107 lines
1.9 KiB
Go
107 lines
1.9 KiB
Go
package rmi
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import (
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"bytes"
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"encoding/binary"
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osm "git.loafle.net/overflow/service_matcher-go"
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)
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const (
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MAGIC_NUMBER = 0x4a524d49
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STREAM_PROTOCOL = 0x4b
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VERSION = 0x0002
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ACK_PROTOCOL = 0x4e
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)
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type RMI_SEND_MESSAGE struct {
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magic uint32
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version uint16
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protocol uint8
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}
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type RMI_RECV_MESSAGE struct {
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streamMessage uint8
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packetLen uint16
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host []byte
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port [2]byte
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}
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type RMIMatcher struct {
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osm.Matchers
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}
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func (r *RMIMatcher) Key() string {
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return "RMI"
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}
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func (r *RMIMatcher) Name() string {
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return "RMI"
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}
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func (r *RMIMatcher) Meta() osm.Metadata {
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return nil
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}
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func (r *RMIMatcher) IsPrePacket() bool {
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return false
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}
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func (r *RMIMatcher) HasResponse(index int) bool {
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return true
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}
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func (r *RMIMatcher) IsError(info osm.MatchInfo, index int, packet *osm.Packet) bool {
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return false
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}
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func (r *RMIMatcher) Match(info osm.MatchInfo, index int, packet *osm.Packet) error {
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if packet == nil || packet.Buffer == nil || packet.Len == 0 {
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return osm.NoPacketReceivedError()
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}
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rmiRecv := RMI_RECV_MESSAGE{}
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buf := bytes.NewReader(packet.Buffer)
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binary.Read(buf, binary.BigEndian, &rmiRecv.streamMessage)
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binary.Read(buf, binary.BigEndian, &rmiRecv.packetLen)
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lenInt := int(rmiRecv.packetLen)
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var tempHost = make([]byte, lenInt, lenInt)
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copy(rmiRecv.host, tempHost)
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rmiRecv.host = tempHost
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binary.Read(buf, binary.BigEndian, &rmiRecv.host)
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binary.Read(buf, binary.BigEndian, &rmiRecv.port)
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hostIp := string(rmiRecv.host[:lenInt])
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if rmiRecv.streamMessage == ACK_PROTOCOL && lenInt == len(hostIp) {
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return nil
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}
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return osm.NotMatchedError()
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}
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func NewMatcher() osm.Matcher {
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m := &RMIMatcher{}
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rsm := RMI_SEND_MESSAGE{
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magic: MAGIC_NUMBER,
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version: VERSION,
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protocol: STREAM_PROTOCOL,
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}
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mCache := new(bytes.Buffer)
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binary.Write(mCache, binary.BigEndian, rsm)
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sendByte := mCache.Bytes()
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m.AddPacket(osm.NewPacket(sendByte, len(sendByte)))
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return m
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}
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