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 ret = lstat(dname, &st);
155 if (errno != ENOENT) {
156 DEBUG(0, ("lstat failed on directory %s: %s\n",
157 dname, strerror(errno)));
161 /* Create directory */
162 old_umask = umask(0);
163 ret = mkdir(dname, dir_perms);
164 if (ret == -1 && errno != EEXIST) {
165 DEBUG(0, ("mkdir failed on directory "
173 ret = lstat(dname, &st);
175 DEBUG(0, ("lstat failed on created directory %s: %s\n",
176 dname, strerror(errno)));
181 /* Check ownership and permission on existing directory */
182 if (!S_ISDIR(st.st_mode)) {
183 DEBUG(0, ("directory %s isn't a directory\n",
187 if (st.st_uid != uid && !uwrap_enabled()) {
188 DEBUG(0, ("invalid ownership on directory "
192 if ((st.st_mode & 0777) != dir_perms) {
193 DEBUG(0, ("invalid permissions on directory "
194 "'%s': has 0%o should be 0%o\n", dname,
195 (st.st_mode & 0777), dir_perms));
204 Sleep for a specified number of milliseconds.
207 _PUBLIC_ void smb_msleep(unsigned int t)
209 #if defined(HAVE_NANOSLEEP)
214 ts.tv_nsec = 1000000*(t%1000);
218 ret = nanosleep(&ts, &ts);
219 } while (ret < 0 && errno == EINTR && (ts.tv_sec > 0 || ts.tv_nsec > 0));
221 unsigned int tdiff=0;
222 struct timeval tval,t1,t2;
229 tval.tv_sec = (t-tdiff)/1000;
230 tval.tv_usec = 1000*((t-tdiff)%1000);
232 /* Never wait for more than 1 sec. */
233 if (tval.tv_sec > 1) {
240 select(0,&fds,NULL,NULL,&tval);
243 if (t2.tv_sec < t1.tv_sec) {
244 /* Someone adjusted time... */
248 tdiff = usec_time_diff(&t2,&t1)/1000;
254 Get my own name, return in talloc'ed storage.
257 _PUBLIC_ char *get_myname(TALLOC_CTX *ctx)
260 char hostname[HOST_NAME_MAX];
262 /* get my host name */
263 if (gethostname(hostname, sizeof(hostname)) == -1) {
264 DEBUG(0,("gethostname failed\n"));
268 /* Ensure null termination. */
269 hostname[sizeof(hostname)-1] = '\0';
271 /* split off any parts after an initial . */
272 p = strchr_m(hostname, '.');
277 return talloc_strdup(ctx, hostname);
281 Check if a process exists. Does this work on all unixes?
284 _PUBLIC_ bool process_exists_by_pid(pid_t pid)
286 /* Doing kill with a non-positive pid causes messages to be
287 * sent to places we don't want. */
289 return(kill(pid,0) == 0 || errno != ESRCH);
293 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
294 is dealt with in posix.c
297 _PUBLIC_ bool fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
302 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
305 lock.l_whence = SEEK_SET;
306 lock.l_start = offset;
310 ret = fcntl(fd,op,&lock);
312 if (ret == -1 && errno != 0)
313 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
318 (lock.l_type != F_UNLCK) &&
320 (lock.l_pid != getpid())) {
321 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
325 /* it must be not locked or locked by me */
329 /* a lock set or unset */
331 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
332 (double)offset,(double)count,op,type,strerror(errno)));
336 /* everything went OK */
337 DEBUG(8,("fcntl_lock: Lock call successful\n"));
342 static void debugadd_cb(const char *buf, void *private_data)
344 int *plevel = (int *)private_data;
345 DEBUGADD(*plevel, ("%s", buf));
348 void print_asc_cb(const uint8_t *buf, int len,
349 void (*cb)(const char *buf, void *private_data),
356 for (i=0; i<len; i++) {
357 s[0] = isprint(buf[i]) ? buf[i] : '.';
362 void print_asc(int level, const uint8_t *buf,int len)
364 print_asc_cb(buf, len, debugadd_cb, &level);
368 * Write dump of binary data to a callback
370 void dump_data_cb(const uint8_t *buf, int len,
371 bool omit_zero_bytes,
372 void (*cb)(const char *buf, void *private_data),
376 static const uint8_t empty[16] = { 0, };
377 bool skipped = false;
385 if ((omit_zero_bytes == true) &&
388 (memcmp(&buf[i], &empty, 16) == 0))
395 snprintf(tmp, sizeof(tmp), "[%04X] ", i);
396 cb(tmp, private_data);
400 snprintf(tmp, sizeof(tmp), "%02X ", (int)buf[i]);
401 cb(tmp, private_data);
404 cb(" ", private_data);
408 print_asc_cb(&buf[i-16], 8, cb, private_data);
409 cb(" ", private_data);
410 print_asc_cb(&buf[i-8], 8, cb, private_data);
411 cb("\n", private_data);
413 if ((omit_zero_bytes == true) &&
415 (memcmp(&buf[i], &empty, 16) == 0)) {
417 cb("skipping zero buffer bytes\n",
428 cb(" ", private_data);
430 cb(" ", private_data);
433 cb(" ", private_data);
436 print_asc_cb(&buf[i-(i%16)], n, cb, private_data);
437 cb(" ", private_data);
440 print_asc_cb(&buf[i-n], n, cb, private_data);
442 cb("\n", private_data);
448 * Write dump of binary data to the log file.
450 * The data is only written if the log level is at least level.
452 _PUBLIC_ void dump_data(int level, const uint8_t *buf, int len)
454 if (!DEBUGLVL(level)) {
457 dump_data_cb(buf, len, false, debugadd_cb, &level);
461 * Write dump of binary data to the log file.
463 * The data is only written if the log level is at least level.
464 * 16 zero bytes in a row are omitted
466 _PUBLIC_ void dump_data_skip_zeros(int level, const uint8_t *buf, int len)
468 if (!DEBUGLVL(level)) {
471 dump_data_cb(buf, len, true, debugadd_cb, &level);
474 static void fprintf_cb(const char *buf, void *private_data)
476 FILE *f = (FILE *)private_data;
477 fprintf(f, "%s", buf);
480 void dump_data_file(const uint8_t *buf, int len, bool omit_zero_bytes,
483 dump_data_cb(buf, len, omit_zero_bytes, fprintf_cb, f);
487 malloc that aborts with smb_panic on fail or zero size.
490 _PUBLIC_ void *smb_xmalloc(size_t size)
494 smb_panic("smb_xmalloc: called with zero size.\n");
495 if ((p = malloc(size)) == NULL)
496 smb_panic("smb_xmalloc: malloc fail.\n");
501 Memdup with smb_panic on fail.
504 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
507 p2 = smb_xmalloc(size);
513 strdup that aborts on malloc fail.
516 char *smb_xstrdup(const char *s)
518 #if defined(PARANOID_MALLOC_CHECKER)
525 #define strdup rep_strdup
528 char *s1 = strdup(s);
529 #if defined(PARANOID_MALLOC_CHECKER)
533 #define strdup(s) __ERROR_DONT_USE_STRDUP_DIRECTLY
536 smb_panic("smb_xstrdup: malloc failed");
543 strndup that aborts on malloc fail.
546 char *smb_xstrndup(const char *s, size_t n)
548 #if defined(PARANOID_MALLOC_CHECKER)
554 #if (defined(BROKEN_STRNDUP) || !defined(HAVE_STRNDUP))
556 #define strndup rep_strndup
559 char *s1 = strndup(s, n);
560 #if defined(PARANOID_MALLOC_CHECKER)
564 #define strndup(s,n) __ERROR_DONT_USE_STRNDUP_DIRECTLY
567 smb_panic("smb_xstrndup: malloc failed");
575 Like strdup but for memory.
578 _PUBLIC_ void *memdup(const void *p, size_t size)
591 * Write a password to the log file.
593 * @note Only actually does something if DEBUG_PASSWORD was defined during
596 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
598 #ifdef DEBUG_PASSWORD
599 DEBUG(11, ("%s", msg));
600 if (data != NULL && len > 0)
602 dump_data(11, data, len);
609 * see if a range of memory is all zero. A NULL pointer is considered
612 _PUBLIC_ bool all_zero(const uint8_t *ptr, size_t size)
615 if (!ptr) return true;
616 for (i=0;i<size;i++) {
617 if (ptr[i]) return false;
623 realloc an array, checking for integer overflow in the array size
625 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count, bool free_on_fail)
627 #define MAX_MALLOC_SIZE 0x7fffffff
629 count >= MAX_MALLOC_SIZE/el_size) {
635 return malloc(el_size * count);
637 return realloc(ptr, el_size * count);
640 /****************************************************************************
642 ****************************************************************************/
644 void *malloc_array(size_t el_size, unsigned int count)
646 return realloc_array(NULL, el_size, count, false);
650 Trim the specified elements off the front and back of a string.
652 _PUBLIC_ bool trim_string(char *s, const char *front, const char *back)
659 /* Ignore null or empty strings. */
660 if (!s || (s[0] == '\0'))
663 front_len = front? strlen(front) : 0;
664 back_len = back? strlen(back) : 0;
669 while (len && strncmp(s, front, front_len)==0) {
670 /* Must use memmove here as src & dest can
671 * easily overlap. Found by valgrind. JRA. */
672 memmove(s, s+front_len, (len-front_len)+1);
679 while ((len >= back_len) && strncmp(s+len-back_len,back,back_len)==0) {
680 s[len-back_len]='\0';
689 Find the number of 'c' chars in a string
691 _PUBLIC_ _PURE_ size_t count_chars(const char *s, char c)
696 if (*s == c) count++;
704 * Routine to get hex characters and turn them into a byte array.
705 * the array can be variable length.
706 * - "0xnn" or "0Xnn" is specially catered for.
707 * - The first non-hex-digit character (apart from possibly leading "0x"
708 * finishes the conversion and skips the rest of the input.
709 * - A single hex-digit character at the end of the string is skipped.
711 * valid examples: "0A5D15"; "0x123456"
713 _PUBLIC_ size_t strhex_to_str(char *p, size_t p_len, const char *strhex, size_t strhex_len)
716 size_t num_chars = 0;
717 uint8_t lonybble, hinybble;
718 const char *hexchars = "0123456789ABCDEF";
719 char *p1 = NULL, *p2 = NULL;
721 /* skip leading 0x prefix */
722 if (strncasecmp(strhex, "0x", 2) == 0) {
723 i += 2; /* skip two chars */
726 for (; i+1 < strhex_len && strhex[i] != 0 && strhex[i+1] != 0; i++) {
727 p1 = strchr(hexchars, toupper((unsigned char)strhex[i]));
732 i++; /* next hex digit */
734 p2 = strchr(hexchars, toupper((unsigned char)strhex[i]));
739 /* get the two nybbles */
740 hinybble = PTR_DIFF(p1, hexchars);
741 lonybble = PTR_DIFF(p2, hexchars);
743 if (num_chars >= p_len) {
747 p[num_chars] = (hinybble << 4) | lonybble;
757 * Parse a hex string and return a data blob.
759 _PUBLIC_ _PURE_ DATA_BLOB strhex_to_data_blob(TALLOC_CTX *mem_ctx, const char *strhex)
761 DATA_BLOB ret_blob = data_blob_talloc(mem_ctx, NULL, strlen(strhex)/2+1);
763 ret_blob.length = strhex_to_str((char *)ret_blob.data, ret_blob.length,
771 * Print a buf in hex. Assumes dst is at least (srclen*2)+1 large.
773 _PUBLIC_ void hex_encode_buf(char *dst, const uint8_t *src, size_t srclen)
776 for (i=0; i<srclen; i++) {
777 snprintf(dst + i*2, 3, "%02X", src[i]);
780 * Ensure 0-termination for 0-length buffers
782 dst[srclen*2] = '\0';
786 * Routine to print a buffer as HEX digits, into an allocated string.
788 _PUBLIC_ void hex_encode(const unsigned char *buff_in, size_t len, char **out_hex_buffer)
792 *out_hex_buffer = malloc_array_p(char, (len*2)+1);
793 hex_buffer = *out_hex_buffer;
794 hex_encode_buf(hex_buffer, buff_in, len);
798 * talloc version of hex_encode()
800 _PUBLIC_ char *hex_encode_talloc(TALLOC_CTX *mem_ctx, const unsigned char *buff_in, size_t len)
804 hex_buffer = talloc_array(mem_ctx, char, (len*2)+1);
808 hex_encode_buf(hex_buffer, buff_in, len);
809 talloc_set_name_const(hex_buffer, hex_buffer);
814 varient of strcmp() that handles NULL ptrs
816 _PUBLIC_ int strcmp_safe(const char *s1, const char *s2)
821 if (s1 == NULL || s2 == NULL) {
824 return strcmp(s1, s2);
829 return the number of bytes occupied by a buffer in ASCII format
830 the result includes the null termination
833 _PUBLIC_ size_t ascii_len_n(const char *src, size_t n)
837 len = strnlen(src, n);
846 Set a boolean variable from the text value stored in the passed string.
847 Returns true in success, false if the passed string does not correctly
851 _PUBLIC_ bool set_boolean(const char *boolean_string, bool *boolean)
853 if (strwicmp(boolean_string, "yes") == 0 ||
854 strwicmp(boolean_string, "true") == 0 ||
855 strwicmp(boolean_string, "on") == 0 ||
856 strwicmp(boolean_string, "1") == 0) {
859 } else if (strwicmp(boolean_string, "no") == 0 ||
860 strwicmp(boolean_string, "false") == 0 ||
861 strwicmp(boolean_string, "off") == 0 ||
862 strwicmp(boolean_string, "0") == 0) {
870 return the number of bytes occupied by a buffer in CH_UTF16 format
871 the result includes the null termination
873 _PUBLIC_ size_t utf16_len(const void *buf)
877 for (len = 0; SVAL(buf,len); len += 2) ;
883 return the number of bytes occupied by a buffer in CH_UTF16 format
884 the result includes the null termination
887 _PUBLIC_ size_t utf16_len_n(const void *src, size_t n)
891 for (len = 0; (len+2 < n) && SVAL(src, len); len += 2) ;
902 * @brief String utilities.
905 static bool next_token_internal_talloc(TALLOC_CTX *ctx,
924 /* default to simple separators */
929 /* find the first non sep char, if left-trimming is requested */
931 while (*s && strchr_m(sep,*s)) {
941 /* When restarting we need to go from here. */
944 /* Work out the length needed. */
945 for (quoted = false; *s &&
946 (quoted || !strchr_m(sep,*s)); s++) {
954 /* We started with len = 1 so we have space for the nul. */
955 *pp_buff = talloc_array(ctx, char, len);
960 /* copy over the token */
963 for (quoted = false; *s &&
964 (quoted || !strchr_m(sep,*s)); s++) {
972 *ptr = (*s) ? s+1 : s;
978 bool next_token_talloc(TALLOC_CTX *ctx,
983 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, true);
987 * Get the next token from a string, return false if none found. Handles
988 * double-quotes. This version does not trim leading separator characters
989 * before looking for a token.
992 bool next_token_no_ltrim_talloc(TALLOC_CTX *ctx,
997 return next_token_internal_talloc(ctx, ptr, pp_buff, sep, false);
1001 * Get the next token from a string, return False if none found.
1002 * Handles double-quotes.
1004 * Based on a routine by GJC@VILLAGE.COM.
1005 * Extensively modified by Andrew.Tridgell@anu.edu.au
1007 _PUBLIC_ bool next_token(const char **ptr,char *buff, const char *sep, size_t bufsize)
1018 /* default to simple separators */
1022 /* find the first non sep char */
1023 while (*s && strchr_m(sep,*s))
1030 /* copy over the token */
1031 for (quoted = false; len < bufsize && *s && (quoted || !strchr_m(sep,*s)); s++) {
1040 *ptr = (*s) ? s+1 : s;
1046 struct anonymous_shared_header {
1053 /* Map a shared memory buffer of at least nelem counters. */
1054 void *anonymous_shared_allocate(size_t orig_bufsz)
1058 size_t pagesz = getpagesize();
1060 size_t bufsz = orig_bufsz;
1061 struct anonymous_shared_header *hdr;
1063 bufsz += sizeof(*hdr);
1065 /* round up to full pages */
1066 pagecnt = bufsz / pagesz;
1067 if (bufsz % pagesz) {
1070 bufsz = pagesz * pagecnt;
1072 if (orig_bufsz >= bufsz) {
1080 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_ANON|MAP_SHARED,
1081 -1 /* fd */, 0 /* offset */);
1083 buf = mmap(NULL, bufsz, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
1084 open("/dev/zero", O_RDWR), 0 /* offset */);
1087 if (buf == MAP_FAILED) {
1091 hdr = (struct anonymous_shared_header *)buf;
1092 hdr->u.length = bufsz;
1094 ptr = (void *)(&hdr[1]);
1099 void *anonymous_shared_resize(void *ptr, size_t new_size, bool maymove)
1103 size_t pagesz = getpagesize();
1106 struct anonymous_shared_header *hdr;
1114 hdr = (struct anonymous_shared_header *)ptr;
1116 if (hdr->u.length > (new_size + sizeof(*hdr))) {
1121 bufsz = new_size + sizeof(*hdr);
1123 /* round up to full pages */
1124 pagecnt = bufsz / pagesz;
1125 if (bufsz % pagesz) {
1128 bufsz = pagesz * pagecnt;
1130 if (new_size >= bufsz) {
1136 if (bufsz <= hdr->u.length) {
1141 flags = MREMAP_MAYMOVE;
1144 buf = mremap(hdr, hdr->u.length, bufsz, flags);
1146 if (buf == MAP_FAILED) {
1151 hdr = (struct anonymous_shared_header *)buf;
1152 hdr->u.length = bufsz;
1154 ptr = (void *)(&hdr[1]);
1163 void anonymous_shared_free(void *ptr)
1165 struct anonymous_shared_header *hdr;
1171 hdr = (struct anonymous_shared_header *)ptr;
1175 munmap(hdr, hdr->u.length);
1179 /* used when you want a debugger started at a particular point in the
1180 code. Mostly useful in code that runs as a child process, where
1181 normal gdb attach is harder to organise.
1183 void samba_start_debugger(void)
1186 if (asprintf(&cmd, "xterm -e \"gdb --pid %u\"&", getpid()) == -1) {
1189 if (system(cmd) == -1) {