+#ifdef EXPERIMENTAL_DANE
+int
+tlsa_lookup(const host_item * host, dns_answer * dnsa,
+ BOOL dane_required, BOOL * dane)
+{
+/* move this out to host.c given the similarity to dns_lookup() ? */
+uschar buffer[300];
+const uschar * fullname = buffer;
+
+/* TLSA lookup string */
+(void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port, host->name);
+
+switch (dns_lookup(dnsa, buffer, T_TLSA, &fullname))
+ {
+ case DNS_AGAIN:
+ return DEFER; /* just defer this TLS'd conn */
+
+ default:
+ case DNS_FAIL:
+ if (dane_required)
+ return FAIL;
+ break;
+
+ case DNS_SUCCEED:
+ if (!dns_is_secure(dnsa))
+ {
+ log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
+ return DEFER;
+ }
+ *dane = TRUE;
+ break;
+ }
+return OK;
+}
+#endif
+
+
+
+typedef struct smtp_compare_s
+{
+ uschar *current_sender_address;
+ struct transport_instance *tblock;
+} smtp_compare_t;
+
+/*
+Create a unique string that identifies this message, it is based on
+sender_address, helo_data and tls_certificate if enabled. */
+
+static uschar *
+smtp_local_identity(uschar * sender, struct transport_instance * tblock)
+{
+address_item * addr1;
+uschar * if1 = US"";
+uschar * helo1 = US"";
+#ifdef SUPPORT_TLS
+uschar * tlsc1 = US"";
+#endif
+uschar * save_sender_address = sender_address;
+uschar * local_identity = NULL;
+smtp_transport_options_block * ob =
+ (smtp_transport_options_block *)tblock->options_block;
+
+sender_address = sender;
+
+addr1 = deliver_make_addr (sender, TRUE);
+deliver_set_expansions(addr1);
+
+if (ob->interface)
+ if1 = expand_string(ob->interface);
+
+if (ob->helo_data)
+ helo1 = expand_string(ob->helo_data);
+
+#ifdef SUPPORT_TLS
+if (ob->tls_certificate)
+ tlsc1 = expand_string(ob->tls_certificate);
+local_identity = string_sprintf ("%s^%s^%s", if1, helo1, tlsc1);
+#else
+local_identity = string_sprintf ("%s^%s", if1, helo1);
+#endif
+
+deliver_set_expansions(NULL);
+sender_address = save_sender_address;
+
+return local_identity;
+}
+
+
+
+/* This routine is a callback that is called from transport_check_waiting.
+This function will evaluate the incoming message versus the previous
+message. If the incoming message is using a different local identity then
+we will veto this new message. */
+
+static BOOL
+smtp_are_same_identities(uschar * message_id, smtp_compare_t * s_compare)
+{
+uschar * save_sender_address = sender_address;
+uschar * current_local_identity =
+ smtp_local_identity(s_compare->current_sender_address, s_compare->tblock);
+uschar * new_sender_address = deliver_get_sender_address(message_id);
+uschar * message_local_identity =
+ smtp_local_identity(new_sender_address, s_compare->tblock);
+
+sender_address = save_sender_address;
+
+return Ustrcmp(current_local_identity, message_local_identity) == 0;
+}
+
+
+
projects / exim.git / blobdiff