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 var (
  18         versionGit = "development"
  19         versionNumber = "2.0.0"
  20         versionString = "mailpopbox " + versionNumber + " (" + versionGit + ")\n"
  21 )
  22
  23 func main() {
  24         if len(os.Args) != 2 {
  25                 fmt.Fprintf(os.Stderr, "Usage: %s config.json\n", os.Args[0])
  26                 os.Exit(1)
  27         }
  28
  29         if os.Args[1] == "version" {
  30                 fmt.Print(versionString)
  31                 os.Exit(0)
  32         }
  33
  34         configFile, err := os.Open(os.Args[1])
  35         if err != nil {
  36                 fmt.Fprintf(os.Stderr, "config file: %s\n", err)
  37                 os.Exit(2)
  38         }
  39
  40         var config Config
  41         if err := json.NewDecoder(configFile).Decode(&config); err != nil {
  42                 fmt.Fprintf(os.Stderr, "config file: %s\n", err)
  43                 os.Exit(3)
  44         }
  45         configFile.Close()
  46
  47         logConfig := zap.NewDevelopmentConfig()
  48         logConfig.Development = false
  49         logConfig.DisableStacktrace = true
  50         logConfig.Level.SetLevel(zap.DebugLevel)
  51         log, err := logConfig.Build()
  52         if err != nil {
  53                 fmt.Fprintf(os.Stderr, "create logger: %v\n", err)
  54                 os.Exit(4)
  55         }
  56
  57         log.Info("starting mailpopbox", zap.String("hostname", config.Hostname))
  58
  59         pop3 := runPOP3Server(config, log)
  60         smtp := runSMTPServer(config, log)
  61
  62         for {
  63                 select {
  64                 case cm := <-pop3:
  65                         if cm == ServerControlRestart {
  66                                 pop3 = runPOP3Server(config, log)
  67                         } else {
  68                                 break
  69                         }
  70                 case <-smtp:
  71                         // smtp never reloads.
  72                         break
  73                 }
  74         }
  75 }