2 Unix SMB/CIFS implementation.
3 Utility functions for Samba
4 Copyright (C) Andrew Tridgell 1992-1999
5 Copyright (C) Jelmer Vernooij 2005
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #ifndef _SAMBA_UTIL_H_
22 #define _SAMBA_UTIL_H_
24 #ifndef SAMBA_UTIL_CORE_ONLY
25 #include "lib/util/charset/charset.h"
27 #include "charset_compat.h"
30 #include "lib/util/attr.h"
40 * @brief Helpful macros
45 extern const char *panic_action;
47 #include "lib/util/time.h"
48 #include "lib/util/data_blob.h"
49 #include "lib/util/xfile.h"
50 #include "lib/util/byteorder.h"
51 #include "lib/util/talloc_stack.h"
54 #define ABS(a) ((a)>0?(a):(-(a)))
57 #include "lib/util/memory.h"
59 #include "../libcli/util/ntstatus.h"
60 #include "lib/util/string_wrappers.h"
64 #include "lib/util/util.h"
67 * Write backtrace to debug log
69 _PUBLIC_ void call_backtrace(void);
71 _PUBLIC_ void dump_core_setup(const char *progname, const char *logfile);
74 register a fault handler.
75 Should only be called once in the execution of smbd.
77 _PUBLIC_ bool register_fault_handler(const char *name, void (*fault_handler)(int sig));
79 #include "lib/util/signal.h" /* Avoid /usr/include/signal.h */
83 _PUBLIC_ int sys_getnameinfo(const struct sockaddr *psa,
91 /* The following definitions come from lib/util/genrand.c */
93 #include "lib/util/genrand.h"
96 generate a single random uint32_t
98 _PUBLIC_ uint32_t generate_random(void);
101 very basic password quality checker
103 _PUBLIC_ bool check_password_quality(const char *s);
106 * Generate a random text password.
108 _PUBLIC_ char *generate_random_password(TALLOC_CTX *mem_ctx, size_t min, size_t max);
111 Use the random number generator to generate a random string.
113 _PUBLIC_ char *generate_random_str_list(TALLOC_CTX *mem_ctx, size_t len, const char *list);
116 * Generate a random text string consisting of the specified length.
117 * The returned string will be allocated.
119 * Characters used are: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_-#.,
121 _PUBLIC_ char *generate_random_str(TALLOC_CTX *mem_ctx, size_t len);
124 * Generate an array of unique text strings all of the same length.
125 * The returned strings will be allocated.
126 * Returns NULL if the number of unique combinations cannot be created.
128 * Characters used are: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_-#.,
130 _PUBLIC_ char** generate_unique_strs(TALLOC_CTX *mem_ctx, size_t len,
133 /* The following definitions come from lib/util/dprintf.c */
135 _PUBLIC_ int d_fprintf(FILE *f, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
136 _PUBLIC_ int d_printf(const char *format, ...) PRINTF_ATTRIBUTE(1,2);
137 _PUBLIC_ void display_set_stderr(void);
139 /* The following definitions come from lib/util/util_str.c */
141 bool next_token_talloc(TALLOC_CTX *ctx,
147 * Get the next token from a string, return false if none found. Handles
148 * double-quotes. This version does not trim leading separator characters
149 * before looking for a token.
151 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
158 Trim the specified elements off the front and back of a string.
160 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back);
163 Find the number of 'c' chars in a string
165 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c);
168 Routine to get hex characters and turn them into a 16 byte array.
169 the array can be variable length, and any non-hex-numeric
170 characters are skipped. "0xnn" or "0Xnn" is specially catered
173 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
177 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len);
180 * Parse a hex string and return a data blob.
182 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex) ;
185 * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
187 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen);
190 * talloc version of hex_encode_buf()
192 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len);
194 #include "substitute.h"
197 Unescape a URL encoded string, in place.
199 _PUBLIC_ void rfc1738_unescape(char *buf);
204 * Returns a static buffer that contains the RFC
205 * 1738 compliant, escaped version of the given url. (escapes unsafe and % characters)
207 _PUBLIC_ char *rfc1738_escape(TALLOC_CTX *mem_ctx, const char *url);
210 * rfc1738_escape_unescaped
212 * Returns a static buffer that contains
213 * the RFC 1738 compliant, escaped version of the given url (escapes unsafe chars only)
215 _PUBLIC_ char *rfc1738_escape_unescaped(TALLOC_CTX *mem_ctx, const char *url);
218 * rfc1738_escape_part
219 * Returns a static buffer that contains the RFC
220 * 1738 compliant, escaped version of the given url segment. (escapes
221 * unsafe, reserved and % chars) It would mangle the :// in http://,
222 * and mangle paths (because of /).
224 _PUBLIC_ char *rfc1738_escape_part(TALLOC_CTX *mem_ctx, const char *url);
227 varient of strcmp() that handles NULL ptrs
229 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2);
232 return the number of bytes occupied by a buffer in ASCII format
233 the result includes the null termination
236 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n);
239 Set a boolean variable from the text value stored in the passed string.
240 Returns true in success, false if the passed string does not correctly
243 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean);
246 * Parse a string containing a boolean value.
248 * val will be set to the read value.
250 * @retval true if a boolean value was parsed, false otherwise.
252 _PUBLIC_ bool conv_str_bool(const char * str, bool * val);
255 * Convert a size specification like 16K into an integral number of bytes.
257 _PUBLIC_ bool conv_str_size_error(const char * str, uint64_t * val);
260 * Parse a uint64_t value from a string
262 * val will be set to the value read.
264 * @retval true if parsing was successful, false otherwise
266 _PUBLIC_ bool conv_str_u64(const char * str, uint64_t * val);
269 return the number of bytes occupied by a buffer in CH_UTF16 format
270 the result includes the null termination
272 _PUBLIC_ size_t utf16_len(const void *buf);
275 return the number of bytes occupied by a buffer in CH_UTF16 format
276 the result includes the null termination
279 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n);
280 _PUBLIC_ size_t ucs2_align(const void *base_ptr, const void *p, int flags);
283 * @brief Constant time compare to memory regions.
285 * @param[in] s1 The first memory region to compare.
287 * @param[in] s2 The second memory region to compare.
289 * @param[in] n The length of the memory to comapre.
291 * @return 0 when the memory regions are equal, 0 if not.
293 _PUBLIC_ int memcmp_const_time(const void *s1, const void *s2, size_t n);
296 Do a case-insensitive, whitespace-ignoring string compare.
298 _PUBLIC_ int strwicmp(const char *psz1, const char *psz2);
303 _PUBLIC_ void string_replace(char *s, char oldc, char newc);
308 * @note The comparison is case-insensitive.
310 _PUBLIC_ bool strequal(const char *s1, const char *s2);
312 #include "util_strlist.h"
314 /* The following definitions come from lib/util/util_strlist_v3.c */
317 * Needed for making an "unconst" list "const"
319 _PUBLIC_ const char **const_str_list(char **list);
322 * str_list_make, v3 version. The v4 version does not
323 * look at quoted strings with embedded blanks, so
324 * do NOT merge this function please!
326 char **str_list_make_v3(TALLOC_CTX *mem_ctx, const char *string,
330 const char **str_list_make_v3_const(TALLOC_CTX *mem_ctx,
334 /* The following definitions come from lib/util/util_file.c */
338 read a line from a file with possible \ continuation chars.
339 Blanks at the start or end of a line are stripped.
340 The string will be allocated if s2 is NULL
342 _PUBLIC_ char *fgets_slash(char *s2,int maxlen,XFILE *f);
345 * Read one line (data until next newline or eof) and allocate it
347 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint);
350 load a file into memory from a fd.
352 _PUBLIC_ char *fd_load(int fd, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx);
355 char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx);
358 load a file into memory
360 _PUBLIC_ char *file_load(const char *fname, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx);
363 load a file into memory and return an array of pointers to lines in the file
364 must be freed with talloc_free().
366 _PUBLIC_ char **file_lines_load(const char *fname, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx);
369 load a fd into memory and return an array of pointers to lines in the file
370 must be freed with talloc_free(). If convert is true calls unix_to_dos on
373 _PUBLIC_ char **fd_lines_load(int fd, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx);
375 _PUBLIC_ bool file_save_mode(const char *fname, const void *packet,
376 size_t length, mode_t mode);
378 save a lump of data into a file. Mostly used for debugging
380 _PUBLIC_ bool file_save(const char *fname, const void *packet, size_t length);
381 _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap) PRINTF_ATTRIBUTE(2,0);
382 _PUBLIC_ int fdprintf(int fd, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
385 compare two files, return true if the two files have the same content
387 bool file_compare(const char *path1, const char *path2);
389 /* The following definitions come from lib/util/util.c */
393 Find a suitable temporary directory. The result should be copied immediately
394 as it may be overwritten by a subsequent call.
396 _PUBLIC_ const char *tmpdir(void);
399 * Creates and immediately unlinks a file. Returns open file descriptor.
401 _PUBLIC_ int create_unlink_tmp(const char *dir);
404 Check if a file exists - call vfs_file_exist for samba files.
406 _PUBLIC_ bool file_exist(const char *fname);
409 Check a files mod time.
411 _PUBLIC_ time_t file_modtime(const char *fname);
414 Check if a directory exists.
416 _PUBLIC_ bool directory_exist(const char *dname);
419 Check file permissions.
421 _PUBLIC_ bool file_check_permissions(const char *fname,
427 * Try to create the specified directory if it didn't exist.
429 * @retval true if the directory already existed and has the right permissions
430 * or was successfully created.
432 _PUBLIC_ bool directory_create_or_exist(const char *dname, mode_t dir_perms);
434 _PUBLIC_ bool directory_create_or_exist_strict(const char *dname,
438 #include "blocking.h"
441 Sleep for a specified number of milliseconds.
443 _PUBLIC_ void smb_msleep(unsigned int t);
446 Get my own name, return in talloc'ed storage.
448 _PUBLIC_ char* get_myname(TALLOC_CTX *mem_ctx);
451 Check if a process exists. Does this work on all unixes?
453 _PUBLIC_ bool process_exists_by_pid(pid_t pid);
456 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
457 is dealt with in posix.c
459 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type);
462 * Write dump of binary data to the log file.
464 * The data is only written if the log level is at least level.
465 * 16 zero bytes in a row are omitted
467 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len);
470 malloc that aborts with smb_panic on fail or zero size.
472 _PUBLIC_ void *smb_xmalloc(size_t size);
475 Memdup with smb_panic on fail.
477 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size);
480 strdup that aborts on malloc fail.
482 _PUBLIC_ char *smb_xstrdup(const char *s);
484 char *smb_xstrndup(const char *s, size_t n);
487 Like strdup but for memory.
489 _PUBLIC_ void *smb_memdup(const void *p, size_t size);
492 * Write a password to the log file.
494 * @note Only actually does something if DEBUG_PASSWORD was defined during
497 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len);
500 * see if a range of memory is all zero. A NULL pointer is considered
503 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size);
506 realloc an array, checking for integer overflow in the array size
508 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail);
510 void *malloc_array(size_t el_size, unsigned int count);
512 void *memalign_array(size_t el_size, size_t align, unsigned int count);
514 void *calloc_array(size_t size, size_t nmemb);
516 /* The following definitions come from lib/util/fsusage.c */
520 * Retrieve amount of free disk space.
521 * this does all of the system specific guff to get the free disk space.
522 * It is derived from code in the GNU fileutils package, but has been
523 * considerably mangled for use here
525 * results are returned in *dfree and *dsize, in 512 byte units
527 _PUBLIC_ int sys_fsusage(const char *path, uint64_t *dfree, uint64_t *dsize);
529 /* The following definitions come from lib/util/ms_fnmatch.c */
534 * @brief MS-style Filename matching
537 int ms_fnmatch_protocol(const char *pattern, const char *string, int protocol);
539 /** a generic fnmatch function - uses for non-CIFS pattern matching */
540 int gen_fnmatch(const char *pattern, const char *string);
543 #include "idtree_random.h"
546 Close the low 3 fd's and open dev/null in their place
548 _PUBLIC_ void close_low_fds(bool stdin_too, bool stdout_too, bool stderr_too);
551 Become a daemon, discarding the controlling terminal.
553 _PUBLIC_ void become_daemon(bool do_fork, bool no_process_group, bool log_stdout);
556 Exit daemon and print error message to the log at level 0
557 Optionally report failure to systemd if systemd integration is enabled
559 _PUBLIC_ void exit_daemon(const char *msg, int error);
562 Report that the daemon is ready to serve connections to the log at level 0
563 Optionally report status to systemd if systemd integration is enabled
565 _PUBLIC_ void daemon_ready(const char *daemon);
568 * Report the daemon status. For example if it is not ready to serve connections
569 * and is waiting for some event to happen.
571 _PUBLIC_ void daemon_status(const char *name, const char *msg);
574 * @brief Get a password from the console.
576 * You should make sure that the buffer is an empty string!
578 * You can also use this function to ask for a username. Then you can fill the
579 * buffer with the username and it is shows to the users. If the users just
580 * presses enter the buffer will be untouched.
583 * char username[128];
585 * snprintf(username, sizeof(username), "john");
587 * smb_getpass("Username:", username, sizeof(username), 1, 0);
590 * The prompt will look like this:
594 * If you press enter then john is used as the username, or you can type it in
597 * @param[in] prompt The prompt to show to ask for the password.
599 * @param[out] buf The buffer the password should be stored. It NEEDS to be
600 * empty or filled out.
602 * @param[in] len The length of the buffer.
604 * @param[in] echo Should we echo what you type.
606 * @param[in] verify Should we ask for the password twice.
608 * @return 0 on success, -1 on error.
610 _PUBLIC_ int samba_getpass(const char *prompt, char *buf, size_t len,
611 bool echo, bool verify);
614 * Load a ini-style file.
616 bool pm_process( const char *fileName,
617 bool (*sfunc)(const char *, void *),
618 bool (*pfunc)(const char *, const char *, void *),
621 void print_asc(int level, const uint8_t *buf,int len);
622 void print_asc_cb(const uint8_t *buf, int len,
623 void (*cb)(const char *buf, void *private_data),
627 * Add an id to an array of ids.
629 * num should be a pointer to an integer that holds the current
630 * number of elements in ids. It will be updated by this function.
633 bool add_uid_to_array_unique(TALLOC_CTX *mem_ctx, uid_t uid,
634 uid_t **uids, uint32_t *num_uids);
635 bool add_gid_to_array_unique(TALLOC_CTX *mem_ctx, gid_t gid,
636 gid_t **gids, uint32_t *num_gids);
639 * Allocate anonymous shared memory of the given size
641 void *anonymous_shared_allocate(size_t bufsz);
642 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove);
643 void anonymous_shared_free(void *ptr);
646 run a command as a child process, with a timeout.
648 any stdout/stderr from the child will appear in the Samba logs with
649 the specified log levels
651 If callback is set then the callback is called on completion
652 with the return code from the command
654 struct tevent_context;
656 struct tevent_req *samba_runcmd_send(TALLOC_CTX *mem_ctx,
657 struct tevent_context *ev,
658 struct timeval endtime,
659 int stdout_log_level,
660 int stderr_log_level,
661 const char * const *argv0, ...);
662 int samba_runcmd_recv(struct tevent_req *req, int *perrno);
665 void samba_start_debugger(void);
669 * @brief Returns an absolute path to a file in the Samba modules directory.
671 * @param name File to find, relative to MODULESDIR.
673 * @retval Pointer to a string containing the full path.
675 char *modules_path(TALLOC_CTX *mem_ctx, const char *name);
678 * @brief Returns an absolute path to a file in the Samba data directory.
680 * @param name File to find, relative to CODEPAGEDIR.
682 * @retval Pointer to a talloc'ed string containing the full path.
684 char *data_path(TALLOC_CTX *mem_ctx, const char *name);
687 * @brief Returns the platform specific shared library extension.
689 * @retval Pointer to a const char * containing the extension.
691 const char *shlib_ext(void);
695 struct server_id_buf { char buf[48]; }; /* probably a bit too large ... */
696 char *server_id_str_buf(struct server_id id, struct server_id_buf *dst);
697 size_t server_id_str_buf_unique(struct server_id id, char *buf, size_t buflen);
699 bool server_id_same_process(const struct server_id *p1,
700 const struct server_id *p2);
701 bool server_id_equal(const struct server_id *p1, const struct server_id *p2);
702 struct server_id server_id_from_string(uint32_t local_vnn,
703 const char *pid_string);
706 * Set the serverid to the special value that represents a disconnected
707 * client for (e.g.) durable handles.
709 void server_id_set_disconnected(struct server_id *id);
712 * check whether a serverid is the special placeholder for
713 * a disconnected client
715 bool server_id_is_disconnected(const struct server_id *id);
717 #define SERVER_ID_BUF_LENGTH 24
718 void server_id_put(uint8_t buf[SERVER_ID_BUF_LENGTH],
719 const struct server_id id);
720 void server_id_get(struct server_id *id,
721 const uint8_t buf[SERVER_ID_BUF_LENGTH]);
724 * Samba code should use samba_tevent_context_init() instead of
725 * tevent_context_init() in order to get the debug output.
727 struct tevent_context *samba_tevent_context_init(TALLOC_CTX *mem_ctx);
730 * if same samba code needs to use a specific tevent backend
731 * it can use something like this:
733 * samba_tevent_set_debug(ev, "pysmb_tevent");
735 void samba_tevent_set_debug(struct tevent_context *ev, const char *name);
737 #endif /* _SAMBA_UTIL_H_ */