ConnectByName() function.

byname.go

@@ -0,0 +1,56 @@
+package dane
+
+import (
+ "crypto/tls"
+ "fmt"
+)
+
+//
+// ConnectByName takes a hostname and port, resolves the addresses for
+// the hostname (IPv6 followed by IPv4), and then attempts to connect to
+// them and establish TLS. It returns a TLS connection and dane config for
+// the first address that succeeds.
+//
+// Uses a default DANE configuration. For a custom DANE configuration,
+// use the DialTLS or DialStartTLS functions instead.
+//
+func ConnectByName(hostname string, port int) (*tls.Conn, *Config, error) {
+
+ var conn *tls.Conn
+
+ resolver, err := GetResolver("")
+ if err != nil {
+ return nil, nil, fmt.Errorf("Error obtaining resolver address: %s", err.Error())
+ }
+
+ tlsa, err := GetTLSA(resolver, hostname, port)
+ if err != nil {
+ return nil, nil, fmt.Errorf("GetTLSA: %s", err.Error())
+ }
+
+ needSecure := (tlsa != nil)
+ iplist, err := GetAddresses(resolver, hostname, needSecure)
+ if err != nil {
+ return nil, nil, fmt.Errorf("GetAddresses: %s", err.Error())
+ }
+
+ if len(iplist) == 0 {
+ return nil, nil, fmt.Errorf("No addresses found")
+ }
+
+ for _, ip := range iplist {
+
+ server := NewServer(hostname, ip, port)
+ config := NewConfig()
+ config.SetServer(server)
+ config.SetTLSA(tlsa)
+ conn, err = DialTLS(config)
+ if err != nil {
+ fmt.Printf("Connection failed to %s: %s\n", server.Address(), err.Error())
+ continue
+ }
+ return conn, config, err
+ }
+
+ return conn, nil, fmt.Errorf("Failed to connect to any server address")
+}

byname_test.go

@@ -0,0 +1,31 @@
+package dane
+
+/*
+ * Note: these test routines may not work unless you adapt this file
+ * to use validating DNS resolvers and appropriately configured DANE TLS
+ * servers you have access to.
+ */
+
+import (
+ "fmt"
+ "testing"
+)
+
+func TestConnectByName(t *testing.T) {
+
+ var hostname = "www.example.com"
+ var port = 443
+
+ conn, config, err := ConnectByName(hostname, port)
+ if err != nil {
+ t.Fatalf("%s\n", err.Error())
+ }
+ fmt.Printf("ConnectByName: Success connecting to %s %d\n", hostname, port)
+ if config.Okdane {
+ fmt.Printf("DANE OK\n")
+ } else if config.Okpkix {
+ fmt.Printf("PKIX OK\n")
+ }
+ fmt.Printf("\n")
+ conn.Close()
+}