mirror of
https://github.com/juanfont/headscale.git
synced 2024-09-20 15:26:35 +08:00
591 lines
16 KiB
Go
591 lines
16 KiB
Go
package headscale
|
|
|
|
import (
|
|
"context"
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/gin-gonic/gin"
|
|
"github.com/rs/zerolog/log"
|
|
"gorm.io/datatypes"
|
|
"gorm.io/gorm"
|
|
"tailscale.com/tailcfg"
|
|
"tailscale.com/types/key"
|
|
)
|
|
|
|
const (
|
|
keepAliveInterval = 60 * time.Second
|
|
updateCheckInterval = 10 * time.Second
|
|
)
|
|
|
|
// PollNetMapHandler takes care of /machine/:id/map
|
|
//
|
|
// This is the busiest endpoint, as it keeps the HTTP long poll that updates
|
|
// the clients when something in the network changes.
|
|
//
|
|
// The clients POST stuff like HostInfo and their Endpoints here, but
|
|
// only after their first request (marked with the ReadOnly field).
|
|
//
|
|
// At this moment the updates are sent in a quite horrendous way, but they kinda work.
|
|
func (h *Headscale) PollNetMapHandler(ctx *gin.Context) {
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Msg("PollNetMapHandler called")
|
|
body, _ := io.ReadAll(ctx.Request.Body)
|
|
machineKeyStr := ctx.Param("id")
|
|
|
|
var machineKey key.MachinePublic
|
|
err := machineKey.UnmarshalText([]byte(MachinePublicKeyEnsurePrefix(machineKeyStr)))
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMap").
|
|
Err(err).
|
|
Msg("Cannot parse client key")
|
|
ctx.String(http.StatusBadRequest, "")
|
|
|
|
return
|
|
}
|
|
req := tailcfg.MapRequest{}
|
|
err = decode(body, &req, &machineKey, h.privateKey)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMap").
|
|
Err(err).
|
|
Msg("Cannot decode message")
|
|
ctx.String(http.StatusBadRequest, "")
|
|
|
|
return
|
|
}
|
|
|
|
machine, err := h.GetMachineByMachineKey(machineKey)
|
|
if err != nil {
|
|
if errors.Is(err, gorm.ErrRecordNotFound) {
|
|
log.Warn().
|
|
Str("handler", "PollNetMap").
|
|
Msgf("Ignoring request, cannot find machine with key %s", machineKey.String())
|
|
ctx.String(http.StatusUnauthorized, "")
|
|
|
|
return
|
|
}
|
|
log.Error().
|
|
Str("handler", "PollNetMap").
|
|
Msgf("Failed to fetch machine from the database with Machine key: %s", machineKey.String())
|
|
ctx.String(http.StatusInternalServerError, "")
|
|
|
|
return
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Str("machine", machine.Name).
|
|
Msg("Found machine in database")
|
|
|
|
hostinfo, _ := json.Marshal(req.Hostinfo)
|
|
machine.Name = req.Hostinfo.Hostname
|
|
machine.HostInfo = datatypes.JSON(hostinfo)
|
|
machine.DiscoKey = DiscoPublicKeyStripPrefix(req.DiscoKey)
|
|
now := time.Now().UTC()
|
|
|
|
// From Tailscale client:
|
|
//
|
|
// ReadOnly is whether the client just wants to fetch the MapResponse,
|
|
// without updating their Endpoints. The Endpoints field will be ignored and
|
|
// LastSeen will not be updated and peers will not be notified of changes.
|
|
//
|
|
// The intended use is for clients to discover the DERP map at start-up
|
|
// before their first real endpoint update.
|
|
if !req.ReadOnly {
|
|
endpoints, _ := json.Marshal(req.Endpoints)
|
|
machine.Endpoints = datatypes.JSON(endpoints)
|
|
machine.LastSeen = &now
|
|
}
|
|
h.db.Updates(machine)
|
|
|
|
data, err := h.getMapResponse(machineKey, req, machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Str("machine", machine.Name).
|
|
Err(err).
|
|
Msg("Failed to get Map response")
|
|
ctx.String(http.StatusInternalServerError, ":(")
|
|
|
|
return
|
|
}
|
|
|
|
// We update our peers if the client is not sending ReadOnly in the MapRequest
|
|
// so we don't distribute its initial request (it comes with
|
|
// empty endpoints to peers)
|
|
|
|
// Details on the protocol can be found in https://github.com/tailscale/tailscale/blob/main/tailcfg/tailcfg.go#L696
|
|
log.Debug().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Str("machine", machine.Name).
|
|
Bool("readOnly", req.ReadOnly).
|
|
Bool("omitPeers", req.OmitPeers).
|
|
Bool("stream", req.Stream).
|
|
Msg("Client map request processed")
|
|
|
|
if req.ReadOnly {
|
|
log.Info().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Client is starting up. Probably interested in a DERP map")
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", data)
|
|
|
|
return
|
|
}
|
|
|
|
// There has been an update to _any_ of the nodes that the other nodes would
|
|
// need to know about
|
|
h.setLastStateChangeToNow(machine.Namespace.Name)
|
|
|
|
// The request is not ReadOnly, so we need to set up channels for updating
|
|
// peers via longpoll
|
|
|
|
// Only create update channel if it has not been created
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Str("machine", machine.Name).
|
|
Msg("Loading or creating update channel")
|
|
|
|
// TODO: could probably remove all that duplication once generics land.
|
|
closeChanWithLog := func(channel interface{}, name string) {
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "Done").
|
|
Msg(fmt.Sprintf("Closing %s channel", name))
|
|
|
|
switch c := channel.(type) {
|
|
case (chan struct{}):
|
|
close(c)
|
|
|
|
case (chan []byte):
|
|
close(c)
|
|
}
|
|
}
|
|
|
|
const chanSize = 8
|
|
updateChan := make(chan struct{}, chanSize)
|
|
defer closeChanWithLog(updateChan, "updateChan")
|
|
|
|
pollDataChan := make(chan []byte, chanSize)
|
|
defer closeChanWithLog(pollDataChan, "pollDataChan")
|
|
|
|
keepAliveChan := make(chan []byte)
|
|
defer closeChanWithLog(keepAliveChan, "keepAliveChan")
|
|
|
|
if req.OmitPeers && !req.Stream {
|
|
log.Info().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Client sent endpoint update and is ok with a response without peer list")
|
|
ctx.Data(http.StatusOK, "application/json; charset=utf-8", data)
|
|
|
|
// It sounds like we should update the nodes when we have received a endpoint update
|
|
// even tho the comments in the tailscale code dont explicitly say so.
|
|
updateRequestsFromNode.WithLabelValues(machine.Name, machine.Namespace.Name, "endpoint-update").
|
|
Inc()
|
|
updateChan <- struct{}{}
|
|
|
|
return
|
|
} else if req.OmitPeers && req.Stream {
|
|
log.Warn().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Ignoring request, don't know how to handle it")
|
|
ctx.String(http.StatusBadRequest, "")
|
|
|
|
return
|
|
}
|
|
|
|
log.Info().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Client is ready to access the tailnet")
|
|
log.Info().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Sending initial map")
|
|
pollDataChan <- data
|
|
|
|
log.Info().
|
|
Str("handler", "PollNetMap").
|
|
Str("machine", machine.Name).
|
|
Msg("Notifying peers")
|
|
updateRequestsFromNode.WithLabelValues(machine.Name, machine.Namespace.Name, "full-update").
|
|
Inc()
|
|
updateChan <- struct{}{}
|
|
|
|
h.PollNetMapStream(
|
|
ctx,
|
|
machine,
|
|
req,
|
|
machineKey,
|
|
pollDataChan,
|
|
keepAliveChan,
|
|
updateChan,
|
|
)
|
|
log.Trace().
|
|
Str("handler", "PollNetMap").
|
|
Str("id", ctx.Param("id")).
|
|
Str("machine", machine.Name).
|
|
Msg("Finished stream, closing PollNetMap session")
|
|
}
|
|
|
|
// PollNetMapStream takes care of /machine/:id/map
|
|
// stream logic, ensuring we communicate updates and data
|
|
// to the connected clients.
|
|
func (h *Headscale) PollNetMapStream(
|
|
ctx *gin.Context,
|
|
machine *Machine,
|
|
mapRequest tailcfg.MapRequest,
|
|
machineKey key.MachinePublic,
|
|
pollDataChan chan []byte,
|
|
keepAliveChan chan []byte,
|
|
updateChan chan struct{},
|
|
) {
|
|
{
|
|
ctx, cancel := context.WithCancel(ctx.Request.Context())
|
|
defer cancel()
|
|
|
|
go h.scheduledPollWorker(
|
|
ctx,
|
|
updateChan,
|
|
keepAliveChan,
|
|
machineKey,
|
|
mapRequest,
|
|
machine,
|
|
)
|
|
}
|
|
|
|
ctx.Stream(func(writer io.Writer) bool {
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Msg("Waiting for data to stream...")
|
|
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Msgf("pollData is %#v, keepAliveChan is %#v, updateChan is %#v", pollDataChan, keepAliveChan, updateChan)
|
|
|
|
select {
|
|
case data := <-pollDataChan:
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Int("bytes", len(data)).
|
|
Msg("Sending data received via pollData channel")
|
|
_, err := writer.Write(data)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Err(err).
|
|
Msg("Cannot write data")
|
|
|
|
return false
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Int("bytes", len(data)).
|
|
Msg("Data from pollData channel written successfully")
|
|
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err = h.UpdateMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return false
|
|
}
|
|
now := time.Now().UTC()
|
|
machine.LastSeen = &now
|
|
|
|
lastStateUpdate.WithLabelValues(machine.Namespace.Name, machine.Name).
|
|
Set(float64(now.Unix()))
|
|
machine.LastSuccessfulUpdate = &now
|
|
|
|
err = h.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSuccessfulUpdate")
|
|
} else {
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "pollData").
|
|
Int("bytes", len(data)).
|
|
Msg("Machine entry in database updated successfully after sending pollData")
|
|
}
|
|
|
|
return true
|
|
|
|
case data := <-keepAliveChan:
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Int("bytes", len(data)).
|
|
Msg("Sending keep alive message")
|
|
_, err := writer.Write(data)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Err(err).
|
|
Msg("Cannot write keep alive message")
|
|
|
|
return false
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Int("bytes", len(data)).
|
|
Msg("Keep alive sent successfully")
|
|
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err = h.UpdateMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return false
|
|
}
|
|
now := time.Now().UTC()
|
|
machine.LastSeen = &now
|
|
err = h.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSeen")
|
|
} else {
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "keepAlive").
|
|
Int("bytes", len(data)).
|
|
Msg("Machine updated successfully after sending keep alive")
|
|
}
|
|
|
|
return true
|
|
|
|
case <-updateChan:
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Msg("Received a request for update")
|
|
updateRequestsReceivedOnChannel.WithLabelValues(machine.Name, machine.Namespace.Name).
|
|
Inc()
|
|
if h.isOutdated(machine) {
|
|
var lastUpdate time.Time
|
|
if machine.LastSuccessfulUpdate != nil {
|
|
lastUpdate = *machine.LastSuccessfulUpdate
|
|
}
|
|
log.Debug().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Time("last_successful_update", lastUpdate).
|
|
Time("last_state_change", h.getLastStateChange(machine.Namespace.Name)).
|
|
Msgf("There has been updates since the last successful update to %s", machine.Name)
|
|
data, err := h.getMapResponse(machineKey, mapRequest, machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Could not get the map update")
|
|
}
|
|
_, err = writer.Write(data)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Could not write the map response")
|
|
updateRequestsSentToNode.WithLabelValues(machine.Name, machine.Namespace.Name, "failed").
|
|
Inc()
|
|
|
|
return false
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Msg("Updated Map has been sent")
|
|
updateRequestsSentToNode.WithLabelValues(machine.Name, machine.Namespace.Name, "success").
|
|
Inc()
|
|
|
|
// Keep track of the last successful update,
|
|
// we sometimes end in a state were the update
|
|
// is not picked up by a client and we use this
|
|
// to determine if we should "force" an update.
|
|
// TODO(kradalby): Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err = h.UpdateMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return false
|
|
}
|
|
now := time.Now().UTC()
|
|
|
|
lastStateUpdate.WithLabelValues(machine.Namespace.Name, machine.Name).
|
|
Set(float64(now.Unix()))
|
|
machine.LastSuccessfulUpdate = &now
|
|
|
|
err = h.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "update").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSuccessfulUpdate")
|
|
}
|
|
} else {
|
|
var lastUpdate time.Time
|
|
if machine.LastSuccessfulUpdate != nil {
|
|
lastUpdate = *machine.LastSuccessfulUpdate
|
|
}
|
|
log.Trace().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Time("last_successful_update", lastUpdate).
|
|
Time("last_state_change", h.getLastStateChange(machine.Namespace.Name)).
|
|
Msgf("%s is up to date", machine.Name)
|
|
}
|
|
|
|
return true
|
|
|
|
case <-ctx.Request.Context().Done():
|
|
log.Info().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Msg("The client has closed the connection")
|
|
// TODO: Abstract away all the database calls, this can cause race conditions
|
|
// when an outdated machine object is kept alive, e.g. db is update from
|
|
// command line, but then overwritten.
|
|
err := h.UpdateMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "Done").
|
|
Err(err).
|
|
Msg("Cannot update machine from database")
|
|
|
|
// client has been removed from database
|
|
// since the stream opened, terminate connection.
|
|
return false
|
|
}
|
|
now := time.Now().UTC()
|
|
machine.LastSeen = &now
|
|
err = h.TouchMachine(machine)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("handler", "PollNetMapStream").
|
|
Str("machine", machine.Name).
|
|
Str("channel", "Done").
|
|
Err(err).
|
|
Msg("Cannot update machine LastSeen")
|
|
}
|
|
|
|
return false
|
|
}
|
|
})
|
|
}
|
|
|
|
func (h *Headscale) scheduledPollWorker(
|
|
ctx context.Context,
|
|
updateChan chan<- struct{},
|
|
keepAliveChan chan<- []byte,
|
|
machineKey key.MachinePublic,
|
|
mapRequest tailcfg.MapRequest,
|
|
machine *Machine,
|
|
) {
|
|
keepAliveTicker := time.NewTicker(keepAliveInterval)
|
|
updateCheckerTicker := time.NewTicker(updateCheckInterval)
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return
|
|
|
|
case <-keepAliveTicker.C:
|
|
data, err := h.getMapKeepAliveResponse(machineKey, mapRequest)
|
|
if err != nil {
|
|
log.Error().
|
|
Str("func", "keepAlive").
|
|
Err(err).
|
|
Msg("Error generating the keep alive msg")
|
|
|
|
return
|
|
}
|
|
|
|
log.Debug().
|
|
Str("func", "keepAlive").
|
|
Str("machine", machine.Name).
|
|
Msg("Sending keepalive")
|
|
keepAliveChan <- data
|
|
|
|
case <-updateCheckerTicker.C:
|
|
log.Debug().
|
|
Str("func", "scheduledPollWorker").
|
|
Str("machine", machine.Name).
|
|
Msg("Sending update request")
|
|
updateRequestsFromNode.WithLabelValues(machine.Name, machine.Namespace.Name, "scheduled-update").
|
|
Inc()
|
|
updateChan <- struct{}{}
|
|
}
|
|
}
|
|
}
|