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net: fix lookup of AAAA-only hosts without cgo

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Fixes #3762.

R=rsc
CC=golang-dev
https://golang.org/cl/6303106
This commit is contained in:
Michael Stapelberg 2012-06-25 17:32:39 -04:00 committed by Russ Cox
parent ec6b5123fe
commit dfbd42e4f8
1 changed files with 17 additions and 11 deletions
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28
src/pkg/net/dnsclient_unix.go
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@ -237,24 +237,30 @@ func goLookupIP(name string) (addrs []IP, err error) {
}
var records []dnsRR
var cname string
cname, records, err = lookup(name, dnsTypeA)
if err != nil {
return
}
var err4, err6 error
cname, records, err4 = lookup(name, dnsTypeA)
addrs = convertRR_A(records)
if cname != "" {
name = cname
}
_, records, err = lookup(name, dnsTypeAAAA)
if err != nil && len(addrs) > 0 {
// Ignore error because A lookup succeeded.
err = nil
_, records, err6 = lookup(name, dnsTypeAAAA)
if err4 != nil && err6 == nil {
// Ignore A error because AAAA lookup succeeded.
err4 = nil
}
if err != nil {
return
if err6 != nil && len(addrs) > 0 {
// Ignore AAAA error because A lookup succeeded.
err6 = nil
}
if err4 != nil {
return nil, err4
}
if err6 != nil {
return nil, err6
}
addrs = append(addrs, convertRR_AAAA(records)...)
return
return addrs, nil
}
// goLookupCNAME is the native Go implementation of LookupCNAME.