src/src/routers/rf_get_errors_address.c

   1 /* $Cambridge: exim/src/src/routers/rf_get_errors_address.c,v 1.3 2005/01/04 10:00:44 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2005 */
   8 /* See the file NOTICE for conditions of use and distribution. */
   9
  10 #include "../exim.h"
  11 #include "rf_functions.h"
  12
  13
  14 /*************************************************
  15 *        Get errors address for a router         *
  16 *************************************************/
  17
  18 /* This function is called by routers to sort out the errors address for a
  19 particular address. If there is a setting in the router block, then expand and
  20 verify it, and if it works, use it. Otherwise use any setting that is in the
  21 address itself. This might be NULL, meaning unset (the message's sender is then
  22 used). Verification isn't done when the original address is just being
  23 verified, as otherwise there might be routing loops if someone sets up a silly
  24 configuration.
  25
  26 Arguments:
  27   addr         the input address
  28   rblock       the router instance
  29   verify       TRUE when verifying
  30   errors_to    point the errors address here
  31
  32 Returns:       OK if no problem
  33                DEFER if verifying the address caused a deferment
  34                  or a big disaster (e.g. expansion failure)
  35 */
  36
  37 int
  38 rf_get_errors_address(address_item *addr, router_instance *rblock,
  39   BOOL verify, uschar **errors_to)
  40 {
  41 uschar *s;
  42
  43 *errors_to = addr->p.errors_address;
  44 if (rblock->errors_to == NULL) return OK;
  45
  46 s = expand_string(rblock->errors_to);
  47
  48 if (s == NULL)
  49   {
  50   if (expand_string_forcedfail)
  51     {
  52     DEBUG(D_route)
  53       debug_printf("forced expansion failure - ignoring errors_to\n");
  54     return OK;
  55     }
  56   addr->message = string_sprintf("%s router failed to expand \"%s\": %s",
  57     rblock->name, rblock->errors_to, expand_string_message);
  58   return DEFER;
  59   }
  60
  61 /* If the errors_to address is empty, it means "ignore errors" */
  62
  63 if (*s == 0)
  64   {
  65   setflag(addr, af_ignore_error);      /* For locally detected errors */
  66   *errors_to = US"";                   /* Return path for SMTP */
  67   return OK;
  68   }
  69
  70 /* If we are already verifying, do not check the errors address, in order to
  71 save effort (but we do verify when testing an address). When we do verify, set
  72 the sender address to null, because that's what it will be when sending an
  73 error message, and there are now configuration options that control the running
  74 of routers by checking the sender address. When testing an address, there may
  75 not be a sender address. We also need to save and restore the expansion values
  76 associated with an address. */
  77
  78 if (verify)
  79   {
  80   *errors_to = s;
  81   DEBUG(D_route)
  82     debug_printf("skipped verify errors_to address: already verifying\n");
  83   }
  84 else
  85   {
  86   BOOL save_address_test_mode = address_test_mode;
  87   int save1 = 0;
  88   int i;
  89   uschar ***p;
  90   uschar *address_expansions_save[ADDRESS_EXPANSIONS_COUNT];
  91   address_item *snew = deliver_make_addr(s, FALSE);
  92
  93   if (sender_address != NULL)
  94     {
  95     save1 = sender_address[0];
  96     sender_address[0] = 0;
  97     }
  98
  99   for (i = 0, p = address_expansions; *p != NULL;)
 100     address_expansions_save[i++] = **p++;
 101   address_test_mode = FALSE;
 102
 103   DEBUG(D_route|D_verify)
 104     debug_printf("------ Verifying errors address %s ------\n", s);
 105   if (verify_address(snew, NULL, vopt_is_recipient | vopt_qualify, -1, -1, -1,
 106     NULL, NULL, NULL) == OK) *errors_to = snew->address;
 107   DEBUG(D_route|D_verify)
 108     debug_printf("------ End verifying errors address %s ------\n", s);
 109
 110   address_test_mode = save_address_test_mode;
 111   for (i = 0, p = address_expansions; *p != NULL;)
 112     **p++ = address_expansions_save[i++];
 113
 114   if (sender_address != NULL) sender_address[0] = save1;
 115   }
 116
 117 return OK;
 118 }
 119
 120 /* End of rf_get_errors_address.c */