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Reduce the exception noise with queries that we dont parse correctly

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This commit is contained in:
Deon George 2023-10-03 20:58:23 +11:00
parent 2a50a1d795
commit 073d95f605
3 changed files with 14 additions and 6 deletions
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2
app/Classes/Protocol/DNS.php
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@ -59,8 +59,8 @@ final class DNS extends BaseProtocol
public const DNS_TYPE_SOA = 6; // SOA Records
public const DNS_TYPE_MX = 15; // MX Records
public const DNS_TYPE_TXT = 16; // TXT Records
public const DNS_TYPE_AAAA = 28; // AAAA Records
public const DNS_TYPE_SRV = 33; // SRV Records
public const DNS_TYPE_OPT = 41; // OPT Records
public const DNS_TYPE_DS = 43; // DS Records (Delegation signer RFC 4034)

6
app/Classes/Protocol/DNS/Query.php
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@ -50,7 +50,7 @@ final class Query
$this->labels = collect();
while (($len=ord(substr($this->buf,$rx_ptr++,1))) !== 0x00) {
$this->labels->push(substr($this->buf,$rx_ptr,$len));
$this->labels->push(strtolower(substr($this->buf,$rx_ptr,$len)));
$rx_ptr += $len;
}
@ -74,8 +74,8 @@ final class Query
if ($this->arcount) {
// Additional records, EDNS: https://datatracker.ietf.org/doc/html/rfc6891
if (($haystack = strstr(substr($this->buf,$rx_ptr+1+10),"\x00",true)) !== FALSE) {
Log::error(sprintf('%s:! DNS additional record format error?',self::LOGKEY));
// @todo catch this
Log::error(sprintf('%s:! DNS additional record format error?',self::LOGKEY),['buf'=>hex_dump($this->buf)]);
return;
}
$this->additional = new RR(substr($this->buf,$rx_ptr,(strlen($haystack) === 0) ? NULL : strlen($haystack)));

8
app/Classes/Protocol/DNS/RR.php
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@ -4,6 +4,7 @@ namespace App\Classes\Protocol\DNS;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;
use App\Classes\Protocol\DNS;
@ -26,8 +27,15 @@ final class RR
$domain = strstr($buf,"\x00",TRUE);
$i += strlen($domain)+1;
try {
$this->type = Arr::get(unpack('n',substr($buf,$i,2)),1);
$this->class = Arr::get(unpack('n',substr($buf,$i+2,2)),1);
} catch (\ErrorException $e) {
Log::error(sprintf('%s:! Error unpacking buffer [%s]',self::LOGKEY,$buf),['buf'=>hex_dump($buf)]);
return;
}
$i += 4;
switch ($this->type) {