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|
package nslcd_systemd
import (
"fmt"
"net"
"nslcd_proto"
"os"
"os/signal"
sd "sd_daemon"
"sd_daemon/logger"
"sd_daemon/lsb"
"sync"
"syscall"
)
type Backend interface {
nslcd_proto.Backend
Reload() error
}
func get_socket() (socket net.Listener, err error) {
socket = nil
err = nil
fds := sd.ListenFds(true)
if fds == nil {
err = fmt.Errorf("failed to aquire sockets from systemd")
return
}
if len(fds) != 1 {
err = fmt.Errorf("wrong number of sockets from systemd: expected %d but got %d", 1, len(fds))
return
}
socket, err = net.FileListener(fds[0])
fds[0].Close()
return
}
func getpeercred(conn *net.UnixConn) (cred nslcd_proto.Ucred, err error) {
file, err := conn.File()
if err != nil {
return
}
defer file.Close()
_cred, err := syscall.GetsockoptUcred(int(file.Fd()), syscall.SOL_SOCKET, syscall.SO_PEERCRED)
cred = nslcd_proto.Ucred{*_cred}
return
}
func handler(conn *net.UnixConn, backend nslcd_proto.Backend) {
defer conn.Close()
cred, err := getpeercred(conn)
if err != nil {
logger.Debug("connection from unknown client")
} else {
logger.Debug("connection from pid=%v uid=%v gid=%v",
cred.Pid, cred.Uid, cred.Gid)
}
err = nslcd_proto.HandleRequest(backend, conn, conn, cred)
if err != nil {
logger.Debug("Error while handling request: %v", err)
}
}
func Main(backend Backend) uint8 {
var err error = nil
var socket net.Listener = nil
defer func() {
if socket != nil {
socket.Close()
}
}()
socket, err = get_socket()
if err != nil {
logger.Err("%s", err.Error())
sd.Notify(false, "STOPPING=1")
return lsb.EXIT_NOTRUNNING
}
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGTERM, syscall.SIGHUP)
sock := make(chan *net.UnixConn, 1)
go func() {
for {
conn, err := socket.Accept()
if err != nil {
logger.Notice("Accept: %s", err.Error())
}
sock <- conn.(*net.UnixConn)
}
}()
exit := lsb.EXIT_SUCCESS
var wg sync.WaitGroup
sd.Notify(false, "READY=1")
Loop:
for {
select {
case sig := <-sigs:
switch sig {
case syscall.SIGTERM:
break Loop
case syscall.SIGHUP:
sd.Notify(false, "RELOADING=1")
err := backend.Reload()
if err != nil {
logger.Notice("Reload: %s", err.Error())
exit = lsb.EXIT_NOTRUNNING
break Loop
}
sd.Notify(false, "READY=1")
}
case conn := <-sock:
go func() {
wg.Add(1)
defer wg.Done()
handler(conn, backend)
}()
}
}
sd.Notify(false, "STOPPING=1")
wg.Wait()
return exit
}
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