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0756eb3c PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
0756eb3c PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | #include "../exim.h" | |
9 | #include "rf_functions.h" | |
10 | ||
11 | ||
12 | /************************************************* | |
13 | * Get errors address for a router * | |
14 | *************************************************/ | |
15 | ||
16 | /* This function is called by routers to sort out the errors address for a | |
17 | particular address. If there is a setting in the router block, then expand and | |
18 | verify it, and if it works, use it. Otherwise use any setting that is in the | |
19 | address itself. This might be NULL, meaning unset (the message's sender is then | |
20 | used). Verification isn't done when the original address is just being | |
21 | verified, as otherwise there might be routing loops if someone sets up a silly | |
22 | configuration. | |
23 | ||
24 | Arguments: | |
25 | addr the input address | |
26 | rblock the router instance | |
fd6de02e | 27 | verify v_none / v_recipient / v_sender / v_expn |
0756eb3c PH |
28 | errors_to point the errors address here |
29 | ||
30 | Returns: OK if no problem | |
31 | DEFER if verifying the address caused a deferment | |
32 | or a big disaster (e.g. expansion failure) | |
33 | */ | |
34 | ||
35 | int | |
36 | rf_get_errors_address(address_item *addr, router_instance *rblock, | |
fd6de02e | 37 | int verify, uschar **errors_to) |
0756eb3c PH |
38 | { |
39 | uschar *s; | |
40 | ||
d43cbe25 | 41 | *errors_to = addr->prop.errors_address; |
0756eb3c PH |
42 | if (rblock->errors_to == NULL) return OK; |
43 | ||
44 | s = expand_string(rblock->errors_to); | |
45 | ||
46 | if (s == NULL) | |
47 | { | |
48 | if (expand_string_forcedfail) | |
49 | { | |
50 | DEBUG(D_route) | |
51 | debug_printf("forced expansion failure - ignoring errors_to\n"); | |
52 | return OK; | |
53 | } | |
54 | addr->message = string_sprintf("%s router failed to expand \"%s\": %s", | |
55 | rblock->name, rblock->errors_to, expand_string_message); | |
56 | return DEFER; | |
57 | } | |
58 | ||
59 | /* If the errors_to address is empty, it means "ignore errors" */ | |
60 | ||
61 | if (*s == 0) | |
62 | { | |
7eb0e5d2 | 63 | addr->prop.ignore_error = TRUE; /* For locally detected errors */ |
0756eb3c PH |
64 | *errors_to = US""; /* Return path for SMTP */ |
65 | return OK; | |
66 | } | |
67 | ||
68 | /* If we are already verifying, do not check the errors address, in order to | |
69 | save effort (but we do verify when testing an address). When we do verify, set | |
70 | the sender address to null, because that's what it will be when sending an | |
71 | error message, and there are now configuration options that control the running | |
72 | of routers by checking the sender address. When testing an address, there may | |
73 | not be a sender address. We also need to save and restore the expansion values | |
74 | associated with an address. */ | |
75 | ||
fd6de02e | 76 | if (verify != v_none) |
0756eb3c PH |
77 | { |
78 | *errors_to = s; | |
79 | DEBUG(D_route) | |
80 | debug_printf("skipped verify errors_to address: already verifying\n"); | |
81 | } | |
82 | else | |
83 | { | |
84 | BOOL save_address_test_mode = address_test_mode; | |
85 | int save1 = 0; | |
86 | int i; | |
55414b25 JH |
87 | const uschar ***p; |
88 | const uschar *address_expansions_save[ADDRESS_EXPANSIONS_COUNT]; | |
0756eb3c PH |
89 | address_item *snew = deliver_make_addr(s, FALSE); |
90 | ||
91 | if (sender_address != NULL) | |
92 | { | |
93 | save1 = sender_address[0]; | |
94 | sender_address[0] = 0; | |
95 | } | |
96 | ||
97 | for (i = 0, p = address_expansions; *p != NULL;) | |
98 | address_expansions_save[i++] = **p++; | |
99 | address_test_mode = FALSE; | |
100 | ||
58de37c5 PH |
101 | /* NOTE: the address is verified as a recipient, not a sender. This is |
102 | perhaps confusing. It isn't immediately obvious what to do: we want to have | |
103 | some confidence that we can deliver to the address, in which case it will be | |
104 | a recipient, but on the other hand, it will be passed on in SMTP deliveries | |
105 | as a sender. However, I think on balance recipient is right because sender | |
106 | verification is really about the *incoming* sender of the message. | |
107 | ||
108 | If this code is changed, note that you must set vopt_fake_sender instead of | |
109 | vopt_is_recipient, as otherwise sender_address may be altered because | |
110 | verify_address() thinks it is dealing with *the* sender of the message. */ | |
111 | ||
0756eb3c PH |
112 | DEBUG(D_route|D_verify) |
113 | debug_printf("------ Verifying errors address %s ------\n", s); | |
58de37c5 PH |
114 | if (verify_address(snew, NULL, |
115 | vopt_is_recipient /* vopt_fake_sender is the alternative */ | |
116 | | vopt_qualify, -1, -1, -1, NULL, NULL, NULL) == OK) | |
117 | *errors_to = snew->address; | |
0756eb3c PH |
118 | DEBUG(D_route|D_verify) |
119 | debug_printf("------ End verifying errors address %s ------\n", s); | |
120 | ||
121 | address_test_mode = save_address_test_mode; | |
122 | for (i = 0, p = address_expansions; *p != NULL;) | |
123 | **p++ = address_expansions_save[i++]; | |
124 | ||
125 | if (sender_address != NULL) sender_address[0] = save1; | |
126 | } | |
127 | ||
128 | return OK; | |
129 | } | |
130 | ||
131 | /* End of rf_get_errors_address.c */ |