nslookup: set default DNS server again. Hopefully helps with 675

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 13 insertions, 2 deletions

diff --git a/networking/nslookup.c b/networking/nslookup.c
index f4fd407dd..dd4b1ffed 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -138,6 +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);
 
@@ -181,9 +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:");
 }