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)
72 fname = talloc_asprintf(talloc_tos(), "%s/listenerlock_XXXXXX", dir);
77 mask = umask(S_IRWXO | S_IRWXG);
84 if (unlink(fname) == -1) {
85 int sys_errno = errno;
97 Check if a file exists - call vfs_file_exist for samba files.
99 _PUBLIC_ bool file_exist(const char *fname)
103 if (stat(fname, &st) != 0) {
107 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
111 Check a files mod time.
114 _PUBLIC_ time_t file_modtime(const char *fname)
118 if (stat(fname,&st) != 0)
125 Check file permissions.
128 _PUBLIC_ bool file_check_permissions(const char *fname,
142 ret = stat(fname, pst);
144 DEBUG(0, ("stat failed on file '%s': %s\n",
145 fname, strerror(errno)));
149 if (pst->st_uid != uid && !uid_wrapper_enabled()) {
150 DEBUG(0, ("invalid ownership of file '%s': "
151 "owned by uid %u, should be %u\n",
152 fname, (unsigned int)pst->st_uid,
157 if ((pst->st_mode & 0777) != file_perms) {
158 DEBUG(0, ("invalid permissions on file "
159 "'%s': has 0%o should be 0%o\n", fname,
160 (unsigned int)(pst->st_mode & 0777),
161 (unsigned int)file_perms));
169 Check if a directory exists.
172 _PUBLIC_ bool directory_exist(const char *dname)
177 if (stat(dname,&st) != 0) {
181 ret = S_ISDIR(st.st_mode);
188 * Try to create the specified directory if it didn't exist.
190 * @retval true if the directory already existed and has the right permissions
191 * or was successfully created.
193 _PUBLIC_ bool directory_create_or_exist(const char *dname,
201 ret = lstat(dname, &st);
206 if (errno != ENOENT) {
207 DEBUG(0, ("lstat failed on directory %s: %s\n",
208 dname, strerror(errno)));
212 /* Create directory */
213 old_umask = umask(0);
214 ret = mkdir(dname, dir_perms);
215 if (ret == -1 && errno != EEXIST) {
216 DEBUG(0, ("mkdir failed on directory "
224 ret = lstat(dname, &st);
226 DEBUG(0, ("lstat failed on created directory %s: %s\n",
227 dname, strerror(errno)));
235 * @brief Try to create a specified directory if it doesn't exist.
237 * The function creates a directory with the given uid and permissions if it
238 * doesn't exist. If it exists it makes sure the uid and permissions are
239 * correct and it will fail if they are different.
241 * @param[in] dname The directory to create.
243 * @param[in] uid The uid the directory needs to belong too.
245 * @param[in] dir_perms The expected permissions of the directory.
247 * @return True on success, false on error.
249 _PUBLIC_ bool directory_create_or_exist_strict(const char *dname,
257 ok = directory_create_or_exist(dname, uid, dir_perms);
262 rc = lstat(dname, &st);
264 DEBUG(0, ("lstat failed on created directory %s: %s\n",
265 dname, strerror(errno)));
269 /* Check ownership and permission on existing directory */
270 if (!S_ISDIR(st.st_mode)) {
271 DEBUG(0, ("directory %s isn't a directory\n",
275 if (st.st_uid != uid && !uid_wrapper_enabled()) {
276 DEBUG(0, ("invalid ownership on directory "
280 if ((st.st_mode & 0777) != dir_perms) {
281 DEBUG(0, ("invalid permissions on directory "
282 "'%s': has 0%o should be 0%o\n", dname,
283 (unsigned int)(st.st_mode & 0777), (unsigned int)dir_perms));
292 Sleep for a specified number of milliseconds.
295 _PUBLIC_ void smb_msleep(unsigned int t)
297 #if defined(HAVE_NANOSLEEP)
302 ts.tv_nsec = 1000000*(t%1000);
306 ret = nanosleep(&ts, &ts);
307 } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
309 unsigned int tdiff=0;
310 struct timeval tval,t1,t2;
317 tval.tv_sec = (t-tdiff)/1000;
318 tval.tv_usec = 1000*((t-tdiff)%1000);
320 /* Never wait for more than 1 sec. */
321 if (tval.tv_sec > 1) {
328 select(0,&fds,NULL,NULL,&tval);
331 if (t2.tv_sec < t1.tv_sec) {
332 /* Someone adjusted time... */
336 tdiff = usec_time_diff(&t2,&t1)/1000;
342 Get my own name, return in talloc'ed storage.
345 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
348 char hostname[HOST_NAME_MAX];
350 /* get my host name */
351 if (gethostname(hostname, sizeof(hostname)) == -1) {
352 DEBUG(0,("gethostname failed\n"));
356 /* Ensure null termination. */
357 hostname[sizeof(hostname)-1] = '\0';
359 /* split off any parts after an initial . */
360 p = strchr_m(hostname, '.');
365 return talloc_strdup(ctx, hostname);
369 Check if a process exists. Does this work on all unixes?
372 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
374 /* Doing kill with a non-positive pid causes messages to be
375 * sent to places we don't want. */
379 return(kill(pid,0) == 0 || errno != ESRCH);
383 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
384 is dealt with in posix.c
387 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
392 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
395 lock.l_whence = SEEK_SET;
396 lock.l_start = offset;
400 ret = fcntl(fd,op,&lock);
402 if (ret == -1 && errno != 0)
403 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
408 (lock.l_type != F_UNLCK) &&
410 (lock.l_pid != getpid())) {
411 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
415 /* it must be not locked or locked by me */
419 /* a lock set or unset */
421 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
422 (double)offset,(double)count,op,type,strerror(errno)));
426 /* everything went OK */
427 DEBUG(8,("fcntl_lock: Lock call successful\n"));
432 struct debug_channel_level {
437 static void debugadd_channel_cb(const char *buf, void *private_data)
439 struct debug_channel_level *dcl =
440 (struct debug_channel_level *)private_data;
442 DEBUGADDC(dcl->channel, dcl->level,("%s", buf));
445 static void debugadd_cb(const char *buf, void *private_data)
447 int *plevel = (int *)private_data;
448 DEBUGADD(*plevel, ("%s", buf));
451 void print_asc_cb(const uint8_t *buf, int len,
452 void (*cb)(const char *buf, void *private_data),
459 for (i=0; i<len; i++) {
460 s[0] = isprint(buf[i]) ? buf[i] : '.';
465 void print_asc(int level, const uint8_t *buf,int len)
467 print_asc_cb(buf, len, debugadd_cb, &level);
471 * Write dump of binary data to a callback
473 void dump_data_cb(const uint8_t *buf, int len,
474 bool omit_zero_bytes,
475 void (*cb)(const char *buf, void *private_data),
479 static const uint8_t empty[16] = { 0, };
480 bool skipped = false;
488 if ((omit_zero_bytes == true) &&
491 (memcmp(&buf[i], &empty, 16) == 0))
498 snprintf(tmp, sizeof(tmp), "[%04X] ", i);
499 cb(tmp, private_data);
503 snprintf(tmp, sizeof(tmp), "%02X ", (int)buf[i]);
504 cb(tmp, private_data);
507 cb(" ", private_data);
511 print_asc_cb(&buf[i-16], 8, cb, private_data);
512 cb(" ", private_data);
513 print_asc_cb(&buf[i-8], 8, cb, private_data);
514 cb("\n", private_data);
516 if ((omit_zero_bytes == true) &&
518 (memcmp(&buf[i], &empty, 16) == 0)) {
520 cb("skipping zero buffer bytes\n",
531 cb(" ", private_data);
533 cb(" ", private_data);
536 cb(" ", private_data);
539 print_asc_cb(&buf[i-(i%16)], n, cb, private_data);
540 cb(" ", private_data);
543 print_asc_cb(&buf[i-n], n, cb, private_data);
545 cb("\n", private_data);
551 * Write dump of binary data to the log file.
553 * The data is only written if the log level is at least level.
555 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
557 if (!DEBUGLVL(level)) {
560 dump_data_cb(buf, len, false, debugadd_cb, &level);
564 * Write dump of binary data to the log file.
566 * The data is only written if the log level is at least level for
567 * debug class dbgc_class.
569 _PUBLIC_ void dump_data_dbgc(int dbgc_class, int level, const uint8_t *buf, int len)
571 struct debug_channel_level dcl = { dbgc_class, level };
573 if (!DEBUGLVLC(dbgc_class, level)) {
576 dump_data_cb(buf, len, false, debugadd_channel_cb, &dcl);
580 * Write dump of binary data to the log file.
582 * The data is only written if the log level is at least level.
583 * 16 zero bytes in a row are omitted
585 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
587 if (!DEBUGLVL(level)) {
590 dump_data_cb(buf, len, true, debugadd_cb, &level);
593 static void fprintf_cb(const char *buf, void *private_data)
595 FILE *f = (FILE *)private_data;
596 fprintf(f, "%s", buf);
599 void dump_data_file(const uint8_t *buf, int len, bool omit_zero_bytes,
602 dump_data_cb(buf, len, omit_zero_bytes, fprintf_cb, f);
606 malloc that aborts with smb_panic on fail or zero size.
609 _PUBLIC_ void *smb_xmalloc(size_t size)
613 smb_panic("smb_xmalloc: called with zero size.\n");
614 if ((p = malloc(size)) == NULL)
615 smb_panic("smb_xmalloc: malloc fail.\n");
620 Memdup with smb_panic on fail.
623 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
626 p2 = smb_xmalloc(size);
632 strdup that aborts on malloc fail.
635 char *smb_xstrdup(const char *s)
637 #if defined(PARANOID_MALLOC_CHECKER)
644 #define strdup rep_strdup
647 char *s1 = strdup(s);
648 #if defined(PARANOID_MALLOC_CHECKER)
652 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
655 smb_panic("smb_xstrdup: malloc failed");
662 strndup that aborts on malloc fail.
665 char *smb_xstrndup(const char *s, size_t n)
667 #if defined(PARANOID_MALLOC_CHECKER)
673 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
675 #define strndup rep_strndup
678 char *s1 = strndup(s, n);
679 #if defined(PARANOID_MALLOC_CHECKER)
683 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
686 smb_panic("smb_xstrndup: malloc failed");
694 Like strdup but for memory.
697 _PUBLIC_ void *smb_memdup(const void *p, size_t size)
710 * Write a password to the log file.
712 * @note Only actually does something if DEBUG_PASSWORD was defined during
715 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
717 #ifdef DEBUG_PASSWORD
718 DEBUG(11, ("%s", msg));
719 if (data != NULL && len > 0)
721 dump_data(11, data, len);
728 * see if a range of memory is all zero. A NULL pointer is considered
731 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
734 if (!ptr) return true;
735 for (i=0;i<size;i++) {
736 if (ptr[i]) return false;
742 realloc an array, checking for integer overflow in the array size
744 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
746 #define MAX_MALLOC_SIZE 0x7fffffff
748 count >= MAX_MALLOC_SIZE/el_size) {
754 return malloc(el_size * count);
756 return realloc(ptr, el_size * count);
759 /****************************************************************************
761 ****************************************************************************/
763 void *malloc_array(size_t el_size, unsigned int count)
765 return realloc_array(NULL, el_size, count, false);
768 /****************************************************************************
770 ****************************************************************************/
772 void *memalign_array(size_t el_size, size_t align, unsigned int count)
774 if (count*el_size >= MAX_MALLOC_SIZE) {
778 return memalign(align, el_size*count);
781 /****************************************************************************
783 ****************************************************************************/
785 void *calloc_array(size_t size, size_t nmemb)
787 if (nmemb >= MAX_MALLOC_SIZE/size) {
790 if (size == 0 || nmemb == 0) {
793 return calloc(nmemb, size);
797 Trim the specified elements off the front and back of a string.
799 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
806 /* Ignore null or empty strings. */
807 if (!s || (s[0] == '\0'))
810 front_len = front? strlen(front) : 0;
811 back_len = back? strlen(back) : 0;
816 while (len && strncmp(s, front, front_len)==0) {
817 /* Must use memmove here as src & dest can
818 * easily overlap. Found by valgrind. JRA. */
819 memmove(s, s+front_len, (len-front_len)+1);
826 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
827 s[len-back_len]='\0';
836 Find the number of 'c' chars in a string
838 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
843 if (*s == c) count++;
851 * Routine to get hex characters and turn them into a byte array.
852 * the array can be variable length.
853 * - "0xnn" or "0Xnn" is specially catered for.
854 * - The first non-hex-digit character (apart from possibly leading "0x"
855 * finishes the conversion and skips the rest of the input.
856 * - A single hex-digit character at the end of the string is skipped.
858 * valid examples: "0A5D15"; "0x123456"
860 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
863 size_t num_chars = 0;
864 uint8_t lonybble, hinybble;
865 const char *hexchars = "0123456789ABCDEF";
866 char *p1 = NULL, *p2 = NULL;
868 /* skip leading 0x prefix */
869 if (strncasecmp(strhex, "0x", 2) == 0) {
870 i += 2; /* skip two chars */
873 for (; i+1 < strhex_len && strhex[i] != 0 && strhex[i+1] != 0; i++) {
874 p1 = strchr(hexchars, toupper((unsigned char)strhex[i]));
879 i++; /* next hex digit */
881 p2 = strchr(hexchars, toupper((unsigned char)strhex[i]));
886 /* get the two nybbles */
887 hinybble = PTR_DIFF(p1, hexchars);
888 lonybble = PTR_DIFF(p2, hexchars);
890 if (num_chars >= p_len) {
894 p[num_chars] = (hinybble << 4) | lonybble;
904 * Parse a hex string and return a data blob.
906 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
908 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
910 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
918 * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
920 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen)
923 for (i=0; i<srclen; i++) {
924 snprintf(dst + i*2, 3, "%02X", src[i]);
927 * Ensure 0-termination for 0-length buffers
929 dst[srclen*2] = '\0';
933 * Routine to print a buffer as HEX digits, into an allocated string.
935 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
939 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
940 hex_buffer = *out_hex_buffer;
941 hex_encode_buf(hex_buffer, buff_in, len);
945 * talloc version of hex_encode()
947 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
951 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
955 hex_encode_buf(hex_buffer, buff_in, len);
956 talloc_set_name_const(hex_buffer, hex_buffer);
961 varient of strcmp() that handles NULL ptrs
963 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
968 if (s1 == NULL || s2 == NULL) {
971 return strcmp(s1, s2);
976 return the number of bytes occupied by a buffer in ASCII format
977 the result includes the null termination
980 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
984 len = strnlen(src, n);
993 Set a boolean variable from the text value stored in the passed string.
994 Returns true in success, false if the passed string does not correctly
998 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
1000 if (strwicmp(boolean_string, "yes") == 0 ||
1001 strwicmp(boolean_string, "true") == 0 ||
1002 strwicmp(boolean_string, "on") == 0 ||
1003 strwicmp(boolean_string, "1") == 0) {
1006 } else if (strwicmp(boolean_string, "no") == 0 ||
1007 strwicmp(boolean_string, "false") == 0 ||
1008 strwicmp(boolean_string, "off") == 0 ||
1009 strwicmp(boolean_string, "0") == 0) {
1017 return the number of bytes occupied by a buffer in CH_UTF16 format
1018 the result includes the null termination
1020 _PUBLIC_ size_t utf16_len(const void *buf)
1024 for (len = 0; SVAL(buf,len); len += 2) ;
1030 return the number of bytes occupied by a buffer in CH_UTF16 format
1031 the result includes the null termination
1032 limited by 'n' bytes
1034 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
1038 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
1049 * @brief String utilities.
1052 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
1059 const char *saved_s;
1071 /* default to simple separators */
1076 /* find the first non sep char, if left-trimming is requested */
1078 while (*s && strchr_m(sep,*s)) {
1088 /* When restarting we need to go from here. */
1091 /* Work out the length needed. */
1092 for (quoted = false; *s &&
1093 (quoted || !strchr_m(sep,*s)); s++) {
1101 /* We started with len = 1 so we have space for the nul. */
1102 *pp_buff = talloc_array(ctx, char, len);
1107 /* copy over the token */
1110 for (quoted = false; *s &&
1111 (quoted || !strchr_m(sep,*s)); s++) {
1119 *ptr = (*s) ? s+1 : s;
1125 bool next_token_talloc(TALLOC_CTX *ctx,
1130 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
1134 * Get the next token from a string, return false if none found. Handles
1135 * double-quotes. This version does not trim leading separator characters
1136 * before looking for a token.
1139 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
1144 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
1148 * Get the next token from a string, return False if none found.
1149 * Handles double-quotes.
1151 * Based on a routine by GJC@VILLAGE.COM.
1152 * Extensively modified by Andrew.Tridgell@anu.edu.au
1154 _PUBLIC_ bool next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
1165 /* default to simple separators */
1169 /* find the first non sep char */
1170 while (*s && strchr_m(sep,*s))
1177 /* copy over the token */
1178 for (quoted = false; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
1187 *ptr = (*s) ? s+1 : s;
1193 struct anonymous_shared_header {
1200 /* Map a shared memory buffer of at least nelem counters. */
1201 void *anonymous_shared_allocate(size_t orig_bufsz)
1205 size_t pagesz = getpagesize();
1207 size_t bufsz = orig_bufsz;
1208 struct anonymous_shared_header *hdr;
1210 bufsz += sizeof(*hdr);
1212 /* round up to full pages */
1213 pagecnt = bufsz / pagesz;
1214 if (bufsz % pagesz) {
1217 bufsz = pagesz * pagecnt;
1219 if (orig_bufsz >= bufsz) {
1227 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
1228 -1 /* fd */, 0 /* offset */);
1234 fd = open("/dev/zero", O_RDWR);
1239 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
1240 fd, 0 /* offset */);
1241 saved_errno = errno;
1243 errno = saved_errno;
1247 if (buf == MAP_FAILED) {
1251 hdr = (struct anonymous_shared_header *)buf;
1252 hdr->u.length = bufsz;
1254 ptr = (void *)(&hdr[1]);
1259 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove)
1263 size_t pagesz = getpagesize();
1266 struct anonymous_shared_header *hdr;
1274 hdr = (struct anonymous_shared_header *)ptr;
1276 if (hdr->u.length > (new_size + sizeof(*hdr))) {
1281 bufsz = new_size + sizeof(*hdr);
1283 /* round up to full pages */
1284 pagecnt = bufsz / pagesz;
1285 if (bufsz % pagesz) {
1288 bufsz = pagesz * pagecnt;
1290 if (new_size >= bufsz) {
1296 if (bufsz <= hdr->u.length) {
1301 flags = MREMAP_MAYMOVE;
1304 buf = mremap(hdr, hdr->u.length, bufsz, flags);
1306 if (buf == MAP_FAILED) {
1311 hdr = (struct anonymous_shared_header *)buf;
1312 hdr->u.length = bufsz;
1314 ptr = (void *)(&hdr[1]);
1323 void anonymous_shared_free(void *ptr)
1325 struct anonymous_shared_header *hdr;
1331 hdr = (struct anonymous_shared_header *)ptr;
1335 munmap(hdr, hdr->u.length);
1339 /* used when you want a debugger started at a particular point in the
1340 code. Mostly useful in code that runs as a child process, where
1341 normal gdb attach is harder to organise.
1343 void samba_start_debugger(void)
1346 if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
1349 if (system(cmd) == -1) {