lib-dns: dns_lookup*() - Assert that at least one IP is returned on success

diff --git a/src/lib-dns/dns-lookup.c b/src/lib-dns/dns-lookup.c
index 0cb56325cd491ba91a4b60e81b2624ee6c111b11..393015f2122fb571f4b744a7e4c22bab33dcd785 100644 (file)
--- a/src/lib-dns/dns-lookup.c
+++ b/src/lib-dns/dns-lookup.c
@@ -306,6 +306,7 @@ static void dns_lookup_callback(struct dns_lookup *lookup)
                e->add_str("cached", lookup->cached ? "yes" : "no");
                e_debug(e->event(), "Lookup successful after %u msecs",
                        lookup->result.msecs);
+               i_assert(lookup->ptr_lookup || lookup->result.ips_count > 0);
        }
        lookup->callback(&lookup->result, lookup->context);
 }

diff --git a/src/lib-dns/dns-lookup.h b/src/lib-dns/dns-lookup.h
index 549bc9f0539b4cc6e6dc21bc6485cd947d798cb1..7df1786758eef7f223d5d04fd8f07eea304a84a2 100644 (file)
--- a/src/lib-dns/dns-lookup.h
+++ b/src/lib-dns/dns-lookup.h
@@ -30,7 +30,7 @@ struct dns_lookup_result {
        unsigned int msecs;
 
        /* for IP lookup: */
-       unsigned int ips_count;
+       unsigned int ips_count; /* guaranteed to be >0 on success */
        const struct ip_addr *ips;
        /* for PTR lookup: */
        const char *name;