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controlinstall.go
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controlinstall.go
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package home
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
"github.com/AdguardTeam/AdGuardHome/internal/agherr"
"github.com/AdguardTeam/AdGuardHome/internal/aghnet"
"github.com/AdguardTeam/golibs/log"
)
// getAddrsResponse is the response for /install/get_addresses endpoint.
type getAddrsResponse struct {
WebPort int `json:"web_port"`
DNSPort int `json:"dns_port"`
Interfaces map[string]*aghnet.NetInterface `json:"interfaces"`
}
// handleInstallGetAddresses is the handler for /install/get_addresses endpoint.
func (web *Web) handleInstallGetAddresses(w http.ResponseWriter, r *http.Request) {
data := getAddrsResponse{}
data.WebPort = 80
data.DNSPort = 53
ifaces, err := aghnet.GetValidNetInterfacesForWeb()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't get interfaces: %s", err)
return
}
data.Interfaces = make(map[string]*aghnet.NetInterface)
for _, iface := range ifaces {
data.Interfaces[iface.Name] = iface
}
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(data)
if err != nil {
httpError(w, http.StatusInternalServerError, "Unable to marshal default addresses to json: %s", err)
return
}
}
type checkConfigReqEnt struct {
Port int `json:"port"`
IP net.IP `json:"ip"`
Autofix bool `json:"autofix"`
}
type checkConfigReq struct {
Web checkConfigReqEnt `json:"web"`
DNS checkConfigReqEnt `json:"dns"`
SetStaticIP bool `json:"set_static_ip"`
}
type checkConfigRespEnt struct {
Status string `json:"status"`
CanAutofix bool `json:"can_autofix"`
}
type staticIPJSON struct {
Static string `json:"static"`
IP string `json:"ip"`
Error string `json:"error"`
}
type checkConfigResp struct {
Web checkConfigRespEnt `json:"web"`
DNS checkConfigRespEnt `json:"dns"`
StaticIP staticIPJSON `json:"static_ip"`
}
// Check if ports are available, respond with results
func (web *Web) handleInstallCheckConfig(w http.ResponseWriter, r *http.Request) {
reqData := checkConfigReq{}
respData := checkConfigResp{}
err := json.NewDecoder(r.Body).Decode(&reqData)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse 'check_config' JSON data: %s", err)
return
}
if reqData.Web.Port != 0 && reqData.Web.Port != config.BindPort && reqData.Web.Port != config.BetaBindPort {
err = aghnet.CheckPortAvailable(reqData.Web.IP, reqData.Web.Port)
if err != nil {
respData.Web.Status = err.Error()
}
}
if reqData.DNS.Port != 0 {
err = aghnet.CheckPacketPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
if aghnet.ErrorIsAddrInUse(err) {
canAutofix := checkDNSStubListener()
if canAutofix && reqData.DNS.Autofix {
err = disableDNSStubListener()
if err != nil {
log.Error("Couldn't disable DNSStubListener: %s", err)
}
err = aghnet.CheckPacketPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
canAutofix = false
}
respData.DNS.CanAutofix = canAutofix
}
if err == nil {
err = aghnet.CheckPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
}
if err != nil {
respData.DNS.Status = err.Error()
} else if !reqData.DNS.IP.IsUnspecified() {
respData.StaticIP = handleStaticIP(reqData.DNS.IP, reqData.SetStaticIP)
}
}
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(respData)
if err != nil {
httpError(w, http.StatusInternalServerError, "Unable to marshal JSON: %s", err)
return
}
}
// handleStaticIP - handles static IP request
// It either checks if we have a static IP
// Or if set=true, it tries to set it
func handleStaticIP(ip net.IP, set bool) staticIPJSON {
resp := staticIPJSON{}
interfaceName := aghnet.GetInterfaceByIP(ip)
resp.Static = "no"
if len(interfaceName) == 0 {
resp.Static = "error"
resp.Error = fmt.Sprintf("Couldn't find network interface by IP %s", ip)
return resp
}
if set {
// Try to set static IP for the specified interface
err := aghnet.IfaceSetStaticIP(interfaceName)
if err != nil {
resp.Static = "error"
resp.Error = err.Error()
return resp
}
}
// Fallthrough here even if we set static IP
// Check if we have a static IP and return the details
isStaticIP, err := aghnet.IfaceHasStaticIP(interfaceName)
if err != nil {
resp.Static = "error"
resp.Error = err.Error()
} else {
if isStaticIP {
resp.Static = "yes"
}
resp.IP = aghnet.GetSubnet(interfaceName).String()
}
return resp
}
// Check if DNSStubListener is active
func checkDNSStubListener() bool {
if runtime.GOOS != "linux" {
return false
}
cmd := exec.Command("systemctl", "is-enabled", "systemd-resolved")
log.Tracef("executing %s %v", cmd.Path, cmd.Args)
_, err := cmd.Output()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
log.Info("command %s has failed: %v code:%d",
cmd.Path, err, cmd.ProcessState.ExitCode())
return false
}
cmd = exec.Command("grep", "-E", "#?DNSStubListener=yes", "/etc/systemd/resolved.conf")
log.Tracef("executing %s %v", cmd.Path, cmd.Args)
_, err = cmd.Output()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
log.Info("command %s has failed: %v code:%d",
cmd.Path, err, cmd.ProcessState.ExitCode())
return false
}
return true
}
const (
resolvedConfPath = "/etc/systemd/resolved.conf.d/adguardhome.conf"
resolvedConfData = `[Resolve]
DNS=127.0.0.1
DNSStubListener=no
`
)
const resolvConfPath = "/etc/resolv.conf"
// Deactivate DNSStubListener
func disableDNSStubListener() error {
dir := filepath.Dir(resolvedConfPath)
err := os.MkdirAll(dir, 0o755)
if err != nil {
return fmt.Errorf("os.MkdirAll: %s: %w", dir, err)
}
err = ioutil.WriteFile(resolvedConfPath, []byte(resolvedConfData), 0o644)
if err != nil {
return fmt.Errorf("ioutil.WriteFile: %s: %w", resolvedConfPath, err)
}
_ = os.Rename(resolvConfPath, resolvConfPath+".backup")
err = os.Symlink("/run/systemd/resolve/resolv.conf", resolvConfPath)
if err != nil {
_ = os.Remove(resolvedConfPath) // remove the file we've just created
return fmt.Errorf("os.Symlink: %s: %w", resolvConfPath, err)
}
cmd := exec.Command("systemctl", "reload-or-restart", "systemd-resolved")
log.Tracef("executing %s %v", cmd.Path, cmd.Args)
_, err = cmd.Output()
if err != nil {
return err
}
if cmd.ProcessState.ExitCode() != 0 {
return fmt.Errorf("process %s exited with an error: %d",
cmd.Path, cmd.ProcessState.ExitCode())
}
return nil
}
type applyConfigReqEnt struct {
IP net.IP `json:"ip"`
Port int `json:"port"`
}
type applyConfigReq struct {
Web applyConfigReqEnt `json:"web"`
DNS applyConfigReqEnt `json:"dns"`
Username string `json:"username"`
Password string `json:"password"`
}
// Copy installation parameters between two configuration objects
func copyInstallSettings(dst, src *configuration) {
dst.BindHost = src.BindHost
dst.BindPort = src.BindPort
dst.BetaBindPort = src.BetaBindPort
dst.DNS.BindHosts = src.DNS.BindHosts
dst.DNS.Port = src.DNS.Port
}
// shutdownTimeout is the timeout for shutting HTTP server down operation.
const shutdownTimeout = 5 * time.Second
func shutdownSrv(ctx context.Context, cancel context.CancelFunc, srv *http.Server) {
defer agherr.LogPanic("")
if srv == nil {
return
}
defer cancel()
err := srv.Shutdown(ctx)
if err != nil {
log.Error("error while shutting down http server %q: %s", srv.Addr, err)
}
}
// Apply new configuration, start DNS server, restart Web server
func (web *Web) handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
newSettings := applyConfigReq{}
err := json.NewDecoder(r.Body).Decode(&newSettings)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse 'configure' JSON: %s", err)
return
}
if newSettings.Web.Port == 0 || newSettings.DNS.Port == 0 {
httpError(w, http.StatusBadRequest, "port value can't be 0")
return
}
restartHTTP := true
if config.BindHost.Equal(newSettings.Web.IP) && config.BindPort == newSettings.Web.Port {
// no need to rebind
restartHTTP = false
}
// validate that hosts and ports are bindable
if restartHTTP {
err = aghnet.CheckPortAvailable(newSettings.Web.IP, newSettings.Web.Port)
if err != nil {
httpError(w, http.StatusBadRequest, "Impossible to listen on IP:port %s due to %s",
net.JoinHostPort(newSettings.Web.IP.String(), strconv.Itoa(newSettings.Web.Port)), err)
return
}
}
err = aghnet.CheckPacketPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
if err != nil {
httpError(w, http.StatusBadRequest, "%s", err)
return
}
err = aghnet.CheckPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
if err != nil {
httpError(w, http.StatusBadRequest, "%s", err)
return
}
var curConfig configuration
copyInstallSettings(&curConfig, &config)
Context.firstRun = false
config.BindHost = newSettings.Web.IP
config.BindPort = newSettings.Web.Port
config.DNS.BindHosts = []net.IP{newSettings.DNS.IP}
config.DNS.Port = newSettings.DNS.Port
// TODO(e.burkov): StartMods() should be put in a separate goroutine at
// the moment we'll allow setting up TLS in the initial configuration or
// the configuration itself will use HTTPS protocol, because the
// underlying functions potentially restart the HTTPS server.
err = StartMods()
if err != nil {
Context.firstRun = true
copyInstallSettings(&config, &curConfig)
httpError(w, http.StatusInternalServerError, "%s", err)
return
}
u := User{}
u.Name = newSettings.Username
Context.auth.UserAdd(&u, newSettings.Password)
err = config.write()
if err != nil {
Context.firstRun = true
copyInstallSettings(&config, &curConfig)
httpError(w, http.StatusInternalServerError, "Couldn't write config: %s", err)
return
}
web.conf.firstRun = false
web.conf.BindHost = newSettings.Web.IP
web.conf.BindPort = newSettings.Web.Port
registerControlHandlers()
returnOK(w)
if f, ok := w.(http.Flusher); ok {
f.Flush()
}
// Method http.(*Server).Shutdown needs to be called in a separate
// goroutine and with its own context, because it waits until all
// requests are handled and will be blocked by it's own caller.
if restartHTTP {
ctx, cancel := context.WithTimeout(context.Background(), shutdownTimeout)
go shutdownSrv(ctx, cancel, web.httpServer)
go shutdownSrv(ctx, cancel, web.httpServerBeta)
}
}
func (web *Web) registerInstallHandlers() {
Context.mux.HandleFunc("/control/install/get_addresses", preInstall(ensureGET(web.handleInstallGetAddresses)))
Context.mux.HandleFunc("/control/install/check_config", preInstall(ensurePOST(web.handleInstallCheckConfig)))
Context.mux.HandleFunc("/control/install/configure", preInstall(ensurePOST(web.handleInstallConfigure)))
}
// checkConfigReqEntBeta is a struct representing new client's config check
// request entry. It supports multiple IP values unlike the checkConfigReqEnt.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default checkConfigReqEnt.
type checkConfigReqEntBeta struct {
Port int `json:"port"`
IP []net.IP `json:"ip"`
Autofix bool `json:"autofix"`
}
// checkConfigReqBeta is a struct representing new client's config check request
// body. It uses checkConfigReqEntBeta instead of checkConfigReqEnt.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default checkConfigReq.
type checkConfigReqBeta struct {
Web checkConfigReqEntBeta `json:"web"`
DNS checkConfigReqEntBeta `json:"dns"`
SetStaticIP bool `json:"set_static_ip"`
}
// handleInstallCheckConfigBeta is a substitution of /install/check_config
// handler for new client.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default handleInstallCheckConfig.
func (web *Web) handleInstallCheckConfigBeta(w http.ResponseWriter, r *http.Request) {
reqData := checkConfigReqBeta{}
err := json.NewDecoder(r.Body).Decode(&reqData)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse 'check_config' JSON data: %s", err)
return
}
if len(reqData.DNS.IP) == 0 || len(reqData.Web.IP) == 0 {
httpError(w, http.StatusBadRequest, http.StatusText(http.StatusBadRequest))
return
}
nonBetaReqData := checkConfigReq{
Web: checkConfigReqEnt{
Port: reqData.Web.Port,
IP: reqData.Web.IP[0],
Autofix: reqData.Web.Autofix,
},
DNS: checkConfigReqEnt{
Port: reqData.DNS.Port,
IP: reqData.DNS.IP[0],
Autofix: reqData.DNS.Autofix,
},
SetStaticIP: reqData.SetStaticIP,
}
nonBetaReqBody := &strings.Builder{}
err = json.NewEncoder(nonBetaReqBody).Encode(nonBetaReqData)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to encode 'check_config' JSON data: %s", err)
return
}
body := nonBetaReqBody.String()
r.Body = ioutil.NopCloser(strings.NewReader(body))
r.ContentLength = int64(len(body))
web.handleInstallCheckConfig(w, r)
}
// applyConfigReqEntBeta is a struct representing new client's config setting
// request entry. It supports multiple IP values unlike the applyConfigReqEnt.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default applyConfigReqEnt.
type applyConfigReqEntBeta struct {
IP []net.IP `json:"ip"`
Port int `json:"port"`
}
// applyConfigReqBeta is a struct representing new client's config setting
// request body. It uses applyConfigReqEntBeta instead of applyConfigReqEnt.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default applyConfigReq.
type applyConfigReqBeta struct {
Web applyConfigReqEntBeta `json:"web"`
DNS applyConfigReqEntBeta `json:"dns"`
Username string `json:"username"`
Password string `json:"password"`
}
// handleInstallConfigureBeta is a substitution of /install/configure handler
// for new client.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default handleInstallConfigure.
func (web *Web) handleInstallConfigureBeta(w http.ResponseWriter, r *http.Request) {
reqData := applyConfigReqBeta{}
err := json.NewDecoder(r.Body).Decode(&reqData)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to parse 'check_config' JSON data: %s", err)
return
}
if len(reqData.DNS.IP) == 0 || len(reqData.Web.IP) == 0 {
httpError(w, http.StatusBadRequest, http.StatusText(http.StatusBadRequest))
return
}
nonBetaReqData := applyConfigReq{
Web: applyConfigReqEnt{
IP: reqData.Web.IP[0],
Port: reqData.Web.Port,
},
DNS: applyConfigReqEnt{
IP: reqData.DNS.IP[0],
Port: reqData.DNS.Port,
},
Username: reqData.Username,
Password: reqData.Password,
}
nonBetaReqBody := &strings.Builder{}
err = json.NewEncoder(nonBetaReqBody).Encode(nonBetaReqData)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to encode 'check_config' JSON data: %s", err)
return
}
body := nonBetaReqBody.String()
r.Body = ioutil.NopCloser(strings.NewReader(body))
r.ContentLength = int64(len(body))
web.handleInstallConfigure(w, r)
}
// getAddrsResponseBeta is a struct representing new client's getting addresses
// request body. It uses array of structs instead of map.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default firstRunData.
type getAddrsResponseBeta struct {
WebPort int `json:"web_port"`
DNSPort int `json:"dns_port"`
Interfaces []*aghnet.NetInterface `json:"interfaces"`
}
// handleInstallConfigureBeta is a substitution of /install/get_addresses
// handler for new client.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default handleInstallGetAddresses.
func (web *Web) handleInstallGetAddressesBeta(w http.ResponseWriter, r *http.Request) {
data := getAddrsResponseBeta{}
data.WebPort = 80
data.DNSPort = 53
ifaces, err := aghnet.GetValidNetInterfacesForWeb()
if err != nil {
httpError(w, http.StatusInternalServerError, "Couldn't get interfaces: %s", err)
return
}
data.Interfaces = ifaces
w.Header().Set("Content-Type", "application/json")
err = json.NewEncoder(w).Encode(data)
if err != nil {
httpError(w, http.StatusInternalServerError, "Unable to marshal default addresses to json: %s", err)
return
}
}
// registerBetaInstallHandlers registers the install handlers for new client
// with the structures it supports.
//
// TODO(e.burkov): This should removed with the API v1 when the appropriate
// functionality will appear in default handlers.
func (web *Web) registerBetaInstallHandlers() {
Context.mux.HandleFunc("/control/install/get_addresses_beta", preInstall(ensureGET(web.handleInstallGetAddressesBeta)))
Context.mux.HandleFunc("/control/install/check_config_beta", preInstall(ensurePOST(web.handleInstallCheckConfigBeta)))
Context.mux.HandleFunc("/control/install/configure_beta", preInstall(ensurePOST(web.handleInstallConfigureBeta)))
}