+ POST /control/dhcp/reset: Reset DHCP configuration

AGHTechDoc.md

@@ -28,6 +28,7 @@ Contents:
 	* "Enable DHCP" command
 	* Static IP check/set
 	* Add a static lease
+	* API: Reset DHCP configuration
 * DNS access settings
 	* List access settings
 	* Set access settings
@@ -543,6 +544,20 @@ Response:
 	200 OK
 
 
+### API: Reset DHCP configuration
+
+Clear all DHCP leases and configuration settings.
+DHCP server will be stopped if it's currently running.
+
+Request:
+
+	POST /control/dhcp/reset
+
+Response:
+
+	200 OK
+
+
 ## TLS
 
 

dhcpd/dhcp_http.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"net"
 	"net/http"
+	"os"
 	"os/exec"
 	"runtime"
 	"strings"
@@ -451,6 +452,28 @@ func (s *Server) handleDHCPRemoveStaticLease(w http.ResponseWriter, r *http.Requ
 	}
 }
 
+func (s *Server) handleReset(w http.ResponseWriter, r *http.Request) {
+	err := s.Stop()
+	if err != nil {
+		log.Error("DHCP: Stop: %s", err)
+	}
+
+	err = os.Remove(s.conf.DBFilePath)
+	if err != nil && !os.IsNotExist(err) {
+		log.Error("DHCP: os.Remove: %s: %s", s.conf.DBFilePath, err)
+	}
+
+	oldconf := s.conf
+	s.conf = ServerConfig{}
+	s.conf.LeaseDuration = 86400
+	s.conf.ICMPTimeout = 1000
+	s.conf.WorkDir = oldconf.WorkDir
+	s.conf.HTTPRegister = oldconf.HTTPRegister
+	s.conf.ConfigModified = oldconf.ConfigModified
+	s.conf.DBFilePath = oldconf.DBFilePath
+	s.conf.ConfigModified()
+}
+
 func (s *Server) registerHandlers() {
 	s.conf.HTTPRegister("GET", "/control/dhcp/status", s.handleDHCPStatus)
 	s.conf.HTTPRegister("GET", "/control/dhcp/interfaces", s.handleDHCPInterfaces)
@@ -458,4 +481,5 @@ func (s *Server) registerHandlers() {
 	s.conf.HTTPRegister("POST", "/control/dhcp/find_active_dhcp", s.handleDHCPFindActiveServer)
 	s.conf.HTTPRegister("POST", "/control/dhcp/add_static_lease", s.handleDHCPAddStaticLease)
 	s.conf.HTTPRegister("POST", "/control/dhcp/remove_static_lease", s.handleDHCPRemoveStaticLease)
+	s.conf.HTTPRegister("POST", "/control/dhcp/reset", s.handleReset)
 }

dhcpd/dhcpd.go

@@ -39,13 +39,14 @@ type ServerConfig struct {
 	SubnetMask    string `json:"subnet_mask" yaml:"subnet_mask"`
 	RangeStart    string `json:"range_start" yaml:"range_start"`
 	RangeEnd      string `json:"range_end" yaml:"range_end"`
-	LeaseDuration uint   `json:"lease_duration" yaml:"lease_duration"` // in seconds
+	LeaseDuration uint32 `json:"lease_duration" yaml:"lease_duration"` // in seconds
-	WorkDir       string `json:"-" yaml:"-"`
-	DBFilePath    string `json:"-" yaml:"-"` // path to DB file
 
 	// IP conflict detector: time (ms) to wait for ICMP reply.
 	// 0: disable
-	ICMPTimeout uint `json:"icmp_timeout_msec" yaml:"icmp_timeout_msec"`
+	ICMPTimeout uint32 `json:"icmp_timeout_msec" yaml:"icmp_timeout_msec"`
+
+	WorkDir    string `json:"-" yaml:"-"`
+	DBFilePath string `json:"-" yaml:"-"` // path to DB file
 
 	// Called when the configuration is changed by HTTP request
 	ConfigModified func() `json:"-" yaml:"-"`