summaryrefslogtreecommitdiff
path: root/source3/lib/system.c
blob: f5fbae53abebdccaa9b06bb938c11f9ef4069a84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Samba system utilities
   Copyright (C) Andrew Tridgell 1992-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

extern int DEBUGLEVEL;

/*
   The idea is that this file will eventually have wrappers around all
   important system calls in samba. The aims are:

   - to enable easier porting by putting OS dependent stuff in here

   - to allow for hooks into other "pseudo-filesystems"

   - to allow easier integration of things like the japanese extensions

   - to support the philosophy of Samba to expose the features of
     the OS within the SMB model. In general whatever file/printer/variable
     expansions/etc make sense to the OS should be acceptable to Samba.
*/


/*******************************************************************
this replaces the normal select() system call
return if some data has arrived on one of the file descriptors
return -1 means error
********************************************************************/
#ifdef NO_SELECT
static int pollfd(int fd)
{
  int     r=0;

#ifdef HAS_RDCHK
  r = rdchk(fd);
#elif defined(TCRDCHK)
  (void)ioctl(fd, TCRDCHK, &r);
#else
  (void)ioctl(fd, FIONREAD, &r);
#endif

  return(r);
}

int sys_select(fd_set *fds,struct timeval *tval)
{
  fd_set fds2;
  int counter=0;
  int found=0;

  FD_ZERO(&fds2);

  while (1) 
    {
      int i;
      for (i=0;i<255;i++) {
	if (FD_ISSET(i,fds) && pollfd(i)>0) {
	  found++;
	  FD_SET(i,&fds2);
	}
      }

      if (found) {
	memcpy((void *)fds,(void *)&fds2,sizeof(fds2));
	return(found);
      }
      
      if (tval && tval->tv_sec < counter) return(0);
      sleep(1);
      counter++;
    }
}

#else
int sys_select(fd_set *fds,struct timeval *tval)
{
  struct timeval t2;
  int selrtn;

  do {
    if (tval) memcpy((void *)&t2,(void *)tval,sizeof(t2));
    errno = 0;
    selrtn = select(255,SELECT_CAST fds,NULL,NULL,tval?&t2:NULL);
  } while (selrtn<0 && errno == EINTR);

  return(selrtn);
}
#endif


/*******************************************************************
just a unlink wrapper
********************************************************************/
int sys_unlink(char *fname)
{
  return(unlink(dos_to_unix(fname,False)));
}


/*******************************************************************
a simple open() wrapper
********************************************************************/
int sys_open(char *fname,int flags,int mode)
{
  return(open(dos_to_unix(fname,False),flags,mode));
}


/*******************************************************************
a simple opendir() wrapper
********************************************************************/
DIR *sys_opendir(char *dname)
{
  return(opendir(dos_to_unix(dname,False)));
}


/*******************************************************************
and a stat() wrapper
********************************************************************/
int sys_stat(char *fname,struct stat *sbuf)
{
  return(stat(dos_to_unix(fname,False),sbuf));
}

/*******************************************************************
The wait() calls vary between systems
********************************************************************/
int sys_waitpid(pid_t pid,int *status,int options)
{
#ifdef USE_WAITPID
  return waitpid(pid,status,options);
#else /* USE_WAITPID */
  return wait4(pid, status, options, NULL);
#endif /* USE_WAITPID */
}

/*******************************************************************
don't forget lstat()
********************************************************************/
int sys_lstat(char *fname,struct stat *sbuf)
{
  return(lstat(dos_to_unix(fname,False),sbuf));
}


/*******************************************************************
mkdir() gets a wrapper
********************************************************************/
int sys_mkdir(char *dname,int mode)
{
  return(mkdir(dos_to_unix(dname,False),mode));
}


/*******************************************************************
do does rmdir()
********************************************************************/
int sys_rmdir(char *dname)
{
  return(rmdir(dos_to_unix(dname,False)));
}


/*******************************************************************
I almost forgot chdir()
********************************************************************/
int sys_chdir(char *dname)
{
  return(chdir(dos_to_unix(dname,False)));
}


/*******************************************************************
now for utime()
********************************************************************/
int sys_utime(char *fname,struct utimbuf *times)
{
  /* if the modtime is 0 or -1 then ignore the call and
     return success */
  if (times->modtime == (time_t)0 || times->modtime == (time_t)-1)
    return 0;
  
  /* if the access time is 0 or -1 then set it to the modtime */
  if (times->actime == (time_t)0 || times->actime == (time_t)-1)
    times->actime = times->modtime;
   
  return(utime(dos_to_unix(fname,False),times));
}

/*********************************************************
for rename across filesystems Patch from Warren Birnbaum 
<warrenb@hpcvscdp.cv.hp.com>
**********************************************************/

static int copy_reg(char *source, const char *dest)
{
  struct stat source_stats;
  int ifd;
  int full_write();
  int safe_read();
  int ofd;
  char *buf;
  int len;                      /* Number of bytes read into `buf'. */

  lstat (source, &source_stats);
  if (!S_ISREG (source_stats.st_mode))
    {
      return 1;
    }

  if (unlink (dest) && errno != ENOENT)
    {
      return 1;
    }

  if((ifd = open (source, O_RDONLY, 0)) < 0)
    {
      return 1;
    }
  if((ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC, 0600)) < 0 )
    {
      close (ifd);
      return 1;
    }

  if((buf = malloc( COPYBUF_SIZE )) == NULL)
    {
      close (ifd);  
      close (ofd);  
      unlink (dest);
      return 1;
    }

  while ((len = read(ifd, buf, COPYBUF_SIZE)) > 0)
    {
      if (write_data(ofd, buf, len) < 0)
        {
          close (ifd);
          close (ofd);
          unlink (dest);
          free(buf);
          return 1;
        }
    }
  free(buf);
  if (len < 0)
    {
      close (ifd);
      close (ofd);
      unlink (dest);
      return 1;
    }

  if (close (ifd) < 0)
    {
      close (ofd);
      return 1;
    }
  if (close (ofd) < 0)
    {
      return 1;
    }

  /* chown turns off set[ug]id bits for non-root,
     so do the chmod last.  */

  /* Try to copy the old file's modtime and access time.  */
  {
    struct utimbuf tv;

    tv.actime = source_stats.st_atime;
    tv.modtime = source_stats.st_mtime;
    if (utime (dest, &tv))
      {
        return 1;
      }
  }

  /* Try to preserve ownership.  For non-root it might fail, but that's ok.
     But root probably wants to know, e.g. if NFS disallows it.  */
  if (chown (dest, source_stats.st_uid, source_stats.st_gid)
      && (errno != EPERM))
    {
      return 1;
    }

  if (chmod (dest, source_stats.st_mode & 07777))
    {
      return 1;
    }
  unlink (source);
  return 0;
}

/*******************************************************************
for rename()
********************************************************************/
int sys_rename(char *from, char *to)
{
    int rcode;  
    pstring zfrom, zto;

    pstrcpy (zfrom, dos_to_unix (from, False));
    pstrcpy (zto, dos_to_unix (to, False));
    rcode = rename (zfrom, zto);

    if (errno == EXDEV) 
      {
        /* Rename across filesystems needed. */
        rcode = copy_reg (zfrom, zto);        
      }
    return rcode;
}

/*******************************************************************
for chmod
********************************************************************/
int sys_chmod(char *fname,int mode)
{
  return(chmod(dos_to_unix(fname,False),mode));
}

/*******************************************************************
for getwd
********************************************************************/
char *sys_getwd(char *s)
{
  char *wd;
#ifdef USE_GETCWD
  wd = (char *) getcwd (s, sizeof (pstring));
#else
  wd = (char *) getwd (s);
#endif
  if (wd)
    unix_to_dos (wd, True);
  return wd;
}

/*******************************************************************
chown isn't used much but OS/2 doesn't have it
********************************************************************/
int sys_chown(char *fname,int uid,int gid)
{
#ifdef NO_CHOWN
  DEBUG(1,("Warning - chown(%s,%d,%d) not done\n",fname,uid,gid));
#else
  return(chown(fname,uid,gid));
#endif
}

/*******************************************************************
os/2 also doesn't have chroot
********************************************************************/
int sys_chroot(char *dname)
{
#ifdef NO_CHROOT
  DEBUG(1,("Warning - chroot(%s) not done\n",dname));
#else
  return(chroot(dname));
#endif
}

/**************************************************************************
A wrapper for gethostbyname() that tries avoids looking up hostnames 
in the root domain, which can cause dial-on-demand links to come up for no
apparent reason.
****************************************************************************/
struct hostent *sys_gethostbyname(char *name)
{
#ifdef REDUCE_ROOT_DNS_LOOKUPS
  char query[256], hostname[256];
  char *domain;

  /* Does this name have any dots in it? If so, make no change */

  if (strchr(name, '.'))
    return(gethostbyname(name));

  /* Get my hostname, which should have domain name 
     attached. If not, just do the gethostname on the
     original string. 
  */

  gethostname(hostname, sizeof(hostname) - 1);
  hostname[sizeof(hostname) - 1] = 0;
  if ((domain = strchr(hostname, '.')) == NULL)
    return(gethostbyname(name));

  /* Attach domain name to query and do modified query.
     If names too large, just do gethostname on the
     original string.
  */

  if((strlen(name) + strlen(domain)) >= sizeof(query))
    return(gethostbyname(name));

  sprintf(query, "%s%s", name, domain);
  return(gethostbyname(query));
#else /* REDUCE_ROOT_DNS_LOOKUPS */
  return(gethostbyname(name));
#endif /* REDUCE_ROOT_DNS_LOOKUPS */
}