1 files changed, 105 insertions, 0 deletions
diff --git a/src/pkg/net/lookup.go b/src/pkg/net/lookup.go
new file mode 100644
index 000000000..bec93ec08
--- /dev/null
+++ b/src/pkg/net/lookup.go
@@ -0,0 +1,105 @@
+// Copyright 2012 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+	"time"
+)
+
+// LookupHost looks up the given host using the local resolver.
+// It returns an array of that host's addresses.
+func LookupHost(host string) (addrs []string, err error) {
+	return lookupHost(host)
+}
+
+func lookupHostDeadline(host string, deadline time.Time) (addrs []string, err error) {
+	if deadline.IsZero() {
+		return lookupHost(host)
+	}
+
+	// TODO(bradfitz): consider pushing the deadline down into the
+	// name resolution functions. But that involves fixing it for
+	// the native Go resolver, cgo, Windows, etc.
+	//
+	// In the meantime, just use a goroutine. Most users affected
+	// by http://golang.org/issue/2631 are due to TCP connections
+	// to unresponsive hosts, not DNS.
+	timeout := deadline.Sub(time.Now())
+	if timeout <= 0 {
+		err = errTimeout
+		return
+	}
+	t := time.NewTimer(timeout)
+	defer t.Stop()
+	type res struct {
+		addrs []string
+		err   error
+	}
+	resc := make(chan res, 1)
+	go func() {
+		a, err := lookupHost(host)
+		resc <- res{a, err}
+	}()
+	select {
+	case <-t.C:
+		err = errTimeout
+	case r := <-resc:
+		addrs, err = r.addrs, r.err
+	}
+	return
+}
+
+// LookupIP looks up host using the local resolver.
+// It returns an array of that host's IPv4 and IPv6 addresses.
+func LookupIP(host string) (addrs []IP, err error) {
+	return lookupIP(host)
+}
+
+// LookupPort looks up the port for the given network and service.
+func LookupPort(network, service string) (port int, err error) {
+	return lookupPort(network, service)
+}
+
+// LookupCNAME returns the canonical DNS host for the given name.
+// Callers that do not care about the canonical name can call
+// LookupHost or LookupIP directly; both take care of resolving
+// the canonical name as part of the lookup.
+func LookupCNAME(name string) (cname string, err error) {
+	return lookupCNAME(name)
+}
+
+// LookupSRV tries to resolve an SRV query of the given service,
+// protocol, and domain name.  The proto is "tcp" or "udp".
+// The returned records are sorted by priority and randomized
+// by weight within a priority.
+//
+// LookupSRV constructs the DNS name to look up following RFC 2782.
+// That is, it looks up _service._proto.name.  To accommodate services
+// publishing SRV records under non-standard names, if both service
+// and proto are empty strings, LookupSRV looks up name directly.
+func LookupSRV(service, proto, name string) (cname string, addrs []*SRV, err error) {
+	return lookupSRV(service, proto, name)
+}
+
+// LookupMX returns the DNS MX records for the given domain name sorted by preference.
+func LookupMX(name string) (mx []*MX, err error) {
+	return lookupMX(name)
+}
+
+// LookupNS returns the DNS NS records for the given domain name.
+func LookupNS(name string) (ns []*NS, err error) {
+	return lookupNS(name)
+}
+
+// LookupTXT returns the DNS TXT records for the given domain name.
+func LookupTXT(name string) (txt []string, err error) {
+	return lookupTXT(name)
+}
+
+// LookupAddr performs a reverse lookup for the given address, returning a list
+// of names mapping to that address.
+func LookupAddr(addr string) (name []string, err error) {
+	return lookupAddr(addr)
+}