1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2023 */
6 /* Copyright (c) University of Cambridge 1995 - 2009 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
12 #include "rf_functions.h"
16 /*************************************************
17 * Decode actions for self reference *
18 *************************************************/
20 /* This function is called from a number of routers on receiving
21 HOST_FOUND_LOCAL when looking up a supposedly remote host. The action is
22 controlled by a generic configuration option called "self" on each router,
25 . freeze: Log the incident, freeze, and return DEFER
27 . defer: Log the incident and return DEFER
29 . fail: Fail the address
31 . send: Carry on with the delivery regardless -
32 this makes sense only if the SMTP
33 listener on this machine is a differently
36 . pass: The router passes; the address
37 gets passed to the next router, overriding
38 the setting of no_more
40 . reroute:<new-domain> Change the domain to the given domain
41 and return REROUTE so it gets passed back
44 . reroute:rewrite:<new-domain> The same, but headers containing the
45 old domain get rewritten.
47 These string values are interpreted earlier on, and passed into this function
48 as the values of "code" and "rewrite".
51 addr the address being routed
52 host the host that is local, with MX set (or -1 if MX not used)
53 code the action to be taken (one of the self_xxx enums)
54 rewrite TRUE if rewriting headers required for REROUTED
55 new new domain to be used for REROUTED
56 addr_new child chain for REROUTEED
58 Returns: DEFER, REROUTED, PASS, FAIL, or OK, according to the value of code.
62 rf_self_action(address_item *addr, host_item *host, int code, BOOL rewrite,
63 uschar *new, address_item **addr_new)
65 uschar * msg = host->mx >= 0
66 ? US"lowest numbered MX record points to local host"
67 : US"remote host address is the local host";
73 /* If there is no message id, this is happening during an address
74 verification, so give information about the address that is being verified,
75 and where it has come from. Otherwise, during message delivery, the normal
76 logging for the address will be sufficient. */
80 log_write(0, LOG_MAIN, "%s: %s (while verifying <%s> from host %s)",
81 msg, addr->domain, addr->address, sender_fullhost);
83 log_write(0, LOG_MAIN, "%s: %s (while routing <%s>)", msg,
84 addr->domain, addr->address);
86 log_write(0, LOG_MAIN, "%s: %s", msg, addr->domain);
89 addr->special_action = SPECIAL_FREEZE;
98 debug_printf("%s: %s: domain changed to %s\n", msg, addr->domain, new);
99 rf_change_domain(addr, new, rewrite, addr_new);
104 debug_printf("%s: %s: configured to try delivery anyway\n", msg, addr->domain);
107 case self_pass: /* This is soft failure; pass to next router */
109 debug_printf("%s: %s: passed to next router (self = pass)\n", msg, addr->domain);
111 addr->self_hostname = string_copy(host->name);
116 debug_printf("%s: %s: address failed (self = fail)\n", msg, addr->domain);
118 setflag(addr, af_pass_message);
122 return DEFER; /* paranoia */
125 /* End of rf_self_action.c */