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Reader.php��0000644��00000026570�15152604275�0006500 0��ustar�00��<?php declare(strict_types=1); namespace MaxMind\Db; use ArgumentCountError; use BadMethodCallException; use Exception; use InvalidArgumentException; use MaxMind\Db\Reader\Decoder; use MaxMind\Db\Reader\InvalidDatabaseException; use MaxMind\Db\Reader\Metadata; use MaxMind\Db\Reader\Util; use UnexpectedValueException; /** * Instances of this class provide a reader for the MaxMind DB format. IP * addresses can be looked up using the get method. / class Reader { /* * @var int / private static $DATA_SECTION_SEPARATOR_SIZE = 16; /* * @var string / private static $METADATA_START_MARKER = "\xAB\xCD\xEFMaxMind.com"; /* * @var int / private static $METADATA_START_MARKER_LENGTH = 14; /* * @var int / private static $METADATA_MAX_SIZE = 131072; // 128 1024 = 128KiB /** * @var Decoder / private $decoder; /* * @var resource / private $fileHandle; /* * @var int / private $fileSize; /* * @var int / private $ipV4Start; /* * @var Metadata / private $metadata; /* * Constructs a Reader for the MaxMind DB format. The file passed to it must * be a valid MaxMind DB file such as a GeoIp2 database file. * * @param string $database * the MaxMind DB file to use * * @throws InvalidArgumentException for invalid database path or unknown arguments * @throws InvalidDatabaseException * if the database is invalid or there is an error reading * from it / public function __construct(string $database) { if (\func_num_args() !== 1) { throw new ArgumentCountError( sprintf('%s() expects exactly 1 parameter, %d given', __METHOD__, \func_num_args()) ); } $fileHandle = @fopen($database, 'rb'); if ($fileHandle === false) { throw new InvalidArgumentException( "The file \"$database\" does not exist or is not readable." ); } $this->fileHandle = $fileHandle; $fileSize = @filesize($database); if ($fileSize === false) { throw new UnexpectedValueException( "Error determining the size of \"$database\"." ); } $this->fileSize = $fileSize; $start = $this->findMetadataStart($database); $metadataDecoder = new Decoder($this->fileHandle, $start); [$metadataArray] = $metadataDecoder->decode($start); $this->metadata = new Metadata($metadataArray); $this->decoder = new Decoder( $this->fileHandle, $this->metadata->searchTreeSize + self::$DATA_SECTION_SEPARATOR_SIZE ); $this->ipV4Start = $this->ipV4StartNode(); } /* * Retrieves the record for the IP address. * * @param string $ipAddress * the IP address to look up * * @throws BadMethodCallException if this method is called on a closed database * @throws InvalidArgumentException if something other than a single IP address is passed to the method * @throws InvalidDatabaseException * if the database is invalid or there is an error reading * from it * * @return mixed the record for the IP address / public function get(string $ipAddress) { if (\func_num_args() !== 1) { throw new ArgumentCountError( sprintf('%s() expects exactly 1 parameter, %d given', __METHOD__, \func_num_args()) ); } [$record] = $this->getWithPrefixLen($ipAddress); return $record; } /* * Retrieves the record for the IP address and its associated network prefix length. * * @param string $ipAddress * the IP address to look up * * @throws BadMethodCallException if this method is called on a closed database * @throws InvalidArgumentException if something other than a single IP address is passed to the method * @throws InvalidDatabaseException * if the database is invalid or there is an error reading * from it * * @return array an array where the first element is the record and the * second the network prefix length for the record / public function getWithPrefixLen(string $ipAddress): array { if (\func_num_args() !== 1) { throw new ArgumentCountError( sprintf('%s() expects exactly 1 parameter, %d given', __METHOD__, \func_num_args()) ); } if (!\is_resource($this->fileHandle)) { throw new BadMethodCallException( 'Attempt to read from a closed MaxMind DB.' ); } [$pointer, $prefixLen] = $this->findAddressInTree($ipAddress); if ($pointer === 0) { return [null, $prefixLen]; } return [$this->resolveDataPointer($pointer), $prefixLen]; } private function findAddressInTree(string $ipAddress): array { $packedAddr = @inet_pton($ipAddress); if ($packedAddr === false) { throw new InvalidArgumentException( "The value \"$ipAddress\" is not a valid IP address." ); } $rawAddress = unpack('C', $packedAddr); $bitCount = \count($rawAddress) * 8; // The first node of the tree is always node 0, at the beginning of the // value $node = 0; $metadata = $this->metadata; // Check if we are looking up an IPv4 address in an IPv6 tree. If this // is the case, we can skip over the first 96 nodes. if ($metadata->ipVersion === 6) { if ($bitCount === 32) { $node = $this->ipV4Start; } } elseif ($metadata->ipVersion === 4 && $bitCount === 128) { throw new InvalidArgumentException( "Error looking up $ipAddress. You attempted to look up an" . ' IPv6 address in an IPv4-only database.' ); } $nodeCount = $metadata->nodeCount; for ($i = 0; $i < $bitCount && $node < $nodeCount; ++$i) { $tempBit = 0xFF & $rawAddress[($i >> 3) + 1]; $bit = 1 & ($tempBit >> 7 - ($i % 8)); $node = $this->readNode($node, $bit); } if ($node === $nodeCount) { // Record is empty return [0, $i]; } if ($node > $nodeCount) { // Record is a data pointer return [$node, $i]; } throw new InvalidDatabaseException( 'Invalid or corrupt database. Maximum search depth reached without finding a leaf node' ); } private function ipV4StartNode(): int { // If we have an IPv4 database, the start node is the first node if ($this->metadata->ipVersion === 4) { return 0; } $node = 0; for ($i = 0; $i < 96 && $node < $this->metadata->nodeCount; ++$i) { $node = $this->readNode($node, 0); } return $node; } private function readNode(int $nodeNumber, int $index): int { $baseOffset = $nodeNumber * $this->metadata->nodeByteSize; switch ($this->metadata->recordSize) { case 24: $bytes = Util::read($this->fileHandle, $baseOffset + $index * 3, 3); [, $node] = unpack('N', "\x00" . $bytes); return $node; case 28: $bytes = Util::read($this->fileHandle, $baseOffset + 3 * $index, 4); if ($index === 0) { $middle = (0xF0 & \ord($bytes[3])) >> 4; } else { $middle = 0x0F & \ord($bytes[0]); } [, $node] = unpack('N', \chr($middle) . substr($bytes, $index, 3)); return $node; case 32: $bytes = Util::read($this->fileHandle, $baseOffset + $index * 4, 4); [, $node] = unpack('N', $bytes); return $node; default: throw new InvalidDatabaseException( 'Unknown record size: ' . $this->metadata->recordSize ); } } /** * @return mixed / private function resolveDataPointer(int $pointer) { $resolved = $pointer - $this->metadata->nodeCount + $this->metadata->searchTreeSize; if ($resolved >= $this->fileSize) { throw new InvalidDatabaseException( "The MaxMind DB file's search tree is corrupt" ); } [$data] = $this->decoder->decode($resolved); return $data; } / * This is an extremely naive but reasonably readable implementation. There * are much faster algorithms (e.g., Boyer-Moore) for this if speed is ever * an issue, but I suspect it won't be. / private function findMetadataStart(string $filename): int { $handle = $this->fileHandle; $fstat = fstat($handle); $fileSize = $fstat['size']; $marker = self::$METADATA_START_MARKER; $markerLength = self::$METADATA_START_MARKER_LENGTH; $minStart = $fileSize - min(self::$METADATA_MAX_SIZE, $fileSize); for ($offset = $fileSize - $markerLength; $offset >= $minStart; --$offset) { if (fseek($handle, $offset) !== 0) { break; } $value = fread($handle, $markerLength); if ($value === $marker) { return $offset + $markerLength; } } throw new InvalidDatabaseException( "Error opening database file ($filename). " . 'Is this a valid MaxMind DB file?' ); } /* * @throws InvalidArgumentException if arguments are passed to the method * @throws BadMethodCallException if the database has been closed * * @return Metadata object for the database / public function metadata(): Metadata { if (\func_num_args()) { throw new ArgumentCountError( sprintf('%s() expects exactly 0 parameters, %d given', __METHOD__, \func_num_args()) ); } // Not technically required, but this makes it consistent with // C extension and it allows us to change our implementation later. if (!\is_resource($this->fileHandle)) { throw new BadMethodCallException( 'Attempt to read from a closed MaxMind DB.' ); } return clone $this->metadata; } /* * Closes the MaxMind DB and returns resources to the system. * * @throws Exception * if an I/O error occurs / public function close(): void { if (\func_num_args()) { throw new ArgumentCountError( sprintf('%s() expects exactly 0 parameters, %d given', __METHOD__, \func_num_args()) ); } if (!\is_resource($this->fileHandle)) { throw new BadMethodCallException( 'Attempt to close a closed MaxMind DB.' ); } fclose($this->fileHandle); } } ��Reader/Decoder.php��0000644��00000024304�15152604275�0010036 0��ustar�00��<?php declare(strict_types=1); namespace MaxMind\Db\Reader; // @codingStandardsIgnoreLine use RuntimeException; class Decoder { /* * @var resource / private $fileStream; /* * @var int / private $pointerBase; /* * @var float / private $pointerBaseByteSize; /* * This is only used for unit testing. * * @var bool / private $pointerTestHack; /* * @var bool / private $switchByteOrder; private const _EXTENDED = 0; private const _POINTER = 1; private const _UTF8_STRING = 2; private const _DOUBLE = 3; private const _BYTES = 4; private const _UINT16 = 5; private const _UINT32 = 6; private const _MAP = 7; private const _INT32 = 8; private const _UINT64 = 9; private const _UINT128 = 10; private const _ARRAY = 11; private const _CONTAINER = 12; private const _END_MARKER = 13; private const _BOOLEAN = 14; private const _FLOAT = 15; /* * @param resource $fileStream / public function __construct( $fileStream, int $pointerBase = 0, bool $pointerTestHack = false ) { $this->fileStream = $fileStream; $this->pointerBase = $pointerBase; $this->pointerBaseByteSize = $pointerBase > 0 ? log($pointerBase, 2) / 8 : 0; $this->pointerTestHack = $pointerTestHack; $this->switchByteOrder = $this->isPlatformLittleEndian(); } public function decode(int $offset): array { $ctrlByte = \ord(Util::read($this->fileStream, $offset, 1)); ++$offset; $type = $ctrlByte >> 5; // Pointers are a special case, we don't read the next $size bytes, we // use the size to determine the length of the pointer and then follow // it. if ($type === self::_POINTER) { [$pointer, $offset] = $this->decodePointer($ctrlByte, $offset); // for unit testing if ($this->pointerTestHack) { return [$pointer]; } [$result] = $this->decode($pointer); return [$result, $offset]; } if ($type === self::_EXTENDED) { $nextByte = \ord(Util::read($this->fileStream, $offset, 1)); $type = $nextByte + 7; if ($type < 8) { throw new InvalidDatabaseException( 'Something went horribly wrong in the decoder. An extended type ' . 'resolved to a type number < 8 (' . $type . ')' ); } ++$offset; } [$size, $offset] = $this->sizeFromCtrlByte($ctrlByte, $offset); return $this->decodeByType($type, $offset, $size); } private function decodeByType(int $type, int $offset, int $size): array { switch ($type) { case self::_MAP: return $this->decodeMap($size, $offset); case self::_ARRAY: return $this->decodeArray($size, $offset); case self::_BOOLEAN: return [$this->decodeBoolean($size), $offset]; } $newOffset = $offset + $size; $bytes = Util::read($this->fileStream, $offset, $size); switch ($type) { case self::_BYTES: case self::_UTF8_STRING: return [$bytes, $newOffset]; case self::_DOUBLE: $this->verifySize(8, $size); return [$this->decodeDouble($bytes), $newOffset]; case self::_FLOAT: $this->verifySize(4, $size); return [$this->decodeFloat($bytes), $newOffset]; case self::_INT32: return [$this->decodeInt32($bytes, $size), $newOffset]; case self::_UINT16: case self::_UINT32: case self::_UINT64: case self::_UINT128: return [$this->decodeUint($bytes, $size), $newOffset]; default: throw new InvalidDatabaseException( 'Unknown or unexpected type: ' . $type ); } } private function verifySize(int $expected, int $actual): void { if ($expected !== $actual) { throw new InvalidDatabaseException( "The MaxMind DB file's data section contains bad data (unknown data type or corrupt data)" ); } } private function decodeArray(int $size, int $offset): array { $array = []; for ($i = 0; $i < $size; ++$i) { [$value, $offset] = $this->decode($offset); $array[] = $value; } return [$array, $offset]; } private function decodeBoolean(int $size): bool { return $size !== 0; } private function decodeDouble(string $bytes): float { // This assumes IEEE 754 doubles, but most (all?) modern platforms // use them. [, $double] = unpack('E', $bytes); return $double; } private function decodeFloat(string $bytes): float { // This assumes IEEE 754 floats, but most (all?) modern platforms // use them. [, $float] = unpack('G', $bytes); return $float; } private function decodeInt32(string $bytes, int $size): int { switch ($size) { case 0: return 0; case 1: case 2: case 3: $bytes = str_pad($bytes, 4, "\x00", \STR_PAD_LEFT); break; case 4: break; default: throw new InvalidDatabaseException( "The MaxMind DB file's data section contains bad data (unknown data type or corrupt data)" ); } [, $int] = unpack('l', $this->maybeSwitchByteOrder($bytes)); return $int; } private function decodeMap(int $size, int $offset): array { $map = []; for ($i = 0; $i < $size; ++$i) { [$key, $offset] = $this->decode($offset); [$value, $offset] = $this->decode($offset); $map[$key] = $value; } return [$map, $offset]; } private function decodePointer(int $ctrlByte, int $offset): array { $pointerSize = (($ctrlByte >> 3) & 0x3) + 1; $buffer = Util::read($this->fileStream, $offset, $pointerSize); $offset = $offset + $pointerSize; switch ($pointerSize) { case 1: $packed = \chr($ctrlByte & 0x7) . $buffer; [, $pointer] = unpack('n', $packed); $pointer += $this->pointerBase; break; case 2: $packed = "\x00" . \chr($ctrlByte & 0x7) . $buffer; [, $pointer] = unpack('N', $packed); $pointer += $this->pointerBase + 2048; break; case 3: $packed = \chr($ctrlByte & 0x7) . $buffer; // It is safe to use 'N' here, even on 32 bit machines as the // first bit is 0. [, $pointer] = unpack('N', $packed); $pointer += $this->pointerBase + 526336; break; case 4: // We cannot use unpack here as we might overflow on 32 bit // machines $pointerOffset = $this->decodeUint($buffer, $pointerSize); $pointerBase = $this->pointerBase; if (\PHP_INT_MAX - $pointerBase >= $pointerOffset) { $pointer = $pointerOffset + $pointerBase; } else { throw new RuntimeException( 'The database offset is too large to be represented on your platform.' ); } break; default: throw new InvalidDatabaseException( 'Unexpected pointer size ' . $pointerSize ); } return [$pointer, $offset]; } // @phpstan-ignore-next-line private function decodeUint(string $bytes, int $byteLength) { if ($byteLength === 0) { return 0; } $integer = 0; // PHP integers are signed. PHP_INT_SIZE - 1 is the number of // complete bytes that can be converted to an integer. However, // we can convert another byte if the leading bit is zero. $useRealInts = $byteLength <= \PHP_INT_SIZE - 1 \|\| ($byteLength === \PHP_INT_SIZE && (\ord($bytes[0]) & 0x80) === 0); for ($i = 0; $i < $byteLength; ++$i) { $part = \ord($bytes[$i]); // We only use gmp or bcmath if the final value is too big if ($useRealInts) { $integer = ($integer << 8) + $part; } elseif (\extension_loaded('gmp')) { $integer = gmp_strval(gmp_add(gmp_mul((string) $integer, '256'), $part)); } elseif (\extension_loaded('bcmath')) { $integer = bcadd(bcmul((string) $integer, '256'), (string) $part); } else { throw new RuntimeException( 'The gmp or bcmath extension must be installed to read this database.' ); } } return $integer; } private function sizeFromCtrlByte(int $ctrlByte, int $offset): array { $size = $ctrlByte & 0x1F; if ($size < 29) { return [$size, $offset]; } $bytesToRead = $size - 28; $bytes = Util::read($this->fileStream, $offset, $bytesToRead); if ($size === 29) { $size = 29 + \ord($bytes); } elseif ($size === 30) { [, $adjust] = unpack('n', $bytes); $size = 285 + $adjust; } else { [, $adjust] = unpack('N', "\x00" . $bytes); $size = $adjust + 65821; } return [$size, $offset + $bytesToRead]; } private function maybeSwitchByteOrder(string $bytes): string { return $this->switchByteOrder ? strrev($bytes) : $bytes; } private function isPlatformLittleEndian(): bool { $testint = 0x00FF; $packed = pack('S', $testint); return $testint === current(unpack('v', $packed)); } } ��Reader/InvalidDatabaseException.php��0000644��00000000332�15152604275�0013356 0��ustar�00��<?php declare(strict_types=1); namespace MaxMind\Db\Reader; use Exception; /* * This class should be thrown when unexpected data is found in the database. / class InvalidDatabaseException extends Exception { } ��Reader/Util.php��0000644��00000001454�15152604275�0007407 0��ustar�00��<?php declare(strict_types=1); namespace MaxMind\Db\Reader; class Util { /* * @param resource $stream / public static function read($stream, int $offset, int $numberOfBytes): string { if ($numberOfBytes === 0) { return ''; } if (fseek($stream, $offset) === 0) { $value = fread($stream, $numberOfBytes); // We check that the number of bytes read is equal to the number // asked for. We use ftell as getting the length of $value is // much slower. if ($value !== false && ftell($stream) - $offset === $numberOfBytes) { return $value; } } throw new InvalidDatabaseException( 'The MaxMind DB file contains bad data' ); } } ��Reader/Metadata.php��0000644��00000006256�15152604275�0010217 0��ustar�00��<?php declare(strict_types=1); namespace MaxMind\Db\Reader; use ArgumentCountError; /* * This class provides the metadata for the MaxMind DB file. / class Metadata { /* * This is an unsigned 16-bit integer indicating the major version number * for the database's binary format. * * @var int / public $binaryFormatMajorVersion; /* * This is an unsigned 16-bit integer indicating the minor version number * for the database's binary format. * * @var int / public $binaryFormatMinorVersion; /* * This is an unsigned 64-bit integer that contains the database build * timestamp as a Unix epoch value. * * @var int / public $buildEpoch; /* * This is a string that indicates the structure of each data record * associated with an IP address. The actual definition of these * structures is left up to the database creator. * * @var string / public $databaseType; /* * This key will always point to a map (associative array). The keys of * that map will be language codes, and the values will be a description * in that language as a UTF-8 string. May be undefined for some * databases. * * @var array / public $description; /* * This is an unsigned 16-bit integer which is always 4 or 6. It indicates * whether the database contains IPv4 or IPv6 address data. * * @var int / public $ipVersion; /* * An array of strings, each of which is a language code. A given record * may contain data items that have been localized to some or all of * these languages. This may be undefined. * * @var array / public $languages; /* * @var int / public $nodeByteSize; /* * This is an unsigned 32-bit integer indicating the number of nodes in * the search tree. * * @var int / public $nodeCount; /* * This is an unsigned 16-bit integer. It indicates the number of bits in a * record in the search tree. Note that each node consists of two records. * * @var int / public $recordSize; /* * @var int / public $searchTreeSize; public function __construct(array $metadata) { if (\func_num_args() !== 1) { throw new ArgumentCountError( sprintf('%s() expects exactly 1 parameter, %d given', __METHOD__, \func_num_args()) ); } $this->binaryFormatMajorVersion = $metadata['binary_format_major_version']; $this->binaryFormatMinorVersion = $metadata['binary_format_minor_version']; $this->buildEpoch = $metadata['build_epoch']; $this->databaseType = $metadata['database_type']; $this->languages = $metadata['languages']; $this->description = $metadata['description']; $this->ipVersion = $metadata['ip_version']; $this->nodeCount = $metadata['node_count']; $this->recordSize = $metadata['record_size']; $this->nodeByteSize = $this->recordSize / 4; $this->searchTreeSize = $this->nodeCount $this->nodeByteSize; } } ��

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