diff options
Diffstat (limited to '')
| -rw-r--r-- | vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php b/vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php new file mode 100644 index 0000000..85457c5 --- /dev/null +++ b/vendor/maxmind-db/reader/src/MaxMind/Db/Reader.php @@ -0,0 +1,327 @@ +<?php
+
+namespace MaxMind\Db;
+
+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
+{
+ private static $DATA_SECTION_SEPARATOR_SIZE = 16;
+ private static $METADATA_START_MARKER = "\xAB\xCD\xEFMaxMind.com";
+ private static $METADATA_START_MARKER_LENGTH = 14;
+ private static $METADATA_MAX_SIZE = 131072; // 128 * 1024 = 128KB
+
+ private $decoder;
+ private $fileHandle;
+ private $fileSize;
+ private $ipV4Start;
+ 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 $database
+ * the MaxMind DB file to use
+ *
+ * @throws InvalidArgumentException for invalid database path or unknown arguments
+ * @throws \MaxMind\Db\Reader\InvalidDatabaseException
+ * if the database is invalid or there is an error reading
+ * from it
+ */
+ public function __construct($database)
+ {
+ if (\func_num_args() !== 1) {
+ throw new InvalidArgumentException(
+ 'The constructor takes exactly one argument.'
+ );
+ }
+
+ if (!is_readable($database)) {
+ throw new InvalidArgumentException(
+ "The file \"$database\" does not exist or is not readable."
+ );
+ }
+ $this->fileHandle = @fopen($database, 'rb');
+ if ($this->fileHandle === false) {
+ throw new InvalidArgumentException(
+ "Error opening \"$database\"."
+ );
+ }
+ $this->fileSize = @filesize($database);
+ if ($this->fileSize === false) {
+ throw new UnexpectedValueException(
+ "Error determining the size of \"$database\"."
+ );
+ }
+
+ $start = $this->findMetadataStart($database);
+ $metadataDecoder = new Decoder($this->fileHandle, $start);
+ list($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 $ipAddress
+ * the IP address to look up
+ *
+ * @throws BadMethodCallException if this method is called on a closed database
+ * @throws InvalidArgumentException if something other than a single IP address is passed to the method
+ * @throws InvalidDatabaseException
+ * if the database is invalid or there is an error reading
+ * from it
+ *
+ * @return mixed the record for the IP address
+ */
+ public function get($ipAddress)
+ {
+ if (\func_num_args() !== 1) {
+ throw new InvalidArgumentException(
+ 'Method takes exactly one argument.'
+ );
+ }
+ list($record) = $this->getWithPrefixLen($ipAddress);
+
+ return $record;
+ }
+
+ /**
+ * Retrieves the record for the IP address and its associated network prefix length.
+ *
+ * @param string $ipAddress
+ * the IP address to look up
+ *
+ * @throws BadMethodCallException if this method is called on a closed database
+ * @throws InvalidArgumentException if something other than a single IP address is passed to the method
+ * @throws InvalidDatabaseException
+ * if the database is invalid or there is an error reading
+ * from it
+ *
+ * @return array an array where the first element is the record and the
+ * second the network prefix length for the record
+ */
+ public function getWithPrefixLen($ipAddress)
+ {
+ if (\func_num_args() !== 1) {
+ throw new InvalidArgumentException(
+ 'Method takes exactly one argument.'
+ );
+ }
+
+ if (!\is_resource($this->fileHandle)) {
+ throw new BadMethodCallException(
+ 'Attempt to read from a closed MaxMind DB.'
+ );
+ }
+
+ if (!filter_var($ipAddress, FILTER_VALIDATE_IP)) {
+ throw new InvalidArgumentException(
+ "The value \"$ipAddress\" is not a valid IP address."
+ );
+ }
+
+ list($pointer, $prefixLen) = $this->findAddressInTree($ipAddress);
+ if ($pointer === 0) {
+ return [null, $prefixLen];
+ }
+
+ return [$this->resolveDataPointer($pointer), $prefixLen];
+ }
+
+ private function findAddressInTree($ipAddress)
+ {
+ $rawAddress = unpack('C*', inet_pton($ipAddress));
+
+ $bitCount = \count($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, $i];
+ } elseif ($node > $nodeCount) {
+ // Record is a data pointer
+ return [$node, $i];
+ }
+ throw new InvalidDatabaseException('Something bad happened');
+ }
+
+ private function ipV4StartNode()
+ {
+ // If we have an IPv4 database, the start node is the first node
+ if ($this->metadata->ipVersion === 4) {
+ return 0;
+ }
+
+ $node = 0;
+
+ for ($i = 0; $i < 96 && $node < $this->metadata->nodeCount; ++$i) {
+ $node = $this->readNode($node, 0);
+ }
+
+ return $node;
+ }
+
+ private function readNode($nodeNumber, $index)
+ {
+ $baseOffset = $nodeNumber * $this->metadata->nodeByteSize;
+
+ switch ($this->metadata->recordSize) {
+ case 24:
+ $bytes = Util::read($this->fileHandle, $baseOffset + $index * 3, 3);
+ list(, $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]);
+ }
+ list(, $node) = unpack('N', \chr($middle) . substr($bytes, $index, 3));
+
+ return $node;
+ case 32:
+ $bytes = Util::read($this->fileHandle, $baseOffset + $index * 4, 4);
+ list(, $node) = unpack('N', $bytes);
+
+ return $node;
+ default:
+ throw new InvalidDatabaseException(
+ 'Unknown record size: '
+ . $this->metadata->recordSize
+ );
+ }
+ }
+
+ private function resolveDataPointer($pointer)
+ {
+ $resolved = $pointer - $this->metadata->nodeCount
+ + $this->metadata->searchTreeSize;
+ if ($resolved >= $this->fileSize) {
+ throw new InvalidDatabaseException(
+ "The MaxMind DB file's search tree is corrupt"
+ );
+ }
+
+ list($data) = $this->decoder->decode($resolved);
+
+ return $data;
+ }
+
+ /*
+ * This is an extremely naive but reasonably readable implementation. There
+ * are much faster algorithms (e.g., Boyer-Moore) for this if speed is ever
+ * an issue, but I suspect it won't be.
+ */
+ private function findMetadataStart($filename)
+ {
+ $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()
+ {
+ if (\func_num_args()) {
+ throw new InvalidArgumentException(
+ 'Method takes no arguments.'
+ );
+ }
+
+ // 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 $this->metadata;
+ }
+
+ /**
+ * Closes the MaxMind DB and returns resources to the system.
+ *
+ * @throws Exception
+ * if an I/O error occurs
+ */
+ public function close()
+ {
+ if (!\is_resource($this->fileHandle)) {
+ throw new BadMethodCallException(
+ 'Attempt to close a closed MaxMind DB.'
+ );
+ }
+ fclose($this->fileHandle);
+ }
+}
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