mirror of
https://github.com/fumiama/terasu.git
synced 2026-06-07 10:10:23 +08:00
95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
package tls
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import (
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"context"
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"crypto/tls"
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"errors"
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"net"
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"github.com/fumiama/terasu"
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"github.com/fumiama/terasu/dialer"
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)
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// ErrEmptyHostAddress is returned when DNS lookup for a host returns no addresses
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var ErrEmptyHostAddress = errors.New("empty host addr")
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// DialTLSContextWithConfigAndSystemResolver fills http2.Transport method with terasu and system DNS
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func DialTLSContextWithConfigAndSystemResolver(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
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return DialTLSContextCL(ctx, network, addr, cfg, nil)
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}
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// DialTLSContextCL fills http2.Transport method with terasu
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func DialTLSContextCL(
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ctx context.Context, network, addr string,
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cfg *tls.Config, lookup func(ctx context.Context, host string,
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) (addrs []string, err error)) (net.Conn, error) {
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host, port, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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var addrs []string
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if lookup != nil {
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addrs, err = lookup(ctx, host)
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} else {
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addrs, err = net.DefaultResolver.LookupHost(ctx, host)
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}
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if err != nil {
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return nil, err
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}
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if len(addrs) == 0 {
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return nil, ErrEmptyHostAddress
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}
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if cfg == nil {
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cfg = &tls.Config{
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ServerName: host,
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MinVersion: tls.VersionTLS12,
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}
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}
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var conn net.Conn
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var tlsConn *tls.Conn
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for _, a := range addrs {
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if dialer.DefaultDialer.Timeout != 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(context.Background(), dialer.DefaultDialer.Timeout)
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defer cancel()
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} else if !dialer.DefaultDialer.Deadline.IsZero() {
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var cancel context.CancelFunc
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ctx, cancel = context.WithDeadline(context.Background(), dialer.DefaultDialer.Deadline)
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defer cancel()
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}
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conn, err = dialer.DefaultDialer.DialContext(ctx, network, net.JoinHostPort(a, port))
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if err != nil {
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continue
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}
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tlsConn = tls.Client(terasu.NewConn(conn), cfg)
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// re-init ctx due to deadline settings in tcp dial
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if dialer.DefaultDialer.Timeout != 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(context.Background(), dialer.DefaultDialer.Timeout)
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defer cancel()
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} else if !dialer.DefaultDialer.Deadline.IsZero() {
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var cancel context.CancelFunc
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ctx, cancel = context.WithDeadline(context.Background(), dialer.DefaultDialer.Deadline)
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defer cancel()
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}
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err = tlsConn.HandshakeContext(ctx)
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if err == nil {
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break
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}
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_ = tlsConn.Close()
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tlsConn = nil
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conn, err = dialer.DefaultDialer.DialContext(ctx, network, net.JoinHostPort(a, port))
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if err != nil {
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continue
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}
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tlsConn = tls.Client(terasu.NewConn(conn), cfg)
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err = tlsConn.HandshakeContext(ctx)
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if err == nil {
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break
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}
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_ = tlsConn.Close()
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tlsConn = nil
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}
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return tlsConn, err
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}
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