src/src/routers/rf_get_transport.c

   1 /*************************************************
   2 *     Exim - an Internet mail transport agent    *
   3 *************************************************/
   4
   5 /* Copyright (c) University of Cambridge 1995 - 2009 */
   6 /* See the file NOTICE for conditions of use and distribution. */
   7
   8 #include "../exim.h"
   9 #include "rf_functions.h"
  10
  11
  12 /*************************************************
  13 *       Get transport for a router               *
  14 *************************************************/
  15
  16 /* If transport_name contains $, it must be expanded each time and used as a
  17 transport name. Otherwise, look up the transport only if the destination is not
  18 already set.
  19
  20 Some routers (e.g. accept) insist that their transport option is set at
  21 initialization time. However, for some (e.g. file_transport in redirect), there
  22 is no such check, because the transport may not be required. Calls to this
  23 function from the former type of router have require_name = NULL, because it
  24 will never be used. NULL is also used in verify_only cases, where a transport
  25 is not required.
  26
  27 Arguments:
  28   tpname        the text of the transport name
  29   tpptr         where to put the transport
  30   addr          the address being processed
  31   router_name   for error messages
  32   require_name  used in the error message if transport is unset
  33
  34 Returns:        TRUE if *tpptr is already set and tpname has no '$' in it;
  35                 TRUE if a transport has been placed in tpptr;
  36                 FALSE if there's a problem, in which case
  37                 addr->message contains a message, and addr->basic_errno has
  38                 ERRNO_BADTRANSPORT set in it.
  39 */
  40
  41 BOOL
  42 rf_get_transport(uschar *tpname, transport_instance **tpptr, address_item *addr,
  43   uschar *router_name, uschar *require_name)
  44 {
  45 uschar *ss;
  46 BOOL expandable;
  47
  48 if (tpname == NULL)
  49   {
  50   if (require_name == NULL) return TRUE;
  51   addr->basic_errno = ERRNO_BADTRANSPORT;
  52   addr->message = string_sprintf("%s unset in %s router", require_name,
  53     router_name);
  54   return FALSE;
  55   }
  56
  57 expandable = Ustrchr(tpname, '$') != NULL;
  58 if (*tpptr != NULL && !expandable) return TRUE;
  59
  60 if (expandable)
  61   {
  62   ss = expand_string(tpname);
  63   if (ss == NULL)
  64     {
  65     addr->basic_errno = ERRNO_BADTRANSPORT;
  66     addr->message = string_sprintf("failed to expand transport "
  67       "\"%s\" in %s router: %s", tpname, router_name, expand_string_message);
  68     return FALSE;
  69     }
  70   }
  71 else ss = tpname;
  72
  73 for (transport_instance * tp = transports; tp; tp = tp->next)
  74   if (Ustrcmp(tp->name, ss) == 0)
  75     {
  76     DEBUG(D_route) debug_printf("set transport %s\n", ss);
  77     *tpptr = tp;
  78     return TRUE;
  79     }
  80
  81 addr->basic_errno = ERRNO_BADTRANSPORT;
  82 addr->message = string_sprintf("transport \"%s\" not found in %s router", ss,
  83   router_name);
  84 return FALSE;
  85 }
  86
  87 /* End of rf_get_transport.c */