mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-26 23:28:08 +03:00
365 lines
9.8 KiB
Go
365 lines
9.8 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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"io/ioutil"
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"net"
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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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"strconv"
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"github.com/AdguardTeam/AdGuardHome/util"
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"github.com/AdguardTeam/AdGuardHome/dhcpd"
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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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type netInterfaceJSON struct {
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Name string `json:"name"`
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MTU int `json:"mtu"`
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HardwareAddr string `json:"hardware_address"`
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Addresses []string `json:"ip_addresses"`
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Flags string `json:"flags"`
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}
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// Get initial installation settings
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func (web *Web) 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 := util.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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ifaceJSON := netInterfaceJSON{
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Name: iface.Name,
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MTU: iface.MTU,
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HardwareAddr: iface.HardwareAddr,
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Addresses: iface.Addresses,
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Flags: iface.Flags,
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}
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data.Interfaces[iface.Name] = ifaceJSON
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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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SetStaticIP bool `json:"set_static_ip"`
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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 staticIPJSON struct {
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Static string `json:"static"`
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IP string `json:"ip"`
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Error string `json:"error"`
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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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StaticIP staticIPJSON `json:"static_ip"`
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}
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// Check if ports are available, respond with results
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func (web *Web) 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 = util.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 = util.CheckPacketPortAvailable(reqData.DNS.IP, reqData.DNS.Port)
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if util.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 = util.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 = util.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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} else {
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respData.StaticIP = handleStaticIP(reqData.DNS.IP, reqData.SetStaticIP)
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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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// handleStaticIP - handles static IP request
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// It either checks if we have a static IP
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// Or if set=true, it tries to set it
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func handleStaticIP(ip string, set bool) staticIPJSON {
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resp := staticIPJSON{}
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interfaceName := util.GetInterfaceByIP(ip)
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resp.Static = "no"
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if len(interfaceName) == 0 {
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resp.Static = "error"
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resp.Error = fmt.Sprintf("Couldn't find network interface by IP %s", ip)
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return resp
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}
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if set {
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// Try to set static IP for the specified interface
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err := dhcpd.SetStaticIP(interfaceName)
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if err != nil {
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resp.Static = "error"
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resp.Error = err.Error()
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return resp
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}
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}
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// Fallthrough here even if we set static IP
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// Check if we have a static IP and return the details
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isStaticIP, err := dhcpd.HasStaticIP(interfaceName)
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if err != nil {
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resp.Static = "error"
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resp.Error = err.Error()
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} else {
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if isStaticIP {
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resp.Static = "yes"
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}
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resp.IP = util.GetSubnet(interfaceName)
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}
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return resp
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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.Info("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.Info("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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const resolvedConfPath = "/etc/systemd/resolved.conf.d/adguardhome.conf"
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const resolvedConfData = `[Resolve]
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DNS=127.0.0.1
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DNSStubListener=no
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`
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const resolvConfPath = "/etc/resolv.conf"
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// Deactivate DNSStubListener
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func disableDNSStubListener() error {
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dir := filepath.Dir(resolvedConfPath)
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err := os.MkdirAll(dir, 0755)
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if err != nil {
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return fmt.Errorf("os.MkdirAll: %s: %s", dir, err)
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}
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err = ioutil.WriteFile(resolvedConfPath, []byte(resolvedConfData), 0644)
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if err != nil {
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return fmt.Errorf("ioutil.WriteFile: %s: %s", resolvedConfPath, err)
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}
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_ = os.Rename(resolvConfPath, resolvConfPath+".backup")
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err = os.Symlink("/run/systemd/resolve/resolv.conf", resolvConfPath)
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if err != nil {
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_ = os.Remove(resolvedConfPath) // remove the file we've just created
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return fmt.Errorf("os.Symlink: %s: %s", resolvConfPath, err)
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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 (web *Web) 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 = util.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 = util.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 = util.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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Context.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 = StartMods()
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if err != nil {
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Context.firstRun = true
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copyInstallSettings(&config, &curConfig)
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httpError(w, http.StatusInternalServerError, "%s", err)
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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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Context.auth.UserAdd(&u, newSettings.Password)
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err = config.write()
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if err != nil {
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Context.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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registerControlHandlers()
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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.web.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 (web *Web) registerInstallHandlers() {
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http.HandleFunc("/control/install/get_addresses", preInstall(ensureGET(web.handleInstallGetAddresses)))
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http.HandleFunc("/control/install/check_config", preInstall(ensurePOST(web.handleInstallCheckConfig)))
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http.HandleFunc("/control/install/configure", preInstall(ensurePOST(web.handleInstallConfigure)))
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}
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