src/routers/rf_self_action.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
   9 #include "../exim.h"
  10 #include "rf_functions.h"
  11
  12
  13
  14 /*************************************************
  15 *        Decode actions for self reference       *
  16 *************************************************/
  17
  18 /* This function is called from a number of routers on receiving
  19 HOST_FOUND_LOCAL when looking up a supposedly remote host. The action is
  20 controlled by a generic configuration option called "self" on each router,
  21 which can be one of:
  22
  23    . freeze:                       Log the incident, freeze, and return DEFER
  24
  25    . defer:                        Log the incident and return DEFER
  26
  27    . fail:                         Fail the address
  28
  29    . send:                         Carry on with the delivery regardless -
  30                                    this makes sense only if the SMTP
  31                                    listener on this machine is a differently
  32                                    configured MTA
  33
  34    . pass:                         The router passes; the address
  35                                    gets passed to the next router, overriding
  36                                    the setting of no_more
  37
  38    . reroute:<new-domain>          Change the domain to the given domain
  39                                    and return REROUTE so it gets passed back
  40                                    to the routers.
  41
  42    . reroute:rewrite:<new-domain>  The same, but headers containing the
  43                                    old domain get rewritten.
  44
  45 These string values are interpreted earlier on, and passed into this function
  46 as the values of "code" and "rewrite".
  47
  48 Arguments:
  49   addr       the address being routed
  50   host       the host that is local, with MX set (or -1 if MX not used)
  51   code       the action to be taken (one of the self_xxx enums)
  52   rewrite    TRUE if rewriting headers required for REROUTED
  53   new        new domain to be used for REROUTED
  54   addr_new   child chain for REROUTEED
  55
  56 Returns:   DEFER, REROUTED, PASS, FAIL, or OK, according to the value of code.
  57 */
  58
  59 int
  60 rf_self_action(address_item *addr, host_item *host, int code, BOOL rewrite,
  61   uschar *new, address_item **addr_new)
  62 {
  63 uschar * msg = host->mx >= 0
  64   ? US"lowest numbered MX record points to local host"
  65   : US"remote host address is the local host";
  66
  67 switch (code)
  68   {
  69   case self_freeze:
  70
  71     /* If there is no message id, this is happening during an address
  72     verification, so give information about the address that is being verified,
  73     and where it has come from. Otherwise, during message delivery, the normal
  74     logging for the address will be sufficient. */
  75
  76     if (message_id[0] == 0)
  77       if (sender_fullhost)
  78         log_write(0, LOG_MAIN, "%s: %s (while verifying <%s> from host %s)",
  79           msg, addr->domain, addr->address, sender_fullhost);
  80       else
  81         log_write(0, LOG_MAIN, "%s: %s (while routing <%s>)", msg,
  82           addr->domain, addr->address);
  83     else
  84       log_write(0, LOG_MAIN, "%s: %s", msg, addr->domain);
  85
  86     addr->message = msg;
  87     addr->special_action = SPECIAL_FREEZE;
  88     return DEFER;
  89
  90   case self_defer:
  91     addr->message = msg;
  92     return DEFER;
  93
  94   case self_reroute:
  95     DEBUG(D_route)
  96       debug_printf("%s: %s: domain changed to %s\n", msg, addr->domain, new);
  97     rf_change_domain(addr, new, rewrite, addr_new);
  98     return REROUTED;
  99
 100   case self_send:
 101     DEBUG(D_route)
 102       debug_printf("%s: %s: configured to try delivery anyway\n", msg, addr->domain);
 103     return OK;
 104
 105   case self_pass:    /* This is soft failure; pass to next router */
 106     DEBUG(D_route)
 107       debug_printf("%s: %s: passed to next router (self = pass)\n", msg, addr->domain);
 108     addr->message = msg;
 109     addr->self_hostname = string_copy(host->name);
 110     return PASS;
 111
 112   case self_fail:
 113     DEBUG(D_route)
 114       debug_printf("%s: %s: address failed (self = fail)\n", msg, addr->domain);
 115     addr->message = msg;
 116     setflag(addr, af_pass_message);
 117     return FAIL;
 118   }
 119
 120 return DEFER;   /* paranoia */
 121 }
 122
 123 /* End of rf_self_action.c */