1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
<?php
/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* A parser for IPv6 address.
*/
class CIPv6Parser extends CParser {
const STATE_NEW = 0;
const STATE_AFTER_DIGITS = 1;
const STATE_AFTER_COLON = 2;
const STATE_AFTER_DBLCOLON = 3;
/**
* @var CIPv4Parser
*/
private $ipv4_parser;
public function __construct() {
$this->ipv4_parser = new CIPv4Parser();
}
/**
* @param string $source
* @param int $pos
*
* @return int
*/
public function parse($source, $pos = 0) {
$this->length = 0;
$this->match = '';
$state = self::STATE_NEW;
$colons = 0;
$dbl_colons = 0;
for ($p = $pos; isset($source[$p]); $p++) {
switch ($state) {
case self::STATE_NEW:
if (self::parseDoubleColon($source, $p)) {
if ($dbl_colons++ == 1) {
return self::PARSE_FAIL;
}
$state = self::STATE_AFTER_DBLCOLON;
}
elseif (self::parseXDigits($source, $p)) {
$state = self::STATE_AFTER_DIGITS;
}
else {
return self::PARSE_FAIL;
}
break;
case self::STATE_AFTER_COLON:
if (self::parseXDigits($source, $p)) {
$state = self::STATE_AFTER_DIGITS;
}
else {
return self::PARSE_FAIL;
}
break;
case self::STATE_AFTER_DBLCOLON:
if (self::parseXDigits($source, $p)) {
$state = self::STATE_AFTER_DIGITS;
}
else {
break 2;
}
break;
case self::STATE_AFTER_DIGITS:
if (self::parseDoubleColon($source, $p)) {
if ($dbl_colons++ == 1) {
return self::PARSE_FAIL;
}
$state = self::STATE_AFTER_DBLCOLON;
}
elseif ($source[$p] == ':') {
if ($colons++ == 7) {
return self::PARSE_FAIL;
}
$state = self::STATE_AFTER_COLON;
}
else {
break 2;
}
break;
}
}
if ($state == self::STATE_AFTER_COLON || $state == self::STATE_NEW) {
return self::PARSE_FAIL;
}
if (isset($source[$p]) && $source[$p] == '.' && $state == self::STATE_AFTER_DIGITS
&& ($colons != 0 || $dbl_colons != 0)) {
if (($dbl_colons == 0 && $colons != 6) || ($dbl_colons == 1 && $colons > 4)) {
return self::PARSE_FAIL;
}
while ($source[$p - 1] != ':') {
$p--;
}
if ($this->ipv4_parser->parse($source, $p) == self::PARSE_FAIL) {
return self::PARSE_FAIL;
}
$p += $this->ipv4_parser->getLength();
}
elseif (($dbl_colons == 0 && $colons != 7) || ($dbl_colons == 1 && $colons > 5)) {
return self::PARSE_FAIL;
}
$this->length = $p - $pos;
$this->match = substr($source, $pos, $this->length);
return (isset($source[$pos + $this->length]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS);
}
private static function parseDoubleColon($source, &$pos) {
$p = $pos;
if ($source[$p] !== ':') {
return false;
}
$p++;
if (!isset($source[$p]) || $source[$p] !== ':') {
return false;
}
$pos = $p;
return true;
}
private static function parseXDigits($source, &$pos) {
$p = $pos;
while (isset($source[$p]) && ctype_xdigit($source[$p])) {
$p++;
}
if ($p == $pos || $p - $pos > 4) {
return false;
}
$pos = $p - 1;
return true;
}
}
|
