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IP::fromHexString handle ascii (#15504)

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* IP::fromHexString handle ascii
Some bad MIBs convert the hex to ascii on display.
Attempt to decode that if the situation is detected.

fixes #15501

* add ascii tests
This commit is contained in:
Tony Murray 2023-10-26 10:03:03 -05:00 committed by GitHub
parent 91b829edd3
commit 7e0b41a05a
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 20 additions and 8 deletions
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6
LibreNMS/Util/IP.php
View File

@ -54,6 +54,12 @@ abstract class IP
$hex = str_replace([':', '.'], '', $hex);
// check if hex was incorrectly converted to ascii
$len = strlen($hex);
if (($len == 4 || $len == 16) && preg_match('/[^0-9a-fA-F]/', $hex)) {
$hex = StringHelpers::asciiToHex($hex);
}
try {
if (strlen($hex) == 8) {
return new IPv4(long2ip(hexdec($hex)));

11
LibreNMS/Util/StringHelpers.php
View File

@ -162,4 +162,15 @@ class StringHelpers
{
return $var === null || is_scalar($var) || (is_object($var) && method_exists($var, '__toString'));
}
public static function asciiToHex(string $ascii, string $seperator = ''): string
{
$hex = [];
$len = strlen($ascii);
for ($i = 0; $i < $len; $i++) {
$hex[] = str_pad(strtoupper(dechex(ord($ascii[$i]))), 2, '0', STR_PAD_LEFT);
}
return implode($seperator, $hex);
}
}

9
includes/functions.php
View File

@ -610,14 +610,7 @@ function report_this($message)
function hytera_h2f($number, $nd)
{
if (strlen(str_replace(' ', '', $number)) == 4) {
$hex = '';
for ($i = 0; $i < strlen($number); $i++) {
$byte = strtoupper(dechex(ord($number[$i])));
$byte = str_repeat('0', 2 - strlen($byte)) . $byte;
$hex .= $byte . ' ';
}
$number = $hex;
unset($hex);
$number = \LibreNMS\Util\StringHelpers::asciiToHex($number, ' ');
}
$r = '';
$y = explode(' ', $number);

2
tests/IpTest.php
View File

@ -93,6 +93,7 @@ class IpTest extends TestCase
$this->assertEquals('192.168.1.254', IP::fromHexString('c0 a8 01 fe '));
$this->assertEquals('192.168.1.254', IP::fromHexString('"c0 a8 01 fe"'));
$this->assertEquals('192.168.1.254', IP::fromHexString('192.168.1.254'));
$this->assertEquals('62.40.125.125', IP::fromHexString('>(}}')); // stupid ascii encoded
$this->assertEquals('2001:db8::2:1', IP::fromHexString('2001:db8::2:1'));
$this->assertEquals('2001:db8::2:1', IP::fromHexString('20 01 0d b8 00 00 00 00 00 00 00 00 00 02 00 01'));
@ -100,6 +101,7 @@ class IpTest extends TestCase
$this->assertEquals('2001:db8::2:1', IP::fromHexString('"20:01:0d:b8:00:00:00:00:00:00:00:00:00:02:00:01"'));
$this->assertEquals('2001:db8::2:1', IP::fromHexString('"20.01.0d.b8.00.00.00.00.00.00.00.00.00.02.00.01"'));
$this->assertEquals('2001:db8::2:1', IP::fromHexString('20010db8000000000000000000020001'));
$this->assertEquals('3e28:7d7d:3e28:7d7d:3e28:7d7d:3e28:7d7d', IP::fromHexString('>(}}>(}}>(}}>(}}')); // stupid ascii encoded
$this->assertEquals('::', IP::fromHexString('00000000000000000000000000000000'));