maddy

 1/*
 2Maddy Mail Server - Composable all-in-one email server.
 3Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
 4
 5This program is free software: you can redistribute it and/or modify
 6it under the terms of the GNU General Public License as published by
 7the Free Software Foundation, either version 3 of the License, or
 8(at your option) any later version.
 9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program.  If not, see <https://www.gnu.org/licenses/>.
17*/
18
19package exterrors
20
21import (
22	"net"
23)
24
25func UnwrapDNSErr(err error) (reason string, misc map[string]interface{}) {
26	dnsErr, ok := err.(*net.DNSError)
27	if !ok {
28		// Return non-nil in case the user will try to 'extend' it with its own
29		// values.
30		return "", map[string]interface{}{}
31	}
32
33	// Nor server name, nor DNS name are usually useful, so exclude them.
34	return dnsErr.Err, map[string]interface{}{}
35}