517 lines
13 KiB
PHP
517 lines
13 KiB
PHP
<?php
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namespace App\Classes\FTN;
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use Carbon\Carbon;
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use Illuminate\Support\Arr;
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use Illuminate\Support\Collection;
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use Illuminate\Support\Facades\Cache;
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use Illuminate\Support\Facades\Log;
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use Symfony\Component\HttpFoundation\File\File;
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use App\Classes\FTN as FTNBase;
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use App\Models\{Address,Software,System,Zone};
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/**
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* Represents the structure of a packet
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*/
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class Packet extends FTNBase implements \Iterator, \Countable
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{
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private const LOGKEY = 'PKT';
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private const BLOCKSIZE = 1024;
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protected const PACKED_MSG_LEAD = "\02\00";
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private const PACKET_TYPES = [
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FTNBase\Packet\FSC45::class,
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FTNBase\Packet\FSC48::class,
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FTNBase\Packet\FSC39::class,
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FTNBase\Packet\FTS1::class,
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];
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protected array $header; // Packet Header
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protected ?string $name; // Packet name
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public File $file; // Packet filename
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public Collection $messages; // Messages in the Packet
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public Collection $errors; // Messages that fail validation
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public bool $use_cache = FALSE; // Use a cache for messages.
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protected int $index; // Our array index
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/**
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* @param string|null $header
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* @throws \Exception
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*/
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public function __construct(string $header=NULL)
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{
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$this->messages = collect();
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$this->errors = collect();
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$this->domain = NULL;
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$this->name = NULL;
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if ($header)
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$this->header = unpack(self::unpackheader(static::HEADER),$header);
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}
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/**
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* @throws \Exception
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*/
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public function __get($key)
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{
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switch ($key) {
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// From Addresses
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case 'fz': return Arr::get($this->header,'ozone');
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case 'fn': return Arr::get($this->header,'onet');
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case 'ff': return Arr::get($this->header,'onode');
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case 'fp': return Arr::get($this->header,'opoint');
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case 'fd': return rtrim(Arr::get($this->header,'odomain',"\x00"));
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// To Addresses
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case 'tz': return Arr::get($this->header,'dzone');
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case 'tn': return Arr::get($this->header,'dnet');
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case 'tf': return Arr::get($this->header,'dnode');
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case 'tp': return Arr::get($this->header,'dpoint');
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case 'td': return rtrim(Arr::get($this->header,'ddomain',"\x00"));
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case 'date':
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return Carbon::create(
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Arr::get($this->header,'y'),
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Arr::get($this->header,'m')+1,
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Arr::get($this->header,'d'),
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Arr::get($this->header,'H'),
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Arr::get($this->header,'M'),
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Arr::get($this->header,'S')
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);
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case 'password':
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return rtrim(Arr::get($this->header,$key),"\x00");
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case 'fftn':
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case 'fftn_o':
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case 'tftn':
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case 'tftn_o':
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return parent::__get($key);
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case 'software':
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$code = Arr::get($this->header,'prodcode-hi')<<8|Arr::get($this->header,'prodcode-lo');
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Software::unguard();
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$o = Software::singleOrNew(['code'=>$code,'type'=>Software::SOFTWARE_TOSSER]);
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Software::reguard();
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return $o;
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case 'software_ver':
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return sprintf('%d.%d',Arr::get($this->header,'prodrev-maj'),Arr::get($this->header,'prodrev-min'));
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case 'capability':
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// This needs to be defined in child classes, since not all children have it
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return NULL;
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// Packet Type
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case 'type':
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return static::TYPE;
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// Packet name:
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case 'name':
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return $this->{$key} ?: sprintf('%08x',timew());
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default:
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throw new \Exception('Unknown key: '.$key);
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}
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}
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/**
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* Return the packet
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*
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* @return string
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* @throws \Exception
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*/
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public function __toString(): string
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{
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$return = $this->header();
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foreach ($this->messages as $o) {
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if ($o->packed)
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$return .= self::PACKED_MSG_LEAD.$o;
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}
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$return .= "\00\00";
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return $return;
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}
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/* STATIC */
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/**
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* Site of the packet header
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*
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* @return int
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*/
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public static function header_len(): int
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{
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return collect(static::HEADER)->sum(function($item) { return Arr::get($item,2); });
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}
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/**
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* This function is intended to be implemented in child classes to test if the packet
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* is defined by the child object
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*
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* @see self::PACKET_TYPES
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* @param string $header
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* @return bool
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*/
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public static function is_type(string $header): bool
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{
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return FALSE;
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}
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/**
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* Process a packet file
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*
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* @param mixed $f
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* @param string $name
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* @param int $size
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* @param System|null $system
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* @param bool $use_cache
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* @return Packet
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* @throws InvalidPacketException
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*/
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public static function process(mixed $f,string $name,int $size,System $system=NULL,bool $use_cache=FALSE): self
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{
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Log::debug(sprintf('%s:+ Opening Packet [%s] with size [%d]',self::LOGKEY,$name,$size));
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$o = FALSE;
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$header = '';
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$read_ptr = 0;
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// Determine the type of packet
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foreach (self::PACKET_TYPES as $type) {
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$header_len = $type::header_len();
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// PKT Header
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if ($read_ptr < $header_len) {
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$header .= fread($f,$header_len-$read_ptr);
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$read_ptr = ftell($f);
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}
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// Could not read header
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if (strlen($header) !== $header_len)
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throw new InvalidPacketException(sprintf('Length of header [%d] too short',strlen($header)));
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if ($type::is_type($header)) {
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$o = new $type($header);
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break;
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}
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}
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if (! $o)
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throw new InvalidPacketException('Cannot determine type of packet.');
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$o->use_cache = $use_cache;
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$o->name = $name;
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$x = fread($f,2);
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// End of Packet?
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if ((strlen($x) === 2) && ($x === "\00\00"))
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return $o;
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// Messages start with self::PACKED_MSG_LEAD
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if ((strlen($x) === 2) && ($x !== self::PACKED_MSG_LEAD))
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throw new InvalidPacketException('Not a valid packet: '.bin2hex($x));
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// No message attached
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else if (! strlen($x))
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throw new InvalidPacketException('No message in packet: '.bin2hex($x));
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$o->zone = $system?->zones->firstWhere('zone_id',$o->fz);
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// If zone is null, we'll take the zone from the packet
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if (! $o->zone)
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$o->zone = Zone::where('zone_id',$o->fz)->where('default',TRUE)->single();
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$buf_ptr = 0;
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$message = '';
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$readbuf = '';
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$last = '';
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while ($buf_ptr || (! feof($f) && ($readbuf=fread($f,self::BLOCKSIZE)))) {
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if (! $buf_ptr)
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$read_ptr = ftell($f);
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// Packed messages are Message::HEADER_LEN, prefixed with self::PACKED_MSG_LEAD
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if (strlen($message) < (Message::HEADER_LEN+strlen(self::PACKED_MSG_LEAD))) {
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$addchars = (Message::HEADER_LEN+strlen(self::PACKED_MSG_LEAD))-strlen($message);
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$message .= substr($readbuf,$buf_ptr,$addchars);
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$buf_ptr += $addchars;
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// If our buffer wasnt big enough...
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if ($buf_ptr >= strlen($readbuf)) {
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$buf_ptr = 0;
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continue;
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}
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}
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// Take 2 chars from the buffer and check if we have our end packet signature
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if ($last && ($buf_ptr == 0)) {
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$last .= substr($readbuf,0,2);
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if (($end=strpos($last,"\x00".self::PACKED_MSG_LEAD,$buf_ptr)) !== FALSE) {
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$o->parseMessage(substr($message,0,$end-2));
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$last = '';
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$message = '';
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$buf_ptr = 1+$end;
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// Loop to rebuild our header for the next message
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continue;
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}
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$last = '';
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}
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if (($end=strpos($readbuf,"\x00".self::PACKED_MSG_LEAD,$buf_ptr)) === FALSE) {
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// Just in case our packet break is at the end of the buffer
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$last = substr($readbuf,-2);
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if ((str_contains($last,"\x00")) && ($size-$read_ptr > 2)) {
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$message .= substr($readbuf,$buf_ptr);
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$buf_ptr = 0;
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continue;
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}
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$last = '';
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$end = strpos($readbuf,"\x00\x00\x00",$buf_ptr);
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}
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// See if we have found the end of the packet, if not read more.
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if ($end === FALSE && ($read_ptr < $size)) {
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$message .= substr($readbuf,$buf_ptr);
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$buf_ptr = 0;
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continue;
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} else {
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$message .= substr($readbuf,$buf_ptr,$end-$buf_ptr);
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$buf_ptr = $end+3;
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if ($buf_ptr >= strlen($readbuf))
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$buf_ptr = 0;
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}
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// Look for the next message
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$o->parseMessage($message);
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$message = '';
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}
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// If our message is still set, then we have an unprocessed message
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if ($message)
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$o->parseMessage($message);
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return $o;
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}
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/**
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* Location of the version
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*
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* @return int
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*/
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public static function version_offset(): int
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{
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return Arr::get(collect(static::HEADER)->get('type'),0);
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}
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public static function version_offset_len(): int
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{
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return Arr::get(collect(static::HEADER)->get('type'),2);
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}
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/* INTERFACE */
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/**
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* Number of messages in this packet
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*/
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public function count(): int
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{
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return $this->messages->count();
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}
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public function current(): Message
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{
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return $this->use_cache ? unserialize(Cache::pull($this->key())) : $this->messages->get($this->index);
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}
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public function key(): mixed
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{
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return $this->use_cache ? $this->messages->get($this->index) : $this->index;
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}
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public function next(): void
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{
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$this->index++;
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}
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public function rewind(): void
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{
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$this->index = 0;
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}
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public function valid(): bool
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{
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return (! is_null($this->key())) && ($this->use_cache ? Cache::has($this->key()) : $this->messages->has($this->key()));
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}
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/* METHODS */
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/**
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* When creating a new packet, set the header.
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*
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* @param Address $oo
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* @param Address $o
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*/
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public function addressHeader(Address $oo,Address $o): void
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{
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Log::debug(sprintf('%s:Creating packet [%s]',self::LOGKEY,$this->name));
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$date = Carbon::now();
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// Create Header
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$this->header = [
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'ozone' => $oo->zone->zone_id, // Orig Zone
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'dzone' => $o->zone->zone_id, // Dest Zone
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'onet' => $oo->host_id ?: $oo->region_id, // Orig Net
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'dnet' => $o->host_id ?: $o->region_id, // Dest Net
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'onode' => $oo->node_id, // Orig Node
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'dnode' => $o->node_id, // Dest Node
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'opoint' => $oo->point_id, // Orig Point
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'dpoint' => $o->point_id, // Dest Point
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'odomain' => $oo->zone->domain->name, // Orig Domain
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'ddomain' => $o->zone->domain->name, // Dest Domain
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'y' => $date->format('Y'), // Year
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'm' => $date->format('m')-1, // Month
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'd' => $date->format('d'), // Day
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'H' => $date->format('H'), // Hour
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'M' => $date->format('i'), // Minute
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'S' => $date->format('s'), // Second
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'password' => $o->session('pktpass'), // Packet Password
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];
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}
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/**
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* Add a netmail message to this packet
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*
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* @param Message $o
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*/
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public function addMail(Message $o): void
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{
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$this->messages->push($o);
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}
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/**
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* Parse a message in a mail packet
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*
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* @param string $message
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* @throws InvalidPacketException|\Exception
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*/
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private function parseMessage(string $message): void
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{
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Log::info(sprintf('%s:Processing message [%d] bytes',self::LOGKEY,strlen($message)));
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$msg = Message::parseMessage($message,$this->zone);
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// If the message is invalid, we'll ignore it
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if ($msg->errors) {
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Log::info(sprintf('%s:- Message [%s] has errors',self::LOGKEY,$msg->msgid));
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// If the from address doenst exist, we'll create a new entry
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if ($msg->errors->messages()->has('to') && $msg->tzone) {
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try {
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// @todo Need to work out the correct region for the host_id
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Address::unguard();
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$ao = Address::firstOrNew([
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'zone_id' => $msg->tzone->id,
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'region_id' => 0,
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'host_id' => $msg->tn,
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'node_id' => $msg->tf,
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'point_id' => $msg->tp,
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'active' => TRUE,
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]);
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Address::reguard();
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} catch (\Exception $e) {
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Log::error(sprintf('%s:! Error finding/creating TO address [%s] for message',self::LOGKEY,$msg->tboss),['error'=>$e->getMessage()]);
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$this->errors->push($msg);
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return;
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}
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$ao->role = Address::NODE_UNKNOWN;
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System::unguard();
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$so = System::firstOrCreate([
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'name' => 'Discovered System',
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'sysop' => 'Unknown',
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'location' => '',
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'active' => TRUE,
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]);
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System::reguard();
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$so->addresses()->save($ao);
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Log::alert(sprintf('%s: - To FTN is not defined, creating new entry for [%s] (%d)',self::LOGKEY,$msg->tboss,$ao->id));
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}
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if ($msg->errors->messages()->has('from') && $msg->tzone) {
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try {
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// @todo Need to work out the correct region for the host_id
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Address::unguard();
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$ao = Address::firstOrNew([
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'zone_id' => $msg->fzone->id,
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'region_id' => 0,
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'host_id' => $msg->fn,
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'node_id' => $msg->ff,
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'point_id' => $msg->fp,
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'active'=> TRUE,
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]);
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Address::reguard();
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} catch (\Exception $e) {
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Log::error(sprintf('%s:! Error finding/creating FROM address [%s] for message',self::LOGKEY,$msg->fboss),['error'=>$e->getMessage()]);
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$this->errors->push($msg);
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return;
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}
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$ao->role = Address::NODE_UNKNOWN;
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System::unguard();
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$so = System::firstOrCreate([
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'name' => 'Discovered System',
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'sysop' => 'Unknown',
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'location' => '',
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'active' => TRUE,
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]);
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System::reguard();
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$so->addresses()->save($ao);
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Log::alert(sprintf('%s: - From FTN is not defined, creating new entry for [%s] (%d)',self::LOGKEY,$msg->fboss,$ao->id));
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}
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if ($msg->errors->messages()->has('user_from') || $msg->errors->messages()->has('user_to')) {
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Log::error(sprintf('%s:! Skipping message [%s] due to errors (%s)...',self::LOGKEY,$msg->msgid,join(',',$msg->errors->messages()->keys())));
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$this->errors->push($msg);
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return;
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}
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}
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if ($this->use_cache) {
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$key = urlencode($msg->msgid ?: sprintf('%s %s',$msg->fftn,Carbon::now()->timestamp));
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if (! Cache::forever($key,serialize($msg)))
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throw new \Exception(sprintf('Caching failed for key [%s]?',$key));
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$this->messages->push($key);
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} else {
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$this->messages->push($msg);
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}
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}
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} |