nslookup: glibc + IPv6 address of DNS server don't mix (yet)

1 files changed, 9 insertions, 4 deletions

diff --git a/networking/nslookup.c b/networking/nslookup.c
index 8a820ce37..26287114c 100644
--- a/networking/nslookup.c
+++ b/networking/nslookup.c
@@ -133,14 +133,19 @@ static void set_default_dns(const char *server)
                 _res.nsaddr_list[0] = lsa->u.sin;
         }
 #if ENABLE_FEATURE_IPV6
-// Hoping libc will handle an IPv4 address there too,
-// if it so happens that family is indeed AF_INET
-//      if (lsa->u.sa.sa_family == AF_INET6) {
+        /* Hoped libc can cope with IPv4 address there too.
+         * No such luck, glibc 2.4 segfaults even with IPv6,
+         * maybe I misunderstand how to make glibc use IPv6 addr?
+         * (uclibc 0.9.31+ should work) */
+        if (lsa->u.sa.sa_family == AF_INET6) {
+                // glibc neither SEGVs nor sends any dgrams with this
+                // (strace shows no socket ops):
+                //_res.nscount = 0;
                 _res._u._ext.nscount = 1;
                 /* store a pointer to part of malloc'ed lsa */
                 _res._u._ext.nsaddrs[0] = &lsa->u.sin6;
                 /* must not free(lsa)! */
-//      }
+        }
 #endif
 }