Exemple #1
0
func (t *transport) handleSkipSuccessor(ch *e3x.Channel) {
	var (
		err    error
		stream io.ReadWriteCloser
		req    struct {
			Target string
			Self   *completeVnode
		}
	)

	defer ch.Close()

	stream = newStream(ch)

	err = json.NewDecoder(stream).Decode(&req)
	if err != nil {
		// log
		// tracef("(SkipSuccessor) error: %s", err)
		return
	}

	rpc := t.lookupRPC(req.Target)
	if rpc == nil {
		// log
		// tracef("(SkipSuccessor) error: %s", "no RPC")
		return
	}

	err = rpc.SkipSuccessor(t.internalVnode(req.Self))
	if err != nil {
		// log
		// tracef("(SkipSuccessor) error: %s", err)
		return
	}
}
Exemple #2
0
func (t *transport) handleListVnodes(ch *e3x.Channel) {
	var (
		err error
		res []*completeVnode
	)

	defer ch.Close()

	_, err = ch.ReadPacket()
	if err != nil {
		// log error
		// tracef("error: %s", err)
		return
	}

	for _, rpc := range t.localVnodes {
		res = append(res, t.completeVnode(rpc.vn))
	}

	err = json.NewEncoder(newStream(ch)).Encode(&res)
	if err != nil {
		// log error
		// tracef("error: %s", err)
		return
	}

	// tracef("handle.ListVnodes() => %s", res)
}
Exemple #3
0
// Gets a list of the vnodes on the box
func (t *transport) ListVnodes(hn string) ([]*chord.Vnode, error) {
	var (
		addr *e3x.Addr
		ch   *e3x.Channel
		res  []*completeVnode
		err  error
	)

	addr = t.lookupAddr(hashname.H(hn))
	if addr == nil {
		return nil, e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.list", true)
	if err != nil {
		return nil, err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	err = ch.WritePacket(&lob.Packet{})
	if err != nil {
		return nil, err
	}

	err = json.NewDecoder(newStream(ch)).Decode(&res)
	if err != nil {
		return nil, err
	}

	return t.internalVnodes(res), nil
}
Exemple #4
0
// Find a successor
func (t *transport) FindSuccessors(vn *chord.Vnode, n int, k []byte) ([]*chord.Vnode, error) {
	var (
		addr   *e3x.Addr
		ch     *e3x.Channel
		stream io.ReadWriteCloser
		res    []*completeVnode
		err    error

		req = struct {
			Target string
			N      int
			K      []byte
		}{vn.String(), n, k}
	)

	// tracef("FindSuccessors(target:Vnode(%q))", vn.String())

	addr = t.lookupAddr(hashname.H(vn.Host))
	if addr == nil {
		return nil, e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.successors.find", true)
	if err != nil {
		return nil, err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	stream = newStream(ch)

	err = json.NewEncoder(stream).Encode(&req)
	if err != nil {
		// tracef("(FindSuccessors) error: %s", err)
		return nil, err
	}

	err = json.NewDecoder(stream).Decode(&res)
	if err != nil {
		// tracef("(FindSuccessors) error: %s", err)
		return nil, err
	}

	return t.internalVnodes(res), nil
}
Exemple #5
0
func (t *transport) handleNotify(ch *e3x.Channel) {
	var (
		err    error
		stream io.ReadWriteCloser
		req    struct {
			Target string
			Self   *completeVnode
		}
		vnodes []*chord.Vnode
		res    []*completeVnode
	)

	defer ch.Close()

	stream = newStream(ch)

	err = json.NewDecoder(stream).Decode(&req)
	if err != nil {
		// log
		// tracef("(Notify) error: %s", err)
		return
	}

	rpc := t.lookupRPC(req.Target)
	if rpc == nil {
		// log
		// tracef("(Notify) error: %s", "no RPC")
		return
	}

	vnodes, err = rpc.Notify(t.internalVnode(req.Self))
	if err != nil {
		// log
		// tracef("(Notify) error: %s", err)
		return
	}

	res = t.completeVnodes(vnodes)

	err = json.NewEncoder(stream).Encode(&res)
	if err != nil {
		// log
		// tracef("(Notify) error: %s", err)
		return
	}

	// tracef("handle.Notify(target:Vnode(%q), self:Vnode(%q)) => []Vnode(%v)", req.Target, req.Self.Id, res)
}
func (rt *RoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
	var (
		hashname = hashname.H(req.URL.Host)
		c        *e3x.Channel
		resp     *http.Response
		err      error
	)

	x := rt.Endpoint.GetExchange(hashname)
	if x == nil {
		return nil, e3x.UnreachableEndpointError(hashname)
	}

	c, err = x.Open("thtp", true)
	if err != nil {
		c.Close()
		return nil, err
	}

	err = rt.writeRequest(req, c)
	if err != nil {
		c.Close()
		return nil, err
	}

	resp, err = rt.readResponse(c)
	if err != nil {
		c.Close()
		return nil, err
	}

	resp.Request = req
	return resp, nil
}
Exemple #7
0
func (t *transport) handleGetPredecessor(ch *e3x.Channel) {
	var (
		err   error
		pkt   *lob.Packet
		id    string
		vnode *chord.Vnode
		res   *completeVnode
	)

	defer ch.Close()

	pkt, err = ch.ReadPacket()
	if err != nil {
		// log error
		// tracef("error: %s", err)
		return
	}

	id, _ = pkt.Header().GetString("vn")
	rpc := t.lookupRPC(id)
	if rpc == nil {
		// log
		// tracef("error: %s", "no RPC")
		return
	}

	vnode, err = rpc.GetPredecessor()
	if err != nil {
		// log
		// tracef("error: %s", err)
		return
	}

	res = t.completeVnode(vnode)
	err = json.NewEncoder(newStream(ch)).Encode(&res)
	if err != nil {
		// log
		// tracef("error: %s", err)
		return
	}

	if res != nil {
		// tracef("handle.GetPredecessor(Vnode(%q)) => Vnode(%q)", id, res.Id)
	}
}
Exemple #8
0
// Notify our successor of ourselves
func (t *transport) Notify(target, self *chord.Vnode) ([]*chord.Vnode, error) {
	var (
		addr   *e3x.Addr
		ch     *e3x.Channel
		stream io.ReadWriteCloser
		res    []*completeVnode
		err    error

		req = struct {
			Target string
			Self   *completeVnode
		}{target.String(), t.completeVnode(self)}
	)

	addr = t.lookupAddr(hashname.H(target.Host))
	if addr == nil {
		return nil, e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.notify", true)
	if err != nil {
		return nil, err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	stream = newStream(ch)

	err = json.NewEncoder(stream).Encode(&req)
	if err != nil {
		return nil, err
	}

	err = json.NewDecoder(stream).Decode(&res)
	if err != nil {
		return nil, err
	}

	// tracef("Notify(target:Vnode(%q), self:Vnode(%q)) => []Vnode(%v)", target.String(), self.String(), res)
	return t.internalVnodes(res), nil
}
Exemple #9
0
// Request a nodes predecessor
func (t *transport) GetPredecessor(vn *chord.Vnode) (*chord.Vnode, error) {
	var (
		addr *e3x.Addr
		ch   *e3x.Channel
		pkt  *lob.Packet
		res  *completeVnode
		err  error
	)

	addr = t.lookupAddr(hashname.H(vn.Host))
	if addr == nil {
		return nil, e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.predecessor.get", true)
	if err != nil {
		return nil, err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	pkt = &lob.Packet{}
	pkt.Header().SetString("vn", vn.String())
	err = ch.WritePacket(pkt)
	if err != nil {
		return nil, err
	}

	err = json.NewDecoder(newStream(ch)).Decode(&res)
	if err != nil {
		return nil, err
	}

	if res != nil {
		// tracef("GetPredecessor(Vnode(%q)) => Vnode(%q)", vn.String(), res.Id)
	}
	return t.internalVnode(res), nil
}
Exemple #10
0
func (t *transport) handleFindSuccessors(ch *e3x.Channel) {
	var (
		err    error
		stream io.ReadWriteCloser
		req    struct {
			Target string
			N      int
			K      []byte
		}
		res []*chord.Vnode
	)

	defer ch.Close()

	stream = newStream(ch)

	err = json.NewDecoder(stream).Decode(&req)
	if err != nil {
		// log
		// tracef("(FindSuccessors) error: %s", err)
		return
	}

	rpc := t.lookupRPC(req.Target)
	if rpc != nil {
		res, err = rpc.FindSuccessors(req.N, req.K)
		if err != nil {
			// log
			// tracef("(FindSuccessors) error: %s", err)
			return
		}
	}

	err = json.NewEncoder(stream).Encode(t.completeVnodes(res))
	if err != nil {
		// log
		// tracef("(FindSuccessors) error: %s", err)
		return
	}
}
Exemple #11
0
func (t *transport) handlePing(ch *e3x.Channel) {
	var (
		err   error
		pkt   *lob.Packet
		id    string
		alive bool
	)

	defer ch.Close()

	pkt, err = ch.ReadPacket()
	if err != nil {
		// log error
		// tracef("error: %s", err)
		return
	}

	id, _ = pkt.Header().GetString("vn")
	rpc := t.lookupRPC(id)
	if rpc == nil {
		alive = false
	} else {
		alive = true
	}

	pkt = &lob.Packet{}
	pkt.Header().SetBool("alive", alive)
	err = ch.WritePacket(pkt)
	if err != nil {
		// log error
		// tracef("error: %s", err)
		return
	}
}
Exemple #12
0
func (mod *module) serveTelehash(c *e3x.Channel) {
	defer c.Close()

	defer func() {
		if err := recover(); err != nil {
			const size = 64 << 10
			buf := make([]byte, size)
			buf = buf[:runtime.Stack(buf, false)]
			mod.logf("thtp: panic serving %s: %v\n%s", c.RemoteHashname(), err, buf)
		}
	}()

	req, err := mod.readRequest(c)
	if err != nil {
		return
	}

	rw := newResponseWriter(c)
	defer rw.Flush()

	mod.handler.ServeHTTP(rw, req)
}
Exemple #13
0
func (mod *module) handlePathRequest(c *e3x.Channel) {
	defer c.Kill()

	pkt, err := c.ReadPacket()
	if err != nil {
		return // ignore
	}

	// decode paths known by peer and add them as candidates
	if header, found := pkt.Header().Get("paths"); found {
		data, err := json.Marshal(header)
		if err != nil {
			return // ignore
		}

		var entries []json.RawMessage
		err = json.Unmarshal(data, &entries)
		if err != nil {
			return // ignore
		}

		for _, entry := range entries {
			addr, err := transports.DecodeAddr(entry)
			if err != nil {
			}
			if err == nil {
				c.Exchange().AddPathCandidate(addr)
			}
		}
	}

	var pipes = c.Exchange().KnownPipes()

	for _, pipe := range pipes {
		pkt := &lob.Packet{}
		pkt.Header().Set("path", pipe.RemoteAddr())
		c.WritePacketTo(pkt, pipe)
	}
}
Exemple #14
0
// Instructs a node to skip a given successor. Used to leave.
func (t *transport) SkipSuccessor(target, self *chord.Vnode) error {
	var (
		addr   *e3x.Addr
		ch     *e3x.Channel
		stream io.ReadWriteCloser
		err    error

		req = struct {
			Target string
			Self   *completeVnode
		}{target.String(), t.completeVnode(self)}
	)

	addr = t.lookupAddr(hashname.H(target.Host))
	if addr == nil {
		return e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.successor.skip", true)
	if err != nil {
		return err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	stream = newStream(ch)

	err = json.NewEncoder(stream).Encode(&req)
	if err != nil {
		return err
	}

	return nil
}
Exemple #15
0
// Ping a Vnode, check for liveness
func (t *transport) Ping(vn *chord.Vnode) (bool, error) {
	var (
		addr  *e3x.Addr
		ch    *e3x.Channel
		pkt   *lob.Packet
		alive bool
		err   error
	)

	addr = t.lookupAddr(hashname.H(vn.Host))
	if addr == nil {
		return false, e3x.ErrNoAddress
	}

	ch, err = t.e.Open(addr, "chord.ping", true)
	if err != nil {
		return false, err
	}

	defer ch.Close()

	// ch.SetReadDeadline(time.Now().Add(30*time.Second))
	// ch.SetWriteDeadline(time.Now().Add(30*time.Second))

	pkt = &lob.Packet{}
	pkt.Header().SetString("vn", vn.String())
	err = ch.WritePacket(pkt)
	if err != nil {
		return false, err
	}

	pkt, err = ch.ReadPacket()
	if err != nil {
		return false, err
	}
	alive, _ = pkt.Header().GetBool("alive")
	// tracef("Ping(Vnode(%q)) => %v", vn.String(), alive)
	return alive, nil
}
Exemple #16
0
func (d *dht) handle_see(c *e3x.Channel) {
	defer c.Close()

	pkt, err := c.ReadPacket()
	if err != nil {
		return
	}

	key, ok := pkt.Header().GetString("key")
	if !ok {
		return
	}

	h := d.localLookup(key)

	pkt = &lob.Packet{}
	pkt.Header().Set("see", h)
	pkt.Header().SetBool("end", true)
	err = c.WritePacket(pkt)
	if err != nil {
		return
	}
}
func (mod *module) handle_connect(ch *e3x.Channel) {
	defer ch.Kill()

	var (
		from        hashname.H
		localIdent  *e3x.Identity
		remoteIdent *e3x.Identity
		handshake   cipherset.Handshake
		innerData   = bufpool.New()
		err         error
	)

	localIdent, err = mod.e.LocalIdentity()
	if err != nil {
		return
	}

	pkt, err := ch.ReadPacket()
	if err != nil {
		return
	}

	pkt.Body(innerData.SetLen(pkt.BodyLen()).RawBytes()[:0])

	inner, err := lob.Decode(innerData)
	if err != nil {
		return
	}

	innerHdr := inner.Header()
	if innerHdr.IsBinary() && len(innerHdr.Bytes) == 1 {
		// handshake
		var (
			csid = innerHdr.Bytes[0]
			key  = localIdent.Keys()[csid]
		)
		if key == nil {
			return
		}

		handshake, err = cipherset.DecryptHandshake(csid, key, inner.Body(nil))
		if err != nil {
			return
		}

		from, err = hashname.FromIntermediates(handshake.Parts())
		if err != nil {
			return
		}

		remoteIdent, err = e3x.NewIdentity(cipherset.Keys{
			handshake.CSID(): handshake.PublicKey(),
		}, handshake.Parts(), nil)
		if err != nil {
			return
		}

	} else {
		// key packet

		var parts = make(cipherset.Parts)
		var csid uint8
		for key, value := range inner.Header().Extra {
			if len(key) != 2 {
				continue
			}

			keyData, err := hex.DecodeString(key)
			if err != nil {
				continue
			}

			partCSID := keyData[0]
			switch v := value.(type) {
			case bool:
				csid = partCSID
			case string:
				parts[partCSID] = v
			}
		}

		hn, err := hashname.FromKeyAndIntermediates(csid, inner.Body(nil), parts)
		if err != nil {
			return
		}

		from = hn

		pubKey, err := cipherset.DecodeKeyBytes(csid, inner.Body(nil), nil)
		if err != nil {
			return
		}

		remoteIdent, err = e3x.NewIdentity(cipherset.Keys{csid: pubKey}, parts, nil)
		if err != nil {
			return
		}
	}

	if from == "" {
		return
	}

	if mod.config.AllowConnect != nil && !mod.config.AllowConnect(from, ch.RemoteHashname()) {
		return
	}

	x, err := mod.e.CreateExchange(remoteIdent)
	if err != nil {
		return
	}

	// when the BODY contains a handshake
	if handshake != nil {
		routerExchange := ch.Exchange()
		routerAddr := &peerAddr{
			router: routerExchange.RemoteHashname(),
		}

		conn := newConnection(x.RemoteHashname(), routerAddr, routerExchange, func() {
			mod.unregisterConnection(routerExchange, x.LocalToken())
		})

		pipe, added := x.AddPipeConnection(conn, nil)
		if added {
			mod.registerConnection(routerExchange, x.LocalToken(), conn)
		}

		resp, ok := x.ApplyHandshake(handshake, pipe)
		if !ok {
			return
		}

		if resp != nil {
			err = mod.peerVia(ch.Exchange(), from, resp)
			if err != nil {
				return
			}
		}
	}

	// when the BODY contains a key packet
	if handshake == nil {
		pkt, err := x.GenerateHandshake()
		if err != nil {
			return
		}

		err = mod.peerVia(ch.Exchange(), from, pkt)
		if err != nil {
			return
		}
	}

	// Notify on-exchange callbacks
	mod.getIntroduction(from).resolve(x, nil)
}
Exemple #18
0
func (mod *module) handle_peer(ch *e3x.Channel) {
	defer ch.Kill()

	log := mod.log.From(ch.RemoteHashname()).To(mod.e.LocalHashname())

	// MUST allow router role
	if mod.config.DisableRouter {
		log.Println("drop: router disabled")
		return
	}

	pkt, err := ch.ReadPacket()
	if err != nil {
		log.Printf("drop: failed to read packet: %s", err)
		return
	}

	peerStr, ok := pkt.Header().GetString("peer")
	if !ok {
		log.Printf("drop: no peer in packet")
		return
	}
	peer := hashname.H(peerStr)

	// MUST have link to either endpoint
	if mod.e.GetExchange(ch.RemoteHashname()) == nil && mod.e.GetExchange(peer) == nil {
		log.Printf("drop: no link to either peer")
		return
	}

	// MUST pass firewall
	if mod.config.AllowPeer != nil && !mod.config.AllowPeer(ch.RemoteHashname(), peer) {
		log.Printf("drop: blocked by firewall")
		return
	}

	ex := mod.e.GetExchange(peer)
	if ex == nil {
		log.Printf("drop: no exchange to target")
		// resolve?
		return
	}

	token := cipherset.ExtractToken(pkt.Body(nil))
	if token != cipherset.ZeroToken {
		// add bridge back to requester
		mod.RouteToken(token, ch.Exchange())
	}

	mod.connect(ex, bufpool.New().Set(pkt.Body(nil)))
}