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Go's LookupAddr will return non-absolute names, seemingly for single-label names from /etc/hosts, turn them into absolute names so our verifying forward lookups can succeed

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Mechiel Lukkien 2023-08-10 11:52:35 +02:00
parent a30d8c1378
commit 6b68920a3a
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1 changed files with 8 additions and 2 deletions
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10
dns/resolver.go
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@ -39,8 +39,8 @@ var (
// Resolver is the interface strict resolver implements.
type Resolver interface {
LookupAddr(ctx context.Context, addr string) ([]string, error)
LookupCNAME(ctx context.Context, host string) (string, error) // NOTE: returns an error if no CNAME record is present.
LookupAddr(ctx context.Context, addr string) ([]string, error) // Always returns absolute names, with trailing dot.
LookupCNAME(ctx context.Context, host string) (string, error) // NOTE: returns an error if no CNAME record is present.
LookupHost(ctx context.Context, host string) (addrs []string, err error)
LookupIP(ctx context.Context, network, host string) ([]net.IP, error)
LookupIPAddr(ctx context.Context, host string) ([]net.IPAddr, error)
@ -131,6 +131,12 @@ func (r StrictResolver) LookupAddr(ctx context.Context, addr string) (resp []str
defer resolveErrorHint(&err)
resp, err = r.resolver().LookupAddr(ctx, addr)
// For addresses from /etc/hosts without dot, we add the missing trailing dot.
for i, s := range resp {
if !strings.HasSuffix(s, ".") {
resp[i] = s + "."
}
}
return
}