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"
31 /***************************************************************************
32 Find a suitable temporary directory. The result should be copied immediately
33 as it may be overwritten by a subsequent call.
34 ****************************************************************************/
35 const char *tmpdir(void)
38 if ((p = getenv("TMPDIR")))
44 /*******************************************************************
45 Check if a file exists - call vfs_file_exist for samba files.
46 ********************************************************************/
47 BOOL file_exist(const char *fname)
51 if (stat(fname, &st) != 0) {
55 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
58 /*******************************************************************
59 Check a files mod time.
60 ********************************************************************/
62 time_t file_modtime(const char *fname)
66 if (stat(fname,&st) != 0)
72 /*******************************************************************
73 Check if a directory exists.
74 ********************************************************************/
76 BOOL directory_exist(const char *dname)
81 if (stat(dname,&st) != 0) {
85 ret = S_ISDIR(st.st_mode);
91 /*******************************************************************
92 Returns the size in bytes of the named file.
93 ********************************************************************/
94 off_t get_file_size(char *file_name)
98 if(stat(file_name,&buf) != 0)
103 /*******************************************************************
104 Close the low 3 fd's and open dev/null in their place.
105 ********************************************************************/
106 void close_low_fds(BOOL stderr_too)
118 /* try and use up these file descriptors, so silly
119 library routines writing to stdout etc won't cause havoc */
121 if (i == 2 && !stderr_too)
124 fd = open("/dev/null",O_RDWR,0);
126 fd = open("/dev/null",O_WRONLY,0);
128 DEBUG(0,("Can't open /dev/null\n"));
132 DEBUG(0,("Didn't get file descriptor %d\n",i));
139 /****************************************************************************
140 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
144 ****************************************************************************/
146 int set_blocking(int fd, BOOL set)
150 #define FLAG_TO_SET O_NONBLOCK
153 #define FLAG_TO_SET O_NDELAY
155 #define FLAG_TO_SET FNDELAY
159 if((val = fcntl(fd, F_GETFL, 0)) == -1)
161 if(set) /* Turn blocking on - ie. clear nonblock flag */
165 return fcntl( fd, F_SETFL, val);
170 /*******************************************************************
171 Sleep for a specified number of milliseconds.
172 ********************************************************************/
174 void msleep(uint_t t)
178 tval.tv_sec = t/1000;
179 tval.tv_usec = 1000*(t%1000);
180 /* this should be the real select - do NOT replace
182 select(0,NULL,NULL,NULL,&tval);
185 /****************************************************************************
186 Become a daemon, discarding the controlling terminal.
187 ****************************************************************************/
189 void become_daemon(BOOL Fork)
197 /* detach from the terminal */
200 #elif defined(TIOCNOTTY)
202 int i = open("/dev/tty", O_RDWR, 0);
204 ioctl(i, (int) TIOCNOTTY, (char *)0);
208 #endif /* HAVE_SETSID */
210 /* Close fd's 0,1,2. Needed if started by rsh */
211 close_low_fds(False); /* Don't close stderr, let the debug system
212 attach it to the logfile */
216 /****************************************************************************
217 Free memory, checks for NULL.
218 Use directly SAFE_FREE()
219 Exists only because we need to pass a function pointer somewhere --SSS
220 ****************************************************************************/
222 void safe_free(void *p)
229 see if a string matches either our primary or one of our secondary
230 netbios aliases. do a case insensitive match
232 BOOL is_myname(const char *name)
234 const char **aliases;
237 if (strcasecmp(name, lp_netbios_name()) == 0) {
241 aliases = lp_netbios_aliases();
242 for (i=0; aliases && aliases[i]; i++) {
243 if (strcasecmp(name, aliases[i]) == 0) {
252 /****************************************************************************
253 Get my own name, return in malloc'ed storage.
254 ****************************************************************************/
256 char* get_myname(void)
259 const int host_name_max = 255;
262 hostname = malloc(host_name_max+1);
265 /* get my host name */
266 if (gethostname(hostname, host_name_max+1) == -1) {
267 DEBUG(0,("gethostname failed\n"));
271 /* Ensure null termination. */
272 hostname[host_name_max] = '\0';
274 /* split off any parts after an initial . */
275 p = strchr_m(hostname,'.');
283 /****************************************************************************
284 Return true if a string could be a pure IP address.
285 ****************************************************************************/
287 BOOL is_ipaddress(const char *str)
289 BOOL pure_address = True;
292 for (i=0; pure_address && str[i]; i++)
293 if (!(isdigit((int)str[i]) || str[i] == '.'))
294 pure_address = False;
296 /* Check that a pure number is not misinterpreted as an IP */
297 pure_address = pure_address && (strchr_m(str, '.') != NULL);
302 /****************************************************************************
303 Interpret an internet address or name into an IP address in 4 byte form.
304 ****************************************************************************/
305 uint32_t interpret_addr(const char *str)
310 if (str == NULL || *str == 0 ||
311 strcmp(str,"0.0.0.0") == 0) {
314 if (strcmp(str,"255.255.255.255") == 0) {
317 /* recognise 'localhost' as a special name. This fixes problems with
318 some hosts that don't have localhost in /etc/hosts */
319 if (strcasecmp(str,"localhost") == 0) {
323 /* if it's in the form of an IP address then get the lib to interpret it */
324 if (is_ipaddress(str)) {
325 res = inet_addr(str);
327 /* otherwise assume it's a network name of some sort and use
329 if ((hp = sys_gethostbyname(str)) == 0) {
330 DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
334 if(hp->h_addr == NULL) {
335 DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
338 memcpy((char *)&res,(char *)hp->h_addr, 4);
341 if (res == (uint32_t)-1)
347 /*******************************************************************
348 A convenient addition to interpret_addr().
349 ******************************************************************/
350 struct ipv4_addr interpret_addr2(const char *str)
352 struct ipv4_addr ret;
353 uint32_t a = interpret_addr(str);
358 /*******************************************************************
359 Check if an IP is the 0.0.0.0.
360 ******************************************************************/
362 BOOL is_zero_ip(struct ipv4_addr ip)
367 /*******************************************************************
368 Set an IP to 0.0.0.0.
369 ******************************************************************/
371 void zero_ip(struct ipv4_addr *ip)
373 *ip = sys_inet_makeaddr(0,0);
378 /*******************************************************************
379 Are two IPs on the same subnet?
380 ********************************************************************/
382 BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask)
384 uint32_t net1,net2,nmask;
386 nmask = ntohl(mask.addr);
387 net1 = ntohl(ip1.addr);
388 net2 = ntohl(ip2.addr);
390 return((net1 & nmask) == (net2 & nmask));
394 /****************************************************************************
395 Check if a process exists. Does this work on all unixes?
396 ****************************************************************************/
398 BOOL process_exists(pid_t pid)
400 /* Doing kill with a non-positive pid causes messages to be
401 * sent to places we don't want. */
403 return(kill(pid,0) == 0 || errno != ESRCH);
406 /****************************************************************************
407 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
408 is dealt with in posix.c
409 ****************************************************************************/
411 BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
416 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
419 lock.l_whence = SEEK_SET;
420 lock.l_start = offset;
424 ret = fcntl(fd,op,&lock);
426 if (ret == -1 && errno != 0)
427 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
432 (lock.l_type != F_UNLCK) &&
434 (lock.l_pid != getpid())) {
435 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
439 /* it must be not locked or locked by me */
443 /* a lock set or unset */
445 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
446 (double)offset,(double)count,op,type,strerror(errno)));
450 /* everything went OK */
451 DEBUG(8,("fcntl_lock: Lock call successful\n"));
457 static void print_asc(int level, const uint8_t *buf,int len)
461 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
464 void dump_data(int level, const uint8_t *buf,int len)
469 if (!DEBUGLVL(level)) return;
471 DEBUGADD(level,("[%03X] ",i));
473 DEBUGADD(level,("%02X ",(int)buf[i]));
475 if (i%8 == 0) DEBUGADD(level,(" "));
477 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
478 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
479 if (i<len) DEBUGADD(level,("[%03X] ",i));
485 DEBUGADD(level,(" "));
486 if (n>8) DEBUGADD(level,(" "));
487 while (n--) DEBUGADD(level,(" "));
489 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
491 if (n>0) print_asc(level,&buf[i-n],n);
492 DEBUGADD(level,("\n"));
496 /*****************************************************************
497 malloc that aborts with smb_panic on fail or zero size.
498 *****************************************************************/
500 void *smb_xmalloc(size_t size)
504 smb_panic("smb_xmalloc: called with zero size.\n");
505 if ((p = malloc(size)) == NULL)
506 smb_panic("smb_xmalloc: malloc fail.\n");
511 Memdup with smb_panic on fail.
514 void *smb_xmemdup(const void *p, size_t size)
517 p2 = smb_xmalloc(size);
523 strdup that aborts on malloc fail.
526 char *smb_xstrdup(const char *s)
528 char *s1 = strdup(s);
530 smb_panic("smb_xstrdup: malloc fail\n");
535 /*****************************************************************
536 Like strdup but for memory.
537 *****************************************************************/
539 void *memdup(const void *p, size_t size)
551 /*****************************************************************
552 Get local hostname and cache result.
553 *****************************************************************/
555 char *myhostname(TALLOC_CTX *mem_ctx)
558 myname = get_myname();
559 ret = talloc_strdup(mem_ctx, myname);
565 /**********************************************************************
566 Converts a name to a fully qalified domain name.
567 ***********************************************************************/
569 char *name_to_fqdn(TALLOC_CTX *mem_ctx, const char *name)
571 struct hostent *hp = sys_gethostbyname(name);
572 if ( hp && hp->h_name && *hp->h_name ) {
573 DEBUG(10,("name_to_fqdn: lookup for %s -> %s.\n", name, hp->h_name));
574 return talloc_strdup(mem_ctx, hp->h_name);
576 DEBUG(10,("name_to_fqdn: lookup for %s failed.\n", name));
577 return talloc_strdup(mem_ctx, name);
582 /*****************************************************************
583 A useful function for returning a path in the Samba lock directory.
584 *****************************************************************/
585 char *lock_path(TALLOC_CTX* mem_ctx, const char *name)
591 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
592 return talloc_strdup(mem_ctx, name);
595 dname = talloc_strdup(mem_ctx, lp_lockdir());
596 trim_string(dname,"","/");
598 if (!directory_exist(dname)) {
602 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
610 /*****************************************************************
611 A useful function for returning a path in the Samba piddir directory.
612 *****************************************************************/
613 char *pid_path(TALLOC_CTX* mem_ctx, const char *name)
617 dname = talloc_strdup(mem_ctx, lp_piddir());
618 trim_string(dname,"","/");
620 if (!directory_exist(dname)) {
624 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
633 * @brief Returns an absolute path to a file in the Samba lib directory.
635 * @param name File to find, relative to LIBDIR.
637 * @retval Pointer to a talloc'ed string containing the full path.
640 char *lib_path(TALLOC_CTX* mem_ctx, const char *name)
643 fname = talloc_asprintf(mem_ctx, "%s/%s", dyn_LIBDIR, name);
648 * @brief Returns an absolute path to a file in the Samba private directory.
650 * @param name File to find, relative to PRIVATEDIR.
651 * if name is not relative, then use it as-is
653 * @retval Pointer to a talloc'ed string containing the full path.
655 char *private_path(TALLOC_CTX* mem_ctx, const char *name)
661 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
662 return talloc_strdup(mem_ctx, name);
664 fname = talloc_asprintf(mem_ctx, "%s/%s", lp_private_dir(), name);
669 return a path in the smbd.tmp directory, where all temporary file
670 for smbd go. If NULL is passed for name then return the directory
673 char *smbd_tmp_path(TALLOC_CTX *mem_ctx, const char *name)
677 dname = pid_path(mem_ctx, "smbd.tmp");
678 if (!directory_exist(dname)) {
686 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
692 char *modules_path(TALLOC_CTX* mem_ctx, const char *name)
694 return talloc_asprintf(mem_ctx, "%s/%s", dyn_MODULESDIR, name);
697 init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
699 char *path = modules_path(mem_ctx, subsystem);
702 ret = load_modules(mem_ctx, path);
709 void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
711 #ifdef DEBUG_PASSWORD
712 DEBUG(11, ("%s", msg));
713 if (data != NULL && len > 0)
715 dump_data(11, data, len);
721 /* see if a range of memory is all zero. A NULL pointer is considered
723 BOOL all_zero(const uint8_t *ptr, uint_t size)
726 if (!ptr) return True;
727 for (i=0;i<size;i++) {
728 if (ptr[i]) return False;
734 realloc an array, checking for integer overflow in the array size
736 void *realloc_array(void *ptr, size_t el_size, unsigned count)
738 #define MAX_MALLOC_SIZE 0x7fffffff
740 count >= MAX_MALLOC_SIZE/el_size) {
744 return malloc(el_size * count);
746 return realloc(ptr, el_size * count);