On 23/05/2023 21:01, Julian Bradfield via Exim-users wrote:
> On 2023-05-23, Julian Bradfield via Exim-users <exim-users@???> wrote:
>> So it's very unobvious what the "explicit coding" might be.
>
> Just having a quick look at the source code, what does line 415 of
> dnslookup.c (in git master) do, since ob->rewrite_headers is true?
As you found, I assume, ob->rewrite_headers comes from the
router configuration, option "rewrite_headers", which defaults
to true.
The block comment on that function says:
/* When a router wants to change the address that is being routed, it is like a
redirection. We insert a new parent of the current address to hold the original
information, and change the data in the original address, which is now the
child. The child address is put onto the addr_new chain. Pick up the local part
from the "address" field so as to get it in external form - caseful, and with
any quoting retained.
Arguments:
addr the address block
domain the new domain
rewrite TRUE if headers lines are to be rewritten
addr_new the new address chain
The porting using the "rewrite" arg goes:
/* Rewrite header lines if requested */
if (rewrite)
{
DEBUG(D_route|D_rewrite) debug_printf("rewriting header lines\n");
for (header_line * h = header_list; h != NULL; h = h->next)
{
header_line *newh =
rewrite_header(h, parent->domain, domain,
global_rewrite_rules, rewrite_existflags, TRUE);
The "global_rewrite_rules" are (a list) developed from reading the
configuration. See
https://exim.org/exim-html-current/doc/html/spec_html/ch-address_rewriting.html
In summary, if the router option value is true then the global rewrite
rules are applied to the result of the DNS lookup done by the dnslookup
router.
--
Cheers,
Jeremy
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