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net: retry if GetAddrInfoW returns WSTRY_AGAIN when resolving an IP

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GetAddrInfoW is retried now multiple times as per the timeout and number of retries defined in func dnsReadConfig (before it was called only once)

Fixes #55050

Change-Id: If5369ebb164d98557a802de938756dbf9c125773
Reviewed-on: https://go-review.googlesource.com/c/go/+/462051
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Bryan Mills <bcmills@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Run-TryBot: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
This commit is contained in:
zen 2023-01-16 19:52:03 -08:00 committed by Gopher Robot
parent 2994e9aa79
commit 87366feb12
1 changed files with 16 additions and 2 deletions
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18
src/net/lookup_windows.go
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@ -10,10 +10,14 @@ import (
"os"
"runtime"
"syscall"
"time"
"unsafe"
)
const _WSAHOST_NOT_FOUND = syscall.Errno(11001)
const (
_WSAHOST_NOT_FOUND = syscall.Errno(11001)
_WSATRY_AGAIN = syscall.Errno(11002)
)
func winError(call string, err error) error {
switch err {
@ -118,7 +122,17 @@ func (r *Resolver) lookupIP(ctx context.Context, network, name string) ([]IPAddr
if err != nil {
return nil, &DNSError{Name: name, Err: err.Error()}
}
e := syscall.GetAddrInfoW(name16p, nil, &hints, &result)
dnsConf := getSystemDNSConfig()
start := time.Now()
var e error
for i := 0; i < dnsConf.attempts; i++ {
e = syscall.GetAddrInfoW(name16p, nil, &hints, &result)
if e == nil || e != _WSATRY_AGAIN || time.Since(start) > dnsConf.timeout {
break
}
}
if e != nil {
err := winError("getaddrinfow", e)
dnsError := &DNSError{Err: err.Error(), Name: name}