Exim forces a lookup if the domain in the HELO is a local domain.
(see spec.txt) This causes deliveries to fail from our
dialup machines under the domain of the host, since our ISP does
not support reverse lookups on the dynamic addresses assigned to
dialup machines (these are 192.168.*.* addresses). This patch to
host.c in the exim source translates IP's 192.168.*.* to host
names 192.168.*.*.local.domain.
Can this be made an option? - like:
auto_reverse_ip = 192.168.0.0/16
or perhaps:
never_reverse_lookup_ips = 192.168.0.0/16
(note that in my case, security is not an issue since the whole
network is firewalled in. Also:
LOCALDOMAIN = my.local.domain
192\.168\.([^.]*)\.([^.]*) --> \2.\1.LOCALDOMAIN
is probably better)
many thanks
-paul
--- host.c.orig Wed Dec 8 11:57:05 1999
+++ host.c Sun Mar 5 12:57:17 2000
@@ -1085,6 +1085,25 @@
hosts = gethostbyaddr((char *)(&addr), sizeof(addr), AF_INET);
#endif
+
+#define ADDRESS_192_168 "192.168."
+#define ADD_LOCAL_DOMAIN ".local.domain"
+/* Paul Sheer <psheer@???> Fri Mar 3 20:34:19 2000 */
+/* don't break on 192.168.*.* address - never do a reverse lookup */
+if (hosts == NULL && sender_host_address != NULL)
+ if (!strncmp (sender_host_address, ADDRESS_192_168, strlen (ADDRESS_192_168))) {
+ addr.s_addr = (S_ADDR_TYPE)inet_addr(sender_host_address);
+ hosts = gethostbyaddr((char *)(&addr), sizeof(addr), AF_INET);
+ if (hosts == NULL) {
+ sender_host_name = store_malloc(strlen (sender_host_address) + strlen (ADD_LOCAL_DOMAIN) + 1);
+ strcpy (sender_host_name, sender_host_address);
+ strcat (sender_host_name, ADD_LOCAL_DOMAIN);
+ sender_host_aliases = NULL;
+ return TRUE;
+ }
+ }
+
+
/* Failed to look up the host. NB host_lookup_msg must be in permant store. */
if (hosts == NULL)
--
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