Add SRV lookup for xmpps DNS records.

go-sendxmpp.go

@@ -8,8 +8,10 @@ import (
 	"bufio"
 	"crypto/tls"
 	"errors"
+	"fmt"
 	"io"
 	"log"
+	"net"
 	"os"
 	"os/exec"
 	"os/user"
@@ -286,6 +288,25 @@ func main() {
 		server = *flagServer
 	}
 
+	// Lookup SRV record for xmpps-client if direct TLS is requested and the server is not
+	// specified.
+	if *flagTLS {
+		if _, addrs, err := net.LookupSRV("xmpps-client", "tcp", server); err == nil {
+
+			if len(addrs) > 0 {
+				// Default to first record
+				server = fmt.Sprintf("%s:%d", addrs[0].Target, addrs[0].Port)
+				defP := addrs[0].Priority
+				for _, adr := range addrs {
+					if adr.Priority < defP {
+						server = fmt.Sprintf("%s:%d", adr.Target, adr.Port)
+						defP = adr.Priority
+					}
+				}
+			}
+		}
+	}
+
 	// Use the JIDs server part if no server is specified.
 	if server == "" {
 		server = strings.Split(user, "@")[1]