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/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
/* Copyright (c) The Exim Maintainers 2021 - 2022 */
/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
#include "../exim.h"
#include "rf_functions.h"
/*************************************************
* Get additional headers for a router *
*************************************************/
/* This function is called by routers to sort out the additional headers
and header remove list for a particular address.
Arguments:
addr the input address
rblock the router instance
extra_headers points to where to hang the header chain
remove_headers points to where to hang the remove list
Returns: OK if no problem
DEFER if expanding a string caused a deferment
or a big disaster (e.g. expansion failure)
*/
int
rf_get_munge_headers(address_item *addr, router_instance *rblock,
header_line **extra_headers, uschar **remove_headers)
{
/* Default is to retain existing headers */
*extra_headers = addr->prop.extra_headers;
if (rblock->extra_headers)
{
const uschar * list = rblock->extra_headers;
int sep = '\n';
uschar * s, * t;
int slen;
while ((s = string_nextinlist(&list, &sep, NULL, 0)))
if (!(s = expand_string(t = s)))
{
if (!f.expand_string_forcedfail)
{
addr->message = string_sprintf(
"%s router failed to expand add_headers item \"%s\": %s",
rblock->name, t, expand_string_message);
return DEFER;
}
}
else if ((slen = Ustrlen(s)) > 0)
{
/* Expand succeeded. Put extra headers at the start of the chain because
further down it may point to headers from other routers, which may be
shared with other addresses. The output function outputs them in reverse
order. */
header_line * h = store_get(sizeof(header_line), GET_UNTAINTED);
/* We used to use string_sprintf() to add the newline if needed, but that
causes problems if the header line is exceedingly long (e.g. adding
something to a pathologically long line). So avoid it. */
if (s[slen-1] == '\n')
h->text = s;
else
{
h->text = store_get(slen+2, s);
memcpy(h->text, s, slen);
h->text[slen++] = '\n';
h->text[slen] = 0;
}
h->next = *extra_headers;
h->type = htype_other;
h->slen = slen;
*extra_headers = h;
}
}
/* Default is to retain existing removes */
*remove_headers = addr->prop.remove_headers;
/* Expand items from colon-sep list separately, then build new list */
if (rblock->remove_headers)
{
const uschar * list = rblock->remove_headers;
int sep = ':';
uschar * s, * t;
gstring * g = NULL;
if (*remove_headers)
g = string_cat(NULL, *remove_headers);
while ((s = string_nextinlist(&list, &sep, NULL, 0)))
if (!(s = expand_string(t = s)))
{
if (!f.expand_string_forcedfail)
{
addr->message = string_sprintf(
"%s router failed to expand remove_headers item \"%s\": %s",
rblock->name, t, expand_string_message);
return DEFER;
}
}
else if (*s)
g = string_append_listele(g, ':', s);
if (g)
*remove_headers = g->s;
}
return OK;
}
/* vi: aw ai sw=2
*/
/* End of rf_get_munge_headers.c */
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