1/**************************************************************************** 2 * Copyright (c) 1998-2011,2012 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 37#include <tic.h> 38 39MODULE_ID("$Id: access.c,v 1.23 2012/09/01 19:21:29 tom Exp $") 40 41#ifdef __TANDEM 42#define ROOT_UID 65535 43#endif 44 45#ifndef ROOT_UID 46#define ROOT_UID 0 47#endif 48 49#define LOWERCASE(c) ((isalpha(UChar(c)) && isupper(UChar(c))) ? tolower(UChar(c)) : (c)) 50 51NCURSES_EXPORT(char *) 52_nc_rootname(char *path) 53{ 54 char *result = _nc_basename(path); 55#if !MIXEDCASE_FILENAMES || defined(PROG_EXT) 56 static char *temp; 57 char *s; 58 59 temp = strdup(result); 60 result = temp; 61#if !MIXEDCASE_FILENAMES 62 for (s = result; *s != '\0'; ++s) { 63 *s = (char) LOWERCASE(*s); 64 } 65#endif 66#if defined(PROG_EXT) 67 if ((s = strrchr(result, '.')) != 0) { 68 if (!strcmp(s, PROG_EXT)) 69 *s = '\0'; 70 } 71#endif 72#endif 73 return result; 74} 75 76/* 77 * Check if a string appears to be an absolute pathname. 78 */ 79NCURSES_EXPORT(bool) 80_nc_is_abs_path(const char *path) 81{ 82#if defined(__EMX__) || defined(__DJGPP__) 83#define is_pathname(s) ((((s) != 0) && ((s)[0] == '/')) \ 84 || (((s)[0] != 0) && ((s)[1] == ':'))) 85#else 86#define is_pathname(s) ((s) != 0 && (s)[0] == '/') 87#endif 88 return is_pathname(path); 89} 90 91/* 92 * Return index of the basename 93 */ 94NCURSES_EXPORT(unsigned) 95_nc_pathlast(const char *path) 96{ 97 const char *test = strrchr(path, '/'); 98#ifdef __EMX__ 99 if (test == 0) 100 test = strrchr(path, '\\'); 101#endif 102 if (test == 0) 103 test = path; 104 else 105 test++; 106 return (unsigned) (test - path); 107} 108 109NCURSES_EXPORT(char *) 110_nc_basename(char *path) 111{ 112 return path + _nc_pathlast(path); 113} 114 115NCURSES_EXPORT(int) 116_nc_access(const char *path, int mode) 117{ 118 int result; 119 120 if (path == 0) { 121 result = -1; 122 } else if (access(path, mode) < 0) { 123 if ((mode & W_OK) != 0 124 && errno == ENOENT 125 && strlen(path) < PATH_MAX) { 126 char head[PATH_MAX]; 127 char *leaf; 128 129 _nc_STRCPY(head, path, sizeof(head)); 130 leaf = _nc_basename(head); 131 if (leaf == 0) 132 leaf = head; 133 *leaf = '\0'; 134 if (head == leaf) 135 _nc_STRCPY(head, ".", sizeof(head)); 136 137 result = access(head, R_OK | W_OK | X_OK); 138 } else { 139 result = -1; 140 } 141 } else { 142 result = 0; 143 } 144 return result; 145} 146 147NCURSES_EXPORT(bool) 148_nc_is_dir_path(const char *path) 149{ 150 bool result = FALSE; 151 struct stat sb; 152 153 if (stat(path, &sb) == 0 154 && S_ISDIR(sb.st_mode)) { 155 result = TRUE; 156 } 157 return result; 158} 159 160NCURSES_EXPORT(bool) 161_nc_is_file_path(const char *path) 162{ 163 bool result = FALSE; 164 struct stat sb; 165 166 if (stat(path, &sb) == 0 167 && S_ISREG(sb.st_mode)) { 168 result = TRUE; 169 } 170 return result; 171} 172 173#ifndef USE_ROOT_ENVIRON 174/* 175 * Returns true if we allow application to use environment variables that are 176 * used for searching lists of directories, etc. 177 */ 178NCURSES_EXPORT(int) 179_nc_env_access(void) 180{ 181#if HAVE_ISSETUGID 182 if (issetugid()) 183 return FALSE; 184#elif HAVE_GETEUID && HAVE_GETEGID 185 if (getuid() != geteuid() 186 || getgid() != getegid()) 187 return FALSE; 188#endif 189 /* ...finally, disallow root */ 190 return (getuid() != ROOT_UID) && (geteuid() != ROOT_UID); 191} 192#endif 193