sulogin: use bb_error_msg instead of bb_info_msg; better message

[oweals/busybox.git] / networking / nslookup.c

diff --git a/networking/nslookup.c b/networking/nslookup.c
index 67fc01547c67d71aeef5c3b01f8b8edc9ca24d2d..dd4b1ffedd29532813cf3827f983d40e6bcffdc2 100644 (file)
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -11,6 +11,20 @@
  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
 
+//usage:#define nslookup_trivial_usage
+//usage:       "[HOST] [SERVER]"
+//usage:#define nslookup_full_usage "\n\n"
+//usage:       "Query the nameserver for the IP address of the given HOST\n"
+//usage:       "optionally using a specified DNS server"
+//usage:
+//usage:#define nslookup_example_usage
+//usage:       "$ nslookup localhost\n"
+//usage:       "Server:     default\n"
+//usage:       "Address:    default\n"
+//usage:       "\n"
+//usage:       "Name:       debian\n"
+//usage:       "Address:    127.0.0.1\n"
+
 #include <resolv.h>
 #include "libbb.h"
 
@@ -124,6 +138,9 @@ static void set_default_dns(const char *server)
 {
        len_and_sockaddr *lsa;
 
+       if (!server)
+               return;
+
        /* NB: this works even with, say, "[::1]:5353"! :) */
        lsa = xhost2sockaddr(server, 53);
 
@@ -167,9 +184,17 @@ int nslookup_main(int argc, char **argv)
        /* (but it also says "may be enabled in /etc/resolv.conf") */
        /*_res.options |= RES_USE_INET6;*/
 
-       if (argv[2])
-               set_default_dns(argv[2]);
+       set_default_dns(argv[2]);
 
        server_print();
+
+       /* getaddrinfo and friends are free to request a resolver
+        * reinitialization. Just in case, set_default_dns() again
+        * after getaddrinfo (in server_print). This reportedly helps
+        * with bug 675 "nslookup does not properly use second argument"
+        * at least on Debian Wheezy and Openwrt AA (eglibc based).
+        */
+       set_default_dns(argv[2]);
+
        return print_host(argv[1], "Name:");
 }