headscale/protocol_legacy_poll.go
2022-09-04 15:14:12 +02:00

95 lines
2.4 KiB
Go

package headscale
import (
"errors"
"io"
"net/http"
"github.com/gorilla/mux"
"github.com/rs/zerolog/log"
"gorm.io/gorm"
"tailscale.com/tailcfg"
"tailscale.com/types/key"
)
// 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(
writer http.ResponseWriter,
req *http.Request,
) {
vars := mux.Vars(req)
machineKeyStr, ok := vars["mkey"]
if !ok || machineKeyStr == "" {
log.Error().
Str("handler", "PollNetMap").
Msg("No machine key in request")
http.Error(writer, "No machine key in request", http.StatusBadRequest)
return
}
log.Trace().
Str("handler", "PollNetMap").
Str("id", machineKeyStr).
Msg("PollNetMapHandler called")
body, _ := io.ReadAll(req.Body)
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")
http.Error(writer, "Cannot parse client key", http.StatusBadRequest)
return
}
mapRequest := tailcfg.MapRequest{}
err = decode(body, &mapRequest, &machineKey, h.privateKey)
if err != nil {
log.Error().
Str("handler", "PollNetMap").
Err(err).
Msg("Cannot decode message")
http.Error(writer, "Cannot decode message", 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())
http.Error(writer, "", http.StatusUnauthorized)
return
}
log.Error().
Str("handler", "PollNetMap").
Msgf("Failed to fetch machine from the database with Machine key: %s", machineKey.String())
http.Error(writer, "", http.StatusInternalServerError)
return
}
log.Trace().
Str("handler", "PollNetMap").
Str("id", machineKeyStr).
Str("machine", machine.Hostname).
Msg("A machine is entering polling via the legacy protocol")
h.handlePollCommon(writer, req.Context(), machine, mapRequest, false)
}