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This commit is contained in:
bad 2021-10-01 22:18:48 +02:00
parent e9612e2430
commit 35879183be
15 changed files with 606 additions and 461 deletions
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26
main.go
View file

@ -7,6 +7,7 @@ import (
"runtime/debug"
"badat.dev/maeqtt/v2/mqtt/packets"
"badat.dev/maeqtt/v2/session"
)
func main() {
@ -27,7 +28,7 @@ func main() {
}
func handleConnection(con net.Conn) {
defer handlePanic()
defer handlePanic(con)
reader := bufio.NewReader(con)
@ -38,20 +39,33 @@ func handleConnection(con net.Conn) {
}
connect, isConn := (*packet).(packets.ConnectPacket)
if !isConn {
log.Println("Didn't recieve a connet packet")
panic("TODO: Send a disconnect packet")
log.Println("Didn't recieve a connect packet")
err := packets.DisconnectPacket{
ReasonCode: packets.DisconnectReasonCodeProtocolError,
}.Write(con)
if err != nil {
log.Println("Failed to disconnect after not recieving a connect packet", err)
}
return
}
conn := NewConnection(connect, con)
conn := session.NewConnection(connect, con)
sess := session.NewSession(&conn, connect)
sess := NewSession(&conn, connect)
sess.HandlerLoop()
}
func handlePanic() {
func handlePanic(con net.Conn) {
if r := recover(); r != nil {
log.Println("Recovering from panic:", r)
log.Println("Stack Trace:")
debug.PrintStack()
err := packets.DisconnectPacket{
ReasonCode: packets.DisconnectReasonCodeImplErorr,
}.Write(con)
if err != nil {
log.Println("Failed to send a disconnect packet after recovering from panic", err)
}
}
}

366
mqtt/GeneratedProperties.go
View file

@ -1,6 +1,6 @@
package mqtt
// This code has been generated with the genProps.py script. Do not modify
// This code has been generated with the genProps.py script. Do not modify
import "bufio"
@ -21,7 +21,6 @@ func (p *PayloadFormatIndicator) parse(r *bufio.Reader) error {
return nil
}
type MessageExpiryInterval struct {
value *uint32
}
@ -39,7 +38,6 @@ func (p *MessageExpiryInterval) parse(r *bufio.Reader) error {
return nil
}
type ContentType struct {
value *string
}
@ -57,7 +55,6 @@ func (p *ContentType) parse(r *bufio.Reader) error {
return nil
}
type ResponseTopic struct {
value *string
}
@ -75,7 +72,6 @@ func (p *ResponseTopic) parse(r *bufio.Reader) error {
return nil
}
type CorrelationData struct {
value *[]byte
}
@ -93,7 +89,6 @@ func (p *CorrelationData) parse(r *bufio.Reader) error {
return nil
}
type SubscriptionIdentifier struct {
value *int
}
@ -111,7 +106,6 @@ func (p *SubscriptionIdentifier) parse(r *bufio.Reader) error {
return nil
}
type SessionExpiryInterval struct {
value *uint32
}
@ -129,7 +123,6 @@ func (p *SessionExpiryInterval) parse(r *bufio.Reader) error {
return nil
}
type AssignedClientIdentifier struct {
value *string
}
@ -147,7 +140,6 @@ func (p *AssignedClientIdentifier) parse(r *bufio.Reader) error {
return nil
}
type ServerKeepAlive struct {
value *uint16
}
@ -165,7 +157,6 @@ func (p *ServerKeepAlive) parse(r *bufio.Reader) error {
return nil
}
type AuthenticationMethod struct {
value *string
}
@ -183,7 +174,6 @@ func (p *AuthenticationMethod) parse(r *bufio.Reader) error {
return nil
}
type AuthenticationData struct {
value *[]byte
}
@ -201,7 +191,6 @@ func (p *AuthenticationData) parse(r *bufio.Reader) error {
return nil
}
type RequestProblemInformation struct {
value *byte
}
@ -219,7 +208,6 @@ func (p *RequestProblemInformation) parse(r *bufio.Reader) error {
return nil
}
type WillDelayInterval struct {
value *uint32
}
@ -237,7 +225,6 @@ func (p *WillDelayInterval) parse(r *bufio.Reader) error {
return nil
}
type RequestResponseInformation struct {
value *byte
}
@ -255,7 +242,6 @@ func (p *RequestResponseInformation) parse(r *bufio.Reader) error {
return nil
}
type ResponseInformation struct {
value *string
}
@ -273,7 +259,6 @@ func (p *ResponseInformation) parse(r *bufio.Reader) error {
return nil
}
type ServerReference struct {
value *string
}
@ -291,7 +276,6 @@ func (p *ServerReference) parse(r *bufio.Reader) error {
return nil
}
type ReasonString struct {
value *string
}
@ -309,7 +293,6 @@ func (p *ReasonString) parse(r *bufio.Reader) error {
return nil
}
type ReceiveMaximum struct {
value *uint16
}
@ -327,7 +310,6 @@ func (p *ReceiveMaximum) parse(r *bufio.Reader) error {
return nil
}
type TopicAliasMaximum struct {
value *uint16
}
@ -345,7 +327,6 @@ func (p *TopicAliasMaximum) parse(r *bufio.Reader) error {
return nil
}
type TopicAlias struct {
value *uint16
}
@ -363,7 +344,6 @@ func (p *TopicAlias) parse(r *bufio.Reader) error {
return nil
}
type MaximumQoS struct {
value *byte
}
@ -381,7 +361,6 @@ func (p *MaximumQoS) parse(r *bufio.Reader) error {
return nil
}
type RetainAvailable struct {
value *byte
}
@ -399,7 +378,6 @@ func (p *RetainAvailable) parse(r *bufio.Reader) error {
return nil
}
type MaximumPacketSize struct {
value *uint32
}
@ -417,7 +395,6 @@ func (p *MaximumPacketSize) parse(r *bufio.Reader) error {
return nil
}
type WildcardSubscriptionAvailable struct {
value *byte
}
@ -435,7 +412,6 @@ func (p *WildcardSubscriptionAvailable) parse(r *bufio.Reader) error {
return nil
}
type SubscriptionIdentifierAvailable struct {
value *byte
}
@ -453,7 +429,6 @@ func (p *SubscriptionIdentifierAvailable) parse(r *bufio.Reader) error {
return nil
}
type SharedSubscriptionAvailable struct {
value *byte
}
@ -472,214 +447,241 @@ func (p *SharedSubscriptionAvailable) parse(r *bufio.Reader) error {
}
type PublishPacketProperties struct {
PayloadFormatIndicator PayloadFormatIndicator
MessageExpiryInterval MessageExpiryInterval
ContentType ContentType
ResponseTopic ResponseTopic
CorrelationData CorrelationData
SubscriptionIdentifier SubscriptionIdentifier
TopicAlias TopicAlias
UserProperty UserProperty
PayloadFormatIndicator PayloadFormatIndicator
MessageExpiryInterval MessageExpiryInterval
ContentType ContentType
ResponseTopic ResponseTopic
CorrelationData CorrelationData
SubscriptionIdentifier SubscriptionIdentifier
TopicAlias TopicAlias
UserProperty UserProperty
}
func (p *PublishPacketProperties) arrayOf() []Property {
return []Property {
&p.PayloadFormatIndicator,
&p.MessageExpiryInterval,
&p.ContentType,
&p.ResponseTopic,
&p.CorrelationData,
&p.SubscriptionIdentifier,
&p.TopicAlias,
&p.UserProperty,
}
return []Property{
&p.PayloadFormatIndicator,
&p.MessageExpiryInterval,
&p.ContentType,
&p.ResponseTopic,
&p.CorrelationData,
&p.SubscriptionIdentifier,
&p.TopicAlias,
&p.UserProperty,
}
}
type WillProperties struct {
PayloadFormatIndicator PayloadFormatIndicator
MessageExpiryInterval MessageExpiryInterval
ContentType ContentType
ResponseTopic ResponseTopic
CorrelationData CorrelationData
WillDelayInterval WillDelayInterval
UserProperty UserProperty
PayloadFormatIndicator PayloadFormatIndicator
MessageExpiryInterval MessageExpiryInterval
ContentType ContentType
ResponseTopic ResponseTopic
CorrelationData CorrelationData
WillDelayInterval WillDelayInterval
UserProperty UserProperty
}
func (p *WillProperties) arrayOf() []Property {
return []Property {
&p.PayloadFormatIndicator,
&p.MessageExpiryInterval,
&p.ContentType,
&p.ResponseTopic,
&p.CorrelationData,
&p.WillDelayInterval,
&p.UserProperty,
}
return []Property{
&p.PayloadFormatIndicator,
&p.MessageExpiryInterval,
&p.ContentType,
&p.ResponseTopic,
&p.CorrelationData,
&p.WillDelayInterval,
&p.UserProperty,
}
}
type SubscribePacketProperties struct {
SubscriptionIdentifier SubscriptionIdentifier
UserProperty UserProperty
SubscriptionIdentifier SubscriptionIdentifier
UserProperty UserProperty
}
func (p *SubscribePacketProperties) arrayOf() []Property {
return []Property {
&p.SubscriptionIdentifier,
&p.UserProperty,
}
return []Property{
&p.SubscriptionIdentifier,
&p.UserProperty,
}
}
type ConnectPacketProperties struct {
SessionExpiryInterval SessionExpiryInterval
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
RequestProblemInformation RequestProblemInformation
RequestResponseInformation RequestResponseInformation
ReceiveMaximum ReceiveMaximum
TopicAliasMaximum TopicAliasMaximum
UserProperty UserProperty
MaximumPacketSize MaximumPacketSize
SessionExpiryInterval SessionExpiryInterval
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
RequestProblemInformation RequestProblemInformation
RequestResponseInformation RequestResponseInformation
ReceiveMaximum ReceiveMaximum
TopicAliasMaximum TopicAliasMaximum
UserProperty UserProperty
MaximumPacketSize MaximumPacketSize
}
func (p *ConnectPacketProperties) arrayOf() []Property {
return []Property {
&p.SessionExpiryInterval,
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.RequestProblemInformation,
&p.RequestResponseInformation,
&p.ReceiveMaximum,
&p.TopicAliasMaximum,
&p.UserProperty,
&p.MaximumPacketSize,
}
return []Property{
&p.SessionExpiryInterval,
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.RequestProblemInformation,
&p.RequestResponseInformation,
&p.ReceiveMaximum,
&p.TopicAliasMaximum,
&p.UserProperty,
&p.MaximumPacketSize,
}
}
type ConnackPacketProperties struct {
SessionExpiryInterval SessionExpiryInterval
AssignedClientIdentifier AssignedClientIdentifier
ServerKeepAlive ServerKeepAlive
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
ResponseInformation ResponseInformation
ServerReference ServerReference
ReasonString ReasonString
ReceiveMaximum ReceiveMaximum
TopicAliasMaximum TopicAliasMaximum
MaximumQoS MaximumQoS
RetainAvailable RetainAvailable
UserProperty UserProperty
MaximumPacketSize MaximumPacketSize
WildcardSubscriptionAvailable WildcardSubscriptionAvailable
SubscriptionIdentifierAvailable SubscriptionIdentifierAvailable
SharedSubscriptionAvailable SharedSubscriptionAvailable
SessionExpiryInterval SessionExpiryInterval
AssignedClientIdentifier AssignedClientIdentifier
ServerKeepAlive ServerKeepAlive
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
ResponseInformation ResponseInformation
ServerReference ServerReference
ReasonString ReasonString
ReceiveMaximum ReceiveMaximum
TopicAliasMaximum TopicAliasMaximum
MaximumQoS MaximumQoS
RetainAvailable RetainAvailable
UserProperty UserProperty
MaximumPacketSize MaximumPacketSize
WildcardSubscriptionAvailable WildcardSubscriptionAvailable
SubscriptionIdentifierAvailable SubscriptionIdentifierAvailable
SharedSubscriptionAvailable SharedSubscriptionAvailable
}
func (p *ConnackPacketProperties) arrayOf() []Property {
return []Property {
&p.SessionExpiryInterval,
&p.AssignedClientIdentifier,
&p.ServerKeepAlive,
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.ResponseInformation,
&p.ServerReference,
&p.ReasonString,
&p.ReceiveMaximum,
&p.TopicAliasMaximum,
&p.MaximumQoS,
&p.RetainAvailable,
&p.UserProperty,
&p.MaximumPacketSize,
&p.WildcardSubscriptionAvailable,
&p.SubscriptionIdentifierAvailable,
&p.SharedSubscriptionAvailable,
}
return []Property{
&p.SessionExpiryInterval,
&p.AssignedClientIdentifier,
&p.ServerKeepAlive,
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.ResponseInformation,
&p.ServerReference,
&p.ReasonString,
&p.ReceiveMaximum,
&p.TopicAliasMaximum,
&p.MaximumQoS,
&p.RetainAvailable,
&p.UserProperty,
&p.MaximumPacketSize,
&p.WildcardSubscriptionAvailable,
&p.SubscriptionIdentifierAvailable,
&p.SharedSubscriptionAvailable,
}
}
type DisconnectPacketProperties struct {
SessionExpiryInterval SessionExpiryInterval
ServerReference ServerReference
ReasonString ReasonString
UserProperty UserProperty
SessionExpiryInterval SessionExpiryInterval
ServerReference ServerReference
ReasonString ReasonString
UserProperty UserProperty
}
func (p *DisconnectPacketProperties) arrayOf() []Property {
return []Property {
&p.SessionExpiryInterval,
&p.ServerReference,
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.SessionExpiryInterval,
&p.ServerReference,
&p.ReasonString,
&p.UserProperty,
}
}
type AuthPacketProperties struct {
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
ReasonString ReasonString
UserProperty UserProperty
AuthenticationMethod AuthenticationMethod
AuthenticationData AuthenticationData
ReasonString ReasonString
UserProperty UserProperty
}
func (p *AuthPacketProperties) arrayOf() []Property {
return []Property {
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.AuthenticationMethod,
&p.AuthenticationData,
&p.ReasonString,
&p.UserProperty,
}
}
type PubackPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *PubackPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type PubrecPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *PubrecPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type PubrelPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *PubrelPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type PubcompPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *PubcompPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type SubackPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *SubackPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type UnsubackPacketProperties struct {
ReasonString ReasonString
UserProperty UserProperty
ReasonString ReasonString
UserProperty UserProperty
}
func (p *UnsubackPacketProperties) arrayOf() []Property {
return []Property {
&p.ReasonString,
&p.UserProperty,
}
return []Property{
&p.ReasonString,
&p.UserProperty,
}
}
type UnsubscribePacketProperties struct {
UserProperty UserProperty
UserProperty UserProperty
}
func (p *UnsubscribePacketProperties) arrayOf() []Property {
return []Property {
&p.UserProperty,
}
return []Property{
&p.UserProperty,
}
}

7
mqtt/packets/Disconnect.go
View file

@ -60,9 +60,8 @@ func parseDisconnectPacket(control controlPacket) (DisconnectPacket, error) {
r := bufio.NewReader(control.reader)
// If there is less then a byte in the reader assume the reason code == 0
reason,err := r.ReadByte()
reason, err := r.ReadByte()
if err == io.EOF {
reason = 0
} else if err != nil {
@ -73,7 +72,7 @@ func parseDisconnectPacket(control controlPacket) (DisconnectPacket, error) {
// If there are less than 2 bytes remaining in the reader assume that the packet has no properties
_, err = r.Peek(2)
if err == nil {
err = properties.ParseProperties(r,packet.Properties.ArrayOf())
err = properties.ParseProperties(r, packet.Properties.ArrayOf())
} else if err != io.EOF {
return packet, err
} else if err == io.EOF {
@ -91,7 +90,7 @@ func (p DisconnectPacket) Write(w io.Writer) error {
return err
}
control := controlPacket {
control := controlPacket{
packetType: PacketTypeDisconnect,
flags: 0,
reader: buf,

7
mqtt/packets/Ping.go
View file

@ -6,8 +6,7 @@ import (
"io"
)
type PingreqPacket struct {}
type PingreqPacket struct{}
func parsePingreq(control controlPacket) (PingreqPacket, error) {
packet := PingreqPacket{}
@ -26,10 +25,10 @@ func (r PingreqPacket) Visit(p PacketVisitor) {
p.VisitPing(r)
}
type PingrespPacket struct {}
type PingrespPacket struct{}
func (p PingrespPacket) Write(w io.Writer) error {
control := controlPacket {
control := controlPacket{
packetType: PacketTypePingresp,
flags: 0,
reader: bytes.NewReader([]byte{}),

3
mqtt/packets/PubAckRecRel.go
View file

@ -1,11 +1,10 @@
package packets
import (
"io"
"badat.dev/maeqtt/v2/mqtt/properties"
"io"
)
type PubackReasonCode byte
const (

156
mqtt/packets/Subscriptions.go
View file

@ -2,6 +2,7 @@ package packets
import (
"bufio"
"bytes"
"errors"
"io"
"strings"
@ -15,7 +16,8 @@ type Topic struct {
}
var multiLevelWildcardNotLast = errors.New("Multi level wildcard isn't the field in a topic")
func parseTopic(topic_name string) (Topic, error) {
func ParseTopic(topic_name string) (Topic, error) {
topic := Topic{}
fields := strings.Split(topic_name, "/")
for i, field := range fields {
@ -45,7 +47,7 @@ func parseTopicFilter(r *bufio.Reader) (TopicFilter, error) {
return filter, err
}
filter.Topic, err = parseTopic(topic_str)
filter.Topic, err = ParseTopic(topic_str)
if err != nil {
return filter, err
}
@ -61,27 +63,32 @@ func parseTopicFilter(r *bufio.Reader) (TopicFilter, error) {
return filter, nil
}
// Both sub and unsubscribe packets are identitcal so we can reuse the parsing logic
type SubscriptionPacket struct {
type SubscribePacket struct {
PacketId uint16
TopicFilters []TopicFilter
Properties properties.SubscribePacketProperties
}
func parseSubscriptionPacket(control controlPacket, props []properties.Property) (SubscriptionPacket, error) {
var err error
func parseSubscribePacket(control controlPacket) (SubscribePacket, error) {
if control.packetType != PacketTypeSubscribe {
panic("Wrong packet type for parseSubscribePacket")
}
packet := SubscribePacket{}
r := bufio.NewReader(control.reader)
packet := SubscriptionPacket{}
if control.flags != 2 {
return packet, errors.New("Malformed subscription packet")
}
var err error
packet.PacketId, err = types.DecodeUint16(r)
if err != nil {
return packet, err
}
err = properties.ParseProperties(r, props)
err = properties.ParseProperties(r, packet.Properties.ArrayOf())
if err != nil {
return packet, err
}
@ -100,33 +107,10 @@ func parseSubscriptionPacket(control controlPacket, props []properties.Property)
return packet, nil
}
}
println("A")
return packet, nil
}
type SubscribePacket struct {
*SubscriptionPacket
props properties.SubscribePacketProperties
}
/// CURRENTLY BROKEN
// TODO FIXME AAAAA
func parseSubscribePacket(control controlPacket) (SubscribePacket, error) {
if control.packetType != PacketTypeSubscribe {
panic("Wrong packet type for parseSubscribePacket")
}
pack := SubscribePacket{}
subscriptionPack, err := parseSubscriptionPacket(control, pack.props.ArrayOf())
if err != nil {
return pack, err
}
pack.SubscriptionPacket = &subscriptionPack
return pack, nil
}
func (p SubscribePacket) Visit(v PacketVisitor) {
v.VisitSubscribe(p)
}
@ -143,9 +127,9 @@ const (
SubackReasonTopicFilterInvalid = 143
SubackReasonPacketIDInUse = 145
SubackReasonQuotaExceeded = 151
SubackReasonSharedSubNotSupported = 151
SubackReasonSubIDUnsupported = 151
SubackReasonWildcardSubUnsupported = 151
SubackReasonSharedSubNotSupported = 158
SubackReasonSubIDUnsupported = 161
SubackReasonWildcardSubUnsupported = 162
)
type SubAckPacket struct {
@ -154,20 +138,35 @@ type SubAckPacket struct {
Reason SubackReasonCode
}
func (p SubAckPacket) Write(w io.Writer) error {
resp := pubRespPacket{
PacketType: PacketTypeSuback,
PacketID: p.PacketID,
Properties: p.Properties.ArrayOf(),
Reason: byte(p.Reason),
buf := bytes.NewBuffer([]byte{})
err := types.WriteUint16(buf, p.PacketID)
if err != nil {
return err
}
return resp.Write(w)
err = properties.WriteProps(buf, p.Properties.ArrayOf())
if err != nil {
return err
}
err = buf.WriteByte(byte(p.Reason))
if err != nil {
return err
}
conPack := controlPacket{
packetType: PacketTypeSuback,
flags: 0,
reader: buf,
}
return conPack.write(w)
}
type UnsubscribePacket struct {
*SubscriptionPacket
props properties.UnsubscribePacketProperties
PacketID uint16
Topics []Topic
Properties properties.UnsubscribePacketProperties
}
func parseUnsubscribePacket(control controlPacket) (UnsubscribePacket, error) {
@ -175,14 +174,41 @@ func parseUnsubscribePacket(control controlPacket) (UnsubscribePacket, error) {
panic("Wrong packet type for parseSubscribePacket")
}
pack := UnsubscribePacket{}
subscriptionPack, err := parseSubscriptionPacket(control, pack.props.ArrayOf())
if err != nil {
return pack, err
packet := UnsubscribePacket{}
r := bufio.NewReader(control.reader)
if control.flags != 2 {
return packet, errors.New("Malformed subscription packet")
}
pack.PacketId = subscriptionPack.PacketId
pack.TopicFilters = subscriptionPack.TopicFilters
return pack, nil
var err error
packet.PacketID, err = types.DecodeUint16(r)
if err != nil {
return packet, err
}
err = properties.ParseProperties(r, packet.Properties.ArrayOf())
if err != nil {
return packet, err
}
for err != io.EOF {
topic_str, err := types.DecodeUTF8String(r)
if err != nil && err != io.EOF {
return packet, err
} else if err == io.EOF {
return packet, nil
}
filter, err := ParseTopic(topic_str)
if err != nil {
return packet, err
}
packet.Topics = append(packet.Topics, filter)
}
return packet, nil
}
func (p UnsubscribePacket) Visit(v PacketVisitor) {
@ -192,7 +218,7 @@ func (p UnsubscribePacket) Visit(v PacketVisitor) {
type UnsubackReasonCode byte
const (
UnsubackReasonSuccess PubackReasonCode = 0
UnsubackReasonSuccess UnsubackReasonCode = 0
UnSubackReasonUnspecified = 128
UnSubackReasonImplSpecificError = 131
UnSubackReasonNotAuthorized = 135
@ -206,13 +232,27 @@ type UnsubAckPacket struct {
Reason UnsubackReasonCode
}
func (p UnsubAckPacket) Write(w io.Writer) error {
resp := pubRespPacket{
PacketType: PacketTypeUnsuback,
PacketID: p.PacketID,
Properties: p.Properties.ArrayOf(),
Reason: byte(p.Reason),
buf := bytes.NewBuffer([]byte{})
err := types.WriteUint16(buf, p.PacketID)
if err != nil {
return err
}
return resp.Write(w)
err = properties.WriteProps(buf, p.Properties.ArrayOf())
if err != nil {
return err
}
err = buf.WriteByte(byte(p.Reason))
if err != nil {
return err
}
conPack := controlPacket{
packetType: PacketTypeUnsuback,
flags: 0,
reader: buf,
}
return conPack.write(w)
}

2
mqtt/packets/ack.go
View file

@ -34,7 +34,7 @@ func (p pubRespPacket) Write(w io.Writer) error {
}
conPack := controlPacket{
packetType: PacketTypePuback,
packetType: p.PacketType,
flags: 0,
reader: buf,
}

1
mqtt/types/Decoding.go
View file

@ -57,7 +57,6 @@ func DecodeBinaryData(r *bufio.Reader) ([]byte, error) {
return buffer, err
}
func DecodeUTF8String(r *bufio.Reader) (string, error) {
binary, err := DecodeBinaryData(r)
return string(binary[:]), err

4
mqtt/types/Encoding.go
View file

@ -29,8 +29,8 @@ func WriteUint32(w io.Writer, v uint32) error {
return err
}
const uint32Max uint32 = ^uint32(0)
func WriteDataWithVarIntLen(w io.Writer, data []byte) error {
if len(data) > int(uint32Max) {
return errors.New("Tried to write more data than max varint size")
@ -46,6 +46,7 @@ func WriteDataWithVarIntLen(w io.Writer, data []byte) error {
}
const uint16Max uint16 = ^uint16(0)
func WriteBinaryData(w io.Writer, data []byte) error {
if len(data) > int(uint16Max) {
return errors.New("Tried to write more data than max uint16 size")
@ -64,7 +65,6 @@ func WriteUTF8String(w io.Writer, str string) error {
return WriteBinaryData(w, []byte(str))
}
func WriteVariableByteInt(w io.Writer, v uint32) error {
for {
encodedByte := byte(v % 128)

2
connection.go → session/connection.go
View file

@ -1,4 +1,4 @@
package main
package session
import (
"bufio"

90
session.go → session/session.go
View file

@ -1,13 +1,15 @@
package main
package session
import (
"encoding/base64"
"fmt"
"io"
"log"
"math/rand"
"time"
"badat.dev/maeqtt/v2/mqtt/packets"
"badat.dev/maeqtt/v2/subscription"
)
func init() {
@ -25,8 +27,10 @@ type Session struct {
Connection *Connection
SubscriptionChannel chan packets.PublishPacket
ExpiryInterval time.Duration
ExpiryInterval time.Duration // TODO
expireTimer time.Timer // TODO
freePacketID uint16
}
func NewSession(conn *Connection, p packets.ConnectPacket) Session {
@ -39,8 +43,7 @@ func NewSession(conn *Connection, p packets.ConnectPacket) Session {
func (s *Session) Connect(conn *Connection, p packets.ConnectPacket) {
if s.Connection != nil {
//TODO
panic("Disconnect if already have a connection, unimplemented")
s.Disconnect(packets.DisconnectReasonCodeSessionTakenOver)
}
connAck := packets.ConnackPacket{}
@ -60,7 +63,6 @@ func (s *Session) Connect(conn *Connection, p packets.ConnectPacket) {
connAck.Properties.RetainAvailable.Value = &false
connAck.Properties.SharedSubscriptionAvailable.Value = &false
s.Connection = conn
err := s.Connection.sendPacket(connAck)
if err != nil {
@ -75,7 +77,7 @@ func (s *Session) HandlerLoop() {
case packet := <-s.Connection.PacketChannel:
packet.Visit(s)
case _ = <-s.Connection.ClientDisconnectedChan:
s.OnDisconnect()
s.onDisconnect()
case subMessage := <-s.SubscriptionChannel:
//TODO, log for now
log.Printf("Recieved subscription message, handling UNIMPLEMENTED, message: %v", subMessage)
@ -83,22 +85,29 @@ func (s *Session) HandlerLoop() {
}
}
func (s *Session) Disconnect() error {
panic("Disconnection unimplemented")
func (s *Session) Disconnect(code packets.DisconnectReasonCode) error {
s.Connection.sendPacket(packets.DisconnectPacket{
ReasonCode: code,
})
err := s.Connection.close()
if err != nil {
return err
}
s.OnDisconnect()
s.onDisconnect()
return nil
}
func (s *Session) OnDisconnect() {
func (s *Session) onDisconnect() {
s.Connection = nil
s.resetExpireTimer()
log.Printf("Client disconnected, id: %s", *s.ClientID)
}
func (s *Session) expireSession() {
subscription.Subscriptions.RemoveSubsForChannel(s.SubscriptionChannel)
}
// newTime is nullable
func (s *Session) updateExpireTimer(newTime *uint32) {
var expiry = uint32(0)
@ -129,35 +138,67 @@ func genClientID() *string {
}
func (s *Session) VisitConnect(_ packets.ConnectPacket) {
// ERROR CANNOT RECIEVE CONNECT ON AN ALREADY OPEN CONNECTION
s.Disconnect()
// Disconnect, we handle the connect packet in Connect,
// this means that we have an estabilished connection already
log.Println("WARN: Got a connect packet on an already estabilished connection")
s.Disconnect(packets.DisconnectReasonCodeProtocolError)
}
func (s *Session) VisitPublish(p packets.PublishPacket) {
println("UNIMPLEMENTED, Publishing packet, message:", string(p.Payload))
subs, lock := Subscriptions.GetSubscriptions(p.TopicName)
subs, lock := subscription.Subscriptions.GetSubscriptions(p.TopicName)
defer lock.Unlock()
if p.QOSLevel == 0 {
if p.PacketId != nil {
log.Printf("Client: %v, Got publish with qos 0 and a packet id, ignoring\n", s.ClientID)
return
}
} else if p.QOSLevel == 1 {
var reason packets.PubackReasonCode = packets.PubackReasonCodeSuccess
if len(subs) == 0 {
reason = packets.PubackReasonCodeNoMatchingSubscribers
}
ack := packets.PubackPacket{
PacketID: *p.PacketId,
Reason: reason,
}
s.Connection.sendPacket(ack)
} else if p.QOSLevel == 2 {
panic("UNIMPLEMENTED QOS level 2")
}
for _, sub := range subs {
go func(sub Subscription) {sub <- p}(sub)
if !(sub.NoLocal && sub.SubscriptionChannel == s.SubscriptionChannel) {
go func(sub subscription.Subscription) { sub.SubscriptionChannel <- p }(sub)
}
}
}
func (s *Session) VisitDisconnect(p packets.DisconnectPacket) {
//TODO FINISH
// HANDLE CLIENT DISCONNECTING
s.OnDisconnect()
err := s.Connection.close()
if err != nil && err != io.ErrClosedPipe {
log.Println("Error closing connection", err)
}
s.onDisconnect()
}
func (s *Session) VisitSubscribe(p packets.SubscribePacket) {
//TODO FINISH
for _, filter := range p.TopicFilters {
Subscriptions.Subscribe(filter.Topic, s.SubscriptionChannel)
subscription.Subscriptions.Subscribe(filter, s.SubscriptionChannel)
}
s.Connection.sendPacket(packets.SubAckPacket{
PacketID: p.PacketId,
Reason: packets.SubackReasonGrantedQoSTwo,
})
}
func (s *Session) VisitUnsubscribe(_ packets.UnsubscribePacket) {
panic("not implemented") // TODO: Implement
func (s *Session) VisitUnsubscribe(p packets.UnsubscribePacket) {
for _, topic := range p.Topics {
subscription.Subscriptions.Unsubscribe(topic, s.SubscriptionChannel)
}
s.Connection.sendPacket(packets.UnsubAckPacket{
PacketID: p.PacketID,
Reason: packets.UnsubackReasonSuccess,
})
}
func (s *Session) VisitPing(p packets.PingreqPacket) {
@ -179,3 +220,8 @@ func (s *Session) VisitPubrelPacket(_ packets.PubrelPacket) {
func (s *Session) VisitPubcompPacket(_ packets.PubcompPacket) {
panic("not implemented") // TODO: Implement
}
func (s *Session) getFreePacketId() uint16 {
s.freePacketID += 1
return s.freePacketID
}

86
subscription.go
View file

@ -1,86 +0,0 @@
package main
//TODO FULLY IMPLEMENT SUBSCRIPTIONS INSTEAD OF JUST THE TOPIC FILTERS
import (
"strings"
"sync"
"badat.dev/maeqtt/v2/mqtt/packets"
)
var Subscriptions SubscriptionTreeNode = *NewSubscriptionTreeNode()
type Subscription chan packets.PublishPacket
type SubscriptionTreeNode struct {
subscriptions []Subscription
children map[string]*SubscriptionTreeNode
nodeLock sync.RWMutex
}
func NewSubscriptionTreeNode() *SubscriptionTreeNode {
s := SubscriptionTreeNode{}
s.children = make(map[string]*SubscriptionTreeNode)
return &s
}
func (s *SubscriptionTreeNode) findNode(fields []string) *SubscriptionTreeNode {
if len(fields) == 0 {
return s
}
field := fields[0]
s.nodeLock.RLock()
_, exists := s.children[field]
// Insert a value into the map if one doesn't exist yet
if !exists {
// Can't upgrade a read lock so we need to unlock and
// check again, this time with a write lock
s.nodeLock.RUnlock()
s.nodeLock.Lock()
_, exists = s.children[field]
if !exists {
s.children[field] = NewSubscriptionTreeNode()
}
s.nodeLock.Unlock()
s.nodeLock.RLock()
}
child, _ := s.children[field]
s.nodeLock.RUnlock()
return child.findNode(fields[1:])
}
func (s *SubscriptionTreeNode) Subscribe(topic packets.Topic, sub Subscription) {
node := s.findNode(topic.Fields)
node.nodeLock.Lock()
node.subscriptions = append(node.subscriptions, sub)
node.nodeLock.Unlock()
}
func (s *SubscriptionTreeNode) GetSubscriptions(topic string) ([]Subscription, sync.Locker) {
fields := strings.Split(topic,"/")
child := s.findNode(fields)
locker := child.nodeLock.RLocker()
locker.Lock()
return child.subscriptions, locker
}
func (s *SubscriptionTreeNode) findMatchingRec(topic []string) ([]Subscription, sync.Locker) {
locker := s.nodeLock.RLocker()
s.nodeLock.RLock()
if len(topic) == 0 {
return s.subscriptions,locker
}
defer s.nodeLock.RUnlock()
child, exists := s.children[topic[0]]
if exists {
return child.findMatchingRec(topic[1:])
} else {
return []Subscription{},locker
}
}

106
subscription/subscription.go Normal file
View file

@ -0,0 +1,106 @@
package subscription
//TODO WILDCARD SUBSCRIPTIONS
import (
"strings"
"sync"
"badat.dev/maeqtt/v2/mqtt/packets"
)
var Subscriptions SubscriptionTreeNode = *newSubscriptionTreeNode()
type SubscriptionChannel chan packets.PublishPacket
type Subscription struct {
SubscriptionChannel
packets.TopicFilter
}
type SubscriptionTreeNode struct {
subscriptions []Subscription
children map[string]*SubscriptionTreeNode
nodeLock sync.RWMutex
}
func newSubscriptionTreeNode() *SubscriptionTreeNode {
s := SubscriptionTreeNode{}
s.children = make(map[string]*SubscriptionTreeNode)
return &s
}
func (s *SubscriptionTreeNode) findNode(fields []string) *SubscriptionTreeNode {
if len(fields) == 0 {
return s
}
field := fields[0]
s.nodeLock.RLock()
_, exists := s.children[field]
// Insert a value into the map if one doesn't exist yet
if !exists {
// Can't upgrade a read lock so we need to unlock and
// check again, this time with a write lock
s.nodeLock.RUnlock()
s.nodeLock.Lock()
_, exists = s.children[field]
if !exists {
s.children[field] = newSubscriptionTreeNode()
}
s.nodeLock.Unlock()
s.nodeLock.RLock()
}
child, _ := s.children[field]
s.nodeLock.RUnlock()
return child.findNode(fields[1:])
}
func (s *SubscriptionTreeNode) removeSubscription(subChan SubscriptionChannel) {
for i, sub := range s.subscriptions {
if sub.SubscriptionChannel == subChan {
lst := len(s.subscriptions) - 1
s.subscriptions[i] = s.subscriptions[lst]
s.subscriptions = s.subscriptions[:lst]
}
}
}
func (s *SubscriptionTreeNode) Subscribe(topicFilter packets.TopicFilter, subChan SubscriptionChannel) {
sub := Subscription{subChan, topicFilter}
node := s.findNode(topicFilter.Topic.Fields)
node.nodeLock.Lock()
node.subscriptions = append(node.subscriptions, sub)
node.nodeLock.Unlock()
}
func (s *SubscriptionTreeNode) Unsubscribe(topic packets.Topic, subChan SubscriptionChannel) {
node := s.findNode(topic.Fields)
node.nodeLock.Lock()
node.removeSubscription(subChan)
node.nodeLock.Unlock()
}
func (s *SubscriptionTreeNode) RemoveSubsForChannel(subChan SubscriptionChannel) {
for _, node := range s.children {
node.nodeLock.Lock()
node.removeSubscription(subChan)
node.nodeLock.Unlock()
node.RemoveSubsForChannel(subChan)
}
}
func (s *SubscriptionTreeNode) GetSubscriptions(topicName string) ([]Subscription, sync.Locker) {
fields := strings.Split(topicName, "/")
child := s.findNode(fields)
locker := child.nodeLock.RLocker()
locker.Lock()
return child.subscriptions, locker
}

27
subscription/subscription_test.go Normal file
View file

@ -0,0 +1,27 @@
package subscription
import (
"testing"
"badat.dev/maeqtt/v2/mqtt/packets"
)
func TestSubscribe(t *testing.T) {
tree := newSubscriptionTreeNode()
topic, _ := packets.ParseTopic("a/b/c")
channel := make(SubscriptionChannel)
topicFilter := packets.TopicFilter{
Topic: topic,
MaxQoS: 1,
}
tree.Subscribe(topicFilter, channel)
subs, lock := tree.GetSubscriptions("a/b/c")
defer lock.Unlock()
if len(subs) != 1 {
t.Errorf("Error storing subscriptions, expected to len(subs) to be 1, got: %v \n", len(subs))
}
if subs[0].MaxQoS != topicFilter.MaxQoS || subs[0].SubscriptionChannel != channel {
t.Error("Error with data stored in a subscription")
}
}