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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"
"log"
"net"
"os"
"strings"
"github.com/matrix-org/gomatrixserverlib"
"github.com/neilalexander/utp"
ironwoodtypes "github.com/Arceliar/ironwood/types"
yggdrasilconfig "github.com/yggdrasil-network/yggdrasil-go/src/config"
yggdrasilcore "github.com/yggdrasil-network/yggdrasil-go/src/core"
yggdrasildefaults "github.com/yggdrasil-network/yggdrasil-go/src/defaults"
yggdrasilmulticast "github.com/yggdrasil-network/yggdrasil-go/src/multicast"
gologme "github.com/gologme/log"
)
type Node struct {
core *yggdrasilcore.Core
config *yggdrasilconfig.NodeConfig
multicast *yggdrasilmulticast.Multicast
log *gologme.Logger
utpSocket *utp.Socket
incoming chan net.Conn
}
func (n *Node) DialerContext(ctx context.Context, _, 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)
}
pk := make(ironwoodtypes.Addr, ed25519.PublicKeySize)
copy(pk, raw[:])
return n.utpSocket.DialAddrContext(ctx, pk)
}
func Setup(instanceName, storageDirectory, peerURI string) (*Node, error) {
n := &Node{
core: &yggdrasilcore.Core{},
config: yggdrasildefaults.GenerateConfig(),
multicast: &yggdrasilmulticast.Multicast{},
log: gologme.New(os.Stdout, "YGG ", log.Flags()),
incoming: make(chan net.Conn),
}
yggfile := fmt.Sprintf("%s/%s-yggdrasil.conf", storageDirectory, instanceName)
if _, err := os.Stat(yggfile); !os.IsNotExist(err) {
yggconf, e := os.ReadFile(yggfile)
if e != nil {
panic(err)
}
if err := json.Unmarshal([]byte(yggconf), &n.config); err != nil {
panic(err)
}
}
n.config.Peers = []string{}
if peerURI != "" {
n.config.Peers = append(n.config.Peers, peerURI)
}
n.config.AdminListen = "none"
j, err := json.MarshalIndent(n.config, "", " ")
if err != nil {
panic(err)
}
if e := os.WriteFile(yggfile, j, 0600); e != nil {
n.log.Printf("Couldn't write private key to file '%s': %s\n", yggfile, e)
}
n.log.EnableLevel("error")
n.log.EnableLevel("warn")
n.log.EnableLevel("info")
if err = n.core.Start(n.config, n.log); err != nil {
panic(err)
}
n.utpSocket, err = utp.NewSocketFromPacketConnNoClose(n.core)
if err != nil {
panic(err)
}
if err = n.multicast.Init(n.core, n.config, n.log, nil); err != nil {
panic(err)
}
if err = n.multicast.Start(); err != nil {
panic(err)
}
n.log.Println("Public key:", n.core.PublicKey())
go n.listenFromYgg()
return n, nil
}
func (n *Node) Stop() {
if err := n.multicast.Stop(); err != nil {
n.log.Println("Error stopping multicast:", err)
}
n.core.Stop()
}
func (n *Node) DerivedServerName() string {
return hex.EncodeToString(n.PublicKey())
}
func (n *Node) PrivateKey() ed25519.PrivateKey {
sk := make(ed25519.PrivateKey, ed25519.PrivateKeySize)
sb, err := hex.DecodeString(n.config.PrivateKey)
if err == nil {
copy(sk, sb[:])
} else {
panic(err)
}
return sk
}
func (n *Node) PublicKey() ed25519.PublicKey {
return n.core.PublicKey()
}
func (n *Node) PeerCount() int {
return len(n.core.GetPeers())
}
func (n *Node) KnownNodes() []gomatrixserverlib.ServerName {
nodemap := map[string]struct{}{}
for _, peer := range n.core.GetPeers() {
nodemap[hex.EncodeToString(peer.Key)] = struct{}{}
}
var nodes []gomatrixserverlib.ServerName
for node := range nodemap {
nodes = append(nodes, gomatrixserverlib.ServerName(node))
}
return nodes
}
func (n *Node) SetMulticastEnabled(enabled bool) {
// TODO: There's no dynamic reconfiguration in Yggdrasil v0.4
// so we need a solution for this.
}
func (n *Node) DisconnectMulticastPeers() {
// TODO: There's no dynamic reconfiguration in Yggdrasil v0.4
// so we need a solution for this.
}
func (n *Node) DisconnectNonMulticastPeers() {
// TODO: There's no dynamic reconfiguration in Yggdrasil v0.4
// so we need a solution for this.
}
func (n *Node) SetStaticPeer(uri string) error {
// TODO: There's no dynamic reconfiguration in Yggdrasil v0.4
// so we need a solution for this.
return nil
}
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