287 lines
7.7 KiB
Go
287 lines
7.7 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"
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"net/http"
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"os/exec"
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"runtime"
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"strconv"
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"github.com/AdguardTeam/golibs/log"
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)
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type firstRunData struct {
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WebPort int `json:"web_port"`
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DNSPort int `json:"dns_port"`
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Interfaces map[string]interface{} `json:"interfaces"`
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}
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// Get initial installation settings
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func handleInstallGetAddresses(w http.ResponseWriter, r *http.Request) {
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data := firstRunData{}
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data.WebPort = 80
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data.DNSPort = 53
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ifaces, err := getValidNetInterfacesForWeb()
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't get interfaces: %s", err)
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return
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}
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data.Interfaces = make(map[string]interface{})
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for _, iface := range ifaces {
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data.Interfaces[iface.Name] = iface
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}
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w.Header().Set("Content-Type", "application/json")
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err = json.NewEncoder(w).Encode(data)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal default addresses to json: %s", err)
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return
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}
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}
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type checkConfigReqEnt struct {
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Port int `json:"port"`
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IP string `json:"ip"`
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Autofix bool `json:"autofix"`
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}
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type checkConfigReq struct {
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Web checkConfigReqEnt `json:"web"`
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DNS checkConfigReqEnt `json:"dns"`
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}
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type checkConfigRespEnt struct {
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Status string `json:"status"`
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CanAutofix bool `json:"can_autofix"`
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}
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type checkConfigResp struct {
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Web checkConfigRespEnt `json:"web"`
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DNS checkConfigRespEnt `json:"dns"`
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}
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// Check if ports are available, respond with results
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func handleInstallCheckConfig(w http.ResponseWriter, r *http.Request) {
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reqData := checkConfigReq{}
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respData := checkConfigResp{}
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err := json.NewDecoder(r.Body).Decode(&reqData)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to parse 'check_config' JSON data: %s", err)
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return
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}
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if reqData.Web.Port != 0 && reqData.Web.Port != config.BindPort {
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err = checkPortAvailable(reqData.Web.IP, reqData.Web.Port)
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if err != nil {
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respData.Web.Status = fmt.Sprintf("%v", err)
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}
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}
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if reqData.DNS.Port != 0 {
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err = checkPacketPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
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if errorIsAddrInUse(err) {
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canAutofix := checkDNSStubListener()
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if canAutofix && reqData.DNS.Autofix {
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err = disableDNSStubListener()
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if err != nil {
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log.Error("Couldn't disable DNSStubListener: %s", err)
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}
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err = checkPacketPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
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canAutofix = false
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}
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respData.DNS.CanAutofix = canAutofix
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}
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if err == nil {
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err = checkPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
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}
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if err != nil {
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respData.DNS.Status = fmt.Sprintf("%v", err)
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}
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}
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w.Header().Set("Content-Type", "application/json")
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err = json.NewEncoder(w).Encode(respData)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal JSON: %s", err)
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return
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}
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}
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// Check if DNSStubListener is active
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func checkDNSStubListener() bool {
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if runtime.GOOS != "linux" {
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return false
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}
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cmd := exec.Command("systemctl", "is-enabled", "systemd-resolved")
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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_, err := cmd.Output()
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if err != nil || cmd.ProcessState.ExitCode() != 0 {
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log.Error("command %s has failed: %v code:%d",
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cmd.Path, err, cmd.ProcessState.ExitCode())
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return false
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}
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cmd = exec.Command("grep", "-E", "#?DNSStubListener=yes", "/etc/systemd/resolved.conf")
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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_, err = cmd.Output()
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if err != nil || cmd.ProcessState.ExitCode() != 0 {
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log.Error("command %s has failed: %v code:%d",
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cmd.Path, err, cmd.ProcessState.ExitCode())
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return false
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}
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return true
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}
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// Deactivate DNSStubListener
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func disableDNSStubListener() error {
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cmd := exec.Command("sed", "-r", "-i.orig", "s/#?DNSStubListener=yes/DNSStubListener=no/g", "/etc/systemd/resolved.conf")
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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_, err := cmd.Output()
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if err != nil {
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return err
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}
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if cmd.ProcessState.ExitCode() != 0 {
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return fmt.Errorf("process %s exited with an error: %d",
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cmd.Path, cmd.ProcessState.ExitCode())
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}
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cmd = exec.Command("systemctl", "reload-or-restart", "systemd-resolved")
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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_, err = cmd.Output()
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if err != nil {
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return err
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}
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if cmd.ProcessState.ExitCode() != 0 {
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return fmt.Errorf("process %s exited with an error: %d",
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cmd.Path, cmd.ProcessState.ExitCode())
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}
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return nil
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}
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type applyConfigReqEnt struct {
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IP string `json:"ip"`
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Port int `json:"port"`
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}
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type applyConfigReq struct {
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Web applyConfigReqEnt `json:"web"`
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DNS applyConfigReqEnt `json:"dns"`
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Username string `json:"username"`
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Password string `json:"password"`
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}
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// Copy installation parameters between two configuration objects
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func copyInstallSettings(dst *configuration, src *configuration) {
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dst.BindHost = src.BindHost
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dst.BindPort = src.BindPort
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dst.DNS.BindHost = src.DNS.BindHost
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dst.DNS.Port = src.DNS.Port
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}
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// Apply new configuration, start DNS server, restart Web server
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func handleInstallConfigure(w http.ResponseWriter, r *http.Request) {
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newSettings := applyConfigReq{}
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err := json.NewDecoder(r.Body).Decode(&newSettings)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to parse 'configure' JSON: %s", err)
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return
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}
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if newSettings.Web.Port == 0 || newSettings.DNS.Port == 0 {
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httpError(w, http.StatusBadRequest, "port value can't be 0")
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return
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}
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restartHTTP := true
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if config.BindHost == newSettings.Web.IP && config.BindPort == newSettings.Web.Port {
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// no need to rebind
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restartHTTP = false
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}
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// validate that hosts and ports are bindable
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if restartHTTP {
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err = checkPortAvailable(newSettings.Web.IP, newSettings.Web.Port)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Impossible to listen on IP:port %s due to %s",
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net.JoinHostPort(newSettings.Web.IP, strconv.Itoa(newSettings.Web.Port)), err)
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return
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}
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}
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err = checkPacketPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
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if err != nil {
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httpError(w, http.StatusBadRequest, "%s", err)
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return
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}
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err = checkPortAvailable(newSettings.DNS.IP, newSettings.DNS.Port)
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if err != nil {
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httpError(w, http.StatusBadRequest, "%s", err)
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return
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}
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var curConfig configuration
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copyInstallSettings(&curConfig, &config)
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config.firstRun = false
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config.BindHost = newSettings.Web.IP
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config.BindPort = newSettings.Web.Port
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config.DNS.BindHost = newSettings.DNS.IP
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config.DNS.Port = newSettings.DNS.Port
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err = initDNSServer()
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var err2 error
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if err == nil {
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err2 = startDNSServer()
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}
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if err != nil || err2 != nil {
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config.firstRun = true
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copyInstallSettings(&config, &curConfig)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Couldn't initialize DNS server: %s", err)
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} else {
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httpError(w, http.StatusInternalServerError, "Couldn't start DNS server: %s", err2)
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}
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return
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}
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u := User{}
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u.Name = newSettings.Username
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config.auth.UserAdd(&u, newSettings.Password)
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err = config.write()
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if err != nil {
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config.firstRun = true
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copyInstallSettings(&config, &curConfig)
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httpError(w, http.StatusInternalServerError, "Couldn't write config: %s", err)
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return
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}
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// this needs to be done in a goroutine because Shutdown() is a blocking call, and it will block
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// until all requests are finished, and _we_ are inside a request right now, so it will block indefinitely
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if restartHTTP {
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go func() {
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_ = Context.httpServer.Shutdown(context.TODO())
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}()
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}
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returnOK(w)
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}
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func registerInstallHandlers() {
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http.HandleFunc("/control/install/get_addresses", preInstall(ensureGET(handleInstallGetAddresses)))
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http.HandleFunc("/control/install/check_config", preInstall(ensurePOST(handleInstallCheckConfig)))
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http.HandleFunc("/control/install/configure", preInstall(ensurePOST(handleInstallConfigure)))
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}
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