1 /* -*- mode: C; c-file-style: "gnu" -*- */
2 /* dbus-sysdeps.h Wrappers around system/libc features (internal to D-Bus implementation)
4 * Copyright (C) 2002, 2003 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #ifndef DBUS_SYSDEPS_H
26 #define DBUS_SYSDEPS_H
30 #include <dbus/dbus-errors.h>
32 /* this is perhaps bogus, but strcmp() etc. are faster if we use the
33 * stuff straight out of string.h, so have this here for now.
37 /* and it would just be annoying to abstract this */
44 /* Forward declarations */
46 /** An opaque string type */
47 typedef struct DBusString DBusString;
49 /** An opaque list type */
50 typedef struct DBusList DBusList;
53 * @addtogroup DBusSysdeps
58 /* The idea of this file is to encapsulate everywhere that we're
59 * relying on external libc features, for ease of security
60 * auditing. The idea is from vsftpd. This also gives us a chance to
61 * make things more convenient to use, e.g. by reading into a
62 * DBusString. Operating system headers aren't intended to be used
63 * outside of this file and a limited number of others (such as
67 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
68 #define _DBUS_GNUC_PRINTF( format_idx, arg_idx ) \
69 __attribute__((__format__ (__printf__, format_idx, arg_idx)))
70 #define _DBUS_GNUC_NORETURN \
71 __attribute__((__noreturn__))
73 #define _DBUS_GNUC_PRINTF( format_idx, arg_idx )
74 #define _DBUS_GNUC_NORETURN
75 #endif /* !__GNUC__ */
77 /** @def _DBUS_GNUC_PRINTF
78 * used to tell gcc about printf format strings
80 /** @def _DBUS_GNUC_NORETURN
81 * used to tell gcc about functions that never return, such as _dbus_abort()
84 void _dbus_abort (void) _DBUS_GNUC_NORETURN;
86 const char* _dbus_getenv (const char *varname);
87 dbus_bool_t _dbus_setenv (const char *varname,
91 typedef unsigned long dbus_pid_t;
93 typedef unsigned long dbus_uid_t;
95 typedef unsigned long dbus_gid_t;
97 /** an invalid PID used to represent an uninitialized dbus_pid_t field */
98 #define DBUS_PID_UNSET ((dbus_pid_t) -1)
99 /** an invalid UID used to represent an uninitialized dbus_uid_t field */
100 #define DBUS_UID_UNSET ((dbus_uid_t) -1)
101 /** an invalid GID used to represent an uninitialized dbus_gid_t field */
102 #define DBUS_GID_UNSET ((dbus_gid_t) -1)
104 /** an appropriate printf format for dbus_pid_t */
105 #define DBUS_PID_FORMAT "%lu"
106 /** an appropriate printf format for dbus_uid_t */
107 #define DBUS_UID_FORMAT "%lu"
108 /** an appropriate printf format for dbus_gid_t */
109 #define DBUS_GID_FORMAT "%lu"
115 * @todo Use for the file descriptors a struct
116 * - struct DBusSocket{ int d; }; -
117 * instead of int to get type-safety which
118 * will be checked by the compiler.
122 dbus_bool_t _dbus_open_tcp_socket (int *fd,
124 dbus_bool_t _dbus_close_socket (int fd,
126 int _dbus_read_socket (int fd,
129 int _dbus_write_socket (int fd,
130 const DBusString *buffer,
133 int _dbus_write_socket_two (int fd,
134 const DBusString *buffer1,
137 const DBusString *buffer2,
140 int _dbus_connect_tcp_socket (const char *host,
143 int _dbus_listen_tcp_socket (const char *host,
146 int _dbus_accept (int listen_fd);
149 * Struct representing socket credentials
153 dbus_pid_t pid; /**< process ID or DBUS_PID_UNSET */
154 dbus_uid_t uid; /**< user ID or DBUS_UID_UNSET */
155 dbus_gid_t gid; /**< group ID or DBUS_GID_UNSET */
158 /* FIXME these read/send credentials should get moved to sysdeps-unix.h,
159 * or renamed to reflect what they mean cross-platform
161 dbus_bool_t _dbus_read_credentials_unix_socket (int client_fd,
162 DBusCredentials *credentials,
164 dbus_bool_t _dbus_send_credentials_unix_socket (int server_fd,
168 void _dbus_credentials_clear (DBusCredentials *credentials);
169 void _dbus_credentials_from_current_process (DBusCredentials *credentials);
170 dbus_bool_t _dbus_credentials_match (const DBusCredentials *expected_credentials,
171 const DBusCredentials *provided_credentials);
174 /** Information about a UNIX user */
175 typedef struct DBusUserInfo DBusUserInfo;
176 /** Information about a UNIX group */
177 typedef struct DBusGroupInfo DBusGroupInfo;
180 * Information about a UNIX user
184 dbus_uid_t uid; /**< UID */
185 dbus_gid_t primary_gid; /**< GID */
186 dbus_gid_t *group_ids; /**< Groups IDs, *including* above primary group */
187 int n_group_ids; /**< Size of group IDs array */
188 char *username; /**< Username */
189 char *homedir; /**< Home directory */
193 * Information about a UNIX group
197 dbus_gid_t gid; /**< GID */
198 char *groupname; /**< Group name */
201 dbus_bool_t _dbus_user_info_fill (DBusUserInfo *info,
202 const DBusString *username,
204 dbus_bool_t _dbus_user_info_fill_uid (DBusUserInfo *info,
207 void _dbus_user_info_free (DBusUserInfo *info);
209 dbus_bool_t _dbus_group_info_fill (DBusGroupInfo *info,
210 const DBusString *groupname,
212 dbus_bool_t _dbus_group_info_fill_gid (DBusGroupInfo *info,
215 void _dbus_group_info_free (DBusGroupInfo *info);
218 unsigned long _dbus_getpid (void);
219 dbus_uid_t _dbus_getuid (void);
220 dbus_gid_t _dbus_getgid (void);
222 /** Opaque type representing an atomically-modifiable integer
223 * that can be used from multiple threads.
225 typedef struct DBusAtomic DBusAtomic;
228 * An atomic integer safe to increment or decrement from multiple threads.
233 volatile long value; /**< Value of the atomic integer. */
235 volatile dbus_int32_t value; /**< Value of the atomic integer. */
239 dbus_int32_t _dbus_atomic_inc (DBusAtomic *atomic);
240 dbus_int32_t _dbus_atomic_dec (DBusAtomic *atomic);
242 /** There is data to read */
243 #define _DBUS_POLLIN 0x0001
244 /** There is urgent data to read */
245 #define _DBUS_POLLPRI 0x0002
246 /** Writing now will not block */
247 #define _DBUS_POLLOUT 0x0004
248 /** Error condition */
249 #define _DBUS_POLLERR 0x0008
251 #define _DBUS_POLLHUP 0x0010
252 /** Invalid request: fd not open */
253 #define _DBUS_POLLNVAL 0x0020
256 * A portable struct pollfd wrapper.
260 int fd; /**< File descriptor */
261 short events; /**< Events to poll for */
262 short revents; /**< Events that occurred */
265 int _dbus_poll (DBusPollFD *fds,
267 int timeout_milliseconds);
269 void _dbus_sleep_milliseconds (int milliseconds);
271 void _dbus_get_current_time (long *tv_sec,
275 * File/directory interface
277 dbus_bool_t _dbus_file_exists (const char *file);
278 dbus_bool_t _dbus_file_get_contents (DBusString *str,
279 const DBusString *filename,
281 dbus_bool_t _dbus_string_save_to_file (const DBusString *str,
282 const DBusString *filename,
285 dbus_bool_t _dbus_make_file_world_readable (const DBusString *filename,
288 dbus_bool_t _dbus_create_file_exclusively (const DBusString *filename,
290 dbus_bool_t _dbus_delete_file (const DBusString *filename,
292 dbus_bool_t _dbus_create_directory (const DBusString *filename,
294 dbus_bool_t _dbus_delete_directory (const DBusString *filename,
297 dbus_bool_t _dbus_concat_dir_and_file (DBusString *dir,
298 const DBusString *next_component);
299 dbus_bool_t _dbus_string_get_dirname (const DBusString *filename,
300 DBusString *dirname);
301 dbus_bool_t _dbus_path_is_absolute (const DBusString *filename);
303 dbus_bool_t _dbus_get_standard_session_servicedirs (DBusList **dirs);
309 void _dbus_pipe_init (DBusPipe *pipe,
311 void _dbus_pipe_init_stdout (DBusPipe *pipe);
312 int _dbus_pipe_write (DBusPipe *pipe,
313 const DBusString *buffer,
317 int _dbus_pipe_close (DBusPipe *pipe,
319 dbus_bool_t _dbus_pipe_is_valid (DBusPipe *pipe);
320 void _dbus_pipe_invalidate (DBusPipe *pipe);
321 dbus_bool_t _dbus_pipe_is_stdout_or_stderr (DBusPipe *pipe);
324 /** Opaque type for reading a directory listing */
325 typedef struct DBusDirIter DBusDirIter;
327 DBusDirIter* _dbus_directory_open (const DBusString *filename,
329 dbus_bool_t _dbus_directory_get_next_file (DBusDirIter *iter,
330 DBusString *filename,
332 void _dbus_directory_close (DBusDirIter *iter);
334 dbus_bool_t _dbus_check_dir_is_private_to_user (DBusString *dir,
337 void _dbus_fd_set_close_on_exec (int fd);
339 const char* _dbus_get_tmpdir (void);
344 void _dbus_generate_pseudorandom_bytes_buffer (char *buffer,
346 void _dbus_generate_random_bytes_buffer (char *buffer,
348 dbus_bool_t _dbus_generate_random_bytes (DBusString *str,
350 dbus_bool_t _dbus_generate_random_ascii (DBusString *str,
353 const char* _dbus_error_from_errno (int error_number);
355 void _dbus_disable_sigpipe (void);
358 void _dbus_exit (int code) _DBUS_GNUC_NORETURN;
360 int _dbus_printf_string_upper_bound (const char *format,
365 * Portable struct with stat() results
369 unsigned long mode; /**< File mode */
370 unsigned long nlink; /**< Number of hard links */
371 dbus_uid_t uid; /**< User owning file */
372 dbus_gid_t gid; /**< Group owning file */
373 unsigned long size; /**< Size of file */
374 unsigned long atime; /**< Access time */
375 unsigned long mtime; /**< Modify time */
376 unsigned long ctime; /**< Creation time */
379 dbus_bool_t _dbus_stat (const DBusString *filename,
382 dbus_bool_t _dbus_full_duplex_pipe (int *fd1,
384 dbus_bool_t blocking,
387 void _dbus_print_backtrace (void);
389 dbus_bool_t _dbus_become_daemon (const DBusString *pidfile,
390 DBusPipe *print_pid_pipe,
392 dbus_bool_t _dbus_write_pid_file (const DBusString *filename,
395 dbus_bool_t _dbus_change_identity (unsigned long uid,
399 /** A UNIX signal handler */
400 typedef void (* DBusSignalHandler) (int sig);
402 void _dbus_set_signal_handler (int sig,
403 DBusSignalHandler handler);
405 dbus_bool_t _dbus_user_at_console (const char *username,
408 /* Define DBUS_VA_COPY() to do the right thing for copying va_list variables.
409 * config.h may have already defined DBUS_VA_COPY as va_copy or __va_copy.
411 #if !defined (DBUS_VA_COPY)
412 # if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
413 # define DBUS_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
414 # elif defined (DBUS_VA_COPY_AS_ARRAY)
415 # define DBUS_VA_COPY(ap1, ap2) memcpy ((ap1), (ap2), sizeof (va_list))
416 # else /* va_list is a pointer */
417 # define DBUS_VA_COPY(ap1, ap2) ((ap1) = (ap2))
418 # endif /* va_list is a pointer */
419 #endif /* !DBUS_VA_COPY */
423 * Casts a primitive C type to a byte array and then indexes
424 * a particular byte of the array.
426 #define _DBUS_BYTE_OF_PRIMITIVE(p, i) \
427 (((const char*)&(p))[(i)])
428 /** On x86 there is an 80-bit FPU, and if you do "a == b" it may have a
429 * or b in an 80-bit register, thus failing to compare the two 64-bit
430 * doubles for bitwise equality. So this macro compares the two doubles
433 #define _DBUS_DOUBLES_BITWISE_EQUAL(a, b) \
434 (_DBUS_BYTE_OF_PRIMITIVE (a, 0) == _DBUS_BYTE_OF_PRIMITIVE (b, 0) && \
435 _DBUS_BYTE_OF_PRIMITIVE (a, 1) == _DBUS_BYTE_OF_PRIMITIVE (b, 1) && \
436 _DBUS_BYTE_OF_PRIMITIVE (a, 2) == _DBUS_BYTE_OF_PRIMITIVE (b, 2) && \
437 _DBUS_BYTE_OF_PRIMITIVE (a, 3) == _DBUS_BYTE_OF_PRIMITIVE (b, 3) && \
438 _DBUS_BYTE_OF_PRIMITIVE (a, 4) == _DBUS_BYTE_OF_PRIMITIVE (b, 4) && \
439 _DBUS_BYTE_OF_PRIMITIVE (a, 5) == _DBUS_BYTE_OF_PRIMITIVE (b, 5) && \
440 _DBUS_BYTE_OF_PRIMITIVE (a, 6) == _DBUS_BYTE_OF_PRIMITIVE (b, 6) && \
441 _DBUS_BYTE_OF_PRIMITIVE (a, 7) == _DBUS_BYTE_OF_PRIMITIVE (b, 7))
443 dbus_bool_t _dbus_parse_uid (const DBusString *uid_str,
446 dbus_bool_t _dbus_get_autolaunch_address (DBusString *address,
449 /** Type representing a universally unique ID
450 * @todo rename to UUID instead of GUID
452 typedef union DBusGUID DBusGUID;
454 dbus_bool_t _dbus_read_local_machine_uuid (DBusGUID *machine_id,
455 dbus_bool_t create_if_not_found,
459 * Initialize threads as in dbus_threads_init_default(), appropriately
461 * @returns #FALSE if no memory
463 dbus_bool_t _dbus_threads_init_platform_specific (void);
469 #endif /* DBUS_SYSDEPS_H */