1/* 2 * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the OpenSSL license (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10/* 11 * This file is dual-licensed and is also available under the following 12 * terms: 13 * 14 * Copyright (c) 2004, 2018, Richard Levitte <richard@levitte.org> 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 28 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 29 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 30 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 31 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 32 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 33 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 34 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 35 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include <stddef.h> 40#include <stdlib.h> 41#include <limits.h> 42#include <string.h> 43#include <sys/types.h> 44#include <dirent.h> 45#include <errno.h> 46#ifndef LPDIR_H 47# include "LPdir.h" 48#endif 49#ifdef __VMS 50# include <ctype.h> 51#endif 52 53/* 54 * The POSIX macro for the maximum number of characters in a file path is 55 * NAME_MAX. However, some operating systems use PATH_MAX instead. 56 * Therefore, it seems natural to first check for PATH_MAX and use that, and 57 * if it doesn't exist, use NAME_MAX. 58 */ 59#if defined(PATH_MAX) 60# define LP_ENTRY_SIZE PATH_MAX 61#elif defined(NAME_MAX) 62# define LP_ENTRY_SIZE NAME_MAX 63#endif 64 65/* 66 * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX 67 * exist. It's also possible that NAME_MAX exists but is define to a very 68 * small value (HP-UX offers 14), so we need to check if we got a result, and 69 * if it meets a minimum standard, and create or change it if not. 70 */ 71#if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255 72# undef LP_ENTRY_SIZE 73# define LP_ENTRY_SIZE 255 74#endif 75 76struct LP_dir_context_st { 77 DIR *dir; 78 char entry_name[LP_ENTRY_SIZE + 1]; 79#ifdef __VMS 80 int expect_file_generations; 81 char previous_entry_name[LP_ENTRY_SIZE + 1]; 82#endif 83}; 84 85const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory) 86{ 87 struct dirent *direntry = NULL; 88 89 if (ctx == NULL || directory == NULL) { 90 errno = EINVAL; 91 return 0; 92 } 93 94 errno = 0; 95 if (*ctx == NULL) { 96 *ctx = malloc(sizeof(**ctx)); 97 if (*ctx == NULL) { 98 errno = ENOMEM; 99 return 0; 100 } 101 memset(*ctx, 0, sizeof(**ctx)); 102 103#ifdef __VMS 104 { 105 char c = directory[strlen(directory) - 1]; 106 107 if (c == ']' || c == '>' || c == ':') 108 (*ctx)->expect_file_generations = 1; 109 } 110#endif 111 112 (*ctx)->dir = opendir(directory); 113 if ((*ctx)->dir == NULL) { 114 int save_errno = errno; /* Probably not needed, but I'm paranoid */ 115 free(*ctx); 116 *ctx = NULL; 117 errno = save_errno; 118 return 0; 119 } 120 } 121 122#ifdef __VMS 123 strncpy((*ctx)->previous_entry_name, (*ctx)->entry_name, 124 sizeof((*ctx)->previous_entry_name)); 125 126 again: 127#endif 128 129 direntry = readdir((*ctx)->dir); 130 if (direntry == NULL) { 131 return 0; 132 } 133 134 OPENSSL_strlcpy((*ctx)->entry_name, direntry->d_name, 135 sizeof((*ctx)->entry_name)); 136#ifdef __VMS 137 if ((*ctx)->expect_file_generations) { 138 char *p = (*ctx)->entry_name + strlen((*ctx)->entry_name); 139 140 while(p > (*ctx)->entry_name && isdigit(p[-1])) 141 p--; 142 if (p > (*ctx)->entry_name && p[-1] == ';') 143 p[-1] = '\0'; 144 if (strcasecmp((*ctx)->entry_name, (*ctx)->previous_entry_name) == 0) 145 goto again; 146 } 147#endif 148 return (*ctx)->entry_name; 149} 150 151int LP_find_file_end(LP_DIR_CTX **ctx) 152{ 153 if (ctx != NULL && *ctx != NULL) { 154 int ret = closedir((*ctx)->dir); 155 156 free(*ctx); 157 switch (ret) { 158 case 0: 159 return 1; 160 case -1: 161 return 0; 162 default: 163 break; 164 } 165 } 166 errno = EINVAL; 167 return 0; 168} 169