feat: Add worker for dhclient (#8)

Author: pojntfx

pkg/utils/processworker.go

@@ -5,7 +5,7 @@ import (
 	"syscall"
 )
 
-// ProcessWorker is a worker that manages a process
+// ProcessWorker is a worker that manages a process.
 type ProcessWorker struct {
 	Instance             *exec.Cmd
 	ScheduledForDeletion bool

pkg/workers/dhclient.go

@@ -0,0 +1,31 @@
+package workers
+
+import (
+	"github.com/pojntfx/godhcpd/pkg/utils"
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+// DHClient is a dhcp client.
+type DHClient struct {
+	utils.ProcessWorker
+	Device    string
+	BinaryDir string
+}
+
+// Start starts the the dhcp client.
+func (d *DHClient) Start() error {
+	d.ScheduledForDeletion = false
+
+	command := exec.Command(d.BinaryDir, "-d", "-i", d.Device)
+
+	command.Stdout = os.Stdout
+	command.Stderr = os.Stderr
+
+	command.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+
+	d.Instance = command
+
+	return command.Start()
+}

pkg/workers/dhcpd.go

@@ -9,7 +9,7 @@ import (
 	"syscall"
 )
 
-// DHCPD is a DHCP server.
+// DHCPD is a dhcp server.
 type DHCPD struct {
 	utils.ProcessWorker
 	Subnets       []Subnet
@@ -21,7 +21,7 @@ type DHCPD struct {
 	leasesFileDir string
 }
 
-// Subnet is a DHCP subnet.
+// Subnet is a dhcp subnet.
 type Subnet struct {
 	Network string
 	Netmask string
@@ -34,7 +34,7 @@ type Range struct {
 	End   string
 }
 
-// Configure configures the DHCP server.
+// Configure configures the dhcp server.
 func (d *DHCPD) Configure() error {
 	var configFileContent string
 	for _, subnet := range d.Subnets {
@@ -71,7 +71,7 @@ func (d *DHCPD) Configure() error {
 	return nil
 }
 
-// Start starts the the DHCP server.
+// Start starts the the dhcp server.
 func (d *DHCPD) Start() error {
 	d.ScheduledForDeletion = false
 
@@ -87,7 +87,7 @@ func (d *DHCPD) Start() error {
 	return command.Start()
 }
 
-// Cleanup deletes the state of the DHCP server.
+// Cleanup deletes the state of the dhcp server.
 func (d *DHCPD) Cleanup() error {
 	return os.RemoveAll(d.StateDir)
 }