| 1 | /* $Cambridge: exim/src/src/routers/rf_get_munge_headers.c,v 1.5 2009/11/16 19:50:38 nm4 Exp $ */ |
| 2 | |
| 3 | /************************************************* |
| 4 | * Exim - an Internet mail transport agent * |
| 5 | *************************************************/ |
| 6 | |
| 7 | /* Copyright (c) University of Cambridge 1995 - 2009 */ |
| 8 | /* See the file NOTICE for conditions of use and distribution. */ |
| 9 | |
| 10 | #include "../exim.h" |
| 11 | #include "rf_functions.h" |
| 12 | |
| 13 | |
| 14 | /************************************************* |
| 15 | * Get additional headers for a router * |
| 16 | *************************************************/ |
| 17 | |
| 18 | /* This function is called by both routers to sort out the additional headers |
| 19 | and header remove list for a particular address. |
| 20 | |
| 21 | Arguments: |
| 22 | addr the input address |
| 23 | rblock the router instance |
| 24 | extra_headers points to where to hang the header chain |
| 25 | remove_headers points to where to hang the remove list |
| 26 | |
| 27 | Returns: OK if no problem |
| 28 | DEFER if expanding a string caused a deferment |
| 29 | or a big disaster (e.g. expansion failure) |
| 30 | */ |
| 31 | |
| 32 | int |
| 33 | rf_get_munge_headers(address_item *addr, router_instance *rblock, |
| 34 | header_line **extra_headers, uschar **remove_headers) |
| 35 | { |
| 36 | /* Default is to retain existing headers */ |
| 37 | |
| 38 | *extra_headers = addr->p.extra_headers; |
| 39 | |
| 40 | if (rblock->extra_headers != NULL) |
| 41 | { |
| 42 | header_line *h; |
| 43 | uschar *s = expand_string(rblock->extra_headers); |
| 44 | |
| 45 | if (s == NULL) |
| 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 | |
| 55 | /* Expand succeeded. Put extra header at the start of the chain because |
| 56 | further down it may point to headers from other routers, which may be |
| 57 | shared with other addresses. The output function outputs them in reverse |
| 58 | order. */ |
| 59 | |
| 60 | else |
| 61 | { |
| 62 | int slen = Ustrlen(s); |
| 63 | if (slen > 0) |
| 64 | { |
| 65 | h = store_get(sizeof(header_line)); |
| 66 | |
| 67 | /* We used to use string_sprintf() to add the newline if needed, but that |
| 68 | causes problems if the header line is exceedingly long (e.g. adding |
| 69 | something to a pathologically long line). So avoid it. */ |
| 70 | |
| 71 | if (s[slen-1] == '\n') |
| 72 | { |
| 73 | h->text = s; |
| 74 | } |
| 75 | else |
| 76 | { |
| 77 | h->text = store_get(slen+2); |
| 78 | memcpy(h->text, s, slen); |
| 79 | h->text[slen++] = '\n'; |
| 80 | h->text[slen] = 0; |
| 81 | } |
| 82 | |
| 83 | h->next = addr->p.extra_headers; |
| 84 | h->type = htype_other; |
| 85 | h->slen = slen; |
| 86 | *extra_headers = h; |
| 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | /* Default is to retain existing removes */ |
| 92 | |
| 93 | *remove_headers = addr->p.remove_headers; |
| 94 | |
| 95 | if (rblock->remove_headers != NULL) |
| 96 | { |
| 97 | uschar *s = expand_string(rblock->remove_headers); |
| 98 | if (s == NULL) |
| 99 | { |
| 100 | if (!expand_string_forcedfail) |
| 101 | { |
| 102 | addr->message = string_sprintf("%s router failed to expand \"%s\": %s", |
| 103 | rblock->name, rblock->remove_headers, expand_string_message); |
| 104 | return DEFER; |
| 105 | } |
| 106 | } |
| 107 | else if (*s != 0) |
| 108 | { |
| 109 | if (addr->p.remove_headers == NULL) |
| 110 | *remove_headers = s; |
| 111 | else |
| 112 | *remove_headers = string_sprintf("%s : %s", addr->p.remove_headers, s); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | return OK; |
| 117 | } |
| 118 | |
| 119 | /* End of rf_get_munge_headers.c */ |