clrghouz/app/Classes/FTN/Packet.php

473 lines
13 KiB
PHP

<?php
namespace App\Classes\FTN;
use Carbon\Carbon;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Notification;
use Symfony\Component\HttpFoundation\File\File;
use App\Classes\FTN as FTNBase;
use App\Exceptions\InvalidPacketException;
use App\Models\{Address,Domain,Echomail,Netmail,Software,System,Zone};
use App\Notifications\Netmails\{EchomailBadAddress,NetmailBadAddress};
/**
* Represents a Fidonet Packet, that contains an array of messages.
*
* Thus this object is iterable as an array of Echomail::class or Netmail::class.
*/
abstract class Packet extends FTNBase implements \Iterator, \Countable
{
private const LOGKEY = 'PKT';
protected const PACKED_MSG_LEAD = "\02\00";
protected const PACKED_END = "\00\00";
public const MSG_TYPE2 = 1<<0;
public const MSG_TYPE4 = 1<<2;
// @todo Rename this regex to something more descriptive, ie: FILENAME_REGEX
public const regex = '([[:xdigit:]]{4})(?:-(\d{4,10}))?-(.+)';
/**
* Packet types we support, in specific order for auto-detection to work
*
* @var string[]
*/
public const PACKET_TYPES = [
'2.2' => FTNBase\Packet\FSC45::class,
'2+' => FTNBase\Packet\FSC48::class,
'2e' => FTNBase\Packet\FSC39::class,
'2.0' => FTNBase\Packet\FTS1::class,
];
protected array $header; // Packet Header
protected ?string $name = NULL; // Packet name
public File $file; // Packet filename
protected Address $fftn_p; // Address the packet is from (when packing messages)
protected Address $tftn_p; // Address the packet is to (when packing messages)
protected Collection $messages; // Messages in the Packet
protected string $content; // Outgoing packet data
public Collection $errors; // Messages that fail validation
protected int $index; // Our array index
protected $pass_p = NULL; // Overwrite the packet password (when packing messages)
/* ABSTRACT */
/**
* This function is intended to be implemented in child classes to test if the packet
* is defined by the child object
*
* @see self::PACKET_TYPES
* @param string $header
* @return bool
*/
abstract public static function is_type(string $header): bool;
abstract protected function header(Collection $msgs): string;
/* STATIC */
/**
* Size of the packet header
*
* @return int
*/
public static function header_len(): int
{
return collect(static::HEADER)->sum(function($item) { return Arr::get($item,2); });
}
/**
* Process a packet file
*
* @param mixed $f File handler returning packet data
* @param string $name
* @param int $size
* @param Domain|null $domain
* @return Packet
* @throws InvalidPacketException
*/
public static function process(mixed $f,string $name,int $size,Domain $domain=NULL): self
{
Log::debug(sprintf('%s:+ Opening Packet [%s] with size [%d]',self::LOGKEY,$name,$size));
$o = FALSE;
$header = '';
$read_ptr = 0;
// Determine the type of packet
foreach (self::PACKET_TYPES as $type) {
$header_len = $type::header_len();
// PKT Header
if ($read_ptr < $header_len) {
$header .= fread($f,$header_len-$read_ptr);
$read_ptr = ftell($f);
}
// Could not read header
if (strlen($header) !== $header_len)
throw new InvalidPacketException(sprintf('Length of header [%d] too short',strlen($header)));
if ($type::is_type($header)) {
$o = new $type($header);
break;
}
}
if (! $o)
throw new InvalidPacketException('Cannot determine type of packet.');
$o->name = $name;
$x = fread($f,2);
if (strlen($x) === 2) {
// End of Packet?
if ($x === "\00\00")
return $o;
// Messages start with self::PACKED_MSG_LEAD
elseif ($x !== self::PACKED_MSG_LEAD)
throw new InvalidPacketException('Not a valid packet: '.bin2hex($x));
// No message attached
} else
throw new InvalidPacketException('Not a valid packet, not EOP or SOM:'.bin2hex($x));
Log::info(sprintf('%s:- Packet [%s] is a [%s] packet',self::LOGKEY,$o->name,get_class($o)));
// Work out the packet zone
if ($o->fz && ($o->fd || $domain)) {
$o->zone = Zone::select('zones.*')
->join('domains',['domains.id'=>'zones.domain_id'])
->where('zone_id',$o->fz)
->where('name',$o->fd ?: $domain->name)
->single();
}
// If zone is not set, then we need to use a default zone - the messages may not be from this zone.
if (empty($o->zone)) {
Log::alert(sprintf('%s:! We couldnt work out the packet zone, so we have fallen back to the default for [%d]',self::LOGKEY,$o->fz));
$o->zone = Zone::where('zone_id',$o->fz)
->where('default',TRUE)
->singleOrFail();
}
Log::info(sprintf('%s:- Packet Dated [%s] from [%s] to [%s]',self::LOGKEY,$o->date,$o->fftn_t,$o->tftn_t));
$message = ''; // Current message we are building
$msgbuf = '';
$leader = Message::header_len()+strlen(self::PACKED_MSG_LEAD);
// We loop through reading from the buffer, to find our end of message tag
while ((! feof($f) && ($readbuf=fread($f,$leader)))) {
$read_ptr = ftell($f);
$msgbuf .= $readbuf;
// See if we have our EOM/EOP marker
if ((($end=strpos($msgbuf,"\x00".self::PACKED_MSG_LEAD,$leader)) !== FALSE)
|| (($end=strpos($msgbuf,"\x00".self::PACKED_END,$leader)) !== FALSE))
{
// Parse our message
Log::debug(sprintf('%s:- Message at offset [%d] in [%s]',self::LOGKEY,$read_ptr-strlen($readbuf),$name));
$o->parseMessage(substr($msgbuf,0,$end));
$msgbuf = substr($msgbuf,$end+3);
continue;
// If we have more to read
} elseif ($read_ptr < $size) {
continue;
}
// If we get here
throw new InvalidPacketException(sprintf('Cannot determine END of message/packet: %s|%s',get_class($o),hex_dump($message)));;
}
if ($msgbuf)
throw new InvalidPacketException(sprintf('Unprocessed data in packet: %s|%s',get_class($o),hex_dump($msgbuf)));
return $o;
}
/**
* @param string|null $header
* @throws \Exception
*/
public function __construct(string $header=NULL)
{
$this->messages = collect();
$this->errors = collect();
if ($header)
$this->header = unpack(self::unpackheader(static::HEADER),$header);
}
/**
* @throws \Exception
*/
public function __get($key)
{
//Log::debug(sprintf('%s:/ Requesting key for Packet::class [%s]',self::LOGKEY,$key));
switch ($key) {
// From Addresses
case 'fz': return Arr::get($this->header,'ozone');
case 'fn': return Arr::get($this->header,'onet');
case 'ff': return Arr::get($this->header,'onode');
case 'fp': return Arr::get($this->header,'opoint');
case 'fd': return rtrim(Arr::get($this->header,'odomain',"\x00"));
// To Addresses
case 'tz': return Arr::get($this->header,'dzone');
case 'tn': return Arr::get($this->header,'dnet');
case 'tf': return Arr::get($this->header,'dnode');
case 'tp': return Arr::get($this->header,'dpoint');
case 'td': return rtrim(Arr::get($this->header,'ddomain',"\x00"));
case 'date':
return Carbon::create(
Arr::get($this->header,'y'),
Arr::get($this->header,'m')+1,
Arr::get($this->header,'d'),
Arr::get($this->header,'H'),
Arr::get($this->header,'M'),
Arr::get($this->header,'S')
);
case 'password':
return rtrim(Arr::get($this->header,$key),"\x00");
case 'fftn_t':
case 'fftn':
case 'tftn_t':
case 'tftn':
return parent::__get($key);
case 'product':
return Arr::get($this->header,'prodcode-hi')<<8|Arr::get($this->header,'prodcode-lo');
case 'software':
Software::unguard();
$o = Software::singleOrNew(['code'=>$this->product,'type'=>Software::SOFTWARE_TOSSER]);
Software::reguard();
return $o;
case 'software_ver':
return sprintf('%d.%d',Arr::get($this->header,'prodrev-maj'),Arr::get($this->header,'prodrev-min'));
case 'capability':
// This needs to be defined in child classes, since not all children have it
return NULL;
// Packet Type
case 'type':
return static::TYPE;
// Packet name:
case 'name':
return $this->{$key} ?: sprintf('%08x',timew());
case 'messages':
return $this->{$key};
default:
throw new \Exception('Unknown key: '.$key);
}
}
/**
* Return the packet
*
* @return string
* @throws \Exception
*/
public function __toString(): string
{
return $this->content;
}
/* INTERFACE */
/**
* Number of messages in this packet
*/
public function count(): int
{
return $this->messages->count();
}
public function current(): Echomail|Netmail
{
return $this->messages->get($this->index);
}
public function key(): mixed
{
return $this->index;
}
public function next(): void
{
$this->index++;
}
public function rewind(): void
{
$this->index = 0;
}
public function valid(): bool
{
return (! is_null($this->key())) && $this->messages->has($this->key());
}
/* METHODS */
public function for(Address $ao): self
{
$this->tftn_p = $ao;
$this->fftn_p = our_address($ao);
return $this;
}
/**
* Generate a packet
*
* @return string
*/
public function generate(): string
{
return (string)$this;
}
public function mail(Collection $msgs): self
{
if (! $msgs->count())
throw new InvalidPacketException('Refusing to make an empty packet');
if (empty($this->tftn_p) || empty($this->fftn_p))
throw new InvalidPacketException('Cannot generate a packet without a destination address');
$this->content = $this->header($msgs);
foreach ($msgs as $o)
$this->content .= self::PACKED_MSG_LEAD.$o->packet($this->tftn_p);
$this->content .= "\00\00";
$this->messages = $msgs->map(fn($item)=>$item->only(['id','datetime']));
return $this;
}
/**
* Parse a message in a mail packet
*
* @param string $message
* @throws InvalidPacketException|\Exception
*/
private function parseMessage(string $message): void
{
Log::info(sprintf('%s:+ Processing packet message [%d] bytes',self::LOGKEY,strlen($message)));
$msg = Message::parseMessage($message,$this->zone);
// If the message is invalid, we'll ignore it
if ($msg->errors->count()) {
Log::info(sprintf('%s:- Message [%s] has [%d] errors',self::LOGKEY,$msg->msgid ?: 'No ID',$msg->errors->count()));
// If the messages is not for the right zone, we'll ignore it
if ($msg->errors->has('invalid-zone')) {
Log::alert(sprintf('%s:! Message [%s] is from|to an invalid zone [%s|%s], packet is from [%s] - ignoring it',self::LOGKEY,$msg->msgid,$msg->get_fftn,$msg->get_tftn,$this->fz));
if (! $msg->kludges->get('RESCANNED'))
Notification::route('netmail',$this->fftn)->notify(($msg instanceof Echomail) ? new EchomailBadAddress($msg) : new NetmailBadAddress($msg));
return;
}
// If the $msg->fftn doesnt exist, we'll need to create it
if ($msg->errors->has('from') && $this->fftn && $this->fftn->zone_id) {
Log::debug(sprintf('%s:^ From address [%s] doesnt exist, it needs to be created',self::LOGKEY,$msg->set->get('set_fftn')));
$ao = Address::findFTN($msg->set->get('set_fftn'),TRUE,TRUE);
if ($ao?->exists && ($ao->zone?->domain_id !== $this->fftn->zone->domain_id)) {
Log::alert(sprintf('%s:! From address [%s] domain [%d] doesnt match packet domain [%d]?',self::LOGKEY,$msg->set->get('set_fftn'),$ao->zone?->domain_id,$this->fftn->zone->domain_id));
return;
}
if (! $ao) {
$so = System::createUnknownSystem();
$ao = Address::createFTN($msg->set->get('set_fftn'),$so);
Log::alert(sprintf('%s:- From FTN [%s] is not defined, created new entry for (%d)',self::LOGKEY,$msg->set->get('set_fftn'),$ao->id));
}
$msg->fftn_id = $ao->id;
$msg->errors->forget('from');
$msg->errors->forget('fftn_id');
}
// If the $msg->tftn doesnt exist, we'll need to create it
if ($msg->errors->has('to') && $this->tftn && $this->tftn->zone_id) {
Log::debug(sprintf('%s:^ To address [%s] doesnt exist, it needs to be created',self::LOGKEY,$msg->set->get('set_tftn')));
$ao = Address::findFTN($msg->set->get('set_tftn'),TRUE,TRUE);
if ($ao?->exists && ($ao->zone?->domain_id !== $this->tftn->zone->domain_id)) {
Log::alert(sprintf('%s:! To address [%s] domain [%d] doesnt match packet domain [%d]?',self::LOGKEY,$msg->set->get('set_tftn'),$ao->zone?->domain_id,$this->fftn->zone->domain_id));
return;
}
if (! $ao) {
$so = System::createUnknownSystem();
$ao = Address::createFTN($msg->set->get('set_fftn'),$so);
Log::alert(sprintf('%s:- To FTN [%s] is not defined, created new entry for (%d)',self::LOGKEY,$msg->set->get('set_tftn'),$ao->id));
}
$msg->tftn_id = $ao->id;
$msg->errors->forget('to');
$msg->errors->forget('tftn_id');
}
// If there is no fftn, then its from a system that we dont know about
if (! $this->fftn) {
Log::alert(sprintf('%s:! No further message processing, packet is from a system we dont know about [%s]',self::LOGKEY,$this->fftn_t));
$this->messages->push($msg);
return;
}
}
// @todo If the message from domain (eg: $msg->fftn->zone->domain) is different to the packet address domain ($pkt->fftn->zone->domain), we'll skip this message
Log::debug(sprintf('%s:^ Message [%s] - Packet from domain [%d], Message domain [%d]',self::LOGKEY,$msg->msgid,$this->fftn->zone->domain_id,$msg->fftn->zone->domain_id));
$this->messages->push($msg);
}
/**
* Overwrite the packet password
*
* @param string|null $password
* @return self
*/
public function password(string $password=NULL): self
{
if ($password && (strlen($password) < 9))
$this->pass_p = strtoupper($password);
return $this;
}
}