src/src/routers/rf_get_munge_headers.c

   1 /* $Cambridge: exim/src/src/routers/rf_get_munge_headers.c,v 1.3 2006/02/07 11:19:02 ph10 Exp $ */
   2
   3 /*************************************************
   4 *     Exim - an Internet mail transport agent    *
   5 *************************************************/
   6
   7 /* Copyright (c) University of Cambridge 1995 - 2006 */
   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 */