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api.go
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api.go
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/*
* Copyright (C) 2023 Kendall Tauser
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package app
import (
"fmt"
"os"
"os/signal"
"syscall"
)
// Unprivileged API listener main function.
func apiMain() {
fmt.Printf("starting api process, dropping process privilege")
if os.Getuid() != unprivilegedUID || os.Getgid() != unprivilegedGID {
if e := dropPriv(); e != nil {
// TODO send calls to the other processes to kill themselves, and kill the whole control plane.
}
}
fmt.Printf("starting api process, initializing signal handler")
sig := make(chan os.Signal, 5)
signal.Notify(sig)
go apisignalHandler(sig)
}
func dropPriv() error {
if e := syscall.Setuid(unprivilegedUID); e != nil {
return e
}
if e := syscall.Setgid(unprivilegedGID); e != nil {
return e
}
return nil
}
func apisignalHandler(sig chan os.Signal) error {
for {
signal := <-sig
switch signal {
case syscall.SIGHUP: // Reload configuration, gracefully stop and restart the server.
{
continue
}
case syscall.SIGKILL | syscall.SIGINT: // Hard stop the control plane.
{
break
}
case syscall.SIGTERM: //Gracefully stop the control plane
{
break
}
default:
{
continue
}
}
}
// return nil
}