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 "system/network.h"
27 #include "system/iconv.h"
28 #include "system/filesys.h"
32 * @brief Misc utility functions
36 Find a suitable temporary directory. The result should be copied immediately
37 as it may be overwritten by a subsequent call.
39 _PUBLIC_ const char *tmpdir(void)
42 if ((p = getenv("TMPDIR")))
49 Check if a file exists - call vfs_file_exist for samba files.
51 _PUBLIC_ BOOL file_exist(const char *fname)
55 if (stat(fname, &st) != 0) {
59 return ((S_ISREG(st.st_mode)) || (S_ISFIFO(st.st_mode)));
63 Check a files mod time.
66 _PUBLIC_ time_t file_modtime(const char *fname)
70 if (stat(fname,&st) != 0)
77 Check if a directory exists.
80 _PUBLIC_ BOOL directory_exist(const char *dname)
85 if (stat(dname,&st) != 0) {
89 ret = S_ISDIR(st.st_mode);
96 * Try to create the specified directory if it didn't exist.
98 * @retval True if the directory already existed and has the right permissions
99 * or was successfully created.
101 _PUBLIC_ BOOL directory_create_or_exist(const char *dname, uid_t uid,
107 old_umask = umask(0);
108 if (lstat(dname, &st) == -1) {
109 if (errno == ENOENT) {
110 /* Create directory */
111 if (mkdir(dname, dir_perms) == -1) {
112 DEBUG(0, ("error creating directory "
119 DEBUG(0, ("lstat failed on directory %s: %s\n",
120 dname, strerror(errno)));
125 /* Check ownership and permission on existing directory */
126 if (!S_ISDIR(st.st_mode)) {
127 DEBUG(0, ("directory %s isn't a directory\n",
132 if ((st.st_uid != uid) ||
133 ((st.st_mode & 0777) != dir_perms)) {
134 DEBUG(0, ("invalid permissions on directory "
144 /*******************************************************************
145 Close the low 3 fd's and open dev/null in their place.
146 ********************************************************************/
147 static void close_low_fds(BOOL stderr_too)
159 /* try and use up these file descriptors, so silly
160 library routines writing to stdout etc won't cause havoc */
162 if (i == 2 && !stderr_too)
165 fd = open("/dev/null",O_RDWR,0);
167 fd = open("/dev/null",O_WRONLY,0);
169 DEBUG(0,("Can't open /dev/null\n"));
173 DEBUG(0,("Didn't get file descriptor %d\n",i));
181 Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available,
187 _PUBLIC_ int set_blocking(int fd, BOOL set)
191 #define FLAG_TO_SET O_NONBLOCK
194 #define FLAG_TO_SET O_NDELAY
196 #define FLAG_TO_SET FNDELAY
200 if((val = fcntl(fd, F_GETFL, 0)) == -1)
202 if(set) /* Turn blocking on - ie. clear nonblock flag */
206 return fcntl( fd, F_SETFL, val);
212 Sleep for a specified number of milliseconds.
215 _PUBLIC_ void msleep(unsigned int t)
219 tval.tv_sec = t/1000;
220 tval.tv_usec = 1000*(t%1000);
221 /* this should be the real select - do NOT replace
223 select(0,NULL,NULL,NULL,&tval);
227 Become a daemon, discarding the controlling terminal.
230 _PUBLIC_ void become_daemon(BOOL Fork)
238 /* detach from the terminal */
241 #elif defined(TIOCNOTTY)
243 int i = open("/dev/tty", O_RDWR, 0);
245 ioctl(i, (int) TIOCNOTTY, (char *)0);
249 #endif /* HAVE_SETSID */
251 /* Close fd's 0,1,2. Needed if started by rsh */
252 close_low_fds(False); /* Don't close stderr, let the debug system
253 attach it to the logfile */
258 Free memory, checks for NULL.
259 Use directly SAFE_FREE()
260 Exists only because we need to pass a function pointer somewhere --SSS
263 _PUBLIC_ void safe_free(void *p)
270 Get my own name, return in malloc'ed storage.
273 _PUBLIC_ char* get_myname(void)
276 const int host_name_max = 255;
279 hostname = malloc(host_name_max+1);
282 /* get my host name */
283 if (gethostname(hostname, host_name_max+1) == -1) {
284 DEBUG(0,("gethostname failed\n"));
288 /* Ensure null termination. */
289 hostname[host_name_max] = '\0';
291 /* split off any parts after an initial . */
292 p = strchr_m(hostname,'.');
301 Return true if a string could be a pure IP address.
304 _PUBLIC_ BOOL is_ipaddress(const char *str)
306 BOOL pure_address = True;
309 for (i=0; pure_address && str[i]; i++)
310 if (!(isdigit((int)str[i]) || str[i] == '.'))
311 pure_address = False;
313 /* Check that a pure number is not misinterpreted as an IP */
314 pure_address = pure_address && (strchr_m(str, '.') != NULL);
320 Interpret an internet address or name into an IP address in 4 byte form.
322 _PUBLIC_ uint32_t interpret_addr(const char *str)
327 if (str == NULL || *str == 0 ||
328 strcmp(str,"0.0.0.0") == 0) {
331 if (strcmp(str,"255.255.255.255") == 0) {
334 /* recognise 'localhost' as a special name. This fixes problems with
335 some hosts that don't have localhost in /etc/hosts */
336 if (strcasecmp(str,"localhost") == 0) {
340 /* if it's in the form of an IP address then get the lib to interpret it */
341 if (is_ipaddress(str)) {
342 res = inet_addr(str);
344 /* otherwise assume it's a network name of some sort and use
346 if ((hp = sys_gethostbyname(str)) == 0) {
347 DEBUG(3,("sys_gethostbyname: Unknown host. %s\n",str));
351 if(hp->h_addr == NULL) {
352 DEBUG(3,("sys_gethostbyname: host address is invalid for host %s\n",str));
355 memcpy((char *)&res,(char *)hp->h_addr, 4);
358 if (res == (uint32_t)-1)
365 A convenient addition to interpret_addr().
367 _PUBLIC_ struct ipv4_addr interpret_addr2(const char *str)
369 struct ipv4_addr ret;
370 uint32_t a = interpret_addr(str);
376 Check if an IP is the 0.0.0.0.
379 _PUBLIC_ BOOL is_zero_ip(struct ipv4_addr ip)
385 Are two IPs on the same subnet?
388 _PUBLIC_ BOOL same_net(struct ipv4_addr ip1,struct ipv4_addr ip2,struct ipv4_addr mask)
390 uint32_t net1,net2,nmask;
392 nmask = ntohl(mask.addr);
393 net1 = ntohl(ip1.addr);
394 net2 = ntohl(ip2.addr);
396 return((net1 & nmask) == (net2 & nmask));
401 Check if a process exists. Does this work on all unixes?
404 _PUBLIC_ BOOL process_exists(pid_t pid)
406 /* Doing kill with a non-positive pid causes messages to be
407 * sent to places we don't want. */
409 return(kill(pid,0) == 0 || errno != ESRCH);
413 Simple routine to do POSIX file locking. Cruft in NFS and 64->32 bit mapping
414 is dealt with in posix.c
417 _PUBLIC_ BOOL fcntl_lock(int fd, int op, off_t offset, off_t count, int type)
422 DEBUG(8,("fcntl_lock %d %d %.0f %.0f %d\n",fd,op,(double)offset,(double)count,type));
425 lock.l_whence = SEEK_SET;
426 lock.l_start = offset;
430 ret = fcntl(fd,op,&lock);
432 if (ret == -1 && errno != 0)
433 DEBUG(3,("fcntl_lock: fcntl lock gave errno %d (%s)\n",errno,strerror(errno)));
438 (lock.l_type != F_UNLCK) &&
440 (lock.l_pid != getpid())) {
441 DEBUG(3,("fcntl_lock: fd %d is locked by pid %d\n",fd,(int)lock.l_pid));
445 /* it must be not locked or locked by me */
449 /* a lock set or unset */
451 DEBUG(3,("fcntl_lock: lock failed at offset %.0f count %.0f op %d type %d (%s)\n",
452 (double)offset,(double)count,op,type,strerror(errno)));
456 /* everything went OK */
457 DEBUG(8,("fcntl_lock: Lock call successful\n"));
463 static void print_asc(int level, const uint8_t *buf,int len)
467 DEBUGADD(level,("%c", isprint(buf[i])?buf[i]:'.'));
471 * Write dump of binary data to the log file.
473 * The data is only written if the log level is at least level.
475 _PUBLIC_ void dump_data(int level, const uint8_t *buf,int len)
480 if (!DEBUGLVL(level)) return;
482 DEBUGADD(level,("[%03X] ",i));
484 DEBUGADD(level,("%02X ",(int)buf[i]));
486 if (i%8 == 0) DEBUGADD(level,(" "));
488 print_asc(level,&buf[i-16],8); DEBUGADD(level,(" "));
489 print_asc(level,&buf[i-8],8); DEBUGADD(level,("\n"));
490 if (i<len) DEBUGADD(level,("[%03X] ",i));
496 DEBUGADD(level,(" "));
497 if (n>8) DEBUGADD(level,(" "));
498 while (n--) DEBUGADD(level,(" "));
500 print_asc(level,&buf[i-(i%16)],n); DEBUGADD(level,( " " ));
502 if (n>0) print_asc(level,&buf[i-n],n);
503 DEBUGADD(level,("\n"));
508 malloc that aborts with smb_panic on fail or zero size.
511 _PUBLIC_ void *smb_xmalloc(size_t size)
515 smb_panic("smb_xmalloc: called with zero size.\n");
516 if ((p = malloc(size)) == NULL)
517 smb_panic("smb_xmalloc: malloc fail.\n");
522 Memdup with smb_panic on fail.
525 _PUBLIC_ void *smb_xmemdup(const void *p, size_t size)
528 p2 = smb_xmalloc(size);
534 strdup that aborts on malloc fail.
537 _PUBLIC_ char *smb_xstrdup(const char *s)
539 char *s1 = strdup(s);
541 smb_panic("smb_xstrdup: malloc fail\n");
547 Like strdup but for memory.
550 _PUBLIC_ void *memdup(const void *p, size_t size)
563 * Write a password to the log file.
565 * @note Only actually does something if DEBUG_PASSWORD was defined during
568 _PUBLIC_ void dump_data_pw(const char *msg, const uint8_t * data, size_t len)
570 #ifdef DEBUG_PASSWORD
571 DEBUG(11, ("%s", msg));
572 if (data != NULL && len > 0)
574 dump_data(11, data, len);
581 * see if a range of memory is all zero. A NULL pointer is considered
584 _PUBLIC_ BOOL all_zero(const uint8_t *ptr, size_t size)
587 if (!ptr) return True;
588 for (i=0;i<size;i++) {
589 if (ptr[i]) return False;
595 realloc an array, checking for integer overflow in the array size
597 _PUBLIC_ void *realloc_array(void *ptr, size_t el_size, unsigned count)
599 #define MAX_MALLOC_SIZE 0x7fffffff
601 count >= MAX_MALLOC_SIZE/el_size) {
605 return malloc(el_size * count);
607 return realloc(ptr, el_size * count);