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control_update.go
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control_update.go
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package home
import (
"encoding/json"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"syscall"
"github.com/AdguardTeam/AdGuardHome/update"
"github.com/AdguardTeam/AdGuardHome/util"
"github.com/AdguardTeam/golibs/log"
)
type getVersionJSONRequest struct {
RecheckNow bool `json:"recheck_now"`
}
// Get the latest available version from the Internet
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
if Context.disableUpdate {
resp := make(map[string]interface{})
resp["disabled"] = true
d, _ := json.Marshal(resp)
_, _ = w.Write(d)
return
}
req := getVersionJSONRequest{}
var err error
if r.ContentLength != 0 {
err = json.NewDecoder(r.Body).Decode(&req)
if err != nil {
httpError(w, http.StatusBadRequest, "JSON parse: %s", err)
return
}
}
var info update.VersionInfo
for i := 0; i != 3; i++ {
Context.controlLock.Lock()
info, err = Context.updater.GetVersionResponse(req.RecheckNow)
Context.controlLock.Unlock()
if err != nil && strings.HasSuffix(err.Error(), "i/o timeout") {
// This case may happen while we're restarting DNS server
// https://github.com/AdguardTeam/AdGuardHome/issues/934
continue
}
break
}
if err != nil {
httpError(w, http.StatusBadGateway, "Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
return
}
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(getVersionResp(info))
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
}
// Perform an update procedure to the latest available version
func handleUpdate(w http.ResponseWriter, _ *http.Request) {
if len(Context.updater.NewVersion) == 0 {
httpError(w, http.StatusBadRequest, "/update request isn't allowed now")
return
}
err := Context.updater.DoUpdate()
if err != nil {
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
returnOK(w)
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
go finishUpdate()
}
// Convert version.json data to our JSON response
func getVersionResp(info update.VersionInfo) []byte {
ret := make(map[string]interface{})
ret["can_autoupdate"] = false
ret["new_version"] = info.NewVersion
ret["announcement"] = info.Announcement
ret["announcement_url"] = info.AnnouncementURL
if info.CanAutoUpdate {
canUpdate := true
tlsConf := tlsConfigSettings{}
Context.tls.WriteDiskConfig(&tlsConf)
if runtime.GOOS != "windows" &&
((tlsConf.Enabled && (tlsConf.PortHTTPS < 1024 ||
tlsConf.PortDNSOverTLS < 1024 ||
tlsConf.PortDNSOverQUIC < 1024)) ||
config.BindPort < 1024 ||
config.DNS.Port < 1024) {
// On UNIX, if we're running under a regular user,
// but with CAP_NET_BIND_SERVICE set on a binary file,
// and we're listening on ports <1024,
// we won't be able to restart after we replace the binary file,
// because we'll lose CAP_NET_BIND_SERVICE capability.
canUpdate, _ = util.HaveAdminRights()
}
ret["can_autoupdate"] = canUpdate
}
d, _ := json.Marshal(ret)
return d
}
// Complete an update procedure
func finishUpdate() {
log.Info("Stopping all tasks")
cleanup()
cleanupAlways()
exeName := "AdGuardHome"
if runtime.GOOS == "windows" {
exeName = "AdGuardHome.exe"
}
curBinName := filepath.Join(Context.workDir, exeName)
if runtime.GOOS == "windows" {
if Context.runningAsService {
// Note:
// we can't restart the service via "kardianos/service" package - it kills the process first
// we can't start a new instance - Windows doesn't allow it
cmd := exec.Command("cmd", "/c", "net stop AdGuardHome & net start AdGuardHome")
err := cmd.Start()
if err != nil {
log.Fatalf("exec.Command() failed: %s", err)
}
os.Exit(0)
}
cmd := exec.Command(curBinName, os.Args[1:]...)
log.Info("Restarting: %v", cmd.Args)
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err := cmd.Start()
if err != nil {
log.Fatalf("exec.Command() failed: %s", err)
}
os.Exit(0)
} else {
log.Info("Restarting: %v", os.Args)
err := syscall.Exec(curBinName, os.Args, os.Environ())
if err != nil {
log.Fatalf("syscall.Exec() failed: %s", err)
}
// Unreachable code
}
}