crypto/LPdir_unix.c

   1 /*
   2  * Copyright 2004-2016 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  * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
  12  * All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  27  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  28  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  29  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  33  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include <stddef.h>
  37 #include <stdlib.h>
  38 #include <limits.h>
  39 #include <string.h>
  40 #include <sys/types.h>
  41 #include <dirent.h>
  42 #include <errno.h>
  43 #ifndef LPDIR_H
  44 # include "LPdir.h"
  45 #endif
  46
  47 /*
  48  * The POSIXly macro for the maximum number of characters in a file path is
  49  * NAME_MAX.  However, some operating systems use PATH_MAX instead.
  50  * Therefore, it seems natural to first check for PATH_MAX and use that, and
  51  * if it doesn't exist, use NAME_MAX.
  52  */
  53 #if defined(PATH_MAX)
  54 # define LP_ENTRY_SIZE PATH_MAX
  55 #elif defined(NAME_MAX)
  56 # define LP_ENTRY_SIZE NAME_MAX
  57 #endif
  58
  59 /*
  60  * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
  61  * exist.  It's also possible that NAME_MAX exists but is define to a very
  62  * small value (HP-UX offers 14), so we need to check if we got a result, and
  63  * if it meets a minimum standard, and create or change it if not.
  64  */
  65 #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
  66 # undef LP_ENTRY_SIZE
  67 # define LP_ENTRY_SIZE 255
  68 #endif
  69
  70 struct LP_dir_context_st {
  71     DIR *dir;
  72     char entry_name[LP_ENTRY_SIZE + 1];
  73 };
  74
  75 const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
  76 {
  77     struct dirent *direntry = NULL;
  78
  79     if (ctx == NULL || directory == NULL) {
  80         errno = EINVAL;
  81         return 0;
  82     }
  83
  84     errno = 0;
  85     if (*ctx == NULL) {
  86         *ctx = malloc(sizeof(**ctx));
  87         if (*ctx == NULL) {
  88             errno = ENOMEM;
  89             return 0;
  90         }
  91         memset(*ctx, 0, sizeof(**ctx));
  92
  93         (*ctx)->dir = opendir(directory);
  94         if ((*ctx)->dir == NULL) {
  95             int save_errno = errno; /* Probably not needed, but I'm paranoid */
  96             free(*ctx);
  97             *ctx = NULL;
  98             errno = save_errno;
  99             return 0;
 100         }
 101     }
 102
 103     direntry = readdir((*ctx)->dir);
 104     if (direntry == NULL) {
 105         return 0;
 106     }
 107
 108     strncpy((*ctx)->entry_name, direntry->d_name,
 109             sizeof((*ctx)->entry_name) - 1);
 110     (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
 111     return (*ctx)->entry_name;
 112 }
 113
 114 int LP_find_file_end(LP_DIR_CTX **ctx)
 115 {
 116     if (ctx != NULL && *ctx != NULL) {
 117         int ret = closedir((*ctx)->dir);
 118
 119         free(*ctx);
 120         switch (ret) {
 121         case 0:
 122             return 1;
 123         case -1:
 124             return 0;
 125         default:
 126             break;
 127         }
 128     }
 129     errno = EINVAL;
 130     return 0;
 131 }