GRASS GIS 7 Programmer's Manual  7.5.svn(2017)-r71785
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mapset_msc.c
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1 /*!
2  \file lib/gis/mapset_msc.c
3 
4  \brief GIS library - Mapset user permission routines.
5 
6  (C) 1999-2014 The GRASS development team
7 
8  This program is free software under the GNU General Public License
9  (>=v2). Read the file COPYING that comes with GRASS for details.
10  */
11 
12 #include <grass/config.h>
13 #include <string.h>
14 #include <unistd.h>
15 #include <stdlib.h>
16 #include <errno.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <grass/gis.h>
20 #include <grass/glocale.h>
21 
22 static int make_mapset_element(const char *, const char *);
23 
24 /*!
25  \brief Create element in the current mapset.
26 
27  Make the specified element in the current mapset will check for the
28  existence of the element and do nothing if it is found so this
29  routine can be called even if the element already exists.
30 
31  Calls G_fatal_error() on failure.
32 
33  \param p_element element to be created in mapset
34 
35  \return 0 no element defined
36  \return 1 on success
37  */
38 int G_make_mapset_element(const char *p_element)
39 {
40  char path[GPATH_MAX];
41 
42  G_file_name(path, NULL, NULL, G_mapset());
43  return make_mapset_element(path, p_element);
44 }
45 
46 /*!
47  \brief Create element in the temporary directory.
48 
49  See G_file_name_tmp() for details.
50 
51  \param p_element element to be created in mapset
52 
53  \return 0 no element defined
54  \return 1 on success
55  */
56 int G_make_mapset_element_tmp(const char *p_element)
57 {
58  char path[GPATH_MAX];
59 
60  G_file_name_tmp(path, NULL, NULL, G_mapset());
61  return make_mapset_element(path, p_element);
62 }
63 
64 int make_mapset_element(const char *p_path, const char *p_element)
65 {
66  char path[GPATH_MAX], *p;
67  const char *element;
68 
69  element = p_element;
70  if (*element == 0)
71  return 0;
72 
73  strncpy(path, p_path, GPATH_MAX);
74  p = path;
75  while (*p)
76  p++;
77  /* add trailing slash if missing */
78  --p;
79  if (*p++ != '/') {
80  *p++ = '/';
81  *p = 0;
82  }
83 
84  /* now append element, one directory at a time, to path */
85  while (1) {
86  if (*element == '/' || *element == 0) {
87  *p = 0;
88  if (access(path, 0) != 0) { /* directory not yet created */
89  if (G_mkdir(path) != 0)
90  G_fatal_error(_("Unable to make mapset element %s (%s): %s"),
91  p_element, path, strerror(errno));
92  }
93  if (access(path, 0) != 0) /* directory not accessible */
94  G_fatal_error(_("Unable to access mapset element %s (%s): %s"),
95  p_element, path, strerror(errno));
96  if (*element == 0)
97  return 1;
98  }
99  *p++ = *element++;
100  }
101 }
102 
103 /*!
104  \brief Create misc element in the current mapset.
105 
106  \param dir directory path
107  \param name element to be created in mapset
108 
109  \return 0 no element defined
110  \return 1 on success
111  */
112 int G__make_mapset_element_misc(const char *dir, const char *name)
113 {
114  char buf[GNAME_MAX * 2 + 1];
115 
116  sprintf(buf, "%s/%s", dir, name);
117  return G_make_mapset_element(buf);
118 }
119 
120 static int check_owner(const struct stat *info)
121 {
122 #if defined(__MINGW32__) || defined(SKIP_MAPSET_OWN_CHK)
123  return 1;
124 #else
125  const char *check = getenv("GRASS_SKIP_MAPSET_OWNER_CHECK");
126  if (check && *check)
127  return 1;
128  if (info->st_uid != getuid())
129  return 0;
130  if (info->st_uid != geteuid())
131  return 0;
132  return 1;
133 #endif
134 }
135 
136 /*!
137  \brief Check for user mapset permission
138 
139  \param mapset mapset name
140 
141  \return 1 mapset exists, and user has permission
142  \return 0 mapset exists, BUT user denied permission
143  \return -1 mapset does not exist
144  */
145 int G_mapset_permissions(const char *mapset)
146 {
147  char path[GPATH_MAX];
148  struct stat info;
149 
150  G_file_name(path, "", "", mapset);
151 
152  if (G_stat(path, &info) != 0)
153  return -1;
154  if (!S_ISDIR(info.st_mode))
155  return -1;
156 
157  if (!check_owner(&info))
158  return 0;
159 
160  return 1;
161 }
162 
163 /*!
164  \brief Check for user mapset permission
165 
166  \param gisdbase full path to GISDBASE
167  \param location location name
168  \param mapset mapset name
169 
170  \return 1 mapset exists, and user has permission
171  \return 0 mapset exists, BUT user denied permission
172  \return -1 mapset does not exist
173  */
174 int G_mapset_permissions2(const char *gisdbase, const char *location,
175  const char *mapset)
176 {
177  char path[GPATH_MAX];
178  struct stat info;
179 
180  sprintf(path, "%s/%s/%s", gisdbase, location, mapset);
181 
182  if (G_stat(path, &info) != 0)
183  return -1;
184  if (!S_ISDIR(info.st_mode))
185  return -1;
186 
187  if (!check_owner(&info))
188  return 0;
189 
190  return 1;
191 }
int G_make_mapset_element(const char *p_element)
Create element in the current mapset.
Definition: mapset_msc.c:38
int G_stat(const char *file_name, struct stat *buf)
Get file status.
Definition: paths.c:128
int G_mkdir(const char *path)
Creates a new directory.
Definition: paths.c:27
int G_mapset_permissions(const char *mapset)
Check for user mapset permission.
Definition: mapset_msc.c:145
char * G_file_name_tmp(char *path, const char *element, const char *name, const char *mapset)
Builds full path names to GIS data files in temporary directory (for internal use only) ...
Definition: file_name.c:80
#define NULL
Definition: ccmath.h:32
void G_fatal_error(const char *msg,...)
Print a fatal error message to stderr.
Definition: gis/error.c:159
Definition: lidar.h:89
char * G_file_name(char *path, const char *element, const char *name, const char *mapset)
Builds full path names to GIS data files.
Definition: file_name.c:38
#define GPATH_MAX
Definition: gis.h:151
int G_mapset_permissions2(const char *gisdbase, const char *location, const char *mapset)
Check for user mapset permission.
Definition: mapset_msc.c:174
int G__make_mapset_element_misc(const char *dir, const char *name)
Create misc element in the current mapset.
Definition: mapset_msc.c:112
#define GNAME_MAX
Definition: gis.h:148
Definition: path.h:16
#define _(str)
Definition: glocale.h:13
const char * G_mapset(void)
Get current mapset name.
Definition: gis/mapset.c:33
int G_make_mapset_element_tmp(const char *p_element)
Create element in the temporary directory.
Definition: mapset_msc.c:56
const char * name
Definition: named_colr.c:7
char * getenv()