1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-sysdeps.c Wrappers around system/libc features shared between UNIX and Windows (internal to D-Bus implementation)
4 * Copyright (C) 2002, 2003, 2006 Red Hat, Inc.
5 * Copyright (C) 2003 CodeFactory AB
7 * Licensed under the Academic Free License version 2.1
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 #include "dbus-internals.h"
27 #include "dbus-sysdeps.h"
28 #include "dbus-threads.h"
29 #include "dbus-protocol.h"
30 #include "dbus-string.h"
31 #include "dbus-list.h"
33 /* NOTE: If you include any unix/windows-specific headers here, you are probably doing something
34 * wrong and should be putting some code in dbus-sysdeps-unix.c or dbus-sysdeps-win.c.
36 * These are the standard ANSI C headers...
49 _DBUS_DEFINE_GLOBAL_LOCK (win_fds);
50 _DBUS_DEFINE_GLOBAL_LOCK (sid_atom_cache);
51 _DBUS_DEFINE_GLOBAL_LOCK (system_users);
55 #elif (defined __APPLE__)
56 # include <crt_externs.h>
57 # define environ (*_NSGetEnviron())
59 extern char **environ;
63 * @defgroup DBusSysdeps Internal system-dependent API
64 * @ingroup DBusInternals
65 * @brief Internal system-dependent API available on UNIX and Windows
67 * The system-dependent API has a dual purpose. First, it encapsulates
68 * all usage of operating system APIs for ease of auditing and to
69 * avoid cluttering the rest of the code with bizarre OS quirks and
70 * headers. Second, it abstracts different operating system APIs for
77 * Aborts the program with SIGABRT (dumping core).
84 _dbus_print_backtrace ();
86 s = _dbus_getenv ("DBUS_BLOCK_ON_ABORT");
89 /* don't use _dbus_warn here since it can _dbus_abort() */
90 fprintf (stderr, " Process %lu sleeping for gdb attach\n", _dbus_pid_for_log ());
91 _dbus_sleep_milliseconds (1000 * 180);
95 _dbus_exit (1); /* in case someone manages to ignore SIGABRT ? */
99 * Wrapper for setenv(). If the value is #NULL, unsets
100 * the environment variable.
102 * There is an unfixable memleak in that it is unsafe to
103 * free memory malloced for use with setenv. This is because
104 * we can not rely on internal implementation details of
105 * the underlying libc library.
107 * @param varname name of environment variable
108 * @param value value of environment variable
109 * @returns #TRUE on success.
112 _dbus_setenv (const char *varname,
115 _dbus_assert (varname != NULL);
126 len = strlen (varname);
128 /* Use system malloc to avoid memleaks that dbus_malloc
129 * will get upset about.
132 putenv_value = malloc (len + 2);
133 if (putenv_value == NULL)
136 strcpy (putenv_value, varname);
137 #if defined(DBUS_WIN)
138 strcat (putenv_value, "=");
141 return (putenv (putenv_value) == 0);
147 return (setenv (varname, value, TRUE) == 0);
154 varname_len = strlen (varname);
155 value_len = strlen (value);
157 len = varname_len + value_len + 1 /* '=' */ ;
159 /* Use system malloc to avoid memleaks that dbus_malloc
160 * will get upset about.
163 putenv_value = malloc (len + 1);
164 if (putenv_value == NULL)
167 strcpy (putenv_value, varname);
168 strcpy (putenv_value + varname_len, "=");
169 strcpy (putenv_value + varname_len + 1, value);
171 return (putenv (putenv_value) == 0);
177 * Wrapper for getenv().
179 * @param varname name of environment variable
180 * @returns value of environment variable or #NULL if unset
183 _dbus_getenv (const char *varname)
185 /* Don't respect any environment variables if the current process is
186 * setuid. This is the equivalent of glibc's __secure_getenv().
188 if (_dbus_check_setuid ())
190 return getenv (varname);
194 * Wrapper for clearenv().
196 * @returns #TRUE on success.
199 _dbus_clearenv (void)
201 dbus_bool_t rc = TRUE;
204 if (clearenv () != 0)
216 * Split paths into a list of char strings
218 * @param dirs string with pathes
219 * @param suffix string concated to each path in dirs
220 * @param dir_list contains a list of splitted pathes
221 * return #TRUE is pathes could be splittes,#FALSE in oom case
224 _dbus_split_paths_and_append (DBusString *dirs,
232 DBusString file_suffix;
237 _dbus_string_init_const (&file_suffix, suffix);
239 len = _dbus_string_get_length (dirs);
241 while (_dbus_string_find (dirs, start, _DBUS_PATH_SEPARATOR, &i))
245 if (!_dbus_string_init (&path))
248 if (!_dbus_string_copy_len (dirs,
254 _dbus_string_free (&path);
258 _dbus_string_chop_white (&path);
260 /* check for an empty path */
261 if (_dbus_string_get_length (&path) == 0)
264 if (!_dbus_concat_dir_and_file (&path,
267 _dbus_string_free (&path);
271 if (!_dbus_string_copy_data(&path, &cpath))
273 _dbus_string_free (&path);
277 if (!_dbus_list_append (dir_list, cpath))
279 _dbus_string_free (&path);
285 _dbus_string_free (&path);
293 if (!_dbus_string_init (&path))
296 if (!_dbus_string_copy_len (dirs,
302 _dbus_string_free (&path);
306 if (!_dbus_concat_dir_and_file (&path,
309 _dbus_string_free (&path);
313 if (!_dbus_string_copy_data(&path, &cpath))
315 _dbus_string_free (&path);
319 if (!_dbus_list_append (dir_list, cpath))
321 _dbus_string_free (&path);
326 _dbus_string_free (&path);
332 _dbus_list_foreach (dir_list, (DBusForeachFunction)dbus_free, NULL);
333 _dbus_list_clear (dir_list);
340 * @addtogroup DBusString
345 * Appends an integer to a DBusString.
347 * @param str the string
348 * @param value the integer value
349 * @returns #FALSE if not enough memory or other failure.
352 _dbus_string_append_int (DBusString *str,
355 /* this calculation is from comp.lang.c faq */
356 #define MAX_LONG_LEN ((sizeof (long) * 8 + 2) / 3 + 1) /* +1 for '-' */
361 orig_len = _dbus_string_get_length (str);
363 if (!_dbus_string_lengthen (str, MAX_LONG_LEN))
366 buf = _dbus_string_get_data_len (str, orig_len, MAX_LONG_LEN);
368 snprintf (buf, MAX_LONG_LEN, "%ld", value);
377 _dbus_string_shorten (str, MAX_LONG_LEN - i);
383 * Appends an unsigned integer to a DBusString.
385 * @param str the string
386 * @param value the integer value
387 * @returns #FALSE if not enough memory or other failure.
390 _dbus_string_append_uint (DBusString *str,
393 /* this is wrong, but definitely on the high side. */
394 #define MAX_ULONG_LEN (MAX_LONG_LEN * 2)
399 orig_len = _dbus_string_get_length (str);
401 if (!_dbus_string_lengthen (str, MAX_ULONG_LEN))
404 buf = _dbus_string_get_data_len (str, orig_len, MAX_ULONG_LEN);
406 snprintf (buf, MAX_ULONG_LEN, "%lu", value);
415 _dbus_string_shorten (str, MAX_ULONG_LEN - i);
421 * Parses an integer contained in a DBusString. Either return parameter
422 * may be #NULL if you aren't interested in it. The integer is parsed
423 * and stored in value_return. Return parameters are not initialized
424 * if the function returns #FALSE.
426 * @param str the string
427 * @param start the byte index of the start of the integer
428 * @param value_return return location of the integer value or #NULL
429 * @param end_return return location of the end of the integer, or #NULL
430 * @returns #TRUE on success
433 _dbus_string_parse_int (const DBusString *str,
442 p = _dbus_string_get_const_data_len (str, start,
443 _dbus_string_get_length (str) - start);
446 _dbus_set_errno_to_zero ();
447 v = strtol (p, &end, 0);
448 if (end == NULL || end == p || errno != 0)
454 *end_return = start + (end - p);
460 * Parses an unsigned integer contained in a DBusString. Either return
461 * parameter may be #NULL if you aren't interested in it. The integer
462 * is parsed and stored in value_return. Return parameters are not
463 * initialized if the function returns #FALSE.
465 * @param str the string
466 * @param start the byte index of the start of the integer
467 * @param value_return return location of the integer value or #NULL
468 * @param end_return return location of the end of the integer, or #NULL
469 * @returns #TRUE on success
472 _dbus_string_parse_uint (const DBusString *str,
474 unsigned long *value_return,
481 p = _dbus_string_get_const_data_len (str, start,
482 _dbus_string_get_length (str) - start);
485 _dbus_set_errno_to_zero ();
486 v = strtoul (p, &end, 0);
487 if (end == NULL || end == p || errno != 0)
493 *end_return = start + (end - p);
498 /** @} */ /* DBusString group */
501 * @addtogroup DBusInternalsUtils
506 _dbus_generate_pseudorandom_bytes_buffer (char *buffer,
512 /* fall back to pseudorandom */
513 _dbus_verbose ("Falling back to pseudorandom for %d bytes\n",
516 _dbus_get_real_time (NULL, &tv_usec);
526 b = (r / (double) RAND_MAX) * 255.0;
535 * Fills n_bytes of the given buffer with random bytes.
537 * @param buffer an allocated buffer
538 * @param n_bytes the number of bytes in buffer to write to
541 _dbus_generate_random_bytes_buffer (char *buffer,
546 if (!_dbus_string_init (&str))
548 _dbus_generate_pseudorandom_bytes_buffer (buffer, n_bytes);
552 if (!_dbus_generate_random_bytes (&str, n_bytes))
554 _dbus_string_free (&str);
555 _dbus_generate_pseudorandom_bytes_buffer (buffer, n_bytes);
559 _dbus_string_copy_to_buffer (&str, buffer, n_bytes);
561 _dbus_string_free (&str);
565 * Generates the given number of random bytes, where the bytes are
566 * chosen from the alphanumeric ASCII subset.
568 * @param str the string
569 * @param n_bytes the number of random ASCII bytes to append to string
570 * @returns #TRUE on success, #FALSE if no memory or other failure
573 _dbus_generate_random_ascii (DBusString *str,
576 static const char letters[] =
577 "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz";
581 if (!_dbus_generate_random_bytes (str, n_bytes))
584 len = _dbus_string_get_length (str);
588 _dbus_string_set_byte (str, i,
589 letters[_dbus_string_get_byte (str, i) %
590 (sizeof (letters) - 1)]);
595 _dbus_assert (_dbus_string_validate_ascii (str, len - n_bytes,
602 * Converts a UNIX errno, or Windows errno or WinSock error value into
605 * @todo should cover more errnos, specifically those
608 * @param error_number the errno.
609 * @returns an error name
612 _dbus_error_from_errno (int error_number)
614 switch (error_number)
617 return DBUS_ERROR_FAILED;
619 #ifdef EPROTONOSUPPORT
620 case EPROTONOSUPPORT:
621 return DBUS_ERROR_NOT_SUPPORTED;
622 #elif defined(WSAEPROTONOSUPPORT)
623 case WSAEPROTONOSUPPORT:
624 return DBUS_ERROR_NOT_SUPPORTED;
628 return DBUS_ERROR_NOT_SUPPORTED;
629 #elif defined(WSAEAFNOSUPPORT)
630 case WSAEAFNOSUPPORT:
631 return DBUS_ERROR_NOT_SUPPORTED;
635 return DBUS_ERROR_LIMITS_EXCEEDED; /* kernel out of memory */
639 return DBUS_ERROR_LIMITS_EXCEEDED;
643 return DBUS_ERROR_ACCESS_DENIED;
647 return DBUS_ERROR_ACCESS_DENIED;
651 return DBUS_ERROR_NO_MEMORY;
655 return DBUS_ERROR_NO_MEMORY;
659 return DBUS_ERROR_NO_SERVER;
660 #elif defined(WSAECONNREFUSED)
661 case WSAECONNREFUSED:
662 return DBUS_ERROR_NO_SERVER;
666 return DBUS_ERROR_TIMEOUT;
667 #elif defined(WSAETIMEDOUT)
669 return DBUS_ERROR_TIMEOUT;
673 return DBUS_ERROR_NO_NETWORK;
674 #elif defined(WSAENETUNREACH)
676 return DBUS_ERROR_NO_NETWORK;
680 return DBUS_ERROR_ADDRESS_IN_USE;
681 #elif defined(WSAEADDRINUSE)
683 return DBUS_ERROR_ADDRESS_IN_USE;
687 return DBUS_ERROR_FILE_EXISTS;
691 return DBUS_ERROR_FILE_NOT_FOUND;
695 return DBUS_ERROR_FAILED;
699 * Converts the current system errno value into a #DBusError name.
701 * @returns an error name
704 _dbus_error_from_system_errno (void)
706 return _dbus_error_from_errno (errno);
710 * Assign 0 to the global errno variable
713 _dbus_set_errno_to_zero (void)
723 * See if errno is set
724 * @returns #TRUE if errno is not 0
727 _dbus_get_is_errno_nonzero (void)
733 * See if errno is ENOMEM
734 * @returns #TRUE if errno == ENOMEM
737 _dbus_get_is_errno_enomem (void)
739 return errno == ENOMEM;
743 * See if errno is EINTR
744 * @returns #TRUE if errno == EINTR
747 _dbus_get_is_errno_eintr (void)
749 return errno == EINTR;
753 * See if errno is EPIPE
754 * @returns #TRUE if errno == EPIPE
757 _dbus_get_is_errno_epipe (void)
759 return errno == EPIPE;
763 * Get error message from errno
764 * @returns _dbus_strerror(errno)
767 _dbus_strerror_from_errno (void)
769 return _dbus_strerror (errno);
772 /** @} end of sysdeps */
774 /* tests in dbus-sysdeps-util.c */