1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2024 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
11 #include "rf_functions.h"
14 /*************************************************
15 * Get errors address for a router *
16 *************************************************/
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
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
32 Returns: OK if no problem
33 DEFER if verifying the address caused a deferment
34 or a big disaster (e.g. expansion failure)
38 rf_get_errors_address(address_item * addr, router_instance * rblock,
39 int verify, const uschar ** errors_to)
43 *errors_to = addr->prop.errors_address;
44 if (!rblock->errors_to) return OK;
46 GET_OPTION("errors_to");
47 if (!(s = expand_string(rblock->errors_to)))
49 if (f.expand_string_forcedfail)
52 debug_printf("forced expansion failure - ignoring errors_to\n");
55 addr->message = string_sprintf("%s router failed to expand \"%s\": %s",
56 rblock->drinst.name, rblock->errors_to, expand_string_message);
60 /* If the errors_to address is empty, it means "ignore errors" */
64 addr->prop.ignore_error = TRUE; /* For locally detected errors */
65 *errors_to = US""; /* Return path for SMTP */
69 /* If we are already verifying, do not check the errors address, in order to
70 save effort (but we do verify when testing an address). When we do verify, set
71 the sender address to null, because that's what it will be when sending an
72 error message, and there are now configuration options that control the running
73 of routers by checking the sender address. When testing an address, there may
74 not be a sender address. We also need to save and restore the expansion values
75 associated with an address. */
81 debug_printf("skipped verify errors_to address: already verifying\n");
85 BOOL save_address_test_mode = f.address_test_mode;
86 const uschar * save_sender = sender_address;
89 const uschar *address_expansions_save[ADDRESS_EXPANSIONS_COUNT];
90 address_item *snew = deliver_make_addr(s, FALSE);
93 sender_address = US"";
95 for (i = 0, p = address_expansions; *p;)
96 address_expansions_save[i++] = **p++;
97 f.address_test_mode = FALSE;
99 /* NOTE: the address is verified as a recipient, not a sender. This is
100 perhaps confusing. It isn't immediately obvious what to do: we want to have
101 some confidence that we can deliver to the address, in which case it will be
102 a recipient, but on the other hand, it will be passed on in SMTP deliveries
103 as a sender. However, I think on balance recipient is right because sender
104 verification is really about the *incoming* sender of the message.
106 If this code is changed, note that you must set vopt_fake_sender instead of
107 vopt_is_recipient, as otherwise sender_address may be altered because
108 verify_address() thinks it is dealing with *the* sender of the message. */
110 DEBUG(D_route|D_verify)
111 debug_printf("------ Verifying errors address %s ------\n", s);
112 if (verify_address(snew, NULL,
113 vopt_is_recipient /* vopt_fake_sender is the alternative */
114 | vopt_qualify, -1, -1, -1, NULL, NULL, NULL) == OK)
115 *errors_to = snew->address;
116 DEBUG(D_route|D_verify)
117 debug_printf("------ End verifying errors address %s ------\n", s);
119 f.address_test_mode = save_address_test_mode;
120 for (i = 0, p = address_expansions; *p; )
121 **p++ = address_expansions_save[i++];
123 sender_address = save_sender;
129 /* End of rf_get_errors_address.c */