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file_perm.c
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1 /*-------------------------------------------------------------------------
2  *
3  * File and directory permission routines
4  *
5  *
6  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * src/common/file_perm.c
10  *
11  *-------------------------------------------------------------------------
12  */
13 #include "c.h"
14 
15 #include "common/file_perm.h"
16 
17 /* Modes for creating directories and files in the data directory */
20 
21 /*
22  * Mode mask to pass to umask(). This is more of a preventative measure since
23  * all file/directory creates should be performed using the create modes above.
24  */
26 
27 /*
28  * Set create modes and mask to use when writing to PGDATA based on the data
29  * directory mode passed. If group read/execute are present in the mode, then
30  * create modes and mask will be relaxed to allow group read/execute on all
31  * newly created files and directories.
32  */
33 void
35 {
36  /* If the data directory mode has group access */
37  if ((PG_DIR_MODE_GROUP & dataDirMode) == PG_DIR_MODE_GROUP)
38  {
42  }
43  /* Else use default permissions */
44  else
45  {
49  }
50 }
51 
52 #ifdef FRONTEND
53 
54 /*
55  * Get the create modes and mask to use when writing to PGDATA by examining the
56  * mode of the PGDATA directory and calling SetDataDirectoryCreatePerm().
57  *
58  * Errors are not handled here and should be reported by the application when
59  * false is returned.
60  *
61  * Suppress when on Windows, because there may not be proper support for Unix-y
62  * file permissions.
63  */
64 bool
65 GetDataDirectoryCreatePerm(const char *dataDir)
66 {
67 #if !defined(WIN32) && !defined(__CYGWIN__)
68  struct stat statBuf;
69 
70  /*
71  * If an error occurs getting the mode then return false. The caller is
72  * responsible for generating an error, if appropriate, indicating that we
73  * were unable to access the data directory.
74  */
75  if (stat(dataDir, &statBuf) == -1)
76  return false;
77 
78  /* Set permissions */
79  SetDataDirectoryCreatePerm(statBuf.st_mode);
80  return true;
81 #else /* !defined(WIN32) && !defined(__CYGWIN__) */
82  /*
83  * On Windows, we don't have anything to do here since they don't have
84  * Unix-y permissions.
85  */
86  return true;
87 #endif
88 }
89 
90 
91 #endif /* FRONTEND */
int pg_file_create_mode
Definition: file_perm.c:19
#define PG_DIR_MODE_OWNER
Definition: file_perm.h:32
#define PG_FILE_MODE_GROUP
Definition: file_perm.h:41
#define PG_MODE_MASK_GROUP
Definition: file_perm.h:29
#define stat(a, b)
Definition: win32_port.h:255
int pg_dir_create_mode
Definition: file_perm.c:18
#define PG_DIR_MODE_GROUP
Definition: file_perm.h:35
#define PG_MODE_MASK_OWNER
Definition: file_perm.h:24
#define PG_FILE_MODE_OWNER
Definition: file_perm.h:38
bool GetDataDirectoryCreatePerm(const char *dataDir)
void SetDataDirectoryCreatePerm(int dataDirMode)
Definition: file_perm.c:34
int pg_mode_mask
Definition: file_perm.c:25