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 && !uwrap_enabled()) {
137 DEBUG(0, ("invalid ownership on directory "
142 if ((st.st_mode & 0777) != dir_perms) {
143 DEBUG(0, ("invalid permissions on directory "
154 Sleep for a specified number of milliseconds.
157 _PUBLIC_ void msleep(unsigned int t)
161 tval.tv_sec = t/1000;
162 tval.tv_usec = 1000*(t%1000);
163 /* this should be the real select - do NOT replace
165 select(0,NULL,NULL,NULL,&tval);
169 Get my own name, return in talloc'ed storage.
172 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
175 char hostname[HOST_NAME_MAX];
177 /* get my host name */
178 if (gethostname(hostname, sizeof(hostname)) == -1) {
179 DEBUG(0,("gethostname failed\n"));
183 /* Ensure null termination. */
184 hostname[sizeof(hostname)-1] = '\0';
186 /* split off any parts after an initial . */
187 p = strchr_m(hostname, '.');
192 return talloc_strdup(ctx, hostname);
196 Check if a process exists. Does this work on all unixes?
199 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
201 /* Doing kill with a non-positive pid causes messages to be
202 * sent to places we don't want. */
204 return(kill(pid,0) == 0 || errno != ESRCH);
208 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
209 is dealt with in posix.c
212 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
217 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
220 lock.l_whence = SEEK_SET;
221 lock.l_start = offset;
225 ret = fcntl(fd,op,&lock);
227 if (ret == -1 && errno != 0)
228 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
233 (lock.l_type != F_UNLCK) &&
235 (lock.l_pid != getpid())) {
236 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
240 /* it must be not locked or locked by me */
244 /* a lock set or unset */
246 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
247 (double)offset,(double)count,op,type,strerror(errno)));
251 /* everything went OK */
252 DEBUG(8,("fcntl_lock: Lock call successful\n"));
257 void print_asc(int level, const uint8_t *buf,int len)
261 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
265 * Write dump of binary data to the log file.
267 * The data is only written if the log level is at least level.
269 static void _dump_data(int level, const uint8_t *buf, int len,
270 bool omit_zero_bytes)
273 static const uint8_t empty[16] = { 0, };
274 bool skipped = false;
278 if (!DEBUGLVL(level)) return;
283 if ((omit_zero_bytes == true) &&
286 (memcmp(&buf[i], &empty, 16) == 0))
293 DEBUGADD(level,("[%04X] ",i));
297 DEBUGADD(level,("%02X ",(int)buf[i]));
299 if (i%8 == 0) DEBUGADD(level,(" "));
302 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
303 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
305 if ((omit_zero_bytes == true) &&
307 (memcmp(&buf[i], &empty, 16) == 0)) {
309 DEBUGADD(level,("skipping zero buffer bytes\n"));
319 DEBUGADD(level,(" "));
320 if (n>8) DEBUGADD(level,(" "));
321 while (n--) DEBUGADD(level,(" "));
323 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
325 if (n>0) print_asc(level,&buf[i-n],n);
326 DEBUGADD(level,("\n"));
332 * Write dump of binary data to the log file.
334 * The data is only written if the log level is at least level.
336 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
338 _dump_data(level, buf, len, false);
342 * Write dump of binary data to the log file.
344 * The data is only written if the log level is at least level.
345 * 16 zero bytes in a row are ommited
347 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
349 _dump_data(level, buf, len, true);
354 malloc that aborts with smb_panic on fail or zero size.
357 _PUBLIC_ void *smb_xmalloc(size_t size)
361 smb_panic("smb_xmalloc: called with zero size.\n");
362 if ((p = malloc(size)) == NULL)
363 smb_panic("smb_xmalloc: malloc fail.\n");
368 Memdup with smb_panic on fail.
371 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
374 p2 = smb_xmalloc(size);
380 strdup that aborts on malloc fail.
383 char *smb_xstrdup(const char *s)
385 #if defined(PARANOID_MALLOC_CHECKER)
392 #define strdup rep_strdup
395 char *s1 = strdup(s);
396 #if defined(PARANOID_MALLOC_CHECKER)
400 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
403 smb_panic("smb_xstrdup: malloc failed");
410 strndup that aborts on malloc fail.
413 char *smb_xstrndup(const char *s, size_t n)
415 #if defined(PARANOID_MALLOC_CHECKER)
421 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
423 #define strndup rep_strndup
426 char *s1 = strndup(s, n);
427 #if defined(PARANOID_MALLOC_CHECKER)
431 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
434 smb_panic("smb_xstrndup: malloc failed");
442 Like strdup but for memory.
445 _PUBLIC_ void *memdup(const void *p, size_t size)
458 * Write a password to the log file.
460 * @note Only actually does something if DEBUG_PASSWORD was defined during
463 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
465 #ifdef DEBUG_PASSWORD
466 DEBUG(11, ("%s", msg));
467 if (data != NULL && len > 0)
469 dump_data(11, data, len);
476 * see if a range of memory is all zero. A NULL pointer is considered
479 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
482 if (!ptr) return true;
483 for (i=0;i<size;i++) {
484 if (ptr[i]) return false;
490 realloc an array, checking for integer overflow in the array size
492 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
494 #define MAX_MALLOC_SIZE 0x7fffffff
496 count >= MAX_MALLOC_SIZE/el_size) {
502 return malloc(el_size * count);
504 return realloc(ptr, el_size * count);
507 /****************************************************************************
509 ****************************************************************************/
511 void *malloc_array(size_t el_size, unsigned int count)
513 return realloc_array(NULL, el_size, count, false);
517 Trim the specified elements off the front and back of a string.
519 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
526 /* Ignore null or empty strings. */
527 if (!s || (s[0] == '\0'))
530 front_len = front? strlen(front) : 0;
531 back_len = back? strlen(back) : 0;
536 while (len && strncmp(s, front, front_len)==0) {
537 /* Must use memmove here as src & dest can
538 * easily overlap. Found by valgrind. JRA. */
539 memmove(s, s+front_len, (len-front_len)+1);
546 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
547 s[len-back_len]='\0';
556 Find the number of 'c' chars in a string
558 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
563 if (*s == c) count++;
571 Routine to get hex characters and turn them into a 16 byte array.
572 the array can be variable length, and any non-hex-numeric
573 characters are skipped. "0xnn" or "0Xnn" is specially catered
576 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
580 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
583 size_t num_chars = 0;
584 uint8_t lonybble, hinybble;
585 const char *hexchars = "0123456789ABCDEF";
586 char *p1 = NULL, *p2 = NULL;
588 for (i = 0; i < strhex_len && strhex[i] != 0; i++) {
589 if (strncasecmp(hexchars, "0x", 2) == 0) {
590 i++; /* skip two chars */
594 if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
597 i++; /* next hex digit */
599 if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
602 /* get the two nybbles */
603 hinybble = PTR_DIFF(p1, hexchars);
604 lonybble = PTR_DIFF(p2, hexchars);
606 if (num_chars >= p_len) {
610 p[num_chars] = (hinybble << 4) | lonybble;
620 * Parse a hex string and return a data blob.
622 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
624 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
626 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
635 * Routine to print a buffer as HEX digits, into an allocated string.
637 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
642 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
643 hex_buffer = *out_hex_buffer;
645 for (i = 0; i < len; i++)
646 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
650 * talloc version of hex_encode()
652 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
657 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
662 for (i = 0; i < len; i++)
663 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
665 talloc_set_name_const(hex_buffer, hex_buffer);
670 Unescape a URL encoded string, in place.
673 _PUBLIC_ void rfc1738_unescape(char *buf)
677 while ((p=strchr(p,'+')))
682 while (p && *p && (p=strchr(p,'%'))) {
686 if (c1 >= '0' && c1 <= '9')
688 else if (c1 >= 'A' && c1 <= 'F')
690 else if (c1 >= 'a' && c1 <= 'f')
692 else {p++; continue;}
694 if (c2 >= '0' && c2 <= '9')
696 else if (c2 >= 'A' && c2 <= 'F')
698 else if (c2 >= 'a' && c2 <= 'f')
700 else {p++; continue;}
704 memmove(p+1, p+3, strlen(p+3)+1);
710 varient of strcmp() that handles NULL ptrs
712 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
717 if (s1 == NULL || s2 == NULL) {
720 return strcmp(s1, s2);
725 return the number of bytes occupied by a buffer in ASCII format
726 the result includes the null termination
729 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
733 len = strnlen(src, n);
742 Set a boolean variable from the text value stored in the passed string.
743 Returns true in success, false if the passed string does not correctly
747 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
749 if (strwicmp(boolean_string, "yes") == 0 ||
750 strwicmp(boolean_string, "true") == 0 ||
751 strwicmp(boolean_string, "on") == 0 ||
752 strwicmp(boolean_string, "1") == 0) {
755 } else if (strwicmp(boolean_string, "no") == 0 ||
756 strwicmp(boolean_string, "false") == 0 ||
757 strwicmp(boolean_string, "off") == 0 ||
758 strwicmp(boolean_string, "0") == 0) {
766 return the number of bytes occupied by a buffer in CH_UTF16 format
767 the result includes the null termination
769 _PUBLIC_ size_t utf16_len(const void *buf)
773 for (len = 0; SVAL(buf,len); len += 2) ;
779 return the number of bytes occupied by a buffer in CH_UTF16 format
780 the result includes the null termination
783 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
787 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
798 * @brief String utilities.
801 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
820 /* default to simple separators */
825 /* find the first non sep char, if left-trimming is requested */
827 while (*s && strchr_m(sep,*s)) {
837 /* When restarting we need to go from here. */
840 /* Work out the length needed. */
841 for (quoted = false; *s &&
842 (quoted || !strchr_m(sep,*s)); s++) {
850 /* We started with len = 1 so we have space for the nul. */
851 *pp_buff = talloc_array(ctx, char, len);
856 /* copy over the token */
859 for (quoted = false; *s &&
860 (quoted || !strchr_m(sep,*s)); s++) {
868 *ptr = (*s) ? s+1 : s;
874 bool next_token_talloc(TALLOC_CTX *ctx,
879 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
883 * Get the next token from a string, return false if none found. Handles
884 * double-quotes. This version does not trim leading separator characters
885 * before looking for a token.
888 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
893 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);