-/* $Cambridge: exim/src/src/routers/rf_lookup_hostlist.c,v 1.10 2007/03/14 11:22:23 ph10 Exp $ */
-
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2007 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* Copyright (c) The Exim Maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
rblock the router block
addr the address being routed
ignore_target_hosts list of hosts to ignore
- lookup_type lk_default or lk_byname or lk_bydns
+ lookup_type LK_DEFAULT or LK_BYNAME or LK_BYDNS,
+ plus LK_IPV4_{ONLY,PREFER}
hff_code what to do for host find failed
addr_new passed to rf_self_action for self=reroute
address_item **addr_new)
{
BOOL self_send = FALSE;
-host_item *h, *next_h, *prev;
/* Look up each host address. A lookup may add additional items into the chain
if there are multiple addresses. Hence the use of next_h to start each cycle of
list of MX hosts. If the first host is the local host, act according to the
"self" option in the configuration. */
-prev = NULL;
-for (h = addr->host_list; h != NULL; h = next_h)
+for (host_item * prev = NULL, * h = addr->host_list, *next_h; h; h = next_h)
{
- uschar *canonical_name;
- int rc, len, port;
+ const uschar *canonical_name;
+ int rc, len, port, mx, sort_key;
next_h = h->next;
- if (h->address != NULL) { prev = h; continue; }
+ if (h->address) { prev = h; continue; }
DEBUG(D_route|D_host_lookup)
debug_printf("finding IP address for %s\n", h->name);
port = host_item_get_port(h);
+ /* Store the previous mx and sort_key values, which were assigned in
+ host_build_hostlist and will be overwritten by host_find_bydns. */
+
+ mx = h->mx;
+ sort_key = h->sort_key;
+
/* If the name ends with "/MX", we interpret it to mean "the list of hosts
- pointed to by MX records with this name". */
+ pointed to by MX records with this name", and the MX record values override
+ the ordering from host_build_hostlist. */
len = Ustrlen(h->name);
if (len > 3 && strcmpic(h->name + len - 3, US"/mx") == 0)
{
+ int whichrrs = lookup_type & LK_IPV4_ONLY
+ ? HOST_FIND_BY_MX | HOST_FIND_IPV4_ONLY
+ : lookup_type & LK_IPV4_PREFER
+ ? HOST_FIND_BY_MX | HOST_FIND_IPV4_FIRST
+ : HOST_FIND_BY_MX;
+
DEBUG(D_route|D_host_lookup)
debug_printf("doing DNS MX lookup for %s\n", h->name);
+ mx = MX_NONE;
h->name = string_copyn(h->name, len - 3);
rc = host_find_bydns(h,
ignore_target_hosts,
- HOST_FIND_BY_MX, /* look only for MX records */
- NULL, /* SRV service not relevant */
- NULL, /* failing srv domains not relevant */
- NULL, /* no special mx failing domains */
- NULL, /* fully_qualified_name */
- NULL); /* indicate local host removed */
+ whichrrs, /* look only for MX records */
+ NULL, /* SRV service not relevant */
+ NULL, /* failing srv domains not relevant */
+ NULL, /* no special mx failing domains */
+ &rblock->dnssec, /* dnssec request/require */
+ NULL, /* fully_qualified_name */
+ NULL); /* indicate local host removed */
}
/* If explicitly configured to look up by name, or if the "host name" is
actually an IP address, do a byname lookup. */
- else if (lookup_type == lk_byname || string_is_ip_address(h->name, NULL) != 0)
+ else if (lookup_type & LK_BYNAME || string_is_ip_address(h->name, NULL) != 0)
{
DEBUG(D_route|D_host_lookup) debug_printf("calling host_find_byname\n");
rc = host_find_byname(h, ignore_target_hosts, HOST_FIND_QUALIFY_SINGLE,
else
{
BOOL removed;
+ int whichrrs = lookup_type & LK_IPV4_ONLY
+ ? HOST_FIND_BY_A
+ : lookup_type & LK_IPV4_PREFER
+ ? HOST_FIND_BY_A | HOST_FIND_BY_AAAA | HOST_FIND_IPV4_FIRST
+ : HOST_FIND_BY_A | HOST_FIND_BY_AAAA;
+
DEBUG(D_route|D_host_lookup) debug_printf("doing DNS lookup\n");
- rc = host_find_bydns(h, ignore_target_hosts, HOST_FIND_BY_A, NULL, NULL,
- NULL, &canonical_name, &removed);
- if (rc == HOST_FOUND)
+ switch (rc = host_find_bydns(h, ignore_target_hosts, whichrrs, NULL,
+ NULL, NULL,
+ &rblock->dnssec, /* domains for request/require */
+ &canonical_name, &removed))
{
- if (removed) setflag(addr, af_local_host_removed);
- }
- else if (rc == HOST_FIND_FAILED)
- {
- if (lookup_type == lk_default)
- {
- DEBUG(D_route|D_host_lookup)
- debug_printf("DNS lookup failed: trying getipnodebyname\n");
- rc = host_find_byname(h, ignore_target_hosts, HOST_FIND_QUALIFY_SINGLE,
- &canonical_name, TRUE);
- }
+ case HOST_FOUND:
+ if (removed) setflag(addr, af_local_host_removed);
+ break;
+ case HOST_FIND_FAILED:
+ if (lookup_type & LK_DEFAULT)
+ {
+ DEBUG(D_route|D_host_lookup)
+ debug_printf("DNS lookup failed: trying %s\n",
+ f.running_in_test_harness
+ ? "host_fake_gethostbyname" : "getipnodebyname");
+ rc = host_find_byname(h, ignore_target_hosts, HOST_FIND_QUALIFY_SINGLE,
+ &canonical_name, TRUE);
+ }
+ break;
}
}
/* Temporary failure defers, unless pass_on_timeout is set */
+ if (rc == HOST_FIND_SECURITY)
+ {
+ addr->message = string_sprintf("host lookup for %s done insecurely" , h->name);
+ addr->basic_errno = ERRNO_DNSDEFER;
+ return DEFER;
+ }
if (rc == HOST_FIND_AGAIN)
{
if (rblock->pass_on_timeout)
if (hff_code == hff_pass) return PASS;
if (hff_code == hff_decline) return DECLINE;
+ addr->basic_errno = ERRNO_UNKNOWNHOST;
addr->message =
string_sprintf("lookup of host \"%s\" failed in %s router%s",
h->name, rblock->name,
- host_find_failed_syntax? ": syntax error in name" : "");
+ f.host_find_failed_syntax? ": syntax error in name" : "");
if (hff_code == hff_defer) return DEFER;
if (hff_code == hff_fail) return FAIL;
return DEFER;
}
- /* Deal with a port setting */
+ /* Deal with the settings that were previously cleared:
+ port, mx and sort_key. */
if (port != PORT_NONE)
- {
- host_item *hh;
- for (hh = h; hh != next_h; hh = hh->next) hh->port = port;
- }
+ for (host_item * hh = h; hh != next_h; hh = hh->next)
+ hh->port = port;
+
+ if (mx != MX_NONE)
+ for (host_item * hh = h; hh != next_h; hh = hh->next)
+ {
+ hh->mx = mx;
+ hh->sort_key = sort_key;
+ }
/* A local host gets chopped, with its successors, if there are previous
hosts. Otherwise the self option is used. If it is set to "send", any
if (rc == HOST_FOUND_LOCAL && !self_send)
{
- if (prev != NULL)
+ if (prev)
{
DEBUG(D_route)
{
debug_printf("Removed from host list:\n");
- for (; h != NULL; h = h->next) debug_printf(" %s\n", h->name);
+ for (; h; h = h->next) debug_printf(" %s\n", h->name);
}
prev->next = NULL;
setflag(addr, af_local_host_removed);
projects / exim.git / blobdiff