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net/dnsfallback: do not attempt lookups of IPs.

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Currently if the passed in host is an IP, Lookup still attempts to
resolve it with a dns server. This makes it just return the IP directly.

Updates tailscale/corp#4475

Signed-off-by: Maisem Ali <maisem@tailscale.com>
This commit is contained in:
Maisem Ali 2022-03-24 22:21:41 -07:00 committed by Maisem Ali
parent b45bb577a0
commit b2f269d5b7
1 changed files with 4 additions and 0 deletions
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4
net/dnsfallback/dnsfallback.go
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@ -27,6 +27,10 @@ import (
) )
func Lookup(ctx context.Context, host string) ([]netaddr.IP, error) { func Lookup(ctx context.Context, host string) ([]netaddr.IP, error) {
if ip, err := netaddr.ParseIP(host); err == nil && !ip.IsZero() {
return []netaddr.IP{ip}, nil
}
type nameIP struct { type nameIP struct {
dnsName string dnsName string
ip netaddr.IP ip netaddr.IP