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broker.go
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broker.go
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package agent
import (
"errors"
"fmt"
"log"
"log/slog"
"runtime/debug"
"strings"
"github.com/devilcove/boltdb"
"github.com/devilcove/plexus"
"github.com/nats-io/nats-server/v2/server"
"github.com/nats-io/nats.go"
"github.com/nats-io/nkeys"
)
func startBroker() (*server.Server, *nats.EncodedConn) {
defer log.Println("Agent server halting")
ns, err := server.NewServer(&server.Options{Host: "localhost", Port: Config.NatsPort, NoSigs: true})
if err != nil {
slog.Error("start nats", "error", err)
panic(err)
}
ns.Start()
if !ns.ReadyForConnections(NatsTimeout) {
slog.Error("nats not ready for connections")
panic("not ready for connections")
}
slog.Info("nats server started")
nc, err := nats.Connect(ns.ClientURL())
if err != nil {
slog.Error("nats connect", "error", err)
return nil, nil
}
ec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
if err != nil {
slog.Error("nats encoder", "error", err)
return nil, nil
}
subcribe(ec)
return ns, ec
}
func subcribe(ec *nats.EncodedConn) {
_, _ = ec.Subscribe(Agent+plexus.Status, func(subject, reply string, data any) {
slog.Debug("status request received")
if err := ec.Publish(reply, processStatus()); err != nil {
slog.Error("publish status response", "err", err)
}
})
_, _ = ec.Subscribe(Agent+plexus.JoinNetwork, func(subj, reply string, data *plexus.JoinRequest) {
slog.Debug("join request")
if err := ec.Publish(reply, processJoin(data)); err != nil {
slog.Error("publish join response", "error", err)
}
})
_, _ = ec.Subscribe(Agent+plexus.LeaveNetwork, func(subj, reply string, data *plexus.LeaveRequest) {
slog.Debug("leave request")
if err := ec.Publish(reply, processLeave(data)); err != nil {
slog.Error("publish leave response", "error", err)
}
})
_, _ = ec.Subscribe(Agent+plexus.LeaveServer, func(subj, reply string, data *any) {
slog.Debug("leaveServer request")
if err := ec.Publish(reply, processLeaveServer()); err != nil {
slog.Error("publish leaveServer response", "error", err)
}
if err := ec.Publish(reply, plexus.MessageResponse{Message: "disconnected from server"}); err != nil {
slog.Error("publish reply", "error", err)
}
})
_, _ = ec.Subscribe(Agent+plexus.Register, func(sub, reply string, data *plexus.RegisterRequest) {
slog.Debug("register request")
resp := handleRegistration(data)
if err := ec.Publish(reply, resp); err != nil {
slog.Error("publish reply", "error", err)
}
})
_, _ = ec.Subscribe(Agent+plexus.LogLevel, func(level *plexus.LevelRequest) {
slog.Debug("loglevel request")
newLevel := strings.ToUpper(level.Level)
slog.Info("loglevel change", "level", newLevel)
plexus.SetLogging(newLevel)
})
_, _ = ec.Subscribe(Agent+plexus.Reload, func(sub, reply string, data *any) {
slog.Debug("reload request")
resp, err := processReload()
if err != nil {
if err := ec.Publish(reply, plexus.MessageResponse{Message: "error" + err.Error()}); err != nil {
slog.Error("publish reply", "error", err)
}
return
}
self, err := boltdb.Get[Device]("self", deviceTable)
if err != nil {
slog.Error("get device", "error", err)
if err := ec.Publish(reply, plexus.MessageResponse{Message: "error" + err.Error()}); err != nil {
slog.Error("pub reply to reload request", "error", err)
}
return
}
if err := ec.Publish(reply, resp); err != nil {
slog.Error("pub reply to reload request", "error", err)
}
deleteAllNetworks()
deleteAllInterfaces()
if err := saveServerNetworks(resp.Networks); err != nil {
slog.Error("save networks", "error", err)
}
startAllInterfaces(self)
//addNewNetworks(self, resp.Networks)
})
_, _ = ec.Subscribe(Agent+plexus.Reset, func(sub, reply string, request *plexus.ResetRequest) {
slog.Debug("reset request")
self, err := boltdb.Get[Device]("self", deviceTable)
if err != nil {
slog.Error(err.Error())
if err := ec.Publish(reply, plexus.MessageResponse{Message: err.Error()}); err != nil {
slog.Error(err.Error())
}
return
}
network, err := boltdb.Get[Network](request.Network, networkTable)
if errors.Is(err, boltdb.ErrNoResults) {
if err := ec.Publish(reply, plexus.MessageResponse{Message: "no such network"}); err != nil {
slog.Error(err.Error())
}
return
}
if err != nil {
slog.Error(err.Error())
if err := ec.Publish(reply, plexus.MessageResponse{Message: err.Error()}); err != nil {
slog.Error(err.Error())
}
return
}
if err := resetPeersOnNetworkInterface(self, network); err != nil {
slog.Error(err.Error())
if err := ec.Publish(reply, plexus.MessageResponse{Message: err.Error()}); err != nil {
slog.Error(err.Error())
}
return
}
if err := ec.Publish(reply, plexus.MessageResponse{Message: "interface reset"}); err != nil {
slog.Error(err.Error())
}
})
_, _ = ec.Subscribe(Agent+plexus.Version, func(sub, reply string, long *bool) {
slog.Debug("version request")
response := plexus.VersionResponse{}
self, err := boltdb.Get[Device]("self", deviceTable)
if err != nil {
slog.Error("get device", "error", err)
if err := ec.Publish(reply, response); err != nil {
slog.Error("publish reply to version request", "error", err)
}
return
}
slog.Debug("checking version of server")
serverEC := serverConn.Load()
if serverEC != nil {
slog.Debug("server connection", "connected", serverEC.Conn.IsConnected())
if err := serverEC.Request(self.WGPublicKey+plexus.Version, nil, &response, NatsTimeout); err != nil {
slog.Error("version request", "error", err)
}
} else {
slog.Debug("not connected to server")
}
response.Agent = version + ": "
info, _ := debug.ReadBuildInfo()
for _, setting := range info.Settings {
if strings.Contains(setting.Key, "vcs") {
response.Agent = response.Agent + setting.Value + " "
}
}
if err := ec.Publish(reply, response); err != nil {
slog.Error("publish reply to version request", "error", err)
}
})
}
func ConnectToAgentBroker() (*nats.EncodedConn, error) {
url := fmt.Sprintf("nats://localhost:%d", Config.NatsPort)
slog.Debug("connecting to agent broker ", "url", url)
nc, err := nats.Connect(url)
if err != nil {
return nil, err
}
ec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
if err != nil {
return nil, err
}
return ec, nil
}
func subcribeToServerTopics(self Device) {
id := self.WGPublicKey
serverEC := serverConn.Load()
networkUpdates, err := serverEC.Subscribe("networks.>", networkUpdates)
if err != nil {
slog.Error("network subscription failed", "error", err)
}
subscriptions = append(subscriptions, networkUpdates)
ping, err := serverEC.Subscribe(plexus.Update+id+plexus.Ping, func(subj, reply string, data *any) {
if err := serverEC.Publish(reply, plexus.PingResponse{Message: "pong"}); err != nil {
slog.Error("publish pong", "error", err)
}
})
if err != nil {
slog.Error("ping subscription", "error", err)
}
subscriptions = append(subscriptions, ping)
leaveServer, err := serverEC.Subscribe(plexus.Update+id+plexus.LeaveServer, func(subj, reply string, data *any) {
slog.Info("leave server")
closeServerConnections()
deleteAllInterfaces()
deleteAllNetworks()
})
if err != nil {
slog.Error("leave server subscription", "error", err)
}
subscriptions = append(subscriptions, leaveServer)
joinNet, err := serverEC.Subscribe(plexus.Update+id+plexus.JoinNetwork, func(data *plexus.ServerJoinRequest) {
slog.Info("join network", "network", data.Network)
network, err := saveServerNetwork(data.Network)
if err != nil {
slog.Error("save network", "error", err)
return
}
if err := startInterface(self, network); err != nil {
slog.Error("error starting interface", "interface", network.Interface, "network", network.Name, "error", err)
return
}
})
if err != nil {
slog.Error("join network subscription", "error", err)
}
subscriptions = append(subscriptions, joinNet)
sendListenPorts, err := serverEC.Subscribe(plexus.Update+id+plexus.SendListenPorts,
func(subj, reply string, data plexus.ListenPortRequest) {
slog.Info("new listen ports", "network", data.Network)
response, err := getNewListenPorts(data.Network)
if err != nil {
slog.Error(err.Error())
return
}
if err := serverEC.Publish(reply, response); err != nil {
slog.Error("publish reply to SendListenPorts", "error", err)
}
slog.Debug("sent listenports to server", "public", response.PublicListenPort, "private", response.ListenPort)
})
if err != nil {
slog.Error("send listen port subscription", "error", err)
}
subscriptions = append(subscriptions, sendListenPorts)
}
func createRegistationConnection(key plexus.KeyValue) (*nats.EncodedConn, error) {
loginKeyPair, err := nkeys.FromSeed([]byte(key.Seed))
if err != nil {
return nil, err
}
loginPublicKey, err := loginKeyPair.PublicKey()
if err != nil {
return nil, err
}
sign := func(nonce []byte) ([]byte, error) {
return loginKeyPair.Sign(nonce)
}
opts := nats.Options{
Url: "nats://" + key.URL + ":4222",
Nkey: loginPublicKey,
SignatureCB: sign,
}
nc, err := opts.Connect()
if err != nil {
return nil, err
}
ec, err := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
if err != nil {
return nil, err
}
return ec, nil
}