1 | /*
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2 | * Copyright 2004-2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | /*
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11 | * Copyright (c) 2004, Richard Levitte <richard@levitte.org>
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12 | * All rights reserved.
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13 | *
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14 | * Redistribution and use in source and binary forms, with or without
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15 | * modification, are permitted provided that the following conditions
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16 | * are met:
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17 | * 1. Redistributions of source code must retain the above copyright
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18 | * notice, this list of conditions and the following disclaimer.
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19 | * 2. Redistributions in binary form must reproduce the above copyright
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20 | * notice, this list of conditions and the following disclaimer in the
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21 | * documentation and/or other materials provided with the distribution.
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22 | *
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23 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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24 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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25 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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26 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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27 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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28 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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29 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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30 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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31 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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32 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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33 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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34 | */
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35 |
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36 | #include <stddef.h>
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37 | #include <stdlib.h>
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38 | #include <limits.h>
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39 | #include <string.h>
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40 | #include <sys/types.h>
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41 | #include <dirent.h>
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42 | #include <errno.h>
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43 | #ifndef LPDIR_H
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44 | # include "LPdir.h"
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45 | #endif
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46 |
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47 | /*
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48 | * The POSIXly macro for the maximum number of characters in a file path is
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49 | * NAME_MAX. However, some operating systems use PATH_MAX instead.
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50 | * Therefore, it seems natural to first check for PATH_MAX and use that, and
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51 | * if it doesn't exist, use NAME_MAX.
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52 | */
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53 | #if defined(PATH_MAX)
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54 | # define LP_ENTRY_SIZE PATH_MAX
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55 | #elif defined(NAME_MAX)
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56 | # define LP_ENTRY_SIZE NAME_MAX
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57 | #endif
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58 |
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59 | /*
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60 | * Of course, there's the possibility that neither PATH_MAX nor NAME_MAX
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61 | * exist. It's also possible that NAME_MAX exists but is define to a very
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62 | * small value (HP-UX offers 14), so we need to check if we got a result, and
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63 | * if it meets a minimum standard, and create or change it if not.
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64 | */
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65 | #if !defined(LP_ENTRY_SIZE) || LP_ENTRY_SIZE<255
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66 | # undef LP_ENTRY_SIZE
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67 | # define LP_ENTRY_SIZE 255
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68 | #endif
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69 |
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70 | struct LP_dir_context_st {
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71 | DIR *dir;
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72 | char entry_name[LP_ENTRY_SIZE + 1];
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73 | };
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74 |
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75 | const char *LP_find_file(LP_DIR_CTX **ctx, const char *directory)
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76 | {
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77 | struct dirent *direntry = NULL;
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78 |
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79 | if (ctx == NULL || directory == NULL) {
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80 | errno = EINVAL;
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81 | return 0;
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82 | }
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83 |
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84 | errno = 0;
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85 | if (*ctx == NULL) {
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86 | *ctx = malloc(sizeof(**ctx));
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87 | if (*ctx == NULL) {
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88 | errno = ENOMEM;
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89 | return 0;
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90 | }
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91 | memset(*ctx, 0, sizeof(**ctx));
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92 |
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93 | (*ctx)->dir = opendir(directory);
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94 | if ((*ctx)->dir == NULL) {
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95 | int save_errno = errno; /* Probably not needed, but I'm paranoid */
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96 | free(*ctx);
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97 | *ctx = NULL;
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98 | errno = save_errno;
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99 | return 0;
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100 | }
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101 | }
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102 |
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103 | direntry = readdir((*ctx)->dir);
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104 | if (direntry == NULL) {
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105 | return 0;
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106 | }
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107 |
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108 | strncpy((*ctx)->entry_name, direntry->d_name,
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109 | sizeof((*ctx)->entry_name) - 1);
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110 | (*ctx)->entry_name[sizeof((*ctx)->entry_name) - 1] = '\0';
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111 | return (*ctx)->entry_name;
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112 | }
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113 |
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114 | int LP_find_file_end(LP_DIR_CTX **ctx)
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115 | {
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116 | if (ctx != NULL && *ctx != NULL) {
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117 | int ret = closedir((*ctx)->dir);
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118 |
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119 | free(*ctx);
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120 | switch (ret) {
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121 | case 0:
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122 | return 1;
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123 | case -1:
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124 | return 0;
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125 | default:
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126 | break;
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127 | }
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128 | }
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129 | errno = EINVAL;
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130 | return 0;
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131 | }
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