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 */
45 #define _DBUS_PATH_SEPARATOR ";"
47 #define _DBUS_PATH_SEPARATOR ":"
50 /* Forward declarations */
52 /** An opaque string type */
53 typedef struct DBusString DBusString;
55 /** An opaque list type */
56 typedef struct DBusList DBusList;
59 * @addtogroup DBusSysdeps
64 /* The idea of this file is to encapsulate everywhere that we're
65 * relying on external libc features, for ease of security
66 * auditing. The idea is from vsftpd. This also gives us a chance to
67 * make things more convenient to use, e.g. by reading into a
68 * DBusString. Operating system headers aren't intended to be used
69 * outside of this file and a limited number of others (such as
73 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
74 #define _DBUS_GNUC_PRINTF( format_idx, arg_idx ) \
75 __attribute__((__format__ (__printf__, format_idx, arg_idx)))
76 #define _DBUS_GNUC_NORETURN \
77 __attribute__((__noreturn__))
79 #define _DBUS_GNUC_PRINTF( format_idx, arg_idx )
80 #define _DBUS_GNUC_NORETURN
81 #endif /* !__GNUC__ */
83 /** @def _DBUS_GNUC_PRINTF
84 * used to tell gcc about printf format strings
86 /** @def _DBUS_GNUC_NORETURN
87 * used to tell gcc about functions that never return, such as _dbus_abort()
90 void _dbus_abort (void) _DBUS_GNUC_NORETURN;
92 const char* _dbus_getenv (const char *varname);
93 dbus_bool_t _dbus_setenv (const char *varname,
97 typedef unsigned long dbus_pid_t;
99 typedef unsigned long dbus_uid_t;
101 typedef unsigned long dbus_gid_t;
103 /** an invalid PID used to represent an uninitialized dbus_pid_t field */
104 #define DBUS_PID_UNSET ((dbus_pid_t) -1)
105 /** an invalid UID used to represent an uninitialized dbus_uid_t field */
106 #define DBUS_UID_UNSET ((dbus_uid_t) -1)
107 /** an invalid GID used to represent an uninitialized dbus_gid_t field */
108 #define DBUS_GID_UNSET ((dbus_gid_t) -1)
110 /** an appropriate printf format for dbus_pid_t */
111 #define DBUS_PID_FORMAT "%lu"
112 /** an appropriate printf format for dbus_uid_t */
113 #define DBUS_UID_FORMAT "%lu"
114 /** an appropriate printf format for dbus_gid_t */
115 #define DBUS_GID_FORMAT "%lu"
121 * @todo Use for the file descriptors a struct
122 * - struct DBusSocket{ int d; }; -
123 * instead of int to get type-safety which
124 * will be checked by the compiler.
128 dbus_bool_t _dbus_open_tcp_socket (int *fd,
130 dbus_bool_t _dbus_close_socket (int fd,
132 int _dbus_read_socket (int fd,
135 int _dbus_write_socket (int fd,
136 const DBusString *buffer,
139 int _dbus_write_socket_two (int fd,
140 const DBusString *buffer1,
143 const DBusString *buffer2,
146 int _dbus_connect_tcp_socket (const char *host,
149 int _dbus_listen_tcp_socket (const char *host,
152 int _dbus_accept (int listen_fd);
155 * Struct representing socket credentials
159 dbus_pid_t pid; /**< process ID or DBUS_PID_UNSET */
160 dbus_uid_t uid; /**< user ID or DBUS_UID_UNSET */
161 dbus_gid_t gid; /**< group ID or DBUS_GID_UNSET */
164 /* FIXME these read/send credentials should get moved to sysdeps-unix.h,
165 * or renamed to reflect what they mean cross-platform
167 dbus_bool_t _dbus_read_credentials_unix_socket (int client_fd,
168 DBusCredentials *credentials,
170 dbus_bool_t _dbus_send_credentials_unix_socket (int server_fd,
174 void _dbus_credentials_clear (DBusCredentials *credentials);
175 void _dbus_credentials_from_current_process (DBusCredentials *credentials);
176 dbus_bool_t _dbus_credentials_match (const DBusCredentials *expected_credentials,
177 const DBusCredentials *provided_credentials);
180 /** Information about a UNIX user */
181 typedef struct DBusUserInfo DBusUserInfo;
182 /** Information about a UNIX group */
183 typedef struct DBusGroupInfo DBusGroupInfo;
186 * Information about a UNIX user
190 dbus_uid_t uid; /**< UID */
191 dbus_gid_t primary_gid; /**< GID */
192 dbus_gid_t *group_ids; /**< Groups IDs, *including* above primary group */
193 int n_group_ids; /**< Size of group IDs array */
194 char *username; /**< Username */
195 char *homedir; /**< Home directory */
199 * Information about a UNIX group
203 dbus_gid_t gid; /**< GID */
204 char *groupname; /**< Group name */
207 dbus_bool_t _dbus_user_info_fill (DBusUserInfo *info,
208 const DBusString *username,
210 dbus_bool_t _dbus_user_info_fill_uid (DBusUserInfo *info,
213 void _dbus_user_info_free (DBusUserInfo *info);
215 dbus_bool_t _dbus_group_info_fill (DBusGroupInfo *info,
216 const DBusString *groupname,
218 dbus_bool_t _dbus_group_info_fill_gid (DBusGroupInfo *info,
221 void _dbus_group_info_free (DBusGroupInfo *info);
224 unsigned long _dbus_getpid (void);
225 dbus_uid_t _dbus_getuid (void);
226 dbus_gid_t _dbus_getgid (void);
228 /** Opaque type representing an atomically-modifiable integer
229 * that can be used from multiple threads.
231 typedef struct DBusAtomic DBusAtomic;
234 * An atomic integer safe to increment or decrement from multiple threads.
239 volatile long value; /**< Value of the atomic integer. */
241 volatile dbus_int32_t value; /**< Value of the atomic integer. */
245 dbus_int32_t _dbus_atomic_inc (DBusAtomic *atomic);
246 dbus_int32_t _dbus_atomic_dec (DBusAtomic *atomic);
248 /** There is data to read */
249 #define _DBUS_POLLIN 0x0001
250 /** There is urgent data to read */
251 #define _DBUS_POLLPRI 0x0002
252 /** Writing now will not block */
253 #define _DBUS_POLLOUT 0x0004
254 /** Error condition */
255 #define _DBUS_POLLERR 0x0008
257 #define _DBUS_POLLHUP 0x0010
258 /** Invalid request: fd not open */
259 #define _DBUS_POLLNVAL 0x0020
262 * A portable struct pollfd wrapper.
266 int fd; /**< File descriptor */
267 short events; /**< Events to poll for */
268 short revents; /**< Events that occurred */
271 int _dbus_poll (DBusPollFD *fds,
273 int timeout_milliseconds);
275 void _dbus_sleep_milliseconds (int milliseconds);
277 void _dbus_get_current_time (long *tv_sec,
281 * File/directory interface
283 dbus_bool_t _dbus_file_exists (const char *file);
284 dbus_bool_t _dbus_file_get_contents (DBusString *str,
285 const DBusString *filename,
287 dbus_bool_t _dbus_string_save_to_file (const DBusString *str,
288 const DBusString *filename,
291 dbus_bool_t _dbus_make_file_world_readable (const DBusString *filename,
294 dbus_bool_t _dbus_create_file_exclusively (const DBusString *filename,
296 dbus_bool_t _dbus_delete_file (const DBusString *filename,
298 dbus_bool_t _dbus_create_directory (const DBusString *filename,
300 dbus_bool_t _dbus_delete_directory (const DBusString *filename,
303 dbus_bool_t _dbus_concat_dir_and_file (DBusString *dir,
304 const DBusString *next_component);
305 dbus_bool_t _dbus_string_get_dirname (const DBusString *filename,
306 DBusString *dirname);
307 dbus_bool_t _dbus_path_is_absolute (const DBusString *filename);
309 dbus_bool_t _dbus_get_standard_session_servicedirs (DBusList **dirs);
315 void _dbus_pipe_init (DBusPipe *pipe,
317 void _dbus_pipe_init_stdout (DBusPipe *pipe);
318 int _dbus_pipe_write (DBusPipe *pipe,
319 const DBusString *buffer,
323 int _dbus_pipe_close (DBusPipe *pipe,
325 dbus_bool_t _dbus_pipe_is_valid (DBusPipe *pipe);
326 void _dbus_pipe_invalidate (DBusPipe *pipe);
327 dbus_bool_t _dbus_pipe_is_stdout_or_stderr (DBusPipe *pipe);
330 /** Opaque type for reading a directory listing */
331 typedef struct DBusDirIter DBusDirIter;
333 DBusDirIter* _dbus_directory_open (const DBusString *filename,
335 dbus_bool_t _dbus_directory_get_next_file (DBusDirIter *iter,
336 DBusString *filename,
338 void _dbus_directory_close (DBusDirIter *iter);
340 dbus_bool_t _dbus_check_dir_is_private_to_user (DBusString *dir,
343 void _dbus_fd_set_close_on_exec (int fd);
345 const char* _dbus_get_tmpdir (void);
350 void _dbus_generate_pseudorandom_bytes_buffer (char *buffer,
352 void _dbus_generate_random_bytes_buffer (char *buffer,
354 dbus_bool_t _dbus_generate_random_bytes (DBusString *str,
356 dbus_bool_t _dbus_generate_random_ascii (DBusString *str,
359 const char* _dbus_error_from_errno (int error_number);
361 void _dbus_disable_sigpipe (void);
364 void _dbus_exit (int code) _DBUS_GNUC_NORETURN;
366 int _dbus_printf_string_upper_bound (const char *format,
371 * Portable struct with stat() results
375 unsigned long mode; /**< File mode */
376 unsigned long nlink; /**< Number of hard links */
377 dbus_uid_t uid; /**< User owning file */
378 dbus_gid_t gid; /**< Group owning file */
379 unsigned long size; /**< Size of file */
380 unsigned long atime; /**< Access time */
381 unsigned long mtime; /**< Modify time */
382 unsigned long ctime; /**< Creation time */
385 dbus_bool_t _dbus_stat (const DBusString *filename,
388 dbus_bool_t _dbus_full_duplex_pipe (int *fd1,
390 dbus_bool_t blocking,
393 void _dbus_print_backtrace (void);
395 dbus_bool_t _dbus_become_daemon (const DBusString *pidfile,
396 DBusPipe *print_pid_pipe,
398 dbus_bool_t _dbus_write_pid_file (const DBusString *filename,
401 dbus_bool_t _dbus_change_identity (unsigned long uid,
405 /** A UNIX signal handler */
406 typedef void (* DBusSignalHandler) (int sig);
408 void _dbus_set_signal_handler (int sig,
409 DBusSignalHandler handler);
411 dbus_bool_t _dbus_user_at_console (const char *username,
414 /* Define DBUS_VA_COPY() to do the right thing for copying va_list variables.
415 * config.h may have already defined DBUS_VA_COPY as va_copy or __va_copy.
417 #if !defined (DBUS_VA_COPY)
418 # if defined (__GNUC__) && defined (__PPC__) && (defined (_CALL_SYSV) || defined (_WIN32))
419 # define DBUS_VA_COPY(ap1, ap2) (*(ap1) = *(ap2))
420 # elif defined (DBUS_VA_COPY_AS_ARRAY)
421 # define DBUS_VA_COPY(ap1, ap2) memcpy ((ap1), (ap2), sizeof (va_list))
422 # else /* va_list is a pointer */
423 # define DBUS_VA_COPY(ap1, ap2) ((ap1) = (ap2))
424 # endif /* va_list is a pointer */
425 #endif /* !DBUS_VA_COPY */
429 * Casts a primitive C type to a byte array and then indexes
430 * a particular byte of the array.
432 #define _DBUS_BYTE_OF_PRIMITIVE(p, i) \
433 (((const char*)&(p))[(i)])
434 /** On x86 there is an 80-bit FPU, and if you do "a == b" it may have a
435 * or b in an 80-bit register, thus failing to compare the two 64-bit
436 * doubles for bitwise equality. So this macro compares the two doubles
439 #define _DBUS_DOUBLES_BITWISE_EQUAL(a, b) \
440 (_DBUS_BYTE_OF_PRIMITIVE (a, 0) == _DBUS_BYTE_OF_PRIMITIVE (b, 0) && \
441 _DBUS_BYTE_OF_PRIMITIVE (a, 1) == _DBUS_BYTE_OF_PRIMITIVE (b, 1) && \
442 _DBUS_BYTE_OF_PRIMITIVE (a, 2) == _DBUS_BYTE_OF_PRIMITIVE (b, 2) && \
443 _DBUS_BYTE_OF_PRIMITIVE (a, 3) == _DBUS_BYTE_OF_PRIMITIVE (b, 3) && \
444 _DBUS_BYTE_OF_PRIMITIVE (a, 4) == _DBUS_BYTE_OF_PRIMITIVE (b, 4) && \
445 _DBUS_BYTE_OF_PRIMITIVE (a, 5) == _DBUS_BYTE_OF_PRIMITIVE (b, 5) && \
446 _DBUS_BYTE_OF_PRIMITIVE (a, 6) == _DBUS_BYTE_OF_PRIMITIVE (b, 6) && \
447 _DBUS_BYTE_OF_PRIMITIVE (a, 7) == _DBUS_BYTE_OF_PRIMITIVE (b, 7))
449 dbus_bool_t _dbus_parse_uid (const DBusString *uid_str,
452 dbus_bool_t _dbus_get_autolaunch_address (DBusString *address,
455 /** Type representing a universally unique ID
456 * @todo rename to UUID instead of GUID
458 typedef union DBusGUID DBusGUID;
460 dbus_bool_t _dbus_read_local_machine_uuid (DBusGUID *machine_id,
461 dbus_bool_t create_if_not_found,
465 * Initialize threads as in dbus_threads_init_default(), appropriately
467 * @returns #FALSE if no memory
469 dbus_bool_t _dbus_threads_init_platform_specific (void);
471 dbus_bool_t _dbus_split_paths_and_append (DBusString *dirs,
473 DBusList **dir_list);
479 #endif /* DBUS_SYSDEPS_H */