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-rw-r--r--src/routers/rf_get_transport.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/src/routers/rf_get_transport.c b/src/routers/rf_get_transport.c
new file mode 100644
index 0000000..4a43818
--- /dev/null
+++ b/src/routers/rf_get_transport.c
@@ -0,0 +1,96 @@
+/*************************************************
+* Exim - an Internet mail transport agent *
+*************************************************/
+
+/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "../exim.h"
+#include "rf_functions.h"
+
+
+/*************************************************
+* Get transport for a router *
+*************************************************/
+
+/* If transport_name contains $, it must be expanded each time and used as a
+transport name. Otherwise, look up the transport only if the destination is not
+already set.
+
+Some routers (e.g. accept) insist that their transport option is set at
+initialization time. However, for some (e.g. file_transport in redirect), there
+is no such check, because the transport may not be required. Calls to this
+function from the former type of router have require_name = NULL, because it
+will never be used. NULL is also used in verify_only cases, where a transport
+is not required.
+
+Arguments:
+ tpname the text of the transport name
+ tpptr where to put the transport
+ addr the address being processed
+ router_name for error messages
+ require_name used in the error message if transport is unset
+
+Returns: TRUE if *tpptr is already set and tpname has no '$' in it;
+ TRUE if a transport has been placed in tpptr;
+ FALSE if there's a problem, in which case
+ addr->message contains a message, and addr->basic_errno has
+ ERRNO_BADTRANSPORT set in it.
+*/
+
+BOOL
+rf_get_transport(uschar *tpname, transport_instance **tpptr, address_item *addr,
+ uschar *router_name, uschar *require_name)
+{
+uschar *ss;
+BOOL expandable;
+
+if (!tpname)
+ {
+ if (!require_name) return TRUE;
+ addr->basic_errno = ERRNO_BADTRANSPORT;
+ addr->message = string_sprintf("%s unset in %s router", require_name,
+ router_name);
+ return FALSE;
+ }
+
+expandable = Ustrchr(tpname, '$') != NULL;
+if (*tpptr != NULL && !expandable) return TRUE;
+
+if (expandable)
+ {
+ if (!(ss = expand_string(tpname)))
+ {
+ addr->basic_errno = ERRNO_BADTRANSPORT;
+ addr->message = string_sprintf("failed to expand transport "
+ "\"%s\" in %s router: %s", tpname, router_name, expand_string_message);
+ return FALSE;
+ }
+ if (is_tainted(ss))
+ {
+ log_write(0, LOG_MAIN|LOG_PANIC,
+ "attempt to use tainted value '%s' from '%s' for transport", ss, tpname);
+ addr->basic_errno = ERRNO_BADTRANSPORT;
+ /* Avoid leaking info to an attacker */
+ addr->message = US"internal configuration error";
+ return FALSE;
+ }
+ }
+else
+ ss = tpname;
+
+for (transport_instance * tp = transports; tp; tp = tp->next)
+ if (Ustrcmp(tp->name, ss) == 0)
+ {
+ DEBUG(D_route) debug_printf("set transport %s\n", ss);
+ *tpptr = tp;
+ return TRUE;
+ }
+
+addr->basic_errno = ERRNO_BADTRANSPORT;
+addr->message = string_sprintf("transport \"%s\" not found in %s router", ss,
+ router_name);
+return FALSE;
+}
+
+/* End of rf_get_transport.c */