| 1 | /************************************************* |
| 2 | * Exim - an Internet mail transport agent * |
| 3 | *************************************************/ |
| 4 | |
| 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
| 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 additional headers for a router * |
| 14 | *************************************************/ |
| 15 | |
| 16 | /* This function is called by routers to sort out the additional headers |
| 17 | and header remove list for a particular address. |
| 18 | |
| 19 | Arguments: |
| 20 | addr the input address |
| 21 | rblock the router instance |
| 22 | extra_headers points to where to hang the header chain |
| 23 | remove_headers points to where to hang the remove list |
| 24 | |
| 25 | Returns: OK if no problem |
| 26 | DEFER if expanding a string caused a deferment |
| 27 | or a big disaster (e.g. expansion failure) |
| 28 | */ |
| 29 | |
| 30 | int |
| 31 | rf_get_munge_headers(address_item *addr, router_instance *rblock, |
| 32 | header_line **extra_headers, uschar **remove_headers) |
| 33 | { |
| 34 | /* Default is to retain existing headers */ |
| 35 | *extra_headers = addr->prop.extra_headers; |
| 36 | |
| 37 | if (rblock->extra_headers) |
| 38 | { |
| 39 | const uschar * list = rblock->extra_headers; |
| 40 | int sep = '\n'; |
| 41 | uschar * s; |
| 42 | int slen; |
| 43 | |
| 44 | while ((s = string_nextinlist(&list, &sep, NULL, 0))) |
| 45 | if (!(s = expand_string(s))) |
| 46 | { |
| 47 | if (!expand_string_forcedfail) |
| 48 | { |
| 49 | addr->message = string_sprintf("%s router failed to expand \"%s\": %s", |
| 50 | rblock->name, rblock->extra_headers, expand_string_message); |
| 51 | return DEFER; |
| 52 | } |
| 53 | } |
| 54 | else if ((slen = Ustrlen(s)) > 0) |
| 55 | { |
| 56 | /* Expand succeeded. Put extra headers at the start of the chain because |
| 57 | further down it may point to headers from other routers, which may be |
| 58 | shared with other addresses. The output function outputs them in reverse |
| 59 | order. */ |
| 60 | |
| 61 | header_line * h = store_get(sizeof(header_line)); |
| 62 | |
| 63 | /* We used to use string_sprintf() to add the newline if needed, but that |
| 64 | causes problems if the header line is exceedingly long (e.g. adding |
| 65 | something to a pathologically long line). So avoid it. */ |
| 66 | |
| 67 | if (s[slen-1] == '\n') |
| 68 | h->text = s; |
| 69 | else |
| 70 | { |
| 71 | h->text = store_get(slen+2); |
| 72 | memcpy(h->text, s, slen); |
| 73 | h->text[slen++] = '\n'; |
| 74 | h->text[slen] = 0; |
| 75 | } |
| 76 | |
| 77 | h->next = *extra_headers; |
| 78 | h->type = htype_other; |
| 79 | h->slen = slen; |
| 80 | *extra_headers = h; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /* Default is to retain existing removes */ |
| 85 | *remove_headers = addr->prop.remove_headers; |
| 86 | |
| 87 | /* Expand items from colon-sep list separately, then build new list */ |
| 88 | if (rblock->remove_headers) |
| 89 | { |
| 90 | const uschar * list = rblock->remove_headers; |
| 91 | int sep = ':'; |
| 92 | uschar * s; |
| 93 | |
| 94 | while ((s = string_nextinlist(&list, &sep, NULL, 0))) |
| 95 | if (!(s = expand_string(s))) |
| 96 | { |
| 97 | if (!expand_string_forcedfail) |
| 98 | { |
| 99 | addr->message = string_sprintf("%s router failed to expand \"%s\": %s", |
| 100 | rblock->name, rblock->remove_headers, expand_string_message); |
| 101 | return DEFER; |
| 102 | } |
| 103 | } |
| 104 | else if (*s) |
| 105 | *remove_headers = string_append_listele(*remove_headers, ':', s); |
| 106 | } |
| 107 | |
| 108 | return OK; |
| 109 | } |
| 110 | |
| 111 | /* End of rf_get_munge_headers.c */ |