X-Git-Url: https://git.exim.org/users/heiko/exim.git/blobdiff_plain/ea47e03b7c3232f2b5008298af3f26439a55c7c1..ff57314ec0e6f83302fb2644ca16928322ff62a1:/doc/doc-docbook/spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index a35fbc7d2..31767bf55 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -8263,10 +8263,13 @@ apply to temporary DNS errors, whose handling is described in the next section.
 
 .cindex "&`+include_unknown`&"
 .cindex "&`+ignore_unknown`&"
-By default, Exim behaves as if the host does not match the list. This may not
-always be what you want to happen. To change Exim's behaviour, the special
-items &`+include_unknown`& or &`+ignore_unknown`& may appear in the list (at
-top level &-- they are not recognized in an indirected file).
+Exim parses a host list from left to right. If it encounters a permanent
+lookup failure in any item in the host list before it has found a match,
+Exim treats it as a failure and the default behavior is as if the host
+does not match the list. This may not always be what you want to happen.
+To change Exim's behaviour, the special items &`+include_unknown`& or
+&`+ignore_unknown`& may appear in the list (at top level &-- they are
+not recognized in an indirected file).
 
 .ilist
 If any item that follows &`+include_unknown`& requires information that
@@ -8294,6 +8297,37 @@ Both &`+include_unknown`& and &`+ignore_unknown`& may appear in the same
 list. The effect of each one lasts until the next, or until the end of the
 list.
 
+To explain the host/ip processing logic a different way for the same ACL:
+
+.ilist
+If you have name lookups or wildcarded host names and
+IP addresses in the same host list, you should normally put the IP
+addresses first. For example, in an ACL you could have:
+.code
+accept hosts = 10.9.8.7 : *.friend.example
+.endd
+The reason you normally would order it this way lies in the
+left-to-right way that Exim processes lists.  It can test IP addresses
+without doing any DNS lookups, but when it reaches an item that requires
+a host name, it fails if it cannot find a host name to compare with the
+pattern. If the above list is given in the opposite order, the
+&%accept%& statement fails for a host whose name cannot be found, even
+if its IP address is 10.9.8.7.
+
+.next
+If you really do want to do the name check first, and still recognize the IP
+address, you can rewrite the ACL like this:
+.code
+accept hosts = *.friend.example
+accept hosts = 10.9.8.7
+.endd
+If the first &%accept%& fails, Exim goes on to try the second one. See chapter
+&<<CHAPACL>>& for details of ACLs. Alternatively, you can use
+&`+ignore_unknown`&, which was discussed in depth in the first example in
+this section.
+.endlist
+
+
 
 .section "Temporary DNS errors when looking up host information" &&&
          "SECTtemdnserr"
@@ -15342,6 +15376,13 @@ live with.
 
 . Allow this long option name to split; give it unsplit as a fifth argument
 . for the automatic .oindex that is generated by .option.
+. We insert " &~&~" which is both pretty nasty visually and results in
+. non-searchable text.  HowItWorks.txt mentions an option for inserting
+. zero-width-space, which would be nicer visually and results in (at least)
+. html that Firefox will split on when it's forced to reflow (rather than
+. inserting a horizontal scrollbar).  However, the text is still not
+. searchable.  NM changed this occurrence for bug 1197 to no longer allow
+. the option name to split.
 
 .option "smtp_accept_max_per_connection" main integer 1000 &&&
          smtp_accept_max_per_connection
@@ -15393,10 +15434,9 @@ also &%queue_only%&, &%queue_only_load%&, &%queue_smtp_domains%&, and the
 various &%-od%&&'x'& command line options.
 
 
-. Allow this long option name to split; give it unsplit as a fifth argument
-. for the automatic .oindex that is generated by .option.
+. See the comment on smtp_accept_max_per_connection
 
-.option "smtp_accept_queue_per_ &~&~connection" main integer 10 &&&
+.option "smtp_accept_queue_per_connection" main integer 10 &&&
          smtp_accept_queue_per_connection
 .cindex "queueing incoming messages"
 .cindex "message" "queueing by message count"
@@ -23570,7 +23610,7 @@ In practice, almost all rules start with a domain name pattern without a local
 part.
 
 .cindex "regular expressions" "in retry rules"
-&*Warning*&: If you use a regular expression in a routing rule pattern, it
+&*Warning*&: If you use a regular expression in a retry rule pattern, it
 must match a complete address, not just a domain, because that is how regular
 expressions work in address lists.
 .display