package main import ( "encoding/json" "fmt" "io/ioutil" "net" "net/http" "strings" "time" "github.com/AdguardTeam/AdGuardHome/dhcpd" "github.com/AdguardTeam/golibs/log" "github.com/joomcode/errorx" ) var dhcpServer = dhcpd.Server{} func handleDHCPStatus(w http.ResponseWriter, r *http.Request) { log.Tracef("%s %v", r.Method, r.URL) rawLeases := dhcpServer.Leases() leases := []map[string]string{} for i := range rawLeases { lease := map[string]string{ "mac": rawLeases[i].HWAddr.String(), "ip": rawLeases[i].IP.String(), "hostname": rawLeases[i].Hostname, "expires": rawLeases[i].Expiry.Format(time.RFC3339), } leases = append(leases, lease) } status := map[string]interface{}{ "config": config.DHCP, "leases": leases, } w.Header().Set("Content-Type", "application/json") err := json.NewEncoder(w).Encode(status) if err != nil { httpError(w, http.StatusInternalServerError, "Unable to marshal DHCP status json: %s", err) return } } func handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) { log.Tracef("%s %v", r.Method, r.URL) newconfig := dhcpd.ServerConfig{} err := json.NewDecoder(r.Body).Decode(&newconfig) if err != nil { httpError(w, http.StatusBadRequest, "Failed to parse new DHCP config json: %s", err) return } err = dhcpServer.Stop() if err != nil { log.Error("failed to stop the DHCP server: %s", err) } if newconfig.Enabled { err := dhcpServer.Start(&newconfig) if err != nil { httpError(w, http.StatusBadRequest, "Failed to start DHCP server: %s", err) return } } config.DHCP = newconfig httpUpdateConfigReloadDNSReturnOK(w, r) } func handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) { log.Tracef("%s %v", r.Method, r.URL) response := map[string]interface{}{} ifaces, err := getValidNetInterfaces() if err != nil { httpError(w, http.StatusInternalServerError, "Couldn't get interfaces: %s", err) return } for _, iface := range ifaces { if iface.Flags&net.FlagLoopback != 0 { // it's a loopback, skip it continue } if iface.Flags&net.FlagBroadcast == 0 { // this interface doesn't support broadcast, skip it continue } addrs, err := iface.Addrs() if err != nil { httpError(w, http.StatusInternalServerError, "Failed to get addresses for interface %s: %s", iface.Name, err) return } jsonIface := netInterface{ Name: iface.Name, MTU: iface.MTU, HardwareAddr: iface.HardwareAddr.String(), } if iface.Flags != 0 { jsonIface.Flags = iface.Flags.String() } // we don't want link-local addresses in json, so skip them for _, addr := range addrs { ipnet, ok := addr.(*net.IPNet) if !ok { // not an IPNet, should not happen httpError(w, http.StatusInternalServerError, "SHOULD NOT HAPPEN: got iface.Addrs() element %s that is not net.IPNet, it is %T", addr, addr) return } // ignore link-local if ipnet.IP.IsLinkLocalUnicast() { continue } jsonIface.Addresses = append(jsonIface.Addresses, ipnet.IP.String()) } if len(jsonIface.Addresses) != 0 { response[iface.Name] = jsonIface } } err = json.NewEncoder(w).Encode(response) if err != nil { httpError(w, http.StatusInternalServerError, "Failed to marshal json with available interfaces: %s", err) return } } func handleDHCPFindActiveServer(w http.ResponseWriter, r *http.Request) { log.Tracef("%s %v", r.Method, r.URL) body, err := ioutil.ReadAll(r.Body) if err != nil { errorText := fmt.Sprintf("failed to read request body: %s", err) log.Error(errorText) http.Error(w, errorText, http.StatusBadRequest) return } interfaceName := strings.TrimSpace(string(body)) if interfaceName == "" { errorText := fmt.Sprintf("empty interface name specified") log.Error(errorText) http.Error(w, errorText, http.StatusBadRequest) return } found, err := dhcpd.CheckIfOtherDHCPServersPresent(interfaceName) result := map[string]interface{}{} if err != nil { result["error"] = err.Error() } else { result["found"] = found } w.Header().Set("Content-Type", "application/json") err = json.NewEncoder(w).Encode(result) if err != nil { httpError(w, http.StatusInternalServerError, "Failed to marshal DHCP found json: %s", err) return } } func startDHCPServer() error { if !config.DHCP.Enabled { // not enabled, don't do anything return nil } err := dhcpServer.Start(&config.DHCP) if err != nil { return errorx.Decorate(err, "Couldn't start DHCP server") } return nil } func stopDHCPServer() error { if !config.DHCP.Enabled { return nil } if !dhcpServer.Enabled { return nil } err := dhcpServer.Stop() if err != nil { return errorx.Decorate(err, "Couldn't stop DHCP server") } return nil }