mokhtar/local-ip.sh
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handle TXT for emails

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m5r 2022-10-29 15:01:07 +02:00
parent 726e851059
commit 7305ae557a
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1 changed files with 42 additions and 14 deletions
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56
xip/xip.go
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@ -18,30 +18,38 @@ type Xip struct {
Zone string Zone string
} }
type HardcodedRecord struct {
A net.IP
TXT []string
}
var ( var (
flyRegion = os.Getenv("FLY_REGION") flyRegion = os.Getenv("FLY_REGION")
dottedIpV4Regex = regexp.MustCompile(`(?:^|(?:[\w\d])+\.)(((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4})($|[.-])`) dottedIpV4Regex = regexp.MustCompile(`(?:^|(?:[\w\d])+\.)(((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4})($|[.-])`)
dashedIpV4Regex = regexp.MustCompile(`(?:^|(?:[\w\d])+\.)(((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\-?\b){4})($|[.-])`) dashedIpV4Regex = regexp.MustCompile(`(?:^|(?:[\w\d])+\.)(((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\-?\b){4})($|[.-])`)
hardcodedDomains = map[string]net.IP{ hardcodedRecords = map[string]HardcodedRecord{
"ns.local-ip.sh.": net.IPv4(137, 66, 38, 214), "ns.local-ip.sh.": {
"ns1.local-ip.sh.": net.IPv4(137, 66, 38, 214), A: net.IPv4(137, 66, 38, 214),
"ns2.local-ip.sh.": net.IPv4(137, 66, 38, 214), },
"local-ip.sh.": {
A: net.IPv4(137, 66, 53, 22),
TXT: []string{"sl-verification=frudknyqpqlpgzbglkqnsmorfcvxrf"},
},
} }
) )
func (xip *Xip) fqdnToA(fqdn string) *dns.A { func (xip *Xip) fqdnToA(fqdn string) *dns.A {
var ipV4Address net.IP var ipV4Address net.IP
if hardcodedRecords[strings.ToLower(fqdn)].A != nil {
ipV4Address = hardcodedRecords[strings.ToLower(fqdn)].A
}
if hardcodedDomains[strings.ToLower(fqdn)] != nil { for _, ipV4RE := range []*regexp.Regexp{dashedIpV4Regex, dottedIpV4Regex} {
ipV4Address = hardcodedDomains[strings.ToLower(fqdn)] if ipV4RE.MatchString(fqdn) {
} else { match := ipV4RE.FindStringSubmatch(fqdn)[1]
for _, ipV4RE := range []*regexp.Regexp{dashedIpV4Regex, dottedIpV4Regex} { match = strings.ReplaceAll(match, "-", ".")
if ipV4RE.MatchString(fqdn) { ipV4Address = net.ParseIP(match).To4()
match := ipV4RE.FindStringSubmatch(fqdn)[1] break
match = strings.ReplaceAll(match, "-", ".")
ipV4Address = net.ParseIP(match).To4()
break
}
} }
} }
@ -103,6 +111,24 @@ func (xip *Xip) handleNS(question dns.Question, message *dns.Msg) {
} }
} }
func (xip *Xip) handleTXT(question dns.Question, message *dns.Msg) {
fqdn := question.Name
if hardcodedRecords[strings.ToLower(fqdn)].TXT == nil {
return
}
message.Answer = append(message.Answer, &dns.TXT{
Hdr: dns.RR_Header{
// Ttl: uint32((time.Hour * 24 * 7).Seconds()),
Ttl: uint32((time.Second * 10).Seconds()),
Name: fqdn,
Rrtype: dns.TypeTXT,
Class: dns.ClassINET,
},
Txt: hardcodedRecords[strings.ToLower(fqdn)].TXT,
})
}
func (xip *Xip) SOARecord(question dns.Question) *dns.SOA { func (xip *Xip) SOARecord(question dns.Question) *dns.SOA {
soa := new(dns.SOA) soa := new(dns.SOA)
soa.Hdr = dns.RR_Header{ soa.Hdr = dns.RR_Header{
@ -138,6 +164,8 @@ func (xip *Xip) handleQuery(message *dns.Msg) {
xip.handleA(question, message) xip.handleA(question, message)
case dns.TypeNS: case dns.TypeNS:
xip.handleNS(question, message) xip.handleNS(question, message)
case dns.TypeTXT:
xip.handleTXT(question, message)
} }
} }
} }