-/* $Cambridge: exim/src/src/host.c,v 1.21 2006/02/07 16:36:25 ph10 Exp $ */
+/* $Cambridge: exim/src/src/host.c,v 1.28 2007/01/08 10:50:18 ph10 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2006 */
+/* Copyright (c) University of Cambridge 1995 - 2007 */
/* See the file NOTICE for conditions of use and distribution. */
/* Functions for finding hosts, either by gethostbyname(), gethostbyaddr(), or
-/*************************************************
-* Sort addresses when testing *
-*************************************************/
-
-/* This function is called only when running in the test harness. It sorts a
-number of multihomed host IP addresses into the order, so as to get
-repeatability. This doesn't have to be efficient. But don't interchange IPv4
-and IPv6 addresses!
-
-NOTE:
-This sorting is not necessary for the new test harness, because it
-doesn't call the real DNS resolver, and its output is repeatable. However,
-until the old test harness is discarded, we need to retain this capability.
-The new harness is being developed towards the end of 2005. It will be some
-time before it can do everything that the old one can do.
-
-Arguments:
- host -> the first host item
- last -> the last host item
-
-Returns: nothing
-*/
-
-static void
-sort_addresses(host_item *host, host_item *last)
-{
-BOOL done = FALSE;
-while (!done)
- {
- host_item *h;
- done = TRUE;
- for (h = host; h != last; h = h->next)
- {
- if ((Ustrchr(h->address, ':') == NULL) !=
- (Ustrchr(h->next->address, ':') == NULL))
- continue;
- if (Ustrcmp(h->address, h->next->address) > 0)
- {
- uschar *temp = h->address;
- h->address = h->next->address;
- h->next->address = temp;
- done = FALSE;
- }
- }
- }
-}
-
-
-
/*************************************************
* Replace gethostbyname() when testing *
*************************************************/
"manyhome.test.ex" and generates a humungous number of IP addresses. It also
recognizes an unqualified "localhost" and forces it to the appropriate loopback
address. IP addresses are treated as literals. For other names, it uses the DNS
-to find the host name. In the new test harness, this means it will access only
-the fake DNS resolver. In the old harness it will call the real resolver and
-access the test zone.
+to find the host name. In the test harness, this means it will access only the
+fake DNS resolver.
Arguments:
name the host name or a textual IP address
return FAIL;
}
-/* We have a host name. If we are running in the test harness, we want the host
-name and its alias to appear always the same way round. There are only ever two
-names in these tests. If one of them contains "alias", make sure it is second;
-otherwise put them in alphabetical order. */
-
-if (running_in_test_harness && *sender_host_aliases != NULL &&
- (
- Ustrstr(sender_host_name, "alias") != NULL ||
- (
- Ustrstr(*sender_host_aliases, "alias") == NULL &&
- Ustrcmp(sender_host_name, *sender_host_aliases) > 0
- )
- ))
- {
- uschar *temp = sender_host_name;
- sender_host_name = *sender_host_aliases;
- *sender_host_aliases = temp;
- }
-
-/* Debug output what was found, after test harness swapping, for consistency */
-
HDEBUG(D_host_lookup)
{
uschar **aliases = sender_host_aliases;
h.mx = MX_NONE;
h.address = NULL;
- /* When called with the 5th argument FALSE, host_find_byname() won't return
+ /* When called with the last argument FALSE, host_find_byname() won't return
HOST_FOUND_LOCAL. If the incoming address is an IPv4 address expressed in
IPv6 format, we must compare the IPv4 part to any IPv4 addresses. */
- if ((rc = host_find_byname(&h, NULL, NULL, FALSE)) == HOST_FOUND)
+ if ((rc = host_find_byname(&h, NULL, 0, NULL, FALSE)) == HOST_FOUND)
{
host_item *hh;
HDEBUG(D_host_lookup) debug_printf("checking addresses for %s\n", hname);
{
HDEBUG(D_host_lookup) debug_printf("temporary error for host name lookup\n");
host_lookup_deferred = TRUE;
+ sender_host_name = NULL;
return DEFER;
}
else
*************************************************/
/* The input is a host_item structure with the name filled in and the address
-field set to NULL. We use gethostbyname(). Of course, gethostbyname() may use
-the DNS, but it doesn't do MX processing. If more than one address is given,
-chain on additional host items, with other relevant fields copied.
+field set to NULL. We use gethostbyname() or getipnodebyname() or
+gethostbyname2(), as appropriate. Of course, these functions may use the DNS,
+but they do not do MX processing. It appears, however, that in some systems the
+current setting of resolver options is used when one of these functions calls
+the resolver. For this reason, we call dns_init() at the start, with arguments
+influenced by bits in "flags", just as we do for host_find_bydns().
The second argument provides a host list (usually an IP list) of hosts to
ignore. This makes it possible to ignore IPv6 link-local addresses or loopback
multiple IP addresses cause other host items to be
chained on.
ignore_target_hosts a list of hosts to ignore
+ flags HOST_FIND_QUALIFY_SINGLE ) passed to
+ HOST_FIND_SEARCH_PARENTS ) dns_init()
fully_qualified_name if not NULL, set to point to host name for
compatibility with host_find_bydns
local_host_check TRUE if a check for the local host is wanted
*/
int
-host_find_byname(host_item *host, uschar *ignore_target_hosts,
+host_find_byname(host_item *host, uschar *ignore_target_hosts, int flags,
uschar **fully_qualified_name, BOOL local_host_check)
{
int i, yield, times;
#endif
/* If we are in the test harness, a name ending in .test.again.dns always
-forces a temporary error response. */
+forces a temporary error response, unless the name is in
+dns_again_means_nonexist. */
if (running_in_test_harness)
{
uschar *endname = host->name + Ustrlen(host->name);
- if (Ustrcmp(endname - 14, "test.again.dns") == 0)
- return HOST_FIND_AGAIN;
+ if (Ustrcmp(endname - 14, "test.again.dns") == 0) goto RETURN_AGAIN;
}
+/* Make sure DNS options are set as required. This appears to be necessary in
+some circumstances when the get..byname() function actually calls the DNS. */
+
+dns_init((flags & HOST_FIND_QUALIFY_SINGLE) != 0,
+ (flags & HOST_FIND_SEARCH_PARENTS) != 0);
+
/* In an IPv6 world, unless IPv6 has been disabled, we need to scan for both
kinds of address, so go round the loop twice. Note that we have ensured that
AF_INET6 is defined even in an IPv4 world, which makes for slightly tidier
lookups here (except when testing standalone). */
#if HAVE_IPV6
- #ifndef STAND_ALONE
- if (disable_ipv6 || (dns_ipv4_lookup != NULL &&
+ #ifdef STAND_ALONE
+ if (disable_ipv6)
+ #else
+ if (disable_ipv6 ||
+ (dns_ipv4_lookup != NULL &&
match_isinlist(host->name, &dns_ipv4_lookup, 0, NULL, NULL, MCL_DOMAIN,
TRUE, NULL) == OK))
+ #endif
+
{ af = AF_INET; times = 1; }
else
- #endif /* STAND_ALONE */
-
{ af = AF_INET6; times = 2; }
/* No IPv6 support */
i++)
{
BOOL ipv4_addr;
- int error_num;
+ int error_num = 0;
struct hostent *hostdata;
+ #ifdef STAND_ALONE
+ printf("Looking up: %s\n", host->name);
+ #endif
+
#if HAVE_IPV6
if (running_in_test_harness)
hostdata = host_fake_gethostbyname(host->name, af, &error_num);
string_sprintf("no IP address found for host %s", host->name);
HDEBUG(D_host_lookup) debug_printf("%s\n", msg);
- if (temp_error) return HOST_FIND_AGAIN;
+ if (temp_error) goto RETURN_AGAIN;
if (host_checking || !log_testing_mode)
log_write(L_host_lookup_failed, LOG_MAIN, "%s", msg);
return HOST_FIND_FAILED;
yield = local_host_check?
host_scan_for_local_hosts(host, &last, NULL) : HOST_FOUND;
-/* When running in the test harness, sort into the order of addresses so as to
-get repeatability. */
-
-if (running_in_test_harness) sort_addresses(host, last);
-
HDEBUG(D_host_lookup)
{
host_item *h;
/* Return the found status. */
return yield;
+
+/* Handle the case when there is a temporary error. If the name matches
+dns_again_means_nonexist, return permanent rather than temporary failure. */
+
+RETURN_AGAIN:
+ {
+ #ifndef STAND_ALONE
+ int rc;
+ uschar *save = deliver_domain;
+ deliver_domain = host->name; /* set $domain */
+ rc = match_isinlist(host->name, &dns_again_means_nonexist, 0, NULL, NULL,
+ MCL_DOMAIN, TRUE, NULL);
+ deliver_domain = save;
+ if (rc == OK)
+ {
+ DEBUG(D_host_lookup) debug_printf("%s is in dns_again_means_nonexist: "
+ "returning HOST_FIND_FAILED\n", host->name);
+ return HOST_FIND_FAILED;
+ }
+ #endif
+ return HOST_FIND_AGAIN;
+ }
}
else
if (rc == HOST_IGNORED) rc = HOST_FIND_FAILED; /* No special action */
- /* When running in the test harness, sort into the order of addresses so as
- to get repeatability. */
-
- if (running_in_test_harness) sort_addresses(host, last);
-
DEBUG(D_host_lookup)
{
host_item *h;
addresses of a multihomed host, but that should not matter. */
#if HAVE_IPV6
-if (h != last)
+if (h != last && !disable_ipv6)
{
for (h = host; h != last; h = h->next)
{
host_item temp;
host_item *next = h->next;
- if (h->mx != next->mx || /* If next is different MX value */
- (h->sort_key % 1000) < 500 || /* OR this one is IPv6 */
- (next->sort_key % 1000) >= 500) /* OR next is IPv4 */
- continue; /* move on to next */
- temp = *h;
+ if (h->mx != next->mx || /* If next is different MX */
+ h->address == NULL || /* OR this one is unset */
+ Ustrchr(h->address, ':') != NULL || /* OR this one is IPv6 */
+ (next->address != NULL &&
+ Ustrchr(next->address, ':') == NULL)) /* OR next is IPv4 */
+ continue; /* move on to next */
+ temp = *h; /* otherwise, swap */
temp.next = next->next;
*h = *next;
h->next = next;
}
#endif
-/* When running in the test harness, we want the hosts always to be in the same
-order so that the debugging output is the same and can be compared. Having a
-fixed set of "random" numbers doesn't actually achieve this, because the RRs
-come back from the resolver in a random order, so the non-random random numbers
-get used in a different order. We therefore have to sort the hosts that have
-the same MX values. We chose do to this by their name and then by IP address.
-The fact that the sort is slow matters not - this is testing only! */
-
-if (running_in_test_harness)
- {
- BOOL done;
- do
- {
- done = TRUE;
- for (h = host; h != last; h = h->next)
- {
- int c = Ustrcmp(h->name, h->next->name);
- if (c == 0) c = Ustrcmp(h->address, h->next->address);
- if (h->mx == h->next->mx && c > 0)
- {
- host_item *next = h->next;
- host_item temp = *h;
- temp.next = next->next;
- *h = *next;
- h->next = next;
- *next = temp;
- done = FALSE;
- }
- }
- }
- while (!done);
- }
-
/* Remove any duplicate IP addresses and then scan the list of hosts for any
whose IP addresses are on the local host. If any are found, all hosts with the
same or higher MX values are removed. However, if the local host has the lowest
uschar **argv = USS cargv;
uschar buffer[256];
+disable_ipv6 = FALSE;
primary_hostname = US"";
store_pool = POOL_MAIN;
debug_selector = D_host_lookup|D_interface;
else if (Ustrcmp(buffer, "no_search_parents") == 0) search_parents = FALSE;
else if (Ustrcmp(buffer, "test_harness") == 0)
running_in_test_harness = !running_in_test_harness;
+ else if (Ustrcmp(buffer, "ipv6") == 0) disable_ipv6 = !disable_ipv6;
else if (Ustrcmp(buffer, "res_debug") == 0)
{
_res.options ^= RES_DEBUG;
if (search_parents) flags |= HOST_FIND_SEARCH_PARENTS;
rc = byname?
- host_find_byname(&h, NULL, &fully_qualified_name, TRUE)
+ host_find_byname(&h, NULL, flags, &fully_qualified_name, TRUE)
:
host_find_bydns(&h, NULL, flags, US"smtp", NULL, NULL,
&fully_qualified_name, NULL);
git://git.exim.org / exim.git / blobdiff