ricochet-go/core/protocol.go

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package core
import (
"encoding/asn1"
protocol "github.com/s-rah/go-ricochet"
"log"
"net"
"time"
)
type Protocol struct {
core *Ricochet
service *protocol.Ricochet
handler *protocolHandler
}
// Implements protocol.RicochetService
type protocolHandler struct {
p *Protocol
}
func CreateProtocol(core *Ricochet) *Protocol {
p := &Protocol{
core: core,
service: new(protocol.Ricochet),
}
p.handler = &protocolHandler{p: p}
p.service.Init()
return p
}
func (p *Protocol) ServeListener(listener net.Listener) {
p.service.ServeListener(p.handler, listener)
}
// Strangely, ServeListener starts a background routine that watches a channel
// on p.service for new connections and dispatches their events to the handler
// for the listener. API needs a little work here.
func (p *Protocol) ConnectOpen(conn net.Conn, host string) (*protocol.OpenConnection, error) {
oc, err := p.service.ConnectOpen(conn, host)
if err != nil {
return nil, err
}
oc.MyHostname = p.core.Identity.Address()[9:]
return oc, nil
}
func (handler *protocolHandler) OnReady() {
log.Printf("protocol: OnReady")
}
func (handler *protocolHandler) OnConnect(oc *protocol.OpenConnection) {
log.Printf("protocol: OnConnect: %v", oc)
if oc.Client {
log.Printf("Connected to %s", oc.OtherHostname)
oc.IsAuthed = true // Outbound connections are authenticated
oc.Authenticate(1)
} else {
// Strip ricochet:
oc.MyHostname = handler.p.core.Identity.Address()[9:]
}
}
func (handler *protocolHandler) OnDisconnect(oc *protocol.OpenConnection) {
log.Printf("protocol: OnDisconnect: %v", oc)
if oc.OtherHostname != "" {
contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
if contact != nil {
contact.OnConnectionClosed(oc)
}
}
}
// Authentication Management
func (handler *protocolHandler) OnAuthenticationRequest(oc *protocol.OpenConnection, channelID int32, clientCookie [16]byte) {
log.Printf("protocol: OnAuthenticationRequest")
oc.ConfirmAuthChannel(channelID, clientCookie)
}
func (handler *protocolHandler) OnAuthenticationChallenge(oc *protocol.OpenConnection, channelID int32, serverCookie [16]byte) {
log.Printf("protocol: OnAuthenticationChallenge")
privateKey := handler.p.core.Identity.PrivateKey()
publicKeyBytes, _ := asn1.Marshal(privateKey.PublicKey)
oc.SendProof(1, serverCookie, publicKeyBytes, &privateKey)
}
func (handler *protocolHandler) OnAuthenticationProof(oc *protocol.OpenConnection, channelID int32, publicKey []byte, signature []byte, isKnownContact bool) {
result := oc.ValidateProof(channelID, publicKey, signature)
var contact *Contact
if result {
if len(oc.OtherHostname) != 16 {
log.Printf("protocol: Invalid format for hostname '%s' in authentication proof", oc.OtherHostname)
result = false
} else {
contact = handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
}
}
isKnownContact = (contact != nil)
oc.SendAuthenticationResult(channelID, result, isKnownContact)
oc.IsAuthed = result
oc.CloseChannel(channelID)
log.Printf("protocol: OnAuthenticationProof, result: %v, contact: %v", result, contact)
if result && contact != nil {
contact.OnConnectionAuthenticated(oc)
}
}
func (handler *protocolHandler) OnAuthenticationResult(oc *protocol.OpenConnection, channelID int32, result bool, isKnownContact bool) {
oc.IsAuthed = result
oc.CloseChannel(channelID)
if !result {
log.Printf("protocol: Outbound connection authentication to %s failed", oc.OtherHostname)
oc.Close()
return
}
// XXX Contact request, removed cases
if !isKnownContact {
log.Printf("protocol: Outbound connection authentication to %s succeeded, but we are not a known contact", oc.OtherHostname)
oc.Close()
return
}
contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
if contact == nil {
log.Printf("protocol: Outbound connection authenticated to %s succeeded, but no matching contact found", oc.OtherHostname)
oc.Close()
return
}
log.Printf("protocol: Outbound connection to %s authenticated", oc.OtherHostname)
contact.OnConnectionAuthenticated(oc)
}
// Contact Management
func (handler *protocolHandler) IsKnownContact(hostname string) bool {
contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + hostname)
return contact != nil
}
func (handler *protocolHandler) OnContactRequest(oc *protocol.OpenConnection, channelID int32, nick string, message string) {
}
func (handler *protocolHandler) OnContactRequestAck(oc *protocol.OpenConnection, channelID int32, status string) {
}
// Managing Channels
func (handler *protocolHandler) OnOpenChannelRequest(oc *protocol.OpenConnection, channelID int32, channelType string) {
log.Printf("open channel request: %v %v", channelID, channelType)
oc.AckOpenChannel(channelID, channelType)
}
func (handler *protocolHandler) OnOpenChannelRequestSuccess(oc *protocol.OpenConnection, channelID int32) {
log.Printf("open channel request success: %v %v", channelID)
}
func (handler *protocolHandler) OnChannelClosed(oc *protocol.OpenConnection, channelID int32) {
log.Printf("channel closed: %v", channelID)
}
// Chat Messages
// XXX messageID should be (at least) uint32
func (handler *protocolHandler) OnChatMessage(oc *protocol.OpenConnection, channelID int32, messageID int32, message string) {
// XXX no time delta?
// XXX sanity checks, message contents, etc
log.Printf("chat message: %d %d %s", channelID, messageID, message)
// XXX ugllly
contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
if contact != nil {
conversation := contact.Conversation()
conversation.Receive(uint64(messageID), time.Now().Unix(), message)
}
oc.AckChatMessage(channelID, messageID)
}
func (handler *protocolHandler) OnChatMessageAck(oc *protocol.OpenConnection, channelID int32, messageID int32) {
// XXX no success
log.Printf("chat ack: %d %d", channelID, messageID)
// XXX Also ugly
contact := handler.p.core.Identity.ContactList().ContactByAddress("ricochet:" + oc.OtherHostname)
if contact != nil {
conversation := contact.Conversation()
conversation.UpdateSentStatus(uint64(messageID), true)
}
}
// Handle Errors
func (handler *protocolHandler) OnFailedChannelOpen(oc *protocol.OpenConnection, channelID int32, errorType string) {
log.Printf("failed channel open: %d %s", channelID, errorType)
oc.UnsetChannel(channelID)
}
func (handler *protocolHandler) OnGenericError(oc *protocol.OpenConnection, channelID int32) {
oc.RejectOpenChannel(channelID, "GenericError")
}
func (handler *protocolHandler) OnUnknownTypeError(oc *protocol.OpenConnection, channelID int32) {
oc.RejectOpenChannel(channelID, "UnknownTypeError")
}
func (handler *protocolHandler) OnUnauthorizedError(oc *protocol.OpenConnection, channelID int32) {
oc.RejectOpenChannel(channelID, "UnauthorizedError")
}
func (handler *protocolHandler) OnBadUsageError(oc *protocol.OpenConnection, channelID int32) {
oc.RejectOpenChannel(channelID, "BadUsageError")
}
func (handler *protocolHandler) OnFailedError(oc *protocol.OpenConnection, channelID int32) {
oc.RejectOpenChannel(channelID, "FailedError")
}