110 lines
2.1 KiB
Go
110 lines
2.1 KiB
Go
package nbss
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import (
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"bytes"
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"encoding/binary"
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csm "git.loafle.net/commons/service_matcher-go"
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)
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const (
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NBSS_SESSION_REQUEST uint8 = 0x81
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NBSS_POSITIVE_SESSION_RESPONSE uint8 = 0x82
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NBSS_NEGATIVE_SESSION_RESPONSE uint8 = 0x83
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)
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type NBSS struct {
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MsgType uint8
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Flags uint8 //0-6 : Reserved, must be zero. 7 : Length extension.
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Length uint16
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CalledNameLen uint8
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CalledName [16]uint16
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_ uint8
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CallingNameLen uint8
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CallingName [16]uint16
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_ uint8
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}
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type NBSSMatcher struct {
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csm.Matchers
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}
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func (t *NBSSMatcher) Key() string {
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return "NBSS"
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}
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func (t *NBSSMatcher) Name() string {
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return "NBSS"
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}
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func (t *NBSSMatcher) Meta() csm.Metadata {
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return nil
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}
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func (t *NBSSMatcher) IsPrePacket() bool {
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return false
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}
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func (t *NBSSMatcher) HasResponse(index int) bool {
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return true
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}
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func (t *NBSSMatcher) IsError(info csm.MatchInfo, index int, packet *csm.Packet) bool {
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return false
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}
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func (t *NBSSMatcher) Match(info csm.MatchInfo, index int, packet *csm.Packet) error {
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if packet == nil || packet.Buffer == nil || packet.Len == 0 {
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return csm.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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n := NBSS{}
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if err := binary.Read(reader, binary.LittleEndian, &n); err != nil {
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return csm.NotMatchedError()
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}
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if NBSS_NEGATIVE_SESSION_RESPONSE != n.MsgType {
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return csm.NotMatchedError()
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}
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return nil
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}
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func NewMatcher() csm.Matcher {
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m := &NBSSMatcher{}
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tempBuf := new(bytes.Buffer)
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binary.Write(tempBuf, binary.BigEndian, NBSS{})
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query := NBSS{
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MsgType: NBSS_SESSION_REQUEST,
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Flags: 0x00,
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Length: 0x4400,
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CalledNameLen: 0x20,
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CallingNameLen: 0x20,
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}
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query.CalledName[0] = 0x4D45 // L
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query.CalledName[1] = 0x4745 // F
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query.CallingName[0] = 0x4D45
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query.CallingName[1] = 0x4745
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for i := 2; i < 16; i++ {
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query.CalledName[i] = 0x4143 //Space
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query.CallingName[i] = 0x4143
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}
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writer := new(bytes.Buffer)
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binary.Write(writer, binary.LittleEndian, query)
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m.AddPacket(csm.NewPacket(writer.Bytes(), writer.Len()))
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return m
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}
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