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Fix the examples so that they work with a nonresponding nameserver 

Added some error checking
This commit is contained in:
Miek Gieben 2011-01-03 12:30:19 +01:00
parent 659fc455ba
commit b57613e8d8
3 changed files with 22 additions and 9 deletions
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10
_examples/chaos/chaos.go
View File

@ -58,6 +58,11 @@ func addresses(qr chan resolver.DnsMsg, name string) []net.IP {
qr <- resolver.DnsMsg{m, nil}
in := <-qr
if in.Dns == nil {
fmt.Printf("Nothing recevied: %s\n", in.Error.String())
return nil
}
if in.Dns.Rcode != dns.RcodeSuccess {
return nil
}
@ -69,6 +74,11 @@ func addresses(qr chan resolver.DnsMsg, name string) []net.IP {
qr <- resolver.DnsMsg{m, nil}
in = <-qr
if in.Dns == nil {
fmt.Printf("Nothing recevied: %s\n", in.Error.String())
return nil
}
if in.Dns.Rcode != dns.RcodeSuccess {
return nil
}

BIN
_examples/mx/_go_.6
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21
_examples/mx/mx.go
View File

@ -17,7 +17,7 @@ func main() {
r.Attempts = 1
if len(os.Args) != 2 {
fmt.Printf("%s DOMAIN\n", os.Args[0])
fmt.Printf("%s DOMAIN\nIt using 127.0.0.1 as a nameserver\n", os.Args[0])
os.Exit(1)
}
@ -28,14 +28,17 @@ func main() {
qr <- resolver.DnsMsg{m, nil}
in := <-qr
if in.Dns.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
// Stuff must be in the answer section
for _, a := range in.Dns.Answer {
fmt.Printf("%v\n", a)
if in.Dns != nil {
if in.Dns.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
os.Exit(1)
}
// Stuff must be in the answer section
for _, a := range in.Dns.Answer {
fmt.Printf("%v\n", a)
}
} else {
fmt.Printf("*** error: %s\n", in.Error.String())
}
// Stop the resolver, send it a null mesg