-
-
Notifications
You must be signed in to change notification settings - Fork 7
/
config.go
96 lines (85 loc) · 1.95 KB
/
config.go
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
86
87
88
89
90
91
92
93
94
95
96
package ipecho
import (
"fmt"
"log"
"strconv"
"strings"
"github.com/asaskevich/govalidator"
"github.com/coredns/caddy/caddyfile"
)
type config struct {
// Domains defines the Domains we will react to
Domains []string
// TTL to use for response
TTL uint32
// Debug mode
Debug bool
}
const (
defaultTTL = 2629800
)
func newConfigFromDispenser(c caddyfile.Dispenser) (*config, error) {
cfg := config{
TTL: defaultTTL,
}
for c.NextBlock() {
var err error
if strings.EqualFold(c.Val(), "domain") {
err = parseDomainPart(c, &cfg)
} else if strings.EqualFold(c.Val(), "ttl") {
err = parseTTLPart(c, &cfg)
} else if strings.EqualFold(c.Val(), "debug") {
err = parseDebugPart(c, &cfg)
}
if err != nil {
return nil, err
}
}
if cfg.Debug {
log.Println("[ipecho] Debug Mode is on")
log.Printf("[ipecho] Parsed %d Domains: %s\n", len(cfg.Domains), strings.Join(cfg.Domains, ", "))
log.Printf("[ipecho] TTL is %d", cfg.TTL)
}
if len(cfg.Domains) == 0 {
return nil, fmt.Errorf("there is no domain to handle")
}
return &cfg, nil
}
func parseDomainPart(c caddyfile.Dispenser, cfg *config) error {
if !c.NextArg() {
return nil
}
domain := strings.ToLower(strings.Trim(c.Val(), "."))
if !govalidator.IsDNSName(domain) {
return fmt.Errorf("'%s' is not a valid domain name", domain)
}
domain += "."
exists := false
for i := range cfg.Domains {
if cfg.Domains[i] == domain {
exists = true
break
}
}
if !exists {
cfg.Domains = append(cfg.Domains, domain)
}
return nil
}
func parseTTLPart(c caddyfile.Dispenser, cfg *config) error {
if !c.NextArg() {
return nil
}
//nolint: gomnd // parse ttl as uint32 with base 10
ttl, err := strconv.ParseUint(c.Val(), 10, 32)
if err != nil {
return fmt.Errorf("invalid TTL value: '%s'", c.Val())
}
cfg.TTL = uint32(ttl)
return nil
}
//nolint: unparam // result is always nil
func parseDebugPart(_ caddyfile.Dispenser, cfg *config) error {
cfg.Debug = true
return nil
}