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 2 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, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "dynconfig.h"
27 #include "system/network.h"
28 #include "system/iconv.h"
29 #include "system/filesys.h"
33 * @brief Misc utility functions
37 Find a suitable temporary directory. The result should be copied immediately
38 as it may be overwritten by a subsequent call.
40 _PUBLIC_ const char *tmpdir(void)
43 if ((p = getenv("TMPDIR")))
50 Check if a file exists - call vfs_file_exist for samba files.
52 _PUBLIC_ BOOL file_exist(const char *fname)
56 if (stat(fname, &st) != 0) {
60 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
64 Check a files mod time.
67 _PUBLIC_ time_t file_modtime(const char *fname)
71 if (stat(fname,&st) != 0)
78 Check if a directory exists.
81 _PUBLIC_ BOOL directory_exist(const char *dname)
86 if (stat(dname,&st) != 0) {
90 ret = S_ISDIR(st.st_mode);
97 * Try to create the specified directory if it didn't exist.
99 * @retval True if the directory already existed and has the right permissions
100 * or was successfully created.
102 _PUBLIC_ BOOL directory_create_or_exist(const char *dname, uid_t uid,
108 old_umask = umask(0);
109 if (lstat(dname, &st) == -1) {
110 if (errno == ENOENT) {
111 /* Create directory */
112 if (mkdir(dname, dir_perms) == -1) {
113 DEBUG(0, ("error creating directory "
120 DEBUG(0, ("lstat failed on directory %s: %s\n",
121 dname, strerror(errno)));
126 /* Check ownership and permission on existing directory */
127 if (!S_ISDIR(st.st_mode)) {
128 DEBUG(0, ("directory %s isn't a directory\n",
133 if ((st.st_uid != uid) ||
134 ((st.st_mode & 0777) != dir_perms)) {
135 DEBUG(0, ("invalid permissions on directory "
145 /*******************************************************************
146 Close the low 3 fd's and open dev/null in their place.
147 ********************************************************************/
148 static void close_low_fds(BOOL stderr_too)
160 /* try and use up these file descriptors, so silly
161 library routines writing to stdout etc won't cause havoc */
163 if (i == 2 && !stderr_too)
166 fd = open("/dev/null",O_RDWR,0);
168 fd = open("/dev/null",O_WRONLY,0);
170 DEBUG(0,("Can't open /dev/null\n"));
174 DEBUG(0,("Didn't get file descriptor %d\n",i));
182 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
188 _PUBLIC_ int set_blocking(int fd, BOOL set)
192 #define FLAG_TO_SET O_NONBLOCK
195 #define FLAG_TO_SET O_NDELAY
197 #define FLAG_TO_SET FNDELAY
201 if((val = fcntl(fd, F_GETFL, 0)) == -1)
203 if(set) /* Turn blocking on - ie. clear nonblock flag */
207 return fcntl( fd, F_SETFL, val);
213 Sleep for a specified number of milliseconds.
216 _PUBLIC_ void msleep(uint_t t)
220 tval.tv_sec = t/1000;
221 tval.tv_usec = 1000*(t%1000);
222 /* this should be the real select - do NOT replace
224 select(0,NULL,NULL,NULL,&tval);
228 Become a daemon, discarding the controlling terminal.
231 _PUBLIC_ void become_daemon(BOOL Fork)
239 /* detach from the terminal */
242 #elif defined(TIOCNOTTY)
244 int i = open("/dev/tty", O_RDWR, 0);
246 ioctl(i, (int) TIOCNOTTY, (char *)0);
250 #endif /* HAVE_SETSID */
252 /* Close fd's 0,1,2. Needed if started by rsh */
253 close_low_fds(False); /* Don't close stderr, let the debug system
254 attach it to the logfile */
259 Free memory, checks for NULL.
260 Use directly SAFE_FREE()
261 Exists only because we need to pass a function pointer somewhere --SSS
264 _PUBLIC_ void safe_free(void *p)
271 see if a string matches either our primary or one of our secondary
272 netbios aliases. do a case insensitive match
274 _PUBLIC_ BOOL is_myname(const char *name)
276 const char **aliases;
279 if (strcasecmp(name, lp_netbios_name()) == 0) {
283 aliases = lp_netbios_aliases();
284 for (i=0; aliases && aliases[i]; i++) {
285 if (strcasecmp(name, aliases[i]) == 0) {
295 Get my own name, return in malloc'ed storage.
298 _PUBLIC_ char* get_myname(void)
301 const int host_name_max = 255;
304 hostname = malloc(host_name_max+1);
307 /* get my host name */
308 if (gethostname(hostname, host_name_max+1) == -1) {
309 DEBUG(0,("gethostname failed\n"));
313 /* Ensure null termination. */
314 hostname[host_name_max] = '\0';
316 /* split off any parts after an initial . */
317 p = strchr_m(hostname,'.');
326 Return true if a string could be a pure IP address.
329 _PUBLIC_ BOOL is_ipaddress(const char *str)
331 BOOL pure_address = True;
334 for (i=0; pure_address && str[i]; i++)
335 if (!(isdigit((int)str[i]) || str[i] == '.'))
336 pure_address = False;
338 /* Check that a pure number is not misinterpreted as an IP */
339 pure_address = pure_address && (strchr_m(str, '.') != NULL);
345 Interpret an internet address or name into an IP address in 4 byte form.
347 _PUBLIC_ uint32_t interpret_addr(const char *str)
352 if (str == NULL || *str == 0 ||
353 strcmp(str,"0.0.0.0") == 0) {
356 if (strcmp(str,"255.255.255.255") == 0) {
359 /* recognise 'localhost' as a special name. This fixes problems with
360 some hosts that don't have localhost in /etc/hosts */
361 if (strcasecmp(str,"localhost") == 0) {
365 /* if it's in the form of an IP address then get the lib to interpret it */
366 if (is_ipaddress(str)) {
367 res = inet_addr(str);
369 /* otherwise assume it's a network name of some sort and use
371 if ((hp = sys_gethostbyname(str)) == 0) {
372 DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
376 if(hp->h_addr == NULL) {
377 DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
380 memcpy((char *)&res,(char *)hp->h_addr, 4);
383 if (res == (uint32_t)-1)
390 A convenient addition to interpret_addr().
392 _PUBLIC_ struct ipv4_addr interpret_addr2(const char *str)
394 struct ipv4_addr ret;
395 uint32_t a = interpret_addr(str);
401 Check if an IP is the 0.0.0.0.
404 _PUBLIC_ BOOL is_zero_ip(struct ipv4_addr ip)
410 Are two IPs on the same subnet?
413 _PUBLIC_ BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask)
415 uint32_t net1,net2,nmask;
417 nmask = ntohl(mask.addr);
418 net1 = ntohl(ip1.addr);
419 net2 = ntohl(ip2.addr);
421 return((net1 & nmask) == (net2 & nmask));
426 Check if a process exists. Does this work on all unixes?
429 _PUBLIC_ BOOL process_exists(pid_t pid)
431 /* Doing kill with a non-positive pid causes messages to be
432 * sent to places we don't want. */
434 return(kill(pid,0) == 0 || errno != ESRCH);
438 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
439 is dealt with in posix.c
442 _PUBLIC_ BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
447 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
450 lock.l_whence = SEEK_SET;
451 lock.l_start = offset;
455 ret = fcntl(fd,op,&lock);
457 if (ret == -1 && errno != 0)
458 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
463 (lock.l_type != F_UNLCK) &&
465 (lock.l_pid != getpid())) {
466 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
470 /* it must be not locked or locked by me */
474 /* a lock set or unset */
476 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
477 (double)offset,(double)count,op,type,strerror(errno)));
481 /* everything went OK */
482 DEBUG(8,("fcntl_lock: Lock call successful\n"));
488 static void print_asc(int level, const uint8_t *buf,int len)
492 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
496 * Write dump of binary data to the log file.
498 * The data is only written if the log level is at least level.
500 _PUBLIC_ void dump_data(int level, const uint8_t *buf,int len)
505 if (!DEBUGLVL(level)) return;
507 DEBUGADD(level,("[%03X] ",i));
509 DEBUGADD(level,("%02X ",(int)buf[i]));
511 if (i%8 == 0) DEBUGADD(level,(" "));
513 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
514 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
515 if (i<len) DEBUGADD(level,("[%03X] ",i));
521 DEBUGADD(level,(" "));
522 if (n>8) DEBUGADD(level,(" "));
523 while (n--) DEBUGADD(level,(" "));
525 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
527 if (n>0) print_asc(level,&buf[i-n],n);
528 DEBUGADD(level,("\n"));
533 malloc that aborts with smb_panic on fail or zero size.
536 _PUBLIC_ void *smb_xmalloc(size_t size)
540 smb_panic("smb_xmalloc: called with zero size.\n");
541 if ((p = malloc(size)) == NULL)
542 smb_panic("smb_xmalloc: malloc fail.\n");
547 Memdup with smb_panic on fail.
550 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
553 p2 = smb_xmalloc(size);
559 strdup that aborts on malloc fail.
562 _PUBLIC_ char *smb_xstrdup(const char *s)
564 char *s1 = strdup(s);
566 smb_panic("smb_xstrdup: malloc fail\n");
572 Like strdup but for memory.
575 _PUBLIC_ void *memdup(const void *p, size_t size)
588 A useful function for returning a path in the Samba lock directory.
590 _PUBLIC_ char *lock_path(TALLOC_CTX* mem_ctx, const char *name)
596 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
597 return talloc_strdup(mem_ctx, name);
600 dname = talloc_strdup(mem_ctx, lp_lockdir());
601 trim_string(dname,"","/");
603 if (!directory_exist(dname)) {
607 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
616 A useful function for returning a path in the Samba piddir directory.
618 static char *pid_path(TALLOC_CTX* mem_ctx, const char *name)
622 dname = talloc_strdup(mem_ctx, lp_piddir());
623 trim_string(dname,"","/");
625 if (!directory_exist(dname)) {
629 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
638 * @brief Returns an absolute path to a file in the Samba lib directory.
640 * @param name File to find, relative to DATADIR.
642 * @retval Pointer to a talloc'ed string containing the full path.
645 _PUBLIC_ char *data_path(TALLOC_CTX* mem_ctx, const char *name)
648 fname = talloc_asprintf(mem_ctx, "%s/%s", dyn_DATADIR, name);
653 * @brief Returns an absolute path to a file in the Samba private directory.
655 * @param name File to find, relative to PRIVATEDIR.
656 * if name is not relative, then use it as-is
658 * @retval Pointer to a talloc'ed string containing the full path.
660 _PUBLIC_ char *private_path(TALLOC_CTX* mem_ctx, const char *name)
666 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
667 return talloc_strdup(mem_ctx, name);
669 fname = talloc_asprintf(mem_ctx, "%s/%s", lp_private_dir(), name);
674 return a path in the smbd.tmp directory, where all temporary file
675 for smbd go. If NULL is passed for name then return the directory
678 _PUBLIC_ char *smbd_tmp_path(TALLOC_CTX *mem_ctx, const char *name)
682 dname = pid_path(mem_ctx, "smbd.tmp");
683 if (!directory_exist(dname)) {
691 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
697 static char *modules_path(TALLOC_CTX* mem_ctx, const char *name)
699 return talloc_asprintf(mem_ctx, "%s/%s", dyn_MODULESDIR, name);
703 * Load the initialization functions from DSO files for a specific subsystem.
705 * Will return an array of function pointers to initialization functions
708 _PUBLIC_ init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
710 char *path = modules_path(mem_ctx, subsystem);
713 ret = load_modules(mem_ctx, path);
721 * Write a password to the log file.
723 * @note Only actually does something if DEBUG_PASSWORD was defined during
726 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
728 #ifdef DEBUG_PASSWORD
729 DEBUG(11, ("%s", msg));
730 if (data != NULL && len > 0)
732 dump_data(11, data, len);
739 * see if a range of memory is all zero. A NULL pointer is considered
742 _PUBLIC_ BOOL all_zero(const uint8_t *ptr, uint_t size)
745 if (!ptr) return True;
746 for (i=0;i<size;i++) {
747 if (ptr[i]) return False;
753 realloc an array, checking for integer overflow in the array size
755 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count)
757 #define MAX_MALLOC_SIZE 0x7fffffff
759 count >= MAX_MALLOC_SIZE/el_size) {
763 return malloc(el_size * count);
765 return realloc(ptr, el_size * count);