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/byteorder.h"
50 #include "lib/util/talloc_stack.h"
53 #define ABS(a) ((a)>0?(a):(-(a)))
56 #include "lib/util/memory.h"
58 #include "../libcli/util/ntstatus.h"
59 #include "lib/util/string_wrappers.h"
63 #include "lib/util/util.h"
66 * Write backtrace to debug log
68 _PUBLIC_ void dump_core_setup(const char *progname, const char *logfile);
71 register a fault handler.
72 Should only be called once in the execution of smbd.
74 _PUBLIC_ bool register_fault_handler(const char *name, void (*fault_handler)(int sig));
76 #include "lib/util/signal.h" /* Avoid /usr/include/signal.h */
80 _PUBLIC_ int sys_getnameinfo(const struct sockaddr *psa,
88 /* The following definitions come from lib/util/genrand.c */
90 #include "lib/util/genrand.h"
93 generate a single random uint32_t
95 _PUBLIC_ uint32_t generate_random(void);
98 very basic password quality checker
100 _PUBLIC_ bool check_password_quality(const char *s);
103 * Generate a random text password.
105 _PUBLIC_ char *generate_random_password(TALLOC_CTX *mem_ctx, size_t min, size_t max);
108 Use the random number generator to generate a random string.
110 _PUBLIC_ char *generate_random_str_list(TALLOC_CTX *mem_ctx, size_t len, const char *list);
113 * Generate a random text string consisting of the specified length.
114 * The returned string will be allocated.
116 * Characters used are: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_-#.,
118 _PUBLIC_ char *generate_random_str(TALLOC_CTX *mem_ctx, size_t len);
121 * Generate an array of unique text strings all of the same length.
122 * The returned strings will be allocated.
123 * Returns NULL if the number of unique combinations cannot be created.
125 * Characters used are: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+_-#.,
127 _PUBLIC_ char** generate_unique_strs(TALLOC_CTX *mem_ctx, size_t len,
130 /* The following definitions come from lib/util/dprintf.c */
132 _PUBLIC_ int d_fprintf(FILE *f, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
133 _PUBLIC_ int d_printf(const char *format, ...) PRINTF_ATTRIBUTE(1,2);
134 _PUBLIC_ void display_set_stderr(void);
136 /* The following definitions come from lib/util/util_str.c */
138 bool next_token_talloc(TALLOC_CTX *ctx,
144 * Get the next token from a string, return false if none found. Handles
145 * double-quotes. This version does not trim leading separator characters
146 * before looking for a token.
148 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
155 Trim the specified elements off the front and back of a string.
157 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back);
160 Find the number of 'c' chars in a string
162 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c);
165 Routine to get hex characters and turn them into a 16 byte array.
166 the array can be variable length, and any non-hex-numeric
167 characters are skipped. "0xnn" or "0Xnn" is specially catered
170 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
174 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len);
177 * Parse a hex string and return a data blob.
179 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex) ;
182 * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
184 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen);
187 * talloc version of hex_encode_buf()
189 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len);
191 #include "substitute.h"
194 Unescape a URL encoded string, in place.
196 _PUBLIC_ void rfc1738_unescape(char *buf);
201 * Returns a static buffer that contains the RFC
202 * 1738 compliant, escaped version of the given url. (escapes unsafe and % characters)
204 _PUBLIC_ char *rfc1738_escape(TALLOC_CTX *mem_ctx, const char *url);
207 * rfc1738_escape_unescaped
209 * Returns a static buffer that contains
210 * the RFC 1738 compliant, escaped version of the given url (escapes unsafe chars only)
212 _PUBLIC_ char *rfc1738_escape_unescaped(TALLOC_CTX *mem_ctx, const char *url);
215 * rfc1738_escape_part
216 * Returns a static buffer that contains the RFC
217 * 1738 compliant, escaped version of the given url segment. (escapes
218 * unsafe, reserved and % chars) It would mangle the :// in http://,
219 * and mangle paths (because of /).
221 _PUBLIC_ char *rfc1738_escape_part(TALLOC_CTX *mem_ctx, const char *url);
224 varient of strcmp() that handles NULL ptrs
226 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2);
229 return the number of bytes occupied by a buffer in ASCII format
230 the result includes the null termination
233 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n);
236 Set a boolean variable from the text value stored in the passed string.
237 Returns true in success, false if the passed string does not correctly
240 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean);
243 * Parse a string containing a boolean value.
245 * val will be set to the read value.
247 * @retval true if a boolean value was parsed, false otherwise.
249 _PUBLIC_ bool conv_str_bool(const char * str, bool * val);
252 * Convert a size specification like 16K into an integral number of bytes.
254 _PUBLIC_ bool conv_str_size_error(const char * str, uint64_t * val);
257 * Parse a uint64_t value from a string
259 * val will be set to the value read.
261 * @retval true if parsing was successful, false otherwise
263 _PUBLIC_ bool conv_str_u64(const char * str, uint64_t * val);
266 return the number of bytes occupied by a buffer in CH_UTF16 format
267 the result includes the null termination
269 _PUBLIC_ size_t utf16_len(const void *buf);
272 return the number of bytes occupied by a buffer in CH_UTF16 format
273 the result includes the null termination
276 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n);
277 _PUBLIC_ size_t ucs2_align(const void *base_ptr, const void *p, int flags);
280 * @brief Constant time compare to memory regions.
282 * @param[in] s1 The first memory region to compare.
284 * @param[in] s2 The second memory region to compare.
286 * @param[in] n The length of the memory to comapre.
288 * @return 0 when the memory regions are equal, 0 if not.
290 _PUBLIC_ int memcmp_const_time(const void *s1, const void *s2, size_t n);
293 Do a case-insensitive, whitespace-ignoring string compare.
295 _PUBLIC_ int strwicmp(const char *psz1, const char *psz2);
300 _PUBLIC_ void string_replace(char *s, char oldc, char newc);
305 * @note The comparison is case-insensitive.
307 _PUBLIC_ bool strequal(const char *s1, const char *s2);
309 #include "util_strlist.h"
311 /* The following definitions come from lib/util/util_strlist_v3.c */
314 * Needed for making an "unconst" list "const"
316 _PUBLIC_ const char **const_str_list(char **list);
319 * str_list_make, v3 version. The v4 version does not
320 * look at quoted strings with embedded blanks, so
321 * do NOT merge this function please!
323 char **str_list_make_v3(TALLOC_CTX *mem_ctx, const char *string,
327 const char **str_list_make_v3_const(TALLOC_CTX *mem_ctx,
331 /* The following definitions come from lib/util/util_file.c */
335 * Read one line (data until next newline or eof) and allocate it
337 _PUBLIC_ char *afdgets(int fd, TALLOC_CTX *mem_ctx, size_t hint);
339 char *fgets_slash(TALLOC_CTX *mem_ctx, char *s2, int maxlen, FILE *f);
342 load a file into memory from a fd.
344 _PUBLIC_ char *fd_load(int fd, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx);
347 char **file_lines_parse(char *p, size_t size, int *numlines, TALLOC_CTX *mem_ctx);
350 load a file into memory
352 _PUBLIC_ char *file_load(const char *fname, size_t *size, size_t maxsize, TALLOC_CTX *mem_ctx);
355 load a file into memory and return an array of pointers to lines in the file
356 must be freed with talloc_free().
358 _PUBLIC_ char **file_lines_load(const char *fname, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx);
361 load a fd into memory and return an array of pointers to lines in the file
362 must be freed with talloc_free(). If convert is true calls unix_to_dos on
365 _PUBLIC_ char **fd_lines_load(int fd, int *numlines, size_t maxsize, TALLOC_CTX *mem_ctx);
367 _PUBLIC_ bool file_save_mode(const char *fname, const void *packet,
368 size_t length, mode_t mode);
370 save a lump of data into a file. Mostly used for debugging
372 _PUBLIC_ bool file_save(const char *fname, const void *packet, size_t length);
373 _PUBLIC_ int vfdprintf(int fd, const char *format, va_list ap) PRINTF_ATTRIBUTE(2,0);
374 _PUBLIC_ int fdprintf(int fd, const char *format, ...) PRINTF_ATTRIBUTE(2,3);
377 compare two files, return true if the two files have the same content
379 bool file_compare(const char *path1, const char *path2);
381 /* The following definitions come from lib/util/util.c */
385 Find a suitable temporary directory. The result should be copied immediately
386 as it may be overwritten by a subsequent call.
388 _PUBLIC_ const char *tmpdir(void);
391 * Creates and immediately unlinks a file. Returns open file descriptor.
393 _PUBLIC_ int create_unlink_tmp(const char *dir);
396 Check if a file exists - call vfs_file_exist for samba files.
398 _PUBLIC_ bool file_exist(const char *fname);
401 Check a files mod time.
403 _PUBLIC_ time_t file_modtime(const char *fname);
406 Check if a directory exists.
408 _PUBLIC_ bool directory_exist(const char *dname);
411 Check file permissions.
413 _PUBLIC_ bool file_check_permissions(const char *fname,
419 * Try to create the specified directory if it didn't exist.
421 * @retval true if the directory already existed and has the right permissions
422 * or was successfully created.
424 _PUBLIC_ bool directory_create_or_exist(const char *dname, mode_t dir_perms);
426 _PUBLIC_ bool directory_create_or_exist_strict(const char *dname,
430 #include "blocking.h"
433 Sleep for a specified number of milliseconds.
435 _PUBLIC_ void smb_msleep(unsigned int t);
438 Get my own name, return in talloc'ed storage.
440 _PUBLIC_ char* get_myname(TALLOC_CTX *mem_ctx);
443 Check if a process exists. Does this work on all unixes?
445 _PUBLIC_ bool process_exists_by_pid(pid_t pid);
448 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
449 is dealt with in posix.c
451 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type);
454 * Write dump of binary data to the log file.
456 * The data is only written if the log level is at least level.
457 * 16 zero bytes in a row are omitted
459 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len);
462 malloc that aborts with smb_panic on fail or zero size.
464 _PUBLIC_ void *smb_xmalloc(size_t size);
467 Memdup with smb_panic on fail.
469 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size);
472 strdup that aborts on malloc fail.
474 _PUBLIC_ char *smb_xstrdup(const char *s);
476 char *smb_xstrndup(const char *s, size_t n);
479 Like strdup but for memory.
481 _PUBLIC_ void *smb_memdup(const void *p, size_t size);
484 * Write a password to the log file.
486 * @note Only actually does something if DEBUG_PASSWORD was defined during
489 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len);
492 * see if a range of memory is all zero. A NULL pointer is considered
495 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size);
498 realloc an array, checking for integer overflow in the array size
500 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail);
502 void *malloc_array(size_t el_size, unsigned int count);
504 void *memalign_array(size_t el_size, size_t align, unsigned int count);
506 void *calloc_array(size_t size, size_t nmemb);
508 /* The following definitions come from lib/util/fsusage.c */
512 * Retrieve amount of free disk space.
513 * this does all of the system specific guff to get the free disk space.
514 * It is derived from code in the GNU fileutils package, but has been
515 * considerably mangled for use here
517 * results are returned in *dfree and *dsize, in 512 byte units
519 _PUBLIC_ int sys_fsusage(const char *path, uint64_t *dfree, uint64_t *dsize);
521 /* The following definitions come from lib/util/ms_fnmatch.c */
526 * @brief MS-style Filename matching
529 int ms_fnmatch_protocol(const char *pattern, const char *string, int protocol);
531 /** a generic fnmatch function - uses for non-CIFS pattern matching */
532 int gen_fnmatch(const char *pattern, const char *string);
535 #include "idtree_random.h"
538 Close the low 3 fd's and open dev/null in their place
540 _PUBLIC_ void close_low_fds(bool stdin_too, bool stdout_too, bool stderr_too);
543 Become a daemon, discarding the controlling terminal.
545 _PUBLIC_ void become_daemon(bool do_fork, bool no_process_group, bool log_stdout);
548 Exit daemon and print error message to the log at level 0
549 Optionally report failure to systemd if systemd integration is enabled
551 _PUBLIC_ void exit_daemon(const char *msg, int error);
554 Report that the daemon is ready to serve connections to the log at level 0
555 Optionally report status to systemd if systemd integration is enabled
557 _PUBLIC_ void daemon_ready(const char *daemon);
560 * Report the daemon status. For example if it is not ready to serve connections
561 * and is waiting for some event to happen.
563 _PUBLIC_ void daemon_status(const char *name, const char *msg);
566 * @brief Get a password from the console.
568 * You should make sure that the buffer is an empty string!
570 * You can also use this function to ask for a username. Then you can fill the
571 * buffer with the username and it is shows to the users. If the users just
572 * presses enter the buffer will be untouched.
575 * char username[128];
577 * snprintf(username, sizeof(username), "john");
579 * smb_getpass("Username:", username, sizeof(username), 1, 0);
582 * The prompt will look like this:
586 * If you press enter then john is used as the username, or you can type it in
589 * @param[in] prompt The prompt to show to ask for the password.
591 * @param[out] buf The buffer the password should be stored. It NEEDS to be
592 * empty or filled out.
594 * @param[in] len The length of the buffer.
596 * @param[in] echo Should we echo what you type.
598 * @param[in] verify Should we ask for the password twice.
600 * @return 0 on success, -1 on error.
602 _PUBLIC_ int samba_getpass(const char *prompt, char *buf, size_t len,
603 bool echo, bool verify);
606 * Load a ini-style file.
608 bool pm_process( const char *fileName,
609 bool (*sfunc)(const char *, void *),
610 bool (*pfunc)(const char *, const char *, void *),
612 bool pm_process_with_flags(const char *filename,
613 bool allow_empty_values,
614 bool (*sfunc)(const char *section, void *private_data),
615 bool (*pfunc)(const char *name, const char *value,
619 void print_asc(int level, const uint8_t *buf,int len);
620 void print_asc_cb(const uint8_t *buf, int len,
621 void (*cb)(const char *buf, void *private_data),
625 * Add an id to an array of ids.
627 * num should be a pointer to an integer that holds the current
628 * number of elements in ids. It will be updated by this function.
631 bool add_uid_to_array_unique(TALLOC_CTX *mem_ctx, uid_t uid,
632 uid_t **uids, uint32_t *num_uids);
633 bool add_gid_to_array_unique(TALLOC_CTX *mem_ctx, gid_t gid,
634 gid_t **gids, uint32_t *num_gids);
637 * Allocate anonymous shared memory of the given size
639 void *anonymous_shared_allocate(size_t bufsz);
640 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove);
641 void anonymous_shared_free(void *ptr);
644 run a command as a child process, with a timeout.
646 any stdout/stderr from the child will appear in the Samba logs with
647 the specified log levels
649 If callback is set then the callback is called on completion
650 with the return code from the command
652 struct tevent_context;
654 struct tevent_req *samba_runcmd_send(TALLOC_CTX *mem_ctx,
655 struct tevent_context *ev,
656 struct timeval endtime,
657 int stdout_log_level,
658 int stderr_log_level,
659 const char * const *argv0, ...);
660 int samba_runcmd_recv(struct tevent_req *req, int *perrno);
663 void samba_start_debugger(void);
667 * @brief Returns an absolute path to a file in the Samba modules directory.
669 * @param name File to find, relative to MODULESDIR.
671 * @retval Pointer to a string containing the full path.
673 char *modules_path(TALLOC_CTX *mem_ctx, const char *name);
676 * @brief Returns an absolute path to a file in the Samba data directory.
678 * @param name File to find, relative to CODEPAGEDIR.
680 * @retval Pointer to a talloc'ed string containing the full path.
682 char *data_path(TALLOC_CTX *mem_ctx, const char *name);
685 * @brief Returns the platform specific shared library extension.
687 * @retval Pointer to a const char * containing the extension.
689 const char *shlib_ext(void);
693 struct server_id_buf { char buf[48]; }; /* probably a bit too large ... */
694 char *server_id_str_buf(struct server_id id, struct server_id_buf *dst);
695 size_t server_id_str_buf_unique(struct server_id id, char *buf, size_t buflen);
697 bool server_id_same_process(const struct server_id *p1,
698 const struct server_id *p2);
699 bool server_id_equal(const struct server_id *p1, const struct server_id *p2);
700 struct server_id server_id_from_string(uint32_t local_vnn,
701 const char *pid_string);
704 * Set the serverid to the special value that represents a disconnected
705 * client for (e.g.) durable handles.
707 void server_id_set_disconnected(struct server_id *id);
710 * check whether a serverid is the special placeholder for
711 * a disconnected client
713 bool server_id_is_disconnected(const struct server_id *id);
715 #define SERVER_ID_BUF_LENGTH 24
716 void server_id_put(uint8_t buf[SERVER_ID_BUF_LENGTH],
717 const struct server_id id);
718 void server_id_get(struct server_id *id,
719 const uint8_t buf[SERVER_ID_BUF_LENGTH]);
722 * Samba code should use samba_tevent_context_init() instead of
723 * tevent_context_init() in order to get the debug output.
725 struct tevent_context *samba_tevent_context_init(TALLOC_CTX *mem_ctx);
728 * if same samba code needs to use a specific tevent backend
729 * it can use something like this:
731 * samba_tevent_set_debug(ev, "pysmb_tevent");
733 void samba_tevent_set_debug(struct tevent_context *ev, const char *name);
735 #endif /* _SAMBA_UTIL_H_ */