FTN Packet inspection
This commit is contained in:
Deon George
251
app/Classes/FTNMessage.php
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251
app/Classes/FTNMessage.php
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<?php
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namespace App\Classes;
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use App\Exceptions\InvalidFidoPacketException;
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class FTNMessage extends FTN
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{
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private $src = NULL;
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private $dst = NULL;
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private $flags = NULL;
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private $cost = 0;
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private $from = NULL; // FTS-0001.016 From Name: upto 36 chars null terminated
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private $to = NULL; // FTS-0001.016 To Name: upto 36 chars null terminated
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private $subject = NULL; // FTS-0001.016 Subject: upto 72 chars null terminated
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private $date = NULL; // FTS-0001.016 Date: upto 20 chars null terminated
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private $message = NULL; // The actual message content
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private $echoarea = NULL; // FTS-0004.001
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private $intl = NULL;
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private $msgid = NULL;
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private $reply = NULL; // Message thread reply source
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private $origin = NULL; // FTS-0004.001
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private $kludge = []; // Hold kludge items
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private $path = []; // FTS-0004.001
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private $seenby = []; // FTS-0004.001
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private $via = [];
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private $_other = [];
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private $unknown = [];
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private $fqfa = NULL; // Fully qualified fidonet source where packet originated
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private $fqfd = NULL; // Fully qualified fidonet destination address (Netmail)
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// Single value kludge items
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private $_kludge = [
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'chrs' => 'CHRS: ',
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'charset' => 'CHARSET: ',
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'codepage' => 'CODEPAGE: ',
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'pid' => 'PID: ',
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'tid' => 'TID: ',
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];
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public function __construct(string $header)
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{
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// Initialise vars
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$this->kludge = collect(); // The message kludge lines
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$this->path = collect(); // The message PATH lines
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$this->seenby = collect(); // The message SEEN-BY lines
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$this->via = collect(); // The path the message has gone using Via lines
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$this->_other = collect(); // Temporarily hold attributes we dont process yet.
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$this->unknown = collect(); // Temporarily hold attributes we have no logic for.
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// FTS-0001.016 Message header 12 bytes
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// node, net, flags, cost
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$struct = [
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'onode'=>[0x00,'v',2],
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'dnode'=>[0x02,'v',2],
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'onet'=>[0x04,'v',2],
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'dnet'=>[0x06,'v',2],
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'flags'=>[0x08,'v',2],
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'cost'=>[0x0a,'v',2],
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];
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$result = unpack($this->unpackheader($struct),$header);
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$this->src = sprintf('%s/%s',array_get($result,'onet'),array_get($result,'onode'));
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$this->dst = sprintf('%s/%s',array_get($result,'dnet'),array_get($result,'dnode'));
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$this->flags = array_get($result,'flags');
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$this->cost = array_get($result,'cost');
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}
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public function __get($k)
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{
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return $this->{$k};
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}
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public function __set($k,$v)
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{
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switch ($k)
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{
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case 'message':
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// Remove DOS \n\r
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$v = preg_replace("/\n\r/","\r",$v);
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$this->parsemessage($v);
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break;
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case 'origin':
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$this->parseorigin($v);
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break;
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default:
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$this->{$k} = $v;
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}
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}
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public function parsemessage(string $message)
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{
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// Split out the <SOH> lines
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$result = collect(explode("\01",$message))->filter();
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foreach ($result as $k => $v)
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{
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// Search for \r - if that is the end of the line, then its a kludge
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$x = strpos($v,"\r");
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// If there are more characters, then put the kludge back into the result, so that we process it.
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if ($x != strlen($v)-1)
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{
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/**
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* Anything after the origin line is also kludge data.
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*/
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if ($y = strpos($v,"\r * Origin: "))
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{
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$this->message .= substr($v,$x+1,$y-$x-1);
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$this->__set('origin',substr($v,$y));
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$matches = [];
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preg_match('/^.*\((.*)\)$/',$this->origin,$matches);
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if (($this->type() == 'Netmail' AND array_get($matches,1) != $this->fqfa) OR ! array_get($matches,1))
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throw new InvalidFidoPacketException(sprintf('Source address mismatch? [%s,%s]',$this->fqfa,array_get($matches,1)));
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$this->fqfa = array_get($matches,1);
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}
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$v = substr($v,0,$x+1);
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}
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foreach ($this->_kludge as $a => $b) {
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if ($t = $this->kludge($b, $v)) {
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$this->kludge->put($a,$t);
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break;
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}
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}
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if ($t)
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continue;
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if ($t = $this->kludge('AREA:',$v))
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$this->echoarea = $t;
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// From point: <SOH>"FMPT <point number><CR>
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elseif ($t = $this->kludge('FMPT ',$v))
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$this->_other->push($t);
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/*
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* The INTL control paragraph shall be used to give information about
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* the zone numbers of the original sender and the ultimate addressee
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* of a message.
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*
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* <SOH>"INTL "<destination address>" "<origin address><CR>
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*/
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elseif ($t = $this->kludge('INTL ',$v))
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{
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$this->intl = $t;
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list($this->fqfd,$this->fqfa) = explode(' ',$t);
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}
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elseif ($t = $this->kludge('MSGID: ',$v))
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$this->msgid = $t;
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elseif ($t = $this->kludge('PATH: ',$v))
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$this->path->push($t);
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elseif ($t = $this->kludge('REPLY: ',$v))
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$this->reply = $t;
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// To Point: <SOH>TOPT <point number><CR>
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elseif ($t = $this->kludge('TOPT ',$v))
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$this->_other->push($t);
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// Time Zone of the sender.
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elseif ($t = $this->kludge('TZUTC: ',$v))
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$this->tzutc= $t;
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// <SOH>Via <FTN Address> @YYYYMMDD.HHMMSS[.Precise][.Time Zone] <Program Name> <Version> [Serial Number]<CR>
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elseif ($t = $this->kludge('Via ',$v))
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$this->via->push($t);
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// We got a kludge line we dont know about
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else {
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$this->unknown->push(chop($v,"\r"));
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//dd(['v'=>$v,'t'=>$t]);
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}
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}
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}
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/**
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* Process the data after the ORIGIN
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* There may be kludge lines after the origin - notably SEEN-BY
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*
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* @param string $message
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*/
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public function parseorigin(string $message)
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{
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// Split out each line
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$result = collect(explode("\r",$message))->filter();
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foreach ($result as $k => $v) {
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foreach ($this->_kludge as $a => $b) {
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if ($t = $this->kludge($b, $v)) {
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$this->kludge->put($a, $t);
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break;
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}
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}
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if ($t = $this->kludge('SEEN-BY: ', $v))
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$this->seenby->push($t);
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elseif ($t = $this->kludge('PATH: ', $v))
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$this->path->push($t);
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elseif ($t = $this->kludge(' \* Origin: ',$v))
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$this->origin = $t;
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// We got unknown Kludge lines in the origin
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else {
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$this->unknown->push($v);
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//dd(['v'=>$v,'t'=>$t,'message'=>$message]);
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}
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}
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}
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public function description()
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{
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switch ($this->type())
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{
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case 'Echomail': return sprintf('Echomail: '.$this->echoarea);
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case 'Netmail': return sprintf('Netmail: %s->%s',$this->fqfa,$this->fqfd);
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default:
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return 'UNKNOWN';
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}
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}
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public function type()
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{
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if ($this->echoarea)
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return 'Echomail';
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if ($this->intl)
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return 'Netmail';
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return 'UNKNOWN';
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}
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}
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