src/src/routers/rf_get_errors_address.c

   1 /* $Cambridge: exim/src/src/routers/rf_get_errors_address.c,v 1.6 2006/02/07 11:19:02 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   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       v_none / v_recipient / v_sender / v_expn
  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   int 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 != v_none)
  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   /* NOTE: the address is verified as a recipient, not a sender. This is
 104   perhaps confusing. It isn't immediately obvious what to do: we want to have
 105   some confidence that we can deliver to the address, in which case it will be
 106   a recipient, but on the other hand, it will be passed on in SMTP deliveries
 107   as a sender. However, I think on balance recipient is right because sender
 108   verification is really about the *incoming* sender of the message.
 109
 110   If this code is changed, note that you must set vopt_fake_sender instead of
 111   vopt_is_recipient, as otherwise sender_address may be altered because
 112   verify_address() thinks it is dealing with *the* sender of the message. */
 113
 114   DEBUG(D_route|D_verify)
 115     debug_printf("------ Verifying errors address %s ------\n", s);
 116   if (verify_address(snew, NULL,
 117       vopt_is_recipient /* vopt_fake_sender is the alternative */
 118       | vopt_qualify, -1, -1, -1, NULL, NULL, NULL) == OK)
 119     *errors_to = snew->address;
 120   DEBUG(D_route|D_verify)
 121     debug_printf("------ End verifying errors address %s ------\n", s);
 122
 123   address_test_mode = save_address_test_mode;
 124   for (i = 0, p = address_expansions; *p != NULL;)
 125     **p++ = address_expansions_save[i++];
 126
 127   if (sender_address != NULL) sender_address[0] = save1;
 128   }
 129
 130 return OK;
 131 }
 132
 133 /* End of rf_get_errors_address.c */