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"
28 #include "system/shmem.h"
36 #if defined(UID_WRAPPER)
37 #if !defined(UID_WRAPPER_REPLACE) && !defined(UID_WRAPPER_NOT_REPLACE)
38 #define UID_WRAPPER_REPLACE
39 #include "../uid_wrapper/uid_wrapper.h"
42 #define uwrap_enabled() 0
47 * @brief Misc utility functions
51 Find a suitable temporary directory. The result should be copied immediately
52 as it may be overwritten by a subsequent call.
54 _PUBLIC_ const char *tmpdir(void)
57 if ((p = getenv("TMPDIR")))
64 Check if a file exists - call vfs_file_exist for samba files.
66 _PUBLIC_ bool file_exist(const char *fname)
70 if (stat(fname, &st) != 0) {
74 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
78 Check a files mod time.
81 _PUBLIC_ time_t file_modtime(const char *fname)
85 if (stat(fname,&st) != 0)
92 Check if a directory exists.
95 _PUBLIC_ bool directory_exist(const char *dname)
100 if (stat(dname,&st) != 0) {
104 ret = S_ISDIR(st.st_mode);
111 * Try to create the specified directory if it didn't exist.
113 * @retval true if the directory already existed and has the right permissions
114 * or was successfully created.
116 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
122 old_umask = umask(0);
123 if (lstat(dname, &st) == -1) {
124 if (errno == ENOENT) {
125 /* Create directory */
126 if (mkdir(dname, dir_perms) == -1) {
127 DEBUG(0, ("error creating directory "
134 DEBUG(0, ("lstat failed on directory %s: %s\n",
135 dname, strerror(errno)));
140 /* Check ownership and permission on existing directory */
141 if (!S_ISDIR(st.st_mode)) {
142 DEBUG(0, ("directory %s isn't a directory\n",
147 if (st.st_uid != uid && !uwrap_enabled()) {
148 DEBUG(0, ("invalid ownership on directory "
153 if ((st.st_mode & 0777) != dir_perms) {
154 DEBUG(0, ("invalid permissions on directory "
165 Sleep for a specified number of milliseconds.
168 _PUBLIC_ void smb_msleep(unsigned int t)
170 #if defined(HAVE_NANOSLEEP)
175 ts.tv_nsec = 1000000*(t%1000);
179 ret = nanosleep(&ts, &ts);
180 } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
182 unsigned int tdiff=0;
183 struct timeval tval,t1,t2;
190 tval.tv_sec = (t-tdiff)/1000;
191 tval.tv_usec = 1000*((t-tdiff)%1000);
193 /* Never wait for more than 1 sec. */
194 if (tval.tv_sec > 1) {
201 select(0,&fds,NULL,NULL,&tval);
204 if (t2.tv_sec < t1.tv_sec) {
205 /* Someone adjusted time... */
209 tdiff = usec_time_diff(&t2,&t1)/1000;
215 Get my own name, return in talloc'ed storage.
218 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
221 char hostname[HOST_NAME_MAX];
223 /* get my host name */
224 if (gethostname(hostname, sizeof(hostname)) == -1) {
225 DEBUG(0,("gethostname failed\n"));
229 /* Ensure null termination. */
230 hostname[sizeof(hostname)-1] = '\0';
232 /* split off any parts after an initial . */
233 p = strchr_m(hostname, '.');
238 return talloc_strdup(ctx, hostname);
242 Check if a process exists. Does this work on all unixes?
245 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
247 /* Doing kill with a non-positive pid causes messages to be
248 * sent to places we don't want. */
250 return(kill(pid,0) == 0 || errno != ESRCH);
254 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
255 is dealt with in posix.c
258 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
263 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
266 lock.l_whence = SEEK_SET;
267 lock.l_start = offset;
271 ret = fcntl(fd,op,&lock);
273 if (ret == -1 && errno != 0)
274 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
279 (lock.l_type != F_UNLCK) &&
281 (lock.l_pid != getpid())) {
282 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
286 /* it must be not locked or locked by me */
290 /* a lock set or unset */
292 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
293 (double)offset,(double)count,op,type,strerror(errno)));
297 /* everything went OK */
298 DEBUG(8,("fcntl_lock: Lock call successful\n"));
303 static void debugadd_cb(const char *buf, void *private_data)
305 int *plevel = (int *)private_data;
306 DEBUGADD(*plevel, ("%s", buf));
309 void print_asc_cb(const uint8_t *buf, int len,
310 void (*cb)(const char *buf, void *private_data),
317 for (i=0; i<len; i++) {
318 s[0] = isprint(buf[i]) ? buf[i] : '.';
323 void print_asc(int level, const uint8_t *buf,int len)
325 print_asc_cb(buf, len, debugadd_cb, &level);
329 * Write dump of binary data to the log file.
331 * The data is only written if the log level is at least level.
333 static void _dump_data(int level, const uint8_t *buf, int len,
334 bool omit_zero_bytes)
337 static const uint8_t empty[16] = { 0, };
338 bool skipped = false;
342 if (!DEBUGLVL(level)) return;
347 if ((omit_zero_bytes == true) &&
350 (memcmp(&buf[i], &empty, 16) == 0))
357 DEBUGADD(level,("[%04X] ",i));
361 DEBUGADD(level,("%02X ",(int)buf[i]));
363 if (i%8 == 0) DEBUGADD(level,(" "));
366 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
367 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
369 if ((omit_zero_bytes == true) &&
371 (memcmp(&buf[i], &empty, 16) == 0)) {
373 DEBUGADD(level,("skipping zero buffer bytes\n"));
383 DEBUGADD(level,(" "));
384 if (n>8) DEBUGADD(level,(" "));
385 while (n--) DEBUGADD(level,(" "));
387 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
389 if (n>0) print_asc(level,&buf[i-n],n);
390 DEBUGADD(level,("\n"));
396 * Write dump of binary data to the log file.
398 * The data is only written if the log level is at least level.
400 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
402 _dump_data(level, buf, len, false);
406 * Write dump of binary data to the log file.
408 * The data is only written if the log level is at least level.
409 * 16 zero bytes in a row are omitted
411 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
413 _dump_data(level, buf, len, true);
418 malloc that aborts with smb_panic on fail or zero size.
421 _PUBLIC_ void *smb_xmalloc(size_t size)
425 smb_panic("smb_xmalloc: called with zero size.\n");
426 if ((p = malloc(size)) == NULL)
427 smb_panic("smb_xmalloc: malloc fail.\n");
432 Memdup with smb_panic on fail.
435 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
438 p2 = smb_xmalloc(size);
444 strdup that aborts on malloc fail.
447 char *smb_xstrdup(const char *s)
449 #if defined(PARANOID_MALLOC_CHECKER)
456 #define strdup rep_strdup
459 char *s1 = strdup(s);
460 #if defined(PARANOID_MALLOC_CHECKER)
464 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
467 smb_panic("smb_xstrdup: malloc failed");
474 strndup that aborts on malloc fail.
477 char *smb_xstrndup(const char *s, size_t n)
479 #if defined(PARANOID_MALLOC_CHECKER)
485 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
487 #define strndup rep_strndup
490 char *s1 = strndup(s, n);
491 #if defined(PARANOID_MALLOC_CHECKER)
495 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
498 smb_panic("smb_xstrndup: malloc failed");
506 Like strdup but for memory.
509 _PUBLIC_ void *memdup(const void *p, size_t size)
522 * Write a password to the log file.
524 * @note Only actually does something if DEBUG_PASSWORD was defined during
527 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
529 #ifdef DEBUG_PASSWORD
530 DEBUG(11, ("%s", msg));
531 if (data != NULL && len > 0)
533 dump_data(11, data, len);
540 * see if a range of memory is all zero. A NULL pointer is considered
543 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
546 if (!ptr) return true;
547 for (i=0;i<size;i++) {
548 if (ptr[i]) return false;
554 realloc an array, checking for integer overflow in the array size
556 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
558 #define MAX_MALLOC_SIZE 0x7fffffff
560 count >= MAX_MALLOC_SIZE/el_size) {
566 return malloc(el_size * count);
568 return realloc(ptr, el_size * count);
571 /****************************************************************************
573 ****************************************************************************/
575 void *malloc_array(size_t el_size, unsigned int count)
577 return realloc_array(NULL, el_size, count, false);
581 Trim the specified elements off the front and back of a string.
583 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
590 /* Ignore null or empty strings. */
591 if (!s || (s[0] == '\0'))
594 front_len = front? strlen(front) : 0;
595 back_len = back? strlen(back) : 0;
600 while (len && strncmp(s, front, front_len)==0) {
601 /* Must use memmove here as src & dest can
602 * easily overlap. Found by valgrind. JRA. */
603 memmove(s, s+front_len, (len-front_len)+1);
610 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
611 s[len-back_len]='\0';
620 Find the number of 'c' chars in a string
622 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
627 if (*s == c) count++;
635 Routine to get hex characters and turn them into a 16 byte array.
636 the array can be variable length, and any non-hex-numeric
637 characters are skipped. "0xnn" or "0Xnn" is specially catered
640 valid examples: "0A5D15"; "0x15, 0x49, 0xa2"; "59\ta9\te3\n"
644 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
647 size_t num_chars = 0;
648 uint8_t lonybble, hinybble;
649 const char *hexchars = "0123456789ABCDEF";
650 char *p1 = NULL, *p2 = NULL;
652 /* skip leading 0x prefix */
653 if (strncasecmp(strhex, "0x", 2) == 0) {
654 i += 2; /* skip two chars */
657 for (; i < strhex_len && strhex[i] != 0; i++) {
658 if (!(p1 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
661 i++; /* next hex digit */
663 if (!(p2 = strchr(hexchars, toupper((unsigned char)strhex[i]))))
666 /* get the two nybbles */
667 hinybble = PTR_DIFF(p1, hexchars);
668 lonybble = PTR_DIFF(p2, hexchars);
670 if (num_chars >= p_len) {
674 p[num_chars] = (hinybble << 4) | lonybble;
684 * Parse a hex string and return a data blob.
686 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
688 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
690 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
699 * Routine to print a buffer as HEX digits, into an allocated string.
701 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
706 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
707 hex_buffer = *out_hex_buffer;
709 for (i = 0; i < len; i++)
710 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
714 * talloc version of hex_encode()
716 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
721 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
726 for (i = 0; i < len; i++)
727 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
729 talloc_set_name_const(hex_buffer, hex_buffer);
734 varient of strcmp() that handles NULL ptrs
736 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
741 if (s1 == NULL || s2 == NULL) {
744 return strcmp(s1, s2);
749 return the number of bytes occupied by a buffer in ASCII format
750 the result includes the null termination
753 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
757 len = strnlen(src, n);
766 Set a boolean variable from the text value stored in the passed string.
767 Returns true in success, false if the passed string does not correctly
771 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
773 if (strwicmp(boolean_string, "yes") == 0 ||
774 strwicmp(boolean_string, "true") == 0 ||
775 strwicmp(boolean_string, "on") == 0 ||
776 strwicmp(boolean_string, "1") == 0) {
779 } else if (strwicmp(boolean_string, "no") == 0 ||
780 strwicmp(boolean_string, "false") == 0 ||
781 strwicmp(boolean_string, "off") == 0 ||
782 strwicmp(boolean_string, "0") == 0) {
790 return the number of bytes occupied by a buffer in CH_UTF16 format
791 the result includes the null termination
793 _PUBLIC_ size_t utf16_len(const void *buf)
797 for (len = 0; SVAL(buf,len); len += 2) ;
803 return the number of bytes occupied by a buffer in CH_UTF16 format
804 the result includes the null termination
807 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
811 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
822 * @brief String utilities.
825 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
844 /* default to simple separators */
849 /* find the first non sep char, if left-trimming is requested */
851 while (*s && strchr_m(sep,*s)) {
861 /* When restarting we need to go from here. */
864 /* Work out the length needed. */
865 for (quoted = false; *s &&
866 (quoted || !strchr_m(sep,*s)); s++) {
874 /* We started with len = 1 so we have space for the nul. */
875 *pp_buff = talloc_array(ctx, char, len);
880 /* copy over the token */
883 for (quoted = false; *s &&
884 (quoted || !strchr_m(sep,*s)); s++) {
892 *ptr = (*s) ? s+1 : s;
898 bool next_token_talloc(TALLOC_CTX *ctx,
903 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
907 * Get the next token from a string, return false if none found. Handles
908 * double-quotes. This version does not trim leading separator characters
909 * before looking for a token.
912 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
917 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
920 /* Map a shared memory buffer of at least nelem counters. */
921 void *allocate_anonymous_shared(size_t bufsz)
924 size_t pagesz = getpagesize();
926 if (bufsz % pagesz) {
927 bufsz = (bufsz + pagesz) % pagesz; /* round up to pagesz */
932 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
933 -1 /* fd */, 0 /* offset */);
935 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
936 open("/dev/zero", O_RDWR), 0 /* offset */);
939 if (buf == MAP_FAILED) {
948 /* used when you want a debugger started at a particular point in the
949 code. Mostly useful in code that runs as a child process, where
950 normal gdb attach is harder to organise.
952 void samba_start_debugger(void)
955 if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
958 if (system(cmd) == -1) {