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 2001-2011
7 Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003.
8 Copyright (C) James J Myers 2003
9 Copyright (C) Volker Lendecke 2010
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #include "system/network.h"
27 #include "system/filesys.h"
28 #include "system/locale.h"
29 #include "system/shmem.h"
30 #include "system/passwd.h"
40 * @brief Misc utility functions
44 Find a suitable temporary directory. The result should be copied immediately
45 as it may be overwritten by a subsequent call.
47 _PUBLIC_ const char *tmpdir(void)
50 if ((p = getenv("TMPDIR")))
57 Create a tmp file, open it and immediately unlink it.
58 If dir is NULL uses tmpdir()
59 Returns the file descriptor or -1 on error.
61 int create_unlink_tmp(const char *dir)
70 fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
80 if (unlink(fname) == -1) {
81 int sys_errno = errno;
93 Check if a file exists - call vfs_file_exist for samba files.
95 _PUBLIC_ bool file_exist(const char *fname)
99 if (stat(fname, &st) != 0) {
103 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
107 Check a files mod time.
110 _PUBLIC_ time_t file_modtime(const char *fname)
114 if (stat(fname,&st) != 0)
121 Check if a directory exists.
124 _PUBLIC_ bool directory_exist(const char *dname)
129 if (stat(dname,&st) != 0) {
133 ret = S_ISDIR(st.st_mode);
140 * Try to create the specified directory if it didn't exist.
142 * @retval true if the directory already existed and has the right permissions
143 * or was successfully created.
145 _PUBLIC_ bool directory_create_or_exist(const char *dname, uid_t uid,
151 old_umask = umask(0);
152 if (lstat(dname, &st) == -1) {
153 if (errno == ENOENT) {
154 /* Create directory */
155 if (mkdir(dname, dir_perms) == -1) {
156 DEBUG(0, ("error creating directory "
163 DEBUG(0, ("lstat failed on directory %s: %s\n",
164 dname, strerror(errno)));
169 /* Check ownership and permission on existing directory */
170 if (!S_ISDIR(st.st_mode)) {
171 DEBUG(0, ("directory %s isn't a directory\n",
176 if (st.st_uid != uid && !uwrap_enabled()) {
177 DEBUG(0, ("invalid ownership on directory "
182 if ((st.st_mode & 0777) != dir_perms) {
183 DEBUG(0, ("invalid permissions on directory "
184 "'%s': has 0%o should be 0%o\n", dname,
185 (st.st_mode & 0777), dir_perms));
195 Sleep for a specified number of milliseconds.
198 _PUBLIC_ void smb_msleep(unsigned int t)
200 #if defined(HAVE_NANOSLEEP)
205 ts.tv_nsec = 1000000*(t%1000);
209 ret = nanosleep(&ts, &ts);
210 } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
212 unsigned int tdiff=0;
213 struct timeval tval,t1,t2;
220 tval.tv_sec = (t-tdiff)/1000;
221 tval.tv_usec = 1000*((t-tdiff)%1000);
223 /* Never wait for more than 1 sec. */
224 if (tval.tv_sec > 1) {
231 select(0,&fds,NULL,NULL,&tval);
234 if (t2.tv_sec < t1.tv_sec) {
235 /* Someone adjusted time... */
239 tdiff = usec_time_diff(&t2,&t1)/1000;
245 Get my own name, return in talloc'ed storage.
248 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
251 char hostname[HOST_NAME_MAX];
253 /* get my host name */
254 if (gethostname(hostname, sizeof(hostname)) == -1) {
255 DEBUG(0,("gethostname failed\n"));
259 /* Ensure null termination. */
260 hostname[sizeof(hostname)-1] = '\0';
262 /* split off any parts after an initial . */
263 p = strchr_m(hostname, '.');
268 return talloc_strdup(ctx, hostname);
272 Check if a process exists. Does this work on all unixes?
275 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
277 /* Doing kill with a non-positive pid causes messages to be
278 * sent to places we don't want. */
280 return(kill(pid,0) == 0 || errno != ESRCH);
284 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
285 is dealt with in posix.c
288 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
293 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
296 lock.l_whence = SEEK_SET;
297 lock.l_start = offset;
301 ret = fcntl(fd,op,&lock);
303 if (ret == -1 && errno != 0)
304 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
309 (lock.l_type != F_UNLCK) &&
311 (lock.l_pid != getpid())) {
312 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
316 /* it must be not locked or locked by me */
320 /* a lock set or unset */
322 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
323 (double)offset,(double)count,op,type,strerror(errno)));
327 /* everything went OK */
328 DEBUG(8,("fcntl_lock: Lock call successful\n"));
333 static void debugadd_cb(const char *buf, void *private_data)
335 int *plevel = (int *)private_data;
336 DEBUGADD(*plevel, ("%s", buf));
339 void print_asc_cb(const uint8_t *buf, int len,
340 void (*cb)(const char *buf, void *private_data),
347 for (i=0; i<len; i++) {
348 s[0] = isprint(buf[i]) ? buf[i] : '.';
353 void print_asc(int level, const uint8_t *buf,int len)
355 print_asc_cb(buf, len, debugadd_cb, &level);
359 * Write dump of binary data to a callback
361 void dump_data_cb(const uint8_t *buf, int len,
362 bool omit_zero_bytes,
363 void (*cb)(const char *buf, void *private_data),
367 static const uint8_t empty[16] = { 0, };
368 bool skipped = false;
376 if ((omit_zero_bytes == true) &&
379 (memcmp(&buf[i], &empty, 16) == 0))
386 snprintf(tmp, sizeof(tmp), "[%04X] ", i);
387 cb(tmp, private_data);
391 snprintf(tmp, sizeof(tmp), "%02X ", (int)buf[i]);
392 cb(tmp, private_data);
395 cb(" ", private_data);
399 print_asc_cb(&buf[i-16], 8, cb, private_data);
400 cb(" ", private_data);
401 print_asc_cb(&buf[i-8], 8, cb, private_data);
402 cb("\n", private_data);
404 if ((omit_zero_bytes == true) &&
406 (memcmp(&buf[i], &empty, 16) == 0)) {
408 cb("skipping zero buffer bytes\n",
419 cb(" ", private_data);
421 cb(" ", private_data);
424 cb(" ", private_data);
427 print_asc_cb(&buf[i-(i%16)], n, cb, private_data);
428 cb(" ", private_data);
431 print_asc_cb(&buf[i-n], n, cb, private_data);
433 cb("\n", private_data);
439 * Write dump of binary data to the log file.
441 * The data is only written if the log level is at least level.
443 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
445 if (!DEBUGLVL(level)) {
448 dump_data_cb(buf, len, false, debugadd_cb, &level);
452 * Write dump of binary data to the log file.
454 * The data is only written if the log level is at least level.
455 * 16 zero bytes in a row are omitted
457 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
459 if (!DEBUGLVL(level)) {
462 dump_data_cb(buf, len, true, debugadd_cb, &level);
467 malloc that aborts with smb_panic on fail or zero size.
470 _PUBLIC_ void *smb_xmalloc(size_t size)
474 smb_panic("smb_xmalloc: called with zero size.\n");
475 if ((p = malloc(size)) == NULL)
476 smb_panic("smb_xmalloc: malloc fail.\n");
481 Memdup with smb_panic on fail.
484 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
487 p2 = smb_xmalloc(size);
493 strdup that aborts on malloc fail.
496 char *smb_xstrdup(const char *s)
498 #if defined(PARANOID_MALLOC_CHECKER)
505 #define strdup rep_strdup
508 char *s1 = strdup(s);
509 #if defined(PARANOID_MALLOC_CHECKER)
513 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
516 smb_panic("smb_xstrdup: malloc failed");
523 strndup that aborts on malloc fail.
526 char *smb_xstrndup(const char *s, size_t n)
528 #if defined(PARANOID_MALLOC_CHECKER)
534 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
536 #define strndup rep_strndup
539 char *s1 = strndup(s, n);
540 #if defined(PARANOID_MALLOC_CHECKER)
544 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
547 smb_panic("smb_xstrndup: malloc failed");
555 Like strdup but for memory.
558 _PUBLIC_ void *memdup(const void *p, size_t size)
571 * Write a password to the log file.
573 * @note Only actually does something if DEBUG_PASSWORD was defined during
576 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
578 #ifdef DEBUG_PASSWORD
579 DEBUG(11, ("%s", msg));
580 if (data != NULL && len > 0)
582 dump_data(11, data, len);
589 * see if a range of memory is all zero. A NULL pointer is considered
592 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
595 if (!ptr) return true;
596 for (i=0;i<size;i++) {
597 if (ptr[i]) return false;
603 realloc an array, checking for integer overflow in the array size
605 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
607 #define MAX_MALLOC_SIZE 0x7fffffff
609 count >= MAX_MALLOC_SIZE/el_size) {
615 return malloc(el_size * count);
617 return realloc(ptr, el_size * count);
620 /****************************************************************************
622 ****************************************************************************/
624 void *malloc_array(size_t el_size, unsigned int count)
626 return realloc_array(NULL, el_size, count, false);
630 Trim the specified elements off the front and back of a string.
632 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
639 /* Ignore null or empty strings. */
640 if (!s || (s[0] == '\0'))
643 front_len = front? strlen(front) : 0;
644 back_len = back? strlen(back) : 0;
649 while (len && strncmp(s, front, front_len)==0) {
650 /* Must use memmove here as src & dest can
651 * easily overlap. Found by valgrind. JRA. */
652 memmove(s, s+front_len, (len-front_len)+1);
659 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
660 s[len-back_len]='\0';
669 Find the number of 'c' chars in a string
671 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
676 if (*s == c) count++;
684 * Routine to get hex characters and turn them into a byte array.
685 * the array can be variable length.
686 * - "0xnn" or "0Xnn" is specially catered for.
687 * - The first non-hex-digit character (apart from possibly leading "0x"
688 * finishes the conversion and skips the rest of the input.
689 * - A single hex-digit character at the end of the string is skipped.
691 * valid examples: "0A5D15"; "0x123456"
693 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
696 size_t num_chars = 0;
697 uint8_t lonybble, hinybble;
698 const char *hexchars = "0123456789ABCDEF";
699 char *p1 = NULL, *p2 = NULL;
701 /* skip leading 0x prefix */
702 if (strncasecmp(strhex, "0x", 2) == 0) {
703 i += 2; /* skip two chars */
706 for (; i+1 < strhex_len && strhex[i] != 0 && strhex[i+1] != 0; i++) {
707 p1 = strchr(hexchars, toupper((unsigned char)strhex[i]));
712 i++; /* next hex digit */
714 p2 = strchr(hexchars, toupper((unsigned char)strhex[i]));
719 /* get the two nybbles */
720 hinybble = PTR_DIFF(p1, hexchars);
721 lonybble = PTR_DIFF(p2, hexchars);
723 if (num_chars >= p_len) {
727 p[num_chars] = (hinybble << 4) | lonybble;
737 * Parse a hex string and return a data blob.
739 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
741 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
743 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
752 * Routine to print a buffer as HEX digits, into an allocated string.
754 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
759 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
760 hex_buffer = *out_hex_buffer;
762 for (i = 0; i < len; i++)
763 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
767 * talloc version of hex_encode()
769 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
774 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
779 for (i = 0; i < len; i++)
780 slprintf(&hex_buffer[i*2], 3, "%02X", buff_in[i]);
782 talloc_set_name_const(hex_buffer, hex_buffer);
787 varient of strcmp() that handles NULL ptrs
789 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
794 if (s1 == NULL || s2 == NULL) {
797 return strcmp(s1, s2);
802 return the number of bytes occupied by a buffer in ASCII format
803 the result includes the null termination
806 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
810 len = strnlen(src, n);
819 Set a boolean variable from the text value stored in the passed string.
820 Returns true in success, false if the passed string does not correctly
824 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
826 if (strwicmp(boolean_string, "yes") == 0 ||
827 strwicmp(boolean_string, "true") == 0 ||
828 strwicmp(boolean_string, "on") == 0 ||
829 strwicmp(boolean_string, "1") == 0) {
832 } else if (strwicmp(boolean_string, "no") == 0 ||
833 strwicmp(boolean_string, "false") == 0 ||
834 strwicmp(boolean_string, "off") == 0 ||
835 strwicmp(boolean_string, "0") == 0) {
843 return the number of bytes occupied by a buffer in CH_UTF16 format
844 the result includes the null termination
846 _PUBLIC_ size_t utf16_len(const void *buf)
850 for (len = 0; SVAL(buf,len); len += 2) ;
856 return the number of bytes occupied by a buffer in CH_UTF16 format
857 the result includes the null termination
860 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
864 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
875 * @brief String utilities.
878 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
897 /* default to simple separators */
902 /* find the first non sep char, if left-trimming is requested */
904 while (*s && strchr_m(sep,*s)) {
914 /* When restarting we need to go from here. */
917 /* Work out the length needed. */
918 for (quoted = false; *s &&
919 (quoted || !strchr_m(sep,*s)); s++) {
927 /* We started with len = 1 so we have space for the nul. */
928 *pp_buff = talloc_array(ctx, char, len);
933 /* copy over the token */
936 for (quoted = false; *s &&
937 (quoted || !strchr_m(sep,*s)); s++) {
945 *ptr = (*s) ? s+1 : s;
951 bool next_token_talloc(TALLOC_CTX *ctx,
956 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
960 * Get the next token from a string, return false if none found. Handles
961 * double-quotes. This version does not trim leading separator characters
962 * before looking for a token.
965 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
970 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
974 * Get the next token from a string, return False if none found.
975 * Handles double-quotes.
977 * Based on a routine by GJC@VILLAGE.COM.
978 * Extensively modified by Andrew.Tridgell@anu.edu.au
980 _PUBLIC_ bool next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
991 /* default to simple separators */
995 /* find the first non sep char */
996 while (*s && strchr_m(sep,*s))
1003 /* copy over the token */
1004 for (quoted = false; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
1013 *ptr = (*s) ? s+1 : s;
1019 struct anonymous_shared_header {
1026 /* Map a shared memory buffer of at least nelem counters. */
1027 void *anonymous_shared_allocate(size_t orig_bufsz)
1031 size_t pagesz = getpagesize();
1033 size_t bufsz = orig_bufsz;
1034 struct anonymous_shared_header *hdr;
1036 bufsz += sizeof(*hdr);
1038 /* round up to full pages */
1039 pagecnt = bufsz / pagesz;
1040 if (bufsz % pagesz) {
1043 bufsz = pagesz * pagecnt;
1045 if (orig_bufsz >= bufsz) {
1053 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
1054 -1 /* fd */, 0 /* offset */);
1056 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
1057 open("/dev/zero", O_RDWR), 0 /* offset */);
1060 if (buf == MAP_FAILED) {
1064 hdr = (struct anonymous_shared_header *)buf;
1065 hdr->u.length = bufsz;
1067 ptr = (void *)(&hdr[1]);
1072 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove)
1076 size_t pagesz = getpagesize();
1079 struct anonymous_shared_header *hdr;
1087 hdr = (struct anonymous_shared_header *)ptr;
1089 if (hdr->u.length > (new_size + sizeof(*hdr))) {
1094 bufsz = new_size + sizeof(*hdr);
1096 /* round up to full pages */
1097 pagecnt = bufsz / pagesz;
1098 if (bufsz % pagesz) {
1101 bufsz = pagesz * pagecnt;
1103 if (new_size >= bufsz) {
1109 if (bufsz <= hdr->u.length) {
1114 flags = MREMAP_MAYMOVE;
1117 buf = mremap(hdr, hdr->u.length, bufsz, flags);
1119 if (buf == MAP_FAILED) {
1124 hdr = (struct anonymous_shared_header *)buf;
1125 hdr->u.length = bufsz;
1127 ptr = (void *)(&hdr[1]);
1136 void anonymous_shared_free(void *ptr)
1138 struct anonymous_shared_header *hdr;
1144 hdr = (struct anonymous_shared_header *)ptr;
1148 munmap(hdr, hdr->u.length);
1152 /* used when you want a debugger started at a particular point in the
1153 code. Mostly useful in code that runs as a child process, where
1154 normal gdb attach is harder to organise.
1156 void samba_start_debugger(void)
1159 if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
1162 if (system(cmd) == -1) {