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"
41 * @brief Misc utility functions
45 Find a suitable temporary directory. The result should be copied immediately
46 as it may be overwritten by a subsequent call.
48 _PUBLIC_ const char *tmpdir(void)
51 if ((p = getenv("TMPDIR")))
58 Create a tmp file, open it and immediately unlink it.
59 If dir is NULL uses tmpdir()
60 Returns the file descriptor or -1 on error.
62 int create_unlink_tmp(const char *dir)
71 fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
81 if (unlink(fname) == -1) {
82 int sys_errno = errno;
94 Check if a file exists - call vfs_file_exist for samba files.
96 _PUBLIC_ bool file_exist(const char *fname)
100 if (stat(fname, &st) != 0) {
104 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
108 Check a files mod time.
111 _PUBLIC_ time_t file_modtime(const char *fname)
115 if (stat(fname,&st) != 0)
122 Check if a directory exists.
125 _PUBLIC_ bool directory_exist(const char *dname)
130 if (stat(dname,&st) != 0) {
134 ret = S_ISDIR(st.st_mode);
141 * Try to create the specified directory if it didn't exist.
143 * @retval true if the directory already existed and has the right permissions
144 * or was successfully created.
146 _PUBLIC_ bool directory_create_or_exist(const char *dname,
153 ret = lstat(dname, &st);
157 if (errno != ENOENT) {
158 DEBUG(0, ("lstat failed on directory %s: %s\n",
159 dname, strerror(errno)));
163 /* Create directory */
164 old_umask = umask(0);
165 ret = mkdir(dname, dir_perms);
166 if (ret == -1 && errno != EEXIST) {
167 DEBUG(0, ("mkdir failed on directory "
175 ret = lstat(dname, &st);
177 DEBUG(0, ("lstat failed on created directory %s: %s\n",
178 dname, strerror(errno)));
187 * @brief Try to create a specified directory if it doesn't exist.
189 * The function creates a directory with the given uid and permissions if it
190 * doesn't exixt. If it exists it makes sure the uid and permissions are
191 * correct and it will fail if they are different.
193 * @param[in] dname The directory to create.
195 * @param[in] uid The uid the directory needs to belong too.
197 * @param[in] dir_perms The expected permissions of the directory.
199 * @return True on success, false on error.
201 _PUBLIC_ bool directory_create_or_exist_strict(const char *dname,
209 ok = directory_create_or_exist(dname, uid, dir_perms);
214 rc = lstat(dname, &st);
216 DEBUG(0, ("lstat failed on created directory %s: %s\n",
217 dname, strerror(errno)));
221 /* Check ownership and permission on existing directory */
222 if (!S_ISDIR(st.st_mode)) {
223 DEBUG(0, ("directory %s isn't a directory\n",
227 if (st.st_uid != uid && !uwrap_enabled()) {
228 DEBUG(0, ("invalid ownership on directory "
232 if ((st.st_mode & 0777) != dir_perms) {
233 DEBUG(0, ("invalid permissions on directory "
234 "'%s': has 0%o should be 0%o\n", dname,
235 (st.st_mode & 0777), dir_perms));
244 Sleep for a specified number of milliseconds.
247 _PUBLIC_ void smb_msleep(unsigned int t)
249 #if defined(HAVE_NANOSLEEP)
254 ts.tv_nsec = 1000000*(t%1000);
258 ret = nanosleep(&ts, &ts);
259 } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
261 unsigned int tdiff=0;
262 struct timeval tval,t1,t2;
269 tval.tv_sec = (t-tdiff)/1000;
270 tval.tv_usec = 1000*((t-tdiff)%1000);
272 /* Never wait for more than 1 sec. */
273 if (tval.tv_sec > 1) {
280 select(0,&fds,NULL,NULL,&tval);
283 if (t2.tv_sec < t1.tv_sec) {
284 /* Someone adjusted time... */
288 tdiff = usec_time_diff(&t2,&t1)/1000;
294 Get my own name, return in talloc'ed storage.
297 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
300 char hostname[HOST_NAME_MAX];
302 /* get my host name */
303 if (gethostname(hostname, sizeof(hostname)) == -1) {
304 DEBUG(0,("gethostname failed\n"));
308 /* Ensure null termination. */
309 hostname[sizeof(hostname)-1] = '\0';
311 /* split off any parts after an initial . */
312 p = strchr_m(hostname, '.');
317 return talloc_strdup(ctx, hostname);
321 Check if a process exists. Does this work on all unixes?
324 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
326 /* Doing kill with a non-positive pid causes messages to be
327 * sent to places we don't want. */
331 return(kill(pid,0) == 0 || errno != ESRCH);
335 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
336 is dealt with in posix.c
339 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
344 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
347 lock.l_whence = SEEK_SET;
348 lock.l_start = offset;
352 ret = fcntl(fd,op,&lock);
354 if (ret == -1 && errno != 0)
355 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
360 (lock.l_type != F_UNLCK) &&
362 (lock.l_pid != getpid())) {
363 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
367 /* it must be not locked or locked by me */
371 /* a lock set or unset */
373 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
374 (double)offset,(double)count,op,type,strerror(errno)));
378 /* everything went OK */
379 DEBUG(8,("fcntl_lock: Lock call successful\n"));
384 static void debugadd_cb(const char *buf, void *private_data)
386 int *plevel = (int *)private_data;
387 DEBUGADD(*plevel, ("%s", buf));
390 void print_asc_cb(const uint8_t *buf, int len,
391 void (*cb)(const char *buf, void *private_data),
398 for (i=0; i<len; i++) {
399 s[0] = isprint(buf[i]) ? buf[i] : '.';
404 void print_asc(int level, const uint8_t *buf,int len)
406 print_asc_cb(buf, len, debugadd_cb, &level);
410 * Write dump of binary data to a callback
412 void dump_data_cb(const uint8_t *buf, int len,
413 bool omit_zero_bytes,
414 void (*cb)(const char *buf, void *private_data),
418 static const uint8_t empty[16] = { 0, };
419 bool skipped = false;
427 if ((omit_zero_bytes == true) &&
430 (memcmp(&buf[i], &empty, 16) == 0))
437 snprintf(tmp, sizeof(tmp), "[%04X] ", i);
438 cb(tmp, private_data);
442 snprintf(tmp, sizeof(tmp), "%02X ", (int)buf[i]);
443 cb(tmp, private_data);
446 cb(" ", private_data);
450 print_asc_cb(&buf[i-16], 8, cb, private_data);
451 cb(" ", private_data);
452 print_asc_cb(&buf[i-8], 8, cb, private_data);
453 cb("\n", private_data);
455 if ((omit_zero_bytes == true) &&
457 (memcmp(&buf[i], &empty, 16) == 0)) {
459 cb("skipping zero buffer bytes\n",
470 cb(" ", private_data);
472 cb(" ", private_data);
475 cb(" ", private_data);
478 print_asc_cb(&buf[i-(i%16)], n, cb, private_data);
479 cb(" ", private_data);
482 print_asc_cb(&buf[i-n], n, cb, private_data);
484 cb("\n", private_data);
490 * Write dump of binary data to the log file.
492 * The data is only written if the log level is at least level.
494 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
496 if (!DEBUGLVL(level)) {
499 dump_data_cb(buf, len, false, debugadd_cb, &level);
503 * Write dump of binary data to the log file.
505 * The data is only written if the log level is at least level.
506 * 16 zero bytes in a row are omitted
508 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
510 if (!DEBUGLVL(level)) {
513 dump_data_cb(buf, len, true, debugadd_cb, &level);
516 static void fprintf_cb(const char *buf, void *private_data)
518 FILE *f = (FILE *)private_data;
519 fprintf(f, "%s", buf);
522 void dump_data_file(const uint8_t *buf, int len, bool omit_zero_bytes,
525 dump_data_cb(buf, len, omit_zero_bytes, fprintf_cb, f);
529 malloc that aborts with smb_panic on fail or zero size.
532 _PUBLIC_ void *smb_xmalloc(size_t size)
536 smb_panic("smb_xmalloc: called with zero size.\n");
537 if ((p = malloc(size)) == NULL)
538 smb_panic("smb_xmalloc: malloc fail.\n");
543 Memdup with smb_panic on fail.
546 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
549 p2 = smb_xmalloc(size);
555 strdup that aborts on malloc fail.
558 char *smb_xstrdup(const char *s)
560 #if defined(PARANOID_MALLOC_CHECKER)
567 #define strdup rep_strdup
570 char *s1 = strdup(s);
571 #if defined(PARANOID_MALLOC_CHECKER)
575 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
578 smb_panic("smb_xstrdup: malloc failed");
585 strndup that aborts on malloc fail.
588 char *smb_xstrndup(const char *s, size_t n)
590 #if defined(PARANOID_MALLOC_CHECKER)
596 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
598 #define strndup rep_strndup
601 char *s1 = strndup(s, n);
602 #if defined(PARANOID_MALLOC_CHECKER)
606 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
609 smb_panic("smb_xstrndup: malloc failed");
617 Like strdup but for memory.
620 _PUBLIC_ void *memdup(const void *p, size_t size)
633 * Write a password to the log file.
635 * @note Only actually does something if DEBUG_PASSWORD was defined during
638 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
640 #ifdef DEBUG_PASSWORD
641 DEBUG(11, ("%s", msg));
642 if (data != NULL && len > 0)
644 dump_data(11, data, len);
651 * see if a range of memory is all zero. A NULL pointer is considered
654 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
657 if (!ptr) return true;
658 for (i=0;i<size;i++) {
659 if (ptr[i]) return false;
665 realloc an array, checking for integer overflow in the array size
667 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
669 #define MAX_MALLOC_SIZE 0x7fffffff
671 count >= MAX_MALLOC_SIZE/el_size) {
677 return malloc(el_size * count);
679 return realloc(ptr, el_size * count);
682 /****************************************************************************
684 ****************************************************************************/
686 void *malloc_array(size_t el_size, unsigned int count)
688 return realloc_array(NULL, el_size, count, false);
691 /****************************************************************************
693 ****************************************************************************/
695 void *memalign_array(size_t el_size, size_t align, unsigned int count)
697 if (count*el_size >= MAX_MALLOC_SIZE) {
701 return memalign(align, el_size*count);
704 /****************************************************************************
706 ****************************************************************************/
708 void *calloc_array(size_t size, size_t nmemb)
710 if (nmemb >= MAX_MALLOC_SIZE/size) {
713 if (size == 0 || nmemb == 0) {
716 return calloc(nmemb, size);
720 Trim the specified elements off the front and back of a string.
722 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
729 /* Ignore null or empty strings. */
730 if (!s || (s[0] == '\0'))
733 front_len = front? strlen(front) : 0;
734 back_len = back? strlen(back) : 0;
739 while (len && strncmp(s, front, front_len)==0) {
740 /* Must use memmove here as src & dest can
741 * easily overlap. Found by valgrind. JRA. */
742 memmove(s, s+front_len, (len-front_len)+1);
749 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
750 s[len-back_len]='\0';
759 Find the number of 'c' chars in a string
761 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
766 if (*s == c) count++;
774 * Routine to get hex characters and turn them into a byte array.
775 * the array can be variable length.
776 * - "0xnn" or "0Xnn" is specially catered for.
777 * - The first non-hex-digit character (apart from possibly leading "0x"
778 * finishes the conversion and skips the rest of the input.
779 * - A single hex-digit character at the end of the string is skipped.
781 * valid examples: "0A5D15"; "0x123456"
783 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
786 size_t num_chars = 0;
787 uint8_t lonybble, hinybble;
788 const char *hexchars = "0123456789ABCDEF";
789 char *p1 = NULL, *p2 = NULL;
791 /* skip leading 0x prefix */
792 if (strncasecmp(strhex, "0x", 2) == 0) {
793 i += 2; /* skip two chars */
796 for (; i+1 < strhex_len && strhex[i] != 0 && strhex[i+1] != 0; i++) {
797 p1 = strchr(hexchars, toupper((unsigned char)strhex[i]));
802 i++; /* next hex digit */
804 p2 = strchr(hexchars, toupper((unsigned char)strhex[i]));
809 /* get the two nybbles */
810 hinybble = PTR_DIFF(p1, hexchars);
811 lonybble = PTR_DIFF(p2, hexchars);
813 if (num_chars >= p_len) {
817 p[num_chars] = (hinybble << 4) | lonybble;
827 * Parse a hex string and return a data blob.
829 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
831 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
833 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
841 * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
843 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen)
846 for (i=0; i<srclen; i++) {
847 snprintf(dst + i*2, 3, "%02X", src[i]);
850 * Ensure 0-termination for 0-length buffers
852 dst[srclen*2] = '\0';
856 * Routine to print a buffer as HEX digits, into an allocated string.
858 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
862 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
863 hex_buffer = *out_hex_buffer;
864 hex_encode_buf(hex_buffer, buff_in, len);
868 * talloc version of hex_encode()
870 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
874 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
878 hex_encode_buf(hex_buffer, buff_in, len);
879 talloc_set_name_const(hex_buffer, hex_buffer);
884 varient of strcmp() that handles NULL ptrs
886 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
891 if (s1 == NULL || s2 == NULL) {
894 return strcmp(s1, s2);
899 return the number of bytes occupied by a buffer in ASCII format
900 the result includes the null termination
903 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
907 len = strnlen(src, n);
916 Set a boolean variable from the text value stored in the passed string.
917 Returns true in success, false if the passed string does not correctly
921 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
923 if (strwicmp(boolean_string, "yes") == 0 ||
924 strwicmp(boolean_string, "true") == 0 ||
925 strwicmp(boolean_string, "on") == 0 ||
926 strwicmp(boolean_string, "1") == 0) {
929 } else if (strwicmp(boolean_string, "no") == 0 ||
930 strwicmp(boolean_string, "false") == 0 ||
931 strwicmp(boolean_string, "off") == 0 ||
932 strwicmp(boolean_string, "0") == 0) {
940 return the number of bytes occupied by a buffer in CH_UTF16 format
941 the result includes the null termination
943 _PUBLIC_ size_t utf16_len(const void *buf)
947 for (len = 0; SVAL(buf,len); len += 2) ;
953 return the number of bytes occupied by a buffer in CH_UTF16 format
954 the result includes the null termination
957 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
961 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
972 * @brief String utilities.
975 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
994 /* default to simple separators */
999 /* find the first non sep char, if left-trimming is requested */
1001 while (*s && strchr_m(sep,*s)) {
1011 /* When restarting we need to go from here. */
1014 /* Work out the length needed. */
1015 for (quoted = false; *s &&
1016 (quoted || !strchr_m(sep,*s)); s++) {
1024 /* We started with len = 1 so we have space for the nul. */
1025 *pp_buff = talloc_array(ctx, char, len);
1030 /* copy over the token */
1033 for (quoted = false; *s &&
1034 (quoted || !strchr_m(sep,*s)); s++) {
1042 *ptr = (*s) ? s+1 : s;
1048 bool next_token_talloc(TALLOC_CTX *ctx,
1053 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
1057 * Get the next token from a string, return false if none found. Handles
1058 * double-quotes. This version does not trim leading separator characters
1059 * before looking for a token.
1062 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
1067 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
1071 * Get the next token from a string, return False if none found.
1072 * Handles double-quotes.
1074 * Based on a routine by GJC@VILLAGE.COM.
1075 * Extensively modified by Andrew.Tridgell@anu.edu.au
1077 _PUBLIC_ bool next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
1088 /* default to simple separators */
1092 /* find the first non sep char */
1093 while (*s && strchr_m(sep,*s))
1100 /* copy over the token */
1101 for (quoted = false; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
1110 *ptr = (*s) ? s+1 : s;
1116 struct anonymous_shared_header {
1123 /* Map a shared memory buffer of at least nelem counters. */
1124 void *anonymous_shared_allocate(size_t orig_bufsz)
1128 size_t pagesz = getpagesize();
1130 size_t bufsz = orig_bufsz;
1131 struct anonymous_shared_header *hdr;
1133 bufsz += sizeof(*hdr);
1135 /* round up to full pages */
1136 pagecnt = bufsz / pagesz;
1137 if (bufsz % pagesz) {
1140 bufsz = pagesz * pagecnt;
1142 if (orig_bufsz >= bufsz) {
1150 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
1151 -1 /* fd */, 0 /* offset */);
1157 fd = open("/dev/zero", O_RDWR);
1162 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
1163 fd, 0 /* offset */);
1164 saved_errno = errno;
1166 errno = saved_errno;
1170 if (buf == MAP_FAILED) {
1174 hdr = (struct anonymous_shared_header *)buf;
1175 hdr->u.length = bufsz;
1177 ptr = (void *)(&hdr[1]);
1182 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove)
1186 size_t pagesz = getpagesize();
1189 struct anonymous_shared_header *hdr;
1197 hdr = (struct anonymous_shared_header *)ptr;
1199 if (hdr->u.length > (new_size + sizeof(*hdr))) {
1204 bufsz = new_size + sizeof(*hdr);
1206 /* round up to full pages */
1207 pagecnt = bufsz / pagesz;
1208 if (bufsz % pagesz) {
1211 bufsz = pagesz * pagecnt;
1213 if (new_size >= bufsz) {
1219 if (bufsz <= hdr->u.length) {
1224 flags = MREMAP_MAYMOVE;
1227 buf = mremap(hdr, hdr->u.length, bufsz, flags);
1229 if (buf == MAP_FAILED) {
1234 hdr = (struct anonymous_shared_header *)buf;
1235 hdr->u.length = bufsz;
1237 ptr = (void *)(&hdr[1]);
1246 void anonymous_shared_free(void *ptr)
1248 struct anonymous_shared_header *hdr;
1254 hdr = (struct anonymous_shared_header *)ptr;
1258 munmap(hdr, hdr->u.length);
1262 /* used when you want a debugger started at a particular point in the
1263 code. Mostly useful in code that runs as a child process, where
1264 normal gdb attach is harder to organise.
1266 void samba_start_debugger(void)
1269 if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
1272 if (system(cmd) == -1) {