crypto/LPdir_unix.c

   1 /*
   2  * Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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
  76 struct 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
  85 const 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     strncpy((*ctx)->entry_name, direntry->d_name,
 135             sizeof((*ctx)->entry_name) - 1);
 136     (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
 137 #ifdef __VMS
 138     if ((*ctx)->expect_file_generations) {
 139         char *p = (*ctx)->entry_name + strlen((*ctx)->entry_name);
 140
 141         while(p > (*ctx)->entry_name && isdigit(p[-1]))
 142             p--;
 143         if (p > (*ctx)->entry_name && p[-1] == ';')
 144             p[-1] = '\0';
 145         if (strcasecmp((*ctx)->entry_name, (*ctx)->previous_entry_name) == 0)
 146             goto again;
 147     }
 148 #endif
 149     return (*ctx)->entry_name;
 150 }
 151
 152 int LP_find_file_end(LP_DIR_CTX **ctx)
 153 {
 154     if (ctx != NULL && *ctx != NULL) {
 155         int ret = closedir((*ctx)->dir);
 156
 157         free(*ctx);
 158         switch (ret) {
 159         case 0:
 160             return 1;
 161         case -1:
 162             return 0;
 163         default:
 164             break;
 165         }
 166     }
 167     errno = EINVAL;
 168     return 0;
 169 }