106 lines
2.0 KiB
Go
106 lines
2.0 KiB
Go
package mysql
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import (
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"bytes"
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"encoding/binary"
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"io"
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"strings"
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osm "git.loafle.net/overflow/service_matcher-go"
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)
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type MySqlMatcher struct {
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osm.Matchers
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}
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func (m *MySqlMatcher) Key() string {
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return "MYSQL"
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}
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func (m *MySqlMatcher) Name(matchCtx *osm.MatchCtx) string {
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name := "MySQL"
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if v, ok := matchCtx.GetAttribute("version"); ok {
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if strings.Contains(v.(string), "MariaDB") {
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name = "MariaDB"
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}
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name = name + " (" + v.(string) + ")"
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}
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return name
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}
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func (m *MySqlMatcher) IsPrePacket(matchCtx *osm.MatchCtx) bool {
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return true
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}
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func (m *MySqlMatcher) HasResponse(matchCtx *osm.MatchCtx, index int) bool {
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return true
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}
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func (m *MySqlMatcher) IsError(matchCtx *osm.MatchCtx, index int, packet *osm.Packet) bool {
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return false
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}
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type serverSettings struct {
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protocol byte
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version string
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flags uint32
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charset uint8
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scrambleBuff []byte
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threadID uint32
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keepalive int64
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}
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func (m *MySqlMatcher) 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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buf := bytes.NewBuffer(packet.Buffer[:3])
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packetLen, _ := binary.ReadUvarint(buf)
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if packetLen != uint64(packet.Len-4) {
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return osm.NotMatchedError()
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}
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pos := 4
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p := new(serverSettings)
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p.protocol = packet.Buffer[pos]
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if p.protocol != 9 && p.protocol != 10 {
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return osm.NotMatchedError()
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}
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pos++
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slice, err := readSlice(packet.Buffer[pos:], 0x00)
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if err != nil {
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return osm.NotMatchedError()
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}
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matchCtx.SetAttribute("version", string(slice))
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pos += len(slice) + 1
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p.threadID = bytesToUint32(packet.Buffer[pos : pos+4])
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pos += 4
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return nil
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}
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func readSlice(data []byte, delim byte) (slice []byte, e error) {
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pos := bytes.IndexByte(data, delim)
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if pos > -1 {
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slice = data[:pos]
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} else {
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slice = data
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e = io.EOF
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}
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return
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}
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func bytesToUint32(b []byte) (n uint32) {
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for i := uint8(0); i < 4; i++ {
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n |= uint32(b[i]) << (i * 8)
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}
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return
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}
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func NewMatcher() osm.Matcher {
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m := &MySqlMatcher{}
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return m
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}
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