-/* $Cambridge: exim/src/src/smtp_in.c,v 1.36 2006/03/08 10:49:18 ph10 Exp $ */
+/* $Cambridge: exim/src/src/smtp_in.c,v 1.38 2006/04/19 10:58:21 ph10 Exp $ */
/*************************************************
* Exim - an Internet mail transport agent *
return FALSE;
}
- /* Test with TCP Wrappers if so configured */
+ /* Test with TCP Wrappers if so configured. There is a problem in that
+ hosts_ctl() returns 0 (deny) under a number of system failure circumstances,
+ such as disks dying. In these cases, it is desirable to reject with a 4xx
+ error instead of a 5xx error. There isn't a "right" way to detect such
+ problems. The following kludge is used: errno is zeroed before calling
+ hosts_ctl(). If the result is "reject", a 5xx error is given only if the
+ value of errno is 0 or ENOENT (which happens if /etc/hosts.{allow,deny} does
+ not exist). */
#ifdef USE_TCP_WRAPPERS
+ errno = 0;
if (!hosts_ctl("exim",
(sender_host_name == NULL)? STRING_UNKNOWN : CS sender_host_name,
(sender_host_address == NULL)? STRING_UNKNOWN : CS sender_host_address,
(sender_ident == NULL)? STRING_UNKNOWN : CS sender_ident))
{
- HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
- log_write(L_connection_reject,
- LOG_MAIN|LOG_REJECT, "refused connection from %s "
- "(tcp wrappers)", host_and_ident(FALSE));
- smtp_printf("554 SMTP service not available\r\n");
+ if (errno == 0 || errno == ENOENT)
+ {
+ HDEBUG(D_receive) debug_printf("tcp wrappers rejection\n");
+ log_write(L_connection_reject,
+ LOG_MAIN|LOG_REJECT, "refused connection from %s "
+ "(tcp wrappers)", host_and_ident(FALSE));
+ smtp_printf("554 SMTP service not available\r\n");
+ }
+ else
+ {
+ int save_errno = errno;
+ HDEBUG(D_receive) debug_printf("tcp wrappers rejected with unexpected "
+ "errno value %d\n", save_errno);
+ log_write(L_connection_reject,
+ LOG_MAIN|LOG_REJECT, "temporarily refused connection from %s "
+ "(tcp wrappers errno=%d)", host_and_ident(FALSE), save_errno);
+ smtp_printf("451 Temporary local problem - please try later\r\n");
+ }
return FALSE;
}
#endif
break;
case DEFER:
- s = (addr->message != NULL)?
- string_sprintf("451 <%s> %s", address, addr->message) :
+ s = (addr->user_message != NULL)?
+ string_sprintf("451 <%s> %s", address, addr->user_message) :
string_sprintf("451 Cannot resolve <%s> at this time", address);
break;
case FAIL:
- s = (addr->message != NULL)?
- string_sprintf("550 <%s> %s", address, addr->message) :
+ s = (addr->user_message != NULL)?
+ string_sprintf("550 <%s> %s", address, addr->user_message) :
string_sprintf("550 <%s> is not deliverable", address);
log_write(0, LOG_MAIN, "VRFY failed for %s %s",
smtp_cmd_argument, host_and_ident(TRUE));