1 /****************************************************************************
2 * Copyright (c) 1998-2006,2007 Free Software Foundation, Inc. *
3 * *
4 * Permission is hereby granted, free of charge, to any person obtaining a *
5 * copy of this software and associated documentation files (the *
6 * "Software"), to deal in the Software without restriction, including *
7 * without limitation the rights to use, copy, modify, merge, publish, *
8 * distribute, distribute with modifications, sublicense, and/or sell *
9 * copies of the Software, and to permit persons to whom the Software is *
10 * furnished to do so, subject to the following conditions: *
11 * *
12 * The above copyright notice and this permission notice shall be included *
13 * in all copies or substantial portions of the Software. *
14 * *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
22 * *
23 * Except as contained in this notice, the name(s) of the above copyright *
24 * holders shall not be used in advertising or otherwise to promote the *
25 * sale, use or other dealings in this Software without prior written *
26 * authorization. *
27 ****************************************************************************/
28
29 /****************************************************************************
30 * Author: Thomas E. Dickey *
31 ****************************************************************************/
32
33 #include <curses.priv.h>
34
35 #include <ctype.h>
36 #include <sys/stat.h>
37
38 #include <tic.h>
39 #include <nc_alloc.h>
40
41 MODULE_ID("$Id: access.c,v 1.14 2007/11/18 00:57:53 tom Exp $")
42
43 #define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c))
44
NCURSES_EXPORT(char *)45 NCURSES_EXPORT(char *)
46 _nc_rootname(char *path)
47 {
48 char *result = _nc_basename(path);
49 #if !MIXEDCASE_FILENAMES || defined(PROG_EXT)
50 static char *temp;
51 char *s;
52
53 temp = strdup(result);
54 result = temp;
55 #if !MIXEDCASE_FILENAMES
56 for (s = result; *s != '\0'; ++s) {
57 *s = LOWERCASE(*s);
58 }
59 #endif
60 #if defined(PROG_EXT)
61 if ((s = strrchr(result, '.')) != 0) {
62 if (!strcmp(s, PROG_EXT))
63 *s = '\0';
64 }
65 #endif
66 #endif
67 return result;
68 }
69
70 /*
71 * Check if a string appears to be an absolute pathname.
72 */
73 NCURSES_EXPORT(bool)
_nc_is_abs_path(const char * path)74 _nc_is_abs_path(const char *path)
75 {
76 #if defined(__EMX__) || defined(__DJGPP__)
77 #define is_pathname(s) ((((s) != 0) && ((s)[0] == '/')) \
78 || (((s)[0] != 0) && ((s)[1] == ':')))
79 #else
80 #define is_pathname(s) ((s) != 0 && (s)[0] == '/')
81 #endif
82 return is_pathname(path);
83 }
84
85 /*
86 * Return index of the basename
87 */
88 NCURSES_EXPORT(unsigned)
_nc_pathlast(const char * path)89 _nc_pathlast(const char *path)
90 {
91 const char *test = strrchr(path, '/');
92 #ifdef __EMX__
93 if (test == 0)
94 test = strrchr(path, '\\');
95 #endif
96 if (test == 0)
97 test = path;
98 else
99 test++;
100 return (test - path);
101 }
102
103 NCURSES_EXPORT(char *)
_nc_basename(char * path)104 _nc_basename(char *path)
105 {
106 return path + _nc_pathlast(path);
107 }
108
109 NCURSES_EXPORT(int)
_nc_access(const char * path,int mode)110 _nc_access(const char *path, int mode)
111 {
112 if (access(path, mode) < 0) {
113 if ((mode & W_OK) != 0
114 && errno == ENOENT
115 && strlen(path) < PATH_MAX) {
116 char head[PATH_MAX];
117 char *leaf = _nc_basename(strcpy(head, path));
118
119 if (leaf == 0)
120 leaf = head;
121 *leaf = '\0';
122 if (head == leaf)
123 (void) strcpy(head, ".");
124
125 return access(head, R_OK | W_OK | X_OK);
126 }
127 return -1;
128 }
129 return 0;
130 }
131
132 NCURSES_EXPORT(bool)
_nc_is_dir_path(const char * path)133 _nc_is_dir_path(const char *path)
134 {
135 bool result = FALSE;
136 struct stat sb;
137
138 if (stat(path, &sb) == 0
139 && (sb.st_mode & S_IFMT) == S_IFDIR) {
140 result = TRUE;
141 }
142 return result;
143 }
144
145 NCURSES_EXPORT(bool)
_nc_is_file_path(const char * path)146 _nc_is_file_path(const char *path)
147 {
148 bool result = FALSE;
149 struct stat sb;
150
151 if (stat(path, &sb) == 0
152 && (sb.st_mode & S_IFMT) == S_IFREG) {
153 result = TRUE;
154 }
155 return result;
156 }
157
158 #ifndef USE_ROOT_ENVIRON
159 /*
160 * Returns true if we allow application to use environment variables that are
161 * used for searching lists of directories, etc.
162 */
163 NCURSES_EXPORT(int)
_nc_env_access(void)164 _nc_env_access(void)
165 {
166 #if HAVE_ISSETUGID
167 if (issetugid())
168 return FALSE;
169 #elif HAVE_GETEUID && HAVE_GETEGID
170 if (getuid() != geteuid()
171 || getgid() != getegid())
172 return FALSE;
173 #endif
174 return getuid() != 0 && geteuid() != 0; /* ...finally, disallow root */
175 }
176 #endif
177