1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
package main
import (
"flag"
"fmt"
"net"
"os"
"os/signal"
"syscall"
)
type Flags struct {
Groups string
HostName string
Listen string
StdErr string
}
func ParseArgs() (*Flags, []string) {
var flags Flags
name, _ := os.Hostname()
flag.StringVar(&flags.Groups, "groups", "/etc/postfix/user_groups", "User group list")
flag.StringVar(&flags.HostName, "hostname", name, "E-Mail hostname")
flag.StringVar(&flags.Listen, "listen", "-", "listen socket path")
flag.StringVar(&flags.StdErr, "std-err", name, "Redirect errors to filepath")
flag.Parse()
return &flags, flag.Args()
}
func handleSignal(c <-chan os.Signal, listenner net.Listener) {
for v := range c {
switch v {
case syscall.SIGINT:
_ = listenner.Close()
default:
}
}
}
func exitOnErr(err error) {
if err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(1)
}
}
func main() {
flags, groups := ParseArgs()
if flags.StdErr != "" {
f, _ := os.OpenFile(flags.StdErr, os.O_APPEND|os.O_RDWR|os.O_CREATE, 0666)
os.Stderr = f
defer f.Close()
}
srv := &Server{
HostName: flags.HostName,
GroupsFile: flags.Groups,
Groups: groups,
}
if flags.Listen == "-" {
srv.HandleConn(os.Stdout, os.Stdin)
return
}
listenner, err := net.Listen("unix", flags.Listen)
exitOnErr(err)
defer os.Remove(flags.Listen)
err = os.Chmod(flags.Listen, os.ModePerm)
exitOnErr(err)
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGHUP, syscall.SIGINT)
go handleSignal(c, listenner)
err = ServeUnixSocket(listenner, srv)
exitOnErr(err)
}
|
