("listening on unix socket %s abstract=%d\n",
1119  path, abstract);
1120 
1121  if (!_dbus_open_unix_socket (&listen_fd, error))
1122  {
1123  _DBUS_ASSERT_ERROR_IS_SET(error);
1124  return -1;
1125  }
1126  _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1127 
1128  _DBUS_ZERO (addr);
1129  addr.sun_family = AF_UNIX;
1130  path_len = strlen (path);
1131 
1132  if (abstract)
1133  {
1134 #ifdef HAVE_ABSTRACT_SOCKETS
1135  /* remember that abstract names aren't nul-terminated so we rely
1136  * on sun_path being filled in with zeroes above.
1137  */
1138  addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
1139  path_len++; /* Account for the extra nul byte added to the start of sun_path */
1140 
1141  if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
1142  {
1144  "Abstract socket name too long\n");
1145  _dbus_close (listen_fd, NULL);
1146  return -1;
1147  }
1148 
1149  strncpy (&addr.sun_path[1], path, path_len);
1150  /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
1151 #else /* HAVE_ABSTRACT_SOCKETS */
1153  "Operating system does not support abstract socket namespace\n");
1154  _dbus_close (listen_fd, NULL);
1155  return -1;
1156 #endif /* ! HAVE_ABSTRACT_SOCKETS */
1157  }
1158  else
1159  {
1160  /* Discussed security implications of this with Nalin,
1161  * and we couldn't think of where it would kick our ass, but
1162  * it still seems a bit sucky. It also has non-security suckage;
1163  * really we'd prefer to exit if the socket is already in use.
1164  * But there doesn't seem to be a good way to do this.
1165  *
1166  * Just to be extra careful, I threw in the stat() - clearly
1167  * the stat() can't *fix* any security issue, but it at least
1168  * avoids inadvertent/accidental data loss.
1169  */
1170  {
1171  struct stat sb;
1172 
1173  if (stat (path, &sb) == 0 &&
1174  S_ISSOCK (sb.st_mode))
1175  unlink (path);
1176  }
1177 
1178  if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
1179  {
1181  "Socket name too long\n");
1182  _dbus_close (listen_fd, NULL);
1183  return -1;
1184  }
1185 
1186  strncpy (addr.sun_path, path, path_len);
1187  }
1188 
1189  if (bind (listen_fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
1190  {
1191  dbus_set_error (error, _dbus_error_from_errno (errno),
1192  "Failed to bind socket \"%s\": %s",
1193  path, _dbus_strerror (errno));
1194  _dbus_close (listen_fd, NULL);
1195  return -1;
1196  }
1197 
1198  if (listen (listen_fd, 30 /* backlog */) < 0)
1199  {
1200  dbus_set_error (error, _dbus_error_from_errno (errno),
1201  "Failed to listen on socket \"%s\": %s",
1202  path, _dbus_strerror (errno));
1203  _dbus_close (listen_fd, NULL);
1204  return -1;
1205  }
1206 
1207  if (!_dbus_set_fd_nonblocking (listen_fd, error))
1208  {
1209  _DBUS_ASSERT_ERROR_IS_SET (error);
1210  _dbus_close (listen_fd, NULL);
1211  return -1;
1212  }
1213 
1214  /* Try opening up the permissions, but if we can't, just go ahead
1215  * and continue, maybe it will be good enough.
1216  */
1217  if (!abstract && chmod (path, 0777) < 0)
1218  _dbus_warn ("Could not set mode 0777 on socket %s\n",
1219  path);
1220 
1221  return listen_fd;
1222 }
1223 
1234 int
1236  DBusError *error)
1237 {
1238 #ifdef HAVE_SYSTEMD
1239  int r, n;
1240  int fd;
1241  DBusSocket *new_fds;
1242 
1243  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1244 
1245  n = sd_listen_fds (TRUE);
1246  if (n < 0)
1247  {
1249  "Failed to acquire systemd socket: %s",
1250  _dbus_strerror (-n));
1251  return -1;
1252  }
1253 
1254  if (n <= 0)
1255  {
1257  "No socket received.");
1258  return -1;
1259  }
1260 
1261  for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1262  {
1263  r = sd_is_socket (fd, AF_UNSPEC, SOCK_STREAM, 1);
1264  if (r < 0)
1265  {
1267  "Failed to verify systemd socket type: %s",
1268  _dbus_strerror (-r));
1269  return -1;
1270  }
1271 
1272  if (!r)
1273  {
1275  "Passed socket has wrong type.");
1276  return -1;
1277  }
1278  }
1279 
1280  /* OK, the file descriptors are all good, so let's take posession of
1281  them then. */
1282 
1283  new_fds = dbus_new (DBusSocket, n);
1284  if (!new_fds)
1285  {
1287  "Failed to allocate file handle array.");
1288  goto fail;
1289  }
1290 
1291  for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1292  {
1293  if (!_dbus_set_fd_nonblocking (fd, error))
1294  {
1295  _DBUS_ASSERT_ERROR_IS_SET (error);
1296  goto fail;
1297  }
1298 
1299  new_fds[fd - SD_LISTEN_FDS_START].fd = fd;
1300  }
1301 
1302  *fds = new_fds;
1303  return n;
1304 
1305  fail:
1306 
1307  for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1308  {
1309  _dbus_close (fd, NULL);
1310  }
1311 
1312  dbus_free (new_fds);
1313  return -1;
1314 #else
1316  "dbus was compiled without systemd support");
1317  return -1;
1318 #endif
1319 }
1320 
1334 DBusSocket
1335 _dbus_connect_tcp_socket (const char *host,
1336  const char *port,
1337  const char *family,
1338  DBusError *error)
1339 {
1340  return _dbus_connect_tcp_socket_with_nonce (host, port, family, (const char*)NULL, error);
1341 }
1342 
1343 DBusSocket
1344 _dbus_connect_tcp_socket_with_nonce (const char *host,
1345  const char *port,
1346  const char *family,
1347  const char *noncefile,
1348  DBusError *error)
1349 {
1350  int saved_errno = 0;
1351  DBusSocket fd = DBUS_SOCKET_INIT;
1352  int res;
1353  struct addrinfo hints;
1354  struct addrinfo *ai, *tmp;
1355 
1356  _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1357 
1358  _DBUS_ZERO (hints);
1359 
1360  if (!family)
1361  hints.ai_family = AF_UNSPEC;
1362  else if (!strcmp(family, "ipv4"))
1363  hints.ai_family = AF_INET;
1364  else if (!strcmp(family, "ipv6"))
1365  hints.ai_family = AF_INET6;
1366  else
1367  {
1368  dbus_set_error (error,
1370  "Unknown address family %s", family);
1371  return _dbus_socket_get_invalid ();
1372  }
1373  hints.ai_protocol = IPPROTO_TCP;
1374  hints.ai_socktype = SOCK_STREAM;
1375  hints.ai_flags = AI_ADDRCONFIG;
1376 
1377  if ((res = getaddrinfo(host, port, &hints, &ai)) != 0)
1378  {
1379  dbus_set_error (error,
1380  _dbus_error_from_errno (errno),
1381  "Failed to lookup host/port: \"%s:%s\": %s (%d)",
1382  host, port, gai_strerror(res), res);
1383  return _dbus_socket_get_invalid ();
1384  }
1385 
1386  tmp = ai;
1387  while (tmp)
1388  {
1389  if (!_dbus_open_socket (&fd.fd, tmp->ai_family, SOCK_STREAM, 0, error))
1390  {
1391  freeaddrinfo(ai);
1392  _DBUS_ASSERT_ERROR_IS_SET(error);
1393  return _dbus_socket_get_invalid ();
1394  }
1395  _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1396 
1397  if (connect (fd.fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
1398  {
1399  saved_errno = errno;
1400  _dbus_close (fd.fd, NULL);
1401  fd.fd = -1;
1402  tmp = tmp->ai_next;
1403  continue;
1404  }
1405 
1406  break;
1407  }
1408  freeaddrinfo(ai);
1409 
1410  if (fd.fd == -1)
1411  {
1412  dbus_set_error (error,
1413  _dbus_error_from_errno (saved_errno),
1414  "Failed to connect to socket \"%s:%s\" %s",
1415  host, port, _dbus_strerror(saved_errno));
1416  return _dbus_socket_get_invalid ();
1417  }
1418 
1419  if (noncefile != NULL)
1420  {
1421  DBusString noncefileStr;
1422  dbus_bool_t ret;
1423  _dbus_string_init_const (&noncefileStr, noncefile);
1424  ret = _dbus_send_nonce (fd, &noncefileStr, error);
1425  _dbus_string_free (&noncefileStr);
1426 
1427  if (!ret)
1428  {
1429  _dbus_close (fd.fd, NULL);
1430  return _dbus_socket_get_invalid ();
1431  }
1432  }
1433 
1434  if (!_dbus_set_fd_nonblocking (fd.fd, error))
1435  {
1436  _dbus_close (fd.fd, NULL);
1437  return _dbus_socket_get_invalid ();
1438  }
1439 
1440  return fd;
1441 }
1442 
1459 int
1460 _dbus_listen_tcp_socket (const char *host,
1461  const char *port,
1462  const char *family,
1463  DBusString *retport,
1464  DBusSocket **fds_p,
1465  DBusError *error)
1466 {
1467  int saved_errno;
1468  int nlisten_fd = 0, res, i;
1469  DBusSocket *listen_fd = NULL;
1470  struct addrinfo hints;
1471  struct addrinfo *ai, *tmp;
1472  unsigned int reuseaddr;
1473 
1474  *fds_p = NULL;
1475  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1476 
1477  _DBUS_ZERO (hints);
1478 
1479  if (!family)
1480  hints.ai_family = AF_UNSPEC;
1481  else if (!strcmp(family, "ipv4"))
1482  hints.ai_family = AF_INET;
1483  else if (!strcmp(family, "ipv6"))
1484  hints.ai_family = AF_INET6;
1485  else
1486  {
1487  dbus_set_error (error,
1489  "Unknown address family %s", family);
1490  return -1;
1491  }
1492 
1493  hints.ai_protocol = IPPROTO_TCP;
1494  hints.ai_socktype = SOCK_STREAM;
1495  hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1496 
1497  redo_lookup_with_port:
1498  ai = NULL;
1499  if ((res = getaddrinfo(host, port, &hints, &ai)) != 0 || !ai)
1500  {
1501  dbus_set_error (error,
1502  _dbus_error_from_errno (errno),
1503  "Failed to lookup host/port: \"%s:%s\": %s (%d)",
1504  host ? host : "*", port, gai_strerror(res), res);
1505  goto failed;
1506  }
1507 
1508  tmp = ai;
1509  while (tmp)
1510  {
1511  int fd = -1, tcp_nodelay_on;
1512  DBusSocket *newlisten_fd;
1513 
1514  if (!_dbus_open_socket (&fd, tmp->ai_family, SOCK_STREAM, 0, error))
1515  {
1516  _DBUS_ASSERT_ERROR_IS_SET(error);
1517  goto failed;
1518  }
1519  _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1520 
1521  reuseaddr = 1;
1522  if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(reuseaddr))==-1)
1523  {
1524  _dbus_warn ("Failed to set socket option \"%s:%s\": %s",
1525  host ? host : "*", port, _dbus_strerror (errno));
1526  }
1527 
1528  /* Nagle's algorithm imposes a huge delay on the initial messages
1529  going over TCP. */
1530  tcp_nodelay_on = 1;
1531  if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &tcp_nodelay_on, sizeof (tcp_nodelay_on)) == -1)
1532  {
1533  _dbus_warn ("Failed to set TCP_NODELAY socket option \"%s:%s\": %s",
1534  host ? host : "*", port, _dbus_strerror (errno));
1535  }
1536 
1537  if (bind (fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
1538  {
1539  saved_errno = errno;
1540  _dbus_close(fd, NULL);
1541  if (saved_errno == EADDRINUSE)
1542  {
1543  /* Depending on kernel policy, binding to an IPv6 address
1544  might implicitly bind to a corresponding IPv4
1545  address or vice versa, resulting in EADDRINUSE for the
1546  other one (e.g. bindv6only=0 on Linux).
1547 
1548  Also, after we "goto redo_lookup_with_port" after binding
1549  a port on one of the possible addresses, we will
1550  try to bind that same port on every address, including the
1551  same address again for a second time; that one will
1552  also fail with EADDRINUSE.
1553 
1554  For both those reasons, ignore EADDRINUSE here */
1555  tmp = tmp->ai_next;
1556  continue;
1557  }
1558  dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1559  "Failed to bind socket \"%s:%s\": %s",
1560  host ? host : "*", port, _dbus_strerror (saved_errno));
1561  goto failed;
1562  }
1563 
1564  if (listen (fd, 30 /* backlog */) < 0)
1565  {
1566  saved_errno = errno;
1567  _dbus_close (fd, NULL);
1568  dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1569  "Failed to listen on socket \"%s:%s\": %s",
1570  host ? host : "*", port, _dbus_strerror (saved_errno));
1571  goto failed;
1572  }
1573 
1574  newlisten_fd = dbus_realloc(listen_fd, sizeof(DBusSocket)*(nlisten_fd+1));
1575  if (!newlisten_fd)
1576  {
1577  saved_errno = errno;
1578  _dbus_close (fd, NULL);
1579  dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1580  "Failed to allocate file handle array: %s",
1581  _dbus_strerror (saved_errno));
1582  goto failed;
1583  }
1584  listen_fd = newlisten_fd;
1585  listen_fd[nlisten_fd].fd = fd;
1586  nlisten_fd++;
1587 
1588  if (!_dbus_string_get_length(retport))
1589  {
1590  /* If the user didn't specify a port, or used 0, then
1591  the kernel chooses a port. After the first address
1592  is bound to, we need to force all remaining addresses
1593  to use the same port */
1594  if (!port || !strcmp(port, "0"))
1595  {
1596  int result;
1597  struct sockaddr_storage addr;
1598  socklen_t addrlen;
1599  char portbuf[50];
1600 
1601  addrlen = sizeof(addr);
1602  result = getsockname(fd, (struct sockaddr*) &addr, &addrlen);
1603 
1604  if (result == -1 ||
1605  (res = getnameinfo ((struct sockaddr*)&addr, addrlen, NULL, 0,
1606  portbuf, sizeof(portbuf),
1607  NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
1608  {
1609  dbus_set_error (error, _dbus_error_from_errno (errno),
1610  "Failed to resolve port \"%s:%s\": %s (%s)",
1611  host ? host : "*", port, gai_strerror(res), res);
1612  goto failed;
1613  }
1614  if (!_dbus_string_append(retport, portbuf))
1615  {
1617  goto failed;
1618  }
1619 
1620  /* Release current address list & redo lookup */
1621  port = _dbus_string_get_const_data(retport);
1622  freeaddrinfo(ai);
1623  goto redo_lookup_with_port;
1624  }
1625  else
1626  {
1627  if (!_dbus_string_append(retport, port))
1628  {
1630  goto failed;
1631  }
1632  }
1633  }
1634 
1635  tmp = tmp->ai_next;
1636  }
1637  freeaddrinfo(ai);
1638  ai = NULL;
1639 
1640  if (!nlisten_fd)
1641  {
1642  errno = EADDRINUSE;
1643  dbus_set_error (error, _dbus_error_from_errno (errno),
1644  "Failed to bind socket \"%s:%s\": %s",
1645  host ? host : "*", port, _dbus_strerror (errno));
1646  goto failed;
1647  }
1648 
1649  for (i = 0 ; i < nlisten_fd ; i++)
1650  {
1651  if (!_dbus_set_fd_nonblocking (listen_fd[i].fd, error))
1652  {
1653  goto failed;
1654  }
1655  }
1656 
1657  *fds_p = listen_fd;
1658 
1659  return nlisten_fd;
1660 
1661  failed:
1662  if (ai)
1663  freeaddrinfo(ai);
1664  for (i = 0 ; i < nlisten_fd ; i++)
1665  _dbus_close(listen_fd[i].fd, NULL);
1666  dbus_free(listen_fd);
1667  return -1;
1668 }
1669 
1670 static dbus_bool_t
1671 write_credentials_byte (int server_fd,
1672  DBusError *error)
1673 {
1674  int bytes_written;
1675  char buf[1] = { '\0' };
1676 #if defined(HAVE_CMSGCRED)
1677  union {
1678  struct cmsghdr hdr;
1679  char cred[CMSG_SPACE (sizeof (struct cmsgcred))];
1680  } cmsg;
1681  struct iovec iov;
1682  struct msghdr msg;
1683  iov.iov_base = buf;
1684  iov.iov_len = 1;
1685 
1686  _DBUS_ZERO(msg);
1687  msg.msg_iov = &iov;
1688  msg.msg_iovlen = 1;
1689 
1690  msg.msg_control = (caddr_t) &cmsg;
1691  msg.msg_controllen = CMSG_SPACE (sizeof (struct cmsgcred));
1692  _DBUS_ZERO(cmsg);
1693  cmsg.hdr.cmsg_len = CMSG_LEN (sizeof (struct cmsgcred));
1694  cmsg.hdr.cmsg_level = SOL_SOCKET;
1695  cmsg.hdr.cmsg_type = SCM_CREDS;
1696 #endif
1697 
1698  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1699 
1700  again:
1701 
1702 #if defined(HAVE_CMSGCRED)
1703  bytes_written = sendmsg (server_fd, &msg, 0
1704 #if HAVE_DECL_MSG_NOSIGNAL
1705  |MSG_NOSIGNAL
1706 #endif
1707  );
1708 
1709  /* If we HAVE_CMSGCRED, the OS still might not let us sendmsg()
1710  * with a SOL_SOCKET/SCM_CREDS message - for instance, FreeBSD
1711  * only allows that on AF_UNIX. Try just doing a send() instead. */
1712  if (bytes_written < 0 && errno == EINVAL)
1713 #endif
1714  {
1715  bytes_written = send (server_fd, buf, 1, 0
1716 #if HAVE_DECL_MSG_NOSIGNAL
1717  |MSG_NOSIGNAL
1718 #endif
1719  );
1720  }
1721 
1722  if (bytes_written < 0 && errno == EINTR)
1723  goto again;
1724 
1725  if (bytes_written < 0)
1726  {
1727  dbus_set_error (error, _dbus_error_from_errno (errno),
1728  "Failed to write credentials byte: %s",
1729  _dbus_strerror (errno));
1730  return FALSE;
1731  }
1732  else if (bytes_written == 0)
1733  {
1735  "wrote zero bytes writing credentials byte");
1736  return FALSE;
1737  }
1738  else
1739  {
1740  _dbus_assert (bytes_written == 1);
1741  _dbus_verbose ("wrote credentials byte\n");
1742  return TRUE;
1743  }
1744 }
1745 
1746 /* return FALSE on OOM, TRUE otherwise, even if no credentials were found */
1747 static dbus_bool_t
1748 add_linux_security_label_to_credentials (int client_fd,
1749  DBusCredentials *credentials)
1750 {
1751 #if defined(__linux__) && defined(SO_PEERSEC)
1752  DBusString buf;
1753  socklen_t len = 1024;
1754  dbus_bool_t oom = FALSE;
1755 
1756  if (!_dbus_string_init_preallocated (&buf, len) ||
1757  !_dbus_string_set_length (&buf, len))
1758  return FALSE;
1759 
1760  while (getsockopt (client_fd, SOL_SOCKET, SO_PEERSEC,
1761  _dbus_string_get_data (&buf), &len) < 0)
1762  {
1763  int e = errno;
1764 
1765  _dbus_verbose ("getsockopt failed with %s, len now %lu\n",
1766  _dbus_strerror (e), (unsigned long) len);
1767 
1768  if (e != ERANGE || len <= _dbus_string_get_length_uint (&buf))
1769  {
1770  _dbus_verbose ("Failed to getsockopt(SO_PEERSEC): %s\n",
1771  _dbus_strerror (e));
1772  goto out;
1773  }
1774 
1775  /* If not enough space, len is updated to be enough.
1776  * Try again with a large enough buffer. */
1777  if (!_dbus_string_set_length (&buf, len))
1778  {
1779  oom = TRUE;
1780  goto out;
1781  }
1782 
1783  _dbus_verbose ("will try again with %lu\n", (unsigned long) len);
1784  }
1785 
1786  if (len <= 0)
1787  {
1788  _dbus_verbose ("getsockopt(SO_PEERSEC) yielded <= 0 bytes: %lu\n",
1789  (unsigned long) len);
1790  goto out;
1791  }
1792 
1793  if (len > _dbus_string_get_length_uint (&buf))
1794  {
1795  _dbus_verbose ("%lu > %u", (unsigned long) len,
1796  _dbus_string_get_length_uint (&buf));
1797  _dbus_assert_not_reached ("getsockopt(SO_PEERSEC) overflowed");
1798  }
1799 
1800  if (_dbus_string_get_byte (&buf, len - 1) == 0)
1801  {
1802  /* the kernel included the trailing \0 in its count,
1803  * but DBusString always has an extra \0 after the data anyway */
1804  _dbus_verbose ("subtracting trailing \\0\n");
1805  len--;
1806  }
1807 
1808  if (!_dbus_string_set_length (&buf, len))
1809  {
1810  _dbus_assert_not_reached ("shortening string should not lead to OOM");
1811  oom = TRUE;
1812  goto out;
1813  }
1814 
1815  if (strlen (_dbus_string_get_const_data (&buf)) != len)
1816  {
1817  /* LSM people on the linux-security-module@ mailing list say this
1818  * should never happen: the label should be a bytestring with
1819  * an optional trailing \0 */
1820  _dbus_verbose ("security label from kernel had an embedded \\0, "
1821  "ignoring it\n");
1822  goto out;
1823  }
1824 
1825  _dbus_verbose ("getsockopt(SO_PEERSEC): %lu bytes excluding \\0: %s\n",
1826  (unsigned long) len,
1827  _dbus_string_get_const_data (&buf));
1828 
1830  _dbus_string_get_const_data (&buf)))
1831  {
1832  oom = TRUE;
1833  goto out;
1834  }
1835 
1836 out:
1837  _dbus_string_free (&buf);
1838  return !oom;
1839 #else
1840  /* no error */
1841  return TRUE;
1842 #endif
1843 }
1844 
1887  DBusCredentials *credentials,
1888  DBusError *error)
1889 {
1890  struct msghdr msg;
1891  struct iovec iov;
1892  char buf;
1893  dbus_uid_t uid_read;
1894  dbus_pid_t pid_read;
1895  int bytes_read;
1896 
1897 #ifdef HAVE_CMSGCRED
1898  union {
1899  struct cmsghdr hdr;
1900  char cred[CMSG_SPACE (sizeof (struct cmsgcred))];
1901  } cmsg;
1902 #endif
1903 
1904  /* The POSIX spec certainly doesn't promise this, but
1905  * we need these assertions to fail as soon as we're wrong about
1906  * it so we can do the porting fixups
1907  */
1908  _DBUS_STATIC_ASSERT (sizeof (pid_t) <= sizeof (dbus_pid_t));
1909  _DBUS_STATIC_ASSERT (sizeof (uid_t) <= sizeof (dbus_uid_t));
1910  _DBUS_STATIC_ASSERT (sizeof (gid_t) <= sizeof (dbus_gid_t));
1911 
1912  uid_read = DBUS_UID_UNSET;
1913  pid_read = DBUS_PID_UNSET;
1914 
1915  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1916 
1917  _dbus_credentials_clear (credentials);
1918 
1919  iov.iov_base = &buf;
1920  iov.iov_len = 1;
1921 
1922  _DBUS_ZERO(msg);
1923  msg.msg_iov = &iov;
1924  msg.msg_iovlen = 1;
1925 
1926 #if defined(HAVE_CMSGCRED)
1927  _DBUS_ZERO(cmsg);
1928  msg.msg_control = (caddr_t) &cmsg;
1929  msg.msg_controllen = CMSG_SPACE (sizeof (struct cmsgcred));
1930 #endif
1931 
1932  again:
1933  bytes_read = recvmsg (client_fd.fd, &msg, 0);
1934 
1935  if (bytes_read < 0)
1936  {
1937  if (errno == EINTR)
1938  goto again;
1939 
1940  /* EAGAIN or EWOULDBLOCK would be unexpected here since we would
1941  * normally only call read_credentials if the socket was ready
1942  * for reading
1943  */
1944 
1945  dbus_set_error (error, _dbus_error_from_errno (errno),
1946  "Failed to read credentials byte: %s",
1947  _dbus_strerror (errno));
1948  return FALSE;
1949  }
1950  else if (bytes_read == 0)
1951  {
1952  /* this should not happen unless we are using recvmsg wrong,
1953  * so is essentially here for paranoia
1954  */
1956  "Failed to read credentials byte (zero-length read)");
1957  return FALSE;
1958  }
1959  else if (buf != '\0')
1960  {
1962  "Credentials byte was not nul");
1963  return FALSE;
1964  }
1965 
1966  _dbus_verbose ("read credentials byte\n");
1967 
1968  {
1969 #ifdef SO_PEERCRED
1970  /* Supported by at least Linux and OpenBSD, with minor differences.
1971  *
1972  * This mechanism passes the process ID through and does not require
1973  * the peer's cooperation, so we prefer it over all others. Notably,
1974  * Linux also supports SCM_CREDENTIALS, which is similar to FreeBSD
1975  * SCM_CREDS; it's implemented in GIO, but we don't use it in dbus at all,
1976  * because this is much less fragile.
1977  */
1978 #ifdef __OpenBSD__
1979  struct sockpeercred cr;
1980 #else
1981  struct ucred cr;
1982 #endif
1983  int cr_len = sizeof (cr);
1984 
1985  if (getsockopt (client_fd.fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) != 0)
1986  {
1987  _dbus_verbose ("Failed to getsockopt(SO_PEERCRED): %s\n",
1988  _dbus_strerror (errno));
1989  }
1990  else if (cr_len != sizeof (cr))
1991  {
1992  _dbus_verbose ("Failed to getsockopt(SO_PEERCRED), returned %d bytes, expected %d\n",
1993  cr_len, (int) sizeof (cr));
1994  }
1995  else
1996  {
1997  pid_read = cr.pid;
1998  uid_read = cr.uid;
1999  }
2000 #elif defined(HAVE_UNPCBID) && defined(LOCAL_PEEREID)
2001  /* Another variant of the above - used on NetBSD
2002  */
2003  struct unpcbid cr;
2004  socklen_t cr_len = sizeof (cr);
2005 
2006  if (getsockopt (client_fd.fd, 0, LOCAL_PEEREID, &cr, &cr_len) != 0)
2007  {
2008  _dbus_verbose ("Failed to getsockopt(LOCAL_PEEREID): %s\n",
2009  _dbus_strerror (errno));
2010  }
2011  else if (cr_len != sizeof (cr))
2012  {
2013  _dbus_verbose ("Failed to getsockopt(LOCAL_PEEREID), returned %d bytes, expected %d\n",
2014  cr_len, (int) sizeof (cr));
2015  }
2016  else
2017  {
2018  pid_read = cr.unp_pid;
2019  uid_read = cr.unp_euid;
2020  }
2021 #elif defined(HAVE_CMSGCRED)
2022  /* We only check for HAVE_CMSGCRED, but we're really assuming that the
2023  * presence of that struct implies SCM_CREDS. Supported by at least
2024  * FreeBSD and DragonflyBSD.
2025  *
2026  * This mechanism requires the peer to help us (it has to send us a
2027  * SCM_CREDS message) but it does pass the process ID through,
2028  * which makes it better than getpeereid().
2029  */
2030  struct cmsgcred *cred;
2031  struct cmsghdr *cmsgp;
2032 
2033  for (cmsgp = CMSG_FIRSTHDR (&msg);
2034  cmsgp != NULL;
2035  cmsgp = CMSG_NXTHDR (&msg, cmsgp))
2036  {
2037  if (cmsgp->cmsg_type == SCM_CREDS &&
2038  cmsgp->cmsg_level == SOL_SOCKET &&
2039  cmsgp->cmsg_len >= CMSG_LEN (sizeof (struct cmsgcred)))
2040  {
2041  cred = (struct cmsgcred *) CMSG_DATA (cmsgp);
2042  pid_read = cred->cmcred_pid;
2043  uid_read = cred->cmcred_euid;
2044  break;
2045  }
2046  }
2047 
2048 #elif defined(HAVE_GETPEERUCRED)
2049  /* Supported in at least Solaris >= 10. It should probably be higher
2050  * up this list, because it carries the pid and we use this code path
2051  * for audit data. */
2052  ucred_t * ucred = NULL;
2053  if (getpeerucred (client_fd.fd, &ucred) == 0)
2054  {
2055  pid_read = ucred_getpid (ucred);
2056  uid_read = ucred_geteuid (ucred);
2057 #ifdef HAVE_ADT
2058  /* generate audit session data based on socket ucred */
2059  adt_session_data_t *adth = NULL;
2060  adt_export_data_t *data = NULL;
2061  size_t size = 0;
2062  if (adt_start_session (&adth, NULL, 0) || (adth == NULL))
2063  {
2064  _dbus_verbose ("Failed to adt_start_session(): %s\n", _dbus_strerror (errno));
2065  }
2066  else
2067  {
2068  if (adt_set_from_ucred (adth, ucred, ADT_NEW))
2069  {
2070  _dbus_verbose ("Failed to adt_set_from_ucred(): %s\n", _dbus_strerror (errno));
2071  }
2072  else
2073  {
2074  size = adt_export_session_data (adth, &data);
2075  if (size <= 0)
2076  {
2077  _dbus_verbose ("Failed to adt_export_session_data(): %s\n", _dbus_strerror (errno));
2078  }
2079  else
2080  {
2081  _dbus_credentials_add_adt_audit_data (credentials, data, size);
2082  free (data);
2083  }
2084  }
2085  (void) adt_end_session (adth);
2086  }
2087 #endif /* HAVE_ADT */
2088  }
2089  else
2090  {
2091  _dbus_verbose ("Failed to getpeerucred() credentials: %s\n", _dbus_strerror (errno));
2092  }
2093  if (ucred != NULL)
2094  ucred_free (ucred);
2095 
2096  /* ----------------------------------------------------------------
2097  * When adding new mechanisms, please add them above this point
2098  * if they support passing the process ID through, or below if not.
2099  * ---------------------------------------------------------------- */
2100 
2101 #elif defined(HAVE_GETPEEREID)
2102  /* getpeereid() originates from D.J. Bernstein and is fairly
2103  * widely-supported. According to a web search, it might be present in
2104  * any/all of:
2105  *
2106  * - AIX?
2107  * - Blackberry?
2108  * - Cygwin
2109  * - FreeBSD 4.6+ (but we prefer SCM_CREDS: it carries the pid)
2110  * - Mac OS X
2111  * - Minix 3.1.8+
2112  * - MirBSD?
2113  * - NetBSD 5.0+ (but LOCAL_PEEREID would be better: it carries the pid)
2114  * - OpenBSD 3.0+ (but we prefer SO_PEERCRED: it carries the pid)
2115  * - QNX?
2116  */
2117  uid_t euid;
2118  gid_t egid;
2119  if (getpeereid (client_fd.fd, &euid, &egid) == 0)
2120  {
2121  uid_read = euid;
2122  }
2123  else
2124  {
2125  _dbus_verbose ("Failed to getpeereid() credentials: %s\n", _dbus_strerror (errno));
2126  }
2127 #else /* no supported mechanism */
2128 
2129 #warning Socket credentials not supported on this Unix OS
2130 #warning Please tell https://bugs.freedesktop.org/enter_bug.cgi?product=DBus
2131 
2132  /* Please add other operating systems known to support at least one of
2133  * the mechanisms above to this list, keeping alphabetical order.
2134  * Everything not in this list is best-effort.
2135  */
2136 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
2137  defined(__linux__) || \
2138  defined(__OpenBSD__) || \
2139  defined(__NetBSD__)
2140 # error Credentials passing not working on this OS is a regression!
2141 #endif
2142 
2143  _dbus_verbose ("Socket credentials not supported on this OS\n");
2144 #endif
2145  }
2146 
2147  _dbus_verbose ("Credentials:"
2148  " pid "DBUS_PID_FORMAT
2149  " uid "DBUS_UID_FORMAT
2150  "\n",
2151  pid_read,
2152  uid_read);
2153 
2154  if (pid_read != DBUS_PID_UNSET)
2155  {
2156  if (!_dbus_credentials_add_pid (credentials, pid_read))
2157  {
2158  _DBUS_SET_OOM (error);
2159  return FALSE;
2160  }
2161  }
2162 
2163  if (uid_read != DBUS_UID_UNSET)
2164  {
2165  if (!_dbus_credentials_add_unix_uid (credentials, uid_read))
2166  {
2167  _DBUS_SET_OOM (error);
2168  return FALSE;
2169  }
2170  }
2171 
2172  if (!add_linux_security_label_to_credentials (client_fd.fd, credentials))
2173  {
2174  _DBUS_SET_OOM (error);
2175  return FALSE;
2176  }
2177 
2178  return TRUE;
2179 }
2180 
2200  DBusError *error)
2201 {
2202  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2203 
2204  if (write_credentials_byte (server_fd.fd, error))
2205  return TRUE;
2206  else
2207  return FALSE;
2208 }
2209 
2219 DBusSocket
2221 {
2222  DBusSocket client_fd;
2223  struct sockaddr addr;
2224  socklen_t addrlen;
2225 #ifdef HAVE_ACCEPT4
2226  dbus_bool_t cloexec_done;
2227 #endif
2228 
2229  addrlen = sizeof (addr);
2230 
2231  retry:
2232 
2233 #ifdef HAVE_ACCEPT4
2234  /*
2235  * At compile-time, we assume that if accept4() is available in
2236  * libc headers, SOCK_CLOEXEC is too. At runtime, it is still
2237  * not necessarily true that either is supported by the running kernel.
2238  */
2239  client_fd.fd = accept4 (listen_fd.fd, &addr, &addrlen, SOCK_CLOEXEC);
2240  cloexec_done = client_fd.fd >= 0;
2241 
2242  if (client_fd.fd < 0 && (errno == ENOSYS || errno == EINVAL))
2243 #endif
2244  {
2245  client_fd.fd = accept (listen_fd.fd, &addr, &addrlen);
2246  }
2247 
2248  if (client_fd.fd < 0)
2249  {
2250  if (errno == EINTR)
2251  goto retry;
2252  }
2253 
2254  _dbus_verbose ("client fd %d accepted\n", client_fd.fd);
2255 
2256 #ifdef HAVE_ACCEPT4
2257  if (!cloexec_done)
2258 #endif
2259  {
2260  _dbus_fd_set_close_on_exec(client_fd.fd);
2261  }
2262 
2263  return client_fd;
2264 }
2265 
2276 {
2277  const char *directory;
2278  struct stat sb;
2279 
2280  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2281 
2282  directory = _dbus_string_get_const_data (dir);
2283 
2284  if (stat (directory, &sb) < 0)
2285  {
2286  dbus_set_error (error, _dbus_error_from_errno (errno),
2287  "%s", _dbus_strerror (errno));
2288 
2289  return FALSE;
2290  }
2291 
2292  if (sb.st_uid != geteuid ())
2293  {
2295  "%s directory is owned by user %lu, not %lu",
2296  directory,
2297  (unsigned long) sb.st_uid,
2298  (unsigned long) geteuid ());
2299  return FALSE;
2300  }
2301 
2302  if ((S_IROTH & sb.st_mode) || (S_IWOTH & sb.st_mode) ||
2303  (S_IRGRP & sb.st_mode) || (S_IWGRP & sb.st_mode))
2304  {
2306  "%s directory is not private to the user", directory);
2307  return FALSE;
2308  }
2309 
2310  return TRUE;
2311 }
2312 
2313 static dbus_bool_t
2314 fill_user_info_from_passwd (struct passwd *p,
2315  DBusUserInfo *info,
2316  DBusError *error)
2317 {
2318  _dbus_assert (p->pw_name != NULL);
2319  _dbus_assert (p->pw_dir != NULL);
2320 
2321  info->uid = p->pw_uid;
2322  info->primary_gid = p->pw_gid;
2323  info->username = _dbus_strdup (p->pw_name);
2324  info->homedir = _dbus_strdup (p->pw_dir);
2325 
2326  if (info->username == NULL ||
2327  info->homedir == NULL)
2328  {
2330  return FALSE;
2331  }
2332 
2333  return TRUE;
2334 }
2335 
2336 static dbus_bool_t
2337 fill_user_info (DBusUserInfo *info,
2338  dbus_uid_t uid,
2339  const DBusString *username,
2340  DBusError *error)
2341 {
2342  const char *username_c;
2343 
2344  /* exactly one of username/uid provided */
2345  _dbus_assert (username != NULL || uid != DBUS_UID_UNSET);
2346  _dbus_assert (username == NULL || uid == DBUS_UID_UNSET);
2347 
2348  info->uid = DBUS_UID_UNSET;
2349  info->primary_gid = DBUS_GID_UNSET;
2350  info->group_ids = NULL;
2351  info->n_group_ids = 0;
2352  info->username = NULL;
2353  info->homedir = NULL;
2354 
2355  if (username != NULL)
2356  username_c = _dbus_string_get_const_data (username);
2357  else
2358  username_c = NULL;
2359 
2360  /* For now assuming that the getpwnam() and getpwuid() flavors
2361  * are always symmetrical, if not we have to add more configure
2362  * checks
2363  */
2364 
2365 #if defined (HAVE_POSIX_GETPWNAM_R) || defined (HAVE_NONPOSIX_GETPWNAM_R)
2366  {
2367  struct passwd *p;
2368  int result;
2369  size_t buflen;
2370  char *buf;
2371  struct passwd p_str;
2372 
2373  /* retrieve maximum needed size for buf */
2374  buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
2375 
2376  /* sysconf actually returns a long, but everything else expects size_t,
2377  * so just recast here.
2378  * https://bugs.freedesktop.org/show_bug.cgi?id=17061
2379  */
2380  if ((long) buflen <= 0)
2381  buflen = 1024;
2382 
2383  result = -1;
2384  while (1)
2385  {
2386  buf = dbus_malloc (buflen);
2387  if (buf == NULL)
2388  {
2390  return FALSE;
2391  }
2392 
2393  p = NULL;
2394 #ifdef HAVE_POSIX_GETPWNAM_R
2395  if (uid != DBUS_UID_UNSET)
2396  result = getpwuid_r (uid, &p_str, buf, buflen,
2397  &p);
2398  else
2399  result = getpwnam_r (username_c, &p_str, buf, buflen,
2400  &p);
2401 #else
2402  if (uid != DBUS_UID_UNSET)
2403  p = getpwuid_r (uid, &p_str, buf, buflen);
2404  else
2405  p = getpwnam_r (username_c, &p_str, buf, buflen);
2406  result = 0;
2407 #endif /* !HAVE_POSIX_GETPWNAM_R */
2408  //Try a bigger buffer if ERANGE was returned
2409  if (result == ERANGE && buflen < 512 * 1024)
2410  {
2411  dbus_free (buf);
2412  buflen *= 2;
2413  }
2414  else
2415  {
2416  break;
2417  }
2418  }
2419  if (result == 0 && p == &p_str)
2420  {
2421  if (!fill_user_info_from_passwd (p, info, error))
2422  {
2423  dbus_free (buf);
2424  return FALSE;
2425  }
2426  dbus_free (buf);
2427  }
2428  else
2429  {
2430  dbus_set_error (error, _dbus_error_from_errno (errno),
2431  "User \"%s\" unknown or no memory to allocate password entry\n",
2432  username_c ? username_c : "???");
2433  _dbus_verbose ("User %s unknown\n", username_c ? username_c : "???");
2434  dbus_free (buf);
2435  return FALSE;
2436  }
2437  }
2438 #else /* ! HAVE_GETPWNAM_R */
2439  {
2440  /* I guess we're screwed on thread safety here */
2441  struct passwd *p;
2442 
2443  if (uid != DBUS_UID_UNSET)
2444  p = getpwuid (uid);
2445  else
2446  p = getpwnam (username_c);
2447 
2448  if (p != NULL)
2449  {
2450  if (!fill_user_info_from_passwd (p, info, error))
2451  {
2452  return FALSE;
2453  }
2454  }
2455  else
2456  {
2457  dbus_set_error (error, _dbus_error_from_errno (errno),
2458  "User \"%s\" unknown or no memory to allocate password entry\n",
2459  username_c ? username_c : "???");
2460  _dbus_verbose ("User %s unknown\n", username_c ? username_c : "???");
2461  return FALSE;
2462  }
2463  }
2464 #endif /* ! HAVE_GETPWNAM_R */
2465 
2466  /* Fill this in so we can use it to get groups */
2467  username_c = info->username;
2468 
2469 #ifdef HAVE_GETGROUPLIST
2470  {
2471  gid_t *buf;
2472  int buf_count;
2473  int i;
2474  int initial_buf_count;
2475 
2476  initial_buf_count = 17;
2477  buf_count = initial_buf_count;
2478  buf = dbus_new (gid_t, buf_count);
2479  if (buf == NULL)
2480  {
2482  goto failed;
2483  }
2484 
2485  if (getgrouplist (username_c,
2486  info->primary_gid,
2487  buf, &buf_count) < 0)
2488  {
2489  gid_t *new;
2490  /* Presumed cause of negative return code: buf has insufficient
2491  entries to hold the entire group list. The Linux behavior in this
2492  case is to pass back the actual number of groups in buf_count, but
2493  on Mac OS X 10.5, buf_count is unhelpfully left alone.
2494  So as a hack, try to help out a bit by guessing a larger
2495  number of groups, within reason.. might still fail, of course,
2496  but we can at least print a more informative message. I looked up
2497  the "right way" to do this by downloading Apple's own source code
2498  for the "id" command, and it turns out that they use an
2499  undocumented library function getgrouplist_2 (!) which is not
2500  declared in any header in /usr/include (!!). That did not seem
2501  like the way to go here.
2502  */
2503  if (buf_count == initial_buf_count)
2504  {
2505  buf_count *= 16; /* Retry with an arbitrarily scaled-up array */
2506  }
2507  new = dbus_realloc (buf, buf_count * sizeof (buf[0]));
2508  if (new == NULL)
2509  {
2511  dbus_free (buf);
2512  goto failed;
2513  }
2514 
2515  buf = new;
2516 
2517  errno = 0;
2518  if (getgrouplist (username_c, info->primary_gid, buf, &buf_count) < 0)
2519  {
2520  if (errno == 0)
2521  {
2522  _dbus_warn ("It appears that username \"%s\" is in more than %d groups.\nProceeding with just the first %d groups.",
2523  username_c, buf_count, buf_count);
2524  }
2525  else
2526  {
2527  dbus_set_error (error,
2528  _dbus_error_from_errno (errno),
2529  "Failed to get groups for username \"%s\" primary GID "
2530  DBUS_GID_FORMAT ": %s\n",
2531  username_c, info->primary_gid,
2532  _dbus_strerror (errno));
2533  dbus_free (buf);
2534  goto failed;
2535  }
2536  }
2537  }
2538 
2539  info->group_ids = dbus_new (dbus_gid_t, buf_count);
2540  if (info->group_ids == NULL)
2541  {
2543  dbus_free (buf);
2544  goto failed;
2545  }
2546 
2547  for (i = 0; i < buf_count; ++i)
2548  info->group_ids[i] = buf[i];
2549 
2550  info->n_group_ids = buf_count;
2551 
2552  dbus_free (buf);
2553  }
2554 #else /* HAVE_GETGROUPLIST */
2555  {
2556  /* We just get the one group ID */
2557  info->group_ids = dbus_new (dbus_gid_t, 1);
2558  if (info->group_ids == NULL)
2559  {
2561  goto failed;
2562  }
2563 
2564  info->n_group_ids = 1;
2565 
2566  (info->group_ids)[0] = info->primary_gid;
2567  }
2568 #endif /* HAVE_GETGROUPLIST */
2569 
2570  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2571 
2572  return TRUE;
2573 
2574  failed:
2575  _DBUS_ASSERT_ERROR_IS_SET (error);
2576  return FALSE;
2577 }
2578 
2589  const DBusString *username,
2590  DBusError *error)
2591 {
2592  return fill_user_info (info, DBUS_UID_UNSET,
2593  username, error);
2594 }
2595 
2606  dbus_uid_t uid,
2607  DBusError *error)
2608 {
2609  return fill_user_info (info, uid,
2610  NULL, error);
2611 }
2612 
2622 {
2623  /* The POSIX spec certainly doesn't promise this, but
2624  * we need these assertions to fail as soon as we're wrong about
2625  * it so we can do the porting fixups
2626  */
2627  _DBUS_STATIC_ASSERT (sizeof (pid_t) <= sizeof (dbus_pid_t));
2628  _DBUS_STATIC_ASSERT (sizeof (uid_t) <= sizeof (dbus_uid_t));
2629  _DBUS_STATIC_ASSERT (sizeof (gid_t) <= sizeof (dbus_gid_t));
2630 
2631  if (!_dbus_credentials_add_pid(credentials, _dbus_getpid()))
2632  return FALSE;
2633  if (!_dbus_credentials_add_unix_uid(credentials, _dbus_geteuid()))
2634  return FALSE;
2635 
2636  return TRUE;
2637 }
2638 
2652 {
2653  return _dbus_string_append_uint (str,
2654  _dbus_geteuid ());
2655 }
2656 
2661 dbus_pid_t
2663 {
2664  return getpid ();
2665 }
2666 
2670 dbus_uid_t
2672 {
2673  return getuid ();
2674 }
2675 
2679 dbus_uid_t
2681 {
2682  return geteuid ();
2683 }
2684 
2691 unsigned long
2693 {
2694  return getpid ();
2695 }
2696 
2705 _dbus_parse_uid (const DBusString *uid_str,
2706  dbus_uid_t *uid)
2707 {
2708  int end;
2709  long val;
2710 
2711  if (_dbus_string_get_length (uid_str) == 0)
2712  {
2713  _dbus_verbose ("UID string was zero length\n");
2714  return FALSE;
2715  }
2716 
2717  val = -1;
2718  end = 0;
2719  if (!_dbus_string_parse_int (uid_str, 0, &val,
2720  &end))
2721  {
2722  _dbus_verbose ("could not parse string as a UID\n");
2723  return FALSE;
2724  }
2725 
2726  if (end != _dbus_string_get_length (uid_str))
2727  {
2728  _dbus_verbose ("string contained trailing stuff after UID\n");
2729  return FALSE;
2730  }
2731 
2732  *uid = val;
2733 
2734  return TRUE;
2735 }
2736 
2737 #if !DBUS_USE_SYNC
2738 /* To be thread-safe by default on platforms that don't necessarily have
2739  * atomic operations (notably Debian armel, which is armv4t), we must
2740  * use a mutex that can be initialized statically, like this.
2741  * GLib >= 2.32 uses a similar system.
2742  */
2743 static pthread_mutex_t atomic_mutex = PTHREAD_MUTEX_INITIALIZER;
2744 #endif
2745 
2752 dbus_int32_t
2754 {
2755 #if DBUS_USE_SYNC
2756  return __sync_add_and_fetch(&atomic->value, 1)-1;
2757 #else
2758  dbus_int32_t res;
2759 
2760  pthread_mutex_lock (&atomic_mutex);
2761  res = atomic->value;
2762  atomic->value += 1;
2763  pthread_mutex_unlock (&atomic_mutex);
2764 
2765  return res;
2766 #endif
2767 }
2768 
2775 dbus_int32_t
2777 {
2778 #if DBUS_USE_SYNC
2779  return __sync_sub_and_fetch(&atomic->value, 1)+1;
2780 #else
2781  dbus_int32_t res;
2782 
2783  pthread_mutex_lock (&atomic_mutex);
2784  res = atomic->value;
2785  atomic->value -= 1;
2786  pthread_mutex_unlock (&atomic_mutex);
2787 
2788  return res;
2789 #endif
2790 }
2791 
2799 dbus_int32_t
2801 {
2802 #if DBUS_USE_SYNC
2803  __sync_synchronize ();
2804  return atomic->value;
2805 #else
2806  dbus_int32_t res;
2807 
2808  pthread_mutex_lock (&atomic_mutex);
2809  res = atomic->value;
2810  pthread_mutex_unlock (&atomic_mutex);
2811 
2812  return res;
2813 #endif
2814 }
2815 
2824 int
2826  int n_fds,
2827  int timeout_milliseconds)
2828 {
2829 #if defined(HAVE_POLL) && !defined(BROKEN_POLL)
2830  /* DBusPollFD is a struct pollfd in this code path, so we can just poll() */
2831  if (timeout_milliseconds < -1)
2832  {
2833  timeout_milliseconds = -1;
2834  }
2835 
2836  return poll (fds,
2837  n_fds,
2838  timeout_milliseconds);
2839 #else /* ! HAVE_POLL */
2840  /* Emulate poll() in terms of select() */
2841  fd_set read_set, write_set, err_set;
2842  int max_fd = 0;
2843  int i;
2844  struct timeval tv;
2845  int ready;
2846 
2847  FD_ZERO (&read_set);
2848  FD_ZERO (&write_set);
2849  FD_ZERO (&err_set);
2850 
2851  for (i = 0; i < n_fds; i++)
2852  {
2853  DBusPollFD *fdp = &fds[i];
2854 
2855  if (fdp->events & _DBUS_POLLIN)
2856  FD_SET (fdp->fd, &read_set);
2857 
2858  if (fdp->events & _DBUS_POLLOUT)
2859  FD_SET (fdp->fd, &write_set);
2860 
2861  FD_SET (fdp->fd, &err_set);
2862 
2863  max_fd = MAX (max_fd, fdp->fd);
2864  }
2865 
2866  tv.tv_sec = timeout_milliseconds / 1000;
2867  tv.tv_usec = (timeout_milliseconds % 1000) * 1000;
2868 
2869  ready = select (max_fd + 1, &read_set, &write_set, &err_set,
2870  timeout_milliseconds < 0 ? NULL : &tv);
2871 
2872  if (ready > 0)
2873  {
2874  for (i = 0; i < n_fds; i++)
2875  {
2876  DBusPollFD *fdp = &fds[i];
2877 
2878  fdp->revents = 0;
2879 
2880  if (FD_ISSET (fdp->fd, &read_set))
2881  fdp->revents |= _DBUS_POLLIN;
2882 
2883  if (FD_ISSET (fdp->fd, &write_set))
2884  fdp->revents |= _DBUS_POLLOUT;
2885 
2886  if (FD_ISSET (fdp->fd, &err_set))
2887  fdp->revents |= _DBUS_POLLERR;
2888  }
2889  }
2890 
2891  return ready;
2892 #endif
2893 }
2894 
2902 void
2904  long *tv_usec)
2905 {
2906 #ifdef HAVE_MONOTONIC_CLOCK
2907  struct timespec ts;
2908  clock_gettime (CLOCK_MONOTONIC, &ts);
2909 
2910  if (tv_sec)
2911  *tv_sec = ts.tv_sec;
2912  if (tv_usec)
2913  *tv_usec = ts.tv_nsec / 1000;
2914 #else
2915  struct timeval t;
2916 
2917  gettimeofday (&t, NULL);
2918 
2919  if (tv_sec)
2920  *tv_sec = t.tv_sec;
2921  if (tv_usec)
2922  *tv_usec = t.tv_usec;
2923 #endif
2924 }
2925 
2933 void
2934 _dbus_get_real_time (long *tv_sec,
2935  long *tv_usec)
2936 {
2937  struct timeval t;
2938 
2939  gettimeofday (&t, NULL);
2940 
2941  if (tv_sec)
2942  *tv_sec = t.tv_sec;
2943  if (tv_usec)
2944  *tv_usec = t.tv_usec;
2945 }
2946 
2957  DBusError *error)
2958 {
2959  const char *filename_c;
2960 
2961  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2962 
2963  filename_c = _dbus_string_get_const_data (filename);
2964 
2965  if (mkdir (filename_c, 0700) < 0)
2966  {
2967  if (errno == EEXIST)
2968  return TRUE;
2969 
2971  "Failed to create directory %s: %s\n",
2972  filename_c, _dbus_strerror (errno));
2973  return FALSE;
2974  }
2975  else
2976  return TRUE;
2977 }
2978 
2991  const DBusString *next_component)
2992 {
2993  dbus_bool_t dir_ends_in_slash;
2994  dbus_bool_t file_starts_with_slash;
2995 
2996  if (_dbus_string_get_length (dir) == 0 ||
2997  _dbus_string_get_length (next_component) == 0)
2998  return TRUE;
2999 
3000  dir_ends_in_slash = '/' == _dbus_string_get_byte (dir,
3001  _dbus_string_get_length (dir) - 1);
3002 
3003  file_starts_with_slash = '/' == _dbus_string_get_byte (next_component, 0);
3004 
3005  if (dir_ends_in_slash && file_starts_with_slash)
3006  {
3007  _dbus_string_shorten (dir, 1);
3008  }
3009  else if (!(dir_ends_in_slash || file_starts_with_slash))
3010  {
3011  if (!_dbus_string_append_byte (dir, '/'))
3012  return FALSE;
3013  }
3014 
3015  return _dbus_string_copy (next_component, 0, dir,
3016  _dbus_string_get_length (dir));
3017 }
3018 
3020 #define NANOSECONDS_PER_SECOND 1000000000
3021 
3022 #define MICROSECONDS_PER_SECOND 1000000
3023 
3024 #define MILLISECONDS_PER_SECOND 1000
3025 
3026 #define NANOSECONDS_PER_MILLISECOND 1000000
3027 
3028 #define MICROSECONDS_PER_MILLISECOND 1000
3029 
3034 void
3035 _dbus_sleep_milliseconds (int milliseconds)
3036 {
3037 #ifdef HAVE_NANOSLEEP
3038  struct timespec req;
3039  struct timespec rem;
3040 
3041  req.tv_sec = milliseconds / MILLISECONDS_PER_SECOND;
3042  req.tv_nsec = (milliseconds % MILLISECONDS_PER_SECOND) * NANOSECONDS_PER_MILLISECOND;
3043  rem.tv_sec = 0;
3044  rem.tv_nsec = 0;
3045 
3046  while (nanosleep (&req, &rem) < 0 && errno == EINTR)
3047  req = rem;
3048 #elif defined (HAVE_USLEEP)
3049  usleep (milliseconds * MICROSECONDS_PER_MILLISECOND);
3050 #else /* ! HAVE_USLEEP */
3051  sleep (MAX (milliseconds / 1000, 1));
3052 #endif
3053 }
3054 
3066  int n_bytes,
3067  DBusError *error)
3068 {
3069  int old_len;
3070  int fd;
3071  int result;
3072 
3073  old_len = _dbus_string_get_length (str);
3074  fd = -1;
3075 
3076  /* note, urandom on linux will fall back to pseudorandom */
3077  fd = open ("/dev/urandom", O_RDONLY);
3078 
3079  if (fd < 0)
3080  {
3081  dbus_set_error (error, _dbus_error_from_errno (errno),
3082  "Could not open /dev/urandom: %s",
3083  _dbus_strerror (errno));
3084  return FALSE;
3085  }
3086 
3087  _dbus_verbose ("/dev/urandom fd %d opened\n", fd);
3088 
3089  result = _dbus_read (fd, str, n_bytes);
3090 
3091  if (result != n_bytes)
3092  {
3093  if (result < 0)
3094  dbus_set_error (error, _dbus_error_from_errno (errno),
3095  "Could not read /dev/urandom: %s",
3096  _dbus_strerror (errno));
3097  else
3099  "Short read from /dev/urandom");
3100 
3101  _dbus_close (fd, NULL);
3102  _dbus_string_set_length (str, old_len);
3103  return FALSE;
3104  }
3105 
3106  _dbus_verbose ("Read %d bytes from /dev/urandom\n",
3107  n_bytes);
3108 
3109  _dbus_close (fd, NULL);
3110 
3111  return TRUE;
3112 }
3113 
3119 void
3120 _dbus_exit (int code)
3121 {
3122  _exit (code);
3123 }
3124 
3133 const char*
3134 _dbus_strerror (int error_number)
3135 {
3136  const char *msg;
3137 
3138  msg = strerror (error_number);
3139  if (msg == NULL)
3140  msg = "unknown";
3141 
3142  return msg;
3143 }
3144 
3148 void
3150 {
3151  signal (SIGPIPE, SIG_IGN);
3152 }
3153 
3161 void
3163 {
3164  int val;
3165 
3166  val = fcntl (fd, F_GETFD, 0);
3167 
3168  if (val < 0)
3169  return;
3170 
3171  val |= FD_CLOEXEC;
3172 
3173  fcntl (fd, F_SETFD, val);
3174 }
3175 
3184 _dbus_close (int fd,
3185  DBusError *error)
3186 {
3187  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3188 
3189  again:
3190  if (close (fd) < 0)
3191  {
3192  if (errno == EINTR)
3193  goto again;
3194 
3195  dbus_set_error (error, _dbus_error_from_errno (errno),
3196  "Could not close fd %d", fd);
3197  return FALSE;
3198  }
3199 
3200  return TRUE;
3201 }
3202 
3211 int
3212 _dbus_dup(int fd,
3213  DBusError *error)
3214 {
3215  int new_fd;
3216 
3217 #ifdef F_DUPFD_CLOEXEC
3218  dbus_bool_t cloexec_done;
3219 
3220  new_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
3221  cloexec_done = new_fd >= 0;
3222 
3223  if (new_fd < 0 && errno == EINVAL)
3224 #endif
3225  {
3226  new_fd = fcntl(fd, F_DUPFD, 3);
3227  }
3228 
3229  if (new_fd < 0) {
3230 
3231  dbus_set_error (error, _dbus_error_from_errno (errno),
3232  "Could not duplicate fd %d", fd);
3233  return -1;
3234  }
3235 
3236 #ifdef F_DUPFD_CLOEXEC
3237  if (!cloexec_done)
3238 #endif
3239  {
3241  }
3242 
3243  return new_fd;
3244 }
3245 
3255  DBusError *error)
3256 {
3257  return _dbus_set_fd_nonblocking (fd.fd, error);
3258 }
3259 
3260 static dbus_bool_t
3261 _dbus_set_fd_nonblocking (int fd,
3262  DBusError *error)
3263 {
3264  int val;
3265 
3266  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3267 
3268  val = fcntl (fd, F_GETFL, 0);
3269  if (val < 0)
3270  {
3271  dbus_set_error (error, _dbus_error_from_errno (errno),
3272  "Failed to get flags from file descriptor %d: %s",
3273  fd, _dbus_strerror (errno));
3274  _dbus_verbose ("Failed to get flags for fd %d: %s\n", fd,
3275  _dbus_strerror (errno));
3276  return FALSE;
3277  }
3278 
3279  if (fcntl (fd, F_SETFL, val | O_NONBLOCK) < 0)
3280  {
3281  dbus_set_error (error, _dbus_error_from_errno (errno),
3282  "Failed to set nonblocking flag of file descriptor %d: %s",
3283  fd, _dbus_strerror (errno));
3284  _dbus_verbose ("Failed to set fd %d nonblocking: %s\n",
3285  fd, _dbus_strerror (errno));
3286 
3287  return FALSE;
3288  }
3289 
3290  return TRUE;
3291 }
3292 
3298 void
3300 {
3301 #if defined (HAVE_BACKTRACE) && defined (DBUS_BUILT_R_DYNAMIC)
3302  void *bt[500];
3303  int bt_size;
3304  int i;
3305  char **syms;
3306 
3307  bt_size = backtrace (bt, 500);
3308 
3309  syms = backtrace_symbols (bt, bt_size);
3310 
3311  i = 0;
3312  while (i < bt_size)
3313  {
3314  /* don't use dbus_warn since it can _dbus_abort() */
3315  fprintf (stderr, " %s\n", syms[i]);
3316  ++i;
3317  }
3318  fflush (stderr);
3319 
3320  free (syms);
3321 #elif defined (HAVE_BACKTRACE) && ! defined (DBUS_BUILT_R_DYNAMIC)
3322  fprintf (stderr, " D-Bus not built with -rdynamic so unable to print a backtrace\n");
3323 #else
3324  fprintf (stderr, " D-Bus not compiled with backtrace support so unable to print a backtrace\n");
3325 #endif
3326 }
3327 
3342  DBusSocket *fd2,
3343  dbus_bool_t blocking,
3344  DBusError *error)
3345 {
3346 #ifdef HAVE_SOCKETPAIR
3347  int fds[2];
3348  int retval;
3349 
3350 #ifdef SOCK_CLOEXEC
3351  dbus_bool_t cloexec_done;
3352 
3353  retval = socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, fds);
3354  cloexec_done = retval >= 0;
3355 
3356  if (retval < 0 && (errno == EINVAL || errno == EPROTOTYPE))
3357 #endif
3358  {
3359  retval = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
3360  }
3361 
3362  if (retval < 0)
3363  {
3364  dbus_set_error (error, _dbus_error_from_errno (errno),
3365  "Could not create full-duplex pipe");
3366  return FALSE;
3367  }
3368 
3369  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3370 
3371 #ifdef SOCK_CLOEXEC
3372  if (!cloexec_done)
3373 #endif
3374  {
3375  _dbus_fd_set_close_on_exec (fds[0]);
3376  _dbus_fd_set_close_on_exec (fds[1]);
3377  }
3378 
3379  if (!blocking &&
3380  (!_dbus_set_fd_nonblocking (fds[0], NULL) ||
3381  !_dbus_set_fd_nonblocking (fds[1], NULL)))
3382  {
3383  dbus_set_error (error, _dbus_error_from_errno (errno),
3384  "Could not set full-duplex pipe nonblocking");
3385 
3386  _dbus_close (fds[0], NULL);
3387  _dbus_close (fds[1], NULL);
3388 
3389  return FALSE;
3390  }
3391 
3392  fd1->fd = fds[0];
3393  fd2->fd = fds[1];
3394 
3395  _dbus_verbose ("full-duplex pipe %d <-> %d\n",
3396  fd1->fd, fd2->fd);
3397 
3398  return TRUE;
3399 #else
3400  _dbus_warn ("_dbus_socketpair() not implemented on this OS\n");
3402  "_dbus_socketpair() not implemented on this OS");
3403  return FALSE;
3404 #endif
3405 }
3406 
3415 int
3417  va_list args)
3418 {
3419  char static_buf[1024];
3420  int bufsize = sizeof (static_buf);
3421  int len;
3422  va_list args_copy;
3423 
3424  DBUS_VA_COPY (args_copy, args);
3425  len = vsnprintf (static_buf, bufsize, format, args_copy);
3426  va_end (args_copy);
3427 
3428  /* If vsnprintf() returned non-negative, then either the string fits in
3429  * static_buf, or this OS has the POSIX and C99 behaviour where vsnprintf
3430  * returns the number of characters that were needed, or this OS returns the
3431  * truncated length.
3432  *
3433  * We ignore the possibility that snprintf might just ignore the length and
3434  * overrun the buffer (64-bit Solaris 7), because that's pathological.
3435  * If your libc is really that bad, come back when you have a better one. */
3436  if (len == bufsize)
3437  {
3438  /* This could be the truncated length (Tru64 and IRIX have this bug),
3439  * or the real length could be coincidentally the same. Which is it?
3440  * If vsnprintf returns the truncated length, we'll go to the slow
3441  * path. */
3442  DBUS_VA_COPY (args_copy, args);
3443 
3444  if (vsnprintf (static_buf, 1, format, args_copy) == 1)
3445  len = -1;
3446 
3447  va_end (args_copy);
3448  }
3449 
3450  /* If vsnprintf() returned negative, we have to do more work.
3451  * HP-UX returns negative. */
3452  while (len < 0)
3453  {
3454  char *buf;
3455 
3456  bufsize *= 2;
3457 
3458  buf = dbus_malloc (bufsize);
3459 
3460  if (buf == NULL)
3461  return -1;
3462 
3463  DBUS_VA_COPY (args_copy, args);
3464  len = vsnprintf (buf, bufsize, format, args_copy);
3465  va_end (args_copy);
3466 
3467  dbus_free (buf);
3468 
3469  /* If the reported length is exactly the buffer size, round up to the
3470  * next size, in case vsnprintf has been returning the truncated
3471  * length */
3472  if (len == bufsize)
3473  len = -1;
3474  }
3475 
3476  return len;
3477 }
3478 
3485 const char*
3487 {
3488  /* Protected by _DBUS_LOCK_sysdeps */
3489  static const char* tmpdir = NULL;
3490 
3491  if (!_DBUS_LOCK (sysdeps))
3492  return NULL;
3493 
3494  if (tmpdir == NULL)
3495  {
3496  /* TMPDIR is what glibc uses, then
3497  * glibc falls back to the P_tmpdir macro which
3498  * just expands to "/tmp"
3499  */
3500  if (tmpdir == NULL)
3501  tmpdir = getenv("TMPDIR");
3502 
3503  /* These two env variables are probably
3504  * broken, but maybe some OS uses them?
3505  */
3506  if (tmpdir == NULL)
3507  tmpdir = getenv("TMP");
3508  if (tmpdir == NULL)
3509  tmpdir = getenv("TEMP");
3510 
3511  /* And this is the sane fallback. */
3512  if (tmpdir == NULL)
3513  tmpdir = "/tmp";
3514  }
3515 
3516  _DBUS_UNLOCK (sysdeps);
3517 
3518  _dbus_assert(tmpdir != NULL);
3519 
3520  return tmpdir;
3521 }
3522 
3523 #if defined(DBUS_ENABLE_X11_AUTOLAUNCH) || defined(DBUS_ENABLE_LAUNCHD)
3524 
3543 static dbus_bool_t
3544 _read_subprocess_line_argv (const char *progpath,
3545  dbus_bool_t path_fallback,
3546  char * const *argv,
3547  DBusString *result,
3548  DBusError *error)
3549 {
3550  int result_pipe[2] = { -1, -1 };
3551  int errors_pipe[2] = { -1, -1 };
3552  pid_t pid;
3553  int ret;
3554  int status;
3555  int orig_len;
3556 
3557  dbus_bool_t retval;
3558  sigset_t new_set, old_set;
3559 
3560  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3561  retval = FALSE;
3562 
3563  /* We need to block any existing handlers for SIGCHLD temporarily; they
3564  * will cause waitpid() below to fail.
3565  * https://bugs.freedesktop.org/show_bug.cgi?id=21347
3566  */
3567  sigemptyset (&new_set);
3568  sigaddset (&new_set, SIGCHLD);
3569  sigprocmask (SIG_BLOCK, &new_set, &old_set);
3570 
3571  orig_len = _dbus_string_get_length (result);
3572 
3573 #define READ_END 0
3574 #define WRITE_END 1
3575  if (pipe (result_pipe) < 0)
3576  {
3577  dbus_set_error (error, _dbus_error_from_errno (errno),
3578  "Failed to create a pipe to call %s: %s",
3579  progpath, _dbus_strerror (errno));
3580  _dbus_verbose ("Failed to create a pipe to call %s: %s\n",
3581  progpath, _dbus_strerror (errno));
3582  goto out;
3583  }
3584  if (pipe (errors_pipe) < 0)
3585  {
3586  dbus_set_error (error, _dbus_error_from_errno (errno),
3587  "Failed to create a pipe to call %s: %s",
3588  progpath, _dbus_strerror (errno));
3589  _dbus_verbose ("Failed to create a pipe to call %s: %s\n",
3590  progpath, _dbus_strerror (errno));
3591  goto out;
3592  }
3593 
3594  pid = fork ();
3595  if (pid < 0)
3596  {
3597  dbus_set_error (error, _dbus_error_from_errno (errno),
3598  "Failed to fork() to call %s: %s",
3599  progpath, _dbus_strerror (errno));
3600  _dbus_verbose ("Failed to fork() to call %s: %s\n",
3601  progpath, _dbus_strerror (errno));
3602  goto out;
3603  }
3604 
3605  if (pid == 0)
3606  {
3607  /* child process */
3608  int fd;
3609 
3610  fd = open ("/dev/null", O_RDWR);
3611  if (fd == -1)
3612  /* huh?! can't open /dev/null? */
3613  _exit (1);
3614 
3615  _dbus_verbose ("/dev/null fd %d opened\n", fd);
3616 
3617  /* set-up stdXXX */
3618  close (result_pipe[READ_END]);
3619  close (errors_pipe[READ_END]);
3620 
3621  if (dup2 (fd, 0) == -1) /* setup stdin */
3622  _exit (1);
3623  if (dup2 (result_pipe[WRITE_END], 1) == -1) /* setup stdout */
3624  _exit (1);
3625  if (dup2 (errors_pipe[WRITE_END], 2) == -1) /* setup stderr */
3626  _exit (1);
3627 
3628  _dbus_close_all ();
3629 
3630  sigprocmask (SIG_SETMASK, &old_set, NULL);
3631 
3632  /* If it looks fully-qualified, try execv first */
3633  if (progpath[0] == '/')
3634  {
3635  execv (progpath, argv);
3636  /* Ok, that failed. Now if path_fallback is given, let's
3637  * try unqualified. This is mostly a hack to work
3638  * around systems which ship dbus-launch in /usr/bin
3639  * but everything else in /bin (because dbus-launch
3640  * depends on X11).
3641  */
3642  if (path_fallback)
3643  /* We must have a slash, because we checked above */
3644  execvp (strrchr (progpath, '/')+1, argv);
3645  }
3646  else
3647  execvp (progpath, argv);
3648 
3649  /* still nothing, we failed */
3650  _exit (1);
3651  }
3652 
3653  /* parent process */
3654  close (result_pipe[WRITE_END]);
3655  close (errors_pipe[WRITE_END]);
3656  result_pipe[WRITE_END] = -1;
3657  errors_pipe[WRITE_END] = -1;
3658 
3659  ret = 0;
3660  do
3661  {
3662  ret = _dbus_read (result_pipe[READ_END], result, 1024);
3663  }
3664  while (ret > 0);
3665 
3666  /* reap the child process to avoid it lingering as zombie */
3667  do
3668  {
3669  ret = waitpid (pid, &status, 0);
3670  }
3671  while (ret == -1 && errno == EINTR);
3672 
3673  /* We succeeded if the process exited with status 0 and
3674  anything was read */
3675  if (!WIFEXITED (status) || WEXITSTATUS (status) != 0 )
3676  {
3677  /* The process ended with error */
3678  DBusString error_message;
3679  if (!_dbus_string_init (&error_message))
3680  {
3681  _DBUS_SET_OOM (error);
3682  goto out;
3683  }
3684 
3685  ret = 0;
3686  do
3687  {
3688  ret = _dbus_read (errors_pipe[READ_END], &error_message, 1024);
3689  }
3690  while (ret > 0);
3691 
3692  _dbus_string_set_length (result, orig_len);
3693  if (_dbus_string_get_length (&error_message) > 0)
3695  "%s terminated abnormally with the following error: %s",
3696  progpath, _dbus_string_get_data (&error_message));
3697  else
3699  "%s terminated abnormally without any error message",
3700  progpath);
3701  goto out;
3702  }
3703 
3704  retval = TRUE;
3705 
3706  out:
3707  sigprocmask (SIG_SETMASK, &old_set, NULL);
3708 
3709  if (retval)
3710  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3711  else
3712  _DBUS_ASSERT_ERROR_IS_SET (error);
3713 
3714  if (result_pipe[0] != -1)
3715  close (result_pipe[0]);
3716  if (result_pipe[1] != -1)
3717  close (result_pipe[1]);
3718  if (errors_pipe[0] != -1)
3719  close (errors_pipe[0]);
3720  if (errors_pipe[1] != -1)
3721  close (errors_pipe[1]);
3722 
3723  return retval;
3724 }
3725 #endif
3726 
3740 _dbus_get_autolaunch_address (const char *scope,
3741  DBusString *address,
3742  DBusError *error)
3743 {
3744 #ifdef DBUS_ENABLE_X11_AUTOLAUNCH
3745  /* Perform X11-based autolaunch. (We also support launchd-based autolaunch,
3746  * but that's done elsewhere, and if it worked, this function wouldn't
3747  * be called.) */
3748  const char *display;
3749  const char *progpath;
3750  char *argv[6];
3751  int i;
3752  DBusString uuid;
3753  dbus_bool_t retval;
3754 
3755  if (_dbus_check_setuid ())
3756  {
3758  "Unable to autolaunch when setuid");
3759  return FALSE;
3760  }
3761 
3762  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3763  retval = FALSE;
3764 
3765  /* fd.o #19997: if $DISPLAY isn't set to something useful, then
3766  * dbus-launch-x11 is just going to fail. Rather than trying to
3767  * run it, we might as well bail out early with a nice error.
3768  *
3769  * This is not strictly true in a world where the user bus exists,
3770  * because dbus-launch --autolaunch knows how to connect to that -
3771  * but if we were going to connect to the user bus, we'd have done
3772  * so before trying autolaunch: in any case. */
3773  display = _dbus_getenv ("DISPLAY");
3774 
3775  if (display == NULL || display[0] == '\0')
3776  {
3778  "Unable to autolaunch a dbus-daemon without a $DISPLAY for X11");
3779  return FALSE;
3780  }
3781 
3782  if (!_dbus_string_init (&uuid))
3783  {
3784  _DBUS_SET_OOM (error);
3785  return FALSE;
3786  }
3787 
3788  if (!_dbus_get_local_machine_uuid_encoded (&uuid, error))
3789  {
3790  goto out;
3791  }
3792 
3793 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
3794  progpath = _dbus_getenv ("DBUS_TEST_DBUS_LAUNCH");
3795 
3796  if (progpath == NULL)
3797 #endif
3798  progpath = DBUS_BINDIR "/dbus-launch";
3799  /*
3800  * argv[0] is always dbus-launch, that's the name what we'll
3801  * get from /proc, or ps(1), regardless what the progpath is,
3802  * see fd.o#69716
3803  */
3804  i = 0;
3805  argv[i] = "dbus-launch";
3806  ++i;
3807  argv[i] = "--autolaunch";
3808  ++i;
3809  argv[i] = _dbus_string_get_data (&uuid);
3810  ++i;
3811  argv[i] = "--binary-syntax";
3812  ++i;
3813  argv[i] = "--close-stderr";
3814  ++i;
3815  argv[i] = NULL;
3816  ++i;
3817 
3818  _dbus_assert (i == _DBUS_N_ELEMENTS (argv));
3819 
3820  retval = _read_subprocess_line_argv (progpath,
3821  TRUE,
3822  argv, address, error);
3823 
3824  out:
3825  _dbus_string_free (&uuid);
3826  return retval;
3827 #else
3829  "Using X11 for dbus-daemon autolaunch was disabled at compile time, "
3830  "set your DBUS_SESSION_BUS_ADDRESS instead");
3831  return FALSE;
3832 #endif
3833 }
3834 
3855  dbus_bool_t create_if_not_found,
3856  DBusError *error)
3857 {
3858  DBusString filename;
3859  dbus_bool_t b;
3860 
3861  _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
3862 
3863  b = _dbus_read_uuid_file (&filename, machine_id, FALSE, error);
3864  if (b)
3865  return TRUE;
3866 
3867  dbus_error_free (error);
3868 
3869  /* Fallback to the system machine ID */
3870  _dbus_string_init_const (&filename, "/etc/machine-id");
3871  b = _dbus_read_uuid_file (&filename, machine_id, FALSE, error);
3872 
3873  if (b)
3874  {
3875  /* try to copy it to the DBUS_MACHINE_UUID_FILE, but do not
3876  * complain if that isn't possible for whatever reason */
3877  _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
3878  _dbus_write_uuid_file (&filename, machine_id, NULL);
3879 
3880  return TRUE;
3881  }
3882 
3883  if (!create_if_not_found)
3884  return FALSE;
3885 
3886  /* if none found, try to make a new one */
3887  dbus_error_free (error);
3888  _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
3889 
3890  if (!_dbus_generate_uuid (machine_id, error))
3891  return FALSE;
3892 
3893  return _dbus_write_uuid_file (&filename, machine_id, error);
3894 }
3895 
3905  const char *launchd_env_var,
3906  DBusError *error)
3907 {
3908 #ifdef DBUS_ENABLE_LAUNCHD
3909  char *argv[4];
3910  int i;
3911 
3912  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3913 
3914  if (_dbus_check_setuid ())
3915  {
3917  "Unable to find launchd socket when setuid");
3918  return FALSE;
3919  }
3920 
3921  i = 0;
3922  argv[i] = "launchctl";
3923  ++i;
3924  argv[i] = "getenv";
3925  ++i;
3926  argv[i] = (char*)launchd_env_var;
3927  ++i;
3928  argv[i] = NULL;
3929  ++i;
3930 
3931  _dbus_assert (i == _DBUS_N_ELEMENTS (argv));
3932 
3933  if (!_read_subprocess_line_argv(argv[0], TRUE, argv, socket_path, error))
3934  {
3935  return FALSE;
3936  }
3937 
3938  /* no error, but no result either */
3939  if (_dbus_string_get_length(socket_path) == 0)
3940  {
3941  return FALSE;
3942  }
3943 
3944  /* strip the carriage-return */
3945  _dbus_string_shorten(socket_path, 1);
3946  return TRUE;
3947 #else /* DBUS_ENABLE_LAUNCHD */
3949  "can't lookup socket from launchd; launchd support not compiled in");
3950  return FALSE;
3951 #endif
3952 }
3953 
3954 #ifdef DBUS_ENABLE_LAUNCHD
3955 static dbus_bool_t
3956 _dbus_lookup_session_address_launchd (DBusString *address, DBusError *error)
3957 {
3958  dbus_bool_t valid_socket;
3959  DBusString socket_path;
3960 
3961  if (_dbus_check_setuid ())
3962  {
3964  "Unable to find launchd socket when setuid");
3965  return FALSE;
3966  }
3967 
3968  if (!_dbus_string_init (&socket_path))
3969  {
3970  _DBUS_SET_OOM (error);
3971  return FALSE;
3972  }
3973 
3974  valid_socket = _dbus_lookup_launchd_socket (&socket_path, "DBUS_LAUNCHD_SESSION_BUS_SOCKET", error);
3975 
3976  if (dbus_error_is_set(error))
3977  {
3978  _dbus_string_free(&socket_path);
3979  return FALSE;
3980  }
3981 
3982  if (!valid_socket)
3983  {
3984  dbus_set_error(error, "no socket path",
3985  "launchd did not provide a socket path, "
3986  "verify that org.freedesktop.dbus-session.plist is loaded!");
3987  _dbus_string_free(&socket_path);
3988  return FALSE;
3989  }
3990  if (!_dbus_string_append (address, "unix:path="))
3991  {
3992  _DBUS_SET_OOM (error);
3993  _dbus_string_free(&socket_path);
3994  return FALSE;
3995  }
3996  if (!_dbus_string_copy (&socket_path, 0, address,
3997  _dbus_string_get_length (address)))
3998  {
3999  _DBUS_SET_OOM (error);
4000  _dbus_string_free(&socket_path);
4001  return FALSE;
4002  }
4003 
4004  _dbus_string_free(&socket_path);
4005  return TRUE;
4006 }
4007 #endif
4008 
4010 _dbus_lookup_user_bus (dbus_bool_t *supported,
4011  DBusString *address,
4012  DBusError *error)
4013 {
4014  const char *runtime_dir = _dbus_getenv ("XDG_RUNTIME_DIR");
4015  dbus_bool_t ret = FALSE;
4016  struct stat stbuf;
4017  DBusString user_bus_path;
4018 
4019  if (runtime_dir == NULL)
4020  {
4021  _dbus_verbose ("XDG_RUNTIME_DIR not found in environment");
4022  *supported = FALSE;
4023  return TRUE; /* Cannot use it, but not an error */
4024  }
4025 
4026  if (!_dbus_string_init (&user_bus_path))
4027  {
4028  _DBUS_SET_OOM (error);
4029  return FALSE;
4030  }
4031 
4032  if (!_dbus_string_append_printf (&user_bus_path, "%s/bus", runtime_dir))
4033  {
4034  _DBUS_SET_OOM (error);
4035  goto out;
4036  }
4037 
4038  if (lstat (_dbus_string_get_const_data (&user_bus_path), &stbuf) == -1)
4039  {
4040  _dbus_verbose ("XDG_RUNTIME_DIR/bus not available: %s",
4041  _dbus_strerror (errno));
4042  *supported = FALSE;
4043  ret = TRUE; /* Cannot use it, but not an error */
4044  goto out;
4045  }
4046 
4047  if (stbuf.st_uid != getuid ())
4048  {
4049  _dbus_verbose ("XDG_RUNTIME_DIR/bus owned by uid %ld, not our uid %ld",
4050  (long) stbuf.st_uid, (long) getuid ());
4051  *supported = FALSE;
4052  ret = TRUE; /* Cannot use it, but not an error */
4053  goto out;
4054  }
4055 
4056  if ((stbuf.st_mode & S_IFMT) != S_IFSOCK)
4057  {
4058  _dbus_verbose ("XDG_RUNTIME_DIR/bus is not a socket: st_mode = 0o%lo",
4059  (long) stbuf.st_mode);
4060  *supported = FALSE;
4061  ret = TRUE; /* Cannot use it, but not an error */
4062  goto out;
4063  }
4064 
4065  if (!_dbus_string_append (address, "unix:path=") ||
4066  !_dbus_address_append_escaped (address, &user_bus_path))
4067  {
4068  _DBUS_SET_OOM (error);
4069  goto out;
4070  }
4071 
4072  *supported = TRUE;
4073  ret = TRUE;
4074 
4075 out:
4076  _dbus_string_free (&user_bus_path);
4077  return ret;
4078 }
4079 
4101  DBusString *address,
4102  DBusError *error)
4103 {
4104 #ifdef DBUS_ENABLE_LAUNCHD
4105  *supported = TRUE;
4106  return _dbus_lookup_session_address_launchd (address, error);
4107 #else
4108  *supported = FALSE;
4109 
4110  if (!_dbus_lookup_user_bus (supported, address, error))
4111  return FALSE;
4112  else if (*supported)
4113  return TRUE;
4114 
4115  /* On non-Mac Unix platforms, if the session address isn't already
4116  * set in DBUS_SESSION_BUS_ADDRESS environment variable and the
4117  * $XDG_RUNTIME_DIR/bus can't be used, we punt and fall back to the
4118  * autolaunch: global default; see init_session_address in
4119  * dbus/dbus-bus.c. */
4120  return TRUE;
4121 #endif
4122 }
4123 
4131 void
4133 {
4135 }
4136 
4152  DBusCredentials *credentials)
4153 {
4154  DBusString homedir;
4155  DBusString dotdir;
4156  dbus_uid_t uid;
4157 
4158  _dbus_assert (credentials != NULL);
4160 
4161  if (!_dbus_string_init (&homedir))
4162  return FALSE;
4163 
4164  uid = _dbus_credentials_get_unix_uid (credentials);
4165  _dbus_assert (uid != DBUS_UID_UNSET);
4166 
4167  if (!_dbus_homedir_from_uid (uid, &homedir))
4168  goto failed;
4169 
4170 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
4171  {
4172  const char *override;
4173 
4174  override = _dbus_getenv ("DBUS_TEST_HOMEDIR");
4175  if (override != NULL && *override != '\0')
4176  {
4177  _dbus_string_set_length (&homedir, 0);
4178  if (!_dbus_string_append (&homedir, override))
4179  goto failed;
4180 
4181  _dbus_verbose ("Using fake homedir for testing: %s\n",
4182  _dbus_string_get_const_data (&homedir));
4183  }
4184  else
4185  {
4186  /* Not strictly thread-safe, but if we fail at thread-safety here,
4187  * the worst that will happen is some extra warnings. */
4188  static dbus_bool_t already_warned = FALSE;
4189  if (!already_warned)
4190  {
4191  _dbus_warn ("Using your real home directory for testing, set DBUS_TEST_HOMEDIR to avoid\n");
4192  already_warned = TRUE;
4193  }
4194  }
4195  }
4196 #endif
4197 
4198  _dbus_string_init_const (&dotdir, ".dbus-keyrings");
4199  if (!_dbus_concat_dir_and_file (&homedir,
4200  &dotdir))
4201  goto failed;
4202 
4203  if (!_dbus_string_copy (&homedir, 0,
4204  directory, _dbus_string_get_length (directory))) {
4205  goto failed;
4206  }
4207 
4208  _dbus_string_free (&homedir);
4209  return TRUE;
4210 
4211  failed:
4212  _dbus_string_free (&homedir);
4213  return FALSE;
4214 }
4215 
4216 //PENDING(kdab) docs
4218 _dbus_daemon_publish_session_bus_address (const char* addr,
4219  const char *scope)
4220 {
4221  return TRUE;
4222 }
4223 
4224 //PENDING(kdab) docs
4225 void
4226 _dbus_daemon_unpublish_session_bus_address (void)
4227 {
4228 
4229 }
4230 
4239 {
4240  return e == EAGAIN || e == EWOULDBLOCK;
4241 }
4242 
4252  DBusError *error)
4253 {
4254  const char *filename_c;
4255 
4256  _DBUS_ASSERT_ERROR_IS_CLEAR (error);
4257 
4258  filename_c = _dbus_string_get_const_data (filename);
4259 
4260  if (rmdir (filename_c) != 0)
4261  {
4263  "Failed to remove directory %s: %s\n",
4264  filename_c, _dbus_strerror (errno));
4265  return FALSE;
4266  }
4267 
4268  return TRUE;
4269 }
4270 
4280 {
4281 #ifdef SCM_RIGHTS
4282  union {
4283  struct sockaddr sa;
4284  struct sockaddr_storage storage;
4285  struct sockaddr_un un;
4286  } sa_buf;
4287 
4288  socklen_t sa_len = sizeof(sa_buf);
4289 
4290  _DBUS_ZERO(sa_buf);
4291 
4292  if (getsockname(fd.fd, &sa_buf.sa, &sa_len) < 0)
4293  return FALSE;
4294 
4295  return sa_buf.sa.sa_family == AF_UNIX;
4296 
4297 #else
4298  return FALSE;
4299 
4300 #endif
4301 }
4302 
4307 void
4309 {
4310  int maxfds, i;
4311 
4312 #ifdef __linux__
4313  DIR *d;
4314 
4315  /* On Linux we can optimize this a bit if /proc is available. If it
4316  isn't available, fall back to the brute force way. */
4317 
4318  d = opendir ("/proc/self/fd");
4319  if (d)
4320  {
4321  for (;;)
4322  {
4323  struct dirent buf, *de;
4324  int k, fd;
4325  long l;
4326  char *e = NULL;
4327 
4328  k = readdir_r (d, &buf, &de);
4329  if (k != 0 || !de)
4330  break;
4331 
4332  if (de->d_name[0] == '.')
4333  continue;
4334 
4335  errno = 0;
4336  l = strtol (de->d_name, &e, 10);
4337  if (errno != 0 || e == NULL || *e != '\0')
4338  continue;
4339 
4340  fd = (int) l;
4341  if (fd < 3)
4342  continue;
4343 
4344  if (fd == dirfd (d))
4345  continue;
4346 
4347  close (fd);
4348  }
4349 
4350  closedir (d);
4351  return;
4352  }
4353 #endif
4354 
4355  maxfds = sysconf (_SC_OPEN_MAX);
4356 
4357  /* Pick something reasonable if for some reason sysconf says
4358  * unlimited.
4359  */
4360  if (maxfds < 0)
4361  maxfds = 1024;
4362 
4363  /* close all inherited fds */
4364  for (i = 3; i < maxfds; i++)
4365  close (i);
4366 }
4367 
4379 {
4380  /* TODO: get __libc_enable_secure exported from glibc.
4381  * See http://www.openwall.com/lists/owl-dev/2012/08/14/1
4382  */
4383 #if 0 && defined(HAVE_LIBC_ENABLE_SECURE)
4384  {
4385  /* See glibc/include/unistd.h */
4386  extern int __libc_enable_secure;
4387  return __libc_enable_secure;
4388  }
4389 #elif defined(HAVE_ISSETUGID)
4390  /* BSD: http://www.freebsd.org/cgi/man.cgi?query=issetugid&sektion=2 */
4391  return issetugid ();
4392 #else
4393  uid_t ruid, euid, suid; /* Real, effective and saved user ID's */
4394  gid_t rgid, egid, sgid; /* Real, effective and saved group ID's */
4395 
4396  /* We call into this function from _dbus_threads_init_platform_specific()
4397  * to make sure these are initialized before we start threading. */
4398  static dbus_bool_t check_setuid_initialised;
4399  static dbus_bool_t is_setuid;
4400 
4401  if (_DBUS_UNLIKELY (!check_setuid_initialised))
4402  {
4403 #ifdef HAVE_GETRESUID
4404  if (getresuid (&ruid, &euid, &suid) != 0 ||
4405  getresgid (&rgid, &egid, &sgid) != 0)
4406 #endif /* HAVE_GETRESUID */
4407  {
4408  suid = ruid = getuid ();
4409  sgid = rgid = getgid ();
4410  euid = geteuid ();
4411  egid = getegid ();
4412  }
4413 
4414  check_setuid_initialised = TRUE;
4415  is_setuid = (ruid != euid || ruid != suid ||
4416  rgid != egid || rgid != sgid);
4417 
4418  }
4419  return is_setuid;
4420 #endif
4421 }
4422 
4432  DBusString *address,
4433  DBusError *error)
4434 {
4435  union {
4436  struct sockaddr sa;
4437  struct sockaddr_storage storage;
4438  struct sockaddr_un un;
4439  struct sockaddr_in ipv4;
4440  struct sockaddr_in6 ipv6;
4441  } socket;
4442  char hostip[INET6_ADDRSTRLEN];
4443  int size = sizeof (socket);
4444  DBusString path_str;
4445 
4446  if (getsockname (fd.fd, &socket.sa, &size))
4447  goto err;
4448 
4449  switch (socket.sa.sa_family)
4450  {
4451  case AF_UNIX:
4452  if (socket.un.sun_path[0]=='\0')
4453  {
4454  _dbus_string_init_const (&path_str, &(socket.un.sun_path[1]));
4455  if (_dbus_string_append (address, "unix:abstract=") &&
4456  _dbus_address_append_escaped (address, &path_str))
4457  return TRUE;
4458  }
4459  else
4460  {
4461  _dbus_string_init_const (&path_str, socket.un.sun_path);
4462  if (_dbus_string_append (address, "unix:path=") &&
4463  _dbus_address_append_escaped (address, &path_str))
4464  return TRUE;
4465  }
4466  break;
4467  case AF_INET:
4468  if (inet_ntop (AF_INET, &socket.ipv4.sin_addr, hostip, sizeof (hostip)))
4469  if (_dbus_string_append_printf (address, "tcp:family=ipv4,host=%s,port=%u",
4470  hostip, ntohs (socket.ipv4.sin_port)))
4471  return TRUE;
4472  break;
4473 #ifdef AF_INET6
4474  case AF_INET6:
4475  _dbus_string_init_const (&path_str, hostip);
4476  if (inet_ntop (AF_INET6, &socket.ipv6.sin6_addr, hostip, sizeof (hostip)))
4477  if (_dbus_string_append_printf (address, "tcp:family=ipv6,port=%u,host=",
4478  ntohs (socket.ipv6.sin6_port)) &&
4479  _dbus_address_append_escaped (address, &path_str))
4480  return TRUE;
4481  break;
4482 #endif
4483  default:
4484  dbus_set_error (error,
4485  _dbus_error_from_errno (EINVAL),
4486  "Failed to read address from socket: Unknown socket type.");
4487  return FALSE;
4488  }
4489  err:
4490  dbus_set_error (error,
4491  _dbus_error_from_errno (errno),
4492  "Failed to open socket: %s",
4493  _dbus_strerror (errno));
4494  return FALSE;
4495 }
4496 
4497 int
4498 _dbus_save_socket_errno (void)
4499 {
4500  return errno;
4501 }
4502 
4503 void
4504 _dbus_restore_socket_errno (int saved_errno)
4505 {
4506  errno = saved_errno;
4507 }
4508 
4509 /* tests in dbus-sysdeps-util.c */
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_PRIVATE_EXPORT dbus_bool_t _dbus_string_parse_int(const DBusString *str, int start, long *value_return, int *end_return)
Parses an integer contained in a DBusString.
Definition: dbus-sysdeps.c:435
An atomic integer safe to increment or decrement from multiple threads.
Definition: dbus-sysdeps.h:279
dbus_uid_t _dbus_credentials_get_unix_uid(DBusCredentials *credentials)
Gets the UNIX user ID in the credentials, or DBUS_UID_UNSET if the credentials object doesn&#39;t contain...
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_append_uint(DBusString *str, unsigned long value)
Appends an unsigned integer to a DBusString.
Definition: dbus-sysdeps.c:392
char * username
Username.
#define NULL
A null pointer, defined appropriately for C or C++.
#define DBUS_ERROR_SPAWN_EXEC_FAILED
While starting a new process, the exec() call failed.
volatile dbus_int32_t value
Value of the atomic integer.
Definition: dbus-sysdeps.h:284
dbus_bool_t _dbus_check_dir_is_private_to_user(DBusString *dir, DBusError *error)
Checks to make sure the given directory is private to the user.
void _dbus_close_all(void)
Closes all file descriptors except the first three (i.e.
void * dbus_realloc(void *memory, size_t bytes)
Resizes a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:601
dbus_bool_t _dbus_string_lengthen(DBusString *str, int additional_length)
Makes a string longer by the given number of bytes.
Definition: dbus-string.c:760
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_socketpair(DBusSocket *fd1, DBusSocket *fd2, dbus_bool_t blocking, DBusError *error)
Creates pair of connect sockets (as in socketpair()).
int _dbus_write(int fd, const DBusString *buffer, int start, int len)
Thin wrapper around the write() system call that writes a part of a DBusString and handles EINTR for ...
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 ...
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn&#39;t supported (like ENOSYS on UNIX).
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition: dbus-memory.h:58
#define DBUS_GID_FORMAT
an appropriate printf format for dbus_gid_t
Definition: dbus-sysdeps.h:123
#define DBUS_PID_FORMAT
an appropriate printf format for dbus_pid_t
Definition: dbus-sysdeps.h:119
dbus_bool_t _dbus_generate_uuid(DBusGUID *uuid, DBusError *error)
Generates a new UUID.
dbus_bool_t _dbus_get_local_machine_uuid_encoded(DBusString *uuid_str, DBusError *error)
Gets the hex-encoded UUID of the machine this function is executed on.
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
dbus_bool_t _dbus_append_address_from_socket(DBusSocket fd, DBusString *address, DBusError *error)
Read the address from the socket and append it to the string.
dbus_bool_t _dbus_check_setuid(void)
NOTE: If you modify this function, please also consider making the corresponding change in GLib...
void _dbus_user_database_flush_system(void)
Flushes the system global user database;.
Definition: dbus-userdb.c:349
void dbus_error_free(DBusError *error)
Frees an error that&#39;s been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition: dbus-errors.c:211
dbus_gid_t primary_gid
GID.
dbus_bool_t _dbus_credentials_add_linux_security_label(DBusCredentials *credentials, const char *label)
Add a Linux security label, as used by LSMs such as SELinux, Smack and AppArmor, to the credentials...
A globally unique ID ; we have one for each DBusServer, and also one for each machine with libdbus in...
dbus_pid_t _dbus_getpid(void)
Gets our process ID.
#define _DBUS_POLLIN
There is data to read.
Definition: dbus-sysdeps.h:388
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
char * _dbus_string_get_data_len(DBusString *str, int start, int len)
Gets a sub-portion of the raw character buffer from the string.
Definition: dbus-string.c:490
int _dbus_read_socket(DBusSocket fd, DBusString *buffer, int count)
Like _dbus_read(), but only works on sockets so is available on Windows.
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition: dbus-string.c:175
#define DBUS_ERROR_IO_ERROR
Something went wrong reading or writing to a socket, for example.
int _dbus_dup(int fd, DBusError *error)
Duplicates a file descriptor.
void _dbus_string_shorten(DBusString *str, int length_to_remove)
Makes a string shorter by the given number of bytes.
Definition: dbus-string.c:780
short events
Events to poll for.
Definition: dbus-sysdeps.h:383
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:1283
#define DBUS_PID_UNSET
an invalid PID used to represent an uninitialized dbus_pid_t field
Definition: dbus-sysdeps.h:112
dbus_bool_t _dbus_send_credentials_socket(DBusSocket server_fd, DBusError *error)
Sends a single nul byte with our UNIX credentials as ancillary data.
dbus_bool_t _dbus_close_socket(DBusSocket fd, DBusError *error)
Closes a socket.
void _dbus_credentials_clear(DBusCredentials *credentials)
Clear all credentials in the object.
#define DBUS_UID_UNSET
an invalid UID used to represent an uninitialized dbus_uid_t field
Definition: dbus-sysdeps.h:114
dbus_bool_t _dbus_parse_uid(const DBusString *uid_str, dbus_uid_t *uid)
Gets a UID from a UID string.
dbus_bool_t _dbus_get_autolaunch_address(const char *scope, DBusString *address, DBusError *error)
Returns the address of a new session bus.
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:590
dbus_bool_t _dbus_user_info_fill(DBusUserInfo *info, const DBusString *username, DBusError *error)
Gets user info for the given username.
dbus_bool_t _dbus_homedir_from_uid(dbus_uid_t uid, DBusString *homedir)
Gets the home directory for the given user.
Definition: dbus-userdb.c:461
unsigned long dbus_pid_t
A process ID.
Definition: dbus-sysdeps.h:105
int _dbus_read_socket_with_unix_fds(DBusSocket fd, DBusString *buffer, int count, int *fds, int *n_fds)
Like _dbus_read_socket() but also tries to read unix fds from the socket.
Socket interface.
Definition: dbus-sysdeps.h:148
dbus_gid_t * group_ids
Groups IDs, including above primary group.
dbus_bool_t _dbus_lookup_launchd_socket(DBusString *socket_path, const char *launchd_env_var, DBusError *error)
quries launchd for a specific env var which holds the socket path.
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition: dbus-memory.c:461
dbus_bool_t _dbus_append_user_from_current_process(DBusString *str)
Append to the string the identity we would like to have when we authenticate, on UNIX this is the cur...
dbus_bool_t _dbus_credentials_are_anonymous(DBusCredentials *credentials)
Checks whether a credentials object contains a user identity.
dbus_bool_t _dbus_get_is_errno_eagain_or_ewouldblock(int e)
See if errno is EAGAIN or EWOULDBLOCK (this has to be done differently for Winsock so is abstracted) ...
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
int n_group_ids
Size of group IDs array.
int _dbus_listen_systemd_sockets(DBusSocket **fds, DBusError *error)
Acquires one or more sockets passed in from systemd.
#define _DBUS_POLLOUT
Writing now will not block.
Definition: dbus-sysdeps.h:392
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
int _dbus_write_socket_two(DBusSocket fd, const DBusString *buffer1, int start1, int len1, const DBusString *buffer2, int start2, int len2)
Like _dbus_write_two() but only works on sockets and is thus available on Windows.
DBusSocket _dbus_accept(DBusSocket listen_fd)
Accepts a connection on a listening socket.
dbus_bool_t _dbus_string_init_preallocated(DBusString *str, int allocate_size)
Initializes a string that can be up to the given allocation size before it has to realloc...
Definition: dbus-string.c:132
dbus_int32_t _dbus_atomic_inc(DBusAtomic *atomic)
Atomically increments an integer.
dbus_uid_t uid
UID.
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_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition: dbus-string.c:1114
dbus_bool_t _dbus_append_keyring_directory_for_credentials(DBusString *directory, DBusCredentials *credentials)
Appends the directory in which a keyring for the given credentials should be stored.
dbus_bool_t _dbus_read_credentials_socket(DBusSocket client_fd, DBusCredentials *credentials, DBusError *error)
Reads a single byte which must be nul (an error occurs otherwise), and reads unix credentials if avai...
dbus_bool_t _dbus_create_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed.
dbus_bool_t _dbus_delete_directory(const DBusString *filename, DBusError *error)
Removes a directory; Directory must be empty.
Object representing an exception.
Definition: dbus-errors.h:48
dbus_bool_t _dbus_address_append_escaped(DBusString *escaped, const DBusString *unescaped)
Appends an escaped version of one string to another string, using the D-Bus address escaping mechanis...
Definition: dbus-address.c:104
void _dbus_get_monotonic_time(long *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
int _dbus_listen_tcp_socket(const char *host, const char *port, const char *family, DBusString *retport, DBusSocket **fds_p, DBusError *error)
Creates a socket and binds it to the given path, then listens on the socket.
void _dbus_disable_sigpipe(void)
signal (SIGPIPE, SIG_IGN);
#define DBUS_ERROR_BAD_ADDRESS
A D-Bus bus address was malformed.
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_credentials_add_adt_audit_data(DBusCredentials *credentials, void *audit_data, dbus_int32_t size)
Add ADT audit data to the credentials.
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
void _dbus_flush_caches(void)
Called when the bus daemon is signaled to reload its configuration; any caches should be nuked...
int _dbus_connect_exec(const char *path, char *const argv[], DBusError *error)
Creates a UNIX domain socket and connects it to the specified process to execute. ...
const char * _dbus_get_tmpdir(void)
Gets the temporary files directory by inspecting the environment variables TMPDIR, TMP, and TEMP in that order.
dbus_bool_t _dbus_string_append_byte(DBusString *str, unsigned char byte)
Appends a single byte to the string, returning FALSE if not enough memory.
Definition: dbus-string.c:1157
#define _DBUS_UNLOCK(name)
Unlocks a global lock.
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init().
Definition: dbus-string.c:259
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition: dbus-sysdeps.h:116
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
dbus_bool_t _dbus_credentials_add_from_current_process(DBusCredentials *credentials)
Adds the credentials of the current process to the passed-in credentials object.
#define TRUE
Expands to "1".
DBusPollable fd
File descriptor.
Definition: dbus-sysdeps.h:382
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
dbus_bool_t _dbus_credentials_add_pid(DBusCredentials *credentials, dbus_pid_t pid)
Add a UNIX process ID to the credentials.
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
#define READ_END
Helps remember which end of the pipe is which.
Definition: dbus-spawn.c:873
#define DBUS_UID_FORMAT
an appropriate printf format for dbus_uid_t
Definition: dbus-sysdeps.h:121
dbus_bool_t _dbus_read_uuid_file(const DBusString *filename, DBusGUID *uuid, dbus_bool_t create_if_not_found, DBusError *error)
Reads (and optionally writes) a uuid to a file.
char * homedir
Home directory.
void _dbus_exit(int code)
Exit the process, returning the given value.
unsigned long _dbus_pid_for_log(void)
The only reason this is separate from _dbus_getpid() is to allow it on Windows for logging but not fo...
void _dbus_fd_set_close_on_exec(int fd)
Sets the file descriptor to be close on exec.
DBusSocket _dbus_connect_tcp_socket(const char *host, const char *port, const char *family, DBusError *error)
Creates a socket and connects to a socket at the given host and port.
dbus_int32_t _dbus_atomic_dec(DBusAtomic *atomic)
Atomically decrement an integer.
dbus_uid_t _dbus_getuid(void)
Gets our UID.
dbus_bool_t _dbus_generate_random_bytes(DBusString *str, int n_bytes, DBusError *error)
Generates the given number of securely random bytes, using the best mechanism we can come up with...
dbus_bool_t _dbus_user_info_fill_uid(DBusUserInfo *info, dbus_uid_t uid, DBusError *error)
Gets user info for the given user ID.
dbus_bool_t _dbus_set_socket_nonblocking(DBusSocket fd, DBusError *error)
Sets a file descriptor to be nonblocking.
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
dbus_bool_t _dbus_lookup_session_address(dbus_bool_t *supported, DBusString *address, DBusError *error)
Determines the address of the session bus by querying a platform-specific method. ...
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
#define FALSE
Expands to "0".
dbus_bool_t _dbus_read_local_machine_uuid(DBusGUID *machine_id, dbus_bool_t create_if_not_found, DBusError *error)
Reads the uuid of the machine we&#39;re running on from the dbus configuration.
dbus_bool_t _dbus_write_uuid_file(const DBusString *filename, const DBusGUID *uuid, DBusError *error)
Write the give UUID to a file.
void _dbus_print_backtrace(void)
On GNU libc systems, print a crude backtrace to stderr.
void dbus_set_error_const(DBusError *error, const char *name, const char *message)
Assigns an error name and message to a DBusError.
Definition: dbus-errors.c:243
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition: dbus-string.c:802
#define _DBUS_LOCK(name)
Locks a global lock, initializing it first if necessary.
int _dbus_write_socket(DBusSocket fd, const DBusString *buffer, int start, int len)
Like _dbus_write(), but only supports sockets and is thus available on Windows.
int _dbus_write_two(int fd, const DBusString *buffer1, int start1, int len1, const DBusString *buffer2, int start2, int len2)
Like _dbus_write() but will use writev() if possible to write both buffers in sequence.
dbus_int32_t _dbus_atomic_get(DBusAtomic *atomic)
Atomically get the value of an integer.
void _dbus_sleep_milliseconds(int milliseconds)
Sleeps the given number of milliseconds.
DBUS_PRIVATE_EXPORT void _dbus_verbose_bytes_of_string(const DBusString *str, int start, int len)
Dump the given part of the string to verbose log.
#define WRITE_END
Helps remember which end of the pipe is which.
Definition: dbus-spawn.c:875
unsigned long dbus_gid_t
A group ID.
Definition: dbus-sysdeps.h:109
int _dbus_printf_string_upper_bound(const char *format, va_list args)
Measure the length of the given format string and arguments, not including the terminating nul...
char * _dbus_strdup(const char *str)
Duplicates a string.
#define _DBUS_ZERO(object)
Sets all bits in an object to zero.
dbus_bool_t _dbus_credentials_add_unix_uid(DBusCredentials *credentials, dbus_uid_t uid)
Add a UNIX user ID to the credentials.
dbus_bool_t _dbus_socket_can_pass_unix_fd(DBusSocket fd)
Checks whether file descriptors may be passed via the socket.
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition: dbus-sysdeps.c:185
unsigned long dbus_uid_t
A user ID.
Definition: dbus-sysdeps.h:107
int _dbus_poll(DBusPollFD *fds, int n_fds, int timeout_milliseconds)
Wrapper for poll().
short revents
Events that occurred.
Definition: dbus-sysdeps.h:384
int _dbus_connect_unix_socket(const char *path, dbus_bool_t abstract, DBusError *error)
Creates a socket and connects it to the UNIX domain socket at the given path.
dbus_bool_t dbus_error_is_set(const DBusError *error)
Checks whether an error occurred (the error is set).
Definition: dbus-errors.c:329
int _dbus_listen_unix_socket(const char *path, dbus_bool_t abstract, DBusError *error)
Creates a socket and binds it to the given path, then listens on the socket.
void _dbus_get_real_time(long *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
Information about a UNIX user.
#define _DBUS_POLLERR
Error condition.
Definition: dbus-sysdeps.h:394