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// Copyright 2020 The Matrix.org Foundation C.I.C.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package yggconn
import (
"context"
"crypto/ed25519"
"encoding/hex"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net"
"os"
"strings"
"sync"
"github.com/matrix-org/dendrite/cmd/dendrite-demo-yggdrasil/convert"
"github.com/libp2p/go-yamux"
yggdrasiladmin "github.com/yggdrasil-network/yggdrasil-go/src/admin"
yggdrasilconfig "github.com/yggdrasil-network/yggdrasil-go/src/config"
yggdrasilmulticast "github.com/yggdrasil-network/yggdrasil-go/src/multicast"
"github.com/yggdrasil-network/yggdrasil-go/src/yggdrasil"
gologme "github.com/gologme/log"
)
type Node struct {
core *yggdrasil.Core
config *yggdrasilconfig.NodeConfig
state *yggdrasilconfig.NodeState
admin *yggdrasiladmin.AdminSocket
multicast *yggdrasilmulticast.Multicast
log *gologme.Logger
listener *yggdrasil.Listener
dialer *yggdrasil.Dialer
sessions sync.Map // string -> yamux.Session
incoming chan *yamux.Stream
}
func (n *Node) Dialer(_, address string) (net.Conn, error) {
tokens := strings.Split(address, ":")
raw, err := hex.DecodeString(tokens[0])
if err != nil {
return nil, fmt.Errorf("hex.DecodeString: %w", err)
}
converted := convert.Ed25519PublicKeyToCurve25519(ed25519.PublicKey(raw))
convhex := hex.EncodeToString(converted)
return n.Dial("curve25519", convhex)
}
func (n *Node) DialerContext(ctx context.Context, network, address string) (net.Conn, error) {
return n.Dialer(network, address)
}
// nolint:gocyclo
func Setup(instanceName, instancePeer string) (*Node, error) {
n := &Node{
core: &yggdrasil.Core{},
config: yggdrasilconfig.GenerateConfig(),
admin: &yggdrasiladmin.AdminSocket{},
multicast: &yggdrasilmulticast.Multicast{},
log: gologme.New(os.Stdout, "YGG ", log.Flags()),
incoming: make(chan *yamux.Stream),
}
yggfile := fmt.Sprintf("%s-yggdrasil.conf", instanceName)
if _, err := os.Stat(yggfile); !os.IsNotExist(err) {
yggconf, e := ioutil.ReadFile(yggfile)
if e != nil {
panic(err)
}
if err := json.Unmarshal([]byte(yggconf), &n.config); err != nil {
panic(err)
}
} else {
n.config.AdminListen = fmt.Sprintf("unix://./%s-yggdrasil.sock", instanceName)
n.config.MulticastInterfaces = []string{".*"}
n.config.EncryptionPrivateKey = hex.EncodeToString(n.EncryptionPrivateKey())
n.config.EncryptionPublicKey = hex.EncodeToString(n.EncryptionPublicKey())
j, err := json.MarshalIndent(n.config, "", " ")
if err != nil {
panic(err)
}
if e := ioutil.WriteFile(yggfile, j, 0600); e != nil {
n.log.Printf("Couldn't write private key to file '%s': %s\n", yggfile, e)
}
}
var err error
n.log.EnableLevel("error")
n.log.EnableLevel("warn")
n.log.EnableLevel("info")
n.state, err = n.core.Start(n.config, n.log)
if err != nil {
panic(err)
}
if instancePeer != "" {
if err = n.core.AddPeer(instancePeer, ""); err != nil {
panic(err)
}
}
if err = n.admin.Init(n.core, n.state, n.log, nil); err != nil {
panic(err)
}
if err = n.admin.Start(); err != nil {
panic(err)
}
if err = n.multicast.Init(n.core, n.state, n.log, nil); err != nil {
panic(err)
}
if err = n.multicast.Start(); err != nil {
panic(err)
}
n.admin.SetupAdminHandlers(n.admin)
n.multicast.SetupAdminHandlers(n.admin)
n.listener, err = n.core.ConnListen()
if err != nil {
panic(err)
}
n.dialer, err = n.core.ConnDialer()
if err != nil {
panic(err)
}
go n.listenFromYgg()
return n, nil
}
func (n *Node) DerivedServerName() string {
return hex.EncodeToString(n.SigningPublicKey())
}
func (n *Node) DerivedSessionName() string {
return hex.EncodeToString(n.EncryptionPublicKey())
}
func (n *Node) EncryptionPublicKey() []byte {
edkey := n.SigningPublicKey()
return convert.Ed25519PublicKeyToCurve25519(edkey)
}
func (n *Node) EncryptionPrivateKey() []byte {
edkey := n.SigningPrivateKey()
return convert.Ed25519PrivateKeyToCurve25519(edkey)
}
func (n *Node) SigningPublicKey() ed25519.PublicKey {
pubBytes, _ := hex.DecodeString(n.config.SigningPublicKey)
return ed25519.PublicKey(pubBytes)
}
func (n *Node) SigningPrivateKey() ed25519.PrivateKey {
privBytes, _ := hex.DecodeString(n.config.SigningPrivateKey)
return ed25519.PrivateKey(privBytes)
}
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