AdGuardHome/home/control_update.go

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package home
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import (
"archive/tar"
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"archive/zip"
"compress/gzip"
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"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strings"
"syscall"
"time"
"github.com/AdguardTeam/golibs/log"
)
// Convert version.json data to our JSON response
func getVersionResp(data []byte) []byte {
versionJSON := make(map[string]interface{})
err := json.Unmarshal(data, &versionJSON)
if err != nil {
log.Error("version.json: %s", err)
return []byte{}
}
ret := make(map[string]interface{})
ret["can_autoupdate"] = false
var ok1, ok2, ok3 bool
ret["new_version"], ok1 = versionJSON["version"].(string)
ret["announcement"], ok2 = versionJSON["announcement"].(string)
ret["announcement_url"], ok3 = versionJSON["announcement_url"].(string)
selfUpdateMinVersion, ok4 := versionJSON["selfupdate_min_version"].(string)
if !ok1 || !ok2 || !ok3 || !ok4 {
log.Error("version.json: invalid data")
return []byte{}
}
_, ok := versionJSON[fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)]
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if ok && ret["new_version"] != versionString && versionString >= selfUpdateMinVersion {
ret["can_autoupdate"] = true
}
d, _ := json.Marshal(ret)
return d
}
type getVersionJSONRequest struct {
RecheckNow bool `json:"recheck_now"`
}
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// Get the latest available version from the Internet
func handleGetVersionJSON(w http.ResponseWriter, r *http.Request) {
if config.disableUpdate {
return
}
req := getVersionJSONRequest{}
err := json.NewDecoder(r.Body).Decode(&req)
if err != nil {
httpError(w, http.StatusBadRequest, "JSON parse: %s", err)
return
}
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now := time.Now()
if !req.RecheckNow {
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config.controlLock.Lock()
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cached := now.Sub(config.versionCheckLastTime) <= versionCheckPeriod && len(config.versionCheckJSON) != 0
data := config.versionCheckJSON
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config.controlLock.Unlock()
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if cached {
log.Tracef("Returning cached data")
w.Header().Set("Content-Type", "application/json")
w.Write(getVersionResp(data))
return
}
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}
var resp *http.Response
for i := 0; i != 3; i++ {
log.Tracef("Downloading data from %s", versionCheckURL)
resp, err = config.client.Get(versionCheckURL)
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
}
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if err != nil {
httpError(w, http.StatusBadGateway, "Couldn't get version check json from %s: %T %s\n", versionCheckURL, err, err)
return
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
httpError(w, http.StatusBadGateway, "Couldn't read response body from %s: %s", versionCheckURL, err)
return
}
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config.controlLock.Lock()
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config.versionCheckLastTime = now
config.versionCheckJSON = body
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config.controlLock.Unlock()
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(getVersionResp(body))
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't write body: %s", err)
}
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}
// Copy file on disk
func copyFile(src, dst string) error {
d, e := ioutil.ReadFile(src)
if e != nil {
return e
}
e = ioutil.WriteFile(dst, d, 0644)
if e != nil {
return e
}
return nil
}
type updateInfo struct {
pkgURL string // URL for the new package
pkgName string // Full path to package file
newVer string // New version string
updateDir string // Full path to the directory containing unpacked files from the new package
backupDir string // Full path to backup directory
configName string // Full path to the current configuration file
updateConfigName string // Full path to the configuration file to check by the new binary
curBinName string // Full path to the current executable file
bkpBinName string // Full path to the current executable file in backup directory
newBinName string // Full path to the new executable file
}
// Fill in updateInfo object
func getUpdateInfo(jsonData []byte) (*updateInfo, error) {
var u updateInfo
workDir := config.ourWorkingDir
versionJSON := make(map[string]interface{})
err := json.Unmarshal(jsonData, &versionJSON)
if err != nil {
return nil, fmt.Errorf("JSON parse: %s", err)
}
u.pkgURL = versionJSON[fmt.Sprintf("download_%s_%s", runtime.GOOS, runtime.GOARCH)].(string)
u.newVer = versionJSON["version"].(string)
if len(u.pkgURL) == 0 || len(u.newVer) == 0 {
return nil, fmt.Errorf("Invalid JSON")
}
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if u.newVer == versionString {
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return nil, fmt.Errorf("No need to update")
}
u.updateDir = filepath.Join(workDir, fmt.Sprintf("agh-update-%s", u.newVer))
u.backupDir = filepath.Join(workDir, "agh-backup")
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_, pkgFileName := filepath.Split(u.pkgURL)
if len(pkgFileName) == 0 {
return nil, fmt.Errorf("Invalid JSON")
}
u.pkgName = filepath.Join(u.updateDir, pkgFileName)
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u.configName = config.getConfigFilename()
u.updateConfigName = filepath.Join(u.updateDir, "AdGuardHome", "AdGuardHome.yaml")
if strings.HasSuffix(pkgFileName, ".zip") {
u.updateConfigName = filepath.Join(u.updateDir, "AdGuardHome.yaml")
}
binName := "AdGuardHome"
if runtime.GOOS == "windows" {
binName = "AdGuardHome.exe"
}
u.curBinName = filepath.Join(workDir, binName)
u.bkpBinName = filepath.Join(u.backupDir, binName)
u.newBinName = filepath.Join(u.updateDir, "AdGuardHome", binName)
if strings.HasSuffix(pkgFileName, ".zip") {
u.newBinName = filepath.Join(u.updateDir, binName)
}
return &u, nil
}
// Unpack all files from .zip file to the specified directory
// Existing files are overwritten
// Return the list of files (not directories) written
func zipFileUnpack(zipfile, outdir string) ([]string, error) {
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r, err := zip.OpenReader(zipfile)
if err != nil {
return nil, fmt.Errorf("zip.OpenReader(): %s", err)
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}
defer r.Close()
var files []string
var err2 error
var zr io.ReadCloser
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for _, zf := range r.File {
zr, err = zf.Open()
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if err != nil {
err2 = fmt.Errorf("zip file Open(): %s", err)
break
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}
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fi := zf.FileInfo()
if len(fi.Name()) == 0 {
continue
}
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fn := filepath.Join(outdir, fi.Name())
if fi.IsDir() {
err = os.Mkdir(fn, fi.Mode())
if err != nil && !os.IsExist(err) {
err2 = fmt.Errorf("os.Mkdir(): %s", err)
break
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}
log.Tracef("created directory %s", fn)
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continue
}
f, err := os.OpenFile(fn, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fi.Mode())
if err != nil {
err2 = fmt.Errorf("os.OpenFile(): %s", err)
break
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}
_, err = io.Copy(f, zr)
if err != nil {
f.Close()
err2 = fmt.Errorf("io.Copy(): %s", err)
break
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}
f.Close()
log.Tracef("created file %s", fn)
files = append(files, fi.Name())
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}
zr.Close()
return files, err2
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}
// Unpack all files from .tar.gz file to the specified directory
// Existing files are overwritten
// Return the list of files (not directories) written
func targzFileUnpack(tarfile, outdir string) ([]string, error) {
f, err := os.Open(tarfile)
if err != nil {
return nil, fmt.Errorf("os.Open(): %s", err)
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}
defer f.Close()
gzReader, err := gzip.NewReader(f)
if err != nil {
return nil, fmt.Errorf("gzip.NewReader(): %s", err)
}
var files []string
var err2 error
tarReader := tar.NewReader(gzReader)
for {
header, err := tarReader.Next()
if err == io.EOF {
err2 = nil
break
}
if err != nil {
err2 = fmt.Errorf("tarReader.Next(): %s", err)
break
}
if len(header.Name) == 0 {
continue
}
fn := filepath.Join(outdir, header.Name)
if header.Typeflag == tar.TypeDir {
err = os.Mkdir(fn, os.FileMode(header.Mode&0777))
if err != nil && !os.IsExist(err) {
err2 = fmt.Errorf("os.Mkdir(%s): %s", fn, err)
break
}
log.Tracef("created directory %s", fn)
continue
} else if header.Typeflag != tar.TypeReg {
log.Tracef("%s: unknown file type %d, skipping", header.Name, header.Typeflag)
continue
}
f, err := os.OpenFile(fn, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(header.Mode&0777))
if err != nil {
err2 = fmt.Errorf("os.OpenFile(%s): %s", fn, err)
break
}
_, err = io.Copy(f, tarReader)
if err != nil {
f.Close()
err2 = fmt.Errorf("io.Copy(): %s", err)
break
}
f.Close()
log.Tracef("created file %s", fn)
files = append(files, header.Name)
}
gzReader.Close()
return files, err2
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}
func copySupportingFiles(files []string, srcdir, dstdir string, useSrcNameOnly, useDstNameOnly bool) error {
for _, f := range files {
_, name := filepath.Split(f)
if name == "AdGuardHome" || name == "AdGuardHome.exe" || name == "AdGuardHome.yaml" {
continue
}
src := filepath.Join(srcdir, f)
if useSrcNameOnly {
src = filepath.Join(srcdir, name)
}
dst := filepath.Join(dstdir, f)
if useDstNameOnly {
dst = filepath.Join(dstdir, name)
}
err := copyFile(src, dst)
if err != nil && !os.IsNotExist(err) {
return err
}
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log.Tracef("Copied: %s -> %s", src, dst)
}
return nil
}
// Download package file and save it to disk
func getPackageFile(u *updateInfo) error {
resp, err := config.client.Get(u.pkgURL)
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if err != nil {
return fmt.Errorf("HTTP request failed: %s", err)
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
log.Tracef("Reading HTTP body")
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("ioutil.ReadAll() failed: %s", err)
}
log.Tracef("Saving package to file")
err = ioutil.WriteFile(u.pkgName, body, 0644)
if err != nil {
return fmt.Errorf("ioutil.WriteFile() failed: %s", err)
}
return nil
}
// Perform an update procedure
func doUpdate(u *updateInfo) error {
log.Info("Updating from %s to %s. URL:%s Package:%s",
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versionString, u.newVer, u.pkgURL, u.pkgName)
_ = os.Mkdir(u.updateDir, 0755)
var err error
err = getPackageFile(u)
if err != nil {
return err
}
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log.Tracef("Unpacking the package")
_, file := filepath.Split(u.pkgName)
var files []string
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if strings.HasSuffix(file, ".zip") {
files, err = zipFileUnpack(u.pkgName, u.updateDir)
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if err != nil {
return fmt.Errorf("zipFileUnpack() failed: %s", err)
}
} else if strings.HasSuffix(file, ".tar.gz") {
files, err = targzFileUnpack(u.pkgName, u.updateDir)
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if err != nil {
return fmt.Errorf("targzFileUnpack() failed: %s", err)
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}
} else {
return fmt.Errorf("Unknown package extension")
}
log.Tracef("Checking configuration")
err = copyFile(u.configName, u.updateConfigName)
if err != nil {
return fmt.Errorf("copyFile() failed: %s", err)
}
cmd := exec.Command(u.newBinName, "--check-config")
err = cmd.Run()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
return fmt.Errorf("exec.Command(): %s %d", err, cmd.ProcessState.ExitCode())
}
log.Tracef("Backing up the current configuration")
_ = os.Mkdir(u.backupDir, 0755)
err = copyFile(u.configName, filepath.Join(u.backupDir, "AdGuardHome.yaml"))
if err != nil {
return fmt.Errorf("copyFile() failed: %s", err)
}
// ./README.md -> backup/README.md
err = copySupportingFiles(files, config.ourWorkingDir, u.backupDir, true, true)
if err != nil {
return fmt.Errorf("copySupportingFiles(%s, %s) failed: %s",
config.ourWorkingDir, u.backupDir, err)
}
// update/[AdGuardHome/]README.md -> ./README.md
err = copySupportingFiles(files, u.updateDir, config.ourWorkingDir, false, true)
if err != nil {
return fmt.Errorf("copySupportingFiles(%s, %s) failed: %s",
u.updateDir, config.ourWorkingDir, err)
}
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log.Tracef("Renaming: %s -> %s", u.curBinName, u.bkpBinName)
err = os.Rename(u.curBinName, u.bkpBinName)
if err != nil {
return err
}
if runtime.GOOS == "windows" {
// rename fails with "File in use" error
err = copyFile(u.newBinName, u.curBinName)
} else {
err = os.Rename(u.newBinName, u.curBinName)
}
if err != nil {
return err
}
log.Tracef("Renamed: %s -> %s", u.newBinName, u.curBinName)
_ = os.Remove(u.pkgName)
_ = os.RemoveAll(u.updateDir)
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return nil
}
// Complete an update procedure
func finishUpdate(u *updateInfo) {
log.Info("Stopping all tasks")
cleanup()
stopHTTPServer()
cleanupAlways()
if runtime.GOOS == "windows" {
if config.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(u.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(u.curBinName, os.Args, os.Environ())
if err != nil {
log.Fatalf("syscall.Exec() failed: %s", err)
}
// Unreachable code
}
}
// Perform an update procedure to the latest available version
func handleUpdate(w http.ResponseWriter, r *http.Request) {
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if len(config.versionCheckJSON) == 0 {
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httpError(w, http.StatusBadRequest, "/update request isn't allowed now")
return
}
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u, err := getUpdateInfo(config.versionCheckJSON)
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if err != nil {
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
err = doUpdate(u)
if err != nil {
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
returnOK(w)
time.Sleep(time.Second) // wait (hopefully) until response is sent (not sure whether it's really necessary)
go finishUpdate(u)
}