349 lines
8.8 KiB
Go
349 lines
8.8 KiB
Go
package hscontrol
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import (
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"context"
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"fmt"
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"net/http"
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"time"
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"github.com/juanfont/headscale/hscontrol/mapper"
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"github.com/juanfont/headscale/hscontrol/types"
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"github.com/juanfont/headscale/hscontrol/util"
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"github.com/rs/zerolog/log"
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"tailscale.com/tailcfg"
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)
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const (
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keepAliveInterval = 60 * time.Second
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)
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type contextKey string
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const machineNameContextKey = contextKey("machineName")
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type UpdateNode func()
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func logPollFunc(
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mapRequest tailcfg.MapRequest,
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machine *types.Machine,
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isNoise bool,
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) (func(string), func(error, string)) {
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return func(msg string) {
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log.Info().
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Caller().
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Bool("noise", isNoise).
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Bool("readOnly", mapRequest.ReadOnly).
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Bool("omitPeers", mapRequest.OmitPeers).
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Bool("stream", mapRequest.Stream).
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Str("node_key", machine.NodeKey).
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Str("machine", machine.Hostname).
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Msg(msg)
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},
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func(err error, msg string) {
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log.Error().
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Caller().
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Bool("noise", isNoise).
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Bool("readOnly", mapRequest.ReadOnly).
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Bool("omitPeers", mapRequest.OmitPeers).
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Bool("stream", mapRequest.Stream).
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Str("node_key", machine.NodeKey).
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Str("machine", machine.Hostname).
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Err(err).
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Msg(msg)
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}
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}
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// handlePoll is the common code for the legacy and Noise protocols to
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// managed the poll loop.
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func (h *Headscale) handlePoll(
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writer http.ResponseWriter,
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ctx context.Context,
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machine *types.Machine,
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mapRequest tailcfg.MapRequest,
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isNoise bool,
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) {
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logInfo, logErr := logPollFunc(mapRequest, machine, isNoise)
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mapp := mapper.NewMapper(
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h.db,
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h.privateKey2019,
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isNoise,
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h.DERPMap,
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h.cfg.BaseDomain,
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h.cfg.DNSConfig,
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h.cfg.LogTail.Enabled,
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h.cfg.RandomizeClientPort,
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)
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machine.Hostname = mapRequest.Hostinfo.Hostname
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machine.HostInfo = types.HostInfo(*mapRequest.Hostinfo)
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machine.DiscoKey = util.DiscoPublicKeyStripPrefix(mapRequest.DiscoKey)
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now := time.Now().UTC()
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err := h.db.ProcessMachineRoutes(machine)
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if err != nil {
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logErr(err, "Error processing machine routes")
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}
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// update ACLRules with peer informations (to update server tags if necessary)
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if h.ACLPolicy != nil {
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// update routes with peer information
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err = h.db.EnableAutoApprovedRoutes(h.ACLPolicy, machine)
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if err != nil {
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logErr(err, "Error running auto approved routes")
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}
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}
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// From Tailscale client:
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//
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// ReadOnly is whether the client just wants to fetch the MapResponse,
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// without updating their Endpoints. The Endpoints field will be ignored and
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// LastSeen will not be updated and peers will not be notified of changes.
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//
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// The intended use is for clients to discover the DERP map at start-up
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// before their first real endpoint update.
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if !mapRequest.ReadOnly {
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machine.Endpoints = mapRequest.Endpoints
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machine.LastSeen = &now
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}
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// TODO(kradalby): Save specific stuff, not whole object.
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if err := h.db.MachineSave(machine); err != nil {
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logErr(err, "Failed to persist/update machine in the database")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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mapResp, err := mapp.FullMapResponse(mapRequest, machine, h.ACLPolicy)
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if err != nil {
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logErr(err, "Failed to create MapResponse")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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// We update our peers if the client is not sending ReadOnly in the MapRequest
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// so we don't distribute its initial request (it comes with
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// empty endpoints to peers)
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// Details on the protocol can be found in https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L696
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logInfo("Client map request processed")
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if mapRequest.ReadOnly {
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logInfo("Client is starting up. Probably interested in a DERP map")
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err := writer.Write(mapResp)
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if err != nil {
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logErr(err, "Failed to write response")
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}
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if f, ok := writer.(http.Flusher); ok {
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f.Flush()
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}
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return
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}
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if mapRequest.OmitPeers && !mapRequest.Stream {
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logInfo("Client sent endpoint update and is ok with a response without peer list")
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writer.Header().Set("Content-Type", "application/json; charset=utf-8")
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writer.WriteHeader(http.StatusOK)
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_, err := writer.Write(mapResp)
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if err != nil {
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logErr(err, "Failed to write response")
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}
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// It sounds like we should update the nodes when we have received a endpoint update
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// even tho the comments in the tailscale code dont explicitly say so.
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updateRequestsFromNode.WithLabelValues(machine.User.Name, machine.Hostname, "endpoint-update").
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Inc()
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// Tell all the other nodes about the new endpoint, but dont update ourselves.
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h.nodeNotifier.NotifyWithIgnore(
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types.StateUpdate{
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Type: types.StatePeerChanged,
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Changed: []uint64{machine.ID},
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},
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machine.MachineKey)
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return
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} else if mapRequest.OmitPeers && mapRequest.Stream {
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log.Warn().
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Str("handler", "PollNetMap").
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Bool("noise", isNoise).
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Str("machine", machine.Hostname).
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Msg("Ignoring request, don't know how to handle it")
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http.Error(writer, "", http.StatusBadRequest)
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return
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}
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logInfo("Sending initial map")
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// Send the client an update to make sure we send an initial mapresponse
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_, err = writer.Write(mapResp)
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if err != nil {
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logErr(err, "Could not write the map response")
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return
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}
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if flusher, ok := writer.(http.Flusher); ok {
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flusher.Flush()
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} else {
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return
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}
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h.pollNetMapStream(
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writer,
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ctx,
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machine,
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mapp,
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mapRequest,
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isNoise,
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)
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logInfo("Finished stream, closing PollNetMap session")
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}
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// pollNetMapStream stream logic for /machine/map,
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// ensuring we communicate updates and data to the connected clients.
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func (h *Headscale) pollNetMapStream(
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writer http.ResponseWriter,
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ctxReq context.Context,
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machine *types.Machine,
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mapp *mapper.Mapper,
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mapRequest tailcfg.MapRequest,
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isNoise bool,
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) {
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logInfo, logErr := logPollFunc(mapRequest, machine, isNoise)
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keepAliveTicker := time.NewTicker(keepAliveInterval)
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h.pollNetMapStreamWG.Add(1)
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defer h.pollNetMapStreamWG.Done()
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updateChan := make(chan types.StateUpdate)
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defer closeChanWithLog(updateChan, machine.Hostname, "updateChan")
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// Register the node's update channel
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h.nodeNotifier.AddNode(machine.MachineKey, updateChan)
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defer h.nodeNotifier.RemoveNode(machine.MachineKey)
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ctx := context.WithValue(ctxReq, machineNameContextKey, machine.Hostname)
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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for {
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select {
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case <-keepAliveTicker.C:
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data, err := mapp.KeepAliveResponse(mapRequest, machine)
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if err != nil {
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logErr(err, "Error generating the keep alive msg")
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return
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}
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_, err = writer.Write(data)
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if err != nil {
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logErr(err, "Cannot write keep alive message")
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return
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}
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if flusher, ok := writer.(http.Flusher); ok {
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flusher.Flush()
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} else {
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return
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}
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err = h.db.TouchMachine(machine)
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if err != nil {
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logErr(err, "Cannot update machine LastSeen")
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return
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}
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case update := <-updateChan:
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var data []byte
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var err error
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switch update.Type {
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case types.StatePeerChanged:
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logInfo("Sending PeerChanged MapResponse")
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data, err = mapp.PeerChangedResponse(mapRequest, machine, update.Changed, h.ACLPolicy)
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case types.StatePeerRemoved:
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logInfo("Sending PeerRemoved MapResponse")
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data, err = mapp.PeerRemovedResponse(mapRequest, machine, update.Removed)
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case types.StateDERPUpdated:
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logInfo("Sending DERPUpdate MapResponse")
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data, err = mapp.DERPMapResponse(mapRequest, machine, update.DERPMap)
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case types.StateFullUpdate:
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logInfo("Sending Full MapResponse")
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data, err = mapp.FullMapResponse(mapRequest, machine, h.ACLPolicy)
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}
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if err != nil {
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logErr(err, "Could not get the create map update")
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return
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}
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_, err = writer.Write(data)
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if err != nil {
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logErr(err, "Could not write the map response")
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updateRequestsSentToNode.WithLabelValues(machine.User.Name, machine.Hostname, "failed").
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Inc()
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return
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}
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if flusher, ok := writer.(http.Flusher); ok {
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flusher.Flush()
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} else {
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return
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}
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// Keep track of the last successful update,
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// we sometimes end in a state were the update
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// is not picked up by a client and we use this
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// to determine if we should "force" an update.
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err = h.db.TouchMachine(machine)
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if err != nil {
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logErr(err, "Cannot update machine LastSuccessfulUpdate")
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return
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}
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case <-ctx.Done():
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logInfo("The client has closed the connection")
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err := h.db.TouchMachine(machine)
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if err != nil {
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logErr(err, "Cannot update machine LastSeen")
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}
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// The connection has been closed, so we can stop polling.
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return
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case <-h.shutdownChan:
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logInfo("The long-poll handler is shutting down")
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return
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}
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}
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}
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func closeChanWithLog[C chan []byte | chan struct{} | chan types.StateUpdate](channel C, machine, name string) {
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log.Trace().
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Str("handler", "PollNetMap").
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Str("machine", machine).
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Str("channel", "Done").
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Msg(fmt.Sprintf("Closing %s channel", name))
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close(channel)
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}
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