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);
96 _PUBLIC_ BOOL directory_create_or_exist(const char *dname, uid_t uid,
102 old_umask = umask(0);
103 if (lstat(dname, &st) == -1) {
104 if (errno == ENOENT) {
105 /* Create directory */
106 if (mkdir(dname, dir_perms) == -1) {
107 DEBUG(0, ("error creating directory "
114 DEBUG(0, ("lstat failed on directory %s: %s\n",
115 dname, strerror(errno)));
120 /* Check ownership and permission on existing directory */
121 if (!S_ISDIR(st.st_mode)) {
122 DEBUG(0, ("directory %s isn't a directory\n",
127 if ((st.st_uid != uid) ||
128 ((st.st_mode & 0777) != dir_perms)) {
129 DEBUG(0, ("invalid permissions on directory "
139 /*******************************************************************
140 Close the low 3 fd's and open dev/null in their place.
141 ********************************************************************/
142 static void close_low_fds(BOOL stderr_too)
154 /* try and use up these file descriptors, so silly
155 library routines writing to stdout etc won't cause havoc */
157 if (i == 2 && !stderr_too)
160 fd = open("/dev/null",O_RDWR,0);
162 fd = open("/dev/null",O_WRONLY,0);
164 DEBUG(0,("Can't open /dev/null\n"));
168 DEBUG(0,("Didn't get file descriptor %d\n",i));
176 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
182 _PUBLIC_ int set_blocking(int fd, BOOL set)
186 #define FLAG_TO_SET O_NONBLOCK
189 #define FLAG_TO_SET O_NDELAY
191 #define FLAG_TO_SET FNDELAY
195 if((val = fcntl(fd, F_GETFL, 0)) == -1)
197 if(set) /* Turn blocking on - ie. clear nonblock flag */
201 return fcntl( fd, F_SETFL, val);
207 Sleep for a specified number of milliseconds.
210 _PUBLIC_ void msleep(uint_t t)
214 tval.tv_sec = t/1000;
215 tval.tv_usec = 1000*(t%1000);
216 /* this should be the real select - do NOT replace
218 select(0,NULL,NULL,NULL,&tval);
222 Become a daemon, discarding the controlling terminal.
225 _PUBLIC_ void become_daemon(BOOL Fork)
233 /* detach from the terminal */
236 #elif defined(TIOCNOTTY)
238 int i = open("/dev/tty", O_RDWR, 0);
240 ioctl(i, (int) TIOCNOTTY, (char *)0);
244 #endif /* HAVE_SETSID */
246 /* Close fd's 0,1,2. Needed if started by rsh */
247 close_low_fds(False); /* Don't close stderr, let the debug system
248 attach it to the logfile */
253 Free memory, checks for NULL.
254 Use directly SAFE_FREE()
255 Exists only because we need to pass a function pointer somewhere --SSS
258 _PUBLIC_ void safe_free(void *p)
265 see if a string matches either our primary or one of our secondary
266 netbios aliases. do a case insensitive match
268 _PUBLIC_ BOOL is_myname(const char *name)
270 const char **aliases;
273 if (strcasecmp(name, lp_netbios_name()) == 0) {
277 aliases = lp_netbios_aliases();
278 for (i=0; aliases && aliases[i]; i++) {
279 if (strcasecmp(name, aliases[i]) == 0) {
289 Get my own name, return in malloc'ed storage.
292 _PUBLIC_ char* get_myname(void)
295 const int host_name_max = 255;
298 hostname = malloc(host_name_max+1);
301 /* get my host name */
302 if (gethostname(hostname, host_name_max+1) == -1) {
303 DEBUG(0,("gethostname failed\n"));
307 /* Ensure null termination. */
308 hostname[host_name_max] = '\0';
310 /* split off any parts after an initial . */
311 p = strchr_m(hostname,'.');
320 Return true if a string could be a pure IP address.
323 _PUBLIC_ BOOL is_ipaddress(const char *str)
325 BOOL pure_address = True;
328 for (i=0; pure_address && str[i]; i++)
329 if (!(isdigit((int)str[i]) || str[i] == '.'))
330 pure_address = False;
332 /* Check that a pure number is not misinterpreted as an IP */
333 pure_address = pure_address && (strchr_m(str, '.') != NULL);
339 Interpret an internet address or name into an IP address in 4 byte form.
341 _PUBLIC_ uint32_t interpret_addr(const char *str)
346 if (str == NULL || *str == 0 ||
347 strcmp(str,"0.0.0.0") == 0) {
350 if (strcmp(str,"255.255.255.255") == 0) {
353 /* recognise 'localhost' as a special name. This fixes problems with
354 some hosts that don't have localhost in /etc/hosts */
355 if (strcasecmp(str,"localhost") == 0) {
359 /* if it's in the form of an IP address then get the lib to interpret it */
360 if (is_ipaddress(str)) {
361 res = inet_addr(str);
363 /* otherwise assume it's a network name of some sort and use
365 if ((hp = sys_gethostbyname(str)) == 0) {
366 DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
370 if(hp->h_addr == NULL) {
371 DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
374 memcpy((char *)&res,(char *)hp->h_addr, 4);
377 if (res == (uint32_t)-1)
384 A convenient addition to interpret_addr().
386 _PUBLIC_ struct ipv4_addr interpret_addr2(const char *str)
388 struct ipv4_addr ret;
389 uint32_t a = interpret_addr(str);
395 Check if an IP is the 0.0.0.0.
398 _PUBLIC_ BOOL is_zero_ip(struct ipv4_addr ip)
404 Are two IPs on the same subnet?
407 _PUBLIC_ BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask)
409 uint32_t net1,net2,nmask;
411 nmask = ntohl(mask.addr);
412 net1 = ntohl(ip1.addr);
413 net2 = ntohl(ip2.addr);
415 return((net1 & nmask) == (net2 & nmask));
420 Check if a process exists. Does this work on all unixes?
423 _PUBLIC_ BOOL process_exists(pid_t pid)
425 /* Doing kill with a non-positive pid causes messages to be
426 * sent to places we don't want. */
428 return(kill(pid,0) == 0 || errno != ESRCH);
432 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
433 is dealt with in posix.c
436 _PUBLIC_ BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
441 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
444 lock.l_whence = SEEK_SET;
445 lock.l_start = offset;
449 ret = fcntl(fd,op,&lock);
451 if (ret == -1 && errno != 0)
452 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
457 (lock.l_type != F_UNLCK) &&
459 (lock.l_pid != getpid())) {
460 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
464 /* it must be not locked or locked by me */
468 /* a lock set or unset */
470 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
471 (double)offset,(double)count,op,type,strerror(errno)));
475 /* everything went OK */
476 DEBUG(8,("fcntl_lock: Lock call successful\n"));
482 static void print_asc(int level, const uint8_t *buf,int len)
486 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
489 _PUBLIC_ void dump_data(int level, const uint8_t *buf,int len)
494 if (!DEBUGLVL(level)) return;
496 DEBUGADD(level,("[%03X] ",i));
498 DEBUGADD(level,("%02X ",(int)buf[i]));
500 if (i%8 == 0) DEBUGADD(level,(" "));
502 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
503 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
504 if (i<len) DEBUGADD(level,("[%03X] ",i));
510 DEBUGADD(level,(" "));
511 if (n>8) DEBUGADD(level,(" "));
512 while (n--) DEBUGADD(level,(" "));
514 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
516 if (n>0) print_asc(level,&buf[i-n],n);
517 DEBUGADD(level,("\n"));
522 malloc that aborts with smb_panic on fail or zero size.
525 _PUBLIC_ void *smb_xmalloc(size_t size)
529 smb_panic("smb_xmalloc: called with zero size.\n");
530 if ((p = malloc(size)) == NULL)
531 smb_panic("smb_xmalloc: malloc fail.\n");
536 Memdup with smb_panic on fail.
539 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
542 p2 = smb_xmalloc(size);
548 strdup that aborts on malloc fail.
551 _PUBLIC_ char *smb_xstrdup(const char *s)
553 char *s1 = strdup(s);
555 smb_panic("smb_xstrdup: malloc fail\n");
561 Like strdup but for memory.
564 _PUBLIC_ void *memdup(const void *p, size_t size)
577 A useful function for returning a path in the Samba lock directory.
579 _PUBLIC_ char *lock_path(TALLOC_CTX* mem_ctx, const char *name)
585 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
586 return talloc_strdup(mem_ctx, name);
589 dname = talloc_strdup(mem_ctx, lp_lockdir());
590 trim_string(dname,"","/");
592 if (!directory_exist(dname)) {
596 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
605 A useful function for returning a path in the Samba piddir directory.
607 static char *pid_path(TALLOC_CTX* mem_ctx, const char *name)
611 dname = talloc_strdup(mem_ctx, lp_piddir());
612 trim_string(dname,"","/");
614 if (!directory_exist(dname)) {
618 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
627 * @brief Returns an absolute path to a file in the Samba lib directory.
629 * @param name File to find, relative to LIBDIR.
631 * @retval Pointer to a talloc'ed string containing the full path.
634 _PUBLIC_ char *lib_path(TALLOC_CTX* mem_ctx, const char *name)
637 fname = talloc_asprintf(mem_ctx, "%s/%s", dyn_LIBDIR, name);
642 * @brief Returns an absolute path to a file in the Samba private directory.
644 * @param name File to find, relative to PRIVATEDIR.
645 * if name is not relative, then use it as-is
647 * @retval Pointer to a talloc'ed string containing the full path.
649 _PUBLIC_ char *private_path(TALLOC_CTX* mem_ctx, const char *name)
655 if (name[0] == 0 || name[0] == '/' || strstr(name, ":/")) {
656 return talloc_strdup(mem_ctx, name);
658 fname = talloc_asprintf(mem_ctx, "%s/%s", lp_private_dir(), name);
663 return a path in the smbd.tmp directory, where all temporary file
664 for smbd go. If NULL is passed for name then return the directory
667 _PUBLIC_ char *smbd_tmp_path(TALLOC_CTX *mem_ctx, const char *name)
671 dname = pid_path(mem_ctx, "smbd.tmp");
672 if (!directory_exist(dname)) {
680 fname = talloc_asprintf(mem_ctx, "%s/%s", dname, name);
686 static char *modules_path(TALLOC_CTX* mem_ctx, const char *name)
688 return talloc_asprintf(mem_ctx, "%s/%s", dyn_MODULESDIR, name);
691 _PUBLIC_ init_module_fn *load_samba_modules(TALLOC_CTX *mem_ctx, const char *subsystem)
693 char *path = modules_path(mem_ctx, subsystem);
696 ret = load_modules(mem_ctx, path);
703 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
705 #ifdef DEBUG_PASSWORD
706 DEBUG(11, ("%s", msg));
707 if (data != NULL && len > 0)
709 dump_data(11, data, len);
716 * see if a range of memory is all zero. A NULL pointer is considered
719 _PUBLIC_ BOOL all_zero(const uint8_t *ptr, uint_t size)
722 if (!ptr) return True;
723 for (i=0;i<size;i++) {
724 if (ptr[i]) return False;
730 realloc an array, checking for integer overflow in the array size
732 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count)
734 #define MAX_MALLOC_SIZE 0x7fffffff
736 count >= MAX_MALLOC_SIZE/el_size) {
740 return malloc(el_size * count);
742 return realloc(ptr, el_size * count);