Redesigned Client API around net.Dialer (#511)
* Redesigned Client API around net.Dialer * Moved Dialer under Client; reverted msgHash; removed unneeded deprecation * Reverted client_compat.go into client.go and renamed dialer variable * Shortened comment lines * Erroneously removed pointer declaration
This commit is contained in:
parent
032fbabc82
commit
aade52d68e
334
client.go
334
client.go
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@ -9,6 +9,7 @@ import (
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"encoding/binary"
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"io"
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"net"
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"strings"
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"time"
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)
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@ -30,8 +31,12 @@ type Client struct {
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Net string // if "tcp" or "tcp-tls" (DNS over TLS) a TCP query will be initiated, otherwise an UDP one (default is "" for UDP)
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UDPSize uint16 // minimum receive buffer for UDP messages
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TLSConfig *tls.Config // TLS connection configuration
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Timeout time.Duration // a cumulative timeout for dial, write and read, defaults to 0 (disabled) - overrides DialTimeout, ReadTimeout and WriteTimeout when non-zero
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DialTimeout time.Duration // net.DialTimeout, defaults to 2 seconds - overridden by Timeout when that value is non-zero
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Dialer *net.Dialer // a net.Dialer used to set local address, timeouts and more
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// Timeout is a cumulative timeout for dial, write and read, defaults to 0 (disabled) - overrides DialTimeout, ReadTimeout,
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// WriteTimeout when non-zero. Can be overridden with net.Dialer.Timeout (see Client.ExchangeWithDialer and
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// Client.Dialer) or context.Context.Deadline (see the deprecated ExchangeContext)
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Timeout time.Duration
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DialTimeout time.Duration // net.DialTimeout, defaults to 2 seconds, or net.Dialer.Timeout if expiring earlier - overridden by Timeout when that value is non-zero
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ReadTimeout time.Duration // net.Conn.SetReadTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero
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WriteTimeout time.Duration // net.Conn.SetWriteTimeout value for connections, defaults to 2 seconds - overridden by Timeout when that value is non-zero
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TsigSecret map[string]string // secret(s) for Tsig map[<zonename>]<base64 secret>, zonename must be fully qualified
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@ -44,140 +49,11 @@ type Client struct {
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// will it fall back to TCP in case of truncation.
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// See client.Exchange for more information on setting larger buffer sizes.
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func Exchange(m *Msg, a string) (r *Msg, err error) {
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var co *Conn
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co, err = DialTimeout("udp", a, dnsTimeout)
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if err != nil {
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return nil, err
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}
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defer co.Close()
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opt := m.IsEdns0()
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// If EDNS0 is used use that for size.
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if opt != nil && opt.UDPSize() >= MinMsgSize {
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co.UDPSize = opt.UDPSize()
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}
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co.SetWriteDeadline(time.Now().Add(dnsTimeout))
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if err = co.WriteMsg(m); err != nil {
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return nil, err
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}
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co.SetReadDeadline(time.Now().Add(dnsTimeout))
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r, err = co.ReadMsg()
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if err == nil && r.Id != m.Id {
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err = ErrId
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}
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client := Client{Net: "udp"}
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r, _, err = client.Exchange(m, a)
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return r, err
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}
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// ExchangeContext performs a synchronous UDP query, like Exchange. It
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// additionally obeys deadlines from the passed Context.
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func ExchangeContext(ctx context.Context, m *Msg, a string) (r *Msg, err error) {
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// Combine context deadline with built-in timeout. Context chooses whichever
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// is sooner.
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timeoutCtx, cancel := context.WithTimeout(ctx, dnsTimeout)
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defer cancel()
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deadline, _ := timeoutCtx.Deadline()
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co := new(Conn)
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dialer := net.Dialer{}
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co.Conn, err = dialer.DialContext(timeoutCtx, "udp", a)
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if err != nil {
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return nil, err
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}
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defer co.Conn.Close()
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opt := m.IsEdns0()
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// If EDNS0 is used use that for size.
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if opt != nil && opt.UDPSize() >= MinMsgSize {
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co.UDPSize = opt.UDPSize()
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}
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co.SetWriteDeadline(deadline)
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if err = co.WriteMsg(m); err != nil {
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return nil, err
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}
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co.SetReadDeadline(deadline)
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r, err = co.ReadMsg()
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if err == nil && r.Id != m.Id {
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err = ErrId
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}
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return r, err
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}
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// ExchangeConn performs a synchronous query. It sends the message m via the connection
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// c and waits for a reply. The connection c is not closed by ExchangeConn.
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// This function is going away, but can easily be mimicked:
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//
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// co := &dns.Conn{Conn: c} // c is your net.Conn
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// co.WriteMsg(m)
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// in, _ := co.ReadMsg()
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// co.Close()
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//
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func ExchangeConn(c net.Conn, m *Msg) (r *Msg, err error) {
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println("dns: this function is deprecated")
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co := new(Conn)
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co.Conn = c
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if err = co.WriteMsg(m); err != nil {
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return nil, err
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}
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r, err = co.ReadMsg()
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if err == nil && r.Id != m.Id {
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err = ErrId
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}
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return r, err
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}
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// Exchange performs a synchronous query. It sends the message m to the address
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// contained in a and waits for a reply. Basic use pattern with a *dns.Client:
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//
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// c := new(dns.Client)
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// in, rtt, err := c.Exchange(message, "127.0.0.1:53")
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//
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// Exchange does not retry a failed query, nor will it fall back to TCP in
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// case of truncation.
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// It is up to the caller to create a message that allows for larger responses to be
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// returned. Specifically this means adding an EDNS0 OPT RR that will advertise a larger
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// buffer, see SetEdns0. Messages without an OPT RR will fallback to the historic limit
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// of 512 bytes.
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func (c *Client) Exchange(m *Msg, a string) (r *Msg, rtt time.Duration, err error) {
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return c.ExchangeContext(context.Background(), m, a)
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}
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// ExchangeContext acts like Exchange, but honors the deadline on the provided
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// context, if present. If there is both a context deadline and a configured
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// timeout on the client, the earliest of the two takes effect.
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func (c *Client) ExchangeContext(ctx context.Context, m *Msg, a string) (
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r *Msg,
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rtt time.Duration,
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err error) {
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if !c.SingleInflight {
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return c.exchange(ctx, m, a)
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}
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// This adds a bunch of garbage, TODO(miek).
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t := "nop"
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if t1, ok := TypeToString[m.Question[0].Qtype]; ok {
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t = t1
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}
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cl := "nop"
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if cl1, ok := ClassToString[m.Question[0].Qclass]; ok {
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cl = cl1
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}
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r, rtt, err, shared := c.group.Do(m.Question[0].Name+t+cl, func() (*Msg, time.Duration, error) {
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return c.exchange(ctx, m, a)
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})
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if r != nil && shared {
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r = r.Copy()
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}
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if err != nil {
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return r, rtt, err
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}
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return r, rtt, nil
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}
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func (c *Client) dialTimeout() time.Duration {
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if c.Timeout != 0 {
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return c.Timeout
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@ -202,40 +78,87 @@ func (c *Client) writeTimeout() time.Duration {
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return dnsTimeout
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}
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func (c *Client) exchange(ctx context.Context, m *Msg, a string) (r *Msg, rtt time.Duration, err error) {
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var co *Conn
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func (c *Client) Dial(address string) (conn *Conn, err error) {
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// create a new dialer with the appropriate timeout
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var d net.Dialer
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if c.Dialer == nil {
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d = net.Dialer{}
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} else {
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d = net.Dialer(*c.Dialer)
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}
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d.Timeout = c.getTimeoutForRequest(c.writeTimeout())
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network := "udp"
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tls := false
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useTLS := false
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switch c.Net {
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case "tcp-tls":
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network = "tcp"
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tls = true
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useTLS = true
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case "tcp4-tls":
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network = "tcp4"
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tls = true
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useTLS = true
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case "tcp6-tls":
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network = "tcp6"
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tls = true
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useTLS = true
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default:
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if c.Net != "" {
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network = c.Net
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}
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}
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var deadline time.Time
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if c.Timeout != 0 {
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deadline = time.Now().Add(c.Timeout)
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}
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dialDeadline := deadlineOrTimeoutOrCtx(ctx, deadline, c.dialTimeout())
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dialTimeout := dialDeadline.Sub(time.Now())
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if tls {
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co, err = DialTimeoutWithTLS(network, a, c.TLSConfig, dialTimeout)
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conn = new(Conn)
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if useTLS {
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conn.Conn, err = tls.DialWithDialer(&d, network, address, c.TLSConfig)
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} else {
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co, err = DialTimeout(network, a, dialTimeout)
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conn.Conn, err = d.Dial(network, address)
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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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return conn, nil
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}
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// Exchange performs a synchronous query. It sends the message m to the address
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// contained in a and waits for a reply. Basic use pattern with a *dns.Client:
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//
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// c := new(dns.Client)
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// in, rtt, err := c.Exchange(message, "127.0.0.1:53")
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//
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// Exchange does not retry a failed query, nor will it fall back to TCP in
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// case of truncation.
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// It is up to the caller to create a message that allows for larger responses to be
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// returned. Specifically this means adding an EDNS0 OPT RR that will advertise a larger
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// buffer, see SetEdns0. Messages without an OPT RR will fallback to the historic limit
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// of 512 bytes
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// To specify a local address or a timeout, the caller has to set the `Client.Dialer`
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// attribute appropriately
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func (c *Client) Exchange(m *Msg, address string) (r *Msg, rtt time.Duration, err error) {
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if !c.SingleInflight {
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return c.exchange(m, address)
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}
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t := "nop"
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if t1, ok := TypeToString[m.Question[0].Qtype]; ok {
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t = t1
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}
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cl := "nop"
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if cl1, ok := ClassToString[m.Question[0].Qclass]; ok {
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cl = cl1
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}
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r, rtt, err, shared := c.group.Do(m.Question[0].Name+t+cl, func() (*Msg, time.Duration, error) {
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return c.exchange(m, address)
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})
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if r != nil && shared {
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r = r.Copy()
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}
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return r, rtt, err
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}
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func (c *Client) exchange(m *Msg, a string) (r *Msg, rtt time.Duration, err error) {
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var co *Conn
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co, err = c.Dial(a)
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if err != nil {
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return nil, 0, err
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@ -253,12 +176,13 @@ func (c *Client) exchange(ctx context.Context, m *Msg, a string) (r *Msg, rtt ti
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}
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co.TsigSecret = c.TsigSecret
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co.SetWriteDeadline(deadlineOrTimeoutOrCtx(ctx, deadline, c.writeTimeout()))
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// write with the appropriate write timeout
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co.SetWriteDeadline(time.Now().Add(c.getTimeoutForRequest(c.writeTimeout())))
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if err = co.WriteMsg(m); err != nil {
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return nil, 0, err
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}
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co.SetReadDeadline(deadlineOrTimeoutOrCtx(ctx, deadline, c.readTimeout()))
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co.SetReadDeadline(time.Now().Add(c.getTimeoutForRequest(c.readTimeout())))
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r, err = co.ReadMsg()
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if err == nil && r.Id != m.Id {
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err = ErrId
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@ -352,7 +276,7 @@ func tcpMsgLen(t io.Reader) (int, error) {
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return 0, err
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}
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// As seen with my local router/switch, retursn 1 byte on the above read,
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// As seen with my local router/switch, returns 1 byte on the above read,
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// resulting a a ShortRead. Just write it out (instead of loop) and read the
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// other byte.
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if n == 1 {
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@ -467,6 +391,24 @@ func (co *Conn) Write(p []byte) (n int, err error) {
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return n, err
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}
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// Return the appropriate timeout for a specific request
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func (c *Client) getTimeoutForRequest(timeout time.Duration) time.Duration {
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var requestTimeout time.Duration
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if c.Timeout != 0 {
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requestTimeout = c.Timeout
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} else {
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requestTimeout = timeout
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}
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// net.Dialer.Timeout has priority if smaller than the timeouts computed so
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// far
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if c.Dialer != nil && c.Dialer.Timeout != 0 {
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if c.Dialer.Timeout < requestTimeout {
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requestTimeout = c.Dialer.Timeout
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}
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}
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return requestTimeout
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}
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// Dial connects to the address on the named network.
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func Dial(network, address string) (conn *Conn, err error) {
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conn = new(Conn)
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@ -477,10 +419,44 @@ func Dial(network, address string) (conn *Conn, err error) {
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return conn, nil
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}
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// ExchangeContext performs a synchronous UDP query, like Exchange. It
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// additionally obeys deadlines from the passed Context.
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func ExchangeContext(ctx context.Context, m *Msg, a string) (r *Msg, err error) {
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client := Client{Net: "udp"}
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r, _, err = client.ExchangeContext(ctx, m, a)
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// ignorint rtt to leave the original ExchangeContext API unchanged, but
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// this function will go away
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return r, err
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}
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// ExchangeConn performs a synchronous query. It sends the message m via the connection
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// c and waits for a reply. The connection c is not closed by ExchangeConn.
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// This function is going away, but can easily be mimicked:
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//
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// co := &dns.Conn{Conn: c} // c is your net.Conn
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// co.WriteMsg(m)
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// in, _ := co.ReadMsg()
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// co.Close()
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//
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func ExchangeConn(c net.Conn, m *Msg) (r *Msg, err error) {
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println("dns: ExchangeConn: this function is deprecated")
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co := new(Conn)
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co.Conn = c
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if err = co.WriteMsg(m); err != nil {
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return nil, err
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}
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r, err = co.ReadMsg()
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if err == nil && r.Id != m.Id {
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err = ErrId
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}
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return r, err
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}
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// DialTimeout acts like Dial but takes a timeout.
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func DialTimeout(network, address string, timeout time.Duration) (conn *Conn, err error) {
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conn = new(Conn)
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conn.Conn, err = net.DialTimeout(network, address, timeout)
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client := Client{Net: "udp", Dialer: &net.Dialer{Timeout: timeout}}
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conn, err = client.Dial(address)
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if err != nil {
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return nil, err
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}
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@ -489,8 +465,12 @@ func DialTimeout(network, address string, timeout time.Duration) (conn *Conn, er
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// DialWithTLS connects to the address on the named network with TLS.
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func DialWithTLS(network, address string, tlsConfig *tls.Config) (conn *Conn, err error) {
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conn = new(Conn)
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conn.Conn, err = tls.Dial(network, address, tlsConfig)
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if !strings.HasSuffix(network, "-tls") {
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network += "-tls"
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}
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client := Client{Net: network, TLSConfig: tlsConfig}
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conn, err = client.Dial(address)
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if err != nil {
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return nil, err
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}
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@ -499,33 +479,29 @@ func DialWithTLS(network, address string, tlsConfig *tls.Config) (conn *Conn, er
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// DialTimeoutWithTLS acts like DialWithTLS but takes a timeout.
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func DialTimeoutWithTLS(network, address string, tlsConfig *tls.Config, timeout time.Duration) (conn *Conn, err error) {
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var dialer net.Dialer
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dialer.Timeout = timeout
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conn = new(Conn)
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conn.Conn, err = tls.DialWithDialer(&dialer, network, address, tlsConfig)
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if !strings.HasSuffix(network, "-tls") {
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network += "-tls"
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}
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client := Client{Net: network, Dialer: &net.Dialer{Timeout: timeout}, TLSConfig: tlsConfig}
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conn, err = client.Dial(address)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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// deadlineOrTimeout chooses between the provided deadline and timeout
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// by always preferring the deadline so long as it's non-zero (regardless
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// of which is bigger), and returns the equivalent deadline value.
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func deadlineOrTimeout(deadline time.Time, timeout time.Duration) time.Time {
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if deadline.IsZero() {
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return time.Now().Add(timeout)
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// ExchangeContext acts like Exchange, but honors the deadline on the provided
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// context, if present. If there is both a context deadline and a configured
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// timeout on the client, the earliest of the two takes effect.
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func (c *Client) ExchangeContext(ctx context.Context, m *Msg, a string) (r *Msg, rtt time.Duration, err error) {
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var timeout time.Duration
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if deadline, ok := ctx.Deadline(); !ok {
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timeout = 0
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} else {
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timeout = deadline.Sub(time.Now())
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}
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return deadline
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}
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// deadlineOrTimeoutOrCtx returns the earliest of: a context deadline, or the
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// output of deadlineOrtimeout.
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func deadlineOrTimeoutOrCtx(ctx context.Context, deadline time.Time, timeout time.Duration) time.Time {
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result := deadlineOrTimeout(deadline, timeout)
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if ctxDeadline, ok := ctx.Deadline(); ok && ctxDeadline.Before(result) {
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result = ctxDeadline
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}
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return result
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// not passing the context to the underlying calls, as the API does not support
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// context. For timeouts you should set up Client.Dialer and call Client.Exchange.
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c.Dialer = &net.Dialer{Timeout: timeout}
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return c.Exchange(m, a)
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}
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|
168
client_test.go
168
client_test.go
|
@ -11,6 +11,29 @@ import (
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"time"
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)
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|
||||
func TestDialUDP(t *testing.T) {
|
||||
HandleFunc("miek.nl.", HelloServer)
|
||||
defer HandleRemove("miek.nl.")
|
||||
|
||||
s, addrstr, err := RunLocalUDPServer("[::1]:0")
|
||||
if err != nil {
|
||||
t.Fatalf("unable to run test server: %v", err)
|
||||
}
|
||||
defer s.Shutdown()
|
||||
|
||||
m := new(Msg)
|
||||
m.SetQuestion("miek.nl.", TypeSOA)
|
||||
|
||||
c := new(Client)
|
||||
conn, err := c.Dial(addrstr)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to dial: %v", err)
|
||||
}
|
||||
if conn == nil {
|
||||
t.Fatalf("conn is nil")
|
||||
}
|
||||
}
|
||||
|
||||
func TestClientSync(t *testing.T) {
|
||||
HandleFunc("miek.nl.", HelloServer)
|
||||
defer HandleRemove("miek.nl.")
|
||||
|
@ -27,9 +50,12 @@ func TestClientSync(t *testing.T) {
|
|||
c := new(Client)
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Errorf("failed to exchange: %v", err)
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
if r != nil && r.Rcode != RcodeSuccess {
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
// And now with plain Exchange().
|
||||
|
@ -42,7 +68,42 @@ func TestClientSync(t *testing.T) {
|
|||
}
|
||||
}
|
||||
|
||||
func TestClientTLSSync(t *testing.T) {
|
||||
func TestClientLocalAddress(t *testing.T) {
|
||||
HandleFunc("miek.nl.", HelloServerEchoAddrPort)
|
||||
defer HandleRemove("miek.nl.")
|
||||
|
||||
s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
|
||||
if err != nil {
|
||||
t.Fatalf("unable to run test server: %v", err)
|
||||
}
|
||||
defer s.Shutdown()
|
||||
|
||||
m := new(Msg)
|
||||
m.SetQuestion("miek.nl.", TypeSOA)
|
||||
|
||||
c := new(Client)
|
||||
laddr := net.UDPAddr{IP: net.ParseIP("127.0.0.1"), Port: 12345, Zone: ""}
|
||||
c.Dialer = &net.Dialer{LocalAddr: &laddr}
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Errorf("failed to exchange: %v", err)
|
||||
}
|
||||
if r != nil && r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
if len(r.Extra) != 1 {
|
||||
t.Errorf("failed to get additional answers\n%v", r)
|
||||
}
|
||||
txt := r.Extra[0].(*TXT)
|
||||
if txt == nil {
|
||||
t.Errorf("invalid TXT response\n%v", txt)
|
||||
}
|
||||
if len(txt.Txt) != 1 || txt.Txt[0] != "127.0.0.1:12345" {
|
||||
t.Errorf("invalid TXT response\n%v", txt.Txt)
|
||||
}
|
||||
}
|
||||
|
||||
func TestClientTLSSyncV4(t *testing.T) {
|
||||
HandleFunc("miek.nl.", HelloServer)
|
||||
defer HandleRemove("miek.nl.")
|
||||
|
||||
|
@ -65,6 +126,8 @@ func TestClientTLSSync(t *testing.T) {
|
|||
m.SetQuestion("miek.nl.", TypeSOA)
|
||||
|
||||
c := new(Client)
|
||||
|
||||
// test tcp-tls
|
||||
c.Net = "tcp-tls"
|
||||
c.TLSConfig = &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
|
@ -72,9 +135,88 @@ func TestClientTLSSync(t *testing.T) {
|
|||
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Errorf("failed to exchange: %v", err)
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
if r != nil && r.Rcode != RcodeSuccess {
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
|
||||
// test tcp4-tls
|
||||
c.Net = "tcp4-tls"
|
||||
c.TLSConfig = &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
}
|
||||
|
||||
r, _, err = c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
}
|
||||
|
||||
func TestClientTLSSyncV6(t *testing.T) {
|
||||
HandleFunc("miek.nl.", HelloServer)
|
||||
defer HandleRemove("miek.nl.")
|
||||
|
||||
cert, err := tls.X509KeyPair(CertPEMBlock, KeyPEMBlock)
|
||||
if err != nil {
|
||||
t.Fatalf("unable to build certificate: %v", err)
|
||||
}
|
||||
|
||||
config := tls.Config{
|
||||
Certificates: []tls.Certificate{cert},
|
||||
}
|
||||
|
||||
s, addrstr, err := RunLocalTLSServer("[::1]:0", &config)
|
||||
if err != nil {
|
||||
t.Fatalf("unable to run test server: %v", err)
|
||||
}
|
||||
defer s.Shutdown()
|
||||
|
||||
m := new(Msg)
|
||||
m.SetQuestion("miek.nl.", TypeSOA)
|
||||
|
||||
c := new(Client)
|
||||
|
||||
// test tcp-tls
|
||||
c.Net = "tcp-tls"
|
||||
c.TLSConfig = &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
}
|
||||
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
|
||||
// test tcp6-tls
|
||||
c.Net = "tcp6-tls"
|
||||
c.TLSConfig = &tls.Config{
|
||||
InsecureSkipVerify: true,
|
||||
}
|
||||
|
||||
r, _, err = c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
}
|
||||
}
|
||||
|
@ -120,11 +262,11 @@ func TestClientEDNS0(t *testing.T) {
|
|||
c := new(Client)
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Errorf("failed to exchange: %v", err)
|
||||
t.Fatalf("failed to exchange: %v", err)
|
||||
}
|
||||
|
||||
if r != nil && r.Rcode != RcodeSuccess {
|
||||
t.Errorf("failed to get an valid answer\n%v", r)
|
||||
t.Errorf("failed to get a valid answer\n%v", r)
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -171,11 +313,14 @@ func TestClientEDNS0Local(t *testing.T) {
|
|||
c := new(Client)
|
||||
r, _, err := c.Exchange(m, addrstr)
|
||||
if err != nil {
|
||||
t.Errorf("failed to exchange: %s", err)
|
||||
t.Fatalf("failed to exchange: %s", err)
|
||||
}
|
||||
|
||||
if r != nil && r.Rcode != RcodeSuccess {
|
||||
t.Error("failed to get a valid answer")
|
||||
if r == nil {
|
||||
t.Fatal("response is nil")
|
||||
}
|
||||
if r.Rcode != RcodeSuccess {
|
||||
t.Fatal("failed to get a valid answer")
|
||||
t.Logf("%v\n", r)
|
||||
}
|
||||
|
||||
|
@ -513,6 +658,9 @@ func TestConcurrentExchanges(t *testing.T) {
|
|||
for i := 0; i < len(r); i++ {
|
||||
go func(i int) {
|
||||
r[i], _, _ = c.Exchange(m.Copy(), addrstr)
|
||||
if r[i] == nil {
|
||||
t.Fatalf("response %d is nil", i)
|
||||
}
|
||||
wg.Done()
|
||||
}(i)
|
||||
}
|
||||
|
|
22
doc.go
22
doc.go
|
@ -1,7 +1,7 @@
|
|||
/*
|
||||
Package dns implements a full featured interface to the Domain Name System.
|
||||
Server- and client-side programming is supported.
|
||||
The package allows complete control over what is send out to the DNS. The package
|
||||
The package allows complete control over what is sent out to the DNS. The package
|
||||
API follows the less-is-more principle, by presenting a small, clean interface.
|
||||
|
||||
The package dns supports (asynchronous) querying/replying, incoming/outgoing zone transfers,
|
||||
|
@ -51,7 +51,7 @@ The following is slightly more verbose, but more flexible:
|
|||
m1.Question = make([]dns.Question, 1)
|
||||
m1.Question[0] = dns.Question{"miek.nl.", dns.TypeMX, dns.ClassINET}
|
||||
|
||||
After creating a message it can be send.
|
||||
After creating a message it can be sent.
|
||||
Basic use pattern for synchronous querying the DNS at a
|
||||
server configured on 127.0.0.1 and port 53:
|
||||
|
||||
|
@ -63,7 +63,23 @@ class) is as easy as setting:
|
|||
|
||||
c.SingleInflight = true
|
||||
|
||||
If these "advanced" features are not needed, a simple UDP query can be send,
|
||||
More advanced options are availabe using a net.Dialer and the corresponding API.
|
||||
For example it is possible to set a timeout, or to specify a source IP address
|
||||
and port to use for the connection:
|
||||
|
||||
c := new(dns.Client)
|
||||
laddr := net.UDPAddr{
|
||||
IP: net.ParseIP("[::1]"),
|
||||
Port: 12345,
|
||||
Zone: "",
|
||||
}
|
||||
d := net.Dialer{
|
||||
Timeout: 200 * time.Millisecond,
|
||||
LocalAddr: &laddr,
|
||||
}
|
||||
in, rtt, err := c.ExchangeWithDialer(&d, m1, "8.8.8.8:53")
|
||||
|
||||
If these "advanced" features are not needed, a simple UDP query can be sent,
|
||||
with:
|
||||
|
||||
in, err := dns.Exchange(m1, "127.0.0.1:53")
|
||||
|
|
|
@ -30,6 +30,16 @@ func HelloServerBadID(w ResponseWriter, req *Msg) {
|
|||
w.WriteMsg(m)
|
||||
}
|
||||
|
||||
func HelloServerEchoAddrPort(w ResponseWriter, req *Msg) {
|
||||
m := new(Msg)
|
||||
m.SetReply(req)
|
||||
|
||||
remoteAddr := w.RemoteAddr().String()
|
||||
m.Extra = make([]RR, 1)
|
||||
m.Extra[0] = &TXT{Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeTXT, Class: ClassINET, Ttl: 0}, Txt: []string{remoteAddr}}
|
||||
w.WriteMsg(m)
|
||||
}
|
||||
|
||||
func AnotherHelloServer(w ResponseWriter, req *Msg) {
|
||||
m := new(Msg)
|
||||
m.SetReply(req)
|
||||
|
|
Loading…
Reference in New Issue