clrghouz/app/Classes/FTN/Packet.php

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<?php
namespace App\Classes\FTN;
use Carbon\Carbon;
use Illuminate\Support\Arr;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Cache;
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use Illuminate\Support\Facades\Log;
use Symfony\Component\HttpFoundation\File\File;
use App\Classes\FTN as FTNBase;
use App\Models\{Address,Software,System,Zone};
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/**
* Represents the structure of a message bundle
*/
class Packet extends FTNBase implements \Iterator, \Countable
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{
private const LOGKEY = 'PKT';
private const BLOCKSIZE = 1024;
protected const PACKED_MSG_LEAD = "\02\00";
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,
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];
protected array $header; // Packet Header
protected ?string $name; // Packet name
public File $file; // Packet filename
public Collection $messages; // Messages in the Packet
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public Collection $errors; // Messages that fail validation
public bool $use_cache = FALSE; // Use a cache for messages.
protected int $index; // Our array index
/**
* @param string|null $header
* @throws \Exception
*/
public function __construct(string $header=NULL)
{
$this->messages = collect();
$this->errors = collect();
$this->domain = NULL;
$this->name = NULL;
if ($header)
$this->header = unpack(self::unpackheader(static::HEADER),$header);
}
/**
* @throws \Exception
*/
public function __get($key)
{
switch ($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':
case 'fftn_o':
case 'tftn':
case 'tftn_o':
return parent::__get($key);
case 'software':
$code = Arr::get($this->header,'prodcode-hi')<<8|Arr::get($this->header,'prodcode-lo');
Software::unguard();
$o = Software::singleOrNew(['code'=>$code,'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());
default:
throw new \Exception('Unknown key: '.$key);
}
}
/**
* Return the packet
*
* @return string
* @throws \Exception
*/
public function __toString(): string
{
$return = $this->header();
foreach ($this->messages as $o) {
if ($o->packed)
$return .= self::PACKED_MSG_LEAD.$o;
}
$return .= "\00\00";
return $return;
}
/* STATIC */
/**
* Site of the packet header
*
* @return int
*/
public static function header_len(): int
{
return collect(static::HEADER)->sum(function($item) { return Arr::get($item,2); });
}
/**
* 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
*/
public static function is_type(string $header): bool
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{
return FALSE;
}
/**
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* Process a packet file
*
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* @param mixed $f
* @param string $name
* @param int $size
* @param System|null $system
* @param bool $use_cache
* @return Packet
* @throws InvalidPacketException
*/
public static function process(mixed $f,string $name,int $size,System $system=NULL,bool $use_cache=FALSE): self
{
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Log::debug(sprintf('%s:+ Opening Packet [%s] with size [%d]',self::LOGKEY,$name,$size));
$o = FALSE;
$header = '';
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$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->use_cache = $use_cache;
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$o->name = $name;
$x = fread($f,2);
// End of Packet?
if ((strlen($x) === 2) && ($x === "\00\00"))
return $o;
// Messages start with self::PACKED_MSG_LEAD
if ((strlen($x) === 2) && ($x !== self::PACKED_MSG_LEAD))
throw new InvalidPacketException('Not a valid packet: '.bin2hex($x));
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// No message attached
else if (! strlen($x))
throw new InvalidPacketException('No message in packet: '.bin2hex($x));
$o->zone = $system?->zones->firstWhere('zone_id',$o->fz);
// If zone is null, we'll take the zone from the packet
if (! $o->zone)
$o->zone = Zone::where('zone_id',$o->fz)->where('default',TRUE)->single();
$buf_ptr = 0;
$message = '';
$readbuf = '';
$last = '';
while ($buf_ptr || (! feof($f) && ($readbuf=fread($f,self::BLOCKSIZE)))) {
if (! $buf_ptr)
$read_ptr = ftell($f);
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// Packed messages are Message::HEADER_LEN, prefixed with self::PACKED_MSG_LEAD
if (strlen($message) < (Message::HEADER_LEN+strlen(self::PACKED_MSG_LEAD))) {
$addchars = (Message::HEADER_LEN+strlen(self::PACKED_MSG_LEAD))-strlen($message);
$message .= substr($readbuf,$buf_ptr,$addchars);
$buf_ptr += $addchars;
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// If our buffer wasnt big enough...
if ($buf_ptr >= strlen($readbuf)) {
$buf_ptr = 0;
continue;
}
}
// Take 2 chars from the buffer and check if we have our end packet signature
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if ($last && ($buf_ptr === 0)) {
$last .= substr($readbuf,0,2);
if (($end=strpos($last,"\x00".self::PACKED_MSG_LEAD,$buf_ptr)) !== FALSE) {
$o->parseMessage(substr($message,0,$end-2));
$last = '';
$message = '';
$buf_ptr = 1+$end;
// Loop to rebuild our header for the next message
continue;
}
$last = '';
}
if (($end=strpos($readbuf,"\x00".self::PACKED_MSG_LEAD,$buf_ptr)) === FALSE) {
// Just in case our packet break is at the end of the buffer
$last = substr($readbuf,-2);
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if ((str_contains($last,"\x00")) && ($size-$read_ptr > 2)) {
$message .= substr($readbuf,$buf_ptr);
$buf_ptr = 0;
continue;
}
$last = '';
$end = strpos($readbuf,"\x00\x00\x00",$buf_ptr);
}
// See if we have found the end of the packet, if not read more.
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if ($end === FALSE && ($read_ptr < $size)) {
$message .= substr($readbuf,$buf_ptr);
$buf_ptr = 0;
continue;
} else {
$message .= substr($readbuf,$buf_ptr,$end-$buf_ptr);
$buf_ptr = $end+3;
if ($buf_ptr >= strlen($readbuf))
$buf_ptr = 0;
}
// Look for the next message
$o->parseMessage($message);
$message = '';
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}
// If our message is still set, then we have an unprocessed message
if ($message)
$o->parseMessage($message);
return $o;
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}
/**
* Location of the version
*
* @return int
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*/
public static function version_offset(): int
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{
return Arr::get(collect(static::HEADER)->get('type'),0);
}
public static function version_offset_len(): int
{
return Arr::get(collect(static::HEADER)->get('type'),2);
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}
/* INTERFACE */
/**
* Number of messages in this packet
*/
public function count(): int
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{
return $this->messages->count();
}
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public function current(): Message
{
return $this->use_cache ? unserialize(Cache::pull($this->key())) : $this->messages->get($this->index);
}
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public function key(): mixed
{
return $this->use_cache ? $this->messages->get($this->index) : $this->index;
}
public function next(): void
{
$this->index++;
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}
public function rewind(): void
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{
$this->index = 0;
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}
public function valid(): bool
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{
return (! is_null($this->key())) && ($this->use_cache ? Cache::has($this->key()) : $this->messages->has($this->key()));
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}
/* METHODS */
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/**
* When creating a new packet, set the header.
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*
* @param Address $oo
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* @param Address $o
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*/
public function addressHeader(Address $oo,Address $o): void
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{
Log::debug(sprintf('%s:+ Creating packet for [%s]',self::LOGKEY,$o->ftn));
$date = Carbon::now();
// Create Header
$this->header = [
'ozone' => $oo->zone->zone_id, // Orig Zone
'dzone' => $o->zone->zone_id, // Dest Zone
'onet' => $oo->host_id ?: $oo->region_id, // Orig Net
'dnet' => $o->host_id ?: $o->region_id, // Dest Net
'onode' => $oo->node_id, // Orig Node
'dnode' => $o->node_id, // Dest Node
'opoint' => $oo->point_id, // Orig Point
'dpoint' => $o->point_id, // Dest Point
'odomain' => $oo->zone->domain->name, // Orig Domain
'ddomain' => $o->zone->domain->name, // Dest Domain
'y' => $date->format('Y'), // Year
'm' => $date->format('m')-1, // Month
'd' => $date->format('d'), // Day
'H' => $date->format('H'), // Hour
'M' => $date->format('i'), // Minute
'S' => $date->format('s'), // Second
'password' => $o->session('pktpass'), // Packet Password
];
}
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/**
* Add a message to this packet
*
* @param Message $o
*/
public function addMail(Message $o): void
{
$this->messages->push($o);
}
/**
* Parse a message in a mail packet
*
* @param string $message
* @throws InvalidPacketException|\Exception
*/
private function parseMessage(string $message): void
{
Log::info(sprintf('%s:Processing message [%d] bytes',self::LOGKEY,strlen($message)));
$msg = Message::parseMessage($message,$this->zone);
// If the message is invalid, we'll ignore it
if ($msg->errors) {
Log::info(sprintf('%s:- Message [%s] has errors',self::LOGKEY,$msg->msgid));
// If the from address doenst exist, we'll create a new entry
if ($msg->errors->messages()->has('to') && $msg->tzone) {
try {
// @todo Need to work out the correct region for the host_id
Address::unguard();
$ao = Address::firstOrNew([
'zone_id' => $msg->tzone->id,
//'region_id' => 0,
'host_id' => $msg->tn,
'node_id' => $msg->tf,
'point_id' => $msg->tp,
'active' => TRUE,
]);
Address::reguard();
if (is_null($ao->region_id))
$ao->region_id = $ao->host_id;
} catch (\Exception $e) {
Log::error(sprintf('%s:! Error finding/creating TO address [%s] for message',self::LOGKEY,$msg->tboss),['error'=>$e->getMessage()]);
$this->errors->push($msg);
return;
}
$ao->role = Address::NODE_UNKNOWN;
System::unguard();
$so = System::firstOrCreate([
'name' => 'Discovered System',
'sysop' => 'Unknown',
'location' => '',
'active' => TRUE,
]);
System::reguard();
$so->addresses()->save($ao);
Log::alert(sprintf('%s: - To FTN is not defined, creating new entry for [%s] (%d)',self::LOGKEY,$msg->tboss,$ao->id));
}
if ($msg->errors->messages()->has('from') && $msg->tzone) {
try {
// @todo Need to work out the correct region for the host_id
Address::unguard();
$ao = Address::firstOrNew([
'zone_id' => $msg->fzone->id,
//'region_id' => 0,
'host_id' => $msg->fn,
'node_id' => $msg->ff,
'point_id' => $msg->fp,
'active'=> TRUE,
]);
Address::reguard();
if (is_null($ao->region_id))
$ao->region_id = $ao->host_id;
} catch (\Exception $e) {
Log::error(sprintf('%s:! Error finding/creating FROM address [%s] for message',self::LOGKEY,$msg->fboss),['error'=>$e->getMessage()]);
$this->errors->push($msg);
return;
}
$ao->role = Address::NODE_UNKNOWN;
System::unguard();
$so = System::firstOrCreate([
'name' => 'Discovered System',
'sysop' => 'Unknown',
'location' => '',
'active' => TRUE,
]);
System::reguard();
$so->addresses()->save($ao);
Log::alert(sprintf('%s: - From FTN is not defined, creating new entry for [%s] (%d)',self::LOGKEY,$msg->fboss,$ao->id));
}
if ($msg->errors->messages()->has('user_from') || $msg->errors->messages()->has('user_to')) {
Log::error(sprintf('%s:! Skipping message [%s] due to errors (%s)...',self::LOGKEY,$msg->msgid,join(',',$msg->errors->messages()->keys())));
$this->errors->push($msg);
return;
}
}
if ($this->use_cache) {
$key = urlencode($msg->msgid ?: sprintf('%s %s',$msg->fftn,Carbon::now()->timestamp));
if (! Cache::forever($key,serialize($msg)))
throw new \Exception(sprintf('Caching failed for key [%s]?',$key));
$this->messages->push($key);
} else {
$this->messages->push($msg);
}
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}
}