109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
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package maxminddb
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import "net"
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// Internal structure used to keep track of nodes we still need to visit.
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type netNode struct {
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ip net.IP
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bit uint
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pointer uint
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}
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// Networks represents a set of subnets that we are iterating over.
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type Networks struct {
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reader *Reader
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nodes []netNode // Nodes we still have to visit.
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lastNode netNode
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err error
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}
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// Networks returns an iterator that can be used to traverse all networks in
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// the database.
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//
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// Please note that a MaxMind DB may map IPv4 networks into several locations
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// in in an IPv6 database. This iterator will iterate over all of these
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// locations separately.
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func (r *Reader) Networks() *Networks {
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s := 4
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if r.Metadata.IPVersion == 6 {
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s = 16
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}
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return &Networks{
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reader: r,
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nodes: []netNode{
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{
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ip: make(net.IP, s),
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},
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},
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}
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}
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// Next prepares the next network for reading with the Network method. It
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// returns true if there is another network to be processed and false if there
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// are no more networks or if there is an error.
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func (n *Networks) Next() bool {
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for len(n.nodes) > 0 {
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node := n.nodes[len(n.nodes)-1]
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n.nodes = n.nodes[:len(n.nodes)-1]
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for {
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if node.pointer < n.reader.Metadata.NodeCount {
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ipRight := make(net.IP, len(node.ip))
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copy(ipRight, node.ip)
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if len(ipRight) <= int(node.bit>>3) {
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n.err = newInvalidDatabaseError(
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"invalid search tree at %v/%v", ipRight, node.bit)
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return false
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}
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ipRight[node.bit>>3] |= 1 << (7 - (node.bit % 8))
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rightPointer, err := n.reader.readNode(node.pointer, 1)
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if err != nil {
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n.err = err
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return false
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}
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node.bit++
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n.nodes = append(n.nodes, netNode{
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pointer: rightPointer,
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ip: ipRight,
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bit: node.bit,
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})
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node.pointer, err = n.reader.readNode(node.pointer, 0)
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if err != nil {
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n.err = err
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return false
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}
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} else if node.pointer > n.reader.Metadata.NodeCount {
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n.lastNode = node
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return true
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} else {
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break
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}
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}
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}
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return false
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}
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// Network returns the current network or an error if there is a problem
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// decoding the data for the network. It takes a pointer to a result value to
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// decode the network's data into.
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func (n *Networks) Network(result interface{}) (*net.IPNet, error) {
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if err := n.reader.retrieveData(n.lastNode.pointer, result); err != nil {
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return nil, err
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}
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return &net.IPNet{
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IP: n.lastNode.ip,
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Mask: net.CIDRMask(int(n.lastNode.bit), len(n.lastNode.ip)*8),
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}, nil
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}
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// Err returns an error, if any, that was encountered during iteration.
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func (n *Networks) Err() error {
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return n.err
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}
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