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fix sending to address where the domain does not have an mx record (but where we should connect directly to the host, or follow cname records)

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such deliveries would fail because a canceled "context" was reused, so the dns
lookups would fail.

the tests didn't catch it before because they ignored their context parameters.
This commit is contained in:
Mechiel Lukkien 2023-04-24 10:34:19 +02:00
parent 1f4df30019
commit 74dab5fc39
No known key found for this signature in database
2 changed files with 33 additions and 0 deletions
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30
dns/mock.go
View file

@ -44,6 +44,9 @@ func (r MockResolver) servfail(s string) *net.DNSError {
}
func (r MockResolver) LookupCNAME(ctx context.Context, name string) (string, error) {
if err := ctx.Err(); err != nil {
return "", err
}
if _, ok := r.Fail[Mockreq{"cname", name}]; ok {
return "", r.servfail(name)
}
@ -54,6 +57,9 @@ func (r MockResolver) LookupCNAME(ctx context.Context, name string) (string, err
}
func (r MockResolver) LookupAddr(ctx context.Context, ip string) ([]string, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"ptr", ip}]; ok {
return nil, r.servfail(ip)
}
@ -65,18 +71,30 @@ func (r MockResolver) LookupAddr(ctx context.Context, ip string) ([]string, erro
}
func (r MockResolver) LookupNS(ctx context.Context, name string) ([]*net.NS, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
return nil, r.servfail("ns not implemented")
}
func (r MockResolver) LookupPort(ctx context.Context, network, service string) (port int, err error) {
if err := ctx.Err(); err != nil {
return 0, err
}
return 0, r.servfail("port not implemented")
}
func (r MockResolver) LookupSRV(ctx context.Context, service, proto, name string) (string, []*net.SRV, error) {
if err := ctx.Err(); err != nil {
return "", nil, err
}
return "", nil, r.servfail("srv not implemented")
}
func (r MockResolver) LookupIPAddr(ctx context.Context, host string) ([]net.IPAddr, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"ipaddr", host}]; ok {
return nil, r.servfail(host)
}
@ -96,6 +114,9 @@ func (r MockResolver) LookupIPAddr(ctx context.Context, host string) ([]net.IPAd
}
func (r MockResolver) LookupHost(ctx context.Context, host string) (addrs []string, err error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"host", host}]; ok {
return nil, r.servfail(host)
}
@ -111,6 +132,9 @@ func (r MockResolver) LookupHost(ctx context.Context, host string) (addrs []stri
}
func (r MockResolver) LookupIP(ctx context.Context, network, host string) ([]net.IP, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"ip", host}]; ok {
return nil, r.servfail(host)
}
@ -134,6 +158,9 @@ func (r MockResolver) LookupIP(ctx context.Context, network, host string) ([]net
}
func (r MockResolver) LookupMX(ctx context.Context, name string) ([]*net.MX, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"mx", name}]; ok {
return nil, r.servfail(name)
}
@ -145,6 +172,9 @@ func (r MockResolver) LookupMX(ctx context.Context, name string) ([]*net.MX, err
}
func (r MockResolver) LookupTXT(ctx context.Context, name string) ([]string, error) {
if err := ctx.Err(); err != nil {
return nil, err
}
if _, ok := r.Fail[Mockreq{"txt", name}]; ok {
return nil, r.servfail(name)
}

3
queue/queue.go
View file

@ -658,7 +658,10 @@ func gatherHosts(resolver dns.Resolver, m Msg, cid int64, qlog *mlog.Log) (hosts
}
// No MX record. First attempt CNAME lookup. ../rfc/5321:3838 ../rfc/3974:197
ctx, cancel = context.WithTimeout(cidctx, 30*time.Second)
defer cancel()
cname, err := resolver.LookupCNAME(ctx, effectiveDomain.ASCII+".")
cancel()
if err != nil && !dns.IsNotFound(err) {
return nil, effectiveDomain, false, fmt.Errorf("%w: cname lookup for %s: %v", errDNS, effectiveDomain, err)
}