89 lines
1.6 KiB
Go
89 lines
1.6 KiB
Go
package cassandra
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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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type cassandra struct {
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Version uint8
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Flags uint8
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Stream uint16
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Opcode uint8
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Length uint32
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}
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type CassandraMatcher struct {
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osm.Matchers
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}
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func (m *CassandraMatcher) Key() string {
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return "CASSANDRA"
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}
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func (m *CassandraMatcher) Name(matchCtx *osm.MatchCtx) string {
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return "Cassandra"
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}
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func (m *CassandraMatcher) IsPrePacket(matchCtx *osm.MatchCtx) bool {
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return false
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}
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func (m *CassandraMatcher) HasResponse(matchCtx *osm.MatchCtx, index int) bool {
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return true
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}
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func (m *CassandraMatcher) IsError(matchCtx *osm.MatchCtx, index int, packet *osm.Packet) bool {
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return false
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}
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func (m *CassandraMatcher) Match(matchCtx *osm.MatchCtx, index int, packet *osm.Packet) error {
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if packet == nil || !packet.Valid() {
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return osm.NoPacketReceivedError()
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}
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reader := new(bytes.Buffer)
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reader.Write(packet.Buffer)
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c := cassandra{}
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if err := binary.Read(reader, binary.BigEndian, &c); err != nil {
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return err
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}
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if c.Version != 0x84 {
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return osm.NotMatchedError()
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}
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if c.Flags != 0x00 {
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return osm.NotMatchedError()
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}
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if c.Stream != 0x00 {
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return osm.NotMatchedError()
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}
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if c.Opcode != 0x06 {
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return osm.NotMatchedError()
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}
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return nil
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}
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func NewMatcher() osm.Matcher {
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m := &CassandraMatcher{}
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c := cassandra{
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Version: 4,
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Flags: 0,
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Stream: 0,
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Opcode: 5,
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Length: 0,
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}
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writer := new(bytes.Buffer)
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binary.Write(writer, binary.LittleEndian, c)
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m.AddPacket(osm.NewPacket(writer.Bytes(), writer.Len()))
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return m
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}
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