2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Jeremy Allison 2001-2002
6 Copyright (C) Simo Sorce 2001
7 Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
8 Copyright (C) James J Myers 2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "system/network.h"
26 #include "system/filesys.h"
27 #include "system/locale.h"
36 * @brief Misc utility functions
40 Find a suitable temporary directory. The result should be copied immediately
41 as it may be overwritten by a subsequent call.
43 _PUBLIC_ const char *tmpdir(void)
46 if ((p = getenv("TMPDIR")))
53 Check if a file exists - call vfs_file_exist for samba files.
55 _PUBLIC_ bool file_exist(const char *fname)
59 if (stat(fname, &st) != 0) {
63 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
67 Check a files mod time.
70 _PUBLIC_ time_t file_modtime(const char *fname)
74 if (stat(fname,&st) != 0)
81 Check if a directory exists.
84 _PUBLIC_ bool directory_exist(const char *dname)
89 if (stat(dname,&st) != 0) {
93 ret = S_ISDIR(st.st_mode);
100 * Try to create the specified directory if it didn't exist.
102 * @retval true if the directory already existed and has the right permissions
103 * or was successfully created.
105 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
111 old_umask = umask(0);
112 if (lstat(dname, &st) == -1) {
113 if (errno == ENOENT) {
114 /* Create directory */
115 if (mkdir(dname, dir_perms) == -1) {
116 DEBUG(0, ("error creating directory "
123 DEBUG(0, ("lstat failed on directory %s: %s\n",
124 dname, strerror(errno)));
129 /* Check ownership and permission on existing directory */
130 if (!S_ISDIR(st.st_mode)) {
131 DEBUG(0, ("directory %s isn't a directory\n",
136 if ((st.st_uid != uid) ||
137 ((st.st_mode & 0777) != dir_perms)) {
138 DEBUG(0, ("invalid permissions on directory "
149 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
155 _PUBLIC_ int set_blocking(int fd, bool set)
159 #define FLAG_TO_SET O_NONBLOCK
162 #define FLAG_TO_SET O_NDELAY
164 #define FLAG_TO_SET FNDELAY
168 if((val = fcntl(fd, F_GETFL, 0)) == -1)
170 if(set) /* Turn blocking on - ie. clear nonblock flag */
174 return fcntl( fd, F_SETFL, val);
180 Sleep for a specified number of milliseconds.
183 _PUBLIC_ void msleep(unsigned int t)
187 tval.tv_sec = t/1000;
188 tval.tv_usec = 1000*(t%1000);
189 /* this should be the real select - do NOT replace
191 select(0,NULL,NULL,NULL,&tval);
195 Get my own name, return in malloc'ed storage.
198 _PUBLIC_ char *get_myname(void)
203 hostname = (char *)malloc(MAXHOSTNAMELEN+1);
206 /* get my host name */
207 if (gethostname(hostname, MAXHOSTNAMELEN+1) == -1) {
208 DEBUG(0,("gethostname failed\n"));
212 /* Ensure null termination. */
213 hostname[MAXHOSTNAMELEN] = '\0';
215 /* split off any parts after an initial . */
216 p = strchr(hostname, '.');
225 Check if a process exists. Does this work on all unixes?
228 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
230 /* Doing kill with a non-positive pid causes messages to be
231 * sent to places we don't want. */
233 return(kill(pid,0) == 0 || errno != ESRCH);
237 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
238 is dealt with in posix.c
241 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
246 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
249 lock.l_whence = SEEK_SET;
250 lock.l_start = offset;
254 ret = fcntl(fd,op,&lock);
256 if (ret == -1 && errno != 0)
257 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
262 (lock.l_type != F_UNLCK) &&
264 (lock.l_pid != getpid())) {
265 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
269 /* it must be not locked or locked by me */
273 /* a lock set or unset */
275 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
276 (double)offset,(double)count,op,type,strerror(errno)));
280 /* everything went OK */
281 DEBUG(8,("fcntl_lock: Lock call successful\n"));
287 void print_asc(int level, const uint8_t *buf,int len)
291 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
295 * Write dump of binary data to the log file.
297 * The data is only written if the log level is at least level.
299 static void _dump_data(int level, const uint8_t *buf, int len,
300 bool omit_zero_bytes)
303 const uint8_t empty[16];
304 bool skipped = false;
308 if (!DEBUGLVL(level)) return;
310 memset(&empty, '\0', 16);
315 if ((omit_zero_bytes == true) &&
318 (memcmp(&buf[i], &empty, 16) == 0))
325 DEBUGADD(level,("[%04X] ",i));
329 DEBUGADD(level,("%02X ",(int)buf[i]));
331 if (i%8 == 0) DEBUGADD(level,(" "));
334 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
335 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
337 if ((omit_zero_bytes == true) &&
339 (memcmp(&buf[i], &empty, 16) == 0)) {
341 DEBUGADD(level,("skipping zero buffer bytes\n"));
351 DEBUGADD(level,(" "));
352 if (n>8) DEBUGADD(level,(" "));
353 while (n--) DEBUGADD(level,(" "));
355 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
357 if (n>0) print_asc(level,&buf[i-n],n);
358 DEBUGADD(level,("\n"));
364 * Write dump of binary data to the log file.
366 * The data is only written if the log level is at least level.
368 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
370 _dump_data(level, buf, len, false);
374 * Write dump of binary data to the log file.
376 * The data is only written if the log level is at least level.
377 * 16 zero bytes in a row are ommited
379 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
381 _dump_data(level, buf, len, true);
386 malloc that aborts with smb_panic on fail or zero size.
389 _PUBLIC_ void *smb_xmalloc(size_t size)
393 smb_panic("smb_xmalloc: called with zero size.\n");
394 if ((p = malloc(size)) == NULL)
395 smb_panic("smb_xmalloc: malloc fail.\n");
400 Memdup with smb_panic on fail.
403 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
406 p2 = smb_xmalloc(size);
412 strdup that aborts on malloc fail.
415 char *smb_xstrdup(const char *s)
417 #if defined(PARANOID_MALLOC_CHECKER)
424 #define strdup rep_strdup
427 char *s1 = strdup(s);
428 #if defined(PARANOID_MALLOC_CHECKER)
432 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
435 smb_panic("smb_xstrdup: malloc failed");
442 strndup that aborts on malloc fail.
445 char *smb_xstrndup(const char *s, size_t n)
447 #if defined(PARANOID_MALLOC_CHECKER)
453 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
455 #define strndup rep_strndup
458 char *s1 = strndup(s, n);
459 #if defined(PARANOID_MALLOC_CHECKER)
463 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
466 smb_panic("smb_xstrndup: malloc failed");
474 Like strdup but for memory.
477 _PUBLIC_ void *memdup(const void *p, size_t size)
490 * Write a password to the log file.
492 * @note Only actually does something if DEBUG_PASSWORD was defined during
495 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
497 #ifdef DEBUG_PASSWORD
498 DEBUG(11, ("%s", msg));
499 if (data != NULL && len > 0)
501 dump_data(11, data, len);
508 * see if a range of memory is all zero. A NULL pointer is considered
511 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
514 if (!ptr) return true;
515 for (i=0;i<size;i++) {
516 if (ptr[i]) return false;
522 realloc an array, checking for integer overflow in the array size
524 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
526 #define MAX_MALLOC_SIZE 0x7fffffff
528 count >= MAX_MALLOC_SIZE/el_size) {
534 return malloc(el_size * count);
536 return realloc(ptr, el_size * count);
539 /****************************************************************************
541 ****************************************************************************/
543 void *malloc_array(size_t el_size, unsigned int count)
545 return realloc_array(NULL, el_size, count, false);
548 _PUBLIC_ void *talloc_check_name_abort(const void *ptr, const char *name)
552 result = talloc_check_name(ptr, name);
556 DEBUG(0, ("Talloc type mismatch, expected %s, got %s\n",
557 name, talloc_get_name(ptr)));
558 smb_panic("talloc type mismatch");
559 /* Keep the compiler happy */
564 Trim the specified elements off the front and back of a string.
566 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
573 /* Ignore null or empty strings. */
574 if (!s || (s[0] == '\0'))
577 front_len = front? strlen(front) : 0;
578 back_len = back? strlen(back) : 0;
583 while (len && strncmp(s, front, front_len)==0) {
584 /* Must use memmove here as src & dest can
585 * easily overlap. Found by valgrind. JRA. */
586 memmove(s, s+front_len, (len-front_len)+1);
593 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
594 s[len-back_len]='\0';
603 Find the number of 'c' chars in a string
605 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
610 if (*s == c) count++;
618 Routine to get hex characters and turn them into a 16 byte array.
619 the array can be variable length, and any non-hex-numeric
620 characters are skipped. "0xnn" or "0Xnn" is specially catered
623 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
627 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
630 size_t num_chars = 0;
631 uint8_t lonybble, hinybble;
632 const char *hexchars = "0123456789ABCDEF";
633 char *p1 = NULL, *p2 = NULL;
635 for (i = 0; i < strhex_len && strhex[i] != 0; i++) {
636 if (strncasecmp(hexchars, "0x", 2) == 0) {
637 i++; /* skip two chars */
641 if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
644 i++; /* next hex digit */
646 if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
649 /* get the two nybbles */
650 hinybble = PTR_DIFF(p1, hexchars);
651 lonybble = PTR_DIFF(p2, hexchars);
653 if (num_chars >= p_len) {
657 p[num_chars] = (hinybble << 4) | lonybble;
667 * Parse a hex string and return a data blob.
669 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
671 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
673 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
682 * Routine to print a buffer as HEX digits, into an allocated string.
684 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
689 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
690 hex_buffer = *out_hex_buffer;
692 for (i = 0; i < len; i++)
693 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
697 * talloc version of hex_encode()
699 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
704 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
706 for (i = 0; i < len; i++)
707 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
713 Unescape a URL encoded string, in place.
716 _PUBLIC_ void rfc1738_unescape(char *buf)
720 while ((p=strchr(p,'+')))
725 while (p && *p && (p=strchr(p,'%'))) {
729 if (c1 >= '0' && c1 <= '9')
731 else if (c1 >= 'A' && c1 <= 'F')
733 else if (c1 >= 'a' && c1 <= 'f')
735 else {p++; continue;}
737 if (c2 >= '0' && c2 <= '9')
739 else if (c2 >= 'A' && c2 <= 'F')
741 else if (c2 >= 'a' && c2 <= 'f')
743 else {p++; continue;}
747 memmove(p+1, p+3, strlen(p+3)+1);
753 varient of strcmp() that handles NULL ptrs
755 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
760 if (s1 == NULL || s2 == NULL) {
763 return strcmp(s1, s2);
768 return the number of bytes occupied by a buffer in ASCII format
769 the result includes the null termination
772 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
776 len = strnlen(src, n);
785 Set a boolean variable from the text value stored in the passed string.
786 Returns true in success, false if the passed string does not correctly
790 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
792 if (strwicmp(boolean_string, "yes") == 0 ||
793 strwicmp(boolean_string, "true") == 0 ||
794 strwicmp(boolean_string, "on") == 0 ||
795 strwicmp(boolean_string, "1") == 0) {
798 } else if (strwicmp(boolean_string, "no") == 0 ||
799 strwicmp(boolean_string, "false") == 0 ||
800 strwicmp(boolean_string, "off") == 0 ||
801 strwicmp(boolean_string, "0") == 0) {
809 return the number of bytes occupied by a buffer in CH_UTF16 format
810 the result includes the null termination
812 _PUBLIC_ size_t utf16_len(const void *buf)
816 for (len = 0; SVAL(buf,len); len += 2) ;
822 return the number of bytes occupied by a buffer in CH_UTF16 format
823 the result includes the null termination
826 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
830 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;