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Fix the MX example -- and keep it simple

This commit is contained in:
Miek Gieben 2011-06-14 21:25:24 +02:00
parent 3343234bf2
commit d93e0341bb
2 changed files with 17 additions and 24 deletions
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29
_examples/mx/mx.go
View File

@ -1,5 +1,4 @@
package main package main
// Print the MX records of a domain // Print the MX records of a domain
// (c) Miek Gieben - 2011 // (c) Miek Gieben - 2011
import ( import (
@ -13,34 +12,28 @@ func main() {
fmt.Printf("%s DOMAIN\n", os.Args[0]) fmt.Printf("%s DOMAIN\n", os.Args[0])
os.Exit(1) os.Exit(1)
} }
d := new(dns.Conn)
c, err := dns.ClientConfigFromFile("/etc/resolv.conf") // Error checking
// Errorchecking config, _ := dns.ClientConfigFromFile("/etc/resolv.conf")
d.RemoteAddr = c.Servers[0] c := dns.NewClient()
m := new(dns.Msg) m := new(dns.Msg)
m.Id = dns.Id() m.SetQuestion(os.Args[1], dns.TypeMX)
m.MsgHdr.RecursionDesired = true m.MsgHdr.RecursionDesired = true
m.Question = make([]dns.Question, 1)
m.Question[0] = dns.Question{os.Args[1], dns.TypeMX, dns.ClassINET}
err = d.Dial("udp") // Simple sync query, nothing fancy
if err != nil { r := c.Exchange(m, config.Servers[0])
fmt.Printf("*** error: %s\n", err.String())
if r == nil {
os.Exit(1) os.Exit(1)
} }
in, err := dns.SimpleQuery("udp", d, m) if r.Rcode != dns.RcodeSuccess {
if in != nil {
if in.Rcode != dns.RcodeSuccess {
fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1]) fmt.Printf(" *** invalid answer name %s after MX query for %s\n", os.Args[1], os.Args[1])
os.Exit(1) os.Exit(1)
} }
// Stuff must be in the answer section // Stuff must be in the answer section
for _, a := range in.Answer { for _, a := range r.Answer {
fmt.Printf("%v\n", a) fmt.Printf("%v\n", a)
} }
} else {
fmt.Printf("*** error: %s\n", err.String())
}
} }

2
client.go
View File

@ -179,7 +179,7 @@ func (w *reply) Write(m *Msg) {
w.Client().ChannelReply <- []*Msg{w.req, m} w.Client().ChannelReply <- []*Msg{w.req, m}
} }
// Do performs an asynchronize query. The result is returned on the // Do performs an async query. The result is returned on the
// channel set in the c. // channel set in the c.
func (c *Client) Do(m *Msg, a string) { func (c *Client) Do(m *Msg, a string) {
if c.ChannelQuery == nil { if c.ChannelQuery == nil {