* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2013 */
+/* Copyright (c) University of Cambridge 1995 - 2014 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for interfacing with the DNS. */
Arguments:
qualify_single TRUE to set the RES_DEFNAMES option
search_parents TRUE to set the RES_DNSRCH option
+ use_dnssec TRUE to set the RES_USE_DNSSEC option
Returns: nothing
*/
void
-dns_init(BOOL qualify_single, BOOL search_parents)
+dns_init(BOOL qualify_single, BOOL search_parents, BOOL use_dnssec)
{
res_state resp = os_get_dns_resolver_res();
# ifndef RES_USE_EDNS0
# error Have RES_USE_DNSSEC but not RES_USE_EDNS0? Something hinky ...
# endif
+if (use_dnssec)
+ resp->options |= RES_USE_DNSSEC;
if (dns_dnssec_ok >= 0)
{
if (dns_use_edns0 == 0 && dns_dnssec_ok != 0)
DEBUG(D_resolver)
debug_printf("Unable to %sset DNSSEC without resolver support.\n",
dns_dnssec_ok ? "" : "un");
+if (use_dnssec)
+ DEBUG(D_resolver)
+ debug_printf("Unable to set DNSSEC without resolver support.\n");
# endif
#endif /* DISABLE_DNSSEC */
#endif
}
+static void
+dns_set_insecure(dns_answer * dnsa)
+{
+HEADER * h = (HEADER *)dnsa->answer;
+h->ad = 0;
+}
+
+
case T_SRV: return US"SRV";
case T_NS: return US"NS";
case T_CNAME: return US"CNAME";
+ case T_TLSA: return US"TLSA";
default: return US"?";
}
}
uschar *checkname = name;
int ovector[3*(EXPAND_MAXN+1)];
- if (regex_check_dns_names == NULL)
- regex_check_dns_names =
- regex_must_compile(check_dns_names_pattern, FALSE, TRUE);
+ dns_pattern_init();
/* For an SRV lookup, skip over the first two components (the service and
protocol names, which both start with an underscore). */
- if (type == T_SRV)
+ if (type == T_SRV || type == T_TLSA)
{
while (*checkname++ != '.');
while (*checkname++ != '.');
dns_lookup(dns_answer *dnsa, uschar *name, int type, uschar **fully_qualified_name)
{
int i;
-uschar *orig_name = name;
+const uschar *orig_name = name;
+BOOL secure_so_far = TRUE;
/* Loop to follow CNAME chains so far, but no further... */
/* If any data records of the correct type were found, we are done. */
- if (type_rr.data != NULL) return DNS_SUCCEED;
+ if (type_rr.data != NULL)
+ {
+ if (!secure_so_far) /* mark insecure if any element of CNAME chain was */
+ dns_set_insecure(dnsa);
+ return DNS_SUCCEED;
+ }
/* If there are no data records, we need to re-scan the DNS using the
domain given in the CNAME record, which should exist (otherwise we should
if (datalen < 0) return DNS_FAIL;
name = data;
+ if (!dns_is_secure(dnsa))
+ secure_so_far = FALSE;
+
DEBUG(D_dns) debug_printf("CNAME found: change to %s\n", name);
} /* Loop back to do another lookup */
return yield;
}
+
+
+void
+dns_pattern_init(void)
+{
+if (check_dns_names_pattern[0] != 0 && !regex_check_dns_names)
+ regex_check_dns_names =
+ regex_must_compile(check_dns_names_pattern, FALSE, TRUE);
+}
+
+/* vi: aw ai sw=2
+*/
/* End of dns.c */