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| Rev | Author | Line No. | Line |
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| 3 | daniel-mar | 1 | <?php |
| 2 | |||
| 3 | /* |
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| 4 | * OID-Utilities for PHP |
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| 86 | daniel-mar | 5 | * Copyright 2011 - 2023 Daniel Marschall, ViaThinkSoft |
| 6 | * Version 2023-08-25 |
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| 3 | daniel-mar | 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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| 9 | * you may not use this file except in compliance with the License. |
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| 10 | * You may obtain a copy of the License at |
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| 11 | * |
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| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 13 | * |
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| 14 | * Unless required by applicable law or agreed to in writing, software |
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| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 17 | * See the License for the specific language governing permissions and |
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| 18 | * limitations under the License. |
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| 19 | */ |
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| 20 | |||
| 21 | // All functions in this library are compatible with leading zeroes (not recommended) and leading dots |
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| 22 | |||
| 23 | // TODO: change some function names, so that they have a uniform naming schema, and rename "oid identifier" into "ASN.1 alphanumeric identifier" |
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| 24 | // oid_id_is_valid() => asn1_alpha_id_valid() |
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| 25 | |||
| 26 | define('OID_DOT_FORBIDDEN', 0); |
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| 27 | define('OID_DOT_OPTIONAL', 1); |
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| 28 | define('OID_DOT_REQUIRED', 2); |
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| 29 | |||
| 30 | /** |
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| 31 | * Checks if an OID has a valid dot notation. |
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| 32 | * @author Daniel Marschall, ViaThinkSoft |
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| 33 | * @version 2014-12-09 |
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| 13 | daniel-mar | 34 | * @param string $oid<br/> |
| 3 | daniel-mar | 35 | * An OID in dot notation. |
| 13 | daniel-mar | 36 | * @param boolean $allow_leading_zeroes<br/> |
| 3 | daniel-mar | 37 | * true of leading zeroes are allowed or not. |
| 13 | daniel-mar | 38 | * @param boolean $allow_leading_dot<br/> |
| 3 | daniel-mar | 39 | * true of leading dots are allowed or not. |
| 40 | * @return boolean true if the dot notation is valid. |
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| 41 | **/ |
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| 42 | function oid_valid_dotnotation($oid, $allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { |
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| 43 | $regex = oid_validation_regex($allow_leading_zeroes, $allow_leading_dot, $min_len); |
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| 44 | |||
| 45 | $m = array(); |
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| 46 | return preg_match($regex, $oid, $m) ? true : false; |
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| 47 | } |
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| 48 | |||
| 49 | /** |
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| 50 | * Returns a full regular expression to validate an OID in dot-notation |
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| 51 | * @author Daniel Marschall, ViaThinkSoft |
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| 52 | * @version 2014-12-09 |
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| 13 | daniel-mar | 53 | * @param boolean $allow_leading_zeroes<br/> |
| 3 | daniel-mar | 54 | * true of leading zeroes are allowed or not. |
| 13 | daniel-mar | 55 | * @param boolean $allow_leading_dot<br/> |
| 3 | daniel-mar | 56 | * true of leading dots are allowed or not. |
| 57 | * @return string The regular expression |
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| 58 | **/ |
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| 59 | function oid_validation_regex($allow_leading_zeroes=true, $allow_leading_dot=false, $min_len=0) { |
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| 60 | $leading_dot_policy = $allow_leading_dot ? OID_DOT_OPTIONAL : OID_DOT_FORBIDDEN; |
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| 61 | |||
| 62 | $part_regex = oid_part_regex($min_len, $allow_leading_zeroes, $leading_dot_policy); |
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| 63 | |||
| 64 | return '@^'.$part_regex.'$@'; |
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| 65 | } |
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| 66 | |||
| 67 | /** |
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| 68 | * Returns a partial regular expression which matches valid OIDs in dot notation. |
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| 69 | * It can be inserted into regular expressions. |
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| 70 | * @author Daniel Marschall, ViaThinkSoft |
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| 71 | * @version 2014-12-09 |
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| 13 | daniel-mar | 72 | * @param int $min_len<br/> |
| 73 | * 0="." and greater will be recognized, but not ""<br/> |
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| 74 | * 1=".2" and greater will be recognized<br/> |
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| 75 | * 2=".2.999" and greater will be recognized (default)<br/> |
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| 3 | daniel-mar | 76 | * etc. |
| 13 | daniel-mar | 77 | * @param boolean $allow_leading_zeroes<br/> |
| 78 | * true: ".2.0999" will be recognized<br/> |
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| 3 | daniel-mar | 79 | * false: ".2.0999" won't be recognized (default) |
| 13 | daniel-mar | 80 | * @param int $leading_dot_policy<br/> |
| 81 | * 0 (OID_DOT_FORBIDDEN): forbidden<br/> |
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| 82 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br/> |
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| 3 | daniel-mar | 83 | * 2 (OID_DOT_REQUIRED) : enforced |
| 84 | * @return string|false A regular expression which matches OIDs in dot notation |
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| 85 | **/ |
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| 86 | function oid_part_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL) { |
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| 87 | switch ($leading_dot_policy) { |
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| 88 | case 0: // forbidden |
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| 89 | $lead_dot = ''; |
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| 90 | break; |
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| 91 | case 1: // optional |
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| 92 | $lead_dot = '\\.{0,1}'; |
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| 93 | break; |
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| 94 | case 2: // enforced |
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| 95 | $lead_dot = '\\.'; |
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| 96 | break; |
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| 97 | default: |
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| 98 | assert(false); |
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| 99 | return false; |
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| 100 | } |
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| 101 | |||
| 102 | $lead_zero = $allow_leading_zeroes ? '0*' : ''; |
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| 103 | $zero_till_thirtynine = '(([0-9])|([1-3][0-9]))'; // second arc is limited to 0..39 if root arc is 0..1 |
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| 104 | $singledot_option = ($min_len == 0) && ($leading_dot_policy != OID_DOT_FORBIDDEN) ? '|\\.' : ''; |
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| 105 | $only_root_option = ($min_len <= 1) ? '|('.$lead_dot.$lead_zero.'[0-2])' : ''; |
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| 106 | |||
| 107 | $regex = ' |
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| 108 | ( |
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| 109 | ( |
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| 110 | ( |
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| 111 | ('.$lead_dot.$lead_zero.'[0-1]) |
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| 112 | \\.'.$lead_zero.$zero_till_thirtynine.' |
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| 113 | (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-2).',} |
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| 114 | )|( |
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| 115 | ('.$lead_dot.$lead_zero.'[2]) |
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| 116 | (\\.'.$lead_zero.'(0|[1-9][0-9]*)){'.max(0, $min_len-1).',} |
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| 117 | ) |
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| 118 | '.$only_root_option.' |
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| 119 | '.$singledot_option.' |
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| 120 | ) |
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| 121 | )'; |
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| 122 | |||
| 123 | // Remove the indentations which are used to maintain this large regular expression in a human friendly way |
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| 124 | $regex = str_replace("\n", '', $regex); |
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| 125 | $regex = str_replace("\r", '', $regex); |
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| 126 | $regex = str_replace("\t", '', $regex); |
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| 127 | $regex = str_replace(' ', '', $regex); |
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| 128 | |||
| 129 | return $regex; |
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| 130 | } |
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| 131 | |||
| 132 | /** |
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| 133 | * Searches all OIDs in $text and outputs them as array. |
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| 134 | * @author Daniel Marschall, ViaThinkSoft |
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| 135 | * @version 2014-12-09 |
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| 13 | daniel-mar | 136 | * @param string $text<br/> |
| 3 | daniel-mar | 137 | * The text to be parsed |
| 13 | daniel-mar | 138 | * @param int $min_len<br/> |
| 139 | * 0="." and greater will be recognized, but not ""<br/> |
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| 140 | * 1=".2" and greater will be recognized<br/> |
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| 141 | * 2=".2.999" and greater will be recognized (default)<br/> |
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| 3 | daniel-mar | 142 | * etc. |
| 13 | daniel-mar | 143 | * @param boolean $allow_leading_zeroes<br/> |
| 144 | * true: ".2.0999" will be recognized<br/> |
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| 3 | daniel-mar | 145 | * false: ".2.0999" won't be recognized (default) |
| 13 | daniel-mar | 146 | * @param int $leading_dot_policy<br/> |
| 147 | * 0 (OID_DOT_FORBIDDEN): forbidden<br/> |
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| 148 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br/> |
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| 3 | daniel-mar | 149 | * 2 (OID_DOT_REQUIRED) : enforced |
| 13 | daniel-mar | 150 | * @param boolean $requires_whitespace_delimiters<br/> |
| 151 | * true: "2.999" will be recognized, as well as " 2.999 " (default)<br/> |
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| 3 | daniel-mar | 152 | * false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) |
| 153 | * @return string[] An array of OIDs in dot notation |
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| 154 | **/ |
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| 155 | function parse_oids($text, $min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { |
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| 156 | $regex = oid_detection_regex($min_len, $allow_leading_zeroes, $leading_dot_policy, $requires_whitespace_delimiters); |
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| 157 | |||
| 158 | $matches = array(); |
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| 159 | preg_match_all($regex, $text, $matches); |
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| 160 | return $matches[1]; |
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| 161 | } |
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| 162 | |||
| 163 | /** |
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| 164 | * Returns a full regular expression for detecting OIDs in dot notation inside a text. |
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| 165 | * @author Daniel Marschall, ViaThinkSoft |
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| 166 | * @version 2014-12-09 |
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| 13 | daniel-mar | 167 | * @param int $min_len<br/> |
| 168 | * 0="." and greater will be recognized, but not ""<br/> |
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| 169 | * 1=".2" and greater will be recognized<br/> |
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| 170 | * 2=".2.999" and greater will be recognized (default)<br/> |
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| 3 | daniel-mar | 171 | * etc. |
| 13 | daniel-mar | 172 | * @param boolean $allow_leading_zeroes<br/> |
| 173 | * true: ".2.0999" will be recognized<br/> |
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| 3 | daniel-mar | 174 | * false: ".2.0999" won't be recognized (default) |
| 13 | daniel-mar | 175 | * @param int $leading_dot_policy<br/> |
| 176 | * 0 (OID_DOT_FORBIDDEN): forbidden<br/> |
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| 177 | * 1 (OID_DOT_OPTIONAL) : optional (default)<br/> |
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| 3 | daniel-mar | 178 | * 2 (OID_DOT_REQUIRED) : enforced |
| 13 | daniel-mar | 179 | * @param boolean $requires_whitespace_delimiters<br/> |
| 180 | * true: "2.999" will be recognized, as well as " 2.999 " (default)<br/> |
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| 3 | daniel-mar | 181 | * false: "2.999!" will be reconigzed, as well as "2.999.c" (this might be used in in documentations with templates) |
| 182 | * @return string The regular expression |
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| 183 | **/ |
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| 184 | function oid_detection_regex($min_len=2, $allow_leading_zeroes=false, $leading_dot_policy=OID_DOT_OPTIONAL, $requires_whitespace_delimiters=true) { |
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| 185 | if ($requires_whitespace_delimiters) { |
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| 186 | // A fully qualified regular expression which can be used by preg_match() |
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| 187 | $begin_condition = '(?<=^|\\s)'; |
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| 188 | $end_condition = '(?=\\s|$)'; |
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| 189 | } else { |
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| 190 | // A partial expression which can be used inside another regular expression |
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| 191 | $begin_condition = '(?<![\d])'; |
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| 192 | $end_condition = '(?![\d])'; |
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| 193 | } |
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| 194 | |||
| 195 | $part_regex = oid_part_regex($min_len, $allow_leading_zeroes, $leading_dot_policy); |
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| 196 | |||
| 197 | return '@'.$begin_condition.$part_regex.$end_condition.'@'; |
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| 198 | } |
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| 199 | |||
| 200 | /** |
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| 13 | daniel-mar | 201 | * Returns the parent of an OID in dot notation or the OID itself, if it is the root.<br/> |
| 3 | daniel-mar | 202 | * Leading dots and leading zeroes are tolerated. |
| 203 | * @author Daniel Marschall, ViaThinkSoft |
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| 204 | * @version 2014-12-16 |
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| 13 | daniel-mar | 205 | * @param string $oid<br/> |
| 3 | daniel-mar | 206 | * An OID in dot notation. |
| 207 | * @return string|false The parent OID in dot notation. |
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| 208 | **/ |
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| 209 | function oid_up($oid) { |
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| 210 | $oid = sanitizeOID($oid, 'auto'); |
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| 211 | if ($oid === false) return false; |
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| 212 | |||
| 213 | $p = strrpos($oid, '.'); |
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| 214 | if ($p === false) return $oid; |
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| 215 | if ($p == 0) return '.'; |
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| 216 | |||
| 217 | return substr($oid, 0, $p); |
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| 218 | } |
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| 219 | |||
| 220 | /** |
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| 221 | * Outputs the depth of an OID. |
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| 222 | * @author Daniel Marschall, ViaThinkSoft |
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| 223 | * @version 2014-12-09 |
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| 224 | * @param string $oid An OID in dot notation (with or without leading dot) |
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| 225 | * @return int The depth of the OID, e.g. 2.999 and .2.999 has the length 2. |
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| 226 | **/ |
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| 227 | function oid_len($oid) { |
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| 228 | if ($oid == '') return 0; |
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| 86 | daniel-mar | 229 | if (substr($oid,0,1) == '.') $oid = substr($oid, 1); |
| 3 | daniel-mar | 230 | return substr_count($oid, '.')+1; |
| 231 | } |
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| 232 | function oid_depth($oid) { |
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| 233 | return oid_len($oid); |
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| 234 | } |
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| 235 | |||
| 236 | /** |
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| 237 | * Lists all parents of an OID. |
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| 238 | * This function tolerates leading dots. The parent of '.' stays '.'. |
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| 239 | * The OID will not be checked for validity! |
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| 240 | * @author Daniel Marschall, ViaThinkSoft |
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| 241 | * @version 2014-12-17 |
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| 13 | daniel-mar | 242 | * @param string $oid<br/> |
| 3 | daniel-mar | 243 | * An OID in dot notation. |
| 244 | * @return string[] An array with all parent OIDs. |
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| 245 | **/ |
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| 246 | function oid_parents($oid) { |
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| 247 | $parents = array(); |
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| 248 | |||
| 249 | while (oid_len($oid) > 1) { |
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| 250 | $oid = oid_up($oid); |
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| 251 | $parents[] = $oid; |
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| 252 | } |
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| 253 | |||
| 254 | if (substr($oid, 0, 1) == '.') $parents[] = '.'; |
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| 255 | |||
| 256 | return $parents; |
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| 257 | } |
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| 258 | |||
| 259 | /* |
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| 260 | assert(oid_parents('.1.2.999') == array('.1.2', '.1', '.')); |
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| 261 | assert(oid_parents('1.2.999') == array('1.2', '1')); |
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| 262 | assert(oid_parents('.') == array('.')); |
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| 263 | assert(oid_parents('') == array()); |
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| 264 | */ |
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| 265 | |||
| 266 | /** |
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| 267 | * Sorts an array containing OIDs in dot notation. |
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| 268 | * @author Daniel Marschall, ViaThinkSoft |
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| 269 | * @version 2014-12-09 |
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| 13 | daniel-mar | 270 | * @param string[] $ary<br/> |
| 271 | * An array of OIDs in dot notation.<br/> |
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| 3 | daniel-mar | 272 | * This array will be changed by this method. |
| 13 | daniel-mar | 273 | * @param boolean $output_with_leading_dot<br/> |
| 3 | daniel-mar | 274 | * true: The array will be normalized to OIDs with a leading dot. |
| 275 | * false: The array will be normalized to OIDs without a leading dot. (default) |
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| 276 | **/ |
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| 277 | function oidSort(&$ary, $output_with_leading_dot=false) { |
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| 278 | $out = array(); |
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| 279 | |||
| 280 | $none = $output_with_leading_dot ? '.' : ''; |
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| 281 | |||
| 282 | $d = array(); |
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| 283 | $oid = null; |
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| 284 | foreach ($ary as &$oid) { |
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| 285 | if (($oid == '') || ($oid == '.')) { |
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| 286 | $out[] = $none; |
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| 287 | } else { |
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| 288 | $oid = sanitizeOID($oid, 'auto'); // strike leading zeroes |
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| 289 | $bry = explode('.', $oid, 2); |
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| 290 | $firstarc = $bry[0]; |
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| 291 | $rest = (isset($bry[1])) ? $bry[1] : ''; |
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| 292 | $d[$firstarc][] = $rest; |
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| 293 | } |
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| 294 | } |
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| 295 | unset($oid); |
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| 296 | ksort($d); |
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| 297 | |||
| 298 | $data = null; |
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| 299 | foreach ($d as $firstarc => &$data) { |
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| 300 | oidSort($data); |
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| 301 | foreach ($data as &$rest) { |
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| 302 | $out[] = ($output_with_leading_dot ? '.' : '')."$firstarc" . (($rest != $none) ? ".$rest" : ''); |
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| 303 | } |
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| 304 | } |
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| 305 | unset($data); |
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| 306 | |||
| 307 | $ary = $out; |
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| 308 | } |
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| 309 | |||
| 310 | /** |
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| 311 | * Checks if two OIDs in dot-notation are equal |
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| 312 | * @author Daniel Marschall, ViaThinkSoft |
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| 313 | * @version 2020-05-27 |
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| 13 | daniel-mar | 314 | * @param string $oidA<br/> |
| 3 | daniel-mar | 315 | * First OID |
| 13 | daniel-mar | 316 | * @param string $oidB<br/> |
| 3 | daniel-mar | 317 | * Second OID |
| 318 | * @return boolean|null True if the OIDs are equal, null if one of the OIDs are invalid |
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| 319 | **/ |
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| 320 | function oid_dotnotation_equal($oidA, $oidB) { |
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| 321 | $oidA = sanitizeOID($oidA, false); |
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| 322 | if ($oidA === false) return null; |
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| 323 | |||
| 324 | $oidB = sanitizeOID($oidB, false); |
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| 325 | if ($oidB === false) return null; |
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| 326 | |||
| 327 | return $oidA === $oidB; |
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| 328 | } |
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| 329 | |||
| 330 | /** |
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| 331 | * Removes leading zeroes from an OID in dot notation. |
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| 332 | * @author Daniel Marschall, ViaThinkSoft |
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| 333 | * @version 2015-08-17 |
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| 13 | daniel-mar | 334 | * @param string $oid<br/> |
| 3 | daniel-mar | 335 | * An OID in dot notation. |
| 24 | daniel-mar | 336 | * @param mixed $leading_dot<br/> |
| 13 | daniel-mar | 337 | * true: The OID is valid, if it contains a leading dot.<br/> |
| 3 | daniel-mar | 338 | * false (default): The OID is valid, if it does not contain a leading dot. |
| 339 | * 'auto: Allow both |
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| 340 | * @return string|false The OID without leading dots, or <code>false</code> if the OID is syntactically wrong. |
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| 341 | **/ |
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| 342 | function sanitizeOID($oid, $leading_dot=false) { |
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| 24 | daniel-mar | 343 | static $oid_sanitize_cache = array(); |
| 344 | |||
| 3 | daniel-mar | 345 | if ($leading_dot) $leading_dot = substr($oid,0,1) == '.'; |
| 346 | |||
| 347 | // We are using a cache, since this function is used very often by OIDplus |
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| 348 | global $oid_sanitize_cache; |
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| 349 | $v = ($leading_dot ? 'T' : 'F').$oid; |
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| 350 | if (isset($oid_sanitize_cache[$v])) return $oid_sanitize_cache[$v]; |
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| 351 | |||
| 352 | if ($leading_dot) { |
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| 353 | if ($oid == '.') return ''; |
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| 354 | } else { |
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| 355 | if ($oid == '') return ''; |
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| 356 | } |
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| 357 | |||
| 358 | $out = ''; |
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| 359 | $ary = explode('.', $oid); |
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| 360 | foreach ($ary as $n => &$a) { |
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| 361 | if (($leading_dot) && ($n == 0)) { |
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| 362 | if ($a != '') return false; |
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| 363 | continue; |
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| 364 | } |
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| 365 | |||
| 23 | daniel-mar | 366 | if (!preg_match('@^(\\d+)$@', $a, $m)) return false; // does contain something other than digits |
| 3 | daniel-mar | 367 | |
| 368 | // strike leading zeroes |
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| 369 | $a = preg_replace("@^0+@", '', $a); |
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| 370 | if ($a == '') $a = 0; |
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| 371 | |||
| 372 | if (($leading_dot) || ($n != 0)) $out .= '.'; |
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| 373 | $out .= $a; |
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| 374 | } |
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| 375 | unset($a); |
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| 376 | unset($ary); |
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| 377 | |||
| 378 | $oid_sanitize_cache[$v] = $out; |
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| 379 | return $out; |
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| 380 | } |
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| 381 | |||
| 382 | /** |
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| 383 | * Shows the top arc of an OID. |
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| 384 | * This function tolerates leading dots. |
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| 385 | * @author Daniel Marschall, ViaThinkSoft |
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| 386 | * @version 2014-12-16 |
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| 13 | daniel-mar | 387 | * @param string $oid<br/> |
| 3 | daniel-mar | 388 | * An OID in dot notation. |
| 389 | * @return string|false The top arc of the OID or empty string if it is already the root ('.') |
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| 390 | **/ |
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| 391 | function oid_toparc($oid) { |
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| 392 | $leadingdot = substr($oid,0,1) == '.'; |
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| 393 | |||
| 394 | $oid = sanitizeOID($oid, $leadingdot); |
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| 395 | if ($oid === false) return false; |
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| 396 | |||
| 397 | if (!$leadingdot) $oid = '.'.$oid; |
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| 398 | |||
| 399 | $p = strrpos($oid, '.'); |
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| 400 | if ($p === false) return false; |
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| 401 | $r = substr($oid, $p+1); |
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| 402 | |||
| 403 | if ($leadingdot) { |
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| 404 | # if ($r == '') return '.'; |
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| 405 | return $r; |
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| 406 | } else { |
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| 407 | return substr($r, 1); |
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| 408 | } |
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| 409 | } |
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| 410 | |||
| 411 | /** |
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| 412 | * Calculates the distance between two OIDs. |
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| 413 | * This function tolerates leading dots and leading zeroes. |
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| 414 | * @author Daniel Marschall, ViaThinkSoft |
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| 415 | * @version 2014-12-20 |
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| 13 | daniel-mar | 416 | * @param string $a<br/> |
| 3 | daniel-mar | 417 | * An OID. |
| 13 | daniel-mar | 418 | * @param string $b<br/> |
| 3 | daniel-mar | 419 | * An OID. |
| 13 | daniel-mar | 420 | * @return int|false false if both OIDs do not have a child-parent or parent-child relation, e.g. oid_distance('2.999.1.2.3', '2.999.4.5') = false, or if one of the OIDs is syntactially invalid<br/> |
| 421 | * >0 if $a is more specific than $b , e.g. oid_distance('2.999.1.2', '2.999') = 2<br/> |
||
| 3 | daniel-mar | 422 | * <0 if $a is more common than $b , e.g. oid_distance('2.999', '2.999.1.2') = -2 |
| 423 | **/ |
||
| 424 | function oid_distance($a, $b) { |
||
| 425 | if (substr($a,0,1) == '.') $a = substr($a,1); |
||
| 426 | if (substr($b,0,1) == '.') $b = substr($b,1); |
||
| 427 | |||
| 428 | $a = sanitizeOID($a, false); |
||
| 429 | if ($a === false) return false; |
||
| 430 | $b = sanitizeOID($b, false); |
||
| 431 | if ($b === false) return false; |
||
| 432 | |||
| 433 | $ary = explode('.', $a); |
||
| 434 | $bry = explode('.', $b); |
||
| 435 | |||
| 436 | $min_len = min(count($ary), count($bry)); |
||
| 437 | |||
| 438 | for ($i=0; $i<$min_len; $i++) { |
||
| 439 | if ($ary[$i] != $bry[$i]) return false; |
||
| 440 | } |
||
| 441 | |||
| 442 | return count($ary) - count($bry); |
||
| 443 | } |
||
| 444 | /* |
||
| 445 | assert(oid_distance('2.999.1.2.3', '2.999.4.5') === false); |
||
| 446 | assert(oid_distance('2.999.1.2', '2.999') === 2); |
||
| 447 | assert(oid_distance('2.999', '2.999.1.2') === -2); |
||
| 448 | */ |
||
| 449 | |||
| 450 | /** |
||
| 451 | * Adds a leading dot to an OID. |
||
| 452 | * Leading zeroes are tolerated. |
||
| 453 | * @author Daniel Marschall, ViaThinkSoft |
||
| 454 | * @version 2014-12-20 |
||
| 13 | daniel-mar | 455 | * @param string $oid<br/> |
| 3 | daniel-mar | 456 | * An OID. |
| 457 | * @return string|false The OID with a leading dot or false if the OID is syntactially wrong. |
||
| 458 | **/ |
||
| 459 | function oid_add_leading_dot($oid) { |
||
| 460 | $oid = sanitizeOID($oid, 'auto'); |
||
| 461 | if ($oid === false) return false; |
||
| 462 | |||
| 86 | daniel-mar | 463 | if (substr($oid,0,1) != '.') $oid = '.'.$oid; |
| 3 | daniel-mar | 464 | return $oid; |
| 465 | } |
||
| 466 | |||
| 467 | /** |
||
| 468 | * Removes a leading dot to an OID. |
||
| 469 | * Leading zeroes are tolerated. |
||
| 470 | * @author Daniel Marschall, ViaThinkSoft |
||
| 471 | * @version 2014-12-20 |
||
| 13 | daniel-mar | 472 | * @param string $oid<br/> |
| 3 | daniel-mar | 473 | * An OID. |
| 474 | * @return string|false The OID without a leading dot or false if the OID is syntactially wrong. |
||
| 475 | **/ |
||
| 476 | function oid_remove_leading_dot($oid) { |
||
| 477 | $oid = sanitizeOID($oid, 'auto'); |
||
| 478 | if ($oid === false) return false; |
||
| 479 | |||
| 480 | if (substr($oid,0,1) == '.') $oid = substr($oid, 1); |
||
| 481 | return $oid; |
||
| 482 | } |
||
| 483 | |||
| 484 | /** |
||
| 485 | * Find the common ancestor of two or more OIDs |
||
| 486 | * @author Daniel Marschall, ViaThinkSoft |
||
| 487 | * @version 2020-05-27 |
||
| 13 | daniel-mar | 488 | * @param string[] $oids<br/> |
| 3 | daniel-mar | 489 | * An array of multiple OIDs, e.g. 2.999.1 and 2.999.2.3.4 |
| 490 | * @return string|false The common ancestor, e.g. 2.999, or false if there is no common ancestor. |
||
| 491 | **/ |
||
| 492 | function oid_common_ancestor(array $oids) { |
||
| 493 | $shared = array(); |
||
| 494 | |||
| 495 | if (!is_array($oids)) return false; |
||
| 496 | if (count($oids) === 0) return false; |
||
| 497 | |||
| 498 | foreach ($oids as &$oid) { |
||
| 499 | $oid = sanitizeOID($oid, false); |
||
| 500 | if ($oid === false) return false; |
||
| 501 | $oid = explode('.', $oid); |
||
| 502 | } |
||
| 503 | |||
| 504 | $max_ok = strlen($oids[0]); |
||
| 505 | for ($i=1; $i<count($oids); $i++) { |
||
| 506 | for ($j=0; $j<min(strlen($oids[$i]),strlen($oids[0])); $j++) { |
||
| 507 | if ($oids[$i][$j] != $oids[0][$j]) { |
||
| 508 | if ($j < $max_ok) $max_ok = $j; |
||
| 509 | break; |
||
| 510 | } |
||
| 511 | } |
||
| 512 | if ($j < $max_ok) $max_ok = $j; |
||
| 513 | } |
||
| 514 | |||
| 515 | $out = array(); |
||
| 516 | for ($i=0; $i<$max_ok; $i++) { |
||
| 517 | $out[] = $oids[0][$i]; |
||
| 518 | } |
||
| 519 | return implode('.', $out); |
||
| 520 | } |
||
| 521 | /* |
||
| 522 | assert(oid_shared_ancestor(array('2.999.4.5.3', '2.999.4.5')) === "2.999.4.5"); |
||
| 523 | assert(oid_shared_ancestor(array('2.999.4.5', '2.999.4.5.3')) === "2.999.4.5"); |
||
| 524 | assert(oid_shared_ancestor(array('2.999.1.2.3', '2.999.4.5')) === "2.999"); |
||
| 525 | */ |
||
| 526 | |||
| 527 | |||
| 528 | # === OID-IRI NOTATION FUNCTIONS === |
||
| 529 | |||
| 530 | if (!function_exists('mb_ord')) { |
||
| 531 | # http://stackoverflow.com/a/24755772/3544341 |
||
| 532 | function mb_ord($char, $encoding = 'UTF-8') { |
||
| 533 | if ($encoding === 'UCS-4BE') { |
||
| 534 | list(, $ord) = (strlen($char) === 4) ? @unpack('N', $char) : @unpack('n', $char); |
||
| 535 | return $ord; |
||
| 536 | } else { |
||
| 537 | return mb_ord(mb_convert_encoding($char, 'UCS-4BE', $encoding), 'UCS-4BE'); |
||
| 538 | } |
||
| 539 | } |
||
| 540 | } |
||
| 541 | |||
| 542 | function iri_char_valid($c, $firstchar, $lastchar) { |
||
| 543 | // see Rec. ITU-T X.660, clause 7.5 |
||
| 544 | |||
| 545 | if (($firstchar || $lastchar) && ($c == '-')) return false; |
||
| 546 | |||
| 547 | if ($c == '-') return true; |
||
| 548 | if ($c == '.') return true; |
||
| 549 | if ($c == '_') return true; |
||
| 550 | if ($c == '~') return true; |
||
| 551 | if (($c >= '0') && ($c <= '9') && (!$firstchar)) return true; |
||
| 552 | if (($c >= 'A') && ($c <= 'Z')) return true; |
||
| 553 | if (($c >= 'a') && ($c <= 'z')) return true; |
||
| 554 | |||
| 555 | $v = mb_ord($c); |
||
| 556 | |||
| 557 | if (($v >= 0x000000A0) && ($v <= 0x0000DFFE)) return true; |
||
| 558 | if (($v >= 0x0000F900) && ($v <= 0x0000FDCF)) return true; |
||
| 559 | if (($v >= 0x0000FDF0) && ($v <= 0x0000FFEF)) return true; |
||
| 560 | if (($v >= 0x00010000) && ($v <= 0x0001FFFD)) return true; |
||
| 561 | if (($v >= 0x00020000) && ($v <= 0x0002FFFD)) return true; |
||
| 562 | if (($v >= 0x00030000) && ($v <= 0x0003FFFD)) return true; |
||
| 563 | if (($v >= 0x00040000) && ($v <= 0x0004FFFD)) return true; |
||
| 564 | if (($v >= 0x00050000) && ($v <= 0x0005FFFD)) return true; |
||
| 565 | if (($v >= 0x00060000) && ($v <= 0x0006FFFD)) return true; |
||
| 566 | if (($v >= 0x00070000) && ($v <= 0x0007FFFD)) return true; |
||
| 567 | if (($v >= 0x00080000) && ($v <= 0x0008FFFD)) return true; |
||
| 568 | if (($v >= 0x00090000) && ($v <= 0x0009FFFD)) return true; |
||
| 569 | if (($v >= 0x000A0000) && ($v <= 0x000AFFFD)) return true; |
||
| 570 | if (($v >= 0x000B0000) && ($v <= 0x000BFFFD)) return true; |
||
| 571 | if (($v >= 0x000C0000) && ($v <= 0x000CFFFD)) return true; |
||
| 572 | if (($v >= 0x000D0000) && ($v <= 0x000DFFFD)) return true; |
||
| 573 | if (($v >= 0x000E1000) && ($v <= 0x000EFFFD)) return true; |
||
| 574 | |||
| 575 | // Note: Rec. ITU-T X.660, clause 7.5.3 would also forbid ranges which are marked in ISO/IEC 10646 as "(This position shall not be used)" |
||
| 576 | // But tool implementers should be tolerate them, since these limitations can be removed in future. |
||
| 577 | |||
| 578 | return false; |
||
| 579 | } |
||
| 580 | |||
| 581 | function iri_arc_valid($arc, $allow_numeric=true) { |
||
| 582 | if ($arc == '') return false; |
||
| 583 | |||
| 584 | $m = array(); |
||
| 585 | if ($allow_numeric && preg_match('@^(\\d+)$@', $arc, $m)) return true; # numeric arc |
||
| 586 | |||
| 587 | // Question: Should we strip RTL/LTR characters? |
||
| 588 | |||
| 589 | if (mb_substr($arc, 2, 2) == '--') return false; // see Rec. ITU-T X.660, clause 7.5.4 |
||
| 590 | |||
| 591 | $array = array(); |
||
| 592 | preg_match_all('/./u', $arc, $array, PREG_SET_ORDER); |
||
| 593 | $len = count($array); |
||
| 594 | foreach ($array as $i => $char) { |
||
| 595 | if (!iri_char_valid($char[0], $i==0, $i==$len-1)) return false; |
||
| 596 | } |
||
| 597 | |||
| 598 | return true; |
||
| 599 | } |
||
| 600 | |||
| 601 | /** |
||
| 602 | * Checks if an IRI identifier is valid or not. |
||
| 603 | * @author Daniel Marschall, ViaThinkSoft |
||
| 604 | * @version 2014-12-17 |
||
| 13 | daniel-mar | 605 | * @param string $iri<br/> |
| 3 | daniel-mar | 606 | * An OID in OID-IRI notation, e.g. /Example/test |
| 607 | * @return boolean true if the IRI identifier is valid. |
||
| 608 | **/ |
||
| 609 | function iri_valid($iri) { |
||
| 610 | if ($iri == '/') return true; // OK? |
||
| 611 | |||
| 612 | if (substr($iri, 0, 1) != '/') return false; |
||
| 613 | |||
| 614 | $ary = explode('/', $iri); |
||
| 615 | array_shift($ary); |
||
| 616 | foreach ($ary as $a) { |
||
| 617 | if (!iri_arc_valid($a)) return false; |
||
| 618 | } |
||
| 619 | |||
| 620 | return true; |
||
| 621 | } |
||
| 622 | |||
| 623 | /* |
||
| 624 | assert(iri_arc_valid('ABCDEF')); |
||
| 625 | assert(!iri_arc_valid('-ABCDEF')); |
||
| 626 | assert(!iri_arc_valid('ABCDEF-')); |
||
| 627 | assert(!iri_arc_valid(' ABCDEF')); |
||
| 628 | assert(!iri_arc_valid('2 ABCDEF')); |
||
| 629 | assert(!iri_arc_valid('')); |
||
| 630 | |||
| 631 | assert(!iri_valid('')); |
||
| 632 | assert(iri_valid('/')); |
||
| 633 | assert(iri_valid('/hello/world')); |
||
| 634 | assert(iri_valid('/123/world')); |
||
| 635 | assert(!iri_valid('/hello/0world')); |
||
| 636 | assert(!iri_valid('/hello/xo--test')); |
||
| 637 | assert(!iri_valid('/hello/-super-/sd')); |
||
| 638 | */ |
||
| 639 | |||
| 640 | /** |
||
| 641 | * Returns an associative array in the form 'ASN.1' => '/2/1' . |
||
| 642 | * @author Daniel Marschall, ViaThinkSoft |
||
| 643 | * @version 2018-01-05 |
||
| 644 | * @see http://itu.int/go/X660 |
||
| 645 | * @return array<string,string> An associative array in the form 'ASN.1' => '/2/1' . |
||
| 646 | **/ |
||
| 647 | function iri_get_long_arcs() { |
||
| 648 | $iri_long_arcs = array(); |
||
| 649 | $iri_long_arcs['ASN.1'] = '/2/1'; |
||
| 650 | $iri_long_arcs['Country'] = '/2/16'; |
||
| 651 | $iri_long_arcs['International-Organizations'] = '/2/23'; |
||
| 652 | $iri_long_arcs['UUID'] = '/2/25'; |
||
| 653 | $iri_long_arcs['Tag-Based'] = '/2/27'; |
||
| 654 | $iri_long_arcs['BIP'] = '/2/41'; |
||
| 655 | $iri_long_arcs['Telebiometrics'] = '/2/42'; |
||
| 656 | $iri_long_arcs['Cybersecurity'] = '/2/48'; |
||
| 657 | $iri_long_arcs['Alerting'] = '/2/49'; |
||
| 658 | $iri_long_arcs['OIDResolutionSystem'] = '/2/50'; |
||
| 659 | $iri_long_arcs['GS1'] = '/2/51'; |
||
| 660 | $iri_long_arcs['Example'] = '/2/999'; // English |
||
| 661 | $iri_long_arcs['Exemple'] = '/2/999'; // French |
||
| 662 | $iri_long_arcs['Ejemplo'] = '/2/999'; // Spanish |
||
| 663 | $iri_long_arcs["\u{0627}\u{0644}\u{0645}\u{062B}\u{0627}\u{0644}"] = '/2/999'; // Arabic |
||
| 664 | $iri_long_arcs["\u{8303}\u{4F8B}"] = '/2/999'; // Chinese |
||
| 665 | $iri_long_arcs["\u{041F}\u{0440}\u{0438}\u{043C}\u{0435}\u{0440}"] = '/2/999'; // Russian |
||
| 666 | $iri_long_arcs["\u{C608}\u{C81C}"] = '/2/999'; // Korean |
||
| 667 | $iri_long_arcs["\u{4F8B}"] = '/2/999'; // Japanese |
||
| 668 | $iri_long_arcs['Beispiel'] = '/2/999'; // German |
||
| 669 | return $iri_long_arcs; |
||
| 670 | } |
||
| 671 | |||
| 672 | /** |
||
| 673 | * Tries to shorten/simplify an IRI by applying "long arcs", e.g. /2/999/123 -> /Example/123 . |
||
| 674 | * @author Daniel Marschall, ViaThinkSoft |
||
| 675 | * @version 2020-05-22 |
||
| 13 | daniel-mar | 676 | * @param string $iri<br/> |
| 3 | daniel-mar | 677 | * An OID in OID-IRI notation, e.g. /Example/test |
| 678 | * @return string|false The modified IRI. |
||
| 679 | **/ |
||
| 680 | function iri_add_longarcs($iri) { |
||
| 681 | $iri_long_arcs = iri_get_long_arcs(); |
||
| 682 | |||
| 683 | if (!iri_valid($iri)) return false; |
||
| 684 | |||
| 685 | $ary = explode('/', $iri); |
||
| 686 | |||
| 687 | $ary_number_iri = $ary; |
||
| 688 | if ($ary_number_iri[1] == 'Joint-ISO-ITU-T') $ary_number_iri[1] = '2'; |
||
| 689 | |||
| 690 | $number_iri = implode('/', $ary_number_iri); |
||
| 691 | |||
| 692 | foreach ($iri_long_arcs as $cur_longarc => $cur_iri) { |
||
| 693 | assert(iri_valid($cur_iri)); |
||
| 694 | if (strpos($number_iri.'/', $cur_iri.'/') === 0) { |
||
| 695 | $cnt = substr_count($cur_iri, '/'); |
||
| 696 | for ($i=1; $i<$cnt; $i++) { |
||
| 697 | array_shift($ary); |
||
| 698 | } |
||
| 699 | $ary[0] = ''; |
||
| 700 | $ary[1] = $cur_longarc; |
||
| 701 | $iri = implode('/', $ary); |
||
| 702 | break; |
||
| 703 | } |
||
| 704 | } |
||
| 705 | |||
| 706 | return $iri; |
||
| 707 | } |
||
| 708 | /* |
||
| 709 | assert(iri_add_longarcs('/2/999/123') === '/Example/123'); |
||
| 710 | */ |
||
| 711 | |||
| 712 | # === FUNCTIONS FOR OIDS IN ASN.1 NOTATION === |
||
| 713 | |||
| 714 | /** |
||
| 715 | * Checks if an ASN.1 identifier is valid. |
||
| 716 | * @author Daniel Marschall, ViaThinkSoft |
||
| 717 | * @version 2020-05-22 |
||
| 13 | daniel-mar | 718 | * @param string $id<br/> |
| 3 | daniel-mar | 719 | * An ASN.1 identifier, e.g. "example". Not "example(99)" or "99" and not a path like "{ 2 999 }" |
| 720 | * Note: Use asn1_path_valid() for validating a whole ASN.1 notation path. |
||
| 721 | * @return boolean true, if the identifier is valid: It begins with an lowercase letter and contains only 0-9, a-z, A-Z and "-" |
||
| 722 | **/ |
||
| 723 | function oid_id_is_valid($id) { |
||
| 724 | // see Rec. ITU-T X.660 | ISO/IEC 9834-1, clause 7.7 |
||
| 725 | // and Rec. ITU-T X.680 | ISO/IEC 8824-1, clause 12.3 |
||
| 726 | if (substr($id,-1,1) == '-') return false; |
||
| 727 | if (strstr($id,'--')) return false; |
||
| 728 | return preg_match('/^([a-z][a-zA-Z0-9-]*)$/', $id) != 0; |
||
| 729 | } |
||
| 730 | |||
| 731 | /** |
||
| 732 | * Checks if the ASN.1 notation of an OID is valid. |
||
| 733 | * This function does not tolerate leading zeros. |
||
| 734 | * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} is not valid while { iso 123 } is valid. |
||
| 735 | * @author Daniel Marschall, ViaThinkSoft |
||
| 736 | * @version 2014-12-17 |
||
| 13 | daniel-mar | 737 | * @param string $asn1<br/> |
| 3 | daniel-mar | 738 | * An OID in ASN.1 notation. |
| 739 | * @return boolean true if the identifier is valid. |
||
| 740 | **/ |
||
| 741 | function asn1_path_valid($asn1) { |
||
| 742 | return asn1_to_dot($asn1) != false; |
||
| 743 | } |
||
| 744 | |||
| 745 | /** |
||
| 746 | * Returns an array of standardized ASN.1 alphanumeric identifiers which do not require a numeric identifier, e.g. { 2 example } |
||
| 747 | * The array has the form '0.0.a' -> '0.0.1' |
||
| 748 | * @author Daniel Marschall, ViaThinkSoft |
||
| 749 | * @version 2019-03-25 |
||
| 750 | * @see http://www.oid-info.com/name-forms.htm |
||
| 751 | * @return array<string,string> Associative array of standardized ASN.1 alphanumeric identifiers |
||
| 752 | **/ |
||
| 753 | function asn1_get_standardized_array() { |
||
| 754 | |||
| 755 | // Taken from oid-info.com |
||
| 756 | // http://www.oid-info.com/name-forms.htm |
||
| 757 | $standardized = array(); |
||
| 758 | $standardized['itu-t'] = '0'; |
||
| 759 | $standardized['ccitt'] = '0'; |
||
| 760 | $standardized['iso'] = '1'; |
||
| 761 | $standardized['joint-iso-itu-t'] = '2'; |
||
| 762 | $standardized['joint-iso-ccitt'] = '2'; |
||
| 763 | $standardized['0.recommendation'] = '0.0'; |
||
| 764 | $standardized['0.0.a'] = '0.0.1'; |
||
| 765 | $standardized['0.0.b'] = '0.0.2'; |
||
| 766 | $standardized['0.0.c'] = '0.0.3'; |
||
| 767 | $standardized['0.0.d'] = '0.0.4'; |
||
| 768 | $standardized['0.0.e'] = '0.0.5'; |
||
| 769 | $standardized['0.0.f'] = '0.0.6'; |
||
| 770 | $standardized['0.0.g'] = '0.0.7'; |
||
| 771 | $standardized['0.0.h'] = '0.0.8'; |
||
| 772 | $standardized['0.0.i'] = '0.0.9'; |
||
| 773 | $standardized['0.0.j'] = '0.0.10'; |
||
| 774 | $standardized['0.0.k'] = '0.0.11'; |
||
| 775 | $standardized['0.0.l'] = '0.0.12'; |
||
| 776 | $standardized['0.0.m'] = '0.0.13'; |
||
| 777 | $standardized['0.0.n'] = '0.0.14'; |
||
| 778 | $standardized['0.0.o'] = '0.0.15'; |
||
| 779 | $standardized['0.0.p'] = '0.0.16'; |
||
| 780 | $standardized['0.0.q'] = '0.0.17'; |
||
| 781 | $standardized['0.0.r'] = '0.0.18'; |
||
| 782 | $standardized['0.0.s'] = '0.0.19'; |
||
| 783 | $standardized['0.0.t'] = '0.0.20'; |
||
| 784 | $standardized['0.0.u'] = '0.0.21'; |
||
| 785 | $standardized['0.0.v'] = '0.0.22'; |
||
| 786 | $standardized['0.0.w'] = '0.0.23'; // actually, this OID does not exist |
||
| 787 | $standardized['0.0.x'] = '0.0.24'; |
||
| 788 | $standardized['0.0.y'] = '0.0.25'; |
||
| 789 | $standardized['0.0.z'] = '0.0.26'; |
||
| 790 | $standardized['0.question'] = '0.1'; |
||
| 791 | $standardized['0.administration'] = '0.2'; |
||
| 792 | $standardized['0.network-operator'] = '0.3'; |
||
| 793 | $standardized['0.identified-organization'] = '0.4'; |
||
| 794 | $standardized['1.standard'] = '1.0'; |
||
| 795 | $standardized['1.registration-authority'] = '1.1'; |
||
| 796 | $standardized['1.member-body'] = '1.2'; |
||
| 797 | $standardized['1.identified-organization'] = '1.3'; |
||
| 798 | return $standardized; |
||
| 799 | } |
||
| 800 | |||
| 801 | /** |
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| 13 | daniel-mar | 802 | * Converts an OID in ASN.1 notation into an OID in dot notation and tries to resolve well-known identifiers.<br/> |
| 803 | * e.g. {joint-iso-itu-t(2) example(999) 1 2 3} --> 2.999.1.2.3<br/> |
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| 3 | daniel-mar | 804 | * e.g. {iso 3} --> 1.3 |
| 805 | * This function does not tolerate leading zeros. |
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| 806 | * This function will fail (return false) if there are unresolved symbols, e.g. {iso test} will not be resolved to 1.test |
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| 807 | * @author Daniel Marschall, ViaThinkSoft |
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| 808 | * @version 2014-12-17 |
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| 13 | daniel-mar | 809 | * @param string $asn<br/> |
| 3 | daniel-mar | 810 | * An OID in ASN.1 notation. |
| 811 | * @return string|false An OID in dot notation without leading dot or false if the path is invalid. |
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| 812 | **/ |
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| 813 | function asn1_to_dot($asn) { |
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| 814 | $standardized = asn1_get_standardized_array(); |
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| 815 | |||
| 816 | // Clean up |
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| 817 | $count = -1; |
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| 818 | $asn = preg_replace('@^\\{(.+)\\}$@', '\\1', $asn, -1, $count); |
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| 819 | if ($count == 0) return false; // { and } are required. The ASN.1 path will NOT be trimmed by this function |
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| 820 | |||
| 821 | // If identifier is set, apply it (no check if it overrides a standardized identifier) |
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| 822 | $asn = preg_replace('|\s*([a-z][a-zA-Z0-9-]*)\s*\((\d+)\)|', ' \\2', $asn); |
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| 823 | $asn = trim($asn); |
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| 824 | |||
| 825 | // Set dots |
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| 826 | $asn = preg_replace('|\s+|', '.', $asn); |
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| 827 | |||
| 828 | // Apply standardized identifiers (case sensitive) |
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| 829 | $asn .= '.'; |
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| 830 | foreach ($standardized as $s => $r) { |
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| 831 | $asn = preg_replace("@^".preg_quote($s,"@")."@", $r, $asn); |
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| 832 | } |
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| 833 | $asn = substr($asn, 0, strlen($asn)-1); |
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| 834 | |||
| 835 | // Check if all numbers are OK |
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| 836 | // -> every arc must be resolved |
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| 837 | // -> numeric arcs must not have a leading zero |
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| 838 | // -> invalid stuff will be recognized, e.g. a "(1)" without an identifier in front of it |
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| 839 | $ary = explode('.', $asn); |
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| 840 | foreach ($ary as $a) { |
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| 841 | $m = array(); |
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| 842 | if (!preg_match('@^(0|([1-9]\\d*))$@', $a, $m)) return false; |
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| 843 | } |
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| 844 | |||
| 845 | return $asn; |
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| 846 | } |
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| 847 | |||
| 848 | /* |
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| 849 | assert(asn1_to_dot('{2 999 (1)}') == false); |
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| 850 | assert(asn1_to_dot('{2 999 test}') == false); |
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| 851 | assert(asn1_to_dot('{2 999 1}') == '2.999.1'); |
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| 852 | assert(asn1_to_dot(' {2 999 1} ') == false); |
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| 853 | assert(asn1_to_dot('2 999 1') == false); |
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| 854 | assert(asn1_to_dot('{2 999 01}') == false); |
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| 855 | assert(asn1_to_dot('{ 0 question 123 }') == '0.1.123'); |
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| 856 | assert(asn1_to_dot('{ iso }') == '1'); |
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| 857 | assert(asn1_to_dot('{ iso(1) }') == '1'); |
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| 858 | assert(asn1_to_dot('{ iso(2) }') == '2'); |
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| 859 | assert(asn1_to_dot('{ iso 3 }') == '1.3'); |
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| 860 | */ |
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| 861 | |||
| 862 | /** |
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| 863 | * Gets the last numeric identifier of an ASN.1 notation OID. |
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| 864 | * @author Daniel Marschall, ViaThinkSoft |
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| 865 | * @version 2020-06-11 |
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| 13 | daniel-mar | 866 | * @param string $asn1id<br/> |
| 3 | daniel-mar | 867 | * An ASN.1 identifier string, e.g. { 2 example(999) test(1) } |
| 868 | * @return int|false The last numeric identifier arc, e.g. "1" or false if the ID is invalid |
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| 869 | **/ |
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| 870 | function asn1_last_identifier($asn1id) { |
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| 871 | $asn1id = preg_replace('@\(\s*\d+\s*\)@', '', $asn1id); |
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| 872 | $asn1id = trim(str_replace(array('{', '}', "\t"), ' ', $asn1id)); |
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| 873 | $ary = explode(' ', $asn1id); |
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| 874 | $asn1id = $ary[count($ary)-1]; |
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| 875 | return preg_match('#[^0-9]#',$asn1id) ? (int)$asn1id : false; |
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| 876 | } |
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| 877 | |||
| 878 | /** |
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| 13 | daniel-mar | 879 | * "Soft corrects" an invalid ASN.1 identifier.<br/> |
| 3 | daniel-mar | 880 | * Attention, by "soft correcting" the ID, it is not authoritative anymore, and might not be able to be resolved by ORS. |
| 881 | * @author Daniel Marschall, ViaThinkSoft |
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| 882 | * @version 2020-05-22 |
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| 13 | daniel-mar | 883 | * @param string $id<br/> |
| 3 | daniel-mar | 884 | * An ASN.1 identifier. |
| 13 | daniel-mar | 885 | * @param boolean $append_id_prefix<br/> |
| 886 | * true (default): If the identifier doesn't start with a-Z, the problem will be solved by prepending "id-" to the identifier.<br/> |
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| 3 | daniel-mar | 887 | * false: If the identifier doesn't start with a-Z, then the problem cannot be solved (method returns empty string). |
| 13 | daniel-mar | 888 | * @return string The "soft corrected" ASN.1 identifier.<br/> |
| 889 | * Invalid characters will be removed.<br/> |
||
| 890 | * Uncorrectable start elements (0-9 or "-") will be either removed or solved by prepending "id-" (see <code>$append_id_prefix</code>)<br/> |
||
| 3 | daniel-mar | 891 | * If the identifier begins with an upper case letter, the letter will be converted into lower case. |
| 892 | **/ |
||
| 893 | function oid_soft_correct_id($id, $append_id_prefix = true) { |
||
| 894 | // Convert "_" to "-" |
||
| 895 | $id = str_replace('_', '-', $id); |
||
| 896 | |||
| 897 | // Convert "--" to "-" |
||
| 898 | $id = str_replace('--', '-', $id); |
||
| 899 | |||
| 900 | // Remove invalid characters |
||
| 901 | $id = preg_replace('/[^a-zA-Z0-9-]+/', '', $id); |
||
| 902 | |||
| 903 | // Remove uncorrectable start elements (0-9 or "-") |
||
| 904 | if ($append_id_prefix) { |
||
| 905 | $id = preg_replace('/^([^a-zA-Z]+)/', 'id-$1', $id); |
||
| 906 | } else { |
||
| 907 | $id = preg_replace('/^([^a-zA-Z]+)/', '', $id); |
||
| 908 | } |
||
| 909 | |||
| 910 | // "Correct" upper case beginning letter by converting it to lower case |
||
| 911 | if (preg_match('/^[A-Z]/', $id)) { |
||
| 912 | $id = strtolower($id[0]) . substr($id, 1); |
||
| 913 | } |
||
| 914 | |||
| 915 | return $id; |
||
| 916 | } |