mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-22 13:05:36 +03:00
2a1ad532f4
Merge in DNS/adguard-home from 4499-rm-unnecessary-locking to master Squashed commit of the following: commit 6d70472506dd0fd69225454c73d9f7f6a208b76b Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Apr 25 17:26:54 2022 +0300 home: rm unnecessary locking in update; refactor
219 lines
5.5 KiB
Go
219 lines
5.5 KiB
Go
package home
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import (
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"context"
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"encoding/json"
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"fmt"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"runtime"
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"syscall"
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"time"
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"github.com/AdguardTeam/AdGuardHome/internal/aghhttp"
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"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
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"github.com/AdguardTeam/AdGuardHome/internal/updater"
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"github.com/AdguardTeam/golibs/errors"
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"github.com/AdguardTeam/golibs/log"
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)
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// temporaryError is the interface for temporary errors from the Go standard
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// library.
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type temporaryError interface {
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error
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Temporary() (ok bool)
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}
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// Get the latest available version from the Internet
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func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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resp := &versionResponse{}
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if Context.disableUpdate {
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resp.Disabled = true
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err := json.NewEncoder(w).Encode(resp)
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if err != nil {
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aghhttp.Error(r, w, http.StatusInternalServerError, "writing body: %s", err)
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}
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return
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}
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req := &struct {
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Recheck bool `json:"recheck_now"`
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}{}
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var err error
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if r.ContentLength != 0 {
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err = json.NewDecoder(r.Body).Decode(req)
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if err != nil {
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aghhttp.Error(r, w, http.StatusBadRequest, "parsing request: %s", err)
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return
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}
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}
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err = requestVersionInfo(resp, req.Recheck)
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if err != nil {
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// Don't wrap the error, because it's informative enough as is.
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aghhttp.Error(r, w, http.StatusBadGateway, "%s", err)
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return
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}
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err = resp.setAllowedToAutoUpdate()
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if err != nil {
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// Don't wrap the error, because it's informative enough as is.
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aghhttp.Error(r, w, http.StatusInternalServerError, "%s", err)
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return
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}
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err = json.NewEncoder(w).Encode(resp)
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if err != nil {
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aghhttp.Error(r, w, http.StatusInternalServerError, "writing body: %s", err)
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}
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}
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// requestVersionInfo sets the VersionInfo field of resp if it can reach the
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// update server.
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func requestVersionInfo(resp *versionResponse, recheck bool) (err error) {
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for i := 0; i != 3; i++ {
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resp.VersionInfo, err = Context.updater.VersionInfo(recheck)
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if err != nil {
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var terr temporaryError
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if errors.As(err, &terr) && terr.Temporary() {
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// Temporary network error. This case may happen while we're
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// restarting our DNS server. Log and sleep for some time.
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//
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// See https://github.com/AdguardTeam/AdGuardHome/issues/934.
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d := time.Duration(i) * time.Second
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log.Info("update: temp net error: %q; sleeping for %s and retrying", err, d)
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time.Sleep(d)
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continue
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}
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}
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break
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}
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if err != nil {
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vcu := Context.updater.VersionCheckURL()
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return fmt.Errorf("getting version info from %s: %s", vcu, err)
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}
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return nil
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}
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// handleUpdate performs an update to the latest available version procedure.
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func handleUpdate(w http.ResponseWriter, r *http.Request) {
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if Context.updater.NewVersion() == "" {
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aghhttp.Error(r, w, http.StatusBadRequest, "/update request isn't allowed now")
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return
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}
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err := Context.updater.Update()
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if err != nil {
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aghhttp.Error(r, w, http.StatusInternalServerError, "%s", err)
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return
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}
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aghhttp.OK(w)
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if f, ok := w.(http.Flusher); ok {
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f.Flush()
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}
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// The background context is used because the underlying functions wrap
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// it with timeout and shut down the server, which handles current
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// request. It also should be done in a separate goroutine due to the
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// same reason.
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go func() {
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finishUpdate(context.Background())
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}()
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}
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// versionResponse is the response for /control/version.json endpoint.
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type versionResponse struct {
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updater.VersionInfo
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Disabled bool `json:"disabled"`
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}
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// setAllowedToAutoUpdate sets CanAutoUpdate to true if AdGuard Home is actually
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// allowed to perform an automatic update by the OS.
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func (vr *versionResponse) setAllowedToAutoUpdate() (err error) {
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if vr.CanAutoUpdate == nil || !*vr.CanAutoUpdate {
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return
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}
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tlsConf := &tlsConfigSettings{}
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Context.tls.WriteDiskConfig(tlsConf)
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canUpdate := true
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if tlsConfUsesPrivilegedPorts(tlsConf) || config.BindPort < 1024 || config.DNS.Port < 1024 {
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canUpdate, err = aghnet.CanBindPrivilegedPorts()
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if err != nil {
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return fmt.Errorf("checking ability to bind privileged ports: %w", err)
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}
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}
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vr.CanAutoUpdate = &canUpdate
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return nil
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}
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// tlsConfUsesPrivilegedPorts returns true if the provided TLS configuration
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// indicates that privileged ports are used.
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func tlsConfUsesPrivilegedPorts(c *tlsConfigSettings) (ok bool) {
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return c.Enabled && (c.PortHTTPS < 1024 || c.PortDNSOverTLS < 1024 || c.PortDNSOverQUIC < 1024)
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}
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// finishUpdate completes an update procedure.
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func finishUpdate(ctx context.Context) {
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log.Info("Stopping all tasks")
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cleanup(ctx)
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cleanupAlways()
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exeName := "AdGuardHome"
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if runtime.GOOS == "windows" {
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exeName = "AdGuardHome.exe"
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}
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curBinName := filepath.Join(Context.workDir, exeName)
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if runtime.GOOS == "windows" {
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if Context.runningAsService {
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// Note:
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// we can't restart the service via "kardianos/service" package - it kills the process first
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// we can't start a new instance - Windows doesn't allow it
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cmd := exec.Command("cmd", "/c", "net stop AdGuardHome & net start AdGuardHome")
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err := cmd.Start()
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if err != nil {
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log.Fatalf("exec.Command() failed: %s", err)
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}
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os.Exit(0)
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}
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cmd := exec.Command(curBinName, os.Args[1:]...)
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log.Info("Restarting: %v", cmd.Args)
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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err := cmd.Start()
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if err != nil {
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log.Fatalf("exec.Command() failed: %s", err)
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}
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os.Exit(0)
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} else {
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log.Info("Restarting: %v", os.Args)
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err := syscall.Exec(curBinName, os.Args, os.Environ())
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if err != nil {
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log.Fatalf("syscall.Exec() failed: %s", err)
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}
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// Unreachable code
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}
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}
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