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

D-Bus 1.16.2

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 * SPDX-License-Identifier: AFL-2.1 OR GPL-2.0-or-later
8 *
9 * Licensed under the Academic Free License version 2.1
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 *
25 */
26
27#include <config.h>
28
29#include "dbus-internals.h"
30#include "dbus-sysdeps.h"
31#include "dbus-sysdeps-unix.h"
32#include "dbus-threads.h"
33#include "dbus-protocol.h"
34#include "dbus-file.h"
35#include "dbus-transport.h"
36#include "dbus-string.h"
37#include "dbus-userdb.h"
38#include "dbus-list.h"
39#include "dbus-credentials.h"
40#include "dbus-nonce.h"
41
42#include <limits.h>
43#include <sys/types.h>
44#include <stdlib.h>
45#include <string.h>
46#include <signal.h>
47#include <unistd.h>
48#include <stdio.h>
49#include <fcntl.h>
50#include <sys/socket.h>
51#include <dirent.h>
52#include <sys/un.h>
53#include <pwd.h>
54#include <time.h>
55#include <locale.h>
56#include <sys/time.h>
57#include <sys/stat.h>
58#include <sys/wait.h>
59#include <netinet/in.h>
60#include <netinet/tcp.h>
61#include <netdb.h>
62#include <grp.h>
63#include <arpa/inet.h>
64
65#ifdef HAVE_ERRNO_H
66#include <errno.h>
67#endif
68#ifdef HAVE_LINUX_CLOSE_RANGE_H
69#include <linux/close_range.h>
70#endif
71#ifdef HAVE_SYSLOG_H
72#include <syslog.h>
73#endif
74#ifdef HAVE_WRITEV
75#include <sys/uio.h>
76#endif
77#ifdef HAVE_BACKTRACE
78#include <execinfo.h>
79#endif
80#ifdef HAVE_GETPEERUCRED
81#include <ucred.h>
82#endif
83#ifdef HAVE_ALLOCA_H
84#include <alloca.h>
85#endif
86#ifdef HAVE_SYS_RANDOM_H
87#include <sys/random.h>
88#endif
89#ifdef HAVE_SYS_SYSCALL_H
90#include <sys/syscall.h>
91#endif
92
93#ifdef HAVE_ADT
94#include <bsm/adt.h>
95#endif
96
97#ifdef HAVE_SYSTEMD
98#include <systemd/sd-daemon.h>
99#endif
100
101#if !defined(HAVE_STDATOMIC_H) && !DBUS_USE_SYNC
102#include <pthread.h>
103#endif
104
105#ifndef O_BINARY
106#define O_BINARY 0
107#endif
108
109#ifndef AI_ADDRCONFIG
110#define AI_ADDRCONFIG 0
111#endif
112
113#ifndef HAVE_SOCKLEN_T
114#define socklen_t int
115#endif
116
117#if defined (__sun) || defined (__sun__)
118/*
119 * CMS_SPACE etc. definitions for Solaris < 10, based on
120 * http://mailman.videolan.org/pipermail/vlc-devel/2006-May/024402.html
121 * via
122 * http://wiki.opencsw.org/porting-faq#toc10
123 *
124 * These are only redefined for Solaris, for now: if your OS needs these too,
125 * please file a bug. (Or preferably, improve your OS so they're not needed.)
126 */
127
128# ifndef CMSG_ALIGN
129# ifdef __sun__
130# define CMSG_ALIGN(len) _CMSG_DATA_ALIGN (len)
131# else
132 /* aligning to sizeof (long) is assumed to be portable (fd.o#40235) */
133# define CMSG_ALIGN(len) (((len) + sizeof (long) - 1) & \
134 ~(sizeof (long) - 1))
135# endif
136# endif
137
138# ifndef CMSG_SPACE
139# define CMSG_SPACE(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + \
140 CMSG_ALIGN (len))
141# endif
142
143# ifndef CMSG_LEN
144# define CMSG_LEN(len) (CMSG_ALIGN (sizeof (struct cmsghdr)) + (len))
145# endif
146
147#endif /* Solaris */
148
149#if defined(__linux__) && defined(__NR_close_range) && !defined(HAVE_CLOSE_RANGE)
150/* The kernel headers are new enough to have the close_range syscall,
151 * but glibc isn't new enough to have the syscall wrapper, so call the
152 * syscall directly. */
153static inline int
154close_range (unsigned int first,
155 unsigned int last,
156 int flags)
157{
158 return syscall (__NR_close_range, first, last, flags);
159}
160/* Now we can call that inline wrapper as though it was provided by glibc. */
161#define HAVE_CLOSE_RANGE
162#endif
163
178 dbus_bool_t
179_dbus_ensure_standard_fds (DBusEnsureStandardFdsFlags flags,
180 const char **error_str_p)
181{
182 static int const relevant_flag[] = { DBUS_FORCE_STDIN_NULL,
183 DBUS_FORCE_STDOUT_NULL,
184 DBUS_FORCE_STDERR_NULL };
185 /* Should always get replaced with the real error before use */
186 const char *error_str = "Failed mysteriously";
187 int devnull = -1;
188 int saved_errno;
189 /* This function relies on the standard fds having their POSIX values. */
190 _DBUS_STATIC_ASSERT (STDIN_FILENO == 0);
191 _DBUS_STATIC_ASSERT (STDOUT_FILENO == 1);
192 _DBUS_STATIC_ASSERT (STDERR_FILENO == 2);
193 int i;
194
195 for (i = STDIN_FILENO; i <= STDERR_FILENO; i++)
196 {
197 /* Because we rely on being single-threaded, and we want the
198 * standard fds to not be close-on-exec, we don't set it
199 * close-on-exec. */
200 if (devnull < i)
201 devnull = open ("/dev/null", O_RDWR);
202
203 if (devnull < 0)
204 {
205 error_str = "Failed to open /dev/null";
206 goto out;
207 }
208
209 /* We already opened all fds < i, so the only way this assertion
210 * could fail is if another thread closed one, and we document
211 * this function as not safe for multi-threading. */
212 _dbus_assert (devnull >= i);
213
214 if (devnull != i && (flags & relevant_flag[i]) != 0)
215 {
216 if (dup2 (devnull, i) < 0)
217 {
218 error_str = "Failed to dup2 /dev/null onto a standard fd";
219 goto out;
220 }
221 }
222 }
223
224 error_str = NULL;
225
226out:
227 saved_errno = errno;
228
229 if (devnull > STDERR_FILENO)
230 close (devnull);
231
232 if (error_str_p != NULL)
233 *error_str_p = error_str;
234
235 errno = saved_errno;
236 return (error_str == NULL);
237}
238
239static dbus_bool_t _dbus_set_fd_nonblocking (int fd,
240 DBusError *error);
241
242static dbus_bool_t
243_dbus_open_socket (int *fd_p,
244 int domain,
245 int type,
246 int protocol,
247 DBusError *error)
248{
249#ifdef SOCK_CLOEXEC
250 dbus_bool_t cloexec_done;
251
252 *fd_p = socket (domain, type | SOCK_CLOEXEC, protocol);
253 cloexec_done = *fd_p >= 0;
254
255 /* Check if kernel seems to be too old to know SOCK_CLOEXEC */
256 if (*fd_p < 0 && (errno == EINVAL || errno == EPROTOTYPE))
257#endif
258 {
259 *fd_p = socket (domain, type, protocol);
260 }
261
262 if (*fd_p >= 0)
263 {
264#ifdef SOCK_CLOEXEC
265 if (!cloexec_done)
266#endif
267 {
268 _dbus_fd_set_close_on_exec(*fd_p);
269 }
270
271 _dbus_verbose ("socket fd %d opened\n", *fd_p);
272 return TRUE;
273 }
274 else
275 {
276 dbus_set_error(error,
277 _dbus_error_from_errno (errno),
278 "Failed to open socket: %s",
279 _dbus_strerror (errno));
280 return FALSE;
281 }
282}
283
294static dbus_bool_t
295_dbus_open_unix_socket (int *fd,
296 DBusError *error)
297{
298 return _dbus_open_socket(fd, AF_UNIX, SOCK_STREAM, 0, error);
299}
300
313 dbus_bool_t
314_dbus_close_socket (DBusSocket *fd,
315 DBusError *error)
316{
317 dbus_bool_t rv;
318
319 _dbus_assert (fd != NULL);
320 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
321
322 rv = _dbus_close (fd->fd, error);
323 _dbus_socket_invalidate (fd);
324
325 return rv;
326}
327
337int
338_dbus_read_socket (DBusSocket fd,
339 DBusString *buffer,
340 int count)
341{
342 return _dbus_read (fd.fd, buffer, count);
343}
344
355int
356_dbus_write_socket (DBusSocket fd,
357 const DBusString *buffer,
358 int start,
359 int len)
360{
361#if HAVE_DECL_MSG_NOSIGNAL
362 const char *data;
363 int bytes_written;
364
365 data = _dbus_string_get_const_data_len (buffer, start, len);
366
367 again:
368
369 bytes_written = send (fd.fd, data, len, MSG_NOSIGNAL);
370
371 if (bytes_written < 0 && errno == EINTR)
372 goto again;
373
374 return bytes_written;
375
376#else
377 return _dbus_write (fd.fd, buffer, start, len);
378#endif
379}
380
393int
394_dbus_read_socket_with_unix_fds (DBusSocket fd,
395 DBusString *buffer,
396 int count,
397 int *fds,
398 unsigned int *n_fds) {
399#ifndef HAVE_UNIX_FD_PASSING
400 int r;
401
402 if ((r = _dbus_read_socket(fd, buffer, count)) < 0)
403 return r;
404
405 *n_fds = 0;
406 return r;
407
408#else
409 int bytes_read;
410 int start;
411 struct msghdr m;
412 struct iovec iov;
413
414 _dbus_assert (count >= 0);
415 _dbus_assert (*n_fds <= DBUS_MAXIMUM_MESSAGE_UNIX_FDS);
416
417 start = _dbus_string_get_length (buffer);
418
419 if (!_dbus_string_lengthen (buffer, count))
420 {
421 errno = ENOMEM;
422 return -1;
423 }
424
425 _DBUS_ZERO(iov);
426 iov.iov_base = _dbus_string_get_data_len (buffer, start, count);
427 iov.iov_len = count;
428
429 _DBUS_ZERO(m);
430 m.msg_iov = &iov;
431 m.msg_iovlen = 1;
432
433 /* Hmm, we have no clue how long the control data will actually be
434 that is queued for us. The least we can do is assume that the
435 caller knows. Hence let's make space for the number of fds that
436 we shall read at max plus the cmsg header. */
437 m.msg_controllen = CMSG_SPACE(*n_fds * sizeof(int));
438
439 /* It's probably safe to assume that systems with SCM_RIGHTS also
440 know alloca() */
441 m.msg_control = alloca(m.msg_controllen);
442 memset(m.msg_control, 0, m.msg_controllen);
443
444 /* Do not include the padding at the end when we tell the kernel
445 * how much we're willing to receive. This avoids getting
446 * the padding filled with additional fds that we weren't expecting,
447 * if a (potentially malicious) sender included them. (fd.o #83622) */
448 m.msg_controllen = CMSG_LEN (*n_fds * sizeof(int));
449
450 again:
451
452 bytes_read = recvmsg (fd.fd, &m, 0
453#ifdef MSG_CMSG_CLOEXEC
454 |MSG_CMSG_CLOEXEC
455#endif
456 );
457
458 if (bytes_read < 0)
459 {
460 if (errno == EINTR)
461 goto again;
462 else
463 {
464 /* put length back (note that this doesn't actually realloc anything) */
465 _dbus_string_set_length (buffer, start);
466 return -1;
467 }
468 }
469 else
470 {
471 struct cmsghdr *cm;
472 dbus_bool_t found = FALSE;
473
474 for (cm = CMSG_FIRSTHDR(&m); cm; cm = CMSG_NXTHDR(&m, cm))
475 if (cm->cmsg_level == SOL_SOCKET && cm->cmsg_type == SCM_RIGHTS)
476 {
477 size_t i;
478 int *payload = (int *) (void *) CMSG_DATA (cm);
479 size_t payload_len_bytes = (cm->cmsg_len - CMSG_LEN (0));
480 size_t payload_len_fds;
481 size_t fds_to_use;
482
483 /* Every unsigned int fits in a size_t without truncation, so
484 * casting (size_t) *n_fds is OK */
485 _DBUS_STATIC_ASSERT (sizeof (size_t) >= sizeof (unsigned int));
486
487 if ((m.msg_flags & MSG_CTRUNC) && CMSG_NXTHDR(&m, cm) == NULL &&
488 (char *) payload + payload_len_bytes >
489 (char *) m.msg_control + m.msg_controllen)
490 {
491 /* This is the last cmsg in a truncated message and using
492 * cmsg_len would apparently overrun the allocated buffer.
493 * Some operating systems (illumos and Solaris are known) do
494 * not adjust cmsg_len in the last cmsg when truncation occurs.
495 * Adjust the payload length here. The calculation for
496 * payload_len_fds below will discard any trailing bytes that
497 * belong to an incomplete file descriptor - the kernel will
498 * have already closed that (at least for illumos and Solaris)
499 */
500 payload_len_bytes = m.msg_controllen -
501 ((char *) payload - (char *) m.msg_control);
502 }
503
504 payload_len_fds = payload_len_bytes / sizeof (int);
505
506 if (_DBUS_LIKELY (payload_len_fds <= (size_t) *n_fds))
507 {
508 /* The fds in the payload will fit in our buffer */
509 fds_to_use = payload_len_fds;
510 }
511 else
512 {
513 /* Too many fds in the payload. This shouldn't happen
514 * any more because we're setting m.msg_controllen to
515 * the exact number we can accept, but be safe and
516 * truncate. */
517 fds_to_use = (size_t) *n_fds;
518
519 /* Close the excess fds to avoid DoS: if they stayed open,
520 * someone could send us an extra fd per message
521 * and we'd eventually run out. */
522 for (i = fds_to_use; i < payload_len_fds; i++)
523 {
524 close (payload[i]);
525 }
526 }
527
528 memcpy (fds, payload, fds_to_use * sizeof (int));
529 found = TRUE;
530 /* This narrowing cast from size_t to unsigned int cannot
531 * overflow because we have chosen fds_to_use
532 * to be <= *n_fds */
533 *n_fds = (unsigned int) fds_to_use;
534
535 /* Linux doesn't tell us whether MSG_CMSG_CLOEXEC actually
536 worked, hence we need to go through this list and set
537 CLOEXEC everywhere in any case */
538 for (i = 0; i < fds_to_use; i++)
539 _dbus_fd_set_close_on_exec(fds[i]);
540
541 break;
542 }
543
544 if (!found)
545 *n_fds = 0;
546
547 if (m.msg_flags & MSG_CTRUNC)
548 {
549 unsigned int i;
550
551 /* Hmm, apparently the control data was truncated. The bad
552 thing is that we might have completely lost a couple of fds
553 without chance to recover them. Hence let's treat this as a
554 serious error. */
555
556 /* We still need to close whatever fds we *did* receive,
557 * otherwise they'll never get closed. (CVE-2020-12049) */
558 for (i = 0; i < *n_fds; i++)
559 close (fds[i]);
560
561 *n_fds = 0;
562 errno = ENOSPC;
563 _dbus_string_set_length (buffer, start);
564 return -1;
565 }
566
567 /* put length back (doesn't actually realloc) */
568 _dbus_string_set_length (buffer, start + bytes_read);
569
570#if 0
571 if (bytes_read > 0)
572 _dbus_verbose_bytes_of_string (buffer, start, bytes_read);
573#endif
574
575 return bytes_read;
576 }
577#endif
578}
579
580int
581_dbus_write_socket_with_unix_fds(DBusSocket fd,
582 const DBusString *buffer,
583 int start,
584 int len,
585 const int *fds,
586 int n_fds) {
587
588#ifndef HAVE_UNIX_FD_PASSING
589
590 if (n_fds > 0) {
591 errno = ENOTSUP;
592 return -1;
593 }
594
595 return _dbus_write_socket(fd, buffer, start, len);
596#else
597 return _dbus_write_socket_with_unix_fds_two(fd, buffer, start, len, NULL, 0, 0, fds, n_fds);
598#endif
599}
600
601int
602_dbus_write_socket_with_unix_fds_two(DBusSocket fd,
603 const DBusString *buffer1,
604 int start1,
605 int len1,
606 const DBusString *buffer2,
607 int start2,
608 int len2,
609 const int *fds,
610 int n_fds) {
611
612#ifndef HAVE_UNIX_FD_PASSING
613
614 if (n_fds > 0) {
615 errno = ENOTSUP;
616 return -1;
617 }
618
619 return _dbus_write_socket_two(fd,
620 buffer1, start1, len1,
621 buffer2, start2, len2);
622#else
623
624 struct msghdr m;
625 struct cmsghdr *cm;
626 struct iovec iov[2];
627 int bytes_written;
628
629 _dbus_assert (len1 >= 0);
630 _dbus_assert (len2 >= 0);
631 _dbus_assert (n_fds >= 0);
632
633 _DBUS_ZERO(iov);
634 iov[0].iov_base = (char*) _dbus_string_get_const_data_len (buffer1, start1, len1);
635 iov[0].iov_len = len1;
636
637 if (buffer2)
638 {
639 iov[1].iov_base = (char*) _dbus_string_get_const_data_len (buffer2, start2, len2);
640 iov[1].iov_len = len2;
641 }
642
643 _DBUS_ZERO(m);
644 m.msg_iov = iov;
645 m.msg_iovlen = buffer2 ? 2 : 1;
646
647 if (n_fds > 0)
648 {
649 m.msg_controllen = CMSG_SPACE(n_fds * sizeof(int));
650 m.msg_control = alloca(m.msg_controllen);
651 memset(m.msg_control, 0, m.msg_controllen);
652
653 cm = CMSG_FIRSTHDR(&m);
654 cm->cmsg_level = SOL_SOCKET;
655 cm->cmsg_type = SCM_RIGHTS;
656 cm->cmsg_len = CMSG_LEN(n_fds * sizeof(int));
657 memcpy(CMSG_DATA(cm), fds, n_fds * sizeof(int));
658 }
659
660 again:
661
662 bytes_written = sendmsg (fd.fd, &m, 0
663#if HAVE_DECL_MSG_NOSIGNAL
664 |MSG_NOSIGNAL
665#endif
666 );
667
668 if (bytes_written < 0 && errno == EINTR)
669 goto again;
670
671#if 0
672 if (bytes_written > 0)
673 _dbus_verbose_bytes_of_string (buffer, start, bytes_written);
674#endif
675
676 return bytes_written;
677#endif
678}
679
693int
694_dbus_write_socket_two (DBusSocket fd,
695 const DBusString *buffer1,
696 int start1,
697 int len1,
698 const DBusString *buffer2,
699 int start2,
700 int len2)
701{
702#if HAVE_DECL_MSG_NOSIGNAL
703 struct iovec vectors[2];
704 const char *data1;
705 const char *data2;
706 int bytes_written;
707 struct msghdr m;
708
709 _dbus_assert (buffer1 != NULL);
710 _dbus_assert (start1 >= 0);
711 _dbus_assert (start2 >= 0);
712 _dbus_assert (len1 >= 0);
713 _dbus_assert (len2 >= 0);
714
715 data1 = _dbus_string_get_const_data_len (buffer1, start1, len1);
716
717 if (buffer2 != NULL)
718 data2 = _dbus_string_get_const_data_len (buffer2, start2, len2);
719 else
720 {
721 data2 = NULL;
722 start2 = 0;
723 len2 = 0;
724 }
725
726 vectors[0].iov_base = (char*) data1;
727 vectors[0].iov_len = len1;
728 vectors[1].iov_base = (char*) data2;
729 vectors[1].iov_len = len2;
730
731 _DBUS_ZERO(m);
732 m.msg_iov = vectors;
733 m.msg_iovlen = data2 ? 2 : 1;
734
735 again:
736
737 bytes_written = sendmsg (fd.fd, &m, MSG_NOSIGNAL);
738
739 if (bytes_written < 0 && errno == EINTR)
740 goto again;
741
742 return bytes_written;
743
744#else
745 return _dbus_write_two (fd.fd, buffer1, start1, len1,
746 buffer2, start2, len2);
747#endif
748}
749
766int
767_dbus_read (int fd,
768 DBusString *buffer,
769 int count)
770{
771 int bytes_read;
772 int start;
773 char *data;
774
775 _dbus_assert (count >= 0);
776
777 start = _dbus_string_get_length (buffer);
778
779 if (!_dbus_string_lengthen (buffer, count))
780 {
781 errno = ENOMEM;
782 return -1;
783 }
784
785 data = _dbus_string_get_data_len (buffer, start, count);
786
787 again:
788
789 bytes_read = read (fd, data, count);
790
791 if (bytes_read < 0)
792 {
793 if (errno == EINTR)
794 goto again;
795 else
796 {
797 /* put length back (note that this doesn't actually realloc anything) */
798 _dbus_string_set_length (buffer, start);
799 return -1;
800 }
801 }
802 else
803 {
804 /* put length back (doesn't actually realloc) */
805 _dbus_string_set_length (buffer, start + bytes_read);
806
807#if 0
808 if (bytes_read > 0)
809 _dbus_verbose_bytes_of_string (buffer, start, bytes_read);
810#endif
811
812 return bytes_read;
813 }
814}
815
826int
827_dbus_write (int fd,
828 const DBusString *buffer,
829 int start,
830 int len)
831{
832 const char *data;
833 int bytes_written;
834
835 data = _dbus_string_get_const_data_len (buffer, start, len);
836
837 again:
838
839 bytes_written = write (fd, data, len);
840
841 if (bytes_written < 0 && errno == EINTR)
842 goto again;
843
844#if 0
845 if (bytes_written > 0)
846 _dbus_verbose_bytes_of_string (buffer, start, bytes_written);
847#endif
848
849 return bytes_written;
850}
851
872int
873_dbus_write_two (int fd,
874 const DBusString *buffer1,
875 int start1,
876 int len1,
877 const DBusString *buffer2,
878 int start2,
879 int len2)
880{
881 _dbus_assert (buffer1 != NULL);
882 _dbus_assert (start1 >= 0);
883 _dbus_assert (start2 >= 0);
884 _dbus_assert (len1 >= 0);
885 _dbus_assert (len2 >= 0);
886
887#ifdef HAVE_WRITEV
888 {
889 struct iovec vectors[2];
890 const char *data1;
891 const char *data2;
892 int bytes_written;
893
894 data1 = _dbus_string_get_const_data_len (buffer1, start1, len1);
895
896 if (buffer2 != NULL)
897 data2 = _dbus_string_get_const_data_len (buffer2, start2, len2);
898 else
899 {
900 data2 = NULL;
901 start2 = 0;
902 len2 = 0;
903 }
904
905 vectors[0].iov_base = (char*) data1;
906 vectors[0].iov_len = len1;
907 vectors[1].iov_base = (char*) data2;
908 vectors[1].iov_len = len2;
909
910 again:
911
912 bytes_written = writev (fd,
913 vectors,
914 data2 ? 2 : 1);
915
916 if (bytes_written < 0 && errno == EINTR)
917 goto again;
918
919 return bytes_written;
920 }
921#else /* HAVE_WRITEV */
922 {
923 int ret1, ret2;
924
925 ret1 = _dbus_write (fd, buffer1, start1, len1);
926 if (ret1 == len1 && buffer2 != NULL)
927 {
928 ret2 = _dbus_write (fd, buffer2, start2, len2);
929 if (ret2 < 0)
930 ret2 = 0; /* we can't report an error as the first write was OK */
931
932 return ret1 + ret2;
933 }
934 else
935 return ret1;
936 }
937#endif /* !HAVE_WRITEV */
938}
939
956 DBusSocket
957_dbus_connect_unix_socket (const char *path,
958 dbus_bool_t abstract,
959 DBusError *error)
960{
961 DBusSocket fd = DBUS_SOCKET_INIT;
962 size_t path_len;
963 struct sockaddr_un addr;
964 _DBUS_STATIC_ASSERT (sizeof (addr.sun_path) > _DBUS_MAX_SUN_PATH_LENGTH);
965
966 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
967
968 _dbus_verbose ("connecting to unix socket %s abstract=%d\n",
969 path, abstract);
970
971
972 if (!_dbus_open_unix_socket (&fd.fd, error))
973 {
974 _DBUS_ASSERT_ERROR_IS_SET(error);
975 return fd;
976 }
977 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
978
979 _DBUS_ZERO (addr);
980 addr.sun_family = AF_UNIX;
981 path_len = strlen (path);
982
983 if (abstract)
984 {
985#ifdef __linux__
986 addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
987 path_len++; /* Account for the extra nul byte added to the start of sun_path */
988
989 if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
990 {
991 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
992 "Abstract socket name too long\n");
993 _dbus_close_socket (&fd, NULL);
994 return fd;
995 }
996
997 strncpy (&addr.sun_path[1], path, sizeof (addr.sun_path) - 2);
998 /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
999#else /* !__linux__ */
1000 dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
1001 "Operating system does not support abstract socket namespace\n");
1002 _dbus_close_socket (&fd, NULL);
1003 return fd;
1004#endif /* !__linux__ */
1005 }
1006 else
1007 {
1008 if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
1009 {
1010 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
1011 "Socket name too long\n");
1012 _dbus_close_socket (&fd, NULL);
1013 return fd;
1014 }
1015
1016 strncpy (addr.sun_path, path, sizeof (addr.sun_path) - 1);
1017 }
1018
1019 if (connect (fd.fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
1020 {
1021 dbus_set_error (error,
1022 _dbus_error_from_errno (errno),
1023 "Failed to connect to socket %s: %s",
1024 path, _dbus_strerror (errno));
1025
1026 _dbus_close_socket (&fd, NULL);
1027 return fd;
1028 }
1029
1030 if (!_dbus_set_fd_nonblocking (fd.fd, error))
1031 {
1032 _DBUS_ASSERT_ERROR_IS_SET (error);
1033
1034 _dbus_close_socket (&fd, NULL);
1035 return fd;
1036 }
1037
1038 return fd;
1039}
1040
1053 DBusSocket
1054_dbus_connect_exec (const char *path,
1055 char *const argv[],
1056 DBusError *error)
1057{
1058 DBusSocket s = DBUS_SOCKET_INIT;
1059 int fds[2];
1060 pid_t pid;
1061 int retval;
1062 dbus_bool_t cloexec_done = 0;
1063
1064 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1065
1066 _dbus_verbose ("connecting to process %s\n", path);
1067
1068#ifdef SOCK_CLOEXEC
1069 retval = socketpair (AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, fds);
1070 cloexec_done = (retval >= 0);
1071
1072 if (retval < 0 && (errno == EINVAL || errno == EPROTOTYPE))
1073#endif
1074 {
1075 retval = socketpair (AF_UNIX, SOCK_STREAM, 0, fds);
1076 }
1077
1078 if (retval < 0)
1079 {
1080 dbus_set_error (error,
1081 _dbus_error_from_errno (errno),
1082 "Failed to create socket pair: %s",
1083 _dbus_strerror (errno));
1084 _dbus_assert (!_dbus_socket_is_valid (s));
1085 return s;
1086 }
1087
1088 if (!cloexec_done)
1089 {
1090 _dbus_fd_set_close_on_exec (fds[0]);
1091 _dbus_fd_set_close_on_exec (fds[1]);
1092 }
1093
1094 /* Make sure our output buffers aren't redundantly printed by both the
1095 * parent and the child */
1096 fflush (stdout);
1097 fflush (stderr);
1098
1099 pid = fork ();
1100 if (pid < 0)
1101 {
1102 dbus_set_error (error,
1103 _dbus_error_from_errno (errno),
1104 "Failed to fork() to call %s: %s",
1105 path, _dbus_strerror (errno));
1106 close (fds[0]);
1107 close (fds[1]);
1108 _dbus_assert (!_dbus_socket_is_valid (s));
1109 return s;
1110 }
1111
1112 if (pid == 0)
1113 {
1114 /* child */
1115 close (fds[0]);
1116
1117 dup2 (fds[1], STDIN_FILENO);
1118 dup2 (fds[1], STDOUT_FILENO);
1119
1120 if (fds[1] != STDIN_FILENO &&
1121 fds[1] != STDOUT_FILENO)
1122 close (fds[1]);
1123
1124 /* Inherit STDERR and the controlling terminal from the
1125 parent */
1126
1127 _dbus_close_all ();
1128
1129 execvp (path, (char * const *) argv);
1130
1131 fprintf (stderr, "Failed to execute process %s: %s\n", path, _dbus_strerror (errno));
1132
1133 _exit(1);
1134 }
1135
1136 /* parent */
1137 close (fds[1]);
1138
1139 if (!_dbus_set_fd_nonblocking (fds[0], error))
1140 {
1141 _DBUS_ASSERT_ERROR_IS_SET (error);
1142
1143 close (fds[0]);
1144 _dbus_assert (!_dbus_socket_is_valid (s));
1145 return s;
1146 }
1147
1148 s.fd = fds[0];
1149 return s;
1150}
1151
1169 DBusSocket
1170_dbus_listen_unix_socket (const char *path,
1171 dbus_bool_t abstract,
1172 DBusError *error)
1173{
1174 DBusSocket s = DBUS_SOCKET_INIT;
1175 int listen_fd;
1176 struct sockaddr_un addr;
1177 size_t path_len;
1178 _DBUS_STATIC_ASSERT (sizeof (addr.sun_path) > _DBUS_MAX_SUN_PATH_LENGTH);
1179
1180 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1181
1182 _dbus_verbose ("listening on unix socket %s abstract=%d\n",
1183 path, abstract);
1184
1185 if (!_dbus_open_unix_socket (&listen_fd, error))
1186 {
1187 _DBUS_ASSERT_ERROR_IS_SET(error);
1188 return s;
1189 }
1190 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1191
1192 _DBUS_ZERO (addr);
1193 addr.sun_family = AF_UNIX;
1194 path_len = strlen (path);
1195
1196 if (abstract)
1197 {
1198#ifdef __linux__
1199 /* remember that abstract names aren't nul-terminated so we rely
1200 * on sun_path being filled in with zeroes above.
1201 */
1202 addr.sun_path[0] = '\0'; /* this is what says "use abstract" */
1203 path_len++; /* Account for the extra nul byte added to the start of sun_path */
1204
1205 if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
1206 {
1207 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
1208 "Abstract socket name too long\n");
1209 _dbus_close (listen_fd, NULL);
1210 return s;
1211 }
1212
1213 strncpy (&addr.sun_path[1], path, sizeof (addr.sun_path) - 2);
1214 /* _dbus_verbose_bytes (addr.sun_path, sizeof (addr.sun_path)); */
1215#else /* !__linux__ */
1216 dbus_set_error (error, DBUS_ERROR_NOT_SUPPORTED,
1217 "Operating system does not support abstract socket namespace\n");
1218 _dbus_close (listen_fd, NULL);
1219 return s;
1220#endif /* !__linux__ */
1221 }
1222 else
1223 {
1224 /* Discussed security implications of this with Nalin,
1225 * and we couldn't think of where it would kick our ass, but
1226 * it still seems a bit sucky. It also has non-security suckage;
1227 * really we'd prefer to exit if the socket is already in use.
1228 * But there doesn't seem to be a good way to do this.
1229 *
1230 * Just to be extra careful, I threw in the stat() - clearly
1231 * the stat() can't *fix* any security issue, but it at least
1232 * avoids inadvertent/accidental data loss.
1233 */
1234 {
1235 struct stat sb;
1236
1237 if (stat (path, &sb) == 0 &&
1238 S_ISSOCK (sb.st_mode))
1239 unlink (path);
1240 }
1241
1242 if (path_len > _DBUS_MAX_SUN_PATH_LENGTH)
1243 {
1244 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
1245 "Socket name too long\n");
1246 _dbus_close (listen_fd, NULL);
1247 return s;
1248 }
1249
1250 strncpy (addr.sun_path, path, sizeof (addr.sun_path) - 1);
1251 }
1252
1253 if (bind (listen_fd, (struct sockaddr*) &addr, _DBUS_STRUCT_OFFSET (struct sockaddr_un, sun_path) + path_len) < 0)
1254 {
1255 dbus_set_error (error, _dbus_error_from_errno (errno),
1256 "Failed to bind socket \"%s\": %s",
1257 path, _dbus_strerror (errno));
1258 _dbus_close (listen_fd, NULL);
1259 return s;
1260 }
1261
1262 if (listen (listen_fd, SOMAXCONN /* backlog */) < 0)
1263 {
1264 dbus_set_error (error, _dbus_error_from_errno (errno),
1265 "Failed to listen on socket \"%s\": %s",
1266 path, _dbus_strerror (errno));
1267 _dbus_close (listen_fd, NULL);
1268 return s;
1269 }
1270
1271 if (!_dbus_set_fd_nonblocking (listen_fd, error))
1272 {
1273 _DBUS_ASSERT_ERROR_IS_SET (error);
1274 _dbus_close (listen_fd, NULL);
1275 return s;
1276 }
1277
1278 /* Try opening up the permissions, but if we can't, just go ahead
1279 * and continue, maybe it will be good enough.
1280 */
1281 if (!abstract && chmod (path, 0777) < 0)
1282 _dbus_warn ("Could not set mode 0777 on socket %s", path);
1283
1284 s.fd = listen_fd;
1285 return s;
1286}
1287
1298int
1299_dbus_listen_systemd_sockets (DBusSocket **fds,
1300 DBusError *error)
1301{
1302#ifdef HAVE_SYSTEMD
1303 int r, n;
1304 int fd;
1305 DBusSocket *new_fds;
1306
1307 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1308
1309 n = sd_listen_fds (TRUE);
1310 if (n < 0)
1311 {
1312 dbus_set_error (error, _dbus_error_from_errno (-n),
1313 "Failed to acquire systemd socket: %s",
1314 _dbus_strerror (-n));
1315 return -1;
1316 }
1317
1318 if (n <= 0)
1319 {
1320 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
1321 "No socket received.");
1322 return -1;
1323 }
1324
1325 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1326 {
1327 r = sd_is_socket (fd, AF_UNSPEC, SOCK_STREAM, 1);
1328 if (r < 0)
1329 {
1330 dbus_set_error (error, _dbus_error_from_errno (-r),
1331 "Failed to verify systemd socket type: %s",
1332 _dbus_strerror (-r));
1333 return -1;
1334 }
1335
1336 if (!r)
1337 {
1338 dbus_set_error (error, DBUS_ERROR_BAD_ADDRESS,
1339 "Passed socket has wrong type.");
1340 return -1;
1341 }
1342 }
1343
1344 /* OK, the file descriptors are all good, so let's take posession of
1345 them then. */
1346
1347 new_fds = dbus_new (DBusSocket, n);
1348 if (!new_fds)
1349 {
1350 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
1351 "Failed to allocate file handle array.");
1352 goto fail;
1353 }
1354
1355 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1356 {
1357 if (!_dbus_set_fd_nonblocking (fd, error))
1358 {
1359 _DBUS_ASSERT_ERROR_IS_SET (error);
1360 goto fail;
1361 }
1362
1363 new_fds[fd - SD_LISTEN_FDS_START].fd = fd;
1364 }
1365
1366 *fds = new_fds;
1367 return n;
1368
1369 fail:
1370
1371 for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd ++)
1372 {
1373 _dbus_close (fd, NULL);
1374 }
1375
1376 dbus_free (new_fds);
1377 return -1;
1378#else
1379 dbus_set_error_const (error, DBUS_ERROR_NOT_SUPPORTED,
1380 "dbus was compiled without systemd support");
1381 return -1;
1382#endif
1383}
1384
1385/* Convert an error code from getaddrinfo() or getnameinfo() into
1386 * a D-Bus error name. */
1387static const char *
1388_dbus_error_from_gai (int gai_res,
1389 int saved_errno)
1390{
1391 switch (gai_res)
1392 {
1393#ifdef EAI_FAMILY
1394 case EAI_FAMILY:
1395 /* ai_family not supported (at all) */
1396 return DBUS_ERROR_NOT_SUPPORTED;
1397#endif
1398
1399#ifdef EAI_SOCKTYPE
1400 case EAI_SOCKTYPE:
1401 /* ai_socktype not supported (at all) */
1402 return DBUS_ERROR_NOT_SUPPORTED;
1403#endif
1404
1405#ifdef EAI_MEMORY
1406 case EAI_MEMORY:
1407 /* Out of memory */
1408 return DBUS_ERROR_NO_MEMORY;
1409#endif
1410
1411#ifdef EAI_SYSTEM
1412 case EAI_SYSTEM:
1413 /* Unspecified system error, details in errno */
1414 return _dbus_error_from_errno (saved_errno);
1415#endif
1416
1417 case 0:
1418 /* It succeeded, but we didn't get any addresses? */
1419 return DBUS_ERROR_FAILED;
1420
1421 /* EAI_AGAIN: Transient failure */
1422 /* EAI_BADFLAGS: invalid ai_flags (programming error) */
1423 /* EAI_FAIL: Non-recoverable failure */
1424 /* EAI_NODATA: host exists but has no addresses */
1425 /* EAI_NONAME: host does not exist */
1426 /* EAI_OVERFLOW: argument buffer overflow */
1427 /* EAI_SERVICE: service not available for specified socket
1428 * type (we should never see this because we use numeric
1429 * ports) */
1430 default:
1431 return DBUS_ERROR_FAILED;
1432 }
1433}
1434
1448 DBusSocket
1449_dbus_connect_tcp_socket (const char *host,
1450 const char *port,
1451 const char *family,
1452 DBusError *error)
1453{
1454 return _dbus_connect_tcp_socket_with_nonce (host, port, family, (const char*)NULL, error);
1455}
1456
1457 DBusSocket
1458_dbus_connect_tcp_socket_with_nonce (const char *host,
1459 const char *port,
1460 const char *family,
1461 const char *noncefile,
1462 DBusError *error)
1463{
1464 int saved_errno = 0;
1465 DBusList *connect_errors = NULL;
1466 DBusSocket fd = DBUS_SOCKET_INIT;
1467 int res;
1468 struct addrinfo hints;
1469 struct addrinfo *ai = NULL;
1470 const struct addrinfo *tmp;
1471 DBusError *connect_error;
1472
1473 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1474
1475 _DBUS_ZERO (hints);
1476
1477 if (!family)
1478 hints.ai_family = AF_UNSPEC;
1479 else if (!strcmp(family, "ipv4"))
1480 hints.ai_family = AF_INET;
1481 else if (!strcmp(family, "ipv6"))
1482 hints.ai_family = AF_INET6;
1483 else
1484 {
1485 dbus_set_error (error,
1486 DBUS_ERROR_BAD_ADDRESS,
1487 "Unknown address family %s", family);
1488 return _dbus_socket_get_invalid ();
1489 }
1490 hints.ai_protocol = IPPROTO_TCP;
1491 hints.ai_socktype = SOCK_STREAM;
1492 hints.ai_flags = AI_ADDRCONFIG;
1493
1494 if ((res = getaddrinfo(host, port, &hints, &ai)) != 0)
1495 {
1496 dbus_set_error (error,
1497 _dbus_error_from_gai (res, errno),
1498 "Failed to lookup host/port: \"%s:%s\": %s (%d)",
1499 host, port, gai_strerror(res), res);
1500 goto out;
1501 }
1502
1503 tmp = ai;
1504 while (tmp)
1505 {
1506 if (!_dbus_open_socket (&fd.fd, tmp->ai_family, SOCK_STREAM, 0, error))
1507 {
1508 _DBUS_ASSERT_ERROR_IS_SET(error);
1509 _dbus_socket_invalidate (&fd);
1510 goto out;
1511 }
1512 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1513
1514 if (connect (fd.fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
1515 {
1516 saved_errno = errno;
1517 _dbus_close_socket (&fd, NULL);
1518
1519 connect_error = dbus_new0 (DBusError, 1);
1520
1521 if (connect_error == NULL)
1522 {
1523 _DBUS_SET_OOM (error);
1524 goto out;
1525 }
1526
1527 dbus_error_init (connect_error);
1528 _dbus_set_error_with_inet_sockaddr (connect_error,
1529 tmp->ai_addr, tmp->ai_addrlen,
1530 "Failed to connect to socket",
1531 saved_errno);
1532
1533 if (!_dbus_list_append (&connect_errors, connect_error))
1534 {
1535 dbus_error_free (connect_error);
1536 dbus_free (connect_error);
1537 _DBUS_SET_OOM (error);
1538 goto out;
1539 }
1540
1541 tmp = tmp->ai_next;
1542 continue;
1543 }
1544
1545 break;
1546 }
1547
1548 if (!_dbus_socket_is_valid (fd))
1549 {
1550 _dbus_combine_tcp_errors (&connect_errors, "Failed to connect",
1551 host, port, error);
1552 goto out;
1553 }
1554
1555 if (noncefile != NULL)
1556 {
1557 DBusString noncefileStr;
1558 dbus_bool_t ret;
1559 _dbus_string_init_const (&noncefileStr, noncefile);
1560 ret = _dbus_send_nonce (fd, &noncefileStr, error);
1561
1562 if (!ret)
1563 {
1564 _dbus_close_socket (&fd, NULL);
1565 goto out;
1566 }
1567 }
1568
1569 if (!_dbus_set_fd_nonblocking (fd.fd, error))
1570 {
1571 _dbus_close_socket (&fd, NULL);
1572 goto out;
1573 }
1574
1575out:
1576 if (ai != NULL)
1577 freeaddrinfo (ai);
1578
1579 while ((connect_error = _dbus_list_pop_first (&connect_errors)))
1580 {
1581 dbus_error_free (connect_error);
1582 dbus_free (connect_error);
1583 }
1584
1585 return fd;
1586}
1587
1605int
1606_dbus_listen_tcp_socket (const char *host,
1607 const char *port,
1608 const char *family,
1609 DBusString *retport,
1610 const char **retfamily,
1611 DBusSocket **fds_p,
1612 DBusError *error)
1613{
1614 int saved_errno;
1615 int nlisten_fd = 0, res, i;
1616 DBusList *bind_errors = NULL;
1617 DBusError *bind_error = NULL;
1618 DBusSocket *listen_fd = NULL;
1619 struct addrinfo hints;
1620 struct addrinfo *ai, *tmp;
1621 unsigned int reuseaddr;
1622 dbus_bool_t have_ipv4 = FALSE;
1623 dbus_bool_t have_ipv6 = FALSE;
1624
1625 *fds_p = NULL;
1626 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1627
1628 _DBUS_ZERO (hints);
1629
1630 if (!family)
1631 hints.ai_family = AF_UNSPEC;
1632 else if (!strcmp(family, "ipv4"))
1633 hints.ai_family = AF_INET;
1634 else if (!strcmp(family, "ipv6"))
1635 hints.ai_family = AF_INET6;
1636 else
1637 {
1638 dbus_set_error (error,
1639 DBUS_ERROR_BAD_ADDRESS,
1640 "Unknown address family %s", family);
1641 return -1;
1642 }
1643
1644 hints.ai_protocol = IPPROTO_TCP;
1645 hints.ai_socktype = SOCK_STREAM;
1646 hints.ai_flags = AI_ADDRCONFIG | AI_PASSIVE;
1647
1648 redo_lookup_with_port:
1649 ai = NULL;
1650 if ((res = getaddrinfo(host, port, &hints, &ai)) != 0 || !ai)
1651 {
1652 dbus_set_error (error,
1653 _dbus_error_from_gai (res, errno),
1654 "Failed to lookup host/port: \"%s:%s\": %s (%d)",
1655 host ? host : "*", port ? port : "0", gai_strerror(res), res);
1656 goto failed;
1657 }
1658
1659 tmp = ai;
1660 while (tmp)
1661 {
1662 int fd = -1, tcp_nodelay_on;
1663 DBusSocket *newlisten_fd;
1664
1665 if (!_dbus_open_socket (&fd, tmp->ai_family, SOCK_STREAM, 0, error))
1666 {
1667 _DBUS_ASSERT_ERROR_IS_SET(error);
1668 goto failed;
1669 }
1670 _DBUS_ASSERT_ERROR_IS_CLEAR(error);
1671
1672 reuseaddr = 1;
1673 if (setsockopt (fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr, sizeof(reuseaddr))==-1)
1674 {
1675 _dbus_warn ("Failed to set socket option \"%s:%s\": %s",
1676 host ? host : "*", port ? port : "0", _dbus_strerror (errno));
1677 }
1678
1679 /* Nagle's algorithm imposes a huge delay on the initial messages
1680 going over TCP. */
1681 tcp_nodelay_on = 1;
1682 if (setsockopt (fd, IPPROTO_TCP, TCP_NODELAY, &tcp_nodelay_on, sizeof (tcp_nodelay_on)) == -1)
1683 {
1684 _dbus_warn ("Failed to set TCP_NODELAY socket option \"%s:%s\": %s",
1685 host ? host : "*", port ? port : "0", _dbus_strerror (errno));
1686 }
1687
1688 if (bind (fd, (struct sockaddr*) tmp->ai_addr, tmp->ai_addrlen) < 0)
1689 {
1690 saved_errno = errno;
1691 _dbus_close(fd, NULL);
1692
1693 /*
1694 * We don't treat this as a fatal error, because there might be
1695 * other addresses that we can listen on. In particular:
1696 *
1697 * - If saved_errno is EADDRINUSE after we
1698 * "goto redo_lookup_with_port" after binding a port on one of the
1699 * possible addresses, we will try to bind that same port on
1700 * every address, including the same address again for a second
1701 * time, which will fail with EADDRINUSE.
1702 *
1703 * - If saved_errno is EADDRINUSE, it might be because binding to
1704 * an IPv6 address implicitly binds to a corresponding IPv4
1705 * address or vice versa (e.g. Linux with bindv6only=0).
1706 *
1707 * - If saved_errno is EADDRNOTAVAIL when we asked for family
1708 * AF_UNSPEC, it might be because IPv6 is disabled for this
1709 * particular interface (e.g. Linux with
1710 * /proc/sys/net/ipv6/conf/lo/disable_ipv6).
1711 */
1712 bind_error = dbus_new0 (DBusError, 1);
1713
1714 if (bind_error == NULL)
1715 {
1716 _DBUS_SET_OOM (error);
1717 goto failed;
1718 }
1719
1720 dbus_error_init (bind_error);
1721 _dbus_set_error_with_inet_sockaddr (bind_error, tmp->ai_addr, tmp->ai_addrlen,
1722 "Failed to bind socket",
1723 saved_errno);
1724
1725 if (!_dbus_list_append (&bind_errors, bind_error))
1726 {
1727 dbus_error_free (bind_error);
1728 dbus_free (bind_error);
1729 _DBUS_SET_OOM (error);
1730 goto failed;
1731 }
1732
1733 /* Try the next address, maybe it will work better */
1734 tmp = tmp->ai_next;
1735 continue;
1736 }
1737
1738 if (listen (fd, 30 /* backlog */) < 0)
1739 {
1740 saved_errno = errno;
1741 _dbus_close (fd, NULL);
1742 _dbus_set_error_with_inet_sockaddr (error, tmp->ai_addr, tmp->ai_addrlen,
1743 "Failed to listen on socket",
1744 saved_errno);
1745 goto failed;
1746 }
1747
1748 newlisten_fd = dbus_realloc(listen_fd, sizeof(DBusSocket)*(nlisten_fd+1));
1749 if (!newlisten_fd)
1750 {
1751 _dbus_close (fd, NULL);
1752 dbus_set_error (error, DBUS_ERROR_NO_MEMORY,
1753 "Failed to allocate file handle array");
1754 goto failed;
1755 }
1756 listen_fd = newlisten_fd;
1757 listen_fd[nlisten_fd].fd = fd;
1758 nlisten_fd++;
1759
1760 if (tmp->ai_addr->sa_family == AF_INET)
1761 have_ipv4 = TRUE;
1762 else if (tmp->ai_addr->sa_family == AF_INET6)
1763 have_ipv6 = TRUE;
1764
1765 if (!_dbus_string_get_length(retport))
1766 {
1767 /* If the user didn't specify a port, or used 0, then
1768 the kernel chooses a port. After the first address
1769 is bound to, we need to force all remaining addresses
1770 to use the same port */
1771 if (!port || !strcmp(port, "0"))
1772 {
1773 int result;
1774 struct sockaddr_storage addr;
1775 socklen_t addrlen;
1776 char portbuf[50];
1777
1778 addrlen = sizeof(addr);
1779 result = getsockname(fd, (struct sockaddr*) &addr, &addrlen);
1780
1781 if (result == -1)
1782 {
1783 saved_errno = errno;
1784 dbus_set_error (error, _dbus_error_from_errno (saved_errno),
1785 "Failed to retrieve socket name for \"%s:%s\": %s",
1786 host ? host : "*", port ? port : "0", _dbus_strerror (saved_errno));
1787 goto failed;
1788 }
1789
1790 if ((res = getnameinfo ((struct sockaddr*)&addr, addrlen, NULL, 0,
1791 portbuf, sizeof(portbuf),
1792 NI_NUMERICHOST | NI_NUMERICSERV)) != 0)
1793 {
1794 saved_errno = errno;
1795 dbus_set_error (error, _dbus_error_from_gai (res, saved_errno),
1796 "Failed to resolve port \"%s:%s\": %s (%d)",
1797 host ? host : "*", port ? port : "0", gai_strerror(res), res);
1798 goto failed;
1799 }
1800
1801 if (!_dbus_string_append(retport, portbuf))
1802 {
1803 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1804 goto failed;
1805 }
1806
1807 /* Release current address list & redo lookup */
1808 port = _dbus_string_get_const_data(retport);
1809 freeaddrinfo(ai);
1810 goto redo_lookup_with_port;
1811 }
1812 else
1813 {
1814 if (!_dbus_string_append(retport, port))
1815 {
1816 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
1817 goto failed;
1818 }
1819 }
1820 }
1821
1822 tmp = tmp->ai_next;
1823 }
1824 freeaddrinfo(ai);
1825 ai = NULL;
1826
1827 if (!nlisten_fd)
1828 {
1829 _dbus_combine_tcp_errors (&bind_errors, "Failed to bind", host,
1830 port, error);
1831 goto failed;
1832 }
1833
1834 if (have_ipv4 && !have_ipv6)
1835 *retfamily = "ipv4";
1836 else if (!have_ipv4 && have_ipv6)
1837 *retfamily = "ipv6";
1838
1839 for (i = 0 ; i < nlisten_fd ; i++)
1840 {
1841 if (!_dbus_set_fd_nonblocking (listen_fd[i].fd, error))
1842 {
1843 goto failed;
1844 }
1845 }
1846
1847 *fds_p = listen_fd;
1848
1849 /* This list might be non-empty even on success, because we might be
1850 * ignoring EADDRINUSE or EADDRNOTAVAIL */
1851 while ((bind_error = _dbus_list_pop_first (&bind_errors)))
1852 {
1853 dbus_error_free (bind_error);
1854 dbus_free (bind_error);
1855 }
1856
1857 return nlisten_fd;
1858
1859 failed:
1860 if (ai)
1861 freeaddrinfo(ai);
1862 for (i = 0 ; i < nlisten_fd ; i++)
1863 _dbus_close(listen_fd[i].fd, NULL);
1864
1865 while ((bind_error = _dbus_list_pop_first (&bind_errors)))
1866 {
1867 dbus_error_free (bind_error);
1868 dbus_free (bind_error);
1869 }
1870
1871 dbus_free(listen_fd);
1872 return -1;
1873}
1874
1875static dbus_bool_t
1876write_credentials_byte (int server_fd,
1877 DBusError *error)
1878{
1879 int bytes_written;
1880 char buf[1] = { '\0' };
1881#if defined(HAVE_CMSGCRED)
1882 union {
1883 struct cmsghdr hdr;
1884 char cred[CMSG_SPACE (sizeof (struct cmsgcred))];
1885 } cmsg;
1886 struct iovec iov;
1887 struct msghdr msg;
1888 iov.iov_base = buf;
1889 iov.iov_len = 1;
1890
1891 _DBUS_ZERO(msg);
1892 msg.msg_iov = &iov;
1893 msg.msg_iovlen = 1;
1894
1895 msg.msg_control = (caddr_t) &cmsg;
1896 msg.msg_controllen = CMSG_SPACE (sizeof (struct cmsgcred));
1897 _DBUS_ZERO(cmsg);
1898 cmsg.hdr.cmsg_len = CMSG_LEN (sizeof (struct cmsgcred));
1899 cmsg.hdr.cmsg_level = SOL_SOCKET;
1900 cmsg.hdr.cmsg_type = SCM_CREDS;
1901#endif
1902
1903 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
1904
1905 again:
1906
1907#if defined(HAVE_CMSGCRED)
1908 bytes_written = sendmsg (server_fd, &msg, 0
1909#if HAVE_DECL_MSG_NOSIGNAL
1910 |MSG_NOSIGNAL
1911#endif
1912 );
1913
1914 /* If we HAVE_CMSGCRED, the OS still might not let us sendmsg()
1915 * with a SOL_SOCKET/SCM_CREDS message - for instance, FreeBSD
1916 * only allows that on AF_UNIX. Try just doing a send() instead. */
1917 if (bytes_written < 0 && errno == EINVAL)
1918#endif
1919 {
1920 bytes_written = send (server_fd, buf, 1, 0
1921#if HAVE_DECL_MSG_NOSIGNAL
1922 |MSG_NOSIGNAL
1923#endif
1924 );
1925 }
1926
1927 if (bytes_written < 0 && errno == EINTR)
1928 goto again;
1929
1930 if (bytes_written < 0)
1931 {
1932 dbus_set_error (error, _dbus_error_from_errno (errno),
1933 "Failed to write credentials byte: %s",
1934 _dbus_strerror (errno));
1935 return FALSE;
1936 }
1937 else if (bytes_written == 0)
1938 {
1939 dbus_set_error (error, DBUS_ERROR_IO_ERROR,
1940 "wrote zero bytes writing credentials byte");
1941 return FALSE;
1942 }
1943 else
1944 {
1945 _dbus_assert (bytes_written == 1);
1946 _dbus_verbose ("wrote credentials byte\n");
1947 return TRUE;
1948 }
1949}
1950
1951/* return FALSE on OOM, TRUE otherwise, even if no groups were found */
1952static dbus_bool_t
1953add_groups_to_credentials (int client_fd,
1954 DBusCredentials *credentials,
1955 dbus_gid_t primary)
1956{
1957#if defined(__linux__) && defined(SO_PEERGROUPS)
1958 _DBUS_STATIC_ASSERT (sizeof (gid_t) <= sizeof (dbus_gid_t));
1959 /* This function assumes socklen_t is unsigned, which is true on Linux */
1960 _DBUS_STATIC_ASSERT (((socklen_t) -1) > 0);
1961 gid_t *buf = NULL;
1962 socklen_t len = 1024;
1963 dbus_bool_t oom = FALSE;
1964 /* libdbus has a different representation of group IDs just to annoy you */
1965 dbus_gid_t *converted_gids = NULL;
1966 dbus_bool_t need_primary = TRUE;
1967 size_t n_gids;
1968 size_t i;
1969
1970 n_gids = ((size_t) len) / sizeof (gid_t);
1971 buf = dbus_new (gid_t, n_gids);
1972
1973 if (buf == NULL)
1974 return FALSE;
1975
1976 while (getsockopt (client_fd, SOL_SOCKET, SO_PEERGROUPS, buf, &len) < 0)
1977 {
1978 int e = errno;
1979 gid_t *replacement;
1980
1981 _dbus_verbose ("getsockopt failed with %s, len now %lu\n",
1982 _dbus_strerror (e), (unsigned long) len);
1983
1984 if (e != ERANGE || (size_t) len <= n_gids * sizeof (gid_t))
1985 {
1986 _dbus_verbose ("Failed to getsockopt(SO_PEERGROUPS): %s\n",
1987 _dbus_strerror (e));
1988 goto out;
1989 }
1990
1991 /* If not enough space, len is updated to be enough.
1992 * Try again with a large enough buffer. */
1993 n_gids = ((size_t) len) / sizeof (gid_t);
1994 replacement = dbus_realloc (buf, len);
1995
1996 if (replacement == NULL)
1997 {
1998 oom = TRUE;
1999 goto out;
2000 }
2001
2002 buf = replacement;
2003 _dbus_verbose ("will try again with %lu\n", (unsigned long) len);
2004 }
2005
2006 if (len > n_gids * sizeof (gid_t))
2007 {
2008 _dbus_verbose ("%lu > %zu", (unsigned long) len, n_gids * sizeof (gid_t));
2009 _dbus_assert_not_reached ("getsockopt(SO_PEERGROUPS) overflowed");
2010 }
2011
2012 if (len % sizeof (gid_t) != 0)
2013 {
2014 _dbus_verbose ("getsockopt(SO_PEERGROUPS) did not return an "
2015 "integer multiple of sizeof(gid_t): %lu should be "
2016 "divisible by %zu",
2017 (unsigned long) len, sizeof (gid_t));
2018 goto out;
2019 }
2020
2021 /* Allocate an extra space for the primary group ID */
2022 n_gids = ((size_t) len) / sizeof (gid_t);
2023
2024 /* If n_gids is less than this, then (n_gids + 1) certainly doesn't
2025 * overflow, and neither does multiplying that by sizeof(dbus_gid_t).
2026 * This is using _DBUS_INT32_MAX as a conservative lower bound for
2027 * the maximum size_t. */
2028 if (n_gids >= (_DBUS_INT32_MAX / sizeof (dbus_gid_t)) - 1)
2029 {
2030 _dbus_verbose ("getsockopt(SO_PEERGROUPS) returned a huge number "
2031 "of groups (%lu bytes), ignoring",
2032 (unsigned long) len);
2033 goto out;
2034 }
2035
2036 converted_gids = dbus_new (dbus_gid_t, n_gids + 1);
2037
2038 if (converted_gids == NULL)
2039 {
2040 oom = TRUE;
2041 goto out;
2042 }
2043
2044 for (i = 0; i < n_gids; i++)
2045 {
2046 converted_gids[i] = (dbus_gid_t) buf[i];
2047
2048 if (converted_gids[i] == primary)
2049 need_primary = FALSE;
2050 }
2051
2052 if (need_primary && primary != DBUS_GID_UNSET)
2053 {
2054 converted_gids[n_gids] = primary;
2055 n_gids++;
2056 }
2057
2058 _dbus_credentials_take_unix_gids (credentials, converted_gids, n_gids);
2059
2060out:
2061 dbus_free (buf);
2062 return !oom;
2063#else
2064 /* no error */
2065 return TRUE;
2066#endif
2067}
2068
2069/* return FALSE on OOM, TRUE otherwise, even if no credentials were found */
2070static dbus_bool_t
2071add_linux_security_label_to_credentials (int client_fd,
2072 DBusCredentials *credentials)
2073{
2074#if defined(__linux__) && defined(SO_PEERSEC)
2075 DBusString buf;
2076 socklen_t len = 1024;
2077 dbus_bool_t oom = FALSE;
2078
2079 if (!_dbus_string_init_preallocated (&buf, len) ||
2080 !_dbus_string_set_length (&buf, len))
2081 return FALSE;
2082
2083 while (getsockopt (client_fd, SOL_SOCKET, SO_PEERSEC,
2084 _dbus_string_get_data (&buf), &len) < 0)
2085 {
2086 int e = errno;
2087
2088 _dbus_verbose ("getsockopt failed with %s, len now %lu\n",
2089 _dbus_strerror (e), (unsigned long) len);
2090
2091 if (e != ERANGE || len <= _dbus_string_get_length_uint (&buf))
2092 {
2093 _dbus_verbose ("Failed to getsockopt(SO_PEERSEC): %s\n",
2094 _dbus_strerror (e));
2095 goto out;
2096 }
2097
2098 /* If not enough space, len is updated to be enough.
2099 * Try again with a large enough buffer. */
2100 if (!_dbus_string_set_length (&buf, len))
2101 {
2102 oom = TRUE;
2103 goto out;
2104 }
2105
2106 _dbus_verbose ("will try again with %lu\n", (unsigned long) len);
2107 }
2108
2109 if (len <= 0)
2110 {
2111 _dbus_verbose ("getsockopt(SO_PEERSEC) yielded <= 0 bytes: %lu\n",
2112 (unsigned long) len);
2113 goto out;
2114 }
2115
2116 if (len > _dbus_string_get_length_uint (&buf))
2117 {
2118 _dbus_verbose ("%lu > %u", (unsigned long) len,
2119 _dbus_string_get_length_uint (&buf));
2120 _dbus_assert_not_reached ("getsockopt(SO_PEERSEC) overflowed");
2121 }
2122
2123 if (_dbus_string_get_byte (&buf, len - 1) == 0)
2124 {
2125 /* the kernel included the trailing \0 in its count,
2126 * but DBusString always has an extra \0 after the data anyway */
2127 _dbus_verbose ("subtracting trailing \\0\n");
2128 len--;
2129 }
2130
2131 if (!_dbus_string_set_length (&buf, len))
2132 {
2133 _dbus_assert_not_reached ("shortening string should not lead to OOM");
2134 oom = TRUE;
2135 goto out;
2136 }
2137
2138 if (strlen (_dbus_string_get_const_data (&buf)) != len)
2139 {
2140 /* LSM people on the linux-security-module@ mailing list say this
2141 * should never happen: the label should be a bytestring with
2142 * an optional trailing \0 */
2143 _dbus_verbose ("security label from kernel had an embedded \\0, "
2144 "ignoring it\n");
2145 goto out;
2146 }
2147
2148 _dbus_verbose ("getsockopt(SO_PEERSEC): %lu bytes excluding \\0: %s\n",
2149 (unsigned long) len,
2150 _dbus_string_get_const_data (&buf));
2151
2152 if (!_dbus_credentials_add_linux_security_label (credentials,
2153 _dbus_string_get_const_data (&buf)))
2154 {
2155 oom = TRUE;
2156 goto out;
2157 }
2158
2159out:
2160 _dbus_string_free (&buf);
2161 return !oom;
2162#else
2163 /* no error */
2164 return TRUE;
2165#endif
2166}
2167
2208 dbus_bool_t
2209_dbus_read_credentials_socket (DBusSocket client_fd,
2210 DBusCredentials *credentials,
2211 DBusError *error)
2212{
2213 struct msghdr msg;
2214 struct iovec iov;
2215 char buf;
2216 dbus_uid_t uid_read;
2217 dbus_gid_t primary_gid_read;
2218 dbus_pid_t pid_read;
2219 int bytes_read;
2220 int pid_fd_read;
2221
2222#ifdef HAVE_CMSGCRED
2223 union {
2224 struct cmsghdr hdr;
2225 char cred[CMSG_SPACE (sizeof (struct cmsgcred))];
2226 } cmsg;
2227#endif
2228
2229 /* The POSIX spec certainly doesn't promise this, but
2230 * we need these assertions to fail as soon as we're wrong about
2231 * it so we can do the porting fixups
2232 */
2233 _DBUS_STATIC_ASSERT (sizeof (pid_t) <= sizeof (dbus_pid_t));
2234 _DBUS_STATIC_ASSERT (sizeof (uid_t) <= sizeof (dbus_uid_t));
2235 _DBUS_STATIC_ASSERT (sizeof (gid_t) <= sizeof (dbus_gid_t));
2236
2237 uid_read = DBUS_UID_UNSET;
2238 primary_gid_read = DBUS_GID_UNSET;
2239 pid_read = DBUS_PID_UNSET;
2240 pid_fd_read = -1;
2241
2242 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2243
2244 _dbus_credentials_clear (credentials);
2245
2246 iov.iov_base = &buf;
2247 iov.iov_len = 1;
2248
2249 _DBUS_ZERO(msg);
2250 msg.msg_iov = &iov;
2251 msg.msg_iovlen = 1;
2252
2253#if defined(HAVE_CMSGCRED)
2254 _DBUS_ZERO(cmsg);
2255 msg.msg_control = (caddr_t) &cmsg;
2256 msg.msg_controllen = CMSG_SPACE (sizeof (struct cmsgcred));
2257#endif
2258
2259 again:
2260 bytes_read = recvmsg (client_fd.fd, &msg, 0);
2261
2262 if (bytes_read < 0)
2263 {
2264 if (errno == EINTR)
2265 goto again;
2266
2267 /* EAGAIN or EWOULDBLOCK would be unexpected here since we would
2268 * normally only call read_credentials if the socket was ready
2269 * for reading
2270 */
2271
2272 dbus_set_error (error, _dbus_error_from_errno (errno),
2273 "Failed to read credentials byte: %s",
2274 _dbus_strerror (errno));
2275 return FALSE;
2276 }
2277 else if (bytes_read == 0)
2278 {
2279 /* this should not happen unless we are using recvmsg wrong,
2280 * so is essentially here for paranoia
2281 */
2282 dbus_set_error (error, DBUS_ERROR_FAILED,
2283 "Failed to read credentials byte (zero-length read)");
2284 return FALSE;
2285 }
2286 else if (buf != '\0')
2287 {
2288 dbus_set_error (error, DBUS_ERROR_FAILED,
2289 "Credentials byte was not nul");
2290 return FALSE;
2291 }
2292
2293 _dbus_verbose ("read credentials byte\n");
2294
2295 {
2296#ifdef SO_PEERCRED
2297 /* Supported by at least Linux and OpenBSD, with minor differences.
2298 *
2299 * This mechanism passes the process ID through and does not require
2300 * the peer's cooperation, so we prefer it over all others. Notably,
2301 * Linux also supports SCM_CREDENTIALS, which is similar to FreeBSD
2302 * SCM_CREDS; it's implemented in GIO, but we don't use it in dbus at all,
2303 * because this is much less fragile.
2304 */
2305#ifdef __OpenBSD__
2306 struct sockpeercred cr;
2307#else
2308 struct ucred cr;
2309#endif
2310 socklen_t cr_len = sizeof (cr);
2311
2312 if (getsockopt (client_fd.fd, SOL_SOCKET, SO_PEERCRED, &cr, &cr_len) != 0)
2313 {
2314 _dbus_verbose ("Failed to getsockopt(SO_PEERCRED): %s\n",
2315 _dbus_strerror (errno));
2316 }
2317 else if (cr_len != sizeof (cr))
2318 {
2319 _dbus_verbose ("Failed to getsockopt(SO_PEERCRED), returned %d bytes, expected %d\n",
2320 cr_len, (int) sizeof (cr));
2321 }
2322 else
2323 {
2324 if (cr.pid != 0)
2325 pid_read = cr.pid;
2326
2327 if (cr.uid != (uid_t)-1)
2328 uid_read = cr.uid;
2329#ifdef __linux__
2330 /* Do other platforms have cr.gid? (Not that it really matters,
2331 * because the gid is useless to us unless we know the complete
2332 * group vector, which we only know on Linux.) */
2333 if (cr.gid != (gid_t)-1)
2334 primary_gid_read = cr.gid;
2335#endif
2336 }
2337
2338#ifdef SO_PEERPIDFD
2339 /* If we have SO_PEERCRED we might also have SO_PEERPIDFD, which
2340 * allows to pin the process ID, and is available on Linux since v6.5. */
2341 cr_len = sizeof (int);
2342
2343 if (getsockopt (client_fd.fd, SOL_SOCKET, SO_PEERPIDFD, &pid_fd_read, &cr_len) != 0)
2344 {
2345 _dbus_verbose ("Failed to getsockopt(SO_PEERPIDFD): %s\n",
2346 _dbus_strerror (errno));
2347 }
2348 else if (cr_len != sizeof (int))
2349 {
2350 _dbus_verbose ("Failed to getsockopt(SO_PEERPIDFD), returned %d bytes, expected %d\n",
2351 cr_len, (int) sizeof (int));
2352 }
2353#endif
2354
2355#elif defined(HAVE_UNPCBID) && defined(LOCAL_PEEREID)
2356 /* Another variant of the above - used on NetBSD
2357 */
2358 struct unpcbid cr;
2359 socklen_t cr_len = sizeof (cr);
2360
2361 if (getsockopt (client_fd.fd, 0, LOCAL_PEEREID, &cr, &cr_len) != 0)
2362 {
2363 _dbus_verbose ("Failed to getsockopt(LOCAL_PEEREID): %s\n",
2364 _dbus_strerror (errno));
2365 }
2366 else if (cr_len != sizeof (cr))
2367 {
2368 _dbus_verbose ("Failed to getsockopt(LOCAL_PEEREID), returned %d bytes, expected %d\n",
2369 cr_len, (int) sizeof (cr));
2370 }
2371 else
2372 {
2373 pid_read = cr.unp_pid;
2374 uid_read = cr.unp_euid;
2375 }
2376#elif defined(HAVE_CMSGCRED)
2377 /* We only check for HAVE_CMSGCRED, but we're really assuming that the
2378 * presence of that struct implies SCM_CREDS. Supported by at least
2379 * FreeBSD and DragonflyBSD.
2380 *
2381 * This mechanism requires the peer to help us (it has to send us a
2382 * SCM_CREDS message) but it does pass the process ID through,
2383 * which makes it better than getpeereid().
2384 */
2385 struct cmsgcred *cred;
2386 struct cmsghdr *cmsgp;
2387
2388 for (cmsgp = CMSG_FIRSTHDR (&msg);
2389 cmsgp != NULL;
2390 cmsgp = CMSG_NXTHDR (&msg, cmsgp))
2391 {
2392 if (cmsgp->cmsg_type == SCM_CREDS &&
2393 cmsgp->cmsg_level == SOL_SOCKET &&
2394 cmsgp->cmsg_len >= CMSG_LEN (sizeof (struct cmsgcred)))
2395 {
2396 cred = (struct cmsgcred *) (void *) CMSG_DATA (cmsgp);
2397 pid_read = cred->cmcred_pid;
2398 uid_read = cred->cmcred_euid;
2399 break;
2400 }
2401 }
2402
2403#elif defined(HAVE_GETPEERUCRED)
2404 /* Supported in at least Solaris >= 10. It should probably be higher
2405 * up this list, because it carries the pid and we use this code path
2406 * for audit data. */
2407 ucred_t * ucred = NULL;
2408 if (getpeerucred (client_fd.fd, &ucred) == 0)
2409 {
2410#ifdef HAVE_ADT
2411 adt_session_data_t *adth = NULL;
2412#endif
2413 pid_read = ucred_getpid (ucred);
2414 uid_read = ucred_geteuid (ucred);
2415#ifdef HAVE_ADT
2416 /* generate audit session data based on socket ucred */
2417 if (adt_start_session (&adth, NULL, 0) || (adth == NULL))
2418 {
2419 _dbus_verbose ("Failed to adt_start_session(): %s\n", _dbus_strerror (errno));
2420 }
2421 else
2422 {
2423 if (adt_set_from_ucred (adth, ucred, ADT_NEW))
2424 {
2425 _dbus_verbose ("Failed to adt_set_from_ucred(): %s\n", _dbus_strerror (errno));
2426 }
2427 else
2428 {
2429 adt_export_data_t *data = NULL;
2430 size_t size = adt_export_session_data (adth, &data);
2431 if (size <= 0)
2432 {
2433 _dbus_verbose ("Failed to adt_export_session_data(): %s\n", _dbus_strerror (errno));
2434 }
2435 else
2436 {
2437 _dbus_credentials_add_adt_audit_data (credentials, data, size);
2438 free (data);
2439 }
2440 }
2441 (void) adt_end_session (adth);
2442 }
2443#endif /* HAVE_ADT */
2444 }
2445 else
2446 {
2447 _dbus_verbose ("Failed to getpeerucred() credentials: %s\n", _dbus_strerror (errno));
2448 }
2449 if (ucred != NULL)
2450 ucred_free (ucred);
2451
2452 /* ----------------------------------------------------------------
2453 * When adding new mechanisms, please add them above this point
2454 * if they support passing the process ID through, or below if not.
2455 * ---------------------------------------------------------------- */
2456
2457#elif defined(HAVE_GETPEEREID)
2458 /* getpeereid() originates from D.J. Bernstein and is fairly
2459 * widely-supported. According to a web search, it might be present in
2460 * any/all of:
2461 *
2462 * - AIX?
2463 * - Blackberry?
2464 * - Cygwin
2465 * - FreeBSD 4.6+ (but we prefer SCM_CREDS: it carries the pid)
2466 * - Mac OS X
2467 * - Minix 3.1.8+
2468 * - MirBSD?
2469 * - NetBSD 5.0+ (but LOCAL_PEEREID would be better: it carries the pid)
2470 * - OpenBSD 3.0+ (but we prefer SO_PEERCRED: it carries the pid)
2471 * - QNX?
2472 */
2473 uid_t euid;
2474 gid_t egid;
2475 if (getpeereid (client_fd.fd, &euid, &egid) == 0)
2476 {
2477 uid_read = euid;
2478 }
2479 else
2480 {
2481 _dbus_verbose ("Failed to getpeereid() credentials: %s\n", _dbus_strerror (errno));
2482 }
2483#else /* no supported mechanism */
2484
2485#warning Socket credentials not supported on this Unix OS
2486#warning Please tell https://gitlab.freedesktop.org/dbus/dbus/-/issues/new
2487
2488 /* Please add other operating systems known to support at least one of
2489 * the mechanisms above to this list, keeping alphabetical order.
2490 * Everything not in this list is best-effort.
2491 */
2492#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
2493 defined(__linux__) || \
2494 defined(__OpenBSD__) || \
2495 defined(__NetBSD__)
2496# error Credentials passing not working on this OS is a regression!
2497#endif
2498
2499 _dbus_verbose ("Socket credentials not supported on this OS\n");
2500#endif
2501 }
2502
2503 _dbus_verbose ("Credentials:"
2504 " pid "DBUS_PID_FORMAT
2505 " uid "DBUS_UID_FORMAT
2506 "\n",
2507 pid_read,
2508 uid_read);
2509
2510 /* Assign this first, so we don't have to close it manually in case one of
2511 * the next steps fails. */
2512 if (pid_fd_read >= 0)
2513 _dbus_credentials_take_pid_fd (credentials, pid_fd_read);
2514
2515 if (pid_read != DBUS_PID_UNSET)
2516 {
2517 if (!_dbus_credentials_add_pid (credentials, pid_read))
2518 {
2519 _DBUS_SET_OOM (error);
2520 return FALSE;
2521 }
2522 }
2523
2524 if (uid_read != DBUS_UID_UNSET)
2525 {
2526 if (!_dbus_credentials_add_unix_uid (credentials, uid_read))
2527 {
2528 _DBUS_SET_OOM (error);
2529 return FALSE;
2530 }
2531 }
2532
2533 if (!add_linux_security_label_to_credentials (client_fd.fd, credentials))
2534 {
2535 _DBUS_SET_OOM (error);
2536 return FALSE;
2537 }
2538
2539 /* We don't put any groups in the credentials unless we can put them
2540 * all there. */
2541 if (!add_groups_to_credentials (client_fd.fd, credentials, primary_gid_read))
2542 {
2543 _DBUS_SET_OOM (error);
2544 return FALSE;
2545 }
2546
2547 return TRUE;
2548}
2549
2567 dbus_bool_t
2568_dbus_send_credentials_socket (DBusSocket server_fd,
2569 DBusError *error)
2570{
2571 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2572
2573 if (write_credentials_byte (server_fd.fd, error))
2574 return TRUE;
2575 else
2576 return FALSE;
2577}
2578
2588 DBusSocket
2589_dbus_accept (DBusSocket listen_fd)
2590{
2591 DBusSocket client_fd;
2592 struct sockaddr addr;
2593 socklen_t addrlen;
2594#ifdef HAVE_ACCEPT4
2595 dbus_bool_t cloexec_done;
2596#endif
2597
2598 addrlen = sizeof (addr);
2599
2600 retry:
2601
2602#ifdef HAVE_ACCEPT4
2603 /*
2604 * At compile-time, we assume that if accept4() is available in
2605 * libc headers, SOCK_CLOEXEC is too. At runtime, it is still
2606 * not necessarily true that either is supported by the running kernel.
2607 */
2608 client_fd.fd = accept4 (listen_fd.fd, &addr, &addrlen, SOCK_CLOEXEC);
2609 cloexec_done = client_fd.fd >= 0;
2610
2611 if (client_fd.fd < 0 && (errno == ENOSYS || errno == EINVAL))
2612#endif
2613 {
2614 client_fd.fd = accept (listen_fd.fd, &addr, &addrlen);
2615 }
2616
2617 if (client_fd.fd < 0)
2618 {
2619 if (errno == EINTR)
2620 goto retry;
2621 }
2622
2623 _dbus_verbose ("client fd %d accepted\n", client_fd.fd);
2624
2625#ifdef HAVE_ACCEPT4
2626 if (!cloexec_done)
2627#endif
2628 {
2629 _dbus_fd_set_close_on_exec(client_fd.fd);
2630 }
2631
2632 return client_fd;
2633}
2634
2643 dbus_bool_t
2644_dbus_check_dir_is_private_to_user (DBusString *dir, DBusError *error)
2645{
2646 const char *directory;
2647 struct stat sb;
2648
2649 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2650
2651 directory = _dbus_string_get_const_data (dir);
2652
2653 if (stat (directory, &sb) < 0)
2654 {
2655 dbus_set_error (error, _dbus_error_from_errno (errno),
2656 "%s", _dbus_strerror (errno));
2657
2658 return FALSE;
2659 }
2660
2661 if (sb.st_uid != geteuid ())
2662 {
2663 dbus_set_error (error, DBUS_ERROR_FAILED,
2664 "%s directory is owned by user %lu, not %lu",
2665 directory,
2666 (unsigned long) sb.st_uid,
2667 (unsigned long) geteuid ());
2668 return FALSE;
2669 }
2670
2671 if ((S_IROTH & sb.st_mode) || (S_IWOTH & sb.st_mode) ||
2672 (S_IRGRP & sb.st_mode) || (S_IWGRP & sb.st_mode))
2673 {
2674 dbus_set_error (error, DBUS_ERROR_FAILED,
2675 "%s directory is not private to the user", directory);
2676 return FALSE;
2677 }
2678
2679 return TRUE;
2680}
2681
2682static dbus_bool_t
2683fill_user_info_from_passwd (struct passwd *p,
2684 DBusUserInfo *info,
2685 DBusError *error)
2686{
2687 _dbus_assert (p->pw_name != NULL);
2688 _dbus_assert (p->pw_dir != NULL);
2689
2690 info->uid = p->pw_uid;
2691 info->primary_gid = p->pw_gid;
2692 info->username = _dbus_strdup (p->pw_name);
2693 info->homedir = _dbus_strdup (p->pw_dir);
2694
2695 if (info->username == NULL ||
2696 info->homedir == NULL)
2697 {
2698 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2699 return FALSE;
2700 }
2701
2702 return TRUE;
2703}
2704
2705static dbus_bool_t
2706fill_user_info (DBusUserInfo *info,
2707 dbus_uid_t uid,
2708 const DBusString *username,
2709 DBusError *error)
2710{
2711 const char *username_c;
2712
2713 /* exactly one of username/uid provided */
2714 _dbus_assert (username != NULL || uid != DBUS_UID_UNSET);
2715 _dbus_assert (username == NULL || uid == DBUS_UID_UNSET);
2716
2717 info->uid = DBUS_UID_UNSET;
2718 info->primary_gid = DBUS_GID_UNSET;
2719 info->group_ids = NULL;
2720 info->n_group_ids = 0;
2721 info->username = NULL;
2722 info->homedir = NULL;
2723
2724 if (username != NULL)
2725 username_c = _dbus_string_get_const_data (username);
2726 else
2727 username_c = NULL;
2728
2729 /* For now assuming that the getpwnam() and getpwuid() flavors
2730 * are always symmetrical, if not we have to add more configure
2731 * checks
2732 */
2733
2734 {
2735 struct passwd *p;
2736 char *buf = NULL;
2737 int result;
2738#ifdef HAVE_GETPWNAM_R
2739 size_t buflen;
2740 struct passwd p_str;
2741
2742 /* retrieve maximum needed size for buf */
2743 buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
2744
2745 /* sysconf actually returns a long, but everything else expects size_t,
2746 * so just recast here.
2747 * https://bugs.freedesktop.org/show_bug.cgi?id=17061
2748 */
2749 if ((long) buflen <= 0)
2750 buflen = 1024;
2751
2752 result = -1;
2753 while (1)
2754 {
2755 buf = dbus_malloc (buflen);
2756 if (buf == NULL)
2757 {
2758 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2759 return FALSE;
2760 }
2761
2762 p = NULL;
2763 if (uid != DBUS_UID_UNSET)
2764 result = getpwuid_r (uid, &p_str, buf, buflen,
2765 &p);
2766 else
2767 result = getpwnam_r (username_c, &p_str, buf, buflen,
2768 &p);
2769 //Try a bigger buffer if ERANGE was returned
2770 if (result == ERANGE && buflen < 512 * 1024)
2771 {
2772 dbus_free (buf);
2773 buflen *= 2;
2774 }
2775 else
2776 {
2777 break;
2778 }
2779 }
2780
2781 /* There are three possibilities:
2782 * - an error: result is a nonzero error code, p should be NULL
2783 * - name or uid not found: result is 0, p is NULL
2784 * - success: result is 0, p should be &p_str
2785 *
2786 * Ensure that in all failure cases, p is set to NULL, matching the
2787 * getpwuid/getpwnam interface. */
2788 if (result != 0 || p != &p_str)
2789 p = NULL;
2790
2791#else /* ! HAVE_GETPWNAM_R */
2792 /* I guess we're screwed on thread safety here */
2793#warning getpwnam_r() not available, please report this to the dbus maintainers with details of your OS
2794
2795 /* It is unspecified whether "failed to find" counts as an error,
2796 * or whether it's reported as p == NULL without touching errno.
2797 * Reset errno so we can distinguish. */
2798 errno = 0;
2799
2800 if (uid != DBUS_UID_UNSET)
2801 p = getpwuid (uid);
2802 else
2803 p = getpwnam (username_c);
2804
2805 /* Always initialized, but only meaningful if p is NULL */
2806 result = errno;
2807#endif /* ! HAVE_GETPWNAM_R */
2808
2809 if (p != NULL)
2810 {
2811 if (!fill_user_info_from_passwd (p, info, error))
2812 {
2813 dbus_free (buf);
2814 return FALSE;
2815 }
2816 dbus_free (buf);
2817 }
2818 else
2819 {
2820 DBusError local_error = DBUS_ERROR_INIT;
2821 const char *error_str;
2822
2823 if (result == 0)
2824 error_str = "not found";
2825 else
2826 error_str = _dbus_strerror (result);
2827
2828 if (uid != DBUS_UID_UNSET)
2829 dbus_set_error (&local_error, _dbus_error_from_errno (result),
2830 "Looking up user ID " DBUS_UID_FORMAT ": %s",
2831 uid, error_str);
2832 else
2833 dbus_set_error (&local_error, _dbus_error_from_errno (result),
2834 "Looking up user \"%s\": %s",
2835 username_c ? username_c : "???", error_str);
2836
2837 _dbus_verbose ("%s", local_error.message);
2838 dbus_move_error (&local_error, error);
2839 dbus_free (buf);
2840 return FALSE;
2841 }
2842 }
2843
2844 /* Fill this in so we can use it to get groups */
2845 username_c = info->username;
2846
2847#ifdef HAVE_GETGROUPLIST
2848 {
2849 gid_t *buf;
2850 int buf_count;
2851 int i;
2852 int initial_buf_count;
2853
2854 initial_buf_count = 17;
2855 buf_count = initial_buf_count;
2856 buf = dbus_new (gid_t, buf_count);
2857 if (buf == NULL)
2858 {
2859 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2860 goto failed;
2861 }
2862
2863 if (getgrouplist (username_c,
2864 info->primary_gid,
2865 buf, &buf_count) < 0)
2866 {
2867 gid_t *new;
2868 /* Presumed cause of negative return code: buf has insufficient
2869 entries to hold the entire group list. The Linux behavior in this
2870 case is to pass back the actual number of groups in buf_count, but
2871 on Mac OS X 10.5, buf_count is unhelpfully left alone.
2872 So as a hack, try to help out a bit by guessing a larger
2873 number of groups, within reason.. might still fail, of course,
2874 but we can at least print a more informative message. I looked up
2875 the "right way" to do this by downloading Apple's own source code
2876 for the "id" command, and it turns out that they use an
2877 undocumented library function getgrouplist_2 (!) which is not
2878 declared in any header in /usr/include (!!). That did not seem
2879 like the way to go here.
2880 */
2881 if (buf_count == initial_buf_count)
2882 {
2883 buf_count *= 16; /* Retry with an arbitrarily scaled-up array */
2884 }
2885 new = dbus_realloc (buf, buf_count * sizeof (buf[0]));
2886 if (new == NULL)
2887 {
2888 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2889 dbus_free (buf);
2890 goto failed;
2891 }
2892
2893 buf = new;
2894
2895 errno = 0;
2896 if (getgrouplist (username_c, info->primary_gid, buf, &buf_count) < 0)
2897 {
2898 if (errno == 0)
2899 {
2900 _dbus_warn ("It appears that username \"%s\" is in more than %d groups.\nProceeding with just the first %d groups.",
2901 username_c, buf_count, buf_count);
2902 }
2903 else
2904 {
2905 dbus_set_error (error,
2906 _dbus_error_from_errno (errno),
2907 "Failed to get groups for username \"%s\" primary GID "
2908 DBUS_GID_FORMAT ": %s\n",
2909 username_c, info->primary_gid,
2910 _dbus_strerror (errno));
2911 dbus_free (buf);
2912 goto failed;
2913 }
2914 }
2915 }
2916
2917 info->group_ids = dbus_new (dbus_gid_t, buf_count);
2918 if (info->group_ids == NULL)
2919 {
2920 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2921 dbus_free (buf);
2922 goto failed;
2923 }
2924
2925 for (i = 0; i < buf_count; ++i)
2926 info->group_ids[i] = buf[i];
2927
2928 info->n_group_ids = buf_count;
2929
2930 dbus_free (buf);
2931 }
2932#else /* HAVE_GETGROUPLIST */
2933 {
2934 /* We just get the one group ID */
2935 info->group_ids = dbus_new (dbus_gid_t, 1);
2936 if (info->group_ids == NULL)
2937 {
2938 dbus_set_error (error, DBUS_ERROR_NO_MEMORY, NULL);
2939 goto failed;
2940 }
2941
2942 info->n_group_ids = 1;
2943
2944 (info->group_ids)[0] = info->primary_gid;
2945 }
2946#endif /* HAVE_GETGROUPLIST */
2947
2948 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
2949
2950 return TRUE;
2951
2952 failed:
2953 _DBUS_ASSERT_ERROR_IS_SET (error);
2954 return FALSE;
2955}
2956
2965 dbus_bool_t
2966_dbus_user_info_fill (DBusUserInfo *info,
2967 const DBusString *username,
2968 DBusError *error)
2969{
2970 return fill_user_info (info, DBUS_UID_UNSET,
2971 username, error);
2972}
2973
2982 dbus_bool_t
2983_dbus_user_info_fill_uid (DBusUserInfo *info,
2984 dbus_uid_t uid,
2985 DBusError *error)
2986{
2987 return fill_user_info (info, uid,
2988 NULL, error);
2989}
2990
3004 dbus_bool_t
3005_dbus_credentials_add_from_current_process (DBusCredentials *credentials)
3006{
3007 dbus_pid_t pid = _dbus_getpid ();
3008
3009 /* The POSIX spec certainly doesn't promise this, but
3010 * we need these assertions to fail as soon as we're wrong about
3011 * it so we can do the porting fixups
3012 */
3013 _DBUS_STATIC_ASSERT (sizeof (pid_t) <= sizeof (dbus_pid_t));
3014 _DBUS_STATIC_ASSERT (sizeof (uid_t) <= sizeof (dbus_uid_t));
3015 _DBUS_STATIC_ASSERT (sizeof (gid_t) <= sizeof (dbus_gid_t));
3016
3017#if HAVE_DECL_SYS_PIDFD_OPEN
3018 /* Normally this syscall would have a race condition, but we can trust
3019 * that our own process isn't going to exit, so the pid won't get reused. */
3020 int pid_fd = (int) syscall (SYS_pidfd_open, pid, 0);
3021 if (pid_fd >= 0)
3022 _dbus_credentials_take_pid_fd (credentials, pid_fd);
3023#endif
3024 if (!_dbus_credentials_add_pid (credentials, pid))
3025 return FALSE;
3026 if (!_dbus_credentials_add_unix_uid(credentials, _dbus_geteuid()))
3027 return FALSE;
3028
3029 return TRUE;
3030}
3031
3044 dbus_pid_t
3045_dbus_resolve_pid_fd (int pid_fd)
3046{
3047#ifdef __linux__
3048 DBusError error = DBUS_ERROR_INIT;
3049 DBusString content = _DBUS_STRING_INIT_INVALID;
3050 DBusString filename = _DBUS_STRING_INIT_INVALID;
3051 dbus_pid_t result = DBUS_PID_UNSET;
3052 int pid_index;
3053
3054 if (pid_fd < 0)
3055 goto out;
3056
3057 if (!_dbus_string_init (&content))
3058 goto out;
3059
3060 if (!_dbus_string_init (&filename))
3061 goto out;
3062
3063 if (!_dbus_string_append_printf (&filename, "/proc/self/fdinfo/%d", pid_fd))
3064 goto out;
3065
3066 if (!_dbus_file_get_contents (&content, &filename, &error))
3067 {
3068 _dbus_verbose ("Cannot read '/proc/self/fdinfo/%d', unable to resolve PID, %s: %s\n",
3069 pid_fd, error.name, error.message);
3070 goto out;
3071 }
3072
3073 /* Ensure we are not reading PPid, either it's the first line of the file or
3074 * there's a newline before it. */
3075 if (!_dbus_string_find (&content, 0, "Pid:", &pid_index) ||
3076 (pid_index > 0 && _dbus_string_get_byte (&content, pid_index - 1) != '\n'))
3077 {
3078 _dbus_verbose ("Cannot find 'Pid:' in '/proc/self/fdinfo/%d', unable to resolve PID\n",
3079 pid_fd);
3080 goto out;
3081 }
3082
3083 if (!_dbus_string_parse_uint (&content, pid_index + strlen ("Pid:"), &result, NULL))
3084 {
3085 _dbus_verbose ("Cannot parse 'Pid:' from '/proc/self/fdinfo/%d', unable to resolve PID\n",
3086 pid_fd);
3087 goto out;
3088 }
3089
3090out:
3091 _dbus_string_free (&content);
3092 _dbus_string_free (&filename);
3093 dbus_error_free (&error);
3094
3095 if (result <= 0)
3096 return DBUS_PID_UNSET;
3097
3098 return result;
3099#else
3100 return DBUS_PID_UNSET;
3101#endif
3102
3103}
3104
3116 dbus_bool_t
3117_dbus_append_user_from_current_process (DBusString *str)
3118{
3119 return _dbus_string_append_printf (str, DBUS_UID_FORMAT, _dbus_geteuid ());
3120}
3121
3126 dbus_pid_t
3127_dbus_getpid (void)
3128{
3129 return getpid ();
3130}
3131
3135 dbus_uid_t
3136_dbus_getuid (void)
3137{
3138 return getuid ();
3139}
3140
3144 dbus_uid_t
3145_dbus_geteuid (void)
3146{
3147 return geteuid ();
3148}
3149
3156unsigned long
3157_dbus_pid_for_log (void)
3158{
3159 return getpid ();
3160}
3161
3162#if !defined(HAVE_STDATOMIC_H) && !DBUS_USE_SYNC
3163/* To be thread-safe by default on platforms that don't necessarily have
3164 * atomic operations (notably Debian armel, which is armv4t), we must
3165 * use a mutex that can be initialized statically, like this.
3166 * GLib >= 2.32 uses a similar system.
3167 */
3168static pthread_mutex_t atomic_mutex = PTHREAD_MUTEX_INITIALIZER;
3169#endif
3170
3177 dbus_int32_t
3178_dbus_atomic_inc (DBusAtomic *atomic)
3179{
3180#ifdef HAVE_STDATOMIC_H
3181 /* Atomic version of "old = *atomic; *atomic += 1; return old" */
3182 return atomic_fetch_add (&atomic->value, 1);
3183#elif DBUS_USE_SYNC
3184 /* Atomic version of "*atomic += 1; return *atomic - 1" */
3185 return __sync_add_and_fetch(&atomic->value, 1)-1;
3186#else
3187 dbus_int32_t res;
3188
3189 pthread_mutex_lock (&atomic_mutex);
3190 res = atomic->value;
3191 atomic->value += 1;
3192 pthread_mutex_unlock (&atomic_mutex);
3193
3194 return res;
3195#endif
3196}
3197
3204 dbus_int32_t
3205_dbus_atomic_dec (DBusAtomic *atomic)
3206{
3207#ifdef HAVE_STDATOMIC_H
3208 /* Atomic version of "old = *atomic; *atomic -= 1; return old" */
3209 return atomic_fetch_sub (&atomic->value, 1);
3210#elif DBUS_USE_SYNC
3211 /* Atomic version of "*atomic -= 1; return *atomic + 1" */
3212 return __sync_sub_and_fetch(&atomic->value, 1)+1;
3213#else
3214 dbus_int32_t res;
3215
3216 pthread_mutex_lock (&atomic_mutex);
3217 res = atomic->value;
3218 atomic->value -= 1;
3219 pthread_mutex_unlock (&atomic_mutex);
3220
3221 return res;
3222#endif
3223}
3224
3232 dbus_int32_t
3233_dbus_atomic_get (DBusAtomic *atomic)
3234{
3235#ifdef HAVE_STDATOMIC_H
3236 /* Atomic version of "return *atomic" */
3237 return atomic_load (&atomic->value);
3238#elif DBUS_USE_SYNC
3239 __sync_synchronize ();
3240 return atomic->value;
3241#else
3242 dbus_int32_t res;
3243
3244 pthread_mutex_lock (&atomic_mutex);
3245 res = atomic->value;
3246 pthread_mutex_unlock (&atomic_mutex);
3247
3248 return res;
3249#endif
3250}
3251
3257void
3258_dbus_atomic_set_zero (DBusAtomic *atomic)
3259{
3260#ifdef HAVE_STDATOMIC_H
3261 /* Atomic version of "*atomic = 0" */
3262 atomic_store (&atomic->value, 0);
3263#elif DBUS_USE_SYNC
3264 /* Atomic version of "*atomic &= 0; return *atomic" */
3265 __sync_and_and_fetch (&atomic->value, 0);
3266#else
3267 pthread_mutex_lock (&atomic_mutex);
3268 atomic->value = 0;
3269 pthread_mutex_unlock (&atomic_mutex);
3270#endif
3271}
3272
3278void
3279_dbus_atomic_set_nonzero (DBusAtomic *atomic)
3280{
3281#ifdef HAVE_STDATOMIC_H
3282 /* Atomic version of "*atomic = 1" */
3283 atomic_store (&atomic->value, 1);
3284#elif DBUS_USE_SYNC
3285 /* Atomic version of "*atomic |= 1; return *atomic" */
3286 __sync_or_and_fetch (&atomic->value, 1);
3287#else
3288 pthread_mutex_lock (&atomic_mutex);
3289 atomic->value = 1;
3290 pthread_mutex_unlock (&atomic_mutex);
3291#endif
3292}
3293
3302int
3303_dbus_poll (DBusPollFD *fds,
3304 int n_fds,
3305 int timeout_milliseconds)
3306{
3307#if defined(HAVE_POLL) && !defined(BROKEN_POLL)
3308 /* DBusPollFD is a struct pollfd in this code path, so we can just poll() */
3309 if (timeout_milliseconds < -1)
3310 {
3311 timeout_milliseconds = -1;
3312 }
3313
3314 return poll (fds,
3315 n_fds,
3316 timeout_milliseconds);
3317#else /* ! HAVE_POLL */
3318 /* Emulate poll() in terms of select() */
3319 fd_set read_set, write_set, err_set;
3320 int max_fd = 0;
3321 int i;
3322 struct timeval tv;
3323 int ready;
3324
3325 FD_ZERO (&read_set);
3326 FD_ZERO (&write_set);
3327 FD_ZERO (&err_set);
3328
3329 for (i = 0; i < n_fds; i++)
3330 {
3331 DBusPollFD *fdp = &fds[i];
3332
3333 if (fdp->events & _DBUS_POLLIN)
3334 FD_SET (fdp->fd, &read_set);
3335
3336 if (fdp->events & _DBUS_POLLOUT)
3337 FD_SET (fdp->fd, &write_set);
3338
3339 FD_SET (fdp->fd, &err_set);
3340
3341 max_fd = MAX (max_fd, fdp->fd);
3342 }
3343
3344 tv.tv_sec = timeout_milliseconds / 1000;
3345 tv.tv_usec = (timeout_milliseconds % 1000) * 1000;
3346
3347 ready = select (max_fd + 1, &read_set, &write_set, &err_set,
3348 timeout_milliseconds < 0 ? NULL : &tv);
3349
3350 if (ready > 0)
3351 {
3352 for (i = 0; i < n_fds; i++)
3353 {
3354 DBusPollFD *fdp = &fds[i];
3355
3356 fdp->revents = 0;
3357
3358 if (FD_ISSET (fdp->fd, &read_set))
3359 fdp->revents |= _DBUS_POLLIN;
3360
3361 if (FD_ISSET (fdp->fd, &write_set))
3362 fdp->revents |= _DBUS_POLLOUT;
3363
3364 if (FD_ISSET (fdp->fd, &err_set))
3365 fdp->revents |= _DBUS_POLLERR;
3366 }
3367 }
3368
3369 return ready;
3370#endif
3371}
3372
3380void
3381_dbus_get_monotonic_time (dbus_int64_t *tv_sec,
3382 long *tv_usec)
3383{
3384#ifdef HAVE_MONOTONIC_CLOCK
3385 struct timespec ts;
3386 clock_gettime (CLOCK_MONOTONIC, &ts);
3387
3388 if (tv_sec)
3389 *tv_sec = ts.tv_sec;
3390 if (tv_usec)
3391 *tv_usec = ts.tv_nsec / 1000;
3392#else
3393 struct timeval t;
3394
3395 gettimeofday (&t, NULL);
3396
3397 if (tv_sec)
3398 *tv_sec = t.tv_sec;
3399 if (tv_usec)
3400 *tv_usec = t.tv_usec;
3401#endif
3402}
3403
3411void
3412_dbus_get_real_time (dbus_int64_t *tv_sec,
3413 long *tv_usec)
3414{
3415 struct timeval t;
3416
3417 gettimeofday (&t, NULL);
3418
3419 if (tv_sec)
3420 *tv_sec = t.tv_sec;
3421 if (tv_usec)
3422 *tv_usec = t.tv_usec;
3423}
3424
3433 dbus_bool_t
3434_dbus_ensure_directory (const DBusString *filename,
3435 DBusError *error)
3436{
3437 const char *filename_c;
3438
3439 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3440
3441 filename_c = _dbus_string_get_const_data (filename);
3442
3443 if (mkdir (filename_c, 0700) < 0)
3444 {
3445 if (errno == EEXIST)
3446 return TRUE;
3447
3448 dbus_set_error (error, DBUS_ERROR_FAILED,
3449 "Failed to create directory %s: %s\n",
3450 filename_c, _dbus_strerror (errno));
3451 return FALSE;
3452 }
3453 else
3454 return TRUE;
3455}
3456
3465 dbus_bool_t
3466_dbus_create_directory (const DBusString *filename,
3467 DBusError *error)
3468{
3469 const char *filename_c;
3470
3471 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3472
3473 filename_c = _dbus_string_get_const_data (filename);
3474
3475 if (mkdir (filename_c, 0700) < 0)
3476 {
3477 dbus_set_error (error, DBUS_ERROR_FAILED,
3478 "Failed to create directory %s: %s\n",
3479 filename_c, _dbus_strerror (errno));
3480 return FALSE;
3481 }
3482 else
3483 return TRUE;
3484}
3485
3496 dbus_bool_t
3497_dbus_concat_dir_and_file (DBusString *dir,
3498 const DBusString *next_component)
3499{
3500 dbus_bool_t dir_ends_in_slash;
3501 dbus_bool_t file_starts_with_slash;
3502
3503 if (_dbus_string_get_length (dir) == 0 ||
3504 _dbus_string_get_length (next_component) == 0)
3505 return TRUE;
3506
3507 dir_ends_in_slash = '/' == _dbus_string_get_byte (dir,
3508 _dbus_string_get_length (dir) - 1);
3509
3510 file_starts_with_slash = '/' == _dbus_string_get_byte (next_component, 0);
3511
3512 if (dir_ends_in_slash && file_starts_with_slash)
3513 {
3514 _dbus_string_shorten (dir, 1);
3515 }
3516 else if (!(dir_ends_in_slash || file_starts_with_slash))
3517 {
3518 if (!_dbus_string_append_byte (dir, '/'))
3519 return FALSE;
3520 }
3521
3522 return _dbus_string_copy (next_component, 0, dir,
3523 _dbus_string_get_length (dir));
3524}
3525
3527#define NANOSECONDS_PER_SECOND 1000000000
3529#define MICROSECONDS_PER_SECOND 1000000
3531#define MILLISECONDS_PER_SECOND 1000
3533#define NANOSECONDS_PER_MILLISECOND 1000000
3535#define MICROSECONDS_PER_MILLISECOND 1000
3536
3541void
3542_dbus_sleep_milliseconds (int milliseconds)
3543{
3544#ifdef HAVE_NANOSLEEP
3545 struct timespec req;
3546 struct timespec rem;
3547
3548 req.tv_sec = milliseconds / MILLISECONDS_PER_SECOND;
3549 req.tv_nsec = (milliseconds % MILLISECONDS_PER_SECOND) * NANOSECONDS_PER_MILLISECOND;
3550 rem.tv_sec = 0;
3551 rem.tv_nsec = 0;
3552
3553 while (nanosleep (&req, &rem) < 0 && errno == EINTR)
3554 req = rem;
3555#elif defined (HAVE_USLEEP)
3556 usleep (milliseconds * MICROSECONDS_PER_MILLISECOND);
3557#else /* ! HAVE_USLEEP */
3558 sleep (MAX (milliseconds / 1000, 1));
3559#endif
3560}
3561
3571 dbus_bool_t
3572_dbus_generate_random_bytes (DBusString *str,
3573 int n_bytes,
3574 DBusError *error)
3575{
3576 int old_len = _dbus_string_get_length (str);
3577 int fd;
3578 int result;
3579#ifdef HAVE_GETRANDOM
3580 char *buffer;
3581
3582 if (!_dbus_string_lengthen (str, n_bytes))
3583 {
3584 _DBUS_SET_OOM (error);
3585 return FALSE;
3586 }
3587
3588 buffer = _dbus_string_get_data_len (str, old_len, n_bytes);
3589 result = getrandom (buffer, n_bytes, GRND_NONBLOCK);
3590
3591 if (result == n_bytes)
3592 return TRUE;
3593
3594 _dbus_string_set_length (str, old_len);
3595#endif
3596
3597 /* note, urandom on linux will fall back to pseudorandom */
3598 fd = open ("/dev/urandom", O_RDONLY);
3599
3600 if (fd < 0)
3601 {
3602 dbus_set_error (error, _dbus_error_from_errno (errno),
3603 "Could not open /dev/urandom: %s",
3604 _dbus_strerror (errno));
3605 return FALSE;
3606 }
3607
3608 _dbus_verbose ("/dev/urandom fd %d opened\n", fd);
3609
3610 result = _dbus_read (fd, str, n_bytes);
3611
3612 if (result != n_bytes)
3613 {
3614 if (result < 0)
3615 dbus_set_error (error, _dbus_error_from_errno (errno),
3616 "Could not read /dev/urandom: %s",
3617 _dbus_strerror (errno));
3618 else
3619 dbus_set_error (error, DBUS_ERROR_IO_ERROR,
3620 "Short read from /dev/urandom");
3621
3622 _dbus_close (fd, NULL);
3623 _dbus_string_set_length (str, old_len);
3624 return FALSE;
3625 }
3626
3627 _dbus_verbose ("Read %d bytes from /dev/urandom\n",
3628 n_bytes);
3629
3630 _dbus_close (fd, NULL);
3631
3632 return TRUE;
3633}
3634
3640void
3641_dbus_exit (int code)
3642{
3643 _exit (code);
3644}
3645
3654const char*
3655_dbus_strerror (int error_number)
3656{
3657 const char *msg;
3658
3659 msg = strerror (error_number);
3660 if (msg == NULL)
3661 msg = "unknown";
3662
3663 return msg;
3664}
3665
3669void
3670_dbus_disable_sigpipe (void)
3671{
3672 signal (SIGPIPE, SIG_IGN);
3673}
3674
3682void
3683_dbus_fd_set_close_on_exec (int fd)
3684{
3685 int val;
3686
3687 val = fcntl (fd, F_GETFD, 0);
3688
3689 if (val < 0)
3690 return;
3691
3692 val |= FD_CLOEXEC;
3693
3694 fcntl (fd, F_SETFD, val);
3695}
3696
3704void
3705_dbus_fd_clear_close_on_exec (int fd)
3706{
3707 int val;
3708
3709 val = fcntl (fd, F_GETFD, 0);
3710
3711 if (val < 0)
3712 return;
3713
3714 val &= ~FD_CLOEXEC;
3715
3716 fcntl (fd, F_SETFD, val);
3717}
3718
3726 dbus_bool_t
3727_dbus_close (int fd,
3728 DBusError *error)
3729{
3730 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3731
3732 again:
3733 if (close (fd) < 0)
3734 {
3735 if (errno == EINTR)
3736 goto again;
3737
3738 dbus_set_error (error, _dbus_error_from_errno (errno),
3739 "Could not close fd %d", fd);
3740 return FALSE;
3741 }
3742
3743 return TRUE;
3744}
3745
3754int
3755_dbus_dup(int fd,
3756 DBusError *error)
3757{
3758 int new_fd;
3759
3760#ifdef F_DUPFD_CLOEXEC
3761 dbus_bool_t cloexec_done;
3762
3763 new_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
3764 cloexec_done = new_fd >= 0;
3765
3766 if (new_fd < 0 && errno == EINVAL)
3767#endif
3768 {
3769 new_fd = fcntl(fd, F_DUPFD, 3);
3770 }
3771
3772 if (new_fd < 0) {
3773
3774 dbus_set_error (error, _dbus_error_from_errno (errno),
3775 "Could not duplicate fd %d", fd);
3776 return -1;
3777 }
3778
3779#ifdef F_DUPFD_CLOEXEC
3780 if (!cloexec_done)
3781#endif
3782 {
3783 _dbus_fd_set_close_on_exec(new_fd);
3784 }
3785
3786 return new_fd;
3787}
3788
3796 dbus_bool_t
3797_dbus_set_socket_nonblocking (DBusSocket fd,
3798 DBusError *error)
3799{
3800 return _dbus_set_fd_nonblocking (fd.fd, error);
3801}
3802
3803static dbus_bool_t
3804_dbus_set_fd_nonblocking (int fd,
3805 DBusError *error)
3806{
3807 int val;
3808
3809 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3810
3811 val = fcntl (fd, F_GETFL, 0);
3812 if (val < 0)
3813 {
3814 dbus_set_error (error, _dbus_error_from_errno (errno),
3815 "Failed to get flags from file descriptor %d: %s",
3816 fd, _dbus_strerror (errno));
3817 _dbus_verbose ("Failed to get flags for fd %d: %s\n", fd,
3818 _dbus_strerror (errno));
3819 return FALSE;
3820 }
3821
3822 if (fcntl (fd, F_SETFL, val | O_NONBLOCK) < 0)
3823 {
3824 dbus_set_error (error, _dbus_error_from_errno (errno),
3825 "Failed to set nonblocking flag of file descriptor %d: %s",
3826 fd, _dbus_strerror (errno));
3827 _dbus_verbose ("Failed to set fd %d nonblocking: %s\n",
3828 fd, _dbus_strerror (errno));
3829
3830 return FALSE;
3831 }
3832
3833 return TRUE;
3834}
3835
3841void
3842_dbus_print_backtrace (void)
3843{
3844#if defined (HAVE_BACKTRACE) && defined (DBUS_BUILT_R_DYNAMIC)
3845 void *bt[500];
3846 int bt_size;
3847 int i;
3848 char **syms;
3849
3850 bt_size = backtrace (bt, 500);
3851
3852 syms = backtrace_symbols (bt, bt_size);
3853
3854 i = 0;
3855 while (i < bt_size)
3856 {
3857 /* don't use dbus_warn since it can _dbus_abort() */
3858 fprintf (stderr, " %s\n", syms[i]);
3859 ++i;
3860 }
3861 fflush (stderr);
3862
3863 free (syms);
3864#elif defined (HAVE_BACKTRACE) && ! defined (DBUS_BUILT_R_DYNAMIC)
3865 fprintf (stderr, " D-Bus not built with -rdynamic so unable to print a backtrace\n");
3866#else
3867 fprintf (stderr, " D-Bus not compiled with backtrace support so unable to print a backtrace\n");
3868#endif
3869}
3870
3883 dbus_bool_t
3884_dbus_socketpair (DBusSocket *fd1,
3885 DBusSocket *fd2,
3886 dbus_bool_t blocking,
3887 DBusError *error)
3888{
3889#ifdef HAVE_SOCKETPAIR
3890 int fds[2];
3891 int retval;
3892
3893#ifdef SOCK_CLOEXEC
3894 dbus_bool_t cloexec_done;
3895
3896 retval = socketpair(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0, fds);
3897 cloexec_done = retval >= 0;
3898
3899 if (retval < 0 && (errno == EINVAL || errno == EPROTOTYPE))
3900#endif
3901 {
3902 retval = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
3903 }
3904
3905 if (retval < 0)
3906 {
3907 dbus_set_error (error, _dbus_error_from_errno (errno),
3908 "Could not create full-duplex pipe");
3909 return FALSE;
3910 }
3911
3912 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
3913
3914#ifdef SOCK_CLOEXEC
3915 if (!cloexec_done)
3916#endif
3917 {
3918 _dbus_fd_set_close_on_exec (fds[0]);
3919 _dbus_fd_set_close_on_exec (fds[1]);
3920 }
3921
3922 if (!blocking &&
3923 (!_dbus_set_fd_nonblocking (fds[0], NULL) ||
3924 !_dbus_set_fd_nonblocking (fds[1], NULL)))
3925 {
3926 dbus_set_error (error, _dbus_error_from_errno (errno),
3927 "Could not set full-duplex pipe nonblocking");
3928
3929 _dbus_close (fds[0], NULL);
3930 _dbus_close (fds[1], NULL);
3931
3932 return FALSE;
3933 }
3934
3935 fd1->fd = fds[0];
3936 fd2->fd = fds[1];
3937
3938 _dbus_verbose ("full-duplex pipe %d <-> %d\n",
3939 fd1->fd, fd2->fd);
3940
3941 return TRUE;
3942#else
3943 _dbus_warn ("_dbus_socketpair() not implemented on this OS");
3944 dbus_set_error (error, DBUS_ERROR_FAILED,
3945 "_dbus_socketpair() not implemented on this OS");
3946 return FALSE;
3947#endif
3948}
3949
3958int
3959_dbus_printf_string_upper_bound (const char *format,
3960 va_list args)
3961{
3962 char static_buf[1024];
3963 int bufsize = sizeof (static_buf);
3964 int len;
3965 va_list args_copy;
3966
3967 va_copy (args_copy, args);
3968 len = vsnprintf (static_buf, bufsize, format, args_copy);
3969 va_end (args_copy);
3970
3971 /* If vsnprintf() returned non-negative, then either the string fits in
3972 * static_buf, or this OS has the POSIX and C99 behaviour where vsnprintf
3973 * returns the number of characters that were needed, or this OS returns the
3974 * truncated length.
3975 *
3976 * We ignore the possibility that snprintf might just ignore the length and
3977 * overrun the buffer (64-bit Solaris 7), because that's pathological.
3978 * If your libc is really that bad, come back when you have a better one. */
3979 if (len == bufsize)
3980 {
3981 /* This could be the truncated length (Tru64 and IRIX have this bug),
3982 * or the real length could be coincidentally the same. Which is it?
3983 * If vsnprintf returns the truncated length, we'll go to the slow
3984 * path. */
3985 va_copy (args_copy, args);
3986
3987 if (vsnprintf (static_buf, 1, format, args_copy) == 1)
3988 len = -1;
3989
3990 va_end (args_copy);
3991 }
3992
3993 /* If vsnprintf() returned negative, we have to do more work.
3994 * HP-UX returns negative. */
3995 while (len < 0)
3996 {
3997 char *buf;
3998
3999 bufsize *= 2;
4000
4001 buf = dbus_malloc (bufsize);
4002
4003 if (buf == NULL)
4004 return -1;
4005
4006 va_copy (args_copy, args);
4007 len = vsnprintf (buf, bufsize, format, args_copy);
4008 va_end (args_copy);
4009
4010 dbus_free (buf);
4011
4012 /* If the reported length is exactly the buffer size, round up to the
4013 * next size, in case vsnprintf has been returning the truncated
4014 * length */
4015 if (len == bufsize)
4016 len = -1;
4017 }
4018
4019 return len;
4020}
4021
4028const char*
4029_dbus_get_tmpdir(void)
4030{
4031 /* Protected by _DBUS_LOCK_sysdeps */
4032 static const char* tmpdir = NULL;
4033
4034 if (!_DBUS_LOCK (sysdeps))
4035 return NULL;
4036
4037 if (tmpdir == NULL)
4038 {
4039 /* TMPDIR is what glibc uses, then
4040 * glibc falls back to the P_tmpdir macro which
4041 * just expands to "/tmp"
4042 */
4043 if (tmpdir == NULL)
4044 tmpdir = getenv("TMPDIR");
4045
4046 /* These two env variables are probably
4047 * broken, but maybe some OS uses them?
4048 */
4049 if (tmpdir == NULL)
4050 tmpdir = getenv("TMP");
4051 if (tmpdir == NULL)
4052 tmpdir = getenv("TEMP");
4053
4054 /* And this is the sane fallback. */
4055 if (tmpdir == NULL)
4056 tmpdir = "/tmp";
4057 }
4058
4059 _DBUS_UNLOCK (sysdeps);
4060
4061 _dbus_assert(tmpdir != NULL);
4062
4063 return tmpdir;
4064}
4065
4066#if defined(DBUS_ENABLE_X11_AUTOLAUNCH) || defined(DBUS_ENABLE_LAUNCHD)
4086static dbus_bool_t
4087_read_subprocess_line_argv (const char *progpath,
4088 dbus_bool_t path_fallback,
4089 const char * const *argv,
4090 DBusString *result,
4091 DBusError *error)
4092{
4093 int result_pipe[2] = { -1, -1 };
4094 int errors_pipe[2] = { -1, -1 };
4095 pid_t pid;
4096 int ret;
4097 int status;
4098 int orig_len;
4099
4100 dbus_bool_t retval;
4101 sigset_t new_set, old_set;
4102
4103 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
4104 retval = FALSE;
4105
4106 /* We need to block any existing handlers for SIGCHLD temporarily; they
4107 * will cause waitpid() below to fail.
4108 * https://bugs.freedesktop.org/show_bug.cgi?id=21347
4109 */
4110 sigemptyset (&new_set);
4111 sigaddset (&new_set, SIGCHLD);
4112 sigprocmask (SIG_BLOCK, &new_set, &old_set);
4113
4114 orig_len = _dbus_string_get_length (result);
4115
4116#define READ_END 0
4117#define WRITE_END 1
4118 if (pipe (result_pipe) < 0)
4119 {
4120 dbus_set_error (error, _dbus_error_from_errno (errno),
4121 "Failed to create a pipe to call %s: %s",
4122 progpath, _dbus_strerror (errno));
4123 _dbus_verbose ("Failed to create a pipe to call %s: %s\n",
4124 progpath, _dbus_strerror (errno));
4125 goto out;
4126 }
4127 if (pipe (errors_pipe) < 0)
4128 {
4129 dbus_set_error (error, _dbus_error_from_errno (errno),
4130 "Failed to create a pipe to call %s: %s",
4131 progpath, _dbus_strerror (errno));
4132 _dbus_verbose ("Failed to create a pipe to call %s: %s\n",
4133 progpath, _dbus_strerror (errno));
4134 goto out;
4135 }
4136
4137 /* Make sure our output buffers aren't redundantly printed by both the
4138 * parent and the child */
4139 fflush (stdout);
4140 fflush (stderr);
4141
4142 pid = fork ();
4143 if (pid < 0)
4144 {
4145 dbus_set_error (error, _dbus_error_from_errno (errno),
4146 "Failed to fork() to call %s: %s",
4147 progpath, _dbus_strerror (errno));
4148 _dbus_verbose ("Failed to fork() to call %s: %s\n",
4149 progpath, _dbus_strerror (errno));
4150 goto out;
4151 }
4152
4153 if (pid == 0)
4154 {
4155 /* child process */
4156 const char *error_str;
4157
4158 if (!_dbus_ensure_standard_fds (DBUS_FORCE_STDIN_NULL, &error_str))
4159 {
4160 int saved_errno = errno;
4161
4162 /* Try to write details into the pipe, but don't bother
4163 * trying too hard (no retry loop). */
4164
4165 if (write (errors_pipe[WRITE_END], error_str, strlen (error_str)) < 0 ||
4166 write (errors_pipe[WRITE_END], ": ", 2) < 0)
4167 {
4168 /* ignore, not much we can do */
4169 }
4170
4171 error_str = _dbus_strerror (saved_errno);
4172
4173 if (write (errors_pipe[WRITE_END], error_str, strlen (error_str)) < 0)
4174 {
4175 /* ignore, not much we can do */
4176 }
4177
4178 _exit (1);
4179 }
4180
4181 /* set-up stdXXX */
4182 close (result_pipe[READ_END]);
4183 close (errors_pipe[READ_END]);
4184
4185 if (dup2 (result_pipe[WRITE_END], 1) == -1) /* setup stdout */
4186 _exit (1);
4187 if (dup2 (errors_pipe[WRITE_END], 2) == -1) /* setup stderr */
4188 _exit (1);
4189
4190 _dbus_close_all ();
4191
4192 sigprocmask (SIG_SETMASK, &old_set, NULL);
4193
4194 /* If it looks fully-qualified, try execv first */
4195 if (progpath[0] == '/')
4196 {
4197 execv (progpath, (char * const *) argv);
4198 /* Ok, that failed. Now if path_fallback is given, let's
4199 * try unqualified. This is mostly a hack to work
4200 * around systems which ship dbus-launch in /usr/bin
4201 * but everything else in /bin (because dbus-launch
4202 * depends on X11).
4203 */
4204 if (path_fallback)
4205 /* We must have a slash, because we checked above */
4206 execvp (strrchr (progpath, '/')+1, (char * const *) argv);
4207 }
4208 else
4209 execvp (progpath, (char * const *) argv);
4210
4211 /* still nothing, we failed */
4212 _exit (1);
4213 }
4214
4215 /* parent process */
4216 close (result_pipe[WRITE_END]);
4217 close (errors_pipe[WRITE_END]);
4218 result_pipe[WRITE_END] = -1;
4219 errors_pipe[WRITE_END] = -1;
4220
4221 ret = 0;
4222 do
4223 {
4224 ret = _dbus_read (result_pipe[READ_END], result, 1024);
4225 }
4226 while (ret > 0);
4227
4228 /* reap the child process to avoid it lingering as zombie */
4229 do
4230 {
4231 ret = waitpid (pid, &status, 0);
4232 }
4233 while (ret == -1 && errno == EINTR);
4234
4235 /* We succeeded if the process exited with status 0 and
4236 anything was read */
4237 if (!WIFEXITED (status) || WEXITSTATUS (status) != 0 )
4238 {
4239 /* The process ended with error */
4240 DBusString error_message;
4241 if (!_dbus_string_init (&error_message))
4242 {
4243 _DBUS_SET_OOM (error);
4244 goto out;
4245 }
4246
4247 ret = 0;
4248 do
4249 {
4250 ret = _dbus_read (errors_pipe[READ_END], &error_message, 1024);
4251 }
4252 while (ret > 0);
4253
4254 _dbus_string_set_length (result, orig_len);
4255 if (_dbus_string_get_length (&error_message) > 0)
4256 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
4257 "%s terminated abnormally with the following error: %s",
4258 progpath, _dbus_string_get_data (&error_message));
4259 else
4260 dbus_set_error (error, DBUS_ERROR_SPAWN_EXEC_FAILED,
4261 "%s terminated abnormally without any error message",
4262 progpath);
4263 goto out;
4264 }
4265
4266 retval = TRUE;
4267
4268 out:
4269 sigprocmask (SIG_SETMASK, &old_set, NULL);
4270
4271 _DBUS_ASSERT_ERROR_XOR_BOOL (error, retval);
4272
4273 if (result_pipe[0] != -1)
4274 close (result_pipe[0]);
4275 if (result_pipe[1] != -1)
4276 close (result_pipe[1]);
4277 if (errors_pipe[0] != -1)
4278 close (errors_pipe[0]);
4279 if (errors_pipe[1] != -1)
4280 close (errors_pipe[1]);
4281
4282 return retval;
4283}
4284#endif
4285
4298 dbus_bool_t
4299_dbus_get_autolaunch_address (const char *scope,
4300 DBusString *address,
4301 DBusError *error)
4302{
4303#ifdef DBUS_ENABLE_X11_AUTOLAUNCH
4304 static const char arg_dbus_launch[] = "dbus-launch";
4305 static const char arg_autolaunch[] = "--autolaunch";
4306 static const char arg_binary_syntax[] = "--binary-syntax";
4307 static const char arg_close_stderr[] = "--close-stderr";
4308
4309 /* Perform X11-based autolaunch. (We also support launchd-based autolaunch,
4310 * but that's done elsewhere, and if it worked, this function wouldn't
4311 * be called.) */
4312 const char *display;
4313 const char *progpath;
4314 const char *argv[6];
4315 int i;
4316 DBusString uuid;
4317 dbus_bool_t retval;
4318
4319 if (_dbus_check_setuid ())
4320 {
4321 dbus_set_error_const (error, DBUS_ERROR_NOT_SUPPORTED,
4322 "Unable to autolaunch when setuid");
4323 return FALSE;
4324 }
4325
4326 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
4327 retval = FALSE;
4328
4329 /* fd.o #19997: if $DISPLAY isn't set to something useful, then
4330 * dbus-launch-x11 is just going to fail. Rather than trying to
4331 * run it, we might as well bail out early with a nice error.
4332 *
4333 * This is not strictly true in a world where the user bus exists,
4334 * because dbus-launch --autolaunch knows how to connect to that -
4335 * but if we were going to connect to the user bus, we'd have done
4336 * so before trying autolaunch: in any case. */
4337 display = _dbus_getenv ("DISPLAY");
4338
4339 if (display == NULL || display[0] == '\0')
4340 {
4341 dbus_set_error_const (error, DBUS_ERROR_NOT_SUPPORTED,
4342 "Unable to autolaunch a dbus-daemon without a $DISPLAY for X11");
4343 return FALSE;
4344 }
4345
4346 if (!_dbus_string_init (&uuid))
4347 {
4348 _DBUS_SET_OOM (error);
4349 return FALSE;
4350 }
4351
4352 if (!_dbus_get_local_machine_uuid_encoded (&uuid, error))
4353 {
4354 goto out;
4355 }
4356
4357#ifdef DBUS_ENABLE_EMBEDDED_TESTS
4358 progpath = _dbus_getenv ("DBUS_TEST_DBUS_LAUNCH");
4359
4360 if (progpath == NULL)
4361#endif
4362 progpath = DBUS_BINDIR "/dbus-launch";
4363 /*
4364 * argv[0] is always dbus-launch, that's the name what we'll
4365 * get from /proc, or ps(1), regardless what the progpath is,
4366 * see fd.o#69716
4367 */
4368 i = 0;
4369 argv[i] = arg_dbus_launch;
4370 ++i;
4371 argv[i] = arg_autolaunch;
4372 ++i;
4373 argv[i] = _dbus_string_get_data (&uuid);
4374 ++i;
4375 argv[i] = arg_binary_syntax;
4376 ++i;
4377 argv[i] = arg_close_stderr;
4378 ++i;
4379 argv[i] = NULL;
4380 ++i;
4381
4382 _dbus_assert (i == _DBUS_N_ELEMENTS (argv));
4383
4384 retval = _read_subprocess_line_argv (progpath,
4385 TRUE,
4386 argv, address, error);
4387
4388 out:
4389 _dbus_string_free (&uuid);
4390 return retval;
4391#else
4392 dbus_set_error_const (error, DBUS_ERROR_NOT_SUPPORTED,
4393 "Using X11 for dbus-daemon autolaunch was disabled at compile time, "
4394#ifdef DBUS_ENABLE_LAUNCHD
4395 "verify that org.freedesktop.dbus-session.plist is loaded or "
4396#endif
4397 "set your DBUS_SESSION_BUS_ADDRESS instead");
4398 return FALSE;
4399#endif
4400}
4401
4420 dbus_bool_t
4421_dbus_read_local_machine_uuid (DBusGUID *machine_id,
4422 dbus_bool_t create_if_not_found,
4423 DBusError *error)
4424{
4425 DBusError our_error = DBUS_ERROR_INIT;
4426 DBusError etc_error = DBUS_ERROR_INIT;
4427 DBusString filename;
4428 dbus_bool_t b;
4429
4430 _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
4431
4432 b = _dbus_read_uuid_file (&filename, machine_id, FALSE, &our_error);
4433 if (b)
4434 return TRUE;
4435
4436 /* Fallback to the system machine ID */
4437 _dbus_string_init_const (&filename, "/etc/machine-id");
4438 b = _dbus_read_uuid_file (&filename, machine_id, FALSE, &etc_error);
4439
4440 if (b)
4441 {
4442 if (create_if_not_found)
4443 {
4444 /* try to copy it to the DBUS_MACHINE_UUID_FILE, but do not
4445 * complain if that isn't possible for whatever reason */
4446 _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
4447 _dbus_write_uuid_file (&filename, machine_id, NULL);
4448 }
4449
4450 dbus_error_free (&our_error);
4451 return TRUE;
4452 }
4453
4454 if (!create_if_not_found)
4455 {
4456 dbus_set_error (error, etc_error.name,
4457 "D-Bus library appears to be incorrectly set up: "
4458 "see the manual page for dbus-uuidgen to correct "
4459 "this issue. (%s; %s)",
4460 our_error.message, etc_error.message);
4461 dbus_error_free (&our_error);
4462 dbus_error_free (&etc_error);
4463 return FALSE;
4464 }
4465
4466 dbus_error_free (&our_error);
4467 dbus_error_free (&etc_error);
4468
4469 /* if none found, try to make a new one */
4470 _dbus_string_init_const (&filename, DBUS_MACHINE_UUID_FILE);
4471
4472 if (!_dbus_generate_uuid (machine_id, error))
4473 return FALSE;
4474
4475 return _dbus_write_uuid_file (&filename, machine_id, error);
4476}
4477
4485 dbus_bool_t
4486_dbus_lookup_launchd_socket (DBusString *socket_path,
4487 const char *launchd_env_var,
4488 DBusError *error)
4489{
4490#ifdef DBUS_ENABLE_LAUNCHD
4491 char *argv[4];
4492 int i;
4493
4494 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
4495
4496 if (_dbus_check_setuid ())
4497 {
4498 dbus_set_error_const (error, DBUS_ERROR_NOT_SUPPORTED,
4499 "Unable to find launchd socket when setuid");
4500 return FALSE;
4501 }
4502
4503 i = 0;
4504 argv[i] = "launchctl";
4505 ++i;
4506 argv[i] = "getenv";
4507 ++i;
4508 argv[i] = (char*)launchd_env_var;
4509 ++i;
4510 argv[i] = NULL;
4511 ++i;
4512
4513 _dbus_assert (i == _DBUS_N_ELEMENTS (argv));
4514
4515 if (!_read_subprocess_line_argv(argv[0], TRUE, argv, socket_path, error))
4516 {
4517 return FALSE;
4518 }
4519
4520 /* no error, but no result either */
4521 if (_dbus_string_get_length(socket_path) == 0)
4522 {
4523 return FALSE;
4524 }
4525
4526 /* strip the carriage-return */
4527 _dbus_string_shorten(socket_path, 1);
4528 return TRUE;
4529#else /* DBUS_ENABLE_LAUNCHD */
4530 dbus_set_error(error, DBUS_ERROR_NOT_SUPPORTED,
4531 "can't lookup socket from launchd; launchd support not compiled in");
4532 return FALSE;
4533#endif
4534}
4535
4536#ifdef DBUS_ENABLE_LAUNCHD
4537static dbus_bool_t
4538_dbus_lookup_session_address_launchd (dbus_bool_t *supported,
4539 DBusString *address,
4540 DBusError *error)
4541{
4542 dbus_bool_t valid_socket;
4543 DBusString socket_path;
4544
4545 if (!_dbus_string_init (&socket_path))
4546 {
4547 _DBUS_SET_OOM (error);
4548 return FALSE;
4549 }
4550
4551 valid_socket = _dbus_lookup_launchd_socket (&socket_path, "DBUS_LAUNCHD_SESSION_BUS_SOCKET", NULL);
4552
4553 if (!valid_socket)
4554 {
4555 _dbus_verbose ("launchd did not provide a socket path");
4556 _dbus_string_free(&socket_path);
4557 *supported = FALSE;
4558 return TRUE; /* Cannot use it, but not an error */
4559 }
4560 if (!_dbus_string_append (address, "unix:path="))
4561 {
4562 _DBUS_SET_OOM (error);
4563 _dbus_string_free(&socket_path);
4564 return FALSE;
4565 }
4566 if (!_dbus_string_copy (&socket_path, 0, address,
4567 _dbus_string_get_length (address)))
4568 {
4569 _DBUS_SET_OOM (error);
4570 _dbus_string_free(&socket_path);
4571 return FALSE;
4572 }
4573
4574 _dbus_string_free(&socket_path);
4575 return TRUE;
4576}
4577#endif
4578
4579static dbus_bool_t
4580_dbus_lookup_user_bus (dbus_bool_t *supported,
4581 DBusString *address,
4582 DBusError *error)
4583{
4584 const char *runtime_dir = _dbus_getenv ("XDG_RUNTIME_DIR");
4585 dbus_bool_t ret = FALSE;
4586 struct stat stbuf;
4587 DBusString user_bus_path;
4588
4589 if (runtime_dir == NULL)
4590 {
4591 _dbus_verbose ("XDG_RUNTIME_DIR not found in environment");
4592 *supported = FALSE;
4593 return TRUE; /* Cannot use it, but not an error */
4594 }
4595
4596 if (!_dbus_string_init (&user_bus_path))
4597 {
4598 _DBUS_SET_OOM (error);
4599 return FALSE;
4600 }
4601
4602 if (!_dbus_string_append_printf (&user_bus_path, "%s/bus", runtime_dir))
4603 {
4604 _DBUS_SET_OOM (error);
4605 goto out;
4606 }
4607
4608 if (lstat (_dbus_string_get_const_data (&user_bus_path), &stbuf) == -1)
4609 {
4610 _dbus_verbose ("XDG_RUNTIME_DIR/bus not available: %s",
4611 _dbus_strerror (errno));
4612 *supported = FALSE;
4613 ret = TRUE; /* Cannot use it, but not an error */
4614 goto out;
4615 }
4616
4617 if (stbuf.st_uid != getuid ())
4618 {
4619 _dbus_verbose ("XDG_RUNTIME_DIR/bus owned by uid %ld, not our uid %ld",
4620 (long) stbuf.st_uid, (long) getuid ());
4621 *supported = FALSE;
4622 ret = TRUE; /* Cannot use it, but not an error */
4623 goto out;
4624 }
4625
4626 if ((stbuf.st_mode & S_IFMT) != S_IFSOCK)
4627 {
4628 _dbus_verbose ("XDG_RUNTIME_DIR/bus is not a socket: st_mode = 0o%lo",
4629 (long) stbuf.st_mode);
4630 *supported = FALSE;
4631 ret = TRUE; /* Cannot use it, but not an error */
4632 goto out;
4633 }
4634
4635 if (!_dbus_string_append (address, "unix:path=") ||
4636 !_dbus_address_append_escaped (address, &user_bus_path))
4637 {
4638 _DBUS_SET_OOM (error);
4639 goto out;
4640 }
4641
4642 *supported = TRUE;
4643 ret = TRUE;
4644
4645out:
4646 _dbus_string_free (&user_bus_path);
4647 return ret;
4648}
4649
4669 dbus_bool_t
4670_dbus_lookup_session_address (dbus_bool_t *supported,
4671 DBusString *address,
4672 DBusError *error)
4673{
4674#ifdef DBUS_ENABLE_LAUNCHD
4675 *supported = TRUE;
4676 return _dbus_lookup_session_address_launchd (supported, address, error);
4677#else
4678 *supported = FALSE;
4679
4680 if (!_dbus_lookup_user_bus (supported, address, error))
4681 return FALSE;
4682 else if (*supported)
4683 return TRUE;
4684
4685 /* On non-Mac Unix platforms, if the session address isn't already
4686 * set in DBUS_SESSION_BUS_ADDRESS environment variable and the
4687 * $XDG_RUNTIME_DIR/bus can't be used, we punt and fall back to the
4688 * autolaunch: global default; see init_session_address in
4689 * dbus/dbus-bus.c. */
4690 return TRUE;
4691#endif
4692}
4693
4701void
4702_dbus_flush_caches (void)
4703{
4704 _dbus_user_database_flush_system ();
4705}
4706
4720 dbus_bool_t
4721_dbus_append_keyring_directory_for_credentials (DBusString *directory,
4722 DBusCredentials *credentials)
4723{
4724 DBusString homedir;
4725 DBusString dotdir;
4726 dbus_uid_t uid;
4727
4728 _dbus_assert (credentials != NULL);
4729 _dbus_assert (!_dbus_credentials_are_anonymous (credentials));
4730
4731 if (!_dbus_string_init (&homedir))
4732 return FALSE;
4733
4734 uid = _dbus_credentials_get_unix_uid (credentials);
4735 _dbus_assert (uid != DBUS_UID_UNSET);
4736
4737 if (!_dbus_homedir_from_uid (uid, &homedir))
4738 goto failed;
4739
4740#ifdef DBUS_ENABLE_EMBEDDED_TESTS
4741 {
4742 const char *override;
4743
4744 override = _dbus_getenv ("DBUS_TEST_HOMEDIR");
4745 if (override != NULL && *override != '\0')
4746 {
4747 _dbus_string_set_length (&homedir, 0);
4748 if (!_dbus_string_append (&homedir, override))
4749 goto failed;
4750
4751 _dbus_verbose ("Using fake homedir for testing: %s\n",
4752 _dbus_string_get_const_data (&homedir));
4753 }
4754 else
4755 {
4756 /* Not strictly thread-safe, but if we fail at thread-safety here,
4757 * the worst that will happen is some extra warnings. */
4758 static dbus_bool_t already_warned = FALSE;
4759 if (!already_warned)
4760 {
4761 _dbus_warn ("Using %s for testing, set DBUS_TEST_HOMEDIR to avoid",
4762 _dbus_string_get_const_data (&homedir));
4763 already_warned = TRUE;
4764 }
4765 }
4766 }
4767#endif
4768
4769 _dbus_string_init_const (&dotdir, ".dbus-keyrings");
4770 if (!_dbus_concat_dir_and_file (&homedir,
4771 &dotdir))
4772 goto failed;
4773
4774 if (!_dbus_string_copy (&homedir, 0,
4775 directory, _dbus_string_get_length (directory))) {
4776 goto failed;
4777 }
4778
4779 _dbus_string_free (&homedir);
4780 return TRUE;
4781
4782 failed:
4783 _dbus_string_free (&homedir);
4784 return FALSE;
4785}
4786
4787/* Documented in dbus-sysdeps-win.c, does nothing on Unix */
4788 dbus_bool_t
4789_dbus_daemon_unpublish_session_bus_address (void)
4790{
4791 return TRUE;
4792}
4793
4800 dbus_bool_t
4801_dbus_get_is_errno_eagain_or_ewouldblock (int e)
4802{
4803 /* Avoid the -Wlogical-op GCC warning, which can be triggered when EAGAIN and
4804 * EWOULDBLOCK are numerically equal, which is permitted as described by
4805 * errno(3).
4806 */
4807#if EAGAIN == EWOULDBLOCK
4808 return e == EAGAIN;
4809#else
4810 return e == EAGAIN || e == EWOULDBLOCK;
4811#endif
4812}
4813
4821 dbus_bool_t
4822_dbus_delete_directory (const DBusString *filename,
4823 DBusError *error)
4824{
4825 const char *filename_c;
4826
4827 _DBUS_ASSERT_ERROR_IS_CLEAR (error);
4828
4829 filename_c = _dbus_string_get_const_data (filename);
4830
4831 if (rmdir (filename_c) != 0)
4832 {
4833 dbus_set_error (error, DBUS_ERROR_FAILED,
4834 "Failed to remove directory %s: %s\n",
4835 filename_c, _dbus_strerror (errno));
4836 return FALSE;
4837 }
4838
4839 return TRUE;
4840}
4841
4849 dbus_bool_t
4850_dbus_socket_can_pass_unix_fd (DBusSocket fd)
4851{
4852#ifdef SCM_RIGHTS
4853 union {
4854 struct sockaddr sa;
4855 struct sockaddr_storage storage;
4856 struct sockaddr_un un;
4857 } sa_buf;
4858
4859 socklen_t sa_len = sizeof(sa_buf);
4860
4861 _DBUS_ZERO(sa_buf);
4862
4863 if (getsockname(fd.fd, &sa_buf.sa, &sa_len) < 0)
4864 return FALSE;
4865
4866 return sa_buf.sa.sa_family == AF_UNIX;
4867
4868#else
4869 return FALSE;
4870
4871#endif
4872}
4873
4874/*
4875 * Similar to Solaris fdwalk(3), but without the ability to stop iteration,
4876 * and may call func for integers that are not actually valid fds.
4877 */
4878static void
4879act_on_fds_3_and_up (void (*func) (int fd))
4880{
4881 int maxfds, i;
4882
4883#if defined(__linux__) && defined(__GLIBC__)
4884 DIR *d;
4885
4886 /* On Linux we can optimize this a bit if /proc is available. If it
4887 isn't available, fall back to the brute force way. */
4888
4889 d = opendir ("/proc/self/fd");
4890 if (d)
4891 {
4892 for (;;)
4893 {
4894 struct dirent *de;
4895 int fd;
4896 long l;
4897 char *e = NULL;
4898
4899 de = readdir (d);
4900 if (!de)
4901 break;
4902
4903 if (de->d_name[0] == '.')
4904 continue;
4905
4906 errno = 0;
4907 l = strtol (de->d_name, &e, 10);
4908 if (errno != 0 || e == NULL || *e != '\0')
4909 continue;
4910
4911 fd = (int) l;
4912 if (fd < 3)
4913 continue;
4914
4915 if (fd == dirfd (d))
4916 continue;
4917
4918 func (fd);
4919 }
4920
4921 closedir (d);
4922 return;
4923 }
4924#endif
4925
4926 maxfds = sysconf (_SC_OPEN_MAX);
4927
4928 /* Pick something reasonable if for some reason sysconf says
4929 * unlimited.
4930 */
4931 if (maxfds < 0)
4932 maxfds = 1024;
4933
4934 /* close all inherited fds */
4935 for (i = 3; i < maxfds; i++)
4936 func (i);
4937}
4938
4939/* Some library implementations of closefrom() are not async-signal-safe,
4940 * and we call _dbus_close_all() after forking, so we only do this on
4941 * operating systems where we know that closefrom() is a system call */
4942#if defined(HAVE_CLOSEFROM) && ( \
4943 defined(__FreeBSD__) || \
4944 defined(__NetBSD__) || \
4945 defined(__OpenBSD__) || \
4946 defined(__sun__) && defined(F_CLOSEFROM) \
4947)
4948#define CLOSEFROM_SIGNAL_SAFE 1
4949#else
4950#define CLOSEFROM_SIGNAL_SAFE 0
4951static void
4952close_ignore_error (int fd)
4953{
4954 close (fd);
4955}
4956#endif
4957
4962void
4963_dbus_close_all (void)
4964{
4965#ifdef HAVE_CLOSE_RANGE
4966 if (close_range (3, INT_MAX, 0) == 0)
4967 return;
4968#endif
4969
4970#if CLOSEFROM_SIGNAL_SAFE
4971 closefrom (3);
4972#else
4973 act_on_fds_3_and_up (close_ignore_error);
4974#endif
4975}
4976
4981void
4982_dbus_fd_set_all_close_on_exec (void)
4983{
4984#if defined(HAVE_CLOSE_RANGE) && defined(CLOSE_RANGE_CLOEXEC)
4985 if (close_range (3, INT_MAX, CLOSE_RANGE_CLOEXEC) == 0)
4986 return;
4987#endif
4988
4989 act_on_fds_3_and_up (_dbus_fd_set_close_on_exec);
4990}
4991
5001 dbus_bool_t
5002_dbus_check_setuid (void)
5003{
5004 /* TODO: get __libc_enable_secure exported from glibc.
5005 * See http://www.openwall.com/lists/owl-dev/2012/08/14/1
5006 */
5007#if 0 && defined(HAVE_LIBC_ENABLE_SECURE)
5008 {
5009 /* See glibc/include/unistd.h */
5010 extern int __libc_enable_secure;
5011 return __libc_enable_secure;
5012 }
5013#elif defined(HAVE_ISSETUGID)
5014 /* BSD: http://www.freebsd.org/cgi/man.cgi?query=issetugid&sektion=2 */
5015 return issetugid ();
5016#else
5017 uid_t ruid, euid, suid; /* Real, effective and saved user ID's */
5018 gid_t rgid, egid, sgid; /* Real, effective and saved group ID's */
5019
5020 /* We call into this function from _dbus_threads_init_platform_specific()
5021 * to make sure these are initialized before we start threading. */
5022 static dbus_bool_t check_setuid_initialised;
5023 static dbus_bool_t is_setuid;
5024
5025 if (_DBUS_UNLIKELY (!check_setuid_initialised))
5026 {
5027#ifdef HAVE_GETRESUID
5028 if (getresuid (&ruid, &euid, &suid) != 0 ||
5029 getresgid (&rgid, &egid, &sgid) != 0)
5030#endif /* HAVE_GETRESUID */
5031 {
5032 suid = ruid = getuid ();
5033 sgid = rgid = getgid ();
5034 euid = geteuid ();
5035 egid = getegid ();
5036 }
5037
5038 check_setuid_initialised = TRUE;
5039 is_setuid = (ruid != euid || ruid != suid ||
5040 rgid != egid || rgid != sgid);
5041
5042 }
5043 return is_setuid;
5044#endif
5045}
5046
5054 dbus_bool_t
5055_dbus_append_address_from_socket (DBusSocket fd,
5056 DBusString *address,
5057 DBusError *error)
5058{
5059 union {
5060 struct sockaddr sa;
5061 struct sockaddr_storage storage;
5062 struct sockaddr_un un;
5063 struct sockaddr_in ipv4;
5064 struct sockaddr_in6 ipv6;
5065 } socket;
5066 char hostip[INET6_ADDRSTRLEN];
5067 socklen_t size = sizeof (socket);
5068 DBusString path_str;
5069 const char *family_name = NULL;
5070 dbus_uint16_t port;
5071
5072 if (getsockname (fd.fd, &socket.sa, &size))
5073 goto err;
5074
5075 switch (socket.sa.sa_family)
5076 {
5077 case AF_UNIX:
5078 if (socket.un.sun_path[0]=='\0')
5079 {
5080 _dbus_string_init_const (&path_str, &(socket.un.sun_path[1]));
5081 if (_dbus_string_append (address, "unix:abstract=") &&
5082 _dbus_address_append_escaped (address, &path_str))
5083 {
5084 return TRUE;
5085 }
5086 else
5087 {
5088 _DBUS_SET_OOM (error);
5089 return FALSE;
5090 }
5091 }
5092 else
5093 {
5094 _dbus_string_init_const (&path_str, socket.un.sun_path);
5095 if (_dbus_string_append (address, "unix:path=") &&
5096 _dbus_address_append_escaped (address, &path_str))
5097 {
5098 return TRUE;
5099 }
5100 else
5101 {
5102 _DBUS_SET_OOM (error);
5103 return FALSE;
5104 }
5105 }
5106 /* not reached */
5107 break;
5108
5109 case AF_INET:
5110#ifdef AF_INET6
5111 case AF_INET6:
5112#endif
5113 _dbus_string_init_const (&path_str, hostip);
5114
5115 if (_dbus_inet_sockaddr_to_string (&socket, size, hostip, sizeof (hostip),
5116 &family_name, &port, error))
5117 {
5118 if (_dbus_string_append_printf (address, "tcp:family=%s,port=%u,host=",
5119 family_name, port) &&
5120 _dbus_address_append_escaped (address, &path_str))
5121 {
5122 return TRUE;
5123 }
5124 else
5125 {
5126 _DBUS_SET_OOM (error);
5127 return FALSE;
5128 }
5129 }
5130 else
5131 {
5132 return FALSE;
5133 }
5134 /* not reached */
5135 break;
5136
5137 default:
5138 dbus_set_error (error,
5139 _dbus_error_from_errno (EINVAL),
5140 "Failed to read address from socket: Unknown socket type.");
5141 return FALSE;
5142 }
5143 err:
5144 dbus_set_error (error,
5145 _dbus_error_from_errno (errno),
5146 "Failed to read address from socket: %s",
5147 _dbus_strerror (errno));
5148 return FALSE;
5149}
5150
5151int
5152_dbus_save_socket_errno (void)
5153{
5154 return errno;
5155}
5156
5157void
5158_dbus_restore_socket_errno (int saved_errno)
5159{
5160 errno = saved_errno;
5161}
5162
5163static const char *syslog_tag = "dbus";
5164#ifdef HAVE_SYSLOG_H
5165static DBusLogFlags log_flags = DBUS_LOG_FLAGS_STDERR;
5166#endif
5167
5182void
5183_dbus_init_system_log (const char *tag,
5184 DBusLogFlags flags)
5185{
5186 /* We never want to turn off logging completely */
5187 _dbus_assert (
5188 (flags & (DBUS_LOG_FLAGS_STDERR | DBUS_LOG_FLAGS_SYSTEM_LOG)) != 0);
5189
5190 syslog_tag = tag;
5191
5192#ifdef HAVE_SYSLOG_H
5193 log_flags = flags;
5194
5195 if (log_flags & DBUS_LOG_FLAGS_SYSTEM_LOG)
5196 openlog (tag, LOG_PID, LOG_DAEMON);
5197#endif
5198}
5199
5207void
5208_dbus_logv (DBusSystemLogSeverity severity,
5209 const char *msg,
5210 va_list args)
5211{
5212 va_list tmp;
5213#ifdef HAVE_SYSLOG_H
5214 if (log_flags & DBUS_LOG_FLAGS_SYSTEM_LOG)
5215 {
5216 int flags = LOG_DAEMON | LOG_WARNING;
5217 switch (severity)
5218 {
5219 case DBUS_SYSTEM_LOG_INFO:
5220 flags = LOG_DAEMON | LOG_INFO;
5221 break;
5222 case DBUS_SYSTEM_LOG_WARNING:
5223 flags = LOG_DAEMON | LOG_WARNING;
5224 break;
5225 case DBUS_SYSTEM_LOG_SECURITY:
5226 flags = LOG_AUTH | LOG_NOTICE;
5227 break;
5228 case DBUS_SYSTEM_LOG_ERROR:
5229 flags = LOG_DAEMON|LOG_CRIT;
5230 break;
5231 default:
5232 _dbus_assert_not_reached ("invalid log severity");
5233 }
5234
5235 va_copy (tmp, args);
5236 vsyslog (flags, msg, tmp);
5237 va_end (tmp);
5238 }
5239
5240 /* If we don't have syslog.h, we always behave as though stderr was in
5241 * the flags */
5242 if (log_flags & DBUS_LOG_FLAGS_STDERR)
5243#endif
5244 {
5245 va_copy (tmp, args);
5246 fprintf (stderr, "%s[" DBUS_PID_FORMAT "]: ", syslog_tag, _dbus_getpid ());
5247 vfprintf (stderr, msg, tmp);
5248 fputc ('\n', stderr);
5249 va_end (tmp);
5250 }
5251}
5252
5253/*
5254 * Return the low-level representation of a socket error, as used by
5255 * cross-platform socket APIs like inet_ntop(), send() and recv(). This
5256 * is the standard errno on Unix, but is WSAGetLastError() on Windows.
5257 *
5258 * Some libdbus internal functions copy this into errno, but with
5259 * hindsight that was probably a design flaw.
5260 */
5261int
5262_dbus_get_low_level_socket_errno (void)
5263{
5264 return errno;
5265}
5266
5267/* tests in dbus-sysdeps-util.c */
_dbus_address_append_escaped
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:109
_dbus_credentials_clear
void _dbus_credentials_clear(DBusCredentials *credentials)
Clear all credentials in the object.
Definition dbus-credentials.c:688
_dbus_credentials_get_unix_uid
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't contain...
Definition dbus-credentials.c:440
_dbus_credentials_take_pid_fd
_DBUS_GNUC_NORETURN void _dbus_credentials_take_pid_fd(DBusCredentials *credentials, int pid_fd)
Add a UNIX process ID FD to the credentials.
Definition dbus-credentials.c:200
_dbus_credentials_add_linux_security_label
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.
Definition dbus-credentials.c:317
_dbus_credentials_take_unix_gids
void _dbus_credentials_take_unix_gids(DBusCredentials *credentials, dbus_gid_t *gids, size_t n_gids)
Add UNIX group IDs to the credentials, replacing any group IDs that might already have been present.
Definition dbus-credentials.c:252
_dbus_credentials_add_unix_uid
dbus_bool_t _dbus_credentials_add_unix_uid(DBusCredentials *credentials, dbus_uid_t uid)
Add a UNIX user ID to the credentials.
Definition dbus-credentials.c:220
_dbus_credentials_add_pid
dbus_bool_t _dbus_credentials_add_pid(DBusCredentials *credentials, dbus_pid_t pid)
Add a UNIX process ID to the credentials.
Definition dbus-credentials.c:181
_dbus_credentials_add_adt_audit_data
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.
Definition dbus-credentials.c:341
_dbus_credentials_are_anonymous
dbus_bool_t _dbus_credentials_are_anonymous(DBusCredentials *credentials)
Checks whether a credentials object contains a user identity.
Definition dbus-credentials.c:558
DBUS_ERROR_INIT
#define DBUS_ERROR_INIT
Expands to a suitable initializer for a DBusError on the stack.
Definition dbus-errors.h:64
dbus_move_error
void dbus_move_error(DBusError *src, DBusError *dest)
Moves an error src into dest, freeing src and overwriting dest.
Definition dbus-errors.c:281
dbus_set_error_const
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:245
dbus_error_init
void dbus_error_init(DBusError *error)
Initializes a DBusError structure.
Definition dbus-errors.c:190
dbus_set_error
void dbus_set_error(DBusError *error, const char *name, const char *format,...)
Assigns an error name and message to a DBusError.
Definition dbus-errors.c:356
dbus_error_free
void dbus_error_free(DBusError *error)
Frees an error that's been set (or just initialized), then reinitializes the error as in dbus_error_i...
Definition dbus-errors.c:213
_dbus_file_get_contents
dbus_bool_t _dbus_file_get_contents(DBusString *str, const DBusString *filename, DBusError *error)
Appends the contents of the given file to the string, returning error code.
Definition dbus-file-unix.c:63
_dbus_assert_not_reached
#define _dbus_assert_not_reached(explanation)
Aborts with an error message if called.
Definition dbus-internals.h:164
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition dbus-internals.h:153
_DBUS_UNLOCK
#define _DBUS_UNLOCK(name)
Unlocks a global lock.
Definition dbus-internals.h:438
READ_END
#define READ_END
Helps remember which end of the pipe is which.
Definition dbus-spawn-unix.c:895
WRITE_END
#define WRITE_END
Helps remember which end of the pipe is which.
Definition dbus-spawn-unix.c:897
_DBUS_LOCK
#define _DBUS_LOCK(name)
Locks a global lock, initializing it first if necessary.
Definition dbus-internals.h:437
_dbus_error_from_errno
const char * _dbus_error_from_errno(int error_number)
Converts a UNIX errno, or Windows errno or WinSock error value into a DBusError name.
Definition dbus-sysdeps.c:565
_dbus_generate_uuid
dbus_bool_t _dbus_generate_uuid(DBusGUID *uuid, DBusError *error)
Generates a new UUID.
Definition dbus-internals.c:752
_dbus_strdup
char * _dbus_strdup(const char *str)
Duplicates a string.
Definition dbus-internals.c:621
_dbus_read_uuid_file
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.
Definition dbus-internals.c:931
_dbus_user_database_flush_system
void _dbus_user_database_flush_system(void)
Flushes the system global user database;.
Definition dbus-userdb.c:396
_dbus_get_local_machine_uuid_encoded
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.
Definition dbus-internals.c:983
_dbus_write_uuid_file
dbus_bool_t _dbus_write_uuid_file(const DBusString *filename, const DBusGUID *uuid, DBusError *error)
Write the give UUID to a file.
Definition dbus-internals.c:882
_dbus_homedir_from_uid
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:466
_dbus_warn
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
Definition dbus-internals.c:278
_DBUS_N_ELEMENTS
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
Definition dbus-internals.h:189
_DBUS_ZERO
#define _DBUS_ZERO(object)
Sets all bits in an object to zero.
Definition dbus-internals.h:194
_DBUS_INT32_MAX
#define _DBUS_INT32_MAX
Maximum value of type "int32".
Definition dbus-internals.h:323
_dbus_list_pop_first
void * _dbus_list_pop_first(DBusList **list)
Removes the first value in the list and returns it.
Definition dbus-list.c:679
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition dbus-list.c:273
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
Definition dbus-macros.h:51
TRUE
#define TRUE
Expands to "1".
Definition dbus-macros.h:41
FALSE
#define FALSE
Expands to "0".
Definition dbus-macros.h:44
_dbus_verbose_bytes_of_string
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.
Definition dbus-marshal-basic.c:1428
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition dbus-memory.c:710
dbus_realloc
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:610
dbus_new
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition dbus-memory.h:59
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition dbus-memory.h:60
dbus_malloc
void * dbus_malloc(size_t bytes)
Allocates the given number of bytes, as with standard malloc().
Definition dbus-memory.c:470
DBUS_MAXIMUM_MESSAGE_UNIX_FDS
#define DBUS_MAXIMUM_MESSAGE_UNIX_FDS
The maximum total number of unix fds in a message.
Definition dbus-protocol.h:220
DBUS_ERROR_NOT_SUPPORTED
#define DBUS_ERROR_NOT_SUPPORTED
Requested operation isn't supported (like ENOSYS on UNIX).
Definition dbus-protocol.h:375
DBUS_ERROR_BAD_ADDRESS
#define DBUS_ERROR_BAD_ADDRESS
A D-Bus bus address was malformed.
Definition dbus-protocol.h:373
DBUS_ERROR_IO_ERROR
#define DBUS_ERROR_IO_ERROR
Something went wrong reading or writing to a socket, for example.
Definition dbus-protocol.h:371
DBUS_ERROR_FAILED
#define DBUS_ERROR_FAILED
A generic error; "something went wrong" - see the error message for more.
Definition dbus-protocol.h:361
DBUS_ERROR_SPAWN_EXEC_FAILED
#define DBUS_ERROR_SPAWN_EXEC_FAILED
While starting a new process, the exec() call failed.
Definition dbus-protocol.h:422
DBUS_ERROR_NO_MEMORY
#define DBUS_ERROR_NO_MEMORY
There was not enough memory to complete an operation.
Definition dbus-protocol.h:363
_dbus_string_set_length
dbus_bool_t _dbus_string_set_length(DBusString *str, int length)
Sets the length of a string.
Definition dbus-string.c:847
_dbus_string_append
dbus_bool_t _dbus_string_append(DBusString *str, const char *buffer)
Appends a nul-terminated C-style string to a DBusString.
Definition dbus-string.c:980
_dbus_string_init
dbus_bool_t _dbus_string_init(DBusString *str)
Initializes a string.
Definition dbus-string.c:182
_dbus_string_init_const
void _dbus_string_init_const(DBusString *str, const char *value)
Initializes a constant string.
Definition dbus-string.c:197
_dbus_string_copy
dbus_bool_t _dbus_string_copy(const DBusString *source, int start, DBusString *dest, int insert_at)
Like _dbus_string_move(), but does not delete the section of the source string that's copied to the d...
Definition dbus-string.c:1345
_dbus_string_init_preallocated
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:139
_dbus_string_find
dbus_bool_t _dbus_string_find(const DBusString *str, int start, const char *substr, int *found)
Finds the given substring in the string, returning TRUE and filling in the byte index where the subst...
Definition dbus-string.c:1666
_dbus_string_get_data_len
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:535
_dbus_string_free
void _dbus_string_free(DBusString *str)
Frees a string created by _dbus_string_init(), and fills it with the same contents as _DBUS_STRING_IN...
Definition dbus-string.c:278
_dbus_string_shorten
void _dbus_string_shorten(DBusString *str, int length_to_remove)
Makes a string shorter by the given number of bytes.
Definition dbus-string.c:825
_dbus_string_parse_uint
DBUS_PRIVATE_EXPORT dbus_bool_t _dbus_string_parse_uint(const DBusString *str, int start, unsigned long *value_return, int *end_return)
Parses an unsigned integer contained in a DBusString.
Definition dbus-sysdeps.c:410
_dbus_string_lengthen
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:805
_dbus_string_append_byte
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:1190
_dbus_string_append_printf
dbus_bool_t _dbus_string_append_printf(DBusString *str, const char *format,...)
Appends a printf-style formatted string to the DBusString.
Definition dbus-string.c:1147
_dbus_fd_clear_close_on_exec
void _dbus_fd_clear_close_on_exec(int fd)
Sets the file descriptor to not be close-on-exec.
Definition dbus-sysdeps-unix.c:3705
_dbus_fd_set_all_close_on_exec
void _dbus_fd_set_all_close_on_exec(void)
Sets all file descriptors except the first three (i.e.
Definition dbus-sysdeps-unix.c:4982
_dbus_close
dbus_bool_t _dbus_close(int fd, DBusError *error)
Closes a file descriptor.
Definition dbus-sysdeps-unix.c:3727
_dbus_write
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 ...
Definition dbus-sysdeps-unix.c:827
_dbus_write_two
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.
Definition dbus-sysdeps-unix.c:873
_dbus_lookup_launchd_socket
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.
Definition dbus-sysdeps-unix.c:4486
_dbus_listen_systemd_sockets
int _dbus_listen_systemd_sockets(DBusSocket **fds, DBusError *error)
Acquires one or more sockets passed in from systemd.
Definition dbus-sysdeps-unix.c:1299
_dbus_append_address_from_socket
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.
Definition dbus-sysdeps-unix.c:5055
_dbus_user_info_fill
dbus_bool_t _dbus_user_info_fill(DBusUserInfo *info, const DBusString *username, DBusError *error)
Gets user info for the given username.
Definition dbus-sysdeps-unix.c:2966
_dbus_close_all
void _dbus_close_all(void)
Closes all file descriptors except the first three (i.e.
Definition dbus-sysdeps-unix.c:4963
_dbus_dup
int _dbus_dup(int fd, DBusError *error)
Duplicates a file descriptor.
Definition dbus-sysdeps-unix.c:3755
_dbus_fd_set_close_on_exec
void _dbus_fd_set_close_on_exec(int fd)
Sets the file descriptor to be close on exec.
Definition dbus-sysdeps-unix.c:3683
_dbus_read
int _dbus_read(int fd, DBusString *buffer, int count)
Thin wrapper around the read() system call that appends the data it reads to the DBusString buffer.
Definition dbus-sysdeps-unix.c:767
_dbus_ensure_standard_fds
dbus_bool_t _dbus_ensure_standard_fds(DBusEnsureStandardFdsFlags flags, const char **error_str_p)
Ensure that the standard file descriptors stdin, stdout and stderr are open, by opening /dev/null if ...
Definition dbus-sysdeps-unix.c:179
_dbus_geteuid
dbus_uid_t _dbus_geteuid(void)
Gets our effective UID.
Definition dbus-sysdeps-unix.c:3145
_dbus_user_info_fill_uid
dbus_bool_t _dbus_user_info_fill_uid(DBusUserInfo *info, dbus_uid_t uid, DBusError *error)
Gets user info for the given user ID.
Definition dbus-sysdeps-unix.c:2983
_dbus_logv
void _dbus_logv(DBusSystemLogSeverity severity, const char *msg, va_list args)
Log a message to the system log file (e.g.
Definition dbus-sysdeps-unix.c:5208
_dbus_get_monotonic_time
void _dbus_get_monotonic_time(dbus_int64_t *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
Definition dbus-sysdeps-unix.c:3381
_dbus_read_local_machine_uuid
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're running on from the dbus configuration.
Definition dbus-sysdeps-unix.c:4421
_DBUS_POLLOUT
#define _DBUS_POLLOUT
Writing now will not block.
Definition dbus-sysdeps.h:448
dbus_uid_t
unsigned long dbus_uid_t
A user ID.
Definition dbus-sysdeps.h:141
_dbus_get_is_errno_eagain_or_ewouldblock
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).
Definition dbus-sysdeps-unix.c:4801
_dbus_pid_for_log
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...
Definition dbus-sysdeps-unix.c:3157
dbus_pid_t
unsigned long dbus_pid_t
A process ID.
Definition dbus-sysdeps.h:139
_dbus_read_socket
int _dbus_read_socket(DBusSocket fd, DBusString *buffer, int count)
Like _dbus_read(), but only works on sockets so is available on Windows.
Definition dbus-sysdeps-unix.c:338
_dbus_exit
void _dbus_exit(int code)
Exit the process, returning the given value.
Definition dbus-sysdeps-unix.c:3641
_DBUS_POLLERR
#define _DBUS_POLLERR
Error condition.
Definition dbus-sysdeps.h:450
_dbus_socket_can_pass_unix_fd
dbus_bool_t _dbus_socket_can_pass_unix_fd(DBusSocket fd)
Checks whether file descriptors may be passed via the socket.
Definition dbus-sysdeps-unix.c:4850
_dbus_write_socket
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.
Definition dbus-sysdeps-unix.c:356
_dbus_atomic_set_nonzero
void _dbus_atomic_set_nonzero(DBusAtomic *atomic)
Atomically set the value of an integer to something nonzero.
Definition dbus-sysdeps-unix.c:3279
_dbus_socketpair
dbus_bool_t _dbus_socketpair(DBusSocket *fd1, DBusSocket *fd2, dbus_bool_t blocking, DBusError *error)
Creates pair of connect sockets (as in socketpair()).
Definition dbus-sysdeps-unix.c:3884
dbus_gid_t
unsigned long dbus_gid_t
A group ID.
Definition dbus-sysdeps.h:143
_dbus_read_socket_with_unix_fds
int _dbus_read_socket_with_unix_fds(DBusSocket fd, DBusString *buffer, int count, int *fds, unsigned int *n_fds)
Like _dbus_read_socket() but also tries to read unix fds from the socket.
Definition dbus-sysdeps-unix.c:394
_dbus_append_keyring_directory_for_credentials
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.
Definition dbus-sysdeps-unix.c:4721
DBUS_UID_UNSET
#define DBUS_UID_UNSET
an invalid UID used to represent an uninitialized dbus_uid_t field
Definition dbus-sysdeps.h:148
_dbus_atomic_dec
dbus_int32_t _dbus_atomic_dec(DBusAtomic *atomic)
Atomically decrement an integer.
Definition dbus-sysdeps-unix.c:3205
_dbus_read_credentials_socket
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...
Definition dbus-sysdeps-unix.c:2209
DBUS_PID_UNSET
#define DBUS_PID_UNSET
an invalid PID used to represent an uninitialized dbus_pid_t field
Definition dbus-sysdeps.h:146
_dbus_getenv
const char * _dbus_getenv(const char *varname)
Wrapper for getenv().
Definition dbus-sysdeps.c:197
_dbus_listen_unix_socket
DBusSocket _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.
Definition dbus-sysdeps-unix.c:1170
_dbus_getpid
dbus_pid_t _dbus_getpid(void)
Gets our process ID.
Definition dbus-sysdeps-unix.c:3127
_dbus_atomic_get
dbus_int32_t _dbus_atomic_get(DBusAtomic *atomic)
Atomically get the value of an integer.
Definition dbus-sysdeps-unix.c:3233
_dbus_set_socket_nonblocking
dbus_bool_t _dbus_set_socket_nonblocking(DBusSocket fd, DBusError *error)
Sets a file descriptor to be nonblocking.
Definition dbus-sysdeps-unix.c:3797
_dbus_lookup_session_address
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.
Definition dbus-sysdeps-unix.c:4670
_dbus_connect_tcp_socket
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.
Definition dbus-sysdeps-unix.c:1449
_dbus_disable_sigpipe
void _dbus_disable_sigpipe(void)
signal (SIGPIPE, SIG_IGN);
Definition dbus-sysdeps-unix.c:3670
_dbus_check_setuid
dbus_bool_t _dbus_check_setuid(void)
NOTE: If you modify this function, please also consider making the corresponding change in GLib.
Definition dbus-sysdeps-unix.c:5002
_dbus_sleep_milliseconds
void _dbus_sleep_milliseconds(int milliseconds)
Sleeps the given number of milliseconds.
Definition dbus-sysdeps-unix.c:3542
DBUS_GID_UNSET
#define DBUS_GID_UNSET
an invalid GID used to represent an uninitialized dbus_gid_t field
Definition dbus-sysdeps.h:150
_dbus_resolve_pid_fd
dbus_pid_t _dbus_resolve_pid_fd(int pid_fd)
Resolve the PID from the PID FD, if any.
Definition dbus-sysdeps-unix.c:3045
_dbus_check_dir_is_private_to_user
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.
Definition dbus-sysdeps-unix.c:2644
_dbus_daemon_unpublish_session_bus_address
dbus_bool_t _dbus_daemon_unpublish_session_bus_address(void)
Clear the platform-specific centralized location where the session bus address is published.
Definition dbus-sysdeps-win.c:3112
_DBUS_POLLIN
#define _DBUS_POLLIN
There is data to read.
Definition dbus-sysdeps.h:444
_dbus_listen_tcp_socket
int _dbus_listen_tcp_socket(const char *host, const char *port, const char *family, DBusString *retport, const char **retfamily, DBusSocket **fds_p, DBusError *error)
Creates a socket and binds it to the given path, then listens on the socket.
Definition dbus-sysdeps-unix.c:1606
_dbus_send_credentials_socket
dbus_bool_t _dbus_send_credentials_socket(DBusSocket server_fd, DBusError *error)
Sends a single nul byte with our UNIX credentials as ancillary data.
Definition dbus-sysdeps-unix.c:2568
_dbus_getuid
dbus_uid_t _dbus_getuid(void)
Gets our UID.
Definition dbus-sysdeps-unix.c:3136
_dbus_credentials_add_from_current_process
dbus_bool_t _dbus_credentials_add_from_current_process(DBusCredentials *credentials)
Adds the most important credentials of the current process (the uid and pid) to the passed-in credent...
Definition dbus-sysdeps-unix.c:3005
_dbus_close_socket
dbus_bool_t _dbus_close_socket(DBusSocket *fd, DBusError *error)
Closes a socket and invalidates it.
Definition dbus-sysdeps-unix.c:314
_dbus_connect_unix_socket
DBusSocket _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.
Definition dbus-sysdeps-unix.c:957
_dbus_atomic_set_zero
void _dbus_atomic_set_zero(DBusAtomic *atomic)
Atomically set the value of an integer to 0.
Definition dbus-sysdeps-unix.c:3258
_dbus_atomic_inc
dbus_int32_t _dbus_atomic_inc(DBusAtomic *atomic)
Atomically increments an integer.
Definition dbus-sysdeps-unix.c:3178
_dbus_generate_random_bytes
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.
Definition dbus-sysdeps-unix.c:3572
DBUS_GID_FORMAT
#define DBUS_GID_FORMAT
an appropriate printf format for dbus_gid_t
Definition dbus-sysdeps.h:157
_dbus_printf_string_upper_bound
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.
Definition dbus-sysdeps-unix.c:3959
_dbus_delete_directory
dbus_bool_t _dbus_delete_directory(const DBusString *filename, DBusError *error)
Removes a directory; Directory must be empty.
Definition dbus-sysdeps-unix.c:4822
DBUS_UID_FORMAT
#define DBUS_UID_FORMAT
an appropriate printf format for dbus_uid_t
Definition dbus-sysdeps.h:155
_dbus_poll
int _dbus_poll(DBusPollFD *fds, int n_fds, int timeout_milliseconds)
Wrapper for poll().
Definition dbus-sysdeps-unix.c:3303
_dbus_get_autolaunch_address
dbus_bool_t _dbus_get_autolaunch_address(const char *scope, DBusString *address, DBusError *error)
Returns the address of a new session bus.
Definition dbus-sysdeps-unix.c:4299
_dbus_write_socket_two
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.
Definition dbus-sysdeps-unix.c:694
_dbus_concat_dir_and_file
dbus_bool_t _dbus_concat_dir_and_file(DBusString *dir, const DBusString *next_component)
Appends the given filename to the given directory.
Definition dbus-sysdeps-unix.c:3497
_dbus_connect_exec
DBusSocket _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.
Definition dbus-sysdeps-unix.c:1054
_dbus_print_backtrace
void _dbus_print_backtrace(void)
On GNU libc systems, print a crude backtrace to stderr.
Definition dbus-sysdeps-unix.c:3842
_dbus_get_real_time
void _dbus_get_real_time(dbus_int64_t *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
Definition dbus-sysdeps-unix.c:3412
_dbus_init_system_log
void _dbus_init_system_log(const char *tag, DBusLogFlags flags)
Initialize the system log.
Definition dbus-sysdeps-unix.c:5183
_dbus_accept
DBusSocket _dbus_accept(DBusSocket listen_fd)
Accepts a connection on a listening socket.
Definition dbus-sysdeps-unix.c:2589
_DBUS_MAX_SUN_PATH_LENGTH
#define _DBUS_MAX_SUN_PATH_LENGTH
Maximum length of the path to a UNIX domain socket, sockaddr_un::sun_path member.
Definition dbus-sysdeps.h:765
_dbus_append_user_from_current_process
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...
Definition dbus-sysdeps-unix.c:3117
_dbus_flush_caches
void _dbus_flush_caches(void)
Called when the bus daemon is signaled to reload its configuration; any caches should be nuked.
Definition dbus-sysdeps-unix.c:4702
_dbus_get_tmpdir
const char * _dbus_get_tmpdir(void)
Gets the temporary files directory by inspecting the environment variables TMPDIR,...
Definition dbus-sysdeps-unix.c:4029
DBUS_PID_FORMAT
#define DBUS_PID_FORMAT
an appropriate printf format for dbus_pid_t
Definition dbus-sysdeps.h:153
_dbus_ensure_directory
dbus_bool_t _dbus_ensure_directory(const DBusString *filename, DBusError *error)
Creates a directory; succeeds if the directory is created or already existed.
Definition dbus-sysdeps-unix.c:3434
_dbus_create_directory
dbus_bool_t _dbus_create_directory(const DBusString *filename, DBusError *error)
Creates a directory.
Definition dbus-sysdeps-unix.c:3466
dbus_uint16_t
unsigned short dbus_uint16_t
A 16-bit unsigned integer on all platforms.
Definition dbus-arch-deps.h:48
dbus_int32_t
int dbus_int32_t
A 32-bit signed integer on all platforms.
Definition dbus-arch-deps.h:44
dbus_bool_t
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition dbus-types.h:37
dbus_int64_t
_DBUS_GNUC_EXTENSION typedef long long dbus_int64_t
A 64-bit signed integer.
Definition dbus-arch-deps.h:37
DBusAtomic
An atomic integer safe to increment or decrement from multiple threads.
Definition dbus-sysdeps.h:340
DBusAtomic::value
volatile dbus_int32_t value
Value of the atomic integer.
Definition dbus-sysdeps.h:346
DBusCredentials
Definition dbus-credentials.c:60
DBusError
Object representing an exception.
Definition dbus-errors.h:51
DBusError::name
const char * name
public error name field
Definition dbus-errors.h:52
DBusError::message
const char * message
public error message field
Definition dbus-errors.h:53
DBusList
A node in a linked list.
Definition dbus-list.h:37
DBusPollFD
Definition dbus-sysdeps.h:437
DBusPollFD::events
short events
Events to poll for.
Definition dbus-sysdeps.h:439
DBusPollFD::revents
short revents
Events that occurred.
Definition dbus-sysdeps.h:440
DBusPollFD::fd
DBusPollable fd
File descriptor.
Definition dbus-sysdeps.h:438
DBusSocket
Socket interface.
Definition dbus-sysdeps.h:185
DBusString
Definition dbus-string.h:47
DBusUserInfo
Information about a UNIX user.
Definition dbus-sysdeps-unix.h:93
DBusUserInfo::n_group_ids
int n_group_ids
Size of group IDs array.
Definition dbus-sysdeps-unix.h:98
DBusUserInfo::uid
dbus_uid_t uid
UID.
Definition dbus-sysdeps-unix.h:95
DBusUserInfo::homedir
char * homedir
Home directory.
Definition dbus-sysdeps-unix.h:100
DBusUserInfo::group_ids
dbus_gid_t * group_ids
Groups IDs, including above primary group.
Definition dbus-sysdeps-unix.h:97
DBusUserInfo::username
char * username
Username.
Definition dbus-sysdeps-unix.h:99
DBusUserInfo::primary_gid
dbus_gid_t primary_gid
GID.
Definition dbus-sysdeps-unix.h:96
DBusGUID
A globally unique ID ; we have one for each DBusServer, and also one for each machine with libdbus in...
Definition dbus-internals.h:458