mirror of
https://github.com/juanfont/headscale.git
synced 2024-11-26 17:03:06 +00:00
407 lines
10 KiB
Go
407 lines
10 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/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 nodeNameContextKey = contextKey("nodeName")
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type UpdateNode func()
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func logPollFunc(
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mapRequest tailcfg.MapRequest,
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node *types.Node,
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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("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", node.NodeKey.ShortString()).
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Str("node", node.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("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", node.NodeKey.ShortString()).
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Str("node", node.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 ensures the node gets the appropriate updates from either
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// polling or immediate responses.
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//
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//nolint:gocyclo
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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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node *types.Node,
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mapRequest tailcfg.MapRequest,
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) {
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logInfo, logErr := logPollFunc(mapRequest, node)
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// This is the mechanism where the node gives us inforamtion about its
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// current configuration.
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//
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// If OmitPeers is true, Stream is false, and ReadOnly is false,
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// then te server will let clients update their endpoints without
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// breaking existing long-polling (Stream == true) connections.
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// In this case, the server can omit the entire response; the client
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// only checks the HTTP response status code.
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if mapRequest.OmitPeers && !mapRequest.Stream && !mapRequest.ReadOnly {
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log.Info().
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Caller().
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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", node.NodeKey.ShortString()).
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Str("node", node.Hostname).
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Int("cap_ver", int(mapRequest.Version)).
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Msg("Received endpoint update")
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now := time.Now().UTC()
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node.LastSeen = &now
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node.Hostname = mapRequest.Hostinfo.Hostname
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node.Hostinfo = mapRequest.Hostinfo
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node.DiscoKey = mapRequest.DiscoKey
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node.Endpoints = mapRequest.Endpoints
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if err := h.db.NodeSave(node); err != nil {
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logErr(err, "Failed to persist/update node 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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err := h.db.SaveNodeRoutes(node)
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if err != nil {
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logErr(err, "Error processing node routes")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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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: types.Nodes{node},
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},
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node.MachineKey.String())
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writer.WriteHeader(http.StatusOK)
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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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// ReadOnly is whether the client just wants to fetch the
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// MapResponse, without updating their Endpoints. The
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// Endpoints field will be ignored and LastSeen will not be
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// 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
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// start-up before their first real endpoint update.
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} else if mapRequest.OmitPeers && !mapRequest.Stream && mapRequest.ReadOnly {
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h.handleLiteRequest(writer, node, mapRequest)
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return
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} else if mapRequest.OmitPeers && mapRequest.Stream {
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logErr(nil, "Ignoring request, don't know how to handle it")
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return
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}
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now := time.Now().UTC()
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node.LastSeen = &now
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node.Hostname = mapRequest.Hostinfo.Hostname
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node.Hostinfo = mapRequest.Hostinfo
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node.DiscoKey = mapRequest.DiscoKey
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node.Endpoints = mapRequest.Endpoints
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// When a node connects to control, list the peers it has at
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// that given point, further updates are kept in memory in
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// the Mapper, which lives for the duration of the polling
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// session.
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peers, err := h.db.ListPeers(node)
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if err != nil {
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logErr(err, "Failed to list peers when opening poller")
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http.Error(writer, "", http.StatusInternalServerError)
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return
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}
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mapp := mapper.NewMapper(
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node,
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peers,
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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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err = h.db.SaveNodeRoutes(node)
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if err != nil {
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logErr(err, "Error processing node 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, node)
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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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// TODO(kradalby): Save specific stuff, not whole object.
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if err := h.db.NodeSave(node); err != nil {
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logErr(err, "Failed to persist/update node 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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logInfo("Sending initial map")
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mapResp, err := mapp.FullMapResponse(mapRequest, node, 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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// 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.nodeNotifier.NotifyWithIgnore(
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types.StateUpdate{
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Type: types.StatePeerChanged,
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Changed: types.Nodes{node},
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},
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node.MachineKey.String())
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// Set up the client stream
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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, node.Hostname, "updateChan")
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// Register the node's update channel
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h.nodeNotifier.AddNode(node.MachineKey, updateChan)
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defer h.nodeNotifier.RemoveNode(node.MachineKey)
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keepAliveTicker := time.NewTicker(keepAliveInterval)
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ctx = context.WithValue(ctx, nodeNameContextKey, node.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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logInfo("Waiting for update on stream channel")
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select {
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case <-keepAliveTicker.C:
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data, err := mapp.KeepAliveResponse(mapRequest, node)
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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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log.Error().Msg("Failed to create http flusher")
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return
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}
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// This goroutine is not ideal, but we have a potential issue here
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// where it blocks too long and that holds up updates.
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// One alternative is to split these different channels into
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// goroutines, but then you might have a problem without a lock
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// if a keepalive is written at the same time as an update.
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go func() {
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err = h.db.UpdateLastSeen(node)
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if err != nil {
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logErr(err, "Cannot update node LastSeen")
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return
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}
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}()
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case update := <-updateChan:
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logInfo("Received update")
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now := time.Now()
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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, node, 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, node, 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, node, 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, node, 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(node.User.Name, node.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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log.Error().Msg("Failed to create http flusher")
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return
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}
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// See comment in keepAliveTicker
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go func() {
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err = h.db.UpdateLastSeen(node)
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if err != nil {
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logErr(err, "Cannot update node LastSeen")
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return
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}
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}()
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log.Info().
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Caller().
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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", node.NodeKey.ShortString()).
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Str("node", node.Hostname).
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TimeDiff("timeSpent", time.Now(), now).
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Msg("update sent")
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case <-ctx.Done():
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logInfo("The client has closed the connection")
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go func() {
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err = h.db.UpdateLastSeen(node)
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if err != nil {
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logErr(err, "Cannot update node LastSeen")
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return
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}
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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, node, name string) {
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log.Trace().
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Str("handler", "PollNetMap").
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Str("node", node).
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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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func (h *Headscale) handleLiteRequest(
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writer http.ResponseWriter,
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node *types.Node,
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mapRequest tailcfg.MapRequest,
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) {
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logInfo, logErr := logPollFunc(mapRequest, node)
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mapp := mapper.NewMapper(
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node,
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// TODO(kradalby): It might not be acceptable to send
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// an empty peer list here.
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types.Nodes{},
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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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logInfo("Client asked for a lite update, responding without peers")
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mapResp, err := mapp.LiteMapResponse(mapRequest, node, 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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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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}
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