58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
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package quicdialer
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import (
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"context"
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"crypto/tls"
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"net"
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"github.com/lucas-clemente/quic-go"
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"github.com/ooni/probe-cli/v3/internal/engine/netx/dialer"
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)
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// DNSDialer is a dialer that uses the configured Resolver to resolve a
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// domain name to IP addresses
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type DNSDialer struct {
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Dialer ContextDialer
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Resolver Resolver
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}
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// DialContext implements ContextDialer.DialContext
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func (d DNSDialer) DialContext(
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ctx context.Context, network, host string,
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tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlySession, error) {
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onlyhost, onlyport, err := net.SplitHostPort(host)
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if err != nil {
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return nil, err
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}
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// TODO(kelmenhorst): Should this be somewhere else?
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// failure if tlsCfg is nil but that should not happen
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if tlsCfg.ServerName == "" {
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tlsCfg.ServerName = onlyhost
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}
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var addrs []string
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addrs, err = d.LookupHost(ctx, onlyhost)
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if err != nil {
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return nil, err
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}
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var errorslist []error
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for _, addr := range addrs {
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target := net.JoinHostPort(addr, onlyport)
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sess, err := d.Dialer.DialContext(
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ctx, network, target, tlsCfg, cfg)
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if err == nil {
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return sess, nil
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}
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errorslist = append(errorslist, err)
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}
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// TODO(bassosimone): maybe ReduceErrors could be in netx/internal.
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return nil, dialer.ReduceErrors(errorslist)
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}
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// LookupHost implements Resolver.LookupHost
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func (d DNSDialer) LookupHost(ctx context.Context, hostname string) ([]string, error) {
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if net.ParseIP(hostname) != nil {
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return []string{hostname}, nil
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}
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return d.Resolver.LookupHost(ctx, hostname)
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}
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