AdGuardHome/dhcp.go

189 lines
4.5 KiB
Go

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) {
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) {
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
}
if newconfig.Enabled {
err := dhcpServer.Start(&newconfig)
if err != nil {
httpError(w, http.StatusBadRequest, "Failed to start DHCP server: %s", err)
return
}
}
if !newconfig.Enabled {
err := dhcpServer.Stop()
if err != nil {
log.Error("failed to stop the DHCP server: %s", err)
}
}
config.DHCP = newconfig
httpUpdateConfigReloadDNSReturnOK(w, r)
}
func handleDHCPInterfaces(w http.ResponseWriter, r *http.Request) {
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) {
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
}