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Description
Here's a small program
package main
import (
"fmt"
"log"
"strings"
"github.com/cloudflare/dns"
"github.com/gopherjs/gopherjs/js"
)
func main() {
js.Global.Set("go", map[string]interface{}{
"ToDS": ToDS,
})
}
func ToDS(zone string) {
go func() {
zone := "filippo.io.\t3600\tIN\tDNSKEY\t257 3 13 DGpDkudNu/XQT1KmQkXFtKCfZPxHGV07qSTIcDXS33/WtT8UUG7LyxAgKznsRSFEhiQVR53E69/E57IFm8b6Zw=="
r := strings.NewReader(zone)
for {
rr, err := dns.ReadRR(r, "")
if err != nil {
log.Println(err)
continue
}
if rr == nil {
break
}
dnskey, ok := rr.(*dns.DNSKEY)
if !ok {
log.Println("Not a DNSKEY:", rr)
continue
}
if dnskey.Flags&dns.SEP == 0 {
// ZSK
continue
}
ds1 := dnskey.ToDS(dns.SHA1)
ds2 := dnskey.ToDS(dns.SHA256)
js.Global.Get("document").Call("write", fmt.Sprintf("%s\n%s\n", ds1, ds2))
}
}()
}I compile it with default options and load it in a empty page, and then from the console:
> go.ToDS("")
< undefined
syscall.go:44 2015/07/21 01:32:52 dns: not a TTL: "DGpDkudNu/XQT1KmQkXFtKCfZPxHGV07qSTIcDXS33/WtT8UUG7LyxAgKznsRSFEhiQVR53E69/E57IFm8b6Zw==" at line: 1:124
The parser fails in some weird way. Different inputs fail in different ways.
Here's a equivalent program, that I run with go run
package main
import (
"fmt"
"log"
"strings"
"github.com/cloudflare/dns"
)
func main() {
zone := "filippo.io.\t3600\tIN\tDNSKEY\t257 3 13 DGpDkudNu/XQT1KmQkXFtKCfZPxHGV07qSTIcDXS33/WtT8UUG7LyxAgKznsRSFEhiQVR53E69/E57IFm8b6Zw=="
r := strings.NewReader(zone)
for {
rr, err := dns.ReadRR(r, "")
if err != nil {
log.Println(err)
continue
}
if rr == nil {
break
}
dnskey, ok := rr.(*dns.DNSKEY)
if !ok {
log.Println("Not a DNSKEY:", rr)
continue
}
if dnskey.Flags&dns.SEP == 0 {
// ZSK
continue
}
ds1 := dnskey.ToDS(dns.SHA1)
ds2 := dnskey.ToDS(dns.SHA256)
println(fmt.Sprintf("%s\n%s\n", ds1, ds2))
}
}$ go run src/dnskey-to-ds/test.go
filippo.io. 3600 IN DS 42 13 1 6D68D297C0AF610513996154BDDDEDA300831957
filippo.io. 3600 IN DS 42 13 2 2DDD9653A96320688619B6F0EBACEC1A2F4DEBA8D563A6D37C64FB3197C108A7
First time gopherjs user, so I might be missing something, but it looks like a bug in the channel usage of dns.ReadRR (source)
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