mailpopbox.go

   1 // mailpopbox
   2 // Copyright 2020 Blue Static <https://www.bluestatic.org>
   3 // This program is free software licensed under the GNU General Public License,
   4 // version 3.0. The full text of the license can be found in LICENSE.txt.
   5 // SPDX-License-Identifier: GPL-3.0-only
   6
   7 package main
   8
   9 import (
  10         "encoding/json"
  11         "fmt"
  12         "os"
  13
  14         "go.uber.org/zap"
  15 )
  16
  17 func main() {
  18         if len(os.Args) != 2 {
  19                 fmt.Fprintf(os.Stderr, "Usage: %s config.json\n", os.Args[0])
  20                 os.Exit(1)
  21         }
  22
  23         if os.Args[1] == "version" {
  24                 fmt.Print(versionString)
  25                 os.Exit(0)
  26         }
  27
  28         configFile, err := os.Open(os.Args[1])
  29         if err != nil {
  30                 fmt.Fprintf(os.Stderr, "config file: %s\n", err)
  31                 os.Exit(2)
  32         }
  33
  34         var config Config
  35         if err := json.NewDecoder(configFile).Decode(&config); err != nil {
  36                 fmt.Fprintf(os.Stderr, "config file: %s\n", err)
  37                 os.Exit(3)
  38         }
  39         configFile.Close()
  40
  41         logConfig := zap.NewDevelopmentConfig()
  42         logConfig.Development = false
  43         logConfig.DisableStacktrace = true
  44         logConfig.Level.SetLevel(zap.DebugLevel)
  45         log, err := logConfig.Build()
  46         if err != nil {
  47                 fmt.Fprintf(os.Stderr, "create logger: %v\n", err)
  48                 os.Exit(4)
  49         }
  50
  51         log.Info("starting mailpopbox", zap.String("hostname", config.Hostname))
  52
  53         pop3 := runPOP3Server(config, log)
  54         smtp := runSMTPServer(config, log)
  55
  56         for {
  57                 select {
  58                 case cm := <-pop3:
  59                         if cm == ServerControlRestart {
  60                                 pop3 = runPOP3Server(config, log)
  61                         } else {
  62                                 break
  63                         }
  64                 case <-smtp:
  65                         // smtp never reloads.
  66                         break
  67                 }
  68         }
  69 }