460 lines
11 KiB
Go
460 lines
11 KiB
Go
package home
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import (
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"encoding/json"
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"errors"
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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/exec"
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"runtime"
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"strings"
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"time"
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"github.com/AdguardTeam/AdGuardHome/dhcpd"
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"github.com/AdguardTeam/golibs/file"
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"github.com/AdguardTeam/golibs/log"
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"github.com/joomcode/errorx"
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)
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// []dhcpd.Lease -> JSON
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func convertLeases(inputLeases []dhcpd.Lease, includeExpires bool) []map[string]string {
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leases := []map[string]string{}
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for _, l := range inputLeases {
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lease := map[string]string{
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"mac": l.HWAddr.String(),
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"ip": l.IP.String(),
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"hostname": l.Hostname,
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}
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if includeExpires {
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lease["expires"] = l.Expiry.Format(time.RFC3339)
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}
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leases = append(leases, lease)
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}
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return leases
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}
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func handleDHCPStatus(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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leases := convertLeases(config.dhcpServer.Leases(), true)
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staticLeases := convertLeases(config.dhcpServer.StaticLeases(), false)
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status := map[string]interface{}{
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"config": config.DHCP,
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"leases": leases,
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"static_leases": staticLeases,
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}
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w.Header().Set("Content-Type", "application/json")
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err := json.NewEncoder(w).Encode(status)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Unable to marshal DHCP status json: %s", err)
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return
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}
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}
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type leaseJSON struct {
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HWAddr string `json:"mac"`
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IP string `json:"ip"`
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Hostname string `json:"hostname"`
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}
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type dhcpServerConfigJSON struct {
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dhcpd.ServerConfig `json:",inline"`
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StaticLeases []leaseJSON `json:"static_leases"`
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}
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func handleDHCPSetConfig(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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newconfig := dhcpServerConfigJSON{}
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err := json.NewDecoder(r.Body).Decode(&newconfig)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to parse new DHCP config json: %s", err)
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return
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}
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newconfig.ServerConfig.WorkDir = config.ourWorkingDir
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err = config.dhcpServer.CheckConfig(newconfig.ServerConfig)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Invalid DHCP configuration: %s", err)
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return
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}
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err = config.dhcpServer.Stop()
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if err != nil {
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log.Error("failed to stop the DHCP server: %s", err)
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}
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err = config.dhcpServer.Init(newconfig.ServerConfig)
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if err != nil {
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httpError(w, http.StatusBadRequest, "Invalid DHCP configuration: %s", err)
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return
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}
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if newconfig.Enabled {
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staticIP, err := hasStaticIP(newconfig.InterfaceName)
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if !staticIP && err == nil {
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err = setStaticIP(newconfig.InterfaceName)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Failed to configure static IP: %s", err)
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return
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}
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}
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err = config.dhcpServer.Start()
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if err != nil {
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httpError(w, http.StatusBadRequest, "Failed to start DHCP server: %s", err)
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return
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}
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}
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config.DHCP = newconfig.ServerConfig
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httpUpdateConfigReloadDNSReturnOK(w, r)
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}
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func handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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response := map[string]interface{}{}
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ifaces, err := getValidNetInterfaces()
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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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for _, iface := range ifaces {
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if iface.Flags&net.FlagLoopback != 0 {
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// it's a loopback, skip it
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continue
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}
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if iface.Flags&net.FlagBroadcast == 0 {
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// this interface doesn't support broadcast, skip it
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continue
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}
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addrs, err := iface.Addrs()
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Failed to get addresses for interface %s: %s", iface.Name, err)
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return
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}
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jsonIface := netInterface{
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Name: iface.Name,
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MTU: iface.MTU,
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HardwareAddr: iface.HardwareAddr.String(),
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}
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if iface.Flags != 0 {
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jsonIface.Flags = iface.Flags.String()
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}
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// we don't want link-local addresses in json, so skip them
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for _, addr := range addrs {
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ipnet, ok := addr.(*net.IPNet)
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if !ok {
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// not an IPNet, should not happen
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httpError(w, http.StatusInternalServerError, "SHOULD NOT HAPPEN: got iface.Addrs() element %s that is not net.IPNet, it is %T", addr, addr)
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return
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}
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// ignore link-local
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if ipnet.IP.IsLinkLocalUnicast() {
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continue
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}
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jsonIface.Addresses = append(jsonIface.Addresses, ipnet.IP.String())
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}
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if len(jsonIface.Addresses) != 0 {
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response[iface.Name] = jsonIface
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}
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}
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err = json.NewEncoder(w).Encode(response)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Failed to marshal json with available interfaces: %s", err)
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return
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}
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}
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// Perform the following tasks:
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// . Search for another DHCP server running
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// . Check if a static IP is configured for the network interface
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// Respond with results
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func handleDHCPFindActiveServer(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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errorText := fmt.Sprintf("failed to read request body: %s", err)
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log.Error(errorText)
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http.Error(w, errorText, http.StatusBadRequest)
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return
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}
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interfaceName := strings.TrimSpace(string(body))
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if interfaceName == "" {
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errorText := fmt.Sprintf("empty interface name specified")
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log.Error(errorText)
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http.Error(w, errorText, http.StatusBadRequest)
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return
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}
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found, err := dhcpd.CheckIfOtherDHCPServersPresent(interfaceName)
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othSrv := map[string]interface{}{}
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foundVal := "no"
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if found {
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foundVal = "yes"
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} else if err != nil {
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foundVal = "error"
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othSrv["error"] = err.Error()
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}
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othSrv["found"] = foundVal
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staticIP := map[string]interface{}{}
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isStaticIP, err := hasStaticIP(interfaceName)
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staticIPStatus := "yes"
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if err != nil {
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staticIPStatus = "error"
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staticIP["error"] = err.Error()
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} else if !isStaticIP {
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staticIPStatus = "no"
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staticIP["ip"] = getFullIP(interfaceName)
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}
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staticIP["static"] = staticIPStatus
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result := map[string]interface{}{}
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result["other_server"] = othSrv
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result["static_ip"] = staticIP
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w.Header().Set("Content-Type", "application/json")
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err = json.NewEncoder(w).Encode(result)
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if err != nil {
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httpError(w, http.StatusInternalServerError, "Failed to marshal DHCP found json: %s", err)
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return
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}
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}
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// Check if network interface has a static IP configured
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func hasStaticIP(ifaceName string) (bool, error) {
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if runtime.GOOS == "windows" {
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return false, errors.New("Can't detect static IP: not supported on Windows")
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}
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body, err := ioutil.ReadFile("/etc/dhcpcd.conf")
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if err != nil {
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return false, err
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}
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lines := strings.Split(string(body), "\n")
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nameLine := fmt.Sprintf("interface %s", ifaceName)
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withinInterfaceCtx := false
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for _, line := range lines {
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line = strings.TrimSpace(line)
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if withinInterfaceCtx && len(line) == 0 {
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// an empty line resets our state
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withinInterfaceCtx = false
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}
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if len(line) == 0 || line[0] == '#' {
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continue
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}
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line = strings.TrimSpace(line)
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if !withinInterfaceCtx {
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if line == nameLine {
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// we found our interface
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withinInterfaceCtx = true
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}
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} else {
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if strings.HasPrefix(line, "interface ") {
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// we found another interface - reset our state
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withinInterfaceCtx = false
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continue
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}
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if strings.HasPrefix(line, "static ip_address=") {
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return true, nil
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}
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}
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}
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return false, nil
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}
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// Get IP address with netmask
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func getFullIP(ifaceName string) string {
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cmd := exec.Command("ip", "-oneline", "-family", "inet", "address", "show", ifaceName)
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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d, err := cmd.Output()
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if err != nil || cmd.ProcessState.ExitCode() != 0 {
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return ""
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}
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fields := strings.Fields(string(d))
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if len(fields) < 4 {
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return ""
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}
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_, _, err = net.ParseCIDR(fields[3])
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if err != nil {
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return ""
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}
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return fields[3]
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}
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// Get gateway IP address
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func getGatewayIP(ifaceName string) string {
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cmd := exec.Command("ip", "route", "show", "dev", ifaceName)
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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d, err := cmd.Output()
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if err != nil || cmd.ProcessState.ExitCode() != 0 {
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return ""
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}
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fields := strings.Fields(string(d))
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if len(fields) < 3 || fields[0] != "default" {
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return ""
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}
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ip := net.ParseIP(fields[2])
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if ip == nil {
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return ""
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}
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return fields[2]
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}
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// Set a static IP for network interface
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func setStaticIP(ifaceName string) error {
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ip := getFullIP(ifaceName)
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if len(ip) == 0 {
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return errors.New("Can't get IP address")
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}
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body, err := ioutil.ReadFile("/etc/dhcpcd.conf")
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if err != nil {
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return err
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}
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ip4, _, err := net.ParseCIDR(ip)
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if err != nil {
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return err
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}
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add := fmt.Sprintf("\ninterface %s\nstatic ip_address=%s\n",
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ifaceName, ip)
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body = append(body, []byte(add)...)
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gatewayIP := getGatewayIP(ifaceName)
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if len(gatewayIP) != 0 {
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add = fmt.Sprintf("static routers=%s\n",
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gatewayIP)
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body = append(body, []byte(add)...)
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}
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add = fmt.Sprintf("static domain_name_servers=%s\n\n",
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ip4)
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body = append(body, []byte(add)...)
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err = file.SafeWrite("/etc/dhcpcd.conf", body)
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if err != nil {
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return err
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}
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return nil
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}
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func handleDHCPAddStaticLease(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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lj := leaseJSON{}
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err := json.NewDecoder(r.Body).Decode(&lj)
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if err != nil {
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httpError(w, http.StatusBadRequest, "json.Decode: %s", err)
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return
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}
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ip := parseIPv4(lj.IP)
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if ip == nil {
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httpError(w, http.StatusBadRequest, "invalid IP")
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return
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}
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mac, _ := net.ParseMAC(lj.HWAddr)
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lease := dhcpd.Lease{
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IP: ip,
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HWAddr: mac,
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Hostname: lj.Hostname,
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}
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err = config.dhcpServer.AddStaticLease(lease)
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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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returnOK(w)
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}
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func handleDHCPRemoveStaticLease(w http.ResponseWriter, r *http.Request) {
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log.Tracef("%s %v", r.Method, r.URL)
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lj := leaseJSON{}
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err := json.NewDecoder(r.Body).Decode(&lj)
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if err != nil {
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httpError(w, http.StatusBadRequest, "json.Decode: %s", err)
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return
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}
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ip := parseIPv4(lj.IP)
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if ip == nil {
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httpError(w, http.StatusBadRequest, "invalid IP")
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return
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}
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mac, _ := net.ParseMAC(lj.HWAddr)
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lease := dhcpd.Lease{
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IP: ip,
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HWAddr: mac,
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Hostname: lj.Hostname,
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}
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err = config.dhcpServer.RemoveStaticLease(lease)
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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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returnOK(w)
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}
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func startDHCPServer() error {
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if !config.DHCP.Enabled {
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// not enabled, don't do anything
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return nil
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}
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err := config.dhcpServer.Init(config.DHCP)
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if err != nil {
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return errorx.Decorate(err, "Couldn't init DHCP server")
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}
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err = config.dhcpServer.Start()
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if err != nil {
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return errorx.Decorate(err, "Couldn't start DHCP server")
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}
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return nil
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}
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func stopDHCPServer() error {
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if !config.DHCP.Enabled {
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return nil
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}
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err := config.dhcpServer.Stop()
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if err != nil {
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return errorx.Decorate(err, "Couldn't stop DHCP server")
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}
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return nil
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}
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